netdev - [PATCH net] vrf: prevent adding upper devices

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Date:   Tue, 26 Mar 2019 18:22:16 +0100
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     netdev@...r.kernel.org
Cc:     Sabrina Dubroca <sd@...asysnail.net>,
        David Ahern <dsahern@...il.com>
Subject: [PATCH net] vrf: prevent adding upper devices

VRF devices don't work with upper devices. Currently, it's possible to
add a VRF device to a bridge or team, and to create macvlan, macsec, or
ipvlan devices on top of a VRF (bond and vlan are prevented respectively
by the lack of an ndo_set_mac_address op and the NETIF_F_VLAN_CHALLENGED
feature flag).

Fix this by setting the IFF_NO_RX_HANDLER flag (introduced in commit
f5426250a6ec ("net: introduce IFF_NO_RX_HANDLER")).

Cc: David Ahern <dsahern@...il.com>
Fixes: 193125dbd8eb ("net: Introduce VRF device driver")
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
---
 drivers/net/vrf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 7c1430ed0244..6d1a1abbed27 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -1273,6 +1273,7 @@ static void vrf_setup(struct net_device *dev)

 	/* default to no qdisc; user can add if desired */
 	dev->priv_flags |= IFF_NO_QUEUE;
+	dev->priv_flags |= IFF_NO_RX_HANDLER;

 	dev->min_mtu = 0;
 	dev->max_mtu = 0;
-- 
2.21.0