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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.openflow.controller;
import org.onlab.packet.DeserializationException;
import org.onlab.packet.Ethernet;
import org.projectfloodlight.openflow.protocol.OFPacketIn;
import org.projectfloodlight.openflow.protocol.OFPacketOut;
import org.projectfloodlight.openflow.protocol.OFVersion;
import org.projectfloodlight.openflow.protocol.action.OFAction;
import org.projectfloodlight.openflow.protocol.action.OFActionOutput;
import org.projectfloodlight.openflow.protocol.match.MatchField;
import org.projectfloodlight.openflow.types.OFBufferId;
import org.projectfloodlight.openflow.types.OFPort;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.BufferUnderflowException;
import java.util.Collections;
import java.util.concurrent.atomic.AtomicBoolean;
import static org.onosproject.security.AppGuard.checkPermission;
import static org.onosproject.security.AppPermission.Type.*;
/**
* Default implementation of an OpenFlowPacketContext.
*/
public final class DefaultOpenFlowPacketContext implements OpenFlowPacketContext {
private final AtomicBoolean free = new AtomicBoolean(true);
private final AtomicBoolean isBuilt = new AtomicBoolean(false);
private final OpenFlowSwitch sw;
private final OFPacketIn pktin;
private OFPacketOut pktout = null;
private final boolean isBuffered;
private DefaultOpenFlowPacketContext(OpenFlowSwitch s, OFPacketIn pkt) {
this.sw = s;
this.pktin = pkt;
this.isBuffered = pktin.getBufferId() != OFBufferId.NO_BUFFER;
}
@Override
public void send() {
checkPermission(PACKET_WRITE);
if (block() && isBuilt.get()) {
sw.sendMsg(pktout);
}
}
@Override
public void build(OFPort outPort) {
if (isBuilt.getAndSet(true)) {
return;
}
OFPacketOut.Builder builder = sw.factory().buildPacketOut();
OFAction act = buildOutput(outPort.getPortNumber());
pktout = builder.setXid(pktin.getXid())
.setInPort(pktinInPort())
.setBufferId(OFBufferId.NO_BUFFER)
.setData(pktin.getData())
// .setBufferId(pktin.getBufferId())
.setActions(Collections.singletonList(act))
.build();
}
@Override
public void build(Ethernet ethFrame, OFPort outPort) {
if (isBuilt.getAndSet(true)) {
return;
}
OFPacketOut.Builder builder = sw.factory().buildPacketOut();
OFAction act = buildOutput(outPort.getPortNumber());
pktout = builder.setXid(pktin.getXid())
.setBufferId(OFBufferId.NO_BUFFER)
.setInPort(pktinInPort())
.setActions(Collections.singletonList(act))
.setData(ethFrame.serialize())
.build();
}
@Override
public Ethernet parsed() {
checkPermission(PACKET_READ);
try {
return Ethernet.deserializer().deserialize(pktin.getData(), 0, pktin.getData().length);
} catch (BufferUnderflowException | NullPointerException |
DeserializationException e) {
Logger log = LoggerFactory.getLogger(getClass());
log.error("packet deserialization problem : {}", e.getMessage());
return null;
}
}
@Override
public Dpid dpid() {
checkPermission(PACKET_READ);
return new Dpid(sw.getId());
}
/**
* Creates an OpenFlow packet context based on a packet-in.
*
* @param s OpenFlow switch
* @param pkt OpenFlow packet-in
* @return the OpenFlow packet context
*/
public static OpenFlowPacketContext packetContextFromPacketIn(OpenFlowSwitch s,
OFPacketIn pkt) {
return new DefaultOpenFlowPacketContext(s, pkt);
}
@Override
public Integer inPort() {
checkPermission(PACKET_READ);
return pktinInPort().getPortNumber();
}
private OFPort pktinInPort() {
if (pktin.getVersion() == OFVersion.OF_10) {
return pktin.getInPort();
}
return pktin.getMatch().get(MatchField.IN_PORT);
}
@Override
public byte[] unparsed() {
checkPermission(PACKET_READ);
return pktin.getData().clone();
}
private OFActionOutput buildOutput(Integer port) {
OFActionOutput act = sw.factory().actions()
.buildOutput()
.setPort(OFPort.of(port))
.build();
return act;
}
@Override
public boolean block() {
checkPermission(PACKET_WRITE);
return free.getAndSet(false);
}
@Override
public boolean isHandled() {
checkPermission(PACKET_READ);
return !free.get();
}
@Override
public boolean isBuffered() {
checkPermission(PACKET_READ);
return isBuffered;
}
}
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