netdev - lookup in fib tables with NETLINK_FIB

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Message-ID: <18970.41199.241372.614981@robur.slu.se>
Date:	Mon, 25 May 2009 15:45:19 +0200
From:	Robert Olsson <robert@...ur.slu.se>
To:	David Shwatrz <dshwatrz@...il.com>
Cc:	netdev@...r.kernel.org, Robert.Olsson@...a.slu.se
Subject: lookup in fib tables with NETLINK_FIB_LOOKUP

David Shwatrz writes:

 > I would appreciate if someone can write a short and brief explanation about
 > the usage of  NETLINK_FIB_LOOKUP. It enables to perform a fib_lookup()
 > via netlink.

 It is/was for verifying the route selection process from userland via netlink.
 This was added when fib_trie was introduced and in this case we're comparing 
 NETLINK_FIB_LOOKUP result with a userland program doing longest prefix match 
 on the same routing table. 

 > What's is its usage ? Are there any user space tools which use it ?

 Not what I'm aware of. We did a test program..

 > I grepped for "NETLINK_FIB_LOOKUP" under iproute2 source code and no hit.
 > Is there any difference between performing a lookup in the routing
 > tables (as "ip route ...")
 > and performing a lookup with NETLINK_FIB_LOOKUP?

 iproute normally dumps the table, it doesn't look up a particular route
 as done via the RX softirq.

 Cheers
					--ro

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