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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.pim.impl;
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.MacAddress;
import org.onlab.packet.PIM;
import org.onlab.packet.VlanId;
import org.onosproject.core.ApplicationId;
import org.onosproject.incubator.net.intf.Interface;
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.PacketPriority;
import org.onosproject.net.packet.PacketProcessor;
import org.onosproject.net.packet.PacketService;
import org.slf4j.Logger;
import java.nio.ByteBuffer;
import static com.google.common.base.Preconditions.checkNotNull;
import static org.slf4j.LoggerFactory.getLogger;
/**
* Handing Incoming and outgoing PIM packets.
*/
public final class PIMPacketHandler {
private final Logger log = getLogger(getClass());
private static PIMPacketHandler instance = null;
private PacketService packetService;
private PIMPacketProcessor processor = new PIMPacketProcessor();
private MacAddress pimDestinationMac = MacAddress.valueOf("01:00:5E:00:00:0d");
// Utility class
private PIMPacketHandler() {}
public static PIMPacketHandler getInstance() {
if (null == instance) {
instance = new PIMPacketHandler();
}
return instance;
}
/**
* Initialize the packet handling service.
*
* @param ps the packetService
* @param appId our application ID
*/
public void initialize(PacketService ps, ApplicationId appId) {
packetService = ps;
// Build a traffic selector for all multicast traffic
TrafficSelector.Builder selector = DefaultTrafficSelector.builder();
selector.matchEthType(Ethernet.TYPE_IPV4);
selector.matchIPProtocol(IPv4.PROTOCOL_PIM);
packetService.requestPackets(selector.build(), PacketPriority.REACTIVE, appId);
packetService.addProcessor(processor, PacketProcessor.director(1));
}
/**
* Shutdown the packet handling service.
*/
public void stop() {
packetService.removeProcessor(processor);
processor = null;
}
/**
* Packet processor responsible for handling IGMP packets.
*/
public class PIMPacketProcessor implements PacketProcessor {
private final Logger log = getLogger(getClass());
@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();
if (pkt == null) {
return;
}
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_PIM) {
log.debug("PIM Picked up a non PIM packet: IP protocol: " + ip.getProtocol());
return;
}
// TODO: check incoming to be PIM.PIM_ADDRESS or "Our" address.
IpPrefix spfx = IpPrefix.valueOf(saddr, 32);
IpPrefix gpfx = IpPrefix.valueOf(gaddr, 32);
PIM pim = (PIM) ip.getPayload();
switch (pim.getPimMsgType()) {
case PIM.TYPE_HELLO:
processHello(ethPkt, context.inPacket().receivedFrom());
break;
case PIM.TYPE_JOIN_PRUNE_REQUEST:
// Create the function
break;
case PIM.TYPE_ASSERT:
case PIM.TYPE_BOOTSTRAP:
case PIM.TYPE_CANDIDATE_RP_ADV:
case PIM.TYPE_GRAFT:
case PIM.TYPE_GRAFT_ACK:
case PIM.TYPE_REGISTER:
case PIM.TYPE_REGISTER_STOP:
log.debug("Unsupported PIM message type: " + pim.getPimMsgType());
break;
default:
log.debug("Unkown PIM message type: " + pim.getPimMsgType());
break;
}
}
/**
* Process incoming hello message, we will need the Macaddress and IP address of the sender.
*
* @param ethPkt the ethernet header
* @param receivedFrom the connect point we recieved this message from
*/
private void processHello(Ethernet ethPkt, ConnectPoint receivedFrom) {
checkNotNull(ethPkt);
checkNotNull(receivedFrom);
// It is a problem if we don't have the
PIMInterfaces pintfs = PIMInterfaces.getInstance();
PIMInterface intf = pintfs.getInterface(receivedFrom);
if (intf == null) {
log.error("We received a PIM message on an interface we were not supposed to");
return;
}
intf.processHello(ethPkt, receivedFrom);
}
}
// Create an ethernet header and serialize then send
public void sendPacket(PIM pim, PIMInterface pimIntf) {
Interface theInterface = pimIntf.getInterface();
// Create the ethernet packet
Ethernet eth = new Ethernet();
eth.setDestinationMACAddress(pimDestinationMac);
eth.setSourceMACAddress(theInterface.mac());
eth.setEtherType(Ethernet.TYPE_IPV4);
if (theInterface.vlan() != VlanId.NONE) {
eth.setVlanID(theInterface.vlan().toShort());
}
// Create the IP Packet
IPv4 ip = new IPv4();
ip.setVersion((byte) 4);
ip.setTtl((byte) 20);
ip.setProtocol(IPv4.PROTOCOL_PIM);
ip.setChecksum((short) 0);
ip.setSourceAddress(checkNotNull(pimIntf.getIpAddress()).getIp4Address().toInt());
ip.setDestinationAddress(PIM.PIM_ADDRESS.getIp4Address().toInt());
eth.setPayload(ip);
ip.setParent(eth);
// Now set pim
ip.setPayload(pim);
pim.setParent(ip);
ConnectPoint cp = theInterface.connectPoint();
checkNotNull(cp);
TrafficTreatment treat = DefaultTrafficTreatment.builder().setOutput(cp.port()).build();
ByteBuffer bb = ByteBuffer.wrap(eth.serialize());
OutboundPacket packet = new DefaultOutboundPacket(cp.deviceId(), treat, bb);
checkNotNull(packet);
packetService.emit(packet);
}
}
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