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