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                                      unsigned long queues,
 457                                      enum queue_stop_reason reason)
 458 {
 459         struct ieee80211_local *local = hw_to_local(hw);
 460         unsigned long flags;
 461         int i;
 462
 463         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 464
 465         for_each_set_bit(i, &queues, hw->queues)
 466                 __ieee80211_stop_queue(hw, i, reason);
 467
 468         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 469 }
 470
 471 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 472 {
 473         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 474                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 475 }
 476 EXPORT_SYMBOL(ieee80211_stop_queues);
 477
 478 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 479 {
 480         struct ieee80211_local *local = hw_to_local(hw);
 481         unsigned long flags;
 482         int ret;
 483
 484         if (WARN_ON(queue >= hw->queues))
 485                 return true;
 486
 487         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 488         ret = !!local->queue_stop_reasons[queue];
 489         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 490         return ret;
 491 }
 492 EXPORT_SYMBOL(ieee80211_queue_stopped);
 493
 494 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 495                                      unsigned long queues,
 496                                      enum queue_stop_reason reason)
 497 {
 498         struct ieee80211_local *local = hw_to_local(hw);
 499         unsigned long flags;
 500         int i;
 501
 502         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 503
 504         for_each_set_bit(i, &queues, hw->queues)
 505                 __ieee80211_wake_queue(hw, i, reason);
 506
 507         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 508 }
 509
 510 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 511 {
 512         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 513                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 514 }
 515 EXPORT_SYMBOL(ieee80211_wake_queues);
 516
 517 void ieee80211_flush_queues(struct ieee80211_local *local,
 518                             struct ieee80211_sub_if_data *sdata)
 519 {
 520         u32 queues;
 521
 522         if (!local->ops->flush)
 523                 return;
 524
 525         if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
 526                 int ac;
 527
 528                 queues = 0;
 529
 530                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 531                         queues |= BIT(sdata->vif.hw_queue[ac]);
 532                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 533                         queues |= BIT(sdata->vif.cab_queue);
 534         } else {
 535                 /* all queues */
 536                 queues = BIT(local->hw.queues) - 1;
 537         }
 538
 539         ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 540                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 541
 542         drv_flush(local, queues, false);
 543
 544         ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 545                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 546 }
 547
 548 void ieee80211_iterate_active_interfaces(
 549         struct ieee80211_hw *hw, u32 iter_flags,
 550         void (*iterator)(void *data, u8 *mac,
 551                          struct ieee80211_vif *vif),
 552         void *data)
 553 {
 554         struct ieee80211_local *local = hw_to_local(hw);
 555         struct ieee80211_sub_if_data *sdata;
 556
 557         mutex_lock(&local->iflist_mtx);
 558
 559         list_for_each_entry(sdata, &local->interfaces, list) {
 560                 switch (sdata->vif.type) {
 561                 case NL80211_IFTYPE_MONITOR:
 562                 case NL80211_IFTYPE_AP_VLAN:
 563                         continue;
 564                 default:
 565                         break;
 566                 }
 567                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 568                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 569                         continue;
 570                 if (ieee80211_sdata_running(sdata))
 571                         iterator(data, sdata->vif.addr,
 572                                  &sdata->vif);
 573         }
 574
 575         sdata = rcu_dereference_protected(local->monitor_sdata,
 576                                           lockdep_is_held(&local->iflist_mtx));
 577         if (sdata &&
 578             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 579              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 580                 iterator(data, sdata->vif.addr, &sdata->vif);
 581
 582         mutex_unlock(&local->iflist_mtx);
 583 }
 584 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 585
 586 void ieee80211_iterate_active_interfaces_atomic(
 587         struct ieee80211_hw *hw, u32 iter_flags,
 588         void (*iterator)(void *data, u8 *mac,
 589                          struct ieee80211_vif *vif),
 590         void *data)
 591 {
 592         struct ieee80211_local *local = hw_to_local(hw);
 593         struct ieee80211_sub_if_data *sdata;
 594
 595         rcu_read_lock();
 596
 597         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 598                 switch (sdata->vif.type) {
 599                 case NL80211_IFTYPE_MONITOR:
 600                 case NL80211_IFTYPE_AP_VLAN:
 601                         continue;
 602                 default:
 603                         break;
 604                 }
 605                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 606                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 607                         continue;
 608                 if (ieee80211_sdata_running(sdata))
 609                         iterator(data, sdata->vif.addr,
 610                                  &sdata->vif);
 611         }
 612
 613         sdata = rcu_dereference(local->monitor_sdata);
 614         if (sdata &&
 615             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 616              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 617                 iterator(data, sdata->vif.addr, &sdata->vif);
 618
 619         rcu_read_unlock();
 620 }
 621 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 622
 623 /*
 624  * Nothing should have been stuffed into the workqueue during
 625  * the suspend->resume cycle. If this WARN is seen then there
 626  * is a bug with either the driver suspend or something in
 627  * mac80211 stuffing into the workqueue which we haven't yet
 628  * cleared during mac80211's suspend cycle.
 629  */
 630 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 631 {
 632         if (WARN(local->suspended && !local->resuming,
 633                  "queueing ieee80211 work while going to suspend\n"))
 634                 return false;
 635
 636         return true;
 637 }
 638
 639 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 640 {
 641         struct ieee80211_local *local = hw_to_local(hw);
 642
 643         if (!ieee80211_can_queue_work(local))
 644                 return;
 645
 646         queue_work(local->workqueue, work);
 647 }
 648 EXPORT_SYMBOL(ieee80211_queue_work);
 649
 650 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 651                                   struct delayed_work *dwork,
 652                                   unsigned long delay)
 653 {
 654         struct ieee80211_local *local = hw_to_local(hw);
 655
 656         if (!ieee80211_can_queue_work(local))
 657                 return;
 658
 659         queue_delayed_work(local->workqueue, dwork, delay);
 660 }
 661 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 662
 663 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 664                                struct ieee802_11_elems *elems,
 665                                u64 filter, u32 crc)
 666 {
 667         size_t left = len;
 668         u8 *pos = start;
 669         bool calc_crc = filter != 0;
 670         DECLARE_BITMAP(seen_elems, 256);
 671
 672         bitmap_zero(seen_elems, 256);
 673         memset(elems, 0, sizeof(*elems));
 674         elems->ie_start = start;
 675         elems->total_len = len;
 676
 677         while (left >= 2) {
 678                 u8 id, elen;
 679                 bool elem_parse_failed;
 680
 681                 id = *pos++;
 682                 elen = *pos++;
 683                 left -= 2;
 684
 685                 if (elen > left) {
 686                         elems->parse_error = true;
 687                         break;
 688                 }
 689
 690                 switch (id) {
 691                 case WLAN_EID_SSID:
 692                 case WLAN_EID_SUPP_RATES:
 693                 case WLAN_EID_FH_PARAMS:
 694                 case WLAN_EID_DS_PARAMS:
 695                 case WLAN_EID_CF_PARAMS:
 696                 case WLAN_EID_TIM:
 697                 case WLAN_EID_IBSS_PARAMS:
 698                 case WLAN_EID_CHALLENGE:
 699                 case WLAN_EID_RSN:
 700                 case WLAN_EID_ERP_INFO:
 701                 case WLAN_EID_EXT_SUPP_RATES:
 702                 case WLAN_EID_HT_CAPABILITY:
 703                 case WLAN_EID_HT_OPERATION:
 704                 case WLAN_EID_VHT_CAPABILITY:
 705                 case WLAN_EID_VHT_OPERATION:
 706                 case WLAN_EID_MESH_ID:
 707                 case WLAN_EID_MESH_CONFIG:
 708                 case WLAN_EID_PEER_MGMT:
 709                 case WLAN_EID_PREQ:
 710                 case WLAN_EID_PREP:
 711                 case WLAN_EID_PERR:
 712                 case WLAN_EID_RANN:
 713                 case WLAN_EID_CHANNEL_SWITCH:
 714                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 715                 case WLAN_EID_COUNTRY:
 716                 case WLAN_EID_PWR_CONSTRAINT:
 717                 case WLAN_EID_TIMEOUT_INTERVAL:
 718                         if (test_bit(id, seen_elems)) {
 719                                 elems->parse_error = true;
 720                                 left -= elen;
 721                                 pos += elen;
 722                                 continue;
 723                         }
 724                         break;
 725                 }
 726
 727                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 728                         crc = crc32_be(crc, pos - 2, elen + 2);
 729
 730                 elem_parse_failed = false;
 731
 732                 switch (id) {
 733                 case WLAN_EID_SSID:
 734                         elems->ssid = pos;
 735                         elems->ssid_len = elen;
 736                         break;
 737                 case WLAN_EID_SUPP_RATES:
 738                         elems->supp_rates = pos;
 739                         elems->supp_rates_len = elen;
 740                         break;
 741                 case WLAN_EID_DS_PARAMS:
 742                         if (elen >= 1)
 743                                 elems->ds_params = pos;
 744                         else
 745                                 elem_parse_failed = true;
 746                         break;
 747                 case WLAN_EID_TIM:
 748                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 749                                 elems->tim = (void *)pos;
 750                                 elems->tim_len = elen;
 751                         } else
 752                                 elem_parse_failed = true;
 753                         break;
 754                 case WLAN_EID_CHALLENGE:
 755                         elems->challenge = pos;
 756                         elems->challenge_len = elen;
 757                         break;
 758                 case WLAN_EID_VENDOR_SPECIFIC:
 759                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 760                             pos[2] == 0xf2) {
 761                                 /* Microsoft OUI (00:50:F2) */
 762
 763                                 if (calc_crc)
 764                                         crc = crc32_be(crc, pos - 2, elen + 2);
 765
 766                                 if (elen >= 5 && pos[3] == 2) {
 767                                         /* OUI Type 2 - WMM IE */
 768                                         if (pos[4] == 0) {
 769                                                 elems->wmm_info = pos;
 770                                                 elems->wmm_info_len = elen;
 771                                         } else if (pos[4] == 1) {
 772                                                 elems->wmm_param = pos;
 773                                                 elems->wmm_param_len = elen;
 774                                         }
 775                                 }
 776                         }
 777                         break;
 778                 case WLAN_EID_RSN:
 779                         elems->rsn = pos;
 780                         elems->rsn_len = elen;
 781                         break;
 782                 case WLAN_EID_ERP_INFO:
 783                         if (elen >= 1)
 784                                 elems->erp_info = pos;
 785                         else
 786                                 elem_parse_failed = true;
 787                         break;
 788                 case WLAN_EID_EXT_SUPP_RATES:
 789                         elems->ext_supp_rates = pos;
 790                         elems->ext_supp_rates_len = elen;
 791                         break;
 792                 case WLAN_EID_HT_CAPABILITY:
 793                         if (elen >= sizeof(struct ieee80211_ht_cap))
 794                                 elems->ht_cap_elem = (void *)pos;
 795                         else
 796                                 elem_parse_failed = true;
 797                         break;
 798                 case WLAN_EID_HT_OPERATION:
 799                         if (elen >= sizeof(struct ieee80211_ht_operation))
 800                                 elems->ht_operation = (void *)pos;
 801                         else
 802                                 elem_parse_failed = true;
 803                         break;
 804                 case WLAN_EID_VHT_CAPABILITY:
 805                         if (elen >= sizeof(struct ieee80211_vht_cap))
 806                                 elems->vht_cap_elem = (void *)pos;
 807                         else
 808                                 elem_parse_failed = true;
 809                         break;
 810                 case WLAN_EID_VHT_OPERATION:
 811                         if (elen >= sizeof(struct ieee80211_vht_operation))
 812                                 elems->vht_operation = (void *)pos;
 813                         else
 814                                 elem_parse_failed = true;
 815                         break;
 816                 case WLAN_EID_OPMODE_NOTIF:
 817                         if (elen > 0)
 818                                 elems->opmode_notif = pos;
 819                         else
 820                                 elem_parse_failed = true;
 821                         break;
 822                 case WLAN_EID_MESH_ID:
 823                         elems->mesh_id = pos;
 824                         elems->mesh_id_len = elen;
 825                         break;
 826                 case WLAN_EID_MESH_CONFIG:
 827                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 828                                 elems->mesh_config = (void *)pos;
 829                         else
 830                                 elem_parse_failed = true;
 831                         break;
 832                 case WLAN_EID_PEER_MGMT:
 833                         elems->peering = pos;
 834                         elems->peering_len = elen;
 835                         break;
 836                 case WLAN_EID_MESH_AWAKE_WINDOW:
 837                         if (elen >= 2)
 838                                 elems->awake_window = (void *)pos;
 839                         break;
 840                 case WLAN_EID_PREQ:
 841                         elems->preq = pos;
 842                         elems->preq_len = elen;
 843                         break;
 844                 case WLAN_EID_PREP:
 845                         elems->prep = pos;
 846                         elems->prep_len = elen;
 847                         break;
 848                 case WLAN_EID_PERR:
 849                         elems->perr = pos;
 850                         elems->perr_len = elen;
 851                         break;
 852                 case WLAN_EID_RANN:
 853                         if (elen >= sizeof(struct ieee80211_rann_ie))
 854                                 elems->rann = (void *)pos;
 855                         else
 856                                 elem_parse_failed = true;
 857                         break;
 858                 case WLAN_EID_CHANNEL_SWITCH:
 859                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 860                                 elem_parse_failed = true;
 861                                 break;
 862                         }
 863                         elems->ch_switch_ie = (void *)pos;
 864                         break;
 865                 case WLAN_EID_COUNTRY:
 866                         elems->country_elem = pos;
 867                         elems->country_elem_len = elen;
 868                         break;
 869                 case WLAN_EID_PWR_CONSTRAINT:
 870                         if (elen != 1) {
 871                                 elem_parse_failed = true;
 872                                 break;
 873                         }
 874                         elems->pwr_constr_elem = pos;
 875                         break;
 876                 case WLAN_EID_TIMEOUT_INTERVAL:
 877                         elems->timeout_int = pos;
 878                         elems->timeout_int_len = elen;
 879                         break;
 880                 default:
 881                         break;
 882                 }
 883
 884                 if (elem_parse_failed)
 885                         elems->parse_error = true;
 886                 else
 887                         __set_bit(id, seen_elems);
 888
 889                 left -= elen;
 890                 pos += elen;
 891         }
 892
 893         if (left != 0)
 894                 elems->parse_error = true;
 895
 896         return crc;
 897 }
 898
 899 void ieee802_11_parse_elems(u8 *start, size_t len,
 900                             struct ieee802_11_elems *elems)
 901 {
 902         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 903 }
 904
 905 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 906                                bool bss_notify)
 907 {
 908         struct ieee80211_local *local = sdata->local;
 909         struct ieee80211_tx_queue_params qparam;
 910         struct ieee80211_chanctx_conf *chanctx_conf;
 911         int ac;
 912         bool use_11b, enable_qos;
 913         int aCWmin, aCWmax;
 914
 915         if (!local->ops->conf_tx)
 916                 return;
 917
 918         if (local->hw.queues < IEEE80211_NUM_ACS)
 919                 return;
 920
 921         memset(&qparam, 0, sizeof(qparam));
 922
 923         rcu_read_lock();
 924         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 925         use_11b = (chanctx_conf &&
 926                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
 927                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 928         rcu_read_unlock();
 929
 930         /*
 931          * By default disable QoS in STA mode for old access points, which do
 932          * not support 802.11e. New APs will provide proper queue parameters,
 933          * that we will configure later.
 934          */
 935         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 936
 937         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 938                 /* Set defaults according to 802.11-2007 Table 7-37 */
 939                 aCWmax = 1023;
 940                 if (use_11b)
 941                         aCWmin = 31;
 942                 else
 943                         aCWmin = 15;
 944
 945                 if (enable_qos) {
 946                         switch (ac) {
 947                         case IEEE80211_AC_BK:
 948                                 qparam.cw_max = aCWmax;
 949                                 qparam.cw_min = aCWmin;
 950                                 qparam.txop = 0;
 951                                 qparam.aifs = 7;
 952                                 break;
 953                         /* never happens but let's not leave undefined */
 954                         default:
 955                         case IEEE80211_AC_BE:
 956                                 qparam.cw_max = aCWmax;
 957                                 qparam.cw_min = aCWmin;
 958                                 qparam.txop = 0;
 959                                 qparam.aifs = 3;
 960                                 break;
 961                         case IEEE80211_AC_VI:
 962                                 qparam.cw_max = aCWmin;
 963                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 964                                 if (use_11b)
 965                                         qparam.txop = 6016/32;
 966                                 else
 967                                         qparam.txop = 3008/32;
 968                                 qparam.aifs = 2;
 969                                 break;
 970                         case IEEE80211_AC_VO:
 971                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 972                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 973                                 if (use_11b)
 974                                         qparam.txop = 3264/32;
 975                                 else
 976                                         qparam.txop = 1504/32;
 977                                 qparam.aifs = 2;
 978                                 break;
 979                         }
 980                 } else {
 981                         /* Confiure old 802.11b/g medium access rules. */
 982                         qparam.cw_max = aCWmax;
 983                         qparam.cw_min = aCWmin;
 984                         qparam.txop = 0;
 985                         qparam.aifs = 2;
 986                 }
 987
 988                 qparam.uapsd = false;
 989
 990                 sdata->tx_conf[ac] = qparam;
 991                 drv_conf_tx(local, sdata, ac, &qparam);
 992         }
 993
 994         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 995             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 996                 sdata->vif.bss_conf.qos = enable_qos;
 997                 if (bss_notify)
 998                         ieee80211_bss_info_change_notify(sdata,
 999                                                          BSS_CHANGED_QOS);
1000         }
1001 }
1002
1003 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
1004                                   const size_t supp_rates_len,
1005                                   const u8 *supp_rates)
1006 {
1007         struct ieee80211_chanctx_conf *chanctx_conf;
1008         int i, have_higher_than_11mbit = 0;
1009
1010         /* cf. IEEE 802.11 9.2.12 */
1011         for (i = 0; i < supp_rates_len; i++)
1012                 if ((supp_rates[i] & 0x7f) * 5 > 110)
1013                         have_higher_than_11mbit = 1;
1014
1015         rcu_read_lock();
1016         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1017
1018         if (chanctx_conf &&
1019             chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ &&
1020             have_higher_than_11mbit)
1021                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1022         else
1023                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1024         rcu_read_unlock();
1025
1026         ieee80211_set_wmm_default(sdata, true);
1027 }
1028
1029 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
1030                               enum ieee80211_band band)
1031 {
1032         struct ieee80211_supported_band *sband;
1033         struct ieee80211_rate *bitrates;
1034         u32 mandatory_rates;
1035         enum ieee80211_rate_flags mandatory_flag;
1036         int i;
1037
1038         sband = local->hw.wiphy->bands[band];
1039         if (WARN_ON(!sband))
1040                 return 1;
1041
1042         if (band == IEEE80211_BAND_2GHZ)
1043                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
1044         else
1045                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
1046
1047         bitrates = sband->bitrates;
1048         mandatory_rates = 0;
1049         for (i = 0; i < sband->n_bitrates; i++)
1050                 if (bitrates[i].flags & mandatory_flag)
1051                         mandatory_rates |= BIT(i);
1052         return mandatory_rates;
1053 }
1054
1055 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1056                          u16 transaction, u16 auth_alg, u16 status,
1057                          const u8 *extra, size_t extra_len, const u8 *da,
1058                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1059                          u32 tx_flags)
1060 {
1061         struct ieee80211_local *local = sdata->local;
1062         struct sk_buff *skb;
1063         struct ieee80211_mgmt *mgmt;
1064         int err;
1065
1066         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1067                             sizeof(*mgmt) + 6 + extra_len);
1068         if (!skb)
1069                 return;
1070
1071         skb_reserve(skb, local->hw.extra_tx_headroom);
1072
1073         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1074         memset(mgmt, 0, 24 + 6);
1075         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1076                                           IEEE80211_STYPE_AUTH);
1077         memcpy(mgmt->da, da, ETH_ALEN);
1078         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1079         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1080         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1081         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1082         mgmt->u.auth.status_code = cpu_to_le16(status);
1083         if (extra)
1084                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1085
1086         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1087                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1088                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1089                 WARN_ON(err);
1090         }
1091
1092         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1093                                         tx_flags;
1094         ieee80211_tx_skb(sdata, skb);
1095 }
1096
1097 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1098                                     const u8 *bssid, u16 stype, u16 reason,
1099                                     bool send_frame, u8 *frame_buf)
1100 {
1101         struct ieee80211_local *local = sdata->local;
1102         struct sk_buff *skb;
1103         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1104
1105         /* build frame */
1106         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1107         mgmt->duration = 0; /* initialize only */
1108         mgmt->seq_ctrl = 0; /* initialize only */
1109         memcpy(mgmt->da, bssid, ETH_ALEN);
1110         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1111         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1112         /* u.deauth.reason_code == u.disassoc.reason_code */
1113         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1114
1115         if (send_frame) {
1116                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1117                                     IEEE80211_DEAUTH_FRAME_LEN);
1118                 if (!skb)
1119                         return;
1120
1121                 skb_reserve(skb, local->hw.extra_tx_headroom);
1122
1123                 /* copy in frame */
1124                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1125                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1126
1127                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1128                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1129                         IEEE80211_SKB_CB(skb)->flags |=
1130                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1131
1132                 ieee80211_tx_skb(sdata, skb);
1133         }
1134 }
1135
1136 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1137                              size_t buffer_len, const u8 *ie, size_t ie_len,
1138                              enum ieee80211_band band, u32 rate_mask,
1139                              u8 channel)
1140 {
1141         struct ieee80211_supported_band *sband;
1142         u8 *pos = buffer, *end = buffer + buffer_len;
1143         size_t offset = 0, noffset;
1144         int supp_rates_len, i;
1145         u8 rates[32];
1146         int num_rates;
1147         int ext_rates_len;
1148
1149         sband = local->hw.wiphy->bands[band];
1150         if (WARN_ON_ONCE(!sband))
1151                 return 0;
1152
1153         num_rates = 0;
1154         for (i = 0; i < sband->n_bitrates; i++) {
1155                 if ((BIT(i) & rate_mask) == 0)
1156                         continue; /* skip rate */
1157                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1158         }
1159
1160         supp_rates_len = min_t(int, num_rates, 8);
1161
1162         if (end - pos < 2 + supp_rates_len)
1163                 goto out_err;
1164         *pos++ = WLAN_EID_SUPP_RATES;
1165         *pos++ = supp_rates_len;
1166         memcpy(pos, rates, supp_rates_len);
1167         pos += supp_rates_len;
1168
1169         /* insert "request information" if in custom IEs */
1170         if (ie && ie_len) {
1171                 static const u8 before_extrates[] = {
1172                         WLAN_EID_SSID,
1173                         WLAN_EID_SUPP_RATES,
1174                         WLAN_EID_REQUEST,
1175                 };
1176                 noffset = ieee80211_ie_split(ie, ie_len,
1177                                              before_extrates,
1178                                              ARRAY_SIZE(before_extrates),
1179                                              offset);
1180                 if (end - pos < noffset - offset)
1181                         goto out_err;
1182                 memcpy(pos, ie + offset, noffset - offset);
1183                 pos += noffset - offset;
1184                 offset = noffset;
1185         }
1186
1187         ext_rates_len = num_rates - supp_rates_len;
1188         if (ext_rates_len > 0) {
1189                 if (end - pos < 2 + ext_rates_len)
1190                         goto out_err;
1191                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1192                 *pos++ = ext_rates_len;
1193                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1194                 pos += ext_rates_len;
1195         }
1196
1197         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1198                 if (end - pos < 3)
1199                         goto out_err;
1200                 *pos++ = WLAN_EID_DS_PARAMS;
1201                 *pos++ = 1;
1202                 *pos++ = channel;
1203         }
1204
1205         /* insert custom IEs that go before HT */
1206         if (ie && ie_len) {
1207                 static const u8 before_ht[] = {
1208                         WLAN_EID_SSID,
1209                         WLAN_EID_SUPP_RATES,
1210                         WLAN_EID_REQUEST,
1211                         WLAN_EID_EXT_SUPP_RATES,
1212                         WLAN_EID_DS_PARAMS,
1213                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1214                 };
1215                 noffset = ieee80211_ie_split(ie, ie_len,
1216                                              before_ht, ARRAY_SIZE(before_ht),
1217                                              offset);
1218                 if (end - pos < noffset - offset)
1219                         goto out_err;
1220                 memcpy(pos, ie + offset, noffset - offset);
1221                 pos += noffset - offset;
1222                 offset = noffset;
1223         }
1224
1225         if (sband->ht_cap.ht_supported) {
1226                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1227                         goto out_err;
1228                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1229                                                 sband->ht_cap.cap);
1230         }
1231
1232         /*
1233          * If adding more here, adjust code in main.c
1234          * that calculates local->scan_ies_len.
1235          */
1236
1237         /* add any remaining custom IEs */
1238         if (ie && ie_len) {
1239                 noffset = ie_len;
1240                 if (end - pos < noffset - offset)
1241                         goto out_err;
1242                 memcpy(pos, ie + offset, noffset - offset);
1243                 pos += noffset - offset;
1244         }
1245
1246         if (sband->vht_cap.vht_supported) {
1247                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1248                         goto out_err;
1249                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1250                                                  sband->vht_cap.cap);
1251         }
1252
1253         return pos - buffer;
1254  out_err:
1255         WARN_ONCE(1, "not enough space for preq IEs\n");
1256         return pos - buffer;
1257 }
1258
1259 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1260                                           u8 *dst, u32 ratemask,
1261                                           struct ieee80211_channel *chan,
1262                                           const u8 *ssid, size_t ssid_len,
1263                                           const u8 *ie, size_t ie_len,
1264                                           bool directed)
1265 {
1266         struct ieee80211_local *local = sdata->local;
1267         struct sk_buff *skb;
1268         struct ieee80211_mgmt *mgmt;
1269         u8 chan_no;
1270         int ies_len;
1271
1272         /*
1273          * Do not send DS Channel parameter for directed probe requests
1274          * in order to maximize the chance that we get a response.  Some
1275          * badly-behaved APs don't respond when this parameter is included.
1276          */
1277         if (directed)
1278                 chan_no = 0;
1279         else
1280                 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1281
1282         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1283                                      ssid, ssid_len, 100 + ie_len);
1284         if (!skb)
1285                 return NULL;
1286
1287         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1288                                            skb_tailroom(skb),
1289                                            ie, ie_len, chan->band,
1290                                            ratemask, chan_no);
1291         skb_put(skb, ies_len);
1292
1293         if (dst) {
1294                 mgmt = (struct ieee80211_mgmt *) skb->data;
1295                 memcpy(mgmt->da, dst, ETH_ALEN);
1296                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1297         }
1298
1299         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1300
1301         return skb;
1302 }
1303
1304 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1305                               const u8 *ssid, size_t ssid_len,
1306                               const u8 *ie, size_t ie_len,
1307                               u32 ratemask, bool directed, u32 tx_flags,
1308                               struct ieee80211_channel *channel, bool scan)
1309 {
1310         struct sk_buff *skb;
1311
1312         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1313                                         ssid, ssid_len,
1314                                         ie, ie_len, directed);
1315         if (skb) {
1316                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1317                 if (scan)
1318                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1319                 else
1320                         ieee80211_tx_skb(sdata, skb);
1321         }
1322 }
1323
1324 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1325                             struct ieee802_11_elems *elems,
1326                             enum ieee80211_band band, u32 *basic_rates)
1327 {
1328         struct ieee80211_supported_band *sband;
1329         struct ieee80211_rate *bitrates;
1330         size_t num_rates;
1331         u32 supp_rates;
1332         int i, j;
1333         sband = local->hw.wiphy->bands[band];
1334
1335         if (WARN_ON(!sband))
1336                 return 1;
1337
1338         bitrates = sband->bitrates;
1339         num_rates = sband->n_bitrates;
1340         supp_rates = 0;
1341         for (i = 0; i < elems->supp_rates_len +
1342                      elems->ext_supp_rates_len; i++) {
1343                 u8 rate = 0;
1344                 int own_rate;
1345                 bool is_basic;
1346                 if (i < elems->supp_rates_len)
1347                         rate = elems->supp_rates[i];
1348                 else if (elems->ext_supp_rates)
1349                         rate = elems->ext_supp_rates
1350                                 [i - elems->supp_rates_len];
1351                 own_rate = 5 * (rate & 0x7f);
1352                 is_basic = !!(rate & 0x80);
1353
1354                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1355                         continue;
1356
1357                 for (j = 0; j < num_rates; j++) {
1358                         if (bitrates[j].bitrate == own_rate) {
1359                                 supp_rates |= BIT(j);
1360                                 if (basic_rates && is_basic)
1361                                         *basic_rates |= BIT(j);
1362                         }
1363                 }
1364         }
1365         return supp_rates;
1366 }
1367
1368 void ieee80211_stop_device(struct ieee80211_local *local)
1369 {
1370         ieee80211_led_radio(local, false);
1371         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1372
1373         cancel_work_sync(&local->reconfig_filter);
1374
1375         flush_workqueue(local->workqueue);
1376         drv_stop(local);
1377 }
1378
1379 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1380                                      struct ieee80211_sub_if_data *sdata)
1381 {
1382         struct ieee80211_chanctx_conf *conf;
1383         struct ieee80211_chanctx *ctx;
1384
1385         if (!local->use_chanctx)
1386                 return;
1387
1388         mutex_lock(&local->chanctx_mtx);
1389         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1390                                          lockdep_is_held(&local->chanctx_mtx));
1391         if (conf) {
1392                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1393                 drv_assign_vif_chanctx(local, sdata, ctx);
1394         }
1395         mutex_unlock(&local->chanctx_mtx);
1396 }
1397
1398 int ieee80211_reconfig(struct ieee80211_local *local)
1399 {
1400         struct ieee80211_hw *hw = &local->hw;
1401         struct ieee80211_sub_if_data *sdata;
1402         struct ieee80211_chanctx *ctx;
1403         struct sta_info *sta;
1404         int res, i;
1405         bool reconfig_due_to_wowlan = false;
1406
1407 #ifdef CONFIG_PM
1408         if (local->suspended)
1409                 local->resuming = true;
1410
1411         if (local->wowlan) {
1412                 local->wowlan = false;
1413                 res = drv_resume(local);
1414                 if (res < 0) {
1415                         local->resuming = false;
1416                         return res;
1417                 }
1418                 if (res == 0)
1419                         goto wake_up;
1420                 WARN_ON(res > 1);
1421                 /*
1422                  * res is 1, which means the driver requested
1423                  * to go through a regular reset on wakeup.
1424                  */
1425                 reconfig_due_to_wowlan = true;
1426         }
1427 #endif
1428         /* everything else happens only if HW was up & running */
1429         if (!local->open_count)
1430                 goto wake_up;
1431
1432         /*
1433          * Upon resume hardware can sometimes be goofy due to
1434          * various platform / driver / bus issues, so restarting
1435          * the device may at times not work immediately. Propagate
1436          * the error.
1437          */
1438         res = drv_start(local);
1439         if (res) {
1440                 WARN(local->suspended, "Hardware became unavailable "
1441                      "upon resume. This could be a software issue "
1442                      "prior to suspend or a hardware issue.\n");
1443                 return res;
1444         }
1445
1446         /* setup fragmentation threshold */
1447         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1448
1449         /* setup RTS threshold */
1450         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1451
1452         /* reset coverage class */
1453         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1454
1455         ieee80211_led_radio(local, true);
1456         ieee80211_mod_tpt_led_trig(local,
1457                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1458
1459         /* add interfaces */
1460         sdata = rtnl_dereference(local->monitor_sdata);
1461         if (sdata) {
1462                 res = drv_add_interface(local, sdata);
1463                 if (WARN_ON(res)) {
1464                         rcu_assign_pointer(local->monitor_sdata, NULL);
1465                         synchronize_net();
1466                         kfree(sdata);
1467                 }
1468         }
1469
1470         list_for_each_entry(sdata, &local->interfaces, list) {
1471                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1472                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1473                     ieee80211_sdata_running(sdata))
1474                         res = drv_add_interface(local, sdata);
1475         }
1476
1477         /* add channel contexts */
1478         if (local->use_chanctx) {
1479                 mutex_lock(&local->chanctx_mtx);
1480                 list_for_each_entry(ctx, &local->chanctx_list, list)
1481                         WARN_ON(drv_add_chanctx(local, ctx));
1482                 mutex_unlock(&local->chanctx_mtx);
1483         }
1484
1485         list_for_each_entry(sdata, &local->interfaces, list) {
1486                 if (!ieee80211_sdata_running(sdata))
1487                         continue;
1488                 ieee80211_assign_chanctx(local, sdata);
1489         }
1490
1491         sdata = rtnl_dereference(local->monitor_sdata);
1492         if (sdata && ieee80211_sdata_running(sdata))
1493                 ieee80211_assign_chanctx(local, sdata);
1494
1495         /* add STAs back */
1496         mutex_lock(&local->sta_mtx);
1497         list_for_each_entry(sta, &local->sta_list, list) {
1498                 enum ieee80211_sta_state state;
1499
1500                 if (!sta->uploaded)
1501                         continue;
1502
1503                 /* AP-mode stations will be added later */
1504                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1505                         continue;
1506
1507                 for (state = IEEE80211_STA_NOTEXIST;
1508                      state < sta->sta_state; state++)
1509                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1510                                               state + 1));
1511         }
1512         mutex_unlock(&local->sta_mtx);
1513
1514         /* reconfigure tx conf */
1515         if (hw->queues >= IEEE80211_NUM_ACS) {
1516                 list_for_each_entry(sdata, &local->interfaces, list) {
1517                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1518                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1519                             !ieee80211_sdata_running(sdata))
1520                                 continue;
1521
1522                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1523                                 drv_conf_tx(local, sdata, i,
1524                                             &sdata->tx_conf[i]);
1525                 }
1526         }
1527
1528         /* reconfigure hardware */
1529         ieee80211_hw_config(local, ~0);
1530
1531         ieee80211_configure_filter(local);
1532
1533         /* Finally also reconfigure all the BSS information */
1534         list_for_each_entry(sdata, &local->interfaces, list) {
1535                 u32 changed;
1536
1537                 if (!ieee80211_sdata_running(sdata))
1538                         continue;
1539
1540                 /* common change flags for all interface types */
1541                 changed = BSS_CHANGED_ERP_CTS_PROT |
1542                           BSS_CHANGED_ERP_PREAMBLE |
1543                           BSS_CHANGED_ERP_SLOT |
1544                           BSS_CHANGED_HT |
1545                           BSS_CHANGED_BASIC_RATES |
1546                           BSS_CHANGED_BEACON_INT |
1547                           BSS_CHANGED_BSSID |
1548                           BSS_CHANGED_CQM |
1549                           BSS_CHANGED_QOS |
1550                           BSS_CHANGED_IDLE |
1551                           BSS_CHANGED_TXPOWER;
1552
1553                 switch (sdata->vif.type) {
1554                 case NL80211_IFTYPE_STATION:
1555                         changed |= BSS_CHANGED_ASSOC |
1556                                    BSS_CHANGED_ARP_FILTER |
1557                                    BSS_CHANGED_PS;
1558
1559                         if (sdata->u.mgd.dtim_period)
1560                                 changed |= BSS_CHANGED_DTIM_PERIOD;
1561
1562                         mutex_lock(&sdata->u.mgd.mtx);
1563                         ieee80211_bss_info_change_notify(sdata, changed);
1564                         mutex_unlock(&sdata->u.mgd.mtx);
1565                         break;
1566                 case NL80211_IFTYPE_ADHOC:
1567                         changed |= BSS_CHANGED_IBSS;
1568                         /* fall through */
1569                 case NL80211_IFTYPE_AP:
1570                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1571
1572                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1573                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1574
1575                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1576                                         drv_start_ap(local, sdata);
1577                         }
1578
1579                         /* fall through */
1580                 case NL80211_IFTYPE_MESH_POINT:
1581                         if (sdata->vif.bss_conf.enable_beacon) {
1582                                 changed |= BSS_CHANGED_BEACON |
1583                                            BSS_CHANGED_BEACON_ENABLED;
1584                                 ieee80211_bss_info_change_notify(sdata, changed);
1585                         }
1586                         break;
1587                 case NL80211_IFTYPE_WDS:
1588                         break;
1589                 case NL80211_IFTYPE_AP_VLAN:
1590                 case NL80211_IFTYPE_MONITOR:
1591                         /* ignore virtual */
1592                         break;
1593                 case NL80211_IFTYPE_P2P_DEVICE:
1594                         changed = BSS_CHANGED_IDLE;
1595                         break;
1596                 case NL80211_IFTYPE_UNSPECIFIED:
1597                 case NUM_NL80211_IFTYPES:
1598                 case NL80211_IFTYPE_P2P_CLIENT:
1599                 case NL80211_IFTYPE_P2P_GO:
1600                         WARN_ON(1);
1601                         break;
1602                 }
1603         }
1604
1605         ieee80211_recalc_ps(local, -1);
1606
1607         /*
1608          * The sta might be in psm against the ap (e.g. because
1609          * this was the state before a hw restart), so we
1610          * explicitly send a null packet in order to make sure
1611          * it'll sync against the ap (and get out of psm).
1612          */
1613         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1614                 list_for_each_entry(sdata, &local->interfaces, list) {
1615                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1616                                 continue;
1617                         if (!sdata->u.mgd.associated)
1618                                 continue;
1619
1620                         ieee80211_send_nullfunc(local, sdata, 0);
1621                 }
1622         }
1623
1624         /* APs are now beaconing, add back stations */
1625         mutex_lock(&local->sta_mtx);
1626         list_for_each_entry(sta, &local->sta_list, list) {
1627                 enum ieee80211_sta_state state;
1628
1629                 if (!sta->uploaded)
1630                         continue;
1631
1632                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1633                         continue;
1634
1635                 for (state = IEEE80211_STA_NOTEXIST;
1636                      state < sta->sta_state; state++)
1637                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1638                                               state + 1));
1639         }
1640         mutex_unlock(&local->sta_mtx);
1641
1642         /* add back keys */
1643         list_for_each_entry(sdata, &local->interfaces, list)
1644                 if (ieee80211_sdata_running(sdata))
1645                         ieee80211_enable_keys(sdata);
1646
1647  wake_up:
1648         local->in_reconfig = false;
1649         barrier();
1650
1651         /*
1652          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1653          * sessions can be established after a resume.
1654          *
1655          * Also tear down aggregation sessions since reconfiguring
1656          * them in a hardware restart scenario is not easily done
1657          * right now, and the hardware will have lost information
1658          * about the sessions, but we and the AP still think they
1659          * are active. This is really a workaround though.
1660          */
1661         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1662                 mutex_lock(&local->sta_mtx);
1663
1664                 list_for_each_entry(sta, &local->sta_list, list) {
1665                         ieee80211_sta_tear_down_BA_sessions(
1666                                         sta, AGG_STOP_LOCAL_REQUEST);
1667                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1668                 }
1669
1670                 mutex_unlock(&local->sta_mtx);
1671         }
1672
1673         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1674                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1675
1676         /*
1677          * If this is for hw restart things are still running.
1678          * We may want to change that later, however.
1679          */
1680         if (!local->suspended || reconfig_due_to_wowlan)
1681                 drv_restart_complete(local);
1682
1683         if (!local->suspended)
1684                 return 0;
1685
1686 #ifdef CONFIG_PM
1687         /* first set suspended false, then resuming */
1688         local->suspended = false;
1689         mb();
1690         local->resuming = false;
1691
1692         mod_timer(&local->sta_cleanup, jiffies + 1);
1693 #else
1694         WARN_ON(1);
1695 #endif
1696         return 0;
1697 }
1698
1699 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1700 {
1701         struct ieee80211_sub_if_data *sdata;
1702         struct ieee80211_local *local;
1703         struct ieee80211_key *key;
1704
1705         if (WARN_ON(!vif))
1706                 return;
1707
1708         sdata = vif_to_sdata(vif);
1709         local = sdata->local;
1710
1711         if (WARN_ON(!local->resuming))
1712                 return;
1713
1714         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1715                 return;
1716
1717         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1718
1719         mutex_lock(&local->key_mtx);
1720         list_for_each_entry(key, &sdata->key_list, list)
1721                 key->flags |= KEY_FLAG_TAINTED;
1722         mutex_unlock(&local->key_mtx);
1723 }
1724 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1725
1726 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1727 {
1728         struct ieee80211_local *local = sdata->local;
1729         struct ieee80211_chanctx_conf *chanctx_conf;
1730         struct ieee80211_chanctx *chanctx;
1731
1732         mutex_lock(&local->chanctx_mtx);
1733
1734         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1735                                         lockdep_is_held(&local->chanctx_mtx));
1736
1737         if (WARN_ON_ONCE(!chanctx_conf))
1738                 goto unlock;
1739
1740         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1741         ieee80211_recalc_smps_chanctx(local, chanctx);
1742  unlock:
1743         mutex_unlock(&local->chanctx_mtx);
1744 }
1745
1746 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1747 {
1748         int i;
1749
1750         for (i = 0; i < n_ids; i++)
1751                 if (ids[i] == id)
1752                         return true;
1753         return false;
1754 }
1755
1756 /**
1757  * ieee80211_ie_split - split an IE buffer according to ordering
1758  *
1759  * @ies: the IE buffer
1760  * @ielen: the length of the IE buffer
1761  * @ids: an array with element IDs that are allowed before
1762  *      the split
1763  * @n_ids: the size of the element ID array
1764  * @offset: offset where to start splitting in the buffer
1765  *
1766  * This function splits an IE buffer by updating the @offset
1767  * variable to point to the location where the buffer should be
1768  * split.
1769  *
1770  * It assumes that the given IE buffer is well-formed, this
1771  * has to be guaranteed by the caller!
1772  *
1773  * It also assumes that the IEs in the buffer are ordered
1774  * correctly, if not the result of using this function will not
1775  * be ordered correctly either, i.e. it does no reordering.
1776  *
1777  * The function returns the offset where the next part of the
1778  * buffer starts, which may be @ielen if the entire (remainder)
1779  * of the buffer should be used.
1780  */
1781 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1782                           const u8 *ids, int n_ids, size_t offset)
1783 {
1784         size_t pos = offset;
1785
1786         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1787                 pos += 2 + ies[pos + 1];
1788
1789         return pos;
1790 }
1791
1792 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1793 {
1794         size_t pos = offset;
1795
1796         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1797                 pos += 2 + ies[pos + 1];
1798
1799         return pos;
1800 }
1801
1802 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1803                                             int rssi_min_thold,
1804                                             int rssi_max_thold)
1805 {
1806         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1807
1808         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1809                 return;
1810
1811         /*
1812          * Scale up threshold values before storing it, as the RSSI averaging
1813          * algorithm uses a scaled up value as well. Change this scaling
1814          * factor if the RSSI averaging algorithm changes.
1815          */
1816         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1817         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1818 }
1819
1820 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1821                                     int rssi_min_thold,
1822                                     int rssi_max_thold)
1823 {
1824         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1825
1826         WARN_ON(rssi_min_thold == rssi_max_thold ||
1827                 rssi_min_thold > rssi_max_thold);
1828
1829         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1830                                        rssi_max_thold);
1831 }
1832 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1833
1834 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1835 {
1836         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1837
1838         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1839 }
1840 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1841
1842 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1843                               u16 cap)
1844 {
1845         __le16 tmp;
1846
1847         *pos++ = WLAN_EID_HT_CAPABILITY;
1848         *pos++ = sizeof(struct ieee80211_ht_cap);
1849         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1850
1851         /* capability flags */
1852         tmp = cpu_to_le16(cap);
1853         memcpy(pos, &tmp, sizeof(u16));
1854         pos += sizeof(u16);
1855
1856         /* AMPDU parameters */
1857         *pos++ = ht_cap->ampdu_factor |
1858                  (ht_cap->ampdu_density <<
1859                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1860
1861         /* MCS set */
1862         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1863         pos += sizeof(ht_cap->mcs);
1864
1865         /* extended capabilities */
1866         pos += sizeof(__le16);
1867
1868         /* BF capabilities */
1869         pos += sizeof(__le32);
1870
1871         /* antenna selection */
1872         pos += sizeof(u8);
1873
1874         return pos;
1875 }
1876
1877 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1878                                u32 cap)
1879 {
1880         __le32 tmp;
1881
1882         *pos++ = WLAN_EID_VHT_CAPABILITY;
1883         *pos++ = sizeof(struct ieee80211_vht_cap);
1884         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1885
1886         /* capability flags */
1887         tmp = cpu_to_le32(cap);
1888         memcpy(pos, &tmp, sizeof(u32));
1889         pos += sizeof(u32);
1890
1891         /* VHT MCS set */
1892         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1893         pos += sizeof(vht_cap->vht_mcs);
1894
1895         return pos;
1896 }
1897
1898 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1899                                const struct cfg80211_chan_def *chandef,
1900                                u16 prot_mode)
1901 {
1902         struct ieee80211_ht_operation *ht_oper;
1903         /* Build HT Information */
1904         *pos++ = WLAN_EID_HT_OPERATION;
1905         *pos++ = sizeof(struct ieee80211_ht_operation);
1906         ht_oper = (struct ieee80211_ht_operation *)pos;
1907         ht_oper->primary_chan = ieee80211_frequency_to_channel(
1908                                         chandef->chan->center_freq);
1909         switch (chandef->width) {
1910         case NL80211_CHAN_WIDTH_160:
1911         case NL80211_CHAN_WIDTH_80P80:
1912         case NL80211_CHAN_WIDTH_80:
1913         case NL80211_CHAN_WIDTH_40:
1914                 if (chandef->center_freq1 > chandef->chan->center_freq)
1915                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1916                 else
1917                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1918                 break;
1919         default:
1920                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1921                 break;
1922         }
1923         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1924             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
1925             chandef->width != NL80211_CHAN_WIDTH_20)
1926                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1927
1928         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1929         ht_oper->stbc_param = 0x0000;
1930
1931         /* It seems that Basic MCS set and Supported MCS set
1932            are identical for the first 10 bytes */
1933         memset(&ht_oper->basic_set, 0, 16);
1934         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1935
1936         return pos + sizeof(struct ieee80211_ht_operation);
1937 }
1938
1939 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
1940                                   const struct ieee80211_ht_operation *ht_oper,
1941                                   struct cfg80211_chan_def *chandef)
1942 {
1943         enum nl80211_channel_type channel_type;
1944
1945         if (!ht_oper) {
1946                 cfg80211_chandef_create(chandef, control_chan,
1947                                         NL80211_CHAN_NO_HT);
1948                 return;
1949         }
1950
1951         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1952         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1953                 channel_type = NL80211_CHAN_HT20;
1954                 break;
1955         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1956                 channel_type = NL80211_CHAN_HT40PLUS;
1957                 break;
1958         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1959                 channel_type = NL80211_CHAN_HT40MINUS;
1960                 break;
1961         default:
1962                 channel_type = NL80211_CHAN_NO_HT;
1963         }
1964
1965         cfg80211_chandef_create(chandef, control_chan, channel_type);
1966 }
1967
1968 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1969                             struct sk_buff *skb, bool need_basic,
1970                             enum ieee80211_band band)
1971 {
1972         struct ieee80211_local *local = sdata->local;
1973         struct ieee80211_supported_band *sband;
1974         int rate;
1975         u8 i, rates, *pos;
1976         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1977
1978         sband = local->hw.wiphy->bands[band];
1979         rates = sband->n_bitrates;
1980         if (rates > 8)
1981                 rates = 8;
1982
1983         if (skb_tailroom(skb) < rates + 2)
1984                 return -ENOMEM;
1985
1986         pos = skb_put(skb, rates + 2);
1987         *pos++ = WLAN_EID_SUPP_RATES;
1988         *pos++ = rates;
1989         for (i = 0; i < rates; i++) {
1990                 u8 basic = 0;
1991                 if (need_basic && basic_rates & BIT(i))
1992                         basic = 0x80;
1993                 rate = sband->bitrates[i].bitrate;
1994                 *pos++ = basic | (u8) (rate / 5);
1995         }
1996
1997         return 0;
1998 }
1999
2000 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2001                                 struct sk_buff *skb, bool need_basic,
2002                                 enum ieee80211_band band)
2003 {
2004         struct ieee80211_local *local = sdata->local;
2005         struct ieee80211_supported_band *sband;
2006         int rate;
2007         u8 i, exrates, *pos;
2008         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2009
2010         sband = local->hw.wiphy->bands[band];
2011         exrates = sband->n_bitrates;
2012         if (exrates > 8)
2013                 exrates -= 8;
2014         else
2015                 exrates = 0;
2016
2017         if (skb_tailroom(skb) < exrates + 2)
2018                 return -ENOMEM;
2019
2020         if (exrates) {
2021                 pos = skb_put(skb, exrates + 2);
2022                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2023                 *pos++ = exrates;
2024                 for (i = 8; i < sband->n_bitrates; i++) {
2025                         u8 basic = 0;
2026                         if (need_basic && basic_rates & BIT(i))
2027                                 basic = 0x80;
2028                         rate = sband->bitrates[i].bitrate;
2029                         *pos++ = basic | (u8) (rate / 5);
2030                 }
2031         }
2032         return 0;
2033 }
2034
2035 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2036 {
2037         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2038         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2039
2040         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2041                 /* non-managed type inferfaces */
2042                 return 0;
2043         }
2044         return ifmgd->ave_beacon_signal / 16;
2045 }
2046 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2047
2048 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2049 {
2050         if (!mcs)
2051                 return 1;
2052
2053         /* TODO: consider rx_highest */
2054
2055         if (mcs->rx_mask[3])
2056                 return 4;
2057         if (mcs->rx_mask[2])
2058                 return 3;
2059         if (mcs->rx_mask[1])
2060                 return 2;
2061         return 1;
2062 }
2063
2064 /**
2065  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2066  * @local: mac80211 hw info struct
2067  * @status: RX status
2068  * @mpdu_len: total MPDU length (including FCS)
2069  * @mpdu_offset: offset into MPDU to calculate timestamp at
2070  *
2071  * This function calculates the RX timestamp at the given MPDU offset, taking
2072  * into account what the RX timestamp was. An offset of 0 will just normalize
2073  * the timestamp to TSF at beginning of MPDU reception.
2074  */
2075 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2076                                      struct ieee80211_rx_status *status,
2077                                      unsigned int mpdu_len,
2078                                      unsigned int mpdu_offset)
2079 {
2080         u64 ts = status->mactime;
2081         struct rate_info ri;
2082         u16 rate;
2083
2084         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2085                 return 0;
2086
2087         memset(&ri, 0, sizeof(ri));
2088
2089         /* Fill cfg80211 rate info */
2090         if (status->flag & RX_FLAG_HT) {
2091                 ri.mcs = status->rate_idx;
2092                 ri.flags |= RATE_INFO_FLAGS_MCS;
2093                 if (status->flag & RX_FLAG_40MHZ)
2094                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2095                 if (status->flag & RX_FLAG_SHORT_GI)
2096                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2097         } else if (status->flag & RX_FLAG_VHT) {
2098                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2099                 ri.mcs = status->rate_idx;
2100                 ri.nss = status->vht_nss;
2101                 if (status->flag & RX_FLAG_40MHZ)
2102                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2103                 if (status->flag & RX_FLAG_80MHZ)
2104                         ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2105                 if (status->flag & RX_FLAG_80P80MHZ)
2106                         ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2107                 if (status->flag & RX_FLAG_160MHZ)
2108                         ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2109                 if (status->flag & RX_FLAG_SHORT_GI)
2110                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2111         } else {
2112                 struct ieee80211_supported_band *sband;
2113
2114                 sband = local->hw.wiphy->bands[status->band];
2115                 ri.legacy = sband->bitrates[status->rate_idx].bitrate;
2116         }
2117
2118         rate = cfg80211_calculate_bitrate(&ri);
2119
2120         /* rewind from end of MPDU */
2121         if (status->flag & RX_FLAG_MACTIME_END)
2122                 ts -= mpdu_len * 8 * 10 / rate;
2123
2124         ts += mpdu_offset * 8 * 10 / rate;
2125
2126         return ts;
2127 }
2128
2129 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2130 {
2131         struct ieee80211_sub_if_data *sdata;
2132
2133         mutex_lock(&local->iflist_mtx);
2134         list_for_each_entry(sdata, &local->interfaces, list) {
2135                 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
2136
2137                 if (sdata->wdev.cac_started) {
2138                         ieee80211_vif_release_channel(sdata);
2139                         cfg80211_cac_event(sdata->dev,
2140                                            NL80211_RADAR_CAC_ABORTED,
2141                                            GFP_KERNEL);
2142                 }
2143         }
2144         mutex_unlock(&local->iflist_mtx);
2145 }
2146
2147 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2148 {
2149         struct ieee80211_local *local =
2150                 container_of(work, struct ieee80211_local, radar_detected_work);
2151         struct cfg80211_chan_def chandef;
2152
2153         ieee80211_dfs_cac_cancel(local);
2154
2155         if (local->use_chanctx)
2156                 /* currently not handled */
2157                 WARN_ON(1);
2158         else {
2159                 chandef = local->hw.conf.chandef;
2160                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2161         }
2162 }
2163
2164 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2165 {
2166         struct ieee80211_local *local = hw_to_local(hw);
2167
2168         trace_api_radar_detected(local);
2169
2170         ieee80211_queue_work(hw, &local->radar_detected_work);
2171 }
2172 EXPORT_SYMBOL(ieee80211_radar_detected);