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 <linux/crc32.h>
  23 #include <net/net_namespace.h>
  24 #include <net/cfg80211.h>
  25 #include <net/rtnetlink.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wme.h"
  32 #include "led.h"
  33 #include "wep.h"
  34
  35 /* privid for wiphys to determine whether they belong to us or not */
  36 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  37
  38 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  39 {
  40         struct ieee80211_local *local;
  41         BUG_ON(!wiphy);
  42
  43         local = wiphy_priv(wiphy);
  44         return &local->hw;
  45 }
  46 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  47
  48 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  49                         enum nl80211_iftype type)
  50 {
  51         __le16 fc = hdr->frame_control;
  52
  53          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  54         if (len < 16)
  55                 return NULL;
  56
  57         if (ieee80211_is_data(fc)) {
  58                 if (len < 24) /* drop incorrect hdr len (data) */
  59                         return NULL;
  60
  61                 if (ieee80211_has_a4(fc))
  62                         return NULL;
  63                 if (ieee80211_has_tods(fc))
  64                         return hdr->addr1;
  65                 if (ieee80211_has_fromds(fc))
  66                         return hdr->addr2;
  67
  68                 return hdr->addr3;
  69         }
  70
  71         if (ieee80211_is_mgmt(fc)) {
  72                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  73                         return NULL;
  74                 return hdr->addr3;
  75         }
  76
  77         if (ieee80211_is_ctl(fc)) {
  78                 if(ieee80211_is_pspoll(fc))
  79                         return hdr->addr1;
  80
  81                 if (ieee80211_is_back_req(fc)) {
  82                         switch (type) {
  83                         case NL80211_IFTYPE_STATION:
  84                                 return hdr->addr2;
  85                         case NL80211_IFTYPE_AP:
  86                         case NL80211_IFTYPE_AP_VLAN:
  87                                 return hdr->addr1;
  88                         default:
  89                                 break; /* fall through to the return */
  90                         }
  91                 }
  92         }
  93
  94         return NULL;
  95 }
  96
  97 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  98 {
  99         struct sk_buff *skb = tx->skb;
 100         struct ieee80211_hdr *hdr;
 101
 102         do {
 103                 hdr = (struct ieee80211_hdr *) skb->data;
 104                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 105         } while ((skb = skb->next));
 106 }
 107
 108 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 109                              int rate, int erp, int short_preamble)
 110 {
 111         int dur;
 112
 113         /* calculate duration (in microseconds, rounded up to next higher
 114          * integer if it includes a fractional microsecond) to send frame of
 115          * len bytes (does not include FCS) at the given rate. Duration will
 116          * also include SIFS.
 117          *
 118          * rate is in 100 kbps, so divident is multiplied by 10 in the
 119          * DIV_ROUND_UP() operations.
 120          */
 121
 122         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 123                 /*
 124                  * OFDM:
 125                  *
 126                  * N_DBPS = DATARATE x 4
 127                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 128                  *      (16 = SIGNAL time, 6 = tail bits)
 129                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 130                  *
 131                  * T_SYM = 4 usec
 132                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 133                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 134                  *      signal ext = 6 usec
 135                  */
 136                 dur = 16; /* SIFS + signal ext */
 137                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 138                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 139                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 140                                         4 * rate); /* T_SYM x N_SYM */
 141         } else {
 142                 /*
 143                  * 802.11b or 802.11g with 802.11b compatibility:
 144                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 145                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 146                  *
 147                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 148                  * aSIFSTime = 10 usec
 149                  * aPreambleLength = 144 usec or 72 usec with short preamble
 150                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 151                  */
 152                 dur = 10; /* aSIFSTime = 10 usec */
 153                 dur += short_preamble ? (72 + 24) : (144 + 48);
 154
 155                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 156         }
 157
 158         return dur;
 159 }
 160
 161 /* Exported duration function for driver use */
 162 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 163                                         struct ieee80211_vif *vif,
 164                                         size_t frame_len,
 165                                         struct ieee80211_rate *rate)
 166 {
 167         struct ieee80211_local *local = hw_to_local(hw);
 168         struct ieee80211_sub_if_data *sdata;
 169         u16 dur;
 170         int erp;
 171         bool short_preamble = false;
 172
 173         erp = 0;
 174         if (vif) {
 175                 sdata = vif_to_sdata(vif);
 176                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 177                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 178                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 179         }
 180
 181         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 182                                        short_preamble);
 183
 184         return cpu_to_le16(dur);
 185 }
 186 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 187
 188 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 189                               struct ieee80211_vif *vif, size_t frame_len,
 190                               const struct ieee80211_tx_info *frame_txctl)
 191 {
 192         struct ieee80211_local *local = hw_to_local(hw);
 193         struct ieee80211_rate *rate;
 194         struct ieee80211_sub_if_data *sdata;
 195         bool short_preamble;
 196         int erp;
 197         u16 dur;
 198         struct ieee80211_supported_band *sband;
 199
 200         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 201
 202         short_preamble = false;
 203
 204         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 205
 206         erp = 0;
 207         if (vif) {
 208                 sdata = vif_to_sdata(vif);
 209                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 210                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 211                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 212         }
 213
 214         /* CTS duration */
 215         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 216                                        erp, short_preamble);
 217         /* Data frame duration */
 218         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 219                                         erp, short_preamble);
 220         /* ACK duration */
 221         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 222                                         erp, short_preamble);
 223
 224         return cpu_to_le16(dur);
 225 }
 226 EXPORT_SYMBOL(ieee80211_rts_duration);
 227
 228 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 229                                     struct ieee80211_vif *vif,
 230                                     size_t frame_len,
 231                                     const struct ieee80211_tx_info *frame_txctl)
 232 {
 233         struct ieee80211_local *local = hw_to_local(hw);
 234         struct ieee80211_rate *rate;
 235         struct ieee80211_sub_if_data *sdata;
 236         bool short_preamble;
 237         int erp;
 238         u16 dur;
 239         struct ieee80211_supported_band *sband;
 240
 241         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 242
 243         short_preamble = false;
 244
 245         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 246         erp = 0;
 247         if (vif) {
 248                 sdata = vif_to_sdata(vif);
 249                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 250                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 251                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 252         }
 253
 254         /* Data frame duration */
 255         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 256                                        erp, short_preamble);
 257         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 258                 /* ACK duration */
 259                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 260                                                 erp, short_preamble);
 261         }
 262
 263         return cpu_to_le16(dur);
 264 }
 265 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 266
 267 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 268                                    enum queue_stop_reason reason)
 269 {
 270         struct ieee80211_local *local = hw_to_local(hw);
 271         struct ieee80211_sub_if_data *sdata;
 272
 273         trace_wake_queue(local, queue, reason);
 274
 275         if (WARN_ON(queue >= hw->queues))
 276                 return;
 277
 278         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 279
 280         if (local->queue_stop_reasons[queue] != 0)
 281                 /* someone still has this queue stopped */
 282                 return;
 283
 284         if (skb_queue_empty(&local->pending[queue])) {
 285                 rcu_read_lock();
 286                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 287                         if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 288                                 continue;
 289                         netif_wake_subqueue(sdata->dev, queue);
 290                 }
 291                 rcu_read_unlock();
 292         } else
 293                 tasklet_schedule(&local->tx_pending_tasklet);
 294 }
 295
 296 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 297                                     enum queue_stop_reason reason)
 298 {
 299         struct ieee80211_local *local = hw_to_local(hw);
 300         unsigned long flags;
 301
 302         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 303         __ieee80211_wake_queue(hw, queue, reason);
 304         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 305 }
 306
 307 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 308 {
 309         ieee80211_wake_queue_by_reason(hw, queue,
 310                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 311 }
 312 EXPORT_SYMBOL(ieee80211_wake_queue);
 313
 314 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 315                                    enum queue_stop_reason reason)
 316 {
 317         struct ieee80211_local *local = hw_to_local(hw);
 318         struct ieee80211_sub_if_data *sdata;
 319
 320         trace_stop_queue(local, queue, reason);
 321
 322         if (WARN_ON(queue >= hw->queues))
 323                 return;
 324
 325         __set_bit(reason, &local->queue_stop_reasons[queue]);
 326
 327         rcu_read_lock();
 328         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 329                 netif_stop_subqueue(sdata->dev, queue);
 330         rcu_read_unlock();
 331 }
 332
 333 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 334                                     enum queue_stop_reason reason)
 335 {
 336         struct ieee80211_local *local = hw_to_local(hw);
 337         unsigned long flags;
 338
 339         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 340         __ieee80211_stop_queue(hw, queue, reason);
 341         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 342 }
 343
 344 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 345 {
 346         ieee80211_stop_queue_by_reason(hw, queue,
 347                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 348 }
 349 EXPORT_SYMBOL(ieee80211_stop_queue);
 350
 351 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 352                                struct sk_buff *skb)
 353 {
 354         struct ieee80211_hw *hw = &local->hw;
 355         unsigned long flags;
 356         int queue = skb_get_queue_mapping(skb);
 357         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 358
 359         if (WARN_ON(!info->control.vif)) {
 360                 kfree_skb(skb);
 361                 return;
 362         }
 363
 364         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 365         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 366         __skb_queue_tail(&local->pending[queue], skb);
 367         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 368         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 369 }
 370
 371 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 372                                struct sk_buff_head *skbs)
 373 {
 374         struct ieee80211_hw *hw = &local->hw;
 375         struct sk_buff *skb;
 376         unsigned long flags;
 377         int queue, ret = 0, i;
 378
 379         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 380         for (i = 0; i < hw->queues; i++)
 381                 __ieee80211_stop_queue(hw, i,
 382                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 383
 384         while ((skb = skb_dequeue(skbs))) {
 385                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 386
 387                 if (WARN_ON(!info->control.vif)) {
 388                         kfree_skb(skb);
 389                         continue;
 390                 }
 391
 392                 ret++;
 393                 queue = skb_get_queue_mapping(skb);
 394                 __skb_queue_tail(&local->pending[queue], skb);
 395         }
 396
 397         for (i = 0; i < hw->queues; i++)
 398                 __ieee80211_wake_queue(hw, i,
 399                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 400         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 401
 402         return ret;
 403 }
 404
 405 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 406                                     enum queue_stop_reason reason)
 407 {
 408         struct ieee80211_local *local = hw_to_local(hw);
 409         unsigned long flags;
 410         int i;
 411
 412         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 413
 414         for (i = 0; i < hw->queues; i++)
 415                 __ieee80211_stop_queue(hw, i, reason);
 416
 417         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 418 }
 419
 420 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 421 {
 422         ieee80211_stop_queues_by_reason(hw,
 423                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 424 }
 425 EXPORT_SYMBOL(ieee80211_stop_queues);
 426
 427 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 428 {
 429         struct ieee80211_local *local = hw_to_local(hw);
 430         unsigned long flags;
 431         int ret;
 432
 433         if (WARN_ON(queue >= hw->queues))
 434                 return true;
 435
 436         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 437         ret = !!local->queue_stop_reasons[queue];
 438         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 439         return ret;
 440 }
 441 EXPORT_SYMBOL(ieee80211_queue_stopped);
 442
 443 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 444                                      enum queue_stop_reason reason)
 445 {
 446         struct ieee80211_local *local = hw_to_local(hw);
 447         unsigned long flags;
 448         int i;
 449
 450         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 451
 452         for (i = 0; i < hw->queues; i++)
 453                 __ieee80211_wake_queue(hw, i, reason);
 454
 455         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 456 }
 457
 458 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 459 {
 460         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 461 }
 462 EXPORT_SYMBOL(ieee80211_wake_queues);
 463
 464 void ieee80211_iterate_active_interfaces(
 465         struct ieee80211_hw *hw,
 466         void (*iterator)(void *data, u8 *mac,
 467                          struct ieee80211_vif *vif),
 468         void *data)
 469 {
 470         struct ieee80211_local *local = hw_to_local(hw);
 471         struct ieee80211_sub_if_data *sdata;
 472
 473         mutex_lock(&local->iflist_mtx);
 474
 475         list_for_each_entry(sdata, &local->interfaces, list) {
 476                 switch (sdata->vif.type) {
 477                 case NL80211_IFTYPE_MONITOR:
 478                 case NL80211_IFTYPE_AP_VLAN:
 479                         continue;
 480                 default:
 481                         break;
 482                 }
 483                 if (ieee80211_sdata_running(sdata))
 484                         iterator(data, sdata->vif.addr,
 485                                  &sdata->vif);
 486         }
 487
 488         mutex_unlock(&local->iflist_mtx);
 489 }
 490 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 491
 492 void ieee80211_iterate_active_interfaces_atomic(
 493         struct ieee80211_hw *hw,
 494         void (*iterator)(void *data, u8 *mac,
 495                          struct ieee80211_vif *vif),
 496         void *data)
 497 {
 498         struct ieee80211_local *local = hw_to_local(hw);
 499         struct ieee80211_sub_if_data *sdata;
 500
 501         rcu_read_lock();
 502
 503         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 504                 switch (sdata->vif.type) {
 505                 case NL80211_IFTYPE_MONITOR:
 506                 case NL80211_IFTYPE_AP_VLAN:
 507                         continue;
 508                 default:
 509                         break;
 510                 }
 511                 if (ieee80211_sdata_running(sdata))
 512                         iterator(data, sdata->vif.addr,
 513                                  &sdata->vif);
 514         }
 515
 516         rcu_read_unlock();
 517 }
 518 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 519
 520 /*
 521  * Nothing should have been stuffed into the workqueue during
 522  * the suspend->resume cycle. If this WARN is seen then there
 523  * is a bug with either the driver suspend or something in
 524  * mac80211 stuffing into the workqueue which we haven't yet
 525  * cleared during mac80211's suspend cycle.
 526  */
 527 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 528 {
 529         if (WARN(local->suspended && !local->resuming,
 530                  "queueing ieee80211 work while going to suspend\n"))
 531                 return false;
 532
 533         return true;
 534 }
 535
 536 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 537 {
 538         struct ieee80211_local *local = hw_to_local(hw);
 539
 540         if (!ieee80211_can_queue_work(local))
 541                 return;
 542
 543         queue_work(local->workqueue, work);
 544 }
 545 EXPORT_SYMBOL(ieee80211_queue_work);
 546
 547 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 548                                   struct delayed_work *dwork,
 549                                   unsigned long delay)
 550 {
 551         struct ieee80211_local *local = hw_to_local(hw);
 552
 553         if (!ieee80211_can_queue_work(local))
 554                 return;
 555
 556         queue_delayed_work(local->workqueue, dwork, delay);
 557 }
 558 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 559
 560 void ieee802_11_parse_elems(u8 *start, size_t len,
 561                             struct ieee802_11_elems *elems)
 562 {
 563         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 564 }
 565
 566 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 567                                struct ieee802_11_elems *elems,
 568                                u64 filter, u32 crc)
 569 {
 570         size_t left = len;
 571         u8 *pos = start;
 572         bool calc_crc = filter != 0;
 573
 574         memset(elems, 0, sizeof(*elems));
 575         elems->ie_start = start;
 576         elems->total_len = len;
 577
 578         while (left >= 2) {
 579                 u8 id, elen;
 580
 581                 id = *pos++;
 582                 elen = *pos++;
 583                 left -= 2;
 584
 585                 if (elen > left)
 586                         break;
 587
 588                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 589                         crc = crc32_be(crc, pos - 2, elen + 2);
 590
 591                 switch (id) {
 592                 case WLAN_EID_SSID:
 593                         elems->ssid = pos;
 594                         elems->ssid_len = elen;
 595                         break;
 596                 case WLAN_EID_SUPP_RATES:
 597                         elems->supp_rates = pos;
 598                         elems->supp_rates_len = elen;
 599                         break;
 600                 case WLAN_EID_FH_PARAMS:
 601                         elems->fh_params = pos;
 602                         elems->fh_params_len = elen;
 603                         break;
 604                 case WLAN_EID_DS_PARAMS:
 605                         elems->ds_params = pos;
 606                         elems->ds_params_len = elen;
 607                         break;
 608                 case WLAN_EID_CF_PARAMS:
 609                         elems->cf_params = pos;
 610                         elems->cf_params_len = elen;
 611                         break;
 612                 case WLAN_EID_TIM:
 613                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 614                                 elems->tim = (void *)pos;
 615                                 elems->tim_len = elen;
 616                         }
 617                         break;
 618                 case WLAN_EID_IBSS_PARAMS:
 619                         elems->ibss_params = pos;
 620                         elems->ibss_params_len = elen;
 621                         break;
 622                 case WLAN_EID_CHALLENGE:
 623                         elems->challenge = pos;
 624                         elems->challenge_len = elen;
 625                         break;
 626                 case WLAN_EID_VENDOR_SPECIFIC:
 627                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 628                             pos[2] == 0xf2) {
 629                                 /* Microsoft OUI (00:50:F2) */
 630
 631                                 if (calc_crc)
 632                                         crc = crc32_be(crc, pos - 2, elen + 2);
 633
 634                                 if (pos[3] == 1) {
 635                                         /* OUI Type 1 - WPA IE */
 636                                         elems->wpa = pos;
 637                                         elems->wpa_len = elen;
 638                                 } else if (elen >= 5 && pos[3] == 2) {
 639                                         /* OUI Type 2 - WMM IE */
 640                                         if (pos[4] == 0) {
 641                                                 elems->wmm_info = pos;
 642                                                 elems->wmm_info_len = elen;
 643                                         } else if (pos[4] == 1) {
 644                                                 elems->wmm_param = pos;
 645                                                 elems->wmm_param_len = elen;
 646                                         }
 647                                 }
 648                         }
 649                         break;
 650                 case WLAN_EID_RSN:
 651                         elems->rsn = pos;
 652                         elems->rsn_len = elen;
 653                         break;
 654                 case WLAN_EID_ERP_INFO:
 655                         elems->erp_info = pos;
 656                         elems->erp_info_len = elen;
 657                         break;
 658                 case WLAN_EID_EXT_SUPP_RATES:
 659                         elems->ext_supp_rates = pos;
 660                         elems->ext_supp_rates_len = elen;
 661                         break;
 662                 case WLAN_EID_HT_CAPABILITY:
 663                         if (elen >= sizeof(struct ieee80211_ht_cap))
 664                                 elems->ht_cap_elem = (void *)pos;
 665                         break;
 666                 case WLAN_EID_HT_INFORMATION:
 667                         if (elen >= sizeof(struct ieee80211_ht_info))
 668                                 elems->ht_info_elem = (void *)pos;
 669                         break;
 670                 case WLAN_EID_MESH_ID:
 671                         elems->mesh_id = pos;
 672                         elems->mesh_id_len = elen;
 673                         break;
 674                 case WLAN_EID_MESH_CONFIG:
 675                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 676                                 elems->mesh_config = (void *)pos;
 677                         break;
 678                 case WLAN_EID_PEER_LINK:
 679                         elems->peer_link = pos;
 680                         elems->peer_link_len = elen;
 681                         break;
 682                 case WLAN_EID_PREQ:
 683                         elems->preq = pos;
 684                         elems->preq_len = elen;
 685                         break;
 686                 case WLAN_EID_PREP:
 687                         elems->prep = pos;
 688                         elems->prep_len = elen;
 689                         break;
 690                 case WLAN_EID_PERR:
 691                         elems->perr = pos;
 692                         elems->perr_len = elen;
 693                         break;
 694                 case WLAN_EID_RANN:
 695                         if (elen >= sizeof(struct ieee80211_rann_ie))
 696                                 elems->rann = (void *)pos;
 697                         break;
 698                 case WLAN_EID_CHANNEL_SWITCH:
 699                         elems->ch_switch_elem = pos;
 700                         elems->ch_switch_elem_len = elen;
 701                         break;
 702                 case WLAN_EID_QUIET:
 703                         if (!elems->quiet_elem) {
 704                                 elems->quiet_elem = pos;
 705                                 elems->quiet_elem_len = elen;
 706                         }
 707                         elems->num_of_quiet_elem++;
 708                         break;
 709                 case WLAN_EID_COUNTRY:
 710                         elems->country_elem = pos;
 711                         elems->country_elem_len = elen;
 712                         break;
 713                 case WLAN_EID_PWR_CONSTRAINT:
 714                         elems->pwr_constr_elem = pos;
 715                         elems->pwr_constr_elem_len = elen;
 716                         break;
 717                 case WLAN_EID_TIMEOUT_INTERVAL:
 718                         elems->timeout_int = pos;
 719                         elems->timeout_int_len = elen;
 720                         break;
 721                 default:
 722                         break;
 723                 }
 724
 725                 left -= elen;
 726                 pos += elen;
 727         }
 728
 729         return crc;
 730 }
 731
 732 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 733 {
 734         struct ieee80211_local *local = sdata->local;
 735         struct ieee80211_tx_queue_params qparam;
 736         int queue;
 737         bool use_11b;
 738         int aCWmin, aCWmax;
 739
 740         if (!local->ops->conf_tx)
 741                 return;
 742
 743         memset(&qparam, 0, sizeof(qparam));
 744
 745         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 746                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 747
 748         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 749                 /* Set defaults according to 802.11-2007 Table 7-37 */
 750                 aCWmax = 1023;
 751                 if (use_11b)
 752                         aCWmin = 31;
 753                 else
 754                         aCWmin = 15;
 755
 756                 switch (queue) {
 757                 case 3: /* AC_BK */
 758                         qparam.cw_max = aCWmax;
 759                         qparam.cw_min = aCWmin;
 760                         qparam.txop = 0;
 761                         qparam.aifs = 7;
 762                         break;
 763                 default: /* never happens but let's not leave undefined */
 764                 case 2: /* AC_BE */
 765                         qparam.cw_max = aCWmax;
 766                         qparam.cw_min = aCWmin;
 767                         qparam.txop = 0;
 768                         qparam.aifs = 3;
 769                         break;
 770                 case 1: /* AC_VI */
 771                         qparam.cw_max = aCWmin;
 772                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 773                         if (use_11b)
 774                                 qparam.txop = 6016/32;
 775                         else
 776                                 qparam.txop = 3008/32;
 777                         qparam.aifs = 2;
 778                         break;
 779                 case 0: /* AC_VO */
 780                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 781                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 782                         if (use_11b)
 783                                 qparam.txop = 3264/32;
 784                         else
 785                                 qparam.txop = 1504/32;
 786                         qparam.aifs = 2;
 787                         break;
 788                 }
 789
 790                 qparam.uapsd = false;
 791
 792                 drv_conf_tx(local, queue, &qparam);
 793         }
 794
 795         /* after reinitialize QoS TX queues setting to default,
 796          * disable QoS at all */
 797
 798         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 799                 sdata->vif.bss_conf.qos =
 800                         sdata->vif.type != NL80211_IFTYPE_STATION;
 801                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 802         }
 803 }
 804
 805 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 806                                   const size_t supp_rates_len,
 807                                   const u8 *supp_rates)
 808 {
 809         struct ieee80211_local *local = sdata->local;
 810         int i, have_higher_than_11mbit = 0;
 811
 812         /* cf. IEEE 802.11 9.2.12 */
 813         for (i = 0; i < supp_rates_len; i++)
 814                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 815                         have_higher_than_11mbit = 1;
 816
 817         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 818             have_higher_than_11mbit)
 819                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 820         else
 821                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 822
 823         ieee80211_set_wmm_default(sdata);
 824 }
 825
 826 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 827                               enum ieee80211_band band)
 828 {
 829         struct ieee80211_supported_band *sband;
 830         struct ieee80211_rate *bitrates;
 831         u32 mandatory_rates;
 832         enum ieee80211_rate_flags mandatory_flag;
 833         int i;
 834
 835         sband = local->hw.wiphy->bands[band];
 836         if (!sband) {
 837                 WARN_ON(1);
 838                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 839         }
 840
 841         if (band == IEEE80211_BAND_2GHZ)
 842                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 843         else
 844                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 845
 846         bitrates = sband->bitrates;
 847         mandatory_rates = 0;
 848         for (i = 0; i < sband->n_bitrates; i++)
 849                 if (bitrates[i].flags & mandatory_flag)
 850                         mandatory_rates |= BIT(i);
 851         return mandatory_rates;
 852 }
 853
 854 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 855                          u16 transaction, u16 auth_alg,
 856                          u8 *extra, size_t extra_len, const u8 *bssid,
 857                          const u8 *key, u8 key_len, u8 key_idx)
 858 {
 859         struct ieee80211_local *local = sdata->local;
 860         struct sk_buff *skb;
 861         struct ieee80211_mgmt *mgmt;
 862         int err;
 863
 864         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 865                             sizeof(*mgmt) + 6 + extra_len);
 866         if (!skb) {
 867                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 868                        "frame\n", sdata->name);
 869                 return;
 870         }
 871         skb_reserve(skb, local->hw.extra_tx_headroom);
 872
 873         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 874         memset(mgmt, 0, 24 + 6);
 875         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 876                                           IEEE80211_STYPE_AUTH);
 877         memcpy(mgmt->da, bssid, ETH_ALEN);
 878         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 879         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 880         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 881         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 882         mgmt->u.auth.status_code = cpu_to_le16(0);
 883         if (extra)
 884                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 885
 886         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 887                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 888                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 889                 WARN_ON(err);
 890         }
 891
 892         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 893         ieee80211_tx_skb(sdata, skb);
 894 }
 895
 896 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 897                              const u8 *ie, size_t ie_len,
 898                              enum ieee80211_band band, u32 rate_mask,
 899                              u8 channel)
 900 {
 901         struct ieee80211_supported_band *sband;
 902         u8 *pos;
 903         size_t offset = 0, noffset;
 904         int supp_rates_len, i;
 905         u8 rates[32];
 906         int num_rates;
 907         int ext_rates_len;
 908
 909         sband = local->hw.wiphy->bands[band];
 910
 911         pos = buffer;
 912
 913         num_rates = 0;
 914         for (i = 0; i < sband->n_bitrates; i++) {
 915                 if ((BIT(i) & rate_mask) == 0)
 916                         continue; /* skip rate */
 917                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
 918         }
 919
 920         supp_rates_len = min_t(int, num_rates, 8);
 921
 922         *pos++ = WLAN_EID_SUPP_RATES;
 923         *pos++ = supp_rates_len;
 924         memcpy(pos, rates, supp_rates_len);
 925         pos += supp_rates_len;
 926
 927         /* insert "request information" if in custom IEs */
 928         if (ie && ie_len) {
 929                 static const u8 before_extrates[] = {
 930                         WLAN_EID_SSID,
 931                         WLAN_EID_SUPP_RATES,
 932                         WLAN_EID_REQUEST,
 933                 };
 934                 noffset = ieee80211_ie_split(ie, ie_len,
 935                                              before_extrates,
 936                                              ARRAY_SIZE(before_extrates),
 937                                              offset);
 938                 memcpy(pos, ie + offset, noffset - offset);
 939                 pos += noffset - offset;
 940                 offset = noffset;
 941         }
 942
 943         ext_rates_len = num_rates - supp_rates_len;
 944         if (ext_rates_len > 0) {
 945                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 946                 *pos++ = ext_rates_len;
 947                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
 948                 pos += ext_rates_len;
 949         }
 950
 951         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
 952                 *pos++ = WLAN_EID_DS_PARAMS;
 953                 *pos++ = 1;
 954                 *pos++ = channel;
 955         }
 956
 957         /* insert custom IEs that go before HT */
 958         if (ie && ie_len) {
 959                 static const u8 before_ht[] = {
 960                         WLAN_EID_SSID,
 961                         WLAN_EID_SUPP_RATES,
 962                         WLAN_EID_REQUEST,
 963                         WLAN_EID_EXT_SUPP_RATES,
 964                         WLAN_EID_DS_PARAMS,
 965                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 966                 };
 967                 noffset = ieee80211_ie_split(ie, ie_len,
 968                                              before_ht, ARRAY_SIZE(before_ht),
 969                                              offset);
 970                 memcpy(pos, ie + offset, noffset - offset);
 971                 pos += noffset - offset;
 972                 offset = noffset;
 973         }
 974
 975         if (sband->ht_cap.ht_supported) {
 976                 u16 cap = sband->ht_cap.cap;
 977                 __le16 tmp;
 978
 979                 if (ieee80211_disable_40mhz_24ghz &&
 980                     sband->band == IEEE80211_BAND_2GHZ) {
 981                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 982                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 983                 }
 984
 985                 *pos++ = WLAN_EID_HT_CAPABILITY;
 986                 *pos++ = sizeof(struct ieee80211_ht_cap);
 987                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 988                 tmp = cpu_to_le16(cap);
 989                 memcpy(pos, &tmp, sizeof(u16));
 990                 pos += sizeof(u16);
 991                 *pos++ = sband->ht_cap.ampdu_factor |
 992                          (sband->ht_cap.ampdu_density <<
 993                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
 994                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 995                 pos += sizeof(sband->ht_cap.mcs);
 996                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 997         }
 998
 999         /*
1000          * If adding more here, adjust code in main.c
1001          * that calculates local->scan_ies_len.
1002          */
1003
1004         /* add any remaining custom IEs */
1005         if (ie && ie_len) {
1006                 noffset = ie_len;
1007                 memcpy(pos, ie + offset, noffset - offset);
1008                 pos += noffset - offset;
1009         }
1010
1011         return pos - buffer;
1012 }
1013
1014 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1015                               const u8 *ssid, size_t ssid_len,
1016                               const u8 *ie, size_t ie_len)
1017 {
1018         struct ieee80211_local *local = sdata->local;
1019         struct sk_buff *skb;
1020         struct ieee80211_mgmt *mgmt;
1021         size_t buf_len;
1022         u8 *buf;
1023         u8 chan;
1024
1025         /* FIXME: come up with a proper value */
1026         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1027         if (!buf) {
1028                 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1029                        "buffer\n", sdata->name);
1030                 return;
1031         }
1032
1033         chan = ieee80211_frequency_to_channel(
1034                 local->hw.conf.channel->center_freq);
1035
1036         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1037                                            local->hw.conf.channel->band,
1038                                            sdata->rc_rateidx_mask
1039                                            [local->hw.conf.channel->band],
1040                                            chan);
1041
1042         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1043                                      ssid, ssid_len,
1044                                      buf, buf_len);
1045
1046         if (dst) {
1047                 mgmt = (struct ieee80211_mgmt *) skb->data;
1048                 memcpy(mgmt->da, dst, ETH_ALEN);
1049                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1050         }
1051
1052         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1053         ieee80211_tx_skb(sdata, skb);
1054         kfree(buf);
1055 }
1056
1057 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1058                             struct ieee802_11_elems *elems,
1059                             enum ieee80211_band band)
1060 {
1061         struct ieee80211_supported_band *sband;
1062         struct ieee80211_rate *bitrates;
1063         size_t num_rates;
1064         u32 supp_rates;
1065         int i, j;
1066         sband = local->hw.wiphy->bands[band];
1067
1068         if (!sband) {
1069                 WARN_ON(1);
1070                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1071         }
1072
1073         bitrates = sband->bitrates;
1074         num_rates = sband->n_bitrates;
1075         supp_rates = 0;
1076         for (i = 0; i < elems->supp_rates_len +
1077                      elems->ext_supp_rates_len; i++) {
1078                 u8 rate = 0;
1079                 int own_rate;
1080                 if (i < elems->supp_rates_len)
1081                         rate = elems->supp_rates[i];
1082                 else if (elems->ext_supp_rates)
1083                         rate = elems->ext_supp_rates
1084                                 [i - elems->supp_rates_len];
1085                 own_rate = 5 * (rate & 0x7f);
1086                 for (j = 0; j < num_rates; j++)
1087                         if (bitrates[j].bitrate == own_rate)
1088                                 supp_rates |= BIT(j);
1089         }
1090         return supp_rates;
1091 }
1092
1093 void ieee80211_stop_device(struct ieee80211_local *local)
1094 {
1095         ieee80211_led_radio(local, false);
1096
1097         cancel_work_sync(&local->reconfig_filter);
1098
1099         flush_workqueue(local->workqueue);
1100         drv_stop(local);
1101 }
1102
1103 int ieee80211_reconfig(struct ieee80211_local *local)
1104 {
1105         struct ieee80211_hw *hw = &local->hw;
1106         struct ieee80211_sub_if_data *sdata;
1107         struct sta_info *sta;
1108         int res;
1109
1110         if (local->suspended)
1111                 local->resuming = true;
1112
1113         /* restart hardware */
1114         if (local->open_count) {
1115                 /*
1116                  * Upon resume hardware can sometimes be goofy due to
1117                  * various platform / driver / bus issues, so restarting
1118                  * the device may at times not work immediately. Propagate
1119                  * the error.
1120                  */
1121                 res = drv_start(local);
1122                 if (res) {
1123                         WARN(local->suspended, "Hardware became unavailable "
1124                              "upon resume. This could be a software issue "
1125                              "prior to suspend or a hardware issue.\n");
1126                         return res;
1127                 }
1128
1129                 ieee80211_led_radio(local, true);
1130         }
1131
1132         /* add interfaces */
1133         list_for_each_entry(sdata, &local->interfaces, list) {
1134                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1135                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1136                     ieee80211_sdata_running(sdata))
1137                         res = drv_add_interface(local, &sdata->vif);
1138         }
1139
1140         /* add STAs back */
1141         mutex_lock(&local->sta_mtx);
1142         list_for_each_entry(sta, &local->sta_list, list) {
1143                 if (sta->uploaded) {
1144                         sdata = sta->sdata;
1145                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1146                                 sdata = container_of(sdata->bss,
1147                                              struct ieee80211_sub_if_data,
1148                                              u.ap);
1149
1150                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1151                 }
1152         }
1153         mutex_unlock(&local->sta_mtx);
1154
1155         /* setup RTS threshold */
1156         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1157
1158         /* reconfigure hardware */
1159         ieee80211_hw_config(local, ~0);
1160
1161         ieee80211_configure_filter(local);
1162
1163         /* Finally also reconfigure all the BSS information */
1164         list_for_each_entry(sdata, &local->interfaces, list) {
1165                 u32 changed;
1166
1167                 if (!ieee80211_sdata_running(sdata))
1168                         continue;
1169
1170                 /* common change flags for all interface types */
1171                 changed = BSS_CHANGED_ERP_CTS_PROT |
1172                           BSS_CHANGED_ERP_PREAMBLE |
1173                           BSS_CHANGED_ERP_SLOT |
1174                           BSS_CHANGED_HT |
1175                           BSS_CHANGED_BASIC_RATES |
1176                           BSS_CHANGED_BEACON_INT |
1177                           BSS_CHANGED_BSSID |
1178                           BSS_CHANGED_CQM |
1179                           BSS_CHANGED_QOS;
1180
1181                 switch (sdata->vif.type) {
1182                 case NL80211_IFTYPE_STATION:
1183                         changed |= BSS_CHANGED_ASSOC;
1184                         ieee80211_bss_info_change_notify(sdata, changed);
1185                         break;
1186                 case NL80211_IFTYPE_ADHOC:
1187                         changed |= BSS_CHANGED_IBSS;
1188                         /* fall through */
1189                 case NL80211_IFTYPE_AP:
1190                 case NL80211_IFTYPE_MESH_POINT:
1191                         changed |= BSS_CHANGED_BEACON |
1192                                    BSS_CHANGED_BEACON_ENABLED;
1193                         ieee80211_bss_info_change_notify(sdata, changed);
1194                         break;
1195                 case NL80211_IFTYPE_WDS:
1196                         break;
1197                 case NL80211_IFTYPE_AP_VLAN:
1198                 case NL80211_IFTYPE_MONITOR:
1199                         /* ignore virtual */
1200                         break;
1201                 case NL80211_IFTYPE_UNSPECIFIED:
1202                 case NUM_NL80211_IFTYPES:
1203                 case NL80211_IFTYPE_P2P_CLIENT:
1204                 case NL80211_IFTYPE_P2P_GO:
1205                         WARN_ON(1);
1206                         break;
1207                 }
1208         }
1209
1210         /*
1211          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1212          * sessions can be established after a resume.
1213          *
1214          * Also tear down aggregation sessions since reconfiguring
1215          * them in a hardware restart scenario is not easily done
1216          * right now, and the hardware will have lost information
1217          * about the sessions, but we and the AP still think they
1218          * are active. This is really a workaround though.
1219          */
1220         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1221                 mutex_lock(&local->sta_mtx);
1222
1223                 list_for_each_entry(sta, &local->sta_list, list) {
1224                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1225                         clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1226                 }
1227
1228                 mutex_unlock(&local->sta_mtx);
1229         }
1230
1231         /* add back keys */
1232         list_for_each_entry(sdata, &local->interfaces, list)
1233                 if (ieee80211_sdata_running(sdata))
1234                         ieee80211_enable_keys(sdata);
1235
1236         ieee80211_wake_queues_by_reason(hw,
1237                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1238
1239         /*
1240          * If this is for hw restart things are still running.
1241          * We may want to change that later, however.
1242          */
1243         if (!local->suspended)
1244                 return 0;
1245
1246 #ifdef CONFIG_PM
1247         /* first set suspended false, then resuming */
1248         local->suspended = false;
1249         mb();
1250         local->resuming = false;
1251
1252         list_for_each_entry(sdata, &local->interfaces, list) {
1253                 switch(sdata->vif.type) {
1254                 case NL80211_IFTYPE_STATION:
1255                         ieee80211_sta_restart(sdata);
1256                         break;
1257                 case NL80211_IFTYPE_ADHOC:
1258                         ieee80211_ibss_restart(sdata);
1259                         break;
1260                 case NL80211_IFTYPE_MESH_POINT:
1261                         ieee80211_mesh_restart(sdata);
1262                         break;
1263                 default:
1264                         break;
1265                 }
1266         }
1267
1268         add_timer(&local->sta_cleanup);
1269
1270         mutex_lock(&local->sta_mtx);
1271         list_for_each_entry(sta, &local->sta_list, list)
1272                 mesh_plink_restart(sta);
1273         mutex_unlock(&local->sta_mtx);
1274 #else
1275         WARN_ON(1);
1276 #endif
1277         return 0;
1278 }
1279
1280 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1281                           enum ieee80211_smps_mode *smps_mode)
1282 {
1283         if (ifmgd->associated) {
1284                 *smps_mode = ifmgd->ap_smps;
1285
1286                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1287                         if (ifmgd->powersave)
1288                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1289                         else
1290                                 *smps_mode = IEEE80211_SMPS_OFF;
1291                 }
1292
1293                 return 1;
1294         }
1295
1296         return 0;
1297 }
1298
1299 /* must hold iflist_mtx */
1300 void ieee80211_recalc_smps(struct ieee80211_local *local)
1301 {
1302         struct ieee80211_sub_if_data *sdata;
1303         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1304         int count = 0;
1305
1306         lockdep_assert_held(&local->iflist_mtx);
1307
1308         /*
1309          * This function could be improved to handle multiple
1310          * interfaces better, but right now it makes any
1311          * non-station interfaces force SM PS to be turned
1312          * off. If there are multiple station interfaces it
1313          * could also use the best possible mode, e.g. if
1314          * one is in static and the other in dynamic then
1315          * dynamic is ok.
1316          */
1317
1318         list_for_each_entry(sdata, &local->interfaces, list) {
1319                 if (!ieee80211_sdata_running(sdata))
1320                         continue;
1321                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1322                         goto set;
1323
1324                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1325
1326                 if (count > 1) {
1327                         smps_mode = IEEE80211_SMPS_OFF;
1328                         break;
1329                 }
1330         }
1331
1332         if (smps_mode == local->smps_mode)
1333                 return;
1334
1335  set:
1336         local->smps_mode = smps_mode;
1337         /* changed flag is auto-detected for this */
1338         ieee80211_hw_config(local, 0);
1339 }
1340
1341 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1342 {
1343         int i;
1344
1345         for (i = 0; i < n_ids; i++)
1346                 if (ids[i] == id)
1347                         return true;
1348         return false;
1349 }
1350
1351 /**
1352  * ieee80211_ie_split - split an IE buffer according to ordering
1353  *
1354  * @ies: the IE buffer
1355  * @ielen: the length of the IE buffer
1356  * @ids: an array with element IDs that are allowed before
1357  *      the split
1358  * @n_ids: the size of the element ID array
1359  * @offset: offset where to start splitting in the buffer
1360  *
1361  * This function splits an IE buffer by updating the @offset
1362  * variable to point to the location where the buffer should be
1363  * split.
1364  *
1365  * It assumes that the given IE buffer is well-formed, this
1366  * has to be guaranteed by the caller!
1367  *
1368  * It also assumes that the IEs in the buffer are ordered
1369  * correctly, if not the result of using this function will not
1370  * be ordered correctly either, i.e. it does no reordering.
1371  *
1372  * The function returns the offset where the next part of the
1373  * buffer starts, which may be @ielen if the entire (remainder)
1374  * of the buffer should be used.
1375  */
1376 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1377                           const u8 *ids, int n_ids, size_t offset)
1378 {
1379         size_t pos = offset;
1380
1381         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1382                 pos += 2 + ies[pos + 1];
1383
1384         return pos;
1385 }
1386
1387 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1388 {
1389         size_t pos = offset;
1390
1391         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1392                 pos += 2 + ies[pos + 1];
1393
1394         return pos;
1395 }