netdev - [Patch net] loopback: explicitly set pkt_type to PACKET

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Message-Id: <1400092762-23287-1-git-send-email-xiyou.wangcong@gmail.com>
Date:	Wed, 14 May 2014 11:39:22 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Cong Wang <cwang@...pensource.com>
Subject: [Patch net] loopback: explicitly set pkt_type to PACKET_HOST

From: Cong Wang <cwang@...pensource.com>

In a corner case where I redirect the packets from veth to lo,
packets are dropped silently when entering IP stack. This is
due to we have a different MAC addr on veth, so the packets are
marked as PACKET_OTHERHOST. And after they are redirect to lo,
this value is kept since lo has the same MAC addr with the packets.
Loopback should explicitly set it to PACKET_HOST before calling
eth_type_trans() for this specific case.

Cc: David S. Miller <davem@...emloft.net>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
Signed-off-by: Cong Wang <cwang@...pensource.com>

---
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index bb96409..52b6625 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -81,6 +81,7 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
 	 */
 	skb_dst_force(skb);

+	skb->pkt_type = PACKET_HOST;
 	skb->protocol = eth_type_trans(skb, dev);

 	/* it's OK to use per_cpu_ptr() because BHs are off */
--
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