mac80211: backport wds station fix from r25378

git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@25379 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/mac80211/patches/580-mac80211_no_promisc_4addr.patch

@@ -0,0 +1,12 @@
+--- a/net/mac80211/rx.c
++++ b/net/mac80211/rx.c
+@@ -2609,7 +2609,8 @@ static int prepare_for_handlers(struct i
+ 			return 0;
+ 		if (!multicast &&
+ 		    compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) {
+-			if (!(sdata->dev->flags & IFF_PROMISC))
++			if (!(sdata->dev->flags & IFF_PROMISC) ||
++			    sdata->u.mgd.use_4addr)
+ 				return 0;
+ 			status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
+ 		}