net/mac80211/util.c

   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 */
  37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  38
  39 struct 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 }
  47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  48
  49 u8 *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
  98 void 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
 109 int 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 }
 187 EXPORT_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 }
 227 EXPORT_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 }
 266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268 void 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
 298 static 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
 325 void 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
 336 void 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 }
 341 EXPORT_SYMBOL(ieee80211_wake_queue);
 342
 343 static 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
 376 void 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
 387 void 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 }
 392 EXPORT_SYMBOL(ieee80211_stop_queue);
 393
 394 void 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                 kfree_skb(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
 414 void 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                         kfree_skb(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
 449 void 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
 464 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 465 {
 466         ieee80211_stop_queues_by_reason(hw,
 467                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 468 }
 469 EXPORT_SYMBOL(ieee80211_stop_queues);
 470
 471 int 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 }
 485 EXPORT_SYMBOL(ieee80211_queue_stopped);
 486
 487 void 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
 502 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 503 {
 504         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 505 }
 506 EXPORT_SYMBOL(ieee80211_wake_queues);
 507
 508 void 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 }
 539 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 540
 541 void 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 }
 571 EXPORT_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  */
 580 static 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
 589 void 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 }
 598 EXPORT_SYMBOL(ieee80211_queue_work);
 599
 600 void 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 }
 611 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 612
 613 u32 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                 if (id != WLAN_EID_VENDOR_SPECIFIC &&
 641                     id != WLAN_EID_QUIET &&
 642                     test_bit(id, seen_elems)) {
 643                         elems->parse_error = true;
 644                         left -= elen;
 645                         pos += elen;
 646                         continue;
 647                 }
 648
 649                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 650                         crc = crc32_be(crc, pos - 2, elen + 2);
 651
 652                 elem_parse_failed = false;
 653
 654                 switch (id) {
 655                 case WLAN_EID_SSID:
 656                         elems->ssid = pos;
 657                         elems->ssid_len = elen;
 658                         break;
 659                 case WLAN_EID_SUPP_RATES:
 660                         elems->supp_rates = pos;
 661                         elems->supp_rates_len = elen;
 662                         break;
 663                 case WLAN_EID_FH_PARAMS:
 664                         elems->fh_params = pos;
 665                         elems->fh_params_len = elen;
 666                         break;
 667                 case WLAN_EID_DS_PARAMS:
 668                         elems->ds_params = pos;
 669                         elems->ds_params_len = elen;
 670                         break;
 671                 case WLAN_EID_CF_PARAMS:
 672                         elems->cf_params = pos;
 673                         elems->cf_params_len = elen;
 674                         break;
 675                 case WLAN_EID_TIM:
 676                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 677                                 elems->tim = (void *)pos;
 678                                 elems->tim_len = elen;
 679                         } else
 680                                 elem_parse_failed = true;
 681                         break;
 682                 case WLAN_EID_IBSS_PARAMS:
 683                         elems->ibss_params = pos;
 684                         elems->ibss_params_len = elen;
 685                         break;
 686                 case WLAN_EID_CHALLENGE:
 687                         elems->challenge = pos;
 688                         elems->challenge_len = elen;
 689                         break;
 690                 case WLAN_EID_VENDOR_SPECIFIC:
 691                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 692                             pos[2] == 0xf2) {
 693                                 /* Microsoft OUI (00:50:F2) */
 694
 695                                 if (calc_crc)
 696                                         crc = crc32_be(crc, pos - 2, elen + 2);
 697
 698                                 if (pos[3] == 1) {
 699                                         /* OUI Type 1 - WPA IE */
 700                                         elems->wpa = pos;
 701                                         elems->wpa_len = elen;
 702                                 } else if (elen >= 5 && pos[3] == 2) {
 703                                         /* OUI Type 2 - WMM IE */
 704                                         if (pos[4] == 0) {
 705                                                 elems->wmm_info = pos;
 706                                                 elems->wmm_info_len = elen;
 707                                         } else if (pos[4] == 1) {
 708                                                 elems->wmm_param = pos;
 709                                                 elems->wmm_param_len = elen;
 710                                         }
 711                                 }
 712                         }
 713                         break;
 714                 case WLAN_EID_RSN:
 715                         elems->rsn = pos;
 716                         elems->rsn_len = elen;
 717                         break;
 718                 case WLAN_EID_ERP_INFO:
 719                         elems->erp_info = pos;
 720                         elems->erp_info_len = elen;
 721                         break;
 722                 case WLAN_EID_EXT_SUPP_RATES:
 723                         elems->ext_supp_rates = pos;
 724                         elems->ext_supp_rates_len = elen;
 725                         break;
 726                 case WLAN_EID_HT_CAPABILITY:
 727                         if (elen >= sizeof(struct ieee80211_ht_cap))
 728                                 elems->ht_cap_elem = (void *)pos;
 729                         else
 730                                 elem_parse_failed = true;
 731                         break;
 732                 case WLAN_EID_HT_OPERATION:
 733                         if (elen >= sizeof(struct ieee80211_ht_operation))
 734                                 elems->ht_operation = (void *)pos;
 735                         else
 736                                 elem_parse_failed = true;
 737                         break;
 738                 case WLAN_EID_MESH_ID:
 739                         elems->mesh_id = pos;
 740                         elems->mesh_id_len = elen;
 741                         break;
 742                 case WLAN_EID_MESH_CONFIG:
 743                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 744                                 elems->mesh_config = (void *)pos;
 745                         else
 746                                 elem_parse_failed = true;
 747                         break;
 748                 case WLAN_EID_PEER_MGMT:
 749                         elems->peering = pos;
 750                         elems->peering_len = elen;
 751                         break;
 752                 case WLAN_EID_PREQ:
 753                         elems->preq = pos;
 754                         elems->preq_len = elen;
 755                         break;
 756                 case WLAN_EID_PREP:
 757                         elems->prep = pos;
 758                         elems->prep_len = elen;
 759                         break;
 760                 case WLAN_EID_PERR:
 761                         elems->perr = pos;
 762                         elems->perr_len = elen;
 763                         break;
 764                 case WLAN_EID_RANN:
 765                         if (elen >= sizeof(struct ieee80211_rann_ie))
 766                                 elems->rann = (void *)pos;
 767                         else
 768                                 elem_parse_failed = true;
 769                         break;
 770                 case WLAN_EID_CHANNEL_SWITCH:
 771                         elems->ch_switch_elem = pos;
 772                         elems->ch_switch_elem_len = elen;
 773                         break;
 774                 case WLAN_EID_QUIET:
 775                         if (!elems->quiet_elem) {
 776                                 elems->quiet_elem = pos;
 777                                 elems->quiet_elem_len = elen;
 778                         }
 779                         elems->num_of_quiet_elem++;
 780                         break;
 781                 case WLAN_EID_COUNTRY:
 782                         elems->country_elem = pos;
 783                         elems->country_elem_len = elen;
 784                         break;
 785                 case WLAN_EID_PWR_CONSTRAINT:
 786                         elems->pwr_constr_elem = pos;
 787                         elems->pwr_constr_elem_len = elen;
 788                         break;
 789                 case WLAN_EID_TIMEOUT_INTERVAL:
 790                         elems->timeout_int = pos;
 791                         elems->timeout_int_len = elen;
 792                         break;
 793                 default:
 794                         break;
 795                 }
 796
 797                 if (elem_parse_failed)
 798                         elems->parse_error = true;
 799                 else
 800                         set_bit(id, seen_elems);
 801
 802                 left -= elen;
 803                 pos += elen;
 804         }
 805
 806         if (left != 0)
 807                 elems->parse_error = true;
 808
 809         return crc;
 810 }
 811
 812 void ieee802_11_parse_elems(u8 *start, size_t len,
 813                             struct ieee802_11_elems *elems)
 814 {
 815         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 816 }
 817
 818 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 819                                bool bss_notify)
 820 {
 821         struct ieee80211_local *local = sdata->local;
 822         struct ieee80211_tx_queue_params qparam;
 823         int ac;
 824         bool use_11b, enable_qos;
 825         int aCWmin, aCWmax;
 826
 827         if (!local->ops->conf_tx)
 828                 return;
 829
 830         if (local->hw.queues < IEEE80211_NUM_ACS)
 831                 return;
 832
 833         memset(&qparam, 0, sizeof(qparam));
 834
 835         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 836                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 837
 838         /*
 839          * By default disable QoS in STA mode for old access points, which do
 840          * not support 802.11e. New APs will provide proper queue parameters,
 841          * that we will configure later.
 842          */
 843         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 844
 845         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 846                 /* Set defaults according to 802.11-2007 Table 7-37 */
 847                 aCWmax = 1023;
 848                 if (use_11b)
 849                         aCWmin = 31;
 850                 else
 851                         aCWmin = 15;
 852
 853                 if (enable_qos) {
 854                         switch (ac) {
 855                         case IEEE80211_AC_BK:
 856                                 qparam.cw_max = aCWmax;
 857                                 qparam.cw_min = aCWmin;
 858                                 qparam.txop = 0;
 859                                 qparam.aifs = 7;
 860                                 break;
 861                         /* never happens but let's not leave undefined */
 862                         default:
 863                         case IEEE80211_AC_BE:
 864                                 qparam.cw_max = aCWmax;
 865                                 qparam.cw_min = aCWmin;
 866                                 qparam.txop = 0;
 867                                 qparam.aifs = 3;
 868                                 break;
 869                         case IEEE80211_AC_VI:
 870                                 qparam.cw_max = aCWmin;
 871                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 872                                 if (use_11b)
 873                                         qparam.txop = 6016/32;
 874                                 else
 875                                         qparam.txop = 3008/32;
 876                                 qparam.aifs = 2;
 877                                 break;
 878                         case IEEE80211_AC_VO:
 879                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 880                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 881                                 if (use_11b)
 882                                         qparam.txop = 3264/32;
 883                                 else
 884                                         qparam.txop = 1504/32;
 885                                 qparam.aifs = 2;
 886                                 break;
 887                         }
 888                 } else {
 889                         /* Confiure old 802.11b/g medium access rules. */
 890                         qparam.cw_max = aCWmax;
 891                         qparam.cw_min = aCWmin;
 892                         qparam.txop = 0;
 893                         qparam.aifs = 2;
 894                 }
 895
 896                 qparam.uapsd = false;
 897
 898                 sdata->tx_conf[ac] = qparam;
 899                 drv_conf_tx(local, sdata, ac, &qparam);
 900         }
 901
 902         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 903                 sdata->vif.bss_conf.qos = enable_qos;
 904                 if (bss_notify)
 905                         ieee80211_bss_info_change_notify(sdata,
 906                                                          BSS_CHANGED_QOS);
 907         }
 908 }
 909
 910 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 911                                   const size_t supp_rates_len,
 912                                   const u8 *supp_rates)
 913 {
 914         struct ieee80211_local *local = sdata->local;
 915         int i, have_higher_than_11mbit = 0;
 916
 917         /* cf. IEEE 802.11 9.2.12 */
 918         for (i = 0; i < supp_rates_len; i++)
 919                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 920                         have_higher_than_11mbit = 1;
 921
 922         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 923             have_higher_than_11mbit)
 924                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 925         else
 926                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 927
 928         ieee80211_set_wmm_default(sdata, true);
 929 }
 930
 931 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 932                               enum ieee80211_band band)
 933 {
 934         struct ieee80211_supported_band *sband;
 935         struct ieee80211_rate *bitrates;
 936         u32 mandatory_rates;
 937         enum ieee80211_rate_flags mandatory_flag;
 938         int i;
 939
 940         sband = local->hw.wiphy->bands[band];
 941         if (WARN_ON(!sband))
 942                 return 1;
 943
 944         if (band == IEEE80211_BAND_2GHZ)
 945                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 946         else
 947                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 948
 949         bitrates = sband->bitrates;
 950         mandatory_rates = 0;
 951         for (i = 0; i < sband->n_bitrates; i++)
 952                 if (bitrates[i].flags & mandatory_flag)
 953                         mandatory_rates |= BIT(i);
 954         return mandatory_rates;
 955 }
 956
 957 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 958                          u16 transaction, u16 auth_alg,
 959                          u8 *extra, size_t extra_len, const u8 *da,
 960                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 961 {
 962         struct ieee80211_local *local = sdata->local;
 963         struct sk_buff *skb;
 964         struct ieee80211_mgmt *mgmt;
 965         int err;
 966
 967         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 968                             sizeof(*mgmt) + 6 + extra_len);
 969         if (!skb)
 970                 return;
 971
 972         skb_reserve(skb, local->hw.extra_tx_headroom);
 973
 974         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 975         memset(mgmt, 0, 24 + 6);
 976         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 977                                           IEEE80211_STYPE_AUTH);
 978         memcpy(mgmt->da, da, ETH_ALEN);
 979         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 980         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 981         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 982         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 983         mgmt->u.auth.status_code = cpu_to_le16(0);
 984         if (extra)
 985                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 986
 987         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 988                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 989                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 990                 WARN_ON(err);
 991         }
 992
 993         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 994         ieee80211_tx_skb(sdata, skb);
 995 }
 996
 997 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 998                              const u8 *ie, size_t ie_len,
 999                              enum ieee80211_band band, u32 rate_mask,
1000                              u8 channel)
1001 {
1002         struct ieee80211_supported_band *sband;
1003         u8 *pos;
1004         size_t offset = 0, noffset;
1005         int supp_rates_len, i;
1006         u8 rates[32];
1007         int num_rates;
1008         int ext_rates_len;
1009
1010         sband = local->hw.wiphy->bands[band];
1011         if (WARN_ON_ONCE(!sband))
1012                 return 0;
1013
1014         pos = buffer;
1015
1016         num_rates = 0;
1017         for (i = 0; i < sband->n_bitrates; i++) {
1018                 if ((BIT(i) & rate_mask) == 0)
1019                         continue; /* skip rate */
1020                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1021         }
1022
1023         supp_rates_len = min_t(int, num_rates, 8);
1024
1025         *pos++ = WLAN_EID_SUPP_RATES;
1026         *pos++ = supp_rates_len;
1027         memcpy(pos, rates, supp_rates_len);
1028         pos += supp_rates_len;
1029
1030         /* insert "request information" if in custom IEs */
1031         if (ie && ie_len) {
1032                 static const u8 before_extrates[] = {
1033                         WLAN_EID_SSID,
1034                         WLAN_EID_SUPP_RATES,
1035                         WLAN_EID_REQUEST,
1036                 };
1037                 noffset = ieee80211_ie_split(ie, ie_len,
1038                                              before_extrates,
1039                                              ARRAY_SIZE(before_extrates),
1040                                              offset);
1041                 memcpy(pos, ie + offset, noffset - offset);
1042                 pos += noffset - offset;
1043                 offset = noffset;
1044         }
1045
1046         ext_rates_len = num_rates - supp_rates_len;
1047         if (ext_rates_len > 0) {
1048                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1049                 *pos++ = ext_rates_len;
1050                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1051                 pos += ext_rates_len;
1052         }
1053
1054         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1055                 *pos++ = WLAN_EID_DS_PARAMS;
1056                 *pos++ = 1;
1057                 *pos++ = channel;
1058         }
1059
1060         /* insert custom IEs that go before HT */
1061         if (ie && ie_len) {
1062                 static const u8 before_ht[] = {
1063                         WLAN_EID_SSID,
1064                         WLAN_EID_SUPP_RATES,
1065                         WLAN_EID_REQUEST,
1066                         WLAN_EID_EXT_SUPP_RATES,
1067                         WLAN_EID_DS_PARAMS,
1068                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1069                 };
1070                 noffset = ieee80211_ie_split(ie, ie_len,
1071                                              before_ht, ARRAY_SIZE(before_ht),
1072                                              offset);
1073                 memcpy(pos, ie + offset, noffset - offset);
1074                 pos += noffset - offset;
1075                 offset = noffset;
1076         }
1077
1078         if (sband->ht_cap.ht_supported)
1079                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1080                                                 sband->ht_cap.cap);
1081
1082         /*
1083          * If adding more here, adjust code in main.c
1084          * that calculates local->scan_ies_len.
1085          */
1086
1087         /* add any remaining custom IEs */
1088         if (ie && ie_len) {
1089                 noffset = ie_len;
1090                 memcpy(pos, ie + offset, noffset - offset);
1091                 pos += noffset - offset;
1092         }
1093
1094         if (sband->vht_cap.vht_supported)
1095                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1096                                                  sband->vht_cap.cap);
1097
1098         return pos - buffer;
1099 }
1100
1101 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1102                                           u8 *dst, u32 ratemask,
1103                                           const u8 *ssid, size_t ssid_len,
1104                                           const u8 *ie, size_t ie_len,
1105                                           bool directed)
1106 {
1107         struct ieee80211_local *local = sdata->local;
1108         struct sk_buff *skb;
1109         struct ieee80211_mgmt *mgmt;
1110         size_t buf_len;
1111         u8 *buf;
1112         u8 chan;
1113
1114         /* FIXME: come up with a proper value */
1115         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1116         if (!buf)
1117                 return NULL;
1118
1119         /*
1120          * Do not send DS Channel parameter for directed probe requests
1121          * in order to maximize the chance that we get a response.  Some
1122          * badly-behaved APs don't respond when this parameter is included.
1123          */
1124         if (directed)
1125                 chan = 0;
1126         else
1127                 chan = ieee80211_frequency_to_channel(
1128                         local->hw.conf.channel->center_freq);
1129
1130         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1131                                            local->hw.conf.channel->band,
1132                                            ratemask, chan);
1133
1134         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1135                                      ssid, ssid_len,
1136                                      buf, buf_len);
1137         if (!skb)
1138                 goto out;
1139
1140         if (dst) {
1141                 mgmt = (struct ieee80211_mgmt *) skb->data;
1142                 memcpy(mgmt->da, dst, ETH_ALEN);
1143                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1144         }
1145
1146         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1147
1148  out:
1149         kfree(buf);
1150
1151         return skb;
1152 }
1153
1154 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1155                               const u8 *ssid, size_t ssid_len,
1156                               const u8 *ie, size_t ie_len,
1157                               u32 ratemask, bool directed, bool no_cck)
1158 {
1159         struct sk_buff *skb;
1160
1161         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1162                                         ie, ie_len, directed);
1163         if (skb) {
1164                 if (no_cck)
1165                         IEEE80211_SKB_CB(skb)->flags |=
1166                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1167                 ieee80211_tx_skb(sdata, skb);
1168         }
1169 }
1170
1171 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1172                             struct ieee802_11_elems *elems,
1173                             enum ieee80211_band band, u32 *basic_rates)
1174 {
1175         struct ieee80211_supported_band *sband;
1176         struct ieee80211_rate *bitrates;
1177         size_t num_rates;
1178         u32 supp_rates;
1179         int i, j;
1180         sband = local->hw.wiphy->bands[band];
1181
1182         if (WARN_ON(!sband))
1183                 return 1;
1184
1185         bitrates = sband->bitrates;
1186         num_rates = sband->n_bitrates;
1187         supp_rates = 0;
1188         for (i = 0; i < elems->supp_rates_len +
1189                      elems->ext_supp_rates_len; i++) {
1190                 u8 rate = 0;
1191                 int own_rate;
1192                 bool is_basic;
1193                 if (i < elems->supp_rates_len)
1194                         rate = elems->supp_rates[i];
1195                 else if (elems->ext_supp_rates)
1196                         rate = elems->ext_supp_rates
1197                                 [i - elems->supp_rates_len];
1198                 own_rate = 5 * (rate & 0x7f);
1199                 is_basic = !!(rate & 0x80);
1200
1201                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1202                         continue;
1203
1204                 for (j = 0; j < num_rates; j++) {
1205                         if (bitrates[j].bitrate == own_rate) {
1206                                 supp_rates |= BIT(j);
1207                                 if (basic_rates && is_basic)
1208                                         *basic_rates |= BIT(j);
1209                         }
1210                 }
1211         }
1212         return supp_rates;
1213 }
1214
1215 void ieee80211_stop_device(struct ieee80211_local *local)
1216 {
1217         ieee80211_led_radio(local, false);
1218         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1219
1220         cancel_work_sync(&local->reconfig_filter);
1221
1222         flush_workqueue(local->workqueue);
1223         drv_stop(local);
1224 }
1225
1226 int ieee80211_reconfig(struct ieee80211_local *local)
1227 {
1228         struct ieee80211_hw *hw = &local->hw;
1229         struct ieee80211_sub_if_data *sdata;
1230         struct sta_info *sta;
1231         int res, i;
1232
1233 #ifdef CONFIG_PM
1234         if (local->suspended)
1235                 local->resuming = true;
1236
1237         if (local->wowlan) {
1238                 local->wowlan = false;
1239                 res = drv_resume(local);
1240                 if (res < 0) {
1241                         local->resuming = false;
1242                         return res;
1243                 }
1244                 if (res == 0)
1245                         goto wake_up;
1246                 WARN_ON(res > 1);
1247                 /*
1248                  * res is 1, which means the driver requested
1249                  * to go through a regular reset on wakeup.
1250                  */
1251         }
1252 #endif
1253         /* everything else happens only if HW was up & running */
1254         if (!local->open_count)
1255                 goto wake_up;
1256
1257         /*
1258          * Upon resume hardware can sometimes be goofy due to
1259          * various platform / driver / bus issues, so restarting
1260          * the device may at times not work immediately. Propagate
1261          * the error.
1262          */
1263         res = drv_start(local);
1264         if (res) {
1265                 WARN(local->suspended, "Hardware became unavailable "
1266                      "upon resume. This could be a software issue "
1267                      "prior to suspend or a hardware issue.\n");
1268                 return res;
1269         }
1270
1271         /* setup fragmentation threshold */
1272         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1273
1274         /* setup RTS threshold */
1275         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1276
1277         /* reset coverage class */
1278         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1279
1280         ieee80211_led_radio(local, true);
1281         ieee80211_mod_tpt_led_trig(local,
1282                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1283
1284         /* add interfaces */
1285         sdata = rtnl_dereference(local->monitor_sdata);
1286         if (sdata) {
1287                 res = drv_add_interface(local, sdata);
1288                 if (WARN_ON(res)) {
1289                         rcu_assign_pointer(local->monitor_sdata, NULL);
1290                         synchronize_net();
1291                         kfree(sdata);
1292                 }
1293         }
1294
1295         list_for_each_entry(sdata, &local->interfaces, list) {
1296                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1297                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1298                     ieee80211_sdata_running(sdata))
1299                         res = drv_add_interface(local, sdata);
1300         }
1301
1302         /* add STAs back */
1303         mutex_lock(&local->sta_mtx);
1304         list_for_each_entry(sta, &local->sta_list, list) {
1305                 enum ieee80211_sta_state state;
1306
1307                 if (!sta->uploaded)
1308                         continue;
1309
1310                 /* AP-mode stations will be added later */
1311                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1312                         continue;
1313
1314                 for (state = IEEE80211_STA_NOTEXIST;
1315                      state < sta->sta_state; state++)
1316                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1317                                               state + 1));
1318         }
1319         mutex_unlock(&local->sta_mtx);
1320
1321         /* reconfigure tx conf */
1322         if (hw->queues >= IEEE80211_NUM_ACS) {
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                                 continue;
1328
1329                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1330                                 drv_conf_tx(local, sdata, i,
1331                                             &sdata->tx_conf[i]);
1332                 }
1333         }
1334
1335         /* reconfigure hardware */
1336         ieee80211_hw_config(local, ~0);
1337
1338         ieee80211_configure_filter(local);
1339
1340         /* Finally also reconfigure all the BSS information */
1341         list_for_each_entry(sdata, &local->interfaces, list) {
1342                 u32 changed;
1343
1344                 if (!ieee80211_sdata_running(sdata))
1345                         continue;
1346
1347                 /* common change flags for all interface types */
1348                 changed = BSS_CHANGED_ERP_CTS_PROT |
1349                           BSS_CHANGED_ERP_PREAMBLE |
1350                           BSS_CHANGED_ERP_SLOT |
1351                           BSS_CHANGED_HT |
1352                           BSS_CHANGED_BASIC_RATES |
1353                           BSS_CHANGED_BEACON_INT |
1354                           BSS_CHANGED_BSSID |
1355                           BSS_CHANGED_CQM |
1356                           BSS_CHANGED_QOS |
1357                           BSS_CHANGED_IDLE;
1358
1359                 switch (sdata->vif.type) {
1360                 case NL80211_IFTYPE_STATION:
1361                         changed |= BSS_CHANGED_ASSOC |
1362                                    BSS_CHANGED_ARP_FILTER;
1363                         mutex_lock(&sdata->u.mgd.mtx);
1364                         ieee80211_bss_info_change_notify(sdata, changed);
1365                         mutex_unlock(&sdata->u.mgd.mtx);
1366                         break;
1367                 case NL80211_IFTYPE_ADHOC:
1368                         changed |= BSS_CHANGED_IBSS;
1369                         /* fall through */
1370                 case NL80211_IFTYPE_AP:
1371                         changed |= BSS_CHANGED_SSID;
1372
1373                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1374                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1375
1376                         /* fall through */
1377                 case NL80211_IFTYPE_MESH_POINT:
1378                         changed |= BSS_CHANGED_BEACON |
1379                                    BSS_CHANGED_BEACON_ENABLED;
1380                         ieee80211_bss_info_change_notify(sdata, changed);
1381                         break;
1382                 case NL80211_IFTYPE_WDS:
1383                         break;
1384                 case NL80211_IFTYPE_AP_VLAN:
1385                 case NL80211_IFTYPE_MONITOR:
1386                         /* ignore virtual */
1387                         break;
1388                 case NL80211_IFTYPE_UNSPECIFIED:
1389                 case NUM_NL80211_IFTYPES:
1390                 case NL80211_IFTYPE_P2P_CLIENT:
1391                 case NL80211_IFTYPE_P2P_GO:
1392                         WARN_ON(1);
1393                         break;
1394                 }
1395         }
1396
1397         ieee80211_recalc_ps(local, -1);
1398
1399         /*
1400          * The sta might be in psm against the ap (e.g. because
1401          * this was the state before a hw restart), so we
1402          * explicitly send a null packet in order to make sure
1403          * it'll sync against the ap (and get out of psm).
1404          */
1405         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1406                 list_for_each_entry(sdata, &local->interfaces, list) {
1407                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1408                                 continue;
1409
1410                         ieee80211_send_nullfunc(local, sdata, 0);
1411                 }
1412         }
1413
1414         /* APs are now beaconing, add back stations */
1415         mutex_lock(&local->sta_mtx);
1416         list_for_each_entry(sta, &local->sta_list, list) {
1417                 enum ieee80211_sta_state state;
1418
1419                 if (!sta->uploaded)
1420                         continue;
1421
1422                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1423                         continue;
1424
1425                 for (state = IEEE80211_STA_NOTEXIST;
1426                      state < sta->sta_state; state++)
1427                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1428                                               state + 1));
1429         }
1430         mutex_unlock(&local->sta_mtx);
1431
1432         /* add back keys */
1433         list_for_each_entry(sdata, &local->interfaces, list)
1434                 if (ieee80211_sdata_running(sdata))
1435                         ieee80211_enable_keys(sdata);
1436
1437  wake_up:
1438         local->in_reconfig = false;
1439         barrier();
1440
1441         /*
1442          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1443          * sessions can be established after a resume.
1444          *
1445          * Also tear down aggregation sessions since reconfiguring
1446          * them in a hardware restart scenario is not easily done
1447          * right now, and the hardware will have lost information
1448          * about the sessions, but we and the AP still think they
1449          * are active. This is really a workaround though.
1450          */
1451         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1452                 mutex_lock(&local->sta_mtx);
1453
1454                 list_for_each_entry(sta, &local->sta_list, list) {
1455                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1456                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1457                 }
1458
1459                 mutex_unlock(&local->sta_mtx);
1460         }
1461
1462         ieee80211_wake_queues_by_reason(hw,
1463                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1464
1465         /*
1466          * If this is for hw restart things are still running.
1467          * We may want to change that later, however.
1468          */
1469         if (!local->suspended)
1470                 return 0;
1471
1472 #ifdef CONFIG_PM
1473         /* first set suspended false, then resuming */
1474         local->suspended = false;
1475         mb();
1476         local->resuming = false;
1477
1478         list_for_each_entry(sdata, &local->interfaces, list) {
1479                 switch(sdata->vif.type) {
1480                 case NL80211_IFTYPE_STATION:
1481                         ieee80211_sta_restart(sdata);
1482                         break;
1483                 case NL80211_IFTYPE_ADHOC:
1484                         ieee80211_ibss_restart(sdata);
1485                         break;
1486                 case NL80211_IFTYPE_MESH_POINT:
1487                         ieee80211_mesh_restart(sdata);
1488                         break;
1489                 default:
1490                         break;
1491                 }
1492         }
1493
1494         mod_timer(&local->sta_cleanup, jiffies + 1);
1495
1496         mutex_lock(&local->sta_mtx);
1497         list_for_each_entry(sta, &local->sta_list, list)
1498                 mesh_plink_restart(sta);
1499         mutex_unlock(&local->sta_mtx);
1500 #else
1501         WARN_ON(1);
1502 #endif
1503         return 0;
1504 }
1505
1506 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1507 {
1508         struct ieee80211_sub_if_data *sdata;
1509         struct ieee80211_local *local;
1510         struct ieee80211_key *key;
1511
1512         if (WARN_ON(!vif))
1513                 return;
1514
1515         sdata = vif_to_sdata(vif);
1516         local = sdata->local;
1517
1518         if (WARN_ON(!local->resuming))
1519                 return;
1520
1521         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1522                 return;
1523
1524         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1525
1526         mutex_lock(&local->key_mtx);
1527         list_for_each_entry(key, &sdata->key_list, list)
1528                 key->flags |= KEY_FLAG_TAINTED;
1529         mutex_unlock(&local->key_mtx);
1530 }
1531 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1532
1533 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1534                           enum ieee80211_smps_mode *smps_mode)
1535 {
1536         if (ifmgd->associated) {
1537                 *smps_mode = ifmgd->ap_smps;
1538
1539                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1540                         if (ifmgd->powersave)
1541                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1542                         else
1543                                 *smps_mode = IEEE80211_SMPS_OFF;
1544                 }
1545
1546                 return 1;
1547         }
1548
1549         return 0;
1550 }
1551
1552 /* must hold iflist_mtx */
1553 void ieee80211_recalc_smps(struct ieee80211_local *local)
1554 {
1555         struct ieee80211_sub_if_data *sdata;
1556         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1557         int count = 0;
1558
1559         lockdep_assert_held(&local->iflist_mtx);
1560
1561         /*
1562          * This function could be improved to handle multiple
1563          * interfaces better, but right now it makes any
1564          * non-station interfaces force SM PS to be turned
1565          * off. If there are multiple station interfaces it
1566          * could also use the best possible mode, e.g. if
1567          * one is in static and the other in dynamic then
1568          * dynamic is ok.
1569          */
1570
1571         list_for_each_entry(sdata, &local->interfaces, list) {
1572                 if (!ieee80211_sdata_running(sdata))
1573                         continue;
1574                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1575                         goto set;
1576
1577                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1578
1579                 if (count > 1) {
1580                         smps_mode = IEEE80211_SMPS_OFF;
1581                         break;
1582                 }
1583         }
1584
1585         if (smps_mode == local->smps_mode)
1586                 return;
1587
1588  set:
1589         local->smps_mode = smps_mode;
1590         /* changed flag is auto-detected for this */
1591         ieee80211_hw_config(local, 0);
1592 }
1593
1594 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1595 {
1596         int i;
1597
1598         for (i = 0; i < n_ids; i++)
1599                 if (ids[i] == id)
1600                         return true;
1601         return false;
1602 }
1603
1604 /**
1605  * ieee80211_ie_split - split an IE buffer according to ordering
1606  *
1607  * @ies: the IE buffer
1608  * @ielen: the length of the IE buffer
1609  * @ids: an array with element IDs that are allowed before
1610  *      the split
1611  * @n_ids: the size of the element ID array
1612  * @offset: offset where to start splitting in the buffer
1613  *
1614  * This function splits an IE buffer by updating the @offset
1615  * variable to point to the location where the buffer should be
1616  * split.
1617  *
1618  * It assumes that the given IE buffer is well-formed, this
1619  * has to be guaranteed by the caller!
1620  *
1621  * It also assumes that the IEs in the buffer are ordered
1622  * correctly, if not the result of using this function will not
1623  * be ordered correctly either, i.e. it does no reordering.
1624  *
1625  * The function returns the offset where the next part of the
1626  * buffer starts, which may be @ielen if the entire (remainder)
1627  * of the buffer should be used.
1628  */
1629 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1630                           const u8 *ids, int n_ids, size_t offset)
1631 {
1632         size_t pos = offset;
1633
1634         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1635                 pos += 2 + ies[pos + 1];
1636
1637         return pos;
1638 }
1639
1640 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1641 {
1642         size_t pos = offset;
1643
1644         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1645                 pos += 2 + ies[pos + 1];
1646
1647         return pos;
1648 }
1649
1650 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1651                                             int rssi_min_thold,
1652                                             int rssi_max_thold)
1653 {
1654         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1655
1656         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1657                 return;
1658
1659         /*
1660          * Scale up threshold values before storing it, as the RSSI averaging
1661          * algorithm uses a scaled up value as well. Change this scaling
1662          * factor if the RSSI averaging algorithm changes.
1663          */
1664         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1665         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1666 }
1667
1668 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1669                                     int rssi_min_thold,
1670                                     int rssi_max_thold)
1671 {
1672         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1673
1674         WARN_ON(rssi_min_thold == rssi_max_thold ||
1675                 rssi_min_thold > rssi_max_thold);
1676
1677         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1678                                        rssi_max_thold);
1679 }
1680 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1681
1682 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1683 {
1684         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1685
1686         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1687 }
1688 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1689
1690 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1691                               u16 cap)
1692 {
1693         __le16 tmp;
1694
1695         *pos++ = WLAN_EID_HT_CAPABILITY;
1696         *pos++ = sizeof(struct ieee80211_ht_cap);
1697         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1698
1699         /* capability flags */
1700         tmp = cpu_to_le16(cap);
1701         memcpy(pos, &tmp, sizeof(u16));
1702         pos += sizeof(u16);
1703
1704         /* AMPDU parameters */
1705         *pos++ = ht_cap->ampdu_factor |
1706                  (ht_cap->ampdu_density <<
1707                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1708
1709         /* MCS set */
1710         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1711         pos += sizeof(ht_cap->mcs);
1712
1713         /* extended capabilities */
1714         pos += sizeof(__le16);
1715
1716         /* BF capabilities */
1717         pos += sizeof(__le32);
1718
1719         /* antenna selection */
1720         pos += sizeof(u8);
1721
1722         return pos;
1723 }
1724
1725 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1726                                                            u32 cap)
1727 {
1728         __le32 tmp;
1729
1730         *pos++ = WLAN_EID_VHT_CAPABILITY;
1731         *pos++ = sizeof(struct ieee80211_vht_capabilities);
1732         memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1733
1734         /* capability flags */
1735         tmp = cpu_to_le32(cap);
1736         memcpy(pos, &tmp, sizeof(u32));
1737         pos += sizeof(u32);
1738
1739         /* VHT MCS set */
1740         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1741         pos += sizeof(vht_cap->vht_mcs);
1742
1743         return pos;
1744 }
1745
1746 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1747                                struct ieee80211_channel *channel,
1748                                enum nl80211_channel_type channel_type,
1749                                u16 prot_mode)
1750 {
1751         struct ieee80211_ht_operation *ht_oper;
1752         /* Build HT Information */
1753         *pos++ = WLAN_EID_HT_OPERATION;
1754         *pos++ = sizeof(struct ieee80211_ht_operation);
1755         ht_oper = (struct ieee80211_ht_operation *)pos;
1756         ht_oper->primary_chan =
1757                         ieee80211_frequency_to_channel(channel->center_freq);
1758         switch (channel_type) {
1759         case NL80211_CHAN_HT40MINUS:
1760                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1761                 break;
1762         case NL80211_CHAN_HT40PLUS:
1763                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1764                 break;
1765         case NL80211_CHAN_HT20:
1766         default:
1767                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1768                 break;
1769         }
1770         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1771             channel_type != NL80211_CHAN_NO_HT &&
1772             channel_type != NL80211_CHAN_HT20)
1773                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1774
1775         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1776         ht_oper->stbc_param = 0x0000;
1777
1778         /* It seems that Basic MCS set and Supported MCS set
1779            are identical for the first 10 bytes */
1780         memset(&ht_oper->basic_set, 0, 16);
1781         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1782
1783         return pos + sizeof(struct ieee80211_ht_operation);
1784 }
1785
1786 enum nl80211_channel_type
1787 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1788 {
1789         enum nl80211_channel_type channel_type;
1790
1791         if (!ht_oper)
1792                 return NL80211_CHAN_NO_HT;
1793
1794         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1795         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1796                 channel_type = NL80211_CHAN_HT20;
1797                 break;
1798         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1799                 channel_type = NL80211_CHAN_HT40PLUS;
1800                 break;
1801         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1802                 channel_type = NL80211_CHAN_HT40MINUS;
1803                 break;
1804         default:
1805                 channel_type = NL80211_CHAN_NO_HT;
1806         }
1807
1808         return channel_type;
1809 }
1810
1811 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1812                             struct sk_buff *skb, bool need_basic)
1813 {
1814         struct ieee80211_local *local = sdata->local;
1815         struct ieee80211_supported_band *sband;
1816         int rate;
1817         u8 i, rates, *pos;
1818         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1819
1820         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1821         rates = sband->n_bitrates;
1822         if (rates > 8)
1823                 rates = 8;
1824
1825         if (skb_tailroom(skb) < rates + 2)
1826                 return -ENOMEM;
1827
1828         pos = skb_put(skb, rates + 2);
1829         *pos++ = WLAN_EID_SUPP_RATES;
1830         *pos++ = rates;
1831         for (i = 0; i < rates; i++) {
1832                 u8 basic = 0;
1833                 if (need_basic && basic_rates & BIT(i))
1834                         basic = 0x80;
1835                 rate = sband->bitrates[i].bitrate;
1836                 *pos++ = basic | (u8) (rate / 5);
1837         }
1838
1839         return 0;
1840 }
1841
1842 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1843                                 struct sk_buff *skb, bool need_basic)
1844 {
1845         struct ieee80211_local *local = sdata->local;
1846         struct ieee80211_supported_band *sband;
1847         int rate;
1848         u8 i, exrates, *pos;
1849         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1850
1851         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1852         exrates = sband->n_bitrates;
1853         if (exrates > 8)
1854                 exrates -= 8;
1855         else
1856                 exrates = 0;
1857
1858         if (skb_tailroom(skb) < exrates + 2)
1859                 return -ENOMEM;
1860
1861         if (exrates) {
1862                 pos = skb_put(skb, exrates + 2);
1863                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1864                 *pos++ = exrates;
1865                 for (i = 8; i < sband->n_bitrates; i++) {
1866                         u8 basic = 0;
1867                         if (need_basic && basic_rates & BIT(i))
1868                                 basic = 0x80;
1869                         rate = sband->bitrates[i].bitrate;
1870                         *pos++ = basic | (u8) (rate / 5);
1871                 }
1872         }
1873         return 0;
1874 }
1875
1876 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1877 {
1878         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1879         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1880
1881         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1882                 /* non-managed type inferfaces */
1883                 return 0;
1884         }
1885         return ifmgd->ave_beacon_signal;
1886 }
1887 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);