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                                     enum queue_stop_reason reason)
 457 {
 458         struct ieee80211_local *local = hw_to_local(hw);
 459         unsigned long flags;
 460         int i;
 461
 462         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 463
 464         for (i = 0; i < hw->queues; i++)
 465                 __ieee80211_stop_queue(hw, i, reason);
 466
 467         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 468 }
 469
 470 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 471 {
 472         ieee80211_stop_queues_by_reason(hw,
 473                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 474 }
 475 EXPORT_SYMBOL(ieee80211_stop_queues);
 476
 477 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 478 {
 479         struct ieee80211_local *local = hw_to_local(hw);
 480         unsigned long flags;
 481         int ret;
 482
 483         if (WARN_ON(queue >= hw->queues))
 484                 return true;
 485
 486         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 487         ret = !!local->queue_stop_reasons[queue];
 488         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 489         return ret;
 490 }
 491 EXPORT_SYMBOL(ieee80211_queue_stopped);
 492
 493 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 494                                      enum queue_stop_reason reason)
 495 {
 496         struct ieee80211_local *local = hw_to_local(hw);
 497         unsigned long flags;
 498         int i;
 499
 500         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 501
 502         for (i = 0; i < hw->queues; i++)
 503                 __ieee80211_wake_queue(hw, i, reason);
 504
 505         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 506 }
 507
 508 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 509 {
 510         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 511 }
 512 EXPORT_SYMBOL(ieee80211_wake_queues);
 513
 514 void ieee80211_iterate_active_interfaces(
 515         struct ieee80211_hw *hw, u32 iter_flags,
 516         void (*iterator)(void *data, u8 *mac,
 517                          struct ieee80211_vif *vif),
 518         void *data)
 519 {
 520         struct ieee80211_local *local = hw_to_local(hw);
 521         struct ieee80211_sub_if_data *sdata;
 522
 523         mutex_lock(&local->iflist_mtx);
 524
 525         list_for_each_entry(sdata, &local->interfaces, list) {
 526                 switch (sdata->vif.type) {
 527                 case NL80211_IFTYPE_MONITOR:
 528                 case NL80211_IFTYPE_AP_VLAN:
 529                         continue;
 530                 default:
 531                         break;
 532                 }
 533                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 534                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 535                         continue;
 536                 if (ieee80211_sdata_running(sdata))
 537                         iterator(data, sdata->vif.addr,
 538                                  &sdata->vif);
 539         }
 540
 541         sdata = rcu_dereference_protected(local->monitor_sdata,
 542                                           lockdep_is_held(&local->iflist_mtx));
 543         if (sdata &&
 544             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 545              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 546                 iterator(data, sdata->vif.addr, &sdata->vif);
 547
 548         mutex_unlock(&local->iflist_mtx);
 549 }
 550 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 551
 552 void ieee80211_iterate_active_interfaces_atomic(
 553         struct ieee80211_hw *hw, u32 iter_flags,
 554         void (*iterator)(void *data, u8 *mac,
 555                          struct ieee80211_vif *vif),
 556         void *data)
 557 {
 558         struct ieee80211_local *local = hw_to_local(hw);
 559         struct ieee80211_sub_if_data *sdata;
 560
 561         rcu_read_lock();
 562
 563         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 564                 switch (sdata->vif.type) {
 565                 case NL80211_IFTYPE_MONITOR:
 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(local->monitor_sdata);
 580         if (sdata &&
 581             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 582              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 583                 iterator(data, sdata->vif.addr, &sdata->vif);
 584
 585         rcu_read_unlock();
 586 }
 587 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 588
 589 /*
 590  * Nothing should have been stuffed into the workqueue during
 591  * the suspend->resume cycle. If this WARN is seen then there
 592  * is a bug with either the driver suspend or something in
 593  * mac80211 stuffing into the workqueue which we haven't yet
 594  * cleared during mac80211's suspend cycle.
 595  */
 596 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 597 {
 598         if (WARN(local->suspended && !local->resuming,
 599                  "queueing ieee80211 work while going to suspend\n"))
 600                 return false;
 601
 602         return true;
 603 }
 604
 605 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 606 {
 607         struct ieee80211_local *local = hw_to_local(hw);
 608
 609         if (!ieee80211_can_queue_work(local))
 610                 return;
 611
 612         queue_work(local->workqueue, work);
 613 }
 614 EXPORT_SYMBOL(ieee80211_queue_work);
 615
 616 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 617                                   struct delayed_work *dwork,
 618                                   unsigned long delay)
 619 {
 620         struct ieee80211_local *local = hw_to_local(hw);
 621
 622         if (!ieee80211_can_queue_work(local))
 623                 return;
 624
 625         queue_delayed_work(local->workqueue, dwork, delay);
 626 }
 627 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 628
 629 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 630                                struct ieee802_11_elems *elems,
 631                                u64 filter, u32 crc)
 632 {
 633         size_t left = len;
 634         u8 *pos = start;
 635         bool calc_crc = filter != 0;
 636         DECLARE_BITMAP(seen_elems, 256);
 637
 638         bitmap_zero(seen_elems, 256);
 639         memset(elems, 0, sizeof(*elems));
 640         elems->ie_start = start;
 641         elems->total_len = len;
 642
 643         while (left >= 2) {
 644                 u8 id, elen;
 645                 bool elem_parse_failed;
 646
 647                 id = *pos++;
 648                 elen = *pos++;
 649                 left -= 2;
 650
 651                 if (elen > left) {
 652                         elems->parse_error = true;
 653                         break;
 654                 }
 655
 656                 switch (id) {
 657                 case WLAN_EID_SSID:
 658                 case WLAN_EID_SUPP_RATES:
 659                 case WLAN_EID_FH_PARAMS:
 660                 case WLAN_EID_DS_PARAMS:
 661                 case WLAN_EID_CF_PARAMS:
 662                 case WLAN_EID_TIM:
 663                 case WLAN_EID_IBSS_PARAMS:
 664                 case WLAN_EID_CHALLENGE:
 665                 case WLAN_EID_RSN:
 666                 case WLAN_EID_ERP_INFO:
 667                 case WLAN_EID_EXT_SUPP_RATES:
 668                 case WLAN_EID_HT_CAPABILITY:
 669                 case WLAN_EID_HT_OPERATION:
 670                 case WLAN_EID_VHT_CAPABILITY:
 671                 case WLAN_EID_VHT_OPERATION:
 672                 case WLAN_EID_MESH_ID:
 673                 case WLAN_EID_MESH_CONFIG:
 674                 case WLAN_EID_PEER_MGMT:
 675                 case WLAN_EID_PREQ:
 676                 case WLAN_EID_PREP:
 677                 case WLAN_EID_PERR:
 678                 case WLAN_EID_RANN:
 679                 case WLAN_EID_CHANNEL_SWITCH:
 680                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 681                 case WLAN_EID_COUNTRY:
 682                 case WLAN_EID_PWR_CONSTRAINT:
 683                 case WLAN_EID_TIMEOUT_INTERVAL:
 684                         if (test_bit(id, seen_elems)) {
 685                                 elems->parse_error = true;
 686                                 left -= elen;
 687                                 pos += elen;
 688                                 continue;
 689                         }
 690                         break;
 691                 }
 692
 693                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 694                         crc = crc32_be(crc, pos - 2, elen + 2);
 695
 696                 elem_parse_failed = false;
 697
 698                 switch (id) {
 699                 case WLAN_EID_SSID:
 700                         elems->ssid = pos;
 701                         elems->ssid_len = elen;
 702                         break;
 703                 case WLAN_EID_SUPP_RATES:
 704                         elems->supp_rates = pos;
 705                         elems->supp_rates_len = elen;
 706                         break;
 707                 case WLAN_EID_FH_PARAMS:
 708                         elems->fh_params = pos;
 709                         elems->fh_params_len = elen;
 710                         break;
 711                 case WLAN_EID_DS_PARAMS:
 712                         elems->ds_params = pos;
 713                         elems->ds_params_len = elen;
 714                         break;
 715                 case WLAN_EID_CF_PARAMS:
 716                         elems->cf_params = pos;
 717                         elems->cf_params_len = elen;
 718                         break;
 719                 case WLAN_EID_TIM:
 720                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 721                                 elems->tim = (void *)pos;
 722                                 elems->tim_len = elen;
 723                         } else
 724                                 elem_parse_failed = true;
 725                         break;
 726                 case WLAN_EID_IBSS_PARAMS:
 727                         elems->ibss_params = pos;
 728                         elems->ibss_params_len = elen;
 729                         break;
 730                 case WLAN_EID_CHALLENGE:
 731                         elems->challenge = pos;
 732                         elems->challenge_len = elen;
 733                         break;
 734                 case WLAN_EID_VENDOR_SPECIFIC:
 735                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 736                             pos[2] == 0xf2) {
 737                                 /* Microsoft OUI (00:50:F2) */
 738
 739                                 if (calc_crc)
 740                                         crc = crc32_be(crc, pos - 2, elen + 2);
 741
 742                                 if (elen >= 5 && pos[3] == 2) {
 743                                         /* OUI Type 2 - WMM IE */
 744                                         if (pos[4] == 0) {
 745                                                 elems->wmm_info = pos;
 746                                                 elems->wmm_info_len = elen;
 747                                         } else if (pos[4] == 1) {
 748                                                 elems->wmm_param = pos;
 749                                                 elems->wmm_param_len = elen;
 750                                         }
 751                                 }
 752                         }
 753                         break;
 754                 case WLAN_EID_RSN:
 755                         elems->rsn = pos;
 756                         elems->rsn_len = elen;
 757                         break;
 758                 case WLAN_EID_ERP_INFO:
 759                         elems->erp_info = pos;
 760                         elems->erp_info_len = elen;
 761                         break;
 762                 case WLAN_EID_EXT_SUPP_RATES:
 763                         elems->ext_supp_rates = pos;
 764                         elems->ext_supp_rates_len = elen;
 765                         break;
 766                 case WLAN_EID_HT_CAPABILITY:
 767                         if (elen >= sizeof(struct ieee80211_ht_cap))
 768                                 elems->ht_cap_elem = (void *)pos;
 769                         else
 770                                 elem_parse_failed = true;
 771                         break;
 772                 case WLAN_EID_HT_OPERATION:
 773                         if (elen >= sizeof(struct ieee80211_ht_operation))
 774                                 elems->ht_operation = (void *)pos;
 775                         else
 776                                 elem_parse_failed = true;
 777                         break;
 778                 case WLAN_EID_VHT_CAPABILITY:
 779                         if (elen >= sizeof(struct ieee80211_vht_cap))
 780                                 elems->vht_cap_elem = (void *)pos;
 781                         else
 782                                 elem_parse_failed = true;
 783                         break;
 784                 case WLAN_EID_VHT_OPERATION:
 785                         if (elen >= sizeof(struct ieee80211_vht_operation))
 786                                 elems->vht_operation = (void *)pos;
 787                         else
 788                                 elem_parse_failed = true;
 789                         break;
 790                 case WLAN_EID_OPMODE_NOTIF:
 791                         if (elen > 0)
 792                                 elems->opmode_notif = pos;
 793                         else
 794                                 elem_parse_failed = true;
 795                         break;
 796                 case WLAN_EID_MESH_ID:
 797                         elems->mesh_id = pos;
 798                         elems->mesh_id_len = elen;
 799                         break;
 800                 case WLAN_EID_MESH_CONFIG:
 801                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 802                                 elems->mesh_config = (void *)pos;
 803                         else
 804                                 elem_parse_failed = true;
 805                         break;
 806                 case WLAN_EID_PEER_MGMT:
 807                         elems->peering = pos;
 808                         elems->peering_len = elen;
 809                         break;
 810                 case WLAN_EID_MESH_AWAKE_WINDOW:
 811                         if (elen >= 2)
 812                                 elems->awake_window = (void *)pos;
 813                         break;
 814                 case WLAN_EID_PREQ:
 815                         elems->preq = pos;
 816                         elems->preq_len = elen;
 817                         break;
 818                 case WLAN_EID_PREP:
 819                         elems->prep = pos;
 820                         elems->prep_len = elen;
 821                         break;
 822                 case WLAN_EID_PERR:
 823                         elems->perr = pos;
 824                         elems->perr_len = elen;
 825                         break;
 826                 case WLAN_EID_RANN:
 827                         if (elen >= sizeof(struct ieee80211_rann_ie))
 828                                 elems->rann = (void *)pos;
 829                         else
 830                                 elem_parse_failed = true;
 831                         break;
 832                 case WLAN_EID_CHANNEL_SWITCH:
 833                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 834                                 elem_parse_failed = true;
 835                                 break;
 836                         }
 837                         elems->ch_switch_ie = (void *)pos;
 838                         break;
 839                 case WLAN_EID_QUIET:
 840                         if (!elems->quiet_elem) {
 841                                 elems->quiet_elem = pos;
 842                                 elems->quiet_elem_len = elen;
 843                         }
 844                         elems->num_of_quiet_elem++;
 845                         break;
 846                 case WLAN_EID_COUNTRY:
 847                         elems->country_elem = pos;
 848                         elems->country_elem_len = elen;
 849                         break;
 850                 case WLAN_EID_PWR_CONSTRAINT:
 851                         if (elen != 1) {
 852                                 elem_parse_failed = true;
 853                                 break;
 854                         }
 855                         elems->pwr_constr_elem = pos;
 856                         break;
 857                 case WLAN_EID_TIMEOUT_INTERVAL:
 858                         elems->timeout_int = pos;
 859                         elems->timeout_int_len = elen;
 860                         break;
 861                 default:
 862                         break;
 863                 }
 864
 865                 if (elem_parse_failed)
 866                         elems->parse_error = true;
 867                 else
 868                         __set_bit(id, seen_elems);
 869
 870                 left -= elen;
 871                 pos += elen;
 872         }
 873
 874         if (left != 0)
 875                 elems->parse_error = true;
 876
 877         return crc;
 878 }
 879
 880 void ieee802_11_parse_elems(u8 *start, size_t len,
 881                             struct ieee802_11_elems *elems)
 882 {
 883         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 884 }
 885
 886 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 887                                bool bss_notify)
 888 {
 889         struct ieee80211_local *local = sdata->local;
 890         struct ieee80211_tx_queue_params qparam;
 891         struct ieee80211_chanctx_conf *chanctx_conf;
 892         int ac;
 893         bool use_11b, enable_qos;
 894         int aCWmin, aCWmax;
 895
 896         if (!local->ops->conf_tx)
 897                 return;
 898
 899         if (local->hw.queues < IEEE80211_NUM_ACS)
 900                 return;
 901
 902         memset(&qparam, 0, sizeof(qparam));
 903
 904         rcu_read_lock();
 905         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 906         use_11b = (chanctx_conf &&
 907                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
 908                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 909         rcu_read_unlock();
 910
 911         /*
 912          * By default disable QoS in STA mode for old access points, which do
 913          * not support 802.11e. New APs will provide proper queue parameters,
 914          * that we will configure later.
 915          */
 916         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 917
 918         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 919                 /* Set defaults according to 802.11-2007 Table 7-37 */
 920                 aCWmax = 1023;
 921                 if (use_11b)
 922                         aCWmin = 31;
 923                 else
 924                         aCWmin = 15;
 925
 926                 if (enable_qos) {
 927                         switch (ac) {
 928                         case IEEE80211_AC_BK:
 929                                 qparam.cw_max = aCWmax;
 930                                 qparam.cw_min = aCWmin;
 931                                 qparam.txop = 0;
 932                                 qparam.aifs = 7;
 933                                 break;
 934                         /* never happens but let's not leave undefined */
 935                         default:
 936                         case IEEE80211_AC_BE:
 937                                 qparam.cw_max = aCWmax;
 938                                 qparam.cw_min = aCWmin;
 939                                 qparam.txop = 0;
 940                                 qparam.aifs = 3;
 941                                 break;
 942                         case IEEE80211_AC_VI:
 943                                 qparam.cw_max = aCWmin;
 944                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 945                                 if (use_11b)
 946                                         qparam.txop = 6016/32;
 947                                 else
 948                                         qparam.txop = 3008/32;
 949                                 qparam.aifs = 2;
 950                                 break;
 951                         case IEEE80211_AC_VO:
 952                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 953                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 954                                 if (use_11b)
 955                                         qparam.txop = 3264/32;
 956                                 else
 957                                         qparam.txop = 1504/32;
 958                                 qparam.aifs = 2;
 959                                 break;
 960                         }
 961                 } else {
 962                         /* Confiure old 802.11b/g medium access rules. */
 963                         qparam.cw_max = aCWmax;
 964                         qparam.cw_min = aCWmin;
 965                         qparam.txop = 0;
 966                         qparam.aifs = 2;
 967                 }
 968
 969                 qparam.uapsd = false;
 970
 971                 sdata->tx_conf[ac] = qparam;
 972                 drv_conf_tx(local, sdata, ac, &qparam);
 973         }
 974
 975         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 976             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 977                 sdata->vif.bss_conf.qos = enable_qos;
 978                 if (bss_notify)
 979                         ieee80211_bss_info_change_notify(sdata,
 980                                                          BSS_CHANGED_QOS);
 981         }
 982 }
 983
 984 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 985                                   const size_t supp_rates_len,
 986                                   const u8 *supp_rates)
 987 {
 988         struct ieee80211_chanctx_conf *chanctx_conf;
 989         int i, have_higher_than_11mbit = 0;
 990
 991         /* cf. IEEE 802.11 9.2.12 */
 992         for (i = 0; i < supp_rates_len; i++)
 993                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 994                         have_higher_than_11mbit = 1;
 995
 996         rcu_read_lock();
 997         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 998
 999         if (chanctx_conf &&
1000             chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ &&
1001             have_higher_than_11mbit)
1002                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1003         else
1004                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1005         rcu_read_unlock();
1006
1007         ieee80211_set_wmm_default(sdata, true);
1008 }
1009
1010 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
1011                               enum ieee80211_band band)
1012 {
1013         struct ieee80211_supported_band *sband;
1014         struct ieee80211_rate *bitrates;
1015         u32 mandatory_rates;
1016         enum ieee80211_rate_flags mandatory_flag;
1017         int i;
1018
1019         sband = local->hw.wiphy->bands[band];
1020         if (WARN_ON(!sband))
1021                 return 1;
1022
1023         if (band == IEEE80211_BAND_2GHZ)
1024                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
1025         else
1026                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
1027
1028         bitrates = sband->bitrates;
1029         mandatory_rates = 0;
1030         for (i = 0; i < sband->n_bitrates; i++)
1031                 if (bitrates[i].flags & mandatory_flag)
1032                         mandatory_rates |= BIT(i);
1033         return mandatory_rates;
1034 }
1035
1036 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1037                          u16 transaction, u16 auth_alg, u16 status,
1038                          const u8 *extra, size_t extra_len, const u8 *da,
1039                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1040                          u32 tx_flags)
1041 {
1042         struct ieee80211_local *local = sdata->local;
1043         struct sk_buff *skb;
1044         struct ieee80211_mgmt *mgmt;
1045         int err;
1046
1047         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1048                             sizeof(*mgmt) + 6 + extra_len);
1049         if (!skb)
1050                 return;
1051
1052         skb_reserve(skb, local->hw.extra_tx_headroom);
1053
1054         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1055         memset(mgmt, 0, 24 + 6);
1056         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1057                                           IEEE80211_STYPE_AUTH);
1058         memcpy(mgmt->da, da, ETH_ALEN);
1059         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1060         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1061         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1062         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1063         mgmt->u.auth.status_code = cpu_to_le16(status);
1064         if (extra)
1065                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1066
1067         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1068                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1069                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1070                 WARN_ON(err);
1071         }
1072
1073         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1074                                         tx_flags;
1075         ieee80211_tx_skb(sdata, skb);
1076 }
1077
1078 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1079                                     const u8 *bssid, u16 stype, u16 reason,
1080                                     bool send_frame, u8 *frame_buf)
1081 {
1082         struct ieee80211_local *local = sdata->local;
1083         struct sk_buff *skb;
1084         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1085
1086         /* build frame */
1087         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1088         mgmt->duration = 0; /* initialize only */
1089         mgmt->seq_ctrl = 0; /* initialize only */
1090         memcpy(mgmt->da, bssid, ETH_ALEN);
1091         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1092         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1093         /* u.deauth.reason_code == u.disassoc.reason_code */
1094         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1095
1096         if (send_frame) {
1097                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1098                                     IEEE80211_DEAUTH_FRAME_LEN);
1099                 if (!skb)
1100                         return;
1101
1102                 skb_reserve(skb, local->hw.extra_tx_headroom);
1103
1104                 /* copy in frame */
1105                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1106                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1107
1108                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1109                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1110                         IEEE80211_SKB_CB(skb)->flags |=
1111                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1112
1113                 ieee80211_tx_skb(sdata, skb);
1114         }
1115 }
1116
1117 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1118                              size_t buffer_len, const u8 *ie, size_t ie_len,
1119                              enum ieee80211_band band, u32 rate_mask,
1120                              u8 channel)
1121 {
1122         struct ieee80211_supported_band *sband;
1123         u8 *pos = buffer, *end = buffer + buffer_len;
1124         size_t offset = 0, noffset;
1125         int supp_rates_len, i;
1126         u8 rates[32];
1127         int num_rates;
1128         int ext_rates_len;
1129
1130         sband = local->hw.wiphy->bands[band];
1131         if (WARN_ON_ONCE(!sband))
1132                 return 0;
1133
1134         num_rates = 0;
1135         for (i = 0; i < sband->n_bitrates; i++) {
1136                 if ((BIT(i) & rate_mask) == 0)
1137                         continue; /* skip rate */
1138                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1139         }
1140
1141         supp_rates_len = min_t(int, num_rates, 8);
1142
1143         if (end - pos < 2 + supp_rates_len)
1144                 goto out_err;
1145         *pos++ = WLAN_EID_SUPP_RATES;
1146         *pos++ = supp_rates_len;
1147         memcpy(pos, rates, supp_rates_len);
1148         pos += supp_rates_len;
1149
1150         /* insert "request information" if in custom IEs */
1151         if (ie && ie_len) {
1152                 static const u8 before_extrates[] = {
1153                         WLAN_EID_SSID,
1154                         WLAN_EID_SUPP_RATES,
1155                         WLAN_EID_REQUEST,
1156                 };
1157                 noffset = ieee80211_ie_split(ie, ie_len,
1158                                              before_extrates,
1159                                              ARRAY_SIZE(before_extrates),
1160                                              offset);
1161                 if (end - pos < noffset - offset)
1162                         goto out_err;
1163                 memcpy(pos, ie + offset, noffset - offset);
1164                 pos += noffset - offset;
1165                 offset = noffset;
1166         }
1167
1168         ext_rates_len = num_rates - supp_rates_len;
1169         if (ext_rates_len > 0) {
1170                 if (end - pos < 2 + ext_rates_len)
1171                         goto out_err;
1172                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1173                 *pos++ = ext_rates_len;
1174                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1175                 pos += ext_rates_len;
1176         }
1177
1178         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1179                 if (end - pos < 3)
1180                         goto out_err;
1181                 *pos++ = WLAN_EID_DS_PARAMS;
1182                 *pos++ = 1;
1183                 *pos++ = channel;
1184         }
1185
1186         /* insert custom IEs that go before HT */
1187         if (ie && ie_len) {
1188                 static const u8 before_ht[] = {
1189                         WLAN_EID_SSID,
1190                         WLAN_EID_SUPP_RATES,
1191                         WLAN_EID_REQUEST,
1192                         WLAN_EID_EXT_SUPP_RATES,
1193                         WLAN_EID_DS_PARAMS,
1194                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1195                 };
1196                 noffset = ieee80211_ie_split(ie, ie_len,
1197                                              before_ht, ARRAY_SIZE(before_ht),
1198                                              offset);
1199                 if (end - pos < noffset - offset)
1200                         goto out_err;
1201                 memcpy(pos, ie + offset, noffset - offset);
1202                 pos += noffset - offset;
1203                 offset = noffset;
1204         }
1205
1206         if (sband->ht_cap.ht_supported) {
1207                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1208                         goto out_err;
1209                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1210                                                 sband->ht_cap.cap);
1211         }
1212
1213         /*
1214          * If adding more here, adjust code in main.c
1215          * that calculates local->scan_ies_len.
1216          */
1217
1218         /* add any remaining custom IEs */
1219         if (ie && ie_len) {
1220                 noffset = ie_len;
1221                 if (end - pos < noffset - offset)
1222                         goto out_err;
1223                 memcpy(pos, ie + offset, noffset - offset);
1224                 pos += noffset - offset;
1225         }
1226
1227         if (sband->vht_cap.vht_supported) {
1228                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1229                         goto out_err;
1230                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1231                                                  sband->vht_cap.cap);
1232         }
1233
1234         return pos - buffer;
1235  out_err:
1236         WARN_ONCE(1, "not enough space for preq IEs\n");
1237         return pos - buffer;
1238 }
1239
1240 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1241                                           u8 *dst, u32 ratemask,
1242                                           struct ieee80211_channel *chan,
1243                                           const u8 *ssid, size_t ssid_len,
1244                                           const u8 *ie, size_t ie_len,
1245                                           bool directed)
1246 {
1247         struct ieee80211_local *local = sdata->local;
1248         struct sk_buff *skb;
1249         struct ieee80211_mgmt *mgmt;
1250         u8 chan_no;
1251         int ies_len;
1252
1253         /*
1254          * Do not send DS Channel parameter for directed probe requests
1255          * in order to maximize the chance that we get a response.  Some
1256          * badly-behaved APs don't respond when this parameter is included.
1257          */
1258         if (directed)
1259                 chan_no = 0;
1260         else
1261                 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1262
1263         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1264                                      ssid, ssid_len, 100 + ie_len);
1265         if (!skb)
1266                 return NULL;
1267
1268         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1269                                            skb_tailroom(skb),
1270                                            ie, ie_len, chan->band,
1271                                            ratemask, chan_no);
1272         skb_put(skb, ies_len);
1273
1274         if (dst) {
1275                 mgmt = (struct ieee80211_mgmt *) skb->data;
1276                 memcpy(mgmt->da, dst, ETH_ALEN);
1277                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1278         }
1279
1280         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1281
1282         return skb;
1283 }
1284
1285 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1286                               const u8 *ssid, size_t ssid_len,
1287                               const u8 *ie, size_t ie_len,
1288                               u32 ratemask, bool directed, u32 tx_flags,
1289                               struct ieee80211_channel *channel, bool scan)
1290 {
1291         struct sk_buff *skb;
1292
1293         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1294                                         ssid, ssid_len,
1295                                         ie, ie_len, directed);
1296         if (skb) {
1297                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1298                 if (scan)
1299                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1300                 else
1301                         ieee80211_tx_skb(sdata, skb);
1302         }
1303 }
1304
1305 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1306                             struct ieee802_11_elems *elems,
1307                             enum ieee80211_band band, u32 *basic_rates)
1308 {
1309         struct ieee80211_supported_band *sband;
1310         struct ieee80211_rate *bitrates;
1311         size_t num_rates;
1312         u32 supp_rates;
1313         int i, j;
1314         sband = local->hw.wiphy->bands[band];
1315
1316         if (WARN_ON(!sband))
1317                 return 1;
1318
1319         bitrates = sband->bitrates;
1320         num_rates = sband->n_bitrates;
1321         supp_rates = 0;
1322         for (i = 0; i < elems->supp_rates_len +
1323                      elems->ext_supp_rates_len; i++) {
1324                 u8 rate = 0;
1325                 int own_rate;
1326                 bool is_basic;
1327                 if (i < elems->supp_rates_len)
1328                         rate = elems->supp_rates[i];
1329                 else if (elems->ext_supp_rates)
1330                         rate = elems->ext_supp_rates
1331                                 [i - elems->supp_rates_len];
1332                 own_rate = 5 * (rate & 0x7f);
1333                 is_basic = !!(rate & 0x80);
1334
1335                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1336                         continue;
1337
1338                 for (j = 0; j < num_rates; j++) {
1339                         if (bitrates[j].bitrate == own_rate) {
1340                                 supp_rates |= BIT(j);
1341                                 if (basic_rates && is_basic)
1342                                         *basic_rates |= BIT(j);
1343                         }
1344                 }
1345         }
1346         return supp_rates;
1347 }
1348
1349 void ieee80211_stop_device(struct ieee80211_local *local)
1350 {
1351         ieee80211_led_radio(local, false);
1352         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1353
1354         cancel_work_sync(&local->reconfig_filter);
1355
1356         flush_workqueue(local->workqueue);
1357         drv_stop(local);
1358 }
1359
1360 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1361                                      struct ieee80211_sub_if_data *sdata)
1362 {
1363         struct ieee80211_chanctx_conf *conf;
1364         struct ieee80211_chanctx *ctx;
1365
1366         if (!local->use_chanctx)
1367                 return;
1368
1369         mutex_lock(&local->chanctx_mtx);
1370         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1371                                          lockdep_is_held(&local->chanctx_mtx));
1372         if (conf) {
1373                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1374                 drv_assign_vif_chanctx(local, sdata, ctx);
1375         }
1376         mutex_unlock(&local->chanctx_mtx);
1377 }
1378
1379 int ieee80211_reconfig(struct ieee80211_local *local)
1380 {
1381         struct ieee80211_hw *hw = &local->hw;
1382         struct ieee80211_sub_if_data *sdata;
1383         struct ieee80211_chanctx *ctx;
1384         struct sta_info *sta;
1385         int res, i;
1386         bool reconfig_due_to_wowlan = false;
1387
1388 #ifdef CONFIG_PM
1389         if (local->suspended)
1390                 local->resuming = true;
1391
1392         if (local->wowlan) {
1393                 local->wowlan = false;
1394                 res = drv_resume(local);
1395                 if (res < 0) {
1396                         local->resuming = false;
1397                         return res;
1398                 }
1399                 if (res == 0)
1400                         goto wake_up;
1401                 WARN_ON(res > 1);
1402                 /*
1403                  * res is 1, which means the driver requested
1404                  * to go through a regular reset on wakeup.
1405                  */
1406                 reconfig_due_to_wowlan = true;
1407         }
1408 #endif
1409         /* everything else happens only if HW was up & running */
1410         if (!local->open_count)
1411                 goto wake_up;
1412
1413         /*
1414          * Upon resume hardware can sometimes be goofy due to
1415          * various platform / driver / bus issues, so restarting
1416          * the device may at times not work immediately. Propagate
1417          * the error.
1418          */
1419         res = drv_start(local);
1420         if (res) {
1421                 WARN(local->suspended, "Hardware became unavailable "
1422                      "upon resume. This could be a software issue "
1423                      "prior to suspend or a hardware issue.\n");
1424                 return res;
1425         }
1426
1427         /* setup fragmentation threshold */
1428         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1429
1430         /* setup RTS threshold */
1431         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1432
1433         /* reset coverage class */
1434         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1435
1436         ieee80211_led_radio(local, true);
1437         ieee80211_mod_tpt_led_trig(local,
1438                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1439
1440         /* add interfaces */
1441         sdata = rtnl_dereference(local->monitor_sdata);
1442         if (sdata) {
1443                 res = drv_add_interface(local, sdata);
1444                 if (WARN_ON(res)) {
1445                         rcu_assign_pointer(local->monitor_sdata, NULL);
1446                         synchronize_net();
1447                         kfree(sdata);
1448                 }
1449         }
1450
1451         list_for_each_entry(sdata, &local->interfaces, list) {
1452                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1453                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1454                     ieee80211_sdata_running(sdata))
1455                         res = drv_add_interface(local, sdata);
1456         }
1457
1458         /* add channel contexts */
1459         if (local->use_chanctx) {
1460                 mutex_lock(&local->chanctx_mtx);
1461                 list_for_each_entry(ctx, &local->chanctx_list, list)
1462                         WARN_ON(drv_add_chanctx(local, ctx));
1463                 mutex_unlock(&local->chanctx_mtx);
1464         }
1465
1466         list_for_each_entry(sdata, &local->interfaces, list) {
1467                 if (!ieee80211_sdata_running(sdata))
1468                         continue;
1469                 ieee80211_assign_chanctx(local, sdata);
1470         }
1471
1472         sdata = rtnl_dereference(local->monitor_sdata);
1473         if (sdata && ieee80211_sdata_running(sdata))
1474                 ieee80211_assign_chanctx(local, sdata);
1475
1476         /* add STAs back */
1477         mutex_lock(&local->sta_mtx);
1478         list_for_each_entry(sta, &local->sta_list, list) {
1479                 enum ieee80211_sta_state state;
1480
1481                 if (!sta->uploaded)
1482                         continue;
1483
1484                 /* AP-mode stations will be added later */
1485                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1486                         continue;
1487
1488                 for (state = IEEE80211_STA_NOTEXIST;
1489                      state < sta->sta_state; state++)
1490                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1491                                               state + 1));
1492         }
1493         mutex_unlock(&local->sta_mtx);
1494
1495         /* reconfigure tx conf */
1496         if (hw->queues >= IEEE80211_NUM_ACS) {
1497                 list_for_each_entry(sdata, &local->interfaces, list) {
1498                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1499                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1500                             !ieee80211_sdata_running(sdata))
1501                                 continue;
1502
1503                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1504                                 drv_conf_tx(local, sdata, i,
1505                                             &sdata->tx_conf[i]);
1506                 }
1507         }
1508
1509         /* reconfigure hardware */
1510         ieee80211_hw_config(local, ~0);
1511
1512         ieee80211_configure_filter(local);
1513
1514         /* Finally also reconfigure all the BSS information */
1515         list_for_each_entry(sdata, &local->interfaces, list) {
1516                 u32 changed;
1517
1518                 if (!ieee80211_sdata_running(sdata))
1519                         continue;
1520
1521                 /* common change flags for all interface types */
1522                 changed = BSS_CHANGED_ERP_CTS_PROT |
1523                           BSS_CHANGED_ERP_PREAMBLE |
1524                           BSS_CHANGED_ERP_SLOT |
1525                           BSS_CHANGED_HT |
1526                           BSS_CHANGED_BASIC_RATES |
1527                           BSS_CHANGED_BEACON_INT |
1528                           BSS_CHANGED_BSSID |
1529                           BSS_CHANGED_CQM |
1530                           BSS_CHANGED_QOS |
1531                           BSS_CHANGED_IDLE |
1532                           BSS_CHANGED_TXPOWER;
1533
1534                 switch (sdata->vif.type) {
1535                 case NL80211_IFTYPE_STATION:
1536                         changed |= BSS_CHANGED_ASSOC |
1537                                    BSS_CHANGED_ARP_FILTER |
1538                                    BSS_CHANGED_PS;
1539
1540                         if (sdata->u.mgd.dtim_period)
1541                                 changed |= BSS_CHANGED_DTIM_PERIOD;
1542
1543                         mutex_lock(&sdata->u.mgd.mtx);
1544                         ieee80211_bss_info_change_notify(sdata, changed);
1545                         mutex_unlock(&sdata->u.mgd.mtx);
1546                         break;
1547                 case NL80211_IFTYPE_ADHOC:
1548                         changed |= BSS_CHANGED_IBSS;
1549                         /* fall through */
1550                 case NL80211_IFTYPE_AP:
1551                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1552
1553                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1554                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1555
1556                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1557                                         drv_start_ap(local, sdata);
1558                         }
1559
1560                         /* fall through */
1561                 case NL80211_IFTYPE_MESH_POINT:
1562                         if (sdata->vif.bss_conf.enable_beacon) {
1563                                 changed |= BSS_CHANGED_BEACON |
1564                                            BSS_CHANGED_BEACON_ENABLED;
1565                                 ieee80211_bss_info_change_notify(sdata, changed);
1566                         }
1567                         break;
1568                 case NL80211_IFTYPE_WDS:
1569                         break;
1570                 case NL80211_IFTYPE_AP_VLAN:
1571                 case NL80211_IFTYPE_MONITOR:
1572                         /* ignore virtual */
1573                         break;
1574                 case NL80211_IFTYPE_P2P_DEVICE:
1575                         changed = BSS_CHANGED_IDLE;
1576                         break;
1577                 case NL80211_IFTYPE_UNSPECIFIED:
1578                 case NUM_NL80211_IFTYPES:
1579                 case NL80211_IFTYPE_P2P_CLIENT:
1580                 case NL80211_IFTYPE_P2P_GO:
1581                         WARN_ON(1);
1582                         break;
1583                 }
1584         }
1585
1586         ieee80211_recalc_ps(local, -1);
1587
1588         /*
1589          * The sta might be in psm against the ap (e.g. because
1590          * this was the state before a hw restart), so we
1591          * explicitly send a null packet in order to make sure
1592          * it'll sync against the ap (and get out of psm).
1593          */
1594         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1595                 list_for_each_entry(sdata, &local->interfaces, list) {
1596                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1597                                 continue;
1598                         if (!sdata->u.mgd.associated)
1599                                 continue;
1600
1601                         ieee80211_send_nullfunc(local, sdata, 0);
1602                 }
1603         }
1604
1605         /* APs are now beaconing, add back stations */
1606         mutex_lock(&local->sta_mtx);
1607         list_for_each_entry(sta, &local->sta_list, list) {
1608                 enum ieee80211_sta_state state;
1609
1610                 if (!sta->uploaded)
1611                         continue;
1612
1613                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1614                         continue;
1615
1616                 for (state = IEEE80211_STA_NOTEXIST;
1617                      state < sta->sta_state; state++)
1618                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1619                                               state + 1));
1620         }
1621         mutex_unlock(&local->sta_mtx);
1622
1623         /* add back keys */
1624         list_for_each_entry(sdata, &local->interfaces, list)
1625                 if (ieee80211_sdata_running(sdata))
1626                         ieee80211_enable_keys(sdata);
1627
1628  wake_up:
1629         local->in_reconfig = false;
1630         barrier();
1631
1632         /*
1633          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1634          * sessions can be established after a resume.
1635          *
1636          * Also tear down aggregation sessions since reconfiguring
1637          * them in a hardware restart scenario is not easily done
1638          * right now, and the hardware will have lost information
1639          * about the sessions, but we and the AP still think they
1640          * are active. This is really a workaround though.
1641          */
1642         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1643                 mutex_lock(&local->sta_mtx);
1644
1645                 list_for_each_entry(sta, &local->sta_list, list) {
1646                         ieee80211_sta_tear_down_BA_sessions(
1647                                         sta, AGG_STOP_LOCAL_REQUEST);
1648                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1649                 }
1650
1651                 mutex_unlock(&local->sta_mtx);
1652         }
1653
1654         ieee80211_wake_queues_by_reason(hw,
1655                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1656
1657         /*
1658          * If this is for hw restart things are still running.
1659          * We may want to change that later, however.
1660          */
1661         if (!local->suspended || reconfig_due_to_wowlan)
1662                 drv_restart_complete(local);
1663
1664         if (!local->suspended)
1665                 return 0;
1666
1667 #ifdef CONFIG_PM
1668         /* first set suspended false, then resuming */
1669         local->suspended = false;
1670         mb();
1671         local->resuming = false;
1672
1673         mod_timer(&local->sta_cleanup, jiffies + 1);
1674 #else
1675         WARN_ON(1);
1676 #endif
1677         return 0;
1678 }
1679
1680 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1681 {
1682         struct ieee80211_sub_if_data *sdata;
1683         struct ieee80211_local *local;
1684         struct ieee80211_key *key;
1685
1686         if (WARN_ON(!vif))
1687                 return;
1688
1689         sdata = vif_to_sdata(vif);
1690         local = sdata->local;
1691
1692         if (WARN_ON(!local->resuming))
1693                 return;
1694
1695         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1696                 return;
1697
1698         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1699
1700         mutex_lock(&local->key_mtx);
1701         list_for_each_entry(key, &sdata->key_list, list)
1702                 key->flags |= KEY_FLAG_TAINTED;
1703         mutex_unlock(&local->key_mtx);
1704 }
1705 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1706
1707 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1708 {
1709         struct ieee80211_local *local = sdata->local;
1710         struct ieee80211_chanctx_conf *chanctx_conf;
1711         struct ieee80211_chanctx *chanctx;
1712
1713         mutex_lock(&local->chanctx_mtx);
1714
1715         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1716                                         lockdep_is_held(&local->chanctx_mtx));
1717
1718         if (WARN_ON_ONCE(!chanctx_conf))
1719                 goto unlock;
1720
1721         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1722         ieee80211_recalc_smps_chanctx(local, chanctx);
1723  unlock:
1724         mutex_unlock(&local->chanctx_mtx);
1725 }
1726
1727 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1728 {
1729         int i;
1730
1731         for (i = 0; i < n_ids; i++)
1732                 if (ids[i] == id)
1733                         return true;
1734         return false;
1735 }
1736
1737 /**
1738  * ieee80211_ie_split - split an IE buffer according to ordering
1739  *
1740  * @ies: the IE buffer
1741  * @ielen: the length of the IE buffer
1742  * @ids: an array with element IDs that are allowed before
1743  *      the split
1744  * @n_ids: the size of the element ID array
1745  * @offset: offset where to start splitting in the buffer
1746  *
1747  * This function splits an IE buffer by updating the @offset
1748  * variable to point to the location where the buffer should be
1749  * split.
1750  *
1751  * It assumes that the given IE buffer is well-formed, this
1752  * has to be guaranteed by the caller!
1753  *
1754  * It also assumes that the IEs in the buffer are ordered
1755  * correctly, if not the result of using this function will not
1756  * be ordered correctly either, i.e. it does no reordering.
1757  *
1758  * The function returns the offset where the next part of the
1759  * buffer starts, which may be @ielen if the entire (remainder)
1760  * of the buffer should be used.
1761  */
1762 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1763                           const u8 *ids, int n_ids, size_t offset)
1764 {
1765         size_t pos = offset;
1766
1767         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1768                 pos += 2 + ies[pos + 1];
1769
1770         return pos;
1771 }
1772
1773 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1774 {
1775         size_t pos = offset;
1776
1777         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1778                 pos += 2 + ies[pos + 1];
1779
1780         return pos;
1781 }
1782
1783 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1784                                             int rssi_min_thold,
1785                                             int rssi_max_thold)
1786 {
1787         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1788
1789         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1790                 return;
1791
1792         /*
1793          * Scale up threshold values before storing it, as the RSSI averaging
1794          * algorithm uses a scaled up value as well. Change this scaling
1795          * factor if the RSSI averaging algorithm changes.
1796          */
1797         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1798         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1799 }
1800
1801 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1802                                     int rssi_min_thold,
1803                                     int rssi_max_thold)
1804 {
1805         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1806
1807         WARN_ON(rssi_min_thold == rssi_max_thold ||
1808                 rssi_min_thold > rssi_max_thold);
1809
1810         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1811                                        rssi_max_thold);
1812 }
1813 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1814
1815 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1816 {
1817         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1818
1819         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1820 }
1821 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1822
1823 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1824                               u16 cap)
1825 {
1826         __le16 tmp;
1827
1828         *pos++ = WLAN_EID_HT_CAPABILITY;
1829         *pos++ = sizeof(struct ieee80211_ht_cap);
1830         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1831
1832         /* capability flags */
1833         tmp = cpu_to_le16(cap);
1834         memcpy(pos, &tmp, sizeof(u16));
1835         pos += sizeof(u16);
1836
1837         /* AMPDU parameters */
1838         *pos++ = ht_cap->ampdu_factor |
1839                  (ht_cap->ampdu_density <<
1840                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1841
1842         /* MCS set */
1843         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1844         pos += sizeof(ht_cap->mcs);
1845
1846         /* extended capabilities */
1847         pos += sizeof(__le16);
1848
1849         /* BF capabilities */
1850         pos += sizeof(__le32);
1851
1852         /* antenna selection */
1853         pos += sizeof(u8);
1854
1855         return pos;
1856 }
1857
1858 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1859                                u32 cap)
1860 {
1861         __le32 tmp;
1862
1863         *pos++ = WLAN_EID_VHT_CAPABILITY;
1864         *pos++ = sizeof(struct ieee80211_vht_cap);
1865         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1866
1867         /* capability flags */
1868         tmp = cpu_to_le32(cap);
1869         memcpy(pos, &tmp, sizeof(u32));
1870         pos += sizeof(u32);
1871
1872         /* VHT MCS set */
1873         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1874         pos += sizeof(vht_cap->vht_mcs);
1875
1876         return pos;
1877 }
1878
1879 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1880                                const struct cfg80211_chan_def *chandef,
1881                                u16 prot_mode)
1882 {
1883         struct ieee80211_ht_operation *ht_oper;
1884         /* Build HT Information */
1885         *pos++ = WLAN_EID_HT_OPERATION;
1886         *pos++ = sizeof(struct ieee80211_ht_operation);
1887         ht_oper = (struct ieee80211_ht_operation *)pos;
1888         ht_oper->primary_chan = ieee80211_frequency_to_channel(
1889                                         chandef->chan->center_freq);
1890         switch (chandef->width) {
1891         case NL80211_CHAN_WIDTH_160:
1892         case NL80211_CHAN_WIDTH_80P80:
1893         case NL80211_CHAN_WIDTH_80:
1894         case NL80211_CHAN_WIDTH_40:
1895                 if (chandef->center_freq1 > chandef->chan->center_freq)
1896                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1897                 else
1898                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1899                 break;
1900         default:
1901                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1902                 break;
1903         }
1904         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1905             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
1906             chandef->width != NL80211_CHAN_WIDTH_20)
1907                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1908
1909         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1910         ht_oper->stbc_param = 0x0000;
1911
1912         /* It seems that Basic MCS set and Supported MCS set
1913            are identical for the first 10 bytes */
1914         memset(&ht_oper->basic_set, 0, 16);
1915         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1916
1917         return pos + sizeof(struct ieee80211_ht_operation);
1918 }
1919
1920 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
1921                                   const struct ieee80211_ht_operation *ht_oper,
1922                                   struct cfg80211_chan_def *chandef)
1923 {
1924         enum nl80211_channel_type channel_type;
1925
1926         if (!ht_oper) {
1927                 cfg80211_chandef_create(chandef, control_chan,
1928                                         NL80211_CHAN_NO_HT);
1929                 return;
1930         }
1931
1932         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1933         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1934                 channel_type = NL80211_CHAN_HT20;
1935                 break;
1936         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1937                 channel_type = NL80211_CHAN_HT40PLUS;
1938                 break;
1939         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1940                 channel_type = NL80211_CHAN_HT40MINUS;
1941                 break;
1942         default:
1943                 channel_type = NL80211_CHAN_NO_HT;
1944         }
1945
1946         cfg80211_chandef_create(chandef, control_chan, channel_type);
1947 }
1948
1949 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1950                             struct sk_buff *skb, bool need_basic,
1951                             enum ieee80211_band band)
1952 {
1953         struct ieee80211_local *local = sdata->local;
1954         struct ieee80211_supported_band *sband;
1955         int rate;
1956         u8 i, rates, *pos;
1957         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1958
1959         sband = local->hw.wiphy->bands[band];
1960         rates = sband->n_bitrates;
1961         if (rates > 8)
1962                 rates = 8;
1963
1964         if (skb_tailroom(skb) < rates + 2)
1965                 return -ENOMEM;
1966
1967         pos = skb_put(skb, rates + 2);
1968         *pos++ = WLAN_EID_SUPP_RATES;
1969         *pos++ = rates;
1970         for (i = 0; i < rates; i++) {
1971                 u8 basic = 0;
1972                 if (need_basic && basic_rates & BIT(i))
1973                         basic = 0x80;
1974                 rate = sband->bitrates[i].bitrate;
1975                 *pos++ = basic | (u8) (rate / 5);
1976         }
1977
1978         return 0;
1979 }
1980
1981 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1982                                 struct sk_buff *skb, bool need_basic,
1983                                 enum ieee80211_band band)
1984 {
1985         struct ieee80211_local *local = sdata->local;
1986         struct ieee80211_supported_band *sband;
1987         int rate;
1988         u8 i, exrates, *pos;
1989         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1990
1991         sband = local->hw.wiphy->bands[band];
1992         exrates = sband->n_bitrates;
1993         if (exrates > 8)
1994                 exrates -= 8;
1995         else
1996                 exrates = 0;
1997
1998         if (skb_tailroom(skb) < exrates + 2)
1999                 return -ENOMEM;
2000
2001         if (exrates) {
2002                 pos = skb_put(skb, exrates + 2);
2003                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2004                 *pos++ = exrates;
2005                 for (i = 8; i < sband->n_bitrates; i++) {
2006                         u8 basic = 0;
2007                         if (need_basic && basic_rates & BIT(i))
2008                                 basic = 0x80;
2009                         rate = sband->bitrates[i].bitrate;
2010                         *pos++ = basic | (u8) (rate / 5);
2011                 }
2012         }
2013         return 0;
2014 }
2015
2016 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2017 {
2018         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2019         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2020
2021         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2022                 /* non-managed type inferfaces */
2023                 return 0;
2024         }
2025         return ifmgd->ave_beacon_signal;
2026 }
2027 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2028
2029 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2030 {
2031         if (!mcs)
2032                 return 1;
2033
2034         /* TODO: consider rx_highest */
2035
2036         if (mcs->rx_mask[3])
2037                 return 4;
2038         if (mcs->rx_mask[2])
2039                 return 3;
2040         if (mcs->rx_mask[1])
2041                 return 2;
2042         return 1;
2043 }
2044
2045 /**
2046  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2047  * @local: mac80211 hw info struct
2048  * @status: RX status
2049  * @mpdu_len: total MPDU length (including FCS)
2050  * @mpdu_offset: offset into MPDU to calculate timestamp at
2051  *
2052  * This function calculates the RX timestamp at the given MPDU offset, taking
2053  * into account what the RX timestamp was. An offset of 0 will just normalize
2054  * the timestamp to TSF at beginning of MPDU reception.
2055  */
2056 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2057                                      struct ieee80211_rx_status *status,
2058                                      unsigned int mpdu_len,
2059                                      unsigned int mpdu_offset)
2060 {
2061         u64 ts = status->mactime;
2062         struct rate_info ri;
2063         u16 rate;
2064
2065         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2066                 return 0;
2067
2068         memset(&ri, 0, sizeof(ri));
2069
2070         /* Fill cfg80211 rate info */
2071         if (status->flag & RX_FLAG_HT) {
2072                 ri.mcs = status->rate_idx;
2073                 ri.flags |= RATE_INFO_FLAGS_MCS;
2074                 if (status->flag & RX_FLAG_40MHZ)
2075                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2076                 if (status->flag & RX_FLAG_SHORT_GI)
2077                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2078         } else if (status->flag & RX_FLAG_VHT) {
2079                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2080                 ri.mcs = status->rate_idx;
2081                 ri.nss = status->vht_nss;
2082                 if (status->flag & RX_FLAG_40MHZ)
2083                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2084                 if (status->flag & RX_FLAG_80MHZ)
2085                         ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2086                 if (status->flag & RX_FLAG_80P80MHZ)
2087                         ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2088                 if (status->flag & RX_FLAG_160MHZ)
2089                         ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2090                 if (status->flag & RX_FLAG_SHORT_GI)
2091                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2092         } else {
2093                 struct ieee80211_supported_band *sband;
2094
2095                 sband = local->hw.wiphy->bands[status->band];
2096                 ri.legacy = sband->bitrates[status->rate_idx].bitrate;
2097         }
2098
2099         rate = cfg80211_calculate_bitrate(&ri);
2100
2101         /* rewind from end of MPDU */
2102         if (status->flag & RX_FLAG_MACTIME_END)
2103                 ts -= mpdu_len * 8 * 10 / rate;
2104
2105         ts += mpdu_offset * 8 * 10 / rate;
2106
2107         return ts;
2108 }
2109
2110 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2111 {
2112         struct ieee80211_sub_if_data *sdata;
2113
2114         mutex_lock(&local->iflist_mtx);
2115         list_for_each_entry(sdata, &local->interfaces, list) {
2116                 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
2117
2118                 if (sdata->wdev.cac_started) {
2119                         ieee80211_vif_release_channel(sdata);
2120                         cfg80211_cac_event(sdata->dev,
2121                                            NL80211_RADAR_CAC_ABORTED,
2122                                            GFP_KERNEL);
2123                 }
2124         }
2125         mutex_unlock(&local->iflist_mtx);
2126 }
2127
2128 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2129 {
2130         struct ieee80211_local *local =
2131                 container_of(work, struct ieee80211_local, radar_detected_work);
2132         struct cfg80211_chan_def chandef;
2133
2134         ieee80211_dfs_cac_cancel(local);
2135
2136         if (local->use_chanctx)
2137                 /* currently not handled */
2138                 WARN_ON(1);
2139         else {
2140                 cfg80211_chandef_create(&chandef, local->hw.conf.channel,
2141                                         local->hw.conf.channel_type);
2142                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2143         }
2144 }
2145
2146 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2147 {
2148         struct ieee80211_local *local = hw_to_local(hw);
2149
2150         trace_api_radar_detected(local);
2151
2152         ieee80211_queue_work(hw, &local->radar_detected_work);
2153 }
2154 EXPORT_SYMBOL(ieee80211_radar_detected);