Merge branch 'l2tp-rework-pppol2tp-ioctl-handling'

Guillaume Nault says:

====================
l2tp: rework pppol2tp ioctl handling

The current ioctl() handling code can be simplified. It tests for
non-relevant conditions and uselessly holds sockets. Once useless
code is removed, it becomes even simpler to let pppol2tp_ioctl() handle
commands directly, rather than dispatch them to pppol2tp_tunnel_ioctl()
or pppol2tp_session_ioctl(). That is the approach taken by this series.

Patch #1 and #2 define helper functions aimed at simplifying the rest
of the patch set.

Patch #3 drops useless tests in pppol2p_ioctl() and avoid holding a
refcount on the socket.

Patches #4, #5 and #6 are the core of the series. They let
pppol2tp_ioctl() handle all ioctls and drop the tunnel and session
specific functions.

Then patch #6 brings a little bit of consolidation.

Finally, patch #7 takes advantage of the simplified code to make
pppol2tp sockets compatible with dev_ioctl(). Certainly not a killer
feature, but it is trivial and it is always nice to see l2tp getting
better integration with the rest of the stack.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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