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) 2015-2016      Intel Deutschland GmbH
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * utilities for mac80211
  14  */
  15
  16 #include <net/mac80211.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/export.h>
  19 #include <linux/types.h>
  20 #include <linux/slab.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/bitmap.h>
  25 #include <linux/crc32.h>
  26 #include <net/net_namespace.h>
  27 #include <net/cfg80211.h>
  28 #include <net/rtnetlink.h>
  29
  30 #include "ieee80211_i.h"
  31 #include "driver-ops.h"
  32 #include "rate.h"
  33 #include "mesh.h"
  34 #include "wme.h"
  35 #include "led.h"
  36 #include "wep.h"
  37
  38 /* privid for wiphys to determine whether they belong to us or not */
  39 const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid;
  40
  41 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  42 {
  43         struct ieee80211_local *local;
  44         BUG_ON(!wiphy);
  45
  46         local = wiphy_priv(wiphy);
  47         return &local->hw;
  48 }
  49 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  50
  51 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  52 {
  53         struct sk_buff *skb;
  54         struct ieee80211_hdr *hdr;
  55
  56         skb_queue_walk(&tx->skbs, skb) {
  57                 hdr = (struct ieee80211_hdr *) skb->data;
  58                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
  59         }
  60 }
  61
  62 int ieee80211_frame_duration(enum nl80211_band band, size_t len,
  63                              int rate, int erp, int short_preamble,
  64                              int shift)
  65 {
  66         int dur;
  67
  68         /* calculate duration (in microseconds, rounded up to next higher
  69          * integer if it includes a fractional microsecond) to send frame of
  70          * len bytes (does not include FCS) at the given rate. Duration will
  71          * also include SIFS.
  72          *
  73          * rate is in 100 kbps, so divident is multiplied by 10 in the
  74          * DIV_ROUND_UP() operations.
  75          *
  76          * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
  77          * is assumed to be 0 otherwise.
  78          */
  79
  80         if (band == NL80211_BAND_5GHZ || erp) {
  81                 /*
  82                  * OFDM:
  83                  *
  84                  * N_DBPS = DATARATE x 4
  85                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
  86                  *      (16 = SIGNAL time, 6 = tail bits)
  87                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
  88                  *
  89                  * T_SYM = 4 usec
  90                  * 802.11a - 18.5.2: aSIFSTime = 16 usec
  91                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
  92                  *      signal ext = 6 usec
  93                  */
  94                 dur = 16; /* SIFS + signal ext */
  95                 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
  96                 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
  97
  98                 /* IEEE 802.11-2012 18.3.2.4: all values above are:
  99                  *  * times 4 for 5 MHz
 100                  *  * times 2 for 10 MHz
 101                  */
 102                 dur *= 1 << shift;
 103
 104                 /* rates should already consider the channel bandwidth,
 105                  * don't apply divisor again.
 106                  */
 107                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 108                                         4 * rate); /* T_SYM x N_SYM */
 109         } else {
 110                 /*
 111                  * 802.11b or 802.11g with 802.11b compatibility:
 112                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 113                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 114                  *
 115                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 116                  * aSIFSTime = 10 usec
 117                  * aPreambleLength = 144 usec or 72 usec with short preamble
 118                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 119                  */
 120                 dur = 10; /* aSIFSTime = 10 usec */
 121                 dur += short_preamble ? (72 + 24) : (144 + 48);
 122
 123                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 124         }
 125
 126         return dur;
 127 }
 128
 129 /* Exported duration function for driver use */
 130 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 131                                         struct ieee80211_vif *vif,
 132                                         enum nl80211_band band,
 133                                         size_t frame_len,
 134                                         struct ieee80211_rate *rate)
 135 {
 136         struct ieee80211_sub_if_data *sdata;
 137         u16 dur;
 138         int erp, shift = 0;
 139         bool short_preamble = false;
 140
 141         erp = 0;
 142         if (vif) {
 143                 sdata = vif_to_sdata(vif);
 144                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 145                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 146                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 147                 shift = ieee80211_vif_get_shift(vif);
 148         }
 149
 150         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 151                                        short_preamble, shift);
 152
 153         return cpu_to_le16(dur);
 154 }
 155 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 156
 157 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 158                               struct ieee80211_vif *vif, size_t frame_len,
 159                               const struct ieee80211_tx_info *frame_txctl)
 160 {
 161         struct ieee80211_local *local = hw_to_local(hw);
 162         struct ieee80211_rate *rate;
 163         struct ieee80211_sub_if_data *sdata;
 164         bool short_preamble;
 165         int erp, shift = 0, bitrate;
 166         u16 dur;
 167         struct ieee80211_supported_band *sband;
 168
 169         sband = local->hw.wiphy->bands[frame_txctl->band];
 170
 171         short_preamble = false;
 172
 173         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 174
 175         erp = 0;
 176         if (vif) {
 177                 sdata = vif_to_sdata(vif);
 178                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 179                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 180                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 181                 shift = ieee80211_vif_get_shift(vif);
 182         }
 183
 184         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 185
 186         /* CTS duration */
 187         dur = ieee80211_frame_duration(sband->band, 10, bitrate,
 188                                        erp, short_preamble, shift);
 189         /* Data frame duration */
 190         dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
 191                                         erp, short_preamble, shift);
 192         /* ACK duration */
 193         dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 194                                         erp, short_preamble, shift);
 195
 196         return cpu_to_le16(dur);
 197 }
 198 EXPORT_SYMBOL(ieee80211_rts_duration);
 199
 200 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 201                                     struct ieee80211_vif *vif,
 202                                     size_t frame_len,
 203                                     const struct ieee80211_tx_info *frame_txctl)
 204 {
 205         struct ieee80211_local *local = hw_to_local(hw);
 206         struct ieee80211_rate *rate;
 207         struct ieee80211_sub_if_data *sdata;
 208         bool short_preamble;
 209         int erp, shift = 0, bitrate;
 210         u16 dur;
 211         struct ieee80211_supported_band *sband;
 212
 213         sband = local->hw.wiphy->bands[frame_txctl->band];
 214
 215         short_preamble = false;
 216
 217         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 218         erp = 0;
 219         if (vif) {
 220                 sdata = vif_to_sdata(vif);
 221                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 222                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 223                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 224                 shift = ieee80211_vif_get_shift(vif);
 225         }
 226
 227         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 228
 229         /* Data frame duration */
 230         dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
 231                                        erp, short_preamble, shift);
 232         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 233                 /* ACK duration */
 234                 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 235                                                 erp, short_preamble, shift);
 236         }
 237
 238         return cpu_to_le16(dur);
 239 }
 240 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 241
 242 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 243 {
 244         struct ieee80211_sub_if_data *sdata;
 245         int n_acs = IEEE80211_NUM_ACS;
 246
 247         if (local->ops->wake_tx_queue)
 248                 return;
 249
 250         if (local->hw.queues < IEEE80211_NUM_ACS)
 251                 n_acs = 1;
 252
 253         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 254                 int ac;
 255
 256                 if (!sdata->dev)
 257                         continue;
 258
 259                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 260                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 261                         continue;
 262
 263                 for (ac = 0; ac < n_acs; ac++) {
 264                         int ac_queue = sdata->vif.hw_queue[ac];
 265
 266                         if (ac_queue == queue ||
 267                             (sdata->vif.cab_queue == queue &&
 268                              local->queue_stop_reasons[ac_queue] == 0 &&
 269                              skb_queue_empty(&local->pending[ac_queue])))
 270                                 netif_wake_subqueue(sdata->dev, ac);
 271                 }
 272         }
 273 }
 274
 275 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 276                                    enum queue_stop_reason reason,
 277                                    bool refcounted)
 278 {
 279         struct ieee80211_local *local = hw_to_local(hw);
 280
 281         trace_wake_queue(local, queue, reason);
 282
 283         if (WARN_ON(queue >= hw->queues))
 284                 return;
 285
 286         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 287                 return;
 288
 289         if (!refcounted) {
 290                 local->q_stop_reasons[queue][reason] = 0;
 291         } else {
 292                 local->q_stop_reasons[queue][reason]--;
 293                 if (WARN_ON(local->q_stop_reasons[queue][reason] < 0))
 294                         local->q_stop_reasons[queue][reason] = 0;
 295         }
 296
 297         if (local->q_stop_reasons[queue][reason] == 0)
 298                 __clear_bit(reason, &local->queue_stop_reasons[queue]);
 299
 300         if (local->queue_stop_reasons[queue] != 0)
 301                 /* someone still has this queue stopped */
 302                 return;
 303
 304         if (skb_queue_empty(&local->pending[queue])) {
 305                 rcu_read_lock();
 306                 ieee80211_propagate_queue_wake(local, queue);
 307                 rcu_read_unlock();
 308         } else
 309                 tasklet_schedule(&local->tx_pending_tasklet);
 310 }
 311
 312 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 313                                     enum queue_stop_reason reason,
 314                                     bool refcounted)
 315 {
 316         struct ieee80211_local *local = hw_to_local(hw);
 317         unsigned long flags;
 318
 319         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 320         __ieee80211_wake_queue(hw, queue, reason, refcounted);
 321         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 322 }
 323
 324 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 325 {
 326         ieee80211_wake_queue_by_reason(hw, queue,
 327                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 328                                        false);
 329 }
 330 EXPORT_SYMBOL(ieee80211_wake_queue);
 331
 332 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 333                                    enum queue_stop_reason reason,
 334                                    bool refcounted)
 335 {
 336         struct ieee80211_local *local = hw_to_local(hw);
 337         struct ieee80211_sub_if_data *sdata;
 338         int n_acs = IEEE80211_NUM_ACS;
 339
 340         trace_stop_queue(local, queue, reason);
 341
 342         if (WARN_ON(queue >= hw->queues))
 343                 return;
 344
 345         if (!refcounted)
 346                 local->q_stop_reasons[queue][reason] = 1;
 347         else
 348                 local->q_stop_reasons[queue][reason]++;
 349
 350         if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
 351                 return;
 352
 353         if (local->ops->wake_tx_queue)
 354                 return;
 355
 356         if (local->hw.queues < IEEE80211_NUM_ACS)
 357                 n_acs = 1;
 358
 359         rcu_read_lock();
 360         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 361                 int ac;
 362
 363                 if (!sdata->dev)
 364                         continue;
 365
 366                 for (ac = 0; ac < n_acs; ac++) {
 367                         if (sdata->vif.hw_queue[ac] == queue ||
 368                             sdata->vif.cab_queue == queue)
 369                                 netif_stop_subqueue(sdata->dev, ac);
 370                 }
 371         }
 372         rcu_read_unlock();
 373 }
 374
 375 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 376                                     enum queue_stop_reason reason,
 377                                     bool refcounted)
 378 {
 379         struct ieee80211_local *local = hw_to_local(hw);
 380         unsigned long flags;
 381
 382         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 383         __ieee80211_stop_queue(hw, queue, reason, refcounted);
 384         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 385 }
 386
 387 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 388 {
 389         ieee80211_stop_queue_by_reason(hw, queue,
 390                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 391                                        false);
 392 }
 393 EXPORT_SYMBOL(ieee80211_stop_queue);
 394
 395 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 396                                struct sk_buff *skb)
 397 {
 398         struct ieee80211_hw *hw = &local->hw;
 399         unsigned long flags;
 400         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 401         int queue = info->hw_queue;
 402
 403         if (WARN_ON(!info->control.vif)) {
 404                 ieee80211_free_txskb(&local->hw, skb);
 405                 return;
 406         }
 407
 408         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 409         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 410                                false);
 411         __skb_queue_tail(&local->pending[queue], skb);
 412         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 413                                false);
 414         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 415 }
 416
 417 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 418                                 struct sk_buff_head *skbs)
 419 {
 420         struct ieee80211_hw *hw = &local->hw;
 421         struct sk_buff *skb;
 422         unsigned long flags;
 423         int queue, i;
 424
 425         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 426         while ((skb = skb_dequeue(skbs))) {
 427                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 428
 429                 if (WARN_ON(!info->control.vif)) {
 430                         ieee80211_free_txskb(&local->hw, skb);
 431                         continue;
 432                 }
 433
 434                 queue = info->hw_queue;
 435
 436                 __ieee80211_stop_queue(hw, queue,
 437                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 438                                 false);
 439
 440                 __skb_queue_tail(&local->pending[queue], skb);
 441         }
 442
 443         for (i = 0; i < hw->queues; i++)
 444                 __ieee80211_wake_queue(hw, i,
 445                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 446                         false);
 447         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 448 }
 449
 450 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 451                                      unsigned long queues,
 452                                      enum queue_stop_reason reason,
 453                                      bool refcounted)
 454 {
 455         struct ieee80211_local *local = hw_to_local(hw);
 456         unsigned long flags;
 457         int i;
 458
 459         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 460
 461         for_each_set_bit(i, &queues, hw->queues)
 462                 __ieee80211_stop_queue(hw, i, reason, refcounted);
 463
 464         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 465 }
 466
 467 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 468 {
 469         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 470                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 471                                         false);
 472 }
 473 EXPORT_SYMBOL(ieee80211_stop_queues);
 474
 475 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 476 {
 477         struct ieee80211_local *local = hw_to_local(hw);
 478         unsigned long flags;
 479         int ret;
 480
 481         if (WARN_ON(queue >= hw->queues))
 482                 return true;
 483
 484         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 485         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 486                        &local->queue_stop_reasons[queue]);
 487         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 488         return ret;
 489 }
 490 EXPORT_SYMBOL(ieee80211_queue_stopped);
 491
 492 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 493                                      unsigned long queues,
 494                                      enum queue_stop_reason reason,
 495                                      bool refcounted)
 496 {
 497         struct ieee80211_local *local = hw_to_local(hw);
 498         unsigned long flags;
 499         int i;
 500
 501         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 502
 503         for_each_set_bit(i, &queues, hw->queues)
 504                 __ieee80211_wake_queue(hw, i, reason, refcounted);
 505
 506         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 507 }
 508
 509 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 510 {
 511         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 512                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 513                                         false);
 514 }
 515 EXPORT_SYMBOL(ieee80211_wake_queues);
 516
 517 static unsigned int
 518 ieee80211_get_vif_queues(struct ieee80211_local *local,
 519                          struct ieee80211_sub_if_data *sdata)
 520 {
 521         unsigned int queues;
 522
 523         if (sdata && ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
 524                 int ac;
 525
 526                 queues = 0;
 527
 528                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 529                         queues |= BIT(sdata->vif.hw_queue[ac]);
 530                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 531                         queues |= BIT(sdata->vif.cab_queue);
 532         } else {
 533                 /* all queues */
 534                 queues = BIT(local->hw.queues) - 1;
 535         }
 536
 537         return queues;
 538 }
 539
 540 void __ieee80211_flush_queues(struct ieee80211_local *local,
 541                               struct ieee80211_sub_if_data *sdata,
 542                               unsigned int queues, bool drop)
 543 {
 544         if (!local->ops->flush)
 545                 return;
 546
 547         /*
 548          * If no queue was set, or if the HW doesn't support
 549          * IEEE80211_HW_QUEUE_CONTROL - flush all queues
 550          */
 551         if (!queues || !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 552                 queues = ieee80211_get_vif_queues(local, sdata);
 553
 554         ieee80211_stop_queues_by_reason(&local->hw, queues,
 555                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 556                                         false);
 557
 558         drv_flush(local, sdata, queues, drop);
 559
 560         ieee80211_wake_queues_by_reason(&local->hw, queues,
 561                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 562                                         false);
 563 }
 564
 565 void ieee80211_flush_queues(struct ieee80211_local *local,
 566                             struct ieee80211_sub_if_data *sdata, bool drop)
 567 {
 568         __ieee80211_flush_queues(local, sdata, 0, drop);
 569 }
 570
 571 void ieee80211_stop_vif_queues(struct ieee80211_local *local,
 572                                struct ieee80211_sub_if_data *sdata,
 573                                enum queue_stop_reason reason)
 574 {
 575         ieee80211_stop_queues_by_reason(&local->hw,
 576                                         ieee80211_get_vif_queues(local, sdata),
 577                                         reason, true);
 578 }
 579
 580 void ieee80211_wake_vif_queues(struct ieee80211_local *local,
 581                                struct ieee80211_sub_if_data *sdata,
 582                                enum queue_stop_reason reason)
 583 {
 584         ieee80211_wake_queues_by_reason(&local->hw,
 585                                         ieee80211_get_vif_queues(local, sdata),
 586                                         reason, true);
 587 }
 588
 589 static void __iterate_interfaces(struct ieee80211_local *local,
 590                                  u32 iter_flags,
 591                                  void (*iterator)(void *data, u8 *mac,
 592                                                   struct ieee80211_vif *vif),
 593                                  void *data)
 594 {
 595         struct ieee80211_sub_if_data *sdata;
 596         bool active_only = iter_flags & IEEE80211_IFACE_ITER_ACTIVE;
 597
 598         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 599                 switch (sdata->vif.type) {
 600                 case NL80211_IFTYPE_MONITOR:
 601                         if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 602                                 continue;
 603                         break;
 604                 case NL80211_IFTYPE_AP_VLAN:
 605                         continue;
 606                 default:
 607                         break;
 608                 }
 609                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 610                     active_only && !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 611                         continue;
 612                 if (ieee80211_sdata_running(sdata) || !active_only)
 613                         iterator(data, sdata->vif.addr,
 614                                  &sdata->vif);
 615         }
 616
 617         sdata = rcu_dereference_check(local->monitor_sdata,
 618                                       lockdep_is_held(&local->iflist_mtx) ||
 619                                       lockdep_rtnl_is_held());
 620         if (sdata &&
 621             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL || !active_only ||
 622              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 623                 iterator(data, sdata->vif.addr, &sdata->vif);
 624 }
 625
 626 void ieee80211_iterate_interfaces(
 627         struct ieee80211_hw *hw, u32 iter_flags,
 628         void (*iterator)(void *data, u8 *mac,
 629                          struct ieee80211_vif *vif),
 630         void *data)
 631 {
 632         struct ieee80211_local *local = hw_to_local(hw);
 633
 634         mutex_lock(&local->iflist_mtx);
 635         __iterate_interfaces(local, iter_flags, iterator, data);
 636         mutex_unlock(&local->iflist_mtx);
 637 }
 638 EXPORT_SYMBOL_GPL(ieee80211_iterate_interfaces);
 639
 640 void ieee80211_iterate_active_interfaces_atomic(
 641         struct ieee80211_hw *hw, u32 iter_flags,
 642         void (*iterator)(void *data, u8 *mac,
 643                          struct ieee80211_vif *vif),
 644         void *data)
 645 {
 646         struct ieee80211_local *local = hw_to_local(hw);
 647
 648         rcu_read_lock();
 649         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
 650                              iterator, data);
 651         rcu_read_unlock();
 652 }
 653 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 654
 655 void ieee80211_iterate_active_interfaces_rtnl(
 656         struct ieee80211_hw *hw, u32 iter_flags,
 657         void (*iterator)(void *data, u8 *mac,
 658                          struct ieee80211_vif *vif),
 659         void *data)
 660 {
 661         struct ieee80211_local *local = hw_to_local(hw);
 662
 663         ASSERT_RTNL();
 664
 665         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
 666                              iterator, data);
 667 }
 668 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
 669
 670 static void __iterate_stations(struct ieee80211_local *local,
 671                                void (*iterator)(void *data,
 672                                                 struct ieee80211_sta *sta),
 673                                void *data)
 674 {
 675         struct sta_info *sta;
 676
 677         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 678                 if (!sta->uploaded)
 679                         continue;
 680
 681                 iterator(data, &sta->sta);
 682         }
 683 }
 684
 685 void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
 686                         void (*iterator)(void *data,
 687                                          struct ieee80211_sta *sta),
 688                         void *data)
 689 {
 690         struct ieee80211_local *local = hw_to_local(hw);
 691
 692         rcu_read_lock();
 693         __iterate_stations(local, iterator, data);
 694         rcu_read_unlock();
 695 }
 696 EXPORT_SYMBOL_GPL(ieee80211_iterate_stations_atomic);
 697
 698 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
 699 {
 700         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 701
 702         if (!ieee80211_sdata_running(sdata) ||
 703             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 704                 return NULL;
 705         return &sdata->vif;
 706 }
 707 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
 708
 709 struct wireless_dev *ieee80211_vif_to_wdev(struct ieee80211_vif *vif)
 710 {
 711         struct ieee80211_sub_if_data *sdata;
 712
 713         if (!vif)
 714                 return NULL;
 715
 716         sdata = vif_to_sdata(vif);
 717
 718         if (!ieee80211_sdata_running(sdata) ||
 719             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 720                 return NULL;
 721
 722         return &sdata->wdev;
 723 }
 724 EXPORT_SYMBOL_GPL(ieee80211_vif_to_wdev);
 725
 726 /*
 727  * Nothing should have been stuffed into the workqueue during
 728  * the suspend->resume cycle. Since we can't check each caller
 729  * of this function if we are already quiescing / suspended,
 730  * check here and don't WARN since this can actually happen when
 731  * the rx path (for example) is racing against __ieee80211_suspend
 732  * and suspending / quiescing was set after the rx path checked
 733  * them.
 734  */
 735 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 736 {
 737         if (local->quiescing || (local->suspended && !local->resuming)) {
 738                 pr_warn("queueing ieee80211 work while going to suspend\n");
 739                 return false;
 740         }
 741
 742         return true;
 743 }
 744
 745 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 746 {
 747         struct ieee80211_local *local = hw_to_local(hw);
 748
 749         if (!ieee80211_can_queue_work(local))
 750                 return;
 751
 752         queue_work(local->workqueue, work);
 753 }
 754 EXPORT_SYMBOL(ieee80211_queue_work);
 755
 756 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 757                                   struct delayed_work *dwork,
 758                                   unsigned long delay)
 759 {
 760         struct ieee80211_local *local = hw_to_local(hw);
 761
 762         if (!ieee80211_can_queue_work(local))
 763                 return;
 764
 765         queue_delayed_work(local->workqueue, dwork, delay);
 766 }
 767 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 768
 769 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 770                                struct ieee802_11_elems *elems,
 771                                u64 filter, u32 crc)
 772 {
 773         size_t left = len;
 774         const u8 *pos = start;
 775         bool calc_crc = filter != 0;
 776         DECLARE_BITMAP(seen_elems, 256);
 777         const u8 *ie;
 778
 779         bitmap_zero(seen_elems, 256);
 780         memset(elems, 0, sizeof(*elems));
 781         elems->ie_start = start;
 782         elems->total_len = len;
 783
 784         while (left >= 2) {
 785                 u8 id, elen;
 786                 bool elem_parse_failed;
 787
 788                 id = *pos++;
 789                 elen = *pos++;
 790                 left -= 2;
 791
 792                 if (elen > left) {
 793                         elems->parse_error = true;
 794                         break;
 795                 }
 796
 797                 switch (id) {
 798                 case WLAN_EID_SSID:
 799                 case WLAN_EID_SUPP_RATES:
 800                 case WLAN_EID_FH_PARAMS:
 801                 case WLAN_EID_DS_PARAMS:
 802                 case WLAN_EID_CF_PARAMS:
 803                 case WLAN_EID_TIM:
 804                 case WLAN_EID_IBSS_PARAMS:
 805                 case WLAN_EID_CHALLENGE:
 806                 case WLAN_EID_RSN:
 807                 case WLAN_EID_ERP_INFO:
 808                 case WLAN_EID_EXT_SUPP_RATES:
 809                 case WLAN_EID_HT_CAPABILITY:
 810                 case WLAN_EID_HT_OPERATION:
 811                 case WLAN_EID_VHT_CAPABILITY:
 812                 case WLAN_EID_VHT_OPERATION:
 813                 case WLAN_EID_MESH_ID:
 814                 case WLAN_EID_MESH_CONFIG:
 815                 case WLAN_EID_PEER_MGMT:
 816                 case WLAN_EID_PREQ:
 817                 case WLAN_EID_PREP:
 818                 case WLAN_EID_PERR:
 819                 case WLAN_EID_RANN:
 820                 case WLAN_EID_CHANNEL_SWITCH:
 821                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 822                 case WLAN_EID_COUNTRY:
 823                 case WLAN_EID_PWR_CONSTRAINT:
 824                 case WLAN_EID_TIMEOUT_INTERVAL:
 825                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 826                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 827                 case WLAN_EID_CHAN_SWITCH_PARAM:
 828                 case WLAN_EID_EXT_CAPABILITY:
 829                 case WLAN_EID_CHAN_SWITCH_TIMING:
 830                 case WLAN_EID_LINK_ID:
 831                 /*
 832                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 833                  * that if the content gets bigger it might be needed more than once
 834                  */
 835                         if (test_bit(id, seen_elems)) {
 836                                 elems->parse_error = true;
 837                                 left -= elen;
 838                                 pos += elen;
 839                                 continue;
 840                         }
 841                         break;
 842                 }
 843
 844                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 845                         crc = crc32_be(crc, pos - 2, elen + 2);
 846
 847                 elem_parse_failed = false;
 848
 849                 switch (id) {
 850                 case WLAN_EID_LINK_ID:
 851                         if (elen + 2 != sizeof(struct ieee80211_tdls_lnkie)) {
 852                                 elem_parse_failed = true;
 853                                 break;
 854                         }
 855                         elems->lnk_id = (void *)(pos - 2);
 856                         break;
 857                 case WLAN_EID_CHAN_SWITCH_TIMING:
 858                         if (elen != sizeof(struct ieee80211_ch_switch_timing)) {
 859                                 elem_parse_failed = true;
 860                                 break;
 861                         }
 862                         elems->ch_sw_timing = (void *)pos;
 863                         break;
 864                 case WLAN_EID_EXT_CAPABILITY:
 865                         elems->ext_capab = pos;
 866                         elems->ext_capab_len = elen;
 867                         break;
 868                 case WLAN_EID_SSID:
 869                         elems->ssid = pos;
 870                         elems->ssid_len = elen;
 871                         break;
 872                 case WLAN_EID_SUPP_RATES:
 873                         elems->supp_rates = pos;
 874                         elems->supp_rates_len = elen;
 875                         break;
 876                 case WLAN_EID_DS_PARAMS:
 877                         if (elen >= 1)
 878                                 elems->ds_params = pos;
 879                         else
 880                                 elem_parse_failed = true;
 881                         break;
 882                 case WLAN_EID_TIM:
 883                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 884                                 elems->tim = (void *)pos;
 885                                 elems->tim_len = elen;
 886                         } else
 887                                 elem_parse_failed = true;
 888                         break;
 889                 case WLAN_EID_CHALLENGE:
 890                         elems->challenge = pos;
 891                         elems->challenge_len = elen;
 892                         break;
 893                 case WLAN_EID_VENDOR_SPECIFIC:
 894                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 895                             pos[2] == 0xf2) {
 896                                 /* Microsoft OUI (00:50:F2) */
 897
 898                                 if (calc_crc)
 899                                         crc = crc32_be(crc, pos - 2, elen + 2);
 900
 901                                 if (elen >= 5 && pos[3] == 2) {
 902                                         /* OUI Type 2 - WMM IE */
 903                                         if (pos[4] == 0) {
 904                                                 elems->wmm_info = pos;
 905                                                 elems->wmm_info_len = elen;
 906                                         } else if (pos[4] == 1) {
 907                                                 elems->wmm_param = pos;
 908                                                 elems->wmm_param_len = elen;
 909                                         }
 910                                 }
 911                         }
 912                         break;
 913                 case WLAN_EID_RSN:
 914                         elems->rsn = pos;
 915                         elems->rsn_len = elen;
 916                         break;
 917                 case WLAN_EID_ERP_INFO:
 918                         if (elen >= 1)
 919                                 elems->erp_info = pos;
 920                         else
 921                                 elem_parse_failed = true;
 922                         break;
 923                 case WLAN_EID_EXT_SUPP_RATES:
 924                         elems->ext_supp_rates = pos;
 925                         elems->ext_supp_rates_len = elen;
 926                         break;
 927                 case WLAN_EID_HT_CAPABILITY:
 928                         if (elen >= sizeof(struct ieee80211_ht_cap))
 929                                 elems->ht_cap_elem = (void *)pos;
 930                         else
 931                                 elem_parse_failed = true;
 932                         break;
 933                 case WLAN_EID_HT_OPERATION:
 934                         if (elen >= sizeof(struct ieee80211_ht_operation))
 935                                 elems->ht_operation = (void *)pos;
 936                         else
 937                                 elem_parse_failed = true;
 938                         break;
 939                 case WLAN_EID_VHT_CAPABILITY:
 940                         if (elen >= sizeof(struct ieee80211_vht_cap))
 941                                 elems->vht_cap_elem = (void *)pos;
 942                         else
 943                                 elem_parse_failed = true;
 944                         break;
 945                 case WLAN_EID_VHT_OPERATION:
 946                         if (elen >= sizeof(struct ieee80211_vht_operation))
 947                                 elems->vht_operation = (void *)pos;
 948                         else
 949                                 elem_parse_failed = true;
 950                         break;
 951                 case WLAN_EID_OPMODE_NOTIF:
 952                         if (elen > 0)
 953                                 elems->opmode_notif = pos;
 954                         else
 955                                 elem_parse_failed = true;
 956                         break;
 957                 case WLAN_EID_MESH_ID:
 958                         elems->mesh_id = pos;
 959                         elems->mesh_id_len = elen;
 960                         break;
 961                 case WLAN_EID_MESH_CONFIG:
 962                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 963                                 elems->mesh_config = (void *)pos;
 964                         else
 965                                 elem_parse_failed = true;
 966                         break;
 967                 case WLAN_EID_PEER_MGMT:
 968                         elems->peering = pos;
 969                         elems->peering_len = elen;
 970                         break;
 971                 case WLAN_EID_MESH_AWAKE_WINDOW:
 972                         if (elen >= 2)
 973                                 elems->awake_window = (void *)pos;
 974                         break;
 975                 case WLAN_EID_PREQ:
 976                         elems->preq = pos;
 977                         elems->preq_len = elen;
 978                         break;
 979                 case WLAN_EID_PREP:
 980                         elems->prep = pos;
 981                         elems->prep_len = elen;
 982                         break;
 983                 case WLAN_EID_PERR:
 984                         elems->perr = pos;
 985                         elems->perr_len = elen;
 986                         break;
 987                 case WLAN_EID_RANN:
 988                         if (elen >= sizeof(struct ieee80211_rann_ie))
 989                                 elems->rann = (void *)pos;
 990                         else
 991                                 elem_parse_failed = true;
 992                         break;
 993                 case WLAN_EID_CHANNEL_SWITCH:
 994                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 995                                 elem_parse_failed = true;
 996                                 break;
 997                         }
 998                         elems->ch_switch_ie = (void *)pos;
 999                         break;
1000                 case WLAN_EID_EXT_CHANSWITCH_ANN:
1001                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
1002                                 elem_parse_failed = true;
1003                                 break;
1004                         }
1005                         elems->ext_chansw_ie = (void *)pos;
1006                         break;
1007                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
1008                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
1009                                 elem_parse_failed = true;
1010                                 break;
1011                         }
1012                         elems->sec_chan_offs = (void *)pos;
1013                         break;
1014                 case WLAN_EID_CHAN_SWITCH_PARAM:
1015                         if (elen !=
1016                             sizeof(*elems->mesh_chansw_params_ie)) {
1017                                 elem_parse_failed = true;
1018                                 break;
1019                         }
1020                         elems->mesh_chansw_params_ie = (void *)pos;
1021                         break;
1022                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
1023                         if (!action ||
1024                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
1025                                 elem_parse_failed = true;
1026                                 break;
1027                         }
1028                         elems->wide_bw_chansw_ie = (void *)pos;
1029                         break;
1030                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
1031                         if (action) {
1032                                 elem_parse_failed = true;
1033                                 break;
1034                         }
1035                         /*
1036                          * This is a bit tricky, but as we only care about
1037                          * the wide bandwidth channel switch element, so
1038                          * just parse it out manually.
1039                          */
1040                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
1041                                               pos, elen);
1042                         if (ie) {
1043                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
1044                                         elems->wide_bw_chansw_ie =
1045                                                 (void *)(ie + 2);
1046                                 else
1047                                         elem_parse_failed = true;
1048                         }
1049                         break;
1050                 case WLAN_EID_COUNTRY:
1051                         elems->country_elem = pos;
1052                         elems->country_elem_len = elen;
1053                         break;
1054                 case WLAN_EID_PWR_CONSTRAINT:
1055                         if (elen != 1) {
1056                                 elem_parse_failed = true;
1057                                 break;
1058                         }
1059                         elems->pwr_constr_elem = pos;
1060                         break;
1061                 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
1062                         /* Lots of different options exist, but we only care
1063                          * about the Dynamic Transmit Power Control element.
1064                          * First check for the Cisco OUI, then for the DTPC
1065                          * tag (0x00).
1066                          */
1067                         if (elen < 4) {
1068                                 elem_parse_failed = true;
1069                                 break;
1070                         }
1071
1072                         if (pos[0] != 0x00 || pos[1] != 0x40 ||
1073                             pos[2] != 0x96 || pos[3] != 0x00)
1074                                 break;
1075
1076                         if (elen != 6) {
1077                                 elem_parse_failed = true;
1078                                 break;
1079                         }
1080
1081                         if (calc_crc)
1082                                 crc = crc32_be(crc, pos - 2, elen + 2);
1083
1084                         elems->cisco_dtpc_elem = pos;
1085                         break;
1086                 case WLAN_EID_TIMEOUT_INTERVAL:
1087                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
1088                                 elems->timeout_int = (void *)pos;
1089                         else
1090                                 elem_parse_failed = true;
1091                         break;
1092                 default:
1093                         break;
1094                 }
1095
1096                 if (elem_parse_failed)
1097                         elems->parse_error = true;
1098                 else
1099                         __set_bit(id, seen_elems);
1100
1101                 left -= elen;
1102                 pos += elen;
1103         }
1104
1105         if (left != 0)
1106                 elems->parse_error = true;
1107
1108         return crc;
1109 }
1110
1111 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
1112                                bool bss_notify, bool enable_qos)
1113 {
1114         struct ieee80211_local *local = sdata->local;
1115         struct ieee80211_tx_queue_params qparam;
1116         struct ieee80211_chanctx_conf *chanctx_conf;
1117         int ac;
1118         bool use_11b;
1119         bool is_ocb; /* Use another EDCA parameters if dot11OCBActivated=true */
1120         int aCWmin, aCWmax;
1121
1122         if (!local->ops->conf_tx)
1123                 return;
1124
1125         if (local->hw.queues < IEEE80211_NUM_ACS)
1126                 return;
1127
1128         memset(&qparam, 0, sizeof(qparam));
1129
1130         rcu_read_lock();
1131         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1132         use_11b = (chanctx_conf &&
1133                    chanctx_conf->def.chan->band == NL80211_BAND_2GHZ) &&
1134                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1135         rcu_read_unlock();
1136
1137         is_ocb = (sdata->vif.type == NL80211_IFTYPE_OCB);
1138
1139         /* Set defaults according to 802.11-2007 Table 7-37 */
1140         aCWmax = 1023;
1141         if (use_11b)
1142                 aCWmin = 31;
1143         else
1144                 aCWmin = 15;
1145
1146         /* Confiure old 802.11b/g medium access rules. */
1147         qparam.cw_max = aCWmax;
1148         qparam.cw_min = aCWmin;
1149         qparam.txop = 0;
1150         qparam.aifs = 2;
1151
1152         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1153                 /* Update if QoS is enabled. */
1154                 if (enable_qos) {
1155                         switch (ac) {
1156                         case IEEE80211_AC_BK:
1157                                 qparam.cw_max = aCWmax;
1158                                 qparam.cw_min = aCWmin;
1159                                 qparam.txop = 0;
1160                                 if (is_ocb)
1161                                         qparam.aifs = 9;
1162                                 else
1163                                         qparam.aifs = 7;
1164                                 break;
1165                         /* never happens but let's not leave undefined */
1166                         default:
1167                         case IEEE80211_AC_BE:
1168                                 qparam.cw_max = aCWmax;
1169                                 qparam.cw_min = aCWmin;
1170                                 qparam.txop = 0;
1171                                 if (is_ocb)
1172                                         qparam.aifs = 6;
1173                                 else
1174                                         qparam.aifs = 3;
1175                                 break;
1176                         case IEEE80211_AC_VI:
1177                                 qparam.cw_max = aCWmin;
1178                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1179                                 if (is_ocb)
1180                                         qparam.txop = 0;
1181                                 else if (use_11b)
1182                                         qparam.txop = 6016/32;
1183                                 else
1184                                         qparam.txop = 3008/32;
1185
1186                                 if (is_ocb)
1187                                         qparam.aifs = 3;
1188                                 else
1189                                         qparam.aifs = 2;
1190                                 break;
1191                         case IEEE80211_AC_VO:
1192                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1193                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1194                                 if (is_ocb)
1195                                         qparam.txop = 0;
1196                                 else if (use_11b)
1197                                         qparam.txop = 3264/32;
1198                                 else
1199                                         qparam.txop = 1504/32;
1200                                 qparam.aifs = 2;
1201                                 break;
1202                         }
1203                 }
1204
1205                 qparam.uapsd = false;
1206
1207                 sdata->tx_conf[ac] = qparam;
1208                 drv_conf_tx(local, sdata, ac, &qparam);
1209         }
1210
1211         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1212             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1213             sdata->vif.type != NL80211_IFTYPE_NAN) {
1214                 sdata->vif.bss_conf.qos = enable_qos;
1215                 if (bss_notify)
1216                         ieee80211_bss_info_change_notify(sdata,
1217                                                          BSS_CHANGED_QOS);
1218         }
1219 }
1220
1221 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1222                          u16 transaction, u16 auth_alg, u16 status,
1223                          const u8 *extra, size_t extra_len, const u8 *da,
1224                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1225                          u32 tx_flags)
1226 {
1227         struct ieee80211_local *local = sdata->local;
1228         struct sk_buff *skb;
1229         struct ieee80211_mgmt *mgmt;
1230         int err;
1231
1232         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1233         skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
1234                             24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
1235         if (!skb)
1236                 return;
1237
1238         skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
1239
1240         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1241         memset(mgmt, 0, 24 + 6);
1242         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1243                                           IEEE80211_STYPE_AUTH);
1244         memcpy(mgmt->da, da, ETH_ALEN);
1245         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1246         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1247         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1248         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1249         mgmt->u.auth.status_code = cpu_to_le16(status);
1250         if (extra)
1251                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1252
1253         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1254                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1255                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1256                 WARN_ON(err);
1257         }
1258
1259         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1260                                         tx_flags;
1261         ieee80211_tx_skb(sdata, skb);
1262 }
1263
1264 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1265                                     const u8 *bssid, u16 stype, u16 reason,
1266                                     bool send_frame, u8 *frame_buf)
1267 {
1268         struct ieee80211_local *local = sdata->local;
1269         struct sk_buff *skb;
1270         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1271
1272         /* build frame */
1273         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1274         mgmt->duration = 0; /* initialize only */
1275         mgmt->seq_ctrl = 0; /* initialize only */
1276         memcpy(mgmt->da, bssid, ETH_ALEN);
1277         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1278         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1279         /* u.deauth.reason_code == u.disassoc.reason_code */
1280         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1281
1282         if (send_frame) {
1283                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1284                                     IEEE80211_DEAUTH_FRAME_LEN);
1285                 if (!skb)
1286                         return;
1287
1288                 skb_reserve(skb, local->hw.extra_tx_headroom);
1289
1290                 /* copy in frame */
1291                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1292                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1293
1294                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1295                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1296                         IEEE80211_SKB_CB(skb)->flags |=
1297                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1298
1299                 ieee80211_tx_skb(sdata, skb);
1300         }
1301 }
1302
1303 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
1304                                          u8 *buffer, size_t buffer_len,
1305                                          const u8 *ie, size_t ie_len,
1306                                          enum nl80211_band band,
1307                                          u32 rate_mask,
1308                                          struct cfg80211_chan_def *chandef,
1309                                          size_t *offset)
1310 {
1311         struct ieee80211_supported_band *sband;
1312         u8 *pos = buffer, *end = buffer + buffer_len;
1313         size_t noffset;
1314         int supp_rates_len, i;
1315         u8 rates[32];
1316         int num_rates;
1317         int ext_rates_len;
1318         int shift;
1319         u32 rate_flags;
1320         bool have_80mhz = false;
1321
1322         *offset = 0;
1323
1324         sband = local->hw.wiphy->bands[band];
1325         if (WARN_ON_ONCE(!sband))
1326                 return 0;
1327
1328         rate_flags = ieee80211_chandef_rate_flags(chandef);
1329         shift = ieee80211_chandef_get_shift(chandef);
1330
1331         num_rates = 0;
1332         for (i = 0; i < sband->n_bitrates; i++) {
1333                 if ((BIT(i) & rate_mask) == 0)
1334                         continue; /* skip rate */
1335                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1336                         continue;
1337
1338                 rates[num_rates++] =
1339                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1340                                           (1 << shift) * 5);
1341         }
1342
1343         supp_rates_len = min_t(int, num_rates, 8);
1344
1345         if (end - pos < 2 + supp_rates_len)
1346                 goto out_err;
1347         *pos++ = WLAN_EID_SUPP_RATES;
1348         *pos++ = supp_rates_len;
1349         memcpy(pos, rates, supp_rates_len);
1350         pos += supp_rates_len;
1351
1352         /* insert "request information" if in custom IEs */
1353         if (ie && ie_len) {
1354                 static const u8 before_extrates[] = {
1355                         WLAN_EID_SSID,
1356                         WLAN_EID_SUPP_RATES,
1357                         WLAN_EID_REQUEST,
1358                 };
1359                 noffset = ieee80211_ie_split(ie, ie_len,
1360                                              before_extrates,
1361                                              ARRAY_SIZE(before_extrates),
1362                                              *offset);
1363                 if (end - pos < noffset - *offset)
1364                         goto out_err;
1365                 memcpy(pos, ie + *offset, noffset - *offset);
1366                 pos += noffset - *offset;
1367                 *offset = noffset;
1368         }
1369
1370         ext_rates_len = num_rates - supp_rates_len;
1371         if (ext_rates_len > 0) {
1372                 if (end - pos < 2 + ext_rates_len)
1373                         goto out_err;
1374                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1375                 *pos++ = ext_rates_len;
1376                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1377                 pos += ext_rates_len;
1378         }
1379
1380         if (chandef->chan && sband->band == NL80211_BAND_2GHZ) {
1381                 if (end - pos < 3)
1382                         goto out_err;
1383                 *pos++ = WLAN_EID_DS_PARAMS;
1384                 *pos++ = 1;
1385                 *pos++ = ieee80211_frequency_to_channel(
1386                                 chandef->chan->center_freq);
1387         }
1388
1389         /* insert custom IEs that go before HT */
1390         if (ie && ie_len) {
1391                 static const u8 before_ht[] = {
1392                         WLAN_EID_SSID,
1393                         WLAN_EID_SUPP_RATES,
1394                         WLAN_EID_REQUEST,
1395                         WLAN_EID_EXT_SUPP_RATES,
1396                         WLAN_EID_DS_PARAMS,
1397                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1398                 };
1399                 noffset = ieee80211_ie_split(ie, ie_len,
1400                                              before_ht, ARRAY_SIZE(before_ht),
1401                                              *offset);
1402                 if (end - pos < noffset - *offset)
1403                         goto out_err;
1404                 memcpy(pos, ie + *offset, noffset - *offset);
1405                 pos += noffset - *offset;
1406                 *offset = noffset;
1407         }
1408
1409         if (sband->ht_cap.ht_supported) {
1410                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1411                         goto out_err;
1412                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1413                                                 sband->ht_cap.cap);
1414         }
1415
1416         /*
1417          * If adding more here, adjust code in main.c
1418          * that calculates local->scan_ies_len.
1419          */
1420
1421         /* insert custom IEs that go before VHT */
1422         if (ie && ie_len) {
1423                 static const u8 before_vht[] = {
1424                         WLAN_EID_SSID,
1425                         WLAN_EID_SUPP_RATES,
1426                         WLAN_EID_REQUEST,
1427                         WLAN_EID_EXT_SUPP_RATES,
1428                         WLAN_EID_DS_PARAMS,
1429                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1430                         WLAN_EID_HT_CAPABILITY,
1431                         WLAN_EID_BSS_COEX_2040,
1432                         WLAN_EID_EXT_CAPABILITY,
1433                         WLAN_EID_SSID_LIST,
1434                         WLAN_EID_CHANNEL_USAGE,
1435                         WLAN_EID_INTERWORKING,
1436                         /* mesh ID can't happen here */
1437                         /* 60 GHz can't happen here right now */
1438                 };
1439                 noffset = ieee80211_ie_split(ie, ie_len,
1440                                              before_vht, ARRAY_SIZE(before_vht),
1441                                              *offset);
1442                 if (end - pos < noffset - *offset)
1443                         goto out_err;
1444                 memcpy(pos, ie + *offset, noffset - *offset);
1445                 pos += noffset - *offset;
1446                 *offset = noffset;
1447         }
1448
1449         /* Check if any channel in this sband supports at least 80 MHz */
1450         for (i = 0; i < sband->n_channels; i++) {
1451                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
1452                                                 IEEE80211_CHAN_NO_80MHZ))
1453                         continue;
1454
1455                 have_80mhz = true;
1456                 break;
1457         }
1458
1459         if (sband->vht_cap.vht_supported && have_80mhz) {
1460                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1461                         goto out_err;
1462                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1463                                                  sband->vht_cap.cap);
1464         }
1465
1466         return pos - buffer;
1467  out_err:
1468         WARN_ONCE(1, "not enough space for preq IEs\n");
1469         return pos - buffer;
1470 }
1471
1472 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1473                              size_t buffer_len,
1474                              struct ieee80211_scan_ies *ie_desc,
1475                              const u8 *ie, size_t ie_len,
1476                              u8 bands_used, u32 *rate_masks,
1477                              struct cfg80211_chan_def *chandef)
1478 {
1479         size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
1480         int i;
1481
1482         memset(ie_desc, 0, sizeof(*ie_desc));
1483
1484         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1485                 if (bands_used & BIT(i)) {
1486                         pos += ieee80211_build_preq_ies_band(local,
1487                                                              buffer + pos,
1488                                                              buffer_len - pos,
1489                                                              ie, ie_len, i,
1490                                                              rate_masks[i],
1491                                                              chandef,
1492                                                              &custom_ie_offset);
1493                         ie_desc->ies[i] = buffer + old_pos;
1494                         ie_desc->len[i] = pos - old_pos;
1495                         old_pos = pos;
1496                 }
1497         }
1498
1499         /* add any remaining custom IEs */
1500         if (ie && ie_len) {
1501                 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
1502                               "not enough space for preq custom IEs\n"))
1503                         return pos;
1504                 memcpy(buffer + pos, ie + custom_ie_offset,
1505                        ie_len - custom_ie_offset);
1506                 ie_desc->common_ies = buffer + pos;
1507                 ie_desc->common_ie_len = ie_len - custom_ie_offset;
1508                 pos += ie_len - custom_ie_offset;
1509         }
1510
1511         return pos;
1512 };
1513
1514 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1515                                           const u8 *src, const u8 *dst,
1516                                           u32 ratemask,
1517                                           struct ieee80211_channel *chan,
1518                                           const u8 *ssid, size_t ssid_len,
1519                                           const u8 *ie, size_t ie_len,
1520                                           bool directed)
1521 {
1522         struct ieee80211_local *local = sdata->local;
1523         struct cfg80211_chan_def chandef;
1524         struct sk_buff *skb;
1525         struct ieee80211_mgmt *mgmt;
1526         int ies_len;
1527         u32 rate_masks[NUM_NL80211_BANDS] = {};
1528         struct ieee80211_scan_ies dummy_ie_desc;
1529
1530         /*
1531          * Do not send DS Channel parameter for directed probe requests
1532          * in order to maximize the chance that we get a response.  Some
1533          * badly-behaved APs don't respond when this parameter is included.
1534          */
1535         chandef.width = sdata->vif.bss_conf.chandef.width;
1536         if (directed)
1537                 chandef.chan = NULL;
1538         else
1539                 chandef.chan = chan;
1540
1541         skb = ieee80211_probereq_get(&local->hw, src, ssid, ssid_len,
1542                                      100 + ie_len);
1543         if (!skb)
1544                 return NULL;
1545
1546         rate_masks[chan->band] = ratemask;
1547         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1548                                            skb_tailroom(skb), &dummy_ie_desc,
1549                                            ie, ie_len, BIT(chan->band),
1550                                            rate_masks, &chandef);
1551         skb_put(skb, ies_len);
1552
1553         if (dst) {
1554                 mgmt = (struct ieee80211_mgmt *) skb->data;
1555                 memcpy(mgmt->da, dst, ETH_ALEN);
1556                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1557         }
1558
1559         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1560
1561         return skb;
1562 }
1563
1564 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata,
1565                               const u8 *src, const u8 *dst,
1566                               const u8 *ssid, size_t ssid_len,
1567                               const u8 *ie, size_t ie_len,
1568                               u32 ratemask, bool directed, u32 tx_flags,
1569                               struct ieee80211_channel *channel, bool scan)
1570 {
1571         struct sk_buff *skb;
1572
1573         skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
1574                                         ssid, ssid_len,
1575                                         ie, ie_len, directed);
1576         if (skb) {
1577                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1578                 if (scan)
1579                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1580                 else
1581                         ieee80211_tx_skb(sdata, skb);
1582         }
1583 }
1584
1585 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1586                             struct ieee802_11_elems *elems,
1587                             enum nl80211_band band, u32 *basic_rates)
1588 {
1589         struct ieee80211_supported_band *sband;
1590         size_t num_rates;
1591         u32 supp_rates, rate_flags;
1592         int i, j, shift;
1593         sband = sdata->local->hw.wiphy->bands[band];
1594
1595         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1596         shift = ieee80211_vif_get_shift(&sdata->vif);
1597
1598         if (WARN_ON(!sband))
1599                 return 1;
1600
1601         num_rates = sband->n_bitrates;
1602         supp_rates = 0;
1603         for (i = 0; i < elems->supp_rates_len +
1604                      elems->ext_supp_rates_len; i++) {
1605                 u8 rate = 0;
1606                 int own_rate;
1607                 bool is_basic;
1608                 if (i < elems->supp_rates_len)
1609                         rate = elems->supp_rates[i];
1610                 else if (elems->ext_supp_rates)
1611                         rate = elems->ext_supp_rates
1612                                 [i - elems->supp_rates_len];
1613                 own_rate = 5 * (rate & 0x7f);
1614                 is_basic = !!(rate & 0x80);
1615
1616                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1617                         continue;
1618
1619                 for (j = 0; j < num_rates; j++) {
1620                         int brate;
1621                         if ((rate_flags & sband->bitrates[j].flags)
1622                             != rate_flags)
1623                                 continue;
1624
1625                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1626                                              1 << shift);
1627
1628                         if (brate == own_rate) {
1629                                 supp_rates |= BIT(j);
1630                                 if (basic_rates && is_basic)
1631                                         *basic_rates |= BIT(j);
1632                         }
1633                 }
1634         }
1635         return supp_rates;
1636 }
1637
1638 void ieee80211_stop_device(struct ieee80211_local *local)
1639 {
1640         ieee80211_led_radio(local, false);
1641         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1642
1643         cancel_work_sync(&local->reconfig_filter);
1644
1645         flush_workqueue(local->workqueue);
1646         drv_stop(local);
1647 }
1648
1649 static void ieee80211_flush_completed_scan(struct ieee80211_local *local,
1650                                            bool aborted)
1651 {
1652         /* It's possible that we don't handle the scan completion in
1653          * time during suspend, so if it's still marked as completed
1654          * here, queue the work and flush it to clean things up.
1655          * Instead of calling the worker function directly here, we
1656          * really queue it to avoid potential races with other flows
1657          * scheduling the same work.
1658          */
1659         if (test_bit(SCAN_COMPLETED, &local->scanning)) {
1660                 /* If coming from reconfiguration failure, abort the scan so
1661                  * we don't attempt to continue a partial HW scan - which is
1662                  * possible otherwise if (e.g.) the 2.4 GHz portion was the
1663                  * completed scan, and a 5 GHz portion is still pending.
1664                  */
1665                 if (aborted)
1666                         set_bit(SCAN_ABORTED, &local->scanning);
1667                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
1668                 flush_delayed_work(&local->scan_work);
1669         }
1670 }
1671
1672 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1673 {
1674         struct ieee80211_sub_if_data *sdata;
1675         struct ieee80211_chanctx *ctx;
1676
1677         /*
1678          * We get here if during resume the device can't be restarted properly.
1679          * We might also get here if this happens during HW reset, which is a
1680          * slightly different situation and we need to drop all connections in
1681          * the latter case.
1682          *
1683          * Ask cfg80211 to turn off all interfaces, this will result in more
1684          * warnings but at least we'll then get into a clean stopped state.
1685          */
1686
1687         local->resuming = false;
1688         local->suspended = false;
1689         local->in_reconfig = false;
1690
1691         ieee80211_flush_completed_scan(local, true);
1692
1693         /* scheduled scan clearly can't be running any more, but tell
1694          * cfg80211 and clear local state
1695          */
1696         ieee80211_sched_scan_end(local);
1697
1698         list_for_each_entry(sdata, &local->interfaces, list)
1699                 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1700
1701         /* Mark channel contexts as not being in the driver any more to avoid
1702          * removing them from the driver during the shutdown process...
1703          */
1704         mutex_lock(&local->chanctx_mtx);
1705         list_for_each_entry(ctx, &local->chanctx_list, list)
1706                 ctx->driver_present = false;
1707         mutex_unlock(&local->chanctx_mtx);
1708
1709         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1710 }
1711
1712 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1713                                      struct ieee80211_sub_if_data *sdata)
1714 {
1715         struct ieee80211_chanctx_conf *conf;
1716         struct ieee80211_chanctx *ctx;
1717
1718         if (!local->use_chanctx)
1719                 return;
1720
1721         mutex_lock(&local->chanctx_mtx);
1722         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1723                                          lockdep_is_held(&local->chanctx_mtx));
1724         if (conf) {
1725                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1726                 drv_assign_vif_chanctx(local, sdata, ctx);
1727         }
1728         mutex_unlock(&local->chanctx_mtx);
1729 }
1730
1731 static void ieee80211_reconfig_stations(struct ieee80211_sub_if_data *sdata)
1732 {
1733         struct ieee80211_local *local = sdata->local;
1734         struct sta_info *sta;
1735
1736         /* add STAs back */
1737         mutex_lock(&local->sta_mtx);
1738         list_for_each_entry(sta, &local->sta_list, list) {
1739                 enum ieee80211_sta_state state;
1740
1741                 if (!sta->uploaded || sta->sdata != sdata)
1742                         continue;
1743
1744                 for (state = IEEE80211_STA_NOTEXIST;
1745                      state < sta->sta_state; state++)
1746                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1747                                               state + 1));
1748         }
1749         mutex_unlock(&local->sta_mtx);
1750 }
1751
1752 static int ieee80211_reconfig_nan(struct ieee80211_sub_if_data *sdata)
1753 {
1754         struct cfg80211_nan_func *func, **funcs;
1755         int res, id, i = 0;
1756
1757         res = drv_start_nan(sdata->local, sdata,
1758                             &sdata->u.nan.conf);
1759         if (WARN_ON(res))
1760                 return res;
1761
1762         funcs = kzalloc((sdata->local->hw.max_nan_de_entries + 1) *
1763                         sizeof(*funcs), GFP_KERNEL);
1764         if (!funcs)
1765                 return -ENOMEM;
1766
1767         /* Add all the functions:
1768          * This is a little bit ugly. We need to call a potentially sleeping
1769          * callback for each NAN function, so we can't hold the spinlock.
1770          */
1771         spin_lock_bh(&sdata->u.nan.func_lock);
1772
1773         idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, id)
1774                 funcs[i++] = func;
1775
1776         spin_unlock_bh(&sdata->u.nan.func_lock);
1777
1778         for (i = 0; funcs[i]; i++) {
1779                 res = drv_add_nan_func(sdata->local, sdata, funcs[i]);
1780                 if (WARN_ON(res))
1781                         ieee80211_nan_func_terminated(&sdata->vif,
1782                                                       funcs[i]->instance_id,
1783                                                       NL80211_NAN_FUNC_TERM_REASON_ERROR,
1784                                                       GFP_KERNEL);
1785         }
1786
1787         kfree(funcs);
1788
1789         return 0;
1790 }
1791
1792 int ieee80211_reconfig(struct ieee80211_local *local)
1793 {
1794         struct ieee80211_hw *hw = &local->hw;
1795         struct ieee80211_sub_if_data *sdata;
1796         struct ieee80211_chanctx *ctx;
1797         struct sta_info *sta;
1798         int res, i;
1799         bool reconfig_due_to_wowlan = false;
1800         struct ieee80211_sub_if_data *sched_scan_sdata;
1801         struct cfg80211_sched_scan_request *sched_scan_req;
1802         bool sched_scan_stopped = false;
1803         bool suspended = local->suspended;
1804
1805         /* nothing to do if HW shouldn't run */
1806         if (!local->open_count)
1807                 goto wake_up;
1808
1809 #ifdef CONFIG_PM
1810         if (suspended)
1811                 local->resuming = true;
1812
1813         if (local->wowlan) {
1814                 /*
1815                  * In the wowlan case, both mac80211 and the device
1816                  * are functional when the resume op is called, so
1817                  * clear local->suspended so the device could operate
1818                  * normally (e.g. pass rx frames).
1819                  */
1820                 local->suspended = false;
1821                 res = drv_resume(local);
1822                 local->wowlan = false;
1823                 if (res < 0) {
1824                         local->resuming = false;
1825                         return res;
1826                 }
1827                 if (res == 0)
1828                         goto wake_up;
1829                 WARN_ON(res > 1);
1830                 /*
1831                  * res is 1, which means the driver requested
1832                  * to go through a regular reset on wakeup.
1833                  * restore local->suspended in this case.
1834                  */
1835                 reconfig_due_to_wowlan = true;
1836                 local->suspended = true;
1837         }
1838 #endif
1839
1840         /*
1841          * In case of hw_restart during suspend (without wowlan),
1842          * cancel restart work, as we are reconfiguring the device
1843          * anyway.
1844          * Note that restart_work is scheduled on a frozen workqueue,
1845          * so we can't deadlock in this case.
1846          */
1847         if (suspended && local->in_reconfig && !reconfig_due_to_wowlan)
1848                 cancel_work_sync(&local->restart_work);
1849
1850         local->started = false;
1851
1852         /*
1853          * Upon resume hardware can sometimes be goofy due to
1854          * various platform / driver / bus issues, so restarting
1855          * the device may at times not work immediately. Propagate
1856          * the error.
1857          */
1858         res = drv_start(local);
1859         if (res) {
1860                 if (suspended)
1861                         WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1862                 else
1863                         WARN(1, "Hardware became unavailable during restart.\n");
1864                 ieee80211_handle_reconfig_failure(local);
1865                 return res;
1866         }
1867
1868         /* setup fragmentation threshold */
1869         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1870
1871         /* setup RTS threshold */
1872         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1873
1874         /* reset coverage class */
1875         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1876
1877         ieee80211_led_radio(local, true);
1878         ieee80211_mod_tpt_led_trig(local,
1879                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1880
1881         /* add interfaces */
1882         sdata = rtnl_dereference(local->monitor_sdata);
1883         if (sdata) {
1884                 /* in HW restart it exists already */
1885                 WARN_ON(local->resuming);
1886                 res = drv_add_interface(local, sdata);
1887                 if (WARN_ON(res)) {
1888                         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1889                         synchronize_net();
1890                         kfree(sdata);
1891                 }
1892         }
1893
1894         list_for_each_entry(sdata, &local->interfaces, list) {
1895                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1896                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1897                     ieee80211_sdata_running(sdata)) {
1898                         res = drv_add_interface(local, sdata);
1899                         if (WARN_ON(res))
1900                                 break;
1901                 }
1902         }
1903
1904         /* If adding any of the interfaces failed above, roll back and
1905          * report failure.
1906          */
1907         if (res) {
1908                 list_for_each_entry_continue_reverse(sdata, &local->interfaces,
1909                                                      list)
1910                         if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1911                             sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1912                             ieee80211_sdata_running(sdata))
1913                                 drv_remove_interface(local, sdata);
1914                 ieee80211_handle_reconfig_failure(local);
1915                 return res;
1916         }
1917
1918         /* add channel contexts */
1919         if (local->use_chanctx) {
1920                 mutex_lock(&local->chanctx_mtx);
1921                 list_for_each_entry(ctx, &local->chanctx_list, list)
1922                         if (ctx->replace_state !=
1923                             IEEE80211_CHANCTX_REPLACES_OTHER)
1924                                 WARN_ON(drv_add_chanctx(local, ctx));
1925                 mutex_unlock(&local->chanctx_mtx);
1926
1927                 sdata = rtnl_dereference(local->monitor_sdata);
1928                 if (sdata && ieee80211_sdata_running(sdata))
1929                         ieee80211_assign_chanctx(local, sdata);
1930         }
1931
1932         /* reconfigure hardware */
1933         ieee80211_hw_config(local, ~0);
1934
1935         ieee80211_configure_filter(local);
1936
1937         /* Finally also reconfigure all the BSS information */
1938         list_for_each_entry(sdata, &local->interfaces, list) {
1939                 u32 changed;
1940
1941                 if (!ieee80211_sdata_running(sdata))
1942                         continue;
1943
1944                 ieee80211_assign_chanctx(local, sdata);
1945
1946                 switch (sdata->vif.type) {
1947                 case NL80211_IFTYPE_AP_VLAN:
1948                 case NL80211_IFTYPE_MONITOR:
1949                         break;
1950                 default:
1951                         ieee80211_reconfig_stations(sdata);
1952                         /* fall through */
1953                 case NL80211_IFTYPE_AP: /* AP stations are handled later */
1954                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1955                                 drv_conf_tx(local, sdata, i,
1956                                             &sdata->tx_conf[i]);
1957                         break;
1958                 }
1959
1960                 /* common change flags for all interface types */
1961                 changed = BSS_CHANGED_ERP_CTS_PROT |
1962                           BSS_CHANGED_ERP_PREAMBLE |
1963                           BSS_CHANGED_ERP_SLOT |
1964                           BSS_CHANGED_HT |
1965                           BSS_CHANGED_BASIC_RATES |
1966                           BSS_CHANGED_BEACON_INT |
1967                           BSS_CHANGED_BSSID |
1968                           BSS_CHANGED_CQM |
1969                           BSS_CHANGED_QOS |
1970                           BSS_CHANGED_IDLE |
1971                           BSS_CHANGED_TXPOWER;
1972
1973                 if (sdata->vif.mu_mimo_owner)
1974                         changed |= BSS_CHANGED_MU_GROUPS;
1975
1976                 switch (sdata->vif.type) {
1977                 case NL80211_IFTYPE_STATION:
1978                         changed |= BSS_CHANGED_ASSOC |
1979                                    BSS_CHANGED_ARP_FILTER |
1980                                    BSS_CHANGED_PS;
1981
1982                         /* Re-send beacon info report to the driver */
1983                         if (sdata->u.mgd.have_beacon)
1984                                 changed |= BSS_CHANGED_BEACON_INFO;
1985
1986                         sdata_lock(sdata);
1987                         ieee80211_bss_info_change_notify(sdata, changed);
1988                         sdata_unlock(sdata);
1989                         break;
1990                 case NL80211_IFTYPE_OCB:
1991                         changed |= BSS_CHANGED_OCB;
1992                         ieee80211_bss_info_change_notify(sdata, changed);
1993                         break;
1994                 case NL80211_IFTYPE_ADHOC:
1995                         changed |= BSS_CHANGED_IBSS;
1996                         /* fall through */
1997                 case NL80211_IFTYPE_AP:
1998                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1999
2000                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
2001                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
2002
2003                                 if (rcu_access_pointer(sdata->u.ap.beacon))
2004                                         drv_start_ap(local, sdata);
2005                         }
2006
2007                         /* fall through */
2008                 case NL80211_IFTYPE_MESH_POINT:
2009                         if (sdata->vif.bss_conf.enable_beacon) {
2010                                 changed |= BSS_CHANGED_BEACON |
2011                                            BSS_CHANGED_BEACON_ENABLED;
2012                                 ieee80211_bss_info_change_notify(sdata, changed);
2013                         }
2014                         break;
2015                 case NL80211_IFTYPE_NAN:
2016                         res = ieee80211_reconfig_nan(sdata);
2017                         if (res < 0) {
2018                                 ieee80211_handle_reconfig_failure(local);
2019                                 return res;
2020                         }
2021                         break;
2022                 case NL80211_IFTYPE_WDS:
2023                 case NL80211_IFTYPE_AP_VLAN:
2024                 case NL80211_IFTYPE_MONITOR:
2025                 case NL80211_IFTYPE_P2P_DEVICE:
2026                         /* nothing to do */
2027                         break;
2028                 case NL80211_IFTYPE_UNSPECIFIED:
2029                 case NUM_NL80211_IFTYPES:
2030                 case NL80211_IFTYPE_P2P_CLIENT:
2031                 case NL80211_IFTYPE_P2P_GO:
2032                         WARN_ON(1);
2033                         break;
2034                 }
2035         }
2036
2037         ieee80211_recalc_ps(local);
2038
2039         /*
2040          * The sta might be in psm against the ap (e.g. because
2041          * this was the state before a hw restart), so we
2042          * explicitly send a null packet in order to make sure
2043          * it'll sync against the ap (and get out of psm).
2044          */
2045         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
2046                 list_for_each_entry(sdata, &local->interfaces, list) {
2047                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2048                                 continue;
2049                         if (!sdata->u.mgd.associated)
2050                                 continue;
2051
2052                         ieee80211_send_nullfunc(local, sdata, false);
2053                 }
2054         }
2055
2056         /* APs are now beaconing, add back stations */
2057         mutex_lock(&local->sta_mtx);
2058         list_for_each_entry(sta, &local->sta_list, list) {
2059                 enum ieee80211_sta_state state;
2060
2061                 if (!sta->uploaded)
2062                         continue;
2063
2064                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
2065                         continue;
2066
2067                 for (state = IEEE80211_STA_NOTEXIST;
2068                      state < sta->sta_state; state++)
2069                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
2070                                               state + 1));
2071         }
2072         mutex_unlock(&local->sta_mtx);
2073
2074         /* add back keys */
2075         list_for_each_entry(sdata, &local->interfaces, list)
2076                 ieee80211_reset_crypto_tx_tailroom(sdata);
2077
2078         list_for_each_entry(sdata, &local->interfaces, list)
2079                 if (ieee80211_sdata_running(sdata))
2080                         ieee80211_enable_keys(sdata);
2081
2082         /* Reconfigure sched scan if it was interrupted by FW restart */
2083         mutex_lock(&local->mtx);
2084         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
2085                                                 lockdep_is_held(&local->mtx));
2086         sched_scan_req = rcu_dereference_protected(local->sched_scan_req,
2087                                                 lockdep_is_held(&local->mtx));
2088         if (sched_scan_sdata && sched_scan_req)
2089                 /*
2090                  * Sched scan stopped, but we don't want to report it. Instead,
2091                  * we're trying to reschedule. However, if more than one scan
2092                  * plan was set, we cannot reschedule since we don't know which
2093                  * scan plan was currently running (and some scan plans may have
2094                  * already finished).
2095                  */
2096                 if (sched_scan_req->n_scan_plans > 1 ||
2097                     __ieee80211_request_sched_scan_start(sched_scan_sdata,
2098                                                          sched_scan_req)) {
2099                         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
2100                         RCU_INIT_POINTER(local->sched_scan_req, NULL);
2101                         sched_scan_stopped = true;
2102                 }
2103         mutex_unlock(&local->mtx);
2104
2105         if (sched_scan_stopped)
2106                 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
2107
2108  wake_up:
2109         if (local->in_reconfig) {
2110                 local->in_reconfig = false;
2111                 barrier();
2112
2113                 /* Restart deferred ROCs */
2114                 mutex_lock(&local->mtx);
2115                 ieee80211_start_next_roc(local);
2116                 mutex_unlock(&local->mtx);
2117         }
2118
2119         if (local->monitors == local->open_count && local->monitors > 0)
2120                 ieee80211_add_virtual_monitor(local);
2121
2122         /*
2123          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
2124          * sessions can be established after a resume.
2125          *
2126          * Also tear down aggregation sessions since reconfiguring
2127          * them in a hardware restart scenario is not easily done
2128          * right now, and the hardware will have lost information
2129          * about the sessions, but we and the AP still think they
2130          * are active. This is really a workaround though.
2131          */
2132         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
2133                 mutex_lock(&local->sta_mtx);
2134
2135                 list_for_each_entry(sta, &local->sta_list, list) {
2136                         if (!local->resuming)
2137                                 ieee80211_sta_tear_down_BA_sessions(
2138                                                 sta, AGG_STOP_LOCAL_REQUEST);
2139                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
2140                 }
2141
2142                 mutex_unlock(&local->sta_mtx);
2143         }
2144
2145         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
2146                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
2147                                         false);
2148
2149         /*
2150          * If this is for hw restart things are still running.
2151          * We may want to change that later, however.
2152          */
2153         if (local->open_count && (!suspended || reconfig_due_to_wowlan))
2154                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_RESTART);
2155
2156         if (!suspended)
2157                 return 0;
2158
2159 #ifdef CONFIG_PM
2160         /* first set suspended false, then resuming */
2161         local->suspended = false;
2162         mb();
2163         local->resuming = false;
2164
2165         ieee80211_flush_completed_scan(local, false);
2166
2167         if (local->open_count && !reconfig_due_to_wowlan)
2168                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_SUSPEND);
2169
2170         list_for_each_entry(sdata, &local->interfaces, list) {
2171                 if (!ieee80211_sdata_running(sdata))
2172                         continue;
2173                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2174                         ieee80211_sta_restart(sdata);
2175         }
2176
2177         mod_timer(&local->sta_cleanup, jiffies + 1);
2178 #else
2179         WARN_ON(1);
2180 #endif
2181
2182         return 0;
2183 }
2184
2185 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
2186 {
2187         struct ieee80211_sub_if_data *sdata;
2188         struct ieee80211_local *local;
2189         struct ieee80211_key *key;
2190
2191         if (WARN_ON(!vif))
2192                 return;
2193
2194         sdata = vif_to_sdata(vif);
2195         local = sdata->local;
2196
2197         if (WARN_ON(!local->resuming))
2198                 return;
2199
2200         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2201                 return;
2202
2203         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
2204
2205         mutex_lock(&local->key_mtx);
2206         list_for_each_entry(key, &sdata->key_list, list)
2207                 key->flags |= KEY_FLAG_TAINTED;
2208         mutex_unlock(&local->key_mtx);
2209 }
2210 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
2211
2212 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
2213 {
2214         struct ieee80211_local *local = sdata->local;
2215         struct ieee80211_chanctx_conf *chanctx_conf;
2216         struct ieee80211_chanctx *chanctx;
2217
2218         mutex_lock(&local->chanctx_mtx);
2219
2220         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2221                                         lockdep_is_held(&local->chanctx_mtx));
2222
2223         /*
2224          * This function can be called from a work, thus it may be possible
2225          * that the chanctx_conf is removed (due to a disconnection, for
2226          * example).
2227          * So nothing should be done in such case.
2228          */
2229         if (!chanctx_conf)
2230                 goto unlock;
2231
2232         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2233         ieee80211_recalc_smps_chanctx(local, chanctx);
2234  unlock:
2235         mutex_unlock(&local->chanctx_mtx);
2236 }
2237
2238 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
2239 {
2240         struct ieee80211_local *local = sdata->local;
2241         struct ieee80211_chanctx_conf *chanctx_conf;
2242         struct ieee80211_chanctx *chanctx;
2243
2244         mutex_lock(&local->chanctx_mtx);
2245
2246         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2247                                         lockdep_is_held(&local->chanctx_mtx));
2248
2249         if (WARN_ON_ONCE(!chanctx_conf))
2250                 goto unlock;
2251
2252         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2253         ieee80211_recalc_chanctx_min_def(local, chanctx);
2254  unlock:
2255         mutex_unlock(&local->chanctx_mtx);
2256 }
2257
2258 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
2259 {
2260         size_t pos = offset;
2261
2262         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
2263                 pos += 2 + ies[pos + 1];
2264
2265         return pos;
2266 }
2267
2268 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
2269                                             int rssi_min_thold,
2270                                             int rssi_max_thold)
2271 {
2272         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
2273
2274         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2275                 return;
2276
2277         /*
2278          * Scale up threshold values before storing it, as the RSSI averaging
2279          * algorithm uses a scaled up value as well. Change this scaling
2280          * factor if the RSSI averaging algorithm changes.
2281          */
2282         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
2283         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
2284 }
2285
2286 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
2287                                     int rssi_min_thold,
2288                                     int rssi_max_thold)
2289 {
2290         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2291
2292         WARN_ON(rssi_min_thold == rssi_max_thold ||
2293                 rssi_min_thold > rssi_max_thold);
2294
2295         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2296                                        rssi_max_thold);
2297 }
2298 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2299
2300 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2301 {
2302         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2303
2304         _ieee80211_enable_rssi_reports(sdata, 0, 0);
2305 }
2306 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2307
2308 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2309                               u16 cap)
2310 {
2311         __le16 tmp;
2312
2313         *pos++ = WLAN_EID_HT_CAPABILITY;
2314         *pos++ = sizeof(struct ieee80211_ht_cap);
2315         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2316
2317         /* capability flags */
2318         tmp = cpu_to_le16(cap);
2319         memcpy(pos, &tmp, sizeof(u16));
2320         pos += sizeof(u16);
2321
2322         /* AMPDU parameters */
2323         *pos++ = ht_cap->ampdu_factor |
2324                  (ht_cap->ampdu_density <<
2325                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2326
2327         /* MCS set */
2328         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2329         pos += sizeof(ht_cap->mcs);
2330
2331         /* extended capabilities */
2332         pos += sizeof(__le16);
2333
2334         /* BF capabilities */
2335         pos += sizeof(__le32);
2336
2337         /* antenna selection */
2338         pos += sizeof(u8);
2339
2340         return pos;
2341 }
2342
2343 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2344                                u32 cap)
2345 {
2346         __le32 tmp;
2347
2348         *pos++ = WLAN_EID_VHT_CAPABILITY;
2349         *pos++ = sizeof(struct ieee80211_vht_cap);
2350         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2351
2352         /* capability flags */
2353         tmp = cpu_to_le32(cap);
2354         memcpy(pos, &tmp, sizeof(u32));
2355         pos += sizeof(u32);
2356
2357         /* VHT MCS set */
2358         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2359         pos += sizeof(vht_cap->vht_mcs);
2360
2361         return pos;
2362 }
2363
2364 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2365                                const struct cfg80211_chan_def *chandef,
2366                                u16 prot_mode, bool rifs_mode)
2367 {
2368         struct ieee80211_ht_operation *ht_oper;
2369         /* Build HT Information */
2370         *pos++ = WLAN_EID_HT_OPERATION;
2371         *pos++ = sizeof(struct ieee80211_ht_operation);
2372         ht_oper = (struct ieee80211_ht_operation *)pos;
2373         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2374                                         chandef->chan->center_freq);
2375         switch (chandef->width) {
2376         case NL80211_CHAN_WIDTH_160:
2377         case NL80211_CHAN_WIDTH_80P80:
2378         case NL80211_CHAN_WIDTH_80:
2379         case NL80211_CHAN_WIDTH_40:
2380                 if (chandef->center_freq1 > chandef->chan->center_freq)
2381                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2382                 else
2383                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2384                 break;
2385         default:
2386                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2387                 break;
2388         }
2389         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2390             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2391             chandef->width != NL80211_CHAN_WIDTH_20)
2392                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2393
2394         if (rifs_mode)
2395                 ht_oper->ht_param |= IEEE80211_HT_PARAM_RIFS_MODE;
2396
2397         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2398         ht_oper->stbc_param = 0x0000;
2399
2400         /* It seems that Basic MCS set and Supported MCS set
2401            are identical for the first 10 bytes */
2402         memset(&ht_oper->basic_set, 0, 16);
2403         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2404
2405         return pos + sizeof(struct ieee80211_ht_operation);
2406 }
2407
2408 u8 *ieee80211_ie_build_vht_oper(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2409                                 const struct cfg80211_chan_def *chandef)
2410 {
2411         struct ieee80211_vht_operation *vht_oper;
2412
2413         *pos++ = WLAN_EID_VHT_OPERATION;
2414         *pos++ = sizeof(struct ieee80211_vht_operation);
2415         vht_oper = (struct ieee80211_vht_operation *)pos;
2416         vht_oper->center_freq_seg1_idx = ieee80211_frequency_to_channel(
2417                                                         chandef->center_freq1);
2418         if (chandef->center_freq2)
2419                 vht_oper->center_freq_seg2_idx =
2420                         ieee80211_frequency_to_channel(chandef->center_freq2);
2421         else
2422                 vht_oper->center_freq_seg2_idx = 0x00;
2423
2424         switch (chandef->width) {
2425         case NL80211_CHAN_WIDTH_160:
2426                 /*
2427                  * Convert 160 MHz channel width to new style as interop
2428                  * workaround.
2429                  */
2430                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2431                 vht_oper->center_freq_seg2_idx = vht_oper->center_freq_seg1_idx;
2432                 if (chandef->chan->center_freq < chandef->center_freq1)
2433                         vht_oper->center_freq_seg1_idx -= 8;
2434                 else
2435                         vht_oper->center_freq_seg1_idx += 8;
2436                 break;
2437         case NL80211_CHAN_WIDTH_80P80:
2438                 /*
2439                  * Convert 80+80 MHz channel width to new style as interop
2440                  * workaround.
2441                  */
2442                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2443                 break;
2444         case NL80211_CHAN_WIDTH_80:
2445                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2446                 break;
2447         default:
2448                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
2449                 break;
2450         }
2451
2452         /* don't require special VHT peer rates */
2453         vht_oper->basic_mcs_set = cpu_to_le16(0xffff);
2454
2455         return pos + sizeof(struct ieee80211_vht_operation);
2456 }
2457
2458 bool ieee80211_chandef_ht_oper(const struct ieee80211_ht_operation *ht_oper,
2459                                struct cfg80211_chan_def *chandef)
2460 {
2461         enum nl80211_channel_type channel_type;
2462
2463         if (!ht_oper)
2464                 return false;
2465
2466         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2467         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2468                 channel_type = NL80211_CHAN_HT20;
2469                 break;
2470         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2471                 channel_type = NL80211_CHAN_HT40PLUS;
2472                 break;
2473         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2474                 channel_type = NL80211_CHAN_HT40MINUS;
2475                 break;
2476         default:
2477                 channel_type = NL80211_CHAN_NO_HT;
2478                 return false;
2479         }
2480
2481         cfg80211_chandef_create(chandef, chandef->chan, channel_type);
2482         return true;
2483 }
2484
2485 bool ieee80211_chandef_vht_oper(const struct ieee80211_vht_operation *oper,
2486                                 struct cfg80211_chan_def *chandef)
2487 {
2488         struct cfg80211_chan_def new = *chandef;
2489         int cf1, cf2;
2490
2491         if (!oper)
2492                 return false;
2493
2494         cf1 = ieee80211_channel_to_frequency(oper->center_freq_seg1_idx,
2495                                              chandef->chan->band);
2496         cf2 = ieee80211_channel_to_frequency(oper->center_freq_seg2_idx,
2497                                              chandef->chan->band);
2498
2499         switch (oper->chan_width) {
2500         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2501                 break;
2502         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2503                 new.width = NL80211_CHAN_WIDTH_80;
2504                 new.center_freq1 = cf1;
2505                 /* If needed, adjust based on the newer interop workaround. */
2506                 if (oper->center_freq_seg2_idx) {
2507                         unsigned int diff;
2508
2509                         diff = abs(oper->center_freq_seg2_idx -
2510                                    oper->center_freq_seg1_idx);
2511                         if (diff == 8) {
2512                                 new.width = NL80211_CHAN_WIDTH_160;
2513                                 new.center_freq1 = cf2;
2514                         } else if (diff > 8) {
2515                                 new.width = NL80211_CHAN_WIDTH_80P80;
2516                                 new.center_freq2 = cf2;
2517                         }
2518                 }
2519                 break;
2520         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2521                 new.width = NL80211_CHAN_WIDTH_160;
2522                 new.center_freq1 = cf1;
2523                 break;
2524         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2525                 new.width = NL80211_CHAN_WIDTH_80P80;
2526                 new.center_freq1 = cf1;
2527                 new.center_freq2 = cf2;
2528                 break;
2529         default:
2530                 return false;
2531         }
2532
2533         if (!cfg80211_chandef_valid(&new))
2534                 return false;
2535
2536         *chandef = new;
2537         return true;
2538 }
2539
2540 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2541                              const struct ieee80211_supported_band *sband,
2542                              const u8 *srates, int srates_len, u32 *rates)
2543 {
2544         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2545         int shift = ieee80211_chandef_get_shift(chandef);
2546         struct ieee80211_rate *br;
2547         int brate, rate, i, j, count = 0;
2548
2549         *rates = 0;
2550
2551         for (i = 0; i < srates_len; i++) {
2552                 rate = srates[i] & 0x7f;
2553
2554                 for (j = 0; j < sband->n_bitrates; j++) {
2555                         br = &sband->bitrates[j];
2556                         if ((rate_flags & br->flags) != rate_flags)
2557                                 continue;
2558
2559                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2560                         if (brate == rate) {
2561                                 *rates |= BIT(j);
2562                                 count++;
2563                                 break;
2564                         }
2565                 }
2566         }
2567         return count;
2568 }
2569
2570 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2571                             struct sk_buff *skb, bool need_basic,
2572                             enum nl80211_band band)
2573 {
2574         struct ieee80211_local *local = sdata->local;
2575         struct ieee80211_supported_band *sband;
2576         int rate, shift;
2577         u8 i, rates, *pos;
2578         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2579         u32 rate_flags;
2580
2581         shift = ieee80211_vif_get_shift(&sdata->vif);
2582         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2583         sband = local->hw.wiphy->bands[band];
2584         rates = 0;
2585         for (i = 0; i < sband->n_bitrates; i++) {
2586                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2587                         continue;
2588                 rates++;
2589         }
2590         if (rates > 8)
2591                 rates = 8;
2592
2593         if (skb_tailroom(skb) < rates + 2)
2594                 return -ENOMEM;
2595
2596         pos = skb_put(skb, rates + 2);
2597         *pos++ = WLAN_EID_SUPP_RATES;
2598         *pos++ = rates;
2599         for (i = 0; i < rates; i++) {
2600                 u8 basic = 0;
2601                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2602                         continue;
2603
2604                 if (need_basic && basic_rates & BIT(i))
2605                         basic = 0x80;
2606                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2607                                     5 * (1 << shift));
2608                 *pos++ = basic | (u8) rate;
2609         }
2610
2611         return 0;
2612 }
2613
2614 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2615                                 struct sk_buff *skb, bool need_basic,
2616                                 enum nl80211_band band)
2617 {
2618         struct ieee80211_local *local = sdata->local;
2619         struct ieee80211_supported_band *sband;
2620         int rate, shift;
2621         u8 i, exrates, *pos;
2622         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2623         u32 rate_flags;
2624
2625         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2626         shift = ieee80211_vif_get_shift(&sdata->vif);
2627
2628         sband = local->hw.wiphy->bands[band];
2629         exrates = 0;
2630         for (i = 0; i < sband->n_bitrates; i++) {
2631                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2632                         continue;
2633                 exrates++;
2634         }
2635
2636         if (exrates > 8)
2637                 exrates -= 8;
2638         else
2639                 exrates = 0;
2640
2641         if (skb_tailroom(skb) < exrates + 2)
2642                 return -ENOMEM;
2643
2644         if (exrates) {
2645                 pos = skb_put(skb, exrates + 2);
2646                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2647                 *pos++ = exrates;
2648                 for (i = 8; i < sband->n_bitrates; i++) {
2649                         u8 basic = 0;
2650                         if ((rate_flags & sband->bitrates[i].flags)
2651                             != rate_flags)
2652                                 continue;
2653                         if (need_basic && basic_rates & BIT(i))
2654                                 basic = 0x80;
2655                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2656                                             5 * (1 << shift));
2657                         *pos++ = basic | (u8) rate;
2658                 }
2659         }
2660         return 0;
2661 }
2662
2663 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2664 {
2665         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2666         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2667
2668         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2669                 /* non-managed type inferfaces */
2670                 return 0;
2671         }
2672         return -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
2673 }
2674 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2675
2676 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2677 {
2678         if (!mcs)
2679                 return 1;
2680
2681         /* TODO: consider rx_highest */
2682
2683         if (mcs->rx_mask[3])
2684                 return 4;
2685         if (mcs->rx_mask[2])
2686                 return 3;
2687         if (mcs->rx_mask[1])
2688                 return 2;
2689         return 1;
2690 }
2691
2692 /**
2693  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2694  * @local: mac80211 hw info struct
2695  * @status: RX status
2696  * @mpdu_len: total MPDU length (including FCS)
2697  * @mpdu_offset: offset into MPDU to calculate timestamp at
2698  *
2699  * This function calculates the RX timestamp at the given MPDU offset, taking
2700  * into account what the RX timestamp was. An offset of 0 will just normalize
2701  * the timestamp to TSF at beginning of MPDU reception.
2702  */
2703 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2704                                      struct ieee80211_rx_status *status,
2705                                      unsigned int mpdu_len,
2706                                      unsigned int mpdu_offset)
2707 {
2708         u64 ts = status->mactime;
2709         struct rate_info ri;
2710         u16 rate;
2711
2712         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2713                 return 0;
2714
2715         memset(&ri, 0, sizeof(ri));
2716
2717         /* Fill cfg80211 rate info */
2718         if (status->flag & RX_FLAG_HT) {
2719                 ri.mcs = status->rate_idx;
2720                 ri.flags |= RATE_INFO_FLAGS_MCS;
2721                 if (status->flag & RX_FLAG_40MHZ)
2722                         ri.bw = RATE_INFO_BW_40;
2723                 else
2724                         ri.bw = RATE_INFO_BW_20;
2725                 if (status->flag & RX_FLAG_SHORT_GI)
2726                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2727         } else if (status->flag & RX_FLAG_VHT) {
2728                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2729                 ri.mcs = status->rate_idx;
2730                 ri.nss = status->vht_nss;
2731                 if (status->flag & RX_FLAG_40MHZ)
2732                         ri.bw = RATE_INFO_BW_40;
2733                 else if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2734                         ri.bw = RATE_INFO_BW_80;
2735                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2736                         ri.bw = RATE_INFO_BW_160;
2737                 else
2738                         ri.bw = RATE_INFO_BW_20;
2739                 if (status->flag & RX_FLAG_SHORT_GI)
2740                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2741         } else {
2742                 struct ieee80211_supported_band *sband;
2743                 int shift = 0;
2744                 int bitrate;
2745
2746                 if (status->flag & RX_FLAG_10MHZ) {
2747                         shift = 1;
2748                         ri.bw = RATE_INFO_BW_10;
2749                 } else if (status->flag & RX_FLAG_5MHZ) {
2750                         shift = 2;
2751                         ri.bw = RATE_INFO_BW_5;
2752                 } else {
2753                         ri.bw = RATE_INFO_BW_20;
2754                 }
2755
2756                 sband = local->hw.wiphy->bands[status->band];
2757                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2758                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2759
2760                 if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
2761                         /* TODO: handle HT/VHT preambles */
2762                         if (status->band == NL80211_BAND_5GHZ) {
2763                                 ts += 20 << shift;
2764                                 mpdu_offset += 2;
2765                         } else if (status->flag & RX_FLAG_SHORTPRE) {
2766                                 ts += 96;
2767                         } else {
2768                                 ts += 192;
2769                         }
2770                 }
2771         }
2772
2773         rate = cfg80211_calculate_bitrate(&ri);
2774         if (WARN_ONCE(!rate,
2775                       "Invalid bitrate: flags=0x%llx, idx=%d, vht_nss=%d\n",
2776                       (unsigned long long)status->flag, status->rate_idx,
2777                       status->vht_nss))
2778                 return 0;
2779
2780         /* rewind from end of MPDU */
2781         if (status->flag & RX_FLAG_MACTIME_END)
2782                 ts -= mpdu_len * 8 * 10 / rate;
2783
2784         ts += mpdu_offset * 8 * 10 / rate;
2785
2786         return ts;
2787 }
2788
2789 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2790 {
2791         struct ieee80211_sub_if_data *sdata;
2792         struct cfg80211_chan_def chandef;
2793
2794         mutex_lock(&local->mtx);
2795         mutex_lock(&local->iflist_mtx);
2796         list_for_each_entry(sdata, &local->interfaces, list) {
2797                 /* it might be waiting for the local->mtx, but then
2798                  * by the time it gets it, sdata->wdev.cac_started
2799                  * will no longer be true
2800                  */
2801                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2802
2803                 if (sdata->wdev.cac_started) {
2804                         chandef = sdata->vif.bss_conf.chandef;
2805                         ieee80211_vif_release_channel(sdata);
2806                         cfg80211_cac_event(sdata->dev,
2807                                            &chandef,
2808                                            NL80211_RADAR_CAC_ABORTED,
2809                                            GFP_KERNEL);
2810                 }
2811         }
2812         mutex_unlock(&local->iflist_mtx);
2813         mutex_unlock(&local->mtx);
2814 }
2815
2816 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2817 {
2818         struct ieee80211_local *local =
2819                 container_of(work, struct ieee80211_local, radar_detected_work);
2820         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2821         struct ieee80211_chanctx *ctx;
2822         int num_chanctx = 0;
2823
2824         mutex_lock(&local->chanctx_mtx);
2825         list_for_each_entry(ctx, &local->chanctx_list, list) {
2826                 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
2827                         continue;
2828
2829                 num_chanctx++;
2830                 chandef = ctx->conf.def;
2831         }
2832         mutex_unlock(&local->chanctx_mtx);
2833
2834         ieee80211_dfs_cac_cancel(local);
2835
2836         if (num_chanctx > 1)
2837                 /* XXX: multi-channel is not supported yet */
2838                 WARN_ON(1);
2839         else
2840                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2841 }
2842
2843 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2844 {
2845         struct ieee80211_local *local = hw_to_local(hw);
2846
2847         trace_api_radar_detected(local);
2848
2849         ieee80211_queue_work(hw, &local->radar_detected_work);
2850 }
2851 EXPORT_SYMBOL(ieee80211_radar_detected);
2852
2853 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2854 {
2855         u32 ret;
2856         int tmp;
2857
2858         switch (c->width) {
2859         case NL80211_CHAN_WIDTH_20:
2860                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2861                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2862                 break;
2863         case NL80211_CHAN_WIDTH_40:
2864                 c->width = NL80211_CHAN_WIDTH_20;
2865                 c->center_freq1 = c->chan->center_freq;
2866                 ret = IEEE80211_STA_DISABLE_40MHZ |
2867                       IEEE80211_STA_DISABLE_VHT;
2868                 break;
2869         case NL80211_CHAN_WIDTH_80:
2870                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2871                 /* n_P40 */
2872                 tmp /= 2;
2873                 /* freq_P40 */
2874                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2875                 c->width = NL80211_CHAN_WIDTH_40;
2876                 ret = IEEE80211_STA_DISABLE_VHT;
2877                 break;
2878         case NL80211_CHAN_WIDTH_80P80:
2879                 c->center_freq2 = 0;
2880                 c->width = NL80211_CHAN_WIDTH_80;
2881                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2882                       IEEE80211_STA_DISABLE_160MHZ;
2883                 break;
2884         case NL80211_CHAN_WIDTH_160:
2885                 /* n_P20 */
2886                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2887                 /* n_P80 */
2888                 tmp /= 4;
2889                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2890                 c->width = NL80211_CHAN_WIDTH_80;
2891                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2892                       IEEE80211_STA_DISABLE_160MHZ;
2893                 break;
2894         default:
2895         case NL80211_CHAN_WIDTH_20_NOHT:
2896                 WARN_ON_ONCE(1);
2897                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2898                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2899                 break;
2900         case NL80211_CHAN_WIDTH_5:
2901         case NL80211_CHAN_WIDTH_10:
2902                 WARN_ON_ONCE(1);
2903                 /* keep c->width */
2904                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2905                 break;
2906         }
2907
2908         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2909
2910         return ret;
2911 }
2912
2913 /*
2914  * Returns true if smps_mode_new is strictly more restrictive than
2915  * smps_mode_old.
2916  */
2917 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2918                                    enum ieee80211_smps_mode smps_mode_new)
2919 {
2920         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2921                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2922                 return false;
2923
2924         switch (smps_mode_old) {
2925         case IEEE80211_SMPS_STATIC:
2926                 return false;
2927         case IEEE80211_SMPS_DYNAMIC:
2928                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2929         case IEEE80211_SMPS_OFF:
2930                 return smps_mode_new != IEEE80211_SMPS_OFF;
2931         default:
2932                 WARN_ON(1);
2933         }
2934
2935         return false;
2936 }
2937
2938 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2939                               struct cfg80211_csa_settings *csa_settings)
2940 {
2941         struct sk_buff *skb;
2942         struct ieee80211_mgmt *mgmt;
2943         struct ieee80211_local *local = sdata->local;
2944         int freq;
2945         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2946                                sizeof(mgmt->u.action.u.chan_switch);
2947         u8 *pos;
2948
2949         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2950             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2951                 return -EOPNOTSUPP;
2952
2953         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2954                             5 + /* channel switch announcement element */
2955                             3 + /* secondary channel offset element */
2956                             8); /* mesh channel switch parameters element */
2957         if (!skb)
2958                 return -ENOMEM;
2959
2960         skb_reserve(skb, local->tx_headroom);
2961         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2962         memset(mgmt, 0, hdr_len);
2963         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2964                                           IEEE80211_STYPE_ACTION);
2965
2966         eth_broadcast_addr(mgmt->da);
2967         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2968         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2969                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2970         } else {
2971                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2972                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2973         }
2974         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2975         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2976         pos = skb_put(skb, 5);
2977         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
2978         *pos++ = 3;                                             /* IE length */
2979         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
2980         freq = csa_settings->chandef.chan->center_freq;
2981         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
2982         *pos++ = csa_settings->count;                           /* count */
2983
2984         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2985                 enum nl80211_channel_type ch_type;
2986
2987                 skb_put(skb, 3);
2988                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
2989                 *pos++ = 1;                                     /* IE length */
2990                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2991                 if (ch_type == NL80211_CHAN_HT40PLUS)
2992                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2993                 else
2994                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2995         }
2996
2997         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2998                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2999
3000                 skb_put(skb, 8);
3001                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
3002                 *pos++ = 6;                                     /* IE length */
3003                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
3004                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
3005                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
3006                 *pos++ |= csa_settings->block_tx ?
3007                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
3008                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
3009                 pos += 2;
3010                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
3011                 pos += 2;
3012         }
3013
3014         ieee80211_tx_skb(sdata, skb);
3015         return 0;
3016 }
3017
3018 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
3019 {
3020         return !(cs == NULL || cs->cipher == 0 ||
3021                  cs->hdr_len < cs->pn_len + cs->pn_off ||
3022                  cs->hdr_len <= cs->key_idx_off ||
3023                  cs->key_idx_shift > 7 ||
3024                  cs->key_idx_mask == 0);
3025 }
3026
3027 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
3028 {
3029         int i;
3030
3031         /* Ensure we have enough iftype bitmap space for all iftype values */
3032         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
3033
3034         for (i = 0; i < n; i++)
3035                 if (!ieee80211_cs_valid(&cs[i]))
3036                         return false;
3037
3038         return true;
3039 }
3040
3041 const struct ieee80211_cipher_scheme *
3042 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
3043                  enum nl80211_iftype iftype)
3044 {
3045         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
3046         int n = local->hw.n_cipher_schemes;
3047         int i;
3048         const struct ieee80211_cipher_scheme *cs = NULL;
3049
3050         for (i = 0; i < n; i++) {
3051                 if (l[i].cipher == cipher) {
3052                         cs = &l[i];
3053                         break;
3054                 }
3055         }
3056
3057         if (!cs || !(cs->iftype & BIT(iftype)))
3058                 return NULL;
3059
3060         return cs;
3061 }
3062
3063 int ieee80211_cs_headroom(struct ieee80211_local *local,
3064                           struct cfg80211_crypto_settings *crypto,
3065                           enum nl80211_iftype iftype)
3066 {
3067         const struct ieee80211_cipher_scheme *cs;
3068         int headroom = IEEE80211_ENCRYPT_HEADROOM;
3069         int i;
3070
3071         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
3072                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
3073                                       iftype);
3074
3075                 if (cs && headroom < cs->hdr_len)
3076                         headroom = cs->hdr_len;
3077         }
3078
3079         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
3080         if (cs && headroom < cs->hdr_len)
3081                 headroom = cs->hdr_len;
3082
3083         return headroom;
3084 }
3085
3086 static bool
3087 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
3088 {
3089         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
3090         int skip;
3091
3092         if (end > 0)
3093                 return false;
3094
3095         /* One shot NOA  */
3096         if (data->count[i] == 1)
3097                 return false;
3098
3099         if (data->desc[i].interval == 0)
3100                 return false;
3101
3102         /* End time is in the past, check for repetitions */
3103         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
3104         if (data->count[i] < 255) {
3105                 if (data->count[i] <= skip) {
3106                         data->count[i] = 0;
3107                         return false;
3108                 }
3109
3110                 data->count[i] -= skip;
3111         }
3112
3113         data->desc[i].start += skip * data->desc[i].interval;
3114
3115         return true;
3116 }
3117
3118 static bool
3119 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
3120                              s32 *offset)
3121 {
3122         bool ret = false;
3123         int i;
3124
3125         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3126                 s32 cur;
3127
3128                 if (!data->count[i])
3129                         continue;
3130
3131                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
3132                         ret = true;
3133
3134                 cur = data->desc[i].start - tsf;
3135                 if (cur > *offset)
3136                         continue;
3137
3138                 cur = data->desc[i].start + data->desc[i].duration - tsf;
3139                 if (cur > *offset)
3140                         *offset = cur;
3141         }
3142
3143         return ret;
3144 }
3145
3146 static u32
3147 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
3148 {
3149         s32 offset = 0;
3150         int tries = 0;
3151         /*
3152          * arbitrary limit, used to avoid infinite loops when combined NoA
3153          * descriptors cover the full time period.
3154          */
3155         int max_tries = 5;
3156
3157         ieee80211_extend_absent_time(data, tsf, &offset);
3158         do {
3159                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
3160                         break;
3161
3162                 tries++;
3163         } while (tries < max_tries);
3164
3165         return offset;
3166 }
3167
3168 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
3169 {
3170         u32 next_offset = BIT(31) - 1;
3171         int i;
3172
3173         data->absent = 0;
3174         data->has_next_tsf = false;
3175         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3176                 s32 start;
3177
3178                 if (!data->count[i])
3179                         continue;
3180
3181                 ieee80211_extend_noa_desc(data, tsf, i);
3182                 start = data->desc[i].start - tsf;
3183                 if (start <= 0)
3184                         data->absent |= BIT(i);
3185
3186                 if (next_offset > start)
3187                         next_offset = start;
3188
3189                 data->has_next_tsf = true;
3190         }
3191
3192         if (data->absent)
3193                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
3194
3195         data->next_tsf = tsf + next_offset;
3196 }
3197 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
3198
3199 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
3200                             struct ieee80211_noa_data *data, u32 tsf)
3201 {
3202         int ret = 0;
3203         int i;
3204
3205         memset(data, 0, sizeof(*data));
3206
3207         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3208                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
3209
3210                 if (!desc->count || !desc->duration)
3211                         continue;
3212
3213                 data->count[i] = desc->count;
3214                 data->desc[i].start = le32_to_cpu(desc->start_time);
3215                 data->desc[i].duration = le32_to_cpu(desc->duration);
3216                 data->desc[i].interval = le32_to_cpu(desc->interval);
3217
3218                 if (data->count[i] > 1 &&
3219                     data->desc[i].interval < data->desc[i].duration)
3220                         continue;
3221
3222                 ieee80211_extend_noa_desc(data, tsf, i);
3223                 ret++;
3224         }
3225
3226         if (ret)
3227                 ieee80211_update_p2p_noa(data, tsf);
3228
3229         return ret;
3230 }
3231 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
3232
3233 void ieee80211_recalc_dtim(struct ieee80211_local *local,
3234                            struct ieee80211_sub_if_data *sdata)
3235 {
3236         u64 tsf = drv_get_tsf(local, sdata);
3237         u64 dtim_count = 0;
3238         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
3239         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
3240         struct ps_data *ps;
3241         u8 bcns_from_dtim;
3242
3243         if (tsf == -1ULL || !beacon_int || !dtim_period)
3244                 return;
3245
3246         if (sdata->vif.type == NL80211_IFTYPE_AP ||
3247             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
3248                 if (!sdata->bss)
3249                         return;
3250
3251                 ps = &sdata->bss->ps;
3252         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3253                 ps = &sdata->u.mesh.ps;
3254         } else {
3255                 return;
3256         }
3257
3258         /*
3259          * actually finds last dtim_count, mac80211 will update in
3260          * __beacon_add_tim().
3261          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
3262          */
3263         do_div(tsf, beacon_int);
3264         bcns_from_dtim = do_div(tsf, dtim_period);
3265         /* just had a DTIM */
3266         if (!bcns_from_dtim)
3267                 dtim_count = 0;
3268         else
3269                 dtim_count = dtim_period - bcns_from_dtim;
3270
3271         ps->dtim_count = dtim_count;
3272 }
3273
3274 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
3275                                          struct ieee80211_chanctx *ctx)
3276 {
3277         struct ieee80211_sub_if_data *sdata;
3278         u8 radar_detect = 0;
3279
3280         lockdep_assert_held(&local->chanctx_mtx);
3281
3282         if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
3283                 return 0;
3284
3285         list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
3286                 if (sdata->reserved_radar_required)
3287                         radar_detect |= BIT(sdata->reserved_chandef.width);
3288
3289         /*
3290          * An in-place reservation context should not have any assigned vifs
3291          * until it replaces the other context.
3292          */
3293         WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
3294                 !list_empty(&ctx->assigned_vifs));
3295
3296         list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
3297                 if (sdata->radar_required)
3298                         radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
3299
3300         return radar_detect;
3301 }
3302
3303 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
3304                                  const struct cfg80211_chan_def *chandef,
3305                                  enum ieee80211_chanctx_mode chanmode,
3306                                  u8 radar_detect)
3307 {
3308         struct ieee80211_local *local = sdata->local;
3309         struct ieee80211_sub_if_data *sdata_iter;
3310         enum nl80211_iftype iftype = sdata->wdev.iftype;
3311         int num[NUM_NL80211_IFTYPES];
3312         struct ieee80211_chanctx *ctx;
3313         int num_different_channels = 0;
3314         int total = 1;
3315
3316         lockdep_assert_held(&local->chanctx_mtx);
3317
3318         if (WARN_ON(hweight32(radar_detect) > 1))
3319                 return -EINVAL;
3320
3321         if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3322                     !chandef->chan))
3323                 return -EINVAL;
3324
3325         if (chandef)
3326                 num_different_channels = 1;
3327
3328         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
3329                 return -EINVAL;
3330
3331         /* Always allow software iftypes */
3332         if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
3333                 if (radar_detect)
3334                         return -EINVAL;
3335                 return 0;
3336         }
3337
3338         memset(num, 0, sizeof(num));
3339
3340         if (iftype != NL80211_IFTYPE_UNSPECIFIED)
3341                 num[iftype] = 1;
3342
3343         list_for_each_entry(ctx, &local->chanctx_list, list) {
3344                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3345                         continue;
3346                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3347                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
3348                         num_different_channels++;
3349                         continue;
3350                 }
3351                 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3352                     cfg80211_chandef_compatible(chandef,
3353                                                 &ctx->conf.def))
3354                         continue;
3355                 num_different_channels++;
3356         }
3357
3358         list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
3359                 struct wireless_dev *wdev_iter;
3360
3361                 wdev_iter = &sdata_iter->wdev;
3362
3363                 if (sdata_iter == sdata ||
3364                     !ieee80211_sdata_running(sdata_iter) ||
3365                     local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
3366                         continue;
3367
3368                 num[wdev_iter->iftype]++;
3369                 total++;
3370         }
3371
3372         if (total == 1 && !radar_detect)
3373                 return 0;
3374
3375         return cfg80211_check_combinations(local->hw.wiphy,
3376                                            num_different_channels,
3377                                            radar_detect, num);
3378 }
3379
3380 static void
3381 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
3382                          void *data)
3383 {
3384         u32 *max_num_different_channels = data;
3385
3386         *max_num_different_channels = max(*max_num_different_channels,
3387                                           c->num_different_channels);
3388 }
3389
3390 int ieee80211_max_num_channels(struct ieee80211_local *local)
3391 {
3392         struct ieee80211_sub_if_data *sdata;
3393         int num[NUM_NL80211_IFTYPES] = {};
3394         struct ieee80211_chanctx *ctx;
3395         int num_different_channels = 0;
3396         u8 radar_detect = 0;
3397         u32 max_num_different_channels = 1;
3398         int err;
3399
3400         lockdep_assert_held(&local->chanctx_mtx);
3401
3402         list_for_each_entry(ctx, &local->chanctx_list, list) {
3403                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3404                         continue;
3405
3406                 num_different_channels++;
3407
3408                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3409         }
3410
3411         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3412                 num[sdata->wdev.iftype]++;
3413
3414         err = cfg80211_iter_combinations(local->hw.wiphy,
3415                                          num_different_channels, radar_detect,
3416                                          num, ieee80211_iter_max_chans,
3417                                          &max_num_different_channels);
3418         if (err < 0)
3419                 return err;
3420
3421         return max_num_different_channels;
3422 }
3423
3424 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
3425 {
3426         *buf++ = WLAN_EID_VENDOR_SPECIFIC;
3427         *buf++ = 7; /* len */
3428         *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
3429         *buf++ = 0x50;
3430         *buf++ = 0xf2;
3431         *buf++ = 2; /* WME */
3432         *buf++ = 0; /* WME info */
3433         *buf++ = 1; /* WME ver */
3434         *buf++ = qosinfo; /* U-APSD no in use */
3435
3436         return buf;
3437 }
3438
3439 void ieee80211_txq_get_depth(struct ieee80211_txq *txq,
3440                              unsigned long *frame_cnt,
3441                              unsigned long *byte_cnt)
3442 {
3443         struct txq_info *txqi = to_txq_info(txq);
3444         u32 frag_cnt = 0, frag_bytes = 0;
3445         struct sk_buff *skb;
3446
3447         skb_queue_walk(&txqi->frags, skb) {
3448                 frag_cnt++;
3449                 frag_bytes += skb->len;
3450         }
3451
3452         if (frame_cnt)
3453                 *frame_cnt = txqi->tin.backlog_packets + frag_cnt;
3454
3455         if (byte_cnt)
3456                 *byte_cnt = txqi->tin.backlog_bytes + frag_bytes;
3457 }
3458 EXPORT_SYMBOL(ieee80211_txq_get_depth);