nl80211/cfg80211: add channel switch command

To allow channel switch announcements within beacons, add
the channel switch command to nl80211/cfg80211. This is
implementation is intended for AP and (later) IBSS mode.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index aeaf6dff6e05..b7495c72061c 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -666,6 +666,30 @@ struct cfg80211_ap_settings {
 };
 
 /**
+ * struct cfg80211_csa_settings - channel switch settings
+ *
+ * Used for channel switch
+ *
+ * @chandef: defines the channel to use after the switch
+ * @beacon_csa: beacon data while performing the switch
+ * @counter_offset_beacon: offset for the counter within the beacon (tail)
+ * @counter_offset_presp: offset for the counter within the probe response
+ * @beacon_after: beacon data to be used on the new channel
+ * @radar_required: whether radar detection is required on the new channel
+ * @block_tx: whether transmissions should be blocked while changing
+ * @count: number of beacons until switch
+ */
+struct cfg80211_csa_settings {
+        struct cfg80211_chan_def chandef;
+        struct cfg80211_beacon_data beacon_csa;
+        u16 counter_offset_beacon, counter_offset_presp;
+        struct cfg80211_beacon_data beacon_after;
+        bool radar_required;
+        bool block_tx;
+        u8 count;
+};
+
+/**
  * enum station_parameters_apply_mask - station parameter values to apply
  * @STATION_PARAM_APPLY_UAPSD: apply new uAPSD parameters (uapsd_queues, max_sp)
  * @STATION_PARAM_APPLY_CAPABILITY: apply new capability
@@ -2139,6 +2163,8 @@ struct cfg80211_update_ft_ies_params {
  * @crit_proto_stop: Indicates critical protocol no longer needs increased link
  *      reliability. This operation can not fail.
  * @set_coalesce: Set coalesce parameters.
+ *
+ * @channel_switch: initiate channel-switch procedure (with CSA)
  */
 struct cfg80211_ops {
         int     (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -2376,6 +2402,10 @@ struct cfg80211_ops {
                                    struct wireless_dev *wdev);
         int     (*set_coalesce)(struct wiphy *wiphy,
                                 struct cfg80211_coalesce *coalesce);
+
+        int     (*channel_switch)(struct wiphy *wiphy,
+                                  struct net_device *dev,
+                                  struct cfg80211_csa_settings *params);
 };
 
 /*
@@ -2441,6 +2471,8 @@ struct cfg80211_ops {
  * @WIPHY_FLAG_OFFCHAN_TX: Device supports direct off-channel TX.
  * @WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL: Device supports remain-on-channel call.
  * @WIPHY_FLAG_SUPPORTS_5_10_MHZ: Device supports 5 MHz and 10 MHz channels.
+ * @WIPHY_FLAG_HAS_CHANNEL_SWITCH: Device supports channel switch in
+ *      beaconing mode (AP, IBSS, Mesh, ...).
  */
 enum wiphy_flags {
         WIPHY_FLAG_CUSTOM_REGULATORY            = BIT(0),
@@ -2465,6 +2497,7 @@ enum wiphy_flags {
         WIPHY_FLAG_OFFCHAN_TX                   = BIT(20),
         WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL        = BIT(21),
         WIPHY_FLAG_SUPPORTS_5_10_MHZ            = BIT(22),
+        WIPHY_FLAG_HAS_CHANNEL_SWITCH           = BIT(23),
 };
 
 /**