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mac80211: free all AP/VLAN keys at once

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When the AP interface is stopped, free all AP and VLAN keys at
once to only require synchronize_net() once. Since that does
synchronize_net(), also move two such calls into the function
(using the new force_synchronize parameter) to avoid doing it
twice.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2013-12-04 23:47:09 +01:00
parent e716251d77
commit 7907c7d33c
4 changed files with 43 additions and 28 deletions
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5
net/mac80211/cfg.c
View file

@ -1098,10 +1098,7 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
kfree_rcu(old_probe_resp, rcu_head);
__sta_info_flush(sdata, true);
synchronize_net();
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
ieee80211_free_keys(vlan);
ieee80211_free_keys(sdata);
ieee80211_free_keys(sdata, true);
sdata->vif.bss_conf.enable_beacon = false;
sdata->vif.bss_conf.ssid_len = 0;

19
net/mac80211/iface.c
View file

@ -889,18 +889,15 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
cancel_work_sync(&sdata->work);
/*
* When we get here, the interface is marked down.
* Free the remaining keys, if there are any
* (shouldn't be, except maybe in WDS mode?)
*
* We need synchronize_rcu() to wait for the RX path in
* case it is using the interface and enqueuing frames
* at this very time on another CPU.
* Force the key freeing to always synchronize_net()
* to wait for the RX path in case it is using this
* interface enqueuing frames * at this very time on
* another CPU.
*/
synchronize_rcu();
/*
* Free all remaining keys, there shouldn't be any,
* except maybe in WDS mode?
*/
ieee80211_free_keys(sdata);
ieee80211_free_keys(sdata, true);
/* fall through */
case NL80211_IFTYPE_AP:
@ -1026,7 +1023,7 @@ static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
int i;
/* free extra data */
ieee80211_free_keys(sdata);
ieee80211_free_keys(sdata, false);
ieee80211_debugfs_remove_netdev(sdata);

44
net/mac80211/key.c
View file

@ -589,14 +589,10 @@ void ieee80211_iter_keys(struct ieee80211_hw *hw,
}
EXPORT_SYMBOL(ieee80211_iter_keys);
void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
struct list_head *keys)
{
struct ieee80211_key *key, *tmp;
LIST_HEAD(keys);
cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
mutex_lock(&sdata->local->key_mtx);
sdata->crypto_tx_tailroom_needed_cnt -=
sdata->crypto_tx_tailroom_pending_dec;
@ -608,21 +604,45 @@ void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
ieee80211_key_replace(key->sdata, key->sta,
key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
key, NULL);
list_add_tail(&key->list, &keys);
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);
void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
bool force_synchronize)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *vlan;
struct ieee80211_key *key, *tmp;
LIST_HEAD(keys);
cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
mutex_lock(&local->key_mtx);
ieee80211_free_keys_iface(sdata, &keys);
if (sdata->vif.type == NL80211_IFTYPE_AP) {
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
ieee80211_free_keys_iface(vlan, &keys);
}
if (!list_empty(&keys) || force_synchronize)
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);
if (sdata->vif.type == NL80211_IFTYPE_AP) {
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
vlan->crypto_tx_tailroom_pending_dec);
}
mutex_unlock(&sdata->local->key_mtx);
mutex_unlock(&local->key_mtx);
}
void ieee80211_free_sta_keys(struct ieee80211_local *local,

3
net/mac80211/key.h
View file

@ -136,7 +136,8 @@ void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
bool uni, bool multi);
void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
int idx);
void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
bool force_synchronize);
void ieee80211_free_sta_keys(struct ieee80211_local *local,
struct sta_info *sta);
void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);