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, bool enable_qos)
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;
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         is_ocb = (sdata->vif.type == NL80211_IFTYPE_OCB);
1134
1135         /* Set defaults according to 802.11-2007 Table 7-37 */
1136         aCWmax = 1023;
1137         if (use_11b)
1138                 aCWmin = 31;
1139         else
1140                 aCWmin = 15;
1141
1142         /* Confiure old 802.11b/g medium access rules. */
1143         qparam.cw_max = aCWmax;
1144         qparam.cw_min = aCWmin;
1145         qparam.txop = 0;
1146         qparam.aifs = 2;
1147
1148         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1149                 /* Update if QoS is enabled. */
1150                 if (enable_qos) {
1151                         switch (ac) {
1152                         case IEEE80211_AC_BK:
1153                                 qparam.cw_max = aCWmax;
1154                                 qparam.cw_min = aCWmin;
1155                                 qparam.txop = 0;
1156                                 if (is_ocb)
1157                                         qparam.aifs = 9;
1158                                 else
1159                                         qparam.aifs = 7;
1160                                 break;
1161                         /* never happens but let's not leave undefined */
1162                         default:
1163                         case IEEE80211_AC_BE:
1164                                 qparam.cw_max = aCWmax;
1165                                 qparam.cw_min = aCWmin;
1166                                 qparam.txop = 0;
1167                                 if (is_ocb)
1168                                         qparam.aifs = 6;
1169                                 else
1170                                         qparam.aifs = 3;
1171                                 break;
1172                         case IEEE80211_AC_VI:
1173                                 qparam.cw_max = aCWmin;
1174                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1175                                 if (is_ocb)
1176                                         qparam.txop = 0;
1177                                 else if (use_11b)
1178                                         qparam.txop = 6016/32;
1179                                 else
1180                                         qparam.txop = 3008/32;
1181
1182                                 if (is_ocb)
1183                                         qparam.aifs = 3;
1184                                 else
1185                                         qparam.aifs = 2;
1186                                 break;
1187                         case IEEE80211_AC_VO:
1188                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1189                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1190                                 if (is_ocb)
1191                                         qparam.txop = 0;
1192                                 else if (use_11b)
1193                                         qparam.txop = 3264/32;
1194                                 else
1195                                         qparam.txop = 1504/32;
1196                                 qparam.aifs = 2;
1197                                 break;
1198                         }
1199                 }
1200
1201                 qparam.uapsd = false;
1202
1203                 sdata->tx_conf[ac] = qparam;
1204                 drv_conf_tx(local, sdata, ac, &qparam);
1205         }
1206
1207         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1208             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1209                 sdata->vif.bss_conf.qos = enable_qos;
1210                 if (bss_notify)
1211                         ieee80211_bss_info_change_notify(sdata,
1212                                                          BSS_CHANGED_QOS);
1213         }
1214 }
1215
1216 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1217                          u16 transaction, u16 auth_alg, u16 status,
1218                          const u8 *extra, size_t extra_len, const u8 *da,
1219                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1220                          u32 tx_flags)
1221 {
1222         struct ieee80211_local *local = sdata->local;
1223         struct sk_buff *skb;
1224         struct ieee80211_mgmt *mgmt;
1225         int err;
1226
1227         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1228         skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
1229                             24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
1230         if (!skb)
1231                 return;
1232
1233         skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
1234
1235         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1236         memset(mgmt, 0, 24 + 6);
1237         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1238                                           IEEE80211_STYPE_AUTH);
1239         memcpy(mgmt->da, da, ETH_ALEN);
1240         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1241         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1242         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1243         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1244         mgmt->u.auth.status_code = cpu_to_le16(status);
1245         if (extra)
1246                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1247
1248         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1249                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1250                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1251                 WARN_ON(err);
1252         }
1253
1254         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1255                                         tx_flags;
1256         ieee80211_tx_skb(sdata, skb);
1257 }
1258
1259 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1260                                     const u8 *bssid, u16 stype, u16 reason,
1261                                     bool send_frame, u8 *frame_buf)
1262 {
1263         struct ieee80211_local *local = sdata->local;
1264         struct sk_buff *skb;
1265         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1266
1267         /* build frame */
1268         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1269         mgmt->duration = 0; /* initialize only */
1270         mgmt->seq_ctrl = 0; /* initialize only */
1271         memcpy(mgmt->da, bssid, ETH_ALEN);
1272         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1273         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1274         /* u.deauth.reason_code == u.disassoc.reason_code */
1275         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1276
1277         if (send_frame) {
1278                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1279                                     IEEE80211_DEAUTH_FRAME_LEN);
1280                 if (!skb)
1281                         return;
1282
1283                 skb_reserve(skb, local->hw.extra_tx_headroom);
1284
1285                 /* copy in frame */
1286                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1287                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1288
1289                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1290                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1291                         IEEE80211_SKB_CB(skb)->flags |=
1292                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1293
1294                 ieee80211_tx_skb(sdata, skb);
1295         }
1296 }
1297
1298 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
1299                                          u8 *buffer, size_t buffer_len,
1300                                          const u8 *ie, size_t ie_len,
1301                                          enum ieee80211_band band,
1302                                          u32 rate_mask,
1303                                          struct cfg80211_chan_def *chandef,
1304                                          size_t *offset)
1305 {
1306         struct ieee80211_supported_band *sband;
1307         u8 *pos = buffer, *end = buffer + buffer_len;
1308         size_t noffset;
1309         int supp_rates_len, i;
1310         u8 rates[32];
1311         int num_rates;
1312         int ext_rates_len;
1313         int shift;
1314         u32 rate_flags;
1315         bool have_80mhz = false;
1316
1317         *offset = 0;
1318
1319         sband = local->hw.wiphy->bands[band];
1320         if (WARN_ON_ONCE(!sband))
1321                 return 0;
1322
1323         rate_flags = ieee80211_chandef_rate_flags(chandef);
1324         shift = ieee80211_chandef_get_shift(chandef);
1325
1326         num_rates = 0;
1327         for (i = 0; i < sband->n_bitrates; i++) {
1328                 if ((BIT(i) & rate_mask) == 0)
1329                         continue; /* skip rate */
1330                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1331                         continue;
1332
1333                 rates[num_rates++] =
1334                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1335                                           (1 << shift) * 5);
1336         }
1337
1338         supp_rates_len = min_t(int, num_rates, 8);
1339
1340         if (end - pos < 2 + supp_rates_len)
1341                 goto out_err;
1342         *pos++ = WLAN_EID_SUPP_RATES;
1343         *pos++ = supp_rates_len;
1344         memcpy(pos, rates, supp_rates_len);
1345         pos += supp_rates_len;
1346
1347         /* insert "request information" if in custom IEs */
1348         if (ie && ie_len) {
1349                 static const u8 before_extrates[] = {
1350                         WLAN_EID_SSID,
1351                         WLAN_EID_SUPP_RATES,
1352                         WLAN_EID_REQUEST,
1353                 };
1354                 noffset = ieee80211_ie_split(ie, ie_len,
1355                                              before_extrates,
1356                                              ARRAY_SIZE(before_extrates),
1357                                              *offset);
1358                 if (end - pos < noffset - *offset)
1359                         goto out_err;
1360                 memcpy(pos, ie + *offset, noffset - *offset);
1361                 pos += noffset - *offset;
1362                 *offset = noffset;
1363         }
1364
1365         ext_rates_len = num_rates - supp_rates_len;
1366         if (ext_rates_len > 0) {
1367                 if (end - pos < 2 + ext_rates_len)
1368                         goto out_err;
1369                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1370                 *pos++ = ext_rates_len;
1371                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1372                 pos += ext_rates_len;
1373         }
1374
1375         if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1376                 if (end - pos < 3)
1377                         goto out_err;
1378                 *pos++ = WLAN_EID_DS_PARAMS;
1379                 *pos++ = 1;
1380                 *pos++ = ieee80211_frequency_to_channel(
1381                                 chandef->chan->center_freq);
1382         }
1383
1384         /* insert custom IEs that go before HT */
1385         if (ie && ie_len) {
1386                 static const u8 before_ht[] = {
1387                         WLAN_EID_SSID,
1388                         WLAN_EID_SUPP_RATES,
1389                         WLAN_EID_REQUEST,
1390                         WLAN_EID_EXT_SUPP_RATES,
1391                         WLAN_EID_DS_PARAMS,
1392                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1393                 };
1394                 noffset = ieee80211_ie_split(ie, ie_len,
1395                                              before_ht, ARRAY_SIZE(before_ht),
1396                                              *offset);
1397                 if (end - pos < noffset - *offset)
1398                         goto out_err;
1399                 memcpy(pos, ie + *offset, noffset - *offset);
1400                 pos += noffset - *offset;
1401                 *offset = noffset;
1402         }
1403
1404         if (sband->ht_cap.ht_supported) {
1405                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1406                         goto out_err;
1407                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1408                                                 sband->ht_cap.cap);
1409         }
1410
1411         /*
1412          * If adding more here, adjust code in main.c
1413          * that calculates local->scan_ies_len.
1414          */
1415
1416         /* insert custom IEs that go before VHT */
1417         if (ie && ie_len) {
1418                 static const u8 before_vht[] = {
1419                         WLAN_EID_SSID,
1420                         WLAN_EID_SUPP_RATES,
1421                         WLAN_EID_REQUEST,
1422                         WLAN_EID_EXT_SUPP_RATES,
1423                         WLAN_EID_DS_PARAMS,
1424                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1425                         WLAN_EID_HT_CAPABILITY,
1426                         WLAN_EID_BSS_COEX_2040,
1427                         WLAN_EID_EXT_CAPABILITY,
1428                         WLAN_EID_SSID_LIST,
1429                         WLAN_EID_CHANNEL_USAGE,
1430                         WLAN_EID_INTERWORKING,
1431                         /* mesh ID can't happen here */
1432                         /* 60 GHz can't happen here right now */
1433                 };
1434                 noffset = ieee80211_ie_split(ie, ie_len,
1435                                              before_vht, ARRAY_SIZE(before_vht),
1436                                              *offset);
1437                 if (end - pos < noffset - *offset)
1438                         goto out_err;
1439                 memcpy(pos, ie + *offset, noffset - *offset);
1440                 pos += noffset - *offset;
1441                 *offset = noffset;
1442         }
1443
1444         /* Check if any channel in this sband supports at least 80 MHz */
1445         for (i = 0; i < sband->n_channels; i++) {
1446                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
1447                                                 IEEE80211_CHAN_NO_80MHZ))
1448                         continue;
1449
1450                 have_80mhz = true;
1451                 break;
1452         }
1453
1454         if (sband->vht_cap.vht_supported && have_80mhz) {
1455                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1456                         goto out_err;
1457                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1458                                                  sband->vht_cap.cap);
1459         }
1460
1461         return pos - buffer;
1462  out_err:
1463         WARN_ONCE(1, "not enough space for preq IEs\n");
1464         return pos - buffer;
1465 }
1466
1467 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1468                              size_t buffer_len,
1469                              struct ieee80211_scan_ies *ie_desc,
1470                              const u8 *ie, size_t ie_len,
1471                              u8 bands_used, u32 *rate_masks,
1472                              struct cfg80211_chan_def *chandef)
1473 {
1474         size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
1475         int i;
1476
1477         memset(ie_desc, 0, sizeof(*ie_desc));
1478
1479         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1480                 if (bands_used & BIT(i)) {
1481                         pos += ieee80211_build_preq_ies_band(local,
1482                                                              buffer + pos,
1483                                                              buffer_len - pos,
1484                                                              ie, ie_len, i,
1485                                                              rate_masks[i],
1486                                                              chandef,
1487                                                              &custom_ie_offset);
1488                         ie_desc->ies[i] = buffer + old_pos;
1489                         ie_desc->len[i] = pos - old_pos;
1490                         old_pos = pos;
1491                 }
1492         }
1493
1494         /* add any remaining custom IEs */
1495         if (ie && ie_len) {
1496                 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
1497                               "not enough space for preq custom IEs\n"))
1498                         return pos;
1499                 memcpy(buffer + pos, ie + custom_ie_offset,
1500                        ie_len - custom_ie_offset);
1501                 ie_desc->common_ies = buffer + pos;
1502                 ie_desc->common_ie_len = ie_len - custom_ie_offset;
1503                 pos += ie_len - custom_ie_offset;
1504         }
1505
1506         return pos;
1507 };
1508
1509 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1510                                           const u8 *src, const u8 *dst,
1511                                           u32 ratemask,
1512                                           struct ieee80211_channel *chan,
1513                                           const u8 *ssid, size_t ssid_len,
1514                                           const u8 *ie, size_t ie_len,
1515                                           bool directed)
1516 {
1517         struct ieee80211_local *local = sdata->local;
1518         struct cfg80211_chan_def chandef;
1519         struct sk_buff *skb;
1520         struct ieee80211_mgmt *mgmt;
1521         int ies_len;
1522         u32 rate_masks[IEEE80211_NUM_BANDS] = {};
1523         struct ieee80211_scan_ies dummy_ie_desc;
1524
1525         /*
1526          * Do not send DS Channel parameter for directed probe requests
1527          * in order to maximize the chance that we get a response.  Some
1528          * badly-behaved APs don't respond when this parameter is included.
1529          */
1530         chandef.width = sdata->vif.bss_conf.chandef.width;
1531         if (directed)
1532                 chandef.chan = NULL;
1533         else
1534                 chandef.chan = chan;
1535
1536         skb = ieee80211_probereq_get(&local->hw, src, ssid, ssid_len,
1537                                      100 + ie_len);
1538         if (!skb)
1539                 return NULL;
1540
1541         rate_masks[chan->band] = ratemask;
1542         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1543                                            skb_tailroom(skb), &dummy_ie_desc,
1544                                            ie, ie_len, BIT(chan->band),
1545                                            rate_masks, &chandef);
1546         skb_put(skb, ies_len);
1547
1548         if (dst) {
1549                 mgmt = (struct ieee80211_mgmt *) skb->data;
1550                 memcpy(mgmt->da, dst, ETH_ALEN);
1551                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1552         }
1553
1554         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1555
1556         return skb;
1557 }
1558
1559 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata,
1560                               const u8 *src, const u8 *dst,
1561                               const u8 *ssid, size_t ssid_len,
1562                               const u8 *ie, size_t ie_len,
1563                               u32 ratemask, bool directed, u32 tx_flags,
1564                               struct ieee80211_channel *channel, bool scan)
1565 {
1566         struct sk_buff *skb;
1567
1568         skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
1569                                         ssid, ssid_len,
1570                                         ie, ie_len, directed);
1571         if (skb) {
1572                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1573                 if (scan)
1574                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1575                 else
1576                         ieee80211_tx_skb(sdata, skb);
1577         }
1578 }
1579
1580 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1581                             struct ieee802_11_elems *elems,
1582                             enum ieee80211_band band, u32 *basic_rates)
1583 {
1584         struct ieee80211_supported_band *sband;
1585         size_t num_rates;
1586         u32 supp_rates, rate_flags;
1587         int i, j, shift;
1588         sband = sdata->local->hw.wiphy->bands[band];
1589
1590         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1591         shift = ieee80211_vif_get_shift(&sdata->vif);
1592
1593         if (WARN_ON(!sband))
1594                 return 1;
1595
1596         num_rates = sband->n_bitrates;
1597         supp_rates = 0;
1598         for (i = 0; i < elems->supp_rates_len +
1599                      elems->ext_supp_rates_len; i++) {
1600                 u8 rate = 0;
1601                 int own_rate;
1602                 bool is_basic;
1603                 if (i < elems->supp_rates_len)
1604                         rate = elems->supp_rates[i];
1605                 else if (elems->ext_supp_rates)
1606                         rate = elems->ext_supp_rates
1607                                 [i - elems->supp_rates_len];
1608                 own_rate = 5 * (rate & 0x7f);
1609                 is_basic = !!(rate & 0x80);
1610
1611                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1612                         continue;
1613
1614                 for (j = 0; j < num_rates; j++) {
1615                         int brate;
1616                         if ((rate_flags & sband->bitrates[j].flags)
1617                             != rate_flags)
1618                                 continue;
1619
1620                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1621                                              1 << shift);
1622
1623                         if (brate == own_rate) {
1624                                 supp_rates |= BIT(j);
1625                                 if (basic_rates && is_basic)
1626                                         *basic_rates |= BIT(j);
1627                         }
1628                 }
1629         }
1630         return supp_rates;
1631 }
1632
1633 void ieee80211_stop_device(struct ieee80211_local *local)
1634 {
1635         ieee80211_led_radio(local, false);
1636         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1637
1638         cancel_work_sync(&local->reconfig_filter);
1639
1640         flush_workqueue(local->workqueue);
1641         drv_stop(local);
1642 }
1643
1644 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1645 {
1646         struct ieee80211_sub_if_data *sdata;
1647         struct ieee80211_chanctx *ctx;
1648
1649         /*
1650          * We get here if during resume the device can't be restarted properly.
1651          * We might also get here if this happens during HW reset, which is a
1652          * slightly different situation and we need to drop all connections in
1653          * the latter case.
1654          *
1655          * Ask cfg80211 to turn off all interfaces, this will result in more
1656          * warnings but at least we'll then get into a clean stopped state.
1657          */
1658
1659         local->resuming = false;
1660         local->suspended = false;
1661         local->in_reconfig = false;
1662
1663         /* scheduled scan clearly can't be running any more, but tell
1664          * cfg80211 and clear local state
1665          */
1666         ieee80211_sched_scan_end(local);
1667
1668         list_for_each_entry(sdata, &local->interfaces, list)
1669                 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1670
1671         /* Mark channel contexts as not being in the driver any more to avoid
1672          * removing them from the driver during the shutdown process...
1673          */
1674         mutex_lock(&local->chanctx_mtx);
1675         list_for_each_entry(ctx, &local->chanctx_list, list)
1676                 ctx->driver_present = false;
1677         mutex_unlock(&local->chanctx_mtx);
1678
1679         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1680 }
1681
1682 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1683                                      struct ieee80211_sub_if_data *sdata)
1684 {
1685         struct ieee80211_chanctx_conf *conf;
1686         struct ieee80211_chanctx *ctx;
1687
1688         if (!local->use_chanctx)
1689                 return;
1690
1691         mutex_lock(&local->chanctx_mtx);
1692         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1693                                          lockdep_is_held(&local->chanctx_mtx));
1694         if (conf) {
1695                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1696                 drv_assign_vif_chanctx(local, sdata, ctx);
1697         }
1698         mutex_unlock(&local->chanctx_mtx);
1699 }
1700
1701 int ieee80211_reconfig(struct ieee80211_local *local)
1702 {
1703         struct ieee80211_hw *hw = &local->hw;
1704         struct ieee80211_sub_if_data *sdata;
1705         struct ieee80211_chanctx *ctx;
1706         struct sta_info *sta;
1707         int res, i;
1708         bool reconfig_due_to_wowlan = false;
1709         struct ieee80211_sub_if_data *sched_scan_sdata;
1710         struct cfg80211_sched_scan_request *sched_scan_req;
1711         bool sched_scan_stopped = false;
1712         bool suspended = local->suspended;
1713
1714         /* nothing to do if HW shouldn't run */
1715         if (!local->open_count)
1716                 goto wake_up;
1717
1718 #ifdef CONFIG_PM
1719         if (suspended)
1720                 local->resuming = true;
1721
1722         if (local->wowlan) {
1723                 /*
1724                  * In the wowlan case, both mac80211 and the device
1725                  * are functional when the resume op is called, so
1726                  * clear local->suspended so the device could operate
1727                  * normally (e.g. pass rx frames).
1728                  */
1729                 local->suspended = false;
1730                 res = drv_resume(local);
1731                 local->wowlan = false;
1732                 if (res < 0) {
1733                         local->resuming = false;
1734                         return res;
1735                 }
1736                 if (res == 0)
1737                         goto wake_up;
1738                 WARN_ON(res > 1);
1739                 /*
1740                  * res is 1, which means the driver requested
1741                  * to go through a regular reset on wakeup.
1742                  * restore local->suspended in this case.
1743                  */
1744                 reconfig_due_to_wowlan = true;
1745                 local->suspended = true;
1746         }
1747 #endif
1748
1749         /*
1750          * In case of hw_restart during suspend (without wowlan),
1751          * cancel restart work, as we are reconfiguring the device
1752          * anyway.
1753          * Note that restart_work is scheduled on a frozen workqueue,
1754          * so we can't deadlock in this case.
1755          */
1756         if (suspended && local->in_reconfig && !reconfig_due_to_wowlan)
1757                 cancel_work_sync(&local->restart_work);
1758
1759         local->started = false;
1760
1761         /*
1762          * Upon resume hardware can sometimes be goofy due to
1763          * various platform / driver / bus issues, so restarting
1764          * the device may at times not work immediately. Propagate
1765          * the error.
1766          */
1767         res = drv_start(local);
1768         if (res) {
1769                 if (suspended)
1770                         WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1771                 else
1772                         WARN(1, "Hardware became unavailable during restart.\n");
1773                 ieee80211_handle_reconfig_failure(local);
1774                 return res;
1775         }
1776
1777         /* setup fragmentation threshold */
1778         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1779
1780         /* setup RTS threshold */
1781         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1782
1783         /* reset coverage class */
1784         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1785
1786         ieee80211_led_radio(local, true);
1787         ieee80211_mod_tpt_led_trig(local,
1788                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1789
1790         /* add interfaces */
1791         sdata = rtnl_dereference(local->monitor_sdata);
1792         if (sdata) {
1793                 /* in HW restart it exists already */
1794                 WARN_ON(local->resuming);
1795                 res = drv_add_interface(local, sdata);
1796                 if (WARN_ON(res)) {
1797                         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1798                         synchronize_net();
1799                         kfree(sdata);
1800                 }
1801         }
1802
1803         list_for_each_entry(sdata, &local->interfaces, list) {
1804                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1805                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1806                     ieee80211_sdata_running(sdata)) {
1807                         res = drv_add_interface(local, sdata);
1808                         if (WARN_ON(res))
1809                                 break;
1810                 }
1811         }
1812
1813         /* If adding any of the interfaces failed above, roll back and
1814          * report failure.
1815          */
1816         if (res) {
1817                 list_for_each_entry_continue_reverse(sdata, &local->interfaces,
1818                                                      list)
1819                         if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1820                             sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1821                             ieee80211_sdata_running(sdata))
1822                                 drv_remove_interface(local, sdata);
1823                 ieee80211_handle_reconfig_failure(local);
1824                 return res;
1825         }
1826
1827         /* add channel contexts */
1828         if (local->use_chanctx) {
1829                 mutex_lock(&local->chanctx_mtx);
1830                 list_for_each_entry(ctx, &local->chanctx_list, list)
1831                         if (ctx->replace_state !=
1832                             IEEE80211_CHANCTX_REPLACES_OTHER)
1833                                 WARN_ON(drv_add_chanctx(local, ctx));
1834                 mutex_unlock(&local->chanctx_mtx);
1835
1836                 list_for_each_entry(sdata, &local->interfaces, list) {
1837                         if (!ieee80211_sdata_running(sdata))
1838                                 continue;
1839                         ieee80211_assign_chanctx(local, sdata);
1840                 }
1841
1842                 sdata = rtnl_dereference(local->monitor_sdata);
1843                 if (sdata && ieee80211_sdata_running(sdata))
1844                         ieee80211_assign_chanctx(local, sdata);
1845         }
1846
1847         /* add STAs back */
1848         mutex_lock(&local->sta_mtx);
1849         list_for_each_entry(sta, &local->sta_list, list) {
1850                 enum ieee80211_sta_state state;
1851
1852                 if (!sta->uploaded)
1853                         continue;
1854
1855                 /* AP-mode stations will be added later */
1856                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1857                         continue;
1858
1859                 for (state = IEEE80211_STA_NOTEXIST;
1860                      state < sta->sta_state; state++)
1861                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1862                                               state + 1));
1863         }
1864         mutex_unlock(&local->sta_mtx);
1865
1866         /* reconfigure tx conf */
1867         if (hw->queues >= IEEE80211_NUM_ACS) {
1868                 list_for_each_entry(sdata, &local->interfaces, list) {
1869                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1870                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1871                             !ieee80211_sdata_running(sdata))
1872                                 continue;
1873
1874                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1875                                 drv_conf_tx(local, sdata, i,
1876                                             &sdata->tx_conf[i]);
1877                 }
1878         }
1879
1880         /* reconfigure hardware */
1881         ieee80211_hw_config(local, ~0);
1882
1883         ieee80211_configure_filter(local);
1884
1885         /* Finally also reconfigure all the BSS information */
1886         list_for_each_entry(sdata, &local->interfaces, list) {
1887                 u32 changed;
1888
1889                 if (!ieee80211_sdata_running(sdata))
1890                         continue;
1891
1892                 /* common change flags for all interface types */
1893                 changed = BSS_CHANGED_ERP_CTS_PROT |
1894                           BSS_CHANGED_ERP_PREAMBLE |
1895                           BSS_CHANGED_ERP_SLOT |
1896                           BSS_CHANGED_HT |
1897                           BSS_CHANGED_BASIC_RATES |
1898                           BSS_CHANGED_BEACON_INT |
1899                           BSS_CHANGED_BSSID |
1900                           BSS_CHANGED_CQM |
1901                           BSS_CHANGED_QOS |
1902                           BSS_CHANGED_IDLE |
1903                           BSS_CHANGED_TXPOWER;
1904
1905                 switch (sdata->vif.type) {
1906                 case NL80211_IFTYPE_STATION:
1907                         changed |= BSS_CHANGED_ASSOC |
1908                                    BSS_CHANGED_ARP_FILTER |
1909                                    BSS_CHANGED_PS;
1910
1911                         /* Re-send beacon info report to the driver */
1912                         if (sdata->u.mgd.have_beacon)
1913                                 changed |= BSS_CHANGED_BEACON_INFO;
1914
1915                         sdata_lock(sdata);
1916                         ieee80211_bss_info_change_notify(sdata, changed);
1917                         sdata_unlock(sdata);
1918                         break;
1919                 case NL80211_IFTYPE_OCB:
1920                         changed |= BSS_CHANGED_OCB;
1921                         ieee80211_bss_info_change_notify(sdata, changed);
1922                         break;
1923                 case NL80211_IFTYPE_ADHOC:
1924                         changed |= BSS_CHANGED_IBSS;
1925                         /* fall through */
1926                 case NL80211_IFTYPE_AP:
1927                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1928
1929                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1930                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1931
1932                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1933                                         drv_start_ap(local, sdata);
1934                         }
1935
1936                         /* fall through */
1937                 case NL80211_IFTYPE_MESH_POINT:
1938                         if (sdata->vif.bss_conf.enable_beacon) {
1939                                 changed |= BSS_CHANGED_BEACON |
1940                                            BSS_CHANGED_BEACON_ENABLED;
1941                                 ieee80211_bss_info_change_notify(sdata, changed);
1942                         }
1943                         break;
1944                 case NL80211_IFTYPE_WDS:
1945                 case NL80211_IFTYPE_AP_VLAN:
1946                 case NL80211_IFTYPE_MONITOR:
1947                 case NL80211_IFTYPE_P2P_DEVICE:
1948                         /* nothing to do */
1949                         break;
1950                 case NL80211_IFTYPE_UNSPECIFIED:
1951                 case NUM_NL80211_IFTYPES:
1952                 case NL80211_IFTYPE_P2P_CLIENT:
1953                 case NL80211_IFTYPE_P2P_GO:
1954                         WARN_ON(1);
1955                         break;
1956                 }
1957         }
1958
1959         ieee80211_recalc_ps(local);
1960
1961         /*
1962          * The sta might be in psm against the ap (e.g. because
1963          * this was the state before a hw restart), so we
1964          * explicitly send a null packet in order to make sure
1965          * it'll sync against the ap (and get out of psm).
1966          */
1967         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1968                 list_for_each_entry(sdata, &local->interfaces, list) {
1969                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1970                                 continue;
1971                         if (!sdata->u.mgd.associated)
1972                                 continue;
1973
1974                         ieee80211_send_nullfunc(local, sdata, false);
1975                 }
1976         }
1977
1978         /* APs are now beaconing, add back stations */
1979         mutex_lock(&local->sta_mtx);
1980         list_for_each_entry(sta, &local->sta_list, list) {
1981                 enum ieee80211_sta_state state;
1982
1983                 if (!sta->uploaded)
1984                         continue;
1985
1986                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1987                         continue;
1988
1989                 for (state = IEEE80211_STA_NOTEXIST;
1990                      state < sta->sta_state; state++)
1991                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1992                                               state + 1));
1993         }
1994         mutex_unlock(&local->sta_mtx);
1995
1996         /* add back keys */
1997         list_for_each_entry(sdata, &local->interfaces, list)
1998                 ieee80211_reset_crypto_tx_tailroom(sdata);
1999
2000         list_for_each_entry(sdata, &local->interfaces, list)
2001                 if (ieee80211_sdata_running(sdata))
2002                         ieee80211_enable_keys(sdata);
2003
2004         /* Reconfigure sched scan if it was interrupted by FW restart */
2005         mutex_lock(&local->mtx);
2006         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
2007                                                 lockdep_is_held(&local->mtx));
2008         sched_scan_req = rcu_dereference_protected(local->sched_scan_req,
2009                                                 lockdep_is_held(&local->mtx));
2010         if (sched_scan_sdata && sched_scan_req)
2011                 /*
2012                  * Sched scan stopped, but we don't want to report it. Instead,
2013                  * we're trying to reschedule. However, if more than one scan
2014                  * plan was set, we cannot reschedule since we don't know which
2015                  * scan plan was currently running (and some scan plans may have
2016                  * already finished).
2017                  */
2018                 if (sched_scan_req->n_scan_plans > 1 ||
2019                     __ieee80211_request_sched_scan_start(sched_scan_sdata,
2020                                                          sched_scan_req))
2021                         sched_scan_stopped = true;
2022         mutex_unlock(&local->mtx);
2023
2024         if (sched_scan_stopped)
2025                 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
2026
2027  wake_up:
2028         local->in_reconfig = false;
2029         barrier();
2030
2031         if (local->monitors == local->open_count && local->monitors > 0)
2032                 ieee80211_add_virtual_monitor(local);
2033
2034         /*
2035          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
2036          * sessions can be established after a resume.
2037          *
2038          * Also tear down aggregation sessions since reconfiguring
2039          * them in a hardware restart scenario is not easily done
2040          * right now, and the hardware will have lost information
2041          * about the sessions, but we and the AP still think they
2042          * are active. This is really a workaround though.
2043          */
2044         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
2045                 mutex_lock(&local->sta_mtx);
2046
2047                 list_for_each_entry(sta, &local->sta_list, list) {
2048                         if (!local->resuming)
2049                                 ieee80211_sta_tear_down_BA_sessions(
2050                                                 sta, AGG_STOP_LOCAL_REQUEST);
2051                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
2052                 }
2053
2054                 mutex_unlock(&local->sta_mtx);
2055         }
2056
2057         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
2058                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
2059                                         false);
2060
2061         /*
2062          * If this is for hw restart things are still running.
2063          * We may want to change that later, however.
2064          */
2065         if (local->open_count && (!suspended || reconfig_due_to_wowlan))
2066                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_RESTART);
2067
2068         if (!suspended)
2069                 return 0;
2070
2071 #ifdef CONFIG_PM
2072         /* first set suspended false, then resuming */
2073         local->suspended = false;
2074         mb();
2075         local->resuming = false;
2076
2077         /* It's possible that we don't handle the scan completion in
2078          * time during suspend, so if it's still marked as completed
2079          * here, queue the work and flush it to clean things up.
2080          * Instead of calling the worker function directly here, we
2081          * really queue it to avoid potential races with other flows
2082          * scheduling the same work.
2083          */
2084         if (test_bit(SCAN_COMPLETED, &local->scanning)) {
2085                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
2086                 flush_delayed_work(&local->scan_work);
2087         }
2088
2089         if (local->open_count && !reconfig_due_to_wowlan)
2090                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_SUSPEND);
2091
2092         list_for_each_entry(sdata, &local->interfaces, list) {
2093                 if (!ieee80211_sdata_running(sdata))
2094                         continue;
2095                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2096                         ieee80211_sta_restart(sdata);
2097         }
2098
2099         mod_timer(&local->sta_cleanup, jiffies + 1);
2100 #else
2101         WARN_ON(1);
2102 #endif
2103
2104         return 0;
2105 }
2106
2107 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
2108 {
2109         struct ieee80211_sub_if_data *sdata;
2110         struct ieee80211_local *local;
2111         struct ieee80211_key *key;
2112
2113         if (WARN_ON(!vif))
2114                 return;
2115
2116         sdata = vif_to_sdata(vif);
2117         local = sdata->local;
2118
2119         if (WARN_ON(!local->resuming))
2120                 return;
2121
2122         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2123                 return;
2124
2125         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
2126
2127         mutex_lock(&local->key_mtx);
2128         list_for_each_entry(key, &sdata->key_list, list)
2129                 key->flags |= KEY_FLAG_TAINTED;
2130         mutex_unlock(&local->key_mtx);
2131 }
2132 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
2133
2134 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
2135 {
2136         struct ieee80211_local *local = sdata->local;
2137         struct ieee80211_chanctx_conf *chanctx_conf;
2138         struct ieee80211_chanctx *chanctx;
2139
2140         mutex_lock(&local->chanctx_mtx);
2141
2142         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2143                                         lockdep_is_held(&local->chanctx_mtx));
2144
2145         /*
2146          * This function can be called from a work, thus it may be possible
2147          * that the chanctx_conf is removed (due to a disconnection, for
2148          * example).
2149          * So nothing should be done in such case.
2150          */
2151         if (!chanctx_conf)
2152                 goto unlock;
2153
2154         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2155         ieee80211_recalc_smps_chanctx(local, chanctx);
2156  unlock:
2157         mutex_unlock(&local->chanctx_mtx);
2158 }
2159
2160 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
2161 {
2162         struct ieee80211_local *local = sdata->local;
2163         struct ieee80211_chanctx_conf *chanctx_conf;
2164         struct ieee80211_chanctx *chanctx;
2165
2166         mutex_lock(&local->chanctx_mtx);
2167
2168         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2169                                         lockdep_is_held(&local->chanctx_mtx));
2170
2171         if (WARN_ON_ONCE(!chanctx_conf))
2172                 goto unlock;
2173
2174         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2175         ieee80211_recalc_chanctx_min_def(local, chanctx);
2176  unlock:
2177         mutex_unlock(&local->chanctx_mtx);
2178 }
2179
2180 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
2181 {
2182         size_t pos = offset;
2183
2184         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
2185                 pos += 2 + ies[pos + 1];
2186
2187         return pos;
2188 }
2189
2190 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
2191                                             int rssi_min_thold,
2192                                             int rssi_max_thold)
2193 {
2194         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
2195
2196         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2197                 return;
2198
2199         /*
2200          * Scale up threshold values before storing it, as the RSSI averaging
2201          * algorithm uses a scaled up value as well. Change this scaling
2202          * factor if the RSSI averaging algorithm changes.
2203          */
2204         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
2205         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
2206 }
2207
2208 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
2209                                     int rssi_min_thold,
2210                                     int rssi_max_thold)
2211 {
2212         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2213
2214         WARN_ON(rssi_min_thold == rssi_max_thold ||
2215                 rssi_min_thold > rssi_max_thold);
2216
2217         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2218                                        rssi_max_thold);
2219 }
2220 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2221
2222 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2223 {
2224         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2225
2226         _ieee80211_enable_rssi_reports(sdata, 0, 0);
2227 }
2228 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2229
2230 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2231                               u16 cap)
2232 {
2233         __le16 tmp;
2234
2235         *pos++ = WLAN_EID_HT_CAPABILITY;
2236         *pos++ = sizeof(struct ieee80211_ht_cap);
2237         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2238
2239         /* capability flags */
2240         tmp = cpu_to_le16(cap);
2241         memcpy(pos, &tmp, sizeof(u16));
2242         pos += sizeof(u16);
2243
2244         /* AMPDU parameters */
2245         *pos++ = ht_cap->ampdu_factor |
2246                  (ht_cap->ampdu_density <<
2247                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2248
2249         /* MCS set */
2250         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2251         pos += sizeof(ht_cap->mcs);
2252
2253         /* extended capabilities */
2254         pos += sizeof(__le16);
2255
2256         /* BF capabilities */
2257         pos += sizeof(__le32);
2258
2259         /* antenna selection */
2260         pos += sizeof(u8);
2261
2262         return pos;
2263 }
2264
2265 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2266                                u32 cap)
2267 {
2268         __le32 tmp;
2269
2270         *pos++ = WLAN_EID_VHT_CAPABILITY;
2271         *pos++ = sizeof(struct ieee80211_vht_cap);
2272         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2273
2274         /* capability flags */
2275         tmp = cpu_to_le32(cap);
2276         memcpy(pos, &tmp, sizeof(u32));
2277         pos += sizeof(u32);
2278
2279         /* VHT MCS set */
2280         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2281         pos += sizeof(vht_cap->vht_mcs);
2282
2283         return pos;
2284 }
2285
2286 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2287                                const struct cfg80211_chan_def *chandef,
2288                                u16 prot_mode, bool rifs_mode)
2289 {
2290         struct ieee80211_ht_operation *ht_oper;
2291         /* Build HT Information */
2292         *pos++ = WLAN_EID_HT_OPERATION;
2293         *pos++ = sizeof(struct ieee80211_ht_operation);
2294         ht_oper = (struct ieee80211_ht_operation *)pos;
2295         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2296                                         chandef->chan->center_freq);
2297         switch (chandef->width) {
2298         case NL80211_CHAN_WIDTH_160:
2299         case NL80211_CHAN_WIDTH_80P80:
2300         case NL80211_CHAN_WIDTH_80:
2301         case NL80211_CHAN_WIDTH_40:
2302                 if (chandef->center_freq1 > chandef->chan->center_freq)
2303                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2304                 else
2305                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2306                 break;
2307         default:
2308                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2309                 break;
2310         }
2311         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2312             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2313             chandef->width != NL80211_CHAN_WIDTH_20)
2314                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2315
2316         if (rifs_mode)
2317                 ht_oper->ht_param |= IEEE80211_HT_PARAM_RIFS_MODE;
2318
2319         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2320         ht_oper->stbc_param = 0x0000;
2321
2322         /* It seems that Basic MCS set and Supported MCS set
2323            are identical for the first 10 bytes */
2324         memset(&ht_oper->basic_set, 0, 16);
2325         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2326
2327         return pos + sizeof(struct ieee80211_ht_operation);
2328 }
2329
2330 u8 *ieee80211_ie_build_vht_oper(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2331                                 const struct cfg80211_chan_def *chandef)
2332 {
2333         struct ieee80211_vht_operation *vht_oper;
2334
2335         *pos++ = WLAN_EID_VHT_OPERATION;
2336         *pos++ = sizeof(struct ieee80211_vht_operation);
2337         vht_oper = (struct ieee80211_vht_operation *)pos;
2338         vht_oper->center_freq_seg1_idx = ieee80211_frequency_to_channel(
2339                                                         chandef->center_freq1);
2340         if (chandef->center_freq2)
2341                 vht_oper->center_freq_seg2_idx =
2342                         ieee80211_frequency_to_channel(chandef->center_freq2);
2343         else
2344                 vht_oper->center_freq_seg2_idx = 0x00;
2345
2346         switch (chandef->width) {
2347         case NL80211_CHAN_WIDTH_160:
2348                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_160MHZ;
2349                 break;
2350         case NL80211_CHAN_WIDTH_80P80:
2351                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80P80MHZ;
2352                 break;
2353         case NL80211_CHAN_WIDTH_80:
2354                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2355                 break;
2356         default:
2357                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
2358                 break;
2359         }
2360
2361         /* don't require special VHT peer rates */
2362         vht_oper->basic_mcs_set = cpu_to_le16(0xffff);
2363
2364         return pos + sizeof(struct ieee80211_vht_operation);
2365 }
2366
2367 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2368                                   const struct ieee80211_ht_operation *ht_oper,
2369                                   struct cfg80211_chan_def *chandef)
2370 {
2371         enum nl80211_channel_type channel_type;
2372
2373         if (!ht_oper) {
2374                 cfg80211_chandef_create(chandef, control_chan,
2375                                         NL80211_CHAN_NO_HT);
2376                 return;
2377         }
2378
2379         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2380         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2381                 channel_type = NL80211_CHAN_HT20;
2382                 break;
2383         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2384                 channel_type = NL80211_CHAN_HT40PLUS;
2385                 break;
2386         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2387                 channel_type = NL80211_CHAN_HT40MINUS;
2388                 break;
2389         default:
2390                 channel_type = NL80211_CHAN_NO_HT;
2391         }
2392
2393         cfg80211_chandef_create(chandef, control_chan, channel_type);
2394 }
2395
2396 void ieee80211_vht_oper_to_chandef(struct ieee80211_channel *control_chan,
2397                                    const struct ieee80211_vht_operation *oper,
2398                                    struct cfg80211_chan_def *chandef)
2399 {
2400         if (!oper)
2401                 return;
2402
2403         chandef->chan = control_chan;
2404
2405         switch (oper->chan_width) {
2406         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2407                 break;
2408         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2409                 chandef->width = NL80211_CHAN_WIDTH_80;
2410                 break;
2411         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2412                 chandef->width = NL80211_CHAN_WIDTH_160;
2413                 break;
2414         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2415                 chandef->width = NL80211_CHAN_WIDTH_80P80;
2416                 break;
2417         default:
2418                 break;
2419         }
2420
2421         chandef->center_freq1 =
2422                 ieee80211_channel_to_frequency(oper->center_freq_seg1_idx,
2423                                                control_chan->band);
2424         chandef->center_freq2 =
2425                 ieee80211_channel_to_frequency(oper->center_freq_seg2_idx,
2426                                                control_chan->band);
2427 }
2428
2429 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2430                              const struct ieee80211_supported_band *sband,
2431                              const u8 *srates, int srates_len, u32 *rates)
2432 {
2433         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2434         int shift = ieee80211_chandef_get_shift(chandef);
2435         struct ieee80211_rate *br;
2436         int brate, rate, i, j, count = 0;
2437
2438         *rates = 0;
2439
2440         for (i = 0; i < srates_len; i++) {
2441                 rate = srates[i] & 0x7f;
2442
2443                 for (j = 0; j < sband->n_bitrates; j++) {
2444                         br = &sband->bitrates[j];
2445                         if ((rate_flags & br->flags) != rate_flags)
2446                                 continue;
2447
2448                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2449                         if (brate == rate) {
2450                                 *rates |= BIT(j);
2451                                 count++;
2452                                 break;
2453                         }
2454                 }
2455         }
2456         return count;
2457 }
2458
2459 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2460                             struct sk_buff *skb, bool need_basic,
2461                             enum ieee80211_band band)
2462 {
2463         struct ieee80211_local *local = sdata->local;
2464         struct ieee80211_supported_band *sband;
2465         int rate, shift;
2466         u8 i, rates, *pos;
2467         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2468         u32 rate_flags;
2469
2470         shift = ieee80211_vif_get_shift(&sdata->vif);
2471         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2472         sband = local->hw.wiphy->bands[band];
2473         rates = 0;
2474         for (i = 0; i < sband->n_bitrates; i++) {
2475                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2476                         continue;
2477                 rates++;
2478         }
2479         if (rates > 8)
2480                 rates = 8;
2481
2482         if (skb_tailroom(skb) < rates + 2)
2483                 return -ENOMEM;
2484
2485         pos = skb_put(skb, rates + 2);
2486         *pos++ = WLAN_EID_SUPP_RATES;
2487         *pos++ = rates;
2488         for (i = 0; i < rates; i++) {
2489                 u8 basic = 0;
2490                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2491                         continue;
2492
2493                 if (need_basic && basic_rates & BIT(i))
2494                         basic = 0x80;
2495                 rate = sband->bitrates[i].bitrate;
2496                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2497                                     5 * (1 << shift));
2498                 *pos++ = basic | (u8) rate;
2499         }
2500
2501         return 0;
2502 }
2503
2504 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2505                                 struct sk_buff *skb, bool need_basic,
2506                                 enum ieee80211_band band)
2507 {
2508         struct ieee80211_local *local = sdata->local;
2509         struct ieee80211_supported_band *sband;
2510         int rate, shift;
2511         u8 i, exrates, *pos;
2512         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2513         u32 rate_flags;
2514
2515         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2516         shift = ieee80211_vif_get_shift(&sdata->vif);
2517
2518         sband = local->hw.wiphy->bands[band];
2519         exrates = 0;
2520         for (i = 0; i < sband->n_bitrates; i++) {
2521                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2522                         continue;
2523                 exrates++;
2524         }
2525
2526         if (exrates > 8)
2527                 exrates -= 8;
2528         else
2529                 exrates = 0;
2530
2531         if (skb_tailroom(skb) < exrates + 2)
2532                 return -ENOMEM;
2533
2534         if (exrates) {
2535                 pos = skb_put(skb, exrates + 2);
2536                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2537                 *pos++ = exrates;
2538                 for (i = 8; i < sband->n_bitrates; i++) {
2539                         u8 basic = 0;
2540                         if ((rate_flags & sband->bitrates[i].flags)
2541                             != rate_flags)
2542                                 continue;
2543                         if (need_basic && basic_rates & BIT(i))
2544                                 basic = 0x80;
2545                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2546                                             5 * (1 << shift));
2547                         *pos++ = basic | (u8) rate;
2548                 }
2549         }
2550         return 0;
2551 }
2552
2553 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2554 {
2555         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2556         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2557
2558         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2559                 /* non-managed type inferfaces */
2560                 return 0;
2561         }
2562         return -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
2563 }
2564 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2565
2566 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2567 {
2568         if (!mcs)
2569                 return 1;
2570
2571         /* TODO: consider rx_highest */
2572
2573         if (mcs->rx_mask[3])
2574                 return 4;
2575         if (mcs->rx_mask[2])
2576                 return 3;
2577         if (mcs->rx_mask[1])
2578                 return 2;
2579         return 1;
2580 }
2581
2582 /**
2583  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2584  * @local: mac80211 hw info struct
2585  * @status: RX status
2586  * @mpdu_len: total MPDU length (including FCS)
2587  * @mpdu_offset: offset into MPDU to calculate timestamp at
2588  *
2589  * This function calculates the RX timestamp at the given MPDU offset, taking
2590  * into account what the RX timestamp was. An offset of 0 will just normalize
2591  * the timestamp to TSF at beginning of MPDU reception.
2592  */
2593 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2594                                      struct ieee80211_rx_status *status,
2595                                      unsigned int mpdu_len,
2596                                      unsigned int mpdu_offset)
2597 {
2598         u64 ts = status->mactime;
2599         struct rate_info ri;
2600         u16 rate;
2601
2602         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2603                 return 0;
2604
2605         memset(&ri, 0, sizeof(ri));
2606
2607         /* Fill cfg80211 rate info */
2608         if (status->flag & RX_FLAG_HT) {
2609                 ri.mcs = status->rate_idx;
2610                 ri.flags |= RATE_INFO_FLAGS_MCS;
2611                 if (status->flag & RX_FLAG_40MHZ)
2612                         ri.bw = RATE_INFO_BW_40;
2613                 else
2614                         ri.bw = RATE_INFO_BW_20;
2615                 if (status->flag & RX_FLAG_SHORT_GI)
2616                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2617         } else if (status->flag & RX_FLAG_VHT) {
2618                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2619                 ri.mcs = status->rate_idx;
2620                 ri.nss = status->vht_nss;
2621                 if (status->flag & RX_FLAG_40MHZ)
2622                         ri.bw = RATE_INFO_BW_40;
2623                 else if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2624                         ri.bw = RATE_INFO_BW_80;
2625                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2626                         ri.bw = RATE_INFO_BW_160;
2627                 else
2628                         ri.bw = RATE_INFO_BW_20;
2629                 if (status->flag & RX_FLAG_SHORT_GI)
2630                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2631         } else {
2632                 struct ieee80211_supported_band *sband;
2633                 int shift = 0;
2634                 int bitrate;
2635
2636                 if (status->flag & RX_FLAG_10MHZ) {
2637                         shift = 1;
2638                         ri.bw = RATE_INFO_BW_10;
2639                 } else if (status->flag & RX_FLAG_5MHZ) {
2640                         shift = 2;
2641                         ri.bw = RATE_INFO_BW_5;
2642                 } else {
2643                         ri.bw = RATE_INFO_BW_20;
2644                 }
2645
2646                 sband = local->hw.wiphy->bands[status->band];
2647                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2648                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2649         }
2650
2651         rate = cfg80211_calculate_bitrate(&ri);
2652         if (WARN_ONCE(!rate,
2653                       "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2654                       status->flag, status->rate_idx, status->vht_nss))
2655                 return 0;
2656
2657         /* rewind from end of MPDU */
2658         if (status->flag & RX_FLAG_MACTIME_END)
2659                 ts -= mpdu_len * 8 * 10 / rate;
2660
2661         ts += mpdu_offset * 8 * 10 / rate;
2662
2663         return ts;
2664 }
2665
2666 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2667 {
2668         struct ieee80211_sub_if_data *sdata;
2669         struct cfg80211_chan_def chandef;
2670
2671         mutex_lock(&local->mtx);
2672         mutex_lock(&local->iflist_mtx);
2673         list_for_each_entry(sdata, &local->interfaces, list) {
2674                 /* it might be waiting for the local->mtx, but then
2675                  * by the time it gets it, sdata->wdev.cac_started
2676                  * will no longer be true
2677                  */
2678                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2679
2680                 if (sdata->wdev.cac_started) {
2681                         chandef = sdata->vif.bss_conf.chandef;
2682                         ieee80211_vif_release_channel(sdata);
2683                         cfg80211_cac_event(sdata->dev,
2684                                            &chandef,
2685                                            NL80211_RADAR_CAC_ABORTED,
2686                                            GFP_KERNEL);
2687                 }
2688         }
2689         mutex_unlock(&local->iflist_mtx);
2690         mutex_unlock(&local->mtx);
2691 }
2692
2693 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2694 {
2695         struct ieee80211_local *local =
2696                 container_of(work, struct ieee80211_local, radar_detected_work);
2697         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2698         struct ieee80211_chanctx *ctx;
2699         int num_chanctx = 0;
2700
2701         mutex_lock(&local->chanctx_mtx);
2702         list_for_each_entry(ctx, &local->chanctx_list, list) {
2703                 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
2704                         continue;
2705
2706                 num_chanctx++;
2707                 chandef = ctx->conf.def;
2708         }
2709         mutex_unlock(&local->chanctx_mtx);
2710
2711         ieee80211_dfs_cac_cancel(local);
2712
2713         if (num_chanctx > 1)
2714                 /* XXX: multi-channel is not supported yet */
2715                 WARN_ON(1);
2716         else
2717                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2718 }
2719
2720 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2721 {
2722         struct ieee80211_local *local = hw_to_local(hw);
2723
2724         trace_api_radar_detected(local);
2725
2726         ieee80211_queue_work(hw, &local->radar_detected_work);
2727 }
2728 EXPORT_SYMBOL(ieee80211_radar_detected);
2729
2730 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2731 {
2732         u32 ret;
2733         int tmp;
2734
2735         switch (c->width) {
2736         case NL80211_CHAN_WIDTH_20:
2737                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2738                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2739                 break;
2740         case NL80211_CHAN_WIDTH_40:
2741                 c->width = NL80211_CHAN_WIDTH_20;
2742                 c->center_freq1 = c->chan->center_freq;
2743                 ret = IEEE80211_STA_DISABLE_40MHZ |
2744                       IEEE80211_STA_DISABLE_VHT;
2745                 break;
2746         case NL80211_CHAN_WIDTH_80:
2747                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2748                 /* n_P40 */
2749                 tmp /= 2;
2750                 /* freq_P40 */
2751                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2752                 c->width = NL80211_CHAN_WIDTH_40;
2753                 ret = IEEE80211_STA_DISABLE_VHT;
2754                 break;
2755         case NL80211_CHAN_WIDTH_80P80:
2756                 c->center_freq2 = 0;
2757                 c->width = NL80211_CHAN_WIDTH_80;
2758                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2759                       IEEE80211_STA_DISABLE_160MHZ;
2760                 break;
2761         case NL80211_CHAN_WIDTH_160:
2762                 /* n_P20 */
2763                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2764                 /* n_P80 */
2765                 tmp /= 4;
2766                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2767                 c->width = NL80211_CHAN_WIDTH_80;
2768                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2769                       IEEE80211_STA_DISABLE_160MHZ;
2770                 break;
2771         default:
2772         case NL80211_CHAN_WIDTH_20_NOHT:
2773                 WARN_ON_ONCE(1);
2774                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2775                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2776                 break;
2777         case NL80211_CHAN_WIDTH_5:
2778         case NL80211_CHAN_WIDTH_10:
2779                 WARN_ON_ONCE(1);
2780                 /* keep c->width */
2781                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2782                 break;
2783         }
2784
2785         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2786
2787         return ret;
2788 }
2789
2790 /*
2791  * Returns true if smps_mode_new is strictly more restrictive than
2792  * smps_mode_old.
2793  */
2794 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2795                                    enum ieee80211_smps_mode smps_mode_new)
2796 {
2797         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2798                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2799                 return false;
2800
2801         switch (smps_mode_old) {
2802         case IEEE80211_SMPS_STATIC:
2803                 return false;
2804         case IEEE80211_SMPS_DYNAMIC:
2805                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2806         case IEEE80211_SMPS_OFF:
2807                 return smps_mode_new != IEEE80211_SMPS_OFF;
2808         default:
2809                 WARN_ON(1);
2810         }
2811
2812         return false;
2813 }
2814
2815 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2816                               struct cfg80211_csa_settings *csa_settings)
2817 {
2818         struct sk_buff *skb;
2819         struct ieee80211_mgmt *mgmt;
2820         struct ieee80211_local *local = sdata->local;
2821         int freq;
2822         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2823                                sizeof(mgmt->u.action.u.chan_switch);
2824         u8 *pos;
2825
2826         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2827             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2828                 return -EOPNOTSUPP;
2829
2830         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2831                             5 + /* channel switch announcement element */
2832                             3 + /* secondary channel offset element */
2833                             8); /* mesh channel switch parameters element */
2834         if (!skb)
2835                 return -ENOMEM;
2836
2837         skb_reserve(skb, local->tx_headroom);
2838         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2839         memset(mgmt, 0, hdr_len);
2840         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2841                                           IEEE80211_STYPE_ACTION);
2842
2843         eth_broadcast_addr(mgmt->da);
2844         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2845         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2846                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2847         } else {
2848                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2849                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2850         }
2851         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2852         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2853         pos = skb_put(skb, 5);
2854         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
2855         *pos++ = 3;                                             /* IE length */
2856         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
2857         freq = csa_settings->chandef.chan->center_freq;
2858         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
2859         *pos++ = csa_settings->count;                           /* count */
2860
2861         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2862                 enum nl80211_channel_type ch_type;
2863
2864                 skb_put(skb, 3);
2865                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
2866                 *pos++ = 1;                                     /* IE length */
2867                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2868                 if (ch_type == NL80211_CHAN_HT40PLUS)
2869                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2870                 else
2871                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2872         }
2873
2874         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2875                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2876
2877                 skb_put(skb, 8);
2878                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
2879                 *pos++ = 6;                                     /* IE length */
2880                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
2881                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
2882                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2883                 *pos++ |= csa_settings->block_tx ?
2884                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2885                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2886                 pos += 2;
2887                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2888                 pos += 2;
2889         }
2890
2891         ieee80211_tx_skb(sdata, skb);
2892         return 0;
2893 }
2894
2895 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2896 {
2897         return !(cs == NULL || cs->cipher == 0 ||
2898                  cs->hdr_len < cs->pn_len + cs->pn_off ||
2899                  cs->hdr_len <= cs->key_idx_off ||
2900                  cs->key_idx_shift > 7 ||
2901                  cs->key_idx_mask == 0);
2902 }
2903
2904 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2905 {
2906         int i;
2907
2908         /* Ensure we have enough iftype bitmap space for all iftype values */
2909         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2910
2911         for (i = 0; i < n; i++)
2912                 if (!ieee80211_cs_valid(&cs[i]))
2913                         return false;
2914
2915         return true;
2916 }
2917
2918 const struct ieee80211_cipher_scheme *
2919 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2920                  enum nl80211_iftype iftype)
2921 {
2922         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2923         int n = local->hw.n_cipher_schemes;
2924         int i;
2925         const struct ieee80211_cipher_scheme *cs = NULL;
2926
2927         for (i = 0; i < n; i++) {
2928                 if (l[i].cipher == cipher) {
2929                         cs = &l[i];
2930                         break;
2931                 }
2932         }
2933
2934         if (!cs || !(cs->iftype & BIT(iftype)))
2935                 return NULL;
2936
2937         return cs;
2938 }
2939
2940 int ieee80211_cs_headroom(struct ieee80211_local *local,
2941                           struct cfg80211_crypto_settings *crypto,
2942                           enum nl80211_iftype iftype)
2943 {
2944         const struct ieee80211_cipher_scheme *cs;
2945         int headroom = IEEE80211_ENCRYPT_HEADROOM;
2946         int i;
2947
2948         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
2949                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
2950                                       iftype);
2951
2952                 if (cs && headroom < cs->hdr_len)
2953                         headroom = cs->hdr_len;
2954         }
2955
2956         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
2957         if (cs && headroom < cs->hdr_len)
2958                 headroom = cs->hdr_len;
2959
2960         return headroom;
2961 }
2962
2963 static bool
2964 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
2965 {
2966         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
2967         int skip;
2968
2969         if (end > 0)
2970                 return false;
2971
2972         /* One shot NOA  */
2973         if (data->count[i] == 1)
2974                 return false;
2975
2976         if (data->desc[i].interval == 0)
2977                 return false;
2978
2979         /* End time is in the past, check for repetitions */
2980         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
2981         if (data->count[i] < 255) {
2982                 if (data->count[i] <= skip) {
2983                         data->count[i] = 0;
2984                         return false;
2985                 }
2986
2987                 data->count[i] -= skip;
2988         }
2989
2990         data->desc[i].start += skip * data->desc[i].interval;
2991
2992         return true;
2993 }
2994
2995 static bool
2996 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
2997                              s32 *offset)
2998 {
2999         bool ret = false;
3000         int i;
3001
3002         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3003                 s32 cur;
3004
3005                 if (!data->count[i])
3006                         continue;
3007
3008                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
3009                         ret = true;
3010
3011                 cur = data->desc[i].start - tsf;
3012                 if (cur > *offset)
3013                         continue;
3014
3015                 cur = data->desc[i].start + data->desc[i].duration - tsf;
3016                 if (cur > *offset)
3017                         *offset = cur;
3018         }
3019
3020         return ret;
3021 }
3022
3023 static u32
3024 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
3025 {
3026         s32 offset = 0;
3027         int tries = 0;
3028         /*
3029          * arbitrary limit, used to avoid infinite loops when combined NoA
3030          * descriptors cover the full time period.
3031          */
3032         int max_tries = 5;
3033
3034         ieee80211_extend_absent_time(data, tsf, &offset);
3035         do {
3036                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
3037                         break;
3038
3039                 tries++;
3040         } while (tries < max_tries);
3041
3042         return offset;
3043 }
3044
3045 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
3046 {
3047         u32 next_offset = BIT(31) - 1;
3048         int i;
3049
3050         data->absent = 0;
3051         data->has_next_tsf = false;
3052         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3053                 s32 start;
3054
3055                 if (!data->count[i])
3056                         continue;
3057
3058                 ieee80211_extend_noa_desc(data, tsf, i);
3059                 start = data->desc[i].start - tsf;
3060                 if (start <= 0)
3061                         data->absent |= BIT(i);
3062
3063                 if (next_offset > start)
3064                         next_offset = start;
3065
3066                 data->has_next_tsf = true;
3067         }
3068
3069         if (data->absent)
3070                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
3071
3072         data->next_tsf = tsf + next_offset;
3073 }
3074 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
3075
3076 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
3077                             struct ieee80211_noa_data *data, u32 tsf)
3078 {
3079         int ret = 0;
3080         int i;
3081
3082         memset(data, 0, sizeof(*data));
3083
3084         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3085                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
3086
3087                 if (!desc->count || !desc->duration)
3088                         continue;
3089
3090                 data->count[i] = desc->count;
3091                 data->desc[i].start = le32_to_cpu(desc->start_time);
3092                 data->desc[i].duration = le32_to_cpu(desc->duration);
3093                 data->desc[i].interval = le32_to_cpu(desc->interval);
3094
3095                 if (data->count[i] > 1 &&
3096                     data->desc[i].interval < data->desc[i].duration)
3097                         continue;
3098
3099                 ieee80211_extend_noa_desc(data, tsf, i);
3100                 ret++;
3101         }
3102
3103         if (ret)
3104                 ieee80211_update_p2p_noa(data, tsf);
3105
3106         return ret;
3107 }
3108 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
3109
3110 void ieee80211_recalc_dtim(struct ieee80211_local *local,
3111                            struct ieee80211_sub_if_data *sdata)
3112 {
3113         u64 tsf = drv_get_tsf(local, sdata);
3114         u64 dtim_count = 0;
3115         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
3116         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
3117         struct ps_data *ps;
3118         u8 bcns_from_dtim;
3119
3120         if (tsf == -1ULL || !beacon_int || !dtim_period)
3121                 return;
3122
3123         if (sdata->vif.type == NL80211_IFTYPE_AP ||
3124             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
3125                 if (!sdata->bss)
3126                         return;
3127
3128                 ps = &sdata->bss->ps;
3129         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3130                 ps = &sdata->u.mesh.ps;
3131         } else {
3132                 return;
3133         }
3134
3135         /*
3136          * actually finds last dtim_count, mac80211 will update in
3137          * __beacon_add_tim().
3138          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
3139          */
3140         do_div(tsf, beacon_int);
3141         bcns_from_dtim = do_div(tsf, dtim_period);
3142         /* just had a DTIM */
3143         if (!bcns_from_dtim)
3144                 dtim_count = 0;
3145         else
3146                 dtim_count = dtim_period - bcns_from_dtim;
3147
3148         ps->dtim_count = dtim_count;
3149 }
3150
3151 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
3152                                          struct ieee80211_chanctx *ctx)
3153 {
3154         struct ieee80211_sub_if_data *sdata;
3155         u8 radar_detect = 0;
3156
3157         lockdep_assert_held(&local->chanctx_mtx);
3158
3159         if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
3160                 return 0;
3161
3162         list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
3163                 if (sdata->reserved_radar_required)
3164                         radar_detect |= BIT(sdata->reserved_chandef.width);
3165
3166         /*
3167          * An in-place reservation context should not have any assigned vifs
3168          * until it replaces the other context.
3169          */
3170         WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
3171                 !list_empty(&ctx->assigned_vifs));
3172
3173         list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
3174                 if (sdata->radar_required)
3175                         radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
3176
3177         return radar_detect;
3178 }
3179
3180 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
3181                                  const struct cfg80211_chan_def *chandef,
3182                                  enum ieee80211_chanctx_mode chanmode,
3183                                  u8 radar_detect)
3184 {
3185         struct ieee80211_local *local = sdata->local;
3186         struct ieee80211_sub_if_data *sdata_iter;
3187         enum nl80211_iftype iftype = sdata->wdev.iftype;
3188         int num[NUM_NL80211_IFTYPES];
3189         struct ieee80211_chanctx *ctx;
3190         int num_different_channels = 0;
3191         int total = 1;
3192
3193         lockdep_assert_held(&local->chanctx_mtx);
3194
3195         if (WARN_ON(hweight32(radar_detect) > 1))
3196                 return -EINVAL;
3197
3198         if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3199                     !chandef->chan))
3200                 return -EINVAL;
3201
3202         if (chandef)
3203                 num_different_channels = 1;
3204
3205         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
3206                 return -EINVAL;
3207
3208         /* Always allow software iftypes */
3209         if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
3210                 if (radar_detect)
3211                         return -EINVAL;
3212                 return 0;
3213         }
3214
3215         memset(num, 0, sizeof(num));
3216
3217         if (iftype != NL80211_IFTYPE_UNSPECIFIED)
3218                 num[iftype] = 1;
3219
3220         list_for_each_entry(ctx, &local->chanctx_list, list) {
3221                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3222                         continue;
3223                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3224                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
3225                         num_different_channels++;
3226                         continue;
3227                 }
3228                 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3229                     cfg80211_chandef_compatible(chandef,
3230                                                 &ctx->conf.def))
3231                         continue;
3232                 num_different_channels++;
3233         }
3234
3235         list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
3236                 struct wireless_dev *wdev_iter;
3237
3238                 wdev_iter = &sdata_iter->wdev;
3239
3240                 if (sdata_iter == sdata ||
3241                     !ieee80211_sdata_running(sdata_iter) ||
3242                     local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
3243                         continue;
3244
3245                 num[wdev_iter->iftype]++;
3246                 total++;
3247         }
3248
3249         if (total == 1 && !radar_detect)
3250                 return 0;
3251
3252         return cfg80211_check_combinations(local->hw.wiphy,
3253                                            num_different_channels,
3254                                            radar_detect, num);
3255 }
3256
3257 static void
3258 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
3259                          void *data)
3260 {
3261         u32 *max_num_different_channels = data;
3262
3263         *max_num_different_channels = max(*max_num_different_channels,
3264                                           c->num_different_channels);
3265 }
3266
3267 int ieee80211_max_num_channels(struct ieee80211_local *local)
3268 {
3269         struct ieee80211_sub_if_data *sdata;
3270         int num[NUM_NL80211_IFTYPES] = {};
3271         struct ieee80211_chanctx *ctx;
3272         int num_different_channels = 0;
3273         u8 radar_detect = 0;
3274         u32 max_num_different_channels = 1;
3275         int err;
3276
3277         lockdep_assert_held(&local->chanctx_mtx);
3278
3279         list_for_each_entry(ctx, &local->chanctx_list, list) {
3280                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3281                         continue;
3282
3283                 num_different_channels++;
3284
3285                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3286         }
3287
3288         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3289                 num[sdata->wdev.iftype]++;
3290
3291         err = cfg80211_iter_combinations(local->hw.wiphy,
3292                                          num_different_channels, radar_detect,
3293                                          num, ieee80211_iter_max_chans,
3294                                          &max_num_different_channels);
3295         if (err < 0)
3296                 return err;
3297
3298         return max_num_different_channels;
3299 }
3300
3301 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
3302 {
3303         *buf++ = WLAN_EID_VENDOR_SPECIFIC;
3304         *buf++ = 7; /* len */
3305         *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
3306         *buf++ = 0x50;
3307         *buf++ = 0xf2;
3308         *buf++ = 2; /* WME */
3309         *buf++ = 0; /* WME info */
3310         *buf++ = 1; /* WME ver */
3311         *buf++ = qosinfo; /* U-APSD no in use */
3312
3313         return buf;
3314 }
3315
3316 void ieee80211_init_tx_queue(struct ieee80211_sub_if_data *sdata,
3317                              struct sta_info *sta,
3318                              struct txq_info *txqi, int tid)
3319 {
3320         skb_queue_head_init(&txqi->queue);
3321         txqi->txq.vif = &sdata->vif;
3322
3323         if (sta) {
3324                 txqi->txq.sta = &sta->sta;
3325                 sta->sta.txq[tid] = &txqi->txq;
3326                 txqi->txq.tid = tid;
3327                 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
3328         } else {
3329                 sdata->vif.txq = &txqi->txq;
3330                 txqi->txq.tid = 0;
3331                 txqi->txq.ac = IEEE80211_AC_BE;
3332         }
3333 }