1 files changed, 139 insertions, 69 deletions

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index ef252eb..67059b8 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -248,11 +248,11 @@ void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 }
 
 
-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)
+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)
 {
 	int idx;
 	bool defunikey, defmultikey, defmgmtkey;
@@ -397,7 +397,41 @@ struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 	return key;
 }
 
-static void __ieee80211_key_destroy(struct ieee80211_key *key)
+static void ieee80211_key_free_common(struct ieee80211_key *key)
+{
+	if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)
+		ieee80211_aes_key_free(key->u.ccmp.tfm);
+	if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
+		ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
+	kfree(key);
+}
+
+static void __ieee80211_key_destroy(struct ieee80211_key *key,
+				    bool delay_tailroom)
+{
+	if (key->local)
+		ieee80211_key_disable_hw_accel(key);
+
+	if (key->local) {
+		struct ieee80211_sub_if_data *sdata = key->sdata;
+
+		ieee80211_debugfs_key_remove(key);
+
+		if (delay_tailroom) {
+			/* see ieee80211_delayed_tailroom_dec */
+			sdata->crypto_tx_tailroom_pending_dec++;
+			schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
+					      HZ/2);
+		} else {
+			sdata->crypto_tx_tailroom_needed_cnt--;
+		}
+	}
+
+	ieee80211_key_free_common(key);
+}
+
+static void ieee80211_key_destroy(struct ieee80211_key *key,
+				  bool delay_tailroom)
 {
 	if (!key)
 		return;
@@ -408,19 +442,13 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key)
 	 */
 	synchronize_net();
 
-	if (key->local)
-		ieee80211_key_disable_hw_accel(key);
-
-	if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)
-		ieee80211_aes_key_free(key->u.ccmp.tfm);
-	if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
-		ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
-	if (key->local) {
-		ieee80211_debugfs_key_remove(key);
-		key->sdata->crypto_tx_tailroom_needed_cnt--;
-	}
+	__ieee80211_key_destroy(key, delay_tailroom);
+}
 
-	kfree(key);
+void ieee80211_key_free_unused(struct ieee80211_key *key)
+{
+	WARN_ON(key->sdata || key->local);
+	ieee80211_key_free_common(key);
 }
 
 int ieee80211_key_link(struct ieee80211_key *key,
@@ -440,32 +468,6 @@ int ieee80211_key_link(struct ieee80211_key *key,
 	key->sdata = sdata;
 	key->sta = sta;
 
-	if (sta) {
-		/*
-		 * some hardware cannot handle TKIP with QoS, so
-		 * we indicate whether QoS could be in use.
-		 */
-		if (test_sta_flag(sta, WLAN_STA_WME))
-			key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
-	} else {
-		if (sdata->vif.type == NL80211_IFTYPE_STATION) {
-			struct sta_info *ap;
-
-			/*
-			 * We're getting a sta pointer in, so must be under
-			 * appropriate locking for sta_info_get().
-			 */
-
-			/* same here, the AP could be using QoS */
-			ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid);
-			if (ap) {
-				if (test_sta_flag(ap, WLAN_STA_WME))
-					key->conf.flags |=
-						IEEE80211_KEY_FLAG_WMM_STA;
-			}
-		}
-	}
-
 	mutex_lock(&sdata->local->key_mtx);
 
 	if (sta && pairwise)
@@ -477,19 +479,22 @@ int ieee80211_key_link(struct ieee80211_key *key,
 
 	increment_tailroom_need_count(sdata);
 
-	__ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
-	__ieee80211_key_destroy(old_key);
+	ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
+	ieee80211_key_destroy(old_key, true);
 
 	ieee80211_debugfs_key_add(key);
 
 	ret = ieee80211_key_enable_hw_accel(key);
 
+	if (ret)
+		ieee80211_key_free(key, true);
+
 	mutex_unlock(&sdata->local->key_mtx);
 
 	return ret;
 }
 
-void __ieee80211_key_free(struct ieee80211_key *key)
+void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 {
 	if (!key)
 		return;
@@ -498,18 +503,10 @@ void __ieee80211_key_free(struct ieee80211_key *key)
 	 * Replace key with nothingness if it was ever used.
 	 */
 	if (key->sdata)
-		__ieee80211_key_replace(key->sdata, key->sta,
+		ieee80211_key_replace(key->sdata, key->sta,
 				key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 				key, NULL);
-	__ieee80211_key_destroy(key);
-}
-
-void ieee80211_key_free(struct ieee80211_local *local,
-			struct ieee80211_key *key)
-{
-	mutex_lock(&local->key_mtx);
-	__ieee80211_key_free(key);
-	mutex_unlock(&local->key_mtx);
+	ieee80211_key_destroy(key, delay_tailroom);
 }
 
 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
@@ -566,36 +563,109 @@ void ieee80211_iter_keys(struct ieee80211_hw *hw,
 }
 EXPORT_SYMBOL(ieee80211_iter_keys);
 
-void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata)
+void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
 {
-	struct ieee80211_key *key;
+	struct ieee80211_key *key, *tmp;
+	LIST_HEAD(keys);
 
-	ASSERT_RTNL();
+	cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
 
 	mutex_lock(&sdata->local->key_mtx);
 
-	list_for_each_entry(key, &sdata->key_list, list)
-		ieee80211_key_disable_hw_accel(key);
+	sdata->crypto_tx_tailroom_needed_cnt -=
+		sdata->crypto_tx_tailroom_pending_dec;
+	sdata->crypto_tx_tailroom_pending_dec = 0;
+
+	ieee80211_debugfs_key_remove_mgmt_default(sdata);
+
+	list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
+		ieee80211_key_replace(key->sdata, key->sta,
+				key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
+				key, NULL);
+		list_add_tail(&key->list, &keys);
+	}
+
+	ieee80211_debugfs_key_update_default(sdata);
+
+	if (!list_empty(&keys)) {
+		synchronize_net();
+		list_for_each_entry_safe(key, tmp, &keys, list)
+			__ieee80211_key_destroy(key, false);
+	}
+
+	WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
+		     sdata->crypto_tx_tailroom_pending_dec);
 
 	mutex_unlock(&sdata->local->key_mtx);
 }
 
-void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
+void ieee80211_free_sta_keys(struct ieee80211_local *local,
+			     struct sta_info *sta)
 {
 	struct ieee80211_key *key, *tmp;
+	LIST_HEAD(keys);
+	int i;
 
-	mutex_lock(&sdata->local->key_mtx);
+	mutex_lock(&local->key_mtx);
+	for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
+		key = key_mtx_dereference(local, sta->gtk[i]);
+		if (!key)
+			continue;
+		ieee80211_key_replace(key->sdata, key->sta,
+				key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
+				key, NULL);
+		list_add(&key->list, &keys);
+	}
 
-	ieee80211_debugfs_key_remove_mgmt_default(sdata);
+	key = key_mtx_dereference(local, sta->ptk);
+	if (key) {
+		ieee80211_key_replace(key->sdata, key->sta,
+				key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
+				key, NULL);
+		list_add(&key->list, &keys);
+	}
 
-	list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
-		__ieee80211_key_free(key);
+	/*
+	 * NB: the station code relies on this being
+	 * done even if there aren't any keys
+	 */
+	synchronize_net();
 
-	ieee80211_debugfs_key_update_default(sdata);
+	list_for_each_entry_safe(key, tmp, &keys, list)
+		__ieee80211_key_destroy(key, true);
 
-	mutex_unlock(&sdata->local->key_mtx);
+	mutex_unlock(&local->key_mtx);
 }
 
+void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
+{
+	struct ieee80211_sub_if_data *sdata;
+
+	sdata = container_of(wk, struct ieee80211_sub_if_data,
+			     dec_tailroom_needed_wk.work);
+
+	/*
+	 * The reason for the delayed tailroom needed decrementing is to
+	 * make roaming faster: during roaming, all keys are first deleted
+	 * and then new keys are installed. The first new key causes the
+	 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
+	 * the cost of synchronize_net() (which can be slow). Avoid this
+	 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
+	 * key removal for a while, so if we roam the value is larger than
+	 * zero and no 0->1 transition happens.
+	 *
+	 * The cost is that if the AP switching was from an AP with keys
+	 * to one without, we still allocate tailroom while it would no
+	 * longer be needed. However, in the typical (fast) roaming case
+	 * within an ESS this usually won't happen.
+	 */
+
+	mutex_lock(&sdata->local->key_mtx);
+	sdata->crypto_tx_tailroom_needed_cnt -=
+		sdata->crypto_tx_tailroom_pending_dec;
+	sdata->crypto_tx_tailroom_pending_dec = 0;
+	mutex_unlock(&sdata->local->key_mtx);
+}
 
 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
 				const u8 *replay_ctr, gfp_t gfp)