Refactored LLDP link discovery to be shared by multiple providers
Change-Id: Ia2253ff6bb39186e936ddbaff0c416aa5be6e117
diff --git a/providers/lldpcommon/src/main/java/org/onosproject/provider/lldpcommon/LinkDiscovery.java b/providers/lldpcommon/src/main/java/org/onosproject/provider/lldpcommon/LinkDiscovery.java
new file mode 100644
index 0000000..125df58
--- /dev/null
+++ b/providers/lldpcommon/src/main/java/org/onosproject/provider/lldpcommon/LinkDiscovery.java
@@ -0,0 +1,297 @@
+/*
+ * 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.provider.lldpcommon;
+
+import com.google.common.collect.Sets;
+
+import org.jboss.netty.util.Timeout;
+import org.jboss.netty.util.TimerTask;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.ONOSLLDP;
+import org.onlab.util.Timer;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Link.Type;
+import org.onosproject.net.LinkKey;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.link.DefaultLinkDescription;
+import org.onosproject.net.link.LinkDescription;
+import org.onosproject.net.packet.DefaultOutboundPacket;
+import org.onosproject.net.packet.OutboundPacket;
+import org.onosproject.net.packet.PacketContext;
+import org.slf4j.Logger;
+
+import java.nio.ByteBuffer;
+import java.util.Set;
+
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+import static org.onosproject.net.PortNumber.portNumber;
+import static org.onosproject.net.flow.DefaultTrafficTreatment.builder;
+import static org.slf4j.LoggerFactory.getLogger;
+import static org.onosproject.cluster.ClusterMetadata.NO_NAME;
+
+/**
+ * Run discovery process from a physical switch. Ports are initially labeled as
+ * slow ports. When an LLDP is successfully received, label the remote port as
+ * fast. Every probeRate milliseconds, loop over all fast ports and send an
+ * LLDP, send an LLDP for a single slow port. Based on FlowVisor topology
+ * discovery implementation.
+ */
+public class LinkDiscovery implements TimerTask {
+
+ private final Logger log = getLogger(getClass());
+
+ private static final String SRC_MAC = "DE:AD:BE:EF:BA:11";
+
+ private final Device device;
+ private final LinkDiscoveryContext context;
+
+ private final Ethernet ethPacket;
+ private final Ethernet bddpEth;
+
+ private Timeout timeout;
+ private volatile boolean isStopped;
+ // This LinkDiscovery can handle remote link probes (default false).
+ private volatile boolean fingerprinted;
+ // Set of ports to be probed
+ private final Set<Long> ports = Sets.newConcurrentHashSet();
+
+ /**
+ * Instantiates discovery manager for the given physical switch. Creates a
+ * generic LLDP packet that will be customized for the port it is sent out on.
+ * Starts the the timer for the discovery process.
+ *
+ * @param device the physical switch
+ * @param context discovery context
+ */
+ public LinkDiscovery(Device device, LinkDiscoveryContext context) {
+ this.device = device;
+ this.context = context;
+
+ ethPacket = new Ethernet();
+ ethPacket.setEtherType(Ethernet.TYPE_LLDP);
+ ethPacket.setDestinationMACAddress(ONOSLLDP.LLDP_NICIRA);
+ ethPacket.setPad(true);
+
+ bddpEth = new Ethernet();
+ bddpEth.setEtherType(Ethernet.TYPE_BSN);
+ bddpEth.setDestinationMACAddress(ONOSLLDP.BDDP_MULTICAST);
+ bddpEth.setPad(true);
+
+ fingerprinted = false;
+ isStopped = true;
+ start();
+ log.debug("Started discovery manager for switch {}", device.id());
+
+ }
+
+ public synchronized void stop() {
+ if (!isStopped) {
+ isStopped = true;
+ timeout.cancel();
+ } else {
+ log.warn("LinkDiscovery stopped multiple times?");
+ }
+ }
+
+ public synchronized void start() {
+ if (isStopped) {
+ isStopped = false;
+ timeout = Timer.getTimer().newTimeout(this, 0, MILLISECONDS);
+ } else {
+ log.warn("LinkDiscovery started multiple times?");
+ }
+ }
+
+ public synchronized boolean isStopped() {
+ return isStopped || timeout.isCancelled();
+ }
+
+ /**
+ * Add physical port to discovery process.
+ * Send out initial LLDP and label it as slow port.
+ *
+ * @param port the port
+ */
+ public void addPort(Port port) {
+ boolean newPort = ports.add(port.number().toLong());
+ boolean isMaster = context.mastershipService().isLocalMaster(device.id());
+ if (newPort && isMaster) {
+ log.debug("Sending initial probe to port {}@{}", port.number().toLong(), device.id());
+ sendProbes(port.number().toLong());
+ }
+ }
+
+ /**
+ * removed physical port from discovery process.
+ * @param port the port number
+ */
+ public void removePort(PortNumber port) {
+ ports.remove(port.toLong());
+ }
+
+ /**
+ * Handles an incoming LLDP packet. Creates link in topology and adds the
+ * link for staleness tracking.
+ *
+ * @param packetContext packet context
+ * @return true if handled
+ */
+ public boolean handleLldp(PacketContext packetContext) {
+ Ethernet eth = packetContext.inPacket().parsed();
+ if (eth == null) {
+ return false;
+ }
+
+ ONOSLLDP onoslldp = ONOSLLDP.parseONOSLLDP(eth);
+ if (onoslldp != null) {
+ if (notMy(onoslldp)) {
+ return true;
+ }
+
+ PortNumber srcPort = portNumber(onoslldp.getPort());
+ PortNumber dstPort = packetContext.inPacket().receivedFrom().port();
+ DeviceId srcDeviceId = DeviceId.deviceId(onoslldp.getDeviceString());
+ DeviceId dstDeviceId = packetContext.inPacket().receivedFrom().deviceId();
+
+ ConnectPoint src = new ConnectPoint(srcDeviceId, srcPort);
+ ConnectPoint dst = new ConnectPoint(dstDeviceId, dstPort);
+
+ LinkDescription ld = eth.getEtherType() == Ethernet.TYPE_LLDP ?
+ new DefaultLinkDescription(src, dst, Type.DIRECT) :
+ new DefaultLinkDescription(src, dst, Type.INDIRECT);
+
+ try {
+ context.providerService().linkDetected(ld);
+ context.touchLink(LinkKey.linkKey(src, dst));
+ } catch (IllegalStateException e) {
+ return true;
+ }
+ return true;
+ }
+ return false;
+ }
+
+ // true if *NOT* this cluster's own probe.
+ private boolean notMy(ONOSLLDP onoslldp) {
+ if (onoslldp.getDomainTLV() == null) {
+ // not finger-printed - but we can check the source
+ DeviceId src = DeviceId.deviceId(onoslldp.getDeviceString());
+ if (context.deviceService().getDevice(src) == null) {
+ return true;
+ }
+ return false;
+ }
+
+ String us = context.fingerprint();
+ String them = onoslldp.getDomainString();
+ // if: Our and/or their MetadataService in poorly state, conservative 'yes'
+ if (NO_NAME.equals(us) || NO_NAME.equals(them)) {
+ return true;
+ } else {
+ return !us.equals(them);
+ }
+ }
+
+ /**
+ * Execute this method every t milliseconds. Loops over all ports
+ * labeled as fast and sends out an LLDP. Send out an LLDP on a single slow
+ * port.
+ *
+ * @param t timeout
+ */
+ @Override
+ public void run(Timeout t) {
+ if (isStopped()) {
+ return;
+ }
+
+ if (context.mastershipService().isLocalMaster(device.id())) {
+ log.trace("Sending probes from {}", device.id());
+ ports.forEach(this::sendProbes);
+ }
+
+ if (!isStopped()) {
+ timeout = Timer.getTimer().newTimeout(this, context.probeRate(), MILLISECONDS);
+ }
+ }
+
+ /**
+ * Creates packet_out LLDP for specified output port.
+ *
+ * @param port the port
+ * @return Packet_out message with LLDP data
+ */
+ private OutboundPacket createOutBoundLldp(Long port) {
+ if (port == null) {
+ return null;
+ }
+ ONOSLLDP lldp = getLinkProbe(port);
+ ethPacket.setSourceMACAddress(SRC_MAC).setPayload(lldp);
+ return new DefaultOutboundPacket(device.id(),
+ builder().setOutput(portNumber(port)).build(),
+ ByteBuffer.wrap(ethPacket.serialize()));
+ }
+
+ /**
+ * Creates packet_out BDDP for specified output port.
+ *
+ * @param port the port
+ * @return Packet_out message with LLDP data
+ */
+ private OutboundPacket createOutBoundBddp(Long port) {
+ if (port == null) {
+ return null;
+ }
+ ONOSLLDP lldp = getLinkProbe(port);
+ bddpEth.setSourceMACAddress(SRC_MAC).setPayload(lldp);
+ return new DefaultOutboundPacket(device.id(),
+ builder().setOutput(portNumber(port)).build(),
+ ByteBuffer.wrap(bddpEth.serialize()));
+ }
+
+ private ONOSLLDP getLinkProbe(Long port) {
+ return fingerprinted
+ ? ONOSLLDP.fingerprintedLLDP(device.id().toString(), device.chassisId(),
+ port.intValue(), context.fingerprint())
+ : ONOSLLDP.onosLLDP(device.id().toString(), device.chassisId(),
+ port.intValue());
+ }
+
+ private void sendProbes(Long portNumber) {
+ log.trace("Sending probes out to {}@{}", portNumber, device.id());
+ OutboundPacket pkt = createOutBoundLldp(portNumber);
+ context.packetService().emit(pkt);
+ if (context.useBddp()) {
+ OutboundPacket bpkt = createOutBoundBddp(portNumber);
+ context.packetService().emit(bpkt);
+ }
+ }
+
+ public boolean containsPort(long portNumber) {
+ return ports.contains(portNumber);
+ }
+
+ public void enableFingerprint() {
+ fingerprinted = true;
+ }
+
+ public void disableFingerprint() {
+ fingerprinted = false;
+ }
+}