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netfilter: Pass socket pointer down through okfn().

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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>
This commit is contained in:
David Miller 2015-04-05 22:19:04 -04:00 • committed by David S. Miller
parent 1c984f8a5d
commit 7026b1ddb6
39 changed files with 277 additions and 218 deletions
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3
net/bridge/br_multicast.c
View file

@ -814,7 +814,8 @@ static void __br_multicast_send_query(struct net_bridge *br,
if (port) {
skb->dev = port->dev;
NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, NULL, skb,
NULL, skb->dev,
br_dev_queue_push_xmit);
} else {
br_multicast_select_own_querier(br, ip, skb);