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/*
* Copyright 2014-2015 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.proxyarp;
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.Modified;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
import org.onlab.packet.Ethernet;
import org.onlab.packet.ICMP6;
import org.onlab.packet.IPv6;
import org.onosproject.cfg.ComponentConfigService;
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.PacketProcessor;
import org.onosproject.net.packet.PacketService;
import org.onosproject.net.proxyarp.ProxyArpService;
import org.osgi.service.component.ComponentContext;
import org.slf4j.Logger;
import java.util.Dictionary;
import static com.google.common.base.Strings.isNullOrEmpty;
import static org.onlab.packet.Ethernet.TYPE_ARP;
import static org.onlab.packet.Ethernet.TYPE_IPV6;
import static org.onlab.packet.ICMP6.NEIGHBOR_ADVERTISEMENT;
import static org.onlab.packet.ICMP6.NEIGHBOR_SOLICITATION;
import static org.onlab.packet.IPv6.PROTOCOL_ICMP6;
import static org.onosproject.net.packet.PacketPriority.CONTROL;
import static org.slf4j.LoggerFactory.getLogger;
/**
* Sample reactive proxy arp application.
*/
@Component(immediate = true)
public class ProxyArp {
private final Logger log = getLogger(getClass());
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected PacketService packetService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected ProxyArpService proxyArpService;
private ProxyArpProcessor processor = new ProxyArpProcessor();
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected CoreService coreService;
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected ComponentConfigService cfgService;
private ApplicationId appId;
@Property(name = "ipv6NeighborDiscovery", boolValue = false,
label = "Enable IPv6 Neighbor Discovery; default is false")
protected boolean ipv6NeighborDiscovery = false;
@Activate
public void activate(ComponentContext context) {
cfgService.registerProperties(getClass());
appId = coreService.registerApplication("org.onosproject.proxyarp");
packetService.addProcessor(processor, PacketProcessor.director(1));
readComponentConfiguration(context);
requestPackets();
log.info("Started with Application ID {}", appId.id());
}
@Deactivate
public void deactivate() {
cfgService.unregisterProperties(getClass(), false);
withdrawIntercepts();
packetService.removeProcessor(processor);
processor = null;
log.info("Stopped");
}
@Modified
public void modified(ComponentContext context) {
readComponentConfiguration(context);
requestPackets();
}
/**
* Request packet in via PacketService.
*/
private void requestPackets() {
TrafficSelector.Builder selectorBuilder =
DefaultTrafficSelector.builder();
selectorBuilder.matchEthType(TYPE_ARP);
packetService.requestPackets(selectorBuilder.build(),
CONTROL, appId);
selectorBuilder = DefaultTrafficSelector.builder();
selectorBuilder.matchEthType(TYPE_IPV6);
selectorBuilder.matchIPProtocol(PROTOCOL_ICMP6);
selectorBuilder.matchIcmpv6Type(NEIGHBOR_SOLICITATION);
if (ipv6NeighborDiscovery) {
// IPv6 Neighbor Solicitation packet.
packetService.requestPackets(selectorBuilder.build(),
CONTROL, appId);
} else {
packetService.cancelPackets(selectorBuilder.build(),
CONTROL, appId);
}
// IPv6 Neighbor Advertisement packet.
selectorBuilder = DefaultTrafficSelector.builder();
selectorBuilder.matchEthType(TYPE_IPV6);
selectorBuilder.matchIPProtocol(PROTOCOL_ICMP6);
selectorBuilder.matchIcmpv6Type(NEIGHBOR_ADVERTISEMENT);
if (ipv6NeighborDiscovery) {
packetService.requestPackets(selectorBuilder.build(),
CONTROL, appId);
} else {
packetService.cancelPackets(selectorBuilder.build(),
CONTROL, appId);
}
}
/**
* Cancel requested packet in via packet service.
*/
private void withdrawIntercepts() {
TrafficSelector.Builder selectorBuilder =
DefaultTrafficSelector.builder();
selectorBuilder.matchEthType(TYPE_ARP);
packetService.cancelPackets(selectorBuilder.build(), CONTROL, appId);
selectorBuilder = DefaultTrafficSelector.builder();
selectorBuilder.matchEthType(TYPE_IPV6);
selectorBuilder.matchIPProtocol(PROTOCOL_ICMP6);
selectorBuilder.matchIcmpv6Type(NEIGHBOR_SOLICITATION);
packetService.cancelPackets(selectorBuilder.build(), CONTROL, appId);
selectorBuilder = DefaultTrafficSelector.builder();
selectorBuilder.matchEthType(TYPE_IPV6);
selectorBuilder.matchIPProtocol(PROTOCOL_ICMP6);
selectorBuilder.matchIcmpv6Type(NEIGHBOR_ADVERTISEMENT);
packetService.cancelPackets(selectorBuilder.build(), CONTROL, appId);
}
/**
* Extracts properties from the component configuration context.
*
* @param context the component context
*/
private void readComponentConfiguration(ComponentContext context) {
Dictionary<?, ?> properties = context.getProperties();
Boolean flag;
flag = isPropertyEnabled(properties, "ipv6NeighborDiscovery");
if (flag == null) {
log.info("IPv6 Neighbor Discovery is not configured, " +
"using current value of {}", ipv6NeighborDiscovery);
} else {
ipv6NeighborDiscovery = flag;
log.info("Configured. IPv6 Neighbor Discovery is {}",
ipv6NeighborDiscovery ? "enabled" : "disabled");
}
}
/**
* Check property name is defined and set to true.
*
* @param properties properties to be looked up
* @param propertyName the name of the property to look up
* @return value when the propertyName is defined or return null
*/
private static Boolean isPropertyEnabled(Dictionary<?, ?> properties,
String propertyName) {
Boolean value = null;
try {
String s = (String) properties.get(propertyName);
value = isNullOrEmpty(s) ? null : s.trim().equals("true");
} catch (ClassCastException e) {
// No propertyName defined.
value = null;
}
return value;
}
/**
* Packet processor responsible for forwarding packets along their paths.
*/
private class ProxyArpProcessor 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;
}
if (ethPkt.getEtherType() == TYPE_ARP) {
//handle the arp packet.
proxyArpService.handlePacket(context);
} else if (ipv6NeighborDiscovery && ethPkt.getEtherType() == TYPE_IPV6) {
IPv6 ipv6Pkt = (IPv6) ethPkt.getPayload();
if (ipv6Pkt.getNextHeader() == IPv6.PROTOCOL_ICMP6) {
ICMP6 icmp6Pkt = (ICMP6) ipv6Pkt.getPayload();
if (icmp6Pkt.getIcmpType() == NEIGHBOR_SOLICITATION ||
icmp6Pkt.getIcmpType() == NEIGHBOR_ADVERTISEMENT) {
// handle ICMPv6 solicitations and advertisements
proxyArpService.handlePacket(context);
}
}
}
// FIXME why were we listening to IPv4 frames at all?
// Do not ARP for multicast packets. Let mfwd handle them.
if (ethPkt.getEtherType() == Ethernet.TYPE_IPV4) {
if (ethPkt.getDestinationMAC().isMulticast()) {
return;
}
}
}
}
}
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