net/mac80211/util.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * utilities for mac80211
  12  */
  13
  14 #include <net/mac80211.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/export.h>
  17 #include <linux/types.h>
  18 #include <linux/slab.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/crc32.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/rtnetlink.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wme.h"
  33 #include "led.h"
  34 #include "wep.h"
  35
  36 /* privid for wiphys to determine whether they belong to us or not */
  37 const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid;
  38
  39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  40 {
  41         struct ieee80211_local *local;
  42         BUG_ON(!wiphy);
  43
  44         local = wiphy_priv(wiphy);
  45         return &local->hw;
  46 }
  47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  48
  49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  50                         enum nl80211_iftype type)
  51 {
  52         __le16 fc = hdr->frame_control;
  53
  54          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  55         if (len < 16)
  56                 return NULL;
  57
  58         if (ieee80211_is_data(fc)) {
  59                 if (len < 24) /* drop incorrect hdr len (data) */
  60                         return NULL;
  61
  62                 if (ieee80211_has_a4(fc))
  63                         return NULL;
  64                 if (ieee80211_has_tods(fc))
  65                         return hdr->addr1;
  66                 if (ieee80211_has_fromds(fc))
  67                         return hdr->addr2;
  68
  69                 return hdr->addr3;
  70         }
  71
  72         if (ieee80211_is_mgmt(fc)) {
  73                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  74                         return NULL;
  75                 return hdr->addr3;
  76         }
  77
  78         if (ieee80211_is_ctl(fc)) {
  79                 if (ieee80211_is_pspoll(fc))
  80                         return hdr->addr1;
  81
  82                 if (ieee80211_is_back_req(fc)) {
  83                         switch (type) {
  84                         case NL80211_IFTYPE_STATION:
  85                                 return hdr->addr2;
  86                         case NL80211_IFTYPE_AP:
  87                         case NL80211_IFTYPE_AP_VLAN:
  88                                 return hdr->addr1;
  89                         default:
  90                                 break; /* fall through to the return */
  91                         }
  92                 }
  93         }
  94
  95         return NULL;
  96 }
  97
  98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  99 {
 100         struct sk_buff *skb;
 101         struct ieee80211_hdr *hdr;
 102
 103         skb_queue_walk(&tx->skbs, skb) {
 104                 hdr = (struct ieee80211_hdr *) skb->data;
 105                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 106         }
 107 }
 108
 109 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
 110                              int rate, int erp, int short_preamble,
 111                              int shift)
 112 {
 113         int dur;
 114
 115         /* calculate duration (in microseconds, rounded up to next higher
 116          * integer if it includes a fractional microsecond) to send frame of
 117          * len bytes (does not include FCS) at the given rate. Duration will
 118          * also include SIFS.
 119          *
 120          * rate is in 100 kbps, so divident is multiplied by 10 in the
 121          * DIV_ROUND_UP() operations.
 122          *
 123          * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
 124          * is assumed to be 0 otherwise.
 125          */
 126
 127         if (band == IEEE80211_BAND_5GHZ || erp) {
 128                 /*
 129                  * OFDM:
 130                  *
 131                  * N_DBPS = DATARATE x 4
 132                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 133                  *      (16 = SIGNAL time, 6 = tail bits)
 134                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 135                  *
 136                  * T_SYM = 4 usec
 137                  * 802.11a - 18.5.2: aSIFSTime = 16 usec
 138                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 139                  *      signal ext = 6 usec
 140                  */
 141                 dur = 16; /* SIFS + signal ext */
 142                 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
 143                 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
 144
 145                 /* IEEE 802.11-2012 18.3.2.4: all values above are:
 146                  *  * times 4 for 5 MHz
 147                  *  * times 2 for 10 MHz
 148                  */
 149                 dur *= 1 << shift;
 150
 151                 /* rates should already consider the channel bandwidth,
 152                  * don't apply divisor again.
 153                  */
 154                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 155                                         4 * rate); /* T_SYM x N_SYM */
 156         } else {
 157                 /*
 158                  * 802.11b or 802.11g with 802.11b compatibility:
 159                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 160                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 161                  *
 162                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 163                  * aSIFSTime = 10 usec
 164                  * aPreambleLength = 144 usec or 72 usec with short preamble
 165                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 166                  */
 167                 dur = 10; /* aSIFSTime = 10 usec */
 168                 dur += short_preamble ? (72 + 24) : (144 + 48);
 169
 170                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 171         }
 172
 173         return dur;
 174 }
 175
 176 /* Exported duration function for driver use */
 177 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 178                                         struct ieee80211_vif *vif,
 179                                         enum ieee80211_band band,
 180                                         size_t frame_len,
 181                                         struct ieee80211_rate *rate)
 182 {
 183         struct ieee80211_sub_if_data *sdata;
 184         u16 dur;
 185         int erp, shift = 0;
 186         bool short_preamble = false;
 187
 188         erp = 0;
 189         if (vif) {
 190                 sdata = vif_to_sdata(vif);
 191                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 192                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 193                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 194                 shift = ieee80211_vif_get_shift(vif);
 195         }
 196
 197         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 198                                        short_preamble, shift);
 199
 200         return cpu_to_le16(dur);
 201 }
 202 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 203
 204 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 205                               struct ieee80211_vif *vif, size_t frame_len,
 206                               const struct ieee80211_tx_info *frame_txctl)
 207 {
 208         struct ieee80211_local *local = hw_to_local(hw);
 209         struct ieee80211_rate *rate;
 210         struct ieee80211_sub_if_data *sdata;
 211         bool short_preamble;
 212         int erp, shift = 0, bitrate;
 213         u16 dur;
 214         struct ieee80211_supported_band *sband;
 215
 216         sband = local->hw.wiphy->bands[frame_txctl->band];
 217
 218         short_preamble = false;
 219
 220         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 221
 222         erp = 0;
 223         if (vif) {
 224                 sdata = vif_to_sdata(vif);
 225                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 226                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 227                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 228                 shift = ieee80211_vif_get_shift(vif);
 229         }
 230
 231         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 232
 233         /* CTS duration */
 234         dur = ieee80211_frame_duration(sband->band, 10, bitrate,
 235                                        erp, short_preamble, shift);
 236         /* Data frame duration */
 237         dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
 238                                         erp, short_preamble, shift);
 239         /* ACK duration */
 240         dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 241                                         erp, short_preamble, shift);
 242
 243         return cpu_to_le16(dur);
 244 }
 245 EXPORT_SYMBOL(ieee80211_rts_duration);
 246
 247 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 248                                     struct ieee80211_vif *vif,
 249                                     size_t frame_len,
 250                                     const struct ieee80211_tx_info *frame_txctl)
 251 {
 252         struct ieee80211_local *local = hw_to_local(hw);
 253         struct ieee80211_rate *rate;
 254         struct ieee80211_sub_if_data *sdata;
 255         bool short_preamble;
 256         int erp, shift = 0, bitrate;
 257         u16 dur;
 258         struct ieee80211_supported_band *sband;
 259
 260         sband = local->hw.wiphy->bands[frame_txctl->band];
 261
 262         short_preamble = false;
 263
 264         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 265         erp = 0;
 266         if (vif) {
 267                 sdata = vif_to_sdata(vif);
 268                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 269                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 270                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 271                 shift = ieee80211_vif_get_shift(vif);
 272         }
 273
 274         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 275
 276         /* Data frame duration */
 277         dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
 278                                        erp, short_preamble, shift);
 279         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 280                 /* ACK duration */
 281                 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 282                                                 erp, short_preamble, shift);
 283         }
 284
 285         return cpu_to_le16(dur);
 286 }
 287 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 288
 289 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 290 {
 291         struct ieee80211_sub_if_data *sdata;
 292         int n_acs = IEEE80211_NUM_ACS;
 293
 294         if (local->hw.queues < IEEE80211_NUM_ACS)
 295                 n_acs = 1;
 296
 297         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 298                 int ac;
 299
 300                 if (!sdata->dev)
 301                         continue;
 302
 303                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 304                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 305                         continue;
 306
 307                 for (ac = 0; ac < n_acs; ac++) {
 308                         int ac_queue = sdata->vif.hw_queue[ac];
 309
 310                         if (ac_queue == queue ||
 311                             (sdata->vif.cab_queue == queue &&
 312                              local->queue_stop_reasons[ac_queue] == 0 &&
 313                              skb_queue_empty(&local->pending[ac_queue])))
 314                                 netif_wake_subqueue(sdata->dev, ac);
 315                 }
 316         }
 317 }
 318
 319 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 320                                    enum queue_stop_reason reason)
 321 {
 322         struct ieee80211_local *local = hw_to_local(hw);
 323
 324         trace_wake_queue(local, queue, reason);
 325
 326         if (WARN_ON(queue >= hw->queues))
 327                 return;
 328
 329         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 330                 return;
 331
 332         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 333
 334         if (local->queue_stop_reasons[queue] != 0)
 335                 /* someone still has this queue stopped */
 336                 return;
 337
 338         if (skb_queue_empty(&local->pending[queue])) {
 339                 rcu_read_lock();
 340                 ieee80211_propagate_queue_wake(local, queue);
 341                 rcu_read_unlock();
 342         } else
 343                 tasklet_schedule(&local->tx_pending_tasklet);
 344 }
 345
 346 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 347                                     enum queue_stop_reason reason)
 348 {
 349         struct ieee80211_local *local = hw_to_local(hw);
 350         unsigned long flags;
 351
 352         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 353         __ieee80211_wake_queue(hw, queue, reason);
 354         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 355 }
 356
 357 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 358 {
 359         ieee80211_wake_queue_by_reason(hw, queue,
 360                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 361 }
 362 EXPORT_SYMBOL(ieee80211_wake_queue);
 363
 364 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 365                                    enum queue_stop_reason reason)
 366 {
 367         struct ieee80211_local *local = hw_to_local(hw);
 368         struct ieee80211_sub_if_data *sdata;
 369         int n_acs = IEEE80211_NUM_ACS;
 370
 371         trace_stop_queue(local, queue, reason);
 372
 373         if (WARN_ON(queue >= hw->queues))
 374                 return;
 375
 376         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 377                 return;
 378
 379         __set_bit(reason, &local->queue_stop_reasons[queue]);
 380
 381         if (local->hw.queues < IEEE80211_NUM_ACS)
 382                 n_acs = 1;
 383
 384         rcu_read_lock();
 385         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 386                 int ac;
 387
 388                 if (!sdata->dev)
 389                         continue;
 390
 391                 for (ac = 0; ac < n_acs; ac++) {
 392                         if (sdata->vif.hw_queue[ac] == queue ||
 393                             sdata->vif.cab_queue == queue)
 394                                 netif_stop_subqueue(sdata->dev, ac);
 395                 }
 396         }
 397         rcu_read_unlock();
 398 }
 399
 400 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 401                                     enum queue_stop_reason reason)
 402 {
 403         struct ieee80211_local *local = hw_to_local(hw);
 404         unsigned long flags;
 405
 406         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 407         __ieee80211_stop_queue(hw, queue, reason);
 408         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 409 }
 410
 411 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 412 {
 413         ieee80211_stop_queue_by_reason(hw, queue,
 414                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 415 }
 416 EXPORT_SYMBOL(ieee80211_stop_queue);
 417
 418 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 419                                struct sk_buff *skb)
 420 {
 421         struct ieee80211_hw *hw = &local->hw;
 422         unsigned long flags;
 423         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 424         int queue = info->hw_queue;
 425
 426         if (WARN_ON(!info->control.vif)) {
 427                 ieee80211_free_txskb(&local->hw, skb);
 428                 return;
 429         }
 430
 431         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 432         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 433         __skb_queue_tail(&local->pending[queue], skb);
 434         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 435         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 436 }
 437
 438 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 439                                    struct sk_buff_head *skbs,
 440                                    void (*fn)(void *data), void *data)
 441 {
 442         struct ieee80211_hw *hw = &local->hw;
 443         struct sk_buff *skb;
 444         unsigned long flags;
 445         int queue, i;
 446
 447         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 448         while ((skb = skb_dequeue(skbs))) {
 449                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 450
 451                 if (WARN_ON(!info->control.vif)) {
 452                         ieee80211_free_txskb(&local->hw, skb);
 453                         continue;
 454                 }
 455
 456                 queue = info->hw_queue;
 457
 458                 __ieee80211_stop_queue(hw, queue,
 459                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 460
 461                 __skb_queue_tail(&local->pending[queue], skb);
 462         }
 463
 464         if (fn)
 465                 fn(data);
 466
 467         for (i = 0; i < hw->queues; i++)
 468                 __ieee80211_wake_queue(hw, i,
 469                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 470         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 471 }
 472
 473 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 474                                      unsigned long queues,
 475                                      enum queue_stop_reason reason)
 476 {
 477         struct ieee80211_local *local = hw_to_local(hw);
 478         unsigned long flags;
 479         int i;
 480
 481         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 482
 483         for_each_set_bit(i, &queues, hw->queues)
 484                 __ieee80211_stop_queue(hw, i, reason);
 485
 486         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 487 }
 488
 489 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 490 {
 491         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 492                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 493 }
 494 EXPORT_SYMBOL(ieee80211_stop_queues);
 495
 496 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 497 {
 498         struct ieee80211_local *local = hw_to_local(hw);
 499         unsigned long flags;
 500         int ret;
 501
 502         if (WARN_ON(queue >= hw->queues))
 503                 return true;
 504
 505         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 506         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 507                        &local->queue_stop_reasons[queue]);
 508         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 509         return ret;
 510 }
 511 EXPORT_SYMBOL(ieee80211_queue_stopped);
 512
 513 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 514                                      unsigned long queues,
 515                                      enum queue_stop_reason reason)
 516 {
 517         struct ieee80211_local *local = hw_to_local(hw);
 518         unsigned long flags;
 519         int i;
 520
 521         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 522
 523         for_each_set_bit(i, &queues, hw->queues)
 524                 __ieee80211_wake_queue(hw, i, reason);
 525
 526         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 527 }
 528
 529 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 530 {
 531         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 532                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 533 }
 534 EXPORT_SYMBOL(ieee80211_wake_queues);
 535
 536 void ieee80211_flush_queues(struct ieee80211_local *local,
 537                             struct ieee80211_sub_if_data *sdata)
 538 {
 539         u32 queues;
 540
 541         if (!local->ops->flush)
 542                 return;
 543
 544         if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
 545                 int ac;
 546
 547                 queues = 0;
 548
 549                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 550                         queues |= BIT(sdata->vif.hw_queue[ac]);
 551                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 552                         queues |= BIT(sdata->vif.cab_queue);
 553         } else {
 554                 /* all queues */
 555                 queues = BIT(local->hw.queues) - 1;
 556         }
 557
 558         ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 559                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 560
 561         drv_flush(local, queues, false);
 562
 563         ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 564                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 565 }
 566
 567 static void __iterate_active_interfaces(struct ieee80211_local *local,
 568                                         u32 iter_flags,
 569                                         void (*iterator)(void *data, u8 *mac,
 570                                                 struct ieee80211_vif *vif),
 571                                         void *data)
 572 {
 573         struct ieee80211_sub_if_data *sdata;
 574
 575         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 576                 switch (sdata->vif.type) {
 577                 case NL80211_IFTYPE_MONITOR:
 578                         if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 579                                 continue;
 580                         break;
 581                 case NL80211_IFTYPE_AP_VLAN:
 582                         continue;
 583                 default:
 584                         break;
 585                 }
 586                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 587                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 588                         continue;
 589                 if (ieee80211_sdata_running(sdata))
 590                         iterator(data, sdata->vif.addr,
 591                                  &sdata->vif);
 592         }
 593
 594         sdata = rcu_dereference_check(local->monitor_sdata,
 595                                       lockdep_is_held(&local->iflist_mtx) ||
 596                                       lockdep_rtnl_is_held());
 597         if (sdata &&
 598             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 599              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 600                 iterator(data, sdata->vif.addr, &sdata->vif);
 601 }
 602
 603 void ieee80211_iterate_active_interfaces(
 604         struct ieee80211_hw *hw, u32 iter_flags,
 605         void (*iterator)(void *data, u8 *mac,
 606                          struct ieee80211_vif *vif),
 607         void *data)
 608 {
 609         struct ieee80211_local *local = hw_to_local(hw);
 610
 611         mutex_lock(&local->iflist_mtx);
 612         __iterate_active_interfaces(local, iter_flags, iterator, data);
 613         mutex_unlock(&local->iflist_mtx);
 614 }
 615 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 616
 617 void ieee80211_iterate_active_interfaces_atomic(
 618         struct ieee80211_hw *hw, u32 iter_flags,
 619         void (*iterator)(void *data, u8 *mac,
 620                          struct ieee80211_vif *vif),
 621         void *data)
 622 {
 623         struct ieee80211_local *local = hw_to_local(hw);
 624
 625         rcu_read_lock();
 626         __iterate_active_interfaces(local, iter_flags, iterator, data);
 627         rcu_read_unlock();
 628 }
 629 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 630
 631 void ieee80211_iterate_active_interfaces_rtnl(
 632         struct ieee80211_hw *hw, u32 iter_flags,
 633         void (*iterator)(void *data, u8 *mac,
 634                          struct ieee80211_vif *vif),
 635         void *data)
 636 {
 637         struct ieee80211_local *local = hw_to_local(hw);
 638
 639         ASSERT_RTNL();
 640
 641         __iterate_active_interfaces(local, iter_flags, iterator, data);
 642 }
 643 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
 644
 645 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
 646 {
 647         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 648
 649         if (!ieee80211_sdata_running(sdata) ||
 650             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 651                 return NULL;
 652         return &sdata->vif;
 653 }
 654 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
 655
 656 /*
 657  * Nothing should have been stuffed into the workqueue during
 658  * the suspend->resume cycle. If this WARN is seen then there
 659  * is a bug with either the driver suspend or something in
 660  * mac80211 stuffing into the workqueue which we haven't yet
 661  * cleared during mac80211's suspend cycle.
 662  */
 663 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 664 {
 665         if (WARN(local->suspended && !local->resuming,
 666                  "queueing ieee80211 work while going to suspend\n"))
 667                 return false;
 668
 669         return true;
 670 }
 671
 672 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 673 {
 674         struct ieee80211_local *local = hw_to_local(hw);
 675
 676         if (!ieee80211_can_queue_work(local))
 677                 return;
 678
 679         queue_work(local->workqueue, work);
 680 }
 681 EXPORT_SYMBOL(ieee80211_queue_work);
 682
 683 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 684                                   struct delayed_work *dwork,
 685                                   unsigned long delay)
 686 {
 687         struct ieee80211_local *local = hw_to_local(hw);
 688
 689         if (!ieee80211_can_queue_work(local))
 690                 return;
 691
 692         queue_delayed_work(local->workqueue, dwork, delay);
 693 }
 694 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 695
 696 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 697                                struct ieee802_11_elems *elems,
 698                                u64 filter, u32 crc)
 699 {
 700         size_t left = len;
 701         const u8 *pos = start;
 702         bool calc_crc = filter != 0;
 703         DECLARE_BITMAP(seen_elems, 256);
 704         const u8 *ie;
 705
 706         bitmap_zero(seen_elems, 256);
 707         memset(elems, 0, sizeof(*elems));
 708         elems->ie_start = start;
 709         elems->total_len = len;
 710
 711         while (left >= 2) {
 712                 u8 id, elen;
 713                 bool elem_parse_failed;
 714
 715                 id = *pos++;
 716                 elen = *pos++;
 717                 left -= 2;
 718
 719                 if (elen > left) {
 720                         elems->parse_error = true;
 721                         break;
 722                 }
 723
 724                 switch (id) {
 725                 case WLAN_EID_SSID:
 726                 case WLAN_EID_SUPP_RATES:
 727                 case WLAN_EID_FH_PARAMS:
 728                 case WLAN_EID_DS_PARAMS:
 729                 case WLAN_EID_CF_PARAMS:
 730                 case WLAN_EID_TIM:
 731                 case WLAN_EID_IBSS_PARAMS:
 732                 case WLAN_EID_CHALLENGE:
 733                 case WLAN_EID_RSN:
 734                 case WLAN_EID_ERP_INFO:
 735                 case WLAN_EID_EXT_SUPP_RATES:
 736                 case WLAN_EID_HT_CAPABILITY:
 737                 case WLAN_EID_HT_OPERATION:
 738                 case WLAN_EID_VHT_CAPABILITY:
 739                 case WLAN_EID_VHT_OPERATION:
 740                 case WLAN_EID_MESH_ID:
 741                 case WLAN_EID_MESH_CONFIG:
 742                 case WLAN_EID_PEER_MGMT:
 743                 case WLAN_EID_PREQ:
 744                 case WLAN_EID_PREP:
 745                 case WLAN_EID_PERR:
 746                 case WLAN_EID_RANN:
 747                 case WLAN_EID_CHANNEL_SWITCH:
 748                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 749                 case WLAN_EID_COUNTRY:
 750                 case WLAN_EID_PWR_CONSTRAINT:
 751                 case WLAN_EID_TIMEOUT_INTERVAL:
 752                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 753                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 754                 case WLAN_EID_CHAN_SWITCH_PARAM:
 755                 /*
 756                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 757                  * that if the content gets bigger it might be needed more than once
 758                  */
 759                         if (test_bit(id, seen_elems)) {
 760                                 elems->parse_error = true;
 761                                 left -= elen;
 762                                 pos += elen;
 763                                 continue;
 764                         }
 765                         break;
 766                 }
 767
 768                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 769                         crc = crc32_be(crc, pos - 2, elen + 2);
 770
 771                 elem_parse_failed = false;
 772
 773                 switch (id) {
 774                 case WLAN_EID_SSID:
 775                         elems->ssid = pos;
 776                         elems->ssid_len = elen;
 777                         break;
 778                 case WLAN_EID_SUPP_RATES:
 779                         elems->supp_rates = pos;
 780                         elems->supp_rates_len = elen;
 781                         break;
 782                 case WLAN_EID_DS_PARAMS:
 783                         if (elen >= 1)
 784                                 elems->ds_params = pos;
 785                         else
 786                                 elem_parse_failed = true;
 787                         break;
 788                 case WLAN_EID_TIM:
 789                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 790                                 elems->tim = (void *)pos;
 791                                 elems->tim_len = elen;
 792                         } else
 793                                 elem_parse_failed = true;
 794                         break;
 795                 case WLAN_EID_CHALLENGE:
 796                         elems->challenge = pos;
 797                         elems->challenge_len = elen;
 798                         break;
 799                 case WLAN_EID_VENDOR_SPECIFIC:
 800                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 801                             pos[2] == 0xf2) {
 802                                 /* Microsoft OUI (00:50:F2) */
 803
 804                                 if (calc_crc)
 805                                         crc = crc32_be(crc, pos - 2, elen + 2);
 806
 807                                 if (elen >= 5 && pos[3] == 2) {
 808                                         /* OUI Type 2 - WMM IE */
 809                                         if (pos[4] == 0) {
 810                                                 elems->wmm_info = pos;
 811                                                 elems->wmm_info_len = elen;
 812                                         } else if (pos[4] == 1) {
 813                                                 elems->wmm_param = pos;
 814                                                 elems->wmm_param_len = elen;
 815                                         }
 816                                 }
 817                         }
 818                         break;
 819                 case WLAN_EID_RSN:
 820                         elems->rsn = pos;
 821                         elems->rsn_len = elen;
 822                         break;
 823                 case WLAN_EID_ERP_INFO:
 824                         if (elen >= 1)
 825                                 elems->erp_info = pos;
 826                         else
 827                                 elem_parse_failed = true;
 828                         break;
 829                 case WLAN_EID_EXT_SUPP_RATES:
 830                         elems->ext_supp_rates = pos;
 831                         elems->ext_supp_rates_len = elen;
 832                         break;
 833                 case WLAN_EID_HT_CAPABILITY:
 834                         if (elen >= sizeof(struct ieee80211_ht_cap))
 835                                 elems->ht_cap_elem = (void *)pos;
 836                         else
 837                                 elem_parse_failed = true;
 838                         break;
 839                 case WLAN_EID_HT_OPERATION:
 840                         if (elen >= sizeof(struct ieee80211_ht_operation))
 841                                 elems->ht_operation = (void *)pos;
 842                         else
 843                                 elem_parse_failed = true;
 844                         break;
 845                 case WLAN_EID_VHT_CAPABILITY:
 846                         if (elen >= sizeof(struct ieee80211_vht_cap))
 847                                 elems->vht_cap_elem = (void *)pos;
 848                         else
 849                                 elem_parse_failed = true;
 850                         break;
 851                 case WLAN_EID_VHT_OPERATION:
 852                         if (elen >= sizeof(struct ieee80211_vht_operation))
 853                                 elems->vht_operation = (void *)pos;
 854                         else
 855                                 elem_parse_failed = true;
 856                         break;
 857                 case WLAN_EID_OPMODE_NOTIF:
 858                         if (elen > 0)
 859                                 elems->opmode_notif = pos;
 860                         else
 861                                 elem_parse_failed = true;
 862                         break;
 863                 case WLAN_EID_MESH_ID:
 864                         elems->mesh_id = pos;
 865                         elems->mesh_id_len = elen;
 866                         break;
 867                 case WLAN_EID_MESH_CONFIG:
 868                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 869                                 elems->mesh_config = (void *)pos;
 870                         else
 871                                 elem_parse_failed = true;
 872                         break;
 873                 case WLAN_EID_PEER_MGMT:
 874                         elems->peering = pos;
 875                         elems->peering_len = elen;
 876                         break;
 877                 case WLAN_EID_MESH_AWAKE_WINDOW:
 878                         if (elen >= 2)
 879                                 elems->awake_window = (void *)pos;
 880                         break;
 881                 case WLAN_EID_PREQ:
 882                         elems->preq = pos;
 883                         elems->preq_len = elen;
 884                         break;
 885                 case WLAN_EID_PREP:
 886                         elems->prep = pos;
 887                         elems->prep_len = elen;
 888                         break;
 889                 case WLAN_EID_PERR:
 890                         elems->perr = pos;
 891                         elems->perr_len = elen;
 892                         break;
 893                 case WLAN_EID_RANN:
 894                         if (elen >= sizeof(struct ieee80211_rann_ie))
 895                                 elems->rann = (void *)pos;
 896                         else
 897                                 elem_parse_failed = true;
 898                         break;
 899                 case WLAN_EID_CHANNEL_SWITCH:
 900                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 901                                 elem_parse_failed = true;
 902                                 break;
 903                         }
 904                         elems->ch_switch_ie = (void *)pos;
 905                         break;
 906                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 907                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
 908                                 elem_parse_failed = true;
 909                                 break;
 910                         }
 911                         elems->ext_chansw_ie = (void *)pos;
 912                         break;
 913                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 914                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
 915                                 elem_parse_failed = true;
 916                                 break;
 917                         }
 918                         elems->sec_chan_offs = (void *)pos;
 919                         break;
 920                 case WLAN_EID_CHAN_SWITCH_PARAM:
 921                         if (elen !=
 922                             sizeof(*elems->mesh_chansw_params_ie)) {
 923                                 elem_parse_failed = true;
 924                                 break;
 925                         }
 926                         elems->mesh_chansw_params_ie = (void *)pos;
 927                         break;
 928                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 929                         if (!action ||
 930                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
 931                                 elem_parse_failed = true;
 932                                 break;
 933                         }
 934                         elems->wide_bw_chansw_ie = (void *)pos;
 935                         break;
 936                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
 937                         if (action) {
 938                                 elem_parse_failed = true;
 939                                 break;
 940                         }
 941                         /*
 942                          * This is a bit tricky, but as we only care about
 943                          * the wide bandwidth channel switch element, so
 944                          * just parse it out manually.
 945                          */
 946                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
 947                                               pos, elen);
 948                         if (ie) {
 949                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
 950                                         elems->wide_bw_chansw_ie =
 951                                                 (void *)(ie + 2);
 952                                 else
 953                                         elem_parse_failed = true;
 954                         }
 955                         break;
 956                 case WLAN_EID_COUNTRY:
 957                         elems->country_elem = pos;
 958                         elems->country_elem_len = elen;
 959                         break;
 960                 case WLAN_EID_PWR_CONSTRAINT:
 961                         if (elen != 1) {
 962                                 elem_parse_failed = true;
 963                                 break;
 964                         }
 965                         elems->pwr_constr_elem = pos;
 966                         break;
 967                 case WLAN_EID_TIMEOUT_INTERVAL:
 968                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
 969                                 elems->timeout_int = (void *)pos;
 970                         else
 971                                 elem_parse_failed = true;
 972                         break;
 973                 default:
 974                         break;
 975                 }
 976
 977                 if (elem_parse_failed)
 978                         elems->parse_error = true;
 979                 else
 980                         __set_bit(id, seen_elems);
 981
 982                 left -= elen;
 983                 pos += elen;
 984         }
 985
 986         if (left != 0)
 987                 elems->parse_error = true;
 988
 989         return crc;
 990 }
 991
 992 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 993                                bool bss_notify)
 994 {
 995         struct ieee80211_local *local = sdata->local;
 996         struct ieee80211_tx_queue_params qparam;
 997         struct ieee80211_chanctx_conf *chanctx_conf;
 998         int ac;
 999         bool use_11b, enable_qos;
1000         int aCWmin, aCWmax;
1001
1002         if (!local->ops->conf_tx)
1003                 return;
1004
1005         if (local->hw.queues < IEEE80211_NUM_ACS)
1006                 return;
1007
1008         memset(&qparam, 0, sizeof(qparam));
1009
1010         rcu_read_lock();
1011         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1012         use_11b = (chanctx_conf &&
1013                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1014                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1015         rcu_read_unlock();
1016
1017         /*
1018          * By default disable QoS in STA mode for old access points, which do
1019          * not support 802.11e. New APs will provide proper queue parameters,
1020          * that we will configure later.
1021          */
1022         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
1023
1024         /* Set defaults according to 802.11-2007 Table 7-37 */
1025         aCWmax = 1023;
1026         if (use_11b)
1027                 aCWmin = 31;
1028         else
1029                 aCWmin = 15;
1030
1031         /* Confiure old 802.11b/g medium access rules. */
1032         qparam.cw_max = aCWmax;
1033         qparam.cw_min = aCWmin;
1034         qparam.txop = 0;
1035         qparam.aifs = 2;
1036
1037         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1038                 /* Update if QoS is enabled. */
1039                 if (enable_qos) {
1040                         switch (ac) {
1041                         case IEEE80211_AC_BK:
1042                                 qparam.cw_max = aCWmax;
1043                                 qparam.cw_min = aCWmin;
1044                                 qparam.txop = 0;
1045                                 qparam.aifs = 7;
1046                                 break;
1047                         /* never happens but let's not leave undefined */
1048                         default:
1049                         case IEEE80211_AC_BE:
1050                                 qparam.cw_max = aCWmax;
1051                                 qparam.cw_min = aCWmin;
1052                                 qparam.txop = 0;
1053                                 qparam.aifs = 3;
1054                                 break;
1055                         case IEEE80211_AC_VI:
1056                                 qparam.cw_max = aCWmin;
1057                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1058                                 if (use_11b)
1059                                         qparam.txop = 6016/32;
1060                                 else
1061                                         qparam.txop = 3008/32;
1062                                 qparam.aifs = 2;
1063                                 break;
1064                         case IEEE80211_AC_VO:
1065                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1066                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1067                                 if (use_11b)
1068                                         qparam.txop = 3264/32;
1069                                 else
1070                                         qparam.txop = 1504/32;
1071                                 qparam.aifs = 2;
1072                                 break;
1073                         }
1074                 }
1075
1076                 qparam.uapsd = false;
1077
1078                 sdata->tx_conf[ac] = qparam;
1079                 drv_conf_tx(local, sdata, ac, &qparam);
1080         }
1081
1082         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1083             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1084                 sdata->vif.bss_conf.qos = enable_qos;
1085                 if (bss_notify)
1086                         ieee80211_bss_info_change_notify(sdata,
1087                                                          BSS_CHANGED_QOS);
1088         }
1089 }
1090
1091 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1092                          u16 transaction, u16 auth_alg, u16 status,
1093                          const u8 *extra, size_t extra_len, const u8 *da,
1094                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1095                          u32 tx_flags)
1096 {
1097         struct ieee80211_local *local = sdata->local;
1098         struct sk_buff *skb;
1099         struct ieee80211_mgmt *mgmt;
1100         int err;
1101
1102         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1103         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24 + 6 + extra_len);
1104         if (!skb)
1105                 return;
1106
1107         skb_reserve(skb, local->hw.extra_tx_headroom);
1108
1109         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1110         memset(mgmt, 0, 24 + 6);
1111         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1112                                           IEEE80211_STYPE_AUTH);
1113         memcpy(mgmt->da, da, ETH_ALEN);
1114         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1115         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1116         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1117         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1118         mgmt->u.auth.status_code = cpu_to_le16(status);
1119         if (extra)
1120                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1121
1122         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1123                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1124                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1125                 WARN_ON(err);
1126         }
1127
1128         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1129                                         tx_flags;
1130         ieee80211_tx_skb(sdata, skb);
1131 }
1132
1133 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1134                                     const u8 *bssid, u16 stype, u16 reason,
1135                                     bool send_frame, u8 *frame_buf)
1136 {
1137         struct ieee80211_local *local = sdata->local;
1138         struct sk_buff *skb;
1139         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1140
1141         /* build frame */
1142         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1143         mgmt->duration = 0; /* initialize only */
1144         mgmt->seq_ctrl = 0; /* initialize only */
1145         memcpy(mgmt->da, bssid, ETH_ALEN);
1146         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1147         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1148         /* u.deauth.reason_code == u.disassoc.reason_code */
1149         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1150
1151         if (send_frame) {
1152                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1153                                     IEEE80211_DEAUTH_FRAME_LEN);
1154                 if (!skb)
1155                         return;
1156
1157                 skb_reserve(skb, local->hw.extra_tx_headroom);
1158
1159                 /* copy in frame */
1160                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1161                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1162
1163                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1164                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1165                         IEEE80211_SKB_CB(skb)->flags |=
1166                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1167
1168                 ieee80211_tx_skb(sdata, skb);
1169         }
1170 }
1171
1172 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1173                              size_t buffer_len, const u8 *ie, size_t ie_len,
1174                              enum ieee80211_band band, u32 rate_mask,
1175                              struct cfg80211_chan_def *chandef)
1176 {
1177         struct ieee80211_supported_band *sband;
1178         u8 *pos = buffer, *end = buffer + buffer_len;
1179         size_t offset = 0, noffset;
1180         int supp_rates_len, i;
1181         u8 rates[32];
1182         int num_rates;
1183         int ext_rates_len;
1184         int shift;
1185         u32 rate_flags;
1186
1187         sband = local->hw.wiphy->bands[band];
1188         if (WARN_ON_ONCE(!sband))
1189                 return 0;
1190
1191         rate_flags = ieee80211_chandef_rate_flags(chandef);
1192         shift = ieee80211_chandef_get_shift(chandef);
1193
1194         num_rates = 0;
1195         for (i = 0; i < sband->n_bitrates; i++) {
1196                 if ((BIT(i) & rate_mask) == 0)
1197                         continue; /* skip rate */
1198                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1199                         continue;
1200
1201                 rates[num_rates++] =
1202                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1203                                           (1 << shift) * 5);
1204         }
1205
1206         supp_rates_len = min_t(int, num_rates, 8);
1207
1208         if (end - pos < 2 + supp_rates_len)
1209                 goto out_err;
1210         *pos++ = WLAN_EID_SUPP_RATES;
1211         *pos++ = supp_rates_len;
1212         memcpy(pos, rates, supp_rates_len);
1213         pos += supp_rates_len;
1214
1215         /* insert "request information" if in custom IEs */
1216         if (ie && ie_len) {
1217                 static const u8 before_extrates[] = {
1218                         WLAN_EID_SSID,
1219                         WLAN_EID_SUPP_RATES,
1220                         WLAN_EID_REQUEST,
1221                 };
1222                 noffset = ieee80211_ie_split(ie, ie_len,
1223                                              before_extrates,
1224                                              ARRAY_SIZE(before_extrates),
1225                                              offset);
1226                 if (end - pos < noffset - offset)
1227                         goto out_err;
1228                 memcpy(pos, ie + offset, noffset - offset);
1229                 pos += noffset - offset;
1230                 offset = noffset;
1231         }
1232
1233         ext_rates_len = num_rates - supp_rates_len;
1234         if (ext_rates_len > 0) {
1235                 if (end - pos < 2 + ext_rates_len)
1236                         goto out_err;
1237                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1238                 *pos++ = ext_rates_len;
1239                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1240                 pos += ext_rates_len;
1241         }
1242
1243         if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1244                 if (end - pos < 3)
1245                         goto out_err;
1246                 *pos++ = WLAN_EID_DS_PARAMS;
1247                 *pos++ = 1;
1248                 *pos++ = ieee80211_frequency_to_channel(
1249                                 chandef->chan->center_freq);
1250         }
1251
1252         /* insert custom IEs that go before HT */
1253         if (ie && ie_len) {
1254                 static const u8 before_ht[] = {
1255                         WLAN_EID_SSID,
1256                         WLAN_EID_SUPP_RATES,
1257                         WLAN_EID_REQUEST,
1258                         WLAN_EID_EXT_SUPP_RATES,
1259                         WLAN_EID_DS_PARAMS,
1260                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1261                 };
1262                 noffset = ieee80211_ie_split(ie, ie_len,
1263                                              before_ht, ARRAY_SIZE(before_ht),
1264                                              offset);
1265                 if (end - pos < noffset - offset)
1266                         goto out_err;
1267                 memcpy(pos, ie + offset, noffset - offset);
1268                 pos += noffset - offset;
1269                 offset = noffset;
1270         }
1271
1272         if (sband->ht_cap.ht_supported) {
1273                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1274                         goto out_err;
1275                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1276                                                 sband->ht_cap.cap);
1277         }
1278
1279         /*
1280          * If adding more here, adjust code in main.c
1281          * that calculates local->scan_ies_len.
1282          */
1283
1284         /* insert custom IEs that go before VHT */
1285         if (ie && ie_len) {
1286                 static const u8 before_vht[] = {
1287                         WLAN_EID_SSID,
1288                         WLAN_EID_SUPP_RATES,
1289                         WLAN_EID_REQUEST,
1290                         WLAN_EID_EXT_SUPP_RATES,
1291                         WLAN_EID_DS_PARAMS,
1292                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1293                         WLAN_EID_HT_CAPABILITY,
1294                         WLAN_EID_BSS_COEX_2040,
1295                         WLAN_EID_EXT_CAPABILITY,
1296                         WLAN_EID_SSID_LIST,
1297                         WLAN_EID_CHANNEL_USAGE,
1298                         WLAN_EID_INTERWORKING,
1299                         /* mesh ID can't happen here */
1300                         /* 60 GHz can't happen here right now */
1301                 };
1302                 noffset = ieee80211_ie_split(ie, ie_len,
1303                                              before_vht, ARRAY_SIZE(before_vht),
1304                                              offset);
1305                 if (end - pos < noffset - offset)
1306                         goto out_err;
1307                 memcpy(pos, ie + offset, noffset - offset);
1308                 pos += noffset - offset;
1309                 offset = noffset;
1310         }
1311
1312         if (sband->vht_cap.vht_supported) {
1313                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1314                         goto out_err;
1315                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1316                                                  sband->vht_cap.cap);
1317         }
1318
1319         /* add any remaining custom IEs */
1320         if (ie && ie_len) {
1321                 noffset = ie_len;
1322                 if (end - pos < noffset - offset)
1323                         goto out_err;
1324                 memcpy(pos, ie + offset, noffset - offset);
1325                 pos += noffset - offset;
1326         }
1327
1328         return pos - buffer;
1329  out_err:
1330         WARN_ONCE(1, "not enough space for preq IEs\n");
1331         return pos - buffer;
1332 }
1333
1334 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1335                                           u8 *dst, u32 ratemask,
1336                                           struct ieee80211_channel *chan,
1337                                           const u8 *ssid, size_t ssid_len,
1338                                           const u8 *ie, size_t ie_len,
1339                                           bool directed)
1340 {
1341         struct ieee80211_local *local = sdata->local;
1342         struct cfg80211_chan_def chandef;
1343         struct sk_buff *skb;
1344         struct ieee80211_mgmt *mgmt;
1345         int ies_len;
1346
1347         /*
1348          * Do not send DS Channel parameter for directed probe requests
1349          * in order to maximize the chance that we get a response.  Some
1350          * badly-behaved APs don't respond when this parameter is included.
1351          */
1352         chandef.width = sdata->vif.bss_conf.chandef.width;
1353         if (directed)
1354                 chandef.chan = NULL;
1355         else
1356                 chandef.chan = chan;
1357
1358         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1359                                      ssid, ssid_len, 100 + ie_len);
1360         if (!skb)
1361                 return NULL;
1362
1363         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1364                                            skb_tailroom(skb),
1365                                            ie, ie_len, chan->band,
1366                                            ratemask, &chandef);
1367         skb_put(skb, ies_len);
1368
1369         if (dst) {
1370                 mgmt = (struct ieee80211_mgmt *) skb->data;
1371                 memcpy(mgmt->da, dst, ETH_ALEN);
1372                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1373         }
1374
1375         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1376
1377         return skb;
1378 }
1379
1380 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1381                               const u8 *ssid, size_t ssid_len,
1382                               const u8 *ie, size_t ie_len,
1383                               u32 ratemask, bool directed, u32 tx_flags,
1384                               struct ieee80211_channel *channel, bool scan)
1385 {
1386         struct sk_buff *skb;
1387
1388         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1389                                         ssid, ssid_len,
1390                                         ie, ie_len, directed);
1391         if (skb) {
1392                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1393                 if (scan)
1394                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1395                 else
1396                         ieee80211_tx_skb(sdata, skb);
1397         }
1398 }
1399
1400 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1401                             struct ieee802_11_elems *elems,
1402                             enum ieee80211_band band, u32 *basic_rates)
1403 {
1404         struct ieee80211_supported_band *sband;
1405         size_t num_rates;
1406         u32 supp_rates, rate_flags;
1407         int i, j, shift;
1408         sband = sdata->local->hw.wiphy->bands[band];
1409
1410         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1411         shift = ieee80211_vif_get_shift(&sdata->vif);
1412
1413         if (WARN_ON(!sband))
1414                 return 1;
1415
1416         num_rates = sband->n_bitrates;
1417         supp_rates = 0;
1418         for (i = 0; i < elems->supp_rates_len +
1419                      elems->ext_supp_rates_len; i++) {
1420                 u8 rate = 0;
1421                 int own_rate;
1422                 bool is_basic;
1423                 if (i < elems->supp_rates_len)
1424                         rate = elems->supp_rates[i];
1425                 else if (elems->ext_supp_rates)
1426                         rate = elems->ext_supp_rates
1427                                 [i - elems->supp_rates_len];
1428                 own_rate = 5 * (rate & 0x7f);
1429                 is_basic = !!(rate & 0x80);
1430
1431                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1432                         continue;
1433
1434                 for (j = 0; j < num_rates; j++) {
1435                         int brate;
1436                         if ((rate_flags & sband->bitrates[j].flags)
1437                             != rate_flags)
1438                                 continue;
1439
1440                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1441                                              1 << shift);
1442
1443                         if (brate == own_rate) {
1444                                 supp_rates |= BIT(j);
1445                                 if (basic_rates && is_basic)
1446                                         *basic_rates |= BIT(j);
1447                         }
1448                 }
1449         }
1450         return supp_rates;
1451 }
1452
1453 void ieee80211_stop_device(struct ieee80211_local *local)
1454 {
1455         ieee80211_led_radio(local, false);
1456         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1457
1458         cancel_work_sync(&local->reconfig_filter);
1459
1460         flush_workqueue(local->workqueue);
1461         drv_stop(local);
1462 }
1463
1464 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1465                                      struct ieee80211_sub_if_data *sdata)
1466 {
1467         struct ieee80211_chanctx_conf *conf;
1468         struct ieee80211_chanctx *ctx;
1469
1470         if (!local->use_chanctx)
1471                 return;
1472
1473         mutex_lock(&local->chanctx_mtx);
1474         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1475                                          lockdep_is_held(&local->chanctx_mtx));
1476         if (conf) {
1477                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1478                 drv_assign_vif_chanctx(local, sdata, ctx);
1479         }
1480         mutex_unlock(&local->chanctx_mtx);
1481 }
1482
1483 int ieee80211_reconfig(struct ieee80211_local *local)
1484 {
1485         struct ieee80211_hw *hw = &local->hw;
1486         struct ieee80211_sub_if_data *sdata;
1487         struct ieee80211_chanctx *ctx;
1488         struct sta_info *sta;
1489         int res, i;
1490         bool reconfig_due_to_wowlan = false;
1491         struct ieee80211_sub_if_data *sched_scan_sdata;
1492         bool sched_scan_stopped = false;
1493
1494 #ifdef CONFIG_PM
1495         if (local->suspended)
1496                 local->resuming = true;
1497
1498         if (local->wowlan) {
1499                 res = drv_resume(local);
1500                 local->wowlan = false;
1501                 if (res < 0) {
1502                         local->resuming = false;
1503                         return res;
1504                 }
1505                 if (res == 0)
1506                         goto wake_up;
1507                 WARN_ON(res > 1);
1508                 /*
1509                  * res is 1, which means the driver requested
1510                  * to go through a regular reset on wakeup.
1511                  */
1512                 reconfig_due_to_wowlan = true;
1513         }
1514 #endif
1515         /* everything else happens only if HW was up & running */
1516         if (!local->open_count)
1517                 goto wake_up;
1518
1519         /*
1520          * Upon resume hardware can sometimes be goofy due to
1521          * various platform / driver / bus issues, so restarting
1522          * the device may at times not work immediately. Propagate
1523          * the error.
1524          */
1525         res = drv_start(local);
1526         if (res) {
1527                 WARN(local->suspended, "Hardware became unavailable "
1528                      "upon resume. This could be a software issue "
1529                      "prior to suspend or a hardware issue.\n");
1530                 return res;
1531         }
1532
1533         /* setup fragmentation threshold */
1534         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1535
1536         /* setup RTS threshold */
1537         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1538
1539         /* reset coverage class */
1540         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1541
1542         ieee80211_led_radio(local, true);
1543         ieee80211_mod_tpt_led_trig(local,
1544                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1545
1546         /* add interfaces */
1547         sdata = rtnl_dereference(local->monitor_sdata);
1548         if (sdata) {
1549                 /* in HW restart it exists already */
1550                 WARN_ON(local->resuming);
1551                 res = drv_add_interface(local, sdata);
1552                 if (WARN_ON(res)) {
1553                         rcu_assign_pointer(local->monitor_sdata, NULL);
1554                         synchronize_net();
1555                         kfree(sdata);
1556                 }
1557         }
1558
1559         list_for_each_entry(sdata, &local->interfaces, list) {
1560                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1561                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1562                     ieee80211_sdata_running(sdata))
1563                         res = drv_add_interface(local, sdata);
1564         }
1565
1566         /* add channel contexts */
1567         if (local->use_chanctx) {
1568                 mutex_lock(&local->chanctx_mtx);
1569                 list_for_each_entry(ctx, &local->chanctx_list, list)
1570                         WARN_ON(drv_add_chanctx(local, ctx));
1571                 mutex_unlock(&local->chanctx_mtx);
1572         }
1573
1574         list_for_each_entry(sdata, &local->interfaces, list) {
1575                 if (!ieee80211_sdata_running(sdata))
1576                         continue;
1577                 ieee80211_assign_chanctx(local, sdata);
1578         }
1579
1580         sdata = rtnl_dereference(local->monitor_sdata);
1581         if (sdata && ieee80211_sdata_running(sdata))
1582                 ieee80211_assign_chanctx(local, sdata);
1583
1584         /* add STAs back */
1585         mutex_lock(&local->sta_mtx);
1586         list_for_each_entry(sta, &local->sta_list, list) {
1587                 enum ieee80211_sta_state state;
1588
1589                 if (!sta->uploaded)
1590                         continue;
1591
1592                 /* AP-mode stations will be added later */
1593                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1594                         continue;
1595
1596                 for (state = IEEE80211_STA_NOTEXIST;
1597                      state < sta->sta_state; state++)
1598                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1599                                               state + 1));
1600         }
1601         mutex_unlock(&local->sta_mtx);
1602
1603         /* reconfigure tx conf */
1604         if (hw->queues >= IEEE80211_NUM_ACS) {
1605                 list_for_each_entry(sdata, &local->interfaces, list) {
1606                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1607                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1608                             !ieee80211_sdata_running(sdata))
1609                                 continue;
1610
1611                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1612                                 drv_conf_tx(local, sdata, i,
1613                                             &sdata->tx_conf[i]);
1614                 }
1615         }
1616
1617         /* reconfigure hardware */
1618         ieee80211_hw_config(local, ~0);
1619
1620         ieee80211_configure_filter(local);
1621
1622         /* Finally also reconfigure all the BSS information */
1623         list_for_each_entry(sdata, &local->interfaces, list) {
1624                 u32 changed;
1625
1626                 if (!ieee80211_sdata_running(sdata))
1627                         continue;
1628
1629                 /* common change flags for all interface types */
1630                 changed = BSS_CHANGED_ERP_CTS_PROT |
1631                           BSS_CHANGED_ERP_PREAMBLE |
1632                           BSS_CHANGED_ERP_SLOT |
1633                           BSS_CHANGED_HT |
1634                           BSS_CHANGED_BASIC_RATES |
1635                           BSS_CHANGED_BEACON_INT |
1636                           BSS_CHANGED_BSSID |
1637                           BSS_CHANGED_CQM |
1638                           BSS_CHANGED_QOS |
1639                           BSS_CHANGED_IDLE |
1640                           BSS_CHANGED_TXPOWER;
1641
1642                 switch (sdata->vif.type) {
1643                 case NL80211_IFTYPE_STATION:
1644                         changed |= BSS_CHANGED_ASSOC |
1645                                    BSS_CHANGED_ARP_FILTER |
1646                                    BSS_CHANGED_PS;
1647
1648                         /* Re-send beacon info report to the driver */
1649                         if (sdata->u.mgd.have_beacon)
1650                                 changed |= BSS_CHANGED_BEACON_INFO;
1651
1652                         sdata_lock(sdata);
1653                         ieee80211_bss_info_change_notify(sdata, changed);
1654                         sdata_unlock(sdata);
1655                         break;
1656                 case NL80211_IFTYPE_ADHOC:
1657                         changed |= BSS_CHANGED_IBSS;
1658                         /* fall through */
1659                 case NL80211_IFTYPE_AP:
1660                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1661
1662                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1663                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1664
1665                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1666                                         drv_start_ap(local, sdata);
1667                         }
1668
1669                         /* fall through */
1670                 case NL80211_IFTYPE_MESH_POINT:
1671                         if (sdata->vif.bss_conf.enable_beacon) {
1672                                 changed |= BSS_CHANGED_BEACON |
1673                                            BSS_CHANGED_BEACON_ENABLED;
1674                                 ieee80211_bss_info_change_notify(sdata, changed);
1675                         }
1676                         break;
1677                 case NL80211_IFTYPE_WDS:
1678                         break;
1679                 case NL80211_IFTYPE_AP_VLAN:
1680                 case NL80211_IFTYPE_MONITOR:
1681                         /* ignore virtual */
1682                         break;
1683                 case NL80211_IFTYPE_P2P_DEVICE:
1684                         changed = BSS_CHANGED_IDLE;
1685                         break;
1686                 case NL80211_IFTYPE_UNSPECIFIED:
1687                 case NUM_NL80211_IFTYPES:
1688                 case NL80211_IFTYPE_P2P_CLIENT:
1689                 case NL80211_IFTYPE_P2P_GO:
1690                         WARN_ON(1);
1691                         break;
1692                 }
1693         }
1694
1695         ieee80211_recalc_ps(local, -1);
1696
1697         /*
1698          * The sta might be in psm against the ap (e.g. because
1699          * this was the state before a hw restart), so we
1700          * explicitly send a null packet in order to make sure
1701          * it'll sync against the ap (and get out of psm).
1702          */
1703         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1704                 list_for_each_entry(sdata, &local->interfaces, list) {
1705                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1706                                 continue;
1707                         if (!sdata->u.mgd.associated)
1708                                 continue;
1709
1710                         ieee80211_send_nullfunc(local, sdata, 0);
1711                 }
1712         }
1713
1714         /* APs are now beaconing, add back stations */
1715         mutex_lock(&local->sta_mtx);
1716         list_for_each_entry(sta, &local->sta_list, list) {
1717                 enum ieee80211_sta_state state;
1718
1719                 if (!sta->uploaded)
1720                         continue;
1721
1722                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1723                         continue;
1724
1725                 for (state = IEEE80211_STA_NOTEXIST;
1726                      state < sta->sta_state; state++)
1727                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1728                                               state + 1));
1729         }
1730         mutex_unlock(&local->sta_mtx);
1731
1732         /* add back keys */
1733         list_for_each_entry(sdata, &local->interfaces, list)
1734                 if (ieee80211_sdata_running(sdata))
1735                         ieee80211_enable_keys(sdata);
1736
1737  wake_up:
1738         local->in_reconfig = false;
1739         barrier();
1740
1741         if (local->monitors == local->open_count && local->monitors > 0)
1742                 ieee80211_add_virtual_monitor(local);
1743
1744         /*
1745          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1746          * sessions can be established after a resume.
1747          *
1748          * Also tear down aggregation sessions since reconfiguring
1749          * them in a hardware restart scenario is not easily done
1750          * right now, and the hardware will have lost information
1751          * about the sessions, but we and the AP still think they
1752          * are active. This is really a workaround though.
1753          */
1754         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1755                 mutex_lock(&local->sta_mtx);
1756
1757                 list_for_each_entry(sta, &local->sta_list, list) {
1758                         ieee80211_sta_tear_down_BA_sessions(
1759                                         sta, AGG_STOP_LOCAL_REQUEST);
1760                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1761                 }
1762
1763                 mutex_unlock(&local->sta_mtx);
1764         }
1765
1766         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1767                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1768
1769         /*
1770          * If this is for hw restart things are still running.
1771          * We may want to change that later, however.
1772          */
1773         if (!local->suspended || reconfig_due_to_wowlan)
1774                 drv_restart_complete(local);
1775
1776         if (!local->suspended)
1777                 return 0;
1778
1779 #ifdef CONFIG_PM
1780         /* first set suspended false, then resuming */
1781         local->suspended = false;
1782         mb();
1783         local->resuming = false;
1784
1785         list_for_each_entry(sdata, &local->interfaces, list) {
1786                 if (!ieee80211_sdata_running(sdata))
1787                         continue;
1788                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1789                         ieee80211_sta_restart(sdata);
1790         }
1791
1792         mod_timer(&local->sta_cleanup, jiffies + 1);
1793 #else
1794         WARN_ON(1);
1795 #endif
1796
1797         /*
1798          * Reconfigure sched scan if it was interrupted by FW restart or
1799          * suspend.
1800          */
1801         mutex_lock(&local->mtx);
1802         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1803                                                 lockdep_is_held(&local->mtx));
1804         if (sched_scan_sdata && local->sched_scan_req)
1805                 /*
1806                  * Sched scan stopped, but we don't want to report it. Instead,
1807                  * we're trying to reschedule.
1808                  */
1809                 if (__ieee80211_request_sched_scan_start(sched_scan_sdata,
1810                                                          local->sched_scan_req))
1811                         sched_scan_stopped = true;
1812         mutex_unlock(&local->mtx);
1813
1814         if (sched_scan_stopped)
1815                 cfg80211_sched_scan_stopped(local->hw.wiphy);
1816
1817         return 0;
1818 }
1819
1820 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1821 {
1822         struct ieee80211_sub_if_data *sdata;
1823         struct ieee80211_local *local;
1824         struct ieee80211_key *key;
1825
1826         if (WARN_ON(!vif))
1827                 return;
1828
1829         sdata = vif_to_sdata(vif);
1830         local = sdata->local;
1831
1832         if (WARN_ON(!local->resuming))
1833                 return;
1834
1835         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1836                 return;
1837
1838         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1839
1840         mutex_lock(&local->key_mtx);
1841         list_for_each_entry(key, &sdata->key_list, list)
1842                 key->flags |= KEY_FLAG_TAINTED;
1843         mutex_unlock(&local->key_mtx);
1844 }
1845 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1846
1847 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1848 {
1849         struct ieee80211_local *local = sdata->local;
1850         struct ieee80211_chanctx_conf *chanctx_conf;
1851         struct ieee80211_chanctx *chanctx;
1852
1853         mutex_lock(&local->chanctx_mtx);
1854
1855         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1856                                         lockdep_is_held(&local->chanctx_mtx));
1857
1858         if (WARN_ON_ONCE(!chanctx_conf))
1859                 goto unlock;
1860
1861         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1862         ieee80211_recalc_smps_chanctx(local, chanctx);
1863  unlock:
1864         mutex_unlock(&local->chanctx_mtx);
1865 }
1866
1867 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
1868 {
1869         struct ieee80211_local *local = sdata->local;
1870         struct ieee80211_chanctx_conf *chanctx_conf;
1871         struct ieee80211_chanctx *chanctx;
1872
1873         mutex_lock(&local->chanctx_mtx);
1874
1875         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1876                                         lockdep_is_held(&local->chanctx_mtx));
1877
1878         if (WARN_ON_ONCE(!chanctx_conf))
1879                 goto unlock;
1880
1881         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1882         ieee80211_recalc_chanctx_min_def(local, chanctx);
1883  unlock:
1884         mutex_unlock(&local->chanctx_mtx);
1885 }
1886
1887 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1888 {
1889         int i;
1890
1891         for (i = 0; i < n_ids; i++)
1892                 if (ids[i] == id)
1893                         return true;
1894         return false;
1895 }
1896
1897 /**
1898  * ieee80211_ie_split - split an IE buffer according to ordering
1899  *
1900  * @ies: the IE buffer
1901  * @ielen: the length of the IE buffer
1902  * @ids: an array with element IDs that are allowed before
1903  *      the split
1904  * @n_ids: the size of the element ID array
1905  * @offset: offset where to start splitting in the buffer
1906  *
1907  * This function splits an IE buffer by updating the @offset
1908  * variable to point to the location where the buffer should be
1909  * split.
1910  *
1911  * It assumes that the given IE buffer is well-formed, this
1912  * has to be guaranteed by the caller!
1913  *
1914  * It also assumes that the IEs in the buffer are ordered
1915  * correctly, if not the result of using this function will not
1916  * be ordered correctly either, i.e. it does no reordering.
1917  *
1918  * The function returns the offset where the next part of the
1919  * buffer starts, which may be @ielen if the entire (remainder)
1920  * of the buffer should be used.
1921  */
1922 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1923                           const u8 *ids, int n_ids, size_t offset)
1924 {
1925         size_t pos = offset;
1926
1927         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1928                 pos += 2 + ies[pos + 1];
1929
1930         return pos;
1931 }
1932
1933 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1934 {
1935         size_t pos = offset;
1936
1937         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1938                 pos += 2 + ies[pos + 1];
1939
1940         return pos;
1941 }
1942
1943 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1944                                             int rssi_min_thold,
1945                                             int rssi_max_thold)
1946 {
1947         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1948
1949         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1950                 return;
1951
1952         /*
1953          * Scale up threshold values before storing it, as the RSSI averaging
1954          * algorithm uses a scaled up value as well. Change this scaling
1955          * factor if the RSSI averaging algorithm changes.
1956          */
1957         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1958         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1959 }
1960
1961 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1962                                     int rssi_min_thold,
1963                                     int rssi_max_thold)
1964 {
1965         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1966
1967         WARN_ON(rssi_min_thold == rssi_max_thold ||
1968                 rssi_min_thold > rssi_max_thold);
1969
1970         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1971                                        rssi_max_thold);
1972 }
1973 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1974
1975 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1976 {
1977         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1978
1979         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1980 }
1981 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1982
1983 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1984                               u16 cap)
1985 {
1986         __le16 tmp;
1987
1988         *pos++ = WLAN_EID_HT_CAPABILITY;
1989         *pos++ = sizeof(struct ieee80211_ht_cap);
1990         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1991
1992         /* capability flags */
1993         tmp = cpu_to_le16(cap);
1994         memcpy(pos, &tmp, sizeof(u16));
1995         pos += sizeof(u16);
1996
1997         /* AMPDU parameters */
1998         *pos++ = ht_cap->ampdu_factor |
1999                  (ht_cap->ampdu_density <<
2000                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2001
2002         /* MCS set */
2003         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2004         pos += sizeof(ht_cap->mcs);
2005
2006         /* extended capabilities */
2007         pos += sizeof(__le16);
2008
2009         /* BF capabilities */
2010         pos += sizeof(__le32);
2011
2012         /* antenna selection */
2013         pos += sizeof(u8);
2014
2015         return pos;
2016 }
2017
2018 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2019                                u32 cap)
2020 {
2021         __le32 tmp;
2022
2023         *pos++ = WLAN_EID_VHT_CAPABILITY;
2024         *pos++ = sizeof(struct ieee80211_vht_cap);
2025         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2026
2027         /* capability flags */
2028         tmp = cpu_to_le32(cap);
2029         memcpy(pos, &tmp, sizeof(u32));
2030         pos += sizeof(u32);
2031
2032         /* VHT MCS set */
2033         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2034         pos += sizeof(vht_cap->vht_mcs);
2035
2036         return pos;
2037 }
2038
2039 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2040                                const struct cfg80211_chan_def *chandef,
2041                                u16 prot_mode)
2042 {
2043         struct ieee80211_ht_operation *ht_oper;
2044         /* Build HT Information */
2045         *pos++ = WLAN_EID_HT_OPERATION;
2046         *pos++ = sizeof(struct ieee80211_ht_operation);
2047         ht_oper = (struct ieee80211_ht_operation *)pos;
2048         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2049                                         chandef->chan->center_freq);
2050         switch (chandef->width) {
2051         case NL80211_CHAN_WIDTH_160:
2052         case NL80211_CHAN_WIDTH_80P80:
2053         case NL80211_CHAN_WIDTH_80:
2054         case NL80211_CHAN_WIDTH_40:
2055                 if (chandef->center_freq1 > chandef->chan->center_freq)
2056                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2057                 else
2058                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2059                 break;
2060         default:
2061                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2062                 break;
2063         }
2064         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2065             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2066             chandef->width != NL80211_CHAN_WIDTH_20)
2067                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2068
2069         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2070         ht_oper->stbc_param = 0x0000;
2071
2072         /* It seems that Basic MCS set and Supported MCS set
2073            are identical for the first 10 bytes */
2074         memset(&ht_oper->basic_set, 0, 16);
2075         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2076
2077         return pos + sizeof(struct ieee80211_ht_operation);
2078 }
2079
2080 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2081                                   const struct ieee80211_ht_operation *ht_oper,
2082                                   struct cfg80211_chan_def *chandef)
2083 {
2084         enum nl80211_channel_type channel_type;
2085
2086         if (!ht_oper) {
2087                 cfg80211_chandef_create(chandef, control_chan,
2088                                         NL80211_CHAN_NO_HT);
2089                 return;
2090         }
2091
2092         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2093         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2094                 channel_type = NL80211_CHAN_HT20;
2095                 break;
2096         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2097                 channel_type = NL80211_CHAN_HT40PLUS;
2098                 break;
2099         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2100                 channel_type = NL80211_CHAN_HT40MINUS;
2101                 break;
2102         default:
2103                 channel_type = NL80211_CHAN_NO_HT;
2104         }
2105
2106         cfg80211_chandef_create(chandef, control_chan, channel_type);
2107 }
2108
2109 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2110                              const struct ieee80211_supported_band *sband,
2111                              const u8 *srates, int srates_len, u32 *rates)
2112 {
2113         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2114         int shift = ieee80211_chandef_get_shift(chandef);
2115         struct ieee80211_rate *br;
2116         int brate, rate, i, j, count = 0;
2117
2118         *rates = 0;
2119
2120         for (i = 0; i < srates_len; i++) {
2121                 rate = srates[i] & 0x7f;
2122
2123                 for (j = 0; j < sband->n_bitrates; j++) {
2124                         br = &sband->bitrates[j];
2125                         if ((rate_flags & br->flags) != rate_flags)
2126                                 continue;
2127
2128                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2129                         if (brate == rate) {
2130                                 *rates |= BIT(j);
2131                                 count++;
2132                                 break;
2133                         }
2134                 }
2135         }
2136         return count;
2137 }
2138
2139 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2140                             struct sk_buff *skb, bool need_basic,
2141                             enum ieee80211_band band)
2142 {
2143         struct ieee80211_local *local = sdata->local;
2144         struct ieee80211_supported_band *sband;
2145         int rate, shift;
2146         u8 i, rates, *pos;
2147         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2148         u32 rate_flags;
2149
2150         shift = ieee80211_vif_get_shift(&sdata->vif);
2151         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2152         sband = local->hw.wiphy->bands[band];
2153         rates = 0;
2154         for (i = 0; i < sband->n_bitrates; i++) {
2155                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2156                         continue;
2157                 rates++;
2158         }
2159         if (rates > 8)
2160                 rates = 8;
2161
2162         if (skb_tailroom(skb) < rates + 2)
2163                 return -ENOMEM;
2164
2165         pos = skb_put(skb, rates + 2);
2166         *pos++ = WLAN_EID_SUPP_RATES;
2167         *pos++ = rates;
2168         for (i = 0; i < rates; i++) {
2169                 u8 basic = 0;
2170                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2171                         continue;
2172
2173                 if (need_basic && basic_rates & BIT(i))
2174                         basic = 0x80;
2175                 rate = sband->bitrates[i].bitrate;
2176                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2177                                     5 * (1 << shift));
2178                 *pos++ = basic | (u8) rate;
2179         }
2180
2181         return 0;
2182 }
2183
2184 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2185                                 struct sk_buff *skb, bool need_basic,
2186                                 enum ieee80211_band band)
2187 {
2188         struct ieee80211_local *local = sdata->local;
2189         struct ieee80211_supported_band *sband;
2190         int rate, shift;
2191         u8 i, exrates, *pos;
2192         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2193         u32 rate_flags;
2194
2195         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2196         shift = ieee80211_vif_get_shift(&sdata->vif);
2197
2198         sband = local->hw.wiphy->bands[band];
2199         exrates = 0;
2200         for (i = 0; i < sband->n_bitrates; i++) {
2201                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2202                         continue;
2203                 exrates++;
2204         }
2205
2206         if (exrates > 8)
2207                 exrates -= 8;
2208         else
2209                 exrates = 0;
2210
2211         if (skb_tailroom(skb) < exrates + 2)
2212                 return -ENOMEM;
2213
2214         if (exrates) {
2215                 pos = skb_put(skb, exrates + 2);
2216                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2217                 *pos++ = exrates;
2218                 for (i = 8; i < sband->n_bitrates; i++) {
2219                         u8 basic = 0;
2220                         if ((rate_flags & sband->bitrates[i].flags)
2221                             != rate_flags)
2222                                 continue;
2223                         if (need_basic && basic_rates & BIT(i))
2224                                 basic = 0x80;
2225                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2226                                             5 * (1 << shift));
2227                         *pos++ = basic | (u8) rate;
2228                 }
2229         }
2230         return 0;
2231 }
2232
2233 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2234 {
2235         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2236         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2237
2238         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2239                 /* non-managed type inferfaces */
2240                 return 0;
2241         }
2242         return ifmgd->ave_beacon_signal / 16;
2243 }
2244 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2245
2246 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2247 {
2248         if (!mcs)
2249                 return 1;
2250
2251         /* TODO: consider rx_highest */
2252
2253         if (mcs->rx_mask[3])
2254                 return 4;
2255         if (mcs->rx_mask[2])
2256                 return 3;
2257         if (mcs->rx_mask[1])
2258                 return 2;
2259         return 1;
2260 }
2261
2262 /**
2263  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2264  * @local: mac80211 hw info struct
2265  * @status: RX status
2266  * @mpdu_len: total MPDU length (including FCS)
2267  * @mpdu_offset: offset into MPDU to calculate timestamp at
2268  *
2269  * This function calculates the RX timestamp at the given MPDU offset, taking
2270  * into account what the RX timestamp was. An offset of 0 will just normalize
2271  * the timestamp to TSF at beginning of MPDU reception.
2272  */
2273 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2274                                      struct ieee80211_rx_status *status,
2275                                      unsigned int mpdu_len,
2276                                      unsigned int mpdu_offset)
2277 {
2278         u64 ts = status->mactime;
2279         struct rate_info ri;
2280         u16 rate;
2281
2282         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2283                 return 0;
2284
2285         memset(&ri, 0, sizeof(ri));
2286
2287         /* Fill cfg80211 rate info */
2288         if (status->flag & RX_FLAG_HT) {
2289                 ri.mcs = status->rate_idx;
2290                 ri.flags |= RATE_INFO_FLAGS_MCS;
2291                 if (status->flag & RX_FLAG_40MHZ)
2292                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2293                 if (status->flag & RX_FLAG_SHORT_GI)
2294                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2295         } else if (status->flag & RX_FLAG_VHT) {
2296                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2297                 ri.mcs = status->rate_idx;
2298                 ri.nss = status->vht_nss;
2299                 if (status->flag & RX_FLAG_40MHZ)
2300                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2301                 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2302                         ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2303                 if (status->vht_flag & RX_VHT_FLAG_80P80MHZ)
2304                         ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2305                 if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2306                         ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2307                 if (status->flag & RX_FLAG_SHORT_GI)
2308                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2309         } else {
2310                 struct ieee80211_supported_band *sband;
2311                 int shift = 0;
2312                 int bitrate;
2313
2314                 if (status->flag & RX_FLAG_10MHZ)
2315                         shift = 1;
2316                 if (status->flag & RX_FLAG_5MHZ)
2317                         shift = 2;
2318
2319                 sband = local->hw.wiphy->bands[status->band];
2320                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2321                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2322         }
2323
2324         rate = cfg80211_calculate_bitrate(&ri);
2325         if (WARN_ONCE(!rate,
2326                       "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2327                       status->flag, status->rate_idx, status->vht_nss))
2328                 return 0;
2329
2330         /* rewind from end of MPDU */
2331         if (status->flag & RX_FLAG_MACTIME_END)
2332                 ts -= mpdu_len * 8 * 10 / rate;
2333
2334         ts += mpdu_offset * 8 * 10 / rate;
2335
2336         return ts;
2337 }
2338
2339 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2340 {
2341         struct ieee80211_sub_if_data *sdata;
2342         struct cfg80211_chan_def chandef;
2343
2344         mutex_lock(&local->mtx);
2345         mutex_lock(&local->iflist_mtx);
2346         list_for_each_entry(sdata, &local->interfaces, list) {
2347                 /* it might be waiting for the local->mtx, but then
2348                  * by the time it gets it, sdata->wdev.cac_started
2349                  * will no longer be true
2350                  */
2351                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2352
2353                 if (sdata->wdev.cac_started) {
2354                         chandef = sdata->vif.bss_conf.chandef;
2355                         ieee80211_vif_release_channel(sdata);
2356                         cfg80211_cac_event(sdata->dev,
2357                                            &chandef,
2358                                            NL80211_RADAR_CAC_ABORTED,
2359                                            GFP_KERNEL);
2360                 }
2361         }
2362         mutex_unlock(&local->iflist_mtx);
2363         mutex_unlock(&local->mtx);
2364 }
2365
2366 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2367 {
2368         struct ieee80211_local *local =
2369                 container_of(work, struct ieee80211_local, radar_detected_work);
2370         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2371
2372         ieee80211_dfs_cac_cancel(local);
2373
2374         if (local->use_chanctx)
2375                 /* currently not handled */
2376                 WARN_ON(1);
2377         else
2378                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2379 }
2380
2381 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2382 {
2383         struct ieee80211_local *local = hw_to_local(hw);
2384
2385         trace_api_radar_detected(local);
2386
2387         ieee80211_queue_work(hw, &local->radar_detected_work);
2388 }
2389 EXPORT_SYMBOL(ieee80211_radar_detected);
2390
2391 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2392 {
2393         u32 ret;
2394         int tmp;
2395
2396         switch (c->width) {
2397         case NL80211_CHAN_WIDTH_20:
2398                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2399                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2400                 break;
2401         case NL80211_CHAN_WIDTH_40:
2402                 c->width = NL80211_CHAN_WIDTH_20;
2403                 c->center_freq1 = c->chan->center_freq;
2404                 ret = IEEE80211_STA_DISABLE_40MHZ |
2405                       IEEE80211_STA_DISABLE_VHT;
2406                 break;
2407         case NL80211_CHAN_WIDTH_80:
2408                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2409                 /* n_P40 */
2410                 tmp /= 2;
2411                 /* freq_P40 */
2412                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2413                 c->width = NL80211_CHAN_WIDTH_40;
2414                 ret = IEEE80211_STA_DISABLE_VHT;
2415                 break;
2416         case NL80211_CHAN_WIDTH_80P80:
2417                 c->center_freq2 = 0;
2418                 c->width = NL80211_CHAN_WIDTH_80;
2419                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2420                       IEEE80211_STA_DISABLE_160MHZ;
2421                 break;
2422         case NL80211_CHAN_WIDTH_160:
2423                 /* n_P20 */
2424                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2425                 /* n_P80 */
2426                 tmp /= 4;
2427                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2428                 c->width = NL80211_CHAN_WIDTH_80;
2429                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2430                       IEEE80211_STA_DISABLE_160MHZ;
2431                 break;
2432         default:
2433         case NL80211_CHAN_WIDTH_20_NOHT:
2434                 WARN_ON_ONCE(1);
2435                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2436                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2437                 break;
2438         case NL80211_CHAN_WIDTH_5:
2439         case NL80211_CHAN_WIDTH_10:
2440                 WARN_ON_ONCE(1);
2441                 /* keep c->width */
2442                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2443                 break;
2444         }
2445
2446         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2447
2448         return ret;
2449 }
2450
2451 /*
2452  * Returns true if smps_mode_new is strictly more restrictive than
2453  * smps_mode_old.
2454  */
2455 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2456                                    enum ieee80211_smps_mode smps_mode_new)
2457 {
2458         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2459                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2460                 return false;
2461
2462         switch (smps_mode_old) {
2463         case IEEE80211_SMPS_STATIC:
2464                 return false;
2465         case IEEE80211_SMPS_DYNAMIC:
2466                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2467         case IEEE80211_SMPS_OFF:
2468                 return smps_mode_new != IEEE80211_SMPS_OFF;
2469         default:
2470                 WARN_ON(1);
2471         }
2472
2473         return false;
2474 }
2475
2476 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2477                               struct cfg80211_csa_settings *csa_settings)
2478 {
2479         struct sk_buff *skb;
2480         struct ieee80211_mgmt *mgmt;
2481         struct ieee80211_local *local = sdata->local;
2482         int freq;
2483         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2484                                sizeof(mgmt->u.action.u.chan_switch);
2485         u8 *pos;
2486
2487         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2488             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2489                 return -EOPNOTSUPP;
2490
2491         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2492                             5 + /* channel switch announcement element */
2493                             3 + /* secondary channel offset element */
2494                             8); /* mesh channel switch parameters element */
2495         if (!skb)
2496                 return -ENOMEM;
2497
2498         skb_reserve(skb, local->tx_headroom);
2499         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2500         memset(mgmt, 0, hdr_len);
2501         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2502                                           IEEE80211_STYPE_ACTION);
2503
2504         eth_broadcast_addr(mgmt->da);
2505         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2506         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2507                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2508         } else {
2509                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2510                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2511         }
2512         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2513         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2514         pos = skb_put(skb, 5);
2515         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
2516         *pos++ = 3;                                             /* IE length */
2517         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
2518         freq = csa_settings->chandef.chan->center_freq;
2519         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
2520         *pos++ = csa_settings->count;                           /* count */
2521
2522         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2523                 enum nl80211_channel_type ch_type;
2524
2525                 skb_put(skb, 3);
2526                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
2527                 *pos++ = 1;                                     /* IE length */
2528                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2529                 if (ch_type == NL80211_CHAN_HT40PLUS)
2530                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2531                 else
2532                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2533         }
2534
2535         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2536                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2537
2538                 skb_put(skb, 8);
2539                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
2540                 *pos++ = 6;                                     /* IE length */
2541                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
2542                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
2543                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2544                 *pos++ |= csa_settings->block_tx ?
2545                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2546                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2547                 pos += 2;
2548                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2549                 pos += 2;
2550         }
2551
2552         ieee80211_tx_skb(sdata, skb);
2553         return 0;
2554 }
2555
2556 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2557 {
2558         return !(cs == NULL || cs->cipher == 0 ||
2559                  cs->hdr_len < cs->pn_len + cs->pn_off ||
2560                  cs->hdr_len <= cs->key_idx_off ||
2561                  cs->key_idx_shift > 7 ||
2562                  cs->key_idx_mask == 0);
2563 }
2564
2565 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2566 {
2567         int i;
2568
2569         /* Ensure we have enough iftype bitmap space for all iftype values */
2570         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2571
2572         for (i = 0; i < n; i++)
2573                 if (!ieee80211_cs_valid(&cs[i]))
2574                         return false;
2575
2576         return true;
2577 }
2578
2579 const struct ieee80211_cipher_scheme *
2580 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2581                  enum nl80211_iftype iftype)
2582 {
2583         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2584         int n = local->hw.n_cipher_schemes;
2585         int i;
2586         const struct ieee80211_cipher_scheme *cs = NULL;
2587
2588         for (i = 0; i < n; i++) {
2589                 if (l[i].cipher == cipher) {
2590                         cs = &l[i];
2591                         break;
2592                 }
2593         }
2594
2595         if (!cs || !(cs->iftype & BIT(iftype)))
2596                 return NULL;
2597
2598         return cs;
2599 }
2600
2601 int ieee80211_cs_headroom(struct ieee80211_local *local,
2602                           struct cfg80211_crypto_settings *crypto,
2603                           enum nl80211_iftype iftype)
2604 {
2605         const struct ieee80211_cipher_scheme *cs;
2606         int headroom = IEEE80211_ENCRYPT_HEADROOM;
2607         int i;
2608
2609         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
2610                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
2611                                       iftype);
2612
2613                 if (cs && headroom < cs->hdr_len)
2614                         headroom = cs->hdr_len;
2615         }
2616
2617         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
2618         if (cs && headroom < cs->hdr_len)
2619                 headroom = cs->hdr_len;
2620
2621         return headroom;
2622 }
2623
2624 static bool
2625 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
2626 {
2627         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
2628         int skip;
2629
2630         if (end > 0)
2631                 return false;
2632
2633         /* End time is in the past, check for repetitions */
2634         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
2635         if (data->count[i] < 255) {
2636                 if (data->count[i] <= skip) {
2637                         data->count[i] = 0;
2638                         return false;
2639                 }
2640
2641                 data->count[i] -= skip;
2642         }
2643
2644         data->desc[i].start += skip * data->desc[i].interval;
2645
2646         return true;
2647 }
2648
2649 static bool
2650 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
2651                              s32 *offset)
2652 {
2653         bool ret = false;
2654         int i;
2655
2656         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2657                 s32 cur;
2658
2659                 if (!data->count[i])
2660                         continue;
2661
2662                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
2663                         ret = true;
2664
2665                 cur = data->desc[i].start - tsf;
2666                 if (cur > *offset)
2667                         continue;
2668
2669                 cur = data->desc[i].start + data->desc[i].duration - tsf;
2670                 if (cur > *offset)
2671                         *offset = cur;
2672         }
2673
2674         return ret;
2675 }
2676
2677 static u32
2678 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
2679 {
2680         s32 offset = 0;
2681         int tries = 0;
2682         /*
2683          * arbitrary limit, used to avoid infinite loops when combined NoA
2684          * descriptors cover the full time period.
2685          */
2686         int max_tries = 5;
2687
2688         ieee80211_extend_absent_time(data, tsf, &offset);
2689         do {
2690                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
2691                         break;
2692
2693                 tries++;
2694         } while (tries < max_tries);
2695
2696         return offset;
2697 }
2698
2699 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
2700 {
2701         u32 next_offset = BIT(31) - 1;
2702         int i;
2703
2704         data->absent = 0;
2705         data->has_next_tsf = false;
2706         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2707                 s32 start;
2708
2709                 if (!data->count[i])
2710                         continue;
2711
2712                 ieee80211_extend_noa_desc(data, tsf, i);
2713                 start = data->desc[i].start - tsf;
2714                 if (start <= 0)
2715                         data->absent |= BIT(i);
2716
2717                 if (next_offset > start)
2718                         next_offset = start;
2719
2720                 data->has_next_tsf = true;
2721         }
2722
2723         if (data->absent)
2724                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
2725
2726         data->next_tsf = tsf + next_offset;
2727 }
2728 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
2729
2730 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
2731                             struct ieee80211_noa_data *data, u32 tsf)
2732 {
2733         int ret = 0;
2734         int i;
2735
2736         memset(data, 0, sizeof(*data));
2737
2738         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2739                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
2740
2741                 if (!desc->count || !desc->duration)
2742                         continue;
2743
2744                 data->count[i] = desc->count;
2745                 data->desc[i].start = le32_to_cpu(desc->start_time);
2746                 data->desc[i].duration = le32_to_cpu(desc->duration);
2747                 data->desc[i].interval = le32_to_cpu(desc->interval);
2748
2749                 if (data->count[i] > 1 &&
2750                     data->desc[i].interval < data->desc[i].duration)
2751                         continue;
2752
2753                 ieee80211_extend_noa_desc(data, tsf, i);
2754                 ret++;
2755         }
2756
2757         if (ret)
2758                 ieee80211_update_p2p_noa(data, tsf);
2759
2760         return ret;
2761 }
2762 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
2763
2764 void ieee80211_recalc_dtim(struct ieee80211_local *local,
2765                            struct ieee80211_sub_if_data *sdata)
2766 {
2767         u64 tsf = drv_get_tsf(local, sdata);
2768         u64 dtim_count = 0;
2769         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
2770         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
2771         struct ps_data *ps;
2772         u8 bcns_from_dtim;
2773
2774         if (tsf == -1ULL || !beacon_int || !dtim_period)
2775                 return;
2776
2777         if (sdata->vif.type == NL80211_IFTYPE_AP ||
2778             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
2779                 if (!sdata->bss)
2780                         return;
2781
2782                 ps = &sdata->bss->ps;
2783         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2784                 ps = &sdata->u.mesh.ps;
2785         } else {
2786                 return;
2787         }
2788
2789         /*
2790          * actually finds last dtim_count, mac80211 will update in
2791          * __beacon_add_tim().
2792          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
2793          */
2794         do_div(tsf, beacon_int);
2795         bcns_from_dtim = do_div(tsf, dtim_period);
2796         /* just had a DTIM */
2797         if (!bcns_from_dtim)
2798                 dtim_count = 0;
2799         else
2800                 dtim_count = dtim_period - bcns_from_dtim;
2801
2802         ps->dtim_count = dtim_count;
2803 }