tree 97f764e5c8587efcba64ad8d0edce9fee094e143
parent 04a0551c87363f100b04d28d7a15a632b70e18e7
author Mark McLoughlin <markmc@redhat.com> 1218838196 -0700
committer David S. Miller <davem@davemloft.net> 1218855139 -0700

tun: TUNGETIFF interface to query name and flags

Add a TUNGETIFF interface so that userspace can query a
tun/tap descriptor for its name and flags.

This is needed because it is common for one app to create
a tap interface, exec another app and pass it the file
descriptor for the interface. Without TUNGETIFF the spawned
app has no way of detecting wheter the interface has e.g.
IFF_VNET_HDR set.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Acked-by: Max Krasnyansky <maxk@qualcomm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>