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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.segmentrouting;
import org.onlab.packet.Ethernet;
import org.onlab.packet.IPv4;
import org.onlab.packet.Ip4Address;
import org.onosproject.net.ConnectPoint;
import org.onosproject.net.DeviceId;
import org.onosproject.net.Host;
import org.onosproject.net.flow.DefaultTrafficTreatment;
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.segmentrouting.config.DeviceConfigNotFoundException;
import org.onosproject.segmentrouting.config.DeviceConfiguration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.ByteBuffer;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import static com.google.common.base.Preconditions.checkNotNull;
public class IpHandler {
private static Logger log = LoggerFactory.getLogger(IpHandler.class);
private SegmentRoutingManager srManager;
private DeviceConfiguration config;
private ConcurrentHashMap<Ip4Address, ConcurrentLinkedQueue<IPv4>> ipPacketQueue;
/**
* Creates an IpHandler object.
*
* @param srManager SegmentRoutingManager object
*/
public IpHandler(SegmentRoutingManager srManager) {
this.srManager = srManager;
this.config = checkNotNull(srManager.deviceConfiguration);
ipPacketQueue = new ConcurrentHashMap<>();
}
/**
* Processes incoming IP packets.
*
* If it is an IP packet for known host, then forward it to the host.
* If it is an IP packet for unknown host in subnet, then send an ARP request
* to the subnet.
*
* @param pkt incoming packet
*/
public void processPacketIn(InboundPacket pkt) {
Ethernet ethernet = pkt.parsed();
IPv4 ipv4 = (IPv4) ethernet.getPayload();
ConnectPoint connectPoint = pkt.receivedFrom();
DeviceId deviceId = connectPoint.deviceId();
Ip4Address destinationAddress =
Ip4Address.valueOf(ipv4.getDestinationAddress());
// IP packet for know hosts
if (!srManager.hostService.getHostsByIp(destinationAddress).isEmpty()) {
forwardPackets(deviceId, destinationAddress);
// IP packet for unknown host in the subnet of the router
} else if (config.inSameSubnet(deviceId, destinationAddress)) {
srManager.arpHandler.sendArpRequest(deviceId, destinationAddress, connectPoint);
// IP packets for unknown host
} else {
log.debug("ICMP request for unknown host {} which is not in the subnet",
destinationAddress);
// Do nothing
}
}
/**
* Adds the IP packet to a buffer.
* The packets are forwarded to corresponding destination when the destination
* MAC address is known via ARP response.
*
* @param ipPacket IP packet to add to the buffer
*/
public void addToPacketBuffer(IPv4 ipPacket) {
// Better not buffer TPC packets due to out-of-order packet transfer
if (ipPacket.getProtocol() == IPv4.PROTOCOL_TCP) {
return;
}
Ip4Address destIpAddress = Ip4Address.valueOf(ipPacket.getDestinationAddress());
if (ipPacketQueue.get(destIpAddress) == null) {
ConcurrentLinkedQueue<IPv4> queue = new ConcurrentLinkedQueue<>();
queue.add(ipPacket);
ipPacketQueue.put(destIpAddress, queue);
} else {
ipPacketQueue.get(destIpAddress).add(ipPacket);
}
}
/**
* Forwards IP packets in the buffer to the destination IP address.
* It is called when the controller finds the destination MAC address
* via ARP responses.
*
* @param deviceId switch device ID
* @param destIpAddress destination IP address
*/
public void forwardPackets(DeviceId deviceId, Ip4Address destIpAddress) {
if (ipPacketQueue.get(destIpAddress) == null) {
return;
}
for (IPv4 ipPacket : ipPacketQueue.get(destIpAddress)) {
Ip4Address destAddress = Ip4Address.valueOf(ipPacket.getDestinationAddress());
if (config.inSameSubnet(deviceId, destAddress)) {
ipPacket.setTtl((byte) (ipPacket.getTtl() - 1));
ipPacket.setChecksum((short) 0);
for (Host dest: srManager.hostService.getHostsByIp(destIpAddress)) {
Ethernet eth = new Ethernet();
eth.setDestinationMACAddress(dest.mac());
try {
eth.setSourceMACAddress(config.getDeviceMac(deviceId));
} catch (DeviceConfigNotFoundException e) {
log.warn(e.getMessage()
+ " Skipping forwardPackets for this destination.");
continue;
}
eth.setEtherType(Ethernet.TYPE_IPV4);
eth.setPayload(ipPacket);
TrafficTreatment treatment = DefaultTrafficTreatment.builder().
setOutput(dest.location().port()).build();
OutboundPacket packet = new DefaultOutboundPacket(deviceId,
treatment, ByteBuffer.wrap(eth.serialize()));
srManager.packetService.emit(packet);
ipPacketQueue.get(destIpAddress).remove(ipPacket);
}
ipPacketQueue.get(destIpAddress).remove(ipPacket);
}
}
}
}
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