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, 3 insertions, 1 deletions

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 8084b622e97e..dd8ec8d5e8b2 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -328,7 +328,9 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
         if (!wiphy)
                 return NULL;
 
-        wiphy->flags |= WIPHY_FLAG_NETNS_OK;
+        wiphy->flags |= WIPHY_FLAG_NETNS_OK |
+                        WIPHY_FLAG_4ADDR_AP |
+                        WIPHY_FLAG_4ADDR_STATION;
         wiphy->privid = mac80211_wiphy_privid;
 
         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */