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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.igmp.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.IPv4;
import org.onlab.packet.Ip4Address;
import org.onlab.packet.IpAddress;
import org.onlab.packet.IpPrefix;
import org.onlab.packet.IGMP;
import org.onosproject.core.ApplicationId;
import org.onosproject.core.CoreService;
import org.onosproject.net.flow.DefaultTrafficSelector;
import org.onosproject.net.flow.TrafficSelector;
import org.onosproject.net.packet.InboundPacket;
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;
/**
* Internet Group Management Protocol.
*/
@Component(immediate = true)
public class IGMPComponent {
private final Logger log = getLogger(getClass());
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected PacketService packetService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected CoreService coreService;
private IGMPPacketProcessor processor = new IGMPPacketProcessor();
private static ApplicationId appId;
@Activate
public void activate() {
appId = coreService.registerApplication("org.onosproject.igmp");
packetService.addProcessor(processor, PacketProcessor.director(1));
// Build a traffic selector for all multicast traffic
TrafficSelector.Builder selector = DefaultTrafficSelector.builder();
selector.matchEthType(Ethernet.TYPE_IPV4);
selector.matchIPProtocol(IPv4.PROTOCOL_IGMP);
packetService.requestPackets(selector.build(), PacketPriority.REACTIVE, appId);
log.info("Started");
}
@Deactivate
public void deactivate() {
packetService.removeProcessor(processor);
processor = null;
log.info("Stopped");
}
/**
* Packet processor responsible for handling IGMP packets.
*/
private class IGMPPacketProcessor 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;
}
InboundPacket pkt = context.inPacket();
Ethernet ethPkt = pkt.parsed();
if (ethPkt == null) {
return;
}
/*
* IPv6 MLD packets are handled by ICMP6. We'll only deal
* with IPv4.
*/
if (ethPkt.getEtherType() != Ethernet.TYPE_IPV4) {
return;
}
IPv4 ip = (IPv4) ethPkt.getPayload();
IpAddress gaddr = IpAddress.valueOf(ip.getDestinationAddress());
IpAddress saddr = Ip4Address.valueOf(ip.getSourceAddress());
log.debug("Packet (" + saddr.toString() + ", " + gaddr.toString() +
"\tingress port: " + context.inPacket().receivedFrom().toString());
if (ip.getProtocol() != IPv4.PROTOCOL_IGMP) {
log.debug("IGMP Picked up a non IGMP packet.");
return;
}
IpPrefix mcast = IpPrefix.valueOf("224.0.0.0/4");
if (!mcast.contains(gaddr)) {
log.debug("IGMP Picked up a non multicast packet.");
return;
}
if (mcast.contains(saddr)) {
log.debug("IGMP Picked up a packet with a multicast source address.");
return;
}
IpPrefix spfx = IpPrefix.valueOf(saddr, 32);
IpPrefix gpfx = IpPrefix.valueOf(gaddr, 32);
IGMP igmp = (IGMP) ip.getPayload();
switch (igmp.getIgmpType()) {
case IGMP.TYPE_IGMPV3_MEMBERSHIP_REPORT:
IGMPProcessMembership.processMembership(igmp, pkt.receivedFrom());
break;
case IGMP.TYPE_IGMPV3_MEMBERSHIP_QUERY:
IGMPProcessQuery.processQuery(igmp, pkt.receivedFrom());
break;
case IGMP.TYPE_IGMPV1_MEMBERSHIP_REPORT:
case IGMP.TYPE_IGMPV2_MEMBERSHIP_REPORT:
case IGMP.TYPE_IGMPV2_LEAVE_GROUP:
log.debug("IGMP version 1 & 2 message types are not currently supported. Message type: " +
igmp.getIgmpType());
break;
default:
log.debug("Unkown IGMP message type: " + igmp.getIgmpType());
break;
}
}
}
}
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