@Override
public void onPacketReceived(PacketReceived potentialArp) {
Arp arp = ArpResolverUtils.getArpFrom(potentialArp);
if (arp != null) {
if (arp.getOperation() != ArpOperation.REPLY.intValue()) {
LOG.trace("Packet is not ARP REPLY packet.");
return;
}
if (LOG.isTraceEnabled()) {
LOG.trace("ARP REPLY received - {}", ArpUtils.getArpToStringFormat(arp));
}
NodeKey nodeKey = potentialArp.getIngress().getValue().firstKeyOf(Node.class, NodeKey.class);
if (nodeKey == null) {
LOG.info("Unknown source node of ARP packet: {}", potentialArp);
return;
}
Ipv4Address gatewayIpAddress = ArpUtils.bytesToIp(arp.getSenderProtocolAddress());
MacAddress gatewayMacAddress = ArpUtils.bytesToMac(arp.getSenderHardwareAddress());
ArpResolverMetadata candidateGatewayIp = gatewayToArpMetadataMap.get(gatewayIpAddress);
if (candidateGatewayIp != null) {
LOG.debug(
"Resolved MAC for Gateway Ip {} is {}",
gatewayIpAddress.getValue(),
gatewayMacAddress.getValue());
candidateGatewayIp.setGatewayMacAddress(gatewayMacAddress);
resetFlowToRemove(gatewayIpAddress, candidateGatewayIp);
}
}
}
/**
* Method do following actions: 1. Install flow to direct ARP response packet to controller 2.
* Send ARP request packet out on all port of the given External network bridge. 3. Cache the flow
* that need to be removed once ARP resolution is done. 4. Return listenable future so that user
* can add callback to get the MacAddress
*
* @param externalNetworkBridgeDpid Broadcast ARP request packet on this bridge
* @param gatewayIp IP address for which MAC need to be resolved
* @param sourceIpAddress Source Ip address for the ARP request packet
* @param sourceMacAddress Source Mac address for the ARP request packet
* @param periodicRefresh Enable/Disable periodic refresh of the Gateway Mac address
* @return Future object
*/
@Override
public ListenableFuture<MacAddress> resolveMacAddress(
final GatewayMacResolverListener gatewayMacResolverListener,
final Long externalNetworkBridgeDpid,
final Boolean refreshExternalNetworkBridgeDpidIfNeeded,
final Ipv4Address gatewayIp,
final Ipv4Address sourceIpAddress,
final MacAddress sourceMacAddress,
final Boolean periodicRefresh) {
Preconditions.checkNotNull(refreshExternalNetworkBridgeDpidIfNeeded);
Preconditions.checkNotNull(sourceIpAddress);
Preconditions.checkNotNull(sourceMacAddress);
Preconditions.checkNotNull(gatewayIp);
LOG.info(
"Trigger Mac resolution for gateway {}, using source ip {} and mac {}",
gatewayIp.getValue(),
sourceIpAddress.getValue(),
sourceMacAddress.getValue());
init();
if (gatewayToArpMetadataMap.containsKey(gatewayIp)) {
if (gatewayToArpMetadataMap.get(gatewayIp).getGatewayMacAddress() != null) {
return arpWatcherWall.submit(
new Callable<MacAddress>() {
@Override
public MacAddress call() throws Exception {
return gatewayToArpMetadataMap.get(gatewayIp).getGatewayMacAddress();
}
});
}
} else {
gatewayToArpMetadataMap.put(
gatewayIp,
new ArpResolverMetadata(
gatewayMacResolverListener,
externalNetworkBridgeDpid,
refreshExternalNetworkBridgeDpidIfNeeded,
gatewayIp,
sourceIpAddress,
sourceMacAddress,
periodicRefresh));
}
final Node externalNetworkBridge = getExternalBridge(externalNetworkBridgeDpid);
if (externalNetworkBridge == null) {
if (!refreshExternalNetworkBridgeDpidIfNeeded) {
LOG.error(
"MAC address for gateway {} can not be resolved, because external bridge {} "
+ "is not connected to controller.",
gatewayIp.getValue(),
externalNetworkBridgeDpid);
} else {
LOG.debug(
"MAC address for gateway {} can not be resolved, since dpid was not refreshed yet",
gatewayIp.getValue());
}
return null;
}
sendGatewayArpRequest(externalNetworkBridge, gatewayIp, sourceIpAddress, sourceMacAddress);
// Wait for MacAddress population in cache
return waitForMacAddress(gatewayIp);
}