/**
* Copyright 2011, Big Switch Networks, Inc.
* Originally created by David Erickson, Stanford University
*
* 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 net.floodlightcontroller.linkdiscovery.internal;
import java.io.IOException;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import net.floodlightcontroller.core.FloodlightContext;
import net.floodlightcontroller.core.HAListenerTypeMarker;
import net.floodlightcontroller.core.IFloodlightProviderService;
import net.floodlightcontroller.core.IFloodlightProviderService.Role;
import net.floodlightcontroller.core.IHAListener;
import net.floodlightcontroller.core.IInfoProvider;
import net.floodlightcontroller.core.IOFMessageListener;
import net.floodlightcontroller.core.IOFSwitch;
import net.floodlightcontroller.core.IOFSwitchListener;
import net.floodlightcontroller.core.ImmutablePort;
import net.floodlightcontroller.core.annotations.LogMessageCategory;
import net.floodlightcontroller.core.annotations.LogMessageDoc;
import net.floodlightcontroller.core.annotations.LogMessageDocs;
import net.floodlightcontroller.core.module.FloodlightModuleContext;
import net.floodlightcontroller.core.module.FloodlightModuleException;
import net.floodlightcontroller.core.module.IFloodlightModule;
import net.floodlightcontroller.core.module.IFloodlightService;
import net.floodlightcontroller.core.util.SingletonTask;
import net.floodlightcontroller.debugcounter.IDebugCounter;
import net.floodlightcontroller.debugcounter.IDebugCounterService;
import net.floodlightcontroller.debugcounter.IDebugCounterService.CounterException;
import net.floodlightcontroller.debugcounter.IDebugCounterService.CounterType;
import net.floodlightcontroller.debugcounter.NullDebugCounter;
import net.floodlightcontroller.debugevent.IDebugEventService;
import net.floodlightcontroller.debugevent.IDebugEventService.EventColumn;
import net.floodlightcontroller.debugevent.IDebugEventService.EventFieldType;
import net.floodlightcontroller.debugevent.IDebugEventService.MaxEventsRegistered;
import net.floodlightcontroller.debugevent.IEventUpdater;
import net.floodlightcontroller.debugevent.NullDebugEvent;
import net.floodlightcontroller.debugevent.IDebugEventService.EventType;
import net.floodlightcontroller.linkdiscovery.ILinkDiscovery;
import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.LDUpdate;
import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.LinkType;
import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.SwitchType;
import net.floodlightcontroller.linkdiscovery.ILinkDiscovery.UpdateOperation;
import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryListener;
import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;
import net.floodlightcontroller.linkdiscovery.LinkInfo;
import net.floodlightcontroller.linkdiscovery.web.LinkDiscoveryWebRoutable;
import net.floodlightcontroller.notification.INotificationManager;
import net.floodlightcontroller.notification.NotificationManagerFactory;
import net.floodlightcontroller.packet.BSN;
import net.floodlightcontroller.packet.Ethernet;
import net.floodlightcontroller.packet.LLDP;
import net.floodlightcontroller.packet.LLDPTLV;
import net.floodlightcontroller.restserver.IRestApiService;
import net.floodlightcontroller.routing.Link;
import net.floodlightcontroller.storage.IResultSet;
import net.floodlightcontroller.storage.IStorageSourceListener;
import net.floodlightcontroller.storage.IStorageSourceService;
import net.floodlightcontroller.storage.OperatorPredicate;
import net.floodlightcontroller.storage.StorageException;
import net.floodlightcontroller.threadpool.IThreadPoolService;
import net.floodlightcontroller.topology.NodePortTuple;
import org.openflow.protocol.OFMessage;
import org.openflow.protocol.OFPacketIn;
import org.openflow.protocol.OFPacketOut;
import org.openflow.protocol.OFPhysicalPort;
import org.openflow.protocol.OFPhysicalPort.OFPortState;
import org.openflow.protocol.OFPort;
import org.openflow.protocol.OFType;
import org.openflow.protocol.action.OFAction;
import org.openflow.protocol.action.OFActionOutput;
import org.openflow.util.HexString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class sends out LLDP messages containing the sending switch's datapath
* id as well as the outgoing port number. Received LLrescDP messages that match
* a known switch cause a new LinkTuple to be created according to the invariant
* rules listed below. This new LinkTuple is also passed to routing if it exists
* to trigger updates. This class also handles removing links that are
* associated to switch ports that go down, and switches that are disconnected.
* Invariants: -portLinks and switchLinks will not contain empty Sets outside of
* critical sections -portLinks contains LinkTuples where one of the src or dst
* SwitchPortTuple matches the map key -switchLinks contains LinkTuples where
* one of the src or dst SwitchPortTuple's id matches the switch id -Each
* LinkTuple will be indexed into switchLinks for both src.id and dst.id, and
* portLinks for each src and dst -The updates queue is only added to from
* within a held write lock
*/
@LogMessageCategory("Network Topology")
public class LinkDiscoveryManager implements IOFMessageListener,
IOFSwitchListener, IStorageSourceListener, ILinkDiscoveryService,
IFloodlightModule, IInfoProvider {
protected static final Logger log = LoggerFactory.getLogger(LinkDiscoveryManager.class);
protected static final INotificationManager notifier =
NotificationManagerFactory.getNotificationManager(LinkDiscoveryManager.class);
public static final String MODULE_NAME = "linkdiscovery";
// Names of table/fields for links in the storage API
private static final String TOPOLOGY_TABLE_NAME = "controller_topologyconfig";
private static final String TOPOLOGY_ID = "id";
private static final String TOPOLOGY_AUTOPORTFAST = "autoportfast";
private static final String LINK_TABLE_NAME = "controller_link";
private static final String LINK_ID = "id";
private static final String LINK_SRC_SWITCH = "src_switch_id";
private static final String LINK_SRC_PORT = "src_port";
private static final String LINK_DST_SWITCH = "dst_switch_id";
private static final String LINK_DST_PORT = "dst_port";
private static final String LINK_VALID_TIME = "valid_time";
private static final String LINK_TYPE = "link_type";
private static final String SWITCH_CONFIG_TABLE_NAME = "controller_switchconfig";
private static final String SWITCH_CONFIG_CORE_SWITCH = "core_switch";
// Event updaters for debug events
protected IEventUpdater<DirectLinkEvent> evDirectLink;
protected IFloodlightProviderService floodlightProvider;
protected IStorageSourceService storageSource;
protected IThreadPoolService threadPool;
protected IRestApiService restApi;
protected IDebugCounterService debugCounters;
protected IDebugEventService debugEvents;
// Role
protected Role role;
// LLDP and BDDP fields
private static final byte[] LLDP_STANDARD_DST_MAC_STRING =
HexString.fromHexString("01:80:c2:00:00:0e");
private static final long LINK_LOCAL_MASK = 0xfffffffffff0L;
private static final long LINK_LOCAL_VALUE = 0x0180c2000000L;
protected static int EVENT_HISTORY_SIZE = 1024; // in seconds
// BigSwitch OUI is 5C:16:C7, so 5D:16:C7 is the multicast version
// private static final String LLDP_BSN_DST_MAC_STRING =
// "5d:16:c7:00:00:01";
private static final String LLDP_BSN_DST_MAC_STRING = "ff:ff:ff:ff:ff:ff";
// Direction TLVs are used to indicate if the LLDPs were sent
// periodically or in response to a recieved LLDP
private static final byte TLV_DIRECTION_TYPE = 0x73;
private static final short TLV_DIRECTION_LENGTH = 1; // 1 byte
private static final byte TLV_DIRECTION_VALUE_FORWARD[] = { 0x01 };
private static final byte TLV_DIRECTION_VALUE_REVERSE[] = { 0x02 };
private static final LLDPTLV forwardTLV = new LLDPTLV().setType(TLV_DIRECTION_TYPE)
.setLength(TLV_DIRECTION_LENGTH)
.setValue(TLV_DIRECTION_VALUE_FORWARD);
private static final LLDPTLV reverseTLV = new LLDPTLV().setType(TLV_DIRECTION_TYPE)
.setLength(TLV_DIRECTION_LENGTH)
.setValue(TLV_DIRECTION_VALUE_REVERSE);
// Link discovery task details.
protected SingletonTask discoveryTask;
protected final int DISCOVERY_TASK_INTERVAL = 1;
protected final int LINK_TIMEOUT = 35; // timeout as part of LLDP process.
protected final int LLDP_TO_ALL_INTERVAL = 15; // 15 seconds.
protected long lldpClock = 0;
// This value is intentionally kept higher than LLDP_TO_ALL_INTERVAL.
// If we want to identify link failures faster, we could decrease this
// value to a small number, say 1 or 2 sec.
protected final int LLDP_TO_KNOWN_INTERVAL = 20; // LLDP frequency for known
// links
protected LLDPTLV controllerTLV;
protected ReentrantReadWriteLock lock;
int lldpTimeCount = 0;
/**
* Flag to indicate if automatic port fast is enabled or not. Default is set
* to false -- Initialized in the init method as well.
*/
protected boolean AUTOPORTFAST_DEFAULT = false;
protected boolean autoPortFastFeature = AUTOPORTFAST_DEFAULT;
/**
* Map from link to the most recent time it was verified functioning
*/
protected Map<Link, LinkInfo> links;
/**
* Map from switch id to a set of all links with it as an endpoint
*/
protected Map<Long, Set<Link>> switchLinks;
/**
* Map from a id:port to the set of links containing it as an endpoint
*/
protected Map<NodePortTuple, Set<Link>> portLinks;
protected volatile boolean shuttingDown = false;
/*
* topology aware components are called in the order they were added to the
* the array
*/
protected ArrayList<ILinkDiscoveryListener> linkDiscoveryAware;
protected BlockingQueue<LDUpdate> updates;
protected Thread updatesThread;
/**
* List of ports through which LLDP/BDDPs are not sent.
*/
protected Set<NodePortTuple> suppressLinkDiscovery;
/**
* A list of ports that are quarantined for discovering links through them.
* Data traffic from these ports are not allowed until the ports are
* released from quarantine.
*/
protected LinkedBlockingQueue<NodePortTuple> quarantineQueue;
protected LinkedBlockingQueue<NodePortTuple> maintenanceQueue;
/**
* Quarantine task
*/
protected SingletonTask bddpTask;
protected final int BDDP_TASK_INTERVAL = 100; // 100 ms.
protected final int BDDP_TASK_SIZE = 10; // # of ports per iteration
private class MACRange {
long baseMAC;
int ignoreBits;
}
protected Set<MACRange> ignoreMACSet;
private IHAListener haListener;
/**
* Debug Counters
*/
private IDebugCounter ctrQuarantineDrops;
private IDebugCounter ctrIgnoreSrcMacDrops;
private IDebugCounter ctrIncoming;
private IDebugCounter ctrLinkLocalDrops;
private IDebugCounter ctrLldpEol;
private final String PACKAGE = LinkDiscoveryManager.class.getPackage().getName();
//*********************
// ILinkDiscoveryService
//*********************
@Override
public OFPacketOut generateLLDPMessage(long sw, short port,
boolean isStandard, boolean isReverse) {
IOFSwitch iofSwitch = floodlightProvider.getSwitch(sw);
ImmutablePort ofpPort = iofSwitch.getPort(port);
if (log.isTraceEnabled()) {
log.trace("Sending LLDP packet out of swich: {}, port: {}",
HexString.toHexString(sw), port);
}
// using "nearest customer bridge" MAC address for broadest possible
// propagation
// through provider and TPMR bridges (see IEEE 802.1AB-2009 and
// 802.1Q-2011),
// in particular the Linux bridge which behaves mostly like a provider
// bridge
byte[] chassisId = new byte[] { 4, 0, 0, 0, 0, 0, 0 }; // filled in
// later
byte[] portId = new byte[] { 2, 0, 0 }; // filled in later
byte[] ttlValue = new byte[] { 0, 0x78 };
// OpenFlow OUI - 00-26-E1
byte[] dpidTLVValue = new byte[] { 0x0, 0x26, (byte) 0xe1, 0, 0, 0,
0, 0, 0, 0, 0, 0 };
LLDPTLV dpidTLV = new LLDPTLV().setType((byte) 127)
.setLength((short) dpidTLVValue.length)
.setValue(dpidTLVValue);
byte[] dpidArray = new byte[8];
ByteBuffer dpidBB = ByteBuffer.wrap(dpidArray);
ByteBuffer portBB = ByteBuffer.wrap(portId, 1, 2);
Long dpid = sw;
dpidBB.putLong(dpid);
// set the chassis id's value to last 6 bytes of dpid
System.arraycopy(dpidArray, 2, chassisId, 1, 6);
// set the optional tlv to the full dpid
System.arraycopy(dpidArray, 0, dpidTLVValue, 4, 8);
// TODO: Consider remove this block of code.
// It's evil to overwrite port object. The the old code always
// overwrote mac address, we now only overwrite zero macs and
// log a warning, mostly for paranoia.
byte[] srcMac = ofpPort.getHardwareAddress();
byte[] zeroMac = { 0, 0, 0, 0, 0, 0 };
if (Arrays.equals(srcMac, zeroMac)) {
log.warn("Port {}/{} has zero hareware address"
+ "overwrite with lower 6 bytes of dpid",
HexString.toHexString(dpid), ofpPort.getPortNumber());
System.arraycopy(dpidArray, 2, srcMac, 0, 6);
}
// set the portId to the outgoing port
portBB.putShort(port);
if (log.isTraceEnabled()) {
log.trace("Sending LLDP out of interface: {}/{}",
HexString.toHexString(sw), port);
}
LLDP lldp = new LLDP();
lldp.setChassisId(new LLDPTLV().setType((byte) 1)
.setLength((short) chassisId.length)
.setValue(chassisId));
lldp.setPortId(new LLDPTLV().setType((byte) 2)
.setLength((short) portId.length)
.setValue(portId));
lldp.setTtl(new LLDPTLV().setType((byte) 3)
.setLength((short) ttlValue.length)
.setValue(ttlValue));
lldp.getOptionalTLVList().add(dpidTLV);
// Add the controller identifier to the TLV value.
lldp.getOptionalTLVList().add(controllerTLV);
if (isReverse) {
lldp.getOptionalTLVList().add(reverseTLV);
} else {
lldp.getOptionalTLVList().add(forwardTLV);
}
Ethernet ethernet;
if (isStandard) {
ethernet = new Ethernet().setSourceMACAddress(ofpPort.getHardwareAddress())
.setDestinationMACAddress(LLDP_STANDARD_DST_MAC_STRING)
.setEtherType(Ethernet.TYPE_LLDP);
ethernet.setPayload(lldp);
} else {
BSN bsn = new BSN(BSN.BSN_TYPE_BDDP);
bsn.setPayload(lldp);
ethernet = new Ethernet().setSourceMACAddress(ofpPort.getHardwareAddress())
.setDestinationMACAddress(LLDP_BSN_DST_MAC_STRING)
.setEtherType(Ethernet.TYPE_BSN);
ethernet.setPayload(bsn);
}
// serialize and wrap in a packet out
byte[] data = ethernet.serialize();
OFPacketOut po = (OFPacketOut) floodlightProvider.getOFMessageFactory()
.getMessage(OFType.PACKET_OUT);
po.setBufferId(OFPacketOut.BUFFER_ID_NONE);
po.setInPort(OFPort.OFPP_NONE);
// set data and data length
po.setLengthU(OFPacketOut.MINIMUM_LENGTH + data.length);
po.setPacketData(data);
return po;
}
/**
* Get the LLDP sending period in seconds.
*
* @return LLDP sending period in seconds.
*/
public int getLldpFrequency() {
return LLDP_TO_KNOWN_INTERVAL;
}
/**
* Get the LLDP timeout value in seconds
*
* @return LLDP timeout value in seconds
*/
public int getLldpTimeout() {
return LINK_TIMEOUT;
}
@Override
public Map<NodePortTuple, Set<Link>> getPortLinks() {
return portLinks;
}
@Override
public Set<NodePortTuple> getSuppressLLDPsInfo() {
return suppressLinkDiscovery;
}
/**
* Add a switch port to the suppressed LLDP list. Remove any known links on
* the switch port.
*/
@Override
public void AddToSuppressLLDPs(long sw, short port) {
NodePortTuple npt = new NodePortTuple(sw, port);
this.suppressLinkDiscovery.add(npt);
deleteLinksOnPort(npt, "LLDP suppressed.");
}
/**
* Remove a switch port from the suppressed LLDP list. Discover links on
* that switchport.
*/
@Override
public void RemoveFromSuppressLLDPs(long sw, short port) {
NodePortTuple npt = new NodePortTuple(sw, port);
this.suppressLinkDiscovery.remove(npt);
discover(npt);
}
public boolean isShuttingDown() {
return shuttingDown;
}
@Override
public boolean isTunnelPort(long sw, short port) {
return false;
}
@Override
public ILinkDiscovery.LinkType getLinkType(Link lt, LinkInfo info) {
if (info.getUnicastValidTime() != null) {
return ILinkDiscovery.LinkType.DIRECT_LINK;
} else if (info.getMulticastValidTime() != null) {
return ILinkDiscovery.LinkType.MULTIHOP_LINK;
}
return ILinkDiscovery.LinkType.INVALID_LINK;
}
@Override
public Set<Short> getQuarantinedPorts(long sw) {
Set<Short> qPorts = new HashSet<Short>();
Iterator<NodePortTuple> iter = quarantineQueue.iterator();
while (iter.hasNext()) {
NodePortTuple npt = iter.next();
if (npt.getNodeId() == sw) {
qPorts.add(npt.getPortId());
}
}
return qPorts;
}
@Override
public Map<Long, Set<Link>> getSwitchLinks() {
return this.switchLinks;
}
@Override
public void addMACToIgnoreList(long mac, int ignoreBits) {
MACRange range = new MACRange();
range.baseMAC = mac;
range.ignoreBits = ignoreBits;
ignoreMACSet.add(range);
}
@Override
public boolean isAutoPortFastFeature() {
return autoPortFastFeature;
}
@Override
public void setAutoPortFastFeature(boolean autoPortFastFeature) {
this.autoPortFastFeature = autoPortFastFeature;
}
@Override
public void addListener(ILinkDiscoveryListener listener) {
linkDiscoveryAware.add(listener);
}
@Override
public Map<Link, LinkInfo> getLinks() {
lock.readLock().lock();
Map<Link, LinkInfo> result;
try {
result = new HashMap<Link, LinkInfo>(links);
} finally {
lock.readLock().unlock();
}
return result;
}
@Override
public LinkInfo getLinkInfo(Link link) {
lock.readLock().lock();
LinkInfo linkInfo = links.get(link);
LinkInfo retLinkInfo = null;
if (linkInfo != null) {
retLinkInfo = new LinkInfo(linkInfo);
}
lock.readLock().unlock();
return retLinkInfo;
}
@Override
public String getName() {
return MODULE_NAME;
}
//*********************
// OFMessage Listener
//*********************
@Override
public Command receive(IOFSwitch sw, OFMessage msg,
FloodlightContext cntx) {
switch (msg.getType()) {
case PACKET_IN:
ctrIncoming.updateCounterNoFlush();
return this.handlePacketIn(sw.getId(), (OFPacketIn) msg,
cntx);
default:
break;
}
return Command.CONTINUE;
}
@Override
public boolean isCallbackOrderingPrereq(OFType type, String name) {
return false;
}
@Override
public boolean isCallbackOrderingPostreq(OFType type, String name) {
return false;
}
//***********************************
// Internal Methods - Packet-in Processing Related
//***********************************
protected Command handlePacketIn(long sw, OFPacketIn pi,
FloodlightContext cntx) {
Ethernet eth = IFloodlightProviderService.bcStore.get(cntx,
IFloodlightProviderService.CONTEXT_PI_PAYLOAD);
if (eth.getPayload() instanceof BSN) {
BSN bsn = (BSN) eth.getPayload();
if (bsn == null) return Command.STOP;
if (bsn.getPayload() == null) return Command.STOP;
// It could be a packet other than BSN LLDP, therefore
// continue with the regular processing.
if (bsn.getPayload() instanceof LLDP == false)
return Command.CONTINUE;
return handleLldp((LLDP) bsn.getPayload(), sw, pi.getInPort(), false, cntx);
} else if (eth.getPayload() instanceof LLDP) {
return handleLldp((LLDP) eth.getPayload(), sw, pi.getInPort(), true, cntx);
} else if (eth.getEtherType() < 1500) {
long destMac = eth.getDestinationMAC().toLong();
if ((destMac & LINK_LOCAL_MASK) == LINK_LOCAL_VALUE) {
ctrLinkLocalDrops.updateCounterNoFlush();
if (log.isTraceEnabled()) {
log.trace("Ignoring packet addressed to 802.1D/Q "
+ "reserved address.");
}
return Command.STOP;
}
}
if (ignorePacketInFromSource(eth.getSourceMAC().toLong())) {
ctrIgnoreSrcMacDrops.updateCounterNoFlush();
return Command.STOP;
}
// If packet-in is from a quarantine port, stop processing.
NodePortTuple npt = new NodePortTuple(sw, pi.getInPort());
if (quarantineQueue.contains(npt)) {
ctrQuarantineDrops.updateCounterNoFlush();
return Command.STOP;
}
return Command.CONTINUE;
}
private boolean ignorePacketInFromSource(long srcMAC) {
Iterator<MACRange> it = ignoreMACSet.iterator();
while (it.hasNext()) {
MACRange range = it.next();
long mask = ~0;
if (range.ignoreBits >= 0 && range.ignoreBits <= 48) {
mask = mask << range.ignoreBits;
if ((range.baseMAC & mask) == (srcMAC & mask)) {
return true;
}
}
}
return false;
}
private Command handleLldp(LLDP lldp, long sw, short inPort,
boolean isStandard, FloodlightContext cntx) {
// If LLDP is suppressed on this port, ignore received packet as well
IOFSwitch iofSwitch = floodlightProvider.getSwitch(sw);
if (!isIncomingDiscoveryAllowed(sw, inPort, isStandard))
return Command.STOP;
// If this is a malformed LLDP exit
if (lldp.getPortId() == null || lldp.getPortId().getLength() != 3) {
return Command.STOP;
}
long myId = ByteBuffer.wrap(controllerTLV.getValue()).getLong();
long otherId = 0;
boolean myLLDP = false;
Boolean isReverse = null;
ByteBuffer portBB = ByteBuffer.wrap(lldp.getPortId().getValue());
portBB.position(1);
Short remotePort = portBB.getShort();
IOFSwitch remoteSwitch = null;
// Verify this LLDP packet matches what we're looking for
for (LLDPTLV lldptlv : lldp.getOptionalTLVList()) {
if (lldptlv.getType() == 127 && lldptlv.getLength() == 12
&& lldptlv.getValue()[0] == 0x0
&& lldptlv.getValue()[1] == 0x26
&& lldptlv.getValue()[2] == (byte) 0xe1
&& lldptlv.getValue()[3] == 0x0) {
ByteBuffer dpidBB = ByteBuffer.wrap(lldptlv.getValue());
remoteSwitch = floodlightProvider.getSwitch(dpidBB.getLong(4));
} else if (lldptlv.getType() == 12 && lldptlv.getLength() == 8) {
otherId = ByteBuffer.wrap(lldptlv.getValue()).getLong();
if (myId == otherId) myLLDP = true;
} else if (lldptlv.getType() == TLV_DIRECTION_TYPE
&& lldptlv.getLength() == TLV_DIRECTION_LENGTH) {
if (lldptlv.getValue()[0] == TLV_DIRECTION_VALUE_FORWARD[0])
isReverse = false;
else if (lldptlv.getValue()[0] == TLV_DIRECTION_VALUE_REVERSE[0])
isReverse = true;
}
}
if (myLLDP == false) {
// This is not the LLDP sent by this controller.
// If the LLDP message has multicast bit set, then we need to
// broadcast the packet as a regular packet (after checking IDs)
if (isStandard) {
if (log.isTraceEnabled()) {
log.trace("Got a standard LLDP=[{}] that was not sent by" +
" this controller. Not fowarding it.", lldp.toString());
}
return Command.STOP;
} else if (myId < otherId) {
if (log.isTraceEnabled()) {
log.trace("Getting BDDP packets from a different controller"
+ "and letting it go through normal processing chain.");
}
return Command.CONTINUE;
}
return Command.STOP;
}
if (remoteSwitch == null) {
// Ignore LLDPs not generated by Floodlight, or from a switch that
// has recently
// disconnected, or from a switch connected to another Floodlight
// instance
if (log.isTraceEnabled()) {
log.trace("Received LLDP from remote switch not connected to the controller");
}
return Command.STOP;
}
if (!remoteSwitch.portEnabled(remotePort)) {
if (log.isTraceEnabled()) {
log.trace("Ignoring link with disabled source port: switch {} port {} {}",
new Object[] { remoteSwitch.getStringId(),
remotePort,
remoteSwitch.getPort(remotePort)});
}
return Command.STOP;
}
if (suppressLinkDiscovery.contains(new NodePortTuple(
remoteSwitch.getId(),
remotePort))) {
if (log.isTraceEnabled()) {
log.trace("Ignoring link with suppressed src port: switch {} port {} {}",
new Object[] { remoteSwitch.getStringId(),
remotePort,
remoteSwitch.getPort(remotePort)});
}
return Command.STOP;
}
if (!iofSwitch.portEnabled(inPort)) {
if (log.isTraceEnabled()) {
log.trace("Ignoring link with disabled dest port: switch {} port {} {}",
new Object[] { HexString.toHexString(sw),
inPort,
iofSwitch.getPort(inPort)});
}
return Command.STOP;
}
// Store the time of update to this link, and push it out to
// routingEngine
Link lt = new Link(remoteSwitch.getId(), remotePort,
iofSwitch.getId(), inPort);
if (!isLinkAllowed(lt.getSrc(), lt.getSrcPort(),
lt.getDst(), lt.getDstPort()))
return Command.STOP;
// Continue only if link is allowed.
Long lastLldpTime = null;
Long lastBddpTime = null;
Long firstSeenTime = System.currentTimeMillis();
if (isStandard)
lastLldpTime = System.currentTimeMillis();
else
lastBddpTime = System.currentTimeMillis();
LinkInfo newLinkInfo = new LinkInfo(firstSeenTime, lastLldpTime,
lastBddpTime);
addOrUpdateLink(lt, newLinkInfo);
// Check if reverse link exists.
// If it doesn't exist and if the forward link was seen
// first seen within a small interval, send probe on the
// reverse link.
newLinkInfo = links.get(lt);
if (newLinkInfo != null && isStandard && isReverse == false) {
Link reverseLink = new Link(lt.getDst(), lt.getDstPort(),
lt.getSrc(), lt.getSrcPort());
LinkInfo reverseInfo = links.get(reverseLink);
if (reverseInfo == null) {
// the reverse link does not exist.
if (newLinkInfo.getFirstSeenTime() > System.currentTimeMillis()
- LINK_TIMEOUT) {
this.sendDiscoveryMessage(lt.getDst(), lt.getDstPort(),
isStandard, true);
}
}
}
// If the received packet is a BDDP packet, then create a reverse BDDP
// link as well.
if (!isStandard) {
Link reverseLink = new Link(lt.getDst(), lt.getDstPort(),
lt.getSrc(), lt.getSrcPort());
// srcPortState and dstPort state are reversed.
LinkInfo reverseInfo = new LinkInfo(firstSeenTime, lastLldpTime,
lastBddpTime);
addOrUpdateLink(reverseLink, reverseInfo);
}
// Remove the node ports from the quarantine and maintenance queues.
NodePortTuple nptSrc = new NodePortTuple(lt.getSrc(),
lt.getSrcPort());
NodePortTuple nptDst = new NodePortTuple(lt.getDst(),
lt.getDstPort());
removeFromQuarantineQueue(nptSrc);
removeFromMaintenanceQueue(nptSrc);
removeFromQuarantineQueue(nptDst);
removeFromMaintenanceQueue(nptDst);
// Consume this message
ctrLldpEol.updateCounterNoFlush();
return Command.STOP;
}
//***********************************
// Internal Methods - Port Status/ New Port Processing Related
//***********************************
/**
* Process a new port. If link discovery is disabled on the port, then do
* nothing. If autoportfast feature is enabled and the port is a fast port,
* then do nothing. Otherwise, send LLDP message. Add the port to
* quarantine.
*
* @param sw
* @param p
*/
private void processNewPort(long sw, short p) {
if (isLinkDiscoverySuppressed(sw, p)) {
// Do nothing as link discovery is suppressed.
return;
}
IOFSwitch iofSwitch = floodlightProvider.getSwitch(sw);
if (iofSwitch == null) return;
if (autoPortFastFeature && iofSwitch.isFastPort(p)) {
// Do nothing as the port is a fast port.
return;
}
NodePortTuple npt = new NodePortTuple(sw, p);
discover(sw, p);
// if it is not a fast port, add it to quarantine.
if (!iofSwitch.isFastPort(p)) {
addToQuarantineQueue(npt);
} else {
// Add to maintenance queue to ensure that BDDP packets
// are sent out.
addToMaintenanceQueue(npt);
}
}
//***********************************
// Internal Methods - Discovery Related
//***********************************
@LogMessageDoc(level = "ERROR",
message = "Error in link discovery updates loop",
explanation = "An unknown error occured while dispatching "
+ "link update notifications",
recommendation = LogMessageDoc.GENERIC_ACTION)
private void doUpdatesThread() throws InterruptedException {
do {
LDUpdate update = updates.take();
List<LDUpdate> updateList = new ArrayList<LDUpdate>();
updateList.add(update);
// Add all the pending updates to the list.
while (updates.peek() != null) {
updateList.add(updates.remove());
}
if (linkDiscoveryAware != null) {
if (log.isTraceEnabled()) {
log.trace("Dispatching link discovery update {} {} {} {} {} for {}",
new Object[] {
update.getOperation(),
HexString.toHexString(update.getSrc()),
update.getSrcPort(),
HexString.toHexString(update.getDst()),
update.getDstPort(),
linkDiscoveryAware });
}
try {
for (ILinkDiscoveryListener lda : linkDiscoveryAware) { // order
// maintained
lda.linkDiscoveryUpdate(updateList);
}
} catch (Exception e) {
log.error("Error in link discovery updates loop", e);
}
}
} while (updates.peek() != null);
}
protected boolean isLinkDiscoverySuppressed(long sw, short portNumber) {
return this.suppressLinkDiscovery.contains(new NodePortTuple(sw,
portNumber));
}
protected void discoverLinks() {
// timeout known links.
timeoutLinks();
// increment LLDP clock
lldpClock = (lldpClock + 1) % LLDP_TO_ALL_INTERVAL;
if (lldpClock == 0) {
if (log.isTraceEnabled())
log.trace("Sending LLDP out on all ports.");
discoverOnAllPorts();
}
}
/**
* Quarantine Ports.
*/
protected class QuarantineWorker implements Runnable {
@Override
public void run() {
try {
processBDDPLists();
} catch (Exception e) {
log.error("Error in quarantine worker thread", e);
} finally {
bddpTask.reschedule(BDDP_TASK_INTERVAL,
TimeUnit.MILLISECONDS);
}
}
}
/**
* Add a switch port to the quarantine queue. Schedule the quarantine task
* if the quarantine queue was empty before adding this switch port.
*
* @param npt
*/
protected void addToQuarantineQueue(NodePortTuple npt) {
if (quarantineQueue.contains(npt) == false)
quarantineQueue.add(npt);
}
/**
* Remove a switch port from the quarantine queue.
*/
protected void removeFromQuarantineQueue(NodePortTuple npt) {
// Remove all occurrences of the node port tuple from the list.
while (quarantineQueue.remove(npt))
;
}
/**
* Add a switch port to maintenance queue.
*
* @param npt
*/
protected void addToMaintenanceQueue(NodePortTuple npt) {
// TODO We are not checking if the switch port tuple is already
// in the maintenance list or not. This will be an issue for
// really large number of switch ports in the network.
if (maintenanceQueue.contains(npt) == false)
maintenanceQueue.add(npt);
}
/**
* Remove a switch port from maintenance queue.
*
* @param npt
*/
protected void removeFromMaintenanceQueue(NodePortTuple npt) {
// Remove all occurrences of the node port tuple from the queue.
while (maintenanceQueue.remove(npt))
;
}
/**
* This method processes the quarantine list in bursts. The task is at most
* once per BDDP_TASK_INTERVAL. One each call, BDDP_TASK_SIZE number of
* switch ports are processed. Once the BDDP packets are sent out through
* the switch ports, the ports are removed from the quarantine list.
*/
protected void processBDDPLists() {
int count = 0;
Set<NodePortTuple> nptList = new HashSet<NodePortTuple>();
while (count < BDDP_TASK_SIZE && quarantineQueue.peek() != null) {
NodePortTuple npt;
npt = quarantineQueue.remove();
sendDiscoveryMessage(npt.getNodeId(), npt.getPortId(), false,
false);
nptList.add(npt);
count++;
}
count = 0;
while (count < BDDP_TASK_SIZE && maintenanceQueue.peek() != null) {
NodePortTuple npt;
npt = maintenanceQueue.remove();
sendDiscoveryMessage(npt.getNodeId(), npt.getPortId(), false,
false);
count++;
}
for (NodePortTuple npt : nptList) {
generateSwitchPortStatusUpdate(npt.getNodeId(), npt.getPortId());
}
}
private void generateSwitchPortStatusUpdate(long sw, short port) {
UpdateOperation operation;
IOFSwitch iofSwitch = floodlightProvider.getSwitch(sw);
if (iofSwitch == null) return;
OFPhysicalPort ofp = iofSwitch.getPort(port).toOFPhysicalPort();
if (ofp == null) return;
int srcPortState = ofp.getState();
boolean portUp = ((srcPortState & OFPortState.OFPPS_STP_MASK.getValue())
!= OFPortState.OFPPS_STP_BLOCK.getValue());
if (portUp)
operation = UpdateOperation.PORT_UP;
else
operation = UpdateOperation.PORT_DOWN;
updates.add(new LDUpdate(sw, port, operation));
}
protected void discover(NodePortTuple npt) {
discover(npt.getNodeId(), npt.getPortId());
}
protected void discover(long sw, short port) {
sendDiscoveryMessage(sw, port, true, false);
}
/**
* Check if incoming discovery messages are enabled or not.
* @param sw
* @param port
* @param isStandard
* @return
*/
protected boolean isIncomingDiscoveryAllowed(long sw, short port,
boolean isStandard) {
if (isLinkDiscoverySuppressed(sw, port)) {
/* Do not process LLDPs from this port as suppressLLDP is set */
return false;
}
IOFSwitch iofSwitch = floodlightProvider.getSwitch(sw);
if (iofSwitch == null) {
return false;
}
if (port == OFPort.OFPP_LOCAL.getValue()) return false;
ImmutablePort ofpPort = iofSwitch.getPort(port);
if (ofpPort == null) {
if (log.isTraceEnabled()) {
log.trace("Null physical port. sw={}, port={}",
HexString.toHexString(sw), port);
}
return false;
}
return true;
}
/**
* Check if outgoing discovery messages are enabled or not.
* @param sw
* @param port
* @param isStandard
* @param isReverse
* @return
*/
protected boolean isOutgoingDiscoveryAllowed(long sw, short port,
boolean isStandard,
boolean isReverse) {
if (isLinkDiscoverySuppressed(sw, port)) {
/* Dont send LLDPs out of this port as suppressLLDP is set */
return false;
}
IOFSwitch iofSwitch = floodlightProvider.getSwitch(sw);
if (iofSwitch == null) {
return false;
}
if (port == OFPort.OFPP_LOCAL.getValue()) return false;
ImmutablePort ofpPort = iofSwitch.getPort(port);
if (ofpPort == null) {
if (log.isTraceEnabled()) {
log.trace("Null physical port. sw={}, port={}",
HexString.toHexString(sw), port);
}
return false;
}
// For fast ports, do not send forward LLDPs or BDDPs.
if (!isReverse && autoPortFastFeature && iofSwitch.isFastPort(port))
return false;
return true;
}
/**
* Get the actions for packet-out corresponding to a specific port.
* This is a placeholder for adding actions if any port-specific
* actions are desired. The default action is simply to output to
* the given port.
* @param port
* @return
*/
protected List<OFAction> getDiscoveryActions (IOFSwitch sw, OFPhysicalPort port){
// set actions
List<OFAction> actions = new ArrayList<OFAction>();
actions.add(new OFActionOutput(port.getPortNumber(), (short) 0));
return actions;
}
/**
* Send link discovery message out of a given switch port. The discovery
* message may be a standard LLDP or a modified LLDP, where the dst mac
* address is set to :ff. TODO: The modified LLDP will updated in the future
* and may use a different eth-type.
*
* @param sw
* @param port
* @param isStandard
* indicates standard or modified LLDP
* @param isReverse
* indicates whether the LLDP was sent as a response
*/
@LogMessageDoc(level = "ERROR",
message = "Failure sending LLDP out port {port} on switch {switch}",
explanation = "An I/O error occured while sending LLDP message "
+ "to the switch.",
recommendation = LogMessageDoc.CHECK_SWITCH)
protected void sendDiscoveryMessage(long sw, short port,
boolean isStandard, boolean isReverse) {
// Takes care of all checks including null pointer checks.
if (!isOutgoingDiscoveryAllowed(sw, port, isStandard, isReverse))
return;
IOFSwitch iofSwitch = floodlightProvider.getSwitch(sw);
OFPhysicalPort ofpPort = iofSwitch.getPort(port).toOFPhysicalPort();
if (log.isTraceEnabled()) {
log.trace("Sending LLDP packet out of swich: {}, port: {}",
HexString.toHexString(sw), port);
}
OFPacketOut po = generateLLDPMessage(sw, port, isStandard, isReverse);
// Add actions
List<OFAction> actions = getDiscoveryActions(iofSwitch, ofpPort);
po.setActions(actions);
short actionLength = 0;
Iterator <OFAction> actionIter = actions.iterator();
while (actionIter.hasNext()) {
actionLength += actionIter.next().getLength();
}
po.setActionsLength(actionLength);
// po already has the minimum length + data length set
// simply add the actions length to this.
po.setLengthU(po.getLengthU() + po.getActionsLength());
// send
try {
iofSwitch.write(po, null);
iofSwitch.flush();
} catch (IOException e) {
log.error("Failure sending LLDP out port {} on switch {}",
new Object[] { port, iofSwitch.getStringId() }, e);
}
}
/**
* Send LLDPs to all switch-ports
*/
protected void discoverOnAllPorts() {
if (log.isTraceEnabled()) {
log.trace("Sending LLDP packets out of all the enabled ports");
}
// Send standard LLDPs
for (long sw : floodlightProvider.getAllSwitchDpids()) {
IOFSwitch iofSwitch = floodlightProvider.getSwitch(sw);
if (iofSwitch == null) continue;
if (iofSwitch.getEnabledPorts() != null) {
for (ImmutablePort ofp : iofSwitch.getEnabledPorts()) {
if (isLinkDiscoverySuppressed(sw, ofp.getPortNumber()))
continue;
if (autoPortFastFeature
&& iofSwitch.isFastPort(ofp.getPortNumber()))
continue;
// sends forward LLDP only non-fastports.
sendDiscoveryMessage(sw, ofp.getPortNumber(), true,
false);
// If the switch port is not already in the maintenance
// queue, add it.
NodePortTuple npt = new NodePortTuple(
sw,
ofp.getPortNumber());
addToMaintenanceQueue(npt);
}
}
}
}
protected UpdateOperation getUpdateOperation(int srcPortState,
int dstPortState) {
boolean added = (((srcPortState & OFPortState.OFPPS_STP_MASK.getValue())
!= OFPortState.OFPPS_STP_BLOCK.getValue()) &&
((dstPortState & OFPortState.OFPPS_STP_MASK.getValue())
!= OFPortState.OFPPS_STP_BLOCK.getValue()));
if (added) return UpdateOperation.LINK_UPDATED;
return UpdateOperation.LINK_REMOVED;
}
protected UpdateOperation getUpdateOperation(int srcPortState) {
boolean portUp = ((srcPortState & OFPortState.OFPPS_STP_MASK.getValue()) != OFPortState.OFPPS_STP_BLOCK.getValue());
if (portUp)
return UpdateOperation.PORT_UP;
else
return UpdateOperation.PORT_DOWN;
}
//************************************
// Internal Methods - Link Operations Related
//************************************
/**
* This method is used to specifically ignore/consider specific links.
*/
protected boolean isLinkAllowed(long src, short srcPort,
long dst, short dstPort) {
return true;
}
private boolean addLink(Link lt, LinkInfo newInfo) {
NodePortTuple srcNpt, dstNpt;
srcNpt = new NodePortTuple(lt.getSrc(), lt.getSrcPort());
dstNpt = new NodePortTuple(lt.getDst(), lt.getDstPort());
// index it by switch source
if (!switchLinks.containsKey(lt.getSrc()))
switchLinks.put(lt.getSrc(),
new HashSet<Link>());
switchLinks.get(lt.getSrc()).add(lt);
// index it by switch dest
if (!switchLinks.containsKey(lt.getDst()))
switchLinks.put(lt.getDst(),
new HashSet<Link>());
switchLinks.get(lt.getDst()).add(lt);
// index both ends by switch:port
if (!portLinks.containsKey(srcNpt))
portLinks.put(srcNpt,
new HashSet<Link>());
portLinks.get(srcNpt).add(lt);
if (!portLinks.containsKey(dstNpt))
portLinks.put(dstNpt,
new HashSet<Link>());
portLinks.get(dstNpt).add(lt);
return true;
}
protected boolean updateLink(Link lt, LinkInfo oldInfo, LinkInfo newInfo) {
boolean linkChanged = false;
// Since the link info is already there, we need to
// update the right fields.
if (newInfo.getUnicastValidTime() == null) {
// This is due to a multicast LLDP, so copy the old unicast
// value.
if (oldInfo.getUnicastValidTime() != null) {
newInfo.setUnicastValidTime(oldInfo.getUnicastValidTime());
}
} else if (newInfo.getMulticastValidTime() == null) {
// This is due to a unicast LLDP, so copy the old multicast
// value.
if (oldInfo.getMulticastValidTime() != null) {
newInfo.setMulticastValidTime(oldInfo.getMulticastValidTime());
}
}
Long oldTime = oldInfo.getUnicastValidTime();
Long newTime = newInfo.getUnicastValidTime();
// the link has changed its state between openflow and
// non-openflow
// if the unicastValidTimes are null or not null
if (oldTime != null & newTime == null) {
linkChanged = true;
} else if (oldTime == null & newTime != null) {
linkChanged = true;
}
return linkChanged;
}
@LogMessageDocs({
@LogMessageDoc(message="Inter-switch link detected:",
explanation="Detected a new link between two openflow switches," +
"use show link to find current status"),
@LogMessageDoc(message="Inter-switch link updated:",
explanation="Detected a link change between two openflow switches, " +
"use show link to find current status")
})
protected boolean addOrUpdateLink(Link lt, LinkInfo newInfo) {
boolean linkChanged = false;
lock.writeLock().lock();
try {
// put the new info. if an old info exists, it will be returned.
LinkInfo oldInfo = links.put(lt, newInfo);
if (oldInfo != null
&& oldInfo.getFirstSeenTime() < newInfo.getFirstSeenTime())
newInfo.setFirstSeenTime(oldInfo.getFirstSeenTime());
if (log.isTraceEnabled()) {
log.trace("addOrUpdateLink: {} {}",
lt,
(newInfo.getMulticastValidTime() != null) ? "multicast"
: "unicast");
}
UpdateOperation updateOperation = null;
linkChanged = false;
if (oldInfo == null) {
addLink(lt, newInfo);
updateOperation = UpdateOperation.LINK_UPDATED;
linkChanged = true;
// Log direct links only. Multi-hop links may be numerous
// Add all to event history
LinkType linkType = getLinkType(lt, newInfo);
if (linkType == ILinkDiscovery.LinkType.DIRECT_LINK) {
log.info("Inter-switch link detected: {}", lt);
evDirectLink.updateEventNoFlush(new DirectLinkEvent(lt.getSrc(),
lt.getSrcPort(), lt.getDst(), lt.getDstPort(), "direct-link-added::rcvd LLDP"));
}
notifier.postNotification("Link added: " + lt.toString());
} else {
linkChanged = updateLink(lt, oldInfo, newInfo);
if (linkChanged) {
updateOperation = UpdateOperation.LINK_UPDATED;
LinkType linkType = getLinkType(lt, newInfo);
if (linkType == ILinkDiscovery.LinkType.DIRECT_LINK) {
log.info("Inter-switch link updated: {}", lt);
evDirectLink.updateEventNoFlush(new DirectLinkEvent(lt.getSrc(),
lt.getSrcPort(), lt.getDst(), lt.getDstPort(),
"link-port-state-updated::rcvd LLDP"));
}
notifier.postNotification("Link updated: " + lt.toString());
}
}
// Write changes to storage. This will always write the updated
// valid time, plus the port states if they've changed (i.e. if
// they weren't set to null in the previous block of code.
writeLinkToStorage(lt, newInfo);
if (linkChanged) {
// find out if the link was added or removed here.
updates.add(new LDUpdate(lt.getSrc(), lt.getSrcPort(),
lt.getDst(), lt.getDstPort(),
getLinkType(lt, newInfo),
updateOperation));
}
} finally {
lock.writeLock().unlock();
}
return linkChanged;
}
/**
* Delete a link
*
* @param link
* - link to be deleted.
* @param reason
* - reason why the link is deleted.
*/
protected void deleteLink(Link link, String reason) {
if (link == null)
return;
List<Link> linkList = new ArrayList<Link>();
linkList.add(link);
deleteLinks(linkList, reason);
}
/**
* Removes links from memory and storage.
*
* @param links
* The List of @LinkTuple to delete.
*/
protected void deleteLinks(List<Link> links, String reason) {
deleteLinks(links, reason, null);
}
/**
* Removes links from memory and storage.
*
* @param links
* The List of @LinkTuple to delete.
*/
@LogMessageDoc(message="Inter-switch link removed:",
explanation="A previously detected link between two openflow switches no longer exists, " +
"use show link to find current status")
protected void deleteLinks(List<Link> links, String reason,
List<LDUpdate> updateList) {
NodePortTuple srcNpt, dstNpt;
List<LDUpdate> linkUpdateList = new ArrayList<LDUpdate>();
lock.writeLock().lock();
try {
for (Link lt : links) {
srcNpt = new NodePortTuple(lt.getSrc(), lt.getSrcPort());
dstNpt = new NodePortTuple(lt.getDst(), lt.getDstPort());
if (switchLinks.containsKey(lt.getSrc())) {
switchLinks.get(lt.getSrc()).remove(lt);
if (switchLinks.get(lt.getSrc()).isEmpty())
this.switchLinks.remove(lt.getSrc());
}
if (this.switchLinks.containsKey(lt.getDst())) {
switchLinks.get(lt.getDst()).remove(lt);
if (this.switchLinks.get(lt.getDst()).isEmpty())
this.switchLinks.remove(lt.getDst());
}
if (this.portLinks.get(srcNpt) != null) {
this.portLinks.get(srcNpt).remove(lt);
if (this.portLinks.get(srcNpt).isEmpty())
this.portLinks.remove(srcNpt);
}
if (this.portLinks.get(dstNpt) != null) {
this.portLinks.get(dstNpt).remove(lt);
if (this.portLinks.get(dstNpt).isEmpty())
this.portLinks.remove(dstNpt);
}
LinkInfo info = this.links.remove(lt);
LinkType linkType = getLinkType(lt, info);
linkUpdateList.add(new LDUpdate(lt.getSrc(),
lt.getSrcPort(),
lt.getDst(),
lt.getDstPort(),
linkType,
UpdateOperation.LINK_REMOVED));
// FIXME: link type shows up as invalid now -- thus not checking if
// link type is a direct link
evDirectLink.updateEventWithFlush(new DirectLinkEvent(lt.getSrc(),
lt.getSrcPort(), lt.getDst(), lt.getDstPort(),
"link-deleted::" + reason));
// remove link from storage.
removeLinkFromStorage(lt);
// TODO Whenever link is removed, it has to checked if
// the switchports must be added to quarantine.
if (linkType == ILinkDiscovery.LinkType.DIRECT_LINK) {
log.info("Inter-switch link removed: {}", lt);
notifier.postNotification("Inter-switch link removed: " +
lt.toString());
} else if (log.isTraceEnabled()) {
log.trace("Deleted link {}", lt);
}
}
} finally {
if (updateList != null) linkUpdateList.addAll(updateList);
updates.addAll(linkUpdateList);
lock.writeLock().unlock();
}
}
/**
* Delete links incident on a given switch port.
*
* @param npt
* @param reason
*/
protected void deleteLinksOnPort(NodePortTuple npt, String reason) {
List<Link> eraseList = new ArrayList<Link>();
if (this.portLinks.containsKey(npt)) {
if (log.isTraceEnabled()) {
log.trace("handlePortStatus: Switch {} port #{} "
+ "removing links {}",
new Object[] {
HexString.toHexString(npt.getNodeId()),
npt.getPortId(),
this.portLinks.get(npt) });
}
eraseList.addAll(this.portLinks.get(npt));
deleteLinks(eraseList, reason);
}
}
/**
* Iterates through the list of links and deletes if the last discovery
* message reception time exceeds timeout values.
*/
protected void timeoutLinks() {
List<Link> eraseList = new ArrayList<Link>();
Long curTime = System.currentTimeMillis();
boolean linkChanged = false;
// reentrant required here because deleteLink also write locks
lock.writeLock().lock();
try {
Iterator<Entry<Link, LinkInfo>> it = this.links.entrySet()
.iterator();
while (it.hasNext()) {
Entry<Link, LinkInfo> entry = it.next();
Link lt = entry.getKey();
LinkInfo info = entry.getValue();
// Timeout the unicast and multicast LLDP valid times
// independently.
if ((info.getUnicastValidTime() != null)
&& (info.getUnicastValidTime()
+ (this.LINK_TIMEOUT * 1000) < curTime)) {
info.setUnicastValidTime(null);
linkChanged = true;
}
if ((info.getMulticastValidTime() != null)
&& (info.getMulticastValidTime()
+ (this.LINK_TIMEOUT * 1000) < curTime)) {
info.setMulticastValidTime(null);
linkChanged = true;
}
// Add to the erase list only if the unicast
// time is null.
if (info.getUnicastValidTime() == null
&& info.getMulticastValidTime() == null) {
eraseList.add(entry.getKey());
} else if (linkChanged) {
updates.add(new LDUpdate(lt.getSrc(), lt.getSrcPort(),
lt.getDst(), lt.getDstPort(),
getLinkType(lt, info),
UpdateOperation.LINK_UPDATED));
}
}
// if any link was deleted or any link was changed.
if ((eraseList.size() > 0) || linkChanged) {
deleteLinks(eraseList, "LLDP timeout");
}
} finally {
lock.writeLock().unlock();
}
}
//******************
// Internal Helper Methods
//******************
@LogMessageDoc(level="WARN",
message="Could not get list of interfaces of local machine to " +
"encode in TLV: {detail-msg}",
explanation="Outgoing LLDP packets encode a unique hash to " +
"identify the local machine. The list of network " +
"interfaces is used as input and the controller failed " +
"to query this list",
recommendation=LogMessageDoc.REPORT_CONTROLLER_BUG)
protected void setControllerTLV() {
// Setting the controllerTLVValue based on current nano time,
// controller's IP address, and the network interface object hash
// the corresponding IP address.
final int prime = 7867;
byte[] controllerTLVValue = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 }; // 8
// byte
// value.
ByteBuffer bb = ByteBuffer.allocate(10);
long result = System.nanoTime();
try{
// Use some data specific to the machine this controller is
// running on. In this case: the list of network interfaces
Enumeration<NetworkInterface> ifaces =
NetworkInterface.getNetworkInterfaces();
if (ifaces != null) {
result = result * prime + ifaces.hashCode();
}
} catch (SocketException e) {
log.warn("Could not get list of interfaces of local machine to " +
"encode in TLV: {}", e.toString());
}
// set the first 4 bits to 0.
result = result & (0x0fffffffffffffffL);
bb.putLong(result);
bb.rewind();
bb.get(controllerTLVValue, 0, 8);
this.controllerTLV = new LLDPTLV().setType((byte) 0x0c)
.setLength((short) controllerTLVValue.length)
.setValue(controllerTLVValue);
}
//******************
// IOFSwitchListener
//******************
private void handlePortDown(long switchId, short portNumber) {
NodePortTuple npt = new NodePortTuple(switchId, portNumber);
deleteLinksOnPort(npt, "Port Status Changed");
LDUpdate update = new LDUpdate(switchId, portNumber,
UpdateOperation.PORT_DOWN);
updates.add(update);
}
/**
* We don't react the port changed notifications here. we listen for
* OFPortStatus messages directly. Might consider using this notifier
* instead
*/
@Override
public void switchPortChanged(long switchId,
ImmutablePort port,
IOFSwitch.PortChangeType type) {
switch (type) {
case UP:
processNewPort(switchId, port.getPortNumber());
break;
case DELETE: case DOWN:
handlePortDown(switchId, port.getPortNumber());
break;
case OTHER_UPDATE: case ADD:
// This is something other than port add or delete.
// Topology does not worry about this.
// If for some reason the port features change, which
// we may have to react.
break;
}
}
@Override
public void switchAdded(long switchId) {
// no-op
// We don't do anything at switch added, but we do only when the
// switch is activated.
}
@Override
public void switchRemoved(long sw) {
List<Link> eraseList = new ArrayList<Link>();
lock.writeLock().lock();
try {
if (switchLinks.containsKey(sw)) {
if (log.isTraceEnabled()) {
log.trace("Handle switchRemoved. Switch {}; removing links {}",
HexString.toHexString(sw), switchLinks.get(sw));
}
List<LDUpdate> updateList = new ArrayList<LDUpdate>();
updateList.add(new LDUpdate(sw, null,
UpdateOperation.SWITCH_REMOVED));
// add all tuples with an endpoint on this switch to erase list
eraseList.addAll(switchLinks.get(sw));
// Sending the updateList, will ensure the updates in this
// list will be added at the end of all the link updates.
// Thus, it is not necessary to explicitly add these updates
// to the queue.
deleteLinks(eraseList, "Switch Removed", updateList);
} else {
// Switch does not have any links.
updates.add(new LDUpdate(sw, null,
UpdateOperation.SWITCH_REMOVED));
}
} finally {
lock.writeLock().unlock();
}
}
@Override
public void switchActivated(long switchId) {
IOFSwitch sw = floodlightProvider.getSwitch(switchId);
if (sw.getEnabledPortNumbers() != null) {
for (Short p : sw.getEnabledPortNumbers()) {
processNewPort(sw.getId(), p);
}
}
LDUpdate update = new LDUpdate(sw.getId(), null,
UpdateOperation.SWITCH_UPDATED);
updates.add(update);
}
@Override
public void switchChanged(long switchId) {
// no-op
}
//*********************
// Storage Listener
//*********************
/**
* Sets the IStorageSource to use for Topology
*
* @param storageSource
* the storage source to use
*/
public void setStorageSource(IStorageSourceService storageSource) {
this.storageSource = storageSource;
}
/**
* Gets the storage source for this ITopology
*
* @return The IStorageSource ITopology is writing to
*/
public IStorageSourceService getStorageSource() {
return storageSource;
}
@Override
public void rowsModified(String tableName, Set<Object> rowKeys) {
if (tableName.equals(TOPOLOGY_TABLE_NAME)) {
readTopologyConfigFromStorage();
return;
}
ArrayList<IOFSwitch> updated_switches = new ArrayList<IOFSwitch>();
for (Object key : rowKeys) {
Long swId = new Long(HexString.toLong((String) key));
IOFSwitch sw = floodlightProvider.getSwitch(swId);
if (sw != null) {
boolean curr_status = sw.hasAttribute(IOFSwitch.SWITCH_IS_CORE_SWITCH);
boolean new_status = false;
IResultSet resultSet = null;
try {
resultSet = storageSource.getRow(tableName, key);
for (Iterator<IResultSet> it = resultSet.iterator(); it.hasNext();) {
// In case of multiple rows, use the status in last row?
Map<String, Object> row = it.next().getRow();
if (row.containsKey(SWITCH_CONFIG_CORE_SWITCH)) {
new_status = ((String) row.get(SWITCH_CONFIG_CORE_SWITCH)).equals("true");
}
}
} finally {
if (resultSet != null) resultSet.close();
}
if (curr_status != new_status) {
updated_switches.add(sw);
}
} else {
if (log.isTraceEnabled()) {
log.trace("Update for switch which has no entry in switch "
+ "list (dpid={}), a delete action.",
key);
}
}
}
for (IOFSwitch sw : updated_switches) {
// Set SWITCH_IS_CORE_SWITCH to it's inverse value
if (sw.hasAttribute(IOFSwitch.SWITCH_IS_CORE_SWITCH)) {
sw.removeAttribute(IOFSwitch.SWITCH_IS_CORE_SWITCH);
if (log.isTraceEnabled()) {
log.trace("SWITCH_IS_CORE_SWITCH set to False for {}",
sw);
}
updates.add(new LDUpdate(sw.getId(),
SwitchType.BASIC_SWITCH,
UpdateOperation.SWITCH_UPDATED));
} else {
sw.setAttribute(IOFSwitch.SWITCH_IS_CORE_SWITCH,
new Boolean(true));
if (log.isTraceEnabled()) {
log.trace("SWITCH_IS_CORE_SWITCH set to True for {}", sw);
}
updates.add(new LDUpdate(sw.getId(), SwitchType.CORE_SWITCH,
UpdateOperation.SWITCH_UPDATED));
}
}
}
@Override
public void rowsDeleted(String tableName, Set<Object> rowKeys) {
// Ignore delete events, the switch delete will do the
// right thing on it's own.
readTopologyConfigFromStorage();
}
//******************************
// Internal methods - Config Related
//******************************
protected void readTopologyConfigFromStorage() {
IResultSet topologyResult = storageSource.executeQuery(TOPOLOGY_TABLE_NAME,
null, null,
null);
if (topologyResult.next()) {
boolean apf = topologyResult.getBoolean(TOPOLOGY_AUTOPORTFAST);
autoPortFastFeature = apf;
} else {
this.autoPortFastFeature = AUTOPORTFAST_DEFAULT;
}
if (autoPortFastFeature)
log.info("Setting autoportfast feature to ON");
else
log.info("Setting autoportfast feature to OFF");
}
/**
* Deletes all links from storage
*/
void clearAllLinks() {
storageSource.deleteRowsAsync(LINK_TABLE_NAME, null);
}
/**
* Writes a LinkTuple and corresponding LinkInfo to storage
*
* @param lt
* The LinkTuple to write
* @param linkInfo
* The LinkInfo to write
*/
protected void writeLinkToStorage(Link lt, LinkInfo linkInfo) {
LinkType type = getLinkType(lt, linkInfo);
// Write only direct links. Do not write links to external
// L2 network.
// if (type != LinkType.DIRECT_LINK && type != LinkType.TUNNEL) {
// return;
// }
Map<String, Object> rowValues = new HashMap<String, Object>();
String id = getLinkId(lt);
rowValues.put(LINK_ID, id);
rowValues.put(LINK_VALID_TIME, linkInfo.getUnicastValidTime());
String srcDpid = HexString.toHexString(lt.getSrc());
rowValues.put(LINK_SRC_SWITCH, srcDpid);
rowValues.put(LINK_SRC_PORT, lt.getSrcPort());
if (type == LinkType.DIRECT_LINK)
rowValues.put(LINK_TYPE, "internal");
else if (type == LinkType.MULTIHOP_LINK)
rowValues.put(LINK_TYPE, "external");
else if (type == LinkType.TUNNEL)
rowValues.put(LINK_TYPE, "tunnel");
else
rowValues.put(LINK_TYPE, "invalid");
String dstDpid = HexString.toHexString(lt.getDst());
rowValues.put(LINK_DST_SWITCH, dstDpid);
rowValues.put(LINK_DST_PORT, lt.getDstPort());
storageSource.updateRowAsync(LINK_TABLE_NAME, rowValues);
}
/**
* Removes a link from storage using an asynchronous call.
*
* @param lt
* The LinkTuple to delete.
*/
protected void removeLinkFromStorage(Link lt) {
String id = getLinkId(lt);
storageSource.deleteRowAsync(LINK_TABLE_NAME, id);
}
public Long readLinkValidTime(Link lt) {
// FIXME: We're not currently using this right now, but if we start
// to use this again, we probably shouldn't use it in its current
// form, because it's doing synchronous storage calls. Depending
// on the context this may still be OK, but if it's being called
// on the packet in processing thread it should be reworked to
// use asynchronous storage calls.
Long validTime = null;
IResultSet resultSet = null;
try {
String[] columns = { LINK_VALID_TIME };
String id = getLinkId(lt);
resultSet = storageSource.executeQuery(LINK_TABLE_NAME,
columns,
new OperatorPredicate(
LINK_ID,
OperatorPredicate.Operator.EQ,
id),
null);
if (resultSet.next())
validTime = resultSet.getLong(LINK_VALID_TIME);
} finally {
if (resultSet != null) resultSet.close();
}
return validTime;
}
/**
* Gets the storage key for a LinkTuple
*
* @param lt
* The LinkTuple to get
* @return The storage key as a String
*/
private String getLinkId(Link lt) {
return HexString.toHexString(lt.getSrc()) + "-" + lt.getSrcPort()
+ "-" + HexString.toHexString(lt.getDst()) + "-"
+ lt.getDstPort();
}
//***************
// IFloodlightModule
//***************
@Override
public Collection<Class<? extends IFloodlightService>> getModuleServices() {
Collection<Class<? extends IFloodlightService>> l =
new ArrayList<Class<? extends IFloodlightService>>();
l.add(ILinkDiscoveryService.class);
// l.add(ITopologyService.class);
return l;
}
@Override
public Map<Class<? extends IFloodlightService>, IFloodlightService> getServiceImpls() {
Map<Class<? extends IFloodlightService>, IFloodlightService> m =
new HashMap<Class<? extends IFloodlightService>, IFloodlightService>();
// We are the class that implements the service
m.put(ILinkDiscoveryService.class, this);
return m;
}
@Override
public Collection<Class<? extends IFloodlightService>> getModuleDependencies() {
Collection<Class<? extends IFloodlightService>> l =
new ArrayList<Class<? extends IFloodlightService>>();
l.add(IFloodlightProviderService.class);
l.add(IStorageSourceService.class);
l.add(IThreadPoolService.class);
l.add(IRestApiService.class);
return l;
}
@Override
public void init(FloodlightModuleContext context)
throws FloodlightModuleException {
floodlightProvider = context.getServiceImpl(IFloodlightProviderService.class);
storageSource = context.getServiceImpl(IStorageSourceService.class);
threadPool = context.getServiceImpl(IThreadPoolService.class);
restApi = context.getServiceImpl(IRestApiService.class);
debugCounters = context.getServiceImpl(IDebugCounterService.class);
debugEvents = context.getServiceImpl(IDebugEventService.class);
// read our config options
Map<String, String> configOptions = context.getConfigParams(this);
try {
String histSize = configOptions.get("eventhistorysize");
if (histSize != null) {
EVENT_HISTORY_SIZE = Short.parseShort(histSize);
}
} catch (NumberFormatException e) {
log.warn("Error event history size, using default of {} seconds", EVENT_HISTORY_SIZE);
}
log.debug("Event history size set to {}", EVENT_HISTORY_SIZE);
// Set the autoportfast feature to false.
this.autoPortFastFeature = AUTOPORTFAST_DEFAULT;
// We create this here because there is no ordering guarantee
this.linkDiscoveryAware = new ArrayList<ILinkDiscoveryListener>();
this.lock = new ReentrantReadWriteLock();
this.updates = new LinkedBlockingQueue<LDUpdate>();
this.links = new HashMap<Link, LinkInfo>();
this.portLinks = new HashMap<NodePortTuple, Set<Link>>();
this.suppressLinkDiscovery = Collections.synchronizedSet(new HashSet<NodePortTuple>());
this.switchLinks = new HashMap<Long, Set<Link>>();
this.quarantineQueue = new LinkedBlockingQueue<NodePortTuple>();
this.maintenanceQueue = new LinkedBlockingQueue<NodePortTuple>();
this.ignoreMACSet = Collections.newSetFromMap(
new ConcurrentHashMap<MACRange,Boolean>());
this.haListener = new HAListenerDelegate();
registerLinkDiscoveryDebugCounters();
registerLinkDiscoveryDebugEvents();
}
@Override
@LogMessageDocs({
@LogMessageDoc(level = "ERROR",
message = "No storage source found.",
explanation = "Storage source was not initialized; cannot initialize "
+ "link discovery.",
recommendation = LogMessageDoc.REPORT_CONTROLLER_BUG),
@LogMessageDoc(level = "ERROR",
message = "Error in installing listener for "
+ "switch config table {table}",
explanation = "Failed to install storage notification for the "
+ "switch config table",
recommendation = LogMessageDoc.REPORT_CONTROLLER_BUG),
@LogMessageDoc(level = "ERROR",
message = "No storage source found.",
explanation = "Storage source was not initialized; cannot initialize "
+ "link discovery.",
recommendation = LogMessageDoc.REPORT_CONTROLLER_BUG),
@LogMessageDoc(level = "ERROR",
message = "Exception in LLDP send timer.",
explanation = "An unknown error occured while sending LLDP "
+ "messages to switches.",
recommendation = LogMessageDoc.CHECK_SWITCH) })
public void startUp(FloodlightModuleContext context) throws FloodlightModuleException {
// Initialize role to floodlight provider role.
this.role = floodlightProvider.getRole();
// Create our storage tables
if (storageSource == null) {
log.error("No storage source found.");
return;
}
storageSource.createTable(TOPOLOGY_TABLE_NAME, null);
storageSource.setTablePrimaryKeyName(TOPOLOGY_TABLE_NAME,
TOPOLOGY_ID);
readTopologyConfigFromStorage();
storageSource.createTable(LINK_TABLE_NAME, null);
storageSource.setTablePrimaryKeyName(LINK_TABLE_NAME, LINK_ID);
storageSource.deleteMatchingRows(LINK_TABLE_NAME, null);
// Register for storage updates for the switch table
try {
storageSource.addListener(SWITCH_CONFIG_TABLE_NAME, this);
storageSource.addListener(TOPOLOGY_TABLE_NAME, this);
} catch (StorageException ex) {
log.error("Error in installing listener for "
+ "switch table {}", SWITCH_CONFIG_TABLE_NAME);
}
ScheduledExecutorService ses = threadPool.getScheduledExecutor();
// To be started by the first switch connection
discoveryTask = new SingletonTask(ses, new Runnable() {
@Override
public void run() {
try {
discoverLinks();
} catch (StorageException e) {
log.error("Storage exception in LLDP send timer; "
+ "terminating process", e);
floodlightProvider.terminate();
} catch (Exception e) {
log.error("Exception in LLDP send timer.", e);
} finally {
if (!shuttingDown) {
// null role implies HA mode is not enabled.
if (role == null || role == Role.MASTER) {
log.trace("Rescheduling discovery task as role = {}",
role);
discoveryTask.reschedule(DISCOVERY_TASK_INTERVAL,
TimeUnit.SECONDS);
} else {
log.trace("Stopped LLDP rescheduling due to role = {}.",
role);
}
}
}
}
});
// null role implies HA mode is not enabled.
if (role == null || role == Role.MASTER) {
log.trace("Setup: Rescheduling discovery task. role = {}", role);
discoveryTask.reschedule(DISCOVERY_TASK_INTERVAL,
TimeUnit.SECONDS);
} else {
log.trace("Setup: Not scheduling LLDP as role = {}.", role);
}
// Setup the BDDP task. It is invoked whenever switch port tuples
// are added to the quarantine list.
bddpTask = new SingletonTask(ses, new QuarantineWorker());
bddpTask.reschedule(BDDP_TASK_INTERVAL, TimeUnit.MILLISECONDS);
updatesThread = new Thread(new Runnable() {
@Override
public void run() {
while (true) {
try {
doUpdatesThread();
} catch (InterruptedException e) {
return;
}
}
}
}, "Topology Updates");
updatesThread.start();
// Register for the OpenFlow messages we want to receive
floodlightProvider.addOFMessageListener(OFType.PACKET_IN, this);
floodlightProvider.addOFMessageListener(OFType.PORT_STATUS, this);
// Register for switch updates
floodlightProvider.addOFSwitchListener(this);
floodlightProvider.addHAListener(this.haListener);
floodlightProvider.addInfoProvider("summary", this);
if (restApi != null)
restApi.addRestletRoutable(new LinkDiscoveryWebRoutable());
setControllerTLV();
}
// ****************************************************
// Link Discovery DebugCounters and DebugEvents
// ****************************************************
private void registerLinkDiscoveryDebugCounters() throws FloodlightModuleException {
if (debugCounters == null) {
log.error("Debug Counter Service not found.");
debugCounters = new NullDebugCounter();
}
try {
ctrIncoming = debugCounters.registerCounter(PACKAGE, "incoming",
"All incoming packets seen by this module", CounterType.ALWAYS_COUNT);
ctrLldpEol = debugCounters.registerCounter(PACKAGE, "lldp-eol",
"End of Life for LLDP packets", CounterType.COUNT_ON_DEMAND);
ctrLinkLocalDrops = debugCounters.registerCounter(PACKAGE, "linklocal-drops",
"All link local packets dropped by this module",
CounterType.ALWAYS_COUNT);
ctrIgnoreSrcMacDrops = debugCounters.registerCounter(PACKAGE, "ignore-srcmac-drops",
"All packets whose srcmac is configured to be dropped by this module",
CounterType.ALWAYS_COUNT);
ctrQuarantineDrops = debugCounters.registerCounter(PACKAGE, "quarantine-drops",
"All packets arriving on quarantined ports dropped by this module",
CounterType.ALWAYS_COUNT, IDebugCounterService.CTR_MDATA_WARN);
} catch (CounterException e) {
throw new FloodlightModuleException(e.getMessage());
}
}
private void registerLinkDiscoveryDebugEvents() throws FloodlightModuleException {
if (debugEvents == null) {
log.error("Debug Event Service not found.");
debugEvents = new NullDebugEvent();
}
try {
evDirectLink = debugEvents.registerEvent(
PACKAGE, "linkevent",
"Direct OpenFlow links discovered or timed-out",
EventType.ALWAYS_LOG, DirectLinkEvent.class, 100);
} catch (MaxEventsRegistered e) {
throw new FloodlightModuleException("max events registered", e);
}
}
public class DirectLinkEvent {
@EventColumn(name = "srcSw", description = EventFieldType.DPID)
long srcDpid;
@EventColumn(name = "srcPort", description = EventFieldType.PRIMITIVE)
short srcPort;
@EventColumn(name = "dstSw", description = EventFieldType.DPID)
long dstDpid;
@EventColumn(name = "dstPort", description = EventFieldType.PRIMITIVE)
short dstPort;
@EventColumn(name = "reason", description = EventFieldType.STRING)
String reason;
public DirectLinkEvent(long srcDpid, short srcPort, long dstDpid,
short dstPort, String reason) {
this.srcDpid = srcDpid;
this.srcPort = srcPort;
this.dstDpid = dstDpid;
this.dstPort = dstPort;
this.reason = reason;
}
}
//*********************
// IInfoProvider
//*********************
@Override
public Map<String, Object> getInfo(String type) {
if (!"summary".equals(type)) return null;
Map<String, Object> info = new HashMap<String, Object>();
int numDirectLinks = 0;
for (Set<Link> links : switchLinks.values()) {
for (Link link : links) {
LinkInfo linkInfo = this.getLinkInfo(link);
if (linkInfo != null &&
linkInfo.getLinkType() == LinkType.DIRECT_LINK) {
numDirectLinks++;
}
}
}
info.put("# inter-switch links", numDirectLinks / 2);
info.put("# quarantine ports", quarantineQueue.size());
return info;
}
//***************
// IHAListener
//***************
private class HAListenerDelegate implements IHAListener {
@Override
public void transitionToMaster() {
if (log.isTraceEnabled()) {
log.trace("Sending LLDPs "
+ "to HA change from SLAVE->MASTER");
}
LinkDiscoveryManager.this.role = Role.MASTER;
clearAllLinks();
readTopologyConfigFromStorage();
log.debug("Role Change to Master: Rescheduling discovery task.");
discoveryTask.reschedule(1, TimeUnit.MICROSECONDS);
}
@Override
public void controllerNodeIPsChanged(Map<String, String> curControllerNodeIPs,
Map<String, String> addedControllerNodeIPs,
Map<String, String> removedControllerNodeIPs) {
// ignore
}
@Override
public String getName() {
return LinkDiscoveryManager.this.getName();
}
@Override
public boolean isCallbackOrderingPrereq(HAListenerTypeMarker type,
String name) {
return ("topology".equals(name));
}
@Override
public boolean isCallbackOrderingPostreq(HAListenerTypeMarker type,
String name) {
return "tunnelmanager".equals(name);
}
}
}