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Pekka Pietikäinen reports xt_socket behavioural change after commit
00028aa37098o (netfilter: xt_socket: use IP early demux).
Reason is xt_socket now no longer does an unconditional sk lookup -
it re-uses existing skb->sk if possible, assuming ->sk was set by
ip early demux.
However, when netfilter is invoked via bridge, this can cause 'bogus'
sockets to be examined by the match, e.g. a 'tun' device socket.
bridge netfilter should orphan the skb just like the routing path
before invoking ipv4/ipv6 netfilter hooks to avoid this.
Reported-and-tested-by: Pekka Pietikäinen <pp@ee.oulu.fi>
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
6b8dbcf2c4