cfg80211: re-join IBSS when privacy changes
When going from/to a WEP protected IBSS, we need to
leave this one and join a new one to take care of
the changed capability.
Cc: Hong Zhang <henryzhang62@yahoo.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index 41abcbd..29091ac 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -437,6 +437,7 @@
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
int err, i;
+ bool rejoin = false;
if (!wdev->wext.keys) {
wdev->wext.keys = kzalloc(sizeof(*wdev->wext.keys),
@@ -466,8 +467,24 @@
if (remove) {
err = 0;
- if (wdev->current_bss)
+ if (wdev->current_bss) {
+ /*
+ * If removing the current TX key, we will need to
+ * join a new IBSS without the privacy bit clear.
+ */
+ if (idx == wdev->wext.default_key &&
+ wdev->iftype == NL80211_IFTYPE_ADHOC) {
+ __cfg80211_leave_ibss(rdev, wdev->netdev, true);
+ rejoin = true;
+ }
err = rdev->ops->del_key(&rdev->wiphy, dev, idx, addr);
+ }
+ /*
+ * Applications using wireless extensions expect to be
+ * able to delete keys that don't exist, so allow that.
+ */
+ if (err == -ENOENT)
+ err = 0;
if (!err) {
if (!addr) {
wdev->wext.keys->params[idx].key_len = 0;
@@ -478,12 +495,9 @@
else if (idx == wdev->wext.default_mgmt_key)
wdev->wext.default_mgmt_key = -1;
}
- /*
- * Applications using wireless extensions expect to be
- * able to delete keys that don't exist, so allow that.
- */
- if (err == -ENOENT)
- return 0;
+
+ if (!err && rejoin)
+ err = cfg80211_ibss_wext_join(rdev, wdev);
return err;
}
@@ -511,11 +525,25 @@
if ((params->cipher == WLAN_CIPHER_SUITE_WEP40 ||
params->cipher == WLAN_CIPHER_SUITE_WEP104) &&
(tx_key || (!addr && wdev->wext.default_key == -1))) {
- if (wdev->current_bss)
+ if (wdev->current_bss) {
+ /*
+ * If we are getting a new TX key from not having
+ * had one before we need to join a new IBSS with
+ * the privacy bit set.
+ */
+ if (wdev->iftype == NL80211_IFTYPE_ADHOC &&
+ wdev->wext.default_key == -1) {
+ __cfg80211_leave_ibss(rdev, wdev->netdev, true);
+ rejoin = true;
+ }
err = rdev->ops->set_default_key(&rdev->wiphy,
dev, idx);
- if (!err)
+ }
+ if (!err) {
wdev->wext.default_key = idx;
+ if (rejoin)
+ err = cfg80211_ibss_wext_join(rdev, wdev);
+ }
return err;
}
@@ -539,10 +567,13 @@
{
int err;
+ /* devlist mutex needed for possible IBSS re-join */
+ mutex_lock(&rdev->devlist_mtx);
wdev_lock(dev->ieee80211_ptr);
err = __cfg80211_set_encryption(rdev, dev, addr, remove,
tx_key, idx, params);
wdev_unlock(dev->ieee80211_ptr);
+ mutex_unlock(&rdev->devlist_mtx);
return err;
}