tree 3e11ed0f186ea6066a3f7efecb88d85bc732ee51
parent 1c984f8a5df085bcf35364a8a870bd4db4da4ed3
author David Miller <davem@davemloft.net> 1428286744 -0400
committer David S. Miller <davem@davemloft.net> 1428434755 -0400

netfilter: Pass socket pointer down through okfn().

On the output paths in particular, we have to sometimes deal with two
socket contexts.  First, and usually skb->sk, is the local socket that
generated the frame.

And second, is potentially the socket used to control a tunneling
socket, such as one the encapsulates using UDP.

We do not want to disassociate skb->sk when encapsulating in order
to fix this, because that would break socket memory accounting.

The most extreme case where this can cause huge problems is an
AF_PACKET socket transmitting over a vxlan device.  We hit code
paths doing checks that assume they are dealing with an ipv4
socket, but are actually operating upon the AF_PACKET one.

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