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                 ieee80211_free_txskb(&local->hw, 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                         ieee80211_free_txskb(&local->hw, 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                 switch (id) {
 647                 case WLAN_EID_SSID:
 648                 case WLAN_EID_SUPP_RATES:
 649                 case WLAN_EID_FH_PARAMS:
 650                 case WLAN_EID_DS_PARAMS:
 651                 case WLAN_EID_CF_PARAMS:
 652                 case WLAN_EID_TIM:
 653                 case WLAN_EID_IBSS_PARAMS:
 654                 case WLAN_EID_CHALLENGE:
 655                 case WLAN_EID_RSN:
 656                 case WLAN_EID_ERP_INFO:
 657                 case WLAN_EID_EXT_SUPP_RATES:
 658                 case WLAN_EID_HT_CAPABILITY:
 659                 case WLAN_EID_HT_OPERATION:
 660                 case WLAN_EID_VHT_CAPABILITY:
 661                 case WLAN_EID_VHT_OPERATION:
 662                 case WLAN_EID_MESH_ID:
 663                 case WLAN_EID_MESH_CONFIG:
 664                 case WLAN_EID_PEER_MGMT:
 665                 case WLAN_EID_PREQ:
 666                 case WLAN_EID_PREP:
 667                 case WLAN_EID_PERR:
 668                 case WLAN_EID_RANN:
 669                 case WLAN_EID_CHANNEL_SWITCH:
 670                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 671                 case WLAN_EID_COUNTRY:
 672                 case WLAN_EID_PWR_CONSTRAINT:
 673                 case WLAN_EID_TIMEOUT_INTERVAL:
 674                         if (test_bit(id, seen_elems)) {
 675                                 elems->parse_error = true;
 676                                 left -= elen;
 677                                 pos += elen;
 678                                 continue;
 679                         }
 680                         break;
 681                 }
 682
 683                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 684                         crc = crc32_be(crc, pos - 2, elen + 2);
 685
 686                 elem_parse_failed = false;
 687
 688                 switch (id) {
 689                 case WLAN_EID_SSID:
 690                         elems->ssid = pos;
 691                         elems->ssid_len = elen;
 692                         break;
 693                 case WLAN_EID_SUPP_RATES:
 694                         elems->supp_rates = pos;
 695                         elems->supp_rates_len = elen;
 696                         break;
 697                 case WLAN_EID_FH_PARAMS:
 698                         elems->fh_params = pos;
 699                         elems->fh_params_len = elen;
 700                         break;
 701                 case WLAN_EID_DS_PARAMS:
 702                         elems->ds_params = pos;
 703                         elems->ds_params_len = elen;
 704                         break;
 705                 case WLAN_EID_CF_PARAMS:
 706                         elems->cf_params = pos;
 707                         elems->cf_params_len = elen;
 708                         break;
 709                 case WLAN_EID_TIM:
 710                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 711                                 elems->tim = (void *)pos;
 712                                 elems->tim_len = elen;
 713                         } else
 714                                 elem_parse_failed = true;
 715                         break;
 716                 case WLAN_EID_IBSS_PARAMS:
 717                         elems->ibss_params = pos;
 718                         elems->ibss_params_len = elen;
 719                         break;
 720                 case WLAN_EID_CHALLENGE:
 721                         elems->challenge = pos;
 722                         elems->challenge_len = elen;
 723                         break;
 724                 case WLAN_EID_VENDOR_SPECIFIC:
 725                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 726                             pos[2] == 0xf2) {
 727                                 /* Microsoft OUI (00:50:F2) */
 728
 729                                 if (calc_crc)
 730                                         crc = crc32_be(crc, pos - 2, elen + 2);
 731
 732                                 if (pos[3] == 1) {
 733                                         /* OUI Type 1 - WPA IE */
 734                                         elems->wpa = pos;
 735                                         elems->wpa_len = elen;
 736                                 } else if (elen >= 5 && pos[3] == 2) {
 737                                         /* OUI Type 2 - WMM IE */
 738                                         if (pos[4] == 0) {
 739                                                 elems->wmm_info = pos;
 740                                                 elems->wmm_info_len = elen;
 741                                         } else if (pos[4] == 1) {
 742                                                 elems->wmm_param = pos;
 743                                                 elems->wmm_param_len = elen;
 744                                         }
 745                                 }
 746                         }
 747                         break;
 748                 case WLAN_EID_RSN:
 749                         elems->rsn = pos;
 750                         elems->rsn_len = elen;
 751                         break;
 752                 case WLAN_EID_ERP_INFO:
 753                         elems->erp_info = pos;
 754                         elems->erp_info_len = elen;
 755                         break;
 756                 case WLAN_EID_EXT_SUPP_RATES:
 757                         elems->ext_supp_rates = pos;
 758                         elems->ext_supp_rates_len = elen;
 759                         break;
 760                 case WLAN_EID_HT_CAPABILITY:
 761                         if (elen >= sizeof(struct ieee80211_ht_cap))
 762                                 elems->ht_cap_elem = (void *)pos;
 763                         else
 764                                 elem_parse_failed = true;
 765                         break;
 766                 case WLAN_EID_HT_OPERATION:
 767                         if (elen >= sizeof(struct ieee80211_ht_operation))
 768                                 elems->ht_operation = (void *)pos;
 769                         else
 770                                 elem_parse_failed = true;
 771                         break;
 772                 case WLAN_EID_MESH_ID:
 773                         elems->mesh_id = pos;
 774                         elems->mesh_id_len = elen;
 775                         break;
 776                 case WLAN_EID_MESH_CONFIG:
 777                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 778                                 elems->mesh_config = (void *)pos;
 779                         else
 780                                 elem_parse_failed = true;
 781                         break;
 782                 case WLAN_EID_PEER_MGMT:
 783                         elems->peering = pos;
 784                         elems->peering_len = elen;
 785                         break;
 786                 case WLAN_EID_PREQ:
 787                         elems->preq = pos;
 788                         elems->preq_len = elen;
 789                         break;
 790                 case WLAN_EID_PREP:
 791                         elems->prep = pos;
 792                         elems->prep_len = elen;
 793                         break;
 794                 case WLAN_EID_PERR:
 795                         elems->perr = pos;
 796                         elems->perr_len = elen;
 797                         break;
 798                 case WLAN_EID_RANN:
 799                         if (elen >= sizeof(struct ieee80211_rann_ie))
 800                                 elems->rann = (void *)pos;
 801                         else
 802                                 elem_parse_failed = true;
 803                         break;
 804                 case WLAN_EID_CHANNEL_SWITCH:
 805                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 806                                 elem_parse_failed = true;
 807                                 break;
 808                         }
 809                         elems->ch_switch_ie = (void *)pos;
 810                         break;
 811                 case WLAN_EID_QUIET:
 812                         if (!elems->quiet_elem) {
 813                                 elems->quiet_elem = pos;
 814                                 elems->quiet_elem_len = elen;
 815                         }
 816                         elems->num_of_quiet_elem++;
 817                         break;
 818                 case WLAN_EID_COUNTRY:
 819                         elems->country_elem = pos;
 820                         elems->country_elem_len = elen;
 821                         break;
 822                 case WLAN_EID_PWR_CONSTRAINT:
 823                         if (elen != 1) {
 824                                 elem_parse_failed = true;
 825                                 break;
 826                         }
 827                         elems->pwr_constr_elem = pos;
 828                         break;
 829                 case WLAN_EID_TIMEOUT_INTERVAL:
 830                         elems->timeout_int = pos;
 831                         elems->timeout_int_len = elen;
 832                         break;
 833                 default:
 834                         break;
 835                 }
 836
 837                 if (elem_parse_failed)
 838                         elems->parse_error = true;
 839                 else
 840                         set_bit(id, seen_elems);
 841
 842                 left -= elen;
 843                 pos += elen;
 844         }
 845
 846         if (left != 0)
 847                 elems->parse_error = true;
 848
 849         return crc;
 850 }
 851
 852 void ieee802_11_parse_elems(u8 *start, size_t len,
 853                             struct ieee802_11_elems *elems)
 854 {
 855         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 856 }
 857
 858 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 859                                bool bss_notify)
 860 {
 861         struct ieee80211_local *local = sdata->local;
 862         struct ieee80211_tx_queue_params qparam;
 863         int ac;
 864         bool use_11b, enable_qos;
 865         int aCWmin, aCWmax;
 866
 867         if (!local->ops->conf_tx)
 868                 return;
 869
 870         if (local->hw.queues < IEEE80211_NUM_ACS)
 871                 return;
 872
 873         memset(&qparam, 0, sizeof(qparam));
 874
 875         use_11b = (local->oper_channel->band == IEEE80211_BAND_2GHZ) &&
 876                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 877
 878         /*
 879          * By default disable QoS in STA mode for old access points, which do
 880          * not support 802.11e. New APs will provide proper queue parameters,
 881          * that we will configure later.
 882          */
 883         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 884
 885         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 886                 /* Set defaults according to 802.11-2007 Table 7-37 */
 887                 aCWmax = 1023;
 888                 if (use_11b)
 889                         aCWmin = 31;
 890                 else
 891                         aCWmin = 15;
 892
 893                 if (enable_qos) {
 894                         switch (ac) {
 895                         case IEEE80211_AC_BK:
 896                                 qparam.cw_max = aCWmax;
 897                                 qparam.cw_min = aCWmin;
 898                                 qparam.txop = 0;
 899                                 qparam.aifs = 7;
 900                                 break;
 901                         /* never happens but let's not leave undefined */
 902                         default:
 903                         case IEEE80211_AC_BE:
 904                                 qparam.cw_max = aCWmax;
 905                                 qparam.cw_min = aCWmin;
 906                                 qparam.txop = 0;
 907                                 qparam.aifs = 3;
 908                                 break;
 909                         case IEEE80211_AC_VI:
 910                                 qparam.cw_max = aCWmin;
 911                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 912                                 if (use_11b)
 913                                         qparam.txop = 6016/32;
 914                                 else
 915                                         qparam.txop = 3008/32;
 916                                 qparam.aifs = 2;
 917                                 break;
 918                         case IEEE80211_AC_VO:
 919                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 920                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 921                                 if (use_11b)
 922                                         qparam.txop = 3264/32;
 923                                 else
 924                                         qparam.txop = 1504/32;
 925                                 qparam.aifs = 2;
 926                                 break;
 927                         }
 928                 } else {
 929                         /* Confiure old 802.11b/g medium access rules. */
 930                         qparam.cw_max = aCWmax;
 931                         qparam.cw_min = aCWmin;
 932                         qparam.txop = 0;
 933                         qparam.aifs = 2;
 934                 }
 935
 936                 qparam.uapsd = false;
 937
 938                 sdata->tx_conf[ac] = qparam;
 939                 drv_conf_tx(local, sdata, ac, &qparam);
 940         }
 941
 942         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 943             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 944                 sdata->vif.bss_conf.qos = enable_qos;
 945                 if (bss_notify)
 946                         ieee80211_bss_info_change_notify(sdata,
 947                                                          BSS_CHANGED_QOS);
 948         }
 949 }
 950
 951 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 952                                   const size_t supp_rates_len,
 953                                   const u8 *supp_rates)
 954 {
 955         struct ieee80211_local *local = sdata->local;
 956         int i, have_higher_than_11mbit = 0;
 957
 958         /* cf. IEEE 802.11 9.2.12 */
 959         for (i = 0; i < supp_rates_len; i++)
 960                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 961                         have_higher_than_11mbit = 1;
 962
 963         if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
 964             have_higher_than_11mbit)
 965                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 966         else
 967                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 968
 969         ieee80211_set_wmm_default(sdata, true);
 970 }
 971
 972 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 973                               enum ieee80211_band band)
 974 {
 975         struct ieee80211_supported_band *sband;
 976         struct ieee80211_rate *bitrates;
 977         u32 mandatory_rates;
 978         enum ieee80211_rate_flags mandatory_flag;
 979         int i;
 980
 981         sband = local->hw.wiphy->bands[band];
 982         if (WARN_ON(!sband))
 983                 return 1;
 984
 985         if (band == IEEE80211_BAND_2GHZ)
 986                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 987         else
 988                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 989
 990         bitrates = sband->bitrates;
 991         mandatory_rates = 0;
 992         for (i = 0; i < sband->n_bitrates; i++)
 993                 if (bitrates[i].flags & mandatory_flag)
 994                         mandatory_rates |= BIT(i);
 995         return mandatory_rates;
 996 }
 997
 998 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 999                          u16 transaction, u16 auth_alg,
1000                          u8 *extra, size_t extra_len, const u8 *da,
1001                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
1002 {
1003         struct ieee80211_local *local = sdata->local;
1004         struct sk_buff *skb;
1005         struct ieee80211_mgmt *mgmt;
1006         int err;
1007
1008         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1009                             sizeof(*mgmt) + 6 + extra_len);
1010         if (!skb)
1011                 return;
1012
1013         skb_reserve(skb, local->hw.extra_tx_headroom);
1014
1015         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1016         memset(mgmt, 0, 24 + 6);
1017         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1018                                           IEEE80211_STYPE_AUTH);
1019         memcpy(mgmt->da, da, ETH_ALEN);
1020         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1021         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1022         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1023         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1024         mgmt->u.auth.status_code = cpu_to_le16(0);
1025         if (extra)
1026                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1027
1028         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1029                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1030                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1031                 WARN_ON(err);
1032         }
1033
1034         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1035         ieee80211_tx_skb(sdata, skb);
1036 }
1037
1038 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1039                                     const u8 *bssid, u16 stype, u16 reason,
1040                                     bool send_frame, u8 *frame_buf)
1041 {
1042         struct ieee80211_local *local = sdata->local;
1043         struct sk_buff *skb;
1044         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1045
1046         /* build frame */
1047         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1048         mgmt->duration = 0; /* initialize only */
1049         mgmt->seq_ctrl = 0; /* initialize only */
1050         memcpy(mgmt->da, bssid, ETH_ALEN);
1051         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1052         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1053         /* u.deauth.reason_code == u.disassoc.reason_code */
1054         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1055
1056         if (send_frame) {
1057                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1058                                     IEEE80211_DEAUTH_FRAME_LEN);
1059                 if (!skb)
1060                         return;
1061
1062                 skb_reserve(skb, local->hw.extra_tx_headroom);
1063
1064                 /* copy in frame */
1065                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1066                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1067
1068                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1069                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1070                         IEEE80211_SKB_CB(skb)->flags |=
1071                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1072
1073                 ieee80211_tx_skb(sdata, skb);
1074         }
1075 }
1076
1077 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1078                              const u8 *ie, size_t ie_len,
1079                              enum ieee80211_band band, u32 rate_mask,
1080                              u8 channel)
1081 {
1082         struct ieee80211_supported_band *sband;
1083         u8 *pos;
1084         size_t offset = 0, noffset;
1085         int supp_rates_len, i;
1086         u8 rates[32];
1087         int num_rates;
1088         int ext_rates_len;
1089
1090         sband = local->hw.wiphy->bands[band];
1091         if (WARN_ON_ONCE(!sband))
1092                 return 0;
1093
1094         pos = buffer;
1095
1096         num_rates = 0;
1097         for (i = 0; i < sband->n_bitrates; i++) {
1098                 if ((BIT(i) & rate_mask) == 0)
1099                         continue; /* skip rate */
1100                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1101         }
1102
1103         supp_rates_len = min_t(int, num_rates, 8);
1104
1105         *pos++ = WLAN_EID_SUPP_RATES;
1106         *pos++ = supp_rates_len;
1107         memcpy(pos, rates, supp_rates_len);
1108         pos += supp_rates_len;
1109
1110         /* insert "request information" if in custom IEs */
1111         if (ie && ie_len) {
1112                 static const u8 before_extrates[] = {
1113                         WLAN_EID_SSID,
1114                         WLAN_EID_SUPP_RATES,
1115                         WLAN_EID_REQUEST,
1116                 };
1117                 noffset = ieee80211_ie_split(ie, ie_len,
1118                                              before_extrates,
1119                                              ARRAY_SIZE(before_extrates),
1120                                              offset);
1121                 memcpy(pos, ie + offset, noffset - offset);
1122                 pos += noffset - offset;
1123                 offset = noffset;
1124         }
1125
1126         ext_rates_len = num_rates - supp_rates_len;
1127         if (ext_rates_len > 0) {
1128                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1129                 *pos++ = ext_rates_len;
1130                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1131                 pos += ext_rates_len;
1132         }
1133
1134         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1135                 *pos++ = WLAN_EID_DS_PARAMS;
1136                 *pos++ = 1;
1137                 *pos++ = channel;
1138         }
1139
1140         /* insert custom IEs that go before HT */
1141         if (ie && ie_len) {
1142                 static const u8 before_ht[] = {
1143                         WLAN_EID_SSID,
1144                         WLAN_EID_SUPP_RATES,
1145                         WLAN_EID_REQUEST,
1146                         WLAN_EID_EXT_SUPP_RATES,
1147                         WLAN_EID_DS_PARAMS,
1148                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1149                 };
1150                 noffset = ieee80211_ie_split(ie, ie_len,
1151                                              before_ht, ARRAY_SIZE(before_ht),
1152                                              offset);
1153                 memcpy(pos, ie + offset, noffset - offset);
1154                 pos += noffset - offset;
1155                 offset = noffset;
1156         }
1157
1158         if (sband->ht_cap.ht_supported)
1159                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1160                                                 sband->ht_cap.cap);
1161
1162         /*
1163          * If adding more here, adjust code in main.c
1164          * that calculates local->scan_ies_len.
1165          */
1166
1167         /* add any remaining custom IEs */
1168         if (ie && ie_len) {
1169                 noffset = ie_len;
1170                 memcpy(pos, ie + offset, noffset - offset);
1171                 pos += noffset - offset;
1172         }
1173
1174         if (sband->vht_cap.vht_supported)
1175                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1176                                                  sband->vht_cap.cap);
1177
1178         return pos - buffer;
1179 }
1180
1181 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1182                                           u8 *dst, u32 ratemask,
1183                                           struct ieee80211_channel *chan,
1184                                           const u8 *ssid, size_t ssid_len,
1185                                           const u8 *ie, size_t ie_len,
1186                                           bool directed)
1187 {
1188         struct ieee80211_local *local = sdata->local;
1189         struct sk_buff *skb;
1190         struct ieee80211_mgmt *mgmt;
1191         size_t buf_len;
1192         u8 *buf;
1193         u8 chan_no;
1194
1195         /* FIXME: come up with a proper value */
1196         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1197         if (!buf)
1198                 return NULL;
1199
1200         /*
1201          * Do not send DS Channel parameter for directed probe requests
1202          * in order to maximize the chance that we get a response.  Some
1203          * badly-behaved APs don't respond when this parameter is included.
1204          */
1205         if (directed)
1206                 chan_no = 0;
1207         else
1208                 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1209
1210         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, chan->band,
1211                                            ratemask, chan_no);
1212
1213         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1214                                      ssid, ssid_len,
1215                                      buf, buf_len);
1216         if (!skb)
1217                 goto out;
1218
1219         if (dst) {
1220                 mgmt = (struct ieee80211_mgmt *) skb->data;
1221                 memcpy(mgmt->da, dst, ETH_ALEN);
1222                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1223         }
1224
1225         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1226
1227  out:
1228         kfree(buf);
1229
1230         return skb;
1231 }
1232
1233 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1234                               const u8 *ssid, size_t ssid_len,
1235                               const u8 *ie, size_t ie_len,
1236                               u32 ratemask, bool directed, bool no_cck,
1237                               struct ieee80211_channel *channel)
1238 {
1239         struct sk_buff *skb;
1240
1241         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1242                                         ssid, ssid_len,
1243                                         ie, ie_len, directed);
1244         if (skb) {
1245                 if (no_cck)
1246                         IEEE80211_SKB_CB(skb)->flags |=
1247                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1248                 ieee80211_tx_skb(sdata, skb);
1249         }
1250 }
1251
1252 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1253                             struct ieee802_11_elems *elems,
1254                             enum ieee80211_band band, u32 *basic_rates)
1255 {
1256         struct ieee80211_supported_band *sband;
1257         struct ieee80211_rate *bitrates;
1258         size_t num_rates;
1259         u32 supp_rates;
1260         int i, j;
1261         sband = local->hw.wiphy->bands[band];
1262
1263         if (WARN_ON(!sband))
1264                 return 1;
1265
1266         bitrates = sband->bitrates;
1267         num_rates = sband->n_bitrates;
1268         supp_rates = 0;
1269         for (i = 0; i < elems->supp_rates_len +
1270                      elems->ext_supp_rates_len; i++) {
1271                 u8 rate = 0;
1272                 int own_rate;
1273                 bool is_basic;
1274                 if (i < elems->supp_rates_len)
1275                         rate = elems->supp_rates[i];
1276                 else if (elems->ext_supp_rates)
1277                         rate = elems->ext_supp_rates
1278                                 [i - elems->supp_rates_len];
1279                 own_rate = 5 * (rate & 0x7f);
1280                 is_basic = !!(rate & 0x80);
1281
1282                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1283                         continue;
1284
1285                 for (j = 0; j < num_rates; j++) {
1286                         if (bitrates[j].bitrate == own_rate) {
1287                                 supp_rates |= BIT(j);
1288                                 if (basic_rates && is_basic)
1289                                         *basic_rates |= BIT(j);
1290                         }
1291                 }
1292         }
1293         return supp_rates;
1294 }
1295
1296 void ieee80211_stop_device(struct ieee80211_local *local)
1297 {
1298         ieee80211_led_radio(local, false);
1299         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1300
1301         cancel_work_sync(&local->reconfig_filter);
1302
1303         flush_workqueue(local->workqueue);
1304         drv_stop(local);
1305 }
1306
1307 int ieee80211_reconfig(struct ieee80211_local *local)
1308 {
1309         struct ieee80211_hw *hw = &local->hw;
1310         struct ieee80211_sub_if_data *sdata;
1311         struct sta_info *sta;
1312         int res, i;
1313
1314 #ifdef CONFIG_PM
1315         if (local->suspended)
1316                 local->resuming = true;
1317
1318         if (local->wowlan) {
1319                 local->wowlan = false;
1320                 res = drv_resume(local);
1321                 if (res < 0) {
1322                         local->resuming = false;
1323                         return res;
1324                 }
1325                 if (res == 0)
1326                         goto wake_up;
1327                 WARN_ON(res > 1);
1328                 /*
1329                  * res is 1, which means the driver requested
1330                  * to go through a regular reset on wakeup.
1331                  */
1332         }
1333 #endif
1334         /* everything else happens only if HW was up & running */
1335         if (!local->open_count)
1336                 goto wake_up;
1337
1338         /*
1339          * Upon resume hardware can sometimes be goofy due to
1340          * various platform / driver / bus issues, so restarting
1341          * the device may at times not work immediately. Propagate
1342          * the error.
1343          */
1344         res = drv_start(local);
1345         if (res) {
1346                 WARN(local->suspended, "Hardware became unavailable "
1347                      "upon resume. This could be a software issue "
1348                      "prior to suspend or a hardware issue.\n");
1349                 return res;
1350         }
1351
1352         /* setup fragmentation threshold */
1353         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1354
1355         /* setup RTS threshold */
1356         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1357
1358         /* reset coverage class */
1359         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1360
1361         ieee80211_led_radio(local, true);
1362         ieee80211_mod_tpt_led_trig(local,
1363                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1364
1365         /* add interfaces */
1366         sdata = rtnl_dereference(local->monitor_sdata);
1367         if (sdata) {
1368                 res = drv_add_interface(local, sdata);
1369                 if (WARN_ON(res)) {
1370                         rcu_assign_pointer(local->monitor_sdata, NULL);
1371                         synchronize_net();
1372                         kfree(sdata);
1373                 }
1374         }
1375
1376         list_for_each_entry(sdata, &local->interfaces, list) {
1377                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1378                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1379                     ieee80211_sdata_running(sdata))
1380                         res = drv_add_interface(local, sdata);
1381         }
1382
1383         /* add STAs back */
1384         mutex_lock(&local->sta_mtx);
1385         list_for_each_entry(sta, &local->sta_list, list) {
1386                 enum ieee80211_sta_state state;
1387
1388                 if (!sta->uploaded)
1389                         continue;
1390
1391                 /* AP-mode stations will be added later */
1392                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1393                         continue;
1394
1395                 for (state = IEEE80211_STA_NOTEXIST;
1396                      state < sta->sta_state; state++)
1397                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1398                                               state + 1));
1399         }
1400         mutex_unlock(&local->sta_mtx);
1401
1402         /* reconfigure tx conf */
1403         if (hw->queues >= IEEE80211_NUM_ACS) {
1404                 list_for_each_entry(sdata, &local->interfaces, list) {
1405                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1406                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1407                             !ieee80211_sdata_running(sdata))
1408                                 continue;
1409
1410                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1411                                 drv_conf_tx(local, sdata, i,
1412                                             &sdata->tx_conf[i]);
1413                 }
1414         }
1415
1416         /* reconfigure hardware */
1417         ieee80211_hw_config(local, ~0);
1418
1419         ieee80211_configure_filter(local);
1420
1421         /* Finally also reconfigure all the BSS information */
1422         list_for_each_entry(sdata, &local->interfaces, list) {
1423                 u32 changed;
1424
1425                 if (!ieee80211_sdata_running(sdata))
1426                         continue;
1427
1428                 /* common change flags for all interface types */
1429                 changed = BSS_CHANGED_ERP_CTS_PROT |
1430                           BSS_CHANGED_ERP_PREAMBLE |
1431                           BSS_CHANGED_ERP_SLOT |
1432                           BSS_CHANGED_HT |
1433                           BSS_CHANGED_BASIC_RATES |
1434                           BSS_CHANGED_BEACON_INT |
1435                           BSS_CHANGED_BSSID |
1436                           BSS_CHANGED_CQM |
1437                           BSS_CHANGED_QOS |
1438                           BSS_CHANGED_IDLE;
1439
1440                 switch (sdata->vif.type) {
1441                 case NL80211_IFTYPE_STATION:
1442                         changed |= BSS_CHANGED_ASSOC |
1443                                    BSS_CHANGED_ARP_FILTER |
1444                                    BSS_CHANGED_PS;
1445                         mutex_lock(&sdata->u.mgd.mtx);
1446                         ieee80211_bss_info_change_notify(sdata, changed);
1447                         mutex_unlock(&sdata->u.mgd.mtx);
1448                         break;
1449                 case NL80211_IFTYPE_ADHOC:
1450                         changed |= BSS_CHANGED_IBSS;
1451                         /* fall through */
1452                 case NL80211_IFTYPE_AP:
1453                         changed |= BSS_CHANGED_SSID;
1454
1455                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1456                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1457
1458                         /* fall through */
1459                 case NL80211_IFTYPE_MESH_POINT:
1460                         changed |= BSS_CHANGED_BEACON |
1461                                    BSS_CHANGED_BEACON_ENABLED;
1462                         ieee80211_bss_info_change_notify(sdata, changed);
1463                         break;
1464                 case NL80211_IFTYPE_WDS:
1465                         break;
1466                 case NL80211_IFTYPE_AP_VLAN:
1467                 case NL80211_IFTYPE_MONITOR:
1468                         /* ignore virtual */
1469                         break;
1470                 case NL80211_IFTYPE_P2P_DEVICE:
1471                         changed = BSS_CHANGED_IDLE;
1472                         break;
1473                 case NL80211_IFTYPE_UNSPECIFIED:
1474                 case NUM_NL80211_IFTYPES:
1475                 case NL80211_IFTYPE_P2P_CLIENT:
1476                 case NL80211_IFTYPE_P2P_GO:
1477                         WARN_ON(1);
1478                         break;
1479                 }
1480         }
1481
1482         ieee80211_recalc_ps(local, -1);
1483
1484         /*
1485          * The sta might be in psm against the ap (e.g. because
1486          * this was the state before a hw restart), so we
1487          * explicitly send a null packet in order to make sure
1488          * it'll sync against the ap (and get out of psm).
1489          */
1490         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1491                 list_for_each_entry(sdata, &local->interfaces, list) {
1492                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1493                                 continue;
1494
1495                         ieee80211_send_nullfunc(local, sdata, 0);
1496                 }
1497         }
1498
1499         /* APs are now beaconing, add back stations */
1500         mutex_lock(&local->sta_mtx);
1501         list_for_each_entry(sta, &local->sta_list, list) {
1502                 enum ieee80211_sta_state state;
1503
1504                 if (!sta->uploaded)
1505                         continue;
1506
1507                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1508                         continue;
1509
1510                 for (state = IEEE80211_STA_NOTEXIST;
1511                      state < sta->sta_state; state++)
1512                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1513                                               state + 1));
1514         }
1515         mutex_unlock(&local->sta_mtx);
1516
1517         /* add back keys */
1518         list_for_each_entry(sdata, &local->interfaces, list)
1519                 if (ieee80211_sdata_running(sdata))
1520                         ieee80211_enable_keys(sdata);
1521
1522  wake_up:
1523         local->in_reconfig = false;
1524         barrier();
1525
1526         /*
1527          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1528          * sessions can be established after a resume.
1529          *
1530          * Also tear down aggregation sessions since reconfiguring
1531          * them in a hardware restart scenario is not easily done
1532          * right now, and the hardware will have lost information
1533          * about the sessions, but we and the AP still think they
1534          * are active. This is really a workaround though.
1535          */
1536         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1537                 mutex_lock(&local->sta_mtx);
1538
1539                 list_for_each_entry(sta, &local->sta_list, list) {
1540                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1541                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1542                 }
1543
1544                 mutex_unlock(&local->sta_mtx);
1545         }
1546
1547         ieee80211_wake_queues_by_reason(hw,
1548                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1549
1550         /*
1551          * If this is for hw restart things are still running.
1552          * We may want to change that later, however.
1553          */
1554         if (!local->suspended)
1555                 return 0;
1556
1557 #ifdef CONFIG_PM
1558         /* first set suspended false, then resuming */
1559         local->suspended = false;
1560         mb();
1561         local->resuming = false;
1562
1563         list_for_each_entry(sdata, &local->interfaces, list) {
1564                 switch(sdata->vif.type) {
1565                 case NL80211_IFTYPE_STATION:
1566                         ieee80211_sta_restart(sdata);
1567                         break;
1568                 case NL80211_IFTYPE_ADHOC:
1569                         ieee80211_ibss_restart(sdata);
1570                         break;
1571                 case NL80211_IFTYPE_MESH_POINT:
1572                         ieee80211_mesh_restart(sdata);
1573                         break;
1574                 default:
1575                         break;
1576                 }
1577         }
1578
1579         mod_timer(&local->sta_cleanup, jiffies + 1);
1580
1581         mutex_lock(&local->sta_mtx);
1582         list_for_each_entry(sta, &local->sta_list, list)
1583                 mesh_plink_restart(sta);
1584         mutex_unlock(&local->sta_mtx);
1585 #else
1586         WARN_ON(1);
1587 #endif
1588         return 0;
1589 }
1590
1591 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1592 {
1593         struct ieee80211_sub_if_data *sdata;
1594         struct ieee80211_local *local;
1595         struct ieee80211_key *key;
1596
1597         if (WARN_ON(!vif))
1598                 return;
1599
1600         sdata = vif_to_sdata(vif);
1601         local = sdata->local;
1602
1603         if (WARN_ON(!local->resuming))
1604                 return;
1605
1606         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1607                 return;
1608
1609         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1610
1611         mutex_lock(&local->key_mtx);
1612         list_for_each_entry(key, &sdata->key_list, list)
1613                 key->flags |= KEY_FLAG_TAINTED;
1614         mutex_unlock(&local->key_mtx);
1615 }
1616 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1617
1618 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1619                           enum ieee80211_smps_mode *smps_mode)
1620 {
1621         if (ifmgd->associated) {
1622                 *smps_mode = ifmgd->ap_smps;
1623
1624                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1625                         if (ifmgd->powersave)
1626                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1627                         else
1628                                 *smps_mode = IEEE80211_SMPS_OFF;
1629                 }
1630
1631                 return 1;
1632         }
1633
1634         return 0;
1635 }
1636
1637 void ieee80211_recalc_smps(struct ieee80211_local *local)
1638 {
1639         struct ieee80211_sub_if_data *sdata;
1640         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1641         int count = 0;
1642
1643         mutex_lock(&local->iflist_mtx);
1644
1645         /*
1646          * This function could be improved to handle multiple
1647          * interfaces better, but right now it makes any
1648          * non-station interfaces force SM PS to be turned
1649          * off. If there are multiple station interfaces it
1650          * could also use the best possible mode, e.g. if
1651          * one is in static and the other in dynamic then
1652          * dynamic is ok.
1653          */
1654
1655         list_for_each_entry(sdata, &local->interfaces, list) {
1656                 if (!ieee80211_sdata_running(sdata))
1657                         continue;
1658                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
1659                         continue;
1660                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1661                         goto set;
1662
1663                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1664
1665                 if (count > 1) {
1666                         smps_mode = IEEE80211_SMPS_OFF;
1667                         break;
1668                 }
1669         }
1670
1671         if (smps_mode == local->smps_mode)
1672                 goto unlock;
1673
1674  set:
1675         local->smps_mode = smps_mode;
1676         /* changed flag is auto-detected for this */
1677         ieee80211_hw_config(local, 0);
1678  unlock:
1679         mutex_unlock(&local->iflist_mtx);
1680 }
1681
1682 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1683 {
1684         int i;
1685
1686         for (i = 0; i < n_ids; i++)
1687                 if (ids[i] == id)
1688                         return true;
1689         return false;
1690 }
1691
1692 /**
1693  * ieee80211_ie_split - split an IE buffer according to ordering
1694  *
1695  * @ies: the IE buffer
1696  * @ielen: the length of the IE buffer
1697  * @ids: an array with element IDs that are allowed before
1698  *      the split
1699  * @n_ids: the size of the element ID array
1700  * @offset: offset where to start splitting in the buffer
1701  *
1702  * This function splits an IE buffer by updating the @offset
1703  * variable to point to the location where the buffer should be
1704  * split.
1705  *
1706  * It assumes that the given IE buffer is well-formed, this
1707  * has to be guaranteed by the caller!
1708  *
1709  * It also assumes that the IEs in the buffer are ordered
1710  * correctly, if not the result of using this function will not
1711  * be ordered correctly either, i.e. it does no reordering.
1712  *
1713  * The function returns the offset where the next part of the
1714  * buffer starts, which may be @ielen if the entire (remainder)
1715  * of the buffer should be used.
1716  */
1717 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1718                           const u8 *ids, int n_ids, size_t offset)
1719 {
1720         size_t pos = offset;
1721
1722         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1723                 pos += 2 + ies[pos + 1];
1724
1725         return pos;
1726 }
1727
1728 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1729 {
1730         size_t pos = offset;
1731
1732         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1733                 pos += 2 + ies[pos + 1];
1734
1735         return pos;
1736 }
1737
1738 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1739                                             int rssi_min_thold,
1740                                             int rssi_max_thold)
1741 {
1742         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1743
1744         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1745                 return;
1746
1747         /*
1748          * Scale up threshold values before storing it, as the RSSI averaging
1749          * algorithm uses a scaled up value as well. Change this scaling
1750          * factor if the RSSI averaging algorithm changes.
1751          */
1752         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1753         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1754 }
1755
1756 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1757                                     int rssi_min_thold,
1758                                     int rssi_max_thold)
1759 {
1760         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1761
1762         WARN_ON(rssi_min_thold == rssi_max_thold ||
1763                 rssi_min_thold > rssi_max_thold);
1764
1765         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1766                                        rssi_max_thold);
1767 }
1768 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1769
1770 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1771 {
1772         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1773
1774         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1775 }
1776 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1777
1778 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1779                               u16 cap)
1780 {
1781         __le16 tmp;
1782
1783         *pos++ = WLAN_EID_HT_CAPABILITY;
1784         *pos++ = sizeof(struct ieee80211_ht_cap);
1785         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1786
1787         /* capability flags */
1788         tmp = cpu_to_le16(cap);
1789         memcpy(pos, &tmp, sizeof(u16));
1790         pos += sizeof(u16);
1791
1792         /* AMPDU parameters */
1793         *pos++ = ht_cap->ampdu_factor |
1794                  (ht_cap->ampdu_density <<
1795                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1796
1797         /* MCS set */
1798         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1799         pos += sizeof(ht_cap->mcs);
1800
1801         /* extended capabilities */
1802         pos += sizeof(__le16);
1803
1804         /* BF capabilities */
1805         pos += sizeof(__le32);
1806
1807         /* antenna selection */
1808         pos += sizeof(u8);
1809
1810         return pos;
1811 }
1812
1813 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1814                                                            u32 cap)
1815 {
1816         __le32 tmp;
1817
1818         *pos++ = WLAN_EID_VHT_CAPABILITY;
1819         *pos++ = sizeof(struct ieee80211_vht_capabilities);
1820         memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1821
1822         /* capability flags */
1823         tmp = cpu_to_le32(cap);
1824         memcpy(pos, &tmp, sizeof(u32));
1825         pos += sizeof(u32);
1826
1827         /* VHT MCS set */
1828         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1829         pos += sizeof(vht_cap->vht_mcs);
1830
1831         return pos;
1832 }
1833
1834 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1835                                struct ieee80211_channel *channel,
1836                                enum nl80211_channel_type channel_type,
1837                                u16 prot_mode)
1838 {
1839         struct ieee80211_ht_operation *ht_oper;
1840         /* Build HT Information */
1841         *pos++ = WLAN_EID_HT_OPERATION;
1842         *pos++ = sizeof(struct ieee80211_ht_operation);
1843         ht_oper = (struct ieee80211_ht_operation *)pos;
1844         ht_oper->primary_chan =
1845                         ieee80211_frequency_to_channel(channel->center_freq);
1846         switch (channel_type) {
1847         case NL80211_CHAN_HT40MINUS:
1848                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1849                 break;
1850         case NL80211_CHAN_HT40PLUS:
1851                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1852                 break;
1853         case NL80211_CHAN_HT20:
1854         default:
1855                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1856                 break;
1857         }
1858         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1859             channel_type != NL80211_CHAN_NO_HT &&
1860             channel_type != NL80211_CHAN_HT20)
1861                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1862
1863         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1864         ht_oper->stbc_param = 0x0000;
1865
1866         /* It seems that Basic MCS set and Supported MCS set
1867            are identical for the first 10 bytes */
1868         memset(&ht_oper->basic_set, 0, 16);
1869         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1870
1871         return pos + sizeof(struct ieee80211_ht_operation);
1872 }
1873
1874 enum nl80211_channel_type
1875 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1876 {
1877         enum nl80211_channel_type channel_type;
1878
1879         if (!ht_oper)
1880                 return NL80211_CHAN_NO_HT;
1881
1882         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1883         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1884                 channel_type = NL80211_CHAN_HT20;
1885                 break;
1886         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1887                 channel_type = NL80211_CHAN_HT40PLUS;
1888                 break;
1889         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1890                 channel_type = NL80211_CHAN_HT40MINUS;
1891                 break;
1892         default:
1893                 channel_type = NL80211_CHAN_NO_HT;
1894         }
1895
1896         return channel_type;
1897 }
1898
1899 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1900                             struct sk_buff *skb, bool need_basic,
1901                             enum ieee80211_band band)
1902 {
1903         struct ieee80211_local *local = sdata->local;
1904         struct ieee80211_supported_band *sband;
1905         int rate;
1906         u8 i, rates, *pos;
1907         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1908
1909         sband = local->hw.wiphy->bands[band];
1910         rates = sband->n_bitrates;
1911         if (rates > 8)
1912                 rates = 8;
1913
1914         if (skb_tailroom(skb) < rates + 2)
1915                 return -ENOMEM;
1916
1917         pos = skb_put(skb, rates + 2);
1918         *pos++ = WLAN_EID_SUPP_RATES;
1919         *pos++ = rates;
1920         for (i = 0; i < rates; i++) {
1921                 u8 basic = 0;
1922                 if (need_basic && basic_rates & BIT(i))
1923                         basic = 0x80;
1924                 rate = sband->bitrates[i].bitrate;
1925                 *pos++ = basic | (u8) (rate / 5);
1926         }
1927
1928         return 0;
1929 }
1930
1931 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1932                                 struct sk_buff *skb, bool need_basic,
1933                                 enum ieee80211_band band)
1934 {
1935         struct ieee80211_local *local = sdata->local;
1936         struct ieee80211_supported_band *sband;
1937         int rate;
1938         u8 i, exrates, *pos;
1939         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1940
1941         sband = local->hw.wiphy->bands[band];
1942         exrates = sband->n_bitrates;
1943         if (exrates > 8)
1944                 exrates -= 8;
1945         else
1946                 exrates = 0;
1947
1948         if (skb_tailroom(skb) < exrates + 2)
1949                 return -ENOMEM;
1950
1951         if (exrates) {
1952                 pos = skb_put(skb, exrates + 2);
1953                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1954                 *pos++ = exrates;
1955                 for (i = 8; i < sband->n_bitrates; i++) {
1956                         u8 basic = 0;
1957                         if (need_basic && basic_rates & BIT(i))
1958                                 basic = 0x80;
1959                         rate = sband->bitrates[i].bitrate;
1960                         *pos++ = basic | (u8) (rate / 5);
1961                 }
1962         }
1963         return 0;
1964 }
1965
1966 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1967 {
1968         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1969         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1970
1971         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1972                 /* non-managed type inferfaces */
1973                 return 0;
1974         }
1975         return ifmgd->ave_beacon_signal;
1976 }
1977 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);