#include <linux/etherdevice.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
+#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "debugfs_key.h"
#include "aes_ccm.h"
-/*
- * Key handling basics
+/**
+ * DOC: Key handling basics
*
* Key handling in mac80211 is done based on per-interface (sub_if_data)
* keys and per-station keys. Since each station belongs to an interface,
*
* All operations here are called under RTNL so no extra locking is
* required.
+ *
+ * NOTE: This code requires that sta info *destruction* is done under
+ * RTNL, otherwise it can try to access already freed STA structs
+ * when a STA key is being freed.
*/
static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
* address to indicate a transmit-only key.
*/
if (key->conf.alg != ALG_WEP &&
- (key->sdata->type == IEEE80211_IF_TYPE_AP ||
- key->sdata->type == IEEE80211_IF_TYPE_VLAN))
+ (key->sdata->vif.type == IEEE80211_IF_TYPE_AP ||
+ key->sdata->vif.type == IEEE80211_IF_TYPE_VLAN))
addr = zero_addr;
if (key->sta)
if (!key->local->ops->set_key)
return;
+ /*
+ * This makes sure that all pending flushes have
+ * actually completed prior to uploading new key
+ * material to the hardware. That is necessary to
+ * avoid races between flushing STAs and adding
+ * new keys for them.
+ */
+ __ieee80211_run_pending_flush(key->local);
+
addr = get_mac_for_key(key);
ret = key->local->ops->set_key(local_to_hw(key->local), SET_KEY,
key->conf.keyidx, print_mac(mac, addr), ret);
}
+static void ieee80211_key_mark_hw_accel_off(struct ieee80211_key *key)
+{
+ if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
+ key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
+ key->flags |= KEY_FLAG_REMOVE_FROM_HARDWARE;
+ }
+}
+
static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
{
const u8 *addr;
int ret;
DECLARE_MAC_BUF(mac);
- if (!key->local->ops->set_key)
+ if (!key || !key->local->ops->set_key)
return;
- if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
+ if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
+ !(key->flags & KEY_FLAG_REMOVE_FROM_HARDWARE))
return;
addr = get_mac_for_key(key);
wiphy_name(key->local->hw.wiphy),
key->conf.keyidx, print_mac(mac, addr), ret);
- key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
+ key->flags &= ~(KEY_FLAG_UPLOADED_TO_HARDWARE |
+ KEY_FLAG_REMOVE_FROM_HARDWARE);
}
-struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata,
- struct sta_info *sta,
- enum ieee80211_key_alg alg,
+struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
int idx,
size_t key_len,
const u8 *key_data)
key->conf.keyidx = idx;
key->conf.keylen = key_len;
memcpy(key->conf.key, key_data, key_len);
-
- key->local = sdata->local;
- key->sdata = sdata;
- key->sta = sta;
+ INIT_LIST_HEAD(&key->list);
if (alg == ALG_CCMP) {
/*
}
}
- ieee80211_debugfs_key_add(key->local, key);
+ return key;
+}
- /* remove key first */
- if (sta)
- ieee80211_key_free(sta->key);
- else
- ieee80211_key_free(sdata->keys[idx]);
+static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta,
+ struct ieee80211_key *key,
+ struct ieee80211_key *new)
+{
+ int idx, defkey;
+
+ if (new)
+ list_add(&new->list, &sdata->key_list);
+
+ if (sta) {
+ rcu_assign_pointer(sta->key, new);
+ } else {
+ WARN_ON(new && key && new->conf.keyidx != key->conf.keyidx);
+
+ if (key)
+ idx = key->conf.keyidx;
+ else
+ idx = new->conf.keyidx;
+
+ defkey = key && sdata->default_key == key;
+
+ if (defkey && !new)
+ ieee80211_set_default_key(sdata, -1);
+
+ rcu_assign_pointer(sdata->keys[idx], new);
+ if (defkey && new)
+ ieee80211_set_default_key(sdata, new->conf.keyidx);
+ }
+
+ if (key) {
+ ieee80211_key_mark_hw_accel_off(key);
+ /*
+ * We'll use an empty list to indicate that the key
+ * has already been removed.
+ */
+ list_del_init(&key->list);
+ }
+}
+
+void ieee80211_key_link(struct ieee80211_key *key,
+ struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta)
+{
+ struct ieee80211_key *old_key;
+ int idx;
+
+ ASSERT_RTNL();
+ might_sleep();
+
+ BUG_ON(!sdata);
+ BUG_ON(!key);
+
+ idx = key->conf.keyidx;
+ key->local = sdata->local;
+ key->sdata = sdata;
+ key->sta = sta;
+
+ ieee80211_debugfs_key_add(key->local, key);
if (sta) {
ieee80211_debugfs_key_sta_link(key, sta);
if (sta->flags & WLAN_STA_WME)
key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
} else {
- if (sdata->type == IEEE80211_IF_TYPE_STA) {
+ if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
struct sta_info *ap;
+ rcu_read_lock();
+
/* same here, the AP could be using QoS */
ap = sta_info_get(key->local, key->sdata->u.sta.bssid);
if (ap) {
if (ap->flags & WLAN_STA_WME)
key->conf.flags |=
IEEE80211_KEY_FLAG_WMM_STA;
- sta_info_put(ap);
}
+
+ rcu_read_unlock();
}
}
- /* enable hwaccel if appropriate */
- if (netif_running(key->sdata->dev))
- ieee80211_key_enable_hw_accel(key);
-
if (sta)
- rcu_assign_pointer(sta->key, key);
+ old_key = sta->key;
else
- rcu_assign_pointer(sdata->keys[idx], key);
+ old_key = sdata->keys[idx];
- list_add(&key->list, &sdata->key_list);
+ __ieee80211_key_replace(sdata, sta, old_key, key);
- return key;
+ if (old_key) {
+ synchronize_rcu();
+ ieee80211_key_free(old_key);
+ }
+
+ if (netif_running(sdata->dev))
+ ieee80211_key_enable_hw_accel(key);
}
void ieee80211_key_free(struct ieee80211_key *key)
{
+ ASSERT_RTNL();
+ might_sleep();
+
if (!key)
return;
- if (key->sta) {
- rcu_assign_pointer(key->sta->key, NULL);
- } else {
- if (key->sdata->default_key == key)
- ieee80211_set_default_key(key->sdata, -1);
- if (key->conf.keyidx >= 0 &&
- key->conf.keyidx < NUM_DEFAULT_KEYS)
- rcu_assign_pointer(key->sdata->keys[key->conf.keyidx],
- NULL);
- else
- WARN_ON(1);
- }
+ if (key->sdata) {
+ /*
+ * Replace key with nothingness.
+ *
+ * Because other code may have key reference (RCU protected)
+ * right now, we then wait for a grace period before freeing
+ * it.
+ * An empty list indicates it was never added to the key list
+ * or has been removed already. It may, however, still be in
+ * hardware for acceleration.
+ */
+ if (!list_empty(&key->list))
+ __ieee80211_key_replace(key->sdata, key->sta,
+ key, NULL);
- /* wait for all key users to complete */
- synchronize_rcu();
+ /*
+ * Do NOT remove this without looking at sta_info_destroy()
+ */
+ synchronize_rcu();
- /* remove from hwaccel if appropriate */
- ieee80211_key_disable_hw_accel(key);
+ /*
+ * Remove from hwaccel if appropriate, this will
+ * only happen when the key is actually unlinked,
+ * it will already be done when the key was replaced.
+ */
+ ieee80211_key_disable_hw_accel(key);
+ }
if (key->conf.alg == ALG_CCMP)
ieee80211_aes_key_free(key->u.ccmp.tfm);
ieee80211_debugfs_key_remove(key);
- list_del(&key->list);
-
kfree(key);
}
void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_key *key, *tmp;
+ LIST_HEAD(tmp_list);
+
+ ASSERT_RTNL();
+ might_sleep();
list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
ieee80211_key_free(key);
{
struct ieee80211_key *key;
- WARN_ON(!netif_running(sdata->dev));
- if (!netif_running(sdata->dev))
+ ASSERT_RTNL();
+ might_sleep();
+
+ if (WARN_ON(!netif_running(sdata->dev)))
return;
list_for_each_entry(key, &sdata->key_list, list)
{
struct ieee80211_key *key;
+ ASSERT_RTNL();
+ might_sleep();
+
list_for_each_entry(key, &sdata->key_list, list)
ieee80211_key_disable_hw_accel(key);
}
projects / linux-2.6-omap-h63xx.git / blobdiff