| /* |
| * Copyright 2017-present Open Networking Foundation |
| * |
| * 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.ra; |
| |
| import com.google.common.collect.ImmutableMap; |
| import org.onlab.packet.EthType; |
| import org.onlab.packet.Ethernet; |
| import org.onlab.packet.ICMP6; |
| import org.onlab.packet.IPv6; |
| import org.onlab.packet.Ip6Address; |
| import org.onlab.packet.IpAddress; |
| import org.onlab.packet.MacAddress; |
| import org.onlab.packet.ndp.NeighborDiscoveryOptions; |
| import org.onlab.packet.ndp.RouterAdvertisement; |
| import org.onosproject.cfg.ComponentConfigService; |
| import org.onosproject.core.ApplicationId; |
| import org.onosproject.core.CoreService; |
| import org.onosproject.mastership.MastershipEvent; |
| import org.onosproject.mastership.MastershipListener; |
| import org.onosproject.mastership.MastershipService; |
| import org.onosproject.net.ConnectPoint; |
| import org.onosproject.net.DeviceId; |
| import org.onosproject.net.MastershipRole; |
| import org.onosproject.net.config.ConfigFactory; |
| import org.onosproject.net.config.NetworkConfigEvent; |
| import org.onosproject.net.config.NetworkConfigListener; |
| import org.onosproject.net.config.NetworkConfigRegistry; |
| import org.onosproject.net.config.basics.InterfaceConfig; |
| import org.onosproject.net.config.basics.SubjectFactories; |
| import org.onosproject.net.device.DeviceEvent; |
| import org.onosproject.net.device.DeviceListener; |
| import org.onosproject.net.device.DeviceService; |
| import org.onosproject.net.flow.DefaultTrafficTreatment; |
| import org.onosproject.net.flow.TrafficTreatment; |
| import org.onosproject.net.host.InterfaceIpAddress; |
| import org.onosproject.net.intf.Interface; |
| import org.onosproject.net.intf.InterfaceEvent; |
| import org.onosproject.net.intf.InterfaceListener; |
| import org.onosproject.net.intf.InterfaceService; |
| import org.onosproject.net.packet.DefaultOutboundPacket; |
| import org.onosproject.net.packet.InboundPacket; |
| import org.onosproject.net.packet.OutboundPacket; |
| import org.onosproject.net.packet.PacketContext; |
| import org.onosproject.net.packet.PacketProcessor; |
| import org.onosproject.net.packet.PacketService; |
| import org.onosproject.ra.config.RouterAdvertisementDeviceConfig; |
| import org.osgi.service.component.ComponentContext; |
| import org.osgi.service.component.annotations.Activate; |
| import org.osgi.service.component.annotations.Component; |
| import org.osgi.service.component.annotations.Deactivate; |
| import org.osgi.service.component.annotations.Modified; |
| import org.osgi.service.component.annotations.Reference; |
| import org.osgi.service.component.annotations.ReferenceCardinality; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.annotation.concurrent.GuardedBy; |
| import java.nio.ByteBuffer; |
| import java.util.AbstractMap; |
| import java.util.Arrays; |
| import java.util.Dictionary; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.Set; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.ScheduledFuture; |
| import java.util.concurrent.TimeUnit; |
| import java.util.function.Function; |
| import java.util.stream.IntStream; |
| |
| import static com.google.common.base.Strings.isNullOrEmpty; |
| import static org.onlab.util.Tools.get; |
| import static org.onlab.util.Tools.groupedThreads; |
| |
| /** |
| * Manages IPv6 Router Advertisements. |
| */ |
| @Component(immediate = true, service = RoutingAdvertisementService.class) |
| public class RouterAdvertisementManager implements RoutingAdvertisementService { |
| |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| private static final String PROP_RA_THREADS_POOL = "raPoolSize"; |
| private static final int DEFAULT_RA_THREADS_POOL_SIZE = 10; |
| private static final String PROP_RA_THREADS_DELAY = "raThreadDelay"; |
| private static final int DEFAULT_RA_THREADS_DELAY = 5; |
| private static final String PROP_RA_FLAG_MBIT_STATUS = "raFlagMbitStatus"; |
| private static final boolean DEFAULT_RA_FLAG_MBIT_STATUS = false; |
| private static final String PROP_RA_FLAG_OBIT_STATUS = "raFlagObitStatus"; |
| private static final boolean DEFAULT_RA_FLAG_OBIT_STATUS = false; |
| private static final String PROP_RA_OPTION_PREFIX_STATUS = "raOptionPrefixStatus"; |
| private static final boolean DEFAULT_RA_OPTION_PREFIX_STATUS = false; |
| private static final String PROP_RA_GLOBAL_PREFIX_CONF_STATUS = "raGlobalPrefixConfStatus"; |
| private static final boolean DEFAULT_RA_GLOBAL_PREFIX_CONF_STATUS = true; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected CoreService coreService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| PacketService packetService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected ComponentConfigService componentConfigService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| public InterfaceService interfaceService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| public MastershipService mastershipService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected NetworkConfigRegistry networkConfigRegistry; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected DeviceService deviceService; |
| |
| //@Property(name = PROP_RA_THREADS_POOL, intValue = DEFAULT_RA_THREADS_POOL_SIZE, |
| // label = "Thread pool capacity") |
| protected int raPoolSize = DEFAULT_RA_THREADS_POOL_SIZE; |
| |
| //@Property(name = PROP_RA_THREADS_DELAY, intValue = DEFAULT_RA_THREADS_DELAY, |
| // label = "Thread delay in seconds") |
| protected int raThreadDelay = DEFAULT_RA_THREADS_DELAY; |
| |
| //@Property(name = PROP_RA_FLAG_MBIT_STATUS, boolValue = DEFAULT_RA_FLAG_MBIT_STATUS, |
| // label = "Turn M-bit flag on/off") |
| protected boolean raFlagMbitStatus = DEFAULT_RA_FLAG_MBIT_STATUS; |
| |
| //@Property(name = PROP_RA_FLAG_OBIT_STATUS, boolValue = DEFAULT_RA_FLAG_OBIT_STATUS, |
| // label = "Turn O-bit flag on/off") |
| protected boolean raFlagObitStatus = DEFAULT_RA_FLAG_OBIT_STATUS; |
| |
| //@Property(name = PROP_RA_OPTION_PREFIX_STATUS, boolValue = DEFAULT_RA_OPTION_PREFIX_STATUS, |
| // label = "Prefix option support needed or not") |
| protected boolean raOptionPrefixStatus = DEFAULT_RA_OPTION_PREFIX_STATUS; |
| |
| //@Property(name = PROP_RA_GLOBAL_PREFIX_CONF_STATUS, boolValue = DEFAULT_RA_GLOBAL_PREFIX_CONF_STATUS, |
| // label = "Global prefix configuration support on/off") |
| protected boolean raGlobalConfigStatus = DEFAULT_RA_GLOBAL_PREFIX_CONF_STATUS; |
| |
| @GuardedBy(value = "this") |
| private final Map<ConnectPoint, Map.Entry<ScheduledFuture<?>, List<InterfaceIpAddress>>> transmitters = |
| new LinkedHashMap<>(); |
| |
| // TODO: should consider using concurrent variants |
| @GuardedBy(value = "this") |
| private final Map<DeviceId, List<InterfaceIpAddress>> globalPrefixes = new LinkedHashMap<>(); |
| |
| @Override |
| public synchronized ImmutableMap<DeviceId, List<InterfaceIpAddress>> getGlobalPrefixes() { |
| return ImmutableMap.copyOf(globalPrefixes); |
| } |
| |
| @SuppressWarnings("GuardedBy") |
| @GuardedBy(value = "this") |
| private Function<Interface, Map.Entry<ConnectPoint, List<InterfaceIpAddress>>> prefixGenerator = |
| i -> { |
| Map.Entry<ConnectPoint, List<InterfaceIpAddress>> prefixEntry; |
| if (raGlobalConfigStatus && globalPrefixes.containsKey(i.connectPoint().deviceId())) { |
| prefixEntry = new AbstractMap.SimpleEntry<>(i.connectPoint(), |
| globalPrefixes.get(i.connectPoint().deviceId())); |
| } else { |
| prefixEntry = new AbstractMap.SimpleEntry<>(i.connectPoint(), i.ipAddressesList()); |
| } |
| return prefixEntry; |
| }; |
| |
| private ScheduledExecutorService executors = null; |
| |
| private static final String APP_NAME = "org.onosproject.routeradvertisement"; |
| private ApplicationId appId; |
| |
| private final ConfigFactory<DeviceId, RouterAdvertisementDeviceConfig> deviceConfigFactory = |
| new ConfigFactory<DeviceId, RouterAdvertisementDeviceConfig>( |
| SubjectFactories.DEVICE_SUBJECT_FACTORY, |
| RouterAdvertisementDeviceConfig.class, "routeradvertisement") { |
| @Override |
| public RouterAdvertisementDeviceConfig createConfig() { |
| |
| return new RouterAdvertisementDeviceConfig(); |
| } |
| }; |
| |
| // Listener for handling dynamic interface modifications. |
| private class InternalInterfaceListener implements InterfaceListener { |
| @Override |
| public void event(InterfaceEvent event) { |
| switch (event.type()) { |
| case INTERFACE_ADDED: |
| case INTERFACE_UPDATED: |
| clearTxWorkers(); |
| loadGlobalPrefixConfig(); |
| setupTxWorkers(); |
| log.info("Configuration updated for {}", event.subject()); |
| break; |
| case INTERFACE_REMOVED: |
| Interface i = event.subject(); |
| if (mastershipService.getLocalRole(i.connectPoint().deviceId()) |
| == MastershipRole.MASTER) { |
| deactivateRouterAdvertisement(i.connectPoint()); |
| } |
| break; |
| default: |
| } |
| } |
| } |
| |
| private final InterfaceListener interfaceListener = new InternalInterfaceListener(); |
| |
| // Enables RA threads on 'connectPoint' with configured IPv6s |
| private synchronized void activateRouterAdvertisement(ConnectPoint connectPoint, |
| List<InterfaceIpAddress> addresses) { |
| RAWorkerThread worker = new RAWorkerThread(connectPoint, addresses, raThreadDelay, null, null); |
| ScheduledFuture<?> handler = executors.scheduleAtFixedRate(worker, raThreadDelay, |
| raThreadDelay, TimeUnit.SECONDS); |
| transmitters.put(connectPoint, new AbstractMap.SimpleEntry<>(handler, addresses)); |
| } |
| |
| // Disables already activated RA threads on 'connectPoint' |
| private synchronized List<InterfaceIpAddress> deactivateRouterAdvertisement(ConnectPoint connectPoint) { |
| if (connectPoint != null) { |
| Map.Entry<ScheduledFuture<?>, List<InterfaceIpAddress>> details = transmitters.get(connectPoint); |
| details.getKey().cancel(false); |
| transmitters.remove(connectPoint); |
| return details.getValue(); |
| } |
| return null; |
| } |
| |
| private synchronized void setupThreadPool() { |
| executors = Executors.newScheduledThreadPool(raPoolSize, |
| groupedThreads("RouterAdvertisement", "event-%d", log)); |
| } |
| |
| private synchronized void clearThreadPool() { |
| executors.shutdown(); |
| } |
| |
| // Start Tx threads for all configured interfaces. |
| private synchronized void setupTxWorkers() { |
| interfaceService.getInterfaces() |
| .stream() |
| .filter(i -> mastershipService.getLocalRole(i.connectPoint().deviceId()) |
| == MastershipRole.MASTER) |
| .map(prefixGenerator::apply) |
| .filter(i -> i.getValue() |
| .stream() |
| .anyMatch(ia -> ia.ipAddress().version().equals(IpAddress.Version.INET6))) |
| .forEach(j -> |
| activateRouterAdvertisement(j.getKey(), j.getValue()) |
| ); |
| } |
| |
| // Clear out Tx threads. |
| private synchronized void clearTxWorkers() { |
| transmitters.entrySet().stream().forEach(i -> i.getValue().getKey().cancel(false)); |
| transmitters.clear(); |
| } |
| |
| private synchronized void setupPoolAndTxWorkers() { |
| setupThreadPool(); |
| setupTxWorkers(); |
| } |
| |
| private synchronized void clearPoolAndTxWorkers() { |
| clearTxWorkers(); |
| clearThreadPool(); |
| } |
| |
| @SuppressWarnings("GuardedBy") |
| // Loading global prefixes for devices from network configuration |
| private synchronized void loadGlobalPrefixConfig() { |
| globalPrefixes.clear(); |
| Set<DeviceId> deviceSubjects = |
| networkConfigRegistry.getSubjects(DeviceId.class, RouterAdvertisementDeviceConfig.class); |
| deviceSubjects.forEach(subject -> { |
| RouterAdvertisementDeviceConfig config = |
| networkConfigRegistry.getConfig(subject, RouterAdvertisementDeviceConfig.class); |
| if (config != null) { |
| List<InterfaceIpAddress> ips = config.prefixes(); |
| globalPrefixes.put(subject, ips); |
| } |
| }); |
| } |
| |
| // Handler for network configuration updates |
| private class InternalNetworkConfigListener implements NetworkConfigListener { |
| @Override |
| public void event(NetworkConfigEvent event) { |
| if (event.configClass().equals(RouterAdvertisementDeviceConfig.class) |
| || event.configClass().equals(InterfaceConfig.class)) { |
| switch (event.type()) { |
| case CONFIG_ADDED: |
| case CONFIG_UPDATED: |
| clearTxWorkers(); |
| loadGlobalPrefixConfig(); |
| setupTxWorkers(); |
| log.info("Configuration updated for {}", event.subject()); |
| break; |
| default: |
| } |
| } |
| } |
| } |
| |
| private final InternalNetworkConfigListener networkConfigListener |
| = new InternalNetworkConfigListener(); |
| |
| // Handler for device updates |
| private class InternalDeviceListener implements DeviceListener { |
| @Override |
| public void event(DeviceEvent event) { |
| switch (event.type()) { |
| case DEVICE_ADDED: |
| case PORT_UPDATED: |
| case PORT_ADDED: |
| case DEVICE_UPDATED: |
| case DEVICE_AVAILABILITY_CHANGED: |
| clearTxWorkers(); |
| setupTxWorkers(); |
| log.trace("Processed device event {} on {}", event.type(), event.subject()); |
| break; |
| default: |
| } |
| } |
| } |
| |
| private class InternalMastershipListener implements MastershipListener { |
| @Override |
| public void event(MastershipEvent event) { |
| switch (event.type()) { |
| case MASTER_CHANGED: |
| clearTxWorkers(); |
| setupTxWorkers(); |
| log.trace("Processed mastership event {} on {}", event.type(), event.subject()); |
| break; |
| case BACKUPS_CHANGED: |
| case SUSPENDED: |
| default: |
| break; |
| } |
| } |
| } |
| |
| private final InternalDeviceListener internalDeviceListener = new InternalDeviceListener(); |
| private final InternalMastershipListener internalMastershipListener = new InternalMastershipListener(); |
| |
| // Processor for Solicited RA packets |
| private class InternalPacketProcessor implements PacketProcessor { |
| |
| @Override |
| public void process(PacketContext context) { |
| if (context.isHandled()) { |
| return; |
| } |
| |
| // Ensure packet is IPv6 Solicited RA |
| InboundPacket pkt = context.inPacket(); |
| Ethernet ethernet = pkt.parsed(); |
| if ((ethernet == null) || (ethernet.getEtherType() != Ethernet.TYPE_IPV6)) { |
| return; |
| } |
| IPv6 ipv6Packet = (IPv6) ethernet.getPayload(); |
| if (ipv6Packet.getNextHeader() != IPv6.PROTOCOL_ICMP6) { |
| return; |
| } |
| ICMP6 icmp6Packet = (ICMP6) ipv6Packet.getPayload(); |
| if (icmp6Packet.getIcmpType() != ICMP6.ROUTER_SOLICITATION) { |
| return; |
| } |
| |
| // Start solicited-RA handling thread |
| SolicitedRAWorkerThread sraWorkerThread = new SolicitedRAWorkerThread(pkt); |
| executors.schedule(sraWorkerThread, 0, TimeUnit.SECONDS); |
| } |
| } |
| |
| InternalPacketProcessor processor = null; |
| |
| @Activate |
| protected void activate(ComponentContext context) { |
| // Basic application registrations. |
| appId = coreService.registerApplication(APP_NAME); |
| componentConfigService.registerProperties(getClass()); |
| |
| // Packet processor for handling Router Solicitations |
| processor = new InternalPacketProcessor(); |
| packetService.addProcessor(processor, PacketProcessor.director(3)); |
| |
| // Setup global prefix loading components |
| networkConfigRegistry.addListener(networkConfigListener); |
| networkConfigRegistry.registerConfigFactory(deviceConfigFactory); |
| loadGlobalPrefixConfig(); |
| |
| // Register device and mastership event listener |
| deviceService.addListener(internalDeviceListener); |
| mastershipService.addListener(internalMastershipListener); |
| |
| // Setup pool and worker threads for existing interfaces |
| setupPoolAndTxWorkers(); |
| } |
| |
| |
| @Modified |
| protected void modified(ComponentContext context) { |
| int newRaPoolSize, newRaThreadDelay; |
| |
| // Loading configured properties. |
| if (context != null) { |
| Dictionary<?, ?> properties = context.getProperties(); |
| try { |
| // Handle change in pool size |
| String s = get(properties, PROP_RA_THREADS_POOL); |
| newRaPoolSize = isNullOrEmpty(s) ? |
| DEFAULT_RA_THREADS_POOL_SIZE : Integer.parseInt(s.trim()); |
| if (newRaPoolSize != raPoolSize) { |
| raPoolSize = newRaPoolSize; |
| clearPoolAndTxWorkers(); |
| setupPoolAndTxWorkers(); |
| log.info("Thread pool size updated to {}", raPoolSize); |
| } |
| |
| // Handle change in thread delay |
| s = get(properties, PROP_RA_THREADS_DELAY); |
| newRaThreadDelay = isNullOrEmpty(s) ? |
| DEFAULT_RA_THREADS_DELAY : Integer.parseInt(s.trim()); |
| if (newRaThreadDelay != raThreadDelay) { |
| raThreadDelay = newRaThreadDelay; |
| clearTxWorkers(); |
| setupTxWorkers(); |
| log.info("Thread delay updated to {}", raThreadDelay); |
| } |
| |
| // Handle M-flag changes |
| s = get(properties, PROP_RA_FLAG_MBIT_STATUS); |
| if (!isNullOrEmpty(s)) { |
| raFlagMbitStatus = Boolean.parseBoolean(s.trim()); |
| log.info("RA M-flag set {}", s); |
| } |
| |
| // Handle O-flag changes |
| s = get(properties, PROP_RA_FLAG_OBIT_STATUS); |
| if (!isNullOrEmpty(s)) { |
| raFlagObitStatus = Boolean.parseBoolean(s.trim()); |
| log.info("RA O-flag set {}", s); |
| } |
| |
| // Handle prefix option configuration |
| s = get(properties, PROP_RA_OPTION_PREFIX_STATUS); |
| if (!isNullOrEmpty(s)) { |
| raOptionPrefixStatus = Boolean.parseBoolean(s.trim()); |
| String status = raOptionPrefixStatus ? "enabled" : "disabled"; |
| log.info("RA prefix option {}", status); |
| } |
| |
| s = get(properties, PROP_RA_GLOBAL_PREFIX_CONF_STATUS); |
| if (!isNullOrEmpty(s)) { |
| raGlobalConfigStatus = Boolean.parseBoolean(s.trim()); |
| clearTxWorkers(); |
| setupTxWorkers(); |
| String status = raOptionPrefixStatus ? "enabled" : "disabled"; |
| log.info("RA global configuration file loading {}", status); |
| } |
| |
| } catch (NumberFormatException e) { |
| log.warn("Component configuration had invalid value, aborting changes loading.", e); |
| } |
| } |
| } |
| |
| @Deactivate |
| protected void deactivate() { |
| // Unregister resources. |
| componentConfigService.unregisterProperties(getClass(), false); |
| interfaceService.removeListener(interfaceListener); |
| networkConfigRegistry.removeListener(networkConfigListener); |
| networkConfigRegistry.unregisterConfigFactory(deviceConfigFactory); |
| packetService.removeProcessor(processor); |
| deviceService.removeListener(internalDeviceListener); |
| mastershipService.removeListener(internalMastershipListener); |
| |
| // Clear pool & threads |
| clearPoolAndTxWorkers(); |
| } |
| |
| // Worker thread for actually sending ICMPv6 RA packets. |
| private class RAWorkerThread implements Runnable { |
| |
| ConnectPoint connectPoint; |
| List<InterfaceIpAddress> ipAddresses; |
| int retransmitPeriod; |
| MacAddress solicitHostMac; |
| byte[] solicitHostAddress; |
| |
| // Various fixed values in RA packet |
| public static final byte RA_HOP_LIMIT = (byte) 0xff; |
| public static final short RA_ROUTER_LIFETIME = (short) 1800; |
| public static final int RA_OPTIONS_BUFFER_SIZE = 500; |
| public static final int RA_OPTION_MTU_VALUE = 1500; |
| public static final int RA_OPTION_PREFIX_VALID_LIFETIME = 600; |
| public static final int RA_OPTION_PREFIX_PREFERRED_LIFETIME = 600; |
| public static final int RA_RETRANSMIT_CALIBRATION_PERIOD = 1; |
| |
| |
| RAWorkerThread(ConnectPoint connectPoint, List<InterfaceIpAddress> ipAddresses, int period, |
| MacAddress macAddress, byte[] ipv6Address) { |
| this.connectPoint = connectPoint; |
| this.ipAddresses = ipAddresses; |
| retransmitPeriod = period; |
| solicitHostMac = macAddress; |
| solicitHostAddress = ipv6Address; |
| } |
| |
| @Override |
| public void run() { |
| // Router Advertisement header filling. Please refer RFC-2461. |
| RouterAdvertisement ra = new RouterAdvertisement(); |
| ra.setCurrentHopLimit(RA_HOP_LIMIT); |
| ra.setMFlag((byte) (raFlagMbitStatus ? 0x01 : 0x00)); |
| ra.setOFlag((byte) (raFlagObitStatus ? 0x01 : 0x00)); |
| ra.setRouterLifetime(RA_ROUTER_LIFETIME); |
| ra.setReachableTime(0); |
| ra.setRetransmitTimer(retransmitPeriod + RA_RETRANSMIT_CALIBRATION_PERIOD); |
| |
| // Option : Source link-layer address. |
| byte[] optionBuffer = new byte[RA_OPTIONS_BUFFER_SIZE]; |
| ByteBuffer option = ByteBuffer.wrap(optionBuffer); |
| Optional<MacAddress> macAddress = interfaceService.getInterfacesByPort(connectPoint).stream() |
| .map(Interface::mac).findFirst(); |
| if (!macAddress.isPresent()) { |
| log.warn("Unable to retrieve interface {} MAC address. Terminating RA transmission.", connectPoint); |
| return; |
| } |
| option.put(macAddress.get().toBytes()); |
| ra.addOption(NeighborDiscoveryOptions.TYPE_SOURCE_LL_ADDRESS, |
| Arrays.copyOfRange(option.array(), 0, option.position())); |
| |
| // Option : MTU. |
| option.rewind(); |
| option.putShort((short) 0); |
| option.putInt(RA_OPTION_MTU_VALUE); |
| ra.addOption(NeighborDiscoveryOptions.TYPE_MTU, |
| Arrays.copyOfRange(option.array(), 0, option.position())); |
| |
| // Option : Prefix information. |
| if (raOptionPrefixStatus) { |
| ipAddresses.stream() |
| .filter(i -> i.ipAddress().version().equals(IpAddress.Version.INET6)) |
| .forEach(i -> { |
| option.rewind(); |
| option.put((byte) i.subnetAddress().prefixLength()); |
| // Enable "onlink" option only. |
| option.put((byte) 0x80); |
| option.putInt(RA_OPTION_PREFIX_VALID_LIFETIME); |
| option.putInt(RA_OPTION_PREFIX_PREFERRED_LIFETIME); |
| // Clear reserved fields |
| option.putInt(0x00000000); |
| option.put(IpAddress.makeMaskedAddress(i.ipAddress(), |
| i.subnetAddress().prefixLength()).toOctets()); |
| ra.addOption(NeighborDiscoveryOptions.TYPE_PREFIX_INFORMATION, |
| Arrays.copyOfRange(option.array(), 0, option.position())); |
| |
| }); |
| } |
| |
| // ICMPv6 header filling. |
| ICMP6 icmpv6 = new ICMP6(); |
| icmpv6.setIcmpType(ICMP6.ROUTER_ADVERTISEMENT); |
| icmpv6.setIcmpCode((byte) 0); |
| icmpv6.setPayload(ra); |
| |
| // IPv6 header filling. |
| byte[] ip6AllNodesAddress = Ip6Address.valueOf("ff02::1").toOctets(); |
| IPv6 ipv6 = new IPv6(); |
| ipv6.setDestinationAddress((solicitHostAddress == null) ? ip6AllNodesAddress : solicitHostAddress); |
| /* RA packet L2 source address created from port MAC address. |
| * Note : As per RFC-4861 RAs should be sent from link-local address. |
| */ |
| ipv6.setSourceAddress(IPv6.getLinkLocalAddress(macAddress.get().toBytes())); |
| ipv6.setNextHeader(IPv6.PROTOCOL_ICMP6); |
| ipv6.setHopLimit(RA_HOP_LIMIT); |
| ipv6.setTrafficClass((byte) 0xe0); |
| ipv6.setPayload(icmpv6); |
| |
| // Ethernet header filling. |
| Ethernet ethernet = new Ethernet(); |
| |
| /* Ethernet IPv6 multicast address creation. |
| * Refer : RFC 2624 section 7. |
| */ |
| byte[] l2Ipv6MulticastAddress = MacAddress.IPV6_MULTICAST.toBytes(); |
| IntStream.range(1, 4).forEach(i -> l2Ipv6MulticastAddress[l2Ipv6MulticastAddress.length - i] = |
| ip6AllNodesAddress[ip6AllNodesAddress.length - i]); |
| // Provide unicast address for Solicit RA replays |
| ethernet.setDestinationMACAddress((solicitHostMac == null) ? |
| MacAddress.valueOf(l2Ipv6MulticastAddress) : solicitHostMac); |
| ethernet.setSourceMACAddress(macAddress.get().toBytes()); |
| ethernet.setEtherType(EthType.EtherType.IPV6.ethType().toShort()); |
| ethernet.setVlanID(Ethernet.VLAN_UNTAGGED); |
| ethernet.setPayload(ipv6); |
| ethernet.setPad(false); |
| |
| // Flush out PACKET_OUT. |
| ByteBuffer stream = ByteBuffer.wrap(ethernet.serialize()); |
| TrafficTreatment treatment = DefaultTrafficTreatment.builder().setOutput(connectPoint.port()).build(); |
| OutboundPacket packet = new DefaultOutboundPacket(connectPoint.deviceId(), |
| treatment, stream); |
| packetService.emit(packet); |
| log.trace("Transmitted Unsolicited Router Advertisement on {}", connectPoint); |
| } |
| } |
| |
| // Worker thread for processing IPv6 Solicited RA packets. |
| public class SolicitedRAWorkerThread implements Runnable { |
| |
| private InboundPacket packet; |
| |
| SolicitedRAWorkerThread(InboundPacket packet) { |
| this.packet = packet; |
| } |
| |
| @Override |
| public void run() { |
| |
| // TODO : Validate Router Solicitation |
| |
| // Pause already running unsolicited RA threads in received connect point |
| ConnectPoint connectPoint = packet.receivedFrom(); |
| List<InterfaceIpAddress> addresses = deactivateRouterAdvertisement(connectPoint); |
| |
| /* Multicast RA(ie. Unsolicited RA) TX time is not preciously tracked so to make sure that |
| * Unicast RA(ie. Router Solicitation Response) is TXed before Mulicast RA |
| * logic adapted here is disable Mulicast RA, TX Unicast RA and then restore Multicast RA. |
| */ |
| log.trace("Processing Router Solicitations from {}", connectPoint); |
| try { |
| Ethernet ethernet = packet.parsed(); |
| IPv6 ipv6 = (IPv6) ethernet.getPayload(); |
| RAWorkerThread worker = new RAWorkerThread(connectPoint, |
| addresses, raThreadDelay, ethernet.getSourceMAC(), ipv6.getSourceAddress()); |
| // TODO : Estimate TX time as in RFC 4861, Section 6.2.6 and schedule TX based on it |
| CompletableFuture<Void> sraHandlerFuture = CompletableFuture.runAsync(worker, executors); |
| sraHandlerFuture.get(); |
| } catch (Exception e) { |
| log.error("Failed to respond to router solicitation. {}", e); |
| } finally { |
| activateRouterAdvertisement(connectPoint, addresses); |
| log.trace("Restored Unsolicited Router Advertisements on {}", connectPoint); |
| } |
| } |
| } |
| |
| } |