From: Daniel Borkmann <daniel@iogearbox.net>
Date: Wed, 7 Oct 2015 08:16:09 +0000 (+0200)
Subject: bpf, skb_do_redirect: clear sender_cpu before xmit
X-Git-Tag: v4.4-rc1~141^2~184
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=cfc81b50387086c3a1ca6d2be3c46561edfbc3b5;p=linux-2.6-block.git

bpf, skb_do_redirect: clear sender_cpu before xmit

Similar to commit c29390c6dfee ("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: 27b29f63058d ("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>
---

diff --git a/net/core/filter.c b/net/core/filter.c
index da3e5357f138..8f4603c712cd 100644
--- a/net/core/filter.c
+++ b/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);
 }