cfg80211: allow the user space to change current NAN configuration

Some NAN configuration paramaters may change during the operation of
the NAN device. For example, a user may want to update master preference
value when the device gets plugged/unplugged to the power.
Add API that allows to do so.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 28 insertions, 2 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 2f35ccf6da83..8574a57e19ba 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2327,6 +2327,18 @@ struct cfg80211_nan_conf {
 };
 
 /**
+ * enum cfg80211_nan_conf_changes - indicates changed fields in NAN
+ * configuration
+ *
+ * @CFG80211_NAN_CONF_CHANGED_PREF: master preference
+ * @CFG80211_NAN_CONF_CHANGED_DUAL: dual band operation
+ */
+enum cfg80211_nan_conf_changes {
+        CFG80211_NAN_CONF_CHANGED_PREF = BIT(0),
+        CFG80211_NAN_CONF_CHANGED_DUAL = BIT(1),
+};
+
+/**
  * struct cfg80211_nan_func_filter - a NAN function Rx / Tx filter
  *
  * @filter: the content of the filter
@@ -2691,6 +2703,9 @@ struct cfg80211_nan_func {
  *      On success the driver should assign an instance_id in the
  *      provided @nan_func.
  * @del_nan_func: Delete a NAN function.
+ * @nan_change_conf: changes NAN configuration. The changed parameters must
+ *      be specified in @changes (using &enum cfg80211_nan_conf_changes);
+ *      All other parameters must be ignored.
  */
 struct cfg80211_ops {
         int     (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -2963,6 +2978,10 @@ struct cfg80211_ops {
                                 struct cfg80211_nan_func *nan_func);
         void    (*del_nan_func)(struct wiphy *wiphy, struct wireless_dev *wdev,
                                u64 cookie);
+        int     (*nan_change_conf)(struct wiphy *wiphy,
+                                   struct wireless_dev *wdev,
+                                   struct cfg80211_nan_conf *conf,
+                                   u32 changes);
 };
 
 /*
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index e4935d963061..9c9c0c352873 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -862,6 +862,10 @@
  *      the response to this command.
  *      Look at %NL80211_ATTR_SOCKET_OWNER as well.
  * @NL80211_CMD_DEL_NAN_FUNCTION: Delete a NAN function by cookie.
+ * @NL80211_CMD_CHANGE_NAN_CONFIG: Change current NAN configuration. NAN
+ *      must be operational (%NL80211_CMD_START_NAN was executed).
+ *      It must contain at least one of the following attributes:
+ *      %NL80211_ATTR_NAN_MASTER_PREF, %NL80211_ATTR_NAN_DUAL.
  *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
@@ -1055,6 +1059,7 @@ enum nl80211_commands {
         NL80211_CMD_STOP_NAN,
         NL80211_CMD_ADD_NAN_FUNCTION,
         NL80211_CMD_DEL_NAN_FUNCTION,
+        NL80211_CMD_CHANGE_NAN_CONFIG,
 
         /* add new commands above here */
 
@@ -1910,12 +1915,14 @@ enum nl80211_commands {
  *      used to pull the stored data for mesh peer in power save state.
  *
  * @NL80211_ATTR_NAN_MASTER_PREF: the master preference to be used by
- *      %NL80211_CMD_START_NAN. Its type is u8 and it can't be 0.
+ *      %NL80211_CMD_START_NAN and optionally with
+ *      %NL80211_CMD_CHANGE_NAN_CONFIG. Its type is u8 and it can't be 0.
  *      Also, values 1 and 255 are reserved for certification purposes and
  *      should not be used during a normal device operation.
  * @NL80211_ATTR_NAN_DUAL: NAN dual band operation config (see
  *      &enum nl80211_nan_dual_band_conf). This attribute is used with
- *      %NL80211_CMD_START_NAN.
+ *      %NL80211_CMD_START_NAN and optionally with
+ *      %NL80211_CMD_CHANGE_NAN_CONFIG.
  * @NL80211_ATTR_NAN_FUNC: a function that can be added to NAN. See
  *      &enum nl80211_nan_func_attributes for description of this nested
  *      attribute.