Pileus Git - ~andy/linux/blob - 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_VHT_CAPABILITY:
 745                         if (elen >= sizeof(struct ieee80211_vht_cap))
 746                                 elems->vht_cap_elem = (void *)pos;
 747                         else
 748                                 elem_parse_failed = true;
 749                         break;
 750                 case WLAN_EID_VHT_OPERATION:
 751                         if (elen >= sizeof(struct ieee80211_vht_operation))
 752                                 elems->vht_operation = (void *)pos;
 753                         else
 754                                 elem_parse_failed = true;
 755                         break;
 756                 case WLAN_EID_MESH_ID:
 757                         elems->mesh_id = pos;
 758                         elems->mesh_id_len = elen;
 759                         break;
 760                 case WLAN_EID_MESH_CONFIG:
 761                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 762                                 elems->mesh_config = (void *)pos;
 763                         else
 764                                 elem_parse_failed = true;
 765                         break;
 766                 case WLAN_EID_PEER_MGMT:
 767                         elems->peering = pos;
 768                         elems->peering_len = elen;
 769                         break;
 770                 case WLAN_EID_PREQ:
 771                         elems->preq = pos;
 772                         elems->preq_len = elen;
 773                         break;
 774                 case WLAN_EID_PREP:
 775                         elems->prep = pos;
 776                         elems->prep_len = elen;
 777                         break;
 778                 case WLAN_EID_PERR:
 779                         elems->perr = pos;
 780                         elems->perr_len = elen;
 781                         break;
 782                 case WLAN_EID_RANN:
 783                         if (elen >= sizeof(struct ieee80211_rann_ie))
 784                                 elems->rann = (void *)pos;
 785                         else
 786                                 elem_parse_failed = true;
 787                         break;
 788                 case WLAN_EID_CHANNEL_SWITCH:
 789                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 790                                 elem_parse_failed = true;
 791                                 break;
 792                         }
 793                         elems->ch_switch_ie = (void *)pos;
 794                         break;
 795                 case WLAN_EID_QUIET:
 796                         if (!elems->quiet_elem) {
 797                                 elems->quiet_elem = pos;
 798                                 elems->quiet_elem_len = elen;
 799                         }
 800                         elems->num_of_quiet_elem++;
 801                         break;
 802                 case WLAN_EID_COUNTRY:
 803                         elems->country_elem = pos;
 804                         elems->country_elem_len = elen;
 805                         break;
 806                 case WLAN_EID_PWR_CONSTRAINT:
 807                         if (elen != 1) {
 808                                 elem_parse_failed = true;
 809                                 break;
 810                         }
 811                         elems->pwr_constr_elem = pos;
 812                         break;
 813                 case WLAN_EID_TIMEOUT_INTERVAL:
 814                         elems->timeout_int = pos;
 815                         elems->timeout_int_len = elen;
 816                         break;
 817                 default:
 818                         break;
 819                 }
 820
 821                 if (elem_parse_failed)
 822                         elems->parse_error = true;
 823                 else
 824                         set_bit(id, seen_elems);
 825
 826                 left -= elen;
 827                 pos += elen;
 828         }
 829
 830         if (left != 0)
 831                 elems->parse_error = true;
 832
 833         return crc;
 834 }
 835
 836 void ieee802_11_parse_elems(u8 *start, size_t len,
 837                             struct ieee802_11_elems *elems)
 838 {
 839         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 840 }
 841
 842 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 843                                bool bss_notify)
 844 {
 845         struct ieee80211_local *local = sdata->local;
 846         struct ieee80211_tx_queue_params qparam;
 847         struct ieee80211_chanctx_conf *chanctx_conf;
 848         int ac;
 849         bool use_11b, enable_qos;
 850         int aCWmin, aCWmax;
 851
 852         if (!local->ops->conf_tx)
 853                 return;
 854
 855         if (local->hw.queues < IEEE80211_NUM_ACS)
 856                 return;
 857
 858         memset(&qparam, 0, sizeof(qparam));
 859
 860         rcu_read_lock();
 861         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 862         use_11b = (chanctx_conf &&
 863                    chanctx_conf->channel->band == IEEE80211_BAND_2GHZ) &&
 864                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 865         rcu_read_unlock();
 866
 867         /*
 868          * By default disable QoS in STA mode for old access points, which do
 869          * not support 802.11e. New APs will provide proper queue parameters,
 870          * that we will configure later.
 871          */
 872         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 873
 874         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 875                 /* Set defaults according to 802.11-2007 Table 7-37 */
 876                 aCWmax = 1023;
 877                 if (use_11b)
 878                         aCWmin = 31;
 879                 else
 880                         aCWmin = 15;
 881
 882                 if (enable_qos) {
 883                         switch (ac) {
 884                         case IEEE80211_AC_BK:
 885                                 qparam.cw_max = aCWmax;
 886                                 qparam.cw_min = aCWmin;
 887                                 qparam.txop = 0;
 888                                 qparam.aifs = 7;
 889                                 break;
 890                         /* never happens but let's not leave undefined */
 891                         default:
 892                         case IEEE80211_AC_BE:
 893                                 qparam.cw_max = aCWmax;
 894                                 qparam.cw_min = aCWmin;
 895                                 qparam.txop = 0;
 896                                 qparam.aifs = 3;
 897                                 break;
 898                         case IEEE80211_AC_VI:
 899                                 qparam.cw_max = aCWmin;
 900                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 901                                 if (use_11b)
 902                                         qparam.txop = 6016/32;
 903                                 else
 904                                         qparam.txop = 3008/32;
 905                                 qparam.aifs = 2;
 906                                 break;
 907                         case IEEE80211_AC_VO:
 908                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 909                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 910                                 if (use_11b)
 911                                         qparam.txop = 3264/32;
 912                                 else
 913                                         qparam.txop = 1504/32;
 914                                 qparam.aifs = 2;
 915                                 break;
 916                         }
 917                 } else {
 918                         /* Confiure old 802.11b/g medium access rules. */
 919                         qparam.cw_max = aCWmax;
 920                         qparam.cw_min = aCWmin;
 921                         qparam.txop = 0;
 922                         qparam.aifs = 2;
 923                 }
 924
 925                 qparam.uapsd = false;
 926
 927                 sdata->tx_conf[ac] = qparam;
 928                 drv_conf_tx(local, sdata, ac, &qparam);
 929         }
 930
 931         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 932             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 933                 sdata->vif.bss_conf.qos = enable_qos;
 934                 if (bss_notify)
 935                         ieee80211_bss_info_change_notify(sdata,
 936                                                          BSS_CHANGED_QOS);
 937         }
 938 }
 939
 940 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 941                                   const size_t supp_rates_len,
 942                                   const u8 *supp_rates)
 943 {
 944         struct ieee80211_chanctx_conf *chanctx_conf;
 945         int i, have_higher_than_11mbit = 0;
 946
 947         /* cf. IEEE 802.11 9.2.12 */
 948         for (i = 0; i < supp_rates_len; i++)
 949                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 950                         have_higher_than_11mbit = 1;
 951
 952         rcu_read_lock();
 953         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 954
 955         if (chanctx_conf &&
 956             chanctx_conf->channel->band == IEEE80211_BAND_2GHZ &&
 957             have_higher_than_11mbit)
 958                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 959         else
 960                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 961         rcu_read_unlock();
 962
 963         ieee80211_set_wmm_default(sdata, true);
 964 }
 965
 966 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 967                               enum ieee80211_band band)
 968 {
 969         struct ieee80211_supported_band *sband;
 970         struct ieee80211_rate *bitrates;
 971         u32 mandatory_rates;
 972         enum ieee80211_rate_flags mandatory_flag;
 973         int i;
 974
 975         sband = local->hw.wiphy->bands[band];
 976         if (WARN_ON(!sband))
 977                 return 1;
 978
 979         if (band == IEEE80211_BAND_2GHZ)
 980                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 981         else
 982                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 983
 984         bitrates = sband->bitrates;
 985         mandatory_rates = 0;
 986         for (i = 0; i < sband->n_bitrates; i++)
 987                 if (bitrates[i].flags & mandatory_flag)
 988                         mandatory_rates |= BIT(i);
 989         return mandatory_rates;
 990 }
 991
 992 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 993                          u16 transaction, u16 auth_alg, u16 status,
 994                          u8 *extra, size_t extra_len, const u8 *da,
 995                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 996 {
 997         struct ieee80211_local *local = sdata->local;
 998         struct sk_buff *skb;
 999         struct ieee80211_mgmt *mgmt;
1000         int err;
1001
1002         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1003                             sizeof(*mgmt) + 6 + extra_len);
1004         if (!skb)
1005                 return;
1006
1007         skb_reserve(skb, local->hw.extra_tx_headroom);
1008
1009         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1010         memset(mgmt, 0, 24 + 6);
1011         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1012                                           IEEE80211_STYPE_AUTH);
1013         memcpy(mgmt->da, da, ETH_ALEN);
1014         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1015         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1016         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1017         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1018         mgmt->u.auth.status_code = cpu_to_le16(status);
1019         if (extra)
1020                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1021
1022         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1023                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1024                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1025                 WARN_ON(err);
1026         }
1027
1028         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1029         ieee80211_tx_skb(sdata, skb);
1030 }
1031
1032 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1033                                     const u8 *bssid, u16 stype, u16 reason,
1034                                     bool send_frame, u8 *frame_buf)
1035 {
1036         struct ieee80211_local *local = sdata->local;
1037         struct sk_buff *skb;
1038         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1039
1040         /* build frame */
1041         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1042         mgmt->duration = 0; /* initialize only */
1043         mgmt->seq_ctrl = 0; /* initialize only */
1044         memcpy(mgmt->da, bssid, ETH_ALEN);
1045         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1046         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1047         /* u.deauth.reason_code == u.disassoc.reason_code */
1048         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1049
1050         if (send_frame) {
1051                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1052                                     IEEE80211_DEAUTH_FRAME_LEN);
1053                 if (!skb)
1054                         return;
1055
1056                 skb_reserve(skb, local->hw.extra_tx_headroom);
1057
1058                 /* copy in frame */
1059                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1060                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1061
1062                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1063                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1064                         IEEE80211_SKB_CB(skb)->flags |=
1065                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1066
1067                 ieee80211_tx_skb(sdata, skb);
1068         }
1069 }
1070
1071 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1072                              const u8 *ie, size_t ie_len,
1073                              enum ieee80211_band band, u32 rate_mask,
1074                              u8 channel)
1075 {
1076         struct ieee80211_supported_band *sband;
1077         u8 *pos;
1078         size_t offset = 0, noffset;
1079         int supp_rates_len, i;
1080         u8 rates[32];
1081         int num_rates;
1082         int ext_rates_len;
1083
1084         sband = local->hw.wiphy->bands[band];
1085         if (WARN_ON_ONCE(!sband))
1086                 return 0;
1087
1088         pos = buffer;
1089
1090         num_rates = 0;
1091         for (i = 0; i < sband->n_bitrates; i++) {
1092                 if ((BIT(i) & rate_mask) == 0)
1093                         continue; /* skip rate */
1094                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1095         }
1096
1097         supp_rates_len = min_t(int, num_rates, 8);
1098
1099         *pos++ = WLAN_EID_SUPP_RATES;
1100         *pos++ = supp_rates_len;
1101         memcpy(pos, rates, supp_rates_len);
1102         pos += supp_rates_len;
1103
1104         /* insert "request information" if in custom IEs */
1105         if (ie && ie_len) {
1106                 static const u8 before_extrates[] = {
1107                         WLAN_EID_SSID,
1108                         WLAN_EID_SUPP_RATES,
1109                         WLAN_EID_REQUEST,
1110                 };
1111                 noffset = ieee80211_ie_split(ie, ie_len,
1112                                              before_extrates,
1113                                              ARRAY_SIZE(before_extrates),
1114                                              offset);
1115                 memcpy(pos, ie + offset, noffset - offset);
1116                 pos += noffset - offset;
1117                 offset = noffset;
1118         }
1119
1120         ext_rates_len = num_rates - supp_rates_len;
1121         if (ext_rates_len > 0) {
1122                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1123                 *pos++ = ext_rates_len;
1124                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1125                 pos += ext_rates_len;
1126         }
1127
1128         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1129                 *pos++ = WLAN_EID_DS_PARAMS;
1130                 *pos++ = 1;
1131                 *pos++ = channel;
1132         }
1133
1134         /* insert custom IEs that go before HT */
1135         if (ie && ie_len) {
1136                 static const u8 before_ht[] = {
1137                         WLAN_EID_SSID,
1138                         WLAN_EID_SUPP_RATES,
1139                         WLAN_EID_REQUEST,
1140                         WLAN_EID_EXT_SUPP_RATES,
1141                         WLAN_EID_DS_PARAMS,
1142                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1143                 };
1144                 noffset = ieee80211_ie_split(ie, ie_len,
1145                                              before_ht, ARRAY_SIZE(before_ht),
1146                                              offset);
1147                 memcpy(pos, ie + offset, noffset - offset);
1148                 pos += noffset - offset;
1149                 offset = noffset;
1150         }
1151
1152         if (sband->ht_cap.ht_supported)
1153                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1154                                                 sband->ht_cap.cap);
1155
1156         /*
1157          * If adding more here, adjust code in main.c
1158          * that calculates local->scan_ies_len.
1159          */
1160
1161         /* add any remaining custom IEs */
1162         if (ie && ie_len) {
1163                 noffset = ie_len;
1164                 memcpy(pos, ie + offset, noffset - offset);
1165                 pos += noffset - offset;
1166         }
1167
1168         if (sband->vht_cap.vht_supported)
1169                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1170                                                  sband->vht_cap.cap);
1171
1172         return pos - buffer;
1173 }
1174
1175 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1176                                           u8 *dst, u32 ratemask,
1177                                           struct ieee80211_channel *chan,
1178                                           const u8 *ssid, size_t ssid_len,
1179                                           const u8 *ie, size_t ie_len,
1180                                           bool directed)
1181 {
1182         struct ieee80211_local *local = sdata->local;
1183         struct sk_buff *skb;
1184         struct ieee80211_mgmt *mgmt;
1185         size_t buf_len;
1186         u8 *buf;
1187         u8 chan_no;
1188
1189         /* FIXME: come up with a proper value */
1190         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1191         if (!buf)
1192                 return NULL;
1193
1194         /*
1195          * Do not send DS Channel parameter for directed probe requests
1196          * in order to maximize the chance that we get a response.  Some
1197          * badly-behaved APs don't respond when this parameter is included.
1198          */
1199         if (directed)
1200                 chan_no = 0;
1201         else
1202                 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1203
1204         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, chan->band,
1205                                            ratemask, chan_no);
1206
1207         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1208                                      ssid, ssid_len,
1209                                      buf, buf_len);
1210         if (!skb)
1211                 goto out;
1212
1213         if (dst) {
1214                 mgmt = (struct ieee80211_mgmt *) skb->data;
1215                 memcpy(mgmt->da, dst, ETH_ALEN);
1216                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1217         }
1218
1219         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1220
1221  out:
1222         kfree(buf);
1223
1224         return skb;
1225 }
1226
1227 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1228                               const u8 *ssid, size_t ssid_len,
1229                               const u8 *ie, size_t ie_len,
1230                               u32 ratemask, bool directed, bool no_cck,
1231                               struct ieee80211_channel *channel, bool scan)
1232 {
1233         struct sk_buff *skb;
1234
1235         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1236                                         ssid, ssid_len,
1237                                         ie, ie_len, directed);
1238         if (skb) {
1239                 if (no_cck)
1240                         IEEE80211_SKB_CB(skb)->flags |=
1241                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1242                 if (scan)
1243                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1244                 else
1245                         ieee80211_tx_skb(sdata, skb);
1246         }
1247 }
1248
1249 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1250                             struct ieee802_11_elems *elems,
1251                             enum ieee80211_band band, u32 *basic_rates)
1252 {
1253         struct ieee80211_supported_band *sband;
1254         struct ieee80211_rate *bitrates;
1255         size_t num_rates;
1256         u32 supp_rates;
1257         int i, j;
1258         sband = local->hw.wiphy->bands[band];
1259
1260         if (WARN_ON(!sband))
1261                 return 1;
1262
1263         bitrates = sband->bitrates;
1264         num_rates = sband->n_bitrates;
1265         supp_rates = 0;
1266         for (i = 0; i < elems->supp_rates_len +
1267                      elems->ext_supp_rates_len; i++) {
1268                 u8 rate = 0;
1269                 int own_rate;
1270                 bool is_basic;
1271                 if (i < elems->supp_rates_len)
1272                         rate = elems->supp_rates[i];
1273                 else if (elems->ext_supp_rates)
1274                         rate = elems->ext_supp_rates
1275                                 [i - elems->supp_rates_len];
1276                 own_rate = 5 * (rate & 0x7f);
1277                 is_basic = !!(rate & 0x80);
1278
1279                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1280                         continue;
1281
1282                 for (j = 0; j < num_rates; j++) {
1283                         if (bitrates[j].bitrate == own_rate) {
1284                                 supp_rates |= BIT(j);
1285                                 if (basic_rates && is_basic)
1286                                         *basic_rates |= BIT(j);
1287                         }
1288                 }
1289         }
1290         return supp_rates;
1291 }
1292
1293 void ieee80211_stop_device(struct ieee80211_local *local)
1294 {
1295         ieee80211_led_radio(local, false);
1296         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1297
1298         cancel_work_sync(&local->reconfig_filter);
1299
1300         flush_workqueue(local->workqueue);
1301         drv_stop(local);
1302 }
1303
1304 int ieee80211_reconfig(struct ieee80211_local *local)
1305 {
1306         struct ieee80211_hw *hw = &local->hw;
1307         struct ieee80211_sub_if_data *sdata;
1308         struct ieee80211_chanctx *ctx;
1309         struct sta_info *sta;
1310         int res, i;
1311
1312 #ifdef CONFIG_PM
1313         if (local->suspended)
1314                 local->resuming = true;
1315
1316         if (local->wowlan) {
1317                 local->wowlan = false;
1318                 res = drv_resume(local);
1319                 if (res < 0) {
1320                         local->resuming = false;
1321                         return res;
1322                 }
1323                 if (res == 0)
1324                         goto wake_up;
1325                 WARN_ON(res > 1);
1326                 /*
1327                  * res is 1, which means the driver requested
1328                  * to go through a regular reset on wakeup.
1329                  */
1330         }
1331 #endif
1332         /* everything else happens only if HW was up & running */
1333         if (!local->open_count)
1334                 goto wake_up;
1335
1336         /*
1337          * Upon resume hardware can sometimes be goofy due to
1338          * various platform / driver / bus issues, so restarting
1339          * the device may at times not work immediately. Propagate
1340          * the error.
1341          */
1342         res = drv_start(local);
1343         if (res) {
1344                 WARN(local->suspended, "Hardware became unavailable "
1345                      "upon resume. This could be a software issue "
1346                      "prior to suspend or a hardware issue.\n");
1347                 return res;
1348         }
1349
1350         /* setup fragmentation threshold */
1351         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1352
1353         /* setup RTS threshold */
1354         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1355
1356         /* reset coverage class */
1357         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1358
1359         ieee80211_led_radio(local, true);
1360         ieee80211_mod_tpt_led_trig(local,
1361                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1362
1363         /* add interfaces */
1364         sdata = rtnl_dereference(local->monitor_sdata);
1365         if (sdata) {
1366                 res = drv_add_interface(local, sdata);
1367                 if (WARN_ON(res)) {
1368                         rcu_assign_pointer(local->monitor_sdata, NULL);
1369                         synchronize_net();
1370                         kfree(sdata);
1371                 }
1372         }
1373
1374         list_for_each_entry(sdata, &local->interfaces, list) {
1375                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1376                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1377                     ieee80211_sdata_running(sdata))
1378                         res = drv_add_interface(local, sdata);
1379         }
1380
1381         /* add channel contexts */
1382         mutex_lock(&local->chanctx_mtx);
1383         list_for_each_entry(ctx, &local->chanctx_list, list)
1384                 WARN_ON(drv_add_chanctx(local, ctx));
1385         mutex_unlock(&local->chanctx_mtx);
1386
1387         /* add STAs back */
1388         mutex_lock(&local->sta_mtx);
1389         list_for_each_entry(sta, &local->sta_list, list) {
1390                 enum ieee80211_sta_state state;
1391
1392                 if (!sta->uploaded)
1393                         continue;
1394
1395                 /* AP-mode stations will be added later */
1396                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1397                         continue;
1398
1399                 for (state = IEEE80211_STA_NOTEXIST;
1400                      state < sta->sta_state; state++)
1401                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1402                                               state + 1));
1403         }
1404         mutex_unlock(&local->sta_mtx);
1405
1406         /* reconfigure tx conf */
1407         if (hw->queues >= IEEE80211_NUM_ACS) {
1408                 list_for_each_entry(sdata, &local->interfaces, list) {
1409                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1410                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1411                             !ieee80211_sdata_running(sdata))
1412                                 continue;
1413
1414                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1415                                 drv_conf_tx(local, sdata, i,
1416                                             &sdata->tx_conf[i]);
1417                 }
1418         }
1419
1420         /* reconfigure hardware */
1421         ieee80211_hw_config(local, ~0);
1422
1423         ieee80211_configure_filter(local);
1424
1425         /* Finally also reconfigure all the BSS information */
1426         list_for_each_entry(sdata, &local->interfaces, list) {
1427                 struct ieee80211_chanctx_conf *ctx_conf;
1428                 u32 changed;
1429
1430                 if (!ieee80211_sdata_running(sdata))
1431                         continue;
1432
1433                 mutex_lock(&local->chanctx_mtx);
1434                 ctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1435                                 lockdep_is_held(&local->chanctx_mtx));
1436                 if (ctx_conf) {
1437                         ctx = container_of(ctx_conf, struct ieee80211_chanctx,
1438                                            conf);
1439                         drv_assign_vif_chanctx(local, sdata, ctx);
1440                 }
1441                 mutex_unlock(&local->chanctx_mtx);
1442
1443                 /* common change flags for all interface types */
1444                 changed = BSS_CHANGED_ERP_CTS_PROT |
1445                           BSS_CHANGED_ERP_PREAMBLE |
1446                           BSS_CHANGED_ERP_SLOT |
1447                           BSS_CHANGED_HT |
1448                           BSS_CHANGED_BASIC_RATES |
1449                           BSS_CHANGED_BEACON_INT |
1450                           BSS_CHANGED_BSSID |
1451                           BSS_CHANGED_CQM |
1452                           BSS_CHANGED_QOS |
1453                           BSS_CHANGED_IDLE;
1454
1455                 switch (sdata->vif.type) {
1456                 case NL80211_IFTYPE_STATION:
1457                         changed |= BSS_CHANGED_ASSOC |
1458                                    BSS_CHANGED_ARP_FILTER |
1459                                    BSS_CHANGED_PS;
1460                         mutex_lock(&sdata->u.mgd.mtx);
1461                         ieee80211_bss_info_change_notify(sdata, changed);
1462                         mutex_unlock(&sdata->u.mgd.mtx);
1463                         break;
1464                 case NL80211_IFTYPE_ADHOC:
1465                         changed |= BSS_CHANGED_IBSS;
1466                         /* fall through */
1467                 case NL80211_IFTYPE_AP:
1468                         changed |= BSS_CHANGED_SSID;
1469
1470                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1471                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1472
1473                         /* fall through */
1474                 case NL80211_IFTYPE_MESH_POINT:
1475                         changed |= BSS_CHANGED_BEACON |
1476                                    BSS_CHANGED_BEACON_ENABLED;
1477                         ieee80211_bss_info_change_notify(sdata, changed);
1478                         break;
1479                 case NL80211_IFTYPE_WDS:
1480                         break;
1481                 case NL80211_IFTYPE_AP_VLAN:
1482                 case NL80211_IFTYPE_MONITOR:
1483                         /* ignore virtual */
1484                         break;
1485                 case NL80211_IFTYPE_P2P_DEVICE:
1486                         changed = BSS_CHANGED_IDLE;
1487                         break;
1488                 case NL80211_IFTYPE_UNSPECIFIED:
1489                 case NUM_NL80211_IFTYPES:
1490                 case NL80211_IFTYPE_P2P_CLIENT:
1491                 case NL80211_IFTYPE_P2P_GO:
1492                         WARN_ON(1);
1493                         break;
1494                 }
1495         }
1496
1497         ieee80211_recalc_ps(local, -1);
1498
1499         /*
1500          * The sta might be in psm against the ap (e.g. because
1501          * this was the state before a hw restart), so we
1502          * explicitly send a null packet in order to make sure
1503          * it'll sync against the ap (and get out of psm).
1504          */
1505         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1506                 list_for_each_entry(sdata, &local->interfaces, list) {
1507                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1508                                 continue;
1509
1510                         ieee80211_send_nullfunc(local, sdata, 0);
1511                 }
1512         }
1513
1514         /* APs are now beaconing, add back stations */
1515         mutex_lock(&local->sta_mtx);
1516         list_for_each_entry(sta, &local->sta_list, list) {
1517                 enum ieee80211_sta_state state;
1518
1519                 if (!sta->uploaded)
1520                         continue;
1521
1522                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1523                         continue;
1524
1525                 for (state = IEEE80211_STA_NOTEXIST;
1526                      state < sta->sta_state; state++)
1527                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1528                                               state + 1));
1529         }
1530         mutex_unlock(&local->sta_mtx);
1531
1532         /* add back keys */
1533         list_for_each_entry(sdata, &local->interfaces, list)
1534                 if (ieee80211_sdata_running(sdata))
1535                         ieee80211_enable_keys(sdata);
1536
1537  wake_up:
1538         local->in_reconfig = false;
1539         barrier();
1540
1541         /*
1542          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1543          * sessions can be established after a resume.
1544          *
1545          * Also tear down aggregation sessions since reconfiguring
1546          * them in a hardware restart scenario is not easily done
1547          * right now, and the hardware will have lost information
1548          * about the sessions, but we and the AP still think they
1549          * are active. This is really a workaround though.
1550          */
1551         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1552                 mutex_lock(&local->sta_mtx);
1553
1554                 list_for_each_entry(sta, &local->sta_list, list) {
1555                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1556                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1557                 }
1558
1559                 mutex_unlock(&local->sta_mtx);
1560         }
1561
1562         ieee80211_wake_queues_by_reason(hw,
1563                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1564
1565         /*
1566          * If this is for hw restart things are still running.
1567          * We may want to change that later, however.
1568          */
1569         if (!local->suspended)
1570                 return 0;
1571
1572 #ifdef CONFIG_PM
1573         /* first set suspended false, then resuming */
1574         local->suspended = false;
1575         mb();
1576         local->resuming = false;
1577
1578         list_for_each_entry(sdata, &local->interfaces, list) {
1579                 switch(sdata->vif.type) {
1580                 case NL80211_IFTYPE_STATION:
1581                         ieee80211_sta_restart(sdata);
1582                         break;
1583                 case NL80211_IFTYPE_ADHOC:
1584                         ieee80211_ibss_restart(sdata);
1585                         break;
1586                 case NL80211_IFTYPE_MESH_POINT:
1587                         ieee80211_mesh_restart(sdata);
1588                         break;
1589                 default:
1590                         break;
1591                 }
1592         }
1593
1594         mod_timer(&local->sta_cleanup, jiffies + 1);
1595
1596         mutex_lock(&local->sta_mtx);
1597         list_for_each_entry(sta, &local->sta_list, list)
1598                 mesh_plink_restart(sta);
1599         mutex_unlock(&local->sta_mtx);
1600 #else
1601         WARN_ON(1);
1602 #endif
1603         return 0;
1604 }
1605
1606 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1607 {
1608         struct ieee80211_sub_if_data *sdata;
1609         struct ieee80211_local *local;
1610         struct ieee80211_key *key;
1611
1612         if (WARN_ON(!vif))
1613                 return;
1614
1615         sdata = vif_to_sdata(vif);
1616         local = sdata->local;
1617
1618         if (WARN_ON(!local->resuming))
1619                 return;
1620
1621         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1622                 return;
1623
1624         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1625
1626         mutex_lock(&local->key_mtx);
1627         list_for_each_entry(key, &sdata->key_list, list)
1628                 key->flags |= KEY_FLAG_TAINTED;
1629         mutex_unlock(&local->key_mtx);
1630 }
1631 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1632
1633 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1634 {
1635         struct ieee80211_local *local = sdata->local;
1636         struct ieee80211_chanctx_conf *chanctx_conf;
1637         struct ieee80211_chanctx *chanctx;
1638
1639         mutex_lock(&local->chanctx_mtx);
1640
1641         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1642                                         lockdep_is_held(&local->chanctx_mtx));
1643
1644         if (WARN_ON_ONCE(!chanctx_conf))
1645                 goto unlock;
1646
1647         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1648         ieee80211_recalc_smps_chanctx(local, chanctx);
1649  unlock:
1650         mutex_unlock(&local->chanctx_mtx);
1651 }
1652
1653 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1654 {
1655         int i;
1656
1657         for (i = 0; i < n_ids; i++)
1658                 if (ids[i] == id)
1659                         return true;
1660         return false;
1661 }
1662
1663 /**
1664  * ieee80211_ie_split - split an IE buffer according to ordering
1665  *
1666  * @ies: the IE buffer
1667  * @ielen: the length of the IE buffer
1668  * @ids: an array with element IDs that are allowed before
1669  *      the split
1670  * @n_ids: the size of the element ID array
1671  * @offset: offset where to start splitting in the buffer
1672  *
1673  * This function splits an IE buffer by updating the @offset
1674  * variable to point to the location where the buffer should be
1675  * split.
1676  *
1677  * It assumes that the given IE buffer is well-formed, this
1678  * has to be guaranteed by the caller!
1679  *
1680  * It also assumes that the IEs in the buffer are ordered
1681  * correctly, if not the result of using this function will not
1682  * be ordered correctly either, i.e. it does no reordering.
1683  *
1684  * The function returns the offset where the next part of the
1685  * buffer starts, which may be @ielen if the entire (remainder)
1686  * of the buffer should be used.
1687  */
1688 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1689                           const u8 *ids, int n_ids, size_t offset)
1690 {
1691         size_t pos = offset;
1692
1693         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1694                 pos += 2 + ies[pos + 1];
1695
1696         return pos;
1697 }
1698
1699 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1700 {
1701         size_t pos = offset;
1702
1703         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1704                 pos += 2 + ies[pos + 1];
1705
1706         return pos;
1707 }
1708
1709 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1710                                             int rssi_min_thold,
1711                                             int rssi_max_thold)
1712 {
1713         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1714
1715         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1716                 return;
1717
1718         /*
1719          * Scale up threshold values before storing it, as the RSSI averaging
1720          * algorithm uses a scaled up value as well. Change this scaling
1721          * factor if the RSSI averaging algorithm changes.
1722          */
1723         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1724         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1725 }
1726
1727 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1728                                     int rssi_min_thold,
1729                                     int rssi_max_thold)
1730 {
1731         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1732
1733         WARN_ON(rssi_min_thold == rssi_max_thold ||
1734                 rssi_min_thold > rssi_max_thold);
1735
1736         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1737                                        rssi_max_thold);
1738 }
1739 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1740
1741 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1742 {
1743         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1744
1745         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1746 }
1747 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1748
1749 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1750                               u16 cap)
1751 {
1752         __le16 tmp;
1753
1754         *pos++ = WLAN_EID_HT_CAPABILITY;
1755         *pos++ = sizeof(struct ieee80211_ht_cap);
1756         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1757
1758         /* capability flags */
1759         tmp = cpu_to_le16(cap);
1760         memcpy(pos, &tmp, sizeof(u16));
1761         pos += sizeof(u16);
1762
1763         /* AMPDU parameters */
1764         *pos++ = ht_cap->ampdu_factor |
1765                  (ht_cap->ampdu_density <<
1766                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1767
1768         /* MCS set */
1769         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1770         pos += sizeof(ht_cap->mcs);
1771
1772         /* extended capabilities */
1773         pos += sizeof(__le16);
1774
1775         /* BF capabilities */
1776         pos += sizeof(__le32);
1777
1778         /* antenna selection */
1779         pos += sizeof(u8);
1780
1781         return pos;
1782 }
1783
1784 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1785                                                            u32 cap)
1786 {
1787         __le32 tmp;
1788
1789         *pos++ = WLAN_EID_VHT_CAPABILITY;
1790         *pos++ = sizeof(struct ieee80211_vht_cap);
1791         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1792
1793         /* capability flags */
1794         tmp = cpu_to_le32(cap);
1795         memcpy(pos, &tmp, sizeof(u32));
1796         pos += sizeof(u32);
1797
1798         /* VHT MCS set */
1799         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1800         pos += sizeof(vht_cap->vht_mcs);
1801
1802         return pos;
1803 }
1804
1805 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1806                                struct ieee80211_channel *channel,
1807                                enum nl80211_channel_type channel_type,
1808                                u16 prot_mode)
1809 {
1810         struct ieee80211_ht_operation *ht_oper;
1811         /* Build HT Information */
1812         *pos++ = WLAN_EID_HT_OPERATION;
1813         *pos++ = sizeof(struct ieee80211_ht_operation);
1814         ht_oper = (struct ieee80211_ht_operation *)pos;
1815         ht_oper->primary_chan =
1816                         ieee80211_frequency_to_channel(channel->center_freq);
1817         switch (channel_type) {
1818         case NL80211_CHAN_HT40MINUS:
1819                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1820                 break;
1821         case NL80211_CHAN_HT40PLUS:
1822                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1823                 break;
1824         case NL80211_CHAN_HT20:
1825         default:
1826                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1827                 break;
1828         }
1829         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1830             channel_type != NL80211_CHAN_NO_HT &&
1831             channel_type != NL80211_CHAN_HT20)
1832                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1833
1834         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1835         ht_oper->stbc_param = 0x0000;
1836
1837         /* It seems that Basic MCS set and Supported MCS set
1838            are identical for the first 10 bytes */
1839         memset(&ht_oper->basic_set, 0, 16);
1840         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1841
1842         return pos + sizeof(struct ieee80211_ht_operation);
1843 }
1844
1845 enum nl80211_channel_type
1846 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1847 {
1848         enum nl80211_channel_type channel_type;
1849
1850         if (!ht_oper)
1851                 return NL80211_CHAN_NO_HT;
1852
1853         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1854         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1855                 channel_type = NL80211_CHAN_HT20;
1856                 break;
1857         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1858                 channel_type = NL80211_CHAN_HT40PLUS;
1859                 break;
1860         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1861                 channel_type = NL80211_CHAN_HT40MINUS;
1862                 break;
1863         default:
1864                 channel_type = NL80211_CHAN_NO_HT;
1865         }
1866
1867         return channel_type;
1868 }
1869
1870 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1871                             struct sk_buff *skb, bool need_basic,
1872                             enum ieee80211_band band)
1873 {
1874         struct ieee80211_local *local = sdata->local;
1875         struct ieee80211_supported_band *sband;
1876         int rate;
1877         u8 i, rates, *pos;
1878         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1879
1880         sband = local->hw.wiphy->bands[band];
1881         rates = sband->n_bitrates;
1882         if (rates > 8)
1883                 rates = 8;
1884
1885         if (skb_tailroom(skb) < rates + 2)
1886                 return -ENOMEM;
1887
1888         pos = skb_put(skb, rates + 2);
1889         *pos++ = WLAN_EID_SUPP_RATES;
1890         *pos++ = rates;
1891         for (i = 0; i < rates; i++) {
1892                 u8 basic = 0;
1893                 if (need_basic && basic_rates & BIT(i))
1894                         basic = 0x80;
1895                 rate = sband->bitrates[i].bitrate;
1896                 *pos++ = basic | (u8) (rate / 5);
1897         }
1898
1899         return 0;
1900 }
1901
1902 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1903                                 struct sk_buff *skb, bool need_basic,
1904                                 enum ieee80211_band band)
1905 {
1906         struct ieee80211_local *local = sdata->local;
1907         struct ieee80211_supported_band *sband;
1908         int rate;
1909         u8 i, exrates, *pos;
1910         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1911
1912         sband = local->hw.wiphy->bands[band];
1913         exrates = sband->n_bitrates;
1914         if (exrates > 8)
1915                 exrates -= 8;
1916         else
1917                 exrates = 0;
1918
1919         if (skb_tailroom(skb) < exrates + 2)
1920                 return -ENOMEM;
1921
1922         if (exrates) {
1923                 pos = skb_put(skb, exrates + 2);
1924                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1925                 *pos++ = exrates;
1926                 for (i = 8; i < sband->n_bitrates; i++) {
1927                         u8 basic = 0;
1928                         if (need_basic && basic_rates & BIT(i))
1929                                 basic = 0x80;
1930                         rate = sband->bitrates[i].bitrate;
1931                         *pos++ = basic | (u8) (rate / 5);
1932                 }
1933         }
1934         return 0;
1935 }
1936
1937 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1938 {
1939         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1940         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1941
1942         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1943                 /* non-managed type inferfaces */
1944                 return 0;
1945         }
1946         return ifmgd->ave_beacon_signal;
1947 }
1948 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
1949
1950 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
1951 {
1952         if (!mcs)
1953                 return 1;
1954
1955         /* TODO: consider rx_highest */
1956
1957         if (mcs->rx_mask[3])
1958                 return 4;
1959         if (mcs->rx_mask[2])
1960                 return 3;
1961         if (mcs->rx_mask[1])
1962                 return 2;
1963         return 1;
1964 }