nl80211: Parse channel type attribute in an ibss join request

Prepare cfg80211 for IBSS HT:
 * extend cfg80211 ibss struct with channel_type
 * Check if extension channel can be used
 * Export can_beacon_sec_chan for use in mac80211 (will be called
   from ibss.c later).

Signed-off-by: Alexander Simon <an.alexsimon@googlemail.com>
[siwu@hrz.tu-chemnitz.de: Updates]
* fix cfg80211_can_beacon_ext_chan comment
* remove implicit channel_type enum assumptions
* remove radar channel flags check
* add HT IBSS feature flag
* reword commit message

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index f51e3bf93a9..a18760684fc 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -2785,9 +2785,11 @@ enum nl80211_ap_sme_features {
  * @NL80211_FEATURE_SK_TX_STATUS: This driver supports reflecting back
  *      TX status to the socket error queue when requested with the
  *      socket option.
+ * @NL80211_FEATURE_HT_IBSS: This driver supports IBSS with HT datarates.
  */
 enum nl80211_feature_flags {
         NL80211_FEATURE_SK_TX_STATUS    = 1 << 0,
+        NL80211_FEATURE_HT_IBSS         = 1 << 1,
 };
 
 /**
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index f0e82b2e422..3de1c39d03e 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1149,6 +1149,7 @@ struct cfg80211_ibss_params {
         u8 *ssid;
         u8 *bssid;
         struct ieee80211_channel *channel;
+        enum nl80211_channel_type channel_type;
         u8 *ie;
         u8 ssid_len, ie_len;
         u16 beacon_interval;
@@ -3267,6 +3268,16 @@ void cfg80211_report_obss_beacon(struct wiphy *wiphy,
                                  const u8 *frame, size_t len,
                                  int freq, gfp_t gfp);
 
+/*
+ * cfg80211_can_beacon_sec_chan - test if ht40 on extension channel can be used
+ * @wiphy: the wiphy
+ * @chan: main channel
+ * @channel_type: HT mode
+ */
+int cfg80211_can_beacon_sec_chan(struct wiphy *wiphy,
+                                 struct ieee80211_channel *chan,
+                                 enum nl80211_channel_type channel_type);
+
 /* Logging, debugging and troubleshooting/diagnostic helpers. */
 
 /* wiphy_printk helpers, similar to dev_printk */