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, 28 insertions, 11 deletions

diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 0855f0d3234..387dd2a27d2 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -377,7 +377,8 @@ int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
                          const u8 *bssid,
                          const u8 *ssid, int ssid_len,
                          const u8 *ie, int ie_len,
-                         const u8 *key, int key_len, int key_idx)
+                         const u8 *key, int key_len, int key_idx,
+                         bool local_state_change)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct cfg80211_auth_request req;
@@ -407,6 +408,7 @@ int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 
         memset(&req, 0, sizeof(req));
 
+        req.local_state_change = local_state_change;
         req.ie = ie;
         req.ie_len = ie_len;
         req.auth_type = auth_type;
@@ -433,12 +435,18 @@ int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
                 goto out;
         }
 
-        wdev->authtry_bsses[slot] = bss;
+        if (local_state_change)
+                wdev->auth_bsses[slot] = bss;
+        else
+                wdev->authtry_bsses[slot] = bss;
         cfg80211_hold_bss(bss);
 
         err = rdev->ops->auth(&rdev->wiphy, dev, &req);
         if (err) {
-                wdev->authtry_bsses[slot] = NULL;
+                if (local_state_change)
+                        wdev->auth_bsses[slot] = NULL;
+                else
+                        wdev->authtry_bsses[slot] = NULL;
                 cfg80211_unhold_bss(bss);
         }
 
@@ -453,14 +461,15 @@ int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
                        enum nl80211_auth_type auth_type, const u8 *bssid,
                        const u8 *ssid, int ssid_len,
                        const u8 *ie, int ie_len,
-                       const u8 *key, int key_len, int key_idx)
+                       const u8 *key, int key_len, int key_idx,
+                       bool local_state_change)
 {
         int err;
 
         wdev_lock(dev->ieee80211_ptr);
         err = __cfg80211_mlme_auth(rdev, dev, chan, auth_type, bssid,
                                    ssid, ssid_len, ie, ie_len,
-                                   key, key_len, key_idx);
+                                   key, key_len, key_idx, local_state_change);
         wdev_unlock(dev->ieee80211_ptr);
 
         return err;
@@ -554,7 +563,8 @@ int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 
 int __cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
                            struct net_device *dev, const u8 *bssid,
-                           const u8 *ie, int ie_len, u16 reason)
+                           const u8 *ie, int ie_len, u16 reason,
+                           bool local_state_change)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct cfg80211_deauth_request req;
@@ -564,6 +574,7 @@ int __cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 
         memset(&req, 0, sizeof(req));
         req.reason_code = reason;
+        req.local_state_change = local_state_change;
         req.ie = ie;
         req.ie_len = ie_len;
         if (wdev->current_bss &&
@@ -590,13 +601,15 @@ int __cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 
 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
                          struct net_device *dev, const u8 *bssid,
-                         const u8 *ie, int ie_len, u16 reason)
+                         const u8 *ie, int ie_len, u16 reason,
+                         bool local_state_change)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         int err;
 
         wdev_lock(wdev);
-        err = __cfg80211_mlme_deauth(rdev, dev, bssid, ie, ie_len, reason);
+        err = __cfg80211_mlme_deauth(rdev, dev, bssid, ie, ie_len, reason,
+                                     local_state_change);
         wdev_unlock(wdev);
 
         return err;
@@ -604,7 +617,8 @@ int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
 
 static int __cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
                                     struct net_device *dev, const u8 *bssid,
-                                    const u8 *ie, int ie_len, u16 reason)
+                                    const u8 *ie, int ie_len, u16 reason,
+                                    bool local_state_change)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct cfg80211_disassoc_request req;
@@ -619,6 +633,7 @@ static int __cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 
         memset(&req, 0, sizeof(req));
         req.reason_code = reason;
+        req.local_state_change = local_state_change;
         req.ie = ie;
         req.ie_len = ie_len;
         if (memcmp(wdev->current_bss->pub.bssid, bssid, ETH_ALEN) == 0)
@@ -631,13 +646,15 @@ static int __cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 
 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
                            struct net_device *dev, const u8 *bssid,
-                           const u8 *ie, int ie_len, u16 reason)
+                           const u8 *ie, int ie_len, u16 reason,
+                           bool local_state_change)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         int err;
 
         wdev_lock(wdev);
-        err = __cfg80211_mlme_disassoc(rdev, dev, bssid, ie, ie_len, reason);
+        err = __cfg80211_mlme_disassoc(rdev, dev, bssid, ie, ie_len, reason,
+                                       local_state_change);
         wdev_unlock(wdev);
 
         return err;