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- /*
- * Copyright 2002-2005, Instant802 Networks, Inc.
- * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
- * Copyright 2013-2014 Intel Mobile Communications GmbH
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/etherdevice.h>
- #include <linux/netdevice.h>
- #include <linux/types.h>
- #include <linux/slab.h>
- #include <linux/skbuff.h>
- #include <linux/if_arp.h>
- #include <linux/timer.h>
- #include <linux/rtnetlink.h>
- #include <net/mac80211.h>
- #include "ieee80211_i.h"
- #include "driver-ops.h"
- #include "rate.h"
- #include "sta_info.h"
- #include "debugfs_sta.h"
- #include "mesh.h"
- #include "wme.h"
- /**
- * DOC: STA information lifetime rules
- *
- * STA info structures (&struct sta_info) are managed in a hash table
- * for faster lookup and a list for iteration. They are managed using
- * RCU, i.e. access to the list and hash table is protected by RCU.
- *
- * Upon allocating a STA info structure with sta_info_alloc(), the caller
- * owns that structure. It must then insert it into the hash table using
- * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
- * case (which acquires an rcu read section but must not be called from
- * within one) will the pointer still be valid after the call. Note that
- * the caller may not do much with the STA info before inserting it, in
- * particular, it may not start any mesh peer link management or add
- * encryption keys.
- *
- * When the insertion fails (sta_info_insert()) returns non-zero), the
- * structure will have been freed by sta_info_insert()!
- *
- * Station entries are added by mac80211 when you establish a link with a
- * peer. This means different things for the different type of interfaces
- * we support. For a regular station this mean we add the AP sta when we
- * receive an association response from the AP. For IBSS this occurs when
- * get to know about a peer on the same IBSS. For WDS we add the sta for
- * the peer immediately upon device open. When using AP mode we add stations
- * for each respective station upon request from userspace through nl80211.
- *
- * In order to remove a STA info structure, various sta_info_destroy_*()
- * calls are available.
- *
- * There is no concept of ownership on a STA entry, each structure is
- * owned by the global hash table/list until it is removed. All users of
- * the structure need to be RCU protected so that the structure won't be
- * freed before they are done using it.
- */
- static const struct rhashtable_params sta_rht_params = {
- .nelem_hint = 3, /* start small */
- .automatic_shrinking = true,
- .head_offset = offsetof(struct sta_info, hash_node),
- .key_offset = offsetof(struct sta_info, addr),
- .key_len = ETH_ALEN,
- .hashfn = sta_addr_hash,
- .max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
- };
- /* Caller must hold local->sta_mtx */
- static int sta_info_hash_del(struct ieee80211_local *local,
- struct sta_info *sta)
- {
- return rhashtable_remove_fast(&local->sta_hash, &sta->hash_node,
- sta_rht_params);
- }
- static void __cleanup_single_sta(struct sta_info *sta)
- {
- int ac, i;
- struct tid_ampdu_tx *tid_tx;
- struct ieee80211_sub_if_data *sdata = sta->sdata;
- struct ieee80211_local *local = sdata->local;
- struct ps_data *ps;
- if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
- test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
- test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
- if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
- sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
- ps = &sdata->bss->ps;
- else if (ieee80211_vif_is_mesh(&sdata->vif))
- ps = &sdata->u.mesh.ps;
- else
- return;
- clear_sta_flag(sta, WLAN_STA_PS_STA);
- clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
- clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
- atomic_dec(&ps->num_sta_ps);
- }
- if (sta->sta.txq[0]) {
- for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
- struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
- int n = skb_queue_len(&txqi->queue);
- ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
- atomic_sub(n, &sdata->txqs_len[txqi->txq.ac]);
- }
- }
- for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
- local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
- ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
- ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
- }
- if (ieee80211_vif_is_mesh(&sdata->vif))
- mesh_sta_cleanup(sta);
- cancel_work_sync(&sta->drv_deliver_wk);
- /*
- * Destroy aggregation state here. It would be nice to wait for the
- * driver to finish aggregation stop and then clean up, but for now
- * drivers have to handle aggregation stop being requested, followed
- * directly by station destruction.
- */
- for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
- kfree(sta->ampdu_mlme.tid_start_tx[i]);
- tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
- if (!tid_tx)
- continue;
- ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
- kfree(tid_tx);
- }
- }
- static void cleanup_single_sta(struct sta_info *sta)
- {
- struct ieee80211_sub_if_data *sdata = sta->sdata;
- struct ieee80211_local *local = sdata->local;
- __cleanup_single_sta(sta);
- sta_info_free(local, sta);
- }
- /* protected by RCU */
- struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
- const u8 *addr)
- {
- struct ieee80211_local *local = sdata->local;
- struct sta_info *sta;
- struct rhash_head *tmp;
- const struct bucket_table *tbl;
- rcu_read_lock();
- tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
- for_each_sta_info(local, tbl, addr, sta, tmp) {
- if (sta->sdata == sdata) {
- rcu_read_unlock();
- /* this is safe as the caller must already hold
- * another rcu read section or the mutex
- */
- return sta;
- }
- }
- rcu_read_unlock();
- return NULL;
- }
- /*
- * Get sta info either from the specified interface
- * or from one of its vlans
- */
- struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
- const u8 *addr)
- {
- struct ieee80211_local *local = sdata->local;
- struct sta_info *sta;
- struct rhash_head *tmp;
- const struct bucket_table *tbl;
- rcu_read_lock();
- tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
- for_each_sta_info(local, tbl, addr, sta, tmp) {
- if (sta->sdata == sdata ||
- (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
- rcu_read_unlock();
- /* this is safe as the caller must already hold
- * another rcu read section or the mutex
- */
- return sta;
- }
- }
- rcu_read_unlock();
- return NULL;
- }
- struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
- int idx)
- {
- struct ieee80211_local *local = sdata->local;
- struct sta_info *sta;
- int i = 0;
- list_for_each_entry_rcu(sta, &local->sta_list, list) {
- if (sdata != sta->sdata)
- continue;
- if (i < idx) {
- ++i;
- continue;
- }
- return sta;
- }
- return NULL;
- }
- /**
- * sta_info_free - free STA
- *
- * @local: pointer to the global information
- * @sta: STA info to free
- *
- * This function must undo everything done by sta_info_alloc()
- * that may happen before sta_info_insert(). It may only be
- * called when sta_info_insert() has not been attempted (and
- * if that fails, the station is freed anyway.)
- */
- void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
- {
- if (sta->rate_ctrl)
- rate_control_free_sta(sta);
- sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
- if (sta->sta.txq[0])
- kfree(to_txq_info(sta->sta.txq[0]));
- kfree(rcu_dereference_raw(sta->sta.rates));
- #ifdef CONFIG_MAC80211_MESH
- kfree(sta->mesh);
- #endif
- kfree(sta);
- }
- /* Caller must hold local->sta_mtx */
- static int sta_info_hash_add(struct ieee80211_local *local,
- struct sta_info *sta)
- {
- return rhashtable_insert_fast(&local->sta_hash, &sta->hash_node,
- sta_rht_params);
- }
- static void sta_deliver_ps_frames(struct work_struct *wk)
- {
- struct sta_info *sta;
- sta = container_of(wk, struct sta_info, drv_deliver_wk);
- if (sta->dead)
- return;
- local_bh_disable();
- if (!test_sta_flag(sta, WLAN_STA_PS_STA))
- ieee80211_sta_ps_deliver_wakeup(sta);
- else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
- ieee80211_sta_ps_deliver_poll_response(sta);
- else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
- ieee80211_sta_ps_deliver_uapsd(sta);
- local_bh_enable();
- }
- static int sta_prepare_rate_control(struct ieee80211_local *local,
- struct sta_info *sta, gfp_t gfp)
- {
- if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
- return 0;
- sta->rate_ctrl = local->rate_ctrl;
- sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
- sta, gfp);
- if (!sta->rate_ctrl_priv)
- return -ENOMEM;
- return 0;
- }
- struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
- const u8 *addr, gfp_t gfp)
- {
- struct ieee80211_local *local = sdata->local;
- struct ieee80211_hw *hw = &local->hw;
- struct sta_info *sta;
- int i;
- sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
- if (!sta)
- return NULL;
- spin_lock_init(&sta->lock);
- spin_lock_init(&sta->ps_lock);
- INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
- INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
- mutex_init(&sta->ampdu_mlme.mtx);
- #ifdef CONFIG_MAC80211_MESH
- if (ieee80211_vif_is_mesh(&sdata->vif)) {
- sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
- if (!sta->mesh)
- goto free;
- spin_lock_init(&sta->mesh->plink_lock);
- if (ieee80211_vif_is_mesh(&sdata->vif) &&
- !sdata->u.mesh.user_mpm)
- init_timer(&sta->mesh->plink_timer);
- sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
- }
- #endif
- memcpy(sta->addr, addr, ETH_ALEN);
- memcpy(sta->sta.addr, addr, ETH_ALEN);
- sta->sta.max_rx_aggregation_subframes =
- local->hw.max_rx_aggregation_subframes;
- sta->local = local;
- sta->sdata = sdata;
- sta->rx_stats.last_rx = jiffies;
- sta->sta_state = IEEE80211_STA_NONE;
- /* Mark TID as unreserved */
- sta->reserved_tid = IEEE80211_TID_UNRESERVED;
- sta->last_connected = ktime_get_seconds();
- ewma_signal_init(&sta->rx_stats.avg_signal);
- for (i = 0; i < ARRAY_SIZE(sta->rx_stats.chain_signal_avg); i++)
- ewma_signal_init(&sta->rx_stats.chain_signal_avg[i]);
- if (local->ops->wake_tx_queue) {
- void *txq_data;
- int size = sizeof(struct txq_info) +
- ALIGN(hw->txq_data_size, sizeof(void *));
- txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
- if (!txq_data)
- goto free;
- for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
- struct txq_info *txq = txq_data + i * size;
- ieee80211_init_tx_queue(sdata, sta, txq, i);
- }
- }
- if (sta_prepare_rate_control(local, sta, gfp))
- goto free_txq;
- for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
- /*
- * timer_to_tid must be initialized with identity mapping
- * to enable session_timer's data differentiation. See
- * sta_rx_agg_session_timer_expired for usage.
- */
- sta->timer_to_tid[i] = i;
- }
- for (i = 0; i < IEEE80211_NUM_ACS; i++) {
- skb_queue_head_init(&sta->ps_tx_buf[i]);
- skb_queue_head_init(&sta->tx_filtered[i]);
- }
- for (i = 0; i < IEEE80211_NUM_TIDS; i++)
- sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
- sta->sta.smps_mode = IEEE80211_SMPS_OFF;
- if (sdata->vif.type == NL80211_IFTYPE_AP ||
- sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
- struct ieee80211_supported_band *sband =
- hw->wiphy->bands[ieee80211_get_sdata_band(sdata)];
- u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
- IEEE80211_HT_CAP_SM_PS_SHIFT;
- /*
- * Assume that hostapd advertises our caps in the beacon and
- * this is the known_smps_mode for a station that just assciated
- */
- switch (smps) {
- case WLAN_HT_SMPS_CONTROL_DISABLED:
- sta->known_smps_mode = IEEE80211_SMPS_OFF;
- break;
- case WLAN_HT_SMPS_CONTROL_STATIC:
- sta->known_smps_mode = IEEE80211_SMPS_STATIC;
- break;
- case WLAN_HT_SMPS_CONTROL_DYNAMIC:
- sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
- break;
- default:
- WARN_ON(1);
- }
- }
- sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
- return sta;
- free_txq:
- if (sta->sta.txq[0])
- kfree(to_txq_info(sta->sta.txq[0]));
- free:
- #ifdef CONFIG_MAC80211_MESH
- kfree(sta->mesh);
- #endif
- kfree(sta);
- return NULL;
- }
- static int sta_info_insert_check(struct sta_info *sta)
- {
- struct ieee80211_sub_if_data *sdata = sta->sdata;
- /*
- * Can't be a WARN_ON because it can be triggered through a race:
- * something inserts a STA (on one CPU) without holding the RTNL
- * and another CPU turns off the net device.
- */
- if (unlikely(!ieee80211_sdata_running(sdata)))
- return -ENETDOWN;
- if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
- is_multicast_ether_addr(sta->sta.addr)))
- return -EINVAL;
- return 0;
- }
- static int sta_info_insert_drv_state(struct ieee80211_local *local,
- struct ieee80211_sub_if_data *sdata,
- struct sta_info *sta)
- {
- enum ieee80211_sta_state state;
- int err = 0;
- for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
- err = drv_sta_state(local, sdata, sta, state, state + 1);
- if (err)
- break;
- }
- if (!err) {
- /*
- * Drivers using legacy sta_add/sta_remove callbacks only
- * get uploaded set to true after sta_add is called.
- */
- if (!local->ops->sta_add)
- sta->uploaded = true;
- return 0;
- }
- if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
- sdata_info(sdata,
- "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
- sta->sta.addr, state + 1, err);
- err = 0;
- }
- /* unwind on error */
- for (; state > IEEE80211_STA_NOTEXIST; state--)
- WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
- return err;
- }
- /*
- * should be called with sta_mtx locked
- * this function replaces the mutex lock
- * with a RCU lock
- */
- static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
- {
- struct ieee80211_local *local = sta->local;
- struct ieee80211_sub_if_data *sdata = sta->sdata;
- struct station_info *sinfo;
- int err = 0;
- lockdep_assert_held(&local->sta_mtx);
- sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
- if (!sinfo) {
- err = -ENOMEM;
- goto out_err;
- }
- /* check if STA exists already */
- if (sta_info_get_bss(sdata, sta->sta.addr)) {
- err = -EEXIST;
- goto out_err;
- }
- local->num_sta++;
- local->sta_generation++;
- smp_mb();
- /* simplify things and don't accept BA sessions yet */
- set_sta_flag(sta, WLAN_STA_BLOCK_BA);
- /* make the station visible */
- err = sta_info_hash_add(local, sta);
- if (err)
- goto out_drop_sta;
- list_add_tail_rcu(&sta->list, &local->sta_list);
- /* notify driver */
- err = sta_info_insert_drv_state(local, sdata, sta);
- if (err)
- goto out_remove;
- set_sta_flag(sta, WLAN_STA_INSERTED);
- /* accept BA sessions now */
- clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
- ieee80211_recalc_min_chandef(sdata);
- ieee80211_sta_debugfs_add(sta);
- rate_control_add_sta_debugfs(sta);
- sinfo->generation = local->sta_generation;
- cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
- kfree(sinfo);
- sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
- /* move reference to rcu-protected */
- rcu_read_lock();
- mutex_unlock(&local->sta_mtx);
- if (ieee80211_vif_is_mesh(&sdata->vif))
- mesh_accept_plinks_update(sdata);
- return 0;
- out_remove:
- sta_info_hash_del(local, sta);
- list_del_rcu(&sta->list);
- out_drop_sta:
- local->num_sta--;
- synchronize_net();
- __cleanup_single_sta(sta);
- out_err:
- mutex_unlock(&local->sta_mtx);
- rcu_read_lock();
- return err;
- }
- int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
- {
- struct ieee80211_local *local = sta->local;
- int err;
- might_sleep();
- err = sta_info_insert_check(sta);
- if (err) {
- rcu_read_lock();
- goto out_free;
- }
- mutex_lock(&local->sta_mtx);
- err = sta_info_insert_finish(sta);
- if (err)
- goto out_free;
- return 0;
- out_free:
- sta_info_free(local, sta);
- return err;
- }
- int sta_info_insert(struct sta_info *sta)
- {
- int err = sta_info_insert_rcu(sta);
- rcu_read_unlock();
- return err;
- }
- static inline void __bss_tim_set(u8 *tim, u16 id)
- {
- /*
- * This format has been mandated by the IEEE specifications,
- * so this line may not be changed to use the __set_bit() format.
- */
- tim[id / 8] |= (1 << (id % 8));
- }
- static inline void __bss_tim_clear(u8 *tim, u16 id)
- {
- /*
- * This format has been mandated by the IEEE specifications,
- * so this line may not be changed to use the __clear_bit() format.
- */
- tim[id / 8] &= ~(1 << (id % 8));
- }
- static inline bool __bss_tim_get(u8 *tim, u16 id)
- {
- /*
- * This format has been mandated by the IEEE specifications,
- * so this line may not be changed to use the test_bit() format.
- */
- return tim[id / 8] & (1 << (id % 8));
- }
- static unsigned long ieee80211_tids_for_ac(int ac)
- {
- /* If we ever support TIDs > 7, this obviously needs to be adjusted */
- switch (ac) {
- case IEEE80211_AC_VO:
- return BIT(6) | BIT(7);
- case IEEE80211_AC_VI:
- return BIT(4) | BIT(5);
- case IEEE80211_AC_BE:
- return BIT(0) | BIT(3);
- case IEEE80211_AC_BK:
- return BIT(1) | BIT(2);
- default:
- WARN_ON(1);
- return 0;
- }
- }
- static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
- {
- struct ieee80211_local *local = sta->local;
- struct ps_data *ps;
- bool indicate_tim = false;
- u8 ignore_for_tim = sta->sta.uapsd_queues;
- int ac;
- u16 id = sta->sta.aid;
- if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
- sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
- if (WARN_ON_ONCE(!sta->sdata->bss))
- return;
- ps = &sta->sdata->bss->ps;
- #ifdef CONFIG_MAC80211_MESH
- } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
- ps = &sta->sdata->u.mesh.ps;
- #endif
- } else {
- return;
- }
- /* No need to do anything if the driver does all */
- if (ieee80211_hw_check(&local->hw, AP_LINK_PS) && !local->ops->set_tim)
- return;
- if (sta->dead)
- goto done;
- /*
- * If all ACs are delivery-enabled then we should build
- * the TIM bit for all ACs anyway; if only some are then
- * we ignore those and build the TIM bit using only the
- * non-enabled ones.
- */
- if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
- ignore_for_tim = 0;
- if (ignore_pending)
- ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
- for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
- unsigned long tids;
- if (ignore_for_tim & BIT(ac))
- continue;
- indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
- !skb_queue_empty(&sta->ps_tx_buf[ac]);
- if (indicate_tim)
- break;
- tids = ieee80211_tids_for_ac(ac);
- indicate_tim |=
- sta->driver_buffered_tids & tids;
- indicate_tim |=
- sta->txq_buffered_tids & tids;
- }
- done:
- spin_lock_bh(&local->tim_lock);
- if (indicate_tim == __bss_tim_get(ps->tim, id))
- goto out_unlock;
- if (indicate_tim)
- __bss_tim_set(ps->tim, id);
- else
- __bss_tim_clear(ps->tim, id);
- if (local->ops->set_tim && !WARN_ON(sta->dead)) {
- local->tim_in_locked_section = true;
- drv_set_tim(local, &sta->sta, indicate_tim);
- local->tim_in_locked_section = false;
- }
- out_unlock:
- spin_unlock_bh(&local->tim_lock);
- }
- void sta_info_recalc_tim(struct sta_info *sta)
- {
- __sta_info_recalc_tim(sta, false);
- }
- static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
- {
- struct ieee80211_tx_info *info;
- int timeout;
- if (!skb)
- return false;
- info = IEEE80211_SKB_CB(skb);
- /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
- timeout = (sta->listen_interval *
- sta->sdata->vif.bss_conf.beacon_int *
- 32 / 15625) * HZ;
- if (timeout < STA_TX_BUFFER_EXPIRE)
- timeout = STA_TX_BUFFER_EXPIRE;
- return time_after(jiffies, info->control.jiffies + timeout);
- }
- static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
- struct sta_info *sta, int ac)
- {
- unsigned long flags;
- struct sk_buff *skb;
- /*
- * First check for frames that should expire on the filtered
- * queue. Frames here were rejected by the driver and are on
- * a separate queue to avoid reordering with normal PS-buffered
- * frames. They also aren't accounted for right now in the
- * total_ps_buffered counter.
- */
- for (;;) {
- spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
- skb = skb_peek(&sta->tx_filtered[ac]);
- if (sta_info_buffer_expired(sta, skb))
- skb = __skb_dequeue(&sta->tx_filtered[ac]);
- else
- skb = NULL;
- spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
- /*
- * Frames are queued in order, so if this one
- * hasn't expired yet we can stop testing. If
- * we actually reached the end of the queue we
- * also need to stop, of course.
- */
- if (!skb)
- break;
- ieee80211_free_txskb(&local->hw, skb);
- }
- /*
- * Now also check the normal PS-buffered queue, this will
- * only find something if the filtered queue was emptied
- * since the filtered frames are all before the normal PS
- * buffered frames.
- */
- for (;;) {
- spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
- skb = skb_peek(&sta->ps_tx_buf[ac]);
- if (sta_info_buffer_expired(sta, skb))
- skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
- else
- skb = NULL;
- spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
- /*
- * frames are queued in order, so if this one
- * hasn't expired yet (or we reached the end of
- * the queue) we can stop testing
- */
- if (!skb)
- break;
- local->total_ps_buffered--;
- ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
- sta->sta.addr);
- ieee80211_free_txskb(&local->hw, skb);
- }
- /*
- * Finally, recalculate the TIM bit for this station -- it might
- * now be clear because the station was too slow to retrieve its
- * frames.
- */
- sta_info_recalc_tim(sta);
- /*
- * Return whether there are any frames still buffered, this is
- * used to check whether the cleanup timer still needs to run,
- * if there are no frames we don't need to rearm the timer.
- */
- return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
- skb_queue_empty(&sta->tx_filtered[ac]));
- }
- static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
- struct sta_info *sta)
- {
- bool have_buffered = false;
- int ac;
- /* This is only necessary for stations on BSS/MBSS interfaces */
- if (!sta->sdata->bss &&
- !ieee80211_vif_is_mesh(&sta->sdata->vif))
- return false;
- for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
- have_buffered |=
- sta_info_cleanup_expire_buffered_ac(local, sta, ac);
- return have_buffered;
- }
- static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
- {
- struct ieee80211_local *local;
- struct ieee80211_sub_if_data *sdata;
- int ret;
- might_sleep();
- if (!sta)
- return -ENOENT;
- local = sta->local;
- sdata = sta->sdata;
- lockdep_assert_held(&local->sta_mtx);
- /*
- * Before removing the station from the driver and
- * rate control, it might still start new aggregation
- * sessions -- block that to make sure the tear-down
- * will be sufficient.
- */
- set_sta_flag(sta, WLAN_STA_BLOCK_BA);
- ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
- ret = sta_info_hash_del(local, sta);
- if (WARN_ON(ret))
- return ret;
- /*
- * for TDLS peers, make sure to return to the base channel before
- * removal.
- */
- if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
- drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
- clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
- }
- list_del_rcu(&sta->list);
- drv_sta_pre_rcu_remove(local, sta->sdata, sta);
- if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
- rcu_access_pointer(sdata->u.vlan.sta) == sta)
- RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
- return 0;
- }
- static void __sta_info_destroy_part2(struct sta_info *sta)
- {
- struct ieee80211_local *local = sta->local;
- struct ieee80211_sub_if_data *sdata = sta->sdata;
- struct station_info *sinfo;
- int ret;
- /*
- * NOTE: This assumes at least synchronize_net() was done
- * after _part1 and before _part2!
- */
- might_sleep();
- lockdep_assert_held(&local->sta_mtx);
- /* now keys can no longer be reached */
- ieee80211_free_sta_keys(local, sta);
- /* disable TIM bit - last chance to tell driver */
- __sta_info_recalc_tim(sta, true);
- sta->dead = true;
- local->num_sta--;
- local->sta_generation++;
- while (sta->sta_state > IEEE80211_STA_NONE) {
- ret = sta_info_move_state(sta, sta->sta_state - 1);
- if (ret) {
- WARN_ON_ONCE(1);
- break;
- }
- }
- if (sta->uploaded) {
- ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
- IEEE80211_STA_NOTEXIST);
- WARN_ON_ONCE(ret != 0);
- }
- sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
- sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
- if (sinfo)
- sta_set_sinfo(sta, sinfo);
- cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
- kfree(sinfo);
- rate_control_remove_sta_debugfs(sta);
- ieee80211_sta_debugfs_remove(sta);
- ieee80211_recalc_min_chandef(sdata);
- cleanup_single_sta(sta);
- }
- int __must_check __sta_info_destroy(struct sta_info *sta)
- {
- int err = __sta_info_destroy_part1(sta);
- if (err)
- return err;
- synchronize_net();
- __sta_info_destroy_part2(sta);
- return 0;
- }
- int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
- {
- struct sta_info *sta;
- int ret;
- mutex_lock(&sdata->local->sta_mtx);
- sta = sta_info_get(sdata, addr);
- ret = __sta_info_destroy(sta);
- mutex_unlock(&sdata->local->sta_mtx);
- return ret;
- }
- int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
- const u8 *addr)
- {
- struct sta_info *sta;
- int ret;
- mutex_lock(&sdata->local->sta_mtx);
- sta = sta_info_get_bss(sdata, addr);
- ret = __sta_info_destroy(sta);
- mutex_unlock(&sdata->local->sta_mtx);
- return ret;
- }
- static void sta_info_cleanup(unsigned long data)
- {
- struct ieee80211_local *local = (struct ieee80211_local *) data;
- struct sta_info *sta;
- bool timer_needed = false;
- rcu_read_lock();
- list_for_each_entry_rcu(sta, &local->sta_list, list)
- if (sta_info_cleanup_expire_buffered(local, sta))
- timer_needed = true;
- rcu_read_unlock();
- if (local->quiescing)
- return;
- if (!timer_needed)
- return;
- mod_timer(&local->sta_cleanup,
- round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
- }
- u32 sta_addr_hash(const void *key, u32 length, u32 seed)
- {
- return jhash(key, ETH_ALEN, seed);
- }
- int sta_info_init(struct ieee80211_local *local)
- {
- int err;
- err = rhashtable_init(&local->sta_hash, &sta_rht_params);
- if (err)
- return err;
- spin_lock_init(&local->tim_lock);
- mutex_init(&local->sta_mtx);
- INIT_LIST_HEAD(&local->sta_list);
- setup_timer(&local->sta_cleanup, sta_info_cleanup,
- (unsigned long)local);
- return 0;
- }
- void sta_info_stop(struct ieee80211_local *local)
- {
- del_timer_sync(&local->sta_cleanup);
- rhashtable_destroy(&local->sta_hash);
- }
- int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
- {
- struct ieee80211_local *local = sdata->local;
- struct sta_info *sta, *tmp;
- LIST_HEAD(free_list);
- int ret = 0;
- might_sleep();
- WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
- WARN_ON(vlans && !sdata->bss);
- mutex_lock(&local->sta_mtx);
- list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
- if (sdata == sta->sdata ||
- (vlans && sdata->bss == sta->sdata->bss)) {
- if (!WARN_ON(__sta_info_destroy_part1(sta)))
- list_add(&sta->free_list, &free_list);
- ret++;
- }
- }
- if (!list_empty(&free_list)) {
- synchronize_net();
- list_for_each_entry_safe(sta, tmp, &free_list, free_list)
- __sta_info_destroy_part2(sta);
- }
- mutex_unlock(&local->sta_mtx);
- return ret;
- }
- void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
- unsigned long exp_time)
- {
- struct ieee80211_local *local = sdata->local;
- struct sta_info *sta, *tmp;
- mutex_lock(&local->sta_mtx);
- list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
- if (sdata != sta->sdata)
- continue;
- if (time_after(jiffies, sta->rx_stats.last_rx + exp_time)) {
- sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
- sta->sta.addr);
- if (ieee80211_vif_is_mesh(&sdata->vif) &&
- test_sta_flag(sta, WLAN_STA_PS_STA))
- atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
- WARN_ON(__sta_info_destroy(sta));
- }
- }
- mutex_unlock(&local->sta_mtx);
- }
- struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
- const u8 *addr,
- const u8 *localaddr)
- {
- struct ieee80211_local *local = hw_to_local(hw);
- struct sta_info *sta;
- struct rhash_head *tmp;
- const struct bucket_table *tbl;
- tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
- /*
- * Just return a random station if localaddr is NULL
- * ... first in list.
- */
- for_each_sta_info(local, tbl, addr, sta, tmp) {
- if (localaddr &&
- !ether_addr_equal(sta->sdata->vif.addr, localaddr))
- continue;
- if (!sta->uploaded)
- return NULL;
- return &sta->sta;
- }
- return NULL;
- }
- EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
- struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
- const u8 *addr)
- {
- struct sta_info *sta;
- if (!vif)
- return NULL;
- sta = sta_info_get_bss(vif_to_sdata(vif), addr);
- if (!sta)
- return NULL;
- if (!sta->uploaded)
- return NULL;
- return &sta->sta;
- }
- EXPORT_SYMBOL(ieee80211_find_sta);
- /* powersave support code */
- void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
- {
- struct ieee80211_sub_if_data *sdata = sta->sdata;
- struct ieee80211_local *local = sdata->local;
- struct sk_buff_head pending;
- int filtered = 0, buffered = 0, ac, i;
- unsigned long flags;
- struct ps_data *ps;
- if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
- sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
- u.ap);
- if (sdata->vif.type == NL80211_IFTYPE_AP)
- ps = &sdata->bss->ps;
- else if (ieee80211_vif_is_mesh(&sdata->vif))
- ps = &sdata->u.mesh.ps;
- else
- return;
- clear_sta_flag(sta, WLAN_STA_SP);
- BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
- sta->driver_buffered_tids = 0;
- sta->txq_buffered_tids = 0;
- if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
- drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
- if (sta->sta.txq[0]) {
- for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
- struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
- if (!skb_queue_len(&txqi->queue))
- continue;
- drv_wake_tx_queue(local, txqi);
- }
- }
- skb_queue_head_init(&pending);
- /* sync with ieee80211_tx_h_unicast_ps_buf */
- spin_lock(&sta->ps_lock);
- /* Send all buffered frames to the station */
- for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
- int count = skb_queue_len(&pending), tmp;
- spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
- skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
- spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
- tmp = skb_queue_len(&pending);
- filtered += tmp - count;
- count = tmp;
- spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
- skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
- spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
- tmp = skb_queue_len(&pending);
- buffered += tmp - count;
- }
- ieee80211_add_pending_skbs(local, &pending);
- /* now we're no longer in the deliver code */
- clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
- /* The station might have polled and then woken up before we responded,
- * so clear these flags now to avoid them sticking around.
- */
- clear_sta_flag(sta, WLAN_STA_PSPOLL);
- clear_sta_flag(sta, WLAN_STA_UAPSD);
- spin_unlock(&sta->ps_lock);
- atomic_dec(&ps->num_sta_ps);
- /* This station just woke up and isn't aware of our SMPS state */
- if (!ieee80211_vif_is_mesh(&sdata->vif) &&
- !ieee80211_smps_is_restrictive(sta->known_smps_mode,
- sdata->smps_mode) &&
- sta->known_smps_mode != sdata->bss->req_smps &&
- sta_info_tx_streams(sta) != 1) {
- ht_dbg(sdata,
- "%pM just woke up and MIMO capable - update SMPS\n",
- sta->sta.addr);
- ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
- sta->sta.addr,
- sdata->vif.bss_conf.bssid);
- }
- local->total_ps_buffered -= buffered;
- sta_info_recalc_tim(sta);
- ps_dbg(sdata,
- "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
- sta->sta.addr, sta->sta.aid, filtered, buffered);
- ieee80211_check_fast_xmit(sta);
- }
- static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
- struct sta_info *sta, int tid,
- enum ieee80211_frame_release_type reason,
- bool call_driver)
- {
- struct ieee80211_local *local = sdata->local;
- struct ieee80211_qos_hdr *nullfunc;
- struct sk_buff *skb;
- int size = sizeof(*nullfunc);
- __le16 fc;
- bool qos = sta->sta.wme;
- struct ieee80211_tx_info *info;
- struct ieee80211_chanctx_conf *chanctx_conf;
- if (qos) {
- fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
- IEEE80211_STYPE_QOS_NULLFUNC |
- IEEE80211_FCTL_FROMDS);
- } else {
- size -= 2;
- fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
- IEEE80211_STYPE_NULLFUNC |
- IEEE80211_FCTL_FROMDS);
- }
- skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
- if (!skb)
- return;
- skb_reserve(skb, local->hw.extra_tx_headroom);
- nullfunc = (void *) skb_put(skb, size);
- nullfunc->frame_control = fc;
- nullfunc->duration_id = 0;
- memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
- memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
- memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
- nullfunc->seq_ctrl = 0;
- skb->priority = tid;
- skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
- if (qos) {
- nullfunc->qos_ctrl = cpu_to_le16(tid);
- if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
- nullfunc->qos_ctrl |=
- cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
- }
- info = IEEE80211_SKB_CB(skb);
- /*
- * Tell TX path to send this frame even though the
- * STA may still remain is PS mode after this frame
- * exchange. Also set EOSP to indicate this packet
- * ends the poll/service period.
- */
- info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
- IEEE80211_TX_STATUS_EOSP |
- IEEE80211_TX_CTL_REQ_TX_STATUS;
- info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
- if (call_driver)
- drv_allow_buffered_frames(local, sta, BIT(tid), 1,
- reason, false);
- skb->dev = sdata->dev;
- rcu_read_lock();
- chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
- if (WARN_ON(!chanctx_conf)) {
- rcu_read_unlock();
- kfree_skb(skb);
- return;
- }
- info->band = chanctx_conf->def.chan->band;
- ieee80211_xmit(sdata, sta, skb);
- rcu_read_unlock();
- }
- static int find_highest_prio_tid(unsigned long tids)
- {
- /* lower 3 TIDs aren't ordered perfectly */
- if (tids & 0xF8)
- return fls(tids) - 1;
- /* TID 0 is BE just like TID 3 */
- if (tids & BIT(0))
- return 0;
- return fls(tids) - 1;
- }
- static void
- ieee80211_sta_ps_deliver_response(struct sta_info *sta,
- int n_frames, u8 ignored_acs,
- enum ieee80211_frame_release_type reason)
- {
- struct ieee80211_sub_if_data *sdata = sta->sdata;
- struct ieee80211_local *local = sdata->local;
- bool more_data = false;
- int ac;
- unsigned long driver_release_tids = 0;
- struct sk_buff_head frames;
- /* Service or PS-Poll period starts */
- set_sta_flag(sta, WLAN_STA_SP);
- __skb_queue_head_init(&frames);
- /* Get response frame(s) and more data bit for the last one. */
- for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
- unsigned long tids;
- if (ignored_acs & BIT(ac))
- continue;
- tids = ieee80211_tids_for_ac(ac);
- /* if we already have frames from software, then we can't also
- * release from hardware queues
- */
- if (skb_queue_empty(&frames)) {
- driver_release_tids |= sta->driver_buffered_tids & tids;
- driver_release_tids |= sta->txq_buffered_tids & tids;
- }
- if (driver_release_tids) {
- /* If the driver has data on more than one TID then
- * certainly there's more data if we release just a
- * single frame now (from a single TID). This will
- * only happen for PS-Poll.
- */
- if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
- hweight16(driver_release_tids) > 1) {
- more_data = true;
- driver_release_tids =
- BIT(find_highest_prio_tid(
- driver_release_tids));
- break;
- }
- } else {
- struct sk_buff *skb;
- while (n_frames > 0) {
- skb = skb_dequeue(&sta->tx_filtered[ac]);
- if (!skb) {
- skb = skb_dequeue(
- &sta->ps_tx_buf[ac]);
- if (skb)
- local->total_ps_buffered--;
- }
- if (!skb)
- break;
- n_frames--;
- __skb_queue_tail(&frames, skb);
- }
- }
- /* If we have more frames buffered on this AC, then set the
- * more-data bit and abort the loop since we can't send more
- * data from other ACs before the buffered frames from this.
- */
- if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
- !skb_queue_empty(&sta->ps_tx_buf[ac])) {
- more_data = true;
- break;
- }
- }
- if (skb_queue_empty(&frames) && !driver_release_tids) {
- int tid;
- /*
- * For PS-Poll, this can only happen due to a race condition
- * when we set the TIM bit and the station notices it, but
- * before it can poll for the frame we expire it.
- *
- * For uAPSD, this is said in the standard (11.2.1.5 h):
- * At each unscheduled SP for a non-AP STA, the AP shall
- * attempt to transmit at least one MSDU or MMPDU, but no
- * more than the value specified in the Max SP Length field
- * in the QoS Capability element from delivery-enabled ACs,
- * that are destined for the non-AP STA.
- *
- * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
- */
- /* This will evaluate to 1, 3, 5 or 7. */
- tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
- ieee80211_send_null_response(sdata, sta, tid, reason, true);
- } else if (!driver_release_tids) {
- struct sk_buff_head pending;
- struct sk_buff *skb;
- int num = 0;
- u16 tids = 0;
- bool need_null = false;
- skb_queue_head_init(&pending);
- while ((skb = __skb_dequeue(&frames))) {
- struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
- struct ieee80211_hdr *hdr = (void *) skb->data;
- u8 *qoshdr = NULL;
- num++;
- /*
- * Tell TX path to send this frame even though the
- * STA may still remain is PS mode after this frame
- * exchange.
- */
- info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
- info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
- /*
- * Use MoreData flag to indicate whether there are
- * more buffered frames for this STA
- */
- if (more_data || !skb_queue_empty(&frames))
- hdr->frame_control |=
- cpu_to_le16(IEEE80211_FCTL_MOREDATA);
- else
- hdr->frame_control &=
- cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
- if (ieee80211_is_data_qos(hdr->frame_control) ||
- ieee80211_is_qos_nullfunc(hdr->frame_control))
- qoshdr = ieee80211_get_qos_ctl(hdr);
- tids |= BIT(skb->priority);
- __skb_queue_tail(&pending, skb);
- /* end service period after last frame or add one */
- if (!skb_queue_empty(&frames))
- continue;
- if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
- /* for PS-Poll, there's only one frame */
- info->flags |= IEEE80211_TX_STATUS_EOSP |
- IEEE80211_TX_CTL_REQ_TX_STATUS;
- break;
- }
- /* For uAPSD, things are a bit more complicated. If the
- * last frame has a QoS header (i.e. is a QoS-data or
- * QoS-nulldata frame) then just set the EOSP bit there
- * and be done.
- * If the frame doesn't have a QoS header (which means
- * it should be a bufferable MMPDU) then we can't set
- * the EOSP bit in the QoS header; add a QoS-nulldata
- * frame to the list to send it after the MMPDU.
- *
- * Note that this code is only in the mac80211-release
- * code path, we assume that the driver will not buffer
- * anything but QoS-data frames, or if it does, will
- * create the QoS-nulldata frame by itself if needed.
- *
- * Cf. 802.11-2012 10.2.1.10 (c).
- */
- if (qoshdr) {
- *qoshdr |= IEEE80211_QOS_CTL_EOSP;
- info->flags |= IEEE80211_TX_STATUS_EOSP |
- IEEE80211_TX_CTL_REQ_TX_STATUS;
- } else {
- /* The standard isn't completely clear on this
- * as it says the more-data bit should be set
- * if there are more BUs. The QoS-Null frame
- * we're about to send isn't buffered yet, we
- * only create it below, but let's pretend it
- * was buffered just in case some clients only
- * expect more-data=0 when eosp=1.
- */
- hdr->frame_control |=
- cpu_to_le16(IEEE80211_FCTL_MOREDATA);
- need_null = true;
- num++;
- }
- break;
- }
- drv_allow_buffered_frames(local, sta, tids, num,
- reason, more_data);
- ieee80211_add_pending_skbs(local, &pending);
- if (need_null)
- ieee80211_send_null_response(
- sdata, sta, find_highest_prio_tid(tids),
- reason, false);
- sta_info_recalc_tim(sta);
- } else {
- unsigned long tids = sta->txq_buffered_tids & driver_release_tids;
- int tid;
- /*
- * We need to release a frame that is buffered somewhere in the
- * driver ... it'll have to handle that.
- * Note that the driver also has to check the number of frames
- * on the TIDs we're releasing from - if there are more than
- * n_frames it has to set the more-data bit (if we didn't ask
- * it to set it anyway due to other buffered frames); if there
- * are fewer than n_frames it has to make sure to adjust that
- * to allow the service period to end properly.
- */
- drv_release_buffered_frames(local, sta, driver_release_tids,
- n_frames, reason, more_data);
- /*
- * Note that we don't recalculate the TIM bit here as it would
- * most likely have no effect at all unless the driver told us
- * that the TID(s) became empty before returning here from the
- * release function.
- * Either way, however, when the driver tells us that the TID(s)
- * became empty or we find that a txq became empty, we'll do the
- * TIM recalculation.
- */
- if (!sta->sta.txq[0])
- return;
- for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
- struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
- if (!(tids & BIT(tid)) || skb_queue_len(&txqi->queue))
- continue;
- sta_info_recalc_tim(sta);
- break;
- }
- }
- }
- void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
- {
- u8 ignore_for_response = sta->sta.uapsd_queues;
- /*
- * If all ACs are delivery-enabled then we should reply
- * from any of them, if only some are enabled we reply
- * only from the non-enabled ones.
- */
- if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
- ignore_for_response = 0;
- ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
- IEEE80211_FRAME_RELEASE_PSPOLL);
- }
- void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
- {
- int n_frames = sta->sta.max_sp;
- u8 delivery_enabled = sta->sta.uapsd_queues;
- /*
- * If we ever grow support for TSPEC this might happen if
- * the TSPEC update from hostapd comes in between a trigger
- * frame setting WLAN_STA_UAPSD in the RX path and this
- * actually getting called.
- */
- if (!delivery_enabled)
- return;
- switch (sta->sta.max_sp) {
- case 1:
- n_frames = 2;
- break;
- case 2:
- n_frames = 4;
- break;
- case 3:
- n_frames = 6;
- break;
- case 0:
- /* XXX: what is a good value? */
- n_frames = 128;
- break;
- }
- ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
- IEEE80211_FRAME_RELEASE_UAPSD);
- }
- void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
- struct ieee80211_sta *pubsta, bool block)
- {
- struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
- trace_api_sta_block_awake(sta->local, pubsta, block);
- if (block) {
- set_sta_flag(sta, WLAN_STA_PS_DRIVER);
- ieee80211_clear_fast_xmit(sta);
- return;
- }
- if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
- return;
- if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
- set_sta_flag(sta, WLAN_STA_PS_DELIVER);
- clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
- ieee80211_queue_work(hw, &sta->drv_deliver_wk);
- } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
- test_sta_flag(sta, WLAN_STA_UAPSD)) {
- /* must be asleep in this case */
- clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
- ieee80211_queue_work(hw, &sta->drv_deliver_wk);
- } else {
- clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
- ieee80211_check_fast_xmit(sta);
- }
- }
- EXPORT_SYMBOL(ieee80211_sta_block_awake);
- void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
- {
- struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
- struct ieee80211_local *local = sta->local;
- trace_api_eosp(local, pubsta);
- clear_sta_flag(sta, WLAN_STA_SP);
- }
- EXPORT_SYMBOL(ieee80211_sta_eosp);
- void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
- u8 tid, bool buffered)
- {
- struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
- if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
- return;
- trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
- if (buffered)
- set_bit(tid, &sta->driver_buffered_tids);
- else
- clear_bit(tid, &sta->driver_buffered_tids);
- sta_info_recalc_tim(sta);
- }
- EXPORT_SYMBOL(ieee80211_sta_set_buffered);
- int sta_info_move_state(struct sta_info *sta,
- enum ieee80211_sta_state new_state)
- {
- might_sleep();
- if (sta->sta_state == new_state)
- return 0;
- /* check allowed transitions first */
- switch (new_state) {
- case IEEE80211_STA_NONE:
- if (sta->sta_state != IEEE80211_STA_AUTH)
- return -EINVAL;
- break;
- case IEEE80211_STA_AUTH:
- if (sta->sta_state != IEEE80211_STA_NONE &&
- sta->sta_state != IEEE80211_STA_ASSOC)
- return -EINVAL;
- break;
- case IEEE80211_STA_ASSOC:
- if (sta->sta_state != IEEE80211_STA_AUTH &&
- sta->sta_state != IEEE80211_STA_AUTHORIZED)
- return -EINVAL;
- break;
- case IEEE80211_STA_AUTHORIZED:
- if (sta->sta_state != IEEE80211_STA_ASSOC)
- return -EINVAL;
- break;
- default:
- WARN(1, "invalid state %d", new_state);
- return -EINVAL;
- }
- sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
- sta->sta.addr, new_state);
- /*
- * notify the driver before the actual changes so it can
- * fail the transition
- */
- if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
- int err = drv_sta_state(sta->local, sta->sdata, sta,
- sta->sta_state, new_state);
- if (err)
- return err;
- }
- /* reflect the change in all state variables */
- switch (new_state) {
- case IEEE80211_STA_NONE:
- if (sta->sta_state == IEEE80211_STA_AUTH)
- clear_bit(WLAN_STA_AUTH, &sta->_flags);
- break;
- case IEEE80211_STA_AUTH:
- if (sta->sta_state == IEEE80211_STA_NONE)
- set_bit(WLAN_STA_AUTH, &sta->_flags);
- else if (sta->sta_state == IEEE80211_STA_ASSOC)
- clear_bit(WLAN_STA_ASSOC, &sta->_flags);
- break;
- case IEEE80211_STA_ASSOC:
- if (sta->sta_state == IEEE80211_STA_AUTH) {
- set_bit(WLAN_STA_ASSOC, &sta->_flags);
- } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
- if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
- (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
- !sta->sdata->u.vlan.sta))
- atomic_dec(&sta->sdata->bss->num_mcast_sta);
- clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
- ieee80211_clear_fast_xmit(sta);
- }
- break;
- case IEEE80211_STA_AUTHORIZED:
- if (sta->sta_state == IEEE80211_STA_ASSOC) {
- if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
- (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
- !sta->sdata->u.vlan.sta))
- atomic_inc(&sta->sdata->bss->num_mcast_sta);
- set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
- ieee80211_check_fast_xmit(sta);
- }
- break;
- default:
- break;
- }
- sta->sta_state = new_state;
- return 0;
- }
- u8 sta_info_tx_streams(struct sta_info *sta)
- {
- struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
- u8 rx_streams;
- if (!sta->sta.ht_cap.ht_supported)
- return 1;
- if (sta->sta.vht_cap.vht_supported) {
- int i;
- u16 tx_mcs_map =
- le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
- for (i = 7; i >= 0; i--)
- if ((tx_mcs_map & (0x3 << (i * 2))) !=
- IEEE80211_VHT_MCS_NOT_SUPPORTED)
- return i + 1;
- }
- if (ht_cap->mcs.rx_mask[3])
- rx_streams = 4;
- else if (ht_cap->mcs.rx_mask[2])
- rx_streams = 3;
- else if (ht_cap->mcs.rx_mask[1])
- rx_streams = 2;
- else
- rx_streams = 1;
- if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
- return rx_streams;
- return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
- >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
- }
- static void sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
- {
- rinfo->flags = 0;
- if (sta->rx_stats.last_rate_flag & RX_FLAG_HT) {
- rinfo->flags |= RATE_INFO_FLAGS_MCS;
- rinfo->mcs = sta->rx_stats.last_rate_idx;
- } else if (sta->rx_stats.last_rate_flag & RX_FLAG_VHT) {
- rinfo->flags |= RATE_INFO_FLAGS_VHT_MCS;
- rinfo->nss = sta->rx_stats.last_rate_vht_nss;
- rinfo->mcs = sta->rx_stats.last_rate_idx;
- } else {
- struct ieee80211_supported_band *sband;
- int shift = ieee80211_vif_get_shift(&sta->sdata->vif);
- u16 brate;
- sband = sta->local->hw.wiphy->bands[
- ieee80211_get_sdata_band(sta->sdata)];
- brate = sband->bitrates[sta->rx_stats.last_rate_idx].bitrate;
- rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
- }
- if (sta->rx_stats.last_rate_flag & RX_FLAG_SHORT_GI)
- rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
- if (sta->rx_stats.last_rate_flag & RX_FLAG_5MHZ)
- rinfo->bw = RATE_INFO_BW_5;
- else if (sta->rx_stats.last_rate_flag & RX_FLAG_10MHZ)
- rinfo->bw = RATE_INFO_BW_10;
- else if (sta->rx_stats.last_rate_flag & RX_FLAG_40MHZ)
- rinfo->bw = RATE_INFO_BW_40;
- else if (sta->rx_stats.last_rate_vht_flag & RX_VHT_FLAG_80MHZ)
- rinfo->bw = RATE_INFO_BW_80;
- else if (sta->rx_stats.last_rate_vht_flag & RX_VHT_FLAG_160MHZ)
- rinfo->bw = RATE_INFO_BW_160;
- else
- rinfo->bw = RATE_INFO_BW_20;
- }
- void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
- {
- struct ieee80211_sub_if_data *sdata = sta->sdata;
- struct ieee80211_local *local = sdata->local;
- struct rate_control_ref *ref = NULL;
- u32 thr = 0;
- int i, ac;
- if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
- ref = local->rate_ctrl;
- sinfo->generation = sdata->local->sta_generation;
- /* do before driver, so beacon filtering drivers have a
- * chance to e.g. just add the number of filtered beacons
- * (or just modify the value entirely, of course)
- */
- if (sdata->vif.type == NL80211_IFTYPE_STATION)
- sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
- drv_sta_statistics(local, sdata, &sta->sta, sinfo);
- sinfo->filled |= BIT(NL80211_STA_INFO_INACTIVE_TIME) |
- BIT(NL80211_STA_INFO_STA_FLAGS) |
- BIT(NL80211_STA_INFO_BSS_PARAM) |
- BIT(NL80211_STA_INFO_CONNECTED_TIME) |
- BIT(NL80211_STA_INFO_RX_DROP_MISC);
- if (sdata->vif.type == NL80211_IFTYPE_STATION) {
- sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
- sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_LOSS);
- }
- sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
- sinfo->inactive_time =
- jiffies_to_msecs(jiffies - sta->rx_stats.last_rx);
- if (!(sinfo->filled & (BIT(NL80211_STA_INFO_TX_BYTES64) |
- BIT(NL80211_STA_INFO_TX_BYTES)))) {
- sinfo->tx_bytes = 0;
- for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
- sinfo->tx_bytes += sta->tx_stats.bytes[ac];
- sinfo->filled |= BIT(NL80211_STA_INFO_TX_BYTES64);
- }
- if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_PACKETS))) {
- sinfo->tx_packets = 0;
- for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
- sinfo->tx_packets += sta->tx_stats.packets[ac];
- sinfo->filled |= BIT(NL80211_STA_INFO_TX_PACKETS);
- }
- if (!(sinfo->filled & (BIT(NL80211_STA_INFO_RX_BYTES64) |
- BIT(NL80211_STA_INFO_RX_BYTES)))) {
- sinfo->rx_bytes = sta->rx_stats.bytes;
- sinfo->filled |= BIT(NL80211_STA_INFO_RX_BYTES64);
- }
- if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_PACKETS))) {
- sinfo->rx_packets = sta->rx_stats.packets;
- sinfo->filled |= BIT(NL80211_STA_INFO_RX_PACKETS);
- }
- if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_RETRIES))) {
- sinfo->tx_retries = sta->status_stats.retry_count;
- sinfo->filled |= BIT(NL80211_STA_INFO_TX_RETRIES);
- }
- if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_FAILED))) {
- sinfo->tx_failed = sta->status_stats.retry_failed;
- sinfo->filled |= BIT(NL80211_STA_INFO_TX_FAILED);
- }
- sinfo->rx_dropped_misc = sta->rx_stats.dropped;
- if (sdata->vif.type == NL80211_IFTYPE_STATION &&
- !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
- sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_RX) |
- BIT(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
- sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
- }
- if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
- ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
- if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL))) {
- sinfo->signal = (s8)sta->rx_stats.last_signal;
- sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL);
- }
- if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL_AVG))) {
- sinfo->signal_avg =
- -ewma_signal_read(&sta->rx_stats.avg_signal);
- sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL_AVG);
- }
- }
- if (sta->rx_stats.chains &&
- !(sinfo->filled & (BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
- BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
- sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
- BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
- sinfo->chains = sta->rx_stats.chains;
- for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
- sinfo->chain_signal[i] =
- sta->rx_stats.chain_signal_last[i];
- sinfo->chain_signal_avg[i] =
- -ewma_signal_read(&sta->rx_stats.chain_signal_avg[i]);
- }
- }
- if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_BITRATE))) {
- sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate,
- &sinfo->txrate);
- sinfo->filled |= BIT(NL80211_STA_INFO_TX_BITRATE);
- }
- if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_BITRATE))) {
- sta_set_rate_info_rx(sta, &sinfo->rxrate);
- sinfo->filled |= BIT(NL80211_STA_INFO_RX_BITRATE);
- }
- sinfo->filled |= BIT(NL80211_STA_INFO_TID_STATS);
- for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
- struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i];
- if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
- tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
- tidstats->rx_msdu = sta->rx_stats.msdu[i];
- }
- if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
- tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
- tidstats->tx_msdu = sta->tx_stats.msdu[i];
- }
- if (!(tidstats->filled &
- BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
- ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
- tidstats->filled |=
- BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
- tidstats->tx_msdu_retries =
- sta->status_stats.msdu_retries[i];
- }
- if (!(tidstats->filled &
- BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
- ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
- tidstats->filled |=
- BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
- tidstats->tx_msdu_failed =
- sta->status_stats.msdu_failed[i];
- }
- }
- if (ieee80211_vif_is_mesh(&sdata->vif)) {
- #ifdef CONFIG_MAC80211_MESH
- sinfo->filled |= BIT(NL80211_STA_INFO_LLID) |
- BIT(NL80211_STA_INFO_PLID) |
- BIT(NL80211_STA_INFO_PLINK_STATE) |
- BIT(NL80211_STA_INFO_LOCAL_PM) |
- BIT(NL80211_STA_INFO_PEER_PM) |
- BIT(NL80211_STA_INFO_NONPEER_PM);
- sinfo->llid = sta->mesh->llid;
- sinfo->plid = sta->mesh->plid;
- sinfo->plink_state = sta->mesh->plink_state;
- if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
- sinfo->filled |= BIT(NL80211_STA_INFO_T_OFFSET);
- sinfo->t_offset = sta->mesh->t_offset;
- }
- sinfo->local_pm = sta->mesh->local_pm;
- sinfo->peer_pm = sta->mesh->peer_pm;
- sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
- #endif
- }
- sinfo->bss_param.flags = 0;
- if (sdata->vif.bss_conf.use_cts_prot)
- sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
- if (sdata->vif.bss_conf.use_short_preamble)
- sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
- if (sdata->vif.bss_conf.use_short_slot)
- sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
- sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
- sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
- sinfo->sta_flags.set = 0;
- sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
- BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
- BIT(NL80211_STA_FLAG_WME) |
- BIT(NL80211_STA_FLAG_MFP) |
- BIT(NL80211_STA_FLAG_AUTHENTICATED) |
- BIT(NL80211_STA_FLAG_ASSOCIATED) |
- BIT(NL80211_STA_FLAG_TDLS_PEER);
- if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
- sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
- if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
- sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
- if (sta->sta.wme)
- sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
- if (test_sta_flag(sta, WLAN_STA_MFP))
- sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
- if (test_sta_flag(sta, WLAN_STA_AUTH))
- sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
- if (test_sta_flag(sta, WLAN_STA_ASSOC))
- sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
- if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
- sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
- /* check if the driver has a SW RC implementation */
- if (ref && ref->ops->get_expected_throughput)
- thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
- else
- thr = drv_get_expected_throughput(local, &sta->sta);
- if (thr != 0) {
- sinfo->filled |= BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
- sinfo->expected_throughput = thr;
- }
- }
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