1 files changed, 127 insertions, 0 deletions
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
new file mode 100644
index 0000000..5d218c5
--- /dev/null
+++ b/net/mac80211/chan.c
@@ -0,0 +1,127 @@
+/*
+ * mac80211 - channel management
+ */
+
+#include <linux/nl80211.h>
+#include "ieee80211_i.h"
+
+enum ieee80211_chan_mode
+__ieee80211_get_channel_mode(struct ieee80211_local *local,
+			     struct ieee80211_sub_if_data *ignore)
+{
+	struct ieee80211_sub_if_data *sdata;
+
+	WARN_ON(!mutex_is_locked(&local->iflist_mtx));
+
+	list_for_each_entry(sdata, &local->interfaces, list) {
+		if (sdata == ignore)
+			continue;
+
+		if (!ieee80211_sdata_running(sdata))
+			continue;
+
+		if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
+			continue;
+
+		if (sdata->vif.type == NL80211_IFTYPE_STATION &&
+		    !sdata->u.mgd.associated)
+			continue;
+
+		if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+			if (!sdata->u.ibss.ssid_len)
+				continue;
+			if (!sdata->u.ibss.fixed_channel)
+				return CHAN_MODE_HOPPING;
+		}
+
+		if (sdata->vif.type == NL80211_IFTYPE_AP &&
+		    !sdata->u.ap.beacon)
+			continue;
+
+		return CHAN_MODE_FIXED;
+	}
+
+	return CHAN_MODE_UNDEFINED;
+}
+
+enum ieee80211_chan_mode
+ieee80211_get_channel_mode(struct ieee80211_local *local,
+			   struct ieee80211_sub_if_data *ignore)
+{
+	enum ieee80211_chan_mode mode;
+
+	mutex_lock(&local->iflist_mtx);
+	mode = __ieee80211_get_channel_mode(local, ignore);
+	mutex_unlock(&local->iflist_mtx);
+
+	return mode;
+}
+
+bool ieee80211_set_channel_type(struct ieee80211_local *local,
+				struct ieee80211_sub_if_data *sdata,
+				enum nl80211_channel_type chantype)
+{
+	struct ieee80211_sub_if_data *tmp;
+	enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT;
+	bool result;
+
+	mutex_lock(&local->iflist_mtx);
+
+	list_for_each_entry(tmp, &local->interfaces, list) {
+		if (tmp == sdata)
+			continue;
+
+		if (!ieee80211_sdata_running(tmp))
+			continue;
+
+		switch (tmp->vif.bss_conf.channel_type) {
+		case NL80211_CHAN_NO_HT:
+		case NL80211_CHAN_HT20:
+			superchan = tmp->vif.bss_conf.channel_type;
+			break;
+		case NL80211_CHAN_HT40PLUS:
+			WARN_ON(superchan == NL80211_CHAN_HT40MINUS);
+			superchan = NL80211_CHAN_HT40PLUS;
+			break;
+		case NL80211_CHAN_HT40MINUS:
+			WARN_ON(superchan == NL80211_CHAN_HT40PLUS);
+			superchan = NL80211_CHAN_HT40MINUS;
+			break;
+		}
+	}
+
+	switch (superchan) {
+	case NL80211_CHAN_NO_HT:
+	case NL80211_CHAN_HT20:
+		/*
+		 * allow any change that doesn't go to no-HT
+		 * (if it already is no-HT no change is needed)
+		 */
+		if (chantype == NL80211_CHAN_NO_HT)
+			break;
+		superchan = chantype;
+		break;
+	case NL80211_CHAN_HT40PLUS:
+	case NL80211_CHAN_HT40MINUS:
+		/* allow smaller bandwidth and same */
+		if (chantype == NL80211_CHAN_NO_HT)
+			break;
+		if (chantype == NL80211_CHAN_HT20)
+			break;
+		if (superchan == chantype)
+			break;
+		result = false;
+		goto out;
+	}
+
+	local->_oper_channel_type = superchan;
+
+	if (sdata)
+		sdata->vif.bss_conf.channel_type = chantype;
+
+	result = true;
+ out:
+	mutex_unlock(&local->iflist_mtx);
+
+	return result;
+}