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 NUM_NL80211_IFTYPES:
 478                 case NL80211_IFTYPE_UNSPECIFIED:
 479                 case NL80211_IFTYPE_MONITOR:
 480                 case NL80211_IFTYPE_AP_VLAN:
 481                         continue;
 482                 case NL80211_IFTYPE_AP:
 483                 case NL80211_IFTYPE_STATION:
 484                 case NL80211_IFTYPE_ADHOC:
 485                 case NL80211_IFTYPE_WDS:
 486                 case NL80211_IFTYPE_MESH_POINT:
 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 NUM_NL80211_IFTYPES:
 512                 case NL80211_IFTYPE_UNSPECIFIED:
 513                 case NL80211_IFTYPE_MONITOR:
 514                 case NL80211_IFTYPE_AP_VLAN:
 515                         continue;
 516                 case NL80211_IFTYPE_AP:
 517                 case NL80211_IFTYPE_STATION:
 518                 case NL80211_IFTYPE_ADHOC:
 519                 case NL80211_IFTYPE_WDS:
 520                 case NL80211_IFTYPE_MESH_POINT:
 521                         break;
 522                 }
 523                 if (ieee80211_sdata_running(sdata))
 524                         iterator(data, sdata->vif.addr,
 525                                  &sdata->vif);
 526         }
 527
 528         rcu_read_unlock();
 529 }
 530 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 531
 532 /*
 533  * Nothing should have been stuffed into the workqueue during
 534  * the suspend->resume cycle. If this WARN is seen then there
 535  * is a bug with either the driver suspend or something in
 536  * mac80211 stuffing into the workqueue which we haven't yet
 537  * cleared during mac80211's suspend cycle.
 538  */
 539 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 540 {
 541         if (WARN(local->suspended && !local->resuming,
 542                  "queueing ieee80211 work while going to suspend\n"))
 543                 return false;
 544
 545         return true;
 546 }
 547
 548 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 549 {
 550         struct ieee80211_local *local = hw_to_local(hw);
 551
 552         if (!ieee80211_can_queue_work(local))
 553                 return;
 554
 555         queue_work(local->workqueue, work);
 556 }
 557 EXPORT_SYMBOL(ieee80211_queue_work);
 558
 559 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 560                                   struct delayed_work *dwork,
 561                                   unsigned long delay)
 562 {
 563         struct ieee80211_local *local = hw_to_local(hw);
 564
 565         if (!ieee80211_can_queue_work(local))
 566                 return;
 567
 568         queue_delayed_work(local->workqueue, dwork, delay);
 569 }
 570 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 571
 572 void ieee802_11_parse_elems(u8 *start, size_t len,
 573                             struct ieee802_11_elems *elems)
 574 {
 575         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 576 }
 577
 578 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 579                                struct ieee802_11_elems *elems,
 580                                u64 filter, u32 crc)
 581 {
 582         size_t left = len;
 583         u8 *pos = start;
 584         bool calc_crc = filter != 0;
 585
 586         memset(elems, 0, sizeof(*elems));
 587         elems->ie_start = start;
 588         elems->total_len = len;
 589
 590         while (left >= 2) {
 591                 u8 id, elen;
 592
 593                 id = *pos++;
 594                 elen = *pos++;
 595                 left -= 2;
 596
 597                 if (elen > left)
 598                         break;
 599
 600                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 601                         crc = crc32_be(crc, pos - 2, elen + 2);
 602
 603                 switch (id) {
 604                 case WLAN_EID_SSID:
 605                         elems->ssid = pos;
 606                         elems->ssid_len = elen;
 607                         break;
 608                 case WLAN_EID_SUPP_RATES:
 609                         elems->supp_rates = pos;
 610                         elems->supp_rates_len = elen;
 611                         break;
 612                 case WLAN_EID_FH_PARAMS:
 613                         elems->fh_params = pos;
 614                         elems->fh_params_len = elen;
 615                         break;
 616                 case WLAN_EID_DS_PARAMS:
 617                         elems->ds_params = pos;
 618                         elems->ds_params_len = elen;
 619                         break;
 620                 case WLAN_EID_CF_PARAMS:
 621                         elems->cf_params = pos;
 622                         elems->cf_params_len = elen;
 623                         break;
 624                 case WLAN_EID_TIM:
 625                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 626                                 elems->tim = (void *)pos;
 627                                 elems->tim_len = elen;
 628                         }
 629                         break;
 630                 case WLAN_EID_IBSS_PARAMS:
 631                         elems->ibss_params = pos;
 632                         elems->ibss_params_len = elen;
 633                         break;
 634                 case WLAN_EID_CHALLENGE:
 635                         elems->challenge = pos;
 636                         elems->challenge_len = elen;
 637                         break;
 638                 case WLAN_EID_VENDOR_SPECIFIC:
 639                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 640                             pos[2] == 0xf2) {
 641                                 /* Microsoft OUI (00:50:F2) */
 642
 643                                 if (calc_crc)
 644                                         crc = crc32_be(crc, pos - 2, elen + 2);
 645
 646                                 if (pos[3] == 1) {
 647                                         /* OUI Type 1 - WPA IE */
 648                                         elems->wpa = pos;
 649                                         elems->wpa_len = elen;
 650                                 } else if (elen >= 5 && pos[3] == 2) {
 651                                         /* OUI Type 2 - WMM IE */
 652                                         if (pos[4] == 0) {
 653                                                 elems->wmm_info = pos;
 654                                                 elems->wmm_info_len = elen;
 655                                         } else if (pos[4] == 1) {
 656                                                 elems->wmm_param = pos;
 657                                                 elems->wmm_param_len = elen;
 658                                         }
 659                                 }
 660                         }
 661                         break;
 662                 case WLAN_EID_RSN:
 663                         elems->rsn = pos;
 664                         elems->rsn_len = elen;
 665                         break;
 666                 case WLAN_EID_ERP_INFO:
 667                         elems->erp_info = pos;
 668                         elems->erp_info_len = elen;
 669                         break;
 670                 case WLAN_EID_EXT_SUPP_RATES:
 671                         elems->ext_supp_rates = pos;
 672                         elems->ext_supp_rates_len = elen;
 673                         break;
 674                 case WLAN_EID_HT_CAPABILITY:
 675                         if (elen >= sizeof(struct ieee80211_ht_cap))
 676                                 elems->ht_cap_elem = (void *)pos;
 677                         break;
 678                 case WLAN_EID_HT_INFORMATION:
 679                         if (elen >= sizeof(struct ieee80211_ht_info))
 680                                 elems->ht_info_elem = (void *)pos;
 681                         break;
 682                 case WLAN_EID_MESH_ID:
 683                         elems->mesh_id = pos;
 684                         elems->mesh_id_len = elen;
 685                         break;
 686                 case WLAN_EID_MESH_CONFIG:
 687                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 688                                 elems->mesh_config = (void *)pos;
 689                         break;
 690                 case WLAN_EID_PEER_LINK:
 691                         elems->peer_link = pos;
 692                         elems->peer_link_len = elen;
 693                         break;
 694                 case WLAN_EID_PREQ:
 695                         elems->preq = pos;
 696                         elems->preq_len = elen;
 697                         break;
 698                 case WLAN_EID_PREP:
 699                         elems->prep = pos;
 700                         elems->prep_len = elen;
 701                         break;
 702                 case WLAN_EID_PERR:
 703                         elems->perr = pos;
 704                         elems->perr_len = elen;
 705                         break;
 706                 case WLAN_EID_RANN:
 707                         if (elen >= sizeof(struct ieee80211_rann_ie))
 708                                 elems->rann = (void *)pos;
 709                         break;
 710                 case WLAN_EID_CHANNEL_SWITCH:
 711                         elems->ch_switch_elem = pos;
 712                         elems->ch_switch_elem_len = elen;
 713                         break;
 714                 case WLAN_EID_QUIET:
 715                         if (!elems->quiet_elem) {
 716                                 elems->quiet_elem = pos;
 717                                 elems->quiet_elem_len = elen;
 718                         }
 719                         elems->num_of_quiet_elem++;
 720                         break;
 721                 case WLAN_EID_COUNTRY:
 722                         elems->country_elem = pos;
 723                         elems->country_elem_len = elen;
 724                         break;
 725                 case WLAN_EID_PWR_CONSTRAINT:
 726                         elems->pwr_constr_elem = pos;
 727                         elems->pwr_constr_elem_len = elen;
 728                         break;
 729                 case WLAN_EID_TIMEOUT_INTERVAL:
 730                         elems->timeout_int = pos;
 731                         elems->timeout_int_len = elen;
 732                         break;
 733                 default:
 734                         break;
 735                 }
 736
 737                 left -= elen;
 738                 pos += elen;
 739         }
 740
 741         return crc;
 742 }
 743
 744 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 745 {
 746         struct ieee80211_local *local = sdata->local;
 747         struct ieee80211_tx_queue_params qparam;
 748         int queue;
 749         bool use_11b;
 750         int aCWmin, aCWmax;
 751
 752         if (!local->ops->conf_tx)
 753                 return;
 754
 755         memset(&qparam, 0, sizeof(qparam));
 756
 757         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 758                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 759
 760         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 761                 /* Set defaults according to 802.11-2007 Table 7-37 */
 762                 aCWmax = 1023;
 763                 if (use_11b)
 764                         aCWmin = 31;
 765                 else
 766                         aCWmin = 15;
 767
 768                 switch (queue) {
 769                 case 3: /* AC_BK */
 770                         qparam.cw_max = aCWmax;
 771                         qparam.cw_min = aCWmin;
 772                         qparam.txop = 0;
 773                         qparam.aifs = 7;
 774                         break;
 775                 default: /* never happens but let's not leave undefined */
 776                 case 2: /* AC_BE */
 777                         qparam.cw_max = aCWmax;
 778                         qparam.cw_min = aCWmin;
 779                         qparam.txop = 0;
 780                         qparam.aifs = 3;
 781                         break;
 782                 case 1: /* AC_VI */
 783                         qparam.cw_max = aCWmin;
 784                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 785                         if (use_11b)
 786                                 qparam.txop = 6016/32;
 787                         else
 788                                 qparam.txop = 3008/32;
 789                         qparam.aifs = 2;
 790                         break;
 791                 case 0: /* AC_VO */
 792                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 793                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 794                         if (use_11b)
 795                                 qparam.txop = 3264/32;
 796                         else
 797                                 qparam.txop = 1504/32;
 798                         qparam.aifs = 2;
 799                         break;
 800                 }
 801
 802                 qparam.uapsd = false;
 803
 804                 drv_conf_tx(local, queue, &qparam);
 805         }
 806
 807         /* after reinitialize QoS TX queues setting to default,
 808          * disable QoS at all */
 809
 810         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 811                 sdata->vif.bss_conf.qos =
 812                         sdata->vif.type != NL80211_IFTYPE_STATION;
 813                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 814         }
 815 }
 816
 817 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 818                                   const size_t supp_rates_len,
 819                                   const u8 *supp_rates)
 820 {
 821         struct ieee80211_local *local = sdata->local;
 822         int i, have_higher_than_11mbit = 0;
 823
 824         /* cf. IEEE 802.11 9.2.12 */
 825         for (i = 0; i < supp_rates_len; i++)
 826                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 827                         have_higher_than_11mbit = 1;
 828
 829         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 830             have_higher_than_11mbit)
 831                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 832         else
 833                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 834
 835         ieee80211_set_wmm_default(sdata);
 836 }
 837
 838 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 839                               enum ieee80211_band band)
 840 {
 841         struct ieee80211_supported_band *sband;
 842         struct ieee80211_rate *bitrates;
 843         u32 mandatory_rates;
 844         enum ieee80211_rate_flags mandatory_flag;
 845         int i;
 846
 847         sband = local->hw.wiphy->bands[band];
 848         if (!sband) {
 849                 WARN_ON(1);
 850                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 851         }
 852
 853         if (band == IEEE80211_BAND_2GHZ)
 854                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 855         else
 856                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 857
 858         bitrates = sband->bitrates;
 859         mandatory_rates = 0;
 860         for (i = 0; i < sband->n_bitrates; i++)
 861                 if (bitrates[i].flags & mandatory_flag)
 862                         mandatory_rates |= BIT(i);
 863         return mandatory_rates;
 864 }
 865
 866 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 867                          u16 transaction, u16 auth_alg,
 868                          u8 *extra, size_t extra_len, const u8 *bssid,
 869                          const u8 *key, u8 key_len, u8 key_idx)
 870 {
 871         struct ieee80211_local *local = sdata->local;
 872         struct sk_buff *skb;
 873         struct ieee80211_mgmt *mgmt;
 874         int err;
 875
 876         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 877                             sizeof(*mgmt) + 6 + extra_len);
 878         if (!skb) {
 879                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 880                        "frame\n", sdata->name);
 881                 return;
 882         }
 883         skb_reserve(skb, local->hw.extra_tx_headroom);
 884
 885         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 886         memset(mgmt, 0, 24 + 6);
 887         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 888                                           IEEE80211_STYPE_AUTH);
 889         memcpy(mgmt->da, bssid, ETH_ALEN);
 890         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 891         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 892         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 893         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 894         mgmt->u.auth.status_code = cpu_to_le16(0);
 895         if (extra)
 896                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 897
 898         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 899                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 900                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 901                 WARN_ON(err);
 902         }
 903
 904         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 905         ieee80211_tx_skb(sdata, skb);
 906 }
 907
 908 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 909                              const u8 *ie, size_t ie_len,
 910                              enum ieee80211_band band)
 911 {
 912         struct ieee80211_supported_band *sband;
 913         u8 *pos;
 914         size_t offset = 0, noffset;
 915         int supp_rates_len, i;
 916
 917         sband = local->hw.wiphy->bands[band];
 918
 919         pos = buffer;
 920
 921         supp_rates_len = min_t(int, sband->n_bitrates, 8);
 922
 923         *pos++ = WLAN_EID_SUPP_RATES;
 924         *pos++ = supp_rates_len;
 925
 926         for (i = 0; i < supp_rates_len; i++) {
 927                 int rate = sband->bitrates[i].bitrate;
 928                 *pos++ = (u8) (rate / 5);
 929         }
 930
 931         /* insert "request information" if in custom IEs */
 932         if (ie && ie_len) {
 933                 static const u8 before_extrates[] = {
 934                         WLAN_EID_SSID,
 935                         WLAN_EID_SUPP_RATES,
 936                         WLAN_EID_REQUEST,
 937                 };
 938                 noffset = ieee80211_ie_split(ie, ie_len,
 939                                              before_extrates,
 940                                              ARRAY_SIZE(before_extrates),
 941                                              offset);
 942                 memcpy(pos, ie + offset, noffset - offset);
 943                 pos += noffset - offset;
 944                 offset = noffset;
 945         }
 946
 947         if (sband->n_bitrates > i) {
 948                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 949                 *pos++ = sband->n_bitrates - i;
 950
 951                 for (; i < sband->n_bitrates; i++) {
 952                         int rate = sband->bitrates[i].bitrate;
 953                         *pos++ = (u8) (rate / 5);
 954                 }
 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
1024         /* FIXME: come up with a proper value */
1025         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1026         if (!buf) {
1027                 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1028                        "buffer\n", sdata->name);
1029                 return;
1030         }
1031
1032         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1033                                            local->hw.conf.channel->band);
1034
1035         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1036                                      ssid, ssid_len,
1037                                      buf, buf_len);
1038
1039         if (dst) {
1040                 mgmt = (struct ieee80211_mgmt *) skb->data;
1041                 memcpy(mgmt->da, dst, ETH_ALEN);
1042                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1043         }
1044
1045         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1046         ieee80211_tx_skb(sdata, skb);
1047         kfree(buf);
1048 }
1049
1050 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1051                             struct ieee802_11_elems *elems,
1052                             enum ieee80211_band band)
1053 {
1054         struct ieee80211_supported_band *sband;
1055         struct ieee80211_rate *bitrates;
1056         size_t num_rates;
1057         u32 supp_rates;
1058         int i, j;
1059         sband = local->hw.wiphy->bands[band];
1060
1061         if (!sband) {
1062                 WARN_ON(1);
1063                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1064         }
1065
1066         bitrates = sband->bitrates;
1067         num_rates = sband->n_bitrates;
1068         supp_rates = 0;
1069         for (i = 0; i < elems->supp_rates_len +
1070                      elems->ext_supp_rates_len; i++) {
1071                 u8 rate = 0;
1072                 int own_rate;
1073                 if (i < elems->supp_rates_len)
1074                         rate = elems->supp_rates[i];
1075                 else if (elems->ext_supp_rates)
1076                         rate = elems->ext_supp_rates
1077                                 [i - elems->supp_rates_len];
1078                 own_rate = 5 * (rate & 0x7f);
1079                 for (j = 0; j < num_rates; j++)
1080                         if (bitrates[j].bitrate == own_rate)
1081                                 supp_rates |= BIT(j);
1082         }
1083         return supp_rates;
1084 }
1085
1086 void ieee80211_stop_device(struct ieee80211_local *local)
1087 {
1088         ieee80211_led_radio(local, false);
1089
1090         cancel_work_sync(&local->reconfig_filter);
1091
1092         flush_workqueue(local->workqueue);
1093         drv_stop(local);
1094 }
1095
1096 int ieee80211_reconfig(struct ieee80211_local *local)
1097 {
1098         struct ieee80211_hw *hw = &local->hw;
1099         struct ieee80211_sub_if_data *sdata;
1100         struct sta_info *sta;
1101         int res;
1102
1103         if (local->suspended)
1104                 local->resuming = true;
1105
1106         /* restart hardware */
1107         if (local->open_count) {
1108                 /*
1109                  * Upon resume hardware can sometimes be goofy due to
1110                  * various platform / driver / bus issues, so restarting
1111                  * the device may at times not work immediately. Propagate
1112                  * the error.
1113                  */
1114                 res = drv_start(local);
1115                 if (res) {
1116                         WARN(local->suspended, "Hardware became unavailable "
1117                              "upon resume. This could be a software issue "
1118                              "prior to suspend or a hardware issue.\n");
1119                         return res;
1120                 }
1121
1122                 ieee80211_led_radio(local, true);
1123         }
1124
1125         /* add interfaces */
1126         list_for_each_entry(sdata, &local->interfaces, list) {
1127                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1128                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1129                     ieee80211_sdata_running(sdata))
1130                         res = drv_add_interface(local, &sdata->vif);
1131         }
1132
1133         /* add STAs back */
1134         mutex_lock(&local->sta_mtx);
1135         list_for_each_entry(sta, &local->sta_list, list) {
1136                 if (sta->uploaded) {
1137                         sdata = sta->sdata;
1138                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1139                                 sdata = container_of(sdata->bss,
1140                                              struct ieee80211_sub_if_data,
1141                                              u.ap);
1142
1143                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1144                 }
1145         }
1146         mutex_unlock(&local->sta_mtx);
1147
1148         /* setup RTS threshold */
1149         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1150
1151         /* reconfigure hardware */
1152         ieee80211_hw_config(local, ~0);
1153
1154         ieee80211_configure_filter(local);
1155
1156         /* Finally also reconfigure all the BSS information */
1157         list_for_each_entry(sdata, &local->interfaces, list) {
1158                 u32 changed;
1159
1160                 if (!ieee80211_sdata_running(sdata))
1161                         continue;
1162
1163                 /* common change flags for all interface types */
1164                 changed = BSS_CHANGED_ERP_CTS_PROT |
1165                           BSS_CHANGED_ERP_PREAMBLE |
1166                           BSS_CHANGED_ERP_SLOT |
1167                           BSS_CHANGED_HT |
1168                           BSS_CHANGED_BASIC_RATES |
1169                           BSS_CHANGED_BEACON_INT |
1170                           BSS_CHANGED_BSSID |
1171                           BSS_CHANGED_CQM |
1172                           BSS_CHANGED_QOS;
1173
1174                 switch (sdata->vif.type) {
1175                 case NL80211_IFTYPE_STATION:
1176                         changed |= BSS_CHANGED_ASSOC;
1177                         ieee80211_bss_info_change_notify(sdata, changed);
1178                         break;
1179                 case NL80211_IFTYPE_ADHOC:
1180                         changed |= BSS_CHANGED_IBSS;
1181                         /* fall through */
1182                 case NL80211_IFTYPE_AP:
1183                 case NL80211_IFTYPE_MESH_POINT:
1184                         changed |= BSS_CHANGED_BEACON |
1185                                    BSS_CHANGED_BEACON_ENABLED;
1186                         ieee80211_bss_info_change_notify(sdata, changed);
1187                         break;
1188                 case NL80211_IFTYPE_WDS:
1189                         break;
1190                 case NL80211_IFTYPE_AP_VLAN:
1191                 case NL80211_IFTYPE_MONITOR:
1192                         /* ignore virtual */
1193                         break;
1194                 case NL80211_IFTYPE_UNSPECIFIED:
1195                 case NUM_NL80211_IFTYPES:
1196                         WARN_ON(1);
1197                         break;
1198                 }
1199         }
1200
1201         /*
1202          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1203          * sessions can be established after a resume.
1204          *
1205          * Also tear down aggregation sessions since reconfiguring
1206          * them in a hardware restart scenario is not easily done
1207          * right now, and the hardware will have lost information
1208          * about the sessions, but we and the AP still think they
1209          * are active. This is really a workaround though.
1210          */
1211         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1212                 mutex_lock(&local->sta_mtx);
1213
1214                 list_for_each_entry(sta, &local->sta_list, list) {
1215                         ieee80211_sta_tear_down_BA_sessions(sta);
1216                         clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1217                 }
1218
1219                 mutex_unlock(&local->sta_mtx);
1220         }
1221
1222         /* add back keys */
1223         list_for_each_entry(sdata, &local->interfaces, list)
1224                 if (ieee80211_sdata_running(sdata))
1225                         ieee80211_enable_keys(sdata);
1226
1227         ieee80211_wake_queues_by_reason(hw,
1228                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1229
1230         /*
1231          * If this is for hw restart things are still running.
1232          * We may want to change that later, however.
1233          */
1234         if (!local->suspended)
1235                 return 0;
1236
1237 #ifdef CONFIG_PM
1238         /* first set suspended false, then resuming */
1239         local->suspended = false;
1240         mb();
1241         local->resuming = false;
1242
1243         list_for_each_entry(sdata, &local->interfaces, list) {
1244                 switch(sdata->vif.type) {
1245                 case NL80211_IFTYPE_STATION:
1246                         ieee80211_sta_restart(sdata);
1247                         break;
1248                 case NL80211_IFTYPE_ADHOC:
1249                         ieee80211_ibss_restart(sdata);
1250                         break;
1251                 case NL80211_IFTYPE_MESH_POINT:
1252                         ieee80211_mesh_restart(sdata);
1253                         break;
1254                 default:
1255                         break;
1256                 }
1257         }
1258
1259         add_timer(&local->sta_cleanup);
1260
1261         mutex_lock(&local->sta_mtx);
1262         list_for_each_entry(sta, &local->sta_list, list)
1263                 mesh_plink_restart(sta);
1264         mutex_unlock(&local->sta_mtx);
1265 #else
1266         WARN_ON(1);
1267 #endif
1268         return 0;
1269 }
1270
1271 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1272                           enum ieee80211_smps_mode *smps_mode)
1273 {
1274         if (ifmgd->associated) {
1275                 *smps_mode = ifmgd->ap_smps;
1276
1277                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1278                         if (ifmgd->powersave)
1279                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1280                         else
1281                                 *smps_mode = IEEE80211_SMPS_OFF;
1282                 }
1283
1284                 return 1;
1285         }
1286
1287         return 0;
1288 }
1289
1290 /* must hold iflist_mtx */
1291 void ieee80211_recalc_smps(struct ieee80211_local *local,
1292                            struct ieee80211_sub_if_data *forsdata)
1293 {
1294         struct ieee80211_sub_if_data *sdata;
1295         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1296         int count = 0;
1297
1298         if (forsdata)
1299                 WARN_ON(!mutex_is_locked(&forsdata->u.mgd.mtx));
1300
1301         WARN_ON(!mutex_is_locked(&local->iflist_mtx));
1302
1303         /*
1304          * This function could be improved to handle multiple
1305          * interfaces better, but right now it makes any
1306          * non-station interfaces force SM PS to be turned
1307          * off. If there are multiple station interfaces it
1308          * could also use the best possible mode, e.g. if
1309          * one is in static and the other in dynamic then
1310          * dynamic is ok.
1311          */
1312
1313         list_for_each_entry(sdata, &local->interfaces, list) {
1314                 if (!ieee80211_sdata_running(sdata))
1315                         continue;
1316                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1317                         goto set;
1318                 if (sdata != forsdata) {
1319                         /*
1320                          * This nested is ok -- we are holding the iflist_mtx
1321                          * so can't get here twice or so. But it's required
1322                          * since normally we acquire it first and then the
1323                          * iflist_mtx.
1324                          */
1325                         mutex_lock_nested(&sdata->u.mgd.mtx, SINGLE_DEPTH_NESTING);
1326                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1327                         mutex_unlock(&sdata->u.mgd.mtx);
1328                 } else
1329                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1330
1331                 if (count > 1) {
1332                         smps_mode = IEEE80211_SMPS_OFF;
1333                         break;
1334                 }
1335         }
1336
1337         if (smps_mode == local->smps_mode)
1338                 return;
1339
1340  set:
1341         local->smps_mode = smps_mode;
1342         /* changed flag is auto-detected for this */
1343         ieee80211_hw_config(local, 0);
1344 }
1345
1346 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1347 {
1348         int i;
1349
1350         for (i = 0; i < n_ids; i++)
1351                 if (ids[i] == id)
1352                         return true;
1353         return false;
1354 }
1355
1356 /**
1357  * ieee80211_ie_split - split an IE buffer according to ordering
1358  *
1359  * @ies: the IE buffer
1360  * @ielen: the length of the IE buffer
1361  * @ids: an array with element IDs that are allowed before
1362  *      the split
1363  * @n_ids: the size of the element ID array
1364  * @offset: offset where to start splitting in the buffer
1365  *
1366  * This function splits an IE buffer by updating the @offset
1367  * variable to point to the location where the buffer should be
1368  * split.
1369  *
1370  * It assumes that the given IE buffer is well-formed, this
1371  * has to be guaranteed by the caller!
1372  *
1373  * It also assumes that the IEs in the buffer are ordered
1374  * correctly, if not the result of using this function will not
1375  * be ordered correctly either, i.e. it does no reordering.
1376  *
1377  * The function returns the offset where the next part of the
1378  * buffer starts, which may be @ielen if the entire (remainder)
1379  * of the buffer should be used.
1380  */
1381 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1382                           const u8 *ids, int n_ids, size_t offset)
1383 {
1384         size_t pos = offset;
1385
1386         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1387                 pos += 2 + ies[pos + 1];
1388
1389         return pos;
1390 }
1391
1392 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1393 {
1394         size_t pos = offset;
1395
1396         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1397                 pos += 2 + ies[pos + 1];
1398
1399         return pos;
1400 }