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         int n_acs = IEEE80211_NUM_ACS;
 272
 273         if (local->hw.queues < IEEE80211_NUM_ACS)
 274                 n_acs = 1;
 275
 276         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 277                 int ac;
 278
 279                 if (!sdata->dev)
 280                         continue;
 281
 282                 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 283                         continue;
 284
 285                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 286                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 287                         continue;
 288
 289                 for (ac = 0; ac < n_acs; ac++) {
 290                         int ac_queue = sdata->vif.hw_queue[ac];
 291
 292                         if (ac_queue == queue ||
 293                             (sdata->vif.cab_queue == queue &&
 294                              local->queue_stop_reasons[ac_queue] == 0 &&
 295                              skb_queue_empty(&local->pending[ac_queue])))
 296                                 netif_wake_subqueue(sdata->dev, ac);
 297                 }
 298         }
 299 }
 300
 301 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 302                                    enum queue_stop_reason reason)
 303 {
 304         struct ieee80211_local *local = hw_to_local(hw);
 305
 306         trace_wake_queue(local, queue, reason);
 307
 308         if (WARN_ON(queue >= hw->queues))
 309                 return;
 310
 311         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 312                 return;
 313
 314         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 315
 316         if (local->queue_stop_reasons[queue] != 0)
 317                 /* someone still has this queue stopped */
 318                 return;
 319
 320         if (skb_queue_empty(&local->pending[queue])) {
 321                 rcu_read_lock();
 322                 ieee80211_propagate_queue_wake(local, queue);
 323                 rcu_read_unlock();
 324         } else
 325                 tasklet_schedule(&local->tx_pending_tasklet);
 326 }
 327
 328 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 329                                     enum queue_stop_reason reason)
 330 {
 331         struct ieee80211_local *local = hw_to_local(hw);
 332         unsigned long flags;
 333
 334         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 335         __ieee80211_wake_queue(hw, queue, reason);
 336         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 337 }
 338
 339 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 340 {
 341         ieee80211_wake_queue_by_reason(hw, queue,
 342                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 343 }
 344 EXPORT_SYMBOL(ieee80211_wake_queue);
 345
 346 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 347                                    enum queue_stop_reason reason)
 348 {
 349         struct ieee80211_local *local = hw_to_local(hw);
 350         struct ieee80211_sub_if_data *sdata;
 351         int n_acs = IEEE80211_NUM_ACS;
 352
 353         trace_stop_queue(local, queue, reason);
 354
 355         if (WARN_ON(queue >= hw->queues))
 356                 return;
 357
 358         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 359                 return;
 360
 361         __set_bit(reason, &local->queue_stop_reasons[queue]);
 362
 363         if (local->hw.queues < IEEE80211_NUM_ACS)
 364                 n_acs = 1;
 365
 366         rcu_read_lock();
 367         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 368                 int ac;
 369
 370                 if (!sdata->dev)
 371                         continue;
 372
 373                 for (ac = 0; ac < n_acs; ac++) {
 374                         if (sdata->vif.hw_queue[ac] == queue ||
 375                             sdata->vif.cab_queue == queue)
 376                                 netif_stop_subqueue(sdata->dev, ac);
 377                 }
 378         }
 379         rcu_read_unlock();
 380 }
 381
 382 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 383                                     enum queue_stop_reason reason)
 384 {
 385         struct ieee80211_local *local = hw_to_local(hw);
 386         unsigned long flags;
 387
 388         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 389         __ieee80211_stop_queue(hw, queue, reason);
 390         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 391 }
 392
 393 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 394 {
 395         ieee80211_stop_queue_by_reason(hw, queue,
 396                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 397 }
 398 EXPORT_SYMBOL(ieee80211_stop_queue);
 399
 400 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 401                                struct sk_buff *skb)
 402 {
 403         struct ieee80211_hw *hw = &local->hw;
 404         unsigned long flags;
 405         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 406         int queue = info->hw_queue;
 407
 408         if (WARN_ON(!info->control.vif)) {
 409                 ieee80211_free_txskb(&local->hw, skb);
 410                 return;
 411         }
 412
 413         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 414         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 415         __skb_queue_tail(&local->pending[queue], skb);
 416         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 417         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 418 }
 419
 420 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 421                                    struct sk_buff_head *skbs,
 422                                    void (*fn)(void *data), void *data)
 423 {
 424         struct ieee80211_hw *hw = &local->hw;
 425         struct sk_buff *skb;
 426         unsigned long flags;
 427         int queue, i;
 428
 429         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 430         while ((skb = skb_dequeue(skbs))) {
 431                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 432
 433                 if (WARN_ON(!info->control.vif)) {
 434                         ieee80211_free_txskb(&local->hw, skb);
 435                         continue;
 436                 }
 437
 438                 queue = info->hw_queue;
 439
 440                 __ieee80211_stop_queue(hw, queue,
 441                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 442
 443                 __skb_queue_tail(&local->pending[queue], skb);
 444         }
 445
 446         if (fn)
 447                 fn(data);
 448
 449         for (i = 0; i < hw->queues; i++)
 450                 __ieee80211_wake_queue(hw, i,
 451                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 452         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 453 }
 454
 455 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 456                                     enum queue_stop_reason reason)
 457 {
 458         struct ieee80211_local *local = hw_to_local(hw);
 459         unsigned long flags;
 460         int i;
 461
 462         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 463
 464         for (i = 0; i < hw->queues; i++)
 465                 __ieee80211_stop_queue(hw, i, reason);
 466
 467         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 468 }
 469
 470 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 471 {
 472         ieee80211_stop_queues_by_reason(hw,
 473                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 474 }
 475 EXPORT_SYMBOL(ieee80211_stop_queues);
 476
 477 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 478 {
 479         struct ieee80211_local *local = hw_to_local(hw);
 480         unsigned long flags;
 481         int ret;
 482
 483         if (WARN_ON(queue >= hw->queues))
 484                 return true;
 485
 486         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 487         ret = !!local->queue_stop_reasons[queue];
 488         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 489         return ret;
 490 }
 491 EXPORT_SYMBOL(ieee80211_queue_stopped);
 492
 493 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 494                                      enum queue_stop_reason reason)
 495 {
 496         struct ieee80211_local *local = hw_to_local(hw);
 497         unsigned long flags;
 498         int i;
 499
 500         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 501
 502         for (i = 0; i < hw->queues; i++)
 503                 __ieee80211_wake_queue(hw, i, reason);
 504
 505         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 506 }
 507
 508 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 509 {
 510         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 511 }
 512 EXPORT_SYMBOL(ieee80211_wake_queues);
 513
 514 void ieee80211_iterate_active_interfaces(
 515         struct ieee80211_hw *hw,
 516         void (*iterator)(void *data, u8 *mac,
 517                          struct ieee80211_vif *vif),
 518         void *data)
 519 {
 520         struct ieee80211_local *local = hw_to_local(hw);
 521         struct ieee80211_sub_if_data *sdata;
 522
 523         mutex_lock(&local->iflist_mtx);
 524
 525         list_for_each_entry(sdata, &local->interfaces, list) {
 526                 switch (sdata->vif.type) {
 527                 case NL80211_IFTYPE_MONITOR:
 528                 case NL80211_IFTYPE_AP_VLAN:
 529                         continue;
 530                 default:
 531                         break;
 532                 }
 533                 if (ieee80211_sdata_running(sdata))
 534                         iterator(data, sdata->vif.addr,
 535                                  &sdata->vif);
 536         }
 537
 538         sdata = rcu_dereference_protected(local->monitor_sdata,
 539                                           lockdep_is_held(&local->iflist_mtx));
 540         if (sdata)
 541                 iterator(data, sdata->vif.addr, &sdata->vif);
 542
 543         mutex_unlock(&local->iflist_mtx);
 544 }
 545 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 546
 547 void ieee80211_iterate_active_interfaces_atomic(
 548         struct ieee80211_hw *hw,
 549         void (*iterator)(void *data, u8 *mac,
 550                          struct ieee80211_vif *vif),
 551         void *data)
 552 {
 553         struct ieee80211_local *local = hw_to_local(hw);
 554         struct ieee80211_sub_if_data *sdata;
 555
 556         rcu_read_lock();
 557
 558         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 559                 switch (sdata->vif.type) {
 560                 case NL80211_IFTYPE_MONITOR:
 561                 case NL80211_IFTYPE_AP_VLAN:
 562                         continue;
 563                 default:
 564                         break;
 565                 }
 566                 if (ieee80211_sdata_running(sdata))
 567                         iterator(data, sdata->vif.addr,
 568                                  &sdata->vif);
 569         }
 570
 571         sdata = rcu_dereference(local->monitor_sdata);
 572         if (sdata)
 573                 iterator(data, sdata->vif.addr, &sdata->vif);
 574
 575         rcu_read_unlock();
 576 }
 577 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 578
 579 /*
 580  * Nothing should have been stuffed into the workqueue during
 581  * the suspend->resume cycle. If this WARN is seen then there
 582  * is a bug with either the driver suspend or something in
 583  * mac80211 stuffing into the workqueue which we haven't yet
 584  * cleared during mac80211's suspend cycle.
 585  */
 586 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 587 {
 588         if (WARN(local->suspended && !local->resuming,
 589                  "queueing ieee80211 work while going to suspend\n"))
 590                 return false;
 591
 592         return true;
 593 }
 594
 595 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 596 {
 597         struct ieee80211_local *local = hw_to_local(hw);
 598
 599         if (!ieee80211_can_queue_work(local))
 600                 return;
 601
 602         queue_work(local->workqueue, work);
 603 }
 604 EXPORT_SYMBOL(ieee80211_queue_work);
 605
 606 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 607                                   struct delayed_work *dwork,
 608                                   unsigned long delay)
 609 {
 610         struct ieee80211_local *local = hw_to_local(hw);
 611
 612         if (!ieee80211_can_queue_work(local))
 613                 return;
 614
 615         queue_delayed_work(local->workqueue, dwork, delay);
 616 }
 617 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 618
 619 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 620                                struct ieee802_11_elems *elems,
 621                                u64 filter, u32 crc)
 622 {
 623         size_t left = len;
 624         u8 *pos = start;
 625         bool calc_crc = filter != 0;
 626         DECLARE_BITMAP(seen_elems, 256);
 627
 628         bitmap_zero(seen_elems, 256);
 629         memset(elems, 0, sizeof(*elems));
 630         elems->ie_start = start;
 631         elems->total_len = len;
 632
 633         while (left >= 2) {
 634                 u8 id, elen;
 635                 bool elem_parse_failed;
 636
 637                 id = *pos++;
 638                 elen = *pos++;
 639                 left -= 2;
 640
 641                 if (elen > left) {
 642                         elems->parse_error = true;
 643                         break;
 644                 }
 645
 646                 if (id != WLAN_EID_VENDOR_SPECIFIC &&
 647                     id != WLAN_EID_QUIET &&
 648                     test_bit(id, seen_elems)) {
 649                         elems->parse_error = true;
 650                         left -= elen;
 651                         pos += elen;
 652                         continue;
 653                 }
 654
 655                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 656                         crc = crc32_be(crc, pos - 2, elen + 2);
 657
 658                 elem_parse_failed = false;
 659
 660                 switch (id) {
 661                 case WLAN_EID_SSID:
 662                         elems->ssid = pos;
 663                         elems->ssid_len = elen;
 664                         break;
 665                 case WLAN_EID_SUPP_RATES:
 666                         elems->supp_rates = pos;
 667                         elems->supp_rates_len = elen;
 668                         break;
 669                 case WLAN_EID_FH_PARAMS:
 670                         elems->fh_params = pos;
 671                         elems->fh_params_len = elen;
 672                         break;
 673                 case WLAN_EID_DS_PARAMS:
 674                         elems->ds_params = pos;
 675                         elems->ds_params_len = elen;
 676                         break;
 677                 case WLAN_EID_CF_PARAMS:
 678                         elems->cf_params = pos;
 679                         elems->cf_params_len = elen;
 680                         break;
 681                 case WLAN_EID_TIM:
 682                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 683                                 elems->tim = (void *)pos;
 684                                 elems->tim_len = elen;
 685                         } else
 686                                 elem_parse_failed = true;
 687                         break;
 688                 case WLAN_EID_IBSS_PARAMS:
 689                         elems->ibss_params = pos;
 690                         elems->ibss_params_len = elen;
 691                         break;
 692                 case WLAN_EID_CHALLENGE:
 693                         elems->challenge = pos;
 694                         elems->challenge_len = elen;
 695                         break;
 696                 case WLAN_EID_VENDOR_SPECIFIC:
 697                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 698                             pos[2] == 0xf2) {
 699                                 /* Microsoft OUI (00:50:F2) */
 700
 701                                 if (calc_crc)
 702                                         crc = crc32_be(crc, pos - 2, elen + 2);
 703
 704                                 if (pos[3] == 1) {
 705                                         /* OUI Type 1 - WPA IE */
 706                                         elems->wpa = pos;
 707                                         elems->wpa_len = elen;
 708                                 } else if (elen >= 5 && pos[3] == 2) {
 709                                         /* OUI Type 2 - WMM IE */
 710                                         if (pos[4] == 0) {
 711                                                 elems->wmm_info = pos;
 712                                                 elems->wmm_info_len = elen;
 713                                         } else if (pos[4] == 1) {
 714                                                 elems->wmm_param = pos;
 715                                                 elems->wmm_param_len = elen;
 716                                         }
 717                                 }
 718                         }
 719                         break;
 720                 case WLAN_EID_RSN:
 721                         elems->rsn = pos;
 722                         elems->rsn_len = elen;
 723                         break;
 724                 case WLAN_EID_ERP_INFO:
 725                         elems->erp_info = pos;
 726                         elems->erp_info_len = elen;
 727                         break;
 728                 case WLAN_EID_EXT_SUPP_RATES:
 729                         elems->ext_supp_rates = pos;
 730                         elems->ext_supp_rates_len = elen;
 731                         break;
 732                 case WLAN_EID_HT_CAPABILITY:
 733                         if (elen >= sizeof(struct ieee80211_ht_cap))
 734                                 elems->ht_cap_elem = (void *)pos;
 735                         else
 736                                 elem_parse_failed = true;
 737                         break;
 738                 case WLAN_EID_HT_OPERATION:
 739                         if (elen >= sizeof(struct ieee80211_ht_operation))
 740                                 elems->ht_operation = (void *)pos;
 741                         else
 742                                 elem_parse_failed = true;
 743                         break;
 744                 case WLAN_EID_MESH_ID:
 745                         elems->mesh_id = pos;
 746                         elems->mesh_id_len = elen;
 747                         break;
 748                 case WLAN_EID_MESH_CONFIG:
 749                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 750                                 elems->mesh_config = (void *)pos;
 751                         else
 752                                 elem_parse_failed = true;
 753                         break;
 754                 case WLAN_EID_PEER_MGMT:
 755                         elems->peering = pos;
 756                         elems->peering_len = elen;
 757                         break;
 758                 case WLAN_EID_PREQ:
 759                         elems->preq = pos;
 760                         elems->preq_len = elen;
 761                         break;
 762                 case WLAN_EID_PREP:
 763                         elems->prep = pos;
 764                         elems->prep_len = elen;
 765                         break;
 766                 case WLAN_EID_PERR:
 767                         elems->perr = pos;
 768                         elems->perr_len = elen;
 769                         break;
 770                 case WLAN_EID_RANN:
 771                         if (elen >= sizeof(struct ieee80211_rann_ie))
 772                                 elems->rann = (void *)pos;
 773                         else
 774                                 elem_parse_failed = true;
 775                         break;
 776                 case WLAN_EID_CHANNEL_SWITCH:
 777                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 778                                 elem_parse_failed = true;
 779                                 break;
 780                         }
 781                         elems->ch_switch_ie = (void *)pos;
 782                         break;
 783                 case WLAN_EID_QUIET:
 784                         if (!elems->quiet_elem) {
 785                                 elems->quiet_elem = pos;
 786                                 elems->quiet_elem_len = elen;
 787                         }
 788                         elems->num_of_quiet_elem++;
 789                         break;
 790                 case WLAN_EID_COUNTRY:
 791                         elems->country_elem = pos;
 792                         elems->country_elem_len = elen;
 793                         break;
 794                 case WLAN_EID_PWR_CONSTRAINT:
 795                         if (elen != 1) {
 796                                 elem_parse_failed = true;
 797                                 break;
 798                         }
 799                         elems->pwr_constr_elem = pos;
 800                         break;
 801                 case WLAN_EID_TIMEOUT_INTERVAL:
 802                         elems->timeout_int = pos;
 803                         elems->timeout_int_len = elen;
 804                         break;
 805                 default:
 806                         break;
 807                 }
 808
 809                 if (elem_parse_failed)
 810                         elems->parse_error = true;
 811                 else
 812                         set_bit(id, seen_elems);
 813
 814                 left -= elen;
 815                 pos += elen;
 816         }
 817
 818         if (left != 0)
 819                 elems->parse_error = true;
 820
 821         return crc;
 822 }
 823
 824 void ieee802_11_parse_elems(u8 *start, size_t len,
 825                             struct ieee802_11_elems *elems)
 826 {
 827         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 828 }
 829
 830 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 831                                bool bss_notify)
 832 {
 833         struct ieee80211_local *local = sdata->local;
 834         struct ieee80211_tx_queue_params qparam;
 835         int ac;
 836         bool use_11b, enable_qos;
 837         int aCWmin, aCWmax;
 838
 839         if (!local->ops->conf_tx)
 840                 return;
 841
 842         if (local->hw.queues < IEEE80211_NUM_ACS)
 843                 return;
 844
 845         memset(&qparam, 0, sizeof(qparam));
 846
 847         use_11b = (local->oper_channel->band == IEEE80211_BAND_2GHZ) &&
 848                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 849
 850         /*
 851          * By default disable QoS in STA mode for old access points, which do
 852          * not support 802.11e. New APs will provide proper queue parameters,
 853          * that we will configure later.
 854          */
 855         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 856
 857         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 858                 /* Set defaults according to 802.11-2007 Table 7-37 */
 859                 aCWmax = 1023;
 860                 if (use_11b)
 861                         aCWmin = 31;
 862                 else
 863                         aCWmin = 15;
 864
 865                 if (enable_qos) {
 866                         switch (ac) {
 867                         case IEEE80211_AC_BK:
 868                                 qparam.cw_max = aCWmax;
 869                                 qparam.cw_min = aCWmin;
 870                                 qparam.txop = 0;
 871                                 qparam.aifs = 7;
 872                                 break;
 873                         /* never happens but let's not leave undefined */
 874                         default:
 875                         case IEEE80211_AC_BE:
 876                                 qparam.cw_max = aCWmax;
 877                                 qparam.cw_min = aCWmin;
 878                                 qparam.txop = 0;
 879                                 qparam.aifs = 3;
 880                                 break;
 881                         case IEEE80211_AC_VI:
 882                                 qparam.cw_max = aCWmin;
 883                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 884                                 if (use_11b)
 885                                         qparam.txop = 6016/32;
 886                                 else
 887                                         qparam.txop = 3008/32;
 888                                 qparam.aifs = 2;
 889                                 break;
 890                         case IEEE80211_AC_VO:
 891                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 892                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 893                                 if (use_11b)
 894                                         qparam.txop = 3264/32;
 895                                 else
 896                                         qparam.txop = 1504/32;
 897                                 qparam.aifs = 2;
 898                                 break;
 899                         }
 900                 } else {
 901                         /* Confiure old 802.11b/g medium access rules. */
 902                         qparam.cw_max = aCWmax;
 903                         qparam.cw_min = aCWmin;
 904                         qparam.txop = 0;
 905                         qparam.aifs = 2;
 906                 }
 907
 908                 qparam.uapsd = false;
 909
 910                 sdata->tx_conf[ac] = qparam;
 911                 drv_conf_tx(local, sdata, ac, &qparam);
 912         }
 913
 914         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 915             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 916                 sdata->vif.bss_conf.qos = enable_qos;
 917                 if (bss_notify)
 918                         ieee80211_bss_info_change_notify(sdata,
 919                                                          BSS_CHANGED_QOS);
 920         }
 921 }
 922
 923 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 924                                   const size_t supp_rates_len,
 925                                   const u8 *supp_rates)
 926 {
 927         struct ieee80211_local *local = sdata->local;
 928         int i, have_higher_than_11mbit = 0;
 929
 930         /* cf. IEEE 802.11 9.2.12 */
 931         for (i = 0; i < supp_rates_len; i++)
 932                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 933                         have_higher_than_11mbit = 1;
 934
 935         if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
 936             have_higher_than_11mbit)
 937                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 938         else
 939                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 940
 941         ieee80211_set_wmm_default(sdata, true);
 942 }
 943
 944 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 945                               enum ieee80211_band band)
 946 {
 947         struct ieee80211_supported_band *sband;
 948         struct ieee80211_rate *bitrates;
 949         u32 mandatory_rates;
 950         enum ieee80211_rate_flags mandatory_flag;
 951         int i;
 952
 953         sband = local->hw.wiphy->bands[band];
 954         if (WARN_ON(!sband))
 955                 return 1;
 956
 957         if (band == IEEE80211_BAND_2GHZ)
 958                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 959         else
 960                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 961
 962         bitrates = sband->bitrates;
 963         mandatory_rates = 0;
 964         for (i = 0; i < sband->n_bitrates; i++)
 965                 if (bitrates[i].flags & mandatory_flag)
 966                         mandatory_rates |= BIT(i);
 967         return mandatory_rates;
 968 }
 969
 970 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 971                          u16 transaction, u16 auth_alg,
 972                          u8 *extra, size_t extra_len, const u8 *da,
 973                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 974 {
 975         struct ieee80211_local *local = sdata->local;
 976         struct sk_buff *skb;
 977         struct ieee80211_mgmt *mgmt;
 978         int err;
 979
 980         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 981                             sizeof(*mgmt) + 6 + extra_len);
 982         if (!skb)
 983                 return;
 984
 985         skb_reserve(skb, local->hw.extra_tx_headroom);
 986
 987         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 988         memset(mgmt, 0, 24 + 6);
 989         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 990                                           IEEE80211_STYPE_AUTH);
 991         memcpy(mgmt->da, da, ETH_ALEN);
 992         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 993         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 994         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 995         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 996         mgmt->u.auth.status_code = cpu_to_le16(0);
 997         if (extra)
 998                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 999
1000         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1001                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1002                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1003                 WARN_ON(err);
1004         }
1005
1006         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1007         ieee80211_tx_skb(sdata, skb);
1008 }
1009
1010 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1011                                     const u8 *bssid, u16 stype, u16 reason,
1012                                     bool send_frame, u8 *frame_buf)
1013 {
1014         struct ieee80211_local *local = sdata->local;
1015         struct sk_buff *skb;
1016         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1017
1018         /* build frame */
1019         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1020         mgmt->duration = 0; /* initialize only */
1021         mgmt->seq_ctrl = 0; /* initialize only */
1022         memcpy(mgmt->da, bssid, ETH_ALEN);
1023         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1024         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1025         /* u.deauth.reason_code == u.disassoc.reason_code */
1026         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1027
1028         if (send_frame) {
1029                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1030                                     IEEE80211_DEAUTH_FRAME_LEN);
1031                 if (!skb)
1032                         return;
1033
1034                 skb_reserve(skb, local->hw.extra_tx_headroom);
1035
1036                 /* copy in frame */
1037                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1038                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1039
1040                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1041                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1042                         IEEE80211_SKB_CB(skb)->flags |=
1043                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1044
1045                 ieee80211_tx_skb(sdata, skb);
1046         }
1047 }
1048
1049 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1050                              const u8 *ie, size_t ie_len,
1051                              enum ieee80211_band band, u32 rate_mask,
1052                              u8 channel)
1053 {
1054         struct ieee80211_supported_band *sband;
1055         u8 *pos;
1056         size_t offset = 0, noffset;
1057         int supp_rates_len, i;
1058         u8 rates[32];
1059         int num_rates;
1060         int ext_rates_len;
1061
1062         sband = local->hw.wiphy->bands[band];
1063         if (WARN_ON_ONCE(!sband))
1064                 return 0;
1065
1066         pos = buffer;
1067
1068         num_rates = 0;
1069         for (i = 0; i < sband->n_bitrates; i++) {
1070                 if ((BIT(i) & rate_mask) == 0)
1071                         continue; /* skip rate */
1072                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1073         }
1074
1075         supp_rates_len = min_t(int, num_rates, 8);
1076
1077         *pos++ = WLAN_EID_SUPP_RATES;
1078         *pos++ = supp_rates_len;
1079         memcpy(pos, rates, supp_rates_len);
1080         pos += supp_rates_len;
1081
1082         /* insert "request information" if in custom IEs */
1083         if (ie && ie_len) {
1084                 static const u8 before_extrates[] = {
1085                         WLAN_EID_SSID,
1086                         WLAN_EID_SUPP_RATES,
1087                         WLAN_EID_REQUEST,
1088                 };
1089                 noffset = ieee80211_ie_split(ie, ie_len,
1090                                              before_extrates,
1091                                              ARRAY_SIZE(before_extrates),
1092                                              offset);
1093                 memcpy(pos, ie + offset, noffset - offset);
1094                 pos += noffset - offset;
1095                 offset = noffset;
1096         }
1097
1098         ext_rates_len = num_rates - supp_rates_len;
1099         if (ext_rates_len > 0) {
1100                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1101                 *pos++ = ext_rates_len;
1102                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1103                 pos += ext_rates_len;
1104         }
1105
1106         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1107                 *pos++ = WLAN_EID_DS_PARAMS;
1108                 *pos++ = 1;
1109                 *pos++ = channel;
1110         }
1111
1112         /* insert custom IEs that go before HT */
1113         if (ie && ie_len) {
1114                 static const u8 before_ht[] = {
1115                         WLAN_EID_SSID,
1116                         WLAN_EID_SUPP_RATES,
1117                         WLAN_EID_REQUEST,
1118                         WLAN_EID_EXT_SUPP_RATES,
1119                         WLAN_EID_DS_PARAMS,
1120                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1121                 };
1122                 noffset = ieee80211_ie_split(ie, ie_len,
1123                                              before_ht, ARRAY_SIZE(before_ht),
1124                                              offset);
1125                 memcpy(pos, ie + offset, noffset - offset);
1126                 pos += noffset - offset;
1127                 offset = noffset;
1128         }
1129
1130         if (sband->ht_cap.ht_supported)
1131                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1132                                                 sband->ht_cap.cap);
1133
1134         /*
1135          * If adding more here, adjust code in main.c
1136          * that calculates local->scan_ies_len.
1137          */
1138
1139         /* add any remaining custom IEs */
1140         if (ie && ie_len) {
1141                 noffset = ie_len;
1142                 memcpy(pos, ie + offset, noffset - offset);
1143                 pos += noffset - offset;
1144         }
1145
1146         if (sband->vht_cap.vht_supported)
1147                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1148                                                  sband->vht_cap.cap);
1149
1150         return pos - buffer;
1151 }
1152
1153 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1154                                           u8 *dst, u32 ratemask,
1155                                           struct ieee80211_channel *chan,
1156                                           const u8 *ssid, size_t ssid_len,
1157                                           const u8 *ie, size_t ie_len,
1158                                           bool directed)
1159 {
1160         struct ieee80211_local *local = sdata->local;
1161         struct sk_buff *skb;
1162         struct ieee80211_mgmt *mgmt;
1163         size_t buf_len;
1164         u8 *buf;
1165         u8 chan_no;
1166
1167         /* FIXME: come up with a proper value */
1168         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1169         if (!buf)
1170                 return NULL;
1171
1172         /*
1173          * Do not send DS Channel parameter for directed probe requests
1174          * in order to maximize the chance that we get a response.  Some
1175          * badly-behaved APs don't respond when this parameter is included.
1176          */
1177         if (directed)
1178                 chan_no = 0;
1179         else
1180                 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1181
1182         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, chan->band,
1183                                            ratemask, chan_no);
1184
1185         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1186                                      ssid, ssid_len,
1187                                      buf, buf_len);
1188         if (!skb)
1189                 goto out;
1190
1191         if (dst) {
1192                 mgmt = (struct ieee80211_mgmt *) skb->data;
1193                 memcpy(mgmt->da, dst, ETH_ALEN);
1194                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1195         }
1196
1197         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1198
1199  out:
1200         kfree(buf);
1201
1202         return skb;
1203 }
1204
1205 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1206                               const u8 *ssid, size_t ssid_len,
1207                               const u8 *ie, size_t ie_len,
1208                               u32 ratemask, bool directed, bool no_cck,
1209                               struct ieee80211_channel *channel)
1210 {
1211         struct sk_buff *skb;
1212
1213         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1214                                         ssid, ssid_len,
1215                                         ie, ie_len, directed);
1216         if (skb) {
1217                 if (no_cck)
1218                         IEEE80211_SKB_CB(skb)->flags |=
1219                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1220                 ieee80211_tx_skb(sdata, skb);
1221         }
1222 }
1223
1224 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1225                             struct ieee802_11_elems *elems,
1226                             enum ieee80211_band band, u32 *basic_rates)
1227 {
1228         struct ieee80211_supported_band *sband;
1229         struct ieee80211_rate *bitrates;
1230         size_t num_rates;
1231         u32 supp_rates;
1232         int i, j;
1233         sband = local->hw.wiphy->bands[band];
1234
1235         if (WARN_ON(!sband))
1236                 return 1;
1237
1238         bitrates = sband->bitrates;
1239         num_rates = sband->n_bitrates;
1240         supp_rates = 0;
1241         for (i = 0; i < elems->supp_rates_len +
1242                      elems->ext_supp_rates_len; i++) {
1243                 u8 rate = 0;
1244                 int own_rate;
1245                 bool is_basic;
1246                 if (i < elems->supp_rates_len)
1247                         rate = elems->supp_rates[i];
1248                 else if (elems->ext_supp_rates)
1249                         rate = elems->ext_supp_rates
1250                                 [i - elems->supp_rates_len];
1251                 own_rate = 5 * (rate & 0x7f);
1252                 is_basic = !!(rate & 0x80);
1253
1254                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1255                         continue;
1256
1257                 for (j = 0; j < num_rates; j++) {
1258                         if (bitrates[j].bitrate == own_rate) {
1259                                 supp_rates |= BIT(j);
1260                                 if (basic_rates && is_basic)
1261                                         *basic_rates |= BIT(j);
1262                         }
1263                 }
1264         }
1265         return supp_rates;
1266 }
1267
1268 void ieee80211_stop_device(struct ieee80211_local *local)
1269 {
1270         ieee80211_led_radio(local, false);
1271         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1272
1273         cancel_work_sync(&local->reconfig_filter);
1274
1275         flush_workqueue(local->workqueue);
1276         drv_stop(local);
1277 }
1278
1279 int ieee80211_reconfig(struct ieee80211_local *local)
1280 {
1281         struct ieee80211_hw *hw = &local->hw;
1282         struct ieee80211_sub_if_data *sdata;
1283         struct sta_info *sta;
1284         int res, i;
1285
1286 #ifdef CONFIG_PM
1287         if (local->suspended)
1288                 local->resuming = true;
1289
1290         if (local->wowlan) {
1291                 local->wowlan = false;
1292                 res = drv_resume(local);
1293                 if (res < 0) {
1294                         local->resuming = false;
1295                         return res;
1296                 }
1297                 if (res == 0)
1298                         goto wake_up;
1299                 WARN_ON(res > 1);
1300                 /*
1301                  * res is 1, which means the driver requested
1302                  * to go through a regular reset on wakeup.
1303                  */
1304         }
1305 #endif
1306         /* everything else happens only if HW was up & running */
1307         if (!local->open_count)
1308                 goto wake_up;
1309
1310         /*
1311          * Upon resume hardware can sometimes be goofy due to
1312          * various platform / driver / bus issues, so restarting
1313          * the device may at times not work immediately. Propagate
1314          * the error.
1315          */
1316         res = drv_start(local);
1317         if (res) {
1318                 WARN(local->suspended, "Hardware became unavailable "
1319                      "upon resume. This could be a software issue "
1320                      "prior to suspend or a hardware issue.\n");
1321                 return res;
1322         }
1323
1324         /* setup fragmentation threshold */
1325         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1326
1327         /* setup RTS threshold */
1328         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1329
1330         /* reset coverage class */
1331         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1332
1333         ieee80211_led_radio(local, true);
1334         ieee80211_mod_tpt_led_trig(local,
1335                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1336
1337         /* add interfaces */
1338         sdata = rtnl_dereference(local->monitor_sdata);
1339         if (sdata) {
1340                 res = drv_add_interface(local, sdata);
1341                 if (WARN_ON(res)) {
1342                         rcu_assign_pointer(local->monitor_sdata, NULL);
1343                         synchronize_net();
1344                         kfree(sdata);
1345                 }
1346         }
1347
1348         list_for_each_entry(sdata, &local->interfaces, list) {
1349                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1350                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1351                     ieee80211_sdata_running(sdata))
1352                         res = drv_add_interface(local, sdata);
1353         }
1354
1355         /* add STAs back */
1356         mutex_lock(&local->sta_mtx);
1357         list_for_each_entry(sta, &local->sta_list, list) {
1358                 enum ieee80211_sta_state state;
1359
1360                 if (!sta->uploaded)
1361                         continue;
1362
1363                 /* AP-mode stations will be added later */
1364                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1365                         continue;
1366
1367                 for (state = IEEE80211_STA_NOTEXIST;
1368                      state < sta->sta_state; state++)
1369                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1370                                               state + 1));
1371         }
1372         mutex_unlock(&local->sta_mtx);
1373
1374         /* reconfigure tx conf */
1375         if (hw->queues >= IEEE80211_NUM_ACS) {
1376                 list_for_each_entry(sdata, &local->interfaces, list) {
1377                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1378                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1379                             !ieee80211_sdata_running(sdata))
1380                                 continue;
1381
1382                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1383                                 drv_conf_tx(local, sdata, i,
1384                                             &sdata->tx_conf[i]);
1385                 }
1386         }
1387
1388         /* reconfigure hardware */
1389         ieee80211_hw_config(local, ~0);
1390
1391         ieee80211_configure_filter(local);
1392
1393         /* Finally also reconfigure all the BSS information */
1394         list_for_each_entry(sdata, &local->interfaces, list) {
1395                 u32 changed;
1396
1397                 if (!ieee80211_sdata_running(sdata))
1398                         continue;
1399
1400                 /* common change flags for all interface types */
1401                 changed = BSS_CHANGED_ERP_CTS_PROT |
1402                           BSS_CHANGED_ERP_PREAMBLE |
1403                           BSS_CHANGED_ERP_SLOT |
1404                           BSS_CHANGED_HT |
1405                           BSS_CHANGED_BASIC_RATES |
1406                           BSS_CHANGED_BEACON_INT |
1407                           BSS_CHANGED_BSSID |
1408                           BSS_CHANGED_CQM |
1409                           BSS_CHANGED_QOS |
1410                           BSS_CHANGED_IDLE;
1411
1412                 switch (sdata->vif.type) {
1413                 case NL80211_IFTYPE_STATION:
1414                         changed |= BSS_CHANGED_ASSOC |
1415                                    BSS_CHANGED_ARP_FILTER |
1416                                    BSS_CHANGED_PS;
1417                         mutex_lock(&sdata->u.mgd.mtx);
1418                         ieee80211_bss_info_change_notify(sdata, changed);
1419                         mutex_unlock(&sdata->u.mgd.mtx);
1420                         break;
1421                 case NL80211_IFTYPE_ADHOC:
1422                         changed |= BSS_CHANGED_IBSS;
1423                         /* fall through */
1424                 case NL80211_IFTYPE_AP:
1425                         changed |= BSS_CHANGED_SSID;
1426
1427                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1428                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1429
1430                         /* fall through */
1431                 case NL80211_IFTYPE_MESH_POINT:
1432                         changed |= BSS_CHANGED_BEACON |
1433                                    BSS_CHANGED_BEACON_ENABLED;
1434                         ieee80211_bss_info_change_notify(sdata, changed);
1435                         break;
1436                 case NL80211_IFTYPE_WDS:
1437                         break;
1438                 case NL80211_IFTYPE_AP_VLAN:
1439                 case NL80211_IFTYPE_MONITOR:
1440                         /* ignore virtual */
1441                         break;
1442                 case NL80211_IFTYPE_P2P_DEVICE:
1443                         changed = BSS_CHANGED_IDLE;
1444                         break;
1445                 case NL80211_IFTYPE_UNSPECIFIED:
1446                 case NUM_NL80211_IFTYPES:
1447                 case NL80211_IFTYPE_P2P_CLIENT:
1448                 case NL80211_IFTYPE_P2P_GO:
1449                         WARN_ON(1);
1450                         break;
1451                 }
1452         }
1453
1454         ieee80211_recalc_ps(local, -1);
1455
1456         /*
1457          * The sta might be in psm against the ap (e.g. because
1458          * this was the state before a hw restart), so we
1459          * explicitly send a null packet in order to make sure
1460          * it'll sync against the ap (and get out of psm).
1461          */
1462         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1463                 list_for_each_entry(sdata, &local->interfaces, list) {
1464                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1465                                 continue;
1466
1467                         ieee80211_send_nullfunc(local, sdata, 0);
1468                 }
1469         }
1470
1471         /* APs are now beaconing, add back stations */
1472         mutex_lock(&local->sta_mtx);
1473         list_for_each_entry(sta, &local->sta_list, list) {
1474                 enum ieee80211_sta_state state;
1475
1476                 if (!sta->uploaded)
1477                         continue;
1478
1479                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1480                         continue;
1481
1482                 for (state = IEEE80211_STA_NOTEXIST;
1483                      state < sta->sta_state; state++)
1484                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1485                                               state + 1));
1486         }
1487         mutex_unlock(&local->sta_mtx);
1488
1489         /* add back keys */
1490         list_for_each_entry(sdata, &local->interfaces, list)
1491                 if (ieee80211_sdata_running(sdata))
1492                         ieee80211_enable_keys(sdata);
1493
1494  wake_up:
1495         local->in_reconfig = false;
1496         barrier();
1497
1498         /*
1499          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1500          * sessions can be established after a resume.
1501          *
1502          * Also tear down aggregation sessions since reconfiguring
1503          * them in a hardware restart scenario is not easily done
1504          * right now, and the hardware will have lost information
1505          * about the sessions, but we and the AP still think they
1506          * are active. This is really a workaround though.
1507          */
1508         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1509                 mutex_lock(&local->sta_mtx);
1510
1511                 list_for_each_entry(sta, &local->sta_list, list) {
1512                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1513                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1514                 }
1515
1516                 mutex_unlock(&local->sta_mtx);
1517         }
1518
1519         ieee80211_wake_queues_by_reason(hw,
1520                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1521
1522         /*
1523          * If this is for hw restart things are still running.
1524          * We may want to change that later, however.
1525          */
1526         if (!local->suspended)
1527                 return 0;
1528
1529 #ifdef CONFIG_PM
1530         /* first set suspended false, then resuming */
1531         local->suspended = false;
1532         mb();
1533         local->resuming = false;
1534
1535         list_for_each_entry(sdata, &local->interfaces, list) {
1536                 switch(sdata->vif.type) {
1537                 case NL80211_IFTYPE_STATION:
1538                         ieee80211_sta_restart(sdata);
1539                         break;
1540                 case NL80211_IFTYPE_ADHOC:
1541                         ieee80211_ibss_restart(sdata);
1542                         break;
1543                 case NL80211_IFTYPE_MESH_POINT:
1544                         ieee80211_mesh_restart(sdata);
1545                         break;
1546                 default:
1547                         break;
1548                 }
1549         }
1550
1551         mod_timer(&local->sta_cleanup, jiffies + 1);
1552
1553         mutex_lock(&local->sta_mtx);
1554         list_for_each_entry(sta, &local->sta_list, list)
1555                 mesh_plink_restart(sta);
1556         mutex_unlock(&local->sta_mtx);
1557 #else
1558         WARN_ON(1);
1559 #endif
1560         return 0;
1561 }
1562
1563 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1564 {
1565         struct ieee80211_sub_if_data *sdata;
1566         struct ieee80211_local *local;
1567         struct ieee80211_key *key;
1568
1569         if (WARN_ON(!vif))
1570                 return;
1571
1572         sdata = vif_to_sdata(vif);
1573         local = sdata->local;
1574
1575         if (WARN_ON(!local->resuming))
1576                 return;
1577
1578         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1579                 return;
1580
1581         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1582
1583         mutex_lock(&local->key_mtx);
1584         list_for_each_entry(key, &sdata->key_list, list)
1585                 key->flags |= KEY_FLAG_TAINTED;
1586         mutex_unlock(&local->key_mtx);
1587 }
1588 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1589
1590 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1591                           enum ieee80211_smps_mode *smps_mode)
1592 {
1593         if (ifmgd->associated) {
1594                 *smps_mode = ifmgd->ap_smps;
1595
1596                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1597                         if (ifmgd->powersave)
1598                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1599                         else
1600                                 *smps_mode = IEEE80211_SMPS_OFF;
1601                 }
1602
1603                 return 1;
1604         }
1605
1606         return 0;
1607 }
1608
1609 void ieee80211_recalc_smps(struct ieee80211_local *local)
1610 {
1611         struct ieee80211_sub_if_data *sdata;
1612         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1613         int count = 0;
1614
1615         mutex_lock(&local->iflist_mtx);
1616
1617         /*
1618          * This function could be improved to handle multiple
1619          * interfaces better, but right now it makes any
1620          * non-station interfaces force SM PS to be turned
1621          * off. If there are multiple station interfaces it
1622          * could also use the best possible mode, e.g. if
1623          * one is in static and the other in dynamic then
1624          * dynamic is ok.
1625          */
1626
1627         list_for_each_entry(sdata, &local->interfaces, list) {
1628                 if (!ieee80211_sdata_running(sdata))
1629                         continue;
1630                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
1631                         continue;
1632                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1633                         goto set;
1634
1635                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1636
1637                 if (count > 1) {
1638                         smps_mode = IEEE80211_SMPS_OFF;
1639                         break;
1640                 }
1641         }
1642
1643         if (smps_mode == local->smps_mode)
1644                 goto unlock;
1645
1646  set:
1647         local->smps_mode = smps_mode;
1648         /* changed flag is auto-detected for this */
1649         ieee80211_hw_config(local, 0);
1650  unlock:
1651         mutex_unlock(&local->iflist_mtx);
1652 }
1653
1654 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1655 {
1656         int i;
1657
1658         for (i = 0; i < n_ids; i++)
1659                 if (ids[i] == id)
1660                         return true;
1661         return false;
1662 }
1663
1664 /**
1665  * ieee80211_ie_split - split an IE buffer according to ordering
1666  *
1667  * @ies: the IE buffer
1668  * @ielen: the length of the IE buffer
1669  * @ids: an array with element IDs that are allowed before
1670  *      the split
1671  * @n_ids: the size of the element ID array
1672  * @offset: offset where to start splitting in the buffer
1673  *
1674  * This function splits an IE buffer by updating the @offset
1675  * variable to point to the location where the buffer should be
1676  * split.
1677  *
1678  * It assumes that the given IE buffer is well-formed, this
1679  * has to be guaranteed by the caller!
1680  *
1681  * It also assumes that the IEs in the buffer are ordered
1682  * correctly, if not the result of using this function will not
1683  * be ordered correctly either, i.e. it does no reordering.
1684  *
1685  * The function returns the offset where the next part of the
1686  * buffer starts, which may be @ielen if the entire (remainder)
1687  * of the buffer should be used.
1688  */
1689 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1690                           const u8 *ids, int n_ids, size_t offset)
1691 {
1692         size_t pos = offset;
1693
1694         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1695                 pos += 2 + ies[pos + 1];
1696
1697         return pos;
1698 }
1699
1700 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1701 {
1702         size_t pos = offset;
1703
1704         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1705                 pos += 2 + ies[pos + 1];
1706
1707         return pos;
1708 }
1709
1710 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1711                                             int rssi_min_thold,
1712                                             int rssi_max_thold)
1713 {
1714         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1715
1716         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1717                 return;
1718
1719         /*
1720          * Scale up threshold values before storing it, as the RSSI averaging
1721          * algorithm uses a scaled up value as well. Change this scaling
1722          * factor if the RSSI averaging algorithm changes.
1723          */
1724         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1725         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1726 }
1727
1728 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1729                                     int rssi_min_thold,
1730                                     int rssi_max_thold)
1731 {
1732         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1733
1734         WARN_ON(rssi_min_thold == rssi_max_thold ||
1735                 rssi_min_thold > rssi_max_thold);
1736
1737         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1738                                        rssi_max_thold);
1739 }
1740 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1741
1742 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1743 {
1744         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1745
1746         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1747 }
1748 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1749
1750 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1751                               u16 cap)
1752 {
1753         __le16 tmp;
1754
1755         *pos++ = WLAN_EID_HT_CAPABILITY;
1756         *pos++ = sizeof(struct ieee80211_ht_cap);
1757         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1758
1759         /* capability flags */
1760         tmp = cpu_to_le16(cap);
1761         memcpy(pos, &tmp, sizeof(u16));
1762         pos += sizeof(u16);
1763
1764         /* AMPDU parameters */
1765         *pos++ = ht_cap->ampdu_factor |
1766                  (ht_cap->ampdu_density <<
1767                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1768
1769         /* MCS set */
1770         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1771         pos += sizeof(ht_cap->mcs);
1772
1773         /* extended capabilities */
1774         pos += sizeof(__le16);
1775
1776         /* BF capabilities */
1777         pos += sizeof(__le32);
1778
1779         /* antenna selection */
1780         pos += sizeof(u8);
1781
1782         return pos;
1783 }
1784
1785 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1786                                                            u32 cap)
1787 {
1788         __le32 tmp;
1789
1790         *pos++ = WLAN_EID_VHT_CAPABILITY;
1791         *pos++ = sizeof(struct ieee80211_vht_capabilities);
1792         memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1793
1794         /* capability flags */
1795         tmp = cpu_to_le32(cap);
1796         memcpy(pos, &tmp, sizeof(u32));
1797         pos += sizeof(u32);
1798
1799         /* VHT MCS set */
1800         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1801         pos += sizeof(vht_cap->vht_mcs);
1802
1803         return pos;
1804 }
1805
1806 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1807                                struct ieee80211_channel *channel,
1808                                enum nl80211_channel_type channel_type,
1809                                u16 prot_mode)
1810 {
1811         struct ieee80211_ht_operation *ht_oper;
1812         /* Build HT Information */
1813         *pos++ = WLAN_EID_HT_OPERATION;
1814         *pos++ = sizeof(struct ieee80211_ht_operation);
1815         ht_oper = (struct ieee80211_ht_operation *)pos;
1816         ht_oper->primary_chan =
1817                         ieee80211_frequency_to_channel(channel->center_freq);
1818         switch (channel_type) {
1819         case NL80211_CHAN_HT40MINUS:
1820                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1821                 break;
1822         case NL80211_CHAN_HT40PLUS:
1823                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1824                 break;
1825         case NL80211_CHAN_HT20:
1826         default:
1827                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1828                 break;
1829         }
1830         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1831             channel_type != NL80211_CHAN_NO_HT &&
1832             channel_type != NL80211_CHAN_HT20)
1833                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1834
1835         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1836         ht_oper->stbc_param = 0x0000;
1837
1838         /* It seems that Basic MCS set and Supported MCS set
1839            are identical for the first 10 bytes */
1840         memset(&ht_oper->basic_set, 0, 16);
1841         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1842
1843         return pos + sizeof(struct ieee80211_ht_operation);
1844 }
1845
1846 enum nl80211_channel_type
1847 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1848 {
1849         enum nl80211_channel_type channel_type;
1850
1851         if (!ht_oper)
1852                 return NL80211_CHAN_NO_HT;
1853
1854         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1855         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1856                 channel_type = NL80211_CHAN_HT20;
1857                 break;
1858         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1859                 channel_type = NL80211_CHAN_HT40PLUS;
1860                 break;
1861         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1862                 channel_type = NL80211_CHAN_HT40MINUS;
1863                 break;
1864         default:
1865                 channel_type = NL80211_CHAN_NO_HT;
1866         }
1867
1868         return channel_type;
1869 }
1870
1871 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1872                             struct sk_buff *skb, bool need_basic,
1873                             enum ieee80211_band band)
1874 {
1875         struct ieee80211_local *local = sdata->local;
1876         struct ieee80211_supported_band *sband;
1877         int rate;
1878         u8 i, rates, *pos;
1879         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1880
1881         sband = local->hw.wiphy->bands[band];
1882         rates = sband->n_bitrates;
1883         if (rates > 8)
1884                 rates = 8;
1885
1886         if (skb_tailroom(skb) < rates + 2)
1887                 return -ENOMEM;
1888
1889         pos = skb_put(skb, rates + 2);
1890         *pos++ = WLAN_EID_SUPP_RATES;
1891         *pos++ = rates;
1892         for (i = 0; i < rates; i++) {
1893                 u8 basic = 0;
1894                 if (need_basic && basic_rates & BIT(i))
1895                         basic = 0x80;
1896                 rate = sband->bitrates[i].bitrate;
1897                 *pos++ = basic | (u8) (rate / 5);
1898         }
1899
1900         return 0;
1901 }
1902
1903 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1904                                 struct sk_buff *skb, bool need_basic,
1905                                 enum ieee80211_band band)
1906 {
1907         struct ieee80211_local *local = sdata->local;
1908         struct ieee80211_supported_band *sband;
1909         int rate;
1910         u8 i, exrates, *pos;
1911         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1912
1913         sband = local->hw.wiphy->bands[band];
1914         exrates = sband->n_bitrates;
1915         if (exrates > 8)
1916                 exrates -= 8;
1917         else
1918                 exrates = 0;
1919
1920         if (skb_tailroom(skb) < exrates + 2)
1921                 return -ENOMEM;
1922
1923         if (exrates) {
1924                 pos = skb_put(skb, exrates + 2);
1925                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1926                 *pos++ = exrates;
1927                 for (i = 8; i < sband->n_bitrates; i++) {
1928                         u8 basic = 0;
1929                         if (need_basic && basic_rates & BIT(i))
1930                                 basic = 0x80;
1931                         rate = sband->bitrates[i].bitrate;
1932                         *pos++ = basic | (u8) (rate / 5);
1933                 }
1934         }
1935         return 0;
1936 }
1937
1938 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1939 {
1940         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1941         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1942
1943         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1944                 /* non-managed type inferfaces */
1945                 return 0;
1946         }
1947         return ifmgd->ave_beacon_signal;
1948 }
1949 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);