use of org.onlab.packet.pim.PIMHello in project onos by opennetworkinglab.
the class PimInterface method processHello.
/**
* Process an incoming PIM Hello message. There are a few things going on in
* this method:
* <ul>
* <li>We <em>may</em> have to create a new neighbor if one does not already exist</li>
* <li>We <em>may</em> need to re-elect a new DR if new information is received</li>
* <li>We <em>may</em> need to send an existing neighbor all joins if the genid changed</li>
* <li>We will refresh the neighbor's timestamp</li>
* </ul>
*
* @param ethPkt the Ethernet packet header
*/
public void processHello(Ethernet ethPkt) {
if (log.isTraceEnabled()) {
log.trace("Received a PIM hello packet");
}
// We'll need to save our neighbors MAC address
MacAddress nbrmac = ethPkt.getSourceMAC();
// And we'll need to save neighbors IP Address.
IPv4 iphdr = (IPv4) ethPkt.getPayload();
IpAddress srcip = IpAddress.valueOf(iphdr.getSourceAddress());
PIM pimhdr = (PIM) iphdr.getPayload();
if (pimhdr.getPimMsgType() != PIM.TYPE_HELLO) {
log.error("process Hello has received a non hello packet type: " + pimhdr.getPimMsgType());
return;
}
// get the DR values for later calculation
PimNeighbor dr = pimNeighbors.get(drIpaddress);
checkNotNull(dr);
IpAddress drip = drIpaddress;
int drpri = dr.priority();
// Assume we do not need to run a DR election
boolean reElectDr = false;
boolean genidChanged = false;
PIMHello hello = (PIMHello) pimhdr.getPayload();
// Determine if we already have a PIMNeighbor
PimNeighbor nbr = pimNeighbors.getOrDefault(srcip, null);
PimNeighbor newNbr = PimNeighbor.createPimNeighbor(srcip, nbrmac, hello.getOptions().values());
if (nbr == null) {
pimNeighbors.putIfAbsent(srcip, newNbr);
nbr = newNbr;
} else if (!nbr.equals(newNbr)) {
if (newNbr.holdtime() == 0) {
// Neighbor has shut down. Remove them and clean up
pimNeighbors.remove(srcip, nbr);
return;
} else {
// Neighbor has changed one of their options.
pimNeighbors.put(srcip, newNbr);
nbr = newNbr;
}
}
// Refresh this neighbor's timestamp
nbr.refreshTimestamp();
/*
* the election method will first determine if an election
* needs to be run, if so it will run the election. The
* IP address of the DR will be returned. If the IP address
* of the DR is different from what we already have we know a
* new DR has been elected.
*/
IpAddress electedIp = election(nbr, drip, drpri);
if (!drip.equals(electedIp)) {
// we have a new DR.
drIpaddress = electedIp;
}
}
use of org.onlab.packet.pim.PIMHello in project onos by opennetworkinglab.
the class PIMTest method setUp.
/**
* Create PIM Hello and Join/Prune packets to be used in testing.
*
* @throws Exception if packet creation fails
*/
@Before
public void setUp() throws Exception {
// Create a PIM Hello
pimHello = new PIM();
pimHello.setVersion((byte) 2);
pimHello.setPIMType((byte) PIM.TYPE_HELLO);
pimHello.setChecksum((short) 0);
hello = new PIMHello();
hello.createDefaultOptions();
pimHello.setPayload(hello);
hello.setParent(pimHello);
// Create PIM Join Prune
pimJoinPrune = new PIM();
pimJoinPrune.setVersion((byte) 2);
pimJoinPrune.setPIMType((byte) PIM.TYPE_JOIN_PRUNE_REQUEST);
pimJoinPrune.setChecksum((short) 0);
joinPrune = new PIMJoinPrune();
joinPrune.setUpstreamAddr(new PIMAddrUnicast(SADDR));
joinPrune.addJoin(GADDR1, SADDR1);
joinPrune.addJoin(GADDR2, SADDR2);
joinPrune.addPrune(GADDR1, SADDR2);
joinPrune.addPrune(GADDR2, SADDR1);
pimJoinPrune.setPayload(joinPrune);
joinPrune.setParent(pimJoinPrune);
deserializer = PIM.deserializer();
}
use of org.onlab.packet.pim.PIMHello in project onos by opennetworkinglab.
the class PimInterface method sendHello.
/**
* Multicast a hello message out our interface. This hello message is sent
* periodically during the normal PIM Neighbor refresh time, as well as a
* result of a newly created interface.
*/
public void sendHello() {
if (lastHello + TimeUnit.SECONDS.toMillis(helloInterval) > System.currentTimeMillis()) {
return;
}
lastHello = System.currentTimeMillis();
// Create the base PIM Packet and mark it a hello packet
PimPacket pimPacket = new PimPacket(PIM.TYPE_HELLO);
// We need to set the source MAC and IPv4 addresses
pimPacket.setSrcMacAddr(onosInterface.mac());
pimPacket.setSrcIpAddress(Ip4Address.valueOf(getIpAddress().toOctets()));
// Create the hello message with options
PIMHello hello = new PIMHello();
hello.createDefaultOptions();
hello.addOption(PIMHelloOption.createHoldTime(holdtime));
hello.addOption(PIMHelloOption.createPriority(priority));
hello.addOption(PIMHelloOption.createGenID(generationId));
// Now set the hello option payload
pimPacket.setPimPayload(hello);
packetService.emit(new DefaultOutboundPacket(onosInterface.connectPoint().deviceId(), outputTreatment, ByteBuffer.wrap(pimPacket.getEthernet().serialize())));
}
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