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                              int shift)
 112 {
 113         int dur;
 114
 115         /* calculate duration (in microseconds, rounded up to next higher
 116          * integer if it includes a fractional microsecond) to send frame of
 117          * len bytes (does not include FCS) at the given rate. Duration will
 118          * also include SIFS.
 119          *
 120          * rate is in 100 kbps, so divident is multiplied by 10 in the
 121          * DIV_ROUND_UP() operations.
 122          *
 123          * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
 124          * is assumed to be 0 otherwise.
 125          */
 126
 127         if (band == IEEE80211_BAND_5GHZ || erp) {
 128                 /*
 129                  * OFDM:
 130                  *
 131                  * N_DBPS = DATARATE x 4
 132                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 133                  *      (16 = SIGNAL time, 6 = tail bits)
 134                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 135                  *
 136                  * T_SYM = 4 usec
 137                  * 802.11a - 18.5.2: aSIFSTime = 16 usec
 138                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 139                  *      signal ext = 6 usec
 140                  */
 141                 dur = 16; /* SIFS + signal ext */
 142                 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
 143                 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
 144
 145                 /* IEEE 802.11-2012 18.3.2.4: all values above are:
 146                  *  * times 4 for 5 MHz
 147                  *  * times 2 for 10 MHz
 148                  */
 149                 dur *= 1 << shift;
 150
 151                 /* rates should already consider the channel bandwidth,
 152                  * don't apply divisor again.
 153                  */
 154                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 155                                         4 * rate); /* T_SYM x N_SYM */
 156         } else {
 157                 /*
 158                  * 802.11b or 802.11g with 802.11b compatibility:
 159                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 160                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 161                  *
 162                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 163                  * aSIFSTime = 10 usec
 164                  * aPreambleLength = 144 usec or 72 usec with short preamble
 165                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 166                  */
 167                 dur = 10; /* aSIFSTime = 10 usec */
 168                 dur += short_preamble ? (72 + 24) : (144 + 48);
 169
 170                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 171         }
 172
 173         return dur;
 174 }
 175
 176 /* Exported duration function for driver use */
 177 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 178                                         struct ieee80211_vif *vif,
 179                                         enum ieee80211_band band,
 180                                         size_t frame_len,
 181                                         struct ieee80211_rate *rate)
 182 {
 183         struct ieee80211_sub_if_data *sdata;
 184         u16 dur;
 185         int erp, shift = 0;
 186         bool short_preamble = false;
 187
 188         erp = 0;
 189         if (vif) {
 190                 sdata = vif_to_sdata(vif);
 191                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 192                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 193                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 194                 shift = ieee80211_vif_get_shift(vif);
 195         }
 196
 197         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 198                                        short_preamble, shift);
 199
 200         return cpu_to_le16(dur);
 201 }
 202 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 203
 204 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 205                               struct ieee80211_vif *vif, size_t frame_len,
 206                               const struct ieee80211_tx_info *frame_txctl)
 207 {
 208         struct ieee80211_local *local = hw_to_local(hw);
 209         struct ieee80211_rate *rate;
 210         struct ieee80211_sub_if_data *sdata;
 211         bool short_preamble;
 212         int erp, shift = 0, bitrate;
 213         u16 dur;
 214         struct ieee80211_supported_band *sband;
 215
 216         sband = local->hw.wiphy->bands[frame_txctl->band];
 217
 218         short_preamble = false;
 219
 220         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 221
 222         erp = 0;
 223         if (vif) {
 224                 sdata = vif_to_sdata(vif);
 225                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 226                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 227                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 228                 shift = ieee80211_vif_get_shift(vif);
 229         }
 230
 231         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 232
 233         /* CTS duration */
 234         dur = ieee80211_frame_duration(sband->band, 10, bitrate,
 235                                        erp, short_preamble, shift);
 236         /* Data frame duration */
 237         dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
 238                                         erp, short_preamble, shift);
 239         /* ACK duration */
 240         dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 241                                         erp, short_preamble, shift);
 242
 243         return cpu_to_le16(dur);
 244 }
 245 EXPORT_SYMBOL(ieee80211_rts_duration);
 246
 247 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 248                                     struct ieee80211_vif *vif,
 249                                     size_t frame_len,
 250                                     const struct ieee80211_tx_info *frame_txctl)
 251 {
 252         struct ieee80211_local *local = hw_to_local(hw);
 253         struct ieee80211_rate *rate;
 254         struct ieee80211_sub_if_data *sdata;
 255         bool short_preamble;
 256         int erp, shift = 0, bitrate;
 257         u16 dur;
 258         struct ieee80211_supported_band *sband;
 259
 260         sband = local->hw.wiphy->bands[frame_txctl->band];
 261
 262         short_preamble = false;
 263
 264         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 265         erp = 0;
 266         if (vif) {
 267                 sdata = vif_to_sdata(vif);
 268                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 269                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 270                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 271                 shift = ieee80211_vif_get_shift(vif);
 272         }
 273
 274         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
 275
 276         /* Data frame duration */
 277         dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
 278                                        erp, short_preamble, shift);
 279         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 280                 /* ACK duration */
 281                 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
 282                                                 erp, short_preamble, shift);
 283         }
 284
 285         return cpu_to_le16(dur);
 286 }
 287 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 288
 289 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 290 {
 291         struct ieee80211_sub_if_data *sdata;
 292         int n_acs = IEEE80211_NUM_ACS;
 293
 294         if (local->hw.queues < IEEE80211_NUM_ACS)
 295                 n_acs = 1;
 296
 297         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 298                 int ac;
 299
 300                 if (!sdata->dev)
 301                         continue;
 302
 303                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 304                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 305                         continue;
 306
 307                 for (ac = 0; ac < n_acs; ac++) {
 308                         int ac_queue = sdata->vif.hw_queue[ac];
 309
 310                         if (ac_queue == queue ||
 311                             (sdata->vif.cab_queue == queue &&
 312                              local->queue_stop_reasons[ac_queue] == 0 &&
 313                              skb_queue_empty(&local->pending[ac_queue])))
 314                                 netif_wake_subqueue(sdata->dev, ac);
 315                 }
 316         }
 317 }
 318
 319 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 320                                    enum queue_stop_reason reason)
 321 {
 322         struct ieee80211_local *local = hw_to_local(hw);
 323
 324         trace_wake_queue(local, queue, reason);
 325
 326         if (WARN_ON(queue >= hw->queues))
 327                 return;
 328
 329         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 330                 return;
 331
 332         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 333
 334         if (local->queue_stop_reasons[queue] != 0)
 335                 /* someone still has this queue stopped */
 336                 return;
 337
 338         if (skb_queue_empty(&local->pending[queue])) {
 339                 rcu_read_lock();
 340                 ieee80211_propagate_queue_wake(local, queue);
 341                 rcu_read_unlock();
 342         } else
 343                 tasklet_schedule(&local->tx_pending_tasklet);
 344 }
 345
 346 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 347                                     enum queue_stop_reason reason)
 348 {
 349         struct ieee80211_local *local = hw_to_local(hw);
 350         unsigned long flags;
 351
 352         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 353         __ieee80211_wake_queue(hw, queue, reason);
 354         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 355 }
 356
 357 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 358 {
 359         ieee80211_wake_queue_by_reason(hw, queue,
 360                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 361 }
 362 EXPORT_SYMBOL(ieee80211_wake_queue);
 363
 364 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 365                                    enum queue_stop_reason reason)
 366 {
 367         struct ieee80211_local *local = hw_to_local(hw);
 368         struct ieee80211_sub_if_data *sdata;
 369         int n_acs = IEEE80211_NUM_ACS;
 370
 371         trace_stop_queue(local, queue, reason);
 372
 373         if (WARN_ON(queue >= hw->queues))
 374                 return;
 375
 376         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 377                 return;
 378
 379         __set_bit(reason, &local->queue_stop_reasons[queue]);
 380
 381         if (local->hw.queues < IEEE80211_NUM_ACS)
 382                 n_acs = 1;
 383
 384         rcu_read_lock();
 385         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 386                 int ac;
 387
 388                 if (!sdata->dev)
 389                         continue;
 390
 391                 for (ac = 0; ac < n_acs; ac++) {
 392                         if (sdata->vif.hw_queue[ac] == queue ||
 393                             sdata->vif.cab_queue == queue)
 394                                 netif_stop_subqueue(sdata->dev, ac);
 395                 }
 396         }
 397         rcu_read_unlock();
 398 }
 399
 400 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 401                                     enum queue_stop_reason reason)
 402 {
 403         struct ieee80211_local *local = hw_to_local(hw);
 404         unsigned long flags;
 405
 406         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 407         __ieee80211_stop_queue(hw, queue, reason);
 408         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 409 }
 410
 411 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 412 {
 413         ieee80211_stop_queue_by_reason(hw, queue,
 414                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 415 }
 416 EXPORT_SYMBOL(ieee80211_stop_queue);
 417
 418 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 419                                struct sk_buff *skb)
 420 {
 421         struct ieee80211_hw *hw = &local->hw;
 422         unsigned long flags;
 423         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 424         int queue = info->hw_queue;
 425
 426         if (WARN_ON(!info->control.vif)) {
 427                 ieee80211_free_txskb(&local->hw, skb);
 428                 return;
 429         }
 430
 431         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 432         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 433         __skb_queue_tail(&local->pending[queue], skb);
 434         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 435         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 436 }
 437
 438 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 439                                    struct sk_buff_head *skbs,
 440                                    void (*fn)(void *data), void *data)
 441 {
 442         struct ieee80211_hw *hw = &local->hw;
 443         struct sk_buff *skb;
 444         unsigned long flags;
 445         int queue, i;
 446
 447         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 448         while ((skb = skb_dequeue(skbs))) {
 449                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 450
 451                 if (WARN_ON(!info->control.vif)) {
 452                         ieee80211_free_txskb(&local->hw, skb);
 453                         continue;
 454                 }
 455
 456                 queue = info->hw_queue;
 457
 458                 __ieee80211_stop_queue(hw, queue,
 459                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 460
 461                 __skb_queue_tail(&local->pending[queue], skb);
 462         }
 463
 464         if (fn)
 465                 fn(data);
 466
 467         for (i = 0; i < hw->queues; i++)
 468                 __ieee80211_wake_queue(hw, i,
 469                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 470         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 471 }
 472
 473 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 474                                      unsigned long queues,
 475                                      enum queue_stop_reason reason)
 476 {
 477         struct ieee80211_local *local = hw_to_local(hw);
 478         unsigned long flags;
 479         int i;
 480
 481         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 482
 483         for_each_set_bit(i, &queues, hw->queues)
 484                 __ieee80211_stop_queue(hw, i, reason);
 485
 486         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 487 }
 488
 489 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 490 {
 491         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 492                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 493 }
 494 EXPORT_SYMBOL(ieee80211_stop_queues);
 495
 496 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 497 {
 498         struct ieee80211_local *local = hw_to_local(hw);
 499         unsigned long flags;
 500         int ret;
 501
 502         if (WARN_ON(queue >= hw->queues))
 503                 return true;
 504
 505         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 506         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
 507                        &local->queue_stop_reasons[queue]);
 508         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 509         return ret;
 510 }
 511 EXPORT_SYMBOL(ieee80211_queue_stopped);
 512
 513 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 514                                      unsigned long queues,
 515                                      enum queue_stop_reason reason)
 516 {
 517         struct ieee80211_local *local = hw_to_local(hw);
 518         unsigned long flags;
 519         int i;
 520
 521         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 522
 523         for_each_set_bit(i, &queues, hw->queues)
 524                 __ieee80211_wake_queue(hw, i, reason);
 525
 526         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 527 }
 528
 529 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 530 {
 531         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 532                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 533 }
 534 EXPORT_SYMBOL(ieee80211_wake_queues);
 535
 536 void ieee80211_flush_queues(struct ieee80211_local *local,
 537                             struct ieee80211_sub_if_data *sdata)
 538 {
 539         u32 queues;
 540
 541         if (!local->ops->flush)
 542                 return;
 543
 544         if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
 545                 int ac;
 546
 547                 queues = 0;
 548
 549                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 550                         queues |= BIT(sdata->vif.hw_queue[ac]);
 551                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
 552                         queues |= BIT(sdata->vif.cab_queue);
 553         } else {
 554                 /* all queues */
 555                 queues = BIT(local->hw.queues) - 1;
 556         }
 557
 558         ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 559                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 560
 561         drv_flush(local, queues, false);
 562
 563         ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 564                                         IEEE80211_QUEUE_STOP_REASON_FLUSH);
 565 }
 566
 567 static void __iterate_active_interfaces(struct ieee80211_local *local,
 568                                         u32 iter_flags,
 569                                         void (*iterator)(void *data, u8 *mac,
 570                                                 struct ieee80211_vif *vif),
 571                                         void *data)
 572 {
 573         struct ieee80211_sub_if_data *sdata;
 574
 575         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 576                 switch (sdata->vif.type) {
 577                 case NL80211_IFTYPE_MONITOR:
 578                         if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 579                                 continue;
 580                         break;
 581                 case NL80211_IFTYPE_AP_VLAN:
 582                         continue;
 583                 default:
 584                         break;
 585                 }
 586                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
 587                     !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 588                         continue;
 589                 if (ieee80211_sdata_running(sdata))
 590                         iterator(data, sdata->vif.addr,
 591                                  &sdata->vif);
 592         }
 593
 594         sdata = rcu_dereference_check(local->monitor_sdata,
 595                                       lockdep_is_held(&local->iflist_mtx) ||
 596                                       lockdep_rtnl_is_held());
 597         if (sdata &&
 598             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
 599              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 600                 iterator(data, sdata->vif.addr, &sdata->vif);
 601 }
 602
 603 void ieee80211_iterate_active_interfaces(
 604         struct ieee80211_hw *hw, u32 iter_flags,
 605         void (*iterator)(void *data, u8 *mac,
 606                          struct ieee80211_vif *vif),
 607         void *data)
 608 {
 609         struct ieee80211_local *local = hw_to_local(hw);
 610
 611         mutex_lock(&local->iflist_mtx);
 612         __iterate_active_interfaces(local, iter_flags, iterator, data);
 613         mutex_unlock(&local->iflist_mtx);
 614 }
 615 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 616
 617 void ieee80211_iterate_active_interfaces_atomic(
 618         struct ieee80211_hw *hw, u32 iter_flags,
 619         void (*iterator)(void *data, u8 *mac,
 620                          struct ieee80211_vif *vif),
 621         void *data)
 622 {
 623         struct ieee80211_local *local = hw_to_local(hw);
 624
 625         rcu_read_lock();
 626         __iterate_active_interfaces(local, iter_flags, iterator, data);
 627         rcu_read_unlock();
 628 }
 629 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 630
 631 void ieee80211_iterate_active_interfaces_rtnl(
 632         struct ieee80211_hw *hw, u32 iter_flags,
 633         void (*iterator)(void *data, u8 *mac,
 634                          struct ieee80211_vif *vif),
 635         void *data)
 636 {
 637         struct ieee80211_local *local = hw_to_local(hw);
 638
 639         ASSERT_RTNL();
 640
 641         __iterate_active_interfaces(local, iter_flags, iterator, data);
 642 }
 643 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
 644
 645 /*
 646  * Nothing should have been stuffed into the workqueue during
 647  * the suspend->resume cycle. If this WARN is seen then there
 648  * is a bug with either the driver suspend or something in
 649  * mac80211 stuffing into the workqueue which we haven't yet
 650  * cleared during mac80211's suspend cycle.
 651  */
 652 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 653 {
 654         if (WARN(local->suspended && !local->resuming,
 655                  "queueing ieee80211 work while going to suspend\n"))
 656                 return false;
 657
 658         return true;
 659 }
 660
 661 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 662 {
 663         struct ieee80211_local *local = hw_to_local(hw);
 664
 665         if (!ieee80211_can_queue_work(local))
 666                 return;
 667
 668         queue_work(local->workqueue, work);
 669 }
 670 EXPORT_SYMBOL(ieee80211_queue_work);
 671
 672 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 673                                   struct delayed_work *dwork,
 674                                   unsigned long delay)
 675 {
 676         struct ieee80211_local *local = hw_to_local(hw);
 677
 678         if (!ieee80211_can_queue_work(local))
 679                 return;
 680
 681         queue_delayed_work(local->workqueue, dwork, delay);
 682 }
 683 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 684
 685 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 686                                struct ieee802_11_elems *elems,
 687                                u64 filter, u32 crc)
 688 {
 689         size_t left = len;
 690         const u8 *pos = start;
 691         bool calc_crc = filter != 0;
 692         DECLARE_BITMAP(seen_elems, 256);
 693         const u8 *ie;
 694
 695         bitmap_zero(seen_elems, 256);
 696         memset(elems, 0, sizeof(*elems));
 697         elems->ie_start = start;
 698         elems->total_len = len;
 699
 700         while (left >= 2) {
 701                 u8 id, elen;
 702                 bool elem_parse_failed;
 703
 704                 id = *pos++;
 705                 elen = *pos++;
 706                 left -= 2;
 707
 708                 if (elen > left) {
 709                         elems->parse_error = true;
 710                         break;
 711                 }
 712
 713                 switch (id) {
 714                 case WLAN_EID_SSID:
 715                 case WLAN_EID_SUPP_RATES:
 716                 case WLAN_EID_FH_PARAMS:
 717                 case WLAN_EID_DS_PARAMS:
 718                 case WLAN_EID_CF_PARAMS:
 719                 case WLAN_EID_TIM:
 720                 case WLAN_EID_IBSS_PARAMS:
 721                 case WLAN_EID_CHALLENGE:
 722                 case WLAN_EID_RSN:
 723                 case WLAN_EID_ERP_INFO:
 724                 case WLAN_EID_EXT_SUPP_RATES:
 725                 case WLAN_EID_HT_CAPABILITY:
 726                 case WLAN_EID_HT_OPERATION:
 727                 case WLAN_EID_VHT_CAPABILITY:
 728                 case WLAN_EID_VHT_OPERATION:
 729                 case WLAN_EID_MESH_ID:
 730                 case WLAN_EID_MESH_CONFIG:
 731                 case WLAN_EID_PEER_MGMT:
 732                 case WLAN_EID_PREQ:
 733                 case WLAN_EID_PREP:
 734                 case WLAN_EID_PERR:
 735                 case WLAN_EID_RANN:
 736                 case WLAN_EID_CHANNEL_SWITCH:
 737                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 738                 case WLAN_EID_COUNTRY:
 739                 case WLAN_EID_PWR_CONSTRAINT:
 740                 case WLAN_EID_TIMEOUT_INTERVAL:
 741                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 742                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 743                 case WLAN_EID_CHAN_SWITCH_PARAM:
 744                 /*
 745                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 746                  * that if the content gets bigger it might be needed more than once
 747                  */
 748                         if (test_bit(id, seen_elems)) {
 749                                 elems->parse_error = true;
 750                                 left -= elen;
 751                                 pos += elen;
 752                                 continue;
 753                         }
 754                         break;
 755                 }
 756
 757                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 758                         crc = crc32_be(crc, pos - 2, elen + 2);
 759
 760                 elem_parse_failed = false;
 761
 762                 switch (id) {
 763                 case WLAN_EID_SSID:
 764                         elems->ssid = pos;
 765                         elems->ssid_len = elen;
 766                         break;
 767                 case WLAN_EID_SUPP_RATES:
 768                         elems->supp_rates = pos;
 769                         elems->supp_rates_len = elen;
 770                         break;
 771                 case WLAN_EID_DS_PARAMS:
 772                         if (elen >= 1)
 773                                 elems->ds_params = pos;
 774                         else
 775                                 elem_parse_failed = true;
 776                         break;
 777                 case WLAN_EID_TIM:
 778                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 779                                 elems->tim = (void *)pos;
 780                                 elems->tim_len = elen;
 781                         } else
 782                                 elem_parse_failed = true;
 783                         break;
 784                 case WLAN_EID_CHALLENGE:
 785                         elems->challenge = pos;
 786                         elems->challenge_len = elen;
 787                         break;
 788                 case WLAN_EID_VENDOR_SPECIFIC:
 789                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 790                             pos[2] == 0xf2) {
 791                                 /* Microsoft OUI (00:50:F2) */
 792
 793                                 if (calc_crc)
 794                                         crc = crc32_be(crc, pos - 2, elen + 2);
 795
 796                                 if (elen >= 5 && pos[3] == 2) {
 797                                         /* OUI Type 2 - WMM IE */
 798                                         if (pos[4] == 0) {
 799                                                 elems->wmm_info = pos;
 800                                                 elems->wmm_info_len = elen;
 801                                         } else if (pos[4] == 1) {
 802                                                 elems->wmm_param = pos;
 803                                                 elems->wmm_param_len = elen;
 804                                         }
 805                                 }
 806                         }
 807                         break;
 808                 case WLAN_EID_RSN:
 809                         elems->rsn = pos;
 810                         elems->rsn_len = elen;
 811                         break;
 812                 case WLAN_EID_ERP_INFO:
 813                         if (elen >= 1)
 814                                 elems->erp_info = pos;
 815                         else
 816                                 elem_parse_failed = true;
 817                         break;
 818                 case WLAN_EID_EXT_SUPP_RATES:
 819                         elems->ext_supp_rates = pos;
 820                         elems->ext_supp_rates_len = elen;
 821                         break;
 822                 case WLAN_EID_HT_CAPABILITY:
 823                         if (elen >= sizeof(struct ieee80211_ht_cap))
 824                                 elems->ht_cap_elem = (void *)pos;
 825                         else
 826                                 elem_parse_failed = true;
 827                         break;
 828                 case WLAN_EID_HT_OPERATION:
 829                         if (elen >= sizeof(struct ieee80211_ht_operation))
 830                                 elems->ht_operation = (void *)pos;
 831                         else
 832                                 elem_parse_failed = true;
 833                         break;
 834                 case WLAN_EID_VHT_CAPABILITY:
 835                         if (elen >= sizeof(struct ieee80211_vht_cap))
 836                                 elems->vht_cap_elem = (void *)pos;
 837                         else
 838                                 elem_parse_failed = true;
 839                         break;
 840                 case WLAN_EID_VHT_OPERATION:
 841                         if (elen >= sizeof(struct ieee80211_vht_operation))
 842                                 elems->vht_operation = (void *)pos;
 843                         else
 844                                 elem_parse_failed = true;
 845                         break;
 846                 case WLAN_EID_OPMODE_NOTIF:
 847                         if (elen > 0)
 848                                 elems->opmode_notif = pos;
 849                         else
 850                                 elem_parse_failed = true;
 851                         break;
 852                 case WLAN_EID_MESH_ID:
 853                         elems->mesh_id = pos;
 854                         elems->mesh_id_len = elen;
 855                         break;
 856                 case WLAN_EID_MESH_CONFIG:
 857                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 858                                 elems->mesh_config = (void *)pos;
 859                         else
 860                                 elem_parse_failed = true;
 861                         break;
 862                 case WLAN_EID_PEER_MGMT:
 863                         elems->peering = pos;
 864                         elems->peering_len = elen;
 865                         break;
 866                 case WLAN_EID_MESH_AWAKE_WINDOW:
 867                         if (elen >= 2)
 868                                 elems->awake_window = (void *)pos;
 869                         break;
 870                 case WLAN_EID_PREQ:
 871                         elems->preq = pos;
 872                         elems->preq_len = elen;
 873                         break;
 874                 case WLAN_EID_PREP:
 875                         elems->prep = pos;
 876                         elems->prep_len = elen;
 877                         break;
 878                 case WLAN_EID_PERR:
 879                         elems->perr = pos;
 880                         elems->perr_len = elen;
 881                         break;
 882                 case WLAN_EID_RANN:
 883                         if (elen >= sizeof(struct ieee80211_rann_ie))
 884                                 elems->rann = (void *)pos;
 885                         else
 886                                 elem_parse_failed = true;
 887                         break;
 888                 case WLAN_EID_CHANNEL_SWITCH:
 889                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 890                                 elem_parse_failed = true;
 891                                 break;
 892                         }
 893                         elems->ch_switch_ie = (void *)pos;
 894                         break;
 895                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 896                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
 897                                 elem_parse_failed = true;
 898                                 break;
 899                         }
 900                         elems->ext_chansw_ie = (void *)pos;
 901                         break;
 902                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 903                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
 904                                 elem_parse_failed = true;
 905                                 break;
 906                         }
 907                         elems->sec_chan_offs = (void *)pos;
 908                         break;
 909                 case WLAN_EID_CHAN_SWITCH_PARAM:
 910                         if (elen !=
 911                             sizeof(*elems->mesh_chansw_params_ie)) {
 912                                 elem_parse_failed = true;
 913                                 break;
 914                         }
 915                         elems->mesh_chansw_params_ie = (void *)pos;
 916                         break;
 917                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 918                         if (!action ||
 919                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
 920                                 elem_parse_failed = true;
 921                                 break;
 922                         }
 923                         elems->wide_bw_chansw_ie = (void *)pos;
 924                         break;
 925                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
 926                         if (action) {
 927                                 elem_parse_failed = true;
 928                                 break;
 929                         }
 930                         /*
 931                          * This is a bit tricky, but as we only care about
 932                          * the wide bandwidth channel switch element, so
 933                          * just parse it out manually.
 934                          */
 935                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
 936                                               pos, elen);
 937                         if (ie) {
 938                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
 939                                         elems->wide_bw_chansw_ie =
 940                                                 (void *)(ie + 2);
 941                                 else
 942                                         elem_parse_failed = true;
 943                         }
 944                         break;
 945                 case WLAN_EID_COUNTRY:
 946                         elems->country_elem = pos;
 947                         elems->country_elem_len = elen;
 948                         break;
 949                 case WLAN_EID_PWR_CONSTRAINT:
 950                         if (elen != 1) {
 951                                 elem_parse_failed = true;
 952                                 break;
 953                         }
 954                         elems->pwr_constr_elem = pos;
 955                         break;
 956                 case WLAN_EID_TIMEOUT_INTERVAL:
 957                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
 958                                 elems->timeout_int = (void *)pos;
 959                         else
 960                                 elem_parse_failed = true;
 961                         break;
 962                 default:
 963                         break;
 964                 }
 965
 966                 if (elem_parse_failed)
 967                         elems->parse_error = true;
 968                 else
 969                         __set_bit(id, seen_elems);
 970
 971                 left -= elen;
 972                 pos += elen;
 973         }
 974
 975         if (left != 0)
 976                 elems->parse_error = true;
 977
 978         return crc;
 979 }
 980
 981 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 982                                bool bss_notify)
 983 {
 984         struct ieee80211_local *local = sdata->local;
 985         struct ieee80211_tx_queue_params qparam;
 986         struct ieee80211_chanctx_conf *chanctx_conf;
 987         int ac;
 988         bool use_11b, enable_qos;
 989         int aCWmin, aCWmax;
 990
 991         if (!local->ops->conf_tx)
 992                 return;
 993
 994         if (local->hw.queues < IEEE80211_NUM_ACS)
 995                 return;
 996
 997         memset(&qparam, 0, sizeof(qparam));
 998
 999         rcu_read_lock();
1000         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1001         use_11b = (chanctx_conf &&
1002                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1003                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1004         rcu_read_unlock();
1005
1006         /*
1007          * By default disable QoS in STA mode for old access points, which do
1008          * not support 802.11e. New APs will provide proper queue parameters,
1009          * that we will configure later.
1010          */
1011         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
1012
1013         /* Set defaults according to 802.11-2007 Table 7-37 */
1014         aCWmax = 1023;
1015         if (use_11b)
1016                 aCWmin = 31;
1017         else
1018                 aCWmin = 15;
1019
1020         /* Confiure old 802.11b/g medium access rules. */
1021         qparam.cw_max = aCWmax;
1022         qparam.cw_min = aCWmin;
1023         qparam.txop = 0;
1024         qparam.aifs = 2;
1025
1026         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1027                 /* Update if QoS is enabled. */
1028                 if (enable_qos) {
1029                         switch (ac) {
1030                         case IEEE80211_AC_BK:
1031                                 qparam.cw_max = aCWmax;
1032                                 qparam.cw_min = aCWmin;
1033                                 qparam.txop = 0;
1034                                 qparam.aifs = 7;
1035                                 break;
1036                         /* never happens but let's not leave undefined */
1037                         default:
1038                         case IEEE80211_AC_BE:
1039                                 qparam.cw_max = aCWmax;
1040                                 qparam.cw_min = aCWmin;
1041                                 qparam.txop = 0;
1042                                 qparam.aifs = 3;
1043                                 break;
1044                         case IEEE80211_AC_VI:
1045                                 qparam.cw_max = aCWmin;
1046                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1047                                 if (use_11b)
1048                                         qparam.txop = 6016/32;
1049                                 else
1050                                         qparam.txop = 3008/32;
1051                                 qparam.aifs = 2;
1052                                 break;
1053                         case IEEE80211_AC_VO:
1054                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1055                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1056                                 if (use_11b)
1057                                         qparam.txop = 3264/32;
1058                                 else
1059                                         qparam.txop = 1504/32;
1060                                 qparam.aifs = 2;
1061                                 break;
1062                         }
1063                 }
1064
1065                 qparam.uapsd = false;
1066
1067                 sdata->tx_conf[ac] = qparam;
1068                 drv_conf_tx(local, sdata, ac, &qparam);
1069         }
1070
1071         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1072             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1073                 sdata->vif.bss_conf.qos = enable_qos;
1074                 if (bss_notify)
1075                         ieee80211_bss_info_change_notify(sdata,
1076                                                          BSS_CHANGED_QOS);
1077         }
1078 }
1079
1080 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1081                          u16 transaction, u16 auth_alg, u16 status,
1082                          const u8 *extra, size_t extra_len, const u8 *da,
1083                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1084                          u32 tx_flags)
1085 {
1086         struct ieee80211_local *local = sdata->local;
1087         struct sk_buff *skb;
1088         struct ieee80211_mgmt *mgmt;
1089         int err;
1090
1091         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1092         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24 + 6 + extra_len);
1093         if (!skb)
1094                 return;
1095
1096         skb_reserve(skb, local->hw.extra_tx_headroom);
1097
1098         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1099         memset(mgmt, 0, 24 + 6);
1100         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1101                                           IEEE80211_STYPE_AUTH);
1102         memcpy(mgmt->da, da, ETH_ALEN);
1103         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1104         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1105         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1106         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1107         mgmt->u.auth.status_code = cpu_to_le16(status);
1108         if (extra)
1109                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1110
1111         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1112                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1113                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1114                 WARN_ON(err);
1115         }
1116
1117         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1118                                         tx_flags;
1119         ieee80211_tx_skb(sdata, skb);
1120 }
1121
1122 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1123                                     const u8 *bssid, u16 stype, u16 reason,
1124                                     bool send_frame, u8 *frame_buf)
1125 {
1126         struct ieee80211_local *local = sdata->local;
1127         struct sk_buff *skb;
1128         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1129
1130         /* build frame */
1131         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1132         mgmt->duration = 0; /* initialize only */
1133         mgmt->seq_ctrl = 0; /* initialize only */
1134         memcpy(mgmt->da, bssid, ETH_ALEN);
1135         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1136         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1137         /* u.deauth.reason_code == u.disassoc.reason_code */
1138         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1139
1140         if (send_frame) {
1141                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1142                                     IEEE80211_DEAUTH_FRAME_LEN);
1143                 if (!skb)
1144                         return;
1145
1146                 skb_reserve(skb, local->hw.extra_tx_headroom);
1147
1148                 /* copy in frame */
1149                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1150                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1151
1152                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1153                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1154                         IEEE80211_SKB_CB(skb)->flags |=
1155                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1156
1157                 ieee80211_tx_skb(sdata, skb);
1158         }
1159 }
1160
1161 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1162                              size_t buffer_len, const u8 *ie, size_t ie_len,
1163                              enum ieee80211_band band, u32 rate_mask,
1164                              struct cfg80211_chan_def *chandef)
1165 {
1166         struct ieee80211_supported_band *sband;
1167         u8 *pos = buffer, *end = buffer + buffer_len;
1168         size_t offset = 0, noffset;
1169         int supp_rates_len, i;
1170         u8 rates[32];
1171         int num_rates;
1172         int ext_rates_len;
1173         int shift;
1174         u32 rate_flags;
1175
1176         sband = local->hw.wiphy->bands[band];
1177         if (WARN_ON_ONCE(!sband))
1178                 return 0;
1179
1180         rate_flags = ieee80211_chandef_rate_flags(chandef);
1181         shift = ieee80211_chandef_get_shift(chandef);
1182
1183         num_rates = 0;
1184         for (i = 0; i < sband->n_bitrates; i++) {
1185                 if ((BIT(i) & rate_mask) == 0)
1186                         continue; /* skip rate */
1187                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1188                         continue;
1189
1190                 rates[num_rates++] =
1191                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1192                                           (1 << shift) * 5);
1193         }
1194
1195         supp_rates_len = min_t(int, num_rates, 8);
1196
1197         if (end - pos < 2 + supp_rates_len)
1198                 goto out_err;
1199         *pos++ = WLAN_EID_SUPP_RATES;
1200         *pos++ = supp_rates_len;
1201         memcpy(pos, rates, supp_rates_len);
1202         pos += supp_rates_len;
1203
1204         /* insert "request information" if in custom IEs */
1205         if (ie && ie_len) {
1206                 static const u8 before_extrates[] = {
1207                         WLAN_EID_SSID,
1208                         WLAN_EID_SUPP_RATES,
1209                         WLAN_EID_REQUEST,
1210                 };
1211                 noffset = ieee80211_ie_split(ie, ie_len,
1212                                              before_extrates,
1213                                              ARRAY_SIZE(before_extrates),
1214                                              offset);
1215                 if (end - pos < noffset - offset)
1216                         goto out_err;
1217                 memcpy(pos, ie + offset, noffset - offset);
1218                 pos += noffset - offset;
1219                 offset = noffset;
1220         }
1221
1222         ext_rates_len = num_rates - supp_rates_len;
1223         if (ext_rates_len > 0) {
1224                 if (end - pos < 2 + ext_rates_len)
1225                         goto out_err;
1226                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1227                 *pos++ = ext_rates_len;
1228                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1229                 pos += ext_rates_len;
1230         }
1231
1232         if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1233                 if (end - pos < 3)
1234                         goto out_err;
1235                 *pos++ = WLAN_EID_DS_PARAMS;
1236                 *pos++ = 1;
1237                 *pos++ = ieee80211_frequency_to_channel(
1238                                 chandef->chan->center_freq);
1239         }
1240
1241         /* insert custom IEs that go before HT */
1242         if (ie && ie_len) {
1243                 static const u8 before_ht[] = {
1244                         WLAN_EID_SSID,
1245                         WLAN_EID_SUPP_RATES,
1246                         WLAN_EID_REQUEST,
1247                         WLAN_EID_EXT_SUPP_RATES,
1248                         WLAN_EID_DS_PARAMS,
1249                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1250                 };
1251                 noffset = ieee80211_ie_split(ie, ie_len,
1252                                              before_ht, ARRAY_SIZE(before_ht),
1253                                              offset);
1254                 if (end - pos < noffset - offset)
1255                         goto out_err;
1256                 memcpy(pos, ie + offset, noffset - offset);
1257                 pos += noffset - offset;
1258                 offset = noffset;
1259         }
1260
1261         if (sband->ht_cap.ht_supported) {
1262                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1263                         goto out_err;
1264                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1265                                                 sband->ht_cap.cap);
1266         }
1267
1268         /*
1269          * If adding more here, adjust code in main.c
1270          * that calculates local->scan_ies_len.
1271          */
1272
1273         /* add any remaining custom IEs */
1274         if (ie && ie_len) {
1275                 noffset = ie_len;
1276                 if (end - pos < noffset - offset)
1277                         goto out_err;
1278                 memcpy(pos, ie + offset, noffset - offset);
1279                 pos += noffset - offset;
1280         }
1281
1282         if (sband->vht_cap.vht_supported) {
1283                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1284                         goto out_err;
1285                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1286                                                  sband->vht_cap.cap);
1287         }
1288
1289         return pos - buffer;
1290  out_err:
1291         WARN_ONCE(1, "not enough space for preq IEs\n");
1292         return pos - buffer;
1293 }
1294
1295 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1296                                           u8 *dst, u32 ratemask,
1297                                           struct ieee80211_channel *chan,
1298                                           const u8 *ssid, size_t ssid_len,
1299                                           const u8 *ie, size_t ie_len,
1300                                           bool directed)
1301 {
1302         struct ieee80211_local *local = sdata->local;
1303         struct cfg80211_chan_def chandef;
1304         struct sk_buff *skb;
1305         struct ieee80211_mgmt *mgmt;
1306         int ies_len;
1307
1308         /*
1309          * Do not send DS Channel parameter for directed probe requests
1310          * in order to maximize the chance that we get a response.  Some
1311          * badly-behaved APs don't respond when this parameter is included.
1312          */
1313         chandef.width = sdata->vif.bss_conf.chandef.width;
1314         if (directed)
1315                 chandef.chan = NULL;
1316         else
1317                 chandef.chan = chan;
1318
1319         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1320                                      ssid, ssid_len, 100 + ie_len);
1321         if (!skb)
1322                 return NULL;
1323
1324         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1325                                            skb_tailroom(skb),
1326                                            ie, ie_len, chan->band,
1327                                            ratemask, &chandef);
1328         skb_put(skb, ies_len);
1329
1330         if (dst) {
1331                 mgmt = (struct ieee80211_mgmt *) skb->data;
1332                 memcpy(mgmt->da, dst, ETH_ALEN);
1333                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1334         }
1335
1336         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1337
1338         return skb;
1339 }
1340
1341 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1342                               const u8 *ssid, size_t ssid_len,
1343                               const u8 *ie, size_t ie_len,
1344                               u32 ratemask, bool directed, u32 tx_flags,
1345                               struct ieee80211_channel *channel, bool scan)
1346 {
1347         struct sk_buff *skb;
1348
1349         skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1350                                         ssid, ssid_len,
1351                                         ie, ie_len, directed);
1352         if (skb) {
1353                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1354                 if (scan)
1355                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1356                 else
1357                         ieee80211_tx_skb(sdata, skb);
1358         }
1359 }
1360
1361 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1362                             struct ieee802_11_elems *elems,
1363                             enum ieee80211_band band, u32 *basic_rates)
1364 {
1365         struct ieee80211_supported_band *sband;
1366         struct ieee80211_rate *bitrates;
1367         size_t num_rates;
1368         u32 supp_rates, rate_flags;
1369         int i, j, shift;
1370         sband = sdata->local->hw.wiphy->bands[band];
1371
1372         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1373         shift = ieee80211_vif_get_shift(&sdata->vif);
1374
1375         if (WARN_ON(!sband))
1376                 return 1;
1377
1378         bitrates = sband->bitrates;
1379         num_rates = sband->n_bitrates;
1380         supp_rates = 0;
1381         for (i = 0; i < elems->supp_rates_len +
1382                      elems->ext_supp_rates_len; i++) {
1383                 u8 rate = 0;
1384                 int own_rate;
1385                 bool is_basic;
1386                 if (i < elems->supp_rates_len)
1387                         rate = elems->supp_rates[i];
1388                 else if (elems->ext_supp_rates)
1389                         rate = elems->ext_supp_rates
1390                                 [i - elems->supp_rates_len];
1391                 own_rate = 5 * (rate & 0x7f);
1392                 is_basic = !!(rate & 0x80);
1393
1394                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1395                         continue;
1396
1397                 for (j = 0; j < num_rates; j++) {
1398                         int brate;
1399                         if ((rate_flags & sband->bitrates[j].flags)
1400                             != rate_flags)
1401                                 continue;
1402
1403                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1404                                              1 << shift);
1405
1406                         if (brate == own_rate) {
1407                                 supp_rates |= BIT(j);
1408                                 if (basic_rates && is_basic)
1409                                         *basic_rates |= BIT(j);
1410                         }
1411                 }
1412         }
1413         return supp_rates;
1414 }
1415
1416 void ieee80211_stop_device(struct ieee80211_local *local)
1417 {
1418         ieee80211_led_radio(local, false);
1419         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1420
1421         cancel_work_sync(&local->reconfig_filter);
1422
1423         flush_workqueue(local->workqueue);
1424         drv_stop(local);
1425 }
1426
1427 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1428                                      struct ieee80211_sub_if_data *sdata)
1429 {
1430         struct ieee80211_chanctx_conf *conf;
1431         struct ieee80211_chanctx *ctx;
1432
1433         if (!local->use_chanctx)
1434                 return;
1435
1436         mutex_lock(&local->chanctx_mtx);
1437         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1438                                          lockdep_is_held(&local->chanctx_mtx));
1439         if (conf) {
1440                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1441                 drv_assign_vif_chanctx(local, sdata, ctx);
1442         }
1443         mutex_unlock(&local->chanctx_mtx);
1444 }
1445
1446 int ieee80211_reconfig(struct ieee80211_local *local)
1447 {
1448         struct ieee80211_hw *hw = &local->hw;
1449         struct ieee80211_sub_if_data *sdata;
1450         struct ieee80211_chanctx *ctx;
1451         struct sta_info *sta;
1452         int res, i;
1453         bool reconfig_due_to_wowlan = false;
1454
1455 #ifdef CONFIG_PM
1456         if (local->suspended)
1457                 local->resuming = true;
1458
1459         if (local->wowlan) {
1460                 res = drv_resume(local);
1461                 local->wowlan = false;
1462                 if (res < 0) {
1463                         local->resuming = false;
1464                         return res;
1465                 }
1466                 if (res == 0)
1467                         goto wake_up;
1468                 WARN_ON(res > 1);
1469                 /*
1470                  * res is 1, which means the driver requested
1471                  * to go through a regular reset on wakeup.
1472                  */
1473                 reconfig_due_to_wowlan = true;
1474         }
1475 #endif
1476         /* everything else happens only if HW was up & running */
1477         if (!local->open_count)
1478                 goto wake_up;
1479
1480         /*
1481          * Upon resume hardware can sometimes be goofy due to
1482          * various platform / driver / bus issues, so restarting
1483          * the device may at times not work immediately. Propagate
1484          * the error.
1485          */
1486         res = drv_start(local);
1487         if (res) {
1488                 WARN(local->suspended, "Hardware became unavailable "
1489                      "upon resume. This could be a software issue "
1490                      "prior to suspend or a hardware issue.\n");
1491                 return res;
1492         }
1493
1494         /* setup fragmentation threshold */
1495         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1496
1497         /* setup RTS threshold */
1498         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1499
1500         /* reset coverage class */
1501         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1502
1503         ieee80211_led_radio(local, true);
1504         ieee80211_mod_tpt_led_trig(local,
1505                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1506
1507         /* add interfaces */
1508         sdata = rtnl_dereference(local->monitor_sdata);
1509         if (sdata) {
1510                 /* in HW restart it exists already */
1511                 WARN_ON(local->resuming);
1512                 res = drv_add_interface(local, sdata);
1513                 if (WARN_ON(res)) {
1514                         rcu_assign_pointer(local->monitor_sdata, NULL);
1515                         synchronize_net();
1516                         kfree(sdata);
1517                 }
1518         }
1519
1520         list_for_each_entry(sdata, &local->interfaces, list) {
1521                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1522                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1523                     ieee80211_sdata_running(sdata))
1524                         res = drv_add_interface(local, sdata);
1525         }
1526
1527         /* add channel contexts */
1528         if (local->use_chanctx) {
1529                 mutex_lock(&local->chanctx_mtx);
1530                 list_for_each_entry(ctx, &local->chanctx_list, list)
1531                         WARN_ON(drv_add_chanctx(local, ctx));
1532                 mutex_unlock(&local->chanctx_mtx);
1533         }
1534
1535         list_for_each_entry(sdata, &local->interfaces, list) {
1536                 if (!ieee80211_sdata_running(sdata))
1537                         continue;
1538                 ieee80211_assign_chanctx(local, sdata);
1539         }
1540
1541         sdata = rtnl_dereference(local->monitor_sdata);
1542         if (sdata && ieee80211_sdata_running(sdata))
1543                 ieee80211_assign_chanctx(local, sdata);
1544
1545         /* add STAs back */
1546         mutex_lock(&local->sta_mtx);
1547         list_for_each_entry(sta, &local->sta_list, list) {
1548                 enum ieee80211_sta_state state;
1549
1550                 if (!sta->uploaded)
1551                         continue;
1552
1553                 /* AP-mode stations will be added later */
1554                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1555                         continue;
1556
1557                 for (state = IEEE80211_STA_NOTEXIST;
1558                      state < sta->sta_state; state++)
1559                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1560                                               state + 1));
1561         }
1562         mutex_unlock(&local->sta_mtx);
1563
1564         /* reconfigure tx conf */
1565         if (hw->queues >= IEEE80211_NUM_ACS) {
1566                 list_for_each_entry(sdata, &local->interfaces, list) {
1567                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1568                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1569                             !ieee80211_sdata_running(sdata))
1570                                 continue;
1571
1572                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1573                                 drv_conf_tx(local, sdata, i,
1574                                             &sdata->tx_conf[i]);
1575                 }
1576         }
1577
1578         /* reconfigure hardware */
1579         ieee80211_hw_config(local, ~0);
1580
1581         ieee80211_configure_filter(local);
1582
1583         /* Finally also reconfigure all the BSS information */
1584         list_for_each_entry(sdata, &local->interfaces, list) {
1585                 u32 changed;
1586
1587                 if (!ieee80211_sdata_running(sdata))
1588                         continue;
1589
1590                 /* common change flags for all interface types */
1591                 changed = BSS_CHANGED_ERP_CTS_PROT |
1592                           BSS_CHANGED_ERP_PREAMBLE |
1593                           BSS_CHANGED_ERP_SLOT |
1594                           BSS_CHANGED_HT |
1595                           BSS_CHANGED_BASIC_RATES |
1596                           BSS_CHANGED_BEACON_INT |
1597                           BSS_CHANGED_BSSID |
1598                           BSS_CHANGED_CQM |
1599                           BSS_CHANGED_QOS |
1600                           BSS_CHANGED_IDLE |
1601                           BSS_CHANGED_TXPOWER;
1602
1603                 switch (sdata->vif.type) {
1604                 case NL80211_IFTYPE_STATION:
1605                         changed |= BSS_CHANGED_ASSOC |
1606                                    BSS_CHANGED_ARP_FILTER |
1607                                    BSS_CHANGED_PS;
1608
1609                         /* Re-send beacon info report to the driver */
1610                         if (sdata->u.mgd.have_beacon)
1611                                 changed |= BSS_CHANGED_BEACON_INFO;
1612
1613                         sdata_lock(sdata);
1614                         ieee80211_bss_info_change_notify(sdata, changed);
1615                         sdata_unlock(sdata);
1616                         break;
1617                 case NL80211_IFTYPE_ADHOC:
1618                         changed |= BSS_CHANGED_IBSS;
1619                         /* fall through */
1620                 case NL80211_IFTYPE_AP:
1621                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1622
1623                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1624                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1625
1626                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1627                                         drv_start_ap(local, sdata);
1628                         }
1629
1630                         /* fall through */
1631                 case NL80211_IFTYPE_MESH_POINT:
1632                         if (sdata->vif.bss_conf.enable_beacon) {
1633                                 changed |= BSS_CHANGED_BEACON |
1634                                            BSS_CHANGED_BEACON_ENABLED;
1635                                 ieee80211_bss_info_change_notify(sdata, changed);
1636                         }
1637                         break;
1638                 case NL80211_IFTYPE_WDS:
1639                         break;
1640                 case NL80211_IFTYPE_AP_VLAN:
1641                 case NL80211_IFTYPE_MONITOR:
1642                         /* ignore virtual */
1643                         break;
1644                 case NL80211_IFTYPE_P2P_DEVICE:
1645                         changed = BSS_CHANGED_IDLE;
1646                         break;
1647                 case NL80211_IFTYPE_UNSPECIFIED:
1648                 case NUM_NL80211_IFTYPES:
1649                 case NL80211_IFTYPE_P2P_CLIENT:
1650                 case NL80211_IFTYPE_P2P_GO:
1651                         WARN_ON(1);
1652                         break;
1653                 }
1654         }
1655
1656         ieee80211_recalc_ps(local, -1);
1657
1658         /*
1659          * The sta might be in psm against the ap (e.g. because
1660          * this was the state before a hw restart), so we
1661          * explicitly send a null packet in order to make sure
1662          * it'll sync against the ap (and get out of psm).
1663          */
1664         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1665                 list_for_each_entry(sdata, &local->interfaces, list) {
1666                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1667                                 continue;
1668                         if (!sdata->u.mgd.associated)
1669                                 continue;
1670
1671                         ieee80211_send_nullfunc(local, sdata, 0);
1672                 }
1673         }
1674
1675         /* APs are now beaconing, add back stations */
1676         mutex_lock(&local->sta_mtx);
1677         list_for_each_entry(sta, &local->sta_list, list) {
1678                 enum ieee80211_sta_state state;
1679
1680                 if (!sta->uploaded)
1681                         continue;
1682
1683                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1684                         continue;
1685
1686                 for (state = IEEE80211_STA_NOTEXIST;
1687                      state < sta->sta_state; state++)
1688                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1689                                               state + 1));
1690         }
1691         mutex_unlock(&local->sta_mtx);
1692
1693         /* add back keys */
1694         list_for_each_entry(sdata, &local->interfaces, list)
1695                 if (ieee80211_sdata_running(sdata))
1696                         ieee80211_enable_keys(sdata);
1697
1698  wake_up:
1699         local->in_reconfig = false;
1700         barrier();
1701
1702         if (local->monitors == local->open_count && local->monitors > 0)
1703                 ieee80211_add_virtual_monitor(local);
1704
1705         /*
1706          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1707          * sessions can be established after a resume.
1708          *
1709          * Also tear down aggregation sessions since reconfiguring
1710          * them in a hardware restart scenario is not easily done
1711          * right now, and the hardware will have lost information
1712          * about the sessions, but we and the AP still think they
1713          * are active. This is really a workaround though.
1714          */
1715         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1716                 mutex_lock(&local->sta_mtx);
1717
1718                 list_for_each_entry(sta, &local->sta_list, list) {
1719                         ieee80211_sta_tear_down_BA_sessions(
1720                                         sta, AGG_STOP_LOCAL_REQUEST);
1721                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1722                 }
1723
1724                 mutex_unlock(&local->sta_mtx);
1725         }
1726
1727         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1728                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1729
1730         /*
1731          * If this is for hw restart things are still running.
1732          * We may want to change that later, however.
1733          */
1734         if (!local->suspended || reconfig_due_to_wowlan)
1735                 drv_restart_complete(local);
1736
1737         if (!local->suspended)
1738                 return 0;
1739
1740 #ifdef CONFIG_PM
1741         /* first set suspended false, then resuming */
1742         local->suspended = false;
1743         mb();
1744         local->resuming = false;
1745
1746         list_for_each_entry(sdata, &local->interfaces, list) {
1747                 if (!ieee80211_sdata_running(sdata))
1748                         continue;
1749                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1750                         ieee80211_sta_restart(sdata);
1751         }
1752
1753         mod_timer(&local->sta_cleanup, jiffies + 1);
1754 #else
1755         WARN_ON(1);
1756 #endif
1757         return 0;
1758 }
1759
1760 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1761 {
1762         struct ieee80211_sub_if_data *sdata;
1763         struct ieee80211_local *local;
1764         struct ieee80211_key *key;
1765
1766         if (WARN_ON(!vif))
1767                 return;
1768
1769         sdata = vif_to_sdata(vif);
1770         local = sdata->local;
1771
1772         if (WARN_ON(!local->resuming))
1773                 return;
1774
1775         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1776                 return;
1777
1778         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1779
1780         mutex_lock(&local->key_mtx);
1781         list_for_each_entry(key, &sdata->key_list, list)
1782                 key->flags |= KEY_FLAG_TAINTED;
1783         mutex_unlock(&local->key_mtx);
1784 }
1785 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1786
1787 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1788 {
1789         struct ieee80211_local *local = sdata->local;
1790         struct ieee80211_chanctx_conf *chanctx_conf;
1791         struct ieee80211_chanctx *chanctx;
1792
1793         mutex_lock(&local->chanctx_mtx);
1794
1795         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1796                                         lockdep_is_held(&local->chanctx_mtx));
1797
1798         if (WARN_ON_ONCE(!chanctx_conf))
1799                 goto unlock;
1800
1801         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1802         ieee80211_recalc_smps_chanctx(local, chanctx);
1803  unlock:
1804         mutex_unlock(&local->chanctx_mtx);
1805 }
1806
1807 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1808 {
1809         int i;
1810
1811         for (i = 0; i < n_ids; i++)
1812                 if (ids[i] == id)
1813                         return true;
1814         return false;
1815 }
1816
1817 /**
1818  * ieee80211_ie_split - split an IE buffer according to ordering
1819  *
1820  * @ies: the IE buffer
1821  * @ielen: the length of the IE buffer
1822  * @ids: an array with element IDs that are allowed before
1823  *      the split
1824  * @n_ids: the size of the element ID array
1825  * @offset: offset where to start splitting in the buffer
1826  *
1827  * This function splits an IE buffer by updating the @offset
1828  * variable to point to the location where the buffer should be
1829  * split.
1830  *
1831  * It assumes that the given IE buffer is well-formed, this
1832  * has to be guaranteed by the caller!
1833  *
1834  * It also assumes that the IEs in the buffer are ordered
1835  * correctly, if not the result of using this function will not
1836  * be ordered correctly either, i.e. it does no reordering.
1837  *
1838  * The function returns the offset where the next part of the
1839  * buffer starts, which may be @ielen if the entire (remainder)
1840  * of the buffer should be used.
1841  */
1842 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1843                           const u8 *ids, int n_ids, size_t offset)
1844 {
1845         size_t pos = offset;
1846
1847         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1848                 pos += 2 + ies[pos + 1];
1849
1850         return pos;
1851 }
1852
1853 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1854 {
1855         size_t pos = offset;
1856
1857         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1858                 pos += 2 + ies[pos + 1];
1859
1860         return pos;
1861 }
1862
1863 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1864                                             int rssi_min_thold,
1865                                             int rssi_max_thold)
1866 {
1867         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1868
1869         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1870                 return;
1871
1872         /*
1873          * Scale up threshold values before storing it, as the RSSI averaging
1874          * algorithm uses a scaled up value as well. Change this scaling
1875          * factor if the RSSI averaging algorithm changes.
1876          */
1877         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1878         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1879 }
1880
1881 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1882                                     int rssi_min_thold,
1883                                     int rssi_max_thold)
1884 {
1885         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1886
1887         WARN_ON(rssi_min_thold == rssi_max_thold ||
1888                 rssi_min_thold > rssi_max_thold);
1889
1890         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1891                                        rssi_max_thold);
1892 }
1893 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1894
1895 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1896 {
1897         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1898
1899         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1900 }
1901 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1902
1903 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1904                               u16 cap)
1905 {
1906         __le16 tmp;
1907
1908         *pos++ = WLAN_EID_HT_CAPABILITY;
1909         *pos++ = sizeof(struct ieee80211_ht_cap);
1910         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1911
1912         /* capability flags */
1913         tmp = cpu_to_le16(cap);
1914         memcpy(pos, &tmp, sizeof(u16));
1915         pos += sizeof(u16);
1916
1917         /* AMPDU parameters */
1918         *pos++ = ht_cap->ampdu_factor |
1919                  (ht_cap->ampdu_density <<
1920                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1921
1922         /* MCS set */
1923         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1924         pos += sizeof(ht_cap->mcs);
1925
1926         /* extended capabilities */
1927         pos += sizeof(__le16);
1928
1929         /* BF capabilities */
1930         pos += sizeof(__le32);
1931
1932         /* antenna selection */
1933         pos += sizeof(u8);
1934
1935         return pos;
1936 }
1937
1938 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1939                                u32 cap)
1940 {
1941         __le32 tmp;
1942
1943         *pos++ = WLAN_EID_VHT_CAPABILITY;
1944         *pos++ = sizeof(struct ieee80211_vht_cap);
1945         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1946
1947         /* capability flags */
1948         tmp = cpu_to_le32(cap);
1949         memcpy(pos, &tmp, sizeof(u32));
1950         pos += sizeof(u32);
1951
1952         /* VHT MCS set */
1953         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1954         pos += sizeof(vht_cap->vht_mcs);
1955
1956         return pos;
1957 }
1958
1959 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1960                                const struct cfg80211_chan_def *chandef,
1961                                u16 prot_mode)
1962 {
1963         struct ieee80211_ht_operation *ht_oper;
1964         /* Build HT Information */
1965         *pos++ = WLAN_EID_HT_OPERATION;
1966         *pos++ = sizeof(struct ieee80211_ht_operation);
1967         ht_oper = (struct ieee80211_ht_operation *)pos;
1968         ht_oper->primary_chan = ieee80211_frequency_to_channel(
1969                                         chandef->chan->center_freq);
1970         switch (chandef->width) {
1971         case NL80211_CHAN_WIDTH_160:
1972         case NL80211_CHAN_WIDTH_80P80:
1973         case NL80211_CHAN_WIDTH_80:
1974         case NL80211_CHAN_WIDTH_40:
1975                 if (chandef->center_freq1 > chandef->chan->center_freq)
1976                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1977                 else
1978                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1979                 break;
1980         default:
1981                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1982                 break;
1983         }
1984         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1985             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
1986             chandef->width != NL80211_CHAN_WIDTH_20)
1987                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1988
1989         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1990         ht_oper->stbc_param = 0x0000;
1991
1992         /* It seems that Basic MCS set and Supported MCS set
1993            are identical for the first 10 bytes */
1994         memset(&ht_oper->basic_set, 0, 16);
1995         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1996
1997         return pos + sizeof(struct ieee80211_ht_operation);
1998 }
1999
2000 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
2001                                   const struct ieee80211_ht_operation *ht_oper,
2002                                   struct cfg80211_chan_def *chandef)
2003 {
2004         enum nl80211_channel_type channel_type;
2005
2006         if (!ht_oper) {
2007                 cfg80211_chandef_create(chandef, control_chan,
2008                                         NL80211_CHAN_NO_HT);
2009                 return;
2010         }
2011
2012         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2013         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2014                 channel_type = NL80211_CHAN_HT20;
2015                 break;
2016         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2017                 channel_type = NL80211_CHAN_HT40PLUS;
2018                 break;
2019         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2020                 channel_type = NL80211_CHAN_HT40MINUS;
2021                 break;
2022         default:
2023                 channel_type = NL80211_CHAN_NO_HT;
2024         }
2025
2026         cfg80211_chandef_create(chandef, control_chan, channel_type);
2027 }
2028
2029 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2030                              const struct ieee80211_supported_band *sband,
2031                              const u8 *srates, int srates_len, u32 *rates)
2032 {
2033         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2034         int shift = ieee80211_chandef_get_shift(chandef);
2035         struct ieee80211_rate *br;
2036         int brate, rate, i, j, count = 0;
2037
2038         *rates = 0;
2039
2040         for (i = 0; i < srates_len; i++) {
2041                 rate = srates[i] & 0x7f;
2042
2043                 for (j = 0; j < sband->n_bitrates; j++) {
2044                         br = &sband->bitrates[j];
2045                         if ((rate_flags & br->flags) != rate_flags)
2046                                 continue;
2047
2048                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2049                         if (brate == rate) {
2050                                 *rates |= BIT(j);
2051                                 count++;
2052                                 break;
2053                         }
2054                 }
2055         }
2056         return count;
2057 }
2058
2059 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2060                             struct sk_buff *skb, bool need_basic,
2061                             enum ieee80211_band band)
2062 {
2063         struct ieee80211_local *local = sdata->local;
2064         struct ieee80211_supported_band *sband;
2065         int rate, shift;
2066         u8 i, rates, *pos;
2067         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2068         u32 rate_flags;
2069
2070         shift = ieee80211_vif_get_shift(&sdata->vif);
2071         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2072         sband = local->hw.wiphy->bands[band];
2073         rates = 0;
2074         for (i = 0; i < sband->n_bitrates; i++) {
2075                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2076                         continue;
2077                 rates++;
2078         }
2079         if (rates > 8)
2080                 rates = 8;
2081
2082         if (skb_tailroom(skb) < rates + 2)
2083                 return -ENOMEM;
2084
2085         pos = skb_put(skb, rates + 2);
2086         *pos++ = WLAN_EID_SUPP_RATES;
2087         *pos++ = rates;
2088         for (i = 0; i < rates; i++) {
2089                 u8 basic = 0;
2090                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2091                         continue;
2092
2093                 if (need_basic && basic_rates & BIT(i))
2094                         basic = 0x80;
2095                 rate = sband->bitrates[i].bitrate;
2096                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2097                                     5 * (1 << shift));
2098                 *pos++ = basic | (u8) rate;
2099         }
2100
2101         return 0;
2102 }
2103
2104 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2105                                 struct sk_buff *skb, bool need_basic,
2106                                 enum ieee80211_band band)
2107 {
2108         struct ieee80211_local *local = sdata->local;
2109         struct ieee80211_supported_band *sband;
2110         int rate, shift;
2111         u8 i, exrates, *pos;
2112         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2113         u32 rate_flags;
2114
2115         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2116         shift = ieee80211_vif_get_shift(&sdata->vif);
2117
2118         sband = local->hw.wiphy->bands[band];
2119         exrates = 0;
2120         for (i = 0; i < sband->n_bitrates; i++) {
2121                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2122                         continue;
2123                 exrates++;
2124         }
2125
2126         if (exrates > 8)
2127                 exrates -= 8;
2128         else
2129                 exrates = 0;
2130
2131         if (skb_tailroom(skb) < exrates + 2)
2132                 return -ENOMEM;
2133
2134         if (exrates) {
2135                 pos = skb_put(skb, exrates + 2);
2136                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2137                 *pos++ = exrates;
2138                 for (i = 8; i < sband->n_bitrates; i++) {
2139                         u8 basic = 0;
2140                         if ((rate_flags & sband->bitrates[i].flags)
2141                             != rate_flags)
2142                                 continue;
2143                         if (need_basic && basic_rates & BIT(i))
2144                                 basic = 0x80;
2145                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2146                                             5 * (1 << shift));
2147                         *pos++ = basic | (u8) rate;
2148                 }
2149         }
2150         return 0;
2151 }
2152
2153 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2154 {
2155         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2156         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2157
2158         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2159                 /* non-managed type inferfaces */
2160                 return 0;
2161         }
2162         return ifmgd->ave_beacon_signal / 16;
2163 }
2164 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2165
2166 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2167 {
2168         if (!mcs)
2169                 return 1;
2170
2171         /* TODO: consider rx_highest */
2172
2173         if (mcs->rx_mask[3])
2174                 return 4;
2175         if (mcs->rx_mask[2])
2176                 return 3;
2177         if (mcs->rx_mask[1])
2178                 return 2;
2179         return 1;
2180 }
2181
2182 /**
2183  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2184  * @local: mac80211 hw info struct
2185  * @status: RX status
2186  * @mpdu_len: total MPDU length (including FCS)
2187  * @mpdu_offset: offset into MPDU to calculate timestamp at
2188  *
2189  * This function calculates the RX timestamp at the given MPDU offset, taking
2190  * into account what the RX timestamp was. An offset of 0 will just normalize
2191  * the timestamp to TSF at beginning of MPDU reception.
2192  */
2193 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2194                                      struct ieee80211_rx_status *status,
2195                                      unsigned int mpdu_len,
2196                                      unsigned int mpdu_offset)
2197 {
2198         u64 ts = status->mactime;
2199         struct rate_info ri;
2200         u16 rate;
2201
2202         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2203                 return 0;
2204
2205         memset(&ri, 0, sizeof(ri));
2206
2207         /* Fill cfg80211 rate info */
2208         if (status->flag & RX_FLAG_HT) {
2209                 ri.mcs = status->rate_idx;
2210                 ri.flags |= RATE_INFO_FLAGS_MCS;
2211                 if (status->flag & RX_FLAG_40MHZ)
2212                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2213                 if (status->flag & RX_FLAG_SHORT_GI)
2214                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2215         } else if (status->flag & RX_FLAG_VHT) {
2216                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2217                 ri.mcs = status->rate_idx;
2218                 ri.nss = status->vht_nss;
2219                 if (status->flag & RX_FLAG_40MHZ)
2220                         ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2221                 if (status->flag & RX_FLAG_80MHZ)
2222                         ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2223                 if (status->flag & RX_FLAG_80P80MHZ)
2224                         ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2225                 if (status->flag & RX_FLAG_160MHZ)
2226                         ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2227                 if (status->flag & RX_FLAG_SHORT_GI)
2228                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2229         } else {
2230                 struct ieee80211_supported_band *sband;
2231                 int shift = 0;
2232                 int bitrate;
2233
2234                 if (status->flag & RX_FLAG_10MHZ)
2235                         shift = 1;
2236                 if (status->flag & RX_FLAG_5MHZ)
2237                         shift = 2;
2238
2239                 sband = local->hw.wiphy->bands[status->band];
2240                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2241                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2242         }
2243
2244         rate = cfg80211_calculate_bitrate(&ri);
2245         if (WARN_ONCE(!rate,
2246                       "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2247                       status->flag, status->rate_idx, status->vht_nss))
2248                 return 0;
2249
2250         /* rewind from end of MPDU */
2251         if (status->flag & RX_FLAG_MACTIME_END)
2252                 ts -= mpdu_len * 8 * 10 / rate;
2253
2254         ts += mpdu_offset * 8 * 10 / rate;
2255
2256         return ts;
2257 }
2258
2259 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2260 {
2261         struct ieee80211_sub_if_data *sdata;
2262
2263         mutex_lock(&local->iflist_mtx);
2264         list_for_each_entry(sdata, &local->interfaces, list) {
2265                 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
2266
2267                 if (sdata->wdev.cac_started) {
2268                         ieee80211_vif_release_channel(sdata);
2269                         cfg80211_cac_event(sdata->dev,
2270                                            NL80211_RADAR_CAC_ABORTED,
2271                                            GFP_KERNEL);
2272                 }
2273         }
2274         mutex_unlock(&local->iflist_mtx);
2275 }
2276
2277 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2278 {
2279         struct ieee80211_local *local =
2280                 container_of(work, struct ieee80211_local, radar_detected_work);
2281         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2282
2283         ieee80211_dfs_cac_cancel(local);
2284
2285         if (local->use_chanctx)
2286                 /* currently not handled */
2287                 WARN_ON(1);
2288         else
2289                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2290 }
2291
2292 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2293 {
2294         struct ieee80211_local *local = hw_to_local(hw);
2295
2296         trace_api_radar_detected(local);
2297
2298         ieee80211_queue_work(hw, &local->radar_detected_work);
2299 }
2300 EXPORT_SYMBOL(ieee80211_radar_detected);
2301
2302 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2303 {
2304         u32 ret;
2305         int tmp;
2306
2307         switch (c->width) {
2308         case NL80211_CHAN_WIDTH_20:
2309                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2310                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2311                 break;
2312         case NL80211_CHAN_WIDTH_40:
2313                 c->width = NL80211_CHAN_WIDTH_20;
2314                 c->center_freq1 = c->chan->center_freq;
2315                 ret = IEEE80211_STA_DISABLE_40MHZ |
2316                       IEEE80211_STA_DISABLE_VHT;
2317                 break;
2318         case NL80211_CHAN_WIDTH_80:
2319                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2320                 /* n_P40 */
2321                 tmp /= 2;
2322                 /* freq_P40 */
2323                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2324                 c->width = NL80211_CHAN_WIDTH_40;
2325                 ret = IEEE80211_STA_DISABLE_VHT;
2326                 break;
2327         case NL80211_CHAN_WIDTH_80P80:
2328                 c->center_freq2 = 0;
2329                 c->width = NL80211_CHAN_WIDTH_80;
2330                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2331                       IEEE80211_STA_DISABLE_160MHZ;
2332                 break;
2333         case NL80211_CHAN_WIDTH_160:
2334                 /* n_P20 */
2335                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2336                 /* n_P80 */
2337                 tmp /= 4;
2338                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2339                 c->width = NL80211_CHAN_WIDTH_80;
2340                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2341                       IEEE80211_STA_DISABLE_160MHZ;
2342                 break;
2343         default:
2344         case NL80211_CHAN_WIDTH_20_NOHT:
2345                 WARN_ON_ONCE(1);
2346                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2347                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2348                 break;
2349         case NL80211_CHAN_WIDTH_5:
2350         case NL80211_CHAN_WIDTH_10:
2351                 WARN_ON_ONCE(1);
2352                 /* keep c->width */
2353                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2354                 break;
2355         }
2356
2357         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2358
2359         return ret;
2360 }
2361
2362 /*
2363  * Returns true if smps_mode_new is strictly more restrictive than
2364  * smps_mode_old.
2365  */
2366 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2367                                    enum ieee80211_smps_mode smps_mode_new)
2368 {
2369         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2370                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2371                 return false;
2372
2373         switch (smps_mode_old) {
2374         case IEEE80211_SMPS_STATIC:
2375                 return false;
2376         case IEEE80211_SMPS_DYNAMIC:
2377                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2378         case IEEE80211_SMPS_OFF:
2379                 return smps_mode_new != IEEE80211_SMPS_OFF;
2380         default:
2381                 WARN_ON(1);
2382         }
2383
2384         return false;
2385 }
2386
2387 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2388                               struct cfg80211_csa_settings *csa_settings)
2389 {
2390         struct sk_buff *skb;
2391         struct ieee80211_mgmt *mgmt;
2392         struct ieee80211_local *local = sdata->local;
2393         int freq;
2394         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2395                                sizeof(mgmt->u.action.u.chan_switch);
2396         u8 *pos;
2397
2398         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2399             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2400                 return -EOPNOTSUPP;
2401
2402         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2403                             5 + /* channel switch announcement element */
2404                             3 + /* secondary channel offset element */
2405                             8); /* mesh channel switch parameters element */
2406         if (!skb)
2407                 return -ENOMEM;
2408
2409         skb_reserve(skb, local->tx_headroom);
2410         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2411         memset(mgmt, 0, hdr_len);
2412         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2413                                           IEEE80211_STYPE_ACTION);
2414
2415         eth_broadcast_addr(mgmt->da);
2416         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2417         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2418                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2419         } else {
2420                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2421                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2422         }
2423         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2424         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2425         pos = skb_put(skb, 5);
2426         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
2427         *pos++ = 3;                                             /* IE length */
2428         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
2429         freq = csa_settings->chandef.chan->center_freq;
2430         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
2431         *pos++ = csa_settings->count;                           /* count */
2432
2433         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2434                 enum nl80211_channel_type ch_type;
2435
2436                 skb_put(skb, 3);
2437                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
2438                 *pos++ = 1;                                     /* IE length */
2439                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2440                 if (ch_type == NL80211_CHAN_HT40PLUS)
2441                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2442                 else
2443                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2444         }
2445
2446         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2447                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2448                 __le16 pre_value;
2449
2450                 skb_put(skb, 8);
2451                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
2452                 *pos++ = 6;                                     /* IE length */
2453                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
2454                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
2455                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2456                 *pos++ |= csa_settings->block_tx ?
2457                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2458                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2459                 pos += 2;
2460                 pre_value = cpu_to_le16(ifmsh->pre_value);
2461                 memcpy(pos, &pre_value, 2);             /* Precedence Value */
2462                 pos += 2;
2463         }
2464
2465         ieee80211_tx_skb(sdata, skb);
2466         return 0;
2467 }