tree 5cad911d4da073b55b1a21418d9bf1991ac9197d
parent 0de4ba9401cd005639bc1865a53e07de60356aeb
author Jonathan Hart <jono@onlab.us> 1470702061 -0700
committer Gerrit Code Review <gerrit@onlab.us> 1471537099 +0000

Abstraction to help applications write logic to handle ARP + NDP packets.

The idea is to allow applications to contribute NeighbourMessageHandlers to
handle ARP/NDP packets coming from a particular ConnectPoint, Interface or with
a particular traffic selector. Applications can contribute different handlers
for different ports, because they know how those ports will be used. Also,
multiple applications can contribute handlers for different ports/interfaces
without having to have one ARP handler for the entire network. The framework
provides actions that the handler can choose to take - flood, proxy, reply, drop.
The handler is free to implement some other action if none of these fit what it
needs to do. The framework also handles many of the common tasks for ARP handlers,
like parsing packets, abstracting the differences between ARP and NDP, implementing
actions like replying to a request. This allows handlers to be very simple and
easy to understand and implement.

Change-Id: I313c723e9ebc3d0816eb79870ee0536780e7a640