#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
+#include <linux/timer.h>
+#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
-#include "ieee80211_rate.h"
+#include "driver-ops.h"
+#include "rate.h"
#include "sta_info.h"
#include "debugfs_sta.h"
+#include "mesh.h"
-/* 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)];
- local->sta_hash[STA_HASH(sta->addr)] = sta;
-}
-
+/**
+ * DOC: STA information lifetime rules
+ *
+ * STA info structures (&struct sta_info) are managed in a hash table
+ * 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.
+ *
+ * When the insertion fails (sta_info_insert()) returns non-zero), the
+ * structure will have been freed by sta_info_insert()!
+ *
+ * sta 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
+ * we receive a probe response or a beacon from target IBSS network. 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.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * 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.
+ */
/* Caller must hold local->sta_lock */
static int sta_info_hash_del(struct ieee80211_local *local,
{
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) {
- local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
+ rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
+ s->hnext);
return 0;
}
while (s->hnext && s->hnext != sta)
s = s->hnext;
if (s->hnext) {
- s->hnext = sta->hnext;
+ rcu_assign_pointer(s->hnext, sta->hnext);
return 0;
}
return -ENOENT;
}
-struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
+/* protected by RCU */
+struct sta_info *sta_info_get(struct ieee80211_local *local, const u8 *addr)
{
struct sta_info *sta;
- read_lock_bh(&local->sta_lock);
- sta = local->sta_hash[STA_HASH(addr)];
+ sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]);
while (sta) {
- if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
- __sta_info_get(sta);
+ if (memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
break;
- }
- sta = sta->hnext;
+ sta = rcu_dereference(sta->hnext);
}
- read_unlock_bh(&local->sta_lock);
-
return sta;
}
-EXPORT_SYMBOL(sta_info_get);
-int sta_info_min_txrate_get(struct ieee80211_local *local)
+struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
+ struct net_device *dev)
{
struct sta_info *sta;
- struct ieee80211_hw_mode *mode;
- int min_txrate = 9999999;
- int i;
-
- read_lock_bh(&local->sta_lock);
- mode = local->oper_hw_mode;
- for (i = 0; i < STA_HASH_SIZE; i++) {
- sta = local->sta_hash[i];
- while (sta) {
- if (sta->txrate < min_txrate)
- min_txrate = sta->txrate;
- sta = sta->hnext;
+ int i = 0;
+
+ list_for_each_entry_rcu(sta, &local->sta_list, list) {
+ if (dev && dev != sta->sdata->dev)
+ continue;
+ if (i < idx) {
+ ++i;
+ continue;
}
+ return sta;
}
- read_unlock_bh(&local->sta_lock);
- if (min_txrate == 9999999)
- min_txrate = 0;
- return mode->rates[min_txrate].rate;
+ return NULL;
}
+/**
+ * __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()
+ * that may happen before sta_info_insert().
+ */
+static void __sta_info_free(struct ieee80211_local *local,
+ struct sta_info *sta)
+{
+ rate_control_free_sta(sta);
+ rate_control_put(sta->rate_ctrl);
-static void sta_info_release(struct kref *kref)
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+ 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)
{
- struct sta_info *sta = container_of(kref, struct sta_info, kref);
- struct ieee80211_local *local = sta->local;
+ 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);
+
+#ifdef CONFIG_MAC80211_MESH
+ if (ieee80211_vif_is_mesh(&sta->sdata->vif))
+ mesh_plink_deactivate(sta);
+#endif
+
+ /*
+ * 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))
+ del_timer_sync(&sta->plink_timer);
+#endif
- /* free sta structure; it has already been removed from
- * hash table etc. external structures. Make sure that all
- * buffered frames are release (one might have been added
- * after sta_info_free() was called). */
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) {
+
+ while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
dev_kfree_skb_any(skb);
+
+ for (i = 0; i < STA_TID_NUM; i++) {
+ struct tid_ampdu_rx *tid_rx;
+ struct tid_ampdu_tx *tid_tx;
+
+ spin_lock_bh(&sta->lock);
+ tid_rx = sta->ampdu_mlme.tid_rx[i];
+ /* Make sure timer won't free the tid_rx struct, see below */
+ if (tid_rx)
+ tid_rx->shutdown = true;
+
+ spin_unlock_bh(&sta->lock);
+
+ /*
+ * Outside spinlock - shutdown is true now so that the timer
+ * won't free tid_rx, we have to do that now. Can't let the
+ * timer do it because we have to sync the timer outside the
+ * lock that it takes itself.
+ */
+ if (tid_rx) {
+ del_timer_sync(&tid_rx->session_timer);
+ kfree(tid_rx);
+ }
+
+ /*
+ * No need to do such complications for TX agg sessions, the
+ * path leading to freeing the tid_tx struct goes via a call
+ * from the driver, and thus needs to look up the sta struct
+ * again, which cannot be found when we get here. Hence, we
+ * just need to delete the timer and free the aggregation
+ * info; we won't be telling the peer about it then but that
+ * doesn't matter if we're not talking to it again anyway.
+ */
+ tid_tx = sta->ampdu_mlme.tid_tx[i];
+ if (tid_tx) {
+ del_timer_sync(&tid_tx->addba_resp_timer);
+ /*
+ * STA removed while aggregation session being
+ * started? Bit odd, but purge frames anyway.
+ */
+ skb_queue_purge(&tid_tx->pending);
+ kfree(tid_tx);
+ }
}
- rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
- rate_control_put(sta->rate_ctrl);
- kfree(sta);
+
+ __sta_info_free(local, sta);
}
-void sta_info_put(struct sta_info *sta)
+/* Caller must hold local->sta_lock */
+static void sta_info_hash_add(struct ieee80211_local *local,
+ struct sta_info *sta)
{
- kref_put(&sta->kref, sta_info_release);
+ sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
+ rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
}
-EXPORT_SYMBOL(sta_info_put);
-
-struct sta_info * sta_info_add(struct ieee80211_local *local,
- struct net_device *dev, u8 *addr, gfp_t gfp)
+struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
+ u8 *addr, gfp_t gfp)
{
+ struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
- DECLARE_MAC_BUF(mac);
+ int i;
- sta = kzalloc(sizeof(*sta), gfp);
+ sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
if (!sta)
return NULL;
- kref_init(&sta->kref);
+ spin_lock_init(&sta->lock);
+ spin_lock_init(&sta->flaglock);
+
+ 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);
+ 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);
kfree(sta);
return NULL;
}
- memcpy(sta->addr, addr, ETH_ALEN);
- sta->local = local;
- sta->dev = dev;
+ for (i = 0; i < STA_TID_NUM; i++) {
+ /* timer_to_tid must be initialized with identity mapping to
+ * enable session_timer's data differentiation. refer to
+ * sta_rx_agg_session_timer_expired for useage */
+ sta->timer_to_tid[i] = i;
+ /* 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;
+ sta->ampdu_mlme.addba_req_num[i] = 0;
+ }
skb_queue_head_init(&sta->ps_tx_buf);
skb_queue_head_init(&sta->tx_filtered);
- __sta_info_get(sta); /* sta used by caller, decremented by
- * sta_info_put() */
- write_lock_bh(&local->sta_lock);
+
+ for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
+ sta->last_seq_ctrl[i] = cpu_to_le16(USHORT_MAX);
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+ 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
+ sta->plink_state = PLINK_LISTEN;
+ init_timer(&sta->plink_timer);
+#endif
+
+ return sta;
+}
+
+int sta_info_insert(struct sta_info *sta)
+{
+ struct ieee80211_local *local = sta->local;
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ unsigned long flags;
+ int err = 0;
+
+ /*
+ * 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))) {
+ err = -ENETDOWN;
+ goto out_free;
+ }
+
+ if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->dev->dev_addr) == 0 ||
+ is_multicast_ether_addr(sta->sta.addr))) {
+ err = -EINVAL;
+ goto out_free;
+ }
+
+ spin_lock_irqsave(&local->sta_lock, flags);
+ /* check if STA exists already */
+ if (sta_info_get(local, sta->sta.addr)) {
+ spin_unlock_irqrestore(&local->sta_lock, flags);
+ err = -EEXIST;
+ goto out_free;
+ }
list_add(&sta->list, &local->sta_list);
+ local->sta_generation++;
local->num_sta++;
sta_info_hash_add(local, sta);
- if (local->ops->sta_table_notification)
- local->ops->sta_table_notification(local_to_hw(local),
- local->num_sta);
- write_unlock_bh(&local->sta_lock);
+
+ /* notify driver */
+ if (local->ops->sta_notify) {
+ if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+ sdata = container_of(sdata->bss,
+ struct ieee80211_sub_if_data,
+ u.ap);
+
+ drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD, &sta->sta);
+ sdata = sta->sdata;
+ }
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
- printk(KERN_DEBUG "%s: Added STA %s\n",
- local->mdev->name, print_mac(mac, 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
+ /*
+ * Debugfs entry adding might sleep, so schedule process
* context task for adding entry for STAs that do not yet
- * have one. */
- queue_work(local->hw.workqueue, &local->sta_debugfs_add);
+ * 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
- return sta;
+ if (ieee80211_vif_is_mesh(&sdata->vif))
+ mesh_accept_plinks_update(sdata);
+
+ return 0;
+ out_free:
+ BUG_ON(!err);
+ __sta_info_free(local, sta);
+ return err;
}
-/* Caller must hold local->sta_lock */
-void sta_info_remove(struct sta_info *sta)
+static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
{
- struct ieee80211_local *local = sta->local;
- struct ieee80211_sub_if_data *sdata;
+ /*
+ * This format has been mandated by the IEEE specifications,
+ * so this line may not be changed to use the __set_bit() format.
+ */
+ bss->tim[aid / 8] |= (1 << (aid % 8));
+}
- /* don't do anything if we've been removed already */
- if (sta_info_hash_del(local, sta))
- return;
+static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
+{
+ /*
+ * This format has been mandated by the IEEE specifications,
+ * so this line may not be changed to use the __clear_bit() format.
+ */
+ bss->tim[aid / 8] &= ~(1 << (aid % 8));
+}
+
+static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
+ struct sta_info *sta)
+{
+ BUG_ON(!bss);
- list_del(&sta->list);
- sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
- if (sta->flags & WLAN_STA_PS) {
- sta->flags &= ~WLAN_STA_PS;
- if (sdata->bss)
- atomic_dec(&sdata->bss->num_sta_ps);
+ __bss_tim_set(bss, sta->sta.aid);
+
+ if (sta->local->ops->set_tim) {
+ sta->local->tim_in_locked_section = true;
+ drv_set_tim(sta->local, &sta->sta, true);
+ sta->local->tim_in_locked_section = false;
}
- local->num_sta--;
- sta_info_remove_aid_ptr(sta);
+}
- if (local->ops->sta_table_notification)
- local->ops->sta_table_notification(local_to_hw(local),
- local->num_sta);
+void sta_info_set_tim_bit(struct sta_info *sta)
+{
+ 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);
}
-void sta_info_free(struct sta_info *sta)
+static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
+ struct sta_info *sta)
{
- struct sk_buff *skb;
- struct ieee80211_local *local = sta->local;
- DECLARE_MAC_BUF(mac);
+ BUG_ON(!bss);
- might_sleep();
+ __bss_tim_clear(bss, sta->sta.aid);
- write_lock_bh(&local->sta_lock);
- sta_info_remove(sta);
- write_unlock_bh(&local->sta_lock);
+ if (sta->local->ops->set_tim) {
+ sta->local->tim_in_locked_section = true;
+ drv_set_tim(sta->local, &sta->sta, false);
+ sta->local->tim_in_locked_section = false;
+ }
+}
- while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
- local->total_ps_buffered--;
- dev_kfree_skb(skb);
+void sta_info_clear_tim_bit(struct sta_info *sta)
+{
+ 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);
+}
+
+static void __sta_info_unlink(struct sta_info **sta)
+{
+ struct ieee80211_local *local = (*sta)->local;
+ struct ieee80211_sub_if_data *sdata = (*sta)->sdata;
+ /*
+ * pull caller's reference if we're already gone.
+ */
+ if (sta_info_hash_del(local, *sta)) {
+ *sta = NULL;
+ return;
}
- while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
- dev_kfree_skb(skb);
+
+ 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)) {
+ BUG_ON(!sdata->bss);
+
+ atomic_dec(&sdata->bss->num_sta_ps);
+ __sta_info_clear_tim_bit(sdata->bss, *sta);
+ }
+
+ local->num_sta--;
+ local->sta_generation++;
+
+ if (local->ops->sta_notify) {
+ if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+ sdata = container_of(sdata->bss,
+ struct ieee80211_sub_if_data,
+ u.ap);
+
+ drv_sta_notify(local, &sdata->vif, STA_NOTIFY_REMOVE,
+ &(*sta)->sta);
+ sdata = (*sta)->sdata;
+ }
+
+ 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",
- local->mdev->name, print_mac(mac, sta->addr));
+ printk(KERN_DEBUG "%s: Removed STA %pM\n",
+ wiphy_name(local->hw.wiphy), (*sta)->sta.addr);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
- ieee80211_key_free(sta->key);
- sta->key = NULL;
+ /*
+ * 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;
+ }
+}
- rate_control_remove_sta_debugfs(sta);
- ieee80211_sta_debugfs_remove(sta);
+void sta_info_unlink(struct sta_info **sta)
+{
+ struct ieee80211_local *local = (*sta)->local;
+ unsigned long flags;
- sta_info_put(sta);
+ 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_packet_data *pkt_data;
+ struct ieee80211_tx_info *info;
int timeout;
if (!skb)
return 0;
- pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
+ 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, pkt_data->jiffies + timeout);
+ return time_after(jiffies, info->control.jiffies + timeout);
}
{
unsigned long flags;
struct sk_buff *skb;
- DECLARE_MAC_BUF(mac);
+ struct ieee80211_sub_if_data *sdata;
if (skb_queue_empty(&sta->ps_tx_buf))
return;
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);
- if (skb_queue_empty(&sta->ps_tx_buf))
- sta->flags &= ~WLAN_STA_TIM;
- } else
+ else
skb = NULL;
spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
- if (skb) {
- local->total_ps_buffered--;
- printk(KERN_DEBUG "Buffered frame expired (STA "
- "%s)\n", print_mac(mac, sta->addr));
- dev_kfree_skb(skb);
- } else
+ if (!skb)
break;
+
+ sdata = sta->sdata;
+ local->total_ps_buffered--;
+#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
+ 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);
}
}
struct ieee80211_local *local = (struct ieee80211_local *) data;
struct sta_info *sta;
- read_lock_bh(&local->sta_lock);
- list_for_each_entry(sta, &local->sta_list, list) {
- __sta_info_get(sta);
+ rcu_read_lock();
+ list_for_each_entry_rcu(sta, &local->sta_list, list)
sta_info_cleanup_expire_buffered(local, sta);
- sta_info_put(sta);
- }
- read_unlock_bh(&local->sta_lock);
+ rcu_read_unlock();
+
+ if (local->quiescing)
+ return;
- local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
+ local->sta_cleanup.expires =
+ round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
add_timer(&local->sta_cleanup);
}
#ifdef CONFIG_MAC80211_DEBUGFS
-static void sta_info_debugfs_add_task(struct work_struct *work)
+/*
+ * 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;
+}
+
+/*
+ * 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;
+
+ 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);
+
+ return ret;
+}
+
+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;
+ /* We need to keep the RTNL across the whole pinned status. */
+ rtnl_lock();
while (1) {
sta = NULL;
- read_lock_bh(&local->sta_lock);
+
+ spin_lock_irqsave(&local->sta_lock, flags);
list_for_each_entry(tmp, &local->sta_list, list) {
- if (!tmp->debugfs.dir) {
+ /*
+ * debugfs.add_has_run will be set by
+ * ieee80211_sta_debugfs_add regardless
+ * of what else it does.
+ */
+ if (!tmp->debugfs.add_has_run) {
sta = tmp;
- __sta_info_get(sta);
+ __sta_info_pin(sta);
break;
}
}
- read_unlock_bh(&local->sta_lock);
+ spin_unlock_irqrestore(&local->sta_lock, flags);
if (!sta)
break;
ieee80211_sta_debugfs_add(sta);
rate_control_add_sta_debugfs(sta);
- sta_info_put(sta);
+
+ sta = __sta_info_unpin(sta);
+ sta_info_destroy(sta);
}
+ rtnl_unlock();
}
#endif
void sta_info_init(struct ieee80211_local *local)
{
- rwlock_init(&local->sta_lock);
+ spin_lock_init(&local->sta_lock);
INIT_LIST_HEAD(&local->sta_list);
- init_timer(&local->sta_cleanup);
- local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
- local->sta_cleanup.data = (unsigned long) local;
- local->sta_cleanup.function = sta_info_cleanup;
+ 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_task);
+ INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work);
#endif
}
void sta_info_stop(struct ieee80211_local *local)
{
del_timer(&local->sta_cleanup);
+#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
+
sta_info_flush(local, NULL);
}
-void sta_info_remove_aid_ptr(struct sta_info *sta)
+/**
+ * sta_info_flush - flush matching STA entries from the STA table
+ *
+ * Returns the number of removed STA entries.
+ *
+ * @local: local interface data
+ * @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;
- if (sta->aid <= 0)
- return;
+ might_sleep();
- sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
+ spin_lock_irqsave(&local->sta_lock, flags);
+ 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++;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&local->sta_lock, flags);
- if (sdata->local->ops->set_tim)
- sdata->local->ops->set_tim(local_to_hw(sdata->local),
- sta->aid, 0);
- if (sdata->bss)
- __bss_tim_clear(sdata->bss, sta->aid);
-}
+ list_for_each_entry_safe(sta, tmp, &tmp_list, list)
+ sta_info_destroy(sta);
+ return ret;
+}
-/**
- * sta_info_flush - flush matching STA entries from the STA table
- * @local: local interface data
- * @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
- */
-void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
+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;
LIST_HEAD(tmp_list);
+ unsigned long flags;
- write_lock_bh(&local->sta_lock);
+ spin_lock_irqsave(&local->sta_lock, flags);
list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
- if (!dev || dev == sta->dev) {
- __sta_info_get(sta);
- sta_info_remove(sta);
- list_add_tail(&sta->list, &tmp_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->dev->name, sta->sta.addr);
+#endif
+ __sta_info_unlink(&sta);
+ if (sta)
+ list_add(&sta->list, &tmp_list);
}
- write_unlock_bh(&local->sta_lock);
+ spin_unlock_irqrestore(&local->sta_lock, flags);
- list_for_each_entry_safe(sta, tmp, &tmp_list, list) {
- sta_info_free(sta);
- sta_info_put(sta);
- }
+ list_for_each_entry_safe(sta, tmp, &tmp_list, list)
+ sta_info_destroy(sta);
+}
+
+struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,
+ const u8 *addr)
+{
+ struct sta_info *sta = sta_info_get(hw_to_local(hw), addr);
+
+ if (!sta)
+ return NULL;
+ return &sta->sta;
}
+EXPORT_SYMBOL(ieee80211_find_sta);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff