linux/net/mac80211/sta_info.c
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   1/*
   2 * Copyright 2002-2005, Instant802 Networks, Inc.
   3 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License version 2 as
   7 * published by the Free Software Foundation.
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/init.h>
  12#include <linux/etherdevice.h>
  13#include <linux/netdevice.h>
  14#include <linux/types.h>
  15#include <linux/slab.h>
  16#include <linux/skbuff.h>
  17#include <linux/if_arp.h>
  18#include <linux/timer.h>
  19#include <linux/rtnetlink.h>
  20
  21#include <net/mac80211.h>
  22#include "ieee80211_i.h"
  23#include "driver-ops.h"
  24#include "rate.h"
  25#include "sta_info.h"
  26#include "debugfs_sta.h"
  27#include "mesh.h"
  28#include "wme.h"
  29
  30/**
  31 * DOC: STA information lifetime rules
  32 *
  33 * STA info structures (&struct sta_info) are managed in a hash table
  34 * for faster lookup and a list for iteration. They are managed using
  35 * RCU, i.e. access to the list and hash table is protected by RCU.
  36 *
  37 * Upon allocating a STA info structure with sta_info_alloc(), the caller
  38 * owns that structure. It must then insert it into the hash table using
  39 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
  40 * case (which acquires an rcu read section but must not be called from
  41 * within one) will the pointer still be valid after the call. Note that
  42 * the caller may not do much with the STA info before inserting it, in
  43 * particular, it may not start any mesh peer link management or add
  44 * encryption keys.
  45 *
  46 * When the insertion fails (sta_info_insert()) returns non-zero), the
  47 * structure will have been freed by sta_info_insert()!
  48 *
  49 * Station entries are added by mac80211 when you establish a link with a
  50 * peer. This means different things for the different type of interfaces
  51 * we support. For a regular station this mean we add the AP sta when we
  52 * receive an association response from the AP. For IBSS this occurs when
  53 * get to know about a peer on the same IBSS. For WDS we add the sta for
  54 * the peer immediately upon device open. When using AP mode we add stations
  55 * for each respective station upon request from userspace through nl80211.
  56 *
  57 * In order to remove a STA info structure, various sta_info_destroy_*()
  58 * calls are available.
  59 *
  60 * There is no concept of ownership on a STA entry, each structure is
  61 * owned by the global hash table/list until it is removed. All users of
  62 * the structure need to be RCU protected so that the structure won't be
  63 * freed before they are done using it.
  64 */
  65
  66/* Caller must hold local->sta_mtx */
  67static int sta_info_hash_del(struct ieee80211_local *local,
  68                             struct sta_info *sta)
  69{
  70        struct sta_info *s;
  71
  72        s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
  73                                      lockdep_is_held(&local->sta_mtx));
  74        if (!s)
  75                return -ENOENT;
  76        if (s == sta) {
  77                rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
  78                                   s->hnext);
  79                return 0;
  80        }
  81
  82        while (rcu_access_pointer(s->hnext) &&
  83               rcu_access_pointer(s->hnext) != sta)
  84                s = rcu_dereference_protected(s->hnext,
  85                                        lockdep_is_held(&local->sta_mtx));
  86        if (rcu_access_pointer(s->hnext)) {
  87                rcu_assign_pointer(s->hnext, sta->hnext);
  88                return 0;
  89        }
  90
  91        return -ENOENT;
  92}
  93
  94/* protected by RCU */
  95struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
  96                              const u8 *addr)
  97{
  98        struct ieee80211_local *local = sdata->local;
  99        struct sta_info *sta;
 100
 101        sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
 102                                    lockdep_is_held(&local->sta_mtx));
 103        while (sta) {
 104                if (sta->sdata == sdata &&
 105                    ether_addr_equal(sta->sta.addr, addr))
 106                        break;
 107                sta = rcu_dereference_check(sta->hnext,
 108                                            lockdep_is_held(&local->sta_mtx));
 109        }
 110        return sta;
 111}
 112
 113/*
 114 * Get sta info either from the specified interface
 115 * or from one of its vlans
 116 */
 117struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
 118                                  const u8 *addr)
 119{
 120        struct ieee80211_local *local = sdata->local;
 121        struct sta_info *sta;
 122
 123        sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
 124                                    lockdep_is_held(&local->sta_mtx));
 125        while (sta) {
 126                if ((sta->sdata == sdata ||
 127                     (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
 128                    ether_addr_equal(sta->sta.addr, addr))
 129                        break;
 130                sta = rcu_dereference_check(sta->hnext,
 131                                            lockdep_is_held(&local->sta_mtx));
 132        }
 133        return sta;
 134}
 135
 136struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
 137                                     int idx)
 138{
 139        struct ieee80211_local *local = sdata->local;
 140        struct sta_info *sta;
 141        int i = 0;
 142
 143        list_for_each_entry_rcu(sta, &local->sta_list, list) {
 144                if (sdata != sta->sdata)
 145                        continue;
 146                if (i < idx) {
 147                        ++i;
 148                        continue;
 149                }
 150                return sta;
 151        }
 152
 153        return NULL;
 154}
 155
 156/**
 157 * sta_info_free - free STA
 158 *
 159 * @local: pointer to the global information
 160 * @sta: STA info to free
 161 *
 162 * This function must undo everything done by sta_info_alloc()
 163 * that may happen before sta_info_insert(). It may only be
 164 * called when sta_info_insert() has not been attempted (and
 165 * if that fails, the station is freed anyway.)
 166 */
 167void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
 168{
 169        if (sta->rate_ctrl)
 170                rate_control_free_sta(sta);
 171
 172        sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
 173
 174        kfree(sta);
 175}
 176
 177/* Caller must hold local->sta_mtx */
 178static void sta_info_hash_add(struct ieee80211_local *local,
 179                              struct sta_info *sta)
 180{
 181        lockdep_assert_held(&local->sta_mtx);
 182        sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
 183        rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
 184}
 185
 186static void sta_unblock(struct work_struct *wk)
 187{
 188        struct sta_info *sta;
 189
 190        sta = container_of(wk, struct sta_info, drv_unblock_wk);
 191
 192        if (sta->dead)
 193                return;
 194
 195        if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
 196                local_bh_disable();
 197                ieee80211_sta_ps_deliver_wakeup(sta);
 198                local_bh_enable();
 199        } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
 200                clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
 201
 202                local_bh_disable();
 203                ieee80211_sta_ps_deliver_poll_response(sta);
 204                local_bh_enable();
 205        } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
 206                clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
 207
 208                local_bh_disable();
 209                ieee80211_sta_ps_deliver_uapsd(sta);
 210                local_bh_enable();
 211        } else
 212                clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
 213}
 214
 215static int sta_prepare_rate_control(struct ieee80211_local *local,
 216                                    struct sta_info *sta, gfp_t gfp)
 217{
 218        if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
 219                return 0;
 220
 221        sta->rate_ctrl = local->rate_ctrl;
 222        sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
 223                                                     &sta->sta, gfp);
 224        if (!sta->rate_ctrl_priv)
 225                return -ENOMEM;
 226
 227        return 0;
 228}
 229
 230struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 231                                const u8 *addr, gfp_t gfp)
 232{
 233        struct ieee80211_local *local = sdata->local;
 234        struct sta_info *sta;
 235        struct timespec uptime;
 236        int i;
 237
 238        sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
 239        if (!sta)
 240                return NULL;
 241
 242        spin_lock_init(&sta->lock);
 243        INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
 244        INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
 245        mutex_init(&sta->ampdu_mlme.mtx);
 246
 247        memcpy(sta->sta.addr, addr, ETH_ALEN);
 248        sta->local = local;
 249        sta->sdata = sdata;
 250        sta->last_rx = jiffies;
 251
 252        sta->sta_state = IEEE80211_STA_NONE;
 253
 254        do_posix_clock_monotonic_gettime(&uptime);
 255        sta->last_connected = uptime.tv_sec;
 256        ewma_init(&sta->avg_signal, 1024, 8);
 257
 258        if (sta_prepare_rate_control(local, sta, gfp)) {
 259                kfree(sta);
 260                return NULL;
 261        }
 262
 263        for (i = 0; i < STA_TID_NUM; i++) {
 264                /*
 265                 * timer_to_tid must be initialized with identity mapping
 266                 * to enable session_timer's data differentiation. See
 267                 * sta_rx_agg_session_timer_expired for usage.
 268                 */
 269                sta->timer_to_tid[i] = i;
 270        }
 271        for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 272                skb_queue_head_init(&sta->ps_tx_buf[i]);
 273                skb_queue_head_init(&sta->tx_filtered[i]);
 274        }
 275
 276        for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 277                sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
 278
 279        sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
 280
 281#ifdef CONFIG_MAC80211_MESH
 282        sta->plink_state = NL80211_PLINK_LISTEN;
 283        init_timer(&sta->plink_timer);
 284#endif
 285
 286        return sta;
 287}
 288
 289static int sta_info_insert_check(struct sta_info *sta)
 290{
 291        struct ieee80211_sub_if_data *sdata = sta->sdata;
 292
 293        /*
 294         * Can't be a WARN_ON because it can be triggered through a race:
 295         * something inserts a STA (on one CPU) without holding the RTNL
 296         * and another CPU turns off the net device.
 297         */
 298        if (unlikely(!ieee80211_sdata_running(sdata)))
 299                return -ENETDOWN;
 300
 301        if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
 302                    is_multicast_ether_addr(sta->sta.addr)))
 303                return -EINVAL;
 304
 305        return 0;
 306}
 307
 308static int sta_info_insert_drv_state(struct ieee80211_local *local,
 309                                     struct ieee80211_sub_if_data *sdata,
 310                                     struct sta_info *sta)
 311{
 312        enum ieee80211_sta_state state;
 313        int err = 0;
 314
 315        for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
 316                err = drv_sta_state(local, sdata, sta, state, state + 1);
 317                if (err)
 318                        break;
 319        }
 320
 321        if (!err) {
 322                /*
 323                 * Drivers using legacy sta_add/sta_remove callbacks only
 324                 * get uploaded set to true after sta_add is called.
 325                 */
 326                if (!local->ops->sta_add)
 327                        sta->uploaded = true;
 328                return 0;
 329        }
 330
 331        if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 332                sdata_info(sdata,
 333                           "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
 334                           sta->sta.addr, state + 1, err);
 335                err = 0;
 336        }
 337
 338        /* unwind on error */
 339        for (; state > IEEE80211_STA_NOTEXIST; state--)
 340                WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
 341
 342        return err;
 343}
 344
 345/*
 346 * should be called with sta_mtx locked
 347 * this function replaces the mutex lock
 348 * with a RCU lock
 349 */
 350static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
 351{
 352        struct ieee80211_local *local = sta->local;
 353        struct ieee80211_sub_if_data *sdata = sta->sdata;
 354        struct station_info sinfo;
 355        int err = 0;
 356
 357        lockdep_assert_held(&local->sta_mtx);
 358
 359        /* check if STA exists already */
 360        if (sta_info_get_bss(sdata, sta->sta.addr)) {
 361                err = -EEXIST;
 362                goto out_err;
 363        }
 364
 365        /* notify driver */
 366        err = sta_info_insert_drv_state(local, sdata, sta);
 367        if (err)
 368                goto out_err;
 369
 370        local->num_sta++;
 371        local->sta_generation++;
 372        smp_mb();
 373
 374        /* make the station visible */
 375        sta_info_hash_add(local, sta);
 376
 377        list_add_rcu(&sta->list, &local->sta_list);
 378
 379        set_sta_flag(sta, WLAN_STA_INSERTED);
 380
 381        ieee80211_sta_debugfs_add(sta);
 382        rate_control_add_sta_debugfs(sta);
 383
 384        memset(&sinfo, 0, sizeof(sinfo));
 385        sinfo.filled = 0;
 386        sinfo.generation = local->sta_generation;
 387        cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
 388
 389        sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
 390
 391        /* move reference to rcu-protected */
 392        rcu_read_lock();
 393        mutex_unlock(&local->sta_mtx);
 394
 395        if (ieee80211_vif_is_mesh(&sdata->vif))
 396                mesh_accept_plinks_update(sdata);
 397
 398        return 0;
 399 out_err:
 400        mutex_unlock(&local->sta_mtx);
 401        rcu_read_lock();
 402        return err;
 403}
 404
 405int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
 406{
 407        struct ieee80211_local *local = sta->local;
 408        int err = 0;
 409
 410        might_sleep();
 411
 412        err = sta_info_insert_check(sta);
 413        if (err) {
 414                rcu_read_lock();
 415                goto out_free;
 416        }
 417
 418        mutex_lock(&local->sta_mtx);
 419
 420        err = sta_info_insert_finish(sta);
 421        if (err)
 422                goto out_free;
 423
 424        return 0;
 425 out_free:
 426        BUG_ON(!err);
 427        sta_info_free(local, sta);
 428        return err;
 429}
 430
 431int sta_info_insert(struct sta_info *sta)
 432{
 433        int err = sta_info_insert_rcu(sta);
 434
 435        rcu_read_unlock();
 436
 437        return err;
 438}
 439
 440static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
 441{
 442        /*
 443         * This format has been mandated by the IEEE specifications,
 444         * so this line may not be changed to use the __set_bit() format.
 445         */
 446        bss->tim[aid / 8] |= (1 << (aid % 8));
 447}
 448
 449static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
 450{
 451        /*
 452         * This format has been mandated by the IEEE specifications,
 453         * so this line may not be changed to use the __clear_bit() format.
 454         */
 455        bss->tim[aid / 8] &= ~(1 << (aid % 8));
 456}
 457
 458static unsigned long ieee80211_tids_for_ac(int ac)
 459{
 460        /* If we ever support TIDs > 7, this obviously needs to be adjusted */
 461        switch (ac) {
 462        case IEEE80211_AC_VO:
 463                return BIT(6) | BIT(7);
 464        case IEEE80211_AC_VI:
 465                return BIT(4) | BIT(5);
 466        case IEEE80211_AC_BE:
 467                return BIT(0) | BIT(3);
 468        case IEEE80211_AC_BK:
 469                return BIT(1) | BIT(2);
 470        default:
 471                WARN_ON(1);
 472                return 0;
 473        }
 474}
 475
 476void sta_info_recalc_tim(struct sta_info *sta)
 477{
 478        struct ieee80211_local *local = sta->local;
 479        struct ieee80211_if_ap *bss = sta->sdata->bss;
 480        unsigned long flags;
 481        bool indicate_tim = false;
 482        u8 ignore_for_tim = sta->sta.uapsd_queues;
 483        int ac;
 484
 485        if (WARN_ON_ONCE(!sta->sdata->bss))
 486                return;
 487
 488        /* No need to do anything if the driver does all */
 489        if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
 490                return;
 491
 492        if (sta->dead)
 493                goto done;
 494
 495        /*
 496         * If all ACs are delivery-enabled then we should build
 497         * the TIM bit for all ACs anyway; if only some are then
 498         * we ignore those and build the TIM bit using only the
 499         * non-enabled ones.
 500         */
 501        if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
 502                ignore_for_tim = 0;
 503
 504        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 505                unsigned long tids;
 506
 507                if (ignore_for_tim & BIT(ac))
 508                        continue;
 509
 510                indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
 511                                !skb_queue_empty(&sta->ps_tx_buf[ac]);
 512                if (indicate_tim)
 513                        break;
 514
 515                tids = ieee80211_tids_for_ac(ac);
 516
 517                indicate_tim |=
 518                        sta->driver_buffered_tids & tids;
 519        }
 520
 521 done:
 522        spin_lock_irqsave(&local->tim_lock, flags);
 523
 524        if (indicate_tim)
 525                __bss_tim_set(bss, sta->sta.aid);
 526        else
 527                __bss_tim_clear(bss, sta->sta.aid);
 528
 529        if (local->ops->set_tim) {
 530                local->tim_in_locked_section = true;
 531                drv_set_tim(local, &sta->sta, indicate_tim);
 532                local->tim_in_locked_section = false;
 533        }
 534
 535        spin_unlock_irqrestore(&local->tim_lock, flags);
 536}
 537
 538static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
 539{
 540        struct ieee80211_tx_info *info;
 541        int timeout;
 542
 543        if (!skb)
 544                return false;
 545
 546        info = IEEE80211_SKB_CB(skb);
 547
 548        /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
 549        timeout = (sta->listen_interval *
 550                   sta->sdata->vif.bss_conf.beacon_int *
 551                   32 / 15625) * HZ;
 552        if (timeout < STA_TX_BUFFER_EXPIRE)
 553                timeout = STA_TX_BUFFER_EXPIRE;
 554        return time_after(jiffies, info->control.jiffies + timeout);
 555}
 556
 557
 558static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
 559                                                struct sta_info *sta, int ac)
 560{
 561        unsigned long flags;
 562        struct sk_buff *skb;
 563
 564        /*
 565         * First check for frames that should expire on the filtered
 566         * queue. Frames here were rejected by the driver and are on
 567         * a separate queue to avoid reordering with normal PS-buffered
 568         * frames. They also aren't accounted for right now in the
 569         * total_ps_buffered counter.
 570         */
 571        for (;;) {
 572                spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
 573                skb = skb_peek(&sta->tx_filtered[ac]);
 574                if (sta_info_buffer_expired(sta, skb))
 575                        skb = __skb_dequeue(&sta->tx_filtered[ac]);
 576                else
 577                        skb = NULL;
 578                spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
 579
 580                /*
 581                 * Frames are queued in order, so if this one
 582                 * hasn't expired yet we can stop testing. If
 583                 * we actually reached the end of the queue we
 584                 * also need to stop, of course.
 585                 */
 586                if (!skb)
 587                        break;
 588                ieee80211_free_txskb(&local->hw, skb);
 589        }
 590
 591        /*
 592         * Now also check the normal PS-buffered queue, this will
 593         * only find something if the filtered queue was emptied
 594         * since the filtered frames are all before the normal PS
 595         * buffered frames.
 596         */
 597        for (;;) {
 598                spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
 599                skb = skb_peek(&sta->ps_tx_buf[ac]);
 600                if (sta_info_buffer_expired(sta, skb))
 601                        skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
 602                else
 603                        skb = NULL;
 604                spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
 605
 606                /*
 607                 * 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
 610                 */
 611                if (!skb)
 612                        break;
 613
 614                local->total_ps_buffered--;
 615                ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
 616                       sta->sta.addr);
 617                ieee80211_free_txskb(&local->hw, skb);
 618        }
 619
 620        /*
 621         * Finally, recalculate the TIM bit for this station -- it might
 622         * now be clear because the station was too slow to retrieve its
 623         * frames.
 624         */
 625        sta_info_recalc_tim(sta);
 626
 627        /*
 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.
 631         */
 632        return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
 633                 skb_queue_empty(&sta->tx_filtered[ac]));
 634}
 635
 636static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
 637                                             struct sta_info *sta)
 638{
 639        bool have_buffered = false;
 640        int ac;
 641
 642        /* This is only necessary for stations on BSS interfaces */
 643        if (!sta->sdata->bss)
 644                return false;
 645
 646        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 647                have_buffered |=
 648                        sta_info_cleanup_expire_buffered_ac(local, sta, ac);
 649
 650        return have_buffered;
 651}
 652
 653int __must_check __sta_info_destroy(struct sta_info *sta)
 654{
 655        struct ieee80211_local *local;
 656        struct ieee80211_sub_if_data *sdata;
 657        int ret, i, ac;
 658        struct tid_ampdu_tx *tid_tx;
 659
 660        might_sleep();
 661
 662        if (!sta)
 663                return -ENOENT;
 664
 665        local = sta->local;
 666        sdata = sta->sdata;
 667
 668        lockdep_assert_held(&local->sta_mtx);
 669
 670        /*
 671         * 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.
 675         */
 676        set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 677        ieee80211_sta_tear_down_BA_sessions(sta, true);
 678
 679        ret = sta_info_hash_del(local, sta);
 680        if (ret)
 681                return ret;
 682
 683        list_del_rcu(&sta->list);
 684
 685        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]));
 688        if (sta->ptk)
 689                __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
 690        mutex_unlock(&local->key_mtx);
 691
 692        sta->dead = true;
 693
 694        local->num_sta--;
 695        local->sta_generation++;
 696
 697        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 698                RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
 699
 700        while (sta->sta_state > IEEE80211_STA_NONE) {
 701                ret = sta_info_move_state(sta, sta->sta_state - 1);
 702                if (ret) {
 703                        WARN_ON_ONCE(1);
 704                        break;
 705                }
 706        }
 707
 708        if (sta->uploaded) {
 709                ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
 710                                    IEEE80211_STA_NOTEXIST);
 711                WARN_ON_ONCE(ret != 0);
 712        }
 713
 714        /*
 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.
 719         */
 720        synchronize_rcu();
 721
 722        if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
 723                BUG_ON(!sdata->bss);
 724
 725                clear_sta_flag(sta, WLAN_STA_PS_STA);
 726
 727                atomic_dec(&sdata->bss->num_sta_ps);
 728                sta_info_recalc_tim(sta);
 729        }
 730
 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]);
 735        }
 736
 737#ifdef CONFIG_MAC80211_MESH
 738        if (ieee80211_vif_is_mesh(&sdata->vif))
 739                mesh_accept_plinks_update(sdata);
 740#endif
 741
 742        sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
 743
 744        cancel_work_sync(&sta->drv_unblock_wk);
 745
 746        cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
 747
 748        rate_control_remove_sta_debugfs(sta);
 749        ieee80211_sta_debugfs_remove(sta);
 750
 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);
 755        }
 756#endif
 757
 758        /*
 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.
 763         */
 764        for (i = 0; i < STA_TID_NUM; i++) {
 765                tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
 766                if (!tid_tx)
 767                        continue;
 768                __skb_queue_purge(&tid_tx->pending);
 769                kfree(tid_tx);
 770        }
 771
 772        sta_info_free(local, sta);
 773
 774        return 0;
 775}
 776
 777int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
 778{
 779        struct sta_info *sta;
 780        int ret;
 781
 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);
 786
 787        return ret;
 788}
 789
 790int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
 791                              const u8 *addr)
 792{
 793        struct sta_info *sta;
 794        int ret;
 795
 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);
 800
 801        return ret;
 802}
 803
 804static void sta_info_cleanup(unsigned long data)
 805{
 806        struct ieee80211_local *local = (struct ieee80211_local *) data;
 807        struct sta_info *sta;
 808        bool timer_needed = false;
 809
 810        rcu_read_lock();
 811        list_for_each_entry_rcu(sta, &local->sta_list, list)
 812                if (sta_info_cleanup_expire_buffered(local, sta))
 813                        timer_needed = true;
 814        rcu_read_unlock();
 815
 816        if (local->quiescing)
 817                return;
 818
 819        if (!timer_needed)
 820                return;
 821
 822        mod_timer(&local->sta_cleanup,
 823                  round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
 824}
 825
 826void sta_info_init(struct ieee80211_local *local)
 827{
 828        spin_lock_init(&local->tim_lock);
 829        mutex_init(&local->sta_mtx);
 830        INIT_LIST_HEAD(&local->sta_list);
 831
 832        setup_timer(&local->sta_cleanup, sta_info_cleanup,
 833                    (unsigned long)local);
 834}
 835
 836void sta_info_stop(struct ieee80211_local *local)
 837{
 838        del_timer(&local->sta_cleanup);
 839        sta_info_flush(local, NULL);
 840}
 841
 842/**
 843 * sta_info_flush - flush matching STA entries from the STA table
 844 *
 845 * Returns the number of removed STA entries.
 846 *
 847 * @local: local interface data
 848 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
 849 */
 850int sta_info_flush(struct ieee80211_local *local,
 851                   struct ieee80211_sub_if_data *sdata)
 852{
 853        struct sta_info *sta, *tmp;
 854        int ret = 0;
 855
 856        might_sleep();
 857
 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));
 862                        ret++;
 863                }
 864        }
 865        mutex_unlock(&local->sta_mtx);
 866
 867        return ret;
 868}
 869
 870void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
 871                          unsigned long exp_time)
 872{
 873        struct ieee80211_local *local = sdata->local;
 874        struct sta_info *sta, *tmp;
 875
 876        mutex_lock(&local->sta_mtx);
 877
 878        list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
 879                if (sdata != sta->sdata)
 880                        continue;
 881
 882                if (time_after(jiffies, sta->last_rx + exp_time)) {
 883                        ibss_dbg(sdata, "expiring inactive STA %pM\n",
 884                                 sta->sta.addr);
 885                        WARN_ON(__sta_info_destroy(sta));
 886                }
 887        }
 888
 889        mutex_unlock(&local->sta_mtx);
 890}
 891
 892struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
 893                                               const u8 *addr,
 894                                               const u8 *localaddr)
 895{
 896        struct sta_info *sta, *nxt;
 897
 898        /*
 899         * Just return a random station if localaddr is NULL
 900         * ... first in list.
 901         */
 902        for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
 903                if (localaddr &&
 904                    !ether_addr_equal(sta->sdata->vif.addr, localaddr))
 905                        continue;
 906                if (!sta->uploaded)
 907                        return NULL;
 908                return &sta->sta;
 909        }
 910
 911        return NULL;
 912}
 913EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
 914
 915struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
 916                                         const u8 *addr)
 917{
 918        struct sta_info *sta;
 919
 920        if (!vif)
 921                return NULL;
 922
 923        sta = sta_info_get_bss(vif_to_sdata(vif), addr);
 924        if (!sta)
 925                return NULL;
 926
 927        if (!sta->uploaded)
 928                return NULL;
 929
 930        return &sta->sta;
 931}
 932EXPORT_SYMBOL(ieee80211_find_sta);
 933
 934static void clear_sta_ps_flags(void *_sta)
 935{
 936        struct sta_info *sta = _sta;
 937        struct ieee80211_sub_if_data *sdata = sta->sdata;
 938
 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);
 942}
 943
 944/* powersave support code */
 945void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
 946{
 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;
 951
 952        clear_sta_flag(sta, WLAN_STA_SP);
 953
 954        BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1);
 955        sta->driver_buffered_tids = 0;
 956
 957        if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
 958                drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
 959
 960        skb_queue_head_init(&pending);
 961
 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;
 965
 966                skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
 967                tmp = skb_queue_len(&pending);
 968                filtered += tmp - count;
 969                count = tmp;
 970
 971                skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
 972                tmp = skb_queue_len(&pending);
 973                buffered += tmp - count;
 974        }
 975
 976        ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
 977
 978        local->total_ps_buffered -= buffered;
 979
 980        sta_info_recalc_tim(sta);
 981
 982        ps_dbg(sdata,
 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);
 985}
 986
 987static 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)
 990{
 991        struct ieee80211_local *local = sdata->local;
 992        struct ieee80211_qos_hdr *nullfunc;
 993        struct sk_buff *skb;
 994        int size = sizeof(*nullfunc);
 995        __le16 fc;
 996        bool qos = test_sta_flag(sta, WLAN_STA_WME);
 997        struct ieee80211_tx_info *info;
 998
 999        if (qos) {
1000                fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1001                                 IEEE80211_STYPE_QOS_NULLFUNC |
1002                                 IEEE80211_FCTL_FROMDS);
1003        } else {
1004                size -= 2;
1005                fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1006                                 IEEE80211_STYPE_NULLFUNC |
1007                                 IEEE80211_FCTL_FROMDS);
1008        }
1009
1010        skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1011        if (!skb)
1012                return;
1013
1014        skb_reserve(skb, local->hw.extra_tx_headroom);
1015
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);
1022
1023        skb->priority = tid;
1024        skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1025        if (qos) {
1026                nullfunc->qos_ctrl = cpu_to_le16(tid);
1027
1028                if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1029                        nullfunc->qos_ctrl |=
1030                                cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1031        }
1032
1033        info = IEEE80211_SKB_CB(skb);
1034
1035        /*
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.
1040         */
1041        info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1042                       IEEE80211_TX_STATUS_EOSP |
1043                       IEEE80211_TX_CTL_REQ_TX_STATUS;
1044
1045        drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1046
1047        ieee80211_xmit(sdata, skb);
1048}
1049
1050static void
1051ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1052                                  int n_frames, u8 ignored_acs,
1053                                  enum ieee80211_frame_release_type reason)
1054{
1055        struct ieee80211_sub_if_data *sdata = sta->sdata;
1056        struct ieee80211_local *local = sdata->local;
1057        bool found = false;
1058        bool more_data = false;
1059        int ac;
1060        unsigned long driver_release_tids = 0;
1061        struct sk_buff_head frames;
1062
1063        /* Service or PS-Poll period starts */
1064        set_sta_flag(sta, WLAN_STA_SP);
1065
1066        __skb_queue_head_init(&frames);
1067
1068        /*
1069         * Get response frame(s) and more data bit for it.
1070         */
1071        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1072                unsigned long tids;
1073
1074                if (ignored_acs & BIT(ac))
1075                        continue;
1076
1077                tids = ieee80211_tids_for_ac(ac);
1078
1079                if (!found) {
1080                        driver_release_tids = sta->driver_buffered_tids & tids;
1081                        if (driver_release_tids) {
1082                                found = true;
1083                        } else {
1084                                struct sk_buff *skb;
1085
1086                                while (n_frames > 0) {
1087                                        skb = skb_dequeue(&sta->tx_filtered[ac]);
1088                                        if (!skb) {
1089                                                skb = skb_dequeue(
1090                                                        &sta->ps_tx_buf[ac]);
1091                                                if (skb)
1092                                                        local->total_ps_buffered--;
1093                                        }
1094                                        if (!skb)
1095                                                break;
1096                                        n_frames--;
1097                                        found = true;
1098                                        __skb_queue_tail(&frames, skb);
1099                                }
1100                        }
1101
1102                        /*
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).
1106                         */
1107                        if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1108                            hweight16(driver_release_tids) > 1) {
1109                                more_data = true;
1110                                driver_release_tids =
1111                                        BIT(ffs(driver_release_tids) - 1);
1112                                break;
1113                        }
1114                }
1115
1116                if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1117                    !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1118                        more_data = true;
1119                        break;
1120                }
1121        }
1122
1123        if (!found) {
1124                int tid;
1125
1126                /*
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.
1130                 *
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.
1137                 *
1138                 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1139                 */
1140
1141                /* This will evaluate to 1, 3, 5 or 7. */
1142                tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1143
1144                ieee80211_send_null_response(sdata, sta, tid, reason);
1145                return;
1146        }
1147
1148        if (!driver_release_tids) {
1149                struct sk_buff_head pending;
1150                struct sk_buff *skb;
1151                int num = 0;
1152                u16 tids = 0;
1153
1154                skb_queue_head_init(&pending);
1155
1156                while ((skb = __skb_dequeue(&frames))) {
1157                        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1158                        struct ieee80211_hdr *hdr = (void *) skb->data;
1159                        u8 *qoshdr = NULL;
1160
1161                        num++;
1162
1163                        /*
1164                         * Tell TX path to send this frame even though the
1165                         * STA may still remain is PS mode after this frame
1166                         * exchange.
1167                         */
1168                        info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1169
1170                        /*
1171                         * Use MoreData flag to indicate whether there are
1172                         * more buffered frames for this STA
1173                         */
1174                        if (more_data || !skb_queue_empty(&frames))
1175                                hdr->frame_control |=
1176                                        cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1177                        else
1178                                hdr->frame_control &=
1179                                        cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1180
1181                        if (ieee80211_is_data_qos(hdr->frame_control) ||
1182                            ieee80211_is_qos_nullfunc(hdr->frame_control))
1183                                qoshdr = ieee80211_get_qos_ctl(hdr);
1184
1185                        /* end service period after last frame */
1186                        if (skb_queue_empty(&frames)) {
1187                                if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1188                                    qoshdr)
1189                                        *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1190
1191                                info->flags |= IEEE80211_TX_STATUS_EOSP |
1192                                               IEEE80211_TX_CTL_REQ_TX_STATUS;
1193                        }
1194
1195                        if (qoshdr)
1196                                tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1197                        else
1198                                tids |= BIT(0);
1199
1200                        __skb_queue_tail(&pending, skb);
1201                }
1202
1203                drv_allow_buffered_frames(local, sta, tids, num,
1204                                          reason, more_data);
1205
1206                ieee80211_add_pending_skbs(local, &pending);
1207
1208                sta_info_recalc_tim(sta);
1209        } else {
1210                /*
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.
1219                 */
1220                drv_release_buffered_frames(local, sta, driver_release_tids,
1221                                            n_frames, reason, more_data);
1222
1223                /*
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
1227                 * release function.
1228                 * Either way, however, when the driver tells us that the TID
1229                 * became empty we'll do the TIM recalculation.
1230                 */
1231        }
1232}
1233
1234void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1235{
1236        u8 ignore_for_response = sta->sta.uapsd_queues;
1237
1238        /*
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.
1242         */
1243        if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1244                ignore_for_response = 0;
1245
1246        ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1247                                          IEEE80211_FRAME_RELEASE_PSPOLL);
1248}
1249
1250void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1251{
1252        int n_frames = sta->sta.max_sp;
1253        u8 delivery_enabled = sta->sta.uapsd_queues;
1254
1255        /*
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.
1260         */
1261        if (!delivery_enabled)
1262                return;
1263
1264        switch (sta->sta.max_sp) {
1265        case 1:
1266                n_frames = 2;
1267                break;
1268        case 2:
1269                n_frames = 4;
1270                break;
1271        case 3:
1272                n_frames = 6;
1273                break;
1274        case 0:
1275                /* XXX: what is a good value? */
1276                n_frames = 8;
1277                break;
1278        }
1279
1280        ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1281                                          IEEE80211_FRAME_RELEASE_UAPSD);
1282}
1283
1284void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1285                               struct ieee80211_sta *pubsta, bool block)
1286{
1287        struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1288
1289        trace_api_sta_block_awake(sta->local, pubsta, block);
1290
1291        if (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);
1295}
1296EXPORT_SYMBOL(ieee80211_sta_block_awake);
1297
1298void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
1299{
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;
1304
1305        trace_api_eosp(local, pubsta);
1306
1307        skb = alloc_skb(0, GFP_ATOMIC);
1308        if (!skb) {
1309                /* too bad ... but race is better than loss */
1310                clear_sta_flag(sta, WLAN_STA_SP);
1311                return;
1312        }
1313
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);
1320}
1321EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
1322
1323void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1324                                u8 tid, bool buffered)
1325{
1326        struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1327
1328        if (WARN_ON(tid >= STA_TID_NUM))
1329                return;
1330
1331        if (buffered)
1332                set_bit(tid, &sta->driver_buffered_tids);
1333        else
1334                clear_bit(tid, &sta->driver_buffered_tids);
1335
1336        sta_info_recalc_tim(sta);
1337}
1338EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1339
1340int sta_info_move_state(struct sta_info *sta,
1341                        enum ieee80211_sta_state new_state)
1342{
1343        might_sleep();
1344
1345        if (sta->sta_state == new_state)
1346                return 0;
1347
1348        /* check allowed transitions first */
1349
1350        switch (new_state) {
1351        case IEEE80211_STA_NONE:
1352                if (sta->sta_state != IEEE80211_STA_AUTH)
1353                        return -EINVAL;
1354                break;
1355        case IEEE80211_STA_AUTH:
1356                if (sta->sta_state != IEEE80211_STA_NONE &&
1357                    sta->sta_state != IEEE80211_STA_ASSOC)
1358                        return -EINVAL;
1359                break;
1360        case IEEE80211_STA_ASSOC:
1361                if (sta->sta_state != IEEE80211_STA_AUTH &&
1362                    sta->sta_state != IEEE80211_STA_AUTHORIZED)
1363                        return -EINVAL;
1364                break;
1365        case IEEE80211_STA_AUTHORIZED:
1366                if (sta->sta_state != IEEE80211_STA_ASSOC)
1367                        return -EINVAL;
1368                break;
1369        default:
1370                WARN(1, "invalid state %d", new_state);
1371                return -EINVAL;
1372        }
1373
1374        sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1375                sta->sta.addr, new_state);
1376
1377        /*
1378         * notify the driver before the actual changes so it can
1379         * fail the transition
1380         */
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);
1384                if (err)
1385                        return err;
1386        }
1387
1388        /* reflect the change in all state variables */
1389
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);
1394                break;
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);
1400                break;
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);
1410                }
1411                break;
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);
1419                }
1420                break;
1421        default:
1422                break;
1423        }
1424
1425        sta->sta_state = new_state;
1426
1427        return 0;
1428}
1429
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