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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.virtualbng;
import static org.slf4j.LoggerFactory.getLogger;
import java.nio.ByteBuffer;
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.ARP;
import org.onlab.packet.Ethernet;
import org.onlab.packet.Ip4Address;
import org.onlab.packet.MacAddress;
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.PacketContext;
import org.onosproject.net.packet.PacketPriority;
import org.onosproject.net.packet.PacketProcessor;
import org.onosproject.net.packet.PacketService;
import org.slf4j.Logger;
/**
* When the upstream gateway which is outside local SDN network wants to send
* packets to our local public IP addresses, it will send out ARP requests to
* get the MAC address of each public IP address. Actually, there are no hosts
* configured with those public IP addresses, so this class is to emulate the
* behavior of the non-existed hosts and return ARP replies.
* <p>
* Since we will rewrite the destination MAC address in the switch before
* traffic packets go to the destination, so the MAC address can be any number.
* We manually configured a random MAC address for this purpose in the vBNG
* configuration file.
* </p>
*/
@Component(immediate = true)
public class VirtualPublicHosts {
private final Logger log = getLogger(getClass());
private static final String APP_NAME =
"org.onosproject.virtualbng.VirtualPublicHosts";
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected CoreService coreService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected PacketService packetService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected VbngConfigurationService vbngConfigService;
private ApplicationId appId;
private ArpRequestProcessor processor = new ArpRequestProcessor();
@Activate
public void activate() {
appId = coreService.registerApplication(APP_NAME);
packetService.addProcessor(processor, PacketProcessor.director(6));
requestIntercepts();
log.info("vBNG virtual public hosts started");
}
@Deactivate
public void deactivate() {
withdrawIntercepts();
packetService.removeProcessor(processor);
processor = null;
log.info("vBNG virtual public hosts Stopped");
}
/**
* Request packet in via PacketService.
*/
private void requestIntercepts() {
TrafficSelector.Builder selector = DefaultTrafficSelector.builder();
// Only IPv4 is supported in current vBNG.
selector.matchEthType(Ethernet.TYPE_ARP);
packetService.requestPackets(selector.build(),
PacketPriority.REACTIVE, appId);
}
/**
* Cancel request for packet in via PacketService.
*/
private void withdrawIntercepts() {
TrafficSelector.Builder selector = DefaultTrafficSelector.builder();
// Only IPv4 is supported in current vBNG.
selector.matchEthType(Ethernet.TYPE_ARP);
packetService.cancelPackets(selector.build(),
PacketPriority.REACTIVE, appId);
}
/**
* This class filters out the ARP request packets, generates the ARP
* reply packets, and emits those packets.
*/
private class ArpRequestProcessor implements PacketProcessor {
@Override
public void process(PacketContext context) {
InboundPacket pkt = context.inPacket();
Ethernet ethPkt = pkt.parsed();
// Only handle the ARP packets
if (ethPkt == null || ethPkt.getEtherType() != Ethernet.TYPE_ARP) {
return;
}
ARP arpPacket = (ARP) ethPkt.getPayload();
// Only handle ARP request packets
if (arpPacket.getOpCode() != ARP.OP_REQUEST) {
return;
}
Ip4Address targetIpAddress = Ip4Address
.valueOf(arpPacket.getTargetProtocolAddress());
// Only handle an ARP request when the target IP address inside is
// an assigned public IP address
if (!vbngConfigService.isAssignedPublicIpAddress(targetIpAddress)) {
return;
}
MacAddress virtualHostMac =
vbngConfigService.getPublicFacingMac();
if (virtualHostMac == null) {
return;
}
ConnectPoint srcConnectPoint = pkt.receivedFrom();
Ethernet eth = ARP.buildArpReply(targetIpAddress,
virtualHostMac,
ethPkt);
TrafficTreatment.Builder builder =
DefaultTrafficTreatment.builder();
builder.setOutput(srcConnectPoint.port());
packetService.emit(new DefaultOutboundPacket(
srcConnectPoint.deviceId(),
builder.build(),
ByteBuffer.wrap(eth.serialize())));
}
}
}
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