mac80211: implement the meshconf formation info field

The Mesh Configuration Formation Info field contains the number of
neighbors.  This means that the beacon must be updated every time a
peer joins or leaves.

Signed-off-by: Rui Paulo <rpaulo@gmail.com>
Signed-off-by: Javier Cardona <rpaulo@gmail.com>
Reviewed-by: Andrey Yurovsky <andrey@cozybit.com>
Tested-by: Brian Cavagnolo <brian@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 8 insertions, 3 deletions

diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index a49a3374acb1..79425182c290 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -223,6 +223,7 @@ void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
         struct ieee80211_supported_band *sband;
         u8 *pos;
         int len, i, rate;
+        u8 neighbors;
 
         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
         len = sband->n_bitrates;
@@ -271,9 +272,11 @@ void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
         /* Authentication Protocol identifier */
         *pos++ = sdata->u.mesh.mesh_auth_id;
 
-        /* Mesh Formation Info */
-        memset(pos, 0x00, 1);
-        pos += 1;
+        /* Mesh Formation Info - number of neighbors */
+        neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
+        /* Number of neighbor mesh STAs or 15 whichever is smaller */
+        neighbors = (neighbors > 15) ? 15 : neighbors;
+        *pos++ = neighbors << 1;
 
         /* Mesh capability */
         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c
index ffcbad75e09b..f98c8d23f581 100644
--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -65,6 +65,7 @@ void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
 {
         atomic_inc(&sdata->u.mesh.mshstats.estab_plinks);
         mesh_accept_plinks_update(sdata);
+        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 }
 
 static inline
@@ -72,6 +73,7 @@ void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
 {
         atomic_dec(&sdata->u.mesh.mshstats.estab_plinks);
         mesh_accept_plinks_update(sdata);
+        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 }
 
 /**