#include <net/mac80211.h>
#include "ieee80211_i.h"
+#include "driver-ops.h"
#include "rate.h"
#include "sta_info.h"
#include "debugfs_sta.h"
* for faster lookup and a list for iteration. They are managed using
* RCU, i.e. access to the list and hash table is protected by RCU.
*
- * Upon allocating a STA info structure with sta_info_alloc(), the caller owns
- * that structure. It must then either destroy it using sta_info_destroy()
- * (which is pretty useless) or insert it into the hash table using
- * sta_info_insert() which demotes the reference from ownership to a regular
- * RCU-protected reference; if the function is called without protection by an
- * RCU critical section the reference is instantly invalidated. Note that the
- * caller may not do much with the STA info before inserting it, in particular,
- * it may not start any mesh peer link management or add encryption keys.
+ * Upon allocating a STA info structure with sta_info_alloc(), the caller
+ * owns that structure. It must then insert it into the hash table using
+ * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
+ * case (which acquires an rcu read section but must not be called from
+ * within one) will the pointer still be valid after the call. Note that
+ * the caller may not do much with the STA info before inserting it, in
+ * particular, it may not start any mesh peer link management or add
+ * encryption keys.
*
* When the insertion fails (sta_info_insert()) returns non-zero), the
* structure will have been freed by sta_info_insert()!
*
- * Because there are debugfs entries for each station, and adding those
- * must be able to sleep, it is also possible to "pin" a station entry,
- * that means it can be removed from the hash table but not be freed.
- * See the comment in __sta_info_unlink() for more information, this is
- * an internal capability only.
+ * Station entries are added by mac80211 when you establish a link with a
+ * peer. This means different things for the different type of interfaces
+ * we support. For a regular station this mean we add the AP sta when we
+ * receive an assocation response from the AP. For IBSS this occurs when
+ * get to know about a peer on the same IBSS. For WDS we add the sta for
+ * the peer imediately upon device open. When using AP mode we add stations
+ * for each respective station upon request from userspace through nl80211.
*
- * 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; 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.
+ * In order to remove a STA info structure, various sta_info_destroy_*()
+ * calls are available.
*
- * 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().
- *
- * 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
- * removed. All users of the structure need to be RCU protected so that
- * the structure won't be freed before they are done using it.
+ * There is no concept of ownership on a STA entry, each structure is
+ * owned by the global hash table/list until it is removed. All users of
+ * the structure need to be RCU protected so that the structure won't be
+ * freed before they are done using it.
*/
/* Caller must hold local->sta_lock */
{
struct sta_info *s;
- s = local->sta_hash[STA_HASH(sta->addr)];
+ s = local->sta_hash[STA_HASH(sta->sta.addr)];
if (!s)
return -ENOENT;
if (s == sta) {
- rcu_assign_pointer(local->sta_hash[STA_HASH(sta->addr)],
+ rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
s->hnext);
return 0;
}
}
/* protected by RCU */
-static struct sta_info *__sta_info_find(struct ieee80211_local *local,
- u8 *addr)
+struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
+ const u8 *addr)
{
+ struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
- sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]);
+ sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
+ rcu_read_lock_held() ||
+ lockdep_is_held(&local->sta_lock) ||
+ lockdep_is_held(&local->sta_mtx));
while (sta) {
- if (compare_ether_addr(sta->addr, addr) == 0)
+ if (sta->sdata == sdata &&
+ memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
break;
- sta = rcu_dereference(sta->hnext);
+ sta = rcu_dereference_check(sta->hnext,
+ rcu_read_lock_held() ||
+ lockdep_is_held(&local->sta_lock) ||
+ lockdep_is_held(&local->sta_mtx));
}
return sta;
}
-struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
+/*
+ * Get sta info either from the specified interface
+ * or from one of its vlans
+ */
+struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
+ const u8 *addr)
{
- return __sta_info_find(local, addr);
+ struct ieee80211_local *local = sdata->local;
+ struct sta_info *sta;
+
+ sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
+ rcu_read_lock_held() ||
+ lockdep_is_held(&local->sta_lock) ||
+ lockdep_is_held(&local->sta_mtx));
+ while (sta) {
+ if ((sta->sdata == sdata ||
+ sta->sdata->bss == sdata->bss) &&
+ memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
+ break;
+ sta = rcu_dereference_check(sta->hnext,
+ rcu_read_lock_held() ||
+ lockdep_is_held(&local->sta_lock) ||
+ lockdep_is_held(&local->sta_mtx));
+ }
+ return sta;
}
-EXPORT_SYMBOL(sta_info_get);
-struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
- struct net_device *dev)
+struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
+ int idx)
{
+ struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
int i = 0;
list_for_each_entry_rcu(sta, &local->sta_list, list) {
- if (dev && dev != sta->sdata->dev)
+ if (sdata != sta->sdata)
continue;
if (i < idx) {
++i;
/**
* __sta_info_free - internal STA free helper
*
+ * @local: pointer to the global information
* @sta: STA info to free
*
* This function must undo everything done by sta_info_alloc()
static void __sta_info_free(struct ieee80211_local *local,
struct sta_info *sta)
{
- DECLARE_MAC_BUF(mbuf);
-
- rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
- rate_control_put(sta->rate_ctrl);
+ if (sta->rate_ctrl) {
+ rate_control_free_sta(sta);
+ rate_control_put(sta->rate_ctrl);
+ }
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
- printk(KERN_DEBUG "%s: Destroyed STA %s\n",
- wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->addr));
+ printk(KERN_DEBUG "%s: Destroyed STA %pM\n",
+ wiphy_name(local->hw.wiphy), sta->sta.addr);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
kfree(sta);
}
-void sta_info_destroy(struct sta_info *sta)
+/* Caller must hold local->sta_lock */
+static void sta_info_hash_add(struct ieee80211_local *local,
+ struct sta_info *sta)
{
- struct ieee80211_local *local;
- struct sk_buff *skb;
- int i;
-
- might_sleep();
-
- if (!sta)
- return;
-
- local = sta->local;
-
- rate_control_remove_sta_debugfs(sta);
- ieee80211_sta_debugfs_remove(sta);
+ sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
+ rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
+}
-#ifdef CONFIG_MAC80211_MESH
- if (ieee80211_vif_is_mesh(&sta->sdata->vif))
- mesh_plink_deactivate(sta);
-#endif
+static void sta_unblock(struct work_struct *wk)
+{
+ struct sta_info *sta;
- /*
- * 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();
+ sta = container_of(wk, struct sta_info, drv_unblock_wk);
-#ifdef CONFIG_MAC80211_MESH
- if (ieee80211_vif_is_mesh(&sta->sdata->vif))
- del_timer_sync(&sta->plink_timer);
-#endif
+ if (sta->dead)
+ return;
- while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
- local->total_ps_buffered--;
- dev_kfree_skb_any(skb);
- }
+ if (!test_sta_flags(sta, WLAN_STA_PS_STA))
+ ieee80211_sta_ps_deliver_wakeup(sta);
+ else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL))
+ ieee80211_sta_ps_deliver_poll_response(sta);
+}
- while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
- dev_kfree_skb_any(skb);
+static int sta_prepare_rate_control(struct ieee80211_local *local,
+ struct sta_info *sta, gfp_t gfp)
+{
+ if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
+ return 0;
- for (i = 0; i < STA_TID_NUM; i++) {
- spin_lock_bh(&sta->lock);
- if (sta->ampdu_mlme.tid_rx[i])
- del_timer_sync(&sta->ampdu_mlme.tid_rx[i]->session_timer);
- if (sta->ampdu_mlme.tid_tx[i])
- del_timer_sync(&sta->ampdu_mlme.tid_tx[i]->addba_resp_timer);
- spin_unlock_bh(&sta->lock);
+ sta->rate_ctrl = rate_control_get(local->rate_ctrl);
+ sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
+ &sta->sta, gfp);
+ if (!sta->rate_ctrl_priv) {
+ rate_control_put(sta->rate_ctrl);
+ return -ENOMEM;
}
- __sta_info_free(local, sta);
-}
-
-
-/* Caller must hold local->sta_lock */
-static void sta_info_hash_add(struct ieee80211_local *local,
- struct sta_info *sta)
-{
- sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
- rcu_assign_pointer(local->sta_hash[STA_HASH(sta->addr)], sta);
+ return 0;
}
struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
int i;
- DECLARE_MAC_BUF(mbuf);
- sta = kzalloc(sizeof(*sta), gfp);
+ sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
if (!sta)
return NULL;
spin_lock_init(&sta->lock);
spin_lock_init(&sta->flaglock);
+ INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
- memcpy(sta->addr, addr, ETH_ALEN);
+ memcpy(sta->sta.addr, addr, ETH_ALEN);
sta->local = local;
sta->sdata = sdata;
- sta->rate_ctrl = rate_control_get(local->rate_ctrl);
- sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
- gfp);
- if (!sta->rate_ctrl_priv) {
- rate_control_put(sta->rate_ctrl);
+ if (sta_prepare_rate_control(local, sta, gfp)) {
kfree(sta);
return NULL;
}
* enable session_timer's data differentiation. refer to
* sta_rx_agg_session_timer_expired for useage */
sta->timer_to_tid[i] = i;
- /* tid to tx queue: initialize according to HW (0 is valid) */
- sta->tid_to_tx_q[i] = ieee80211_num_queues(&local->hw);
- /* rx */
- sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE;
- sta->ampdu_mlme.tid_rx[i] = NULL;
/* tx */
sta->ampdu_mlme.tid_state_tx[i] = HT_AGG_STATE_IDLE;
sta->ampdu_mlme.tid_tx[i] = NULL;
skb_queue_head_init(&sta->ps_tx_buf);
skb_queue_head_init(&sta->tx_filtered);
+ for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
+ sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
+
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
- printk(KERN_DEBUG "%s: Allocated STA %s\n",
- wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->addr));
+ printk(KERN_DEBUG "%s: Allocated STA %pM\n",
+ wiphy_name(local->hw.wiphy), sta->sta.addr);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
#ifdef CONFIG_MAC80211_MESH
return sta;
}
-int sta_info_insert(struct sta_info *sta)
+static int sta_info_finish_insert(struct sta_info *sta, bool async)
+{
+ struct ieee80211_local *local = sta->local;
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ struct station_info sinfo;
+ unsigned long flags;
+ int err = 0;
+
+ WARN_ON(!mutex_is_locked(&local->sta_mtx));
+
+ /* notify driver */
+ if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+ sdata = container_of(sdata->bss,
+ struct ieee80211_sub_if_data,
+ u.ap);
+ err = drv_sta_add(local, sdata, &sta->sta);
+ if (err) {
+ if (!async)
+ return err;
+ printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to driver (%d)"
+ " - keeping it anyway.\n",
+ sdata->name, sta->sta.addr, err);
+ } else {
+ sta->uploaded = true;
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+ if (async)
+ printk(KERN_DEBUG "%s: Finished adding IBSS STA %pM\n",
+ wiphy_name(local->hw.wiphy), sta->sta.addr);
+#endif
+ }
+
+ sdata = sta->sdata;
+
+ if (!async) {
+ local->num_sta++;
+ local->sta_generation++;
+ smp_mb();
+
+ /* make the station visible */
+ spin_lock_irqsave(&local->sta_lock, flags);
+ sta_info_hash_add(local, sta);
+ spin_unlock_irqrestore(&local->sta_lock, flags);
+ }
+
+ list_add(&sta->list, &local->sta_list);
+
+ ieee80211_sta_debugfs_add(sta);
+ rate_control_add_sta_debugfs(sta);
+
+ sinfo.filled = 0;
+ sinfo.generation = local->sta_generation;
+ cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
+
+
+ return 0;
+}
+
+static void sta_info_finish_pending(struct ieee80211_local *local)
+{
+ struct sta_info *sta;
+ unsigned long flags;
+
+ spin_lock_irqsave(&local->sta_lock, flags);
+ while (!list_empty(&local->sta_pending_list)) {
+ sta = list_first_entry(&local->sta_pending_list,
+ struct sta_info, list);
+ list_del(&sta->list);
+ spin_unlock_irqrestore(&local->sta_lock, flags);
+
+ sta_info_finish_insert(sta, true);
+
+ spin_lock_irqsave(&local->sta_lock, flags);
+ }
+ spin_unlock_irqrestore(&local->sta_lock, flags);
+}
+
+static void sta_info_finish_work(struct work_struct *work)
+{
+ struct ieee80211_local *local =
+ container_of(work, struct ieee80211_local, sta_finish_work);
+
+ mutex_lock(&local->sta_mtx);
+ sta_info_finish_pending(local);
+ mutex_unlock(&local->sta_mtx);
+}
+
+int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
{
struct ieee80211_local *local = sta->local;
struct ieee80211_sub_if_data *sdata = sta->sdata;
unsigned long flags;
int err = 0;
- DECLARE_MAC_BUF(mac);
/*
* Can't be a WARN_ON because it can be triggered through a race:
* something inserts a STA (on one CPU) without holding the RTNL
* and another CPU turns off the net device.
*/
- if (unlikely(!netif_running(sdata->dev))) {
+ if (unlikely(!ieee80211_sdata_running(sdata))) {
err = -ENETDOWN;
+ rcu_read_lock();
goto out_free;
}
- if (WARN_ON(compare_ether_addr(sta->addr, sdata->dev->dev_addr) == 0 ||
- is_multicast_ether_addr(sta->addr))) {
+ if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 ||
+ is_multicast_ether_addr(sta->sta.addr))) {
err = -EINVAL;
+ rcu_read_lock();
goto out_free;
}
+ /*
+ * In ad-hoc mode, we sometimes need to insert stations
+ * from tasklet context from the RX path. To avoid races,
+ * always do so in that case -- see the comment below.
+ */
+ if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+ spin_lock_irqsave(&local->sta_lock, flags);
+ /* check if STA exists already */
+ if (sta_info_get_bss(sdata, sta->sta.addr)) {
+ spin_unlock_irqrestore(&local->sta_lock, flags);
+ rcu_read_lock();
+ err = -EEXIST;
+ goto out_free;
+ }
+
+ local->num_sta++;
+ local->sta_generation++;
+ smp_mb();
+ sta_info_hash_add(local, sta);
+
+ list_add_tail(&sta->list, &local->sta_pending_list);
+
+ rcu_read_lock();
+ spin_unlock_irqrestore(&local->sta_lock, flags);
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+ printk(KERN_DEBUG "%s: Added IBSS STA %pM\n",
+ wiphy_name(local->hw.wiphy), sta->sta.addr);
+#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
+
+ ieee80211_queue_work(&local->hw, &local->sta_finish_work);
+
+ return 0;
+ }
+
+ /*
+ * On first glance, this will look racy, because the code
+ * below this point, which inserts a station with sleeping,
+ * unlocks the sta_lock between checking existence in the
+ * hash table and inserting into it.
+ *
+ * However, it is not racy against itself because it keeps
+ * the mutex locked. It still seems to race against the
+ * above code that atomically inserts the station... That,
+ * however, is not true because the above code can only
+ * be invoked for IBSS interfaces, and the below code will
+ * not be -- and the two do not race against each other as
+ * the hash table also keys off the interface.
+ */
+
+ might_sleep();
+
+ mutex_lock(&local->sta_mtx);
+
spin_lock_irqsave(&local->sta_lock, flags);
/* check if STA exists already */
- if (__sta_info_find(local, sta->addr)) {
+ if (sta_info_get_bss(sdata, sta->sta.addr)) {
spin_unlock_irqrestore(&local->sta_lock, flags);
+ mutex_unlock(&local->sta_mtx);
+ rcu_read_lock();
err = -EEXIST;
goto out_free;
}
- list_add(&sta->list, &local->sta_list);
- local->num_sta++;
- sta_info_hash_add(local, sta);
- /* notify driver */
- if (local->ops->sta_notify) {
- if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
- sdata = sdata->u.vlan.ap;
+ spin_unlock_irqrestore(&local->sta_lock, flags);
- local->ops->sta_notify(local_to_hw(local), &sdata->vif,
- STA_NOTIFY_ADD, sta->addr);
+ err = sta_info_finish_insert(sta, false);
+ if (err) {
+ mutex_unlock(&local->sta_mtx);
+ rcu_read_lock();
+ goto out_free;
}
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
- printk(KERN_DEBUG "%s: Inserted STA %s\n",
- wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr));
+ printk(KERN_DEBUG "%s: Inserted STA %pM\n",
+ wiphy_name(local->hw.wiphy), sta->sta.addr);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
- spin_unlock_irqrestore(&local->sta_lock, flags);
-
-#ifdef CONFIG_MAC80211_DEBUGFS
- /*
- * Debugfs entry adding might sleep, so schedule process
- * context task for adding entry for STAs that do not yet
- * have one.
- * NOTE: due to auto-freeing semantics this may only be done
- * if the insertion is successful!
- */
- schedule_work(&local->sta_debugfs_add);
-#endif
+ /* move reference to rcu-protected */
+ rcu_read_lock();
+ mutex_unlock(&local->sta_mtx);
if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_accept_plinks_update(sdata);
return err;
}
+int sta_info_insert(struct sta_info *sta)
+{
+ int err = sta_info_insert_rcu(sta);
+
+ rcu_read_unlock();
+
+ return err;
+}
+
static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
{
/*
static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
struct sta_info *sta)
{
- if (bss)
- __bss_tim_set(bss, sta->aid);
+ BUG_ON(!bss);
+
+ __bss_tim_set(bss, sta->sta.aid);
+
if (sta->local->ops->set_tim) {
sta->local->tim_in_locked_section = true;
- sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 1);
+ drv_set_tim(sta->local, &sta->sta, true);
sta->local->tim_in_locked_section = false;
}
}
{
unsigned long flags;
+ BUG_ON(!sta->sdata->bss);
+
spin_lock_irqsave(&sta->local->sta_lock, flags);
__sta_info_set_tim_bit(sta->sdata->bss, sta);
spin_unlock_irqrestore(&sta->local->sta_lock, flags);
static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
struct sta_info *sta)
{
- if (bss)
- __bss_tim_clear(bss, sta->aid);
+ BUG_ON(!bss);
+
+ __bss_tim_clear(bss, sta->sta.aid);
+
if (sta->local->ops->set_tim) {
sta->local->tim_in_locked_section = true;
- sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 0);
+ drv_set_tim(sta->local, &sta->sta, false);
sta->local->tim_in_locked_section = false;
}
}
{
unsigned long flags;
+ BUG_ON(!sta->sdata->bss);
+
spin_lock_irqsave(&sta->local->sta_lock, flags);
__sta_info_clear_tim_bit(sta->sdata->bss, sta);
spin_unlock_irqrestore(&sta->local->sta_lock, flags);
}
-void __sta_info_unlink(struct sta_info **sta)
-{
- struct ieee80211_local *local = (*sta)->local;
- struct ieee80211_sub_if_data *sdata = (*sta)->sdata;
-#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
- DECLARE_MAC_BUF(mbuf);
-#endif
- /*
- * pull caller's reference if we're already gone.
- */
- if (sta_info_hash_del(local, *sta)) {
- *sta = NULL;
- return;
- }
-
- if ((*sta)->key) {
- ieee80211_key_free((*sta)->key);
- WARN_ON((*sta)->key);
- }
-
- list_del(&(*sta)->list);
-
- if (test_and_clear_sta_flags(*sta, WLAN_STA_PS)) {
- if (sdata->bss)
- atomic_dec(&sdata->bss->num_sta_ps);
- __sta_info_clear_tim_bit(sdata->bss, *sta);
- }
-
- local->num_sta--;
-
- if (local->ops->sta_notify) {
- if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
- sdata = sdata->u.vlan.ap;
-
- local->ops->sta_notify(local_to_hw(local), &sdata->vif,
- STA_NOTIFY_REMOVE, (*sta)->addr);
- }
-
- if (ieee80211_vif_is_mesh(&sdata->vif)) {
- mesh_accept_plinks_update(sdata);
-#ifdef CONFIG_MAC80211_MESH
- del_timer(&(*sta)->plink_timer);
-#endif
- }
-
-#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
- printk(KERN_DEBUG "%s: Removed STA %s\n",
- wiphy_name(local->hw.wiphy), print_mac(mbuf, (*sta)->addr));
-#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
-
- /*
- * Finally, pull caller's reference if the STA is pinned by the
- * task that is adding the debugfs entries. In that case, we
- * leave the STA "to be freed".
- *
- * The rules are not trivial, but not too complex either:
- * (1) pin_status is only modified under the sta_lock
- * (2) STAs may only be pinned under the RTNL so that
- * sta_info_flush() is guaranteed to actually destroy
- * all STAs that are active for a given interface, this
- * is required for correctness because otherwise we
- * could notify a driver that an interface is going
- * away and only after that (!) notify it about a STA
- * on that interface going away.
- * (3) sta_info_debugfs_add_work() will set the status
- * to PINNED when it found an item that needs a new
- * debugfs directory created. In that case, that item
- * must not be freed although all *RCU* users are done
- * with it. Hence, we tell the caller of _unlink()
- * that the item is already gone (as can happen when
- * two tasks try to unlink/destroy at the same time)
- * (4) We set the pin_status to DESTROY here when we
- * find such an item.
- * (5) sta_info_debugfs_add_work() will reset the pin_status
- * from PINNED to NORMAL when it is done with the item,
- * but will check for DESTROY before resetting it in
- * which case it will free the item.
- */
- if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) {
- (*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY;
- *sta = NULL;
- return;
- }
-}
-
-void sta_info_unlink(struct sta_info **sta)
-{
- struct ieee80211_local *local = (*sta)->local;
- unsigned long flags;
-
- spin_lock_irqsave(&local->sta_lock, flags);
- __sta_info_unlink(sta);
- spin_unlock_irqrestore(&local->sta_lock, flags);
-}
-
-static inline int sta_info_buffer_expired(struct ieee80211_local *local,
- struct sta_info *sta,
- struct sk_buff *skb)
+static int sta_info_buffer_expired(struct sta_info *sta,
+ struct sk_buff *skb)
{
struct ieee80211_tx_info *info;
int timeout;
info = IEEE80211_SKB_CB(skb);
/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
- timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
- 15625) * HZ;
+ timeout = (sta->listen_interval *
+ sta->sdata->vif.bss_conf.beacon_int *
+ 32 / 15625) * HZ;
if (timeout < STA_TX_BUFFER_EXPIRE)
timeout = STA_TX_BUFFER_EXPIRE;
return time_after(jiffies, info->control.jiffies + timeout);
}
-static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
+static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
struct sta_info *sta)
{
unsigned long flags;
struct sk_buff *skb;
struct ieee80211_sub_if_data *sdata;
- DECLARE_MAC_BUF(mac);
if (skb_queue_empty(&sta->ps_tx_buf))
- return;
+ return false;
for (;;) {
spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
skb = skb_peek(&sta->ps_tx_buf);
- if (sta_info_buffer_expired(local, sta, skb))
+ if (sta_info_buffer_expired(sta, skb))
skb = __skb_dequeue(&sta->ps_tx_buf);
else
skb = NULL;
sdata = sta->sdata;
local->total_ps_buffered--;
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
- printk(KERN_DEBUG "Buffered frame expired (STA "
- "%s)\n", print_mac(mac, sta->addr));
+ printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
+ sta->sta.addr);
#endif
dev_kfree_skb(skb);
if (skb_queue_empty(&sta->ps_tx_buf))
sta_info_clear_tim_bit(sta);
}
-}
+ return true;
+}
-static void sta_info_cleanup(unsigned long data)
+static int __must_check __sta_info_destroy(struct sta_info *sta)
{
- struct ieee80211_local *local = (struct ieee80211_local *) data;
- struct sta_info *sta;
+ struct ieee80211_local *local;
+ struct ieee80211_sub_if_data *sdata;
+ struct sk_buff *skb;
+ unsigned long flags;
+ int ret;
- rcu_read_lock();
- list_for_each_entry_rcu(sta, &local->sta_list, list)
- sta_info_cleanup_expire_buffered(local, sta);
- rcu_read_unlock();
+ might_sleep();
- local->sta_cleanup.expires =
- round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
- add_timer(&local->sta_cleanup);
-}
+ if (!sta)
+ return -ENOENT;
-#ifdef CONFIG_MAC80211_DEBUGFS
-/*
- * See comment in __sta_info_unlink,
- * caller must hold local->sta_lock.
- */
-static void __sta_info_pin(struct sta_info *sta)
-{
- WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL);
- sta->pin_status = STA_INFO_PIN_STAT_PINNED;
-}
+ local = sta->local;
+ sdata = sta->sdata;
-/*
- * See comment in __sta_info_unlink, returns sta if it
- * needs to be destroyed.
- */
-static struct sta_info *__sta_info_unpin(struct sta_info *sta)
-{
- struct sta_info *ret = NULL;
- unsigned long flags;
+ /*
+ * Before removing the station from the driver and
+ * rate control, it might still start new aggregation
+ * sessions -- block that to make sure the tear-down
+ * will be sufficient.
+ */
+ set_sta_flags(sta, WLAN_STA_BLOCK_BA);
+ ieee80211_sta_tear_down_BA_sessions(sta);
- spin_lock_irqsave(&sta->local->sta_lock, flags);
- WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY &&
- sta->pin_status != STA_INFO_PIN_STAT_PINNED);
- if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY)
- ret = sta;
- sta->pin_status = STA_INFO_PIN_STAT_NORMAL;
- spin_unlock_irqrestore(&sta->local->sta_lock, flags);
+ spin_lock_irqsave(&local->sta_lock, flags);
+ ret = sta_info_hash_del(local, sta);
+ /* this might still be the pending list ... which is fine */
+ if (!ret)
+ list_del(&sta->list);
+ spin_unlock_irqrestore(&local->sta_lock, flags);
+ if (ret)
+ return ret;
+
+ if (sta->key) {
+ ieee80211_key_free(sta->key);
+ /*
+ * 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();
+
+ WARN_ON(sta->key);
+ }
- return ret;
-}
+ sta->dead = true;
-static void sta_info_debugfs_add_work(struct work_struct *work)
-{
- struct ieee80211_local *local =
- container_of(work, struct ieee80211_local, sta_debugfs_add);
- struct sta_info *sta, *tmp;
- unsigned long flags;
+ if (test_and_clear_sta_flags(sta,
+ WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) {
+ BUG_ON(!sdata->bss);
- /* We need to keep the RTNL across the whole pinned status. */
- rtnl_lock();
- while (1) {
- sta = NULL;
+ atomic_dec(&sdata->bss->num_sta_ps);
+ __sta_info_clear_tim_bit(sdata->bss, sta);
+ }
- spin_lock_irqsave(&local->sta_lock, flags);
- list_for_each_entry(tmp, &local->sta_list, list) {
- if (!tmp->debugfs.dir) {
- sta = tmp;
- __sta_info_pin(sta);
- break;
- }
- }
- spin_unlock_irqrestore(&local->sta_lock, flags);
+ local->num_sta--;
+ local->sta_generation++;
- if (!sta)
- break;
+ if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+ rcu_assign_pointer(sdata->u.vlan.sta, NULL);
+
+ if (sta->uploaded) {
+ if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+ sdata = container_of(sdata->bss,
+ struct ieee80211_sub_if_data,
+ u.ap);
+ drv_sta_remove(local, sdata, &sta->sta);
+ sdata = sta->sdata;
+ }
- ieee80211_sta_debugfs_add(sta);
- rate_control_add_sta_debugfs(sta);
+ /*
+ * At this point, after we wait for an RCU grace period,
+ * neither mac80211 nor the driver can reference this
+ * sta struct any more except by still existing timers
+ * associated with this station that we clean up below.
+ */
+ synchronize_rcu();
+
+#ifdef CONFIG_MAC80211_MESH
+ if (ieee80211_vif_is_mesh(&sdata->vif))
+ mesh_accept_plinks_update(sdata);
+#endif
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+ printk(KERN_DEBUG "%s: Removed STA %pM\n",
+ wiphy_name(local->hw.wiphy), sta->sta.addr);
+#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
+ cancel_work_sync(&sta->drv_unblock_wk);
+
+ rate_control_remove_sta_debugfs(sta);
+ ieee80211_sta_debugfs_remove(sta);
- sta = __sta_info_unpin(sta);
- sta_info_destroy(sta);
+#ifdef CONFIG_MAC80211_MESH
+ if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
+ mesh_plink_deactivate(sta);
+ del_timer_sync(&sta->plink_timer);
}
- rtnl_unlock();
-}
#endif
-static void __ieee80211_run_pending_flush(struct ieee80211_local *local)
+ while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
+ local->total_ps_buffered--;
+ dev_kfree_skb_any(skb);
+ }
+
+ while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
+ dev_kfree_skb_any(skb);
+
+ __sta_info_free(local, sta);
+
+ return 0;
+}
+
+int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
{
struct sta_info *sta;
- unsigned long flags;
+ int ret;
- ASSERT_RTNL();
+ mutex_lock(&sdata->local->sta_mtx);
+ sta = sta_info_get(sdata, addr);
+ ret = __sta_info_destroy(sta);
+ mutex_unlock(&sdata->local->sta_mtx);
- spin_lock_irqsave(&local->sta_lock, flags);
- while (!list_empty(&local->sta_flush_list)) {
- sta = list_first_entry(&local->sta_flush_list,
- struct sta_info, list);
- list_del(&sta->list);
- spin_unlock_irqrestore(&local->sta_lock, flags);
- sta_info_destroy(sta);
- spin_lock_irqsave(&local->sta_lock, flags);
- }
- spin_unlock_irqrestore(&local->sta_lock, flags);
+ return ret;
}
-static void ieee80211_sta_flush_work(struct work_struct *work)
+int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
+ const u8 *addr)
{
- struct ieee80211_local *local =
- container_of(work, struct ieee80211_local, sta_flush_work);
+ struct sta_info *sta;
+ int ret;
- rtnl_lock();
- __ieee80211_run_pending_flush(local);
- rtnl_unlock();
+ mutex_lock(&sdata->local->sta_mtx);
+ sta = sta_info_get_bss(sdata, addr);
+ ret = __sta_info_destroy(sta);
+ mutex_unlock(&sdata->local->sta_mtx);
+
+ return ret;
+}
+
+static void sta_info_cleanup(unsigned long data)
+{
+ struct ieee80211_local *local = (struct ieee80211_local *) data;
+ struct sta_info *sta;
+ bool timer_needed = false;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sta, &local->sta_list, list)
+ if (sta_info_cleanup_expire_buffered(local, sta))
+ timer_needed = true;
+ rcu_read_unlock();
+
+ if (local->quiescing)
+ return;
+
+ if (!timer_needed)
+ return;
+
+ local->sta_cleanup.expires =
+ round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
+ add_timer(&local->sta_cleanup);
}
void sta_info_init(struct ieee80211_local *local)
{
spin_lock_init(&local->sta_lock);
+ mutex_init(&local->sta_mtx);
INIT_LIST_HEAD(&local->sta_list);
- INIT_LIST_HEAD(&local->sta_flush_list);
- INIT_WORK(&local->sta_flush_work, ieee80211_sta_flush_work);
+ INIT_LIST_HEAD(&local->sta_pending_list);
+ INIT_WORK(&local->sta_finish_work, sta_info_finish_work);
setup_timer(&local->sta_cleanup, sta_info_cleanup,
(unsigned long)local);
local->sta_cleanup.expires =
round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
-
-#ifdef CONFIG_MAC80211_DEBUGFS
- INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work);
-#endif
}
int sta_info_start(struct ieee80211_local *local)
void sta_info_stop(struct ieee80211_local *local)
{
del_timer(&local->sta_cleanup);
- cancel_work_sync(&local->sta_flush_work);
-#ifdef CONFIG_MAC80211_DEBUGFS
- /*
- * Make sure the debugfs adding work isn't pending after this
- * because we're about to be destroyed. It doesn't matter
- * whether it ran or not since we're going to flush all STAs
- * anyway.
- */
- cancel_work_sync(&local->sta_debugfs_add);
-#endif
-
- rtnl_lock();
sta_info_flush(local, NULL);
- __ieee80211_run_pending_flush(local);
- rtnl_unlock();
}
/**
* @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
*/
int sta_info_flush(struct ieee80211_local *local,
- struct ieee80211_sub_if_data *sdata)
+ struct ieee80211_sub_if_data *sdata)
{
struct sta_info *sta, *tmp;
- LIST_HEAD(tmp_list);
int ret = 0;
- unsigned long flags;
might_sleep();
- ASSERT_RTNL();
- spin_lock_irqsave(&local->sta_lock, flags);
+ mutex_lock(&local->sta_mtx);
+
+ sta_info_finish_pending(local);
+
list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
- if (!sdata || sdata == sta->sdata) {
- __sta_info_unlink(&sta);
- if (sta) {
- list_add_tail(&sta->list, &tmp_list);
- ret++;
- }
- }
+ if (!sdata || sdata == sta->sdata)
+ WARN_ON(__sta_info_destroy(sta));
}
- spin_unlock_irqrestore(&local->sta_lock, flags);
-
- list_for_each_entry_safe(sta, tmp, &tmp_list, list)
- sta_info_destroy(sta);
+ mutex_unlock(&local->sta_mtx);
return ret;
}
-/**
- * sta_info_flush_delayed - flush matching STA entries from the STA table
- *
- * This function unlinks all stations for a given interface and queues
- * them for freeing. Note that the workqueue function scheduled here has
- * to run before any new keys can be added to the system to avoid set_key()
- * callback ordering issues.
- *
- * @sdata: the interface
- */
-void sta_info_flush_delayed(struct ieee80211_sub_if_data *sdata)
+void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
+ unsigned long exp_time)
{
struct ieee80211_local *local = sdata->local;
struct sta_info *sta, *tmp;
- unsigned long flags;
- bool work = false;
- spin_lock_irqsave(&local->sta_lock, flags);
- list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
- if (sdata == sta->sdata) {
- __sta_info_unlink(&sta);
- if (sta) {
- list_add_tail(&sta->list,
- &local->sta_flush_list);
- work = true;
- }
+ mutex_lock(&local->sta_mtx);
+ list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
+ if (time_after(jiffies, sta->last_rx + exp_time)) {
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
+ sdata->name, sta->sta.addr);
+#endif
+ WARN_ON(__sta_info_destroy(sta));
}
+ mutex_unlock(&local->sta_mtx);
+}
+
+struct ieee80211_sta *ieee80211_find_sta_by_hw(struct ieee80211_hw *hw,
+ const u8 *addr)
+{
+ struct sta_info *sta, *nxt;
+
+ /* Just return a random station ... first in list ... */
+ for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
+ if (!sta->uploaded)
+ return NULL;
+ return &sta->sta;
}
- if (work)
- schedule_work(&local->sta_flush_work);
- spin_unlock_irqrestore(&local->sta_lock, flags);
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_hw);
+
+struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
+ const u8 *addr)
+{
+ struct sta_info *sta;
+
+ if (!vif)
+ return NULL;
+
+ sta = sta_info_get_bss(vif_to_sdata(vif), addr);
+ if (!sta)
+ return NULL;
+
+ if (!sta->uploaded)
+ return NULL;
+
+ return &sta->sta;
+}
+EXPORT_SYMBOL(ieee80211_find_sta);
+
+/* powersave support code */
+void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
+{
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ struct ieee80211_local *local = sdata->local;
+ int sent, buffered;
+
+ drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
+
+ if (!skb_queue_empty(&sta->ps_tx_buf))
+ sta_info_clear_tim_bit(sta);
+
+ /* Send all buffered frames to the station */
+ sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
+ buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
+ sent += buffered;
+ local->total_ps_buffered -= buffered;
+
+#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
+ printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
+ "since STA not sleeping anymore\n", sdata->name,
+ sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
+#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
+}
+
+void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
+{
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ struct ieee80211_local *local = sdata->local;
+ struct sk_buff *skb;
+ int no_pending_pkts;
+
+ skb = skb_dequeue(&sta->tx_filtered);
+ if (!skb) {
+ skb = skb_dequeue(&sta->ps_tx_buf);
+ if (skb)
+ local->total_ps_buffered--;
+ }
+ no_pending_pkts = skb_queue_empty(&sta->tx_filtered) &&
+ skb_queue_empty(&sta->ps_tx_buf);
+
+ if (skb) {
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_hdr *hdr =
+ (struct ieee80211_hdr *) skb->data;
+
+ /*
+ * Tell TX path to send this frame even though the STA may
+ * still remain is PS mode after this frame exchange.
+ */
+ info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
+
+#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
+ printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
+ sta->sta.addr, sta->sta.aid,
+ skb_queue_len(&sta->ps_tx_buf));
+#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
+
+ /* Use MoreData flag to indicate whether there are more
+ * buffered frames for this STA */
+ if (no_pending_pkts)
+ hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
+ else
+ hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+
+ ieee80211_add_pending_skb(local, skb);
+
+ if (no_pending_pkts)
+ sta_info_clear_tim_bit(sta);
+#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
+ } else {
+ /*
+ * FIXME: This can be the result of a race condition between
+ * us expiring a frame and the station polling for it.
+ * Should we send it a null-func frame indicating we
+ * have nothing buffered for it?
+ */
+ printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
+ "though there are no buffered frames for it\n",
+ sdata->name, sta->sta.addr);
+#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
+ }
+}
+
+void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
+ struct ieee80211_sta *pubsta, bool block)
+{
+ struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+
+ trace_api_sta_block_awake(sta->local, pubsta, block);
+
+ if (block)
+ set_sta_flags(sta, WLAN_STA_PS_DRIVER);
+ else
+ ieee80211_queue_work(hw, &sta->drv_unblock_wk);
}
+EXPORT_SYMBOL(ieee80211_sta_block_awake);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff