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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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10
net/core/dev.c
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@@ -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.