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  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright (C) 2015   Intel Deutschland GmbH
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * utilities for mac80211
  14  */
  15
  16 #include <net/mac80211.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/export.h>
  19 #include <linux/types.h>
  20 #include <linux/slab.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/bitmap.h>
  25 #include <linux/crc32.h>
  26 #include <net/net_namespace.h>
  27 #include <net/cfg80211.h>
  28 #include <net/rtnetlink.h>
  29
  30 #include "ieee80211_i.h"
  31 #include "driver-ops.h"
  32 #include "rate.h"
  33 #include "mesh.h"
  34 #include "wme.h"
  35 #include "led.h"
  36 #include "wep.h"
  37
  38 /* privid for wiphys to determine whether they belong to us or not */
  39 const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid;
  40
  41 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  42 {
  43         struct ieee80211_local *local;
  44         BUG_ON(!wiphy);
  45
  46         local = wiphy_priv(wiphy);
  47         return &local->hw;
  48 }
  49 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  50
  51 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  52 {
  53         struct sk_buff *skb;
  54         struct ieee80211_hdr *hdr;
  55
  56         skb_queue_walk(&tx->skbs, skb) {
  57                 hdr = (struct ieee80211_hdr *) skb->data;
  58                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
  59         }
  60 }
  61
  62 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
  63                              int rate, int erp, int short_preamble,
  64                              int shift)
  65 {
  66         int dur;
  67
  68         /* calculate duration (in microseconds, rounded up to next higher
  69          * integer if it includes a fractional microsecond) to send frame of
  70          * len bytes (does not include FCS) at the given rate. Duration will
  71          * also include SIFS.
  72          *
  73          * rate is in 100 kbps, so divident is multiplied by 10 in the
  74          * DIV_ROUND_UP() operations.
  75          *
  76          * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
  77          * is assumed to be 0 otherwise.
  78          */
  79
  80         if (band == IEEE80211_BAND_5GHZ || erp) {
  81                 /*
  82                  * OFDM:
  83                  *
  84                  * N_DBPS = DATARATE x 4
  85                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
  86                  *      (16 = SIGNAL time, 6 = tail bits)
  87                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
  88                  *
  89                  * T_SYM = 4 usec
  90                  * 802.11a - 18.5.2: aSIFSTime = 16 usec
  91                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
  92                  *      signal ext = 6 usec
  93                  */
  94                 dur = 16; /* SIFS + signal ext */
  95                 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
  96                 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
  97
  98                 /* IEEE 802.11-2012 18.3.2.4: all values above are:
  99                  *  * times 4 for 5 MHz
 100                  *  * times 2 for 10 MHz
 101                  */
 102                 dur *= 1 << shift;
 103
 104                 /* rates should already consider the channel bandwidth,
 105                  * don't apply divisor again.
 106                  */
 107                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 108                                         4 * rate); /* T_SYM x N_SYM */
 109         } else {
 110                 /*
 111                  * 802.11b or 802.11g with 802.11b compatibility:
 112                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 113                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 114                  *
 115                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 116                  * aSIFSTime = 10 usec
 117                  * aPreambleLength = 144 usec or 72 usec with short preamble
 118                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 119                  */
 120                 dur = 10; /* aSIFSTime = 10 usec */
 121                 dur += short_preamble ? (72 + 24) : (144 + 48);
 122
 123                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 124         }
 125
 126         return dur;
 127 }
 128
 129 /* Exported duration function for driver use */
 130 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 131                                         struct ieee80211_vif *vif,
 132                                         enum ieee80211_band band,
 133                                         size_t frame_len,
 134                                         struct ieee80211_rate *rate)
 135 {
 136         struct ieee80211_sub_if_data *sdata;
 137         u16 dur;
 138         int erp, shift = 0;
 139         bool short_preamble = false;
 140
 141         erp = 0;
 142         if (vif) {
 143                 sdata = vif_to_sdata(vif);
 144                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 145                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 146                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 147                 shift = ieee80211_vif_get_shift(vif);
 148         }
 149
 150         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 151                                        short_preamble, shift);
 152
 153         return cpu_to_le16(dur);
 154 }
 155 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 156
 157 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 158                               struct ieee80211_vif *vif, size_t frame_len,
 159                               const struct ieee80211_tx_info *frame_txctl)
 160 {
 161         struct ieee80211_local *local = hw_to_local(hw);
 162         struct ieee80211_rate *rate;
 163         struct ieee80211_sub_if_data *sdata;
 164         bool short_preamble;
 165         int erp, shift = 0, bitrate;
 166         u16 dur;
 167         struct ieee80211_supported_band *sband;
 168
 169         sband = local->hw.wiphy->bands[frame_txctl->band];
 170
 171         short_preamble = false;
 172
 173         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 174
 175         erp = 0;
 176         if (vif) {
 177                 sdata = vif_to_sdata(vif);
 178                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 179                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 180                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 181                 shift = ieee80211_vif_get_shift(vif);
 182         }
 183
 184         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 185
 186         /* CTS duration */
 187         dur = ieee80211_frame_duration(sband->band, 10, bitrate,
 188                                        erp, short_preamble, shift);
 189         /* Data frame duration */
 190         dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
 191                                         erp, short_preamble, shift);
 192         /* ACK duration */
 193         dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 194                                         erp, short_preamble, shift);
 195
 196         return cpu_to_le16(dur);
 197 }
 198 EXPORT_SYMBOL(ieee80211_rts_duration);
 199
 200 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 201                                     struct ieee80211_vif *vif,
 202                                     size_t frame_len,
 203                                     const struct ieee80211_tx_info *frame_txctl)
 204 {
 205         struct ieee80211_local *local = hw_to_local(hw);
 206         struct ieee80211_rate *rate;
 207         struct ieee80211_sub_if_data *sdata;
 208         bool short_preamble;
 209         int erp, shift = 0, bitrate;
 210         u16 dur;
 211         struct ieee80211_supported_band *sband;
 212
 213         sband = local->hw.wiphy->bands[frame_txctl->band];
 214
 215         short_preamble = false;
 216
 217         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 218         erp = 0;
 219         if (vif) {
 220                 sdata = vif_to_sdata(vif);
 221                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 222                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 223                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 224                 shift = ieee80211_vif_get_shift(vif);
 225         }
 226
 227         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 228
 229         /* Data frame duration */
 230         dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
 231                                        erp, short_preamble, shift);
 232         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 233                 /* ACK duration */
 234                 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 235                                                 erp, short_preamble, shift);
 236         }
 237
 238         return cpu_to_le16(dur);
 239 }
 240 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 241
 242 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 243 {
 244         struct ieee80211_sub_if_data *sdata;
 245         int n_acs = IEEE80211_NUM_ACS;
 246
 247         if (local->hw.queues < IEEE80211_NUM_ACS)
 248                 n_acs = 1;
 249
 250         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 251                 int ac;
 252
 253                 if (!sdata->dev)
 254                         continue;
 255
 256                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 257                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 258                         continue;
 259
 260                 for (ac = 0; ac < n_acs; ac++) {
 261                         int ac_queue = sdata->vif.hw_queue[ac];
 262
 263                         if (local->ops->wake_tx_queue &&
 264                             (atomic_read(&sdata->txqs_len[ac]) >
 265                              local->hw.txq_ac_max_pending))
 266                                 continue;
 267
 268                         if (ac_queue == queue ||
 269                             (sdata->vif.cab_queue == queue &&
 270                              local->queue_stop_reasons[ac_queue] == 0 &&
 271                              skb_queue_empty(&local->pending[ac_queue])))
 272                                 netif_wake_subqueue(sdata->dev, ac);
 273                 }
 274         }
 275 }
 276
 277 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 278                                    enum queue_stop_reason reason,
 279                                    bool refcounted)
 280 {
 281         struct ieee80211_local *local = hw_to_local(hw);
 282
 283         trace_wake_queue(local, queue, reason);
 284
 285         if (WARN_ON(queue >= hw->queues))
 286                 return;
 287
 288         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 289                 return;
 290
 291         if (!refcounted) {
 292                 local->q_stop_reasons[queue][reason] = 0;
 293         } else {
 294                 local->q_stop_reasons[queue][reason]--;
 295                 if (WARN_ON(local->q_stop_reasons[queue][reason] < 0))
 296                         local->q_stop_reasons[queue][reason] = 0;
 297         }
 298
 299         if (local->q_stop_reasons[queue][reason] == 0)
 300                 __clear_bit(reason, &local->queue_stop_reasons[queue]);
 301
 302         if (local->queue_stop_reasons[queue] != 0)
 303                 /* someone still has this queue stopped */
 304                 return;
 305
 306         if (skb_queue_empty(&local->pending[queue])) {
 307                 rcu_read_lock();
 308                 ieee80211_propagate_queue_wake(local, queue);
 309                 rcu_read_unlock();
 310         } else
 311                 tasklet_schedule(&local->tx_pending_tasklet);
 312 }
 313
 314 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 315                                     enum queue_stop_reason reason,
 316                                     bool refcounted)
 317 {
 318         struct ieee80211_local *local = hw_to_local(hw);
 319         unsigned long flags;
 320
 321         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 322         __ieee80211_wake_queue(hw, queue, reason, refcounted);
 323         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 324 }
 325
 326 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 327 {
 328         ieee80211_wake_queue_by_reason(hw, queue,
 329                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 330                                        false);
 331 }
 332 EXPORT_SYMBOL(ieee80211_wake_queue);
 333
 334 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 335                                    enum queue_stop_reason reason,
 336                                    bool refcounted)
 337 {
 338         struct ieee80211_local *local = hw_to_local(hw);
 339         struct ieee80211_sub_if_data *sdata;
 340         int n_acs = IEEE80211_NUM_ACS;
 341
 342         trace_stop_queue(local, queue, reason);
 343
 344         if (WARN_ON(queue >= hw->queues))
 345                 return;
 346
 347         if (!refcounted)
 348                 local->q_stop_reasons[queue][reason] = 1;
 349         else
 350                 local->q_stop_reasons[queue][reason]++;
 351
 352         if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
 353                 return;
 354
 355         if (local->hw.queues < IEEE80211_NUM_ACS)
 356                 n_acs = 1;
 357
 358         rcu_read_lock();
 359         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 360                 int ac;
 361
 362                 if (!sdata->dev)
 363                         continue;
 364
 365                 for (ac = 0; ac < n_acs; ac++) {
 366                         if (sdata->vif.hw_queue[ac] == queue ||
 367                             sdata->vif.cab_queue == queue)
 368                                 netif_stop_subqueue(sdata->dev, ac);
 369                 }
 370         }
 371         rcu_read_unlock();
 372 }
 373
 374 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 375                                     enum queue_stop_reason reason,
 376                                     bool refcounted)
 377 {
 378         struct ieee80211_local *local = hw_to_local(hw);
 379         unsigned long flags;
 380
 381         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 382         __ieee80211_stop_queue(hw, queue, reason, refcounted);
 383         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 384 }
 385
 386 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 387 {
 388         ieee80211_stop_queue_by_reason(hw, queue,
 389                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 390                                        false);
 391 }
 392 EXPORT_SYMBOL(ieee80211_stop_queue);
 393
 394 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 395                                struct sk_buff *skb)
 396 {
 397         struct ieee80211_hw *hw = &local->hw;
 398         unsigned long flags;
 399         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 400         int queue = info->hw_queue;
 401
 402         if (WARN_ON(!info->control.vif)) {
 403                 ieee80211_free_txskb(&local->hw, skb);
 404                 return;
 405         }
 406
 407         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 408         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 409                                false);
 410         __skb_queue_tail(&local->pending[queue], skb);
 411         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 412                                false);
 413         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 414 }
 415
 416 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 417                                 struct sk_buff_head *skbs)
 418 {
 419         struct ieee80211_hw *hw = &local->hw;
 420         struct sk_buff *skb;
 421         unsigned long flags;
 422         int queue, i;
 423
 424         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 425         while ((skb = skb_dequeue(skbs))) {
 426                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 427
 428                 if (WARN_ON(!info->control.vif)) {
 429                         ieee80211_free_txskb(&local->hw, skb);
 430                         continue;
 431                 }
 432
 433                 queue = info->hw_queue;
 434
 435                 __ieee80211_stop_queue(hw, queue,
 436                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 437                                 false);
 438
 439                 __skb_queue_tail(&local->pending[queue], skb);
 440         }
 441
 442         for (i = 0; i < hw->queues; i++)
 443                 __ieee80211_wake_queue(hw, i,
 444                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 445                         false);
 446         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 447 }
 448
 449 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 450                                      unsigned long queues,
 451                                      enum queue_stop_reason reason,
 452                                      bool refcounted)
 453 {
 454         struct ieee80211_local *local = hw_to_local(hw);
 455         unsigned long flags;
 456         int i;
 457
 458         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 459
 460         for_each_set_bit(i, &queues, hw->queues)
 461                 __ieee80211_stop_queue(hw, i, reason, refcounted);
 462
 463         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 464 }
 465
 466 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 467 {
 468         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 469                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 470                                         false);
 471 }
 472 EXPORT_SYMBOL(ieee80211_stop_queues);
 473
 474 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 475 {
 476         struct ieee80211_local *local = hw_to_local(hw);
 477         unsigned long flags;
 478         int ret;
 479
 480         if (WARN_ON(queue >= hw->queues))
 481                 return true;
 482
 483         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 484         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 485                        &local->queue_stop_reasons[queue]);
 486         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 487         return ret;
 488 }
 489 EXPORT_SYMBOL(ieee80211_queue_stopped);
 490
 491 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 492                                      unsigned long queues,
 493                                      enum queue_stop_reason reason,
 494                                      bool refcounted)
 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_each_set_bit(i, &queues, hw->queues)
 503                 __ieee80211_wake_queue(hw, i, reason, refcounted);
 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_MAX_QUEUE_MAP,
 511                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 512                                         false);
 513 }
 514 EXPORT_SYMBOL(ieee80211_wake_queues);
 515
 516 static unsigned int
 517 ieee80211_get_vif_queues(struct ieee80211_local *local,
 518                          struct ieee80211_sub_if_data *sdata)
 519 {
 520         unsigned int queues;
 521
 522         if (sdata && ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
 523                 int ac;
 524
 525                 queues = 0;
 526
 527                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 528                         queues |= BIT(sdata->vif.hw_queue[ac]);
 529                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 530                         queues |= BIT(sdata->vif.cab_queue);
 531         } else {
 532                 /* all queues */
 533                 queues = BIT(local->hw.queues) - 1;
 534         }
 535
 536         return queues;
 537 }
 538
 539 void __ieee80211_flush_queues(struct ieee80211_local *local,
 540                               struct ieee80211_sub_if_data *sdata,
 541                               unsigned int queues, bool drop)
 542 {
 543         if (!local->ops->flush)
 544                 return;
 545
 546         /*
 547          * If no queue was set, or if the HW doesn't support
 548          * IEEE80211_HW_QUEUE_CONTROL - flush all queues
 549          */
 550         if (!queues || !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 551                 queues = ieee80211_get_vif_queues(local, sdata);
 552
 553         ieee80211_stop_queues_by_reason(&local->hw, queues,
 554                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 555                                         false);
 556
 557         drv_flush(local, sdata, queues, drop);
 558
 559         ieee80211_wake_queues_by_reason(&local->hw, queues,
 560                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 561                                         false);
 562 }
 563
 564 void ieee80211_flush_queues(struct ieee80211_local *local,
 565                             struct ieee80211_sub_if_data *sdata, bool drop)
 566 {
 567         __ieee80211_flush_queues(local, sdata, 0, drop);
 568 }
 569
 570 void ieee80211_stop_vif_queues(struct ieee80211_local *local,
 571                                struct ieee80211_sub_if_data *sdata,
 572                                enum queue_stop_reason reason)
 573 {
 574         ieee80211_stop_queues_by_reason(&local->hw,
 575                                         ieee80211_get_vif_queues(local, sdata),
 576                                         reason, true);
 577 }
 578
 579 void ieee80211_wake_vif_queues(struct ieee80211_local *local,
 580                                struct ieee80211_sub_if_data *sdata,
 581                                enum queue_stop_reason reason)
 582 {
 583         ieee80211_wake_queues_by_reason(&local->hw,
 584                                         ieee80211_get_vif_queues(local, sdata),
 585                                         reason, true);
 586 }
 587
 588 static void __iterate_interfaces(struct ieee80211_local *local,
 589                                  u32 iter_flags,
 590                                  void (*iterator)(void *data, u8 *mac,
 591                                                   struct ieee80211_vif *vif),
 592                                  void *data)
 593 {
 594         struct ieee80211_sub_if_data *sdata;
 595         bool active_only = iter_flags & IEEE80211_IFACE_ITER_ACTIVE;
 596
 597         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 598                 switch (sdata->vif.type) {
 599                 case NL80211_IFTYPE_MONITOR:
 600                         if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 601                                 continue;
 602                         break;
 603                 case NL80211_IFTYPE_AP_VLAN:
 604                         continue;
 605                 default:
 606                         break;
 607                 }
 608                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 609                     active_only && !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 610                         continue;
 611                 if (ieee80211_sdata_running(sdata) || !active_only)
 612                         iterator(data, sdata->vif.addr,
 613                                  &sdata->vif);
 614         }
 615
 616         sdata = rcu_dereference_check(local->monitor_sdata,
 617                                       lockdep_is_held(&local->iflist_mtx) ||
 618                                       lockdep_rtnl_is_held());
 619         if (sdata &&
 620             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL || !active_only ||
 621              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 622                 iterator(data, sdata->vif.addr, &sdata->vif);
 623 }
 624
 625 void ieee80211_iterate_interfaces(
 626         struct ieee80211_hw *hw, u32 iter_flags,
 627         void (*iterator)(void *data, u8 *mac,
 628                          struct ieee80211_vif *vif),
 629         void *data)
 630 {
 631         struct ieee80211_local *local = hw_to_local(hw);
 632
 633         mutex_lock(&local->iflist_mtx);
 634         __iterate_interfaces(local, iter_flags, iterator, data);
 635         mutex_unlock(&local->iflist_mtx);
 636 }
 637 EXPORT_SYMBOL_GPL(ieee80211_iterate_interfaces);
 638
 639 void ieee80211_iterate_active_interfaces_atomic(
 640         struct ieee80211_hw *hw, u32 iter_flags,
 641         void (*iterator)(void *data, u8 *mac,
 642                          struct ieee80211_vif *vif),
 643         void *data)
 644 {
 645         struct ieee80211_local *local = hw_to_local(hw);
 646
 647         rcu_read_lock();
 648         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
 649                              iterator, data);
 650         rcu_read_unlock();
 651 }
 652 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 653
 654 void ieee80211_iterate_active_interfaces_rtnl(
 655         struct ieee80211_hw *hw, u32 iter_flags,
 656         void (*iterator)(void *data, u8 *mac,
 657                          struct ieee80211_vif *vif),
 658         void *data)
 659 {
 660         struct ieee80211_local *local = hw_to_local(hw);
 661
 662         ASSERT_RTNL();
 663
 664         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
 665                              iterator, data);
 666 }
 667 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
 668
 669 static void __iterate_stations(struct ieee80211_local *local,
 670                                void (*iterator)(void *data,
 671                                                 struct ieee80211_sta *sta),
 672                                void *data)
 673 {
 674         struct sta_info *sta;
 675
 676         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 677                 if (!sta->uploaded)
 678                         continue;
 679
 680                 iterator(data, &sta->sta);
 681         }
 682 }
 683
 684 void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
 685                         void (*iterator)(void *data,
 686                                          struct ieee80211_sta *sta),
 687                         void *data)
 688 {
 689         struct ieee80211_local *local = hw_to_local(hw);
 690
 691         rcu_read_lock();
 692         __iterate_stations(local, iterator, data);
 693         rcu_read_unlock();
 694 }
 695 EXPORT_SYMBOL_GPL(ieee80211_iterate_stations_atomic);
 696
 697 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
 698 {
 699         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 700
 701         if (!ieee80211_sdata_running(sdata) ||
 702             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 703                 return NULL;
 704         return &sdata->vif;
 705 }
 706 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
 707
 708 struct wireless_dev *ieee80211_vif_to_wdev(struct ieee80211_vif *vif)
 709 {
 710         struct ieee80211_sub_if_data *sdata;
 711
 712         if (!vif)
 713                 return NULL;
 714
 715         sdata = vif_to_sdata(vif);
 716
 717         if (!ieee80211_sdata_running(sdata) ||
 718             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 719                 return NULL;
 720
 721         return &sdata->wdev;
 722 }
 723 EXPORT_SYMBOL_GPL(ieee80211_vif_to_wdev);
 724
 725 /*
 726  * Nothing should have been stuffed into the workqueue during
 727  * the suspend->resume cycle. Since we can't check each caller
 728  * of this function if we are already quiescing / suspended,
 729  * check here and don't WARN since this can actually happen when
 730  * the rx path (for example) is racing against __ieee80211_suspend
 731  * and suspending / quiescing was set after the rx path checked
 732  * them.
 733  */
 734 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 735 {
 736         if (local->quiescing || (local->suspended && !local->resuming)) {
 737                 pr_warn("queueing ieee80211 work while going to suspend\n");
 738                 return false;
 739         }
 740
 741         return true;
 742 }
 743
 744 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 745 {
 746         struct ieee80211_local *local = hw_to_local(hw);
 747
 748         if (!ieee80211_can_queue_work(local))
 749                 return;
 750
 751         queue_work(local->workqueue, work);
 752 }
 753 EXPORT_SYMBOL(ieee80211_queue_work);
 754
 755 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 756                                   struct delayed_work *dwork,
 757                                   unsigned long delay)
 758 {
 759         struct ieee80211_local *local = hw_to_local(hw);
 760
 761         if (!ieee80211_can_queue_work(local))
 762                 return;
 763
 764         queue_delayed_work(local->workqueue, dwork, delay);
 765 }
 766 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 767
 768 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 769                                struct ieee802_11_elems *elems,
 770                                u64 filter, u32 crc)
 771 {
 772         size_t left = len;
 773         const u8 *pos = start;
 774         bool calc_crc = filter != 0;
 775         DECLARE_BITMAP(seen_elems, 256);
 776         const u8 *ie;
 777
 778         bitmap_zero(seen_elems, 256);
 779         memset(elems, 0, sizeof(*elems));
 780         elems->ie_start = start;
 781         elems->total_len = len;
 782
 783         while (left >= 2) {
 784                 u8 id, elen;
 785                 bool elem_parse_failed;
 786
 787                 id = *pos++;
 788                 elen = *pos++;
 789                 left -= 2;
 790
 791                 if (elen > left) {
 792                         elems->parse_error = true;
 793                         break;
 794                 }
 795
 796                 switch (id) {
 797                 case WLAN_EID_SSID:
 798                 case WLAN_EID_SUPP_RATES:
 799                 case WLAN_EID_FH_PARAMS:
 800                 case WLAN_EID_DS_PARAMS:
 801                 case WLAN_EID_CF_PARAMS:
 802                 case WLAN_EID_TIM:
 803                 case WLAN_EID_IBSS_PARAMS:
 804                 case WLAN_EID_CHALLENGE:
 805                 case WLAN_EID_RSN:
 806                 case WLAN_EID_ERP_INFO:
 807                 case WLAN_EID_EXT_SUPP_RATES:
 808                 case WLAN_EID_HT_CAPABILITY:
 809                 case WLAN_EID_HT_OPERATION:
 810                 case WLAN_EID_VHT_CAPABILITY:
 811                 case WLAN_EID_VHT_OPERATION:
 812                 case WLAN_EID_MESH_ID:
 813                 case WLAN_EID_MESH_CONFIG:
 814                 case WLAN_EID_PEER_MGMT:
 815                 case WLAN_EID_PREQ:
 816                 case WLAN_EID_PREP:
 817                 case WLAN_EID_PERR:
 818                 case WLAN_EID_RANN:
 819                 case WLAN_EID_CHANNEL_SWITCH:
 820                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 821                 case WLAN_EID_COUNTRY:
 822                 case WLAN_EID_PWR_CONSTRAINT:
 823                 case WLAN_EID_TIMEOUT_INTERVAL:
 824                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 825                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 826                 case WLAN_EID_CHAN_SWITCH_PARAM:
 827                 case WLAN_EID_EXT_CAPABILITY:
 828                 case WLAN_EID_CHAN_SWITCH_TIMING:
 829                 case WLAN_EID_LINK_ID:
 830                 /*
 831                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 832                  * that if the content gets bigger it might be needed more than once
 833                  */
 834                         if (test_bit(id, seen_elems)) {
 835                                 elems->parse_error = true;
 836                                 left -= elen;
 837                                 pos += elen;
 838                                 continue;
 839                         }
 840                         break;
 841                 }
 842
 843                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 844                         crc = crc32_be(crc, pos - 2, elen + 2);
 845
 846                 elem_parse_failed = false;
 847
 848                 switch (id) {
 849                 case WLAN_EID_LINK_ID:
 850                         if (elen + 2 != sizeof(struct ieee80211_tdls_lnkie)) {
 851                                 elem_parse_failed = true;
 852                                 break;
 853                         }
 854                         elems->lnk_id = (void *)(pos - 2);
 855                         break;
 856                 case WLAN_EID_CHAN_SWITCH_TIMING:
 857                         if (elen != sizeof(struct ieee80211_ch_switch_timing)) {
 858                                 elem_parse_failed = true;
 859                                 break;
 860                         }
 861                         elems->ch_sw_timing = (void *)pos;
 862                         break;
 863                 case WLAN_EID_EXT_CAPABILITY:
 864                         elems->ext_capab = pos;
 865                         elems->ext_capab_len = elen;
 866                         break;
 867                 case WLAN_EID_SSID:
 868                         elems->ssid = pos;
 869                         elems->ssid_len = elen;
 870                         break;
 871                 case WLAN_EID_SUPP_RATES:
 872                         elems->supp_rates = pos;
 873                         elems->supp_rates_len = elen;
 874                         break;
 875                 case WLAN_EID_DS_PARAMS:
 876                         if (elen >= 1)
 877                                 elems->ds_params = pos;
 878                         else
 879                                 elem_parse_failed = true;
 880                         break;
 881                 case WLAN_EID_TIM:
 882                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 883                                 elems->tim = (void *)pos;
 884                                 elems->tim_len = elen;
 885                         } else
 886                                 elem_parse_failed = true;
 887                         break;
 888                 case WLAN_EID_CHALLENGE:
 889                         elems->challenge = pos;
 890                         elems->challenge_len = elen;
 891                         break;
 892                 case WLAN_EID_VENDOR_SPECIFIC:
 893                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 894                             pos[2] == 0xf2) {
 895                                 /* Microsoft OUI (00:50:F2) */
 896
 897                                 if (calc_crc)
 898                                         crc = crc32_be(crc, pos - 2, elen + 2);
 899
 900                                 if (elen >= 5 && pos[3] == 2) {
 901                                         /* OUI Type 2 - WMM IE */
 902                                         if (pos[4] == 0) {
 903                                                 elems->wmm_info = pos;
 904                                                 elems->wmm_info_len = elen;
 905                                         } else if (pos[4] == 1) {
 906                                                 elems->wmm_param = pos;
 907                                                 elems->wmm_param_len = elen;
 908                                         }
 909                                 }
 910                         }
 911                         break;
 912                 case WLAN_EID_RSN:
 913                         elems->rsn = pos;
 914                         elems->rsn_len = elen;
 915                         break;
 916                 case WLAN_EID_ERP_INFO:
 917                         if (elen >= 1)
 918                                 elems->erp_info = pos;
 919                         else
 920                                 elem_parse_failed = true;
 921                         break;
 922                 case WLAN_EID_EXT_SUPP_RATES:
 923                         elems->ext_supp_rates = pos;
 924                         elems->ext_supp_rates_len = elen;
 925                         break;
 926                 case WLAN_EID_HT_CAPABILITY:
 927                         if (elen >= sizeof(struct ieee80211_ht_cap))
 928                                 elems->ht_cap_elem = (void *)pos;
 929                         else
 930                                 elem_parse_failed = true;
 931                         break;
 932                 case WLAN_EID_HT_OPERATION:
 933                         if (elen >= sizeof(struct ieee80211_ht_operation))
 934                                 elems->ht_operation = (void *)pos;
 935                         else
 936                                 elem_parse_failed = true;
 937                         break;
 938                 case WLAN_EID_VHT_CAPABILITY:
 939                         if (elen >= sizeof(struct ieee80211_vht_cap))
 940                                 elems->vht_cap_elem = (void *)pos;
 941                         else
 942                                 elem_parse_failed = true;
 943                         break;
 944                 case WLAN_EID_VHT_OPERATION:
 945                         if (elen >= sizeof(struct ieee80211_vht_operation))
 946                                 elems->vht_operation = (void *)pos;
 947                         else
 948                                 elem_parse_failed = true;
 949                         break;
 950                 case WLAN_EID_OPMODE_NOTIF:
 951                         if (elen > 0)
 952                                 elems->opmode_notif = pos;
 953                         else
 954                                 elem_parse_failed = true;
 955                         break;
 956                 case WLAN_EID_MESH_ID:
 957                         elems->mesh_id = pos;
 958                         elems->mesh_id_len = elen;
 959                         break;
 960                 case WLAN_EID_MESH_CONFIG:
 961                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 962                                 elems->mesh_config = (void *)pos;
 963                         else
 964                                 elem_parse_failed = true;
 965                         break;
 966                 case WLAN_EID_PEER_MGMT:
 967                         elems->peering = pos;
 968                         elems->peering_len = elen;
 969                         break;
 970                 case WLAN_EID_MESH_AWAKE_WINDOW:
 971                         if (elen >= 2)
 972                                 elems->awake_window = (void *)pos;
 973                         break;
 974                 case WLAN_EID_PREQ:
 975                         elems->preq = pos;
 976                         elems->preq_len = elen;
 977                         break;
 978                 case WLAN_EID_PREP:
 979                         elems->prep = pos;
 980                         elems->prep_len = elen;
 981                         break;
 982                 case WLAN_EID_PERR:
 983                         elems->perr = pos;
 984                         elems->perr_len = elen;
 985                         break;
 986                 case WLAN_EID_RANN:
 987                         if (elen >= sizeof(struct ieee80211_rann_ie))
 988                                 elems->rann = (void *)pos;
 989                         else
 990                                 elem_parse_failed = true;
 991                         break;
 992                 case WLAN_EID_CHANNEL_SWITCH:
 993                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 994                                 elem_parse_failed = true;
 995                                 break;
 996                         }
 997                         elems->ch_switch_ie = (void *)pos;
 998                         break;
 999                 case WLAN_EID_EXT_CHANSWITCH_ANN:
1000                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
1001                                 elem_parse_failed = true;
1002                                 break;
1003                         }
1004                         elems->ext_chansw_ie = (void *)pos;
1005                         break;
1006                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
1007                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
1008                                 elem_parse_failed = true;
1009                                 break;
1010                         }
1011                         elems->sec_chan_offs = (void *)pos;
1012                         break;
1013                 case WLAN_EID_CHAN_SWITCH_PARAM:
1014                         if (elen !=
1015                             sizeof(*elems->mesh_chansw_params_ie)) {
1016                                 elem_parse_failed = true;
1017                                 break;
1018                         }
1019                         elems->mesh_chansw_params_ie = (void *)pos;
1020                         break;
1021                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
1022                         if (!action ||
1023                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
1024                                 elem_parse_failed = true;
1025                                 break;
1026                         }
1027                         elems->wide_bw_chansw_ie = (void *)pos;
1028                         break;
1029                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
1030                         if (action) {
1031                                 elem_parse_failed = true;
1032                                 break;
1033                         }
1034                         /*
1035                          * This is a bit tricky, but as we only care about
1036                          * the wide bandwidth channel switch element, so
1037                          * just parse it out manually.
1038                          */
1039                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
1040                                               pos, elen);
1041                         if (ie) {
1042                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
1043                                         elems->wide_bw_chansw_ie =
1044                                                 (void *)(ie + 2);
1045                                 else
1046                                         elem_parse_failed = true;
1047                         }
1048                         break;
1049                 case WLAN_EID_COUNTRY:
1050                         elems->country_elem = pos;
1051                         elems->country_elem_len = elen;
1052                         break;
1053                 case WLAN_EID_PWR_CONSTRAINT:
1054                         if (elen != 1) {
1055                                 elem_parse_failed = true;
1056                                 break;
1057                         }
1058                         elems->pwr_constr_elem = pos;
1059                         break;
1060                 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
1061                         /* Lots of different options exist, but we only care
1062                          * about the Dynamic Transmit Power Control element.
1063                          * First check for the Cisco OUI, then for the DTPC
1064                          * tag (0x00).
1065                          */
1066                         if (elen < 4) {
1067                                 elem_parse_failed = true;
1068                                 break;
1069                         }
1070
1071                         if (pos[0] != 0x00 || pos[1] != 0x40 ||
1072                             pos[2] != 0x96 || pos[3] != 0x00)
1073                                 break;
1074
1075                         if (elen != 6) {
1076                                 elem_parse_failed = true;
1077                                 break;
1078                         }
1079
1080                         if (calc_crc)
1081                                 crc = crc32_be(crc, pos - 2, elen + 2);
1082
1083                         elems->cisco_dtpc_elem = pos;
1084                         break;
1085                 case WLAN_EID_TIMEOUT_INTERVAL:
1086                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
1087                                 elems->timeout_int = (void *)pos;
1088                         else
1089                                 elem_parse_failed = true;
1090                         break;
1091                 default:
1092                         break;
1093                 }
1094
1095                 if (elem_parse_failed)
1096                         elems->parse_error = true;
1097                 else
1098                         __set_bit(id, seen_elems);
1099
1100                 left -= elen;
1101                 pos += elen;
1102         }
1103
1104         if (left != 0)
1105                 elems->parse_error = true;
1106
1107         return crc;
1108 }
1109
1110 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
1111                                bool bss_notify, bool enable_qos)
1112 {
1113         struct ieee80211_local *local = sdata->local;
1114         struct ieee80211_tx_queue_params qparam;
1115         struct ieee80211_chanctx_conf *chanctx_conf;
1116         int ac;
1117         bool use_11b;
1118         bool is_ocb; /* Use another EDCA parameters if dot11OCBActivated=true */
1119         int aCWmin, aCWmax;
1120
1121         if (!local->ops->conf_tx)
1122                 return;
1123
1124         if (local->hw.queues < IEEE80211_NUM_ACS)
1125                 return;
1126
1127         memset(&qparam, 0, sizeof(qparam));
1128
1129         rcu_read_lock();
1130         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1131         use_11b = (chanctx_conf &&
1132                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1133                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1134         rcu_read_unlock();
1135
1136         is_ocb = (sdata->vif.type == NL80211_IFTYPE_OCB);
1137
1138         /* Set defaults according to 802.11-2007 Table 7-37 */
1139         aCWmax = 1023;
1140         if (use_11b)
1141                 aCWmin = 31;
1142         else
1143                 aCWmin = 15;
1144
1145         /* Confiure old 802.11b/g medium access rules. */
1146         qparam.cw_max = aCWmax;
1147         qparam.cw_min = aCWmin;
1148         qparam.txop = 0;
1149         qparam.aifs = 2;
1150
1151         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1152                 /* Update if QoS is enabled. */
1153                 if (enable_qos) {
1154                         switch (ac) {
1155                         case IEEE80211_AC_BK:
1156                                 qparam.cw_max = aCWmax;
1157                                 qparam.cw_min = aCWmin;
1158                                 qparam.txop = 0;
1159                                 if (is_ocb)
1160                                         qparam.aifs = 9;
1161                                 else
1162                                         qparam.aifs = 7;
1163                                 break;
1164                         /* never happens but let's not leave undefined */
1165                         default:
1166                         case IEEE80211_AC_BE:
1167                                 qparam.cw_max = aCWmax;
1168                                 qparam.cw_min = aCWmin;
1169                                 qparam.txop = 0;
1170                                 if (is_ocb)
1171                                         qparam.aifs = 6;
1172                                 else
1173                                         qparam.aifs = 3;
1174                                 break;
1175                         case IEEE80211_AC_VI:
1176                                 qparam.cw_max = aCWmin;
1177                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1178                                 if (is_ocb)
1179                                         qparam.txop = 0;
1180                                 else if (use_11b)
1181                                         qparam.txop = 6016/32;
1182                                 else
1183                                         qparam.txop = 3008/32;
1184
1185                                 if (is_ocb)
1186                                         qparam.aifs = 3;
1187                                 else
1188                                         qparam.aifs = 2;
1189                                 break;
1190                         case IEEE80211_AC_VO:
1191                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1192                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1193                                 if (is_ocb)
1194                                         qparam.txop = 0;
1195                                 else if (use_11b)
1196                                         qparam.txop = 3264/32;
1197                                 else
1198                                         qparam.txop = 1504/32;
1199                                 qparam.aifs = 2;
1200                                 break;
1201                         }
1202                 }
1203
1204                 qparam.uapsd = false;
1205
1206                 sdata->tx_conf[ac] = qparam;
1207                 drv_conf_tx(local, sdata, ac, &qparam);
1208         }
1209
1210         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1211             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1212                 sdata->vif.bss_conf.qos = enable_qos;
1213                 if (bss_notify)
1214                         ieee80211_bss_info_change_notify(sdata,
1215                                                          BSS_CHANGED_QOS);
1216         }
1217 }
1218
1219 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1220                          u16 transaction, u16 auth_alg, u16 status,
1221                          const u8 *extra, size_t extra_len, const u8 *da,
1222                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1223                          u32 tx_flags)
1224 {
1225         struct ieee80211_local *local = sdata->local;
1226         struct sk_buff *skb;
1227         struct ieee80211_mgmt *mgmt;
1228         int err;
1229
1230         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1231         skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
1232                             24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
1233         if (!skb)
1234                 return;
1235
1236         skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
1237
1238         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1239         memset(mgmt, 0, 24 + 6);
1240         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1241                                           IEEE80211_STYPE_AUTH);
1242         memcpy(mgmt->da, da, ETH_ALEN);
1243         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1244         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1245         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1246         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1247         mgmt->u.auth.status_code = cpu_to_le16(status);
1248         if (extra)
1249                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1250
1251         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1252                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1253                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1254                 WARN_ON(err);
1255         }
1256
1257         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1258                                         tx_flags;
1259         ieee80211_tx_skb(sdata, skb);
1260 }
1261
1262 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1263                                     const u8 *bssid, u16 stype, u16 reason,
1264                                     bool send_frame, u8 *frame_buf)
1265 {
1266         struct ieee80211_local *local = sdata->local;
1267         struct sk_buff *skb;
1268         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1269
1270         /* build frame */
1271         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1272         mgmt->duration = 0; /* initialize only */
1273         mgmt->seq_ctrl = 0; /* initialize only */
1274         memcpy(mgmt->da, bssid, ETH_ALEN);
1275         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1276         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1277         /* u.deauth.reason_code == u.disassoc.reason_code */
1278         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1279
1280         if (send_frame) {
1281                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1282                                     IEEE80211_DEAUTH_FRAME_LEN);
1283                 if (!skb)
1284                         return;
1285
1286                 skb_reserve(skb, local->hw.extra_tx_headroom);
1287
1288                 /* copy in frame */
1289                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1290                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1291
1292                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1293                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1294                         IEEE80211_SKB_CB(skb)->flags |=
1295                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1296
1297                 ieee80211_tx_skb(sdata, skb);
1298         }
1299 }
1300
1301 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
1302                                          u8 *buffer, size_t buffer_len,
1303                                          const u8 *ie, size_t ie_len,
1304                                          enum ieee80211_band band,
1305                                          u32 rate_mask,
1306                                          struct cfg80211_chan_def *chandef,
1307                                          size_t *offset)
1308 {
1309         struct ieee80211_supported_band *sband;
1310         u8 *pos = buffer, *end = buffer + buffer_len;
1311         size_t noffset;
1312         int supp_rates_len, i;
1313         u8 rates[32];
1314         int num_rates;
1315         int ext_rates_len;
1316         int shift;
1317         u32 rate_flags;
1318         bool have_80mhz = false;
1319
1320         *offset = 0;
1321
1322         sband = local->hw.wiphy->bands[band];
1323         if (WARN_ON_ONCE(!sband))
1324                 return 0;
1325
1326         rate_flags = ieee80211_chandef_rate_flags(chandef);
1327         shift = ieee80211_chandef_get_shift(chandef);
1328
1329         num_rates = 0;
1330         for (i = 0; i < sband->n_bitrates; i++) {
1331                 if ((BIT(i) & rate_mask) == 0)
1332                         continue; /* skip rate */
1333                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1334                         continue;
1335
1336                 rates[num_rates++] =
1337                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1338                                           (1 << shift) * 5);
1339         }
1340
1341         supp_rates_len = min_t(int, num_rates, 8);
1342
1343         if (end - pos < 2 + supp_rates_len)
1344                 goto out_err;
1345         *pos++ = WLAN_EID_SUPP_RATES;
1346         *pos++ = supp_rates_len;
1347         memcpy(pos, rates, supp_rates_len);
1348         pos += supp_rates_len;
1349
1350         /* insert "request information" if in custom IEs */
1351         if (ie && ie_len) {
1352                 static const u8 before_extrates[] = {
1353                         WLAN_EID_SSID,
1354                         WLAN_EID_SUPP_RATES,
1355                         WLAN_EID_REQUEST,
1356                 };
1357                 noffset = ieee80211_ie_split(ie, ie_len,
1358                                              before_extrates,
1359                                              ARRAY_SIZE(before_extrates),
1360                                              *offset);
1361                 if (end - pos < noffset - *offset)
1362                         goto out_err;
1363                 memcpy(pos, ie + *offset, noffset - *offset);
1364                 pos += noffset - *offset;
1365                 *offset = noffset;
1366         }
1367
1368         ext_rates_len = num_rates - supp_rates_len;
1369         if (ext_rates_len > 0) {
1370                 if (end - pos < 2 + ext_rates_len)
1371                         goto out_err;
1372                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1373                 *pos++ = ext_rates_len;
1374                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1375                 pos += ext_rates_len;
1376         }
1377
1378         if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1379                 if (end - pos < 3)
1380                         goto out_err;
1381                 *pos++ = WLAN_EID_DS_PARAMS;
1382                 *pos++ = 1;
1383                 *pos++ = ieee80211_frequency_to_channel(
1384                                 chandef->chan->center_freq);
1385         }
1386
1387         /* insert custom IEs that go before HT */
1388         if (ie && ie_len) {
1389                 static const u8 before_ht[] = {
1390                         WLAN_EID_SSID,
1391                         WLAN_EID_SUPP_RATES,
1392                         WLAN_EID_REQUEST,
1393                         WLAN_EID_EXT_SUPP_RATES,
1394                         WLAN_EID_DS_PARAMS,
1395                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1396                 };
1397                 noffset = ieee80211_ie_split(ie, ie_len,
1398                                              before_ht, ARRAY_SIZE(before_ht),
1399                                              *offset);
1400                 if (end - pos < noffset - *offset)
1401                         goto out_err;
1402                 memcpy(pos, ie + *offset, noffset - *offset);
1403                 pos += noffset - *offset;
1404                 *offset = noffset;
1405         }
1406
1407         if (sband->ht_cap.ht_supported) {
1408                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1409                         goto out_err;
1410                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1411                                                 sband->ht_cap.cap);
1412         }
1413
1414         /*
1415          * If adding more here, adjust code in main.c
1416          * that calculates local->scan_ies_len.
1417          */
1418
1419         /* insert custom IEs that go before VHT */
1420         if (ie && ie_len) {
1421                 static const u8 before_vht[] = {
1422                         WLAN_EID_SSID,
1423                         WLAN_EID_SUPP_RATES,
1424                         WLAN_EID_REQUEST,
1425                         WLAN_EID_EXT_SUPP_RATES,
1426                         WLAN_EID_DS_PARAMS,
1427                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1428                         WLAN_EID_HT_CAPABILITY,
1429                         WLAN_EID_BSS_COEX_2040,
1430                         WLAN_EID_EXT_CAPABILITY,
1431                         WLAN_EID_SSID_LIST,
1432                         WLAN_EID_CHANNEL_USAGE,
1433                         WLAN_EID_INTERWORKING,
1434                         /* mesh ID can't happen here */
1435                         /* 60 GHz can't happen here right now */
1436                 };
1437                 noffset = ieee80211_ie_split(ie, ie_len,
1438                                              before_vht, ARRAY_SIZE(before_vht),
1439                                              *offset);
1440                 if (end - pos < noffset - *offset)
1441                         goto out_err;
1442                 memcpy(pos, ie + *offset, noffset - *offset);
1443                 pos += noffset - *offset;
1444                 *offset = noffset;
1445         }
1446
1447         /* Check if any channel in this sband supports at least 80 MHz */
1448         for (i = 0; i < sband->n_channels; i++) {
1449                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
1450                                                 IEEE80211_CHAN_NO_80MHZ))
1451                         continue;
1452
1453                 have_80mhz = true;
1454                 break;
1455         }
1456
1457         if (sband->vht_cap.vht_supported && have_80mhz) {
1458                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1459                         goto out_err;
1460                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1461                                                  sband->vht_cap.cap);
1462         }
1463
1464         return pos - buffer;
1465  out_err:
1466         WARN_ONCE(1, "not enough space for preq IEs\n");
1467         return pos - buffer;
1468 }
1469
1470 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1471                              size_t buffer_len,
1472                              struct ieee80211_scan_ies *ie_desc,
1473                              const u8 *ie, size_t ie_len,
1474                              u8 bands_used, u32 *rate_masks,
1475                              struct cfg80211_chan_def *chandef)
1476 {
1477         size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
1478         int i;
1479
1480         memset(ie_desc, 0, sizeof(*ie_desc));
1481
1482         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1483                 if (bands_used & BIT(i)) {
1484                         pos += ieee80211_build_preq_ies_band(local,
1485                                                              buffer + pos,
1486                                                              buffer_len - pos,
1487                                                              ie, ie_len, i,
1488                                                              rate_masks[i],
1489                                                              chandef,
1490                                                              &custom_ie_offset);
1491                         ie_desc->ies[i] = buffer + old_pos;
1492                         ie_desc->len[i] = pos - old_pos;
1493                         old_pos = pos;
1494                 }
1495         }
1496
1497         /* add any remaining custom IEs */
1498         if (ie && ie_len) {
1499                 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
1500                               "not enough space for preq custom IEs\n"))
1501                         return pos;
1502                 memcpy(buffer + pos, ie + custom_ie_offset,
1503                        ie_len - custom_ie_offset);
1504                 ie_desc->common_ies = buffer + pos;
1505                 ie_desc->common_ie_len = ie_len - custom_ie_offset;
1506                 pos += ie_len - custom_ie_offset;
1507         }
1508
1509         return pos;
1510 };
1511
1512 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1513                                           const u8 *src, const u8 *dst,
1514                                           u32 ratemask,
1515                                           struct ieee80211_channel *chan,
1516                                           const u8 *ssid, size_t ssid_len,
1517                                           const u8 *ie, size_t ie_len,
1518                                           bool directed)
1519 {
1520         struct ieee80211_local *local = sdata->local;
1521         struct cfg80211_chan_def chandef;
1522         struct sk_buff *skb;
1523         struct ieee80211_mgmt *mgmt;
1524         int ies_len;
1525         u32 rate_masks[IEEE80211_NUM_BANDS] = {};
1526         struct ieee80211_scan_ies dummy_ie_desc;
1527
1528         /*
1529          * Do not send DS Channel parameter for directed probe requests
1530          * in order to maximize the chance that we get a response.  Some
1531          * badly-behaved APs don't respond when this parameter is included.
1532          */
1533         chandef.width = sdata->vif.bss_conf.chandef.width;
1534         if (directed)
1535                 chandef.chan = NULL;
1536         else
1537                 chandef.chan = chan;
1538
1539         skb = ieee80211_probereq_get(&local->hw, src, ssid, ssid_len,
1540                                      100 + ie_len);
1541         if (!skb)
1542                 return NULL;
1543
1544         rate_masks[chan->band] = ratemask;
1545         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1546                                            skb_tailroom(skb), &dummy_ie_desc,
1547                                            ie, ie_len, BIT(chan->band),
1548                                            rate_masks, &chandef);
1549         skb_put(skb, ies_len);
1550
1551         if (dst) {
1552                 mgmt = (struct ieee80211_mgmt *) skb->data;
1553                 memcpy(mgmt->da, dst, ETH_ALEN);
1554                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1555         }
1556
1557         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1558
1559         return skb;
1560 }
1561
1562 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata,
1563                               const u8 *src, const u8 *dst,
1564                               const u8 *ssid, size_t ssid_len,
1565                               const u8 *ie, size_t ie_len,
1566                               u32 ratemask, bool directed, u32 tx_flags,
1567                               struct ieee80211_channel *channel, bool scan)
1568 {
1569         struct sk_buff *skb;
1570
1571         skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
1572                                         ssid, ssid_len,
1573                                         ie, ie_len, directed);
1574         if (skb) {
1575                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1576                 if (scan)
1577                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1578                 else
1579                         ieee80211_tx_skb(sdata, skb);
1580         }
1581 }
1582
1583 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1584                             struct ieee802_11_elems *elems,
1585                             enum ieee80211_band band, u32 *basic_rates)
1586 {
1587         struct ieee80211_supported_band *sband;
1588         size_t num_rates;
1589         u32 supp_rates, rate_flags;
1590         int i, j, shift;
1591         sband = sdata->local->hw.wiphy->bands[band];
1592
1593         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1594         shift = ieee80211_vif_get_shift(&sdata->vif);
1595
1596         if (WARN_ON(!sband))
1597                 return 1;
1598
1599         num_rates = sband->n_bitrates;
1600         supp_rates = 0;
1601         for (i = 0; i < elems->supp_rates_len +
1602                      elems->ext_supp_rates_len; i++) {
1603                 u8 rate = 0;
1604                 int own_rate;
1605                 bool is_basic;
1606                 if (i < elems->supp_rates_len)
1607                         rate = elems->supp_rates[i];
1608                 else if (elems->ext_supp_rates)
1609                         rate = elems->ext_supp_rates
1610                                 [i - elems->supp_rates_len];
1611                 own_rate = 5 * (rate & 0x7f);
1612                 is_basic = !!(rate & 0x80);
1613
1614                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1615                         continue;
1616
1617                 for (j = 0; j < num_rates; j++) {
1618                         int brate;
1619                         if ((rate_flags & sband->bitrates[j].flags)
1620                             != rate_flags)
1621                                 continue;
1622
1623                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1624                                              1 << shift);
1625
1626                         if (brate == own_rate) {
1627                                 supp_rates |= BIT(j);
1628                                 if (basic_rates && is_basic)
1629                                         *basic_rates |= BIT(j);
1630                         }
1631                 }
1632         }
1633         return supp_rates;
1634 }
1635
1636 void ieee80211_stop_device(struct ieee80211_local *local)
1637 {
1638         ieee80211_led_radio(local, false);
1639         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1640
1641         cancel_work_sync(&local->reconfig_filter);
1642
1643         flush_workqueue(local->workqueue);
1644         drv_stop(local);
1645 }
1646
1647 static void ieee80211_flush_completed_scan(struct ieee80211_local *local,
1648                                            bool aborted)
1649 {
1650         /* It's possible that we don't handle the scan completion in
1651          * time during suspend, so if it's still marked as completed
1652          * here, queue the work and flush it to clean things up.
1653          * Instead of calling the worker function directly here, we
1654          * really queue it to avoid potential races with other flows
1655          * scheduling the same work.
1656          */
1657         if (test_bit(SCAN_COMPLETED, &local->scanning)) {
1658                 /* If coming from reconfiguration failure, abort the scan so
1659                  * we don't attempt to continue a partial HW scan - which is
1660                  * possible otherwise if (e.g.) the 2.4 GHz portion was the
1661                  * completed scan, and a 5 GHz portion is still pending.
1662                  */
1663                 if (aborted)
1664                         set_bit(SCAN_ABORTED, &local->scanning);
1665                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
1666                 flush_delayed_work(&local->scan_work);
1667         }
1668 }
1669
1670 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1671 {
1672         struct ieee80211_sub_if_data *sdata;
1673         struct ieee80211_chanctx *ctx;
1674
1675         /*
1676          * We get here if during resume the device can't be restarted properly.
1677          * We might also get here if this happens during HW reset, which is a
1678          * slightly different situation and we need to drop all connections in
1679          * the latter case.
1680          *
1681          * Ask cfg80211 to turn off all interfaces, this will result in more
1682          * warnings but at least we'll then get into a clean stopped state.
1683          */
1684
1685         local->resuming = false;
1686         local->suspended = false;
1687         local->in_reconfig = false;
1688
1689         ieee80211_flush_completed_scan(local, true);
1690
1691         /* scheduled scan clearly can't be running any more, but tell
1692          * cfg80211 and clear local state
1693          */
1694         ieee80211_sched_scan_end(local);
1695
1696         list_for_each_entry(sdata, &local->interfaces, list)
1697                 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1698
1699         /* Mark channel contexts as not being in the driver any more to avoid
1700          * removing them from the driver during the shutdown process...
1701          */
1702         mutex_lock(&local->chanctx_mtx);
1703         list_for_each_entry(ctx, &local->chanctx_list, list)
1704                 ctx->driver_present = false;
1705         mutex_unlock(&local->chanctx_mtx);
1706
1707         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1708 }
1709
1710 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1711                                      struct ieee80211_sub_if_data *sdata)
1712 {
1713         struct ieee80211_chanctx_conf *conf;
1714         struct ieee80211_chanctx *ctx;
1715
1716         if (!local->use_chanctx)
1717                 return;
1718
1719         mutex_lock(&local->chanctx_mtx);
1720         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1721                                          lockdep_is_held(&local->chanctx_mtx));
1722         if (conf) {
1723                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1724                 drv_assign_vif_chanctx(local, sdata, ctx);
1725         }
1726         mutex_unlock(&local->chanctx_mtx);
1727 }
1728
1729 static void ieee80211_reconfig_stations(struct ieee80211_sub_if_data *sdata)
1730 {
1731         struct ieee80211_local *local = sdata->local;
1732         struct sta_info *sta;
1733
1734         /* add STAs back */
1735         mutex_lock(&local->sta_mtx);
1736         list_for_each_entry(sta, &local->sta_list, list) {
1737                 enum ieee80211_sta_state state;
1738
1739                 if (!sta->uploaded || sta->sdata != sdata)
1740                         continue;
1741
1742                 for (state = IEEE80211_STA_NOTEXIST;
1743                      state < sta->sta_state; state++)
1744                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1745                                               state + 1));
1746         }
1747         mutex_unlock(&local->sta_mtx);
1748 }
1749
1750 int ieee80211_reconfig(struct ieee80211_local *local)
1751 {
1752         struct ieee80211_hw *hw = &local->hw;
1753         struct ieee80211_sub_if_data *sdata;
1754         struct ieee80211_chanctx *ctx;
1755         struct sta_info *sta;
1756         int res, i;
1757         bool reconfig_due_to_wowlan = false;
1758         struct ieee80211_sub_if_data *sched_scan_sdata;
1759         struct cfg80211_sched_scan_request *sched_scan_req;
1760         bool sched_scan_stopped = false;
1761         bool suspended = local->suspended;
1762
1763         /* nothing to do if HW shouldn't run */
1764         if (!local->open_count)
1765                 goto wake_up;
1766
1767 #ifdef CONFIG_PM
1768         if (suspended)
1769                 local->resuming = true;
1770
1771         if (local->wowlan) {
1772                 /*
1773                  * In the wowlan case, both mac80211 and the device
1774                  * are functional when the resume op is called, so
1775                  * clear local->suspended so the device could operate
1776                  * normally (e.g. pass rx frames).
1777                  */
1778                 local->suspended = false;
1779                 res = drv_resume(local);
1780                 local->wowlan = false;
1781                 if (res < 0) {
1782                         local->resuming = false;
1783                         return res;
1784                 }
1785                 if (res == 0)
1786                         goto wake_up;
1787                 WARN_ON(res > 1);
1788                 /*
1789                  * res is 1, which means the driver requested
1790                  * to go through a regular reset on wakeup.
1791                  * restore local->suspended in this case.
1792                  */
1793                 reconfig_due_to_wowlan = true;
1794                 local->suspended = true;
1795         }
1796 #endif
1797
1798         /*
1799          * In case of hw_restart during suspend (without wowlan),
1800          * cancel restart work, as we are reconfiguring the device
1801          * anyway.
1802          * Note that restart_work is scheduled on a frozen workqueue,
1803          * so we can't deadlock in this case.
1804          */
1805         if (suspended && local->in_reconfig && !reconfig_due_to_wowlan)
1806                 cancel_work_sync(&local->restart_work);
1807
1808         local->started = false;
1809
1810         /*
1811          * Upon resume hardware can sometimes be goofy due to
1812          * various platform / driver / bus issues, so restarting
1813          * the device may at times not work immediately. Propagate
1814          * the error.
1815          */
1816         res = drv_start(local);
1817         if (res) {
1818                 if (suspended)
1819                         WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1820                 else
1821                         WARN(1, "Hardware became unavailable during restart.\n");
1822                 ieee80211_handle_reconfig_failure(local);
1823                 return res;
1824         }
1825
1826         /* setup fragmentation threshold */
1827         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1828
1829         /* setup RTS threshold */
1830         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1831
1832         /* reset coverage class */
1833         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1834
1835         ieee80211_led_radio(local, true);
1836         ieee80211_mod_tpt_led_trig(local,
1837                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1838
1839         /* add interfaces */
1840         sdata = rtnl_dereference(local->monitor_sdata);
1841         if (sdata) {
1842                 /* in HW restart it exists already */
1843                 WARN_ON(local->resuming);
1844                 res = drv_add_interface(local, sdata);
1845                 if (WARN_ON(res)) {
1846                         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1847                         synchronize_net();
1848                         kfree(sdata);
1849                 }
1850         }
1851
1852         list_for_each_entry(sdata, &local->interfaces, list) {
1853                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1854                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1855                     ieee80211_sdata_running(sdata)) {
1856                         res = drv_add_interface(local, sdata);
1857                         if (WARN_ON(res))
1858                                 break;
1859                 }
1860         }
1861
1862         /* If adding any of the interfaces failed above, roll back and
1863          * report failure.
1864          */
1865         if (res) {
1866                 list_for_each_entry_continue_reverse(sdata, &local->interfaces,
1867                                                      list)
1868                         if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1869                             sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1870                             ieee80211_sdata_running(sdata))
1871                                 drv_remove_interface(local, sdata);
1872                 ieee80211_handle_reconfig_failure(local);
1873                 return res;
1874         }
1875
1876         /* add channel contexts */
1877         if (local->use_chanctx) {
1878                 mutex_lock(&local->chanctx_mtx);
1879                 list_for_each_entry(ctx, &local->chanctx_list, list)
1880                         if (ctx->replace_state !=
1881                             IEEE80211_CHANCTX_REPLACES_OTHER)
1882                                 WARN_ON(drv_add_chanctx(local, ctx));
1883                 mutex_unlock(&local->chanctx_mtx);
1884
1885                 sdata = rtnl_dereference(local->monitor_sdata);
1886                 if (sdata && ieee80211_sdata_running(sdata))
1887                         ieee80211_assign_chanctx(local, sdata);
1888         }
1889
1890         /* reconfigure hardware */
1891         ieee80211_hw_config(local, ~0);
1892
1893         ieee80211_configure_filter(local);
1894
1895         /* Finally also reconfigure all the BSS information */
1896         list_for_each_entry(sdata, &local->interfaces, list) {
1897                 u32 changed;
1898
1899                 if (!ieee80211_sdata_running(sdata))
1900                         continue;
1901
1902                 ieee80211_assign_chanctx(local, sdata);
1903
1904                 switch (sdata->vif.type) {
1905                 case NL80211_IFTYPE_AP_VLAN:
1906                 case NL80211_IFTYPE_MONITOR:
1907                         break;
1908                 default:
1909                         ieee80211_reconfig_stations(sdata);
1910                         /* fall through */
1911                 case NL80211_IFTYPE_AP: /* AP stations are handled later */
1912                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1913                                 drv_conf_tx(local, sdata, i,
1914                                             &sdata->tx_conf[i]);
1915                         break;
1916                 }
1917
1918                 /* common change flags for all interface types */
1919                 changed = BSS_CHANGED_ERP_CTS_PROT |
1920                           BSS_CHANGED_ERP_PREAMBLE |
1921                           BSS_CHANGED_ERP_SLOT |
1922                           BSS_CHANGED_HT |
1923                           BSS_CHANGED_BASIC_RATES |
1924                           BSS_CHANGED_BEACON_INT |
1925                           BSS_CHANGED_BSSID |
1926                           BSS_CHANGED_CQM |
1927                           BSS_CHANGED_QOS |
1928                           BSS_CHANGED_IDLE |
1929                           BSS_CHANGED_TXPOWER;
1930
1931                 switch (sdata->vif.type) {
1932                 case NL80211_IFTYPE_STATION:
1933                         changed |= BSS_CHANGED_ASSOC |
1934                                    BSS_CHANGED_ARP_FILTER |
1935                                    BSS_CHANGED_PS;
1936
1937                         /* Re-send beacon info report to the driver */
1938                         if (sdata->u.mgd.have_beacon)
1939                                 changed |= BSS_CHANGED_BEACON_INFO;
1940
1941                         sdata_lock(sdata);
1942                         ieee80211_bss_info_change_notify(sdata, changed);
1943                         sdata_unlock(sdata);
1944                         break;
1945                 case NL80211_IFTYPE_OCB:
1946                         changed |= BSS_CHANGED_OCB;
1947                         ieee80211_bss_info_change_notify(sdata, changed);
1948                         break;
1949                 case NL80211_IFTYPE_ADHOC:
1950                         changed |= BSS_CHANGED_IBSS;
1951                         /* fall through */
1952                 case NL80211_IFTYPE_AP:
1953                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1954
1955                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1956                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1957
1958                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1959                                         drv_start_ap(local, sdata);
1960                         }
1961
1962                         /* fall through */
1963                 case NL80211_IFTYPE_MESH_POINT:
1964                         if (sdata->vif.bss_conf.enable_beacon) {
1965                                 changed |= BSS_CHANGED_BEACON |
1966                                            BSS_CHANGED_BEACON_ENABLED;
1967                                 ieee80211_bss_info_change_notify(sdata, changed);
1968                         }
1969                         break;
1970                 case NL80211_IFTYPE_WDS:
1971                 case NL80211_IFTYPE_AP_VLAN:
1972                 case NL80211_IFTYPE_MONITOR:
1973                 case NL80211_IFTYPE_P2P_DEVICE:
1974                         /* nothing to do */
1975                         break;
1976                 case NL80211_IFTYPE_UNSPECIFIED:
1977                 case NUM_NL80211_IFTYPES:
1978                 case NL80211_IFTYPE_P2P_CLIENT:
1979                 case NL80211_IFTYPE_P2P_GO:
1980                         WARN_ON(1);
1981                         break;
1982                 }
1983         }
1984
1985         ieee80211_recalc_ps(local);
1986
1987         /*
1988          * The sta might be in psm against the ap (e.g. because
1989          * this was the state before a hw restart), so we
1990          * explicitly send a null packet in order to make sure
1991          * it'll sync against the ap (and get out of psm).
1992          */
1993         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1994                 list_for_each_entry(sdata, &local->interfaces, list) {
1995                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1996                                 continue;
1997                         if (!sdata->u.mgd.associated)
1998                                 continue;
1999
2000                         ieee80211_send_nullfunc(local, sdata, false);
2001                 }
2002         }
2003
2004         /* APs are now beaconing, add back stations */
2005         mutex_lock(&local->sta_mtx);
2006         list_for_each_entry(sta, &local->sta_list, list) {
2007                 enum ieee80211_sta_state state;
2008
2009                 if (!sta->uploaded)
2010                         continue;
2011
2012                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
2013                         continue;
2014
2015                 for (state = IEEE80211_STA_NOTEXIST;
2016                      state < sta->sta_state; state++)
2017                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
2018                                               state + 1));
2019         }
2020         mutex_unlock(&local->sta_mtx);
2021
2022         /* add back keys */
2023         list_for_each_entry(sdata, &local->interfaces, list)
2024                 ieee80211_reset_crypto_tx_tailroom(sdata);
2025
2026         list_for_each_entry(sdata, &local->interfaces, list)
2027                 if (ieee80211_sdata_running(sdata))
2028                         ieee80211_enable_keys(sdata);
2029
2030         /* Reconfigure sched scan if it was interrupted by FW restart */
2031         mutex_lock(&local->mtx);
2032         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
2033                                                 lockdep_is_held(&local->mtx));
2034         sched_scan_req = rcu_dereference_protected(local->sched_scan_req,
2035                                                 lockdep_is_held(&local->mtx));
2036         if (sched_scan_sdata && sched_scan_req)
2037                 /*
2038                  * Sched scan stopped, but we don't want to report it. Instead,
2039                  * we're trying to reschedule. However, if more than one scan
2040                  * plan was set, we cannot reschedule since we don't know which
2041                  * scan plan was currently running (and some scan plans may have
2042                  * already finished).
2043                  */
2044                 if (sched_scan_req->n_scan_plans > 1 ||
2045                     __ieee80211_request_sched_scan_start(sched_scan_sdata,
2046                                                          sched_scan_req))
2047                         sched_scan_stopped = true;
2048         mutex_unlock(&local->mtx);
2049
2050         if (sched_scan_stopped)
2051                 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
2052
2053  wake_up:
2054         local->in_reconfig = false;
2055         barrier();
2056
2057         if (local->monitors == local->open_count && local->monitors > 0)
2058                 ieee80211_add_virtual_monitor(local);
2059
2060         /*
2061          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
2062          * sessions can be established after a resume.
2063          *
2064          * Also tear down aggregation sessions since reconfiguring
2065          * them in a hardware restart scenario is not easily done
2066          * right now, and the hardware will have lost information
2067          * about the sessions, but we and the AP still think they
2068          * are active. This is really a workaround though.
2069          */
2070         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
2071                 mutex_lock(&local->sta_mtx);
2072
2073                 list_for_each_entry(sta, &local->sta_list, list) {
2074                         if (!local->resuming)
2075                                 ieee80211_sta_tear_down_BA_sessions(
2076                                                 sta, AGG_STOP_LOCAL_REQUEST);
2077                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
2078                 }
2079
2080                 mutex_unlock(&local->sta_mtx);
2081         }
2082
2083         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
2084                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
2085                                         false);
2086
2087         /*
2088          * If this is for hw restart things are still running.
2089          * We may want to change that later, however.
2090          */
2091         if (local->open_count && (!suspended || reconfig_due_to_wowlan))
2092                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_RESTART);
2093
2094         if (!suspended)
2095                 return 0;
2096
2097 #ifdef CONFIG_PM
2098         /* first set suspended false, then resuming */
2099         local->suspended = false;
2100         mb();
2101         local->resuming = false;
2102
2103         ieee80211_flush_completed_scan(local, false);
2104
2105         if (local->open_count && !reconfig_due_to_wowlan)
2106                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_SUSPEND);
2107
2108         list_for_each_entry(sdata, &local->interfaces, list) {
2109                 if (!ieee80211_sdata_running(sdata))
2110                         continue;
2111                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2112                         ieee80211_sta_restart(sdata);
2113         }
2114
2115         mod_timer(&local->sta_cleanup, jiffies + 1);
2116 #else
2117         WARN_ON(1);
2118 #endif
2119
2120         return 0;
2121 }
2122
2123 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
2124 {
2125         struct ieee80211_sub_if_data *sdata;
2126         struct ieee80211_local *local;
2127         struct ieee80211_key *key;
2128
2129         if (WARN_ON(!vif))
2130                 return;
2131
2132         sdata = vif_to_sdata(vif);
2133         local = sdata->local;
2134
2135         if (WARN_ON(!local->resuming))
2136                 return;
2137
2138         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2139                 return;
2140
2141         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
2142
2143         mutex_lock(&local->key_mtx);
2144         list_for_each_entry(key, &sdata->key_list, list)
2145                 key->flags |= KEY_FLAG_TAINTED;
2146         mutex_unlock(&local->key_mtx);
2147 }
2148 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
2149
2150 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
2151 {
2152         struct ieee80211_local *local = sdata->local;
2153         struct ieee80211_chanctx_conf *chanctx_conf;
2154         struct ieee80211_chanctx *chanctx;
2155
2156         mutex_lock(&local->chanctx_mtx);
2157
2158         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2159                                         lockdep_is_held(&local->chanctx_mtx));
2160
2161         /*
2162          * This function can be called from a work, thus it may be possible
2163          * that the chanctx_conf is removed (due to a disconnection, for
2164          * example).
2165          * So nothing should be done in such case.
2166          */
2167         if (!chanctx_conf)
2168                 goto unlock;
2169
2170         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2171         ieee80211_recalc_smps_chanctx(local, chanctx);
2172  unlock:
2173         mutex_unlock(&local->chanctx_mtx);
2174 }
2175
2176 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
2177 {
2178         struct ieee80211_local *local = sdata->local;
2179         struct ieee80211_chanctx_conf *chanctx_conf;
2180         struct ieee80211_chanctx *chanctx;
2181
2182         mutex_lock(&local->chanctx_mtx);
2183
2184         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2185                                         lockdep_is_held(&local->chanctx_mtx));
2186
2187         if (WARN_ON_ONCE(!chanctx_conf))
2188                 goto unlock;
2189
2190         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2191         ieee80211_recalc_chanctx_min_def(local, chanctx);
2192  unlock:
2193         mutex_unlock(&local->chanctx_mtx);
2194 }
2195
2196 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
2197 {
2198         size_t pos = offset;
2199
2200         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
2201                 pos += 2 + ies[pos + 1];
2202
2203         return pos;
2204 }
2205
2206 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
2207                                             int rssi_min_thold,
2208                                             int rssi_max_thold)
2209 {
2210         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
2211
2212         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2213                 return;
2214
2215         /*
2216          * Scale up threshold values before storing it, as the RSSI averaging
2217          * algorithm uses a scaled up value as well. Change this scaling
2218          * factor if the RSSI averaging algorithm changes.
2219          */
2220         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
2221         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
2222 }
2223
2224 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
2225                                     int rssi_min_thold,
2226                                     int rssi_max_thold)
2227 {
2228         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2229
2230         WARN_ON(rssi_min_thold == rssi_max_thold ||
2231                 rssi_min_thold > rssi_max_thold);
2232
2233         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2234                                        rssi_max_thold);
2235 }
2236 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2237
2238 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2239 {
2240         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2241
2242         _ieee80211_enable_rssi_reports(sdata, 0, 0);
2243 }
2244 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2245
2246 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2247                               u16 cap)
2248 {
2249         __le16 tmp;
2250
2251         *pos++ = WLAN_EID_HT_CAPABILITY;
2252         *pos++ = sizeof(struct ieee80211_ht_cap);
2253         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2254
2255         /* capability flags */
2256         tmp = cpu_to_le16(cap);
2257         memcpy(pos, &tmp, sizeof(u16));
2258         pos += sizeof(u16);
2259
2260         /* AMPDU parameters */
2261         *pos++ = ht_cap->ampdu_factor |
2262                  (ht_cap->ampdu_density <<
2263                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2264
2265         /* MCS set */
2266         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2267         pos += sizeof(ht_cap->mcs);
2268
2269         /* extended capabilities */
2270         pos += sizeof(__le16);
2271
2272         /* BF capabilities */
2273         pos += sizeof(__le32);
2274
2275         /* antenna selection */
2276         pos += sizeof(u8);
2277
2278         return pos;
2279 }
2280
2281 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2282                                u32 cap)
2283 {
2284         __le32 tmp;
2285
2286         *pos++ = WLAN_EID_VHT_CAPABILITY;
2287         *pos++ = sizeof(struct ieee80211_vht_cap);
2288         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2289
2290         /* capability flags */
2291         tmp = cpu_to_le32(cap);
2292         memcpy(pos, &tmp, sizeof(u32));
2293         pos += sizeof(u32);
2294
2295         /* VHT MCS set */
2296         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2297         pos += sizeof(vht_cap->vht_mcs);
2298
2299         return pos;
2300 }
2301
2302 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2303                                const struct cfg80211_chan_def *chandef,
2304                                u16 prot_mode, bool rifs_mode)
2305 {
2306         struct ieee80211_ht_operation *ht_oper;
2307         /* Build HT Information */
2308         *pos++ = WLAN_EID_HT_OPERATION;
2309         *pos++ = sizeof(struct ieee80211_ht_operation);
2310         ht_oper = (struct ieee80211_ht_operation *)pos;
2311         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2312                                         chandef->chan->center_freq);
2313         switch (chandef->width) {
2314         case NL80211_CHAN_WIDTH_160:
2315         case NL80211_CHAN_WIDTH_80P80:
2316         case NL80211_CHAN_WIDTH_80:
2317         case NL80211_CHAN_WIDTH_40:
2318                 if (chandef->center_freq1 > chandef->chan->center_freq)
2319                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2320                 else
2321                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2322                 break;
2323         default:
2324                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2325                 break;
2326         }
2327         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2328             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2329             chandef->width != NL80211_CHAN_WIDTH_20)
2330                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2331
2332         if (rifs_mode)
2333                 ht_oper->ht_param |= IEEE80211_HT_PARAM_RIFS_MODE;
2334
2335         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2336         ht_oper->stbc_param = 0x0000;
2337
2338         /* It seems that Basic MCS set and Supported MCS set
2339            are identical for the first 10 bytes */
2340         memset(&ht_oper->basic_set, 0, 16);
2341         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2342
2343         return pos + sizeof(struct ieee80211_ht_operation);
2344 }
2345
2346 u8 *ieee80211_ie_build_vht_oper(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2347                                 const struct cfg80211_chan_def *chandef)
2348 {
2349         struct ieee80211_vht_operation *vht_oper;
2350
2351         *pos++ = WLAN_EID_VHT_OPERATION;
2352         *pos++ = sizeof(struct ieee80211_vht_operation);
2353         vht_oper = (struct ieee80211_vht_operation *)pos;
2354         vht_oper->center_freq_seg1_idx = ieee80211_frequency_to_channel(
2355                                                         chandef->center_freq1);
2356         if (chandef->center_freq2)
2357                 vht_oper->center_freq_seg2_idx =
2358                         ieee80211_frequency_to_channel(chandef->center_freq2);
2359         else
2360                 vht_oper->center_freq_seg2_idx = 0x00;
2361
2362         switch (chandef->width) {
2363         case NL80211_CHAN_WIDTH_160:
2364                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_160MHZ;
2365                 break;
2366         case NL80211_CHAN_WIDTH_80P80:
2367                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80P80MHZ;
2368                 break;
2369         case NL80211_CHAN_WIDTH_80:
2370                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2371                 break;
2372         default:
2373                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
2374                 break;
2375         }
2376
2377         /* don't require special VHT peer rates */
2378         vht_oper->basic_mcs_set = cpu_to_le16(0xffff);
2379
2380         return pos + sizeof(struct ieee80211_vht_operation);
2381 }
2382
2383 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2384                                   const struct ieee80211_ht_operation *ht_oper,
2385                                   struct cfg80211_chan_def *chandef)
2386 {
2387         enum nl80211_channel_type channel_type;
2388
2389         if (!ht_oper) {
2390                 cfg80211_chandef_create(chandef, control_chan,
2391                                         NL80211_CHAN_NO_HT);
2392                 return;
2393         }
2394
2395         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2396         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2397                 channel_type = NL80211_CHAN_HT20;
2398                 break;
2399         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2400                 channel_type = NL80211_CHAN_HT40PLUS;
2401                 break;
2402         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2403                 channel_type = NL80211_CHAN_HT40MINUS;
2404                 break;
2405         default:
2406                 channel_type = NL80211_CHAN_NO_HT;
2407         }
2408
2409         cfg80211_chandef_create(chandef, control_chan, channel_type);
2410 }
2411
2412 void ieee80211_vht_oper_to_chandef(struct ieee80211_channel *control_chan,
2413                                    const struct ieee80211_vht_operation *oper,
2414                                    struct cfg80211_chan_def *chandef)
2415 {
2416         if (!oper)
2417                 return;
2418
2419         chandef->chan = control_chan;
2420
2421         switch (oper->chan_width) {
2422         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2423                 break;
2424         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2425                 chandef->width = NL80211_CHAN_WIDTH_80;
2426                 break;
2427         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2428                 chandef->width = NL80211_CHAN_WIDTH_160;
2429                 break;
2430         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2431                 chandef->width = NL80211_CHAN_WIDTH_80P80;
2432                 break;
2433         default:
2434                 break;
2435         }
2436
2437         chandef->center_freq1 =
2438                 ieee80211_channel_to_frequency(oper->center_freq_seg1_idx,
2439                                                control_chan->band);
2440         chandef->center_freq2 =
2441                 ieee80211_channel_to_frequency(oper->center_freq_seg2_idx,
2442                                                control_chan->band);
2443 }
2444
2445 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2446                              const struct ieee80211_supported_band *sband,
2447                              const u8 *srates, int srates_len, u32 *rates)
2448 {
2449         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2450         int shift = ieee80211_chandef_get_shift(chandef);
2451         struct ieee80211_rate *br;
2452         int brate, rate, i, j, count = 0;
2453
2454         *rates = 0;
2455
2456         for (i = 0; i < srates_len; i++) {
2457                 rate = srates[i] & 0x7f;
2458
2459                 for (j = 0; j < sband->n_bitrates; j++) {
2460                         br = &sband->bitrates[j];
2461                         if ((rate_flags & br->flags) != rate_flags)
2462                                 continue;
2463
2464                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2465                         if (brate == rate) {
2466                                 *rates |= BIT(j);
2467                                 count++;
2468                                 break;
2469                         }
2470                 }
2471         }
2472         return count;
2473 }
2474
2475 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2476                             struct sk_buff *skb, bool need_basic,
2477                             enum ieee80211_band band)
2478 {
2479         struct ieee80211_local *local = sdata->local;
2480         struct ieee80211_supported_band *sband;
2481         int rate, shift;
2482         u8 i, rates, *pos;
2483         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2484         u32 rate_flags;
2485
2486         shift = ieee80211_vif_get_shift(&sdata->vif);
2487         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2488         sband = local->hw.wiphy->bands[band];
2489         rates = 0;
2490         for (i = 0; i < sband->n_bitrates; i++) {
2491                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2492                         continue;
2493                 rates++;
2494         }
2495         if (rates > 8)
2496                 rates = 8;
2497
2498         if (skb_tailroom(skb) < rates + 2)
2499                 return -ENOMEM;
2500
2501         pos = skb_put(skb, rates + 2);
2502         *pos++ = WLAN_EID_SUPP_RATES;
2503         *pos++ = rates;
2504         for (i = 0; i < rates; i++) {
2505                 u8 basic = 0;
2506                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2507                         continue;
2508
2509                 if (need_basic && basic_rates & BIT(i))
2510                         basic = 0x80;
2511                 rate = sband->bitrates[i].bitrate;
2512                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2513                                     5 * (1 << shift));
2514                 *pos++ = basic | (u8) rate;
2515         }
2516
2517         return 0;
2518 }
2519
2520 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2521                                 struct sk_buff *skb, bool need_basic,
2522                                 enum ieee80211_band band)
2523 {
2524         struct ieee80211_local *local = sdata->local;
2525         struct ieee80211_supported_band *sband;
2526         int rate, shift;
2527         u8 i, exrates, *pos;
2528         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2529         u32 rate_flags;
2530
2531         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2532         shift = ieee80211_vif_get_shift(&sdata->vif);
2533
2534         sband = local->hw.wiphy->bands[band];
2535         exrates = 0;
2536         for (i = 0; i < sband->n_bitrates; i++) {
2537                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2538                         continue;
2539                 exrates++;
2540         }
2541
2542         if (exrates > 8)
2543                 exrates -= 8;
2544         else
2545                 exrates = 0;
2546
2547         if (skb_tailroom(skb) < exrates + 2)
2548                 return -ENOMEM;
2549
2550         if (exrates) {
2551                 pos = skb_put(skb, exrates + 2);
2552                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2553                 *pos++ = exrates;
2554                 for (i = 8; i < sband->n_bitrates; i++) {
2555                         u8 basic = 0;
2556                         if ((rate_flags & sband->bitrates[i].flags)
2557                             != rate_flags)
2558                                 continue;
2559                         if (need_basic && basic_rates & BIT(i))
2560                                 basic = 0x80;
2561                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2562                                             5 * (1 << shift));
2563                         *pos++ = basic | (u8) rate;
2564                 }
2565         }
2566         return 0;
2567 }
2568
2569 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2570 {
2571         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2572         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2573
2574         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2575                 /* non-managed type inferfaces */
2576                 return 0;
2577         }
2578         return -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
2579 }
2580 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2581
2582 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2583 {
2584         if (!mcs)
2585                 return 1;
2586
2587         /* TODO: consider rx_highest */
2588
2589         if (mcs->rx_mask[3])
2590                 return 4;
2591         if (mcs->rx_mask[2])
2592                 return 3;
2593         if (mcs->rx_mask[1])
2594                 return 2;
2595         return 1;
2596 }
2597
2598 /**
2599  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2600  * @local: mac80211 hw info struct
2601  * @status: RX status
2602  * @mpdu_len: total MPDU length (including FCS)
2603  * @mpdu_offset: offset into MPDU to calculate timestamp at
2604  *
2605  * This function calculates the RX timestamp at the given MPDU offset, taking
2606  * into account what the RX timestamp was. An offset of 0 will just normalize
2607  * the timestamp to TSF at beginning of MPDU reception.
2608  */
2609 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2610                                      struct ieee80211_rx_status *status,
2611                                      unsigned int mpdu_len,
2612                                      unsigned int mpdu_offset)
2613 {
2614         u64 ts = status->mactime;
2615         struct rate_info ri;
2616         u16 rate;
2617
2618         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2619                 return 0;
2620
2621         memset(&ri, 0, sizeof(ri));
2622
2623         /* Fill cfg80211 rate info */
2624         if (status->flag & RX_FLAG_HT) {
2625                 ri.mcs = status->rate_idx;
2626                 ri.flags |= RATE_INFO_FLAGS_MCS;
2627                 if (status->flag & RX_FLAG_40MHZ)
2628                         ri.bw = RATE_INFO_BW_40;
2629                 else
2630                         ri.bw = RATE_INFO_BW_20;
2631                 if (status->flag & RX_FLAG_SHORT_GI)
2632                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2633         } else if (status->flag & RX_FLAG_VHT) {
2634                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2635                 ri.mcs = status->rate_idx;
2636                 ri.nss = status->vht_nss;
2637                 if (status->flag & RX_FLAG_40MHZ)
2638                         ri.bw = RATE_INFO_BW_40;
2639                 else if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2640                         ri.bw = RATE_INFO_BW_80;
2641                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2642                         ri.bw = RATE_INFO_BW_160;
2643                 else
2644                         ri.bw = RATE_INFO_BW_20;
2645                 if (status->flag & RX_FLAG_SHORT_GI)
2646                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2647         } else {
2648                 struct ieee80211_supported_band *sband;
2649                 int shift = 0;
2650                 int bitrate;
2651
2652                 if (status->flag & RX_FLAG_10MHZ) {
2653                         shift = 1;
2654                         ri.bw = RATE_INFO_BW_10;
2655                 } else if (status->flag & RX_FLAG_5MHZ) {
2656                         shift = 2;
2657                         ri.bw = RATE_INFO_BW_5;
2658                 } else {
2659                         ri.bw = RATE_INFO_BW_20;
2660                 }
2661
2662                 sband = local->hw.wiphy->bands[status->band];
2663                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2664                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2665         }
2666
2667         rate = cfg80211_calculate_bitrate(&ri);
2668         if (WARN_ONCE(!rate,
2669                       "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2670                       status->flag, status->rate_idx, status->vht_nss))
2671                 return 0;
2672
2673         /* rewind from end of MPDU */
2674         if (status->flag & RX_FLAG_MACTIME_END)
2675                 ts -= mpdu_len * 8 * 10 / rate;
2676
2677         ts += mpdu_offset * 8 * 10 / rate;
2678
2679         return ts;
2680 }
2681
2682 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2683 {
2684         struct ieee80211_sub_if_data *sdata;
2685         struct cfg80211_chan_def chandef;
2686
2687         mutex_lock(&local->mtx);
2688         mutex_lock(&local->iflist_mtx);
2689         list_for_each_entry(sdata, &local->interfaces, list) {
2690                 /* it might be waiting for the local->mtx, but then
2691                  * by the time it gets it, sdata->wdev.cac_started
2692                  * will no longer be true
2693                  */
2694                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2695
2696                 if (sdata->wdev.cac_started) {
2697                         chandef = sdata->vif.bss_conf.chandef;
2698                         ieee80211_vif_release_channel(sdata);
2699                         cfg80211_cac_event(sdata->dev,
2700                                            &chandef,
2701                                            NL80211_RADAR_CAC_ABORTED,
2702                                            GFP_KERNEL);
2703                 }
2704         }
2705         mutex_unlock(&local->iflist_mtx);
2706         mutex_unlock(&local->mtx);
2707 }
2708
2709 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2710 {
2711         struct ieee80211_local *local =
2712                 container_of(work, struct ieee80211_local, radar_detected_work);
2713         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2714         struct ieee80211_chanctx *ctx;
2715         int num_chanctx = 0;
2716
2717         mutex_lock(&local->chanctx_mtx);
2718         list_for_each_entry(ctx, &local->chanctx_list, list) {
2719                 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
2720                         continue;
2721
2722                 num_chanctx++;
2723                 chandef = ctx->conf.def;
2724         }
2725         mutex_unlock(&local->chanctx_mtx);
2726
2727         ieee80211_dfs_cac_cancel(local);
2728
2729         if (num_chanctx > 1)
2730                 /* XXX: multi-channel is not supported yet */
2731                 WARN_ON(1);
2732         else
2733                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2734 }
2735
2736 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2737 {
2738         struct ieee80211_local *local = hw_to_local(hw);
2739
2740         trace_api_radar_detected(local);
2741
2742         ieee80211_queue_work(hw, &local->radar_detected_work);
2743 }
2744 EXPORT_SYMBOL(ieee80211_radar_detected);
2745
2746 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2747 {
2748         u32 ret;
2749         int tmp;
2750
2751         switch (c->width) {
2752         case NL80211_CHAN_WIDTH_20:
2753                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2754                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2755                 break;
2756         case NL80211_CHAN_WIDTH_40:
2757                 c->width = NL80211_CHAN_WIDTH_20;
2758                 c->center_freq1 = c->chan->center_freq;
2759                 ret = IEEE80211_STA_DISABLE_40MHZ |
2760                       IEEE80211_STA_DISABLE_VHT;
2761                 break;
2762         case NL80211_CHAN_WIDTH_80:
2763                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2764                 /* n_P40 */
2765                 tmp /= 2;
2766                 /* freq_P40 */
2767                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2768                 c->width = NL80211_CHAN_WIDTH_40;
2769                 ret = IEEE80211_STA_DISABLE_VHT;
2770                 break;
2771         case NL80211_CHAN_WIDTH_80P80:
2772                 c->center_freq2 = 0;
2773                 c->width = NL80211_CHAN_WIDTH_80;
2774                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2775                       IEEE80211_STA_DISABLE_160MHZ;
2776                 break;
2777         case NL80211_CHAN_WIDTH_160:
2778                 /* n_P20 */
2779                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2780                 /* n_P80 */
2781                 tmp /= 4;
2782                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2783                 c->width = NL80211_CHAN_WIDTH_80;
2784                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2785                       IEEE80211_STA_DISABLE_160MHZ;
2786                 break;
2787         default:
2788         case NL80211_CHAN_WIDTH_20_NOHT:
2789                 WARN_ON_ONCE(1);
2790                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2791                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2792                 break;
2793         case NL80211_CHAN_WIDTH_5:
2794         case NL80211_CHAN_WIDTH_10:
2795                 WARN_ON_ONCE(1);
2796                 /* keep c->width */
2797                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2798                 break;
2799         }
2800
2801         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2802
2803         return ret;
2804 }
2805
2806 /*
2807  * Returns true if smps_mode_new is strictly more restrictive than
2808  * smps_mode_old.
2809  */
2810 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2811                                    enum ieee80211_smps_mode smps_mode_new)
2812 {
2813         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2814                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2815                 return false;
2816
2817         switch (smps_mode_old) {
2818         case IEEE80211_SMPS_STATIC:
2819                 return false;
2820         case IEEE80211_SMPS_DYNAMIC:
2821                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2822         case IEEE80211_SMPS_OFF:
2823                 return smps_mode_new != IEEE80211_SMPS_OFF;
2824         default:
2825                 WARN_ON(1);
2826         }
2827
2828         return false;
2829 }
2830
2831 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2832                               struct cfg80211_csa_settings *csa_settings)
2833 {
2834         struct sk_buff *skb;
2835         struct ieee80211_mgmt *mgmt;
2836         struct ieee80211_local *local = sdata->local;
2837         int freq;
2838         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2839                                sizeof(mgmt->u.action.u.chan_switch);
2840         u8 *pos;
2841
2842         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2843             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2844                 return -EOPNOTSUPP;
2845
2846         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2847                             5 + /* channel switch announcement element */
2848                             3 + /* secondary channel offset element */
2849                             8); /* mesh channel switch parameters element */
2850         if (!skb)
2851                 return -ENOMEM;
2852
2853         skb_reserve(skb, local->tx_headroom);
2854         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2855         memset(mgmt, 0, hdr_len);
2856         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2857                                           IEEE80211_STYPE_ACTION);
2858
2859         eth_broadcast_addr(mgmt->da);
2860         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2861         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2862                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2863         } else {
2864                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2865                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2866         }
2867         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2868         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2869         pos = skb_put(skb, 5);
2870         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
2871         *pos++ = 3;                                             /* IE length */
2872         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
2873         freq = csa_settings->chandef.chan->center_freq;
2874         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
2875         *pos++ = csa_settings->count;                           /* count */
2876
2877         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2878                 enum nl80211_channel_type ch_type;
2879
2880                 skb_put(skb, 3);
2881                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
2882                 *pos++ = 1;                                     /* IE length */
2883                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2884                 if (ch_type == NL80211_CHAN_HT40PLUS)
2885                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2886                 else
2887                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2888         }
2889
2890         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2891                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2892
2893                 skb_put(skb, 8);
2894                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
2895                 *pos++ = 6;                                     /* IE length */
2896                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
2897                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
2898                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2899                 *pos++ |= csa_settings->block_tx ?
2900                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2901                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2902                 pos += 2;
2903                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2904                 pos += 2;
2905         }
2906
2907         ieee80211_tx_skb(sdata, skb);
2908         return 0;
2909 }
2910
2911 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2912 {
2913         return !(cs == NULL || cs->cipher == 0 ||
2914                  cs->hdr_len < cs->pn_len + cs->pn_off ||
2915                  cs->hdr_len <= cs->key_idx_off ||
2916                  cs->key_idx_shift > 7 ||
2917                  cs->key_idx_mask == 0);
2918 }
2919
2920 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2921 {
2922         int i;
2923
2924         /* Ensure we have enough iftype bitmap space for all iftype values */
2925         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2926
2927         for (i = 0; i < n; i++)
2928                 if (!ieee80211_cs_valid(&cs[i]))
2929                         return false;
2930
2931         return true;
2932 }
2933
2934 const struct ieee80211_cipher_scheme *
2935 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2936                  enum nl80211_iftype iftype)
2937 {
2938         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2939         int n = local->hw.n_cipher_schemes;
2940         int i;
2941         const struct ieee80211_cipher_scheme *cs = NULL;
2942
2943         for (i = 0; i < n; i++) {
2944                 if (l[i].cipher == cipher) {
2945                         cs = &l[i];
2946                         break;
2947                 }
2948         }
2949
2950         if (!cs || !(cs->iftype & BIT(iftype)))
2951                 return NULL;
2952
2953         return cs;
2954 }
2955
2956 int ieee80211_cs_headroom(struct ieee80211_local *local,
2957                           struct cfg80211_crypto_settings *crypto,
2958                           enum nl80211_iftype iftype)
2959 {
2960         const struct ieee80211_cipher_scheme *cs;
2961         int headroom = IEEE80211_ENCRYPT_HEADROOM;
2962         int i;
2963
2964         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
2965                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
2966                                       iftype);
2967
2968                 if (cs && headroom < cs->hdr_len)
2969                         headroom = cs->hdr_len;
2970         }
2971
2972         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
2973         if (cs && headroom < cs->hdr_len)
2974                 headroom = cs->hdr_len;
2975
2976         return headroom;
2977 }
2978
2979 static bool
2980 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
2981 {
2982         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
2983         int skip;
2984
2985         if (end > 0)
2986                 return false;
2987
2988         /* One shot NOA  */
2989         if (data->count[i] == 1)
2990                 return false;
2991
2992         if (data->desc[i].interval == 0)
2993                 return false;
2994
2995         /* End time is in the past, check for repetitions */
2996         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
2997         if (data->count[i] < 255) {
2998                 if (data->count[i] <= skip) {
2999                         data->count[i] = 0;
3000                         return false;
3001                 }
3002
3003                 data->count[i] -= skip;
3004         }
3005
3006         data->desc[i].start += skip * data->desc[i].interval;
3007
3008         return true;
3009 }
3010
3011 static bool
3012 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
3013                              s32 *offset)
3014 {
3015         bool ret = false;
3016         int i;
3017
3018         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3019                 s32 cur;
3020
3021                 if (!data->count[i])
3022                         continue;
3023
3024                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
3025                         ret = true;
3026
3027                 cur = data->desc[i].start - tsf;
3028                 if (cur > *offset)
3029                         continue;
3030
3031                 cur = data->desc[i].start + data->desc[i].duration - tsf;
3032                 if (cur > *offset)
3033                         *offset = cur;
3034         }
3035
3036         return ret;
3037 }
3038
3039 static u32
3040 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
3041 {
3042         s32 offset = 0;
3043         int tries = 0;
3044         /*
3045          * arbitrary limit, used to avoid infinite loops when combined NoA
3046          * descriptors cover the full time period.
3047          */
3048         int max_tries = 5;
3049
3050         ieee80211_extend_absent_time(data, tsf, &offset);
3051         do {
3052                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
3053                         break;
3054
3055                 tries++;
3056         } while (tries < max_tries);
3057
3058         return offset;
3059 }
3060
3061 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
3062 {
3063         u32 next_offset = BIT(31) - 1;
3064         int i;
3065
3066         data->absent = 0;
3067         data->has_next_tsf = false;
3068         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3069                 s32 start;
3070
3071                 if (!data->count[i])
3072                         continue;
3073
3074                 ieee80211_extend_noa_desc(data, tsf, i);
3075                 start = data->desc[i].start - tsf;
3076                 if (start <= 0)
3077                         data->absent |= BIT(i);
3078
3079                 if (next_offset > start)
3080                         next_offset = start;
3081
3082                 data->has_next_tsf = true;
3083         }
3084
3085         if (data->absent)
3086                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
3087
3088         data->next_tsf = tsf + next_offset;
3089 }
3090 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
3091
3092 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
3093                             struct ieee80211_noa_data *data, u32 tsf)
3094 {
3095         int ret = 0;
3096         int i;
3097
3098         memset(data, 0, sizeof(*data));
3099
3100         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3101                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
3102
3103                 if (!desc->count || !desc->duration)
3104                         continue;
3105
3106                 data->count[i] = desc->count;
3107                 data->desc[i].start = le32_to_cpu(desc->start_time);
3108                 data->desc[i].duration = le32_to_cpu(desc->duration);
3109                 data->desc[i].interval = le32_to_cpu(desc->interval);
3110
3111                 if (data->count[i] > 1 &&
3112                     data->desc[i].interval < data->desc[i].duration)
3113                         continue;
3114
3115                 ieee80211_extend_noa_desc(data, tsf, i);
3116                 ret++;
3117         }
3118
3119         if (ret)
3120                 ieee80211_update_p2p_noa(data, tsf);
3121
3122         return ret;
3123 }
3124 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
3125
3126 void ieee80211_recalc_dtim(struct ieee80211_local *local,
3127                            struct ieee80211_sub_if_data *sdata)
3128 {
3129         u64 tsf = drv_get_tsf(local, sdata);
3130         u64 dtim_count = 0;
3131         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
3132         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
3133         struct ps_data *ps;
3134         u8 bcns_from_dtim;
3135
3136         if (tsf == -1ULL || !beacon_int || !dtim_period)
3137                 return;
3138
3139         if (sdata->vif.type == NL80211_IFTYPE_AP ||
3140             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
3141                 if (!sdata->bss)
3142                         return;
3143
3144                 ps = &sdata->bss->ps;
3145         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3146                 ps = &sdata->u.mesh.ps;
3147         } else {
3148                 return;
3149         }
3150
3151         /*
3152          * actually finds last dtim_count, mac80211 will update in
3153          * __beacon_add_tim().
3154          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
3155          */
3156         do_div(tsf, beacon_int);
3157         bcns_from_dtim = do_div(tsf, dtim_period);
3158         /* just had a DTIM */
3159         if (!bcns_from_dtim)
3160                 dtim_count = 0;
3161         else
3162                 dtim_count = dtim_period - bcns_from_dtim;
3163
3164         ps->dtim_count = dtim_count;
3165 }
3166
3167 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
3168                                          struct ieee80211_chanctx *ctx)
3169 {
3170         struct ieee80211_sub_if_data *sdata;
3171         u8 radar_detect = 0;
3172
3173         lockdep_assert_held(&local->chanctx_mtx);
3174
3175         if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
3176                 return 0;
3177
3178         list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
3179                 if (sdata->reserved_radar_required)
3180                         radar_detect |= BIT(sdata->reserved_chandef.width);
3181
3182         /*
3183          * An in-place reservation context should not have any assigned vifs
3184          * until it replaces the other context.
3185          */
3186         WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
3187                 !list_empty(&ctx->assigned_vifs));
3188
3189         list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
3190                 if (sdata->radar_required)
3191                         radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
3192
3193         return radar_detect;
3194 }
3195
3196 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
3197                                  const struct cfg80211_chan_def *chandef,
3198                                  enum ieee80211_chanctx_mode chanmode,
3199                                  u8 radar_detect)
3200 {
3201         struct ieee80211_local *local = sdata->local;
3202         struct ieee80211_sub_if_data *sdata_iter;
3203         enum nl80211_iftype iftype = sdata->wdev.iftype;
3204         int num[NUM_NL80211_IFTYPES];
3205         struct ieee80211_chanctx *ctx;
3206         int num_different_channels = 0;
3207         int total = 1;
3208
3209         lockdep_assert_held(&local->chanctx_mtx);
3210
3211         if (WARN_ON(hweight32(radar_detect) > 1))
3212                 return -EINVAL;
3213
3214         if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3215                     !chandef->chan))
3216                 return -EINVAL;
3217
3218         if (chandef)
3219                 num_different_channels = 1;
3220
3221         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
3222                 return -EINVAL;
3223
3224         /* Always allow software iftypes */
3225         if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
3226                 if (radar_detect)
3227                         return -EINVAL;
3228                 return 0;
3229         }
3230
3231         memset(num, 0, sizeof(num));
3232
3233         if (iftype != NL80211_IFTYPE_UNSPECIFIED)
3234                 num[iftype] = 1;
3235
3236         list_for_each_entry(ctx, &local->chanctx_list, list) {
3237                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3238                         continue;
3239                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3240                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
3241                         num_different_channels++;
3242                         continue;
3243                 }
3244                 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3245                     cfg80211_chandef_compatible(chandef,
3246                                                 &ctx->conf.def))
3247                         continue;
3248                 num_different_channels++;
3249         }
3250
3251         list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
3252                 struct wireless_dev *wdev_iter;
3253
3254                 wdev_iter = &sdata_iter->wdev;
3255
3256                 if (sdata_iter == sdata ||
3257                     !ieee80211_sdata_running(sdata_iter) ||
3258                     local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
3259                         continue;
3260
3261                 num[wdev_iter->iftype]++;
3262                 total++;
3263         }
3264
3265         if (total == 1 && !radar_detect)
3266                 return 0;
3267
3268         return cfg80211_check_combinations(local->hw.wiphy,
3269                                            num_different_channels,
3270                                            radar_detect, num);
3271 }
3272
3273 static void
3274 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
3275                          void *data)
3276 {
3277         u32 *max_num_different_channels = data;
3278
3279         *max_num_different_channels = max(*max_num_different_channels,
3280                                           c->num_different_channels);
3281 }
3282
3283 int ieee80211_max_num_channels(struct ieee80211_local *local)
3284 {
3285         struct ieee80211_sub_if_data *sdata;
3286         int num[NUM_NL80211_IFTYPES] = {};
3287         struct ieee80211_chanctx *ctx;
3288         int num_different_channels = 0;
3289         u8 radar_detect = 0;
3290         u32 max_num_different_channels = 1;
3291         int err;
3292
3293         lockdep_assert_held(&local->chanctx_mtx);
3294
3295         list_for_each_entry(ctx, &local->chanctx_list, list) {
3296                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3297                         continue;
3298
3299                 num_different_channels++;
3300
3301                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3302         }
3303
3304         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3305                 num[sdata->wdev.iftype]++;
3306
3307         err = cfg80211_iter_combinations(local->hw.wiphy,
3308                                          num_different_channels, radar_detect,
3309                                          num, ieee80211_iter_max_chans,
3310                                          &max_num_different_channels);
3311         if (err < 0)
3312                 return err;
3313
3314         return max_num_different_channels;
3315 }
3316
3317 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
3318 {
3319         *buf++ = WLAN_EID_VENDOR_SPECIFIC;
3320         *buf++ = 7; /* len */
3321         *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
3322         *buf++ = 0x50;
3323         *buf++ = 0xf2;
3324         *buf++ = 2; /* WME */
3325         *buf++ = 0; /* WME info */
3326         *buf++ = 1; /* WME ver */
3327         *buf++ = qosinfo; /* U-APSD no in use */
3328
3329         return buf;
3330 }
3331
3332 void ieee80211_init_tx_queue(struct ieee80211_sub_if_data *sdata,
3333                              struct sta_info *sta,
3334                              struct txq_info *txqi, int tid)
3335 {
3336         skb_queue_head_init(&txqi->queue);
3337         txqi->txq.vif = &sdata->vif;
3338
3339         if (sta) {
3340                 txqi->txq.sta = &sta->sta;
3341                 sta->sta.txq[tid] = &txqi->txq;
3342                 txqi->txq.tid = tid;
3343                 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
3344         } else {
3345                 sdata->vif.txq = &txqi->txq;
3346                 txqi->txq.tid = 0;
3347                 txqi->txq.ac = IEEE80211_AC_BE;
3348         }
3349 }