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(enum ieee80211_band band, 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 (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                                         enum ieee80211_band band,
 166                                         size_t frame_len,
 167                                         struct ieee80211_rate *rate)
 168 {
 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(band, 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[frame_txctl->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(sband->band, 10, rate->bitrate,
 217                                        erp, short_preamble);
 218         /* Data frame duration */
 219         dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
 220                                         erp, short_preamble);
 221         /* ACK duration */
 222         dur += ieee80211_frame_duration(sband->band, 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[frame_txctl->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(sband->band, 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(sband->band, 10, rate->bitrate,
 261                                                 erp, short_preamble);
 262         }
 263
 264         return cpu_to_le16(dur);
 265 }
 266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 269 {
 270         struct ieee80211_sub_if_data *sdata;
 271
 272         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 273                 int ac;
 274
 275                 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 276                         continue;
 277
 278                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 279                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 280                         continue;
 281
 282                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 283                         int ac_queue = sdata->vif.hw_queue[ac];
 284
 285                         if (ac_queue == queue ||
 286                             (sdata->vif.cab_queue == queue &&
 287                              local->queue_stop_reasons[ac_queue] == 0 &&
 288                              skb_queue_empty(&local->pending[ac_queue])))
 289                                 netif_wake_subqueue(sdata->dev, ac);
 290                 }
 291         }
 292 }
 293
 294 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 295                                    enum queue_stop_reason reason)
 296 {
 297         struct ieee80211_local *local = hw_to_local(hw);
 298
 299         trace_wake_queue(local, queue, reason);
 300
 301         if (WARN_ON(queue >= hw->queues))
 302                 return;
 303
 304         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 305                 return;
 306
 307         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 308
 309         if (local->queue_stop_reasons[queue] != 0)
 310                 /* someone still has this queue stopped */
 311                 return;
 312
 313         if (skb_queue_empty(&local->pending[queue])) {
 314                 rcu_read_lock();
 315                 ieee80211_propagate_queue_wake(local, queue);
 316                 rcu_read_unlock();
 317         } else
 318                 tasklet_schedule(&local->tx_pending_tasklet);
 319 }
 320
 321 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 322                                     enum queue_stop_reason reason)
 323 {
 324         struct ieee80211_local *local = hw_to_local(hw);
 325         unsigned long flags;
 326
 327         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 328         __ieee80211_wake_queue(hw, queue, reason);
 329         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 330 }
 331
 332 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 333 {
 334         ieee80211_wake_queue_by_reason(hw, queue,
 335                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 336 }
 337 EXPORT_SYMBOL(ieee80211_wake_queue);
 338
 339 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 340                                    enum queue_stop_reason reason)
 341 {
 342         struct ieee80211_local *local = hw_to_local(hw);
 343         struct ieee80211_sub_if_data *sdata;
 344
 345         trace_stop_queue(local, queue, reason);
 346
 347         if (WARN_ON(queue >= hw->queues))
 348                 return;
 349
 350         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 351                 return;
 352
 353         __set_bit(reason, &local->queue_stop_reasons[queue]);
 354
 355         rcu_read_lock();
 356         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 357                 int ac;
 358
 359                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 360                         if (sdata->vif.hw_queue[ac] == queue ||
 361                             sdata->vif.cab_queue == queue)
 362                                 netif_stop_subqueue(sdata->dev, ac);
 363                 }
 364         }
 365         rcu_read_unlock();
 366 }
 367
 368 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 369                                     enum queue_stop_reason reason)
 370 {
 371         struct ieee80211_local *local = hw_to_local(hw);
 372         unsigned long flags;
 373
 374         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 375         __ieee80211_stop_queue(hw, queue, reason);
 376         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 377 }
 378
 379 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 380 {
 381         ieee80211_stop_queue_by_reason(hw, queue,
 382                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 383 }
 384 EXPORT_SYMBOL(ieee80211_stop_queue);
 385
 386 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 387                                struct sk_buff *skb)
 388 {
 389         struct ieee80211_hw *hw = &local->hw;
 390         unsigned long flags;
 391         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 392         int queue = info->hw_queue;
 393
 394         if (WARN_ON(!info->control.vif)) {
 395                 kfree_skb(skb);
 396                 return;
 397         }
 398
 399         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 400         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 401         __skb_queue_tail(&local->pending[queue], skb);
 402         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 403         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 404 }
 405
 406 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 407                                    struct sk_buff_head *skbs,
 408                                    void (*fn)(void *data), void *data)
 409 {
 410         struct ieee80211_hw *hw = &local->hw;
 411         struct sk_buff *skb;
 412         unsigned long flags;
 413         int queue, i;
 414
 415         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 416         while ((skb = skb_dequeue(skbs))) {
 417                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 418
 419                 if (WARN_ON(!info->control.vif)) {
 420                         kfree_skb(skb);
 421                         continue;
 422                 }
 423
 424                 queue = info->hw_queue;
 425
 426                 __ieee80211_stop_queue(hw, queue,
 427                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 428
 429                 __skb_queue_tail(&local->pending[queue], skb);
 430         }
 431
 432         if (fn)
 433                 fn(data);
 434
 435         for (i = 0; i < hw->queues; i++)
 436                 __ieee80211_wake_queue(hw, i,
 437                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 438         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 439 }
 440
 441 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 442                                     enum queue_stop_reason reason)
 443 {
 444         struct ieee80211_local *local = hw_to_local(hw);
 445         unsigned long flags;
 446         int i;
 447
 448         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 449
 450         for (i = 0; i < hw->queues; i++)
 451                 __ieee80211_stop_queue(hw, i, reason);
 452
 453         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 454 }
 455
 456 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 457 {
 458         ieee80211_stop_queues_by_reason(hw,
 459                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 460 }
 461 EXPORT_SYMBOL(ieee80211_stop_queues);
 462
 463 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 464 {
 465         struct ieee80211_local *local = hw_to_local(hw);
 466         unsigned long flags;
 467         int ret;
 468
 469         if (WARN_ON(queue >= hw->queues))
 470                 return true;
 471
 472         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 473         ret = !!local->queue_stop_reasons[queue];
 474         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 475         return ret;
 476 }
 477 EXPORT_SYMBOL(ieee80211_queue_stopped);
 478
 479 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 480                                      enum queue_stop_reason reason)
 481 {
 482         struct ieee80211_local *local = hw_to_local(hw);
 483         unsigned long flags;
 484         int i;
 485
 486         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 487
 488         for (i = 0; i < hw->queues; i++)
 489                 __ieee80211_wake_queue(hw, i, reason);
 490
 491         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 492 }
 493
 494 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 495 {
 496         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 497 }
 498 EXPORT_SYMBOL(ieee80211_wake_queues);
 499
 500 void ieee80211_iterate_active_interfaces(
 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         mutex_lock(&local->iflist_mtx);
 510
 511         list_for_each_entry(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         mutex_unlock(&local->iflist_mtx);
 525 }
 526 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 527
 528 void ieee80211_iterate_active_interfaces_atomic(
 529         struct ieee80211_hw *hw,
 530         void (*iterator)(void *data, u8 *mac,
 531                          struct ieee80211_vif *vif),
 532         void *data)
 533 {
 534         struct ieee80211_local *local = hw_to_local(hw);
 535         struct ieee80211_sub_if_data *sdata;
 536
 537         rcu_read_lock();
 538
 539         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 540                 switch (sdata->vif.type) {
 541                 case NL80211_IFTYPE_MONITOR:
 542                 case NL80211_IFTYPE_AP_VLAN:
 543                         continue;
 544                 default:
 545                         break;
 546                 }
 547                 if (ieee80211_sdata_running(sdata))
 548                         iterator(data, sdata->vif.addr,
 549                                  &sdata->vif);
 550         }
 551
 552         rcu_read_unlock();
 553 }
 554 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 555
 556 /*
 557  * Nothing should have been stuffed into the workqueue during
 558  * the suspend->resume cycle. If this WARN is seen then there
 559  * is a bug with either the driver suspend or something in
 560  * mac80211 stuffing into the workqueue which we haven't yet
 561  * cleared during mac80211's suspend cycle.
 562  */
 563 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 564 {
 565         if (WARN(local->suspended && !local->resuming,
 566                  "queueing ieee80211 work while going to suspend\n"))
 567                 return false;
 568
 569         return true;
 570 }
 571
 572 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 573 {
 574         struct ieee80211_local *local = hw_to_local(hw);
 575
 576         if (!ieee80211_can_queue_work(local))
 577                 return;
 578
 579         queue_work(local->workqueue, work);
 580 }
 581 EXPORT_SYMBOL(ieee80211_queue_work);
 582
 583 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 584                                   struct delayed_work *dwork,
 585                                   unsigned long delay)
 586 {
 587         struct ieee80211_local *local = hw_to_local(hw);
 588
 589         if (!ieee80211_can_queue_work(local))
 590                 return;
 591
 592         queue_delayed_work(local->workqueue, dwork, delay);
 593 }
 594 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 595
 596 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 597                                struct ieee802_11_elems *elems,
 598                                u64 filter, u32 crc)
 599 {
 600         size_t left = len;
 601         u8 *pos = start;
 602         bool calc_crc = filter != 0;
 603         DECLARE_BITMAP(seen_elems, 256);
 604
 605         bitmap_zero(seen_elems, 256);
 606         memset(elems, 0, sizeof(*elems));
 607         elems->ie_start = start;
 608         elems->total_len = len;
 609
 610         while (left >= 2) {
 611                 u8 id, elen;
 612                 bool elem_parse_failed;
 613
 614                 id = *pos++;
 615                 elen = *pos++;
 616                 left -= 2;
 617
 618                 if (elen > left) {
 619                         elems->parse_error = true;
 620                         break;
 621                 }
 622
 623                 if (id != WLAN_EID_VENDOR_SPECIFIC &&
 624                     id != WLAN_EID_QUIET &&
 625                     test_bit(id, seen_elems)) {
 626                         elems->parse_error = true;
 627                         left -= elen;
 628                         pos += elen;
 629                         continue;
 630                 }
 631
 632                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 633                         crc = crc32_be(crc, pos - 2, elen + 2);
 634
 635                 elem_parse_failed = false;
 636
 637                 switch (id) {
 638                 case WLAN_EID_SSID:
 639                         elems->ssid = pos;
 640                         elems->ssid_len = elen;
 641                         break;
 642                 case WLAN_EID_SUPP_RATES:
 643                         elems->supp_rates = pos;
 644                         elems->supp_rates_len = elen;
 645                         break;
 646                 case WLAN_EID_FH_PARAMS:
 647                         elems->fh_params = pos;
 648                         elems->fh_params_len = elen;
 649                         break;
 650                 case WLAN_EID_DS_PARAMS:
 651                         elems->ds_params = pos;
 652                         elems->ds_params_len = elen;
 653                         break;
 654                 case WLAN_EID_CF_PARAMS:
 655                         elems->cf_params = pos;
 656                         elems->cf_params_len = elen;
 657                         break;
 658                 case WLAN_EID_TIM:
 659                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 660                                 elems->tim = (void *)pos;
 661                                 elems->tim_len = elen;
 662                         } else
 663                                 elem_parse_failed = true;
 664                         break;
 665                 case WLAN_EID_IBSS_PARAMS:
 666                         elems->ibss_params = pos;
 667                         elems->ibss_params_len = elen;
 668                         break;
 669                 case WLAN_EID_CHALLENGE:
 670                         elems->challenge = pos;
 671                         elems->challenge_len = elen;
 672                         break;
 673                 case WLAN_EID_VENDOR_SPECIFIC:
 674                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 675                             pos[2] == 0xf2) {
 676                                 /* Microsoft OUI (00:50:F2) */
 677
 678                                 if (calc_crc)
 679                                         crc = crc32_be(crc, pos - 2, elen + 2);
 680
 681                                 if (pos[3] == 1) {
 682                                         /* OUI Type 1 - WPA IE */
 683                                         elems->wpa = pos;
 684                                         elems->wpa_len = elen;
 685                                 } else if (elen >= 5 && pos[3] == 2) {
 686                                         /* OUI Type 2 - WMM IE */
 687                                         if (pos[4] == 0) {
 688                                                 elems->wmm_info = pos;
 689                                                 elems->wmm_info_len = elen;
 690                                         } else if (pos[4] == 1) {
 691                                                 elems->wmm_param = pos;
 692                                                 elems->wmm_param_len = elen;
 693                                         }
 694                                 }
 695                         }
 696                         break;
 697                 case WLAN_EID_RSN:
 698                         elems->rsn = pos;
 699                         elems->rsn_len = elen;
 700                         break;
 701                 case WLAN_EID_ERP_INFO:
 702                         elems->erp_info = pos;
 703                         elems->erp_info_len = elen;
 704                         break;
 705                 case WLAN_EID_EXT_SUPP_RATES:
 706                         elems->ext_supp_rates = pos;
 707                         elems->ext_supp_rates_len = elen;
 708                         break;
 709                 case WLAN_EID_HT_CAPABILITY:
 710                         if (elen >= sizeof(struct ieee80211_ht_cap))
 711                                 elems->ht_cap_elem = (void *)pos;
 712                         else
 713                                 elem_parse_failed = true;
 714                         break;
 715                 case WLAN_EID_HT_OPERATION:
 716                         if (elen >= sizeof(struct ieee80211_ht_operation))
 717                                 elems->ht_operation = (void *)pos;
 718                         else
 719                                 elem_parse_failed = true;
 720                         break;
 721                 case WLAN_EID_MESH_ID:
 722                         elems->mesh_id = pos;
 723                         elems->mesh_id_len = elen;
 724                         break;
 725                 case WLAN_EID_MESH_CONFIG:
 726                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 727                                 elems->mesh_config = (void *)pos;
 728                         else
 729                                 elem_parse_failed = true;
 730                         break;
 731                 case WLAN_EID_PEER_MGMT:
 732                         elems->peering = pos;
 733                         elems->peering_len = elen;
 734                         break;
 735                 case WLAN_EID_PREQ:
 736                         elems->preq = pos;
 737                         elems->preq_len = elen;
 738                         break;
 739                 case WLAN_EID_PREP:
 740                         elems->prep = pos;
 741                         elems->prep_len = elen;
 742                         break;
 743                 case WLAN_EID_PERR:
 744                         elems->perr = pos;
 745                         elems->perr_len = elen;
 746                         break;
 747                 case WLAN_EID_RANN:
 748                         if (elen >= sizeof(struct ieee80211_rann_ie))
 749                                 elems->rann = (void *)pos;
 750                         else
 751                                 elem_parse_failed = true;
 752                         break;
 753                 case WLAN_EID_CHANNEL_SWITCH:
 754                         elems->ch_switch_elem = pos;
 755                         elems->ch_switch_elem_len = elen;
 756                         break;
 757                 case WLAN_EID_QUIET:
 758                         if (!elems->quiet_elem) {
 759                                 elems->quiet_elem = pos;
 760                                 elems->quiet_elem_len = elen;
 761                         }
 762                         elems->num_of_quiet_elem++;
 763                         break;
 764                 case WLAN_EID_COUNTRY:
 765                         elems->country_elem = pos;
 766                         elems->country_elem_len = elen;
 767                         break;
 768                 case WLAN_EID_PWR_CONSTRAINT:
 769                         elems->pwr_constr_elem = pos;
 770                         elems->pwr_constr_elem_len = elen;
 771                         break;
 772                 case WLAN_EID_TIMEOUT_INTERVAL:
 773                         elems->timeout_int = pos;
 774                         elems->timeout_int_len = elen;
 775                         break;
 776                 default:
 777                         break;
 778                 }
 779
 780                 if (elem_parse_failed)
 781                         elems->parse_error = true;
 782                 else
 783                         set_bit(id, seen_elems);
 784
 785                 left -= elen;
 786                 pos += elen;
 787         }
 788
 789         if (left != 0)
 790                 elems->parse_error = true;
 791
 792         return crc;
 793 }
 794
 795 void ieee802_11_parse_elems(u8 *start, size_t len,
 796                             struct ieee802_11_elems *elems)
 797 {
 798         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 799 }
 800
 801 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 802                                bool bss_notify)
 803 {
 804         struct ieee80211_local *local = sdata->local;
 805         struct ieee80211_tx_queue_params qparam;
 806         int ac;
 807         bool use_11b;
 808         int aCWmin, aCWmax;
 809
 810         if (!local->ops->conf_tx)
 811                 return;
 812
 813         if (local->hw.queues < IEEE80211_NUM_ACS)
 814                 return;
 815
 816         memset(&qparam, 0, sizeof(qparam));
 817
 818         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 819                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 820
 821         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 822                 /* Set defaults according to 802.11-2007 Table 7-37 */
 823                 aCWmax = 1023;
 824                 if (use_11b)
 825                         aCWmin = 31;
 826                 else
 827                         aCWmin = 15;
 828
 829                 switch (ac) {
 830                 case IEEE80211_AC_BK:
 831                         qparam.cw_max = aCWmax;
 832                         qparam.cw_min = aCWmin;
 833                         qparam.txop = 0;
 834                         qparam.aifs = 7;
 835                         break;
 836                 default: /* never happens but let's not leave undefined */
 837                 case IEEE80211_AC_BE:
 838                         qparam.cw_max = aCWmax;
 839                         qparam.cw_min = aCWmin;
 840                         qparam.txop = 0;
 841                         qparam.aifs = 3;
 842                         break;
 843                 case IEEE80211_AC_VI:
 844                         qparam.cw_max = aCWmin;
 845                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 846                         if (use_11b)
 847                                 qparam.txop = 6016/32;
 848                         else
 849                                 qparam.txop = 3008/32;
 850                         qparam.aifs = 2;
 851                         break;
 852                 case IEEE80211_AC_VO:
 853                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 854                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 855                         if (use_11b)
 856                                 qparam.txop = 3264/32;
 857                         else
 858                                 qparam.txop = 1504/32;
 859                         qparam.aifs = 2;
 860                         break;
 861                 }
 862
 863                 qparam.uapsd = false;
 864
 865                 sdata->tx_conf[ac] = qparam;
 866                 drv_conf_tx(local, sdata, ac, &qparam);
 867         }
 868
 869         /* after reinitialize QoS TX queues setting to default,
 870          * disable QoS at all */
 871
 872         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 873                 sdata->vif.bss_conf.qos =
 874                         sdata->vif.type != NL80211_IFTYPE_STATION;
 875                 if (bss_notify)
 876                         ieee80211_bss_info_change_notify(sdata,
 877                                                          BSS_CHANGED_QOS);
 878         }
 879 }
 880
 881 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 882                                   const size_t supp_rates_len,
 883                                   const u8 *supp_rates)
 884 {
 885         struct ieee80211_local *local = sdata->local;
 886         int i, have_higher_than_11mbit = 0;
 887
 888         /* cf. IEEE 802.11 9.2.12 */
 889         for (i = 0; i < supp_rates_len; i++)
 890                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 891                         have_higher_than_11mbit = 1;
 892
 893         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 894             have_higher_than_11mbit)
 895                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 896         else
 897                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 898
 899         ieee80211_set_wmm_default(sdata, true);
 900 }
 901
 902 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 903                               enum ieee80211_band band)
 904 {
 905         struct ieee80211_supported_band *sband;
 906         struct ieee80211_rate *bitrates;
 907         u32 mandatory_rates;
 908         enum ieee80211_rate_flags mandatory_flag;
 909         int i;
 910
 911         sband = local->hw.wiphy->bands[band];
 912         if (WARN_ON(!sband))
 913                 return 1;
 914
 915         if (band == IEEE80211_BAND_2GHZ)
 916                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 917         else
 918                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 919
 920         bitrates = sband->bitrates;
 921         mandatory_rates = 0;
 922         for (i = 0; i < sband->n_bitrates; i++)
 923                 if (bitrates[i].flags & mandatory_flag)
 924                         mandatory_rates |= BIT(i);
 925         return mandatory_rates;
 926 }
 927
 928 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 929                          u16 transaction, u16 auth_alg,
 930                          u8 *extra, size_t extra_len, const u8 *da,
 931                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 932 {
 933         struct ieee80211_local *local = sdata->local;
 934         struct sk_buff *skb;
 935         struct ieee80211_mgmt *mgmt;
 936         int err;
 937
 938         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 939                             sizeof(*mgmt) + 6 + extra_len);
 940         if (!skb)
 941                 return;
 942
 943         skb_reserve(skb, local->hw.extra_tx_headroom);
 944
 945         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 946         memset(mgmt, 0, 24 + 6);
 947         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 948                                           IEEE80211_STYPE_AUTH);
 949         memcpy(mgmt->da, da, ETH_ALEN);
 950         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 951         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 952         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 953         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 954         mgmt->u.auth.status_code = cpu_to_le16(0);
 955         if (extra)
 956                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 957
 958         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 959                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 960                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 961                 WARN_ON(err);
 962         }
 963
 964         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 965         ieee80211_tx_skb(sdata, skb);
 966 }
 967
 968 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 969                              const u8 *ie, size_t ie_len,
 970                              enum ieee80211_band band, u32 rate_mask,
 971                              u8 channel)
 972 {
 973         struct ieee80211_supported_band *sband;
 974         u8 *pos;
 975         size_t offset = 0, noffset;
 976         int supp_rates_len, i;
 977         u8 rates[32];
 978         int num_rates;
 979         int ext_rates_len;
 980
 981         sband = local->hw.wiphy->bands[band];
 982
 983         pos = buffer;
 984
 985         num_rates = 0;
 986         for (i = 0; i < sband->n_bitrates; i++) {
 987                 if ((BIT(i) & rate_mask) == 0)
 988                         continue; /* skip rate */
 989                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
 990         }
 991
 992         supp_rates_len = min_t(int, num_rates, 8);
 993
 994         *pos++ = WLAN_EID_SUPP_RATES;
 995         *pos++ = supp_rates_len;
 996         memcpy(pos, rates, supp_rates_len);
 997         pos += supp_rates_len;
 998
 999         /* insert "request information" if in custom IEs */
1000         if (ie && ie_len) {
1001                 static const u8 before_extrates[] = {
1002                         WLAN_EID_SSID,
1003                         WLAN_EID_SUPP_RATES,
1004                         WLAN_EID_REQUEST,
1005                 };
1006                 noffset = ieee80211_ie_split(ie, ie_len,
1007                                              before_extrates,
1008                                              ARRAY_SIZE(before_extrates),
1009                                              offset);
1010                 memcpy(pos, ie + offset, noffset - offset);
1011                 pos += noffset - offset;
1012                 offset = noffset;
1013         }
1014
1015         ext_rates_len = num_rates - supp_rates_len;
1016         if (ext_rates_len > 0) {
1017                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1018                 *pos++ = ext_rates_len;
1019                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1020                 pos += ext_rates_len;
1021         }
1022
1023         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1024                 *pos++ = WLAN_EID_DS_PARAMS;
1025                 *pos++ = 1;
1026                 *pos++ = channel;
1027         }
1028
1029         /* insert custom IEs that go before HT */
1030         if (ie && ie_len) {
1031                 static const u8 before_ht[] = {
1032                         WLAN_EID_SSID,
1033                         WLAN_EID_SUPP_RATES,
1034                         WLAN_EID_REQUEST,
1035                         WLAN_EID_EXT_SUPP_RATES,
1036                         WLAN_EID_DS_PARAMS,
1037                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1038                 };
1039                 noffset = ieee80211_ie_split(ie, ie_len,
1040                                              before_ht, ARRAY_SIZE(before_ht),
1041                                              offset);
1042                 memcpy(pos, ie + offset, noffset - offset);
1043                 pos += noffset - offset;
1044                 offset = noffset;
1045         }
1046
1047         if (sband->ht_cap.ht_supported)
1048                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1049                                                 sband->ht_cap.cap);
1050
1051         /*
1052          * If adding more here, adjust code in main.c
1053          * that calculates local->scan_ies_len.
1054          */
1055
1056         /* add any remaining custom IEs */
1057         if (ie && ie_len) {
1058                 noffset = ie_len;
1059                 memcpy(pos, ie + offset, noffset - offset);
1060                 pos += noffset - offset;
1061         }
1062
1063         return pos - buffer;
1064 }
1065
1066 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1067                                           u8 *dst, u32 ratemask,
1068                                           const u8 *ssid, size_t ssid_len,
1069                                           const u8 *ie, size_t ie_len,
1070                                           bool directed)
1071 {
1072         struct ieee80211_local *local = sdata->local;
1073         struct sk_buff *skb;
1074         struct ieee80211_mgmt *mgmt;
1075         size_t buf_len;
1076         u8 *buf;
1077         u8 chan;
1078
1079         /* FIXME: come up with a proper value */
1080         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1081         if (!buf)
1082                 return NULL;
1083
1084         /*
1085          * Do not send DS Channel parameter for directed probe requests
1086          * in order to maximize the chance that we get a response.  Some
1087          * badly-behaved APs don't respond when this parameter is included.
1088          */
1089         if (directed)
1090                 chan = 0;
1091         else
1092                 chan = ieee80211_frequency_to_channel(
1093                         local->hw.conf.channel->center_freq);
1094
1095         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1096                                            local->hw.conf.channel->band,
1097                                            ratemask, chan);
1098
1099         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1100                                      ssid, ssid_len,
1101                                      buf, buf_len);
1102         if (!skb)
1103                 goto out;
1104
1105         if (dst) {
1106                 mgmt = (struct ieee80211_mgmt *) skb->data;
1107                 memcpy(mgmt->da, dst, ETH_ALEN);
1108                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1109         }
1110
1111         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1112
1113  out:
1114         kfree(buf);
1115
1116         return skb;
1117 }
1118
1119 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1120                               const u8 *ssid, size_t ssid_len,
1121                               const u8 *ie, size_t ie_len,
1122                               u32 ratemask, bool directed, bool no_cck)
1123 {
1124         struct sk_buff *skb;
1125
1126         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1127                                         ie, ie_len, directed);
1128         if (skb) {
1129                 if (no_cck)
1130                         IEEE80211_SKB_CB(skb)->flags |=
1131                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1132                 ieee80211_tx_skb(sdata, skb);
1133         }
1134 }
1135
1136 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1137                             struct ieee802_11_elems *elems,
1138                             enum ieee80211_band band, u32 *basic_rates)
1139 {
1140         struct ieee80211_supported_band *sband;
1141         struct ieee80211_rate *bitrates;
1142         size_t num_rates;
1143         u32 supp_rates;
1144         int i, j;
1145         sband = local->hw.wiphy->bands[band];
1146
1147         if (WARN_ON(!sband))
1148                 return 1;
1149
1150         bitrates = sband->bitrates;
1151         num_rates = sband->n_bitrates;
1152         supp_rates = 0;
1153         for (i = 0; i < elems->supp_rates_len +
1154                      elems->ext_supp_rates_len; i++) {
1155                 u8 rate = 0;
1156                 int own_rate;
1157                 bool is_basic;
1158                 if (i < elems->supp_rates_len)
1159                         rate = elems->supp_rates[i];
1160                 else if (elems->ext_supp_rates)
1161                         rate = elems->ext_supp_rates
1162                                 [i - elems->supp_rates_len];
1163                 own_rate = 5 * (rate & 0x7f);
1164                 is_basic = !!(rate & 0x80);
1165
1166                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1167                         continue;
1168
1169                 for (j = 0; j < num_rates; j++) {
1170                         if (bitrates[j].bitrate == own_rate) {
1171                                 supp_rates |= BIT(j);
1172                                 if (basic_rates && is_basic)
1173                                         *basic_rates |= BIT(j);
1174                         }
1175                 }
1176         }
1177         return supp_rates;
1178 }
1179
1180 void ieee80211_stop_device(struct ieee80211_local *local)
1181 {
1182         ieee80211_led_radio(local, false);
1183         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1184
1185         cancel_work_sync(&local->reconfig_filter);
1186
1187         flush_workqueue(local->workqueue);
1188         drv_stop(local);
1189 }
1190
1191 int ieee80211_reconfig(struct ieee80211_local *local)
1192 {
1193         struct ieee80211_hw *hw = &local->hw;
1194         struct ieee80211_sub_if_data *sdata;
1195         struct sta_info *sta;
1196         int res, i;
1197
1198 #ifdef CONFIG_PM
1199         if (local->suspended)
1200                 local->resuming = true;
1201
1202         if (local->wowlan) {
1203                 local->wowlan = false;
1204                 res = drv_resume(local);
1205                 if (res < 0) {
1206                         local->resuming = false;
1207                         return res;
1208                 }
1209                 if (res == 0)
1210                         goto wake_up;
1211                 WARN_ON(res > 1);
1212                 /*
1213                  * res is 1, which means the driver requested
1214                  * to go through a regular reset on wakeup.
1215                  */
1216         }
1217 #endif
1218         /* everything else happens only if HW was up & running */
1219         if (!local->open_count)
1220                 goto wake_up;
1221
1222         /*
1223          * Upon resume hardware can sometimes be goofy due to
1224          * various platform / driver / bus issues, so restarting
1225          * the device may at times not work immediately. Propagate
1226          * the error.
1227          */
1228         res = drv_start(local);
1229         if (res) {
1230                 WARN(local->suspended, "Hardware became unavailable "
1231                      "upon resume. This could be a software issue "
1232                      "prior to suspend or a hardware issue.\n");
1233                 return res;
1234         }
1235
1236         /* setup fragmentation threshold */
1237         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1238
1239         /* setup RTS threshold */
1240         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1241
1242         /* reset coverage class */
1243         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1244
1245         ieee80211_led_radio(local, true);
1246         ieee80211_mod_tpt_led_trig(local,
1247                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1248
1249         /* add interfaces */
1250         sdata = rtnl_dereference(local->monitor_sdata);
1251         if (sdata) {
1252                 res = drv_add_interface(local, sdata);
1253                 if (WARN_ON(res)) {
1254                         rcu_assign_pointer(local->monitor_sdata, NULL);
1255                         synchronize_net();
1256                         kfree(sdata);
1257                 }
1258         }
1259
1260         list_for_each_entry(sdata, &local->interfaces, list) {
1261                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1262                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1263                     ieee80211_sdata_running(sdata))
1264                         res = drv_add_interface(local, sdata);
1265         }
1266
1267         /* add STAs back */
1268         mutex_lock(&local->sta_mtx);
1269         list_for_each_entry(sta, &local->sta_list, list) {
1270                 if (sta->uploaded) {
1271                         enum ieee80211_sta_state state;
1272
1273                         for (state = IEEE80211_STA_NOTEXIST;
1274                              state < sta->sta_state - 1; state++)
1275                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
1276                                                       state, state + 1));
1277                 }
1278         }
1279         mutex_unlock(&local->sta_mtx);
1280
1281         /* reconfigure tx conf */
1282         if (hw->queues >= IEEE80211_NUM_ACS) {
1283                 list_for_each_entry(sdata, &local->interfaces, list) {
1284                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1285                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1286                             !ieee80211_sdata_running(sdata))
1287                                 continue;
1288
1289                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1290                                 drv_conf_tx(local, sdata, i,
1291                                             &sdata->tx_conf[i]);
1292                 }
1293         }
1294
1295         /* reconfigure hardware */
1296         ieee80211_hw_config(local, ~0);
1297
1298         ieee80211_configure_filter(local);
1299
1300         /* Finally also reconfigure all the BSS information */
1301         list_for_each_entry(sdata, &local->interfaces, list) {
1302                 u32 changed;
1303
1304                 if (!ieee80211_sdata_running(sdata))
1305                         continue;
1306
1307                 /* common change flags for all interface types */
1308                 changed = BSS_CHANGED_ERP_CTS_PROT |
1309                           BSS_CHANGED_ERP_PREAMBLE |
1310                           BSS_CHANGED_ERP_SLOT |
1311                           BSS_CHANGED_HT |
1312                           BSS_CHANGED_BASIC_RATES |
1313                           BSS_CHANGED_BEACON_INT |
1314                           BSS_CHANGED_BSSID |
1315                           BSS_CHANGED_CQM |
1316                           BSS_CHANGED_QOS |
1317                           BSS_CHANGED_IDLE;
1318
1319                 switch (sdata->vif.type) {
1320                 case NL80211_IFTYPE_STATION:
1321                         changed |= BSS_CHANGED_ASSOC |
1322                                    BSS_CHANGED_ARP_FILTER;
1323                         mutex_lock(&sdata->u.mgd.mtx);
1324                         ieee80211_bss_info_change_notify(sdata, changed);
1325                         mutex_unlock(&sdata->u.mgd.mtx);
1326                         break;
1327                 case NL80211_IFTYPE_ADHOC:
1328                         changed |= BSS_CHANGED_IBSS;
1329                         /* fall through */
1330                 case NL80211_IFTYPE_AP:
1331                         changed |= BSS_CHANGED_SSID;
1332
1333                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1334                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1335
1336                         /* fall through */
1337                 case NL80211_IFTYPE_MESH_POINT:
1338                         changed |= BSS_CHANGED_BEACON |
1339                                    BSS_CHANGED_BEACON_ENABLED;
1340                         ieee80211_bss_info_change_notify(sdata, changed);
1341                         break;
1342                 case NL80211_IFTYPE_WDS:
1343                         break;
1344                 case NL80211_IFTYPE_AP_VLAN:
1345                 case NL80211_IFTYPE_MONITOR:
1346                         /* ignore virtual */
1347                         break;
1348                 case NL80211_IFTYPE_UNSPECIFIED:
1349                 case NUM_NL80211_IFTYPES:
1350                 case NL80211_IFTYPE_P2P_CLIENT:
1351                 case NL80211_IFTYPE_P2P_GO:
1352                         WARN_ON(1);
1353                         break;
1354                 }
1355         }
1356
1357         ieee80211_recalc_ps(local, -1);
1358
1359         /*
1360          * The sta might be in psm against the ap (e.g. because
1361          * this was the state before a hw restart), so we
1362          * explicitly send a null packet in order to make sure
1363          * it'll sync against the ap (and get out of psm).
1364          */
1365         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1366                 list_for_each_entry(sdata, &local->interfaces, list) {
1367                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1368                                 continue;
1369
1370                         ieee80211_send_nullfunc(local, sdata, 0);
1371                 }
1372         }
1373
1374         /* add back keys */
1375         list_for_each_entry(sdata, &local->interfaces, list)
1376                 if (ieee80211_sdata_running(sdata))
1377                         ieee80211_enable_keys(sdata);
1378
1379  wake_up:
1380         /*
1381          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1382          * sessions can be established after a resume.
1383          *
1384          * Also tear down aggregation sessions since reconfiguring
1385          * them in a hardware restart scenario is not easily done
1386          * right now, and the hardware will have lost information
1387          * about the sessions, but we and the AP still think they
1388          * are active. This is really a workaround though.
1389          */
1390         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1391                 mutex_lock(&local->sta_mtx);
1392
1393                 list_for_each_entry(sta, &local->sta_list, list) {
1394                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1395                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1396                 }
1397
1398                 mutex_unlock(&local->sta_mtx);
1399         }
1400
1401         ieee80211_wake_queues_by_reason(hw,
1402                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1403
1404         /*
1405          * If this is for hw restart things are still running.
1406          * We may want to change that later, however.
1407          */
1408         if (!local->suspended)
1409                 return 0;
1410
1411 #ifdef CONFIG_PM
1412         /* first set suspended false, then resuming */
1413         local->suspended = false;
1414         mb();
1415         local->resuming = false;
1416
1417         list_for_each_entry(sdata, &local->interfaces, list) {
1418                 switch(sdata->vif.type) {
1419                 case NL80211_IFTYPE_STATION:
1420                         ieee80211_sta_restart(sdata);
1421                         break;
1422                 case NL80211_IFTYPE_ADHOC:
1423                         ieee80211_ibss_restart(sdata);
1424                         break;
1425                 case NL80211_IFTYPE_MESH_POINT:
1426                         ieee80211_mesh_restart(sdata);
1427                         break;
1428                 default:
1429                         break;
1430                 }
1431         }
1432
1433         mod_timer(&local->sta_cleanup, jiffies + 1);
1434
1435         mutex_lock(&local->sta_mtx);
1436         list_for_each_entry(sta, &local->sta_list, list)
1437                 mesh_plink_restart(sta);
1438         mutex_unlock(&local->sta_mtx);
1439 #else
1440         WARN_ON(1);
1441 #endif
1442         return 0;
1443 }
1444
1445 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1446 {
1447         struct ieee80211_sub_if_data *sdata;
1448         struct ieee80211_local *local;
1449         struct ieee80211_key *key;
1450
1451         if (WARN_ON(!vif))
1452                 return;
1453
1454         sdata = vif_to_sdata(vif);
1455         local = sdata->local;
1456
1457         if (WARN_ON(!local->resuming))
1458                 return;
1459
1460         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1461                 return;
1462
1463         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1464
1465         mutex_lock(&local->key_mtx);
1466         list_for_each_entry(key, &sdata->key_list, list)
1467                 key->flags |= KEY_FLAG_TAINTED;
1468         mutex_unlock(&local->key_mtx);
1469 }
1470 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1471
1472 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1473                           enum ieee80211_smps_mode *smps_mode)
1474 {
1475         if (ifmgd->associated) {
1476                 *smps_mode = ifmgd->ap_smps;
1477
1478                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1479                         if (ifmgd->powersave)
1480                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1481                         else
1482                                 *smps_mode = IEEE80211_SMPS_OFF;
1483                 }
1484
1485                 return 1;
1486         }
1487
1488         return 0;
1489 }
1490
1491 /* must hold iflist_mtx */
1492 void ieee80211_recalc_smps(struct ieee80211_local *local)
1493 {
1494         struct ieee80211_sub_if_data *sdata;
1495         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1496         int count = 0;
1497
1498         lockdep_assert_held(&local->iflist_mtx);
1499
1500         /*
1501          * This function could be improved to handle multiple
1502          * interfaces better, but right now it makes any
1503          * non-station interfaces force SM PS to be turned
1504          * off. If there are multiple station interfaces it
1505          * could also use the best possible mode, e.g. if
1506          * one is in static and the other in dynamic then
1507          * dynamic is ok.
1508          */
1509
1510         list_for_each_entry(sdata, &local->interfaces, list) {
1511                 if (!ieee80211_sdata_running(sdata))
1512                         continue;
1513                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1514                         goto set;
1515
1516                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1517
1518                 if (count > 1) {
1519                         smps_mode = IEEE80211_SMPS_OFF;
1520                         break;
1521                 }
1522         }
1523
1524         if (smps_mode == local->smps_mode)
1525                 return;
1526
1527  set:
1528         local->smps_mode = smps_mode;
1529         /* changed flag is auto-detected for this */
1530         ieee80211_hw_config(local, 0);
1531 }
1532
1533 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1534 {
1535         int i;
1536
1537         for (i = 0; i < n_ids; i++)
1538                 if (ids[i] == id)
1539                         return true;
1540         return false;
1541 }
1542
1543 /**
1544  * ieee80211_ie_split - split an IE buffer according to ordering
1545  *
1546  * @ies: the IE buffer
1547  * @ielen: the length of the IE buffer
1548  * @ids: an array with element IDs that are allowed before
1549  *      the split
1550  * @n_ids: the size of the element ID array
1551  * @offset: offset where to start splitting in the buffer
1552  *
1553  * This function splits an IE buffer by updating the @offset
1554  * variable to point to the location where the buffer should be
1555  * split.
1556  *
1557  * It assumes that the given IE buffer is well-formed, this
1558  * has to be guaranteed by the caller!
1559  *
1560  * It also assumes that the IEs in the buffer are ordered
1561  * correctly, if not the result of using this function will not
1562  * be ordered correctly either, i.e. it does no reordering.
1563  *
1564  * The function returns the offset where the next part of the
1565  * buffer starts, which may be @ielen if the entire (remainder)
1566  * of the buffer should be used.
1567  */
1568 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1569                           const u8 *ids, int n_ids, size_t offset)
1570 {
1571         size_t pos = offset;
1572
1573         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1574                 pos += 2 + ies[pos + 1];
1575
1576         return pos;
1577 }
1578
1579 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1580 {
1581         size_t pos = offset;
1582
1583         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1584                 pos += 2 + ies[pos + 1];
1585
1586         return pos;
1587 }
1588
1589 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1590                                             int rssi_min_thold,
1591                                             int rssi_max_thold)
1592 {
1593         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1594
1595         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1596                 return;
1597
1598         /*
1599          * Scale up threshold values before storing it, as the RSSI averaging
1600          * algorithm uses a scaled up value as well. Change this scaling
1601          * factor if the RSSI averaging algorithm changes.
1602          */
1603         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1604         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1605 }
1606
1607 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1608                                     int rssi_min_thold,
1609                                     int rssi_max_thold)
1610 {
1611         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1612
1613         WARN_ON(rssi_min_thold == rssi_max_thold ||
1614                 rssi_min_thold > rssi_max_thold);
1615
1616         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1617                                        rssi_max_thold);
1618 }
1619 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1620
1621 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1622 {
1623         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1624
1625         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1626 }
1627 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1628
1629 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1630                               u16 cap)
1631 {
1632         __le16 tmp;
1633
1634         *pos++ = WLAN_EID_HT_CAPABILITY;
1635         *pos++ = sizeof(struct ieee80211_ht_cap);
1636         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1637
1638         /* capability flags */
1639         tmp = cpu_to_le16(cap);
1640         memcpy(pos, &tmp, sizeof(u16));
1641         pos += sizeof(u16);
1642
1643         /* AMPDU parameters */
1644         *pos++ = ht_cap->ampdu_factor |
1645                  (ht_cap->ampdu_density <<
1646                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1647
1648         /* MCS set */
1649         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1650         pos += sizeof(ht_cap->mcs);
1651
1652         /* extended capabilities */
1653         pos += sizeof(__le16);
1654
1655         /* BF capabilities */
1656         pos += sizeof(__le32);
1657
1658         /* antenna selection */
1659         pos += sizeof(u8);
1660
1661         return pos;
1662 }
1663
1664 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1665                                struct ieee80211_channel *channel,
1666                                enum nl80211_channel_type channel_type,
1667                                u16 prot_mode)
1668 {
1669         struct ieee80211_ht_operation *ht_oper;
1670         /* Build HT Information */
1671         *pos++ = WLAN_EID_HT_OPERATION;
1672         *pos++ = sizeof(struct ieee80211_ht_operation);
1673         ht_oper = (struct ieee80211_ht_operation *)pos;
1674         ht_oper->primary_chan =
1675                         ieee80211_frequency_to_channel(channel->center_freq);
1676         switch (channel_type) {
1677         case NL80211_CHAN_HT40MINUS:
1678                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1679                 break;
1680         case NL80211_CHAN_HT40PLUS:
1681                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1682                 break;
1683         case NL80211_CHAN_HT20:
1684         default:
1685                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1686                 break;
1687         }
1688         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1689             channel_type != NL80211_CHAN_NO_HT &&
1690             channel_type != NL80211_CHAN_HT20)
1691                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1692
1693         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1694         ht_oper->stbc_param = 0x0000;
1695
1696         /* It seems that Basic MCS set and Supported MCS set
1697            are identical for the first 10 bytes */
1698         memset(&ht_oper->basic_set, 0, 16);
1699         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1700
1701         return pos + sizeof(struct ieee80211_ht_operation);
1702 }
1703
1704 enum nl80211_channel_type
1705 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1706 {
1707         enum nl80211_channel_type channel_type;
1708
1709         if (!ht_oper)
1710                 return NL80211_CHAN_NO_HT;
1711
1712         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1713         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1714                 channel_type = NL80211_CHAN_HT20;
1715                 break;
1716         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1717                 channel_type = NL80211_CHAN_HT40PLUS;
1718                 break;
1719         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1720                 channel_type = NL80211_CHAN_HT40MINUS;
1721                 break;
1722         default:
1723                 channel_type = NL80211_CHAN_NO_HT;
1724         }
1725
1726         return channel_type;
1727 }
1728
1729 int ieee80211_add_srates_ie(struct ieee80211_vif *vif,
1730                             struct sk_buff *skb, bool need_basic)
1731 {
1732         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1733         struct ieee80211_local *local = sdata->local;
1734         struct ieee80211_supported_band *sband;
1735         int rate;
1736         u8 i, rates, *pos;
1737         u32 basic_rates = vif->bss_conf.basic_rates;
1738
1739         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1740         rates = sband->n_bitrates;
1741         if (rates > 8)
1742                 rates = 8;
1743
1744         if (skb_tailroom(skb) < rates + 2)
1745                 return -ENOMEM;
1746
1747         pos = skb_put(skb, rates + 2);
1748         *pos++ = WLAN_EID_SUPP_RATES;
1749         *pos++ = rates;
1750         for (i = 0; i < rates; i++) {
1751                 u8 basic = 0;
1752                 if (need_basic && basic_rates & BIT(i))
1753                         basic = 0x80;
1754                 rate = sband->bitrates[i].bitrate;
1755                 *pos++ = basic | (u8) (rate / 5);
1756         }
1757
1758         return 0;
1759 }
1760
1761 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif,
1762                                 struct sk_buff *skb, bool need_basic)
1763 {
1764         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1765         struct ieee80211_local *local = sdata->local;
1766         struct ieee80211_supported_band *sband;
1767         int rate;
1768         u8 i, exrates, *pos;
1769         u32 basic_rates = vif->bss_conf.basic_rates;
1770
1771         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1772         exrates = sband->n_bitrates;
1773         if (exrates > 8)
1774                 exrates -= 8;
1775         else
1776                 exrates = 0;
1777
1778         if (skb_tailroom(skb) < exrates + 2)
1779                 return -ENOMEM;
1780
1781         if (exrates) {
1782                 pos = skb_put(skb, exrates + 2);
1783                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1784                 *pos++ = exrates;
1785                 for (i = 8; i < sband->n_bitrates; i++) {
1786                         u8 basic = 0;
1787                         if (need_basic && basic_rates & BIT(i))
1788                                 basic = 0x80;
1789                         rate = sband->bitrates[i].bitrate;
1790                         *pos++ = basic | (u8) (rate / 5);
1791                 }
1792         }
1793         return 0;
1794 }
1795
1796 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1797 {
1798         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1799         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1800
1801         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1802                 /* non-managed type inferfaces */
1803                 return 0;
1804         }
1805         return ifmgd->ave_beacon_signal;
1806 }
1807 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);