cfg80211: Add local-state-change-only auth/deauth/disassoc

cfg80211 is quite strict on allowing authentication and association
commands only in certain states. In order to meet these requirements,
user space applications may need to clear authentication or
association state in some cases. Currently, this can be done with
deauth/disassoc command, but that ends up sending out Deauthentication
or Disassociation frame unnecessarily. Add a new nl80211 attribute to
allow this sending of the frame be skipped, but with all other
deauth/disassoc operations being completed.

Similar state change is also needed for IEEE 802.11r FT protocol in
the FT-over-DS case which does not use Authentication frame exchange
in a transition to another BSS. For this to work with cfg80211, an
authentication entry needs to be created for the target BSS without
sending out an Authentication frame. The nl80211 authentication
command can be used for this purpose, too, with the new attribute to
indicate that the command is only for changing local state. This
enables wpa_supplicant to complete FT-over-DS transition successfully.

Signed-off-by: Jouni Malinen <j@w1.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 9 insertions, 6 deletions

diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index 17fde0da1b08..17465777eb47 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -170,7 +170,7 @@ static int cfg80211_conn_do_work(struct wireless_dev *wdev)
                                             params->ssid, params->ssid_len,
                                             NULL, 0,
                                             params->key, params->key_len,
-                                            params->key_idx);
+                                            params->key_idx, false);
         case CFG80211_CONN_ASSOCIATE_NEXT:
                 BUG_ON(!rdev->ops->assoc);
                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
@@ -185,12 +185,13 @@ static int cfg80211_conn_do_work(struct wireless_dev *wdev)
                 if (err)
                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
                                                NULL, 0,
-                                               WLAN_REASON_DEAUTH_LEAVING);
+                                               WLAN_REASON_DEAUTH_LEAVING,
+                                               false);
                 return err;
         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
                                        NULL, 0,
-                                       WLAN_REASON_DEAUTH_LEAVING);
+                                       WLAN_REASON_DEAUTH_LEAVING, false);
                 /* return an error so that we call __cfg80211_connect_result() */
                 return -EINVAL;
         default:
@@ -675,7 +676,8 @@ void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
                                 continue;
                         bssid = wdev->auth_bsses[i]->pub.bssid;
                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
-                                                WLAN_REASON_DEAUTH_LEAVING);
+                                                WLAN_REASON_DEAUTH_LEAVING,
+                                                false);
                         WARN(ret, "deauth failed: %d\n", ret);
                 }
         }
@@ -934,7 +936,7 @@ int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
                 /* wdev->conn->params.bssid must be set if > SCANNING */
                 err = __cfg80211_mlme_deauth(rdev, dev,
                                              wdev->conn->params.bssid,
-                                             NULL, 0, reason);
+                                             NULL, 0, reason, false);
                 if (err)
                         return err;
         } else {
@@ -990,7 +992,8 @@ void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 
         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
-                                   NULL, 0, WLAN_REASON_DEAUTH_LEAVING)) {
+                                   NULL, 0, WLAN_REASON_DEAUTH_LEAVING,
+                                   false)) {
                 /* whatever -- assume gone anyway */
                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);