1 files changed, 127 insertions, 0 deletions

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
new file mode 100644
index 000000000000..5d218c530a4e
--- /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;
+}