From: Petr Machata <petrm@mellanox.com>
Date: Fri, 22 Nov 2019 15:47:21 +0000
Subject: net: flow_dissector: Wrap unionized VLAN fields in a struct
Patch-mainline: v5.5-rc1
Git-commit: d1746d1e80a86ca86b0c2680510898d411d2ef47
References: bsc#1176447

In commit a82055af5959 ("netfilter: nft_payload: add VLAN offload
support"), VLAN fields in struct flow_dissector_key_vlan were unionized
with the intention of introducing another field that covered the whole TCI
header. However without a wrapping struct the subfields end up sharing the
same bits. As a result, "tc filter add ... flower vlan_id 14" specifies not
only vlan_id, but also vlan_priority.

Fix by wrapping the individual VLAN fields in a struct.

Fixes: a82055af5959 ("netfilter: nft_payload: add VLAN offload support")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/net/flow_dissector.h |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -49,9 +49,11 @@ struct flow_dissector_key_tags {
 
 struct flow_dissector_key_vlan {
 	union {
-		u16	vlan_id:12,
-			vlan_dei:1,
-			vlan_priority:3;
+		struct {
+			u16	vlan_id:12,
+				vlan_dei:1,
+				vlan_priority:3;
+		};
 		__be16	vlan_tci;
 	};
 	__be16	vlan_tpid;