tree cf4ad1600694c60733d7696727d7112acbc6e85c
parent cfbf654efc6d78dc9812e030673b86f235bf677d
author Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> 1422531427 +0900
committer David S. Miller <davem@davemloft.net> 1422669827 -0800

net: Fix vlan_get_protocol for stacked vlan

vlan_get_protocol() could not get network protocol if a skb has a 802.1ad
vlan tag or multiple vlans, which caused incorrect checksum calculation
in several drivers.

Fix vlan_get_protocol() to retrieve network protocol instead of incorrect
vlan protocol.

As the logic is the same as skb_network_protocol(), create a common helper
function __vlan_get_protocol() and call it from existing functions.

Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>