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