linux/net/mac80211/util.c
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   1/*
   2 * Copyright 2002-2005, Instant802 Networks, Inc.
   3 * Copyright 2005-2006, Devicescape Software, Inc.
   4 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5 * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 *
  11 * utilities for mac80211
  12 */
  13
  14#include <net/mac80211.h>
  15#include <linux/netdevice.h>
  16#include <linux/export.h>
  17#include <linux/types.h>
  18#include <linux/slab.h>
  19#include <linux/skbuff.h>
  20#include <linux/etherdevice.h>
  21#include <linux/if_arp.h>
  22#include <linux/bitmap.h>
  23#include <linux/crc32.h>
  24#include <net/net_namespace.h>
  25#include <net/cfg80211.h>
  26#include <net/rtnetlink.h>
  27
  28#include "ieee80211_i.h"
  29#include "driver-ops.h"
  30#include "rate.h"
  31#include "mesh.h"
  32#include "wme.h"
  33#include "led.h"
  34#include "wep.h"
  35
  36/* privid for wiphys to determine whether they belong to us or not */
  37void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  38
  39struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  40{
  41        struct ieee80211_local *local;
  42        BUG_ON(!wiphy);
  43
  44        local = wiphy_priv(wiphy);
  45        return &local->hw;
  46}
  47EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  48
  49u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  50                        enum nl80211_iftype type)
  51{
  52        __le16 fc = hdr->frame_control;
  53
  54         /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  55        if (len < 16)
  56                return NULL;
  57
  58        if (ieee80211_is_data(fc)) {
  59                if (len < 24) /* drop incorrect hdr len (data) */
  60                        return NULL;
  61
  62                if (ieee80211_has_a4(fc))
  63                        return NULL;
  64                if (ieee80211_has_tods(fc))
  65                        return hdr->addr1;
  66                if (ieee80211_has_fromds(fc))
  67                        return hdr->addr2;
  68
  69                return hdr->addr3;
  70        }
  71
  72        if (ieee80211_is_mgmt(fc)) {
  73                if (len < 24) /* drop incorrect hdr len (mgmt) */
  74                        return NULL;
  75                return hdr->addr3;
  76        }
  77
  78        if (ieee80211_is_ctl(fc)) {
  79                if(ieee80211_is_pspoll(fc))
  80                        return hdr->addr1;
  81
  82                if (ieee80211_is_back_req(fc)) {
  83                        switch (type) {
  84                        case NL80211_IFTYPE_STATION:
  85                                return hdr->addr2;
  86                        case NL80211_IFTYPE_AP:
  87                        case NL80211_IFTYPE_AP_VLAN:
  88                                return hdr->addr1;
  89                        default:
  90                                break; /* fall through to the return */
  91                        }
  92                }
  93        }
  94
  95        return NULL;
  96}
  97
  98void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  99{
 100        struct sk_buff *skb;
 101        struct ieee80211_hdr *hdr;
 102
 103        skb_queue_walk(&tx->skbs, skb) {
 104                hdr = (struct ieee80211_hdr *) skb->data;
 105                hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 106        }
 107}
 108
 109int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
 110                             int rate, int erp, int short_preamble)
 111{
 112        int dur;
 113
 114        /* calculate duration (in microseconds, rounded up to next higher
 115         * integer if it includes a fractional microsecond) to send frame of
 116         * len bytes (does not include FCS) at the given rate. Duration will
 117         * also include SIFS.
 118         *
 119         * rate is in 100 kbps, so divident is multiplied by 10 in the
 120         * DIV_ROUND_UP() operations.
 121         */
 122
 123        if (band == IEEE80211_BAND_5GHZ || erp) {
 124                /*
 125                 * OFDM:
 126                 *
 127                 * N_DBPS = DATARATE x 4
 128                 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 129                 *      (16 = SIGNAL time, 6 = tail bits)
 130                 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 131                 *
 132                 * T_SYM = 4 usec
 133                 * 802.11a - 17.5.2: aSIFSTime = 16 usec
 134                 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 135                 *      signal ext = 6 usec
 136                 */
 137                dur = 16; /* SIFS + signal ext */
 138                dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 139                dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 140                dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 141                                        4 * rate); /* T_SYM x N_SYM */
 142        } else {
 143                /*
 144                 * 802.11b or 802.11g with 802.11b compatibility:
 145                 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 146                 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 147                 *
 148                 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 149                 * aSIFSTime = 10 usec
 150                 * aPreambleLength = 144 usec or 72 usec with short preamble
 151                 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 152                 */
 153                dur = 10; /* aSIFSTime = 10 usec */
 154                dur += short_preamble ? (72 + 24) : (144 + 48);
 155
 156                dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 157        }
 158
 159        return dur;
 160}
 161
 162/* Exported duration function for driver use */
 163__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 164                                        struct ieee80211_vif *vif,
 165                                        enum ieee80211_band band,
 166                                        size_t frame_len,
 167                                        struct ieee80211_rate *rate)
 168{
 169        struct ieee80211_sub_if_data *sdata;
 170        u16 dur;
 171        int erp;
 172        bool short_preamble = false;
 173
 174        erp = 0;
 175        if (vif) {
 176                sdata = vif_to_sdata(vif);
 177                short_preamble = sdata->vif.bss_conf.use_short_preamble;
 178                if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 179                        erp = rate->flags & IEEE80211_RATE_ERP_G;
 180        }
 181
 182        dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 183                                       short_preamble);
 184
 185        return cpu_to_le16(dur);
 186}
 187EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 188
 189__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 190                              struct ieee80211_vif *vif, size_t frame_len,
 191                              const struct ieee80211_tx_info *frame_txctl)
 192{
 193        struct ieee80211_local *local = hw_to_local(hw);
 194        struct ieee80211_rate *rate;
 195        struct ieee80211_sub_if_data *sdata;
 196        bool short_preamble;
 197        int erp;
 198        u16 dur;
 199        struct ieee80211_supported_band *sband;
 200
 201        sband = local->hw.wiphy->bands[frame_txctl->band];
 202
 203        short_preamble = false;
 204
 205        rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 206
 207        erp = 0;
 208        if (vif) {
 209                sdata = vif_to_sdata(vif);
 210                short_preamble = sdata->vif.bss_conf.use_short_preamble;
 211                if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 212                        erp = rate->flags & IEEE80211_RATE_ERP_G;
 213        }
 214
 215        /* CTS duration */
 216        dur = ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 217                                       erp, short_preamble);
 218        /* Data frame duration */
 219        dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
 220                                        erp, short_preamble);
 221        /* ACK duration */
 222        dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 223                                        erp, short_preamble);
 224
 225        return cpu_to_le16(dur);
 226}
 227EXPORT_SYMBOL(ieee80211_rts_duration);
 228
 229__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 230                                    struct ieee80211_vif *vif,
 231                                    size_t frame_len,
 232                                    const struct ieee80211_tx_info *frame_txctl)
 233{
 234        struct ieee80211_local *local = hw_to_local(hw);
 235        struct ieee80211_rate *rate;
 236        struct ieee80211_sub_if_data *sdata;
 237        bool short_preamble;
 238        int erp;
 239        u16 dur;
 240        struct ieee80211_supported_band *sband;
 241
 242        sband = local->hw.wiphy->bands[frame_txctl->band];
 243
 244        short_preamble = false;
 245
 246        rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 247        erp = 0;
 248        if (vif) {
 249                sdata = vif_to_sdata(vif);
 250                short_preamble = sdata->vif.bss_conf.use_short_preamble;
 251                if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 252                        erp = rate->flags & IEEE80211_RATE_ERP_G;
 253        }
 254
 255        /* Data frame duration */
 256        dur = ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
 257                                       erp, short_preamble);
 258        if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 259                /* ACK duration */
 260                dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 261                                                erp, short_preamble);
 262        }
 263
 264        return cpu_to_le16(dur);
 265}
 266EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 269{
 270        struct ieee80211_sub_if_data *sdata;
 271        int n_acs = IEEE80211_NUM_ACS;
 272
 273        if (local->hw.queues < IEEE80211_NUM_ACS)
 274                n_acs = 1;
 275
 276        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 277                int ac;
 278
 279                if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 280                        continue;
 281
 282                if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 283                    local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 284                        continue;
 285
 286                for (ac = 0; ac < n_acs; ac++) {
 287                        int ac_queue = sdata->vif.hw_queue[ac];
 288
 289                        if (ac_queue == queue ||
 290                            (sdata->vif.cab_queue == queue &&
 291                             local->queue_stop_reasons[ac_queue] == 0 &&
 292                             skb_queue_empty(&local->pending[ac_queue])))
 293                                netif_wake_subqueue(sdata->dev, ac);
 294                }
 295        }
 296}
 297
 298static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 299                                   enum queue_stop_reason reason)
 300{
 301        struct ieee80211_local *local = hw_to_local(hw);
 302
 303        trace_wake_queue(local, queue, reason);
 304
 305        if (WARN_ON(queue >= hw->queues))
 306                return;
 307
 308        if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 309                return;
 310
 311        __clear_bit(reason, &local->queue_stop_reasons[queue]);
 312
 313        if (local->queue_stop_reasons[queue] != 0)
 314                /* someone still has this queue stopped */
 315                return;
 316
 317        if (skb_queue_empty(&local->pending[queue])) {
 318                rcu_read_lock();
 319                ieee80211_propagate_queue_wake(local, queue);
 320                rcu_read_unlock();
 321        } else
 322                tasklet_schedule(&local->tx_pending_tasklet);
 323}
 324
 325void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 326                                    enum queue_stop_reason reason)
 327{
 328        struct ieee80211_local *local = hw_to_local(hw);
 329        unsigned long flags;
 330
 331        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 332        __ieee80211_wake_queue(hw, queue, reason);
 333        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 334}
 335
 336void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 337{
 338        ieee80211_wake_queue_by_reason(hw, queue,
 339                                       IEEE80211_QUEUE_STOP_REASON_DRIVER);
 340}
 341EXPORT_SYMBOL(ieee80211_wake_queue);
 342
 343static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 344                                   enum queue_stop_reason reason)
 345{
 346        struct ieee80211_local *local = hw_to_local(hw);
 347        struct ieee80211_sub_if_data *sdata;
 348        int n_acs = IEEE80211_NUM_ACS;
 349
 350        trace_stop_queue(local, queue, reason);
 351
 352        if (WARN_ON(queue >= hw->queues))
 353                return;
 354
 355        if (test_bit(reason, &local->queue_stop_reasons[queue]))
 356                return;
 357
 358        __set_bit(reason, &local->queue_stop_reasons[queue]);
 359
 360        if (local->hw.queues < IEEE80211_NUM_ACS)
 361                n_acs = 1;
 362
 363        rcu_read_lock();
 364        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 365                int ac;
 366
 367                for (ac = 0; ac < n_acs; ac++) {
 368                        if (sdata->vif.hw_queue[ac] == queue ||
 369                            sdata->vif.cab_queue == queue)
 370                                netif_stop_subqueue(sdata->dev, ac);
 371                }
 372        }
 373        rcu_read_unlock();
 374}
 375
 376void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 377                                    enum queue_stop_reason reason)
 378{
 379        struct ieee80211_local *local = hw_to_local(hw);
 380        unsigned long flags;
 381
 382        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 383        __ieee80211_stop_queue(hw, queue, reason);
 384        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 385}
 386
 387void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 388{
 389        ieee80211_stop_queue_by_reason(hw, queue,
 390                                       IEEE80211_QUEUE_STOP_REASON_DRIVER);
 391}
 392EXPORT_SYMBOL(ieee80211_stop_queue);
 393
 394void ieee80211_add_pending_skb(struct ieee80211_local *local,
 395                               struct sk_buff *skb)
 396{
 397        struct ieee80211_hw *hw = &local->hw;
 398        unsigned long flags;
 399        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 400        int queue = info->hw_queue;
 401
 402        if (WARN_ON(!info->control.vif)) {
 403                ieee80211_free_txskb(&local->hw, skb);
 404                return;
 405        }
 406
 407        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 408        __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 409        __skb_queue_tail(&local->pending[queue], skb);
 410        __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 411        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 412}
 413
 414void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 415                                   struct sk_buff_head *skbs,
 416                                   void (*fn)(void *data), void *data)
 417{
 418        struct ieee80211_hw *hw = &local->hw;
 419        struct sk_buff *skb;
 420        unsigned long flags;
 421        int queue, i;
 422
 423        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 424        while ((skb = skb_dequeue(skbs))) {
 425                struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 426
 427                if (WARN_ON(!info->control.vif)) {
 428                        ieee80211_free_txskb(&local->hw, skb);
 429                        continue;
 430                }
 431
 432                queue = info->hw_queue;
 433
 434                __ieee80211_stop_queue(hw, queue,
 435                                IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 436
 437                __skb_queue_tail(&local->pending[queue], skb);
 438        }
 439
 440        if (fn)
 441                fn(data);
 442
 443        for (i = 0; i < hw->queues; i++)
 444                __ieee80211_wake_queue(hw, i,
 445                        IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 446        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 447}
 448
 449void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 450                                    enum queue_stop_reason reason)
 451{
 452        struct ieee80211_local *local = hw_to_local(hw);
 453        unsigned long flags;
 454        int i;
 455
 456        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 457
 458        for (i = 0; i < hw->queues; i++)
 459                __ieee80211_stop_queue(hw, i, reason);
 460
 461        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 462}
 463
 464void ieee80211_stop_queues(struct ieee80211_hw *hw)
 465{
 466        ieee80211_stop_queues_by_reason(hw,
 467                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 468}
 469EXPORT_SYMBOL(ieee80211_stop_queues);
 470
 471int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 472{
 473        struct ieee80211_local *local = hw_to_local(hw);
 474        unsigned long flags;
 475        int ret;
 476
 477        if (WARN_ON(queue >= hw->queues))
 478                return true;
 479
 480        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 481        ret = !!local->queue_stop_reasons[queue];
 482        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 483        return ret;
 484}
 485EXPORT_SYMBOL(ieee80211_queue_stopped);
 486
 487void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 488                                     enum queue_stop_reason reason)
 489{
 490        struct ieee80211_local *local = hw_to_local(hw);
 491        unsigned long flags;
 492        int i;
 493
 494        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 495
 496        for (i = 0; i < hw->queues; i++)
 497                __ieee80211_wake_queue(hw, i, reason);
 498
 499        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 500}
 501
 502void ieee80211_wake_queues(struct ieee80211_hw *hw)
 503{
 504        ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 505}
 506EXPORT_SYMBOL(ieee80211_wake_queues);
 507
 508void ieee80211_iterate_active_interfaces(
 509        struct ieee80211_hw *hw,
 510        void (*iterator)(void *data, u8 *mac,
 511                         struct ieee80211_vif *vif),
 512        void *data)
 513{
 514        struct ieee80211_local *local = hw_to_local(hw);
 515        struct ieee80211_sub_if_data *sdata;
 516
 517        mutex_lock(&local->iflist_mtx);
 518
 519        list_for_each_entry(sdata, &local->interfaces, list) {
 520                switch (sdata->vif.type) {
 521                case NL80211_IFTYPE_MONITOR:
 522                case NL80211_IFTYPE_AP_VLAN:
 523                        continue;
 524                default:
 525                        break;
 526                }
 527                if (ieee80211_sdata_running(sdata))
 528                        iterator(data, sdata->vif.addr,
 529                                 &sdata->vif);
 530        }
 531
 532        sdata = rcu_dereference_protected(local->monitor_sdata,
 533                                          lockdep_is_held(&local->iflist_mtx));
 534        if (sdata)
 535                iterator(data, sdata->vif.addr, &sdata->vif);
 536
 537        mutex_unlock(&local->iflist_mtx);
 538}
 539EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 540
 541void ieee80211_iterate_active_interfaces_atomic(
 542        struct ieee80211_hw *hw,
 543        void (*iterator)(void *data, u8 *mac,
 544                         struct ieee80211_vif *vif),
 545        void *data)
 546{
 547        struct ieee80211_local *local = hw_to_local(hw);
 548        struct ieee80211_sub_if_data *sdata;
 549
 550        rcu_read_lock();
 551
 552        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 553                switch (sdata->vif.type) {
 554                case NL80211_IFTYPE_MONITOR:
 555                case NL80211_IFTYPE_AP_VLAN:
 556                        continue;
 557                default:
 558                        break;
 559                }
 560                if (ieee80211_sdata_running(sdata))
 561                        iterator(data, sdata->vif.addr,
 562                                 &sdata->vif);
 563        }
 564
 565        sdata = rcu_dereference(local->monitor_sdata);
 566        if (sdata)
 567                iterator(data, sdata->vif.addr, &sdata->vif);
 568
 569        rcu_read_unlock();
 570}
 571EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 572
 573/*
 574 * Nothing should have been stuffed into the workqueue during
 575 * the suspend->resume cycle. If this WARN is seen then there
 576 * is a bug with either the driver suspend or something in
 577 * mac80211 stuffing into the workqueue which we haven't yet
 578 * cleared during mac80211's suspend cycle.
 579 */
 580static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 581{
 582        if (WARN(local->suspended && !local->resuming,
 583                 "queueing ieee80211 work while going to suspend\n"))
 584                return false;
 585
 586        return true;
 587}
 588
 589void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 590{
 591        struct ieee80211_local *local = hw_to_local(hw);
 592
 593        if (!ieee80211_can_queue_work(local))
 594                return;
 595
 596        queue_work(local->workqueue, work);
 597}
 598EXPORT_SYMBOL(ieee80211_queue_work);
 599
 600void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 601                                  struct delayed_work *dwork,
 602                                  unsigned long delay)
 603{
 604        struct ieee80211_local *local = hw_to_local(hw);
 605
 606        if (!ieee80211_can_queue_work(local))
 607                return;
 608
 609        queue_delayed_work(local->workqueue, dwork, delay);
 610}
 611EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 612
 613u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 614                               struct ieee802_11_elems *elems,
 615                               u64 filter, u32 crc)
 616{
 617        size_t left = len;
 618        u8 *pos = start;
 619        bool calc_crc = filter != 0;
 620        DECLARE_BITMAP(seen_elems, 256);
 621
 622        bitmap_zero(seen_elems, 256);
 623        memset(elems, 0, sizeof(*elems));
 624        elems->ie_start = start;
 625        elems->total_len = len;
 626
 627        while (left >= 2) {
 628                u8 id, elen;
 629                bool elem_parse_failed;
 630
 631                id = *pos++;
 632                elen = *pos++;
 633                left -= 2;
 634
 635                if (elen > left) {
 636                        elems->parse_error = true;
 637                        break;
 638                }
 639
 640                switch (id) {
 641                case WLAN_EID_SSID:
 642                case WLAN_EID_SUPP_RATES:
 643                case WLAN_EID_FH_PARAMS:
 644                case WLAN_EID_DS_PARAMS:
 645                case WLAN_EID_CF_PARAMS:
 646                case WLAN_EID_TIM:
 647                case WLAN_EID_IBSS_PARAMS:
 648                case WLAN_EID_CHALLENGE:
 649                case WLAN_EID_RSN:
 650                case WLAN_EID_ERP_INFO:
 651                case WLAN_EID_EXT_SUPP_RATES:
 652                case WLAN_EID_HT_CAPABILITY:
 653                case WLAN_EID_HT_OPERATION:
 654                case WLAN_EID_VHT_CAPABILITY:
 655                case WLAN_EID_VHT_OPERATION:
 656                case WLAN_EID_MESH_ID:
 657                case WLAN_EID_MESH_CONFIG:
 658                case WLAN_EID_PEER_MGMT:
 659                case WLAN_EID_PREQ:
 660                case WLAN_EID_PREP:
 661                case WLAN_EID_PERR:
 662                case WLAN_EID_RANN:
 663                case WLAN_EID_CHANNEL_SWITCH:
 664                case WLAN_EID_EXT_CHANSWITCH_ANN:
 665                case WLAN_EID_COUNTRY:
 666                case WLAN_EID_PWR_CONSTRAINT:
 667                case WLAN_EID_TIMEOUT_INTERVAL:
 668                        if (test_bit(id, seen_elems)) {
 669                                elems->parse_error = true;
 670                                left -= elen;
 671                                pos += elen;
 672                                continue;
 673                        }
 674                        break;
 675                }
 676
 677                if (calc_crc && id < 64 && (filter & (1ULL << id)))
 678                        crc = crc32_be(crc, pos - 2, elen + 2);
 679
 680                elem_parse_failed = false;
 681
 682                switch (id) {
 683                case WLAN_EID_SSID:
 684                        elems->ssid = pos;
 685                        elems->ssid_len = elen;
 686                        break;
 687                case WLAN_EID_SUPP_RATES:
 688                        elems->supp_rates = pos;
 689                        elems->supp_rates_len = elen;
 690                        break;
 691                case WLAN_EID_FH_PARAMS:
 692                        elems->fh_params = pos;
 693                        elems->fh_params_len = elen;
 694                        break;
 695                case WLAN_EID_DS_PARAMS:
 696                        elems->ds_params = pos;
 697                        elems->ds_params_len = elen;
 698                        break;
 699                case WLAN_EID_CF_PARAMS:
 700                        elems->cf_params = pos;
 701                        elems->cf_params_len = elen;
 702                        break;
 703                case WLAN_EID_TIM:
 704                        if (elen >= sizeof(struct ieee80211_tim_ie)) {
 705                                elems->tim = (void *)pos;
 706                                elems->tim_len = elen;
 707                        } else
 708                                elem_parse_failed = true;
 709                        break;
 710                case WLAN_EID_IBSS_PARAMS:
 711                        elems->ibss_params = pos;
 712                        elems->ibss_params_len = elen;
 713                        break;
 714                case WLAN_EID_CHALLENGE:
 715                        elems->challenge = pos;
 716                        elems->challenge_len = elen;
 717                        break;
 718                case WLAN_EID_VENDOR_SPECIFIC:
 719                        if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 720                            pos[2] == 0xf2) {
 721                                /* Microsoft OUI (00:50:F2) */
 722
 723                                if (calc_crc)
 724                                        crc = crc32_be(crc, pos - 2, elen + 2);
 725
 726                                if (pos[3] == 1) {
 727                                        /* OUI Type 1 - WPA IE */
 728                                        elems->wpa = pos;
 729                                        elems->wpa_len = elen;
 730                                } else if (elen >= 5 && pos[3] == 2) {
 731                                        /* OUI Type 2 - WMM IE */
 732                                        if (pos[4] == 0) {
 733                                                elems->wmm_info = pos;
 734                                                elems->wmm_info_len = elen;
 735                                        } else if (pos[4] == 1) {
 736                                                elems->wmm_param = pos;
 737                                                elems->wmm_param_len = elen;
 738                                        }
 739                                }
 740                        }
 741                        break;
 742                case WLAN_EID_RSN:
 743                        elems->rsn = pos;
 744                        elems->rsn_len = elen;
 745                        break;
 746                case WLAN_EID_ERP_INFO:
 747                        elems->erp_info = pos;
 748                        elems->erp_info_len = elen;
 749                        break;
 750                case WLAN_EID_EXT_SUPP_RATES:
 751                        elems->ext_supp_rates = pos;
 752                        elems->ext_supp_rates_len = elen;
 753                        break;
 754                case WLAN_EID_HT_CAPABILITY:
 755                        if (elen >= sizeof(struct ieee80211_ht_cap))
 756                                elems->ht_cap_elem = (void *)pos;
 757                        else
 758                                elem_parse_failed = true;
 759                        break;
 760                case WLAN_EID_HT_OPERATION:
 761                        if (elen >= sizeof(struct ieee80211_ht_operation))
 762                                elems->ht_operation = (void *)pos;
 763                        else
 764                                elem_parse_failed = true;
 765                        break;
 766                case WLAN_EID_MESH_ID:
 767                        elems->mesh_id = pos;
 768                        elems->mesh_id_len = elen;
 769                        break;
 770                case WLAN_EID_MESH_CONFIG:
 771                        if (elen >= sizeof(struct ieee80211_meshconf_ie))
 772                                elems->mesh_config = (void *)pos;
 773                        else
 774                                elem_parse_failed = true;
 775                        break;
 776                case WLAN_EID_PEER_MGMT:
 777                        elems->peering = pos;
 778                        elems->peering_len = elen;
 779                        break;
 780                case WLAN_EID_PREQ:
 781                        elems->preq = pos;
 782                        elems->preq_len = elen;
 783                        break;
 784                case WLAN_EID_PREP:
 785                        elems->prep = pos;
 786                        elems->prep_len = elen;
 787                        break;
 788                case WLAN_EID_PERR:
 789                        elems->perr = pos;
 790                        elems->perr_len = elen;
 791                        break;
 792                case WLAN_EID_RANN:
 793                        if (elen >= sizeof(struct ieee80211_rann_ie))
 794                                elems->rann = (void *)pos;
 795                        else
 796                                elem_parse_failed = true;
 797                        break;
 798                case WLAN_EID_CHANNEL_SWITCH:
 799                        elems->ch_switch_elem = pos;
 800                        elems->ch_switch_elem_len = elen;
 801                        break;
 802                case WLAN_EID_QUIET:
 803                        if (!elems->quiet_elem) {
 804                                elems->quiet_elem = pos;
 805                                elems->quiet_elem_len = elen;
 806                        }
 807                        elems->num_of_quiet_elem++;
 808                        break;
 809                case WLAN_EID_COUNTRY:
 810                        elems->country_elem = pos;
 811                        elems->country_elem_len = elen;
 812                        break;
 813                case WLAN_EID_PWR_CONSTRAINT:
 814                        elems->pwr_constr_elem = pos;
 815                        elems->pwr_constr_elem_len = elen;
 816                        break;
 817                case WLAN_EID_TIMEOUT_INTERVAL:
 818                        elems->timeout_int = pos;
 819                        elems->timeout_int_len = elen;
 820                        break;
 821                default:
 822                        break;
 823                }
 824
 825                if (elem_parse_failed)
 826                        elems->parse_error = true;
 827                else
 828                        set_bit(id, seen_elems);
 829
 830                left -= elen;
 831                pos += elen;
 832        }
 833
 834        if (left != 0)
 835                elems->parse_error = true;
 836
 837        return crc;
 838}
 839
 840void ieee802_11_parse_elems(u8 *start, size_t len,
 841                            struct ieee802_11_elems *elems)
 842{
 843        ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 844}
 845
 846void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 847                               bool bss_notify)
 848{
 849        struct ieee80211_local *local = sdata->local;
 850        struct ieee80211_tx_queue_params qparam;
 851        int ac;
 852        bool use_11b, enable_qos;
 853        int aCWmin, aCWmax;
 854
 855        if (!local->ops->conf_tx)
 856                return;
 857
 858        if (local->hw.queues < IEEE80211_NUM_ACS)
 859                return;
 860
 861        memset(&qparam, 0, sizeof(qparam));
 862
 863        use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 864                 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 865
 866        /*
 867         * By default disable QoS in STA mode for old access points, which do
 868         * not support 802.11e. New APs will provide proper queue parameters,
 869         * that we will configure later.
 870         */
 871        enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 872
 873        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 874                /* Set defaults according to 802.11-2007 Table 7-37 */
 875                aCWmax = 1023;
 876                if (use_11b)
 877                        aCWmin = 31;
 878                else
 879                        aCWmin = 15;
 880
 881                if (enable_qos) {
 882                        switch (ac) {
 883                        case IEEE80211_AC_BK:
 884                                qparam.cw_max = aCWmax;
 885                                qparam.cw_min = aCWmin;
 886                                qparam.txop = 0;
 887                                qparam.aifs = 7;
 888                                break;
 889                        /* never happens but let's not leave undefined */
 890                        default:
 891                        case IEEE80211_AC_BE:
 892                                qparam.cw_max = aCWmax;
 893                                qparam.cw_min = aCWmin;
 894                                qparam.txop = 0;
 895                                qparam.aifs = 3;
 896                                break;
 897                        case IEEE80211_AC_VI:
 898                                qparam.cw_max = aCWmin;
 899                                qparam.cw_min = (aCWmin + 1) / 2 - 1;
 900                                if (use_11b)
 901                                        qparam.txop = 6016/32;
 902                                else
 903                                        qparam.txop = 3008/32;
 904                                qparam.aifs = 2;
 905                                break;
 906                        case IEEE80211_AC_VO:
 907                                qparam.cw_max = (aCWmin + 1) / 2 - 1;
 908                                qparam.cw_min = (aCWmin + 1) / 4 - 1;
 909                                if (use_11b)
 910                                        qparam.txop = 3264/32;
 911                                else
 912                                        qparam.txop = 1504/32;
 913                                qparam.aifs = 2;
 914                                break;
 915                        }
 916                } else {
 917                        /* Confiure old 802.11b/g medium access rules. */
 918                        qparam.cw_max = aCWmax;
 919                        qparam.cw_min = aCWmin;
 920                        qparam.txop = 0;
 921                        qparam.aifs = 2;
 922                }
 923
 924                qparam.uapsd = false;
 925
 926                sdata->tx_conf[ac] = qparam;
 927                drv_conf_tx(local, sdata, ac, &qparam);
 928        }
 929
 930        if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 931                sdata->vif.bss_conf.qos = enable_qos;
 932                if (bss_notify)
 933                        ieee80211_bss_info_change_notify(sdata,
 934                                                         BSS_CHANGED_QOS);
 935        }
 936}
 937
 938void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 939                                  const size_t supp_rates_len,
 940                                  const u8 *supp_rates)
 941{
 942        struct ieee80211_local *local = sdata->local;
 943        int i, have_higher_than_11mbit = 0;
 944
 945        /* cf. IEEE 802.11 9.2.12 */
 946        for (i = 0; i < supp_rates_len; i++)
 947                if ((supp_rates[i] & 0x7f) * 5 > 110)
 948                        have_higher_than_11mbit = 1;
 949
 950        if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 951            have_higher_than_11mbit)
 952                sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 953        else
 954                sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 955
 956        ieee80211_set_wmm_default(sdata, true);
 957}
 958
 959u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 960                              enum ieee80211_band band)
 961{
 962        struct ieee80211_supported_band *sband;
 963        struct ieee80211_rate *bitrates;
 964        u32 mandatory_rates;
 965        enum ieee80211_rate_flags mandatory_flag;
 966        int i;
 967
 968        sband = local->hw.wiphy->bands[band];
 969        if (WARN_ON(!sband))
 970                return 1;
 971
 972        if (band == IEEE80211_BAND_2GHZ)
 973                mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 974        else
 975                mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 976
 977        bitrates = sband->bitrates;
 978        mandatory_rates = 0;
 979        for (i = 0; i < sband->n_bitrates; i++)
 980                if (bitrates[i].flags & mandatory_flag)
 981                        mandatory_rates |= BIT(i);
 982        return mandatory_rates;
 983}
 984
 985void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 986                         u16 transaction, u16 auth_alg,
 987                         u8 *extra, size_t extra_len, const u8 *da,
 988                         const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 989{
 990        struct ieee80211_local *local = sdata->local;
 991        struct sk_buff *skb;
 992        struct ieee80211_mgmt *mgmt;
 993        int err;
 994
 995        skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 996                            sizeof(*mgmt) + 6 + extra_len);
 997        if (!skb)
 998                return;
 999
1000        skb_reserve(skb, local->hw.extra_tx_headroom);
1001
1002        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1003        memset(mgmt, 0, 24 + 6);
1004        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1005                                          IEEE80211_STYPE_AUTH);
1006        memcpy(mgmt->da, da, ETH_ALEN);
1007        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1008        memcpy(mgmt->bssid, bssid, ETH_ALEN);
1009        mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1010        mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1011        mgmt->u.auth.status_code = cpu_to_le16(0);
1012        if (extra)
1013                memcpy(skb_put(skb, extra_len), extra, extra_len);
1014
1015        if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1016                mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1017                err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1018                WARN_ON(err);
1019        }
1020
1021        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1022        ieee80211_tx_skb(sdata, skb);
1023}
1024
1025int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1026                             const u8 *ie, size_t ie_len,
1027                             enum ieee80211_band band, u32 rate_mask,
1028                             u8 channel)
1029{
1030        struct ieee80211_supported_band *sband;
1031        u8 *pos;
1032        size_t offset = 0, noffset;
1033        int supp_rates_len, i;
1034        u8 rates[32];
1035        int num_rates;
1036        int ext_rates_len;
1037
1038        sband = local->hw.wiphy->bands[band];
1039        if (WARN_ON_ONCE(!sband))
1040                return 0;
1041
1042        pos = buffer;
1043
1044        num_rates = 0;
1045        for (i = 0; i < sband->n_bitrates; i++) {
1046                if ((BIT(i) & rate_mask) == 0)
1047                        continue; /* skip rate */
1048                rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1049        }
1050
1051        supp_rates_len = min_t(int, num_rates, 8);
1052
1053        *pos++ = WLAN_EID_SUPP_RATES;
1054        *pos++ = supp_rates_len;
1055        memcpy(pos, rates, supp_rates_len);
1056        pos += supp_rates_len;
1057
1058        /* insert "request information" if in custom IEs */
1059        if (ie && ie_len) {
1060                static const u8 before_extrates[] = {
1061                        WLAN_EID_SSID,
1062                        WLAN_EID_SUPP_RATES,
1063                        WLAN_EID_REQUEST,
1064                };
1065                noffset = ieee80211_ie_split(ie, ie_len,
1066                                             before_extrates,
1067                                             ARRAY_SIZE(before_extrates),
1068                                             offset);
1069                memcpy(pos, ie + offset, noffset - offset);
1070                pos += noffset - offset;
1071                offset = noffset;
1072        }
1073
1074        ext_rates_len = num_rates - supp_rates_len;
1075        if (ext_rates_len > 0) {
1076                *pos++ = WLAN_EID_EXT_SUPP_RATES;
1077                *pos++ = ext_rates_len;
1078                memcpy(pos, rates + supp_rates_len, ext_rates_len);
1079                pos += ext_rates_len;
1080        }
1081
1082        if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1083                *pos++ = WLAN_EID_DS_PARAMS;
1084                *pos++ = 1;
1085                *pos++ = channel;
1086        }
1087
1088        /* insert custom IEs that go before HT */
1089        if (ie && ie_len) {
1090                static const u8 before_ht[] = {
1091                        WLAN_EID_SSID,
1092                        WLAN_EID_SUPP_RATES,
1093                        WLAN_EID_REQUEST,
1094                        WLAN_EID_EXT_SUPP_RATES,
1095                        WLAN_EID_DS_PARAMS,
1096                        WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1097                };
1098                noffset = ieee80211_ie_split(ie, ie_len,
1099                                             before_ht, ARRAY_SIZE(before_ht),
1100                                             offset);
1101                memcpy(pos, ie + offset, noffset - offset);
1102                pos += noffset - offset;
1103                offset = noffset;
1104        }
1105
1106        if (sband->ht_cap.ht_supported)
1107                pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1108                                                sband->ht_cap.cap);
1109
1110        /*
1111         * If adding more here, adjust code in main.c
1112         * that calculates local->scan_ies_len.
1113         */
1114
1115        /* add any remaining custom IEs */
1116        if (ie && ie_len) {
1117                noffset = ie_len;
1118                memcpy(pos, ie + offset, noffset - offset);
1119                pos += noffset - offset;
1120        }
1121
1122        if (sband->vht_cap.vht_supported)
1123                pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1124                                                 sband->vht_cap.cap);
1125
1126        return pos - buffer;
1127}
1128
1129struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1130                                          u8 *dst, u32 ratemask,
1131                                          const u8 *ssid, size_t ssid_len,
1132                                          const u8 *ie, size_t ie_len,
1133                                          bool directed)
1134{
1135        struct ieee80211_local *local = sdata->local;
1136        struct sk_buff *skb;
1137        struct ieee80211_mgmt *mgmt;
1138        size_t buf_len;
1139        u8 *buf;
1140        u8 chan;
1141
1142        /* FIXME: come up with a proper value */
1143        buf = kmalloc(200 + ie_len, GFP_KERNEL);
1144        if (!buf)
1145                return NULL;
1146
1147        /*
1148         * Do not send DS Channel parameter for directed probe requests
1149         * in order to maximize the chance that we get a response.  Some
1150         * badly-behaved APs don't respond when this parameter is included.
1151         */
1152        if (directed)
1153                chan = 0;
1154        else
1155                chan = ieee80211_frequency_to_channel(
1156                        local->hw.conf.channel->center_freq);
1157
1158        buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1159                                           local->hw.conf.channel->band,
1160                                           ratemask, chan);
1161
1162        skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1163                                     ssid, ssid_len,
1164                                     buf, buf_len);
1165        if (!skb)
1166                goto out;
1167
1168        if (dst) {
1169                mgmt = (struct ieee80211_mgmt *) skb->data;
1170                memcpy(mgmt->da, dst, ETH_ALEN);
1171                memcpy(mgmt->bssid, dst, ETH_ALEN);
1172        }
1173
1174        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1175
1176 out:
1177        kfree(buf);
1178
1179        return skb;
1180}
1181
1182void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1183                              const u8 *ssid, size_t ssid_len,
1184                              const u8 *ie, size_t ie_len,
1185                              u32 ratemask, bool directed, bool no_cck)
1186{
1187        struct sk_buff *skb;
1188
1189        skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1190                                        ie, ie_len, directed);
1191        if (skb) {
1192                if (no_cck)
1193                        IEEE80211_SKB_CB(skb)->flags |=
1194                                IEEE80211_TX_CTL_NO_CCK_RATE;
1195                ieee80211_tx_skb(sdata, skb);
1196        }
1197}
1198
1199u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1200                            struct ieee802_11_elems *elems,
1201                            enum ieee80211_band band, u32 *basic_rates)
1202{
1203        struct ieee80211_supported_band *sband;
1204        struct ieee80211_rate *bitrates;
1205        size_t num_rates;
1206        u32 supp_rates;
1207        int i, j;
1208        sband = local->hw.wiphy->bands[band];
1209
1210        if (WARN_ON(!sband))
1211                return 1;
1212
1213        bitrates = sband->bitrates;
1214        num_rates = sband->n_bitrates;
1215        supp_rates = 0;
1216        for (i = 0; i < elems->supp_rates_len +
1217                     elems->ext_supp_rates_len; i++) {
1218                u8 rate = 0;
1219                int own_rate;
1220                bool is_basic;
1221                if (i < elems->supp_rates_len)
1222                        rate = elems->supp_rates[i];
1223                else if (elems->ext_supp_rates)
1224                        rate = elems->ext_supp_rates
1225                                [i - elems->supp_rates_len];
1226                own_rate = 5 * (rate & 0x7f);
1227                is_basic = !!(rate & 0x80);
1228
1229                if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1230                        continue;
1231
1232                for (j = 0; j < num_rates; j++) {
1233                        if (bitrates[j].bitrate == own_rate) {
1234                                supp_rates |= BIT(j);
1235                                if (basic_rates && is_basic)
1236                                        *basic_rates |= BIT(j);
1237                        }
1238                }
1239        }
1240        return supp_rates;
1241}
1242
1243void ieee80211_stop_device(struct ieee80211_local *local)
1244{
1245        ieee80211_led_radio(local, false);
1246        ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1247
1248        cancel_work_sync(&local->reconfig_filter);
1249
1250        flush_workqueue(local->workqueue);
1251        drv_stop(local);
1252}
1253
1254int ieee80211_reconfig(struct ieee80211_local *local)
1255{
1256        struct ieee80211_hw *hw = &local->hw;
1257        struct ieee80211_sub_if_data *sdata;
1258        struct sta_info *sta;
1259        int res, i;
1260
1261#ifdef CONFIG_PM
1262        if (local->suspended)
1263                local->resuming = true;
1264
1265        if (local->wowlan) {
1266                local->wowlan = false;
1267                res = drv_resume(local);
1268                if (res < 0) {
1269                        local->resuming = false;
1270                        return res;
1271                }
1272                if (res == 0)
1273                        goto wake_up;
1274                WARN_ON(res > 1);
1275                /*
1276                 * res is 1, which means the driver requested
1277                 * to go through a regular reset on wakeup.
1278                 */
1279        }
1280#endif
1281        /* everything else happens only if HW was up & running */
1282        if (!local->open_count)
1283                goto wake_up;
1284
1285        /*
1286         * Upon resume hardware can sometimes be goofy due to
1287         * various platform / driver / bus issues, so restarting
1288         * the device may at times not work immediately. Propagate
1289         * the error.
1290         */
1291        res = drv_start(local);
1292        if (res) {
1293                WARN(local->suspended, "Hardware became unavailable "
1294                     "upon resume. This could be a software issue "
1295                     "prior to suspend or a hardware issue.\n");
1296                return res;
1297        }
1298
1299        /* setup fragmentation threshold */
1300        drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1301
1302        /* setup RTS threshold */
1303        drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1304
1305        /* reset coverage class */
1306        drv_set_coverage_class(local, hw->wiphy->coverage_class);
1307
1308        ieee80211_led_radio(local, true);
1309        ieee80211_mod_tpt_led_trig(local,
1310                                   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1311
1312        /* add interfaces */
1313        sdata = rtnl_dereference(local->monitor_sdata);
1314        if (sdata) {
1315                res = drv_add_interface(local, sdata);
1316                if (WARN_ON(res)) {
1317                        rcu_assign_pointer(local->monitor_sdata, NULL);
1318                        synchronize_net();
1319                        kfree(sdata);
1320                }
1321        }
1322
1323        list_for_each_entry(sdata, &local->interfaces, list) {
1324                if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1325                    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1326                    ieee80211_sdata_running(sdata))
1327                        res = drv_add_interface(local, sdata);
1328        }
1329
1330        /* add STAs back */
1331        mutex_lock(&local->sta_mtx);
1332        list_for_each_entry(sta, &local->sta_list, list) {
1333                enum ieee80211_sta_state state;
1334
1335                if (!sta->uploaded)
1336                        continue;
1337
1338                /* AP-mode stations will be added later */
1339                if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1340                        continue;
1341
1342                for (state = IEEE80211_STA_NOTEXIST;
1343                     state < sta->sta_state; state++)
1344                        WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1345                                              state + 1));
1346        }
1347        mutex_unlock(&local->sta_mtx);
1348
1349        /* reconfigure tx conf */
1350        if (hw->queues >= IEEE80211_NUM_ACS) {
1351                list_for_each_entry(sdata, &local->interfaces, list) {
1352                        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1353                            sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1354                            !ieee80211_sdata_running(sdata))
1355                                continue;
1356
1357                        for (i = 0; i < IEEE80211_NUM_ACS; i++)
1358                                drv_conf_tx(local, sdata, i,
1359                                            &sdata->tx_conf[i]);
1360                }
1361        }
1362
1363        /* reconfigure hardware */
1364        ieee80211_hw_config(local, ~0);
1365
1366        ieee80211_configure_filter(local);
1367
1368        /* Finally also reconfigure all the BSS information */
1369        list_for_each_entry(sdata, &local->interfaces, list) {
1370                u32 changed;
1371
1372                if (!ieee80211_sdata_running(sdata))
1373                        continue;
1374
1375                /* common change flags for all interface types */
1376                changed = BSS_CHANGED_ERP_CTS_PROT |
1377                          BSS_CHANGED_ERP_PREAMBLE |
1378                          BSS_CHANGED_ERP_SLOT |
1379                          BSS_CHANGED_HT |
1380                          BSS_CHANGED_BASIC_RATES |
1381                          BSS_CHANGED_BEACON_INT |
1382                          BSS_CHANGED_BSSID |
1383                          BSS_CHANGED_CQM |
1384                          BSS_CHANGED_QOS |
1385                          BSS_CHANGED_IDLE;
1386
1387                switch (sdata->vif.type) {
1388                case NL80211_IFTYPE_STATION:
1389                        changed |= BSS_CHANGED_ASSOC |
1390                                   BSS_CHANGED_ARP_FILTER;
1391                        mutex_lock(&sdata->u.mgd.mtx);
1392                        ieee80211_bss_info_change_notify(sdata, changed);
1393                        mutex_unlock(&sdata->u.mgd.mtx);
1394                        break;
1395                case NL80211_IFTYPE_ADHOC:
1396                        changed |= BSS_CHANGED_IBSS;
1397                        /* fall through */
1398                case NL80211_IFTYPE_AP:
1399                        changed |= BSS_CHANGED_SSID;
1400
1401                        if (sdata->vif.type == NL80211_IFTYPE_AP)
1402                                changed |= BSS_CHANGED_AP_PROBE_RESP;
1403
1404                        /* fall through */
1405                case NL80211_IFTYPE_MESH_POINT:
1406                        changed |= BSS_CHANGED_BEACON |
1407                                   BSS_CHANGED_BEACON_ENABLED;
1408                        ieee80211_bss_info_change_notify(sdata, changed);
1409                        break;
1410                case NL80211_IFTYPE_WDS:
1411                        break;
1412                case NL80211_IFTYPE_AP_VLAN:
1413                case NL80211_IFTYPE_MONITOR:
1414                        /* ignore virtual */
1415                        break;
1416                case NL80211_IFTYPE_UNSPECIFIED:
1417                case NUM_NL80211_IFTYPES:
1418                case NL80211_IFTYPE_P2P_CLIENT:
1419                case NL80211_IFTYPE_P2P_GO:
1420                        WARN_ON(1);
1421                        break;
1422                }
1423        }
1424
1425        ieee80211_recalc_ps(local, -1);
1426
1427        /*
1428         * The sta might be in psm against the ap (e.g. because
1429         * this was the state before a hw restart), so we
1430         * explicitly send a null packet in order to make sure
1431         * it'll sync against the ap (and get out of psm).
1432         */
1433        if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1434                list_for_each_entry(sdata, &local->interfaces, list) {
1435                        if (sdata->vif.type != NL80211_IFTYPE_STATION)
1436                                continue;
1437                        if (!sdata->u.mgd.associated)
1438                                continue;
1439
1440                        ieee80211_send_nullfunc(local, sdata, 0);
1441                }
1442        }
1443
1444        /* APs are now beaconing, add back stations */
1445        mutex_lock(&local->sta_mtx);
1446        list_for_each_entry(sta, &local->sta_list, list) {
1447                enum ieee80211_sta_state state;
1448
1449                if (!sta->uploaded)
1450                        continue;
1451
1452                if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1453                        continue;
1454
1455                for (state = IEEE80211_STA_NOTEXIST;
1456                     state < sta->sta_state; state++)
1457                        WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1458                                              state + 1));
1459        }
1460        mutex_unlock(&local->sta_mtx);
1461
1462        /* add back keys */
1463        list_for_each_entry(sdata, &local->interfaces, list)
1464                if (ieee80211_sdata_running(sdata))
1465                        ieee80211_enable_keys(sdata);
1466
1467 wake_up:
1468        local->in_reconfig = false;
1469        barrier();
1470
1471        /*
1472         * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1473         * sessions can be established after a resume.
1474         *
1475         * Also tear down aggregation sessions since reconfiguring
1476         * them in a hardware restart scenario is not easily done
1477         * right now, and the hardware will have lost information
1478         * about the sessions, but we and the AP still think they
1479         * are active. This is really a workaround though.
1480         */
1481        if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1482                mutex_lock(&local->sta_mtx);
1483
1484                list_for_each_entry(sta, &local->sta_list, list) {
1485                        ieee80211_sta_tear_down_BA_sessions(sta, true);
1486                        clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1487                }
1488
1489                mutex_unlock(&local->sta_mtx);
1490        }
1491
1492        ieee80211_wake_queues_by_reason(hw,
1493                        IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1494
1495        /*
1496         * If this is for hw restart things are still running.
1497         * We may want to change that later, however.
1498         */
1499        if (!local->suspended)
1500                return 0;
1501
1502#ifdef CONFIG_PM
1503        /* first set suspended false, then resuming */
1504        local->suspended = false;
1505        mb();
1506        local->resuming = false;
1507
1508        list_for_each_entry(sdata, &local->interfaces, list) {
1509                switch(sdata->vif.type) {
1510                case NL80211_IFTYPE_STATION:
1511                        ieee80211_sta_restart(sdata);
1512                        break;
1513                case NL80211_IFTYPE_ADHOC:
1514                        ieee80211_ibss_restart(sdata);
1515                        break;
1516                case NL80211_IFTYPE_MESH_POINT:
1517                        ieee80211_mesh_restart(sdata);
1518                        break;
1519                default:
1520                        break;
1521                }
1522        }
1523
1524        mod_timer(&local->sta_cleanup, jiffies + 1);
1525
1526        mutex_lock(&local->sta_mtx);
1527        list_for_each_entry(sta, &local->sta_list, list)
1528                mesh_plink_restart(sta);
1529        mutex_unlock(&local->sta_mtx);
1530#else
1531        WARN_ON(1);
1532#endif
1533        return 0;
1534}
1535
1536void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1537{
1538        struct ieee80211_sub_if_data *sdata;
1539        struct ieee80211_local *local;
1540        struct ieee80211_key *key;
1541
1542        if (WARN_ON(!vif))
1543                return;
1544
1545        sdata = vif_to_sdata(vif);
1546        local = sdata->local;
1547
1548        if (WARN_ON(!local->resuming))
1549                return;
1550
1551        if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1552                return;
1553
1554        sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1555
1556        mutex_lock(&local->key_mtx);
1557        list_for_each_entry(key, &sdata->key_list, list)
1558                key->flags |= KEY_FLAG_TAINTED;
1559        mutex_unlock(&local->key_mtx);
1560}
1561EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1562
1563static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1564                          enum ieee80211_smps_mode *smps_mode)
1565{
1566        if (ifmgd->associated) {
1567                *smps_mode = ifmgd->ap_smps;
1568
1569                if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1570                        if (ifmgd->powersave)
1571                                *smps_mode = IEEE80211_SMPS_DYNAMIC;
1572                        else
1573                                *smps_mode = IEEE80211_SMPS_OFF;
1574                }
1575
1576                return 1;
1577        }
1578
1579        return 0;
1580}
1581
1582/* must hold iflist_mtx */
1583void ieee80211_recalc_smps(struct ieee80211_local *local)
1584{
1585        struct ieee80211_sub_if_data *sdata;
1586        enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1587        int count = 0;
1588
1589        lockdep_assert_held(&local->iflist_mtx);
1590
1591        /*
1592         * This function could be improved to handle multiple
1593         * interfaces better, but right now it makes any
1594         * non-station interfaces force SM PS to be turned
1595         * off. If there are multiple station interfaces it
1596         * could also use the best possible mode, e.g. if
1597         * one is in static and the other in dynamic then
1598         * dynamic is ok.
1599         */
1600
1601        list_for_each_entry(sdata, &local->interfaces, list) {
1602                if (!ieee80211_sdata_running(sdata))
1603                        continue;
1604                if (sdata->vif.type != NL80211_IFTYPE_STATION)
1605                        goto set;
1606
1607                count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1608
1609                if (count > 1) {
1610                        smps_mode = IEEE80211_SMPS_OFF;
1611                        break;
1612                }
1613        }
1614
1615        if (smps_mode == local->smps_mode)
1616                return;
1617
1618 set:
1619        local->smps_mode = smps_mode;
1620        /* changed flag is auto-detected for this */
1621        ieee80211_hw_config(local, 0);
1622}
1623
1624static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1625{
1626        int i;
1627
1628        for (i = 0; i < n_ids; i++)
1629                if (ids[i] == id)
1630                        return true;
1631        return false;
1632}
1633
1634/**
1635 * ieee80211_ie_split - split an IE buffer according to ordering
1636 *
1637 * @ies: the IE buffer
1638 * @ielen: the length of the IE buffer
1639 * @ids: an array with element IDs that are allowed before
1640 *      the split
1641 * @n_ids: the size of the element ID array
1642 * @offset: offset where to start splitting in the buffer
1643 *
1644 * This function splits an IE buffer by updating the @offset
1645 * variable to point to the location where the buffer should be
1646 * split.
1647 *
1648 * It assumes that the given IE buffer is well-formed, this
1649 * has to be guaranteed by the caller!
1650 *
1651 * It also assumes that the IEs in the buffer are ordered
1652 * correctly, if not the result of using this function will not
1653 * be ordered correctly either, i.e. it does no reordering.
1654 *
1655 * The function returns the offset where the next part of the
1656 * buffer starts, which may be @ielen if the entire (remainder)
1657 * of the buffer should be used.
1658 */
1659size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1660                          const u8 *ids, int n_ids, size_t offset)
1661{
1662        size_t pos = offset;
1663
1664        while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1665                pos += 2 + ies[pos + 1];
1666
1667        return pos;
1668}
1669
1670size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1671{
1672        size_t pos = offset;
1673
1674        while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1675                pos += 2 + ies[pos + 1];
1676
1677        return pos;
1678}
1679
1680static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1681                                            int rssi_min_thold,
1682                                            int rssi_max_thold)
1683{
1684        trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1685
1686        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1687                return;
1688
1689        /*
1690         * Scale up threshold values before storing it, as the RSSI averaging
1691         * algorithm uses a scaled up value as well. Change this scaling
1692         * factor if the RSSI averaging algorithm changes.
1693         */
1694        sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1695        sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1696}
1697
1698void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1699                                    int rssi_min_thold,
1700                                    int rssi_max_thold)
1701{
1702        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1703
1704        WARN_ON(rssi_min_thold == rssi_max_thold ||
1705                rssi_min_thold > rssi_max_thold);
1706
1707        _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1708                                       rssi_max_thold);
1709}
1710EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1711
1712void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1713{
1714        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1715
1716        _ieee80211_enable_rssi_reports(sdata, 0, 0);
1717}
1718EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1719
1720u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1721                              u16 cap)
1722{
1723        __le16 tmp;
1724
1725        *pos++ = WLAN_EID_HT_CAPABILITY;
1726        *pos++ = sizeof(struct ieee80211_ht_cap);
1727        memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1728
1729        /* capability flags */
1730        tmp = cpu_to_le16(cap);
1731        memcpy(pos, &tmp, sizeof(u16));
1732        pos += sizeof(u16);
1733
1734        /* AMPDU parameters */
1735        *pos++ = ht_cap->ampdu_factor |
1736                 (ht_cap->ampdu_density <<
1737                        IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1738
1739        /* MCS set */
1740        memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1741        pos += sizeof(ht_cap->mcs);
1742
1743        /* extended capabilities */
1744        pos += sizeof(__le16);
1745
1746        /* BF capabilities */
1747        pos += sizeof(__le32);
1748
1749        /* antenna selection */
1750        pos += sizeof(u8);
1751
1752        return pos;
1753}
1754
1755u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1756                                                           u32 cap)
1757{
1758        __le32 tmp;
1759
1760        *pos++ = WLAN_EID_VHT_CAPABILITY;
1761        *pos++ = sizeof(struct ieee80211_vht_capabilities);
1762        memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1763
1764        /* capability flags */
1765        tmp = cpu_to_le32(cap);
1766        memcpy(pos, &tmp, sizeof(u32));
1767        pos += sizeof(u32);
1768
1769        /* VHT MCS set */
1770        memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1771        pos += sizeof(vht_cap->vht_mcs);
1772
1773        return pos;
1774}
1775
1776u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1777                               struct ieee80211_channel *channel,
1778                               enum nl80211_channel_type channel_type,
1779                               u16 prot_mode)
1780{
1781        struct ieee80211_ht_operation *ht_oper;
1782        /* Build HT Information */
1783        *pos++ = WLAN_EID_HT_OPERATION;
1784        *pos++ = sizeof(struct ieee80211_ht_operation);
1785        ht_oper = (struct ieee80211_ht_operation *)pos;
1786        ht_oper->primary_chan =
1787                        ieee80211_frequency_to_channel(channel->center_freq);
1788        switch (channel_type) {
1789        case NL80211_CHAN_HT40MINUS:
1790                ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1791                break;
1792        case NL80211_CHAN_HT40PLUS:
1793                ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1794                break;
1795        case NL80211_CHAN_HT20:
1796        default:
1797                ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1798                break;
1799        }
1800        if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1801            channel_type != NL80211_CHAN_NO_HT &&
1802            channel_type != NL80211_CHAN_HT20)
1803                ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1804
1805        ht_oper->operation_mode = cpu_to_le16(prot_mode);
1806        ht_oper->stbc_param = 0x0000;
1807
1808        /* It seems that Basic MCS set and Supported MCS set
1809           are identical for the first 10 bytes */
1810        memset(&ht_oper->basic_set, 0, 16);
1811        memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1812
1813        return pos + sizeof(struct ieee80211_ht_operation);
1814}
1815
1816enum nl80211_channel_type
1817ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1818{
1819        enum nl80211_channel_type channel_type;
1820
1821        if (!ht_oper)
1822                return NL80211_CHAN_NO_HT;
1823
1824        switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1825        case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1826                channel_type = NL80211_CHAN_HT20;
1827                break;
1828        case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1829                channel_type = NL80211_CHAN_HT40PLUS;
1830                break;
1831        case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1832                channel_type = NL80211_CHAN_HT40MINUS;
1833                break;
1834        default:
1835                channel_type = NL80211_CHAN_NO_HT;
1836        }
1837
1838        return channel_type;
1839}
1840
1841int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1842                            struct sk_buff *skb, bool need_basic)
1843{
1844        struct ieee80211_local *local = sdata->local;
1845        struct ieee80211_supported_band *sband;
1846        int rate;
1847        u8 i, rates, *pos;
1848        u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1849
1850        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1851        rates = sband->n_bitrates;
1852        if (rates > 8)
1853                rates = 8;
1854
1855        if (skb_tailroom(skb) < rates + 2)
1856                return -ENOMEM;
1857
1858        pos = skb_put(skb, rates + 2);
1859        *pos++ = WLAN_EID_SUPP_RATES;
1860        *pos++ = rates;
1861        for (i = 0; i < rates; i++) {
1862                u8 basic = 0;
1863                if (need_basic && basic_rates & BIT(i))
1864                        basic = 0x80;
1865                rate = sband->bitrates[i].bitrate;
1866                *pos++ = basic | (u8) (rate / 5);
1867        }
1868
1869        return 0;
1870}
1871
1872int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1873                                struct sk_buff *skb, bool need_basic)
1874{
1875        struct ieee80211_local *local = sdata->local;
1876        struct ieee80211_supported_band *sband;
1877        int rate;
1878        u8 i, exrates, *pos;
1879        u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1880
1881        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1882        exrates = sband->n_bitrates;
1883        if (exrates > 8)
1884                exrates -= 8;
1885        else
1886                exrates = 0;
1887
1888        if (skb_tailroom(skb) < exrates + 2)
1889                return -ENOMEM;
1890
1891        if (exrates) {
1892                pos = skb_put(skb, exrates + 2);
1893                *pos++ = WLAN_EID_EXT_SUPP_RATES;
1894                *pos++ = exrates;
1895                for (i = 8; i < sband->n_bitrates; i++) {
1896                        u8 basic = 0;
1897                        if (need_basic && basic_rates & BIT(i))
1898                                basic = 0x80;
1899                        rate = sband->bitrates[i].bitrate;
1900                        *pos++ = basic | (u8) (rate / 5);
1901                }
1902        }
1903        return 0;
1904}
1905
1906int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1907{
1908        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1909        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1910
1911        if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1912                /* non-managed type inferfaces */
1913                return 0;
1914        }
1915        return ifmgd->ave_beacon_signal;
1916}
1917EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
1918
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