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;
102 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
103 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
104 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
105 ps = &sdata->bss->ps;
106 else if (ieee80211_vif_is_mesh(&sdata->vif))
107 ps = &sdata->u.mesh.ps;
111 clear_sta_flag(sta, WLAN_STA_PS_STA);
113 atomic_dec(&ps->num_sta_ps);
114 sta_info_recalc_tim(sta);
117 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
118 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
119 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
120 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
123 if (ieee80211_vif_is_mesh(&sdata->vif))
124 mesh_sta_cleanup(sta);
126 cancel_work_sync(&sta->drv_unblock_wk);
129 * Destroy aggregation state here. It would be nice to wait for the
130 * driver to finish aggregation stop and then clean up, but for now
131 * drivers have to handle aggregation stop being requested, followed
132 * directly by station destruction.
134 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
135 kfree(sta->ampdu_mlme.tid_start_tx[i]);
136 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
139 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
143 sta_info_free(local, sta);
146 /* protected by RCU */
147 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
150 struct ieee80211_local *local = sdata->local;
151 struct sta_info *sta;
153 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
154 lockdep_is_held(&local->sta_mtx));
156 if (sta->sdata == sdata &&
157 ether_addr_equal(sta->sta.addr, addr))
159 sta = rcu_dereference_check(sta->hnext,
160 lockdep_is_held(&local->sta_mtx));
166 * Get sta info either from the specified interface
167 * or from one of its vlans
169 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
172 struct ieee80211_local *local = sdata->local;
173 struct sta_info *sta;
175 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
176 lockdep_is_held(&local->sta_mtx));
178 if ((sta->sdata == sdata ||
179 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
180 ether_addr_equal(sta->sta.addr, addr))
182 sta = rcu_dereference_check(sta->hnext,
183 lockdep_is_held(&local->sta_mtx));
188 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
191 struct ieee80211_local *local = sdata->local;
192 struct sta_info *sta;
195 list_for_each_entry_rcu(sta, &local->sta_list, list) {
196 if (sdata != sta->sdata)
209 * sta_info_free - free STA
211 * @local: pointer to the global information
212 * @sta: STA info to free
214 * This function must undo everything done by sta_info_alloc()
215 * that may happen before sta_info_insert(). It may only be
216 * called when sta_info_insert() has not been attempted (and
217 * if that fails, the station is freed anyway.)
219 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
224 rate_control_free_sta(sta);
227 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
228 kfree(sta->tx_lat[i].bins);
232 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
237 /* Caller must hold local->sta_mtx */
238 static void sta_info_hash_add(struct ieee80211_local *local,
239 struct sta_info *sta)
241 lockdep_assert_held(&local->sta_mtx);
242 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
243 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
246 static void sta_unblock(struct work_struct *wk)
248 struct sta_info *sta;
250 sta = container_of(wk, struct sta_info, drv_unblock_wk);
255 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
257 ieee80211_sta_ps_deliver_wakeup(sta);
259 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
260 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
263 ieee80211_sta_ps_deliver_poll_response(sta);
265 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
266 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
269 ieee80211_sta_ps_deliver_uapsd(sta);
272 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
275 static int sta_prepare_rate_control(struct ieee80211_local *local,
276 struct sta_info *sta, gfp_t gfp)
278 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
281 sta->rate_ctrl = local->rate_ctrl;
282 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
284 if (!sta->rate_ctrl_priv)
290 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
291 const u8 *addr, gfp_t gfp)
293 struct ieee80211_local *local = sdata->local;
294 struct sta_info *sta;
295 struct timespec uptime;
296 struct ieee80211_tx_latency_bin_ranges *tx_latency;
299 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
303 spin_lock_init(&sta->lock);
304 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
305 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
306 mutex_init(&sta->ampdu_mlme.mtx);
307 #ifdef CONFIG_MAC80211_MESH
308 if (ieee80211_vif_is_mesh(&sdata->vif) &&
309 !sdata->u.mesh.user_mpm)
310 init_timer(&sta->plink_timer);
311 sta->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
314 memcpy(sta->sta.addr, addr, ETH_ALEN);
317 sta->last_rx = jiffies;
319 sta->sta_state = IEEE80211_STA_NONE;
321 do_posix_clock_monotonic_gettime(&uptime);
322 sta->last_connected = uptime.tv_sec;
323 ewma_init(&sta->avg_signal, 1024, 8);
324 for (i = 0; i < ARRAY_SIZE(sta->chain_signal_avg); i++)
325 ewma_init(&sta->chain_signal_avg[i], 1024, 8);
327 if (sta_prepare_rate_control(local, sta, gfp)) {
332 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
334 * timer_to_tid must be initialized with identity mapping
335 * to enable session_timer's data differentiation. See
336 * sta_rx_agg_session_timer_expired for usage.
338 sta->timer_to_tid[i] = i;
340 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
341 skb_queue_head_init(&sta->ps_tx_buf[i]);
342 skb_queue_head_init(&sta->tx_filtered[i]);
345 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
346 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
348 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
349 if (sdata->vif.type == NL80211_IFTYPE_AP ||
350 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
351 struct ieee80211_supported_band *sband =
352 local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
353 u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
354 IEEE80211_HT_CAP_SM_PS_SHIFT;
356 * Assume that hostapd advertises our caps in the beacon and
357 * this is the known_smps_mode for a station that just assciated
360 case WLAN_HT_SMPS_CONTROL_DISABLED:
361 sta->known_smps_mode = IEEE80211_SMPS_OFF;
363 case WLAN_HT_SMPS_CONTROL_STATIC:
364 sta->known_smps_mode = IEEE80211_SMPS_STATIC;
366 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
367 sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
376 tx_latency = rcu_dereference(local->tx_latency);
377 /* init stations Tx latency statistics && TID bins */
379 sta->tx_lat = kzalloc(IEEE80211_NUM_TIDS *
380 sizeof(struct ieee80211_tx_latency_stat),
384 * if Tx latency and bins are enabled and the previous allocation
387 if (tx_latency && tx_latency->n_ranges && sta->tx_lat)
388 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
389 /* size of bins is size of the ranges +1 */
390 sta->tx_lat[i].bin_count =
391 tx_latency->n_ranges + 1;
392 sta->tx_lat[i].bins = kcalloc(sta->tx_lat[i].bin_count,
399 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
404 static int sta_info_insert_check(struct sta_info *sta)
406 struct ieee80211_sub_if_data *sdata = sta->sdata;
409 * Can't be a WARN_ON because it can be triggered through a race:
410 * something inserts a STA (on one CPU) without holding the RTNL
411 * and another CPU turns off the net device.
413 if (unlikely(!ieee80211_sdata_running(sdata)))
416 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
417 is_multicast_ether_addr(sta->sta.addr)))
423 static int sta_info_insert_drv_state(struct ieee80211_local *local,
424 struct ieee80211_sub_if_data *sdata,
425 struct sta_info *sta)
427 enum ieee80211_sta_state state;
430 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
431 err = drv_sta_state(local, sdata, sta, state, state + 1);
438 * Drivers using legacy sta_add/sta_remove callbacks only
439 * get uploaded set to true after sta_add is called.
441 if (!local->ops->sta_add)
442 sta->uploaded = true;
446 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
448 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
449 sta->sta.addr, state + 1, err);
453 /* unwind on error */
454 for (; state > IEEE80211_STA_NOTEXIST; state--)
455 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
461 * should be called with sta_mtx locked
462 * this function replaces the mutex lock
465 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
467 struct ieee80211_local *local = sta->local;
468 struct ieee80211_sub_if_data *sdata = sta->sdata;
469 struct station_info sinfo;
472 lockdep_assert_held(&local->sta_mtx);
474 /* check if STA exists already */
475 if (sta_info_get_bss(sdata, sta->sta.addr)) {
481 err = sta_info_insert_drv_state(local, sdata, sta);
486 local->sta_generation++;
489 /* make the station visible */
490 sta_info_hash_add(local, sta);
492 list_add_rcu(&sta->list, &local->sta_list);
494 set_sta_flag(sta, WLAN_STA_INSERTED);
496 ieee80211_recalc_min_chandef(sdata);
497 ieee80211_sta_debugfs_add(sta);
498 rate_control_add_sta_debugfs(sta);
500 memset(&sinfo, 0, sizeof(sinfo));
502 sinfo.generation = local->sta_generation;
503 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
505 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
507 /* move reference to rcu-protected */
509 mutex_unlock(&local->sta_mtx);
511 if (ieee80211_vif_is_mesh(&sdata->vif))
512 mesh_accept_plinks_update(sdata);
516 mutex_unlock(&local->sta_mtx);
521 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
523 struct ieee80211_local *local = sta->local;
528 err = sta_info_insert_check(sta);
534 mutex_lock(&local->sta_mtx);
536 err = sta_info_insert_finish(sta);
543 sta_info_free(local, sta);
547 int sta_info_insert(struct sta_info *sta)
549 int err = sta_info_insert_rcu(sta);
556 static inline void __bss_tim_set(u8 *tim, u16 id)
559 * This format has been mandated by the IEEE specifications,
560 * so this line may not be changed to use the __set_bit() format.
562 tim[id / 8] |= (1 << (id % 8));
565 static inline void __bss_tim_clear(u8 *tim, u16 id)
568 * This format has been mandated by the IEEE specifications,
569 * so this line may not be changed to use the __clear_bit() format.
571 tim[id / 8] &= ~(1 << (id % 8));
574 static inline bool __bss_tim_get(u8 *tim, u16 id)
577 * This format has been mandated by the IEEE specifications,
578 * so this line may not be changed to use the test_bit() format.
580 return tim[id / 8] & (1 << (id % 8));
583 static unsigned long ieee80211_tids_for_ac(int ac)
585 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
587 case IEEE80211_AC_VO:
588 return BIT(6) | BIT(7);
589 case IEEE80211_AC_VI:
590 return BIT(4) | BIT(5);
591 case IEEE80211_AC_BE:
592 return BIT(0) | BIT(3);
593 case IEEE80211_AC_BK:
594 return BIT(1) | BIT(2);
601 void sta_info_recalc_tim(struct sta_info *sta)
603 struct ieee80211_local *local = sta->local;
605 bool indicate_tim = false;
606 u8 ignore_for_tim = sta->sta.uapsd_queues;
610 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
611 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
612 if (WARN_ON_ONCE(!sta->sdata->bss))
615 ps = &sta->sdata->bss->ps;
617 #ifdef CONFIG_MAC80211_MESH
618 } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
619 ps = &sta->sdata->u.mesh.ps;
620 /* TIM map only for 1 <= PLID <= IEEE80211_MAX_AID */
621 id = sta->plid % (IEEE80211_MAX_AID + 1);
627 /* No need to do anything if the driver does all */
628 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
635 * If all ACs are delivery-enabled then we should build
636 * the TIM bit for all ACs anyway; if only some are then
637 * we ignore those and build the TIM bit using only the
640 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
643 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
646 if (ignore_for_tim & BIT(ac))
649 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
650 !skb_queue_empty(&sta->ps_tx_buf[ac]);
654 tids = ieee80211_tids_for_ac(ac);
657 sta->driver_buffered_tids & tids;
661 spin_lock_bh(&local->tim_lock);
663 if (indicate_tim == __bss_tim_get(ps->tim, id))
667 __bss_tim_set(ps->tim, id);
669 __bss_tim_clear(ps->tim, id);
671 if (local->ops->set_tim) {
672 local->tim_in_locked_section = true;
673 drv_set_tim(local, &sta->sta, indicate_tim);
674 local->tim_in_locked_section = false;
678 spin_unlock_bh(&local->tim_lock);
681 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
683 struct ieee80211_tx_info *info;
689 info = IEEE80211_SKB_CB(skb);
691 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
692 timeout = (sta->listen_interval *
693 sta->sdata->vif.bss_conf.beacon_int *
695 if (timeout < STA_TX_BUFFER_EXPIRE)
696 timeout = STA_TX_BUFFER_EXPIRE;
697 return time_after(jiffies, info->control.jiffies + timeout);
701 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
702 struct sta_info *sta, int ac)
708 * First check for frames that should expire on the filtered
709 * queue. Frames here were rejected by the driver and are on
710 * a separate queue to avoid reordering with normal PS-buffered
711 * frames. They also aren't accounted for right now in the
712 * total_ps_buffered counter.
715 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
716 skb = skb_peek(&sta->tx_filtered[ac]);
717 if (sta_info_buffer_expired(sta, skb))
718 skb = __skb_dequeue(&sta->tx_filtered[ac]);
721 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
724 * Frames are queued in order, so if this one
725 * hasn't expired yet we can stop testing. If
726 * we actually reached the end of the queue we
727 * also need to stop, of course.
731 ieee80211_free_txskb(&local->hw, skb);
735 * Now also check the normal PS-buffered queue, this will
736 * only find something if the filtered queue was emptied
737 * since the filtered frames are all before the normal PS
741 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
742 skb = skb_peek(&sta->ps_tx_buf[ac]);
743 if (sta_info_buffer_expired(sta, skb))
744 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
747 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
750 * frames are queued in order, so if this one
751 * hasn't expired yet (or we reached the end of
752 * the queue) we can stop testing
757 local->total_ps_buffered--;
758 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
760 ieee80211_free_txskb(&local->hw, skb);
764 * Finally, recalculate the TIM bit for this station -- it might
765 * now be clear because the station was too slow to retrieve its
768 sta_info_recalc_tim(sta);
771 * Return whether there are any frames still buffered, this is
772 * used to check whether the cleanup timer still needs to run,
773 * if there are no frames we don't need to rearm the timer.
775 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
776 skb_queue_empty(&sta->tx_filtered[ac]));
779 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
780 struct sta_info *sta)
782 bool have_buffered = false;
785 /* This is only necessary for stations on BSS/MBSS interfaces */
786 if (!sta->sdata->bss &&
787 !ieee80211_vif_is_mesh(&sta->sdata->vif))
790 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
792 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
794 return have_buffered;
797 int __must_check __sta_info_destroy(struct sta_info *sta)
799 struct ieee80211_local *local;
800 struct ieee80211_sub_if_data *sdata;
811 lockdep_assert_held(&local->sta_mtx);
814 * Before removing the station from the driver and
815 * rate control, it might still start new aggregation
816 * sessions -- block that to make sure the tear-down
817 * will be sufficient.
819 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
820 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
822 ret = sta_info_hash_del(local, sta);
826 list_del_rcu(&sta->list);
828 drv_sta_pre_rcu_remove(local, sta->sdata, sta);
830 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
831 rcu_access_pointer(sdata->u.vlan.sta) == sta)
832 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
835 /* now keys can no longer be reached */
836 ieee80211_free_sta_keys(local, sta);
841 local->sta_generation++;
843 while (sta->sta_state > IEEE80211_STA_NONE) {
844 ret = sta_info_move_state(sta, sta->sta_state - 1);
852 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
853 IEEE80211_STA_NOTEXIST);
854 WARN_ON_ONCE(ret != 0);
857 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
859 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
861 rate_control_remove_sta_debugfs(sta);
862 ieee80211_sta_debugfs_remove(sta);
863 ieee80211_recalc_min_chandef(sdata);
865 cleanup_single_sta(sta);
870 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
872 struct sta_info *sta;
875 mutex_lock(&sdata->local->sta_mtx);
876 sta = sta_info_get(sdata, addr);
877 ret = __sta_info_destroy(sta);
878 mutex_unlock(&sdata->local->sta_mtx);
883 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
886 struct sta_info *sta;
889 mutex_lock(&sdata->local->sta_mtx);
890 sta = sta_info_get_bss(sdata, addr);
891 ret = __sta_info_destroy(sta);
892 mutex_unlock(&sdata->local->sta_mtx);
897 static void sta_info_cleanup(unsigned long data)
899 struct ieee80211_local *local = (struct ieee80211_local *) data;
900 struct sta_info *sta;
901 bool timer_needed = false;
904 list_for_each_entry_rcu(sta, &local->sta_list, list)
905 if (sta_info_cleanup_expire_buffered(local, sta))
909 if (local->quiescing)
915 mod_timer(&local->sta_cleanup,
916 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
919 void sta_info_init(struct ieee80211_local *local)
921 spin_lock_init(&local->tim_lock);
922 mutex_init(&local->sta_mtx);
923 INIT_LIST_HEAD(&local->sta_list);
925 setup_timer(&local->sta_cleanup, sta_info_cleanup,
926 (unsigned long)local);
929 void sta_info_stop(struct ieee80211_local *local)
931 del_timer_sync(&local->sta_cleanup);
935 int sta_info_flush(struct ieee80211_sub_if_data *sdata)
937 struct ieee80211_local *local = sdata->local;
938 struct sta_info *sta, *tmp;
943 mutex_lock(&local->sta_mtx);
944 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
945 if (sdata == sta->sdata) {
946 WARN_ON(__sta_info_destroy(sta));
950 mutex_unlock(&local->sta_mtx);
955 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
956 unsigned long exp_time)
958 struct ieee80211_local *local = sdata->local;
959 struct sta_info *sta, *tmp;
961 mutex_lock(&local->sta_mtx);
963 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
964 if (sdata != sta->sdata)
967 if (time_after(jiffies, sta->last_rx + exp_time)) {
968 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
971 if (ieee80211_vif_is_mesh(&sdata->vif) &&
972 test_sta_flag(sta, WLAN_STA_PS_STA))
973 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
975 WARN_ON(__sta_info_destroy(sta));
979 mutex_unlock(&local->sta_mtx);
982 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
986 struct sta_info *sta, *nxt;
989 * Just return a random station if localaddr is NULL
992 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
994 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1003 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1005 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1008 struct sta_info *sta;
1013 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1022 EXPORT_SYMBOL(ieee80211_find_sta);
1024 static void clear_sta_ps_flags(void *_sta)
1026 struct sta_info *sta = _sta;
1027 struct ieee80211_sub_if_data *sdata = sta->sdata;
1030 if (sdata->vif.type == NL80211_IFTYPE_AP ||
1031 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1032 ps = &sdata->bss->ps;
1033 else if (ieee80211_vif_is_mesh(&sdata->vif))
1034 ps = &sdata->u.mesh.ps;
1038 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1039 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
1040 atomic_dec(&ps->num_sta_ps);
1043 /* powersave support code */
1044 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1046 struct ieee80211_sub_if_data *sdata = sta->sdata;
1047 struct ieee80211_local *local = sdata->local;
1048 struct sk_buff_head pending;
1049 int filtered = 0, buffered = 0, ac;
1050 unsigned long flags;
1052 clear_sta_flag(sta, WLAN_STA_SP);
1054 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1055 sta->driver_buffered_tids = 0;
1057 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1058 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1060 skb_queue_head_init(&pending);
1062 /* Send all buffered frames to the station */
1063 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1064 int count = skb_queue_len(&pending), tmp;
1066 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1067 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1068 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1069 tmp = skb_queue_len(&pending);
1070 filtered += tmp - count;
1073 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1074 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1075 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1076 tmp = skb_queue_len(&pending);
1077 buffered += tmp - count;
1080 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
1082 /* This station just woke up and isn't aware of our SMPS state */
1083 if (!ieee80211_smps_is_restrictive(sta->known_smps_mode,
1084 sdata->smps_mode) &&
1085 sta->known_smps_mode != sdata->bss->req_smps &&
1086 sta_info_tx_streams(sta) != 1) {
1088 "%pM just woke up and MIMO capable - update SMPS\n",
1090 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1092 sdata->vif.bss_conf.bssid);
1095 local->total_ps_buffered -= buffered;
1097 sta_info_recalc_tim(sta);
1100 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1101 sta->sta.addr, sta->sta.aid, filtered, buffered);
1104 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1105 struct sta_info *sta, int tid,
1106 enum ieee80211_frame_release_type reason)
1108 struct ieee80211_local *local = sdata->local;
1109 struct ieee80211_qos_hdr *nullfunc;
1110 struct sk_buff *skb;
1111 int size = sizeof(*nullfunc);
1113 bool qos = test_sta_flag(sta, WLAN_STA_WME);
1114 struct ieee80211_tx_info *info;
1115 struct ieee80211_chanctx_conf *chanctx_conf;
1118 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1119 IEEE80211_STYPE_QOS_NULLFUNC |
1120 IEEE80211_FCTL_FROMDS);
1123 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1124 IEEE80211_STYPE_NULLFUNC |
1125 IEEE80211_FCTL_FROMDS);
1128 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1132 skb_reserve(skb, local->hw.extra_tx_headroom);
1134 nullfunc = (void *) skb_put(skb, size);
1135 nullfunc->frame_control = fc;
1136 nullfunc->duration_id = 0;
1137 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1138 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1139 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1141 skb->priority = tid;
1142 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1144 nullfunc->qos_ctrl = cpu_to_le16(tid);
1146 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1147 nullfunc->qos_ctrl |=
1148 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1151 info = IEEE80211_SKB_CB(skb);
1154 * Tell TX path to send this frame even though the
1155 * STA may still remain is PS mode after this frame
1156 * exchange. Also set EOSP to indicate this packet
1157 * ends the poll/service period.
1159 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1160 IEEE80211_TX_CTL_PS_RESPONSE |
1161 IEEE80211_TX_STATUS_EOSP |
1162 IEEE80211_TX_CTL_REQ_TX_STATUS;
1164 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1166 skb->dev = sdata->dev;
1169 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1170 if (WARN_ON(!chanctx_conf)) {
1176 ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band);
1181 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1182 int n_frames, u8 ignored_acs,
1183 enum ieee80211_frame_release_type reason)
1185 struct ieee80211_sub_if_data *sdata = sta->sdata;
1186 struct ieee80211_local *local = sdata->local;
1188 bool more_data = false;
1190 unsigned long driver_release_tids = 0;
1191 struct sk_buff_head frames;
1193 /* Service or PS-Poll period starts */
1194 set_sta_flag(sta, WLAN_STA_SP);
1196 __skb_queue_head_init(&frames);
1199 * Get response frame(s) and more data bit for it.
1201 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1204 if (ignored_acs & BIT(ac))
1207 tids = ieee80211_tids_for_ac(ac);
1210 driver_release_tids = sta->driver_buffered_tids & tids;
1211 if (driver_release_tids) {
1214 struct sk_buff *skb;
1216 while (n_frames > 0) {
1217 skb = skb_dequeue(&sta->tx_filtered[ac]);
1220 &sta->ps_tx_buf[ac]);
1222 local->total_ps_buffered--;
1228 __skb_queue_tail(&frames, skb);
1233 * If the driver has data on more than one TID then
1234 * certainly there's more data if we release just a
1235 * single frame now (from a single TID).
1237 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1238 hweight16(driver_release_tids) > 1) {
1240 driver_release_tids =
1241 BIT(ffs(driver_release_tids) - 1);
1246 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1247 !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1257 * For PS-Poll, this can only happen due to a race condition
1258 * when we set the TIM bit and the station notices it, but
1259 * before it can poll for the frame we expire it.
1261 * For uAPSD, this is said in the standard (11.2.1.5 h):
1262 * At each unscheduled SP for a non-AP STA, the AP shall
1263 * attempt to transmit at least one MSDU or MMPDU, but no
1264 * more than the value specified in the Max SP Length field
1265 * in the QoS Capability element from delivery-enabled ACs,
1266 * that are destined for the non-AP STA.
1268 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1271 /* This will evaluate to 1, 3, 5 or 7. */
1272 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1274 ieee80211_send_null_response(sdata, sta, tid, reason);
1278 if (!driver_release_tids) {
1279 struct sk_buff_head pending;
1280 struct sk_buff *skb;
1284 skb_queue_head_init(&pending);
1286 while ((skb = __skb_dequeue(&frames))) {
1287 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1288 struct ieee80211_hdr *hdr = (void *) skb->data;
1294 * Tell TX path to send this frame even though the
1295 * STA may still remain is PS mode after this frame
1298 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1299 IEEE80211_TX_CTL_PS_RESPONSE;
1302 * Use MoreData flag to indicate whether there are
1303 * more buffered frames for this STA
1305 if (more_data || !skb_queue_empty(&frames))
1306 hdr->frame_control |=
1307 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1309 hdr->frame_control &=
1310 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1312 if (ieee80211_is_data_qos(hdr->frame_control) ||
1313 ieee80211_is_qos_nullfunc(hdr->frame_control))
1314 qoshdr = ieee80211_get_qos_ctl(hdr);
1316 /* end service period after last frame */
1317 if (skb_queue_empty(&frames)) {
1318 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1320 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1322 info->flags |= IEEE80211_TX_STATUS_EOSP |
1323 IEEE80211_TX_CTL_REQ_TX_STATUS;
1327 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1331 __skb_queue_tail(&pending, skb);
1334 drv_allow_buffered_frames(local, sta, tids, num,
1337 ieee80211_add_pending_skbs(local, &pending);
1339 sta_info_recalc_tim(sta);
1342 * We need to release a frame that is buffered somewhere in the
1343 * driver ... it'll have to handle that.
1344 * Note that, as per the comment above, it'll also have to see
1345 * if there is more than just one frame on the specific TID that
1346 * we're releasing from, and it needs to set the more-data bit
1347 * accordingly if we tell it that there's no more data. If we do
1348 * tell it there's more data, then of course the more-data bit
1349 * needs to be set anyway.
1351 drv_release_buffered_frames(local, sta, driver_release_tids,
1352 n_frames, reason, more_data);
1355 * Note that we don't recalculate the TIM bit here as it would
1356 * most likely have no effect at all unless the driver told us
1357 * that the TID became empty before returning here from the
1359 * Either way, however, when the driver tells us that the TID
1360 * became empty we'll do the TIM recalculation.
1365 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1367 u8 ignore_for_response = sta->sta.uapsd_queues;
1370 * If all ACs are delivery-enabled then we should reply
1371 * from any of them, if only some are enabled we reply
1372 * only from the non-enabled ones.
1374 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1375 ignore_for_response = 0;
1377 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1378 IEEE80211_FRAME_RELEASE_PSPOLL);
1381 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1383 int n_frames = sta->sta.max_sp;
1384 u8 delivery_enabled = sta->sta.uapsd_queues;
1387 * If we ever grow support for TSPEC this might happen if
1388 * the TSPEC update from hostapd comes in between a trigger
1389 * frame setting WLAN_STA_UAPSD in the RX path and this
1390 * actually getting called.
1392 if (!delivery_enabled)
1395 switch (sta->sta.max_sp) {
1406 /* XXX: what is a good value? */
1411 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1412 IEEE80211_FRAME_RELEASE_UAPSD);
1415 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1416 struct ieee80211_sta *pubsta, bool block)
1418 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1420 trace_api_sta_block_awake(sta->local, pubsta, block);
1423 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1424 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1425 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1427 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1429 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1431 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1432 struct ieee80211_local *local = sta->local;
1434 trace_api_eosp(local, pubsta);
1436 clear_sta_flag(sta, WLAN_STA_SP);
1438 EXPORT_SYMBOL(ieee80211_sta_eosp);
1440 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1441 u8 tid, bool buffered)
1443 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1445 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1449 set_bit(tid, &sta->driver_buffered_tids);
1451 clear_bit(tid, &sta->driver_buffered_tids);
1453 sta_info_recalc_tim(sta);
1455 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1457 int sta_info_move_state(struct sta_info *sta,
1458 enum ieee80211_sta_state new_state)
1462 if (sta->sta_state == new_state)
1465 /* check allowed transitions first */
1467 switch (new_state) {
1468 case IEEE80211_STA_NONE:
1469 if (sta->sta_state != IEEE80211_STA_AUTH)
1472 case IEEE80211_STA_AUTH:
1473 if (sta->sta_state != IEEE80211_STA_NONE &&
1474 sta->sta_state != IEEE80211_STA_ASSOC)
1477 case IEEE80211_STA_ASSOC:
1478 if (sta->sta_state != IEEE80211_STA_AUTH &&
1479 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1482 case IEEE80211_STA_AUTHORIZED:
1483 if (sta->sta_state != IEEE80211_STA_ASSOC)
1487 WARN(1, "invalid state %d", new_state);
1491 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1492 sta->sta.addr, new_state);
1495 * notify the driver before the actual changes so it can
1496 * fail the transition
1498 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1499 int err = drv_sta_state(sta->local, sta->sdata, sta,
1500 sta->sta_state, new_state);
1505 /* reflect the change in all state variables */
1507 switch (new_state) {
1508 case IEEE80211_STA_NONE:
1509 if (sta->sta_state == IEEE80211_STA_AUTH)
1510 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1512 case IEEE80211_STA_AUTH:
1513 if (sta->sta_state == IEEE80211_STA_NONE)
1514 set_bit(WLAN_STA_AUTH, &sta->_flags);
1515 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1516 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1518 case IEEE80211_STA_ASSOC:
1519 if (sta->sta_state == IEEE80211_STA_AUTH) {
1520 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1521 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1522 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1523 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1524 !sta->sdata->u.vlan.sta))
1525 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1526 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1529 case IEEE80211_STA_AUTHORIZED:
1530 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1531 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1532 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1533 !sta->sdata->u.vlan.sta))
1534 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1535 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1542 sta->sta_state = new_state;
1547 u8 sta_info_tx_streams(struct sta_info *sta)
1549 struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1552 if (!sta->sta.ht_cap.ht_supported)
1555 if (sta->sta.vht_cap.vht_supported) {
1558 le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1560 for (i = 7; i >= 0; i--)
1561 if ((tx_mcs_map & (0x3 << (i * 2))) !=
1562 IEEE80211_VHT_MCS_NOT_SUPPORTED)
1566 if (ht_cap->mcs.rx_mask[3])
1568 else if (ht_cap->mcs.rx_mask[2])
1570 else if (ht_cap->mcs.rx_mask[1])
1575 if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1578 return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1579 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;