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                         if (elen != 1) {
 796                                 elem_parse_failed = true;
 797                                 break;
 798                         }
 799                         elems->pwr_constr_elem = pos;
 800                         break;
 801                 case WLAN_EID_TIMEOUT_INTERVAL:
 802                         elems->timeout_int = pos;
 803                         elems->timeout_int_len = elen;
 804                         break;
 805                 default:
 806                         break;
 807                 }
 808
 809                 if (elem_parse_failed)
 810                         elems->parse_error = true;
 811                 else
 812                         set_bit(id, seen_elems);
 813
 814                 left -= elen;
 815                 pos += elen;
 816         }
 817
 818         if (left != 0)
 819                 elems->parse_error = true;
 820
 821         return crc;
 822 }
 823
 824 void ieee802_11_parse_elems(u8 *start, size_t len,
 825                             struct ieee802_11_elems *elems)
 826 {
 827         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 828 }
 829
 830 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 831                                bool bss_notify)
 832 {
 833         struct ieee80211_local *local = sdata->local;
 834         struct ieee80211_tx_queue_params qparam;
 835         int ac;
 836         bool use_11b, enable_qos;
 837         int aCWmin, aCWmax;
 838
 839         if (!local->ops->conf_tx)
 840                 return;
 841
 842         if (local->hw.queues < IEEE80211_NUM_ACS)
 843                 return;
 844
 845         memset(&qparam, 0, sizeof(qparam));
 846
 847         use_11b = (local->oper_channel->band == IEEE80211_BAND_2GHZ) &&
 848                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 849
 850         /*
 851          * By default disable QoS in STA mode for old access points, which do
 852          * not support 802.11e. New APs will provide proper queue parameters,
 853          * that we will configure later.
 854          */
 855         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 856
 857         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 858                 /* Set defaults according to 802.11-2007 Table 7-37 */
 859                 aCWmax = 1023;
 860                 if (use_11b)
 861                         aCWmin = 31;
 862                 else
 863                         aCWmin = 15;
 864
 865                 if (enable_qos) {
 866                         switch (ac) {
 867                         case IEEE80211_AC_BK:
 868                                 qparam.cw_max = aCWmax;
 869                                 qparam.cw_min = aCWmin;
 870                                 qparam.txop = 0;
 871                                 qparam.aifs = 7;
 872                                 break;
 873                         /* never happens but let's not leave undefined */
 874                         default:
 875                         case IEEE80211_AC_BE:
 876                                 qparam.cw_max = aCWmax;
 877                                 qparam.cw_min = aCWmin;
 878                                 qparam.txop = 0;
 879                                 qparam.aifs = 3;
 880                                 break;
 881                         case IEEE80211_AC_VI:
 882                                 qparam.cw_max = aCWmin;
 883                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 884                                 if (use_11b)
 885                                         qparam.txop = 6016/32;
 886                                 else
 887                                         qparam.txop = 3008/32;
 888                                 qparam.aifs = 2;
 889                                 break;
 890                         case IEEE80211_AC_VO:
 891                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 892                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 893                                 if (use_11b)
 894                                         qparam.txop = 3264/32;
 895                                 else
 896                                         qparam.txop = 1504/32;
 897                                 qparam.aifs = 2;
 898                                 break;
 899                         }
 900                 } else {
 901                         /* Confiure old 802.11b/g medium access rules. */
 902                         qparam.cw_max = aCWmax;
 903                         qparam.cw_min = aCWmin;
 904                         qparam.txop = 0;
 905                         qparam.aifs = 2;
 906                 }
 907
 908                 qparam.uapsd = false;
 909
 910                 sdata->tx_conf[ac] = qparam;
 911                 drv_conf_tx(local, sdata, ac, &qparam);
 912         }
 913
 914         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 915             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 916                 sdata->vif.bss_conf.qos = enable_qos;
 917                 if (bss_notify)
 918                         ieee80211_bss_info_change_notify(sdata,
 919                                                          BSS_CHANGED_QOS);
 920         }
 921 }
 922
 923 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 924                                   const size_t supp_rates_len,
 925                                   const u8 *supp_rates)
 926 {
 927         struct ieee80211_local *local = sdata->local;
 928         int i, have_higher_than_11mbit = 0;
 929
 930         /* cf. IEEE 802.11 9.2.12 */
 931         for (i = 0; i < supp_rates_len; i++)
 932                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 933                         have_higher_than_11mbit = 1;
 934
 935         if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
 936             have_higher_than_11mbit)
 937                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 938         else
 939                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 940
 941         ieee80211_set_wmm_default(sdata, true);
 942 }
 943
 944 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 945                               enum ieee80211_band band)
 946 {
 947         struct ieee80211_supported_band *sband;
 948         struct ieee80211_rate *bitrates;
 949         u32 mandatory_rates;
 950         enum ieee80211_rate_flags mandatory_flag;
 951         int i;
 952
 953         sband = local->hw.wiphy->bands[band];
 954         if (WARN_ON(!sband))
 955                 return 1;
 956
 957         if (band == IEEE80211_BAND_2GHZ)
 958                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 959         else
 960                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 961
 962         bitrates = sband->bitrates;
 963         mandatory_rates = 0;
 964         for (i = 0; i < sband->n_bitrates; i++)
 965                 if (bitrates[i].flags & mandatory_flag)
 966                         mandatory_rates |= BIT(i);
 967         return mandatory_rates;
 968 }
 969
 970 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 971                          u16 transaction, u16 auth_alg,
 972                          u8 *extra, size_t extra_len, const u8 *da,
 973                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 974 {
 975         struct ieee80211_local *local = sdata->local;
 976         struct sk_buff *skb;
 977         struct ieee80211_mgmt *mgmt;
 978         int err;
 979
 980         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 981                             sizeof(*mgmt) + 6 + extra_len);
 982         if (!skb)
 983                 return;
 984
 985         skb_reserve(skb, local->hw.extra_tx_headroom);
 986
 987         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 988         memset(mgmt, 0, 24 + 6);
 989         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 990                                           IEEE80211_STYPE_AUTH);
 991         memcpy(mgmt->da, da, ETH_ALEN);
 992         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 993         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 994         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 995         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 996         mgmt->u.auth.status_code = cpu_to_le16(0);
 997         if (extra)
 998                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 999
1000         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1001                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1002                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1003                 WARN_ON(err);
1004         }
1005
1006         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1007         ieee80211_tx_skb(sdata, skb);
1008 }
1009
1010 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1011                              const u8 *ie, size_t ie_len,
1012                              enum ieee80211_band band, u32 rate_mask,
1013                              u8 channel)
1014 {
1015         struct ieee80211_supported_band *sband;
1016         u8 *pos;
1017         size_t offset = 0, noffset;
1018         int supp_rates_len, i;
1019         u8 rates[32];
1020         int num_rates;
1021         int ext_rates_len;
1022
1023         sband = local->hw.wiphy->bands[band];
1024         if (WARN_ON_ONCE(!sband))
1025                 return 0;
1026
1027         pos = buffer;
1028
1029         num_rates = 0;
1030         for (i = 0; i < sband->n_bitrates; i++) {
1031                 if ((BIT(i) & rate_mask) == 0)
1032                         continue; /* skip rate */
1033                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1034         }
1035
1036         supp_rates_len = min_t(int, num_rates, 8);
1037
1038         *pos++ = WLAN_EID_SUPP_RATES;
1039         *pos++ = supp_rates_len;
1040         memcpy(pos, rates, supp_rates_len);
1041         pos += supp_rates_len;
1042
1043         /* insert "request information" if in custom IEs */
1044         if (ie && ie_len) {
1045                 static const u8 before_extrates[] = {
1046                         WLAN_EID_SSID,
1047                         WLAN_EID_SUPP_RATES,
1048                         WLAN_EID_REQUEST,
1049                 };
1050                 noffset = ieee80211_ie_split(ie, ie_len,
1051                                              before_extrates,
1052                                              ARRAY_SIZE(before_extrates),
1053                                              offset);
1054                 memcpy(pos, ie + offset, noffset - offset);
1055                 pos += noffset - offset;
1056                 offset = noffset;
1057         }
1058
1059         ext_rates_len = num_rates - supp_rates_len;
1060         if (ext_rates_len > 0) {
1061                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1062                 *pos++ = ext_rates_len;
1063                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1064                 pos += ext_rates_len;
1065         }
1066
1067         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1068                 *pos++ = WLAN_EID_DS_PARAMS;
1069                 *pos++ = 1;
1070                 *pos++ = channel;
1071         }
1072
1073         /* insert custom IEs that go before HT */
1074         if (ie && ie_len) {
1075                 static const u8 before_ht[] = {
1076                         WLAN_EID_SSID,
1077                         WLAN_EID_SUPP_RATES,
1078                         WLAN_EID_REQUEST,
1079                         WLAN_EID_EXT_SUPP_RATES,
1080                         WLAN_EID_DS_PARAMS,
1081                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1082                 };
1083                 noffset = ieee80211_ie_split(ie, ie_len,
1084                                              before_ht, ARRAY_SIZE(before_ht),
1085                                              offset);
1086                 memcpy(pos, ie + offset, noffset - offset);
1087                 pos += noffset - offset;
1088                 offset = noffset;
1089         }
1090
1091         if (sband->ht_cap.ht_supported)
1092                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1093                                                 sband->ht_cap.cap);
1094
1095         /*
1096          * If adding more here, adjust code in main.c
1097          * that calculates local->scan_ies_len.
1098          */
1099
1100         /* add any remaining custom IEs */
1101         if (ie && ie_len) {
1102                 noffset = ie_len;
1103                 memcpy(pos, ie + offset, noffset - offset);
1104                 pos += noffset - offset;
1105         }
1106
1107         if (sband->vht_cap.vht_supported)
1108                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1109                                                  sband->vht_cap.cap);
1110
1111         return pos - buffer;
1112 }
1113
1114 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1115                                           u8 *dst, u32 ratemask,
1116                                           struct ieee80211_channel *chan,
1117                                           const u8 *ssid, size_t ssid_len,
1118                                           const u8 *ie, size_t ie_len,
1119                                           bool directed)
1120 {
1121         struct ieee80211_local *local = sdata->local;
1122         struct sk_buff *skb;
1123         struct ieee80211_mgmt *mgmt;
1124         size_t buf_len;
1125         u8 *buf;
1126         u8 chan_no;
1127
1128         /* FIXME: come up with a proper value */
1129         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1130         if (!buf)
1131                 return NULL;
1132
1133         /*
1134          * Do not send DS Channel parameter for directed probe requests
1135          * in order to maximize the chance that we get a response.  Some
1136          * badly-behaved APs don't respond when this parameter is included.
1137          */
1138         if (directed)
1139                 chan_no = 0;
1140         else
1141                 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1142
1143         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, chan->band,
1144                                            ratemask, chan_no);
1145
1146         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1147                                      ssid, ssid_len,
1148                                      buf, buf_len);
1149         if (!skb)
1150                 goto out;
1151
1152         if (dst) {
1153                 mgmt = (struct ieee80211_mgmt *) skb->data;
1154                 memcpy(mgmt->da, dst, ETH_ALEN);
1155                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1156         }
1157
1158         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1159
1160  out:
1161         kfree(buf);
1162
1163         return skb;
1164 }
1165
1166 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1167                               const u8 *ssid, size_t ssid_len,
1168                               const u8 *ie, size_t ie_len,
1169                               u32 ratemask, bool directed, bool no_cck,
1170                               struct ieee80211_channel *channel)
1171 {
1172         struct sk_buff *skb;
1173
1174         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1175                                         ssid, ssid_len,
1176                                         ie, ie_len, directed);
1177         if (skb) {
1178                 if (no_cck)
1179                         IEEE80211_SKB_CB(skb)->flags |=
1180                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1181                 ieee80211_tx_skb(sdata, skb);
1182         }
1183 }
1184
1185 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1186                             struct ieee802_11_elems *elems,
1187                             enum ieee80211_band band, u32 *basic_rates)
1188 {
1189         struct ieee80211_supported_band *sband;
1190         struct ieee80211_rate *bitrates;
1191         size_t num_rates;
1192         u32 supp_rates;
1193         int i, j;
1194         sband = local->hw.wiphy->bands[band];
1195
1196         if (WARN_ON(!sband))
1197                 return 1;
1198
1199         bitrates = sband->bitrates;
1200         num_rates = sband->n_bitrates;
1201         supp_rates = 0;
1202         for (i = 0; i < elems->supp_rates_len +
1203                      elems->ext_supp_rates_len; i++) {
1204                 u8 rate = 0;
1205                 int own_rate;
1206                 bool is_basic;
1207                 if (i < elems->supp_rates_len)
1208                         rate = elems->supp_rates[i];
1209                 else if (elems->ext_supp_rates)
1210                         rate = elems->ext_supp_rates
1211                                 [i - elems->supp_rates_len];
1212                 own_rate = 5 * (rate & 0x7f);
1213                 is_basic = !!(rate & 0x80);
1214
1215                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1216                         continue;
1217
1218                 for (j = 0; j < num_rates; j++) {
1219                         if (bitrates[j].bitrate == own_rate) {
1220                                 supp_rates |= BIT(j);
1221                                 if (basic_rates && is_basic)
1222                                         *basic_rates |= BIT(j);
1223                         }
1224                 }
1225         }
1226         return supp_rates;
1227 }
1228
1229 void ieee80211_stop_device(struct ieee80211_local *local)
1230 {
1231         ieee80211_led_radio(local, false);
1232         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1233
1234         cancel_work_sync(&local->reconfig_filter);
1235
1236         flush_workqueue(local->workqueue);
1237         drv_stop(local);
1238 }
1239
1240 int ieee80211_reconfig(struct ieee80211_local *local)
1241 {
1242         struct ieee80211_hw *hw = &local->hw;
1243         struct ieee80211_sub_if_data *sdata;
1244         struct sta_info *sta;
1245         int res, i;
1246
1247 #ifdef CONFIG_PM
1248         if (local->suspended)
1249                 local->resuming = true;
1250
1251         if (local->wowlan) {
1252                 local->wowlan = false;
1253                 res = drv_resume(local);
1254                 if (res < 0) {
1255                         local->resuming = false;
1256                         return res;
1257                 }
1258                 if (res == 0)
1259                         goto wake_up;
1260                 WARN_ON(res > 1);
1261                 /*
1262                  * res is 1, which means the driver requested
1263                  * to go through a regular reset on wakeup.
1264                  */
1265         }
1266 #endif
1267         /* everything else happens only if HW was up & running */
1268         if (!local->open_count)
1269                 goto wake_up;
1270
1271         /*
1272          * Upon resume hardware can sometimes be goofy due to
1273          * various platform / driver / bus issues, so restarting
1274          * the device may at times not work immediately. Propagate
1275          * the error.
1276          */
1277         res = drv_start(local);
1278         if (res) {
1279                 WARN(local->suspended, "Hardware became unavailable "
1280                      "upon resume. This could be a software issue "
1281                      "prior to suspend or a hardware issue.\n");
1282                 return res;
1283         }
1284
1285         /* setup fragmentation threshold */
1286         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1287
1288         /* setup RTS threshold */
1289         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1290
1291         /* reset coverage class */
1292         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1293
1294         ieee80211_led_radio(local, true);
1295         ieee80211_mod_tpt_led_trig(local,
1296                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1297
1298         /* add interfaces */
1299         sdata = rtnl_dereference(local->monitor_sdata);
1300         if (sdata) {
1301                 res = drv_add_interface(local, sdata);
1302                 if (WARN_ON(res)) {
1303                         rcu_assign_pointer(local->monitor_sdata, NULL);
1304                         synchronize_net();
1305                         kfree(sdata);
1306                 }
1307         }
1308
1309         list_for_each_entry(sdata, &local->interfaces, list) {
1310                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1311                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1312                     ieee80211_sdata_running(sdata))
1313                         res = drv_add_interface(local, sdata);
1314         }
1315
1316         /* add STAs back */
1317         mutex_lock(&local->sta_mtx);
1318         list_for_each_entry(sta, &local->sta_list, list) {
1319                 enum ieee80211_sta_state state;
1320
1321                 if (!sta->uploaded)
1322                         continue;
1323
1324                 /* AP-mode stations will be added later */
1325                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1326                         continue;
1327
1328                 for (state = IEEE80211_STA_NOTEXIST;
1329                      state < sta->sta_state; state++)
1330                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1331                                               state + 1));
1332         }
1333         mutex_unlock(&local->sta_mtx);
1334
1335         /* reconfigure tx conf */
1336         if (hw->queues >= IEEE80211_NUM_ACS) {
1337                 list_for_each_entry(sdata, &local->interfaces, list) {
1338                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1339                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1340                             !ieee80211_sdata_running(sdata))
1341                                 continue;
1342
1343                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1344                                 drv_conf_tx(local, sdata, i,
1345                                             &sdata->tx_conf[i]);
1346                 }
1347         }
1348
1349         /* reconfigure hardware */
1350         ieee80211_hw_config(local, ~0);
1351
1352         ieee80211_configure_filter(local);
1353
1354         /* Finally also reconfigure all the BSS information */
1355         list_for_each_entry(sdata, &local->interfaces, list) {
1356                 u32 changed;
1357
1358                 if (!ieee80211_sdata_running(sdata))
1359                         continue;
1360
1361                 /* common change flags for all interface types */
1362                 changed = BSS_CHANGED_ERP_CTS_PROT |
1363                           BSS_CHANGED_ERP_PREAMBLE |
1364                           BSS_CHANGED_ERP_SLOT |
1365                           BSS_CHANGED_HT |
1366                           BSS_CHANGED_BASIC_RATES |
1367                           BSS_CHANGED_BEACON_INT |
1368                           BSS_CHANGED_BSSID |
1369                           BSS_CHANGED_CQM |
1370                           BSS_CHANGED_QOS |
1371                           BSS_CHANGED_IDLE;
1372
1373                 switch (sdata->vif.type) {
1374                 case NL80211_IFTYPE_STATION:
1375                         changed |= BSS_CHANGED_ASSOC |
1376                                    BSS_CHANGED_ARP_FILTER |
1377                                    BSS_CHANGED_PS;
1378                         mutex_lock(&sdata->u.mgd.mtx);
1379                         ieee80211_bss_info_change_notify(sdata, changed);
1380                         mutex_unlock(&sdata->u.mgd.mtx);
1381                         break;
1382                 case NL80211_IFTYPE_ADHOC:
1383                         changed |= BSS_CHANGED_IBSS;
1384                         /* fall through */
1385                 case NL80211_IFTYPE_AP:
1386                         changed |= BSS_CHANGED_SSID;
1387
1388                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1389                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1390
1391                         /* fall through */
1392                 case NL80211_IFTYPE_MESH_POINT:
1393                         changed |= BSS_CHANGED_BEACON |
1394                                    BSS_CHANGED_BEACON_ENABLED;
1395                         ieee80211_bss_info_change_notify(sdata, changed);
1396                         break;
1397                 case NL80211_IFTYPE_WDS:
1398                         break;
1399                 case NL80211_IFTYPE_AP_VLAN:
1400                 case NL80211_IFTYPE_MONITOR:
1401                         /* ignore virtual */
1402                         break;
1403                 case NL80211_IFTYPE_P2P_DEVICE:
1404                         changed = BSS_CHANGED_IDLE;
1405                         break;
1406                 case NL80211_IFTYPE_UNSPECIFIED:
1407                 case NUM_NL80211_IFTYPES:
1408                 case NL80211_IFTYPE_P2P_CLIENT:
1409                 case NL80211_IFTYPE_P2P_GO:
1410                         WARN_ON(1);
1411                         break;
1412                 }
1413         }
1414
1415         ieee80211_recalc_ps(local, -1);
1416
1417         /*
1418          * The sta might be in psm against the ap (e.g. because
1419          * this was the state before a hw restart), so we
1420          * explicitly send a null packet in order to make sure
1421          * it'll sync against the ap (and get out of psm).
1422          */
1423         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1424                 list_for_each_entry(sdata, &local->interfaces, list) {
1425                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1426                                 continue;
1427
1428                         ieee80211_send_nullfunc(local, sdata, 0);
1429                 }
1430         }
1431
1432         /* APs are now beaconing, add back stations */
1433         mutex_lock(&local->sta_mtx);
1434         list_for_each_entry(sta, &local->sta_list, list) {
1435                 enum ieee80211_sta_state state;
1436
1437                 if (!sta->uploaded)
1438                         continue;
1439
1440                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1441                         continue;
1442
1443                 for (state = IEEE80211_STA_NOTEXIST;
1444                      state < sta->sta_state; state++)
1445                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1446                                               state + 1));
1447         }
1448         mutex_unlock(&local->sta_mtx);
1449
1450         /* add back keys */
1451         list_for_each_entry(sdata, &local->interfaces, list)
1452                 if (ieee80211_sdata_running(sdata))
1453                         ieee80211_enable_keys(sdata);
1454
1455  wake_up:
1456         local->in_reconfig = false;
1457         barrier();
1458
1459         /*
1460          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1461          * sessions can be established after a resume.
1462          *
1463          * Also tear down aggregation sessions since reconfiguring
1464          * them in a hardware restart scenario is not easily done
1465          * right now, and the hardware will have lost information
1466          * about the sessions, but we and the AP still think they
1467          * are active. This is really a workaround though.
1468          */
1469         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1470                 mutex_lock(&local->sta_mtx);
1471
1472                 list_for_each_entry(sta, &local->sta_list, list) {
1473                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1474                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1475                 }
1476
1477                 mutex_unlock(&local->sta_mtx);
1478         }
1479
1480         ieee80211_wake_queues_by_reason(hw,
1481                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1482
1483         /*
1484          * If this is for hw restart things are still running.
1485          * We may want to change that later, however.
1486          */
1487         if (!local->suspended)
1488                 return 0;
1489
1490 #ifdef CONFIG_PM
1491         /* first set suspended false, then resuming */
1492         local->suspended = false;
1493         mb();
1494         local->resuming = false;
1495
1496         list_for_each_entry(sdata, &local->interfaces, list) {
1497                 switch(sdata->vif.type) {
1498                 case NL80211_IFTYPE_STATION:
1499                         ieee80211_sta_restart(sdata);
1500                         break;
1501                 case NL80211_IFTYPE_ADHOC:
1502                         ieee80211_ibss_restart(sdata);
1503                         break;
1504                 case NL80211_IFTYPE_MESH_POINT:
1505                         ieee80211_mesh_restart(sdata);
1506                         break;
1507                 default:
1508                         break;
1509                 }
1510         }
1511
1512         mod_timer(&local->sta_cleanup, jiffies + 1);
1513
1514         mutex_lock(&local->sta_mtx);
1515         list_for_each_entry(sta, &local->sta_list, list)
1516                 mesh_plink_restart(sta);
1517         mutex_unlock(&local->sta_mtx);
1518 #else
1519         WARN_ON(1);
1520 #endif
1521         return 0;
1522 }
1523
1524 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1525 {
1526         struct ieee80211_sub_if_data *sdata;
1527         struct ieee80211_local *local;
1528         struct ieee80211_key *key;
1529
1530         if (WARN_ON(!vif))
1531                 return;
1532
1533         sdata = vif_to_sdata(vif);
1534         local = sdata->local;
1535
1536         if (WARN_ON(!local->resuming))
1537                 return;
1538
1539         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1540                 return;
1541
1542         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1543
1544         mutex_lock(&local->key_mtx);
1545         list_for_each_entry(key, &sdata->key_list, list)
1546                 key->flags |= KEY_FLAG_TAINTED;
1547         mutex_unlock(&local->key_mtx);
1548 }
1549 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1550
1551 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1552                           enum ieee80211_smps_mode *smps_mode)
1553 {
1554         if (ifmgd->associated) {
1555                 *smps_mode = ifmgd->ap_smps;
1556
1557                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1558                         if (ifmgd->powersave)
1559                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1560                         else
1561                                 *smps_mode = IEEE80211_SMPS_OFF;
1562                 }
1563
1564                 return 1;
1565         }
1566
1567         return 0;
1568 }
1569
1570 /* must hold iflist_mtx */
1571 void ieee80211_recalc_smps(struct ieee80211_local *local)
1572 {
1573         struct ieee80211_sub_if_data *sdata;
1574         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1575         int count = 0;
1576
1577         lockdep_assert_held(&local->iflist_mtx);
1578
1579         /*
1580          * This function could be improved to handle multiple
1581          * interfaces better, but right now it makes any
1582          * non-station interfaces force SM PS to be turned
1583          * off. If there are multiple station interfaces it
1584          * could also use the best possible mode, e.g. if
1585          * one is in static and the other in dynamic then
1586          * dynamic is ok.
1587          */
1588
1589         list_for_each_entry(sdata, &local->interfaces, list) {
1590                 if (!ieee80211_sdata_running(sdata))
1591                         continue;
1592                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
1593                         continue;
1594                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1595                         goto set;
1596
1597                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1598
1599                 if (count > 1) {
1600                         smps_mode = IEEE80211_SMPS_OFF;
1601                         break;
1602                 }
1603         }
1604
1605         if (smps_mode == local->smps_mode)
1606                 return;
1607
1608  set:
1609         local->smps_mode = smps_mode;
1610         /* changed flag is auto-detected for this */
1611         ieee80211_hw_config(local, 0);
1612 }
1613
1614 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1615 {
1616         int i;
1617
1618         for (i = 0; i < n_ids; i++)
1619                 if (ids[i] == id)
1620                         return true;
1621         return false;
1622 }
1623
1624 /**
1625  * ieee80211_ie_split - split an IE buffer according to ordering
1626  *
1627  * @ies: the IE buffer
1628  * @ielen: the length of the IE buffer
1629  * @ids: an array with element IDs that are allowed before
1630  *      the split
1631  * @n_ids: the size of the element ID array
1632  * @offset: offset where to start splitting in the buffer
1633  *
1634  * This function splits an IE buffer by updating the @offset
1635  * variable to point to the location where the buffer should be
1636  * split.
1637  *
1638  * It assumes that the given IE buffer is well-formed, this
1639  * has to be guaranteed by the caller!
1640  *
1641  * It also assumes that the IEs in the buffer are ordered
1642  * correctly, if not the result of using this function will not
1643  * be ordered correctly either, i.e. it does no reordering.
1644  *
1645  * The function returns the offset where the next part of the
1646  * buffer starts, which may be @ielen if the entire (remainder)
1647  * of the buffer should be used.
1648  */
1649 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1650                           const u8 *ids, int n_ids, size_t offset)
1651 {
1652         size_t pos = offset;
1653
1654         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1655                 pos += 2 + ies[pos + 1];
1656
1657         return pos;
1658 }
1659
1660 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1661 {
1662         size_t pos = offset;
1663
1664         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1665                 pos += 2 + ies[pos + 1];
1666
1667         return pos;
1668 }
1669
1670 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1671                                             int rssi_min_thold,
1672                                             int rssi_max_thold)
1673 {
1674         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1675
1676         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1677                 return;
1678
1679         /*
1680          * Scale up threshold values before storing it, as the RSSI averaging
1681          * algorithm uses a scaled up value as well. Change this scaling
1682          * factor if the RSSI averaging algorithm changes.
1683          */
1684         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1685         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1686 }
1687
1688 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1689                                     int rssi_min_thold,
1690                                     int rssi_max_thold)
1691 {
1692         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1693
1694         WARN_ON(rssi_min_thold == rssi_max_thold ||
1695                 rssi_min_thold > rssi_max_thold);
1696
1697         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1698                                        rssi_max_thold);
1699 }
1700 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1701
1702 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1703 {
1704         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1705
1706         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1707 }
1708 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1709
1710 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1711                               u16 cap)
1712 {
1713         __le16 tmp;
1714
1715         *pos++ = WLAN_EID_HT_CAPABILITY;
1716         *pos++ = sizeof(struct ieee80211_ht_cap);
1717         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1718
1719         /* capability flags */
1720         tmp = cpu_to_le16(cap);
1721         memcpy(pos, &tmp, sizeof(u16));
1722         pos += sizeof(u16);
1723
1724         /* AMPDU parameters */
1725         *pos++ = ht_cap->ampdu_factor |
1726                  (ht_cap->ampdu_density <<
1727                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1728
1729         /* MCS set */
1730         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1731         pos += sizeof(ht_cap->mcs);
1732
1733         /* extended capabilities */
1734         pos += sizeof(__le16);
1735
1736         /* BF capabilities */
1737         pos += sizeof(__le32);
1738
1739         /* antenna selection */
1740         pos += sizeof(u8);
1741
1742         return pos;
1743 }
1744
1745 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1746                                                            u32 cap)
1747 {
1748         __le32 tmp;
1749
1750         *pos++ = WLAN_EID_VHT_CAPABILITY;
1751         *pos++ = sizeof(struct ieee80211_vht_capabilities);
1752         memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1753
1754         /* capability flags */
1755         tmp = cpu_to_le32(cap);
1756         memcpy(pos, &tmp, sizeof(u32));
1757         pos += sizeof(u32);
1758
1759         /* VHT MCS set */
1760         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1761         pos += sizeof(vht_cap->vht_mcs);
1762
1763         return pos;
1764 }
1765
1766 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1767                                struct ieee80211_channel *channel,
1768                                enum nl80211_channel_type channel_type,
1769                                u16 prot_mode)
1770 {
1771         struct ieee80211_ht_operation *ht_oper;
1772         /* Build HT Information */
1773         *pos++ = WLAN_EID_HT_OPERATION;
1774         *pos++ = sizeof(struct ieee80211_ht_operation);
1775         ht_oper = (struct ieee80211_ht_operation *)pos;
1776         ht_oper->primary_chan =
1777                         ieee80211_frequency_to_channel(channel->center_freq);
1778         switch (channel_type) {
1779         case NL80211_CHAN_HT40MINUS:
1780                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1781                 break;
1782         case NL80211_CHAN_HT40PLUS:
1783                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1784                 break;
1785         case NL80211_CHAN_HT20:
1786         default:
1787                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1788                 break;
1789         }
1790         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1791             channel_type != NL80211_CHAN_NO_HT &&
1792             channel_type != NL80211_CHAN_HT20)
1793                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1794
1795         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1796         ht_oper->stbc_param = 0x0000;
1797
1798         /* It seems that Basic MCS set and Supported MCS set
1799            are identical for the first 10 bytes */
1800         memset(&ht_oper->basic_set, 0, 16);
1801         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1802
1803         return pos + sizeof(struct ieee80211_ht_operation);
1804 }
1805
1806 enum nl80211_channel_type
1807 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1808 {
1809         enum nl80211_channel_type channel_type;
1810
1811         if (!ht_oper)
1812                 return NL80211_CHAN_NO_HT;
1813
1814         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1815         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1816                 channel_type = NL80211_CHAN_HT20;
1817                 break;
1818         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1819                 channel_type = NL80211_CHAN_HT40PLUS;
1820                 break;
1821         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1822                 channel_type = NL80211_CHAN_HT40MINUS;
1823                 break;
1824         default:
1825                 channel_type = NL80211_CHAN_NO_HT;
1826         }
1827
1828         return channel_type;
1829 }
1830
1831 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1832                             struct sk_buff *skb, bool need_basic,
1833                             enum ieee80211_band band)
1834 {
1835         struct ieee80211_local *local = sdata->local;
1836         struct ieee80211_supported_band *sband;
1837         int rate;
1838         u8 i, rates, *pos;
1839         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1840
1841         sband = local->hw.wiphy->bands[band];
1842         rates = sband->n_bitrates;
1843         if (rates > 8)
1844                 rates = 8;
1845
1846         if (skb_tailroom(skb) < rates + 2)
1847                 return -ENOMEM;
1848
1849         pos = skb_put(skb, rates + 2);
1850         *pos++ = WLAN_EID_SUPP_RATES;
1851         *pos++ = rates;
1852         for (i = 0; i < rates; i++) {
1853                 u8 basic = 0;
1854                 if (need_basic && basic_rates & BIT(i))
1855                         basic = 0x80;
1856                 rate = sband->bitrates[i].bitrate;
1857                 *pos++ = basic | (u8) (rate / 5);
1858         }
1859
1860         return 0;
1861 }
1862
1863 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1864                                 struct sk_buff *skb, bool need_basic,
1865                                 enum ieee80211_band band)
1866 {
1867         struct ieee80211_local *local = sdata->local;
1868         struct ieee80211_supported_band *sband;
1869         int rate;
1870         u8 i, exrates, *pos;
1871         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1872
1873         sband = local->hw.wiphy->bands[band];
1874         exrates = sband->n_bitrates;
1875         if (exrates > 8)
1876                 exrates -= 8;
1877         else
1878                 exrates = 0;
1879
1880         if (skb_tailroom(skb) < exrates + 2)
1881                 return -ENOMEM;
1882
1883         if (exrates) {
1884                 pos = skb_put(skb, exrates + 2);
1885                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1886                 *pos++ = exrates;
1887                 for (i = 8; i < sband->n_bitrates; i++) {
1888                         u8 basic = 0;
1889                         if (need_basic && basic_rates & BIT(i))
1890                                 basic = 0x80;
1891                         rate = sband->bitrates[i].bitrate;
1892                         *pos++ = basic | (u8) (rate / 5);
1893                 }
1894         }
1895         return 0;
1896 }
1897
1898 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1899 {
1900         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1901         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1902
1903         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1904                 /* non-managed type inferfaces */
1905                 return 0;
1906         }
1907         return ifmgd->ave_beacon_signal;
1908 }
1909 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);