Linux Question about snooping on ARP cache updates

[Jamie Esliger <Jamie.Esliger@xxxxxxxxxxxxxxxxx>]

First, I'll apologize if you consider this spam. 

  Now, to the point. 

  I have an application that snoops on router table updates using the
netlink socket.  This is fine for IP routes, but I also need to snoop on
updates to the ARP cache.  I would like to know if you know of an interface
I can use to listen for these updates.  I have hunted through the code in
net/ipv4 and net/core for awhile, and cannot find anything that sends this
information up to an application.  

Do you know of a solution for this without watching all packets and parsing
the ARP replies 
myself? 

I am trying "ARP Daemon" support (CONFIG_ARPD) but it is listed as obsolete
and
experimental, and I'm not sure that I can use this given I have to provide
my
application to many different customers, some of whom may not like the idea
of using an "obsolete and experimental" kernel.

  Thanks, 
  Jamie Esliger 
  Network Software Engineer