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 {
 112         int dur;
 113
 114         /* calculate duration (in microseconds, rounded up to next higher
 115          * integer if it includes a fractional microsecond) to send frame of
 116          * len bytes (does not include FCS) at the given rate. Duration will
 117          * also include SIFS.
 118          *
 119          * rate is in 100 kbps, so divident is multiplied by 10 in the
 120          * DIV_ROUND_UP() operations.
 121          */
 122
 123         if (band == IEEE80211_BAND_5GHZ || erp) {
 124                 /*
 125                  * OFDM:
 126                  *
 127                  * N_DBPS = DATARATE x 4
 128                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 129                  *      (16 = SIGNAL time, 6 = tail bits)
 130                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 131                  *
 132                  * T_SYM = 4 usec
 133                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 134                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 135                  *      signal ext = 6 usec
 136                  */
 137                 dur = 16; /* SIFS + signal ext */
 138                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 139                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 140                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 141                                         4 * rate); /* T_SYM x N_SYM */
 142         } else {
 143                 /*
 144                  * 802.11b or 802.11g with 802.11b compatibility:
 145                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 146                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 147                  *
 148                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 149                  * aSIFSTime = 10 usec
 150                  * aPreambleLength = 144 usec or 72 usec with short preamble
 151                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 152                  */
 153                 dur = 10; /* aSIFSTime = 10 usec */
 154                 dur += short_preamble ? (72 + 24) : (144 + 48);
 155
 156                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 157         }
 158
 159         return dur;
 160 }
 161
 162 /* Exported duration function for driver use */
 163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 164                                         struct ieee80211_vif *vif,
 165                                         enum ieee80211_band band,
 166                                         size_t frame_len,
 167                                         struct ieee80211_rate *rate)
 168 {
 169         struct ieee80211_sub_if_data *sdata;
 170         u16 dur;
 171         int erp;
 172         bool short_preamble = false;
 173
 174         erp = 0;
 175         if (vif) {
 176                 sdata = vif_to_sdata(vif);
 177                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 178                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 179                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 180         }
 181
 182         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 183                                        short_preamble);
 184
 185         return cpu_to_le16(dur);
 186 }
 187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 188
 189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 190                               struct ieee80211_vif *vif, size_t frame_len,
 191                               const struct ieee80211_tx_info *frame_txctl)
 192 {
 193         struct ieee80211_local *local = hw_to_local(hw);
 194         struct ieee80211_rate *rate;
 195         struct ieee80211_sub_if_data *sdata;
 196         bool short_preamble;
 197         int erp;
 198         u16 dur;
 199         struct ieee80211_supported_band *sband;
 200
 201         sband = local->hw.wiphy->bands[frame_txctl->band];
 202
 203         short_preamble = false;
 204
 205         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 206
 207         erp = 0;
 208         if (vif) {
 209                 sdata = vif_to_sdata(vif);
 210                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 211                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 212                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 213         }
 214
 215         /* CTS duration */
 216         dur = ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 217                                        erp, short_preamble);
 218         /* Data frame duration */
 219         dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
 220                                         erp, short_preamble);
 221         /* ACK duration */
 222         dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 223                                         erp, short_preamble);
 224
 225         return cpu_to_le16(dur);
 226 }
 227 EXPORT_SYMBOL(ieee80211_rts_duration);
 228
 229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 230                                     struct ieee80211_vif *vif,
 231                                     size_t frame_len,
 232                                     const struct ieee80211_tx_info *frame_txctl)
 233 {
 234         struct ieee80211_local *local = hw_to_local(hw);
 235         struct ieee80211_rate *rate;
 236         struct ieee80211_sub_if_data *sdata;
 237         bool short_preamble;
 238         int erp;
 239         u16 dur;
 240         struct ieee80211_supported_band *sband;
 241
 242         sband = local->hw.wiphy->bands[frame_txctl->band];
 243
 244         short_preamble = false;
 245
 246         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 247         erp = 0;
 248         if (vif) {
 249                 sdata = vif_to_sdata(vif);
 250                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 251                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 252                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 253         }
 254
 255         /* Data frame duration */
 256         dur = ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
 257                                        erp, short_preamble);
 258         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 259                 /* ACK duration */
 260                 dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 261                                                 erp, short_preamble);
 262         }
 263
 264         return cpu_to_le16(dur);
 265 }
 266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 269 {
 270         struct ieee80211_sub_if_data *sdata;
 271         int n_acs = IEEE80211_NUM_ACS;
 272
 273         if (local->hw.queues < IEEE80211_NUM_ACS)
 274                 n_acs = 1;
 275
 276         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 277                 int ac;
 278
 279                 if (!sdata->dev)
 280                         continue;
 281
 282                 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 283                         continue;
 284
 285                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 286                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 287                         continue;
 288
 289                 for (ac = 0; ac < n_acs; ac++) {
 290                         int ac_queue = sdata->vif.hw_queue[ac];
 291
 292                         if (ac_queue == queue ||
 293                             (sdata->vif.cab_queue == queue &&
 294                              local->queue_stop_reasons[ac_queue] == 0 &&
 295                              skb_queue_empty(&local->pending[ac_queue])))
 296                                 netif_wake_subqueue(sdata->dev, ac);
 297                 }
 298         }
 299 }
 300
 301 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 302                                    enum queue_stop_reason reason)
 303 {
 304         struct ieee80211_local *local = hw_to_local(hw);
 305
 306         trace_wake_queue(local, queue, reason);
 307
 308         if (WARN_ON(queue >= hw->queues))
 309                 return;
 310
 311         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 312                 return;
 313
 314         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 315
 316         if (local->queue_stop_reasons[queue] != 0)
 317                 /* someone still has this queue stopped */
 318                 return;
 319
 320         if (skb_queue_empty(&local->pending[queue])) {
 321                 rcu_read_lock();
 322                 ieee80211_propagate_queue_wake(local, queue);
 323                 rcu_read_unlock();
 324         } else
 325                 tasklet_schedule(&local->tx_pending_tasklet);
 326 }
 327
 328 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 329                                     enum queue_stop_reason reason)
 330 {
 331         struct ieee80211_local *local = hw_to_local(hw);
 332         unsigned long flags;
 333
 334         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 335         __ieee80211_wake_queue(hw, queue, reason);
 336         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 337 }
 338
 339 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 340 {
 341         ieee80211_wake_queue_by_reason(hw, queue,
 342                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 343 }
 344 EXPORT_SYMBOL(ieee80211_wake_queue);
 345
 346 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 347                                    enum queue_stop_reason reason)
 348 {
 349         struct ieee80211_local *local = hw_to_local(hw);
 350         struct ieee80211_sub_if_data *sdata;
 351         int n_acs = IEEE80211_NUM_ACS;
 352
 353         trace_stop_queue(local, queue, reason);
 354
 355         if (WARN_ON(queue >= hw->queues))
 356                 return;
 357
 358         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 359                 return;
 360
 361         __set_bit(reason, &local->queue_stop_reasons[queue]);
 362
 363         if (local->hw.queues < IEEE80211_NUM_ACS)
 364                 n_acs = 1;
 365
 366         rcu_read_lock();
 367         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 368                 int ac;
 369
 370                 if (!sdata->dev)
 371                         continue;
 372
 373                 for (ac = 0; ac < n_acs; ac++) {
 374                         if (sdata->vif.hw_queue[ac] == queue ||
 375                             sdata->vif.cab_queue == queue)
 376                                 netif_stop_subqueue(sdata->dev, ac);
 377                 }
 378         }
 379         rcu_read_unlock();
 380 }
 381
 382 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 383                                     enum queue_stop_reason reason)
 384 {
 385         struct ieee80211_local *local = hw_to_local(hw);
 386         unsigned long flags;
 387
 388         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 389         __ieee80211_stop_queue(hw, queue, reason);
 390         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 391 }
 392
 393 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 394 {
 395         ieee80211_stop_queue_by_reason(hw, queue,
 396                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 397 }
 398 EXPORT_SYMBOL(ieee80211_stop_queue);
 399
 400 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 401                                struct sk_buff *skb)
 402 {
 403         struct ieee80211_hw *hw = &local->hw;
 404         unsigned long flags;
 405         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 406         int queue = info->hw_queue;
 407
 408         if (WARN_ON(!info->control.vif)) {
 409                 ieee80211_free_txskb(&local->hw, skb);
 410                 return;
 411         }
 412
 413         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 414         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 415         __skb_queue_tail(&local->pending[queue], skb);
 416         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 417         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 418 }
 419
 420 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 421                                    struct sk_buff_head *skbs,
 422                                    void (*fn)(void *data), void *data)
 423 {
 424         struct ieee80211_hw *hw = &local->hw;
 425         struct sk_buff *skb;
 426         unsigned long flags;
 427         int queue, i;
 428
 429         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 430         while ((skb = skb_dequeue(skbs))) {
 431                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 432
 433                 if (WARN_ON(!info->control.vif)) {
 434                         ieee80211_free_txskb(&local->hw, skb);
 435                         continue;
 436                 }
 437
 438                 queue = info->hw_queue;
 439
 440                 __ieee80211_stop_queue(hw, queue,
 441                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 442
 443                 __skb_queue_tail(&local->pending[queue], skb);
 444         }
 445
 446         if (fn)
 447                 fn(data);
 448
 449         for (i = 0; i < hw->queues; i++)
 450                 __ieee80211_wake_queue(hw, i,
 451                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 452         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 453 }
 454
 455 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 456                                      unsigned long queues,
 457                                      enum queue_stop_reason reason)
 458 {
 459         struct ieee80211_local *local = hw_to_local(hw);
 460         unsigned long flags;
 461         int i;
 462
 463         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 464
 465         for_each_set_bit(i, &queues, hw->queues)
 466                 __ieee80211_stop_queue(hw, i, reason);
 467
 468         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 469 }
 470
 471 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 472 {
 473         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 474                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 475 }
 476 EXPORT_SYMBOL(ieee80211_stop_queues);
 477
 478 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 479 {
 480         struct ieee80211_local *local = hw_to_local(hw);
 481         unsigned long flags;
 482         int ret;
 483
 484         if (WARN_ON(queue >= hw->queues))
 485                 return true;
 486
 487         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 488         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 489                        &local->queue_stop_reasons[queue]);
 490         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 491         return ret;
 492 }
 493 EXPORT_SYMBOL(ieee80211_queue_stopped);
 494
 495 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 496                                      unsigned long queues,
 497                                      enum queue_stop_reason reason)
 498 {
 499         struct ieee80211_local *local = hw_to_local(hw);
 500         unsigned long flags;
 501         int i;
 502
 503         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 504
 505         for_each_set_bit(i, &queues, hw->queues)
 506                 __ieee80211_wake_queue(hw, i, reason);
 507
 508         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 509 }
 510
 511 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 512 {
 513         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 514                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 515 }
 516 EXPORT_SYMBOL(ieee80211_wake_queues);
 517
 518 void ieee80211_flush_queues(struct ieee80211_local *local,
 519                             struct ieee80211_sub_if_data *sdata)
 520 {
 521         u32 queues;
 522
 523         if (!local->ops->flush)
 524                 return;
 525
 526         if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
 527                 int ac;
 528
 529                 queues = 0;
 530
 531                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 532                         queues |= BIT(sdata->vif.hw_queue[ac]);
 533                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 534                         queues |= BIT(sdata->vif.cab_queue);
 535         } else {
 536                 /* all queues */
 537                 queues = BIT(local->hw.queues) - 1;
 538         }
 539
 540         ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 541                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 542
 543         drv_flush(local, queues, false);
 544
 545         ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 546                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 547 }
 548
 549 void ieee80211_iterate_active_interfaces(
 550         struct ieee80211_hw *hw, u32 iter_flags,
 551         void (*iterator)(void *data, u8 *mac,
 552                          struct ieee80211_vif *vif),
 553         void *data)
 554 {
 555         struct ieee80211_local *local = hw_to_local(hw);
 556         struct ieee80211_sub_if_data *sdata;
 557
 558         mutex_lock(&local->iflist_mtx);
 559
 560         list_for_each_entry(sdata, &local->interfaces, list) {
 561                 switch (sdata->vif.type) {
 562                 case NL80211_IFTYPE_MONITOR:
 563                         if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 564                                 continue;
 565                         break;
 566                 case NL80211_IFTYPE_AP_VLAN:
 567                         continue;
 568                 default:
 569                         break;
 570                 }
 571                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 572                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 573                         continue;
 574                 if (ieee80211_sdata_running(sdata))
 575                         iterator(data, sdata->vif.addr,
 576                                  &sdata->vif);
 577         }
 578
 579         sdata = rcu_dereference_protected(local->monitor_sdata,
 580                                           lockdep_is_held(&local->iflist_mtx));
 581         if (sdata &&
 582             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 583              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 584                 iterator(data, sdata->vif.addr, &sdata->vif);
 585
 586         mutex_unlock(&local->iflist_mtx);
 587 }
 588 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 589
 590 void ieee80211_iterate_active_interfaces_atomic(
 591         struct ieee80211_hw *hw, u32 iter_flags,
 592         void (*iterator)(void *data, u8 *mac,
 593                          struct ieee80211_vif *vif),
 594         void *data)
 595 {
 596         struct ieee80211_local *local = hw_to_local(hw);
 597         struct ieee80211_sub_if_data *sdata;
 598
 599         rcu_read_lock();
 600
 601         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 602                 switch (sdata->vif.type) {
 603                 case NL80211_IFTYPE_MONITOR:
 604                         if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 605                                 continue;
 606                         break;
 607                 case NL80211_IFTYPE_AP_VLAN:
 608                         continue;
 609                 default:
 610                         break;
 611                 }
 612                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 613                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 614                         continue;
 615                 if (ieee80211_sdata_running(sdata))
 616                         iterator(data, sdata->vif.addr,
 617                                  &sdata->vif);
 618         }
 619
 620         sdata = rcu_dereference(local->monitor_sdata);
 621         if (sdata &&
 622             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 623              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 624                 iterator(data, sdata->vif.addr, &sdata->vif);
 625
 626         rcu_read_unlock();
 627 }
 628 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 629
 630 /*
 631  * Nothing should have been stuffed into the workqueue during
 632  * the suspend->resume cycle. If this WARN is seen then there
 633  * is a bug with either the driver suspend or something in
 634  * mac80211 stuffing into the workqueue which we haven't yet
 635  * cleared during mac80211's suspend cycle.
 636  */
 637 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 638 {
 639         if (WARN(local->suspended && !local->resuming,
 640                  "queueing ieee80211 work while going to suspend\n"))
 641                 return false;
 642
 643         return true;
 644 }
 645
 646 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 647 {
 648         struct ieee80211_local *local = hw_to_local(hw);
 649
 650         if (!ieee80211_can_queue_work(local))
 651                 return;
 652
 653         queue_work(local->workqueue, work);
 654 }
 655 EXPORT_SYMBOL(ieee80211_queue_work);
 656
 657 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 658                                   struct delayed_work *dwork,
 659                                   unsigned long delay)
 660 {
 661         struct ieee80211_local *local = hw_to_local(hw);
 662
 663         if (!ieee80211_can_queue_work(local))
 664                 return;
 665
 666         queue_delayed_work(local->workqueue, dwork, delay);
 667 }
 668 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 669
 670 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 671                                struct ieee802_11_elems *elems,
 672                                u64 filter, u32 crc)
 673 {
 674         size_t left = len;
 675         const u8 *pos = start;
 676         bool calc_crc = filter != 0;
 677         DECLARE_BITMAP(seen_elems, 256);
 678         const u8 *ie;
 679
 680         bitmap_zero(seen_elems, 256);
 681         memset(elems, 0, sizeof(*elems));
 682         elems->ie_start = start;
 683         elems->total_len = len;
 684
 685         while (left >= 2) {
 686                 u8 id, elen;
 687                 bool elem_parse_failed;
 688
 689                 id = *pos++;
 690                 elen = *pos++;
 691                 left -= 2;
 692
 693                 if (elen > left) {
 694                         elems->parse_error = true;
 695                         break;
 696                 }
 697
 698                 switch (id) {
 699                 case WLAN_EID_SSID:
 700                 case WLAN_EID_SUPP_RATES:
 701                 case WLAN_EID_FH_PARAMS:
 702                 case WLAN_EID_DS_PARAMS:
 703                 case WLAN_EID_CF_PARAMS:
 704                 case WLAN_EID_TIM:
 705                 case WLAN_EID_IBSS_PARAMS:
 706                 case WLAN_EID_CHALLENGE:
 707                 case WLAN_EID_RSN:
 708                 case WLAN_EID_ERP_INFO:
 709                 case WLAN_EID_EXT_SUPP_RATES:
 710                 case WLAN_EID_HT_CAPABILITY:
 711                 case WLAN_EID_HT_OPERATION:
 712                 case WLAN_EID_VHT_CAPABILITY:
 713                 case WLAN_EID_VHT_OPERATION:
 714                 case WLAN_EID_MESH_ID:
 715                 case WLAN_EID_MESH_CONFIG:
 716                 case WLAN_EID_PEER_MGMT:
 717                 case WLAN_EID_PREQ:
 718                 case WLAN_EID_PREP:
 719                 case WLAN_EID_PERR:
 720                 case WLAN_EID_RANN:
 721                 case WLAN_EID_CHANNEL_SWITCH:
 722                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 723                 case WLAN_EID_COUNTRY:
 724                 case WLAN_EID_PWR_CONSTRAINT:
 725                 case WLAN_EID_TIMEOUT_INTERVAL:
 726                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 727                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 728                 /*
 729                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 730                  * that if the content gets bigger it might be needed more than once
 731                  */
 732                         if (test_bit(id, seen_elems)) {
 733                                 elems->parse_error = true;
 734                                 left -= elen;
 735                                 pos += elen;
 736                                 continue;
 737                         }
 738                         break;
 739                 }
 740
 741                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 742                         crc = crc32_be(crc, pos - 2, elen + 2);
 743
 744                 elem_parse_failed = false;
 745
 746                 switch (id) {
 747                 case WLAN_EID_SSID:
 748                         elems->ssid = pos;
 749                         elems->ssid_len = elen;
 750                         break;
 751                 case WLAN_EID_SUPP_RATES:
 752                         elems->supp_rates = pos;
 753                         elems->supp_rates_len = elen;
 754                         break;
 755                 case WLAN_EID_DS_PARAMS:
 756                         if (elen >= 1)
 757                                 elems->ds_params = pos;
 758                         else
 759                                 elem_parse_failed = true;
 760                         break;
 761                 case WLAN_EID_TIM:
 762                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 763                                 elems->tim = (void *)pos;
 764                                 elems->tim_len = elen;
 765                         } else
 766                                 elem_parse_failed = true;
 767                         break;
 768                 case WLAN_EID_CHALLENGE:
 769                         elems->challenge = pos;
 770                         elems->challenge_len = elen;
 771                         break;
 772                 case WLAN_EID_VENDOR_SPECIFIC:
 773                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 774                             pos[2] == 0xf2) {
 775                                 /* Microsoft OUI (00:50:F2) */
 776
 777                                 if (calc_crc)
 778                                         crc = crc32_be(crc, pos - 2, elen + 2);
 779
 780                                 if (elen >= 5 && pos[3] == 2) {
 781                                         /* OUI Type 2 - WMM IE */
 782                                         if (pos[4] == 0) {
 783                                                 elems->wmm_info = pos;
 784                                                 elems->wmm_info_len = elen;
 785                                         } else if (pos[4] == 1) {
 786                                                 elems->wmm_param = pos;
 787                                                 elems->wmm_param_len = elen;
 788                                         }
 789                                 }
 790                         }
 791                         break;
 792                 case WLAN_EID_RSN:
 793                         elems->rsn = pos;
 794                         elems->rsn_len = elen;
 795                         break;
 796                 case WLAN_EID_ERP_INFO:
 797                         if (elen >= 1)
 798                                 elems->erp_info = pos;
 799                         else
 800                                 elem_parse_failed = true;
 801                         break;
 802                 case WLAN_EID_EXT_SUPP_RATES:
 803                         elems->ext_supp_rates = pos;
 804                         elems->ext_supp_rates_len = elen;
 805                         break;
 806                 case WLAN_EID_HT_CAPABILITY:
 807                         if (elen >= sizeof(struct ieee80211_ht_cap))
 808                                 elems->ht_cap_elem = (void *)pos;
 809                         else
 810                                 elem_parse_failed = true;
 811                         break;
 812                 case WLAN_EID_HT_OPERATION:
 813                         if (elen >= sizeof(struct ieee80211_ht_operation))
 814                                 elems->ht_operation = (void *)pos;
 815                         else
 816                                 elem_parse_failed = true;
 817                         break;
 818                 case WLAN_EID_VHT_CAPABILITY:
 819                         if (elen >= sizeof(struct ieee80211_vht_cap))
 820                                 elems->vht_cap_elem = (void *)pos;
 821                         else
 822                                 elem_parse_failed = true;
 823                         break;
 824                 case WLAN_EID_VHT_OPERATION:
 825                         if (elen >= sizeof(struct ieee80211_vht_operation))
 826                                 elems->vht_operation = (void *)pos;
 827                         else
 828                                 elem_parse_failed = true;
 829                         break;
 830                 case WLAN_EID_OPMODE_NOTIF:
 831                         if (elen > 0)
 832                                 elems->opmode_notif = pos;
 833                         else
 834                                 elem_parse_failed = true;
 835                         break;
 836                 case WLAN_EID_MESH_ID:
 837                         elems->mesh_id = pos;
 838                         elems->mesh_id_len = elen;
 839                         break;
 840                 case WLAN_EID_MESH_CONFIG:
 841                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 842                                 elems->mesh_config = (void *)pos;
 843                         else
 844                                 elem_parse_failed = true;
 845                         break;
 846                 case WLAN_EID_PEER_MGMT:
 847                         elems->peering = pos;
 848                         elems->peering_len = elen;
 849                         break;
 850                 case WLAN_EID_MESH_AWAKE_WINDOW:
 851                         if (elen >= 2)
 852                                 elems->awake_window = (void *)pos;
 853                         break;
 854                 case WLAN_EID_PREQ:
 855                         elems->preq = pos;
 856                         elems->preq_len = elen;
 857                         break;
 858                 case WLAN_EID_PREP:
 859                         elems->prep = pos;
 860                         elems->prep_len = elen;
 861                         break;
 862                 case WLAN_EID_PERR:
 863                         elems->perr = pos;
 864                         elems->perr_len = elen;
 865                         break;
 866                 case WLAN_EID_RANN:
 867                         if (elen >= sizeof(struct ieee80211_rann_ie))
 868                                 elems->rann = (void *)pos;
 869                         else
 870                                 elem_parse_failed = true;
 871                         break;
 872                 case WLAN_EID_CHANNEL_SWITCH:
 873                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 874                                 elem_parse_failed = true;
 875                                 break;
 876                         }
 877                         elems->ch_switch_ie = (void *)pos;
 878                         break;
 879                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 880                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
 881                                 elem_parse_failed = true;
 882                                 break;
 883                         }
 884                         elems->ext_chansw_ie = (void *)pos;
 885                         break;
 886                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 887                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
 888                                 elem_parse_failed = true;
 889                                 break;
 890                         }
 891                         elems->sec_chan_offs = (void *)pos;
 892                         break;
 893                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 894                         if (!action ||
 895                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
 896                                 elem_parse_failed = true;
 897                                 break;
 898                         }
 899                         elems->wide_bw_chansw_ie = (void *)pos;
 900                         break;
 901                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
 902                         if (action) {
 903                                 elem_parse_failed = true;
 904                                 break;
 905                         }
 906                         /*
 907                          * This is a bit tricky, but as we only care about
 908                          * the wide bandwidth channel switch element, so
 909                          * just parse it out manually.
 910                          */
 911                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
 912                                               pos, elen);
 913                         if (ie) {
 914                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
 915                                         elems->wide_bw_chansw_ie =
 916                                                 (void *)(ie + 2);
 917                                 else
 918                                         elem_parse_failed = true;
 919                         }
 920                         break;
 921                 case WLAN_EID_COUNTRY:
 922                         elems->country_elem = pos;
 923                         elems->country_elem_len = elen;
 924                         break;
 925                 case WLAN_EID_PWR_CONSTRAINT:
 926                         if (elen != 1) {
 927                                 elem_parse_failed = true;
 928                                 break;
 929                         }
 930                         elems->pwr_constr_elem = pos;
 931                         break;
 932                 case WLAN_EID_TIMEOUT_INTERVAL:
 933                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
 934                                 elems->timeout_int = (void *)pos;
 935                         else
 936                                 elem_parse_failed = true;
 937                         break;
 938                 default:
 939                         break;
 940                 }
 941
 942                 if (elem_parse_failed)
 943                         elems->parse_error = true;
 944                 else
 945                         __set_bit(id, seen_elems);
 946
 947                 left -= elen;
 948                 pos += elen;
 949         }
 950
 951         if (left != 0)
 952                 elems->parse_error = true;
 953
 954         return crc;
 955 }
 956
 957 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 958                                bool bss_notify)
 959 {
 960         struct ieee80211_local *local = sdata->local;
 961         struct ieee80211_tx_queue_params qparam;
 962         struct ieee80211_chanctx_conf *chanctx_conf;
 963         int ac;
 964         bool use_11b, enable_qos;
 965         int aCWmin, aCWmax;
 966
 967         if (!local->ops->conf_tx)
 968                 return;
 969
 970         if (local->hw.queues < IEEE80211_NUM_ACS)
 971                 return;
 972
 973         memset(&qparam, 0, sizeof(qparam));
 974
 975         rcu_read_lock();
 976         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 977         use_11b = (chanctx_conf &&
 978                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
 979                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 980         rcu_read_unlock();
 981
 982         /*
 983          * By default disable QoS in STA mode for old access points, which do
 984          * not support 802.11e. New APs will provide proper queue parameters,
 985          * that we will configure later.
 986          */
 987         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 988
 989         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 990                 /* Set defaults according to 802.11-2007 Table 7-37 */
 991                 aCWmax = 1023;
 992                 if (use_11b)
 993                         aCWmin = 31;
 994                 else
 995                         aCWmin = 15;
 996
 997                 if (enable_qos) {
 998                         switch (ac) {
 999                         case IEEE80211_AC_BK:
1000                                 qparam.cw_max = aCWmax;
1001                                 qparam.cw_min = aCWmin;
1002                                 qparam.txop = 0;
1003                                 qparam.aifs = 7;
1004                                 break;
1005                         /* never happens but let's not leave undefined */
1006                         default:
1007                         case IEEE80211_AC_BE:
1008                                 qparam.cw_max = aCWmax;
1009                                 qparam.cw_min = aCWmin;
1010                                 qparam.txop = 0;
1011                                 qparam.aifs = 3;
1012                                 break;
1013                         case IEEE80211_AC_VI:
1014                                 qparam.cw_max = aCWmin;
1015                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1016                                 if (use_11b)
1017                                         qparam.txop = 6016/32;
1018                                 else
1019                                         qparam.txop = 3008/32;
1020                                 qparam.aifs = 2;
1021                                 break;
1022                         case IEEE80211_AC_VO:
1023                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1024                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1025                                 if (use_11b)
1026                                         qparam.txop = 3264/32;
1027                                 else
1028                                         qparam.txop = 1504/32;
1029                                 qparam.aifs = 2;
1030                                 break;
1031                         }
1032                 } else {
1033                         /* Confiure old 802.11b/g medium access rules. */
1034                         qparam.cw_max = aCWmax;
1035                         qparam.cw_min = aCWmin;
1036                         qparam.txop = 0;
1037                         qparam.aifs = 2;
1038                 }
1039
1040                 qparam.uapsd = false;
1041
1042                 sdata->tx_conf[ac] = qparam;
1043                 drv_conf_tx(local, sdata, ac, &qparam);
1044         }
1045
1046         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1047             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1048                 sdata->vif.bss_conf.qos = enable_qos;
1049                 if (bss_notify)
1050                         ieee80211_bss_info_change_notify(sdata,
1051                                                          BSS_CHANGED_QOS);
1052         }
1053 }
1054
1055 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
1056                                   const size_t supp_rates_len,
1057                                   const u8 *supp_rates)
1058 {
1059         struct ieee80211_chanctx_conf *chanctx_conf;
1060         int i, have_higher_than_11mbit = 0;
1061
1062         /* cf. IEEE 802.11 9.2.12 */
1063         for (i = 0; i < supp_rates_len; i++)
1064                 if ((supp_rates[i] & 0x7f) * 5 > 110)
1065                         have_higher_than_11mbit = 1;
1066
1067         rcu_read_lock();
1068         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1069
1070         if (chanctx_conf &&
1071             chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ &&
1072             have_higher_than_11mbit)
1073                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1074         else
1075                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1076         rcu_read_unlock();
1077
1078         ieee80211_set_wmm_default(sdata, true);
1079 }
1080
1081 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1082                          u16 transaction, u16 auth_alg, u16 status,
1083                          const u8 *extra, size_t extra_len, const u8 *da,
1084                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1085                          u32 tx_flags)
1086 {
1087         struct ieee80211_local *local = sdata->local;
1088         struct sk_buff *skb;
1089         struct ieee80211_mgmt *mgmt;
1090         int err;
1091
1092         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1093                             sizeof(*mgmt) + 6 + extra_len);
1094         if (!skb)
1095                 return;
1096
1097         skb_reserve(skb, local->hw.extra_tx_headroom);
1098
1099         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1100         memset(mgmt, 0, 24 + 6);
1101         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1102                                           IEEE80211_STYPE_AUTH);
1103         memcpy(mgmt->da, da, ETH_ALEN);
1104         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1105         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1106         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1107         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1108         mgmt->u.auth.status_code = cpu_to_le16(status);
1109         if (extra)
1110                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1111
1112         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1113                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1114                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1115                 WARN_ON(err);
1116         }
1117
1118         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1119                                         tx_flags;
1120         ieee80211_tx_skb(sdata, skb);
1121 }
1122
1123 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1124                                     const u8 *bssid, u16 stype, u16 reason,
1125                                     bool send_frame, u8 *frame_buf)
1126 {
1127         struct ieee80211_local *local = sdata->local;
1128         struct sk_buff *skb;
1129         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1130
1131         /* build frame */
1132         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1133         mgmt->duration = 0; /* initialize only */
1134         mgmt->seq_ctrl = 0; /* initialize only */
1135         memcpy(mgmt->da, bssid, ETH_ALEN);
1136         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1137         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1138         /* u.deauth.reason_code == u.disassoc.reason_code */
1139         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1140
1141         if (send_frame) {
1142                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1143                                     IEEE80211_DEAUTH_FRAME_LEN);
1144                 if (!skb)
1145                         return;
1146
1147                 skb_reserve(skb, local->hw.extra_tx_headroom);
1148
1149                 /* copy in frame */
1150                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1151                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1152
1153                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1154                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1155                         IEEE80211_SKB_CB(skb)->flags |=
1156                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1157
1158                 ieee80211_tx_skb(sdata, skb);
1159         }
1160 }
1161
1162 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1163                              size_t buffer_len, const u8 *ie, size_t ie_len,
1164                              enum ieee80211_band band, u32 rate_mask,
1165                              u8 channel)
1166 {
1167         struct ieee80211_supported_band *sband;
1168         u8 *pos = buffer, *end = buffer + buffer_len;
1169         size_t offset = 0, noffset;
1170         int supp_rates_len, i;
1171         u8 rates[32];
1172         int num_rates;
1173         int ext_rates_len;
1174
1175         sband = local->hw.wiphy->bands[band];
1176         if (WARN_ON_ONCE(!sband))
1177                 return 0;
1178
1179         num_rates = 0;
1180         for (i = 0; i < sband->n_bitrates; i++) {
1181                 if ((BIT(i) & rate_mask) == 0)
1182                         continue; /* skip rate */
1183                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1184         }
1185
1186         supp_rates_len = min_t(int, num_rates, 8);
1187
1188         if (end - pos < 2 + supp_rates_len)
1189                 goto out_err;
1190         *pos++ = WLAN_EID_SUPP_RATES;
1191         *pos++ = supp_rates_len;
1192         memcpy(pos, rates, supp_rates_len);
1193         pos += supp_rates_len;
1194
1195         /* insert "request information" if in custom IEs */
1196         if (ie && ie_len) {
1197                 static const u8 before_extrates[] = {
1198                         WLAN_EID_SSID,
1199                         WLAN_EID_SUPP_RATES,
1200                         WLAN_EID_REQUEST,
1201                 };
1202                 noffset = ieee80211_ie_split(ie, ie_len,
1203                                              before_extrates,
1204                                              ARRAY_SIZE(before_extrates),
1205                                              offset);
1206                 if (end - pos < noffset - offset)
1207                         goto out_err;
1208                 memcpy(pos, ie + offset, noffset - offset);
1209                 pos += noffset - offset;
1210                 offset = noffset;
1211         }
1212
1213         ext_rates_len = num_rates - supp_rates_len;
1214         if (ext_rates_len > 0) {
1215                 if (end - pos < 2 + ext_rates_len)
1216                         goto out_err;
1217                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1218                 *pos++ = ext_rates_len;
1219                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1220                 pos += ext_rates_len;
1221         }
1222
1223         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1224                 if (end - pos < 3)
1225                         goto out_err;
1226                 *pos++ = WLAN_EID_DS_PARAMS;
1227                 *pos++ = 1;
1228                 *pos++ = channel;
1229         }
1230
1231         /* insert custom IEs that go before HT */
1232         if (ie && ie_len) {
1233                 static const u8 before_ht[] = {
1234                         WLAN_EID_SSID,
1235                         WLAN_EID_SUPP_RATES,
1236                         WLAN_EID_REQUEST,
1237                         WLAN_EID_EXT_SUPP_RATES,
1238                         WLAN_EID_DS_PARAMS,
1239                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1240                 };
1241                 noffset = ieee80211_ie_split(ie, ie_len,
1242                                              before_ht, ARRAY_SIZE(before_ht),
1243                                              offset);
1244                 if (end - pos < noffset - offset)
1245                         goto out_err;
1246                 memcpy(pos, ie + offset, noffset - offset);
1247                 pos += noffset - offset;
1248                 offset = noffset;
1249         }
1250
1251         if (sband->ht_cap.ht_supported) {
1252                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1253                         goto out_err;
1254                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1255                                                 sband->ht_cap.cap);
1256         }
1257
1258         /*
1259          * If adding more here, adjust code in main.c
1260          * that calculates local->scan_ies_len.
1261          */
1262
1263         /* add any remaining custom IEs */
1264         if (ie && ie_len) {
1265                 noffset = ie_len;
1266                 if (end - pos < noffset - offset)
1267                         goto out_err;
1268                 memcpy(pos, ie + offset, noffset - offset);
1269                 pos += noffset - offset;
1270         }
1271
1272         if (sband->vht_cap.vht_supported) {
1273                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1274                         goto out_err;
1275                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1276                                                  sband->vht_cap.cap);
1277         }
1278
1279         return pos - buffer;
1280  out_err:
1281         WARN_ONCE(1, "not enough space for preq IEs\n");
1282         return pos - buffer;
1283 }
1284
1285 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1286                                           u8 *dst, u32 ratemask,
1287                                           struct ieee80211_channel *chan,
1288                                           const u8 *ssid, size_t ssid_len,
1289                                           const u8 *ie, size_t ie_len,
1290                                           bool directed)
1291 {
1292         struct ieee80211_local *local = sdata->local;
1293         struct sk_buff *skb;
1294         struct ieee80211_mgmt *mgmt;
1295         u8 chan_no;
1296         int ies_len;
1297
1298         /*
1299          * Do not send DS Channel parameter for directed probe requests
1300          * in order to maximize the chance that we get a response.  Some
1301          * badly-behaved APs don't respond when this parameter is included.
1302          */
1303         if (directed)
1304                 chan_no = 0;
1305         else
1306                 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1307
1308         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1309                                      ssid, ssid_len, 100 + ie_len);
1310         if (!skb)
1311                 return NULL;
1312
1313         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1314                                            skb_tailroom(skb),
1315                                            ie, ie_len, chan->band,
1316                                            ratemask, chan_no);
1317         skb_put(skb, ies_len);
1318
1319         if (dst) {
1320                 mgmt = (struct ieee80211_mgmt *) skb->data;
1321                 memcpy(mgmt->da, dst, ETH_ALEN);
1322                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1323         }
1324
1325         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1326
1327         return skb;
1328 }
1329
1330 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1331                               const u8 *ssid, size_t ssid_len,
1332                               const u8 *ie, size_t ie_len,
1333                               u32 ratemask, bool directed, u32 tx_flags,
1334                               struct ieee80211_channel *channel, bool scan)
1335 {
1336         struct sk_buff *skb;
1337
1338         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1339                                         ssid, ssid_len,
1340                                         ie, ie_len, directed);
1341         if (skb) {
1342                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1343                 if (scan)
1344                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1345                 else
1346                         ieee80211_tx_skb(sdata, skb);
1347         }
1348 }
1349
1350 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1351                             struct ieee802_11_elems *elems,
1352                             enum ieee80211_band band, u32 *basic_rates)
1353 {
1354         struct ieee80211_supported_band *sband;
1355         struct ieee80211_rate *bitrates;
1356         size_t num_rates;
1357         u32 supp_rates;
1358         int i, j;
1359         sband = local->hw.wiphy->bands[band];
1360
1361         if (WARN_ON(!sband))
1362                 return 1;
1363
1364         bitrates = sband->bitrates;
1365         num_rates = sband->n_bitrates;
1366         supp_rates = 0;
1367         for (i = 0; i < elems->supp_rates_len +
1368                      elems->ext_supp_rates_len; i++) {
1369                 u8 rate = 0;
1370                 int own_rate;
1371                 bool is_basic;
1372                 if (i < elems->supp_rates_len)
1373                         rate = elems->supp_rates[i];
1374                 else if (elems->ext_supp_rates)
1375                         rate = elems->ext_supp_rates
1376                                 [i - elems->supp_rates_len];
1377                 own_rate = 5 * (rate & 0x7f);
1378                 is_basic = !!(rate & 0x80);
1379
1380                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1381                         continue;
1382
1383                 for (j = 0; j < num_rates; j++) {
1384                         if (bitrates[j].bitrate == own_rate) {
1385                                 supp_rates |= BIT(j);
1386                                 if (basic_rates && is_basic)
1387                                         *basic_rates |= BIT(j);
1388                         }
1389                 }
1390         }
1391         return supp_rates;
1392 }
1393
1394 void ieee80211_stop_device(struct ieee80211_local *local)
1395 {
1396         ieee80211_led_radio(local, false);
1397         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1398
1399         cancel_work_sync(&local->reconfig_filter);
1400
1401         flush_workqueue(local->workqueue);
1402         drv_stop(local);
1403 }
1404
1405 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1406                                      struct ieee80211_sub_if_data *sdata)
1407 {
1408         struct ieee80211_chanctx_conf *conf;
1409         struct ieee80211_chanctx *ctx;
1410
1411         if (!local->use_chanctx)
1412                 return;
1413
1414         mutex_lock(&local->chanctx_mtx);
1415         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1416                                          lockdep_is_held(&local->chanctx_mtx));
1417         if (conf) {
1418                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1419                 drv_assign_vif_chanctx(local, sdata, ctx);
1420         }
1421         mutex_unlock(&local->chanctx_mtx);
1422 }
1423
1424 int ieee80211_reconfig(struct ieee80211_local *local)
1425 {
1426         struct ieee80211_hw *hw = &local->hw;
1427         struct ieee80211_sub_if_data *sdata;
1428         struct ieee80211_chanctx *ctx;
1429         struct sta_info *sta;
1430         int res, i;
1431         bool reconfig_due_to_wowlan = false;
1432
1433 #ifdef CONFIG_PM
1434         if (local->suspended)
1435                 local->resuming = true;
1436
1437         if (local->wowlan) {
1438                 local->wowlan = false;
1439                 res = drv_resume(local);
1440                 if (res < 0) {
1441                         local->resuming = false;
1442                         return res;
1443                 }
1444                 if (res == 0)
1445                         goto wake_up;
1446                 WARN_ON(res > 1);
1447                 /*
1448                  * res is 1, which means the driver requested
1449                  * to go through a regular reset on wakeup.
1450                  */
1451                 reconfig_due_to_wowlan = true;
1452         }
1453 #endif
1454         /* everything else happens only if HW was up & running */
1455         if (!local->open_count)
1456                 goto wake_up;
1457
1458         /*
1459          * Upon resume hardware can sometimes be goofy due to
1460          * various platform / driver / bus issues, so restarting
1461          * the device may at times not work immediately. Propagate
1462          * the error.
1463          */
1464         res = drv_start(local);
1465         if (res) {
1466                 WARN(local->suspended, "Hardware became unavailable "
1467                      "upon resume. This could be a software issue "
1468                      "prior to suspend or a hardware issue.\n");
1469                 return res;
1470         }
1471
1472         /* setup fragmentation threshold */
1473         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1474
1475         /* setup RTS threshold */
1476         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1477
1478         /* reset coverage class */
1479         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1480
1481         ieee80211_led_radio(local, true);
1482         ieee80211_mod_tpt_led_trig(local,
1483                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1484
1485         /* add interfaces */
1486         sdata = rtnl_dereference(local->monitor_sdata);
1487         if (sdata) {
1488                 /* in HW restart it exists already */
1489                 WARN_ON(local->resuming);
1490                 res = drv_add_interface(local, sdata);
1491                 if (WARN_ON(res)) {
1492                         rcu_assign_pointer(local->monitor_sdata, NULL);
1493                         synchronize_net();
1494                         kfree(sdata);
1495                 }
1496         }
1497
1498         list_for_each_entry(sdata, &local->interfaces, list) {
1499                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1500                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1501                     ieee80211_sdata_running(sdata))
1502                         res = drv_add_interface(local, sdata);
1503         }
1504
1505         /* add channel contexts */
1506         if (local->use_chanctx) {
1507                 mutex_lock(&local->chanctx_mtx);
1508                 list_for_each_entry(ctx, &local->chanctx_list, list)
1509                         WARN_ON(drv_add_chanctx(local, ctx));
1510                 mutex_unlock(&local->chanctx_mtx);
1511         }
1512
1513         list_for_each_entry(sdata, &local->interfaces, list) {
1514                 if (!ieee80211_sdata_running(sdata))
1515                         continue;
1516                 ieee80211_assign_chanctx(local, sdata);
1517         }
1518
1519         sdata = rtnl_dereference(local->monitor_sdata);
1520         if (sdata && ieee80211_sdata_running(sdata))
1521                 ieee80211_assign_chanctx(local, sdata);
1522
1523         /* add STAs back */
1524         mutex_lock(&local->sta_mtx);
1525         list_for_each_entry(sta, &local->sta_list, list) {
1526                 enum ieee80211_sta_state state;
1527
1528                 if (!sta->uploaded)
1529                         continue;
1530
1531                 /* AP-mode stations will be added later */
1532                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1533                         continue;
1534
1535                 for (state = IEEE80211_STA_NOTEXIST;
1536                      state < sta->sta_state; state++)
1537                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1538                                               state + 1));
1539         }
1540         mutex_unlock(&local->sta_mtx);
1541
1542         /* reconfigure tx conf */
1543         if (hw->queues >= IEEE80211_NUM_ACS) {
1544                 list_for_each_entry(sdata, &local->interfaces, list) {
1545                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1546                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1547                             !ieee80211_sdata_running(sdata))
1548                                 continue;
1549
1550                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1551                                 drv_conf_tx(local, sdata, i,
1552                                             &sdata->tx_conf[i]);
1553                 }
1554         }
1555
1556         /* reconfigure hardware */
1557         ieee80211_hw_config(local, ~0);
1558
1559         ieee80211_configure_filter(local);
1560
1561         /* Finally also reconfigure all the BSS information */
1562         list_for_each_entry(sdata, &local->interfaces, list) {
1563                 u32 changed;
1564
1565                 if (!ieee80211_sdata_running(sdata))
1566                         continue;
1567
1568                 /* common change flags for all interface types */
1569                 changed = BSS_CHANGED_ERP_CTS_PROT |
1570                           BSS_CHANGED_ERP_PREAMBLE |
1571                           BSS_CHANGED_ERP_SLOT |
1572                           BSS_CHANGED_HT |
1573                           BSS_CHANGED_BASIC_RATES |
1574                           BSS_CHANGED_BEACON_INT |
1575                           BSS_CHANGED_BSSID |
1576                           BSS_CHANGED_CQM |
1577                           BSS_CHANGED_QOS |
1578                           BSS_CHANGED_IDLE |
1579                           BSS_CHANGED_TXPOWER;
1580
1581                 switch (sdata->vif.type) {
1582                 case NL80211_IFTYPE_STATION:
1583                         changed |= BSS_CHANGED_ASSOC |
1584                                    BSS_CHANGED_ARP_FILTER |
1585                                    BSS_CHANGED_PS;
1586
1587                         /* Re-send beacon info report to the driver */
1588                         if (sdata->u.mgd.have_beacon)
1589                                 changed |= BSS_CHANGED_BEACON_INFO;
1590
1591                         sdata_lock(sdata);
1592                         ieee80211_bss_info_change_notify(sdata, changed);
1593                         sdata_unlock(sdata);
1594                         break;
1595                 case NL80211_IFTYPE_ADHOC:
1596                         changed |= BSS_CHANGED_IBSS;
1597                         /* fall through */
1598                 case NL80211_IFTYPE_AP:
1599                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1600
1601                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1602                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1603
1604                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1605                                         drv_start_ap(local, sdata);
1606                         }
1607
1608                         /* fall through */
1609                 case NL80211_IFTYPE_MESH_POINT:
1610                         if (sdata->vif.bss_conf.enable_beacon) {
1611                                 changed |= BSS_CHANGED_BEACON |
1612                                            BSS_CHANGED_BEACON_ENABLED;
1613                                 ieee80211_bss_info_change_notify(sdata, changed);
1614                         }
1615                         break;
1616                 case NL80211_IFTYPE_WDS:
1617                         break;
1618                 case NL80211_IFTYPE_AP_VLAN:
1619                 case NL80211_IFTYPE_MONITOR:
1620                         /* ignore virtual */
1621                         break;
1622                 case NL80211_IFTYPE_P2P_DEVICE:
1623                         changed = BSS_CHANGED_IDLE;
1624                         break;
1625                 case NL80211_IFTYPE_UNSPECIFIED:
1626                 case NUM_NL80211_IFTYPES:
1627                 case NL80211_IFTYPE_P2P_CLIENT:
1628                 case NL80211_IFTYPE_P2P_GO:
1629                         WARN_ON(1);
1630                         break;
1631                 }
1632         }
1633
1634         ieee80211_recalc_ps(local, -1);
1635
1636         /*
1637          * The sta might be in psm against the ap (e.g. because
1638          * this was the state before a hw restart), so we
1639          * explicitly send a null packet in order to make sure
1640          * it'll sync against the ap (and get out of psm).
1641          */
1642         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1643                 list_for_each_entry(sdata, &local->interfaces, list) {
1644                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1645                                 continue;
1646                         if (!sdata->u.mgd.associated)
1647                                 continue;
1648
1649                         ieee80211_send_nullfunc(local, sdata, 0);
1650                 }
1651         }
1652
1653         /* APs are now beaconing, add back stations */
1654         mutex_lock(&local->sta_mtx);
1655         list_for_each_entry(sta, &local->sta_list, list) {
1656                 enum ieee80211_sta_state state;
1657
1658                 if (!sta->uploaded)
1659                         continue;
1660
1661                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1662                         continue;
1663
1664                 for (state = IEEE80211_STA_NOTEXIST;
1665                      state < sta->sta_state; state++)
1666                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1667                                               state + 1));
1668         }
1669         mutex_unlock(&local->sta_mtx);
1670
1671         /* add back keys */
1672         list_for_each_entry(sdata, &local->interfaces, list)
1673                 if (ieee80211_sdata_running(sdata))
1674                         ieee80211_enable_keys(sdata);
1675
1676  wake_up:
1677         local->in_reconfig = false;
1678         barrier();
1679
1680         if (local->monitors == local->open_count && local->monitors > 0)
1681                 ieee80211_add_virtual_monitor(local);
1682
1683         /*
1684          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1685          * sessions can be established after a resume.
1686          *
1687          * Also tear down aggregation sessions since reconfiguring
1688          * them in a hardware restart scenario is not easily done
1689          * right now, and the hardware will have lost information
1690          * about the sessions, but we and the AP still think they
1691          * are active. This is really a workaround though.
1692          */
1693         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1694                 mutex_lock(&local->sta_mtx);
1695
1696                 list_for_each_entry(sta, &local->sta_list, list) {
1697                         ieee80211_sta_tear_down_BA_sessions(
1698                                         sta, AGG_STOP_LOCAL_REQUEST);
1699                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1700                 }
1701
1702                 mutex_unlock(&local->sta_mtx);
1703         }
1704
1705         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1706                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1707
1708         /*
1709          * If this is for hw restart things are still running.
1710          * We may want to change that later, however.
1711          */
1712         if (!local->suspended || reconfig_due_to_wowlan)
1713                 drv_restart_complete(local);
1714
1715         if (!local->suspended)
1716                 return 0;
1717
1718 #ifdef CONFIG_PM
1719         /* first set suspended false, then resuming */
1720         local->suspended = false;
1721         mb();
1722         local->resuming = false;
1723
1724         list_for_each_entry(sdata, &local->interfaces, list) {
1725                 if (!ieee80211_sdata_running(sdata))
1726                         continue;
1727                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1728                         ieee80211_sta_restart(sdata);
1729         }
1730
1731         mod_timer(&local->sta_cleanup, jiffies + 1);
1732 #else
1733         WARN_ON(1);
1734 #endif
1735         return 0;
1736 }
1737
1738 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1739 {
1740         struct ieee80211_sub_if_data *sdata;
1741         struct ieee80211_local *local;
1742         struct ieee80211_key *key;
1743
1744         if (WARN_ON(!vif))
1745                 return;
1746
1747         sdata = vif_to_sdata(vif);
1748         local = sdata->local;
1749
1750         if (WARN_ON(!local->resuming))
1751                 return;
1752
1753         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1754                 return;
1755
1756         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1757
1758         mutex_lock(&local->key_mtx);
1759         list_for_each_entry(key, &sdata->key_list, list)
1760                 key->flags |= KEY_FLAG_TAINTED;
1761         mutex_unlock(&local->key_mtx);
1762 }
1763 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1764
1765 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1766 {
1767         struct ieee80211_local *local = sdata->local;
1768         struct ieee80211_chanctx_conf *chanctx_conf;
1769         struct ieee80211_chanctx *chanctx;
1770
1771         mutex_lock(&local->chanctx_mtx);
1772
1773         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1774                                         lockdep_is_held(&local->chanctx_mtx));
1775
1776         if (WARN_ON_ONCE(!chanctx_conf))
1777                 goto unlock;
1778
1779         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1780         ieee80211_recalc_smps_chanctx(local, chanctx);
1781  unlock:
1782         mutex_unlock(&local->chanctx_mtx);
1783 }
1784
1785 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1786 {
1787         int i;
1788
1789         for (i = 0; i < n_ids; i++)
1790                 if (ids[i] == id)
1791                         return true;
1792         return false;
1793 }
1794
1795 /**
1796  * ieee80211_ie_split - split an IE buffer according to ordering
1797  *
1798  * @ies: the IE buffer
1799  * @ielen: the length of the IE buffer
1800  * @ids: an array with element IDs that are allowed before
1801  *      the split
1802  * @n_ids: the size of the element ID array
1803  * @offset: offset where to start splitting in the buffer
1804  *
1805  * This function splits an IE buffer by updating the @offset
1806  * variable to point to the location where the buffer should be
1807  * split.
1808  *
1809  * It assumes that the given IE buffer is well-formed, this
1810  * has to be guaranteed by the caller!
1811  *
1812  * It also assumes that the IEs in the buffer are ordered
1813  * correctly, if not the result of using this function will not
1814  * be ordered correctly either, i.e. it does no reordering.
1815  *
1816  * The function returns the offset where the next part of the
1817  * buffer starts, which may be @ielen if the entire (remainder)
1818  * of the buffer should be used.
1819  */
1820 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1821                           const u8 *ids, int n_ids, size_t offset)
1822 {
1823         size_t pos = offset;
1824
1825         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1826                 pos += 2 + ies[pos + 1];
1827
1828         return pos;
1829 }
1830
1831 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1832 {
1833         size_t pos = offset;
1834
1835         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1836                 pos += 2 + ies[pos + 1];
1837
1838         return pos;
1839 }
1840
1841 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1842                                             int rssi_min_thold,
1843                                             int rssi_max_thold)
1844 {
1845         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1846
1847         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1848                 return;
1849
1850         /*
1851          * Scale up threshold values before storing it, as the RSSI averaging
1852          * algorithm uses a scaled up value as well. Change this scaling
1853          * factor if the RSSI averaging algorithm changes.
1854          */
1855         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1856         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1857 }
1858
1859 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1860                                     int rssi_min_thold,
1861                                     int rssi_max_thold)
1862 {
1863         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1864
1865         WARN_ON(rssi_min_thold == rssi_max_thold ||
1866                 rssi_min_thold > rssi_max_thold);
1867
1868         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1869                                        rssi_max_thold);
1870 }
1871 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1872
1873 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1874 {
1875         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1876
1877         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1878 }
1879 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1880
1881 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1882                               u16 cap)
1883 {
1884         __le16 tmp;
1885
1886         *pos++ = WLAN_EID_HT_CAPABILITY;
1887         *pos++ = sizeof(struct ieee80211_ht_cap);
1888         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1889
1890         /* capability flags */
1891         tmp = cpu_to_le16(cap);
1892         memcpy(pos, &tmp, sizeof(u16));
1893         pos += sizeof(u16);
1894
1895         /* AMPDU parameters */
1896         *pos++ = ht_cap->ampdu_factor |
1897                  (ht_cap->ampdu_density <<
1898                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1899
1900         /* MCS set */
1901         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1902         pos += sizeof(ht_cap->mcs);
1903
1904         /* extended capabilities */
1905         pos += sizeof(__le16);
1906
1907         /* BF capabilities */
1908         pos += sizeof(__le32);
1909
1910         /* antenna selection */
1911         pos += sizeof(u8);
1912
1913         return pos;
1914 }
1915
1916 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1917                                u32 cap)
1918 {
1919         __le32 tmp;
1920
1921         *pos++ = WLAN_EID_VHT_CAPABILITY;
1922         *pos++ = sizeof(struct ieee80211_vht_cap);
1923         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1924
1925         /* capability flags */
1926         tmp = cpu_to_le32(cap);
1927         memcpy(pos, &tmp, sizeof(u32));
1928         pos += sizeof(u32);
1929
1930         /* VHT MCS set */
1931         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1932         pos += sizeof(vht_cap->vht_mcs);
1933
1934         return pos;
1935 }
1936
1937 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1938                                const struct cfg80211_chan_def *chandef,
1939                                u16 prot_mode)
1940 {
1941         struct ieee80211_ht_operation *ht_oper;
1942         /* Build HT Information */
1943         *pos++ = WLAN_EID_HT_OPERATION;
1944         *pos++ = sizeof(struct ieee80211_ht_operation);
1945         ht_oper = (struct ieee80211_ht_operation *)pos;
1946         ht_oper->primary_chan = ieee80211_frequency_to_channel(
1947                                         chandef->chan->center_freq);
1948         switch (chandef->width) {
1949         case NL80211_CHAN_WIDTH_160:
1950         case NL80211_CHAN_WIDTH_80P80:
1951         case NL80211_CHAN_WIDTH_80:
1952         case NL80211_CHAN_WIDTH_40:
1953                 if (chandef->center_freq1 > chandef->chan->center_freq)
1954                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1955                 else
1956                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1957                 break;
1958         default:
1959                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1960                 break;
1961         }
1962         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1963             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
1964             chandef->width != NL80211_CHAN_WIDTH_20)
1965                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1966
1967         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1968         ht_oper->stbc_param = 0x0000;
1969
1970         /* It seems that Basic MCS set and Supported MCS set
1971            are identical for the first 10 bytes */
1972         memset(&ht_oper->basic_set, 0, 16);
1973         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1974
1975         return pos + sizeof(struct ieee80211_ht_operation);
1976 }
1977
1978 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
1979                                   const struct ieee80211_ht_operation *ht_oper,
1980                                   struct cfg80211_chan_def *chandef)
1981 {
1982         enum nl80211_channel_type channel_type;
1983
1984         if (!ht_oper) {
1985                 cfg80211_chandef_create(chandef, control_chan,
1986                                         NL80211_CHAN_NO_HT);
1987                 return;
1988         }
1989
1990         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1991         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1992                 channel_type = NL80211_CHAN_HT20;
1993                 break;
1994         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1995                 channel_type = NL80211_CHAN_HT40PLUS;
1996                 break;
1997         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1998                 channel_type = NL80211_CHAN_HT40MINUS;
1999                 break;
2000         default:
2001                 channel_type = NL80211_CHAN_NO_HT;
2002         }
2003
2004         cfg80211_chandef_create(chandef, control_chan, channel_type);
2005 }
2006
2007 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2008                             struct sk_buff *skb, bool need_basic,
2009                             enum ieee80211_band band)
2010 {
2011         struct ieee80211_local *local = sdata->local;
2012         struct ieee80211_supported_band *sband;
2013         int rate;
2014         u8 i, rates, *pos;
2015         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2016
2017         sband = local->hw.wiphy->bands[band];
2018         rates = sband->n_bitrates;
2019         if (rates > 8)
2020                 rates = 8;
2021
2022         if (skb_tailroom(skb) < rates + 2)
2023                 return -ENOMEM;
2024
2025         pos = skb_put(skb, rates + 2);
2026         *pos++ = WLAN_EID_SUPP_RATES;
2027         *pos++ = rates;
2028         for (i = 0; i < rates; i++) {
2029                 u8 basic = 0;
2030                 if (need_basic && basic_rates & BIT(i))
2031                         basic = 0x80;
2032                 rate = sband->bitrates[i].bitrate;
2033                 *pos++ = basic | (u8) (rate / 5);
2034         }
2035
2036         return 0;
2037 }
2038
2039 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2040                                 struct sk_buff *skb, bool need_basic,
2041                                 enum ieee80211_band band)
2042 {
2043         struct ieee80211_local *local = sdata->local;
2044         struct ieee80211_supported_band *sband;
2045         int rate;
2046         u8 i, exrates, *pos;
2047         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2048
2049         sband = local->hw.wiphy->bands[band];
2050         exrates = sband->n_bitrates;
2051         if (exrates > 8)
2052                 exrates -= 8;
2053         else
2054                 exrates = 0;
2055
2056         if (skb_tailroom(skb) < exrates + 2)
2057                 return -ENOMEM;
2058
2059         if (exrates) {
2060                 pos = skb_put(skb, exrates + 2);
2061                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2062                 *pos++ = exrates;
2063                 for (i = 8; i < sband->n_bitrates; i++) {
2064                         u8 basic = 0;
2065                         if (need_basic && basic_rates & BIT(i))
2066                                 basic = 0x80;
2067                         rate = sband->bitrates[i].bitrate;
2068                         *pos++ = basic | (u8) (rate / 5);
2069                 }
2070         }
2071         return 0;
2072 }
2073
2074 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2075 {
2076         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2077         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2078
2079         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2080                 /* non-managed type inferfaces */
2081                 return 0;
2082         }
2083         return ifmgd->ave_beacon_signal / 16;
2084 }
2085 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2086
2087 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2088 {
2089         if (!mcs)
2090                 return 1;
2091
2092         /* TODO: consider rx_highest */
2093
2094         if (mcs->rx_mask[3])
2095                 return 4;
2096         if (mcs->rx_mask[2])
2097                 return 3;
2098         if (mcs->rx_mask[1])
2099                 return 2;
2100         return 1;
2101 }
2102
2103 /**
2104  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2105  * @local: mac80211 hw info struct
2106  * @status: RX status
2107  * @mpdu_len: total MPDU length (including FCS)
2108  * @mpdu_offset: offset into MPDU to calculate timestamp at
2109  *
2110  * This function calculates the RX timestamp at the given MPDU offset, taking
2111  * into account what the RX timestamp was. An offset of 0 will just normalize
2112  * the timestamp to TSF at beginning of MPDU reception.
2113  */
2114 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2115                                      struct ieee80211_rx_status *status,
2116                                      unsigned int mpdu_len,
2117                                      unsigned int mpdu_offset)
2118 {
2119         u64 ts = status->mactime;
2120         struct rate_info ri;
2121         u16 rate;
2122
2123         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2124                 return 0;
2125
2126         memset(&ri, 0, sizeof(ri));
2127
2128         /* Fill cfg80211 rate info */
2129         if (status->flag & RX_FLAG_HT) {
2130                 ri.mcs = status->rate_idx;
2131                 ri.flags |= RATE_INFO_FLAGS_MCS;
2132                 if (status->flag & RX_FLAG_40MHZ)
2133                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2134                 if (status->flag & RX_FLAG_SHORT_GI)
2135                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2136         } else if (status->flag & RX_FLAG_VHT) {
2137                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2138                 ri.mcs = status->rate_idx;
2139                 ri.nss = status->vht_nss;
2140                 if (status->flag & RX_FLAG_40MHZ)
2141                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2142                 if (status->flag & RX_FLAG_80MHZ)
2143                         ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2144                 if (status->flag & RX_FLAG_80P80MHZ)
2145                         ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2146                 if (status->flag & RX_FLAG_160MHZ)
2147                         ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2148                 if (status->flag & RX_FLAG_SHORT_GI)
2149                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2150         } else {
2151                 struct ieee80211_supported_band *sband;
2152
2153                 sband = local->hw.wiphy->bands[status->band];
2154                 ri.legacy = sband->bitrates[status->rate_idx].bitrate;
2155         }
2156
2157         rate = cfg80211_calculate_bitrate(&ri);
2158
2159         /* rewind from end of MPDU */
2160         if (status->flag & RX_FLAG_MACTIME_END)
2161                 ts -= mpdu_len * 8 * 10 / rate;
2162
2163         ts += mpdu_offset * 8 * 10 / rate;
2164
2165         return ts;
2166 }
2167
2168 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2169 {
2170         struct ieee80211_sub_if_data *sdata;
2171
2172         mutex_lock(&local->iflist_mtx);
2173         list_for_each_entry(sdata, &local->interfaces, list) {
2174                 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
2175
2176                 if (sdata->wdev.cac_started) {
2177                         ieee80211_vif_release_channel(sdata);
2178                         cfg80211_cac_event(sdata->dev,
2179                                            NL80211_RADAR_CAC_ABORTED,
2180                                            GFP_KERNEL);
2181                 }
2182         }
2183         mutex_unlock(&local->iflist_mtx);
2184 }
2185
2186 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2187 {
2188         struct ieee80211_local *local =
2189                 container_of(work, struct ieee80211_local, radar_detected_work);
2190         struct cfg80211_chan_def chandef;
2191
2192         ieee80211_dfs_cac_cancel(local);
2193
2194         if (local->use_chanctx)
2195                 /* currently not handled */
2196                 WARN_ON(1);
2197         else {
2198                 chandef = local->hw.conf.chandef;
2199                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2200         }
2201 }
2202
2203 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2204 {
2205         struct ieee80211_local *local = hw_to_local(hw);
2206
2207         trace_api_radar_detected(local);
2208
2209         ieee80211_queue_work(hw, &local->radar_detected_work);
2210 }
2211 EXPORT_SYMBOL(ieee80211_radar_detected);