net/mac80211/util.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * utilities for mac80211
  12  */
  13
  14 #include <net/mac80211.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/export.h>
  17 #include <linux/types.h>
  18 #include <linux/slab.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/crc32.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/rtnetlink.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wme.h"
  33 #include "led.h"
  34 #include "wep.h"
  35
  36 /* privid for wiphys to determine whether they belong to us or not */
  37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  38
  39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  40 {
  41         struct ieee80211_local *local;
  42         BUG_ON(!wiphy);
  43
  44         local = wiphy_priv(wiphy);
  45         return &local->hw;
  46 }
  47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  48
  49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  50                         enum nl80211_iftype type)
  51 {
  52         __le16 fc = hdr->frame_control;
  53
  54          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  55         if (len < 16)
  56                 return NULL;
  57
  58         if (ieee80211_is_data(fc)) {
  59                 if (len < 24) /* drop incorrect hdr len (data) */
  60                         return NULL;
  61
  62                 if (ieee80211_has_a4(fc))
  63                         return NULL;
  64                 if (ieee80211_has_tods(fc))
  65                         return hdr->addr1;
  66                 if (ieee80211_has_fromds(fc))
  67                         return hdr->addr2;
  68
  69                 return hdr->addr3;
  70         }
  71
  72         if (ieee80211_is_mgmt(fc)) {
  73                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  74                         return NULL;
  75                 return hdr->addr3;
  76         }
  77
  78         if (ieee80211_is_ctl(fc)) {
  79                 if(ieee80211_is_pspoll(fc))
  80                         return hdr->addr1;
  81
  82                 if (ieee80211_is_back_req(fc)) {
  83                         switch (type) {
  84                         case NL80211_IFTYPE_STATION:
  85                                 return hdr->addr2;
  86                         case NL80211_IFTYPE_AP:
  87                         case NL80211_IFTYPE_AP_VLAN:
  88                                 return hdr->addr1;
  89                         default:
  90                                 break; /* fall through to the return */
  91                         }
  92                 }
  93         }
  94
  95         return NULL;
  96 }
  97
  98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  99 {
 100         struct sk_buff *skb;
 101         struct ieee80211_hdr *hdr;
 102
 103         skb_queue_walk(&tx->skbs, skb) {
 104                 hdr = (struct ieee80211_hdr *) skb->data;
 105                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 106         }
 107 }
 108
 109 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
 110                              int rate, int erp, int short_preamble)
 111 {
 112         int dur;
 113
 114         /* calculate duration (in microseconds, rounded up to next higher
 115          * integer if it includes a fractional microsecond) to send frame of
 116          * len bytes (does not include FCS) at the given rate. Duration will
 117          * also include SIFS.
 118          *
 119          * rate is in 100 kbps, so divident is multiplied by 10 in the
 120          * DIV_ROUND_UP() operations.
 121          */
 122
 123         if (band == IEEE80211_BAND_5GHZ || erp) {
 124                 /*
 125                  * OFDM:
 126                  *
 127                  * N_DBPS = DATARATE x 4
 128                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 129                  *      (16 = SIGNAL time, 6 = tail bits)
 130                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 131                  *
 132                  * T_SYM = 4 usec
 133                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 134                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 135                  *      signal ext = 6 usec
 136                  */
 137                 dur = 16; /* SIFS + signal ext */
 138                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 139                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 140                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 141                                         4 * rate); /* T_SYM x N_SYM */
 142         } else {
 143                 /*
 144                  * 802.11b or 802.11g with 802.11b compatibility:
 145                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 146                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 147                  *
 148                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 149                  * aSIFSTime = 10 usec
 150                  * aPreambleLength = 144 usec or 72 usec with short preamble
 151                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 152                  */
 153                 dur = 10; /* aSIFSTime = 10 usec */
 154                 dur += short_preamble ? (72 + 24) : (144 + 48);
 155
 156                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 157         }
 158
 159         return dur;
 160 }
 161
 162 /* Exported duration function for driver use */
 163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 164                                         struct ieee80211_vif *vif,
 165                                         enum ieee80211_band band,
 166                                         size_t frame_len,
 167                                         struct ieee80211_rate *rate)
 168 {
 169         struct ieee80211_sub_if_data *sdata;
 170         u16 dur;
 171         int erp;
 172         bool short_preamble = false;
 173
 174         erp = 0;
 175         if (vif) {
 176                 sdata = vif_to_sdata(vif);
 177                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 178                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 179                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 180         }
 181
 182         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 183                                        short_preamble);
 184
 185         return cpu_to_le16(dur);
 186 }
 187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 188
 189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 190                               struct ieee80211_vif *vif, size_t frame_len,
 191                               const struct ieee80211_tx_info *frame_txctl)
 192 {
 193         struct ieee80211_local *local = hw_to_local(hw);
 194         struct ieee80211_rate *rate;
 195         struct ieee80211_sub_if_data *sdata;
 196         bool short_preamble;
 197         int erp;
 198         u16 dur;
 199         struct ieee80211_supported_band *sband;
 200
 201         sband = local->hw.wiphy->bands[frame_txctl->band];
 202
 203         short_preamble = false;
 204
 205         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 206
 207         erp = 0;
 208         if (vif) {
 209                 sdata = vif_to_sdata(vif);
 210                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 211                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 212                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 213         }
 214
 215         /* CTS duration */
 216         dur = ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 217                                        erp, short_preamble);
 218         /* Data frame duration */
 219         dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
 220                                         erp, short_preamble);
 221         /* ACK duration */
 222         dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 223                                         erp, short_preamble);
 224
 225         return cpu_to_le16(dur);
 226 }
 227 EXPORT_SYMBOL(ieee80211_rts_duration);
 228
 229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 230                                     struct ieee80211_vif *vif,
 231                                     size_t frame_len,
 232                                     const struct ieee80211_tx_info *frame_txctl)
 233 {
 234         struct ieee80211_local *local = hw_to_local(hw);
 235         struct ieee80211_rate *rate;
 236         struct ieee80211_sub_if_data *sdata;
 237         bool short_preamble;
 238         int erp;
 239         u16 dur;
 240         struct ieee80211_supported_band *sband;
 241
 242         sband = local->hw.wiphy->bands[frame_txctl->band];
 243
 244         short_preamble = false;
 245
 246         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 247         erp = 0;
 248         if (vif) {
 249                 sdata = vif_to_sdata(vif);
 250                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 251                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 252                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 253         }
 254
 255         /* Data frame duration */
 256         dur = ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
 257                                        erp, short_preamble);
 258         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 259                 /* ACK duration */
 260                 dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 261                                                 erp, short_preamble);
 262         }
 263
 264         return cpu_to_le16(dur);
 265 }
 266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 269 {
 270         struct ieee80211_sub_if_data *sdata;
 271         int n_acs = IEEE80211_NUM_ACS;
 272
 273         if (local->hw.queues < IEEE80211_NUM_ACS)
 274                 n_acs = 1;
 275
 276         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 277                 int ac;
 278
 279                 if (!sdata->dev)
 280                         continue;
 281
 282                 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 283                         continue;
 284
 285                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 286                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 287                         continue;
 288
 289                 for (ac = 0; ac < n_acs; ac++) {
 290                         int ac_queue = sdata->vif.hw_queue[ac];
 291
 292                         if (ac_queue == queue ||
 293                             (sdata->vif.cab_queue == queue &&
 294                              local->queue_stop_reasons[ac_queue] == 0 &&
 295                              skb_queue_empty(&local->pending[ac_queue])))
 296                                 netif_wake_subqueue(sdata->dev, ac);
 297                 }
 298         }
 299 }
 300
 301 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 302                                    enum queue_stop_reason reason)
 303 {
 304         struct ieee80211_local *local = hw_to_local(hw);
 305
 306         trace_wake_queue(local, queue, reason);
 307
 308         if (WARN_ON(queue >= hw->queues))
 309                 return;
 310
 311         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 312                 return;
 313
 314         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 315
 316         if (local->queue_stop_reasons[queue] != 0)
 317                 /* someone still has this queue stopped */
 318                 return;
 319
 320         if (skb_queue_empty(&local->pending[queue])) {
 321                 rcu_read_lock();
 322                 ieee80211_propagate_queue_wake(local, queue);
 323                 rcu_read_unlock();
 324         } else
 325                 tasklet_schedule(&local->tx_pending_tasklet);
 326 }
 327
 328 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 329                                     enum queue_stop_reason reason)
 330 {
 331         struct ieee80211_local *local = hw_to_local(hw);
 332         unsigned long flags;
 333
 334         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 335         __ieee80211_wake_queue(hw, queue, reason);
 336         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 337 }
 338
 339 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 340 {
 341         ieee80211_wake_queue_by_reason(hw, queue,
 342                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 343 }
 344 EXPORT_SYMBOL(ieee80211_wake_queue);
 345
 346 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 347                                    enum queue_stop_reason reason)
 348 {
 349         struct ieee80211_local *local = hw_to_local(hw);
 350         struct ieee80211_sub_if_data *sdata;
 351         int n_acs = IEEE80211_NUM_ACS;
 352
 353         trace_stop_queue(local, queue, reason);
 354
 355         if (WARN_ON(queue >= hw->queues))
 356                 return;
 357
 358         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 359                 return;
 360
 361         __set_bit(reason, &local->queue_stop_reasons[queue]);
 362
 363         if (local->hw.queues < IEEE80211_NUM_ACS)
 364                 n_acs = 1;
 365
 366         rcu_read_lock();
 367         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 368                 int ac;
 369
 370                 if (!sdata->dev)
 371                         continue;
 372
 373                 for (ac = 0; ac < n_acs; ac++) {
 374                         if (sdata->vif.hw_queue[ac] == queue ||
 375                             sdata->vif.cab_queue == queue)
 376                                 netif_stop_subqueue(sdata->dev, ac);
 377                 }
 378         }
 379         rcu_read_unlock();
 380 }
 381
 382 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 383                                     enum queue_stop_reason reason)
 384 {
 385         struct ieee80211_local *local = hw_to_local(hw);
 386         unsigned long flags;
 387
 388         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 389         __ieee80211_stop_queue(hw, queue, reason);
 390         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 391 }
 392
 393 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 394 {
 395         ieee80211_stop_queue_by_reason(hw, queue,
 396                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 397 }
 398 EXPORT_SYMBOL(ieee80211_stop_queue);
 399
 400 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 401                                struct sk_buff *skb)
 402 {
 403         struct ieee80211_hw *hw = &local->hw;
 404         unsigned long flags;
 405         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 406         int queue = info->hw_queue;
 407
 408         if (WARN_ON(!info->control.vif)) {
 409                 ieee80211_free_txskb(&local->hw, skb);
 410                 return;
 411         }
 412
 413         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 414         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 415         __skb_queue_tail(&local->pending[queue], skb);
 416         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 417         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 418 }
 419
 420 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 421                                    struct sk_buff_head *skbs,
 422                                    void (*fn)(void *data), void *data)
 423 {
 424         struct ieee80211_hw *hw = &local->hw;
 425         struct sk_buff *skb;
 426         unsigned long flags;
 427         int queue, i;
 428
 429         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 430         while ((skb = skb_dequeue(skbs))) {
 431                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 432
 433                 if (WARN_ON(!info->control.vif)) {
 434                         ieee80211_free_txskb(&local->hw, skb);
 435                         continue;
 436                 }
 437
 438                 queue = info->hw_queue;
 439
 440                 __ieee80211_stop_queue(hw, queue,
 441                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 442
 443                 __skb_queue_tail(&local->pending[queue], skb);
 444         }
 445
 446         if (fn)
 447                 fn(data);
 448
 449         for (i = 0; i < hw->queues; i++)
 450                 __ieee80211_wake_queue(hw, i,
 451                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 452         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 453 }
 454
 455 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 456                                      unsigned long queues,
 457                                      enum queue_stop_reason reason)
 458 {
 459         struct ieee80211_local *local = hw_to_local(hw);
 460         unsigned long flags;
 461         int i;
 462
 463         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 464
 465         for_each_set_bit(i, &queues, hw->queues)
 466                 __ieee80211_stop_queue(hw, i, reason);
 467
 468         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 469 }
 470
 471 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 472 {
 473         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 474                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 475 }
 476 EXPORT_SYMBOL(ieee80211_stop_queues);
 477
 478 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 479 {
 480         struct ieee80211_local *local = hw_to_local(hw);
 481         unsigned long flags;
 482         int ret;
 483
 484         if (WARN_ON(queue >= hw->queues))
 485                 return true;
 486
 487         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 488         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 489                        &local->queue_stop_reasons[queue]);
 490         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 491         return ret;
 492 }
 493 EXPORT_SYMBOL(ieee80211_queue_stopped);
 494
 495 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 496                                      unsigned long queues,
 497                                      enum queue_stop_reason reason)
 498 {
 499         struct ieee80211_local *local = hw_to_local(hw);
 500         unsigned long flags;
 501         int i;
 502
 503         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 504
 505         for_each_set_bit(i, &queues, hw->queues)
 506                 __ieee80211_wake_queue(hw, i, reason);
 507
 508         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 509 }
 510
 511 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 512 {
 513         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 514                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 515 }
 516 EXPORT_SYMBOL(ieee80211_wake_queues);
 517
 518 void ieee80211_flush_queues(struct ieee80211_local *local,
 519                             struct ieee80211_sub_if_data *sdata)
 520 {
 521         u32 queues;
 522
 523         if (!local->ops->flush)
 524                 return;
 525
 526         if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
 527                 int ac;
 528
 529                 queues = 0;
 530
 531                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 532                         queues |= BIT(sdata->vif.hw_queue[ac]);
 533                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 534                         queues |= BIT(sdata->vif.cab_queue);
 535         } else {
 536                 /* all queues */
 537                 queues = BIT(local->hw.queues) - 1;
 538         }
 539
 540         ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 541                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 542
 543         drv_flush(local, queues, false);
 544
 545         ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 546                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 547 }
 548
 549 void ieee80211_iterate_active_interfaces(
 550         struct ieee80211_hw *hw, u32 iter_flags,
 551         void (*iterator)(void *data, u8 *mac,
 552                          struct ieee80211_vif *vif),
 553         void *data)
 554 {
 555         struct ieee80211_local *local = hw_to_local(hw);
 556         struct ieee80211_sub_if_data *sdata;
 557
 558         mutex_lock(&local->iflist_mtx);
 559
 560         list_for_each_entry(sdata, &local->interfaces, list) {
 561                 switch (sdata->vif.type) {
 562                 case NL80211_IFTYPE_MONITOR:
 563                 case NL80211_IFTYPE_AP_VLAN:
 564                         continue;
 565                 default:
 566                         break;
 567                 }
 568                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 569                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 570                         continue;
 571                 if (ieee80211_sdata_running(sdata))
 572                         iterator(data, sdata->vif.addr,
 573                                  &sdata->vif);
 574         }
 575
 576         sdata = rcu_dereference_protected(local->monitor_sdata,
 577                                           lockdep_is_held(&local->iflist_mtx));
 578         if (sdata &&
 579             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 580              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 581                 iterator(data, sdata->vif.addr, &sdata->vif);
 582
 583         mutex_unlock(&local->iflist_mtx);
 584 }
 585 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 586
 587 void ieee80211_iterate_active_interfaces_atomic(
 588         struct ieee80211_hw *hw, u32 iter_flags,
 589         void (*iterator)(void *data, u8 *mac,
 590                          struct ieee80211_vif *vif),
 591         void *data)
 592 {
 593         struct ieee80211_local *local = hw_to_local(hw);
 594         struct ieee80211_sub_if_data *sdata;
 595
 596         rcu_read_lock();
 597
 598         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 599                 switch (sdata->vif.type) {
 600                 case NL80211_IFTYPE_MONITOR:
 601                 case NL80211_IFTYPE_AP_VLAN:
 602                         continue;
 603                 default:
 604                         break;
 605                 }
 606                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 607                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 608                         continue;
 609                 if (ieee80211_sdata_running(sdata))
 610                         iterator(data, sdata->vif.addr,
 611                                  &sdata->vif);
 612         }
 613
 614         sdata = rcu_dereference(local->monitor_sdata);
 615         if (sdata &&
 616             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 617              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 618                 iterator(data, sdata->vif.addr, &sdata->vif);
 619
 620         rcu_read_unlock();
 621 }
 622 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 623
 624 /*
 625  * Nothing should have been stuffed into the workqueue during
 626  * the suspend->resume cycle. If this WARN is seen then there
 627  * is a bug with either the driver suspend or something in
 628  * mac80211 stuffing into the workqueue which we haven't yet
 629  * cleared during mac80211's suspend cycle.
 630  */
 631 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 632 {
 633         if (WARN(local->suspended && !local->resuming,
 634                  "queueing ieee80211 work while going to suspend\n"))
 635                 return false;
 636
 637         return true;
 638 }
 639
 640 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 641 {
 642         struct ieee80211_local *local = hw_to_local(hw);
 643
 644         if (!ieee80211_can_queue_work(local))
 645                 return;
 646
 647         queue_work(local->workqueue, work);
 648 }
 649 EXPORT_SYMBOL(ieee80211_queue_work);
 650
 651 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 652                                   struct delayed_work *dwork,
 653                                   unsigned long delay)
 654 {
 655         struct ieee80211_local *local = hw_to_local(hw);
 656
 657         if (!ieee80211_can_queue_work(local))
 658                 return;
 659
 660         queue_delayed_work(local->workqueue, dwork, delay);
 661 }
 662 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 663
 664 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 665                                struct ieee802_11_elems *elems,
 666                                u64 filter, u32 crc)
 667 {
 668         size_t left = len;
 669         const u8 *pos = start;
 670         bool calc_crc = filter != 0;
 671         DECLARE_BITMAP(seen_elems, 256);
 672         const u8 *ie;
 673
 674         bitmap_zero(seen_elems, 256);
 675         memset(elems, 0, sizeof(*elems));
 676         elems->ie_start = start;
 677         elems->total_len = len;
 678
 679         while (left >= 2) {
 680                 u8 id, elen;
 681                 bool elem_parse_failed;
 682
 683                 id = *pos++;
 684                 elen = *pos++;
 685                 left -= 2;
 686
 687                 if (elen > left) {
 688                         elems->parse_error = true;
 689                         break;
 690                 }
 691
 692                 switch (id) {
 693                 case WLAN_EID_SSID:
 694                 case WLAN_EID_SUPP_RATES:
 695                 case WLAN_EID_FH_PARAMS:
 696                 case WLAN_EID_DS_PARAMS:
 697                 case WLAN_EID_CF_PARAMS:
 698                 case WLAN_EID_TIM:
 699                 case WLAN_EID_IBSS_PARAMS:
 700                 case WLAN_EID_CHALLENGE:
 701                 case WLAN_EID_RSN:
 702                 case WLAN_EID_ERP_INFO:
 703                 case WLAN_EID_EXT_SUPP_RATES:
 704                 case WLAN_EID_HT_CAPABILITY:
 705                 case WLAN_EID_HT_OPERATION:
 706                 case WLAN_EID_VHT_CAPABILITY:
 707                 case WLAN_EID_VHT_OPERATION:
 708                 case WLAN_EID_MESH_ID:
 709                 case WLAN_EID_MESH_CONFIG:
 710                 case WLAN_EID_PEER_MGMT:
 711                 case WLAN_EID_PREQ:
 712                 case WLAN_EID_PREP:
 713                 case WLAN_EID_PERR:
 714                 case WLAN_EID_RANN:
 715                 case WLAN_EID_CHANNEL_SWITCH:
 716                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 717                 case WLAN_EID_COUNTRY:
 718                 case WLAN_EID_PWR_CONSTRAINT:
 719                 case WLAN_EID_TIMEOUT_INTERVAL:
 720                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 721                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 722                 /*
 723                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 724                  * that if the content gets bigger it might be needed more than once
 725                  */
 726                         if (test_bit(id, seen_elems)) {
 727                                 elems->parse_error = true;
 728                                 left -= elen;
 729                                 pos += elen;
 730                                 continue;
 731                         }
 732                         break;
 733                 }
 734
 735                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 736                         crc = crc32_be(crc, pos - 2, elen + 2);
 737
 738                 elem_parse_failed = false;
 739
 740                 switch (id) {
 741                 case WLAN_EID_SSID:
 742                         elems->ssid = pos;
 743                         elems->ssid_len = elen;
 744                         break;
 745                 case WLAN_EID_SUPP_RATES:
 746                         elems->supp_rates = pos;
 747                         elems->supp_rates_len = elen;
 748                         break;
 749                 case WLAN_EID_DS_PARAMS:
 750                         if (elen >= 1)
 751                                 elems->ds_params = pos;
 752                         else
 753                                 elem_parse_failed = true;
 754                         break;
 755                 case WLAN_EID_TIM:
 756                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 757                                 elems->tim = (void *)pos;
 758                                 elems->tim_len = elen;
 759                         } else
 760                                 elem_parse_failed = true;
 761                         break;
 762                 case WLAN_EID_CHALLENGE:
 763                         elems->challenge = pos;
 764                         elems->challenge_len = elen;
 765                         break;
 766                 case WLAN_EID_VENDOR_SPECIFIC:
 767                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 768                             pos[2] == 0xf2) {
 769                                 /* Microsoft OUI (00:50:F2) */
 770
 771                                 if (calc_crc)
 772                                         crc = crc32_be(crc, pos - 2, elen + 2);
 773
 774                                 if (elen >= 5 && pos[3] == 2) {
 775                                         /* OUI Type 2 - WMM IE */
 776                                         if (pos[4] == 0) {
 777                                                 elems->wmm_info = pos;
 778                                                 elems->wmm_info_len = elen;
 779                                         } else if (pos[4] == 1) {
 780                                                 elems->wmm_param = pos;
 781                                                 elems->wmm_param_len = elen;
 782                                         }
 783                                 }
 784                         }
 785                         break;
 786                 case WLAN_EID_RSN:
 787                         elems->rsn = pos;
 788                         elems->rsn_len = elen;
 789                         break;
 790                 case WLAN_EID_ERP_INFO:
 791                         if (elen >= 1)
 792                                 elems->erp_info = pos;
 793                         else
 794                                 elem_parse_failed = true;
 795                         break;
 796                 case WLAN_EID_EXT_SUPP_RATES:
 797                         elems->ext_supp_rates = pos;
 798                         elems->ext_supp_rates_len = elen;
 799                         break;
 800                 case WLAN_EID_HT_CAPABILITY:
 801                         if (elen >= sizeof(struct ieee80211_ht_cap))
 802                                 elems->ht_cap_elem = (void *)pos;
 803                         else
 804                                 elem_parse_failed = true;
 805                         break;
 806                 case WLAN_EID_HT_OPERATION:
 807                         if (elen >= sizeof(struct ieee80211_ht_operation))
 808                                 elems->ht_operation = (void *)pos;
 809                         else
 810                                 elem_parse_failed = true;
 811                         break;
 812                 case WLAN_EID_VHT_CAPABILITY:
 813                         if (elen >= sizeof(struct ieee80211_vht_cap))
 814                                 elems->vht_cap_elem = (void *)pos;
 815                         else
 816                                 elem_parse_failed = true;
 817                         break;
 818                 case WLAN_EID_VHT_OPERATION:
 819                         if (elen >= sizeof(struct ieee80211_vht_operation))
 820                                 elems->vht_operation = (void *)pos;
 821                         else
 822                                 elem_parse_failed = true;
 823                         break;
 824                 case WLAN_EID_OPMODE_NOTIF:
 825                         if (elen > 0)
 826                                 elems->opmode_notif = pos;
 827                         else
 828                                 elem_parse_failed = true;
 829                         break;
 830                 case WLAN_EID_MESH_ID:
 831                         elems->mesh_id = pos;
 832                         elems->mesh_id_len = elen;
 833                         break;
 834                 case WLAN_EID_MESH_CONFIG:
 835                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 836                                 elems->mesh_config = (void *)pos;
 837                         else
 838                                 elem_parse_failed = true;
 839                         break;
 840                 case WLAN_EID_PEER_MGMT:
 841                         elems->peering = pos;
 842                         elems->peering_len = elen;
 843                         break;
 844                 case WLAN_EID_MESH_AWAKE_WINDOW:
 845                         if (elen >= 2)
 846                                 elems->awake_window = (void *)pos;
 847                         break;
 848                 case WLAN_EID_PREQ:
 849                         elems->preq = pos;
 850                         elems->preq_len = elen;
 851                         break;
 852                 case WLAN_EID_PREP:
 853                         elems->prep = pos;
 854                         elems->prep_len = elen;
 855                         break;
 856                 case WLAN_EID_PERR:
 857                         elems->perr = pos;
 858                         elems->perr_len = elen;
 859                         break;
 860                 case WLAN_EID_RANN:
 861                         if (elen >= sizeof(struct ieee80211_rann_ie))
 862                                 elems->rann = (void *)pos;
 863                         else
 864                                 elem_parse_failed = true;
 865                         break;
 866                 case WLAN_EID_CHANNEL_SWITCH:
 867                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 868                                 elem_parse_failed = true;
 869                                 break;
 870                         }
 871                         elems->ch_switch_ie = (void *)pos;
 872                         break;
 873                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 874                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
 875                                 elem_parse_failed = true;
 876                                 break;
 877                         }
 878                         elems->ext_chansw_ie = (void *)pos;
 879                         break;
 880                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 881                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
 882                                 elem_parse_failed = true;
 883                                 break;
 884                         }
 885                         elems->sec_chan_offs = (void *)pos;
 886                         break;
 887                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 888                         if (!action ||
 889                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
 890                                 elem_parse_failed = true;
 891                                 break;
 892                         }
 893                         elems->wide_bw_chansw_ie = (void *)pos;
 894                         break;
 895                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
 896                         if (action) {
 897                                 elem_parse_failed = true;
 898                                 break;
 899                         }
 900                         /*
 901                          * This is a bit tricky, but as we only care about
 902                          * the wide bandwidth channel switch element, so
 903                          * just parse it out manually.
 904                          */
 905                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
 906                                               pos, elen);
 907                         if (ie) {
 908                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
 909                                         elems->wide_bw_chansw_ie =
 910                                                 (void *)(ie + 2);
 911                                 else
 912                                         elem_parse_failed = true;
 913                         }
 914                         break;
 915                 case WLAN_EID_COUNTRY:
 916                         elems->country_elem = pos;
 917                         elems->country_elem_len = elen;
 918                         break;
 919                 case WLAN_EID_PWR_CONSTRAINT:
 920                         if (elen != 1) {
 921                                 elem_parse_failed = true;
 922                                 break;
 923                         }
 924                         elems->pwr_constr_elem = pos;
 925                         break;
 926                 case WLAN_EID_TIMEOUT_INTERVAL:
 927                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
 928                                 elems->timeout_int = (void *)pos;
 929                         else
 930                                 elem_parse_failed = true;
 931                         break;
 932                 default:
 933                         break;
 934                 }
 935
 936                 if (elem_parse_failed)
 937                         elems->parse_error = true;
 938                 else
 939                         __set_bit(id, seen_elems);
 940
 941                 left -= elen;
 942                 pos += elen;
 943         }
 944
 945         if (left != 0)
 946                 elems->parse_error = true;
 947
 948         return crc;
 949 }
 950
 951 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 952                                bool bss_notify)
 953 {
 954         struct ieee80211_local *local = sdata->local;
 955         struct ieee80211_tx_queue_params qparam;
 956         struct ieee80211_chanctx_conf *chanctx_conf;
 957         int ac;
 958         bool use_11b, enable_qos;
 959         int aCWmin, aCWmax;
 960
 961         if (!local->ops->conf_tx)
 962                 return;
 963
 964         if (local->hw.queues < IEEE80211_NUM_ACS)
 965                 return;
 966
 967         memset(&qparam, 0, sizeof(qparam));
 968
 969         rcu_read_lock();
 970         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 971         use_11b = (chanctx_conf &&
 972                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
 973                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 974         rcu_read_unlock();
 975
 976         /*
 977          * By default disable QoS in STA mode for old access points, which do
 978          * not support 802.11e. New APs will provide proper queue parameters,
 979          * that we will configure later.
 980          */
 981         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 982
 983         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 984                 /* Set defaults according to 802.11-2007 Table 7-37 */
 985                 aCWmax = 1023;
 986                 if (use_11b)
 987                         aCWmin = 31;
 988                 else
 989                         aCWmin = 15;
 990
 991                 if (enable_qos) {
 992                         switch (ac) {
 993                         case IEEE80211_AC_BK:
 994                                 qparam.cw_max = aCWmax;
 995                                 qparam.cw_min = aCWmin;
 996                                 qparam.txop = 0;
 997                                 qparam.aifs = 7;
 998                                 break;
 999                         /* never happens but let's not leave undefined */
1000                         default:
1001                         case IEEE80211_AC_BE:
1002                                 qparam.cw_max = aCWmax;
1003                                 qparam.cw_min = aCWmin;
1004                                 qparam.txop = 0;
1005                                 qparam.aifs = 3;
1006                                 break;
1007                         case IEEE80211_AC_VI:
1008                                 qparam.cw_max = aCWmin;
1009                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1010                                 if (use_11b)
1011                                         qparam.txop = 6016/32;
1012                                 else
1013                                         qparam.txop = 3008/32;
1014                                 qparam.aifs = 2;
1015                                 break;
1016                         case IEEE80211_AC_VO:
1017                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1018                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1019                                 if (use_11b)
1020                                         qparam.txop = 3264/32;
1021                                 else
1022                                         qparam.txop = 1504/32;
1023                                 qparam.aifs = 2;
1024                                 break;
1025                         }
1026                 } else {
1027                         /* Confiure old 802.11b/g medium access rules. */
1028                         qparam.cw_max = aCWmax;
1029                         qparam.cw_min = aCWmin;
1030                         qparam.txop = 0;
1031                         qparam.aifs = 2;
1032                 }
1033
1034                 qparam.uapsd = false;
1035
1036                 sdata->tx_conf[ac] = qparam;
1037                 drv_conf_tx(local, sdata, ac, &qparam);
1038         }
1039
1040         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1041             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1042                 sdata->vif.bss_conf.qos = enable_qos;
1043                 if (bss_notify)
1044                         ieee80211_bss_info_change_notify(sdata,
1045                                                          BSS_CHANGED_QOS);
1046         }
1047 }
1048
1049 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
1050                                   const size_t supp_rates_len,
1051                                   const u8 *supp_rates)
1052 {
1053         struct ieee80211_chanctx_conf *chanctx_conf;
1054         int i, have_higher_than_11mbit = 0;
1055
1056         /* cf. IEEE 802.11 9.2.12 */
1057         for (i = 0; i < supp_rates_len; i++)
1058                 if ((supp_rates[i] & 0x7f) * 5 > 110)
1059                         have_higher_than_11mbit = 1;
1060
1061         rcu_read_lock();
1062         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1063
1064         if (chanctx_conf &&
1065             chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ &&
1066             have_higher_than_11mbit)
1067                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1068         else
1069                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1070         rcu_read_unlock();
1071
1072         ieee80211_set_wmm_default(sdata, true);
1073 }
1074
1075 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
1076                               enum ieee80211_band band)
1077 {
1078         struct ieee80211_supported_band *sband;
1079         struct ieee80211_rate *bitrates;
1080         u32 mandatory_rates;
1081         enum ieee80211_rate_flags mandatory_flag;
1082         int i;
1083
1084         sband = local->hw.wiphy->bands[band];
1085         if (WARN_ON(!sband))
1086                 return 1;
1087
1088         if (band == IEEE80211_BAND_2GHZ)
1089                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
1090         else
1091                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
1092
1093         bitrates = sband->bitrates;
1094         mandatory_rates = 0;
1095         for (i = 0; i < sband->n_bitrates; i++)
1096                 if (bitrates[i].flags & mandatory_flag)
1097                         mandatory_rates |= BIT(i);
1098         return mandatory_rates;
1099 }
1100
1101 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1102                          u16 transaction, u16 auth_alg, u16 status,
1103                          const u8 *extra, size_t extra_len, const u8 *da,
1104                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1105                          u32 tx_flags)
1106 {
1107         struct ieee80211_local *local = sdata->local;
1108         struct sk_buff *skb;
1109         struct ieee80211_mgmt *mgmt;
1110         int err;
1111
1112         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1113                             sizeof(*mgmt) + 6 + extra_len);
1114         if (!skb)
1115                 return;
1116
1117         skb_reserve(skb, local->hw.extra_tx_headroom);
1118
1119         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1120         memset(mgmt, 0, 24 + 6);
1121         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1122                                           IEEE80211_STYPE_AUTH);
1123         memcpy(mgmt->da, da, ETH_ALEN);
1124         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1125         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1126         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1127         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1128         mgmt->u.auth.status_code = cpu_to_le16(status);
1129         if (extra)
1130                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1131
1132         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1133                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1134                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1135                 WARN_ON(err);
1136         }
1137
1138         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1139                                         tx_flags;
1140         ieee80211_tx_skb(sdata, skb);
1141 }
1142
1143 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1144                                     const u8 *bssid, u16 stype, u16 reason,
1145                                     bool send_frame, u8 *frame_buf)
1146 {
1147         struct ieee80211_local *local = sdata->local;
1148         struct sk_buff *skb;
1149         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1150
1151         /* build frame */
1152         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1153         mgmt->duration = 0; /* initialize only */
1154         mgmt->seq_ctrl = 0; /* initialize only */
1155         memcpy(mgmt->da, bssid, ETH_ALEN);
1156         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1157         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1158         /* u.deauth.reason_code == u.disassoc.reason_code */
1159         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1160
1161         if (send_frame) {
1162                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1163                                     IEEE80211_DEAUTH_FRAME_LEN);
1164                 if (!skb)
1165                         return;
1166
1167                 skb_reserve(skb, local->hw.extra_tx_headroom);
1168
1169                 /* copy in frame */
1170                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1171                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1172
1173                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1174                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1175                         IEEE80211_SKB_CB(skb)->flags |=
1176                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1177
1178                 ieee80211_tx_skb(sdata, skb);
1179         }
1180 }
1181
1182 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1183                              size_t buffer_len, const u8 *ie, size_t ie_len,
1184                              enum ieee80211_band band, u32 rate_mask,
1185                              u8 channel)
1186 {
1187         struct ieee80211_supported_band *sband;
1188         u8 *pos = buffer, *end = buffer + buffer_len;
1189         size_t offset = 0, noffset;
1190         int supp_rates_len, i;
1191         u8 rates[32];
1192         int num_rates;
1193         int ext_rates_len;
1194
1195         sband = local->hw.wiphy->bands[band];
1196         if (WARN_ON_ONCE(!sband))
1197                 return 0;
1198
1199         num_rates = 0;
1200         for (i = 0; i < sband->n_bitrates; i++) {
1201                 if ((BIT(i) & rate_mask) == 0)
1202                         continue; /* skip rate */
1203                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1204         }
1205
1206         supp_rates_len = min_t(int, num_rates, 8);
1207
1208         if (end - pos < 2 + supp_rates_len)
1209                 goto out_err;
1210         *pos++ = WLAN_EID_SUPP_RATES;
1211         *pos++ = supp_rates_len;
1212         memcpy(pos, rates, supp_rates_len);
1213         pos += supp_rates_len;
1214
1215         /* insert "request information" if in custom IEs */
1216         if (ie && ie_len) {
1217                 static const u8 before_extrates[] = {
1218                         WLAN_EID_SSID,
1219                         WLAN_EID_SUPP_RATES,
1220                         WLAN_EID_REQUEST,
1221                 };
1222                 noffset = ieee80211_ie_split(ie, ie_len,
1223                                              before_extrates,
1224                                              ARRAY_SIZE(before_extrates),
1225                                              offset);
1226                 if (end - pos < noffset - offset)
1227                         goto out_err;
1228                 memcpy(pos, ie + offset, noffset - offset);
1229                 pos += noffset - offset;
1230                 offset = noffset;
1231         }
1232
1233         ext_rates_len = num_rates - supp_rates_len;
1234         if (ext_rates_len > 0) {
1235                 if (end - pos < 2 + ext_rates_len)
1236                         goto out_err;
1237                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1238                 *pos++ = ext_rates_len;
1239                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1240                 pos += ext_rates_len;
1241         }
1242
1243         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1244                 if (end - pos < 3)
1245                         goto out_err;
1246                 *pos++ = WLAN_EID_DS_PARAMS;
1247                 *pos++ = 1;
1248                 *pos++ = channel;
1249         }
1250
1251         /* insert custom IEs that go before HT */
1252         if (ie && ie_len) {
1253                 static const u8 before_ht[] = {
1254                         WLAN_EID_SSID,
1255                         WLAN_EID_SUPP_RATES,
1256                         WLAN_EID_REQUEST,
1257                         WLAN_EID_EXT_SUPP_RATES,
1258                         WLAN_EID_DS_PARAMS,
1259                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1260                 };
1261                 noffset = ieee80211_ie_split(ie, ie_len,
1262                                              before_ht, ARRAY_SIZE(before_ht),
1263                                              offset);
1264                 if (end - pos < noffset - offset)
1265                         goto out_err;
1266                 memcpy(pos, ie + offset, noffset - offset);
1267                 pos += noffset - offset;
1268                 offset = noffset;
1269         }
1270
1271         if (sband->ht_cap.ht_supported) {
1272                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1273                         goto out_err;
1274                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1275                                                 sband->ht_cap.cap);
1276         }
1277
1278         /*
1279          * If adding more here, adjust code in main.c
1280          * that calculates local->scan_ies_len.
1281          */
1282
1283         /* add any remaining custom IEs */
1284         if (ie && ie_len) {
1285                 noffset = ie_len;
1286                 if (end - pos < noffset - offset)
1287                         goto out_err;
1288                 memcpy(pos, ie + offset, noffset - offset);
1289                 pos += noffset - offset;
1290         }
1291
1292         if (sband->vht_cap.vht_supported) {
1293                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1294                         goto out_err;
1295                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1296                                                  sband->vht_cap.cap);
1297         }
1298
1299         return pos - buffer;
1300  out_err:
1301         WARN_ONCE(1, "not enough space for preq IEs\n");
1302         return pos - buffer;
1303 }
1304
1305 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1306                                           u8 *dst, u32 ratemask,
1307                                           struct ieee80211_channel *chan,
1308                                           const u8 *ssid, size_t ssid_len,
1309                                           const u8 *ie, size_t ie_len,
1310                                           bool directed)
1311 {
1312         struct ieee80211_local *local = sdata->local;
1313         struct sk_buff *skb;
1314         struct ieee80211_mgmt *mgmt;
1315         u8 chan_no;
1316         int ies_len;
1317
1318         /*
1319          * Do not send DS Channel parameter for directed probe requests
1320          * in order to maximize the chance that we get a response.  Some
1321          * badly-behaved APs don't respond when this parameter is included.
1322          */
1323         if (directed)
1324                 chan_no = 0;
1325         else
1326                 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1327
1328         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1329                                      ssid, ssid_len, 100 + ie_len);
1330         if (!skb)
1331                 return NULL;
1332
1333         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1334                                            skb_tailroom(skb),
1335                                            ie, ie_len, chan->band,
1336                                            ratemask, chan_no);
1337         skb_put(skb, ies_len);
1338
1339         if (dst) {
1340                 mgmt = (struct ieee80211_mgmt *) skb->data;
1341                 memcpy(mgmt->da, dst, ETH_ALEN);
1342                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1343         }
1344
1345         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1346
1347         return skb;
1348 }
1349
1350 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1351                               const u8 *ssid, size_t ssid_len,
1352                               const u8 *ie, size_t ie_len,
1353                               u32 ratemask, bool directed, u32 tx_flags,
1354                               struct ieee80211_channel *channel, bool scan)
1355 {
1356         struct sk_buff *skb;
1357
1358         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1359                                         ssid, ssid_len,
1360                                         ie, ie_len, directed);
1361         if (skb) {
1362                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1363                 if (scan)
1364                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1365                 else
1366                         ieee80211_tx_skb(sdata, skb);
1367         }
1368 }
1369
1370 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1371                             struct ieee802_11_elems *elems,
1372                             enum ieee80211_band band, u32 *basic_rates)
1373 {
1374         struct ieee80211_supported_band *sband;
1375         struct ieee80211_rate *bitrates;
1376         size_t num_rates;
1377         u32 supp_rates;
1378         int i, j;
1379         sband = local->hw.wiphy->bands[band];
1380
1381         if (WARN_ON(!sband))
1382                 return 1;
1383
1384         bitrates = sband->bitrates;
1385         num_rates = sband->n_bitrates;
1386         supp_rates = 0;
1387         for (i = 0; i < elems->supp_rates_len +
1388                      elems->ext_supp_rates_len; i++) {
1389                 u8 rate = 0;
1390                 int own_rate;
1391                 bool is_basic;
1392                 if (i < elems->supp_rates_len)
1393                         rate = elems->supp_rates[i];
1394                 else if (elems->ext_supp_rates)
1395                         rate = elems->ext_supp_rates
1396                                 [i - elems->supp_rates_len];
1397                 own_rate = 5 * (rate & 0x7f);
1398                 is_basic = !!(rate & 0x80);
1399
1400                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1401                         continue;
1402
1403                 for (j = 0; j < num_rates; j++) {
1404                         if (bitrates[j].bitrate == own_rate) {
1405                                 supp_rates |= BIT(j);
1406                                 if (basic_rates && is_basic)
1407                                         *basic_rates |= BIT(j);
1408                         }
1409                 }
1410         }
1411         return supp_rates;
1412 }
1413
1414 void ieee80211_stop_device(struct ieee80211_local *local)
1415 {
1416         ieee80211_led_radio(local, false);
1417         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1418
1419         cancel_work_sync(&local->reconfig_filter);
1420
1421         flush_workqueue(local->workqueue);
1422         drv_stop(local);
1423 }
1424
1425 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1426                                      struct ieee80211_sub_if_data *sdata)
1427 {
1428         struct ieee80211_chanctx_conf *conf;
1429         struct ieee80211_chanctx *ctx;
1430
1431         if (!local->use_chanctx)
1432                 return;
1433
1434         mutex_lock(&local->chanctx_mtx);
1435         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1436                                          lockdep_is_held(&local->chanctx_mtx));
1437         if (conf) {
1438                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1439                 drv_assign_vif_chanctx(local, sdata, ctx);
1440         }
1441         mutex_unlock(&local->chanctx_mtx);
1442 }
1443
1444 int ieee80211_reconfig(struct ieee80211_local *local)
1445 {
1446         struct ieee80211_hw *hw = &local->hw;
1447         struct ieee80211_sub_if_data *sdata;
1448         struct ieee80211_chanctx *ctx;
1449         struct sta_info *sta;
1450         int res, i;
1451         bool reconfig_due_to_wowlan = false;
1452
1453 #ifdef CONFIG_PM
1454         if (local->suspended)
1455                 local->resuming = true;
1456
1457         if (local->wowlan) {
1458                 local->wowlan = false;
1459                 res = drv_resume(local);
1460                 if (res < 0) {
1461                         local->resuming = false;
1462                         return res;
1463                 }
1464                 if (res == 0)
1465                         goto wake_up;
1466                 WARN_ON(res > 1);
1467                 /*
1468                  * res is 1, which means the driver requested
1469                  * to go through a regular reset on wakeup.
1470                  */
1471                 reconfig_due_to_wowlan = true;
1472         }
1473 #endif
1474         /* everything else happens only if HW was up & running */
1475         if (!local->open_count)
1476                 goto wake_up;
1477
1478         /*
1479          * Upon resume hardware can sometimes be goofy due to
1480          * various platform / driver / bus issues, so restarting
1481          * the device may at times not work immediately. Propagate
1482          * the error.
1483          */
1484         res = drv_start(local);
1485         if (res) {
1486                 WARN(local->suspended, "Hardware became unavailable "
1487                      "upon resume. This could be a software issue "
1488                      "prior to suspend or a hardware issue.\n");
1489                 return res;
1490         }
1491
1492         /* setup fragmentation threshold */
1493         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1494
1495         /* setup RTS threshold */
1496         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1497
1498         /* reset coverage class */
1499         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1500
1501         ieee80211_led_radio(local, true);
1502         ieee80211_mod_tpt_led_trig(local,
1503                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1504
1505         /* add interfaces */
1506         sdata = rtnl_dereference(local->monitor_sdata);
1507         if (sdata) {
1508                 /* in HW restart it exists already */
1509                 WARN_ON(local->resuming);
1510                 res = drv_add_interface(local, sdata);
1511                 if (WARN_ON(res)) {
1512                         rcu_assign_pointer(local->monitor_sdata, NULL);
1513                         synchronize_net();
1514                         kfree(sdata);
1515                 }
1516         }
1517
1518         list_for_each_entry(sdata, &local->interfaces, list) {
1519                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1520                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1521                     ieee80211_sdata_running(sdata))
1522                         res = drv_add_interface(local, sdata);
1523         }
1524
1525         /* add channel contexts */
1526         if (local->use_chanctx) {
1527                 mutex_lock(&local->chanctx_mtx);
1528                 list_for_each_entry(ctx, &local->chanctx_list, list)
1529                         WARN_ON(drv_add_chanctx(local, ctx));
1530                 mutex_unlock(&local->chanctx_mtx);
1531         }
1532
1533         list_for_each_entry(sdata, &local->interfaces, list) {
1534                 if (!ieee80211_sdata_running(sdata))
1535                         continue;
1536                 ieee80211_assign_chanctx(local, sdata);
1537         }
1538
1539         sdata = rtnl_dereference(local->monitor_sdata);
1540         if (sdata && ieee80211_sdata_running(sdata))
1541                 ieee80211_assign_chanctx(local, sdata);
1542
1543         /* add STAs back */
1544         mutex_lock(&local->sta_mtx);
1545         list_for_each_entry(sta, &local->sta_list, list) {
1546                 enum ieee80211_sta_state state;
1547
1548                 if (!sta->uploaded)
1549                         continue;
1550
1551                 /* AP-mode stations will be added later */
1552                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1553                         continue;
1554
1555                 for (state = IEEE80211_STA_NOTEXIST;
1556                      state < sta->sta_state; state++)
1557                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1558                                               state + 1));
1559         }
1560         mutex_unlock(&local->sta_mtx);
1561
1562         /* reconfigure tx conf */
1563         if (hw->queues >= IEEE80211_NUM_ACS) {
1564                 list_for_each_entry(sdata, &local->interfaces, list) {
1565                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1566                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1567                             !ieee80211_sdata_running(sdata))
1568                                 continue;
1569
1570                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1571                                 drv_conf_tx(local, sdata, i,
1572                                             &sdata->tx_conf[i]);
1573                 }
1574         }
1575
1576         /* reconfigure hardware */
1577         ieee80211_hw_config(local, ~0);
1578
1579         ieee80211_configure_filter(local);
1580
1581         /* Finally also reconfigure all the BSS information */
1582         list_for_each_entry(sdata, &local->interfaces, list) {
1583                 u32 changed;
1584
1585                 if (!ieee80211_sdata_running(sdata))
1586                         continue;
1587
1588                 /* common change flags for all interface types */
1589                 changed = BSS_CHANGED_ERP_CTS_PROT |
1590                           BSS_CHANGED_ERP_PREAMBLE |
1591                           BSS_CHANGED_ERP_SLOT |
1592                           BSS_CHANGED_HT |
1593                           BSS_CHANGED_BASIC_RATES |
1594                           BSS_CHANGED_BEACON_INT |
1595                           BSS_CHANGED_BSSID |
1596                           BSS_CHANGED_CQM |
1597                           BSS_CHANGED_QOS |
1598                           BSS_CHANGED_IDLE |
1599                           BSS_CHANGED_TXPOWER;
1600
1601                 switch (sdata->vif.type) {
1602                 case NL80211_IFTYPE_STATION:
1603                         changed |= BSS_CHANGED_ASSOC |
1604                                    BSS_CHANGED_ARP_FILTER |
1605                                    BSS_CHANGED_PS;
1606
1607                         if (sdata->u.mgd.dtim_period)
1608                                 changed |= BSS_CHANGED_DTIM_PERIOD;
1609
1610                         mutex_lock(&sdata->u.mgd.mtx);
1611                         ieee80211_bss_info_change_notify(sdata, changed);
1612                         mutex_unlock(&sdata->u.mgd.mtx);
1613                         break;
1614                 case NL80211_IFTYPE_ADHOC:
1615                         changed |= BSS_CHANGED_IBSS;
1616                         /* fall through */
1617                 case NL80211_IFTYPE_AP:
1618                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1619
1620                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1621                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1622
1623                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1624                                         drv_start_ap(local, sdata);
1625                         }
1626
1627                         /* fall through */
1628                 case NL80211_IFTYPE_MESH_POINT:
1629                         if (sdata->vif.bss_conf.enable_beacon) {
1630                                 changed |= BSS_CHANGED_BEACON |
1631                                            BSS_CHANGED_BEACON_ENABLED;
1632                                 ieee80211_bss_info_change_notify(sdata, changed);
1633                         }
1634                         break;
1635                 case NL80211_IFTYPE_WDS:
1636                         break;
1637                 case NL80211_IFTYPE_AP_VLAN:
1638                 case NL80211_IFTYPE_MONITOR:
1639                         /* ignore virtual */
1640                         break;
1641                 case NL80211_IFTYPE_P2P_DEVICE:
1642                         changed = BSS_CHANGED_IDLE;
1643                         break;
1644                 case NL80211_IFTYPE_UNSPECIFIED:
1645                 case NUM_NL80211_IFTYPES:
1646                 case NL80211_IFTYPE_P2P_CLIENT:
1647                 case NL80211_IFTYPE_P2P_GO:
1648                         WARN_ON(1);
1649                         break;
1650                 }
1651         }
1652
1653         ieee80211_recalc_ps(local, -1);
1654
1655         /*
1656          * The sta might be in psm against the ap (e.g. because
1657          * this was the state before a hw restart), so we
1658          * explicitly send a null packet in order to make sure
1659          * it'll sync against the ap (and get out of psm).
1660          */
1661         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1662                 list_for_each_entry(sdata, &local->interfaces, list) {
1663                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1664                                 continue;
1665                         if (!sdata->u.mgd.associated)
1666                                 continue;
1667
1668                         ieee80211_send_nullfunc(local, sdata, 0);
1669                 }
1670         }
1671
1672         /* APs are now beaconing, add back stations */
1673         mutex_lock(&local->sta_mtx);
1674         list_for_each_entry(sta, &local->sta_list, list) {
1675                 enum ieee80211_sta_state state;
1676
1677                 if (!sta->uploaded)
1678                         continue;
1679
1680                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1681                         continue;
1682
1683                 for (state = IEEE80211_STA_NOTEXIST;
1684                      state < sta->sta_state; state++)
1685                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1686                                               state + 1));
1687         }
1688         mutex_unlock(&local->sta_mtx);
1689
1690         /* add back keys */
1691         list_for_each_entry(sdata, &local->interfaces, list)
1692                 if (ieee80211_sdata_running(sdata))
1693                         ieee80211_enable_keys(sdata);
1694
1695  wake_up:
1696         local->in_reconfig = false;
1697         barrier();
1698
1699         if (local->monitors == local->open_count && local->monitors > 0)
1700                 ieee80211_add_virtual_monitor(local);
1701
1702         /*
1703          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1704          * sessions can be established after a resume.
1705          *
1706          * Also tear down aggregation sessions since reconfiguring
1707          * them in a hardware restart scenario is not easily done
1708          * right now, and the hardware will have lost information
1709          * about the sessions, but we and the AP still think they
1710          * are active. This is really a workaround though.
1711          */
1712         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1713                 mutex_lock(&local->sta_mtx);
1714
1715                 list_for_each_entry(sta, &local->sta_list, list) {
1716                         ieee80211_sta_tear_down_BA_sessions(
1717                                         sta, AGG_STOP_LOCAL_REQUEST);
1718                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1719                 }
1720
1721                 mutex_unlock(&local->sta_mtx);
1722         }
1723
1724         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1725                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1726
1727         /*
1728          * If this is for hw restart things are still running.
1729          * We may want to change that later, however.
1730          */
1731         if (!local->suspended || reconfig_due_to_wowlan)
1732                 drv_restart_complete(local);
1733
1734         if (!local->suspended)
1735                 return 0;
1736
1737 #ifdef CONFIG_PM
1738         /* first set suspended false, then resuming */
1739         local->suspended = false;
1740         mb();
1741         local->resuming = false;
1742
1743         list_for_each_entry(sdata, &local->interfaces, list) {
1744                 if (!ieee80211_sdata_running(sdata))
1745                         continue;
1746                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1747                         ieee80211_sta_restart(sdata);
1748         }
1749
1750         mod_timer(&local->sta_cleanup, jiffies + 1);
1751 #else
1752         WARN_ON(1);
1753 #endif
1754         return 0;
1755 }
1756
1757 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1758 {
1759         struct ieee80211_sub_if_data *sdata;
1760         struct ieee80211_local *local;
1761         struct ieee80211_key *key;
1762
1763         if (WARN_ON(!vif))
1764                 return;
1765
1766         sdata = vif_to_sdata(vif);
1767         local = sdata->local;
1768
1769         if (WARN_ON(!local->resuming))
1770                 return;
1771
1772         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1773                 return;
1774
1775         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1776
1777         mutex_lock(&local->key_mtx);
1778         list_for_each_entry(key, &sdata->key_list, list)
1779                 key->flags |= KEY_FLAG_TAINTED;
1780         mutex_unlock(&local->key_mtx);
1781 }
1782 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1783
1784 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1785 {
1786         struct ieee80211_local *local = sdata->local;
1787         struct ieee80211_chanctx_conf *chanctx_conf;
1788         struct ieee80211_chanctx *chanctx;
1789
1790         mutex_lock(&local->chanctx_mtx);
1791
1792         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1793                                         lockdep_is_held(&local->chanctx_mtx));
1794
1795         if (WARN_ON_ONCE(!chanctx_conf))
1796                 goto unlock;
1797
1798         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1799         ieee80211_recalc_smps_chanctx(local, chanctx);
1800  unlock:
1801         mutex_unlock(&local->chanctx_mtx);
1802 }
1803
1804 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1805 {
1806         int i;
1807
1808         for (i = 0; i < n_ids; i++)
1809                 if (ids[i] == id)
1810                         return true;
1811         return false;
1812 }
1813
1814 /**
1815  * ieee80211_ie_split - split an IE buffer according to ordering
1816  *
1817  * @ies: the IE buffer
1818  * @ielen: the length of the IE buffer
1819  * @ids: an array with element IDs that are allowed before
1820  *      the split
1821  * @n_ids: the size of the element ID array
1822  * @offset: offset where to start splitting in the buffer
1823  *
1824  * This function splits an IE buffer by updating the @offset
1825  * variable to point to the location where the buffer should be
1826  * split.
1827  *
1828  * It assumes that the given IE buffer is well-formed, this
1829  * has to be guaranteed by the caller!
1830  *
1831  * It also assumes that the IEs in the buffer are ordered
1832  * correctly, if not the result of using this function will not
1833  * be ordered correctly either, i.e. it does no reordering.
1834  *
1835  * The function returns the offset where the next part of the
1836  * buffer starts, which may be @ielen if the entire (remainder)
1837  * of the buffer should be used.
1838  */
1839 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1840                           const u8 *ids, int n_ids, size_t offset)
1841 {
1842         size_t pos = offset;
1843
1844         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1845                 pos += 2 + ies[pos + 1];
1846
1847         return pos;
1848 }
1849
1850 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1851 {
1852         size_t pos = offset;
1853
1854         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1855                 pos += 2 + ies[pos + 1];
1856
1857         return pos;
1858 }
1859
1860 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1861                                             int rssi_min_thold,
1862                                             int rssi_max_thold)
1863 {
1864         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1865
1866         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1867                 return;
1868
1869         /*
1870          * Scale up threshold values before storing it, as the RSSI averaging
1871          * algorithm uses a scaled up value as well. Change this scaling
1872          * factor if the RSSI averaging algorithm changes.
1873          */
1874         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1875         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1876 }
1877
1878 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1879                                     int rssi_min_thold,
1880                                     int rssi_max_thold)
1881 {
1882         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1883
1884         WARN_ON(rssi_min_thold == rssi_max_thold ||
1885                 rssi_min_thold > rssi_max_thold);
1886
1887         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1888                                        rssi_max_thold);
1889 }
1890 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1891
1892 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1893 {
1894         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1895
1896         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1897 }
1898 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1899
1900 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1901                               u16 cap)
1902 {
1903         __le16 tmp;
1904
1905         *pos++ = WLAN_EID_HT_CAPABILITY;
1906         *pos++ = sizeof(struct ieee80211_ht_cap);
1907         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1908
1909         /* capability flags */
1910         tmp = cpu_to_le16(cap);
1911         memcpy(pos, &tmp, sizeof(u16));
1912         pos += sizeof(u16);
1913
1914         /* AMPDU parameters */
1915         *pos++ = ht_cap->ampdu_factor |
1916                  (ht_cap->ampdu_density <<
1917                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1918
1919         /* MCS set */
1920         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1921         pos += sizeof(ht_cap->mcs);
1922
1923         /* extended capabilities */
1924         pos += sizeof(__le16);
1925
1926         /* BF capabilities */
1927         pos += sizeof(__le32);
1928
1929         /* antenna selection */
1930         pos += sizeof(u8);
1931
1932         return pos;
1933 }
1934
1935 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1936                                u32 cap)
1937 {
1938         __le32 tmp;
1939
1940         *pos++ = WLAN_EID_VHT_CAPABILITY;
1941         *pos++ = sizeof(struct ieee80211_vht_cap);
1942         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1943
1944         /* capability flags */
1945         tmp = cpu_to_le32(cap);
1946         memcpy(pos, &tmp, sizeof(u32));
1947         pos += sizeof(u32);
1948
1949         /* VHT MCS set */
1950         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1951         pos += sizeof(vht_cap->vht_mcs);
1952
1953         return pos;
1954 }
1955
1956 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1957                                const struct cfg80211_chan_def *chandef,
1958                                u16 prot_mode)
1959 {
1960         struct ieee80211_ht_operation *ht_oper;
1961         /* Build HT Information */
1962         *pos++ = WLAN_EID_HT_OPERATION;
1963         *pos++ = sizeof(struct ieee80211_ht_operation);
1964         ht_oper = (struct ieee80211_ht_operation *)pos;
1965         ht_oper->primary_chan = ieee80211_frequency_to_channel(
1966                                         chandef->chan->center_freq);
1967         switch (chandef->width) {
1968         case NL80211_CHAN_WIDTH_160:
1969         case NL80211_CHAN_WIDTH_80P80:
1970         case NL80211_CHAN_WIDTH_80:
1971         case NL80211_CHAN_WIDTH_40:
1972                 if (chandef->center_freq1 > chandef->chan->center_freq)
1973                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1974                 else
1975                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1976                 break;
1977         default:
1978                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1979                 break;
1980         }
1981         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1982             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
1983             chandef->width != NL80211_CHAN_WIDTH_20)
1984                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1985
1986         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1987         ht_oper->stbc_param = 0x0000;
1988
1989         /* It seems that Basic MCS set and Supported MCS set
1990            are identical for the first 10 bytes */
1991         memset(&ht_oper->basic_set, 0, 16);
1992         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1993
1994         return pos + sizeof(struct ieee80211_ht_operation);
1995 }
1996
1997 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
1998                                   const struct ieee80211_ht_operation *ht_oper,
1999                                   struct cfg80211_chan_def *chandef)
2000 {
2001         enum nl80211_channel_type channel_type;
2002
2003         if (!ht_oper) {
2004                 cfg80211_chandef_create(chandef, control_chan,
2005                                         NL80211_CHAN_NO_HT);
2006                 return;
2007         }
2008
2009         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2010         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2011                 channel_type = NL80211_CHAN_HT20;
2012                 break;
2013         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2014                 channel_type = NL80211_CHAN_HT40PLUS;
2015                 break;
2016         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2017                 channel_type = NL80211_CHAN_HT40MINUS;
2018                 break;
2019         default:
2020                 channel_type = NL80211_CHAN_NO_HT;
2021         }
2022
2023         cfg80211_chandef_create(chandef, control_chan, channel_type);
2024 }
2025
2026 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2027                             struct sk_buff *skb, bool need_basic,
2028                             enum ieee80211_band band)
2029 {
2030         struct ieee80211_local *local = sdata->local;
2031         struct ieee80211_supported_band *sband;
2032         int rate;
2033         u8 i, rates, *pos;
2034         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2035
2036         sband = local->hw.wiphy->bands[band];
2037         rates = sband->n_bitrates;
2038         if (rates > 8)
2039                 rates = 8;
2040
2041         if (skb_tailroom(skb) < rates + 2)
2042                 return -ENOMEM;
2043
2044         pos = skb_put(skb, rates + 2);
2045         *pos++ = WLAN_EID_SUPP_RATES;
2046         *pos++ = rates;
2047         for (i = 0; i < rates; i++) {
2048                 u8 basic = 0;
2049                 if (need_basic && basic_rates & BIT(i))
2050                         basic = 0x80;
2051                 rate = sband->bitrates[i].bitrate;
2052                 *pos++ = basic | (u8) (rate / 5);
2053         }
2054
2055         return 0;
2056 }
2057
2058 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2059                                 struct sk_buff *skb, bool need_basic,
2060                                 enum ieee80211_band band)
2061 {
2062         struct ieee80211_local *local = sdata->local;
2063         struct ieee80211_supported_band *sband;
2064         int rate;
2065         u8 i, exrates, *pos;
2066         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2067
2068         sband = local->hw.wiphy->bands[band];
2069         exrates = sband->n_bitrates;
2070         if (exrates > 8)
2071                 exrates -= 8;
2072         else
2073                 exrates = 0;
2074
2075         if (skb_tailroom(skb) < exrates + 2)
2076                 return -ENOMEM;
2077
2078         if (exrates) {
2079                 pos = skb_put(skb, exrates + 2);
2080                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2081                 *pos++ = exrates;
2082                 for (i = 8; i < sband->n_bitrates; i++) {
2083                         u8 basic = 0;
2084                         if (need_basic && basic_rates & BIT(i))
2085                                 basic = 0x80;
2086                         rate = sband->bitrates[i].bitrate;
2087                         *pos++ = basic | (u8) (rate / 5);
2088                 }
2089         }
2090         return 0;
2091 }
2092
2093 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2094 {
2095         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2096         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2097
2098         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2099                 /* non-managed type inferfaces */
2100                 return 0;
2101         }
2102         return ifmgd->ave_beacon_signal / 16;
2103 }
2104 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2105
2106 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2107 {
2108         if (!mcs)
2109                 return 1;
2110
2111         /* TODO: consider rx_highest */
2112
2113         if (mcs->rx_mask[3])
2114                 return 4;
2115         if (mcs->rx_mask[2])
2116                 return 3;
2117         if (mcs->rx_mask[1])
2118                 return 2;
2119         return 1;
2120 }
2121
2122 /**
2123  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2124  * @local: mac80211 hw info struct
2125  * @status: RX status
2126  * @mpdu_len: total MPDU length (including FCS)
2127  * @mpdu_offset: offset into MPDU to calculate timestamp at
2128  *
2129  * This function calculates the RX timestamp at the given MPDU offset, taking
2130  * into account what the RX timestamp was. An offset of 0 will just normalize
2131  * the timestamp to TSF at beginning of MPDU reception.
2132  */
2133 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2134                                      struct ieee80211_rx_status *status,
2135                                      unsigned int mpdu_len,
2136                                      unsigned int mpdu_offset)
2137 {
2138         u64 ts = status->mactime;
2139         struct rate_info ri;
2140         u16 rate;
2141
2142         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2143                 return 0;
2144
2145         memset(&ri, 0, sizeof(ri));
2146
2147         /* Fill cfg80211 rate info */
2148         if (status->flag & RX_FLAG_HT) {
2149                 ri.mcs = status->rate_idx;
2150                 ri.flags |= RATE_INFO_FLAGS_MCS;
2151                 if (status->flag & RX_FLAG_40MHZ)
2152                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2153                 if (status->flag & RX_FLAG_SHORT_GI)
2154                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2155         } else if (status->flag & RX_FLAG_VHT) {
2156                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2157                 ri.mcs = status->rate_idx;
2158                 ri.nss = status->vht_nss;
2159                 if (status->flag & RX_FLAG_40MHZ)
2160                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2161                 if (status->flag & RX_FLAG_80MHZ)
2162                         ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2163                 if (status->flag & RX_FLAG_80P80MHZ)
2164                         ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2165                 if (status->flag & RX_FLAG_160MHZ)
2166                         ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2167                 if (status->flag & RX_FLAG_SHORT_GI)
2168                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2169         } else {
2170                 struct ieee80211_supported_band *sband;
2171
2172                 sband = local->hw.wiphy->bands[status->band];
2173                 ri.legacy = sband->bitrates[status->rate_idx].bitrate;
2174         }
2175
2176         rate = cfg80211_calculate_bitrate(&ri);
2177
2178         /* rewind from end of MPDU */
2179         if (status->flag & RX_FLAG_MACTIME_END)
2180                 ts -= mpdu_len * 8 * 10 / rate;
2181
2182         ts += mpdu_offset * 8 * 10 / rate;
2183
2184         return ts;
2185 }
2186
2187 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2188 {
2189         struct ieee80211_sub_if_data *sdata;
2190
2191         mutex_lock(&local->iflist_mtx);
2192         list_for_each_entry(sdata, &local->interfaces, list) {
2193                 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
2194
2195                 if (sdata->wdev.cac_started) {
2196                         ieee80211_vif_release_channel(sdata);
2197                         cfg80211_cac_event(sdata->dev,
2198                                            NL80211_RADAR_CAC_ABORTED,
2199                                            GFP_KERNEL);
2200                 }
2201         }
2202         mutex_unlock(&local->iflist_mtx);
2203 }
2204
2205 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2206 {
2207         struct ieee80211_local *local =
2208                 container_of(work, struct ieee80211_local, radar_detected_work);
2209         struct cfg80211_chan_def chandef;
2210
2211         ieee80211_dfs_cac_cancel(local);
2212
2213         if (local->use_chanctx)
2214                 /* currently not handled */
2215                 WARN_ON(1);
2216         else {
2217                 chandef = local->hw.conf.chandef;
2218                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2219         }
2220 }
2221
2222 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2223 {
2224         struct ieee80211_local *local = hw_to_local(hw);
2225
2226         trace_api_radar_detected(local);
2227
2228         ieee80211_queue_work(hw, &local->radar_detected_work);
2229 }
2230 EXPORT_SYMBOL(ieee80211_radar_detected);