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 (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 280                         continue;
 281
 282                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 283                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 284                         continue;
 285
 286                 for (ac = 0; ac < n_acs; ac++) {
 287                         int ac_queue = sdata->vif.hw_queue[ac];
 288
 289                         if (ac_queue == queue ||
 290                             (sdata->vif.cab_queue == queue &&
 291                              local->queue_stop_reasons[ac_queue] == 0 &&
 292                              skb_queue_empty(&local->pending[ac_queue])))
 293                                 netif_wake_subqueue(sdata->dev, ac);
 294                 }
 295         }
 296 }
 297
 298 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 299                                    enum queue_stop_reason reason)
 300 {
 301         struct ieee80211_local *local = hw_to_local(hw);
 302
 303         trace_wake_queue(local, queue, reason);
 304
 305         if (WARN_ON(queue >= hw->queues))
 306                 return;
 307
 308         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 309                 return;
 310
 311         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 312
 313         if (local->queue_stop_reasons[queue] != 0)
 314                 /* someone still has this queue stopped */
 315                 return;
 316
 317         if (skb_queue_empty(&local->pending[queue])) {
 318                 rcu_read_lock();
 319                 ieee80211_propagate_queue_wake(local, queue);
 320                 rcu_read_unlock();
 321         } else
 322                 tasklet_schedule(&local->tx_pending_tasklet);
 323 }
 324
 325 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 326                                     enum queue_stop_reason reason)
 327 {
 328         struct ieee80211_local *local = hw_to_local(hw);
 329         unsigned long flags;
 330
 331         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 332         __ieee80211_wake_queue(hw, queue, reason);
 333         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 334 }
 335
 336 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 337 {
 338         ieee80211_wake_queue_by_reason(hw, queue,
 339                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 340 }
 341 EXPORT_SYMBOL(ieee80211_wake_queue);
 342
 343 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 344                                    enum queue_stop_reason reason)
 345 {
 346         struct ieee80211_local *local = hw_to_local(hw);
 347         struct ieee80211_sub_if_data *sdata;
 348         int n_acs = IEEE80211_NUM_ACS;
 349
 350         trace_stop_queue(local, queue, reason);
 351
 352         if (WARN_ON(queue >= hw->queues))
 353                 return;
 354
 355         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 356                 return;
 357
 358         __set_bit(reason, &local->queue_stop_reasons[queue]);
 359
 360         if (local->hw.queues < IEEE80211_NUM_ACS)
 361                 n_acs = 1;
 362
 363         rcu_read_lock();
 364         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 365                 int ac;
 366
 367                 for (ac = 0; ac < n_acs; ac++) {
 368                         if (sdata->vif.hw_queue[ac] == queue ||
 369                             sdata->vif.cab_queue == queue)
 370                                 netif_stop_subqueue(sdata->dev, ac);
 371                 }
 372         }
 373         rcu_read_unlock();
 374 }
 375
 376 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 377                                     enum queue_stop_reason reason)
 378 {
 379         struct ieee80211_local *local = hw_to_local(hw);
 380         unsigned long flags;
 381
 382         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 383         __ieee80211_stop_queue(hw, queue, reason);
 384         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 385 }
 386
 387 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 388 {
 389         ieee80211_stop_queue_by_reason(hw, queue,
 390                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 391 }
 392 EXPORT_SYMBOL(ieee80211_stop_queue);
 393
 394 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 395                                struct sk_buff *skb)
 396 {
 397         struct ieee80211_hw *hw = &local->hw;
 398         unsigned long flags;
 399         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 400         int queue = info->hw_queue;
 401
 402         if (WARN_ON(!info->control.vif)) {
 403                 ieee80211_free_txskb(&local->hw, skb);
 404                 return;
 405         }
 406
 407         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 408         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 409         __skb_queue_tail(&local->pending[queue], skb);
 410         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 411         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 412 }
 413
 414 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 415                                    struct sk_buff_head *skbs,
 416                                    void (*fn)(void *data), void *data)
 417 {
 418         struct ieee80211_hw *hw = &local->hw;
 419         struct sk_buff *skb;
 420         unsigned long flags;
 421         int queue, i;
 422
 423         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 424         while ((skb = skb_dequeue(skbs))) {
 425                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 426
 427                 if (WARN_ON(!info->control.vif)) {
 428                         ieee80211_free_txskb(&local->hw, skb);
 429                         continue;
 430                 }
 431
 432                 queue = info->hw_queue;
 433
 434                 __ieee80211_stop_queue(hw, queue,
 435                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 436
 437                 __skb_queue_tail(&local->pending[queue], skb);
 438         }
 439
 440         if (fn)
 441                 fn(data);
 442
 443         for (i = 0; i < hw->queues; i++)
 444                 __ieee80211_wake_queue(hw, i,
 445                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 446         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 447 }
 448
 449 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 450                                     enum queue_stop_reason reason)
 451 {
 452         struct ieee80211_local *local = hw_to_local(hw);
 453         unsigned long flags;
 454         int i;
 455
 456         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 457
 458         for (i = 0; i < hw->queues; i++)
 459                 __ieee80211_stop_queue(hw, i, reason);
 460
 461         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 462 }
 463
 464 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 465 {
 466         ieee80211_stop_queues_by_reason(hw,
 467                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 468 }
 469 EXPORT_SYMBOL(ieee80211_stop_queues);
 470
 471 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 472 {
 473         struct ieee80211_local *local = hw_to_local(hw);
 474         unsigned long flags;
 475         int ret;
 476
 477         if (WARN_ON(queue >= hw->queues))
 478                 return true;
 479
 480         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 481         ret = !!local->queue_stop_reasons[queue];
 482         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 483         return ret;
 484 }
 485 EXPORT_SYMBOL(ieee80211_queue_stopped);
 486
 487 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 488                                      enum queue_stop_reason reason)
 489 {
 490         struct ieee80211_local *local = hw_to_local(hw);
 491         unsigned long flags;
 492         int i;
 493
 494         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 495
 496         for (i = 0; i < hw->queues; i++)
 497                 __ieee80211_wake_queue(hw, i, reason);
 498
 499         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 500 }
 501
 502 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 503 {
 504         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 505 }
 506 EXPORT_SYMBOL(ieee80211_wake_queues);
 507
 508 void ieee80211_iterate_active_interfaces(
 509         struct ieee80211_hw *hw,
 510         void (*iterator)(void *data, u8 *mac,
 511                          struct ieee80211_vif *vif),
 512         void *data)
 513 {
 514         struct ieee80211_local *local = hw_to_local(hw);
 515         struct ieee80211_sub_if_data *sdata;
 516
 517         mutex_lock(&local->iflist_mtx);
 518
 519         list_for_each_entry(sdata, &local->interfaces, list) {
 520                 switch (sdata->vif.type) {
 521                 case NL80211_IFTYPE_MONITOR:
 522                 case NL80211_IFTYPE_AP_VLAN:
 523                         continue;
 524                 default:
 525                         break;
 526                 }
 527                 if (ieee80211_sdata_running(sdata))
 528                         iterator(data, sdata->vif.addr,
 529                                  &sdata->vif);
 530         }
 531
 532         sdata = rcu_dereference_protected(local->monitor_sdata,
 533                                           lockdep_is_held(&local->iflist_mtx));
 534         if (sdata)
 535                 iterator(data, sdata->vif.addr, &sdata->vif);
 536
 537         mutex_unlock(&local->iflist_mtx);
 538 }
 539 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 540
 541 void ieee80211_iterate_active_interfaces_atomic(
 542         struct ieee80211_hw *hw,
 543         void (*iterator)(void *data, u8 *mac,
 544                          struct ieee80211_vif *vif),
 545         void *data)
 546 {
 547         struct ieee80211_local *local = hw_to_local(hw);
 548         struct ieee80211_sub_if_data *sdata;
 549
 550         rcu_read_lock();
 551
 552         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 553                 switch (sdata->vif.type) {
 554                 case NL80211_IFTYPE_MONITOR:
 555                 case NL80211_IFTYPE_AP_VLAN:
 556                         continue;
 557                 default:
 558                         break;
 559                 }
 560                 if (ieee80211_sdata_running(sdata))
 561                         iterator(data, sdata->vif.addr,
 562                                  &sdata->vif);
 563         }
 564
 565         sdata = rcu_dereference(local->monitor_sdata);
 566         if (sdata)
 567                 iterator(data, sdata->vif.addr, &sdata->vif);
 568
 569         rcu_read_unlock();
 570 }
 571 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 572
 573 /*
 574  * Nothing should have been stuffed into the workqueue during
 575  * the suspend->resume cycle. If this WARN is seen then there
 576  * is a bug with either the driver suspend or something in
 577  * mac80211 stuffing into the workqueue which we haven't yet
 578  * cleared during mac80211's suspend cycle.
 579  */
 580 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 581 {
 582         if (WARN(local->suspended && !local->resuming,
 583                  "queueing ieee80211 work while going to suspend\n"))
 584                 return false;
 585
 586         return true;
 587 }
 588
 589 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 590 {
 591         struct ieee80211_local *local = hw_to_local(hw);
 592
 593         if (!ieee80211_can_queue_work(local))
 594                 return;
 595
 596         queue_work(local->workqueue, work);
 597 }
 598 EXPORT_SYMBOL(ieee80211_queue_work);
 599
 600 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 601                                   struct delayed_work *dwork,
 602                                   unsigned long delay)
 603 {
 604         struct ieee80211_local *local = hw_to_local(hw);
 605
 606         if (!ieee80211_can_queue_work(local))
 607                 return;
 608
 609         queue_delayed_work(local->workqueue, dwork, delay);
 610 }
 611 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 612
 613 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 614                                struct ieee802_11_elems *elems,
 615                                u64 filter, u32 crc)
 616 {
 617         size_t left = len;
 618         u8 *pos = start;
 619         bool calc_crc = filter != 0;
 620         DECLARE_BITMAP(seen_elems, 256);
 621
 622         bitmap_zero(seen_elems, 256);
 623         memset(elems, 0, sizeof(*elems));
 624         elems->ie_start = start;
 625         elems->total_len = len;
 626
 627         while (left >= 2) {
 628                 u8 id, elen;
 629                 bool elem_parse_failed;
 630
 631                 id = *pos++;
 632                 elen = *pos++;
 633                 left -= 2;
 634
 635                 if (elen > left) {
 636                         elems->parse_error = true;
 637                         break;
 638                 }
 639
 640                 switch (id) {
 641                 case WLAN_EID_SSID:
 642                 case WLAN_EID_SUPP_RATES:
 643                 case WLAN_EID_FH_PARAMS:
 644                 case WLAN_EID_DS_PARAMS:
 645                 case WLAN_EID_CF_PARAMS:
 646                 case WLAN_EID_TIM:
 647                 case WLAN_EID_IBSS_PARAMS:
 648                 case WLAN_EID_CHALLENGE:
 649                 case WLAN_EID_RSN:
 650                 case WLAN_EID_ERP_INFO:
 651                 case WLAN_EID_EXT_SUPP_RATES:
 652                 case WLAN_EID_HT_CAPABILITY:
 653                 case WLAN_EID_HT_OPERATION:
 654                 case WLAN_EID_VHT_CAPABILITY:
 655                 case WLAN_EID_VHT_OPERATION:
 656                 case WLAN_EID_MESH_ID:
 657                 case WLAN_EID_MESH_CONFIG:
 658                 case WLAN_EID_PEER_MGMT:
 659                 case WLAN_EID_PREQ:
 660                 case WLAN_EID_PREP:
 661                 case WLAN_EID_PERR:
 662                 case WLAN_EID_RANN:
 663                 case WLAN_EID_CHANNEL_SWITCH:
 664                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 665                 case WLAN_EID_COUNTRY:
 666                 case WLAN_EID_PWR_CONSTRAINT:
 667                 case WLAN_EID_TIMEOUT_INTERVAL:
 668                         if (test_bit(id, seen_elems)) {
 669                                 elems->parse_error = true;
 670                                 left -= elen;
 671                                 pos += elen;
 672                                 continue;
 673                         }
 674                         break;
 675                 }
 676
 677                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 678                         crc = crc32_be(crc, pos - 2, elen + 2);
 679
 680                 elem_parse_failed = false;
 681
 682                 switch (id) {
 683                 case WLAN_EID_SSID:
 684                         elems->ssid = pos;
 685                         elems->ssid_len = elen;
 686                         break;
 687                 case WLAN_EID_SUPP_RATES:
 688                         elems->supp_rates = pos;
 689                         elems->supp_rates_len = elen;
 690                         break;
 691                 case WLAN_EID_FH_PARAMS:
 692                         elems->fh_params = pos;
 693                         elems->fh_params_len = elen;
 694                         break;
 695                 case WLAN_EID_DS_PARAMS:
 696                         elems->ds_params = pos;
 697                         elems->ds_params_len = elen;
 698                         break;
 699                 case WLAN_EID_CF_PARAMS:
 700                         elems->cf_params = pos;
 701                         elems->cf_params_len = elen;
 702                         break;
 703                 case WLAN_EID_TIM:
 704                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 705                                 elems->tim = (void *)pos;
 706                                 elems->tim_len = elen;
 707                         } else
 708                                 elem_parse_failed = true;
 709                         break;
 710                 case WLAN_EID_IBSS_PARAMS:
 711                         elems->ibss_params = pos;
 712                         elems->ibss_params_len = elen;
 713                         break;
 714                 case WLAN_EID_CHALLENGE:
 715                         elems->challenge = pos;
 716                         elems->challenge_len = elen;
 717                         break;
 718                 case WLAN_EID_VENDOR_SPECIFIC:
 719                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 720                             pos[2] == 0xf2) {
 721                                 /* Microsoft OUI (00:50:F2) */
 722
 723                                 if (calc_crc)
 724                                         crc = crc32_be(crc, pos - 2, elen + 2);
 725
 726                                 if (pos[3] == 1) {
 727                                         /* OUI Type 1 - WPA IE */
 728                                         elems->wpa = pos;
 729                                         elems->wpa_len = elen;
 730                                 } else if (elen >= 5 && pos[3] == 2) {
 731                                         /* OUI Type 2 - WMM IE */
 732                                         if (pos[4] == 0) {
 733                                                 elems->wmm_info = pos;
 734                                                 elems->wmm_info_len = elen;
 735                                         } else if (pos[4] == 1) {
 736                                                 elems->wmm_param = pos;
 737                                                 elems->wmm_param_len = elen;
 738                                         }
 739                                 }
 740                         }
 741                         break;
 742                 case WLAN_EID_RSN:
 743                         elems->rsn = pos;
 744                         elems->rsn_len = elen;
 745                         break;
 746                 case WLAN_EID_ERP_INFO:
 747                         elems->erp_info = pos;
 748                         elems->erp_info_len = elen;
 749                         break;
 750                 case WLAN_EID_EXT_SUPP_RATES:
 751                         elems->ext_supp_rates = pos;
 752                         elems->ext_supp_rates_len = elen;
 753                         break;
 754                 case WLAN_EID_HT_CAPABILITY:
 755                         if (elen >= sizeof(struct ieee80211_ht_cap))
 756                                 elems->ht_cap_elem = (void *)pos;
 757                         else
 758                                 elem_parse_failed = true;
 759                         break;
 760                 case WLAN_EID_HT_OPERATION:
 761                         if (elen >= sizeof(struct ieee80211_ht_operation))
 762                                 elems->ht_operation = (void *)pos;
 763                         else
 764                                 elem_parse_failed = true;
 765                         break;
 766                 case WLAN_EID_MESH_ID:
 767                         elems->mesh_id = pos;
 768                         elems->mesh_id_len = elen;
 769                         break;
 770                 case WLAN_EID_MESH_CONFIG:
 771                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 772                                 elems->mesh_config = (void *)pos;
 773                         else
 774                                 elem_parse_failed = true;
 775                         break;
 776                 case WLAN_EID_PEER_MGMT:
 777                         elems->peering = pos;
 778                         elems->peering_len = elen;
 779                         break;
 780                 case WLAN_EID_PREQ:
 781                         elems->preq = pos;
 782                         elems->preq_len = elen;
 783                         break;
 784                 case WLAN_EID_PREP:
 785                         elems->prep = pos;
 786                         elems->prep_len = elen;
 787                         break;
 788                 case WLAN_EID_PERR:
 789                         elems->perr = pos;
 790                         elems->perr_len = elen;
 791                         break;
 792                 case WLAN_EID_RANN:
 793                         if (elen >= sizeof(struct ieee80211_rann_ie))
 794                                 elems->rann = (void *)pos;
 795                         else
 796                                 elem_parse_failed = true;
 797                         break;
 798                 case WLAN_EID_CHANNEL_SWITCH:
 799                         elems->ch_switch_elem = pos;
 800                         elems->ch_switch_elem_len = elen;
 801                         break;
 802                 case WLAN_EID_QUIET:
 803                         if (!elems->quiet_elem) {
 804                                 elems->quiet_elem = pos;
 805                                 elems->quiet_elem_len = elen;
 806                         }
 807                         elems->num_of_quiet_elem++;
 808                         break;
 809                 case WLAN_EID_COUNTRY:
 810                         elems->country_elem = pos;
 811                         elems->country_elem_len = elen;
 812                         break;
 813                 case WLAN_EID_PWR_CONSTRAINT:
 814                         elems->pwr_constr_elem = pos;
 815                         elems->pwr_constr_elem_len = elen;
 816                         break;
 817                 case WLAN_EID_TIMEOUT_INTERVAL:
 818                         elems->timeout_int = pos;
 819                         elems->timeout_int_len = elen;
 820                         break;
 821                 default:
 822                         break;
 823                 }
 824
 825                 if (elem_parse_failed)
 826                         elems->parse_error = true;
 827                 else
 828                         set_bit(id, seen_elems);
 829
 830                 left -= elen;
 831                 pos += elen;
 832         }
 833
 834         if (left != 0)
 835                 elems->parse_error = true;
 836
 837         return crc;
 838 }
 839
 840 void ieee802_11_parse_elems(u8 *start, size_t len,
 841                             struct ieee802_11_elems *elems)
 842 {
 843         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 844 }
 845
 846 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 847                                bool bss_notify)
 848 {
 849         struct ieee80211_local *local = sdata->local;
 850         struct ieee80211_tx_queue_params qparam;
 851         int ac;
 852         bool use_11b, enable_qos;
 853         int aCWmin, aCWmax;
 854
 855         if (!local->ops->conf_tx)
 856                 return;
 857
 858         if (local->hw.queues < IEEE80211_NUM_ACS)
 859                 return;
 860
 861         memset(&qparam, 0, sizeof(qparam));
 862
 863         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 864                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 865
 866         /*
 867          * By default disable QoS in STA mode for old access points, which do
 868          * not support 802.11e. New APs will provide proper queue parameters,
 869          * that we will configure later.
 870          */
 871         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 872
 873         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 874                 /* Set defaults according to 802.11-2007 Table 7-37 */
 875                 aCWmax = 1023;
 876                 if (use_11b)
 877                         aCWmin = 31;
 878                 else
 879                         aCWmin = 15;
 880
 881                 if (enable_qos) {
 882                         switch (ac) {
 883                         case IEEE80211_AC_BK:
 884                                 qparam.cw_max = aCWmax;
 885                                 qparam.cw_min = aCWmin;
 886                                 qparam.txop = 0;
 887                                 qparam.aifs = 7;
 888                                 break;
 889                         /* never happens but let's not leave undefined */
 890                         default:
 891                         case IEEE80211_AC_BE:
 892                                 qparam.cw_max = aCWmax;
 893                                 qparam.cw_min = aCWmin;
 894                                 qparam.txop = 0;
 895                                 qparam.aifs = 3;
 896                                 break;
 897                         case IEEE80211_AC_VI:
 898                                 qparam.cw_max = aCWmin;
 899                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 900                                 if (use_11b)
 901                                         qparam.txop = 6016/32;
 902                                 else
 903                                         qparam.txop = 3008/32;
 904                                 qparam.aifs = 2;
 905                                 break;
 906                         case IEEE80211_AC_VO:
 907                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 908                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 909                                 if (use_11b)
 910                                         qparam.txop = 3264/32;
 911                                 else
 912                                         qparam.txop = 1504/32;
 913                                 qparam.aifs = 2;
 914                                 break;
 915                         }
 916                 } else {
 917                         /* Confiure old 802.11b/g medium access rules. */
 918                         qparam.cw_max = aCWmax;
 919                         qparam.cw_min = aCWmin;
 920                         qparam.txop = 0;
 921                         qparam.aifs = 2;
 922                 }
 923
 924                 qparam.uapsd = false;
 925
 926                 sdata->tx_conf[ac] = qparam;
 927                 drv_conf_tx(local, sdata, ac, &qparam);
 928         }
 929
 930         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 931                 sdata->vif.bss_conf.qos = enable_qos;
 932                 if (bss_notify)
 933                         ieee80211_bss_info_change_notify(sdata,
 934                                                          BSS_CHANGED_QOS);
 935         }
 936 }
 937
 938 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 939                                   const size_t supp_rates_len,
 940                                   const u8 *supp_rates)
 941 {
 942         struct ieee80211_local *local = sdata->local;
 943         int i, have_higher_than_11mbit = 0;
 944
 945         /* cf. IEEE 802.11 9.2.12 */
 946         for (i = 0; i < supp_rates_len; i++)
 947                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 948                         have_higher_than_11mbit = 1;
 949
 950         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 951             have_higher_than_11mbit)
 952                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 953         else
 954                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 955
 956         ieee80211_set_wmm_default(sdata, true);
 957 }
 958
 959 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 960                               enum ieee80211_band band)
 961 {
 962         struct ieee80211_supported_band *sband;
 963         struct ieee80211_rate *bitrates;
 964         u32 mandatory_rates;
 965         enum ieee80211_rate_flags mandatory_flag;
 966         int i;
 967
 968         sband = local->hw.wiphy->bands[band];
 969         if (WARN_ON(!sband))
 970                 return 1;
 971
 972         if (band == IEEE80211_BAND_2GHZ)
 973                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 974         else
 975                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 976
 977         bitrates = sband->bitrates;
 978         mandatory_rates = 0;
 979         for (i = 0; i < sband->n_bitrates; i++)
 980                 if (bitrates[i].flags & mandatory_flag)
 981                         mandatory_rates |= BIT(i);
 982         return mandatory_rates;
 983 }
 984
 985 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 986                          u16 transaction, u16 auth_alg,
 987                          u8 *extra, size_t extra_len, const u8 *da,
 988                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 989 {
 990         struct ieee80211_local *local = sdata->local;
 991         struct sk_buff *skb;
 992         struct ieee80211_mgmt *mgmt;
 993         int err;
 994
 995         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 996                             sizeof(*mgmt) + 6 + extra_len);
 997         if (!skb)
 998                 return;
 999
1000         skb_reserve(skb, local->hw.extra_tx_headroom);
1001
1002         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1003         memset(mgmt, 0, 24 + 6);
1004         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1005                                           IEEE80211_STYPE_AUTH);
1006         memcpy(mgmt->da, da, ETH_ALEN);
1007         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1008         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1009         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1010         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1011         mgmt->u.auth.status_code = cpu_to_le16(0);
1012         if (extra)
1013                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1014
1015         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1016                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1017                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1018                 WARN_ON(err);
1019         }
1020
1021         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1022         ieee80211_tx_skb(sdata, skb);
1023 }
1024
1025 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1026                              const u8 *ie, size_t ie_len,
1027                              enum ieee80211_band band, u32 rate_mask,
1028                              u8 channel)
1029 {
1030         struct ieee80211_supported_band *sband;
1031         u8 *pos;
1032         size_t offset = 0, noffset;
1033         int supp_rates_len, i;
1034         u8 rates[32];
1035         int num_rates;
1036         int ext_rates_len;
1037
1038         sband = local->hw.wiphy->bands[band];
1039         if (WARN_ON_ONCE(!sband))
1040                 return 0;
1041
1042         pos = buffer;
1043
1044         num_rates = 0;
1045         for (i = 0; i < sband->n_bitrates; i++) {
1046                 if ((BIT(i) & rate_mask) == 0)
1047                         continue; /* skip rate */
1048                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1049         }
1050
1051         supp_rates_len = min_t(int, num_rates, 8);
1052
1053         *pos++ = WLAN_EID_SUPP_RATES;
1054         *pos++ = supp_rates_len;
1055         memcpy(pos, rates, supp_rates_len);
1056         pos += supp_rates_len;
1057
1058         /* insert "request information" if in custom IEs */
1059         if (ie && ie_len) {
1060                 static const u8 before_extrates[] = {
1061                         WLAN_EID_SSID,
1062                         WLAN_EID_SUPP_RATES,
1063                         WLAN_EID_REQUEST,
1064                 };
1065                 noffset = ieee80211_ie_split(ie, ie_len,
1066                                              before_extrates,
1067                                              ARRAY_SIZE(before_extrates),
1068                                              offset);
1069                 memcpy(pos, ie + offset, noffset - offset);
1070                 pos += noffset - offset;
1071                 offset = noffset;
1072         }
1073
1074         ext_rates_len = num_rates - supp_rates_len;
1075         if (ext_rates_len > 0) {
1076                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1077                 *pos++ = ext_rates_len;
1078                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1079                 pos += ext_rates_len;
1080         }
1081
1082         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1083                 *pos++ = WLAN_EID_DS_PARAMS;
1084                 *pos++ = 1;
1085                 *pos++ = channel;
1086         }
1087
1088         /* insert custom IEs that go before HT */
1089         if (ie && ie_len) {
1090                 static const u8 before_ht[] = {
1091                         WLAN_EID_SSID,
1092                         WLAN_EID_SUPP_RATES,
1093                         WLAN_EID_REQUEST,
1094                         WLAN_EID_EXT_SUPP_RATES,
1095                         WLAN_EID_DS_PARAMS,
1096                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1097                 };
1098                 noffset = ieee80211_ie_split(ie, ie_len,
1099                                              before_ht, ARRAY_SIZE(before_ht),
1100                                              offset);
1101                 memcpy(pos, ie + offset, noffset - offset);
1102                 pos += noffset - offset;
1103                 offset = noffset;
1104         }
1105
1106         if (sband->ht_cap.ht_supported)
1107                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1108                                                 sband->ht_cap.cap);
1109
1110         /*
1111          * If adding more here, adjust code in main.c
1112          * that calculates local->scan_ies_len.
1113          */
1114
1115         /* add any remaining custom IEs */
1116         if (ie && ie_len) {
1117                 noffset = ie_len;
1118                 memcpy(pos, ie + offset, noffset - offset);
1119                 pos += noffset - offset;
1120         }
1121
1122         if (sband->vht_cap.vht_supported)
1123                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1124                                                  sband->vht_cap.cap);
1125
1126         return pos - buffer;
1127 }
1128
1129 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1130                                           u8 *dst, u32 ratemask,
1131                                           const u8 *ssid, size_t ssid_len,
1132                                           const u8 *ie, size_t ie_len,
1133                                           bool directed)
1134 {
1135         struct ieee80211_local *local = sdata->local;
1136         struct sk_buff *skb;
1137         struct ieee80211_mgmt *mgmt;
1138         size_t buf_len;
1139         u8 *buf;
1140         u8 chan;
1141
1142         /* FIXME: come up with a proper value */
1143         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1144         if (!buf)
1145                 return NULL;
1146
1147         /*
1148          * Do not send DS Channel parameter for directed probe requests
1149          * in order to maximize the chance that we get a response.  Some
1150          * badly-behaved APs don't respond when this parameter is included.
1151          */
1152         if (directed)
1153                 chan = 0;
1154         else
1155                 chan = ieee80211_frequency_to_channel(
1156                         local->hw.conf.channel->center_freq);
1157
1158         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1159                                            local->hw.conf.channel->band,
1160                                            ratemask, chan);
1161
1162         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1163                                      ssid, ssid_len,
1164                                      buf, buf_len);
1165         if (!skb)
1166                 goto out;
1167
1168         if (dst) {
1169                 mgmt = (struct ieee80211_mgmt *) skb->data;
1170                 memcpy(mgmt->da, dst, ETH_ALEN);
1171                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1172         }
1173
1174         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1175
1176  out:
1177         kfree(buf);
1178
1179         return skb;
1180 }
1181
1182 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1183                               const u8 *ssid, size_t ssid_len,
1184                               const u8 *ie, size_t ie_len,
1185                               u32 ratemask, bool directed, bool no_cck)
1186 {
1187         struct sk_buff *skb;
1188
1189         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1190                                         ie, ie_len, directed);
1191         if (skb) {
1192                 if (no_cck)
1193                         IEEE80211_SKB_CB(skb)->flags |=
1194                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1195                 ieee80211_tx_skb(sdata, skb);
1196         }
1197 }
1198
1199 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1200                             struct ieee802_11_elems *elems,
1201                             enum ieee80211_band band, u32 *basic_rates)
1202 {
1203         struct ieee80211_supported_band *sband;
1204         struct ieee80211_rate *bitrates;
1205         size_t num_rates;
1206         u32 supp_rates;
1207         int i, j;
1208         sband = local->hw.wiphy->bands[band];
1209
1210         if (WARN_ON(!sband))
1211                 return 1;
1212
1213         bitrates = sband->bitrates;
1214         num_rates = sband->n_bitrates;
1215         supp_rates = 0;
1216         for (i = 0; i < elems->supp_rates_len +
1217                      elems->ext_supp_rates_len; i++) {
1218                 u8 rate = 0;
1219                 int own_rate;
1220                 bool is_basic;
1221                 if (i < elems->supp_rates_len)
1222                         rate = elems->supp_rates[i];
1223                 else if (elems->ext_supp_rates)
1224                         rate = elems->ext_supp_rates
1225                                 [i - elems->supp_rates_len];
1226                 own_rate = 5 * (rate & 0x7f);
1227                 is_basic = !!(rate & 0x80);
1228
1229                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1230                         continue;
1231
1232                 for (j = 0; j < num_rates; j++) {
1233                         if (bitrates[j].bitrate == own_rate) {
1234                                 supp_rates |= BIT(j);
1235                                 if (basic_rates && is_basic)
1236                                         *basic_rates |= BIT(j);
1237                         }
1238                 }
1239         }
1240         return supp_rates;
1241 }
1242
1243 void ieee80211_stop_device(struct ieee80211_local *local)
1244 {
1245         ieee80211_led_radio(local, false);
1246         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1247
1248         cancel_work_sync(&local->reconfig_filter);
1249
1250         flush_workqueue(local->workqueue);
1251         drv_stop(local);
1252 }
1253
1254 int ieee80211_reconfig(struct ieee80211_local *local)
1255 {
1256         struct ieee80211_hw *hw = &local->hw;
1257         struct ieee80211_sub_if_data *sdata;
1258         struct sta_info *sta;
1259         int res, i;
1260
1261 #ifdef CONFIG_PM
1262         if (local->suspended)
1263                 local->resuming = true;
1264
1265         if (local->wowlan) {
1266                 local->wowlan = false;
1267                 res = drv_resume(local);
1268                 if (res < 0) {
1269                         local->resuming = false;
1270                         return res;
1271                 }
1272                 if (res == 0)
1273                         goto wake_up;
1274                 WARN_ON(res > 1);
1275                 /*
1276                  * res is 1, which means the driver requested
1277                  * to go through a regular reset on wakeup.
1278                  */
1279         }
1280 #endif
1281         /* everything else happens only if HW was up & running */
1282         if (!local->open_count)
1283                 goto wake_up;
1284
1285         /*
1286          * Upon resume hardware can sometimes be goofy due to
1287          * various platform / driver / bus issues, so restarting
1288          * the device may at times not work immediately. Propagate
1289          * the error.
1290          */
1291         res = drv_start(local);
1292         if (res) {
1293                 WARN(local->suspended, "Hardware became unavailable "
1294                      "upon resume. This could be a software issue "
1295                      "prior to suspend or a hardware issue.\n");
1296                 return res;
1297         }
1298
1299         /* setup fragmentation threshold */
1300         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1301
1302         /* setup RTS threshold */
1303         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1304
1305         /* reset coverage class */
1306         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1307
1308         ieee80211_led_radio(local, true);
1309         ieee80211_mod_tpt_led_trig(local,
1310                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1311
1312         /* add interfaces */
1313         sdata = rtnl_dereference(local->monitor_sdata);
1314         if (sdata) {
1315                 res = drv_add_interface(local, sdata);
1316                 if (WARN_ON(res)) {
1317                         rcu_assign_pointer(local->monitor_sdata, NULL);
1318                         synchronize_net();
1319                         kfree(sdata);
1320                 }
1321         }
1322
1323         list_for_each_entry(sdata, &local->interfaces, list) {
1324                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1325                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1326                     ieee80211_sdata_running(sdata))
1327                         res = drv_add_interface(local, sdata);
1328         }
1329
1330         /* add STAs back */
1331         mutex_lock(&local->sta_mtx);
1332         list_for_each_entry(sta, &local->sta_list, list) {
1333                 enum ieee80211_sta_state state;
1334
1335                 if (!sta->uploaded)
1336                         continue;
1337
1338                 /* AP-mode stations will be added later */
1339                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1340                         continue;
1341
1342                 for (state = IEEE80211_STA_NOTEXIST;
1343                      state < sta->sta_state; state++)
1344                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1345                                               state + 1));
1346         }
1347         mutex_unlock(&local->sta_mtx);
1348
1349         /* reconfigure tx conf */
1350         if (hw->queues >= IEEE80211_NUM_ACS) {
1351                 list_for_each_entry(sdata, &local->interfaces, list) {
1352                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1353                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1354                             !ieee80211_sdata_running(sdata))
1355                                 continue;
1356
1357                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1358                                 drv_conf_tx(local, sdata, i,
1359                                             &sdata->tx_conf[i]);
1360                 }
1361         }
1362
1363         /* reconfigure hardware */
1364         ieee80211_hw_config(local, ~0);
1365
1366         ieee80211_configure_filter(local);
1367
1368         /* Finally also reconfigure all the BSS information */
1369         list_for_each_entry(sdata, &local->interfaces, list) {
1370                 u32 changed;
1371
1372                 if (!ieee80211_sdata_running(sdata))
1373                         continue;
1374
1375                 /* common change flags for all interface types */
1376                 changed = BSS_CHANGED_ERP_CTS_PROT |
1377                           BSS_CHANGED_ERP_PREAMBLE |
1378                           BSS_CHANGED_ERP_SLOT |
1379                           BSS_CHANGED_HT |
1380                           BSS_CHANGED_BASIC_RATES |
1381                           BSS_CHANGED_BEACON_INT |
1382                           BSS_CHANGED_BSSID |
1383                           BSS_CHANGED_CQM |
1384                           BSS_CHANGED_QOS |
1385                           BSS_CHANGED_IDLE;
1386
1387                 switch (sdata->vif.type) {
1388                 case NL80211_IFTYPE_STATION:
1389                         changed |= BSS_CHANGED_ASSOC |
1390                                    BSS_CHANGED_ARP_FILTER;
1391                         mutex_lock(&sdata->u.mgd.mtx);
1392                         ieee80211_bss_info_change_notify(sdata, changed);
1393                         mutex_unlock(&sdata->u.mgd.mtx);
1394                         break;
1395                 case NL80211_IFTYPE_ADHOC:
1396                         changed |= BSS_CHANGED_IBSS;
1397                         /* fall through */
1398                 case NL80211_IFTYPE_AP:
1399                         changed |= BSS_CHANGED_SSID;
1400
1401                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1402                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1403
1404                         /* fall through */
1405                 case NL80211_IFTYPE_MESH_POINT:
1406                         changed |= BSS_CHANGED_BEACON |
1407                                    BSS_CHANGED_BEACON_ENABLED;
1408                         ieee80211_bss_info_change_notify(sdata, changed);
1409                         break;
1410                 case NL80211_IFTYPE_WDS:
1411                         break;
1412                 case NL80211_IFTYPE_AP_VLAN:
1413                 case NL80211_IFTYPE_MONITOR:
1414                         /* ignore virtual */
1415                         break;
1416                 case NL80211_IFTYPE_UNSPECIFIED:
1417                 case NUM_NL80211_IFTYPES:
1418                 case NL80211_IFTYPE_P2P_CLIENT:
1419                 case NL80211_IFTYPE_P2P_GO:
1420                         WARN_ON(1);
1421                         break;
1422                 }
1423         }
1424
1425         ieee80211_recalc_ps(local, -1);
1426
1427         /*
1428          * The sta might be in psm against the ap (e.g. because
1429          * this was the state before a hw restart), so we
1430          * explicitly send a null packet in order to make sure
1431          * it'll sync against the ap (and get out of psm).
1432          */
1433         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1434                 list_for_each_entry(sdata, &local->interfaces, list) {
1435                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1436                                 continue;
1437
1438                         ieee80211_send_nullfunc(local, sdata, 0);
1439                 }
1440         }
1441
1442         /* APs are now beaconing, add back stations */
1443         mutex_lock(&local->sta_mtx);
1444         list_for_each_entry(sta, &local->sta_list, list) {
1445                 enum ieee80211_sta_state state;
1446
1447                 if (!sta->uploaded)
1448                         continue;
1449
1450                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1451                         continue;
1452
1453                 for (state = IEEE80211_STA_NOTEXIST;
1454                      state < sta->sta_state; state++)
1455                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1456                                               state + 1));
1457         }
1458         mutex_unlock(&local->sta_mtx);
1459
1460         /* add back keys */
1461         list_for_each_entry(sdata, &local->interfaces, list)
1462                 if (ieee80211_sdata_running(sdata))
1463                         ieee80211_enable_keys(sdata);
1464
1465  wake_up:
1466         local->in_reconfig = false;
1467         barrier();
1468
1469         /*
1470          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1471          * sessions can be established after a resume.
1472          *
1473          * Also tear down aggregation sessions since reconfiguring
1474          * them in a hardware restart scenario is not easily done
1475          * right now, and the hardware will have lost information
1476          * about the sessions, but we and the AP still think they
1477          * are active. This is really a workaround though.
1478          */
1479         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1480                 mutex_lock(&local->sta_mtx);
1481
1482                 list_for_each_entry(sta, &local->sta_list, list) {
1483                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1484                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1485                 }
1486
1487                 mutex_unlock(&local->sta_mtx);
1488         }
1489
1490         ieee80211_wake_queues_by_reason(hw,
1491                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1492
1493         /*
1494          * If this is for hw restart things are still running.
1495          * We may want to change that later, however.
1496          */
1497         if (!local->suspended)
1498                 return 0;
1499
1500 #ifdef CONFIG_PM
1501         /* first set suspended false, then resuming */
1502         local->suspended = false;
1503         mb();
1504         local->resuming = false;
1505
1506         list_for_each_entry(sdata, &local->interfaces, list) {
1507                 switch(sdata->vif.type) {
1508                 case NL80211_IFTYPE_STATION:
1509                         ieee80211_sta_restart(sdata);
1510                         break;
1511                 case NL80211_IFTYPE_ADHOC:
1512                         ieee80211_ibss_restart(sdata);
1513                         break;
1514                 case NL80211_IFTYPE_MESH_POINT:
1515                         ieee80211_mesh_restart(sdata);
1516                         break;
1517                 default:
1518                         break;
1519                 }
1520         }
1521
1522         mod_timer(&local->sta_cleanup, jiffies + 1);
1523
1524         mutex_lock(&local->sta_mtx);
1525         list_for_each_entry(sta, &local->sta_list, list)
1526                 mesh_plink_restart(sta);
1527         mutex_unlock(&local->sta_mtx);
1528 #else
1529         WARN_ON(1);
1530 #endif
1531         return 0;
1532 }
1533
1534 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1535 {
1536         struct ieee80211_sub_if_data *sdata;
1537         struct ieee80211_local *local;
1538         struct ieee80211_key *key;
1539
1540         if (WARN_ON(!vif))
1541                 return;
1542
1543         sdata = vif_to_sdata(vif);
1544         local = sdata->local;
1545
1546         if (WARN_ON(!local->resuming))
1547                 return;
1548
1549         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1550                 return;
1551
1552         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1553
1554         mutex_lock(&local->key_mtx);
1555         list_for_each_entry(key, &sdata->key_list, list)
1556                 key->flags |= KEY_FLAG_TAINTED;
1557         mutex_unlock(&local->key_mtx);
1558 }
1559 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1560
1561 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1562                           enum ieee80211_smps_mode *smps_mode)
1563 {
1564         if (ifmgd->associated) {
1565                 *smps_mode = ifmgd->ap_smps;
1566
1567                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1568                         if (ifmgd->powersave)
1569                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1570                         else
1571                                 *smps_mode = IEEE80211_SMPS_OFF;
1572                 }
1573
1574                 return 1;
1575         }
1576
1577         return 0;
1578 }
1579
1580 /* must hold iflist_mtx */
1581 void ieee80211_recalc_smps(struct ieee80211_local *local)
1582 {
1583         struct ieee80211_sub_if_data *sdata;
1584         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1585         int count = 0;
1586
1587         lockdep_assert_held(&local->iflist_mtx);
1588
1589         /*
1590          * This function could be improved to handle multiple
1591          * interfaces better, but right now it makes any
1592          * non-station interfaces force SM PS to be turned
1593          * off. If there are multiple station interfaces it
1594          * could also use the best possible mode, e.g. if
1595          * one is in static and the other in dynamic then
1596          * dynamic is ok.
1597          */
1598
1599         list_for_each_entry(sdata, &local->interfaces, list) {
1600                 if (!ieee80211_sdata_running(sdata))
1601                         continue;
1602                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1603                         goto set;
1604
1605                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1606
1607                 if (count > 1) {
1608                         smps_mode = IEEE80211_SMPS_OFF;
1609                         break;
1610                 }
1611         }
1612
1613         if (smps_mode == local->smps_mode)
1614                 return;
1615
1616  set:
1617         local->smps_mode = smps_mode;
1618         /* changed flag is auto-detected for this */
1619         ieee80211_hw_config(local, 0);
1620 }
1621
1622 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1623 {
1624         int i;
1625
1626         for (i = 0; i < n_ids; i++)
1627                 if (ids[i] == id)
1628                         return true;
1629         return false;
1630 }
1631
1632 /**
1633  * ieee80211_ie_split - split an IE buffer according to ordering
1634  *
1635  * @ies: the IE buffer
1636  * @ielen: the length of the IE buffer
1637  * @ids: an array with element IDs that are allowed before
1638  *      the split
1639  * @n_ids: the size of the element ID array
1640  * @offset: offset where to start splitting in the buffer
1641  *
1642  * This function splits an IE buffer by updating the @offset
1643  * variable to point to the location where the buffer should be
1644  * split.
1645  *
1646  * It assumes that the given IE buffer is well-formed, this
1647  * has to be guaranteed by the caller!
1648  *
1649  * It also assumes that the IEs in the buffer are ordered
1650  * correctly, if not the result of using this function will not
1651  * be ordered correctly either, i.e. it does no reordering.
1652  *
1653  * The function returns the offset where the next part of the
1654  * buffer starts, which may be @ielen if the entire (remainder)
1655  * of the buffer should be used.
1656  */
1657 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1658                           const u8 *ids, int n_ids, size_t offset)
1659 {
1660         size_t pos = offset;
1661
1662         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1663                 pos += 2 + ies[pos + 1];
1664
1665         return pos;
1666 }
1667
1668 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1669 {
1670         size_t pos = offset;
1671
1672         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1673                 pos += 2 + ies[pos + 1];
1674
1675         return pos;
1676 }
1677
1678 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1679                                             int rssi_min_thold,
1680                                             int rssi_max_thold)
1681 {
1682         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1683
1684         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1685                 return;
1686
1687         /*
1688          * Scale up threshold values before storing it, as the RSSI averaging
1689          * algorithm uses a scaled up value as well. Change this scaling
1690          * factor if the RSSI averaging algorithm changes.
1691          */
1692         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1693         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1694 }
1695
1696 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1697                                     int rssi_min_thold,
1698                                     int rssi_max_thold)
1699 {
1700         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1701
1702         WARN_ON(rssi_min_thold == rssi_max_thold ||
1703                 rssi_min_thold > rssi_max_thold);
1704
1705         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1706                                        rssi_max_thold);
1707 }
1708 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1709
1710 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1711 {
1712         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1713
1714         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1715 }
1716 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1717
1718 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1719                               u16 cap)
1720 {
1721         __le16 tmp;
1722
1723         *pos++ = WLAN_EID_HT_CAPABILITY;
1724         *pos++ = sizeof(struct ieee80211_ht_cap);
1725         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1726
1727         /* capability flags */
1728         tmp = cpu_to_le16(cap);
1729         memcpy(pos, &tmp, sizeof(u16));
1730         pos += sizeof(u16);
1731
1732         /* AMPDU parameters */
1733         *pos++ = ht_cap->ampdu_factor |
1734                  (ht_cap->ampdu_density <<
1735                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1736
1737         /* MCS set */
1738         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1739         pos += sizeof(ht_cap->mcs);
1740
1741         /* extended capabilities */
1742         pos += sizeof(__le16);
1743
1744         /* BF capabilities */
1745         pos += sizeof(__le32);
1746
1747         /* antenna selection */
1748         pos += sizeof(u8);
1749
1750         return pos;
1751 }
1752
1753 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1754                                                            u32 cap)
1755 {
1756         __le32 tmp;
1757
1758         *pos++ = WLAN_EID_VHT_CAPABILITY;
1759         *pos++ = sizeof(struct ieee80211_vht_capabilities);
1760         memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1761
1762         /* capability flags */
1763         tmp = cpu_to_le32(cap);
1764         memcpy(pos, &tmp, sizeof(u32));
1765         pos += sizeof(u32);
1766
1767         /* VHT MCS set */
1768         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1769         pos += sizeof(vht_cap->vht_mcs);
1770
1771         return pos;
1772 }
1773
1774 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1775                                struct ieee80211_channel *channel,
1776                                enum nl80211_channel_type channel_type,
1777                                u16 prot_mode)
1778 {
1779         struct ieee80211_ht_operation *ht_oper;
1780         /* Build HT Information */
1781         *pos++ = WLAN_EID_HT_OPERATION;
1782         *pos++ = sizeof(struct ieee80211_ht_operation);
1783         ht_oper = (struct ieee80211_ht_operation *)pos;
1784         ht_oper->primary_chan =
1785                         ieee80211_frequency_to_channel(channel->center_freq);
1786         switch (channel_type) {
1787         case NL80211_CHAN_HT40MINUS:
1788                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1789                 break;
1790         case NL80211_CHAN_HT40PLUS:
1791                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1792                 break;
1793         case NL80211_CHAN_HT20:
1794         default:
1795                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1796                 break;
1797         }
1798         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1799             channel_type != NL80211_CHAN_NO_HT &&
1800             channel_type != NL80211_CHAN_HT20)
1801                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1802
1803         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1804         ht_oper->stbc_param = 0x0000;
1805
1806         /* It seems that Basic MCS set and Supported MCS set
1807            are identical for the first 10 bytes */
1808         memset(&ht_oper->basic_set, 0, 16);
1809         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1810
1811         return pos + sizeof(struct ieee80211_ht_operation);
1812 }
1813
1814 enum nl80211_channel_type
1815 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1816 {
1817         enum nl80211_channel_type channel_type;
1818
1819         if (!ht_oper)
1820                 return NL80211_CHAN_NO_HT;
1821
1822         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1823         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1824                 channel_type = NL80211_CHAN_HT20;
1825                 break;
1826         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1827                 channel_type = NL80211_CHAN_HT40PLUS;
1828                 break;
1829         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1830                 channel_type = NL80211_CHAN_HT40MINUS;
1831                 break;
1832         default:
1833                 channel_type = NL80211_CHAN_NO_HT;
1834         }
1835
1836         return channel_type;
1837 }
1838
1839 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1840                             struct sk_buff *skb, bool need_basic)
1841 {
1842         struct ieee80211_local *local = sdata->local;
1843         struct ieee80211_supported_band *sband;
1844         int rate;
1845         u8 i, rates, *pos;
1846         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1847
1848         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1849         rates = sband->n_bitrates;
1850         if (rates > 8)
1851                 rates = 8;
1852
1853         if (skb_tailroom(skb) < rates + 2)
1854                 return -ENOMEM;
1855
1856         pos = skb_put(skb, rates + 2);
1857         *pos++ = WLAN_EID_SUPP_RATES;
1858         *pos++ = rates;
1859         for (i = 0; i < rates; i++) {
1860                 u8 basic = 0;
1861                 if (need_basic && basic_rates & BIT(i))
1862                         basic = 0x80;
1863                 rate = sband->bitrates[i].bitrate;
1864                 *pos++ = basic | (u8) (rate / 5);
1865         }
1866
1867         return 0;
1868 }
1869
1870 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1871                                 struct sk_buff *skb, bool need_basic)
1872 {
1873         struct ieee80211_local *local = sdata->local;
1874         struct ieee80211_supported_band *sband;
1875         int rate;
1876         u8 i, exrates, *pos;
1877         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1878
1879         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1880         exrates = sband->n_bitrates;
1881         if (exrates > 8)
1882                 exrates -= 8;
1883         else
1884                 exrates = 0;
1885
1886         if (skb_tailroom(skb) < exrates + 2)
1887                 return -ENOMEM;
1888
1889         if (exrates) {
1890                 pos = skb_put(skb, exrates + 2);
1891                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1892                 *pos++ = exrates;
1893                 for (i = 8; i < sband->n_bitrates; i++) {
1894                         u8 basic = 0;
1895                         if (need_basic && basic_rates & BIT(i))
1896                                 basic = 0x80;
1897                         rate = sband->bitrates[i].bitrate;
1898                         *pos++ = basic | (u8) (rate / 5);
1899                 }
1900         }
1901         return 0;
1902 }
1903
1904 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1905 {
1906         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1907         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1908
1909         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1910                 /* non-managed type inferfaces */
1911                 return 0;
1912         }
1913         return ifmgd->ave_beacon_signal;
1914 }
1915 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);