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         if (!skb)
 884                 goto out;
 885
 886         if (dst) {
 887                 mgmt = (struct ieee80211_mgmt *) skb->data;
 888                 memcpy(mgmt->da, dst, ETH_ALEN);
 889                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 890         }
 891
 892         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 893
 894  out:
 895         kfree(buf);
 896
 897         return skb;
 898 }
 899
 900 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 901                               const u8 *ssid, size_t ssid_len,
 902                               const u8 *ie, size_t ie_len,
 903                               u32 ratemask, bool directed, bool no_cck)
 904 {
 905         struct sk_buff *skb;
 906
 907         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
 908                                         ie, ie_len, directed);
 909         if (skb) {
 910                 if (no_cck)
 911                         IEEE80211_SKB_CB(skb)->flags |=
 912                                 IEEE80211_TX_CTL_NO_CCK_RATE;
 913                 ieee80211_tx_skb(sdata, skb);
 914         }
 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                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1042                 }
1043         }
1044         mutex_unlock(&local->sta_mtx);
1045
1046         /* reconfigure tx conf */
1047         list_for_each_entry(sdata, &local->interfaces, list) {
1048                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1049                     sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1050                     !ieee80211_sdata_running(sdata))
1051                         continue;
1052
1053                 for (i = 0; i < hw->queues; i++)
1054                         drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1055         }
1056
1057         /* reconfigure hardware */
1058         ieee80211_hw_config(local, ~0);
1059
1060         ieee80211_configure_filter(local);
1061
1062         /* Finally also reconfigure all the BSS information */
1063         list_for_each_entry(sdata, &local->interfaces, list) {
1064                 u32 changed;
1065
1066                 if (!ieee80211_sdata_running(sdata))
1067                         continue;
1068
1069                 /* common change flags for all interface types */
1070                 changed = BSS_CHANGED_ERP_CTS_PROT |
1071                           BSS_CHANGED_ERP_PREAMBLE |
1072                           BSS_CHANGED_ERP_SLOT |
1073                           BSS_CHANGED_HT |
1074                           BSS_CHANGED_BASIC_RATES |
1075                           BSS_CHANGED_BEACON_INT |
1076                           BSS_CHANGED_BSSID |
1077                           BSS_CHANGED_CQM |
1078                           BSS_CHANGED_QOS;
1079
1080                 switch (sdata->vif.type) {
1081                 case NL80211_IFTYPE_STATION:
1082                         changed |= BSS_CHANGED_ASSOC;
1083                         mutex_lock(&sdata->u.mgd.mtx);
1084                         ieee80211_bss_info_change_notify(sdata, changed);
1085                         mutex_unlock(&sdata->u.mgd.mtx);
1086                         break;
1087                 case NL80211_IFTYPE_ADHOC:
1088                         changed |= BSS_CHANGED_IBSS;
1089                         /* fall through */
1090                 case NL80211_IFTYPE_AP:
1091                         changed |= BSS_CHANGED_SSID;
1092                         /* fall through */
1093                 case NL80211_IFTYPE_MESH_POINT:
1094                         changed |= BSS_CHANGED_BEACON |
1095                                    BSS_CHANGED_BEACON_ENABLED;
1096                         ieee80211_bss_info_change_notify(sdata, changed);
1097                         break;
1098                 case NL80211_IFTYPE_WDS:
1099                         break;
1100                 case NL80211_IFTYPE_AP_VLAN:
1101                 case NL80211_IFTYPE_MONITOR:
1102                         /* ignore virtual */
1103                         break;
1104                 case NL80211_IFTYPE_UNSPECIFIED:
1105                 case NUM_NL80211_IFTYPES:
1106                 case NL80211_IFTYPE_P2P_CLIENT:
1107                 case NL80211_IFTYPE_P2P_GO:
1108                         WARN_ON(1);
1109                         break;
1110                 }
1111         }
1112
1113         /*
1114          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1115          * sessions can be established after a resume.
1116          *
1117          * Also tear down aggregation sessions since reconfiguring
1118          * them in a hardware restart scenario is not easily done
1119          * right now, and the hardware will have lost information
1120          * about the sessions, but we and the AP still think they
1121          * are active. This is really a workaround though.
1122          */
1123         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1124                 mutex_lock(&local->sta_mtx);
1125
1126                 list_for_each_entry(sta, &local->sta_list, list) {
1127                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1128                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1129                 }
1130
1131                 mutex_unlock(&local->sta_mtx);
1132         }
1133
1134         /* add back keys */
1135         list_for_each_entry(sdata, &local->interfaces, list)
1136                 if (ieee80211_sdata_running(sdata))
1137                         ieee80211_enable_keys(sdata);
1138
1139  wake_up:
1140         ieee80211_wake_queues_by_reason(hw,
1141                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1142
1143         /*
1144          * If this is for hw restart things are still running.
1145          * We may want to change that later, however.
1146          */
1147         if (!local->suspended)
1148                 return 0;
1149
1150 #ifdef CONFIG_PM
1151         /* first set suspended false, then resuming */
1152         local->suspended = false;
1153         mb();
1154         local->resuming = false;
1155
1156         list_for_each_entry(sdata, &local->interfaces, list) {
1157                 switch(sdata->vif.type) {
1158                 case NL80211_IFTYPE_STATION:
1159                         ieee80211_sta_restart(sdata);
1160                         break;
1161                 case NL80211_IFTYPE_ADHOC:
1162                         ieee80211_ibss_restart(sdata);
1163                         break;
1164                 case NL80211_IFTYPE_MESH_POINT:
1165                         ieee80211_mesh_restart(sdata);
1166                         break;
1167                 default:
1168                         break;
1169                 }
1170         }
1171
1172         mod_timer(&local->sta_cleanup, jiffies + 1);
1173
1174         mutex_lock(&local->sta_mtx);
1175         list_for_each_entry(sta, &local->sta_list, list)
1176                 mesh_plink_restart(sta);
1177         mutex_unlock(&local->sta_mtx);
1178 #else
1179         WARN_ON(1);
1180 #endif
1181         return 0;
1182 }
1183
1184 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1185 {
1186         struct ieee80211_sub_if_data *sdata;
1187         struct ieee80211_local *local;
1188         struct ieee80211_key *key;
1189
1190         if (WARN_ON(!vif))
1191                 return;
1192
1193         sdata = vif_to_sdata(vif);
1194         local = sdata->local;
1195
1196         if (WARN_ON(!local->resuming))
1197                 return;
1198
1199         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1200                 return;
1201
1202         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1203
1204         mutex_lock(&local->key_mtx);
1205         list_for_each_entry(key, &sdata->key_list, list)
1206                 key->flags |= KEY_FLAG_TAINTED;
1207         mutex_unlock(&local->key_mtx);
1208 }
1209 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1210
1211 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1212                           enum ieee80211_smps_mode *smps_mode)
1213 {
1214         if (ifmgd->associated) {
1215                 *smps_mode = ifmgd->ap_smps;
1216
1217                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1218                         if (ifmgd->powersave)
1219                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1220                         else
1221                                 *smps_mode = IEEE80211_SMPS_OFF;
1222                 }
1223
1224                 return 1;
1225         }
1226
1227         return 0;
1228 }
1229
1230 /* must hold iflist_mtx */
1231 void ieee80211_recalc_smps(struct ieee80211_local *local)
1232 {
1233         struct ieee80211_sub_if_data *sdata;
1234         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1235         int count = 0;
1236
1237         lockdep_assert_held(&local->iflist_mtx);
1238
1239         /*
1240          * This function could be improved to handle multiple
1241          * interfaces better, but right now it makes any
1242          * non-station interfaces force SM PS to be turned
1243          * off. If there are multiple station interfaces it
1244          * could also use the best possible mode, e.g. if
1245          * one is in static and the other in dynamic then
1246          * dynamic is ok.
1247          */
1248
1249         list_for_each_entry(sdata, &local->interfaces, list) {
1250                 if (!ieee80211_sdata_running(sdata))
1251                         continue;
1252                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1253                         goto set;
1254
1255                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1256
1257                 if (count > 1) {
1258                         smps_mode = IEEE80211_SMPS_OFF;
1259                         break;
1260                 }
1261         }
1262
1263         if (smps_mode == local->smps_mode)
1264                 return;
1265
1266  set:
1267         local->smps_mode = smps_mode;
1268         /* changed flag is auto-detected for this */
1269         ieee80211_hw_config(local, 0);
1270 }
1271
1272 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1273 {
1274         int i;
1275
1276         for (i = 0; i < n_ids; i++)
1277                 if (ids[i] == id)
1278                         return true;
1279         return false;
1280 }
1281
1282 /**
1283  * ieee80211_ie_split - split an IE buffer according to ordering
1284  *
1285  * @ies: the IE buffer
1286  * @ielen: the length of the IE buffer
1287  * @ids: an array with element IDs that are allowed before
1288  *      the split
1289  * @n_ids: the size of the element ID array
1290  * @offset: offset where to start splitting in the buffer
1291  *
1292  * This function splits an IE buffer by updating the @offset
1293  * variable to point to the location where the buffer should be
1294  * split.
1295  *
1296  * It assumes that the given IE buffer is well-formed, this
1297  * has to be guaranteed by the caller!
1298  *
1299  * It also assumes that the IEs in the buffer are ordered
1300  * correctly, if not the result of using this function will not
1301  * be ordered correctly either, i.e. it does no reordering.
1302  *
1303  * The function returns the offset where the next part of the
1304  * buffer starts, which may be @ielen if the entire (remainder)
1305  * of the buffer should be used.
1306  */
1307 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1308                           const u8 *ids, int n_ids, size_t offset)
1309 {
1310         size_t pos = offset;
1311
1312         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1313                 pos += 2 + ies[pos + 1];
1314
1315         return pos;
1316 }
1317
1318 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1319 {
1320         size_t pos = offset;
1321
1322         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1323                 pos += 2 + ies[pos + 1];
1324
1325         return pos;
1326 }
1327
1328 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1329                                             int rssi_min_thold,
1330                                             int rssi_max_thold)
1331 {
1332         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1333
1334         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1335                 return;
1336
1337         /*
1338          * Scale up threshold values before storing it, as the RSSI averaging
1339          * algorithm uses a scaled up value as well. Change this scaling
1340          * factor if the RSSI averaging algorithm changes.
1341          */
1342         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1343         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1344 }
1345
1346 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1347                                     int rssi_min_thold,
1348                                     int rssi_max_thold)
1349 {
1350         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1351
1352         WARN_ON(rssi_min_thold == rssi_max_thold ||
1353                 rssi_min_thold > rssi_max_thold);
1354
1355         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1356                                        rssi_max_thold);
1357 }
1358 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1359
1360 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1361 {
1362         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1363
1364         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1365 }
1366 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1367
1368 int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1369 {
1370         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1371         struct ieee80211_local *local = sdata->local;
1372         struct ieee80211_supported_band *sband;
1373         int rate;
1374         u8 i, rates, *pos;
1375
1376         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1377         rates = sband->n_bitrates;
1378         if (rates > 8)
1379                 rates = 8;
1380
1381         if (skb_tailroom(skb) < rates + 2)
1382                 return -ENOMEM;
1383
1384         pos = skb_put(skb, rates + 2);
1385         *pos++ = WLAN_EID_SUPP_RATES;
1386         *pos++ = rates;
1387         for (i = 0; i < rates; i++) {
1388                 rate = sband->bitrates[i].bitrate;
1389                 *pos++ = (u8) (rate / 5);
1390         }
1391
1392         return 0;
1393 }
1394
1395 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1396 {
1397         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1398         struct ieee80211_local *local = sdata->local;
1399         struct ieee80211_supported_band *sband;
1400         int rate;
1401         u8 i, exrates, *pos;
1402
1403         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1404         exrates = sband->n_bitrates;
1405         if (exrates > 8)
1406                 exrates -= 8;
1407         else
1408                 exrates = 0;
1409
1410         if (skb_tailroom(skb) < exrates + 2)
1411                 return -ENOMEM;
1412
1413         if (exrates) {
1414                 pos = skb_put(skb, exrates + 2);
1415                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1416                 *pos++ = exrates;
1417                 for (i = 8; i < sband->n_bitrates; i++) {
1418                         rate = sband->bitrates[i].bitrate;
1419                         *pos++ = (u8) (rate / 5);
1420                 }
1421         }
1422         return 0;
1423 }