2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
4 * Copyright 2013-2014 Intel Mobile Communications GmbH
5 * Copyright (C) 2015 - 2016 Intel Deutschland GmbH
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/etherdevice.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/timer.h>
21 #include <linux/rtnetlink.h>
23 #include <net/mac80211.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
28 #include "debugfs_sta.h"
33 * DOC: STA information lifetime rules
35 * STA info structures (&struct sta_info) are managed in a hash table
36 * for faster lookup and a list for iteration. They are managed using
37 * RCU, i.e. access to the list and hash table is protected by RCU.
39 * Upon allocating a STA info structure with sta_info_alloc(), the caller
40 * owns that structure. It must then insert it into the hash table using
41 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
42 * case (which acquires an rcu read section but must not be called from
43 * within one) will the pointer still be valid after the call. Note that
44 * the caller may not do much with the STA info before inserting it, in
45 * particular, it may not start any mesh peer link management or add
48 * When the insertion fails (sta_info_insert()) returns non-zero), the
49 * structure will have been freed by sta_info_insert()!
51 * Station entries are added by mac80211 when you establish a link with a
52 * peer. This means different things for the different type of interfaces
53 * we support. For a regular station this mean we add the AP sta when we
54 * receive an association response from the AP. For IBSS this occurs when
55 * get to know about a peer on the same IBSS. For WDS we add the sta for
56 * the peer immediately upon device open. When using AP mode we add stations
57 * for each respective station upon request from userspace through nl80211.
59 * In order to remove a STA info structure, various sta_info_destroy_*()
60 * calls are available.
62 * There is no concept of ownership on a STA entry, each structure is
63 * owned by the global hash table/list until it is removed. All users of
64 * the structure need to be RCU protected so that the structure won't be
65 * freed before they are done using it.
68 static const struct rhashtable_params sta_rht_params = {
69 .nelem_hint = 3, /* start small */
70 .automatic_shrinking = true,
71 .head_offset = offsetof(struct sta_info, hash_node),
72 .key_offset = offsetof(struct sta_info, addr),
74 .hashfn = sta_addr_hash,
75 .max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
78 /* Caller must hold local->sta_mtx */
79 static int sta_info_hash_del(struct ieee80211_local *local,
82 return rhashtable_remove_fast(&local->sta_hash, &sta->hash_node,
86 static void __cleanup_single_sta(struct sta_info *sta)
89 struct tid_ampdu_tx *tid_tx;
90 struct ieee80211_sub_if_data *sdata = sta->sdata;
91 struct ieee80211_local *local = sdata->local;
94 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
95 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
96 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
97 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
98 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
100 else if (ieee80211_vif_is_mesh(&sdata->vif))
101 ps = &sdata->u.mesh.ps;
105 clear_sta_flag(sta, WLAN_STA_PS_STA);
106 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
107 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
109 atomic_dec(&ps->num_sta_ps);
112 if (sta->sta.txq[0]) {
113 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
114 struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
115 int n = skb_queue_len(&txqi->queue);
117 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
118 atomic_sub(n, &sdata->txqs_len[txqi->txq.ac]);
123 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
124 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
125 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
126 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
129 if (ieee80211_vif_is_mesh(&sdata->vif))
130 mesh_sta_cleanup(sta);
132 cancel_work_sync(&sta->drv_deliver_wk);
135 * Destroy aggregation state here. It would be nice to wait for the
136 * driver to finish aggregation stop and then clean up, but for now
137 * drivers have to handle aggregation stop being requested, followed
138 * directly by station destruction.
140 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
141 kfree(sta->ampdu_mlme.tid_start_tx[i]);
142 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
145 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
150 static void cleanup_single_sta(struct sta_info *sta)
152 struct ieee80211_sub_if_data *sdata = sta->sdata;
153 struct ieee80211_local *local = sdata->local;
155 __cleanup_single_sta(sta);
156 sta_info_free(local, sta);
159 /* protected by RCU */
160 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
163 struct ieee80211_local *local = sdata->local;
164 struct sta_info *sta;
165 struct rhash_head *tmp;
166 const struct bucket_table *tbl;
169 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
171 for_each_sta_info(local, tbl, addr, sta, tmp) {
172 if (sta->sdata == sdata) {
174 /* this is safe as the caller must already hold
175 * another rcu read section or the mutex
185 * Get sta info either from the specified interface
186 * or from one of its vlans
188 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
191 struct ieee80211_local *local = sdata->local;
192 struct sta_info *sta;
193 struct rhash_head *tmp;
194 const struct bucket_table *tbl;
197 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
199 for_each_sta_info(local, tbl, addr, sta, tmp) {
200 if (sta->sdata == sdata ||
201 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
203 /* this is safe as the caller must already hold
204 * another rcu read section or the mutex
213 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
216 struct ieee80211_local *local = sdata->local;
217 struct sta_info *sta;
220 list_for_each_entry_rcu(sta, &local->sta_list, list) {
221 if (sdata != sta->sdata)
234 * sta_info_free - free STA
236 * @local: pointer to the global information
237 * @sta: STA info to free
239 * This function must undo everything done by sta_info_alloc()
240 * that may happen before sta_info_insert(). It may only be
241 * called when sta_info_insert() has not been attempted (and
242 * if that fails, the station is freed anyway.)
244 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
247 rate_control_free_sta(sta);
249 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
252 kfree(to_txq_info(sta->sta.txq[0]));
253 kfree(rcu_dereference_raw(sta->sta.rates));
254 #ifdef CONFIG_MAC80211_MESH
260 /* Caller must hold local->sta_mtx */
261 static void sta_info_hash_add(struct ieee80211_local *local,
262 struct sta_info *sta)
264 rhashtable_insert_fast(&local->sta_hash, &sta->hash_node,
268 static void sta_deliver_ps_frames(struct work_struct *wk)
270 struct sta_info *sta;
272 sta = container_of(wk, struct sta_info, drv_deliver_wk);
278 if (!test_sta_flag(sta, WLAN_STA_PS_STA))
279 ieee80211_sta_ps_deliver_wakeup(sta);
280 else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
281 ieee80211_sta_ps_deliver_poll_response(sta);
282 else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
283 ieee80211_sta_ps_deliver_uapsd(sta);
287 static int sta_prepare_rate_control(struct ieee80211_local *local,
288 struct sta_info *sta, gfp_t gfp)
290 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
293 sta->rate_ctrl = local->rate_ctrl;
294 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
296 if (!sta->rate_ctrl_priv)
302 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
303 const u8 *addr, gfp_t gfp)
305 struct ieee80211_local *local = sdata->local;
306 struct ieee80211_hw *hw = &local->hw;
307 struct sta_info *sta;
310 sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
314 spin_lock_init(&sta->lock);
315 spin_lock_init(&sta->ps_lock);
316 INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
317 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
318 mutex_init(&sta->ampdu_mlme.mtx);
319 #ifdef CONFIG_MAC80211_MESH
320 if (ieee80211_vif_is_mesh(&sdata->vif)) {
321 sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
324 spin_lock_init(&sta->mesh->plink_lock);
325 if (ieee80211_vif_is_mesh(&sdata->vif) &&
326 !sdata->u.mesh.user_mpm)
327 init_timer(&sta->mesh->plink_timer);
328 sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
332 memcpy(sta->addr, addr, ETH_ALEN);
333 memcpy(sta->sta.addr, addr, ETH_ALEN);
336 sta->rx_stats.last_rx = jiffies;
338 u64_stats_init(&sta->rx_stats.syncp);
340 sta->sta_state = IEEE80211_STA_NONE;
342 /* Mark TID as unreserved */
343 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
345 sta->last_connected = ktime_get_seconds();
346 ewma_signal_init(&sta->rx_stats_avg.signal);
347 for (i = 0; i < ARRAY_SIZE(sta->rx_stats_avg.chain_signal); i++)
348 ewma_signal_init(&sta->rx_stats_avg.chain_signal[i]);
350 if (local->ops->wake_tx_queue) {
352 int size = sizeof(struct txq_info) +
353 ALIGN(hw->txq_data_size, sizeof(void *));
355 txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
359 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
360 struct txq_info *txq = txq_data + i * size;
362 ieee80211_init_tx_queue(sdata, sta, txq, i);
366 if (sta_prepare_rate_control(local, sta, gfp))
369 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
371 * timer_to_tid must be initialized with identity mapping
372 * to enable session_timer's data differentiation. See
373 * sta_rx_agg_session_timer_expired for usage.
375 sta->timer_to_tid[i] = i;
377 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
378 skb_queue_head_init(&sta->ps_tx_buf[i]);
379 skb_queue_head_init(&sta->tx_filtered[i]);
382 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
383 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
385 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
386 if (sdata->vif.type == NL80211_IFTYPE_AP ||
387 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
388 struct ieee80211_supported_band *sband =
389 hw->wiphy->bands[ieee80211_get_sdata_band(sdata)];
390 u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
391 IEEE80211_HT_CAP_SM_PS_SHIFT;
393 * Assume that hostapd advertises our caps in the beacon and
394 * this is the known_smps_mode for a station that just assciated
397 case WLAN_HT_SMPS_CONTROL_DISABLED:
398 sta->known_smps_mode = IEEE80211_SMPS_OFF;
400 case WLAN_HT_SMPS_CONTROL_STATIC:
401 sta->known_smps_mode = IEEE80211_SMPS_STATIC;
403 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
404 sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
411 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
417 kfree(to_txq_info(sta->sta.txq[0]));
419 #ifdef CONFIG_MAC80211_MESH
426 static int sta_info_insert_check(struct sta_info *sta)
428 struct ieee80211_sub_if_data *sdata = sta->sdata;
431 * Can't be a WARN_ON because it can be triggered through a race:
432 * something inserts a STA (on one CPU) without holding the RTNL
433 * and another CPU turns off the net device.
435 if (unlikely(!ieee80211_sdata_running(sdata)))
438 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
439 is_multicast_ether_addr(sta->sta.addr)))
442 /* Strictly speaking this isn't necessary as we hold the mutex, but
443 * the rhashtable code can't really deal with that distinction. We
444 * do require the mutex for correctness though.
447 lockdep_assert_held(&sdata->local->sta_mtx);
448 if (ieee80211_hw_check(&sdata->local->hw, NEEDS_UNIQUE_STA_ADDR) &&
449 ieee80211_find_sta_by_ifaddr(&sdata->local->hw, sta->addr, NULL)) {
458 static int sta_info_insert_drv_state(struct ieee80211_local *local,
459 struct ieee80211_sub_if_data *sdata,
460 struct sta_info *sta)
462 enum ieee80211_sta_state state;
465 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
466 err = drv_sta_state(local, sdata, sta, state, state + 1);
473 * Drivers using legacy sta_add/sta_remove callbacks only
474 * get uploaded set to true after sta_add is called.
476 if (!local->ops->sta_add)
477 sta->uploaded = true;
481 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
483 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
484 sta->sta.addr, state + 1, err);
488 /* unwind on error */
489 for (; state > IEEE80211_STA_NOTEXIST; state--)
490 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
496 * should be called with sta_mtx locked
497 * this function replaces the mutex lock
500 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
502 struct ieee80211_local *local = sta->local;
503 struct ieee80211_sub_if_data *sdata = sta->sdata;
504 struct station_info *sinfo;
507 lockdep_assert_held(&local->sta_mtx);
509 sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
515 /* check if STA exists already */
516 if (sta_info_get_bss(sdata, sta->sta.addr)) {
522 local->sta_generation++;
525 /* simplify things and don't accept BA sessions yet */
526 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
528 /* make the station visible */
529 sta_info_hash_add(local, sta);
531 list_add_tail_rcu(&sta->list, &local->sta_list);
534 err = sta_info_insert_drv_state(local, sdata, sta);
538 set_sta_flag(sta, WLAN_STA_INSERTED);
539 /* accept BA sessions now */
540 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
542 ieee80211_sta_debugfs_add(sta);
543 rate_control_add_sta_debugfs(sta);
545 sinfo->generation = local->sta_generation;
546 cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
549 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
551 /* move reference to rcu-protected */
553 mutex_unlock(&local->sta_mtx);
555 if (ieee80211_vif_is_mesh(&sdata->vif))
556 mesh_accept_plinks_update(sdata);
560 sta_info_hash_del(local, sta);
561 list_del_rcu(&sta->list);
564 __cleanup_single_sta(sta);
566 mutex_unlock(&local->sta_mtx);
572 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
574 struct ieee80211_local *local = sta->local;
579 mutex_lock(&local->sta_mtx);
581 err = sta_info_insert_check(sta);
583 mutex_unlock(&local->sta_mtx);
588 err = sta_info_insert_finish(sta);
594 sta_info_free(local, sta);
598 int sta_info_insert(struct sta_info *sta)
600 int err = sta_info_insert_rcu(sta);
607 static inline void __bss_tim_set(u8 *tim, u16 id)
610 * This format has been mandated by the IEEE specifications,
611 * so this line may not be changed to use the __set_bit() format.
613 tim[id / 8] |= (1 << (id % 8));
616 static inline void __bss_tim_clear(u8 *tim, u16 id)
619 * This format has been mandated by the IEEE specifications,
620 * so this line may not be changed to use the __clear_bit() format.
622 tim[id / 8] &= ~(1 << (id % 8));
625 static inline bool __bss_tim_get(u8 *tim, u16 id)
628 * This format has been mandated by the IEEE specifications,
629 * so this line may not be changed to use the test_bit() format.
631 return tim[id / 8] & (1 << (id % 8));
634 static unsigned long ieee80211_tids_for_ac(int ac)
636 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
638 case IEEE80211_AC_VO:
639 return BIT(6) | BIT(7);
640 case IEEE80211_AC_VI:
641 return BIT(4) | BIT(5);
642 case IEEE80211_AC_BE:
643 return BIT(0) | BIT(3);
644 case IEEE80211_AC_BK:
645 return BIT(1) | BIT(2);
652 static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
654 struct ieee80211_local *local = sta->local;
656 bool indicate_tim = false;
657 u8 ignore_for_tim = sta->sta.uapsd_queues;
659 u16 id = sta->sta.aid;
661 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
662 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
663 if (WARN_ON_ONCE(!sta->sdata->bss))
666 ps = &sta->sdata->bss->ps;
667 #ifdef CONFIG_MAC80211_MESH
668 } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
669 ps = &sta->sdata->u.mesh.ps;
675 /* No need to do anything if the driver does all */
676 if (ieee80211_hw_check(&local->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)
692 ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
694 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
697 if (ignore_for_tim & BIT(ac))
700 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
701 !skb_queue_empty(&sta->ps_tx_buf[ac]);
705 tids = ieee80211_tids_for_ac(ac);
708 sta->driver_buffered_tids & tids;
710 sta->txq_buffered_tids & tids;
714 spin_lock_bh(&local->tim_lock);
716 if (indicate_tim == __bss_tim_get(ps->tim, id))
720 __bss_tim_set(ps->tim, id);
722 __bss_tim_clear(ps->tim, id);
724 if (local->ops->set_tim && !WARN_ON(sta->dead)) {
725 local->tim_in_locked_section = true;
726 drv_set_tim(local, &sta->sta, indicate_tim);
727 local->tim_in_locked_section = false;
731 spin_unlock_bh(&local->tim_lock);
734 void sta_info_recalc_tim(struct sta_info *sta)
736 __sta_info_recalc_tim(sta, false);
739 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
741 struct ieee80211_tx_info *info;
747 info = IEEE80211_SKB_CB(skb);
749 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
750 timeout = (sta->listen_interval *
751 sta->sdata->vif.bss_conf.beacon_int *
753 if (timeout < STA_TX_BUFFER_EXPIRE)
754 timeout = STA_TX_BUFFER_EXPIRE;
755 return time_after(jiffies, info->control.jiffies + timeout);
759 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
760 struct sta_info *sta, int ac)
766 * First check for frames that should expire on the filtered
767 * queue. Frames here were rejected by the driver and are on
768 * a separate queue to avoid reordering with normal PS-buffered
769 * frames. They also aren't accounted for right now in the
770 * total_ps_buffered counter.
773 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
774 skb = skb_peek(&sta->tx_filtered[ac]);
775 if (sta_info_buffer_expired(sta, skb))
776 skb = __skb_dequeue(&sta->tx_filtered[ac]);
779 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
782 * Frames are queued in order, so if this one
783 * hasn't expired yet we can stop testing. If
784 * we actually reached the end of the queue we
785 * also need to stop, of course.
789 ieee80211_free_txskb(&local->hw, skb);
793 * Now also check the normal PS-buffered queue, this will
794 * only find something if the filtered queue was emptied
795 * since the filtered frames are all before the normal PS
799 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
800 skb = skb_peek(&sta->ps_tx_buf[ac]);
801 if (sta_info_buffer_expired(sta, skb))
802 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
805 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
808 * frames are queued in order, so if this one
809 * hasn't expired yet (or we reached the end of
810 * the queue) we can stop testing
815 local->total_ps_buffered--;
816 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
818 ieee80211_free_txskb(&local->hw, skb);
822 * Finally, recalculate the TIM bit for this station -- it might
823 * now be clear because the station was too slow to retrieve its
826 sta_info_recalc_tim(sta);
829 * Return whether there are any frames still buffered, this is
830 * used to check whether the cleanup timer still needs to run,
831 * if there are no frames we don't need to rearm the timer.
833 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
834 skb_queue_empty(&sta->tx_filtered[ac]));
837 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
838 struct sta_info *sta)
840 bool have_buffered = false;
843 /* This is only necessary for stations on BSS/MBSS interfaces */
844 if (!sta->sdata->bss &&
845 !ieee80211_vif_is_mesh(&sta->sdata->vif))
848 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
850 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
852 return have_buffered;
855 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
857 struct ieee80211_local *local;
858 struct ieee80211_sub_if_data *sdata;
869 lockdep_assert_held(&local->sta_mtx);
872 * Before removing the station from the driver and
873 * rate control, it might still start new aggregation
874 * sessions -- block that to make sure the tear-down
875 * will be sufficient.
877 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
878 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
881 * Before removing the station from the driver there might be pending
882 * rx frames on RSS queues sent prior to the disassociation - wait for
883 * all such frames to be processed.
885 drv_sync_rx_queues(local, sta);
887 ret = sta_info_hash_del(local, sta);
892 * for TDLS peers, make sure to return to the base channel before
895 if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
896 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
897 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
900 list_del_rcu(&sta->list);
903 drv_sta_pre_rcu_remove(local, sta->sdata, sta);
905 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
906 rcu_access_pointer(sdata->u.vlan.sta) == sta)
907 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
912 static void __sta_info_destroy_part2(struct sta_info *sta)
914 struct ieee80211_local *local = sta->local;
915 struct ieee80211_sub_if_data *sdata = sta->sdata;
916 struct station_info *sinfo;
920 * NOTE: This assumes at least synchronize_net() was done
921 * after _part1 and before _part2!
925 lockdep_assert_held(&local->sta_mtx);
927 /* now keys can no longer be reached */
928 ieee80211_free_sta_keys(local, sta);
930 /* disable TIM bit - last chance to tell driver */
931 __sta_info_recalc_tim(sta, true);
936 local->sta_generation++;
938 while (sta->sta_state > IEEE80211_STA_NONE) {
939 ret = sta_info_move_state(sta, sta->sta_state - 1);
947 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
948 IEEE80211_STA_NOTEXIST);
949 WARN_ON_ONCE(ret != 0);
952 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
954 sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
956 sta_set_sinfo(sta, sinfo);
957 cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
960 rate_control_remove_sta_debugfs(sta);
961 ieee80211_sta_debugfs_remove(sta);
963 cleanup_single_sta(sta);
966 int __must_check __sta_info_destroy(struct sta_info *sta)
968 int err = __sta_info_destroy_part1(sta);
975 __sta_info_destroy_part2(sta);
980 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
982 struct sta_info *sta;
985 mutex_lock(&sdata->local->sta_mtx);
986 sta = sta_info_get(sdata, addr);
987 ret = __sta_info_destroy(sta);
988 mutex_unlock(&sdata->local->sta_mtx);
993 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
996 struct sta_info *sta;
999 mutex_lock(&sdata->local->sta_mtx);
1000 sta = sta_info_get_bss(sdata, addr);
1001 ret = __sta_info_destroy(sta);
1002 mutex_unlock(&sdata->local->sta_mtx);
1007 static void sta_info_cleanup(unsigned long data)
1009 struct ieee80211_local *local = (struct ieee80211_local *) data;
1010 struct sta_info *sta;
1011 bool timer_needed = false;
1014 list_for_each_entry_rcu(sta, &local->sta_list, list)
1015 if (sta_info_cleanup_expire_buffered(local, sta))
1016 timer_needed = true;
1019 if (local->quiescing)
1025 mod_timer(&local->sta_cleanup,
1026 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
1029 u32 sta_addr_hash(const void *key, u32 length, u32 seed)
1031 return jhash(key, ETH_ALEN, seed);
1034 int sta_info_init(struct ieee80211_local *local)
1038 err = rhashtable_init(&local->sta_hash, &sta_rht_params);
1042 spin_lock_init(&local->tim_lock);
1043 mutex_init(&local->sta_mtx);
1044 INIT_LIST_HEAD(&local->sta_list);
1046 setup_timer(&local->sta_cleanup, sta_info_cleanup,
1047 (unsigned long)local);
1051 void sta_info_stop(struct ieee80211_local *local)
1053 del_timer_sync(&local->sta_cleanup);
1054 rhashtable_destroy(&local->sta_hash);
1058 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
1060 struct ieee80211_local *local = sdata->local;
1061 struct sta_info *sta, *tmp;
1062 LIST_HEAD(free_list);
1067 WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1068 WARN_ON(vlans && !sdata->bss);
1070 mutex_lock(&local->sta_mtx);
1071 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1072 if (sdata == sta->sdata ||
1073 (vlans && sdata->bss == sta->sdata->bss)) {
1074 if (!WARN_ON(__sta_info_destroy_part1(sta)))
1075 list_add(&sta->free_list, &free_list);
1080 if (!list_empty(&free_list)) {
1082 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1083 __sta_info_destroy_part2(sta);
1085 mutex_unlock(&local->sta_mtx);
1090 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1091 unsigned long exp_time)
1093 struct ieee80211_local *local = sdata->local;
1094 struct sta_info *sta, *tmp;
1096 mutex_lock(&local->sta_mtx);
1098 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1099 unsigned long last_active = ieee80211_sta_last_active(sta);
1101 if (sdata != sta->sdata)
1104 if (time_is_before_jiffies(last_active + exp_time)) {
1105 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1108 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1109 test_sta_flag(sta, WLAN_STA_PS_STA))
1110 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1112 WARN_ON(__sta_info_destroy(sta));
1116 mutex_unlock(&local->sta_mtx);
1119 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1121 const u8 *localaddr)
1123 struct ieee80211_local *local = hw_to_local(hw);
1124 struct sta_info *sta;
1125 struct rhash_head *tmp;
1126 const struct bucket_table *tbl;
1128 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
1131 * Just return a random station if localaddr is NULL
1132 * ... first in list.
1134 for_each_sta_info(local, tbl, addr, sta, tmp) {
1136 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1145 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1147 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1150 struct sta_info *sta;
1155 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1164 EXPORT_SYMBOL(ieee80211_find_sta);
1166 /* powersave support code */
1167 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1169 struct ieee80211_sub_if_data *sdata = sta->sdata;
1170 struct ieee80211_local *local = sdata->local;
1171 struct sk_buff_head pending;
1172 int filtered = 0, buffered = 0, ac, i;
1173 unsigned long flags;
1176 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1177 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1180 if (sdata->vif.type == NL80211_IFTYPE_AP)
1181 ps = &sdata->bss->ps;
1182 else if (ieee80211_vif_is_mesh(&sdata->vif))
1183 ps = &sdata->u.mesh.ps;
1187 clear_sta_flag(sta, WLAN_STA_SP);
1189 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1190 sta->driver_buffered_tids = 0;
1191 sta->txq_buffered_tids = 0;
1193 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1194 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1196 if (sta->sta.txq[0]) {
1197 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
1198 struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
1200 if (!skb_queue_len(&txqi->queue))
1203 drv_wake_tx_queue(local, txqi);
1207 skb_queue_head_init(&pending);
1209 /* sync with ieee80211_tx_h_unicast_ps_buf */
1210 spin_lock(&sta->ps_lock);
1211 /* Send all buffered frames to the station */
1212 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1213 int count = skb_queue_len(&pending), tmp;
1215 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1216 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1217 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1218 tmp = skb_queue_len(&pending);
1219 filtered += tmp - count;
1222 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1223 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1224 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1225 tmp = skb_queue_len(&pending);
1226 buffered += tmp - count;
1229 ieee80211_add_pending_skbs(local, &pending);
1231 /* now we're no longer in the deliver code */
1232 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1234 /* The station might have polled and then woken up before we responded,
1235 * so clear these flags now to avoid them sticking around.
1237 clear_sta_flag(sta, WLAN_STA_PSPOLL);
1238 clear_sta_flag(sta, WLAN_STA_UAPSD);
1239 spin_unlock(&sta->ps_lock);
1241 atomic_dec(&ps->num_sta_ps);
1243 /* This station just woke up and isn't aware of our SMPS state */
1244 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1245 !ieee80211_smps_is_restrictive(sta->known_smps_mode,
1246 sdata->smps_mode) &&
1247 sta->known_smps_mode != sdata->bss->req_smps &&
1248 sta_info_tx_streams(sta) != 1) {
1250 "%pM just woke up and MIMO capable - update SMPS\n",
1252 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1254 sdata->vif.bss_conf.bssid);
1257 local->total_ps_buffered -= buffered;
1259 sta_info_recalc_tim(sta);
1262 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1263 sta->sta.addr, sta->sta.aid, filtered, buffered);
1265 ieee80211_check_fast_xmit(sta);
1268 static void ieee80211_send_null_response(struct sta_info *sta, int tid,
1269 enum ieee80211_frame_release_type reason,
1270 bool call_driver, bool more_data)
1272 struct ieee80211_sub_if_data *sdata = sta->sdata;
1273 struct ieee80211_local *local = sdata->local;
1274 struct ieee80211_qos_hdr *nullfunc;
1275 struct sk_buff *skb;
1276 int size = sizeof(*nullfunc);
1278 bool qos = sta->sta.wme;
1279 struct ieee80211_tx_info *info;
1280 struct ieee80211_chanctx_conf *chanctx_conf;
1283 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1284 IEEE80211_STYPE_QOS_NULLFUNC |
1285 IEEE80211_FCTL_FROMDS);
1288 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1289 IEEE80211_STYPE_NULLFUNC |
1290 IEEE80211_FCTL_FROMDS);
1293 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1297 skb_reserve(skb, local->hw.extra_tx_headroom);
1299 nullfunc = (void *) skb_put(skb, size);
1300 nullfunc->frame_control = fc;
1301 nullfunc->duration_id = 0;
1302 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1303 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1304 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1305 nullfunc->seq_ctrl = 0;
1307 skb->priority = tid;
1308 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1310 nullfunc->qos_ctrl = cpu_to_le16(tid);
1312 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
1313 nullfunc->qos_ctrl |=
1314 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1316 nullfunc->frame_control |=
1317 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1321 info = IEEE80211_SKB_CB(skb);
1324 * Tell TX path to send this frame even though the
1325 * STA may still remain is PS mode after this frame
1326 * exchange. Also set EOSP to indicate this packet
1327 * ends the poll/service period.
1329 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1330 IEEE80211_TX_STATUS_EOSP |
1331 IEEE80211_TX_CTL_REQ_TX_STATUS;
1333 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1336 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1339 skb->dev = sdata->dev;
1342 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1343 if (WARN_ON(!chanctx_conf)) {
1349 info->band = chanctx_conf->def.chan->band;
1350 ieee80211_xmit(sdata, sta, skb);
1354 static int find_highest_prio_tid(unsigned long tids)
1356 /* lower 3 TIDs aren't ordered perfectly */
1358 return fls(tids) - 1;
1359 /* TID 0 is BE just like TID 3 */
1362 return fls(tids) - 1;
1365 /* Indicates if the MORE_DATA bit should be set in the last
1366 * frame obtained by ieee80211_sta_ps_get_frames.
1367 * Note that driver_release_tids is relevant only if
1368 * reason = IEEE80211_FRAME_RELEASE_PSPOLL
1371 ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
1372 enum ieee80211_frame_release_type reason,
1373 unsigned long driver_release_tids)
1377 /* If the driver has data on more than one TID then
1378 * certainly there's more data if we release just a
1379 * single frame now (from a single TID). This will
1380 * only happen for PS-Poll.
1382 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1383 hweight16(driver_release_tids) > 1)
1386 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1387 if (ignored_acs & BIT(ac))
1390 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1391 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1399 ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
1400 enum ieee80211_frame_release_type reason,
1401 struct sk_buff_head *frames,
1402 unsigned long *driver_release_tids)
1404 struct ieee80211_sub_if_data *sdata = sta->sdata;
1405 struct ieee80211_local *local = sdata->local;
1408 /* Get response frame(s) and more data bit for the last one. */
1409 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1412 if (ignored_acs & BIT(ac))
1415 tids = ieee80211_tids_for_ac(ac);
1417 /* if we already have frames from software, then we can't also
1418 * release from hardware queues
1420 if (skb_queue_empty(frames)) {
1421 *driver_release_tids |=
1422 sta->driver_buffered_tids & tids;
1423 *driver_release_tids |= sta->txq_buffered_tids & tids;
1426 if (!*driver_release_tids) {
1427 struct sk_buff *skb;
1429 while (n_frames > 0) {
1430 skb = skb_dequeue(&sta->tx_filtered[ac]);
1433 &sta->ps_tx_buf[ac]);
1435 local->total_ps_buffered--;
1440 __skb_queue_tail(frames, skb);
1444 /* If we have more frames buffered on this AC, then abort the
1445 * loop since we can't send more data from other ACs before
1446 * the buffered frames from this.
1448 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1449 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1455 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1456 int n_frames, u8 ignored_acs,
1457 enum ieee80211_frame_release_type reason)
1459 struct ieee80211_sub_if_data *sdata = sta->sdata;
1460 struct ieee80211_local *local = sdata->local;
1461 unsigned long driver_release_tids = 0;
1462 struct sk_buff_head frames;
1465 /* Service or PS-Poll period starts */
1466 set_sta_flag(sta, WLAN_STA_SP);
1468 __skb_queue_head_init(&frames);
1470 ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
1471 &frames, &driver_release_tids);
1473 more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
1475 if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL)
1476 driver_release_tids =
1477 BIT(find_highest_prio_tid(driver_release_tids));
1479 if (skb_queue_empty(&frames) && !driver_release_tids) {
1483 * For PS-Poll, this can only happen due to a race condition
1484 * when we set the TIM bit and the station notices it, but
1485 * before it can poll for the frame we expire it.
1487 * For uAPSD, this is said in the standard (11.2.1.5 h):
1488 * At each unscheduled SP for a non-AP STA, the AP shall
1489 * attempt to transmit at least one MSDU or MMPDU, but no
1490 * more than the value specified in the Max SP Length field
1491 * in the QoS Capability element from delivery-enabled ACs,
1492 * that are destined for the non-AP STA.
1494 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1497 /* This will evaluate to 1, 3, 5 or 7. */
1498 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1500 ieee80211_send_null_response(sta, tid, reason, true, false);
1501 } else if (!driver_release_tids) {
1502 struct sk_buff_head pending;
1503 struct sk_buff *skb;
1506 bool need_null = false;
1508 skb_queue_head_init(&pending);
1510 while ((skb = __skb_dequeue(&frames))) {
1511 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1512 struct ieee80211_hdr *hdr = (void *) skb->data;
1518 * Tell TX path to send this frame even though the
1519 * STA may still remain is PS mode after this frame
1522 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1523 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1526 * Use MoreData flag to indicate whether there are
1527 * more buffered frames for this STA
1529 if (more_data || !skb_queue_empty(&frames))
1530 hdr->frame_control |=
1531 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1533 hdr->frame_control &=
1534 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1536 if (ieee80211_is_data_qos(hdr->frame_control) ||
1537 ieee80211_is_qos_nullfunc(hdr->frame_control))
1538 qoshdr = ieee80211_get_qos_ctl(hdr);
1540 tids |= BIT(skb->priority);
1542 __skb_queue_tail(&pending, skb);
1544 /* end service period after last frame or add one */
1545 if (!skb_queue_empty(&frames))
1548 if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1549 /* for PS-Poll, there's only one frame */
1550 info->flags |= IEEE80211_TX_STATUS_EOSP |
1551 IEEE80211_TX_CTL_REQ_TX_STATUS;
1555 /* For uAPSD, things are a bit more complicated. If the
1556 * last frame has a QoS header (i.e. is a QoS-data or
1557 * QoS-nulldata frame) then just set the EOSP bit there
1559 * If the frame doesn't have a QoS header (which means
1560 * it should be a bufferable MMPDU) then we can't set
1561 * the EOSP bit in the QoS header; add a QoS-nulldata
1562 * frame to the list to send it after the MMPDU.
1564 * Note that this code is only in the mac80211-release
1565 * code path, we assume that the driver will not buffer
1566 * anything but QoS-data frames, or if it does, will
1567 * create the QoS-nulldata frame by itself if needed.
1569 * Cf. 802.11-2012 10.2.1.10 (c).
1572 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1574 info->flags |= IEEE80211_TX_STATUS_EOSP |
1575 IEEE80211_TX_CTL_REQ_TX_STATUS;
1577 /* The standard isn't completely clear on this
1578 * as it says the more-data bit should be set
1579 * if there are more BUs. The QoS-Null frame
1580 * we're about to send isn't buffered yet, we
1581 * only create it below, but let's pretend it
1582 * was buffered just in case some clients only
1583 * expect more-data=0 when eosp=1.
1585 hdr->frame_control |=
1586 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1593 drv_allow_buffered_frames(local, sta, tids, num,
1596 ieee80211_add_pending_skbs(local, &pending);
1599 ieee80211_send_null_response(
1600 sta, find_highest_prio_tid(tids),
1601 reason, false, false);
1603 sta_info_recalc_tim(sta);
1605 unsigned long tids = sta->txq_buffered_tids & driver_release_tids;
1609 * We need to release a frame that is buffered somewhere in the
1610 * driver ... it'll have to handle that.
1611 * Note that the driver also has to check the number of frames
1612 * on the TIDs we're releasing from - if there are more than
1613 * n_frames it has to set the more-data bit (if we didn't ask
1614 * it to set it anyway due to other buffered frames); if there
1615 * are fewer than n_frames it has to make sure to adjust that
1616 * to allow the service period to end properly.
1618 drv_release_buffered_frames(local, sta, driver_release_tids,
1619 n_frames, reason, more_data);
1622 * Note that we don't recalculate the TIM bit here as it would
1623 * most likely have no effect at all unless the driver told us
1624 * that the TID(s) became empty before returning here from the
1626 * Either way, however, when the driver tells us that the TID(s)
1627 * became empty or we find that a txq became empty, we'll do the
1628 * TIM recalculation.
1631 if (!sta->sta.txq[0])
1634 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1635 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1637 if (!(tids & BIT(tid)) || skb_queue_len(&txqi->queue))
1640 sta_info_recalc_tim(sta);
1646 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1648 u8 ignore_for_response = sta->sta.uapsd_queues;
1651 * If all ACs are delivery-enabled then we should reply
1652 * from any of them, if only some are enabled we reply
1653 * only from the non-enabled ones.
1655 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1656 ignore_for_response = 0;
1658 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1659 IEEE80211_FRAME_RELEASE_PSPOLL);
1662 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1664 int n_frames = sta->sta.max_sp;
1665 u8 delivery_enabled = sta->sta.uapsd_queues;
1668 * If we ever grow support for TSPEC this might happen if
1669 * the TSPEC update from hostapd comes in between a trigger
1670 * frame setting WLAN_STA_UAPSD in the RX path and this
1671 * actually getting called.
1673 if (!delivery_enabled)
1676 switch (sta->sta.max_sp) {
1687 /* XXX: what is a good value? */
1692 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1693 IEEE80211_FRAME_RELEASE_UAPSD);
1696 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1697 struct ieee80211_sta *pubsta, bool block)
1699 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1701 trace_api_sta_block_awake(sta->local, pubsta, block);
1704 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1705 ieee80211_clear_fast_xmit(sta);
1709 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1712 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1713 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1714 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1715 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1716 } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1717 test_sta_flag(sta, WLAN_STA_UAPSD)) {
1718 /* must be asleep in this case */
1719 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1720 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1722 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1723 ieee80211_check_fast_xmit(sta);
1726 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1728 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1730 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1731 struct ieee80211_local *local = sta->local;
1733 trace_api_eosp(local, pubsta);
1735 clear_sta_flag(sta, WLAN_STA_SP);
1737 EXPORT_SYMBOL(ieee80211_sta_eosp);
1739 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
1741 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1742 enum ieee80211_frame_release_type reason;
1745 trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
1747 reason = IEEE80211_FRAME_RELEASE_UAPSD;
1748 more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
1751 ieee80211_send_null_response(sta, tid, reason, false, more_data);
1753 EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
1755 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1756 u8 tid, bool buffered)
1758 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1760 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1763 trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1766 set_bit(tid, &sta->driver_buffered_tids);
1768 clear_bit(tid, &sta->driver_buffered_tids);
1770 sta_info_recalc_tim(sta);
1772 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1775 ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data *sdata)
1777 struct ieee80211_local *local = sdata->local;
1778 bool allow_p2p_go_ps = sdata->vif.p2p;
1779 struct sta_info *sta;
1782 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1783 if (sdata != sta->sdata ||
1784 !test_sta_flag(sta, WLAN_STA_ASSOC))
1786 if (!sta->sta.support_p2p_ps) {
1787 allow_p2p_go_ps = false;
1793 if (allow_p2p_go_ps != sdata->vif.bss_conf.allow_p2p_go_ps) {
1794 sdata->vif.bss_conf.allow_p2p_go_ps = allow_p2p_go_ps;
1795 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_P2P_PS);
1799 int sta_info_move_state(struct sta_info *sta,
1800 enum ieee80211_sta_state new_state)
1804 if (sta->sta_state == new_state)
1807 /* check allowed transitions first */
1809 switch (new_state) {
1810 case IEEE80211_STA_NONE:
1811 if (sta->sta_state != IEEE80211_STA_AUTH)
1814 case IEEE80211_STA_AUTH:
1815 if (sta->sta_state != IEEE80211_STA_NONE &&
1816 sta->sta_state != IEEE80211_STA_ASSOC)
1819 case IEEE80211_STA_ASSOC:
1820 if (sta->sta_state != IEEE80211_STA_AUTH &&
1821 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1824 case IEEE80211_STA_AUTHORIZED:
1825 if (sta->sta_state != IEEE80211_STA_ASSOC)
1829 WARN(1, "invalid state %d", new_state);
1833 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1834 sta->sta.addr, new_state);
1837 * notify the driver before the actual changes so it can
1838 * fail the transition
1840 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1841 int err = drv_sta_state(sta->local, sta->sdata, sta,
1842 sta->sta_state, new_state);
1847 /* reflect the change in all state variables */
1849 switch (new_state) {
1850 case IEEE80211_STA_NONE:
1851 if (sta->sta_state == IEEE80211_STA_AUTH)
1852 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1854 case IEEE80211_STA_AUTH:
1855 if (sta->sta_state == IEEE80211_STA_NONE) {
1856 set_bit(WLAN_STA_AUTH, &sta->_flags);
1857 } else if (sta->sta_state == IEEE80211_STA_ASSOC) {
1858 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1859 ieee80211_recalc_min_chandef(sta->sdata);
1860 if (!sta->sta.support_p2p_ps)
1861 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1864 case IEEE80211_STA_ASSOC:
1865 if (sta->sta_state == IEEE80211_STA_AUTH) {
1866 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1867 ieee80211_recalc_min_chandef(sta->sdata);
1868 if (!sta->sta.support_p2p_ps)
1869 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1870 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1871 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1872 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1873 !sta->sdata->u.vlan.sta))
1874 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1875 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1876 ieee80211_clear_fast_xmit(sta);
1877 ieee80211_clear_fast_rx(sta);
1880 case IEEE80211_STA_AUTHORIZED:
1881 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1882 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1883 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1884 !sta->sdata->u.vlan.sta))
1885 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1886 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1887 ieee80211_check_fast_xmit(sta);
1888 ieee80211_check_fast_rx(sta);
1895 sta->sta_state = new_state;
1900 u8 sta_info_tx_streams(struct sta_info *sta)
1902 struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1905 if (!sta->sta.ht_cap.ht_supported)
1908 if (sta->sta.vht_cap.vht_supported) {
1911 le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1913 for (i = 7; i >= 0; i--)
1914 if ((tx_mcs_map & (0x3 << (i * 2))) !=
1915 IEEE80211_VHT_MCS_NOT_SUPPORTED)
1919 if (ht_cap->mcs.rx_mask[3])
1921 else if (ht_cap->mcs.rx_mask[2])
1923 else if (ht_cap->mcs.rx_mask[1])
1928 if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1931 return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1932 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1935 static void sta_stats_decode_rate(struct ieee80211_local *local, u16 rate,
1936 struct rate_info *rinfo)
1938 rinfo->bw = (rate & STA_STATS_RATE_BW_MASK) >>
1939 STA_STATS_RATE_BW_SHIFT;
1941 if (rate & STA_STATS_RATE_VHT) {
1942 rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
1943 rinfo->mcs = rate & 0xf;
1944 rinfo->nss = (rate & 0xf0) >> 4;
1945 } else if (rate & STA_STATS_RATE_HT) {
1946 rinfo->flags = RATE_INFO_FLAGS_MCS;
1947 rinfo->mcs = rate & 0xff;
1948 } else if (rate & STA_STATS_RATE_LEGACY) {
1949 struct ieee80211_supported_band *sband;
1953 sband = local->hw.wiphy->bands[(rate >> 4) & 0xf];
1954 brate = sband->bitrates[rate & 0xf].bitrate;
1955 if (rinfo->bw == RATE_INFO_BW_5)
1957 else if (rinfo->bw == RATE_INFO_BW_10)
1961 rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
1964 if (rate & STA_STATS_RATE_SGI)
1965 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
1968 static void sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
1970 u16 rate = ACCESS_ONCE(sta->rx_stats.last_rate);
1972 if (rate == STA_STATS_RATE_INVALID)
1975 sta_stats_decode_rate(sta->local, rate, rinfo);
1978 static void sta_set_tidstats(struct sta_info *sta,
1979 struct cfg80211_tid_stats *tidstats,
1982 struct ieee80211_local *local = sta->local;
1984 if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
1988 start = u64_stats_fetch_begin(&sta->rx_stats.syncp);
1989 tidstats->rx_msdu = sta->rx_stats.msdu[tid];
1990 } while (u64_stats_fetch_retry(&sta->rx_stats.syncp, start));
1992 tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
1995 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
1996 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
1997 tidstats->tx_msdu = sta->tx_stats.msdu[tid];
2000 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
2001 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2002 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
2003 tidstats->tx_msdu_retries = sta->status_stats.msdu_retries[tid];
2006 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
2007 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2008 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
2009 tidstats->tx_msdu_failed = sta->status_stats.msdu_failed[tid];
2013 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
2015 struct ieee80211_sub_if_data *sdata = sta->sdata;
2016 struct ieee80211_local *local = sdata->local;
2017 struct rate_control_ref *ref = NULL;
2021 if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2022 ref = local->rate_ctrl;
2024 sinfo->generation = sdata->local->sta_generation;
2026 /* do before driver, so beacon filtering drivers have a
2027 * chance to e.g. just add the number of filtered beacons
2028 * (or just modify the value entirely, of course)
2030 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2031 sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
2033 drv_sta_statistics(local, sdata, &sta->sta, sinfo);
2035 sinfo->filled |= BIT(NL80211_STA_INFO_INACTIVE_TIME) |
2036 BIT(NL80211_STA_INFO_STA_FLAGS) |
2037 BIT(NL80211_STA_INFO_BSS_PARAM) |
2038 BIT(NL80211_STA_INFO_CONNECTED_TIME) |
2039 BIT(NL80211_STA_INFO_RX_DROP_MISC);
2041 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2042 sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
2043 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_LOSS);
2046 sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
2047 sinfo->inactive_time =
2048 jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta));
2050 if (!(sinfo->filled & (BIT(NL80211_STA_INFO_TX_BYTES64) |
2051 BIT(NL80211_STA_INFO_TX_BYTES)))) {
2052 sinfo->tx_bytes = 0;
2053 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2054 sinfo->tx_bytes += sta->tx_stats.bytes[ac];
2055 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BYTES64);
2058 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_PACKETS))) {
2059 sinfo->tx_packets = 0;
2060 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2061 sinfo->tx_packets += sta->tx_stats.packets[ac];
2062 sinfo->filled |= BIT(NL80211_STA_INFO_TX_PACKETS);
2065 if (!(sinfo->filled & (BIT(NL80211_STA_INFO_RX_BYTES64) |
2066 BIT(NL80211_STA_INFO_RX_BYTES)))) {
2070 start = u64_stats_fetch_begin(&sta->rx_stats.syncp);
2071 sinfo->rx_bytes = sta->rx_stats.bytes;
2072 } while (u64_stats_fetch_retry(&sta->rx_stats.syncp, start));
2073 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BYTES64);
2076 if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_PACKETS))) {
2077 sinfo->rx_packets = sta->rx_stats.packets;
2078 sinfo->filled |= BIT(NL80211_STA_INFO_RX_PACKETS);
2081 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_RETRIES))) {
2082 sinfo->tx_retries = sta->status_stats.retry_count;
2083 sinfo->filled |= BIT(NL80211_STA_INFO_TX_RETRIES);
2086 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_FAILED))) {
2087 sinfo->tx_failed = sta->status_stats.retry_failed;
2088 sinfo->filled |= BIT(NL80211_STA_INFO_TX_FAILED);
2091 sinfo->rx_dropped_misc = sta->rx_stats.dropped;
2093 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2094 !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
2095 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_RX) |
2096 BIT(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
2097 sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
2100 if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
2101 ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
2102 if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL))) {
2103 sinfo->signal = (s8)sta->rx_stats.last_signal;
2104 sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL);
2107 if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL_AVG))) {
2109 -ewma_signal_read(&sta->rx_stats_avg.signal);
2110 sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL_AVG);
2114 if (sta->rx_stats.chains &&
2115 !(sinfo->filled & (BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
2116 BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
2117 sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
2118 BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
2120 sinfo->chains = sta->rx_stats.chains;
2121 for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
2122 sinfo->chain_signal[i] =
2123 sta->rx_stats.chain_signal_last[i];
2124 sinfo->chain_signal_avg[i] =
2125 -ewma_signal_read(&sta->rx_stats_avg.chain_signal[i]);
2129 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_BITRATE))) {
2130 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate,
2132 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BITRATE);
2135 if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_BITRATE))) {
2136 sta_set_rate_info_rx(sta, &sinfo->rxrate);
2137 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BITRATE);
2140 sinfo->filled |= BIT(NL80211_STA_INFO_TID_STATS);
2141 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
2142 struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i];
2144 sta_set_tidstats(sta, tidstats, i);
2147 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2148 #ifdef CONFIG_MAC80211_MESH
2149 sinfo->filled |= BIT(NL80211_STA_INFO_LLID) |
2150 BIT(NL80211_STA_INFO_PLID) |
2151 BIT(NL80211_STA_INFO_PLINK_STATE) |
2152 BIT(NL80211_STA_INFO_LOCAL_PM) |
2153 BIT(NL80211_STA_INFO_PEER_PM) |
2154 BIT(NL80211_STA_INFO_NONPEER_PM);
2156 sinfo->llid = sta->mesh->llid;
2157 sinfo->plid = sta->mesh->plid;
2158 sinfo->plink_state = sta->mesh->plink_state;
2159 if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
2160 sinfo->filled |= BIT(NL80211_STA_INFO_T_OFFSET);
2161 sinfo->t_offset = sta->mesh->t_offset;
2163 sinfo->local_pm = sta->mesh->local_pm;
2164 sinfo->peer_pm = sta->mesh->peer_pm;
2165 sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
2169 sinfo->bss_param.flags = 0;
2170 if (sdata->vif.bss_conf.use_cts_prot)
2171 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
2172 if (sdata->vif.bss_conf.use_short_preamble)
2173 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
2174 if (sdata->vif.bss_conf.use_short_slot)
2175 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
2176 sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
2177 sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
2179 sinfo->sta_flags.set = 0;
2180 sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
2181 BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
2182 BIT(NL80211_STA_FLAG_WME) |
2183 BIT(NL80211_STA_FLAG_MFP) |
2184 BIT(NL80211_STA_FLAG_AUTHENTICATED) |
2185 BIT(NL80211_STA_FLAG_ASSOCIATED) |
2186 BIT(NL80211_STA_FLAG_TDLS_PEER);
2187 if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2188 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
2189 if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
2190 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
2192 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
2193 if (test_sta_flag(sta, WLAN_STA_MFP))
2194 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
2195 if (test_sta_flag(sta, WLAN_STA_AUTH))
2196 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
2197 if (test_sta_flag(sta, WLAN_STA_ASSOC))
2198 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
2199 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
2200 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
2202 /* check if the driver has a SW RC implementation */
2203 if (ref && ref->ops->get_expected_throughput)
2204 thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
2206 thr = drv_get_expected_throughput(local, &sta->sta);
2209 sinfo->filled |= BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
2210 sinfo->expected_throughput = thr;
2214 unsigned long ieee80211_sta_last_active(struct sta_info *sta)
2216 if (time_after(sta->rx_stats.last_rx, sta->status_stats.last_ack))
2217 return sta->rx_stats.last_rx;
2218 return sta->status_stats.last_ack;