{nl,cfg,mac}80211: Implement RSSI threshold for mesh peering
Mesh peer links are established only if average rssi of the peer
candidate satisfies the threshold. This is not in 802.11s specification
but was requested by David Fulgham, an open80211s user. This is a way to avoid
marginal peer links with stations that are barely within range.
This patch adds a new mesh configuration parameter, mesh_rssi_threshold. This
feature is supported only for hardwares that report signal in dBm.
Signed-off-by: Ashok Nagarajan <ashok@cozybit.com>
Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c
index 8806e5e..80ce527 100644
--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -31,6 +31,11 @@
#define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout)
#define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks)
+#define sta_meets_rssi_threshold(sta, sdata) \
+ (sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\
+ (s8) -ewma_read(&sta->avg_signal) > \
+ sdata->u.mesh.mshcfg.rssi_threshold)
+
enum plink_event {
PLINK_UNDEFINED,
OPN_ACPT,
@@ -301,7 +306,8 @@
if (mesh_peer_accepts_plinks(elems) &&
sta->plink_state == NL80211_PLINK_LISTEN &&
sdata->u.mesh.accepting_plinks &&
- sdata->u.mesh.mshcfg.auto_open_plinks)
+ sdata->u.mesh.mshcfg.auto_open_plinks &&
+ sta_meets_rssi_threshold(sta, sdata))
mesh_plink_open(sta);
rcu_read_unlock();
@@ -531,6 +537,14 @@
return;
}
+ if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
+ !sta_meets_rssi_threshold(sta, sdata)) {
+ mpl_dbg("Mesh plink: %pM does not meet rssi threshold\n",
+ sta->sta.addr);
+ rcu_read_unlock();
+ return;
+ }
+
if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) {
mpl_dbg("Mesh plink: Action frame from non-authed peer\n");
rcu_read_unlock();