mac80211: support separate default keys

Add support for split default keys (unicast
and multicast) in mac80211.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 0ee56bb..157bde9 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -539,7 +539,11 @@
 		 ieee80211_is_robust_mgmt_frame(hdr) &&
 		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
 		tx->key = key;
-	else if ((key = rcu_dereference(tx->sdata->default_key)))
+	else if (is_multicast_ether_addr(hdr->addr1) &&
+		 (key = rcu_dereference(tx->sdata->default_multicast_key)))
+		tx->key = key;
+	else if (!is_multicast_ether_addr(hdr->addr1) &&
+		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
 		tx->key = key;
 	else if (tx->sdata->drop_unencrypted &&
 		 (tx->skb->protocol != tx->sdata->control_port_protocol) &&