| /* |
| * Copyright 2015 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.mfwd.impl; |
| |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| import org.apache.felix.scr.annotations.Activate; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Deactivate; |
| import org.apache.felix.scr.annotations.Reference; |
| import org.apache.felix.scr.annotations.ReferenceCardinality; |
| |
| import org.onlab.packet.Ethernet; |
| import org.onlab.packet.IpPrefix; |
| import org.onlab.packet.IpAddress; |
| import org.onlab.packet.Ip4Address; |
| import org.onlab.packet.IPv4; |
| import org.onosproject.core.ApplicationId; |
| import org.onosproject.core.CoreService; |
| 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.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.PacketPriority; |
| import org.onosproject.net.packet.PacketProcessor; |
| import org.onosproject.net.packet.PacketService; |
| import org.slf4j.Logger; |
| |
| /** |
| * WORK-IN-PROGRESS: The multicast forwarding application using intent framework. |
| */ |
| @Component(immediate = true) |
| public class McastForwarding { |
| |
| private final Logger log = getLogger(getClass()); |
| private final IpPrefix mcast = IpPrefix.valueOf("224.0.0.0/4"); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected PacketService packetService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected CoreService coreService; |
| |
| private ReactivePacketProcessor processor = new ReactivePacketProcessor(); |
| private McastRouteTable mrib; |
| private static ApplicationId appId; |
| |
| /** |
| * Active MulticastForwardingIntent. |
| */ |
| @Activate |
| public void activate() { |
| appId = coreService.registerApplication("org.onosproject.mfwd"); |
| |
| packetService.addProcessor(processor, PacketProcessor.director(2)); |
| |
| // Build a traffic selector for all multicast traffic |
| TrafficSelector.Builder selector = DefaultTrafficSelector.builder(); |
| selector.matchEthType(Ethernet.TYPE_IPV4); |
| selector.matchIPDst(mcast); |
| packetService.requestPackets(selector.build(), PacketPriority.REACTIVE, appId); |
| |
| mrib = McastRouteTable.getInstance(); |
| log.info("Started"); |
| } |
| |
| /** |
| * Deactivate Multicast Forwarding Intent. |
| */ |
| @Deactivate |
| public void deactivate() { |
| packetService.removeProcessor(processor); |
| processor = null; |
| log.info("Stopped"); |
| } |
| |
| /** |
| * Get the application ID, used by the McastIntentManager. |
| * |
| * @return the application ID |
| */ |
| public static ApplicationId getAppId() { |
| return appId; |
| } |
| |
| /** |
| * Packet processor responsible for forwarding packets along their paths. |
| */ |
| private class ReactivePacketProcessor implements PacketProcessor { |
| |
| /** |
| * Process incoming packets. |
| * |
| * @param context packet processing context |
| */ |
| @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; |
| } |
| |
| InboundPacket pkt = context.inPacket(); |
| Ethernet ethPkt = pkt.parsed(); |
| |
| if (ethPkt == null) { |
| return; |
| } |
| |
| if (ethPkt.getEtherType() != Ethernet.TYPE_IPV4 && |
| ethPkt.getEtherType() != Ethernet.TYPE_IPV6) { |
| return; |
| } |
| |
| if (ethPkt.getEtherType() == Ethernet.TYPE_IPV6) { |
| // Ignore ipv6 at the moment. |
| return; |
| } |
| |
| IPv4 ip = (IPv4) ethPkt.getPayload(); |
| IpAddress gaddr = IpAddress.valueOf(ip.getDestinationAddress()); |
| IpAddress saddr = Ip4Address.valueOf(ip.getSourceAddress()); |
| |
| log.debug("Packet ({}, {}) has been punted\n" + |
| "\tingress port: {}\n", |
| saddr.toString(), |
| gaddr.toString(), |
| context.inPacket().receivedFrom().toString()); |
| |
| if (!mcast.contains(gaddr)) { |
| // Yikes, this is a bad group address |
| return; |
| } |
| |
| if (mcast.contains(saddr)) { |
| // Yikes, the source address is multicast |
| return; |
| } |
| |
| IpPrefix spfx = IpPrefix.valueOf(saddr, 32); |
| IpPrefix gpfx = IpPrefix.valueOf(gaddr, 32); |
| |
| /* |
| * Do a best match lookup on the (s, g) of the packet. If an entry does |
| * not exist create one and store it's incoming connect point. |
| * |
| * The connect point is deviceId / portId that the packet entered |
| * the SDN network. This differs from traditional mcast where the |
| * ingress port would be a specific device. |
| */ |
| McastRoute entry = mrib.findBestMatch(spfx, gpfx); |
| if (entry == null || entry.getSaddr().address().isZero()) { |
| |
| /* |
| * Create an entry that we can fast drop. |
| */ |
| entry = mrib.addRoute(spfx, gpfx); |
| entry.addIngressPoint(context.inPacket().receivedFrom()); |
| } |
| |
| /* |
| * TODO: If we do not have an ingress or any egress connect points we |
| * should set up a fast drop entry. |
| */ |
| if (entry.getIngressPoint() == null) { |
| return; |
| } |
| |
| if (entry.getEgressPoints().isEmpty()) { |
| return; |
| } |
| |
| /* |
| * This is odd, we should not have received a punted packet if an |
| * intent was installed unless the intent was not installed |
| * correctly. However, we are seeing packets get punted after |
| * the intent has been installed. |
| * |
| * Therefore we are going to forward the packets even if they |
| * should have already been forwarded by the intent fabric. |
| */ |
| if (entry.getIntentKey() != null) { |
| return; |
| } |
| |
| entry.setIntent(); |
| McastIntentManager im = McastIntentManager.getInstance(); |
| im.setIntent(entry); |
| |
| entry.incrementPuntCount(); |
| |
| // Send the pack out each of the egress devices & port |
| forwardPacketToDst(context, entry); |
| } |
| } |
| |
| /** |
| * Forward the packet to it's multicast destinations. |
| * |
| * @param context The packet context |
| * @param entry The multicast route entry matching this packet |
| */ |
| private void forwardPacketToDst(PacketContext context, McastRoute entry) { |
| |
| // Send the pack out each of the respective egress ports |
| for (ConnectPoint egress : entry.getEgressConnectPoints()) { |
| TrafficTreatment treatment = DefaultTrafficTreatment.builder() |
| .setOutput(egress.port()).build(); |
| |
| OutboundPacket packet = new DefaultOutboundPacket( |
| egress.deviceId(), |
| treatment, |
| context.inPacket().unparsed()); |
| |
| packetService.emit(packet); |
| } |
| } |
| } |