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 <net/net_namespace.h>
  24 #include <net/cfg80211.h>
  25 #include <net/rtnetlink.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wme.h"
  32 #include "led.h"
  33 #include "wep.h"
  34
  35 /* privid for wiphys to determine whether they belong to us or not */
  36 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  37
  38 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  39 {
  40         struct ieee80211_local *local;
  41         BUG_ON(!wiphy);
  42
  43         local = wiphy_priv(wiphy);
  44         return &local->hw;
  45 }
  46 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  47
  48 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  49                         enum nl80211_iftype type)
  50 {
  51         __le16 fc = hdr->frame_control;
  52
  53          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  54         if (len < 16)
  55                 return NULL;
  56
  57         if (ieee80211_is_data(fc)) {
  58                 if (len < 24) /* drop incorrect hdr len (data) */
  59                         return NULL;
  60
  61                 if (ieee80211_has_a4(fc))
  62                         return NULL;
  63                 if (ieee80211_has_tods(fc))
  64                         return hdr->addr1;
  65                 if (ieee80211_has_fromds(fc))
  66                         return hdr->addr2;
  67
  68                 return hdr->addr3;
  69         }
  70
  71         if (ieee80211_is_mgmt(fc)) {
  72                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  73                         return NULL;
  74                 return hdr->addr3;
  75         }
  76
  77         if (ieee80211_is_ctl(fc)) {
  78                 if(ieee80211_is_pspoll(fc))
  79                         return hdr->addr1;
  80
  81                 if (ieee80211_is_back_req(fc)) {
  82                         switch (type) {
  83                         case NL80211_IFTYPE_STATION:
  84                                 return hdr->addr2;
  85                         case NL80211_IFTYPE_AP:
  86                         case NL80211_IFTYPE_AP_VLAN:
  87                                 return hdr->addr1;
  88                         default:
  89                                 break; /* fall through to the return */
  90                         }
  91                 }
  92         }
  93
  94         return NULL;
  95 }
  96
  97 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  98 {
  99         struct sk_buff *skb = tx->skb;
 100         struct ieee80211_hdr *hdr;
 101
 102         do {
 103                 hdr = (struct ieee80211_hdr *) skb->data;
 104                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 105         } while ((skb = skb->next));
 106 }
 107
 108 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 109                              int rate, int erp, int short_preamble)
 110 {
 111         int dur;
 112
 113         /* calculate duration (in microseconds, rounded up to next higher
 114          * integer if it includes a fractional microsecond) to send frame of
 115          * len bytes (does not include FCS) at the given rate. Duration will
 116          * also include SIFS.
 117          *
 118          * rate is in 100 kbps, so divident is multiplied by 10 in the
 119          * DIV_ROUND_UP() operations.
 120          */
 121
 122         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 123                 /*
 124                  * OFDM:
 125                  *
 126                  * N_DBPS = DATARATE x 4
 127                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 128                  *      (16 = SIGNAL time, 6 = tail bits)
 129                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 130                  *
 131                  * T_SYM = 4 usec
 132                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 133                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 134                  *      signal ext = 6 usec
 135                  */
 136                 dur = 16; /* SIFS + signal ext */
 137                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 138                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 139                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 140                                         4 * rate); /* T_SYM x N_SYM */
 141         } else {
 142                 /*
 143                  * 802.11b or 802.11g with 802.11b compatibility:
 144                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 145                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 146                  *
 147                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 148                  * aSIFSTime = 10 usec
 149                  * aPreambleLength = 144 usec or 72 usec with short preamble
 150                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 151                  */
 152                 dur = 10; /* aSIFSTime = 10 usec */
 153                 dur += short_preamble ? (72 + 24) : (144 + 48);
 154
 155                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 156         }
 157
 158         return dur;
 159 }
 160
 161 /* Exported duration function for driver use */
 162 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 163                                         struct ieee80211_vif *vif,
 164                                         size_t frame_len,
 165                                         struct ieee80211_rate *rate)
 166 {
 167         struct ieee80211_local *local = hw_to_local(hw);
 168         struct ieee80211_sub_if_data *sdata;
 169         u16 dur;
 170         int erp;
 171         bool short_preamble = false;
 172
 173         erp = 0;
 174         if (vif) {
 175                 sdata = vif_to_sdata(vif);
 176                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 177                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 178                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 179         }
 180
 181         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 182                                        short_preamble);
 183
 184         return cpu_to_le16(dur);
 185 }
 186 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 187
 188 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 189                               struct ieee80211_vif *vif, size_t frame_len,
 190                               const struct ieee80211_tx_info *frame_txctl)
 191 {
 192         struct ieee80211_local *local = hw_to_local(hw);
 193         struct ieee80211_rate *rate;
 194         struct ieee80211_sub_if_data *sdata;
 195         bool short_preamble;
 196         int erp;
 197         u16 dur;
 198         struct ieee80211_supported_band *sband;
 199
 200         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 201
 202         short_preamble = false;
 203
 204         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 205
 206         erp = 0;
 207         if (vif) {
 208                 sdata = vif_to_sdata(vif);
 209                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 210                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 211                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 212         }
 213
 214         /* CTS duration */
 215         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 216                                        erp, short_preamble);
 217         /* Data frame duration */
 218         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 219                                         erp, short_preamble);
 220         /* ACK duration */
 221         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 222                                         erp, short_preamble);
 223
 224         return cpu_to_le16(dur);
 225 }
 226 EXPORT_SYMBOL(ieee80211_rts_duration);
 227
 228 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 229                                     struct ieee80211_vif *vif,
 230                                     size_t frame_len,
 231                                     const struct ieee80211_tx_info *frame_txctl)
 232 {
 233         struct ieee80211_local *local = hw_to_local(hw);
 234         struct ieee80211_rate *rate;
 235         struct ieee80211_sub_if_data *sdata;
 236         bool short_preamble;
 237         int erp;
 238         u16 dur;
 239         struct ieee80211_supported_band *sband;
 240
 241         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 242
 243         short_preamble = false;
 244
 245         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 246         erp = 0;
 247         if (vif) {
 248                 sdata = vif_to_sdata(vif);
 249                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 250                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 251                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 252         }
 253
 254         /* Data frame duration */
 255         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 256                                        erp, short_preamble);
 257         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 258                 /* ACK duration */
 259                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 260                                                 erp, short_preamble);
 261         }
 262
 263         return cpu_to_le16(dur);
 264 }
 265 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 266
 267 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 268                                    enum queue_stop_reason reason)
 269 {
 270         struct ieee80211_local *local = hw_to_local(hw);
 271         struct ieee80211_sub_if_data *sdata;
 272
 273         trace_wake_queue(local, queue, reason);
 274
 275         if (WARN_ON(queue >= hw->queues))
 276                 return;
 277
 278         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 279
 280         if (local->queue_stop_reasons[queue] != 0)
 281                 /* someone still has this queue stopped */
 282                 return;
 283
 284         if (skb_queue_empty(&local->pending[queue])) {
 285                 rcu_read_lock();
 286                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 287                         if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 288                                 continue;
 289                         netif_wake_subqueue(sdata->dev, queue);
 290                 }
 291                 rcu_read_unlock();
 292         } else
 293                 tasklet_schedule(&local->tx_pending_tasklet);
 294 }
 295
 296 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 297                                     enum queue_stop_reason reason)
 298 {
 299         struct ieee80211_local *local = hw_to_local(hw);
 300         unsigned long flags;
 301
 302         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 303         __ieee80211_wake_queue(hw, queue, reason);
 304         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 305 }
 306
 307 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 308 {
 309         ieee80211_wake_queue_by_reason(hw, queue,
 310                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 311 }
 312 EXPORT_SYMBOL(ieee80211_wake_queue);
 313
 314 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 315                                    enum queue_stop_reason reason)
 316 {
 317         struct ieee80211_local *local = hw_to_local(hw);
 318         struct ieee80211_sub_if_data *sdata;
 319
 320         trace_stop_queue(local, queue, reason);
 321
 322         if (WARN_ON(queue >= hw->queues))
 323                 return;
 324
 325         __set_bit(reason, &local->queue_stop_reasons[queue]);
 326
 327         rcu_read_lock();
 328         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 329                 netif_stop_subqueue(sdata->dev, queue);
 330         rcu_read_unlock();
 331 }
 332
 333 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 334                                     enum queue_stop_reason reason)
 335 {
 336         struct ieee80211_local *local = hw_to_local(hw);
 337         unsigned long flags;
 338
 339         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 340         __ieee80211_stop_queue(hw, queue, reason);
 341         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 342 }
 343
 344 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 345 {
 346         ieee80211_stop_queue_by_reason(hw, queue,
 347                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 348 }
 349 EXPORT_SYMBOL(ieee80211_stop_queue);
 350
 351 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 352                                struct sk_buff *skb)
 353 {
 354         struct ieee80211_hw *hw = &local->hw;
 355         unsigned long flags;
 356         int queue = skb_get_queue_mapping(skb);
 357         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 358
 359         if (WARN_ON(!info->control.vif)) {
 360                 kfree_skb(skb);
 361                 return;
 362         }
 363
 364         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 365         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 366         __skb_queue_tail(&local->pending[queue], skb);
 367         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 368         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 369 }
 370
 371 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 372                                    struct sk_buff_head *skbs,
 373                                    void (*fn)(void *data), void *data)
 374 {
 375         struct ieee80211_hw *hw = &local->hw;
 376         struct sk_buff *skb;
 377         unsigned long flags;
 378         int queue, i;
 379
 380         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 381         for (i = 0; i < hw->queues; i++)
 382                 __ieee80211_stop_queue(hw, i,
 383                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 384
 385         while ((skb = skb_dequeue(skbs))) {
 386                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 387
 388                 if (WARN_ON(!info->control.vif)) {
 389                         kfree_skb(skb);
 390                         continue;
 391                 }
 392
 393                 queue = skb_get_queue_mapping(skb);
 394                 __skb_queue_tail(&local->pending[queue], skb);
 395         }
 396
 397         if (fn)
 398                 fn(data);
 399
 400         for (i = 0; i < hw->queues; i++)
 401                 __ieee80211_wake_queue(hw, i,
 402                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 403         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 404 }
 405
 406 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 407                                 struct sk_buff_head *skbs)
 408 {
 409         ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
 410 }
 411
 412 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 413                                     enum queue_stop_reason reason)
 414 {
 415         struct ieee80211_local *local = hw_to_local(hw);
 416         unsigned long flags;
 417         int i;
 418
 419         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 420
 421         for (i = 0; i < hw->queues; i++)
 422                 __ieee80211_stop_queue(hw, i, reason);
 423
 424         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 425 }
 426
 427 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 428 {
 429         ieee80211_stop_queues_by_reason(hw,
 430                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 431 }
 432 EXPORT_SYMBOL(ieee80211_stop_queues);
 433
 434 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 435 {
 436         struct ieee80211_local *local = hw_to_local(hw);
 437         unsigned long flags;
 438         int ret;
 439
 440         if (WARN_ON(queue >= hw->queues))
 441                 return true;
 442
 443         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 444         ret = !!local->queue_stop_reasons[queue];
 445         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 446         return ret;
 447 }
 448 EXPORT_SYMBOL(ieee80211_queue_stopped);
 449
 450 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 451                                      enum queue_stop_reason reason)
 452 {
 453         struct ieee80211_local *local = hw_to_local(hw);
 454         unsigned long flags;
 455         int i;
 456
 457         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 458
 459         for (i = 0; i < hw->queues; i++)
 460                 __ieee80211_wake_queue(hw, i, reason);
 461
 462         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 463 }
 464
 465 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 466 {
 467         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 468 }
 469 EXPORT_SYMBOL(ieee80211_wake_queues);
 470
 471 void ieee80211_iterate_active_interfaces(
 472         struct ieee80211_hw *hw,
 473         void (*iterator)(void *data, u8 *mac,
 474                          struct ieee80211_vif *vif),
 475         void *data)
 476 {
 477         struct ieee80211_local *local = hw_to_local(hw);
 478         struct ieee80211_sub_if_data *sdata;
 479
 480         mutex_lock(&local->iflist_mtx);
 481
 482         list_for_each_entry(sdata, &local->interfaces, list) {
 483                 switch (sdata->vif.type) {
 484                 case NL80211_IFTYPE_MONITOR:
 485                 case NL80211_IFTYPE_AP_VLAN:
 486                         continue;
 487                 default:
 488                         break;
 489                 }
 490                 if (ieee80211_sdata_running(sdata))
 491                         iterator(data, sdata->vif.addr,
 492                                  &sdata->vif);
 493         }
 494
 495         mutex_unlock(&local->iflist_mtx);
 496 }
 497 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 498
 499 void ieee80211_iterate_active_interfaces_atomic(
 500         struct ieee80211_hw *hw,
 501         void (*iterator)(void *data, u8 *mac,
 502                          struct ieee80211_vif *vif),
 503         void *data)
 504 {
 505         struct ieee80211_local *local = hw_to_local(hw);
 506         struct ieee80211_sub_if_data *sdata;
 507
 508         rcu_read_lock();
 509
 510         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 511                 switch (sdata->vif.type) {
 512                 case NL80211_IFTYPE_MONITOR:
 513                 case NL80211_IFTYPE_AP_VLAN:
 514                         continue;
 515                 default:
 516                         break;
 517                 }
 518                 if (ieee80211_sdata_running(sdata))
 519                         iterator(data, sdata->vif.addr,
 520                                  &sdata->vif);
 521         }
 522
 523         rcu_read_unlock();
 524 }
 525 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 526
 527 /*
 528  * Nothing should have been stuffed into the workqueue during
 529  * the suspend->resume cycle. If this WARN is seen then there
 530  * is a bug with either the driver suspend or something in
 531  * mac80211 stuffing into the workqueue which we haven't yet
 532  * cleared during mac80211's suspend cycle.
 533  */
 534 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 535 {
 536         if (WARN(local->suspended && !local->resuming,
 537                  "queueing ieee80211 work while going to suspend\n"))
 538                 return false;
 539
 540         return true;
 541 }
 542
 543 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 544 {
 545         struct ieee80211_local *local = hw_to_local(hw);
 546
 547         if (!ieee80211_can_queue_work(local))
 548                 return;
 549
 550         queue_work(local->workqueue, work);
 551 }
 552 EXPORT_SYMBOL(ieee80211_queue_work);
 553
 554 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 555                                   struct delayed_work *dwork,
 556                                   unsigned long delay)
 557 {
 558         struct ieee80211_local *local = hw_to_local(hw);
 559
 560         if (!ieee80211_can_queue_work(local))
 561                 return;
 562
 563         queue_delayed_work(local->workqueue, dwork, delay);
 564 }
 565 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 566
 567 void ieee802_11_parse_elems(u8 *start, size_t len,
 568                             struct ieee802_11_elems *elems)
 569 {
 570         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 571 }
 572
 573 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 574 {
 575         struct ieee80211_local *local = sdata->local;
 576         struct ieee80211_tx_queue_params qparam;
 577         int queue;
 578         bool use_11b;
 579         int aCWmin, aCWmax;
 580
 581         if (!local->ops->conf_tx)
 582                 return;
 583
 584         memset(&qparam, 0, sizeof(qparam));
 585
 586         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 587                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 588
 589         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 590                 /* Set defaults according to 802.11-2007 Table 7-37 */
 591                 aCWmax = 1023;
 592                 if (use_11b)
 593                         aCWmin = 31;
 594                 else
 595                         aCWmin = 15;
 596
 597                 switch (queue) {
 598                 case 3: /* AC_BK */
 599                         qparam.cw_max = aCWmax;
 600                         qparam.cw_min = aCWmin;
 601                         qparam.txop = 0;
 602                         qparam.aifs = 7;
 603                         break;
 604                 default: /* never happens but let's not leave undefined */
 605                 case 2: /* AC_BE */
 606                         qparam.cw_max = aCWmax;
 607                         qparam.cw_min = aCWmin;
 608                         qparam.txop = 0;
 609                         qparam.aifs = 3;
 610                         break;
 611                 case 1: /* AC_VI */
 612                         qparam.cw_max = aCWmin;
 613                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 614                         if (use_11b)
 615                                 qparam.txop = 6016/32;
 616                         else
 617                                 qparam.txop = 3008/32;
 618                         qparam.aifs = 2;
 619                         break;
 620                 case 0: /* AC_VO */
 621                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 622                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 623                         if (use_11b)
 624                                 qparam.txop = 3264/32;
 625                         else
 626                                 qparam.txop = 1504/32;
 627                         qparam.aifs = 2;
 628                         break;
 629                 }
 630
 631                 qparam.uapsd = false;
 632
 633                 sdata->tx_conf[queue] = qparam;
 634                 drv_conf_tx(local, sdata, queue, &qparam);
 635         }
 636
 637         /* after reinitialize QoS TX queues setting to default,
 638          * disable QoS at all */
 639
 640         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 641                 sdata->vif.bss_conf.qos =
 642                         sdata->vif.type != NL80211_IFTYPE_STATION;
 643                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 644         }
 645 }
 646
 647 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 648                                   const size_t supp_rates_len,
 649                                   const u8 *supp_rates)
 650 {
 651         struct ieee80211_local *local = sdata->local;
 652         int i, have_higher_than_11mbit = 0;
 653
 654         /* cf. IEEE 802.11 9.2.12 */
 655         for (i = 0; i < supp_rates_len; i++)
 656                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 657                         have_higher_than_11mbit = 1;
 658
 659         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 660             have_higher_than_11mbit)
 661                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 662         else
 663                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 664
 665         ieee80211_set_wmm_default(sdata);
 666 }
 667
 668 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 669                               enum ieee80211_band band)
 670 {
 671         struct ieee80211_supported_band *sband;
 672         struct ieee80211_rate *bitrates;
 673         u32 mandatory_rates;
 674         enum ieee80211_rate_flags mandatory_flag;
 675         int i;
 676
 677         sband = local->hw.wiphy->bands[band];
 678         if (!sband) {
 679                 WARN_ON(1);
 680                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 681         }
 682
 683         if (band == IEEE80211_BAND_2GHZ)
 684                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 685         else
 686                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 687
 688         bitrates = sband->bitrates;
 689         mandatory_rates = 0;
 690         for (i = 0; i < sband->n_bitrates; i++)
 691                 if (bitrates[i].flags & mandatory_flag)
 692                         mandatory_rates |= BIT(i);
 693         return mandatory_rates;
 694 }
 695
 696 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 697                          u16 transaction, u16 auth_alg,
 698                          u8 *extra, size_t extra_len, const u8 *bssid,
 699                          const u8 *key, u8 key_len, u8 key_idx)
 700 {
 701         struct ieee80211_local *local = sdata->local;
 702         struct sk_buff *skb;
 703         struct ieee80211_mgmt *mgmt;
 704         int err;
 705
 706         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 707                             sizeof(*mgmt) + 6 + extra_len);
 708         if (!skb)
 709                 return;
 710
 711         skb_reserve(skb, local->hw.extra_tx_headroom);
 712
 713         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 714         memset(mgmt, 0, 24 + 6);
 715         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 716                                           IEEE80211_STYPE_AUTH);
 717         memcpy(mgmt->da, bssid, ETH_ALEN);
 718         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 719         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 720         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 721         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 722         mgmt->u.auth.status_code = cpu_to_le16(0);
 723         if (extra)
 724                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 725
 726         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 727                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 728                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 729                 WARN_ON(err);
 730         }
 731
 732         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 733         ieee80211_tx_skb(sdata, skb);
 734 }
 735
 736 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 737                              const u8 *ie, size_t ie_len,
 738                              enum ieee80211_band band, u32 rate_mask,
 739                              u8 channel)
 740 {
 741         struct ieee80211_supported_band *sband;
 742         u8 *pos;
 743         size_t offset = 0, noffset;
 744         int supp_rates_len, i;
 745         u8 rates[32];
 746         int num_rates;
 747         int ext_rates_len;
 748
 749         sband = local->hw.wiphy->bands[band];
 750
 751         pos = buffer;
 752
 753         num_rates = 0;
 754         for (i = 0; i < sband->n_bitrates; i++) {
 755                 if ((BIT(i) & rate_mask) == 0)
 756                         continue; /* skip rate */
 757                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
 758         }
 759
 760         supp_rates_len = min_t(int, num_rates, 8);
 761
 762         *pos++ = WLAN_EID_SUPP_RATES;
 763         *pos++ = supp_rates_len;
 764         memcpy(pos, rates, supp_rates_len);
 765         pos += supp_rates_len;
 766
 767         /* insert "request information" if in custom IEs */
 768         if (ie && ie_len) {
 769                 static const u8 before_extrates[] = {
 770                         WLAN_EID_SSID,
 771                         WLAN_EID_SUPP_RATES,
 772                         WLAN_EID_REQUEST,
 773                 };
 774                 noffset = ieee80211_ie_split(ie, ie_len,
 775                                              before_extrates,
 776                                              ARRAY_SIZE(before_extrates),
 777                                              offset);
 778                 memcpy(pos, ie + offset, noffset - offset);
 779                 pos += noffset - offset;
 780                 offset = noffset;
 781         }
 782
 783         ext_rates_len = num_rates - supp_rates_len;
 784         if (ext_rates_len > 0) {
 785                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 786                 *pos++ = ext_rates_len;
 787                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
 788                 pos += ext_rates_len;
 789         }
 790
 791         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
 792                 *pos++ = WLAN_EID_DS_PARAMS;
 793                 *pos++ = 1;
 794                 *pos++ = channel;
 795         }
 796
 797         /* insert custom IEs that go before HT */
 798         if (ie && ie_len) {
 799                 static const u8 before_ht[] = {
 800                         WLAN_EID_SSID,
 801                         WLAN_EID_SUPP_RATES,
 802                         WLAN_EID_REQUEST,
 803                         WLAN_EID_EXT_SUPP_RATES,
 804                         WLAN_EID_DS_PARAMS,
 805                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 806                 };
 807                 noffset = ieee80211_ie_split(ie, ie_len,
 808                                              before_ht, ARRAY_SIZE(before_ht),
 809                                              offset);
 810                 memcpy(pos, ie + offset, noffset - offset);
 811                 pos += noffset - offset;
 812                 offset = noffset;
 813         }
 814
 815         if (sband->ht_cap.ht_supported) {
 816                 u16 cap = sband->ht_cap.cap;
 817                 __le16 tmp;
 818
 819                 *pos++ = WLAN_EID_HT_CAPABILITY;
 820                 *pos++ = sizeof(struct ieee80211_ht_cap);
 821                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 822                 tmp = cpu_to_le16(cap);
 823                 memcpy(pos, &tmp, sizeof(u16));
 824                 pos += sizeof(u16);
 825                 *pos++ = sband->ht_cap.ampdu_factor |
 826                          (sband->ht_cap.ampdu_density <<
 827                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
 828                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 829                 pos += sizeof(sband->ht_cap.mcs);
 830                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 831         }
 832
 833         /*
 834          * If adding more here, adjust code in main.c
 835          * that calculates local->scan_ies_len.
 836          */
 837
 838         /* add any remaining custom IEs */
 839         if (ie && ie_len) {
 840                 noffset = ie_len;
 841                 memcpy(pos, ie + offset, noffset - offset);
 842                 pos += noffset - offset;
 843         }
 844
 845         return pos - buffer;
 846 }
 847
 848 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
 849                                           u8 *dst, u32 ratemask,
 850                                           const u8 *ssid, size_t ssid_len,
 851                                           const u8 *ie, size_t ie_len,
 852                                           bool directed)
 853 {
 854         struct ieee80211_local *local = sdata->local;
 855         struct sk_buff *skb;
 856         struct ieee80211_mgmt *mgmt;
 857         size_t buf_len;
 858         u8 *buf;
 859         u8 chan;
 860
 861         /* FIXME: come up with a proper value */
 862         buf = kmalloc(200 + ie_len, GFP_KERNEL);
 863         if (!buf)
 864                 return NULL;
 865
 866         /*
 867          * Do not send DS Channel parameter for directed probe requests
 868          * in order to maximize the chance that we get a response.  Some
 869          * badly-behaved APs don't respond when this parameter is included.
 870          */
 871         if (directed)
 872                 chan = 0;
 873         else
 874                 chan = ieee80211_frequency_to_channel(
 875                         local->hw.conf.channel->center_freq);
 876
 877         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
 878                                            local->hw.conf.channel->band,
 879                                            ratemask, chan);
 880
 881         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
 882                                      ssid, ssid_len,
 883                                      buf, buf_len);
 884         if (!skb)
 885                 goto out;
 886
 887         if (dst) {
 888                 mgmt = (struct ieee80211_mgmt *) skb->data;
 889                 memcpy(mgmt->da, dst, ETH_ALEN);
 890                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 891         }
 892
 893         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 894
 895  out:
 896         kfree(buf);
 897
 898         return skb;
 899 }
 900
 901 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 902                               const u8 *ssid, size_t ssid_len,
 903                               const u8 *ie, size_t ie_len,
 904                               u32 ratemask, bool directed, bool no_cck)
 905 {
 906         struct sk_buff *skb;
 907
 908         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
 909                                         ie, ie_len, directed);
 910         if (skb) {
 911                 if (no_cck)
 912                         IEEE80211_SKB_CB(skb)->flags |=
 913                                 IEEE80211_TX_CTL_NO_CCK_RATE;
 914                 ieee80211_tx_skb(sdata, skb);
 915         }
 916 }
 917
 918 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 919                             struct ieee802_11_elems *elems,
 920                             enum ieee80211_band band)
 921 {
 922         struct ieee80211_supported_band *sband;
 923         struct ieee80211_rate *bitrates;
 924         size_t num_rates;
 925         u32 supp_rates;
 926         int i, j;
 927         sband = local->hw.wiphy->bands[band];
 928
 929         if (!sband) {
 930                 WARN_ON(1);
 931                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 932         }
 933
 934         bitrates = sband->bitrates;
 935         num_rates = sband->n_bitrates;
 936         supp_rates = 0;
 937         for (i = 0; i < elems->supp_rates_len +
 938                      elems->ext_supp_rates_len; i++) {
 939                 u8 rate = 0;
 940                 int own_rate;
 941                 if (i < elems->supp_rates_len)
 942                         rate = elems->supp_rates[i];
 943                 else if (elems->ext_supp_rates)
 944                         rate = elems->ext_supp_rates
 945                                 [i - elems->supp_rates_len];
 946                 own_rate = 5 * (rate & 0x7f);
 947                 for (j = 0; j < num_rates; j++)
 948                         if (bitrates[j].bitrate == own_rate)
 949                                 supp_rates |= BIT(j);
 950         }
 951         return supp_rates;
 952 }
 953
 954 void ieee80211_stop_device(struct ieee80211_local *local)
 955 {
 956         ieee80211_led_radio(local, false);
 957         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
 958
 959         cancel_work_sync(&local->reconfig_filter);
 960
 961         flush_workqueue(local->workqueue);
 962         drv_stop(local);
 963 }
 964
 965 int ieee80211_reconfig(struct ieee80211_local *local)
 966 {
 967         struct ieee80211_hw *hw = &local->hw;
 968         struct ieee80211_sub_if_data *sdata;
 969         struct sta_info *sta;
 970         int res, i;
 971
 972 #ifdef CONFIG_PM
 973         if (local->suspended)
 974                 local->resuming = true;
 975
 976         if (local->wowlan) {
 977                 local->wowlan = false;
 978                 res = drv_resume(local);
 979                 if (res < 0) {
 980                         local->resuming = false;
 981                         return res;
 982                 }
 983                 if (res == 0)
 984                         goto wake_up;
 985                 WARN_ON(res > 1);
 986                 /*
 987                  * res is 1, which means the driver requested
 988                  * to go through a regular reset on wakeup.
 989                  */
 990         }
 991 #endif
 992
 993         /* setup fragmentation threshold */
 994         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
 995
 996         /* setup RTS threshold */
 997         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
 998
 999         /* reset coverage class */
1000         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1001
1002         /* everything else happens only if HW was up & running */
1003         if (!local->open_count)
1004                 goto wake_up;
1005
1006         /*
1007          * Upon resume hardware can sometimes be goofy due to
1008          * various platform / driver / bus issues, so restarting
1009          * the device may at times not work immediately. Propagate
1010          * the error.
1011          */
1012         res = drv_start(local);
1013         if (res) {
1014                 WARN(local->suspended, "Hardware became unavailable "
1015                      "upon resume. This could be a software issue "
1016                      "prior to suspend or a hardware issue.\n");
1017                 return res;
1018         }
1019
1020         ieee80211_led_radio(local, true);
1021         ieee80211_mod_tpt_led_trig(local,
1022                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1023
1024         /* add interfaces */
1025         list_for_each_entry(sdata, &local->interfaces, list) {
1026                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1027                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1028                     ieee80211_sdata_running(sdata))
1029                         res = drv_add_interface(local, &sdata->vif);
1030         }
1031
1032         /* add STAs back */
1033         mutex_lock(&local->sta_mtx);
1034         list_for_each_entry(sta, &local->sta_list, list) {
1035                 if (sta->uploaded) {
1036                         sdata = sta->sdata;
1037                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1038                                 sdata = container_of(sdata->bss,
1039                                              struct ieee80211_sub_if_data,
1040                                              u.ap);
1041
1042                         memset(&sta->sta.drv_priv, 0, hw->sta_data_size);
1043                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1044                 }
1045         }
1046         mutex_unlock(&local->sta_mtx);
1047
1048         /* reconfigure tx conf */
1049         list_for_each_entry(sdata, &local->interfaces, list) {
1050                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1051                     sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1052                     !ieee80211_sdata_running(sdata))
1053                         continue;
1054
1055                 for (i = 0; i < hw->queues; i++)
1056                         drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1057         }
1058
1059         /* reconfigure hardware */
1060         ieee80211_hw_config(local, ~0);
1061
1062         ieee80211_configure_filter(local);
1063
1064         /* Finally also reconfigure all the BSS information */
1065         list_for_each_entry(sdata, &local->interfaces, list) {
1066                 u32 changed;
1067
1068                 if (!ieee80211_sdata_running(sdata))
1069                         continue;
1070
1071                 /* common change flags for all interface types */
1072                 changed = BSS_CHANGED_ERP_CTS_PROT |
1073                           BSS_CHANGED_ERP_PREAMBLE |
1074                           BSS_CHANGED_ERP_SLOT |
1075                           BSS_CHANGED_HT |
1076                           BSS_CHANGED_BASIC_RATES |
1077                           BSS_CHANGED_BEACON_INT |
1078                           BSS_CHANGED_BSSID |
1079                           BSS_CHANGED_CQM |
1080                           BSS_CHANGED_QOS;
1081
1082                 switch (sdata->vif.type) {
1083                 case NL80211_IFTYPE_STATION:
1084                         changed |= BSS_CHANGED_ASSOC;
1085                         mutex_lock(&sdata->u.mgd.mtx);
1086                         ieee80211_bss_info_change_notify(sdata, changed);
1087                         mutex_unlock(&sdata->u.mgd.mtx);
1088                         break;
1089                 case NL80211_IFTYPE_ADHOC:
1090                         changed |= BSS_CHANGED_IBSS;
1091                         /* fall through */
1092                 case NL80211_IFTYPE_AP:
1093                         changed |= BSS_CHANGED_SSID;
1094                         /* fall through */
1095                 case NL80211_IFTYPE_MESH_POINT:
1096                         changed |= BSS_CHANGED_BEACON |
1097                                    BSS_CHANGED_BEACON_ENABLED;
1098                         ieee80211_bss_info_change_notify(sdata, changed);
1099                         break;
1100                 case NL80211_IFTYPE_WDS:
1101                         break;
1102                 case NL80211_IFTYPE_AP_VLAN:
1103                 case NL80211_IFTYPE_MONITOR:
1104                         /* ignore virtual */
1105                         break;
1106                 case NL80211_IFTYPE_UNSPECIFIED:
1107                 case NUM_NL80211_IFTYPES:
1108                 case NL80211_IFTYPE_P2P_CLIENT:
1109                 case NL80211_IFTYPE_P2P_GO:
1110                         WARN_ON(1);
1111                         break;
1112                 }
1113         }
1114
1115         /*
1116          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1117          * sessions can be established after a resume.
1118          *
1119          * Also tear down aggregation sessions since reconfiguring
1120          * them in a hardware restart scenario is not easily done
1121          * right now, and the hardware will have lost information
1122          * about the sessions, but we and the AP still think they
1123          * are active. This is really a workaround though.
1124          */
1125         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1126                 mutex_lock(&local->sta_mtx);
1127
1128                 list_for_each_entry(sta, &local->sta_list, list) {
1129                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1130                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1131                 }
1132
1133                 mutex_unlock(&local->sta_mtx);
1134         }
1135
1136         /* add back keys */
1137         list_for_each_entry(sdata, &local->interfaces, list)
1138                 if (ieee80211_sdata_running(sdata))
1139                         ieee80211_enable_keys(sdata);
1140
1141  wake_up:
1142         ieee80211_wake_queues_by_reason(hw,
1143                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1144
1145         /*
1146          * If this is for hw restart things are still running.
1147          * We may want to change that later, however.
1148          */
1149         if (!local->suspended)
1150                 return 0;
1151
1152 #ifdef CONFIG_PM
1153         /* first set suspended false, then resuming */
1154         local->suspended = false;
1155         mb();
1156         local->resuming = false;
1157
1158         list_for_each_entry(sdata, &local->interfaces, list) {
1159                 switch(sdata->vif.type) {
1160                 case NL80211_IFTYPE_STATION:
1161                         ieee80211_sta_restart(sdata);
1162                         break;
1163                 case NL80211_IFTYPE_ADHOC:
1164                         ieee80211_ibss_restart(sdata);
1165                         break;
1166                 case NL80211_IFTYPE_MESH_POINT:
1167                         ieee80211_mesh_restart(sdata);
1168                         break;
1169                 default:
1170                         break;
1171                 }
1172         }
1173
1174         mod_timer(&local->sta_cleanup, jiffies + 1);
1175
1176         mutex_lock(&local->sta_mtx);
1177         list_for_each_entry(sta, &local->sta_list, list)
1178                 mesh_plink_restart(sta);
1179         mutex_unlock(&local->sta_mtx);
1180 #else
1181         WARN_ON(1);
1182 #endif
1183         return 0;
1184 }
1185
1186 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1187 {
1188         struct ieee80211_sub_if_data *sdata;
1189         struct ieee80211_local *local;
1190         struct ieee80211_key *key;
1191
1192         if (WARN_ON(!vif))
1193                 return;
1194
1195         sdata = vif_to_sdata(vif);
1196         local = sdata->local;
1197
1198         if (WARN_ON(!local->resuming))
1199                 return;
1200
1201         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1202                 return;
1203
1204         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1205
1206         mutex_lock(&local->key_mtx);
1207         list_for_each_entry(key, &sdata->key_list, list)
1208                 key->flags |= KEY_FLAG_TAINTED;
1209         mutex_unlock(&local->key_mtx);
1210 }
1211 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1212
1213 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1214                           enum ieee80211_smps_mode *smps_mode)
1215 {
1216         if (ifmgd->associated) {
1217                 *smps_mode = ifmgd->ap_smps;
1218
1219                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1220                         if (ifmgd->powersave)
1221                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1222                         else
1223                                 *smps_mode = IEEE80211_SMPS_OFF;
1224                 }
1225
1226                 return 1;
1227         }
1228
1229         return 0;
1230 }
1231
1232 /* must hold iflist_mtx */
1233 void ieee80211_recalc_smps(struct ieee80211_local *local)
1234 {
1235         struct ieee80211_sub_if_data *sdata;
1236         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1237         int count = 0;
1238
1239         lockdep_assert_held(&local->iflist_mtx);
1240
1241         /*
1242          * This function could be improved to handle multiple
1243          * interfaces better, but right now it makes any
1244          * non-station interfaces force SM PS to be turned
1245          * off. If there are multiple station interfaces it
1246          * could also use the best possible mode, e.g. if
1247          * one is in static and the other in dynamic then
1248          * dynamic is ok.
1249          */
1250
1251         list_for_each_entry(sdata, &local->interfaces, list) {
1252                 if (!ieee80211_sdata_running(sdata))
1253                         continue;
1254                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1255                         goto set;
1256
1257                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1258
1259                 if (count > 1) {
1260                         smps_mode = IEEE80211_SMPS_OFF;
1261                         break;
1262                 }
1263         }
1264
1265         if (smps_mode == local->smps_mode)
1266                 return;
1267
1268  set:
1269         local->smps_mode = smps_mode;
1270         /* changed flag is auto-detected for this */
1271         ieee80211_hw_config(local, 0);
1272 }
1273
1274 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1275 {
1276         int i;
1277
1278         for (i = 0; i < n_ids; i++)
1279                 if (ids[i] == id)
1280                         return true;
1281         return false;
1282 }
1283
1284 /**
1285  * ieee80211_ie_split - split an IE buffer according to ordering
1286  *
1287  * @ies: the IE buffer
1288  * @ielen: the length of the IE buffer
1289  * @ids: an array with element IDs that are allowed before
1290  *      the split
1291  * @n_ids: the size of the element ID array
1292  * @offset: offset where to start splitting in the buffer
1293  *
1294  * This function splits an IE buffer by updating the @offset
1295  * variable to point to the location where the buffer should be
1296  * split.
1297  *
1298  * It assumes that the given IE buffer is well-formed, this
1299  * has to be guaranteed by the caller!
1300  *
1301  * It also assumes that the IEs in the buffer are ordered
1302  * correctly, if not the result of using this function will not
1303  * be ordered correctly either, i.e. it does no reordering.
1304  *
1305  * The function returns the offset where the next part of the
1306  * buffer starts, which may be @ielen if the entire (remainder)
1307  * of the buffer should be used.
1308  */
1309 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1310                           const u8 *ids, int n_ids, size_t offset)
1311 {
1312         size_t pos = offset;
1313
1314         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1315                 pos += 2 + ies[pos + 1];
1316
1317         return pos;
1318 }
1319
1320 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1321 {
1322         size_t pos = offset;
1323
1324         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1325                 pos += 2 + ies[pos + 1];
1326
1327         return pos;
1328 }
1329
1330 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1331                                             int rssi_min_thold,
1332                                             int rssi_max_thold)
1333 {
1334         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1335
1336         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1337                 return;
1338
1339         /*
1340          * Scale up threshold values before storing it, as the RSSI averaging
1341          * algorithm uses a scaled up value as well. Change this scaling
1342          * factor if the RSSI averaging algorithm changes.
1343          */
1344         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1345         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1346 }
1347
1348 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1349                                     int rssi_min_thold,
1350                                     int rssi_max_thold)
1351 {
1352         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1353
1354         WARN_ON(rssi_min_thold == rssi_max_thold ||
1355                 rssi_min_thold > rssi_max_thold);
1356
1357         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1358                                        rssi_max_thold);
1359 }
1360 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1361
1362 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1363 {
1364         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1365
1366         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1367 }
1368 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1369
1370 int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1371 {
1372         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1373         struct ieee80211_local *local = sdata->local;
1374         struct ieee80211_supported_band *sband;
1375         int rate;
1376         u8 i, rates, *pos;
1377
1378         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1379         rates = sband->n_bitrates;
1380         if (rates > 8)
1381                 rates = 8;
1382
1383         if (skb_tailroom(skb) < rates + 2)
1384                 return -ENOMEM;
1385
1386         pos = skb_put(skb, rates + 2);
1387         *pos++ = WLAN_EID_SUPP_RATES;
1388         *pos++ = rates;
1389         for (i = 0; i < rates; i++) {
1390                 rate = sband->bitrates[i].bitrate;
1391                 *pos++ = (u8) (rate / 5);
1392         }
1393
1394         return 0;
1395 }
1396
1397 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1398 {
1399         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1400         struct ieee80211_local *local = sdata->local;
1401         struct ieee80211_supported_band *sband;
1402         int rate;
1403         u8 i, exrates, *pos;
1404
1405         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1406         exrates = sband->n_bitrates;
1407         if (exrates > 8)
1408                 exrates -= 8;
1409         else
1410                 exrates = 0;
1411
1412         if (skb_tailroom(skb) < exrates + 2)
1413                 return -ENOMEM;
1414
1415         if (exrates) {
1416                 pos = skb_put(skb, exrates + 2);
1417                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1418                 *pos++ = exrates;
1419                 for (i = 8; i < sband->n_bitrates; i++) {
1420                         rate = sband->bitrates[i].bitrate;
1421                         *pos++ = (u8) (rate / 5);
1422                 }
1423         }
1424         return 0;
1425 }