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net: 8021q: skip packets if the vlan is down 

If the vlan is down, free the packet instead of proceeding with other
processing, or counting it as received.  If vlan interfaces are used
as slaves for bonding, with arp monitoring for connectivity, if the rx
counter is seen to be incrementing, then the bond device will not
observe that the interface is down.

CC: David S. Miller <davem@davemloft.net>
Signed-off-by: Vishakha Narvekar <Vishakha.Narvekar@dell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Vishakha Narvekar 2017-10-03 16:13:29 -04:00 committed by David S. Miller
parent 90caccdd8c
commit e769fcec6b
1 changed files with 6 additions and 0 deletions
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6
net/8021q/vlan_core.c
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@ -21,6 +21,12 @@ bool vlan_do_receive(struct sk_buff **skbp)
if (unlikely(!skb))
return false;
if (unlikely(!(vlan_dev->flags & IFF_UP))) {
kfree_skb(skb);
*skbp = NULL;
return false;
}
skb->dev = vlan_dev;
if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) {
/* Our lower layer thinks this is not local, let's make sure.