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  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * utilities for mac80211
  13  */
  14
  15 #include <net/mac80211.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/export.h>
  18 #include <linux/types.h>
  19 #include <linux/slab.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/if_arp.h>
  23 #include <linux/bitmap.h>
  24 #include <linux/crc32.h>
  25 #include <net/net_namespace.h>
  26 #include <net/cfg80211.h>
  27 #include <net/rtnetlink.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "mesh.h"
  33 #include "wme.h"
  34 #include "led.h"
  35 #include "wep.h"
  36
  37 /* privid for wiphys to determine whether they belong to us or not */
  38 const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid;
  39
  40 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  41 {
  42         struct ieee80211_local *local;
  43         BUG_ON(!wiphy);
  44
  45         local = wiphy_priv(wiphy);
  46         return &local->hw;
  47 }
  48 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  49
  50 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  51                         enum nl80211_iftype type)
  52 {
  53         __le16 fc = hdr->frame_control;
  54
  55          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  56         if (len < 16)
  57                 return NULL;
  58
  59         if (ieee80211_is_data(fc)) {
  60                 if (len < 24) /* drop incorrect hdr len (data) */
  61                         return NULL;
  62
  63                 if (ieee80211_has_a4(fc))
  64                         return NULL;
  65                 if (ieee80211_has_tods(fc))
  66                         return hdr->addr1;
  67                 if (ieee80211_has_fromds(fc))
  68                         return hdr->addr2;
  69
  70                 return hdr->addr3;
  71         }
  72
  73         if (ieee80211_is_mgmt(fc)) {
  74                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  75                         return NULL;
  76                 return hdr->addr3;
  77         }
  78
  79         if (ieee80211_is_ctl(fc)) {
  80                 if (ieee80211_is_pspoll(fc))
  81                         return hdr->addr1;
  82
  83                 if (ieee80211_is_back_req(fc)) {
  84                         switch (type) {
  85                         case NL80211_IFTYPE_STATION:
  86                                 return hdr->addr2;
  87                         case NL80211_IFTYPE_AP:
  88                         case NL80211_IFTYPE_AP_VLAN:
  89                                 return hdr->addr1;
  90                         default:
  91                                 break; /* fall through to the return */
  92                         }
  93                 }
  94         }
  95
  96         return NULL;
  97 }
  98
  99 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
 100 {
 101         struct sk_buff *skb;
 102         struct ieee80211_hdr *hdr;
 103
 104         skb_queue_walk(&tx->skbs, skb) {
 105                 hdr = (struct ieee80211_hdr *) skb->data;
 106                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 107         }
 108 }
 109
 110 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
 111                              int rate, int erp, int short_preamble,
 112                              int shift)
 113 {
 114         int dur;
 115
 116         /* calculate duration (in microseconds, rounded up to next higher
 117          * integer if it includes a fractional microsecond) to send frame of
 118          * len bytes (does not include FCS) at the given rate. Duration will
 119          * also include SIFS.
 120          *
 121          * rate is in 100 kbps, so divident is multiplied by 10 in the
 122          * DIV_ROUND_UP() operations.
 123          *
 124          * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
 125          * is assumed to be 0 otherwise.
 126          */
 127
 128         if (band == IEEE80211_BAND_5GHZ || erp) {
 129                 /*
 130                  * OFDM:
 131                  *
 132                  * N_DBPS = DATARATE x 4
 133                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 134                  *      (16 = SIGNAL time, 6 = tail bits)
 135                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 136                  *
 137                  * T_SYM = 4 usec
 138                  * 802.11a - 18.5.2: aSIFSTime = 16 usec
 139                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 140                  *      signal ext = 6 usec
 141                  */
 142                 dur = 16; /* SIFS + signal ext */
 143                 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
 144                 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
 145
 146                 /* IEEE 802.11-2012 18.3.2.4: all values above are:
 147                  *  * times 4 for 5 MHz
 148                  *  * times 2 for 10 MHz
 149                  */
 150                 dur *= 1 << shift;
 151
 152                 /* rates should already consider the channel bandwidth,
 153                  * don't apply divisor again.
 154                  */
 155                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 156                                         4 * rate); /* T_SYM x N_SYM */
 157         } else {
 158                 /*
 159                  * 802.11b or 802.11g with 802.11b compatibility:
 160                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 161                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 162                  *
 163                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 164                  * aSIFSTime = 10 usec
 165                  * aPreambleLength = 144 usec or 72 usec with short preamble
 166                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 167                  */
 168                 dur = 10; /* aSIFSTime = 10 usec */
 169                 dur += short_preamble ? (72 + 24) : (144 + 48);
 170
 171                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 172         }
 173
 174         return dur;
 175 }
 176
 177 /* Exported duration function for driver use */
 178 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 179                                         struct ieee80211_vif *vif,
 180                                         enum ieee80211_band band,
 181                                         size_t frame_len,
 182                                         struct ieee80211_rate *rate)
 183 {
 184         struct ieee80211_sub_if_data *sdata;
 185         u16 dur;
 186         int erp, shift = 0;
 187         bool short_preamble = false;
 188
 189         erp = 0;
 190         if (vif) {
 191                 sdata = vif_to_sdata(vif);
 192                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 193                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 194                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 195                 shift = ieee80211_vif_get_shift(vif);
 196         }
 197
 198         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 199                                        short_preamble, shift);
 200
 201         return cpu_to_le16(dur);
 202 }
 203 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 204
 205 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 206                               struct ieee80211_vif *vif, size_t frame_len,
 207                               const struct ieee80211_tx_info *frame_txctl)
 208 {
 209         struct ieee80211_local *local = hw_to_local(hw);
 210         struct ieee80211_rate *rate;
 211         struct ieee80211_sub_if_data *sdata;
 212         bool short_preamble;
 213         int erp, shift = 0, bitrate;
 214         u16 dur;
 215         struct ieee80211_supported_band *sband;
 216
 217         sband = local->hw.wiphy->bands[frame_txctl->band];
 218
 219         short_preamble = false;
 220
 221         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 222
 223         erp = 0;
 224         if (vif) {
 225                 sdata = vif_to_sdata(vif);
 226                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 227                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 228                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 229                 shift = ieee80211_vif_get_shift(vif);
 230         }
 231
 232         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 233
 234         /* CTS duration */
 235         dur = ieee80211_frame_duration(sband->band, 10, bitrate,
 236                                        erp, short_preamble, shift);
 237         /* Data frame duration */
 238         dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
 239                                         erp, short_preamble, shift);
 240         /* ACK duration */
 241         dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 242                                         erp, short_preamble, shift);
 243
 244         return cpu_to_le16(dur);
 245 }
 246 EXPORT_SYMBOL(ieee80211_rts_duration);
 247
 248 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 249                                     struct ieee80211_vif *vif,
 250                                     size_t frame_len,
 251                                     const struct ieee80211_tx_info *frame_txctl)
 252 {
 253         struct ieee80211_local *local = hw_to_local(hw);
 254         struct ieee80211_rate *rate;
 255         struct ieee80211_sub_if_data *sdata;
 256         bool short_preamble;
 257         int erp, shift = 0, bitrate;
 258         u16 dur;
 259         struct ieee80211_supported_band *sband;
 260
 261         sband = local->hw.wiphy->bands[frame_txctl->band];
 262
 263         short_preamble = false;
 264
 265         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 266         erp = 0;
 267         if (vif) {
 268                 sdata = vif_to_sdata(vif);
 269                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 270                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 271                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 272                 shift = ieee80211_vif_get_shift(vif);
 273         }
 274
 275         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 276
 277         /* Data frame duration */
 278         dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
 279                                        erp, short_preamble, shift);
 280         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 281                 /* ACK duration */
 282                 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 283                                                 erp, short_preamble, shift);
 284         }
 285
 286         return cpu_to_le16(dur);
 287 }
 288 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 289
 290 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 291 {
 292         struct ieee80211_sub_if_data *sdata;
 293         int n_acs = IEEE80211_NUM_ACS;
 294
 295         if (local->hw.queues < IEEE80211_NUM_ACS)
 296                 n_acs = 1;
 297
 298         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 299                 int ac;
 300
 301                 if (!sdata->dev)
 302                         continue;
 303
 304                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 305                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 306                         continue;
 307
 308                 for (ac = 0; ac < n_acs; ac++) {
 309                         int ac_queue = sdata->vif.hw_queue[ac];
 310
 311                         if (ac_queue == queue ||
 312                             (sdata->vif.cab_queue == queue &&
 313                              local->queue_stop_reasons[ac_queue] == 0 &&
 314                              skb_queue_empty(&local->pending[ac_queue])))
 315                                 netif_wake_subqueue(sdata->dev, ac);
 316                 }
 317         }
 318 }
 319
 320 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 321                                    enum queue_stop_reason reason,
 322                                    bool refcounted)
 323 {
 324         struct ieee80211_local *local = hw_to_local(hw);
 325
 326         trace_wake_queue(local, queue, reason);
 327
 328         if (WARN_ON(queue >= hw->queues))
 329                 return;
 330
 331         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 332                 return;
 333
 334         if (!refcounted)
 335                 local->q_stop_reasons[queue][reason] = 0;
 336         else
 337                 local->q_stop_reasons[queue][reason]--;
 338
 339         if (local->q_stop_reasons[queue][reason] == 0)
 340                 __clear_bit(reason, &local->queue_stop_reasons[queue]);
 341
 342         if (local->queue_stop_reasons[queue] != 0)
 343                 /* someone still has this queue stopped */
 344                 return;
 345
 346         if (skb_queue_empty(&local->pending[queue])) {
 347                 rcu_read_lock();
 348                 ieee80211_propagate_queue_wake(local, queue);
 349                 rcu_read_unlock();
 350         } else
 351                 tasklet_schedule(&local->tx_pending_tasklet);
 352 }
 353
 354 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 355                                     enum queue_stop_reason reason,
 356                                     bool refcounted)
 357 {
 358         struct ieee80211_local *local = hw_to_local(hw);
 359         unsigned long flags;
 360
 361         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 362         __ieee80211_wake_queue(hw, queue, reason, refcounted);
 363         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 364 }
 365
 366 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 367 {
 368         ieee80211_wake_queue_by_reason(hw, queue,
 369                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 370                                        false);
 371 }
 372 EXPORT_SYMBOL(ieee80211_wake_queue);
 373
 374 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 375                                    enum queue_stop_reason reason,
 376                                    bool refcounted)
 377 {
 378         struct ieee80211_local *local = hw_to_local(hw);
 379         struct ieee80211_sub_if_data *sdata;
 380         int n_acs = IEEE80211_NUM_ACS;
 381
 382         trace_stop_queue(local, queue, reason);
 383
 384         if (WARN_ON(queue >= hw->queues))
 385                 return;
 386
 387         if (!refcounted)
 388                 local->q_stop_reasons[queue][reason] = 1;
 389         else
 390                 local->q_stop_reasons[queue][reason]++;
 391
 392         if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
 393                 return;
 394
 395         if (local->hw.queues < IEEE80211_NUM_ACS)
 396                 n_acs = 1;
 397
 398         rcu_read_lock();
 399         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 400                 int ac;
 401
 402                 if (!sdata->dev)
 403                         continue;
 404
 405                 for (ac = 0; ac < n_acs; ac++) {
 406                         if (sdata->vif.hw_queue[ac] == queue ||
 407                             sdata->vif.cab_queue == queue)
 408                                 netif_stop_subqueue(sdata->dev, ac);
 409                 }
 410         }
 411         rcu_read_unlock();
 412 }
 413
 414 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 415                                     enum queue_stop_reason reason,
 416                                     bool refcounted)
 417 {
 418         struct ieee80211_local *local = hw_to_local(hw);
 419         unsigned long flags;
 420
 421         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 422         __ieee80211_stop_queue(hw, queue, reason, refcounted);
 423         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 424 }
 425
 426 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 427 {
 428         ieee80211_stop_queue_by_reason(hw, queue,
 429                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
 430                                        false);
 431 }
 432 EXPORT_SYMBOL(ieee80211_stop_queue);
 433
 434 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 435                                struct sk_buff *skb)
 436 {
 437         struct ieee80211_hw *hw = &local->hw;
 438         unsigned long flags;
 439         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 440         int queue = info->hw_queue;
 441
 442         if (WARN_ON(!info->control.vif)) {
 443                 ieee80211_free_txskb(&local->hw, skb);
 444                 return;
 445         }
 446
 447         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 448         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 449                                false);
 450         __skb_queue_tail(&local->pending[queue], skb);
 451         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 452                                false);
 453         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 454 }
 455
 456 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 457                                 struct sk_buff_head *skbs)
 458 {
 459         struct ieee80211_hw *hw = &local->hw;
 460         struct sk_buff *skb;
 461         unsigned long flags;
 462         int queue, i;
 463
 464         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 465         while ((skb = skb_dequeue(skbs))) {
 466                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 467
 468                 if (WARN_ON(!info->control.vif)) {
 469                         ieee80211_free_txskb(&local->hw, skb);
 470                         continue;
 471                 }
 472
 473                 queue = info->hw_queue;
 474
 475                 __ieee80211_stop_queue(hw, queue,
 476                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 477                                 false);
 478
 479                 __skb_queue_tail(&local->pending[queue], skb);
 480         }
 481
 482         for (i = 0; i < hw->queues; i++)
 483                 __ieee80211_wake_queue(hw, i,
 484                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
 485                         false);
 486         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 487 }
 488
 489 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 490                                      unsigned long queues,
 491                                      enum queue_stop_reason reason,
 492                                      bool refcounted)
 493 {
 494         struct ieee80211_local *local = hw_to_local(hw);
 495         unsigned long flags;
 496         int i;
 497
 498         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 499
 500         for_each_set_bit(i, &queues, hw->queues)
 501                 __ieee80211_stop_queue(hw, i, reason, refcounted);
 502
 503         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 504 }
 505
 506 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 507 {
 508         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 509                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 510                                         false);
 511 }
 512 EXPORT_SYMBOL(ieee80211_stop_queues);
 513
 514 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 515 {
 516         struct ieee80211_local *local = hw_to_local(hw);
 517         unsigned long flags;
 518         int ret;
 519
 520         if (WARN_ON(queue >= hw->queues))
 521                 return true;
 522
 523         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 524         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 525                        &local->queue_stop_reasons[queue]);
 526         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 527         return ret;
 528 }
 529 EXPORT_SYMBOL(ieee80211_queue_stopped);
 530
 531 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 532                                      unsigned long queues,
 533                                      enum queue_stop_reason reason,
 534                                      bool refcounted)
 535 {
 536         struct ieee80211_local *local = hw_to_local(hw);
 537         unsigned long flags;
 538         int i;
 539
 540         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 541
 542         for_each_set_bit(i, &queues, hw->queues)
 543                 __ieee80211_wake_queue(hw, i, reason, refcounted);
 544
 545         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 546 }
 547
 548 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 549 {
 550         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 551                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
 552                                         false);
 553 }
 554 EXPORT_SYMBOL(ieee80211_wake_queues);
 555
 556 static unsigned int
 557 ieee80211_get_vif_queues(struct ieee80211_local *local,
 558                          struct ieee80211_sub_if_data *sdata)
 559 {
 560         unsigned int queues;
 561
 562         if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
 563                 int ac;
 564
 565                 queues = 0;
 566
 567                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 568                         queues |= BIT(sdata->vif.hw_queue[ac]);
 569                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 570                         queues |= BIT(sdata->vif.cab_queue);
 571         } else {
 572                 /* all queues */
 573                 queues = BIT(local->hw.queues) - 1;
 574         }
 575
 576         return queues;
 577 }
 578
 579 void ieee80211_flush_queues(struct ieee80211_local *local,
 580                             struct ieee80211_sub_if_data *sdata)
 581 {
 582         unsigned int queues;
 583
 584         if (!local->ops->flush)
 585                 return;
 586
 587         queues = ieee80211_get_vif_queues(local, sdata);
 588
 589         ieee80211_stop_queues_by_reason(&local->hw, queues,
 590                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 591                                         false);
 592
 593         drv_flush(local, sdata, queues, false);
 594
 595         ieee80211_wake_queues_by_reason(&local->hw, queues,
 596                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
 597                                         false);
 598 }
 599
 600 void ieee80211_stop_vif_queues(struct ieee80211_local *local,
 601                                struct ieee80211_sub_if_data *sdata,
 602                                enum queue_stop_reason reason)
 603 {
 604         ieee80211_stop_queues_by_reason(&local->hw,
 605                                         ieee80211_get_vif_queues(local, sdata),
 606                                         reason, true);
 607 }
 608
 609 void ieee80211_wake_vif_queues(struct ieee80211_local *local,
 610                                struct ieee80211_sub_if_data *sdata,
 611                                enum queue_stop_reason reason)
 612 {
 613         ieee80211_wake_queues_by_reason(&local->hw,
 614                                         ieee80211_get_vif_queues(local, sdata),
 615                                         reason, true);
 616 }
 617
 618 static void __iterate_active_interfaces(struct ieee80211_local *local,
 619                                         u32 iter_flags,
 620                                         void (*iterator)(void *data, u8 *mac,
 621                                                 struct ieee80211_vif *vif),
 622                                         void *data)
 623 {
 624         struct ieee80211_sub_if_data *sdata;
 625
 626         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 627                 switch (sdata->vif.type) {
 628                 case NL80211_IFTYPE_MONITOR:
 629                         if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 630                                 continue;
 631                         break;
 632                 case NL80211_IFTYPE_AP_VLAN:
 633                         continue;
 634                 default:
 635                         break;
 636                 }
 637                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 638                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 639                         continue;
 640                 if (ieee80211_sdata_running(sdata))
 641                         iterator(data, sdata->vif.addr,
 642                                  &sdata->vif);
 643         }
 644
 645         sdata = rcu_dereference_check(local->monitor_sdata,
 646                                       lockdep_is_held(&local->iflist_mtx) ||
 647                                       lockdep_rtnl_is_held());
 648         if (sdata &&
 649             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 650              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 651                 iterator(data, sdata->vif.addr, &sdata->vif);
 652 }
 653
 654 void ieee80211_iterate_active_interfaces(
 655         struct ieee80211_hw *hw, u32 iter_flags,
 656         void (*iterator)(void *data, u8 *mac,
 657                          struct ieee80211_vif *vif),
 658         void *data)
 659 {
 660         struct ieee80211_local *local = hw_to_local(hw);
 661
 662         mutex_lock(&local->iflist_mtx);
 663         __iterate_active_interfaces(local, iter_flags, iterator, data);
 664         mutex_unlock(&local->iflist_mtx);
 665 }
 666 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 667
 668 void ieee80211_iterate_active_interfaces_atomic(
 669         struct ieee80211_hw *hw, u32 iter_flags,
 670         void (*iterator)(void *data, u8 *mac,
 671                          struct ieee80211_vif *vif),
 672         void *data)
 673 {
 674         struct ieee80211_local *local = hw_to_local(hw);
 675
 676         rcu_read_lock();
 677         __iterate_active_interfaces(local, iter_flags, iterator, data);
 678         rcu_read_unlock();
 679 }
 680 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 681
 682 void ieee80211_iterate_active_interfaces_rtnl(
 683         struct ieee80211_hw *hw, u32 iter_flags,
 684         void (*iterator)(void *data, u8 *mac,
 685                          struct ieee80211_vif *vif),
 686         void *data)
 687 {
 688         struct ieee80211_local *local = hw_to_local(hw);
 689
 690         ASSERT_RTNL();
 691
 692         __iterate_active_interfaces(local, iter_flags, iterator, data);
 693 }
 694 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
 695
 696 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
 697 {
 698         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 699
 700         if (!ieee80211_sdata_running(sdata) ||
 701             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 702                 return NULL;
 703         return &sdata->vif;
 704 }
 705 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
 706
 707 /*
 708  * Nothing should have been stuffed into the workqueue during
 709  * the suspend->resume cycle. If this WARN is seen then there
 710  * is a bug with either the driver suspend or something in
 711  * mac80211 stuffing into the workqueue which we haven't yet
 712  * cleared during mac80211's suspend cycle.
 713  */
 714 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 715 {
 716         if (WARN(local->suspended && !local->resuming,
 717                  "queueing ieee80211 work while going to suspend\n"))
 718                 return false;
 719
 720         return true;
 721 }
 722
 723 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 724 {
 725         struct ieee80211_local *local = hw_to_local(hw);
 726
 727         if (!ieee80211_can_queue_work(local))
 728                 return;
 729
 730         queue_work(local->workqueue, work);
 731 }
 732 EXPORT_SYMBOL(ieee80211_queue_work);
 733
 734 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 735                                   struct delayed_work *dwork,
 736                                   unsigned long delay)
 737 {
 738         struct ieee80211_local *local = hw_to_local(hw);
 739
 740         if (!ieee80211_can_queue_work(local))
 741                 return;
 742
 743         queue_delayed_work(local->workqueue, dwork, delay);
 744 }
 745 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 746
 747 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 748                                struct ieee802_11_elems *elems,
 749                                u64 filter, u32 crc)
 750 {
 751         size_t left = len;
 752         const u8 *pos = start;
 753         bool calc_crc = filter != 0;
 754         DECLARE_BITMAP(seen_elems, 256);
 755         const u8 *ie;
 756
 757         bitmap_zero(seen_elems, 256);
 758         memset(elems, 0, sizeof(*elems));
 759         elems->ie_start = start;
 760         elems->total_len = len;
 761
 762         while (left >= 2) {
 763                 u8 id, elen;
 764                 bool elem_parse_failed;
 765
 766                 id = *pos++;
 767                 elen = *pos++;
 768                 left -= 2;
 769
 770                 if (elen > left) {
 771                         elems->parse_error = true;
 772                         break;
 773                 }
 774
 775                 switch (id) {
 776                 case WLAN_EID_SSID:
 777                 case WLAN_EID_SUPP_RATES:
 778                 case WLAN_EID_FH_PARAMS:
 779                 case WLAN_EID_DS_PARAMS:
 780                 case WLAN_EID_CF_PARAMS:
 781                 case WLAN_EID_TIM:
 782                 case WLAN_EID_IBSS_PARAMS:
 783                 case WLAN_EID_CHALLENGE:
 784                 case WLAN_EID_RSN:
 785                 case WLAN_EID_ERP_INFO:
 786                 case WLAN_EID_EXT_SUPP_RATES:
 787                 case WLAN_EID_HT_CAPABILITY:
 788                 case WLAN_EID_HT_OPERATION:
 789                 case WLAN_EID_VHT_CAPABILITY:
 790                 case WLAN_EID_VHT_OPERATION:
 791                 case WLAN_EID_MESH_ID:
 792                 case WLAN_EID_MESH_CONFIG:
 793                 case WLAN_EID_PEER_MGMT:
 794                 case WLAN_EID_PREQ:
 795                 case WLAN_EID_PREP:
 796                 case WLAN_EID_PERR:
 797                 case WLAN_EID_RANN:
 798                 case WLAN_EID_CHANNEL_SWITCH:
 799                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 800                 case WLAN_EID_COUNTRY:
 801                 case WLAN_EID_PWR_CONSTRAINT:
 802                 case WLAN_EID_TIMEOUT_INTERVAL:
 803                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 804                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 805                 case WLAN_EID_CHAN_SWITCH_PARAM:
 806                 /*
 807                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 808                  * that if the content gets bigger it might be needed more than once
 809                  */
 810                         if (test_bit(id, seen_elems)) {
 811                                 elems->parse_error = true;
 812                                 left -= elen;
 813                                 pos += elen;
 814                                 continue;
 815                         }
 816                         break;
 817                 }
 818
 819                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 820                         crc = crc32_be(crc, pos - 2, elen + 2);
 821
 822                 elem_parse_failed = false;
 823
 824                 switch (id) {
 825                 case WLAN_EID_SSID:
 826                         elems->ssid = pos;
 827                         elems->ssid_len = elen;
 828                         break;
 829                 case WLAN_EID_SUPP_RATES:
 830                         elems->supp_rates = pos;
 831                         elems->supp_rates_len = elen;
 832                         break;
 833                 case WLAN_EID_DS_PARAMS:
 834                         if (elen >= 1)
 835                                 elems->ds_params = pos;
 836                         else
 837                                 elem_parse_failed = true;
 838                         break;
 839                 case WLAN_EID_TIM:
 840                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 841                                 elems->tim = (void *)pos;
 842                                 elems->tim_len = elen;
 843                         } else
 844                                 elem_parse_failed = true;
 845                         break;
 846                 case WLAN_EID_CHALLENGE:
 847                         elems->challenge = pos;
 848                         elems->challenge_len = elen;
 849                         break;
 850                 case WLAN_EID_VENDOR_SPECIFIC:
 851                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 852                             pos[2] == 0xf2) {
 853                                 /* Microsoft OUI (00:50:F2) */
 854
 855                                 if (calc_crc)
 856                                         crc = crc32_be(crc, pos - 2, elen + 2);
 857
 858                                 if (elen >= 5 && pos[3] == 2) {
 859                                         /* OUI Type 2 - WMM IE */
 860                                         if (pos[4] == 0) {
 861                                                 elems->wmm_info = pos;
 862                                                 elems->wmm_info_len = elen;
 863                                         } else if (pos[4] == 1) {
 864                                                 elems->wmm_param = pos;
 865                                                 elems->wmm_param_len = elen;
 866                                         }
 867                                 }
 868                         }
 869                         break;
 870                 case WLAN_EID_RSN:
 871                         elems->rsn = pos;
 872                         elems->rsn_len = elen;
 873                         break;
 874                 case WLAN_EID_ERP_INFO:
 875                         if (elen >= 1)
 876                                 elems->erp_info = pos;
 877                         else
 878                                 elem_parse_failed = true;
 879                         break;
 880                 case WLAN_EID_EXT_SUPP_RATES:
 881                         elems->ext_supp_rates = pos;
 882                         elems->ext_supp_rates_len = elen;
 883                         break;
 884                 case WLAN_EID_HT_CAPABILITY:
 885                         if (elen >= sizeof(struct ieee80211_ht_cap))
 886                                 elems->ht_cap_elem = (void *)pos;
 887                         else
 888                                 elem_parse_failed = true;
 889                         break;
 890                 case WLAN_EID_HT_OPERATION:
 891                         if (elen >= sizeof(struct ieee80211_ht_operation))
 892                                 elems->ht_operation = (void *)pos;
 893                         else
 894                                 elem_parse_failed = true;
 895                         break;
 896                 case WLAN_EID_VHT_CAPABILITY:
 897                         if (elen >= sizeof(struct ieee80211_vht_cap))
 898                                 elems->vht_cap_elem = (void *)pos;
 899                         else
 900                                 elem_parse_failed = true;
 901                         break;
 902                 case WLAN_EID_VHT_OPERATION:
 903                         if (elen >= sizeof(struct ieee80211_vht_operation))
 904                                 elems->vht_operation = (void *)pos;
 905                         else
 906                                 elem_parse_failed = true;
 907                         break;
 908                 case WLAN_EID_OPMODE_NOTIF:
 909                         if (elen > 0)
 910                                 elems->opmode_notif = pos;
 911                         else
 912                                 elem_parse_failed = true;
 913                         break;
 914                 case WLAN_EID_MESH_ID:
 915                         elems->mesh_id = pos;
 916                         elems->mesh_id_len = elen;
 917                         break;
 918                 case WLAN_EID_MESH_CONFIG:
 919                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 920                                 elems->mesh_config = (void *)pos;
 921                         else
 922                                 elem_parse_failed = true;
 923                         break;
 924                 case WLAN_EID_PEER_MGMT:
 925                         elems->peering = pos;
 926                         elems->peering_len = elen;
 927                         break;
 928                 case WLAN_EID_MESH_AWAKE_WINDOW:
 929                         if (elen >= 2)
 930                                 elems->awake_window = (void *)pos;
 931                         break;
 932                 case WLAN_EID_PREQ:
 933                         elems->preq = pos;
 934                         elems->preq_len = elen;
 935                         break;
 936                 case WLAN_EID_PREP:
 937                         elems->prep = pos;
 938                         elems->prep_len = elen;
 939                         break;
 940                 case WLAN_EID_PERR:
 941                         elems->perr = pos;
 942                         elems->perr_len = elen;
 943                         break;
 944                 case WLAN_EID_RANN:
 945                         if (elen >= sizeof(struct ieee80211_rann_ie))
 946                                 elems->rann = (void *)pos;
 947                         else
 948                                 elem_parse_failed = true;
 949                         break;
 950                 case WLAN_EID_CHANNEL_SWITCH:
 951                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 952                                 elem_parse_failed = true;
 953                                 break;
 954                         }
 955                         elems->ch_switch_ie = (void *)pos;
 956                         break;
 957                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 958                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
 959                                 elem_parse_failed = true;
 960                                 break;
 961                         }
 962                         elems->ext_chansw_ie = (void *)pos;
 963                         break;
 964                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 965                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
 966                                 elem_parse_failed = true;
 967                                 break;
 968                         }
 969                         elems->sec_chan_offs = (void *)pos;
 970                         break;
 971                 case WLAN_EID_CHAN_SWITCH_PARAM:
 972                         if (elen !=
 973                             sizeof(*elems->mesh_chansw_params_ie)) {
 974                                 elem_parse_failed = true;
 975                                 break;
 976                         }
 977                         elems->mesh_chansw_params_ie = (void *)pos;
 978                         break;
 979                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 980                         if (!action ||
 981                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
 982                                 elem_parse_failed = true;
 983                                 break;
 984                         }
 985                         elems->wide_bw_chansw_ie = (void *)pos;
 986                         break;
 987                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
 988                         if (action) {
 989                                 elem_parse_failed = true;
 990                                 break;
 991                         }
 992                         /*
 993                          * This is a bit tricky, but as we only care about
 994                          * the wide bandwidth channel switch element, so
 995                          * just parse it out manually.
 996                          */
 997                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
 998                                               pos, elen);
 999                         if (ie) {
1000                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
1001                                         elems->wide_bw_chansw_ie =
1002                                                 (void *)(ie + 2);
1003                                 else
1004                                         elem_parse_failed = true;
1005                         }
1006                         break;
1007                 case WLAN_EID_COUNTRY:
1008                         elems->country_elem = pos;
1009                         elems->country_elem_len = elen;
1010                         break;
1011                 case WLAN_EID_PWR_CONSTRAINT:
1012                         if (elen != 1) {
1013                                 elem_parse_failed = true;
1014                                 break;
1015                         }
1016                         elems->pwr_constr_elem = pos;
1017                         break;
1018                 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
1019                         /* Lots of different options exist, but we only care
1020                          * about the Dynamic Transmit Power Control element.
1021                          * First check for the Cisco OUI, then for the DTPC
1022                          * tag (0x00).
1023                          */
1024                         if (elen < 4) {
1025                                 elem_parse_failed = true;
1026                                 break;
1027                         }
1028
1029                         if (pos[0] != 0x00 || pos[1] != 0x40 ||
1030                             pos[2] != 0x96 || pos[3] != 0x00)
1031                                 break;
1032
1033                         if (elen != 6) {
1034                                 elem_parse_failed = true;
1035                                 break;
1036                         }
1037
1038                         if (calc_crc)
1039                                 crc = crc32_be(crc, pos - 2, elen + 2);
1040
1041                         elems->cisco_dtpc_elem = pos;
1042                         break;
1043                 case WLAN_EID_TIMEOUT_INTERVAL:
1044                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
1045                                 elems->timeout_int = (void *)pos;
1046                         else
1047                                 elem_parse_failed = true;
1048                         break;
1049                 default:
1050                         break;
1051                 }
1052
1053                 if (elem_parse_failed)
1054                         elems->parse_error = true;
1055                 else
1056                         __set_bit(id, seen_elems);
1057
1058                 left -= elen;
1059                 pos += elen;
1060         }
1061
1062         if (left != 0)
1063                 elems->parse_error = true;
1064
1065         return crc;
1066 }
1067
1068 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
1069                                bool bss_notify)
1070 {
1071         struct ieee80211_local *local = sdata->local;
1072         struct ieee80211_tx_queue_params qparam;
1073         struct ieee80211_chanctx_conf *chanctx_conf;
1074         int ac;
1075         bool use_11b, enable_qos;
1076         int aCWmin, aCWmax;
1077
1078         if (!local->ops->conf_tx)
1079                 return;
1080
1081         if (local->hw.queues < IEEE80211_NUM_ACS)
1082                 return;
1083
1084         memset(&qparam, 0, sizeof(qparam));
1085
1086         rcu_read_lock();
1087         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1088         use_11b = (chanctx_conf &&
1089                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1090                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1091         rcu_read_unlock();
1092
1093         /*
1094          * By default disable QoS in STA mode for old access points, which do
1095          * not support 802.11e. New APs will provide proper queue parameters,
1096          * that we will configure later.
1097          */
1098         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
1099
1100         /* Set defaults according to 802.11-2007 Table 7-37 */
1101         aCWmax = 1023;
1102         if (use_11b)
1103                 aCWmin = 31;
1104         else
1105                 aCWmin = 15;
1106
1107         /* Confiure old 802.11b/g medium access rules. */
1108         qparam.cw_max = aCWmax;
1109         qparam.cw_min = aCWmin;
1110         qparam.txop = 0;
1111         qparam.aifs = 2;
1112
1113         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1114                 /* Update if QoS is enabled. */
1115                 if (enable_qos) {
1116                         switch (ac) {
1117                         case IEEE80211_AC_BK:
1118                                 qparam.cw_max = aCWmax;
1119                                 qparam.cw_min = aCWmin;
1120                                 qparam.txop = 0;
1121                                 qparam.aifs = 7;
1122                                 break;
1123                         /* never happens but let's not leave undefined */
1124                         default:
1125                         case IEEE80211_AC_BE:
1126                                 qparam.cw_max = aCWmax;
1127                                 qparam.cw_min = aCWmin;
1128                                 qparam.txop = 0;
1129                                 qparam.aifs = 3;
1130                                 break;
1131                         case IEEE80211_AC_VI:
1132                                 qparam.cw_max = aCWmin;
1133                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1134                                 if (use_11b)
1135                                         qparam.txop = 6016/32;
1136                                 else
1137                                         qparam.txop = 3008/32;
1138                                 qparam.aifs = 2;
1139                                 break;
1140                         case IEEE80211_AC_VO:
1141                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1142                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1143                                 if (use_11b)
1144                                         qparam.txop = 3264/32;
1145                                 else
1146                                         qparam.txop = 1504/32;
1147                                 qparam.aifs = 2;
1148                                 break;
1149                         }
1150                 }
1151
1152                 qparam.uapsd = false;
1153
1154                 sdata->tx_conf[ac] = qparam;
1155                 drv_conf_tx(local, sdata, ac, &qparam);
1156         }
1157
1158         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1159             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1160                 sdata->vif.bss_conf.qos = enable_qos;
1161                 if (bss_notify)
1162                         ieee80211_bss_info_change_notify(sdata,
1163                                                          BSS_CHANGED_QOS);
1164         }
1165 }
1166
1167 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1168                          u16 transaction, u16 auth_alg, u16 status,
1169                          const u8 *extra, size_t extra_len, const u8 *da,
1170                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1171                          u32 tx_flags)
1172 {
1173         struct ieee80211_local *local = sdata->local;
1174         struct sk_buff *skb;
1175         struct ieee80211_mgmt *mgmt;
1176         int err;
1177
1178         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1179         skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
1180                             24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
1181         if (!skb)
1182                 return;
1183
1184         skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
1185
1186         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1187         memset(mgmt, 0, 24 + 6);
1188         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1189                                           IEEE80211_STYPE_AUTH);
1190         memcpy(mgmt->da, da, ETH_ALEN);
1191         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1192         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1193         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1194         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1195         mgmt->u.auth.status_code = cpu_to_le16(status);
1196         if (extra)
1197                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1198
1199         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1200                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1201                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1202                 WARN_ON(err);
1203         }
1204
1205         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1206                                         tx_flags;
1207         ieee80211_tx_skb(sdata, skb);
1208 }
1209
1210 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1211                                     const u8 *bssid, u16 stype, u16 reason,
1212                                     bool send_frame, u8 *frame_buf)
1213 {
1214         struct ieee80211_local *local = sdata->local;
1215         struct sk_buff *skb;
1216         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1217
1218         /* build frame */
1219         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1220         mgmt->duration = 0; /* initialize only */
1221         mgmt->seq_ctrl = 0; /* initialize only */
1222         memcpy(mgmt->da, bssid, ETH_ALEN);
1223         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1224         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1225         /* u.deauth.reason_code == u.disassoc.reason_code */
1226         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1227
1228         if (send_frame) {
1229                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1230                                     IEEE80211_DEAUTH_FRAME_LEN);
1231                 if (!skb)
1232                         return;
1233
1234                 skb_reserve(skb, local->hw.extra_tx_headroom);
1235
1236                 /* copy in frame */
1237                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1238                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1239
1240                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1241                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1242                         IEEE80211_SKB_CB(skb)->flags |=
1243                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1244
1245                 ieee80211_tx_skb(sdata, skb);
1246         }
1247 }
1248
1249 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
1250                                          u8 *buffer, size_t buffer_len,
1251                                          const u8 *ie, size_t ie_len,
1252                                          enum ieee80211_band band,
1253                                          u32 rate_mask,
1254                                          struct cfg80211_chan_def *chandef,
1255                                          size_t *offset)
1256 {
1257         struct ieee80211_supported_band *sband;
1258         u8 *pos = buffer, *end = buffer + buffer_len;
1259         size_t noffset;
1260         int supp_rates_len, i;
1261         u8 rates[32];
1262         int num_rates;
1263         int ext_rates_len;
1264         int shift;
1265         u32 rate_flags;
1266
1267         *offset = 0;
1268
1269         sband = local->hw.wiphy->bands[band];
1270         if (WARN_ON_ONCE(!sband))
1271                 return 0;
1272
1273         rate_flags = ieee80211_chandef_rate_flags(chandef);
1274         shift = ieee80211_chandef_get_shift(chandef);
1275
1276         num_rates = 0;
1277         for (i = 0; i < sband->n_bitrates; i++) {
1278                 if ((BIT(i) & rate_mask) == 0)
1279                         continue; /* skip rate */
1280                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1281                         continue;
1282
1283                 rates[num_rates++] =
1284                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1285                                           (1 << shift) * 5);
1286         }
1287
1288         supp_rates_len = min_t(int, num_rates, 8);
1289
1290         if (end - pos < 2 + supp_rates_len)
1291                 goto out_err;
1292         *pos++ = WLAN_EID_SUPP_RATES;
1293         *pos++ = supp_rates_len;
1294         memcpy(pos, rates, supp_rates_len);
1295         pos += supp_rates_len;
1296
1297         /* insert "request information" if in custom IEs */
1298         if (ie && ie_len) {
1299                 static const u8 before_extrates[] = {
1300                         WLAN_EID_SSID,
1301                         WLAN_EID_SUPP_RATES,
1302                         WLAN_EID_REQUEST,
1303                 };
1304                 noffset = ieee80211_ie_split(ie, ie_len,
1305                                              before_extrates,
1306                                              ARRAY_SIZE(before_extrates),
1307                                              *offset);
1308                 if (end - pos < noffset - *offset)
1309                         goto out_err;
1310                 memcpy(pos, ie + *offset, noffset - *offset);
1311                 pos += noffset - *offset;
1312                 *offset = noffset;
1313         }
1314
1315         ext_rates_len = num_rates - supp_rates_len;
1316         if (ext_rates_len > 0) {
1317                 if (end - pos < 2 + ext_rates_len)
1318                         goto out_err;
1319                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1320                 *pos++ = ext_rates_len;
1321                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1322                 pos += ext_rates_len;
1323         }
1324
1325         if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1326                 if (end - pos < 3)
1327                         goto out_err;
1328                 *pos++ = WLAN_EID_DS_PARAMS;
1329                 *pos++ = 1;
1330                 *pos++ = ieee80211_frequency_to_channel(
1331                                 chandef->chan->center_freq);
1332         }
1333
1334         /* insert custom IEs that go before HT */
1335         if (ie && ie_len) {
1336                 static const u8 before_ht[] = {
1337                         WLAN_EID_SSID,
1338                         WLAN_EID_SUPP_RATES,
1339                         WLAN_EID_REQUEST,
1340                         WLAN_EID_EXT_SUPP_RATES,
1341                         WLAN_EID_DS_PARAMS,
1342                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1343                 };
1344                 noffset = ieee80211_ie_split(ie, ie_len,
1345                                              before_ht, ARRAY_SIZE(before_ht),
1346                                              *offset);
1347                 if (end - pos < noffset - *offset)
1348                         goto out_err;
1349                 memcpy(pos, ie + *offset, noffset - *offset);
1350                 pos += noffset - *offset;
1351                 *offset = noffset;
1352         }
1353
1354         if (sband->ht_cap.ht_supported) {
1355                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1356                         goto out_err;
1357                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1358                                                 sband->ht_cap.cap);
1359         }
1360
1361         /*
1362          * If adding more here, adjust code in main.c
1363          * that calculates local->scan_ies_len.
1364          */
1365
1366         /* insert custom IEs that go before VHT */
1367         if (ie && ie_len) {
1368                 static const u8 before_vht[] = {
1369                         WLAN_EID_SSID,
1370                         WLAN_EID_SUPP_RATES,
1371                         WLAN_EID_REQUEST,
1372                         WLAN_EID_EXT_SUPP_RATES,
1373                         WLAN_EID_DS_PARAMS,
1374                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1375                         WLAN_EID_HT_CAPABILITY,
1376                         WLAN_EID_BSS_COEX_2040,
1377                         WLAN_EID_EXT_CAPABILITY,
1378                         WLAN_EID_SSID_LIST,
1379                         WLAN_EID_CHANNEL_USAGE,
1380                         WLAN_EID_INTERWORKING,
1381                         /* mesh ID can't happen here */
1382                         /* 60 GHz can't happen here right now */
1383                 };
1384                 noffset = ieee80211_ie_split(ie, ie_len,
1385                                              before_vht, ARRAY_SIZE(before_vht),
1386                                              *offset);
1387                 if (end - pos < noffset - *offset)
1388                         goto out_err;
1389                 memcpy(pos, ie + *offset, noffset - *offset);
1390                 pos += noffset - *offset;
1391                 *offset = noffset;
1392         }
1393
1394         if (sband->vht_cap.vht_supported) {
1395                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1396                         goto out_err;
1397                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1398                                                  sband->vht_cap.cap);
1399         }
1400
1401         return pos - buffer;
1402  out_err:
1403         WARN_ONCE(1, "not enough space for preq IEs\n");
1404         return pos - buffer;
1405 }
1406
1407 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1408                              size_t buffer_len,
1409                              struct ieee80211_scan_ies *ie_desc,
1410                              const u8 *ie, size_t ie_len,
1411                              u8 bands_used, u32 *rate_masks,
1412                              struct cfg80211_chan_def *chandef)
1413 {
1414         size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
1415         int i;
1416
1417         memset(ie_desc, 0, sizeof(*ie_desc));
1418
1419         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1420                 if (bands_used & BIT(i)) {
1421                         pos += ieee80211_build_preq_ies_band(local,
1422                                                              buffer + pos,
1423                                                              buffer_len - pos,
1424                                                              ie, ie_len, i,
1425                                                              rate_masks[i],
1426                                                              chandef,
1427                                                              &custom_ie_offset);
1428                         ie_desc->ies[i] = buffer + old_pos;
1429                         ie_desc->len[i] = pos - old_pos;
1430                         old_pos = pos;
1431                 }
1432         }
1433
1434         /* add any remaining custom IEs */
1435         if (ie && ie_len) {
1436                 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
1437                               "not enough space for preq custom IEs\n"))
1438                         return pos;
1439                 memcpy(buffer + pos, ie + custom_ie_offset,
1440                        ie_len - custom_ie_offset);
1441                 ie_desc->common_ies = buffer + pos;
1442                 ie_desc->common_ie_len = ie_len - custom_ie_offset;
1443                 pos += ie_len - custom_ie_offset;
1444         }
1445
1446         return pos;
1447 };
1448
1449 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1450                                           u8 *dst, u32 ratemask,
1451                                           struct ieee80211_channel *chan,
1452                                           const u8 *ssid, size_t ssid_len,
1453                                           const u8 *ie, size_t ie_len,
1454                                           bool directed)
1455 {
1456         struct ieee80211_local *local = sdata->local;
1457         struct cfg80211_chan_def chandef;
1458         struct sk_buff *skb;
1459         struct ieee80211_mgmt *mgmt;
1460         int ies_len;
1461         u32 rate_masks[IEEE80211_NUM_BANDS] = {};
1462         struct ieee80211_scan_ies dummy_ie_desc;
1463
1464         /*
1465          * Do not send DS Channel parameter for directed probe requests
1466          * in order to maximize the chance that we get a response.  Some
1467          * badly-behaved APs don't respond when this parameter is included.
1468          */
1469         chandef.width = sdata->vif.bss_conf.chandef.width;
1470         if (directed)
1471                 chandef.chan = NULL;
1472         else
1473                 chandef.chan = chan;
1474
1475         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1476                                      ssid, ssid_len, 100 + ie_len);
1477         if (!skb)
1478                 return NULL;
1479
1480         rate_masks[chan->band] = ratemask;
1481         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1482                                            skb_tailroom(skb), &dummy_ie_desc,
1483                                            ie, ie_len, BIT(chan->band),
1484                                            rate_masks, &chandef);
1485         skb_put(skb, ies_len);
1486
1487         if (dst) {
1488                 mgmt = (struct ieee80211_mgmt *) skb->data;
1489                 memcpy(mgmt->da, dst, ETH_ALEN);
1490                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1491         }
1492
1493         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1494
1495         return skb;
1496 }
1497
1498 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1499                               const u8 *ssid, size_t ssid_len,
1500                               const u8 *ie, size_t ie_len,
1501                               u32 ratemask, bool directed, u32 tx_flags,
1502                               struct ieee80211_channel *channel, bool scan)
1503 {
1504         struct sk_buff *skb;
1505
1506         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1507                                         ssid, ssid_len,
1508                                         ie, ie_len, directed);
1509         if (skb) {
1510                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1511                 if (scan)
1512                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1513                 else
1514                         ieee80211_tx_skb(sdata, skb);
1515         }
1516 }
1517
1518 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1519                             struct ieee802_11_elems *elems,
1520                             enum ieee80211_band band, u32 *basic_rates)
1521 {
1522         struct ieee80211_supported_band *sband;
1523         size_t num_rates;
1524         u32 supp_rates, rate_flags;
1525         int i, j, shift;
1526         sband = sdata->local->hw.wiphy->bands[band];
1527
1528         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1529         shift = ieee80211_vif_get_shift(&sdata->vif);
1530
1531         if (WARN_ON(!sband))
1532                 return 1;
1533
1534         num_rates = sband->n_bitrates;
1535         supp_rates = 0;
1536         for (i = 0; i < elems->supp_rates_len +
1537                      elems->ext_supp_rates_len; i++) {
1538                 u8 rate = 0;
1539                 int own_rate;
1540                 bool is_basic;
1541                 if (i < elems->supp_rates_len)
1542                         rate = elems->supp_rates[i];
1543                 else if (elems->ext_supp_rates)
1544                         rate = elems->ext_supp_rates
1545                                 [i - elems->supp_rates_len];
1546                 own_rate = 5 * (rate & 0x7f);
1547                 is_basic = !!(rate & 0x80);
1548
1549                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1550                         continue;
1551
1552                 for (j = 0; j < num_rates; j++) {
1553                         int brate;
1554                         if ((rate_flags & sband->bitrates[j].flags)
1555                             != rate_flags)
1556                                 continue;
1557
1558                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1559                                              1 << shift);
1560
1561                         if (brate == own_rate) {
1562                                 supp_rates |= BIT(j);
1563                                 if (basic_rates && is_basic)
1564                                         *basic_rates |= BIT(j);
1565                         }
1566                 }
1567         }
1568         return supp_rates;
1569 }
1570
1571 void ieee80211_stop_device(struct ieee80211_local *local)
1572 {
1573         ieee80211_led_radio(local, false);
1574         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1575
1576         cancel_work_sync(&local->reconfig_filter);
1577
1578         flush_workqueue(local->workqueue);
1579         drv_stop(local);
1580 }
1581
1582 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1583 {
1584         struct ieee80211_sub_if_data *sdata;
1585         struct ieee80211_chanctx *ctx;
1586
1587         /*
1588          * We get here if during resume the device can't be restarted properly.
1589          * We might also get here if this happens during HW reset, which is a
1590          * slightly different situation and we need to drop all connections in
1591          * the latter case.
1592          *
1593          * Ask cfg80211 to turn off all interfaces, this will result in more
1594          * warnings but at least we'll then get into a clean stopped state.
1595          */
1596
1597         local->resuming = false;
1598         local->suspended = false;
1599         local->started = false;
1600
1601         /* scheduled scan clearly can't be running any more, but tell
1602          * cfg80211 and clear local state
1603          */
1604         ieee80211_sched_scan_end(local);
1605
1606         list_for_each_entry(sdata, &local->interfaces, list)
1607                 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1608
1609         /* Mark channel contexts as not being in the driver any more to avoid
1610          * removing them from the driver during the shutdown process...
1611          */
1612         mutex_lock(&local->chanctx_mtx);
1613         list_for_each_entry(ctx, &local->chanctx_list, list)
1614                 ctx->driver_present = false;
1615         mutex_unlock(&local->chanctx_mtx);
1616
1617         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1618 }
1619
1620 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1621                                      struct ieee80211_sub_if_data *sdata)
1622 {
1623         struct ieee80211_chanctx_conf *conf;
1624         struct ieee80211_chanctx *ctx;
1625
1626         if (!local->use_chanctx)
1627                 return;
1628
1629         mutex_lock(&local->chanctx_mtx);
1630         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1631                                          lockdep_is_held(&local->chanctx_mtx));
1632         if (conf) {
1633                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1634                 drv_assign_vif_chanctx(local, sdata, ctx);
1635         }
1636         mutex_unlock(&local->chanctx_mtx);
1637 }
1638
1639 int ieee80211_reconfig(struct ieee80211_local *local)
1640 {
1641         struct ieee80211_hw *hw = &local->hw;
1642         struct ieee80211_sub_if_data *sdata;
1643         struct ieee80211_chanctx *ctx;
1644         struct sta_info *sta;
1645         int res, i;
1646         bool reconfig_due_to_wowlan = false;
1647         struct ieee80211_sub_if_data *sched_scan_sdata;
1648         bool sched_scan_stopped = false;
1649
1650 #ifdef CONFIG_PM
1651         if (local->suspended)
1652                 local->resuming = true;
1653
1654         if (local->wowlan) {
1655                 res = drv_resume(local);
1656                 local->wowlan = false;
1657                 if (res < 0) {
1658                         local->resuming = false;
1659                         return res;
1660                 }
1661                 if (res == 0)
1662                         goto wake_up;
1663                 WARN_ON(res > 1);
1664                 /*
1665                  * res is 1, which means the driver requested
1666                  * to go through a regular reset on wakeup.
1667                  */
1668                 reconfig_due_to_wowlan = true;
1669         }
1670 #endif
1671         /* everything else happens only if HW was up & running */
1672         if (!local->open_count)
1673                 goto wake_up;
1674
1675         /*
1676          * Upon resume hardware can sometimes be goofy due to
1677          * various platform / driver / bus issues, so restarting
1678          * the device may at times not work immediately. Propagate
1679          * the error.
1680          */
1681         res = drv_start(local);
1682         if (res) {
1683                 if (local->suspended)
1684                         WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1685                 else
1686                         WARN(1, "Hardware became unavailable during restart.\n");
1687                 ieee80211_handle_reconfig_failure(local);
1688                 return res;
1689         }
1690
1691         /* setup fragmentation threshold */
1692         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1693
1694         /* setup RTS threshold */
1695         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1696
1697         /* reset coverage class */
1698         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1699
1700         ieee80211_led_radio(local, true);
1701         ieee80211_mod_tpt_led_trig(local,
1702                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1703
1704         /* add interfaces */
1705         sdata = rtnl_dereference(local->monitor_sdata);
1706         if (sdata) {
1707                 /* in HW restart it exists already */
1708                 WARN_ON(local->resuming);
1709                 res = drv_add_interface(local, sdata);
1710                 if (WARN_ON(res)) {
1711                         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1712                         synchronize_net();
1713                         kfree(sdata);
1714                 }
1715         }
1716
1717         list_for_each_entry(sdata, &local->interfaces, list) {
1718                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1719                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1720                     ieee80211_sdata_running(sdata))
1721                         res = drv_add_interface(local, sdata);
1722         }
1723
1724         /* add channel contexts */
1725         if (local->use_chanctx) {
1726                 mutex_lock(&local->chanctx_mtx);
1727                 list_for_each_entry(ctx, &local->chanctx_list, list)
1728                         if (ctx->replace_state !=
1729                             IEEE80211_CHANCTX_REPLACES_OTHER)
1730                                 WARN_ON(drv_add_chanctx(local, ctx));
1731                 mutex_unlock(&local->chanctx_mtx);
1732
1733                 list_for_each_entry(sdata, &local->interfaces, list) {
1734                         if (!ieee80211_sdata_running(sdata))
1735                                 continue;
1736                         ieee80211_assign_chanctx(local, sdata);
1737                 }
1738
1739                 sdata = rtnl_dereference(local->monitor_sdata);
1740                 if (sdata && ieee80211_sdata_running(sdata))
1741                         ieee80211_assign_chanctx(local, sdata);
1742         }
1743
1744         /* add STAs back */
1745         mutex_lock(&local->sta_mtx);
1746         list_for_each_entry(sta, &local->sta_list, list) {
1747                 enum ieee80211_sta_state state;
1748
1749                 if (!sta->uploaded)
1750                         continue;
1751
1752                 /* AP-mode stations will be added later */
1753                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1754                         continue;
1755
1756                 for (state = IEEE80211_STA_NOTEXIST;
1757                      state < sta->sta_state; state++)
1758                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1759                                               state + 1));
1760         }
1761         mutex_unlock(&local->sta_mtx);
1762
1763         /* reconfigure tx conf */
1764         if (hw->queues >= IEEE80211_NUM_ACS) {
1765                 list_for_each_entry(sdata, &local->interfaces, list) {
1766                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1767                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1768                             !ieee80211_sdata_running(sdata))
1769                                 continue;
1770
1771                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1772                                 drv_conf_tx(local, sdata, i,
1773                                             &sdata->tx_conf[i]);
1774                 }
1775         }
1776
1777         /* reconfigure hardware */
1778         ieee80211_hw_config(local, ~0);
1779
1780         ieee80211_configure_filter(local);
1781
1782         /* Finally also reconfigure all the BSS information */
1783         list_for_each_entry(sdata, &local->interfaces, list) {
1784                 u32 changed;
1785
1786                 if (!ieee80211_sdata_running(sdata))
1787                         continue;
1788
1789                 /* common change flags for all interface types */
1790                 changed = BSS_CHANGED_ERP_CTS_PROT |
1791                           BSS_CHANGED_ERP_PREAMBLE |
1792                           BSS_CHANGED_ERP_SLOT |
1793                           BSS_CHANGED_HT |
1794                           BSS_CHANGED_BASIC_RATES |
1795                           BSS_CHANGED_BEACON_INT |
1796                           BSS_CHANGED_BSSID |
1797                           BSS_CHANGED_CQM |
1798                           BSS_CHANGED_QOS |
1799                           BSS_CHANGED_IDLE |
1800                           BSS_CHANGED_TXPOWER;
1801
1802                 switch (sdata->vif.type) {
1803                 case NL80211_IFTYPE_STATION:
1804                         changed |= BSS_CHANGED_ASSOC |
1805                                    BSS_CHANGED_ARP_FILTER |
1806                                    BSS_CHANGED_PS;
1807
1808                         /* Re-send beacon info report to the driver */
1809                         if (sdata->u.mgd.have_beacon)
1810                                 changed |= BSS_CHANGED_BEACON_INFO;
1811
1812                         sdata_lock(sdata);
1813                         ieee80211_bss_info_change_notify(sdata, changed);
1814                         sdata_unlock(sdata);
1815                         break;
1816                 case NL80211_IFTYPE_ADHOC:
1817                         changed |= BSS_CHANGED_IBSS;
1818                         /* fall through */
1819                 case NL80211_IFTYPE_AP:
1820                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1821
1822                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1823                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1824
1825                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1826                                         drv_start_ap(local, sdata);
1827                         }
1828
1829                         /* fall through */
1830                 case NL80211_IFTYPE_MESH_POINT:
1831                         if (sdata->vif.bss_conf.enable_beacon) {
1832                                 changed |= BSS_CHANGED_BEACON |
1833                                            BSS_CHANGED_BEACON_ENABLED;
1834                                 ieee80211_bss_info_change_notify(sdata, changed);
1835                         }
1836                         break;
1837                 case NL80211_IFTYPE_WDS:
1838                 case NL80211_IFTYPE_AP_VLAN:
1839                 case NL80211_IFTYPE_MONITOR:
1840                 case NL80211_IFTYPE_P2P_DEVICE:
1841                         /* nothing to do */
1842                         break;
1843                 case NL80211_IFTYPE_UNSPECIFIED:
1844                 case NUM_NL80211_IFTYPES:
1845                 case NL80211_IFTYPE_P2P_CLIENT:
1846                 case NL80211_IFTYPE_P2P_GO:
1847                         WARN_ON(1);
1848                         break;
1849                 }
1850         }
1851
1852         ieee80211_recalc_ps(local, -1);
1853
1854         /*
1855          * The sta might be in psm against the ap (e.g. because
1856          * this was the state before a hw restart), so we
1857          * explicitly send a null packet in order to make sure
1858          * it'll sync against the ap (and get out of psm).
1859          */
1860         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1861                 list_for_each_entry(sdata, &local->interfaces, list) {
1862                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1863                                 continue;
1864                         if (!sdata->u.mgd.associated)
1865                                 continue;
1866
1867                         ieee80211_send_nullfunc(local, sdata, 0);
1868                 }
1869         }
1870
1871         /* APs are now beaconing, add back stations */
1872         mutex_lock(&local->sta_mtx);
1873         list_for_each_entry(sta, &local->sta_list, list) {
1874                 enum ieee80211_sta_state state;
1875
1876                 if (!sta->uploaded)
1877                         continue;
1878
1879                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1880                         continue;
1881
1882                 for (state = IEEE80211_STA_NOTEXIST;
1883                      state < sta->sta_state; state++)
1884                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1885                                               state + 1));
1886         }
1887         mutex_unlock(&local->sta_mtx);
1888
1889         /* add back keys */
1890         list_for_each_entry(sdata, &local->interfaces, list)
1891                 if (ieee80211_sdata_running(sdata))
1892                         ieee80211_enable_keys(sdata);
1893
1894  wake_up:
1895         local->in_reconfig = false;
1896         barrier();
1897
1898         if (local->monitors == local->open_count && local->monitors > 0)
1899                 ieee80211_add_virtual_monitor(local);
1900
1901         /*
1902          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1903          * sessions can be established after a resume.
1904          *
1905          * Also tear down aggregation sessions since reconfiguring
1906          * them in a hardware restart scenario is not easily done
1907          * right now, and the hardware will have lost information
1908          * about the sessions, but we and the AP still think they
1909          * are active. This is really a workaround though.
1910          */
1911         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1912                 mutex_lock(&local->sta_mtx);
1913
1914                 list_for_each_entry(sta, &local->sta_list, list) {
1915                         ieee80211_sta_tear_down_BA_sessions(
1916                                         sta, AGG_STOP_LOCAL_REQUEST);
1917                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1918                 }
1919
1920                 mutex_unlock(&local->sta_mtx);
1921         }
1922
1923         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1924                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
1925                                         false);
1926
1927         /*
1928          * Reconfigure sched scan if it was interrupted by FW restart or
1929          * suspend.
1930          */
1931         mutex_lock(&local->mtx);
1932         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1933                                                 lockdep_is_held(&local->mtx));
1934         if (sched_scan_sdata && local->sched_scan_req)
1935                 /*
1936                  * Sched scan stopped, but we don't want to report it. Instead,
1937                  * we're trying to reschedule.
1938                  */
1939                 if (__ieee80211_request_sched_scan_start(sched_scan_sdata,
1940                                                          local->sched_scan_req))
1941                         sched_scan_stopped = true;
1942         mutex_unlock(&local->mtx);
1943
1944         if (sched_scan_stopped)
1945                 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
1946
1947         /*
1948          * If this is for hw restart things are still running.
1949          * We may want to change that later, however.
1950          */
1951         if (!local->suspended || reconfig_due_to_wowlan)
1952                 drv_restart_complete(local);
1953
1954         if (!local->suspended)
1955                 return 0;
1956
1957 #ifdef CONFIG_PM
1958         /* first set suspended false, then resuming */
1959         local->suspended = false;
1960         mb();
1961         local->resuming = false;
1962
1963         list_for_each_entry(sdata, &local->interfaces, list) {
1964                 if (!ieee80211_sdata_running(sdata))
1965                         continue;
1966                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1967                         ieee80211_sta_restart(sdata);
1968         }
1969
1970         mod_timer(&local->sta_cleanup, jiffies + 1);
1971 #else
1972         WARN_ON(1);
1973 #endif
1974
1975         return 0;
1976 }
1977
1978 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1979 {
1980         struct ieee80211_sub_if_data *sdata;
1981         struct ieee80211_local *local;
1982         struct ieee80211_key *key;
1983
1984         if (WARN_ON(!vif))
1985                 return;
1986
1987         sdata = vif_to_sdata(vif);
1988         local = sdata->local;
1989
1990         if (WARN_ON(!local->resuming))
1991                 return;
1992
1993         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1994                 return;
1995
1996         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1997
1998         mutex_lock(&local->key_mtx);
1999         list_for_each_entry(key, &sdata->key_list, list)
2000                 key->flags |= KEY_FLAG_TAINTED;
2001         mutex_unlock(&local->key_mtx);
2002 }
2003 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
2004
2005 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
2006 {
2007         struct ieee80211_local *local = sdata->local;
2008         struct ieee80211_chanctx_conf *chanctx_conf;
2009         struct ieee80211_chanctx *chanctx;
2010
2011         mutex_lock(&local->chanctx_mtx);
2012
2013         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2014                                         lockdep_is_held(&local->chanctx_mtx));
2015
2016         if (WARN_ON_ONCE(!chanctx_conf))
2017                 goto unlock;
2018
2019         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2020         ieee80211_recalc_smps_chanctx(local, chanctx);
2021  unlock:
2022         mutex_unlock(&local->chanctx_mtx);
2023 }
2024
2025 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
2026 {
2027         struct ieee80211_local *local = sdata->local;
2028         struct ieee80211_chanctx_conf *chanctx_conf;
2029         struct ieee80211_chanctx *chanctx;
2030
2031         mutex_lock(&local->chanctx_mtx);
2032
2033         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2034                                         lockdep_is_held(&local->chanctx_mtx));
2035
2036         if (WARN_ON_ONCE(!chanctx_conf))
2037                 goto unlock;
2038
2039         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2040         ieee80211_recalc_chanctx_min_def(local, chanctx);
2041  unlock:
2042         mutex_unlock(&local->chanctx_mtx);
2043 }
2044
2045 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
2046 {
2047         int i;
2048
2049         for (i = 0; i < n_ids; i++)
2050                 if (ids[i] == id)
2051                         return true;
2052         return false;
2053 }
2054
2055 /**
2056  * ieee80211_ie_split - split an IE buffer according to ordering
2057  *
2058  * @ies: the IE buffer
2059  * @ielen: the length of the IE buffer
2060  * @ids: an array with element IDs that are allowed before
2061  *      the split
2062  * @n_ids: the size of the element ID array
2063  * @offset: offset where to start splitting in the buffer
2064  *
2065  * This function splits an IE buffer by updating the @offset
2066  * variable to point to the location where the buffer should be
2067  * split.
2068  *
2069  * It assumes that the given IE buffer is well-formed, this
2070  * has to be guaranteed by the caller!
2071  *
2072  * It also assumes that the IEs in the buffer are ordered
2073  * correctly, if not the result of using this function will not
2074  * be ordered correctly either, i.e. it does no reordering.
2075  *
2076  * The function returns the offset where the next part of the
2077  * buffer starts, which may be @ielen if the entire (remainder)
2078  * of the buffer should be used.
2079  */
2080 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
2081                           const u8 *ids, int n_ids, size_t offset)
2082 {
2083         size_t pos = offset;
2084
2085         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
2086                 pos += 2 + ies[pos + 1];
2087
2088         return pos;
2089 }
2090
2091 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
2092 {
2093         size_t pos = offset;
2094
2095         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
2096                 pos += 2 + ies[pos + 1];
2097
2098         return pos;
2099 }
2100
2101 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
2102                                             int rssi_min_thold,
2103                                             int rssi_max_thold)
2104 {
2105         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
2106
2107         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2108                 return;
2109
2110         /*
2111          * Scale up threshold values before storing it, as the RSSI averaging
2112          * algorithm uses a scaled up value as well. Change this scaling
2113          * factor if the RSSI averaging algorithm changes.
2114          */
2115         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
2116         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
2117 }
2118
2119 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
2120                                     int rssi_min_thold,
2121                                     int rssi_max_thold)
2122 {
2123         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2124
2125         WARN_ON(rssi_min_thold == rssi_max_thold ||
2126                 rssi_min_thold > rssi_max_thold);
2127
2128         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2129                                        rssi_max_thold);
2130 }
2131 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2132
2133 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2134 {
2135         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2136
2137         _ieee80211_enable_rssi_reports(sdata, 0, 0);
2138 }
2139 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2140
2141 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2142                               u16 cap)
2143 {
2144         __le16 tmp;
2145
2146         *pos++ = WLAN_EID_HT_CAPABILITY;
2147         *pos++ = sizeof(struct ieee80211_ht_cap);
2148         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2149
2150         /* capability flags */
2151         tmp = cpu_to_le16(cap);
2152         memcpy(pos, &tmp, sizeof(u16));
2153         pos += sizeof(u16);
2154
2155         /* AMPDU parameters */
2156         *pos++ = ht_cap->ampdu_factor |
2157                  (ht_cap->ampdu_density <<
2158                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2159
2160         /* MCS set */
2161         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2162         pos += sizeof(ht_cap->mcs);
2163
2164         /* extended capabilities */
2165         pos += sizeof(__le16);
2166
2167         /* BF capabilities */
2168         pos += sizeof(__le32);
2169
2170         /* antenna selection */
2171         pos += sizeof(u8);
2172
2173         return pos;
2174 }
2175
2176 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2177                                u32 cap)
2178 {
2179         __le32 tmp;
2180
2181         *pos++ = WLAN_EID_VHT_CAPABILITY;
2182         *pos++ = sizeof(struct ieee80211_vht_cap);
2183         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2184
2185         /* capability flags */
2186         tmp = cpu_to_le32(cap);
2187         memcpy(pos, &tmp, sizeof(u32));
2188         pos += sizeof(u32);
2189
2190         /* VHT MCS set */
2191         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2192         pos += sizeof(vht_cap->vht_mcs);
2193
2194         return pos;
2195 }
2196
2197 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2198                                const struct cfg80211_chan_def *chandef,
2199                                u16 prot_mode)
2200 {
2201         struct ieee80211_ht_operation *ht_oper;
2202         /* Build HT Information */
2203         *pos++ = WLAN_EID_HT_OPERATION;
2204         *pos++ = sizeof(struct ieee80211_ht_operation);
2205         ht_oper = (struct ieee80211_ht_operation *)pos;
2206         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2207                                         chandef->chan->center_freq);
2208         switch (chandef->width) {
2209         case NL80211_CHAN_WIDTH_160:
2210         case NL80211_CHAN_WIDTH_80P80:
2211         case NL80211_CHAN_WIDTH_80:
2212         case NL80211_CHAN_WIDTH_40:
2213                 if (chandef->center_freq1 > chandef->chan->center_freq)
2214                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2215                 else
2216                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2217                 break;
2218         default:
2219                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2220                 break;
2221         }
2222         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2223             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2224             chandef->width != NL80211_CHAN_WIDTH_20)
2225                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2226
2227         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2228         ht_oper->stbc_param = 0x0000;
2229
2230         /* It seems that Basic MCS set and Supported MCS set
2231            are identical for the first 10 bytes */
2232         memset(&ht_oper->basic_set, 0, 16);
2233         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2234
2235         return pos + sizeof(struct ieee80211_ht_operation);
2236 }
2237
2238 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2239                                   const struct ieee80211_ht_operation *ht_oper,
2240                                   struct cfg80211_chan_def *chandef)
2241 {
2242         enum nl80211_channel_type channel_type;
2243
2244         if (!ht_oper) {
2245                 cfg80211_chandef_create(chandef, control_chan,
2246                                         NL80211_CHAN_NO_HT);
2247                 return;
2248         }
2249
2250         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2251         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2252                 channel_type = NL80211_CHAN_HT20;
2253                 break;
2254         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2255                 channel_type = NL80211_CHAN_HT40PLUS;
2256                 break;
2257         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2258                 channel_type = NL80211_CHAN_HT40MINUS;
2259                 break;
2260         default:
2261                 channel_type = NL80211_CHAN_NO_HT;
2262         }
2263
2264         cfg80211_chandef_create(chandef, control_chan, channel_type);
2265 }
2266
2267 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2268                              const struct ieee80211_supported_band *sband,
2269                              const u8 *srates, int srates_len, u32 *rates)
2270 {
2271         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2272         int shift = ieee80211_chandef_get_shift(chandef);
2273         struct ieee80211_rate *br;
2274         int brate, rate, i, j, count = 0;
2275
2276         *rates = 0;
2277
2278         for (i = 0; i < srates_len; i++) {
2279                 rate = srates[i] & 0x7f;
2280
2281                 for (j = 0; j < sband->n_bitrates; j++) {
2282                         br = &sband->bitrates[j];
2283                         if ((rate_flags & br->flags) != rate_flags)
2284                                 continue;
2285
2286                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2287                         if (brate == rate) {
2288                                 *rates |= BIT(j);
2289                                 count++;
2290                                 break;
2291                         }
2292                 }
2293         }
2294         return count;
2295 }
2296
2297 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2298                             struct sk_buff *skb, bool need_basic,
2299                             enum ieee80211_band band)
2300 {
2301         struct ieee80211_local *local = sdata->local;
2302         struct ieee80211_supported_band *sband;
2303         int rate, shift;
2304         u8 i, rates, *pos;
2305         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2306         u32 rate_flags;
2307
2308         shift = ieee80211_vif_get_shift(&sdata->vif);
2309         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2310         sband = local->hw.wiphy->bands[band];
2311         rates = 0;
2312         for (i = 0; i < sband->n_bitrates; i++) {
2313                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2314                         continue;
2315                 rates++;
2316         }
2317         if (rates > 8)
2318                 rates = 8;
2319
2320         if (skb_tailroom(skb) < rates + 2)
2321                 return -ENOMEM;
2322
2323         pos = skb_put(skb, rates + 2);
2324         *pos++ = WLAN_EID_SUPP_RATES;
2325         *pos++ = rates;
2326         for (i = 0; i < rates; i++) {
2327                 u8 basic = 0;
2328                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2329                         continue;
2330
2331                 if (need_basic && basic_rates & BIT(i))
2332                         basic = 0x80;
2333                 rate = sband->bitrates[i].bitrate;
2334                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2335                                     5 * (1 << shift));
2336                 *pos++ = basic | (u8) rate;
2337         }
2338
2339         return 0;
2340 }
2341
2342 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2343                                 struct sk_buff *skb, bool need_basic,
2344                                 enum ieee80211_band band)
2345 {
2346         struct ieee80211_local *local = sdata->local;
2347         struct ieee80211_supported_band *sband;
2348         int rate, shift;
2349         u8 i, exrates, *pos;
2350         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2351         u32 rate_flags;
2352
2353         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2354         shift = ieee80211_vif_get_shift(&sdata->vif);
2355
2356         sband = local->hw.wiphy->bands[band];
2357         exrates = 0;
2358         for (i = 0; i < sband->n_bitrates; i++) {
2359                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2360                         continue;
2361                 exrates++;
2362         }
2363
2364         if (exrates > 8)
2365                 exrates -= 8;
2366         else
2367                 exrates = 0;
2368
2369         if (skb_tailroom(skb) < exrates + 2)
2370                 return -ENOMEM;
2371
2372         if (exrates) {
2373                 pos = skb_put(skb, exrates + 2);
2374                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2375                 *pos++ = exrates;
2376                 for (i = 8; i < sband->n_bitrates; i++) {
2377                         u8 basic = 0;
2378                         if ((rate_flags & sband->bitrates[i].flags)
2379                             != rate_flags)
2380                                 continue;
2381                         if (need_basic && basic_rates & BIT(i))
2382                                 basic = 0x80;
2383                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2384                                             5 * (1 << shift));
2385                         *pos++ = basic | (u8) rate;
2386                 }
2387         }
2388         return 0;
2389 }
2390
2391 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2392 {
2393         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2394         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2395
2396         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2397                 /* non-managed type inferfaces */
2398                 return 0;
2399         }
2400         return ifmgd->ave_beacon_signal / 16;
2401 }
2402 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2403
2404 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2405 {
2406         if (!mcs)
2407                 return 1;
2408
2409         /* TODO: consider rx_highest */
2410
2411         if (mcs->rx_mask[3])
2412                 return 4;
2413         if (mcs->rx_mask[2])
2414                 return 3;
2415         if (mcs->rx_mask[1])
2416                 return 2;
2417         return 1;
2418 }
2419
2420 /**
2421  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2422  * @local: mac80211 hw info struct
2423  * @status: RX status
2424  * @mpdu_len: total MPDU length (including FCS)
2425  * @mpdu_offset: offset into MPDU to calculate timestamp at
2426  *
2427  * This function calculates the RX timestamp at the given MPDU offset, taking
2428  * into account what the RX timestamp was. An offset of 0 will just normalize
2429  * the timestamp to TSF at beginning of MPDU reception.
2430  */
2431 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2432                                      struct ieee80211_rx_status *status,
2433                                      unsigned int mpdu_len,
2434                                      unsigned int mpdu_offset)
2435 {
2436         u64 ts = status->mactime;
2437         struct rate_info ri;
2438         u16 rate;
2439
2440         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2441                 return 0;
2442
2443         memset(&ri, 0, sizeof(ri));
2444
2445         /* Fill cfg80211 rate info */
2446         if (status->flag & RX_FLAG_HT) {
2447                 ri.mcs = status->rate_idx;
2448                 ri.flags |= RATE_INFO_FLAGS_MCS;
2449                 if (status->flag & RX_FLAG_40MHZ)
2450                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2451                 if (status->flag & RX_FLAG_SHORT_GI)
2452                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2453         } else if (status->flag & RX_FLAG_VHT) {
2454                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2455                 ri.mcs = status->rate_idx;
2456                 ri.nss = status->vht_nss;
2457                 if (status->flag & RX_FLAG_40MHZ)
2458                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2459                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2460                         ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2461                 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
2462                         ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2463                 if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2464                         ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2465                 if (status->flag & RX_FLAG_SHORT_GI)
2466                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2467         } else {
2468                 struct ieee80211_supported_band *sband;
2469                 int shift = 0;
2470                 int bitrate;
2471
2472                 if (status->flag & RX_FLAG_10MHZ)
2473                         shift = 1;
2474                 if (status->flag & RX_FLAG_5MHZ)
2475                         shift = 2;
2476
2477                 sband = local->hw.wiphy->bands[status->band];
2478                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2479                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2480         }
2481
2482         rate = cfg80211_calculate_bitrate(&ri);
2483         if (WARN_ONCE(!rate,
2484                       "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2485                       status->flag, status->rate_idx, status->vht_nss))
2486                 return 0;
2487
2488         /* rewind from end of MPDU */
2489         if (status->flag & RX_FLAG_MACTIME_END)
2490                 ts -= mpdu_len * 8 * 10 / rate;
2491
2492         ts += mpdu_offset * 8 * 10 / rate;
2493
2494         return ts;
2495 }
2496
2497 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2498 {
2499         struct ieee80211_sub_if_data *sdata;
2500         struct cfg80211_chan_def chandef;
2501
2502         mutex_lock(&local->mtx);
2503         mutex_lock(&local->iflist_mtx);
2504         list_for_each_entry(sdata, &local->interfaces, list) {
2505                 /* it might be waiting for the local->mtx, but then
2506                  * by the time it gets it, sdata->wdev.cac_started
2507                  * will no longer be true
2508                  */
2509                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2510
2511                 if (sdata->wdev.cac_started) {
2512                         chandef = sdata->vif.bss_conf.chandef;
2513                         ieee80211_vif_release_channel(sdata);
2514                         cfg80211_cac_event(sdata->dev,
2515                                            &chandef,
2516                                            NL80211_RADAR_CAC_ABORTED,
2517                                            GFP_KERNEL);
2518                 }
2519         }
2520         mutex_unlock(&local->iflist_mtx);
2521         mutex_unlock(&local->mtx);
2522 }
2523
2524 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2525 {
2526         struct ieee80211_local *local =
2527                 container_of(work, struct ieee80211_local, radar_detected_work);
2528         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2529
2530         ieee80211_dfs_cac_cancel(local);
2531
2532         if (local->use_chanctx)
2533                 /* currently not handled */
2534                 WARN_ON(1);
2535         else
2536                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2537 }
2538
2539 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2540 {
2541         struct ieee80211_local *local = hw_to_local(hw);
2542
2543         trace_api_radar_detected(local);
2544
2545         ieee80211_queue_work(hw, &local->radar_detected_work);
2546 }
2547 EXPORT_SYMBOL(ieee80211_radar_detected);
2548
2549 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2550 {
2551         u32 ret;
2552         int tmp;
2553
2554         switch (c->width) {
2555         case NL80211_CHAN_WIDTH_20:
2556                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2557                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2558                 break;
2559         case NL80211_CHAN_WIDTH_40:
2560                 c->width = NL80211_CHAN_WIDTH_20;
2561                 c->center_freq1 = c->chan->center_freq;
2562                 ret = IEEE80211_STA_DISABLE_40MHZ |
2563                       IEEE80211_STA_DISABLE_VHT;
2564                 break;
2565         case NL80211_CHAN_WIDTH_80:
2566                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2567                 /* n_P40 */
2568                 tmp /= 2;
2569                 /* freq_P40 */
2570                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2571                 c->width = NL80211_CHAN_WIDTH_40;
2572                 ret = IEEE80211_STA_DISABLE_VHT;
2573                 break;
2574         case NL80211_CHAN_WIDTH_80P80:
2575                 c->center_freq2 = 0;
2576                 c->width = NL80211_CHAN_WIDTH_80;
2577                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2578                       IEEE80211_STA_DISABLE_160MHZ;
2579                 break;
2580         case NL80211_CHAN_WIDTH_160:
2581                 /* n_P20 */
2582                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2583                 /* n_P80 */
2584                 tmp /= 4;
2585                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2586                 c->width = NL80211_CHAN_WIDTH_80;
2587                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2588                       IEEE80211_STA_DISABLE_160MHZ;
2589                 break;
2590         default:
2591         case NL80211_CHAN_WIDTH_20_NOHT:
2592                 WARN_ON_ONCE(1);
2593                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2594                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2595                 break;
2596         case NL80211_CHAN_WIDTH_5:
2597         case NL80211_CHAN_WIDTH_10:
2598                 WARN_ON_ONCE(1);
2599                 /* keep c->width */
2600                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2601                 break;
2602         }
2603
2604         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2605
2606         return ret;
2607 }
2608
2609 /*
2610  * Returns true if smps_mode_new is strictly more restrictive than
2611  * smps_mode_old.
2612  */
2613 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2614                                    enum ieee80211_smps_mode smps_mode_new)
2615 {
2616         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2617                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2618                 return false;
2619
2620         switch (smps_mode_old) {
2621         case IEEE80211_SMPS_STATIC:
2622                 return false;
2623         case IEEE80211_SMPS_DYNAMIC:
2624                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2625         case IEEE80211_SMPS_OFF:
2626                 return smps_mode_new != IEEE80211_SMPS_OFF;
2627         default:
2628                 WARN_ON(1);
2629         }
2630
2631         return false;
2632 }
2633
2634 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2635                               struct cfg80211_csa_settings *csa_settings)
2636 {
2637         struct sk_buff *skb;
2638         struct ieee80211_mgmt *mgmt;
2639         struct ieee80211_local *local = sdata->local;
2640         int freq;
2641         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2642                                sizeof(mgmt->u.action.u.chan_switch);
2643         u8 *pos;
2644
2645         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2646             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2647                 return -EOPNOTSUPP;
2648
2649         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2650                             5 + /* channel switch announcement element */
2651                             3 + /* secondary channel offset element */
2652                             8); /* mesh channel switch parameters element */
2653         if (!skb)
2654                 return -ENOMEM;
2655
2656         skb_reserve(skb, local->tx_headroom);
2657         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2658         memset(mgmt, 0, hdr_len);
2659         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2660                                           IEEE80211_STYPE_ACTION);
2661
2662         eth_broadcast_addr(mgmt->da);
2663         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2664         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2665                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2666         } else {
2667                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2668                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2669         }
2670         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2671         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2672         pos = skb_put(skb, 5);
2673         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
2674         *pos++ = 3;                                             /* IE length */
2675         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
2676         freq = csa_settings->chandef.chan->center_freq;
2677         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
2678         *pos++ = csa_settings->count;                           /* count */
2679
2680         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2681                 enum nl80211_channel_type ch_type;
2682
2683                 skb_put(skb, 3);
2684                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
2685                 *pos++ = 1;                                     /* IE length */
2686                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2687                 if (ch_type == NL80211_CHAN_HT40PLUS)
2688                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2689                 else
2690                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2691         }
2692
2693         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2694                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2695
2696                 skb_put(skb, 8);
2697                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
2698                 *pos++ = 6;                                     /* IE length */
2699                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
2700                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
2701                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2702                 *pos++ |= csa_settings->block_tx ?
2703                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2704                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2705                 pos += 2;
2706                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2707                 pos += 2;
2708         }
2709
2710         ieee80211_tx_skb(sdata, skb);
2711         return 0;
2712 }
2713
2714 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2715 {
2716         return !(cs == NULL || cs->cipher == 0 ||
2717                  cs->hdr_len < cs->pn_len + cs->pn_off ||
2718                  cs->hdr_len <= cs->key_idx_off ||
2719                  cs->key_idx_shift > 7 ||
2720                  cs->key_idx_mask == 0);
2721 }
2722
2723 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2724 {
2725         int i;
2726
2727         /* Ensure we have enough iftype bitmap space for all iftype values */
2728         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2729
2730         for (i = 0; i < n; i++)
2731                 if (!ieee80211_cs_valid(&cs[i]))
2732                         return false;
2733
2734         return true;
2735 }
2736
2737 const struct ieee80211_cipher_scheme *
2738 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2739                  enum nl80211_iftype iftype)
2740 {
2741         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2742         int n = local->hw.n_cipher_schemes;
2743         int i;
2744         const struct ieee80211_cipher_scheme *cs = NULL;
2745
2746         for (i = 0; i < n; i++) {
2747                 if (l[i].cipher == cipher) {
2748                         cs = &l[i];
2749                         break;
2750                 }
2751         }
2752
2753         if (!cs || !(cs->iftype & BIT(iftype)))
2754                 return NULL;
2755
2756         return cs;
2757 }
2758
2759 int ieee80211_cs_headroom(struct ieee80211_local *local,
2760                           struct cfg80211_crypto_settings *crypto,
2761                           enum nl80211_iftype iftype)
2762 {
2763         const struct ieee80211_cipher_scheme *cs;
2764         int headroom = IEEE80211_ENCRYPT_HEADROOM;
2765         int i;
2766
2767         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
2768                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
2769                                       iftype);
2770
2771                 if (cs && headroom < cs->hdr_len)
2772                         headroom = cs->hdr_len;
2773         }
2774
2775         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
2776         if (cs && headroom < cs->hdr_len)
2777                 headroom = cs->hdr_len;
2778
2779         return headroom;
2780 }
2781
2782 static bool
2783 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
2784 {
2785         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
2786         int skip;
2787
2788         if (end > 0)
2789                 return false;
2790
2791         /* End time is in the past, check for repetitions */
2792         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
2793         if (data->count[i] < 255) {
2794                 if (data->count[i] <= skip) {
2795                         data->count[i] = 0;
2796                         return false;
2797                 }
2798
2799                 data->count[i] -= skip;
2800         }
2801
2802         data->desc[i].start += skip * data->desc[i].interval;
2803
2804         return true;
2805 }
2806
2807 static bool
2808 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
2809                              s32 *offset)
2810 {
2811         bool ret = false;
2812         int i;
2813
2814         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2815                 s32 cur;
2816
2817                 if (!data->count[i])
2818                         continue;
2819
2820                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
2821                         ret = true;
2822
2823                 cur = data->desc[i].start - tsf;
2824                 if (cur > *offset)
2825                         continue;
2826
2827                 cur = data->desc[i].start + data->desc[i].duration - tsf;
2828                 if (cur > *offset)
2829                         *offset = cur;
2830         }
2831
2832         return ret;
2833 }
2834
2835 static u32
2836 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
2837 {
2838         s32 offset = 0;
2839         int tries = 0;
2840         /*
2841          * arbitrary limit, used to avoid infinite loops when combined NoA
2842          * descriptors cover the full time period.
2843          */
2844         int max_tries = 5;
2845
2846         ieee80211_extend_absent_time(data, tsf, &offset);
2847         do {
2848                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
2849                         break;
2850
2851                 tries++;
2852         } while (tries < max_tries);
2853
2854         return offset;
2855 }
2856
2857 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
2858 {
2859         u32 next_offset = BIT(31) - 1;
2860         int i;
2861
2862         data->absent = 0;
2863         data->has_next_tsf = false;
2864         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2865                 s32 start;
2866
2867                 if (!data->count[i])
2868                         continue;
2869
2870                 ieee80211_extend_noa_desc(data, tsf, i);
2871                 start = data->desc[i].start - tsf;
2872                 if (start <= 0)
2873                         data->absent |= BIT(i);
2874
2875                 if (next_offset > start)
2876                         next_offset = start;
2877
2878                 data->has_next_tsf = true;
2879         }
2880
2881         if (data->absent)
2882                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
2883
2884         data->next_tsf = tsf + next_offset;
2885 }
2886 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
2887
2888 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
2889                             struct ieee80211_noa_data *data, u32 tsf)
2890 {
2891         int ret = 0;
2892         int i;
2893
2894         memset(data, 0, sizeof(*data));
2895
2896         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2897                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
2898
2899                 if (!desc->count || !desc->duration)
2900                         continue;
2901
2902                 data->count[i] = desc->count;
2903                 data->desc[i].start = le32_to_cpu(desc->start_time);
2904                 data->desc[i].duration = le32_to_cpu(desc->duration);
2905                 data->desc[i].interval = le32_to_cpu(desc->interval);
2906
2907                 if (data->count[i] > 1 &&
2908                     data->desc[i].interval < data->desc[i].duration)
2909                         continue;
2910
2911                 ieee80211_extend_noa_desc(data, tsf, i);
2912                 ret++;
2913         }
2914
2915         if (ret)
2916                 ieee80211_update_p2p_noa(data, tsf);
2917
2918         return ret;
2919 }
2920 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
2921
2922 void ieee80211_recalc_dtim(struct ieee80211_local *local,
2923                            struct ieee80211_sub_if_data *sdata)
2924 {
2925         u64 tsf = drv_get_tsf(local, sdata);
2926         u64 dtim_count = 0;
2927         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
2928         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
2929         struct ps_data *ps;
2930         u8 bcns_from_dtim;
2931
2932         if (tsf == -1ULL || !beacon_int || !dtim_period)
2933                 return;
2934
2935         if (sdata->vif.type == NL80211_IFTYPE_AP ||
2936             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
2937                 if (!sdata->bss)
2938                         return;
2939
2940                 ps = &sdata->bss->ps;
2941         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2942                 ps = &sdata->u.mesh.ps;
2943         } else {
2944                 return;
2945         }
2946
2947         /*
2948          * actually finds last dtim_count, mac80211 will update in
2949          * __beacon_add_tim().
2950          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
2951          */
2952         do_div(tsf, beacon_int);
2953         bcns_from_dtim = do_div(tsf, dtim_period);
2954         /* just had a DTIM */
2955         if (!bcns_from_dtim)
2956                 dtim_count = 0;
2957         else
2958                 dtim_count = dtim_period - bcns_from_dtim;
2959
2960         ps->dtim_count = dtim_count;
2961 }
2962
2963 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
2964                                          struct ieee80211_chanctx *ctx)
2965 {
2966         struct ieee80211_sub_if_data *sdata;
2967         u8 radar_detect = 0;
2968
2969         lockdep_assert_held(&local->chanctx_mtx);
2970
2971         if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
2972                 return 0;
2973
2974         list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
2975                 if (sdata->reserved_radar_required)
2976                         radar_detect |= BIT(sdata->reserved_chandef.width);
2977
2978         /*
2979          * An in-place reservation context should not have any assigned vifs
2980          * until it replaces the other context.
2981          */
2982         WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
2983                 !list_empty(&ctx->assigned_vifs));
2984
2985         list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
2986                 if (sdata->radar_required)
2987                         radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
2988
2989         return radar_detect;
2990 }
2991
2992 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
2993                                  const struct cfg80211_chan_def *chandef,
2994                                  enum ieee80211_chanctx_mode chanmode,
2995                                  u8 radar_detect)
2996 {
2997         struct ieee80211_local *local = sdata->local;
2998         struct ieee80211_sub_if_data *sdata_iter;
2999         enum nl80211_iftype iftype = sdata->wdev.iftype;
3000         int num[NUM_NL80211_IFTYPES];
3001         struct ieee80211_chanctx *ctx;
3002         int num_different_channels = 0;
3003         int total = 1;
3004
3005         lockdep_assert_held(&local->chanctx_mtx);
3006
3007         if (WARN_ON(hweight32(radar_detect) > 1))
3008                 return -EINVAL;
3009
3010         if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3011                     !chandef->chan))
3012                 return -EINVAL;
3013
3014         if (chandef)
3015                 num_different_channels = 1;
3016
3017         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
3018                 return -EINVAL;
3019
3020         /* Always allow software iftypes */
3021         if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
3022                 if (radar_detect)
3023                         return -EINVAL;
3024                 return 0;
3025         }
3026
3027         memset(num, 0, sizeof(num));
3028
3029         if (iftype != NL80211_IFTYPE_UNSPECIFIED)
3030                 num[iftype] = 1;
3031
3032         list_for_each_entry(ctx, &local->chanctx_list, list) {
3033                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3034                         continue;
3035                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3036                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
3037                         num_different_channels++;
3038                         continue;
3039                 }
3040                 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3041                     cfg80211_chandef_compatible(chandef,
3042                                                 &ctx->conf.def))
3043                         continue;
3044                 num_different_channels++;
3045         }
3046
3047         list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
3048                 struct wireless_dev *wdev_iter;
3049
3050                 wdev_iter = &sdata_iter->wdev;
3051
3052                 if (sdata_iter == sdata ||
3053                     rcu_access_pointer(sdata_iter->vif.chanctx_conf) == NULL ||
3054                     local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
3055                         continue;
3056
3057                 num[wdev_iter->iftype]++;
3058                 total++;
3059         }
3060
3061         if (total == 1 && !radar_detect)
3062                 return 0;
3063
3064         return cfg80211_check_combinations(local->hw.wiphy,
3065                                            num_different_channels,
3066                                            radar_detect, num);
3067 }
3068
3069 static void
3070 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
3071                          void *data)
3072 {
3073         u32 *max_num_different_channels = data;
3074
3075         *max_num_different_channels = max(*max_num_different_channels,
3076                                           c->num_different_channels);
3077 }
3078
3079 int ieee80211_max_num_channels(struct ieee80211_local *local)
3080 {
3081         struct ieee80211_sub_if_data *sdata;
3082         int num[NUM_NL80211_IFTYPES] = {};
3083         struct ieee80211_chanctx *ctx;
3084         int num_different_channels = 0;
3085         u8 radar_detect = 0;
3086         u32 max_num_different_channels = 1;
3087         int err;
3088
3089         lockdep_assert_held(&local->chanctx_mtx);
3090
3091         list_for_each_entry(ctx, &local->chanctx_list, list) {
3092                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3093                         continue;
3094
3095                 num_different_channels++;
3096
3097                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3098         }
3099
3100         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3101                 num[sdata->wdev.iftype]++;
3102
3103         err = cfg80211_iter_combinations(local->hw.wiphy,
3104                                          num_different_channels, radar_detect,
3105                                          num, ieee80211_iter_max_chans,
3106                                          &max_num_different_channels);
3107         if (err < 0)
3108                 return err;
3109
3110         return max_num_different_channels;
3111 }
3112
3113 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
3114 {
3115         *buf++ = WLAN_EID_VENDOR_SPECIFIC;
3116         *buf++ = 7; /* len */
3117         *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
3118         *buf++ = 0x50;
3119         *buf++ = 0xf2;
3120         *buf++ = 2; /* WME */
3121         *buf++ = 0; /* WME info */
3122         *buf++ = 1; /* WME ver */
3123         *buf++ = qosinfo; /* U-APSD no in use */
3124
3125         return buf;
3126 }