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
 272         if (WARN_ON(queue >= hw->queues))
 273                 return;
 274
 275         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 276
 277         if (local->queue_stop_reasons[queue] != 0)
 278                 /* someone still has this queue stopped */
 279                 return;
 280
 281         if (!skb_queue_empty(&local->pending[queue]))
 282                 tasklet_schedule(&local->tx_pending_tasklet);
 283 }
 284
 285 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 286                                     enum queue_stop_reason reason)
 287 {
 288         struct ieee80211_local *local = hw_to_local(hw);
 289         unsigned long flags;
 290
 291         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 292         __ieee80211_wake_queue(hw, queue, reason);
 293         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 294 }
 295
 296 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 297 {
 298         ieee80211_wake_queue_by_reason(hw, queue,
 299                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 300 }
 301 EXPORT_SYMBOL(ieee80211_wake_queue);
 302
 303 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 304                                    enum queue_stop_reason reason)
 305 {
 306         struct ieee80211_local *local = hw_to_local(hw);
 307
 308         if (WARN_ON(queue >= hw->queues))
 309                 return;
 310
 311         __set_bit(reason, &local->queue_stop_reasons[queue]);
 312 }
 313
 314 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 315                                     enum queue_stop_reason reason)
 316 {
 317         struct ieee80211_local *local = hw_to_local(hw);
 318         unsigned long flags;
 319
 320         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 321         __ieee80211_stop_queue(hw, queue, reason);
 322         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 323 }
 324
 325 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 326 {
 327         ieee80211_stop_queue_by_reason(hw, queue,
 328                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 329 }
 330 EXPORT_SYMBOL(ieee80211_stop_queue);
 331
 332 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 333                                struct sk_buff *skb)
 334 {
 335         struct ieee80211_hw *hw = &local->hw;
 336         unsigned long flags;
 337         int queue = skb_get_queue_mapping(skb);
 338         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 339
 340         if (WARN_ON(!info->control.vif)) {
 341                 kfree_skb(skb);
 342                 return;
 343         }
 344
 345         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 346         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 347         __skb_queue_tail(&local->pending[queue], skb);
 348         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 349         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 350 }
 351
 352 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 353                                struct sk_buff_head *skbs)
 354 {
 355         struct ieee80211_hw *hw = &local->hw;
 356         struct sk_buff *skb;
 357         unsigned long flags;
 358         int queue, ret = 0, i;
 359
 360         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 361         for (i = 0; i < hw->queues; i++)
 362                 __ieee80211_stop_queue(hw, i,
 363                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 364
 365         while ((skb = skb_dequeue(skbs))) {
 366                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 367
 368                 if (WARN_ON(!info->control.vif)) {
 369                         kfree_skb(skb);
 370                         continue;
 371                 }
 372
 373                 ret++;
 374                 queue = skb_get_queue_mapping(skb);
 375                 __skb_queue_tail(&local->pending[queue], skb);
 376         }
 377
 378         for (i = 0; i < hw->queues; i++)
 379                 __ieee80211_wake_queue(hw, i,
 380                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 381         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 382
 383         return ret;
 384 }
 385
 386 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 387                                     enum queue_stop_reason reason)
 388 {
 389         struct ieee80211_local *local = hw_to_local(hw);
 390         unsigned long flags;
 391         int i;
 392
 393         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 394
 395         for (i = 0; i < hw->queues; i++)
 396                 __ieee80211_stop_queue(hw, i, reason);
 397
 398         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 399 }
 400
 401 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 402 {
 403         ieee80211_stop_queues_by_reason(hw,
 404                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 405 }
 406 EXPORT_SYMBOL(ieee80211_stop_queues);
 407
 408 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 409 {
 410         struct ieee80211_local *local = hw_to_local(hw);
 411         unsigned long flags;
 412         int ret;
 413
 414         if (WARN_ON(queue >= hw->queues))
 415                 return true;
 416
 417         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 418         ret = !!local->queue_stop_reasons[queue];
 419         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 420         return ret;
 421 }
 422 EXPORT_SYMBOL(ieee80211_queue_stopped);
 423
 424 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 425                                      enum queue_stop_reason reason)
 426 {
 427         struct ieee80211_local *local = hw_to_local(hw);
 428         unsigned long flags;
 429         int i;
 430
 431         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 432
 433         for (i = 0; i < hw->queues; i++)
 434                 __ieee80211_wake_queue(hw, i, reason);
 435
 436         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 437 }
 438
 439 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 440 {
 441         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 442 }
 443 EXPORT_SYMBOL(ieee80211_wake_queues);
 444
 445 void ieee80211_iterate_active_interfaces(
 446         struct ieee80211_hw *hw,
 447         void (*iterator)(void *data, u8 *mac,
 448                          struct ieee80211_vif *vif),
 449         void *data)
 450 {
 451         struct ieee80211_local *local = hw_to_local(hw);
 452         struct ieee80211_sub_if_data *sdata;
 453
 454         mutex_lock(&local->iflist_mtx);
 455
 456         list_for_each_entry(sdata, &local->interfaces, list) {
 457                 switch (sdata->vif.type) {
 458                 case __NL80211_IFTYPE_AFTER_LAST:
 459                 case NL80211_IFTYPE_UNSPECIFIED:
 460                 case NL80211_IFTYPE_MONITOR:
 461                 case NL80211_IFTYPE_AP_VLAN:
 462                         continue;
 463                 case NL80211_IFTYPE_AP:
 464                 case NL80211_IFTYPE_STATION:
 465                 case NL80211_IFTYPE_ADHOC:
 466                 case NL80211_IFTYPE_WDS:
 467                 case NL80211_IFTYPE_MESH_POINT:
 468                         break;
 469                 }
 470                 if (ieee80211_sdata_running(sdata))
 471                         iterator(data, sdata->vif.addr,
 472                                  &sdata->vif);
 473         }
 474
 475         mutex_unlock(&local->iflist_mtx);
 476 }
 477 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 478
 479 void ieee80211_iterate_active_interfaces_atomic(
 480         struct ieee80211_hw *hw,
 481         void (*iterator)(void *data, u8 *mac,
 482                          struct ieee80211_vif *vif),
 483         void *data)
 484 {
 485         struct ieee80211_local *local = hw_to_local(hw);
 486         struct ieee80211_sub_if_data *sdata;
 487
 488         rcu_read_lock();
 489
 490         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 491                 switch (sdata->vif.type) {
 492                 case __NL80211_IFTYPE_AFTER_LAST:
 493                 case NL80211_IFTYPE_UNSPECIFIED:
 494                 case NL80211_IFTYPE_MONITOR:
 495                 case NL80211_IFTYPE_AP_VLAN:
 496                         continue;
 497                 case NL80211_IFTYPE_AP:
 498                 case NL80211_IFTYPE_STATION:
 499                 case NL80211_IFTYPE_ADHOC:
 500                 case NL80211_IFTYPE_WDS:
 501                 case NL80211_IFTYPE_MESH_POINT:
 502                         break;
 503                 }
 504                 if (ieee80211_sdata_running(sdata))
 505                         iterator(data, sdata->vif.addr,
 506                                  &sdata->vif);
 507         }
 508
 509         rcu_read_unlock();
 510 }
 511 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 512
 513 /*
 514  * Nothing should have been stuffed into the workqueue during
 515  * the suspend->resume cycle. If this WARN is seen then there
 516  * is a bug with either the driver suspend or something in
 517  * mac80211 stuffing into the workqueue which we haven't yet
 518  * cleared during mac80211's suspend cycle.
 519  */
 520 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 521 {
 522         if (WARN(local->suspended && !local->resuming,
 523                  "queueing ieee80211 work while going to suspend\n"))
 524                 return false;
 525
 526         return true;
 527 }
 528
 529 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 530 {
 531         struct ieee80211_local *local = hw_to_local(hw);
 532
 533         if (!ieee80211_can_queue_work(local))
 534                 return;
 535
 536         queue_work(local->workqueue, work);
 537 }
 538 EXPORT_SYMBOL(ieee80211_queue_work);
 539
 540 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 541                                   struct delayed_work *dwork,
 542                                   unsigned long delay)
 543 {
 544         struct ieee80211_local *local = hw_to_local(hw);
 545
 546         if (!ieee80211_can_queue_work(local))
 547                 return;
 548
 549         queue_delayed_work(local->workqueue, dwork, delay);
 550 }
 551 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 552
 553 void ieee802_11_parse_elems(u8 *start, size_t len,
 554                             struct ieee802_11_elems *elems)
 555 {
 556         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 557 }
 558
 559 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 560                                struct ieee802_11_elems *elems,
 561                                u64 filter, u32 crc)
 562 {
 563         size_t left = len;
 564         u8 *pos = start;
 565         bool calc_crc = filter != 0;
 566
 567         memset(elems, 0, sizeof(*elems));
 568         elems->ie_start = start;
 569         elems->total_len = len;
 570
 571         while (left >= 2) {
 572                 u8 id, elen;
 573
 574                 id = *pos++;
 575                 elen = *pos++;
 576                 left -= 2;
 577
 578                 if (elen > left)
 579                         break;
 580
 581                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 582                         crc = crc32_be(crc, pos - 2, elen + 2);
 583
 584                 switch (id) {
 585                 case WLAN_EID_SSID:
 586                         elems->ssid = pos;
 587                         elems->ssid_len = elen;
 588                         break;
 589                 case WLAN_EID_SUPP_RATES:
 590                         elems->supp_rates = pos;
 591                         elems->supp_rates_len = elen;
 592                         break;
 593                 case WLAN_EID_FH_PARAMS:
 594                         elems->fh_params = pos;
 595                         elems->fh_params_len = elen;
 596                         break;
 597                 case WLAN_EID_DS_PARAMS:
 598                         elems->ds_params = pos;
 599                         elems->ds_params_len = elen;
 600                         break;
 601                 case WLAN_EID_CF_PARAMS:
 602                         elems->cf_params = pos;
 603                         elems->cf_params_len = elen;
 604                         break;
 605                 case WLAN_EID_TIM:
 606                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 607                                 elems->tim = (void *)pos;
 608                                 elems->tim_len = elen;
 609                         }
 610                         break;
 611                 case WLAN_EID_IBSS_PARAMS:
 612                         elems->ibss_params = pos;
 613                         elems->ibss_params_len = elen;
 614                         break;
 615                 case WLAN_EID_CHALLENGE:
 616                         elems->challenge = pos;
 617                         elems->challenge_len = elen;
 618                         break;
 619                 case WLAN_EID_VENDOR_SPECIFIC:
 620                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 621                             pos[2] == 0xf2) {
 622                                 /* Microsoft OUI (00:50:F2) */
 623
 624                                 if (calc_crc)
 625                                         crc = crc32_be(crc, pos - 2, elen + 2);
 626
 627                                 if (pos[3] == 1) {
 628                                         /* OUI Type 1 - WPA IE */
 629                                         elems->wpa = pos;
 630                                         elems->wpa_len = elen;
 631                                 } else if (elen >= 5 && pos[3] == 2) {
 632                                         /* OUI Type 2 - WMM IE */
 633                                         if (pos[4] == 0) {
 634                                                 elems->wmm_info = pos;
 635                                                 elems->wmm_info_len = elen;
 636                                         } else if (pos[4] == 1) {
 637                                                 elems->wmm_param = pos;
 638                                                 elems->wmm_param_len = elen;
 639                                         }
 640                                 }
 641                         }
 642                         break;
 643                 case WLAN_EID_RSN:
 644                         elems->rsn = pos;
 645                         elems->rsn_len = elen;
 646                         break;
 647                 case WLAN_EID_ERP_INFO:
 648                         elems->erp_info = pos;
 649                         elems->erp_info_len = elen;
 650                         break;
 651                 case WLAN_EID_EXT_SUPP_RATES:
 652                         elems->ext_supp_rates = pos;
 653                         elems->ext_supp_rates_len = elen;
 654                         break;
 655                 case WLAN_EID_HT_CAPABILITY:
 656                         if (elen >= sizeof(struct ieee80211_ht_cap))
 657                                 elems->ht_cap_elem = (void *)pos;
 658                         break;
 659                 case WLAN_EID_HT_INFORMATION:
 660                         if (elen >= sizeof(struct ieee80211_ht_info))
 661                                 elems->ht_info_elem = (void *)pos;
 662                         break;
 663                 case WLAN_EID_MESH_ID:
 664                         elems->mesh_id = pos;
 665                         elems->mesh_id_len = elen;
 666                         break;
 667                 case WLAN_EID_MESH_CONFIG:
 668                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 669                                 elems->mesh_config = (void *)pos;
 670                         break;
 671                 case WLAN_EID_PEER_LINK:
 672                         elems->peer_link = pos;
 673                         elems->peer_link_len = elen;
 674                         break;
 675                 case WLAN_EID_PREQ:
 676                         elems->preq = pos;
 677                         elems->preq_len = elen;
 678                         break;
 679                 case WLAN_EID_PREP:
 680                         elems->prep = pos;
 681                         elems->prep_len = elen;
 682                         break;
 683                 case WLAN_EID_PERR:
 684                         elems->perr = pos;
 685                         elems->perr_len = elen;
 686                         break;
 687                 case WLAN_EID_RANN:
 688                         if (elen >= sizeof(struct ieee80211_rann_ie))
 689                                 elems->rann = (void *)pos;
 690                         break;
 691                 case WLAN_EID_CHANNEL_SWITCH:
 692                         elems->ch_switch_elem = pos;
 693                         elems->ch_switch_elem_len = elen;
 694                         break;
 695                 case WLAN_EID_QUIET:
 696                         if (!elems->quiet_elem) {
 697                                 elems->quiet_elem = pos;
 698                                 elems->quiet_elem_len = elen;
 699                         }
 700                         elems->num_of_quiet_elem++;
 701                         break;
 702                 case WLAN_EID_COUNTRY:
 703                         elems->country_elem = pos;
 704                         elems->country_elem_len = elen;
 705                         break;
 706                 case WLAN_EID_PWR_CONSTRAINT:
 707                         elems->pwr_constr_elem = pos;
 708                         elems->pwr_constr_elem_len = elen;
 709                         break;
 710                 case WLAN_EID_TIMEOUT_INTERVAL:
 711                         elems->timeout_int = pos;
 712                         elems->timeout_int_len = elen;
 713                         break;
 714                 default:
 715                         break;
 716                 }
 717
 718                 left -= elen;
 719                 pos += elen;
 720         }
 721
 722         return crc;
 723 }
 724
 725 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 726 {
 727         struct ieee80211_local *local = sdata->local;
 728         struct ieee80211_tx_queue_params qparam;
 729         int queue;
 730         bool use_11b;
 731         int aCWmin, aCWmax;
 732
 733         if (!local->ops->conf_tx)
 734                 return;
 735
 736         memset(&qparam, 0, sizeof(qparam));
 737
 738         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 739                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 740
 741         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 742                 /* Set defaults according to 802.11-2007 Table 7-37 */
 743                 aCWmax = 1023;
 744                 if (use_11b)
 745                         aCWmin = 31;
 746                 else
 747                         aCWmin = 15;
 748
 749                 switch (queue) {
 750                 case 3: /* AC_BK */
 751                         qparam.cw_max = aCWmax;
 752                         qparam.cw_min = aCWmin;
 753                         qparam.txop = 0;
 754                         qparam.aifs = 7;
 755                         break;
 756                 default: /* never happens but let's not leave undefined */
 757                 case 2: /* AC_BE */
 758                         qparam.cw_max = aCWmax;
 759                         qparam.cw_min = aCWmin;
 760                         qparam.txop = 0;
 761                         qparam.aifs = 3;
 762                         break;
 763                 case 1: /* AC_VI */
 764                         qparam.cw_max = aCWmin;
 765                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 766                         if (use_11b)
 767                                 qparam.txop = 6016/32;
 768                         else
 769                                 qparam.txop = 3008/32;
 770                         qparam.aifs = 2;
 771                         break;
 772                 case 0: /* AC_VO */
 773                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 774                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 775                         if (use_11b)
 776                                 qparam.txop = 3264/32;
 777                         else
 778                                 qparam.txop = 1504/32;
 779                         qparam.aifs = 2;
 780                         break;
 781                 }
 782
 783                 drv_conf_tx(local, queue, &qparam);
 784         }
 785 }
 786
 787 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 788                                   const size_t supp_rates_len,
 789                                   const u8 *supp_rates)
 790 {
 791         struct ieee80211_local *local = sdata->local;
 792         int i, have_higher_than_11mbit = 0;
 793
 794         /* cf. IEEE 802.11 9.2.12 */
 795         for (i = 0; i < supp_rates_len; i++)
 796                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 797                         have_higher_than_11mbit = 1;
 798
 799         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 800             have_higher_than_11mbit)
 801                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 802         else
 803                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 804
 805         ieee80211_set_wmm_default(sdata);
 806 }
 807
 808 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 809                               enum ieee80211_band band)
 810 {
 811         struct ieee80211_supported_band *sband;
 812         struct ieee80211_rate *bitrates;
 813         u32 mandatory_rates;
 814         enum ieee80211_rate_flags mandatory_flag;
 815         int i;
 816
 817         sband = local->hw.wiphy->bands[band];
 818         if (!sband) {
 819                 WARN_ON(1);
 820                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 821         }
 822
 823         if (band == IEEE80211_BAND_2GHZ)
 824                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 825         else
 826                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 827
 828         bitrates = sband->bitrates;
 829         mandatory_rates = 0;
 830         for (i = 0; i < sband->n_bitrates; i++)
 831                 if (bitrates[i].flags & mandatory_flag)
 832                         mandatory_rates |= BIT(i);
 833         return mandatory_rates;
 834 }
 835
 836 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 837                          u16 transaction, u16 auth_alg,
 838                          u8 *extra, size_t extra_len, const u8 *bssid,
 839                          const u8 *key, u8 key_len, u8 key_idx)
 840 {
 841         struct ieee80211_local *local = sdata->local;
 842         struct sk_buff *skb;
 843         struct ieee80211_mgmt *mgmt;
 844         int err;
 845
 846         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 847                             sizeof(*mgmt) + 6 + extra_len);
 848         if (!skb) {
 849                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 850                        "frame\n", sdata->name);
 851                 return;
 852         }
 853         skb_reserve(skb, local->hw.extra_tx_headroom);
 854
 855         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 856         memset(mgmt, 0, 24 + 6);
 857         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 858                                           IEEE80211_STYPE_AUTH);
 859         memcpy(mgmt->da, bssid, ETH_ALEN);
 860         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 861         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 862         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 863         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 864         mgmt->u.auth.status_code = cpu_to_le16(0);
 865         if (extra)
 866                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 867
 868         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 869                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 870                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 871                 WARN_ON(err);
 872         }
 873
 874         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 875         ieee80211_tx_skb(sdata, skb);
 876 }
 877
 878 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 879                              const u8 *ie, size_t ie_len,
 880                              enum ieee80211_band band)
 881 {
 882         struct ieee80211_supported_band *sband;
 883         u8 *pos;
 884         size_t offset = 0, noffset;
 885         int supp_rates_len, i;
 886
 887         sband = local->hw.wiphy->bands[band];
 888
 889         pos = buffer;
 890
 891         supp_rates_len = min_t(int, sband->n_bitrates, 8);
 892
 893         *pos++ = WLAN_EID_SUPP_RATES;
 894         *pos++ = supp_rates_len;
 895
 896         for (i = 0; i < supp_rates_len; i++) {
 897                 int rate = sband->bitrates[i].bitrate;
 898                 *pos++ = (u8) (rate / 5);
 899         }
 900
 901         /* insert "request information" if in custom IEs */
 902         if (ie && ie_len) {
 903                 static const u8 before_extrates[] = {
 904                         WLAN_EID_SSID,
 905                         WLAN_EID_SUPP_RATES,
 906                         WLAN_EID_REQUEST,
 907                 };
 908                 noffset = ieee80211_ie_split(ie, ie_len,
 909                                              before_extrates,
 910                                              ARRAY_SIZE(before_extrates),
 911                                              offset);
 912                 memcpy(pos, ie + offset, noffset - offset);
 913                 pos += noffset - offset;
 914                 offset = noffset;
 915         }
 916
 917         if (sband->n_bitrates > i) {
 918                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 919                 *pos++ = sband->n_bitrates - i;
 920
 921                 for (; i < sband->n_bitrates; i++) {
 922                         int rate = sband->bitrates[i].bitrate;
 923                         *pos++ = (u8) (rate / 5);
 924                 }
 925         }
 926
 927         /* insert custom IEs that go before HT */
 928         if (ie && ie_len) {
 929                 static const u8 before_ht[] = {
 930                         WLAN_EID_SSID,
 931                         WLAN_EID_SUPP_RATES,
 932                         WLAN_EID_REQUEST,
 933                         WLAN_EID_EXT_SUPP_RATES,
 934                         WLAN_EID_DS_PARAMS,
 935                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 936                 };
 937                 noffset = ieee80211_ie_split(ie, ie_len,
 938                                              before_ht, ARRAY_SIZE(before_ht),
 939                                              offset);
 940                 memcpy(pos, ie + offset, noffset - offset);
 941                 pos += noffset - offset;
 942                 offset = noffset;
 943         }
 944
 945         if (sband->ht_cap.ht_supported) {
 946                 u16 cap = sband->ht_cap.cap;
 947                 __le16 tmp;
 948
 949                 if (ieee80211_disable_40mhz_24ghz &&
 950                     sband->band == IEEE80211_BAND_2GHZ) {
 951                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 952                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 953                 }
 954
 955                 *pos++ = WLAN_EID_HT_CAPABILITY;
 956                 *pos++ = sizeof(struct ieee80211_ht_cap);
 957                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 958                 tmp = cpu_to_le16(cap);
 959                 memcpy(pos, &tmp, sizeof(u16));
 960                 pos += sizeof(u16);
 961                 *pos++ = sband->ht_cap.ampdu_factor |
 962                          (sband->ht_cap.ampdu_density <<
 963                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
 964                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 965                 pos += sizeof(sband->ht_cap.mcs);
 966                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 967         }
 968
 969         /*
 970          * If adding more here, adjust code in main.c
 971          * that calculates local->scan_ies_len.
 972          */
 973
 974         /* add any remaining custom IEs */
 975         if (ie && ie_len) {
 976                 noffset = ie_len;
 977                 memcpy(pos, ie + offset, noffset - offset);
 978                 pos += noffset - offset;
 979         }
 980
 981         return pos - buffer;
 982 }
 983
 984 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 985                               const u8 *ssid, size_t ssid_len,
 986                               const u8 *ie, size_t ie_len)
 987 {
 988         struct ieee80211_local *local = sdata->local;
 989         struct sk_buff *skb;
 990         struct ieee80211_mgmt *mgmt;
 991         u8 *pos;
 992
 993         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 994                             ie_len);
 995         if (!skb) {
 996                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 997                        "request\n", sdata->name);
 998                 return;
 999         }
1000         skb_reserve(skb, local->hw.extra_tx_headroom);
1001
1002         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1003         memset(mgmt, 0, 24);
1004         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1005                                           IEEE80211_STYPE_PROBE_REQ);
1006         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1007         if (dst) {
1008                 memcpy(mgmt->da, dst, ETH_ALEN);
1009                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1010         } else {
1011                 memset(mgmt->da, 0xff, ETH_ALEN);
1012                 memset(mgmt->bssid, 0xff, ETH_ALEN);
1013         }
1014         pos = skb_put(skb, 2 + ssid_len);
1015         *pos++ = WLAN_EID_SSID;
1016         *pos++ = ssid_len;
1017         memcpy(pos, ssid, ssid_len);
1018         pos += ssid_len;
1019
1020         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len,
1021                                               local->hw.conf.channel->band));
1022
1023         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1024         ieee80211_tx_skb(sdata, skb);
1025 }
1026
1027 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1028                             struct ieee802_11_elems *elems,
1029                             enum ieee80211_band band)
1030 {
1031         struct ieee80211_supported_band *sband;
1032         struct ieee80211_rate *bitrates;
1033         size_t num_rates;
1034         u32 supp_rates;
1035         int i, j;
1036         sband = local->hw.wiphy->bands[band];
1037
1038         if (!sband) {
1039                 WARN_ON(1);
1040                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1041         }
1042
1043         bitrates = sband->bitrates;
1044         num_rates = sband->n_bitrates;
1045         supp_rates = 0;
1046         for (i = 0; i < elems->supp_rates_len +
1047                      elems->ext_supp_rates_len; i++) {
1048                 u8 rate = 0;
1049                 int own_rate;
1050                 if (i < elems->supp_rates_len)
1051                         rate = elems->supp_rates[i];
1052                 else if (elems->ext_supp_rates)
1053                         rate = elems->ext_supp_rates
1054                                 [i - elems->supp_rates_len];
1055                 own_rate = 5 * (rate & 0x7f);
1056                 for (j = 0; j < num_rates; j++)
1057                         if (bitrates[j].bitrate == own_rate)
1058                                 supp_rates |= BIT(j);
1059         }
1060         return supp_rates;
1061 }
1062
1063 void ieee80211_stop_device(struct ieee80211_local *local)
1064 {
1065         ieee80211_led_radio(local, false);
1066
1067         cancel_work_sync(&local->reconfig_filter);
1068         drv_stop(local);
1069
1070         flush_workqueue(local->workqueue);
1071 }
1072
1073 int ieee80211_reconfig(struct ieee80211_local *local)
1074 {
1075         struct ieee80211_hw *hw = &local->hw;
1076         struct ieee80211_sub_if_data *sdata;
1077         struct sta_info *sta;
1078         unsigned long flags;
1079         int res;
1080
1081         if (local->suspended)
1082                 local->resuming = true;
1083
1084         /* restart hardware */
1085         if (local->open_count) {
1086                 /*
1087                  * Upon resume hardware can sometimes be goofy due to
1088                  * various platform / driver / bus issues, so restarting
1089                  * the device may at times not work immediately. Propagate
1090                  * the error.
1091                  */
1092                 res = drv_start(local);
1093                 if (res) {
1094                         WARN(local->suspended, "Harware became unavailable "
1095                              "upon resume. This is could be a software issue"
1096                              "prior to suspend or a hardware issue\n");
1097                         return res;
1098                 }
1099
1100                 ieee80211_led_radio(local, true);
1101         }
1102
1103         /* add interfaces */
1104         list_for_each_entry(sdata, &local->interfaces, list) {
1105                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1106                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1107                     ieee80211_sdata_running(sdata))
1108                         res = drv_add_interface(local, &sdata->vif);
1109         }
1110
1111         /* add STAs back */
1112         if (local->ops->sta_notify) {
1113                 spin_lock_irqsave(&local->sta_lock, flags);
1114                 list_for_each_entry(sta, &local->sta_list, list) {
1115                         sdata = sta->sdata;
1116                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1117                                 sdata = container_of(sdata->bss,
1118                                              struct ieee80211_sub_if_data,
1119                                              u.ap);
1120
1121                         drv_sta_notify(local, sdata, STA_NOTIFY_ADD,
1122                                        &sta->sta);
1123                 }
1124                 spin_unlock_irqrestore(&local->sta_lock, flags);
1125         }
1126
1127         /* Clear Suspend state so that ADDBA requests can be processed */
1128
1129         rcu_read_lock();
1130
1131         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1132                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1133                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1134                 }
1135         }
1136
1137         rcu_read_unlock();
1138
1139         /* setup RTS threshold */
1140         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1141
1142         /* reconfigure hardware */
1143         ieee80211_hw_config(local, ~0);
1144
1145         ieee80211_configure_filter(local);
1146
1147         /* Finally also reconfigure all the BSS information */
1148         list_for_each_entry(sdata, &local->interfaces, list) {
1149                 u32 changed = ~0;
1150                 if (!ieee80211_sdata_running(sdata))
1151                         continue;
1152                 switch (sdata->vif.type) {
1153                 case NL80211_IFTYPE_STATION:
1154                         /* disable beacon change bits */
1155                         changed &= ~(BSS_CHANGED_BEACON |
1156                                      BSS_CHANGED_BEACON_ENABLED);
1157                         /* fall through */
1158                 case NL80211_IFTYPE_ADHOC:
1159                 case NL80211_IFTYPE_AP:
1160                 case NL80211_IFTYPE_MESH_POINT:
1161                         ieee80211_bss_info_change_notify(sdata, changed);
1162                         break;
1163                 case NL80211_IFTYPE_WDS:
1164                         break;
1165                 case NL80211_IFTYPE_AP_VLAN:
1166                 case NL80211_IFTYPE_MONITOR:
1167                         /* ignore virtual */
1168                         break;
1169                 case NL80211_IFTYPE_UNSPECIFIED:
1170                 case __NL80211_IFTYPE_AFTER_LAST:
1171                         WARN_ON(1);
1172                         break;
1173                 }
1174         }
1175
1176         /* add back keys */
1177         list_for_each_entry(sdata, &local->interfaces, list)
1178                 if (ieee80211_sdata_running(sdata))
1179                         ieee80211_enable_keys(sdata);
1180
1181         ieee80211_wake_queues_by_reason(hw,
1182                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1183
1184         /*
1185          * If this is for hw restart things are still running.
1186          * We may want to change that later, however.
1187          */
1188         if (!local->suspended)
1189                 return 0;
1190
1191 #ifdef CONFIG_PM
1192         /* first set suspended false, then resuming */
1193         local->suspended = false;
1194         mb();
1195         local->resuming = false;
1196
1197         list_for_each_entry(sdata, &local->interfaces, list) {
1198                 switch(sdata->vif.type) {
1199                 case NL80211_IFTYPE_STATION:
1200                         ieee80211_sta_restart(sdata);
1201                         break;
1202                 case NL80211_IFTYPE_ADHOC:
1203                         ieee80211_ibss_restart(sdata);
1204                         break;
1205                 case NL80211_IFTYPE_MESH_POINT:
1206                         ieee80211_mesh_restart(sdata);
1207                         break;
1208                 default:
1209                         break;
1210                 }
1211         }
1212
1213         add_timer(&local->sta_cleanup);
1214
1215         spin_lock_irqsave(&local->sta_lock, flags);
1216         list_for_each_entry(sta, &local->sta_list, list)
1217                 mesh_plink_restart(sta);
1218         spin_unlock_irqrestore(&local->sta_lock, flags);
1219 #else
1220         WARN_ON(1);
1221 #endif
1222         return 0;
1223 }
1224
1225 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1226                           enum ieee80211_smps_mode *smps_mode)
1227 {
1228         if (ifmgd->associated) {
1229                 *smps_mode = ifmgd->ap_smps;
1230
1231                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1232                         if (ifmgd->powersave)
1233                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1234                         else
1235                                 *smps_mode = IEEE80211_SMPS_OFF;
1236                 }
1237
1238                 return 1;
1239         }
1240
1241         return 0;
1242 }
1243
1244 /* must hold iflist_mtx */
1245 void ieee80211_recalc_smps(struct ieee80211_local *local,
1246                            struct ieee80211_sub_if_data *forsdata)
1247 {
1248         struct ieee80211_sub_if_data *sdata;
1249         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1250         int count = 0;
1251
1252         if (forsdata)
1253                 WARN_ON(!mutex_is_locked(&forsdata->u.mgd.mtx));
1254
1255         WARN_ON(!mutex_is_locked(&local->iflist_mtx));
1256
1257         /*
1258          * This function could be improved to handle multiple
1259          * interfaces better, but right now it makes any
1260          * non-station interfaces force SM PS to be turned
1261          * off. If there are multiple station interfaces it
1262          * could also use the best possible mode, e.g. if
1263          * one is in static and the other in dynamic then
1264          * dynamic is ok.
1265          */
1266
1267         list_for_each_entry(sdata, &local->interfaces, list) {
1268                 if (!netif_running(sdata->dev))
1269                         continue;
1270                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1271                         goto set;
1272                 if (sdata != forsdata) {
1273                         /*
1274                          * This nested is ok -- we are holding the iflist_mtx
1275                          * so can't get here twice or so. But it's required
1276                          * since normally we acquire it first and then the
1277                          * iflist_mtx.
1278                          */
1279                         mutex_lock_nested(&sdata->u.mgd.mtx, SINGLE_DEPTH_NESTING);
1280                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1281                         mutex_unlock(&sdata->u.mgd.mtx);
1282                 } else
1283                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1284
1285                 if (count > 1) {
1286                         smps_mode = IEEE80211_SMPS_OFF;
1287                         break;
1288                 }
1289         }
1290
1291         if (smps_mode == local->smps_mode)
1292                 return;
1293
1294  set:
1295         local->smps_mode = smps_mode;
1296         /* changed flag is auto-detected for this */
1297         ieee80211_hw_config(local, 0);
1298 }
1299
1300 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1301 {
1302         int i;
1303
1304         for (i = 0; i < n_ids; i++)
1305                 if (ids[i] == id)
1306                         return true;
1307         return false;
1308 }
1309
1310 /**
1311  * ieee80211_ie_split - split an IE buffer according to ordering
1312  *
1313  * @ies: the IE buffer
1314  * @ielen: the length of the IE buffer
1315  * @ids: an array with element IDs that are allowed before
1316  *      the split
1317  * @n_ids: the size of the element ID array
1318  * @offset: offset where to start splitting in the buffer
1319  *
1320  * This function splits an IE buffer by updating the @offset
1321  * variable to point to the location where the buffer should be
1322  * split.
1323  *
1324  * It assumes that the given IE buffer is well-formed, this
1325  * has to be guaranteed by the caller!
1326  *
1327  * It also assumes that the IEs in the buffer are ordered
1328  * correctly, if not the result of using this function will not
1329  * be ordered correctly either, i.e. it does no reordering.
1330  *
1331  * The function returns the offset where the next part of the
1332  * buffer starts, which may be @ielen if the entire (remainder)
1333  * of the buffer should be used.
1334  */
1335 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1336                           const u8 *ids, int n_ids, size_t offset)
1337 {
1338         size_t pos = offset;
1339
1340         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1341                 pos += 2 + ies[pos + 1];
1342
1343         return pos;
1344 }
1345
1346 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1347 {
1348         size_t pos = offset;
1349
1350         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1351                 pos += 2 + ies[pos + 1];
1352
1353         return pos;
1354 }