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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/etherdevice.h>
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/timer.h>
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#include <linux/rtnetlink.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "debugfs_sta.h"
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* DOC: STA information lifetime rules
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* STA info structures (&struct sta_info) are managed in a hash table
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* for faster lookup and a list for iteration. They are managed using
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* RCU, i.e. access to the list and hash table is protected by RCU.
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* Upon allocating a STA info structure with sta_info_alloc(), the caller
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* owns that structure. It must then insert it into the hash table using
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* either sta_info_insert() or sta_info_insert_rcu(); only in the latter
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* case (which acquires an rcu read section but must not be called from
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* within one) will the pointer still be valid after the call. Note that
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* the caller may not do much with the STA info before inserting it, in
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* particular, it may not start any mesh peer link management or add
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* When the insertion fails (sta_info_insert()) returns non-zero), the
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* structure will have been freed by sta_info_insert()!
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* Station entries are added by mac80211 when you establish a link with a
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* peer. This means different things for the different type of interfaces
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* we support. For a regular station this mean we add the AP sta when we
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* receive an association response from the AP. For IBSS this occurs when
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* get to know about a peer on the same IBSS. For WDS we add the sta for
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* the peer immediately upon device open. When using AP mode we add stations
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* for each respective station upon request from userspace through nl80211.
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* In order to remove a STA info structure, various sta_info_destroy_*()
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* calls are available.
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* There is no concept of ownership on a STA entry, each structure is
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* owned by the global hash table/list until it is removed. All users of
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* the structure need to be RCU protected so that the structure won't be
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* freed before they are done using it.
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/* Caller must hold local->sta_mtx */
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static int sta_info_hash_del(struct ieee80211_local *local,
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s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
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lockdep_is_held(&local->sta_mtx));
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rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
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while (rcu_access_pointer(s->hnext) &&
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rcu_access_pointer(s->hnext) != sta)
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s = rcu_dereference_protected(s->hnext,
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lockdep_is_held(&local->sta_mtx));
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if (rcu_access_pointer(s->hnext)) {
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rcu_assign_pointer(s->hnext, sta->hnext);
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/* protected by RCU */
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struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_local *local = sdata->local;
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sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
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lockdep_is_held(&local->sta_mtx));
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if (sta->sdata == sdata &&
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ether_addr_equal(sta->sta.addr, addr))
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sta = rcu_dereference_check(sta->hnext,
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lockdep_is_held(&local->sta_mtx));
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* Get sta info either from the specified interface
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* or from one of its vlans
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struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
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lockdep_is_held(&local->sta_mtx));
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if ((sta->sdata == sdata ||
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(sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
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ether_addr_equal(sta->sta.addr, addr))
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sta = rcu_dereference_check(sta->hnext,
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lockdep_is_held(&local->sta_mtx));
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struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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list_for_each_entry_rcu(sta, &local->sta_list, list) {
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if (sdata != sta->sdata)
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* sta_info_free - free STA
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* @local: pointer to the global information
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* @sta: STA info to free
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* This function must undo everything done by sta_info_alloc()
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* that may happen before sta_info_insert(). It may only be
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* called when sta_info_insert() has not been attempted (and
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* if that fails, the station is freed anyway.)
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void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
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rate_control_free_sta(sta);
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sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
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/* Caller must hold local->sta_mtx */
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static void sta_info_hash_add(struct ieee80211_local *local,
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struct sta_info *sta)
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lockdep_assert_held(&local->sta_mtx);
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sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
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rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
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static void sta_unblock(struct work_struct *wk)
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struct sta_info *sta;
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sta = container_of(wk, struct sta_info, drv_unblock_wk);
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if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
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ieee80211_sta_ps_deliver_wakeup(sta);
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} else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
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clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
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ieee80211_sta_ps_deliver_poll_response(sta);
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} else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
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clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
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ieee80211_sta_ps_deliver_uapsd(sta);
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clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
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static int sta_prepare_rate_control(struct ieee80211_local *local,
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struct sta_info *sta, gfp_t gfp)
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if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
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sta->rate_ctrl = local->rate_ctrl;
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sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
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if (!sta->rate_ctrl_priv)
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struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
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const u8 *addr, gfp_t gfp)
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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struct timespec uptime;
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sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
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spin_lock_init(&sta->lock);
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INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
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INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
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mutex_init(&sta->ampdu_mlme.mtx);
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memcpy(sta->sta.addr, addr, ETH_ALEN);
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sta->last_rx = jiffies;
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sta->sta_state = IEEE80211_STA_NONE;
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do_posix_clock_monotonic_gettime(&uptime);
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sta->last_connected = uptime.tv_sec;
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ewma_init(&sta->avg_signal, 1024, 8);
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if (sta_prepare_rate_control(local, sta, gfp)) {
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for (i = 0; i < STA_TID_NUM; i++) {
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* timer_to_tid must be initialized with identity mapping
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* to enable session_timer's data differentiation. See
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* sta_rx_agg_session_timer_expired for usage.
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sta->timer_to_tid[i] = i;
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for (i = 0; i < IEEE80211_NUM_ACS; i++) {
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skb_queue_head_init(&sta->ps_tx_buf[i]);
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skb_queue_head_init(&sta->tx_filtered[i]);
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for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
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sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
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sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
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#ifdef CONFIG_MAC80211_MESH
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sta->plink_state = NL80211_PLINK_LISTEN;
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init_timer(&sta->plink_timer);
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static int sta_info_insert_check(struct sta_info *sta)
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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* Can't be a WARN_ON because it can be triggered through a race:
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* something inserts a STA (on one CPU) without holding the RTNL
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* and another CPU turns off the net device.
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if (unlikely(!ieee80211_sdata_running(sdata)))
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if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
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is_multicast_ether_addr(sta->sta.addr)))
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static int sta_info_insert_drv_state(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta)
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enum ieee80211_sta_state state;
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for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
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err = drv_sta_state(local, sdata, sta, state, state + 1);
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* Drivers using legacy sta_add/sta_remove callbacks only
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* get uploaded set to true after sta_add is called.
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if (!local->ops->sta_add)
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sta->uploaded = true;
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if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
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"failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
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sta->sta.addr, state + 1, err);
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/* unwind on error */
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for (; state > IEEE80211_STA_NOTEXIST; state--)
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WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
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* should be called with sta_mtx locked
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* this function replaces the mutex lock
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static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
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struct ieee80211_local *local = sta->local;
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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struct station_info sinfo;
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lockdep_assert_held(&local->sta_mtx);
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/* check if STA exists already */
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if (sta_info_get_bss(sdata, sta->sta.addr)) {
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err = sta_info_insert_drv_state(local, sdata, sta);
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local->sta_generation++;
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/* make the station visible */
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sta_info_hash_add(local, sta);
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list_add_rcu(&sta->list, &local->sta_list);
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set_sta_flag(sta, WLAN_STA_INSERTED);
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ieee80211_sta_debugfs_add(sta);
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rate_control_add_sta_debugfs(sta);
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memset(&sinfo, 0, sizeof(sinfo));
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sinfo.generation = local->sta_generation;
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cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
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sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
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/* move reference to rcu-protected */
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mutex_unlock(&local->sta_mtx);
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if (ieee80211_vif_is_mesh(&sdata->vif))
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mesh_accept_plinks_update(sdata);
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mutex_unlock(&local->sta_mtx);
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int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
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struct ieee80211_local *local = sta->local;
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err = sta_info_insert_check(sta);
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mutex_lock(&local->sta_mtx);
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err = sta_info_insert_finish(sta);
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sta_info_free(local, sta);
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int sta_info_insert(struct sta_info *sta)
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int err = sta_info_insert_rcu(sta);
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static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
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* This format has been mandated by the IEEE specifications,
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* so this line may not be changed to use the __set_bit() format.
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bss->tim[aid / 8] |= (1 << (aid % 8));
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static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
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* This format has been mandated by the IEEE specifications,
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* so this line may not be changed to use the __clear_bit() format.
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bss->tim[aid / 8] &= ~(1 << (aid % 8));
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static unsigned long ieee80211_tids_for_ac(int ac)
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/* If we ever support TIDs > 7, this obviously needs to be adjusted */
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case IEEE80211_AC_VO:
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return BIT(6) | BIT(7);
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case IEEE80211_AC_VI:
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return BIT(4) | BIT(5);
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case IEEE80211_AC_BE:
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return BIT(0) | BIT(3);
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case IEEE80211_AC_BK:
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return BIT(1) | BIT(2);
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void sta_info_recalc_tim(struct sta_info *sta)
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struct ieee80211_local *local = sta->local;
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struct ieee80211_if_ap *bss = sta->sdata->bss;
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bool indicate_tim = false;
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u8 ignore_for_tim = sta->sta.uapsd_queues;
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if (WARN_ON_ONCE(!sta->sdata->bss))
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/* No need to do anything if the driver does all */
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if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
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* If all ACs are delivery-enabled then we should build
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* the TIM bit for all ACs anyway; if only some are then
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* we ignore those and build the TIM bit using only the
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if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
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for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
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if (ignore_for_tim & BIT(ac))
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indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
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!skb_queue_empty(&sta->ps_tx_buf[ac]);
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tids = ieee80211_tids_for_ac(ac);
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sta->driver_buffered_tids & tids;
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spin_lock_irqsave(&local->tim_lock, flags);
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__bss_tim_set(bss, sta->sta.aid);
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__bss_tim_clear(bss, sta->sta.aid);
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if (local->ops->set_tim) {
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local->tim_in_locked_section = true;
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drv_set_tim(local, &sta->sta, indicate_tim);
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local->tim_in_locked_section = false;
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spin_unlock_irqrestore(&local->tim_lock, flags);
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static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
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struct ieee80211_tx_info *info;
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info = IEEE80211_SKB_CB(skb);
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/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
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timeout = (sta->listen_interval *
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sta->sdata->vif.bss_conf.beacon_int *
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if (timeout < STA_TX_BUFFER_EXPIRE)
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timeout = STA_TX_BUFFER_EXPIRE;
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return time_after(jiffies, info->control.jiffies + timeout);
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static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
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struct sta_info *sta, int ac)
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* First check for frames that should expire on the filtered
566
* queue. Frames here were rejected by the driver and are on
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* a separate queue to avoid reordering with normal PS-buffered
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* frames. They also aren't accounted for right now in the
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* total_ps_buffered counter.
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spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
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skb = skb_peek(&sta->tx_filtered[ac]);
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if (sta_info_buffer_expired(sta, skb))
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skb = __skb_dequeue(&sta->tx_filtered[ac]);
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spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
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* Frames are queued in order, so if this one
582
* hasn't expired yet we can stop testing. If
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* we actually reached the end of the queue we
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* also need to stop, of course.
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* Now also check the normal PS-buffered queue, this will
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* only find something if the filtered queue was emptied
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* since the filtered frames are all before the normal PS
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spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
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skb = skb_peek(&sta->ps_tx_buf[ac]);
600
if (sta_info_buffer_expired(sta, skb))
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skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
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spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
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* frames are queued in order, so if this one
608
* hasn't expired yet (or we reached the end of
609
* the queue) we can stop testing
614
local->total_ps_buffered--;
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ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
621
* Finally, recalculate the TIM bit for this station -- it might
622
* now be clear because the station was too slow to retrieve its
625
sta_info_recalc_tim(sta);
628
* Return whether there are any frames still buffered, this is
629
* used to check whether the cleanup timer still needs to run,
630
* if there are no frames we don't need to rearm the timer.
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return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
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skb_queue_empty(&sta->tx_filtered[ac]));
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static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
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struct sta_info *sta)
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bool have_buffered = false;
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/* This is only necessary for stations on BSS interfaces */
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if (!sta->sdata->bss)
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for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
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sta_info_cleanup_expire_buffered_ac(local, sta, ac);
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return have_buffered;
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int __must_check __sta_info_destroy(struct sta_info *sta)
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struct ieee80211_local *local;
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struct ieee80211_sub_if_data *sdata;
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struct tid_ampdu_tx *tid_tx;
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lockdep_assert_held(&local->sta_mtx);
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* Before removing the station from the driver and
672
* rate control, it might still start new aggregation
673
* sessions -- block that to make sure the tear-down
674
* will be sufficient.
676
set_sta_flag(sta, WLAN_STA_BLOCK_BA);
677
ieee80211_sta_tear_down_BA_sessions(sta, true);
679
ret = sta_info_hash_del(local, sta);
683
list_del_rcu(&sta->list);
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mutex_lock(&local->key_mtx);
686
for (i = 0; i < NUM_DEFAULT_KEYS; i++)
687
__ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
689
__ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
690
mutex_unlock(&local->key_mtx);
695
local->sta_generation++;
697
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
698
RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
700
while (sta->sta_state > IEEE80211_STA_NONE) {
701
ret = sta_info_move_state(sta, sta->sta_state - 1);
709
ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
710
IEEE80211_STA_NOTEXIST);
711
WARN_ON_ONCE(ret != 0);
715
* At this point, after we wait for an RCU grace period,
716
* neither mac80211 nor the driver can reference this
717
* sta struct any more except by still existing timers
718
* associated with this station that we clean up below.
722
if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
725
clear_sta_flag(sta, WLAN_STA_PS_STA);
727
atomic_dec(&sdata->bss->num_sta_ps);
728
sta_info_recalc_tim(sta);
731
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
732
local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
733
__skb_queue_purge(&sta->ps_tx_buf[ac]);
734
__skb_queue_purge(&sta->tx_filtered[ac]);
737
#ifdef CONFIG_MAC80211_MESH
738
if (ieee80211_vif_is_mesh(&sdata->vif))
739
mesh_accept_plinks_update(sdata);
742
sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
744
cancel_work_sync(&sta->drv_unblock_wk);
746
cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
748
rate_control_remove_sta_debugfs(sta);
749
ieee80211_sta_debugfs_remove(sta);
751
#ifdef CONFIG_MAC80211_MESH
752
if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
753
mesh_plink_deactivate(sta);
754
del_timer_sync(&sta->plink_timer);
759
* Destroy aggregation state here. It would be nice to wait for the
760
* driver to finish aggregation stop and then clean up, but for now
761
* drivers have to handle aggregation stop being requested, followed
762
* directly by station destruction.
764
for (i = 0; i < STA_TID_NUM; i++) {
765
tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
768
__skb_queue_purge(&tid_tx->pending);
772
sta_info_free(local, sta);
777
int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
779
struct sta_info *sta;
782
mutex_lock(&sdata->local->sta_mtx);
783
sta = sta_info_get(sdata, addr);
784
ret = __sta_info_destroy(sta);
785
mutex_unlock(&sdata->local->sta_mtx);
790
int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
793
struct sta_info *sta;
796
mutex_lock(&sdata->local->sta_mtx);
797
sta = sta_info_get_bss(sdata, addr);
798
ret = __sta_info_destroy(sta);
799
mutex_unlock(&sdata->local->sta_mtx);
804
static void sta_info_cleanup(unsigned long data)
806
struct ieee80211_local *local = (struct ieee80211_local *) data;
807
struct sta_info *sta;
808
bool timer_needed = false;
811
list_for_each_entry_rcu(sta, &local->sta_list, list)
812
if (sta_info_cleanup_expire_buffered(local, sta))
816
if (local->quiescing)
822
mod_timer(&local->sta_cleanup,
823
round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
826
void sta_info_init(struct ieee80211_local *local)
828
spin_lock_init(&local->tim_lock);
829
mutex_init(&local->sta_mtx);
830
INIT_LIST_HEAD(&local->sta_list);
832
setup_timer(&local->sta_cleanup, sta_info_cleanup,
833
(unsigned long)local);
836
void sta_info_stop(struct ieee80211_local *local)
838
del_timer(&local->sta_cleanup);
839
sta_info_flush(local, NULL);
843
* sta_info_flush - flush matching STA entries from the STA table
845
* Returns the number of removed STA entries.
847
* @local: local interface data
848
* @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
850
int sta_info_flush(struct ieee80211_local *local,
851
struct ieee80211_sub_if_data *sdata)
853
struct sta_info *sta, *tmp;
858
mutex_lock(&local->sta_mtx);
859
list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
860
if (!sdata || sdata == sta->sdata) {
861
WARN_ON(__sta_info_destroy(sta));
865
mutex_unlock(&local->sta_mtx);
870
void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
871
unsigned long exp_time)
873
struct ieee80211_local *local = sdata->local;
874
struct sta_info *sta, *tmp;
876
mutex_lock(&local->sta_mtx);
878
list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
879
if (sdata != sta->sdata)
882
if (time_after(jiffies, sta->last_rx + exp_time)) {
883
ibss_dbg(sdata, "expiring inactive STA %pM\n",
885
WARN_ON(__sta_info_destroy(sta));
889
mutex_unlock(&local->sta_mtx);
892
struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
896
struct sta_info *sta, *nxt;
899
* Just return a random station if localaddr is NULL
902
for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
904
!ether_addr_equal(sta->sdata->vif.addr, localaddr))
913
EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
915
struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
918
struct sta_info *sta;
923
sta = sta_info_get_bss(vif_to_sdata(vif), addr);
932
EXPORT_SYMBOL(ieee80211_find_sta);
934
static void clear_sta_ps_flags(void *_sta)
936
struct sta_info *sta = _sta;
937
struct ieee80211_sub_if_data *sdata = sta->sdata;
939
clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
940
if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
941
atomic_dec(&sdata->bss->num_sta_ps);
944
/* powersave support code */
945
void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
947
struct ieee80211_sub_if_data *sdata = sta->sdata;
948
struct ieee80211_local *local = sdata->local;
949
struct sk_buff_head pending;
950
int filtered = 0, buffered = 0, ac;
952
clear_sta_flag(sta, WLAN_STA_SP);
954
BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1);
955
sta->driver_buffered_tids = 0;
957
if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
958
drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
960
skb_queue_head_init(&pending);
962
/* Send all buffered frames to the station */
963
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
964
int count = skb_queue_len(&pending), tmp;
966
skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
967
tmp = skb_queue_len(&pending);
968
filtered += tmp - count;
971
skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
972
tmp = skb_queue_len(&pending);
973
buffered += tmp - count;
976
ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
978
local->total_ps_buffered -= buffered;
980
sta_info_recalc_tim(sta);
983
"STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
984
sta->sta.addr, sta->sta.aid, filtered, buffered);
987
static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
988
struct sta_info *sta, int tid,
989
enum ieee80211_frame_release_type reason)
991
struct ieee80211_local *local = sdata->local;
992
struct ieee80211_qos_hdr *nullfunc;
994
int size = sizeof(*nullfunc);
996
bool qos = test_sta_flag(sta, WLAN_STA_WME);
997
struct ieee80211_tx_info *info;
1000
fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1001
IEEE80211_STYPE_QOS_NULLFUNC |
1002
IEEE80211_FCTL_FROMDS);
1005
fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1006
IEEE80211_STYPE_NULLFUNC |
1007
IEEE80211_FCTL_FROMDS);
1010
skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1014
skb_reserve(skb, local->hw.extra_tx_headroom);
1016
nullfunc = (void *) skb_put(skb, size);
1017
nullfunc->frame_control = fc;
1018
nullfunc->duration_id = 0;
1019
memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1020
memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1021
memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1023
skb->priority = tid;
1024
skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1026
nullfunc->qos_ctrl = cpu_to_le16(tid);
1028
if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1029
nullfunc->qos_ctrl |=
1030
cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1033
info = IEEE80211_SKB_CB(skb);
1036
* Tell TX path to send this frame even though the
1037
* STA may still remain is PS mode after this frame
1038
* exchange. Also set EOSP to indicate this packet
1039
* ends the poll/service period.
1041
info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1042
IEEE80211_TX_STATUS_EOSP |
1043
IEEE80211_TX_CTL_REQ_TX_STATUS;
1045
drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1047
ieee80211_xmit(sdata, skb);
1051
ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1052
int n_frames, u8 ignored_acs,
1053
enum ieee80211_frame_release_type reason)
1055
struct ieee80211_sub_if_data *sdata = sta->sdata;
1056
struct ieee80211_local *local = sdata->local;
1058
bool more_data = false;
1060
unsigned long driver_release_tids = 0;
1061
struct sk_buff_head frames;
1063
/* Service or PS-Poll period starts */
1064
set_sta_flag(sta, WLAN_STA_SP);
1066
__skb_queue_head_init(&frames);
1069
* Get response frame(s) and more data bit for it.
1071
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1074
if (ignored_acs & BIT(ac))
1077
tids = ieee80211_tids_for_ac(ac);
1080
driver_release_tids = sta->driver_buffered_tids & tids;
1081
if (driver_release_tids) {
1084
struct sk_buff *skb;
1086
while (n_frames > 0) {
1087
skb = skb_dequeue(&sta->tx_filtered[ac]);
1090
&sta->ps_tx_buf[ac]);
1092
local->total_ps_buffered--;
1098
__skb_queue_tail(&frames, skb);
1103
* If the driver has data on more than one TID then
1104
* certainly there's more data if we release just a
1105
* single frame now (from a single TID).
1107
if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1108
hweight16(driver_release_tids) > 1) {
1110
driver_release_tids =
1111
BIT(ffs(driver_release_tids) - 1);
1116
if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1117
!skb_queue_empty(&sta->ps_tx_buf[ac])) {
1127
* For PS-Poll, this can only happen due to a race condition
1128
* when we set the TIM bit and the station notices it, but
1129
* before it can poll for the frame we expire it.
1131
* For uAPSD, this is said in the standard (11.2.1.5 h):
1132
* At each unscheduled SP for a non-AP STA, the AP shall
1133
* attempt to transmit at least one MSDU or MMPDU, but no
1134
* more than the value specified in the Max SP Length field
1135
* in the QoS Capability element from delivery-enabled ACs,
1136
* that are destined for the non-AP STA.
1138
* Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1141
/* This will evaluate to 1, 3, 5 or 7. */
1142
tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1144
ieee80211_send_null_response(sdata, sta, tid, reason);
1148
if (!driver_release_tids) {
1149
struct sk_buff_head pending;
1150
struct sk_buff *skb;
1154
skb_queue_head_init(&pending);
1156
while ((skb = __skb_dequeue(&frames))) {
1157
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1158
struct ieee80211_hdr *hdr = (void *) skb->data;
1164
* Tell TX path to send this frame even though the
1165
* STA may still remain is PS mode after this frame
1168
info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1171
* Use MoreData flag to indicate whether there are
1172
* more buffered frames for this STA
1174
if (more_data || !skb_queue_empty(&frames))
1175
hdr->frame_control |=
1176
cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1178
hdr->frame_control &=
1179
cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1181
if (ieee80211_is_data_qos(hdr->frame_control) ||
1182
ieee80211_is_qos_nullfunc(hdr->frame_control))
1183
qoshdr = ieee80211_get_qos_ctl(hdr);
1185
/* end service period after last frame */
1186
if (skb_queue_empty(&frames)) {
1187
if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1189
*qoshdr |= IEEE80211_QOS_CTL_EOSP;
1191
info->flags |= IEEE80211_TX_STATUS_EOSP |
1192
IEEE80211_TX_CTL_REQ_TX_STATUS;
1196
tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1200
__skb_queue_tail(&pending, skb);
1203
drv_allow_buffered_frames(local, sta, tids, num,
1206
ieee80211_add_pending_skbs(local, &pending);
1208
sta_info_recalc_tim(sta);
1211
* We need to release a frame that is buffered somewhere in the
1212
* driver ... it'll have to handle that.
1213
* Note that, as per the comment above, it'll also have to see
1214
* if there is more than just one frame on the specific TID that
1215
* we're releasing from, and it needs to set the more-data bit
1216
* accordingly if we tell it that there's no more data. If we do
1217
* tell it there's more data, then of course the more-data bit
1218
* needs to be set anyway.
1220
drv_release_buffered_frames(local, sta, driver_release_tids,
1221
n_frames, reason, more_data);
1224
* Note that we don't recalculate the TIM bit here as it would
1225
* most likely have no effect at all unless the driver told us
1226
* that the TID became empty before returning here from the
1228
* Either way, however, when the driver tells us that the TID
1229
* became empty we'll do the TIM recalculation.
1234
void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1236
u8 ignore_for_response = sta->sta.uapsd_queues;
1239
* If all ACs are delivery-enabled then we should reply
1240
* from any of them, if only some are enabled we reply
1241
* only from the non-enabled ones.
1243
if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1244
ignore_for_response = 0;
1246
ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1247
IEEE80211_FRAME_RELEASE_PSPOLL);
1250
void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1252
int n_frames = sta->sta.max_sp;
1253
u8 delivery_enabled = sta->sta.uapsd_queues;
1256
* If we ever grow support for TSPEC this might happen if
1257
* the TSPEC update from hostapd comes in between a trigger
1258
* frame setting WLAN_STA_UAPSD in the RX path and this
1259
* actually getting called.
1261
if (!delivery_enabled)
1264
switch (sta->sta.max_sp) {
1275
/* XXX: what is a good value? */
1280
ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1281
IEEE80211_FRAME_RELEASE_UAPSD);
1284
void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1285
struct ieee80211_sta *pubsta, bool block)
1287
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1289
trace_api_sta_block_awake(sta->local, pubsta, block);
1292
set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1293
else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1294
ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1296
EXPORT_SYMBOL(ieee80211_sta_block_awake);
1298
void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
1300
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1301
struct ieee80211_local *local = sta->local;
1302
struct sk_buff *skb;
1303
struct skb_eosp_msg_data *data;
1305
trace_api_eosp(local, pubsta);
1307
skb = alloc_skb(0, GFP_ATOMIC);
1309
/* too bad ... but race is better than loss */
1310
clear_sta_flag(sta, WLAN_STA_SP);
1314
data = (void *)skb->cb;
1315
memcpy(data->sta, pubsta->addr, ETH_ALEN);
1316
memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
1317
skb->pkt_type = IEEE80211_EOSP_MSG;
1318
skb_queue_tail(&local->skb_queue, skb);
1319
tasklet_schedule(&local->tasklet);
1321
EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
1323
void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1324
u8 tid, bool buffered)
1326
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1328
if (WARN_ON(tid >= STA_TID_NUM))
1332
set_bit(tid, &sta->driver_buffered_tids);
1334
clear_bit(tid, &sta->driver_buffered_tids);
1336
sta_info_recalc_tim(sta);
1338
EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1340
int sta_info_move_state(struct sta_info *sta,
1341
enum ieee80211_sta_state new_state)
1345
if (sta->sta_state == new_state)
1348
/* check allowed transitions first */
1350
switch (new_state) {
1351
case IEEE80211_STA_NONE:
1352
if (sta->sta_state != IEEE80211_STA_AUTH)
1355
case IEEE80211_STA_AUTH:
1356
if (sta->sta_state != IEEE80211_STA_NONE &&
1357
sta->sta_state != IEEE80211_STA_ASSOC)
1360
case IEEE80211_STA_ASSOC:
1361
if (sta->sta_state != IEEE80211_STA_AUTH &&
1362
sta->sta_state != IEEE80211_STA_AUTHORIZED)
1365
case IEEE80211_STA_AUTHORIZED:
1366
if (sta->sta_state != IEEE80211_STA_ASSOC)
1370
WARN(1, "invalid state %d", new_state);
1374
sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1375
sta->sta.addr, new_state);
1378
* notify the driver before the actual changes so it can
1379
* fail the transition
1381
if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1382
int err = drv_sta_state(sta->local, sta->sdata, sta,
1383
sta->sta_state, new_state);
1388
/* reflect the change in all state variables */
1390
switch (new_state) {
1391
case IEEE80211_STA_NONE:
1392
if (sta->sta_state == IEEE80211_STA_AUTH)
1393
clear_bit(WLAN_STA_AUTH, &sta->_flags);
1395
case IEEE80211_STA_AUTH:
1396
if (sta->sta_state == IEEE80211_STA_NONE)
1397
set_bit(WLAN_STA_AUTH, &sta->_flags);
1398
else if (sta->sta_state == IEEE80211_STA_ASSOC)
1399
clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1401
case IEEE80211_STA_ASSOC:
1402
if (sta->sta_state == IEEE80211_STA_AUTH) {
1403
set_bit(WLAN_STA_ASSOC, &sta->_flags);
1404
} else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1405
if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1406
(sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1407
!sta->sdata->u.vlan.sta))
1408
atomic_dec(&sta->sdata->bss->num_mcast_sta);
1409
clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1412
case IEEE80211_STA_AUTHORIZED:
1413
if (sta->sta_state == IEEE80211_STA_ASSOC) {
1414
if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1415
(sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1416
!sta->sdata->u.vlan.sta))
1417
atomic_inc(&sta->sdata->bss->num_mcast_sta);
1418
set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1425
sta->sta_state = new_state;
added
removed
updates/cw-3.6/net/mac80211/sta_info.c
