mac80211_hwsim: Check idle state on TX

Track the idle state for hwsim radios and reject TX if mac80211 is
trying to transmit something when the radio is supposed to be idle. In
addition, do not deliver frames if the receiving radio is in the idle
state.
Signed-off-by: NJouni Malinen <j@w1.fi>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mac80211_hwsim.c

@@ -284,7 +284,7 @@ struct mac80211_hwsim_data {
 	struct ieee80211_channel *channel;
 	unsigned long beacon_int; /* in jiffies unit */
 	unsigned int rx_filter;
-	int started;
+	bool started, idle;
 	struct timer_list beacon_timer;
 	enum ps_mode {
 		PS_DISABLED, PS_ENABLED, PS_AUTO_POLL, PS_MANUAL_POLL
@@ -402,6 +402,12 @@ static bool mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 	struct ieee80211_rx_status rx_status;
 
+	if (data->idle) {
+		printk(KERN_DEBUG "%s: Trying to TX when idle - reject\n",
+		       wiphy_name(hw->wiphy));
+		return false;
+	}
+
 	memset(&rx_status, 0, sizeof(rx_status));
 	/* TODO: set mactime */
 	rx_status.freq = data->channel->center_freq;
@@ -428,7 +434,8 @@ static bool mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
 		if (data == data2)
 			continue;
 
-		if (!data2->started || !hwsim_ps_rx_ok(data2, skb) ||
+		if (data2->idle || !data2->started ||
+		    !hwsim_ps_rx_ok(data2, skb) ||
 		    !data->channel || !data2->channel ||
 		    data->channel->center_freq != data2->channel->center_freq ||
 		    !(data->group & data2->group))
@@ -571,6 +578,8 @@ static int mac80211_hwsim_config(struct ieee80211_hw *hw, u32 changed)
 	       !!(conf->flags & IEEE80211_CONF_IDLE),
 	       !!(conf->flags & IEEE80211_CONF_PS));
 
+	data->idle = !!(conf->flags & IEEE80211_CONF_IDLE);
+
 	data->channel = conf->channel;
 	if (!data->started || !data->beacon_int)
 		del_timer(&data->beacon_timer);