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  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * utilities for mac80211
  12  */
  13
  14 #include <net/mac80211.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/export.h>
  17 #include <linux/types.h>
  18 #include <linux/slab.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/crc32.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/rtnetlink.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wme.h"
  33 #include "led.h"
  34 #include "wep.h"
  35
  36 /* privid for wiphys to determine whether they belong to us or not */
  37 const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid;
  38
  39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  40 {
  41         struct ieee80211_local *local;
  42         BUG_ON(!wiphy);
  43
  44         local = wiphy_priv(wiphy);
  45         return &local->hw;
  46 }
  47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  48
  49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  50                         enum nl80211_iftype type)
  51 {
  52         __le16 fc = hdr->frame_control;
  53
  54          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  55         if (len < 16)
  56                 return NULL;
  57
  58         if (ieee80211_is_data(fc)) {
  59                 if (len < 24) /* drop incorrect hdr len (data) */
  60                         return NULL;
  61
  62                 if (ieee80211_has_a4(fc))
  63                         return NULL;
  64                 if (ieee80211_has_tods(fc))
  65                         return hdr->addr1;
  66                 if (ieee80211_has_fromds(fc))
  67                         return hdr->addr2;
  68
  69                 return hdr->addr3;
  70         }
  71
  72         if (ieee80211_is_mgmt(fc)) {
  73                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  74                         return NULL;
  75                 return hdr->addr3;
  76         }
  77
  78         if (ieee80211_is_ctl(fc)) {
  79                 if (ieee80211_is_pspoll(fc))
  80                         return hdr->addr1;
  81
  82                 if (ieee80211_is_back_req(fc)) {
  83                         switch (type) {
  84                         case NL80211_IFTYPE_STATION:
  85                                 return hdr->addr2;
  86                         case NL80211_IFTYPE_AP:
  87                         case NL80211_IFTYPE_AP_VLAN:
  88                                 return hdr->addr1;
  89                         default:
  90                                 break; /* fall through to the return */
  91                         }
  92                 }
  93         }
  94
  95         return NULL;
  96 }
  97
  98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  99 {
 100         struct sk_buff *skb;
 101         struct ieee80211_hdr *hdr;
 102
 103         skb_queue_walk(&tx->skbs, skb) {
 104                 hdr = (struct ieee80211_hdr *) skb->data;
 105                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 106         }
 107 }
 108
 109 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
 110                              int rate, int erp, int short_preamble,
 111                              int shift)
 112 {
 113         int dur;
 114
 115         /* calculate duration (in microseconds, rounded up to next higher
 116          * integer if it includes a fractional microsecond) to send frame of
 117          * len bytes (does not include FCS) at the given rate. Duration will
 118          * also include SIFS.
 119          *
 120          * rate is in 100 kbps, so divident is multiplied by 10 in the
 121          * DIV_ROUND_UP() operations.
 122          *
 123          * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
 124          * is assumed to be 0 otherwise.
 125          */
 126
 127         if (band == IEEE80211_BAND_5GHZ || erp) {
 128                 /*
 129                  * OFDM:
 130                  *
 131                  * N_DBPS = DATARATE x 4
 132                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 133                  *      (16 = SIGNAL time, 6 = tail bits)
 134                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 135                  *
 136                  * T_SYM = 4 usec
 137                  * 802.11a - 18.5.2: aSIFSTime = 16 usec
 138                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 139                  *      signal ext = 6 usec
 140                  */
 141                 dur = 16; /* SIFS + signal ext */
 142                 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
 143                 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
 144
 145                 /* IEEE 802.11-2012 18.3.2.4: all values above are:
 146                  *  * times 4 for 5 MHz
 147                  *  * times 2 for 10 MHz
 148                  */
 149                 dur *= 1 << shift;
 150
 151                 /* rates should already consider the channel bandwidth,
 152                  * don't apply divisor again.
 153                  */
 154                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 155                                         4 * rate); /* T_SYM x N_SYM */
 156         } else {
 157                 /*
 158                  * 802.11b or 802.11g with 802.11b compatibility:
 159                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 160                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 161                  *
 162                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 163                  * aSIFSTime = 10 usec
 164                  * aPreambleLength = 144 usec or 72 usec with short preamble
 165                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 166                  */
 167                 dur = 10; /* aSIFSTime = 10 usec */
 168                 dur += short_preamble ? (72 + 24) : (144 + 48);
 169
 170                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 171         }
 172
 173         return dur;
 174 }
 175
 176 /* Exported duration function for driver use */
 177 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 178                                         struct ieee80211_vif *vif,
 179                                         enum ieee80211_band band,
 180                                         size_t frame_len,
 181                                         struct ieee80211_rate *rate)
 182 {
 183         struct ieee80211_sub_if_data *sdata;
 184         u16 dur;
 185         int erp, shift = 0;
 186         bool short_preamble = false;
 187
 188         erp = 0;
 189         if (vif) {
 190                 sdata = vif_to_sdata(vif);
 191                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 192                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 193                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 194                 shift = ieee80211_vif_get_shift(vif);
 195         }
 196
 197         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 198                                        short_preamble, shift);
 199
 200         return cpu_to_le16(dur);
 201 }
 202 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 203
 204 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 205                               struct ieee80211_vif *vif, size_t frame_len,
 206                               const struct ieee80211_tx_info *frame_txctl)
 207 {
 208         struct ieee80211_local *local = hw_to_local(hw);
 209         struct ieee80211_rate *rate;
 210         struct ieee80211_sub_if_data *sdata;
 211         bool short_preamble;
 212         int erp, shift = 0, bitrate;
 213         u16 dur;
 214         struct ieee80211_supported_band *sband;
 215
 216         sband = local->hw.wiphy->bands[frame_txctl->band];
 217
 218         short_preamble = false;
 219
 220         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 221
 222         erp = 0;
 223         if (vif) {
 224                 sdata = vif_to_sdata(vif);
 225                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 226                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 227                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 228                 shift = ieee80211_vif_get_shift(vif);
 229         }
 230
 231         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 232
 233         /* CTS duration */
 234         dur = ieee80211_frame_duration(sband->band, 10, bitrate,
 235                                        erp, short_preamble, shift);
 236         /* Data frame duration */
 237         dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
 238                                         erp, short_preamble, shift);
 239         /* ACK duration */
 240         dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 241                                         erp, short_preamble, shift);
 242
 243         return cpu_to_le16(dur);
 244 }
 245 EXPORT_SYMBOL(ieee80211_rts_duration);
 246
 247 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 248                                     struct ieee80211_vif *vif,
 249                                     size_t frame_len,
 250                                     const struct ieee80211_tx_info *frame_txctl)
 251 {
 252         struct ieee80211_local *local = hw_to_local(hw);
 253         struct ieee80211_rate *rate;
 254         struct ieee80211_sub_if_data *sdata;
 255         bool short_preamble;
 256         int erp, shift = 0, bitrate;
 257         u16 dur;
 258         struct ieee80211_supported_band *sband;
 259
 260         sband = local->hw.wiphy->bands[frame_txctl->band];
 261
 262         short_preamble = false;
 263
 264         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 265         erp = 0;
 266         if (vif) {
 267                 sdata = vif_to_sdata(vif);
 268                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 269                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 270                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 271                 shift = ieee80211_vif_get_shift(vif);
 272         }
 273
 274         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 275
 276         /* Data frame duration */
 277         dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
 278                                        erp, short_preamble, shift);
 279         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 280                 /* ACK duration */
 281                 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 282                                                 erp, short_preamble, shift);
 283         }
 284
 285         return cpu_to_le16(dur);
 286 }
 287 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 288
 289 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 290 {
 291         struct ieee80211_sub_if_data *sdata;
 292         int n_acs = IEEE80211_NUM_ACS;
 293
 294         if (local->hw.queues < IEEE80211_NUM_ACS)
 295                 n_acs = 1;
 296
 297         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 298                 int ac;
 299
 300                 if (!sdata->dev)
 301                         continue;
 302
 303                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 304                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 305                         continue;
 306
 307                 for (ac = 0; ac < n_acs; ac++) {
 308                         int ac_queue = sdata->vif.hw_queue[ac];
 309
 310                         if (ac_queue == queue ||
 311                             (sdata->vif.cab_queue == queue &&
 312                              local->queue_stop_reasons[ac_queue] == 0 &&
 313                              skb_queue_empty(&local->pending[ac_queue])))
 314                                 netif_wake_subqueue(sdata->dev, ac);
 315                 }
 316         }
 317 }
 318
 319 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 320                                    enum queue_stop_reason reason)
 321 {
 322         struct ieee80211_local *local = hw_to_local(hw);
 323
 324         trace_wake_queue(local, queue, reason);
 325
 326         if (WARN_ON(queue >= hw->queues))
 327                 return;
 328
 329         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 330                 return;
 331
 332         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 333
 334         if (local->queue_stop_reasons[queue] != 0)
 335                 /* someone still has this queue stopped */
 336                 return;
 337
 338         if (skb_queue_empty(&local->pending[queue])) {
 339                 rcu_read_lock();
 340                 ieee80211_propagate_queue_wake(local, queue);
 341                 rcu_read_unlock();
 342         } else
 343                 tasklet_schedule(&local->tx_pending_tasklet);
 344 }
 345
 346 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 347                                     enum queue_stop_reason reason)
 348 {
 349         struct ieee80211_local *local = hw_to_local(hw);
 350         unsigned long flags;
 351
 352         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 353         __ieee80211_wake_queue(hw, queue, reason);
 354         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 355 }
 356
 357 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 358 {
 359         ieee80211_wake_queue_by_reason(hw, queue,
 360                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 361 }
 362 EXPORT_SYMBOL(ieee80211_wake_queue);
 363
 364 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 365                                    enum queue_stop_reason reason)
 366 {
 367         struct ieee80211_local *local = hw_to_local(hw);
 368         struct ieee80211_sub_if_data *sdata;
 369         int n_acs = IEEE80211_NUM_ACS;
 370
 371         trace_stop_queue(local, queue, reason);
 372
 373         if (WARN_ON(queue >= hw->queues))
 374                 return;
 375
 376         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 377                 return;
 378
 379         __set_bit(reason, &local->queue_stop_reasons[queue]);
 380
 381         if (local->hw.queues < IEEE80211_NUM_ACS)
 382                 n_acs = 1;
 383
 384         rcu_read_lock();
 385         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 386                 int ac;
 387
 388                 if (!sdata->dev)
 389                         continue;
 390
 391                 for (ac = 0; ac < n_acs; ac++) {
 392                         if (sdata->vif.hw_queue[ac] == queue ||
 393                             sdata->vif.cab_queue == queue)
 394                                 netif_stop_subqueue(sdata->dev, ac);
 395                 }
 396         }
 397         rcu_read_unlock();
 398 }
 399
 400 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 401                                     enum queue_stop_reason reason)
 402 {
 403         struct ieee80211_local *local = hw_to_local(hw);
 404         unsigned long flags;
 405
 406         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 407         __ieee80211_stop_queue(hw, queue, reason);
 408         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 409 }
 410
 411 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 412 {
 413         ieee80211_stop_queue_by_reason(hw, queue,
 414                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 415 }
 416 EXPORT_SYMBOL(ieee80211_stop_queue);
 417
 418 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 419                                struct sk_buff *skb)
 420 {
 421         struct ieee80211_hw *hw = &local->hw;
 422         unsigned long flags;
 423         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 424         int queue = info->hw_queue;
 425
 426         if (WARN_ON(!info->control.vif)) {
 427                 ieee80211_free_txskb(&local->hw, skb);
 428                 return;
 429         }
 430
 431         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 432         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 433         __skb_queue_tail(&local->pending[queue], skb);
 434         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 435         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 436 }
 437
 438 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 439                                 struct sk_buff_head *skbs)
 440 {
 441         struct ieee80211_hw *hw = &local->hw;
 442         struct sk_buff *skb;
 443         unsigned long flags;
 444         int queue, i;
 445
 446         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 447         while ((skb = skb_dequeue(skbs))) {
 448                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 449
 450                 if (WARN_ON(!info->control.vif)) {
 451                         ieee80211_free_txskb(&local->hw, skb);
 452                         continue;
 453                 }
 454
 455                 queue = info->hw_queue;
 456
 457                 __ieee80211_stop_queue(hw, queue,
 458                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 459
 460                 __skb_queue_tail(&local->pending[queue], skb);
 461         }
 462
 463         for (i = 0; i < hw->queues; i++)
 464                 __ieee80211_wake_queue(hw, i,
 465                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 466         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 467 }
 468
 469 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 470                                      unsigned long queues,
 471                                      enum queue_stop_reason reason)
 472 {
 473         struct ieee80211_local *local = hw_to_local(hw);
 474         unsigned long flags;
 475         int i;
 476
 477         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 478
 479         for_each_set_bit(i, &queues, hw->queues)
 480                 __ieee80211_stop_queue(hw, i, reason);
 481
 482         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 483 }
 484
 485 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 486 {
 487         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 488                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 489 }
 490 EXPORT_SYMBOL(ieee80211_stop_queues);
 491
 492 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 493 {
 494         struct ieee80211_local *local = hw_to_local(hw);
 495         unsigned long flags;
 496         int ret;
 497
 498         if (WARN_ON(queue >= hw->queues))
 499                 return true;
 500
 501         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 502         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 503                        &local->queue_stop_reasons[queue]);
 504         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 505         return ret;
 506 }
 507 EXPORT_SYMBOL(ieee80211_queue_stopped);
 508
 509 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 510                                      unsigned long queues,
 511                                      enum queue_stop_reason reason)
 512 {
 513         struct ieee80211_local *local = hw_to_local(hw);
 514         unsigned long flags;
 515         int i;
 516
 517         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 518
 519         for_each_set_bit(i, &queues, hw->queues)
 520                 __ieee80211_wake_queue(hw, i, reason);
 521
 522         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 523 }
 524
 525 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 526 {
 527         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 528                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 529 }
 530 EXPORT_SYMBOL(ieee80211_wake_queues);
 531
 532 void ieee80211_flush_queues(struct ieee80211_local *local,
 533                             struct ieee80211_sub_if_data *sdata)
 534 {
 535         u32 queues;
 536
 537         if (!local->ops->flush)
 538                 return;
 539
 540         if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
 541                 int ac;
 542
 543                 queues = 0;
 544
 545                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 546                         queues |= BIT(sdata->vif.hw_queue[ac]);
 547                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 548                         queues |= BIT(sdata->vif.cab_queue);
 549         } else {
 550                 /* all queues */
 551                 queues = BIT(local->hw.queues) - 1;
 552         }
 553
 554         ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 555                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 556
 557         drv_flush(local, sdata, queues, false);
 558
 559         ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 560                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 561 }
 562
 563 static void __iterate_active_interfaces(struct ieee80211_local *local,
 564                                         u32 iter_flags,
 565                                         void (*iterator)(void *data, u8 *mac,
 566                                                 struct ieee80211_vif *vif),
 567                                         void *data)
 568 {
 569         struct ieee80211_sub_if_data *sdata;
 570
 571         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 572                 switch (sdata->vif.type) {
 573                 case NL80211_IFTYPE_MONITOR:
 574                         if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 575                                 continue;
 576                         break;
 577                 case NL80211_IFTYPE_AP_VLAN:
 578                         continue;
 579                 default:
 580                         break;
 581                 }
 582                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 583                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 584                         continue;
 585                 if (ieee80211_sdata_running(sdata))
 586                         iterator(data, sdata->vif.addr,
 587                                  &sdata->vif);
 588         }
 589
 590         sdata = rcu_dereference_check(local->monitor_sdata,
 591                                       lockdep_is_held(&local->iflist_mtx) ||
 592                                       lockdep_rtnl_is_held());
 593         if (sdata &&
 594             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 595              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 596                 iterator(data, sdata->vif.addr, &sdata->vif);
 597 }
 598
 599 void ieee80211_iterate_active_interfaces(
 600         struct ieee80211_hw *hw, u32 iter_flags,
 601         void (*iterator)(void *data, u8 *mac,
 602                          struct ieee80211_vif *vif),
 603         void *data)
 604 {
 605         struct ieee80211_local *local = hw_to_local(hw);
 606
 607         mutex_lock(&local->iflist_mtx);
 608         __iterate_active_interfaces(local, iter_flags, iterator, data);
 609         mutex_unlock(&local->iflist_mtx);
 610 }
 611 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 612
 613 void ieee80211_iterate_active_interfaces_atomic(
 614         struct ieee80211_hw *hw, u32 iter_flags,
 615         void (*iterator)(void *data, u8 *mac,
 616                          struct ieee80211_vif *vif),
 617         void *data)
 618 {
 619         struct ieee80211_local *local = hw_to_local(hw);
 620
 621         rcu_read_lock();
 622         __iterate_active_interfaces(local, iter_flags, iterator, data);
 623         rcu_read_unlock();
 624 }
 625 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 626
 627 void ieee80211_iterate_active_interfaces_rtnl(
 628         struct ieee80211_hw *hw, u32 iter_flags,
 629         void (*iterator)(void *data, u8 *mac,
 630                          struct ieee80211_vif *vif),
 631         void *data)
 632 {
 633         struct ieee80211_local *local = hw_to_local(hw);
 634
 635         ASSERT_RTNL();
 636
 637         __iterate_active_interfaces(local, iter_flags, iterator, data);
 638 }
 639 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
 640
 641 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
 642 {
 643         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 644
 645         if (!ieee80211_sdata_running(sdata) ||
 646             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 647                 return NULL;
 648         return &sdata->vif;
 649 }
 650 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
 651
 652 /*
 653  * Nothing should have been stuffed into the workqueue during
 654  * the suspend->resume cycle. If this WARN is seen then there
 655  * is a bug with either the driver suspend or something in
 656  * mac80211 stuffing into the workqueue which we haven't yet
 657  * cleared during mac80211's suspend cycle.
 658  */
 659 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 660 {
 661         if (WARN(local->suspended && !local->resuming,
 662                  "queueing ieee80211 work while going to suspend\n"))
 663                 return false;
 664
 665         return true;
 666 }
 667
 668 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 669 {
 670         struct ieee80211_local *local = hw_to_local(hw);
 671
 672         if (!ieee80211_can_queue_work(local))
 673                 return;
 674
 675         queue_work(local->workqueue, work);
 676 }
 677 EXPORT_SYMBOL(ieee80211_queue_work);
 678
 679 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 680                                   struct delayed_work *dwork,
 681                                   unsigned long delay)
 682 {
 683         struct ieee80211_local *local = hw_to_local(hw);
 684
 685         if (!ieee80211_can_queue_work(local))
 686                 return;
 687
 688         queue_delayed_work(local->workqueue, dwork, delay);
 689 }
 690 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 691
 692 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 693                                struct ieee802_11_elems *elems,
 694                                u64 filter, u32 crc)
 695 {
 696         size_t left = len;
 697         const u8 *pos = start;
 698         bool calc_crc = filter != 0;
 699         DECLARE_BITMAP(seen_elems, 256);
 700         const u8 *ie;
 701
 702         bitmap_zero(seen_elems, 256);
 703         memset(elems, 0, sizeof(*elems));
 704         elems->ie_start = start;
 705         elems->total_len = len;
 706
 707         while (left >= 2) {
 708                 u8 id, elen;
 709                 bool elem_parse_failed;
 710
 711                 id = *pos++;
 712                 elen = *pos++;
 713                 left -= 2;
 714
 715                 if (elen > left) {
 716                         elems->parse_error = true;
 717                         break;
 718                 }
 719
 720                 switch (id) {
 721                 case WLAN_EID_SSID:
 722                 case WLAN_EID_SUPP_RATES:
 723                 case WLAN_EID_FH_PARAMS:
 724                 case WLAN_EID_DS_PARAMS:
 725                 case WLAN_EID_CF_PARAMS:
 726                 case WLAN_EID_TIM:
 727                 case WLAN_EID_IBSS_PARAMS:
 728                 case WLAN_EID_CHALLENGE:
 729                 case WLAN_EID_RSN:
 730                 case WLAN_EID_ERP_INFO:
 731                 case WLAN_EID_EXT_SUPP_RATES:
 732                 case WLAN_EID_HT_CAPABILITY:
 733                 case WLAN_EID_HT_OPERATION:
 734                 case WLAN_EID_VHT_CAPABILITY:
 735                 case WLAN_EID_VHT_OPERATION:
 736                 case WLAN_EID_MESH_ID:
 737                 case WLAN_EID_MESH_CONFIG:
 738                 case WLAN_EID_PEER_MGMT:
 739                 case WLAN_EID_PREQ:
 740                 case WLAN_EID_PREP:
 741                 case WLAN_EID_PERR:
 742                 case WLAN_EID_RANN:
 743                 case WLAN_EID_CHANNEL_SWITCH:
 744                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 745                 case WLAN_EID_COUNTRY:
 746                 case WLAN_EID_PWR_CONSTRAINT:
 747                 case WLAN_EID_TIMEOUT_INTERVAL:
 748                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 749                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 750                 case WLAN_EID_CHAN_SWITCH_PARAM:
 751                 /*
 752                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 753                  * that if the content gets bigger it might be needed more than once
 754                  */
 755                         if (test_bit(id, seen_elems)) {
 756                                 elems->parse_error = true;
 757                                 left -= elen;
 758                                 pos += elen;
 759                                 continue;
 760                         }
 761                         break;
 762                 }
 763
 764                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 765                         crc = crc32_be(crc, pos - 2, elen + 2);
 766
 767                 elem_parse_failed = false;
 768
 769                 switch (id) {
 770                 case WLAN_EID_SSID:
 771                         elems->ssid = pos;
 772                         elems->ssid_len = elen;
 773                         break;
 774                 case WLAN_EID_SUPP_RATES:
 775                         elems->supp_rates = pos;
 776                         elems->supp_rates_len = elen;
 777                         break;
 778                 case WLAN_EID_DS_PARAMS:
 779                         if (elen >= 1)
 780                                 elems->ds_params = pos;
 781                         else
 782                                 elem_parse_failed = true;
 783                         break;
 784                 case WLAN_EID_TIM:
 785                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 786                                 elems->tim = (void *)pos;
 787                                 elems->tim_len = elen;
 788                         } else
 789                                 elem_parse_failed = true;
 790                         break;
 791                 case WLAN_EID_CHALLENGE:
 792                         elems->challenge = pos;
 793                         elems->challenge_len = elen;
 794                         break;
 795                 case WLAN_EID_VENDOR_SPECIFIC:
 796                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 797                             pos[2] == 0xf2) {
 798                                 /* Microsoft OUI (00:50:F2) */
 799
 800                                 if (calc_crc)
 801                                         crc = crc32_be(crc, pos - 2, elen + 2);
 802
 803                                 if (elen >= 5 && pos[3] == 2) {
 804                                         /* OUI Type 2 - WMM IE */
 805                                         if (pos[4] == 0) {
 806                                                 elems->wmm_info = pos;
 807                                                 elems->wmm_info_len = elen;
 808                                         } else if (pos[4] == 1) {
 809                                                 elems->wmm_param = pos;
 810                                                 elems->wmm_param_len = elen;
 811                                         }
 812                                 }
 813                         }
 814                         break;
 815                 case WLAN_EID_RSN:
 816                         elems->rsn = pos;
 817                         elems->rsn_len = elen;
 818                         break;
 819                 case WLAN_EID_ERP_INFO:
 820                         if (elen >= 1)
 821                                 elems->erp_info = pos;
 822                         else
 823                                 elem_parse_failed = true;
 824                         break;
 825                 case WLAN_EID_EXT_SUPP_RATES:
 826                         elems->ext_supp_rates = pos;
 827                         elems->ext_supp_rates_len = elen;
 828                         break;
 829                 case WLAN_EID_HT_CAPABILITY:
 830                         if (elen >= sizeof(struct ieee80211_ht_cap))
 831                                 elems->ht_cap_elem = (void *)pos;
 832                         else
 833                                 elem_parse_failed = true;
 834                         break;
 835                 case WLAN_EID_HT_OPERATION:
 836                         if (elen >= sizeof(struct ieee80211_ht_operation))
 837                                 elems->ht_operation = (void *)pos;
 838                         else
 839                                 elem_parse_failed = true;
 840                         break;
 841                 case WLAN_EID_VHT_CAPABILITY:
 842                         if (elen >= sizeof(struct ieee80211_vht_cap))
 843                                 elems->vht_cap_elem = (void *)pos;
 844                         else
 845                                 elem_parse_failed = true;
 846                         break;
 847                 case WLAN_EID_VHT_OPERATION:
 848                         if (elen >= sizeof(struct ieee80211_vht_operation))
 849                                 elems->vht_operation = (void *)pos;
 850                         else
 851                                 elem_parse_failed = true;
 852                         break;
 853                 case WLAN_EID_OPMODE_NOTIF:
 854                         if (elen > 0)
 855                                 elems->opmode_notif = pos;
 856                         else
 857                                 elem_parse_failed = true;
 858                         break;
 859                 case WLAN_EID_MESH_ID:
 860                         elems->mesh_id = pos;
 861                         elems->mesh_id_len = elen;
 862                         break;
 863                 case WLAN_EID_MESH_CONFIG:
 864                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 865                                 elems->mesh_config = (void *)pos;
 866                         else
 867                                 elem_parse_failed = true;
 868                         break;
 869                 case WLAN_EID_PEER_MGMT:
 870                         elems->peering = pos;
 871                         elems->peering_len = elen;
 872                         break;
 873                 case WLAN_EID_MESH_AWAKE_WINDOW:
 874                         if (elen >= 2)
 875                                 elems->awake_window = (void *)pos;
 876                         break;
 877                 case WLAN_EID_PREQ:
 878                         elems->preq = pos;
 879                         elems->preq_len = elen;
 880                         break;
 881                 case WLAN_EID_PREP:
 882                         elems->prep = pos;
 883                         elems->prep_len = elen;
 884                         break;
 885                 case WLAN_EID_PERR:
 886                         elems->perr = pos;
 887                         elems->perr_len = elen;
 888                         break;
 889                 case WLAN_EID_RANN:
 890                         if (elen >= sizeof(struct ieee80211_rann_ie))
 891                                 elems->rann = (void *)pos;
 892                         else
 893                                 elem_parse_failed = true;
 894                         break;
 895                 case WLAN_EID_CHANNEL_SWITCH:
 896                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 897                                 elem_parse_failed = true;
 898                                 break;
 899                         }
 900                         elems->ch_switch_ie = (void *)pos;
 901                         break;
 902                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 903                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
 904                                 elem_parse_failed = true;
 905                                 break;
 906                         }
 907                         elems->ext_chansw_ie = (void *)pos;
 908                         break;
 909                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 910                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
 911                                 elem_parse_failed = true;
 912                                 break;
 913                         }
 914                         elems->sec_chan_offs = (void *)pos;
 915                         break;
 916                 case WLAN_EID_CHAN_SWITCH_PARAM:
 917                         if (elen !=
 918                             sizeof(*elems->mesh_chansw_params_ie)) {
 919                                 elem_parse_failed = true;
 920                                 break;
 921                         }
 922                         elems->mesh_chansw_params_ie = (void *)pos;
 923                         break;
 924                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 925                         if (!action ||
 926                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
 927                                 elem_parse_failed = true;
 928                                 break;
 929                         }
 930                         elems->wide_bw_chansw_ie = (void *)pos;
 931                         break;
 932                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
 933                         if (action) {
 934                                 elem_parse_failed = true;
 935                                 break;
 936                         }
 937                         /*
 938                          * This is a bit tricky, but as we only care about
 939                          * the wide bandwidth channel switch element, so
 940                          * just parse it out manually.
 941                          */
 942                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
 943                                               pos, elen);
 944                         if (ie) {
 945                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
 946                                         elems->wide_bw_chansw_ie =
 947                                                 (void *)(ie + 2);
 948                                 else
 949                                         elem_parse_failed = true;
 950                         }
 951                         break;
 952                 case WLAN_EID_COUNTRY:
 953                         elems->country_elem = pos;
 954                         elems->country_elem_len = elen;
 955                         break;
 956                 case WLAN_EID_PWR_CONSTRAINT:
 957                         if (elen != 1) {
 958                                 elem_parse_failed = true;
 959                                 break;
 960                         }
 961                         elems->pwr_constr_elem = pos;
 962                         break;
 963                 case WLAN_EID_TIMEOUT_INTERVAL:
 964                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
 965                                 elems->timeout_int = (void *)pos;
 966                         else
 967                                 elem_parse_failed = true;
 968                         break;
 969                 default:
 970                         break;
 971                 }
 972
 973                 if (elem_parse_failed)
 974                         elems->parse_error = true;
 975                 else
 976                         __set_bit(id, seen_elems);
 977
 978                 left -= elen;
 979                 pos += elen;
 980         }
 981
 982         if (left != 0)
 983                 elems->parse_error = true;
 984
 985         return crc;
 986 }
 987
 988 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 989                                bool bss_notify)
 990 {
 991         struct ieee80211_local *local = sdata->local;
 992         struct ieee80211_tx_queue_params qparam;
 993         struct ieee80211_chanctx_conf *chanctx_conf;
 994         int ac;
 995         bool use_11b, enable_qos;
 996         int aCWmin, aCWmax;
 997
 998         if (!local->ops->conf_tx)
 999                 return;
1000
1001         if (local->hw.queues < IEEE80211_NUM_ACS)
1002                 return;
1003
1004         memset(&qparam, 0, sizeof(qparam));
1005
1006         rcu_read_lock();
1007         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1008         use_11b = (chanctx_conf &&
1009                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1010                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1011         rcu_read_unlock();
1012
1013         /*
1014          * By default disable QoS in STA mode for old access points, which do
1015          * not support 802.11e. New APs will provide proper queue parameters,
1016          * that we will configure later.
1017          */
1018         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
1019
1020         /* Set defaults according to 802.11-2007 Table 7-37 */
1021         aCWmax = 1023;
1022         if (use_11b)
1023                 aCWmin = 31;
1024         else
1025                 aCWmin = 15;
1026
1027         /* Confiure old 802.11b/g medium access rules. */
1028         qparam.cw_max = aCWmax;
1029         qparam.cw_min = aCWmin;
1030         qparam.txop = 0;
1031         qparam.aifs = 2;
1032
1033         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1034                 /* Update if QoS is enabled. */
1035                 if (enable_qos) {
1036                         switch (ac) {
1037                         case IEEE80211_AC_BK:
1038                                 qparam.cw_max = aCWmax;
1039                                 qparam.cw_min = aCWmin;
1040                                 qparam.txop = 0;
1041                                 qparam.aifs = 7;
1042                                 break;
1043                         /* never happens but let's not leave undefined */
1044                         default:
1045                         case IEEE80211_AC_BE:
1046                                 qparam.cw_max = aCWmax;
1047                                 qparam.cw_min = aCWmin;
1048                                 qparam.txop = 0;
1049                                 qparam.aifs = 3;
1050                                 break;
1051                         case IEEE80211_AC_VI:
1052                                 qparam.cw_max = aCWmin;
1053                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1054                                 if (use_11b)
1055                                         qparam.txop = 6016/32;
1056                                 else
1057                                         qparam.txop = 3008/32;
1058                                 qparam.aifs = 2;
1059                                 break;
1060                         case IEEE80211_AC_VO:
1061                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1062                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1063                                 if (use_11b)
1064                                         qparam.txop = 3264/32;
1065                                 else
1066                                         qparam.txop = 1504/32;
1067                                 qparam.aifs = 2;
1068                                 break;
1069                         }
1070                 }
1071
1072                 qparam.uapsd = false;
1073
1074                 sdata->tx_conf[ac] = qparam;
1075                 drv_conf_tx(local, sdata, ac, &qparam);
1076         }
1077
1078         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1079             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1080                 sdata->vif.bss_conf.qos = enable_qos;
1081                 if (bss_notify)
1082                         ieee80211_bss_info_change_notify(sdata,
1083                                                          BSS_CHANGED_QOS);
1084         }
1085 }
1086
1087 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1088                          u16 transaction, u16 auth_alg, u16 status,
1089                          const u8 *extra, size_t extra_len, const u8 *da,
1090                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1091                          u32 tx_flags)
1092 {
1093         struct ieee80211_local *local = sdata->local;
1094         struct sk_buff *skb;
1095         struct ieee80211_mgmt *mgmt;
1096         int err;
1097
1098         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1099         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24 + 6 + extra_len);
1100         if (!skb)
1101                 return;
1102
1103         skb_reserve(skb, local->hw.extra_tx_headroom);
1104
1105         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1106         memset(mgmt, 0, 24 + 6);
1107         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1108                                           IEEE80211_STYPE_AUTH);
1109         memcpy(mgmt->da, da, ETH_ALEN);
1110         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1111         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1112         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1113         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1114         mgmt->u.auth.status_code = cpu_to_le16(status);
1115         if (extra)
1116                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1117
1118         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1119                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1120                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1121                 WARN_ON(err);
1122         }
1123
1124         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1125                                         tx_flags;
1126         ieee80211_tx_skb(sdata, skb);
1127 }
1128
1129 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1130                                     const u8 *bssid, u16 stype, u16 reason,
1131                                     bool send_frame, u8 *frame_buf)
1132 {
1133         struct ieee80211_local *local = sdata->local;
1134         struct sk_buff *skb;
1135         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1136
1137         /* build frame */
1138         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1139         mgmt->duration = 0; /* initialize only */
1140         mgmt->seq_ctrl = 0; /* initialize only */
1141         memcpy(mgmt->da, bssid, ETH_ALEN);
1142         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1143         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1144         /* u.deauth.reason_code == u.disassoc.reason_code */
1145         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1146
1147         if (send_frame) {
1148                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1149                                     IEEE80211_DEAUTH_FRAME_LEN);
1150                 if (!skb)
1151                         return;
1152
1153                 skb_reserve(skb, local->hw.extra_tx_headroom);
1154
1155                 /* copy in frame */
1156                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1157                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1158
1159                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1160                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1161                         IEEE80211_SKB_CB(skb)->flags |=
1162                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1163
1164                 ieee80211_tx_skb(sdata, skb);
1165         }
1166 }
1167
1168 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1169                              size_t buffer_len, const u8 *ie, size_t ie_len,
1170                              enum ieee80211_band band, u32 rate_mask,
1171                              struct cfg80211_chan_def *chandef)
1172 {
1173         struct ieee80211_supported_band *sband;
1174         u8 *pos = buffer, *end = buffer + buffer_len;
1175         size_t offset = 0, noffset;
1176         int supp_rates_len, i;
1177         u8 rates[32];
1178         int num_rates;
1179         int ext_rates_len;
1180         int shift;
1181         u32 rate_flags;
1182
1183         sband = local->hw.wiphy->bands[band];
1184         if (WARN_ON_ONCE(!sband))
1185                 return 0;
1186
1187         rate_flags = ieee80211_chandef_rate_flags(chandef);
1188         shift = ieee80211_chandef_get_shift(chandef);
1189
1190         num_rates = 0;
1191         for (i = 0; i < sband->n_bitrates; i++) {
1192                 if ((BIT(i) & rate_mask) == 0)
1193                         continue; /* skip rate */
1194                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1195                         continue;
1196
1197                 rates[num_rates++] =
1198                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1199                                           (1 << shift) * 5);
1200         }
1201
1202         supp_rates_len = min_t(int, num_rates, 8);
1203
1204         if (end - pos < 2 + supp_rates_len)
1205                 goto out_err;
1206         *pos++ = WLAN_EID_SUPP_RATES;
1207         *pos++ = supp_rates_len;
1208         memcpy(pos, rates, supp_rates_len);
1209         pos += supp_rates_len;
1210
1211         /* insert "request information" if in custom IEs */
1212         if (ie && ie_len) {
1213                 static const u8 before_extrates[] = {
1214                         WLAN_EID_SSID,
1215                         WLAN_EID_SUPP_RATES,
1216                         WLAN_EID_REQUEST,
1217                 };
1218                 noffset = ieee80211_ie_split(ie, ie_len,
1219                                              before_extrates,
1220                                              ARRAY_SIZE(before_extrates),
1221                                              offset);
1222                 if (end - pos < noffset - offset)
1223                         goto out_err;
1224                 memcpy(pos, ie + offset, noffset - offset);
1225                 pos += noffset - offset;
1226                 offset = noffset;
1227         }
1228
1229         ext_rates_len = num_rates - supp_rates_len;
1230         if (ext_rates_len > 0) {
1231                 if (end - pos < 2 + ext_rates_len)
1232                         goto out_err;
1233                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1234                 *pos++ = ext_rates_len;
1235                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1236                 pos += ext_rates_len;
1237         }
1238
1239         if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1240                 if (end - pos < 3)
1241                         goto out_err;
1242                 *pos++ = WLAN_EID_DS_PARAMS;
1243                 *pos++ = 1;
1244                 *pos++ = ieee80211_frequency_to_channel(
1245                                 chandef->chan->center_freq);
1246         }
1247
1248         /* insert custom IEs that go before HT */
1249         if (ie && ie_len) {
1250                 static const u8 before_ht[] = {
1251                         WLAN_EID_SSID,
1252                         WLAN_EID_SUPP_RATES,
1253                         WLAN_EID_REQUEST,
1254                         WLAN_EID_EXT_SUPP_RATES,
1255                         WLAN_EID_DS_PARAMS,
1256                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1257                 };
1258                 noffset = ieee80211_ie_split(ie, ie_len,
1259                                              before_ht, ARRAY_SIZE(before_ht),
1260                                              offset);
1261                 if (end - pos < noffset - offset)
1262                         goto out_err;
1263                 memcpy(pos, ie + offset, noffset - offset);
1264                 pos += noffset - offset;
1265                 offset = noffset;
1266         }
1267
1268         if (sband->ht_cap.ht_supported) {
1269                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1270                         goto out_err;
1271                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1272                                                 sband->ht_cap.cap);
1273         }
1274
1275         /*
1276          * If adding more here, adjust code in main.c
1277          * that calculates local->scan_ies_len.
1278          */
1279
1280         /* insert custom IEs that go before VHT */
1281         if (ie && ie_len) {
1282                 static const u8 before_vht[] = {
1283                         WLAN_EID_SSID,
1284                         WLAN_EID_SUPP_RATES,
1285                         WLAN_EID_REQUEST,
1286                         WLAN_EID_EXT_SUPP_RATES,
1287                         WLAN_EID_DS_PARAMS,
1288                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1289                         WLAN_EID_HT_CAPABILITY,
1290                         WLAN_EID_BSS_COEX_2040,
1291                         WLAN_EID_EXT_CAPABILITY,
1292                         WLAN_EID_SSID_LIST,
1293                         WLAN_EID_CHANNEL_USAGE,
1294                         WLAN_EID_INTERWORKING,
1295                         /* mesh ID can't happen here */
1296                         /* 60 GHz can't happen here right now */
1297                 };
1298                 noffset = ieee80211_ie_split(ie, ie_len,
1299                                              before_vht, ARRAY_SIZE(before_vht),
1300                                              offset);
1301                 if (end - pos < noffset - offset)
1302                         goto out_err;
1303                 memcpy(pos, ie + offset, noffset - offset);
1304                 pos += noffset - offset;
1305                 offset = noffset;
1306         }
1307
1308         if (sband->vht_cap.vht_supported) {
1309                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1310                         goto out_err;
1311                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1312                                                  sband->vht_cap.cap);
1313         }
1314
1315         /* add any remaining custom IEs */
1316         if (ie && ie_len) {
1317                 noffset = ie_len;
1318                 if (end - pos < noffset - offset)
1319                         goto out_err;
1320                 memcpy(pos, ie + offset, noffset - offset);
1321                 pos += noffset - offset;
1322         }
1323
1324         return pos - buffer;
1325  out_err:
1326         WARN_ONCE(1, "not enough space for preq IEs\n");
1327         return pos - buffer;
1328 }
1329
1330 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1331                                           u8 *dst, u32 ratemask,
1332                                           struct ieee80211_channel *chan,
1333                                           const u8 *ssid, size_t ssid_len,
1334                                           const u8 *ie, size_t ie_len,
1335                                           bool directed)
1336 {
1337         struct ieee80211_local *local = sdata->local;
1338         struct cfg80211_chan_def chandef;
1339         struct sk_buff *skb;
1340         struct ieee80211_mgmt *mgmt;
1341         int ies_len;
1342
1343         /*
1344          * Do not send DS Channel parameter for directed probe requests
1345          * in order to maximize the chance that we get a response.  Some
1346          * badly-behaved APs don't respond when this parameter is included.
1347          */
1348         chandef.width = sdata->vif.bss_conf.chandef.width;
1349         if (directed)
1350                 chandef.chan = NULL;
1351         else
1352                 chandef.chan = chan;
1353
1354         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1355                                      ssid, ssid_len, 100 + ie_len);
1356         if (!skb)
1357                 return NULL;
1358
1359         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1360                                            skb_tailroom(skb),
1361                                            ie, ie_len, chan->band,
1362                                            ratemask, &chandef);
1363         skb_put(skb, ies_len);
1364
1365         if (dst) {
1366                 mgmt = (struct ieee80211_mgmt *) skb->data;
1367                 memcpy(mgmt->da, dst, ETH_ALEN);
1368                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1369         }
1370
1371         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1372
1373         return skb;
1374 }
1375
1376 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1377                               const u8 *ssid, size_t ssid_len,
1378                               const u8 *ie, size_t ie_len,
1379                               u32 ratemask, bool directed, u32 tx_flags,
1380                               struct ieee80211_channel *channel, bool scan)
1381 {
1382         struct sk_buff *skb;
1383
1384         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1385                                         ssid, ssid_len,
1386                                         ie, ie_len, directed);
1387         if (skb) {
1388                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1389                 if (scan)
1390                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1391                 else
1392                         ieee80211_tx_skb(sdata, skb);
1393         }
1394 }
1395
1396 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1397                             struct ieee802_11_elems *elems,
1398                             enum ieee80211_band band, u32 *basic_rates)
1399 {
1400         struct ieee80211_supported_band *sband;
1401         size_t num_rates;
1402         u32 supp_rates, rate_flags;
1403         int i, j, shift;
1404         sband = sdata->local->hw.wiphy->bands[band];
1405
1406         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1407         shift = ieee80211_vif_get_shift(&sdata->vif);
1408
1409         if (WARN_ON(!sband))
1410                 return 1;
1411
1412         num_rates = sband->n_bitrates;
1413         supp_rates = 0;
1414         for (i = 0; i < elems->supp_rates_len +
1415                      elems->ext_supp_rates_len; i++) {
1416                 u8 rate = 0;
1417                 int own_rate;
1418                 bool is_basic;
1419                 if (i < elems->supp_rates_len)
1420                         rate = elems->supp_rates[i];
1421                 else if (elems->ext_supp_rates)
1422                         rate = elems->ext_supp_rates
1423                                 [i - elems->supp_rates_len];
1424                 own_rate = 5 * (rate & 0x7f);
1425                 is_basic = !!(rate & 0x80);
1426
1427                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1428                         continue;
1429
1430                 for (j = 0; j < num_rates; j++) {
1431                         int brate;
1432                         if ((rate_flags & sband->bitrates[j].flags)
1433                             != rate_flags)
1434                                 continue;
1435
1436                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1437                                              1 << shift);
1438
1439                         if (brate == own_rate) {
1440                                 supp_rates |= BIT(j);
1441                                 if (basic_rates && is_basic)
1442                                         *basic_rates |= BIT(j);
1443                         }
1444                 }
1445         }
1446         return supp_rates;
1447 }
1448
1449 void ieee80211_stop_device(struct ieee80211_local *local)
1450 {
1451         ieee80211_led_radio(local, false);
1452         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1453
1454         cancel_work_sync(&local->reconfig_filter);
1455
1456         flush_workqueue(local->workqueue);
1457         drv_stop(local);
1458 }
1459
1460 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1461 {
1462         struct ieee80211_sub_if_data *sdata;
1463         struct ieee80211_chanctx *ctx;
1464
1465         /*
1466          * We get here if during resume the device can't be restarted properly.
1467          * We might also get here if this happens during HW reset, which is a
1468          * slightly different situation and we need to drop all connections in
1469          * the latter case.
1470          *
1471          * Ask cfg80211 to turn off all interfaces, this will result in more
1472          * warnings but at least we'll then get into a clean stopped state.
1473          */
1474
1475         local->resuming = false;
1476         local->suspended = false;
1477         local->started = false;
1478
1479         /* scheduled scan clearly can't be running any more, but tell
1480          * cfg80211 and clear local state
1481          */
1482         ieee80211_sched_scan_end(local);
1483
1484         list_for_each_entry(sdata, &local->interfaces, list)
1485                 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1486
1487         /* Mark channel contexts as not being in the driver any more to avoid
1488          * removing them from the driver during the shutdown process...
1489          */
1490         mutex_lock(&local->chanctx_mtx);
1491         list_for_each_entry(ctx, &local->chanctx_list, list)
1492                 ctx->driver_present = false;
1493         mutex_unlock(&local->chanctx_mtx);
1494
1495         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1496 }
1497
1498 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1499                                      struct ieee80211_sub_if_data *sdata)
1500 {
1501         struct ieee80211_chanctx_conf *conf;
1502         struct ieee80211_chanctx *ctx;
1503
1504         if (!local->use_chanctx)
1505                 return;
1506
1507         mutex_lock(&local->chanctx_mtx);
1508         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1509                                          lockdep_is_held(&local->chanctx_mtx));
1510         if (conf) {
1511                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1512                 drv_assign_vif_chanctx(local, sdata, ctx);
1513         }
1514         mutex_unlock(&local->chanctx_mtx);
1515 }
1516
1517 int ieee80211_reconfig(struct ieee80211_local *local)
1518 {
1519         struct ieee80211_hw *hw = &local->hw;
1520         struct ieee80211_sub_if_data *sdata;
1521         struct ieee80211_chanctx *ctx;
1522         struct sta_info *sta;
1523         int res, i;
1524         bool reconfig_due_to_wowlan = false;
1525         struct ieee80211_sub_if_data *sched_scan_sdata;
1526         bool sched_scan_stopped = false;
1527
1528 #ifdef CONFIG_PM
1529         if (local->suspended)
1530                 local->resuming = true;
1531
1532         if (local->wowlan) {
1533                 res = drv_resume(local);
1534                 local->wowlan = false;
1535                 if (res < 0) {
1536                         local->resuming = false;
1537                         return res;
1538                 }
1539                 if (res == 0)
1540                         goto wake_up;
1541                 WARN_ON(res > 1);
1542                 /*
1543                  * res is 1, which means the driver requested
1544                  * to go through a regular reset on wakeup.
1545                  */
1546                 reconfig_due_to_wowlan = true;
1547         }
1548 #endif
1549         /* everything else happens only if HW was up & running */
1550         if (!local->open_count)
1551                 goto wake_up;
1552
1553         /*
1554          * Upon resume hardware can sometimes be goofy due to
1555          * various platform / driver / bus issues, so restarting
1556          * the device may at times not work immediately. Propagate
1557          * the error.
1558          */
1559         res = drv_start(local);
1560         if (res) {
1561                 if (local->suspended)
1562                         WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1563                 else
1564                         WARN(1, "Hardware became unavailable during restart.\n");
1565                 ieee80211_handle_reconfig_failure(local);
1566                 return res;
1567         }
1568
1569         /* setup fragmentation threshold */
1570         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1571
1572         /* setup RTS threshold */
1573         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1574
1575         /* reset coverage class */
1576         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1577
1578         ieee80211_led_radio(local, true);
1579         ieee80211_mod_tpt_led_trig(local,
1580                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1581
1582         /* add interfaces */
1583         sdata = rtnl_dereference(local->monitor_sdata);
1584         if (sdata) {
1585                 /* in HW restart it exists already */
1586                 WARN_ON(local->resuming);
1587                 res = drv_add_interface(local, sdata);
1588                 if (WARN_ON(res)) {
1589                         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1590                         synchronize_net();
1591                         kfree(sdata);
1592                 }
1593         }
1594
1595         list_for_each_entry(sdata, &local->interfaces, list) {
1596                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1597                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1598                     ieee80211_sdata_running(sdata))
1599                         res = drv_add_interface(local, sdata);
1600         }
1601
1602         /* add channel contexts */
1603         if (local->use_chanctx) {
1604                 mutex_lock(&local->chanctx_mtx);
1605                 list_for_each_entry(ctx, &local->chanctx_list, list)
1606                         WARN_ON(drv_add_chanctx(local, ctx));
1607                 mutex_unlock(&local->chanctx_mtx);
1608
1609                 list_for_each_entry(sdata, &local->interfaces, list) {
1610                         if (!ieee80211_sdata_running(sdata))
1611                                 continue;
1612                         ieee80211_assign_chanctx(local, sdata);
1613                 }
1614
1615                 sdata = rtnl_dereference(local->monitor_sdata);
1616                 if (sdata && ieee80211_sdata_running(sdata))
1617                         ieee80211_assign_chanctx(local, sdata);
1618         }
1619
1620         /* add STAs back */
1621         mutex_lock(&local->sta_mtx);
1622         list_for_each_entry(sta, &local->sta_list, list) {
1623                 enum ieee80211_sta_state state;
1624
1625                 if (!sta->uploaded)
1626                         continue;
1627
1628                 /* AP-mode stations will be added later */
1629                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1630                         continue;
1631
1632                 for (state = IEEE80211_STA_NOTEXIST;
1633                      state < sta->sta_state; state++)
1634                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1635                                               state + 1));
1636         }
1637         mutex_unlock(&local->sta_mtx);
1638
1639         /* reconfigure tx conf */
1640         if (hw->queues >= IEEE80211_NUM_ACS) {
1641                 list_for_each_entry(sdata, &local->interfaces, list) {
1642                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1643                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1644                             !ieee80211_sdata_running(sdata))
1645                                 continue;
1646
1647                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1648                                 drv_conf_tx(local, sdata, i,
1649                                             &sdata->tx_conf[i]);
1650                 }
1651         }
1652
1653         /* reconfigure hardware */
1654         ieee80211_hw_config(local, ~0);
1655
1656         ieee80211_configure_filter(local);
1657
1658         /* Finally also reconfigure all the BSS information */
1659         list_for_each_entry(sdata, &local->interfaces, list) {
1660                 u32 changed;
1661
1662                 if (!ieee80211_sdata_running(sdata))
1663                         continue;
1664
1665                 /* common change flags for all interface types */
1666                 changed = BSS_CHANGED_ERP_CTS_PROT |
1667                           BSS_CHANGED_ERP_PREAMBLE |
1668                           BSS_CHANGED_ERP_SLOT |
1669                           BSS_CHANGED_HT |
1670                           BSS_CHANGED_BASIC_RATES |
1671                           BSS_CHANGED_BEACON_INT |
1672                           BSS_CHANGED_BSSID |
1673                           BSS_CHANGED_CQM |
1674                           BSS_CHANGED_QOS |
1675                           BSS_CHANGED_IDLE |
1676                           BSS_CHANGED_TXPOWER;
1677
1678                 switch (sdata->vif.type) {
1679                 case NL80211_IFTYPE_STATION:
1680                         changed |= BSS_CHANGED_ASSOC |
1681                                    BSS_CHANGED_ARP_FILTER |
1682                                    BSS_CHANGED_PS;
1683
1684                         /* Re-send beacon info report to the driver */
1685                         if (sdata->u.mgd.have_beacon)
1686                                 changed |= BSS_CHANGED_BEACON_INFO;
1687
1688                         sdata_lock(sdata);
1689                         ieee80211_bss_info_change_notify(sdata, changed);
1690                         sdata_unlock(sdata);
1691                         break;
1692                 case NL80211_IFTYPE_ADHOC:
1693                         changed |= BSS_CHANGED_IBSS;
1694                         /* fall through */
1695                 case NL80211_IFTYPE_AP:
1696                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1697
1698                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1699                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1700
1701                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1702                                         drv_start_ap(local, sdata);
1703                         }
1704
1705                         /* fall through */
1706                 case NL80211_IFTYPE_MESH_POINT:
1707                         if (sdata->vif.bss_conf.enable_beacon) {
1708                                 changed |= BSS_CHANGED_BEACON |
1709                                            BSS_CHANGED_BEACON_ENABLED;
1710                                 ieee80211_bss_info_change_notify(sdata, changed);
1711                         }
1712                         break;
1713                 case NL80211_IFTYPE_WDS:
1714                 case NL80211_IFTYPE_AP_VLAN:
1715                 case NL80211_IFTYPE_MONITOR:
1716                 case NL80211_IFTYPE_P2P_DEVICE:
1717                         /* nothing to do */
1718                         break;
1719                 case NL80211_IFTYPE_UNSPECIFIED:
1720                 case NUM_NL80211_IFTYPES:
1721                 case NL80211_IFTYPE_P2P_CLIENT:
1722                 case NL80211_IFTYPE_P2P_GO:
1723                         WARN_ON(1);
1724                         break;
1725                 }
1726         }
1727
1728         ieee80211_recalc_ps(local, -1);
1729
1730         /*
1731          * The sta might be in psm against the ap (e.g. because
1732          * this was the state before a hw restart), so we
1733          * explicitly send a null packet in order to make sure
1734          * it'll sync against the ap (and get out of psm).
1735          */
1736         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1737                 list_for_each_entry(sdata, &local->interfaces, list) {
1738                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1739                                 continue;
1740                         if (!sdata->u.mgd.associated)
1741                                 continue;
1742
1743                         ieee80211_send_nullfunc(local, sdata, 0);
1744                 }
1745         }
1746
1747         /* APs are now beaconing, add back stations */
1748         mutex_lock(&local->sta_mtx);
1749         list_for_each_entry(sta, &local->sta_list, list) {
1750                 enum ieee80211_sta_state state;
1751
1752                 if (!sta->uploaded)
1753                         continue;
1754
1755                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1756                         continue;
1757
1758                 for (state = IEEE80211_STA_NOTEXIST;
1759                      state < sta->sta_state; state++)
1760                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1761                                               state + 1));
1762         }
1763         mutex_unlock(&local->sta_mtx);
1764
1765         /* add back keys */
1766         list_for_each_entry(sdata, &local->interfaces, list)
1767                 if (ieee80211_sdata_running(sdata))
1768                         ieee80211_enable_keys(sdata);
1769
1770  wake_up:
1771         local->in_reconfig = false;
1772         barrier();
1773
1774         if (local->monitors == local->open_count && local->monitors > 0)
1775                 ieee80211_add_virtual_monitor(local);
1776
1777         /*
1778          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1779          * sessions can be established after a resume.
1780          *
1781          * Also tear down aggregation sessions since reconfiguring
1782          * them in a hardware restart scenario is not easily done
1783          * right now, and the hardware will have lost information
1784          * about the sessions, but we and the AP still think they
1785          * are active. This is really a workaround though.
1786          */
1787         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1788                 mutex_lock(&local->sta_mtx);
1789
1790                 list_for_each_entry(sta, &local->sta_list, list) {
1791                         ieee80211_sta_tear_down_BA_sessions(
1792                                         sta, AGG_STOP_LOCAL_REQUEST);
1793                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1794                 }
1795
1796                 mutex_unlock(&local->sta_mtx);
1797         }
1798
1799         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1800                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1801
1802         /*
1803          * Reconfigure sched scan if it was interrupted by FW restart or
1804          * suspend.
1805          */
1806         mutex_lock(&local->mtx);
1807         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1808                                                 lockdep_is_held(&local->mtx));
1809         if (sched_scan_sdata && local->sched_scan_req)
1810                 /*
1811                  * Sched scan stopped, but we don't want to report it. Instead,
1812                  * we're trying to reschedule.
1813                  */
1814                 if (__ieee80211_request_sched_scan_start(sched_scan_sdata,
1815                                                          local->sched_scan_req))
1816                         sched_scan_stopped = true;
1817         mutex_unlock(&local->mtx);
1818
1819         if (sched_scan_stopped)
1820                 cfg80211_sched_scan_stopped(local->hw.wiphy);
1821
1822         /*
1823          * If this is for hw restart things are still running.
1824          * We may want to change that later, however.
1825          */
1826         if (!local->suspended || reconfig_due_to_wowlan)
1827                 drv_restart_complete(local);
1828
1829         if (!local->suspended)
1830                 return 0;
1831
1832 #ifdef CONFIG_PM
1833         /* first set suspended false, then resuming */
1834         local->suspended = false;
1835         mb();
1836         local->resuming = false;
1837
1838         list_for_each_entry(sdata, &local->interfaces, list) {
1839                 if (!ieee80211_sdata_running(sdata))
1840                         continue;
1841                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1842                         ieee80211_sta_restart(sdata);
1843         }
1844
1845         mod_timer(&local->sta_cleanup, jiffies + 1);
1846 #else
1847         WARN_ON(1);
1848 #endif
1849
1850         return 0;
1851 }
1852
1853 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1854 {
1855         struct ieee80211_sub_if_data *sdata;
1856         struct ieee80211_local *local;
1857         struct ieee80211_key *key;
1858
1859         if (WARN_ON(!vif))
1860                 return;
1861
1862         sdata = vif_to_sdata(vif);
1863         local = sdata->local;
1864
1865         if (WARN_ON(!local->resuming))
1866                 return;
1867
1868         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1869                 return;
1870
1871         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1872
1873         mutex_lock(&local->key_mtx);
1874         list_for_each_entry(key, &sdata->key_list, list)
1875                 key->flags |= KEY_FLAG_TAINTED;
1876         mutex_unlock(&local->key_mtx);
1877 }
1878 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1879
1880 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1881 {
1882         struct ieee80211_local *local = sdata->local;
1883         struct ieee80211_chanctx_conf *chanctx_conf;
1884         struct ieee80211_chanctx *chanctx;
1885
1886         mutex_lock(&local->chanctx_mtx);
1887
1888         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1889                                         lockdep_is_held(&local->chanctx_mtx));
1890
1891         if (WARN_ON_ONCE(!chanctx_conf))
1892                 goto unlock;
1893
1894         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1895         ieee80211_recalc_smps_chanctx(local, chanctx);
1896  unlock:
1897         mutex_unlock(&local->chanctx_mtx);
1898 }
1899
1900 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
1901 {
1902         struct ieee80211_local *local = sdata->local;
1903         struct ieee80211_chanctx_conf *chanctx_conf;
1904         struct ieee80211_chanctx *chanctx;
1905
1906         mutex_lock(&local->chanctx_mtx);
1907
1908         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1909                                         lockdep_is_held(&local->chanctx_mtx));
1910
1911         if (WARN_ON_ONCE(!chanctx_conf))
1912                 goto unlock;
1913
1914         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1915         ieee80211_recalc_chanctx_min_def(local, chanctx);
1916  unlock:
1917         mutex_unlock(&local->chanctx_mtx);
1918 }
1919
1920 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1921 {
1922         int i;
1923
1924         for (i = 0; i < n_ids; i++)
1925                 if (ids[i] == id)
1926                         return true;
1927         return false;
1928 }
1929
1930 /**
1931  * ieee80211_ie_split - split an IE buffer according to ordering
1932  *
1933  * @ies: the IE buffer
1934  * @ielen: the length of the IE buffer
1935  * @ids: an array with element IDs that are allowed before
1936  *      the split
1937  * @n_ids: the size of the element ID array
1938  * @offset: offset where to start splitting in the buffer
1939  *
1940  * This function splits an IE buffer by updating the @offset
1941  * variable to point to the location where the buffer should be
1942  * split.
1943  *
1944  * It assumes that the given IE buffer is well-formed, this
1945  * has to be guaranteed by the caller!
1946  *
1947  * It also assumes that the IEs in the buffer are ordered
1948  * correctly, if not the result of using this function will not
1949  * be ordered correctly either, i.e. it does no reordering.
1950  *
1951  * The function returns the offset where the next part of the
1952  * buffer starts, which may be @ielen if the entire (remainder)
1953  * of the buffer should be used.
1954  */
1955 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1956                           const u8 *ids, int n_ids, size_t offset)
1957 {
1958         size_t pos = offset;
1959
1960         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1961                 pos += 2 + ies[pos + 1];
1962
1963         return pos;
1964 }
1965
1966 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1967 {
1968         size_t pos = offset;
1969
1970         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1971                 pos += 2 + ies[pos + 1];
1972
1973         return pos;
1974 }
1975
1976 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1977                                             int rssi_min_thold,
1978                                             int rssi_max_thold)
1979 {
1980         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1981
1982         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1983                 return;
1984
1985         /*
1986          * Scale up threshold values before storing it, as the RSSI averaging
1987          * algorithm uses a scaled up value as well. Change this scaling
1988          * factor if the RSSI averaging algorithm changes.
1989          */
1990         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1991         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1992 }
1993
1994 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1995                                     int rssi_min_thold,
1996                                     int rssi_max_thold)
1997 {
1998         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1999
2000         WARN_ON(rssi_min_thold == rssi_max_thold ||
2001                 rssi_min_thold > rssi_max_thold);
2002
2003         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2004                                        rssi_max_thold);
2005 }
2006 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2007
2008 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2009 {
2010         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2011
2012         _ieee80211_enable_rssi_reports(sdata, 0, 0);
2013 }
2014 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2015
2016 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2017                               u16 cap)
2018 {
2019         __le16 tmp;
2020
2021         *pos++ = WLAN_EID_HT_CAPABILITY;
2022         *pos++ = sizeof(struct ieee80211_ht_cap);
2023         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2024
2025         /* capability flags */
2026         tmp = cpu_to_le16(cap);
2027         memcpy(pos, &tmp, sizeof(u16));
2028         pos += sizeof(u16);
2029
2030         /* AMPDU parameters */
2031         *pos++ = ht_cap->ampdu_factor |
2032                  (ht_cap->ampdu_density <<
2033                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2034
2035         /* MCS set */
2036         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2037         pos += sizeof(ht_cap->mcs);
2038
2039         /* extended capabilities */
2040         pos += sizeof(__le16);
2041
2042         /* BF capabilities */
2043         pos += sizeof(__le32);
2044
2045         /* antenna selection */
2046         pos += sizeof(u8);
2047
2048         return pos;
2049 }
2050
2051 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2052                                u32 cap)
2053 {
2054         __le32 tmp;
2055
2056         *pos++ = WLAN_EID_VHT_CAPABILITY;
2057         *pos++ = sizeof(struct ieee80211_vht_cap);
2058         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2059
2060         /* capability flags */
2061         tmp = cpu_to_le32(cap);
2062         memcpy(pos, &tmp, sizeof(u32));
2063         pos += sizeof(u32);
2064
2065         /* VHT MCS set */
2066         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2067         pos += sizeof(vht_cap->vht_mcs);
2068
2069         return pos;
2070 }
2071
2072 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2073                                const struct cfg80211_chan_def *chandef,
2074                                u16 prot_mode)
2075 {
2076         struct ieee80211_ht_operation *ht_oper;
2077         /* Build HT Information */
2078         *pos++ = WLAN_EID_HT_OPERATION;
2079         *pos++ = sizeof(struct ieee80211_ht_operation);
2080         ht_oper = (struct ieee80211_ht_operation *)pos;
2081         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2082                                         chandef->chan->center_freq);
2083         switch (chandef->width) {
2084         case NL80211_CHAN_WIDTH_160:
2085         case NL80211_CHAN_WIDTH_80P80:
2086         case NL80211_CHAN_WIDTH_80:
2087         case NL80211_CHAN_WIDTH_40:
2088                 if (chandef->center_freq1 > chandef->chan->center_freq)
2089                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2090                 else
2091                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2092                 break;
2093         default:
2094                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2095                 break;
2096         }
2097         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2098             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2099             chandef->width != NL80211_CHAN_WIDTH_20)
2100                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2101
2102         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2103         ht_oper->stbc_param = 0x0000;
2104
2105         /* It seems that Basic MCS set and Supported MCS set
2106            are identical for the first 10 bytes */
2107         memset(&ht_oper->basic_set, 0, 16);
2108         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2109
2110         return pos + sizeof(struct ieee80211_ht_operation);
2111 }
2112
2113 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2114                                   const struct ieee80211_ht_operation *ht_oper,
2115                                   struct cfg80211_chan_def *chandef)
2116 {
2117         enum nl80211_channel_type channel_type;
2118
2119         if (!ht_oper) {
2120                 cfg80211_chandef_create(chandef, control_chan,
2121                                         NL80211_CHAN_NO_HT);
2122                 return;
2123         }
2124
2125         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2126         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2127                 channel_type = NL80211_CHAN_HT20;
2128                 break;
2129         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2130                 channel_type = NL80211_CHAN_HT40PLUS;
2131                 break;
2132         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2133                 channel_type = NL80211_CHAN_HT40MINUS;
2134                 break;
2135         default:
2136                 channel_type = NL80211_CHAN_NO_HT;
2137         }
2138
2139         cfg80211_chandef_create(chandef, control_chan, channel_type);
2140 }
2141
2142 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2143                              const struct ieee80211_supported_band *sband,
2144                              const u8 *srates, int srates_len, u32 *rates)
2145 {
2146         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2147         int shift = ieee80211_chandef_get_shift(chandef);
2148         struct ieee80211_rate *br;
2149         int brate, rate, i, j, count = 0;
2150
2151         *rates = 0;
2152
2153         for (i = 0; i < srates_len; i++) {
2154                 rate = srates[i] & 0x7f;
2155
2156                 for (j = 0; j < sband->n_bitrates; j++) {
2157                         br = &sband->bitrates[j];
2158                         if ((rate_flags & br->flags) != rate_flags)
2159                                 continue;
2160
2161                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2162                         if (brate == rate) {
2163                                 *rates |= BIT(j);
2164                                 count++;
2165                                 break;
2166                         }
2167                 }
2168         }
2169         return count;
2170 }
2171
2172 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2173                             struct sk_buff *skb, bool need_basic,
2174                             enum ieee80211_band band)
2175 {
2176         struct ieee80211_local *local = sdata->local;
2177         struct ieee80211_supported_band *sband;
2178         int rate, shift;
2179         u8 i, rates, *pos;
2180         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2181         u32 rate_flags;
2182
2183         shift = ieee80211_vif_get_shift(&sdata->vif);
2184         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2185         sband = local->hw.wiphy->bands[band];
2186         rates = 0;
2187         for (i = 0; i < sband->n_bitrates; i++) {
2188                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2189                         continue;
2190                 rates++;
2191         }
2192         if (rates > 8)
2193                 rates = 8;
2194
2195         if (skb_tailroom(skb) < rates + 2)
2196                 return -ENOMEM;
2197
2198         pos = skb_put(skb, rates + 2);
2199         *pos++ = WLAN_EID_SUPP_RATES;
2200         *pos++ = rates;
2201         for (i = 0; i < rates; i++) {
2202                 u8 basic = 0;
2203                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2204                         continue;
2205
2206                 if (need_basic && basic_rates & BIT(i))
2207                         basic = 0x80;
2208                 rate = sband->bitrates[i].bitrate;
2209                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2210                                     5 * (1 << shift));
2211                 *pos++ = basic | (u8) rate;
2212         }
2213
2214         return 0;
2215 }
2216
2217 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2218                                 struct sk_buff *skb, bool need_basic,
2219                                 enum ieee80211_band band)
2220 {
2221         struct ieee80211_local *local = sdata->local;
2222         struct ieee80211_supported_band *sband;
2223         int rate, shift;
2224         u8 i, exrates, *pos;
2225         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2226         u32 rate_flags;
2227
2228         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2229         shift = ieee80211_vif_get_shift(&sdata->vif);
2230
2231         sband = local->hw.wiphy->bands[band];
2232         exrates = 0;
2233         for (i = 0; i < sband->n_bitrates; i++) {
2234                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2235                         continue;
2236                 exrates++;
2237         }
2238
2239         if (exrates > 8)
2240                 exrates -= 8;
2241         else
2242                 exrates = 0;
2243
2244         if (skb_tailroom(skb) < exrates + 2)
2245                 return -ENOMEM;
2246
2247         if (exrates) {
2248                 pos = skb_put(skb, exrates + 2);
2249                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2250                 *pos++ = exrates;
2251                 for (i = 8; i < sband->n_bitrates; i++) {
2252                         u8 basic = 0;
2253                         if ((rate_flags & sband->bitrates[i].flags)
2254                             != rate_flags)
2255                                 continue;
2256                         if (need_basic && basic_rates & BIT(i))
2257                                 basic = 0x80;
2258                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2259                                             5 * (1 << shift));
2260                         *pos++ = basic | (u8) rate;
2261                 }
2262         }
2263         return 0;
2264 }
2265
2266 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2267 {
2268         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2269         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2270
2271         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2272                 /* non-managed type inferfaces */
2273                 return 0;
2274         }
2275         return ifmgd->ave_beacon_signal / 16;
2276 }
2277 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2278
2279 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2280 {
2281         if (!mcs)
2282                 return 1;
2283
2284         /* TODO: consider rx_highest */
2285
2286         if (mcs->rx_mask[3])
2287                 return 4;
2288         if (mcs->rx_mask[2])
2289                 return 3;
2290         if (mcs->rx_mask[1])
2291                 return 2;
2292         return 1;
2293 }
2294
2295 /**
2296  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2297  * @local: mac80211 hw info struct
2298  * @status: RX status
2299  * @mpdu_len: total MPDU length (including FCS)
2300  * @mpdu_offset: offset into MPDU to calculate timestamp at
2301  *
2302  * This function calculates the RX timestamp at the given MPDU offset, taking
2303  * into account what the RX timestamp was. An offset of 0 will just normalize
2304  * the timestamp to TSF at beginning of MPDU reception.
2305  */
2306 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2307                                      struct ieee80211_rx_status *status,
2308                                      unsigned int mpdu_len,
2309                                      unsigned int mpdu_offset)
2310 {
2311         u64 ts = status->mactime;
2312         struct rate_info ri;
2313         u16 rate;
2314
2315         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2316                 return 0;
2317
2318         memset(&ri, 0, sizeof(ri));
2319
2320         /* Fill cfg80211 rate info */
2321         if (status->flag & RX_FLAG_HT) {
2322                 ri.mcs = status->rate_idx;
2323                 ri.flags |= RATE_INFO_FLAGS_MCS;
2324                 if (status->flag & RX_FLAG_40MHZ)
2325                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2326                 if (status->flag & RX_FLAG_SHORT_GI)
2327                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2328         } else if (status->flag & RX_FLAG_VHT) {
2329                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2330                 ri.mcs = status->rate_idx;
2331                 ri.nss = status->vht_nss;
2332                 if (status->flag & RX_FLAG_40MHZ)
2333                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2334                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2335                         ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2336                 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
2337                         ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2338                 if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2339                         ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2340                 if (status->flag & RX_FLAG_SHORT_GI)
2341                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2342         } else {
2343                 struct ieee80211_supported_band *sband;
2344                 int shift = 0;
2345                 int bitrate;
2346
2347                 if (status->flag & RX_FLAG_10MHZ)
2348                         shift = 1;
2349                 if (status->flag & RX_FLAG_5MHZ)
2350                         shift = 2;
2351
2352                 sband = local->hw.wiphy->bands[status->band];
2353                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2354                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2355         }
2356
2357         rate = cfg80211_calculate_bitrate(&ri);
2358         if (WARN_ONCE(!rate,
2359                       "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2360                       status->flag, status->rate_idx, status->vht_nss))
2361                 return 0;
2362
2363         /* rewind from end of MPDU */
2364         if (status->flag & RX_FLAG_MACTIME_END)
2365                 ts -= mpdu_len * 8 * 10 / rate;
2366
2367         ts += mpdu_offset * 8 * 10 / rate;
2368
2369         return ts;
2370 }
2371
2372 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2373 {
2374         struct ieee80211_sub_if_data *sdata;
2375         struct cfg80211_chan_def chandef;
2376
2377         mutex_lock(&local->mtx);
2378         mutex_lock(&local->iflist_mtx);
2379         list_for_each_entry(sdata, &local->interfaces, list) {
2380                 /* it might be waiting for the local->mtx, but then
2381                  * by the time it gets it, sdata->wdev.cac_started
2382                  * will no longer be true
2383                  */
2384                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2385
2386                 if (sdata->wdev.cac_started) {
2387                         chandef = sdata->vif.bss_conf.chandef;
2388                         ieee80211_vif_release_channel(sdata);
2389                         cfg80211_cac_event(sdata->dev,
2390                                            &chandef,
2391                                            NL80211_RADAR_CAC_ABORTED,
2392                                            GFP_KERNEL);
2393                 }
2394         }
2395         mutex_unlock(&local->iflist_mtx);
2396         mutex_unlock(&local->mtx);
2397 }
2398
2399 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2400 {
2401         struct ieee80211_local *local =
2402                 container_of(work, struct ieee80211_local, radar_detected_work);
2403         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2404
2405         ieee80211_dfs_cac_cancel(local);
2406
2407         if (local->use_chanctx)
2408                 /* currently not handled */
2409                 WARN_ON(1);
2410         else
2411                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2412 }
2413
2414 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2415 {
2416         struct ieee80211_local *local = hw_to_local(hw);
2417
2418         trace_api_radar_detected(local);
2419
2420         ieee80211_queue_work(hw, &local->radar_detected_work);
2421 }
2422 EXPORT_SYMBOL(ieee80211_radar_detected);
2423
2424 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2425 {
2426         u32 ret;
2427         int tmp;
2428
2429         switch (c->width) {
2430         case NL80211_CHAN_WIDTH_20:
2431                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2432                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2433                 break;
2434         case NL80211_CHAN_WIDTH_40:
2435                 c->width = NL80211_CHAN_WIDTH_20;
2436                 c->center_freq1 = c->chan->center_freq;
2437                 ret = IEEE80211_STA_DISABLE_40MHZ |
2438                       IEEE80211_STA_DISABLE_VHT;
2439                 break;
2440         case NL80211_CHAN_WIDTH_80:
2441                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2442                 /* n_P40 */
2443                 tmp /= 2;
2444                 /* freq_P40 */
2445                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2446                 c->width = NL80211_CHAN_WIDTH_40;
2447                 ret = IEEE80211_STA_DISABLE_VHT;
2448                 break;
2449         case NL80211_CHAN_WIDTH_80P80:
2450                 c->center_freq2 = 0;
2451                 c->width = NL80211_CHAN_WIDTH_80;
2452                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2453                       IEEE80211_STA_DISABLE_160MHZ;
2454                 break;
2455         case NL80211_CHAN_WIDTH_160:
2456                 /* n_P20 */
2457                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2458                 /* n_P80 */
2459                 tmp /= 4;
2460                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2461                 c->width = NL80211_CHAN_WIDTH_80;
2462                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2463                       IEEE80211_STA_DISABLE_160MHZ;
2464                 break;
2465         default:
2466         case NL80211_CHAN_WIDTH_20_NOHT:
2467                 WARN_ON_ONCE(1);
2468                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2469                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2470                 break;
2471         case NL80211_CHAN_WIDTH_5:
2472         case NL80211_CHAN_WIDTH_10:
2473                 WARN_ON_ONCE(1);
2474                 /* keep c->width */
2475                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2476                 break;
2477         }
2478
2479         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2480
2481         return ret;
2482 }
2483
2484 /*
2485  * Returns true if smps_mode_new is strictly more restrictive than
2486  * smps_mode_old.
2487  */
2488 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2489                                    enum ieee80211_smps_mode smps_mode_new)
2490 {
2491         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2492                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2493                 return false;
2494
2495         switch (smps_mode_old) {
2496         case IEEE80211_SMPS_STATIC:
2497                 return false;
2498         case IEEE80211_SMPS_DYNAMIC:
2499                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2500         case IEEE80211_SMPS_OFF:
2501                 return smps_mode_new != IEEE80211_SMPS_OFF;
2502         default:
2503                 WARN_ON(1);
2504         }
2505
2506         return false;
2507 }
2508
2509 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2510                               struct cfg80211_csa_settings *csa_settings)
2511 {
2512         struct sk_buff *skb;
2513         struct ieee80211_mgmt *mgmt;
2514         struct ieee80211_local *local = sdata->local;
2515         int freq;
2516         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2517                                sizeof(mgmt->u.action.u.chan_switch);
2518         u8 *pos;
2519
2520         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2521             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2522                 return -EOPNOTSUPP;
2523
2524         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2525                             5 + /* channel switch announcement element */
2526                             3 + /* secondary channel offset element */
2527                             8); /* mesh channel switch parameters element */
2528         if (!skb)
2529                 return -ENOMEM;
2530
2531         skb_reserve(skb, local->tx_headroom);
2532         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2533         memset(mgmt, 0, hdr_len);
2534         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2535                                           IEEE80211_STYPE_ACTION);
2536
2537         eth_broadcast_addr(mgmt->da);
2538         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2539         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2540                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2541         } else {
2542                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2543                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2544         }
2545         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2546         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2547         pos = skb_put(skb, 5);
2548         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
2549         *pos++ = 3;                                             /* IE length */
2550         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
2551         freq = csa_settings->chandef.chan->center_freq;
2552         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
2553         *pos++ = csa_settings->count;                           /* count */
2554
2555         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2556                 enum nl80211_channel_type ch_type;
2557
2558                 skb_put(skb, 3);
2559                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
2560                 *pos++ = 1;                                     /* IE length */
2561                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2562                 if (ch_type == NL80211_CHAN_HT40PLUS)
2563                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2564                 else
2565                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2566         }
2567
2568         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2569                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2570
2571                 skb_put(skb, 8);
2572                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
2573                 *pos++ = 6;                                     /* IE length */
2574                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
2575                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
2576                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2577                 *pos++ |= csa_settings->block_tx ?
2578                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2579                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2580                 pos += 2;
2581                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2582                 pos += 2;
2583         }
2584
2585         ieee80211_tx_skb(sdata, skb);
2586         return 0;
2587 }
2588
2589 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2590 {
2591         return !(cs == NULL || cs->cipher == 0 ||
2592                  cs->hdr_len < cs->pn_len + cs->pn_off ||
2593                  cs->hdr_len <= cs->key_idx_off ||
2594                  cs->key_idx_shift > 7 ||
2595                  cs->key_idx_mask == 0);
2596 }
2597
2598 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2599 {
2600         int i;
2601
2602         /* Ensure we have enough iftype bitmap space for all iftype values */
2603         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2604
2605         for (i = 0; i < n; i++)
2606                 if (!ieee80211_cs_valid(&cs[i]))
2607                         return false;
2608
2609         return true;
2610 }
2611
2612 const struct ieee80211_cipher_scheme *
2613 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2614                  enum nl80211_iftype iftype)
2615 {
2616         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2617         int n = local->hw.n_cipher_schemes;
2618         int i;
2619         const struct ieee80211_cipher_scheme *cs = NULL;
2620
2621         for (i = 0; i < n; i++) {
2622                 if (l[i].cipher == cipher) {
2623                         cs = &l[i];
2624                         break;
2625                 }
2626         }
2627
2628         if (!cs || !(cs->iftype & BIT(iftype)))
2629                 return NULL;
2630
2631         return cs;
2632 }
2633
2634 int ieee80211_cs_headroom(struct ieee80211_local *local,
2635                           struct cfg80211_crypto_settings *crypto,
2636                           enum nl80211_iftype iftype)
2637 {
2638         const struct ieee80211_cipher_scheme *cs;
2639         int headroom = IEEE80211_ENCRYPT_HEADROOM;
2640         int i;
2641
2642         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
2643                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
2644                                       iftype);
2645
2646                 if (cs && headroom < cs->hdr_len)
2647                         headroom = cs->hdr_len;
2648         }
2649
2650         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
2651         if (cs && headroom < cs->hdr_len)
2652                 headroom = cs->hdr_len;
2653
2654         return headroom;
2655 }
2656
2657 static bool
2658 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
2659 {
2660         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
2661         int skip;
2662
2663         if (end > 0)
2664                 return false;
2665
2666         /* End time is in the past, check for repetitions */
2667         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
2668         if (data->count[i] < 255) {
2669                 if (data->count[i] <= skip) {
2670                         data->count[i] = 0;
2671                         return false;
2672                 }
2673
2674                 data->count[i] -= skip;
2675         }
2676
2677         data->desc[i].start += skip * data->desc[i].interval;
2678
2679         return true;
2680 }
2681
2682 static bool
2683 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
2684                              s32 *offset)
2685 {
2686         bool ret = false;
2687         int i;
2688
2689         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2690                 s32 cur;
2691
2692                 if (!data->count[i])
2693                         continue;
2694
2695                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
2696                         ret = true;
2697
2698                 cur = data->desc[i].start - tsf;
2699                 if (cur > *offset)
2700                         continue;
2701
2702                 cur = data->desc[i].start + data->desc[i].duration - tsf;
2703                 if (cur > *offset)
2704                         *offset = cur;
2705         }
2706
2707         return ret;
2708 }
2709
2710 static u32
2711 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
2712 {
2713         s32 offset = 0;
2714         int tries = 0;
2715         /*
2716          * arbitrary limit, used to avoid infinite loops when combined NoA
2717          * descriptors cover the full time period.
2718          */
2719         int max_tries = 5;
2720
2721         ieee80211_extend_absent_time(data, tsf, &offset);
2722         do {
2723                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
2724                         break;
2725
2726                 tries++;
2727         } while (tries < max_tries);
2728
2729         return offset;
2730 }
2731
2732 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
2733 {
2734         u32 next_offset = BIT(31) - 1;
2735         int i;
2736
2737         data->absent = 0;
2738         data->has_next_tsf = false;
2739         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2740                 s32 start;
2741
2742                 if (!data->count[i])
2743                         continue;
2744
2745                 ieee80211_extend_noa_desc(data, tsf, i);
2746                 start = data->desc[i].start - tsf;
2747                 if (start <= 0)
2748                         data->absent |= BIT(i);
2749
2750                 if (next_offset > start)
2751                         next_offset = start;
2752
2753                 data->has_next_tsf = true;
2754         }
2755
2756         if (data->absent)
2757                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
2758
2759         data->next_tsf = tsf + next_offset;
2760 }
2761 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
2762
2763 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
2764                             struct ieee80211_noa_data *data, u32 tsf)
2765 {
2766         int ret = 0;
2767         int i;
2768
2769         memset(data, 0, sizeof(*data));
2770
2771         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2772                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
2773
2774                 if (!desc->count || !desc->duration)
2775                         continue;
2776
2777                 data->count[i] = desc->count;
2778                 data->desc[i].start = le32_to_cpu(desc->start_time);
2779                 data->desc[i].duration = le32_to_cpu(desc->duration);
2780                 data->desc[i].interval = le32_to_cpu(desc->interval);
2781
2782                 if (data->count[i] > 1 &&
2783                     data->desc[i].interval < data->desc[i].duration)
2784                         continue;
2785
2786                 ieee80211_extend_noa_desc(data, tsf, i);
2787                 ret++;
2788         }
2789
2790         if (ret)
2791                 ieee80211_update_p2p_noa(data, tsf);
2792
2793         return ret;
2794 }
2795 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
2796
2797 void ieee80211_recalc_dtim(struct ieee80211_local *local,
2798                            struct ieee80211_sub_if_data *sdata)
2799 {
2800         u64 tsf = drv_get_tsf(local, sdata);
2801         u64 dtim_count = 0;
2802         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
2803         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
2804         struct ps_data *ps;
2805         u8 bcns_from_dtim;
2806
2807         if (tsf == -1ULL || !beacon_int || !dtim_period)
2808                 return;
2809
2810         if (sdata->vif.type == NL80211_IFTYPE_AP ||
2811             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
2812                 if (!sdata->bss)
2813                         return;
2814
2815                 ps = &sdata->bss->ps;
2816         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2817                 ps = &sdata->u.mesh.ps;
2818         } else {
2819                 return;
2820         }
2821
2822         /*
2823          * actually finds last dtim_count, mac80211 will update in
2824          * __beacon_add_tim().
2825          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
2826          */
2827         do_div(tsf, beacon_int);
2828         bcns_from_dtim = do_div(tsf, dtim_period);
2829         /* just had a DTIM */
2830         if (!bcns_from_dtim)
2831                 dtim_count = 0;
2832         else
2833                 dtim_count = dtim_period - bcns_from_dtim;
2834
2835         ps->dtim_count = dtim_count;
2836 }
2837
2838 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
2839                                  const struct cfg80211_chan_def *chandef,
2840                                  enum ieee80211_chanctx_mode chanmode,
2841                                  u8 radar_detect)
2842 {
2843         struct ieee80211_local *local = sdata->local;
2844         struct ieee80211_sub_if_data *sdata_iter;
2845         enum nl80211_iftype iftype = sdata->wdev.iftype;
2846         int num[NUM_NL80211_IFTYPES];
2847         struct ieee80211_chanctx *ctx;
2848         int num_different_channels = 0;
2849         int total = 1;
2850
2851         lockdep_assert_held(&local->chanctx_mtx);
2852
2853         if (WARN_ON(hweight32(radar_detect) > 1))
2854                 return -EINVAL;
2855
2856         if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
2857                     !chandef->chan))
2858                 return -EINVAL;
2859
2860         if (chandef)
2861                 num_different_channels = 1;
2862
2863         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
2864                 return -EINVAL;
2865
2866         /* Always allow software iftypes */
2867         if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
2868                 if (radar_detect)
2869                         return -EINVAL;
2870                 return 0;
2871         }
2872
2873         memset(num, 0, sizeof(num));
2874
2875         if (iftype != NL80211_IFTYPE_UNSPECIFIED)
2876                 num[iftype] = 1;
2877
2878         list_for_each_entry(ctx, &local->chanctx_list, list) {
2879                 if (ctx->conf.radar_enabled)
2880                         radar_detect |= BIT(ctx->conf.def.width);
2881                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
2882                         num_different_channels++;
2883                         continue;
2884                 }
2885                 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
2886                     cfg80211_chandef_compatible(chandef,
2887                                                 &ctx->conf.def))
2888                         continue;
2889                 num_different_channels++;
2890         }
2891
2892         list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
2893                 struct wireless_dev *wdev_iter;
2894
2895                 wdev_iter = &sdata_iter->wdev;
2896
2897                 if (sdata_iter == sdata ||
2898                     rcu_access_pointer(sdata_iter->vif.chanctx_conf) == NULL ||
2899                     local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
2900                         continue;
2901
2902                 num[wdev_iter->iftype]++;
2903                 total++;
2904         }
2905
2906         if (total == 1 && !radar_detect)
2907                 return 0;
2908
2909         return cfg80211_check_combinations(local->hw.wiphy,
2910                                            num_different_channels,
2911                                            radar_detect, num);
2912 }
2913
2914 static void
2915 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
2916                          void *data)
2917 {
2918         u32 *max_num_different_channels = data;
2919
2920         *max_num_different_channels = max(*max_num_different_channels,
2921                                           c->num_different_channels);
2922 }
2923
2924 int ieee80211_max_num_channels(struct ieee80211_local *local)
2925 {
2926         struct ieee80211_sub_if_data *sdata;
2927         int num[NUM_NL80211_IFTYPES] = {};
2928         struct ieee80211_chanctx *ctx;
2929         int num_different_channels = 0;
2930         u8 radar_detect = 0;
2931         u32 max_num_different_channels = 1;
2932         int err;
2933
2934         lockdep_assert_held(&local->chanctx_mtx);
2935
2936         list_for_each_entry(ctx, &local->chanctx_list, list) {
2937                 num_different_channels++;
2938
2939                 if (ctx->conf.radar_enabled)
2940                         radar_detect |= BIT(ctx->conf.def.width);
2941         }
2942
2943         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2944                 num[sdata->wdev.iftype]++;
2945
2946         err = cfg80211_iter_combinations(local->hw.wiphy,
2947                                          num_different_channels, radar_detect,
2948                                          num, ieee80211_iter_max_chans,
2949                                          &max_num_different_channels);
2950         if (err < 0)
2951                 return err;
2952
2953         return max_num_different_channels;
2954 }