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/*
* 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().equals(IPv4.fromIPv4Address(0))) {
/*
* 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);
}
}
}
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