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;
 100         struct ieee80211_hdr *hdr;
 101
 102         skb_queue_walk(&tx->skbs, skb) {
 103                 hdr = (struct ieee80211_hdr *) skb->data;
 104                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 105         }
 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 void 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, 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                 queue = skb_get_queue_mapping(skb);
 394                 __skb_queue_tail(&local->pending[queue], skb);
 395         }
 396
 397         if (fn)
 398                 fn(data);
 399
 400         for (i = 0; i < hw->queues; i++)
 401                 __ieee80211_wake_queue(hw, i,
 402                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 403         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 404 }
 405
 406 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 407                                 struct sk_buff_head *skbs)
 408 {
 409         ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
 410 }
 411
 412 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 413                                     enum queue_stop_reason reason)
 414 {
 415         struct ieee80211_local *local = hw_to_local(hw);
 416         unsigned long flags;
 417         int i;
 418
 419         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 420
 421         for (i = 0; i < hw->queues; i++)
 422                 __ieee80211_stop_queue(hw, i, reason);
 423
 424         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 425 }
 426
 427 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 428 {
 429         ieee80211_stop_queues_by_reason(hw,
 430                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 431 }
 432 EXPORT_SYMBOL(ieee80211_stop_queues);
 433
 434 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 435 {
 436         struct ieee80211_local *local = hw_to_local(hw);
 437         unsigned long flags;
 438         int ret;
 439
 440         if (WARN_ON(queue >= hw->queues))
 441                 return true;
 442
 443         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 444         ret = !!local->queue_stop_reasons[queue];
 445         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 446         return ret;
 447 }
 448 EXPORT_SYMBOL(ieee80211_queue_stopped);
 449
 450 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 451                                      enum queue_stop_reason reason)
 452 {
 453         struct ieee80211_local *local = hw_to_local(hw);
 454         unsigned long flags;
 455         int i;
 456
 457         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 458
 459         for (i = 0; i < hw->queues; i++)
 460                 __ieee80211_wake_queue(hw, i, reason);
 461
 462         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 463 }
 464
 465 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 466 {
 467         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 468 }
 469 EXPORT_SYMBOL(ieee80211_wake_queues);
 470
 471 void ieee80211_iterate_active_interfaces(
 472         struct ieee80211_hw *hw,
 473         void (*iterator)(void *data, u8 *mac,
 474                          struct ieee80211_vif *vif),
 475         void *data)
 476 {
 477         struct ieee80211_local *local = hw_to_local(hw);
 478         struct ieee80211_sub_if_data *sdata;
 479
 480         mutex_lock(&local->iflist_mtx);
 481
 482         list_for_each_entry(sdata, &local->interfaces, list) {
 483                 switch (sdata->vif.type) {
 484                 case NL80211_IFTYPE_MONITOR:
 485                 case NL80211_IFTYPE_AP_VLAN:
 486                         continue;
 487                 default:
 488                         break;
 489                 }
 490                 if (ieee80211_sdata_running(sdata))
 491                         iterator(data, sdata->vif.addr,
 492                                  &sdata->vif);
 493         }
 494
 495         mutex_unlock(&local->iflist_mtx);
 496 }
 497 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 498
 499 void ieee80211_iterate_active_interfaces_atomic(
 500         struct ieee80211_hw *hw,
 501         void (*iterator)(void *data, u8 *mac,
 502                          struct ieee80211_vif *vif),
 503         void *data)
 504 {
 505         struct ieee80211_local *local = hw_to_local(hw);
 506         struct ieee80211_sub_if_data *sdata;
 507
 508         rcu_read_lock();
 509
 510         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 511                 switch (sdata->vif.type) {
 512                 case NL80211_IFTYPE_MONITOR:
 513                 case NL80211_IFTYPE_AP_VLAN:
 514                         continue;
 515                 default:
 516                         break;
 517                 }
 518                 if (ieee80211_sdata_running(sdata))
 519                         iterator(data, sdata->vif.addr,
 520                                  &sdata->vif);
 521         }
 522
 523         rcu_read_unlock();
 524 }
 525 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 526
 527 /*
 528  * Nothing should have been stuffed into the workqueue during
 529  * the suspend->resume cycle. If this WARN is seen then there
 530  * is a bug with either the driver suspend or something in
 531  * mac80211 stuffing into the workqueue which we haven't yet
 532  * cleared during mac80211's suspend cycle.
 533  */
 534 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 535 {
 536         if (WARN(local->suspended && !local->resuming,
 537                  "queueing ieee80211 work while going to suspend\n"))
 538                 return false;
 539
 540         return true;
 541 }
 542
 543 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 544 {
 545         struct ieee80211_local *local = hw_to_local(hw);
 546
 547         if (!ieee80211_can_queue_work(local))
 548                 return;
 549
 550         queue_work(local->workqueue, work);
 551 }
 552 EXPORT_SYMBOL(ieee80211_queue_work);
 553
 554 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 555                                   struct delayed_work *dwork,
 556                                   unsigned long delay)
 557 {
 558         struct ieee80211_local *local = hw_to_local(hw);
 559
 560         if (!ieee80211_can_queue_work(local))
 561                 return;
 562
 563         queue_delayed_work(local->workqueue, dwork, delay);
 564 }
 565 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 566
 567 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 568                                struct ieee802_11_elems *elems,
 569                                u64 filter, u32 crc)
 570 {
 571         size_t left = len;
 572         u8 *pos = start;
 573         bool calc_crc = filter != 0;
 574
 575         memset(elems, 0, sizeof(*elems));
 576         elems->ie_start = start;
 577         elems->total_len = len;
 578
 579         while (left >= 2) {
 580                 u8 id, elen;
 581
 582                 id = *pos++;
 583                 elen = *pos++;
 584                 left -= 2;
 585
 586                 if (elen > left)
 587                         break;
 588
 589                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 590                         crc = crc32_be(crc, pos - 2, elen + 2);
 591
 592                 switch (id) {
 593                 case WLAN_EID_SSID:
 594                         elems->ssid = pos;
 595                         elems->ssid_len = elen;
 596                         break;
 597                 case WLAN_EID_SUPP_RATES:
 598                         elems->supp_rates = pos;
 599                         elems->supp_rates_len = elen;
 600                         break;
 601                 case WLAN_EID_FH_PARAMS:
 602                         elems->fh_params = pos;
 603                         elems->fh_params_len = elen;
 604                         break;
 605                 case WLAN_EID_DS_PARAMS:
 606                         elems->ds_params = pos;
 607                         elems->ds_params_len = elen;
 608                         break;
 609                 case WLAN_EID_CF_PARAMS:
 610                         elems->cf_params = pos;
 611                         elems->cf_params_len = elen;
 612                         break;
 613                 case WLAN_EID_TIM:
 614                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 615                                 elems->tim = (void *)pos;
 616                                 elems->tim_len = elen;
 617                         }
 618                         break;
 619                 case WLAN_EID_IBSS_PARAMS:
 620                         elems->ibss_params = pos;
 621                         elems->ibss_params_len = elen;
 622                         break;
 623                 case WLAN_EID_CHALLENGE:
 624                         elems->challenge = pos;
 625                         elems->challenge_len = elen;
 626                         break;
 627                 case WLAN_EID_VENDOR_SPECIFIC:
 628                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 629                             pos[2] == 0xf2) {
 630                                 /* Microsoft OUI (00:50:F2) */
 631
 632                                 if (calc_crc)
 633                                         crc = crc32_be(crc, pos - 2, elen + 2);
 634
 635                                 if (pos[3] == 1) {
 636                                         /* OUI Type 1 - WPA IE */
 637                                         elems->wpa = pos;
 638                                         elems->wpa_len = elen;
 639                                 } else if (elen >= 5 && pos[3] == 2) {
 640                                         /* OUI Type 2 - WMM IE */
 641                                         if (pos[4] == 0) {
 642                                                 elems->wmm_info = pos;
 643                                                 elems->wmm_info_len = elen;
 644                                         } else if (pos[4] == 1) {
 645                                                 elems->wmm_param = pos;
 646                                                 elems->wmm_param_len = elen;
 647                                         }
 648                                 }
 649                         }
 650                         break;
 651                 case WLAN_EID_RSN:
 652                         elems->rsn = pos;
 653                         elems->rsn_len = elen;
 654                         break;
 655                 case WLAN_EID_ERP_INFO:
 656                         elems->erp_info = pos;
 657                         elems->erp_info_len = elen;
 658                         break;
 659                 case WLAN_EID_EXT_SUPP_RATES:
 660                         elems->ext_supp_rates = pos;
 661                         elems->ext_supp_rates_len = elen;
 662                         break;
 663                 case WLAN_EID_HT_CAPABILITY:
 664                         if (elen >= sizeof(struct ieee80211_ht_cap))
 665                                 elems->ht_cap_elem = (void *)pos;
 666                         break;
 667                 case WLAN_EID_HT_INFORMATION:
 668                         if (elen >= sizeof(struct ieee80211_ht_info))
 669                                 elems->ht_info_elem = (void *)pos;
 670                         break;
 671                 case WLAN_EID_MESH_ID:
 672                         elems->mesh_id = pos;
 673                         elems->mesh_id_len = elen;
 674                         break;
 675                 case WLAN_EID_MESH_CONFIG:
 676                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 677                                 elems->mesh_config = (void *)pos;
 678                         break;
 679                 case WLAN_EID_PEER_MGMT:
 680                         elems->peering = pos;
 681                         elems->peering_len = elen;
 682                         break;
 683                 case WLAN_EID_PREQ:
 684                         elems->preq = pos;
 685                         elems->preq_len = elen;
 686                         break;
 687                 case WLAN_EID_PREP:
 688                         elems->prep = pos;
 689                         elems->prep_len = elen;
 690                         break;
 691                 case WLAN_EID_PERR:
 692                         elems->perr = pos;
 693                         elems->perr_len = elen;
 694                         break;
 695                 case WLAN_EID_RANN:
 696                         if (elen >= sizeof(struct ieee80211_rann_ie))
 697                                 elems->rann = (void *)pos;
 698                         break;
 699                 case WLAN_EID_CHANNEL_SWITCH:
 700                         elems->ch_switch_elem = pos;
 701                         elems->ch_switch_elem_len = elen;
 702                         break;
 703                 case WLAN_EID_QUIET:
 704                         if (!elems->quiet_elem) {
 705                                 elems->quiet_elem = pos;
 706                                 elems->quiet_elem_len = elen;
 707                         }
 708                         elems->num_of_quiet_elem++;
 709                         break;
 710                 case WLAN_EID_COUNTRY:
 711                         elems->country_elem = pos;
 712                         elems->country_elem_len = elen;
 713                         break;
 714                 case WLAN_EID_PWR_CONSTRAINT:
 715                         elems->pwr_constr_elem = pos;
 716                         elems->pwr_constr_elem_len = elen;
 717                         break;
 718                 case WLAN_EID_TIMEOUT_INTERVAL:
 719                         elems->timeout_int = pos;
 720                         elems->timeout_int_len = elen;
 721                         break;
 722                 default:
 723                         break;
 724                 }
 725
 726                 left -= elen;
 727                 pos += elen;
 728         }
 729
 730         return crc;
 731 }
 732
 733 void ieee802_11_parse_elems(u8 *start, size_t len,
 734                             struct ieee802_11_elems *elems)
 735 {
 736         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 737 }
 738
 739 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 740 {
 741         struct ieee80211_local *local = sdata->local;
 742         struct ieee80211_tx_queue_params qparam;
 743         int queue;
 744         bool use_11b;
 745         int aCWmin, aCWmax;
 746
 747         if (!local->ops->conf_tx)
 748                 return;
 749
 750         memset(&qparam, 0, sizeof(qparam));
 751
 752         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 753                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 754
 755         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 756                 /* Set defaults according to 802.11-2007 Table 7-37 */
 757                 aCWmax = 1023;
 758                 if (use_11b)
 759                         aCWmin = 31;
 760                 else
 761                         aCWmin = 15;
 762
 763                 switch (queue) {
 764                 case 3: /* AC_BK */
 765                         qparam.cw_max = aCWmax;
 766                         qparam.cw_min = aCWmin;
 767                         qparam.txop = 0;
 768                         qparam.aifs = 7;
 769                         break;
 770                 default: /* never happens but let's not leave undefined */
 771                 case 2: /* AC_BE */
 772                         qparam.cw_max = aCWmax;
 773                         qparam.cw_min = aCWmin;
 774                         qparam.txop = 0;
 775                         qparam.aifs = 3;
 776                         break;
 777                 case 1: /* AC_VI */
 778                         qparam.cw_max = aCWmin;
 779                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 780                         if (use_11b)
 781                                 qparam.txop = 6016/32;
 782                         else
 783                                 qparam.txop = 3008/32;
 784                         qparam.aifs = 2;
 785                         break;
 786                 case 0: /* AC_VO */
 787                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 788                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 789                         if (use_11b)
 790                                 qparam.txop = 3264/32;
 791                         else
 792                                 qparam.txop = 1504/32;
 793                         qparam.aifs = 2;
 794                         break;
 795                 }
 796
 797                 qparam.uapsd = false;
 798
 799                 sdata->tx_conf[queue] = qparam;
 800                 drv_conf_tx(local, sdata, queue, &qparam);
 801         }
 802
 803         /* after reinitialize QoS TX queues setting to default,
 804          * disable QoS at all */
 805
 806         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 807                 sdata->vif.bss_conf.qos =
 808                         sdata->vif.type != NL80211_IFTYPE_STATION;
 809                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 810         }
 811 }
 812
 813 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 814                                   const size_t supp_rates_len,
 815                                   const u8 *supp_rates)
 816 {
 817         struct ieee80211_local *local = sdata->local;
 818         int i, have_higher_than_11mbit = 0;
 819
 820         /* cf. IEEE 802.11 9.2.12 */
 821         for (i = 0; i < supp_rates_len; i++)
 822                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 823                         have_higher_than_11mbit = 1;
 824
 825         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 826             have_higher_than_11mbit)
 827                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 828         else
 829                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 830
 831         ieee80211_set_wmm_default(sdata);
 832 }
 833
 834 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 835                               enum ieee80211_band band)
 836 {
 837         struct ieee80211_supported_band *sband;
 838         struct ieee80211_rate *bitrates;
 839         u32 mandatory_rates;
 840         enum ieee80211_rate_flags mandatory_flag;
 841         int i;
 842
 843         sband = local->hw.wiphy->bands[band];
 844         if (!sband) {
 845                 WARN_ON(1);
 846                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 847         }
 848
 849         if (band == IEEE80211_BAND_2GHZ)
 850                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 851         else
 852                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 853
 854         bitrates = sband->bitrates;
 855         mandatory_rates = 0;
 856         for (i = 0; i < sband->n_bitrates; i++)
 857                 if (bitrates[i].flags & mandatory_flag)
 858                         mandatory_rates |= BIT(i);
 859         return mandatory_rates;
 860 }
 861
 862 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 863                          u16 transaction, u16 auth_alg,
 864                          u8 *extra, size_t extra_len, const u8 *bssid,
 865                          const u8 *key, u8 key_len, u8 key_idx)
 866 {
 867         struct ieee80211_local *local = sdata->local;
 868         struct sk_buff *skb;
 869         struct ieee80211_mgmt *mgmt;
 870         int err;
 871
 872         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 873                             sizeof(*mgmt) + 6 + extra_len);
 874         if (!skb)
 875                 return;
 876
 877         skb_reserve(skb, local->hw.extra_tx_headroom);
 878
 879         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 880         memset(mgmt, 0, 24 + 6);
 881         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 882                                           IEEE80211_STYPE_AUTH);
 883         memcpy(mgmt->da, bssid, ETH_ALEN);
 884         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 885         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 886         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 887         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 888         mgmt->u.auth.status_code = cpu_to_le16(0);
 889         if (extra)
 890                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 891
 892         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 893                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 894                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 895                 WARN_ON(err);
 896         }
 897
 898         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 899         ieee80211_tx_skb(sdata, skb);
 900 }
 901
 902 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 903                              const u8 *ie, size_t ie_len,
 904                              enum ieee80211_band band, u32 rate_mask,
 905                              u8 channel)
 906 {
 907         struct ieee80211_supported_band *sband;
 908         u8 *pos;
 909         size_t offset = 0, noffset;
 910         int supp_rates_len, i;
 911         u8 rates[32];
 912         int num_rates;
 913         int ext_rates_len;
 914
 915         sband = local->hw.wiphy->bands[band];
 916
 917         pos = buffer;
 918
 919         num_rates = 0;
 920         for (i = 0; i < sband->n_bitrates; i++) {
 921                 if ((BIT(i) & rate_mask) == 0)
 922                         continue; /* skip rate */
 923                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
 924         }
 925
 926         supp_rates_len = min_t(int, num_rates, 8);
 927
 928         *pos++ = WLAN_EID_SUPP_RATES;
 929         *pos++ = supp_rates_len;
 930         memcpy(pos, rates, supp_rates_len);
 931         pos += supp_rates_len;
 932
 933         /* insert "request information" if in custom IEs */
 934         if (ie && ie_len) {
 935                 static const u8 before_extrates[] = {
 936                         WLAN_EID_SSID,
 937                         WLAN_EID_SUPP_RATES,
 938                         WLAN_EID_REQUEST,
 939                 };
 940                 noffset = ieee80211_ie_split(ie, ie_len,
 941                                              before_extrates,
 942                                              ARRAY_SIZE(before_extrates),
 943                                              offset);
 944                 memcpy(pos, ie + offset, noffset - offset);
 945                 pos += noffset - offset;
 946                 offset = noffset;
 947         }
 948
 949         ext_rates_len = num_rates - supp_rates_len;
 950         if (ext_rates_len > 0) {
 951                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 952                 *pos++ = ext_rates_len;
 953                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
 954                 pos += ext_rates_len;
 955         }
 956
 957         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
 958                 *pos++ = WLAN_EID_DS_PARAMS;
 959                 *pos++ = 1;
 960                 *pos++ = channel;
 961         }
 962
 963         /* insert custom IEs that go before HT */
 964         if (ie && ie_len) {
 965                 static const u8 before_ht[] = {
 966                         WLAN_EID_SSID,
 967                         WLAN_EID_SUPP_RATES,
 968                         WLAN_EID_REQUEST,
 969                         WLAN_EID_EXT_SUPP_RATES,
 970                         WLAN_EID_DS_PARAMS,
 971                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 972                 };
 973                 noffset = ieee80211_ie_split(ie, ie_len,
 974                                              before_ht, ARRAY_SIZE(before_ht),
 975                                              offset);
 976                 memcpy(pos, ie + offset, noffset - offset);
 977                 pos += noffset - offset;
 978                 offset = noffset;
 979         }
 980
 981         if (sband->ht_cap.ht_supported)
 982                 pos = ieee80211_ie_build_ht_cap(pos, sband, sband->ht_cap.cap);
 983
 984         /*
 985          * If adding more here, adjust code in main.c
 986          * that calculates local->scan_ies_len.
 987          */
 988
 989         /* add any remaining custom IEs */
 990         if (ie && ie_len) {
 991                 noffset = ie_len;
 992                 memcpy(pos, ie + offset, noffset - offset);
 993                 pos += noffset - offset;
 994         }
 995
 996         return pos - buffer;
 997 }
 998
 999 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1000                                           u8 *dst, u32 ratemask,
1001                                           const u8 *ssid, size_t ssid_len,
1002                                           const u8 *ie, size_t ie_len,
1003                                           bool directed)
1004 {
1005         struct ieee80211_local *local = sdata->local;
1006         struct sk_buff *skb;
1007         struct ieee80211_mgmt *mgmt;
1008         size_t buf_len;
1009         u8 *buf;
1010         u8 chan;
1011
1012         /* FIXME: come up with a proper value */
1013         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1014         if (!buf)
1015                 return NULL;
1016
1017         /*
1018          * Do not send DS Channel parameter for directed probe requests
1019          * in order to maximize the chance that we get a response.  Some
1020          * badly-behaved APs don't respond when this parameter is included.
1021          */
1022         if (directed)
1023                 chan = 0;
1024         else
1025                 chan = ieee80211_frequency_to_channel(
1026                         local->hw.conf.channel->center_freq);
1027
1028         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1029                                            local->hw.conf.channel->band,
1030                                            ratemask, chan);
1031
1032         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1033                                      ssid, ssid_len,
1034                                      buf, buf_len);
1035
1036         if (dst) {
1037                 mgmt = (struct ieee80211_mgmt *) skb->data;
1038                 memcpy(mgmt->da, dst, ETH_ALEN);
1039                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1040         }
1041
1042         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1043         kfree(buf);
1044
1045         return skb;
1046 }
1047
1048 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1049                               const u8 *ssid, size_t ssid_len,
1050                               const u8 *ie, size_t ie_len,
1051                               u32 ratemask, bool directed, bool no_cck)
1052 {
1053         struct sk_buff *skb;
1054
1055         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1056                                         ie, ie_len, directed);
1057         if (skb) {
1058                 if (no_cck)
1059                         IEEE80211_SKB_CB(skb)->flags |=
1060                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1061                 ieee80211_tx_skb(sdata, skb);
1062         }
1063 }
1064
1065 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1066                             struct ieee802_11_elems *elems,
1067                             enum ieee80211_band band)
1068 {
1069         struct ieee80211_supported_band *sband;
1070         struct ieee80211_rate *bitrates;
1071         size_t num_rates;
1072         u32 supp_rates;
1073         int i, j;
1074         sband = local->hw.wiphy->bands[band];
1075
1076         if (!sband) {
1077                 WARN_ON(1);
1078                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1079         }
1080
1081         bitrates = sband->bitrates;
1082         num_rates = sband->n_bitrates;
1083         supp_rates = 0;
1084         for (i = 0; i < elems->supp_rates_len +
1085                      elems->ext_supp_rates_len; i++) {
1086                 u8 rate = 0;
1087                 int own_rate;
1088                 if (i < elems->supp_rates_len)
1089                         rate = elems->supp_rates[i];
1090                 else if (elems->ext_supp_rates)
1091                         rate = elems->ext_supp_rates
1092                                 [i - elems->supp_rates_len];
1093                 own_rate = 5 * (rate & 0x7f);
1094                 for (j = 0; j < num_rates; j++)
1095                         if (bitrates[j].bitrate == own_rate)
1096                                 supp_rates |= BIT(j);
1097         }
1098         return supp_rates;
1099 }
1100
1101 void ieee80211_stop_device(struct ieee80211_local *local)
1102 {
1103         ieee80211_led_radio(local, false);
1104         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1105
1106         cancel_work_sync(&local->reconfig_filter);
1107
1108         flush_workqueue(local->workqueue);
1109         drv_stop(local);
1110 }
1111
1112 int ieee80211_reconfig(struct ieee80211_local *local)
1113 {
1114         struct ieee80211_hw *hw = &local->hw;
1115         struct ieee80211_sub_if_data *sdata;
1116         struct sta_info *sta;
1117         int res, i;
1118
1119 #ifdef CONFIG_PM
1120         if (local->suspended)
1121                 local->resuming = true;
1122
1123         if (local->wowlan) {
1124                 local->wowlan = false;
1125                 res = drv_resume(local);
1126                 if (res < 0) {
1127                         local->resuming = false;
1128                         return res;
1129                 }
1130                 if (res == 0)
1131                         goto wake_up;
1132                 WARN_ON(res > 1);
1133                 /*
1134                  * res is 1, which means the driver requested
1135                  * to go through a regular reset on wakeup.
1136                  */
1137         }
1138 #endif
1139
1140         /* setup fragmentation threshold */
1141         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1142
1143         /* setup RTS threshold */
1144         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1145
1146         /* reset coverage class */
1147         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1148
1149         /* everything else happens only if HW was up & running */
1150         if (!local->open_count)
1151                 goto wake_up;
1152
1153         /*
1154          * Upon resume hardware can sometimes be goofy due to
1155          * various platform / driver / bus issues, so restarting
1156          * the device may at times not work immediately. Propagate
1157          * the error.
1158          */
1159         res = drv_start(local);
1160         if (res) {
1161                 WARN(local->suspended, "Hardware became unavailable "
1162                      "upon resume. This could be a software issue "
1163                      "prior to suspend or a hardware issue.\n");
1164                 return res;
1165         }
1166
1167         ieee80211_led_radio(local, true);
1168         ieee80211_mod_tpt_led_trig(local,
1169                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1170
1171         /* add interfaces */
1172         list_for_each_entry(sdata, &local->interfaces, list) {
1173                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1174                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1175                     ieee80211_sdata_running(sdata))
1176                         res = drv_add_interface(local, sdata);
1177         }
1178
1179         /* add STAs back */
1180         mutex_lock(&local->sta_mtx);
1181         list_for_each_entry(sta, &local->sta_list, list) {
1182                 if (sta->uploaded) {
1183                         sdata = sta->sdata;
1184                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1185                                 sdata = container_of(sdata->bss,
1186                                              struct ieee80211_sub_if_data,
1187                                              u.ap);
1188
1189                         memset(&sta->sta.drv_priv, 0, hw->sta_data_size);
1190                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1191                 }
1192         }
1193         mutex_unlock(&local->sta_mtx);
1194
1195         /* reconfigure tx conf */
1196         list_for_each_entry(sdata, &local->interfaces, list) {
1197                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1198                     sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1199                     !ieee80211_sdata_running(sdata))
1200                         continue;
1201
1202                 for (i = 0; i < hw->queues; i++)
1203                         drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1204         }
1205
1206         /* reconfigure hardware */
1207         ieee80211_hw_config(local, ~0);
1208
1209         ieee80211_configure_filter(local);
1210
1211         /* Finally also reconfigure all the BSS information */
1212         list_for_each_entry(sdata, &local->interfaces, list) {
1213                 u32 changed;
1214
1215                 if (!ieee80211_sdata_running(sdata))
1216                         continue;
1217
1218                 /* common change flags for all interface types */
1219                 changed = BSS_CHANGED_ERP_CTS_PROT |
1220                           BSS_CHANGED_ERP_PREAMBLE |
1221                           BSS_CHANGED_ERP_SLOT |
1222                           BSS_CHANGED_HT |
1223                           BSS_CHANGED_BASIC_RATES |
1224                           BSS_CHANGED_BEACON_INT |
1225                           BSS_CHANGED_BSSID |
1226                           BSS_CHANGED_CQM |
1227                           BSS_CHANGED_QOS |
1228                           BSS_CHANGED_IDLE;
1229
1230                 switch (sdata->vif.type) {
1231                 case NL80211_IFTYPE_STATION:
1232                         changed |= BSS_CHANGED_ASSOC;
1233                         mutex_lock(&sdata->u.mgd.mtx);
1234                         ieee80211_bss_info_change_notify(sdata, changed);
1235                         mutex_unlock(&sdata->u.mgd.mtx);
1236                         break;
1237                 case NL80211_IFTYPE_ADHOC:
1238                         changed |= BSS_CHANGED_IBSS;
1239                         /* fall through */
1240                 case NL80211_IFTYPE_AP:
1241                         changed |= BSS_CHANGED_SSID |
1242                                    BSS_CHANGED_AP_PROBE_RESP;
1243                         /* fall through */
1244                 case NL80211_IFTYPE_MESH_POINT:
1245                         changed |= BSS_CHANGED_BEACON |
1246                                    BSS_CHANGED_BEACON_ENABLED;
1247                         ieee80211_bss_info_change_notify(sdata, changed);
1248                         break;
1249                 case NL80211_IFTYPE_WDS:
1250                         break;
1251                 case NL80211_IFTYPE_AP_VLAN:
1252                 case NL80211_IFTYPE_MONITOR:
1253                         /* ignore virtual */
1254                         break;
1255                 case NL80211_IFTYPE_UNSPECIFIED:
1256                 case NUM_NL80211_IFTYPES:
1257                 case NL80211_IFTYPE_P2P_CLIENT:
1258                 case NL80211_IFTYPE_P2P_GO:
1259                         WARN_ON(1);
1260                         break;
1261                 }
1262         }
1263
1264         ieee80211_recalc_ps(local, -1);
1265
1266         /*
1267          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1268          * sessions can be established after a resume.
1269          *
1270          * Also tear down aggregation sessions since reconfiguring
1271          * them in a hardware restart scenario is not easily done
1272          * right now, and the hardware will have lost information
1273          * about the sessions, but we and the AP still think they
1274          * are active. This is really a workaround though.
1275          */
1276         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1277                 mutex_lock(&local->sta_mtx);
1278
1279                 list_for_each_entry(sta, &local->sta_list, list) {
1280                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1281                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1282                 }
1283
1284                 mutex_unlock(&local->sta_mtx);
1285         }
1286
1287         /* add back keys */
1288         list_for_each_entry(sdata, &local->interfaces, list)
1289                 if (ieee80211_sdata_running(sdata))
1290                         ieee80211_enable_keys(sdata);
1291
1292  wake_up:
1293         ieee80211_wake_queues_by_reason(hw,
1294                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1295
1296         /*
1297          * If this is for hw restart things are still running.
1298          * We may want to change that later, however.
1299          */
1300         if (!local->suspended)
1301                 return 0;
1302
1303 #ifdef CONFIG_PM
1304         /* first set suspended false, then resuming */
1305         local->suspended = false;
1306         mb();
1307         local->resuming = false;
1308
1309         list_for_each_entry(sdata, &local->interfaces, list) {
1310                 switch(sdata->vif.type) {
1311                 case NL80211_IFTYPE_STATION:
1312                         ieee80211_sta_restart(sdata);
1313                         break;
1314                 case NL80211_IFTYPE_ADHOC:
1315                         ieee80211_ibss_restart(sdata);
1316                         break;
1317                 case NL80211_IFTYPE_MESH_POINT:
1318                         ieee80211_mesh_restart(sdata);
1319                         break;
1320                 default:
1321                         break;
1322                 }
1323         }
1324
1325         mod_timer(&local->sta_cleanup, jiffies + 1);
1326
1327         mutex_lock(&local->sta_mtx);
1328         list_for_each_entry(sta, &local->sta_list, list)
1329                 mesh_plink_restart(sta);
1330         mutex_unlock(&local->sta_mtx);
1331 #else
1332         WARN_ON(1);
1333 #endif
1334         return 0;
1335 }
1336
1337 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1338 {
1339         struct ieee80211_sub_if_data *sdata;
1340         struct ieee80211_local *local;
1341         struct ieee80211_key *key;
1342
1343         if (WARN_ON(!vif))
1344                 return;
1345
1346         sdata = vif_to_sdata(vif);
1347         local = sdata->local;
1348
1349         if (WARN_ON(!local->resuming))
1350                 return;
1351
1352         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1353                 return;
1354
1355         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1356
1357         mutex_lock(&local->key_mtx);
1358         list_for_each_entry(key, &sdata->key_list, list)
1359                 key->flags |= KEY_FLAG_TAINTED;
1360         mutex_unlock(&local->key_mtx);
1361 }
1362 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1363
1364 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1365                           enum ieee80211_smps_mode *smps_mode)
1366 {
1367         if (ifmgd->associated) {
1368                 *smps_mode = ifmgd->ap_smps;
1369
1370                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1371                         if (ifmgd->powersave)
1372                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1373                         else
1374                                 *smps_mode = IEEE80211_SMPS_OFF;
1375                 }
1376
1377                 return 1;
1378         }
1379
1380         return 0;
1381 }
1382
1383 /* must hold iflist_mtx */
1384 void ieee80211_recalc_smps(struct ieee80211_local *local)
1385 {
1386         struct ieee80211_sub_if_data *sdata;
1387         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1388         int count = 0;
1389
1390         lockdep_assert_held(&local->iflist_mtx);
1391
1392         /*
1393          * This function could be improved to handle multiple
1394          * interfaces better, but right now it makes any
1395          * non-station interfaces force SM PS to be turned
1396          * off. If there are multiple station interfaces it
1397          * could also use the best possible mode, e.g. if
1398          * one is in static and the other in dynamic then
1399          * dynamic is ok.
1400          */
1401
1402         list_for_each_entry(sdata, &local->interfaces, list) {
1403                 if (!ieee80211_sdata_running(sdata))
1404                         continue;
1405                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1406                         goto set;
1407
1408                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1409
1410                 if (count > 1) {
1411                         smps_mode = IEEE80211_SMPS_OFF;
1412                         break;
1413                 }
1414         }
1415
1416         if (smps_mode == local->smps_mode)
1417                 return;
1418
1419  set:
1420         local->smps_mode = smps_mode;
1421         /* changed flag is auto-detected for this */
1422         ieee80211_hw_config(local, 0);
1423 }
1424
1425 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1426 {
1427         int i;
1428
1429         for (i = 0; i < n_ids; i++)
1430                 if (ids[i] == id)
1431                         return true;
1432         return false;
1433 }
1434
1435 /**
1436  * ieee80211_ie_split - split an IE buffer according to ordering
1437  *
1438  * @ies: the IE buffer
1439  * @ielen: the length of the IE buffer
1440  * @ids: an array with element IDs that are allowed before
1441  *      the split
1442  * @n_ids: the size of the element ID array
1443  * @offset: offset where to start splitting in the buffer
1444  *
1445  * This function splits an IE buffer by updating the @offset
1446  * variable to point to the location where the buffer should be
1447  * split.
1448  *
1449  * It assumes that the given IE buffer is well-formed, this
1450  * has to be guaranteed by the caller!
1451  *
1452  * It also assumes that the IEs in the buffer are ordered
1453  * correctly, if not the result of using this function will not
1454  * be ordered correctly either, i.e. it does no reordering.
1455  *
1456  * The function returns the offset where the next part of the
1457  * buffer starts, which may be @ielen if the entire (remainder)
1458  * of the buffer should be used.
1459  */
1460 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1461                           const u8 *ids, int n_ids, size_t offset)
1462 {
1463         size_t pos = offset;
1464
1465         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1466                 pos += 2 + ies[pos + 1];
1467
1468         return pos;
1469 }
1470
1471 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1472 {
1473         size_t pos = offset;
1474
1475         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1476                 pos += 2 + ies[pos + 1];
1477
1478         return pos;
1479 }
1480
1481 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1482                                             int rssi_min_thold,
1483                                             int rssi_max_thold)
1484 {
1485         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1486
1487         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1488                 return;
1489
1490         /*
1491          * Scale up threshold values before storing it, as the RSSI averaging
1492          * algorithm uses a scaled up value as well. Change this scaling
1493          * factor if the RSSI averaging algorithm changes.
1494          */
1495         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1496         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1497 }
1498
1499 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1500                                     int rssi_min_thold,
1501                                     int rssi_max_thold)
1502 {
1503         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1504
1505         WARN_ON(rssi_min_thold == rssi_max_thold ||
1506                 rssi_min_thold > rssi_max_thold);
1507
1508         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1509                                        rssi_max_thold);
1510 }
1511 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1512
1513 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1514 {
1515         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1516
1517         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1518 }
1519 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1520
1521 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_supported_band *sband,
1522                               u16 cap)
1523 {
1524         __le16 tmp;
1525
1526         *pos++ = WLAN_EID_HT_CAPABILITY;
1527         *pos++ = sizeof(struct ieee80211_ht_cap);
1528         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1529
1530         /* capability flags */
1531         tmp = cpu_to_le16(cap);
1532         memcpy(pos, &tmp, sizeof(u16));
1533         pos += sizeof(u16);
1534
1535         /* AMPDU parameters */
1536         *pos++ = sband->ht_cap.ampdu_factor |
1537                  (sband->ht_cap.ampdu_density <<
1538                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1539
1540         /* MCS set */
1541         memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
1542         pos += sizeof(sband->ht_cap.mcs);
1543
1544         /* extended capabilities */
1545         pos += sizeof(__le16);
1546
1547         /* BF capabilities */
1548         pos += sizeof(__le32);
1549
1550         /* antenna selection */
1551         pos += sizeof(u8);
1552
1553         return pos;
1554 }
1555
1556 u8 *ieee80211_ie_build_ht_info(u8 *pos,
1557                                struct ieee80211_sta_ht_cap *ht_cap,
1558                                struct ieee80211_channel *channel,
1559                                enum nl80211_channel_type channel_type)
1560 {
1561         struct ieee80211_ht_info *ht_info;
1562         /* Build HT Information */
1563         *pos++ = WLAN_EID_HT_INFORMATION;
1564         *pos++ = sizeof(struct ieee80211_ht_info);
1565         ht_info = (struct ieee80211_ht_info *)pos;
1566         ht_info->control_chan =
1567                         ieee80211_frequency_to_channel(channel->center_freq);
1568         switch (channel_type) {
1569         case NL80211_CHAN_HT40MINUS:
1570                 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1571                 break;
1572         case NL80211_CHAN_HT40PLUS:
1573                 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1574                 break;
1575         case NL80211_CHAN_HT20:
1576         default:
1577                 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1578                 break;
1579         }
1580         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
1581                 ht_info->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1582         ht_info->operation_mode = 0x0000;
1583         ht_info->stbc_param = 0x0000;
1584
1585         /* It seems that Basic MCS set and Supported MCS set
1586            are identical for the first 10 bytes */
1587         memset(&ht_info->basic_set, 0, 16);
1588         memcpy(&ht_info->basic_set, &ht_cap->mcs, 10);
1589
1590         return pos + sizeof(struct ieee80211_ht_info);
1591 }
1592
1593 enum nl80211_channel_type
1594 ieee80211_ht_info_to_channel_type(struct ieee80211_ht_info *ht_info)
1595 {
1596         enum nl80211_channel_type channel_type;
1597
1598         if (!ht_info)
1599                 return NL80211_CHAN_NO_HT;
1600
1601         switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1602         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1603                 channel_type = NL80211_CHAN_HT20;
1604                 break;
1605         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1606                 channel_type = NL80211_CHAN_HT40PLUS;
1607                 break;
1608         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1609                 channel_type = NL80211_CHAN_HT40MINUS;
1610                 break;
1611         default:
1612                 channel_type = NL80211_CHAN_NO_HT;
1613         }
1614
1615         return channel_type;
1616 }
1617
1618 int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1619 {
1620         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1621         struct ieee80211_local *local = sdata->local;
1622         struct ieee80211_supported_band *sband;
1623         int rate;
1624         u8 i, rates, *pos;
1625
1626         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1627         rates = sband->n_bitrates;
1628         if (rates > 8)
1629                 rates = 8;
1630
1631         if (skb_tailroom(skb) < rates + 2)
1632                 return -ENOMEM;
1633
1634         pos = skb_put(skb, rates + 2);
1635         *pos++ = WLAN_EID_SUPP_RATES;
1636         *pos++ = rates;
1637         for (i = 0; i < rates; i++) {
1638                 rate = sband->bitrates[i].bitrate;
1639                 *pos++ = (u8) (rate / 5);
1640         }
1641
1642         return 0;
1643 }
1644
1645 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1646 {
1647         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1648         struct ieee80211_local *local = sdata->local;
1649         struct ieee80211_supported_band *sband;
1650         int rate;
1651         u8 i, exrates, *pos;
1652
1653         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1654         exrates = sband->n_bitrates;
1655         if (exrates > 8)
1656                 exrates -= 8;
1657         else
1658                 exrates = 0;
1659
1660         if (skb_tailroom(skb) < exrates + 2)
1661                 return -ENOMEM;
1662
1663         if (exrates) {
1664                 pos = skb_put(skb, exrates + 2);
1665                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1666                 *pos++ = exrates;
1667                 for (i = 8; i < sband->n_bitrates; i++) {
1668                         rate = sband->bitrates[i].bitrate;
1669                         *pos++ = (u8) (rate / 5);
1670                 }
1671         }
1672         return 0;
1673 }