Merge branch 'neigh-mpls-prep'

Eric W. Biederman says:

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Neighbour table prep for MPLS

In preparation for using the IPv4 and IPv6 neighbour tables in my mpls
code this patchset factors out ___neigh_lookup_noref from
__ipv4_neigh_lookup_noref, __ipv6_lookup_noref and neigh_lookup.
Allowing the lookup logic to be shared between the different
implementations.  At what appears to be no cost. (Aka the same assembly
is generated for ip6_finish_output2 and ip_finish_output2).

After that I add a simple function that takes an address family and an
address consults the neighbour table and sends the packet to the
appropriate location.  The address family argument decoupls callers
of neigh_xmit from the addresses families the packets are sent over.
(Aka The ipv6 module can be loaded after mpls and a previously
configured ipv6 next hop will start working).

The refactoring in ___neigh_lookup_noref may be a bit overkill but it
feels like the right thing to do.  Especially since the same code is
generated.
====================

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

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