2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/etherdevice.h>
13 #include <linux/netdevice.h>
14 #include <linux/types.h>
15 #include <linux/slab.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/timer.h>
19 #include <linux/rtnetlink.h>
21 #include <net/mac80211.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
26 #include "debugfs_sta.h"
31 * DOC: STA information lifetime rules
33 * STA info structures (&struct sta_info) are managed in a hash table
34 * for faster lookup and a list for iteration. They are managed using
35 * RCU, i.e. access to the list and hash table is protected by RCU.
37 * Upon allocating a STA info structure with sta_info_alloc(), the caller
38 * owns that structure. It must then insert it into the hash table using
39 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
40 * case (which acquires an rcu read section but must not be called from
41 * within one) will the pointer still be valid after the call. Note that
42 * the caller may not do much with the STA info before inserting it, in
43 * particular, it may not start any mesh peer link management or add
46 * When the insertion fails (sta_info_insert()) returns non-zero), the
47 * structure will have been freed by sta_info_insert()!
49 * Station entries are added by mac80211 when you establish a link with a
50 * peer. This means different things for the different type of interfaces
51 * we support. For a regular station this mean we add the AP sta when we
52 * receive an association response from the AP. For IBSS this occurs when
53 * get to know about a peer on the same IBSS. For WDS we add the sta for
54 * the peer immediately upon device open. When using AP mode we add stations
55 * for each respective station upon request from userspace through nl80211.
57 * In order to remove a STA info structure, various sta_info_destroy_*()
58 * calls are available.
60 * There is no concept of ownership on a STA entry, each structure is
61 * owned by the global hash table/list until it is removed. All users of
62 * the structure need to be RCU protected so that the structure won't be
63 * freed before they are done using it.
66 /* Caller must hold local->sta_mtx */
67 static int sta_info_hash_del(struct ieee80211_local *local,
72 s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
73 lockdep_is_held(&local->sta_mtx));
77 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
82 while (rcu_access_pointer(s->hnext) &&
83 rcu_access_pointer(s->hnext) != sta)
84 s = rcu_dereference_protected(s->hnext,
85 lockdep_is_held(&local->sta_mtx));
86 if (rcu_access_pointer(s->hnext)) {
87 rcu_assign_pointer(s->hnext, sta->hnext);
94 static void cleanup_single_sta(struct sta_info *sta)
97 struct tid_ampdu_tx *tid_tx;
98 struct ieee80211_sub_if_data *sdata = sta->sdata;
99 struct ieee80211_local *local = sdata->local;
103 * At this point, when being called as call_rcu callback,
104 * neither mac80211 nor the driver can reference this
105 * sta struct any more except by still existing timers
106 * associated with this station that we clean up below.
108 * Note though that this still uses the sdata and even
109 * calls the driver in AP and mesh mode, so interfaces
110 * of those types mush use call sta_info_flush_cleanup()
111 * (typically via sta_info_flush()) before deconfiguring
114 * In station mode, nothing happens here so it doesn't
115 * have to (and doesn't) do that, this is intentional to
119 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
120 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
121 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
122 ps = &sdata->bss->ps;
123 else if (ieee80211_vif_is_mesh(&sdata->vif))
124 ps = &sdata->u.mesh.ps;
128 clear_sta_flag(sta, WLAN_STA_PS_STA);
130 atomic_dec(&ps->num_sta_ps);
131 sta_info_recalc_tim(sta);
134 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
135 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
136 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
137 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
140 if (ieee80211_vif_is_mesh(&sdata->vif))
141 mesh_sta_cleanup(sta);
143 cancel_work_sync(&sta->drv_unblock_wk);
146 * Destroy aggregation state here. It would be nice to wait for the
147 * driver to finish aggregation stop and then clean up, but for now
148 * drivers have to handle aggregation stop being requested, followed
149 * directly by station destruction.
151 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
152 kfree(sta->ampdu_mlme.tid_start_tx[i]);
153 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
156 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
160 sta_info_free(local, sta);
163 void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data *sdata)
165 struct sta_info *sta;
167 spin_lock_bh(&sdata->cleanup_stations_lock);
168 while (!list_empty(&sdata->cleanup_stations)) {
169 sta = list_first_entry(&sdata->cleanup_stations,
170 struct sta_info, list);
171 list_del(&sta->list);
172 spin_unlock_bh(&sdata->cleanup_stations_lock);
174 cleanup_single_sta(sta);
176 spin_lock_bh(&sdata->cleanup_stations_lock);
179 spin_unlock_bh(&sdata->cleanup_stations_lock);
182 static void free_sta_rcu(struct rcu_head *h)
184 struct sta_info *sta = container_of(h, struct sta_info, rcu_head);
185 struct ieee80211_sub_if_data *sdata = sta->sdata;
187 spin_lock(&sdata->cleanup_stations_lock);
188 list_add_tail(&sta->list, &sdata->cleanup_stations);
189 spin_unlock(&sdata->cleanup_stations_lock);
191 ieee80211_queue_work(&sdata->local->hw, &sdata->cleanup_stations_wk);
194 /* protected by RCU */
195 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
198 struct ieee80211_local *local = sdata->local;
199 struct sta_info *sta;
201 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
202 lockdep_is_held(&local->sta_mtx));
204 if (sta->sdata == sdata &&
205 ether_addr_equal(sta->sta.addr, addr))
207 sta = rcu_dereference_check(sta->hnext,
208 lockdep_is_held(&local->sta_mtx));
214 * Get sta info either from the specified interface
215 * or from one of its vlans
217 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
220 struct ieee80211_local *local = sdata->local;
221 struct sta_info *sta;
223 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
224 lockdep_is_held(&local->sta_mtx));
226 if ((sta->sdata == sdata ||
227 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
228 ether_addr_equal(sta->sta.addr, addr))
230 sta = rcu_dereference_check(sta->hnext,
231 lockdep_is_held(&local->sta_mtx));
236 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
239 struct ieee80211_local *local = sdata->local;
240 struct sta_info *sta;
243 list_for_each_entry_rcu(sta, &local->sta_list, list) {
244 if (sdata != sta->sdata)
257 * sta_info_free - free STA
259 * @local: pointer to the global information
260 * @sta: STA info to free
262 * This function must undo everything done by sta_info_alloc()
263 * that may happen before sta_info_insert(). It may only be
264 * called when sta_info_insert() has not been attempted (and
265 * if that fails, the station is freed anyway.)
267 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
272 rate_control_free_sta(sta);
275 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
276 kfree(sta->tx_lat[i].bins);
280 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
285 /* Caller must hold local->sta_mtx */
286 static void sta_info_hash_add(struct ieee80211_local *local,
287 struct sta_info *sta)
289 lockdep_assert_held(&local->sta_mtx);
290 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
291 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
294 static void sta_unblock(struct work_struct *wk)
296 struct sta_info *sta;
298 sta = container_of(wk, struct sta_info, drv_unblock_wk);
303 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
305 ieee80211_sta_ps_deliver_wakeup(sta);
307 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
308 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
311 ieee80211_sta_ps_deliver_poll_response(sta);
313 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
314 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
317 ieee80211_sta_ps_deliver_uapsd(sta);
320 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
323 static int sta_prepare_rate_control(struct ieee80211_local *local,
324 struct sta_info *sta, gfp_t gfp)
326 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
329 sta->rate_ctrl = local->rate_ctrl;
330 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
332 if (!sta->rate_ctrl_priv)
338 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
339 const u8 *addr, gfp_t gfp)
341 struct ieee80211_local *local = sdata->local;
342 struct sta_info *sta;
343 struct timespec uptime;
344 struct ieee80211_tx_latency_bin_ranges *tx_latency;
347 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
351 spin_lock_init(&sta->lock);
352 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
353 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
354 mutex_init(&sta->ampdu_mlme.mtx);
355 #ifdef CONFIG_MAC80211_MESH
356 if (ieee80211_vif_is_mesh(&sdata->vif) &&
357 !sdata->u.mesh.user_mpm)
358 init_timer(&sta->plink_timer);
359 sta->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
362 memcpy(sta->sta.addr, addr, ETH_ALEN);
365 sta->last_rx = jiffies;
367 sta->sta_state = IEEE80211_STA_NONE;
369 do_posix_clock_monotonic_gettime(&uptime);
370 sta->last_connected = uptime.tv_sec;
371 ewma_init(&sta->avg_signal, 1024, 8);
372 for (i = 0; i < ARRAY_SIZE(sta->chain_signal_avg); i++)
373 ewma_init(&sta->chain_signal_avg[i], 1024, 8);
375 if (sta_prepare_rate_control(local, sta, gfp)) {
380 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
382 * timer_to_tid must be initialized with identity mapping
383 * to enable session_timer's data differentiation. See
384 * sta_rx_agg_session_timer_expired for usage.
386 sta->timer_to_tid[i] = i;
388 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
389 skb_queue_head_init(&sta->ps_tx_buf[i]);
390 skb_queue_head_init(&sta->tx_filtered[i]);
393 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
394 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
396 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
397 if (sdata->vif.type == NL80211_IFTYPE_AP ||
398 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
399 struct ieee80211_supported_band *sband =
400 local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
401 u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
402 IEEE80211_HT_CAP_SM_PS_SHIFT;
404 * Assume that hostapd advertises our caps in the beacon and
405 * this is the known_smps_mode for a station that just assciated
408 case WLAN_HT_SMPS_CONTROL_DISABLED:
409 sta->known_smps_mode = IEEE80211_SMPS_OFF;
411 case WLAN_HT_SMPS_CONTROL_STATIC:
412 sta->known_smps_mode = IEEE80211_SMPS_STATIC;
414 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
415 sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
424 tx_latency = rcu_dereference(local->tx_latency);
425 /* init stations Tx latency statistics && TID bins */
427 sta->tx_lat = kzalloc(IEEE80211_NUM_TIDS *
428 sizeof(struct ieee80211_tx_latency_stat),
432 * if Tx latency and bins are enabled and the previous allocation
435 if (tx_latency && tx_latency->n_ranges && sta->tx_lat)
436 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
437 /* size of bins is size of the ranges +1 */
438 sta->tx_lat[i].bin_count =
439 tx_latency->n_ranges + 1;
440 sta->tx_lat[i].bins = kcalloc(sta->tx_lat[i].bin_count,
447 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
452 static int sta_info_insert_check(struct sta_info *sta)
454 struct ieee80211_sub_if_data *sdata = sta->sdata;
457 * Can't be a WARN_ON because it can be triggered through a race:
458 * something inserts a STA (on one CPU) without holding the RTNL
459 * and another CPU turns off the net device.
461 if (unlikely(!ieee80211_sdata_running(sdata)))
464 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
465 is_multicast_ether_addr(sta->sta.addr)))
471 static int sta_info_insert_drv_state(struct ieee80211_local *local,
472 struct ieee80211_sub_if_data *sdata,
473 struct sta_info *sta)
475 enum ieee80211_sta_state state;
478 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
479 err = drv_sta_state(local, sdata, sta, state, state + 1);
486 * Drivers using legacy sta_add/sta_remove callbacks only
487 * get uploaded set to true after sta_add is called.
489 if (!local->ops->sta_add)
490 sta->uploaded = true;
494 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
496 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
497 sta->sta.addr, state + 1, err);
501 /* unwind on error */
502 for (; state > IEEE80211_STA_NOTEXIST; state--)
503 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
509 * should be called with sta_mtx locked
510 * this function replaces the mutex lock
513 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
515 struct ieee80211_local *local = sta->local;
516 struct ieee80211_sub_if_data *sdata = sta->sdata;
517 struct station_info sinfo;
520 lockdep_assert_held(&local->sta_mtx);
522 /* check if STA exists already */
523 if (sta_info_get_bss(sdata, sta->sta.addr)) {
529 err = sta_info_insert_drv_state(local, sdata, sta);
534 local->sta_generation++;
537 /* make the station visible */
538 sta_info_hash_add(local, sta);
540 list_add_rcu(&sta->list, &local->sta_list);
542 set_sta_flag(sta, WLAN_STA_INSERTED);
544 ieee80211_recalc_min_chandef(sdata);
545 ieee80211_sta_debugfs_add(sta);
546 rate_control_add_sta_debugfs(sta);
548 memset(&sinfo, 0, sizeof(sinfo));
550 sinfo.generation = local->sta_generation;
551 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
553 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
555 /* move reference to rcu-protected */
557 mutex_unlock(&local->sta_mtx);
559 if (ieee80211_vif_is_mesh(&sdata->vif))
560 mesh_accept_plinks_update(sdata);
564 mutex_unlock(&local->sta_mtx);
569 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
571 struct ieee80211_local *local = sta->local;
576 err = sta_info_insert_check(sta);
582 mutex_lock(&local->sta_mtx);
584 err = sta_info_insert_finish(sta);
591 sta_info_free(local, sta);
595 int sta_info_insert(struct sta_info *sta)
597 int err = sta_info_insert_rcu(sta);
604 static inline void __bss_tim_set(u8 *tim, u16 id)
607 * This format has been mandated by the IEEE specifications,
608 * so this line may not be changed to use the __set_bit() format.
610 tim[id / 8] |= (1 << (id % 8));
613 static inline void __bss_tim_clear(u8 *tim, u16 id)
616 * This format has been mandated by the IEEE specifications,
617 * so this line may not be changed to use the __clear_bit() format.
619 tim[id / 8] &= ~(1 << (id % 8));
622 static inline bool __bss_tim_get(u8 *tim, u16 id)
625 * This format has been mandated by the IEEE specifications,
626 * so this line may not be changed to use the test_bit() format.
628 return tim[id / 8] & (1 << (id % 8));
631 static unsigned long ieee80211_tids_for_ac(int ac)
633 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
635 case IEEE80211_AC_VO:
636 return BIT(6) | BIT(7);
637 case IEEE80211_AC_VI:
638 return BIT(4) | BIT(5);
639 case IEEE80211_AC_BE:
640 return BIT(0) | BIT(3);
641 case IEEE80211_AC_BK:
642 return BIT(1) | BIT(2);
649 void sta_info_recalc_tim(struct sta_info *sta)
651 struct ieee80211_local *local = sta->local;
653 bool indicate_tim = false;
654 u8 ignore_for_tim = sta->sta.uapsd_queues;
658 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
659 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
660 if (WARN_ON_ONCE(!sta->sdata->bss))
663 ps = &sta->sdata->bss->ps;
665 #ifdef CONFIG_MAC80211_MESH
666 } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
667 ps = &sta->sdata->u.mesh.ps;
668 /* TIM map only for 1 <= PLID <= IEEE80211_MAX_AID */
669 id = sta->plid % (IEEE80211_MAX_AID + 1);
675 /* No need to do anything if the driver does all */
676 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
683 * If all ACs are delivery-enabled then we should build
684 * the TIM bit for all ACs anyway; if only some are then
685 * we ignore those and build the TIM bit using only the
688 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
691 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
694 if (ignore_for_tim & BIT(ac))
697 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
698 !skb_queue_empty(&sta->ps_tx_buf[ac]);
702 tids = ieee80211_tids_for_ac(ac);
705 sta->driver_buffered_tids & tids;
709 spin_lock_bh(&local->tim_lock);
711 if (indicate_tim == __bss_tim_get(ps->tim, id))
715 __bss_tim_set(ps->tim, id);
717 __bss_tim_clear(ps->tim, id);
719 if (local->ops->set_tim) {
720 local->tim_in_locked_section = true;
721 drv_set_tim(local, &sta->sta, indicate_tim);
722 local->tim_in_locked_section = false;
726 spin_unlock_bh(&local->tim_lock);
729 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
731 struct ieee80211_tx_info *info;
737 info = IEEE80211_SKB_CB(skb);
739 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
740 timeout = (sta->listen_interval *
741 sta->sdata->vif.bss_conf.beacon_int *
743 if (timeout < STA_TX_BUFFER_EXPIRE)
744 timeout = STA_TX_BUFFER_EXPIRE;
745 return time_after(jiffies, info->control.jiffies + timeout);
749 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
750 struct sta_info *sta, int ac)
756 * First check for frames that should expire on the filtered
757 * queue. Frames here were rejected by the driver and are on
758 * a separate queue to avoid reordering with normal PS-buffered
759 * frames. They also aren't accounted for right now in the
760 * total_ps_buffered counter.
763 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
764 skb = skb_peek(&sta->tx_filtered[ac]);
765 if (sta_info_buffer_expired(sta, skb))
766 skb = __skb_dequeue(&sta->tx_filtered[ac]);
769 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
772 * Frames are queued in order, so if this one
773 * hasn't expired yet we can stop testing. If
774 * we actually reached the end of the queue we
775 * also need to stop, of course.
779 ieee80211_free_txskb(&local->hw, skb);
783 * Now also check the normal PS-buffered queue, this will
784 * only find something if the filtered queue was emptied
785 * since the filtered frames are all before the normal PS
789 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
790 skb = skb_peek(&sta->ps_tx_buf[ac]);
791 if (sta_info_buffer_expired(sta, skb))
792 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
795 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
798 * frames are queued in order, so if this one
799 * hasn't expired yet (or we reached the end of
800 * the queue) we can stop testing
805 local->total_ps_buffered--;
806 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
808 ieee80211_free_txskb(&local->hw, skb);
812 * Finally, recalculate the TIM bit for this station -- it might
813 * now be clear because the station was too slow to retrieve its
816 sta_info_recalc_tim(sta);
819 * Return whether there are any frames still buffered, this is
820 * used to check whether the cleanup timer still needs to run,
821 * if there are no frames we don't need to rearm the timer.
823 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
824 skb_queue_empty(&sta->tx_filtered[ac]));
827 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
828 struct sta_info *sta)
830 bool have_buffered = false;
833 /* This is only necessary for stations on BSS/MBSS interfaces */
834 if (!sta->sdata->bss &&
835 !ieee80211_vif_is_mesh(&sta->sdata->vif))
838 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
840 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
842 return have_buffered;
845 int __must_check __sta_info_destroy(struct sta_info *sta)
847 struct ieee80211_local *local;
848 struct ieee80211_sub_if_data *sdata;
859 lockdep_assert_held(&local->sta_mtx);
862 * Before removing the station from the driver and
863 * rate control, it might still start new aggregation
864 * sessions -- block that to make sure the tear-down
865 * will be sufficient.
867 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
868 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
870 ret = sta_info_hash_del(local, sta);
874 list_del_rcu(&sta->list);
876 /* this always calls synchronize_net() */
877 ieee80211_free_sta_keys(local, sta);
882 local->sta_generation++;
884 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
885 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
887 while (sta->sta_state > IEEE80211_STA_NONE) {
888 ret = sta_info_move_state(sta, sta->sta_state - 1);
896 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
897 IEEE80211_STA_NOTEXIST);
898 WARN_ON_ONCE(ret != 0);
901 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
903 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
905 rate_control_remove_sta_debugfs(sta);
906 ieee80211_sta_debugfs_remove(sta);
907 ieee80211_recalc_min_chandef(sdata);
909 call_rcu(&sta->rcu_head, free_sta_rcu);
914 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
916 struct sta_info *sta;
919 mutex_lock(&sdata->local->sta_mtx);
920 sta = sta_info_get(sdata, addr);
921 ret = __sta_info_destroy(sta);
922 mutex_unlock(&sdata->local->sta_mtx);
927 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
930 struct sta_info *sta;
933 mutex_lock(&sdata->local->sta_mtx);
934 sta = sta_info_get_bss(sdata, addr);
935 ret = __sta_info_destroy(sta);
936 mutex_unlock(&sdata->local->sta_mtx);
941 static void sta_info_cleanup(unsigned long data)
943 struct ieee80211_local *local = (struct ieee80211_local *) data;
944 struct sta_info *sta;
945 bool timer_needed = false;
948 list_for_each_entry_rcu(sta, &local->sta_list, list)
949 if (sta_info_cleanup_expire_buffered(local, sta))
953 if (local->quiescing)
959 mod_timer(&local->sta_cleanup,
960 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
963 void sta_info_init(struct ieee80211_local *local)
965 spin_lock_init(&local->tim_lock);
966 mutex_init(&local->sta_mtx);
967 INIT_LIST_HEAD(&local->sta_list);
969 setup_timer(&local->sta_cleanup, sta_info_cleanup,
970 (unsigned long)local);
973 void sta_info_stop(struct ieee80211_local *local)
975 del_timer_sync(&local->sta_cleanup);
979 int sta_info_flush_defer(struct ieee80211_sub_if_data *sdata)
981 struct ieee80211_local *local = sdata->local;
982 struct sta_info *sta, *tmp;
987 mutex_lock(&local->sta_mtx);
988 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
989 if (sdata == sta->sdata) {
990 WARN_ON(__sta_info_destroy(sta));
994 mutex_unlock(&local->sta_mtx);
999 void sta_info_flush_cleanup(struct ieee80211_sub_if_data *sdata)
1001 ieee80211_cleanup_sdata_stas(sdata);
1002 cancel_work_sync(&sdata->cleanup_stations_wk);
1005 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1006 unsigned long exp_time)
1008 struct ieee80211_local *local = sdata->local;
1009 struct sta_info *sta, *tmp;
1011 mutex_lock(&local->sta_mtx);
1013 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1014 if (sdata != sta->sdata)
1017 if (time_after(jiffies, sta->last_rx + exp_time)) {
1018 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1021 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1022 test_sta_flag(sta, WLAN_STA_PS_STA))
1023 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1025 WARN_ON(__sta_info_destroy(sta));
1029 mutex_unlock(&local->sta_mtx);
1032 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1034 const u8 *localaddr)
1036 struct sta_info *sta, *nxt;
1039 * Just return a random station if localaddr is NULL
1040 * ... first in list.
1042 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
1044 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1053 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1055 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1058 struct sta_info *sta;
1063 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1072 EXPORT_SYMBOL(ieee80211_find_sta);
1074 static void clear_sta_ps_flags(void *_sta)
1076 struct sta_info *sta = _sta;
1077 struct ieee80211_sub_if_data *sdata = sta->sdata;
1080 if (sdata->vif.type == NL80211_IFTYPE_AP ||
1081 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1082 ps = &sdata->bss->ps;
1083 else if (ieee80211_vif_is_mesh(&sdata->vif))
1084 ps = &sdata->u.mesh.ps;
1088 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1089 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
1090 atomic_dec(&ps->num_sta_ps);
1093 /* powersave support code */
1094 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1096 struct ieee80211_sub_if_data *sdata = sta->sdata;
1097 struct ieee80211_local *local = sdata->local;
1098 struct sk_buff_head pending;
1099 int filtered = 0, buffered = 0, ac;
1100 unsigned long flags;
1102 clear_sta_flag(sta, WLAN_STA_SP);
1104 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1105 sta->driver_buffered_tids = 0;
1107 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1108 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1110 skb_queue_head_init(&pending);
1112 /* Send all buffered frames to the station */
1113 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1114 int count = skb_queue_len(&pending), tmp;
1116 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1117 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1118 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1119 tmp = skb_queue_len(&pending);
1120 filtered += tmp - count;
1123 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1124 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1125 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1126 tmp = skb_queue_len(&pending);
1127 buffered += tmp - count;
1130 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
1132 /* This station just woke up and isn't aware of our SMPS state */
1133 if (!ieee80211_smps_is_restrictive(sta->known_smps_mode,
1134 sdata->smps_mode) &&
1135 sta->known_smps_mode != sdata->bss->req_smps &&
1136 sta_info_tx_streams(sta) != 1) {
1138 "%pM just woke up and MIMO capable - update SMPS\n",
1140 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1142 sdata->vif.bss_conf.bssid);
1145 local->total_ps_buffered -= buffered;
1147 sta_info_recalc_tim(sta);
1150 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1151 sta->sta.addr, sta->sta.aid, filtered, buffered);
1154 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1155 struct sta_info *sta, int tid,
1156 enum ieee80211_frame_release_type reason)
1158 struct ieee80211_local *local = sdata->local;
1159 struct ieee80211_qos_hdr *nullfunc;
1160 struct sk_buff *skb;
1161 int size = sizeof(*nullfunc);
1163 bool qos = test_sta_flag(sta, WLAN_STA_WME);
1164 struct ieee80211_tx_info *info;
1165 struct ieee80211_chanctx_conf *chanctx_conf;
1168 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1169 IEEE80211_STYPE_QOS_NULLFUNC |
1170 IEEE80211_FCTL_FROMDS);
1173 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1174 IEEE80211_STYPE_NULLFUNC |
1175 IEEE80211_FCTL_FROMDS);
1178 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1182 skb_reserve(skb, local->hw.extra_tx_headroom);
1184 nullfunc = (void *) skb_put(skb, size);
1185 nullfunc->frame_control = fc;
1186 nullfunc->duration_id = 0;
1187 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1188 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1189 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1191 skb->priority = tid;
1192 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1194 nullfunc->qos_ctrl = cpu_to_le16(tid);
1196 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1197 nullfunc->qos_ctrl |=
1198 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1201 info = IEEE80211_SKB_CB(skb);
1204 * Tell TX path to send this frame even though the
1205 * STA may still remain is PS mode after this frame
1206 * exchange. Also set EOSP to indicate this packet
1207 * ends the poll/service period.
1209 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1210 IEEE80211_TX_CTL_PS_RESPONSE |
1211 IEEE80211_TX_STATUS_EOSP |
1212 IEEE80211_TX_CTL_REQ_TX_STATUS;
1214 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1216 skb->dev = sdata->dev;
1219 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1220 if (WARN_ON(!chanctx_conf)) {
1226 ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band);
1231 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1232 int n_frames, u8 ignored_acs,
1233 enum ieee80211_frame_release_type reason)
1235 struct ieee80211_sub_if_data *sdata = sta->sdata;
1236 struct ieee80211_local *local = sdata->local;
1238 bool more_data = false;
1240 unsigned long driver_release_tids = 0;
1241 struct sk_buff_head frames;
1243 /* Service or PS-Poll period starts */
1244 set_sta_flag(sta, WLAN_STA_SP);
1246 __skb_queue_head_init(&frames);
1249 * Get response frame(s) and more data bit for it.
1251 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1254 if (ignored_acs & BIT(ac))
1257 tids = ieee80211_tids_for_ac(ac);
1260 driver_release_tids = sta->driver_buffered_tids & tids;
1261 if (driver_release_tids) {
1264 struct sk_buff *skb;
1266 while (n_frames > 0) {
1267 skb = skb_dequeue(&sta->tx_filtered[ac]);
1270 &sta->ps_tx_buf[ac]);
1272 local->total_ps_buffered--;
1278 __skb_queue_tail(&frames, skb);
1283 * If the driver has data on more than one TID then
1284 * certainly there's more data if we release just a
1285 * single frame now (from a single TID).
1287 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1288 hweight16(driver_release_tids) > 1) {
1290 driver_release_tids =
1291 BIT(ffs(driver_release_tids) - 1);
1296 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1297 !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1307 * For PS-Poll, this can only happen due to a race condition
1308 * when we set the TIM bit and the station notices it, but
1309 * before it can poll for the frame we expire it.
1311 * For uAPSD, this is said in the standard (11.2.1.5 h):
1312 * At each unscheduled SP for a non-AP STA, the AP shall
1313 * attempt to transmit at least one MSDU or MMPDU, but no
1314 * more than the value specified in the Max SP Length field
1315 * in the QoS Capability element from delivery-enabled ACs,
1316 * that are destined for the non-AP STA.
1318 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1321 /* This will evaluate to 1, 3, 5 or 7. */
1322 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1324 ieee80211_send_null_response(sdata, sta, tid, reason);
1328 if (!driver_release_tids) {
1329 struct sk_buff_head pending;
1330 struct sk_buff *skb;
1334 skb_queue_head_init(&pending);
1336 while ((skb = __skb_dequeue(&frames))) {
1337 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1338 struct ieee80211_hdr *hdr = (void *) skb->data;
1344 * Tell TX path to send this frame even though the
1345 * STA may still remain is PS mode after this frame
1348 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1349 IEEE80211_TX_CTL_PS_RESPONSE;
1352 * Use MoreData flag to indicate whether there are
1353 * more buffered frames for this STA
1355 if (more_data || !skb_queue_empty(&frames))
1356 hdr->frame_control |=
1357 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1359 hdr->frame_control &=
1360 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1362 if (ieee80211_is_data_qos(hdr->frame_control) ||
1363 ieee80211_is_qos_nullfunc(hdr->frame_control))
1364 qoshdr = ieee80211_get_qos_ctl(hdr);
1366 /* end service period after last frame */
1367 if (skb_queue_empty(&frames)) {
1368 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1370 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1372 info->flags |= IEEE80211_TX_STATUS_EOSP |
1373 IEEE80211_TX_CTL_REQ_TX_STATUS;
1377 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1381 __skb_queue_tail(&pending, skb);
1384 drv_allow_buffered_frames(local, sta, tids, num,
1387 ieee80211_add_pending_skbs(local, &pending);
1389 sta_info_recalc_tim(sta);
1392 * We need to release a frame that is buffered somewhere in the
1393 * driver ... it'll have to handle that.
1394 * Note that, as per the comment above, it'll also have to see
1395 * if there is more than just one frame on the specific TID that
1396 * we're releasing from, and it needs to set the more-data bit
1397 * accordingly if we tell it that there's no more data. If we do
1398 * tell it there's more data, then of course the more-data bit
1399 * needs to be set anyway.
1401 drv_release_buffered_frames(local, sta, driver_release_tids,
1402 n_frames, reason, more_data);
1405 * Note that we don't recalculate the TIM bit here as it would
1406 * most likely have no effect at all unless the driver told us
1407 * that the TID became empty before returning here from the
1409 * Either way, however, when the driver tells us that the TID
1410 * became empty we'll do the TIM recalculation.
1415 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1417 u8 ignore_for_response = sta->sta.uapsd_queues;
1420 * If all ACs are delivery-enabled then we should reply
1421 * from any of them, if only some are enabled we reply
1422 * only from the non-enabled ones.
1424 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1425 ignore_for_response = 0;
1427 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1428 IEEE80211_FRAME_RELEASE_PSPOLL);
1431 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1433 int n_frames = sta->sta.max_sp;
1434 u8 delivery_enabled = sta->sta.uapsd_queues;
1437 * If we ever grow support for TSPEC this might happen if
1438 * the TSPEC update from hostapd comes in between a trigger
1439 * frame setting WLAN_STA_UAPSD in the RX path and this
1440 * actually getting called.
1442 if (!delivery_enabled)
1445 switch (sta->sta.max_sp) {
1456 /* XXX: what is a good value? */
1461 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1462 IEEE80211_FRAME_RELEASE_UAPSD);
1465 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1466 struct ieee80211_sta *pubsta, bool block)
1468 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1470 trace_api_sta_block_awake(sta->local, pubsta, block);
1473 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1474 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1475 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1477 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1479 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1481 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1482 struct ieee80211_local *local = sta->local;
1484 trace_api_eosp(local, pubsta);
1486 clear_sta_flag(sta, WLAN_STA_SP);
1488 EXPORT_SYMBOL(ieee80211_sta_eosp);
1490 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1491 u8 tid, bool buffered)
1493 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1495 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1499 set_bit(tid, &sta->driver_buffered_tids);
1501 clear_bit(tid, &sta->driver_buffered_tids);
1503 sta_info_recalc_tim(sta);
1505 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1507 int sta_info_move_state(struct sta_info *sta,
1508 enum ieee80211_sta_state new_state)
1512 if (sta->sta_state == new_state)
1515 /* check allowed transitions first */
1517 switch (new_state) {
1518 case IEEE80211_STA_NONE:
1519 if (sta->sta_state != IEEE80211_STA_AUTH)
1522 case IEEE80211_STA_AUTH:
1523 if (sta->sta_state != IEEE80211_STA_NONE &&
1524 sta->sta_state != IEEE80211_STA_ASSOC)
1527 case IEEE80211_STA_ASSOC:
1528 if (sta->sta_state != IEEE80211_STA_AUTH &&
1529 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1532 case IEEE80211_STA_AUTHORIZED:
1533 if (sta->sta_state != IEEE80211_STA_ASSOC)
1537 WARN(1, "invalid state %d", new_state);
1541 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1542 sta->sta.addr, new_state);
1545 * notify the driver before the actual changes so it can
1546 * fail the transition
1548 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1549 int err = drv_sta_state(sta->local, sta->sdata, sta,
1550 sta->sta_state, new_state);
1555 /* reflect the change in all state variables */
1557 switch (new_state) {
1558 case IEEE80211_STA_NONE:
1559 if (sta->sta_state == IEEE80211_STA_AUTH)
1560 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1562 case IEEE80211_STA_AUTH:
1563 if (sta->sta_state == IEEE80211_STA_NONE)
1564 set_bit(WLAN_STA_AUTH, &sta->_flags);
1565 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1566 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1568 case IEEE80211_STA_ASSOC:
1569 if (sta->sta_state == IEEE80211_STA_AUTH) {
1570 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1571 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1572 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1573 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1574 !sta->sdata->u.vlan.sta))
1575 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1576 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1579 case IEEE80211_STA_AUTHORIZED:
1580 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1581 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1582 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1583 !sta->sdata->u.vlan.sta))
1584 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1585 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1592 sta->sta_state = new_state;
1597 u8 sta_info_tx_streams(struct sta_info *sta)
1599 struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1602 if (!sta->sta.ht_cap.ht_supported)
1605 if (sta->sta.vht_cap.vht_supported) {
1608 le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1610 for (i = 7; i >= 0; i--)
1611 if ((tx_mcs_map & (0x3 << (i * 2))) !=
1612 IEEE80211_VHT_MCS_NOT_SUPPORTED)
1616 if (ht_cap->mcs.rx_mask[3])
1618 else if (ht_cap->mcs.rx_mask[2])
1620 else if (ht_cap->mcs.rx_mask[1])
1625 if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1628 return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1629 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;