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-rw-r--r--net/mac80211/cfg.c44
-rw-r--r--net/mac80211/debugfs_key.c37
-rw-r--r--net/mac80211/debugfs_key.h11
-rw-r--r--net/mac80211/ieee80211.c6
-rw-r--r--net/mac80211/ieee80211_i.h4
-rw-r--r--net/mac80211/ieee80211_ioctl.c26
-rw-r--r--net/mac80211/ieee80211_key.h20
-rw-r--r--net/mac80211/ieee80211_sta.c9
-rw-r--r--net/mac80211/key.c408
-rw-r--r--net/mac80211/sta_info.c48
-rw-r--r--net/mac80211/sta_info.h1
11 files changed, 385 insertions, 229 deletions
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 5f8db5cab65d..fe05a7b85dc6 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -135,6 +135,7 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
struct sta_info *sta = NULL;
enum ieee80211_key_alg alg;
struct ieee80211_key *key;
+ int err;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
@@ -157,17 +158,24 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
if (!key)
return -ENOMEM;
+ rcu_read_lock();
+
if (mac_addr) {
sta = sta_info_get(sdata->local, mac_addr);
if (!sta) {
ieee80211_key_free(key);
- return -ENOENT;
+ err = -ENOENT;
+ goto out_unlock;
}
}
ieee80211_key_link(key, sdata, sta);
- return 0;
+ err = 0;
+ out_unlock:
+ rcu_read_unlock();
+
+ return err;
}
static int ieee80211_del_key(struct wiphy *wiphy, struct net_device *dev,
@@ -179,28 +187,37 @@ static int ieee80211_del_key(struct wiphy *wiphy, struct net_device *dev,
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+ rcu_read_lock();
+
if (mac_addr) {
+ ret = -ENOENT;
+
sta = sta_info_get(sdata->local, mac_addr);
if (!sta)
- return -ENOENT;
+ goto out_unlock;
- ret = 0;
if (sta->key) {
ieee80211_key_free(sta->key);
WARN_ON(sta->key);
- } else
- ret = -ENOENT;
+ ret = 0;
+ }
- return ret;
+ goto out_unlock;
}
- if (!sdata->keys[key_idx])
- return -ENOENT;
+ if (!sdata->keys[key_idx]) {
+ ret = -ENOENT;
+ goto out_unlock;
+ }
ieee80211_key_free(sdata->keys[key_idx]);
WARN_ON(sdata->keys[key_idx]);
- return 0;
+ ret = 0;
+ out_unlock:
+ rcu_read_unlock();
+
+ return ret;
}
static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev,
@@ -217,6 +234,8 @@ static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev,
u16 iv16;
int err = -ENOENT;
+ rcu_read_lock();
+
if (mac_addr) {
sta = sta_info_get(sdata->local, mac_addr);
if (!sta)
@@ -280,6 +299,7 @@ static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev,
err = 0;
out:
+ rcu_read_unlock();
return err;
}
@@ -289,9 +309,13 @@ static int ieee80211_config_default_key(struct wiphy *wiphy,
{
struct ieee80211_sub_if_data *sdata;
+ rcu_read_lock();
+
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
ieee80211_set_default_key(sdata, key_idx);
+ rcu_read_unlock();
+
return 0;
}
diff --git a/net/mac80211/debugfs_key.c b/net/mac80211/debugfs_key.c
index c881524c8725..459f0767fae5 100644
--- a/net/mac80211/debugfs_key.c
+++ b/net/mac80211/debugfs_key.c
@@ -184,23 +184,35 @@ KEY_OPS(key);
key->debugfs.name = debugfs_create_file(#name, 0400,\
key->debugfs.dir, key, &key_##name##_ops);
-void ieee80211_debugfs_key_add(struct ieee80211_local *local,
- struct ieee80211_key *key)
-{
+void ieee80211_debugfs_key_add(struct ieee80211_key *key)
+ {
static int keycount;
- char buf[20];
+ char buf[50];
+ DECLARE_MAC_BUF(mac);
+ struct sta_info *sta;
- if (!local->debugfs.keys)
+ if (!key->local->debugfs.keys)
return;
sprintf(buf, "%d", keycount);
keycount++;
key->debugfs.dir = debugfs_create_dir(buf,
- local->debugfs.keys);
+ key->local->debugfs.keys);
if (!key->debugfs.dir)
return;
+ rcu_read_lock();
+ sta = rcu_dereference(key->sta);
+ if (sta)
+ sprintf(buf, "../../stations/%s", print_mac(mac, sta->addr));
+ rcu_read_unlock();
+
+ /* using sta as a boolean is fine outside RCU lock */
+ if (sta)
+ key->debugfs.stalink =
+ debugfs_create_symlink("station", key->debugfs.dir, buf);
+
DEBUGFS_ADD(keylen);
DEBUGFS_ADD(flags);
DEBUGFS_ADD(keyidx);
@@ -258,19 +270,6 @@ void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
debugfs_remove(sdata->debugfs.default_key);
sdata->debugfs.default_key = NULL;
}
-void ieee80211_debugfs_key_sta_link(struct ieee80211_key *key,
- struct sta_info *sta)
-{
- char buf[50];
- DECLARE_MAC_BUF(mac);
-
- if (!key->debugfs.dir)
- return;
-
- sprintf(buf, "../../stations/%s", print_mac(mac, sta->addr));
- key->debugfs.stalink =
- debugfs_create_symlink("station", key->debugfs.dir, buf);
-}
void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
struct sta_info *sta)
diff --git a/net/mac80211/debugfs_key.h b/net/mac80211/debugfs_key.h
index aecfce395da6..b1a3754ee240 100644
--- a/net/mac80211/debugfs_key.h
+++ b/net/mac80211/debugfs_key.h
@@ -2,18 +2,14 @@
#define __MAC80211_DEBUGFS_KEY_H
#ifdef CONFIG_MAC80211_DEBUGFS
-void ieee80211_debugfs_key_add(struct ieee80211_local *local,
- struct ieee80211_key *key);
+void ieee80211_debugfs_key_add(struct ieee80211_key *key);
void ieee80211_debugfs_key_remove(struct ieee80211_key *key);
void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata);
void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata);
-void ieee80211_debugfs_key_sta_link(struct ieee80211_key *key,
- struct sta_info *sta);
void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
struct sta_info *sta);
#else
-static inline void ieee80211_debugfs_key_add(struct ieee80211_local *local,
- struct ieee80211_key *key)
+static inline void ieee80211_debugfs_key_add(struct ieee80211_key *key)
{}
static inline void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
{}
@@ -23,9 +19,6 @@ static inline void ieee80211_debugfs_key_add_default(
static inline void ieee80211_debugfs_key_remove_default(
struct ieee80211_sub_if_data *sdata)
{}
-static inline void ieee80211_debugfs_key_sta_link(
- struct ieee80211_key *key, struct sta_info *sta)
-{}
static inline void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
struct sta_info *sta)
{}
diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index b3cf69edeed9..dbe993af8034 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -1868,6 +1868,12 @@ static void __exit ieee80211_exit(void)
{
rc80211_pid_exit();
+ /*
+ * For key todo, it'll be empty by now but the work
+ * might still be scheduled.
+ */
+ flush_scheduled_work();
+
if (mesh_allocated)
ieee80211s_stop();
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 8614c35544bb..7f4e7f93ee47 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -600,8 +600,8 @@ struct ieee80211_local {
/*
* The lock only protects the list, hash, timer and counter
* against manipulation, reads are done in RCU. Additionally,
- * the lock protects each BSS's TIM bitmap and a few items
- * in a STA info structure.
+ * the lock protects each BSS's TIM bitmap, a few items in
+ * STA info structures and various key pointers.
*/
spinlock_t sta_lock;
unsigned long num_sta;
diff --git a/net/mac80211/ieee80211_ioctl.c b/net/mac80211/ieee80211_ioctl.c
index 41130b303170..a611c8bc76bd 100644
--- a/net/mac80211/ieee80211_ioctl.c
+++ b/net/mac80211/ieee80211_ioctl.c
@@ -36,6 +36,7 @@ static int ieee80211_set_encryption(struct net_device *dev, u8 *sta_addr,
struct sta_info *sta;
struct ieee80211_key *key;
struct ieee80211_sub_if_data *sdata;
+ int err;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
@@ -46,23 +47,31 @@ static int ieee80211_set_encryption(struct net_device *dev, u8 *sta_addr,
}
if (remove) {
+ rcu_read_lock();
+
+ err = 0;
+
if (is_broadcast_ether_addr(sta_addr)) {
key = sdata->keys[idx];
} else {
sta = sta_info_get(local, sta_addr);
- if (!sta)
- return -ENOENT;
+ if (!sta) {
+ err = -ENOENT;
+ goto out_unlock;
+ }
key = sta->key;
}
ieee80211_key_free(key);
- return 0;
} else {
key = ieee80211_key_alloc(alg, idx, key_len, _key);
if (!key)
return -ENOMEM;
sta = NULL;
+ err = 0;
+
+ rcu_read_lock();
if (!is_broadcast_ether_addr(sta_addr)) {
set_tx_key = 0;
@@ -74,13 +83,15 @@ static int ieee80211_set_encryption(struct net_device *dev, u8 *sta_addr,
*/
if (idx != 0 && alg != ALG_WEP) {
ieee80211_key_free(key);
- return -EINVAL;
+ err = -EINVAL;
+ goto out_unlock;
}
sta = sta_info_get(local, sta_addr);
if (!sta) {
ieee80211_key_free(key);
- return -ENOENT;
+ err = -ENOENT;
+ goto out_unlock;
}
}
@@ -90,7 +101,10 @@ static int ieee80211_set_encryption(struct net_device *dev, u8 *sta_addr,
ieee80211_set_default_key(sdata, idx);
}
- return 0;
+ out_unlock:
+ rcu_read_unlock();
+
+ return err;
}
static int ieee80211_ioctl_siwgenie(struct net_device *dev,
diff --git a/net/mac80211/ieee80211_key.h b/net/mac80211/ieee80211_key.h
index d670e6dbfa39..467890c6fe81 100644
--- a/net/mac80211/ieee80211_key.h
+++ b/net/mac80211/ieee80211_key.h
@@ -51,13 +51,19 @@ struct sta_info;
*
* @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present
* in the hardware for TX crypto hardware acceleration.
- * @KEY_FLAG_REMOVE_FROM_HARDWARE: Indicates to the key code that this
- * key is present in the hardware (but it cannot be used for
- * hardware acceleration any more!)
+ * @KEY_FLAG_TODO_DELETE: Key is marked for deletion and will, after an
+ * RCU grace period, no longer be reachable other than from the
+ * todo list.
+ * @KEY_FLAG_TODO_HWACCEL: Key needs to be added to hardware acceleration.
+ * @KEY_FLAG_TODO_DEFKEY: Key is default key and debugfs needs to be updated.
+ * @KEY_FLAG_TODO_ADD_DEBUGFS: Key needs to be added to debugfs.
*/
enum ieee80211_internal_key_flags {
KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0),
- KEY_FLAG_REMOVE_FROM_HARDWARE = BIT(1),
+ KEY_FLAG_TODO_DELETE = BIT(1),
+ KEY_FLAG_TODO_HWACCEL = BIT(2),
+ KEY_FLAG_TODO_DEFKEY = BIT(3),
+ KEY_FLAG_TODO_ADD_DEBUGFS = BIT(4),
};
struct ieee80211_key {
@@ -65,8 +71,12 @@ struct ieee80211_key {
struct ieee80211_sub_if_data *sdata;
struct sta_info *sta;
+ /* for sdata list */
struct list_head list;
+ /* for todo list */
+ struct list_head todo;
+ /* protected by todo lock! */
unsigned int flags;
union {
@@ -142,4 +152,6 @@ void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata);
+void ieee80211_key_todo(void);
+
#endif /* IEEE80211_KEY_H */
diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index 2a3f8a8e9a43..3584a2bf0186 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -952,11 +952,8 @@ static void ieee80211_associated(struct net_device *dev,
rcu_read_unlock();
- if (disassoc && sta) {
- rtnl_lock();
+ if (disassoc && sta)
sta_info_destroy(sta);
- rtnl_unlock();
- }
if (disassoc) {
ifsta->state = IEEE80211_DISABLED;
@@ -3104,12 +3101,8 @@ static void ieee80211_sta_expire(struct net_device *dev, unsigned long exp_time)
}
spin_unlock_irqrestore(&local->sta_lock, flags);
- synchronize_rcu();
-
- rtnl_lock();
list_for_each_entry_safe(sta, tmp, &tmp_list, list)
sta_info_destroy(sta);
- rtnl_unlock();
}
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 5df9e0cc009f..711e36e54ff8 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -2,7 +2,7 @@
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
- * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -33,17 +33,78 @@
* There is currently no way of knowing this except by looking into
* debugfs.
*
- * All operations here are called under RTNL so no extra locking is
- * required.
+ * All key operations are protected internally so you can call them at
+ * any time.
*
- * 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.
+ * Within mac80211, key references are, just as STA structure references,
+ * protected by RCU. Note, however, that some things are unprotected,
+ * namely the key->sta dereferences within the hardware acceleration
+ * functions. This means that sta_info_destroy() must flush the key todo
+ * list.
+ *
+ * All the direct key list manipulation functions must not sleep because
+ * they can operate on STA info structs that are protected by RCU.
*/
static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
static const u8 zero_addr[ETH_ALEN];
+/* key mutex: used to synchronise todo runners */
+static DEFINE_MUTEX(key_mutex);
+static DEFINE_SPINLOCK(todo_lock);
+static LIST_HEAD(todo_list);
+
+static void key_todo(struct work_struct *work)
+{
+ ieee80211_key_todo();
+}
+
+static DECLARE_WORK(todo_work, key_todo);
+
+/**
+ * add_todo - add todo item for a key
+ *
+ * @key: key to add to do item for
+ * @flag: todo flag(s)
+ */
+static void add_todo(struct ieee80211_key *key, u32 flag)
+{
+ if (!key)
+ return;
+
+ spin_lock(&todo_lock);
+ key->flags |= flag;
+ /* only add if not already added */
+ if (list_empty(&key->todo))
+ list_add(&key->todo, &todo_list);
+ schedule_work(&todo_work);
+ spin_unlock(&todo_lock);
+}
+
+/**
+ * ieee80211_key_lock - lock the mac80211 key operation lock
+ *
+ * This locks the (global) mac80211 key operation lock, all
+ * key operations must be done under this lock.
+ */
+static void ieee80211_key_lock(void)
+{
+ mutex_lock(&key_mutex);
+}
+
+/**
+ * ieee80211_key_unlock - unlock the mac80211 key operation lock
+ */
+static void ieee80211_key_unlock(void)
+{
+ mutex_unlock(&key_mutex);
+}
+
+static void assert_key_lock(void)
+{
+ WARN_ON(!mutex_is_locked(&key_mutex));
+}
+
static const u8 *get_mac_for_key(struct ieee80211_key *key)
{
const u8 *addr = bcast_addr;
@@ -70,26 +131,23 @@ static void ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
int ret;
DECLARE_MAC_BUF(mac);
+ assert_key_lock();
+ might_sleep();
+
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->sdata->dev->dev_addr, addr,
&key->conf);
- if (!ret)
+ if (!ret) {
+ spin_lock(&todo_lock);
key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
+ spin_unlock(&todo_lock);
+ }
if (ret && ret != -ENOSPC && ret != -EOPNOTSUPP)
printk(KERN_ERR "mac80211-%s: failed to set key "
@@ -98,26 +156,24 @@ static void ieee80211_key_enable_hw_accel(struct ieee80211_key *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);
+ assert_key_lock();
+ might_sleep();
+
if (!key || !key->local->ops->set_key)
return;
- if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
- !(key->flags & KEY_FLAG_REMOVE_FROM_HARDWARE))
+ spin_lock(&todo_lock);
+ if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
+ spin_unlock(&todo_lock);
return;
+ }
+ spin_unlock(&todo_lock);
addr = get_mac_for_key(key);
@@ -131,8 +187,72 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
wiphy_name(key->local->hw.wiphy),
key->conf.keyidx, print_mac(mac, addr), ret);
- key->flags &= ~(KEY_FLAG_UPLOADED_TO_HARDWARE |
- KEY_FLAG_REMOVE_FROM_HARDWARE);
+ spin_lock(&todo_lock);
+ key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
+ spin_unlock(&todo_lock);
+}
+
+static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
+ int idx)
+{
+ struct ieee80211_key *key = NULL;
+
+ if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
+ key = sdata->keys[idx];
+
+ rcu_assign_pointer(sdata->default_key, key);
+
+ if (key)
+ add_todo(key, KEY_FLAG_TODO_DEFKEY);
+}
+
+void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sdata->local->sta_lock, flags);
+ __ieee80211_set_default_key(sdata, idx);
+ spin_unlock_irqrestore(&sdata->local->sta_lock, flags);
+}
+
+
+static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta,
+ struct ieee80211_key *old,
+ 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 && old && new->conf.keyidx != old->conf.keyidx);
+
+ if (old)
+ idx = old->conf.keyidx;
+ else
+ idx = new->conf.keyidx;
+
+ defkey = old && sdata->default_key == old;
+
+ 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 (old) {
+ /*
+ * We'll use an empty list to indicate that the key
+ * has already been removed.
+ */
+ list_del_init(&old->list);
+ }
}
struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
@@ -160,6 +280,7 @@ struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
key->conf.keylen = key_len;
memcpy(key->conf.key, key_data, key_len);
INIT_LIST_HEAD(&key->list);
+ INIT_LIST_HEAD(&key->todo);
if (alg == ALG_CCMP) {
/*
@@ -168,7 +289,7 @@ struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
*/
key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data);
if (!key->u.ccmp.tfm) {
- ieee80211_key_free(key);
+ kfree(key);
return NULL;
}
}
@@ -176,56 +297,14 @@ struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
return key;
}
-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;
+ unsigned long flags;
int idx;
- ASSERT_RTNL();
- might_sleep();
-
BUG_ON(!sdata);
BUG_ON(!key);
@@ -234,11 +313,7 @@ void ieee80211_key_link(struct ieee80211_key *key,
key->sdata = sdata;
key->sta = sta;
- ieee80211_debugfs_key_add(key->local, key);
-
if (sta) {
- ieee80211_debugfs_key_sta_link(key, sta);
-
/*
* some hardware cannot handle TKIP with QoS, so
* we indicate whether QoS could be in use.
@@ -249,7 +324,10 @@ void ieee80211_key_link(struct ieee80211_key *key,
if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
struct sta_info *ap;
- rcu_read_lock();
+ /*
+ * We're getting a sta pointer in,
+ * so must be under RCU read lock.
+ */
/* same here, the AP could be using QoS */
ap = sta_info_get(key->local, key->sdata->u.sta.bssid);
@@ -258,11 +336,11 @@ void ieee80211_key_link(struct ieee80211_key *key,
key->conf.flags |=
IEEE80211_KEY_FLAG_WMM_STA;
}
-
- rcu_read_unlock();
}
}
+ spin_lock_irqsave(&sdata->local->sta_lock, flags);
+
if (sta)
old_key = sta->key;
else
@@ -270,108 +348,150 @@ void ieee80211_key_link(struct ieee80211_key *key,
__ieee80211_key_replace(sdata, sta, old_key, key);
- if (old_key) {
- synchronize_rcu();
- ieee80211_key_free(old_key);
- }
+ spin_unlock_irqrestore(&sdata->local->sta_lock, flags);
+
+ /* free old key later */
+ add_todo(old_key, KEY_FLAG_TODO_DELETE);
+ add_todo(key, KEY_FLAG_TODO_ADD_DEBUGFS);
if (netif_running(sdata->dev))
- ieee80211_key_enable_hw_accel(key);
+ add_todo(key, KEY_FLAG_TODO_HWACCEL);
}
void ieee80211_key_free(struct ieee80211_key *key)
{
- ASSERT_RTNL();
- might_sleep();
+ unsigned long flags;
if (!key)
return;
+ /*
+ * Replace key with nothingness if it was ever used.
+ */
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);
+ spin_lock_irqsave(&key->sdata->local->sta_lock, flags);
+ __ieee80211_key_replace(key->sdata, key->sta,
+ key, NULL);
+ spin_unlock_irqrestore(&key->sdata->local->sta_lock, flags);
+ }
- /*
- * Do NOT remove this without looking at sta_info_destroy()
- */
- synchronize_rcu();
+ add_todo(key, KEY_FLAG_TODO_DELETE);
+}
- /*
- * 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);
- }
+void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_key *key;
- if (key->conf.alg == ALG_CCMP)
- ieee80211_aes_key_free(key->u.ccmp.tfm);
- ieee80211_debugfs_key_remove(key);
+ might_sleep();
- kfree(key);
+ if (WARN_ON(!netif_running(sdata->dev)))
+ return;
+
+ ieee80211_key_lock();
+
+ list_for_each_entry(key, &sdata->key_list, list)
+ ieee80211_key_enable_hw_accel(key);
+
+ ieee80211_key_unlock();
}
-void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx)
+void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata)
{
- struct ieee80211_key *key = NULL;
+ struct ieee80211_key *key;
- if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
- key = sdata->keys[idx];
+ might_sleep();
- if (sdata->default_key != key) {
- ieee80211_debugfs_key_remove_default(sdata);
+ ieee80211_key_lock();
- rcu_assign_pointer(sdata->default_key, key);
+ list_for_each_entry(key, &sdata->key_list, list)
+ ieee80211_key_disable_hw_accel(key);
- if (sdata->default_key)
- ieee80211_debugfs_key_add_default(sdata);
- }
+ ieee80211_key_unlock();
}
-void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
+static void __ieee80211_key_free(struct ieee80211_key *key)
{
- struct ieee80211_key *key, *tmp;
- LIST_HEAD(tmp_list);
+ if (!key)
+ return;
- ASSERT_RTNL();
- might_sleep();
+ ieee80211_key_disable_hw_accel(key);
- list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
- ieee80211_key_free(key);
+ if (key->conf.alg == ALG_CCMP)
+ ieee80211_aes_key_free(key->u.ccmp.tfm);
+ ieee80211_debugfs_key_remove(key);
+
+ kfree(key);
}
-void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
+static void __ieee80211_key_todo(void)
{
struct ieee80211_key *key;
+ bool work_done;
+ u32 todoflags;
- ASSERT_RTNL();
- might_sleep();
+ /*
+ * NB: sta_info_destroy relies on this!
+ */
+ synchronize_rcu();
+
+ spin_lock(&todo_lock);
+ while (!list_empty(&todo_list)) {
+ key = list_first_entry(&todo_list, struct ieee80211_key, todo);
+ list_del_init(&key->todo);
+ todoflags = key->flags & (KEY_FLAG_TODO_ADD_DEBUGFS |
+ KEY_FLAG_TODO_DEFKEY |
+ KEY_FLAG_TODO_HWACCEL |
+ KEY_FLAG_TODO_DELETE);
+ key->flags &= ~todoflags;
+ spin_unlock(&todo_lock);
+
+ work_done = false;
+
+ if (todoflags & KEY_FLAG_TODO_ADD_DEBUGFS) {
+ ieee80211_debugfs_key_add(key);
+ work_done = true;
+ }
+ if (todoflags & KEY_FLAG_TODO_DEFKEY) {
+ ieee80211_debugfs_key_remove_default(key->sdata);
+ ieee80211_debugfs_key_add_default(key->sdata);
+ work_done = true;
+ }
+ if (todoflags & KEY_FLAG_TODO_HWACCEL) {
+ ieee80211_key_enable_hw_accel(key);
+ work_done = true;
+ }
+ if (todoflags & KEY_FLAG_TODO_DELETE) {
+ __ieee80211_key_free(key);
+ work_done = true;
+ }
- if (WARN_ON(!netif_running(sdata->dev)))
- return;
+ WARN_ON(!work_done);
- list_for_each_entry(key, &sdata->key_list, list)
- ieee80211_key_enable_hw_accel(key);
+ spin_lock(&todo_lock);
+ }
+ spin_unlock(&todo_lock);
}
-void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata)
+void ieee80211_key_todo(void)
{
- struct ieee80211_key *key;
+ ieee80211_key_lock();
+ __ieee80211_key_todo();
+ ieee80211_key_unlock();
+}
- ASSERT_RTNL();
- might_sleep();
+void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_key *key, *tmp;
+ LIST_HEAD(tmp_list);
- list_for_each_entry(key, &sdata->key_list, list)
- ieee80211_key_disable_hw_accel(key);
+ ieee80211_key_lock();
+
+ ieee80211_debugfs_key_remove_default(sdata);
+
+ list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
+ ieee80211_key_free(key);
+
+ __ieee80211_key_todo();
+
+ ieee80211_key_unlock();
}
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index cedd73a0c875..5540cbf7c445 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -51,17 +51,15 @@
*
* In order to remove a STA info structure, the caller needs to first
* unlink it (sta_info_unlink()) from the list and hash tables and
- * then destroy it while holding the RTNL; sta_info_destroy() will wait
- * for an RCU grace period to elapse before actually freeing it. Due to
- * the pinning and the possibility of multiple callers trying to remove
- * the same STA info at the same time, sta_info_unlink() can clear the
- * STA info pointer it is passed to indicate that the STA info is owned
- * by somebody else now.
+ * then destroy it; sta_info_destroy() will wait for an RCU grace period
+ * to elapse before actually freeing it. Due to the pinning and the
+ * possibility of multiple callers trying to remove the same STA info at
+ * the same time, sta_info_unlink() can clear the STA info pointer it is
+ * passed to indicate that the STA info is owned by somebody else now.
*
* If sta_info_unlink() did not clear the pointer then the caller owns
* the STA info structure now and is responsible of destroying it with
- * a call to sta_info_destroy(), not before RCU synchronisation, of
- * course. Note that sta_info_destroy() must be protected by the RTNL.
+ * a call to sta_info_destroy().
*
* In all other cases, there is no concept of ownership on a STA entry,
* each structure is owned by the global hash table/list until it is
@@ -164,7 +162,6 @@ void sta_info_destroy(struct sta_info *sta)
struct sk_buff *skb;
int i;
- ASSERT_RTNL();
might_sleep();
if (!sta)
@@ -180,22 +177,16 @@ void sta_info_destroy(struct sta_info *sta)
mesh_plink_deactivate(sta);
#endif
- if (sta->key) {
- /*
- * NOTE: This will call synchronize_rcu() internally to
- * make sure no key references can be in use. We rely on
- * that when we take this branch to make sure nobody can
- * reference this STA struct any longer!
- */
- ieee80211_key_free(sta->key);
- WARN_ON(sta->key);
- } else {
- /*
- * Make sure that nobody can reference this STA struct
- * any longer.
- */
- synchronize_rcu();
- }
+ /*
+ * We have only unlinked the key, and actually destroying it
+ * may mean it is removed from hardware which requires that
+ * the key->sta pointer is still valid, so flush the key todo
+ * list here.
+ *
+ * ieee80211_key_todo() will synchronize_rcu() so after this
+ * nothing can reference this sta struct any more.
+ */
+ ieee80211_key_todo();
#ifdef CONFIG_MAC80211_MESH
if (ieee80211_vif_is_mesh(&sta->sdata->vif))
@@ -439,6 +430,11 @@ void __sta_info_unlink(struct sta_info **sta)
return;
}
+ if ((*sta)->key) {
+ ieee80211_key_free((*sta)->key);
+ WARN_ON((*sta)->key);
+ }
+
list_del(&(*sta)->list);
if ((*sta)->flags & WLAN_STA_PS) {
@@ -652,7 +648,7 @@ static void sta_info_debugfs_add_work(struct work_struct *work)
}
#endif
-void __ieee80211_run_pending_flush(struct ieee80211_local *local)
+static void __ieee80211_run_pending_flush(struct ieee80211_local *local)
{
struct sta_info *sta;
unsigned long flags;
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index ebb7b2b4d0b9..30fd328e9991 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -359,6 +359,5 @@ void sta_info_stop(struct ieee80211_local *local);
int sta_info_flush(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata);
void sta_info_flush_delayed(struct ieee80211_sub_if_data *sdata);
-void __ieee80211_run_pending_flush(struct ieee80211_local *local);
#endif /* STA_INFO_H */