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 (!sdata->dev)
 280                         continue;
 281
 282                 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 283                         continue;
 284
 285                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 286                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 287                         continue;
 288
 289                 for (ac = 0; ac < n_acs; ac++) {
 290                         int ac_queue = sdata->vif.hw_queue[ac];
 291
 292                         if (ac_queue == queue ||
 293                             (sdata->vif.cab_queue == queue &&
 294                              local->queue_stop_reasons[ac_queue] == 0 &&
 295                              skb_queue_empty(&local->pending[ac_queue])))
 296                                 netif_wake_subqueue(sdata->dev, ac);
 297                 }
 298         }
 299 }
 300
 301 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 302                                    enum queue_stop_reason reason)
 303 {
 304         struct ieee80211_local *local = hw_to_local(hw);
 305
 306         trace_wake_queue(local, queue, reason);
 307
 308         if (WARN_ON(queue >= hw->queues))
 309                 return;
 310
 311         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 312                 return;
 313
 314         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 315
 316         if (local->queue_stop_reasons[queue] != 0)
 317                 /* someone still has this queue stopped */
 318                 return;
 319
 320         if (skb_queue_empty(&local->pending[queue])) {
 321                 rcu_read_lock();
 322                 ieee80211_propagate_queue_wake(local, queue);
 323                 rcu_read_unlock();
 324         } else
 325                 tasklet_schedule(&local->tx_pending_tasklet);
 326 }
 327
 328 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 329                                     enum queue_stop_reason reason)
 330 {
 331         struct ieee80211_local *local = hw_to_local(hw);
 332         unsigned long flags;
 333
 334         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 335         __ieee80211_wake_queue(hw, queue, reason);
 336         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 337 }
 338
 339 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 340 {
 341         ieee80211_wake_queue_by_reason(hw, queue,
 342                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 343 }
 344 EXPORT_SYMBOL(ieee80211_wake_queue);
 345
 346 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 347                                    enum queue_stop_reason reason)
 348 {
 349         struct ieee80211_local *local = hw_to_local(hw);
 350         struct ieee80211_sub_if_data *sdata;
 351         int n_acs = IEEE80211_NUM_ACS;
 352
 353         trace_stop_queue(local, queue, reason);
 354
 355         if (WARN_ON(queue >= hw->queues))
 356                 return;
 357
 358         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 359                 return;
 360
 361         __set_bit(reason, &local->queue_stop_reasons[queue]);
 362
 363         if (local->hw.queues < IEEE80211_NUM_ACS)
 364                 n_acs = 1;
 365
 366         rcu_read_lock();
 367         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 368                 int ac;
 369
 370                 if (!sdata->dev)
 371                         continue;
 372
 373                 for (ac = 0; ac < n_acs; ac++) {
 374                         if (sdata->vif.hw_queue[ac] == queue ||
 375                             sdata->vif.cab_queue == queue)
 376                                 netif_stop_subqueue(sdata->dev, ac);
 377                 }
 378         }
 379         rcu_read_unlock();
 380 }
 381
 382 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 383                                     enum queue_stop_reason reason)
 384 {
 385         struct ieee80211_local *local = hw_to_local(hw);
 386         unsigned long flags;
 387
 388         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 389         __ieee80211_stop_queue(hw, queue, reason);
 390         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 391 }
 392
 393 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 394 {
 395         ieee80211_stop_queue_by_reason(hw, queue,
 396                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 397 }
 398 EXPORT_SYMBOL(ieee80211_stop_queue);
 399
 400 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 401                                struct sk_buff *skb)
 402 {
 403         struct ieee80211_hw *hw = &local->hw;
 404         unsigned long flags;
 405         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 406         int queue = info->hw_queue;
 407
 408         if (WARN_ON(!info->control.vif)) {
 409                 kfree_skb(skb);
 410                 return;
 411         }
 412
 413         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 414         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 415         __skb_queue_tail(&local->pending[queue], skb);
 416         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 417         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 418 }
 419
 420 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 421                                    struct sk_buff_head *skbs,
 422                                    void (*fn)(void *data), void *data)
 423 {
 424         struct ieee80211_hw *hw = &local->hw;
 425         struct sk_buff *skb;
 426         unsigned long flags;
 427         int queue, i;
 428
 429         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 430         while ((skb = skb_dequeue(skbs))) {
 431                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 432
 433                 if (WARN_ON(!info->control.vif)) {
 434                         kfree_skb(skb);
 435                         continue;
 436                 }
 437
 438                 queue = info->hw_queue;
 439
 440                 __ieee80211_stop_queue(hw, queue,
 441                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 442
 443                 __skb_queue_tail(&local->pending[queue], skb);
 444         }
 445
 446         if (fn)
 447                 fn(data);
 448
 449         for (i = 0; i < hw->queues; i++)
 450                 __ieee80211_wake_queue(hw, i,
 451                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 452         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 453 }
 454
 455 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 456                                     enum queue_stop_reason reason)
 457 {
 458         struct ieee80211_local *local = hw_to_local(hw);
 459         unsigned long flags;
 460         int i;
 461
 462         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 463
 464         for (i = 0; i < hw->queues; i++)
 465                 __ieee80211_stop_queue(hw, i, reason);
 466
 467         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 468 }
 469
 470 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 471 {
 472         ieee80211_stop_queues_by_reason(hw,
 473                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 474 }
 475 EXPORT_SYMBOL(ieee80211_stop_queues);
 476
 477 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 478 {
 479         struct ieee80211_local *local = hw_to_local(hw);
 480         unsigned long flags;
 481         int ret;
 482
 483         if (WARN_ON(queue >= hw->queues))
 484                 return true;
 485
 486         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 487         ret = !!local->queue_stop_reasons[queue];
 488         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 489         return ret;
 490 }
 491 EXPORT_SYMBOL(ieee80211_queue_stopped);
 492
 493 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 494                                      enum queue_stop_reason reason)
 495 {
 496         struct ieee80211_local *local = hw_to_local(hw);
 497         unsigned long flags;
 498         int i;
 499
 500         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 501
 502         for (i = 0; i < hw->queues; i++)
 503                 __ieee80211_wake_queue(hw, i, reason);
 504
 505         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 506 }
 507
 508 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 509 {
 510         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 511 }
 512 EXPORT_SYMBOL(ieee80211_wake_queues);
 513
 514 void ieee80211_iterate_active_interfaces(
 515         struct ieee80211_hw *hw,
 516         void (*iterator)(void *data, u8 *mac,
 517                          struct ieee80211_vif *vif),
 518         void *data)
 519 {
 520         struct ieee80211_local *local = hw_to_local(hw);
 521         struct ieee80211_sub_if_data *sdata;
 522
 523         mutex_lock(&local->iflist_mtx);
 524
 525         list_for_each_entry(sdata, &local->interfaces, list) {
 526                 switch (sdata->vif.type) {
 527                 case NL80211_IFTYPE_MONITOR:
 528                 case NL80211_IFTYPE_AP_VLAN:
 529                         continue;
 530                 default:
 531                         break;
 532                 }
 533                 if (ieee80211_sdata_running(sdata))
 534                         iterator(data, sdata->vif.addr,
 535                                  &sdata->vif);
 536         }
 537
 538         sdata = rcu_dereference_protected(local->monitor_sdata,
 539                                           lockdep_is_held(&local->iflist_mtx));
 540         if (sdata)
 541                 iterator(data, sdata->vif.addr, &sdata->vif);
 542
 543         mutex_unlock(&local->iflist_mtx);
 544 }
 545 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 546
 547 void ieee80211_iterate_active_interfaces_atomic(
 548         struct ieee80211_hw *hw,
 549         void (*iterator)(void *data, u8 *mac,
 550                          struct ieee80211_vif *vif),
 551         void *data)
 552 {
 553         struct ieee80211_local *local = hw_to_local(hw);
 554         struct ieee80211_sub_if_data *sdata;
 555
 556         rcu_read_lock();
 557
 558         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 559                 switch (sdata->vif.type) {
 560                 case NL80211_IFTYPE_MONITOR:
 561                 case NL80211_IFTYPE_AP_VLAN:
 562                         continue;
 563                 default:
 564                         break;
 565                 }
 566                 if (ieee80211_sdata_running(sdata))
 567                         iterator(data, sdata->vif.addr,
 568                                  &sdata->vif);
 569         }
 570
 571         sdata = rcu_dereference(local->monitor_sdata);
 572         if (sdata)
 573                 iterator(data, sdata->vif.addr, &sdata->vif);
 574
 575         rcu_read_unlock();
 576 }
 577 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 578
 579 /*
 580  * Nothing should have been stuffed into the workqueue during
 581  * the suspend->resume cycle. If this WARN is seen then there
 582  * is a bug with either the driver suspend or something in
 583  * mac80211 stuffing into the workqueue which we haven't yet
 584  * cleared during mac80211's suspend cycle.
 585  */
 586 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 587 {
 588         if (WARN(local->suspended && !local->resuming,
 589                  "queueing ieee80211 work while going to suspend\n"))
 590                 return false;
 591
 592         return true;
 593 }
 594
 595 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 596 {
 597         struct ieee80211_local *local = hw_to_local(hw);
 598
 599         if (!ieee80211_can_queue_work(local))
 600                 return;
 601
 602         queue_work(local->workqueue, work);
 603 }
 604 EXPORT_SYMBOL(ieee80211_queue_work);
 605
 606 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 607                                   struct delayed_work *dwork,
 608                                   unsigned long delay)
 609 {
 610         struct ieee80211_local *local = hw_to_local(hw);
 611
 612         if (!ieee80211_can_queue_work(local))
 613                 return;
 614
 615         queue_delayed_work(local->workqueue, dwork, delay);
 616 }
 617 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 618
 619 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 620                                struct ieee802_11_elems *elems,
 621                                u64 filter, u32 crc)
 622 {
 623         size_t left = len;
 624         u8 *pos = start;
 625         bool calc_crc = filter != 0;
 626         DECLARE_BITMAP(seen_elems, 256);
 627
 628         bitmap_zero(seen_elems, 256);
 629         memset(elems, 0, sizeof(*elems));
 630         elems->ie_start = start;
 631         elems->total_len = len;
 632
 633         while (left >= 2) {
 634                 u8 id, elen;
 635                 bool elem_parse_failed;
 636
 637                 id = *pos++;
 638                 elen = *pos++;
 639                 left -= 2;
 640
 641                 if (elen > left) {
 642                         elems->parse_error = true;
 643                         break;
 644                 }
 645
 646                 if (id != WLAN_EID_VENDOR_SPECIFIC &&
 647                     id != WLAN_EID_QUIET &&
 648                     test_bit(id, seen_elems)) {
 649                         elems->parse_error = true;
 650                         left -= elen;
 651                         pos += elen;
 652                         continue;
 653                 }
 654
 655                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 656                         crc = crc32_be(crc, pos - 2, elen + 2);
 657
 658                 elem_parse_failed = false;
 659
 660                 switch (id) {
 661                 case WLAN_EID_SSID:
 662                         elems->ssid = pos;
 663                         elems->ssid_len = elen;
 664                         break;
 665                 case WLAN_EID_SUPP_RATES:
 666                         elems->supp_rates = pos;
 667                         elems->supp_rates_len = elen;
 668                         break;
 669                 case WLAN_EID_FH_PARAMS:
 670                         elems->fh_params = pos;
 671                         elems->fh_params_len = elen;
 672                         break;
 673                 case WLAN_EID_DS_PARAMS:
 674                         elems->ds_params = pos;
 675                         elems->ds_params_len = elen;
 676                         break;
 677                 case WLAN_EID_CF_PARAMS:
 678                         elems->cf_params = pos;
 679                         elems->cf_params_len = elen;
 680                         break;
 681                 case WLAN_EID_TIM:
 682                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 683                                 elems->tim = (void *)pos;
 684                                 elems->tim_len = elen;
 685                         } else
 686                                 elem_parse_failed = true;
 687                         break;
 688                 case WLAN_EID_IBSS_PARAMS:
 689                         elems->ibss_params = pos;
 690                         elems->ibss_params_len = elen;
 691                         break;
 692                 case WLAN_EID_CHALLENGE:
 693                         elems->challenge = pos;
 694                         elems->challenge_len = elen;
 695                         break;
 696                 case WLAN_EID_VENDOR_SPECIFIC:
 697                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 698                             pos[2] == 0xf2) {
 699                                 /* Microsoft OUI (00:50:F2) */
 700
 701                                 if (calc_crc)
 702                                         crc = crc32_be(crc, pos - 2, elen + 2);
 703
 704                                 if (pos[3] == 1) {
 705                                         /* OUI Type 1 - WPA IE */
 706                                         elems->wpa = pos;
 707                                         elems->wpa_len = elen;
 708                                 } else if (elen >= 5 && pos[3] == 2) {
 709                                         /* OUI Type 2 - WMM IE */
 710                                         if (pos[4] == 0) {
 711                                                 elems->wmm_info = pos;
 712                                                 elems->wmm_info_len = elen;
 713                                         } else if (pos[4] == 1) {
 714                                                 elems->wmm_param = pos;
 715                                                 elems->wmm_param_len = elen;
 716                                         }
 717                                 }
 718                         }
 719                         break;
 720                 case WLAN_EID_RSN:
 721                         elems->rsn = pos;
 722                         elems->rsn_len = elen;
 723                         break;
 724                 case WLAN_EID_ERP_INFO:
 725                         elems->erp_info = pos;
 726                         elems->erp_info_len = elen;
 727                         break;
 728                 case WLAN_EID_EXT_SUPP_RATES:
 729                         elems->ext_supp_rates = pos;
 730                         elems->ext_supp_rates_len = elen;
 731                         break;
 732                 case WLAN_EID_HT_CAPABILITY:
 733                         if (elen >= sizeof(struct ieee80211_ht_cap))
 734                                 elems->ht_cap_elem = (void *)pos;
 735                         else
 736                                 elem_parse_failed = true;
 737                         break;
 738                 case WLAN_EID_HT_OPERATION:
 739                         if (elen >= sizeof(struct ieee80211_ht_operation))
 740                                 elems->ht_operation = (void *)pos;
 741                         else
 742                                 elem_parse_failed = true;
 743                         break;
 744                 case WLAN_EID_MESH_ID:
 745                         elems->mesh_id = pos;
 746                         elems->mesh_id_len = elen;
 747                         break;
 748                 case WLAN_EID_MESH_CONFIG:
 749                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 750                                 elems->mesh_config = (void *)pos;
 751                         else
 752                                 elem_parse_failed = true;
 753                         break;
 754                 case WLAN_EID_PEER_MGMT:
 755                         elems->peering = pos;
 756                         elems->peering_len = elen;
 757                         break;
 758                 case WLAN_EID_PREQ:
 759                         elems->preq = pos;
 760                         elems->preq_len = elen;
 761                         break;
 762                 case WLAN_EID_PREP:
 763                         elems->prep = pos;
 764                         elems->prep_len = elen;
 765                         break;
 766                 case WLAN_EID_PERR:
 767                         elems->perr = pos;
 768                         elems->perr_len = elen;
 769                         break;
 770                 case WLAN_EID_RANN:
 771                         if (elen >= sizeof(struct ieee80211_rann_ie))
 772                                 elems->rann = (void *)pos;
 773                         else
 774                                 elem_parse_failed = true;
 775                         break;
 776                 case WLAN_EID_CHANNEL_SWITCH:
 777                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 778                                 elem_parse_failed = true;
 779                                 break;
 780                         }
 781                         elems->ch_switch_ie = (void *)pos;
 782                         break;
 783                 case WLAN_EID_QUIET:
 784                         if (!elems->quiet_elem) {
 785                                 elems->quiet_elem = pos;
 786                                 elems->quiet_elem_len = elen;
 787                         }
 788                         elems->num_of_quiet_elem++;
 789                         break;
 790                 case WLAN_EID_COUNTRY:
 791                         elems->country_elem = pos;
 792                         elems->country_elem_len = elen;
 793                         break;
 794                 case WLAN_EID_PWR_CONSTRAINT:
 795                         elems->pwr_constr_elem = pos;
 796                         elems->pwr_constr_elem_len = elen;
 797                         break;
 798                 case WLAN_EID_TIMEOUT_INTERVAL:
 799                         elems->timeout_int = pos;
 800                         elems->timeout_int_len = elen;
 801                         break;
 802                 default:
 803                         break;
 804                 }
 805
 806                 if (elem_parse_failed)
 807                         elems->parse_error = true;
 808                 else
 809                         set_bit(id, seen_elems);
 810
 811                 left -= elen;
 812                 pos += elen;
 813         }
 814
 815         if (left != 0)
 816                 elems->parse_error = true;
 817
 818         return crc;
 819 }
 820
 821 void ieee802_11_parse_elems(u8 *start, size_t len,
 822                             struct ieee802_11_elems *elems)
 823 {
 824         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 825 }
 826
 827 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 828                                bool bss_notify)
 829 {
 830         struct ieee80211_local *local = sdata->local;
 831         struct ieee80211_tx_queue_params qparam;
 832         int ac;
 833         bool use_11b, enable_qos;
 834         int aCWmin, aCWmax;
 835
 836         if (!local->ops->conf_tx)
 837                 return;
 838
 839         if (local->hw.queues < IEEE80211_NUM_ACS)
 840                 return;
 841
 842         memset(&qparam, 0, sizeof(qparam));
 843
 844         use_11b = (local->oper_channel->band == IEEE80211_BAND_2GHZ) &&
 845                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 846
 847         /*
 848          * By default disable QoS in STA mode for old access points, which do
 849          * not support 802.11e. New APs will provide proper queue parameters,
 850          * that we will configure later.
 851          */
 852         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 853
 854         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 855                 /* Set defaults according to 802.11-2007 Table 7-37 */
 856                 aCWmax = 1023;
 857                 if (use_11b)
 858                         aCWmin = 31;
 859                 else
 860                         aCWmin = 15;
 861
 862                 if (enable_qos) {
 863                         switch (ac) {
 864                         case IEEE80211_AC_BK:
 865                                 qparam.cw_max = aCWmax;
 866                                 qparam.cw_min = aCWmin;
 867                                 qparam.txop = 0;
 868                                 qparam.aifs = 7;
 869                                 break;
 870                         /* never happens but let's not leave undefined */
 871                         default:
 872                         case IEEE80211_AC_BE:
 873                                 qparam.cw_max = aCWmax;
 874                                 qparam.cw_min = aCWmin;
 875                                 qparam.txop = 0;
 876                                 qparam.aifs = 3;
 877                                 break;
 878                         case IEEE80211_AC_VI:
 879                                 qparam.cw_max = aCWmin;
 880                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 881                                 if (use_11b)
 882                                         qparam.txop = 6016/32;
 883                                 else
 884                                         qparam.txop = 3008/32;
 885                                 qparam.aifs = 2;
 886                                 break;
 887                         case IEEE80211_AC_VO:
 888                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 889                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 890                                 if (use_11b)
 891                                         qparam.txop = 3264/32;
 892                                 else
 893                                         qparam.txop = 1504/32;
 894                                 qparam.aifs = 2;
 895                                 break;
 896                         }
 897                 } else {
 898                         /* Confiure old 802.11b/g medium access rules. */
 899                         qparam.cw_max = aCWmax;
 900                         qparam.cw_min = aCWmin;
 901                         qparam.txop = 0;
 902                         qparam.aifs = 2;
 903                 }
 904
 905                 qparam.uapsd = false;
 906
 907                 sdata->tx_conf[ac] = qparam;
 908                 drv_conf_tx(local, sdata, ac, &qparam);
 909         }
 910
 911         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 912             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 913                 sdata->vif.bss_conf.qos = enable_qos;
 914                 if (bss_notify)
 915                         ieee80211_bss_info_change_notify(sdata,
 916                                                          BSS_CHANGED_QOS);
 917         }
 918 }
 919
 920 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 921                                   const size_t supp_rates_len,
 922                                   const u8 *supp_rates)
 923 {
 924         struct ieee80211_local *local = sdata->local;
 925         int i, have_higher_than_11mbit = 0;
 926
 927         /* cf. IEEE 802.11 9.2.12 */
 928         for (i = 0; i < supp_rates_len; i++)
 929                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 930                         have_higher_than_11mbit = 1;
 931
 932         if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
 933             have_higher_than_11mbit)
 934                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 935         else
 936                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 937
 938         ieee80211_set_wmm_default(sdata, true);
 939 }
 940
 941 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 942                               enum ieee80211_band band)
 943 {
 944         struct ieee80211_supported_band *sband;
 945         struct ieee80211_rate *bitrates;
 946         u32 mandatory_rates;
 947         enum ieee80211_rate_flags mandatory_flag;
 948         int i;
 949
 950         sband = local->hw.wiphy->bands[band];
 951         if (WARN_ON(!sband))
 952                 return 1;
 953
 954         if (band == IEEE80211_BAND_2GHZ)
 955                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 956         else
 957                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 958
 959         bitrates = sband->bitrates;
 960         mandatory_rates = 0;
 961         for (i = 0; i < sband->n_bitrates; i++)
 962                 if (bitrates[i].flags & mandatory_flag)
 963                         mandatory_rates |= BIT(i);
 964         return mandatory_rates;
 965 }
 966
 967 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 968                          u16 transaction, u16 auth_alg,
 969                          u8 *extra, size_t extra_len, const u8 *da,
 970                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 971 {
 972         struct ieee80211_local *local = sdata->local;
 973         struct sk_buff *skb;
 974         struct ieee80211_mgmt *mgmt;
 975         int err;
 976
 977         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 978                             sizeof(*mgmt) + 6 + extra_len);
 979         if (!skb)
 980                 return;
 981
 982         skb_reserve(skb, local->hw.extra_tx_headroom);
 983
 984         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 985         memset(mgmt, 0, 24 + 6);
 986         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 987                                           IEEE80211_STYPE_AUTH);
 988         memcpy(mgmt->da, da, ETH_ALEN);
 989         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 990         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 991         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 992         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 993         mgmt->u.auth.status_code = cpu_to_le16(0);
 994         if (extra)
 995                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 996
 997         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 998                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 999                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1000                 WARN_ON(err);
1001         }
1002
1003         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1004         ieee80211_tx_skb(sdata, skb);
1005 }
1006
1007 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1008                              const u8 *ie, size_t ie_len,
1009                              enum ieee80211_band band, u32 rate_mask,
1010                              u8 channel)
1011 {
1012         struct ieee80211_supported_band *sband;
1013         u8 *pos;
1014         size_t offset = 0, noffset;
1015         int supp_rates_len, i;
1016         u8 rates[32];
1017         int num_rates;
1018         int ext_rates_len;
1019
1020         sband = local->hw.wiphy->bands[band];
1021         if (WARN_ON_ONCE(!sband))
1022                 return 0;
1023
1024         pos = buffer;
1025
1026         num_rates = 0;
1027         for (i = 0; i < sband->n_bitrates; i++) {
1028                 if ((BIT(i) & rate_mask) == 0)
1029                         continue; /* skip rate */
1030                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1031         }
1032
1033         supp_rates_len = min_t(int, num_rates, 8);
1034
1035         *pos++ = WLAN_EID_SUPP_RATES;
1036         *pos++ = supp_rates_len;
1037         memcpy(pos, rates, supp_rates_len);
1038         pos += supp_rates_len;
1039
1040         /* insert "request information" if in custom IEs */
1041         if (ie && ie_len) {
1042                 static const u8 before_extrates[] = {
1043                         WLAN_EID_SSID,
1044                         WLAN_EID_SUPP_RATES,
1045                         WLAN_EID_REQUEST,
1046                 };
1047                 noffset = ieee80211_ie_split(ie, ie_len,
1048                                              before_extrates,
1049                                              ARRAY_SIZE(before_extrates),
1050                                              offset);
1051                 memcpy(pos, ie + offset, noffset - offset);
1052                 pos += noffset - offset;
1053                 offset = noffset;
1054         }
1055
1056         ext_rates_len = num_rates - supp_rates_len;
1057         if (ext_rates_len > 0) {
1058                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1059                 *pos++ = ext_rates_len;
1060                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1061                 pos += ext_rates_len;
1062         }
1063
1064         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1065                 *pos++ = WLAN_EID_DS_PARAMS;
1066                 *pos++ = 1;
1067                 *pos++ = channel;
1068         }
1069
1070         /* insert custom IEs that go before HT */
1071         if (ie && ie_len) {
1072                 static const u8 before_ht[] = {
1073                         WLAN_EID_SSID,
1074                         WLAN_EID_SUPP_RATES,
1075                         WLAN_EID_REQUEST,
1076                         WLAN_EID_EXT_SUPP_RATES,
1077                         WLAN_EID_DS_PARAMS,
1078                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1079                 };
1080                 noffset = ieee80211_ie_split(ie, ie_len,
1081                                              before_ht, ARRAY_SIZE(before_ht),
1082                                              offset);
1083                 memcpy(pos, ie + offset, noffset - offset);
1084                 pos += noffset - offset;
1085                 offset = noffset;
1086         }
1087
1088         if (sband->ht_cap.ht_supported)
1089                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1090                                                 sband->ht_cap.cap);
1091
1092         /*
1093          * If adding more here, adjust code in main.c
1094          * that calculates local->scan_ies_len.
1095          */
1096
1097         /* add any remaining custom IEs */
1098         if (ie && ie_len) {
1099                 noffset = ie_len;
1100                 memcpy(pos, ie + offset, noffset - offset);
1101                 pos += noffset - offset;
1102         }
1103
1104         if (sband->vht_cap.vht_supported)
1105                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1106                                                  sband->vht_cap.cap);
1107
1108         return pos - buffer;
1109 }
1110
1111 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1112                                           u8 *dst, u32 ratemask,
1113                                           struct ieee80211_channel *chan,
1114                                           const u8 *ssid, size_t ssid_len,
1115                                           const u8 *ie, size_t ie_len,
1116                                           bool directed)
1117 {
1118         struct ieee80211_local *local = sdata->local;
1119         struct sk_buff *skb;
1120         struct ieee80211_mgmt *mgmt;
1121         size_t buf_len;
1122         u8 *buf;
1123         u8 chan_no;
1124
1125         /* FIXME: come up with a proper value */
1126         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1127         if (!buf)
1128                 return NULL;
1129
1130         /*
1131          * Do not send DS Channel parameter for directed probe requests
1132          * in order to maximize the chance that we get a response.  Some
1133          * badly-behaved APs don't respond when this parameter is included.
1134          */
1135         if (directed)
1136                 chan_no = 0;
1137         else
1138                 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1139
1140         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, chan->band,
1141                                            ratemask, chan_no);
1142
1143         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1144                                      ssid, ssid_len,
1145                                      buf, buf_len);
1146         if (!skb)
1147                 goto out;
1148
1149         if (dst) {
1150                 mgmt = (struct ieee80211_mgmt *) skb->data;
1151                 memcpy(mgmt->da, dst, ETH_ALEN);
1152                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1153         }
1154
1155         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1156
1157  out:
1158         kfree(buf);
1159
1160         return skb;
1161 }
1162
1163 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1164                               const u8 *ssid, size_t ssid_len,
1165                               const u8 *ie, size_t ie_len,
1166                               u32 ratemask, bool directed, bool no_cck,
1167                               struct ieee80211_channel *channel)
1168 {
1169         struct sk_buff *skb;
1170
1171         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1172                                         ssid, ssid_len,
1173                                         ie, ie_len, directed);
1174         if (skb) {
1175                 if (no_cck)
1176                         IEEE80211_SKB_CB(skb)->flags |=
1177                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1178                 ieee80211_tx_skb(sdata, skb);
1179         }
1180 }
1181
1182 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1183                             struct ieee802_11_elems *elems,
1184                             enum ieee80211_band band, u32 *basic_rates)
1185 {
1186         struct ieee80211_supported_band *sband;
1187         struct ieee80211_rate *bitrates;
1188         size_t num_rates;
1189         u32 supp_rates;
1190         int i, j;
1191         sband = local->hw.wiphy->bands[band];
1192
1193         if (WARN_ON(!sband))
1194                 return 1;
1195
1196         bitrates = sband->bitrates;
1197         num_rates = sband->n_bitrates;
1198         supp_rates = 0;
1199         for (i = 0; i < elems->supp_rates_len +
1200                      elems->ext_supp_rates_len; i++) {
1201                 u8 rate = 0;
1202                 int own_rate;
1203                 bool is_basic;
1204                 if (i < elems->supp_rates_len)
1205                         rate = elems->supp_rates[i];
1206                 else if (elems->ext_supp_rates)
1207                         rate = elems->ext_supp_rates
1208                                 [i - elems->supp_rates_len];
1209                 own_rate = 5 * (rate & 0x7f);
1210                 is_basic = !!(rate & 0x80);
1211
1212                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1213                         continue;
1214
1215                 for (j = 0; j < num_rates; j++) {
1216                         if (bitrates[j].bitrate == own_rate) {
1217                                 supp_rates |= BIT(j);
1218                                 if (basic_rates && is_basic)
1219                                         *basic_rates |= BIT(j);
1220                         }
1221                 }
1222         }
1223         return supp_rates;
1224 }
1225
1226 void ieee80211_stop_device(struct ieee80211_local *local)
1227 {
1228         ieee80211_led_radio(local, false);
1229         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1230
1231         cancel_work_sync(&local->reconfig_filter);
1232
1233         flush_workqueue(local->workqueue);
1234         drv_stop(local);
1235 }
1236
1237 int ieee80211_reconfig(struct ieee80211_local *local)
1238 {
1239         struct ieee80211_hw *hw = &local->hw;
1240         struct ieee80211_sub_if_data *sdata;
1241         struct sta_info *sta;
1242         int res, i;
1243
1244 #ifdef CONFIG_PM
1245         if (local->suspended)
1246                 local->resuming = true;
1247
1248         if (local->wowlan) {
1249                 local->wowlan = false;
1250                 res = drv_resume(local);
1251                 if (res < 0) {
1252                         local->resuming = false;
1253                         return res;
1254                 }
1255                 if (res == 0)
1256                         goto wake_up;
1257                 WARN_ON(res > 1);
1258                 /*
1259                  * res is 1, which means the driver requested
1260                  * to go through a regular reset on wakeup.
1261                  */
1262         }
1263 #endif
1264         /* everything else happens only if HW was up & running */
1265         if (!local->open_count)
1266                 goto wake_up;
1267
1268         /*
1269          * Upon resume hardware can sometimes be goofy due to
1270          * various platform / driver / bus issues, so restarting
1271          * the device may at times not work immediately. Propagate
1272          * the error.
1273          */
1274         res = drv_start(local);
1275         if (res) {
1276                 WARN(local->suspended, "Hardware became unavailable "
1277                      "upon resume. This could be a software issue "
1278                      "prior to suspend or a hardware issue.\n");
1279                 return res;
1280         }
1281
1282         /* setup fragmentation threshold */
1283         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1284
1285         /* setup RTS threshold */
1286         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1287
1288         /* reset coverage class */
1289         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1290
1291         ieee80211_led_radio(local, true);
1292         ieee80211_mod_tpt_led_trig(local,
1293                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1294
1295         /* add interfaces */
1296         sdata = rtnl_dereference(local->monitor_sdata);
1297         if (sdata) {
1298                 res = drv_add_interface(local, sdata);
1299                 if (WARN_ON(res)) {
1300                         rcu_assign_pointer(local->monitor_sdata, NULL);
1301                         synchronize_net();
1302                         kfree(sdata);
1303                 }
1304         }
1305
1306         list_for_each_entry(sdata, &local->interfaces, list) {
1307                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1308                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1309                     ieee80211_sdata_running(sdata))
1310                         res = drv_add_interface(local, sdata);
1311         }
1312
1313         /* add STAs back */
1314         mutex_lock(&local->sta_mtx);
1315         list_for_each_entry(sta, &local->sta_list, list) {
1316                 enum ieee80211_sta_state state;
1317
1318                 if (!sta->uploaded)
1319                         continue;
1320
1321                 /* AP-mode stations will be added later */
1322                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1323                         continue;
1324
1325                 for (state = IEEE80211_STA_NOTEXIST;
1326                      state < sta->sta_state; state++)
1327                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1328                                               state + 1));
1329         }
1330         mutex_unlock(&local->sta_mtx);
1331
1332         /* reconfigure tx conf */
1333         if (hw->queues >= IEEE80211_NUM_ACS) {
1334                 list_for_each_entry(sdata, &local->interfaces, list) {
1335                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1336                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1337                             !ieee80211_sdata_running(sdata))
1338                                 continue;
1339
1340                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1341                                 drv_conf_tx(local, sdata, i,
1342                                             &sdata->tx_conf[i]);
1343                 }
1344         }
1345
1346         /* reconfigure hardware */
1347         ieee80211_hw_config(local, ~0);
1348
1349         ieee80211_configure_filter(local);
1350
1351         /* Finally also reconfigure all the BSS information */
1352         list_for_each_entry(sdata, &local->interfaces, list) {
1353                 u32 changed;
1354
1355                 if (!ieee80211_sdata_running(sdata))
1356                         continue;
1357
1358                 /* common change flags for all interface types */
1359                 changed = BSS_CHANGED_ERP_CTS_PROT |
1360                           BSS_CHANGED_ERP_PREAMBLE |
1361                           BSS_CHANGED_ERP_SLOT |
1362                           BSS_CHANGED_HT |
1363                           BSS_CHANGED_BASIC_RATES |
1364                           BSS_CHANGED_BEACON_INT |
1365                           BSS_CHANGED_BSSID |
1366                           BSS_CHANGED_CQM |
1367                           BSS_CHANGED_QOS |
1368                           BSS_CHANGED_IDLE;
1369
1370                 switch (sdata->vif.type) {
1371                 case NL80211_IFTYPE_STATION:
1372                         changed |= BSS_CHANGED_ASSOC |
1373                                    BSS_CHANGED_ARP_FILTER |
1374                                    BSS_CHANGED_PS;
1375                         mutex_lock(&sdata->u.mgd.mtx);
1376                         ieee80211_bss_info_change_notify(sdata, changed);
1377                         mutex_unlock(&sdata->u.mgd.mtx);
1378                         break;
1379                 case NL80211_IFTYPE_ADHOC:
1380                         changed |= BSS_CHANGED_IBSS;
1381                         /* fall through */
1382                 case NL80211_IFTYPE_AP:
1383                         changed |= BSS_CHANGED_SSID;
1384
1385                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1386                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1387
1388                         /* fall through */
1389                 case NL80211_IFTYPE_MESH_POINT:
1390                         changed |= BSS_CHANGED_BEACON |
1391                                    BSS_CHANGED_BEACON_ENABLED;
1392                         ieee80211_bss_info_change_notify(sdata, changed);
1393                         break;
1394                 case NL80211_IFTYPE_WDS:
1395                         break;
1396                 case NL80211_IFTYPE_AP_VLAN:
1397                 case NL80211_IFTYPE_MONITOR:
1398                         /* ignore virtual */
1399                         break;
1400                 case NL80211_IFTYPE_P2P_DEVICE:
1401                         changed = BSS_CHANGED_IDLE;
1402                         break;
1403                 case NL80211_IFTYPE_UNSPECIFIED:
1404                 case NUM_NL80211_IFTYPES:
1405                 case NL80211_IFTYPE_P2P_CLIENT:
1406                 case NL80211_IFTYPE_P2P_GO:
1407                         WARN_ON(1);
1408                         break;
1409                 }
1410         }
1411
1412         ieee80211_recalc_ps(local, -1);
1413
1414         /*
1415          * The sta might be in psm against the ap (e.g. because
1416          * this was the state before a hw restart), so we
1417          * explicitly send a null packet in order to make sure
1418          * it'll sync against the ap (and get out of psm).
1419          */
1420         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1421                 list_for_each_entry(sdata, &local->interfaces, list) {
1422                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1423                                 continue;
1424
1425                         ieee80211_send_nullfunc(local, sdata, 0);
1426                 }
1427         }
1428
1429         /* APs are now beaconing, add back stations */
1430         mutex_lock(&local->sta_mtx);
1431         list_for_each_entry(sta, &local->sta_list, list) {
1432                 enum ieee80211_sta_state state;
1433
1434                 if (!sta->uploaded)
1435                         continue;
1436
1437                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1438                         continue;
1439
1440                 for (state = IEEE80211_STA_NOTEXIST;
1441                      state < sta->sta_state; state++)
1442                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1443                                               state + 1));
1444         }
1445         mutex_unlock(&local->sta_mtx);
1446
1447         /* add back keys */
1448         list_for_each_entry(sdata, &local->interfaces, list)
1449                 if (ieee80211_sdata_running(sdata))
1450                         ieee80211_enable_keys(sdata);
1451
1452  wake_up:
1453         local->in_reconfig = false;
1454         barrier();
1455
1456         /*
1457          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1458          * sessions can be established after a resume.
1459          *
1460          * Also tear down aggregation sessions since reconfiguring
1461          * them in a hardware restart scenario is not easily done
1462          * right now, and the hardware will have lost information
1463          * about the sessions, but we and the AP still think they
1464          * are active. This is really a workaround though.
1465          */
1466         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1467                 mutex_lock(&local->sta_mtx);
1468
1469                 list_for_each_entry(sta, &local->sta_list, list) {
1470                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1471                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1472                 }
1473
1474                 mutex_unlock(&local->sta_mtx);
1475         }
1476
1477         ieee80211_wake_queues_by_reason(hw,
1478                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1479
1480         /*
1481          * If this is for hw restart things are still running.
1482          * We may want to change that later, however.
1483          */
1484         if (!local->suspended)
1485                 return 0;
1486
1487 #ifdef CONFIG_PM
1488         /* first set suspended false, then resuming */
1489         local->suspended = false;
1490         mb();
1491         local->resuming = false;
1492
1493         list_for_each_entry(sdata, &local->interfaces, list) {
1494                 switch(sdata->vif.type) {
1495                 case NL80211_IFTYPE_STATION:
1496                         ieee80211_sta_restart(sdata);
1497                         break;
1498                 case NL80211_IFTYPE_ADHOC:
1499                         ieee80211_ibss_restart(sdata);
1500                         break;
1501                 case NL80211_IFTYPE_MESH_POINT:
1502                         ieee80211_mesh_restart(sdata);
1503                         break;
1504                 default:
1505                         break;
1506                 }
1507         }
1508
1509         mod_timer(&local->sta_cleanup, jiffies + 1);
1510
1511         mutex_lock(&local->sta_mtx);
1512         list_for_each_entry(sta, &local->sta_list, list)
1513                 mesh_plink_restart(sta);
1514         mutex_unlock(&local->sta_mtx);
1515 #else
1516         WARN_ON(1);
1517 #endif
1518         return 0;
1519 }
1520
1521 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1522 {
1523         struct ieee80211_sub_if_data *sdata;
1524         struct ieee80211_local *local;
1525         struct ieee80211_key *key;
1526
1527         if (WARN_ON(!vif))
1528                 return;
1529
1530         sdata = vif_to_sdata(vif);
1531         local = sdata->local;
1532
1533         if (WARN_ON(!local->resuming))
1534                 return;
1535
1536         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1537                 return;
1538
1539         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1540
1541         mutex_lock(&local->key_mtx);
1542         list_for_each_entry(key, &sdata->key_list, list)
1543                 key->flags |= KEY_FLAG_TAINTED;
1544         mutex_unlock(&local->key_mtx);
1545 }
1546 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1547
1548 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1549                           enum ieee80211_smps_mode *smps_mode)
1550 {
1551         if (ifmgd->associated) {
1552                 *smps_mode = ifmgd->ap_smps;
1553
1554                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1555                         if (ifmgd->powersave)
1556                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1557                         else
1558                                 *smps_mode = IEEE80211_SMPS_OFF;
1559                 }
1560
1561                 return 1;
1562         }
1563
1564         return 0;
1565 }
1566
1567 /* must hold iflist_mtx */
1568 void ieee80211_recalc_smps(struct ieee80211_local *local)
1569 {
1570         struct ieee80211_sub_if_data *sdata;
1571         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1572         int count = 0;
1573
1574         lockdep_assert_held(&local->iflist_mtx);
1575
1576         /*
1577          * This function could be improved to handle multiple
1578          * interfaces better, but right now it makes any
1579          * non-station interfaces force SM PS to be turned
1580          * off. If there are multiple station interfaces it
1581          * could also use the best possible mode, e.g. if
1582          * one is in static and the other in dynamic then
1583          * dynamic is ok.
1584          */
1585
1586         list_for_each_entry(sdata, &local->interfaces, list) {
1587                 if (!ieee80211_sdata_running(sdata))
1588                         continue;
1589                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
1590                         continue;
1591                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1592                         goto set;
1593
1594                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1595
1596                 if (count > 1) {
1597                         smps_mode = IEEE80211_SMPS_OFF;
1598                         break;
1599                 }
1600         }
1601
1602         if (smps_mode == local->smps_mode)
1603                 return;
1604
1605  set:
1606         local->smps_mode = smps_mode;
1607         /* changed flag is auto-detected for this */
1608         ieee80211_hw_config(local, 0);
1609 }
1610
1611 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1612 {
1613         int i;
1614
1615         for (i = 0; i < n_ids; i++)
1616                 if (ids[i] == id)
1617                         return true;
1618         return false;
1619 }
1620
1621 /**
1622  * ieee80211_ie_split - split an IE buffer according to ordering
1623  *
1624  * @ies: the IE buffer
1625  * @ielen: the length of the IE buffer
1626  * @ids: an array with element IDs that are allowed before
1627  *      the split
1628  * @n_ids: the size of the element ID array
1629  * @offset: offset where to start splitting in the buffer
1630  *
1631  * This function splits an IE buffer by updating the @offset
1632  * variable to point to the location where the buffer should be
1633  * split.
1634  *
1635  * It assumes that the given IE buffer is well-formed, this
1636  * has to be guaranteed by the caller!
1637  *
1638  * It also assumes that the IEs in the buffer are ordered
1639  * correctly, if not the result of using this function will not
1640  * be ordered correctly either, i.e. it does no reordering.
1641  *
1642  * The function returns the offset where the next part of the
1643  * buffer starts, which may be @ielen if the entire (remainder)
1644  * of the buffer should be used.
1645  */
1646 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1647                           const u8 *ids, int n_ids, size_t offset)
1648 {
1649         size_t pos = offset;
1650
1651         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1652                 pos += 2 + ies[pos + 1];
1653
1654         return pos;
1655 }
1656
1657 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1658 {
1659         size_t pos = offset;
1660
1661         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1662                 pos += 2 + ies[pos + 1];
1663
1664         return pos;
1665 }
1666
1667 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1668                                             int rssi_min_thold,
1669                                             int rssi_max_thold)
1670 {
1671         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1672
1673         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1674                 return;
1675
1676         /*
1677          * Scale up threshold values before storing it, as the RSSI averaging
1678          * algorithm uses a scaled up value as well. Change this scaling
1679          * factor if the RSSI averaging algorithm changes.
1680          */
1681         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1682         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1683 }
1684
1685 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1686                                     int rssi_min_thold,
1687                                     int rssi_max_thold)
1688 {
1689         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1690
1691         WARN_ON(rssi_min_thold == rssi_max_thold ||
1692                 rssi_min_thold > rssi_max_thold);
1693
1694         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1695                                        rssi_max_thold);
1696 }
1697 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1698
1699 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1700 {
1701         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1702
1703         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1704 }
1705 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1706
1707 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1708                               u16 cap)
1709 {
1710         __le16 tmp;
1711
1712         *pos++ = WLAN_EID_HT_CAPABILITY;
1713         *pos++ = sizeof(struct ieee80211_ht_cap);
1714         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1715
1716         /* capability flags */
1717         tmp = cpu_to_le16(cap);
1718         memcpy(pos, &tmp, sizeof(u16));
1719         pos += sizeof(u16);
1720
1721         /* AMPDU parameters */
1722         *pos++ = ht_cap->ampdu_factor |
1723                  (ht_cap->ampdu_density <<
1724                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1725
1726         /* MCS set */
1727         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1728         pos += sizeof(ht_cap->mcs);
1729
1730         /* extended capabilities */
1731         pos += sizeof(__le16);
1732
1733         /* BF capabilities */
1734         pos += sizeof(__le32);
1735
1736         /* antenna selection */
1737         pos += sizeof(u8);
1738
1739         return pos;
1740 }
1741
1742 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1743                                                            u32 cap)
1744 {
1745         __le32 tmp;
1746
1747         *pos++ = WLAN_EID_VHT_CAPABILITY;
1748         *pos++ = sizeof(struct ieee80211_vht_capabilities);
1749         memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1750
1751         /* capability flags */
1752         tmp = cpu_to_le32(cap);
1753         memcpy(pos, &tmp, sizeof(u32));
1754         pos += sizeof(u32);
1755
1756         /* VHT MCS set */
1757         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1758         pos += sizeof(vht_cap->vht_mcs);
1759
1760         return pos;
1761 }
1762
1763 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1764                                struct ieee80211_channel *channel,
1765                                enum nl80211_channel_type channel_type,
1766                                u16 prot_mode)
1767 {
1768         struct ieee80211_ht_operation *ht_oper;
1769         /* Build HT Information */
1770         *pos++ = WLAN_EID_HT_OPERATION;
1771         *pos++ = sizeof(struct ieee80211_ht_operation);
1772         ht_oper = (struct ieee80211_ht_operation *)pos;
1773         ht_oper->primary_chan =
1774                         ieee80211_frequency_to_channel(channel->center_freq);
1775         switch (channel_type) {
1776         case NL80211_CHAN_HT40MINUS:
1777                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1778                 break;
1779         case NL80211_CHAN_HT40PLUS:
1780                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1781                 break;
1782         case NL80211_CHAN_HT20:
1783         default:
1784                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1785                 break;
1786         }
1787         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1788             channel_type != NL80211_CHAN_NO_HT &&
1789             channel_type != NL80211_CHAN_HT20)
1790                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1791
1792         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1793         ht_oper->stbc_param = 0x0000;
1794
1795         /* It seems that Basic MCS set and Supported MCS set
1796            are identical for the first 10 bytes */
1797         memset(&ht_oper->basic_set, 0, 16);
1798         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1799
1800         return pos + sizeof(struct ieee80211_ht_operation);
1801 }
1802
1803 enum nl80211_channel_type
1804 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1805 {
1806         enum nl80211_channel_type channel_type;
1807
1808         if (!ht_oper)
1809                 return NL80211_CHAN_NO_HT;
1810
1811         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1812         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1813                 channel_type = NL80211_CHAN_HT20;
1814                 break;
1815         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1816                 channel_type = NL80211_CHAN_HT40PLUS;
1817                 break;
1818         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1819                 channel_type = NL80211_CHAN_HT40MINUS;
1820                 break;
1821         default:
1822                 channel_type = NL80211_CHAN_NO_HT;
1823         }
1824
1825         return channel_type;
1826 }
1827
1828 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1829                             struct sk_buff *skb, bool need_basic,
1830                             enum ieee80211_band band)
1831 {
1832         struct ieee80211_local *local = sdata->local;
1833         struct ieee80211_supported_band *sband;
1834         int rate;
1835         u8 i, rates, *pos;
1836         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1837
1838         sband = local->hw.wiphy->bands[band];
1839         rates = sband->n_bitrates;
1840         if (rates > 8)
1841                 rates = 8;
1842
1843         if (skb_tailroom(skb) < rates + 2)
1844                 return -ENOMEM;
1845
1846         pos = skb_put(skb, rates + 2);
1847         *pos++ = WLAN_EID_SUPP_RATES;
1848         *pos++ = rates;
1849         for (i = 0; i < rates; i++) {
1850                 u8 basic = 0;
1851                 if (need_basic && basic_rates & BIT(i))
1852                         basic = 0x80;
1853                 rate = sband->bitrates[i].bitrate;
1854                 *pos++ = basic | (u8) (rate / 5);
1855         }
1856
1857         return 0;
1858 }
1859
1860 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1861                                 struct sk_buff *skb, bool need_basic,
1862                                 enum ieee80211_band band)
1863 {
1864         struct ieee80211_local *local = sdata->local;
1865         struct ieee80211_supported_band *sband;
1866         int rate;
1867         u8 i, exrates, *pos;
1868         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1869
1870         sband = local->hw.wiphy->bands[band];
1871         exrates = sband->n_bitrates;
1872         if (exrates > 8)
1873                 exrates -= 8;
1874         else
1875                 exrates = 0;
1876
1877         if (skb_tailroom(skb) < exrates + 2)
1878                 return -ENOMEM;
1879
1880         if (exrates) {
1881                 pos = skb_put(skb, exrates + 2);
1882                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1883                 *pos++ = exrates;
1884                 for (i = 8; i < sband->n_bitrates; i++) {
1885                         u8 basic = 0;
1886                         if (need_basic && basic_rates & BIT(i))
1887                                 basic = 0x80;
1888                         rate = sband->bitrates[i].bitrate;
1889                         *pos++ = basic | (u8) (rate / 5);
1890                 }
1891         }
1892         return 0;
1893 }
1894
1895 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1896 {
1897         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1898         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1899
1900         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1901                 /* non-managed type inferfaces */
1902                 return 0;
1903         }
1904         return ifmgd->ave_beacon_signal;
1905 }
1906 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);