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_flush_queues(struct ieee80211_local *local,
 515                             struct ieee80211_sub_if_data *sdata)
 516 {
 517         u32 queues;
 518
 519         if (!local->ops->flush)
 520                 return;
 521
 522         if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
 523                 int ac;
 524
 525                 queues = 0;
 526
 527                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 528                         queues |= BIT(sdata->vif.hw_queue[ac]);
 529                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 530                         queues |= BIT(sdata->vif.cab_queue);
 531         } else {
 532                 /* all queues */
 533                 queues = BIT(local->hw.queues) - 1;
 534         }
 535
 536         drv_flush(local, queues, false);
 537 }
 538
 539 void ieee80211_iterate_active_interfaces(
 540         struct ieee80211_hw *hw, u32 iter_flags,
 541         void (*iterator)(void *data, u8 *mac,
 542                          struct ieee80211_vif *vif),
 543         void *data)
 544 {
 545         struct ieee80211_local *local = hw_to_local(hw);
 546         struct ieee80211_sub_if_data *sdata;
 547
 548         mutex_lock(&local->iflist_mtx);
 549
 550         list_for_each_entry(sdata, &local->interfaces, list) {
 551                 switch (sdata->vif.type) {
 552                 case NL80211_IFTYPE_MONITOR:
 553                 case NL80211_IFTYPE_AP_VLAN:
 554                         continue;
 555                 default:
 556                         break;
 557                 }
 558                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 559                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 560                         continue;
 561                 if (ieee80211_sdata_running(sdata))
 562                         iterator(data, sdata->vif.addr,
 563                                  &sdata->vif);
 564         }
 565
 566         sdata = rcu_dereference_protected(local->monitor_sdata,
 567                                           lockdep_is_held(&local->iflist_mtx));
 568         if (sdata &&
 569             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 570              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 571                 iterator(data, sdata->vif.addr, &sdata->vif);
 572
 573         mutex_unlock(&local->iflist_mtx);
 574 }
 575 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 576
 577 void ieee80211_iterate_active_interfaces_atomic(
 578         struct ieee80211_hw *hw, u32 iter_flags,
 579         void (*iterator)(void *data, u8 *mac,
 580                          struct ieee80211_vif *vif),
 581         void *data)
 582 {
 583         struct ieee80211_local *local = hw_to_local(hw);
 584         struct ieee80211_sub_if_data *sdata;
 585
 586         rcu_read_lock();
 587
 588         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 589                 switch (sdata->vif.type) {
 590                 case NL80211_IFTYPE_MONITOR:
 591                 case NL80211_IFTYPE_AP_VLAN:
 592                         continue;
 593                 default:
 594                         break;
 595                 }
 596                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 597                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 598                         continue;
 599                 if (ieee80211_sdata_running(sdata))
 600                         iterator(data, sdata->vif.addr,
 601                                  &sdata->vif);
 602         }
 603
 604         sdata = rcu_dereference(local->monitor_sdata);
 605         if (sdata &&
 606             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 607              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 608                 iterator(data, sdata->vif.addr, &sdata->vif);
 609
 610         rcu_read_unlock();
 611 }
 612 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 613
 614 /*
 615  * Nothing should have been stuffed into the workqueue during
 616  * the suspend->resume cycle. If this WARN is seen then there
 617  * is a bug with either the driver suspend or something in
 618  * mac80211 stuffing into the workqueue which we haven't yet
 619  * cleared during mac80211's suspend cycle.
 620  */
 621 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 622 {
 623         if (WARN(local->suspended && !local->resuming,
 624                  "queueing ieee80211 work while going to suspend\n"))
 625                 return false;
 626
 627         return true;
 628 }
 629
 630 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 631 {
 632         struct ieee80211_local *local = hw_to_local(hw);
 633
 634         if (!ieee80211_can_queue_work(local))
 635                 return;
 636
 637         queue_work(local->workqueue, work);
 638 }
 639 EXPORT_SYMBOL(ieee80211_queue_work);
 640
 641 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 642                                   struct delayed_work *dwork,
 643                                   unsigned long delay)
 644 {
 645         struct ieee80211_local *local = hw_to_local(hw);
 646
 647         if (!ieee80211_can_queue_work(local))
 648                 return;
 649
 650         queue_delayed_work(local->workqueue, dwork, delay);
 651 }
 652 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 653
 654 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 655                                struct ieee802_11_elems *elems,
 656                                u64 filter, u32 crc)
 657 {
 658         size_t left = len;
 659         u8 *pos = start;
 660         bool calc_crc = filter != 0;
 661         DECLARE_BITMAP(seen_elems, 256);
 662
 663         bitmap_zero(seen_elems, 256);
 664         memset(elems, 0, sizeof(*elems));
 665         elems->ie_start = start;
 666         elems->total_len = len;
 667
 668         while (left >= 2) {
 669                 u8 id, elen;
 670                 bool elem_parse_failed;
 671
 672                 id = *pos++;
 673                 elen = *pos++;
 674                 left -= 2;
 675
 676                 if (elen > left) {
 677                         elems->parse_error = true;
 678                         break;
 679                 }
 680
 681                 switch (id) {
 682                 case WLAN_EID_SSID:
 683                 case WLAN_EID_SUPP_RATES:
 684                 case WLAN_EID_FH_PARAMS:
 685                 case WLAN_EID_DS_PARAMS:
 686                 case WLAN_EID_CF_PARAMS:
 687                 case WLAN_EID_TIM:
 688                 case WLAN_EID_IBSS_PARAMS:
 689                 case WLAN_EID_CHALLENGE:
 690                 case WLAN_EID_RSN:
 691                 case WLAN_EID_ERP_INFO:
 692                 case WLAN_EID_EXT_SUPP_RATES:
 693                 case WLAN_EID_HT_CAPABILITY:
 694                 case WLAN_EID_HT_OPERATION:
 695                 case WLAN_EID_VHT_CAPABILITY:
 696                 case WLAN_EID_VHT_OPERATION:
 697                 case WLAN_EID_MESH_ID:
 698                 case WLAN_EID_MESH_CONFIG:
 699                 case WLAN_EID_PEER_MGMT:
 700                 case WLAN_EID_PREQ:
 701                 case WLAN_EID_PREP:
 702                 case WLAN_EID_PERR:
 703                 case WLAN_EID_RANN:
 704                 case WLAN_EID_CHANNEL_SWITCH:
 705                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 706                 case WLAN_EID_COUNTRY:
 707                 case WLAN_EID_PWR_CONSTRAINT:
 708                 case WLAN_EID_TIMEOUT_INTERVAL:
 709                         if (test_bit(id, seen_elems)) {
 710                                 elems->parse_error = true;
 711                                 left -= elen;
 712                                 pos += elen;
 713                                 continue;
 714                         }
 715                         break;
 716                 }
 717
 718                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 719                         crc = crc32_be(crc, pos - 2, elen + 2);
 720
 721                 elem_parse_failed = false;
 722
 723                 switch (id) {
 724                 case WLAN_EID_SSID:
 725                         elems->ssid = pos;
 726                         elems->ssid_len = elen;
 727                         break;
 728                 case WLAN_EID_SUPP_RATES:
 729                         elems->supp_rates = pos;
 730                         elems->supp_rates_len = elen;
 731                         break;
 732                 case WLAN_EID_FH_PARAMS:
 733                         elems->fh_params = pos;
 734                         elems->fh_params_len = elen;
 735                         break;
 736                 case WLAN_EID_DS_PARAMS:
 737                         elems->ds_params = pos;
 738                         elems->ds_params_len = elen;
 739                         break;
 740                 case WLAN_EID_CF_PARAMS:
 741                         elems->cf_params = pos;
 742                         elems->cf_params_len = elen;
 743                         break;
 744                 case WLAN_EID_TIM:
 745                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 746                                 elems->tim = (void *)pos;
 747                                 elems->tim_len = elen;
 748                         } else
 749                                 elem_parse_failed = true;
 750                         break;
 751                 case WLAN_EID_IBSS_PARAMS:
 752                         elems->ibss_params = pos;
 753                         elems->ibss_params_len = elen;
 754                         break;
 755                 case WLAN_EID_CHALLENGE:
 756                         elems->challenge = pos;
 757                         elems->challenge_len = elen;
 758                         break;
 759                 case WLAN_EID_VENDOR_SPECIFIC:
 760                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 761                             pos[2] == 0xf2) {
 762                                 /* Microsoft OUI (00:50:F2) */
 763
 764                                 if (calc_crc)
 765                                         crc = crc32_be(crc, pos - 2, elen + 2);
 766
 767                                 if (elen >= 5 && pos[3] == 2) {
 768                                         /* OUI Type 2 - WMM IE */
 769                                         if (pos[4] == 0) {
 770                                                 elems->wmm_info = pos;
 771                                                 elems->wmm_info_len = elen;
 772                                         } else if (pos[4] == 1) {
 773                                                 elems->wmm_param = pos;
 774                                                 elems->wmm_param_len = elen;
 775                                         }
 776                                 }
 777                         }
 778                         break;
 779                 case WLAN_EID_RSN:
 780                         elems->rsn = pos;
 781                         elems->rsn_len = elen;
 782                         break;
 783                 case WLAN_EID_ERP_INFO:
 784                         elems->erp_info = pos;
 785                         elems->erp_info_len = elen;
 786                         break;
 787                 case WLAN_EID_EXT_SUPP_RATES:
 788                         elems->ext_supp_rates = pos;
 789                         elems->ext_supp_rates_len = elen;
 790                         break;
 791                 case WLAN_EID_HT_CAPABILITY:
 792                         if (elen >= sizeof(struct ieee80211_ht_cap))
 793                                 elems->ht_cap_elem = (void *)pos;
 794                         else
 795                                 elem_parse_failed = true;
 796                         break;
 797                 case WLAN_EID_HT_OPERATION:
 798                         if (elen >= sizeof(struct ieee80211_ht_operation))
 799                                 elems->ht_operation = (void *)pos;
 800                         else
 801                                 elem_parse_failed = true;
 802                         break;
 803                 case WLAN_EID_VHT_CAPABILITY:
 804                         if (elen >= sizeof(struct ieee80211_vht_cap))
 805                                 elems->vht_cap_elem = (void *)pos;
 806                         else
 807                                 elem_parse_failed = true;
 808                         break;
 809                 case WLAN_EID_VHT_OPERATION:
 810                         if (elen >= sizeof(struct ieee80211_vht_operation))
 811                                 elems->vht_operation = (void *)pos;
 812                         else
 813                                 elem_parse_failed = true;
 814                         break;
 815                 case WLAN_EID_OPMODE_NOTIF:
 816                         if (elen > 0)
 817                                 elems->opmode_notif = pos;
 818                         else
 819                                 elem_parse_failed = true;
 820                         break;
 821                 case WLAN_EID_MESH_ID:
 822                         elems->mesh_id = pos;
 823                         elems->mesh_id_len = elen;
 824                         break;
 825                 case WLAN_EID_MESH_CONFIG:
 826                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 827                                 elems->mesh_config = (void *)pos;
 828                         else
 829                                 elem_parse_failed = true;
 830                         break;
 831                 case WLAN_EID_PEER_MGMT:
 832                         elems->peering = pos;
 833                         elems->peering_len = elen;
 834                         break;
 835                 case WLAN_EID_MESH_AWAKE_WINDOW:
 836                         if (elen >= 2)
 837                                 elems->awake_window = (void *)pos;
 838                         break;
 839                 case WLAN_EID_PREQ:
 840                         elems->preq = pos;
 841                         elems->preq_len = elen;
 842                         break;
 843                 case WLAN_EID_PREP:
 844                         elems->prep = pos;
 845                         elems->prep_len = elen;
 846                         break;
 847                 case WLAN_EID_PERR:
 848                         elems->perr = pos;
 849                         elems->perr_len = elen;
 850                         break;
 851                 case WLAN_EID_RANN:
 852                         if (elen >= sizeof(struct ieee80211_rann_ie))
 853                                 elems->rann = (void *)pos;
 854                         else
 855                                 elem_parse_failed = true;
 856                         break;
 857                 case WLAN_EID_CHANNEL_SWITCH:
 858                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 859                                 elem_parse_failed = true;
 860                                 break;
 861                         }
 862                         elems->ch_switch_ie = (void *)pos;
 863                         break;
 864                 case WLAN_EID_QUIET:
 865                         if (!elems->quiet_elem) {
 866                                 elems->quiet_elem = pos;
 867                                 elems->quiet_elem_len = elen;
 868                         }
 869                         elems->num_of_quiet_elem++;
 870                         break;
 871                 case WLAN_EID_COUNTRY:
 872                         elems->country_elem = pos;
 873                         elems->country_elem_len = elen;
 874                         break;
 875                 case WLAN_EID_PWR_CONSTRAINT:
 876                         if (elen != 1) {
 877                                 elem_parse_failed = true;
 878                                 break;
 879                         }
 880                         elems->pwr_constr_elem = pos;
 881                         break;
 882                 case WLAN_EID_TIMEOUT_INTERVAL:
 883                         elems->timeout_int = pos;
 884                         elems->timeout_int_len = elen;
 885                         break;
 886                 default:
 887                         break;
 888                 }
 889
 890                 if (elem_parse_failed)
 891                         elems->parse_error = true;
 892                 else
 893                         __set_bit(id, seen_elems);
 894
 895                 left -= elen;
 896                 pos += elen;
 897         }
 898
 899         if (left != 0)
 900                 elems->parse_error = true;
 901
 902         return crc;
 903 }
 904
 905 void ieee802_11_parse_elems(u8 *start, size_t len,
 906                             struct ieee802_11_elems *elems)
 907 {
 908         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 909 }
 910
 911 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 912                                bool bss_notify)
 913 {
 914         struct ieee80211_local *local = sdata->local;
 915         struct ieee80211_tx_queue_params qparam;
 916         struct ieee80211_chanctx_conf *chanctx_conf;
 917         int ac;
 918         bool use_11b, enable_qos;
 919         int aCWmin, aCWmax;
 920
 921         if (!local->ops->conf_tx)
 922                 return;
 923
 924         if (local->hw.queues < IEEE80211_NUM_ACS)
 925                 return;
 926
 927         memset(&qparam, 0, sizeof(qparam));
 928
 929         rcu_read_lock();
 930         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 931         use_11b = (chanctx_conf &&
 932                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
 933                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 934         rcu_read_unlock();
 935
 936         /*
 937          * By default disable QoS in STA mode for old access points, which do
 938          * not support 802.11e. New APs will provide proper queue parameters,
 939          * that we will configure later.
 940          */
 941         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 942
 943         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 944                 /* Set defaults according to 802.11-2007 Table 7-37 */
 945                 aCWmax = 1023;
 946                 if (use_11b)
 947                         aCWmin = 31;
 948                 else
 949                         aCWmin = 15;
 950
 951                 if (enable_qos) {
 952                         switch (ac) {
 953                         case IEEE80211_AC_BK:
 954                                 qparam.cw_max = aCWmax;
 955                                 qparam.cw_min = aCWmin;
 956                                 qparam.txop = 0;
 957                                 qparam.aifs = 7;
 958                                 break;
 959                         /* never happens but let's not leave undefined */
 960                         default:
 961                         case IEEE80211_AC_BE:
 962                                 qparam.cw_max = aCWmax;
 963                                 qparam.cw_min = aCWmin;
 964                                 qparam.txop = 0;
 965                                 qparam.aifs = 3;
 966                                 break;
 967                         case IEEE80211_AC_VI:
 968                                 qparam.cw_max = aCWmin;
 969                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 970                                 if (use_11b)
 971                                         qparam.txop = 6016/32;
 972                                 else
 973                                         qparam.txop = 3008/32;
 974                                 qparam.aifs = 2;
 975                                 break;
 976                         case IEEE80211_AC_VO:
 977                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 978                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 979                                 if (use_11b)
 980                                         qparam.txop = 3264/32;
 981                                 else
 982                                         qparam.txop = 1504/32;
 983                                 qparam.aifs = 2;
 984                                 break;
 985                         }
 986                 } else {
 987                         /* Confiure old 802.11b/g medium access rules. */
 988                         qparam.cw_max = aCWmax;
 989                         qparam.cw_min = aCWmin;
 990                         qparam.txop = 0;
 991                         qparam.aifs = 2;
 992                 }
 993
 994                 qparam.uapsd = false;
 995
 996                 sdata->tx_conf[ac] = qparam;
 997                 drv_conf_tx(local, sdata, ac, &qparam);
 998         }
 999
1000         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1001             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1002                 sdata->vif.bss_conf.qos = enable_qos;
1003                 if (bss_notify)
1004                         ieee80211_bss_info_change_notify(sdata,
1005                                                          BSS_CHANGED_QOS);
1006         }
1007 }
1008
1009 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
1010                                   const size_t supp_rates_len,
1011                                   const u8 *supp_rates)
1012 {
1013         struct ieee80211_chanctx_conf *chanctx_conf;
1014         int i, have_higher_than_11mbit = 0;
1015
1016         /* cf. IEEE 802.11 9.2.12 */
1017         for (i = 0; i < supp_rates_len; i++)
1018                 if ((supp_rates[i] & 0x7f) * 5 > 110)
1019                         have_higher_than_11mbit = 1;
1020
1021         rcu_read_lock();
1022         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1023
1024         if (chanctx_conf &&
1025             chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ &&
1026             have_higher_than_11mbit)
1027                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1028         else
1029                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1030         rcu_read_unlock();
1031
1032         ieee80211_set_wmm_default(sdata, true);
1033 }
1034
1035 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
1036                               enum ieee80211_band band)
1037 {
1038         struct ieee80211_supported_band *sband;
1039         struct ieee80211_rate *bitrates;
1040         u32 mandatory_rates;
1041         enum ieee80211_rate_flags mandatory_flag;
1042         int i;
1043
1044         sband = local->hw.wiphy->bands[band];
1045         if (WARN_ON(!sband))
1046                 return 1;
1047
1048         if (band == IEEE80211_BAND_2GHZ)
1049                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
1050         else
1051                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
1052
1053         bitrates = sband->bitrates;
1054         mandatory_rates = 0;
1055         for (i = 0; i < sband->n_bitrates; i++)
1056                 if (bitrates[i].flags & mandatory_flag)
1057                         mandatory_rates |= BIT(i);
1058         return mandatory_rates;
1059 }
1060
1061 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1062                          u16 transaction, u16 auth_alg, u16 status,
1063                          const u8 *extra, size_t extra_len, const u8 *da,
1064                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1065                          u32 tx_flags)
1066 {
1067         struct ieee80211_local *local = sdata->local;
1068         struct sk_buff *skb;
1069         struct ieee80211_mgmt *mgmt;
1070         int err;
1071
1072         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1073                             sizeof(*mgmt) + 6 + extra_len);
1074         if (!skb)
1075                 return;
1076
1077         skb_reserve(skb, local->hw.extra_tx_headroom);
1078
1079         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1080         memset(mgmt, 0, 24 + 6);
1081         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1082                                           IEEE80211_STYPE_AUTH);
1083         memcpy(mgmt->da, da, ETH_ALEN);
1084         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1085         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1086         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1087         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1088         mgmt->u.auth.status_code = cpu_to_le16(status);
1089         if (extra)
1090                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1091
1092         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1093                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1094                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1095                 WARN_ON(err);
1096         }
1097
1098         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1099                                         tx_flags;
1100         ieee80211_tx_skb(sdata, skb);
1101 }
1102
1103 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1104                                     const u8 *bssid, u16 stype, u16 reason,
1105                                     bool send_frame, u8 *frame_buf)
1106 {
1107         struct ieee80211_local *local = sdata->local;
1108         struct sk_buff *skb;
1109         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1110
1111         /* build frame */
1112         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1113         mgmt->duration = 0; /* initialize only */
1114         mgmt->seq_ctrl = 0; /* initialize only */
1115         memcpy(mgmt->da, bssid, ETH_ALEN);
1116         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1117         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1118         /* u.deauth.reason_code == u.disassoc.reason_code */
1119         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1120
1121         if (send_frame) {
1122                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1123                                     IEEE80211_DEAUTH_FRAME_LEN);
1124                 if (!skb)
1125                         return;
1126
1127                 skb_reserve(skb, local->hw.extra_tx_headroom);
1128
1129                 /* copy in frame */
1130                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1131                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1132
1133                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1134                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1135                         IEEE80211_SKB_CB(skb)->flags |=
1136                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1137
1138                 ieee80211_tx_skb(sdata, skb);
1139         }
1140 }
1141
1142 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1143                              size_t buffer_len, const u8 *ie, size_t ie_len,
1144                              enum ieee80211_band band, u32 rate_mask,
1145                              u8 channel)
1146 {
1147         struct ieee80211_supported_band *sband;
1148         u8 *pos = buffer, *end = buffer + buffer_len;
1149         size_t offset = 0, noffset;
1150         int supp_rates_len, i;
1151         u8 rates[32];
1152         int num_rates;
1153         int ext_rates_len;
1154
1155         sband = local->hw.wiphy->bands[band];
1156         if (WARN_ON_ONCE(!sband))
1157                 return 0;
1158
1159         num_rates = 0;
1160         for (i = 0; i < sband->n_bitrates; i++) {
1161                 if ((BIT(i) & rate_mask) == 0)
1162                         continue; /* skip rate */
1163                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1164         }
1165
1166         supp_rates_len = min_t(int, num_rates, 8);
1167
1168         if (end - pos < 2 + supp_rates_len)
1169                 goto out_err;
1170         *pos++ = WLAN_EID_SUPP_RATES;
1171         *pos++ = supp_rates_len;
1172         memcpy(pos, rates, supp_rates_len);
1173         pos += supp_rates_len;
1174
1175         /* insert "request information" if in custom IEs */
1176         if (ie && ie_len) {
1177                 static const u8 before_extrates[] = {
1178                         WLAN_EID_SSID,
1179                         WLAN_EID_SUPP_RATES,
1180                         WLAN_EID_REQUEST,
1181                 };
1182                 noffset = ieee80211_ie_split(ie, ie_len,
1183                                              before_extrates,
1184                                              ARRAY_SIZE(before_extrates),
1185                                              offset);
1186                 if (end - pos < noffset - offset)
1187                         goto out_err;
1188                 memcpy(pos, ie + offset, noffset - offset);
1189                 pos += noffset - offset;
1190                 offset = noffset;
1191         }
1192
1193         ext_rates_len = num_rates - supp_rates_len;
1194         if (ext_rates_len > 0) {
1195                 if (end - pos < 2 + ext_rates_len)
1196                         goto out_err;
1197                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1198                 *pos++ = ext_rates_len;
1199                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1200                 pos += ext_rates_len;
1201         }
1202
1203         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1204                 if (end - pos < 3)
1205                         goto out_err;
1206                 *pos++ = WLAN_EID_DS_PARAMS;
1207                 *pos++ = 1;
1208                 *pos++ = channel;
1209         }
1210
1211         /* insert custom IEs that go before HT */
1212         if (ie && ie_len) {
1213                 static const u8 before_ht[] = {
1214                         WLAN_EID_SSID,
1215                         WLAN_EID_SUPP_RATES,
1216                         WLAN_EID_REQUEST,
1217                         WLAN_EID_EXT_SUPP_RATES,
1218                         WLAN_EID_DS_PARAMS,
1219                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1220                 };
1221                 noffset = ieee80211_ie_split(ie, ie_len,
1222                                              before_ht, ARRAY_SIZE(before_ht),
1223                                              offset);
1224                 if (end - pos < noffset - offset)
1225                         goto out_err;
1226                 memcpy(pos, ie + offset, noffset - offset);
1227                 pos += noffset - offset;
1228                 offset = noffset;
1229         }
1230
1231         if (sband->ht_cap.ht_supported) {
1232                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1233                         goto out_err;
1234                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1235                                                 sband->ht_cap.cap);
1236         }
1237
1238         /*
1239          * If adding more here, adjust code in main.c
1240          * that calculates local->scan_ies_len.
1241          */
1242
1243         /* add any remaining custom IEs */
1244         if (ie && ie_len) {
1245                 noffset = ie_len;
1246                 if (end - pos < noffset - offset)
1247                         goto out_err;
1248                 memcpy(pos, ie + offset, noffset - offset);
1249                 pos += noffset - offset;
1250         }
1251
1252         if (sband->vht_cap.vht_supported) {
1253                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1254                         goto out_err;
1255                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1256                                                  sband->vht_cap.cap);
1257         }
1258
1259         return pos - buffer;
1260  out_err:
1261         WARN_ONCE(1, "not enough space for preq IEs\n");
1262         return pos - buffer;
1263 }
1264
1265 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1266                                           u8 *dst, u32 ratemask,
1267                                           struct ieee80211_channel *chan,
1268                                           const u8 *ssid, size_t ssid_len,
1269                                           const u8 *ie, size_t ie_len,
1270                                           bool directed)
1271 {
1272         struct ieee80211_local *local = sdata->local;
1273         struct sk_buff *skb;
1274         struct ieee80211_mgmt *mgmt;
1275         u8 chan_no;
1276         int ies_len;
1277
1278         /*
1279          * Do not send DS Channel parameter for directed probe requests
1280          * in order to maximize the chance that we get a response.  Some
1281          * badly-behaved APs don't respond when this parameter is included.
1282          */
1283         if (directed)
1284                 chan_no = 0;
1285         else
1286                 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1287
1288         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1289                                      ssid, ssid_len, 100 + ie_len);
1290         if (!skb)
1291                 return NULL;
1292
1293         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1294                                            skb_tailroom(skb),
1295                                            ie, ie_len, chan->band,
1296                                            ratemask, chan_no);
1297         skb_put(skb, ies_len);
1298
1299         if (dst) {
1300                 mgmt = (struct ieee80211_mgmt *) skb->data;
1301                 memcpy(mgmt->da, dst, ETH_ALEN);
1302                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1303         }
1304
1305         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1306
1307         return skb;
1308 }
1309
1310 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1311                               const u8 *ssid, size_t ssid_len,
1312                               const u8 *ie, size_t ie_len,
1313                               u32 ratemask, bool directed, u32 tx_flags,
1314                               struct ieee80211_channel *channel, bool scan)
1315 {
1316         struct sk_buff *skb;
1317
1318         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1319                                         ssid, ssid_len,
1320                                         ie, ie_len, directed);
1321         if (skb) {
1322                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1323                 if (scan)
1324                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1325                 else
1326                         ieee80211_tx_skb(sdata, skb);
1327         }
1328 }
1329
1330 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1331                             struct ieee802_11_elems *elems,
1332                             enum ieee80211_band band, u32 *basic_rates)
1333 {
1334         struct ieee80211_supported_band *sband;
1335         struct ieee80211_rate *bitrates;
1336         size_t num_rates;
1337         u32 supp_rates;
1338         int i, j;
1339         sband = local->hw.wiphy->bands[band];
1340
1341         if (WARN_ON(!sband))
1342                 return 1;
1343
1344         bitrates = sband->bitrates;
1345         num_rates = sband->n_bitrates;
1346         supp_rates = 0;
1347         for (i = 0; i < elems->supp_rates_len +
1348                      elems->ext_supp_rates_len; i++) {
1349                 u8 rate = 0;
1350                 int own_rate;
1351                 bool is_basic;
1352                 if (i < elems->supp_rates_len)
1353                         rate = elems->supp_rates[i];
1354                 else if (elems->ext_supp_rates)
1355                         rate = elems->ext_supp_rates
1356                                 [i - elems->supp_rates_len];
1357                 own_rate = 5 * (rate & 0x7f);
1358                 is_basic = !!(rate & 0x80);
1359
1360                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1361                         continue;
1362
1363                 for (j = 0; j < num_rates; j++) {
1364                         if (bitrates[j].bitrate == own_rate) {
1365                                 supp_rates |= BIT(j);
1366                                 if (basic_rates && is_basic)
1367                                         *basic_rates |= BIT(j);
1368                         }
1369                 }
1370         }
1371         return supp_rates;
1372 }
1373
1374 void ieee80211_stop_device(struct ieee80211_local *local)
1375 {
1376         ieee80211_led_radio(local, false);
1377         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1378
1379         cancel_work_sync(&local->reconfig_filter);
1380
1381         flush_workqueue(local->workqueue);
1382         drv_stop(local);
1383 }
1384
1385 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1386                                      struct ieee80211_sub_if_data *sdata)
1387 {
1388         struct ieee80211_chanctx_conf *conf;
1389         struct ieee80211_chanctx *ctx;
1390
1391         if (!local->use_chanctx)
1392                 return;
1393
1394         mutex_lock(&local->chanctx_mtx);
1395         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1396                                          lockdep_is_held(&local->chanctx_mtx));
1397         if (conf) {
1398                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1399                 drv_assign_vif_chanctx(local, sdata, ctx);
1400         }
1401         mutex_unlock(&local->chanctx_mtx);
1402 }
1403
1404 int ieee80211_reconfig(struct ieee80211_local *local)
1405 {
1406         struct ieee80211_hw *hw = &local->hw;
1407         struct ieee80211_sub_if_data *sdata;
1408         struct ieee80211_chanctx *ctx;
1409         struct sta_info *sta;
1410         int res, i;
1411         bool reconfig_due_to_wowlan = false;
1412
1413 #ifdef CONFIG_PM
1414         if (local->suspended)
1415                 local->resuming = true;
1416
1417         if (local->wowlan) {
1418                 local->wowlan = false;
1419                 res = drv_resume(local);
1420                 if (res < 0) {
1421                         local->resuming = false;
1422                         return res;
1423                 }
1424                 if (res == 0)
1425                         goto wake_up;
1426                 WARN_ON(res > 1);
1427                 /*
1428                  * res is 1, which means the driver requested
1429                  * to go through a regular reset on wakeup.
1430                  */
1431                 reconfig_due_to_wowlan = true;
1432         }
1433 #endif
1434         /* everything else happens only if HW was up & running */
1435         if (!local->open_count)
1436                 goto wake_up;
1437
1438         /*
1439          * Upon resume hardware can sometimes be goofy due to
1440          * various platform / driver / bus issues, so restarting
1441          * the device may at times not work immediately. Propagate
1442          * the error.
1443          */
1444         res = drv_start(local);
1445         if (res) {
1446                 WARN(local->suspended, "Hardware became unavailable "
1447                      "upon resume. This could be a software issue "
1448                      "prior to suspend or a hardware issue.\n");
1449                 return res;
1450         }
1451
1452         /* setup fragmentation threshold */
1453         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1454
1455         /* setup RTS threshold */
1456         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1457
1458         /* reset coverage class */
1459         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1460
1461         ieee80211_led_radio(local, true);
1462         ieee80211_mod_tpt_led_trig(local,
1463                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1464
1465         /* add interfaces */
1466         sdata = rtnl_dereference(local->monitor_sdata);
1467         if (sdata) {
1468                 res = drv_add_interface(local, sdata);
1469                 if (WARN_ON(res)) {
1470                         rcu_assign_pointer(local->monitor_sdata, NULL);
1471                         synchronize_net();
1472                         kfree(sdata);
1473                 }
1474         }
1475
1476         list_for_each_entry(sdata, &local->interfaces, list) {
1477                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1478                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1479                     ieee80211_sdata_running(sdata))
1480                         res = drv_add_interface(local, sdata);
1481         }
1482
1483         /* add channel contexts */
1484         if (local->use_chanctx) {
1485                 mutex_lock(&local->chanctx_mtx);
1486                 list_for_each_entry(ctx, &local->chanctx_list, list)
1487                         WARN_ON(drv_add_chanctx(local, ctx));
1488                 mutex_unlock(&local->chanctx_mtx);
1489         }
1490
1491         list_for_each_entry(sdata, &local->interfaces, list) {
1492                 if (!ieee80211_sdata_running(sdata))
1493                         continue;
1494                 ieee80211_assign_chanctx(local, sdata);
1495         }
1496
1497         sdata = rtnl_dereference(local->monitor_sdata);
1498         if (sdata && ieee80211_sdata_running(sdata))
1499                 ieee80211_assign_chanctx(local, sdata);
1500
1501         /* add STAs back */
1502         mutex_lock(&local->sta_mtx);
1503         list_for_each_entry(sta, &local->sta_list, list) {
1504                 enum ieee80211_sta_state state;
1505
1506                 if (!sta->uploaded)
1507                         continue;
1508
1509                 /* AP-mode stations will be added later */
1510                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1511                         continue;
1512
1513                 for (state = IEEE80211_STA_NOTEXIST;
1514                      state < sta->sta_state; state++)
1515                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1516                                               state + 1));
1517         }
1518         mutex_unlock(&local->sta_mtx);
1519
1520         /* reconfigure tx conf */
1521         if (hw->queues >= IEEE80211_NUM_ACS) {
1522                 list_for_each_entry(sdata, &local->interfaces, list) {
1523                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1524                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1525                             !ieee80211_sdata_running(sdata))
1526                                 continue;
1527
1528                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1529                                 drv_conf_tx(local, sdata, i,
1530                                             &sdata->tx_conf[i]);
1531                 }
1532         }
1533
1534         /* reconfigure hardware */
1535         ieee80211_hw_config(local, ~0);
1536
1537         ieee80211_configure_filter(local);
1538
1539         /* Finally also reconfigure all the BSS information */
1540         list_for_each_entry(sdata, &local->interfaces, list) {
1541                 u32 changed;
1542
1543                 if (!ieee80211_sdata_running(sdata))
1544                         continue;
1545
1546                 /* common change flags for all interface types */
1547                 changed = BSS_CHANGED_ERP_CTS_PROT |
1548                           BSS_CHANGED_ERP_PREAMBLE |
1549                           BSS_CHANGED_ERP_SLOT |
1550                           BSS_CHANGED_HT |
1551                           BSS_CHANGED_BASIC_RATES |
1552                           BSS_CHANGED_BEACON_INT |
1553                           BSS_CHANGED_BSSID |
1554                           BSS_CHANGED_CQM |
1555                           BSS_CHANGED_QOS |
1556                           BSS_CHANGED_IDLE |
1557                           BSS_CHANGED_TXPOWER;
1558
1559                 switch (sdata->vif.type) {
1560                 case NL80211_IFTYPE_STATION:
1561                         changed |= BSS_CHANGED_ASSOC |
1562                                    BSS_CHANGED_ARP_FILTER |
1563                                    BSS_CHANGED_PS;
1564
1565                         if (sdata->u.mgd.dtim_period)
1566                                 changed |= BSS_CHANGED_DTIM_PERIOD;
1567
1568                         mutex_lock(&sdata->u.mgd.mtx);
1569                         ieee80211_bss_info_change_notify(sdata, changed);
1570                         mutex_unlock(&sdata->u.mgd.mtx);
1571                         break;
1572                 case NL80211_IFTYPE_ADHOC:
1573                         changed |= BSS_CHANGED_IBSS;
1574                         /* fall through */
1575                 case NL80211_IFTYPE_AP:
1576                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1577
1578                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1579                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1580
1581                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1582                                         drv_start_ap(local, sdata);
1583                         }
1584
1585                         /* fall through */
1586                 case NL80211_IFTYPE_MESH_POINT:
1587                         if (sdata->vif.bss_conf.enable_beacon) {
1588                                 changed |= BSS_CHANGED_BEACON |
1589                                            BSS_CHANGED_BEACON_ENABLED;
1590                                 ieee80211_bss_info_change_notify(sdata, changed);
1591                         }
1592                         break;
1593                 case NL80211_IFTYPE_WDS:
1594                         break;
1595                 case NL80211_IFTYPE_AP_VLAN:
1596                 case NL80211_IFTYPE_MONITOR:
1597                         /* ignore virtual */
1598                         break;
1599                 case NL80211_IFTYPE_P2P_DEVICE:
1600                         changed = BSS_CHANGED_IDLE;
1601                         break;
1602                 case NL80211_IFTYPE_UNSPECIFIED:
1603                 case NUM_NL80211_IFTYPES:
1604                 case NL80211_IFTYPE_P2P_CLIENT:
1605                 case NL80211_IFTYPE_P2P_GO:
1606                         WARN_ON(1);
1607                         break;
1608                 }
1609         }
1610
1611         ieee80211_recalc_ps(local, -1);
1612
1613         /*
1614          * The sta might be in psm against the ap (e.g. because
1615          * this was the state before a hw restart), so we
1616          * explicitly send a null packet in order to make sure
1617          * it'll sync against the ap (and get out of psm).
1618          */
1619         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1620                 list_for_each_entry(sdata, &local->interfaces, list) {
1621                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1622                                 continue;
1623                         if (!sdata->u.mgd.associated)
1624                                 continue;
1625
1626                         ieee80211_send_nullfunc(local, sdata, 0);
1627                 }
1628         }
1629
1630         /* APs are now beaconing, add back stations */
1631         mutex_lock(&local->sta_mtx);
1632         list_for_each_entry(sta, &local->sta_list, list) {
1633                 enum ieee80211_sta_state state;
1634
1635                 if (!sta->uploaded)
1636                         continue;
1637
1638                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1639                         continue;
1640
1641                 for (state = IEEE80211_STA_NOTEXIST;
1642                      state < sta->sta_state; state++)
1643                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1644                                               state + 1));
1645         }
1646         mutex_unlock(&local->sta_mtx);
1647
1648         /* add back keys */
1649         list_for_each_entry(sdata, &local->interfaces, list)
1650                 if (ieee80211_sdata_running(sdata))
1651                         ieee80211_enable_keys(sdata);
1652
1653  wake_up:
1654         local->in_reconfig = false;
1655         barrier();
1656
1657         /*
1658          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1659          * sessions can be established after a resume.
1660          *
1661          * Also tear down aggregation sessions since reconfiguring
1662          * them in a hardware restart scenario is not easily done
1663          * right now, and the hardware will have lost information
1664          * about the sessions, but we and the AP still think they
1665          * are active. This is really a workaround though.
1666          */
1667         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1668                 mutex_lock(&local->sta_mtx);
1669
1670                 list_for_each_entry(sta, &local->sta_list, list) {
1671                         ieee80211_sta_tear_down_BA_sessions(
1672                                         sta, AGG_STOP_LOCAL_REQUEST);
1673                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1674                 }
1675
1676                 mutex_unlock(&local->sta_mtx);
1677         }
1678
1679         ieee80211_wake_queues_by_reason(hw,
1680                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1681
1682         /*
1683          * If this is for hw restart things are still running.
1684          * We may want to change that later, however.
1685          */
1686         if (!local->suspended || reconfig_due_to_wowlan)
1687                 drv_restart_complete(local);
1688
1689         if (!local->suspended)
1690                 return 0;
1691
1692 #ifdef CONFIG_PM
1693         /* first set suspended false, then resuming */
1694         local->suspended = false;
1695         mb();
1696         local->resuming = false;
1697
1698         mod_timer(&local->sta_cleanup, jiffies + 1);
1699 #else
1700         WARN_ON(1);
1701 #endif
1702         return 0;
1703 }
1704
1705 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1706 {
1707         struct ieee80211_sub_if_data *sdata;
1708         struct ieee80211_local *local;
1709         struct ieee80211_key *key;
1710
1711         if (WARN_ON(!vif))
1712                 return;
1713
1714         sdata = vif_to_sdata(vif);
1715         local = sdata->local;
1716
1717         if (WARN_ON(!local->resuming))
1718                 return;
1719
1720         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1721                 return;
1722
1723         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1724
1725         mutex_lock(&local->key_mtx);
1726         list_for_each_entry(key, &sdata->key_list, list)
1727                 key->flags |= KEY_FLAG_TAINTED;
1728         mutex_unlock(&local->key_mtx);
1729 }
1730 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1731
1732 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1733 {
1734         struct ieee80211_local *local = sdata->local;
1735         struct ieee80211_chanctx_conf *chanctx_conf;
1736         struct ieee80211_chanctx *chanctx;
1737
1738         mutex_lock(&local->chanctx_mtx);
1739
1740         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1741                                         lockdep_is_held(&local->chanctx_mtx));
1742
1743         if (WARN_ON_ONCE(!chanctx_conf))
1744                 goto unlock;
1745
1746         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1747         ieee80211_recalc_smps_chanctx(local, chanctx);
1748  unlock:
1749         mutex_unlock(&local->chanctx_mtx);
1750 }
1751
1752 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1753 {
1754         int i;
1755
1756         for (i = 0; i < n_ids; i++)
1757                 if (ids[i] == id)
1758                         return true;
1759         return false;
1760 }
1761
1762 /**
1763  * ieee80211_ie_split - split an IE buffer according to ordering
1764  *
1765  * @ies: the IE buffer
1766  * @ielen: the length of the IE buffer
1767  * @ids: an array with element IDs that are allowed before
1768  *      the split
1769  * @n_ids: the size of the element ID array
1770  * @offset: offset where to start splitting in the buffer
1771  *
1772  * This function splits an IE buffer by updating the @offset
1773  * variable to point to the location where the buffer should be
1774  * split.
1775  *
1776  * It assumes that the given IE buffer is well-formed, this
1777  * has to be guaranteed by the caller!
1778  *
1779  * It also assumes that the IEs in the buffer are ordered
1780  * correctly, if not the result of using this function will not
1781  * be ordered correctly either, i.e. it does no reordering.
1782  *
1783  * The function returns the offset where the next part of the
1784  * buffer starts, which may be @ielen if the entire (remainder)
1785  * of the buffer should be used.
1786  */
1787 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1788                           const u8 *ids, int n_ids, size_t offset)
1789 {
1790         size_t pos = offset;
1791
1792         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1793                 pos += 2 + ies[pos + 1];
1794
1795         return pos;
1796 }
1797
1798 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1799 {
1800         size_t pos = offset;
1801
1802         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1803                 pos += 2 + ies[pos + 1];
1804
1805         return pos;
1806 }
1807
1808 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1809                                             int rssi_min_thold,
1810                                             int rssi_max_thold)
1811 {
1812         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1813
1814         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1815                 return;
1816
1817         /*
1818          * Scale up threshold values before storing it, as the RSSI averaging
1819          * algorithm uses a scaled up value as well. Change this scaling
1820          * factor if the RSSI averaging algorithm changes.
1821          */
1822         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1823         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1824 }
1825
1826 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1827                                     int rssi_min_thold,
1828                                     int rssi_max_thold)
1829 {
1830         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1831
1832         WARN_ON(rssi_min_thold == rssi_max_thold ||
1833                 rssi_min_thold > rssi_max_thold);
1834
1835         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1836                                        rssi_max_thold);
1837 }
1838 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1839
1840 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1841 {
1842         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1843
1844         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1845 }
1846 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1847
1848 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1849                               u16 cap)
1850 {
1851         __le16 tmp;
1852
1853         *pos++ = WLAN_EID_HT_CAPABILITY;
1854         *pos++ = sizeof(struct ieee80211_ht_cap);
1855         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1856
1857         /* capability flags */
1858         tmp = cpu_to_le16(cap);
1859         memcpy(pos, &tmp, sizeof(u16));
1860         pos += sizeof(u16);
1861
1862         /* AMPDU parameters */
1863         *pos++ = ht_cap->ampdu_factor |
1864                  (ht_cap->ampdu_density <<
1865                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1866
1867         /* MCS set */
1868         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1869         pos += sizeof(ht_cap->mcs);
1870
1871         /* extended capabilities */
1872         pos += sizeof(__le16);
1873
1874         /* BF capabilities */
1875         pos += sizeof(__le32);
1876
1877         /* antenna selection */
1878         pos += sizeof(u8);
1879
1880         return pos;
1881 }
1882
1883 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1884                                u32 cap)
1885 {
1886         __le32 tmp;
1887
1888         *pos++ = WLAN_EID_VHT_CAPABILITY;
1889         *pos++ = sizeof(struct ieee80211_vht_cap);
1890         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1891
1892         /* capability flags */
1893         tmp = cpu_to_le32(cap);
1894         memcpy(pos, &tmp, sizeof(u32));
1895         pos += sizeof(u32);
1896
1897         /* VHT MCS set */
1898         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1899         pos += sizeof(vht_cap->vht_mcs);
1900
1901         return pos;
1902 }
1903
1904 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1905                                const struct cfg80211_chan_def *chandef,
1906                                u16 prot_mode)
1907 {
1908         struct ieee80211_ht_operation *ht_oper;
1909         /* Build HT Information */
1910         *pos++ = WLAN_EID_HT_OPERATION;
1911         *pos++ = sizeof(struct ieee80211_ht_operation);
1912         ht_oper = (struct ieee80211_ht_operation *)pos;
1913         ht_oper->primary_chan = ieee80211_frequency_to_channel(
1914                                         chandef->chan->center_freq);
1915         switch (chandef->width) {
1916         case NL80211_CHAN_WIDTH_160:
1917         case NL80211_CHAN_WIDTH_80P80:
1918         case NL80211_CHAN_WIDTH_80:
1919         case NL80211_CHAN_WIDTH_40:
1920                 if (chandef->center_freq1 > chandef->chan->center_freq)
1921                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1922                 else
1923                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1924                 break;
1925         default:
1926                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1927                 break;
1928         }
1929         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1930             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
1931             chandef->width != NL80211_CHAN_WIDTH_20)
1932                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1933
1934         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1935         ht_oper->stbc_param = 0x0000;
1936
1937         /* It seems that Basic MCS set and Supported MCS set
1938            are identical for the first 10 bytes */
1939         memset(&ht_oper->basic_set, 0, 16);
1940         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1941
1942         return pos + sizeof(struct ieee80211_ht_operation);
1943 }
1944
1945 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
1946                                   const struct ieee80211_ht_operation *ht_oper,
1947                                   struct cfg80211_chan_def *chandef)
1948 {
1949         enum nl80211_channel_type channel_type;
1950
1951         if (!ht_oper) {
1952                 cfg80211_chandef_create(chandef, control_chan,
1953                                         NL80211_CHAN_NO_HT);
1954                 return;
1955         }
1956
1957         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1958         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1959                 channel_type = NL80211_CHAN_HT20;
1960                 break;
1961         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1962                 channel_type = NL80211_CHAN_HT40PLUS;
1963                 break;
1964         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1965                 channel_type = NL80211_CHAN_HT40MINUS;
1966                 break;
1967         default:
1968                 channel_type = NL80211_CHAN_NO_HT;
1969         }
1970
1971         cfg80211_chandef_create(chandef, control_chan, channel_type);
1972 }
1973
1974 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1975                             struct sk_buff *skb, bool need_basic,
1976                             enum ieee80211_band band)
1977 {
1978         struct ieee80211_local *local = sdata->local;
1979         struct ieee80211_supported_band *sband;
1980         int rate;
1981         u8 i, rates, *pos;
1982         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1983
1984         sband = local->hw.wiphy->bands[band];
1985         rates = sband->n_bitrates;
1986         if (rates > 8)
1987                 rates = 8;
1988
1989         if (skb_tailroom(skb) < rates + 2)
1990                 return -ENOMEM;
1991
1992         pos = skb_put(skb, rates + 2);
1993         *pos++ = WLAN_EID_SUPP_RATES;
1994         *pos++ = rates;
1995         for (i = 0; i < rates; i++) {
1996                 u8 basic = 0;
1997                 if (need_basic && basic_rates & BIT(i))
1998                         basic = 0x80;
1999                 rate = sband->bitrates[i].bitrate;
2000                 *pos++ = basic | (u8) (rate / 5);
2001         }
2002
2003         return 0;
2004 }
2005
2006 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2007                                 struct sk_buff *skb, bool need_basic,
2008                                 enum ieee80211_band band)
2009 {
2010         struct ieee80211_local *local = sdata->local;
2011         struct ieee80211_supported_band *sband;
2012         int rate;
2013         u8 i, exrates, *pos;
2014         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2015
2016         sband = local->hw.wiphy->bands[band];
2017         exrates = sband->n_bitrates;
2018         if (exrates > 8)
2019                 exrates -= 8;
2020         else
2021                 exrates = 0;
2022
2023         if (skb_tailroom(skb) < exrates + 2)
2024                 return -ENOMEM;
2025
2026         if (exrates) {
2027                 pos = skb_put(skb, exrates + 2);
2028                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2029                 *pos++ = exrates;
2030                 for (i = 8; i < sband->n_bitrates; i++) {
2031                         u8 basic = 0;
2032                         if (need_basic && basic_rates & BIT(i))
2033                                 basic = 0x80;
2034                         rate = sband->bitrates[i].bitrate;
2035                         *pos++ = basic | (u8) (rate / 5);
2036                 }
2037         }
2038         return 0;
2039 }
2040
2041 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2042 {
2043         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2044         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2045
2046         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2047                 /* non-managed type inferfaces */
2048                 return 0;
2049         }
2050         return ifmgd->ave_beacon_signal;
2051 }
2052 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2053
2054 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2055 {
2056         if (!mcs)
2057                 return 1;
2058
2059         /* TODO: consider rx_highest */
2060
2061         if (mcs->rx_mask[3])
2062                 return 4;
2063         if (mcs->rx_mask[2])
2064                 return 3;
2065         if (mcs->rx_mask[1])
2066                 return 2;
2067         return 1;
2068 }
2069
2070 /**
2071  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2072  * @local: mac80211 hw info struct
2073  * @status: RX status
2074  * @mpdu_len: total MPDU length (including FCS)
2075  * @mpdu_offset: offset into MPDU to calculate timestamp at
2076  *
2077  * This function calculates the RX timestamp at the given MPDU offset, taking
2078  * into account what the RX timestamp was. An offset of 0 will just normalize
2079  * the timestamp to TSF at beginning of MPDU reception.
2080  */
2081 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2082                                      struct ieee80211_rx_status *status,
2083                                      unsigned int mpdu_len,
2084                                      unsigned int mpdu_offset)
2085 {
2086         u64 ts = status->mactime;
2087         struct rate_info ri;
2088         u16 rate;
2089
2090         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2091                 return 0;
2092
2093         memset(&ri, 0, sizeof(ri));
2094
2095         /* Fill cfg80211 rate info */
2096         if (status->flag & RX_FLAG_HT) {
2097                 ri.mcs = status->rate_idx;
2098                 ri.flags |= RATE_INFO_FLAGS_MCS;
2099                 if (status->flag & RX_FLAG_40MHZ)
2100                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2101                 if (status->flag & RX_FLAG_SHORT_GI)
2102                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2103         } else if (status->flag & RX_FLAG_VHT) {
2104                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2105                 ri.mcs = status->rate_idx;
2106                 ri.nss = status->vht_nss;
2107                 if (status->flag & RX_FLAG_40MHZ)
2108                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2109                 if (status->flag & RX_FLAG_80MHZ)
2110                         ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2111                 if (status->flag & RX_FLAG_80P80MHZ)
2112                         ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2113                 if (status->flag & RX_FLAG_160MHZ)
2114                         ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2115                 if (status->flag & RX_FLAG_SHORT_GI)
2116                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2117         } else {
2118                 struct ieee80211_supported_band *sband;
2119
2120                 sband = local->hw.wiphy->bands[status->band];
2121                 ri.legacy = sband->bitrates[status->rate_idx].bitrate;
2122         }
2123
2124         rate = cfg80211_calculate_bitrate(&ri);
2125
2126         /* rewind from end of MPDU */
2127         if (status->flag & RX_FLAG_MACTIME_END)
2128                 ts -= mpdu_len * 8 * 10 / rate;
2129
2130         ts += mpdu_offset * 8 * 10 / rate;
2131
2132         return ts;
2133 }
2134
2135 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2136 {
2137         struct ieee80211_sub_if_data *sdata;
2138
2139         mutex_lock(&local->iflist_mtx);
2140         list_for_each_entry(sdata, &local->interfaces, list) {
2141                 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
2142
2143                 if (sdata->wdev.cac_started) {
2144                         ieee80211_vif_release_channel(sdata);
2145                         cfg80211_cac_event(sdata->dev,
2146                                            NL80211_RADAR_CAC_ABORTED,
2147                                            GFP_KERNEL);
2148                 }
2149         }
2150         mutex_unlock(&local->iflist_mtx);
2151 }
2152
2153 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2154 {
2155         struct ieee80211_local *local =
2156                 container_of(work, struct ieee80211_local, radar_detected_work);
2157         struct cfg80211_chan_def chandef;
2158
2159         ieee80211_dfs_cac_cancel(local);
2160
2161         if (local->use_chanctx)
2162                 /* currently not handled */
2163                 WARN_ON(1);
2164         else {
2165                 cfg80211_chandef_create(&chandef, local->hw.conf.channel,
2166                                         local->hw.conf.channel_type);
2167                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2168         }
2169 }
2170
2171 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2172 {
2173         struct ieee80211_local *local = hw_to_local(hw);
2174
2175         trace_api_radar_detected(local);
2176
2177         ieee80211_queue_work(hw, &local->radar_detected_work);
2178 }
2179 EXPORT_SYMBOL(ieee80211_radar_detected);