| /* |
| * 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.opencord.dhcpl2relay.impl; |
| |
| import com.google.common.collect.ImmutableSet; |
| import com.google.common.collect.Lists; |
| import com.google.common.collect.Maps; |
| import com.google.common.collect.Sets; |
| import org.onlab.packet.DHCP; |
| import org.onlab.packet.Ethernet; |
| import org.onlab.packet.IPv4; |
| import org.onlab.packet.IpAddress; |
| import org.onlab.packet.MacAddress; |
| import org.onlab.packet.TpPort; |
| import org.onlab.packet.UDP; |
| import org.onlab.packet.VlanId; |
| import org.onlab.packet.dhcp.DhcpOption; |
| import org.onlab.util.Tools; |
| import org.onosproject.cfg.ComponentConfigService; |
| import org.onosproject.core.ApplicationId; |
| import org.onosproject.core.CoreService; |
| import org.onosproject.event.AbstractListenerManager; |
| import org.onosproject.mastership.MastershipEvent; |
| import org.onosproject.mastership.MastershipListener; |
| import org.onosproject.mastership.MastershipService; |
| import org.onosproject.net.AnnotationKeys; |
| import org.onosproject.net.ConnectPoint; |
| import org.onosproject.net.Device; |
| import org.onosproject.net.DeviceId; |
| import org.onosproject.net.Host; |
| import org.onosproject.net.Port; |
| import org.onosproject.net.PortNumber; |
| 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.device.DeviceEvent; |
| import org.onosproject.net.device.DeviceListener; |
| import org.onosproject.net.device.DeviceService; |
| 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.flowobjective.FlowObjectiveService; |
| import org.onosproject.net.host.HostService; |
| import org.onosproject.net.packet.DefaultOutboundPacket; |
| import org.onosproject.net.packet.OutboundPacket; |
| import org.onosproject.net.packet.PacketContext; |
| import org.onosproject.net.packet.PacketPriority; |
| import org.onosproject.net.packet.PacketProcessor; |
| import org.onosproject.net.packet.PacketService; |
| import org.opencord.dhcpl2relay.DhcpAllocationInfo; |
| import org.opencord.dhcpl2relay.DhcpL2RelayEvent; |
| import org.opencord.dhcpl2relay.DhcpL2RelayListener; |
| import org.opencord.dhcpl2relay.DhcpL2RelayService; |
| import org.opencord.dhcpl2relay.impl.packet.DhcpOption82; |
| import org.opencord.sadis.BaseInformationService; |
| import org.opencord.sadis.SadisService; |
| import org.opencord.sadis.SubscriberAndDeviceInformation; |
| 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 java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Dictionary; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.Set; |
| import java.util.concurrent.atomic.AtomicReference; |
| import java.util.stream.Collectors; |
| |
| import static org.onlab.packet.DHCP.DHCPOptionCode.OptionCode_MessageType; |
| import static org.onlab.packet.MacAddress.valueOf; |
| import static org.onosproject.net.config.basics.SubjectFactories.APP_SUBJECT_FACTORY; |
| import static org.opencord.dhcpl2relay.impl.OsgiPropertyConstants.ENABLE_DHCP_BROADCAST_REPLIES; |
| import static org.opencord.dhcpl2relay.impl.OsgiPropertyConstants.ENABLE_DHCP_BROADCAST_REPLIES_DEFAULT; |
| import static org.opencord.dhcpl2relay.impl.OsgiPropertyConstants.OPTION_82; |
| import static org.opencord.dhcpl2relay.impl.OsgiPropertyConstants.OPTION_82_DEFAULT; |
| |
| /** |
| * DHCP Relay Agent Application Component. |
| */ |
| @Component(immediate = true, |
| property = { |
| OPTION_82 + ":Boolean=" + OPTION_82_DEFAULT, |
| ENABLE_DHCP_BROADCAST_REPLIES + ":Boolean=" + ENABLE_DHCP_BROADCAST_REPLIES_DEFAULT, |
| }) |
| public class DhcpL2Relay |
| extends AbstractListenerManager<DhcpL2RelayEvent, DhcpL2RelayListener> |
| implements DhcpL2RelayService { |
| |
| public static final String DHCP_L2RELAY_APP = "org.opencord.dhcpl2relay"; |
| private static final String HOST_LOC_PROVIDER = |
| "org.onosproject.provider.host.impl.HostLocationProvider"; |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| private final InternalConfigListener cfgListener = |
| new InternalConfigListener(); |
| |
| private final Set<ConfigFactory> factories = ImmutableSet.of( |
| new ConfigFactory<ApplicationId, DhcpL2RelayConfig>(APP_SUBJECT_FACTORY, |
| DhcpL2RelayConfig.class, |
| "dhcpl2relay") { |
| @Override |
| public DhcpL2RelayConfig createConfig() { |
| return new DhcpL2RelayConfig(); |
| } |
| } |
| ); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected NetworkConfigRegistry cfgService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected CoreService coreService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected PacketService packetService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected HostService hostService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected ComponentConfigService componentConfigService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected SadisService sadisService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected DeviceService deviceService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected MastershipService mastershipService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected FlowObjectiveService flowObjectiveService; |
| |
| /** Add option 82 to relayed packets */ |
| protected boolean option82 = OPTION_82_DEFAULT; |
| |
| /** Ask the DHCP Server to send back replies as L2 broadcast */ |
| protected boolean enableDhcpBroadcastReplies = ENABLE_DHCP_BROADCAST_REPLIES_DEFAULT; |
| |
| private DhcpRelayPacketProcessor dhcpRelayPacketProcessor = |
| new DhcpRelayPacketProcessor(); |
| |
| private InnerMastershipListener changeListener = new InnerMastershipListener(); |
| private InnerDeviceListener deviceListener = new InnerDeviceListener(); |
| |
| // connect points to the DHCP server |
| Set<ConnectPoint> dhcpConnectPoints; |
| private AtomicReference<ConnectPoint> dhcpServerConnectPoint = new AtomicReference<>(); |
| private MacAddress dhcpConnectMac = MacAddress.BROADCAST; |
| private ApplicationId appId; |
| |
| static Map<String, DhcpAllocationInfo> allocationMap = Maps.newConcurrentMap(); |
| private boolean modifyClientPktsSrcDstMac = false; |
| //Whether to use the uplink port of the OLTs to send/receive messages to the DHCP server |
| private boolean useOltUplink = false; |
| |
| private BaseInformationService<SubscriberAndDeviceInformation> subsService; |
| |
| @Activate |
| protected void activate(ComponentContext context) { |
| //start the dhcp relay agent |
| appId = coreService.registerApplication(DHCP_L2RELAY_APP); |
| // ensure that host-learning via dhcp includes IP addresses |
| componentConfigService.preSetProperty(HOST_LOC_PROVIDER, |
| "useDhcp", Boolean.TRUE.toString()); |
| componentConfigService.registerProperties(getClass()); |
| eventDispatcher.addSink(DhcpL2RelayEvent.class, listenerRegistry); |
| |
| cfgService.addListener(cfgListener); |
| mastershipService.addListener(changeListener); |
| deviceService.addListener(deviceListener); |
| |
| factories.forEach(cfgService::registerConfigFactory); |
| //update the dhcp server configuration. |
| updateConfig(); |
| //add the packet services. |
| packetService.addProcessor(dhcpRelayPacketProcessor, |
| PacketProcessor.director(0)); |
| if (context != null) { |
| modified(context); |
| } |
| |
| subsService = sadisService.getSubscriberInfoService(); |
| |
| log.info("DHCP-L2-RELAY Started"); |
| } |
| |
| @Deactivate |
| protected void deactivate() { |
| cfgService.removeListener(cfgListener); |
| factories.forEach(cfgService::unregisterConfigFactory); |
| packetService.removeProcessor(dhcpRelayPacketProcessor); |
| cancelDhcpPktsFromServer(); |
| |
| componentConfigService.unregisterProperties(getClass(), false); |
| deviceService.removeListener(deviceListener); |
| mastershipService.removeListener(changeListener); |
| eventDispatcher.removeSink(DhcpL2RelayEvent.class); |
| log.info("DHCP-L2-RELAY Stopped"); |
| } |
| |
| @Modified |
| protected void modified(ComponentContext context) { |
| |
| Dictionary<?, ?> properties = context.getProperties(); |
| |
| Boolean o = Tools.isPropertyEnabled(properties, OPTION_82); |
| if (o != null) { |
| option82 = o; |
| } |
| |
| o = Tools.isPropertyEnabled(properties, ENABLE_DHCP_BROADCAST_REPLIES); |
| if (o != null) { |
| enableDhcpBroadcastReplies = o; |
| } |
| } |
| |
| /** |
| * Checks if this app has been configured. |
| * |
| * @return true if all information we need have been initialized |
| */ |
| private boolean configured() { |
| if (!useOltUplink) { |
| return dhcpServerConnectPoint.get() != null; |
| } |
| return true; |
| } |
| |
| /** |
| * Selects a connect point through an available device for which it is the master. |
| */ |
| private void selectServerConnectPoint() { |
| synchronized (this) { |
| dhcpServerConnectPoint.set(null); |
| if (dhcpConnectPoints != null) { |
| // find a connect point through a device for which we are master |
| for (ConnectPoint cp: dhcpConnectPoints) { |
| if (mastershipService.isLocalMaster(cp.deviceId())) { |
| if (deviceService.isAvailable(cp.deviceId())) { |
| dhcpServerConnectPoint.set(cp); |
| } |
| log.info("DHCP connectPoint selected is {}", cp); |
| break; |
| } |
| } |
| } |
| |
| log.info("DHCP Server connectPoint is {}", dhcpServerConnectPoint.get()); |
| |
| if (dhcpServerConnectPoint.get() == null) { |
| log.error("Master of none, can't relay DHCP Message to server"); |
| } |
| } |
| } |
| |
| /** |
| * Updates the network configuration. |
| */ |
| private void updateConfig() { |
| DhcpL2RelayConfig cfg = cfgService.getConfig(appId, DhcpL2RelayConfig.class); |
| if (cfg == null) { |
| log.warn("Dhcp Server info not available"); |
| return; |
| } |
| |
| dhcpConnectPoints = Sets.newConcurrentHashSet(cfg.getDhcpServerConnectPoint()); |
| modifyClientPktsSrcDstMac = cfg.getModifySrcDstMacAddresses(); |
| boolean prevUseOltUplink = useOltUplink; |
| useOltUplink = cfg.getUseOltUplinkForServerPktInOut(); |
| |
| if (useOltUplink) { |
| for (ConnectPoint cp : getUplinkPortsOfOlts()) { |
| log.debug("requestDhcpPackets: ConnectPoint: {}", cp); |
| requestDhcpPacketsFromConnectPoint(cp, null); |
| } |
| // check if previous config was different and so trap flows may |
| // need to be removed from other places like AGG switches |
| if (!prevUseOltUplink) { |
| addOrRemoveDhcpTrapFromServer(false); |
| } |
| } else { |
| // uplink on AGG switch |
| addOrRemoveDhcpTrapFromServer(true); |
| } |
| } |
| |
| private void cancelDhcpPktsFromServer() { |
| if (useOltUplink) { |
| for (ConnectPoint cp : getUplinkPortsOfOlts()) { |
| log.debug("cancelDhcpPackets: ConnectPoint: {}", cp); |
| cancelDhcpPacketsFromConnectPoint(cp, null); |
| } |
| } else { |
| // uplink on AGG switch |
| addOrRemoveDhcpTrapFromServer(false); |
| } |
| } |
| |
| /** |
| * Used to add or remove DHCP trap flow for packets received from DHCP server. |
| * Typically used on a non OLT device, like an AGG switch. When adding, a |
| * new dhcp server connect point is selected from the configured options. |
| * |
| * @param add true if dhcp trap flow is to be added, false to remove the |
| * trap flow |
| */ |
| private void addOrRemoveDhcpTrapFromServer(boolean add) { |
| if (add) { |
| selectServerConnectPoint(); |
| log.debug("dhcp server connect point: " + dhcpServerConnectPoint); |
| } |
| if (dhcpServerConnectPoint.get() == null) { |
| log.warn("No dhcpServer connectPoint found, cannot {} dhcp trap flows", |
| (add) ? "install" : "remove"); |
| return; |
| } |
| if (add) { |
| log.info("Adding trap to dhcp server connect point: " |
| + dhcpServerConnectPoint); |
| requestDhcpPacketsFromConnectPoint(dhcpServerConnectPoint.get(), |
| Optional.of(PacketPriority.HIGH1)); |
| } else { |
| log.info("Removing trap from dhcp server connect point: " |
| + dhcpServerConnectPoint); |
| cancelDhcpPacketsFromConnectPoint(dhcpServerConnectPoint.get(), |
| Optional.of(PacketPriority.HIGH1)); |
| } |
| } |
| |
| /** |
| * Returns all the uplink ports of OLTs configured in SADIS. |
| * Only ports visible in ONOS and for which this instance is master |
| * are returned |
| */ |
| private List<ConnectPoint> getUplinkPortsOfOlts() { |
| List<ConnectPoint> cps = new ArrayList<>(); |
| |
| // find all the olt devices and if their uplink ports are visible |
| Iterable<Device> devices = deviceService.getDevices(); |
| for (Device d : devices) { |
| // check if this device is provisioned in Sadis |
| |
| log.debug("getUplinkPortsOfOlts: Checking mastership of {}", d); |
| // do only for devices for which we are the master |
| if (!mastershipService.isLocalMaster(d.id())) { |
| continue; |
| } |
| |
| String devSerialNo = d.serialNumber(); |
| SubscriberAndDeviceInformation deviceInfo = subsService.get(devSerialNo); |
| log.debug("getUplinkPortsOfOlts: Found device: {}", deviceInfo); |
| if (deviceInfo != null) { |
| // check if the uplink port with that number is available on the device |
| PortNumber pNum = PortNumber.portNumber(deviceInfo.uplinkPort()); |
| Port port = deviceService.getPort(d.id(), pNum); |
| log.debug("getUplinkPortsOfOlts: Found port: {}", port); |
| if (port != null) { |
| cps.add(new ConnectPoint(d.id(), pNum)); |
| } |
| } |
| } |
| return cps; |
| } |
| |
| /** |
| * Returns whether the passed port is the uplink port of the olt device. |
| */ |
| private boolean isUplinkPortOfOlt(DeviceId dId, Port p) { |
| log.debug("isUplinkPortOfOlt: DeviceId: {} Port: {}", dId, p); |
| // do only for devices for which we are the master |
| if (!mastershipService.isLocalMaster(dId)) { |
| return false; |
| } |
| |
| Device d = deviceService.getDevice(dId); |
| SubscriberAndDeviceInformation deviceInfo = subsService.get(d.serialNumber()); |
| |
| if (deviceInfo != null) { |
| return (deviceInfo.uplinkPort() == p.number().toLong()); |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Returns the connectPoint which is the uplink port of the OLT. |
| */ |
| private ConnectPoint getUplinkConnectPointOfOlt(DeviceId dId) { |
| |
| Device d = deviceService.getDevice(dId); |
| SubscriberAndDeviceInformation deviceInfo = subsService.get(d.serialNumber()); |
| log.debug("getUplinkConnectPointOfOlt DeviceId: {} devInfo: {}", dId, deviceInfo); |
| if (deviceInfo != null) { |
| PortNumber pNum = PortNumber.portNumber(deviceInfo.uplinkPort()); |
| Port port = deviceService.getPort(d.id(), pNum); |
| if (port != null) { |
| return new ConnectPoint(d.id(), pNum); |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Request DHCP packet from particular connect point via PacketService. |
| * Optionally provide a priority for the trap flow. If no such priority is |
| * provided, the default priority will be used. |
| * |
| * @param cp the connect point to trap dhcp packets from |
| * @param priority of the trap flow, null to use default priority |
| */ |
| private void requestDhcpPacketsFromConnectPoint(ConnectPoint cp, |
| Optional<PacketPriority> priority) { |
| TrafficSelector.Builder selectorServer = DefaultTrafficSelector.builder() |
| .matchEthType(Ethernet.TYPE_IPV4) |
| .matchInPort(cp.port()) |
| .matchIPProtocol(IPv4.PROTOCOL_UDP) |
| .matchUdpSrc(TpPort.tpPort(UDP.DHCP_SERVER_PORT)); |
| packetService.requestPackets(selectorServer.build(), |
| priority.isPresent() ? priority.get() : PacketPriority.CONTROL, |
| appId, Optional.of(cp.deviceId())); |
| } |
| |
| /** |
| * Cancel DHCP packet from particular connect point via PacketService. If |
| * the request was made with a specific packet priority, then the same |
| * priority should be used in this call. |
| * |
| * @param cp the connect point for the trap flow |
| * @param priority with which the trap flow was requested; if request |
| * priority was not specified, this param should also be null |
| */ |
| private void cancelDhcpPacketsFromConnectPoint(ConnectPoint cp, |
| Optional<PacketPriority> priority) { |
| TrafficSelector.Builder selectorServer = DefaultTrafficSelector.builder() |
| .matchEthType(Ethernet.TYPE_IPV4) |
| .matchInPort(cp.port()) |
| .matchIPProtocol(IPv4.PROTOCOL_UDP) |
| .matchUdpSrc(TpPort.tpPort(UDP.DHCP_SERVER_PORT)); |
| packetService.cancelPackets(selectorServer.build(), |
| priority.isPresent() ? priority.get() : PacketPriority.CONTROL, |
| appId, Optional.of(cp.deviceId())); |
| } |
| |
| public static Map<String, DhcpAllocationInfo> allocationMap() { |
| return allocationMap; |
| } |
| |
| private SubscriberAndDeviceInformation getDevice(PacketContext context) { |
| String serialNo = deviceService.getDevice(context.inPacket(). |
| receivedFrom().deviceId()).serialNumber(); |
| |
| return subsService.get(serialNo); |
| } |
| |
| private SubscriberAndDeviceInformation getDevice(ConnectPoint cp) { |
| String serialNo = deviceService.getDevice(cp.deviceId()). |
| serialNumber(); |
| |
| return subsService.get(serialNo); |
| } |
| |
| private MacAddress relayAgentMacAddress(PacketContext context) { |
| |
| SubscriberAndDeviceInformation device = this.getDevice(context); |
| if (device == null) { |
| log.warn("Device not found for {}", context.inPacket(). |
| receivedFrom()); |
| return null; |
| } |
| |
| return device.hardwareIdentifier(); |
| } |
| |
| private String nasPortId(PacketContext context) { |
| return nasPortId(context.inPacket().receivedFrom()); |
| } |
| |
| private String nasPortId(ConnectPoint cp) { |
| Port p = deviceService.getPort(cp); |
| return p.annotations().value(AnnotationKeys.PORT_NAME); |
| } |
| |
| private SubscriberAndDeviceInformation getSubscriber(PacketContext context) { |
| return subsService.get(nasPortId(context)); |
| } |
| |
| private VlanId cTag(PacketContext context) { |
| SubscriberAndDeviceInformation sub = getSubscriber(context); |
| if (sub == null) { |
| log.warn("Subscriber info not found for {}", context.inPacket(). |
| receivedFrom()); |
| return VlanId.NONE; |
| } |
| return sub.cTag(); |
| } |
| |
| private VlanId cTag(ConnectPoint cp) { |
| String portId = nasPortId(cp); |
| SubscriberAndDeviceInformation sub = subsService.get(portId); |
| if (sub == null) { |
| log.warn("Subscriber info not found for {} looking for C-TAG", cp); |
| return VlanId.NONE; |
| } |
| return sub.cTag(); |
| } |
| |
| private VlanId sTag(ConnectPoint cp) { |
| String portId = nasPortId(cp); |
| SubscriberAndDeviceInformation sub = subsService.get(portId); |
| if (sub == null) { |
| log.warn("Subscriber info not found for {} looking for S-TAG", cp); |
| return VlanId.NONE; |
| } |
| return sub.sTag(); |
| } |
| |
| private VlanId sTag(PacketContext context) { |
| SubscriberAndDeviceInformation sub = getSubscriber(context); |
| if (sub == null) { |
| log.warn("Subscriber info not found for {}", context.inPacket(). |
| receivedFrom()); |
| return VlanId.NONE; |
| } |
| return sub.sTag(); |
| } |
| |
| private class DhcpRelayPacketProcessor implements PacketProcessor { |
| |
| @Override |
| public void process(PacketContext context) { |
| if (!configured()) { |
| log.warn("Missing DHCP relay config. Abort packet processing"); |
| return; |
| } |
| |
| // process the packet and get the payload |
| Ethernet packet = context.inPacket().parsed(); |
| |
| if (packet == null) { |
| log.warn("Packet is null"); |
| return; |
| } |
| |
| if (packet.getEtherType() == Ethernet.TYPE_IPV4) { |
| IPv4 ipv4Packet = (IPv4) packet.getPayload(); |
| |
| if (ipv4Packet.getProtocol() == IPv4.PROTOCOL_UDP) { |
| UDP udpPacket = (UDP) ipv4Packet.getPayload(); |
| if (udpPacket.getSourcePort() == UDP.DHCP_CLIENT_PORT || |
| udpPacket.getSourcePort() == UDP.DHCP_SERVER_PORT) { |
| DHCP dhcpPayload = (DHCP) udpPacket.getPayload(); |
| //This packet is dhcp. |
| processDhcpPacket(context, packet, dhcpPayload); |
| } |
| } |
| } |
| } |
| |
| //forward the packet to ConnectPoint where the DHCP server is attached. |
| private void forwardPacket(Ethernet packet, PacketContext context) { |
| ConnectPoint toSendTo = null; |
| |
| if (!useOltUplink) { |
| toSendTo = dhcpServerConnectPoint.get(); |
| } else { |
| toSendTo = getUplinkConnectPointOfOlt(context.inPacket(). |
| receivedFrom().deviceId()); |
| } |
| |
| if (toSendTo != null) { |
| TrafficTreatment t = DefaultTrafficTreatment.builder() |
| .setOutput(toSendTo.port()).build(); |
| OutboundPacket o = new DefaultOutboundPacket( |
| toSendTo.deviceId(), t, |
| ByteBuffer.wrap(packet.serialize())); |
| if (log.isTraceEnabled()) { |
| log.trace("Relaying packet to dhcp server at {} {}", |
| toSendTo, packet); |
| } |
| packetService.emit(o); |
| } else { |
| log.error("No connect point to send msg to DHCP Server"); |
| } |
| } |
| |
| // get the type of the DHCP packet |
| private DHCP.MsgType getDhcpPacketType(DHCP dhcpPayload) { |
| |
| for (DhcpOption option : dhcpPayload.getOptions()) { |
| if (option.getCode() == OptionCode_MessageType.getValue()) { |
| byte[] data = option.getData(); |
| return DHCP.MsgType.getType(data[0]); |
| } |
| } |
| return null; |
| } |
| |
| //process the dhcp packet before sending to server |
| private void processDhcpPacket(PacketContext context, Ethernet packet, |
| DHCP dhcpPayload) { |
| if (dhcpPayload == null) { |
| log.warn("DHCP payload is null"); |
| return; |
| } |
| |
| DHCP.MsgType incomingPacketType = getDhcpPacketType(dhcpPayload); |
| |
| log.info("Received DHCP Packet of type {} from {}", |
| incomingPacketType, context.inPacket().receivedFrom()); |
| |
| switch (incomingPacketType) { |
| case DHCPDISCOVER: |
| Ethernet ethernetPacketDiscover = |
| processDhcpPacketFromClient(context, packet); |
| if (ethernetPacketDiscover != null) { |
| forwardPacket(ethernetPacketDiscover, context); |
| } |
| break; |
| case DHCPOFFER: |
| //reply to dhcp client. |
| Ethernet ethernetPacketOffer = |
| processDhcpPacketFromServer(context, packet); |
| if (ethernetPacketOffer != null) { |
| sendReply(ethernetPacketOffer, dhcpPayload); |
| } |
| break; |
| case DHCPREQUEST: |
| Ethernet ethernetPacketRequest = |
| processDhcpPacketFromClient(context, packet); |
| if (ethernetPacketRequest != null) { |
| forwardPacket(ethernetPacketRequest, context); |
| } |
| break; |
| case DHCPACK: |
| //reply to dhcp client. |
| Ethernet ethernetPacketAck = |
| processDhcpPacketFromServer(context, packet); |
| if (ethernetPacketAck != null) { |
| sendReply(ethernetPacketAck, dhcpPayload); |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| |
| private Ethernet processDhcpPacketFromClient(PacketContext context, |
| Ethernet ethernetPacket) { |
| if (log.isTraceEnabled()) { |
| log.trace("DHCP packet received from client at {} {}", |
| context.inPacket().receivedFrom(), ethernetPacket); |
| } |
| |
| MacAddress relayAgentMac = relayAgentMacAddress(context); |
| if (relayAgentMac == null) { |
| log.warn("RelayAgent MAC not found "); |
| return null; |
| } |
| |
| Ethernet etherReply = ethernetPacket; |
| |
| IPv4 ipv4Packet = (IPv4) etherReply.getPayload(); |
| UDP udpPacket = (UDP) ipv4Packet.getPayload(); |
| DHCP dhcpPacket = (DHCP) udpPacket.getPayload(); |
| |
| if (enableDhcpBroadcastReplies) { |
| // We want the reply to come back as a L2 broadcast |
| dhcpPacket.setFlags((short) 0x8000); |
| } |
| |
| MacAddress clientMac = MacAddress.valueOf(dhcpPacket.getClientHardwareAddress()); |
| IpAddress clientIp = IpAddress.valueOf(dhcpPacket.getClientIPAddress()); |
| |
| SubscriberAndDeviceInformation entry = getSubscriber(context); |
| if (entry == null) { |
| log.warn("Dropping packet as subscriber entry is not available"); |
| return null; |
| } |
| |
| DhcpAllocationInfo info = new DhcpAllocationInfo( |
| context.inPacket().receivedFrom(), dhcpPacket.getPacketType(), |
| entry.nasPortId(), clientMac, clientIp); |
| |
| allocationMap.put(entry.nasPortId(), info); |
| |
| post(new DhcpL2RelayEvent(DhcpL2RelayEvent.Type.UPDATED, info, |
| context.inPacket().receivedFrom())); |
| |
| if (option82) { |
| DHCP dhcpPacketWithOption82 = addOption82(dhcpPacket, entry); |
| udpPacket.setPayload(dhcpPacketWithOption82); |
| } |
| |
| ipv4Packet.setPayload(udpPacket); |
| etherReply.setPayload(ipv4Packet); |
| if (modifyClientPktsSrcDstMac) { |
| etherReply.setSourceMACAddress(relayAgentMac); |
| etherReply.setDestinationMACAddress(dhcpConnectMac); |
| } |
| |
| etherReply.setPriorityCode(ethernetPacket.getPriorityCode()); |
| etherReply.setVlanID(cTag(context).toShort()); |
| etherReply.setQinQTPID(Ethernet.TYPE_VLAN); |
| etherReply.setQinQVID(sTag(context).toShort()); |
| log.info("Finished processing packet.. relaying to dhcpServer"); |
| return etherReply; |
| } |
| |
| //build the DHCP offer/ack with proper client port. |
| private Ethernet processDhcpPacketFromServer(PacketContext context, |
| Ethernet ethernetPacket) { |
| if (log.isTraceEnabled()) { |
| log.trace("DHCP packet received from server at {} {}", |
| context.inPacket().receivedFrom(), ethernetPacket); |
| } |
| // get dhcp header. |
| Ethernet etherReply = (Ethernet) ethernetPacket.clone(); |
| IPv4 ipv4Packet = (IPv4) etherReply.getPayload(); |
| UDP udpPacket = (UDP) ipv4Packet.getPayload(); |
| DHCP dhcpPayload = (DHCP) udpPacket.getPayload(); |
| |
| MacAddress dstMac = valueOf(dhcpPayload.getClientHardwareAddress()); |
| ConnectPoint subsCp = getConnectPointOfClient(dstMac); |
| // If we can't find the subscriber, can't process further |
| if (subsCp == null) { |
| log.warn("Couldn't find connection point for mac address {} DHCPOFFERs won't be delivered", dstMac); |
| return null; |
| } |
| // if it's an ACK packet store the information for display purpose |
| if (getDhcpPacketType(dhcpPayload) == DHCP.MsgType.DHCPACK) { |
| |
| String portId = nasPortId(subsCp); |
| SubscriberAndDeviceInformation sub = subsService.get(portId); |
| if (sub != null) { |
| List<DhcpOption> options = dhcpPayload.getOptions(); |
| List<DhcpOption> circuitIds = options.stream() |
| .filter(option -> option.getCode() == DHCP.DHCPOptionCode.OptionCode_CircuitID.getValue()) |
| .collect(Collectors.toList()); |
| |
| String circuitId = "None"; |
| if (circuitIds.size() == 1) { |
| byte[] array = circuitIds.get(0).getData(); |
| |
| try { |
| // we leave the first two bytes as they are the id and length |
| circuitId = new String(Arrays.copyOfRange(array, 2, array.length), "UTF-8"); |
| } catch (Exception e) { } |
| } |
| |
| IpAddress ip = IpAddress.valueOf(dhcpPayload.getYourIPAddress()); |
| |
| //storeDHCPAllocationInfo |
| DhcpAllocationInfo info = new DhcpAllocationInfo(subsCp, |
| dhcpPayload.getPacketType(), circuitId, dstMac, ip); |
| |
| allocationMap.put(sub.nasPortId(), info); |
| |
| post(new DhcpL2RelayEvent(DhcpL2RelayEvent.Type.UPDATED, info, subsCp)); |
| } |
| } // end storing of info |
| |
| // we leave the srcMac from the original packet |
| etherReply.setDestinationMACAddress(dstMac); |
| etherReply.setQinQVID(sTag(subsCp).toShort()); |
| etherReply.setPriorityCode(ethernetPacket.getPriorityCode()); |
| etherReply.setVlanID((cTag(subsCp).toShort())); |
| |
| if (option82) { |
| udpPacket.setPayload(removeOption82(dhcpPayload)); |
| } else { |
| udpPacket.setPayload(dhcpPayload); |
| } |
| ipv4Packet.setPayload(udpPacket); |
| etherReply.setPayload(ipv4Packet); |
| |
| log.info("Finished processing packet.. relaying to client"); |
| return etherReply; |
| } |
| |
| /* |
| * Get ConnectPoint of the Client based on it's MAC address |
| */ |
| private ConnectPoint getConnectPointOfClient(MacAddress dstMac) { |
| Set<Host> hosts = hostService.getHostsByMac(dstMac); |
| if (hosts == null || hosts.isEmpty()) { |
| log.warn("Cannot determine host for DHCP client: {}. Aborting " |
| + "relay for dhcp packet from server", |
| dstMac); |
| return null; |
| } |
| for (Host h : hosts) { |
| // if more than one, |
| // find the connect point which has an valid entry in SADIS |
| ConnectPoint cp = new ConnectPoint(h.location().deviceId(), |
| h.location().port()); |
| |
| if (sTag(cp) != VlanId.NONE) { |
| return cp; |
| } |
| } |
| |
| return null; |
| } |
| |
| //send the response to the requester host. |
| private void sendReply(Ethernet ethPacket, DHCP dhcpPayload) { |
| MacAddress descMac = valueOf(dhcpPayload.getClientHardwareAddress()); |
| ConnectPoint subCp = getConnectPointOfClient(descMac); |
| |
| // Send packet out to requester if the host information is available |
| if (subCp != null) { |
| log.info("Sending DHCP packet to client at {}", subCp); |
| TrafficTreatment t = DefaultTrafficTreatment.builder() |
| .setOutput(subCp.port()).build(); |
| OutboundPacket o = new DefaultOutboundPacket( |
| subCp.deviceId(), t, ByteBuffer.wrap(ethPacket.serialize())); |
| if (log.isTraceEnabled()) { |
| log.trace("Relaying packet to dhcp client at {} {}", subCp, |
| ethPacket); |
| } |
| packetService.emit(o); |
| } else { |
| log.error("Dropping DHCP packet because can't find host for {}", descMac); |
| } |
| } |
| } |
| |
| private DHCP addOption82(DHCP dhcpPacket, SubscriberAndDeviceInformation entry) { |
| log.debug("option82data {} ", entry); |
| |
| List<DhcpOption> options = Lists.newArrayList(dhcpPacket.getOptions()); |
| DhcpOption82 option82 = new DhcpOption82(); |
| option82.setAgentCircuitId(entry.circuitId()); |
| option82.setAgentRemoteId(entry.remoteId()); |
| DhcpOption option = new DhcpOption() |
| .setCode(DHCP.DHCPOptionCode.OptionCode_CircuitID.getValue()) |
| .setData(option82.toByteArray()) |
| .setLength(option82.length()); |
| |
| options.add(options.size() - 1, option); |
| dhcpPacket.setOptions(options); |
| |
| return dhcpPacket; |
| |
| } |
| |
| private DHCP removeOption82(DHCP dhcpPacket) { |
| List<DhcpOption> options = dhcpPacket.getOptions(); |
| List<DhcpOption> newoptions = options.stream() |
| .filter(option -> option.getCode() != DHCP.DHCPOptionCode.OptionCode_CircuitID.getValue()) |
| .collect(Collectors.toList()); |
| |
| return dhcpPacket.setOptions(newoptions); |
| } |
| /** |
| * Listener for network config events. |
| */ |
| private class InternalConfigListener implements NetworkConfigListener { |
| |
| @Override |
| public void event(NetworkConfigEvent event) { |
| |
| if ((event.type() == NetworkConfigEvent.Type.CONFIG_ADDED || |
| event.type() == NetworkConfigEvent.Type.CONFIG_UPDATED) && |
| event.configClass().equals(DhcpL2RelayConfig.class)) { |
| updateConfig(); |
| log.info("Reconfigured"); |
| } |
| } |
| } |
| |
| /** |
| * Handles Mastership changes for the devices which connect |
| * to the DHCP server. |
| */ |
| private class InnerMastershipListener implements MastershipListener { |
| @Override |
| public void event(MastershipEvent event) { |
| if (!useOltUplink) { |
| if (dhcpServerConnectPoint.get() != null && |
| dhcpServerConnectPoint.get().deviceId(). |
| equals(event.subject())) { |
| log.trace("Mastership Event recevived for {}", event.subject()); |
| // mastership of the device for our connect point has changed |
| // reselect |
| selectServerConnectPoint(); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Handles Device status change for the devices which connect |
| * to the DHCP server. |
| */ |
| private class InnerDeviceListener implements DeviceListener { |
| @Override |
| public void event(DeviceEvent event) { |
| if (log.isTraceEnabled() && |
| !event.type().equals(DeviceEvent.Type.PORT_STATS_UPDATED)) { |
| log.trace("Device Event received for {} event {}", |
| event.subject(), event.type()); |
| } |
| if (!useOltUplink) { |
| if (dhcpServerConnectPoint.get() == null) { |
| switch (event.type()) { |
| case DEVICE_ADDED: |
| case DEVICE_AVAILABILITY_CHANGED: |
| // some device is available check if we can get a |
| // connect point we can use |
| addOrRemoveDhcpTrapFromServer(true); |
| break; |
| default: |
| break; |
| } |
| return; |
| } |
| if (dhcpServerConnectPoint.get().deviceId(). |
| equals(event.subject().id())) { |
| switch (event.type()) { |
| case DEVICE_AVAILABILITY_CHANGED: |
| case DEVICE_REMOVED: |
| case DEVICE_SUSPENDED: |
| // state of our device has changed, check if we need |
| // to re-select a connectpoint |
| addOrRemoveDhcpTrapFromServer(true); |
| break; |
| default: |
| break; |
| } |
| } |
| } else { |
| switch (event.type()) { |
| case PORT_ADDED: |
| if (useOltUplink && isUplinkPortOfOlt(event.subject().id(), event.port())) { |
| requestDhcpPacketsFromConnectPoint( |
| new ConnectPoint(event.subject().id(), event.port().number()), |
| null); |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| } |
| } |