Pileus Git - ~andy/linux/blob - 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 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  38
  39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  40 {
  41         struct ieee80211_local *local;
  42         BUG_ON(!wiphy);
  43
  44         local = wiphy_priv(wiphy);
  45         return &local->hw;
  46 }
  47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  48
  49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  50                         enum nl80211_iftype type)
  51 {
  52         __le16 fc = hdr->frame_control;
  53
  54          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  55         if (len < 16)
  56                 return NULL;
  57
  58         if (ieee80211_is_data(fc)) {
  59                 if (len < 24) /* drop incorrect hdr len (data) */
  60                         return NULL;
  61
  62                 if (ieee80211_has_a4(fc))
  63                         return NULL;
  64                 if (ieee80211_has_tods(fc))
  65                         return hdr->addr1;
  66                 if (ieee80211_has_fromds(fc))
  67                         return hdr->addr2;
  68
  69                 return hdr->addr3;
  70         }
  71
  72         if (ieee80211_is_mgmt(fc)) {
  73                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  74                         return NULL;
  75                 return hdr->addr3;
  76         }
  77
  78         if (ieee80211_is_ctl(fc)) {
  79                 if (ieee80211_is_pspoll(fc))
  80                         return hdr->addr1;
  81
  82                 if (ieee80211_is_back_req(fc)) {
  83                         switch (type) {
  84                         case NL80211_IFTYPE_STATION:
  85                                 return hdr->addr2;
  86                         case NL80211_IFTYPE_AP:
  87                         case NL80211_IFTYPE_AP_VLAN:
  88                                 return hdr->addr1;
  89                         default:
  90                                 break; /* fall through to the return */
  91                         }
  92                 }
  93         }
  94
  95         return NULL;
  96 }
  97
  98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  99 {
 100         struct sk_buff *skb;
 101         struct ieee80211_hdr *hdr;
 102
 103         skb_queue_walk(&tx->skbs, skb) {
 104                 hdr = (struct ieee80211_hdr *) skb->data;
 105                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 106         }
 107 }
 108
 109 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
 110                              int rate, int erp, int short_preamble,
 111                              int shift)
 112 {
 113         int dur;
 114
 115         /* calculate duration (in microseconds, rounded up to next higher
 116          * integer if it includes a fractional microsecond) to send frame of
 117          * len bytes (does not include FCS) at the given rate. Duration will
 118          * also include SIFS.
 119          *
 120          * rate is in 100 kbps, so divident is multiplied by 10 in the
 121          * DIV_ROUND_UP() operations.
 122          *
 123          * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
 124          * is assumed to be 0 otherwise.
 125          */
 126
 127         if (band == IEEE80211_BAND_5GHZ || erp) {
 128                 /*
 129                  * OFDM:
 130                  *
 131                  * N_DBPS = DATARATE x 4
 132                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 133                  *      (16 = SIGNAL time, 6 = tail bits)
 134                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 135                  *
 136                  * T_SYM = 4 usec
 137                  * 802.11a - 18.5.2: aSIFSTime = 16 usec
 138                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 139                  *      signal ext = 6 usec
 140                  */
 141                 dur = 16; /* SIFS + signal ext */
 142                 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
 143                 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
 144
 145                 /* IEEE 802.11-2012 18.3.2.4: all values above are:
 146                  *  * times 4 for 5 MHz
 147                  *  * times 2 for 10 MHz
 148                  */
 149                 dur *= 1 << shift;
 150
 151                 /* rates should already consider the channel bandwidth,
 152                  * don't apply divisor again.
 153                  */
 154                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 155                                         4 * rate); /* T_SYM x N_SYM */
 156         } else {
 157                 /*
 158                  * 802.11b or 802.11g with 802.11b compatibility:
 159                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 160                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 161                  *
 162                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 163                  * aSIFSTime = 10 usec
 164                  * aPreambleLength = 144 usec or 72 usec with short preamble
 165                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 166                  */
 167                 dur = 10; /* aSIFSTime = 10 usec */
 168                 dur += short_preamble ? (72 + 24) : (144 + 48);
 169
 170                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 171         }
 172
 173         return dur;
 174 }
 175
 176 /* Exported duration function for driver use */
 177 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 178                                         struct ieee80211_vif *vif,
 179                                         enum ieee80211_band band,
 180                                         size_t frame_len,
 181                                         struct ieee80211_rate *rate)
 182 {
 183         struct ieee80211_sub_if_data *sdata;
 184         u16 dur;
 185         int erp, shift = 0;
 186         bool short_preamble = false;
 187
 188         erp = 0;
 189         if (vif) {
 190                 sdata = vif_to_sdata(vif);
 191                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 192                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 193                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 194                 shift = ieee80211_vif_get_shift(vif);
 195         }
 196
 197         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 198                                        short_preamble, shift);
 199
 200         return cpu_to_le16(dur);
 201 }
 202 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 203
 204 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 205                               struct ieee80211_vif *vif, size_t frame_len,
 206                               const struct ieee80211_tx_info *frame_txctl)
 207 {
 208         struct ieee80211_local *local = hw_to_local(hw);
 209         struct ieee80211_rate *rate;
 210         struct ieee80211_sub_if_data *sdata;
 211         bool short_preamble;
 212         int erp, shift = 0, bitrate;
 213         u16 dur;
 214         struct ieee80211_supported_band *sband;
 215
 216         sband = local->hw.wiphy->bands[frame_txctl->band];
 217
 218         short_preamble = false;
 219
 220         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 221
 222         erp = 0;
 223         if (vif) {
 224                 sdata = vif_to_sdata(vif);
 225                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 226                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 227                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 228                 shift = ieee80211_vif_get_shift(vif);
 229         }
 230
 231         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 232
 233         /* CTS duration */
 234         dur = ieee80211_frame_duration(sband->band, 10, bitrate,
 235                                        erp, short_preamble, shift);
 236         /* Data frame duration */
 237         dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
 238                                         erp, short_preamble, shift);
 239         /* ACK duration */
 240         dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 241                                         erp, short_preamble, shift);
 242
 243         return cpu_to_le16(dur);
 244 }
 245 EXPORT_SYMBOL(ieee80211_rts_duration);
 246
 247 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 248                                     struct ieee80211_vif *vif,
 249                                     size_t frame_len,
 250                                     const struct ieee80211_tx_info *frame_txctl)
 251 {
 252         struct ieee80211_local *local = hw_to_local(hw);
 253         struct ieee80211_rate *rate;
 254         struct ieee80211_sub_if_data *sdata;
 255         bool short_preamble;
 256         int erp, shift = 0, bitrate;
 257         u16 dur;
 258         struct ieee80211_supported_band *sband;
 259
 260         sband = local->hw.wiphy->bands[frame_txctl->band];
 261
 262         short_preamble = false;
 263
 264         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 265         erp = 0;
 266         if (vif) {
 267                 sdata = vif_to_sdata(vif);
 268                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 269                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 270                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 271                 shift = ieee80211_vif_get_shift(vif);
 272         }
 273
 274         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 275
 276         /* Data frame duration */
 277         dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
 278                                        erp, short_preamble, shift);
 279         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 280                 /* ACK duration */
 281                 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 282                                                 erp, short_preamble, shift);
 283         }
 284
 285         return cpu_to_le16(dur);
 286 }
 287 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 288
 289 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 290 {
 291         struct ieee80211_sub_if_data *sdata;
 292         int n_acs = IEEE80211_NUM_ACS;
 293
 294         if (local->hw.queues < IEEE80211_NUM_ACS)
 295                 n_acs = 1;
 296
 297         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 298                 int ac;
 299
 300                 if (!sdata->dev)
 301                         continue;
 302
 303                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 304                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 305                         continue;
 306
 307                 for (ac = 0; ac < n_acs; ac++) {
 308                         int ac_queue = sdata->vif.hw_queue[ac];
 309
 310                         if (ac_queue == queue ||
 311                             (sdata->vif.cab_queue == queue &&
 312                              local->queue_stop_reasons[ac_queue] == 0 &&
 313                              skb_queue_empty(&local->pending[ac_queue])))
 314                                 netif_wake_subqueue(sdata->dev, ac);
 315                 }
 316         }
 317 }
 318
 319 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 320                                    enum queue_stop_reason reason)
 321 {
 322         struct ieee80211_local *local = hw_to_local(hw);
 323
 324         trace_wake_queue(local, queue, reason);
 325
 326         if (WARN_ON(queue >= hw->queues))
 327                 return;
 328
 329         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 330                 return;
 331
 332         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 333
 334         if (local->queue_stop_reasons[queue] != 0)
 335                 /* someone still has this queue stopped */
 336                 return;
 337
 338         if (skb_queue_empty(&local->pending[queue])) {
 339                 rcu_read_lock();
 340                 ieee80211_propagate_queue_wake(local, queue);
 341                 rcu_read_unlock();
 342         } else
 343                 tasklet_schedule(&local->tx_pending_tasklet);
 344 }
 345
 346 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 347                                     enum queue_stop_reason reason)
 348 {
 349         struct ieee80211_local *local = hw_to_local(hw);
 350         unsigned long flags;
 351
 352         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 353         __ieee80211_wake_queue(hw, queue, reason);
 354         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 355 }
 356
 357 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 358 {
 359         ieee80211_wake_queue_by_reason(hw, queue,
 360                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 361 }
 362 EXPORT_SYMBOL(ieee80211_wake_queue);
 363
 364 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 365                                    enum queue_stop_reason reason)
 366 {
 367         struct ieee80211_local *local = hw_to_local(hw);
 368         struct ieee80211_sub_if_data *sdata;
 369         int n_acs = IEEE80211_NUM_ACS;
 370
 371         trace_stop_queue(local, queue, reason);
 372
 373         if (WARN_ON(queue >= hw->queues))
 374                 return;
 375
 376         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 377                 return;
 378
 379         __set_bit(reason, &local->queue_stop_reasons[queue]);
 380
 381         if (local->hw.queues < IEEE80211_NUM_ACS)
 382                 n_acs = 1;
 383
 384         rcu_read_lock();
 385         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 386                 int ac;
 387
 388                 if (!sdata->dev)
 389                         continue;
 390
 391                 for (ac = 0; ac < n_acs; ac++) {
 392                         if (sdata->vif.hw_queue[ac] == queue ||
 393                             sdata->vif.cab_queue == queue)
 394                                 netif_stop_subqueue(sdata->dev, ac);
 395                 }
 396         }
 397         rcu_read_unlock();
 398 }
 399
 400 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 401                                     enum queue_stop_reason reason)
 402 {
 403         struct ieee80211_local *local = hw_to_local(hw);
 404         unsigned long flags;
 405
 406         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 407         __ieee80211_stop_queue(hw, queue, reason);
 408         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 409 }
 410
 411 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 412 {
 413         ieee80211_stop_queue_by_reason(hw, queue,
 414                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 415 }
 416 EXPORT_SYMBOL(ieee80211_stop_queue);
 417
 418 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 419                                struct sk_buff *skb)
 420 {
 421         struct ieee80211_hw *hw = &local->hw;
 422         unsigned long flags;
 423         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 424         int queue = info->hw_queue;
 425
 426         if (WARN_ON(!info->control.vif)) {
 427                 ieee80211_free_txskb(&local->hw, skb);
 428                 return;
 429         }
 430
 431         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 432         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 433         __skb_queue_tail(&local->pending[queue], skb);
 434         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 435         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 436 }
 437
 438 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 439                                 struct sk_buff_head *skbs)
 440 {
 441         struct ieee80211_hw *hw = &local->hw;
 442         struct sk_buff *skb;
 443         unsigned long flags;
 444         int queue, i;
 445
 446         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 447         while ((skb = skb_dequeue(skbs))) {
 448                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 449
 450                 if (WARN_ON(!info->control.vif)) {
 451                         ieee80211_free_txskb(&local->hw, skb);
 452                         continue;
 453                 }
 454
 455                 queue = info->hw_queue;
 456
 457                 __ieee80211_stop_queue(hw, queue,
 458                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 459
 460                 __skb_queue_tail(&local->pending[queue], skb);
 461         }
 462
 463         for (i = 0; i < hw->queues; i++)
 464                 __ieee80211_wake_queue(hw, i,
 465                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 466         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 467 }
 468
 469 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 470                                      unsigned long queues,
 471                                      enum queue_stop_reason reason)
 472 {
 473         struct ieee80211_local *local = hw_to_local(hw);
 474         unsigned long flags;
 475         int i;
 476
 477         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 478
 479         for_each_set_bit(i, &queues, hw->queues)
 480                 __ieee80211_stop_queue(hw, i, reason);
 481
 482         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 483 }
 484
 485 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 486 {
 487         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 488                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 489 }
 490 EXPORT_SYMBOL(ieee80211_stop_queues);
 491
 492 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 493 {
 494         struct ieee80211_local *local = hw_to_local(hw);
 495         unsigned long flags;
 496         int ret;
 497
 498         if (WARN_ON(queue >= hw->queues))
 499                 return true;
 500
 501         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 502         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 503                        &local->queue_stop_reasons[queue]);
 504         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 505         return ret;
 506 }
 507 EXPORT_SYMBOL(ieee80211_queue_stopped);
 508
 509 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 510                                      unsigned long queues,
 511                                      enum queue_stop_reason reason)
 512 {
 513         struct ieee80211_local *local = hw_to_local(hw);
 514         unsigned long flags;
 515         int i;
 516
 517         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 518
 519         for_each_set_bit(i, &queues, hw->queues)
 520                 __ieee80211_wake_queue(hw, i, reason);
 521
 522         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 523 }
 524
 525 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 526 {
 527         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 528                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 529 }
 530 EXPORT_SYMBOL(ieee80211_wake_queues);
 531
 532 void ieee80211_flush_queues(struct ieee80211_local *local,
 533                             struct ieee80211_sub_if_data *sdata)
 534 {
 535         u32 queues;
 536
 537         if (!local->ops->flush)
 538                 return;
 539
 540         if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
 541                 int ac;
 542
 543                 queues = 0;
 544
 545                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 546                         queues |= BIT(sdata->vif.hw_queue[ac]);
 547                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 548                         queues |= BIT(sdata->vif.cab_queue);
 549         } else {
 550                 /* all queues */
 551                 queues = BIT(local->hw.queues) - 1;
 552         }
 553
 554         ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 555                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 556
 557         drv_flush(local, queues, false);
 558
 559         ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 560                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 561 }
 562
 563 static void __iterate_active_interfaces(struct ieee80211_local *local,
 564                                         u32 iter_flags,
 565                                         void (*iterator)(void *data, u8 *mac,
 566                                                 struct ieee80211_vif *vif),
 567                                         void *data)
 568 {
 569         struct ieee80211_sub_if_data *sdata;
 570
 571         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 572                 switch (sdata->vif.type) {
 573                 case NL80211_IFTYPE_MONITOR:
 574                         if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 575                                 continue;
 576                         break;
 577                 case NL80211_IFTYPE_AP_VLAN:
 578                         continue;
 579                 default:
 580                         break;
 581                 }
 582                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 583                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 584                         continue;
 585                 if (ieee80211_sdata_running(sdata))
 586                         iterator(data, sdata->vif.addr,
 587                                  &sdata->vif);
 588         }
 589
 590         sdata = rcu_dereference_check(local->monitor_sdata,
 591                                       lockdep_is_held(&local->iflist_mtx) ||
 592                                       lockdep_rtnl_is_held());
 593         if (sdata &&
 594             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 595              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 596                 iterator(data, sdata->vif.addr, &sdata->vif);
 597 }
 598
 599 void ieee80211_iterate_active_interfaces(
 600         struct ieee80211_hw *hw, u32 iter_flags,
 601         void (*iterator)(void *data, u8 *mac,
 602                          struct ieee80211_vif *vif),
 603         void *data)
 604 {
 605         struct ieee80211_local *local = hw_to_local(hw);
 606
 607         mutex_lock(&local->iflist_mtx);
 608         __iterate_active_interfaces(local, iter_flags, iterator, data);
 609         mutex_unlock(&local->iflist_mtx);
 610 }
 611 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 612
 613 void ieee80211_iterate_active_interfaces_atomic(
 614         struct ieee80211_hw *hw, u32 iter_flags,
 615         void (*iterator)(void *data, u8 *mac,
 616                          struct ieee80211_vif *vif),
 617         void *data)
 618 {
 619         struct ieee80211_local *local = hw_to_local(hw);
 620
 621         rcu_read_lock();
 622         __iterate_active_interfaces(local, iter_flags, iterator, data);
 623         rcu_read_unlock();
 624 }
 625 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 626
 627 void ieee80211_iterate_active_interfaces_rtnl(
 628         struct ieee80211_hw *hw, u32 iter_flags,
 629         void (*iterator)(void *data, u8 *mac,
 630                          struct ieee80211_vif *vif),
 631         void *data)
 632 {
 633         struct ieee80211_local *local = hw_to_local(hw);
 634
 635         ASSERT_RTNL();
 636
 637         __iterate_active_interfaces(local, iter_flags, iterator, data);
 638 }
 639 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
 640
 641 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
 642 {
 643         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 644
 645         if (!ieee80211_sdata_running(sdata) ||
 646             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 647                 return NULL;
 648         return &sdata->vif;
 649 }
 650 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
 651
 652 /*
 653  * Nothing should have been stuffed into the workqueue during
 654  * the suspend->resume cycle. If this WARN is seen then there
 655  * is a bug with either the driver suspend or something in
 656  * mac80211 stuffing into the workqueue which we haven't yet
 657  * cleared during mac80211's suspend cycle.
 658  */
 659 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 660 {
 661         if (WARN(local->suspended && !local->resuming,
 662                  "queueing ieee80211 work while going to suspend\n"))
 663                 return false;
 664
 665         return true;
 666 }
 667
 668 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 669 {
 670         struct ieee80211_local *local = hw_to_local(hw);
 671
 672         if (!ieee80211_can_queue_work(local))
 673                 return;
 674
 675         queue_work(local->workqueue, work);
 676 }
 677 EXPORT_SYMBOL(ieee80211_queue_work);
 678
 679 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 680                                   struct delayed_work *dwork,
 681                                   unsigned long delay)
 682 {
 683         struct ieee80211_local *local = hw_to_local(hw);
 684
 685         if (!ieee80211_can_queue_work(local))
 686                 return;
 687
 688         queue_delayed_work(local->workqueue, dwork, delay);
 689 }
 690 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 691
 692 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 693                                struct ieee802_11_elems *elems,
 694                                u64 filter, u32 crc)
 695 {
 696         size_t left = len;
 697         const u8 *pos = start;
 698         bool calc_crc = filter != 0;
 699         DECLARE_BITMAP(seen_elems, 256);
 700         const u8 *ie;
 701
 702         bitmap_zero(seen_elems, 256);
 703         memset(elems, 0, sizeof(*elems));
 704         elems->ie_start = start;
 705         elems->total_len = len;
 706
 707         while (left >= 2) {
 708                 u8 id, elen;
 709                 bool elem_parse_failed;
 710
 711                 id = *pos++;
 712                 elen = *pos++;
 713                 left -= 2;
 714
 715                 if (elen > left) {
 716                         elems->parse_error = true;
 717                         break;
 718                 }
 719
 720                 switch (id) {
 721                 case WLAN_EID_SSID:
 722                 case WLAN_EID_SUPP_RATES:
 723                 case WLAN_EID_FH_PARAMS:
 724                 case WLAN_EID_DS_PARAMS:
 725                 case WLAN_EID_CF_PARAMS:
 726                 case WLAN_EID_TIM:
 727                 case WLAN_EID_IBSS_PARAMS:
 728                 case WLAN_EID_CHALLENGE:
 729                 case WLAN_EID_RSN:
 730                 case WLAN_EID_ERP_INFO:
 731                 case WLAN_EID_EXT_SUPP_RATES:
 732                 case WLAN_EID_HT_CAPABILITY:
 733                 case WLAN_EID_HT_OPERATION:
 734                 case WLAN_EID_VHT_CAPABILITY:
 735                 case WLAN_EID_VHT_OPERATION:
 736                 case WLAN_EID_MESH_ID:
 737                 case WLAN_EID_MESH_CONFIG:
 738                 case WLAN_EID_PEER_MGMT:
 739                 case WLAN_EID_PREQ:
 740                 case WLAN_EID_PREP:
 741                 case WLAN_EID_PERR:
 742                 case WLAN_EID_RANN:
 743                 case WLAN_EID_CHANNEL_SWITCH:
 744                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 745                 case WLAN_EID_COUNTRY:
 746                 case WLAN_EID_PWR_CONSTRAINT:
 747                 case WLAN_EID_TIMEOUT_INTERVAL:
 748                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 749                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 750                 case WLAN_EID_CHAN_SWITCH_PARAM:
 751                 /*
 752                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 753                  * that if the content gets bigger it might be needed more than once
 754                  */
 755                         if (test_bit(id, seen_elems)) {
 756                                 elems->parse_error = true;
 757                                 left -= elen;
 758                                 pos += elen;
 759                                 continue;
 760                         }
 761                         break;
 762                 }
 763
 764                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 765                         crc = crc32_be(crc, pos - 2, elen + 2);
 766
 767                 elem_parse_failed = false;
 768
 769                 switch (id) {
 770                 case WLAN_EID_SSID:
 771                         elems->ssid = pos;
 772                         elems->ssid_len = elen;
 773                         break;
 774                 case WLAN_EID_SUPP_RATES:
 775                         elems->supp_rates = pos;
 776                         elems->supp_rates_len = elen;
 777                         break;
 778                 case WLAN_EID_DS_PARAMS:
 779                         if (elen >= 1)
 780                                 elems->ds_params = pos;
 781                         else
 782                                 elem_parse_failed = true;
 783                         break;
 784                 case WLAN_EID_TIM:
 785                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 786                                 elems->tim = (void *)pos;
 787                                 elems->tim_len = elen;
 788                         } else
 789                                 elem_parse_failed = true;
 790                         break;
 791                 case WLAN_EID_CHALLENGE:
 792                         elems->challenge = pos;
 793                         elems->challenge_len = elen;
 794                         break;
 795                 case WLAN_EID_VENDOR_SPECIFIC:
 796                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 797                             pos[2] == 0xf2) {
 798                                 /* Microsoft OUI (00:50:F2) */
 799
 800                                 if (calc_crc)
 801                                         crc = crc32_be(crc, pos - 2, elen + 2);
 802
 803                                 if (elen >= 5 && pos[3] == 2) {
 804                                         /* OUI Type 2 - WMM IE */
 805                                         if (pos[4] == 0) {
 806                                                 elems->wmm_info = pos;
 807                                                 elems->wmm_info_len = elen;
 808                                         } else if (pos[4] == 1) {
 809                                                 elems->wmm_param = pos;
 810                                                 elems->wmm_param_len = elen;
 811                                         }
 812                                 }
 813                         }
 814                         break;
 815                 case WLAN_EID_RSN:
 816                         elems->rsn = pos;
 817                         elems->rsn_len = elen;
 818                         break;
 819                 case WLAN_EID_ERP_INFO:
 820                         if (elen >= 1)
 821                                 elems->erp_info = pos;
 822                         else
 823                                 elem_parse_failed = true;
 824                         break;
 825                 case WLAN_EID_EXT_SUPP_RATES:
 826                         elems->ext_supp_rates = pos;
 827                         elems->ext_supp_rates_len = elen;
 828                         break;
 829                 case WLAN_EID_HT_CAPABILITY:
 830                         if (elen >= sizeof(struct ieee80211_ht_cap))
 831                                 elems->ht_cap_elem = (void *)pos;
 832                         else
 833                                 elem_parse_failed = true;
 834                         break;
 835                 case WLAN_EID_HT_OPERATION:
 836                         if (elen >= sizeof(struct ieee80211_ht_operation))
 837                                 elems->ht_operation = (void *)pos;
 838                         else
 839                                 elem_parse_failed = true;
 840                         break;
 841                 case WLAN_EID_VHT_CAPABILITY:
 842                         if (elen >= sizeof(struct ieee80211_vht_cap))
 843                                 elems->vht_cap_elem = (void *)pos;
 844                         else
 845                                 elem_parse_failed = true;
 846                         break;
 847                 case WLAN_EID_VHT_OPERATION:
 848                         if (elen >= sizeof(struct ieee80211_vht_operation))
 849                                 elems->vht_operation = (void *)pos;
 850                         else
 851                                 elem_parse_failed = true;
 852                         break;
 853                 case WLAN_EID_OPMODE_NOTIF:
 854                         if (elen > 0)
 855                                 elems->opmode_notif = pos;
 856                         else
 857                                 elem_parse_failed = true;
 858                         break;
 859                 case WLAN_EID_MESH_ID:
 860                         elems->mesh_id = pos;
 861                         elems->mesh_id_len = elen;
 862                         break;
 863                 case WLAN_EID_MESH_CONFIG:
 864                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 865                                 elems->mesh_config = (void *)pos;
 866                         else
 867                                 elem_parse_failed = true;
 868                         break;
 869                 case WLAN_EID_PEER_MGMT:
 870                         elems->peering = pos;
 871                         elems->peering_len = elen;
 872                         break;
 873                 case WLAN_EID_MESH_AWAKE_WINDOW:
 874                         if (elen >= 2)
 875                                 elems->awake_window = (void *)pos;
 876                         break;
 877                 case WLAN_EID_PREQ:
 878                         elems->preq = pos;
 879                         elems->preq_len = elen;
 880                         break;
 881                 case WLAN_EID_PREP:
 882                         elems->prep = pos;
 883                         elems->prep_len = elen;
 884                         break;
 885                 case WLAN_EID_PERR:
 886                         elems->perr = pos;
 887                         elems->perr_len = elen;
 888                         break;
 889                 case WLAN_EID_RANN:
 890                         if (elen >= sizeof(struct ieee80211_rann_ie))
 891                                 elems->rann = (void *)pos;
 892                         else
 893                                 elem_parse_failed = true;
 894                         break;
 895                 case WLAN_EID_CHANNEL_SWITCH:
 896                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 897                                 elem_parse_failed = true;
 898                                 break;
 899                         }
 900                         elems->ch_switch_ie = (void *)pos;
 901                         break;
 902                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 903                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
 904                                 elem_parse_failed = true;
 905                                 break;
 906                         }
 907                         elems->ext_chansw_ie = (void *)pos;
 908                         break;
 909                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 910                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
 911                                 elem_parse_failed = true;
 912                                 break;
 913                         }
 914                         elems->sec_chan_offs = (void *)pos;
 915                         break;
 916                 case WLAN_EID_CHAN_SWITCH_PARAM:
 917                         if (elen !=
 918                             sizeof(*elems->mesh_chansw_params_ie)) {
 919                                 elem_parse_failed = true;
 920                                 break;
 921                         }
 922                         elems->mesh_chansw_params_ie = (void *)pos;
 923                         break;
 924                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 925                         if (!action ||
 926                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
 927                                 elem_parse_failed = true;
 928                                 break;
 929                         }
 930                         elems->wide_bw_chansw_ie = (void *)pos;
 931                         break;
 932                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
 933                         if (action) {
 934                                 elem_parse_failed = true;
 935                                 break;
 936                         }
 937                         /*
 938                          * This is a bit tricky, but as we only care about
 939                          * the wide bandwidth channel switch element, so
 940                          * just parse it out manually.
 941                          */
 942                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
 943                                               pos, elen);
 944                         if (ie) {
 945                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
 946                                         elems->wide_bw_chansw_ie =
 947                                                 (void *)(ie + 2);
 948                                 else
 949                                         elem_parse_failed = true;
 950                         }
 951                         break;
 952                 case WLAN_EID_COUNTRY:
 953                         elems->country_elem = pos;
 954                         elems->country_elem_len = elen;
 955                         break;
 956                 case WLAN_EID_PWR_CONSTRAINT:
 957                         if (elen != 1) {
 958                                 elem_parse_failed = true;
 959                                 break;
 960                         }
 961                         elems->pwr_constr_elem = pos;
 962                         break;
 963                 case WLAN_EID_TIMEOUT_INTERVAL:
 964                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
 965                                 elems->timeout_int = (void *)pos;
 966                         else
 967                                 elem_parse_failed = true;
 968                         break;
 969                 default:
 970                         break;
 971                 }
 972
 973                 if (elem_parse_failed)
 974                         elems->parse_error = true;
 975                 else
 976                         __set_bit(id, seen_elems);
 977
 978                 left -= elen;
 979                 pos += elen;
 980         }
 981
 982         if (left != 0)
 983                 elems->parse_error = true;
 984
 985         return crc;
 986 }
 987
 988 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 989                                bool bss_notify)
 990 {
 991         struct ieee80211_local *local = sdata->local;
 992         struct ieee80211_tx_queue_params qparam;
 993         struct ieee80211_chanctx_conf *chanctx_conf;
 994         int ac;
 995         bool use_11b, enable_qos;
 996         int aCWmin, aCWmax;
 997
 998         if (!local->ops->conf_tx)
 999                 return;
1000
1001         if (local->hw.queues < IEEE80211_NUM_ACS)
1002                 return;
1003
1004         memset(&qparam, 0, sizeof(qparam));
1005
1006         rcu_read_lock();
1007         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1008         use_11b = (chanctx_conf &&
1009                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1010                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1011         rcu_read_unlock();
1012
1013         /*
1014          * By default disable QoS in STA mode for old access points, which do
1015          * not support 802.11e. New APs will provide proper queue parameters,
1016          * that we will configure later.
1017          */
1018         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
1019
1020         /* Set defaults according to 802.11-2007 Table 7-37 */
1021         aCWmax = 1023;
1022         if (use_11b)
1023                 aCWmin = 31;
1024         else
1025                 aCWmin = 15;
1026
1027         /* Confiure old 802.11b/g medium access rules. */
1028         qparam.cw_max = aCWmax;
1029         qparam.cw_min = aCWmin;
1030         qparam.txop = 0;
1031         qparam.aifs = 2;
1032
1033         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1034                 /* Update if QoS is enabled. */
1035                 if (enable_qos) {
1036                         switch (ac) {
1037                         case IEEE80211_AC_BK:
1038                                 qparam.cw_max = aCWmax;
1039                                 qparam.cw_min = aCWmin;
1040                                 qparam.txop = 0;
1041                                 qparam.aifs = 7;
1042                                 break;
1043                         /* never happens but let's not leave undefined */
1044                         default:
1045                         case IEEE80211_AC_BE:
1046                                 qparam.cw_max = aCWmax;
1047                                 qparam.cw_min = aCWmin;
1048                                 qparam.txop = 0;
1049                                 qparam.aifs = 3;
1050                                 break;
1051                         case IEEE80211_AC_VI:
1052                                 qparam.cw_max = aCWmin;
1053                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1054                                 if (use_11b)
1055                                         qparam.txop = 6016/32;
1056                                 else
1057                                         qparam.txop = 3008/32;
1058                                 qparam.aifs = 2;
1059                                 break;
1060                         case IEEE80211_AC_VO:
1061                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1062                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1063                                 if (use_11b)
1064                                         qparam.txop = 3264/32;
1065                                 else
1066                                         qparam.txop = 1504/32;
1067                                 qparam.aifs = 2;
1068                                 break;
1069                         }
1070                 }
1071
1072                 qparam.uapsd = false;
1073
1074                 sdata->tx_conf[ac] = qparam;
1075                 drv_conf_tx(local, sdata, ac, &qparam);
1076         }
1077
1078         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1079             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1080                 sdata->vif.bss_conf.qos = enable_qos;
1081                 if (bss_notify)
1082                         ieee80211_bss_info_change_notify(sdata,
1083                                                          BSS_CHANGED_QOS);
1084         }
1085 }
1086
1087 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1088                          u16 transaction, u16 auth_alg, u16 status,
1089                          const u8 *extra, size_t extra_len, const u8 *da,
1090                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1091                          u32 tx_flags)
1092 {
1093         struct ieee80211_local *local = sdata->local;
1094         struct sk_buff *skb;
1095         struct ieee80211_mgmt *mgmt;
1096         int err;
1097
1098         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1099         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24 + 6 + extra_len);
1100         if (!skb)
1101                 return;
1102
1103         skb_reserve(skb, local->hw.extra_tx_headroom);
1104
1105         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1106         memset(mgmt, 0, 24 + 6);
1107         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1108                                           IEEE80211_STYPE_AUTH);
1109         memcpy(mgmt->da, da, ETH_ALEN);
1110         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1111         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1112         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1113         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1114         mgmt->u.auth.status_code = cpu_to_le16(status);
1115         if (extra)
1116                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1117
1118         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1119                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1120                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1121                 WARN_ON(err);
1122         }
1123
1124         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1125                                         tx_flags;
1126         ieee80211_tx_skb(sdata, skb);
1127 }
1128
1129 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1130                                     const u8 *bssid, u16 stype, u16 reason,
1131                                     bool send_frame, u8 *frame_buf)
1132 {
1133         struct ieee80211_local *local = sdata->local;
1134         struct sk_buff *skb;
1135         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1136
1137         /* build frame */
1138         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1139         mgmt->duration = 0; /* initialize only */
1140         mgmt->seq_ctrl = 0; /* initialize only */
1141         memcpy(mgmt->da, bssid, ETH_ALEN);
1142         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1143         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1144         /* u.deauth.reason_code == u.disassoc.reason_code */
1145         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1146
1147         if (send_frame) {
1148                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1149                                     IEEE80211_DEAUTH_FRAME_LEN);
1150                 if (!skb)
1151                         return;
1152
1153                 skb_reserve(skb, local->hw.extra_tx_headroom);
1154
1155                 /* copy in frame */
1156                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1157                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1158
1159                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1160                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1161                         IEEE80211_SKB_CB(skb)->flags |=
1162                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1163
1164                 ieee80211_tx_skb(sdata, skb);
1165         }
1166 }
1167
1168 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1169                              size_t buffer_len, const u8 *ie, size_t ie_len,
1170                              enum ieee80211_band band, u32 rate_mask,
1171                              struct cfg80211_chan_def *chandef)
1172 {
1173         struct ieee80211_supported_band *sband;
1174         u8 *pos = buffer, *end = buffer + buffer_len;
1175         size_t offset = 0, noffset;
1176         int supp_rates_len, i;
1177         u8 rates[32];
1178         int num_rates;
1179         int ext_rates_len;
1180         int shift;
1181         u32 rate_flags;
1182
1183         sband = local->hw.wiphy->bands[band];
1184         if (WARN_ON_ONCE(!sband))
1185                 return 0;
1186
1187         rate_flags = ieee80211_chandef_rate_flags(chandef);
1188         shift = ieee80211_chandef_get_shift(chandef);
1189
1190         num_rates = 0;
1191         for (i = 0; i < sband->n_bitrates; i++) {
1192                 if ((BIT(i) & rate_mask) == 0)
1193                         continue; /* skip rate */
1194                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1195                         continue;
1196
1197                 rates[num_rates++] =
1198                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1199                                           (1 << shift) * 5);
1200         }
1201
1202         supp_rates_len = min_t(int, num_rates, 8);
1203
1204         if (end - pos < 2 + supp_rates_len)
1205                 goto out_err;
1206         *pos++ = WLAN_EID_SUPP_RATES;
1207         *pos++ = supp_rates_len;
1208         memcpy(pos, rates, supp_rates_len);
1209         pos += supp_rates_len;
1210
1211         /* insert "request information" if in custom IEs */
1212         if (ie && ie_len) {
1213                 static const u8 before_extrates[] = {
1214                         WLAN_EID_SSID,
1215                         WLAN_EID_SUPP_RATES,
1216                         WLAN_EID_REQUEST,
1217                 };
1218                 noffset = ieee80211_ie_split(ie, ie_len,
1219                                              before_extrates,
1220                                              ARRAY_SIZE(before_extrates),
1221                                              offset);
1222                 if (end - pos < noffset - offset)
1223                         goto out_err;
1224                 memcpy(pos, ie + offset, noffset - offset);
1225                 pos += noffset - offset;
1226                 offset = noffset;
1227         }
1228
1229         ext_rates_len = num_rates - supp_rates_len;
1230         if (ext_rates_len > 0) {
1231                 if (end - pos < 2 + ext_rates_len)
1232                         goto out_err;
1233                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1234                 *pos++ = ext_rates_len;
1235                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1236                 pos += ext_rates_len;
1237         }
1238
1239         if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1240                 if (end - pos < 3)
1241                         goto out_err;
1242                 *pos++ = WLAN_EID_DS_PARAMS;
1243                 *pos++ = 1;
1244                 *pos++ = ieee80211_frequency_to_channel(
1245                                 chandef->chan->center_freq);
1246         }
1247
1248         /* insert custom IEs that go before HT */
1249         if (ie && ie_len) {
1250                 static const u8 before_ht[] = {
1251                         WLAN_EID_SSID,
1252                         WLAN_EID_SUPP_RATES,
1253                         WLAN_EID_REQUEST,
1254                         WLAN_EID_EXT_SUPP_RATES,
1255                         WLAN_EID_DS_PARAMS,
1256                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1257                 };
1258                 noffset = ieee80211_ie_split(ie, ie_len,
1259                                              before_ht, ARRAY_SIZE(before_ht),
1260                                              offset);
1261                 if (end - pos < noffset - offset)
1262                         goto out_err;
1263                 memcpy(pos, ie + offset, noffset - offset);
1264                 pos += noffset - offset;
1265                 offset = noffset;
1266         }
1267
1268         if (sband->ht_cap.ht_supported) {
1269                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1270                         goto out_err;
1271                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1272                                                 sband->ht_cap.cap);
1273         }
1274
1275         /*
1276          * If adding more here, adjust code in main.c
1277          * that calculates local->scan_ies_len.
1278          */
1279
1280         /* add any remaining custom IEs */
1281         if (ie && ie_len) {
1282                 noffset = ie_len;
1283                 if (end - pos < noffset - offset)
1284                         goto out_err;
1285                 memcpy(pos, ie + offset, noffset - offset);
1286                 pos += noffset - offset;
1287         }
1288
1289         if (sband->vht_cap.vht_supported) {
1290                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1291                         goto out_err;
1292                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1293                                                  sband->vht_cap.cap);
1294         }
1295
1296         return pos - buffer;
1297  out_err:
1298         WARN_ONCE(1, "not enough space for preq IEs\n");
1299         return pos - buffer;
1300 }
1301
1302 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1303                                           u8 *dst, u32 ratemask,
1304                                           struct ieee80211_channel *chan,
1305                                           const u8 *ssid, size_t ssid_len,
1306                                           const u8 *ie, size_t ie_len,
1307                                           bool directed)
1308 {
1309         struct ieee80211_local *local = sdata->local;
1310         struct cfg80211_chan_def chandef;
1311         struct sk_buff *skb;
1312         struct ieee80211_mgmt *mgmt;
1313         int ies_len;
1314
1315         /*
1316          * Do not send DS Channel parameter for directed probe requests
1317          * in order to maximize the chance that we get a response.  Some
1318          * badly-behaved APs don't respond when this parameter is included.
1319          */
1320         chandef.width = sdata->vif.bss_conf.chandef.width;
1321         if (directed)
1322                 chandef.chan = NULL;
1323         else
1324                 chandef.chan = chan;
1325
1326         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1327                                      ssid, ssid_len, 100 + ie_len);
1328         if (!skb)
1329                 return NULL;
1330
1331         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1332                                            skb_tailroom(skb),
1333                                            ie, ie_len, chan->band,
1334                                            ratemask, &chandef);
1335         skb_put(skb, ies_len);
1336
1337         if (dst) {
1338                 mgmt = (struct ieee80211_mgmt *) skb->data;
1339                 memcpy(mgmt->da, dst, ETH_ALEN);
1340                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1341         }
1342
1343         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1344
1345         return skb;
1346 }
1347
1348 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1349                               const u8 *ssid, size_t ssid_len,
1350                               const u8 *ie, size_t ie_len,
1351                               u32 ratemask, bool directed, u32 tx_flags,
1352                               struct ieee80211_channel *channel, bool scan)
1353 {
1354         struct sk_buff *skb;
1355
1356         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1357                                         ssid, ssid_len,
1358                                         ie, ie_len, directed);
1359         if (skb) {
1360                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1361                 if (scan)
1362                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1363                 else
1364                         ieee80211_tx_skb(sdata, skb);
1365         }
1366 }
1367
1368 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1369                             struct ieee802_11_elems *elems,
1370                             enum ieee80211_band band, u32 *basic_rates)
1371 {
1372         struct ieee80211_supported_band *sband;
1373         struct ieee80211_rate *bitrates;
1374         size_t num_rates;
1375         u32 supp_rates, rate_flags;
1376         int i, j, shift;
1377         sband = sdata->local->hw.wiphy->bands[band];
1378
1379         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1380         shift = ieee80211_vif_get_shift(&sdata->vif);
1381
1382         if (WARN_ON(!sband))
1383                 return 1;
1384
1385         bitrates = sband->bitrates;
1386         num_rates = sband->n_bitrates;
1387         supp_rates = 0;
1388         for (i = 0; i < elems->supp_rates_len +
1389                      elems->ext_supp_rates_len; i++) {
1390                 u8 rate = 0;
1391                 int own_rate;
1392                 bool is_basic;
1393                 if (i < elems->supp_rates_len)
1394                         rate = elems->supp_rates[i];
1395                 else if (elems->ext_supp_rates)
1396                         rate = elems->ext_supp_rates
1397                                 [i - elems->supp_rates_len];
1398                 own_rate = 5 * (rate & 0x7f);
1399                 is_basic = !!(rate & 0x80);
1400
1401                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1402                         continue;
1403
1404                 for (j = 0; j < num_rates; j++) {
1405                         int brate;
1406                         if ((rate_flags & sband->bitrates[j].flags)
1407                             != rate_flags)
1408                                 continue;
1409
1410                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1411                                              1 << shift);
1412
1413                         if (brate == own_rate) {
1414                                 supp_rates |= BIT(j);
1415                                 if (basic_rates && is_basic)
1416                                         *basic_rates |= BIT(j);
1417                         }
1418                 }
1419         }
1420         return supp_rates;
1421 }
1422
1423 void ieee80211_stop_device(struct ieee80211_local *local)
1424 {
1425         ieee80211_led_radio(local, false);
1426         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1427
1428         cancel_work_sync(&local->reconfig_filter);
1429
1430         flush_workqueue(local->workqueue);
1431         drv_stop(local);
1432 }
1433
1434 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1435                                      struct ieee80211_sub_if_data *sdata)
1436 {
1437         struct ieee80211_chanctx_conf *conf;
1438         struct ieee80211_chanctx *ctx;
1439
1440         if (!local->use_chanctx)
1441                 return;
1442
1443         mutex_lock(&local->chanctx_mtx);
1444         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1445                                          lockdep_is_held(&local->chanctx_mtx));
1446         if (conf) {
1447                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1448                 drv_assign_vif_chanctx(local, sdata, ctx);
1449         }
1450         mutex_unlock(&local->chanctx_mtx);
1451 }
1452
1453 int ieee80211_reconfig(struct ieee80211_local *local)
1454 {
1455         struct ieee80211_hw *hw = &local->hw;
1456         struct ieee80211_sub_if_data *sdata;
1457         struct ieee80211_chanctx *ctx;
1458         struct sta_info *sta;
1459         int res, i;
1460         bool reconfig_due_to_wowlan = false;
1461         struct ieee80211_sub_if_data *sched_scan_sdata;
1462         bool sched_scan_stopped = false;
1463
1464 #ifdef CONFIG_PM
1465         if (local->suspended)
1466                 local->resuming = true;
1467
1468         if (local->wowlan) {
1469                 res = drv_resume(local);
1470                 local->wowlan = false;
1471                 if (res < 0) {
1472                         local->resuming = false;
1473                         return res;
1474                 }
1475                 if (res == 0)
1476                         goto wake_up;
1477                 WARN_ON(res > 1);
1478                 /*
1479                  * res is 1, which means the driver requested
1480                  * to go through a regular reset on wakeup.
1481                  */
1482                 reconfig_due_to_wowlan = true;
1483         }
1484 #endif
1485         /* everything else happens only if HW was up & running */
1486         if (!local->open_count)
1487                 goto wake_up;
1488
1489         /*
1490          * Upon resume hardware can sometimes be goofy due to
1491          * various platform / driver / bus issues, so restarting
1492          * the device may at times not work immediately. Propagate
1493          * the error.
1494          */
1495         res = drv_start(local);
1496         if (res) {
1497                 WARN(local->suspended, "Hardware became unavailable "
1498                      "upon resume. This could be a software issue "
1499                      "prior to suspend or a hardware issue.\n");
1500                 return res;
1501         }
1502
1503         /* setup fragmentation threshold */
1504         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1505
1506         /* setup RTS threshold */
1507         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1508
1509         /* reset coverage class */
1510         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1511
1512         ieee80211_led_radio(local, true);
1513         ieee80211_mod_tpt_led_trig(local,
1514                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1515
1516         /* add interfaces */
1517         sdata = rtnl_dereference(local->monitor_sdata);
1518         if (sdata) {
1519                 /* in HW restart it exists already */
1520                 WARN_ON(local->resuming);
1521                 res = drv_add_interface(local, sdata);
1522                 if (WARN_ON(res)) {
1523                         rcu_assign_pointer(local->monitor_sdata, NULL);
1524                         synchronize_net();
1525                         kfree(sdata);
1526                 }
1527         }
1528
1529         list_for_each_entry(sdata, &local->interfaces, list) {
1530                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1531                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1532                     ieee80211_sdata_running(sdata))
1533                         res = drv_add_interface(local, sdata);
1534         }
1535
1536         /* add channel contexts */
1537         if (local->use_chanctx) {
1538                 mutex_lock(&local->chanctx_mtx);
1539                 list_for_each_entry(ctx, &local->chanctx_list, list)
1540                         WARN_ON(drv_add_chanctx(local, ctx));
1541                 mutex_unlock(&local->chanctx_mtx);
1542         }
1543
1544         list_for_each_entry(sdata, &local->interfaces, list) {
1545                 if (!ieee80211_sdata_running(sdata))
1546                         continue;
1547                 ieee80211_assign_chanctx(local, sdata);
1548         }
1549
1550         sdata = rtnl_dereference(local->monitor_sdata);
1551         if (sdata && ieee80211_sdata_running(sdata))
1552                 ieee80211_assign_chanctx(local, sdata);
1553
1554         /* add STAs back */
1555         mutex_lock(&local->sta_mtx);
1556         list_for_each_entry(sta, &local->sta_list, list) {
1557                 enum ieee80211_sta_state state;
1558
1559                 if (!sta->uploaded)
1560                         continue;
1561
1562                 /* AP-mode stations will be added later */
1563                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1564                         continue;
1565
1566                 for (state = IEEE80211_STA_NOTEXIST;
1567                      state < sta->sta_state; state++)
1568                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1569                                               state + 1));
1570         }
1571         mutex_unlock(&local->sta_mtx);
1572
1573         /* reconfigure tx conf */
1574         if (hw->queues >= IEEE80211_NUM_ACS) {
1575                 list_for_each_entry(sdata, &local->interfaces, list) {
1576                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1577                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1578                             !ieee80211_sdata_running(sdata))
1579                                 continue;
1580
1581                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1582                                 drv_conf_tx(local, sdata, i,
1583                                             &sdata->tx_conf[i]);
1584                 }
1585         }
1586
1587         /* reconfigure hardware */
1588         ieee80211_hw_config(local, ~0);
1589
1590         ieee80211_configure_filter(local);
1591
1592         /* Finally also reconfigure all the BSS information */
1593         list_for_each_entry(sdata, &local->interfaces, list) {
1594                 u32 changed;
1595
1596                 if (!ieee80211_sdata_running(sdata))
1597                         continue;
1598
1599                 /* common change flags for all interface types */
1600                 changed = BSS_CHANGED_ERP_CTS_PROT |
1601                           BSS_CHANGED_ERP_PREAMBLE |
1602                           BSS_CHANGED_ERP_SLOT |
1603                           BSS_CHANGED_HT |
1604                           BSS_CHANGED_BASIC_RATES |
1605                           BSS_CHANGED_BEACON_INT |
1606                           BSS_CHANGED_BSSID |
1607                           BSS_CHANGED_CQM |
1608                           BSS_CHANGED_QOS |
1609                           BSS_CHANGED_IDLE |
1610                           BSS_CHANGED_TXPOWER;
1611
1612                 switch (sdata->vif.type) {
1613                 case NL80211_IFTYPE_STATION:
1614                         changed |= BSS_CHANGED_ASSOC |
1615                                    BSS_CHANGED_ARP_FILTER |
1616                                    BSS_CHANGED_PS;
1617
1618                         /* Re-send beacon info report to the driver */
1619                         if (sdata->u.mgd.have_beacon)
1620                                 changed |= BSS_CHANGED_BEACON_INFO;
1621
1622                         sdata_lock(sdata);
1623                         ieee80211_bss_info_change_notify(sdata, changed);
1624                         sdata_unlock(sdata);
1625                         break;
1626                 case NL80211_IFTYPE_ADHOC:
1627                         changed |= BSS_CHANGED_IBSS;
1628                         /* fall through */
1629                 case NL80211_IFTYPE_AP:
1630                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1631
1632                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1633                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1634
1635                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1636                                         drv_start_ap(local, sdata);
1637                         }
1638
1639                         /* fall through */
1640                 case NL80211_IFTYPE_MESH_POINT:
1641                         if (sdata->vif.bss_conf.enable_beacon) {
1642                                 changed |= BSS_CHANGED_BEACON |
1643                                            BSS_CHANGED_BEACON_ENABLED;
1644                                 ieee80211_bss_info_change_notify(sdata, changed);
1645                         }
1646                         break;
1647                 case NL80211_IFTYPE_WDS:
1648                         break;
1649                 case NL80211_IFTYPE_AP_VLAN:
1650                 case NL80211_IFTYPE_MONITOR:
1651                         /* ignore virtual */
1652                         break;
1653                 case NL80211_IFTYPE_P2P_DEVICE:
1654                         changed = BSS_CHANGED_IDLE;
1655                         break;
1656                 case NL80211_IFTYPE_UNSPECIFIED:
1657                 case NUM_NL80211_IFTYPES:
1658                 case NL80211_IFTYPE_P2P_CLIENT:
1659                 case NL80211_IFTYPE_P2P_GO:
1660                         WARN_ON(1);
1661                         break;
1662                 }
1663         }
1664
1665         ieee80211_recalc_ps(local, -1);
1666
1667         /*
1668          * The sta might be in psm against the ap (e.g. because
1669          * this was the state before a hw restart), so we
1670          * explicitly send a null packet in order to make sure
1671          * it'll sync against the ap (and get out of psm).
1672          */
1673         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1674                 list_for_each_entry(sdata, &local->interfaces, list) {
1675                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1676                                 continue;
1677                         if (!sdata->u.mgd.associated)
1678                                 continue;
1679
1680                         ieee80211_send_nullfunc(local, sdata, 0);
1681                 }
1682         }
1683
1684         /* APs are now beaconing, add back stations */
1685         mutex_lock(&local->sta_mtx);
1686         list_for_each_entry(sta, &local->sta_list, list) {
1687                 enum ieee80211_sta_state state;
1688
1689                 if (!sta->uploaded)
1690                         continue;
1691
1692                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1693                         continue;
1694
1695                 for (state = IEEE80211_STA_NOTEXIST;
1696                      state < sta->sta_state; state++)
1697                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1698                                               state + 1));
1699         }
1700         mutex_unlock(&local->sta_mtx);
1701
1702         /* add back keys */
1703         list_for_each_entry(sdata, &local->interfaces, list)
1704                 if (ieee80211_sdata_running(sdata))
1705                         ieee80211_enable_keys(sdata);
1706
1707  wake_up:
1708         local->in_reconfig = false;
1709         barrier();
1710
1711         if (local->monitors == local->open_count && local->monitors > 0)
1712                 ieee80211_add_virtual_monitor(local);
1713
1714         /*
1715          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1716          * sessions can be established after a resume.
1717          *
1718          * Also tear down aggregation sessions since reconfiguring
1719          * them in a hardware restart scenario is not easily done
1720          * right now, and the hardware will have lost information
1721          * about the sessions, but we and the AP still think they
1722          * are active. This is really a workaround though.
1723          */
1724         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1725                 mutex_lock(&local->sta_mtx);
1726
1727                 list_for_each_entry(sta, &local->sta_list, list) {
1728                         ieee80211_sta_tear_down_BA_sessions(
1729                                         sta, AGG_STOP_LOCAL_REQUEST);
1730                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1731                 }
1732
1733                 mutex_unlock(&local->sta_mtx);
1734         }
1735
1736         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1737                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1738
1739         /*
1740          * Reconfigure sched scan if it was interrupted by FW restart or
1741          * suspend.
1742          */
1743         mutex_lock(&local->mtx);
1744         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1745                                                 lockdep_is_held(&local->mtx));
1746         if (sched_scan_sdata && local->sched_scan_req)
1747                 /*
1748                  * Sched scan stopped, but we don't want to report it. Instead,
1749                  * we're trying to reschedule.
1750                  */
1751                 if (__ieee80211_request_sched_scan_start(sched_scan_sdata,
1752                                                          local->sched_scan_req))
1753                         sched_scan_stopped = true;
1754         mutex_unlock(&local->mtx);
1755
1756         if (sched_scan_stopped)
1757                 cfg80211_sched_scan_stopped(local->hw.wiphy);
1758
1759         /*
1760          * If this is for hw restart things are still running.
1761          * We may want to change that later, however.
1762          */
1763         if (!local->suspended || reconfig_due_to_wowlan)
1764                 drv_restart_complete(local);
1765
1766         if (!local->suspended)
1767                 return 0;
1768
1769 #ifdef CONFIG_PM
1770         /* first set suspended false, then resuming */
1771         local->suspended = false;
1772         mb();
1773         local->resuming = false;
1774
1775         list_for_each_entry(sdata, &local->interfaces, list) {
1776                 if (!ieee80211_sdata_running(sdata))
1777                         continue;
1778                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1779                         ieee80211_sta_restart(sdata);
1780         }
1781
1782         mod_timer(&local->sta_cleanup, jiffies + 1);
1783 #else
1784         WARN_ON(1);
1785 #endif
1786
1787         return 0;
1788 }
1789
1790 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1791 {
1792         struct ieee80211_sub_if_data *sdata;
1793         struct ieee80211_local *local;
1794         struct ieee80211_key *key;
1795
1796         if (WARN_ON(!vif))
1797                 return;
1798
1799         sdata = vif_to_sdata(vif);
1800         local = sdata->local;
1801
1802         if (WARN_ON(!local->resuming))
1803                 return;
1804
1805         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1806                 return;
1807
1808         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1809
1810         mutex_lock(&local->key_mtx);
1811         list_for_each_entry(key, &sdata->key_list, list)
1812                 key->flags |= KEY_FLAG_TAINTED;
1813         mutex_unlock(&local->key_mtx);
1814 }
1815 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1816
1817 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1818 {
1819         struct ieee80211_local *local = sdata->local;
1820         struct ieee80211_chanctx_conf *chanctx_conf;
1821         struct ieee80211_chanctx *chanctx;
1822
1823         mutex_lock(&local->chanctx_mtx);
1824
1825         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1826                                         lockdep_is_held(&local->chanctx_mtx));
1827
1828         if (WARN_ON_ONCE(!chanctx_conf))
1829                 goto unlock;
1830
1831         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1832         ieee80211_recalc_smps_chanctx(local, chanctx);
1833  unlock:
1834         mutex_unlock(&local->chanctx_mtx);
1835 }
1836
1837 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
1838 {
1839         struct ieee80211_local *local = sdata->local;
1840         struct ieee80211_chanctx_conf *chanctx_conf;
1841         struct ieee80211_chanctx *chanctx;
1842
1843         mutex_lock(&local->chanctx_mtx);
1844
1845         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1846                                         lockdep_is_held(&local->chanctx_mtx));
1847
1848         if (WARN_ON_ONCE(!chanctx_conf))
1849                 goto unlock;
1850
1851         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1852         ieee80211_recalc_chanctx_min_def(local, chanctx);
1853  unlock:
1854         mutex_unlock(&local->chanctx_mtx);
1855 }
1856
1857 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1858 {
1859         int i;
1860
1861         for (i = 0; i < n_ids; i++)
1862                 if (ids[i] == id)
1863                         return true;
1864         return false;
1865 }
1866
1867 /**
1868  * ieee80211_ie_split - split an IE buffer according to ordering
1869  *
1870  * @ies: the IE buffer
1871  * @ielen: the length of the IE buffer
1872  * @ids: an array with element IDs that are allowed before
1873  *      the split
1874  * @n_ids: the size of the element ID array
1875  * @offset: offset where to start splitting in the buffer
1876  *
1877  * This function splits an IE buffer by updating the @offset
1878  * variable to point to the location where the buffer should be
1879  * split.
1880  *
1881  * It assumes that the given IE buffer is well-formed, this
1882  * has to be guaranteed by the caller!
1883  *
1884  * It also assumes that the IEs in the buffer are ordered
1885  * correctly, if not the result of using this function will not
1886  * be ordered correctly either, i.e. it does no reordering.
1887  *
1888  * The function returns the offset where the next part of the
1889  * buffer starts, which may be @ielen if the entire (remainder)
1890  * of the buffer should be used.
1891  */
1892 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1893                           const u8 *ids, int n_ids, size_t offset)
1894 {
1895         size_t pos = offset;
1896
1897         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1898                 pos += 2 + ies[pos + 1];
1899
1900         return pos;
1901 }
1902
1903 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1904 {
1905         size_t pos = offset;
1906
1907         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1908                 pos += 2 + ies[pos + 1];
1909
1910         return pos;
1911 }
1912
1913 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1914                                             int rssi_min_thold,
1915                                             int rssi_max_thold)
1916 {
1917         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1918
1919         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1920                 return;
1921
1922         /*
1923          * Scale up threshold values before storing it, as the RSSI averaging
1924          * algorithm uses a scaled up value as well. Change this scaling
1925          * factor if the RSSI averaging algorithm changes.
1926          */
1927         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1928         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1929 }
1930
1931 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1932                                     int rssi_min_thold,
1933                                     int rssi_max_thold)
1934 {
1935         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1936
1937         WARN_ON(rssi_min_thold == rssi_max_thold ||
1938                 rssi_min_thold > rssi_max_thold);
1939
1940         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1941                                        rssi_max_thold);
1942 }
1943 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1944
1945 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1946 {
1947         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1948
1949         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1950 }
1951 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1952
1953 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1954                               u16 cap)
1955 {
1956         __le16 tmp;
1957
1958         *pos++ = WLAN_EID_HT_CAPABILITY;
1959         *pos++ = sizeof(struct ieee80211_ht_cap);
1960         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1961
1962         /* capability flags */
1963         tmp = cpu_to_le16(cap);
1964         memcpy(pos, &tmp, sizeof(u16));
1965         pos += sizeof(u16);
1966
1967         /* AMPDU parameters */
1968         *pos++ = ht_cap->ampdu_factor |
1969                  (ht_cap->ampdu_density <<
1970                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1971
1972         /* MCS set */
1973         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1974         pos += sizeof(ht_cap->mcs);
1975
1976         /* extended capabilities */
1977         pos += sizeof(__le16);
1978
1979         /* BF capabilities */
1980         pos += sizeof(__le32);
1981
1982         /* antenna selection */
1983         pos += sizeof(u8);
1984
1985         return pos;
1986 }
1987
1988 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1989                                u32 cap)
1990 {
1991         __le32 tmp;
1992
1993         *pos++ = WLAN_EID_VHT_CAPABILITY;
1994         *pos++ = sizeof(struct ieee80211_vht_cap);
1995         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1996
1997         /* capability flags */
1998         tmp = cpu_to_le32(cap);
1999         memcpy(pos, &tmp, sizeof(u32));
2000         pos += sizeof(u32);
2001
2002         /* VHT MCS set */
2003         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2004         pos += sizeof(vht_cap->vht_mcs);
2005
2006         return pos;
2007 }
2008
2009 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2010                                const struct cfg80211_chan_def *chandef,
2011                                u16 prot_mode)
2012 {
2013         struct ieee80211_ht_operation *ht_oper;
2014         /* Build HT Information */
2015         *pos++ = WLAN_EID_HT_OPERATION;
2016         *pos++ = sizeof(struct ieee80211_ht_operation);
2017         ht_oper = (struct ieee80211_ht_operation *)pos;
2018         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2019                                         chandef->chan->center_freq);
2020         switch (chandef->width) {
2021         case NL80211_CHAN_WIDTH_160:
2022         case NL80211_CHAN_WIDTH_80P80:
2023         case NL80211_CHAN_WIDTH_80:
2024         case NL80211_CHAN_WIDTH_40:
2025                 if (chandef->center_freq1 > chandef->chan->center_freq)
2026                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2027                 else
2028                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2029                 break;
2030         default:
2031                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2032                 break;
2033         }
2034         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2035             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2036             chandef->width != NL80211_CHAN_WIDTH_20)
2037                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2038
2039         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2040         ht_oper->stbc_param = 0x0000;
2041
2042         /* It seems that Basic MCS set and Supported MCS set
2043            are identical for the first 10 bytes */
2044         memset(&ht_oper->basic_set, 0, 16);
2045         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2046
2047         return pos + sizeof(struct ieee80211_ht_operation);
2048 }
2049
2050 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2051                                   const struct ieee80211_ht_operation *ht_oper,
2052                                   struct cfg80211_chan_def *chandef)
2053 {
2054         enum nl80211_channel_type channel_type;
2055
2056         if (!ht_oper) {
2057                 cfg80211_chandef_create(chandef, control_chan,
2058                                         NL80211_CHAN_NO_HT);
2059                 return;
2060         }
2061
2062         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2063         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2064                 channel_type = NL80211_CHAN_HT20;
2065                 break;
2066         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2067                 channel_type = NL80211_CHAN_HT40PLUS;
2068                 break;
2069         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2070                 channel_type = NL80211_CHAN_HT40MINUS;
2071                 break;
2072         default:
2073                 channel_type = NL80211_CHAN_NO_HT;
2074         }
2075
2076         cfg80211_chandef_create(chandef, control_chan, channel_type);
2077 }
2078
2079 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2080                              const struct ieee80211_supported_band *sband,
2081                              const u8 *srates, int srates_len, u32 *rates)
2082 {
2083         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2084         int shift = ieee80211_chandef_get_shift(chandef);
2085         struct ieee80211_rate *br;
2086         int brate, rate, i, j, count = 0;
2087
2088         *rates = 0;
2089
2090         for (i = 0; i < srates_len; i++) {
2091                 rate = srates[i] & 0x7f;
2092
2093                 for (j = 0; j < sband->n_bitrates; j++) {
2094                         br = &sband->bitrates[j];
2095                         if ((rate_flags & br->flags) != rate_flags)
2096                                 continue;
2097
2098                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2099                         if (brate == rate) {
2100                                 *rates |= BIT(j);
2101                                 count++;
2102                                 break;
2103                         }
2104                 }
2105         }
2106         return count;
2107 }
2108
2109 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2110                             struct sk_buff *skb, bool need_basic,
2111                             enum ieee80211_band band)
2112 {
2113         struct ieee80211_local *local = sdata->local;
2114         struct ieee80211_supported_band *sband;
2115         int rate, shift;
2116         u8 i, rates, *pos;
2117         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2118         u32 rate_flags;
2119
2120         shift = ieee80211_vif_get_shift(&sdata->vif);
2121         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2122         sband = local->hw.wiphy->bands[band];
2123         rates = 0;
2124         for (i = 0; i < sband->n_bitrates; i++) {
2125                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2126                         continue;
2127                 rates++;
2128         }
2129         if (rates > 8)
2130                 rates = 8;
2131
2132         if (skb_tailroom(skb) < rates + 2)
2133                 return -ENOMEM;
2134
2135         pos = skb_put(skb, rates + 2);
2136         *pos++ = WLAN_EID_SUPP_RATES;
2137         *pos++ = rates;
2138         for (i = 0; i < rates; i++) {
2139                 u8 basic = 0;
2140                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2141                         continue;
2142
2143                 if (need_basic && basic_rates & BIT(i))
2144                         basic = 0x80;
2145                 rate = sband->bitrates[i].bitrate;
2146                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2147                                     5 * (1 << shift));
2148                 *pos++ = basic | (u8) rate;
2149         }
2150
2151         return 0;
2152 }
2153
2154 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2155                                 struct sk_buff *skb, bool need_basic,
2156                                 enum ieee80211_band band)
2157 {
2158         struct ieee80211_local *local = sdata->local;
2159         struct ieee80211_supported_band *sband;
2160         int rate, shift;
2161         u8 i, exrates, *pos;
2162         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2163         u32 rate_flags;
2164
2165         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2166         shift = ieee80211_vif_get_shift(&sdata->vif);
2167
2168         sband = local->hw.wiphy->bands[band];
2169         exrates = 0;
2170         for (i = 0; i < sband->n_bitrates; i++) {
2171                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2172                         continue;
2173                 exrates++;
2174         }
2175
2176         if (exrates > 8)
2177                 exrates -= 8;
2178         else
2179                 exrates = 0;
2180
2181         if (skb_tailroom(skb) < exrates + 2)
2182                 return -ENOMEM;
2183
2184         if (exrates) {
2185                 pos = skb_put(skb, exrates + 2);
2186                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2187                 *pos++ = exrates;
2188                 for (i = 8; i < sband->n_bitrates; i++) {
2189                         u8 basic = 0;
2190                         if ((rate_flags & sband->bitrates[i].flags)
2191                             != rate_flags)
2192                                 continue;
2193                         if (need_basic && basic_rates & BIT(i))
2194                                 basic = 0x80;
2195                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2196                                             5 * (1 << shift));
2197                         *pos++ = basic | (u8) rate;
2198                 }
2199         }
2200         return 0;
2201 }
2202
2203 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2204 {
2205         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2206         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2207
2208         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2209                 /* non-managed type inferfaces */
2210                 return 0;
2211         }
2212         return ifmgd->ave_beacon_signal / 16;
2213 }
2214 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2215
2216 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2217 {
2218         if (!mcs)
2219                 return 1;
2220
2221         /* TODO: consider rx_highest */
2222
2223         if (mcs->rx_mask[3])
2224                 return 4;
2225         if (mcs->rx_mask[2])
2226                 return 3;
2227         if (mcs->rx_mask[1])
2228                 return 2;
2229         return 1;
2230 }
2231
2232 /**
2233  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2234  * @local: mac80211 hw info struct
2235  * @status: RX status
2236  * @mpdu_len: total MPDU length (including FCS)
2237  * @mpdu_offset: offset into MPDU to calculate timestamp at
2238  *
2239  * This function calculates the RX timestamp at the given MPDU offset, taking
2240  * into account what the RX timestamp was. An offset of 0 will just normalize
2241  * the timestamp to TSF at beginning of MPDU reception.
2242  */
2243 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2244                                      struct ieee80211_rx_status *status,
2245                                      unsigned int mpdu_len,
2246                                      unsigned int mpdu_offset)
2247 {
2248         u64 ts = status->mactime;
2249         struct rate_info ri;
2250         u16 rate;
2251
2252         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2253                 return 0;
2254
2255         memset(&ri, 0, sizeof(ri));
2256
2257         /* Fill cfg80211 rate info */
2258         if (status->flag & RX_FLAG_HT) {
2259                 ri.mcs = status->rate_idx;
2260                 ri.flags |= RATE_INFO_FLAGS_MCS;
2261                 if (status->flag & RX_FLAG_40MHZ)
2262                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2263                 if (status->flag & RX_FLAG_SHORT_GI)
2264                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2265         } else if (status->flag & RX_FLAG_VHT) {
2266                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2267                 ri.mcs = status->rate_idx;
2268                 ri.nss = status->vht_nss;
2269                 if (status->flag & RX_FLAG_40MHZ)
2270                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2271                 if (status->flag & RX_FLAG_80MHZ)
2272                         ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2273                 if (status->flag & RX_FLAG_80P80MHZ)
2274                         ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2275                 if (status->flag & RX_FLAG_160MHZ)
2276                         ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2277                 if (status->flag & RX_FLAG_SHORT_GI)
2278                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2279         } else {
2280                 struct ieee80211_supported_band *sband;
2281                 int shift = 0;
2282                 int bitrate;
2283
2284                 if (status->flag & RX_FLAG_10MHZ)
2285                         shift = 1;
2286                 if (status->flag & RX_FLAG_5MHZ)
2287                         shift = 2;
2288
2289                 sband = local->hw.wiphy->bands[status->band];
2290                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2291                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2292         }
2293
2294         rate = cfg80211_calculate_bitrate(&ri);
2295         if (WARN_ONCE(!rate,
2296                       "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2297                       status->flag, status->rate_idx, status->vht_nss))
2298                 return 0;
2299
2300         /* rewind from end of MPDU */
2301         if (status->flag & RX_FLAG_MACTIME_END)
2302                 ts -= mpdu_len * 8 * 10 / rate;
2303
2304         ts += mpdu_offset * 8 * 10 / rate;
2305
2306         return ts;
2307 }
2308
2309 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2310 {
2311         struct ieee80211_sub_if_data *sdata;
2312         struct cfg80211_chan_def chandef;
2313
2314         mutex_lock(&local->mtx);
2315         mutex_lock(&local->iflist_mtx);
2316         list_for_each_entry(sdata, &local->interfaces, list) {
2317                 /* it might be waiting for the local->mtx, but then
2318                  * by the time it gets it, sdata->wdev.cac_started
2319                  * will no longer be true
2320                  */
2321                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2322
2323                 if (sdata->wdev.cac_started) {
2324                         chandef = sdata->vif.bss_conf.chandef;
2325                         ieee80211_vif_release_channel(sdata);
2326                         cfg80211_cac_event(sdata->dev,
2327                                            &chandef,
2328                                            NL80211_RADAR_CAC_ABORTED,
2329                                            GFP_KERNEL);
2330                 }
2331         }
2332         mutex_unlock(&local->iflist_mtx);
2333         mutex_unlock(&local->mtx);
2334 }
2335
2336 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2337 {
2338         struct ieee80211_local *local =
2339                 container_of(work, struct ieee80211_local, radar_detected_work);
2340         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2341
2342         ieee80211_dfs_cac_cancel(local);
2343
2344         if (local->use_chanctx)
2345                 /* currently not handled */
2346                 WARN_ON(1);
2347         else
2348                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2349 }
2350
2351 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2352 {
2353         struct ieee80211_local *local = hw_to_local(hw);
2354
2355         trace_api_radar_detected(local);
2356
2357         ieee80211_queue_work(hw, &local->radar_detected_work);
2358 }
2359 EXPORT_SYMBOL(ieee80211_radar_detected);
2360
2361 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2362 {
2363         u32 ret;
2364         int tmp;
2365
2366         switch (c->width) {
2367         case NL80211_CHAN_WIDTH_20:
2368                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2369                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2370                 break;
2371         case NL80211_CHAN_WIDTH_40:
2372                 c->width = NL80211_CHAN_WIDTH_20;
2373                 c->center_freq1 = c->chan->center_freq;
2374                 ret = IEEE80211_STA_DISABLE_40MHZ |
2375                       IEEE80211_STA_DISABLE_VHT;
2376                 break;
2377         case NL80211_CHAN_WIDTH_80:
2378                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2379                 /* n_P40 */
2380                 tmp /= 2;
2381                 /* freq_P40 */
2382                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2383                 c->width = NL80211_CHAN_WIDTH_40;
2384                 ret = IEEE80211_STA_DISABLE_VHT;
2385                 break;
2386         case NL80211_CHAN_WIDTH_80P80:
2387                 c->center_freq2 = 0;
2388                 c->width = NL80211_CHAN_WIDTH_80;
2389                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2390                       IEEE80211_STA_DISABLE_160MHZ;
2391                 break;
2392         case NL80211_CHAN_WIDTH_160:
2393                 /* n_P20 */
2394                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2395                 /* n_P80 */
2396                 tmp /= 4;
2397                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2398                 c->width = NL80211_CHAN_WIDTH_80;
2399                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2400                       IEEE80211_STA_DISABLE_160MHZ;
2401                 break;
2402         default:
2403         case NL80211_CHAN_WIDTH_20_NOHT:
2404                 WARN_ON_ONCE(1);
2405                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2406                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2407                 break;
2408         case NL80211_CHAN_WIDTH_5:
2409         case NL80211_CHAN_WIDTH_10:
2410                 WARN_ON_ONCE(1);
2411                 /* keep c->width */
2412                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2413                 break;
2414         }
2415
2416         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2417
2418         return ret;
2419 }
2420
2421 /*
2422  * Returns true if smps_mode_new is strictly more restrictive than
2423  * smps_mode_old.
2424  */
2425 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2426                                    enum ieee80211_smps_mode smps_mode_new)
2427 {
2428         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2429                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2430                 return false;
2431
2432         switch (smps_mode_old) {
2433         case IEEE80211_SMPS_STATIC:
2434                 return false;
2435         case IEEE80211_SMPS_DYNAMIC:
2436                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2437         case IEEE80211_SMPS_OFF:
2438                 return smps_mode_new != IEEE80211_SMPS_OFF;
2439         default:
2440                 WARN_ON(1);
2441         }
2442
2443         return false;
2444 }
2445
2446 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2447                               struct cfg80211_csa_settings *csa_settings)
2448 {
2449         struct sk_buff *skb;
2450         struct ieee80211_mgmt *mgmt;
2451         struct ieee80211_local *local = sdata->local;
2452         int freq;
2453         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2454                                sizeof(mgmt->u.action.u.chan_switch);
2455         u8 *pos;
2456
2457         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2458             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2459                 return -EOPNOTSUPP;
2460
2461         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2462                             5 + /* channel switch announcement element */
2463                             3 + /* secondary channel offset element */
2464                             8); /* mesh channel switch parameters element */
2465         if (!skb)
2466                 return -ENOMEM;
2467
2468         skb_reserve(skb, local->tx_headroom);
2469         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2470         memset(mgmt, 0, hdr_len);
2471         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2472                                           IEEE80211_STYPE_ACTION);
2473
2474         eth_broadcast_addr(mgmt->da);
2475         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2476         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2477                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2478         } else {
2479                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2480                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2481         }
2482         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2483         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2484         pos = skb_put(skb, 5);
2485         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
2486         *pos++ = 3;                                             /* IE length */
2487         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
2488         freq = csa_settings->chandef.chan->center_freq;
2489         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
2490         *pos++ = csa_settings->count;                           /* count */
2491
2492         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2493                 enum nl80211_channel_type ch_type;
2494
2495                 skb_put(skb, 3);
2496                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
2497                 *pos++ = 1;                                     /* IE length */
2498                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2499                 if (ch_type == NL80211_CHAN_HT40PLUS)
2500                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2501                 else
2502                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2503         }
2504
2505         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2506                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2507
2508                 skb_put(skb, 8);
2509                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
2510                 *pos++ = 6;                                     /* IE length */
2511                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
2512                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
2513                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2514                 *pos++ |= csa_settings->block_tx ?
2515                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2516                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2517                 pos += 2;
2518                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2519                 pos += 2;
2520         }
2521
2522         ieee80211_tx_skb(sdata, skb);
2523         return 0;
2524 }
2525
2526 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2527 {
2528         return !(cs == NULL || cs->cipher == 0 ||
2529                  cs->hdr_len < cs->pn_len + cs->pn_off ||
2530                  cs->hdr_len <= cs->key_idx_off ||
2531                  cs->key_idx_shift > 7 ||
2532                  cs->key_idx_mask == 0);
2533 }
2534
2535 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2536 {
2537         int i;
2538
2539         /* Ensure we have enough iftype bitmap space for all iftype values */
2540         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2541
2542         for (i = 0; i < n; i++)
2543                 if (!ieee80211_cs_valid(&cs[i]))
2544                         return false;
2545
2546         return true;
2547 }
2548
2549 const struct ieee80211_cipher_scheme *
2550 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2551                  enum nl80211_iftype iftype)
2552 {
2553         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2554         int n = local->hw.n_cipher_schemes;
2555         int i;
2556         const struct ieee80211_cipher_scheme *cs = NULL;
2557
2558         for (i = 0; i < n; i++) {
2559                 if (l[i].cipher == cipher) {
2560                         cs = &l[i];
2561                         break;
2562                 }
2563         }
2564
2565         if (!cs || !(cs->iftype & BIT(iftype)))
2566                 return NULL;
2567
2568         return cs;
2569 }
2570
2571 int ieee80211_cs_headroom(struct ieee80211_local *local,
2572                           struct cfg80211_crypto_settings *crypto,
2573                           enum nl80211_iftype iftype)
2574 {
2575         const struct ieee80211_cipher_scheme *cs;
2576         int headroom = IEEE80211_ENCRYPT_HEADROOM;
2577         int i;
2578
2579         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
2580                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
2581                                       iftype);
2582
2583                 if (cs && headroom < cs->hdr_len)
2584                         headroom = cs->hdr_len;
2585         }
2586
2587         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
2588         if (cs && headroom < cs->hdr_len)
2589                 headroom = cs->hdr_len;
2590
2591         return headroom;
2592 }
2593
2594 static bool
2595 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
2596 {
2597         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
2598         int skip;
2599
2600         if (end > 0)
2601                 return false;
2602
2603         /* End time is in the past, check for repetitions */
2604         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
2605         if (data->count[i] < 255) {
2606                 if (data->count[i] <= skip) {
2607                         data->count[i] = 0;
2608                         return false;
2609                 }
2610
2611                 data->count[i] -= skip;
2612         }
2613
2614         data->desc[i].start += skip * data->desc[i].interval;
2615
2616         return true;
2617 }
2618
2619 static bool
2620 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
2621                              s32 *offset)
2622 {
2623         bool ret = false;
2624         int i;
2625
2626         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2627                 s32 cur;
2628
2629                 if (!data->count[i])
2630                         continue;
2631
2632                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
2633                         ret = true;
2634
2635                 cur = data->desc[i].start - tsf;
2636                 if (cur > *offset)
2637                         continue;
2638
2639                 cur = data->desc[i].start + data->desc[i].duration - tsf;
2640                 if (cur > *offset)
2641                         *offset = cur;
2642         }
2643
2644         return ret;
2645 }
2646
2647 static u32
2648 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
2649 {
2650         s32 offset = 0;
2651         int tries = 0;
2652         /*
2653          * arbitrary limit, used to avoid infinite loops when combined NoA
2654          * descriptors cover the full time period.
2655          */
2656         int max_tries = 5;
2657
2658         ieee80211_extend_absent_time(data, tsf, &offset);
2659         do {
2660                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
2661                         break;
2662
2663                 tries++;
2664         } while (tries < max_tries);
2665
2666         return offset;
2667 }
2668
2669 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
2670 {
2671         u32 next_offset = BIT(31) - 1;
2672         int i;
2673
2674         data->absent = 0;
2675         data->has_next_tsf = false;
2676         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2677                 s32 start;
2678
2679                 if (!data->count[i])
2680                         continue;
2681
2682                 ieee80211_extend_noa_desc(data, tsf, i);
2683                 start = data->desc[i].start - tsf;
2684                 if (start <= 0)
2685                         data->absent |= BIT(i);
2686
2687                 if (next_offset > start)
2688                         next_offset = start;
2689
2690                 data->has_next_tsf = true;
2691         }
2692
2693         if (data->absent)
2694                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
2695
2696         data->next_tsf = tsf + next_offset;
2697 }
2698 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
2699
2700 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
2701                             struct ieee80211_noa_data *data, u32 tsf)
2702 {
2703         int ret = 0;
2704         int i;
2705
2706         memset(data, 0, sizeof(*data));
2707
2708         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
2709                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
2710
2711                 if (!desc->count || !desc->duration)
2712                         continue;
2713
2714                 data->count[i] = desc->count;
2715                 data->desc[i].start = le32_to_cpu(desc->start_time);
2716                 data->desc[i].duration = le32_to_cpu(desc->duration);
2717                 data->desc[i].interval = le32_to_cpu(desc->interval);
2718
2719                 if (data->count[i] > 1 &&
2720                     data->desc[i].interval < data->desc[i].duration)
2721                         continue;
2722
2723                 ieee80211_extend_noa_desc(data, tsf, i);
2724                 ret++;
2725         }
2726
2727         if (ret)
2728                 ieee80211_update_p2p_noa(data, tsf);
2729
2730         return ret;
2731 }
2732 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
2733
2734 void ieee80211_recalc_dtim(struct ieee80211_local *local,
2735                            struct ieee80211_sub_if_data *sdata)
2736 {
2737         u64 tsf = drv_get_tsf(local, sdata);
2738         u64 dtim_count = 0;
2739         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
2740         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
2741         struct ps_data *ps;
2742         u8 bcns_from_dtim;
2743
2744         if (tsf == -1ULL || !beacon_int || !dtim_period)
2745                 return;
2746
2747         if (sdata->vif.type == NL80211_IFTYPE_AP ||
2748             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
2749                 if (!sdata->bss)
2750                         return;
2751
2752                 ps = &sdata->bss->ps;
2753         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2754                 ps = &sdata->u.mesh.ps;
2755         } else {
2756                 return;
2757         }
2758
2759         /*
2760          * actually finds last dtim_count, mac80211 will update in
2761          * __beacon_add_tim().
2762          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
2763          */
2764         do_div(tsf, beacon_int);
2765         bcns_from_dtim = do_div(tsf, dtim_period);
2766         /* just had a DTIM */
2767         if (!bcns_from_dtim)
2768                 dtim_count = 0;
2769         else
2770                 dtim_count = dtim_period - bcns_from_dtim;
2771
2772         ps->dtim_count = dtim_count;
2773 }