Class L3Handler

java.lang.Object

L3Handler

All Implemented Interfaces:

L3ShimListener

public class L3Handler
extends java.lang.Object
implements L3ShimListener

This class represents a L3 object that can send and receive L3 frames. It receives packets from "below" as an L3ShimListener and passes packets up to any listener that has registered with it.

Constructor Summary

Constructors

Constructor and Description
L3Handler(Layer2Endpoint l2e, int netPart) Create a L3Handler, given a layer 2 endpoint, and the network part of the L3Address.

Method Summary

Modifier and Type	Method and Description
boolean	dropReceivedPacket(L3Packet pkt, java.lang.String bits) Drop any received packet that isn't for this interface.
L3Address	getAddr()
void	packetReceived(Layer2Endpoint l2e, java.lang.String bits) Called when the layer below receives bits successfully.
void	send(L3Packet pkt) Given a frame, convert it to a string of bits and send it using the L3Shim on layer 2 "below".
void	setListener(L3Listener l) Store a reference to a listener for packets received here.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

L3Handler

public L3Handler(Layer2Endpoint l2e,
                 int netPart)

Create a L3Handler, given a layer 2 endpoint, and the network part of the L3Address. The host part comes from the L2 address in the layer 2 endpoint. The code creates an L3Shim object (and storing it), sets itself as a listener for that object, and creates and stores the L3Address for this object, from the given netPart and layer 2's unique Mac address.

Method Detail

setListener

public void setListener(L3Listener l)

Store a reference to a listener for packets received here.

send

public void send(L3Packet pkt)

Given a frame, convert it to a string of bits and send it using the L3Shim on layer 2 "below".

dropReceivedPacket

public boolean dropReceivedPacket(L3Packet pkt,
                                  java.lang.String bits)

Drop any received packet that isn't for this interface. We'll override this in a router implementation that receives all packets and forwards packets not destined for it.

packetReceived

public void packetReceived(Layer2Endpoint l2e,
                           java.lang.String bits)

Called when the layer below receives bits successfully. Like the layer 2 implementation, it calls dropReceivedPacket to determine if the received packet should be dropped, instead of passed on through the listener packetReceived() callback to the higher layer.

Specified by:

packetReceived in interface L3ShimListener

getAddr

public L3Address getAddr()