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/export.h>
  17 #include <linux/types.h>
  18 #include <linux/slab.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/crc32.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/rtnetlink.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wme.h"
  33 #include "led.h"
  34 #include "wep.h"
  35
  36 /* privid for wiphys to determine whether they belong to us or not */
  37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  38
  39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  40 {
  41         struct ieee80211_local *local;
  42         BUG_ON(!wiphy);
  43
  44         local = wiphy_priv(wiphy);
  45         return &local->hw;
  46 }
  47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  48
  49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  50                         enum nl80211_iftype type)
  51 {
  52         __le16 fc = hdr->frame_control;
  53
  54          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  55         if (len < 16)
  56                 return NULL;
  57
  58         if (ieee80211_is_data(fc)) {
  59                 if (len < 24) /* drop incorrect hdr len (data) */
  60                         return NULL;
  61
  62                 if (ieee80211_has_a4(fc))
  63                         return NULL;
  64                 if (ieee80211_has_tods(fc))
  65                         return hdr->addr1;
  66                 if (ieee80211_has_fromds(fc))
  67                         return hdr->addr2;
  68
  69                 return hdr->addr3;
  70         }
  71
  72         if (ieee80211_is_mgmt(fc)) {
  73                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  74                         return NULL;
  75                 return hdr->addr3;
  76         }
  77
  78         if (ieee80211_is_ctl(fc)) {
  79                 if(ieee80211_is_pspoll(fc))
  80                         return hdr->addr1;
  81
  82                 if (ieee80211_is_back_req(fc)) {
  83                         switch (type) {
  84                         case NL80211_IFTYPE_STATION:
  85                                 return hdr->addr2;
  86                         case NL80211_IFTYPE_AP:
  87                         case NL80211_IFTYPE_AP_VLAN:
  88                                 return hdr->addr1;
  89                         default:
  90                                 break; /* fall through to the return */
  91                         }
  92                 }
  93         }
  94
  95         return NULL;
  96 }
  97
  98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  99 {
 100         struct sk_buff *skb;
 101         struct ieee80211_hdr *hdr;
 102
 103         skb_queue_walk(&tx->skbs, skb) {
 104                 hdr = (struct ieee80211_hdr *) skb->data;
 105                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 106         }
 107 }
 108
 109 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 110                              int rate, int erp, int short_preamble)
 111 {
 112         int dur;
 113
 114         /* calculate duration (in microseconds, rounded up to next higher
 115          * integer if it includes a fractional microsecond) to send frame of
 116          * len bytes (does not include FCS) at the given rate. Duration will
 117          * also include SIFS.
 118          *
 119          * rate is in 100 kbps, so divident is multiplied by 10 in the
 120          * DIV_ROUND_UP() operations.
 121          */
 122
 123         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 124                 /*
 125                  * OFDM:
 126                  *
 127                  * N_DBPS = DATARATE x 4
 128                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 129                  *      (16 = SIGNAL time, 6 = tail bits)
 130                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 131                  *
 132                  * T_SYM = 4 usec
 133                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 134                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 135                  *      signal ext = 6 usec
 136                  */
 137                 dur = 16; /* SIFS + signal ext */
 138                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 139                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 140                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 141                                         4 * rate); /* T_SYM x N_SYM */
 142         } else {
 143                 /*
 144                  * 802.11b or 802.11g with 802.11b compatibility:
 145                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 146                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 147                  *
 148                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 149                  * aSIFSTime = 10 usec
 150                  * aPreambleLength = 144 usec or 72 usec with short preamble
 151                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 152                  */
 153                 dur = 10; /* aSIFSTime = 10 usec */
 154                 dur += short_preamble ? (72 + 24) : (144 + 48);
 155
 156                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 157         }
 158
 159         return dur;
 160 }
 161
 162 /* Exported duration function for driver use */
 163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 164                                         struct ieee80211_vif *vif,
 165                                         size_t frame_len,
 166                                         struct ieee80211_rate *rate)
 167 {
 168         struct ieee80211_local *local = hw_to_local(hw);
 169         struct ieee80211_sub_if_data *sdata;
 170         u16 dur;
 171         int erp;
 172         bool short_preamble = false;
 173
 174         erp = 0;
 175         if (vif) {
 176                 sdata = vif_to_sdata(vif);
 177                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 178                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 179                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 180         }
 181
 182         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 183                                        short_preamble);
 184
 185         return cpu_to_le16(dur);
 186 }
 187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 188
 189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 190                               struct ieee80211_vif *vif, size_t frame_len,
 191                               const struct ieee80211_tx_info *frame_txctl)
 192 {
 193         struct ieee80211_local *local = hw_to_local(hw);
 194         struct ieee80211_rate *rate;
 195         struct ieee80211_sub_if_data *sdata;
 196         bool short_preamble;
 197         int erp;
 198         u16 dur;
 199         struct ieee80211_supported_band *sband;
 200
 201         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 202
 203         short_preamble = false;
 204
 205         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 206
 207         erp = 0;
 208         if (vif) {
 209                 sdata = vif_to_sdata(vif);
 210                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 211                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 212                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 213         }
 214
 215         /* CTS duration */
 216         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 217                                        erp, short_preamble);
 218         /* Data frame duration */
 219         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 220                                         erp, short_preamble);
 221         /* ACK duration */
 222         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 223                                         erp, short_preamble);
 224
 225         return cpu_to_le16(dur);
 226 }
 227 EXPORT_SYMBOL(ieee80211_rts_duration);
 228
 229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 230                                     struct ieee80211_vif *vif,
 231                                     size_t frame_len,
 232                                     const struct ieee80211_tx_info *frame_txctl)
 233 {
 234         struct ieee80211_local *local = hw_to_local(hw);
 235         struct ieee80211_rate *rate;
 236         struct ieee80211_sub_if_data *sdata;
 237         bool short_preamble;
 238         int erp;
 239         u16 dur;
 240         struct ieee80211_supported_band *sband;
 241
 242         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 243
 244         short_preamble = false;
 245
 246         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 247         erp = 0;
 248         if (vif) {
 249                 sdata = vif_to_sdata(vif);
 250                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 251                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 252                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 253         }
 254
 255         /* Data frame duration */
 256         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 257                                        erp, short_preamble);
 258         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 259                 /* ACK duration */
 260                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 261                                                 erp, short_preamble);
 262         }
 263
 264         return cpu_to_le16(dur);
 265 }
 266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 269                                    enum queue_stop_reason reason)
 270 {
 271         struct ieee80211_local *local = hw_to_local(hw);
 272         struct ieee80211_sub_if_data *sdata;
 273
 274         trace_wake_queue(local, queue, reason);
 275
 276         if (WARN_ON(queue >= hw->queues))
 277                 return;
 278
 279         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 280
 281         if (local->queue_stop_reasons[queue] != 0)
 282                 /* someone still has this queue stopped */
 283                 return;
 284
 285         if (skb_queue_empty(&local->pending[queue])) {
 286                 rcu_read_lock();
 287                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 288                         if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 289                                 continue;
 290                         netif_wake_subqueue(sdata->dev, queue);
 291                 }
 292                 rcu_read_unlock();
 293         } else
 294                 tasklet_schedule(&local->tx_pending_tasklet);
 295 }
 296
 297 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 298                                     enum queue_stop_reason reason)
 299 {
 300         struct ieee80211_local *local = hw_to_local(hw);
 301         unsigned long flags;
 302
 303         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 304         __ieee80211_wake_queue(hw, queue, reason);
 305         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 306 }
 307
 308 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 309 {
 310         ieee80211_wake_queue_by_reason(hw, queue,
 311                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 312 }
 313 EXPORT_SYMBOL(ieee80211_wake_queue);
 314
 315 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 316                                    enum queue_stop_reason reason)
 317 {
 318         struct ieee80211_local *local = hw_to_local(hw);
 319         struct ieee80211_sub_if_data *sdata;
 320
 321         trace_stop_queue(local, queue, reason);
 322
 323         if (WARN_ON(queue >= hw->queues))
 324                 return;
 325
 326         __set_bit(reason, &local->queue_stop_reasons[queue]);
 327
 328         rcu_read_lock();
 329         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 330                 netif_stop_subqueue(sdata->dev, queue);
 331         rcu_read_unlock();
 332 }
 333
 334 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 335                                     enum queue_stop_reason reason)
 336 {
 337         struct ieee80211_local *local = hw_to_local(hw);
 338         unsigned long flags;
 339
 340         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 341         __ieee80211_stop_queue(hw, queue, reason);
 342         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 343 }
 344
 345 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 346 {
 347         ieee80211_stop_queue_by_reason(hw, queue,
 348                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 349 }
 350 EXPORT_SYMBOL(ieee80211_stop_queue);
 351
 352 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 353                                struct sk_buff *skb)
 354 {
 355         struct ieee80211_hw *hw = &local->hw;
 356         unsigned long flags;
 357         int queue = skb_get_queue_mapping(skb);
 358         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 359
 360         if (WARN_ON(!info->control.vif)) {
 361                 kfree_skb(skb);
 362                 return;
 363         }
 364
 365         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 366         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 367         __skb_queue_tail(&local->pending[queue], skb);
 368         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 369         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 370 }
 371
 372 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 373                                    struct sk_buff_head *skbs,
 374                                    void (*fn)(void *data), void *data)
 375 {
 376         struct ieee80211_hw *hw = &local->hw;
 377         struct sk_buff *skb;
 378         unsigned long flags;
 379         int queue, i;
 380
 381         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 382         for (i = 0; i < hw->queues; i++)
 383                 __ieee80211_stop_queue(hw, i,
 384                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 385
 386         while ((skb = skb_dequeue(skbs))) {
 387                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 388
 389                 if (WARN_ON(!info->control.vif)) {
 390                         kfree_skb(skb);
 391                         continue;
 392                 }
 393
 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
 407 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 408                                 struct sk_buff_head *skbs)
 409 {
 410         ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
 411 }
 412
 413 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 414                                     enum queue_stop_reason reason)
 415 {
 416         struct ieee80211_local *local = hw_to_local(hw);
 417         unsigned long flags;
 418         int i;
 419
 420         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 421
 422         for (i = 0; i < hw->queues; i++)
 423                 __ieee80211_stop_queue(hw, i, reason);
 424
 425         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 426 }
 427
 428 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 429 {
 430         ieee80211_stop_queues_by_reason(hw,
 431                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 432 }
 433 EXPORT_SYMBOL(ieee80211_stop_queues);
 434
 435 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 436 {
 437         struct ieee80211_local *local = hw_to_local(hw);
 438         unsigned long flags;
 439         int ret;
 440
 441         if (WARN_ON(queue >= hw->queues))
 442                 return true;
 443
 444         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 445         ret = !!local->queue_stop_reasons[queue];
 446         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 447         return ret;
 448 }
 449 EXPORT_SYMBOL(ieee80211_queue_stopped);
 450
 451 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 452                                      enum queue_stop_reason reason)
 453 {
 454         struct ieee80211_local *local = hw_to_local(hw);
 455         unsigned long flags;
 456         int i;
 457
 458         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 459
 460         for (i = 0; i < hw->queues; i++)
 461                 __ieee80211_wake_queue(hw, i, reason);
 462
 463         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 464 }
 465
 466 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 467 {
 468         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 469 }
 470 EXPORT_SYMBOL(ieee80211_wake_queues);
 471
 472 void ieee80211_iterate_active_interfaces(
 473         struct ieee80211_hw *hw,
 474         void (*iterator)(void *data, u8 *mac,
 475                          struct ieee80211_vif *vif),
 476         void *data)
 477 {
 478         struct ieee80211_local *local = hw_to_local(hw);
 479         struct ieee80211_sub_if_data *sdata;
 480
 481         mutex_lock(&local->iflist_mtx);
 482
 483         list_for_each_entry(sdata, &local->interfaces, list) {
 484                 switch (sdata->vif.type) {
 485                 case NL80211_IFTYPE_MONITOR:
 486                 case NL80211_IFTYPE_AP_VLAN:
 487                         continue;
 488                 default:
 489                         break;
 490                 }
 491                 if (ieee80211_sdata_running(sdata))
 492                         iterator(data, sdata->vif.addr,
 493                                  &sdata->vif);
 494         }
 495
 496         mutex_unlock(&local->iflist_mtx);
 497 }
 498 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 499
 500 void ieee80211_iterate_active_interfaces_atomic(
 501         struct ieee80211_hw *hw,
 502         void (*iterator)(void *data, u8 *mac,
 503                          struct ieee80211_vif *vif),
 504         void *data)
 505 {
 506         struct ieee80211_local *local = hw_to_local(hw);
 507         struct ieee80211_sub_if_data *sdata;
 508
 509         rcu_read_lock();
 510
 511         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 512                 switch (sdata->vif.type) {
 513                 case NL80211_IFTYPE_MONITOR:
 514                 case NL80211_IFTYPE_AP_VLAN:
 515                         continue;
 516                 default:
 517                         break;
 518                 }
 519                 if (ieee80211_sdata_running(sdata))
 520                         iterator(data, sdata->vif.addr,
 521                                  &sdata->vif);
 522         }
 523
 524         rcu_read_unlock();
 525 }
 526 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 527
 528 /*
 529  * Nothing should have been stuffed into the workqueue during
 530  * the suspend->resume cycle. If this WARN is seen then there
 531  * is a bug with either the driver suspend or something in
 532  * mac80211 stuffing into the workqueue which we haven't yet
 533  * cleared during mac80211's suspend cycle.
 534  */
 535 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 536 {
 537         if (WARN(local->suspended && !local->resuming,
 538                  "queueing ieee80211 work while going to suspend\n"))
 539                 return false;
 540
 541         return true;
 542 }
 543
 544 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 545 {
 546         struct ieee80211_local *local = hw_to_local(hw);
 547
 548         if (!ieee80211_can_queue_work(local))
 549                 return;
 550
 551         queue_work(local->workqueue, work);
 552 }
 553 EXPORT_SYMBOL(ieee80211_queue_work);
 554
 555 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 556                                   struct delayed_work *dwork,
 557                                   unsigned long delay)
 558 {
 559         struct ieee80211_local *local = hw_to_local(hw);
 560
 561         if (!ieee80211_can_queue_work(local))
 562                 return;
 563
 564         queue_delayed_work(local->workqueue, dwork, delay);
 565 }
 566 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 567
 568 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 569                                struct ieee802_11_elems *elems,
 570                                u64 filter, u32 crc)
 571 {
 572         size_t left = len;
 573         u8 *pos = start;
 574         bool calc_crc = filter != 0;
 575
 576         memset(elems, 0, sizeof(*elems));
 577         elems->ie_start = start;
 578         elems->total_len = len;
 579
 580         while (left >= 2) {
 581                 u8 id, elen;
 582
 583                 id = *pos++;
 584                 elen = *pos++;
 585                 left -= 2;
 586
 587                 if (elen > left)
 588                         break;
 589
 590                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 591                         crc = crc32_be(crc, pos - 2, elen + 2);
 592
 593                 switch (id) {
 594                 case WLAN_EID_SSID:
 595                         elems->ssid = pos;
 596                         elems->ssid_len = elen;
 597                         break;
 598                 case WLAN_EID_SUPP_RATES:
 599                         elems->supp_rates = pos;
 600                         elems->supp_rates_len = elen;
 601                         break;
 602                 case WLAN_EID_FH_PARAMS:
 603                         elems->fh_params = pos;
 604                         elems->fh_params_len = elen;
 605                         break;
 606                 case WLAN_EID_DS_PARAMS:
 607                         elems->ds_params = pos;
 608                         elems->ds_params_len = elen;
 609                         break;
 610                 case WLAN_EID_CF_PARAMS:
 611                         elems->cf_params = pos;
 612                         elems->cf_params_len = elen;
 613                         break;
 614                 case WLAN_EID_TIM:
 615                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 616                                 elems->tim = (void *)pos;
 617                                 elems->tim_len = elen;
 618                         }
 619                         break;
 620                 case WLAN_EID_IBSS_PARAMS:
 621                         elems->ibss_params = pos;
 622                         elems->ibss_params_len = elen;
 623                         break;
 624                 case WLAN_EID_CHALLENGE:
 625                         elems->challenge = pos;
 626                         elems->challenge_len = elen;
 627                         break;
 628                 case WLAN_EID_VENDOR_SPECIFIC:
 629                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 630                             pos[2] == 0xf2) {
 631                                 /* Microsoft OUI (00:50:F2) */
 632
 633                                 if (calc_crc)
 634                                         crc = crc32_be(crc, pos - 2, elen + 2);
 635
 636                                 if (pos[3] == 1) {
 637                                         /* OUI Type 1 - WPA IE */
 638                                         elems->wpa = pos;
 639                                         elems->wpa_len = elen;
 640                                 } else if (elen >= 5 && pos[3] == 2) {
 641                                         /* OUI Type 2 - WMM IE */
 642                                         if (pos[4] == 0) {
 643                                                 elems->wmm_info = pos;
 644                                                 elems->wmm_info_len = elen;
 645                                         } else if (pos[4] == 1) {
 646                                                 elems->wmm_param = pos;
 647                                                 elems->wmm_param_len = elen;
 648                                         }
 649                                 }
 650                         }
 651                         break;
 652                 case WLAN_EID_RSN:
 653                         elems->rsn = pos;
 654                         elems->rsn_len = elen;
 655                         break;
 656                 case WLAN_EID_ERP_INFO:
 657                         elems->erp_info = pos;
 658                         elems->erp_info_len = elen;
 659                         break;
 660                 case WLAN_EID_EXT_SUPP_RATES:
 661                         elems->ext_supp_rates = pos;
 662                         elems->ext_supp_rates_len = elen;
 663                         break;
 664                 case WLAN_EID_HT_CAPABILITY:
 665                         if (elen >= sizeof(struct ieee80211_ht_cap))
 666                                 elems->ht_cap_elem = (void *)pos;
 667                         break;
 668                 case WLAN_EID_HT_INFORMATION:
 669                         if (elen >= sizeof(struct ieee80211_ht_info))
 670                                 elems->ht_info_elem = (void *)pos;
 671                         break;
 672                 case WLAN_EID_MESH_ID:
 673                         elems->mesh_id = pos;
 674                         elems->mesh_id_len = elen;
 675                         break;
 676                 case WLAN_EID_MESH_CONFIG:
 677                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 678                                 elems->mesh_config = (void *)pos;
 679                         break;
 680                 case WLAN_EID_PEER_MGMT:
 681                         elems->peering = pos;
 682                         elems->peering_len = elen;
 683                         break;
 684                 case WLAN_EID_PREQ:
 685                         elems->preq = pos;
 686                         elems->preq_len = elen;
 687                         break;
 688                 case WLAN_EID_PREP:
 689                         elems->prep = pos;
 690                         elems->prep_len = elen;
 691                         break;
 692                 case WLAN_EID_PERR:
 693                         elems->perr = pos;
 694                         elems->perr_len = elen;
 695                         break;
 696                 case WLAN_EID_RANN:
 697                         if (elen >= sizeof(struct ieee80211_rann_ie))
 698                                 elems->rann = (void *)pos;
 699                         break;
 700                 case WLAN_EID_CHANNEL_SWITCH:
 701                         elems->ch_switch_elem = pos;
 702                         elems->ch_switch_elem_len = elen;
 703                         break;
 704                 case WLAN_EID_QUIET:
 705                         if (!elems->quiet_elem) {
 706                                 elems->quiet_elem = pos;
 707                                 elems->quiet_elem_len = elen;
 708                         }
 709                         elems->num_of_quiet_elem++;
 710                         break;
 711                 case WLAN_EID_COUNTRY:
 712                         elems->country_elem = pos;
 713                         elems->country_elem_len = elen;
 714                         break;
 715                 case WLAN_EID_PWR_CONSTRAINT:
 716                         elems->pwr_constr_elem = pos;
 717                         elems->pwr_constr_elem_len = elen;
 718                         break;
 719                 case WLAN_EID_TIMEOUT_INTERVAL:
 720                         elems->timeout_int = pos;
 721                         elems->timeout_int_len = elen;
 722                         break;
 723                 default:
 724                         break;
 725                 }
 726
 727                 left -= elen;
 728                 pos += elen;
 729         }
 730
 731         return crc;
 732 }
 733
 734 void ieee802_11_parse_elems(u8 *start, size_t len,
 735                             struct ieee802_11_elems *elems)
 736 {
 737         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 738 }
 739
 740 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 741 {
 742         struct ieee80211_local *local = sdata->local;
 743         struct ieee80211_tx_queue_params qparam;
 744         int queue;
 745         bool use_11b;
 746         int aCWmin, aCWmax;
 747
 748         if (!local->ops->conf_tx)
 749                 return;
 750
 751         memset(&qparam, 0, sizeof(qparam));
 752
 753         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 754                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 755
 756         for (queue = 0; queue < local->hw.queues; queue++) {
 757                 /* Set defaults according to 802.11-2007 Table 7-37 */
 758                 aCWmax = 1023;
 759                 if (use_11b)
 760                         aCWmin = 31;
 761                 else
 762                         aCWmin = 15;
 763
 764                 switch (queue) {
 765                 case 3: /* AC_BK */
 766                         qparam.cw_max = aCWmax;
 767                         qparam.cw_min = aCWmin;
 768                         qparam.txop = 0;
 769                         qparam.aifs = 7;
 770                         break;
 771                 default: /* never happens but let's not leave undefined */
 772                 case 2: /* AC_BE */
 773                         qparam.cw_max = aCWmax;
 774                         qparam.cw_min = aCWmin;
 775                         qparam.txop = 0;
 776                         qparam.aifs = 3;
 777                         break;
 778                 case 1: /* AC_VI */
 779                         qparam.cw_max = aCWmin;
 780                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 781                         if (use_11b)
 782                                 qparam.txop = 6016/32;
 783                         else
 784                                 qparam.txop = 3008/32;
 785                         qparam.aifs = 2;
 786                         break;
 787                 case 0: /* AC_VO */
 788                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 789                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 790                         if (use_11b)
 791                                 qparam.txop = 3264/32;
 792                         else
 793                                 qparam.txop = 1504/32;
 794                         qparam.aifs = 2;
 795                         break;
 796                 }
 797
 798                 qparam.uapsd = false;
 799
 800                 sdata->tx_conf[queue] = qparam;
 801                 drv_conf_tx(local, sdata, queue, &qparam);
 802         }
 803
 804         /* after reinitialize QoS TX queues setting to default,
 805          * disable QoS at all */
 806
 807         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 808                 sdata->vif.bss_conf.qos =
 809                         sdata->vif.type != NL80211_IFTYPE_STATION;
 810                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 811         }
 812 }
 813
 814 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 815                                   const size_t supp_rates_len,
 816                                   const u8 *supp_rates)
 817 {
 818         struct ieee80211_local *local = sdata->local;
 819         int i, have_higher_than_11mbit = 0;
 820
 821         /* cf. IEEE 802.11 9.2.12 */
 822         for (i = 0; i < supp_rates_len; i++)
 823                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 824                         have_higher_than_11mbit = 1;
 825
 826         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 827             have_higher_than_11mbit)
 828                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 829         else
 830                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 831
 832         ieee80211_set_wmm_default(sdata);
 833 }
 834
 835 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 836                               enum ieee80211_band band)
 837 {
 838         struct ieee80211_supported_band *sband;
 839         struct ieee80211_rate *bitrates;
 840         u32 mandatory_rates;
 841         enum ieee80211_rate_flags mandatory_flag;
 842         int i;
 843
 844         sband = local->hw.wiphy->bands[band];
 845         if (!sband) {
 846                 WARN_ON(1);
 847                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 848         }
 849
 850         if (band == IEEE80211_BAND_2GHZ)
 851                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 852         else
 853                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 854
 855         bitrates = sband->bitrates;
 856         mandatory_rates = 0;
 857         for (i = 0; i < sband->n_bitrates; i++)
 858                 if (bitrates[i].flags & mandatory_flag)
 859                         mandatory_rates |= BIT(i);
 860         return mandatory_rates;
 861 }
 862
 863 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 864                          u16 transaction, u16 auth_alg,
 865                          u8 *extra, size_t extra_len, const u8 *da,
 866                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 867 {
 868         struct ieee80211_local *local = sdata->local;
 869         struct sk_buff *skb;
 870         struct ieee80211_mgmt *mgmt;
 871         int err;
 872
 873         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 874                             sizeof(*mgmt) + 6 + extra_len);
 875         if (!skb)
 876                 return;
 877
 878         skb_reserve(skb, local->hw.extra_tx_headroom);
 879
 880         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 881         memset(mgmt, 0, 24 + 6);
 882         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 883                                           IEEE80211_STYPE_AUTH);
 884         memcpy(mgmt->da, da, ETH_ALEN);
 885         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 886         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 887         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 888         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 889         mgmt->u.auth.status_code = cpu_to_le16(0);
 890         if (extra)
 891                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 892
 893         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 894                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 895                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 896                 WARN_ON(err);
 897         }
 898
 899         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 900         ieee80211_tx_skb(sdata, skb);
 901 }
 902
 903 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 904                              const u8 *ie, size_t ie_len,
 905                              enum ieee80211_band band, u32 rate_mask,
 906                              u8 channel)
 907 {
 908         struct ieee80211_supported_band *sband;
 909         u8 *pos;
 910         size_t offset = 0, noffset;
 911         int supp_rates_len, i;
 912         u8 rates[32];
 913         int num_rates;
 914         int ext_rates_len;
 915
 916         sband = local->hw.wiphy->bands[band];
 917
 918         pos = buffer;
 919
 920         num_rates = 0;
 921         for (i = 0; i < sband->n_bitrates; i++) {
 922                 if ((BIT(i) & rate_mask) == 0)
 923                         continue; /* skip rate */
 924                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
 925         }
 926
 927         supp_rates_len = min_t(int, num_rates, 8);
 928
 929         *pos++ = WLAN_EID_SUPP_RATES;
 930         *pos++ = supp_rates_len;
 931         memcpy(pos, rates, supp_rates_len);
 932         pos += supp_rates_len;
 933
 934         /* insert "request information" if in custom IEs */
 935         if (ie && ie_len) {
 936                 static const u8 before_extrates[] = {
 937                         WLAN_EID_SSID,
 938                         WLAN_EID_SUPP_RATES,
 939                         WLAN_EID_REQUEST,
 940                 };
 941                 noffset = ieee80211_ie_split(ie, ie_len,
 942                                              before_extrates,
 943                                              ARRAY_SIZE(before_extrates),
 944                                              offset);
 945                 memcpy(pos, ie + offset, noffset - offset);
 946                 pos += noffset - offset;
 947                 offset = noffset;
 948         }
 949
 950         ext_rates_len = num_rates - supp_rates_len;
 951         if (ext_rates_len > 0) {
 952                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 953                 *pos++ = ext_rates_len;
 954                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
 955                 pos += ext_rates_len;
 956         }
 957
 958         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
 959                 *pos++ = WLAN_EID_DS_PARAMS;
 960                 *pos++ = 1;
 961                 *pos++ = channel;
 962         }
 963
 964         /* insert custom IEs that go before HT */
 965         if (ie && ie_len) {
 966                 static const u8 before_ht[] = {
 967                         WLAN_EID_SSID,
 968                         WLAN_EID_SUPP_RATES,
 969                         WLAN_EID_REQUEST,
 970                         WLAN_EID_EXT_SUPP_RATES,
 971                         WLAN_EID_DS_PARAMS,
 972                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 973                 };
 974                 noffset = ieee80211_ie_split(ie, ie_len,
 975                                              before_ht, ARRAY_SIZE(before_ht),
 976                                              offset);
 977                 memcpy(pos, ie + offset, noffset - offset);
 978                 pos += noffset - offset;
 979                 offset = noffset;
 980         }
 981
 982         if (sband->ht_cap.ht_supported)
 983                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
 984                                                 sband->ht_cap.cap);
 985
 986         /*
 987          * If adding more here, adjust code in main.c
 988          * that calculates local->scan_ies_len.
 989          */
 990
 991         /* add any remaining custom IEs */
 992         if (ie && ie_len) {
 993                 noffset = ie_len;
 994                 memcpy(pos, ie + offset, noffset - offset);
 995                 pos += noffset - offset;
 996         }
 997
 998         return pos - buffer;
 999 }
1000
1001 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1002                                           u8 *dst, u32 ratemask,
1003                                           const u8 *ssid, size_t ssid_len,
1004                                           const u8 *ie, size_t ie_len,
1005                                           bool directed)
1006 {
1007         struct ieee80211_local *local = sdata->local;
1008         struct sk_buff *skb;
1009         struct ieee80211_mgmt *mgmt;
1010         size_t buf_len;
1011         u8 *buf;
1012         u8 chan;
1013
1014         /* FIXME: come up with a proper value */
1015         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1016         if (!buf)
1017                 return NULL;
1018
1019         /*
1020          * Do not send DS Channel parameter for directed probe requests
1021          * in order to maximize the chance that we get a response.  Some
1022          * badly-behaved APs don't respond when this parameter is included.
1023          */
1024         if (directed)
1025                 chan = 0;
1026         else
1027                 chan = ieee80211_frequency_to_channel(
1028                         local->hw.conf.channel->center_freq);
1029
1030         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1031                                            local->hw.conf.channel->band,
1032                                            ratemask, chan);
1033
1034         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1035                                      ssid, ssid_len,
1036                                      buf, buf_len);
1037         if (!skb)
1038                 goto out;
1039
1040         if (dst) {
1041                 mgmt = (struct ieee80211_mgmt *) skb->data;
1042                 memcpy(mgmt->da, dst, ETH_ALEN);
1043                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1044         }
1045
1046         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1047
1048  out:
1049         kfree(buf);
1050
1051         return skb;
1052 }
1053
1054 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1055                               const u8 *ssid, size_t ssid_len,
1056                               const u8 *ie, size_t ie_len,
1057                               u32 ratemask, bool directed, bool no_cck)
1058 {
1059         struct sk_buff *skb;
1060
1061         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1062                                         ie, ie_len, directed);
1063         if (skb) {
1064                 if (no_cck)
1065                         IEEE80211_SKB_CB(skb)->flags |=
1066                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1067                 ieee80211_tx_skb(sdata, skb);
1068         }
1069 }
1070
1071 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1072                             struct ieee802_11_elems *elems,
1073                             enum ieee80211_band band)
1074 {
1075         struct ieee80211_supported_band *sband;
1076         struct ieee80211_rate *bitrates;
1077         size_t num_rates;
1078         u32 supp_rates;
1079         int i, j;
1080         sband = local->hw.wiphy->bands[band];
1081
1082         if (!sband) {
1083                 WARN_ON(1);
1084                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1085         }
1086
1087         bitrates = sband->bitrates;
1088         num_rates = sband->n_bitrates;
1089         supp_rates = 0;
1090         for (i = 0; i < elems->supp_rates_len +
1091                      elems->ext_supp_rates_len; i++) {
1092                 u8 rate = 0;
1093                 int own_rate;
1094                 if (i < elems->supp_rates_len)
1095                         rate = elems->supp_rates[i];
1096                 else if (elems->ext_supp_rates)
1097                         rate = elems->ext_supp_rates
1098                                 [i - elems->supp_rates_len];
1099                 own_rate = 5 * (rate & 0x7f);
1100                 for (j = 0; j < num_rates; j++)
1101                         if (bitrates[j].bitrate == own_rate)
1102                                 supp_rates |= BIT(j);
1103         }
1104         return supp_rates;
1105 }
1106
1107 void ieee80211_stop_device(struct ieee80211_local *local)
1108 {
1109         ieee80211_led_radio(local, false);
1110         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1111
1112         cancel_work_sync(&local->reconfig_filter);
1113
1114         flush_workqueue(local->workqueue);
1115         drv_stop(local);
1116 }
1117
1118 int ieee80211_reconfig(struct ieee80211_local *local)
1119 {
1120         struct ieee80211_hw *hw = &local->hw;
1121         struct ieee80211_sub_if_data *sdata;
1122         struct sta_info *sta;
1123         int res, i;
1124
1125 #ifdef CONFIG_PM
1126         if (local->suspended)
1127                 local->resuming = true;
1128
1129         if (local->wowlan) {
1130                 local->wowlan = false;
1131                 res = drv_resume(local);
1132                 if (res < 0) {
1133                         local->resuming = false;
1134                         return res;
1135                 }
1136                 if (res == 0)
1137                         goto wake_up;
1138                 WARN_ON(res > 1);
1139                 /*
1140                  * res is 1, which means the driver requested
1141                  * to go through a regular reset on wakeup.
1142                  */
1143         }
1144 #endif
1145         /* everything else happens only if HW was up & running */
1146         if (!local->open_count)
1147                 goto wake_up;
1148
1149         /*
1150          * Upon resume hardware can sometimes be goofy due to
1151          * various platform / driver / bus issues, so restarting
1152          * the device may at times not work immediately. Propagate
1153          * the error.
1154          */
1155         res = drv_start(local);
1156         if (res) {
1157                 WARN(local->suspended, "Hardware became unavailable "
1158                      "upon resume. This could be a software issue "
1159                      "prior to suspend or a hardware issue.\n");
1160                 return res;
1161         }
1162
1163         /* setup fragmentation threshold */
1164         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1165
1166         /* setup RTS threshold */
1167         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1168
1169         /* reset coverage class */
1170         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1171
1172         ieee80211_led_radio(local, true);
1173         ieee80211_mod_tpt_led_trig(local,
1174                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1175
1176         /* add interfaces */
1177         list_for_each_entry(sdata, &local->interfaces, list) {
1178                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1179                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1180                     ieee80211_sdata_running(sdata))
1181                         res = drv_add_interface(local, sdata);
1182         }
1183
1184         /* add STAs back */
1185         mutex_lock(&local->sta_mtx);
1186         list_for_each_entry(sta, &local->sta_list, list) {
1187                 if (sta->uploaded) {
1188                         enum ieee80211_sta_state state;
1189
1190                         for (state = IEEE80211_STA_NOTEXIST;
1191                              state < sta->sta_state - 1; state++)
1192                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
1193                                                       state, state + 1));
1194                 }
1195         }
1196         mutex_unlock(&local->sta_mtx);
1197
1198         /* reconfigure tx conf */
1199         list_for_each_entry(sdata, &local->interfaces, list) {
1200                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1201                     sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1202                     !ieee80211_sdata_running(sdata))
1203                         continue;
1204
1205                 for (i = 0; i < hw->queues; i++)
1206                         drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1207         }
1208
1209         /* reconfigure hardware */
1210         ieee80211_hw_config(local, ~0);
1211
1212         ieee80211_configure_filter(local);
1213
1214         /* Finally also reconfigure all the BSS information */
1215         list_for_each_entry(sdata, &local->interfaces, list) {
1216                 u32 changed;
1217
1218                 if (!ieee80211_sdata_running(sdata))
1219                         continue;
1220
1221                 /* common change flags for all interface types */
1222                 changed = BSS_CHANGED_ERP_CTS_PROT |
1223                           BSS_CHANGED_ERP_PREAMBLE |
1224                           BSS_CHANGED_ERP_SLOT |
1225                           BSS_CHANGED_HT |
1226                           BSS_CHANGED_BASIC_RATES |
1227                           BSS_CHANGED_BEACON_INT |
1228                           BSS_CHANGED_BSSID |
1229                           BSS_CHANGED_CQM |
1230                           BSS_CHANGED_QOS |
1231                           BSS_CHANGED_IDLE;
1232
1233                 switch (sdata->vif.type) {
1234                 case NL80211_IFTYPE_STATION:
1235                         changed |= BSS_CHANGED_ASSOC |
1236                                    BSS_CHANGED_ARP_FILTER;
1237                         mutex_lock(&sdata->u.mgd.mtx);
1238                         ieee80211_bss_info_change_notify(sdata, changed);
1239                         mutex_unlock(&sdata->u.mgd.mtx);
1240                         break;
1241                 case NL80211_IFTYPE_ADHOC:
1242                         changed |= BSS_CHANGED_IBSS;
1243                         /* fall through */
1244                 case NL80211_IFTYPE_AP:
1245                         changed |= BSS_CHANGED_SSID;
1246
1247                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1248                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1249
1250                         /* fall through */
1251                 case NL80211_IFTYPE_MESH_POINT:
1252                         changed |= BSS_CHANGED_BEACON |
1253                                    BSS_CHANGED_BEACON_ENABLED;
1254                         ieee80211_bss_info_change_notify(sdata, changed);
1255                         break;
1256                 case NL80211_IFTYPE_WDS:
1257                         break;
1258                 case NL80211_IFTYPE_AP_VLAN:
1259                 case NL80211_IFTYPE_MONITOR:
1260                         /* ignore virtual */
1261                         break;
1262                 case NL80211_IFTYPE_UNSPECIFIED:
1263                 case NUM_NL80211_IFTYPES:
1264                 case NL80211_IFTYPE_P2P_CLIENT:
1265                 case NL80211_IFTYPE_P2P_GO:
1266                         WARN_ON(1);
1267                         break;
1268                 }
1269         }
1270
1271         ieee80211_recalc_ps(local, -1);
1272
1273         /*
1274          * The sta might be in psm against the ap (e.g. because
1275          * this was the state before a hw restart), so we
1276          * explicitly send a null packet in order to make sure
1277          * it'll sync against the ap (and get out of psm).
1278          */
1279         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1280                 list_for_each_entry(sdata, &local->interfaces, list) {
1281                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1282                                 continue;
1283
1284                         ieee80211_send_nullfunc(local, sdata, 0);
1285                 }
1286         }
1287
1288         /*
1289          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1290          * sessions can be established after a resume.
1291          *
1292          * Also tear down aggregation sessions since reconfiguring
1293          * them in a hardware restart scenario is not easily done
1294          * right now, and the hardware will have lost information
1295          * about the sessions, but we and the AP still think they
1296          * are active. This is really a workaround though.
1297          */
1298         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1299                 mutex_lock(&local->sta_mtx);
1300
1301                 list_for_each_entry(sta, &local->sta_list, list) {
1302                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1303                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1304                 }
1305
1306                 mutex_unlock(&local->sta_mtx);
1307         }
1308
1309         /* add back keys */
1310         list_for_each_entry(sdata, &local->interfaces, list)
1311                 if (ieee80211_sdata_running(sdata))
1312                         ieee80211_enable_keys(sdata);
1313
1314  wake_up:
1315         ieee80211_wake_queues_by_reason(hw,
1316                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1317
1318         /*
1319          * If this is for hw restart things are still running.
1320          * We may want to change that later, however.
1321          */
1322         if (!local->suspended)
1323                 return 0;
1324
1325 #ifdef CONFIG_PM
1326         /* first set suspended false, then resuming */
1327         local->suspended = false;
1328         mb();
1329         local->resuming = false;
1330
1331         list_for_each_entry(sdata, &local->interfaces, list) {
1332                 switch(sdata->vif.type) {
1333                 case NL80211_IFTYPE_STATION:
1334                         ieee80211_sta_restart(sdata);
1335                         break;
1336                 case NL80211_IFTYPE_ADHOC:
1337                         ieee80211_ibss_restart(sdata);
1338                         break;
1339                 case NL80211_IFTYPE_MESH_POINT:
1340                         ieee80211_mesh_restart(sdata);
1341                         break;
1342                 default:
1343                         break;
1344                 }
1345         }
1346
1347         mod_timer(&local->sta_cleanup, jiffies + 1);
1348
1349         mutex_lock(&local->sta_mtx);
1350         list_for_each_entry(sta, &local->sta_list, list)
1351                 mesh_plink_restart(sta);
1352         mutex_unlock(&local->sta_mtx);
1353 #else
1354         WARN_ON(1);
1355 #endif
1356         return 0;
1357 }
1358
1359 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1360 {
1361         struct ieee80211_sub_if_data *sdata;
1362         struct ieee80211_local *local;
1363         struct ieee80211_key *key;
1364
1365         if (WARN_ON(!vif))
1366                 return;
1367
1368         sdata = vif_to_sdata(vif);
1369         local = sdata->local;
1370
1371         if (WARN_ON(!local->resuming))
1372                 return;
1373
1374         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1375                 return;
1376
1377         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1378
1379         mutex_lock(&local->key_mtx);
1380         list_for_each_entry(key, &sdata->key_list, list)
1381                 key->flags |= KEY_FLAG_TAINTED;
1382         mutex_unlock(&local->key_mtx);
1383 }
1384 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1385
1386 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1387                           enum ieee80211_smps_mode *smps_mode)
1388 {
1389         if (ifmgd->associated) {
1390                 *smps_mode = ifmgd->ap_smps;
1391
1392                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1393                         if (ifmgd->powersave)
1394                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1395                         else
1396                                 *smps_mode = IEEE80211_SMPS_OFF;
1397                 }
1398
1399                 return 1;
1400         }
1401
1402         return 0;
1403 }
1404
1405 /* must hold iflist_mtx */
1406 void ieee80211_recalc_smps(struct ieee80211_local *local)
1407 {
1408         struct ieee80211_sub_if_data *sdata;
1409         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1410         int count = 0;
1411
1412         lockdep_assert_held(&local->iflist_mtx);
1413
1414         /*
1415          * This function could be improved to handle multiple
1416          * interfaces better, but right now it makes any
1417          * non-station interfaces force SM PS to be turned
1418          * off. If there are multiple station interfaces it
1419          * could also use the best possible mode, e.g. if
1420          * one is in static and the other in dynamic then
1421          * dynamic is ok.
1422          */
1423
1424         list_for_each_entry(sdata, &local->interfaces, list) {
1425                 if (!ieee80211_sdata_running(sdata))
1426                         continue;
1427                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1428                         goto set;
1429
1430                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1431
1432                 if (count > 1) {
1433                         smps_mode = IEEE80211_SMPS_OFF;
1434                         break;
1435                 }
1436         }
1437
1438         if (smps_mode == local->smps_mode)
1439                 return;
1440
1441  set:
1442         local->smps_mode = smps_mode;
1443         /* changed flag is auto-detected for this */
1444         ieee80211_hw_config(local, 0);
1445 }
1446
1447 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1448 {
1449         int i;
1450
1451         for (i = 0; i < n_ids; i++)
1452                 if (ids[i] == id)
1453                         return true;
1454         return false;
1455 }
1456
1457 /**
1458  * ieee80211_ie_split - split an IE buffer according to ordering
1459  *
1460  * @ies: the IE buffer
1461  * @ielen: the length of the IE buffer
1462  * @ids: an array with element IDs that are allowed before
1463  *      the split
1464  * @n_ids: the size of the element ID array
1465  * @offset: offset where to start splitting in the buffer
1466  *
1467  * This function splits an IE buffer by updating the @offset
1468  * variable to point to the location where the buffer should be
1469  * split.
1470  *
1471  * It assumes that the given IE buffer is well-formed, this
1472  * has to be guaranteed by the caller!
1473  *
1474  * It also assumes that the IEs in the buffer are ordered
1475  * correctly, if not the result of using this function will not
1476  * be ordered correctly either, i.e. it does no reordering.
1477  *
1478  * The function returns the offset where the next part of the
1479  * buffer starts, which may be @ielen if the entire (remainder)
1480  * of the buffer should be used.
1481  */
1482 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1483                           const u8 *ids, int n_ids, size_t offset)
1484 {
1485         size_t pos = offset;
1486
1487         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1488                 pos += 2 + ies[pos + 1];
1489
1490         return pos;
1491 }
1492
1493 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1494 {
1495         size_t pos = offset;
1496
1497         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1498                 pos += 2 + ies[pos + 1];
1499
1500         return pos;
1501 }
1502
1503 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1504                                             int rssi_min_thold,
1505                                             int rssi_max_thold)
1506 {
1507         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1508
1509         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1510                 return;
1511
1512         /*
1513          * Scale up threshold values before storing it, as the RSSI averaging
1514          * algorithm uses a scaled up value as well. Change this scaling
1515          * factor if the RSSI averaging algorithm changes.
1516          */
1517         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1518         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1519 }
1520
1521 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1522                                     int rssi_min_thold,
1523                                     int rssi_max_thold)
1524 {
1525         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1526
1527         WARN_ON(rssi_min_thold == rssi_max_thold ||
1528                 rssi_min_thold > rssi_max_thold);
1529
1530         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1531                                        rssi_max_thold);
1532 }
1533 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1534
1535 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1536 {
1537         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1538
1539         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1540 }
1541 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1542
1543 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1544                               u16 cap)
1545 {
1546         __le16 tmp;
1547
1548         *pos++ = WLAN_EID_HT_CAPABILITY;
1549         *pos++ = sizeof(struct ieee80211_ht_cap);
1550         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1551
1552         /* capability flags */
1553         tmp = cpu_to_le16(cap);
1554         memcpy(pos, &tmp, sizeof(u16));
1555         pos += sizeof(u16);
1556
1557         /* AMPDU parameters */
1558         *pos++ = ht_cap->ampdu_factor |
1559                  (ht_cap->ampdu_density <<
1560                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1561
1562         /* MCS set */
1563         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1564         pos += sizeof(ht_cap->mcs);
1565
1566         /* extended capabilities */
1567         pos += sizeof(__le16);
1568
1569         /* BF capabilities */
1570         pos += sizeof(__le32);
1571
1572         /* antenna selection */
1573         pos += sizeof(u8);
1574
1575         return pos;
1576 }
1577
1578 u8 *ieee80211_ie_build_ht_info(u8 *pos,
1579                                struct ieee80211_sta_ht_cap *ht_cap,
1580                                struct ieee80211_channel *channel,
1581                                enum nl80211_channel_type channel_type)
1582 {
1583         struct ieee80211_ht_info *ht_info;
1584         /* Build HT Information */
1585         *pos++ = WLAN_EID_HT_INFORMATION;
1586         *pos++ = sizeof(struct ieee80211_ht_info);
1587         ht_info = (struct ieee80211_ht_info *)pos;
1588         ht_info->control_chan =
1589                         ieee80211_frequency_to_channel(channel->center_freq);
1590         switch (channel_type) {
1591         case NL80211_CHAN_HT40MINUS:
1592                 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1593                 break;
1594         case NL80211_CHAN_HT40PLUS:
1595                 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1596                 break;
1597         case NL80211_CHAN_HT20:
1598         default:
1599                 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1600                 break;
1601         }
1602         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
1603                 ht_info->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1604
1605         /*
1606          * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and
1607          * RIFS Mode are reserved in IBSS mode, therefore keep them at 0
1608          */
1609         ht_info->operation_mode = 0x0000;
1610         ht_info->stbc_param = 0x0000;
1611
1612         /* It seems that Basic MCS set and Supported MCS set
1613            are identical for the first 10 bytes */
1614         memset(&ht_info->basic_set, 0, 16);
1615         memcpy(&ht_info->basic_set, &ht_cap->mcs, 10);
1616
1617         return pos + sizeof(struct ieee80211_ht_info);
1618 }
1619
1620 enum nl80211_channel_type
1621 ieee80211_ht_info_to_channel_type(struct ieee80211_ht_info *ht_info)
1622 {
1623         enum nl80211_channel_type channel_type;
1624
1625         if (!ht_info)
1626                 return NL80211_CHAN_NO_HT;
1627
1628         switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1629         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1630                 channel_type = NL80211_CHAN_HT20;
1631                 break;
1632         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1633                 channel_type = NL80211_CHAN_HT40PLUS;
1634                 break;
1635         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1636                 channel_type = NL80211_CHAN_HT40MINUS;
1637                 break;
1638         default:
1639                 channel_type = NL80211_CHAN_NO_HT;
1640         }
1641
1642         return channel_type;
1643 }
1644
1645 int ieee80211_add_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, rates, *pos;
1652
1653         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1654         rates = sband->n_bitrates;
1655         if (rates > 8)
1656                 rates = 8;
1657
1658         if (skb_tailroom(skb) < rates + 2)
1659                 return -ENOMEM;
1660
1661         pos = skb_put(skb, rates + 2);
1662         *pos++ = WLAN_EID_SUPP_RATES;
1663         *pos++ = rates;
1664         for (i = 0; i < rates; i++) {
1665                 rate = sband->bitrates[i].bitrate;
1666                 *pos++ = (u8) (rate / 5);
1667         }
1668
1669         return 0;
1670 }
1671
1672 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1673 {
1674         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1675         struct ieee80211_local *local = sdata->local;
1676         struct ieee80211_supported_band *sband;
1677         int rate;
1678         u8 i, exrates, *pos;
1679
1680         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1681         exrates = sband->n_bitrates;
1682         if (exrates > 8)
1683                 exrates -= 8;
1684         else
1685                 exrates = 0;
1686
1687         if (skb_tailroom(skb) < exrates + 2)
1688                 return -ENOMEM;
1689
1690         if (exrates) {
1691                 pos = skb_put(skb, exrates + 2);
1692                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1693                 *pos++ = exrates;
1694                 for (i = 8; i < sband->n_bitrates; i++) {
1695                         rate = sband->bitrates[i].bitrate;
1696                         *pos++ = (u8) (rate / 5);
1697                 }
1698         }
1699         return 0;
1700 }