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) 2015-2017      Intel Deutschland GmbH
   8  * Copyright (C) 2018 Intel Corporation
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * utilities for mac80211
  15  */
  16
  17 #include <net/mac80211.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/export.h>
  20 #include <linux/types.h>
  21 #include <linux/slab.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/if_arp.h>
  25 #include <linux/bitmap.h>
  26 #include <linux/crc32.h>
  27 #include <net/net_namespace.h>
  28 #include <net/cfg80211.h>
  29 #include <net/rtnetlink.h>
  30
  31 #include "ieee80211_i.h"
  32 #include "driver-ops.h"
  33 #include "rate.h"
  34 #include "mesh.h"
  35 #include "wme.h"
  36 #include "led.h"
  37 #include "wep.h"
  38
  39 /* privid for wiphys to determine whether they belong to us or not */
  40 const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid;
  41
  42 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  43 {
  44         struct ieee80211_local *local;
  45         BUG_ON(!wiphy);
  46
  47         local = wiphy_priv(wiphy);
  48         return &local->hw;
  49 }
  50 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  51
  52 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  53 {
  54         struct sk_buff *skb;
  55         struct ieee80211_hdr *hdr;
  56
  57         skb_queue_walk(&tx->skbs, skb) {
  58                 hdr = (struct ieee80211_hdr *) skb->data;
  59                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
  60         }
  61 }
  62
  63 int ieee80211_frame_duration(enum nl80211_band band, size_t len,
  64                              int rate, int erp, int short_preamble,
  65                              int shift)
  66 {
  67         int dur;
  68
  69         /* calculate duration (in microseconds, rounded up to next higher
  70          * integer if it includes a fractional microsecond) to send frame of
  71          * len bytes (does not include FCS) at the given rate. Duration will
  72          * also include SIFS.
  73          *
  74          * rate is in 100 kbps, so divident is multiplied by 10 in the
  75          * DIV_ROUND_UP() operations.
  76          *
  77          * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
  78          * is assumed to be 0 otherwise.
  79          */
  80
  81         if (band == NL80211_BAND_5GHZ || erp) {
  82                 /*
  83                  * OFDM:
  84                  *
  85                  * N_DBPS = DATARATE x 4
  86                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
  87                  *      (16 = SIGNAL time, 6 = tail bits)
  88                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
  89                  *
  90                  * T_SYM = 4 usec
  91                  * 802.11a - 18.5.2: aSIFSTime = 16 usec
  92                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
  93                  *      signal ext = 6 usec
  94                  */
  95                 dur = 16; /* SIFS + signal ext */
  96                 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
  97                 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
  98
  99                 /* IEEE 802.11-2012 18.3.2.4: all values above are:
 100                  *  * times 4 for 5 MHz
 101                  *  * times 2 for 10 MHz
 102                  */
 103                 dur *= 1 << shift;
 104
 105                 /* rates should already consider the channel bandwidth,
 106                  * don't apply divisor again.
 107                  */
 108                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 109                                         4 * rate); /* T_SYM x N_SYM */
 110         } else {
 111                 /*
 112                  * 802.11b or 802.11g with 802.11b compatibility:
 113                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 114                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 115                  *
 116                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 117                  * aSIFSTime = 10 usec
 118                  * aPreambleLength = 144 usec or 72 usec with short preamble
 119                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 120                  */
 121                 dur = 10; /* aSIFSTime = 10 usec */
 122                 dur += short_preamble ? (72 + 24) : (144 + 48);
 123
 124                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 125         }
 126
 127         return dur;
 128 }
 129
 130 /* Exported duration function for driver use */
 131 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 132                                         struct ieee80211_vif *vif,
 133                                         enum nl80211_band band,
 134                                         size_t frame_len,
 135                                         struct ieee80211_rate *rate)
 136 {
 137         struct ieee80211_sub_if_data *sdata;
 138         u16 dur;
 139         int erp, shift = 0;
 140         bool short_preamble = false;
 141
 142         erp = 0;
 143         if (vif) {
 144                 sdata = vif_to_sdata(vif);
 145                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 146                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 147                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 148                 shift = ieee80211_vif_get_shift(vif);
 149         }
 150
 151         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 152                                        short_preamble, shift);
 153
 154         return cpu_to_le16(dur);
 155 }
 156 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 157
 158 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 159                               struct ieee80211_vif *vif, size_t frame_len,
 160                               const struct ieee80211_tx_info *frame_txctl)
 161 {
 162         struct ieee80211_local *local = hw_to_local(hw);
 163         struct ieee80211_rate *rate;
 164         struct ieee80211_sub_if_data *sdata;
 165         bool short_preamble;
 166         int erp, shift = 0, bitrate;
 167         u16 dur;
 168         struct ieee80211_supported_band *sband;
 169
 170         sband = local->hw.wiphy->bands[frame_txctl->band];
 171
 172         short_preamble = false;
 173
 174         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 175
 176         erp = 0;
 177         if (vif) {
 178                 sdata = vif_to_sdata(vif);
 179                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 180                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 181                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 182                 shift = ieee80211_vif_get_shift(vif);
 183         }
 184
 185         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 186
 187         /* CTS duration */
 188         dur = ieee80211_frame_duration(sband->band, 10, bitrate,
 189                                        erp, short_preamble, shift);
 190         /* Data frame duration */
 191         dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
 192                                         erp, short_preamble, shift);
 193         /* ACK duration */
 194         dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 195                                         erp, short_preamble, shift);
 196
 197         return cpu_to_le16(dur);
 198 }
 199 EXPORT_SYMBOL(ieee80211_rts_duration);
 200
 201 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 202                                     struct ieee80211_vif *vif,
 203                                     size_t frame_len,
 204                                     const struct ieee80211_tx_info *frame_txctl)
 205 {
 206         struct ieee80211_local *local = hw_to_local(hw);
 207         struct ieee80211_rate *rate;
 208         struct ieee80211_sub_if_data *sdata;
 209         bool short_preamble;
 210         int erp, shift = 0, bitrate;
 211         u16 dur;
 212         struct ieee80211_supported_band *sband;
 213
 214         sband = local->hw.wiphy->bands[frame_txctl->band];
 215
 216         short_preamble = false;
 217
 218         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 219         erp = 0;
 220         if (vif) {
 221                 sdata = vif_to_sdata(vif);
 222                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 223                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 224                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 225                 shift = ieee80211_vif_get_shift(vif);
 226         }
 227
 228         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 229
 230         /* Data frame duration */
 231         dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
 232                                        erp, short_preamble, shift);
 233         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 234                 /* ACK duration */
 235                 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 236                                                 erp, short_preamble, shift);
 237         }
 238
 239         return cpu_to_le16(dur);
 240 }
 241 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 242
 243 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 244 {
 245         struct ieee80211_sub_if_data *sdata;
 246         int n_acs = IEEE80211_NUM_ACS;
 247
 248         if (local->ops->wake_tx_queue)
 249                 return;
 250
 251         if (local->hw.queues < IEEE80211_NUM_ACS)
 252                 n_acs = 1;
 253
 254         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 255                 int ac;
 256
 257                 if (!sdata->dev)
 258                         continue;
 259
 260                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 261                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 262                         continue;
 263
 264                 for (ac = 0; ac < n_acs; ac++) {
 265                         int ac_queue = sdata->vif.hw_queue[ac];
 266
 267                         if (ac_queue == queue ||
 268                             (sdata->vif.cab_queue == queue &&
 269                              local->queue_stop_reasons[ac_queue] == 0 &&
 270                              skb_queue_empty(&local->pending[ac_queue])))
 271                                 netif_wake_subqueue(sdata->dev, ac);
 272                 }
 273         }
 274 }
 275
 276 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 277                                    enum queue_stop_reason reason,
 278                                    bool refcounted)
 279 {
 280         struct ieee80211_local *local = hw_to_local(hw);
 281
 282         trace_wake_queue(local, queue, reason);
 283
 284         if (WARN_ON(queue >= hw->queues))
 285                 return;
 286
 287         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 288                 return;
 289
 290         if (!refcounted) {
 291                 local->q_stop_reasons[queue][reason] = 0;
 292         } else {
 293                 local->q_stop_reasons[queue][reason]--;
 294                 if (WARN_ON(local->q_stop_reasons[queue][reason] < 0))
 295                         local->q_stop_reasons[queue][reason] = 0;
 296         }
 297
 298         if (local->q_stop_reasons[queue][reason] == 0)
 299                 __clear_bit(reason, &local->queue_stop_reasons[queue]);
 300
 301         if (local->queue_stop_reasons[queue] != 0)
 302                 /* someone still has this queue stopped */
 303                 return;
 304
 305         if (skb_queue_empty(&local->pending[queue])) {
 306                 rcu_read_lock();
 307                 ieee80211_propagate_queue_wake(local, queue);
 308                 rcu_read_unlock();
 309         } else
 310                 tasklet_schedule(&local->tx_pending_tasklet);
 311 }
 312
 313 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 314                                     enum queue_stop_reason reason,
 315                                     bool refcounted)
 316 {
 317         struct ieee80211_local *local = hw_to_local(hw);
 318         unsigned long flags;
 319
 320         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 321         __ieee80211_wake_queue(hw, queue, reason, refcounted);
 322         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 323 }
 324
 325 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 326 {
 327         ieee80211_wake_queue_by_reason(hw, queue,
 328                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 329                                        false);
 330 }
 331 EXPORT_SYMBOL(ieee80211_wake_queue);
 332
 333 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 334                                    enum queue_stop_reason reason,
 335                                    bool refcounted)
 336 {
 337         struct ieee80211_local *local = hw_to_local(hw);
 338         struct ieee80211_sub_if_data *sdata;
 339         int n_acs = IEEE80211_NUM_ACS;
 340
 341         trace_stop_queue(local, queue, reason);
 342
 343         if (WARN_ON(queue >= hw->queues))
 344                 return;
 345
 346         if (!refcounted)
 347                 local->q_stop_reasons[queue][reason] = 1;
 348         else
 349                 local->q_stop_reasons[queue][reason]++;
 350
 351         if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
 352                 return;
 353
 354         if (local->ops->wake_tx_queue)
 355                 return;
 356
 357         if (local->hw.queues < IEEE80211_NUM_ACS)
 358                 n_acs = 1;
 359
 360         rcu_read_lock();
 361         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 362                 int ac;
 363
 364                 if (!sdata->dev)
 365                         continue;
 366
 367                 for (ac = 0; ac < n_acs; ac++) {
 368                         if (sdata->vif.hw_queue[ac] == queue ||
 369                             sdata->vif.cab_queue == queue)
 370                                 netif_stop_subqueue(sdata->dev, ac);
 371                 }
 372         }
 373         rcu_read_unlock();
 374 }
 375
 376 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 377                                     enum queue_stop_reason reason,
 378                                     bool refcounted)
 379 {
 380         struct ieee80211_local *local = hw_to_local(hw);
 381         unsigned long flags;
 382
 383         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 384         __ieee80211_stop_queue(hw, queue, reason, refcounted);
 385         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 386 }
 387
 388 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 389 {
 390         ieee80211_stop_queue_by_reason(hw, queue,
 391                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 392                                        false);
 393 }
 394 EXPORT_SYMBOL(ieee80211_stop_queue);
 395
 396 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 397                                struct sk_buff *skb)
 398 {
 399         struct ieee80211_hw *hw = &local->hw;
 400         unsigned long flags;
 401         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 402         int queue = info->hw_queue;
 403
 404         if (WARN_ON(!info->control.vif)) {
 405                 ieee80211_free_txskb(&local->hw, skb);
 406                 return;
 407         }
 408
 409         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 410         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 411                                false);
 412         __skb_queue_tail(&local->pending[queue], skb);
 413         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 414                                false);
 415         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 416 }
 417
 418 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 419                                 struct sk_buff_head *skbs)
 420 {
 421         struct ieee80211_hw *hw = &local->hw;
 422         struct sk_buff *skb;
 423         unsigned long flags;
 424         int queue, i;
 425
 426         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 427         while ((skb = skb_dequeue(skbs))) {
 428                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 429
 430                 if (WARN_ON(!info->control.vif)) {
 431                         ieee80211_free_txskb(&local->hw, skb);
 432                         continue;
 433                 }
 434
 435                 queue = info->hw_queue;
 436
 437                 __ieee80211_stop_queue(hw, queue,
 438                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 439                                 false);
 440
 441                 __skb_queue_tail(&local->pending[queue], skb);
 442         }
 443
 444         for (i = 0; i < hw->queues; i++)
 445                 __ieee80211_wake_queue(hw, i,
 446                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 447                         false);
 448         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 449 }
 450
 451 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 452                                      unsigned long queues,
 453                                      enum queue_stop_reason reason,
 454                                      bool refcounted)
 455 {
 456         struct ieee80211_local *local = hw_to_local(hw);
 457         unsigned long flags;
 458         int i;
 459
 460         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 461
 462         for_each_set_bit(i, &queues, hw->queues)
 463                 __ieee80211_stop_queue(hw, i, reason, refcounted);
 464
 465         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 466 }
 467
 468 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 469 {
 470         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 471                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 472                                         false);
 473 }
 474 EXPORT_SYMBOL(ieee80211_stop_queues);
 475
 476 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 477 {
 478         struct ieee80211_local *local = hw_to_local(hw);
 479         unsigned long flags;
 480         int ret;
 481
 482         if (WARN_ON(queue >= hw->queues))
 483                 return true;
 484
 485         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 486         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 487                        &local->queue_stop_reasons[queue]);
 488         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 489         return ret;
 490 }
 491 EXPORT_SYMBOL(ieee80211_queue_stopped);
 492
 493 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 494                                      unsigned long queues,
 495                                      enum queue_stop_reason reason,
 496                                      bool refcounted)
 497 {
 498         struct ieee80211_local *local = hw_to_local(hw);
 499         unsigned long flags;
 500         int i;
 501
 502         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 503
 504         for_each_set_bit(i, &queues, hw->queues)
 505                 __ieee80211_wake_queue(hw, i, reason, refcounted);
 506
 507         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 508 }
 509
 510 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 511 {
 512         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 513                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 514                                         false);
 515 }
 516 EXPORT_SYMBOL(ieee80211_wake_queues);
 517
 518 static unsigned int
 519 ieee80211_get_vif_queues(struct ieee80211_local *local,
 520                          struct ieee80211_sub_if_data *sdata)
 521 {
 522         unsigned int queues;
 523
 524         if (sdata && ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
 525                 int ac;
 526
 527                 queues = 0;
 528
 529                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 530                         queues |= BIT(sdata->vif.hw_queue[ac]);
 531                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 532                         queues |= BIT(sdata->vif.cab_queue);
 533         } else {
 534                 /* all queues */
 535                 queues = BIT(local->hw.queues) - 1;
 536         }
 537
 538         return queues;
 539 }
 540
 541 void __ieee80211_flush_queues(struct ieee80211_local *local,
 542                               struct ieee80211_sub_if_data *sdata,
 543                               unsigned int queues, bool drop)
 544 {
 545         if (!local->ops->flush)
 546                 return;
 547
 548         /*
 549          * If no queue was set, or if the HW doesn't support
 550          * IEEE80211_HW_QUEUE_CONTROL - flush all queues
 551          */
 552         if (!queues || !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 553                 queues = ieee80211_get_vif_queues(local, sdata);
 554
 555         ieee80211_stop_queues_by_reason(&local->hw, queues,
 556                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 557                                         false);
 558
 559         drv_flush(local, sdata, queues, drop);
 560
 561         ieee80211_wake_queues_by_reason(&local->hw, queues,
 562                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 563                                         false);
 564 }
 565
 566 void ieee80211_flush_queues(struct ieee80211_local *local,
 567                             struct ieee80211_sub_if_data *sdata, bool drop)
 568 {
 569         __ieee80211_flush_queues(local, sdata, 0, drop);
 570 }
 571
 572 void ieee80211_stop_vif_queues(struct ieee80211_local *local,
 573                                struct ieee80211_sub_if_data *sdata,
 574                                enum queue_stop_reason reason)
 575 {
 576         ieee80211_stop_queues_by_reason(&local->hw,
 577                                         ieee80211_get_vif_queues(local, sdata),
 578                                         reason, true);
 579 }
 580
 581 void ieee80211_wake_vif_queues(struct ieee80211_local *local,
 582                                struct ieee80211_sub_if_data *sdata,
 583                                enum queue_stop_reason reason)
 584 {
 585         ieee80211_wake_queues_by_reason(&local->hw,
 586                                         ieee80211_get_vif_queues(local, sdata),
 587                                         reason, true);
 588 }
 589
 590 static void __iterate_interfaces(struct ieee80211_local *local,
 591                                  u32 iter_flags,
 592                                  void (*iterator)(void *data, u8 *mac,
 593                                                   struct ieee80211_vif *vif),
 594                                  void *data)
 595 {
 596         struct ieee80211_sub_if_data *sdata;
 597         bool active_only = iter_flags & IEEE80211_IFACE_ITER_ACTIVE;
 598
 599         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 600                 switch (sdata->vif.type) {
 601                 case NL80211_IFTYPE_MONITOR:
 602                         if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 603                                 continue;
 604                         break;
 605                 case NL80211_IFTYPE_AP_VLAN:
 606                         continue;
 607                 default:
 608                         break;
 609                 }
 610                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 611                     active_only && !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 612                         continue;
 613                 if (ieee80211_sdata_running(sdata) || !active_only)
 614                         iterator(data, sdata->vif.addr,
 615                                  &sdata->vif);
 616         }
 617
 618         sdata = rcu_dereference_check(local->monitor_sdata,
 619                                       lockdep_is_held(&local->iflist_mtx) ||
 620                                       lockdep_rtnl_is_held());
 621         if (sdata &&
 622             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL || !active_only ||
 623              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 624                 iterator(data, sdata->vif.addr, &sdata->vif);
 625 }
 626
 627 void ieee80211_iterate_interfaces(
 628         struct ieee80211_hw *hw, u32 iter_flags,
 629         void (*iterator)(void *data, u8 *mac,
 630                          struct ieee80211_vif *vif),
 631         void *data)
 632 {
 633         struct ieee80211_local *local = hw_to_local(hw);
 634
 635         mutex_lock(&local->iflist_mtx);
 636         __iterate_interfaces(local, iter_flags, iterator, data);
 637         mutex_unlock(&local->iflist_mtx);
 638 }
 639 EXPORT_SYMBOL_GPL(ieee80211_iterate_interfaces);
 640
 641 void ieee80211_iterate_active_interfaces_atomic(
 642         struct ieee80211_hw *hw, u32 iter_flags,
 643         void (*iterator)(void *data, u8 *mac,
 644                          struct ieee80211_vif *vif),
 645         void *data)
 646 {
 647         struct ieee80211_local *local = hw_to_local(hw);
 648
 649         rcu_read_lock();
 650         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
 651                              iterator, data);
 652         rcu_read_unlock();
 653 }
 654 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 655
 656 void ieee80211_iterate_active_interfaces_rtnl(
 657         struct ieee80211_hw *hw, u32 iter_flags,
 658         void (*iterator)(void *data, u8 *mac,
 659                          struct ieee80211_vif *vif),
 660         void *data)
 661 {
 662         struct ieee80211_local *local = hw_to_local(hw);
 663
 664         ASSERT_RTNL();
 665
 666         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
 667                              iterator, data);
 668 }
 669 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
 670
 671 static void __iterate_stations(struct ieee80211_local *local,
 672                                void (*iterator)(void *data,
 673                                                 struct ieee80211_sta *sta),
 674                                void *data)
 675 {
 676         struct sta_info *sta;
 677
 678         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 679                 if (!sta->uploaded)
 680                         continue;
 681
 682                 iterator(data, &sta->sta);
 683         }
 684 }
 685
 686 void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
 687                         void (*iterator)(void *data,
 688                                          struct ieee80211_sta *sta),
 689                         void *data)
 690 {
 691         struct ieee80211_local *local = hw_to_local(hw);
 692
 693         rcu_read_lock();
 694         __iterate_stations(local, iterator, data);
 695         rcu_read_unlock();
 696 }
 697 EXPORT_SYMBOL_GPL(ieee80211_iterate_stations_atomic);
 698
 699 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
 700 {
 701         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 702
 703         if (!ieee80211_sdata_running(sdata) ||
 704             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 705                 return NULL;
 706         return &sdata->vif;
 707 }
 708 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
 709
 710 struct wireless_dev *ieee80211_vif_to_wdev(struct ieee80211_vif *vif)
 711 {
 712         struct ieee80211_sub_if_data *sdata;
 713
 714         if (!vif)
 715                 return NULL;
 716
 717         sdata = vif_to_sdata(vif);
 718
 719         if (!ieee80211_sdata_running(sdata) ||
 720             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 721                 return NULL;
 722
 723         return &sdata->wdev;
 724 }
 725 EXPORT_SYMBOL_GPL(ieee80211_vif_to_wdev);
 726
 727 /*
 728  * Nothing should have been stuffed into the workqueue during
 729  * the suspend->resume cycle. Since we can't check each caller
 730  * of this function if we are already quiescing / suspended,
 731  * check here and don't WARN since this can actually happen when
 732  * the rx path (for example) is racing against __ieee80211_suspend
 733  * and suspending / quiescing was set after the rx path checked
 734  * them.
 735  */
 736 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 737 {
 738         if (local->quiescing || (local->suspended && !local->resuming)) {
 739                 pr_warn("queueing ieee80211 work while going to suspend\n");
 740                 return false;
 741         }
 742
 743         return true;
 744 }
 745
 746 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 747 {
 748         struct ieee80211_local *local = hw_to_local(hw);
 749
 750         if (!ieee80211_can_queue_work(local))
 751                 return;
 752
 753         queue_work(local->workqueue, work);
 754 }
 755 EXPORT_SYMBOL(ieee80211_queue_work);
 756
 757 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 758                                   struct delayed_work *dwork,
 759                                   unsigned long delay)
 760 {
 761         struct ieee80211_local *local = hw_to_local(hw);
 762
 763         if (!ieee80211_can_queue_work(local))
 764                 return;
 765
 766         queue_delayed_work(local->workqueue, dwork, delay);
 767 }
 768 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 769
 770 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 771                                struct ieee802_11_elems *elems,
 772                                u64 filter, u32 crc)
 773 {
 774         size_t left = len;
 775         const u8 *pos = start;
 776         bool calc_crc = filter != 0;
 777         DECLARE_BITMAP(seen_elems, 256);
 778         const u8 *ie;
 779
 780         bitmap_zero(seen_elems, 256);
 781         memset(elems, 0, sizeof(*elems));
 782         elems->ie_start = start;
 783         elems->total_len = len;
 784
 785         while (left >= 2) {
 786                 u8 id, elen;
 787                 bool elem_parse_failed;
 788
 789                 id = *pos++;
 790                 elen = *pos++;
 791                 left -= 2;
 792
 793                 if (elen > left) {
 794                         elems->parse_error = true;
 795                         break;
 796                 }
 797
 798                 switch (id) {
 799                 case WLAN_EID_SSID:
 800                 case WLAN_EID_SUPP_RATES:
 801                 case WLAN_EID_FH_PARAMS:
 802                 case WLAN_EID_DS_PARAMS:
 803                 case WLAN_EID_CF_PARAMS:
 804                 case WLAN_EID_TIM:
 805                 case WLAN_EID_IBSS_PARAMS:
 806                 case WLAN_EID_CHALLENGE:
 807                 case WLAN_EID_RSN:
 808                 case WLAN_EID_ERP_INFO:
 809                 case WLAN_EID_EXT_SUPP_RATES:
 810                 case WLAN_EID_HT_CAPABILITY:
 811                 case WLAN_EID_HT_OPERATION:
 812                 case WLAN_EID_VHT_CAPABILITY:
 813                 case WLAN_EID_VHT_OPERATION:
 814                 case WLAN_EID_MESH_ID:
 815                 case WLAN_EID_MESH_CONFIG:
 816                 case WLAN_EID_PEER_MGMT:
 817                 case WLAN_EID_PREQ:
 818                 case WLAN_EID_PREP:
 819                 case WLAN_EID_PERR:
 820                 case WLAN_EID_RANN:
 821                 case WLAN_EID_CHANNEL_SWITCH:
 822                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 823                 case WLAN_EID_COUNTRY:
 824                 case WLAN_EID_PWR_CONSTRAINT:
 825                 case WLAN_EID_TIMEOUT_INTERVAL:
 826                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 827                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 828                 case WLAN_EID_CHAN_SWITCH_PARAM:
 829                 case WLAN_EID_EXT_CAPABILITY:
 830                 case WLAN_EID_CHAN_SWITCH_TIMING:
 831                 case WLAN_EID_LINK_ID:
 832                 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
 833                 /*
 834                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 835                  * that if the content gets bigger it might be needed more than once
 836                  */
 837                         if (test_bit(id, seen_elems)) {
 838                                 elems->parse_error = true;
 839                                 left -= elen;
 840                                 pos += elen;
 841                                 continue;
 842                         }
 843                         break;
 844                 }
 845
 846                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 847                         crc = crc32_be(crc, pos - 2, elen + 2);
 848
 849                 elem_parse_failed = false;
 850
 851                 switch (id) {
 852                 case WLAN_EID_LINK_ID:
 853                         if (elen + 2 != sizeof(struct ieee80211_tdls_lnkie)) {
 854                                 elem_parse_failed = true;
 855                                 break;
 856                         }
 857                         elems->lnk_id = (void *)(pos - 2);
 858                         break;
 859                 case WLAN_EID_CHAN_SWITCH_TIMING:
 860                         if (elen != sizeof(struct ieee80211_ch_switch_timing)) {
 861                                 elem_parse_failed = true;
 862                                 break;
 863                         }
 864                         elems->ch_sw_timing = (void *)pos;
 865                         break;
 866                 case WLAN_EID_EXT_CAPABILITY:
 867                         elems->ext_capab = pos;
 868                         elems->ext_capab_len = elen;
 869                         break;
 870                 case WLAN_EID_SSID:
 871                         elems->ssid = pos;
 872                         elems->ssid_len = elen;
 873                         break;
 874                 case WLAN_EID_SUPP_RATES:
 875                         elems->supp_rates = pos;
 876                         elems->supp_rates_len = elen;
 877                         break;
 878                 case WLAN_EID_DS_PARAMS:
 879                         if (elen >= 1)
 880                                 elems->ds_params = pos;
 881                         else
 882                                 elem_parse_failed = true;
 883                         break;
 884                 case WLAN_EID_TIM:
 885                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 886                                 elems->tim = (void *)pos;
 887                                 elems->tim_len = elen;
 888                         } else
 889                                 elem_parse_failed = true;
 890                         break;
 891                 case WLAN_EID_CHALLENGE:
 892                         elems->challenge = pos;
 893                         elems->challenge_len = elen;
 894                         break;
 895                 case WLAN_EID_VENDOR_SPECIFIC:
 896                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 897                             pos[2] == 0xf2) {
 898                                 /* Microsoft OUI (00:50:F2) */
 899
 900                                 if (calc_crc)
 901                                         crc = crc32_be(crc, pos - 2, elen + 2);
 902
 903                                 if (elen >= 5 && pos[3] == 2) {
 904                                         /* OUI Type 2 - WMM IE */
 905                                         if (pos[4] == 0) {
 906                                                 elems->wmm_info = pos;
 907                                                 elems->wmm_info_len = elen;
 908                                         } else if (pos[4] == 1) {
 909                                                 elems->wmm_param = pos;
 910                                                 elems->wmm_param_len = elen;
 911                                         }
 912                                 }
 913                         }
 914                         break;
 915                 case WLAN_EID_RSN:
 916                         elems->rsn = pos;
 917                         elems->rsn_len = elen;
 918                         break;
 919                 case WLAN_EID_ERP_INFO:
 920                         if (elen >= 1)
 921                                 elems->erp_info = pos;
 922                         else
 923                                 elem_parse_failed = true;
 924                         break;
 925                 case WLAN_EID_EXT_SUPP_RATES:
 926                         elems->ext_supp_rates = pos;
 927                         elems->ext_supp_rates_len = elen;
 928                         break;
 929                 case WLAN_EID_HT_CAPABILITY:
 930                         if (elen >= sizeof(struct ieee80211_ht_cap))
 931                                 elems->ht_cap_elem = (void *)pos;
 932                         else
 933                                 elem_parse_failed = true;
 934                         break;
 935                 case WLAN_EID_HT_OPERATION:
 936                         if (elen >= sizeof(struct ieee80211_ht_operation))
 937                                 elems->ht_operation = (void *)pos;
 938                         else
 939                                 elem_parse_failed = true;
 940                         break;
 941                 case WLAN_EID_VHT_CAPABILITY:
 942                         if (elen >= sizeof(struct ieee80211_vht_cap))
 943                                 elems->vht_cap_elem = (void *)pos;
 944                         else
 945                                 elem_parse_failed = true;
 946                         break;
 947                 case WLAN_EID_VHT_OPERATION:
 948                         if (elen >= sizeof(struct ieee80211_vht_operation))
 949                                 elems->vht_operation = (void *)pos;
 950                         else
 951                                 elem_parse_failed = true;
 952                         break;
 953                 case WLAN_EID_OPMODE_NOTIF:
 954                         if (elen > 0)
 955                                 elems->opmode_notif = pos;
 956                         else
 957                                 elem_parse_failed = true;
 958                         break;
 959                 case WLAN_EID_MESH_ID:
 960                         elems->mesh_id = pos;
 961                         elems->mesh_id_len = elen;
 962                         break;
 963                 case WLAN_EID_MESH_CONFIG:
 964                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 965                                 elems->mesh_config = (void *)pos;
 966                         else
 967                                 elem_parse_failed = true;
 968                         break;
 969                 case WLAN_EID_PEER_MGMT:
 970                         elems->peering = pos;
 971                         elems->peering_len = elen;
 972                         break;
 973                 case WLAN_EID_MESH_AWAKE_WINDOW:
 974                         if (elen >= 2)
 975                                 elems->awake_window = (void *)pos;
 976                         break;
 977                 case WLAN_EID_PREQ:
 978                         elems->preq = pos;
 979                         elems->preq_len = elen;
 980                         break;
 981                 case WLAN_EID_PREP:
 982                         elems->prep = pos;
 983                         elems->prep_len = elen;
 984                         break;
 985                 case WLAN_EID_PERR:
 986                         elems->perr = pos;
 987                         elems->perr_len = elen;
 988                         break;
 989                 case WLAN_EID_RANN:
 990                         if (elen >= sizeof(struct ieee80211_rann_ie))
 991                                 elems->rann = (void *)pos;
 992                         else
 993                                 elem_parse_failed = true;
 994                         break;
 995                 case WLAN_EID_CHANNEL_SWITCH:
 996                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 997                                 elem_parse_failed = true;
 998                                 break;
 999                         }
1000                         elems->ch_switch_ie = (void *)pos;
1001                         break;
1002                 case WLAN_EID_EXT_CHANSWITCH_ANN:
1003                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
1004                                 elem_parse_failed = true;
1005                                 break;
1006                         }
1007                         elems->ext_chansw_ie = (void *)pos;
1008                         break;
1009                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
1010                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
1011                                 elem_parse_failed = true;
1012                                 break;
1013                         }
1014                         elems->sec_chan_offs = (void *)pos;
1015                         break;
1016                 case WLAN_EID_CHAN_SWITCH_PARAM:
1017                         if (elen !=
1018                             sizeof(*elems->mesh_chansw_params_ie)) {
1019                                 elem_parse_failed = true;
1020                                 break;
1021                         }
1022                         elems->mesh_chansw_params_ie = (void *)pos;
1023                         break;
1024                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
1025                         if (!action ||
1026                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
1027                                 elem_parse_failed = true;
1028                                 break;
1029                         }
1030                         elems->wide_bw_chansw_ie = (void *)pos;
1031                         break;
1032                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
1033                         if (action) {
1034                                 elem_parse_failed = true;
1035                                 break;
1036                         }
1037                         /*
1038                          * This is a bit tricky, but as we only care about
1039                          * the wide bandwidth channel switch element, so
1040                          * just parse it out manually.
1041                          */
1042                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
1043                                               pos, elen);
1044                         if (ie) {
1045                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
1046                                         elems->wide_bw_chansw_ie =
1047                                                 (void *)(ie + 2);
1048                                 else
1049                                         elem_parse_failed = true;
1050                         }
1051                         break;
1052                 case WLAN_EID_COUNTRY:
1053                         elems->country_elem = pos;
1054                         elems->country_elem_len = elen;
1055                         break;
1056                 case WLAN_EID_PWR_CONSTRAINT:
1057                         if (elen != 1) {
1058                                 elem_parse_failed = true;
1059                                 break;
1060                         }
1061                         elems->pwr_constr_elem = pos;
1062                         break;
1063                 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
1064                         /* Lots of different options exist, but we only care
1065                          * about the Dynamic Transmit Power Control element.
1066                          * First check for the Cisco OUI, then for the DTPC
1067                          * tag (0x00).
1068                          */
1069                         if (elen < 4) {
1070                                 elem_parse_failed = true;
1071                                 break;
1072                         }
1073
1074                         if (pos[0] != 0x00 || pos[1] != 0x40 ||
1075                             pos[2] != 0x96 || pos[3] != 0x00)
1076                                 break;
1077
1078                         if (elen != 6) {
1079                                 elem_parse_failed = true;
1080                                 break;
1081                         }
1082
1083                         if (calc_crc)
1084                                 crc = crc32_be(crc, pos - 2, elen + 2);
1085
1086                         elems->cisco_dtpc_elem = pos;
1087                         break;
1088                 case WLAN_EID_TIMEOUT_INTERVAL:
1089                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
1090                                 elems->timeout_int = (void *)pos;
1091                         else
1092                                 elem_parse_failed = true;
1093                         break;
1094                 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
1095                         if (elen >= sizeof(*elems->max_idle_period_ie))
1096                                 elems->max_idle_period_ie = (void *)pos;
1097                         break;
1098                 case WLAN_EID_EXTENSION:
1099                         if (pos[0] == WLAN_EID_EXT_HE_MU_EDCA &&
1100                             elen >= (sizeof(*elems->mu_edca_param_set) + 1)) {
1101                                 elems->mu_edca_param_set = (void *)&pos[1];
1102                         } else if (pos[0] == WLAN_EID_EXT_HE_CAPABILITY) {
1103                                 elems->he_cap = (void *)&pos[1];
1104                                 elems->he_cap_len = elen - 1;
1105                         } else if (pos[0] == WLAN_EID_EXT_HE_OPERATION &&
1106                                    elen >= sizeof(*elems->he_operation) &&
1107                                    elen >= ieee80211_he_oper_size(&pos[1])) {
1108                                 elems->he_operation = (void *)&pos[1];
1109                         } else if (pos[0] == WLAN_EID_EXT_UORA && elen >= 1) {
1110                                 elems->uora_element = (void *)&pos[1];
1111                         }
1112                         break;
1113                 default:
1114                         break;
1115                 }
1116
1117                 if (elem_parse_failed)
1118                         elems->parse_error = true;
1119                 else
1120                         __set_bit(id, seen_elems);
1121
1122                 left -= elen;
1123                 pos += elen;
1124         }
1125
1126         if (left != 0)
1127                 elems->parse_error = true;
1128
1129         return crc;
1130 }
1131
1132 void ieee80211_regulatory_limit_wmm_params(struct ieee80211_sub_if_data *sdata,
1133                                            struct ieee80211_tx_queue_params
1134                                            *qparam, int ac)
1135 {
1136         struct ieee80211_chanctx_conf *chanctx_conf;
1137         const struct ieee80211_reg_rule *rrule;
1138         struct ieee80211_wmm_ac *wmm_ac;
1139         u16 center_freq = 0;
1140
1141         if (sdata->vif.type != NL80211_IFTYPE_AP &&
1142             sdata->vif.type != NL80211_IFTYPE_STATION)
1143                 return;
1144
1145         rcu_read_lock();
1146         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1147         if (chanctx_conf)
1148                 center_freq = chanctx_conf->def.chan->center_freq;
1149
1150         if (!center_freq) {
1151                 rcu_read_unlock();
1152                 return;
1153         }
1154
1155         rrule = freq_reg_info(sdata->wdev.wiphy, MHZ_TO_KHZ(center_freq));
1156
1157         if (IS_ERR_OR_NULL(rrule) || !rrule->wmm_rule) {
1158                 rcu_read_unlock();
1159                 return;
1160         }
1161
1162         if (sdata->vif.type == NL80211_IFTYPE_AP)
1163                 wmm_ac = &rrule->wmm_rule->ap[ac];
1164         else
1165                 wmm_ac = &rrule->wmm_rule->client[ac];
1166         qparam->cw_min = max_t(u16, qparam->cw_min, wmm_ac->cw_min);
1167         qparam->cw_max = max_t(u16, qparam->cw_max, wmm_ac->cw_max);
1168         qparam->aifs = max_t(u8, qparam->aifs, wmm_ac->aifsn);
1169         qparam->txop = !qparam->txop ? wmm_ac->cot / 32 :
1170                 min_t(u16, qparam->txop, wmm_ac->cot / 32);
1171         rcu_read_unlock();
1172 }
1173
1174 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
1175                                bool bss_notify, bool enable_qos)
1176 {
1177         struct ieee80211_local *local = sdata->local;
1178         struct ieee80211_tx_queue_params qparam;
1179         struct ieee80211_chanctx_conf *chanctx_conf;
1180         int ac;
1181         bool use_11b;
1182         bool is_ocb; /* Use another EDCA parameters if dot11OCBActivated=true */
1183         int aCWmin, aCWmax;
1184
1185         if (!local->ops->conf_tx)
1186                 return;
1187
1188         if (local->hw.queues < IEEE80211_NUM_ACS)
1189                 return;
1190
1191         memset(&qparam, 0, sizeof(qparam));
1192
1193         rcu_read_lock();
1194         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1195         use_11b = (chanctx_conf &&
1196                    chanctx_conf->def.chan->band == NL80211_BAND_2GHZ) &&
1197                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1198         rcu_read_unlock();
1199
1200         is_ocb = (sdata->vif.type == NL80211_IFTYPE_OCB);
1201
1202         /* Set defaults according to 802.11-2007 Table 7-37 */
1203         aCWmax = 1023;
1204         if (use_11b)
1205                 aCWmin = 31;
1206         else
1207                 aCWmin = 15;
1208
1209         /* Confiure old 802.11b/g medium access rules. */
1210         qparam.cw_max = aCWmax;
1211         qparam.cw_min = aCWmin;
1212         qparam.txop = 0;
1213         qparam.aifs = 2;
1214
1215         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1216                 /* Update if QoS is enabled. */
1217                 if (enable_qos) {
1218                         switch (ac) {
1219                         case IEEE80211_AC_BK:
1220                                 qparam.cw_max = aCWmax;
1221                                 qparam.cw_min = aCWmin;
1222                                 qparam.txop = 0;
1223                                 if (is_ocb)
1224                                         qparam.aifs = 9;
1225                                 else
1226                                         qparam.aifs = 7;
1227                                 break;
1228                         /* never happens but let's not leave undefined */
1229                         default:
1230                         case IEEE80211_AC_BE:
1231                                 qparam.cw_max = aCWmax;
1232                                 qparam.cw_min = aCWmin;
1233                                 qparam.txop = 0;
1234                                 if (is_ocb)
1235                                         qparam.aifs = 6;
1236                                 else
1237                                         qparam.aifs = 3;
1238                                 break;
1239                         case IEEE80211_AC_VI:
1240                                 qparam.cw_max = aCWmin;
1241                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1242                                 if (is_ocb)
1243                                         qparam.txop = 0;
1244                                 else if (use_11b)
1245                                         qparam.txop = 6016/32;
1246                                 else
1247                                         qparam.txop = 3008/32;
1248
1249                                 if (is_ocb)
1250                                         qparam.aifs = 3;
1251                                 else
1252                                         qparam.aifs = 2;
1253                                 break;
1254                         case IEEE80211_AC_VO:
1255                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1256                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1257                                 if (is_ocb)
1258                                         qparam.txop = 0;
1259                                 else if (use_11b)
1260                                         qparam.txop = 3264/32;
1261                                 else
1262                                         qparam.txop = 1504/32;
1263                                 qparam.aifs = 2;
1264                                 break;
1265                         }
1266                 }
1267                 ieee80211_regulatory_limit_wmm_params(sdata, &qparam, ac);
1268
1269                 qparam.uapsd = false;
1270
1271                 sdata->tx_conf[ac] = qparam;
1272                 drv_conf_tx(local, sdata, ac, &qparam);
1273         }
1274
1275         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1276             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1277             sdata->vif.type != NL80211_IFTYPE_NAN) {
1278                 sdata->vif.bss_conf.qos = enable_qos;
1279                 if (bss_notify)
1280                         ieee80211_bss_info_change_notify(sdata,
1281                                                          BSS_CHANGED_QOS);
1282         }
1283 }
1284
1285 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1286                          u16 transaction, u16 auth_alg, u16 status,
1287                          const u8 *extra, size_t extra_len, const u8 *da,
1288                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1289                          u32 tx_flags)
1290 {
1291         struct ieee80211_local *local = sdata->local;
1292         struct sk_buff *skb;
1293         struct ieee80211_mgmt *mgmt;
1294         int err;
1295
1296         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1297         skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
1298                             24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
1299         if (!skb)
1300                 return;
1301
1302         skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
1303
1304         mgmt = skb_put_zero(skb, 24 + 6);
1305         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1306                                           IEEE80211_STYPE_AUTH);
1307         memcpy(mgmt->da, da, ETH_ALEN);
1308         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1309         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1310         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1311         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1312         mgmt->u.auth.status_code = cpu_to_le16(status);
1313         if (extra)
1314                 skb_put_data(skb, extra, extra_len);
1315
1316         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1317                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1318                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1319                 WARN_ON(err);
1320         }
1321
1322         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1323                                         tx_flags;
1324         ieee80211_tx_skb(sdata, skb);
1325 }
1326
1327 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1328                                     const u8 *bssid, u16 stype, u16 reason,
1329                                     bool send_frame, u8 *frame_buf)
1330 {
1331         struct ieee80211_local *local = sdata->local;
1332         struct sk_buff *skb;
1333         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1334
1335         /* build frame */
1336         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1337         mgmt->duration = 0; /* initialize only */
1338         mgmt->seq_ctrl = 0; /* initialize only */
1339         memcpy(mgmt->da, bssid, ETH_ALEN);
1340         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1341         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1342         /* u.deauth.reason_code == u.disassoc.reason_code */
1343         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1344
1345         if (send_frame) {
1346                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1347                                     IEEE80211_DEAUTH_FRAME_LEN);
1348                 if (!skb)
1349                         return;
1350
1351                 skb_reserve(skb, local->hw.extra_tx_headroom);
1352
1353                 /* copy in frame */
1354                 skb_put_data(skb, mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1355
1356                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1357                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1358                         IEEE80211_SKB_CB(skb)->flags |=
1359                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1360
1361                 ieee80211_tx_skb(sdata, skb);
1362         }
1363 }
1364
1365 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
1366                                          u8 *buffer, size_t buffer_len,
1367                                          const u8 *ie, size_t ie_len,
1368                                          enum nl80211_band band,
1369                                          u32 rate_mask,
1370                                          struct cfg80211_chan_def *chandef,
1371                                          size_t *offset, u32 flags)
1372 {
1373         struct ieee80211_supported_band *sband;
1374         const struct ieee80211_sta_he_cap *he_cap;
1375         u8 *pos = buffer, *end = buffer + buffer_len;
1376         size_t noffset;
1377         int supp_rates_len, i;
1378         u8 rates[32];
1379         int num_rates;
1380         int ext_rates_len;
1381         int shift;
1382         u32 rate_flags;
1383         bool have_80mhz = false;
1384
1385         *offset = 0;
1386
1387         sband = local->hw.wiphy->bands[band];
1388         if (WARN_ON_ONCE(!sband))
1389                 return 0;
1390
1391         rate_flags = ieee80211_chandef_rate_flags(chandef);
1392         shift = ieee80211_chandef_get_shift(chandef);
1393
1394         num_rates = 0;
1395         for (i = 0; i < sband->n_bitrates; i++) {
1396                 if ((BIT(i) & rate_mask) == 0)
1397                         continue; /* skip rate */
1398                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1399                         continue;
1400
1401                 rates[num_rates++] =
1402                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1403                                           (1 << shift) * 5);
1404         }
1405
1406         supp_rates_len = min_t(int, num_rates, 8);
1407
1408         if (end - pos < 2 + supp_rates_len)
1409                 goto out_err;
1410         *pos++ = WLAN_EID_SUPP_RATES;
1411         *pos++ = supp_rates_len;
1412         memcpy(pos, rates, supp_rates_len);
1413         pos += supp_rates_len;
1414
1415         /* insert "request information" if in custom IEs */
1416         if (ie && ie_len) {
1417                 static const u8 before_extrates[] = {
1418                         WLAN_EID_SSID,
1419                         WLAN_EID_SUPP_RATES,
1420                         WLAN_EID_REQUEST,
1421                 };
1422                 noffset = ieee80211_ie_split(ie, ie_len,
1423                                              before_extrates,
1424                                              ARRAY_SIZE(before_extrates),
1425                                              *offset);
1426                 if (end - pos < noffset - *offset)
1427                         goto out_err;
1428                 memcpy(pos, ie + *offset, noffset - *offset);
1429                 pos += noffset - *offset;
1430                 *offset = noffset;
1431         }
1432
1433         ext_rates_len = num_rates - supp_rates_len;
1434         if (ext_rates_len > 0) {
1435                 if (end - pos < 2 + ext_rates_len)
1436                         goto out_err;
1437                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1438                 *pos++ = ext_rates_len;
1439                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1440                 pos += ext_rates_len;
1441         }
1442
1443         if (chandef->chan && sband->band == NL80211_BAND_2GHZ) {
1444                 if (end - pos < 3)
1445                         goto out_err;
1446                 *pos++ = WLAN_EID_DS_PARAMS;
1447                 *pos++ = 1;
1448                 *pos++ = ieee80211_frequency_to_channel(
1449                                 chandef->chan->center_freq);
1450         }
1451
1452         if (flags & IEEE80211_PROBE_FLAG_MIN_CONTENT)
1453                 goto done;
1454
1455         /* insert custom IEs that go before HT */
1456         if (ie && ie_len) {
1457                 static const u8 before_ht[] = {
1458                         /*
1459                          * no need to list the ones split off already
1460                          * (or generated here)
1461                          */
1462                         WLAN_EID_DS_PARAMS,
1463                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1464                 };
1465                 noffset = ieee80211_ie_split(ie, ie_len,
1466                                              before_ht, ARRAY_SIZE(before_ht),
1467                                              *offset);
1468                 if (end - pos < noffset - *offset)
1469                         goto out_err;
1470                 memcpy(pos, ie + *offset, noffset - *offset);
1471                 pos += noffset - *offset;
1472                 *offset = noffset;
1473         }
1474
1475         if (sband->ht_cap.ht_supported) {
1476                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1477                         goto out_err;
1478                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1479                                                 sband->ht_cap.cap);
1480         }
1481
1482         /* insert custom IEs that go before VHT */
1483         if (ie && ie_len) {
1484                 static const u8 before_vht[] = {
1485                         /*
1486                          * no need to list the ones split off already
1487                          * (or generated here)
1488                          */
1489                         WLAN_EID_BSS_COEX_2040,
1490                         WLAN_EID_EXT_CAPABILITY,
1491                         WLAN_EID_SSID_LIST,
1492                         WLAN_EID_CHANNEL_USAGE,
1493                         WLAN_EID_INTERWORKING,
1494                         WLAN_EID_MESH_ID,
1495                         /* 60 GHz (Multi-band, DMG, MMS) can't happen */
1496                 };
1497                 noffset = ieee80211_ie_split(ie, ie_len,
1498                                              before_vht, ARRAY_SIZE(before_vht),
1499                                              *offset);
1500                 if (end - pos < noffset - *offset)
1501                         goto out_err;
1502                 memcpy(pos, ie + *offset, noffset - *offset);
1503                 pos += noffset - *offset;
1504                 *offset = noffset;
1505         }
1506
1507         /* Check if any channel in this sband supports at least 80 MHz */
1508         for (i = 0; i < sband->n_channels; i++) {
1509                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
1510                                                 IEEE80211_CHAN_NO_80MHZ))
1511                         continue;
1512
1513                 have_80mhz = true;
1514                 break;
1515         }
1516
1517         if (sband->vht_cap.vht_supported && have_80mhz) {
1518                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1519                         goto out_err;
1520                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1521                                                  sband->vht_cap.cap);
1522         }
1523
1524         /* insert custom IEs that go before HE */
1525         if (ie && ie_len) {
1526                 static const u8 before_he[] = {
1527                         /*
1528                          * no need to list the ones split off before VHT
1529                          * or generated here
1530                          */
1531                         WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_REQ_PARAMS,
1532                         WLAN_EID_AP_CSN,
1533                         /* TODO: add 11ah/11aj/11ak elements */
1534                 };
1535                 noffset = ieee80211_ie_split(ie, ie_len,
1536                                              before_he, ARRAY_SIZE(before_he),
1537                                              *offset);
1538                 if (end - pos < noffset - *offset)
1539                         goto out_err;
1540                 memcpy(pos, ie + *offset, noffset - *offset);
1541                 pos += noffset - *offset;
1542                 *offset = noffset;
1543         }
1544
1545         he_cap = ieee80211_get_he_sta_cap(sband);
1546         if (he_cap) {
1547                 pos = ieee80211_ie_build_he_cap(pos, he_cap, end);
1548                 if (!pos)
1549                         goto out_err;
1550         }
1551
1552         /*
1553          * If adding more here, adjust code in main.c
1554          * that calculates local->scan_ies_len.
1555          */
1556
1557         return pos - buffer;
1558  out_err:
1559         WARN_ONCE(1, "not enough space for preq IEs\n");
1560  done:
1561         return pos - buffer;
1562 }
1563
1564 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1565                              size_t buffer_len,
1566                              struct ieee80211_scan_ies *ie_desc,
1567                              const u8 *ie, size_t ie_len,
1568                              u8 bands_used, u32 *rate_masks,
1569                              struct cfg80211_chan_def *chandef,
1570                              u32 flags)
1571 {
1572         size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
1573         int i;
1574
1575         memset(ie_desc, 0, sizeof(*ie_desc));
1576
1577         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1578                 if (bands_used & BIT(i)) {
1579                         pos += ieee80211_build_preq_ies_band(local,
1580                                                              buffer + pos,
1581                                                              buffer_len - pos,
1582                                                              ie, ie_len, i,
1583                                                              rate_masks[i],
1584                                                              chandef,
1585                                                              &custom_ie_offset,
1586                                                              flags);
1587                         ie_desc->ies[i] = buffer + old_pos;
1588                         ie_desc->len[i] = pos - old_pos;
1589                         old_pos = pos;
1590                 }
1591         }
1592
1593         /* add any remaining custom IEs */
1594         if (ie && ie_len) {
1595                 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
1596                               "not enough space for preq custom IEs\n"))
1597                         return pos;
1598                 memcpy(buffer + pos, ie + custom_ie_offset,
1599                        ie_len - custom_ie_offset);
1600                 ie_desc->common_ies = buffer + pos;
1601                 ie_desc->common_ie_len = ie_len - custom_ie_offset;
1602                 pos += ie_len - custom_ie_offset;
1603         }
1604
1605         return pos;
1606 };
1607
1608 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1609                                           const u8 *src, const u8 *dst,
1610                                           u32 ratemask,
1611                                           struct ieee80211_channel *chan,
1612                                           const u8 *ssid, size_t ssid_len,
1613                                           const u8 *ie, size_t ie_len,
1614                                           u32 flags)
1615 {
1616         struct ieee80211_local *local = sdata->local;
1617         struct cfg80211_chan_def chandef;
1618         struct sk_buff *skb;
1619         struct ieee80211_mgmt *mgmt;
1620         int ies_len;
1621         u32 rate_masks[NUM_NL80211_BANDS] = {};
1622         struct ieee80211_scan_ies dummy_ie_desc;
1623
1624         /*
1625          * Do not send DS Channel parameter for directed probe requests
1626          * in order to maximize the chance that we get a response.  Some
1627          * badly-behaved APs don't respond when this parameter is included.
1628          */
1629         chandef.width = sdata->vif.bss_conf.chandef.width;
1630         if (flags & IEEE80211_PROBE_FLAG_DIRECTED)
1631                 chandef.chan = NULL;
1632         else
1633                 chandef.chan = chan;
1634
1635         skb = ieee80211_probereq_get(&local->hw, src, ssid, ssid_len,
1636                                      100 + ie_len);
1637         if (!skb)
1638                 return NULL;
1639
1640         rate_masks[chan->band] = ratemask;
1641         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1642                                            skb_tailroom(skb), &dummy_ie_desc,
1643                                            ie, ie_len, BIT(chan->band),
1644                                            rate_masks, &chandef, flags);
1645         skb_put(skb, ies_len);
1646
1647         if (dst) {
1648                 mgmt = (struct ieee80211_mgmt *) skb->data;
1649                 memcpy(mgmt->da, dst, ETH_ALEN);
1650                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1651         }
1652
1653         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1654
1655         return skb;
1656 }
1657
1658 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1659                             struct ieee802_11_elems *elems,
1660                             enum nl80211_band band, u32 *basic_rates)
1661 {
1662         struct ieee80211_supported_band *sband;
1663         size_t num_rates;
1664         u32 supp_rates, rate_flags;
1665         int i, j, shift;
1666
1667         sband = sdata->local->hw.wiphy->bands[band];
1668         if (WARN_ON(!sband))
1669                 return 1;
1670
1671         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1672         shift = ieee80211_vif_get_shift(&sdata->vif);
1673
1674         num_rates = sband->n_bitrates;
1675         supp_rates = 0;
1676         for (i = 0; i < elems->supp_rates_len +
1677                      elems->ext_supp_rates_len; i++) {
1678                 u8 rate = 0;
1679                 int own_rate;
1680                 bool is_basic;
1681                 if (i < elems->supp_rates_len)
1682                         rate = elems->supp_rates[i];
1683                 else if (elems->ext_supp_rates)
1684                         rate = elems->ext_supp_rates
1685                                 [i - elems->supp_rates_len];
1686                 own_rate = 5 * (rate & 0x7f);
1687                 is_basic = !!(rate & 0x80);
1688
1689                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1690                         continue;
1691
1692                 for (j = 0; j < num_rates; j++) {
1693                         int brate;
1694                         if ((rate_flags & sband->bitrates[j].flags)
1695                             != rate_flags)
1696                                 continue;
1697
1698                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1699                                              1 << shift);
1700
1701                         if (brate == own_rate) {
1702                                 supp_rates |= BIT(j);
1703                                 if (basic_rates && is_basic)
1704                                         *basic_rates |= BIT(j);
1705                         }
1706                 }
1707         }
1708         return supp_rates;
1709 }
1710
1711 void ieee80211_stop_device(struct ieee80211_local *local)
1712 {
1713         ieee80211_led_radio(local, false);
1714         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1715
1716         cancel_work_sync(&local->reconfig_filter);
1717
1718         flush_workqueue(local->workqueue);
1719         drv_stop(local);
1720 }
1721
1722 static void ieee80211_flush_completed_scan(struct ieee80211_local *local,
1723                                            bool aborted)
1724 {
1725         /* It's possible that we don't handle the scan completion in
1726          * time during suspend, so if it's still marked as completed
1727          * here, queue the work and flush it to clean things up.
1728          * Instead of calling the worker function directly here, we
1729          * really queue it to avoid potential races with other flows
1730          * scheduling the same work.
1731          */
1732         if (test_bit(SCAN_COMPLETED, &local->scanning)) {
1733                 /* If coming from reconfiguration failure, abort the scan so
1734                  * we don't attempt to continue a partial HW scan - which is
1735                  * possible otherwise if (e.g.) the 2.4 GHz portion was the
1736                  * completed scan, and a 5 GHz portion is still pending.
1737                  */
1738                 if (aborted)
1739                         set_bit(SCAN_ABORTED, &local->scanning);
1740                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
1741                 flush_delayed_work(&local->scan_work);
1742         }
1743 }
1744
1745 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1746 {
1747         struct ieee80211_sub_if_data *sdata;
1748         struct ieee80211_chanctx *ctx;
1749
1750         /*
1751          * We get here if during resume the device can't be restarted properly.
1752          * We might also get here if this happens during HW reset, which is a
1753          * slightly different situation and we need to drop all connections in
1754          * the latter case.
1755          *
1756          * Ask cfg80211 to turn off all interfaces, this will result in more
1757          * warnings but at least we'll then get into a clean stopped state.
1758          */
1759
1760         local->resuming = false;
1761         local->suspended = false;
1762         local->in_reconfig = false;
1763
1764         ieee80211_flush_completed_scan(local, true);
1765
1766         /* scheduled scan clearly can't be running any more, but tell
1767          * cfg80211 and clear local state
1768          */
1769         ieee80211_sched_scan_end(local);
1770
1771         list_for_each_entry(sdata, &local->interfaces, list)
1772                 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1773
1774         /* Mark channel contexts as not being in the driver any more to avoid
1775          * removing them from the driver during the shutdown process...
1776          */
1777         mutex_lock(&local->chanctx_mtx);
1778         list_for_each_entry(ctx, &local->chanctx_list, list)
1779                 ctx->driver_present = false;
1780         mutex_unlock(&local->chanctx_mtx);
1781
1782         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1783 }
1784
1785 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1786                                      struct ieee80211_sub_if_data *sdata)
1787 {
1788         struct ieee80211_chanctx_conf *conf;
1789         struct ieee80211_chanctx *ctx;
1790
1791         if (!local->use_chanctx)
1792                 return;
1793
1794         mutex_lock(&local->chanctx_mtx);
1795         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1796                                          lockdep_is_held(&local->chanctx_mtx));
1797         if (conf) {
1798                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1799                 drv_assign_vif_chanctx(local, sdata, ctx);
1800         }
1801         mutex_unlock(&local->chanctx_mtx);
1802 }
1803
1804 static void ieee80211_reconfig_stations(struct ieee80211_sub_if_data *sdata)
1805 {
1806         struct ieee80211_local *local = sdata->local;
1807         struct sta_info *sta;
1808
1809         /* add STAs back */
1810         mutex_lock(&local->sta_mtx);
1811         list_for_each_entry(sta, &local->sta_list, list) {
1812                 enum ieee80211_sta_state state;
1813
1814                 if (!sta->uploaded || sta->sdata != sdata)
1815                         continue;
1816
1817                 for (state = IEEE80211_STA_NOTEXIST;
1818                      state < sta->sta_state; state++)
1819                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1820                                               state + 1));
1821         }
1822         mutex_unlock(&local->sta_mtx);
1823 }
1824
1825 static int ieee80211_reconfig_nan(struct ieee80211_sub_if_data *sdata)
1826 {
1827         struct cfg80211_nan_func *func, **funcs;
1828         int res, id, i = 0;
1829
1830         res = drv_start_nan(sdata->local, sdata,
1831                             &sdata->u.nan.conf);
1832         if (WARN_ON(res))
1833                 return res;
1834
1835         funcs = kcalloc(sdata->local->hw.max_nan_de_entries + 1,
1836                         sizeof(*funcs),
1837                         GFP_KERNEL);
1838         if (!funcs)
1839                 return -ENOMEM;
1840
1841         /* Add all the functions:
1842          * This is a little bit ugly. We need to call a potentially sleeping
1843          * callback for each NAN function, so we can't hold the spinlock.
1844          */
1845         spin_lock_bh(&sdata->u.nan.func_lock);
1846
1847         idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, id)
1848                 funcs[i++] = func;
1849
1850         spin_unlock_bh(&sdata->u.nan.func_lock);
1851
1852         for (i = 0; funcs[i]; i++) {
1853                 res = drv_add_nan_func(sdata->local, sdata, funcs[i]);
1854                 if (WARN_ON(res))
1855                         ieee80211_nan_func_terminated(&sdata->vif,
1856                                                       funcs[i]->instance_id,
1857                                                       NL80211_NAN_FUNC_TERM_REASON_ERROR,
1858                                                       GFP_KERNEL);
1859         }
1860
1861         kfree(funcs);
1862
1863         return 0;
1864 }
1865
1866 int ieee80211_reconfig(struct ieee80211_local *local)
1867 {
1868         struct ieee80211_hw *hw = &local->hw;
1869         struct ieee80211_sub_if_data *sdata;
1870         struct ieee80211_chanctx *ctx;
1871         struct sta_info *sta;
1872         int res, i;
1873         bool reconfig_due_to_wowlan = false;
1874         struct ieee80211_sub_if_data *sched_scan_sdata;
1875         struct cfg80211_sched_scan_request *sched_scan_req;
1876         bool sched_scan_stopped = false;
1877         bool suspended = local->suspended;
1878
1879         /* nothing to do if HW shouldn't run */
1880         if (!local->open_count)
1881                 goto wake_up;
1882
1883 #ifdef CONFIG_PM
1884         if (suspended)
1885                 local->resuming = true;
1886
1887         if (local->wowlan) {
1888                 /*
1889                  * In the wowlan case, both mac80211 and the device
1890                  * are functional when the resume op is called, so
1891                  * clear local->suspended so the device could operate
1892                  * normally (e.g. pass rx frames).
1893                  */
1894                 local->suspended = false;
1895                 res = drv_resume(local);
1896                 local->wowlan = false;
1897                 if (res < 0) {
1898                         local->resuming = false;
1899                         return res;
1900                 }
1901                 if (res == 0)
1902                         goto wake_up;
1903                 WARN_ON(res > 1);
1904                 /*
1905                  * res is 1, which means the driver requested
1906                  * to go through a regular reset on wakeup.
1907                  * restore local->suspended in this case.
1908                  */
1909                 reconfig_due_to_wowlan = true;
1910                 local->suspended = true;
1911         }
1912 #endif
1913
1914         /*
1915          * In case of hw_restart during suspend (without wowlan),
1916          * cancel restart work, as we are reconfiguring the device
1917          * anyway.
1918          * Note that restart_work is scheduled on a frozen workqueue,
1919          * so we can't deadlock in this case.
1920          */
1921         if (suspended && local->in_reconfig && !reconfig_due_to_wowlan)
1922                 cancel_work_sync(&local->restart_work);
1923
1924         local->started = false;
1925
1926         /*
1927          * Upon resume hardware can sometimes be goofy due to
1928          * various platform / driver / bus issues, so restarting
1929          * the device may at times not work immediately. Propagate
1930          * the error.
1931          */
1932         res = drv_start(local);
1933         if (res) {
1934                 if (suspended)
1935                         WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1936                 else
1937                         WARN(1, "Hardware became unavailable during restart.\n");
1938                 ieee80211_handle_reconfig_failure(local);
1939                 return res;
1940         }
1941
1942         /* setup fragmentation threshold */
1943         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1944
1945         /* setup RTS threshold */
1946         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1947
1948         /* reset coverage class */
1949         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1950
1951         ieee80211_led_radio(local, true);
1952         ieee80211_mod_tpt_led_trig(local,
1953                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1954
1955         /* add interfaces */
1956         sdata = rtnl_dereference(local->monitor_sdata);
1957         if (sdata) {
1958                 /* in HW restart it exists already */
1959                 WARN_ON(local->resuming);
1960                 res = drv_add_interface(local, sdata);
1961                 if (WARN_ON(res)) {
1962                         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1963                         synchronize_net();
1964                         kfree(sdata);
1965                 }
1966         }
1967
1968         list_for_each_entry(sdata, &local->interfaces, list) {
1969                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1970                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1971                     ieee80211_sdata_running(sdata)) {
1972                         res = drv_add_interface(local, sdata);
1973                         if (WARN_ON(res))
1974                                 break;
1975                 }
1976         }
1977
1978         /* If adding any of the interfaces failed above, roll back and
1979          * report failure.
1980          */
1981         if (res) {
1982                 list_for_each_entry_continue_reverse(sdata, &local->interfaces,
1983                                                      list)
1984                         if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1985                             sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1986                             ieee80211_sdata_running(sdata))
1987                                 drv_remove_interface(local, sdata);
1988                 ieee80211_handle_reconfig_failure(local);
1989                 return res;
1990         }
1991
1992         /* add channel contexts */
1993         if (local->use_chanctx) {
1994                 mutex_lock(&local->chanctx_mtx);
1995                 list_for_each_entry(ctx, &local->chanctx_list, list)
1996                         if (ctx->replace_state !=
1997                             IEEE80211_CHANCTX_REPLACES_OTHER)
1998                                 WARN_ON(drv_add_chanctx(local, ctx));
1999                 mutex_unlock(&local->chanctx_mtx);
2000
2001                 sdata = rtnl_dereference(local->monitor_sdata);
2002                 if (sdata && ieee80211_sdata_running(sdata))
2003                         ieee80211_assign_chanctx(local, sdata);
2004         }
2005
2006         /* reconfigure hardware */
2007         ieee80211_hw_config(local, ~0);
2008
2009         ieee80211_configure_filter(local);
2010
2011         /* Finally also reconfigure all the BSS information */
2012         list_for_each_entry(sdata, &local->interfaces, list) {
2013                 u32 changed;
2014
2015                 if (!ieee80211_sdata_running(sdata))
2016                         continue;
2017
2018                 ieee80211_assign_chanctx(local, sdata);
2019
2020                 switch (sdata->vif.type) {
2021                 case NL80211_IFTYPE_AP_VLAN:
2022                 case NL80211_IFTYPE_MONITOR:
2023                         break;
2024                 default:
2025                         ieee80211_reconfig_stations(sdata);
2026                         /* fall through */
2027                 case NL80211_IFTYPE_AP: /* AP stations are handled later */
2028                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
2029                                 drv_conf_tx(local, sdata, i,
2030                                             &sdata->tx_conf[i]);
2031                         break;
2032                 }
2033
2034                 /* common change flags for all interface types */
2035                 changed = BSS_CHANGED_ERP_CTS_PROT |
2036                           BSS_CHANGED_ERP_PREAMBLE |
2037                           BSS_CHANGED_ERP_SLOT |
2038                           BSS_CHANGED_HT |
2039                           BSS_CHANGED_BASIC_RATES |
2040                           BSS_CHANGED_BEACON_INT |
2041                           BSS_CHANGED_BSSID |
2042                           BSS_CHANGED_CQM |
2043                           BSS_CHANGED_QOS |
2044                           BSS_CHANGED_IDLE |
2045                           BSS_CHANGED_TXPOWER |
2046                           BSS_CHANGED_MCAST_RATE;
2047
2048                 if (sdata->vif.mu_mimo_owner)
2049                         changed |= BSS_CHANGED_MU_GROUPS;
2050
2051                 switch (sdata->vif.type) {
2052                 case NL80211_IFTYPE_STATION:
2053                         changed |= BSS_CHANGED_ASSOC |
2054                                    BSS_CHANGED_ARP_FILTER |
2055                                    BSS_CHANGED_PS;
2056
2057                         /* Re-send beacon info report to the driver */
2058                         if (sdata->u.mgd.have_beacon)
2059                                 changed |= BSS_CHANGED_BEACON_INFO;
2060
2061                         if (sdata->vif.bss_conf.max_idle_period ||
2062                             sdata->vif.bss_conf.protected_keep_alive)
2063                                 changed |= BSS_CHANGED_KEEP_ALIVE;
2064
2065                         sdata_lock(sdata);
2066                         ieee80211_bss_info_change_notify(sdata, changed);
2067                         sdata_unlock(sdata);
2068                         break;
2069                 case NL80211_IFTYPE_OCB:
2070                         changed |= BSS_CHANGED_OCB;
2071                         ieee80211_bss_info_change_notify(sdata, changed);
2072                         break;
2073                 case NL80211_IFTYPE_ADHOC:
2074                         changed |= BSS_CHANGED_IBSS;
2075                         /* fall through */
2076                 case NL80211_IFTYPE_AP:
2077                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
2078
2079                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
2080                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
2081
2082                                 if (rcu_access_pointer(sdata->u.ap.beacon))
2083                                         drv_start_ap(local, sdata);
2084                         }
2085
2086                         /* fall through */
2087                 case NL80211_IFTYPE_MESH_POINT:
2088                         if (sdata->vif.bss_conf.enable_beacon) {
2089                                 changed |= BSS_CHANGED_BEACON |
2090                                            BSS_CHANGED_BEACON_ENABLED;
2091                                 ieee80211_bss_info_change_notify(sdata, changed);
2092                         }
2093                         break;
2094                 case NL80211_IFTYPE_NAN:
2095                         res = ieee80211_reconfig_nan(sdata);
2096                         if (res < 0) {
2097                                 ieee80211_handle_reconfig_failure(local);
2098                                 return res;
2099                         }
2100                         break;
2101                 case NL80211_IFTYPE_WDS:
2102                 case NL80211_IFTYPE_AP_VLAN:
2103                 case NL80211_IFTYPE_MONITOR:
2104                 case NL80211_IFTYPE_P2P_DEVICE:
2105                         /* nothing to do */
2106                         break;
2107                 case NL80211_IFTYPE_UNSPECIFIED:
2108                 case NUM_NL80211_IFTYPES:
2109                 case NL80211_IFTYPE_P2P_CLIENT:
2110                 case NL80211_IFTYPE_P2P_GO:
2111                         WARN_ON(1);
2112                         break;
2113                 }
2114         }
2115
2116         ieee80211_recalc_ps(local);
2117
2118         /*
2119          * The sta might be in psm against the ap (e.g. because
2120          * this was the state before a hw restart), so we
2121          * explicitly send a null packet in order to make sure
2122          * it'll sync against the ap (and get out of psm).
2123          */
2124         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
2125                 list_for_each_entry(sdata, &local->interfaces, list) {
2126                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2127                                 continue;
2128                         if (!sdata->u.mgd.associated)
2129                                 continue;
2130
2131                         ieee80211_send_nullfunc(local, sdata, false);
2132                 }
2133         }
2134
2135         /* APs are now beaconing, add back stations */
2136         mutex_lock(&local->sta_mtx);
2137         list_for_each_entry(sta, &local->sta_list, list) {
2138                 enum ieee80211_sta_state state;
2139
2140                 if (!sta->uploaded)
2141                         continue;
2142
2143                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP &&
2144                     sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
2145                         continue;
2146
2147                 for (state = IEEE80211_STA_NOTEXIST;
2148                      state < sta->sta_state; state++)
2149                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
2150                                               state + 1));
2151         }
2152         mutex_unlock(&local->sta_mtx);
2153
2154         /* add back keys */
2155         list_for_each_entry(sdata, &local->interfaces, list)
2156                 ieee80211_reset_crypto_tx_tailroom(sdata);
2157
2158         list_for_each_entry(sdata, &local->interfaces, list)
2159                 if (ieee80211_sdata_running(sdata))
2160                         ieee80211_enable_keys(sdata);
2161
2162         /* Reconfigure sched scan if it was interrupted by FW restart */
2163         mutex_lock(&local->mtx);
2164         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
2165                                                 lockdep_is_held(&local->mtx));
2166         sched_scan_req = rcu_dereference_protected(local->sched_scan_req,
2167                                                 lockdep_is_held(&local->mtx));
2168         if (sched_scan_sdata && sched_scan_req)
2169                 /*
2170                  * Sched scan stopped, but we don't want to report it. Instead,
2171                  * we're trying to reschedule. However, if more than one scan
2172                  * plan was set, we cannot reschedule since we don't know which
2173                  * scan plan was currently running (and some scan plans may have
2174                  * already finished).
2175                  */
2176                 if (sched_scan_req->n_scan_plans > 1 ||
2177                     __ieee80211_request_sched_scan_start(sched_scan_sdata,
2178                                                          sched_scan_req)) {
2179                         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
2180                         RCU_INIT_POINTER(local->sched_scan_req, NULL);
2181                         sched_scan_stopped = true;
2182                 }
2183         mutex_unlock(&local->mtx);
2184
2185         if (sched_scan_stopped)
2186                 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy, 0);
2187
2188  wake_up:
2189
2190         if (local->monitors == local->open_count && local->monitors > 0)
2191                 ieee80211_add_virtual_monitor(local);
2192
2193         /*
2194          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
2195          * sessions can be established after a resume.
2196          *
2197          * Also tear down aggregation sessions since reconfiguring
2198          * them in a hardware restart scenario is not easily done
2199          * right now, and the hardware will have lost information
2200          * about the sessions, but we and the AP still think they
2201          * are active. This is really a workaround though.
2202          */
2203         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
2204                 mutex_lock(&local->sta_mtx);
2205
2206                 list_for_each_entry(sta, &local->sta_list, list) {
2207                         if (!local->resuming)
2208                                 ieee80211_sta_tear_down_BA_sessions(
2209                                                 sta, AGG_STOP_LOCAL_REQUEST);
2210                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
2211                 }
2212
2213                 mutex_unlock(&local->sta_mtx);
2214         }
2215
2216         if (local->in_reconfig) {
2217                 local->in_reconfig = false;
2218                 barrier();
2219
2220                 /* Restart deferred ROCs */
2221                 mutex_lock(&local->mtx);
2222                 ieee80211_start_next_roc(local);
2223                 mutex_unlock(&local->mtx);
2224         }
2225
2226         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
2227                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
2228                                         false);
2229
2230         /*
2231          * If this is for hw restart things are still running.
2232          * We may want to change that later, however.
2233          */
2234         if (local->open_count && (!suspended || reconfig_due_to_wowlan))
2235                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_RESTART);
2236
2237         if (!suspended)
2238                 return 0;
2239
2240 #ifdef CONFIG_PM
2241         /* first set suspended false, then resuming */
2242         local->suspended = false;
2243         mb();
2244         local->resuming = false;
2245
2246         ieee80211_flush_completed_scan(local, false);
2247
2248         if (local->open_count && !reconfig_due_to_wowlan)
2249                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_SUSPEND);
2250
2251         list_for_each_entry(sdata, &local->interfaces, list) {
2252                 if (!ieee80211_sdata_running(sdata))
2253                         continue;
2254                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2255                         ieee80211_sta_restart(sdata);
2256         }
2257
2258         mod_timer(&local->sta_cleanup, jiffies + 1);
2259 #else
2260         WARN_ON(1);
2261 #endif
2262
2263         return 0;
2264 }
2265
2266 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
2267 {
2268         struct ieee80211_sub_if_data *sdata;
2269         struct ieee80211_local *local;
2270         struct ieee80211_key *key;
2271
2272         if (WARN_ON(!vif))
2273                 return;
2274
2275         sdata = vif_to_sdata(vif);
2276         local = sdata->local;
2277
2278         if (WARN_ON(!local->resuming))
2279                 return;
2280
2281         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2282                 return;
2283
2284         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
2285
2286         mutex_lock(&local->key_mtx);
2287         list_for_each_entry(key, &sdata->key_list, list)
2288                 key->flags |= KEY_FLAG_TAINTED;
2289         mutex_unlock(&local->key_mtx);
2290 }
2291 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
2292
2293 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
2294 {
2295         struct ieee80211_local *local = sdata->local;
2296         struct ieee80211_chanctx_conf *chanctx_conf;
2297         struct ieee80211_chanctx *chanctx;
2298
2299         mutex_lock(&local->chanctx_mtx);
2300
2301         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2302                                         lockdep_is_held(&local->chanctx_mtx));
2303
2304         /*
2305          * This function can be called from a work, thus it may be possible
2306          * that the chanctx_conf is removed (due to a disconnection, for
2307          * example).
2308          * So nothing should be done in such case.
2309          */
2310         if (!chanctx_conf)
2311                 goto unlock;
2312
2313         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2314         ieee80211_recalc_smps_chanctx(local, chanctx);
2315  unlock:
2316         mutex_unlock(&local->chanctx_mtx);
2317 }
2318
2319 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
2320 {
2321         struct ieee80211_local *local = sdata->local;
2322         struct ieee80211_chanctx_conf *chanctx_conf;
2323         struct ieee80211_chanctx *chanctx;
2324
2325         mutex_lock(&local->chanctx_mtx);
2326
2327         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2328                                         lockdep_is_held(&local->chanctx_mtx));
2329
2330         if (WARN_ON_ONCE(!chanctx_conf))
2331                 goto unlock;
2332
2333         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2334         ieee80211_recalc_chanctx_min_def(local, chanctx);
2335  unlock:
2336         mutex_unlock(&local->chanctx_mtx);
2337 }
2338
2339 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
2340 {
2341         size_t pos = offset;
2342
2343         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
2344                 pos += 2 + ies[pos + 1];
2345
2346         return pos;
2347 }
2348
2349 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
2350                                             int rssi_min_thold,
2351                                             int rssi_max_thold)
2352 {
2353         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
2354
2355         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2356                 return;
2357
2358         /*
2359          * Scale up threshold values before storing it, as the RSSI averaging
2360          * algorithm uses a scaled up value as well. Change this scaling
2361          * factor if the RSSI averaging algorithm changes.
2362          */
2363         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
2364         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
2365 }
2366
2367 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
2368                                     int rssi_min_thold,
2369                                     int rssi_max_thold)
2370 {
2371         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2372
2373         WARN_ON(rssi_min_thold == rssi_max_thold ||
2374                 rssi_min_thold > rssi_max_thold);
2375
2376         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2377                                        rssi_max_thold);
2378 }
2379 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2380
2381 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2382 {
2383         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2384
2385         _ieee80211_enable_rssi_reports(sdata, 0, 0);
2386 }
2387 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2388
2389 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2390                               u16 cap)
2391 {
2392         __le16 tmp;
2393
2394         *pos++ = WLAN_EID_HT_CAPABILITY;
2395         *pos++ = sizeof(struct ieee80211_ht_cap);
2396         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2397
2398         /* capability flags */
2399         tmp = cpu_to_le16(cap);
2400         memcpy(pos, &tmp, sizeof(u16));
2401         pos += sizeof(u16);
2402
2403         /* AMPDU parameters */
2404         *pos++ = ht_cap->ampdu_factor |
2405                  (ht_cap->ampdu_density <<
2406                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2407
2408         /* MCS set */
2409         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2410         pos += sizeof(ht_cap->mcs);
2411
2412         /* extended capabilities */
2413         pos += sizeof(__le16);
2414
2415         /* BF capabilities */
2416         pos += sizeof(__le32);
2417
2418         /* antenna selection */
2419         pos += sizeof(u8);
2420
2421         return pos;
2422 }
2423
2424 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2425                                u32 cap)
2426 {
2427         __le32 tmp;
2428
2429         *pos++ = WLAN_EID_VHT_CAPABILITY;
2430         *pos++ = sizeof(struct ieee80211_vht_cap);
2431         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2432
2433         /* capability flags */
2434         tmp = cpu_to_le32(cap);
2435         memcpy(pos, &tmp, sizeof(u32));
2436         pos += sizeof(u32);
2437
2438         /* VHT MCS set */
2439         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2440         pos += sizeof(vht_cap->vht_mcs);
2441
2442         return pos;
2443 }
2444
2445 u8 *ieee80211_ie_build_he_cap(u8 *pos,
2446                               const struct ieee80211_sta_he_cap *he_cap,
2447                               u8 *end)
2448 {
2449         u8 n;
2450         u8 ie_len;
2451         u8 *orig_pos = pos;
2452
2453         /* Make sure we have place for the IE */
2454         /*
2455          * TODO: the 1 added is because this temporarily is under the EXTENSION
2456          * IE. Get rid of it when it moves.
2457          */
2458         if (!he_cap)
2459                 return orig_pos;
2460
2461         n = ieee80211_he_mcs_nss_size(&he_cap->he_cap_elem);
2462         ie_len = 2 + 1 +
2463                  sizeof(he_cap->he_cap_elem) + n +
2464                  ieee80211_he_ppe_size(he_cap->ppe_thres[0],
2465                                        he_cap->he_cap_elem.phy_cap_info);
2466
2467         if ((end - pos) < ie_len)
2468                 return orig_pos;
2469
2470         *pos++ = WLAN_EID_EXTENSION;
2471         pos++; /* We'll set the size later below */
2472         *pos++ = WLAN_EID_EXT_HE_CAPABILITY;
2473
2474         /* Fixed data */
2475         memcpy(pos, &he_cap->he_cap_elem, sizeof(he_cap->he_cap_elem));
2476         pos += sizeof(he_cap->he_cap_elem);
2477
2478         memcpy(pos, &he_cap->he_mcs_nss_supp, n);
2479         pos += n;
2480
2481         /* Check if PPE Threshold should be present */
2482         if ((he_cap->he_cap_elem.phy_cap_info[6] &
2483              IEEE80211_HE_PHY_CAP6_PPE_THRESHOLD_PRESENT) == 0)
2484                 goto end;
2485
2486         /*
2487          * Calculate how many PPET16/PPET8 pairs are to come. Algorithm:
2488          * (NSS_M1 + 1) x (num of 1 bits in RU_INDEX_BITMASK)
2489          */
2490         n = hweight8(he_cap->ppe_thres[0] &
2491                      IEEE80211_PPE_THRES_RU_INDEX_BITMASK_MASK);
2492         n *= (1 + ((he_cap->ppe_thres[0] & IEEE80211_PPE_THRES_NSS_MASK) >>
2493                    IEEE80211_PPE_THRES_NSS_POS));
2494
2495         /*
2496          * Each pair is 6 bits, and we need to add the 7 "header" bits to the
2497          * total size.
2498          */
2499         n = (n * IEEE80211_PPE_THRES_INFO_PPET_SIZE * 2) + 7;
2500         n = DIV_ROUND_UP(n, 8);
2501
2502         /* Copy PPE Thresholds */
2503         memcpy(pos, &he_cap->ppe_thres, n);
2504         pos += n;
2505
2506 end:
2507         orig_pos[1] = (pos - orig_pos) - 2;
2508         return pos;
2509 }
2510
2511 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2512                                const struct cfg80211_chan_def *chandef,
2513                                u16 prot_mode, bool rifs_mode)
2514 {
2515         struct ieee80211_ht_operation *ht_oper;
2516         /* Build HT Information */
2517         *pos++ = WLAN_EID_HT_OPERATION;
2518         *pos++ = sizeof(struct ieee80211_ht_operation);
2519         ht_oper = (struct ieee80211_ht_operation *)pos;
2520         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2521                                         chandef->chan->center_freq);
2522         switch (chandef->width) {
2523         case NL80211_CHAN_WIDTH_160:
2524         case NL80211_CHAN_WIDTH_80P80:
2525         case NL80211_CHAN_WIDTH_80:
2526         case NL80211_CHAN_WIDTH_40:
2527                 if (chandef->center_freq1 > chandef->chan->center_freq)
2528                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2529                 else
2530                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2531                 break;
2532         default:
2533                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2534                 break;
2535         }
2536         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2537             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2538             chandef->width != NL80211_CHAN_WIDTH_20)
2539                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2540
2541         if (rifs_mode)
2542                 ht_oper->ht_param |= IEEE80211_HT_PARAM_RIFS_MODE;
2543
2544         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2545         ht_oper->stbc_param = 0x0000;
2546
2547         /* It seems that Basic MCS set and Supported MCS set
2548            are identical for the first 10 bytes */
2549         memset(&ht_oper->basic_set, 0, 16);
2550         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2551
2552         return pos + sizeof(struct ieee80211_ht_operation);
2553 }
2554
2555 void ieee80211_ie_build_wide_bw_cs(u8 *pos,
2556                                    const struct cfg80211_chan_def *chandef)
2557 {
2558         *pos++ = WLAN_EID_WIDE_BW_CHANNEL_SWITCH;       /* EID */
2559         *pos++ = 3;                                     /* IE length */
2560         /* New channel width */
2561         switch (chandef->width) {
2562         case NL80211_CHAN_WIDTH_80:
2563                 *pos++ = IEEE80211_VHT_CHANWIDTH_80MHZ;
2564                 break;
2565         case NL80211_CHAN_WIDTH_160:
2566                 *pos++ = IEEE80211_VHT_CHANWIDTH_160MHZ;
2567                 break;
2568         case NL80211_CHAN_WIDTH_80P80:
2569                 *pos++ = IEEE80211_VHT_CHANWIDTH_80P80MHZ;
2570                 break;
2571         default:
2572                 *pos++ = IEEE80211_VHT_CHANWIDTH_USE_HT;
2573         }
2574
2575         /* new center frequency segment 0 */
2576         *pos++ = ieee80211_frequency_to_channel(chandef->center_freq1);
2577         /* new center frequency segment 1 */
2578         if (chandef->center_freq2)
2579                 *pos++ = ieee80211_frequency_to_channel(chandef->center_freq2);
2580         else
2581                 *pos++ = 0;
2582 }
2583
2584 u8 *ieee80211_ie_build_vht_oper(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2585                                 const struct cfg80211_chan_def *chandef)
2586 {
2587         struct ieee80211_vht_operation *vht_oper;
2588
2589         *pos++ = WLAN_EID_VHT_OPERATION;
2590         *pos++ = sizeof(struct ieee80211_vht_operation);
2591         vht_oper = (struct ieee80211_vht_operation *)pos;
2592         vht_oper->center_freq_seg0_idx = ieee80211_frequency_to_channel(
2593                                                         chandef->center_freq1);
2594         if (chandef->center_freq2)
2595                 vht_oper->center_freq_seg1_idx =
2596                         ieee80211_frequency_to_channel(chandef->center_freq2);
2597         else
2598                 vht_oper->center_freq_seg1_idx = 0x00;
2599
2600         switch (chandef->width) {
2601         case NL80211_CHAN_WIDTH_160:
2602                 /*
2603                  * Convert 160 MHz channel width to new style as interop
2604                  * workaround.
2605                  */
2606                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2607                 vht_oper->center_freq_seg1_idx = vht_oper->center_freq_seg0_idx;
2608                 if (chandef->chan->center_freq < chandef->center_freq1)
2609                         vht_oper->center_freq_seg0_idx -= 8;
2610                 else
2611                         vht_oper->center_freq_seg0_idx += 8;
2612                 break;
2613         case NL80211_CHAN_WIDTH_80P80:
2614                 /*
2615                  * Convert 80+80 MHz channel width to new style as interop
2616                  * workaround.
2617                  */
2618                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2619                 break;
2620         case NL80211_CHAN_WIDTH_80:
2621                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2622                 break;
2623         default:
2624                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
2625                 break;
2626         }
2627
2628         /* don't require special VHT peer rates */
2629         vht_oper->basic_mcs_set = cpu_to_le16(0xffff);
2630
2631         return pos + sizeof(struct ieee80211_vht_operation);
2632 }
2633
2634 bool ieee80211_chandef_ht_oper(const struct ieee80211_ht_operation *ht_oper,
2635                                struct cfg80211_chan_def *chandef)
2636 {
2637         enum nl80211_channel_type channel_type;
2638
2639         if (!ht_oper)
2640                 return false;
2641
2642         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2643         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2644                 channel_type = NL80211_CHAN_HT20;
2645                 break;
2646         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2647                 channel_type = NL80211_CHAN_HT40PLUS;
2648                 break;
2649         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2650                 channel_type = NL80211_CHAN_HT40MINUS;
2651                 break;
2652         default:
2653                 channel_type = NL80211_CHAN_NO_HT;
2654                 return false;
2655         }
2656
2657         cfg80211_chandef_create(chandef, chandef->chan, channel_type);
2658         return true;
2659 }
2660
2661 bool ieee80211_chandef_vht_oper(const struct ieee80211_vht_operation *oper,
2662                                 struct cfg80211_chan_def *chandef)
2663 {
2664         struct cfg80211_chan_def new = *chandef;
2665         int cf1, cf2;
2666
2667         if (!oper)
2668                 return false;
2669
2670         cf1 = ieee80211_channel_to_frequency(oper->center_freq_seg0_idx,
2671                                              chandef->chan->band);
2672         cf2 = ieee80211_channel_to_frequency(oper->center_freq_seg1_idx,
2673                                              chandef->chan->band);
2674
2675         switch (oper->chan_width) {
2676         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2677                 break;
2678         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2679                 new.width = NL80211_CHAN_WIDTH_80;
2680                 new.center_freq1 = cf1;
2681                 /* If needed, adjust based on the newer interop workaround. */
2682                 if (oper->center_freq_seg1_idx) {
2683                         unsigned int diff;
2684
2685                         diff = abs(oper->center_freq_seg1_idx -
2686                                    oper->center_freq_seg0_idx);
2687                         if (diff == 8) {
2688                                 new.width = NL80211_CHAN_WIDTH_160;
2689                                 new.center_freq1 = cf2;
2690                         } else if (diff > 8) {
2691                                 new.width = NL80211_CHAN_WIDTH_80P80;
2692                                 new.center_freq2 = cf2;
2693                         }
2694                 }
2695                 break;
2696         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2697                 new.width = NL80211_CHAN_WIDTH_160;
2698                 new.center_freq1 = cf1;
2699                 break;
2700         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2701                 new.width = NL80211_CHAN_WIDTH_80P80;
2702                 new.center_freq1 = cf1;
2703                 new.center_freq2 = cf2;
2704                 break;
2705         default:
2706                 return false;
2707         }
2708
2709         if (!cfg80211_chandef_valid(&new))
2710                 return false;
2711
2712         *chandef = new;
2713         return true;
2714 }
2715
2716 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2717                              const struct ieee80211_supported_band *sband,
2718                              const u8 *srates, int srates_len, u32 *rates)
2719 {
2720         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2721         int shift = ieee80211_chandef_get_shift(chandef);
2722         struct ieee80211_rate *br;
2723         int brate, rate, i, j, count = 0;
2724
2725         *rates = 0;
2726
2727         for (i = 0; i < srates_len; i++) {
2728                 rate = srates[i] & 0x7f;
2729
2730                 for (j = 0; j < sband->n_bitrates; j++) {
2731                         br = &sband->bitrates[j];
2732                         if ((rate_flags & br->flags) != rate_flags)
2733                                 continue;
2734
2735                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2736                         if (brate == rate) {
2737                                 *rates |= BIT(j);
2738                                 count++;
2739                                 break;
2740                         }
2741                 }
2742         }
2743         return count;
2744 }
2745
2746 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2747                             struct sk_buff *skb, bool need_basic,
2748                             enum nl80211_band band)
2749 {
2750         struct ieee80211_local *local = sdata->local;
2751         struct ieee80211_supported_band *sband;
2752         int rate, shift;
2753         u8 i, rates, *pos;
2754         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2755         u32 rate_flags;
2756
2757         shift = ieee80211_vif_get_shift(&sdata->vif);
2758         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2759         sband = local->hw.wiphy->bands[band];
2760         rates = 0;
2761         for (i = 0; i < sband->n_bitrates; i++) {
2762                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2763                         continue;
2764                 rates++;
2765         }
2766         if (rates > 8)
2767                 rates = 8;
2768
2769         if (skb_tailroom(skb) < rates + 2)
2770                 return -ENOMEM;
2771
2772         pos = skb_put(skb, rates + 2);
2773         *pos++ = WLAN_EID_SUPP_RATES;
2774         *pos++ = rates;
2775         for (i = 0; i < rates; i++) {
2776                 u8 basic = 0;
2777                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2778                         continue;
2779
2780                 if (need_basic && basic_rates & BIT(i))
2781                         basic = 0x80;
2782                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2783                                     5 * (1 << shift));
2784                 *pos++ = basic | (u8) rate;
2785         }
2786
2787         return 0;
2788 }
2789
2790 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2791                                 struct sk_buff *skb, bool need_basic,
2792                                 enum nl80211_band band)
2793 {
2794         struct ieee80211_local *local = sdata->local;
2795         struct ieee80211_supported_band *sband;
2796         int rate, shift;
2797         u8 i, exrates, *pos;
2798         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2799         u32 rate_flags;
2800
2801         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2802         shift = ieee80211_vif_get_shift(&sdata->vif);
2803
2804         sband = local->hw.wiphy->bands[band];
2805         exrates = 0;
2806         for (i = 0; i < sband->n_bitrates; i++) {
2807                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2808                         continue;
2809                 exrates++;
2810         }
2811
2812         if (exrates > 8)
2813                 exrates -= 8;
2814         else
2815                 exrates = 0;
2816
2817         if (skb_tailroom(skb) < exrates + 2)
2818                 return -ENOMEM;
2819
2820         if (exrates) {
2821                 pos = skb_put(skb, exrates + 2);
2822                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2823                 *pos++ = exrates;
2824                 for (i = 8; i < sband->n_bitrates; i++) {
2825                         u8 basic = 0;
2826                         if ((rate_flags & sband->bitrates[i].flags)
2827                             != rate_flags)
2828                                 continue;
2829                         if (need_basic && basic_rates & BIT(i))
2830                                 basic = 0x80;
2831                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2832                                             5 * (1 << shift));
2833                         *pos++ = basic | (u8) rate;
2834                 }
2835         }
2836         return 0;
2837 }
2838
2839 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2840 {
2841         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2842         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2843
2844         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2845                 /* non-managed type inferfaces */
2846                 return 0;
2847         }
2848         return -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
2849 }
2850 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2851
2852 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2853 {
2854         if (!mcs)
2855                 return 1;
2856
2857         /* TODO: consider rx_highest */
2858
2859         if (mcs->rx_mask[3])
2860                 return 4;
2861         if (mcs->rx_mask[2])
2862                 return 3;
2863         if (mcs->rx_mask[1])
2864                 return 2;
2865         return 1;
2866 }
2867
2868 /**
2869  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2870  * @local: mac80211 hw info struct
2871  * @status: RX status
2872  * @mpdu_len: total MPDU length (including FCS)
2873  * @mpdu_offset: offset into MPDU to calculate timestamp at
2874  *
2875  * This function calculates the RX timestamp at the given MPDU offset, taking
2876  * into account what the RX timestamp was. An offset of 0 will just normalize
2877  * the timestamp to TSF at beginning of MPDU reception.
2878  */
2879 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2880                                      struct ieee80211_rx_status *status,
2881                                      unsigned int mpdu_len,
2882                                      unsigned int mpdu_offset)
2883 {
2884         u64 ts = status->mactime;
2885         struct rate_info ri;
2886         u16 rate;
2887
2888         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2889                 return 0;
2890
2891         memset(&ri, 0, sizeof(ri));
2892
2893         ri.bw = status->bw;
2894
2895         /* Fill cfg80211 rate info */
2896         switch (status->encoding) {
2897         case RX_ENC_HT:
2898                 ri.mcs = status->rate_idx;
2899                 ri.flags |= RATE_INFO_FLAGS_MCS;
2900                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
2901                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2902                 break;
2903         case RX_ENC_VHT:
2904                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2905                 ri.mcs = status->rate_idx;
2906                 ri.nss = status->nss;
2907                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
2908                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2909                 break;
2910         default:
2911                 WARN_ON(1);
2912                 /* fall through */
2913         case RX_ENC_LEGACY: {
2914                 struct ieee80211_supported_band *sband;
2915                 int shift = 0;
2916                 int bitrate;
2917
2918                 switch (status->bw) {
2919                 case RATE_INFO_BW_10:
2920                         shift = 1;
2921                         break;
2922                 case RATE_INFO_BW_5:
2923                         shift = 2;
2924                         break;
2925                 }
2926
2927                 sband = local->hw.wiphy->bands[status->band];
2928                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2929                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2930
2931                 if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
2932                         /* TODO: handle HT/VHT preambles */
2933                         if (status->band == NL80211_BAND_5GHZ) {
2934                                 ts += 20 << shift;
2935                                 mpdu_offset += 2;
2936                         } else if (status->enc_flags & RX_ENC_FLAG_SHORTPRE) {
2937                                 ts += 96;
2938                         } else {
2939                                 ts += 192;
2940                         }
2941                 }
2942                 break;
2943                 }
2944         }
2945
2946         rate = cfg80211_calculate_bitrate(&ri);
2947         if (WARN_ONCE(!rate,
2948                       "Invalid bitrate: flags=0x%llx, idx=%d, vht_nss=%d\n",
2949                       (unsigned long long)status->flag, status->rate_idx,
2950                       status->nss))
2951                 return 0;
2952
2953         /* rewind from end of MPDU */
2954         if (status->flag & RX_FLAG_MACTIME_END)
2955                 ts -= mpdu_len * 8 * 10 / rate;
2956
2957         ts += mpdu_offset * 8 * 10 / rate;
2958
2959         return ts;
2960 }
2961
2962 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2963 {
2964         struct ieee80211_sub_if_data *sdata;
2965         struct cfg80211_chan_def chandef;
2966
2967         /* for interface list, to avoid linking iflist_mtx and chanctx_mtx */
2968         ASSERT_RTNL();
2969
2970         mutex_lock(&local->mtx);
2971         list_for_each_entry(sdata, &local->interfaces, list) {
2972                 /* it might be waiting for the local->mtx, but then
2973                  * by the time it gets it, sdata->wdev.cac_started
2974                  * will no longer be true
2975                  */
2976                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2977
2978                 if (sdata->wdev.cac_started) {
2979                         chandef = sdata->vif.bss_conf.chandef;
2980                         ieee80211_vif_release_channel(sdata);
2981                         cfg80211_cac_event(sdata->dev,
2982                                            &chandef,
2983                                            NL80211_RADAR_CAC_ABORTED,
2984                                            GFP_KERNEL);
2985                 }
2986         }
2987         mutex_unlock(&local->mtx);
2988 }
2989
2990 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2991 {
2992         struct ieee80211_local *local =
2993                 container_of(work, struct ieee80211_local, radar_detected_work);
2994         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2995         struct ieee80211_chanctx *ctx;
2996         int num_chanctx = 0;
2997
2998         mutex_lock(&local->chanctx_mtx);
2999         list_for_each_entry(ctx, &local->chanctx_list, list) {
3000                 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
3001                         continue;
3002
3003                 num_chanctx++;
3004                 chandef = ctx->conf.def;
3005         }
3006         mutex_unlock(&local->chanctx_mtx);
3007
3008         rtnl_lock();
3009         ieee80211_dfs_cac_cancel(local);
3010         rtnl_unlock();
3011
3012         if (num_chanctx > 1)
3013                 /* XXX: multi-channel is not supported yet */
3014                 WARN_ON(1);
3015         else
3016                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
3017 }
3018
3019 void ieee80211_radar_detected(struct ieee80211_hw *hw)
3020 {
3021         struct ieee80211_local *local = hw_to_local(hw);
3022
3023         trace_api_radar_detected(local);
3024
3025         schedule_work(&local->radar_detected_work);
3026 }
3027 EXPORT_SYMBOL(ieee80211_radar_detected);
3028
3029 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
3030 {
3031         u32 ret;
3032         int tmp;
3033
3034         switch (c->width) {
3035         case NL80211_CHAN_WIDTH_20:
3036                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3037                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3038                 break;
3039         case NL80211_CHAN_WIDTH_40:
3040                 c->width = NL80211_CHAN_WIDTH_20;
3041                 c->center_freq1 = c->chan->center_freq;
3042                 ret = IEEE80211_STA_DISABLE_40MHZ |
3043                       IEEE80211_STA_DISABLE_VHT;
3044                 break;
3045         case NL80211_CHAN_WIDTH_80:
3046                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
3047                 /* n_P40 */
3048                 tmp /= 2;
3049                 /* freq_P40 */
3050                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
3051                 c->width = NL80211_CHAN_WIDTH_40;
3052                 ret = IEEE80211_STA_DISABLE_VHT;
3053                 break;
3054         case NL80211_CHAN_WIDTH_80P80:
3055                 c->center_freq2 = 0;
3056                 c->width = NL80211_CHAN_WIDTH_80;
3057                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3058                       IEEE80211_STA_DISABLE_160MHZ;
3059                 break;
3060         case NL80211_CHAN_WIDTH_160:
3061                 /* n_P20 */
3062                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
3063                 /* n_P80 */
3064                 tmp /= 4;
3065                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
3066                 c->width = NL80211_CHAN_WIDTH_80;
3067                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3068                       IEEE80211_STA_DISABLE_160MHZ;
3069                 break;
3070         default:
3071         case NL80211_CHAN_WIDTH_20_NOHT:
3072                 WARN_ON_ONCE(1);
3073                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3074                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3075                 break;
3076         case NL80211_CHAN_WIDTH_5:
3077         case NL80211_CHAN_WIDTH_10:
3078                 WARN_ON_ONCE(1);
3079                 /* keep c->width */
3080                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3081                 break;
3082         }
3083
3084         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
3085
3086         return ret;
3087 }
3088
3089 /*
3090  * Returns true if smps_mode_new is strictly more restrictive than
3091  * smps_mode_old.
3092  */
3093 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
3094                                    enum ieee80211_smps_mode smps_mode_new)
3095 {
3096         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
3097                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
3098                 return false;
3099
3100         switch (smps_mode_old) {
3101         case IEEE80211_SMPS_STATIC:
3102                 return false;
3103         case IEEE80211_SMPS_DYNAMIC:
3104                 return smps_mode_new == IEEE80211_SMPS_STATIC;
3105         case IEEE80211_SMPS_OFF:
3106                 return smps_mode_new != IEEE80211_SMPS_OFF;
3107         default:
3108                 WARN_ON(1);
3109         }
3110
3111         return false;
3112 }
3113
3114 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
3115                               struct cfg80211_csa_settings *csa_settings)
3116 {
3117         struct sk_buff *skb;
3118         struct ieee80211_mgmt *mgmt;
3119         struct ieee80211_local *local = sdata->local;
3120         int freq;
3121         int hdr_len = offsetofend(struct ieee80211_mgmt,
3122                                   u.action.u.chan_switch);
3123         u8 *pos;
3124
3125         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3126             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
3127                 return -EOPNOTSUPP;
3128
3129         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
3130                             5 + /* channel switch announcement element */
3131                             3 + /* secondary channel offset element */
3132                             5 + /* wide bandwidth channel switch announcement */
3133                             8); /* mesh channel switch parameters element */
3134         if (!skb)
3135                 return -ENOMEM;
3136
3137         skb_reserve(skb, local->tx_headroom);
3138         mgmt = skb_put_zero(skb, hdr_len);
3139         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3140                                           IEEE80211_STYPE_ACTION);
3141
3142         eth_broadcast_addr(mgmt->da);
3143         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
3144         if (ieee80211_vif_is_mesh(&sdata->vif)) {
3145                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
3146         } else {
3147                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3148                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
3149         }
3150         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
3151         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
3152         pos = skb_put(skb, 5);
3153         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
3154         *pos++ = 3;                                             /* IE length */
3155         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
3156         freq = csa_settings->chandef.chan->center_freq;
3157         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
3158         *pos++ = csa_settings->count;                           /* count */
3159
3160         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
3161                 enum nl80211_channel_type ch_type;
3162
3163                 skb_put(skb, 3);
3164                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
3165                 *pos++ = 1;                                     /* IE length */
3166                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
3167                 if (ch_type == NL80211_CHAN_HT40PLUS)
3168                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
3169                 else
3170                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
3171         }
3172
3173         if (ieee80211_vif_is_mesh(&sdata->vif)) {
3174                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3175
3176                 skb_put(skb, 8);
3177                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
3178                 *pos++ = 6;                                     /* IE length */
3179                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
3180                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
3181                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
3182                 *pos++ |= csa_settings->block_tx ?
3183                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
3184                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
3185                 pos += 2;
3186                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
3187                 pos += 2;
3188         }
3189
3190         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_80 ||
3191             csa_settings->chandef.width == NL80211_CHAN_WIDTH_80P80 ||
3192             csa_settings->chandef.width == NL80211_CHAN_WIDTH_160) {
3193                 skb_put(skb, 5);
3194                 ieee80211_ie_build_wide_bw_cs(pos, &csa_settings->chandef);
3195         }
3196
3197         ieee80211_tx_skb(sdata, skb);
3198         return 0;
3199 }
3200
3201 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
3202 {
3203         return !(cs == NULL || cs->cipher == 0 ||
3204                  cs->hdr_len < cs->pn_len + cs->pn_off ||
3205                  cs->hdr_len <= cs->key_idx_off ||
3206                  cs->key_idx_shift > 7 ||
3207                  cs->key_idx_mask == 0);
3208 }
3209
3210 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
3211 {
3212         int i;
3213
3214         /* Ensure we have enough iftype bitmap space for all iftype values */
3215         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
3216
3217         for (i = 0; i < n; i++)
3218                 if (!ieee80211_cs_valid(&cs[i]))
3219                         return false;
3220
3221         return true;
3222 }
3223
3224 const struct ieee80211_cipher_scheme *
3225 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
3226                  enum nl80211_iftype iftype)
3227 {
3228         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
3229         int n = local->hw.n_cipher_schemes;
3230         int i;
3231         const struct ieee80211_cipher_scheme *cs = NULL;
3232
3233         for (i = 0; i < n; i++) {
3234                 if (l[i].cipher == cipher) {
3235                         cs = &l[i];
3236                         break;
3237                 }
3238         }
3239
3240         if (!cs || !(cs->iftype & BIT(iftype)))
3241                 return NULL;
3242
3243         return cs;
3244 }
3245
3246 int ieee80211_cs_headroom(struct ieee80211_local *local,
3247                           struct cfg80211_crypto_settings *crypto,
3248                           enum nl80211_iftype iftype)
3249 {
3250         const struct ieee80211_cipher_scheme *cs;
3251         int headroom = IEEE80211_ENCRYPT_HEADROOM;
3252         int i;
3253
3254         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
3255                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
3256                                       iftype);
3257
3258                 if (cs && headroom < cs->hdr_len)
3259                         headroom = cs->hdr_len;
3260         }
3261
3262         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
3263         if (cs && headroom < cs->hdr_len)
3264                 headroom = cs->hdr_len;
3265
3266         return headroom;
3267 }
3268
3269 static bool
3270 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
3271 {
3272         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
3273         int skip;
3274
3275         if (end > 0)
3276                 return false;
3277
3278         /* One shot NOA  */
3279         if (data->count[i] == 1)
3280                 return false;
3281
3282         if (data->desc[i].interval == 0)
3283                 return false;
3284
3285         /* End time is in the past, check for repetitions */
3286         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
3287         if (data->count[i] < 255) {
3288                 if (data->count[i] <= skip) {
3289                         data->count[i] = 0;
3290                         return false;
3291                 }
3292
3293                 data->count[i] -= skip;
3294         }
3295
3296         data->desc[i].start += skip * data->desc[i].interval;
3297
3298         return true;
3299 }
3300
3301 static bool
3302 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
3303                              s32 *offset)
3304 {
3305         bool ret = false;
3306         int i;
3307
3308         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3309                 s32 cur;
3310
3311                 if (!data->count[i])
3312                         continue;
3313
3314                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
3315                         ret = true;
3316
3317                 cur = data->desc[i].start - tsf;
3318                 if (cur > *offset)
3319                         continue;
3320
3321                 cur = data->desc[i].start + data->desc[i].duration - tsf;
3322                 if (cur > *offset)
3323                         *offset = cur;
3324         }
3325
3326         return ret;
3327 }
3328
3329 static u32
3330 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
3331 {
3332         s32 offset = 0;
3333         int tries = 0;
3334         /*
3335          * arbitrary limit, used to avoid infinite loops when combined NoA
3336          * descriptors cover the full time period.
3337          */
3338         int max_tries = 5;
3339
3340         ieee80211_extend_absent_time(data, tsf, &offset);
3341         do {
3342                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
3343                         break;
3344
3345                 tries++;
3346         } while (tries < max_tries);
3347
3348         return offset;
3349 }
3350
3351 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
3352 {
3353         u32 next_offset = BIT(31) - 1;
3354         int i;
3355
3356         data->absent = 0;
3357         data->has_next_tsf = false;
3358         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3359                 s32 start;
3360
3361                 if (!data->count[i])
3362                         continue;
3363
3364                 ieee80211_extend_noa_desc(data, tsf, i);
3365                 start = data->desc[i].start - tsf;
3366                 if (start <= 0)
3367                         data->absent |= BIT(i);
3368
3369                 if (next_offset > start)
3370                         next_offset = start;
3371
3372                 data->has_next_tsf = true;
3373         }
3374
3375         if (data->absent)
3376                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
3377
3378         data->next_tsf = tsf + next_offset;
3379 }
3380 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
3381
3382 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
3383                             struct ieee80211_noa_data *data, u32 tsf)
3384 {
3385         int ret = 0;
3386         int i;
3387
3388         memset(data, 0, sizeof(*data));
3389
3390         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3391                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
3392
3393                 if (!desc->count || !desc->duration)
3394                         continue;
3395
3396                 data->count[i] = desc->count;
3397                 data->desc[i].start = le32_to_cpu(desc->start_time);
3398                 data->desc[i].duration = le32_to_cpu(desc->duration);
3399                 data->desc[i].interval = le32_to_cpu(desc->interval);
3400
3401                 if (data->count[i] > 1 &&
3402                     data->desc[i].interval < data->desc[i].duration)
3403                         continue;
3404
3405                 ieee80211_extend_noa_desc(data, tsf, i);
3406                 ret++;
3407         }
3408
3409         if (ret)
3410                 ieee80211_update_p2p_noa(data, tsf);
3411
3412         return ret;
3413 }
3414 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
3415
3416 void ieee80211_recalc_dtim(struct ieee80211_local *local,
3417                            struct ieee80211_sub_if_data *sdata)
3418 {
3419         u64 tsf = drv_get_tsf(local, sdata);
3420         u64 dtim_count = 0;
3421         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
3422         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
3423         struct ps_data *ps;
3424         u8 bcns_from_dtim;
3425
3426         if (tsf == -1ULL || !beacon_int || !dtim_period)
3427                 return;
3428
3429         if (sdata->vif.type == NL80211_IFTYPE_AP ||
3430             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
3431                 if (!sdata->bss)
3432                         return;
3433
3434                 ps = &sdata->bss->ps;
3435         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3436                 ps = &sdata->u.mesh.ps;
3437         } else {
3438                 return;
3439         }
3440
3441         /*
3442          * actually finds last dtim_count, mac80211 will update in
3443          * __beacon_add_tim().
3444          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
3445          */
3446         do_div(tsf, beacon_int);
3447         bcns_from_dtim = do_div(tsf, dtim_period);
3448         /* just had a DTIM */
3449         if (!bcns_from_dtim)
3450                 dtim_count = 0;
3451         else
3452                 dtim_count = dtim_period - bcns_from_dtim;
3453
3454         ps->dtim_count = dtim_count;
3455 }
3456
3457 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
3458                                          struct ieee80211_chanctx *ctx)
3459 {
3460         struct ieee80211_sub_if_data *sdata;
3461         u8 radar_detect = 0;
3462
3463         lockdep_assert_held(&local->chanctx_mtx);
3464
3465         if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
3466                 return 0;
3467
3468         list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
3469                 if (sdata->reserved_radar_required)
3470                         radar_detect |= BIT(sdata->reserved_chandef.width);
3471
3472         /*
3473          * An in-place reservation context should not have any assigned vifs
3474          * until it replaces the other context.
3475          */
3476         WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
3477                 !list_empty(&ctx->assigned_vifs));
3478
3479         list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
3480                 if (sdata->radar_required)
3481                         radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
3482
3483         return radar_detect;
3484 }
3485
3486 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
3487                                  const struct cfg80211_chan_def *chandef,
3488                                  enum ieee80211_chanctx_mode chanmode,
3489                                  u8 radar_detect)
3490 {
3491         struct ieee80211_local *local = sdata->local;
3492         struct ieee80211_sub_if_data *sdata_iter;
3493         enum nl80211_iftype iftype = sdata->wdev.iftype;
3494         struct ieee80211_chanctx *ctx;
3495         int total = 1;
3496         struct iface_combination_params params = {
3497                 .radar_detect = radar_detect,
3498         };
3499
3500         lockdep_assert_held(&local->chanctx_mtx);
3501
3502         if (WARN_ON(hweight32(radar_detect) > 1))
3503                 return -EINVAL;
3504
3505         if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3506                     !chandef->chan))
3507                 return -EINVAL;
3508
3509         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
3510                 return -EINVAL;
3511
3512         if (sdata->vif.type == NL80211_IFTYPE_AP ||
3513             sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
3514                 /*
3515                  * always passing this is harmless, since it'll be the
3516                  * same value that cfg80211 finds if it finds the same
3517                  * interface ... and that's always allowed
3518                  */
3519                 params.new_beacon_int = sdata->vif.bss_conf.beacon_int;
3520         }
3521
3522         /* Always allow software iftypes */
3523         if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
3524                 if (radar_detect)
3525                         return -EINVAL;
3526                 return 0;
3527         }
3528
3529         if (chandef)
3530                 params.num_different_channels = 1;
3531
3532         if (iftype != NL80211_IFTYPE_UNSPECIFIED)
3533                 params.iftype_num[iftype] = 1;
3534
3535         list_for_each_entry(ctx, &local->chanctx_list, list) {
3536                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3537                         continue;
3538                 params.radar_detect |=
3539                         ieee80211_chanctx_radar_detect(local, ctx);
3540                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
3541                         params.num_different_channels++;
3542                         continue;
3543                 }
3544                 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3545                     cfg80211_chandef_compatible(chandef,
3546                                                 &ctx->conf.def))
3547                         continue;
3548                 params.num_different_channels++;
3549         }
3550
3551         list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
3552                 struct wireless_dev *wdev_iter;
3553
3554                 wdev_iter = &sdata_iter->wdev;
3555
3556                 if (sdata_iter == sdata ||
3557                     !ieee80211_sdata_running(sdata_iter) ||
3558                     local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
3559                         continue;
3560
3561                 params.iftype_num[wdev_iter->iftype]++;
3562                 total++;
3563         }
3564
3565         if (total == 1 && !params.radar_detect)
3566                 return 0;
3567
3568         return cfg80211_check_combinations(local->hw.wiphy, &params);
3569 }
3570
3571 static void
3572 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
3573                          void *data)
3574 {
3575         u32 *max_num_different_channels = data;
3576
3577         *max_num_different_channels = max(*max_num_different_channels,
3578                                           c->num_different_channels);
3579 }
3580
3581 int ieee80211_max_num_channels(struct ieee80211_local *local)
3582 {
3583         struct ieee80211_sub_if_data *sdata;
3584         struct ieee80211_chanctx *ctx;
3585         u32 max_num_different_channels = 1;
3586         int err;
3587         struct iface_combination_params params = {0};
3588
3589         lockdep_assert_held(&local->chanctx_mtx);
3590
3591         list_for_each_entry(ctx, &local->chanctx_list, list) {
3592                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3593                         continue;
3594
3595                 params.num_different_channels++;
3596
3597                 params.radar_detect |=
3598                         ieee80211_chanctx_radar_detect(local, ctx);
3599         }
3600
3601         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3602                 params.iftype_num[sdata->wdev.iftype]++;
3603
3604         err = cfg80211_iter_combinations(local->hw.wiphy, &params,
3605                                          ieee80211_iter_max_chans,
3606                                          &max_num_different_channels);
3607         if (err < 0)
3608                 return err;
3609
3610         return max_num_different_channels;
3611 }
3612
3613 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
3614 {
3615         *buf++ = WLAN_EID_VENDOR_SPECIFIC;
3616         *buf++ = 7; /* len */
3617         *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
3618         *buf++ = 0x50;
3619         *buf++ = 0xf2;
3620         *buf++ = 2; /* WME */
3621         *buf++ = 0; /* WME info */
3622         *buf++ = 1; /* WME ver */
3623         *buf++ = qosinfo; /* U-APSD no in use */
3624
3625         return buf;
3626 }
3627
3628 void ieee80211_txq_get_depth(struct ieee80211_txq *txq,
3629                              unsigned long *frame_cnt,
3630                              unsigned long *byte_cnt)
3631 {
3632         struct txq_info *txqi = to_txq_info(txq);
3633         u32 frag_cnt = 0, frag_bytes = 0;
3634         struct sk_buff *skb;
3635
3636         skb_queue_walk(&txqi->frags, skb) {
3637                 frag_cnt++;
3638                 frag_bytes += skb->len;
3639         }
3640
3641         if (frame_cnt)
3642                 *frame_cnt = txqi->tin.backlog_packets + frag_cnt;
3643
3644         if (byte_cnt)
3645                 *byte_cnt = txqi->tin.backlog_bytes + frag_bytes;
3646 }
3647 EXPORT_SYMBOL(ieee80211_txq_get_depth);
3648
3649 const u8 ieee80211_ac_to_qos_mask[IEEE80211_NUM_ACS] = {
3650         IEEE80211_WMM_IE_STA_QOSINFO_AC_VO,
3651         IEEE80211_WMM_IE_STA_QOSINFO_AC_VI,
3652         IEEE80211_WMM_IE_STA_QOSINFO_AC_BE,
3653         IEEE80211_WMM_IE_STA_QOSINFO_AC_BK
3654 };