cfg80211/nl80211: Notify connection request failure in AP mode

In AP mode, when a station requests connection to an AP and if the
request is failed for particular reason, userspace is notified about the
failure through NL80211_CMD_CONN_FAILED command. Reason for the failure
is sent through the attribute NL80211_ATTR_CONN_FAILED_REASON.

Signed-off-by: Pandiyarajan Pitchaimuthu <c_ppitch@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 43 insertions, 0 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 458416279347..7df9b500c804 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -573,6 +573,11 @@
  * @NL80211_CMD_STOP_P2P_DEVICE: Stop the given P2P Device, identified by
  *      its %NL80211_ATTR_WDEV identifier.
  *
+ * @NL80211_CMD_CONN_FAILED: connection request to an AP failed; used to
+ *      notify userspace that AP has rejected the connection request from a
+ *      station, due to particular reason. %NL80211_ATTR_CONN_FAILED_REASON
+ *      is used for this.
+ *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
  */
@@ -719,6 +724,8 @@ enum nl80211_commands {
         NL80211_CMD_START_P2P_DEVICE,
         NL80211_CMD_STOP_P2P_DEVICE,
 
+        NL80211_CMD_CONN_FAILED,
+
         /* add new commands above here */
 
         /* used to define NL80211_CMD_MAX below */
@@ -1262,6 +1269,10 @@ enum nl80211_commands {
  *      was used to provide the hint. For the different types of
  *      allowed user regulatory hints see nl80211_user_reg_hint_type.
  *
+ * @NL80211_ATTR_CONN_FAILED_REASON: The reason for which AP has rejected
+ *      the connection request from a station. nl80211_connect_failed_reason
+ *      enum has different reasons of connection failure.
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -1517,6 +1528,8 @@ enum nl80211_attrs {
 
         NL80211_ATTR_USER_REG_HINT_TYPE,
 
+        NL80211_ATTR_CONN_FAILED_REASON,
+
         /* add attributes here, update the policy in nl80211.c */
 
         __NL80211_ATTR_AFTER_LAST,
@@ -3045,4 +3058,15 @@ enum nl80211_probe_resp_offload_support_attr {
         NL80211_PROBE_RESP_OFFLOAD_SUPPORT_80211U =     1<<3,
 };
 
+/**
+ * enum nl80211_connect_failed_reason - connection request failed reasons
+ * @NL80211_CONN_FAIL_MAX_CLIENTS: Maximum number of clients that can be
+ *      handled by the AP is reached.
+ * @NL80211_CONN_FAIL_BLOCKED_CLIENT: Client's MAC is in the AP's blocklist.
+ */
+enum nl80211_connect_failed_reason {
+        NL80211_CONN_FAIL_MAX_CLIENTS,
+        NL80211_CONN_FAIL_BLOCKED_CLIENT,
+};
+
 #endif /* __LINUX_NL80211_H */
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 1a3fe9ae4c49..80051ffc2755 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3361,6 +3361,25 @@ void cfg80211_new_sta(struct net_device *dev, const u8 *mac_addr,
 void cfg80211_del_sta(struct net_device *dev, const u8 *mac_addr, gfp_t gfp);
 
 /**
+ * cfg80211_conn_failed - connection request failed notification
+ *
+ * @dev: the netdev
+ * @mac_addr: the station's address
+ * @reason: the reason for connection failure
+ * @gfp: allocation flags
+ *
+ * Whenever a station tries to connect to an AP and if the station
+ * could not connect to the AP as the AP has rejected the connection
+ * for some reasons, this function is called.
+ *
+ * The reason for connection failure can be any of the value from
+ * nl80211_connect_failed_reason enum
+ */
+void cfg80211_conn_failed(struct net_device *dev, const u8 *mac_addr,
+                          enum nl80211_connect_failed_reason reason,
+                          gfp_t gfp);
+
+/**
  * cfg80211_rx_mgmt - notification of received, unprocessed management frame
  * @wdev: wireless device receiving the frame
  * @freq: Frequency on which the frame was received in MHz