mac80211: use fixed broadcast address

The netdev broadcast address cannot change from
all-ones so there's no need to use it; we can
instead hard-code it. Since we already have an
instance in tkip.c, which will be shared if it
is marked static const, doing this reduces text
size at no data/bss cost.

The real motivation for this is, of course, the
desire to get rid of almost all uses of netdevs
in mac80211 so that auditing their use becomes
easier.

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

1 files changed, 11 insertions, 9 deletions

diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
index 5c67e7b..d930198 100644
--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -101,10 +101,12 @@ enum mpath_frame_type {
 	MPATH_RANN
 };
 
+static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+
 static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
 		u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target,
-		__le32 target_sn, u8 *da, u8 hop_count, u8 ttl,__le32 lifetime,
-		__le32 metric, __le32 preq_id,
+		__le32 target_sn, const u8 *da, u8 hop_count, u8 ttl,
+		__le32 lifetime, __le32 metric, __le32 preq_id,
 		struct ieee80211_sub_if_data *sdata)
 {
 	struct ieee80211_local *local = sdata->local;
@@ -198,8 +200,8 @@ static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
  * @ra: node this frame is addressed to
  */
 int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn,
-		__le16 target_rcode, u8 *ra,
-		struct ieee80211_sub_if_data *sdata)
+		       __le16 target_rcode, const u8 *ra,
+		       struct ieee80211_sub_if_data *sdata)
 {
 	struct ieee80211_local *local = sdata->local;
 	struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
@@ -548,7 +550,7 @@ static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
 		hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
 		mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
 				cpu_to_le32(orig_sn), target_flags, target_addr,
-				cpu_to_le32(target_sn), sdata->dev->broadcast,
+				cpu_to_le32(target_sn), broadcast_addr,
 				hopcount, ttl, cpu_to_le32(lifetime),
 				cpu_to_le32(metric), cpu_to_le32(preq_id),
 				sdata);
@@ -660,7 +662,7 @@ static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
 			spin_unlock_bh(&mpath->state_lock);
 			mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn),
 					   cpu_to_le16(target_rcode),
-					   sdata->dev->broadcast, sdata);
+					   broadcast_addr, sdata);
 		} else
 			spin_unlock_bh(&mpath->state_lock);
 	}
@@ -709,7 +711,7 @@ static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
 	if (mpath->sn < orig_sn) {
 		mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
 				       cpu_to_le32(orig_sn),
-				       0, NULL, 0, sdata->dev->broadcast,
+				       0, NULL, 0, broadcast_addr,
 				       hopcount, ttl, 0,
 				       cpu_to_le32(metric + mpath->metric),
 				       0, sdata);
@@ -890,7 +892,7 @@ void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
 	spin_unlock_bh(&mpath->state_lock);
 	mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->dev->dev_addr,
 			cpu_to_le32(ifmsh->sn), target_flags, mpath->dst,
-			cpu_to_le32(mpath->sn), sdata->dev->broadcast, 0,
+			cpu_to_le32(mpath->sn), broadcast_addr, 0,
 			ttl, cpu_to_le32(lifetime), 0,
 			cpu_to_le32(ifmsh->preq_id++), sdata);
 	mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
@@ -1011,6 +1013,6 @@ mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)
 
 	mesh_path_sel_frame_tx(MPATH_RANN, 0, sdata->dev->dev_addr,
 			       cpu_to_le32(++ifmsh->sn),
-			       0, NULL, 0, sdata->dev->broadcast,
+			       0, NULL, 0, broadcast_addr,
 			       0, MESH_TTL, 0, 0, 0, sdata);
 }