Pileus Git - ~andy/linux/blob - 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/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/bitmap.h>
  22 #include <net/net_namespace.h>
  23 #include <net/cfg80211.h>
  24 #include <net/rtnetlink.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "driver-ops.h"
  28 #include "rate.h"
  29 #include "mesh.h"
  30 #include "wme.h"
  31 #include "led.h"
  32 #include "wep.h"
  33
  34 /* privid for wiphys to determine whether they belong to us or not */
  35 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  36
  37 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  38 {
  39         struct ieee80211_local *local;
  40         BUG_ON(!wiphy);
  41
  42         local = wiphy_priv(wiphy);
  43         return &local->hw;
  44 }
  45 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  46
  47 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  48                         enum nl80211_iftype type)
  49 {
  50         __le16 fc = hdr->frame_control;
  51
  52          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  53         if (len < 16)
  54                 return NULL;
  55
  56         if (ieee80211_is_data(fc)) {
  57                 if (len < 24) /* drop incorrect hdr len (data) */
  58                         return NULL;
  59
  60                 if (ieee80211_has_a4(fc))
  61                         return NULL;
  62                 if (ieee80211_has_tods(fc))
  63                         return hdr->addr1;
  64                 if (ieee80211_has_fromds(fc))
  65                         return hdr->addr2;
  66
  67                 return hdr->addr3;
  68         }
  69
  70         if (ieee80211_is_mgmt(fc)) {
  71                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  72                         return NULL;
  73                 return hdr->addr3;
  74         }
  75
  76         if (ieee80211_is_ctl(fc)) {
  77                 if(ieee80211_is_pspoll(fc))
  78                         return hdr->addr1;
  79
  80                 if (ieee80211_is_back_req(fc)) {
  81                         switch (type) {
  82                         case NL80211_IFTYPE_STATION:
  83                                 return hdr->addr2;
  84                         case NL80211_IFTYPE_AP:
  85                         case NL80211_IFTYPE_AP_VLAN:
  86                                 return hdr->addr1;
  87                         default:
  88                                 break; /* fall through to the return */
  89                         }
  90                 }
  91         }
  92
  93         return NULL;
  94 }
  95
  96 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  97 {
  98         struct sk_buff *skb = tx->skb;
  99         struct ieee80211_hdr *hdr;
 100
 101         do {
 102                 hdr = (struct ieee80211_hdr *) skb->data;
 103                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 104         } while ((skb = skb->next));
 105 }
 106
 107 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 108                              int rate, int erp, int short_preamble)
 109 {
 110         int dur;
 111
 112         /* calculate duration (in microseconds, rounded up to next higher
 113          * integer if it includes a fractional microsecond) to send frame of
 114          * len bytes (does not include FCS) at the given rate. Duration will
 115          * also include SIFS.
 116          *
 117          * rate is in 100 kbps, so divident is multiplied by 10 in the
 118          * DIV_ROUND_UP() operations.
 119          */
 120
 121         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 122                 /*
 123                  * OFDM:
 124                  *
 125                  * N_DBPS = DATARATE x 4
 126                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 127                  *      (16 = SIGNAL time, 6 = tail bits)
 128                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 129                  *
 130                  * T_SYM = 4 usec
 131                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 132                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 133                  *      signal ext = 6 usec
 134                  */
 135                 dur = 16; /* SIFS + signal ext */
 136                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 137                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 138                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 139                                         4 * rate); /* T_SYM x N_SYM */
 140         } else {
 141                 /*
 142                  * 802.11b or 802.11g with 802.11b compatibility:
 143                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 144                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 145                  *
 146                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 147                  * aSIFSTime = 10 usec
 148                  * aPreambleLength = 144 usec or 72 usec with short preamble
 149                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 150                  */
 151                 dur = 10; /* aSIFSTime = 10 usec */
 152                 dur += short_preamble ? (72 + 24) : (144 + 48);
 153
 154                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 155         }
 156
 157         return dur;
 158 }
 159
 160 /* Exported duration function for driver use */
 161 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 162                                         struct ieee80211_vif *vif,
 163                                         size_t frame_len,
 164                                         struct ieee80211_rate *rate)
 165 {
 166         struct ieee80211_local *local = hw_to_local(hw);
 167         struct ieee80211_sub_if_data *sdata;
 168         u16 dur;
 169         int erp;
 170         bool short_preamble = false;
 171
 172         erp = 0;
 173         if (vif) {
 174                 sdata = vif_to_sdata(vif);
 175                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 176                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 177                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 178         }
 179
 180         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 181                                        short_preamble);
 182
 183         return cpu_to_le16(dur);
 184 }
 185 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 186
 187 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 188                               struct ieee80211_vif *vif, size_t frame_len,
 189                               const struct ieee80211_tx_info *frame_txctl)
 190 {
 191         struct ieee80211_local *local = hw_to_local(hw);
 192         struct ieee80211_rate *rate;
 193         struct ieee80211_sub_if_data *sdata;
 194         bool short_preamble;
 195         int erp;
 196         u16 dur;
 197         struct ieee80211_supported_band *sband;
 198
 199         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 200
 201         short_preamble = false;
 202
 203         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 204
 205         erp = 0;
 206         if (vif) {
 207                 sdata = vif_to_sdata(vif);
 208                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 209                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 210                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 211         }
 212
 213         /* CTS duration */
 214         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 215                                        erp, short_preamble);
 216         /* Data frame duration */
 217         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 218                                         erp, short_preamble);
 219         /* ACK duration */
 220         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 221                                         erp, short_preamble);
 222
 223         return cpu_to_le16(dur);
 224 }
 225 EXPORT_SYMBOL(ieee80211_rts_duration);
 226
 227 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 228                                     struct ieee80211_vif *vif,
 229                                     size_t frame_len,
 230                                     const struct ieee80211_tx_info *frame_txctl)
 231 {
 232         struct ieee80211_local *local = hw_to_local(hw);
 233         struct ieee80211_rate *rate;
 234         struct ieee80211_sub_if_data *sdata;
 235         bool short_preamble;
 236         int erp;
 237         u16 dur;
 238         struct ieee80211_supported_band *sband;
 239
 240         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 241
 242         short_preamble = false;
 243
 244         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 245         erp = 0;
 246         if (vif) {
 247                 sdata = vif_to_sdata(vif);
 248                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 249                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 250                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 251         }
 252
 253         /* Data frame duration */
 254         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 255                                        erp, short_preamble);
 256         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 257                 /* ACK duration */
 258                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 259                                                 erp, short_preamble);
 260         }
 261
 262         return cpu_to_le16(dur);
 263 }
 264 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 265
 266 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 267                                    enum queue_stop_reason reason)
 268 {
 269         struct ieee80211_local *local = hw_to_local(hw);
 270         struct ieee80211_sub_if_data *sdata;
 271
 272         trace_wake_queue(local, queue, reason);
 273
 274         if (WARN_ON(queue >= hw->queues))
 275                 return;
 276
 277         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 278
 279         if (local->queue_stop_reasons[queue] != 0)
 280                 /* someone still has this queue stopped */
 281                 return;
 282
 283         if (skb_queue_empty(&local->pending[queue])) {
 284                 rcu_read_lock();
 285                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 286                         if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 287                                 continue;
 288                         netif_wake_subqueue(sdata->dev, queue);
 289                 }
 290                 rcu_read_unlock();
 291         } else
 292                 tasklet_schedule(&local->tx_pending_tasklet);
 293 }
 294
 295 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 296                                     enum queue_stop_reason reason)
 297 {
 298         struct ieee80211_local *local = hw_to_local(hw);
 299         unsigned long flags;
 300
 301         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 302         __ieee80211_wake_queue(hw, queue, reason);
 303         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 304 }
 305
 306 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 307 {
 308         ieee80211_wake_queue_by_reason(hw, queue,
 309                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 310 }
 311 EXPORT_SYMBOL(ieee80211_wake_queue);
 312
 313 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 314                                    enum queue_stop_reason reason)
 315 {
 316         struct ieee80211_local *local = hw_to_local(hw);
 317         struct ieee80211_sub_if_data *sdata;
 318
 319         trace_stop_queue(local, queue, reason);
 320
 321         if (WARN_ON(queue >= hw->queues))
 322                 return;
 323
 324         __set_bit(reason, &local->queue_stop_reasons[queue]);
 325
 326         rcu_read_lock();
 327         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 328                 netif_stop_subqueue(sdata->dev, queue);
 329         rcu_read_unlock();
 330 }
 331
 332 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 333                                     enum queue_stop_reason reason)
 334 {
 335         struct ieee80211_local *local = hw_to_local(hw);
 336         unsigned long flags;
 337
 338         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 339         __ieee80211_stop_queue(hw, queue, reason);
 340         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 341 }
 342
 343 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 344 {
 345         ieee80211_stop_queue_by_reason(hw, queue,
 346                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 347 }
 348 EXPORT_SYMBOL(ieee80211_stop_queue);
 349
 350 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 351                                struct sk_buff *skb)
 352 {
 353         struct ieee80211_hw *hw = &local->hw;
 354         unsigned long flags;
 355         int queue = skb_get_queue_mapping(skb);
 356         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 357
 358         if (WARN_ON(!info->control.vif)) {
 359                 kfree_skb(skb);
 360                 return;
 361         }
 362
 363         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 364         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 365         __skb_queue_tail(&local->pending[queue], skb);
 366         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 367         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 368 }
 369
 370 int ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 371                                   struct sk_buff_head *skbs,
 372                                   void (*fn)(void *data), void *data)
 373 {
 374         struct ieee80211_hw *hw = &local->hw;
 375         struct sk_buff *skb;
 376         unsigned long flags;
 377         int queue, ret = 0, i;
 378
 379         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 380         for (i = 0; i < hw->queues; i++)
 381                 __ieee80211_stop_queue(hw, i,
 382                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 383
 384         while ((skb = skb_dequeue(skbs))) {
 385                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 386
 387                 if (WARN_ON(!info->control.vif)) {
 388                         kfree_skb(skb);
 389                         continue;
 390                 }
 391
 392                 ret++;
 393                 queue = skb_get_queue_mapping(skb);
 394                 __skb_queue_tail(&local->pending[queue], skb);
 395         }
 396
 397         if (fn)
 398                 fn(data);
 399
 400         for (i = 0; i < hw->queues; i++)
 401                 __ieee80211_wake_queue(hw, i,
 402                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 403         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 404
 405         return ret;
 406 }
 407
 408 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 409                                struct sk_buff_head *skbs)
 410 {
 411         return ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
 412 }
 413
 414 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 415                                     enum queue_stop_reason reason)
 416 {
 417         struct ieee80211_local *local = hw_to_local(hw);
 418         unsigned long flags;
 419         int i;
 420
 421         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 422
 423         for (i = 0; i < hw->queues; i++)
 424                 __ieee80211_stop_queue(hw, i, reason);
 425
 426         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 427 }
 428
 429 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 430 {
 431         ieee80211_stop_queues_by_reason(hw,
 432                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 433 }
 434 EXPORT_SYMBOL(ieee80211_stop_queues);
 435
 436 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 437 {
 438         struct ieee80211_local *local = hw_to_local(hw);
 439         unsigned long flags;
 440         int ret;
 441
 442         if (WARN_ON(queue >= hw->queues))
 443                 return true;
 444
 445         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 446         ret = !!local->queue_stop_reasons[queue];
 447         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 448         return ret;
 449 }
 450 EXPORT_SYMBOL(ieee80211_queue_stopped);
 451
 452 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 453                                      enum queue_stop_reason reason)
 454 {
 455         struct ieee80211_local *local = hw_to_local(hw);
 456         unsigned long flags;
 457         int i;
 458
 459         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 460
 461         for (i = 0; i < hw->queues; i++)
 462                 __ieee80211_wake_queue(hw, i, reason);
 463
 464         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 465 }
 466
 467 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 468 {
 469         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 470 }
 471 EXPORT_SYMBOL(ieee80211_wake_queues);
 472
 473 void ieee80211_iterate_active_interfaces(
 474         struct ieee80211_hw *hw,
 475         void (*iterator)(void *data, u8 *mac,
 476                          struct ieee80211_vif *vif),
 477         void *data)
 478 {
 479         struct ieee80211_local *local = hw_to_local(hw);
 480         struct ieee80211_sub_if_data *sdata;
 481
 482         mutex_lock(&local->iflist_mtx);
 483
 484         list_for_each_entry(sdata, &local->interfaces, list) {
 485                 switch (sdata->vif.type) {
 486                 case NL80211_IFTYPE_MONITOR:
 487                 case NL80211_IFTYPE_AP_VLAN:
 488                         continue;
 489                 default:
 490                         break;
 491                 }
 492                 if (ieee80211_sdata_running(sdata))
 493                         iterator(data, sdata->vif.addr,
 494                                  &sdata->vif);
 495         }
 496
 497         mutex_unlock(&local->iflist_mtx);
 498 }
 499 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 500
 501 void ieee80211_iterate_active_interfaces_atomic(
 502         struct ieee80211_hw *hw,
 503         void (*iterator)(void *data, u8 *mac,
 504                          struct ieee80211_vif *vif),
 505         void *data)
 506 {
 507         struct ieee80211_local *local = hw_to_local(hw);
 508         struct ieee80211_sub_if_data *sdata;
 509
 510         rcu_read_lock();
 511
 512         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 513                 switch (sdata->vif.type) {
 514                 case NL80211_IFTYPE_MONITOR:
 515                 case NL80211_IFTYPE_AP_VLAN:
 516                         continue;
 517                 default:
 518                         break;
 519                 }
 520                 if (ieee80211_sdata_running(sdata))
 521                         iterator(data, sdata->vif.addr,
 522                                  &sdata->vif);
 523         }
 524
 525         rcu_read_unlock();
 526 }
 527 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 528
 529 /*
 530  * Nothing should have been stuffed into the workqueue during
 531  * the suspend->resume cycle. If this WARN is seen then there
 532  * is a bug with either the driver suspend or something in
 533  * mac80211 stuffing into the workqueue which we haven't yet
 534  * cleared during mac80211's suspend cycle.
 535  */
 536 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 537 {
 538         if (WARN(local->suspended && !local->resuming,
 539                  "queueing ieee80211 work while going to suspend\n"))
 540                 return false;
 541
 542         return true;
 543 }
 544
 545 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 546 {
 547         struct ieee80211_local *local = hw_to_local(hw);
 548
 549         if (!ieee80211_can_queue_work(local))
 550                 return;
 551
 552         queue_work(local->workqueue, work);
 553 }
 554 EXPORT_SYMBOL(ieee80211_queue_work);
 555
 556 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 557                                   struct delayed_work *dwork,
 558                                   unsigned long delay)
 559 {
 560         struct ieee80211_local *local = hw_to_local(hw);
 561
 562         if (!ieee80211_can_queue_work(local))
 563                 return;
 564
 565         queue_delayed_work(local->workqueue, dwork, delay);
 566 }
 567 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 568
 569 void ieee802_11_parse_elems(u8 *start, size_t len,
 570                             struct ieee802_11_elems *elems)
 571 {
 572         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 573 }
 574
 575 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 576 {
 577         struct ieee80211_local *local = sdata->local;
 578         struct ieee80211_tx_queue_params qparam;
 579         int queue;
 580         bool use_11b;
 581         int aCWmin, aCWmax;
 582
 583         if (!local->ops->conf_tx)
 584                 return;
 585
 586         memset(&qparam, 0, sizeof(qparam));
 587
 588         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 589                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 590
 591         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 592                 /* Set defaults according to 802.11-2007 Table 7-37 */
 593                 aCWmax = 1023;
 594                 if (use_11b)
 595                         aCWmin = 31;
 596                 else
 597                         aCWmin = 15;
 598
 599                 switch (queue) {
 600                 case 3: /* AC_BK */
 601                         qparam.cw_max = aCWmax;
 602                         qparam.cw_min = aCWmin;
 603                         qparam.txop = 0;
 604                         qparam.aifs = 7;
 605                         break;
 606                 default: /* never happens but let's not leave undefined */
 607                 case 2: /* AC_BE */
 608                         qparam.cw_max = aCWmax;
 609                         qparam.cw_min = aCWmin;
 610                         qparam.txop = 0;
 611                         qparam.aifs = 3;
 612                         break;
 613                 case 1: /* AC_VI */
 614                         qparam.cw_max = aCWmin;
 615                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 616                         if (use_11b)
 617                                 qparam.txop = 6016/32;
 618                         else
 619                                 qparam.txop = 3008/32;
 620                         qparam.aifs = 2;
 621                         break;
 622                 case 0: /* AC_VO */
 623                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 624                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 625                         if (use_11b)
 626                                 qparam.txop = 3264/32;
 627                         else
 628                                 qparam.txop = 1504/32;
 629                         qparam.aifs = 2;
 630                         break;
 631                 }
 632
 633                 qparam.uapsd = false;
 634
 635                 local->tx_conf[queue] = qparam;
 636                 drv_conf_tx(local, queue, &qparam);
 637         }
 638
 639         /* after reinitialize QoS TX queues setting to default,
 640          * disable QoS at all */
 641
 642         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 643                 sdata->vif.bss_conf.qos =
 644                         sdata->vif.type != NL80211_IFTYPE_STATION;
 645                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 646         }
 647 }
 648
 649 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 650                                   const size_t supp_rates_len,
 651                                   const u8 *supp_rates)
 652 {
 653         struct ieee80211_local *local = sdata->local;
 654         int i, have_higher_than_11mbit = 0;
 655
 656         /* cf. IEEE 802.11 9.2.12 */
 657         for (i = 0; i < supp_rates_len; i++)
 658                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 659                         have_higher_than_11mbit = 1;
 660
 661         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 662             have_higher_than_11mbit)
 663                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 664         else
 665                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 666
 667         ieee80211_set_wmm_default(sdata);
 668 }
 669
 670 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 671                               enum ieee80211_band band)
 672 {
 673         struct ieee80211_supported_band *sband;
 674         struct ieee80211_rate *bitrates;
 675         u32 mandatory_rates;
 676         enum ieee80211_rate_flags mandatory_flag;
 677         int i;
 678
 679         sband = local->hw.wiphy->bands[band];
 680         if (!sband) {
 681                 WARN_ON(1);
 682                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 683         }
 684
 685         if (band == IEEE80211_BAND_2GHZ)
 686                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 687         else
 688                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 689
 690         bitrates = sband->bitrates;
 691         mandatory_rates = 0;
 692         for (i = 0; i < sband->n_bitrates; i++)
 693                 if (bitrates[i].flags & mandatory_flag)
 694                         mandatory_rates |= BIT(i);
 695         return mandatory_rates;
 696 }
 697
 698 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 699                          u16 transaction, u16 auth_alg,
 700                          u8 *extra, size_t extra_len, const u8 *bssid,
 701                          const u8 *key, u8 key_len, u8 key_idx)
 702 {
 703         struct ieee80211_local *local = sdata->local;
 704         struct sk_buff *skb;
 705         struct ieee80211_mgmt *mgmt;
 706         int err;
 707
 708         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 709                             sizeof(*mgmt) + 6 + extra_len);
 710         if (!skb) {
 711                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 712                        "frame\n", sdata->name);
 713                 return;
 714         }
 715         skb_reserve(skb, local->hw.extra_tx_headroom);
 716
 717         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 718         memset(mgmt, 0, 24 + 6);
 719         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 720                                           IEEE80211_STYPE_AUTH);
 721         memcpy(mgmt->da, bssid, ETH_ALEN);
 722         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 723         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 724         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 725         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 726         mgmt->u.auth.status_code = cpu_to_le16(0);
 727         if (extra)
 728                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 729
 730         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 731                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 732                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 733                 WARN_ON(err);
 734         }
 735
 736         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 737         ieee80211_tx_skb(sdata, skb);
 738 }
 739
 740 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 741                              const u8 *ie, size_t ie_len,
 742                              enum ieee80211_band band, u32 rate_mask,
 743                              u8 channel)
 744 {
 745         struct ieee80211_supported_band *sband;
 746         u8 *pos;
 747         size_t offset = 0, noffset;
 748         int supp_rates_len, i;
 749         u8 rates[32];
 750         int num_rates;
 751         int ext_rates_len;
 752
 753         sband = local->hw.wiphy->bands[band];
 754
 755         pos = buffer;
 756
 757         num_rates = 0;
 758         for (i = 0; i < sband->n_bitrates; i++) {
 759                 if ((BIT(i) & rate_mask) == 0)
 760                         continue; /* skip rate */
 761                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
 762         }
 763
 764         supp_rates_len = min_t(int, num_rates, 8);
 765
 766         *pos++ = WLAN_EID_SUPP_RATES;
 767         *pos++ = supp_rates_len;
 768         memcpy(pos, rates, supp_rates_len);
 769         pos += supp_rates_len;
 770
 771         /* insert "request information" if in custom IEs */
 772         if (ie && ie_len) {
 773                 static const u8 before_extrates[] = {
 774                         WLAN_EID_SSID,
 775                         WLAN_EID_SUPP_RATES,
 776                         WLAN_EID_REQUEST,
 777                 };
 778                 noffset = ieee80211_ie_split(ie, ie_len,
 779                                              before_extrates,
 780                                              ARRAY_SIZE(before_extrates),
 781                                              offset);
 782                 memcpy(pos, ie + offset, noffset - offset);
 783                 pos += noffset - offset;
 784                 offset = noffset;
 785         }
 786
 787         ext_rates_len = num_rates - supp_rates_len;
 788         if (ext_rates_len > 0) {
 789                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 790                 *pos++ = ext_rates_len;
 791                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
 792                 pos += ext_rates_len;
 793         }
 794
 795         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
 796                 *pos++ = WLAN_EID_DS_PARAMS;
 797                 *pos++ = 1;
 798                 *pos++ = channel;
 799         }
 800
 801         /* insert custom IEs that go before HT */
 802         if (ie && ie_len) {
 803                 static const u8 before_ht[] = {
 804                         WLAN_EID_SSID,
 805                         WLAN_EID_SUPP_RATES,
 806                         WLAN_EID_REQUEST,
 807                         WLAN_EID_EXT_SUPP_RATES,
 808                         WLAN_EID_DS_PARAMS,
 809                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 810                 };
 811                 noffset = ieee80211_ie_split(ie, ie_len,
 812                                              before_ht, ARRAY_SIZE(before_ht),
 813                                              offset);
 814                 memcpy(pos, ie + offset, noffset - offset);
 815                 pos += noffset - offset;
 816                 offset = noffset;
 817         }
 818
 819         if (sband->ht_cap.ht_supported) {
 820                 u16 cap = sband->ht_cap.cap;
 821                 __le16 tmp;
 822
 823                 *pos++ = WLAN_EID_HT_CAPABILITY;
 824                 *pos++ = sizeof(struct ieee80211_ht_cap);
 825                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 826                 tmp = cpu_to_le16(cap);
 827                 memcpy(pos, &tmp, sizeof(u16));
 828                 pos += sizeof(u16);
 829                 *pos++ = sband->ht_cap.ampdu_factor |
 830                          (sband->ht_cap.ampdu_density <<
 831                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
 832                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 833                 pos += sizeof(sband->ht_cap.mcs);
 834                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 835         }
 836
 837         /*
 838          * If adding more here, adjust code in main.c
 839          * that calculates local->scan_ies_len.
 840          */
 841
 842         /* add any remaining custom IEs */
 843         if (ie && ie_len) {
 844                 noffset = ie_len;
 845                 memcpy(pos, ie + offset, noffset - offset);
 846                 pos += noffset - offset;
 847         }
 848
 849         return pos - buffer;
 850 }
 851
 852 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
 853                                           u8 *dst, u32 ratemask,
 854                                           const u8 *ssid, size_t ssid_len,
 855                                           const u8 *ie, size_t ie_len,
 856                                           bool directed)
 857 {
 858         struct ieee80211_local *local = sdata->local;
 859         struct sk_buff *skb;
 860         struct ieee80211_mgmt *mgmt;
 861         size_t buf_len;
 862         u8 *buf;
 863         u8 chan;
 864
 865         /* FIXME: come up with a proper value */
 866         buf = kmalloc(200 + ie_len, GFP_KERNEL);
 867         if (!buf) {
 868                 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
 869                        "buffer\n", sdata->name);
 870                 return NULL;
 871         }
 872
 873         /*
 874          * Do not send DS Channel parameter for directed probe requests
 875          * in order to maximize the chance that we get a response.  Some
 876          * badly-behaved APs don't respond when this parameter is included.
 877          */
 878         if (directed)
 879                 chan = 0;
 880         else
 881                 chan = ieee80211_frequency_to_channel(
 882                         local->hw.conf.channel->center_freq);
 883
 884         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
 885                                            local->hw.conf.channel->band,
 886                                            ratemask, chan);
 887
 888         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
 889                                      ssid, ssid_len,
 890                                      buf, buf_len);
 891
 892         if (dst) {
 893                 mgmt = (struct ieee80211_mgmt *) skb->data;
 894                 memcpy(mgmt->da, dst, ETH_ALEN);
 895                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 896         }
 897
 898         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 899         kfree(buf);
 900
 901         return skb;
 902 }
 903
 904 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 905                               const u8 *ssid, size_t ssid_len,
 906                               const u8 *ie, size_t ie_len,
 907                               u32 ratemask, bool directed)
 908 {
 909         struct sk_buff *skb;
 910
 911         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
 912                                         ie, ie_len, directed);
 913         if (skb)
 914                 ieee80211_tx_skb(sdata, skb);
 915 }
 916
 917 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 918                             struct ieee802_11_elems *elems,
 919                             enum ieee80211_band band)
 920 {
 921         struct ieee80211_supported_band *sband;
 922         struct ieee80211_rate *bitrates;
 923         size_t num_rates;
 924         u32 supp_rates;
 925         int i, j;
 926         sband = local->hw.wiphy->bands[band];
 927
 928         if (!sband) {
 929                 WARN_ON(1);
 930                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 931         }
 932
 933         bitrates = sband->bitrates;
 934         num_rates = sband->n_bitrates;
 935         supp_rates = 0;
 936         for (i = 0; i < elems->supp_rates_len +
 937                      elems->ext_supp_rates_len; i++) {
 938                 u8 rate = 0;
 939                 int own_rate;
 940                 if (i < elems->supp_rates_len)
 941                         rate = elems->supp_rates[i];
 942                 else if (elems->ext_supp_rates)
 943                         rate = elems->ext_supp_rates
 944                                 [i - elems->supp_rates_len];
 945                 own_rate = 5 * (rate & 0x7f);
 946                 for (j = 0; j < num_rates; j++)
 947                         if (bitrates[j].bitrate == own_rate)
 948                                 supp_rates |= BIT(j);
 949         }
 950         return supp_rates;
 951 }
 952
 953 void ieee80211_stop_device(struct ieee80211_local *local)
 954 {
 955         ieee80211_led_radio(local, false);
 956         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
 957
 958         cancel_work_sync(&local->reconfig_filter);
 959
 960         flush_workqueue(local->workqueue);
 961         drv_stop(local);
 962 }
 963
 964 int ieee80211_reconfig(struct ieee80211_local *local)
 965 {
 966         struct ieee80211_hw *hw = &local->hw;
 967         struct ieee80211_sub_if_data *sdata;
 968         struct sta_info *sta;
 969         int res, i;
 970
 971 #ifdef CONFIG_PM
 972         if (local->suspended)
 973                 local->resuming = true;
 974
 975         if (local->wowlan) {
 976                 local->wowlan = false;
 977                 res = drv_resume(local);
 978                 if (res < 0) {
 979                         local->resuming = false;
 980                         return res;
 981                 }
 982                 if (res == 0)
 983                         goto wake_up;
 984                 WARN_ON(res > 1);
 985                 /*
 986                  * res is 1, which means the driver requested
 987                  * to go through a regular reset on wakeup.
 988                  */
 989         }
 990 #endif
 991
 992         /* setup fragmentation threshold */
 993         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
 994
 995         /* setup RTS threshold */
 996         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
 997
 998         /* reset coverage class */
 999         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1000
1001         /* everything else happens only if HW was up & running */
1002         if (!local->open_count)
1003                 goto wake_up;
1004
1005         /*
1006          * Upon resume hardware can sometimes be goofy due to
1007          * various platform / driver / bus issues, so restarting
1008          * the device may at times not work immediately. Propagate
1009          * the error.
1010          */
1011         res = drv_start(local);
1012         if (res) {
1013                 WARN(local->suspended, "Hardware became unavailable "
1014                      "upon resume. This could be a software issue "
1015                      "prior to suspend or a hardware issue.\n");
1016                 return res;
1017         }
1018
1019         ieee80211_led_radio(local, true);
1020         ieee80211_mod_tpt_led_trig(local,
1021                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1022
1023         /* add interfaces */
1024         list_for_each_entry(sdata, &local->interfaces, list) {
1025                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1026                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1027                     ieee80211_sdata_running(sdata))
1028                         res = drv_add_interface(local, &sdata->vif);
1029         }
1030
1031         /* add STAs back */
1032         mutex_lock(&local->sta_mtx);
1033         list_for_each_entry(sta, &local->sta_list, list) {
1034                 if (sta->uploaded) {
1035                         sdata = sta->sdata;
1036                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1037                                 sdata = container_of(sdata->bss,
1038                                              struct ieee80211_sub_if_data,
1039                                              u.ap);
1040
1041                         memset(&sta->sta.drv_priv, 0, hw->sta_data_size);
1042                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1043                 }
1044         }
1045         mutex_unlock(&local->sta_mtx);
1046
1047         /* reconfigure tx conf */
1048         for (i = 0; i < hw->queues; i++)
1049                 drv_conf_tx(local, i, &local->tx_conf[i]);
1050
1051         /* reconfigure hardware */
1052         ieee80211_hw_config(local, ~0);
1053
1054         ieee80211_configure_filter(local);
1055
1056         /* Finally also reconfigure all the BSS information */
1057         list_for_each_entry(sdata, &local->interfaces, list) {
1058                 u32 changed;
1059
1060                 if (!ieee80211_sdata_running(sdata))
1061                         continue;
1062
1063                 /* common change flags for all interface types */
1064                 changed = BSS_CHANGED_ERP_CTS_PROT |
1065                           BSS_CHANGED_ERP_PREAMBLE |
1066                           BSS_CHANGED_ERP_SLOT |
1067                           BSS_CHANGED_HT |
1068                           BSS_CHANGED_BASIC_RATES |
1069                           BSS_CHANGED_BEACON_INT |
1070                           BSS_CHANGED_BSSID |
1071                           BSS_CHANGED_CQM |
1072                           BSS_CHANGED_QOS;
1073
1074                 switch (sdata->vif.type) {
1075                 case NL80211_IFTYPE_STATION:
1076                         changed |= BSS_CHANGED_ASSOC;
1077                         mutex_lock(&sdata->u.mgd.mtx);
1078                         ieee80211_bss_info_change_notify(sdata, changed);
1079                         mutex_unlock(&sdata->u.mgd.mtx);
1080                         break;
1081                 case NL80211_IFTYPE_ADHOC:
1082                         changed |= BSS_CHANGED_IBSS;
1083                         /* fall through */
1084                 case NL80211_IFTYPE_AP:
1085                 case NL80211_IFTYPE_MESH_POINT:
1086                         changed |= BSS_CHANGED_BEACON |
1087                                    BSS_CHANGED_BEACON_ENABLED;
1088                         ieee80211_bss_info_change_notify(sdata, changed);
1089                         break;
1090                 case NL80211_IFTYPE_WDS:
1091                         break;
1092                 case NL80211_IFTYPE_AP_VLAN:
1093                 case NL80211_IFTYPE_MONITOR:
1094                         /* ignore virtual */
1095                         break;
1096                 case NL80211_IFTYPE_UNSPECIFIED:
1097                 case NUM_NL80211_IFTYPES:
1098                 case NL80211_IFTYPE_P2P_CLIENT:
1099                 case NL80211_IFTYPE_P2P_GO:
1100                         WARN_ON(1);
1101                         break;
1102                 }
1103         }
1104
1105         /*
1106          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1107          * sessions can be established after a resume.
1108          *
1109          * Also tear down aggregation sessions since reconfiguring
1110          * them in a hardware restart scenario is not easily done
1111          * right now, and the hardware will have lost information
1112          * about the sessions, but we and the AP still think they
1113          * are active. This is really a workaround though.
1114          */
1115         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1116                 mutex_lock(&local->sta_mtx);
1117
1118                 list_for_each_entry(sta, &local->sta_list, list) {
1119                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1120                         clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1121                 }
1122
1123                 mutex_unlock(&local->sta_mtx);
1124         }
1125
1126         /* add back keys */
1127         list_for_each_entry(sdata, &local->interfaces, list)
1128                 if (ieee80211_sdata_running(sdata))
1129                         ieee80211_enable_keys(sdata);
1130
1131  wake_up:
1132         ieee80211_wake_queues_by_reason(hw,
1133                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1134
1135         /*
1136          * If this is for hw restart things are still running.
1137          * We may want to change that later, however.
1138          */
1139         if (!local->suspended)
1140                 return 0;
1141
1142 #ifdef CONFIG_PM
1143         /* first set suspended false, then resuming */
1144         local->suspended = false;
1145         mb();
1146         local->resuming = false;
1147
1148         list_for_each_entry(sdata, &local->interfaces, list) {
1149                 switch(sdata->vif.type) {
1150                 case NL80211_IFTYPE_STATION:
1151                         ieee80211_sta_restart(sdata);
1152                         break;
1153                 case NL80211_IFTYPE_ADHOC:
1154                         ieee80211_ibss_restart(sdata);
1155                         break;
1156                 case NL80211_IFTYPE_MESH_POINT:
1157                         ieee80211_mesh_restart(sdata);
1158                         break;
1159                 default:
1160                         break;
1161                 }
1162         }
1163
1164         mod_timer(&local->sta_cleanup, jiffies + 1);
1165
1166         mutex_lock(&local->sta_mtx);
1167         list_for_each_entry(sta, &local->sta_list, list)
1168                 mesh_plink_restart(sta);
1169         mutex_unlock(&local->sta_mtx);
1170 #else
1171         WARN_ON(1);
1172 #endif
1173         return 0;
1174 }
1175
1176 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1177 {
1178         struct ieee80211_sub_if_data *sdata;
1179         struct ieee80211_local *local;
1180         struct ieee80211_key *key;
1181
1182         if (WARN_ON(!vif))
1183                 return;
1184
1185         sdata = vif_to_sdata(vif);
1186         local = sdata->local;
1187
1188         if (WARN_ON(!local->resuming))
1189                 return;
1190
1191         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1192                 return;
1193
1194         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1195
1196         mutex_lock(&local->key_mtx);
1197         list_for_each_entry(key, &sdata->key_list, list)
1198                 key->flags |= KEY_FLAG_TAINTED;
1199         mutex_unlock(&local->key_mtx);
1200 }
1201 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1202
1203 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1204                           enum ieee80211_smps_mode *smps_mode)
1205 {
1206         if (ifmgd->associated) {
1207                 *smps_mode = ifmgd->ap_smps;
1208
1209                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1210                         if (ifmgd->powersave)
1211                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1212                         else
1213                                 *smps_mode = IEEE80211_SMPS_OFF;
1214                 }
1215
1216                 return 1;
1217         }
1218
1219         return 0;
1220 }
1221
1222 /* must hold iflist_mtx */
1223 void ieee80211_recalc_smps(struct ieee80211_local *local)
1224 {
1225         struct ieee80211_sub_if_data *sdata;
1226         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1227         int count = 0;
1228
1229         lockdep_assert_held(&local->iflist_mtx);
1230
1231         /*
1232          * This function could be improved to handle multiple
1233          * interfaces better, but right now it makes any
1234          * non-station interfaces force SM PS to be turned
1235          * off. If there are multiple station interfaces it
1236          * could also use the best possible mode, e.g. if
1237          * one is in static and the other in dynamic then
1238          * dynamic is ok.
1239          */
1240
1241         list_for_each_entry(sdata, &local->interfaces, list) {
1242                 if (!ieee80211_sdata_running(sdata))
1243                         continue;
1244                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1245                         goto set;
1246
1247                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1248
1249                 if (count > 1) {
1250                         smps_mode = IEEE80211_SMPS_OFF;
1251                         break;
1252                 }
1253         }
1254
1255         if (smps_mode == local->smps_mode)
1256                 return;
1257
1258  set:
1259         local->smps_mode = smps_mode;
1260         /* changed flag is auto-detected for this */
1261         ieee80211_hw_config(local, 0);
1262 }
1263
1264 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1265 {
1266         int i;
1267
1268         for (i = 0; i < n_ids; i++)
1269                 if (ids[i] == id)
1270                         return true;
1271         return false;
1272 }
1273
1274 /**
1275  * ieee80211_ie_split - split an IE buffer according to ordering
1276  *
1277  * @ies: the IE buffer
1278  * @ielen: the length of the IE buffer
1279  * @ids: an array with element IDs that are allowed before
1280  *      the split
1281  * @n_ids: the size of the element ID array
1282  * @offset: offset where to start splitting in the buffer
1283  *
1284  * This function splits an IE buffer by updating the @offset
1285  * variable to point to the location where the buffer should be
1286  * split.
1287  *
1288  * It assumes that the given IE buffer is well-formed, this
1289  * has to be guaranteed by the caller!
1290  *
1291  * It also assumes that the IEs in the buffer are ordered
1292  * correctly, if not the result of using this function will not
1293  * be ordered correctly either, i.e. it does no reordering.
1294  *
1295  * The function returns the offset where the next part of the
1296  * buffer starts, which may be @ielen if the entire (remainder)
1297  * of the buffer should be used.
1298  */
1299 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1300                           const u8 *ids, int n_ids, size_t offset)
1301 {
1302         size_t pos = offset;
1303
1304         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1305                 pos += 2 + ies[pos + 1];
1306
1307         return pos;
1308 }
1309
1310 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1311 {
1312         size_t pos = offset;
1313
1314         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1315                 pos += 2 + ies[pos + 1];
1316
1317         return pos;
1318 }
1319
1320 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1321                                             int rssi_min_thold,
1322                                             int rssi_max_thold)
1323 {
1324         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1325
1326         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1327                 return;
1328
1329         /*
1330          * Scale up threshold values before storing it, as the RSSI averaging
1331          * algorithm uses a scaled up value as well. Change this scaling
1332          * factor if the RSSI averaging algorithm changes.
1333          */
1334         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1335         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1336 }
1337
1338 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1339                                     int rssi_min_thold,
1340                                     int rssi_max_thold)
1341 {
1342         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1343
1344         WARN_ON(rssi_min_thold == rssi_max_thold ||
1345                 rssi_min_thold > rssi_max_thold);
1346
1347         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1348                                        rssi_max_thold);
1349 }
1350 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1351
1352 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1353 {
1354         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1355
1356         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1357 }
1358 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);