netdev - [PATCH net] tap: Mark devices of type "tun" as IFF_DONT

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Date:	Wed,  4 Jun 2014 14:06:08 -0400
From:	Vlad Yasevich <vyasevic@...hat.com>
To:	netdev@...r.kernel.org
Cc:	Vlad Yasevich <vyasevic@...hat.com>
Subject: [PATCH net] tap: Mark devices of type "tun" as IFF_DONT_BRIDGE

Tun devices are layer 3 devices and do not work correctly
when bridged.  Mark then as IFF_DONT_BRIDGE so that people
trying to bridge will get an error.

Signed-off-by: Vlad Yasevich <vyasevic@...hat.com>
---
 drivers/net/tun.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index ee328ba..0161aa3 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -931,6 +931,7 @@ static void tun_net_init(struct net_device *dev)
 		/* Zero header length */
 		dev->type = ARPHRD_NONE;
 		dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
+		dev->priv_flags |= IFF_DONT_BRIDGE;
 		dev->tx_queue_len = TUN_READQ_SIZE;  /* We prefer our own queue length */
 		break;
 
-- 
1.9.0

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