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         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 280                 return;
 281
 282         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 283
 284         if (local->queue_stop_reasons[queue] != 0)
 285                 /* someone still has this queue stopped */
 286                 return;
 287
 288         if (skb_queue_empty(&local->pending[queue])) {
 289                 rcu_read_lock();
 290                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 291                         if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 292                                 continue;
 293                         netif_wake_subqueue(sdata->dev, queue);
 294                 }
 295                 rcu_read_unlock();
 296         } else
 297                 tasklet_schedule(&local->tx_pending_tasklet);
 298 }
 299
 300 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 301                                     enum queue_stop_reason reason)
 302 {
 303         struct ieee80211_local *local = hw_to_local(hw);
 304         unsigned long flags;
 305
 306         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 307         __ieee80211_wake_queue(hw, queue, reason);
 308         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 309 }
 310
 311 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 312 {
 313         ieee80211_wake_queue_by_reason(hw, queue,
 314                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 315 }
 316 EXPORT_SYMBOL(ieee80211_wake_queue);
 317
 318 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 319                                    enum queue_stop_reason reason)
 320 {
 321         struct ieee80211_local *local = hw_to_local(hw);
 322         struct ieee80211_sub_if_data *sdata;
 323
 324         trace_stop_queue(local, queue, reason);
 325
 326         if (WARN_ON(queue >= hw->queues))
 327                 return;
 328
 329         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 330                 return;
 331
 332         __set_bit(reason, &local->queue_stop_reasons[queue]);
 333
 334         rcu_read_lock();
 335         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 336                 netif_stop_subqueue(sdata->dev, queue);
 337         rcu_read_unlock();
 338 }
 339
 340 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 341                                     enum queue_stop_reason reason)
 342 {
 343         struct ieee80211_local *local = hw_to_local(hw);
 344         unsigned long flags;
 345
 346         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 347         __ieee80211_stop_queue(hw, queue, reason);
 348         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 349 }
 350
 351 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 352 {
 353         ieee80211_stop_queue_by_reason(hw, queue,
 354                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 355 }
 356 EXPORT_SYMBOL(ieee80211_stop_queue);
 357
 358 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 359                                struct sk_buff *skb)
 360 {
 361         struct ieee80211_hw *hw = &local->hw;
 362         unsigned long flags;
 363         int queue = skb_get_queue_mapping(skb);
 364         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 365
 366         if (WARN_ON(!info->control.vif)) {
 367                 kfree_skb(skb);
 368                 return;
 369         }
 370
 371         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 372         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 373         __skb_queue_tail(&local->pending[queue], skb);
 374         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 375         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 376 }
 377
 378 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 379                                    struct sk_buff_head *skbs,
 380                                    void (*fn)(void *data), void *data)
 381 {
 382         struct ieee80211_hw *hw = &local->hw;
 383         struct sk_buff *skb;
 384         unsigned long flags;
 385         int queue, i;
 386
 387         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 388         while ((skb = skb_dequeue(skbs))) {
 389                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 390
 391                 if (WARN_ON(!info->control.vif)) {
 392                         kfree_skb(skb);
 393                         continue;
 394                 }
 395
 396                 queue = skb_get_queue_mapping(skb);
 397
 398                 __ieee80211_stop_queue(hw, queue,
 399                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 400
 401                 __skb_queue_tail(&local->pending[queue], skb);
 402         }
 403
 404         if (fn)
 405                 fn(data);
 406
 407         for (i = 0; i < hw->queues; i++)
 408                 __ieee80211_wake_queue(hw, i,
 409                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 410         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 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         DECLARE_BITMAP(seen_elems, 256);
 576
 577         bitmap_zero(seen_elems, 256);
 578         memset(elems, 0, sizeof(*elems));
 579         elems->ie_start = start;
 580         elems->total_len = len;
 581
 582         while (left >= 2) {
 583                 u8 id, elen;
 584                 bool elem_parse_failed;
 585
 586                 id = *pos++;
 587                 elen = *pos++;
 588                 left -= 2;
 589
 590                 if (elen > left) {
 591                         elems->parse_error = true;
 592                         break;
 593                 }
 594
 595                 if (id != WLAN_EID_VENDOR_SPECIFIC &&
 596                     id != WLAN_EID_QUIET &&
 597                     test_bit(id, seen_elems)) {
 598                         elems->parse_error = true;
 599                         left -= elen;
 600                         pos += elen;
 601                         continue;
 602                 }
 603
 604                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 605                         crc = crc32_be(crc, pos - 2, elen + 2);
 606
 607                 elem_parse_failed = false;
 608
 609                 switch (id) {
 610                 case WLAN_EID_SSID:
 611                         elems->ssid = pos;
 612                         elems->ssid_len = elen;
 613                         break;
 614                 case WLAN_EID_SUPP_RATES:
 615                         elems->supp_rates = pos;
 616                         elems->supp_rates_len = elen;
 617                         break;
 618                 case WLAN_EID_FH_PARAMS:
 619                         elems->fh_params = pos;
 620                         elems->fh_params_len = elen;
 621                         break;
 622                 case WLAN_EID_DS_PARAMS:
 623                         elems->ds_params = pos;
 624                         elems->ds_params_len = elen;
 625                         break;
 626                 case WLAN_EID_CF_PARAMS:
 627                         elems->cf_params = pos;
 628                         elems->cf_params_len = elen;
 629                         break;
 630                 case WLAN_EID_TIM:
 631                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 632                                 elems->tim = (void *)pos;
 633                                 elems->tim_len = elen;
 634                         } else
 635                                 elem_parse_failed = true;
 636                         break;
 637                 case WLAN_EID_IBSS_PARAMS:
 638                         elems->ibss_params = pos;
 639                         elems->ibss_params_len = elen;
 640                         break;
 641                 case WLAN_EID_CHALLENGE:
 642                         elems->challenge = pos;
 643                         elems->challenge_len = elen;
 644                         break;
 645                 case WLAN_EID_VENDOR_SPECIFIC:
 646                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 647                             pos[2] == 0xf2) {
 648                                 /* Microsoft OUI (00:50:F2) */
 649
 650                                 if (calc_crc)
 651                                         crc = crc32_be(crc, pos - 2, elen + 2);
 652
 653                                 if (pos[3] == 1) {
 654                                         /* OUI Type 1 - WPA IE */
 655                                         elems->wpa = pos;
 656                                         elems->wpa_len = elen;
 657                                 } else if (elen >= 5 && pos[3] == 2) {
 658                                         /* OUI Type 2 - WMM IE */
 659                                         if (pos[4] == 0) {
 660                                                 elems->wmm_info = pos;
 661                                                 elems->wmm_info_len = elen;
 662                                         } else if (pos[4] == 1) {
 663                                                 elems->wmm_param = pos;
 664                                                 elems->wmm_param_len = elen;
 665                                         }
 666                                 }
 667                         }
 668                         break;
 669                 case WLAN_EID_RSN:
 670                         elems->rsn = pos;
 671                         elems->rsn_len = elen;
 672                         break;
 673                 case WLAN_EID_ERP_INFO:
 674                         elems->erp_info = pos;
 675                         elems->erp_info_len = elen;
 676                         break;
 677                 case WLAN_EID_EXT_SUPP_RATES:
 678                         elems->ext_supp_rates = pos;
 679                         elems->ext_supp_rates_len = elen;
 680                         break;
 681                 case WLAN_EID_HT_CAPABILITY:
 682                         if (elen >= sizeof(struct ieee80211_ht_cap))
 683                                 elems->ht_cap_elem = (void *)pos;
 684                         else
 685                                 elem_parse_failed = true;
 686                         break;
 687                 case WLAN_EID_HT_OPERATION:
 688                         if (elen >= sizeof(struct ieee80211_ht_operation))
 689                                 elems->ht_operation = (void *)pos;
 690                         else
 691                                 elem_parse_failed = true;
 692                         break;
 693                 case WLAN_EID_MESH_ID:
 694                         elems->mesh_id = pos;
 695                         elems->mesh_id_len = elen;
 696                         break;
 697                 case WLAN_EID_MESH_CONFIG:
 698                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 699                                 elems->mesh_config = (void *)pos;
 700                         else
 701                                 elem_parse_failed = true;
 702                         break;
 703                 case WLAN_EID_PEER_MGMT:
 704                         elems->peering = pos;
 705                         elems->peering_len = elen;
 706                         break;
 707                 case WLAN_EID_PREQ:
 708                         elems->preq = pos;
 709                         elems->preq_len = elen;
 710                         break;
 711                 case WLAN_EID_PREP:
 712                         elems->prep = pos;
 713                         elems->prep_len = elen;
 714                         break;
 715                 case WLAN_EID_PERR:
 716                         elems->perr = pos;
 717                         elems->perr_len = elen;
 718                         break;
 719                 case WLAN_EID_RANN:
 720                         if (elen >= sizeof(struct ieee80211_rann_ie))
 721                                 elems->rann = (void *)pos;
 722                         else
 723                                 elem_parse_failed = true;
 724                         break;
 725                 case WLAN_EID_CHANNEL_SWITCH:
 726                         elems->ch_switch_elem = pos;
 727                         elems->ch_switch_elem_len = elen;
 728                         break;
 729                 case WLAN_EID_QUIET:
 730                         if (!elems->quiet_elem) {
 731                                 elems->quiet_elem = pos;
 732                                 elems->quiet_elem_len = elen;
 733                         }
 734                         elems->num_of_quiet_elem++;
 735                         break;
 736                 case WLAN_EID_COUNTRY:
 737                         elems->country_elem = pos;
 738                         elems->country_elem_len = elen;
 739                         break;
 740                 case WLAN_EID_PWR_CONSTRAINT:
 741                         elems->pwr_constr_elem = pos;
 742                         elems->pwr_constr_elem_len = elen;
 743                         break;
 744                 case WLAN_EID_TIMEOUT_INTERVAL:
 745                         elems->timeout_int = pos;
 746                         elems->timeout_int_len = elen;
 747                         break;
 748                 default:
 749                         break;
 750                 }
 751
 752                 if (elem_parse_failed)
 753                         elems->parse_error = true;
 754                 else
 755                         set_bit(id, seen_elems);
 756
 757                 left -= elen;
 758                 pos += elen;
 759         }
 760
 761         if (left != 0)
 762                 elems->parse_error = true;
 763
 764         return crc;
 765 }
 766
 767 void ieee802_11_parse_elems(u8 *start, size_t len,
 768                             struct ieee802_11_elems *elems)
 769 {
 770         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 771 }
 772
 773 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 774                                bool bss_notify)
 775 {
 776         struct ieee80211_local *local = sdata->local;
 777         struct ieee80211_tx_queue_params qparam;
 778         int ac;
 779         bool use_11b;
 780         int aCWmin, aCWmax;
 781
 782         if (!local->ops->conf_tx)
 783                 return;
 784
 785         if (local->hw.queues < IEEE80211_NUM_ACS)
 786                 return;
 787
 788         memset(&qparam, 0, sizeof(qparam));
 789
 790         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 791                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 792
 793         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 794                 /* Set defaults according to 802.11-2007 Table 7-37 */
 795                 aCWmax = 1023;
 796                 if (use_11b)
 797                         aCWmin = 31;
 798                 else
 799                         aCWmin = 15;
 800
 801                 switch (ac) {
 802                 case IEEE80211_AC_BK:
 803                         qparam.cw_max = aCWmax;
 804                         qparam.cw_min = aCWmin;
 805                         qparam.txop = 0;
 806                         qparam.aifs = 7;
 807                         break;
 808                 default: /* never happens but let's not leave undefined */
 809                 case IEEE80211_AC_BE:
 810                         qparam.cw_max = aCWmax;
 811                         qparam.cw_min = aCWmin;
 812                         qparam.txop = 0;
 813                         qparam.aifs = 3;
 814                         break;
 815                 case IEEE80211_AC_VI:
 816                         qparam.cw_max = aCWmin;
 817                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 818                         if (use_11b)
 819                                 qparam.txop = 6016/32;
 820                         else
 821                                 qparam.txop = 3008/32;
 822                         qparam.aifs = 2;
 823                         break;
 824                 case IEEE80211_AC_VO:
 825                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 826                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 827                         if (use_11b)
 828                                 qparam.txop = 3264/32;
 829                         else
 830                                 qparam.txop = 1504/32;
 831                         qparam.aifs = 2;
 832                         break;
 833                 }
 834
 835                 qparam.uapsd = false;
 836
 837                 sdata->tx_conf[ac] = qparam;
 838                 drv_conf_tx(local, sdata, ac, &qparam);
 839         }
 840
 841         /* after reinitialize QoS TX queues setting to default,
 842          * disable QoS at all */
 843
 844         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 845                 sdata->vif.bss_conf.qos =
 846                         sdata->vif.type != NL80211_IFTYPE_STATION;
 847                 if (bss_notify)
 848                         ieee80211_bss_info_change_notify(sdata,
 849                                                          BSS_CHANGED_QOS);
 850         }
 851 }
 852
 853 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 854                                   const size_t supp_rates_len,
 855                                   const u8 *supp_rates)
 856 {
 857         struct ieee80211_local *local = sdata->local;
 858         int i, have_higher_than_11mbit = 0;
 859
 860         /* cf. IEEE 802.11 9.2.12 */
 861         for (i = 0; i < supp_rates_len; i++)
 862                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 863                         have_higher_than_11mbit = 1;
 864
 865         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 866             have_higher_than_11mbit)
 867                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 868         else
 869                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 870
 871         ieee80211_set_wmm_default(sdata, true);
 872 }
 873
 874 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 875                               enum ieee80211_band band)
 876 {
 877         struct ieee80211_supported_band *sband;
 878         struct ieee80211_rate *bitrates;
 879         u32 mandatory_rates;
 880         enum ieee80211_rate_flags mandatory_flag;
 881         int i;
 882
 883         sband = local->hw.wiphy->bands[band];
 884         if (!sband) {
 885                 WARN_ON(1);
 886                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 887         }
 888
 889         if (band == IEEE80211_BAND_2GHZ)
 890                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 891         else
 892                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 893
 894         bitrates = sband->bitrates;
 895         mandatory_rates = 0;
 896         for (i = 0; i < sband->n_bitrates; i++)
 897                 if (bitrates[i].flags & mandatory_flag)
 898                         mandatory_rates |= BIT(i);
 899         return mandatory_rates;
 900 }
 901
 902 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 903                          u16 transaction, u16 auth_alg,
 904                          u8 *extra, size_t extra_len, const u8 *da,
 905                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 906 {
 907         struct ieee80211_local *local = sdata->local;
 908         struct sk_buff *skb;
 909         struct ieee80211_mgmt *mgmt;
 910         int err;
 911
 912         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 913                             sizeof(*mgmt) + 6 + extra_len);
 914         if (!skb)
 915                 return;
 916
 917         skb_reserve(skb, local->hw.extra_tx_headroom);
 918
 919         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 920         memset(mgmt, 0, 24 + 6);
 921         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 922                                           IEEE80211_STYPE_AUTH);
 923         memcpy(mgmt->da, da, ETH_ALEN);
 924         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 925         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 926         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 927         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 928         mgmt->u.auth.status_code = cpu_to_le16(0);
 929         if (extra)
 930                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 931
 932         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 933                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 934                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 935                 WARN_ON(err);
 936         }
 937
 938         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 939         ieee80211_tx_skb(sdata, skb);
 940 }
 941
 942 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 943                              const u8 *ie, size_t ie_len,
 944                              enum ieee80211_band band, u32 rate_mask,
 945                              u8 channel)
 946 {
 947         struct ieee80211_supported_band *sband;
 948         u8 *pos;
 949         size_t offset = 0, noffset;
 950         int supp_rates_len, i;
 951         u8 rates[32];
 952         int num_rates;
 953         int ext_rates_len;
 954
 955         sband = local->hw.wiphy->bands[band];
 956
 957         pos = buffer;
 958
 959         num_rates = 0;
 960         for (i = 0; i < sband->n_bitrates; i++) {
 961                 if ((BIT(i) & rate_mask) == 0)
 962                         continue; /* skip rate */
 963                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
 964         }
 965
 966         supp_rates_len = min_t(int, num_rates, 8);
 967
 968         *pos++ = WLAN_EID_SUPP_RATES;
 969         *pos++ = supp_rates_len;
 970         memcpy(pos, rates, supp_rates_len);
 971         pos += supp_rates_len;
 972
 973         /* insert "request information" if in custom IEs */
 974         if (ie && ie_len) {
 975                 static const u8 before_extrates[] = {
 976                         WLAN_EID_SSID,
 977                         WLAN_EID_SUPP_RATES,
 978                         WLAN_EID_REQUEST,
 979                 };
 980                 noffset = ieee80211_ie_split(ie, ie_len,
 981                                              before_extrates,
 982                                              ARRAY_SIZE(before_extrates),
 983                                              offset);
 984                 memcpy(pos, ie + offset, noffset - offset);
 985                 pos += noffset - offset;
 986                 offset = noffset;
 987         }
 988
 989         ext_rates_len = num_rates - supp_rates_len;
 990         if (ext_rates_len > 0) {
 991                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 992                 *pos++ = ext_rates_len;
 993                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
 994                 pos += ext_rates_len;
 995         }
 996
 997         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
 998                 *pos++ = WLAN_EID_DS_PARAMS;
 999                 *pos++ = 1;
1000                 *pos++ = channel;
1001         }
1002
1003         /* insert custom IEs that go before HT */
1004         if (ie && ie_len) {
1005                 static const u8 before_ht[] = {
1006                         WLAN_EID_SSID,
1007                         WLAN_EID_SUPP_RATES,
1008                         WLAN_EID_REQUEST,
1009                         WLAN_EID_EXT_SUPP_RATES,
1010                         WLAN_EID_DS_PARAMS,
1011                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1012                 };
1013                 noffset = ieee80211_ie_split(ie, ie_len,
1014                                              before_ht, ARRAY_SIZE(before_ht),
1015                                              offset);
1016                 memcpy(pos, ie + offset, noffset - offset);
1017                 pos += noffset - offset;
1018                 offset = noffset;
1019         }
1020
1021         if (sband->ht_cap.ht_supported)
1022                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1023                                                 sband->ht_cap.cap);
1024
1025         /*
1026          * If adding more here, adjust code in main.c
1027          * that calculates local->scan_ies_len.
1028          */
1029
1030         /* add any remaining custom IEs */
1031         if (ie && ie_len) {
1032                 noffset = ie_len;
1033                 memcpy(pos, ie + offset, noffset - offset);
1034                 pos += noffset - offset;
1035         }
1036
1037         return pos - buffer;
1038 }
1039
1040 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1041                                           u8 *dst, u32 ratemask,
1042                                           const u8 *ssid, size_t ssid_len,
1043                                           const u8 *ie, size_t ie_len,
1044                                           bool directed)
1045 {
1046         struct ieee80211_local *local = sdata->local;
1047         struct sk_buff *skb;
1048         struct ieee80211_mgmt *mgmt;
1049         size_t buf_len;
1050         u8 *buf;
1051         u8 chan;
1052
1053         /* FIXME: come up with a proper value */
1054         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1055         if (!buf)
1056                 return NULL;
1057
1058         /*
1059          * Do not send DS Channel parameter for directed probe requests
1060          * in order to maximize the chance that we get a response.  Some
1061          * badly-behaved APs don't respond when this parameter is included.
1062          */
1063         if (directed)
1064                 chan = 0;
1065         else
1066                 chan = ieee80211_frequency_to_channel(
1067                         local->hw.conf.channel->center_freq);
1068
1069         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1070                                            local->hw.conf.channel->band,
1071                                            ratemask, chan);
1072
1073         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1074                                      ssid, ssid_len,
1075                                      buf, buf_len);
1076         if (!skb)
1077                 goto out;
1078
1079         if (dst) {
1080                 mgmt = (struct ieee80211_mgmt *) skb->data;
1081                 memcpy(mgmt->da, dst, ETH_ALEN);
1082                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1083         }
1084
1085         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1086
1087  out:
1088         kfree(buf);
1089
1090         return skb;
1091 }
1092
1093 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1094                               const u8 *ssid, size_t ssid_len,
1095                               const u8 *ie, size_t ie_len,
1096                               u32 ratemask, bool directed, bool no_cck)
1097 {
1098         struct sk_buff *skb;
1099
1100         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1101                                         ie, ie_len, directed);
1102         if (skb) {
1103                 if (no_cck)
1104                         IEEE80211_SKB_CB(skb)->flags |=
1105                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1106                 ieee80211_tx_skb(sdata, skb);
1107         }
1108 }
1109
1110 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1111                             struct ieee802_11_elems *elems,
1112                             enum ieee80211_band band, u32 *basic_rates)
1113 {
1114         struct ieee80211_supported_band *sband;
1115         struct ieee80211_rate *bitrates;
1116         size_t num_rates;
1117         u32 supp_rates;
1118         int i, j;
1119         sband = local->hw.wiphy->bands[band];
1120
1121         if (!sband) {
1122                 WARN_ON(1);
1123                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1124         }
1125
1126         bitrates = sband->bitrates;
1127         num_rates = sband->n_bitrates;
1128         supp_rates = 0;
1129         for (i = 0; i < elems->supp_rates_len +
1130                      elems->ext_supp_rates_len; i++) {
1131                 u8 rate = 0;
1132                 int own_rate;
1133                 bool is_basic;
1134                 if (i < elems->supp_rates_len)
1135                         rate = elems->supp_rates[i];
1136                 else if (elems->ext_supp_rates)
1137                         rate = elems->ext_supp_rates
1138                                 [i - elems->supp_rates_len];
1139                 own_rate = 5 * (rate & 0x7f);
1140                 is_basic = !!(rate & 0x80);
1141
1142                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1143                         continue;
1144
1145                 for (j = 0; j < num_rates; j++) {
1146                         if (bitrates[j].bitrate == own_rate) {
1147                                 supp_rates |= BIT(j);
1148                                 if (basic_rates && is_basic)
1149                                         *basic_rates |= BIT(j);
1150                         }
1151                 }
1152         }
1153         return supp_rates;
1154 }
1155
1156 void ieee80211_stop_device(struct ieee80211_local *local)
1157 {
1158         ieee80211_led_radio(local, false);
1159         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1160
1161         cancel_work_sync(&local->reconfig_filter);
1162
1163         flush_workqueue(local->workqueue);
1164         drv_stop(local);
1165 }
1166
1167 int ieee80211_reconfig(struct ieee80211_local *local)
1168 {
1169         struct ieee80211_hw *hw = &local->hw;
1170         struct ieee80211_sub_if_data *sdata;
1171         struct sta_info *sta;
1172         int res, i;
1173
1174 #ifdef CONFIG_PM
1175         if (local->suspended)
1176                 local->resuming = true;
1177
1178         if (local->wowlan) {
1179                 local->wowlan = false;
1180                 res = drv_resume(local);
1181                 if (res < 0) {
1182                         local->resuming = false;
1183                         return res;
1184                 }
1185                 if (res == 0)
1186                         goto wake_up;
1187                 WARN_ON(res > 1);
1188                 /*
1189                  * res is 1, which means the driver requested
1190                  * to go through a regular reset on wakeup.
1191                  */
1192         }
1193 #endif
1194         /* everything else happens only if HW was up & running */
1195         if (!local->open_count)
1196                 goto wake_up;
1197
1198         /*
1199          * Upon resume hardware can sometimes be goofy due to
1200          * various platform / driver / bus issues, so restarting
1201          * the device may at times not work immediately. Propagate
1202          * the error.
1203          */
1204         res = drv_start(local);
1205         if (res) {
1206                 WARN(local->suspended, "Hardware became unavailable "
1207                      "upon resume. This could be a software issue "
1208                      "prior to suspend or a hardware issue.\n");
1209                 return res;
1210         }
1211
1212         /* setup fragmentation threshold */
1213         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1214
1215         /* setup RTS threshold */
1216         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1217
1218         /* reset coverage class */
1219         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1220
1221         ieee80211_led_radio(local, true);
1222         ieee80211_mod_tpt_led_trig(local,
1223                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1224
1225         /* add interfaces */
1226         list_for_each_entry(sdata, &local->interfaces, list) {
1227                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1228                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1229                     ieee80211_sdata_running(sdata))
1230                         res = drv_add_interface(local, sdata);
1231         }
1232
1233         /* add STAs back */
1234         mutex_lock(&local->sta_mtx);
1235         list_for_each_entry(sta, &local->sta_list, list) {
1236                 if (sta->uploaded) {
1237                         enum ieee80211_sta_state state;
1238
1239                         for (state = IEEE80211_STA_NOTEXIST;
1240                              state < sta->sta_state - 1; state++)
1241                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
1242                                                       state, state + 1));
1243                 }
1244         }
1245         mutex_unlock(&local->sta_mtx);
1246
1247         /* reconfigure tx conf */
1248         if (hw->queues >= IEEE80211_NUM_ACS) {
1249                 list_for_each_entry(sdata, &local->interfaces, list) {
1250                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1251                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1252                             !ieee80211_sdata_running(sdata))
1253                                 continue;
1254
1255                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1256                                 drv_conf_tx(local, sdata, i,
1257                                             &sdata->tx_conf[i]);
1258                 }
1259         }
1260
1261         /* reconfigure hardware */
1262         ieee80211_hw_config(local, ~0);
1263
1264         ieee80211_configure_filter(local);
1265
1266         /* Finally also reconfigure all the BSS information */
1267         list_for_each_entry(sdata, &local->interfaces, list) {
1268                 u32 changed;
1269
1270                 if (!ieee80211_sdata_running(sdata))
1271                         continue;
1272
1273                 /* common change flags for all interface types */
1274                 changed = BSS_CHANGED_ERP_CTS_PROT |
1275                           BSS_CHANGED_ERP_PREAMBLE |
1276                           BSS_CHANGED_ERP_SLOT |
1277                           BSS_CHANGED_HT |
1278                           BSS_CHANGED_BASIC_RATES |
1279                           BSS_CHANGED_BEACON_INT |
1280                           BSS_CHANGED_BSSID |
1281                           BSS_CHANGED_CQM |
1282                           BSS_CHANGED_QOS |
1283                           BSS_CHANGED_IDLE;
1284
1285                 switch (sdata->vif.type) {
1286                 case NL80211_IFTYPE_STATION:
1287                         changed |= BSS_CHANGED_ASSOC |
1288                                    BSS_CHANGED_ARP_FILTER;
1289                         mutex_lock(&sdata->u.mgd.mtx);
1290                         ieee80211_bss_info_change_notify(sdata, changed);
1291                         mutex_unlock(&sdata->u.mgd.mtx);
1292                         break;
1293                 case NL80211_IFTYPE_ADHOC:
1294                         changed |= BSS_CHANGED_IBSS;
1295                         /* fall through */
1296                 case NL80211_IFTYPE_AP:
1297                         changed |= BSS_CHANGED_SSID;
1298
1299                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1300                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1301
1302                         /* fall through */
1303                 case NL80211_IFTYPE_MESH_POINT:
1304                         changed |= BSS_CHANGED_BEACON |
1305                                    BSS_CHANGED_BEACON_ENABLED;
1306                         ieee80211_bss_info_change_notify(sdata, changed);
1307                         break;
1308                 case NL80211_IFTYPE_WDS:
1309                         break;
1310                 case NL80211_IFTYPE_AP_VLAN:
1311                 case NL80211_IFTYPE_MONITOR:
1312                         /* ignore virtual */
1313                         break;
1314                 case NL80211_IFTYPE_UNSPECIFIED:
1315                 case NUM_NL80211_IFTYPES:
1316                 case NL80211_IFTYPE_P2P_CLIENT:
1317                 case NL80211_IFTYPE_P2P_GO:
1318                         WARN_ON(1);
1319                         break;
1320                 }
1321         }
1322
1323         ieee80211_recalc_ps(local, -1);
1324
1325         /*
1326          * The sta might be in psm against the ap (e.g. because
1327          * this was the state before a hw restart), so we
1328          * explicitly send a null packet in order to make sure
1329          * it'll sync against the ap (and get out of psm).
1330          */
1331         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1332                 list_for_each_entry(sdata, &local->interfaces, list) {
1333                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1334                                 continue;
1335
1336                         ieee80211_send_nullfunc(local, sdata, 0);
1337                 }
1338         }
1339
1340         /*
1341          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1342          * sessions can be established after a resume.
1343          *
1344          * Also tear down aggregation sessions since reconfiguring
1345          * them in a hardware restart scenario is not easily done
1346          * right now, and the hardware will have lost information
1347          * about the sessions, but we and the AP still think they
1348          * are active. This is really a workaround though.
1349          */
1350         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1351                 mutex_lock(&local->sta_mtx);
1352
1353                 list_for_each_entry(sta, &local->sta_list, list) {
1354                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1355                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1356                 }
1357
1358                 mutex_unlock(&local->sta_mtx);
1359         }
1360
1361         /* add back keys */
1362         list_for_each_entry(sdata, &local->interfaces, list)
1363                 if (ieee80211_sdata_running(sdata))
1364                         ieee80211_enable_keys(sdata);
1365
1366  wake_up:
1367         ieee80211_wake_queues_by_reason(hw,
1368                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1369
1370         /*
1371          * If this is for hw restart things are still running.
1372          * We may want to change that later, however.
1373          */
1374         if (!local->suspended)
1375                 return 0;
1376
1377 #ifdef CONFIG_PM
1378         /* first set suspended false, then resuming */
1379         local->suspended = false;
1380         mb();
1381         local->resuming = false;
1382
1383         list_for_each_entry(sdata, &local->interfaces, list) {
1384                 switch(sdata->vif.type) {
1385                 case NL80211_IFTYPE_STATION:
1386                         ieee80211_sta_restart(sdata);
1387                         break;
1388                 case NL80211_IFTYPE_ADHOC:
1389                         ieee80211_ibss_restart(sdata);
1390                         break;
1391                 case NL80211_IFTYPE_MESH_POINT:
1392                         ieee80211_mesh_restart(sdata);
1393                         break;
1394                 default:
1395                         break;
1396                 }
1397         }
1398
1399         mod_timer(&local->sta_cleanup, jiffies + 1);
1400
1401         mutex_lock(&local->sta_mtx);
1402         list_for_each_entry(sta, &local->sta_list, list)
1403                 mesh_plink_restart(sta);
1404         mutex_unlock(&local->sta_mtx);
1405 #else
1406         WARN_ON(1);
1407 #endif
1408         return 0;
1409 }
1410
1411 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1412 {
1413         struct ieee80211_sub_if_data *sdata;
1414         struct ieee80211_local *local;
1415         struct ieee80211_key *key;
1416
1417         if (WARN_ON(!vif))
1418                 return;
1419
1420         sdata = vif_to_sdata(vif);
1421         local = sdata->local;
1422
1423         if (WARN_ON(!local->resuming))
1424                 return;
1425
1426         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1427                 return;
1428
1429         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1430
1431         mutex_lock(&local->key_mtx);
1432         list_for_each_entry(key, &sdata->key_list, list)
1433                 key->flags |= KEY_FLAG_TAINTED;
1434         mutex_unlock(&local->key_mtx);
1435 }
1436 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1437
1438 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1439                           enum ieee80211_smps_mode *smps_mode)
1440 {
1441         if (ifmgd->associated) {
1442                 *smps_mode = ifmgd->ap_smps;
1443
1444                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1445                         if (ifmgd->powersave)
1446                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1447                         else
1448                                 *smps_mode = IEEE80211_SMPS_OFF;
1449                 }
1450
1451                 return 1;
1452         }
1453
1454         return 0;
1455 }
1456
1457 /* must hold iflist_mtx */
1458 void ieee80211_recalc_smps(struct ieee80211_local *local)
1459 {
1460         struct ieee80211_sub_if_data *sdata;
1461         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1462         int count = 0;
1463
1464         lockdep_assert_held(&local->iflist_mtx);
1465
1466         /*
1467          * This function could be improved to handle multiple
1468          * interfaces better, but right now it makes any
1469          * non-station interfaces force SM PS to be turned
1470          * off. If there are multiple station interfaces it
1471          * could also use the best possible mode, e.g. if
1472          * one is in static and the other in dynamic then
1473          * dynamic is ok.
1474          */
1475
1476         list_for_each_entry(sdata, &local->interfaces, list) {
1477                 if (!ieee80211_sdata_running(sdata))
1478                         continue;
1479                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1480                         goto set;
1481
1482                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1483
1484                 if (count > 1) {
1485                         smps_mode = IEEE80211_SMPS_OFF;
1486                         break;
1487                 }
1488         }
1489
1490         if (smps_mode == local->smps_mode)
1491                 return;
1492
1493  set:
1494         local->smps_mode = smps_mode;
1495         /* changed flag is auto-detected for this */
1496         ieee80211_hw_config(local, 0);
1497 }
1498
1499 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1500 {
1501         int i;
1502
1503         for (i = 0; i < n_ids; i++)
1504                 if (ids[i] == id)
1505                         return true;
1506         return false;
1507 }
1508
1509 /**
1510  * ieee80211_ie_split - split an IE buffer according to ordering
1511  *
1512  * @ies: the IE buffer
1513  * @ielen: the length of the IE buffer
1514  * @ids: an array with element IDs that are allowed before
1515  *      the split
1516  * @n_ids: the size of the element ID array
1517  * @offset: offset where to start splitting in the buffer
1518  *
1519  * This function splits an IE buffer by updating the @offset
1520  * variable to point to the location where the buffer should be
1521  * split.
1522  *
1523  * It assumes that the given IE buffer is well-formed, this
1524  * has to be guaranteed by the caller!
1525  *
1526  * It also assumes that the IEs in the buffer are ordered
1527  * correctly, if not the result of using this function will not
1528  * be ordered correctly either, i.e. it does no reordering.
1529  *
1530  * The function returns the offset where the next part of the
1531  * buffer starts, which may be @ielen if the entire (remainder)
1532  * of the buffer should be used.
1533  */
1534 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1535                           const u8 *ids, int n_ids, size_t offset)
1536 {
1537         size_t pos = offset;
1538
1539         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1540                 pos += 2 + ies[pos + 1];
1541
1542         return pos;
1543 }
1544
1545 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1546 {
1547         size_t pos = offset;
1548
1549         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1550                 pos += 2 + ies[pos + 1];
1551
1552         return pos;
1553 }
1554
1555 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1556                                             int rssi_min_thold,
1557                                             int rssi_max_thold)
1558 {
1559         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1560
1561         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1562                 return;
1563
1564         /*
1565          * Scale up threshold values before storing it, as the RSSI averaging
1566          * algorithm uses a scaled up value as well. Change this scaling
1567          * factor if the RSSI averaging algorithm changes.
1568          */
1569         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1570         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1571 }
1572
1573 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1574                                     int rssi_min_thold,
1575                                     int rssi_max_thold)
1576 {
1577         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1578
1579         WARN_ON(rssi_min_thold == rssi_max_thold ||
1580                 rssi_min_thold > rssi_max_thold);
1581
1582         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1583                                        rssi_max_thold);
1584 }
1585 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1586
1587 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1588 {
1589         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1590
1591         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1592 }
1593 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1594
1595 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1596                               u16 cap)
1597 {
1598         __le16 tmp;
1599
1600         *pos++ = WLAN_EID_HT_CAPABILITY;
1601         *pos++ = sizeof(struct ieee80211_ht_cap);
1602         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1603
1604         /* capability flags */
1605         tmp = cpu_to_le16(cap);
1606         memcpy(pos, &tmp, sizeof(u16));
1607         pos += sizeof(u16);
1608
1609         /* AMPDU parameters */
1610         *pos++ = ht_cap->ampdu_factor |
1611                  (ht_cap->ampdu_density <<
1612                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1613
1614         /* MCS set */
1615         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1616         pos += sizeof(ht_cap->mcs);
1617
1618         /* extended capabilities */
1619         pos += sizeof(__le16);
1620
1621         /* BF capabilities */
1622         pos += sizeof(__le32);
1623
1624         /* antenna selection */
1625         pos += sizeof(u8);
1626
1627         return pos;
1628 }
1629
1630 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1631                                struct ieee80211_channel *channel,
1632                                enum nl80211_channel_type channel_type)
1633 {
1634         struct ieee80211_ht_operation *ht_oper;
1635         /* Build HT Information */
1636         *pos++ = WLAN_EID_HT_OPERATION;
1637         *pos++ = sizeof(struct ieee80211_ht_operation);
1638         ht_oper = (struct ieee80211_ht_operation *)pos;
1639         ht_oper->primary_chan =
1640                         ieee80211_frequency_to_channel(channel->center_freq);
1641         switch (channel_type) {
1642         case NL80211_CHAN_HT40MINUS:
1643                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1644                 break;
1645         case NL80211_CHAN_HT40PLUS:
1646                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1647                 break;
1648         case NL80211_CHAN_HT20:
1649         default:
1650                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1651                 break;
1652         }
1653         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
1654                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1655
1656         /*
1657          * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and
1658          * RIFS Mode are reserved in IBSS mode, therefore keep them at 0
1659          */
1660         ht_oper->operation_mode = 0x0000;
1661         ht_oper->stbc_param = 0x0000;
1662
1663         /* It seems that Basic MCS set and Supported MCS set
1664            are identical for the first 10 bytes */
1665         memset(&ht_oper->basic_set, 0, 16);
1666         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1667
1668         return pos + sizeof(struct ieee80211_ht_operation);
1669 }
1670
1671 enum nl80211_channel_type
1672 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1673 {
1674         enum nl80211_channel_type channel_type;
1675
1676         if (!ht_oper)
1677                 return NL80211_CHAN_NO_HT;
1678
1679         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1680         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1681                 channel_type = NL80211_CHAN_HT20;
1682                 break;
1683         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1684                 channel_type = NL80211_CHAN_HT40PLUS;
1685                 break;
1686         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1687                 channel_type = NL80211_CHAN_HT40MINUS;
1688                 break;
1689         default:
1690                 channel_type = NL80211_CHAN_NO_HT;
1691         }
1692
1693         return channel_type;
1694 }
1695
1696 int ieee80211_add_srates_ie(struct ieee80211_vif *vif,
1697                             struct sk_buff *skb, bool need_basic)
1698 {
1699         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1700         struct ieee80211_local *local = sdata->local;
1701         struct ieee80211_supported_band *sband;
1702         int rate;
1703         u8 i, rates, *pos;
1704         u32 basic_rates = vif->bss_conf.basic_rates;
1705
1706         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1707         rates = sband->n_bitrates;
1708         if (rates > 8)
1709                 rates = 8;
1710
1711         if (skb_tailroom(skb) < rates + 2)
1712                 return -ENOMEM;
1713
1714         pos = skb_put(skb, rates + 2);
1715         *pos++ = WLAN_EID_SUPP_RATES;
1716         *pos++ = rates;
1717         for (i = 0; i < rates; i++) {
1718                 u8 basic = 0;
1719                 if (need_basic && basic_rates & BIT(i))
1720                         basic = 0x80;
1721                 rate = sband->bitrates[i].bitrate;
1722                 *pos++ = basic | (u8) (rate / 5);
1723         }
1724
1725         return 0;
1726 }
1727
1728 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif,
1729                                 struct sk_buff *skb, bool need_basic)
1730 {
1731         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1732         struct ieee80211_local *local = sdata->local;
1733         struct ieee80211_supported_band *sband;
1734         int rate;
1735         u8 i, exrates, *pos;
1736         u32 basic_rates = vif->bss_conf.basic_rates;
1737
1738         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1739         exrates = sband->n_bitrates;
1740         if (exrates > 8)
1741                 exrates -= 8;
1742         else
1743                 exrates = 0;
1744
1745         if (skb_tailroom(skb) < exrates + 2)
1746                 return -ENOMEM;
1747
1748         if (exrates) {
1749                 pos = skb_put(skb, exrates + 2);
1750                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1751                 *pos++ = exrates;
1752                 for (i = 8; i < sband->n_bitrates; i++) {
1753                         u8 basic = 0;
1754                         if (need_basic && basic_rates & BIT(i))
1755                                 basic = 0x80;
1756                         rate = sband->bitrates[i].bitrate;
1757                         *pos++ = basic | (u8) (rate / 5);
1758                 }
1759         }
1760         return 0;
1761 }