bpf, skb_do_redirect: clear sender_cpu before xmit

Similar to commit c29390c ("xps: must clear sender_cpu before
forwarding"), we also need to clear the skb->sender_cpu when moving
from RX to TX via skb_do_redirect() due to the shared location of
napi_id (used on RX) and sender_cpu (used on TX).

Fixes: 27b29f6 ("bpf: add bpf_redirect() helper")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/filter.c

@@ -1462,6 +1462,7 @@ int skb_do_redirect(struct sk_buff *skb)
 		return dev_forward_skb(dev, skb);
 
 	skb->dev = dev;
+	skb_sender_cpu_clear(skb);
 	return dev_queue_xmit(skb);
 }