{nl,cfg,mac}80211: let userspace make meshif mesh gate

Allow userspace to set NL80211_MESHCONF_GATE_ANNOUNCEMENTS attribute,
which will advertise this mesh node as being a mesh gate.
NL80211_HWMP_ROOTMODE must be set or this will do nothing.

Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
index ae3de75..fd4f76a 100644
--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -1045,8 +1045,11 @@
 {
 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 	u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
+	u8 flags;
 
-	mesh_path_sel_frame_tx(MPATH_RANN, 0, sdata->vif.addr,
+	flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol)
+			? RANN_FLAG_IS_GATE : 0;
+	mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr,
 			       cpu_to_le32(++ifmsh->sn),
 			       0, NULL, 0, broadcast_addr,
 			       0, sdata->u.mesh.mshcfg.element_ttl,