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>

1 files changed, 5 insertions, 5 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 3b3965288f52..b2775f06c710 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2879,7 +2879,7 @@ EXPORT_SYMBOL(xmit_recursion);
  *      dev_loopback_xmit - loop back @skb
  *      @skb: buffer to transmit
  */
-int dev_loopback_xmit(struct sk_buff *skb)
+int dev_loopback_xmit(struct sock *sk, struct sk_buff *skb)
 {
         skb_reset_mac_header(skb);
         __skb_pull(skb, skb_network_offset(skb));
@@ -3017,11 +3017,11 @@ out:
         return rc;
 }
 
-int dev_queue_xmit(struct sk_buff *skb)
+int dev_queue_xmit_sk(struct sock *sk, struct sk_buff *skb)
 {
         return __dev_queue_xmit(skb, NULL);
 }
-EXPORT_SYMBOL(dev_queue_xmit);
+EXPORT_SYMBOL(dev_queue_xmit_sk);
 
 int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv)
 {
@@ -3853,13 +3853,13 @@ static int netif_receive_skb_internal(struct sk_buff *skb)
  *      NET_RX_SUCCESS: no congestion
  *      NET_RX_DROP: packet was dropped
  */
-int netif_receive_skb(struct sk_buff *skb)
+int netif_receive_skb_sk(struct sock *sk, struct sk_buff *skb)
 {
         trace_netif_receive_skb_entry(skb);
 
         return netif_receive_skb_internal(skb);
 }
-EXPORT_SYMBOL(netif_receive_skb);
+EXPORT_SYMBOL(netif_receive_skb_sk);
 
 /* Network device is going away, flush any packets still pending
  * Called with irqs disabled.