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authorJavier Cardona <javier@cozybit.com>2008-09-11 15:32:50 -0700
committerJohn W. Linville <linville@tuxdriver.com>2008-09-15 16:48:25 -0400
commit9c31fd635ddfae6eb61712491770befa2ce1fdde (patch)
tree9321ed2597668e02093798e635c4613891f94fcf /drivers/net
parentbed7aac9416f50425d2200df32bcc9bf248ff8cb (diff)
libertas: Reduce the WPA key installation time.
WPA requires that the PTK is installed immediately after the 4-way handshake in order to properly decrypt the subsequent incoming EAPOL-GTK frame. If the PTK is not enabled by the time the EAPOL-GTK frame arrives, the frame is dropped and the supplicant does not receive the group key. This will happen with fast Access Points that send the EAPOL-GTK frame before the suplicant has successfully installed and enabled the PTK. To mitigate this situation, this patch simplifies and accelerates the SIOCSIWENCODEEXT execution. This patch resolves OLPC ticket 7825 (http://dev.laptop.org/ticket/7825) Signed-off-by: Javier Cardona <javier@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/wireless/libertas/wext.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/net/wireless/libertas/wext.c b/drivers/net/wireless/libertas/wext.c
index d86fcf0a5ad..1156be53df3 100644
--- a/drivers/net/wireless/libertas/wext.c
+++ b/drivers/net/wireless/libertas/wext.c
@@ -30,6 +30,14 @@ static inline void lbs_postpone_association_work(struct lbs_private *priv)
queue_delayed_work(priv->work_thread, &priv->assoc_work, HZ / 2);
}
+static inline void lbs_do_association_work(struct lbs_private *priv)
+{
+ if (priv->surpriseremoved)
+ return;
+ cancel_delayed_work(&priv->assoc_work);
+ queue_delayed_work(priv->work_thread, &priv->assoc_work, 0);
+}
+
static inline void lbs_cancel_association_work(struct lbs_private *priv)
{
cancel_delayed_work(&priv->assoc_work);
@@ -1585,12 +1593,14 @@ static int lbs_set_encodeext(struct net_device *dev,
set_bit(ASSOC_FLAG_SECINFO, &assoc_req->flags);
}
- disable_wep (assoc_req);
+ /* Only disable wep if necessary: can't waste time here. */
+ if (priv->mac_control & CMD_ACT_MAC_WEP_ENABLE)
+ disable_wep(assoc_req);
}
out:
- if (ret == 0) {
- lbs_postpone_association_work(priv);
+ if (ret == 0) { /* key installation is time critical: postpone not! */
+ lbs_do_association_work(priv);
} else {
lbs_cancel_association_work(priv);
}