cfg80211/mac80211: allow per-station GTKs
This adds API to allow adding per-station GTKs,
updates mac80211 to support it, and also allows
drivers to remove a key from hwaccel again when
this may be necessary due to multiple GTKs.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 6a63d1a..ccd676b 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -68,15 +68,21 @@
might_sleep();
- if (!key->local->ops->set_key) {
- ret = -EOPNOTSUPP;
+ if (!key->local->ops->set_key)
goto out_unsupported;
- }
assert_key_lock(key->local);
sta = get_sta_for_key(key);
+ /*
+ * If this is a per-STA GTK, check if it
+ * is supported; if not, return.
+ */
+ if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
+ !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK))
+ goto out_unsupported;
+
sdata = key->sdata;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
sdata = container_of(sdata->bss,
@@ -85,31 +91,28 @@
ret = drv_set_key(key->local, SET_KEY, sdata, sta, &key->conf);
- if (!ret)
+ if (!ret) {
key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
+ return 0;
+ }
- if (ret && ret != -ENOSPC && ret != -EOPNOTSUPP)
+ if (ret != -ENOSPC && ret != -EOPNOTSUPP)
wiphy_err(key->local->hw.wiphy,
"failed to set key (%d, %pM) to hardware (%d)\n",
key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
-out_unsupported:
- if (ret) {
- switch (key->conf.cipher) {
- case WLAN_CIPHER_SUITE_WEP40:
- case WLAN_CIPHER_SUITE_WEP104:
- case WLAN_CIPHER_SUITE_TKIP:
- case WLAN_CIPHER_SUITE_CCMP:
- case WLAN_CIPHER_SUITE_AES_CMAC:
- /* all of these we can do in software */
- ret = 0;
- break;
- default:
- ret = -EINVAL;
- }
+ out_unsupported:
+ switch (key->conf.cipher) {
+ case WLAN_CIPHER_SUITE_WEP40:
+ case WLAN_CIPHER_SUITE_WEP104:
+ case WLAN_CIPHER_SUITE_TKIP:
+ case WLAN_CIPHER_SUITE_CCMP:
+ case WLAN_CIPHER_SUITE_AES_CMAC:
+ /* all of these we can do in software */
+ return 0;
+ default:
+ return -EINVAL;
}
-
- return ret;
}
static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
@@ -147,6 +150,26 @@
key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
}
+void ieee80211_key_removed(struct ieee80211_key_conf *key_conf)
+{
+ struct ieee80211_key *key;
+
+ key = container_of(key_conf, struct ieee80211_key, conf);
+
+ might_sleep();
+ assert_key_lock(key->local);
+
+ key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
+
+ /*
+ * Flush TX path to avoid attempts to use this key
+ * after this function returns. Until then, drivers
+ * must be prepared to handle the key.
+ */
+ synchronize_rcu();
+}
+EXPORT_SYMBOL_GPL(ieee80211_key_removed);
+
static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
int idx)
{
@@ -202,6 +225,7 @@
static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta,
+ bool pairwise,
struct ieee80211_key *old,
struct ieee80211_key *new)
{
@@ -210,8 +234,14 @@
if (new)
list_add(&new->list, &sdata->key_list);
- if (sta) {
- rcu_assign_pointer(sta->key, new);
+ if (sta && pairwise) {
+ rcu_assign_pointer(sta->ptk, new);
+ } else if (sta) {
+ if (old)
+ idx = old->conf.keyidx;
+ else
+ idx = new->conf.keyidx;
+ rcu_assign_pointer(sta->gtk[idx], new);
} else {
WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
@@ -355,6 +385,7 @@
{
struct ieee80211_key *old_key;
int idx, ret;
+ bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
BUG_ON(!sdata);
BUG_ON(!key);
@@ -371,13 +402,6 @@
*/
if (test_sta_flags(sta, WLAN_STA_WME))
key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
-
- /*
- * This key is for a specific sta interface,
- * inform the driver that it should try to store
- * this key as pairwise key.
- */
- key->conf.flags |= IEEE80211_KEY_FLAG_PAIRWISE;
} else {
if (sdata->vif.type == NL80211_IFTYPE_STATION) {
struct sta_info *ap;
@@ -399,12 +423,14 @@
mutex_lock(&sdata->local->key_mtx);
- if (sta)
- old_key = sta->key;
+ if (sta && pairwise)
+ old_key = sta->ptk;
+ else if (sta)
+ old_key = sta->gtk[idx];
else
old_key = sdata->keys[idx];
- __ieee80211_key_replace(sdata, sta, old_key, key);
+ __ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
__ieee80211_key_destroy(old_key);
ieee80211_debugfs_key_add(key);
@@ -423,7 +449,8 @@
*/
if (key->sdata)
__ieee80211_key_replace(key->sdata, key->sta,
- key, NULL);
+ key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
+ key, NULL);
__ieee80211_key_destroy(key);
}