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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.reactive.routing;
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.EthType;
import org.onlab.packet.Ethernet;
import org.onlab.packet.IPv4;
import org.onlab.packet.Ip4Address;
import org.onlab.packet.IpAddress;
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.OutboundPacket;
import org.onosproject.net.packet.PacketContext;
import org.onosproject.net.packet.PacketProcessor;
import org.onosproject.net.packet.PacketService;
import org.onosproject.routing.RoutingService;
import org.onosproject.routing.config.RoutingConfigurationService;
import org.slf4j.Logger;
import java.nio.ByteBuffer;
import static org.onlab.packet.Ethernet.TYPE_ARP;
import static org.onlab.packet.Ethernet.TYPE_IPV4;
import static org.onosproject.net.packet.PacketPriority.REACTIVE;
import static org.slf4j.LoggerFactory.getLogger;
/**
* This is reactive routing to handle 3 cases:
* (1) one host wants to talk to another host, both two hosts are in
* SDN network.
* (2) one host in SDN network wants to talk to another host in Internet.
* (3) one host from Internet wants to talk to another host in SDN network.
*/
@Component(immediate = true)
public class SdnIpReactiveRouting {
private static final String APP_NAME = "org.onosproject.reactive.routing";
private final Logger log = getLogger(getClass());
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected CoreService coreService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected PacketService packetService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected RoutingService routingService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected RoutingConfigurationService config;
private ApplicationId appId;
private ReactiveRoutingProcessor processor =
new ReactiveRoutingProcessor();
@Activate
public void activate() {
appId = coreService.registerApplication(APP_NAME);
packetService.addProcessor(processor, PacketProcessor.director(2));
requestIntercepts();
log.info("SDN-IP Reactive Routing Started");
}
@Deactivate
public void deactivate() {
withdrawIntercepts();
packetService.removeProcessor(processor);
processor = null;
log.info("SDN-IP Reactive Routing Stopped");
}
/**
* Request packet in via the PacketService.
*/
private void requestIntercepts() {
//TODO: to support IPv6 later
TrafficSelector.Builder selector = DefaultTrafficSelector.builder();
selector.matchEthType(TYPE_IPV4);
packetService.requestPackets(selector.build(), REACTIVE, appId);
selector.matchEthType(TYPE_ARP);
packetService.requestPackets(selector.build(), REACTIVE, appId);
}
/**
* Cancel request for packet in via PacketService.
*/
private void withdrawIntercepts() {
TrafficSelector.Builder selector = DefaultTrafficSelector.builder();
selector.matchEthType(TYPE_IPV4);
packetService.cancelPackets(selector.build(), REACTIVE, appId);
selector = DefaultTrafficSelector.builder();
selector.matchEthType(TYPE_ARP);
packetService.cancelPackets(selector.build(), REACTIVE, appId);
}
private class ReactiveRoutingProcessor implements PacketProcessor {
@Override
public void process(PacketContext context) {
InboundPacket pkt = context.inPacket();
Ethernet ethPkt = pkt.parsed();
if (ethPkt == null) {
return;
}
ConnectPoint srcConnectPoint = pkt.receivedFrom();
switch (EthType.EtherType.lookup(ethPkt.getEtherType())) {
case ARP:
ARP arpPacket = (ARP) ethPkt.getPayload();
Ip4Address targetIpAddress = Ip4Address
.valueOf(arpPacket.getTargetProtocolAddress());
// Only when it is an ARP request packet and the target IP
// address is a virtual gateway IP address, then it will be
// processed.
if (arpPacket.getOpCode() == ARP.OP_REQUEST
&& config.isVirtualGatewayIpAddress(targetIpAddress)) {
MacAddress gatewayMacAddress =
config.getVirtualGatewayMacAddress();
if (gatewayMacAddress == null) {
break;
}
Ethernet eth = ARP.buildArpReply(targetIpAddress,
gatewayMacAddress,
ethPkt);
TrafficTreatment.Builder builder =
DefaultTrafficTreatment.builder();
builder.setOutput(srcConnectPoint.port());
packetService.emit(new DefaultOutboundPacket(
srcConnectPoint.deviceId(),
builder.build(),
ByteBuffer.wrap(eth.serialize())));
}
break;
case IPV4:
// Parse packet
IPv4 ipv4Packet = (IPv4) ethPkt.getPayload();
IpAddress dstIp =
IpAddress.valueOf(ipv4Packet.getDestinationAddress());
IpAddress srcIp =
IpAddress.valueOf(ipv4Packet.getSourceAddress());
MacAddress srcMac = ethPkt.getSourceMAC();
routingService.packetReactiveProcessor(dstIp, srcIp,
srcConnectPoint, srcMac);
// TODO emit packet first or packetReactiveProcessor first
ConnectPoint egressConnectPoint = null;
egressConnectPoint = routingService.getEgressConnectPoint(dstIp);
if (egressConnectPoint != null) {
forwardPacketToDst(context, egressConnectPoint);
}
break;
default:
break;
}
}
}
/**
* Emits the specified packet onto the network.
*
* @param context the packet context
* @param connectPoint the connect point where the packet should be
* sent out
*/
private void forwardPacketToDst(PacketContext context,
ConnectPoint connectPoint) {
TrafficTreatment treatment = DefaultTrafficTreatment.builder()
.setOutput(connectPoint.port()).build();
OutboundPacket packet =
new DefaultOutboundPacket(connectPoint.deviceId(), treatment,
context.inPacket().unparsed());
packetService.emit(packet);
log.trace("sending packet: {}", packet);
}
}
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