openwrt-xburst/package/madwifi/patches/387-maxassoc.patch

--- a/net80211/ieee80211_var.h
+++ b/net80211/ieee80211_var.h
@@ -198,6 +198,7 @@ struct ieee80211vap {
 	u_int32_t iv_debug;				/* debug msg flags */
 	struct ieee80211_stats iv_stats;		/* statistics */
 
+	int iv_max_nodes;
 	int iv_monitor_nods_only;			/* in monitor mode only nods traffic */
 	int iv_monitor_txf_len;				/* in monitor mode, truncate tx packets */
 	int iv_monitor_phy_errors;			/* in monitor mode, accept phy errors */
--- a/net80211/ieee80211_ioctl.h
+++ b/net80211/ieee80211_ioctl.h
@@ -650,6 +650,7 @@ enum {
 	IEEE80211_PARAM_RSSI_DIS_THR	= 80,	/* rssi threshold for disconnection */
 	IEEE80211_PARAM_RSSI_DIS_COUNT	= 81,	/* counter for rssi threshold */
 	IEEE80211_PARAM_WDS_SEP			= 82,	/* move wds stations into separate interfaces */
+	IEEE80211_PARAM_MAXASSOC		= 83,	/* maximum associated stations */
 };
 
 #define	SIOCG80211STATS			(SIOCDEVPRIVATE+2)
--- a/net80211/ieee80211_wireless.c
+++ b/net80211/ieee80211_wireless.c
@@ -2875,6 +2875,12 @@ ieee80211_ioctl_setparam(struct net_devi
 		else
 			vap->iv_flags_ext &= ~IEEE80211_FEXT_WDSSEP;
 		break;
+	case IEEE80211_PARAM_MAXASSOC:
+		if (vap->iv_opmode != IEEE80211_M_HOSTAP)
+			retv = -EINVAL;
+		else
+			vap->iv_max_nodes = value;
+		break;
 #ifdef ATH_REVERSE_ENGINEERING
 	case IEEE80211_PARAM_DUMPREGS:
 		ieee80211_dump_registers(dev, info, w, extra);
@@ -3234,6 +3240,9 @@ ieee80211_ioctl_getparam(struct net_devi
 	case IEEE80211_PARAM_WDS_SEP:
 		param[0] = !!(vap->iv_flags_ext & IEEE80211_FEXT_WDSSEP);
 		break;
+	case IEEE80211_PARAM_MAXASSOC:
+		param[0] = vap->iv_max_nodes;
+		break;
 	default:
 		return -EOPNOTSUPP;
 	}
@@ -5789,6 +5798,10 @@ static const struct iw_priv_args ieee802
 	 IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "wdssep"},
 	{ IEEE80211_PARAM_WDS_SEP,
 	 0, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "get_wdssep"},
+	{ IEEE80211_PARAM_MAXASSOC,
+	 IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "maxassoc"},
+	{ IEEE80211_PARAM_MAXASSOC,
+	 0, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "get_maxassoc"},
 
 #ifdef ATH_REVERSE_ENGINEERING
 	/*
--- a/net80211/ieee80211_input.c
+++ b/net80211/ieee80211_input.c
@@ -4020,7 +4020,26 @@ ieee80211_recv_mgmt(struct ieee80211vap
 			vap->iv_stats.is_rx_assoc_norate++;
 			return;
 		}
+		if (vap->iv_max_nodes > 0) {
+			unsigned int active_nodes = 0;
+			struct ieee80211_node *tni;
 
+			IEEE80211_NODE_TABLE_LOCK_IRQ(&ic->ic_sta);
+			TAILQ_FOREACH(tni, &ic->ic_sta.nt_node, ni_list) {
+				if (tni->ni_vap != vap)
+					continue;
+				if (tni->ni_associd == 0)
+					continue;
+				active_nodes++;
+			}
+			IEEE80211_NODE_TABLE_UNLOCK_IRQ(&ic->ic_sta);
+
+			if (active_nodes >= vap->iv_max_nodes) {
+				/* too many nodes connected */
+				ieee80211_node_leave(ni);
+				return;
+			}
+		}
 		if (ni->ni_associd != 0 &&
 		    IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan)) {
 			if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)