| /* |
| * Copyright 2015-present 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.bgprouter; |
| |
| import org.onlab.packet.Ethernet; |
| import org.onlab.packet.IPv4; |
| import org.onlab.packet.IpAddress; |
| import org.onlab.packet.TCP; |
| import org.onlab.packet.TpPort; |
| import org.onosproject.core.ApplicationId; |
| import org.onosproject.incubator.net.intf.Interface; |
| import org.onosproject.incubator.net.intf.InterfaceService; |
| import org.onosproject.net.ConnectPoint; |
| 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.DefaultForwardingObjective; |
| import org.onosproject.net.flowobjective.FlowObjectiveService; |
| import org.onosproject.net.flowobjective.ForwardingObjective; |
| import org.onosproject.net.packet.DefaultOutboundPacket; |
| 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.routing.config.BgpConfig; |
| import org.slf4j.Logger; |
| |
| import java.util.Optional; |
| import java.util.Set; |
| |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| |
| /** |
| * Manages connectivity between peers by tunnelling BGP traffic through |
| * OpenFlow packet-ins and packet-outs. |
| */ |
| public class TunnellingConnectivityManager { |
| |
| private static final short BGP_PORT = 179; |
| private final Logger log = getLogger(getClass()); |
| private final ApplicationId appId; |
| |
| private final BgpConfig.BgpSpeakerConfig bgpSpeaker; |
| |
| private final PacketService packetService; |
| private final InterfaceService interfaceService; |
| private final FlowObjectiveService flowObjectiveService; |
| |
| private final BgpProcessor processor = new BgpProcessor(); |
| |
| public TunnellingConnectivityManager(ApplicationId appId, |
| BgpConfig bgpConfig, |
| InterfaceService interfaceService, |
| PacketService packetService, |
| FlowObjectiveService flowObjectiveService) { |
| this.appId = appId; |
| this.interfaceService = interfaceService; |
| this.packetService = packetService; |
| this.flowObjectiveService = flowObjectiveService; |
| |
| Optional<BgpConfig.BgpSpeakerConfig> bgpSpeaker = |
| bgpConfig.bgpSpeakers().stream().findAny(); |
| |
| if (!bgpSpeaker.isPresent()) { |
| throw new IllegalArgumentException("Must have at least one BGP speaker configured"); |
| } |
| |
| this.bgpSpeaker = bgpSpeaker.get(); |
| |
| } |
| |
| public void start() { |
| packetService.addProcessor(processor, PacketProcessor.director(3)); |
| } |
| |
| public void stop() { |
| packetService.removeProcessor(processor); |
| // Should revoke packet requests in the future |
| } |
| |
| /** |
| * Pushes the flow rules for forwarding BGP TCP packets to controller. |
| * It is called when switches are connected and available. |
| */ |
| public void notifySwitchAvailable() { |
| // control plane OVS is available, push default flows |
| TrafficSelector selectorDst = DefaultTrafficSelector.builder() |
| .matchEthType(Ethernet.TYPE_IPV4) |
| .matchIPProtocol(IPv4.PROTOCOL_TCP) |
| .matchTcpDst(TpPort.tpPort(BGP_PORT)) |
| .build(); |
| |
| TrafficSelector selectorSrc = DefaultTrafficSelector.builder() |
| .matchEthType(Ethernet.TYPE_IPV4) |
| .matchIPProtocol(IPv4.PROTOCOL_TCP) |
| .matchTcpSrc(TpPort.tpPort(BGP_PORT)) |
| .build(); |
| |
| TrafficTreatment treatment = DefaultTrafficTreatment.builder() |
| .punt() |
| .build(); |
| |
| ForwardingObjective puntSrc = DefaultForwardingObjective.builder() |
| .fromApp(appId) |
| .makePermanent() |
| .withSelector(selectorSrc) |
| .withTreatment(treatment) |
| .withFlag(ForwardingObjective.Flag.VERSATILE) |
| .add(); |
| flowObjectiveService.forward(bgpSpeaker.connectPoint().deviceId(), |
| puntSrc); |
| |
| ForwardingObjective puntDst = DefaultForwardingObjective.builder() |
| .fromApp(appId) |
| .makePermanent() |
| .withSelector(selectorDst) |
| .withTreatment(treatment) |
| .withFlag(ForwardingObjective.Flag.VERSATILE) |
| .add(); |
| flowObjectiveService.forward(bgpSpeaker.connectPoint().deviceId(), |
| puntDst); |
| log.info("Sent punt forwarding objective to {}", bgpSpeaker.connectPoint().deviceId()); |
| } |
| |
| /** |
| * Forwards a BGP packet to another connect point. |
| * |
| * @param context the packet context of the incoming packet |
| */ |
| private void forward(PacketContext context) { |
| ConnectPoint outputPort = null; |
| |
| IPv4 ipv4 = (IPv4) context.inPacket().parsed().getPayload(); |
| IpAddress dstAddress = IpAddress.valueOf(ipv4.getDestinationAddress()); |
| |
| if (context.inPacket().receivedFrom().equals(bgpSpeaker.connectPoint())) { |
| if (bgpSpeaker.peers().contains(dstAddress)) { |
| Interface intf = interfaceService.getMatchingInterface(dstAddress); |
| if (intf != null) { |
| outputPort = intf.connectPoint(); |
| } |
| } |
| } else { |
| Set<Interface> interfaces = |
| interfaceService.getInterfacesByPort(context.inPacket().receivedFrom()); |
| |
| if (interfaces.stream() |
| .flatMap(intf -> intf.ipAddresses().stream()) |
| .anyMatch(ia -> ia.ipAddress().equals(dstAddress))) { |
| outputPort = bgpSpeaker.connectPoint(); |
| } |
| } |
| |
| if (outputPort != null) { |
| TrafficTreatment t = DefaultTrafficTreatment.builder() |
| .setOutput(outputPort.port()).build(); |
| OutboundPacket o = new DefaultOutboundPacket( |
| outputPort.deviceId(), t, context.inPacket().unparsed()); |
| packetService.emit(o); |
| } |
| } |
| |
| /** |
| * Packet processor responsible receiving and filtering BGP packets. |
| */ |
| private class BgpProcessor implements PacketProcessor { |
| |
| @Override |
| public void process(PacketContext context) { |
| // Stop processing if the packet has been handled, since we |
| // can't do any more to it. |
| if (context.isHandled()) { |
| return; |
| } |
| |
| Ethernet packet = context.inPacket().parsed(); |
| |
| if (packet == null) { |
| return; |
| } |
| |
| if (packet.getEtherType() == Ethernet.TYPE_IPV4) { |
| IPv4 ipv4Packet = (IPv4) packet.getPayload(); |
| if (ipv4Packet.getProtocol() == IPv4.PROTOCOL_TCP) { |
| TCP tcpPacket = (TCP) ipv4Packet.getPayload(); |
| |
| if (tcpPacket.getDestinationPort() == BGP_PORT || |
| tcpPacket.getSourcePort() == BGP_PORT) { |
| forward(context); |
| } |
| } |
| } |
| } |
| } |
| } |