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
 296         if (local->q_stop_reasons[queue][reason] == 0)
 297                 __clear_bit(reason, &local->queue_stop_reasons[queue]);
 298
 299         if (local->queue_stop_reasons[queue] != 0)
 300                 /* someone still has this queue stopped */
 301                 return;
 302
 303         if (skb_queue_empty(&local->pending[queue])) {
 304                 rcu_read_lock();
 305                 ieee80211_propagate_queue_wake(local, queue);
 306                 rcu_read_unlock();
 307         } else
 308                 tasklet_schedule(&local->tx_pending_tasklet);
 309 }
 310
 311 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 312                                     enum queue_stop_reason reason,
 313                                     bool refcounted)
 314 {
 315         struct ieee80211_local *local = hw_to_local(hw);
 316         unsigned long flags;
 317
 318         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 319         __ieee80211_wake_queue(hw, queue, reason, refcounted);
 320         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 321 }
 322
 323 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 324 {
 325         ieee80211_wake_queue_by_reason(hw, queue,
 326                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 327                                        false);
 328 }
 329 EXPORT_SYMBOL(ieee80211_wake_queue);
 330
 331 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 332                                    enum queue_stop_reason reason,
 333                                    bool refcounted)
 334 {
 335         struct ieee80211_local *local = hw_to_local(hw);
 336         struct ieee80211_sub_if_data *sdata;
 337         int n_acs = IEEE80211_NUM_ACS;
 338
 339         trace_stop_queue(local, queue, reason);
 340
 341         if (WARN_ON(queue >= hw->queues))
 342                 return;
 343
 344         if (!refcounted)
 345                 local->q_stop_reasons[queue][reason] = 1;
 346         else
 347                 local->q_stop_reasons[queue][reason]++;
 348
 349         if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
 350                 return;
 351
 352         if (local->hw.queues < IEEE80211_NUM_ACS)
 353                 n_acs = 1;
 354
 355         rcu_read_lock();
 356         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 357                 int ac;
 358
 359                 if (!sdata->dev)
 360                         continue;
 361
 362                 for (ac = 0; ac < n_acs; ac++) {
 363                         if (sdata->vif.hw_queue[ac] == queue ||
 364                             sdata->vif.cab_queue == queue)
 365                                 netif_stop_subqueue(sdata->dev, ac);
 366                 }
 367         }
 368         rcu_read_unlock();
 369 }
 370
 371 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 372                                     enum queue_stop_reason reason,
 373                                     bool refcounted)
 374 {
 375         struct ieee80211_local *local = hw_to_local(hw);
 376         unsigned long flags;
 377
 378         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 379         __ieee80211_stop_queue(hw, queue, reason, refcounted);
 380         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 381 }
 382
 383 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 384 {
 385         ieee80211_stop_queue_by_reason(hw, queue,
 386                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 387                                        false);
 388 }
 389 EXPORT_SYMBOL(ieee80211_stop_queue);
 390
 391 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 392                                struct sk_buff *skb)
 393 {
 394         struct ieee80211_hw *hw = &local->hw;
 395         unsigned long flags;
 396         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 397         int queue = info->hw_queue;
 398
 399         if (WARN_ON(!info->control.vif)) {
 400                 ieee80211_free_txskb(&local->hw, skb);
 401                 return;
 402         }
 403
 404         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 405         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 406                                false);
 407         __skb_queue_tail(&local->pending[queue], skb);
 408         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 409                                false);
 410         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 411 }
 412
 413 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 414                                 struct sk_buff_head *skbs)
 415 {
 416         struct ieee80211_hw *hw = &local->hw;
 417         struct sk_buff *skb;
 418         unsigned long flags;
 419         int queue, i;
 420
 421         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 422         while ((skb = skb_dequeue(skbs))) {
 423                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 424
 425                 if (WARN_ON(!info->control.vif)) {
 426                         ieee80211_free_txskb(&local->hw, skb);
 427                         continue;
 428                 }
 429
 430                 queue = info->hw_queue;
 431
 432                 __ieee80211_stop_queue(hw, queue,
 433                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 434                                 false);
 435
 436                 __skb_queue_tail(&local->pending[queue], skb);
 437         }
 438
 439         for (i = 0; i < hw->queues; i++)
 440                 __ieee80211_wake_queue(hw, i,
 441                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 442                         false);
 443         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 444 }
 445
 446 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 447                                      unsigned long queues,
 448                                      enum queue_stop_reason reason,
 449                                      bool refcounted)
 450 {
 451         struct ieee80211_local *local = hw_to_local(hw);
 452         unsigned long flags;
 453         int i;
 454
 455         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 456
 457         for_each_set_bit(i, &queues, hw->queues)
 458                 __ieee80211_stop_queue(hw, i, reason, refcounted);
 459
 460         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 461 }
 462
 463 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 464 {
 465         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 466                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 467                                         false);
 468 }
 469 EXPORT_SYMBOL(ieee80211_stop_queues);
 470
 471 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 472 {
 473         struct ieee80211_local *local = hw_to_local(hw);
 474         unsigned long flags;
 475         int ret;
 476
 477         if (WARN_ON(queue >= hw->queues))
 478                 return true;
 479
 480         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 481         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 482                        &local->queue_stop_reasons[queue]);
 483         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 484         return ret;
 485 }
 486 EXPORT_SYMBOL(ieee80211_queue_stopped);
 487
 488 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 489                                      unsigned long queues,
 490                                      enum queue_stop_reason reason,
 491                                      bool refcounted)
 492 {
 493         struct ieee80211_local *local = hw_to_local(hw);
 494         unsigned long flags;
 495         int i;
 496
 497         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 498
 499         for_each_set_bit(i, &queues, hw->queues)
 500                 __ieee80211_wake_queue(hw, i, reason, refcounted);
 501
 502         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 503 }
 504
 505 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 506 {
 507         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 508                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 509                                         false);
 510 }
 511 EXPORT_SYMBOL(ieee80211_wake_queues);
 512
 513 static unsigned int
 514 ieee80211_get_vif_queues(struct ieee80211_local *local,
 515                          struct ieee80211_sub_if_data *sdata)
 516 {
 517         unsigned int queues;
 518
 519         if (sdata && ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
 520                 int ac;
 521
 522                 queues = 0;
 523
 524                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 525                         queues |= BIT(sdata->vif.hw_queue[ac]);
 526                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 527                         queues |= BIT(sdata->vif.cab_queue);
 528         } else {
 529                 /* all queues */
 530                 queues = BIT(local->hw.queues) - 1;
 531         }
 532
 533         return queues;
 534 }
 535
 536 void __ieee80211_flush_queues(struct ieee80211_local *local,
 537                               struct ieee80211_sub_if_data *sdata,
 538                               unsigned int queues, bool drop)
 539 {
 540         if (!local->ops->flush)
 541                 return;
 542
 543         /*
 544          * If no queue was set, or if the HW doesn't support
 545          * IEEE80211_HW_QUEUE_CONTROL - flush all queues
 546          */
 547         if (!queues || !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 548                 queues = ieee80211_get_vif_queues(local, sdata);
 549
 550         ieee80211_stop_queues_by_reason(&local->hw, queues,
 551                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 552                                         false);
 553
 554         drv_flush(local, sdata, queues, drop);
 555
 556         ieee80211_wake_queues_by_reason(&local->hw, queues,
 557                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 558                                         false);
 559 }
 560
 561 void ieee80211_flush_queues(struct ieee80211_local *local,
 562                             struct ieee80211_sub_if_data *sdata, bool drop)
 563 {
 564         __ieee80211_flush_queues(local, sdata, 0, drop);
 565 }
 566
 567 void ieee80211_stop_vif_queues(struct ieee80211_local *local,
 568                                struct ieee80211_sub_if_data *sdata,
 569                                enum queue_stop_reason reason)
 570 {
 571         ieee80211_stop_queues_by_reason(&local->hw,
 572                                         ieee80211_get_vif_queues(local, sdata),
 573                                         reason, true);
 574 }
 575
 576 void ieee80211_wake_vif_queues(struct ieee80211_local *local,
 577                                struct ieee80211_sub_if_data *sdata,
 578                                enum queue_stop_reason reason)
 579 {
 580         ieee80211_wake_queues_by_reason(&local->hw,
 581                                         ieee80211_get_vif_queues(local, sdata),
 582                                         reason, true);
 583 }
 584
 585 static void __iterate_interfaces(struct ieee80211_local *local,
 586                                  u32 iter_flags,
 587                                  void (*iterator)(void *data, u8 *mac,
 588                                                   struct ieee80211_vif *vif),
 589                                  void *data)
 590 {
 591         struct ieee80211_sub_if_data *sdata;
 592         bool active_only = iter_flags & IEEE80211_IFACE_ITER_ACTIVE;
 593
 594         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 595                 switch (sdata->vif.type) {
 596                 case NL80211_IFTYPE_MONITOR:
 597                         if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 598                                 continue;
 599                         break;
 600                 case NL80211_IFTYPE_AP_VLAN:
 601                         continue;
 602                 default:
 603                         break;
 604                 }
 605                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 606                     active_only && !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 607                         continue;
 608                 if (ieee80211_sdata_running(sdata) || !active_only)
 609                         iterator(data, sdata->vif.addr,
 610                                  &sdata->vif);
 611         }
 612
 613         sdata = rcu_dereference_check(local->monitor_sdata,
 614                                       lockdep_is_held(&local->iflist_mtx) ||
 615                                       lockdep_rtnl_is_held());
 616         if (sdata &&
 617             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL || !active_only ||
 618              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 619                 iterator(data, sdata->vif.addr, &sdata->vif);
 620 }
 621
 622 void ieee80211_iterate_interfaces(
 623         struct ieee80211_hw *hw, u32 iter_flags,
 624         void (*iterator)(void *data, u8 *mac,
 625                          struct ieee80211_vif *vif),
 626         void *data)
 627 {
 628         struct ieee80211_local *local = hw_to_local(hw);
 629
 630         mutex_lock(&local->iflist_mtx);
 631         __iterate_interfaces(local, iter_flags, iterator, data);
 632         mutex_unlock(&local->iflist_mtx);
 633 }
 634 EXPORT_SYMBOL_GPL(ieee80211_iterate_interfaces);
 635
 636 void ieee80211_iterate_active_interfaces_atomic(
 637         struct ieee80211_hw *hw, u32 iter_flags,
 638         void (*iterator)(void *data, u8 *mac,
 639                          struct ieee80211_vif *vif),
 640         void *data)
 641 {
 642         struct ieee80211_local *local = hw_to_local(hw);
 643
 644         rcu_read_lock();
 645         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
 646                              iterator, data);
 647         rcu_read_unlock();
 648 }
 649 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 650
 651 void ieee80211_iterate_active_interfaces_rtnl(
 652         struct ieee80211_hw *hw, u32 iter_flags,
 653         void (*iterator)(void *data, u8 *mac,
 654                          struct ieee80211_vif *vif),
 655         void *data)
 656 {
 657         struct ieee80211_local *local = hw_to_local(hw);
 658
 659         ASSERT_RTNL();
 660
 661         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
 662                              iterator, data);
 663 }
 664 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
 665
 666 static void __iterate_stations(struct ieee80211_local *local,
 667                                void (*iterator)(void *data,
 668                                                 struct ieee80211_sta *sta),
 669                                void *data)
 670 {
 671         struct sta_info *sta;
 672
 673         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 674                 if (!sta->uploaded)
 675                         continue;
 676
 677                 iterator(data, &sta->sta);
 678         }
 679 }
 680
 681 void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
 682                         void (*iterator)(void *data,
 683                                          struct ieee80211_sta *sta),
 684                         void *data)
 685 {
 686         struct ieee80211_local *local = hw_to_local(hw);
 687
 688         rcu_read_lock();
 689         __iterate_stations(local, iterator, data);
 690         rcu_read_unlock();
 691 }
 692 EXPORT_SYMBOL_GPL(ieee80211_iterate_stations_atomic);
 693
 694 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
 695 {
 696         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 697
 698         if (!ieee80211_sdata_running(sdata) ||
 699             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 700                 return NULL;
 701         return &sdata->vif;
 702 }
 703 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
 704
 705 struct wireless_dev *ieee80211_vif_to_wdev(struct ieee80211_vif *vif)
 706 {
 707         struct ieee80211_sub_if_data *sdata;
 708
 709         if (!vif)
 710                 return NULL;
 711
 712         sdata = vif_to_sdata(vif);
 713
 714         if (!ieee80211_sdata_running(sdata) ||
 715             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 716                 return NULL;
 717
 718         return &sdata->wdev;
 719 }
 720 EXPORT_SYMBOL_GPL(ieee80211_vif_to_wdev);
 721
 722 /*
 723  * Nothing should have been stuffed into the workqueue during
 724  * the suspend->resume cycle. Since we can't check each caller
 725  * of this function if we are already quiescing / suspended,
 726  * check here and don't WARN since this can actually happen when
 727  * the rx path (for example) is racing against __ieee80211_suspend
 728  * and suspending / quiescing was set after the rx path checked
 729  * them.
 730  */
 731 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 732 {
 733         if (local->quiescing || (local->suspended && !local->resuming)) {
 734                 pr_warn("queueing ieee80211 work while going to suspend\n");
 735                 return false;
 736         }
 737
 738         return true;
 739 }
 740
 741 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 742 {
 743         struct ieee80211_local *local = hw_to_local(hw);
 744
 745         if (!ieee80211_can_queue_work(local))
 746                 return;
 747
 748         queue_work(local->workqueue, work);
 749 }
 750 EXPORT_SYMBOL(ieee80211_queue_work);
 751
 752 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 753                                   struct delayed_work *dwork,
 754                                   unsigned long delay)
 755 {
 756         struct ieee80211_local *local = hw_to_local(hw);
 757
 758         if (!ieee80211_can_queue_work(local))
 759                 return;
 760
 761         queue_delayed_work(local->workqueue, dwork, delay);
 762 }
 763 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 764
 765 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 766                                struct ieee802_11_elems *elems,
 767                                u64 filter, u32 crc)
 768 {
 769         size_t left = len;
 770         const u8 *pos = start;
 771         bool calc_crc = filter != 0;
 772         DECLARE_BITMAP(seen_elems, 256);
 773         const u8 *ie;
 774
 775         bitmap_zero(seen_elems, 256);
 776         memset(elems, 0, sizeof(*elems));
 777         elems->ie_start = start;
 778         elems->total_len = len;
 779
 780         while (left >= 2) {
 781                 u8 id, elen;
 782                 bool elem_parse_failed;
 783
 784                 id = *pos++;
 785                 elen = *pos++;
 786                 left -= 2;
 787
 788                 if (elen > left) {
 789                         elems->parse_error = true;
 790                         break;
 791                 }
 792
 793                 switch (id) {
 794                 case WLAN_EID_SSID:
 795                 case WLAN_EID_SUPP_RATES:
 796                 case WLAN_EID_FH_PARAMS:
 797                 case WLAN_EID_DS_PARAMS:
 798                 case WLAN_EID_CF_PARAMS:
 799                 case WLAN_EID_TIM:
 800                 case WLAN_EID_IBSS_PARAMS:
 801                 case WLAN_EID_CHALLENGE:
 802                 case WLAN_EID_RSN:
 803                 case WLAN_EID_ERP_INFO:
 804                 case WLAN_EID_EXT_SUPP_RATES:
 805                 case WLAN_EID_HT_CAPABILITY:
 806                 case WLAN_EID_HT_OPERATION:
 807                 case WLAN_EID_VHT_CAPABILITY:
 808                 case WLAN_EID_VHT_OPERATION:
 809                 case WLAN_EID_MESH_ID:
 810                 case WLAN_EID_MESH_CONFIG:
 811                 case WLAN_EID_PEER_MGMT:
 812                 case WLAN_EID_PREQ:
 813                 case WLAN_EID_PREP:
 814                 case WLAN_EID_PERR:
 815                 case WLAN_EID_RANN:
 816                 case WLAN_EID_CHANNEL_SWITCH:
 817                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 818                 case WLAN_EID_COUNTRY:
 819                 case WLAN_EID_PWR_CONSTRAINT:
 820                 case WLAN_EID_TIMEOUT_INTERVAL:
 821                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 822                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 823                 case WLAN_EID_CHAN_SWITCH_PARAM:
 824                 case WLAN_EID_EXT_CAPABILITY:
 825                 case WLAN_EID_CHAN_SWITCH_TIMING:
 826                 case WLAN_EID_LINK_ID:
 827                 /*
 828                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 829                  * that if the content gets bigger it might be needed more than once
 830                  */
 831                         if (test_bit(id, seen_elems)) {
 832                                 elems->parse_error = true;
 833                                 left -= elen;
 834                                 pos += elen;
 835                                 continue;
 836                         }
 837                         break;
 838                 }
 839
 840                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 841                         crc = crc32_be(crc, pos - 2, elen + 2);
 842
 843                 elem_parse_failed = false;
 844
 845                 switch (id) {
 846                 case WLAN_EID_LINK_ID:
 847                         if (elen + 2 != sizeof(struct ieee80211_tdls_lnkie)) {
 848                                 elem_parse_failed = true;
 849                                 break;
 850                         }
 851                         elems->lnk_id = (void *)(pos - 2);
 852                         break;
 853                 case WLAN_EID_CHAN_SWITCH_TIMING:
 854                         if (elen != sizeof(struct ieee80211_ch_switch_timing)) {
 855                                 elem_parse_failed = true;
 856                                 break;
 857                         }
 858                         elems->ch_sw_timing = (void *)pos;
 859                         break;
 860                 case WLAN_EID_EXT_CAPABILITY:
 861                         elems->ext_capab = pos;
 862                         elems->ext_capab_len = elen;
 863                         break;
 864                 case WLAN_EID_SSID:
 865                         elems->ssid = pos;
 866                         elems->ssid_len = elen;
 867                         break;
 868                 case WLAN_EID_SUPP_RATES:
 869                         elems->supp_rates = pos;
 870                         elems->supp_rates_len = elen;
 871                         break;
 872                 case WLAN_EID_DS_PARAMS:
 873                         if (elen >= 1)
 874                                 elems->ds_params = pos;
 875                         else
 876                                 elem_parse_failed = true;
 877                         break;
 878                 case WLAN_EID_TIM:
 879                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 880                                 elems->tim = (void *)pos;
 881                                 elems->tim_len = elen;
 882                         } else
 883                                 elem_parse_failed = true;
 884                         break;
 885                 case WLAN_EID_CHALLENGE:
 886                         elems->challenge = pos;
 887                         elems->challenge_len = elen;
 888                         break;
 889                 case WLAN_EID_VENDOR_SPECIFIC:
 890                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 891                             pos[2] == 0xf2) {
 892                                 /* Microsoft OUI (00:50:F2) */
 893
 894                                 if (calc_crc)
 895                                         crc = crc32_be(crc, pos - 2, elen + 2);
 896
 897                                 if (elen >= 5 && pos[3] == 2) {
 898                                         /* OUI Type 2 - WMM IE */
 899                                         if (pos[4] == 0) {
 900                                                 elems->wmm_info = pos;
 901                                                 elems->wmm_info_len = elen;
 902                                         } else if (pos[4] == 1) {
 903                                                 elems->wmm_param = pos;
 904                                                 elems->wmm_param_len = elen;
 905                                         }
 906                                 }
 907                         }
 908                         break;
 909                 case WLAN_EID_RSN:
 910                         elems->rsn = pos;
 911                         elems->rsn_len = elen;
 912                         break;
 913                 case WLAN_EID_ERP_INFO:
 914                         if (elen >= 1)
 915                                 elems->erp_info = pos;
 916                         else
 917                                 elem_parse_failed = true;
 918                         break;
 919                 case WLAN_EID_EXT_SUPP_RATES:
 920                         elems->ext_supp_rates = pos;
 921                         elems->ext_supp_rates_len = elen;
 922                         break;
 923                 case WLAN_EID_HT_CAPABILITY:
 924                         if (elen >= sizeof(struct ieee80211_ht_cap))
 925                                 elems->ht_cap_elem = (void *)pos;
 926                         else
 927                                 elem_parse_failed = true;
 928                         break;
 929                 case WLAN_EID_HT_OPERATION:
 930                         if (elen >= sizeof(struct ieee80211_ht_operation))
 931                                 elems->ht_operation = (void *)pos;
 932                         else
 933                                 elem_parse_failed = true;
 934                         break;
 935                 case WLAN_EID_VHT_CAPABILITY:
 936                         if (elen >= sizeof(struct ieee80211_vht_cap))
 937                                 elems->vht_cap_elem = (void *)pos;
 938                         else
 939                                 elem_parse_failed = true;
 940                         break;
 941                 case WLAN_EID_VHT_OPERATION:
 942                         if (elen >= sizeof(struct ieee80211_vht_operation))
 943                                 elems->vht_operation = (void *)pos;
 944                         else
 945                                 elem_parse_failed = true;
 946                         break;
 947                 case WLAN_EID_OPMODE_NOTIF:
 948                         if (elen > 0)
 949                                 elems->opmode_notif = pos;
 950                         else
 951                                 elem_parse_failed = true;
 952                         break;
 953                 case WLAN_EID_MESH_ID:
 954                         elems->mesh_id = pos;
 955                         elems->mesh_id_len = elen;
 956                         break;
 957                 case WLAN_EID_MESH_CONFIG:
 958                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 959                                 elems->mesh_config = (void *)pos;
 960                         else
 961                                 elem_parse_failed = true;
 962                         break;
 963                 case WLAN_EID_PEER_MGMT:
 964                         elems->peering = pos;
 965                         elems->peering_len = elen;
 966                         break;
 967                 case WLAN_EID_MESH_AWAKE_WINDOW:
 968                         if (elen >= 2)
 969                                 elems->awake_window = (void *)pos;
 970                         break;
 971                 case WLAN_EID_PREQ:
 972                         elems->preq = pos;
 973                         elems->preq_len = elen;
 974                         break;
 975                 case WLAN_EID_PREP:
 976                         elems->prep = pos;
 977                         elems->prep_len = elen;
 978                         break;
 979                 case WLAN_EID_PERR:
 980                         elems->perr = pos;
 981                         elems->perr_len = elen;
 982                         break;
 983                 case WLAN_EID_RANN:
 984                         if (elen >= sizeof(struct ieee80211_rann_ie))
 985                                 elems->rann = (void *)pos;
 986                         else
 987                                 elem_parse_failed = true;
 988                         break;
 989                 case WLAN_EID_CHANNEL_SWITCH:
 990                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 991                                 elem_parse_failed = true;
 992                                 break;
 993                         }
 994                         elems->ch_switch_ie = (void *)pos;
 995                         break;
 996                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 997                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
 998                                 elem_parse_failed = true;
 999                                 break;
1000                         }
1001                         elems->ext_chansw_ie = (void *)pos;
1002                         break;
1003                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
1004                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
1005                                 elem_parse_failed = true;
1006                                 break;
1007                         }
1008                         elems->sec_chan_offs = (void *)pos;
1009                         break;
1010                 case WLAN_EID_CHAN_SWITCH_PARAM:
1011                         if (elen !=
1012                             sizeof(*elems->mesh_chansw_params_ie)) {
1013                                 elem_parse_failed = true;
1014                                 break;
1015                         }
1016                         elems->mesh_chansw_params_ie = (void *)pos;
1017                         break;
1018                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
1019                         if (!action ||
1020                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
1021                                 elem_parse_failed = true;
1022                                 break;
1023                         }
1024                         elems->wide_bw_chansw_ie = (void *)pos;
1025                         break;
1026                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
1027                         if (action) {
1028                                 elem_parse_failed = true;
1029                                 break;
1030                         }
1031                         /*
1032                          * This is a bit tricky, but as we only care about
1033                          * the wide bandwidth channel switch element, so
1034                          * just parse it out manually.
1035                          */
1036                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
1037                                               pos, elen);
1038                         if (ie) {
1039                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
1040                                         elems->wide_bw_chansw_ie =
1041                                                 (void *)(ie + 2);
1042                                 else
1043                                         elem_parse_failed = true;
1044                         }
1045                         break;
1046                 case WLAN_EID_COUNTRY:
1047                         elems->country_elem = pos;
1048                         elems->country_elem_len = elen;
1049                         break;
1050                 case WLAN_EID_PWR_CONSTRAINT:
1051                         if (elen != 1) {
1052                                 elem_parse_failed = true;
1053                                 break;
1054                         }
1055                         elems->pwr_constr_elem = pos;
1056                         break;
1057                 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
1058                         /* Lots of different options exist, but we only care
1059                          * about the Dynamic Transmit Power Control element.
1060                          * First check for the Cisco OUI, then for the DTPC
1061                          * tag (0x00).
1062                          */
1063                         if (elen < 4) {
1064                                 elem_parse_failed = true;
1065                                 break;
1066                         }
1067
1068                         if (pos[0] != 0x00 || pos[1] != 0x40 ||
1069                             pos[2] != 0x96 || pos[3] != 0x00)
1070                                 break;
1071
1072                         if (elen != 6) {
1073                                 elem_parse_failed = true;
1074                                 break;
1075                         }
1076
1077                         if (calc_crc)
1078                                 crc = crc32_be(crc, pos - 2, elen + 2);
1079
1080                         elems->cisco_dtpc_elem = pos;
1081                         break;
1082                 case WLAN_EID_TIMEOUT_INTERVAL:
1083                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
1084                                 elems->timeout_int = (void *)pos;
1085                         else
1086                                 elem_parse_failed = true;
1087                         break;
1088                 default:
1089                         break;
1090                 }
1091
1092                 if (elem_parse_failed)
1093                         elems->parse_error = true;
1094                 else
1095                         __set_bit(id, seen_elems);
1096
1097                 left -= elen;
1098                 pos += elen;
1099         }
1100
1101         if (left != 0)
1102                 elems->parse_error = true;
1103
1104         return crc;
1105 }
1106
1107 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
1108                                bool bss_notify)
1109 {
1110         struct ieee80211_local *local = sdata->local;
1111         struct ieee80211_tx_queue_params qparam;
1112         struct ieee80211_chanctx_conf *chanctx_conf;
1113         int ac;
1114         bool use_11b, enable_qos;
1115         bool is_ocb; /* Use another EDCA parameters if dot11OCBActivated=true */
1116         int aCWmin, aCWmax;
1117
1118         if (!local->ops->conf_tx)
1119                 return;
1120
1121         if (local->hw.queues < IEEE80211_NUM_ACS)
1122                 return;
1123
1124         memset(&qparam, 0, sizeof(qparam));
1125
1126         rcu_read_lock();
1127         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1128         use_11b = (chanctx_conf &&
1129                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1130                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1131         rcu_read_unlock();
1132
1133         /*
1134          * By default disable QoS in STA mode for old access points, which do
1135          * not support 802.11e. New APs will provide proper queue parameters,
1136          * that we will configure later.
1137          */
1138         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
1139
1140         is_ocb = (sdata->vif.type == NL80211_IFTYPE_OCB);
1141
1142         /* Set defaults according to 802.11-2007 Table 7-37 */
1143         aCWmax = 1023;
1144         if (use_11b)
1145                 aCWmin = 31;
1146         else
1147                 aCWmin = 15;
1148
1149         /* Confiure old 802.11b/g medium access rules. */
1150         qparam.cw_max = aCWmax;
1151         qparam.cw_min = aCWmin;
1152         qparam.txop = 0;
1153         qparam.aifs = 2;
1154
1155         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1156                 /* Update if QoS is enabled. */
1157                 if (enable_qos) {
1158                         switch (ac) {
1159                         case IEEE80211_AC_BK:
1160                                 qparam.cw_max = aCWmax;
1161                                 qparam.cw_min = aCWmin;
1162                                 qparam.txop = 0;
1163                                 if (is_ocb)
1164                                         qparam.aifs = 9;
1165                                 else
1166                                         qparam.aifs = 7;
1167                                 break;
1168                         /* never happens but let's not leave undefined */
1169                         default:
1170                         case IEEE80211_AC_BE:
1171                                 qparam.cw_max = aCWmax;
1172                                 qparam.cw_min = aCWmin;
1173                                 qparam.txop = 0;
1174                                 if (is_ocb)
1175                                         qparam.aifs = 6;
1176                                 else
1177                                         qparam.aifs = 3;
1178                                 break;
1179                         case IEEE80211_AC_VI:
1180                                 qparam.cw_max = aCWmin;
1181                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1182                                 if (is_ocb)
1183                                         qparam.txop = 0;
1184                                 else if (use_11b)
1185                                         qparam.txop = 6016/32;
1186                                 else
1187                                         qparam.txop = 3008/32;
1188
1189                                 if (is_ocb)
1190                                         qparam.aifs = 3;
1191                                 else
1192                                         qparam.aifs = 2;
1193                                 break;
1194                         case IEEE80211_AC_VO:
1195                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1196                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1197                                 if (is_ocb)
1198                                         qparam.txop = 0;
1199                                 else if (use_11b)
1200                                         qparam.txop = 3264/32;
1201                                 else
1202                                         qparam.txop = 1504/32;
1203                                 qparam.aifs = 2;
1204                                 break;
1205                         }
1206                 }
1207
1208                 qparam.uapsd = false;
1209
1210                 sdata->tx_conf[ac] = qparam;
1211                 drv_conf_tx(local, sdata, ac, &qparam);
1212         }
1213
1214         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1215             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1216                 sdata->vif.bss_conf.qos = enable_qos;
1217                 if (bss_notify)
1218                         ieee80211_bss_info_change_notify(sdata,
1219                                                          BSS_CHANGED_QOS);
1220         }
1221 }
1222
1223 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1224                          u16 transaction, u16 auth_alg, u16 status,
1225                          const u8 *extra, size_t extra_len, const u8 *da,
1226                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1227                          u32 tx_flags)
1228 {
1229         struct ieee80211_local *local = sdata->local;
1230         struct sk_buff *skb;
1231         struct ieee80211_mgmt *mgmt;
1232         int err;
1233
1234         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1235         skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
1236                             24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
1237         if (!skb)
1238                 return;
1239
1240         skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
1241
1242         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1243         memset(mgmt, 0, 24 + 6);
1244         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1245                                           IEEE80211_STYPE_AUTH);
1246         memcpy(mgmt->da, da, ETH_ALEN);
1247         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1248         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1249         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1250         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1251         mgmt->u.auth.status_code = cpu_to_le16(status);
1252         if (extra)
1253                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1254
1255         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1256                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1257                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1258                 WARN_ON(err);
1259         }
1260
1261         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1262                                         tx_flags;
1263         ieee80211_tx_skb(sdata, skb);
1264 }
1265
1266 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1267                                     const u8 *bssid, u16 stype, u16 reason,
1268                                     bool send_frame, u8 *frame_buf)
1269 {
1270         struct ieee80211_local *local = sdata->local;
1271         struct sk_buff *skb;
1272         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1273
1274         /* build frame */
1275         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1276         mgmt->duration = 0; /* initialize only */
1277         mgmt->seq_ctrl = 0; /* initialize only */
1278         memcpy(mgmt->da, bssid, ETH_ALEN);
1279         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1280         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1281         /* u.deauth.reason_code == u.disassoc.reason_code */
1282         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1283
1284         if (send_frame) {
1285                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1286                                     IEEE80211_DEAUTH_FRAME_LEN);
1287                 if (!skb)
1288                         return;
1289
1290                 skb_reserve(skb, local->hw.extra_tx_headroom);
1291
1292                 /* copy in frame */
1293                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1294                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1295
1296                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1297                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1298                         IEEE80211_SKB_CB(skb)->flags |=
1299                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1300
1301                 ieee80211_tx_skb(sdata, skb);
1302         }
1303 }
1304
1305 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
1306                                          u8 *buffer, size_t buffer_len,
1307                                          const u8 *ie, size_t ie_len,
1308                                          enum ieee80211_band band,
1309                                          u32 rate_mask,
1310                                          struct cfg80211_chan_def *chandef,
1311                                          size_t *offset)
1312 {
1313         struct ieee80211_supported_band *sband;
1314         u8 *pos = buffer, *end = buffer + buffer_len;
1315         size_t noffset;
1316         int supp_rates_len, i;
1317         u8 rates[32];
1318         int num_rates;
1319         int ext_rates_len;
1320         int shift;
1321         u32 rate_flags;
1322         bool have_80mhz = false;
1323
1324         *offset = 0;
1325
1326         sband = local->hw.wiphy->bands[band];
1327         if (WARN_ON_ONCE(!sband))
1328                 return 0;
1329
1330         rate_flags = ieee80211_chandef_rate_flags(chandef);
1331         shift = ieee80211_chandef_get_shift(chandef);
1332
1333         num_rates = 0;
1334         for (i = 0; i < sband->n_bitrates; i++) {
1335                 if ((BIT(i) & rate_mask) == 0)
1336                         continue; /* skip rate */
1337                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1338                         continue;
1339
1340                 rates[num_rates++] =
1341                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1342                                           (1 << shift) * 5);
1343         }
1344
1345         supp_rates_len = min_t(int, num_rates, 8);
1346
1347         if (end - pos < 2 + supp_rates_len)
1348                 goto out_err;
1349         *pos++ = WLAN_EID_SUPP_RATES;
1350         *pos++ = supp_rates_len;
1351         memcpy(pos, rates, supp_rates_len);
1352         pos += supp_rates_len;
1353
1354         /* insert "request information" if in custom IEs */
1355         if (ie && ie_len) {
1356                 static const u8 before_extrates[] = {
1357                         WLAN_EID_SSID,
1358                         WLAN_EID_SUPP_RATES,
1359                         WLAN_EID_REQUEST,
1360                 };
1361                 noffset = ieee80211_ie_split(ie, ie_len,
1362                                              before_extrates,
1363                                              ARRAY_SIZE(before_extrates),
1364                                              *offset);
1365                 if (end - pos < noffset - *offset)
1366                         goto out_err;
1367                 memcpy(pos, ie + *offset, noffset - *offset);
1368                 pos += noffset - *offset;
1369                 *offset = noffset;
1370         }
1371
1372         ext_rates_len = num_rates - supp_rates_len;
1373         if (ext_rates_len > 0) {
1374                 if (end - pos < 2 + ext_rates_len)
1375                         goto out_err;
1376                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1377                 *pos++ = ext_rates_len;
1378                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1379                 pos += ext_rates_len;
1380         }
1381
1382         if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1383                 if (end - pos < 3)
1384                         goto out_err;
1385                 *pos++ = WLAN_EID_DS_PARAMS;
1386                 *pos++ = 1;
1387                 *pos++ = ieee80211_frequency_to_channel(
1388                                 chandef->chan->center_freq);
1389         }
1390
1391         /* insert custom IEs that go before HT */
1392         if (ie && ie_len) {
1393                 static const u8 before_ht[] = {
1394                         WLAN_EID_SSID,
1395                         WLAN_EID_SUPP_RATES,
1396                         WLAN_EID_REQUEST,
1397                         WLAN_EID_EXT_SUPP_RATES,
1398                         WLAN_EID_DS_PARAMS,
1399                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1400                 };
1401                 noffset = ieee80211_ie_split(ie, ie_len,
1402                                              before_ht, ARRAY_SIZE(before_ht),
1403                                              *offset);
1404                 if (end - pos < noffset - *offset)
1405                         goto out_err;
1406                 memcpy(pos, ie + *offset, noffset - *offset);
1407                 pos += noffset - *offset;
1408                 *offset = noffset;
1409         }
1410
1411         if (sband->ht_cap.ht_supported) {
1412                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1413                         goto out_err;
1414                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1415                                                 sband->ht_cap.cap);
1416         }
1417
1418         /*
1419          * If adding more here, adjust code in main.c
1420          * that calculates local->scan_ies_len.
1421          */
1422
1423         /* insert custom IEs that go before VHT */
1424         if (ie && ie_len) {
1425                 static const u8 before_vht[] = {
1426                         WLAN_EID_SSID,
1427                         WLAN_EID_SUPP_RATES,
1428                         WLAN_EID_REQUEST,
1429                         WLAN_EID_EXT_SUPP_RATES,
1430                         WLAN_EID_DS_PARAMS,
1431                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1432                         WLAN_EID_HT_CAPABILITY,
1433                         WLAN_EID_BSS_COEX_2040,
1434                         WLAN_EID_EXT_CAPABILITY,
1435                         WLAN_EID_SSID_LIST,
1436                         WLAN_EID_CHANNEL_USAGE,
1437                         WLAN_EID_INTERWORKING,
1438                         /* mesh ID can't happen here */
1439                         /* 60 GHz can't happen here right now */
1440                 };
1441                 noffset = ieee80211_ie_split(ie, ie_len,
1442                                              before_vht, ARRAY_SIZE(before_vht),
1443                                              *offset);
1444                 if (end - pos < noffset - *offset)
1445                         goto out_err;
1446                 memcpy(pos, ie + *offset, noffset - *offset);
1447                 pos += noffset - *offset;
1448                 *offset = noffset;
1449         }
1450
1451         /* Check if any channel in this sband supports at least 80 MHz */
1452         for (i = 0; i < sband->n_channels; i++) {
1453                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
1454                                                 IEEE80211_CHAN_NO_80MHZ))
1455                         continue;
1456
1457                 have_80mhz = true;
1458                 break;
1459         }
1460
1461         if (sband->vht_cap.vht_supported && have_80mhz) {
1462                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1463                         goto out_err;
1464                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1465                                                  sband->vht_cap.cap);
1466         }
1467
1468         return pos - buffer;
1469  out_err:
1470         WARN_ONCE(1, "not enough space for preq IEs\n");
1471         return pos - buffer;
1472 }
1473
1474 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1475                              size_t buffer_len,
1476                              struct ieee80211_scan_ies *ie_desc,
1477                              const u8 *ie, size_t ie_len,
1478                              u8 bands_used, u32 *rate_masks,
1479                              struct cfg80211_chan_def *chandef)
1480 {
1481         size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
1482         int i;
1483
1484         memset(ie_desc, 0, sizeof(*ie_desc));
1485
1486         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1487                 if (bands_used & BIT(i)) {
1488                         pos += ieee80211_build_preq_ies_band(local,
1489                                                              buffer + pos,
1490                                                              buffer_len - pos,
1491                                                              ie, ie_len, i,
1492                                                              rate_masks[i],
1493                                                              chandef,
1494                                                              &custom_ie_offset);
1495                         ie_desc->ies[i] = buffer + old_pos;
1496                         ie_desc->len[i] = pos - old_pos;
1497                         old_pos = pos;
1498                 }
1499         }
1500
1501         /* add any remaining custom IEs */
1502         if (ie && ie_len) {
1503                 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
1504                               "not enough space for preq custom IEs\n"))
1505                         return pos;
1506                 memcpy(buffer + pos, ie + custom_ie_offset,
1507                        ie_len - custom_ie_offset);
1508                 ie_desc->common_ies = buffer + pos;
1509                 ie_desc->common_ie_len = ie_len - custom_ie_offset;
1510                 pos += ie_len - custom_ie_offset;
1511         }
1512
1513         return pos;
1514 };
1515
1516 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1517                                           const u8 *src, const u8 *dst,
1518                                           u32 ratemask,
1519                                           struct ieee80211_channel *chan,
1520                                           const u8 *ssid, size_t ssid_len,
1521                                           const u8 *ie, size_t ie_len,
1522                                           bool directed)
1523 {
1524         struct ieee80211_local *local = sdata->local;
1525         struct cfg80211_chan_def chandef;
1526         struct sk_buff *skb;
1527         struct ieee80211_mgmt *mgmt;
1528         int ies_len;
1529         u32 rate_masks[IEEE80211_NUM_BANDS] = {};
1530         struct ieee80211_scan_ies dummy_ie_desc;
1531
1532         /*
1533          * Do not send DS Channel parameter for directed probe requests
1534          * in order to maximize the chance that we get a response.  Some
1535          * badly-behaved APs don't respond when this parameter is included.
1536          */
1537         chandef.width = sdata->vif.bss_conf.chandef.width;
1538         if (directed)
1539                 chandef.chan = NULL;
1540         else
1541                 chandef.chan = chan;
1542
1543         skb = ieee80211_probereq_get(&local->hw, src, ssid, ssid_len,
1544                                      100 + ie_len);
1545         if (!skb)
1546                 return NULL;
1547
1548         rate_masks[chan->band] = ratemask;
1549         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1550                                            skb_tailroom(skb), &dummy_ie_desc,
1551                                            ie, ie_len, BIT(chan->band),
1552                                            rate_masks, &chandef);
1553         skb_put(skb, ies_len);
1554
1555         if (dst) {
1556                 mgmt = (struct ieee80211_mgmt *) skb->data;
1557                 memcpy(mgmt->da, dst, ETH_ALEN);
1558                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1559         }
1560
1561         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1562
1563         return skb;
1564 }
1565
1566 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata,
1567                               const u8 *src, const u8 *dst,
1568                               const u8 *ssid, size_t ssid_len,
1569                               const u8 *ie, size_t ie_len,
1570                               u32 ratemask, bool directed, u32 tx_flags,
1571                               struct ieee80211_channel *channel, bool scan)
1572 {
1573         struct sk_buff *skb;
1574
1575         skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
1576                                         ssid, ssid_len,
1577                                         ie, ie_len, directed);
1578         if (skb) {
1579                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1580                 if (scan)
1581                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1582                 else
1583                         ieee80211_tx_skb(sdata, skb);
1584         }
1585 }
1586
1587 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1588                             struct ieee802_11_elems *elems,
1589                             enum ieee80211_band band, u32 *basic_rates)
1590 {
1591         struct ieee80211_supported_band *sband;
1592         size_t num_rates;
1593         u32 supp_rates, rate_flags;
1594         int i, j, shift;
1595         sband = sdata->local->hw.wiphy->bands[band];
1596
1597         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1598         shift = ieee80211_vif_get_shift(&sdata->vif);
1599
1600         if (WARN_ON(!sband))
1601                 return 1;
1602
1603         num_rates = sband->n_bitrates;
1604         supp_rates = 0;
1605         for (i = 0; i < elems->supp_rates_len +
1606                      elems->ext_supp_rates_len; i++) {
1607                 u8 rate = 0;
1608                 int own_rate;
1609                 bool is_basic;
1610                 if (i < elems->supp_rates_len)
1611                         rate = elems->supp_rates[i];
1612                 else if (elems->ext_supp_rates)
1613                         rate = elems->ext_supp_rates
1614                                 [i - elems->supp_rates_len];
1615                 own_rate = 5 * (rate & 0x7f);
1616                 is_basic = !!(rate & 0x80);
1617
1618                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1619                         continue;
1620
1621                 for (j = 0; j < num_rates; j++) {
1622                         int brate;
1623                         if ((rate_flags & sband->bitrates[j].flags)
1624                             != rate_flags)
1625                                 continue;
1626
1627                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1628                                              1 << shift);
1629
1630                         if (brate == own_rate) {
1631                                 supp_rates |= BIT(j);
1632                                 if (basic_rates && is_basic)
1633                                         *basic_rates |= BIT(j);
1634                         }
1635                 }
1636         }
1637         return supp_rates;
1638 }
1639
1640 void ieee80211_stop_device(struct ieee80211_local *local)
1641 {
1642         ieee80211_led_radio(local, false);
1643         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1644
1645         cancel_work_sync(&local->reconfig_filter);
1646
1647         flush_workqueue(local->workqueue);
1648         drv_stop(local);
1649 }
1650
1651 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1652 {
1653         struct ieee80211_sub_if_data *sdata;
1654         struct ieee80211_chanctx *ctx;
1655
1656         /*
1657          * We get here if during resume the device can't be restarted properly.
1658          * We might also get here if this happens during HW reset, which is a
1659          * slightly different situation and we need to drop all connections in
1660          * the latter case.
1661          *
1662          * Ask cfg80211 to turn off all interfaces, this will result in more
1663          * warnings but at least we'll then get into a clean stopped state.
1664          */
1665
1666         local->resuming = false;
1667         local->suspended = false;
1668         local->in_reconfig = false;
1669
1670         /* scheduled scan clearly can't be running any more, but tell
1671          * cfg80211 and clear local state
1672          */
1673         ieee80211_sched_scan_end(local);
1674
1675         list_for_each_entry(sdata, &local->interfaces, list)
1676                 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1677
1678         /* Mark channel contexts as not being in the driver any more to avoid
1679          * removing them from the driver during the shutdown process...
1680          */
1681         mutex_lock(&local->chanctx_mtx);
1682         list_for_each_entry(ctx, &local->chanctx_list, list)
1683                 ctx->driver_present = false;
1684         mutex_unlock(&local->chanctx_mtx);
1685
1686         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1687 }
1688
1689 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1690                                      struct ieee80211_sub_if_data *sdata)
1691 {
1692         struct ieee80211_chanctx_conf *conf;
1693         struct ieee80211_chanctx *ctx;
1694
1695         if (!local->use_chanctx)
1696                 return;
1697
1698         mutex_lock(&local->chanctx_mtx);
1699         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1700                                          lockdep_is_held(&local->chanctx_mtx));
1701         if (conf) {
1702                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1703                 drv_assign_vif_chanctx(local, sdata, ctx);
1704         }
1705         mutex_unlock(&local->chanctx_mtx);
1706 }
1707
1708 int ieee80211_reconfig(struct ieee80211_local *local)
1709 {
1710         struct ieee80211_hw *hw = &local->hw;
1711         struct ieee80211_sub_if_data *sdata;
1712         struct ieee80211_chanctx *ctx;
1713         struct sta_info *sta;
1714         int res, i;
1715         bool reconfig_due_to_wowlan = false;
1716         struct ieee80211_sub_if_data *sched_scan_sdata;
1717         struct cfg80211_sched_scan_request *sched_scan_req;
1718         bool sched_scan_stopped = false;
1719         bool suspended = local->suspended;
1720
1721         /* nothing to do if HW shouldn't run */
1722         if (!local->open_count)
1723                 goto wake_up;
1724
1725 #ifdef CONFIG_PM
1726         if (suspended)
1727                 local->resuming = true;
1728
1729         if (local->wowlan) {
1730                 /*
1731                  * In the wowlan case, both mac80211 and the device
1732                  * are functional when the resume op is called, so
1733                  * clear local->suspended so the device could operate
1734                  * normally (e.g. pass rx frames).
1735                  */
1736                 local->suspended = false;
1737                 res = drv_resume(local);
1738                 local->wowlan = false;
1739                 if (res < 0) {
1740                         local->resuming = false;
1741                         return res;
1742                 }
1743                 if (res == 0)
1744                         goto wake_up;
1745                 WARN_ON(res > 1);
1746                 /*
1747                  * res is 1, which means the driver requested
1748                  * to go through a regular reset on wakeup.
1749                  * restore local->suspended in this case.
1750                  */
1751                 reconfig_due_to_wowlan = true;
1752                 local->suspended = true;
1753         }
1754 #endif
1755
1756         /*
1757          * In case of hw_restart during suspend (without wowlan),
1758          * cancel restart work, as we are reconfiguring the device
1759          * anyway.
1760          * Note that restart_work is scheduled on a frozen workqueue,
1761          * so we can't deadlock in this case.
1762          */
1763         if (suspended && local->in_reconfig && !reconfig_due_to_wowlan)
1764                 cancel_work_sync(&local->restart_work);
1765
1766         local->started = false;
1767
1768         /*
1769          * Upon resume hardware can sometimes be goofy due to
1770          * various platform / driver / bus issues, so restarting
1771          * the device may at times not work immediately. Propagate
1772          * the error.
1773          */
1774         res = drv_start(local);
1775         if (res) {
1776                 if (suspended)
1777                         WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1778                 else
1779                         WARN(1, "Hardware became unavailable during restart.\n");
1780                 ieee80211_handle_reconfig_failure(local);
1781                 return res;
1782         }
1783
1784         /* setup fragmentation threshold */
1785         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1786
1787         /* setup RTS threshold */
1788         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1789
1790         /* reset coverage class */
1791         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1792
1793         ieee80211_led_radio(local, true);
1794         ieee80211_mod_tpt_led_trig(local,
1795                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1796
1797         /* add interfaces */
1798         sdata = rtnl_dereference(local->monitor_sdata);
1799         if (sdata) {
1800                 /* in HW restart it exists already */
1801                 WARN_ON(local->resuming);
1802                 res = drv_add_interface(local, sdata);
1803                 if (WARN_ON(res)) {
1804                         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1805                         synchronize_net();
1806                         kfree(sdata);
1807                 }
1808         }
1809
1810         list_for_each_entry(sdata, &local->interfaces, list) {
1811                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1812                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1813                     ieee80211_sdata_running(sdata)) {
1814                         res = drv_add_interface(local, sdata);
1815                         if (WARN_ON(res))
1816                                 break;
1817                 }
1818         }
1819
1820         /* If adding any of the interfaces failed above, roll back and
1821          * report failure.
1822          */
1823         if (res) {
1824                 list_for_each_entry_continue_reverse(sdata, &local->interfaces,
1825                                                      list)
1826                         if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1827                             sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1828                             ieee80211_sdata_running(sdata))
1829                                 drv_remove_interface(local, sdata);
1830                 ieee80211_handle_reconfig_failure(local);
1831                 return res;
1832         }
1833
1834         /* add channel contexts */
1835         if (local->use_chanctx) {
1836                 mutex_lock(&local->chanctx_mtx);
1837                 list_for_each_entry(ctx, &local->chanctx_list, list)
1838                         if (ctx->replace_state !=
1839                             IEEE80211_CHANCTX_REPLACES_OTHER)
1840                                 WARN_ON(drv_add_chanctx(local, ctx));
1841                 mutex_unlock(&local->chanctx_mtx);
1842
1843                 list_for_each_entry(sdata, &local->interfaces, list) {
1844                         if (!ieee80211_sdata_running(sdata))
1845                                 continue;
1846                         ieee80211_assign_chanctx(local, sdata);
1847                 }
1848
1849                 sdata = rtnl_dereference(local->monitor_sdata);
1850                 if (sdata && ieee80211_sdata_running(sdata))
1851                         ieee80211_assign_chanctx(local, sdata);
1852         }
1853
1854         /* add STAs back */
1855         mutex_lock(&local->sta_mtx);
1856         list_for_each_entry(sta, &local->sta_list, list) {
1857                 enum ieee80211_sta_state state;
1858
1859                 if (!sta->uploaded)
1860                         continue;
1861
1862                 /* AP-mode stations will be added later */
1863                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1864                         continue;
1865
1866                 for (state = IEEE80211_STA_NOTEXIST;
1867                      state < sta->sta_state; state++)
1868                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1869                                               state + 1));
1870         }
1871         mutex_unlock(&local->sta_mtx);
1872
1873         /* reconfigure tx conf */
1874         if (hw->queues >= IEEE80211_NUM_ACS) {
1875                 list_for_each_entry(sdata, &local->interfaces, list) {
1876                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1877                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1878                             !ieee80211_sdata_running(sdata))
1879                                 continue;
1880
1881                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1882                                 drv_conf_tx(local, sdata, i,
1883                                             &sdata->tx_conf[i]);
1884                 }
1885         }
1886
1887         /* reconfigure hardware */
1888         ieee80211_hw_config(local, ~0);
1889
1890         ieee80211_configure_filter(local);
1891
1892         /* Finally also reconfigure all the BSS information */
1893         list_for_each_entry(sdata, &local->interfaces, list) {
1894                 u32 changed;
1895
1896                 if (!ieee80211_sdata_running(sdata))
1897                         continue;
1898
1899                 /* common change flags for all interface types */
1900                 changed = BSS_CHANGED_ERP_CTS_PROT |
1901                           BSS_CHANGED_ERP_PREAMBLE |
1902                           BSS_CHANGED_ERP_SLOT |
1903                           BSS_CHANGED_HT |
1904                           BSS_CHANGED_BASIC_RATES |
1905                           BSS_CHANGED_BEACON_INT |
1906                           BSS_CHANGED_BSSID |
1907                           BSS_CHANGED_CQM |
1908                           BSS_CHANGED_QOS |
1909                           BSS_CHANGED_IDLE |
1910                           BSS_CHANGED_TXPOWER;
1911
1912                 switch (sdata->vif.type) {
1913                 case NL80211_IFTYPE_STATION:
1914                         changed |= BSS_CHANGED_ASSOC |
1915                                    BSS_CHANGED_ARP_FILTER |
1916                                    BSS_CHANGED_PS;
1917
1918                         /* Re-send beacon info report to the driver */
1919                         if (sdata->u.mgd.have_beacon)
1920                                 changed |= BSS_CHANGED_BEACON_INFO;
1921
1922                         sdata_lock(sdata);
1923                         ieee80211_bss_info_change_notify(sdata, changed);
1924                         sdata_unlock(sdata);
1925                         break;
1926                 case NL80211_IFTYPE_OCB:
1927                         changed |= BSS_CHANGED_OCB;
1928                         ieee80211_bss_info_change_notify(sdata, changed);
1929                         break;
1930                 case NL80211_IFTYPE_ADHOC:
1931                         changed |= BSS_CHANGED_IBSS;
1932                         /* fall through */
1933                 case NL80211_IFTYPE_AP:
1934                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1935
1936                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1937                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1938
1939                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1940                                         drv_start_ap(local, sdata);
1941                         }
1942
1943                         /* fall through */
1944                 case NL80211_IFTYPE_MESH_POINT:
1945                         if (sdata->vif.bss_conf.enable_beacon) {
1946                                 changed |= BSS_CHANGED_BEACON |
1947                                            BSS_CHANGED_BEACON_ENABLED;
1948                                 ieee80211_bss_info_change_notify(sdata, changed);
1949                         }
1950                         break;
1951                 case NL80211_IFTYPE_WDS:
1952                 case NL80211_IFTYPE_AP_VLAN:
1953                 case NL80211_IFTYPE_MONITOR:
1954                 case NL80211_IFTYPE_P2P_DEVICE:
1955                         /* nothing to do */
1956                         break;
1957                 case NL80211_IFTYPE_UNSPECIFIED:
1958                 case NUM_NL80211_IFTYPES:
1959                 case NL80211_IFTYPE_P2P_CLIENT:
1960                 case NL80211_IFTYPE_P2P_GO:
1961                         WARN_ON(1);
1962                         break;
1963                 }
1964         }
1965
1966         ieee80211_recalc_ps(local);
1967
1968         /*
1969          * The sta might be in psm against the ap (e.g. because
1970          * this was the state before a hw restart), so we
1971          * explicitly send a null packet in order to make sure
1972          * it'll sync against the ap (and get out of psm).
1973          */
1974         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1975                 list_for_each_entry(sdata, &local->interfaces, list) {
1976                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1977                                 continue;
1978                         if (!sdata->u.mgd.associated)
1979                                 continue;
1980
1981                         ieee80211_send_nullfunc(local, sdata, false);
1982                 }
1983         }
1984
1985         /* APs are now beaconing, add back stations */
1986         mutex_lock(&local->sta_mtx);
1987         list_for_each_entry(sta, &local->sta_list, list) {
1988                 enum ieee80211_sta_state state;
1989
1990                 if (!sta->uploaded)
1991                         continue;
1992
1993                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1994                         continue;
1995
1996                 for (state = IEEE80211_STA_NOTEXIST;
1997                      state < sta->sta_state; state++)
1998                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1999                                               state + 1));
2000         }
2001         mutex_unlock(&local->sta_mtx);
2002
2003         /* add back keys */
2004         list_for_each_entry(sdata, &local->interfaces, list)
2005                 ieee80211_reset_crypto_tx_tailroom(sdata);
2006
2007         list_for_each_entry(sdata, &local->interfaces, list)
2008                 if (ieee80211_sdata_running(sdata))
2009                         ieee80211_enable_keys(sdata);
2010
2011         /* Reconfigure sched scan if it was interrupted by FW restart */
2012         mutex_lock(&local->mtx);
2013         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
2014                                                 lockdep_is_held(&local->mtx));
2015         sched_scan_req = rcu_dereference_protected(local->sched_scan_req,
2016                                                 lockdep_is_held(&local->mtx));
2017         if (sched_scan_sdata && sched_scan_req)
2018                 /*
2019                  * Sched scan stopped, but we don't want to report it. Instead,
2020                  * we're trying to reschedule. However, if more than one scan
2021                  * plan was set, we cannot reschedule since we don't know which
2022                  * scan plan was currently running (and some scan plans may have
2023                  * already finished).
2024                  */
2025                 if (sched_scan_req->n_scan_plans > 1 ||
2026                     __ieee80211_request_sched_scan_start(sched_scan_sdata,
2027                                                          sched_scan_req))
2028                         sched_scan_stopped = true;
2029         mutex_unlock(&local->mtx);
2030
2031         if (sched_scan_stopped)
2032                 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
2033
2034  wake_up:
2035         local->in_reconfig = false;
2036         barrier();
2037
2038         if (local->monitors == local->open_count && local->monitors > 0)
2039                 ieee80211_add_virtual_monitor(local);
2040
2041         /*
2042          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
2043          * sessions can be established after a resume.
2044          *
2045          * Also tear down aggregation sessions since reconfiguring
2046          * them in a hardware restart scenario is not easily done
2047          * right now, and the hardware will have lost information
2048          * about the sessions, but we and the AP still think they
2049          * are active. This is really a workaround though.
2050          */
2051         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
2052                 mutex_lock(&local->sta_mtx);
2053
2054                 list_for_each_entry(sta, &local->sta_list, list) {
2055                         if (!local->resuming)
2056                                 ieee80211_sta_tear_down_BA_sessions(
2057                                                 sta, AGG_STOP_LOCAL_REQUEST);
2058                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
2059                 }
2060
2061                 mutex_unlock(&local->sta_mtx);
2062         }
2063
2064         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
2065                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
2066                                         false);
2067
2068         /*
2069          * If this is for hw restart things are still running.
2070          * We may want to change that later, however.
2071          */
2072         if (local->open_count && (!suspended || reconfig_due_to_wowlan))
2073                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_RESTART);
2074
2075         if (!suspended)
2076                 return 0;
2077
2078 #ifdef CONFIG_PM
2079         /* first set suspended false, then resuming */
2080         local->suspended = false;
2081         mb();
2082         local->resuming = false;
2083
2084         /* It's possible that we don't handle the scan completion in
2085          * time during suspend, so if it's still marked as completed
2086          * here, queue the work and flush it to clean things up.
2087          * Instead of calling the worker function directly here, we
2088          * really queue it to avoid potential races with other flows
2089          * scheduling the same work.
2090          */
2091         if (test_bit(SCAN_COMPLETED, &local->scanning)) {
2092                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
2093                 flush_delayed_work(&local->scan_work);
2094         }
2095
2096         if (local->open_count && !reconfig_due_to_wowlan)
2097                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_SUSPEND);
2098
2099         list_for_each_entry(sdata, &local->interfaces, list) {
2100                 if (!ieee80211_sdata_running(sdata))
2101                         continue;
2102                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2103                         ieee80211_sta_restart(sdata);
2104         }
2105
2106         mod_timer(&local->sta_cleanup, jiffies + 1);
2107 #else
2108         WARN_ON(1);
2109 #endif
2110
2111         return 0;
2112 }
2113
2114 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
2115 {
2116         struct ieee80211_sub_if_data *sdata;
2117         struct ieee80211_local *local;
2118         struct ieee80211_key *key;
2119
2120         if (WARN_ON(!vif))
2121                 return;
2122
2123         sdata = vif_to_sdata(vif);
2124         local = sdata->local;
2125
2126         if (WARN_ON(!local->resuming))
2127                 return;
2128
2129         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2130                 return;
2131
2132         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
2133
2134         mutex_lock(&local->key_mtx);
2135         list_for_each_entry(key, &sdata->key_list, list)
2136                 key->flags |= KEY_FLAG_TAINTED;
2137         mutex_unlock(&local->key_mtx);
2138 }
2139 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
2140
2141 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
2142 {
2143         struct ieee80211_local *local = sdata->local;
2144         struct ieee80211_chanctx_conf *chanctx_conf;
2145         struct ieee80211_chanctx *chanctx;
2146
2147         mutex_lock(&local->chanctx_mtx);
2148
2149         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2150                                         lockdep_is_held(&local->chanctx_mtx));
2151
2152         /*
2153          * This function can be called from a work, thus it may be possible
2154          * that the chanctx_conf is removed (due to a disconnection, for
2155          * example).
2156          * So nothing should be done in such case.
2157          */
2158         if (!chanctx_conf)
2159                 goto unlock;
2160
2161         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2162         ieee80211_recalc_smps_chanctx(local, chanctx);
2163  unlock:
2164         mutex_unlock(&local->chanctx_mtx);
2165 }
2166
2167 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
2168 {
2169         struct ieee80211_local *local = sdata->local;
2170         struct ieee80211_chanctx_conf *chanctx_conf;
2171         struct ieee80211_chanctx *chanctx;
2172
2173         mutex_lock(&local->chanctx_mtx);
2174
2175         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2176                                         lockdep_is_held(&local->chanctx_mtx));
2177
2178         if (WARN_ON_ONCE(!chanctx_conf))
2179                 goto unlock;
2180
2181         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2182         ieee80211_recalc_chanctx_min_def(local, chanctx);
2183  unlock:
2184         mutex_unlock(&local->chanctx_mtx);
2185 }
2186
2187 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
2188 {
2189         size_t pos = offset;
2190
2191         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
2192                 pos += 2 + ies[pos + 1];
2193
2194         return pos;
2195 }
2196
2197 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
2198                                             int rssi_min_thold,
2199                                             int rssi_max_thold)
2200 {
2201         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
2202
2203         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2204                 return;
2205
2206         /*
2207          * Scale up threshold values before storing it, as the RSSI averaging
2208          * algorithm uses a scaled up value as well. Change this scaling
2209          * factor if the RSSI averaging algorithm changes.
2210          */
2211         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
2212         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
2213 }
2214
2215 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
2216                                     int rssi_min_thold,
2217                                     int rssi_max_thold)
2218 {
2219         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2220
2221         WARN_ON(rssi_min_thold == rssi_max_thold ||
2222                 rssi_min_thold > rssi_max_thold);
2223
2224         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2225                                        rssi_max_thold);
2226 }
2227 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2228
2229 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2230 {
2231         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2232
2233         _ieee80211_enable_rssi_reports(sdata, 0, 0);
2234 }
2235 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2236
2237 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2238                               u16 cap)
2239 {
2240         __le16 tmp;
2241
2242         *pos++ = WLAN_EID_HT_CAPABILITY;
2243         *pos++ = sizeof(struct ieee80211_ht_cap);
2244         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2245
2246         /* capability flags */
2247         tmp = cpu_to_le16(cap);
2248         memcpy(pos, &tmp, sizeof(u16));
2249         pos += sizeof(u16);
2250
2251         /* AMPDU parameters */
2252         *pos++ = ht_cap->ampdu_factor |
2253                  (ht_cap->ampdu_density <<
2254                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2255
2256         /* MCS set */
2257         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2258         pos += sizeof(ht_cap->mcs);
2259
2260         /* extended capabilities */
2261         pos += sizeof(__le16);
2262
2263         /* BF capabilities */
2264         pos += sizeof(__le32);
2265
2266         /* antenna selection */
2267         pos += sizeof(u8);
2268
2269         return pos;
2270 }
2271
2272 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2273                                u32 cap)
2274 {
2275         __le32 tmp;
2276
2277         *pos++ = WLAN_EID_VHT_CAPABILITY;
2278         *pos++ = sizeof(struct ieee80211_vht_cap);
2279         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2280
2281         /* capability flags */
2282         tmp = cpu_to_le32(cap);
2283         memcpy(pos, &tmp, sizeof(u32));
2284         pos += sizeof(u32);
2285
2286         /* VHT MCS set */
2287         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2288         pos += sizeof(vht_cap->vht_mcs);
2289
2290         return pos;
2291 }
2292
2293 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2294                                const struct cfg80211_chan_def *chandef,
2295                                u16 prot_mode, bool rifs_mode)
2296 {
2297         struct ieee80211_ht_operation *ht_oper;
2298         /* Build HT Information */
2299         *pos++ = WLAN_EID_HT_OPERATION;
2300         *pos++ = sizeof(struct ieee80211_ht_operation);
2301         ht_oper = (struct ieee80211_ht_operation *)pos;
2302         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2303                                         chandef->chan->center_freq);
2304         switch (chandef->width) {
2305         case NL80211_CHAN_WIDTH_160:
2306         case NL80211_CHAN_WIDTH_80P80:
2307         case NL80211_CHAN_WIDTH_80:
2308         case NL80211_CHAN_WIDTH_40:
2309                 if (chandef->center_freq1 > chandef->chan->center_freq)
2310                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2311                 else
2312                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2313                 break;
2314         default:
2315                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2316                 break;
2317         }
2318         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2319             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2320             chandef->width != NL80211_CHAN_WIDTH_20)
2321                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2322
2323         if (rifs_mode)
2324                 ht_oper->ht_param |= IEEE80211_HT_PARAM_RIFS_MODE;
2325
2326         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2327         ht_oper->stbc_param = 0x0000;
2328
2329         /* It seems that Basic MCS set and Supported MCS set
2330            are identical for the first 10 bytes */
2331         memset(&ht_oper->basic_set, 0, 16);
2332         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2333
2334         return pos + sizeof(struct ieee80211_ht_operation);
2335 }
2336
2337 u8 *ieee80211_ie_build_vht_oper(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2338                                 const struct cfg80211_chan_def *chandef)
2339 {
2340         struct ieee80211_vht_operation *vht_oper;
2341
2342         *pos++ = WLAN_EID_VHT_OPERATION;
2343         *pos++ = sizeof(struct ieee80211_vht_operation);
2344         vht_oper = (struct ieee80211_vht_operation *)pos;
2345         vht_oper->center_freq_seg1_idx = ieee80211_frequency_to_channel(
2346                                                         chandef->center_freq1);
2347         if (chandef->center_freq2)
2348                 vht_oper->center_freq_seg2_idx =
2349                         ieee80211_frequency_to_channel(chandef->center_freq2);
2350         else
2351                 vht_oper->center_freq_seg2_idx = 0x00;
2352
2353         switch (chandef->width) {
2354         case NL80211_CHAN_WIDTH_160:
2355                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_160MHZ;
2356                 break;
2357         case NL80211_CHAN_WIDTH_80P80:
2358                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80P80MHZ;
2359                 break;
2360         case NL80211_CHAN_WIDTH_80:
2361                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2362                 break;
2363         default:
2364                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
2365                 break;
2366         }
2367
2368         /* don't require special VHT peer rates */
2369         vht_oper->basic_mcs_set = cpu_to_le16(0xffff);
2370
2371         return pos + sizeof(struct ieee80211_vht_operation);
2372 }
2373
2374 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2375                                   const struct ieee80211_ht_operation *ht_oper,
2376                                   struct cfg80211_chan_def *chandef)
2377 {
2378         enum nl80211_channel_type channel_type;
2379
2380         if (!ht_oper) {
2381                 cfg80211_chandef_create(chandef, control_chan,
2382                                         NL80211_CHAN_NO_HT);
2383                 return;
2384         }
2385
2386         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2387         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2388                 channel_type = NL80211_CHAN_HT20;
2389                 break;
2390         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2391                 channel_type = NL80211_CHAN_HT40PLUS;
2392                 break;
2393         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2394                 channel_type = NL80211_CHAN_HT40MINUS;
2395                 break;
2396         default:
2397                 channel_type = NL80211_CHAN_NO_HT;
2398         }
2399
2400         cfg80211_chandef_create(chandef, control_chan, channel_type);
2401 }
2402
2403 void ieee80211_vht_oper_to_chandef(struct ieee80211_channel *control_chan,
2404                                    const struct ieee80211_vht_operation *oper,
2405                                    struct cfg80211_chan_def *chandef)
2406 {
2407         if (!oper)
2408                 return;
2409
2410         chandef->chan = control_chan;
2411
2412         switch (oper->chan_width) {
2413         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2414                 break;
2415         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2416                 chandef->width = NL80211_CHAN_WIDTH_80;
2417                 break;
2418         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2419                 chandef->width = NL80211_CHAN_WIDTH_160;
2420                 break;
2421         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2422                 chandef->width = NL80211_CHAN_WIDTH_80P80;
2423                 break;
2424         default:
2425                 break;
2426         }
2427
2428         chandef->center_freq1 =
2429                 ieee80211_channel_to_frequency(oper->center_freq_seg1_idx,
2430                                                control_chan->band);
2431         chandef->center_freq2 =
2432                 ieee80211_channel_to_frequency(oper->center_freq_seg2_idx,
2433                                                control_chan->band);
2434 }
2435
2436 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2437                              const struct ieee80211_supported_band *sband,
2438                              const u8 *srates, int srates_len, u32 *rates)
2439 {
2440         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2441         int shift = ieee80211_chandef_get_shift(chandef);
2442         struct ieee80211_rate *br;
2443         int brate, rate, i, j, count = 0;
2444
2445         *rates = 0;
2446
2447         for (i = 0; i < srates_len; i++) {
2448                 rate = srates[i] & 0x7f;
2449
2450                 for (j = 0; j < sband->n_bitrates; j++) {
2451                         br = &sband->bitrates[j];
2452                         if ((rate_flags & br->flags) != rate_flags)
2453                                 continue;
2454
2455                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2456                         if (brate == rate) {
2457                                 *rates |= BIT(j);
2458                                 count++;
2459                                 break;
2460                         }
2461                 }
2462         }
2463         return count;
2464 }
2465
2466 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2467                             struct sk_buff *skb, bool need_basic,
2468                             enum ieee80211_band band)
2469 {
2470         struct ieee80211_local *local = sdata->local;
2471         struct ieee80211_supported_band *sband;
2472         int rate, shift;
2473         u8 i, rates, *pos;
2474         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2475         u32 rate_flags;
2476
2477         shift = ieee80211_vif_get_shift(&sdata->vif);
2478         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2479         sband = local->hw.wiphy->bands[band];
2480         rates = 0;
2481         for (i = 0; i < sband->n_bitrates; i++) {
2482                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2483                         continue;
2484                 rates++;
2485         }
2486         if (rates > 8)
2487                 rates = 8;
2488
2489         if (skb_tailroom(skb) < rates + 2)
2490                 return -ENOMEM;
2491
2492         pos = skb_put(skb, rates + 2);
2493         *pos++ = WLAN_EID_SUPP_RATES;
2494         *pos++ = rates;
2495         for (i = 0; i < rates; i++) {
2496                 u8 basic = 0;
2497                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2498                         continue;
2499
2500                 if (need_basic && basic_rates & BIT(i))
2501                         basic = 0x80;
2502                 rate = sband->bitrates[i].bitrate;
2503                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2504                                     5 * (1 << shift));
2505                 *pos++ = basic | (u8) rate;
2506         }
2507
2508         return 0;
2509 }
2510
2511 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2512                                 struct sk_buff *skb, bool need_basic,
2513                                 enum ieee80211_band band)
2514 {
2515         struct ieee80211_local *local = sdata->local;
2516         struct ieee80211_supported_band *sband;
2517         int rate, shift;
2518         u8 i, exrates, *pos;
2519         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2520         u32 rate_flags;
2521
2522         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2523         shift = ieee80211_vif_get_shift(&sdata->vif);
2524
2525         sband = local->hw.wiphy->bands[band];
2526         exrates = 0;
2527         for (i = 0; i < sband->n_bitrates; i++) {
2528                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2529                         continue;
2530                 exrates++;
2531         }
2532
2533         if (exrates > 8)
2534                 exrates -= 8;
2535         else
2536                 exrates = 0;
2537
2538         if (skb_tailroom(skb) < exrates + 2)
2539                 return -ENOMEM;
2540
2541         if (exrates) {
2542                 pos = skb_put(skb, exrates + 2);
2543                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2544                 *pos++ = exrates;
2545                 for (i = 8; i < sband->n_bitrates; i++) {
2546                         u8 basic = 0;
2547                         if ((rate_flags & sband->bitrates[i].flags)
2548                             != rate_flags)
2549                                 continue;
2550                         if (need_basic && basic_rates & BIT(i))
2551                                 basic = 0x80;
2552                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2553                                             5 * (1 << shift));
2554                         *pos++ = basic | (u8) rate;
2555                 }
2556         }
2557         return 0;
2558 }
2559
2560 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2561 {
2562         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2563         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2564
2565         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2566                 /* non-managed type inferfaces */
2567                 return 0;
2568         }
2569         return -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
2570 }
2571 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2572
2573 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2574 {
2575         if (!mcs)
2576                 return 1;
2577
2578         /* TODO: consider rx_highest */
2579
2580         if (mcs->rx_mask[3])
2581                 return 4;
2582         if (mcs->rx_mask[2])
2583                 return 3;
2584         if (mcs->rx_mask[1])
2585                 return 2;
2586         return 1;
2587 }
2588
2589 /**
2590  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2591  * @local: mac80211 hw info struct
2592  * @status: RX status
2593  * @mpdu_len: total MPDU length (including FCS)
2594  * @mpdu_offset: offset into MPDU to calculate timestamp at
2595  *
2596  * This function calculates the RX timestamp at the given MPDU offset, taking
2597  * into account what the RX timestamp was. An offset of 0 will just normalize
2598  * the timestamp to TSF at beginning of MPDU reception.
2599  */
2600 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2601                                      struct ieee80211_rx_status *status,
2602                                      unsigned int mpdu_len,
2603                                      unsigned int mpdu_offset)
2604 {
2605         u64 ts = status->mactime;
2606         struct rate_info ri;
2607         u16 rate;
2608
2609         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2610                 return 0;
2611
2612         memset(&ri, 0, sizeof(ri));
2613
2614         /* Fill cfg80211 rate info */
2615         if (status->flag & RX_FLAG_HT) {
2616                 ri.mcs = status->rate_idx;
2617                 ri.flags |= RATE_INFO_FLAGS_MCS;
2618                 if (status->flag & RX_FLAG_40MHZ)
2619                         ri.bw = RATE_INFO_BW_40;
2620                 else
2621                         ri.bw = RATE_INFO_BW_20;
2622                 if (status->flag & RX_FLAG_SHORT_GI)
2623                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2624         } else if (status->flag & RX_FLAG_VHT) {
2625                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2626                 ri.mcs = status->rate_idx;
2627                 ri.nss = status->vht_nss;
2628                 if (status->flag & RX_FLAG_40MHZ)
2629                         ri.bw = RATE_INFO_BW_40;
2630                 else if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2631                         ri.bw = RATE_INFO_BW_80;
2632                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2633                         ri.bw = RATE_INFO_BW_160;
2634                 else
2635                         ri.bw = RATE_INFO_BW_20;
2636                 if (status->flag & RX_FLAG_SHORT_GI)
2637                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2638         } else {
2639                 struct ieee80211_supported_band *sband;
2640                 int shift = 0;
2641                 int bitrate;
2642
2643                 if (status->flag & RX_FLAG_10MHZ) {
2644                         shift = 1;
2645                         ri.bw = RATE_INFO_BW_10;
2646                 } else if (status->flag & RX_FLAG_5MHZ) {
2647                         shift = 2;
2648                         ri.bw = RATE_INFO_BW_5;
2649                 } else {
2650                         ri.bw = RATE_INFO_BW_20;
2651                 }
2652
2653                 sband = local->hw.wiphy->bands[status->band];
2654                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2655                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2656         }
2657
2658         rate = cfg80211_calculate_bitrate(&ri);
2659         if (WARN_ONCE(!rate,
2660                       "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2661                       status->flag, status->rate_idx, status->vht_nss))
2662                 return 0;
2663
2664         /* rewind from end of MPDU */
2665         if (status->flag & RX_FLAG_MACTIME_END)
2666                 ts -= mpdu_len * 8 * 10 / rate;
2667
2668         ts += mpdu_offset * 8 * 10 / rate;
2669
2670         return ts;
2671 }
2672
2673 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2674 {
2675         struct ieee80211_sub_if_data *sdata;
2676         struct cfg80211_chan_def chandef;
2677
2678         mutex_lock(&local->mtx);
2679         mutex_lock(&local->iflist_mtx);
2680         list_for_each_entry(sdata, &local->interfaces, list) {
2681                 /* it might be waiting for the local->mtx, but then
2682                  * by the time it gets it, sdata->wdev.cac_started
2683                  * will no longer be true
2684                  */
2685                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2686
2687                 if (sdata->wdev.cac_started) {
2688                         chandef = sdata->vif.bss_conf.chandef;
2689                         ieee80211_vif_release_channel(sdata);
2690                         cfg80211_cac_event(sdata->dev,
2691                                            &chandef,
2692                                            NL80211_RADAR_CAC_ABORTED,
2693                                            GFP_KERNEL);
2694                 }
2695         }
2696         mutex_unlock(&local->iflist_mtx);
2697         mutex_unlock(&local->mtx);
2698 }
2699
2700 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2701 {
2702         struct ieee80211_local *local =
2703                 container_of(work, struct ieee80211_local, radar_detected_work);
2704         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2705         struct ieee80211_chanctx *ctx;
2706         int num_chanctx = 0;
2707
2708         mutex_lock(&local->chanctx_mtx);
2709         list_for_each_entry(ctx, &local->chanctx_list, list) {
2710                 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
2711                         continue;
2712
2713                 num_chanctx++;
2714                 chandef = ctx->conf.def;
2715         }
2716         mutex_unlock(&local->chanctx_mtx);
2717
2718         ieee80211_dfs_cac_cancel(local);
2719
2720         if (num_chanctx > 1)
2721                 /* XXX: multi-channel is not supported yet */
2722                 WARN_ON(1);
2723         else
2724                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2725 }
2726
2727 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2728 {
2729         struct ieee80211_local *local = hw_to_local(hw);
2730
2731         trace_api_radar_detected(local);
2732
2733         ieee80211_queue_work(hw, &local->radar_detected_work);
2734 }
2735 EXPORT_SYMBOL(ieee80211_radar_detected);
2736
2737 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2738 {
2739         u32 ret;
2740         int tmp;
2741
2742         switch (c->width) {
2743         case NL80211_CHAN_WIDTH_20:
2744                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2745                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2746                 break;
2747         case NL80211_CHAN_WIDTH_40:
2748                 c->width = NL80211_CHAN_WIDTH_20;
2749                 c->center_freq1 = c->chan->center_freq;
2750                 ret = IEEE80211_STA_DISABLE_40MHZ |
2751                       IEEE80211_STA_DISABLE_VHT;
2752                 break;
2753         case NL80211_CHAN_WIDTH_80:
2754                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2755                 /* n_P40 */
2756                 tmp /= 2;
2757                 /* freq_P40 */
2758                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2759                 c->width = NL80211_CHAN_WIDTH_40;
2760                 ret = IEEE80211_STA_DISABLE_VHT;
2761                 break;
2762         case NL80211_CHAN_WIDTH_80P80:
2763                 c->center_freq2 = 0;
2764                 c->width = NL80211_CHAN_WIDTH_80;
2765                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2766                       IEEE80211_STA_DISABLE_160MHZ;
2767                 break;
2768         case NL80211_CHAN_WIDTH_160:
2769                 /* n_P20 */
2770                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2771                 /* n_P80 */
2772                 tmp /= 4;
2773                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2774                 c->width = NL80211_CHAN_WIDTH_80;
2775                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2776                       IEEE80211_STA_DISABLE_160MHZ;
2777                 break;
2778         default:
2779         case NL80211_CHAN_WIDTH_20_NOHT:
2780                 WARN_ON_ONCE(1);
2781                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2782                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2783                 break;
2784         case NL80211_CHAN_WIDTH_5:
2785         case NL80211_CHAN_WIDTH_10:
2786                 WARN_ON_ONCE(1);
2787                 /* keep c->width */
2788                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2789                 break;
2790         }
2791
2792         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2793
2794         return ret;
2795 }
2796
2797 /*
2798  * Returns true if smps_mode_new is strictly more restrictive than
2799  * smps_mode_old.
2800  */
2801 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2802                                    enum ieee80211_smps_mode smps_mode_new)
2803 {
2804         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2805                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2806                 return false;
2807
2808         switch (smps_mode_old) {
2809         case IEEE80211_SMPS_STATIC:
2810                 return false;
2811         case IEEE80211_SMPS_DYNAMIC:
2812                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2813         case IEEE80211_SMPS_OFF:
2814                 return smps_mode_new != IEEE80211_SMPS_OFF;
2815         default:
2816                 WARN_ON(1);
2817         }
2818
2819         return false;
2820 }
2821
2822 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2823                               struct cfg80211_csa_settings *csa_settings)
2824 {
2825         struct sk_buff *skb;
2826         struct ieee80211_mgmt *mgmt;
2827         struct ieee80211_local *local = sdata->local;
2828         int freq;
2829         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2830                                sizeof(mgmt->u.action.u.chan_switch);
2831         u8 *pos;
2832
2833         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2834             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2835                 return -EOPNOTSUPP;
2836
2837         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2838                             5 + /* channel switch announcement element */
2839                             3 + /* secondary channel offset element */
2840                             8); /* mesh channel switch parameters element */
2841         if (!skb)
2842                 return -ENOMEM;
2843
2844         skb_reserve(skb, local->tx_headroom);
2845         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2846         memset(mgmt, 0, hdr_len);
2847         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2848                                           IEEE80211_STYPE_ACTION);
2849
2850         eth_broadcast_addr(mgmt->da);
2851         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2852         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2853                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2854         } else {
2855                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2856                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2857         }
2858         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2859         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2860         pos = skb_put(skb, 5);
2861         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
2862         *pos++ = 3;                                             /* IE length */
2863         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
2864         freq = csa_settings->chandef.chan->center_freq;
2865         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
2866         *pos++ = csa_settings->count;                           /* count */
2867
2868         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2869                 enum nl80211_channel_type ch_type;
2870
2871                 skb_put(skb, 3);
2872                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
2873                 *pos++ = 1;                                     /* IE length */
2874                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2875                 if (ch_type == NL80211_CHAN_HT40PLUS)
2876                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2877                 else
2878                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2879         }
2880
2881         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2882                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2883
2884                 skb_put(skb, 8);
2885                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
2886                 *pos++ = 6;                                     /* IE length */
2887                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
2888                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
2889                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2890                 *pos++ |= csa_settings->block_tx ?
2891                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2892                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2893                 pos += 2;
2894                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2895                 pos += 2;
2896         }
2897
2898         ieee80211_tx_skb(sdata, skb);
2899         return 0;
2900 }
2901
2902 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2903 {
2904         return !(cs == NULL || cs->cipher == 0 ||
2905                  cs->hdr_len < cs->pn_len + cs->pn_off ||
2906                  cs->hdr_len <= cs->key_idx_off ||
2907                  cs->key_idx_shift > 7 ||
2908                  cs->key_idx_mask == 0);
2909 }
2910
2911 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2912 {
2913         int i;
2914
2915         /* Ensure we have enough iftype bitmap space for all iftype values */
2916         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2917
2918         for (i = 0; i < n; i++)
2919                 if (!ieee80211_cs_valid(&cs[i]))
2920                         return false;
2921
2922         return true;
2923 }
2924
2925 const struct ieee80211_cipher_scheme *
2926 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2927                  enum nl80211_iftype iftype)
2928 {
2929         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2930         int n = local->hw.n_cipher_schemes;
2931         int i;
2932         const struct ieee80211_cipher_scheme *cs = NULL;
2933
2934         for (i = 0; i < n; i++) {
2935                 if (l[i].cipher == cipher) {
2936                         cs = &l[i];
2937                         break;
2938                 }
2939         }
2940
2941         if (!cs || !(cs->iftype & BIT(iftype)))
2942                 return NULL;
2943
2944         return cs;
2945 }
2946
2947 int ieee80211_cs_headroom(struct ieee80211_local *local,
2948                           struct cfg80211_crypto_settings *crypto,
2949                           enum nl80211_iftype iftype)
2950 {
2951         const struct ieee80211_cipher_scheme *cs;
2952         int headroom = IEEE80211_ENCRYPT_HEADROOM;
2953         int i;
2954
2955         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
2956                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
2957                                       iftype);
2958
2959                 if (cs && headroom < cs->hdr_len)
2960                         headroom = cs->hdr_len;
2961         }
2962
2963         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
2964         if (cs && headroom < cs->hdr_len)
2965                 headroom = cs->hdr_len;
2966
2967         return headroom;
2968 }
2969
2970 static bool
2971 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
2972 {
2973         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
2974         int skip;
2975
2976         if (end > 0)
2977                 return false;
2978
2979         /* One shot NOA  */
2980         if (data->count[i] == 1)
2981                 return false;
2982
2983         if (data->desc[i].interval == 0)
2984                 return false;
2985
2986         /* End time is in the past, check for repetitions */
2987         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
2988         if (data->count[i] < 255) {
2989                 if (data->count[i] <= skip) {
2990                         data->count[i] = 0;
2991                         return false;
2992                 }
2993
2994                 data->count[i] -= skip;
2995         }
2996
2997         data->desc[i].start += skip * data->desc[i].interval;
2998
2999         return true;
3000 }
3001
3002 static bool
3003 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
3004                              s32 *offset)
3005 {
3006         bool ret = false;
3007         int i;
3008
3009         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3010                 s32 cur;
3011
3012                 if (!data->count[i])
3013                         continue;
3014
3015                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
3016                         ret = true;
3017
3018                 cur = data->desc[i].start - tsf;
3019                 if (cur > *offset)
3020                         continue;
3021
3022                 cur = data->desc[i].start + data->desc[i].duration - tsf;
3023                 if (cur > *offset)
3024                         *offset = cur;
3025         }
3026
3027         return ret;
3028 }
3029
3030 static u32
3031 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
3032 {
3033         s32 offset = 0;
3034         int tries = 0;
3035         /*
3036          * arbitrary limit, used to avoid infinite loops when combined NoA
3037          * descriptors cover the full time period.
3038          */
3039         int max_tries = 5;
3040
3041         ieee80211_extend_absent_time(data, tsf, &offset);
3042         do {
3043                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
3044                         break;
3045
3046                 tries++;
3047         } while (tries < max_tries);
3048
3049         return offset;
3050 }
3051
3052 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
3053 {
3054         u32 next_offset = BIT(31) - 1;
3055         int i;
3056
3057         data->absent = 0;
3058         data->has_next_tsf = false;
3059         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3060                 s32 start;
3061
3062                 if (!data->count[i])
3063                         continue;
3064
3065                 ieee80211_extend_noa_desc(data, tsf, i);
3066                 start = data->desc[i].start - tsf;
3067                 if (start <= 0)
3068                         data->absent |= BIT(i);
3069
3070                 if (next_offset > start)
3071                         next_offset = start;
3072
3073                 data->has_next_tsf = true;
3074         }
3075
3076         if (data->absent)
3077                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
3078
3079         data->next_tsf = tsf + next_offset;
3080 }
3081 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
3082
3083 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
3084                             struct ieee80211_noa_data *data, u32 tsf)
3085 {
3086         int ret = 0;
3087         int i;
3088
3089         memset(data, 0, sizeof(*data));
3090
3091         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3092                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
3093
3094                 if (!desc->count || !desc->duration)
3095                         continue;
3096
3097                 data->count[i] = desc->count;
3098                 data->desc[i].start = le32_to_cpu(desc->start_time);
3099                 data->desc[i].duration = le32_to_cpu(desc->duration);
3100                 data->desc[i].interval = le32_to_cpu(desc->interval);
3101
3102                 if (data->count[i] > 1 &&
3103                     data->desc[i].interval < data->desc[i].duration)
3104                         continue;
3105
3106                 ieee80211_extend_noa_desc(data, tsf, i);
3107                 ret++;
3108         }
3109
3110         if (ret)
3111                 ieee80211_update_p2p_noa(data, tsf);
3112
3113         return ret;
3114 }
3115 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
3116
3117 void ieee80211_recalc_dtim(struct ieee80211_local *local,
3118                            struct ieee80211_sub_if_data *sdata)
3119 {
3120         u64 tsf = drv_get_tsf(local, sdata);
3121         u64 dtim_count = 0;
3122         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
3123         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
3124         struct ps_data *ps;
3125         u8 bcns_from_dtim;
3126
3127         if (tsf == -1ULL || !beacon_int || !dtim_period)
3128                 return;
3129
3130         if (sdata->vif.type == NL80211_IFTYPE_AP ||
3131             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
3132                 if (!sdata->bss)
3133                         return;
3134
3135                 ps = &sdata->bss->ps;
3136         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3137                 ps = &sdata->u.mesh.ps;
3138         } else {
3139                 return;
3140         }
3141
3142         /*
3143          * actually finds last dtim_count, mac80211 will update in
3144          * __beacon_add_tim().
3145          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
3146          */
3147         do_div(tsf, beacon_int);
3148         bcns_from_dtim = do_div(tsf, dtim_period);
3149         /* just had a DTIM */
3150         if (!bcns_from_dtim)
3151                 dtim_count = 0;
3152         else
3153                 dtim_count = dtim_period - bcns_from_dtim;
3154
3155         ps->dtim_count = dtim_count;
3156 }
3157
3158 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
3159                                          struct ieee80211_chanctx *ctx)
3160 {
3161         struct ieee80211_sub_if_data *sdata;
3162         u8 radar_detect = 0;
3163
3164         lockdep_assert_held(&local->chanctx_mtx);
3165
3166         if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
3167                 return 0;
3168
3169         list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
3170                 if (sdata->reserved_radar_required)
3171                         radar_detect |= BIT(sdata->reserved_chandef.width);
3172
3173         /*
3174          * An in-place reservation context should not have any assigned vifs
3175          * until it replaces the other context.
3176          */
3177         WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
3178                 !list_empty(&ctx->assigned_vifs));
3179
3180         list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
3181                 if (sdata->radar_required)
3182                         radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
3183
3184         return radar_detect;
3185 }
3186
3187 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
3188                                  const struct cfg80211_chan_def *chandef,
3189                                  enum ieee80211_chanctx_mode chanmode,
3190                                  u8 radar_detect)
3191 {
3192         struct ieee80211_local *local = sdata->local;
3193         struct ieee80211_sub_if_data *sdata_iter;
3194         enum nl80211_iftype iftype = sdata->wdev.iftype;
3195         int num[NUM_NL80211_IFTYPES];
3196         struct ieee80211_chanctx *ctx;
3197         int num_different_channels = 0;
3198         int total = 1;
3199
3200         lockdep_assert_held(&local->chanctx_mtx);
3201
3202         if (WARN_ON(hweight32(radar_detect) > 1))
3203                 return -EINVAL;
3204
3205         if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3206                     !chandef->chan))
3207                 return -EINVAL;
3208
3209         if (chandef)
3210                 num_different_channels = 1;
3211
3212         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
3213                 return -EINVAL;
3214
3215         /* Always allow software iftypes */
3216         if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
3217                 if (radar_detect)
3218                         return -EINVAL;
3219                 return 0;
3220         }
3221
3222         memset(num, 0, sizeof(num));
3223
3224         if (iftype != NL80211_IFTYPE_UNSPECIFIED)
3225                 num[iftype] = 1;
3226
3227         list_for_each_entry(ctx, &local->chanctx_list, list) {
3228                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3229                         continue;
3230                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3231                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
3232                         num_different_channels++;
3233                         continue;
3234                 }
3235                 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3236                     cfg80211_chandef_compatible(chandef,
3237                                                 &ctx->conf.def))
3238                         continue;
3239                 num_different_channels++;
3240         }
3241
3242         list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
3243                 struct wireless_dev *wdev_iter;
3244
3245                 wdev_iter = &sdata_iter->wdev;
3246
3247                 if (sdata_iter == sdata ||
3248                     !ieee80211_sdata_running(sdata_iter) ||
3249                     local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
3250                         continue;
3251
3252                 num[wdev_iter->iftype]++;
3253                 total++;
3254         }
3255
3256         if (total == 1 && !radar_detect)
3257                 return 0;
3258
3259         return cfg80211_check_combinations(local->hw.wiphy,
3260                                            num_different_channels,
3261                                            radar_detect, num);
3262 }
3263
3264 static void
3265 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
3266                          void *data)
3267 {
3268         u32 *max_num_different_channels = data;
3269
3270         *max_num_different_channels = max(*max_num_different_channels,
3271                                           c->num_different_channels);
3272 }
3273
3274 int ieee80211_max_num_channels(struct ieee80211_local *local)
3275 {
3276         struct ieee80211_sub_if_data *sdata;
3277         int num[NUM_NL80211_IFTYPES] = {};
3278         struct ieee80211_chanctx *ctx;
3279         int num_different_channels = 0;
3280         u8 radar_detect = 0;
3281         u32 max_num_different_channels = 1;
3282         int err;
3283
3284         lockdep_assert_held(&local->chanctx_mtx);
3285
3286         list_for_each_entry(ctx, &local->chanctx_list, list) {
3287                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3288                         continue;
3289
3290                 num_different_channels++;
3291
3292                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3293         }
3294
3295         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3296                 num[sdata->wdev.iftype]++;
3297
3298         err = cfg80211_iter_combinations(local->hw.wiphy,
3299                                          num_different_channels, radar_detect,
3300                                          num, ieee80211_iter_max_chans,
3301                                          &max_num_different_channels);
3302         if (err < 0)
3303                 return err;
3304
3305         return max_num_different_channels;
3306 }
3307
3308 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
3309 {
3310         *buf++ = WLAN_EID_VENDOR_SPECIFIC;
3311         *buf++ = 7; /* len */
3312         *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
3313         *buf++ = 0x50;
3314         *buf++ = 0xf2;
3315         *buf++ = 2; /* WME */
3316         *buf++ = 0; /* WME info */
3317         *buf++ = 1; /* WME ver */
3318         *buf++ = qosinfo; /* U-APSD no in use */
3319
3320         return buf;
3321 }
3322
3323 void ieee80211_init_tx_queue(struct ieee80211_sub_if_data *sdata,
3324                              struct sta_info *sta,
3325                              struct txq_info *txqi, int tid)
3326 {
3327         skb_queue_head_init(&txqi->queue);
3328         txqi->txq.vif = &sdata->vif;
3329
3330         if (sta) {
3331                 txqi->txq.sta = &sta->sta;
3332                 sta->sta.txq[tid] = &txqi->txq;
3333                 txqi->txq.tid = tid;
3334                 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
3335         } else {
3336                 sdata->vif.txq = &txqi->txq;
3337                 txqi->txq.tid = 0;
3338                 txqi->txq.ac = IEEE80211_AC_BE;
3339         }
3340 }