cfg80211: introduce capability for 4addr mode

It's very likely that not many devices will support
four-address mode in station or AP mode so introduce
capability bits for both modes, set them in mac80211
and check them when userspace tries to use the mode.
Also, keep track of 4addr in cfg80211 (wireless_dev)
and not in mac80211 any more. mac80211 can also be
improved for the VLAN case by not looking at the
4addr flag but maintaining the station pointer for
it correctly. However, keep track of use_4addr for
station mode in mac80211 to avoid all the derefs.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 87d27f450a05..f13d76c9b575 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -312,6 +312,8 @@ struct ieee80211_if_managed {
         } mfp; /* management frame protection */
 
         int wmm_last_param_set;
+
+        u8 use_4addr;
 };
 
 enum ieee80211_ibss_request {
@@ -459,8 +461,6 @@ struct ieee80211_sub_if_data {
         int force_unicast_rateidx; /* forced TX rateidx for unicast frames */
         int max_ratectrl_rateidx; /* max TX rateidx for rate control */
 
-        bool use_4addr; /* use 4-address frames */
-
         union {
                 struct ieee80211_if_ap ap;
                 struct ieee80211_if_wds wds;