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 void 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, 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                 queue = skb_get_queue_mapping(skb);
 393                 __skb_queue_tail(&local->pending[queue], skb);
 394         }
 395
 396         if (fn)
 397                 fn(data);
 398
 399         for (i = 0; i < hw->queues; i++)
 400                 __ieee80211_wake_queue(hw, i,
 401                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 402         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 403 }
 404
 405 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 406                                 struct sk_buff_head *skbs)
 407 {
 408         ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
 409 }
 410
 411 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 412                                     enum queue_stop_reason reason)
 413 {
 414         struct ieee80211_local *local = hw_to_local(hw);
 415         unsigned long flags;
 416         int i;
 417
 418         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 419
 420         for (i = 0; i < hw->queues; i++)
 421                 __ieee80211_stop_queue(hw, i, reason);
 422
 423         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 424 }
 425
 426 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 427 {
 428         ieee80211_stop_queues_by_reason(hw,
 429                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 430 }
 431 EXPORT_SYMBOL(ieee80211_stop_queues);
 432
 433 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 434 {
 435         struct ieee80211_local *local = hw_to_local(hw);
 436         unsigned long flags;
 437         int ret;
 438
 439         if (WARN_ON(queue >= hw->queues))
 440                 return true;
 441
 442         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 443         ret = !!local->queue_stop_reasons[queue];
 444         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 445         return ret;
 446 }
 447 EXPORT_SYMBOL(ieee80211_queue_stopped);
 448
 449 void ieee80211_wake_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_wake_queue(hw, i, reason);
 460
 461         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 462 }
 463
 464 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 465 {
 466         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 467 }
 468 EXPORT_SYMBOL(ieee80211_wake_queues);
 469
 470 void ieee80211_iterate_active_interfaces(
 471         struct ieee80211_hw *hw,
 472         void (*iterator)(void *data, u8 *mac,
 473                          struct ieee80211_vif *vif),
 474         void *data)
 475 {
 476         struct ieee80211_local *local = hw_to_local(hw);
 477         struct ieee80211_sub_if_data *sdata;
 478
 479         mutex_lock(&local->iflist_mtx);
 480
 481         list_for_each_entry(sdata, &local->interfaces, list) {
 482                 switch (sdata->vif.type) {
 483                 case NL80211_IFTYPE_MONITOR:
 484                 case NL80211_IFTYPE_AP_VLAN:
 485                         continue;
 486                 default:
 487                         break;
 488                 }
 489                 if (ieee80211_sdata_running(sdata))
 490                         iterator(data, sdata->vif.addr,
 491                                  &sdata->vif);
 492         }
 493
 494         mutex_unlock(&local->iflist_mtx);
 495 }
 496 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 497
 498 void ieee80211_iterate_active_interfaces_atomic(
 499         struct ieee80211_hw *hw,
 500         void (*iterator)(void *data, u8 *mac,
 501                          struct ieee80211_vif *vif),
 502         void *data)
 503 {
 504         struct ieee80211_local *local = hw_to_local(hw);
 505         struct ieee80211_sub_if_data *sdata;
 506
 507         rcu_read_lock();
 508
 509         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 510                 switch (sdata->vif.type) {
 511                 case NL80211_IFTYPE_MONITOR:
 512                 case NL80211_IFTYPE_AP_VLAN:
 513                         continue;
 514                 default:
 515                         break;
 516                 }
 517                 if (ieee80211_sdata_running(sdata))
 518                         iterator(data, sdata->vif.addr,
 519                                  &sdata->vif);
 520         }
 521
 522         rcu_read_unlock();
 523 }
 524 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 525
 526 /*
 527  * Nothing should have been stuffed into the workqueue during
 528  * the suspend->resume cycle. If this WARN is seen then there
 529  * is a bug with either the driver suspend or something in
 530  * mac80211 stuffing into the workqueue which we haven't yet
 531  * cleared during mac80211's suspend cycle.
 532  */
 533 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 534 {
 535         if (WARN(local->suspended && !local->resuming,
 536                  "queueing ieee80211 work while going to suspend\n"))
 537                 return false;
 538
 539         return true;
 540 }
 541
 542 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 543 {
 544         struct ieee80211_local *local = hw_to_local(hw);
 545
 546         if (!ieee80211_can_queue_work(local))
 547                 return;
 548
 549         queue_work(local->workqueue, work);
 550 }
 551 EXPORT_SYMBOL(ieee80211_queue_work);
 552
 553 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 554                                   struct delayed_work *dwork,
 555                                   unsigned long delay)
 556 {
 557         struct ieee80211_local *local = hw_to_local(hw);
 558
 559         if (!ieee80211_can_queue_work(local))
 560                 return;
 561
 562         queue_delayed_work(local->workqueue, dwork, delay);
 563 }
 564 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 565
 566 void ieee802_11_parse_elems(u8 *start, size_t len,
 567                             struct ieee802_11_elems *elems)
 568 {
 569         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 570 }
 571
 572 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 573 {
 574         struct ieee80211_local *local = sdata->local;
 575         struct ieee80211_tx_queue_params qparam;
 576         int queue;
 577         bool use_11b;
 578         int aCWmin, aCWmax;
 579
 580         if (!local->ops->conf_tx)
 581                 return;
 582
 583         memset(&qparam, 0, sizeof(qparam));
 584
 585         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 586                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 587
 588         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 589                 /* Set defaults according to 802.11-2007 Table 7-37 */
 590                 aCWmax = 1023;
 591                 if (use_11b)
 592                         aCWmin = 31;
 593                 else
 594                         aCWmin = 15;
 595
 596                 switch (queue) {
 597                 case 3: /* AC_BK */
 598                         qparam.cw_max = aCWmax;
 599                         qparam.cw_min = aCWmin;
 600                         qparam.txop = 0;
 601                         qparam.aifs = 7;
 602                         break;
 603                 default: /* never happens but let's not leave undefined */
 604                 case 2: /* AC_BE */
 605                         qparam.cw_max = aCWmax;
 606                         qparam.cw_min = aCWmin;
 607                         qparam.txop = 0;
 608                         qparam.aifs = 3;
 609                         break;
 610                 case 1: /* AC_VI */
 611                         qparam.cw_max = aCWmin;
 612                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 613                         if (use_11b)
 614                                 qparam.txop = 6016/32;
 615                         else
 616                                 qparam.txop = 3008/32;
 617                         qparam.aifs = 2;
 618                         break;
 619                 case 0: /* AC_VO */
 620                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 621                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 622                         if (use_11b)
 623                                 qparam.txop = 3264/32;
 624                         else
 625                                 qparam.txop = 1504/32;
 626                         qparam.aifs = 2;
 627                         break;
 628                 }
 629
 630                 qparam.uapsd = false;
 631
 632                 sdata->tx_conf[queue] = qparam;
 633                 drv_conf_tx(local, sdata, queue, &qparam);
 634         }
 635
 636         /* after reinitialize QoS TX queues setting to default,
 637          * disable QoS at all */
 638
 639         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 640                 sdata->vif.bss_conf.qos =
 641                         sdata->vif.type != NL80211_IFTYPE_STATION;
 642                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 643         }
 644 }
 645
 646 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 647                                   const size_t supp_rates_len,
 648                                   const u8 *supp_rates)
 649 {
 650         struct ieee80211_local *local = sdata->local;
 651         int i, have_higher_than_11mbit = 0;
 652
 653         /* cf. IEEE 802.11 9.2.12 */
 654         for (i = 0; i < supp_rates_len; i++)
 655                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 656                         have_higher_than_11mbit = 1;
 657
 658         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 659             have_higher_than_11mbit)
 660                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 661         else
 662                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 663
 664         ieee80211_set_wmm_default(sdata);
 665 }
 666
 667 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 668                               enum ieee80211_band band)
 669 {
 670         struct ieee80211_supported_band *sband;
 671         struct ieee80211_rate *bitrates;
 672         u32 mandatory_rates;
 673         enum ieee80211_rate_flags mandatory_flag;
 674         int i;
 675
 676         sband = local->hw.wiphy->bands[band];
 677         if (!sband) {
 678                 WARN_ON(1);
 679                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 680         }
 681
 682         if (band == IEEE80211_BAND_2GHZ)
 683                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 684         else
 685                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 686
 687         bitrates = sband->bitrates;
 688         mandatory_rates = 0;
 689         for (i = 0; i < sband->n_bitrates; i++)
 690                 if (bitrates[i].flags & mandatory_flag)
 691                         mandatory_rates |= BIT(i);
 692         return mandatory_rates;
 693 }
 694
 695 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 696                          u16 transaction, u16 auth_alg,
 697                          u8 *extra, size_t extra_len, const u8 *bssid,
 698                          const u8 *key, u8 key_len, u8 key_idx)
 699 {
 700         struct ieee80211_local *local = sdata->local;
 701         struct sk_buff *skb;
 702         struct ieee80211_mgmt *mgmt;
 703         int err;
 704
 705         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 706                             sizeof(*mgmt) + 6 + extra_len);
 707         if (!skb)
 708                 return;
 709
 710         skb_reserve(skb, local->hw.extra_tx_headroom);
 711
 712         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 713         memset(mgmt, 0, 24 + 6);
 714         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 715                                           IEEE80211_STYPE_AUTH);
 716         memcpy(mgmt->da, bssid, ETH_ALEN);
 717         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 718         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 719         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 720         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 721         mgmt->u.auth.status_code = cpu_to_le16(0);
 722         if (extra)
 723                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 724
 725         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 726                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 727                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 728                 WARN_ON(err);
 729         }
 730
 731         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 732         ieee80211_tx_skb(sdata, skb);
 733 }
 734
 735 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 736                              const u8 *ie, size_t ie_len,
 737                              enum ieee80211_band band, u32 rate_mask,
 738                              u8 channel)
 739 {
 740         struct ieee80211_supported_band *sband;
 741         u8 *pos;
 742         size_t offset = 0, noffset;
 743         int supp_rates_len, i;
 744         u8 rates[32];
 745         int num_rates;
 746         int ext_rates_len;
 747
 748         sband = local->hw.wiphy->bands[band];
 749
 750         pos = buffer;
 751
 752         num_rates = 0;
 753         for (i = 0; i < sband->n_bitrates; i++) {
 754                 if ((BIT(i) & rate_mask) == 0)
 755                         continue; /* skip rate */
 756                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
 757         }
 758
 759         supp_rates_len = min_t(int, num_rates, 8);
 760
 761         *pos++ = WLAN_EID_SUPP_RATES;
 762         *pos++ = supp_rates_len;
 763         memcpy(pos, rates, supp_rates_len);
 764         pos += supp_rates_len;
 765
 766         /* insert "request information" if in custom IEs */
 767         if (ie && ie_len) {
 768                 static const u8 before_extrates[] = {
 769                         WLAN_EID_SSID,
 770                         WLAN_EID_SUPP_RATES,
 771                         WLAN_EID_REQUEST,
 772                 };
 773                 noffset = ieee80211_ie_split(ie, ie_len,
 774                                              before_extrates,
 775                                              ARRAY_SIZE(before_extrates),
 776                                              offset);
 777                 memcpy(pos, ie + offset, noffset - offset);
 778                 pos += noffset - offset;
 779                 offset = noffset;
 780         }
 781
 782         ext_rates_len = num_rates - supp_rates_len;
 783         if (ext_rates_len > 0) {
 784                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 785                 *pos++ = ext_rates_len;
 786                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
 787                 pos += ext_rates_len;
 788         }
 789
 790         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
 791                 *pos++ = WLAN_EID_DS_PARAMS;
 792                 *pos++ = 1;
 793                 *pos++ = channel;
 794         }
 795
 796         /* insert custom IEs that go before HT */
 797         if (ie && ie_len) {
 798                 static const u8 before_ht[] = {
 799                         WLAN_EID_SSID,
 800                         WLAN_EID_SUPP_RATES,
 801                         WLAN_EID_REQUEST,
 802                         WLAN_EID_EXT_SUPP_RATES,
 803                         WLAN_EID_DS_PARAMS,
 804                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 805                 };
 806                 noffset = ieee80211_ie_split(ie, ie_len,
 807                                              before_ht, ARRAY_SIZE(before_ht),
 808                                              offset);
 809                 memcpy(pos, ie + offset, noffset - offset);
 810                 pos += noffset - offset;
 811                 offset = noffset;
 812         }
 813
 814         if (sband->ht_cap.ht_supported) {
 815                 u16 cap = sband->ht_cap.cap;
 816                 __le16 tmp;
 817
 818                 *pos++ = WLAN_EID_HT_CAPABILITY;
 819                 *pos++ = sizeof(struct ieee80211_ht_cap);
 820                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 821                 tmp = cpu_to_le16(cap);
 822                 memcpy(pos, &tmp, sizeof(u16));
 823                 pos += sizeof(u16);
 824                 *pos++ = sband->ht_cap.ampdu_factor |
 825                          (sband->ht_cap.ampdu_density <<
 826                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
 827                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 828                 pos += sizeof(sband->ht_cap.mcs);
 829                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 830         }
 831
 832         /*
 833          * If adding more here, adjust code in main.c
 834          * that calculates local->scan_ies_len.
 835          */
 836
 837         /* add any remaining custom IEs */
 838         if (ie && ie_len) {
 839                 noffset = ie_len;
 840                 memcpy(pos, ie + offset, noffset - offset);
 841                 pos += noffset - offset;
 842         }
 843
 844         return pos - buffer;
 845 }
 846
 847 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
 848                                           u8 *dst, u32 ratemask,
 849                                           const u8 *ssid, size_t ssid_len,
 850                                           const u8 *ie, size_t ie_len,
 851                                           bool directed)
 852 {
 853         struct ieee80211_local *local = sdata->local;
 854         struct sk_buff *skb;
 855         struct ieee80211_mgmt *mgmt;
 856         size_t buf_len;
 857         u8 *buf;
 858         u8 chan;
 859
 860         /* FIXME: come up with a proper value */
 861         buf = kmalloc(200 + ie_len, GFP_KERNEL);
 862         if (!buf)
 863                 return NULL;
 864
 865         /*
 866          * Do not send DS Channel parameter for directed probe requests
 867          * in order to maximize the chance that we get a response.  Some
 868          * badly-behaved APs don't respond when this parameter is included.
 869          */
 870         if (directed)
 871                 chan = 0;
 872         else
 873                 chan = ieee80211_frequency_to_channel(
 874                         local->hw.conf.channel->center_freq);
 875
 876         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
 877                                            local->hw.conf.channel->band,
 878                                            ratemask, chan);
 879
 880         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
 881                                      ssid, ssid_len,
 882                                      buf, buf_len);
 883
 884         if (dst) {
 885                 mgmt = (struct ieee80211_mgmt *) skb->data;
 886                 memcpy(mgmt->da, dst, ETH_ALEN);
 887                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 888         }
 889
 890         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 891         kfree(buf);
 892
 893         return skb;
 894 }
 895
 896 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 897                               const u8 *ssid, size_t ssid_len,
 898                               const u8 *ie, size_t ie_len,
 899                               u32 ratemask, bool directed, bool no_cck)
 900 {
 901         struct sk_buff *skb;
 902
 903         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
 904                                         ie, ie_len, directed);
 905         if (skb) {
 906                 if (no_cck)
 907                         IEEE80211_SKB_CB(skb)->flags |=
 908                                 IEEE80211_TX_CTL_NO_CCK_RATE;
 909                 ieee80211_tx_skb(sdata, skb);
 910         }
 911 }
 912
 913 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 914                             struct ieee802_11_elems *elems,
 915                             enum ieee80211_band band)
 916 {
 917         struct ieee80211_supported_band *sband;
 918         struct ieee80211_rate *bitrates;
 919         size_t num_rates;
 920         u32 supp_rates;
 921         int i, j;
 922         sband = local->hw.wiphy->bands[band];
 923
 924         if (!sband) {
 925                 WARN_ON(1);
 926                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 927         }
 928
 929         bitrates = sband->bitrates;
 930         num_rates = sband->n_bitrates;
 931         supp_rates = 0;
 932         for (i = 0; i < elems->supp_rates_len +
 933                      elems->ext_supp_rates_len; i++) {
 934                 u8 rate = 0;
 935                 int own_rate;
 936                 if (i < elems->supp_rates_len)
 937                         rate = elems->supp_rates[i];
 938                 else if (elems->ext_supp_rates)
 939                         rate = elems->ext_supp_rates
 940                                 [i - elems->supp_rates_len];
 941                 own_rate = 5 * (rate & 0x7f);
 942                 for (j = 0; j < num_rates; j++)
 943                         if (bitrates[j].bitrate == own_rate)
 944                                 supp_rates |= BIT(j);
 945         }
 946         return supp_rates;
 947 }
 948
 949 void ieee80211_stop_device(struct ieee80211_local *local)
 950 {
 951         ieee80211_led_radio(local, false);
 952         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
 953
 954         cancel_work_sync(&local->reconfig_filter);
 955
 956         flush_workqueue(local->workqueue);
 957         drv_stop(local);
 958 }
 959
 960 int ieee80211_reconfig(struct ieee80211_local *local)
 961 {
 962         struct ieee80211_hw *hw = &local->hw;
 963         struct ieee80211_sub_if_data *sdata;
 964         struct sta_info *sta;
 965         int res, i;
 966
 967 #ifdef CONFIG_PM
 968         if (local->suspended)
 969                 local->resuming = true;
 970
 971         if (local->wowlan) {
 972                 local->wowlan = false;
 973                 res = drv_resume(local);
 974                 if (res < 0) {
 975                         local->resuming = false;
 976                         return res;
 977                 }
 978                 if (res == 0)
 979                         goto wake_up;
 980                 WARN_ON(res > 1);
 981                 /*
 982                  * res is 1, which means the driver requested
 983                  * to go through a regular reset on wakeup.
 984                  */
 985         }
 986 #endif
 987
 988         /* setup fragmentation threshold */
 989         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
 990
 991         /* setup RTS threshold */
 992         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
 993
 994         /* reset coverage class */
 995         drv_set_coverage_class(local, hw->wiphy->coverage_class);
 996
 997         /* everything else happens only if HW was up & running */
 998         if (!local->open_count)
 999                 goto wake_up;
1000
1001         /*
1002          * Upon resume hardware can sometimes be goofy due to
1003          * various platform / driver / bus issues, so restarting
1004          * the device may at times not work immediately. Propagate
1005          * the error.
1006          */
1007         res = drv_start(local);
1008         if (res) {
1009                 WARN(local->suspended, "Hardware became unavailable "
1010                      "upon resume. This could be a software issue "
1011                      "prior to suspend or a hardware issue.\n");
1012                 return res;
1013         }
1014
1015         ieee80211_led_radio(local, true);
1016         ieee80211_mod_tpt_led_trig(local,
1017                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1018
1019         /* add interfaces */
1020         list_for_each_entry(sdata, &local->interfaces, list) {
1021                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1022                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1023                     ieee80211_sdata_running(sdata))
1024                         res = drv_add_interface(local, &sdata->vif);
1025         }
1026
1027         /* add STAs back */
1028         mutex_lock(&local->sta_mtx);
1029         list_for_each_entry(sta, &local->sta_list, list) {
1030                 if (sta->uploaded) {
1031                         sdata = sta->sdata;
1032                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1033                                 sdata = container_of(sdata->bss,
1034                                              struct ieee80211_sub_if_data,
1035                                              u.ap);
1036
1037                         memset(&sta->sta.drv_priv, 0, hw->sta_data_size);
1038                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1039                 }
1040         }
1041         mutex_unlock(&local->sta_mtx);
1042
1043         /* reconfigure tx conf */
1044         list_for_each_entry(sdata, &local->interfaces, list) {
1045                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1046                     sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1047                     !ieee80211_sdata_running(sdata))
1048                         continue;
1049
1050                 for (i = 0; i < hw->queues; i++)
1051                         drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1052         }
1053
1054         /* reconfigure hardware */
1055         ieee80211_hw_config(local, ~0);
1056
1057         ieee80211_configure_filter(local);
1058
1059         /* Finally also reconfigure all the BSS information */
1060         list_for_each_entry(sdata, &local->interfaces, list) {
1061                 u32 changed;
1062
1063                 if (!ieee80211_sdata_running(sdata))
1064                         continue;
1065
1066                 /* common change flags for all interface types */
1067                 changed = BSS_CHANGED_ERP_CTS_PROT |
1068                           BSS_CHANGED_ERP_PREAMBLE |
1069                           BSS_CHANGED_ERP_SLOT |
1070                           BSS_CHANGED_HT |
1071                           BSS_CHANGED_BASIC_RATES |
1072                           BSS_CHANGED_BEACON_INT |
1073                           BSS_CHANGED_BSSID |
1074                           BSS_CHANGED_CQM |
1075                           BSS_CHANGED_QOS;
1076
1077                 switch (sdata->vif.type) {
1078                 case NL80211_IFTYPE_STATION:
1079                         changed |= BSS_CHANGED_ASSOC;
1080                         mutex_lock(&sdata->u.mgd.mtx);
1081                         ieee80211_bss_info_change_notify(sdata, changed);
1082                         mutex_unlock(&sdata->u.mgd.mtx);
1083                         break;
1084                 case NL80211_IFTYPE_ADHOC:
1085                         changed |= BSS_CHANGED_IBSS;
1086                         /* fall through */
1087                 case NL80211_IFTYPE_AP:
1088                         changed |= BSS_CHANGED_SSID;
1089                         /* fall through */
1090                 case NL80211_IFTYPE_MESH_POINT:
1091                         changed |= BSS_CHANGED_BEACON |
1092                                    BSS_CHANGED_BEACON_ENABLED;
1093                         ieee80211_bss_info_change_notify(sdata, changed);
1094                         break;
1095                 case NL80211_IFTYPE_WDS:
1096                         break;
1097                 case NL80211_IFTYPE_AP_VLAN:
1098                 case NL80211_IFTYPE_MONITOR:
1099                         /* ignore virtual */
1100                         break;
1101                 case NL80211_IFTYPE_UNSPECIFIED:
1102                 case NUM_NL80211_IFTYPES:
1103                 case NL80211_IFTYPE_P2P_CLIENT:
1104                 case NL80211_IFTYPE_P2P_GO:
1105                         WARN_ON(1);
1106                         break;
1107                 }
1108         }
1109
1110         /*
1111          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1112          * sessions can be established after a resume.
1113          *
1114          * Also tear down aggregation sessions since reconfiguring
1115          * them in a hardware restart scenario is not easily done
1116          * right now, and the hardware will have lost information
1117          * about the sessions, but we and the AP still think they
1118          * are active. This is really a workaround though.
1119          */
1120         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1121                 mutex_lock(&local->sta_mtx);
1122
1123                 list_for_each_entry(sta, &local->sta_list, list) {
1124                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1125                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1126                 }
1127
1128                 mutex_unlock(&local->sta_mtx);
1129         }
1130
1131         /* add back keys */
1132         list_for_each_entry(sdata, &local->interfaces, list)
1133                 if (ieee80211_sdata_running(sdata))
1134                         ieee80211_enable_keys(sdata);
1135
1136  wake_up:
1137         ieee80211_wake_queues_by_reason(hw,
1138                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1139
1140         /*
1141          * If this is for hw restart things are still running.
1142          * We may want to change that later, however.
1143          */
1144         if (!local->suspended)
1145                 return 0;
1146
1147 #ifdef CONFIG_PM
1148         /* first set suspended false, then resuming */
1149         local->suspended = false;
1150         mb();
1151         local->resuming = false;
1152
1153         list_for_each_entry(sdata, &local->interfaces, list) {
1154                 switch(sdata->vif.type) {
1155                 case NL80211_IFTYPE_STATION:
1156                         ieee80211_sta_restart(sdata);
1157                         break;
1158                 case NL80211_IFTYPE_ADHOC:
1159                         ieee80211_ibss_restart(sdata);
1160                         break;
1161                 case NL80211_IFTYPE_MESH_POINT:
1162                         ieee80211_mesh_restart(sdata);
1163                         break;
1164                 default:
1165                         break;
1166                 }
1167         }
1168
1169         mod_timer(&local->sta_cleanup, jiffies + 1);
1170
1171         mutex_lock(&local->sta_mtx);
1172         list_for_each_entry(sta, &local->sta_list, list)
1173                 mesh_plink_restart(sta);
1174         mutex_unlock(&local->sta_mtx);
1175 #else
1176         WARN_ON(1);
1177 #endif
1178         return 0;
1179 }
1180
1181 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1182 {
1183         struct ieee80211_sub_if_data *sdata;
1184         struct ieee80211_local *local;
1185         struct ieee80211_key *key;
1186
1187         if (WARN_ON(!vif))
1188                 return;
1189
1190         sdata = vif_to_sdata(vif);
1191         local = sdata->local;
1192
1193         if (WARN_ON(!local->resuming))
1194                 return;
1195
1196         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1197                 return;
1198
1199         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1200
1201         mutex_lock(&local->key_mtx);
1202         list_for_each_entry(key, &sdata->key_list, list)
1203                 key->flags |= KEY_FLAG_TAINTED;
1204         mutex_unlock(&local->key_mtx);
1205 }
1206 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1207
1208 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1209                           enum ieee80211_smps_mode *smps_mode)
1210 {
1211         if (ifmgd->associated) {
1212                 *smps_mode = ifmgd->ap_smps;
1213
1214                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1215                         if (ifmgd->powersave)
1216                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1217                         else
1218                                 *smps_mode = IEEE80211_SMPS_OFF;
1219                 }
1220
1221                 return 1;
1222         }
1223
1224         return 0;
1225 }
1226
1227 /* must hold iflist_mtx */
1228 void ieee80211_recalc_smps(struct ieee80211_local *local)
1229 {
1230         struct ieee80211_sub_if_data *sdata;
1231         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1232         int count = 0;
1233
1234         lockdep_assert_held(&local->iflist_mtx);
1235
1236         /*
1237          * This function could be improved to handle multiple
1238          * interfaces better, but right now it makes any
1239          * non-station interfaces force SM PS to be turned
1240          * off. If there are multiple station interfaces it
1241          * could also use the best possible mode, e.g. if
1242          * one is in static and the other in dynamic then
1243          * dynamic is ok.
1244          */
1245
1246         list_for_each_entry(sdata, &local->interfaces, list) {
1247                 if (!ieee80211_sdata_running(sdata))
1248                         continue;
1249                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1250                         goto set;
1251
1252                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1253
1254                 if (count > 1) {
1255                         smps_mode = IEEE80211_SMPS_OFF;
1256                         break;
1257                 }
1258         }
1259
1260         if (smps_mode == local->smps_mode)
1261                 return;
1262
1263  set:
1264         local->smps_mode = smps_mode;
1265         /* changed flag is auto-detected for this */
1266         ieee80211_hw_config(local, 0);
1267 }
1268
1269 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1270 {
1271         int i;
1272
1273         for (i = 0; i < n_ids; i++)
1274                 if (ids[i] == id)
1275                         return true;
1276         return false;
1277 }
1278
1279 /**
1280  * ieee80211_ie_split - split an IE buffer according to ordering
1281  *
1282  * @ies: the IE buffer
1283  * @ielen: the length of the IE buffer
1284  * @ids: an array with element IDs that are allowed before
1285  *      the split
1286  * @n_ids: the size of the element ID array
1287  * @offset: offset where to start splitting in the buffer
1288  *
1289  * This function splits an IE buffer by updating the @offset
1290  * variable to point to the location where the buffer should be
1291  * split.
1292  *
1293  * It assumes that the given IE buffer is well-formed, this
1294  * has to be guaranteed by the caller!
1295  *
1296  * It also assumes that the IEs in the buffer are ordered
1297  * correctly, if not the result of using this function will not
1298  * be ordered correctly either, i.e. it does no reordering.
1299  *
1300  * The function returns the offset where the next part of the
1301  * buffer starts, which may be @ielen if the entire (remainder)
1302  * of the buffer should be used.
1303  */
1304 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1305                           const u8 *ids, int n_ids, size_t offset)
1306 {
1307         size_t pos = offset;
1308
1309         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1310                 pos += 2 + ies[pos + 1];
1311
1312         return pos;
1313 }
1314
1315 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1316 {
1317         size_t pos = offset;
1318
1319         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1320                 pos += 2 + ies[pos + 1];
1321
1322         return pos;
1323 }
1324
1325 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1326                                             int rssi_min_thold,
1327                                             int rssi_max_thold)
1328 {
1329         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1330
1331         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1332                 return;
1333
1334         /*
1335          * Scale up threshold values before storing it, as the RSSI averaging
1336          * algorithm uses a scaled up value as well. Change this scaling
1337          * factor if the RSSI averaging algorithm changes.
1338          */
1339         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1340         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1341 }
1342
1343 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1344                                     int rssi_min_thold,
1345                                     int rssi_max_thold)
1346 {
1347         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1348
1349         WARN_ON(rssi_min_thold == rssi_max_thold ||
1350                 rssi_min_thold > rssi_max_thold);
1351
1352         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1353                                        rssi_max_thold);
1354 }
1355 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1356
1357 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1358 {
1359         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1360
1361         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1362 }
1363 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1364
1365 int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1366 {
1367         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1368         struct ieee80211_local *local = sdata->local;
1369         struct ieee80211_supported_band *sband;
1370         int rate;
1371         u8 i, rates, *pos;
1372
1373         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1374         rates = sband->n_bitrates;
1375         if (rates > 8)
1376                 rates = 8;
1377
1378         if (skb_tailroom(skb) < rates + 2)
1379                 return -ENOMEM;
1380
1381         pos = skb_put(skb, rates + 2);
1382         *pos++ = WLAN_EID_SUPP_RATES;
1383         *pos++ = rates;
1384         for (i = 0; i < rates; i++) {
1385                 rate = sband->bitrates[i].bitrate;
1386                 *pos++ = (u8) (rate / 5);
1387         }
1388
1389         return 0;
1390 }
1391
1392 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1393 {
1394         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1395         struct ieee80211_local *local = sdata->local;
1396         struct ieee80211_supported_band *sband;
1397         int rate;
1398         u8 i, exrates, *pos;
1399
1400         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1401         exrates = sband->n_bitrates;
1402         if (exrates > 8)
1403                 exrates -= 8;
1404         else
1405                 exrates = 0;
1406
1407         if (skb_tailroom(skb) < exrates + 2)
1408                 return -ENOMEM;
1409
1410         if (exrates) {
1411                 pos = skb_put(skb, exrates + 2);
1412                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1413                 *pos++ = exrates;
1414                 for (i = 8; i < sband->n_bitrates; i++) {
1415                         rate = sband->bitrates[i].bitrate;
1416                         *pos++ = (u8) (rate / 5);
1417                 }
1418         }
1419         return 0;
1420 }