Merge branch 'frag-udp-tunneled-skbs'

Shmulik Ladkani says:

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net: Consider fragmentation of udp tunneled skbs in 'ip_finish_output_gso'

Currently IP fragmentation of GSO segments that exceed dst mtu is
considered only in the ipv4 forwarding case.

There are cases where GSO skbs that are bridged and then udp-tunneled
may have gso_size exceeding the egress device mtu.
It makes sense to fragment them, as in the non GSOed code path.

The exact cases where this behavior is needed is described and addressed
in the 2nd patch.
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Signed-off-by: David S. Miller <davem@davemloft.net>