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>

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 4584162..7df9b50 100644 (file)
--- 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 1a3fe9a..80051ff 100644 (file)
--- 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

diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 8fd0242..3df195a 100644 (file)
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -612,6 +612,17 @@ void cfg80211_del_sta(struct net_device *dev, const u8 *mac_addr, gfp_t gfp)
 }
 EXPORT_SYMBOL(cfg80211_del_sta);
 
+void cfg80211_conn_failed(struct net_device *dev, const u8 *mac_addr,
+                         enum nl80211_connect_failed_reason reason,
+                         gfp_t gfp)
+{
+       struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
+       struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+
+       nl80211_send_conn_failed_event(rdev, dev, mac_addr, reason, gfp);
+}
+EXPORT_SYMBOL(cfg80211_conn_failed);
+
 struct cfg80211_mgmt_registration {
        struct list_head list;
 

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 222189b..f1047ae 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -8364,6 +8364,40 @@ void nl80211_send_sta_del_event(struct cfg80211_registered_device *rdev,
        nlmsg_free(msg);
 }
 
+void nl80211_send_conn_failed_event(struct cfg80211_registered_device *rdev,
+                                   struct net_device *dev, const u8 *mac_addr,
+                                   enum nl80211_connect_failed_reason reason,
+                                   gfp_t gfp)
+{
+       struct sk_buff *msg;
+       void *hdr;
+
+       msg = nlmsg_new(NLMSG_GOODSIZE, gfp);
+       if (!msg)
+               return;
+
+       hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_CONN_FAILED);
+       if (!hdr) {
+               nlmsg_free(msg);
+               return;
+       }
+
+       if (nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex) ||
+           nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr) ||
+           nla_put_u32(msg, NL80211_ATTR_CONN_FAILED_REASON, reason))
+               goto nla_put_failure;
+
+       genlmsg_end(msg, hdr);
+
+       genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
+                               nl80211_mlme_mcgrp.id, gfp);
+       return;
+
+ nla_put_failure:
+       genlmsg_cancel(msg, hdr);
+       nlmsg_free(msg);
+}
+
 static bool __nl80211_unexpected_frame(struct net_device *dev, u8 cmd,
                                       const u8 *addr, gfp_t gfp)
 {

diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index 9f2616f..f615351 100644 (file)
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -91,6 +91,11 @@ void nl80211_send_sta_del_event(struct cfg80211_registered_device *rdev,
                                struct net_device *dev, const u8 *mac_addr,
                                gfp_t gfp);
 
+void nl80211_send_conn_failed_event(struct cfg80211_registered_device *rdev,
+                                   struct net_device *dev, const u8 *mac_addr,
+                                   enum nl80211_connect_failed_reason reason,
+                                   gfp_t gfp);
+
 int nl80211_send_mgmt(struct cfg80211_registered_device *rdev,
                      struct wireless_dev *wdev, u32 nlpid,
                      int freq, int sig_dbm,