Charles Chan | c91c878 | 2016-03-30 17:54:24 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016-present Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.segmentrouting; |
| 18 | |
| 19 | import com.google.common.collect.ImmutableSet; |
| 20 | import com.google.common.collect.Lists; |
| 21 | import com.google.common.collect.Sets; |
| 22 | import org.onlab.packet.Ethernet; |
| 23 | import org.onlab.packet.IpAddress; |
| 24 | import org.onlab.packet.IpPrefix; |
| 25 | import org.onlab.packet.MacAddress; |
| 26 | import org.onlab.packet.VlanId; |
| 27 | import org.onlab.util.KryoNamespace; |
| 28 | import org.onosproject.core.ApplicationId; |
| 29 | import org.onosproject.core.CoreService; |
| 30 | import org.onosproject.incubator.net.config.basics.McastConfig; |
| 31 | import org.onosproject.net.ConnectPoint; |
| 32 | import org.onosproject.net.DeviceId; |
| 33 | import org.onosproject.net.Link; |
| 34 | import org.onosproject.net.Path; |
| 35 | import org.onosproject.net.PortNumber; |
| 36 | import org.onosproject.net.flow.DefaultTrafficSelector; |
| 37 | import org.onosproject.net.flow.DefaultTrafficTreatment; |
| 38 | import org.onosproject.net.flow.TrafficSelector; |
| 39 | import org.onosproject.net.flow.TrafficTreatment; |
| 40 | import org.onosproject.net.flow.criteria.Criteria; |
| 41 | import org.onosproject.net.flow.instructions.Instructions.OutputInstruction; |
| 42 | import org.onosproject.net.flowobjective.DefaultFilteringObjective; |
| 43 | import org.onosproject.net.flowobjective.DefaultForwardingObjective; |
| 44 | import org.onosproject.net.flowobjective.DefaultNextObjective; |
| 45 | import org.onosproject.net.flowobjective.FilteringObjective; |
| 46 | import org.onosproject.net.flowobjective.ForwardingObjective; |
| 47 | import org.onosproject.net.flowobjective.NextObjective; |
| 48 | import org.onosproject.net.mcast.McastEvent; |
| 49 | import org.onosproject.net.mcast.McastRouteInfo; |
| 50 | import org.onosproject.net.topology.TopologyService; |
Charles Chan | 1eaf480 | 2016-04-18 13:44:03 -0700 | [diff] [blame^] | 51 | import org.onosproject.segmentrouting.storekey.McastNextObjectiveStoreKey; |
Charles Chan | c91c878 | 2016-03-30 17:54:24 -0700 | [diff] [blame] | 52 | import org.onosproject.store.serializers.KryoNamespaces; |
| 53 | import org.onosproject.store.service.ConsistentMap; |
| 54 | import org.onosproject.store.service.Serializer; |
| 55 | import org.onosproject.store.service.StorageService; |
| 56 | import org.slf4j.Logger; |
| 57 | import org.slf4j.LoggerFactory; |
| 58 | |
| 59 | import java.util.Collection; |
| 60 | import java.util.Collections; |
| 61 | import java.util.List; |
| 62 | import java.util.Optional; |
| 63 | import java.util.Set; |
| 64 | |
| 65 | /** |
Charles Chan | 1eaf480 | 2016-04-18 13:44:03 -0700 | [diff] [blame^] | 66 | * Handles multicast-related events. |
Charles Chan | c91c878 | 2016-03-30 17:54:24 -0700 | [diff] [blame] | 67 | */ |
Charles Chan | 1eaf480 | 2016-04-18 13:44:03 -0700 | [diff] [blame^] | 68 | public class McastHandler { |
| 69 | private static final Logger log = LoggerFactory.getLogger(McastHandler.class); |
Charles Chan | c91c878 | 2016-03-30 17:54:24 -0700 | [diff] [blame] | 70 | private final SegmentRoutingManager srManager; |
| 71 | private final ApplicationId coreAppId; |
| 72 | private StorageService storageService; |
| 73 | private TopologyService topologyService; |
| 74 | private final KryoNamespace.Builder kryoBuilder; |
| 75 | private final ConsistentMap<McastNextObjectiveStoreKey, NextObjective> mcastNextObjStore; |
| 76 | |
| 77 | /** |
| 78 | * Constructs the McastEventHandler. |
| 79 | * |
| 80 | * @param srManager Segment Routing manager |
| 81 | */ |
Charles Chan | 1eaf480 | 2016-04-18 13:44:03 -0700 | [diff] [blame^] | 82 | public McastHandler(SegmentRoutingManager srManager) { |
Charles Chan | c91c878 | 2016-03-30 17:54:24 -0700 | [diff] [blame] | 83 | coreAppId = srManager.coreService.getAppId(CoreService.CORE_APP_NAME); |
| 84 | |
| 85 | this.srManager = srManager; |
| 86 | this.storageService = srManager.storageService; |
| 87 | this.topologyService = srManager.topologyService; |
| 88 | |
| 89 | kryoBuilder = new KryoNamespace.Builder() |
| 90 | .register(KryoNamespaces.API) |
| 91 | .register(McastNextObjectiveStoreKey.class); |
| 92 | mcastNextObjStore = storageService |
| 93 | .<McastNextObjectiveStoreKey, NextObjective>consistentMapBuilder() |
| 94 | .withName("onos-mcast-nextobj-store") |
| 95 | .withSerializer(Serializer.using(kryoBuilder.build())) |
| 96 | .build(); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Processes the SOURCE_ADDED event. |
| 101 | * |
| 102 | * @param event McastEvent with SOURCE_ADDED type |
| 103 | */ |
| 104 | protected void processSourceAdded(McastEvent event) { |
| 105 | log.info("processSourceAdded {}", event); |
| 106 | McastRouteInfo mcastRouteInfo = event.subject(); |
| 107 | if (!mcastRouteInfo.isComplete()) { |
| 108 | log.info("Incompleted McastRouteInfo. Abort."); |
| 109 | return; |
| 110 | } |
| 111 | ConnectPoint source = mcastRouteInfo.source().orElse(null); |
| 112 | Set<ConnectPoint> sinks = mcastRouteInfo.sinks(); |
| 113 | IpAddress mcastIp = mcastRouteInfo.route().group(); |
| 114 | |
| 115 | sinks.forEach(sink -> { |
| 116 | processSinkAddedInternal(source, sink, mcastIp); |
| 117 | }); |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * Processes the SINK_ADDED event. |
| 122 | * |
| 123 | * @param event McastEvent with SINK_ADDED type |
| 124 | */ |
| 125 | protected void processSinkAdded(McastEvent event) { |
| 126 | log.info("processSinkAdded {}", event); |
| 127 | McastRouteInfo mcastRouteInfo = event.subject(); |
| 128 | if (!mcastRouteInfo.isComplete()) { |
| 129 | log.info("Incompleted McastRouteInfo. Abort."); |
| 130 | return; |
| 131 | } |
| 132 | ConnectPoint source = mcastRouteInfo.source().orElse(null); |
| 133 | ConnectPoint sink = mcastRouteInfo.sink().orElse(null); |
| 134 | IpAddress mcastIp = mcastRouteInfo.route().group(); |
| 135 | |
| 136 | processSinkAddedInternal(source, sink, mcastIp); |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Processes the SINK_REMOVED event. |
| 141 | * |
| 142 | * @param event McastEvent with SINK_REMOVED type |
| 143 | */ |
| 144 | protected void processSinkRemoved(McastEvent event) { |
| 145 | log.info("processSinkRemoved {}", event); |
| 146 | McastRouteInfo mcastRouteInfo = event.subject(); |
| 147 | if (!mcastRouteInfo.isComplete()) { |
| 148 | log.info("Incompleted McastRouteInfo. Abort."); |
| 149 | return; |
| 150 | } |
| 151 | ConnectPoint source = mcastRouteInfo.source().orElse(null); |
| 152 | ConnectPoint sink = mcastRouteInfo.sink().orElse(null); |
| 153 | IpAddress mcastIp = mcastRouteInfo.route().group(); |
| 154 | VlanId assignedVlan = assignedVlan(); |
| 155 | |
| 156 | // When source and sink are on the same device |
| 157 | if (source.deviceId().equals(sink.deviceId())) { |
| 158 | // Source and sink are on even the same port. There must be something wrong. |
| 159 | if (source.port().equals(sink.port())) { |
| 160 | log.warn("Sink is on the same port of source. Abort"); |
| 161 | return; |
| 162 | } |
| 163 | removePortFromDevice(sink.deviceId(), sink.port(), mcastIp, assignedVlan); |
| 164 | return; |
| 165 | } |
| 166 | |
| 167 | // Process the egress device |
| 168 | boolean isLast = removePortFromDevice(sink.deviceId(), sink.port(), mcastIp, assignedVlan); |
| 169 | |
| 170 | // If this is the last sink on the device, also update upstream |
| 171 | Optional<Path> mcastPath = getPath(source.deviceId(), sink.deviceId(), mcastIp); |
| 172 | if (mcastPath.isPresent()) { |
| 173 | List<Link> links = Lists.newArrayList(mcastPath.get().links()); |
| 174 | Collections.reverse(links); |
| 175 | for (Link link : links) { |
| 176 | if (isLast) { |
| 177 | isLast = removePortFromDevice(link.src().deviceId(), link.src().port(), |
| 178 | mcastIp, assignedVlan); |
| 179 | } |
| 180 | } |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Establishes a path from source to sink for given multicast group. |
| 186 | * |
| 187 | * @param source connect point of the multicast source |
| 188 | * @param sink connection point of the multicast sink |
| 189 | * @param mcastIp multicast group IP address |
| 190 | */ |
| 191 | private void processSinkAddedInternal(ConnectPoint source, ConnectPoint sink, |
| 192 | IpAddress mcastIp) { |
| 193 | VlanId assignedVlan = assignedVlan(); |
| 194 | |
| 195 | // When source and sink are on the same device |
| 196 | if (source.deviceId().equals(sink.deviceId())) { |
| 197 | // Source and sink are on even the same port. There must be something wrong. |
| 198 | if (source.port().equals(sink.port())) { |
| 199 | log.warn("Sink is on the same port of source. Abort"); |
| 200 | return; |
| 201 | } |
| 202 | addPortToDevice(sink.deviceId(), sink.port(), mcastIp, assignedVlan); |
| 203 | return; |
| 204 | } |
| 205 | |
| 206 | // Process the ingress device |
| 207 | addFilterToDevice(source.deviceId(), source.port(), assignedVlan); |
| 208 | |
| 209 | // Find a path. If present, create/update groups and flows for each hop |
| 210 | Optional<Path> mcastPath = getPath(source.deviceId(), sink.deviceId(), mcastIp); |
| 211 | if (mcastPath.isPresent()) { |
| 212 | mcastPath.get().links().forEach(link -> { |
| 213 | addFilterToDevice(link.dst().deviceId(), link.dst().port(), assignedVlan); |
| 214 | addPortToDevice(link.src().deviceId(), link.src().port(), mcastIp, assignedVlan); |
| 215 | }); |
| 216 | // Process the egress device |
| 217 | addPortToDevice(sink.deviceId(), sink.port(), mcastIp, assignedVlan); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Adds filtering objective for given device and port. |
| 223 | * |
| 224 | * @param deviceId device ID |
| 225 | * @param port ingress port number |
| 226 | * @param assignedVlan assigned VLAN ID |
| 227 | */ |
| 228 | private void addFilterToDevice(DeviceId deviceId, PortNumber port, VlanId assignedVlan) { |
| 229 | // Do nothing if the port is configured as suppressed |
| 230 | ConnectPoint connectPt = new ConnectPoint(deviceId, port); |
| 231 | if (srManager.deviceConfiguration.suppressSubnet().contains(connectPt) || |
| 232 | srManager.deviceConfiguration.suppressHost().contains(connectPt)) { |
| 233 | log.info("Ignore suppressed port {}", connectPt); |
| 234 | return; |
| 235 | } |
| 236 | |
| 237 | FilteringObjective.Builder filtObjBuilder = |
| 238 | filterObjBuilder(deviceId, port, assignedVlan); |
| 239 | srManager.flowObjectiveService.filter(deviceId, filtObjBuilder.add()); |
| 240 | // TODO add objective context |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * Adds a port to given multicast group on given device. This involves the |
| 245 | * update of L3 multicast group and multicast routing table entry. |
| 246 | * |
| 247 | * @param deviceId device ID |
| 248 | * @param port port to be added |
| 249 | * @param mcastIp multicast group |
| 250 | * @param assignedVlan assigned VLAN ID |
| 251 | */ |
| 252 | private void addPortToDevice(DeviceId deviceId, PortNumber port, |
| 253 | IpAddress mcastIp, VlanId assignedVlan) { |
| 254 | log.info("Add port {} to {}. mcastIp={}, assignedVlan={}", |
| 255 | port, deviceId, mcastIp, assignedVlan); |
| 256 | McastNextObjectiveStoreKey mcastNextObjectiveStoreKey = |
| 257 | new McastNextObjectiveStoreKey(mcastIp, deviceId); |
| 258 | ImmutableSet.Builder<PortNumber> portBuilder = ImmutableSet.builder(); |
| 259 | if (!mcastNextObjStore.containsKey(mcastNextObjectiveStoreKey)) { |
| 260 | // First time someone request this mcast group via this device |
| 261 | portBuilder.add(port); |
| 262 | } else { |
| 263 | // This device already serves some subscribers of this mcast group |
| 264 | NextObjective nextObj = mcastNextObjStore.get(mcastNextObjectiveStoreKey).value(); |
| 265 | // Stop if the port is already in the nextobj |
| 266 | Set<PortNumber> existingPorts = getPorts(nextObj.next()); |
| 267 | if (existingPorts.contains(port)) { |
| 268 | log.info("NextObj for {}/{} already exists. Abort", deviceId, port); |
| 269 | return; |
| 270 | } |
| 271 | portBuilder.addAll(existingPorts).add(port).build(); |
| 272 | } |
| 273 | // Create, store and apply the new nextObj and fwdObj |
| 274 | NextObjective newNextObj = |
| 275 | nextObjBuilder(mcastIp, assignedVlan, portBuilder.build()).add(); |
| 276 | ForwardingObjective fwdObj = |
| 277 | fwdObjBuilder(mcastIp, assignedVlan, newNextObj.id()).add(); |
| 278 | mcastNextObjStore.put(mcastNextObjectiveStoreKey, newNextObj); |
| 279 | srManager.flowObjectiveService.next(deviceId, newNextObj); |
| 280 | srManager.flowObjectiveService.forward(deviceId, fwdObj); |
| 281 | // TODO add objective callback |
| 282 | } |
| 283 | |
| 284 | /** |
| 285 | * Removes a port from given multicast group on given device. |
| 286 | * This involves the update of L3 multicast group and multicast routing |
| 287 | * table entry. |
| 288 | * |
| 289 | * @param deviceId device ID |
| 290 | * @param port port to be added |
| 291 | * @param mcastIp multicast group |
| 292 | * @param assignedVlan assigned VLAN ID |
| 293 | * @return true if this is the last sink on this device |
| 294 | */ |
| 295 | private boolean removePortFromDevice(DeviceId deviceId, PortNumber port, |
| 296 | IpAddress mcastIp, VlanId assignedVlan) { |
| 297 | log.info("Remove port {} from {}. mcastIp={}, assignedVlan={}", |
| 298 | port, deviceId, mcastIp, assignedVlan); |
| 299 | McastNextObjectiveStoreKey mcastNextObjectiveStoreKey = |
| 300 | new McastNextObjectiveStoreKey(mcastIp, deviceId); |
| 301 | // This device is not serving this multicast group |
| 302 | if (!mcastNextObjStore.containsKey(mcastNextObjectiveStoreKey)) { |
| 303 | log.warn("{} is not serving {} on port {}. Abort.", deviceId, mcastIp, port); |
| 304 | return false; |
| 305 | } |
| 306 | NextObjective nextObj = mcastNextObjStore.get(mcastNextObjectiveStoreKey).value(); |
| 307 | |
| 308 | Set<PortNumber> existingPorts = getPorts(nextObj.next()); |
| 309 | // This device does not serve this multicast group |
| 310 | if (!existingPorts.contains(port)) { |
| 311 | log.warn("{} is not serving {} on port {}. Abort.", deviceId, mcastIp, port); |
| 312 | return false; |
| 313 | } |
| 314 | // Copy and modify the ImmutableSet |
| 315 | existingPorts = Sets.newHashSet(existingPorts); |
| 316 | existingPorts.remove(port); |
| 317 | |
| 318 | NextObjective newNextObj; |
| 319 | ForwardingObjective fwdObj; |
| 320 | if (existingPorts.isEmpty()) { |
| 321 | // If this is the last sink, remove flows and groups |
| 322 | // NOTE: Rely on GroupStore garbage collection rather than explicitly |
| 323 | // remove L3MG since there might be other flows/groups refer to |
| 324 | // the same L2IG |
| 325 | fwdObj = fwdObjBuilder(mcastIp, assignedVlan, nextObj.id()).remove(); |
| 326 | mcastNextObjStore.remove(mcastNextObjectiveStoreKey); |
| 327 | srManager.flowObjectiveService.forward(deviceId, fwdObj); |
| 328 | } else { |
| 329 | // If this is not the last sink, update flows and groups |
| 330 | newNextObj = nextObjBuilder(mcastIp, assignedVlan, existingPorts).add(); |
| 331 | fwdObj = fwdObjBuilder(mcastIp, assignedVlan, newNextObj.id()).add(); |
| 332 | mcastNextObjStore.put(mcastNextObjectiveStoreKey, newNextObj); |
| 333 | srManager.flowObjectiveService.next(deviceId, newNextObj); |
| 334 | srManager.flowObjectiveService.forward(deviceId, fwdObj); |
| 335 | } |
| 336 | // TODO add objective callback |
| 337 | |
| 338 | return existingPorts.isEmpty(); |
| 339 | } |
| 340 | |
| 341 | /** |
| 342 | * Creates a next objective builder for multicast. |
| 343 | * |
| 344 | * @param mcastIp multicast group |
| 345 | * @param assignedVlan assigned VLAN ID |
| 346 | * @param outPorts set of output port numbers |
| 347 | * @return next objective builder |
| 348 | */ |
| 349 | private NextObjective.Builder nextObjBuilder(IpAddress mcastIp, |
| 350 | VlanId assignedVlan, Set<PortNumber> outPorts) { |
| 351 | int nextId = srManager.flowObjectiveService.allocateNextId(); |
| 352 | |
| 353 | TrafficSelector metadata = |
| 354 | DefaultTrafficSelector.builder() |
| 355 | .matchVlanId(assignedVlan) |
| 356 | .matchIPDst(mcastIp.toIpPrefix()) |
| 357 | .build(); |
| 358 | |
| 359 | NextObjective.Builder nextObjBuilder = DefaultNextObjective |
| 360 | .builder().withId(nextId) |
| 361 | .withType(NextObjective.Type.BROADCAST).fromApp(srManager.appId) |
| 362 | .withMeta(metadata); |
| 363 | |
| 364 | outPorts.forEach(port -> { |
| 365 | TrafficTreatment.Builder tBuilder = DefaultTrafficTreatment.builder(); |
| 366 | if (egressVlan().equals(VlanId.NONE)) { |
| 367 | tBuilder.popVlan(); |
| 368 | } |
| 369 | tBuilder.setOutput(port); |
| 370 | nextObjBuilder.addTreatment(tBuilder.build()); |
| 371 | }); |
| 372 | |
| 373 | return nextObjBuilder; |
| 374 | } |
| 375 | |
| 376 | /** |
| 377 | * Creates a forwarding objective builder for multicast. |
| 378 | * |
| 379 | * @param mcastIp multicast group |
| 380 | * @param assignedVlan assigned VLAN ID |
| 381 | * @param nextId next ID of the L3 multicast group |
| 382 | * @return forwarding objective builder |
| 383 | */ |
| 384 | private ForwardingObjective.Builder fwdObjBuilder(IpAddress mcastIp, |
| 385 | VlanId assignedVlan, int nextId) { |
| 386 | TrafficSelector.Builder sbuilder = DefaultTrafficSelector.builder(); |
| 387 | IpPrefix mcastPrefix = IpPrefix.valueOf(mcastIp, IpPrefix.MAX_INET_MASK_LENGTH); |
| 388 | sbuilder.matchEthType(Ethernet.TYPE_IPV4); |
| 389 | sbuilder.matchIPDst(mcastPrefix); |
| 390 | TrafficSelector.Builder metabuilder = DefaultTrafficSelector.builder(); |
| 391 | metabuilder.matchVlanId(assignedVlan); |
| 392 | |
| 393 | ForwardingObjective.Builder fwdBuilder = DefaultForwardingObjective.builder(); |
| 394 | fwdBuilder.withSelector(sbuilder.build()) |
| 395 | .withMeta(metabuilder.build()) |
| 396 | .nextStep(nextId) |
| 397 | .withFlag(ForwardingObjective.Flag.SPECIFIC) |
| 398 | .fromApp(srManager.appId) |
| 399 | .withPriority(SegmentRoutingService.DEFAULT_PRIORITY); |
| 400 | return fwdBuilder; |
| 401 | } |
| 402 | |
| 403 | /** |
| 404 | * Creates a filtering objective builder for multicast. |
| 405 | * |
| 406 | * @param deviceId Device ID |
| 407 | * @param ingressPort ingress port of the multicast stream |
| 408 | * @param assignedVlan assigned VLAN ID |
| 409 | * @return filtering objective builder |
| 410 | */ |
| 411 | private FilteringObjective.Builder filterObjBuilder(DeviceId deviceId, PortNumber ingressPort, |
| 412 | VlanId assignedVlan) { |
| 413 | FilteringObjective.Builder filtBuilder = DefaultFilteringObjective.builder(); |
| 414 | filtBuilder.withKey(Criteria.matchInPort(ingressPort)) |
| 415 | .addCondition(Criteria.matchEthDstMasked(MacAddress.IPV4_MULTICAST, |
| 416 | MacAddress.IPV4_MULTICAST_MASK)) |
| 417 | .addCondition(Criteria.matchVlanId(egressVlan())) |
| 418 | .withPriority(SegmentRoutingService.DEFAULT_PRIORITY); |
| 419 | // vlan assignment is valid only if this instance is master |
| 420 | if (srManager.mastershipService.isLocalMaster(deviceId)) { |
| 421 | TrafficTreatment tt = DefaultTrafficTreatment.builder() |
| 422 | .pushVlan().setVlanId(assignedVlan).build(); |
| 423 | filtBuilder.withMeta(tt); |
| 424 | } |
| 425 | return filtBuilder.permit().fromApp(srManager.appId); |
| 426 | } |
| 427 | |
| 428 | /** |
| 429 | * Gets output ports information from treatments. |
| 430 | * |
| 431 | * @param treatments collection of traffic treatments |
| 432 | * @return set of output port numbers |
| 433 | */ |
| 434 | private Set<PortNumber> getPorts(Collection<TrafficTreatment> treatments) { |
| 435 | ImmutableSet.Builder<PortNumber> builder = ImmutableSet.builder(); |
| 436 | treatments.forEach(treatment -> { |
| 437 | treatment.allInstructions().stream() |
| 438 | .filter(instr -> instr instanceof OutputInstruction) |
| 439 | .forEach(instr -> { |
| 440 | builder.add(((OutputInstruction) instr).port()); |
| 441 | }); |
| 442 | }); |
| 443 | return builder.build(); |
| 444 | } |
| 445 | |
| 446 | /** |
| 447 | * Gets a path from src to dst. |
| 448 | * If a path was allocated before, returns the allocated path. |
| 449 | * Otherwise, randomly pick one from available paths. |
| 450 | * |
| 451 | * @param src source device ID |
| 452 | * @param dst destination device ID |
| 453 | * @param mcastIp multicast group |
| 454 | * @return an optional path from src to dst |
| 455 | */ |
| 456 | private Optional<Path> getPath(DeviceId src, DeviceId dst, IpAddress mcastIp) { |
| 457 | List<Path> allPaths = Lists.newArrayList( |
| 458 | topologyService.getPaths(topologyService.currentTopology(), src, dst)); |
| 459 | if (allPaths.isEmpty()) { |
| 460 | log.warn("Fail to find a path from {} to {}. Abort.", src, dst); |
| 461 | return Optional.empty(); |
| 462 | } |
| 463 | |
| 464 | // If one of the available path is used before, use the same path |
| 465 | McastNextObjectiveStoreKey mcastNextObjectiveStoreKey = |
| 466 | new McastNextObjectiveStoreKey(mcastIp, src); |
| 467 | if (mcastNextObjStore.containsKey(mcastNextObjectiveStoreKey)) { |
| 468 | NextObjective nextObj = mcastNextObjStore.get(mcastNextObjectiveStoreKey).value(); |
| 469 | Set<PortNumber> existingPorts = getPorts(nextObj.next()); |
| 470 | for (Path path : allPaths) { |
| 471 | PortNumber srcPort = path.links().get(0).src().port(); |
| 472 | if (existingPorts.contains(srcPort)) { |
| 473 | return Optional.of(path); |
| 474 | } |
| 475 | } |
| 476 | } |
| 477 | // Otherwise, randomly pick a path |
| 478 | Collections.shuffle(allPaths); |
| 479 | return allPaths.stream().findFirst(); |
| 480 | } |
| 481 | |
| 482 | /** |
| 483 | * Gets egress VLAN from McastConfig. |
| 484 | * |
| 485 | * @return egress VLAN or VlanId.NONE if not configured |
| 486 | */ |
| 487 | private VlanId egressVlan() { |
| 488 | McastConfig mcastConfig = |
| 489 | srManager.cfgService.getConfig(coreAppId, McastConfig.class); |
| 490 | return (mcastConfig != null) ? mcastConfig.egressVlan() : VlanId.NONE; |
| 491 | } |
| 492 | |
| 493 | /** |
| 494 | * Gets assigned VLAN according to the value of egress VLAN. |
| 495 | * |
| 496 | * @return assigned VLAN |
| 497 | */ |
| 498 | private VlanId assignedVlan() { |
| 499 | return (egressVlan().equals(VlanId.NONE)) ? |
| 500 | VlanId.vlanId(SegmentRoutingManager.ASSIGNED_VLAN_NO_SUBNET) : |
| 501 | egressVlan(); |
| 502 | } |
| 503 | } |