| /* |
| * 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.openstacknetworking.routing; |
| |
| import org.onlab.packet.ARP; |
| import org.onlab.packet.EthType; |
| import org.onlab.packet.Ethernet; |
| import org.onlab.packet.IPv4; |
| import org.onlab.packet.Ip4Address; |
| import org.onlab.packet.IpAddress; |
| import org.onlab.packet.MacAddress; |
| import org.onosproject.core.ApplicationId; |
| import org.onosproject.net.DeviceId; |
| 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.packet.DefaultOutboundPacket; |
| import org.onosproject.net.packet.PacketContext; |
| import org.onosproject.net.packet.PacketPriority; |
| import org.onosproject.net.packet.PacketService; |
| import org.onosproject.openstackinterface.OpenstackInterfaceService; |
| import org.onosproject.openstackinterface.OpenstackPort; |
| import org.slf4j.Logger; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Optional; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| /** |
| * Handle ARP packet sent from Openstack Gateway nodes. |
| */ |
| public class OpenstackRoutingArpHandler { |
| protected final Logger log = getLogger(getClass()); |
| |
| private final PacketService packetService; |
| private final OpenstackInterfaceService openstackService; |
| private final OpenstackRoutingConfig config; |
| private static final String NETWORK_ROUTER_GATEWAY = "network:router_gateway"; |
| |
| /** |
| * Default constructor. |
| * |
| * @param packetService packet service |
| * @param openstackService openstackInterface service |
| * @param config openstackRoutingConfig |
| */ |
| OpenstackRoutingArpHandler(PacketService packetService, OpenstackInterfaceService openstackService, |
| OpenstackRoutingConfig config) { |
| this.packetService = packetService; |
| this.openstackService = checkNotNull(openstackService); |
| this.config = checkNotNull(config); |
| } |
| |
| /** |
| * Requests ARP packet to GatewayNode. |
| * |
| * @param appId application id |
| */ |
| public void requestPacket(ApplicationId appId) { |
| |
| TrafficSelector arpSelector = DefaultTrafficSelector.builder() |
| .matchEthType(EthType.EtherType.ARP.ethType().toShort()) |
| .build(); |
| |
| packetService.requestPackets(arpSelector, |
| PacketPriority.CONTROL, |
| appId, |
| Optional.of(DeviceId.deviceId(config.gatewayBridgeId()))); |
| } |
| |
| /** |
| * Handles ARP packet. |
| * |
| * @param context packet context |
| * @param ethernet ethernet |
| */ |
| public void processArpPacketFromRouter(PacketContext context, Ethernet ethernet) { |
| checkNotNull(context, "context can not be null"); |
| checkNotNull(ethernet, "ethernet can not be null"); |
| |
| log.info("arpEvent called from {} to {}", |
| Ip4Address.valueOf(((IPv4) ethernet.getPayload()).getSourceAddress()).toString(), |
| Ip4Address.valueOf(((IPv4) ethernet.getPayload()).getDestinationAddress()).toString()); |
| ARP arp = (ARP) ethernet.getPayload(); |
| |
| if (arp.getOpCode() != ARP.OP_REQUEST) { |
| return; |
| } |
| |
| IpAddress targetIp = Ip4Address.valueOf(arp.getTargetProtocolAddress()); |
| MacAddress targetMac = getTargetMacForTargetIp(targetIp.getIp4Address()); |
| |
| if (targetMac == MacAddress.NONE) { |
| return; |
| } |
| |
| Ethernet ethReply = ARP.buildArpReply(targetIp.getIp4Address(), |
| targetMac, ethernet); |
| |
| TrafficTreatment treatment = DefaultTrafficTreatment.builder() |
| .setOutput(context.inPacket().receivedFrom().port()) |
| .build(); |
| |
| packetService.emit(new DefaultOutboundPacket( |
| context.inPacket().receivedFrom().deviceId(), |
| treatment, |
| ByteBuffer.wrap(ethReply.serialize()))); |
| } |
| |
| private MacAddress getTargetMacForTargetIp(Ip4Address targetIp) { |
| OpenstackPort port = openstackService.ports().stream() |
| .filter(p -> p.deviceOwner().equals(NETWORK_ROUTER_GATEWAY)) |
| .filter(p -> p.fixedIps().containsValue(targetIp.getIp4Address())) |
| .findAny().orElse(null); |
| |
| if (port == null) { |
| return MacAddress.NONE; |
| } |
| return port.macAddress(); |
| } |
| } |