net: handle 802.1P vlan 0 packets properly
authorGovindarajulu Varadarajan <gvaradar@cisco.com>
Fri, 14 Jun 2019 13:13:54 +0000 (06:13 -0700)
committerDavid S. Miller <davem@davemloft.net>
Sun, 16 Jun 2019 20:45:14 +0000 (13:45 -0700)
commit36b2f61a42c29add695f3bd192ce44d5c113c1eb
tree55ed039374e1a7d90cb0a509bb091638ad3b4975
parent1eb4169c1e6b3c95f3a99c2c7f91b10e6c98e848
net: handle 802.1P vlan 0 packets properly

When stack receives pkt: [802.1P vlan 0][802.1AD vlan 100][IPv4],
vlan_do_receive() returns false if it does not find vlan_dev. Later
__netif_receive_skb_core() fails to find packet type handler for
skb->protocol 801.1AD and drops the packet.

801.1P header with vlan id 0 should be handled as untagged packets.
This patch fixes it by checking if vlan_id is 0 and processes next vlan
header.

Signed-off-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/dev.c