net: dev_forward_skb should call nf_reset

With conn-track zones and probably with different network
namespaces, the netfilter logic needs to be re-calculated
on packet receive.  If the netfilter logic is not reset,
it will not be recalculated properly.  This patch adds
the nf_reset logic to dev_forward_skb.
Signed-off-by: NBen Greear <greearb@candelatech.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -1488,6 +1488,7 @@ static inline void net_timestamp_check(struct sk_buff *skb)
 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
 {
 	skb_orphan(skb);
+	nf_reset(skb);
 
 	if (!(dev->flags & IFF_UP) ||
 	    (skb->len > (dev->mtu + dev->hard_header_len))) {