tun: remove bogus hardware vlan acceleration flags from vlan_features
authorFernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Tue, 18 Feb 2014 12:20:09 +0000 (21:20 +0900)
committerDavid S. Miller <davem@davemloft.net>
Thu, 20 Feb 2014 07:15:38 +0000 (02:15 -0500)
Even though only the outer vlan tag can be HW accelerated in the transmission
path, in the TUN/TAP driver vlan_features mirrors hw_features, which happens
to have the NETIF_F_HW_VLAN_?TAG_TX flags set. Because of this, during packet
tranmisssion through a stacked vlan device dev_hard_start_xmit, (incorrectly)
assuming that the vlan device supports hardware vlan acceleration, does not
add the vlan header to the skb payload and the inner vlan tags are lost
(vlan_tci contains the outer vlan tag when userspace reads the packet from
the tap device).

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/tun.c

index 8fe9cb7d0f72e9fb7d34307f9a12797772844db1..26f8635b027d3fb44ab12223000badc214098df0 100644 (file)
@@ -1686,7 +1686,9 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
                                   TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
                                   NETIF_F_HW_VLAN_STAG_TX;
                dev->features = dev->hw_features;
-               dev->vlan_features = dev->features;
+               dev->vlan_features = dev->features &
+                                    ~(NETIF_F_HW_VLAN_CTAG_TX |
+                                      NETIF_F_HW_VLAN_STAG_TX);
 
                INIT_LIST_HEAD(&tun->disabled);
                err = tun_attach(tun, file, false);