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                         netif_tx_wake_queue(netdev_get_tx_queue(sdata->dev, queue));
 288                 rcu_read_unlock();
 289         } else
 290                 tasklet_schedule(&local->tx_pending_tasklet);
 291 }
 292
 293 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 294                                     enum queue_stop_reason reason)
 295 {
 296         struct ieee80211_local *local = hw_to_local(hw);
 297         unsigned long flags;
 298
 299         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 300         __ieee80211_wake_queue(hw, queue, reason);
 301         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 302 }
 303
 304 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 305 {
 306         ieee80211_wake_queue_by_reason(hw, queue,
 307                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 308 }
 309 EXPORT_SYMBOL(ieee80211_wake_queue);
 310
 311 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 312                                    enum queue_stop_reason reason)
 313 {
 314         struct ieee80211_local *local = hw_to_local(hw);
 315         struct ieee80211_sub_if_data *sdata;
 316
 317         trace_stop_queue(local, queue, reason);
 318
 319         if (WARN_ON(queue >= hw->queues))
 320                 return;
 321
 322         __set_bit(reason, &local->queue_stop_reasons[queue]);
 323
 324         rcu_read_lock();
 325         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 326                 netif_tx_stop_queue(netdev_get_tx_queue(sdata->dev, queue));
 327         rcu_read_unlock();
 328 }
 329
 330 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 331                                     enum queue_stop_reason reason)
 332 {
 333         struct ieee80211_local *local = hw_to_local(hw);
 334         unsigned long flags;
 335
 336         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 337         __ieee80211_stop_queue(hw, queue, reason);
 338         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 339 }
 340
 341 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 342 {
 343         ieee80211_stop_queue_by_reason(hw, queue,
 344                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 345 }
 346 EXPORT_SYMBOL(ieee80211_stop_queue);
 347
 348 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 349                                struct sk_buff *skb)
 350 {
 351         struct ieee80211_hw *hw = &local->hw;
 352         unsigned long flags;
 353         int queue = skb_get_queue_mapping(skb);
 354         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 355
 356         if (WARN_ON(!info->control.vif)) {
 357                 kfree_skb(skb);
 358                 return;
 359         }
 360
 361         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 362         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 363         __skb_queue_tail(&local->pending[queue], skb);
 364         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 365         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 366 }
 367
 368 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 369                                struct sk_buff_head *skbs)
 370 {
 371         struct ieee80211_hw *hw = &local->hw;
 372         struct sk_buff *skb;
 373         unsigned long flags;
 374         int queue, ret = 0, i;
 375
 376         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 377         for (i = 0; i < hw->queues; i++)
 378                 __ieee80211_stop_queue(hw, i,
 379                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 380
 381         while ((skb = skb_dequeue(skbs))) {
 382                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 383
 384                 if (WARN_ON(!info->control.vif)) {
 385                         kfree_skb(skb);
 386                         continue;
 387                 }
 388
 389                 ret++;
 390                 queue = skb_get_queue_mapping(skb);
 391                 __skb_queue_tail(&local->pending[queue], skb);
 392         }
 393
 394         for (i = 0; i < hw->queues; i++)
 395                 __ieee80211_wake_queue(hw, i,
 396                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 397         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 398
 399         return ret;
 400 }
 401
 402 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 403                                     enum queue_stop_reason reason)
 404 {
 405         struct ieee80211_local *local = hw_to_local(hw);
 406         unsigned long flags;
 407         int i;
 408
 409         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 410
 411         for (i = 0; i < hw->queues; i++)
 412                 __ieee80211_stop_queue(hw, i, reason);
 413
 414         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 415 }
 416
 417 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 418 {
 419         ieee80211_stop_queues_by_reason(hw,
 420                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 421 }
 422 EXPORT_SYMBOL(ieee80211_stop_queues);
 423
 424 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 425 {
 426         struct ieee80211_local *local = hw_to_local(hw);
 427         unsigned long flags;
 428         int ret;
 429
 430         if (WARN_ON(queue >= hw->queues))
 431                 return true;
 432
 433         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 434         ret = !!local->queue_stop_reasons[queue];
 435         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 436         return ret;
 437 }
 438 EXPORT_SYMBOL(ieee80211_queue_stopped);
 439
 440 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 441                                      enum queue_stop_reason reason)
 442 {
 443         struct ieee80211_local *local = hw_to_local(hw);
 444         unsigned long flags;
 445         int i;
 446
 447         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 448
 449         for (i = 0; i < hw->queues; i++)
 450                 __ieee80211_wake_queue(hw, i, reason);
 451
 452         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 453 }
 454
 455 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 456 {
 457         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 458 }
 459 EXPORT_SYMBOL(ieee80211_wake_queues);
 460
 461 void ieee80211_iterate_active_interfaces(
 462         struct ieee80211_hw *hw,
 463         void (*iterator)(void *data, u8 *mac,
 464                          struct ieee80211_vif *vif),
 465         void *data)
 466 {
 467         struct ieee80211_local *local = hw_to_local(hw);
 468         struct ieee80211_sub_if_data *sdata;
 469
 470         mutex_lock(&local->iflist_mtx);
 471
 472         list_for_each_entry(sdata, &local->interfaces, list) {
 473                 switch (sdata->vif.type) {
 474                 case __NL80211_IFTYPE_AFTER_LAST:
 475                 case NL80211_IFTYPE_UNSPECIFIED:
 476                 case NL80211_IFTYPE_MONITOR:
 477                 case NL80211_IFTYPE_AP_VLAN:
 478                         continue;
 479                 case NL80211_IFTYPE_AP:
 480                 case NL80211_IFTYPE_STATION:
 481                 case NL80211_IFTYPE_ADHOC:
 482                 case NL80211_IFTYPE_WDS:
 483                 case NL80211_IFTYPE_MESH_POINT:
 484                         break;
 485                 }
 486                 if (ieee80211_sdata_running(sdata))
 487                         iterator(data, sdata->vif.addr,
 488                                  &sdata->vif);
 489         }
 490
 491         mutex_unlock(&local->iflist_mtx);
 492 }
 493 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 494
 495 void ieee80211_iterate_active_interfaces_atomic(
 496         struct ieee80211_hw *hw,
 497         void (*iterator)(void *data, u8 *mac,
 498                          struct ieee80211_vif *vif),
 499         void *data)
 500 {
 501         struct ieee80211_local *local = hw_to_local(hw);
 502         struct ieee80211_sub_if_data *sdata;
 503
 504         rcu_read_lock();
 505
 506         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 507                 switch (sdata->vif.type) {
 508                 case __NL80211_IFTYPE_AFTER_LAST:
 509                 case NL80211_IFTYPE_UNSPECIFIED:
 510                 case NL80211_IFTYPE_MONITOR:
 511                 case NL80211_IFTYPE_AP_VLAN:
 512                         continue;
 513                 case NL80211_IFTYPE_AP:
 514                 case NL80211_IFTYPE_STATION:
 515                 case NL80211_IFTYPE_ADHOC:
 516                 case NL80211_IFTYPE_WDS:
 517                 case NL80211_IFTYPE_MESH_POINT:
 518                         break;
 519                 }
 520                 if (ieee80211_sdata_running(sdata))
 521                         iterator(data, sdata->vif.addr,
 522                                  &sdata->vif);
 523         }
 524
 525         rcu_read_unlock();
 526 }
 527 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 528
 529 /*
 530  * Nothing should have been stuffed into the workqueue during
 531  * the suspend->resume cycle. If this WARN is seen then there
 532  * is a bug with either the driver suspend or something in
 533  * mac80211 stuffing into the workqueue which we haven't yet
 534  * cleared during mac80211's suspend cycle.
 535  */
 536 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 537 {
 538         if (WARN(local->suspended && !local->resuming,
 539                  "queueing ieee80211 work while going to suspend\n"))
 540                 return false;
 541
 542         return true;
 543 }
 544
 545 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 546 {
 547         struct ieee80211_local *local = hw_to_local(hw);
 548
 549         if (!ieee80211_can_queue_work(local))
 550                 return;
 551
 552         queue_work(local->workqueue, work);
 553 }
 554 EXPORT_SYMBOL(ieee80211_queue_work);
 555
 556 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 557                                   struct delayed_work *dwork,
 558                                   unsigned long delay)
 559 {
 560         struct ieee80211_local *local = hw_to_local(hw);
 561
 562         if (!ieee80211_can_queue_work(local))
 563                 return;
 564
 565         queue_delayed_work(local->workqueue, dwork, delay);
 566 }
 567 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 568
 569 void ieee802_11_parse_elems(u8 *start, size_t len,
 570                             struct ieee802_11_elems *elems)
 571 {
 572         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 573 }
 574
 575 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 576                                struct ieee802_11_elems *elems,
 577                                u64 filter, u32 crc)
 578 {
 579         size_t left = len;
 580         u8 *pos = start;
 581         bool calc_crc = filter != 0;
 582
 583         memset(elems, 0, sizeof(*elems));
 584         elems->ie_start = start;
 585         elems->total_len = len;
 586
 587         while (left >= 2) {
 588                 u8 id, elen;
 589
 590                 id = *pos++;
 591                 elen = *pos++;
 592                 left -= 2;
 593
 594                 if (elen > left)
 595                         break;
 596
 597                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 598                         crc = crc32_be(crc, pos - 2, elen + 2);
 599
 600                 switch (id) {
 601                 case WLAN_EID_SSID:
 602                         elems->ssid = pos;
 603                         elems->ssid_len = elen;
 604                         break;
 605                 case WLAN_EID_SUPP_RATES:
 606                         elems->supp_rates = pos;
 607                         elems->supp_rates_len = elen;
 608                         break;
 609                 case WLAN_EID_FH_PARAMS:
 610                         elems->fh_params = pos;
 611                         elems->fh_params_len = elen;
 612                         break;
 613                 case WLAN_EID_DS_PARAMS:
 614                         elems->ds_params = pos;
 615                         elems->ds_params_len = elen;
 616                         break;
 617                 case WLAN_EID_CF_PARAMS:
 618                         elems->cf_params = pos;
 619                         elems->cf_params_len = elen;
 620                         break;
 621                 case WLAN_EID_TIM:
 622                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 623                                 elems->tim = (void *)pos;
 624                                 elems->tim_len = elen;
 625                         }
 626                         break;
 627                 case WLAN_EID_IBSS_PARAMS:
 628                         elems->ibss_params = pos;
 629                         elems->ibss_params_len = elen;
 630                         break;
 631                 case WLAN_EID_CHALLENGE:
 632                         elems->challenge = pos;
 633                         elems->challenge_len = elen;
 634                         break;
 635                 case WLAN_EID_VENDOR_SPECIFIC:
 636                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 637                             pos[2] == 0xf2) {
 638                                 /* Microsoft OUI (00:50:F2) */
 639
 640                                 if (calc_crc)
 641                                         crc = crc32_be(crc, pos - 2, elen + 2);
 642
 643                                 if (pos[3] == 1) {
 644                                         /* OUI Type 1 - WPA IE */
 645                                         elems->wpa = pos;
 646                                         elems->wpa_len = elen;
 647                                 } else if (elen >= 5 && pos[3] == 2) {
 648                                         /* OUI Type 2 - WMM IE */
 649                                         if (pos[4] == 0) {
 650                                                 elems->wmm_info = pos;
 651                                                 elems->wmm_info_len = elen;
 652                                         } else if (pos[4] == 1) {
 653                                                 elems->wmm_param = pos;
 654                                                 elems->wmm_param_len = elen;
 655                                         }
 656                                 }
 657                         }
 658                         break;
 659                 case WLAN_EID_RSN:
 660                         elems->rsn = pos;
 661                         elems->rsn_len = elen;
 662                         break;
 663                 case WLAN_EID_ERP_INFO:
 664                         elems->erp_info = pos;
 665                         elems->erp_info_len = elen;
 666                         break;
 667                 case WLAN_EID_EXT_SUPP_RATES:
 668                         elems->ext_supp_rates = pos;
 669                         elems->ext_supp_rates_len = elen;
 670                         break;
 671                 case WLAN_EID_HT_CAPABILITY:
 672                         if (elen >= sizeof(struct ieee80211_ht_cap))
 673                                 elems->ht_cap_elem = (void *)pos;
 674                         break;
 675                 case WLAN_EID_HT_INFORMATION:
 676                         if (elen >= sizeof(struct ieee80211_ht_info))
 677                                 elems->ht_info_elem = (void *)pos;
 678                         break;
 679                 case WLAN_EID_MESH_ID:
 680                         elems->mesh_id = pos;
 681                         elems->mesh_id_len = elen;
 682                         break;
 683                 case WLAN_EID_MESH_CONFIG:
 684                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 685                                 elems->mesh_config = (void *)pos;
 686                         break;
 687                 case WLAN_EID_PEER_LINK:
 688                         elems->peer_link = pos;
 689                         elems->peer_link_len = elen;
 690                         break;
 691                 case WLAN_EID_PREQ:
 692                         elems->preq = pos;
 693                         elems->preq_len = elen;
 694                         break;
 695                 case WLAN_EID_PREP:
 696                         elems->prep = pos;
 697                         elems->prep_len = elen;
 698                         break;
 699                 case WLAN_EID_PERR:
 700                         elems->perr = pos;
 701                         elems->perr_len = elen;
 702                         break;
 703                 case WLAN_EID_RANN:
 704                         if (elen >= sizeof(struct ieee80211_rann_ie))
 705                                 elems->rann = (void *)pos;
 706                         break;
 707                 case WLAN_EID_CHANNEL_SWITCH:
 708                         elems->ch_switch_elem = pos;
 709                         elems->ch_switch_elem_len = elen;
 710                         break;
 711                 case WLAN_EID_QUIET:
 712                         if (!elems->quiet_elem) {
 713                                 elems->quiet_elem = pos;
 714                                 elems->quiet_elem_len = elen;
 715                         }
 716                         elems->num_of_quiet_elem++;
 717                         break;
 718                 case WLAN_EID_COUNTRY:
 719                         elems->country_elem = pos;
 720                         elems->country_elem_len = elen;
 721                         break;
 722                 case WLAN_EID_PWR_CONSTRAINT:
 723                         elems->pwr_constr_elem = pos;
 724                         elems->pwr_constr_elem_len = elen;
 725                         break;
 726                 case WLAN_EID_TIMEOUT_INTERVAL:
 727                         elems->timeout_int = pos;
 728                         elems->timeout_int_len = elen;
 729                         break;
 730                 default:
 731                         break;
 732                 }
 733
 734                 left -= elen;
 735                 pos += elen;
 736         }
 737
 738         return crc;
 739 }
 740
 741 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 742 {
 743         struct ieee80211_local *local = sdata->local;
 744         struct ieee80211_tx_queue_params qparam;
 745         int queue;
 746         bool use_11b;
 747         int aCWmin, aCWmax;
 748
 749         if (!local->ops->conf_tx)
 750                 return;
 751
 752         memset(&qparam, 0, sizeof(qparam));
 753
 754         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 755                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 756
 757         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 758                 /* Set defaults according to 802.11-2007 Table 7-37 */
 759                 aCWmax = 1023;
 760                 if (use_11b)
 761                         aCWmin = 31;
 762                 else
 763                         aCWmin = 15;
 764
 765                 switch (queue) {
 766                 case 3: /* AC_BK */
 767                         qparam.cw_max = aCWmax;
 768                         qparam.cw_min = aCWmin;
 769                         qparam.txop = 0;
 770                         qparam.aifs = 7;
 771                         break;
 772                 default: /* never happens but let's not leave undefined */
 773                 case 2: /* AC_BE */
 774                         qparam.cw_max = aCWmax;
 775                         qparam.cw_min = aCWmin;
 776                         qparam.txop = 0;
 777                         qparam.aifs = 3;
 778                         break;
 779                 case 1: /* AC_VI */
 780                         qparam.cw_max = aCWmin;
 781                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 782                         if (use_11b)
 783                                 qparam.txop = 6016/32;
 784                         else
 785                                 qparam.txop = 3008/32;
 786                         qparam.aifs = 2;
 787                         break;
 788                 case 0: /* AC_VO */
 789                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 790                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 791                         if (use_11b)
 792                                 qparam.txop = 3264/32;
 793                         else
 794                                 qparam.txop = 1504/32;
 795                         qparam.aifs = 2;
 796                         break;
 797                 }
 798
 799                 qparam.uapsd = false;
 800
 801                 drv_conf_tx(local, queue, &qparam);
 802         }
 803
 804         /* after reinitialize QoS TX queues setting to default,
 805          * disable QoS at all */
 806         local->hw.conf.flags &= ~IEEE80211_CONF_QOS;
 807         drv_config(local, IEEE80211_CONF_CHANGE_QOS);
 808 }
 809
 810 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 811                                   const size_t supp_rates_len,
 812                                   const u8 *supp_rates)
 813 {
 814         struct ieee80211_local *local = sdata->local;
 815         int i, have_higher_than_11mbit = 0;
 816
 817         /* cf. IEEE 802.11 9.2.12 */
 818         for (i = 0; i < supp_rates_len; i++)
 819                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 820                         have_higher_than_11mbit = 1;
 821
 822         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 823             have_higher_than_11mbit)
 824                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 825         else
 826                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 827
 828         ieee80211_set_wmm_default(sdata);
 829 }
 830
 831 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 832                               enum ieee80211_band band)
 833 {
 834         struct ieee80211_supported_band *sband;
 835         struct ieee80211_rate *bitrates;
 836         u32 mandatory_rates;
 837         enum ieee80211_rate_flags mandatory_flag;
 838         int i;
 839
 840         sband = local->hw.wiphy->bands[band];
 841         if (!sband) {
 842                 WARN_ON(1);
 843                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 844         }
 845
 846         if (band == IEEE80211_BAND_2GHZ)
 847                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 848         else
 849                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 850
 851         bitrates = sband->bitrates;
 852         mandatory_rates = 0;
 853         for (i = 0; i < sband->n_bitrates; i++)
 854                 if (bitrates[i].flags & mandatory_flag)
 855                         mandatory_rates |= BIT(i);
 856         return mandatory_rates;
 857 }
 858
 859 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 860                          u16 transaction, u16 auth_alg,
 861                          u8 *extra, size_t extra_len, const u8 *bssid,
 862                          const u8 *key, u8 key_len, u8 key_idx)
 863 {
 864         struct ieee80211_local *local = sdata->local;
 865         struct sk_buff *skb;
 866         struct ieee80211_mgmt *mgmt;
 867         int err;
 868
 869         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 870                             sizeof(*mgmt) + 6 + extra_len);
 871         if (!skb) {
 872                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 873                        "frame\n", sdata->name);
 874                 return;
 875         }
 876         skb_reserve(skb, local->hw.extra_tx_headroom);
 877
 878         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 879         memset(mgmt, 0, 24 + 6);
 880         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 881                                           IEEE80211_STYPE_AUTH);
 882         memcpy(mgmt->da, bssid, ETH_ALEN);
 883         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 884         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 885         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 886         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 887         mgmt->u.auth.status_code = cpu_to_le16(0);
 888         if (extra)
 889                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 890
 891         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 892                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 893                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 894                 WARN_ON(err);
 895         }
 896
 897         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 898         ieee80211_tx_skb(sdata, skb);
 899 }
 900
 901 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 902                              const u8 *ie, size_t ie_len,
 903                              enum ieee80211_band band)
 904 {
 905         struct ieee80211_supported_band *sband;
 906         u8 *pos;
 907         size_t offset = 0, noffset;
 908         int supp_rates_len, i;
 909
 910         sband = local->hw.wiphy->bands[band];
 911
 912         pos = buffer;
 913
 914         supp_rates_len = min_t(int, sband->n_bitrates, 8);
 915
 916         *pos++ = WLAN_EID_SUPP_RATES;
 917         *pos++ = supp_rates_len;
 918
 919         for (i = 0; i < supp_rates_len; i++) {
 920                 int rate = sband->bitrates[i].bitrate;
 921                 *pos++ = (u8) (rate / 5);
 922         }
 923
 924         /* insert "request information" if in custom IEs */
 925         if (ie && ie_len) {
 926                 static const u8 before_extrates[] = {
 927                         WLAN_EID_SSID,
 928                         WLAN_EID_SUPP_RATES,
 929                         WLAN_EID_REQUEST,
 930                 };
 931                 noffset = ieee80211_ie_split(ie, ie_len,
 932                                              before_extrates,
 933                                              ARRAY_SIZE(before_extrates),
 934                                              offset);
 935                 memcpy(pos, ie + offset, noffset - offset);
 936                 pos += noffset - offset;
 937                 offset = noffset;
 938         }
 939
 940         if (sband->n_bitrates > i) {
 941                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 942                 *pos++ = sband->n_bitrates - i;
 943
 944                 for (; i < sband->n_bitrates; i++) {
 945                         int rate = sband->bitrates[i].bitrate;
 946                         *pos++ = (u8) (rate / 5);
 947                 }
 948         }
 949
 950         /* insert custom IEs that go before HT */
 951         if (ie && ie_len) {
 952                 static const u8 before_ht[] = {
 953                         WLAN_EID_SSID,
 954                         WLAN_EID_SUPP_RATES,
 955                         WLAN_EID_REQUEST,
 956                         WLAN_EID_EXT_SUPP_RATES,
 957                         WLAN_EID_DS_PARAMS,
 958                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 959                 };
 960                 noffset = ieee80211_ie_split(ie, ie_len,
 961                                              before_ht, ARRAY_SIZE(before_ht),
 962                                              offset);
 963                 memcpy(pos, ie + offset, noffset - offset);
 964                 pos += noffset - offset;
 965                 offset = noffset;
 966         }
 967
 968         if (sband->ht_cap.ht_supported) {
 969                 u16 cap = sband->ht_cap.cap;
 970                 __le16 tmp;
 971
 972                 if (ieee80211_disable_40mhz_24ghz &&
 973                     sband->band == IEEE80211_BAND_2GHZ) {
 974                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 975                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 976                 }
 977
 978                 *pos++ = WLAN_EID_HT_CAPABILITY;
 979                 *pos++ = sizeof(struct ieee80211_ht_cap);
 980                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 981                 tmp = cpu_to_le16(cap);
 982                 memcpy(pos, &tmp, sizeof(u16));
 983                 pos += sizeof(u16);
 984                 *pos++ = sband->ht_cap.ampdu_factor |
 985                          (sband->ht_cap.ampdu_density <<
 986                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
 987                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 988                 pos += sizeof(sband->ht_cap.mcs);
 989                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 990         }
 991
 992         /*
 993          * If adding more here, adjust code in main.c
 994          * that calculates local->scan_ies_len.
 995          */
 996
 997         /* add any remaining custom IEs */
 998         if (ie && ie_len) {
 999                 noffset = ie_len;
1000                 memcpy(pos, ie + offset, noffset - offset);
1001                 pos += noffset - offset;
1002         }
1003
1004         return pos - buffer;
1005 }
1006
1007 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1008                               const u8 *ssid, size_t ssid_len,
1009                               const u8 *ie, size_t ie_len)
1010 {
1011         struct ieee80211_local *local = sdata->local;
1012         struct sk_buff *skb;
1013         struct ieee80211_mgmt *mgmt;
1014         size_t buf_len;
1015         u8 *buf;
1016
1017         /* FIXME: come up with a proper value */
1018         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1019         if (!buf) {
1020                 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1021                        "buffer\n", sdata->name);
1022                 return;
1023         }
1024
1025         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1026                                            local->hw.conf.channel->band);
1027
1028         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1029                                      ssid, ssid_len,
1030                                      buf, buf_len);
1031
1032         if (dst) {
1033                 mgmt = (struct ieee80211_mgmt *) skb->data;
1034                 memcpy(mgmt->da, dst, ETH_ALEN);
1035                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1036         }
1037
1038         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1039         ieee80211_tx_skb(sdata, skb);
1040         kfree(buf);
1041 }
1042
1043 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1044                             struct ieee802_11_elems *elems,
1045                             enum ieee80211_band band)
1046 {
1047         struct ieee80211_supported_band *sband;
1048         struct ieee80211_rate *bitrates;
1049         size_t num_rates;
1050         u32 supp_rates;
1051         int i, j;
1052         sband = local->hw.wiphy->bands[band];
1053
1054         if (!sband) {
1055                 WARN_ON(1);
1056                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1057         }
1058
1059         bitrates = sband->bitrates;
1060         num_rates = sband->n_bitrates;
1061         supp_rates = 0;
1062         for (i = 0; i < elems->supp_rates_len +
1063                      elems->ext_supp_rates_len; i++) {
1064                 u8 rate = 0;
1065                 int own_rate;
1066                 if (i < elems->supp_rates_len)
1067                         rate = elems->supp_rates[i];
1068                 else if (elems->ext_supp_rates)
1069                         rate = elems->ext_supp_rates
1070                                 [i - elems->supp_rates_len];
1071                 own_rate = 5 * (rate & 0x7f);
1072                 for (j = 0; j < num_rates; j++)
1073                         if (bitrates[j].bitrate == own_rate)
1074                                 supp_rates |= BIT(j);
1075         }
1076         return supp_rates;
1077 }
1078
1079 void ieee80211_stop_device(struct ieee80211_local *local)
1080 {
1081         ieee80211_led_radio(local, false);
1082
1083         cancel_work_sync(&local->reconfig_filter);
1084
1085         flush_workqueue(local->workqueue);
1086         drv_stop(local);
1087 }
1088
1089 int ieee80211_reconfig(struct ieee80211_local *local)
1090 {
1091         struct ieee80211_hw *hw = &local->hw;
1092         struct ieee80211_sub_if_data *sdata;
1093         struct sta_info *sta;
1094         int res;
1095
1096         if (local->suspended)
1097                 local->resuming = true;
1098
1099         /* restart hardware */
1100         if (local->open_count) {
1101                 /*
1102                  * Upon resume hardware can sometimes be goofy due to
1103                  * various platform / driver / bus issues, so restarting
1104                  * the device may at times not work immediately. Propagate
1105                  * the error.
1106                  */
1107                 res = drv_start(local);
1108                 if (res) {
1109                         WARN(local->suspended, "Hardware became unavailable "
1110                              "upon resume. This could be a software issue "
1111                              "prior to suspend or a hardware issue.\n");
1112                         return res;
1113                 }
1114
1115                 ieee80211_led_radio(local, true);
1116         }
1117
1118         /* add interfaces */
1119         list_for_each_entry(sdata, &local->interfaces, list) {
1120                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1121                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1122                     ieee80211_sdata_running(sdata))
1123                         res = drv_add_interface(local, &sdata->vif);
1124         }
1125
1126         /* add STAs back */
1127         mutex_lock(&local->sta_mtx);
1128         list_for_each_entry(sta, &local->sta_list, list) {
1129                 if (sta->uploaded) {
1130                         sdata = sta->sdata;
1131                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1132                                 sdata = container_of(sdata->bss,
1133                                              struct ieee80211_sub_if_data,
1134                                              u.ap);
1135
1136                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1137                 }
1138         }
1139         mutex_unlock(&local->sta_mtx);
1140
1141         /* Clear Suspend state so that ADDBA requests can be processed */
1142
1143         rcu_read_lock();
1144
1145         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1146                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1147                         clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1148                 }
1149         }
1150
1151         rcu_read_unlock();
1152
1153         /* setup RTS threshold */
1154         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1155
1156         /* reconfigure hardware */
1157         ieee80211_hw_config(local, ~0);
1158
1159         ieee80211_configure_filter(local);
1160
1161         /* Finally also reconfigure all the BSS information */
1162         list_for_each_entry(sdata, &local->interfaces, list) {
1163                 u32 changed;
1164
1165                 if (!ieee80211_sdata_running(sdata))
1166                         continue;
1167
1168                 /* common change flags for all interface types */
1169                 changed = BSS_CHANGED_ERP_CTS_PROT |
1170                           BSS_CHANGED_ERP_PREAMBLE |
1171                           BSS_CHANGED_ERP_SLOT |
1172                           BSS_CHANGED_HT |
1173                           BSS_CHANGED_BASIC_RATES |
1174                           BSS_CHANGED_BEACON_INT |
1175                           BSS_CHANGED_BSSID |
1176                           BSS_CHANGED_CQM;
1177
1178                 switch (sdata->vif.type) {
1179                 case NL80211_IFTYPE_STATION:
1180                         changed |= BSS_CHANGED_ASSOC;
1181                         ieee80211_bss_info_change_notify(sdata, changed);
1182                         break;
1183                 case NL80211_IFTYPE_ADHOC:
1184                         changed |= BSS_CHANGED_IBSS;
1185                         /* fall through */
1186                 case NL80211_IFTYPE_AP:
1187                 case NL80211_IFTYPE_MESH_POINT:
1188                         changed |= BSS_CHANGED_BEACON |
1189                                    BSS_CHANGED_BEACON_ENABLED;
1190                         ieee80211_bss_info_change_notify(sdata, changed);
1191                         break;
1192                 case NL80211_IFTYPE_WDS:
1193                         break;
1194                 case NL80211_IFTYPE_AP_VLAN:
1195                 case NL80211_IFTYPE_MONITOR:
1196                         /* ignore virtual */
1197                         break;
1198                 case NL80211_IFTYPE_UNSPECIFIED:
1199                 case __NL80211_IFTYPE_AFTER_LAST:
1200                         WARN_ON(1);
1201                         break;
1202                 }
1203         }
1204
1205         rcu_read_lock();
1206         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1207                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1208                         ieee80211_sta_tear_down_BA_sessions(sta);
1209                 }
1210         }
1211         rcu_read_unlock();
1212
1213         /* add back keys */
1214         list_for_each_entry(sdata, &local->interfaces, list)
1215                 if (ieee80211_sdata_running(sdata))
1216                         ieee80211_enable_keys(sdata);
1217
1218         ieee80211_wake_queues_by_reason(hw,
1219                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1220
1221         /*
1222          * If this is for hw restart things are still running.
1223          * We may want to change that later, however.
1224          */
1225         if (!local->suspended)
1226                 return 0;
1227
1228 #ifdef CONFIG_PM
1229         /* first set suspended false, then resuming */
1230         local->suspended = false;
1231         mb();
1232         local->resuming = false;
1233
1234         list_for_each_entry(sdata, &local->interfaces, list) {
1235                 switch(sdata->vif.type) {
1236                 case NL80211_IFTYPE_STATION:
1237                         ieee80211_sta_restart(sdata);
1238                         break;
1239                 case NL80211_IFTYPE_ADHOC:
1240                         ieee80211_ibss_restart(sdata);
1241                         break;
1242                 case NL80211_IFTYPE_MESH_POINT:
1243                         ieee80211_mesh_restart(sdata);
1244                         break;
1245                 default:
1246                         break;
1247                 }
1248         }
1249
1250         add_timer(&local->sta_cleanup);
1251
1252         mutex_lock(&local->sta_mtx);
1253         list_for_each_entry(sta, &local->sta_list, list)
1254                 mesh_plink_restart(sta);
1255         mutex_unlock(&local->sta_mtx);
1256 #else
1257         WARN_ON(1);
1258 #endif
1259         return 0;
1260 }
1261
1262 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1263                           enum ieee80211_smps_mode *smps_mode)
1264 {
1265         if (ifmgd->associated) {
1266                 *smps_mode = ifmgd->ap_smps;
1267
1268                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1269                         if (ifmgd->powersave)
1270                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1271                         else
1272                                 *smps_mode = IEEE80211_SMPS_OFF;
1273                 }
1274
1275                 return 1;
1276         }
1277
1278         return 0;
1279 }
1280
1281 /* must hold iflist_mtx */
1282 void ieee80211_recalc_smps(struct ieee80211_local *local,
1283                            struct ieee80211_sub_if_data *forsdata)
1284 {
1285         struct ieee80211_sub_if_data *sdata;
1286         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1287         int count = 0;
1288
1289         if (forsdata)
1290                 WARN_ON(!mutex_is_locked(&forsdata->u.mgd.mtx));
1291
1292         WARN_ON(!mutex_is_locked(&local->iflist_mtx));
1293
1294         /*
1295          * This function could be improved to handle multiple
1296          * interfaces better, but right now it makes any
1297          * non-station interfaces force SM PS to be turned
1298          * off. If there are multiple station interfaces it
1299          * could also use the best possible mode, e.g. if
1300          * one is in static and the other in dynamic then
1301          * dynamic is ok.
1302          */
1303
1304         list_for_each_entry(sdata, &local->interfaces, list) {
1305                 if (!netif_running(sdata->dev))
1306                         continue;
1307                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1308                         goto set;
1309                 if (sdata != forsdata) {
1310                         /*
1311                          * This nested is ok -- we are holding the iflist_mtx
1312                          * so can't get here twice or so. But it's required
1313                          * since normally we acquire it first and then the
1314                          * iflist_mtx.
1315                          */
1316                         mutex_lock_nested(&sdata->u.mgd.mtx, SINGLE_DEPTH_NESTING);
1317                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1318                         mutex_unlock(&sdata->u.mgd.mtx);
1319                 } else
1320                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1321
1322                 if (count > 1) {
1323                         smps_mode = IEEE80211_SMPS_OFF;
1324                         break;
1325                 }
1326         }
1327
1328         if (smps_mode == local->smps_mode)
1329                 return;
1330
1331  set:
1332         local->smps_mode = smps_mode;
1333         /* changed flag is auto-detected for this */
1334         ieee80211_hw_config(local, 0);
1335 }
1336
1337 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1338 {
1339         int i;
1340
1341         for (i = 0; i < n_ids; i++)
1342                 if (ids[i] == id)
1343                         return true;
1344         return false;
1345 }
1346
1347 /**
1348  * ieee80211_ie_split - split an IE buffer according to ordering
1349  *
1350  * @ies: the IE buffer
1351  * @ielen: the length of the IE buffer
1352  * @ids: an array with element IDs that are allowed before
1353  *      the split
1354  * @n_ids: the size of the element ID array
1355  * @offset: offset where to start splitting in the buffer
1356  *
1357  * This function splits an IE buffer by updating the @offset
1358  * variable to point to the location where the buffer should be
1359  * split.
1360  *
1361  * It assumes that the given IE buffer is well-formed, this
1362  * has to be guaranteed by the caller!
1363  *
1364  * It also assumes that the IEs in the buffer are ordered
1365  * correctly, if not the result of using this function will not
1366  * be ordered correctly either, i.e. it does no reordering.
1367  *
1368  * The function returns the offset where the next part of the
1369  * buffer starts, which may be @ielen if the entire (remainder)
1370  * of the buffer should be used.
1371  */
1372 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1373                           const u8 *ids, int n_ids, size_t offset)
1374 {
1375         size_t pos = offset;
1376
1377         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1378                 pos += 2 + ies[pos + 1];
1379
1380         return pos;
1381 }
1382
1383 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1384 {
1385         size_t pos = offset;
1386
1387         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1388                 pos += 2 + ies[pos + 1];
1389
1390         return pos;
1391 }