Re: [PATCH 5.10 380/530] udp: never accept GSO_FRAGLIST packets

Hi!

From: Paolo Abeni <pabeni@redhat.com>

[ Upstream commit 78352f73dc5047f3f744764cc45912498c52f3c9 ]

Currently the UDP protocol delivers GSO_FRAGLIST packets to
the sockets without the expected segmentation.

This change addresses the issue introducing and maintaining
a couple of new fields to explicitly accept SKB_GSO_UDP_L4
or GSO_FRAGLIST packets. Additionally updates  udp_unexpected_gso()
accordingly.

UDP sockets enabling UDP_GRO stil keep accept_udp_fraglist
zeroed.

What is going on here? accept_udp_fraglist variable is read-only.

Should this be dropped? Should 

commit d18931a92a0b5feddd8a39d097b90ae2867db02f
    vxlan: allow L4 GRO passthrough
    
be cherry-picked?

Best regards,
							Pavel
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