net/mac80211/util.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * utilities for mac80211
  12  */
  13
  14 #include <net/mac80211.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/bitmap.h>
  22 #include <linux/crc32.h>
  23 #include <net/net_namespace.h>
  24 #include <net/cfg80211.h>
  25 #include <net/rtnetlink.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wme.h"
  32 #include "led.h"
  33 #include "wep.h"
  34
  35 /* privid for wiphys to determine whether they belong to us or not */
  36 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  37
  38 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  39 {
  40         struct ieee80211_local *local;
  41         BUG_ON(!wiphy);
  42
  43         local = wiphy_priv(wiphy);
  44         return &local->hw;
  45 }
  46 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  47
  48 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  49                         enum nl80211_iftype type)
  50 {
  51         __le16 fc = hdr->frame_control;
  52
  53          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  54         if (len < 16)
  55                 return NULL;
  56
  57         if (ieee80211_is_data(fc)) {
  58                 if (len < 24) /* drop incorrect hdr len (data) */
  59                         return NULL;
  60
  61                 if (ieee80211_has_a4(fc))
  62                         return NULL;
  63                 if (ieee80211_has_tods(fc))
  64                         return hdr->addr1;
  65                 if (ieee80211_has_fromds(fc))
  66                         return hdr->addr2;
  67
  68                 return hdr->addr3;
  69         }
  70
  71         if (ieee80211_is_mgmt(fc)) {
  72                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  73                         return NULL;
  74                 return hdr->addr3;
  75         }
  76
  77         if (ieee80211_is_ctl(fc)) {
  78                 if(ieee80211_is_pspoll(fc))
  79                         return hdr->addr1;
  80
  81                 if (ieee80211_is_back_req(fc)) {
  82                         switch (type) {
  83                         case NL80211_IFTYPE_STATION:
  84                                 return hdr->addr2;
  85                         case NL80211_IFTYPE_AP:
  86                         case NL80211_IFTYPE_AP_VLAN:
  87                                 return hdr->addr1;
  88                         default:
  89                                 break; /* fall through to the return */
  90                         }
  91                 }
  92         }
  93
  94         return NULL;
  95 }
  96
  97 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  98 {
  99         struct sk_buff *skb = tx->skb;
 100         struct ieee80211_hdr *hdr;
 101
 102         do {
 103                 hdr = (struct ieee80211_hdr *) skb->data;
 104                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 105         } while ((skb = skb->next));
 106 }
 107
 108 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 109                              int rate, int erp, int short_preamble)
 110 {
 111         int dur;
 112
 113         /* calculate duration (in microseconds, rounded up to next higher
 114          * integer if it includes a fractional microsecond) to send frame of
 115          * len bytes (does not include FCS) at the given rate. Duration will
 116          * also include SIFS.
 117          *
 118          * rate is in 100 kbps, so divident is multiplied by 10 in the
 119          * DIV_ROUND_UP() operations.
 120          */
 121
 122         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 123                 /*
 124                  * OFDM:
 125                  *
 126                  * N_DBPS = DATARATE x 4
 127                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 128                  *      (16 = SIGNAL time, 6 = tail bits)
 129                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 130                  *
 131                  * T_SYM = 4 usec
 132                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 133                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 134                  *      signal ext = 6 usec
 135                  */
 136                 dur = 16; /* SIFS + signal ext */
 137                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 138                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 139                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 140                                         4 * rate); /* T_SYM x N_SYM */
 141         } else {
 142                 /*
 143                  * 802.11b or 802.11g with 802.11b compatibility:
 144                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 145                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 146                  *
 147                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 148                  * aSIFSTime = 10 usec
 149                  * aPreambleLength = 144 usec or 72 usec with short preamble
 150                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 151                  */
 152                 dur = 10; /* aSIFSTime = 10 usec */
 153                 dur += short_preamble ? (72 + 24) : (144 + 48);
 154
 155                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 156         }
 157
 158         return dur;
 159 }
 160
 161 /* Exported duration function for driver use */
 162 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 163                                         struct ieee80211_vif *vif,
 164                                         size_t frame_len,
 165                                         struct ieee80211_rate *rate)
 166 {
 167         struct ieee80211_local *local = hw_to_local(hw);
 168         struct ieee80211_sub_if_data *sdata;
 169         u16 dur;
 170         int erp;
 171         bool short_preamble = false;
 172
 173         erp = 0;
 174         if (vif) {
 175                 sdata = vif_to_sdata(vif);
 176                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 177                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 178                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 179         }
 180
 181         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 182                                        short_preamble);
 183
 184         return cpu_to_le16(dur);
 185 }
 186 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 187
 188 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 189                               struct ieee80211_vif *vif, size_t frame_len,
 190                               const struct ieee80211_tx_info *frame_txctl)
 191 {
 192         struct ieee80211_local *local = hw_to_local(hw);
 193         struct ieee80211_rate *rate;
 194         struct ieee80211_sub_if_data *sdata;
 195         bool short_preamble;
 196         int erp;
 197         u16 dur;
 198         struct ieee80211_supported_band *sband;
 199
 200         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 201
 202         short_preamble = false;
 203
 204         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 205
 206         erp = 0;
 207         if (vif) {
 208                 sdata = vif_to_sdata(vif);
 209                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 210                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 211                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 212         }
 213
 214         /* CTS duration */
 215         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 216                                        erp, short_preamble);
 217         /* Data frame duration */
 218         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 219                                         erp, short_preamble);
 220         /* ACK duration */
 221         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 222                                         erp, short_preamble);
 223
 224         return cpu_to_le16(dur);
 225 }
 226 EXPORT_SYMBOL(ieee80211_rts_duration);
 227
 228 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 229                                     struct ieee80211_vif *vif,
 230                                     size_t frame_len,
 231                                     const struct ieee80211_tx_info *frame_txctl)
 232 {
 233         struct ieee80211_local *local = hw_to_local(hw);
 234         struct ieee80211_rate *rate;
 235         struct ieee80211_sub_if_data *sdata;
 236         bool short_preamble;
 237         int erp;
 238         u16 dur;
 239         struct ieee80211_supported_band *sband;
 240
 241         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 242
 243         short_preamble = false;
 244
 245         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 246         erp = 0;
 247         if (vif) {
 248                 sdata = vif_to_sdata(vif);
 249                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 250                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 251                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 252         }
 253
 254         /* Data frame duration */
 255         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 256                                        erp, short_preamble);
 257         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 258                 /* ACK duration */
 259                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 260                                                 erp, short_preamble);
 261         }
 262
 263         return cpu_to_le16(dur);
 264 }
 265 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 266
 267 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 268                                    enum queue_stop_reason reason)
 269 {
 270         struct ieee80211_local *local = hw_to_local(hw);
 271         struct ieee80211_sub_if_data *sdata;
 272
 273         trace_wake_queue(local, queue, reason);
 274
 275         if (WARN_ON(queue >= hw->queues))
 276                 return;
 277
 278         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 279
 280         if (local->queue_stop_reasons[queue] != 0)
 281                 /* someone still has this queue stopped */
 282                 return;
 283
 284         if (skb_queue_empty(&local->pending[queue])) {
 285                 rcu_read_lock();
 286                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 287                         if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 288                                 continue;
 289                         netif_wake_subqueue(sdata->dev, queue);
 290                 }
 291                 rcu_read_unlock();
 292         } else
 293                 tasklet_schedule(&local->tx_pending_tasklet);
 294 }
 295
 296 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 297                                     enum queue_stop_reason reason)
 298 {
 299         struct ieee80211_local *local = hw_to_local(hw);
 300         unsigned long flags;
 301
 302         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 303         __ieee80211_wake_queue(hw, queue, reason);
 304         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 305 }
 306
 307 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 308 {
 309         ieee80211_wake_queue_by_reason(hw, queue,
 310                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 311 }
 312 EXPORT_SYMBOL(ieee80211_wake_queue);
 313
 314 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 315                                    enum queue_stop_reason reason)
 316 {
 317         struct ieee80211_local *local = hw_to_local(hw);
 318         struct ieee80211_sub_if_data *sdata;
 319
 320         trace_stop_queue(local, queue, reason);
 321
 322         if (WARN_ON(queue >= hw->queues))
 323                 return;
 324
 325         __set_bit(reason, &local->queue_stop_reasons[queue]);
 326
 327         rcu_read_lock();
 328         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 329                 netif_stop_subqueue(sdata->dev, queue);
 330         rcu_read_unlock();
 331 }
 332
 333 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 334                                     enum queue_stop_reason reason)
 335 {
 336         struct ieee80211_local *local = hw_to_local(hw);
 337         unsigned long flags;
 338
 339         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 340         __ieee80211_stop_queue(hw, queue, reason);
 341         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 342 }
 343
 344 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 345 {
 346         ieee80211_stop_queue_by_reason(hw, queue,
 347                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 348 }
 349 EXPORT_SYMBOL(ieee80211_stop_queue);
 350
 351 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 352                                struct sk_buff *skb)
 353 {
 354         struct ieee80211_hw *hw = &local->hw;
 355         unsigned long flags;
 356         int queue = skb_get_queue_mapping(skb);
 357         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 358
 359         if (WARN_ON(!info->control.vif)) {
 360                 kfree_skb(skb);
 361                 return;
 362         }
 363
 364         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 365         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 366         __skb_queue_tail(&local->pending[queue], skb);
 367         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 368         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 369 }
 370
 371 int ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 372                                   struct sk_buff_head *skbs,
 373                                   void (*fn)(void *data), void *data)
 374 {
 375         struct ieee80211_hw *hw = &local->hw;
 376         struct sk_buff *skb;
 377         unsigned long flags;
 378         int queue, ret = 0, i;
 379
 380         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 381         for (i = 0; i < hw->queues; i++)
 382                 __ieee80211_stop_queue(hw, i,
 383                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 384
 385         while ((skb = skb_dequeue(skbs))) {
 386                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 387
 388                 if (WARN_ON(!info->control.vif)) {
 389                         kfree_skb(skb);
 390                         continue;
 391                 }
 392
 393                 ret++;
 394                 queue = skb_get_queue_mapping(skb);
 395                 __skb_queue_tail(&local->pending[queue], skb);
 396         }
 397
 398         if (fn)
 399                 fn(data);
 400
 401         for (i = 0; i < hw->queues; i++)
 402                 __ieee80211_wake_queue(hw, i,
 403                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 404         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 405
 406         return ret;
 407 }
 408
 409 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 410                                struct sk_buff_head *skbs)
 411 {
 412         return ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
 413 }
 414
 415 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 416                                     enum queue_stop_reason reason)
 417 {
 418         struct ieee80211_local *local = hw_to_local(hw);
 419         unsigned long flags;
 420         int i;
 421
 422         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 423
 424         for (i = 0; i < hw->queues; i++)
 425                 __ieee80211_stop_queue(hw, i, reason);
 426
 427         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 428 }
 429
 430 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 431 {
 432         ieee80211_stop_queues_by_reason(hw,
 433                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 434 }
 435 EXPORT_SYMBOL(ieee80211_stop_queues);
 436
 437 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 438 {
 439         struct ieee80211_local *local = hw_to_local(hw);
 440         unsigned long flags;
 441         int ret;
 442
 443         if (WARN_ON(queue >= hw->queues))
 444                 return true;
 445
 446         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 447         ret = !!local->queue_stop_reasons[queue];
 448         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 449         return ret;
 450 }
 451 EXPORT_SYMBOL(ieee80211_queue_stopped);
 452
 453 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 454                                      enum queue_stop_reason reason)
 455 {
 456         struct ieee80211_local *local = hw_to_local(hw);
 457         unsigned long flags;
 458         int i;
 459
 460         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 461
 462         for (i = 0; i < hw->queues; i++)
 463                 __ieee80211_wake_queue(hw, i, reason);
 464
 465         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 466 }
 467
 468 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 469 {
 470         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 471 }
 472 EXPORT_SYMBOL(ieee80211_wake_queues);
 473
 474 void ieee80211_iterate_active_interfaces(
 475         struct ieee80211_hw *hw,
 476         void (*iterator)(void *data, u8 *mac,
 477                          struct ieee80211_vif *vif),
 478         void *data)
 479 {
 480         struct ieee80211_local *local = hw_to_local(hw);
 481         struct ieee80211_sub_if_data *sdata;
 482
 483         mutex_lock(&local->iflist_mtx);
 484
 485         list_for_each_entry(sdata, &local->interfaces, list) {
 486                 switch (sdata->vif.type) {
 487                 case NL80211_IFTYPE_MONITOR:
 488                 case NL80211_IFTYPE_AP_VLAN:
 489                         continue;
 490                 default:
 491                         break;
 492                 }
 493                 if (ieee80211_sdata_running(sdata))
 494                         iterator(data, sdata->vif.addr,
 495                                  &sdata->vif);
 496         }
 497
 498         mutex_unlock(&local->iflist_mtx);
 499 }
 500 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 501
 502 void ieee80211_iterate_active_interfaces_atomic(
 503         struct ieee80211_hw *hw,
 504         void (*iterator)(void *data, u8 *mac,
 505                          struct ieee80211_vif *vif),
 506         void *data)
 507 {
 508         struct ieee80211_local *local = hw_to_local(hw);
 509         struct ieee80211_sub_if_data *sdata;
 510
 511         rcu_read_lock();
 512
 513         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 514                 switch (sdata->vif.type) {
 515                 case NL80211_IFTYPE_MONITOR:
 516                 case NL80211_IFTYPE_AP_VLAN:
 517                         continue;
 518                 default:
 519                         break;
 520                 }
 521                 if (ieee80211_sdata_running(sdata))
 522                         iterator(data, sdata->vif.addr,
 523                                  &sdata->vif);
 524         }
 525
 526         rcu_read_unlock();
 527 }
 528 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 529
 530 /*
 531  * Nothing should have been stuffed into the workqueue during
 532  * the suspend->resume cycle. If this WARN is seen then there
 533  * is a bug with either the driver suspend or something in
 534  * mac80211 stuffing into the workqueue which we haven't yet
 535  * cleared during mac80211's suspend cycle.
 536  */
 537 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 538 {
 539         if (WARN(local->suspended && !local->resuming,
 540                  "queueing ieee80211 work while going to suspend\n"))
 541                 return false;
 542
 543         return true;
 544 }
 545
 546 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 547 {
 548         struct ieee80211_local *local = hw_to_local(hw);
 549
 550         if (!ieee80211_can_queue_work(local))
 551                 return;
 552
 553         queue_work(local->workqueue, work);
 554 }
 555 EXPORT_SYMBOL(ieee80211_queue_work);
 556
 557 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 558                                   struct delayed_work *dwork,
 559                                   unsigned long delay)
 560 {
 561         struct ieee80211_local *local = hw_to_local(hw);
 562
 563         if (!ieee80211_can_queue_work(local))
 564                 return;
 565
 566         queue_delayed_work(local->workqueue, dwork, delay);
 567 }
 568 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 569
 570 void ieee802_11_parse_elems(u8 *start, size_t len,
 571                             struct ieee802_11_elems *elems)
 572 {
 573         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 574 }
 575
 576 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 577                                struct ieee802_11_elems *elems,
 578                                u64 filter, u32 crc)
 579 {
 580         size_t left = len;
 581         u8 *pos = start;
 582         bool calc_crc = filter != 0;
 583
 584         memset(elems, 0, sizeof(*elems));
 585         elems->ie_start = start;
 586         elems->total_len = len;
 587
 588         while (left >= 2) {
 589                 u8 id, elen;
 590
 591                 id = *pos++;
 592                 elen = *pos++;
 593                 left -= 2;
 594
 595                 if (elen > left)
 596                         break;
 597
 598                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 599                         crc = crc32_be(crc, pos - 2, elen + 2);
 600
 601                 switch (id) {
 602                 case WLAN_EID_SSID:
 603                         elems->ssid = pos;
 604                         elems->ssid_len = elen;
 605                         break;
 606                 case WLAN_EID_SUPP_RATES:
 607                         elems->supp_rates = pos;
 608                         elems->supp_rates_len = elen;
 609                         break;
 610                 case WLAN_EID_FH_PARAMS:
 611                         elems->fh_params = pos;
 612                         elems->fh_params_len = elen;
 613                         break;
 614                 case WLAN_EID_DS_PARAMS:
 615                         elems->ds_params = pos;
 616                         elems->ds_params_len = elen;
 617                         break;
 618                 case WLAN_EID_CF_PARAMS:
 619                         elems->cf_params = pos;
 620                         elems->cf_params_len = elen;
 621                         break;
 622                 case WLAN_EID_TIM:
 623                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 624                                 elems->tim = (void *)pos;
 625                                 elems->tim_len = elen;
 626                         }
 627                         break;
 628                 case WLAN_EID_IBSS_PARAMS:
 629                         elems->ibss_params = pos;
 630                         elems->ibss_params_len = elen;
 631                         break;
 632                 case WLAN_EID_CHALLENGE:
 633                         elems->challenge = pos;
 634                         elems->challenge_len = elen;
 635                         break;
 636                 case WLAN_EID_VENDOR_SPECIFIC:
 637                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 638                             pos[2] == 0xf2) {
 639                                 /* Microsoft OUI (00:50:F2) */
 640
 641                                 if (calc_crc)
 642                                         crc = crc32_be(crc, pos - 2, elen + 2);
 643
 644                                 if (pos[3] == 1) {
 645                                         /* OUI Type 1 - WPA IE */
 646                                         elems->wpa = pos;
 647                                         elems->wpa_len = elen;
 648                                 } else if (elen >= 5 && pos[3] == 2) {
 649                                         /* OUI Type 2 - WMM IE */
 650                                         if (pos[4] == 0) {
 651                                                 elems->wmm_info = pos;
 652                                                 elems->wmm_info_len = elen;
 653                                         } else if (pos[4] == 1) {
 654                                                 elems->wmm_param = pos;
 655                                                 elems->wmm_param_len = elen;
 656                                         }
 657                                 }
 658                         }
 659                         break;
 660                 case WLAN_EID_RSN:
 661                         elems->rsn = pos;
 662                         elems->rsn_len = elen;
 663                         break;
 664                 case WLAN_EID_ERP_INFO:
 665                         elems->erp_info = pos;
 666                         elems->erp_info_len = elen;
 667                         break;
 668                 case WLAN_EID_EXT_SUPP_RATES:
 669                         elems->ext_supp_rates = pos;
 670                         elems->ext_supp_rates_len = elen;
 671                         break;
 672                 case WLAN_EID_HT_CAPABILITY:
 673                         if (elen >= sizeof(struct ieee80211_ht_cap))
 674                                 elems->ht_cap_elem = (void *)pos;
 675                         break;
 676                 case WLAN_EID_HT_INFORMATION:
 677                         if (elen >= sizeof(struct ieee80211_ht_info))
 678                                 elems->ht_info_elem = (void *)pos;
 679                         break;
 680                 case WLAN_EID_MESH_ID:
 681                         elems->mesh_id = pos;
 682                         elems->mesh_id_len = elen;
 683                         break;
 684                 case WLAN_EID_MESH_CONFIG:
 685                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 686                                 elems->mesh_config = (void *)pos;
 687                         break;
 688                 case WLAN_EID_PEER_LINK:
 689                         elems->peer_link = pos;
 690                         elems->peer_link_len = elen;
 691                         break;
 692                 case WLAN_EID_PREQ:
 693                         elems->preq = pos;
 694                         elems->preq_len = elen;
 695                         break;
 696                 case WLAN_EID_PREP:
 697                         elems->prep = pos;
 698                         elems->prep_len = elen;
 699                         break;
 700                 case WLAN_EID_PERR:
 701                         elems->perr = pos;
 702                         elems->perr_len = elen;
 703                         break;
 704                 case WLAN_EID_RANN:
 705                         if (elen >= sizeof(struct ieee80211_rann_ie))
 706                                 elems->rann = (void *)pos;
 707                         break;
 708                 case WLAN_EID_CHANNEL_SWITCH:
 709                         elems->ch_switch_elem = pos;
 710                         elems->ch_switch_elem_len = elen;
 711                         break;
 712                 case WLAN_EID_QUIET:
 713                         if (!elems->quiet_elem) {
 714                                 elems->quiet_elem = pos;
 715                                 elems->quiet_elem_len = elen;
 716                         }
 717                         elems->num_of_quiet_elem++;
 718                         break;
 719                 case WLAN_EID_COUNTRY:
 720                         elems->country_elem = pos;
 721                         elems->country_elem_len = elen;
 722                         break;
 723                 case WLAN_EID_PWR_CONSTRAINT:
 724                         elems->pwr_constr_elem = pos;
 725                         elems->pwr_constr_elem_len = elen;
 726                         break;
 727                 case WLAN_EID_TIMEOUT_INTERVAL:
 728                         elems->timeout_int = pos;
 729                         elems->timeout_int_len = elen;
 730                         break;
 731                 default:
 732                         break;
 733                 }
 734
 735                 left -= elen;
 736                 pos += elen;
 737         }
 738
 739         return crc;
 740 }
 741
 742 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 743 {
 744         struct ieee80211_local *local = sdata->local;
 745         struct ieee80211_tx_queue_params qparam;
 746         int queue;
 747         bool use_11b;
 748         int aCWmin, aCWmax;
 749
 750         if (!local->ops->conf_tx)
 751                 return;
 752
 753         memset(&qparam, 0, sizeof(qparam));
 754
 755         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 756                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 757
 758         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 759                 /* Set defaults according to 802.11-2007 Table 7-37 */
 760                 aCWmax = 1023;
 761                 if (use_11b)
 762                         aCWmin = 31;
 763                 else
 764                         aCWmin = 15;
 765
 766                 switch (queue) {
 767                 case 3: /* AC_BK */
 768                         qparam.cw_max = aCWmax;
 769                         qparam.cw_min = aCWmin;
 770                         qparam.txop = 0;
 771                         qparam.aifs = 7;
 772                         break;
 773                 default: /* never happens but let's not leave undefined */
 774                 case 2: /* AC_BE */
 775                         qparam.cw_max = aCWmax;
 776                         qparam.cw_min = aCWmin;
 777                         qparam.txop = 0;
 778                         qparam.aifs = 3;
 779                         break;
 780                 case 1: /* AC_VI */
 781                         qparam.cw_max = aCWmin;
 782                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 783                         if (use_11b)
 784                                 qparam.txop = 6016/32;
 785                         else
 786                                 qparam.txop = 3008/32;
 787                         qparam.aifs = 2;
 788                         break;
 789                 case 0: /* AC_VO */
 790                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 791                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 792                         if (use_11b)
 793                                 qparam.txop = 3264/32;
 794                         else
 795                                 qparam.txop = 1504/32;
 796                         qparam.aifs = 2;
 797                         break;
 798                 }
 799
 800                 qparam.uapsd = false;
 801
 802                 drv_conf_tx(local, queue, &qparam);
 803         }
 804
 805         /* after reinitialize QoS TX queues setting to default,
 806          * disable QoS at all */
 807
 808         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 809                 sdata->vif.bss_conf.qos =
 810                         sdata->vif.type != NL80211_IFTYPE_STATION;
 811                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 812         }
 813 }
 814
 815 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 816                                   const size_t supp_rates_len,
 817                                   const u8 *supp_rates)
 818 {
 819         struct ieee80211_local *local = sdata->local;
 820         int i, have_higher_than_11mbit = 0;
 821
 822         /* cf. IEEE 802.11 9.2.12 */
 823         for (i = 0; i < supp_rates_len; i++)
 824                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 825                         have_higher_than_11mbit = 1;
 826
 827         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 828             have_higher_than_11mbit)
 829                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 830         else
 831                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 832
 833         ieee80211_set_wmm_default(sdata);
 834 }
 835
 836 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 837                               enum ieee80211_band band)
 838 {
 839         struct ieee80211_supported_band *sband;
 840         struct ieee80211_rate *bitrates;
 841         u32 mandatory_rates;
 842         enum ieee80211_rate_flags mandatory_flag;
 843         int i;
 844
 845         sband = local->hw.wiphy->bands[band];
 846         if (!sband) {
 847                 WARN_ON(1);
 848                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 849         }
 850
 851         if (band == IEEE80211_BAND_2GHZ)
 852                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 853         else
 854                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 855
 856         bitrates = sband->bitrates;
 857         mandatory_rates = 0;
 858         for (i = 0; i < sband->n_bitrates; i++)
 859                 if (bitrates[i].flags & mandatory_flag)
 860                         mandatory_rates |= BIT(i);
 861         return mandatory_rates;
 862 }
 863
 864 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 865                          u16 transaction, u16 auth_alg,
 866                          u8 *extra, size_t extra_len, const u8 *bssid,
 867                          const u8 *key, u8 key_len, u8 key_idx)
 868 {
 869         struct ieee80211_local *local = sdata->local;
 870         struct sk_buff *skb;
 871         struct ieee80211_mgmt *mgmt;
 872         int err;
 873
 874         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 875                             sizeof(*mgmt) + 6 + extra_len);
 876         if (!skb) {
 877                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 878                        "frame\n", sdata->name);
 879                 return;
 880         }
 881         skb_reserve(skb, local->hw.extra_tx_headroom);
 882
 883         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 884         memset(mgmt, 0, 24 + 6);
 885         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 886                                           IEEE80211_STYPE_AUTH);
 887         memcpy(mgmt->da, bssid, ETH_ALEN);
 888         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 889         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 890         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 891         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 892         mgmt->u.auth.status_code = cpu_to_le16(0);
 893         if (extra)
 894                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 895
 896         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 897                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 898                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 899                 WARN_ON(err);
 900         }
 901
 902         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 903         ieee80211_tx_skb(sdata, skb);
 904 }
 905
 906 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 907                              const u8 *ie, size_t ie_len,
 908                              enum ieee80211_band band, u32 rate_mask,
 909                              u8 channel)
 910 {
 911         struct ieee80211_supported_band *sband;
 912         u8 *pos;
 913         size_t offset = 0, noffset;
 914         int supp_rates_len, i;
 915         u8 rates[32];
 916         int num_rates;
 917         int ext_rates_len;
 918
 919         sband = local->hw.wiphy->bands[band];
 920
 921         pos = buffer;
 922
 923         num_rates = 0;
 924         for (i = 0; i < sband->n_bitrates; i++) {
 925                 if ((BIT(i) & rate_mask) == 0)
 926                         continue; /* skip rate */
 927                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
 928         }
 929
 930         supp_rates_len = min_t(int, num_rates, 8);
 931
 932         *pos++ = WLAN_EID_SUPP_RATES;
 933         *pos++ = supp_rates_len;
 934         memcpy(pos, rates, supp_rates_len);
 935         pos += supp_rates_len;
 936
 937         /* insert "request information" if in custom IEs */
 938         if (ie && ie_len) {
 939                 static const u8 before_extrates[] = {
 940                         WLAN_EID_SSID,
 941                         WLAN_EID_SUPP_RATES,
 942                         WLAN_EID_REQUEST,
 943                 };
 944                 noffset = ieee80211_ie_split(ie, ie_len,
 945                                              before_extrates,
 946                                              ARRAY_SIZE(before_extrates),
 947                                              offset);
 948                 memcpy(pos, ie + offset, noffset - offset);
 949                 pos += noffset - offset;
 950                 offset = noffset;
 951         }
 952
 953         ext_rates_len = num_rates - supp_rates_len;
 954         if (ext_rates_len > 0) {
 955                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 956                 *pos++ = ext_rates_len;
 957                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
 958                 pos += ext_rates_len;
 959         }
 960
 961         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
 962                 *pos++ = WLAN_EID_DS_PARAMS;
 963                 *pos++ = 1;
 964                 *pos++ = channel;
 965         }
 966
 967         /* insert custom IEs that go before HT */
 968         if (ie && ie_len) {
 969                 static const u8 before_ht[] = {
 970                         WLAN_EID_SSID,
 971                         WLAN_EID_SUPP_RATES,
 972                         WLAN_EID_REQUEST,
 973                         WLAN_EID_EXT_SUPP_RATES,
 974                         WLAN_EID_DS_PARAMS,
 975                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 976                 };
 977                 noffset = ieee80211_ie_split(ie, ie_len,
 978                                              before_ht, ARRAY_SIZE(before_ht),
 979                                              offset);
 980                 memcpy(pos, ie + offset, noffset - offset);
 981                 pos += noffset - offset;
 982                 offset = noffset;
 983         }
 984
 985         if (sband->ht_cap.ht_supported) {
 986                 u16 cap = sband->ht_cap.cap;
 987                 __le16 tmp;
 988
 989                 if (ieee80211_disable_40mhz_24ghz &&
 990                     sband->band == IEEE80211_BAND_2GHZ) {
 991                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 992                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 993                 }
 994
 995                 *pos++ = WLAN_EID_HT_CAPABILITY;
 996                 *pos++ = sizeof(struct ieee80211_ht_cap);
 997                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 998                 tmp = cpu_to_le16(cap);
 999                 memcpy(pos, &tmp, sizeof(u16));
1000                 pos += sizeof(u16);
1001                 *pos++ = sband->ht_cap.ampdu_factor |
1002                          (sband->ht_cap.ampdu_density <<
1003                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1004                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
1005                 pos += sizeof(sband->ht_cap.mcs);
1006                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
1007         }
1008
1009         /*
1010          * If adding more here, adjust code in main.c
1011          * that calculates local->scan_ies_len.
1012          */
1013
1014         /* add any remaining custom IEs */
1015         if (ie && ie_len) {
1016                 noffset = ie_len;
1017                 memcpy(pos, ie + offset, noffset - offset);
1018                 pos += noffset - offset;
1019         }
1020
1021         return pos - buffer;
1022 }
1023
1024 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1025                                           u8 *dst,
1026                                           const u8 *ssid, size_t ssid_len,
1027                                           const u8 *ie, size_t ie_len)
1028 {
1029         struct ieee80211_local *local = sdata->local;
1030         struct sk_buff *skb;
1031         struct ieee80211_mgmt *mgmt;
1032         size_t buf_len;
1033         u8 *buf;
1034         u8 chan;
1035
1036         /* FIXME: come up with a proper value */
1037         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1038         if (!buf) {
1039                 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1040                        "buffer\n", sdata->name);
1041                 return NULL;
1042         }
1043
1044         chan = ieee80211_frequency_to_channel(
1045                 local->hw.conf.channel->center_freq);
1046
1047         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1048                                            local->hw.conf.channel->band,
1049                                            sdata->rc_rateidx_mask
1050                                            [local->hw.conf.channel->band],
1051                                            chan);
1052
1053         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1054                                      ssid, ssid_len,
1055                                      buf, buf_len);
1056
1057         if (dst) {
1058                 mgmt = (struct ieee80211_mgmt *) skb->data;
1059                 memcpy(mgmt->da, dst, ETH_ALEN);
1060                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1061         }
1062
1063         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1064         kfree(buf);
1065
1066         return skb;
1067 }
1068
1069 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1070                               const u8 *ssid, size_t ssid_len,
1071                               const u8 *ie, size_t ie_len)
1072 {
1073         struct sk_buff *skb;
1074
1075         skb = ieee80211_build_probe_req(sdata, dst, ssid, ssid_len, ie, ie_len);
1076         if (skb)
1077                 ieee80211_tx_skb(sdata, skb);
1078 }
1079
1080 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1081                             struct ieee802_11_elems *elems,
1082                             enum ieee80211_band band)
1083 {
1084         struct ieee80211_supported_band *sband;
1085         struct ieee80211_rate *bitrates;
1086         size_t num_rates;
1087         u32 supp_rates;
1088         int i, j;
1089         sband = local->hw.wiphy->bands[band];
1090
1091         if (!sband) {
1092                 WARN_ON(1);
1093                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1094         }
1095
1096         bitrates = sband->bitrates;
1097         num_rates = sband->n_bitrates;
1098         supp_rates = 0;
1099         for (i = 0; i < elems->supp_rates_len +
1100                      elems->ext_supp_rates_len; i++) {
1101                 u8 rate = 0;
1102                 int own_rate;
1103                 if (i < elems->supp_rates_len)
1104                         rate = elems->supp_rates[i];
1105                 else if (elems->ext_supp_rates)
1106                         rate = elems->ext_supp_rates
1107                                 [i - elems->supp_rates_len];
1108                 own_rate = 5 * (rate & 0x7f);
1109                 for (j = 0; j < num_rates; j++)
1110                         if (bitrates[j].bitrate == own_rate)
1111                                 supp_rates |= BIT(j);
1112         }
1113         return supp_rates;
1114 }
1115
1116 void ieee80211_stop_device(struct ieee80211_local *local)
1117 {
1118         ieee80211_led_radio(local, false);
1119         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1120
1121         cancel_work_sync(&local->reconfig_filter);
1122
1123         flush_workqueue(local->workqueue);
1124         drv_stop(local);
1125 }
1126
1127 int ieee80211_reconfig(struct ieee80211_local *local)
1128 {
1129         struct ieee80211_hw *hw = &local->hw;
1130         struct ieee80211_sub_if_data *sdata;
1131         struct sta_info *sta;
1132         int res;
1133
1134         if (local->suspended)
1135                 local->resuming = true;
1136
1137         /* restart hardware */
1138         if (local->open_count) {
1139                 /*
1140                  * Upon resume hardware can sometimes be goofy due to
1141                  * various platform / driver / bus issues, so restarting
1142                  * the device may at times not work immediately. Propagate
1143                  * the error.
1144                  */
1145                 res = drv_start(local);
1146                 if (res) {
1147                         WARN(local->suspended, "Hardware became unavailable "
1148                              "upon resume. This could be a software issue "
1149                              "prior to suspend or a hardware issue.\n");
1150                         return res;
1151                 }
1152
1153                 ieee80211_led_radio(local, true);
1154                 ieee80211_mod_tpt_led_trig(local,
1155                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1156         }
1157
1158         /* add interfaces */
1159         list_for_each_entry(sdata, &local->interfaces, list) {
1160                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1161                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1162                     ieee80211_sdata_running(sdata))
1163                         res = drv_add_interface(local, &sdata->vif);
1164         }
1165
1166         /* add STAs back */
1167         mutex_lock(&local->sta_mtx);
1168         list_for_each_entry(sta, &local->sta_list, list) {
1169                 if (sta->uploaded) {
1170                         sdata = sta->sdata;
1171                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1172                                 sdata = container_of(sdata->bss,
1173                                              struct ieee80211_sub_if_data,
1174                                              u.ap);
1175
1176                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1177                 }
1178         }
1179         mutex_unlock(&local->sta_mtx);
1180
1181         /* setup fragmentation threshold */
1182         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1183
1184         /* setup RTS threshold */
1185         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1186
1187         /* reconfigure hardware */
1188         ieee80211_hw_config(local, ~0);
1189
1190         ieee80211_configure_filter(local);
1191
1192         /* Finally also reconfigure all the BSS information */
1193         list_for_each_entry(sdata, &local->interfaces, list) {
1194                 u32 changed;
1195
1196                 if (!ieee80211_sdata_running(sdata))
1197                         continue;
1198
1199                 /* common change flags for all interface types */
1200                 changed = BSS_CHANGED_ERP_CTS_PROT |
1201                           BSS_CHANGED_ERP_PREAMBLE |
1202                           BSS_CHANGED_ERP_SLOT |
1203                           BSS_CHANGED_HT |
1204                           BSS_CHANGED_BASIC_RATES |
1205                           BSS_CHANGED_BEACON_INT |
1206                           BSS_CHANGED_BSSID |
1207                           BSS_CHANGED_CQM |
1208                           BSS_CHANGED_QOS;
1209
1210                 switch (sdata->vif.type) {
1211                 case NL80211_IFTYPE_STATION:
1212                         changed |= BSS_CHANGED_ASSOC;
1213                         mutex_lock(&sdata->u.mgd.mtx);
1214                         ieee80211_bss_info_change_notify(sdata, changed);
1215                         mutex_unlock(&sdata->u.mgd.mtx);
1216                         break;
1217                 case NL80211_IFTYPE_ADHOC:
1218                         changed |= BSS_CHANGED_IBSS;
1219                         /* fall through */
1220                 case NL80211_IFTYPE_AP:
1221                 case NL80211_IFTYPE_MESH_POINT:
1222                         changed |= BSS_CHANGED_BEACON |
1223                                    BSS_CHANGED_BEACON_ENABLED;
1224                         ieee80211_bss_info_change_notify(sdata, changed);
1225                         break;
1226                 case NL80211_IFTYPE_WDS:
1227                         break;
1228                 case NL80211_IFTYPE_AP_VLAN:
1229                 case NL80211_IFTYPE_MONITOR:
1230                         /* ignore virtual */
1231                         break;
1232                 case NL80211_IFTYPE_UNSPECIFIED:
1233                 case NUM_NL80211_IFTYPES:
1234                 case NL80211_IFTYPE_P2P_CLIENT:
1235                 case NL80211_IFTYPE_P2P_GO:
1236                         WARN_ON(1);
1237                         break;
1238                 }
1239         }
1240
1241         /*
1242          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1243          * sessions can be established after a resume.
1244          *
1245          * Also tear down aggregation sessions since reconfiguring
1246          * them in a hardware restart scenario is not easily done
1247          * right now, and the hardware will have lost information
1248          * about the sessions, but we and the AP still think they
1249          * are active. This is really a workaround though.
1250          */
1251         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1252                 mutex_lock(&local->sta_mtx);
1253
1254                 list_for_each_entry(sta, &local->sta_list, list) {
1255                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1256                         clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1257                 }
1258
1259                 mutex_unlock(&local->sta_mtx);
1260         }
1261
1262         /* add back keys */
1263         list_for_each_entry(sdata, &local->interfaces, list)
1264                 if (ieee80211_sdata_running(sdata))
1265                         ieee80211_enable_keys(sdata);
1266
1267         ieee80211_wake_queues_by_reason(hw,
1268                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1269
1270         /*
1271          * If this is for hw restart things are still running.
1272          * We may want to change that later, however.
1273          */
1274         if (!local->suspended)
1275                 return 0;
1276
1277 #ifdef CONFIG_PM
1278         /* first set suspended false, then resuming */
1279         local->suspended = false;
1280         mb();
1281         local->resuming = false;
1282
1283         list_for_each_entry(sdata, &local->interfaces, list) {
1284                 switch(sdata->vif.type) {
1285                 case NL80211_IFTYPE_STATION:
1286                         ieee80211_sta_restart(sdata);
1287                         break;
1288                 case NL80211_IFTYPE_ADHOC:
1289                         ieee80211_ibss_restart(sdata);
1290                         break;
1291                 case NL80211_IFTYPE_MESH_POINT:
1292                         ieee80211_mesh_restart(sdata);
1293                         break;
1294                 default:
1295                         break;
1296                 }
1297         }
1298
1299         add_timer(&local->sta_cleanup);
1300
1301         mutex_lock(&local->sta_mtx);
1302         list_for_each_entry(sta, &local->sta_list, list)
1303                 mesh_plink_restart(sta);
1304         mutex_unlock(&local->sta_mtx);
1305 #else
1306         WARN_ON(1);
1307 #endif
1308         return 0;
1309 }
1310
1311 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1312                           enum ieee80211_smps_mode *smps_mode)
1313 {
1314         if (ifmgd->associated) {
1315                 *smps_mode = ifmgd->ap_smps;
1316
1317                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1318                         if (ifmgd->powersave)
1319                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1320                         else
1321                                 *smps_mode = IEEE80211_SMPS_OFF;
1322                 }
1323
1324                 return 1;
1325         }
1326
1327         return 0;
1328 }
1329
1330 /* must hold iflist_mtx */
1331 void ieee80211_recalc_smps(struct ieee80211_local *local)
1332 {
1333         struct ieee80211_sub_if_data *sdata;
1334         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1335         int count = 0;
1336
1337         lockdep_assert_held(&local->iflist_mtx);
1338
1339         /*
1340          * This function could be improved to handle multiple
1341          * interfaces better, but right now it makes any
1342          * non-station interfaces force SM PS to be turned
1343          * off. If there are multiple station interfaces it
1344          * could also use the best possible mode, e.g. if
1345          * one is in static and the other in dynamic then
1346          * dynamic is ok.
1347          */
1348
1349         list_for_each_entry(sdata, &local->interfaces, list) {
1350                 if (!ieee80211_sdata_running(sdata))
1351                         continue;
1352                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1353                         goto set;
1354
1355                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1356
1357                 if (count > 1) {
1358                         smps_mode = IEEE80211_SMPS_OFF;
1359                         break;
1360                 }
1361         }
1362
1363         if (smps_mode == local->smps_mode)
1364                 return;
1365
1366  set:
1367         local->smps_mode = smps_mode;
1368         /* changed flag is auto-detected for this */
1369         ieee80211_hw_config(local, 0);
1370 }
1371
1372 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1373 {
1374         int i;
1375
1376         for (i = 0; i < n_ids; i++)
1377                 if (ids[i] == id)
1378                         return true;
1379         return false;
1380 }
1381
1382 /**
1383  * ieee80211_ie_split - split an IE buffer according to ordering
1384  *
1385  * @ies: the IE buffer
1386  * @ielen: the length of the IE buffer
1387  * @ids: an array with element IDs that are allowed before
1388  *      the split
1389  * @n_ids: the size of the element ID array
1390  * @offset: offset where to start splitting in the buffer
1391  *
1392  * This function splits an IE buffer by updating the @offset
1393  * variable to point to the location where the buffer should be
1394  * split.
1395  *
1396  * It assumes that the given IE buffer is well-formed, this
1397  * has to be guaranteed by the caller!
1398  *
1399  * It also assumes that the IEs in the buffer are ordered
1400  * correctly, if not the result of using this function will not
1401  * be ordered correctly either, i.e. it does no reordering.
1402  *
1403  * The function returns the offset where the next part of the
1404  * buffer starts, which may be @ielen if the entire (remainder)
1405  * of the buffer should be used.
1406  */
1407 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1408                           const u8 *ids, int n_ids, size_t offset)
1409 {
1410         size_t pos = offset;
1411
1412         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1413                 pos += 2 + ies[pos + 1];
1414
1415         return pos;
1416 }
1417
1418 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1419 {
1420         size_t pos = offset;
1421
1422         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1423                 pos += 2 + ies[pos + 1];
1424
1425         return pos;
1426 }