linux/net/mac80211/sta_info.c
<<
>>
Prefs
   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
  94static void free_sta_work(struct work_struct *wk)
  95{
  96        struct sta_info *sta = container_of(wk, struct sta_info, free_sta_wk);
  97        int ac, i;
  98        struct tid_ampdu_tx *tid_tx;
  99        struct ieee80211_sub_if_data *sdata = sta->sdata;
 100        struct ieee80211_local *local = sdata->local;
 101
 102        /*
 103         * At this point, when being called as call_rcu callback,
 104         * neither mac80211 nor the driver can reference this
 105         * sta struct any more except by still existing timers
 106         * associated with this station that we clean up below.
 107         */
 108
 109        if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
 110                BUG_ON(!sdata->bss);
 111
 112                clear_sta_flag(sta, WLAN_STA_PS_STA);
 113
 114                atomic_dec(&sdata->bss->num_sta_ps);
 115                sta_info_recalc_tim(sta);
 116        }
 117
 118        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 119                local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
 120                ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
 121                ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
 122        }
 123
 124#ifdef CONFIG_MAC80211_MESH
 125        if (ieee80211_vif_is_mesh(&sdata->vif)) {
 126                mesh_accept_plinks_update(sdata);
 127                mesh_plink_deactivate(sta);
 128                del_timer_sync(&sta->plink_timer);
 129        }
 130#endif
 131
 132        cancel_work_sync(&sta->drv_unblock_wk);
 133
 134        /*
 135         * Destroy aggregation state here. It would be nice to wait for the
 136         * driver to finish aggregation stop and then clean up, but for now
 137         * drivers have to handle aggregation stop being requested, followed
 138         * directly by station destruction.
 139         */
 140        for (i = 0; i < STA_TID_NUM; i++) {
 141                tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
 142                if (!tid_tx)
 143                        continue;
 144                ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
 145                kfree(tid_tx);
 146        }
 147
 148        sta_info_free(local, sta);
 149}
 150
 151static void free_sta_rcu(struct rcu_head *h)
 152{
 153        struct sta_info *sta = container_of(h, struct sta_info, rcu_head);
 154
 155        ieee80211_queue_work(&sta->local->hw, &sta->free_sta_wk);
 156}
 157
 158/* protected by RCU */
 159struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
 160                              const u8 *addr)
 161{
 162        struct ieee80211_local *local = sdata->local;
 163        struct sta_info *sta;
 164
 165        sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
 166                                    lockdep_is_held(&local->sta_mtx));
 167        while (sta) {
 168                if (sta->sdata == sdata &&
 169                    ether_addr_equal(sta->sta.addr, addr))
 170                        break;
 171                sta = rcu_dereference_check(sta->hnext,
 172                                            lockdep_is_held(&local->sta_mtx));
 173        }
 174        return sta;
 175}
 176
 177/*
 178 * Get sta info either from the specified interface
 179 * or from one of its vlans
 180 */
 181struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
 182                                  const u8 *addr)
 183{
 184        struct ieee80211_local *local = sdata->local;
 185        struct sta_info *sta;
 186
 187        sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
 188                                    lockdep_is_held(&local->sta_mtx));
 189        while (sta) {
 190                if ((sta->sdata == sdata ||
 191                     (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
 192                    ether_addr_equal(sta->sta.addr, addr))
 193                        break;
 194                sta = rcu_dereference_check(sta->hnext,
 195                                            lockdep_is_held(&local->sta_mtx));
 196        }
 197        return sta;
 198}
 199
 200struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
 201                                     int idx)
 202{
 203        struct ieee80211_local *local = sdata->local;
 204        struct sta_info *sta;
 205        int i = 0;
 206
 207        list_for_each_entry_rcu(sta, &local->sta_list, list) {
 208                if (sdata != sta->sdata)
 209                        continue;
 210                if (i < idx) {
 211                        ++i;
 212                        continue;
 213                }
 214                return sta;
 215        }
 216
 217        return NULL;
 218}
 219
 220/**
 221 * sta_info_free - free STA
 222 *
 223 * @local: pointer to the global information
 224 * @sta: STA info to free
 225 *
 226 * This function must undo everything done by sta_info_alloc()
 227 * that may happen before sta_info_insert(). It may only be
 228 * called when sta_info_insert() has not been attempted (and
 229 * if that fails, the station is freed anyway.)
 230 */
 231void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
 232{
 233        if (sta->rate_ctrl)
 234                rate_control_free_sta(sta);
 235
 236        sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
 237
 238        kfree(sta);
 239}
 240
 241/* Caller must hold local->sta_mtx */
 242static void sta_info_hash_add(struct ieee80211_local *local,
 243                              struct sta_info *sta)
 244{
 245        lockdep_assert_held(&local->sta_mtx);
 246        sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
 247        rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
 248}
 249
 250static void sta_unblock(struct work_struct *wk)
 251{
 252        struct sta_info *sta;
 253
 254        sta = container_of(wk, struct sta_info, drv_unblock_wk);
 255
 256        if (sta->dead)
 257                return;
 258
 259        if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
 260                local_bh_disable();
 261                ieee80211_sta_ps_deliver_wakeup(sta);
 262                local_bh_enable();
 263        } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
 264                clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
 265
 266                local_bh_disable();
 267                ieee80211_sta_ps_deliver_poll_response(sta);
 268                local_bh_enable();
 269        } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
 270                clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
 271
 272                local_bh_disable();
 273                ieee80211_sta_ps_deliver_uapsd(sta);
 274                local_bh_enable();
 275        } else
 276                clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
 277}
 278
 279static int sta_prepare_rate_control(struct ieee80211_local *local,
 280                                    struct sta_info *sta, gfp_t gfp)
 281{
 282        if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
 283                return 0;
 284
 285        sta->rate_ctrl = local->rate_ctrl;
 286        sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
 287                                                     &sta->sta, gfp);
 288        if (!sta->rate_ctrl_priv)
 289                return -ENOMEM;
 290
 291        return 0;
 292}
 293
 294struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 295                                const u8 *addr, gfp_t gfp)
 296{
 297        struct ieee80211_local *local = sdata->local;
 298        struct sta_info *sta;
 299        struct timespec uptime;
 300        int i;
 301
 302        sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
 303        if (!sta)
 304                return NULL;
 305
 306        spin_lock_init(&sta->lock);
 307        INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
 308        INIT_WORK(&sta->free_sta_wk, free_sta_work);
 309        INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
 310        mutex_init(&sta->ampdu_mlme.mtx);
 311
 312        memcpy(sta->sta.addr, addr, ETH_ALEN);
 313        sta->local = local;
 314        sta->sdata = sdata;
 315        sta->last_rx = jiffies;
 316
 317        sta->sta_state = IEEE80211_STA_NONE;
 318
 319        do_posix_clock_monotonic_gettime(&uptime);
 320        sta->last_connected = uptime.tv_sec;
 321        ewma_init(&sta->avg_signal, 1024, 8);
 322
 323        if (sta_prepare_rate_control(local, sta, gfp)) {
 324                kfree(sta);
 325                return NULL;
 326        }
 327
 328        for (i = 0; i < STA_TID_NUM; i++) {
 329                /*
 330                 * timer_to_tid must be initialized with identity mapping
 331                 * to enable session_timer's data differentiation. See
 332                 * sta_rx_agg_session_timer_expired for usage.
 333                 */
 334                sta->timer_to_tid[i] = i;
 335        }
 336        for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 337                skb_queue_head_init(&sta->ps_tx_buf[i]);
 338                skb_queue_head_init(&sta->tx_filtered[i]);
 339        }
 340
 341        for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
 342                sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
 343
 344        sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
 345
 346#ifdef CONFIG_MAC80211_MESH
 347        sta->plink_state = NL80211_PLINK_LISTEN;
 348        init_timer(&sta->plink_timer);
 349#endif
 350
 351        return sta;
 352}
 353
 354static int sta_info_insert_check(struct sta_info *sta)
 355{
 356        struct ieee80211_sub_if_data *sdata = sta->sdata;
 357
 358        /*
 359         * Can't be a WARN_ON because it can be triggered through a race:
 360         * something inserts a STA (on one CPU) without holding the RTNL
 361         * and another CPU turns off the net device.
 362         */
 363        if (unlikely(!ieee80211_sdata_running(sdata)))
 364                return -ENETDOWN;
 365
 366        if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
 367                    is_multicast_ether_addr(sta->sta.addr)))
 368                return -EINVAL;
 369
 370        return 0;
 371}
 372
 373static int sta_info_insert_drv_state(struct ieee80211_local *local,
 374                                     struct ieee80211_sub_if_data *sdata,
 375                                     struct sta_info *sta)
 376{
 377        enum ieee80211_sta_state state;
 378        int err = 0;
 379
 380        for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
 381                err = drv_sta_state(local, sdata, sta, state, state + 1);
 382                if (err)
 383                        break;
 384        }
 385
 386        if (!err) {
 387                /*
 388                 * Drivers using legacy sta_add/sta_remove callbacks only
 389                 * get uploaded set to true after sta_add is called.
 390                 */
 391                if (!local->ops->sta_add)
 392                        sta->uploaded = true;
 393                return 0;
 394        }
 395
 396        if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 397                sdata_info(sdata,
 398                           "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
 399                           sta->sta.addr, state + 1, err);
 400                err = 0;
 401        }
 402
 403        /* unwind on error */
 404        for (; state > IEEE80211_STA_NOTEXIST; state--)
 405                WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
 406
 407        return err;
 408}
 409
 410/*
 411 * should be called with sta_mtx locked
 412 * this function replaces the mutex lock
 413 * with a RCU lock
 414 */
 415static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
 416{
 417        struct ieee80211_local *local = sta->local;
 418        struct ieee80211_sub_if_data *sdata = sta->sdata;
 419        struct station_info sinfo;
 420        int err = 0;
 421
 422        lockdep_assert_held(&local->sta_mtx);
 423
 424        /* check if STA exists already */
 425        if (sta_info_get_bss(sdata, sta->sta.addr)) {
 426                err = -EEXIST;
 427                goto out_err;
 428        }
 429
 430        /* notify driver */
 431        err = sta_info_insert_drv_state(local, sdata, sta);
 432        if (err)
 433                goto out_err;
 434
 435        local->num_sta++;
 436        local->sta_generation++;
 437        smp_mb();
 438
 439        /* make the station visible */
 440        sta_info_hash_add(local, sta);
 441
 442        list_add_rcu(&sta->list, &local->sta_list);
 443
 444        set_sta_flag(sta, WLAN_STA_INSERTED);
 445
 446        ieee80211_sta_debugfs_add(sta);
 447        rate_control_add_sta_debugfs(sta);
 448
 449        memset(&sinfo, 0, sizeof(sinfo));
 450        sinfo.filled = 0;
 451        sinfo.generation = local->sta_generation;
 452        cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
 453
 454        sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
 455
 456        /* move reference to rcu-protected */
 457        rcu_read_lock();
 458        mutex_unlock(&local->sta_mtx);
 459
 460        if (ieee80211_vif_is_mesh(&sdata->vif))
 461                mesh_accept_plinks_update(sdata);
 462
 463        return 0;
 464 out_err:
 465        mutex_unlock(&local->sta_mtx);
 466        rcu_read_lock();
 467        return err;
 468}
 469
 470int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
 471{
 472        struct ieee80211_local *local = sta->local;
 473        int err = 0;
 474
 475        might_sleep();
 476
 477        err = sta_info_insert_check(sta);
 478        if (err) {
 479                rcu_read_lock();
 480                goto out_free;
 481        }
 482
 483        mutex_lock(&local->sta_mtx);
 484
 485        err = sta_info_insert_finish(sta);
 486        if (err)
 487                goto out_free;
 488
 489        return 0;
 490 out_free:
 491        BUG_ON(!err);
 492        sta_info_free(local, sta);
 493        return err;
 494}
 495
 496int sta_info_insert(struct sta_info *sta)
 497{
 498        int err = sta_info_insert_rcu(sta);
 499
 500        rcu_read_unlock();
 501
 502        return err;
 503}
 504
 505static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
 506{
 507        /*
 508         * This format has been mandated by the IEEE specifications,
 509         * so this line may not be changed to use the __set_bit() format.
 510         */
 511        bss->tim[aid / 8] |= (1 << (aid % 8));
 512}
 513
 514static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
 515{
 516        /*
 517         * This format has been mandated by the IEEE specifications,
 518         * so this line may not be changed to use the __clear_bit() format.
 519         */
 520        bss->tim[aid / 8] &= ~(1 << (aid % 8));
 521}
 522
 523static unsigned long ieee80211_tids_for_ac(int ac)
 524{
 525        /* If we ever support TIDs > 7, this obviously needs to be adjusted */
 526        switch (ac) {
 527        case IEEE80211_AC_VO:
 528                return BIT(6) | BIT(7);
 529        case IEEE80211_AC_VI:
 530                return BIT(4) | BIT(5);
 531        case IEEE80211_AC_BE:
 532                return BIT(0) | BIT(3);
 533        case IEEE80211_AC_BK:
 534                return BIT(1) | BIT(2);
 535        default:
 536                WARN_ON(1);
 537                return 0;
 538        }
 539}
 540
 541void sta_info_recalc_tim(struct sta_info *sta)
 542{
 543        struct ieee80211_local *local = sta->local;
 544        struct ieee80211_if_ap *bss = sta->sdata->bss;
 545        unsigned long flags;
 546        bool indicate_tim = false;
 547        u8 ignore_for_tim = sta->sta.uapsd_queues;
 548        int ac;
 549
 550        if (WARN_ON_ONCE(!sta->sdata->bss))
 551                return;
 552
 553        /* No need to do anything if the driver does all */
 554        if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
 555                return;
 556
 557        if (sta->dead)
 558                goto done;
 559
 560        /*
 561         * If all ACs are delivery-enabled then we should build
 562         * the TIM bit for all ACs anyway; if only some are then
 563         * we ignore those and build the TIM bit using only the
 564         * non-enabled ones.
 565         */
 566        if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
 567                ignore_for_tim = 0;
 568
 569        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 570                unsigned long tids;
 571
 572                if (ignore_for_tim & BIT(ac))
 573                        continue;
 574
 575                indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
 576                                !skb_queue_empty(&sta->ps_tx_buf[ac]);
 577                if (indicate_tim)
 578                        break;
 579
 580                tids = ieee80211_tids_for_ac(ac);
 581
 582                indicate_tim |=
 583                        sta->driver_buffered_tids & tids;
 584        }
 585
 586 done:
 587        spin_lock_irqsave(&local->tim_lock, flags);
 588
 589        if (indicate_tim)
 590                __bss_tim_set(bss, sta->sta.aid);
 591        else
 592                __bss_tim_clear(bss, sta->sta.aid);
 593
 594        if (local->ops->set_tim) {
 595                local->tim_in_locked_section = true;
 596                drv_set_tim(local, &sta->sta, indicate_tim);
 597                local->tim_in_locked_section = false;
 598        }
 599
 600        spin_unlock_irqrestore(&local->tim_lock, flags);
 601}
 602
 603static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
 604{
 605        struct ieee80211_tx_info *info;
 606        int timeout;
 607
 608        if (!skb)
 609                return false;
 610
 611        info = IEEE80211_SKB_CB(skb);
 612
 613        /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
 614        timeout = (sta->listen_interval *
 615                   sta->sdata->vif.bss_conf.beacon_int *
 616                   32 / 15625) * HZ;
 617        if (timeout < STA_TX_BUFFER_EXPIRE)
 618                timeout = STA_TX_BUFFER_EXPIRE;
 619        return time_after(jiffies, info->control.jiffies + timeout);
 620}
 621
 622
 623static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
 624                                                struct sta_info *sta, int ac)
 625{
 626        unsigned long flags;
 627        struct sk_buff *skb;
 628
 629        /*
 630         * First check for frames that should expire on the filtered
 631         * queue. Frames here were rejected by the driver and are on
 632         * a separate queue to avoid reordering with normal PS-buffered
 633         * frames. They also aren't accounted for right now in the
 634         * total_ps_buffered counter.
 635         */
 636        for (;;) {
 637                spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
 638                skb = skb_peek(&sta->tx_filtered[ac]);
 639                if (sta_info_buffer_expired(sta, skb))
 640                        skb = __skb_dequeue(&sta->tx_filtered[ac]);
 641                else
 642                        skb = NULL;
 643                spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
 644
 645                /*
 646                 * Frames are queued in order, so if this one
 647                 * hasn't expired yet we can stop testing. If
 648                 * we actually reached the end of the queue we
 649                 * also need to stop, of course.
 650                 */
 651                if (!skb)
 652                        break;
 653                ieee80211_free_txskb(&local->hw, skb);
 654        }
 655
 656        /*
 657         * Now also check the normal PS-buffered queue, this will
 658         * only find something if the filtered queue was emptied
 659         * since the filtered frames are all before the normal PS
 660         * buffered frames.
 661         */
 662        for (;;) {
 663                spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
 664                skb = skb_peek(&sta->ps_tx_buf[ac]);
 665                if (sta_info_buffer_expired(sta, skb))
 666                        skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
 667                else
 668                        skb = NULL;
 669                spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
 670
 671                /*
 672                 * frames are queued in order, so if this one
 673                 * hasn't expired yet (or we reached the end of
 674                 * the queue) we can stop testing
 675                 */
 676                if (!skb)
 677                        break;
 678
 679                local->total_ps_buffered--;
 680                ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
 681                       sta->sta.addr);
 682                ieee80211_free_txskb(&local->hw, skb);
 683        }
 684
 685        /*
 686         * Finally, recalculate the TIM bit for this station -- it might
 687         * now be clear because the station was too slow to retrieve its
 688         * frames.
 689         */
 690        sta_info_recalc_tim(sta);
 691
 692        /*
 693         * Return whether there are any frames still buffered, this is
 694         * used to check whether the cleanup timer still needs to run,
 695         * if there are no frames we don't need to rearm the timer.
 696         */
 697        return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
 698                 skb_queue_empty(&sta->tx_filtered[ac]));
 699}
 700
 701static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
 702                                             struct sta_info *sta)
 703{
 704        bool have_buffered = false;
 705        int ac;
 706
 707        /* This is only necessary for stations on BSS interfaces */
 708        if (!sta->sdata->bss)
 709                return false;
 710
 711        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 712                have_buffered |=
 713                        sta_info_cleanup_expire_buffered_ac(local, sta, ac);
 714
 715        return have_buffered;
 716}
 717
 718int __must_check __sta_info_destroy(struct sta_info *sta)
 719{
 720        struct ieee80211_local *local;
 721        struct ieee80211_sub_if_data *sdata;
 722        int ret, i;
 723
 724        might_sleep();
 725
 726        if (!sta)
 727                return -ENOENT;
 728
 729        local = sta->local;
 730        sdata = sta->sdata;
 731
 732        lockdep_assert_held(&local->sta_mtx);
 733
 734        /*
 735         * Before removing the station from the driver and
 736         * rate control, it might still start new aggregation
 737         * sessions -- block that to make sure the tear-down
 738         * will be sufficient.
 739         */
 740        set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 741        ieee80211_sta_tear_down_BA_sessions(sta, false);
 742
 743        ret = sta_info_hash_del(local, sta);
 744        if (ret)
 745                return ret;
 746
 747        list_del_rcu(&sta->list);
 748
 749        mutex_lock(&local->key_mtx);
 750        for (i = 0; i < NUM_DEFAULT_KEYS; i++)
 751                __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
 752        if (sta->ptk)
 753                __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
 754        mutex_unlock(&local->key_mtx);
 755
 756        sta->dead = true;
 757
 758        local->num_sta--;
 759        local->sta_generation++;
 760
 761        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 762                RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
 763
 764        while (sta->sta_state > IEEE80211_STA_NONE) {
 765                ret = sta_info_move_state(sta, sta->sta_state - 1);
 766                if (ret) {
 767                        WARN_ON_ONCE(1);
 768                        break;
 769                }
 770        }
 771
 772        if (sta->uploaded) {
 773                ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
 774                                    IEEE80211_STA_NOTEXIST);
 775                WARN_ON_ONCE(ret != 0);
 776        }
 777
 778        sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
 779
 780        cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
 781
 782        rate_control_remove_sta_debugfs(sta);
 783        ieee80211_sta_debugfs_remove(sta);
 784
 785        call_rcu(&sta->rcu_head, free_sta_rcu);
 786
 787        return 0;
 788}
 789
 790int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
 791{
 792        struct sta_info *sta;
 793        int ret;
 794
 795        mutex_lock(&sdata->local->sta_mtx);
 796        sta = sta_info_get(sdata, addr);
 797        ret = __sta_info_destroy(sta);
 798        mutex_unlock(&sdata->local->sta_mtx);
 799
 800        return ret;
 801}
 802
 803int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
 804                              const u8 *addr)
 805{
 806        struct sta_info *sta;
 807        int ret;
 808
 809        mutex_lock(&sdata->local->sta_mtx);
 810        sta = sta_info_get_bss(sdata, addr);
 811        ret = __sta_info_destroy(sta);
 812        mutex_unlock(&sdata->local->sta_mtx);
 813
 814        return ret;
 815}
 816
 817static void sta_info_cleanup(unsigned long data)
 818{
 819        struct ieee80211_local *local = (struct ieee80211_local *) data;
 820        struct sta_info *sta;
 821        bool timer_needed = false;
 822
 823        rcu_read_lock();
 824        list_for_each_entry_rcu(sta, &local->sta_list, list)
 825                if (sta_info_cleanup_expire_buffered(local, sta))
 826                        timer_needed = true;
 827        rcu_read_unlock();
 828
 829        if (local->quiescing)
 830                return;
 831
 832        if (!timer_needed)
 833                return;
 834
 835        mod_timer(&local->sta_cleanup,
 836                  round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
 837}
 838
 839void sta_info_init(struct ieee80211_local *local)
 840{
 841        spin_lock_init(&local->tim_lock);
 842        mutex_init(&local->sta_mtx);
 843        INIT_LIST_HEAD(&local->sta_list);
 844
 845        setup_timer(&local->sta_cleanup, sta_info_cleanup,
 846                    (unsigned long)local);
 847}
 848
 849void sta_info_stop(struct ieee80211_local *local)
 850{
 851        del_timer(&local->sta_cleanup);
 852        sta_info_flush(local, NULL);
 853}
 854
 855/**
 856 * sta_info_flush - flush matching STA entries from the STA table
 857 *
 858 * Returns the number of removed STA entries.
 859 *
 860 * @local: local interface data
 861 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
 862 */
 863int sta_info_flush(struct ieee80211_local *local,
 864                   struct ieee80211_sub_if_data *sdata)
 865{
 866        struct sta_info *sta, *tmp;
 867        int ret = 0;
 868
 869        might_sleep();
 870
 871        mutex_lock(&local->sta_mtx);
 872        list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
 873                if (!sdata || sdata == sta->sdata) {
 874                        WARN_ON(__sta_info_destroy(sta));
 875                        ret++;
 876                }
 877        }
 878        mutex_unlock(&local->sta_mtx);
 879
 880        return ret;
 881}
 882
 883void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
 884                          unsigned long exp_time)
 885{
 886        struct ieee80211_local *local = sdata->local;
 887        struct sta_info *sta, *tmp;
 888
 889        mutex_lock(&local->sta_mtx);
 890
 891        list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
 892                if (sdata != sta->sdata)
 893                        continue;
 894
 895                if (time_after(jiffies, sta->last_rx + exp_time)) {
 896                        ibss_dbg(sdata, "expiring inactive STA %pM\n",
 897                                 sta->sta.addr);
 898                        WARN_ON(__sta_info_destroy(sta));
 899                }
 900        }
 901
 902        mutex_unlock(&local->sta_mtx);
 903}
 904
 905struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
 906                                               const u8 *addr,
 907                                               const u8 *localaddr)
 908{
 909        struct sta_info *sta, *nxt;
 910
 911        /*
 912         * Just return a random station if localaddr is NULL
 913         * ... first in list.
 914         */
 915        for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
 916                if (localaddr &&
 917                    !ether_addr_equal(sta->sdata->vif.addr, localaddr))
 918                        continue;
 919                if (!sta->uploaded)
 920                        return NULL;
 921                return &sta->sta;
 922        }
 923
 924        return NULL;
 925}
 926EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
 927
 928struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
 929                                         const u8 *addr)
 930{
 931        struct sta_info *sta;
 932
 933        if (!vif)
 934                return NULL;
 935
 936        sta = sta_info_get_bss(vif_to_sdata(vif), addr);
 937        if (!sta)
 938                return NULL;
 939
 940        if (!sta->uploaded)
 941                return NULL;
 942
 943        return &sta->sta;
 944}
 945EXPORT_SYMBOL(ieee80211_find_sta);
 946
 947static void clear_sta_ps_flags(void *_sta)
 948{
 949        struct sta_info *sta = _sta;
 950        struct ieee80211_sub_if_data *sdata = sta->sdata;
 951
 952        clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
 953        if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
 954                atomic_dec(&sdata->bss->num_sta_ps);
 955}
 956
 957/* powersave support code */
 958void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
 959{
 960        struct ieee80211_sub_if_data *sdata = sta->sdata;
 961        struct ieee80211_local *local = sdata->local;
 962        struct sk_buff_head pending;
 963        int filtered = 0, buffered = 0, ac;
 964        unsigned long flags;
 965
 966        clear_sta_flag(sta, WLAN_STA_SP);
 967
 968        BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1);
 969        sta->driver_buffered_tids = 0;
 970
 971        if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
 972                drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
 973
 974        skb_queue_head_init(&pending);
 975
 976        /* Send all buffered frames to the station */
 977        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 978                int count = skb_queue_len(&pending), tmp;
 979
 980                spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
 981                skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
 982                spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
 983                tmp = skb_queue_len(&pending);
 984                filtered += tmp - count;
 985                count = tmp;
 986
 987                spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
 988                skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
 989                spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
 990                tmp = skb_queue_len(&pending);
 991                buffered += tmp - count;
 992        }
 993
 994        ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
 995
 996        local->total_ps_buffered -= buffered;
 997
 998        sta_info_recalc_tim(sta);
 999
1000        ps_dbg(sdata,
1001               "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1002               sta->sta.addr, sta->sta.aid, filtered, buffered);
1003}
1004
1005static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1006                                         struct sta_info *sta, int tid,
1007                                         enum ieee80211_frame_release_type reason)
1008{
1009        struct ieee80211_local *local = sdata->local;
1010        struct ieee80211_qos_hdr *nullfunc;
1011        struct sk_buff *skb;
1012        int size = sizeof(*nullfunc);
1013        __le16 fc;
1014        bool qos = test_sta_flag(sta, WLAN_STA_WME);
1015        struct ieee80211_tx_info *info;
1016
1017        if (qos) {
1018                fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1019                                 IEEE80211_STYPE_QOS_NULLFUNC |
1020                                 IEEE80211_FCTL_FROMDS);
1021        } else {
1022                size -= 2;
1023                fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1024                                 IEEE80211_STYPE_NULLFUNC |
1025                                 IEEE80211_FCTL_FROMDS);
1026        }
1027
1028        skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1029        if (!skb)
1030                return;
1031
1032        skb_reserve(skb, local->hw.extra_tx_headroom);
1033
1034        nullfunc = (void *) skb_put(skb, size);
1035        nullfunc->frame_control = fc;
1036        nullfunc->duration_id = 0;
1037        memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1038        memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1039        memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1040
1041        skb->priority = tid;
1042        skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1043        if (qos) {
1044                nullfunc->qos_ctrl = cpu_to_le16(tid);
1045
1046                if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1047                        nullfunc->qos_ctrl |=
1048                                cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1049        }
1050
1051        info = IEEE80211_SKB_CB(skb);
1052
1053        /*
1054         * Tell TX path to send this frame even though the
1055         * STA may still remain is PS mode after this frame
1056         * exchange. Also set EOSP to indicate this packet
1057         * ends the poll/service period.
1058         */
1059        info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1060                       IEEE80211_TX_STATUS_EOSP |
1061                       IEEE80211_TX_CTL_REQ_TX_STATUS;
1062
1063        drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1064
1065        ieee80211_xmit(sdata, skb);
1066}
1067
1068static void
1069ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1070                                  int n_frames, u8 ignored_acs,
1071                                  enum ieee80211_frame_release_type reason)
1072{
1073        struct ieee80211_sub_if_data *sdata = sta->sdata;
1074        struct ieee80211_local *local = sdata->local;
1075        bool found = false;
1076        bool more_data = false;
1077        int ac;
1078        unsigned long driver_release_tids = 0;
1079        struct sk_buff_head frames;
1080
1081        /* Service or PS-Poll period starts */
1082        set_sta_flag(sta, WLAN_STA_SP);
1083
1084        __skb_queue_head_init(&frames);
1085
1086        /*
1087         * Get response frame(s) and more data bit for it.
1088         */
1089        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1090                unsigned long tids;
1091
1092                if (ignored_acs & BIT(ac))
1093                        continue;
1094
1095                tids = ieee80211_tids_for_ac(ac);
1096
1097                if (!found) {
1098                        driver_release_tids = sta->driver_buffered_tids & tids;
1099                        if (driver_release_tids) {
1100                                found = true;
1101                        } else {
1102                                struct sk_buff *skb;
1103
1104                                while (n_frames > 0) {
1105                                        skb = skb_dequeue(&sta->tx_filtered[ac]);
1106                                        if (!skb) {
1107                                                skb = skb_dequeue(
1108                                                        &sta->ps_tx_buf[ac]);
1109                                                if (skb)
1110                                                        local->total_ps_buffered--;
1111                                        }
1112                                        if (!skb)
1113                                                break;
1114                                        n_frames--;
1115                                        found = true;
1116                                        __skb_queue_tail(&frames, skb);
1117                                }
1118                        }
1119
1120                        /*
1121                         * If the driver has data on more than one TID then
1122                         * certainly there's more data if we release just a
1123                         * single frame now (from a single TID).
1124                         */
1125                        if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1126                            hweight16(driver_release_tids) > 1) {
1127                                more_data = true;
1128                                driver_release_tids =
1129                                        BIT(ffs(driver_release_tids) - 1);
1130                                break;
1131                        }
1132                }
1133
1134                if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1135                    !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1136                        more_data = true;
1137                        break;
1138                }
1139        }
1140
1141        if (!found) {
1142                int tid;
1143
1144                /*
1145                 * For PS-Poll, this can only happen due to a race condition
1146                 * when we set the TIM bit and the station notices it, but
1147                 * before it can poll for the frame we expire it.
1148                 *
1149                 * For uAPSD, this is said in the standard (11.2.1.5 h):
1150                 *      At each unscheduled SP for a non-AP STA, the AP shall
1151                 *      attempt to transmit at least one MSDU or MMPDU, but no
1152                 *      more than the value specified in the Max SP Length field
1153                 *      in the QoS Capability element from delivery-enabled ACs,
1154                 *      that are destined for the non-AP STA.
1155                 *
1156                 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1157                 */
1158
1159                /* This will evaluate to 1, 3, 5 or 7. */
1160                tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1161
1162                ieee80211_send_null_response(sdata, sta, tid, reason);
1163                return;
1164        }
1165
1166        if (!driver_release_tids) {
1167                struct sk_buff_head pending;
1168                struct sk_buff *skb;
1169                int num = 0;
1170                u16 tids = 0;
1171
1172                skb_queue_head_init(&pending);
1173
1174                while ((skb = __skb_dequeue(&frames))) {
1175                        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1176                        struct ieee80211_hdr *hdr = (void *) skb->data;
1177                        u8 *qoshdr = NULL;
1178
1179                        num++;
1180
1181                        /*
1182                         * Tell TX path to send this frame even though the
1183                         * STA may still remain is PS mode after this frame
1184                         * exchange.
1185                         */
1186                        info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1187
1188                        /*
1189                         * Use MoreData flag to indicate whether there are
1190                         * more buffered frames for this STA
1191                         */
1192                        if (more_data || !skb_queue_empty(&frames))
1193                                hdr->frame_control |=
1194                                        cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1195                        else
1196                                hdr->frame_control &=
1197                                        cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1198
1199                        if (ieee80211_is_data_qos(hdr->frame_control) ||
1200                            ieee80211_is_qos_nullfunc(hdr->frame_control))
1201                                qoshdr = ieee80211_get_qos_ctl(hdr);
1202
1203                        /* end service period after last frame */
1204                        if (skb_queue_empty(&frames)) {
1205                                if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1206                                    qoshdr)
1207                                        *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1208
1209                                info->flags |= IEEE80211_TX_STATUS_EOSP |
1210                                               IEEE80211_TX_CTL_REQ_TX_STATUS;
1211                        }
1212
1213                        if (qoshdr)
1214                                tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1215                        else
1216                                tids |= BIT(0);
1217
1218                        __skb_queue_tail(&pending, skb);
1219                }
1220
1221                drv_allow_buffered_frames(local, sta, tids, num,
1222                                          reason, more_data);
1223
1224                ieee80211_add_pending_skbs(local, &pending);
1225
1226                sta_info_recalc_tim(sta);
1227        } else {
1228                /*
1229                 * We need to release a frame that is buffered somewhere in the
1230                 * driver ... it'll have to handle that.
1231                 * Note that, as per the comment above, it'll also have to see
1232                 * if there is more than just one frame on the specific TID that
1233                 * we're releasing from, and it needs to set the more-data bit
1234                 * accordingly if we tell it that there's no more data. If we do
1235                 * tell it there's more data, then of course the more-data bit
1236                 * needs to be set anyway.
1237                 */
1238                drv_release_buffered_frames(local, sta, driver_release_tids,
1239                                            n_frames, reason, more_data);
1240
1241                /*
1242                 * Note that we don't recalculate the TIM bit here as it would
1243                 * most likely have no effect at all unless the driver told us
1244                 * that the TID became empty before returning here from the
1245                 * release function.
1246                 * Either way, however, when the driver tells us that the TID
1247                 * became empty we'll do the TIM recalculation.
1248                 */
1249        }
1250}
1251
1252void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1253{
1254        u8 ignore_for_response = sta->sta.uapsd_queues;
1255
1256        /*
1257         * If all ACs are delivery-enabled then we should reply
1258         * from any of them, if only some are enabled we reply
1259         * only from the non-enabled ones.
1260         */
1261        if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1262                ignore_for_response = 0;
1263
1264        ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1265                                          IEEE80211_FRAME_RELEASE_PSPOLL);
1266}
1267
1268void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1269{
1270        int n_frames = sta->sta.max_sp;
1271        u8 delivery_enabled = sta->sta.uapsd_queues;
1272
1273        /*
1274         * If we ever grow support for TSPEC this might happen if
1275         * the TSPEC update from hostapd comes in between a trigger
1276         * frame setting WLAN_STA_UAPSD in the RX path and this
1277         * actually getting called.
1278         */
1279        if (!delivery_enabled)
1280                return;
1281
1282        switch (sta->sta.max_sp) {
1283        case 1:
1284                n_frames = 2;
1285                break;
1286        case 2:
1287                n_frames = 4;
1288                break;
1289        case 3:
1290                n_frames = 6;
1291                break;
1292        case 0:
1293                /* XXX: what is a good value? */
1294                n_frames = 8;
1295                break;
1296        }
1297
1298        ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1299                                          IEEE80211_FRAME_RELEASE_UAPSD);
1300}
1301
1302void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1303                               struct ieee80211_sta *pubsta, bool block)
1304{
1305        struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1306
1307        trace_api_sta_block_awake(sta->local, pubsta, block);
1308
1309        if (block)
1310                set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1311        else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1312                ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1313}
1314EXPORT_SYMBOL(ieee80211_sta_block_awake);
1315
1316void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
1317{
1318        struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1319        struct ieee80211_local *local = sta->local;
1320        struct sk_buff *skb;
1321        struct skb_eosp_msg_data *data;
1322
1323        trace_api_eosp(local, pubsta);
1324
1325        skb = alloc_skb(0, GFP_ATOMIC);
1326        if (!skb) {
1327                /* too bad ... but race is better than loss */
1328                clear_sta_flag(sta, WLAN_STA_SP);
1329                return;
1330        }
1331
1332        data = (void *)skb->cb;
1333        memcpy(data->sta, pubsta->addr, ETH_ALEN);
1334        memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
1335        skb->pkt_type = IEEE80211_EOSP_MSG;
1336        skb_queue_tail(&local->skb_queue, skb);
1337        tasklet_schedule(&local->tasklet);
1338}
1339EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
1340
1341void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1342                                u8 tid, bool buffered)
1343{
1344        struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1345
1346        if (WARN_ON(tid >= STA_TID_NUM))
1347                return;
1348
1349        if (buffered)
1350                set_bit(tid, &sta->driver_buffered_tids);
1351        else
1352                clear_bit(tid, &sta->driver_buffered_tids);
1353
1354        sta_info_recalc_tim(sta);
1355}
1356EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1357
1358int sta_info_move_state(struct sta_info *sta,
1359                        enum ieee80211_sta_state new_state)
1360{
1361        might_sleep();
1362
1363        if (sta->sta_state == new_state)
1364                return 0;
1365
1366        /* check allowed transitions first */
1367
1368        switch (new_state) {
1369        case IEEE80211_STA_NONE:
1370                if (sta->sta_state != IEEE80211_STA_AUTH)
1371                        return -EINVAL;
1372                break;
1373        case IEEE80211_STA_AUTH:
1374                if (sta->sta_state != IEEE80211_STA_NONE &&
1375                    sta->sta_state != IEEE80211_STA_ASSOC)
1376                        return -EINVAL;
1377                break;
1378        case IEEE80211_STA_ASSOC:
1379                if (sta->sta_state != IEEE80211_STA_AUTH &&
1380                    sta->sta_state != IEEE80211_STA_AUTHORIZED)
1381                        return -EINVAL;
1382                break;
1383        case IEEE80211_STA_AUTHORIZED:
1384                if (sta->sta_state != IEEE80211_STA_ASSOC)
1385                        return -EINVAL;
1386                break;
1387        default:
1388                WARN(1, "invalid state %d", new_state);
1389                return -EINVAL;
1390        }
1391
1392        sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1393                sta->sta.addr, new_state);
1394
1395        /*
1396         * notify the driver before the actual changes so it can
1397         * fail the transition
1398         */
1399        if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1400                int err = drv_sta_state(sta->local, sta->sdata, sta,
1401                                        sta->sta_state, new_state);
1402                if (err)
1403                        return err;
1404        }
1405
1406        /* reflect the change in all state variables */
1407
1408        switch (new_state) {
1409        case IEEE80211_STA_NONE:
1410                if (sta->sta_state == IEEE80211_STA_AUTH)
1411                        clear_bit(WLAN_STA_AUTH, &sta->_flags);
1412                break;
1413        case IEEE80211_STA_AUTH:
1414                if (sta->sta_state == IEEE80211_STA_NONE)
1415                        set_bit(WLAN_STA_AUTH, &sta->_flags);
1416                else if (sta->sta_state == IEEE80211_STA_ASSOC)
1417                        clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1418                break;
1419        case IEEE80211_STA_ASSOC:
1420                if (sta->sta_state == IEEE80211_STA_AUTH) {
1421                        set_bit(WLAN_STA_ASSOC, &sta->_flags);
1422                } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1423                        if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1424                            (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1425                             !sta->sdata->u.vlan.sta))
1426                                atomic_dec(&sta->sdata->bss->num_mcast_sta);
1427                        clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1428                }
1429                break;
1430        case IEEE80211_STA_AUTHORIZED:
1431                if (sta->sta_state == IEEE80211_STA_ASSOC) {
1432                        if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1433                            (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1434                             !sta->sdata->u.vlan.sta))
1435                                atomic_inc(&sta->sdata->bss->num_mcast_sta);
1436                        set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1437                }
1438                break;
1439        default:
1440                break;
1441        }
1442
1443        sta->sta_state = new_state;
1444
1445        return 0;
1446}
1447
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.