SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         if (WARN_ON(queue >= hw->queues))
 274                 return;
 275
 276         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 277
 278         if (local->queue_stop_reasons[queue] != 0)
 279                 /* someone still has this queue stopped */
 280                 return;
 281
 282         if (!skb_queue_empty(&local->pending[queue]))
 283                 tasklet_schedule(&local->tx_pending_tasklet);
 284
 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 }
 290
 291 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 292                                     enum queue_stop_reason reason)
 293 {
 294         struct ieee80211_local *local = hw_to_local(hw);
 295         unsigned long flags;
 296
 297         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 298         __ieee80211_wake_queue(hw, queue, reason);
 299         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 300 }
 301
 302 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 303 {
 304         ieee80211_wake_queue_by_reason(hw, queue,
 305                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 306 }
 307 EXPORT_SYMBOL(ieee80211_wake_queue);
 308
 309 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 310                                    enum queue_stop_reason reason)
 311 {
 312         struct ieee80211_local *local = hw_to_local(hw);
 313         struct ieee80211_sub_if_data *sdata;
 314
 315         if (WARN_ON(queue >= hw->queues))
 316                 return;
 317
 318         __set_bit(reason, &local->queue_stop_reasons[queue]);
 319
 320         rcu_read_lock();
 321         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 322                 netif_tx_stop_queue(netdev_get_tx_queue(sdata->dev, queue));
 323         rcu_read_unlock();
 324 }
 325
 326 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 327                                     enum queue_stop_reason reason)
 328 {
 329         struct ieee80211_local *local = hw_to_local(hw);
 330         unsigned long flags;
 331
 332         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 333         __ieee80211_stop_queue(hw, queue, reason);
 334         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 335 }
 336
 337 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 338 {
 339         ieee80211_stop_queue_by_reason(hw, queue,
 340                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 341 }
 342 EXPORT_SYMBOL(ieee80211_stop_queue);
 343
 344 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 345                                struct sk_buff *skb)
 346 {
 347         struct ieee80211_hw *hw = &local->hw;
 348         unsigned long flags;
 349         int queue = skb_get_queue_mapping(skb);
 350         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 351
 352         if (WARN_ON(!info->control.vif)) {
 353                 kfree_skb(skb);
 354                 return;
 355         }
 356
 357         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 358         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 359         __skb_queue_tail(&local->pending[queue], skb);
 360         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 361         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 362 }
 363
 364 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 365                                struct sk_buff_head *skbs)
 366 {
 367         struct ieee80211_hw *hw = &local->hw;
 368         struct sk_buff *skb;
 369         unsigned long flags;
 370         int queue, ret = 0, i;
 371
 372         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 373         for (i = 0; i < hw->queues; i++)
 374                 __ieee80211_stop_queue(hw, i,
 375                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 376
 377         while ((skb = skb_dequeue(skbs))) {
 378                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 379
 380                 if (WARN_ON(!info->control.vif)) {
 381                         kfree_skb(skb);
 382                         continue;
 383                 }
 384
 385                 ret++;
 386                 queue = skb_get_queue_mapping(skb);
 387                 __skb_queue_tail(&local->pending[queue], skb);
 388         }
 389
 390         for (i = 0; i < hw->queues; i++)
 391                 __ieee80211_wake_queue(hw, i,
 392                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 393         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 394
 395         return ret;
 396 }
 397
 398 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 399                                     enum queue_stop_reason reason)
 400 {
 401         struct ieee80211_local *local = hw_to_local(hw);
 402         unsigned long flags;
 403         int i;
 404
 405         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 406
 407         for (i = 0; i < hw->queues; i++)
 408                 __ieee80211_stop_queue(hw, i, reason);
 409
 410         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 411 }
 412
 413 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 414 {
 415         ieee80211_stop_queues_by_reason(hw,
 416                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 417 }
 418 EXPORT_SYMBOL(ieee80211_stop_queues);
 419
 420 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 421 {
 422         struct ieee80211_local *local = hw_to_local(hw);
 423         unsigned long flags;
 424         int ret;
 425
 426         if (WARN_ON(queue >= hw->queues))
 427                 return true;
 428
 429         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 430         ret = !!local->queue_stop_reasons[queue];
 431         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 432         return ret;
 433 }
 434 EXPORT_SYMBOL(ieee80211_queue_stopped);
 435
 436 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 437                                      enum queue_stop_reason reason)
 438 {
 439         struct ieee80211_local *local = hw_to_local(hw);
 440         unsigned long flags;
 441         int i;
 442
 443         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 444
 445         for (i = 0; i < hw->queues; i++)
 446                 __ieee80211_wake_queue(hw, i, reason);
 447
 448         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 449 }
 450
 451 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 452 {
 453         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 454 }
 455 EXPORT_SYMBOL(ieee80211_wake_queues);
 456
 457 void ieee80211_iterate_active_interfaces(
 458         struct ieee80211_hw *hw,
 459         void (*iterator)(void *data, u8 *mac,
 460                          struct ieee80211_vif *vif),
 461         void *data)
 462 {
 463         struct ieee80211_local *local = hw_to_local(hw);
 464         struct ieee80211_sub_if_data *sdata;
 465
 466         mutex_lock(&local->iflist_mtx);
 467
 468         list_for_each_entry(sdata, &local->interfaces, list) {
 469                 switch (sdata->vif.type) {
 470                 case __NL80211_IFTYPE_AFTER_LAST:
 471                 case NL80211_IFTYPE_UNSPECIFIED:
 472                 case NL80211_IFTYPE_MONITOR:
 473                 case NL80211_IFTYPE_AP_VLAN:
 474                         continue;
 475                 case NL80211_IFTYPE_AP:
 476                 case NL80211_IFTYPE_STATION:
 477                 case NL80211_IFTYPE_ADHOC:
 478                 case NL80211_IFTYPE_WDS:
 479                 case NL80211_IFTYPE_MESH_POINT:
 480                         break;
 481                 }
 482                 if (ieee80211_sdata_running(sdata))
 483                         iterator(data, sdata->vif.addr,
 484                                  &sdata->vif);
 485         }
 486
 487         mutex_unlock(&local->iflist_mtx);
 488 }
 489 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 490
 491 void ieee80211_iterate_active_interfaces_atomic(
 492         struct ieee80211_hw *hw,
 493         void (*iterator)(void *data, u8 *mac,
 494                          struct ieee80211_vif *vif),
 495         void *data)
 496 {
 497         struct ieee80211_local *local = hw_to_local(hw);
 498         struct ieee80211_sub_if_data *sdata;
 499
 500         rcu_read_lock();
 501
 502         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 503                 switch (sdata->vif.type) {
 504                 case __NL80211_IFTYPE_AFTER_LAST:
 505                 case NL80211_IFTYPE_UNSPECIFIED:
 506                 case NL80211_IFTYPE_MONITOR:
 507                 case NL80211_IFTYPE_AP_VLAN:
 508                         continue;
 509                 case NL80211_IFTYPE_AP:
 510                 case NL80211_IFTYPE_STATION:
 511                 case NL80211_IFTYPE_ADHOC:
 512                 case NL80211_IFTYPE_WDS:
 513                 case NL80211_IFTYPE_MESH_POINT:
 514                         break;
 515                 }
 516                 if (ieee80211_sdata_running(sdata))
 517                         iterator(data, sdata->vif.addr,
 518                                  &sdata->vif);
 519         }
 520
 521         rcu_read_unlock();
 522 }
 523 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 524
 525 /*
 526  * Nothing should have been stuffed into the workqueue during
 527  * the suspend->resume cycle. If this WARN is seen then there
 528  * is a bug with either the driver suspend or something in
 529  * mac80211 stuffing into the workqueue which we haven't yet
 530  * cleared during mac80211's suspend cycle.
 531  */
 532 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 533 {
 534         if (WARN(local->suspended && !local->resuming,
 535                  "queueing ieee80211 work while going to suspend\n"))
 536                 return false;
 537
 538         return true;
 539 }
 540
 541 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 542 {
 543         struct ieee80211_local *local = hw_to_local(hw);
 544
 545         if (!ieee80211_can_queue_work(local))
 546                 return;
 547
 548         queue_work(local->workqueue, work);
 549 }
 550 EXPORT_SYMBOL(ieee80211_queue_work);
 551
 552 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 553                                   struct delayed_work *dwork,
 554                                   unsigned long delay)
 555 {
 556         struct ieee80211_local *local = hw_to_local(hw);
 557
 558         if (!ieee80211_can_queue_work(local))
 559                 return;
 560
 561         queue_delayed_work(local->workqueue, dwork, delay);
 562 }
 563 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 564
 565 void ieee802_11_parse_elems(u8 *start, size_t len,
 566                             struct ieee802_11_elems *elems)
 567 {
 568         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 569 }
 570
 571 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 572                                struct ieee802_11_elems *elems,
 573                                u64 filter, u32 crc)
 574 {
 575         size_t left = len;
 576         u8 *pos = start;
 577         bool calc_crc = filter != 0;
 578
 579         memset(elems, 0, sizeof(*elems));
 580         elems->ie_start = start;
 581         elems->total_len = len;
 582
 583         while (left >= 2) {
 584                 u8 id, elen;
 585
 586                 id = *pos++;
 587                 elen = *pos++;
 588                 left -= 2;
 589
 590                 if (elen > left)
 591                         break;
 592
 593                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 594                         crc = crc32_be(crc, pos - 2, elen + 2);
 595
 596                 switch (id) {
 597                 case WLAN_EID_SSID:
 598                         elems->ssid = pos;
 599                         elems->ssid_len = elen;
 600                         break;
 601                 case WLAN_EID_SUPP_RATES:
 602                         elems->supp_rates = pos;
 603                         elems->supp_rates_len = elen;
 604                         break;
 605                 case WLAN_EID_FH_PARAMS:
 606                         elems->fh_params = pos;
 607                         elems->fh_params_len = elen;
 608                         break;
 609                 case WLAN_EID_DS_PARAMS:
 610                         elems->ds_params = pos;
 611                         elems->ds_params_len = elen;
 612                         break;
 613                 case WLAN_EID_CF_PARAMS:
 614                         elems->cf_params = pos;
 615                         elems->cf_params_len = elen;
 616                         break;
 617                 case WLAN_EID_TIM:
 618                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 619                                 elems->tim = (void *)pos;
 620                                 elems->tim_len = elen;
 621                         }
 622                         break;
 623                 case WLAN_EID_IBSS_PARAMS:
 624                         elems->ibss_params = pos;
 625                         elems->ibss_params_len = elen;
 626                         break;
 627                 case WLAN_EID_CHALLENGE:
 628                         elems->challenge = pos;
 629                         elems->challenge_len = elen;
 630                         break;
 631                 case WLAN_EID_VENDOR_SPECIFIC:
 632                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 633                             pos[2] == 0xf2) {
 634                                 /* Microsoft OUI (00:50:F2) */
 635
 636                                 if (calc_crc)
 637                                         crc = crc32_be(crc, pos - 2, elen + 2);
 638
 639                                 if (pos[3] == 1) {
 640                                         /* OUI Type 1 - WPA IE */
 641                                         elems->wpa = pos;
 642                                         elems->wpa_len = elen;
 643                                 } else if (elen >= 5 && pos[3] == 2) {
 644                                         /* OUI Type 2 - WMM IE */
 645                                         if (pos[4] == 0) {
 646                                                 elems->wmm_info = pos;
 647                                                 elems->wmm_info_len = elen;
 648                                         } else if (pos[4] == 1) {
 649                                                 elems->wmm_param = pos;
 650                                                 elems->wmm_param_len = elen;
 651                                         }
 652                                 }
 653                         }
 654                         break;
 655                 case WLAN_EID_RSN:
 656                         elems->rsn = pos;
 657                         elems->rsn_len = elen;
 658                         break;
 659                 case WLAN_EID_ERP_INFO:
 660                         elems->erp_info = pos;
 661                         elems->erp_info_len = elen;
 662                         break;
 663                 case WLAN_EID_EXT_SUPP_RATES:
 664                         elems->ext_supp_rates = pos;
 665                         elems->ext_supp_rates_len = elen;
 666                         break;
 667                 case WLAN_EID_HT_CAPABILITY:
 668                         if (elen >= sizeof(struct ieee80211_ht_cap))
 669                                 elems->ht_cap_elem = (void *)pos;
 670                         break;
 671                 case WLAN_EID_HT_INFORMATION:
 672                         if (elen >= sizeof(struct ieee80211_ht_info))
 673                                 elems->ht_info_elem = (void *)pos;
 674                         break;
 675                 case WLAN_EID_MESH_ID:
 676                         elems->mesh_id = pos;
 677                         elems->mesh_id_len = elen;
 678                         break;
 679                 case WLAN_EID_MESH_CONFIG:
 680                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 681                                 elems->mesh_config = (void *)pos;
 682                         break;
 683                 case WLAN_EID_PEER_LINK:
 684                         elems->peer_link = pos;
 685                         elems->peer_link_len = elen;
 686                         break;
 687                 case WLAN_EID_PREQ:
 688                         elems->preq = pos;
 689                         elems->preq_len = elen;
 690                         break;
 691                 case WLAN_EID_PREP:
 692                         elems->prep = pos;
 693                         elems->prep_len = elen;
 694                         break;
 695                 case WLAN_EID_PERR:
 696                         elems->perr = pos;
 697                         elems->perr_len = elen;
 698                         break;
 699                 case WLAN_EID_RANN:
 700                         if (elen >= sizeof(struct ieee80211_rann_ie))
 701                                 elems->rann = (void *)pos;
 702                         break;
 703                 case WLAN_EID_CHANNEL_SWITCH:
 704                         elems->ch_switch_elem = pos;
 705                         elems->ch_switch_elem_len = elen;
 706                         break;
 707                 case WLAN_EID_QUIET:
 708                         if (!elems->quiet_elem) {
 709                                 elems->quiet_elem = pos;
 710                                 elems->quiet_elem_len = elen;
 711                         }
 712                         elems->num_of_quiet_elem++;
 713                         break;
 714                 case WLAN_EID_COUNTRY:
 715                         elems->country_elem = pos;
 716                         elems->country_elem_len = elen;
 717                         break;
 718                 case WLAN_EID_PWR_CONSTRAINT:
 719                         elems->pwr_constr_elem = pos;
 720                         elems->pwr_constr_elem_len = elen;
 721                         break;
 722                 case WLAN_EID_TIMEOUT_INTERVAL:
 723                         elems->timeout_int = pos;
 724                         elems->timeout_int_len = elen;
 725                         break;
 726                 default:
 727                         break;
 728                 }
 729
 730                 left -= elen;
 731                 pos += elen;
 732         }
 733
 734         return crc;
 735 }
 736
 737 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 738 {
 739         struct ieee80211_local *local = sdata->local;
 740         struct ieee80211_tx_queue_params qparam;
 741         int queue;
 742         bool use_11b;
 743         int aCWmin, aCWmax;
 744
 745         if (!local->ops->conf_tx)
 746                 return;
 747
 748         memset(&qparam, 0, sizeof(qparam));
 749
 750         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 751                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 752
 753         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 754                 /* Set defaults according to 802.11-2007 Table 7-37 */
 755                 aCWmax = 1023;
 756                 if (use_11b)
 757                         aCWmin = 31;
 758                 else
 759                         aCWmin = 15;
 760
 761                 switch (queue) {
 762                 case 3: /* AC_BK */
 763                         qparam.cw_max = aCWmax;
 764                         qparam.cw_min = aCWmin;
 765                         qparam.txop = 0;
 766                         qparam.aifs = 7;
 767                         break;
 768                 default: /* never happens but let's not leave undefined */
 769                 case 2: /* AC_BE */
 770                         qparam.cw_max = aCWmax;
 771                         qparam.cw_min = aCWmin;
 772                         qparam.txop = 0;
 773                         qparam.aifs = 3;
 774                         break;
 775                 case 1: /* AC_VI */
 776                         qparam.cw_max = aCWmin;
 777                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 778                         if (use_11b)
 779                                 qparam.txop = 6016/32;
 780                         else
 781                                 qparam.txop = 3008/32;
 782                         qparam.aifs = 2;
 783                         break;
 784                 case 0: /* AC_VO */
 785                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 786                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 787                         if (use_11b)
 788                                 qparam.txop = 3264/32;
 789                         else
 790                                 qparam.txop = 1504/32;
 791                         qparam.aifs = 2;
 792                         break;
 793                 }
 794
 795                 qparam.uapsd = false;
 796
 797                 drv_conf_tx(local, queue, &qparam);
 798         }
 799 }
 800
 801 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 802                                   const size_t supp_rates_len,
 803                                   const u8 *supp_rates)
 804 {
 805         struct ieee80211_local *local = sdata->local;
 806         int i, have_higher_than_11mbit = 0;
 807
 808         /* cf. IEEE 802.11 9.2.12 */
 809         for (i = 0; i < supp_rates_len; i++)
 810                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 811                         have_higher_than_11mbit = 1;
 812
 813         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 814             have_higher_than_11mbit)
 815                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 816         else
 817                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 818
 819         ieee80211_set_wmm_default(sdata);
 820 }
 821
 822 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 823                               enum ieee80211_band band)
 824 {
 825         struct ieee80211_supported_band *sband;
 826         struct ieee80211_rate *bitrates;
 827         u32 mandatory_rates;
 828         enum ieee80211_rate_flags mandatory_flag;
 829         int i;
 830
 831         sband = local->hw.wiphy->bands[band];
 832         if (!sband) {
 833                 WARN_ON(1);
 834                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 835         }
 836
 837         if (band == IEEE80211_BAND_2GHZ)
 838                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 839         else
 840                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 841
 842         bitrates = sband->bitrates;
 843         mandatory_rates = 0;
 844         for (i = 0; i < sband->n_bitrates; i++)
 845                 if (bitrates[i].flags & mandatory_flag)
 846                         mandatory_rates |= BIT(i);
 847         return mandatory_rates;
 848 }
 849
 850 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 851                          u16 transaction, u16 auth_alg,
 852                          u8 *extra, size_t extra_len, const u8 *bssid,
 853                          const u8 *key, u8 key_len, u8 key_idx)
 854 {
 855         struct ieee80211_local *local = sdata->local;
 856         struct sk_buff *skb;
 857         struct ieee80211_mgmt *mgmt;
 858         int err;
 859
 860         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 861                             sizeof(*mgmt) + 6 + extra_len);
 862         if (!skb) {
 863                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 864                        "frame\n", sdata->name);
 865                 return;
 866         }
 867         skb_reserve(skb, local->hw.extra_tx_headroom);
 868
 869         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 870         memset(mgmt, 0, 24 + 6);
 871         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 872                                           IEEE80211_STYPE_AUTH);
 873         memcpy(mgmt->da, bssid, ETH_ALEN);
 874         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 875         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 876         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 877         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 878         mgmt->u.auth.status_code = cpu_to_le16(0);
 879         if (extra)
 880                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 881
 882         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 883                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 884                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 885                 WARN_ON(err);
 886         }
 887
 888         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 889         ieee80211_tx_skb(sdata, skb);
 890 }
 891
 892 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 893                              const u8 *ie, size_t ie_len,
 894                              enum ieee80211_band band)
 895 {
 896         struct ieee80211_supported_band *sband;
 897         u8 *pos;
 898         size_t offset = 0, noffset;
 899         int supp_rates_len, i;
 900
 901         sband = local->hw.wiphy->bands[band];
 902
 903         pos = buffer;
 904
 905         supp_rates_len = min_t(int, sband->n_bitrates, 8);
 906
 907         *pos++ = WLAN_EID_SUPP_RATES;
 908         *pos++ = supp_rates_len;
 909
 910         for (i = 0; i < supp_rates_len; i++) {
 911                 int rate = sband->bitrates[i].bitrate;
 912                 *pos++ = (u8) (rate / 5);
 913         }
 914
 915         /* insert "request information" if in custom IEs */
 916         if (ie && ie_len) {
 917                 static const u8 before_extrates[] = {
 918                         WLAN_EID_SSID,
 919                         WLAN_EID_SUPP_RATES,
 920                         WLAN_EID_REQUEST,
 921                 };
 922                 noffset = ieee80211_ie_split(ie, ie_len,
 923                                              before_extrates,
 924                                              ARRAY_SIZE(before_extrates),
 925                                              offset);
 926                 memcpy(pos, ie + offset, noffset - offset);
 927                 pos += noffset - offset;
 928                 offset = noffset;
 929         }
 930
 931         if (sband->n_bitrates > i) {
 932                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 933                 *pos++ = sband->n_bitrates - i;
 934
 935                 for (; i < sband->n_bitrates; i++) {
 936                         int rate = sband->bitrates[i].bitrate;
 937                         *pos++ = (u8) (rate / 5);
 938                 }
 939         }
 940
 941         /* insert custom IEs that go before HT */
 942         if (ie && ie_len) {
 943                 static const u8 before_ht[] = {
 944                         WLAN_EID_SSID,
 945                         WLAN_EID_SUPP_RATES,
 946                         WLAN_EID_REQUEST,
 947                         WLAN_EID_EXT_SUPP_RATES,
 948                         WLAN_EID_DS_PARAMS,
 949                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 950                 };
 951                 noffset = ieee80211_ie_split(ie, ie_len,
 952                                              before_ht, ARRAY_SIZE(before_ht),
 953                                              offset);
 954                 memcpy(pos, ie + offset, noffset - offset);
 955                 pos += noffset - offset;
 956                 offset = noffset;
 957         }
 958
 959         if (sband->ht_cap.ht_supported) {
 960                 u16 cap = sband->ht_cap.cap;
 961                 __le16 tmp;
 962
 963                 if (ieee80211_disable_40mhz_24ghz &&
 964                     sband->band == IEEE80211_BAND_2GHZ) {
 965                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 966                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 967                 }
 968
 969                 *pos++ = WLAN_EID_HT_CAPABILITY;
 970                 *pos++ = sizeof(struct ieee80211_ht_cap);
 971                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 972                 tmp = cpu_to_le16(cap);
 973                 memcpy(pos, &tmp, sizeof(u16));
 974                 pos += sizeof(u16);
 975                 *pos++ = sband->ht_cap.ampdu_factor |
 976                          (sband->ht_cap.ampdu_density <<
 977                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
 978                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 979                 pos += sizeof(sband->ht_cap.mcs);
 980                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 981         }
 982
 983         /*
 984          * If adding more here, adjust code in main.c
 985          * that calculates local->scan_ies_len.
 986          */
 987
 988         /* add any remaining custom IEs */
 989         if (ie && ie_len) {
 990                 noffset = ie_len;
 991                 memcpy(pos, ie + offset, noffset - offset);
 992                 pos += noffset - offset;
 993         }
 994
 995         return pos - buffer;
 996 }
 997
 998 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 999                               const u8 *ssid, size_t ssid_len,
1000                               const u8 *ie, size_t ie_len)
1001 {
1002         struct ieee80211_local *local = sdata->local;
1003         struct sk_buff *skb;
1004         struct ieee80211_mgmt *mgmt;
1005         size_t buf_len;
1006         u8 *buf;
1007
1008         /* FIXME: come up with a proper value */
1009         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1010         if (!buf) {
1011                 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1012                        "buffer\n", sdata->name);
1013                 return;
1014         }
1015
1016         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1017                                            local->hw.conf.channel->band);
1018
1019         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1020                                      ssid, ssid_len,
1021                                      buf, buf_len);
1022
1023         if (dst) {
1024                 mgmt = (struct ieee80211_mgmt *) skb->data;
1025                 memcpy(mgmt->da, dst, ETH_ALEN);
1026                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1027         }
1028
1029         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1030         ieee80211_tx_skb(sdata, skb);
1031         kfree(buf);
1032 }
1033
1034 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1035                             struct ieee802_11_elems *elems,
1036                             enum ieee80211_band band)
1037 {
1038         struct ieee80211_supported_band *sband;
1039         struct ieee80211_rate *bitrates;
1040         size_t num_rates;
1041         u32 supp_rates;
1042         int i, j;
1043         sband = local->hw.wiphy->bands[band];
1044
1045         if (!sband) {
1046                 WARN_ON(1);
1047                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1048         }
1049
1050         bitrates = sband->bitrates;
1051         num_rates = sband->n_bitrates;
1052         supp_rates = 0;
1053         for (i = 0; i < elems->supp_rates_len +
1054                      elems->ext_supp_rates_len; i++) {
1055                 u8 rate = 0;
1056                 int own_rate;
1057                 if (i < elems->supp_rates_len)
1058                         rate = elems->supp_rates[i];
1059                 else if (elems->ext_supp_rates)
1060                         rate = elems->ext_supp_rates
1061                                 [i - elems->supp_rates_len];
1062                 own_rate = 5 * (rate & 0x7f);
1063                 for (j = 0; j < num_rates; j++)
1064                         if (bitrates[j].bitrate == own_rate)
1065                                 supp_rates |= BIT(j);
1066         }
1067         return supp_rates;
1068 }
1069
1070 void ieee80211_stop_device(struct ieee80211_local *local)
1071 {
1072         ieee80211_led_radio(local, false);
1073
1074         cancel_work_sync(&local->reconfig_filter);
1075
1076         flush_workqueue(local->workqueue);
1077         drv_stop(local);
1078 }
1079
1080 int ieee80211_reconfig(struct ieee80211_local *local)
1081 {
1082         struct ieee80211_hw *hw = &local->hw;
1083         struct ieee80211_sub_if_data *sdata;
1084         struct sta_info *sta;
1085         int res;
1086
1087         if (local->suspended)
1088                 local->resuming = true;
1089
1090         /* restart hardware */
1091         if (local->open_count) {
1092                 /*
1093                  * Upon resume hardware can sometimes be goofy due to
1094                  * various platform / driver / bus issues, so restarting
1095                  * the device may at times not work immediately. Propagate
1096                  * the error.
1097                  */
1098                 res = drv_start(local);
1099                 if (res) {
1100                         WARN(local->suspended, "Harware became unavailable "
1101                              "upon resume. This is could be a software issue"
1102                              "prior to suspend or a hardware issue\n");
1103                         return res;
1104                 }
1105
1106                 ieee80211_led_radio(local, true);
1107         }
1108
1109         /* add interfaces */
1110         list_for_each_entry(sdata, &local->interfaces, list) {
1111                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1112                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1113                     ieee80211_sdata_running(sdata))
1114                         res = drv_add_interface(local, &sdata->vif);
1115         }
1116
1117         /* add STAs back */
1118         mutex_lock(&local->sta_mtx);
1119         list_for_each_entry(sta, &local->sta_list, list) {
1120                 if (sta->uploaded) {
1121                         sdata = sta->sdata;
1122                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1123                                 sdata = container_of(sdata->bss,
1124                                              struct ieee80211_sub_if_data,
1125                                              u.ap);
1126
1127                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1128                 }
1129         }
1130         mutex_unlock(&local->sta_mtx);
1131
1132         /* Clear Suspend state so that ADDBA requests can be processed */
1133
1134         rcu_read_lock();
1135
1136         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1137                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1138                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1139                 }
1140         }
1141
1142         rcu_read_unlock();
1143
1144         /* setup RTS threshold */
1145         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1146
1147         /* reconfigure hardware */
1148         ieee80211_hw_config(local, ~0);
1149
1150         ieee80211_configure_filter(local);
1151
1152         /* Finally also reconfigure all the BSS information */
1153         list_for_each_entry(sdata, &local->interfaces, list) {
1154                 u32 changed = ~0;
1155                 if (!ieee80211_sdata_running(sdata))
1156                         continue;
1157                 switch (sdata->vif.type) {
1158                 case NL80211_IFTYPE_STATION:
1159                         /* disable beacon change bits */
1160                         changed &= ~(BSS_CHANGED_BEACON |
1161                                      BSS_CHANGED_BEACON_ENABLED);
1162                         /* fall through */
1163                 case NL80211_IFTYPE_ADHOC:
1164                 case NL80211_IFTYPE_AP:
1165                 case NL80211_IFTYPE_MESH_POINT:
1166                         ieee80211_bss_info_change_notify(sdata, changed);
1167                         break;
1168                 case NL80211_IFTYPE_WDS:
1169                         break;
1170                 case NL80211_IFTYPE_AP_VLAN:
1171                 case NL80211_IFTYPE_MONITOR:
1172                         /* ignore virtual */
1173                         break;
1174                 case NL80211_IFTYPE_UNSPECIFIED:
1175                 case __NL80211_IFTYPE_AFTER_LAST:
1176                         WARN_ON(1);
1177                         break;
1178                 }
1179         }
1180
1181         /* add back keys */
1182         list_for_each_entry(sdata, &local->interfaces, list)
1183                 if (ieee80211_sdata_running(sdata))
1184                         ieee80211_enable_keys(sdata);
1185
1186         ieee80211_wake_queues_by_reason(hw,
1187                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1188
1189         /*
1190          * If this is for hw restart things are still running.
1191          * We may want to change that later, however.
1192          */
1193         if (!local->suspended)
1194                 return 0;
1195
1196 #ifdef CONFIG_PM
1197         /* first set suspended false, then resuming */
1198         local->suspended = false;
1199         mb();
1200         local->resuming = false;
1201
1202         list_for_each_entry(sdata, &local->interfaces, list) {
1203                 switch(sdata->vif.type) {
1204                 case NL80211_IFTYPE_STATION:
1205                         ieee80211_sta_restart(sdata);
1206                         break;
1207                 case NL80211_IFTYPE_ADHOC:
1208                         ieee80211_ibss_restart(sdata);
1209                         break;
1210                 case NL80211_IFTYPE_MESH_POINT:
1211                         ieee80211_mesh_restart(sdata);
1212                         break;
1213                 default:
1214                         break;
1215                 }
1216         }
1217
1218         add_timer(&local->sta_cleanup);
1219
1220         mutex_lock(&local->sta_mtx);
1221         list_for_each_entry(sta, &local->sta_list, list)
1222                 mesh_plink_restart(sta);
1223         mutex_unlock(&local->sta_mtx);
1224 #else
1225         WARN_ON(1);
1226 #endif
1227         return 0;
1228 }
1229
1230 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1231                           enum ieee80211_smps_mode *smps_mode)
1232 {
1233         if (ifmgd->associated) {
1234                 *smps_mode = ifmgd->ap_smps;
1235
1236                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1237                         if (ifmgd->powersave)
1238                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1239                         else
1240                                 *smps_mode = IEEE80211_SMPS_OFF;
1241                 }
1242
1243                 return 1;
1244         }
1245
1246         return 0;
1247 }
1248
1249 /* must hold iflist_mtx */
1250 void ieee80211_recalc_smps(struct ieee80211_local *local,
1251                            struct ieee80211_sub_if_data *forsdata)
1252 {
1253         struct ieee80211_sub_if_data *sdata;
1254         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1255         int count = 0;
1256
1257         if (forsdata)
1258                 WARN_ON(!mutex_is_locked(&forsdata->u.mgd.mtx));
1259
1260         WARN_ON(!mutex_is_locked(&local->iflist_mtx));
1261
1262         /*
1263          * This function could be improved to handle multiple
1264          * interfaces better, but right now it makes any
1265          * non-station interfaces force SM PS to be turned
1266          * off. If there are multiple station interfaces it
1267          * could also use the best possible mode, e.g. if
1268          * one is in static and the other in dynamic then
1269          * dynamic is ok.
1270          */
1271
1272         list_for_each_entry(sdata, &local->interfaces, list) {
1273                 if (!netif_running(sdata->dev))
1274                         continue;
1275                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1276                         goto set;
1277                 if (sdata != forsdata) {
1278                         /*
1279                          * This nested is ok -- we are holding the iflist_mtx
1280                          * so can't get here twice or so. But it's required
1281                          * since normally we acquire it first and then the
1282                          * iflist_mtx.
1283                          */
1284                         mutex_lock_nested(&sdata->u.mgd.mtx, SINGLE_DEPTH_NESTING);
1285                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1286                         mutex_unlock(&sdata->u.mgd.mtx);
1287                 } else
1288                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1289
1290                 if (count > 1) {
1291                         smps_mode = IEEE80211_SMPS_OFF;
1292                         break;
1293                 }
1294         }
1295
1296         if (smps_mode == local->smps_mode)
1297                 return;
1298
1299  set:
1300         local->smps_mode = smps_mode;
1301         /* changed flag is auto-detected for this */
1302         ieee80211_hw_config(local, 0);
1303 }
1304
1305 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1306 {
1307         int i;
1308
1309         for (i = 0; i < n_ids; i++)
1310                 if (ids[i] == id)
1311                         return true;
1312         return false;
1313 }
1314
1315 /**
1316  * ieee80211_ie_split - split an IE buffer according to ordering
1317  *
1318  * @ies: the IE buffer
1319  * @ielen: the length of the IE buffer
1320  * @ids: an array with element IDs that are allowed before
1321  *      the split
1322  * @n_ids: the size of the element ID array
1323  * @offset: offset where to start splitting in the buffer
1324  *
1325  * This function splits an IE buffer by updating the @offset
1326  * variable to point to the location where the buffer should be
1327  * split.
1328  *
1329  * It assumes that the given IE buffer is well-formed, this
1330  * has to be guaranteed by the caller!
1331  *
1332  * It also assumes that the IEs in the buffer are ordered
1333  * correctly, if not the result of using this function will not
1334  * be ordered correctly either, i.e. it does no reordering.
1335  *
1336  * The function returns the offset where the next part of the
1337  * buffer starts, which may be @ielen if the entire (remainder)
1338  * of the buffer should be used.
1339  */
1340 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1341                           const u8 *ids, int n_ids, size_t offset)
1342 {
1343         size_t pos = offset;
1344
1345         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1346                 pos += 2 + ies[pos + 1];
1347
1348         return pos;
1349 }
1350
1351 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1352 {
1353         size_t pos = offset;
1354
1355         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1356                 pos += 2 + ies[pos + 1];
1357
1358         return pos;
1359 }