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, 30 insertions, 0 deletions

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index eb68735b3318..1f42bc3dcb9c 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -676,6 +676,16 @@
  * @NL80211_CMD_GET_COALESCE: Get currently supported coalesce rules.
  * @NL80211_CMD_SET_COALESCE: Configure coalesce rules or clear existing rules.
  *
+ * @NL80211_CMD_CHANNEL_SWITCH: Perform a channel switch by announcing the
+ *      the new channel information (Channel Switch Announcement - CSA)
+ *      in the beacon for some time (as defined in the
+ *      %NL80211_ATTR_CH_SWITCH_COUNT parameter) and then change to the
+ *      new channel. Userspace provides the new channel information (using
+ *      %NL80211_ATTR_WIPHY_FREQ and the attributes determining channel
+ *      width). %NL80211_ATTR_CH_SWITCH_BLOCK_TX may be supplied to inform
+ *      other station that transmission must be blocked until the channel
+ *      switch is complete.
+ *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
  */
@@ -841,6 +851,8 @@ enum nl80211_commands {
         NL80211_CMD_GET_COALESCE,
         NL80211_CMD_SET_COALESCE,
 
+        NL80211_CMD_CHANNEL_SWITCH,
+
         /* add new commands above here */
 
         /* used to define NL80211_CMD_MAX below */
@@ -1469,6 +1481,18 @@ enum nl80211_commands {
  *
  * @NL80211_ATTR_COALESCE_RULE: Coalesce rule information.
  *
+ * @NL80211_ATTR_CH_SWITCH_COUNT: u32 attribute specifying the number of TBTT's
+ *      until the channel switch event.
+ * @NL80211_ATTR_CH_SWITCH_BLOCK_TX: flag attribute specifying that transmission
+ *      must be blocked on the current channel (before the channel switch
+ *      operation).
+ * @NL80211_ATTR_CSA_IES: Nested set of attributes containing the IE information
+ *      for the time while performing a channel switch.
+ * @NL80211_ATTR_CSA_C_OFF_BEACON: Offset of the channel switch counter
+ *      field in the beacons tail (%NL80211_ATTR_BEACON_TAIL).
+ * @NL80211_ATTR_CSA_C_OFF_PRESP: Offset of the channel switch counter
+ *      field in the probe response (%NL80211_ATTR_PROBE_RESP).
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -1771,6 +1795,12 @@ enum nl80211_attrs {
 
         NL80211_ATTR_COALESCE_RULE,
 
+        NL80211_ATTR_CH_SWITCH_COUNT,
+        NL80211_ATTR_CH_SWITCH_BLOCK_TX,
+        NL80211_ATTR_CSA_IES,
+        NL80211_ATTR_CSA_C_OFF_BEACON,
+        NL80211_ATTR_CSA_C_OFF_PRESP,
+
         /* add attributes here, update the policy in nl80211.c */
 
         __NL80211_ATTR_AFTER_LAST,