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>
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 6d0fa8f..c0bb648 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -412,8 +412,8 @@
icmp_out_count(net, ((struct icmphdr *)
skb_transport_header(skb))->type);
- err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL,
- rt->dst.dev, dst_output);
+ err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, sk, skb,
+ NULL, rt->dst.dev, dst_output_sk);
if (err > 0)
err = net_xmit_errno(err);
if (err)