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, u32 iter_flags,
 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 (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 534                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 535                         continue;
 536                 if (ieee80211_sdata_running(sdata))
 537                         iterator(data, sdata->vif.addr,
 538                                  &sdata->vif);
 539         }
 540
 541         sdata = rcu_dereference_protected(local->monitor_sdata,
 542                                           lockdep_is_held(&local->iflist_mtx));
 543         if (sdata &&
 544             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 545              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 546                 iterator(data, sdata->vif.addr, &sdata->vif);
 547
 548         mutex_unlock(&local->iflist_mtx);
 549 }
 550 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 551
 552 void ieee80211_iterate_active_interfaces_atomic(
 553         struct ieee80211_hw *hw, u32 iter_flags,
 554         void (*iterator)(void *data, u8 *mac,
 555                          struct ieee80211_vif *vif),
 556         void *data)
 557 {
 558         struct ieee80211_local *local = hw_to_local(hw);
 559         struct ieee80211_sub_if_data *sdata;
 560
 561         rcu_read_lock();
 562
 563         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 564                 switch (sdata->vif.type) {
 565                 case NL80211_IFTYPE_MONITOR:
 566                 case NL80211_IFTYPE_AP_VLAN:
 567                         continue;
 568                 default:
 569                         break;
 570                 }
 571                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 572                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 573                         continue;
 574                 if (ieee80211_sdata_running(sdata))
 575                         iterator(data, sdata->vif.addr,
 576                                  &sdata->vif);
 577         }
 578
 579         sdata = rcu_dereference(local->monitor_sdata);
 580         if (sdata &&
 581             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 582              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 583                 iterator(data, sdata->vif.addr, &sdata->vif);
 584
 585         rcu_read_unlock();
 586 }
 587 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 588
 589 /*
 590  * Nothing should have been stuffed into the workqueue during
 591  * the suspend->resume cycle. If this WARN is seen then there
 592  * is a bug with either the driver suspend or something in
 593  * mac80211 stuffing into the workqueue which we haven't yet
 594  * cleared during mac80211's suspend cycle.
 595  */
 596 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 597 {
 598         if (WARN(local->suspended && !local->resuming,
 599                  "queueing ieee80211 work while going to suspend\n"))
 600                 return false;
 601
 602         return true;
 603 }
 604
 605 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 606 {
 607         struct ieee80211_local *local = hw_to_local(hw);
 608
 609         if (!ieee80211_can_queue_work(local))
 610                 return;
 611
 612         queue_work(local->workqueue, work);
 613 }
 614 EXPORT_SYMBOL(ieee80211_queue_work);
 615
 616 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 617                                   struct delayed_work *dwork,
 618                                   unsigned long delay)
 619 {
 620         struct ieee80211_local *local = hw_to_local(hw);
 621
 622         if (!ieee80211_can_queue_work(local))
 623                 return;
 624
 625         queue_delayed_work(local->workqueue, dwork, delay);
 626 }
 627 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 628
 629 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 630                                struct ieee802_11_elems *elems,
 631                                u64 filter, u32 crc)
 632 {
 633         size_t left = len;
 634         u8 *pos = start;
 635         bool calc_crc = filter != 0;
 636         DECLARE_BITMAP(seen_elems, 256);
 637
 638         bitmap_zero(seen_elems, 256);
 639         memset(elems, 0, sizeof(*elems));
 640         elems->ie_start = start;
 641         elems->total_len = len;
 642
 643         while (left >= 2) {
 644                 u8 id, elen;
 645                 bool elem_parse_failed;
 646
 647                 id = *pos++;
 648                 elen = *pos++;
 649                 left -= 2;
 650
 651                 if (elen > left) {
 652                         elems->parse_error = true;
 653                         break;
 654                 }
 655
 656                 switch (id) {
 657                 case WLAN_EID_SSID:
 658                 case WLAN_EID_SUPP_RATES:
 659                 case WLAN_EID_FH_PARAMS:
 660                 case WLAN_EID_DS_PARAMS:
 661                 case WLAN_EID_CF_PARAMS:
 662                 case WLAN_EID_TIM:
 663                 case WLAN_EID_IBSS_PARAMS:
 664                 case WLAN_EID_CHALLENGE:
 665                 case WLAN_EID_RSN:
 666                 case WLAN_EID_ERP_INFO:
 667                 case WLAN_EID_EXT_SUPP_RATES:
 668                 case WLAN_EID_HT_CAPABILITY:
 669                 case WLAN_EID_HT_OPERATION:
 670                 case WLAN_EID_VHT_CAPABILITY:
 671                 case WLAN_EID_VHT_OPERATION:
 672                 case WLAN_EID_MESH_ID:
 673                 case WLAN_EID_MESH_CONFIG:
 674                 case WLAN_EID_PEER_MGMT:
 675                 case WLAN_EID_PREQ:
 676                 case WLAN_EID_PREP:
 677                 case WLAN_EID_PERR:
 678                 case WLAN_EID_RANN:
 679                 case WLAN_EID_CHANNEL_SWITCH:
 680                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 681                 case WLAN_EID_COUNTRY:
 682                 case WLAN_EID_PWR_CONSTRAINT:
 683                 case WLAN_EID_TIMEOUT_INTERVAL:
 684                         if (test_bit(id, seen_elems)) {
 685                                 elems->parse_error = true;
 686                                 left -= elen;
 687                                 pos += elen;
 688                                 continue;
 689                         }
 690                         break;
 691                 }
 692
 693                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 694                         crc = crc32_be(crc, pos - 2, elen + 2);
 695
 696                 elem_parse_failed = false;
 697
 698                 switch (id) {
 699                 case WLAN_EID_SSID:
 700                         elems->ssid = pos;
 701                         elems->ssid_len = elen;
 702                         break;
 703                 case WLAN_EID_SUPP_RATES:
 704                         elems->supp_rates = pos;
 705                         elems->supp_rates_len = elen;
 706                         break;
 707                 case WLAN_EID_FH_PARAMS:
 708                         elems->fh_params = pos;
 709                         elems->fh_params_len = elen;
 710                         break;
 711                 case WLAN_EID_DS_PARAMS:
 712                         elems->ds_params = pos;
 713                         elems->ds_params_len = elen;
 714                         break;
 715                 case WLAN_EID_CF_PARAMS:
 716                         elems->cf_params = pos;
 717                         elems->cf_params_len = elen;
 718                         break;
 719                 case WLAN_EID_TIM:
 720                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 721                                 elems->tim = (void *)pos;
 722                                 elems->tim_len = elen;
 723                         } else
 724                                 elem_parse_failed = true;
 725                         break;
 726                 case WLAN_EID_IBSS_PARAMS:
 727                         elems->ibss_params = pos;
 728                         elems->ibss_params_len = elen;
 729                         break;
 730                 case WLAN_EID_CHALLENGE:
 731                         elems->challenge = pos;
 732                         elems->challenge_len = elen;
 733                         break;
 734                 case WLAN_EID_VENDOR_SPECIFIC:
 735                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 736                             pos[2] == 0xf2) {
 737                                 /* Microsoft OUI (00:50:F2) */
 738
 739                                 if (calc_crc)
 740                                         crc = crc32_be(crc, pos - 2, elen + 2);
 741
 742                                 if (pos[3] == 1) {
 743                                         /* OUI Type 1 - WPA IE */
 744                                         elems->wpa = pos;
 745                                         elems->wpa_len = elen;
 746                                 } else if (elen >= 5 && pos[3] == 2) {
 747                                         /* OUI Type 2 - WMM IE */
 748                                         if (pos[4] == 0) {
 749                                                 elems->wmm_info = pos;
 750                                                 elems->wmm_info_len = elen;
 751                                         } else if (pos[4] == 1) {
 752                                                 elems->wmm_param = pos;
 753                                                 elems->wmm_param_len = elen;
 754                                         }
 755                                 }
 756                         }
 757                         break;
 758                 case WLAN_EID_RSN:
 759                         elems->rsn = pos;
 760                         elems->rsn_len = elen;
 761                         break;
 762                 case WLAN_EID_ERP_INFO:
 763                         elems->erp_info = pos;
 764                         elems->erp_info_len = elen;
 765                         break;
 766                 case WLAN_EID_EXT_SUPP_RATES:
 767                         elems->ext_supp_rates = pos;
 768                         elems->ext_supp_rates_len = elen;
 769                         break;
 770                 case WLAN_EID_HT_CAPABILITY:
 771                         if (elen >= sizeof(struct ieee80211_ht_cap))
 772                                 elems->ht_cap_elem = (void *)pos;
 773                         else
 774                                 elem_parse_failed = true;
 775                         break;
 776                 case WLAN_EID_HT_OPERATION:
 777                         if (elen >= sizeof(struct ieee80211_ht_operation))
 778                                 elems->ht_operation = (void *)pos;
 779                         else
 780                                 elem_parse_failed = true;
 781                         break;
 782                 case WLAN_EID_VHT_CAPABILITY:
 783                         if (elen >= sizeof(struct ieee80211_vht_cap))
 784                                 elems->vht_cap_elem = (void *)pos;
 785                         else
 786                                 elem_parse_failed = true;
 787                         break;
 788                 case WLAN_EID_VHT_OPERATION:
 789                         if (elen >= sizeof(struct ieee80211_vht_operation))
 790                                 elems->vht_operation = (void *)pos;
 791                         else
 792                                 elem_parse_failed = true;
 793                         break;
 794                 case WLAN_EID_MESH_ID:
 795                         elems->mesh_id = pos;
 796                         elems->mesh_id_len = elen;
 797                         break;
 798                 case WLAN_EID_MESH_CONFIG:
 799                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 800                                 elems->mesh_config = (void *)pos;
 801                         else
 802                                 elem_parse_failed = true;
 803                         break;
 804                 case WLAN_EID_PEER_MGMT:
 805                         elems->peering = pos;
 806                         elems->peering_len = elen;
 807                         break;
 808                 case WLAN_EID_PREQ:
 809                         elems->preq = pos;
 810                         elems->preq_len = elen;
 811                         break;
 812                 case WLAN_EID_PREP:
 813                         elems->prep = pos;
 814                         elems->prep_len = elen;
 815                         break;
 816                 case WLAN_EID_PERR:
 817                         elems->perr = pos;
 818                         elems->perr_len = elen;
 819                         break;
 820                 case WLAN_EID_RANN:
 821                         if (elen >= sizeof(struct ieee80211_rann_ie))
 822                                 elems->rann = (void *)pos;
 823                         else
 824                                 elem_parse_failed = true;
 825                         break;
 826                 case WLAN_EID_CHANNEL_SWITCH:
 827                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 828                                 elem_parse_failed = true;
 829                                 break;
 830                         }
 831                         elems->ch_switch_ie = (void *)pos;
 832                         break;
 833                 case WLAN_EID_QUIET:
 834                         if (!elems->quiet_elem) {
 835                                 elems->quiet_elem = pos;
 836                                 elems->quiet_elem_len = elen;
 837                         }
 838                         elems->num_of_quiet_elem++;
 839                         break;
 840                 case WLAN_EID_COUNTRY:
 841                         elems->country_elem = pos;
 842                         elems->country_elem_len = elen;
 843                         break;
 844                 case WLAN_EID_PWR_CONSTRAINT:
 845                         if (elen != 1) {
 846                                 elem_parse_failed = true;
 847                                 break;
 848                         }
 849                         elems->pwr_constr_elem = pos;
 850                         break;
 851                 case WLAN_EID_TIMEOUT_INTERVAL:
 852                         elems->timeout_int = pos;
 853                         elems->timeout_int_len = elen;
 854                         break;
 855                 default:
 856                         break;
 857                 }
 858
 859                 if (elem_parse_failed)
 860                         elems->parse_error = true;
 861                 else
 862                         __set_bit(id, seen_elems);
 863
 864                 left -= elen;
 865                 pos += elen;
 866         }
 867
 868         if (left != 0)
 869                 elems->parse_error = true;
 870
 871         return crc;
 872 }
 873
 874 void ieee802_11_parse_elems(u8 *start, size_t len,
 875                             struct ieee802_11_elems *elems)
 876 {
 877         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 878 }
 879
 880 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 881                                bool bss_notify)
 882 {
 883         struct ieee80211_local *local = sdata->local;
 884         struct ieee80211_tx_queue_params qparam;
 885         struct ieee80211_chanctx_conf *chanctx_conf;
 886         int ac;
 887         bool use_11b, enable_qos;
 888         int aCWmin, aCWmax;
 889
 890         if (!local->ops->conf_tx)
 891                 return;
 892
 893         if (local->hw.queues < IEEE80211_NUM_ACS)
 894                 return;
 895
 896         memset(&qparam, 0, sizeof(qparam));
 897
 898         rcu_read_lock();
 899         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 900         use_11b = (chanctx_conf &&
 901                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
 902                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 903         rcu_read_unlock();
 904
 905         /*
 906          * By default disable QoS in STA mode for old access points, which do
 907          * not support 802.11e. New APs will provide proper queue parameters,
 908          * that we will configure later.
 909          */
 910         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 911
 912         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 913                 /* Set defaults according to 802.11-2007 Table 7-37 */
 914                 aCWmax = 1023;
 915                 if (use_11b)
 916                         aCWmin = 31;
 917                 else
 918                         aCWmin = 15;
 919
 920                 if (enable_qos) {
 921                         switch (ac) {
 922                         case IEEE80211_AC_BK:
 923                                 qparam.cw_max = aCWmax;
 924                                 qparam.cw_min = aCWmin;
 925                                 qparam.txop = 0;
 926                                 qparam.aifs = 7;
 927                                 break;
 928                         /* never happens but let's not leave undefined */
 929                         default:
 930                         case IEEE80211_AC_BE:
 931                                 qparam.cw_max = aCWmax;
 932                                 qparam.cw_min = aCWmin;
 933                                 qparam.txop = 0;
 934                                 qparam.aifs = 3;
 935                                 break;
 936                         case IEEE80211_AC_VI:
 937                                 qparam.cw_max = aCWmin;
 938                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 939                                 if (use_11b)
 940                                         qparam.txop = 6016/32;
 941                                 else
 942                                         qparam.txop = 3008/32;
 943                                 qparam.aifs = 2;
 944                                 break;
 945                         case IEEE80211_AC_VO:
 946                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 947                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 948                                 if (use_11b)
 949                                         qparam.txop = 3264/32;
 950                                 else
 951                                         qparam.txop = 1504/32;
 952                                 qparam.aifs = 2;
 953                                 break;
 954                         }
 955                 } else {
 956                         /* Confiure old 802.11b/g medium access rules. */
 957                         qparam.cw_max = aCWmax;
 958                         qparam.cw_min = aCWmin;
 959                         qparam.txop = 0;
 960                         qparam.aifs = 2;
 961                 }
 962
 963                 qparam.uapsd = false;
 964
 965                 sdata->tx_conf[ac] = qparam;
 966                 drv_conf_tx(local, sdata, ac, &qparam);
 967         }
 968
 969         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 970             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 971                 sdata->vif.bss_conf.qos = enable_qos;
 972                 if (bss_notify)
 973                         ieee80211_bss_info_change_notify(sdata,
 974                                                          BSS_CHANGED_QOS);
 975         }
 976 }
 977
 978 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 979                                   const size_t supp_rates_len,
 980                                   const u8 *supp_rates)
 981 {
 982         struct ieee80211_chanctx_conf *chanctx_conf;
 983         int i, have_higher_than_11mbit = 0;
 984
 985         /* cf. IEEE 802.11 9.2.12 */
 986         for (i = 0; i < supp_rates_len; i++)
 987                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 988                         have_higher_than_11mbit = 1;
 989
 990         rcu_read_lock();
 991         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 992
 993         if (chanctx_conf &&
 994             chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ &&
 995             have_higher_than_11mbit)
 996                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 997         else
 998                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 999         rcu_read_unlock();
1000
1001         ieee80211_set_wmm_default(sdata, true);
1002 }
1003
1004 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
1005                               enum ieee80211_band band)
1006 {
1007         struct ieee80211_supported_band *sband;
1008         struct ieee80211_rate *bitrates;
1009         u32 mandatory_rates;
1010         enum ieee80211_rate_flags mandatory_flag;
1011         int i;
1012
1013         sband = local->hw.wiphy->bands[band];
1014         if (WARN_ON(!sband))
1015                 return 1;
1016
1017         if (band == IEEE80211_BAND_2GHZ)
1018                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
1019         else
1020                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
1021
1022         bitrates = sband->bitrates;
1023         mandatory_rates = 0;
1024         for (i = 0; i < sband->n_bitrates; i++)
1025                 if (bitrates[i].flags & mandatory_flag)
1026                         mandatory_rates |= BIT(i);
1027         return mandatory_rates;
1028 }
1029
1030 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1031                          u16 transaction, u16 auth_alg, u16 status,
1032                          u8 *extra, size_t extra_len, const u8 *da,
1033                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
1034 {
1035         struct ieee80211_local *local = sdata->local;
1036         struct sk_buff *skb;
1037         struct ieee80211_mgmt *mgmt;
1038         int err;
1039
1040         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1041                             sizeof(*mgmt) + 6 + extra_len);
1042         if (!skb)
1043                 return;
1044
1045         skb_reserve(skb, local->hw.extra_tx_headroom);
1046
1047         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1048         memset(mgmt, 0, 24 + 6);
1049         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1050                                           IEEE80211_STYPE_AUTH);
1051         memcpy(mgmt->da, da, ETH_ALEN);
1052         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1053         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1054         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1055         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1056         mgmt->u.auth.status_code = cpu_to_le16(status);
1057         if (extra)
1058                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1059
1060         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1061                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1062                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1063                 WARN_ON(err);
1064         }
1065
1066         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1067         ieee80211_tx_skb(sdata, skb);
1068 }
1069
1070 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1071                                     const u8 *bssid, u16 stype, u16 reason,
1072                                     bool send_frame, u8 *frame_buf)
1073 {
1074         struct ieee80211_local *local = sdata->local;
1075         struct sk_buff *skb;
1076         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1077
1078         /* build frame */
1079         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1080         mgmt->duration = 0; /* initialize only */
1081         mgmt->seq_ctrl = 0; /* initialize only */
1082         memcpy(mgmt->da, bssid, ETH_ALEN);
1083         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1084         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1085         /* u.deauth.reason_code == u.disassoc.reason_code */
1086         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1087
1088         if (send_frame) {
1089                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1090                                     IEEE80211_DEAUTH_FRAME_LEN);
1091                 if (!skb)
1092                         return;
1093
1094                 skb_reserve(skb, local->hw.extra_tx_headroom);
1095
1096                 /* copy in frame */
1097                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1098                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1099
1100                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1101                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1102                         IEEE80211_SKB_CB(skb)->flags |=
1103                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1104
1105                 ieee80211_tx_skb(sdata, skb);
1106         }
1107 }
1108
1109 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1110                              size_t buffer_len, const u8 *ie, size_t ie_len,
1111                              enum ieee80211_band band, u32 rate_mask,
1112                              u8 channel)
1113 {
1114         struct ieee80211_supported_band *sband;
1115         u8 *pos = buffer, *end = buffer + buffer_len;
1116         size_t offset = 0, noffset;
1117         int supp_rates_len, i;
1118         u8 rates[32];
1119         int num_rates;
1120         int ext_rates_len;
1121
1122         sband = local->hw.wiphy->bands[band];
1123         if (WARN_ON_ONCE(!sband))
1124                 return 0;
1125
1126         num_rates = 0;
1127         for (i = 0; i < sband->n_bitrates; i++) {
1128                 if ((BIT(i) & rate_mask) == 0)
1129                         continue; /* skip rate */
1130                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1131         }
1132
1133         supp_rates_len = min_t(int, num_rates, 8);
1134
1135         if (end - pos < 2 + supp_rates_len)
1136                 goto out_err;
1137         *pos++ = WLAN_EID_SUPP_RATES;
1138         *pos++ = supp_rates_len;
1139         memcpy(pos, rates, supp_rates_len);
1140         pos += supp_rates_len;
1141
1142         /* insert "request information" if in custom IEs */
1143         if (ie && ie_len) {
1144                 static const u8 before_extrates[] = {
1145                         WLAN_EID_SSID,
1146                         WLAN_EID_SUPP_RATES,
1147                         WLAN_EID_REQUEST,
1148                 };
1149                 noffset = ieee80211_ie_split(ie, ie_len,
1150                                              before_extrates,
1151                                              ARRAY_SIZE(before_extrates),
1152                                              offset);
1153                 if (end - pos < noffset - offset)
1154                         goto out_err;
1155                 memcpy(pos, ie + offset, noffset - offset);
1156                 pos += noffset - offset;
1157                 offset = noffset;
1158         }
1159
1160         ext_rates_len = num_rates - supp_rates_len;
1161         if (ext_rates_len > 0) {
1162                 if (end - pos < 2 + ext_rates_len)
1163                         goto out_err;
1164                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1165                 *pos++ = ext_rates_len;
1166                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1167                 pos += ext_rates_len;
1168         }
1169
1170         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1171                 if (end - pos < 3)
1172                         goto out_err;
1173                 *pos++ = WLAN_EID_DS_PARAMS;
1174                 *pos++ = 1;
1175                 *pos++ = channel;
1176         }
1177
1178         /* insert custom IEs that go before HT */
1179         if (ie && ie_len) {
1180                 static const u8 before_ht[] = {
1181                         WLAN_EID_SSID,
1182                         WLAN_EID_SUPP_RATES,
1183                         WLAN_EID_REQUEST,
1184                         WLAN_EID_EXT_SUPP_RATES,
1185                         WLAN_EID_DS_PARAMS,
1186                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1187                 };
1188                 noffset = ieee80211_ie_split(ie, ie_len,
1189                                              before_ht, ARRAY_SIZE(before_ht),
1190                                              offset);
1191                 if (end - pos < noffset - offset)
1192                         goto out_err;
1193                 memcpy(pos, ie + offset, noffset - offset);
1194                 pos += noffset - offset;
1195                 offset = noffset;
1196         }
1197
1198         if (sband->ht_cap.ht_supported) {
1199                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1200                         goto out_err;
1201                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1202                                                 sband->ht_cap.cap);
1203         }
1204
1205         /*
1206          * If adding more here, adjust code in main.c
1207          * that calculates local->scan_ies_len.
1208          */
1209
1210         /* add any remaining custom IEs */
1211         if (ie && ie_len) {
1212                 noffset = ie_len;
1213                 if (end - pos < noffset - offset)
1214                         goto out_err;
1215                 memcpy(pos, ie + offset, noffset - offset);
1216                 pos += noffset - offset;
1217         }
1218
1219         if (sband->vht_cap.vht_supported) {
1220                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1221                         goto out_err;
1222                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1223                                                  sband->vht_cap.cap);
1224         }
1225
1226         return pos - buffer;
1227  out_err:
1228         WARN_ONCE(1, "not enough space for preq IEs\n");
1229         return pos - buffer;
1230 }
1231
1232 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1233                                           u8 *dst, u32 ratemask,
1234                                           struct ieee80211_channel *chan,
1235                                           const u8 *ssid, size_t ssid_len,
1236                                           const u8 *ie, size_t ie_len,
1237                                           bool directed)
1238 {
1239         struct ieee80211_local *local = sdata->local;
1240         struct sk_buff *skb;
1241         struct ieee80211_mgmt *mgmt;
1242         u8 chan_no;
1243         int ies_len;
1244
1245         /*
1246          * Do not send DS Channel parameter for directed probe requests
1247          * in order to maximize the chance that we get a response.  Some
1248          * badly-behaved APs don't respond when this parameter is included.
1249          */
1250         if (directed)
1251                 chan_no = 0;
1252         else
1253                 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1254
1255         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1256                                      ssid, ssid_len, 100 + ie_len);
1257         if (!skb)
1258                 return NULL;
1259
1260         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1261                                            skb_tailroom(skb),
1262                                            ie, ie_len, chan->band,
1263                                            ratemask, chan_no);
1264         skb_put(skb, ies_len);
1265
1266         if (dst) {
1267                 mgmt = (struct ieee80211_mgmt *) skb->data;
1268                 memcpy(mgmt->da, dst, ETH_ALEN);
1269                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1270         }
1271
1272         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1273
1274         return skb;
1275 }
1276
1277 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1278                               const u8 *ssid, size_t ssid_len,
1279                               const u8 *ie, size_t ie_len,
1280                               u32 ratemask, bool directed, bool no_cck,
1281                               struct ieee80211_channel *channel, bool scan)
1282 {
1283         struct sk_buff *skb;
1284
1285         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1286                                         ssid, ssid_len,
1287                                         ie, ie_len, directed);
1288         if (skb) {
1289                 if (no_cck)
1290                         IEEE80211_SKB_CB(skb)->flags |=
1291                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1292                 if (scan)
1293                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1294                 else
1295                         ieee80211_tx_skb(sdata, skb);
1296         }
1297 }
1298
1299 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1300                             struct ieee802_11_elems *elems,
1301                             enum ieee80211_band band, u32 *basic_rates)
1302 {
1303         struct ieee80211_supported_band *sband;
1304         struct ieee80211_rate *bitrates;
1305         size_t num_rates;
1306         u32 supp_rates;
1307         int i, j;
1308         sband = local->hw.wiphy->bands[band];
1309
1310         if (WARN_ON(!sband))
1311                 return 1;
1312
1313         bitrates = sband->bitrates;
1314         num_rates = sband->n_bitrates;
1315         supp_rates = 0;
1316         for (i = 0; i < elems->supp_rates_len +
1317                      elems->ext_supp_rates_len; i++) {
1318                 u8 rate = 0;
1319                 int own_rate;
1320                 bool is_basic;
1321                 if (i < elems->supp_rates_len)
1322                         rate = elems->supp_rates[i];
1323                 else if (elems->ext_supp_rates)
1324                         rate = elems->ext_supp_rates
1325                                 [i - elems->supp_rates_len];
1326                 own_rate = 5 * (rate & 0x7f);
1327                 is_basic = !!(rate & 0x80);
1328
1329                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1330                         continue;
1331
1332                 for (j = 0; j < num_rates; j++) {
1333                         if (bitrates[j].bitrate == own_rate) {
1334                                 supp_rates |= BIT(j);
1335                                 if (basic_rates && is_basic)
1336                                         *basic_rates |= BIT(j);
1337                         }
1338                 }
1339         }
1340         return supp_rates;
1341 }
1342
1343 void ieee80211_stop_device(struct ieee80211_local *local)
1344 {
1345         ieee80211_led_radio(local, false);
1346         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1347
1348         cancel_work_sync(&local->reconfig_filter);
1349
1350         flush_workqueue(local->workqueue);
1351         drv_stop(local);
1352 }
1353
1354 int ieee80211_reconfig(struct ieee80211_local *local)
1355 {
1356         struct ieee80211_hw *hw = &local->hw;
1357         struct ieee80211_sub_if_data *sdata;
1358         struct ieee80211_chanctx *ctx;
1359         struct sta_info *sta;
1360         int res, i;
1361
1362 #ifdef CONFIG_PM
1363         if (local->suspended)
1364                 local->resuming = true;
1365
1366         if (local->wowlan) {
1367                 local->wowlan = false;
1368                 res = drv_resume(local);
1369                 if (res < 0) {
1370                         local->resuming = false;
1371                         return res;
1372                 }
1373                 if (res == 0)
1374                         goto wake_up;
1375                 WARN_ON(res > 1);
1376                 /*
1377                  * res is 1, which means the driver requested
1378                  * to go through a regular reset on wakeup.
1379                  */
1380         }
1381 #endif
1382         /* everything else happens only if HW was up & running */
1383         if (!local->open_count)
1384                 goto wake_up;
1385
1386         /*
1387          * Upon resume hardware can sometimes be goofy due to
1388          * various platform / driver / bus issues, so restarting
1389          * the device may at times not work immediately. Propagate
1390          * the error.
1391          */
1392         res = drv_start(local);
1393         if (res) {
1394                 WARN(local->suspended, "Hardware became unavailable "
1395                      "upon resume. This could be a software issue "
1396                      "prior to suspend or a hardware issue.\n");
1397                 return res;
1398         }
1399
1400         /* setup fragmentation threshold */
1401         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1402
1403         /* setup RTS threshold */
1404         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1405
1406         /* reset coverage class */
1407         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1408
1409         ieee80211_led_radio(local, true);
1410         ieee80211_mod_tpt_led_trig(local,
1411                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1412
1413         /* add interfaces */
1414         sdata = rtnl_dereference(local->monitor_sdata);
1415         if (sdata) {
1416                 res = drv_add_interface(local, sdata);
1417                 if (WARN_ON(res)) {
1418                         rcu_assign_pointer(local->monitor_sdata, NULL);
1419                         synchronize_net();
1420                         kfree(sdata);
1421                 }
1422         }
1423
1424         list_for_each_entry(sdata, &local->interfaces, list) {
1425                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1426                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1427                     ieee80211_sdata_running(sdata))
1428                         res = drv_add_interface(local, sdata);
1429         }
1430
1431         /* add channel contexts */
1432         if (local->use_chanctx) {
1433                 mutex_lock(&local->chanctx_mtx);
1434                 list_for_each_entry(ctx, &local->chanctx_list, list)
1435                         WARN_ON(drv_add_chanctx(local, ctx));
1436                 mutex_unlock(&local->chanctx_mtx);
1437         }
1438
1439         list_for_each_entry(sdata, &local->interfaces, list) {
1440                 struct ieee80211_chanctx_conf *ctx_conf;
1441
1442                 if (!ieee80211_sdata_running(sdata))
1443                         continue;
1444
1445                 mutex_lock(&local->chanctx_mtx);
1446                 ctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1447                                 lockdep_is_held(&local->chanctx_mtx));
1448                 if (ctx_conf) {
1449                         ctx = container_of(ctx_conf, struct ieee80211_chanctx,
1450                                            conf);
1451                         drv_assign_vif_chanctx(local, sdata, ctx);
1452                 }
1453                 mutex_unlock(&local->chanctx_mtx);
1454         }
1455
1456         sdata = rtnl_dereference(local->monitor_sdata);
1457         if (sdata && local->use_chanctx && ieee80211_sdata_running(sdata)) {
1458                 struct ieee80211_chanctx_conf *ctx_conf;
1459
1460                 mutex_lock(&local->chanctx_mtx);
1461                 ctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1462                                 lockdep_is_held(&local->chanctx_mtx));
1463                 if (ctx_conf) {
1464                         ctx = container_of(ctx_conf, struct ieee80211_chanctx,
1465                                            conf);
1466                         drv_assign_vif_chanctx(local, sdata, ctx);
1467                 }
1468                 mutex_unlock(&local->chanctx_mtx);
1469         }
1470
1471         /* add STAs back */
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                 /* AP-mode stations will be added later */
1480                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1481                         continue;
1482
1483                 for (state = IEEE80211_STA_NOTEXIST;
1484                      state < sta->sta_state; state++)
1485                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1486                                               state + 1));
1487         }
1488         mutex_unlock(&local->sta_mtx);
1489
1490         /* reconfigure tx conf */
1491         if (hw->queues >= IEEE80211_NUM_ACS) {
1492                 list_for_each_entry(sdata, &local->interfaces, list) {
1493                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1494                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1495                             !ieee80211_sdata_running(sdata))
1496                                 continue;
1497
1498                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1499                                 drv_conf_tx(local, sdata, i,
1500                                             &sdata->tx_conf[i]);
1501                 }
1502         }
1503
1504         /* reconfigure hardware */
1505         ieee80211_hw_config(local, ~0);
1506
1507         ieee80211_configure_filter(local);
1508
1509         /* Finally also reconfigure all the BSS information */
1510         list_for_each_entry(sdata, &local->interfaces, list) {
1511                 u32 changed;
1512
1513                 if (!ieee80211_sdata_running(sdata))
1514                         continue;
1515
1516                 /* common change flags for all interface types */
1517                 changed = BSS_CHANGED_ERP_CTS_PROT |
1518                           BSS_CHANGED_ERP_PREAMBLE |
1519                           BSS_CHANGED_ERP_SLOT |
1520                           BSS_CHANGED_HT |
1521                           BSS_CHANGED_BASIC_RATES |
1522                           BSS_CHANGED_BEACON_INT |
1523                           BSS_CHANGED_BSSID |
1524                           BSS_CHANGED_CQM |
1525                           BSS_CHANGED_QOS |
1526                           BSS_CHANGED_IDLE |
1527                           BSS_CHANGED_TXPOWER;
1528
1529                 switch (sdata->vif.type) {
1530                 case NL80211_IFTYPE_STATION:
1531                         changed |= BSS_CHANGED_ASSOC |
1532                                    BSS_CHANGED_ARP_FILTER |
1533                                    BSS_CHANGED_PS;
1534                         mutex_lock(&sdata->u.mgd.mtx);
1535                         ieee80211_bss_info_change_notify(sdata, changed);
1536                         mutex_unlock(&sdata->u.mgd.mtx);
1537                         break;
1538                 case NL80211_IFTYPE_ADHOC:
1539                         changed |= BSS_CHANGED_IBSS;
1540                         /* fall through */
1541                 case NL80211_IFTYPE_AP:
1542                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1543
1544                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1545                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1546
1547                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1548                                         drv_start_ap(local, sdata);
1549                         }
1550
1551                         /* fall through */
1552                 case NL80211_IFTYPE_MESH_POINT:
1553                         changed |= BSS_CHANGED_BEACON |
1554                                    BSS_CHANGED_BEACON_ENABLED;
1555                         ieee80211_bss_info_change_notify(sdata, changed);
1556                         break;
1557                 case NL80211_IFTYPE_WDS:
1558                         break;
1559                 case NL80211_IFTYPE_AP_VLAN:
1560                 case NL80211_IFTYPE_MONITOR:
1561                         /* ignore virtual */
1562                         break;
1563                 case NL80211_IFTYPE_P2P_DEVICE:
1564                         changed = BSS_CHANGED_IDLE;
1565                         break;
1566                 case NL80211_IFTYPE_UNSPECIFIED:
1567                 case NUM_NL80211_IFTYPES:
1568                 case NL80211_IFTYPE_P2P_CLIENT:
1569                 case NL80211_IFTYPE_P2P_GO:
1570                         WARN_ON(1);
1571                         break;
1572                 }
1573         }
1574
1575         ieee80211_recalc_ps(local, -1);
1576
1577         /*
1578          * The sta might be in psm against the ap (e.g. because
1579          * this was the state before a hw restart), so we
1580          * explicitly send a null packet in order to make sure
1581          * it'll sync against the ap (and get out of psm).
1582          */
1583         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1584                 list_for_each_entry(sdata, &local->interfaces, list) {
1585                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1586                                 continue;
1587                         if (!sdata->u.mgd.associated)
1588                                 continue;
1589
1590                         ieee80211_send_nullfunc(local, sdata, 0);
1591                 }
1592         }
1593
1594         /* APs are now beaconing, add back stations */
1595         mutex_lock(&local->sta_mtx);
1596         list_for_each_entry(sta, &local->sta_list, list) {
1597                 enum ieee80211_sta_state state;
1598
1599                 if (!sta->uploaded)
1600                         continue;
1601
1602                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1603                         continue;
1604
1605                 for (state = IEEE80211_STA_NOTEXIST;
1606                      state < sta->sta_state; state++)
1607                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1608                                               state + 1));
1609         }
1610         mutex_unlock(&local->sta_mtx);
1611
1612         /* add back keys */
1613         list_for_each_entry(sdata, &local->interfaces, list)
1614                 if (ieee80211_sdata_running(sdata))
1615                         ieee80211_enable_keys(sdata);
1616
1617  wake_up:
1618         local->in_reconfig = false;
1619         barrier();
1620
1621         /*
1622          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1623          * sessions can be established after a resume.
1624          *
1625          * Also tear down aggregation sessions since reconfiguring
1626          * them in a hardware restart scenario is not easily done
1627          * right now, and the hardware will have lost information
1628          * about the sessions, but we and the AP still think they
1629          * are active. This is really a workaround though.
1630          */
1631         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1632                 mutex_lock(&local->sta_mtx);
1633
1634                 list_for_each_entry(sta, &local->sta_list, list) {
1635                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1636                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1637                 }
1638
1639                 mutex_unlock(&local->sta_mtx);
1640         }
1641
1642         ieee80211_wake_queues_by_reason(hw,
1643                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1644
1645         /*
1646          * If this is for hw restart things are still running.
1647          * We may want to change that later, however.
1648          */
1649         if (!local->suspended) {
1650                 drv_restart_complete(local);
1651                 return 0;
1652         }
1653
1654 #ifdef CONFIG_PM
1655         /* first set suspended false, then resuming */
1656         local->suspended = false;
1657         mb();
1658         local->resuming = false;
1659
1660         list_for_each_entry(sdata, &local->interfaces, list) {
1661                 switch(sdata->vif.type) {
1662                 case NL80211_IFTYPE_STATION:
1663                         ieee80211_sta_restart(sdata);
1664                         break;
1665                 case NL80211_IFTYPE_ADHOC:
1666                         ieee80211_ibss_restart(sdata);
1667                         break;
1668                 case NL80211_IFTYPE_MESH_POINT:
1669                         ieee80211_mesh_restart(sdata);
1670                         break;
1671                 default:
1672                         break;
1673                 }
1674         }
1675
1676         mod_timer(&local->sta_cleanup, jiffies + 1);
1677
1678         mutex_lock(&local->sta_mtx);
1679         list_for_each_entry(sta, &local->sta_list, list)
1680                 mesh_plink_restart(sta);
1681         mutex_unlock(&local->sta_mtx);
1682 #else
1683         WARN_ON(1);
1684 #endif
1685         return 0;
1686 }
1687
1688 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1689 {
1690         struct ieee80211_sub_if_data *sdata;
1691         struct ieee80211_local *local;
1692         struct ieee80211_key *key;
1693
1694         if (WARN_ON(!vif))
1695                 return;
1696
1697         sdata = vif_to_sdata(vif);
1698         local = sdata->local;
1699
1700         if (WARN_ON(!local->resuming))
1701                 return;
1702
1703         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1704                 return;
1705
1706         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1707
1708         mutex_lock(&local->key_mtx);
1709         list_for_each_entry(key, &sdata->key_list, list)
1710                 key->flags |= KEY_FLAG_TAINTED;
1711         mutex_unlock(&local->key_mtx);
1712 }
1713 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1714
1715 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1716 {
1717         struct ieee80211_local *local = sdata->local;
1718         struct ieee80211_chanctx_conf *chanctx_conf;
1719         struct ieee80211_chanctx *chanctx;
1720
1721         mutex_lock(&local->chanctx_mtx);
1722
1723         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1724                                         lockdep_is_held(&local->chanctx_mtx));
1725
1726         if (WARN_ON_ONCE(!chanctx_conf))
1727                 goto unlock;
1728
1729         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1730         ieee80211_recalc_smps_chanctx(local, chanctx);
1731  unlock:
1732         mutex_unlock(&local->chanctx_mtx);
1733 }
1734
1735 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1736 {
1737         int i;
1738
1739         for (i = 0; i < n_ids; i++)
1740                 if (ids[i] == id)
1741                         return true;
1742         return false;
1743 }
1744
1745 /**
1746  * ieee80211_ie_split - split an IE buffer according to ordering
1747  *
1748  * @ies: the IE buffer
1749  * @ielen: the length of the IE buffer
1750  * @ids: an array with element IDs that are allowed before
1751  *      the split
1752  * @n_ids: the size of the element ID array
1753  * @offset: offset where to start splitting in the buffer
1754  *
1755  * This function splits an IE buffer by updating the @offset
1756  * variable to point to the location where the buffer should be
1757  * split.
1758  *
1759  * It assumes that the given IE buffer is well-formed, this
1760  * has to be guaranteed by the caller!
1761  *
1762  * It also assumes that the IEs in the buffer are ordered
1763  * correctly, if not the result of using this function will not
1764  * be ordered correctly either, i.e. it does no reordering.
1765  *
1766  * The function returns the offset where the next part of the
1767  * buffer starts, which may be @ielen if the entire (remainder)
1768  * of the buffer should be used.
1769  */
1770 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1771                           const u8 *ids, int n_ids, size_t offset)
1772 {
1773         size_t pos = offset;
1774
1775         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1776                 pos += 2 + ies[pos + 1];
1777
1778         return pos;
1779 }
1780
1781 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1782 {
1783         size_t pos = offset;
1784
1785         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1786                 pos += 2 + ies[pos + 1];
1787
1788         return pos;
1789 }
1790
1791 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1792                                             int rssi_min_thold,
1793                                             int rssi_max_thold)
1794 {
1795         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1796
1797         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1798                 return;
1799
1800         /*
1801          * Scale up threshold values before storing it, as the RSSI averaging
1802          * algorithm uses a scaled up value as well. Change this scaling
1803          * factor if the RSSI averaging algorithm changes.
1804          */
1805         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1806         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1807 }
1808
1809 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1810                                     int rssi_min_thold,
1811                                     int rssi_max_thold)
1812 {
1813         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1814
1815         WARN_ON(rssi_min_thold == rssi_max_thold ||
1816                 rssi_min_thold > rssi_max_thold);
1817
1818         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1819                                        rssi_max_thold);
1820 }
1821 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1822
1823 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1824 {
1825         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1826
1827         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1828 }
1829 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1830
1831 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1832                               u16 cap)
1833 {
1834         __le16 tmp;
1835
1836         *pos++ = WLAN_EID_HT_CAPABILITY;
1837         *pos++ = sizeof(struct ieee80211_ht_cap);
1838         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1839
1840         /* capability flags */
1841         tmp = cpu_to_le16(cap);
1842         memcpy(pos, &tmp, sizeof(u16));
1843         pos += sizeof(u16);
1844
1845         /* AMPDU parameters */
1846         *pos++ = ht_cap->ampdu_factor |
1847                  (ht_cap->ampdu_density <<
1848                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1849
1850         /* MCS set */
1851         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1852         pos += sizeof(ht_cap->mcs);
1853
1854         /* extended capabilities */
1855         pos += sizeof(__le16);
1856
1857         /* BF capabilities */
1858         pos += sizeof(__le32);
1859
1860         /* antenna selection */
1861         pos += sizeof(u8);
1862
1863         return pos;
1864 }
1865
1866 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1867                                                            u32 cap)
1868 {
1869         __le32 tmp;
1870
1871         *pos++ = WLAN_EID_VHT_CAPABILITY;
1872         *pos++ = sizeof(struct ieee80211_vht_cap);
1873         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1874
1875         /* capability flags */
1876         tmp = cpu_to_le32(cap);
1877         memcpy(pos, &tmp, sizeof(u32));
1878         pos += sizeof(u32);
1879
1880         /* VHT MCS set */
1881         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1882         pos += sizeof(vht_cap->vht_mcs);
1883
1884         return pos;
1885 }
1886
1887 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1888                                const struct cfg80211_chan_def *chandef,
1889                                u16 prot_mode)
1890 {
1891         struct ieee80211_ht_operation *ht_oper;
1892         /* Build HT Information */
1893         *pos++ = WLAN_EID_HT_OPERATION;
1894         *pos++ = sizeof(struct ieee80211_ht_operation);
1895         ht_oper = (struct ieee80211_ht_operation *)pos;
1896         ht_oper->primary_chan = ieee80211_frequency_to_channel(
1897                                         chandef->chan->center_freq);
1898         switch (chandef->width) {
1899         case NL80211_CHAN_WIDTH_160:
1900         case NL80211_CHAN_WIDTH_80P80:
1901         case NL80211_CHAN_WIDTH_80:
1902         case NL80211_CHAN_WIDTH_40:
1903                 if (chandef->center_freq1 > chandef->chan->center_freq)
1904                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1905                 else
1906                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1907                 break;
1908         default:
1909                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1910                 break;
1911         }
1912         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1913             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
1914             chandef->width != NL80211_CHAN_WIDTH_20)
1915                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1916
1917         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1918         ht_oper->stbc_param = 0x0000;
1919
1920         /* It seems that Basic MCS set and Supported MCS set
1921            are identical for the first 10 bytes */
1922         memset(&ht_oper->basic_set, 0, 16);
1923         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1924
1925         return pos + sizeof(struct ieee80211_ht_operation);
1926 }
1927
1928 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
1929                                   struct ieee80211_ht_operation *ht_oper,
1930                                   struct cfg80211_chan_def *chandef)
1931 {
1932         enum nl80211_channel_type channel_type;
1933
1934         if (!ht_oper) {
1935                 cfg80211_chandef_create(chandef, control_chan,
1936                                         NL80211_CHAN_NO_HT);
1937                 return;
1938         }
1939
1940         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1941         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1942                 channel_type = NL80211_CHAN_HT20;
1943                 break;
1944         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1945                 channel_type = NL80211_CHAN_HT40PLUS;
1946                 break;
1947         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1948                 channel_type = NL80211_CHAN_HT40MINUS;
1949                 break;
1950         default:
1951                 channel_type = NL80211_CHAN_NO_HT;
1952         }
1953
1954         cfg80211_chandef_create(chandef, control_chan, channel_type);
1955 }
1956
1957 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1958                             struct sk_buff *skb, bool need_basic,
1959                             enum ieee80211_band band)
1960 {
1961         struct ieee80211_local *local = sdata->local;
1962         struct ieee80211_supported_band *sband;
1963         int rate;
1964         u8 i, rates, *pos;
1965         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1966
1967         sband = local->hw.wiphy->bands[band];
1968         rates = sband->n_bitrates;
1969         if (rates > 8)
1970                 rates = 8;
1971
1972         if (skb_tailroom(skb) < rates + 2)
1973                 return -ENOMEM;
1974
1975         pos = skb_put(skb, rates + 2);
1976         *pos++ = WLAN_EID_SUPP_RATES;
1977         *pos++ = rates;
1978         for (i = 0; i < rates; i++) {
1979                 u8 basic = 0;
1980                 if (need_basic && basic_rates & BIT(i))
1981                         basic = 0x80;
1982                 rate = sband->bitrates[i].bitrate;
1983                 *pos++ = basic | (u8) (rate / 5);
1984         }
1985
1986         return 0;
1987 }
1988
1989 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1990                                 struct sk_buff *skb, bool need_basic,
1991                                 enum ieee80211_band band)
1992 {
1993         struct ieee80211_local *local = sdata->local;
1994         struct ieee80211_supported_band *sband;
1995         int rate;
1996         u8 i, exrates, *pos;
1997         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1998
1999         sband = local->hw.wiphy->bands[band];
2000         exrates = sband->n_bitrates;
2001         if (exrates > 8)
2002                 exrates -= 8;
2003         else
2004                 exrates = 0;
2005
2006         if (skb_tailroom(skb) < exrates + 2)
2007                 return -ENOMEM;
2008
2009         if (exrates) {
2010                 pos = skb_put(skb, exrates + 2);
2011                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2012                 *pos++ = exrates;
2013                 for (i = 8; i < sband->n_bitrates; i++) {
2014                         u8 basic = 0;
2015                         if (need_basic && basic_rates & BIT(i))
2016                                 basic = 0x80;
2017                         rate = sband->bitrates[i].bitrate;
2018                         *pos++ = basic | (u8) (rate / 5);
2019                 }
2020         }
2021         return 0;
2022 }
2023
2024 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2025 {
2026         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2027         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2028
2029         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2030                 /* non-managed type inferfaces */
2031                 return 0;
2032         }
2033         return ifmgd->ave_beacon_signal;
2034 }
2035 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2036
2037 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2038 {
2039         if (!mcs)
2040                 return 1;
2041
2042         /* TODO: consider rx_highest */
2043
2044         if (mcs->rx_mask[3])
2045                 return 4;
2046         if (mcs->rx_mask[2])
2047                 return 3;
2048         if (mcs->rx_mask[1])
2049                 return 2;
2050         return 1;
2051 }
2052
2053 /**
2054  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2055  * @local: mac80211 hw info struct
2056  * @status: RX status
2057  * @mpdu_len: total MPDU length (including FCS)
2058  * @mpdu_offset: offset into MPDU to calculate timestamp at
2059  *
2060  * This function calculates the RX timestamp at the given MPDU offset, taking
2061  * into account what the RX timestamp was. An offset of 0 will just normalize
2062  * the timestamp to TSF at beginning of MPDU reception.
2063  */
2064 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2065                                      struct ieee80211_rx_status *status,
2066                                      unsigned int mpdu_len,
2067                                      unsigned int mpdu_offset)
2068 {
2069         u64 ts = status->mactime;
2070         struct rate_info ri;
2071         u16 rate;
2072
2073         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2074                 return 0;
2075
2076         memset(&ri, 0, sizeof(ri));
2077
2078         /* Fill cfg80211 rate info */
2079         if (status->flag & RX_FLAG_HT) {
2080                 ri.mcs = status->rate_idx;
2081                 ri.flags |= RATE_INFO_FLAGS_MCS;
2082                 if (status->flag & RX_FLAG_40MHZ)
2083                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2084                 if (status->flag & RX_FLAG_SHORT_GI)
2085                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2086         } else if (status->flag & RX_FLAG_VHT) {
2087                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2088                 ri.mcs = status->rate_idx;
2089                 ri.nss = status->vht_nss;
2090                 if (status->flag & RX_FLAG_40MHZ)
2091                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2092                 if (status->flag & RX_FLAG_80MHZ)
2093                         ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2094                 if (status->flag & RX_FLAG_80P80MHZ)
2095                         ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2096                 if (status->flag & RX_FLAG_160MHZ)
2097                         ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2098                 if (status->flag & RX_FLAG_SHORT_GI)
2099                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2100         } else {
2101                 struct ieee80211_supported_band *sband;
2102
2103                 sband = local->hw.wiphy->bands[status->band];
2104                 ri.legacy = sband->bitrates[status->rate_idx].bitrate;
2105         }
2106
2107         rate = cfg80211_calculate_bitrate(&ri);
2108
2109         /* rewind from end of MPDU */
2110         if (status->flag & RX_FLAG_MACTIME_END)
2111                 ts -= mpdu_len * 8 * 10 / rate;
2112
2113         ts += mpdu_offset * 8 * 10 / rate;
2114
2115         return ts;
2116 }