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(struct ieee80211_local *local, size_t len,
 110                              int rate, int erp, int short_preamble)
 111 {
 112         int dur;
 113
 114         /* calculate duration (in microseconds, rounded up to next higher
 115          * integer if it includes a fractional microsecond) to send frame of
 116          * len bytes (does not include FCS) at the given rate. Duration will
 117          * also include SIFS.
 118          *
 119          * rate is in 100 kbps, so divident is multiplied by 10 in the
 120          * DIV_ROUND_UP() operations.
 121          */
 122
 123         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 124                 /*
 125                  * OFDM:
 126                  *
 127                  * N_DBPS = DATARATE x 4
 128                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 129                  *      (16 = SIGNAL time, 6 = tail bits)
 130                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 131                  *
 132                  * T_SYM = 4 usec
 133                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 134                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 135                  *      signal ext = 6 usec
 136                  */
 137                 dur = 16; /* SIFS + signal ext */
 138                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 139                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 140                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 141                                         4 * rate); /* T_SYM x N_SYM */
 142         } else {
 143                 /*
 144                  * 802.11b or 802.11g with 802.11b compatibility:
 145                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 146                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 147                  *
 148                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 149                  * aSIFSTime = 10 usec
 150                  * aPreambleLength = 144 usec or 72 usec with short preamble
 151                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 152                  */
 153                 dur = 10; /* aSIFSTime = 10 usec */
 154                 dur += short_preamble ? (72 + 24) : (144 + 48);
 155
 156                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 157         }
 158
 159         return dur;
 160 }
 161
 162 /* Exported duration function for driver use */
 163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 164                                         struct ieee80211_vif *vif,
 165                                         size_t frame_len,
 166                                         struct ieee80211_rate *rate)
 167 {
 168         struct ieee80211_local *local = hw_to_local(hw);
 169         struct ieee80211_sub_if_data *sdata;
 170         u16 dur;
 171         int erp;
 172         bool short_preamble = false;
 173
 174         erp = 0;
 175         if (vif) {
 176                 sdata = vif_to_sdata(vif);
 177                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 178                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 179                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 180         }
 181
 182         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 183                                        short_preamble);
 184
 185         return cpu_to_le16(dur);
 186 }
 187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 188
 189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 190                               struct ieee80211_vif *vif, size_t frame_len,
 191                               const struct ieee80211_tx_info *frame_txctl)
 192 {
 193         struct ieee80211_local *local = hw_to_local(hw);
 194         struct ieee80211_rate *rate;
 195         struct ieee80211_sub_if_data *sdata;
 196         bool short_preamble;
 197         int erp;
 198         u16 dur;
 199         struct ieee80211_supported_band *sband;
 200
 201         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 202
 203         short_preamble = false;
 204
 205         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 206
 207         erp = 0;
 208         if (vif) {
 209                 sdata = vif_to_sdata(vif);
 210                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 211                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 212                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 213         }
 214
 215         /* CTS duration */
 216         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 217                                        erp, short_preamble);
 218         /* Data frame duration */
 219         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 220                                         erp, short_preamble);
 221         /* ACK duration */
 222         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 223                                         erp, short_preamble);
 224
 225         return cpu_to_le16(dur);
 226 }
 227 EXPORT_SYMBOL(ieee80211_rts_duration);
 228
 229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 230                                     struct ieee80211_vif *vif,
 231                                     size_t frame_len,
 232                                     const struct ieee80211_tx_info *frame_txctl)
 233 {
 234         struct ieee80211_local *local = hw_to_local(hw);
 235         struct ieee80211_rate *rate;
 236         struct ieee80211_sub_if_data *sdata;
 237         bool short_preamble;
 238         int erp;
 239         u16 dur;
 240         struct ieee80211_supported_band *sband;
 241
 242         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 243
 244         short_preamble = false;
 245
 246         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 247         erp = 0;
 248         if (vif) {
 249                 sdata = vif_to_sdata(vif);
 250                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 251                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 252                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 253         }
 254
 255         /* Data frame duration */
 256         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 257                                        erp, short_preamble);
 258         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 259                 /* ACK duration */
 260                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 261                                                 erp, short_preamble);
 262         }
 263
 264         return cpu_to_le16(dur);
 265 }
 266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 269                                    enum queue_stop_reason reason)
 270 {
 271         struct ieee80211_local *local = hw_to_local(hw);
 272         struct ieee80211_sub_if_data *sdata;
 273
 274         trace_wake_queue(local, queue, reason);
 275
 276         if (WARN_ON(queue >= hw->queues))
 277                 return;
 278
 279         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 280
 281         if (local->queue_stop_reasons[queue] != 0)
 282                 /* someone still has this queue stopped */
 283                 return;
 284
 285         if (skb_queue_empty(&local->pending[queue])) {
 286                 rcu_read_lock();
 287                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 288                         if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 289                                 continue;
 290                         netif_wake_subqueue(sdata->dev, queue);
 291                 }
 292                 rcu_read_unlock();
 293         } else
 294                 tasklet_schedule(&local->tx_pending_tasklet);
 295 }
 296
 297 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 298                                     enum queue_stop_reason reason)
 299 {
 300         struct ieee80211_local *local = hw_to_local(hw);
 301         unsigned long flags;
 302
 303         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 304         __ieee80211_wake_queue(hw, queue, reason);
 305         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 306 }
 307
 308 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 309 {
 310         ieee80211_wake_queue_by_reason(hw, queue,
 311                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 312 }
 313 EXPORT_SYMBOL(ieee80211_wake_queue);
 314
 315 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 316                                    enum queue_stop_reason reason)
 317 {
 318         struct ieee80211_local *local = hw_to_local(hw);
 319         struct ieee80211_sub_if_data *sdata;
 320
 321         trace_stop_queue(local, queue, reason);
 322
 323         if (WARN_ON(queue >= hw->queues))
 324                 return;
 325
 326         __set_bit(reason, &local->queue_stop_reasons[queue]);
 327
 328         rcu_read_lock();
 329         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 330                 netif_stop_subqueue(sdata->dev, queue);
 331         rcu_read_unlock();
 332 }
 333
 334 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 335                                     enum queue_stop_reason reason)
 336 {
 337         struct ieee80211_local *local = hw_to_local(hw);
 338         unsigned long flags;
 339
 340         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 341         __ieee80211_stop_queue(hw, queue, reason);
 342         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 343 }
 344
 345 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 346 {
 347         ieee80211_stop_queue_by_reason(hw, queue,
 348                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 349 }
 350 EXPORT_SYMBOL(ieee80211_stop_queue);
 351
 352 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 353                                struct sk_buff *skb)
 354 {
 355         struct ieee80211_hw *hw = &local->hw;
 356         unsigned long flags;
 357         int queue = skb_get_queue_mapping(skb);
 358         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 359
 360         if (WARN_ON(!info->control.vif)) {
 361                 kfree_skb(skb);
 362                 return;
 363         }
 364
 365         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 366         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 367         __skb_queue_tail(&local->pending[queue], skb);
 368         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 369         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 370 }
 371
 372 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 373                                    struct sk_buff_head *skbs,
 374                                    void (*fn)(void *data), void *data)
 375 {
 376         struct ieee80211_hw *hw = &local->hw;
 377         struct sk_buff *skb;
 378         unsigned long flags;
 379         int queue, i;
 380
 381         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 382         for (i = 0; i < hw->queues; i++)
 383                 __ieee80211_stop_queue(hw, i,
 384                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 385
 386         while ((skb = skb_dequeue(skbs))) {
 387                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 388
 389                 if (WARN_ON(!info->control.vif)) {
 390                         kfree_skb(skb);
 391                         continue;
 392                 }
 393
 394                 queue = skb_get_queue_mapping(skb);
 395                 __skb_queue_tail(&local->pending[queue], skb);
 396         }
 397
 398         if (fn)
 399                 fn(data);
 400
 401         for (i = 0; i < hw->queues; i++)
 402                 __ieee80211_wake_queue(hw, i,
 403                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 404         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 405 }
 406
 407 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 408                                 struct sk_buff_head *skbs)
 409 {
 410         ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
 411 }
 412
 413 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 414                                     enum queue_stop_reason reason)
 415 {
 416         struct ieee80211_local *local = hw_to_local(hw);
 417         unsigned long flags;
 418         int i;
 419
 420         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 421
 422         for (i = 0; i < hw->queues; i++)
 423                 __ieee80211_stop_queue(hw, i, reason);
 424
 425         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 426 }
 427
 428 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 429 {
 430         ieee80211_stop_queues_by_reason(hw,
 431                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 432 }
 433 EXPORT_SYMBOL(ieee80211_stop_queues);
 434
 435 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 436 {
 437         struct ieee80211_local *local = hw_to_local(hw);
 438         unsigned long flags;
 439         int ret;
 440
 441         if (WARN_ON(queue >= hw->queues))
 442                 return true;
 443
 444         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 445         ret = !!local->queue_stop_reasons[queue];
 446         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 447         return ret;
 448 }
 449 EXPORT_SYMBOL(ieee80211_queue_stopped);
 450
 451 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 452                                      enum queue_stop_reason reason)
 453 {
 454         struct ieee80211_local *local = hw_to_local(hw);
 455         unsigned long flags;
 456         int i;
 457
 458         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 459
 460         for (i = 0; i < hw->queues; i++)
 461                 __ieee80211_wake_queue(hw, i, reason);
 462
 463         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 464 }
 465
 466 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 467 {
 468         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 469 }
 470 EXPORT_SYMBOL(ieee80211_wake_queues);
 471
 472 void ieee80211_iterate_active_interfaces(
 473         struct ieee80211_hw *hw,
 474         void (*iterator)(void *data, u8 *mac,
 475                          struct ieee80211_vif *vif),
 476         void *data)
 477 {
 478         struct ieee80211_local *local = hw_to_local(hw);
 479         struct ieee80211_sub_if_data *sdata;
 480
 481         mutex_lock(&local->iflist_mtx);
 482
 483         list_for_each_entry(sdata, &local->interfaces, list) {
 484                 switch (sdata->vif.type) {
 485                 case NL80211_IFTYPE_MONITOR:
 486                 case NL80211_IFTYPE_AP_VLAN:
 487                         continue;
 488                 default:
 489                         break;
 490                 }
 491                 if (ieee80211_sdata_running(sdata))
 492                         iterator(data, sdata->vif.addr,
 493                                  &sdata->vif);
 494         }
 495
 496         mutex_unlock(&local->iflist_mtx);
 497 }
 498 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 499
 500 void ieee80211_iterate_active_interfaces_atomic(
 501         struct ieee80211_hw *hw,
 502         void (*iterator)(void *data, u8 *mac,
 503                          struct ieee80211_vif *vif),
 504         void *data)
 505 {
 506         struct ieee80211_local *local = hw_to_local(hw);
 507         struct ieee80211_sub_if_data *sdata;
 508
 509         rcu_read_lock();
 510
 511         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 512                 switch (sdata->vif.type) {
 513                 case NL80211_IFTYPE_MONITOR:
 514                 case NL80211_IFTYPE_AP_VLAN:
 515                         continue;
 516                 default:
 517                         break;
 518                 }
 519                 if (ieee80211_sdata_running(sdata))
 520                         iterator(data, sdata->vif.addr,
 521                                  &sdata->vif);
 522         }
 523
 524         rcu_read_unlock();
 525 }
 526 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 527
 528 /*
 529  * Nothing should have been stuffed into the workqueue during
 530  * the suspend->resume cycle. If this WARN is seen then there
 531  * is a bug with either the driver suspend or something in
 532  * mac80211 stuffing into the workqueue which we haven't yet
 533  * cleared during mac80211's suspend cycle.
 534  */
 535 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 536 {
 537         if (WARN(local->suspended && !local->resuming,
 538                  "queueing ieee80211 work while going to suspend\n"))
 539                 return false;
 540
 541         return true;
 542 }
 543
 544 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 545 {
 546         struct ieee80211_local *local = hw_to_local(hw);
 547
 548         if (!ieee80211_can_queue_work(local))
 549                 return;
 550
 551         queue_work(local->workqueue, work);
 552 }
 553 EXPORT_SYMBOL(ieee80211_queue_work);
 554
 555 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 556                                   struct delayed_work *dwork,
 557                                   unsigned long delay)
 558 {
 559         struct ieee80211_local *local = hw_to_local(hw);
 560
 561         if (!ieee80211_can_queue_work(local))
 562                 return;
 563
 564         queue_delayed_work(local->workqueue, dwork, delay);
 565 }
 566 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 567
 568 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 569                                struct ieee802_11_elems *elems,
 570                                u64 filter, u32 crc)
 571 {
 572         size_t left = len;
 573         u8 *pos = start;
 574         bool calc_crc = filter != 0;
 575         DECLARE_BITMAP(seen_elems, 256);
 576
 577         bitmap_zero(seen_elems, 256);
 578         memset(elems, 0, sizeof(*elems));
 579         elems->ie_start = start;
 580         elems->total_len = len;
 581
 582         while (left >= 2) {
 583                 u8 id, elen;
 584                 bool elem_parse_failed;
 585
 586                 id = *pos++;
 587                 elen = *pos++;
 588                 left -= 2;
 589
 590                 if (elen > left) {
 591                         elems->parse_error = true;
 592                         break;
 593                 }
 594
 595                 if (id != WLAN_EID_VENDOR_SPECIFIC &&
 596                     id != WLAN_EID_QUIET &&
 597                     test_bit(id, seen_elems)) {
 598                         elems->parse_error = true;
 599                         left -= elen;
 600                         pos += elen;
 601                         continue;
 602                 }
 603
 604                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 605                         crc = crc32_be(crc, pos - 2, elen + 2);
 606
 607                 elem_parse_failed = false;
 608
 609                 switch (id) {
 610                 case WLAN_EID_SSID:
 611                         elems->ssid = pos;
 612                         elems->ssid_len = elen;
 613                         break;
 614                 case WLAN_EID_SUPP_RATES:
 615                         elems->supp_rates = pos;
 616                         elems->supp_rates_len = elen;
 617                         break;
 618                 case WLAN_EID_FH_PARAMS:
 619                         elems->fh_params = pos;
 620                         elems->fh_params_len = elen;
 621                         break;
 622                 case WLAN_EID_DS_PARAMS:
 623                         elems->ds_params = pos;
 624                         elems->ds_params_len = elen;
 625                         break;
 626                 case WLAN_EID_CF_PARAMS:
 627                         elems->cf_params = pos;
 628                         elems->cf_params_len = elen;
 629                         break;
 630                 case WLAN_EID_TIM:
 631                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 632                                 elems->tim = (void *)pos;
 633                                 elems->tim_len = elen;
 634                         } else
 635                                 elem_parse_failed = true;
 636                         break;
 637                 case WLAN_EID_IBSS_PARAMS:
 638                         elems->ibss_params = pos;
 639                         elems->ibss_params_len = elen;
 640                         break;
 641                 case WLAN_EID_CHALLENGE:
 642                         elems->challenge = pos;
 643                         elems->challenge_len = elen;
 644                         break;
 645                 case WLAN_EID_VENDOR_SPECIFIC:
 646                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 647                             pos[2] == 0xf2) {
 648                                 /* Microsoft OUI (00:50:F2) */
 649
 650                                 if (calc_crc)
 651                                         crc = crc32_be(crc, pos - 2, elen + 2);
 652
 653                                 if (pos[3] == 1) {
 654                                         /* OUI Type 1 - WPA IE */
 655                                         elems->wpa = pos;
 656                                         elems->wpa_len = elen;
 657                                 } else if (elen >= 5 && pos[3] == 2) {
 658                                         /* OUI Type 2 - WMM IE */
 659                                         if (pos[4] == 0) {
 660                                                 elems->wmm_info = pos;
 661                                                 elems->wmm_info_len = elen;
 662                                         } else if (pos[4] == 1) {
 663                                                 elems->wmm_param = pos;
 664                                                 elems->wmm_param_len = elen;
 665                                         }
 666                                 }
 667                         }
 668                         break;
 669                 case WLAN_EID_RSN:
 670                         elems->rsn = pos;
 671                         elems->rsn_len = elen;
 672                         break;
 673                 case WLAN_EID_ERP_INFO:
 674                         elems->erp_info = pos;
 675                         elems->erp_info_len = elen;
 676                         break;
 677                 case WLAN_EID_EXT_SUPP_RATES:
 678                         elems->ext_supp_rates = pos;
 679                         elems->ext_supp_rates_len = elen;
 680                         break;
 681                 case WLAN_EID_HT_CAPABILITY:
 682                         if (elen >= sizeof(struct ieee80211_ht_cap))
 683                                 elems->ht_cap_elem = (void *)pos;
 684                         else
 685                                 elem_parse_failed = true;
 686                         break;
 687                 case WLAN_EID_HT_INFORMATION:
 688                         if (elen >= sizeof(struct ieee80211_ht_info))
 689                                 elems->ht_info_elem = (void *)pos;
 690                         else
 691                                 elem_parse_failed = true;
 692                         break;
 693                 case WLAN_EID_MESH_ID:
 694                         elems->mesh_id = pos;
 695                         elems->mesh_id_len = elen;
 696                         break;
 697                 case WLAN_EID_MESH_CONFIG:
 698                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 699                                 elems->mesh_config = (void *)pos;
 700                         else
 701                                 elem_parse_failed = true;
 702                         break;
 703                 case WLAN_EID_PEER_MGMT:
 704                         elems->peering = pos;
 705                         elems->peering_len = elen;
 706                         break;
 707                 case WLAN_EID_PREQ:
 708                         elems->preq = pos;
 709                         elems->preq_len = elen;
 710                         break;
 711                 case WLAN_EID_PREP:
 712                         elems->prep = pos;
 713                         elems->prep_len = elen;
 714                         break;
 715                 case WLAN_EID_PERR:
 716                         elems->perr = pos;
 717                         elems->perr_len = elen;
 718                         break;
 719                 case WLAN_EID_RANN:
 720                         if (elen >= sizeof(struct ieee80211_rann_ie))
 721                                 elems->rann = (void *)pos;
 722                         else
 723                                 elem_parse_failed = true;
 724                         break;
 725                 case WLAN_EID_CHANNEL_SWITCH:
 726                         elems->ch_switch_elem = pos;
 727                         elems->ch_switch_elem_len = elen;
 728                         break;
 729                 case WLAN_EID_QUIET:
 730                         if (!elems->quiet_elem) {
 731                                 elems->quiet_elem = pos;
 732                                 elems->quiet_elem_len = elen;
 733                         }
 734                         elems->num_of_quiet_elem++;
 735                         break;
 736                 case WLAN_EID_COUNTRY:
 737                         elems->country_elem = pos;
 738                         elems->country_elem_len = elen;
 739                         break;
 740                 case WLAN_EID_PWR_CONSTRAINT:
 741                         elems->pwr_constr_elem = pos;
 742                         elems->pwr_constr_elem_len = elen;
 743                         break;
 744                 case WLAN_EID_TIMEOUT_INTERVAL:
 745                         elems->timeout_int = pos;
 746                         elems->timeout_int_len = elen;
 747                         break;
 748                 default:
 749                         break;
 750                 }
 751
 752                 if (elem_parse_failed)
 753                         elems->parse_error = true;
 754                 else
 755                         set_bit(id, seen_elems);
 756
 757                 left -= elen;
 758                 pos += elen;
 759         }
 760
 761         if (left != 0)
 762                 elems->parse_error = true;
 763
 764         return crc;
 765 }
 766
 767 void ieee802_11_parse_elems(u8 *start, size_t len,
 768                             struct ieee802_11_elems *elems)
 769 {
 770         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 771 }
 772
 773 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 774                                bool bss_notify)
 775 {
 776         struct ieee80211_local *local = sdata->local;
 777         struct ieee80211_tx_queue_params qparam;
 778         int queue;
 779         bool use_11b;
 780         int aCWmin, aCWmax;
 781
 782         if (!local->ops->conf_tx)
 783                 return;
 784
 785         memset(&qparam, 0, sizeof(qparam));
 786
 787         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 788                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 789
 790         for (queue = 0; queue < local->hw.queues; queue++) {
 791                 /* Set defaults according to 802.11-2007 Table 7-37 */
 792                 aCWmax = 1023;
 793                 if (use_11b)
 794                         aCWmin = 31;
 795                 else
 796                         aCWmin = 15;
 797
 798                 switch (queue) {
 799                 case 3: /* AC_BK */
 800                         qparam.cw_max = aCWmax;
 801                         qparam.cw_min = aCWmin;
 802                         qparam.txop = 0;
 803                         qparam.aifs = 7;
 804                         break;
 805                 default: /* never happens but let's not leave undefined */
 806                 case 2: /* AC_BE */
 807                         qparam.cw_max = aCWmax;
 808                         qparam.cw_min = aCWmin;
 809                         qparam.txop = 0;
 810                         qparam.aifs = 3;
 811                         break;
 812                 case 1: /* AC_VI */
 813                         qparam.cw_max = aCWmin;
 814                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 815                         if (use_11b)
 816                                 qparam.txop = 6016/32;
 817                         else
 818                                 qparam.txop = 3008/32;
 819                         qparam.aifs = 2;
 820                         break;
 821                 case 0: /* AC_VO */
 822                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 823                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 824                         if (use_11b)
 825                                 qparam.txop = 3264/32;
 826                         else
 827                                 qparam.txop = 1504/32;
 828                         qparam.aifs = 2;
 829                         break;
 830                 }
 831
 832                 qparam.uapsd = false;
 833
 834                 sdata->tx_conf[queue] = qparam;
 835                 drv_conf_tx(local, sdata, queue, &qparam);
 836         }
 837
 838         /* after reinitialize QoS TX queues setting to default,
 839          * disable QoS at all */
 840
 841         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 842                 sdata->vif.bss_conf.qos =
 843                         sdata->vif.type != NL80211_IFTYPE_STATION;
 844                 if (bss_notify)
 845                         ieee80211_bss_info_change_notify(sdata,
 846                                                          BSS_CHANGED_QOS);
 847         }
 848 }
 849
 850 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 851                                   const size_t supp_rates_len,
 852                                   const u8 *supp_rates)
 853 {
 854         struct ieee80211_local *local = sdata->local;
 855         int i, have_higher_than_11mbit = 0;
 856
 857         /* cf. IEEE 802.11 9.2.12 */
 858         for (i = 0; i < supp_rates_len; i++)
 859                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 860                         have_higher_than_11mbit = 1;
 861
 862         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 863             have_higher_than_11mbit)
 864                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 865         else
 866                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 867
 868         ieee80211_set_wmm_default(sdata, true);
 869 }
 870
 871 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 872                               enum ieee80211_band band)
 873 {
 874         struct ieee80211_supported_band *sband;
 875         struct ieee80211_rate *bitrates;
 876         u32 mandatory_rates;
 877         enum ieee80211_rate_flags mandatory_flag;
 878         int i;
 879
 880         sband = local->hw.wiphy->bands[band];
 881         if (!sband) {
 882                 WARN_ON(1);
 883                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 884         }
 885
 886         if (band == IEEE80211_BAND_2GHZ)
 887                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 888         else
 889                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 890
 891         bitrates = sband->bitrates;
 892         mandatory_rates = 0;
 893         for (i = 0; i < sband->n_bitrates; i++)
 894                 if (bitrates[i].flags & mandatory_flag)
 895                         mandatory_rates |= BIT(i);
 896         return mandatory_rates;
 897 }
 898
 899 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 900                          u16 transaction, u16 auth_alg,
 901                          u8 *extra, size_t extra_len, const u8 *da,
 902                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 903 {
 904         struct ieee80211_local *local = sdata->local;
 905         struct sk_buff *skb;
 906         struct ieee80211_mgmt *mgmt;
 907         int err;
 908
 909         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 910                             sizeof(*mgmt) + 6 + extra_len);
 911         if (!skb)
 912                 return;
 913
 914         skb_reserve(skb, local->hw.extra_tx_headroom);
 915
 916         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 917         memset(mgmt, 0, 24 + 6);
 918         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 919                                           IEEE80211_STYPE_AUTH);
 920         memcpy(mgmt->da, da, ETH_ALEN);
 921         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 922         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 923         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 924         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 925         mgmt->u.auth.status_code = cpu_to_le16(0);
 926         if (extra)
 927                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 928
 929         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 930                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 931                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 932                 WARN_ON(err);
 933         }
 934
 935         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 936         ieee80211_tx_skb(sdata, skb);
 937 }
 938
 939 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 940                              const u8 *ie, size_t ie_len,
 941                              enum ieee80211_band band, u32 rate_mask,
 942                              u8 channel)
 943 {
 944         struct ieee80211_supported_band *sband;
 945         u8 *pos;
 946         size_t offset = 0, noffset;
 947         int supp_rates_len, i;
 948         u8 rates[32];
 949         int num_rates;
 950         int ext_rates_len;
 951
 952         sband = local->hw.wiphy->bands[band];
 953
 954         pos = buffer;
 955
 956         num_rates = 0;
 957         for (i = 0; i < sband->n_bitrates; i++) {
 958                 if ((BIT(i) & rate_mask) == 0)
 959                         continue; /* skip rate */
 960                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
 961         }
 962
 963         supp_rates_len = min_t(int, num_rates, 8);
 964
 965         *pos++ = WLAN_EID_SUPP_RATES;
 966         *pos++ = supp_rates_len;
 967         memcpy(pos, rates, supp_rates_len);
 968         pos += supp_rates_len;
 969
 970         /* insert "request information" if in custom IEs */
 971         if (ie && ie_len) {
 972                 static const u8 before_extrates[] = {
 973                         WLAN_EID_SSID,
 974                         WLAN_EID_SUPP_RATES,
 975                         WLAN_EID_REQUEST,
 976                 };
 977                 noffset = ieee80211_ie_split(ie, ie_len,
 978                                              before_extrates,
 979                                              ARRAY_SIZE(before_extrates),
 980                                              offset);
 981                 memcpy(pos, ie + offset, noffset - offset);
 982                 pos += noffset - offset;
 983                 offset = noffset;
 984         }
 985
 986         ext_rates_len = num_rates - supp_rates_len;
 987         if (ext_rates_len > 0) {
 988                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 989                 *pos++ = ext_rates_len;
 990                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
 991                 pos += ext_rates_len;
 992         }
 993
 994         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
 995                 *pos++ = WLAN_EID_DS_PARAMS;
 996                 *pos++ = 1;
 997                 *pos++ = channel;
 998         }
 999
1000         /* insert custom IEs that go before HT */
1001         if (ie && ie_len) {
1002                 static const u8 before_ht[] = {
1003                         WLAN_EID_SSID,
1004                         WLAN_EID_SUPP_RATES,
1005                         WLAN_EID_REQUEST,
1006                         WLAN_EID_EXT_SUPP_RATES,
1007                         WLAN_EID_DS_PARAMS,
1008                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1009                 };
1010                 noffset = ieee80211_ie_split(ie, ie_len,
1011                                              before_ht, ARRAY_SIZE(before_ht),
1012                                              offset);
1013                 memcpy(pos, ie + offset, noffset - offset);
1014                 pos += noffset - offset;
1015                 offset = noffset;
1016         }
1017
1018         if (sband->ht_cap.ht_supported)
1019                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1020                                                 sband->ht_cap.cap);
1021
1022         /*
1023          * If adding more here, adjust code in main.c
1024          * that calculates local->scan_ies_len.
1025          */
1026
1027         /* add any remaining custom IEs */
1028         if (ie && ie_len) {
1029                 noffset = ie_len;
1030                 memcpy(pos, ie + offset, noffset - offset);
1031                 pos += noffset - offset;
1032         }
1033
1034         return pos - buffer;
1035 }
1036
1037 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1038                                           u8 *dst, u32 ratemask,
1039                                           const u8 *ssid, size_t ssid_len,
1040                                           const u8 *ie, size_t ie_len,
1041                                           bool directed)
1042 {
1043         struct ieee80211_local *local = sdata->local;
1044         struct sk_buff *skb;
1045         struct ieee80211_mgmt *mgmt;
1046         size_t buf_len;
1047         u8 *buf;
1048         u8 chan;
1049
1050         /* FIXME: come up with a proper value */
1051         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1052         if (!buf)
1053                 return NULL;
1054
1055         /*
1056          * Do not send DS Channel parameter for directed probe requests
1057          * in order to maximize the chance that we get a response.  Some
1058          * badly-behaved APs don't respond when this parameter is included.
1059          */
1060         if (directed)
1061                 chan = 0;
1062         else
1063                 chan = ieee80211_frequency_to_channel(
1064                         local->hw.conf.channel->center_freq);
1065
1066         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1067                                            local->hw.conf.channel->band,
1068                                            ratemask, chan);
1069
1070         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1071                                      ssid, ssid_len,
1072                                      buf, buf_len);
1073         if (!skb)
1074                 goto out;
1075
1076         if (dst) {
1077                 mgmt = (struct ieee80211_mgmt *) skb->data;
1078                 memcpy(mgmt->da, dst, ETH_ALEN);
1079                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1080         }
1081
1082         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1083
1084  out:
1085         kfree(buf);
1086
1087         return skb;
1088 }
1089
1090 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1091                               const u8 *ssid, size_t ssid_len,
1092                               const u8 *ie, size_t ie_len,
1093                               u32 ratemask, bool directed, bool no_cck)
1094 {
1095         struct sk_buff *skb;
1096
1097         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1098                                         ie, ie_len, directed);
1099         if (skb) {
1100                 if (no_cck)
1101                         IEEE80211_SKB_CB(skb)->flags |=
1102                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1103                 ieee80211_tx_skb(sdata, skb);
1104         }
1105 }
1106
1107 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1108                             struct ieee802_11_elems *elems,
1109                             enum ieee80211_band band)
1110 {
1111         struct ieee80211_supported_band *sband;
1112         struct ieee80211_rate *bitrates;
1113         size_t num_rates;
1114         u32 supp_rates;
1115         int i, j;
1116         sband = local->hw.wiphy->bands[band];
1117
1118         if (!sband) {
1119                 WARN_ON(1);
1120                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1121         }
1122
1123         bitrates = sband->bitrates;
1124         num_rates = sband->n_bitrates;
1125         supp_rates = 0;
1126         for (i = 0; i < elems->supp_rates_len +
1127                      elems->ext_supp_rates_len; i++) {
1128                 u8 rate = 0;
1129                 int own_rate;
1130                 if (i < elems->supp_rates_len)
1131                         rate = elems->supp_rates[i];
1132                 else if (elems->ext_supp_rates)
1133                         rate = elems->ext_supp_rates
1134                                 [i - elems->supp_rates_len];
1135                 own_rate = 5 * (rate & 0x7f);
1136                 for (j = 0; j < num_rates; j++)
1137                         if (bitrates[j].bitrate == own_rate)
1138                                 supp_rates |= BIT(j);
1139         }
1140         return supp_rates;
1141 }
1142
1143 void ieee80211_stop_device(struct ieee80211_local *local)
1144 {
1145         ieee80211_led_radio(local, false);
1146         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1147
1148         cancel_work_sync(&local->reconfig_filter);
1149
1150         flush_workqueue(local->workqueue);
1151         drv_stop(local);
1152 }
1153
1154 int ieee80211_reconfig(struct ieee80211_local *local)
1155 {
1156         struct ieee80211_hw *hw = &local->hw;
1157         struct ieee80211_sub_if_data *sdata;
1158         struct sta_info *sta;
1159         int res, i;
1160
1161 #ifdef CONFIG_PM
1162         if (local->suspended)
1163                 local->resuming = true;
1164
1165         if (local->wowlan) {
1166                 local->wowlan = false;
1167                 res = drv_resume(local);
1168                 if (res < 0) {
1169                         local->resuming = false;
1170                         return res;
1171                 }
1172                 if (res == 0)
1173                         goto wake_up;
1174                 WARN_ON(res > 1);
1175                 /*
1176                  * res is 1, which means the driver requested
1177                  * to go through a regular reset on wakeup.
1178                  */
1179         }
1180 #endif
1181         /* everything else happens only if HW was up & running */
1182         if (!local->open_count)
1183                 goto wake_up;
1184
1185         /*
1186          * Upon resume hardware can sometimes be goofy due to
1187          * various platform / driver / bus issues, so restarting
1188          * the device may at times not work immediately. Propagate
1189          * the error.
1190          */
1191         res = drv_start(local);
1192         if (res) {
1193                 WARN(local->suspended, "Hardware became unavailable "
1194                      "upon resume. This could be a software issue "
1195                      "prior to suspend or a hardware issue.\n");
1196                 return res;
1197         }
1198
1199         /* setup fragmentation threshold */
1200         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1201
1202         /* setup RTS threshold */
1203         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1204
1205         /* reset coverage class */
1206         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1207
1208         ieee80211_led_radio(local, true);
1209         ieee80211_mod_tpt_led_trig(local,
1210                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1211
1212         /* add interfaces */
1213         list_for_each_entry(sdata, &local->interfaces, list) {
1214                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1215                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1216                     ieee80211_sdata_running(sdata))
1217                         res = drv_add_interface(local, sdata);
1218         }
1219
1220         /* add STAs back */
1221         mutex_lock(&local->sta_mtx);
1222         list_for_each_entry(sta, &local->sta_list, list) {
1223                 if (sta->uploaded) {
1224                         enum ieee80211_sta_state state;
1225
1226                         for (state = IEEE80211_STA_NOTEXIST;
1227                              state < sta->sta_state - 1; state++)
1228                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
1229                                                       state, state + 1));
1230                 }
1231         }
1232         mutex_unlock(&local->sta_mtx);
1233
1234         /* reconfigure tx conf */
1235         list_for_each_entry(sdata, &local->interfaces, list) {
1236                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1237                     sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1238                     !ieee80211_sdata_running(sdata))
1239                         continue;
1240
1241                 for (i = 0; i < hw->queues; i++)
1242                         drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1243         }
1244
1245         /* reconfigure hardware */
1246         ieee80211_hw_config(local, ~0);
1247
1248         ieee80211_configure_filter(local);
1249
1250         /* Finally also reconfigure all the BSS information */
1251         list_for_each_entry(sdata, &local->interfaces, list) {
1252                 u32 changed;
1253
1254                 if (!ieee80211_sdata_running(sdata))
1255                         continue;
1256
1257                 /* common change flags for all interface types */
1258                 changed = BSS_CHANGED_ERP_CTS_PROT |
1259                           BSS_CHANGED_ERP_PREAMBLE |
1260                           BSS_CHANGED_ERP_SLOT |
1261                           BSS_CHANGED_HT |
1262                           BSS_CHANGED_BASIC_RATES |
1263                           BSS_CHANGED_BEACON_INT |
1264                           BSS_CHANGED_BSSID |
1265                           BSS_CHANGED_CQM |
1266                           BSS_CHANGED_QOS |
1267                           BSS_CHANGED_IDLE;
1268
1269                 switch (sdata->vif.type) {
1270                 case NL80211_IFTYPE_STATION:
1271                         changed |= BSS_CHANGED_ASSOC |
1272                                    BSS_CHANGED_ARP_FILTER;
1273                         mutex_lock(&sdata->u.mgd.mtx);
1274                         ieee80211_bss_info_change_notify(sdata, changed);
1275                         mutex_unlock(&sdata->u.mgd.mtx);
1276                         break;
1277                 case NL80211_IFTYPE_ADHOC:
1278                         changed |= BSS_CHANGED_IBSS;
1279                         /* fall through */
1280                 case NL80211_IFTYPE_AP:
1281                         changed |= BSS_CHANGED_SSID;
1282
1283                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1284                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1285
1286                         /* fall through */
1287                 case NL80211_IFTYPE_MESH_POINT:
1288                         changed |= BSS_CHANGED_BEACON |
1289                                    BSS_CHANGED_BEACON_ENABLED;
1290                         ieee80211_bss_info_change_notify(sdata, changed);
1291                         break;
1292                 case NL80211_IFTYPE_WDS:
1293                         break;
1294                 case NL80211_IFTYPE_AP_VLAN:
1295                 case NL80211_IFTYPE_MONITOR:
1296                         /* ignore virtual */
1297                         break;
1298                 case NL80211_IFTYPE_UNSPECIFIED:
1299                 case NUM_NL80211_IFTYPES:
1300                 case NL80211_IFTYPE_P2P_CLIENT:
1301                 case NL80211_IFTYPE_P2P_GO:
1302                         WARN_ON(1);
1303                         break;
1304                 }
1305         }
1306
1307         ieee80211_recalc_ps(local, -1);
1308
1309         /*
1310          * The sta might be in psm against the ap (e.g. because
1311          * this was the state before a hw restart), so we
1312          * explicitly send a null packet in order to make sure
1313          * it'll sync against the ap (and get out of psm).
1314          */
1315         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1316                 list_for_each_entry(sdata, &local->interfaces, list) {
1317                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1318                                 continue;
1319
1320                         ieee80211_send_nullfunc(local, sdata, 0);
1321                 }
1322         }
1323
1324         /*
1325          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1326          * sessions can be established after a resume.
1327          *
1328          * Also tear down aggregation sessions since reconfiguring
1329          * them in a hardware restart scenario is not easily done
1330          * right now, and the hardware will have lost information
1331          * about the sessions, but we and the AP still think they
1332          * are active. This is really a workaround though.
1333          */
1334         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1335                 mutex_lock(&local->sta_mtx);
1336
1337                 list_for_each_entry(sta, &local->sta_list, list) {
1338                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1339                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1340                 }
1341
1342                 mutex_unlock(&local->sta_mtx);
1343         }
1344
1345         /* add back keys */
1346         list_for_each_entry(sdata, &local->interfaces, list)
1347                 if (ieee80211_sdata_running(sdata))
1348                         ieee80211_enable_keys(sdata);
1349
1350  wake_up:
1351         ieee80211_wake_queues_by_reason(hw,
1352                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1353
1354         /*
1355          * If this is for hw restart things are still running.
1356          * We may want to change that later, however.
1357          */
1358         if (!local->suspended)
1359                 return 0;
1360
1361 #ifdef CONFIG_PM
1362         /* first set suspended false, then resuming */
1363         local->suspended = false;
1364         mb();
1365         local->resuming = false;
1366
1367         list_for_each_entry(sdata, &local->interfaces, list) {
1368                 switch(sdata->vif.type) {
1369                 case NL80211_IFTYPE_STATION:
1370                         ieee80211_sta_restart(sdata);
1371                         break;
1372                 case NL80211_IFTYPE_ADHOC:
1373                         ieee80211_ibss_restart(sdata);
1374                         break;
1375                 case NL80211_IFTYPE_MESH_POINT:
1376                         ieee80211_mesh_restart(sdata);
1377                         break;
1378                 default:
1379                         break;
1380                 }
1381         }
1382
1383         mod_timer(&local->sta_cleanup, jiffies + 1);
1384
1385         mutex_lock(&local->sta_mtx);
1386         list_for_each_entry(sta, &local->sta_list, list)
1387                 mesh_plink_restart(sta);
1388         mutex_unlock(&local->sta_mtx);
1389 #else
1390         WARN_ON(1);
1391 #endif
1392         return 0;
1393 }
1394
1395 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1396 {
1397         struct ieee80211_sub_if_data *sdata;
1398         struct ieee80211_local *local;
1399         struct ieee80211_key *key;
1400
1401         if (WARN_ON(!vif))
1402                 return;
1403
1404         sdata = vif_to_sdata(vif);
1405         local = sdata->local;
1406
1407         if (WARN_ON(!local->resuming))
1408                 return;
1409
1410         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1411                 return;
1412
1413         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1414
1415         mutex_lock(&local->key_mtx);
1416         list_for_each_entry(key, &sdata->key_list, list)
1417                 key->flags |= KEY_FLAG_TAINTED;
1418         mutex_unlock(&local->key_mtx);
1419 }
1420 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1421
1422 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1423                           enum ieee80211_smps_mode *smps_mode)
1424 {
1425         if (ifmgd->associated) {
1426                 *smps_mode = ifmgd->ap_smps;
1427
1428                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1429                         if (ifmgd->powersave)
1430                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1431                         else
1432                                 *smps_mode = IEEE80211_SMPS_OFF;
1433                 }
1434
1435                 return 1;
1436         }
1437
1438         return 0;
1439 }
1440
1441 /* must hold iflist_mtx */
1442 void ieee80211_recalc_smps(struct ieee80211_local *local)
1443 {
1444         struct ieee80211_sub_if_data *sdata;
1445         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1446         int count = 0;
1447
1448         lockdep_assert_held(&local->iflist_mtx);
1449
1450         /*
1451          * This function could be improved to handle multiple
1452          * interfaces better, but right now it makes any
1453          * non-station interfaces force SM PS to be turned
1454          * off. If there are multiple station interfaces it
1455          * could also use the best possible mode, e.g. if
1456          * one is in static and the other in dynamic then
1457          * dynamic is ok.
1458          */
1459
1460         list_for_each_entry(sdata, &local->interfaces, list) {
1461                 if (!ieee80211_sdata_running(sdata))
1462                         continue;
1463                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1464                         goto set;
1465
1466                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1467
1468                 if (count > 1) {
1469                         smps_mode = IEEE80211_SMPS_OFF;
1470                         break;
1471                 }
1472         }
1473
1474         if (smps_mode == local->smps_mode)
1475                 return;
1476
1477  set:
1478         local->smps_mode = smps_mode;
1479         /* changed flag is auto-detected for this */
1480         ieee80211_hw_config(local, 0);
1481 }
1482
1483 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1484 {
1485         int i;
1486
1487         for (i = 0; i < n_ids; i++)
1488                 if (ids[i] == id)
1489                         return true;
1490         return false;
1491 }
1492
1493 /**
1494  * ieee80211_ie_split - split an IE buffer according to ordering
1495  *
1496  * @ies: the IE buffer
1497  * @ielen: the length of the IE buffer
1498  * @ids: an array with element IDs that are allowed before
1499  *      the split
1500  * @n_ids: the size of the element ID array
1501  * @offset: offset where to start splitting in the buffer
1502  *
1503  * This function splits an IE buffer by updating the @offset
1504  * variable to point to the location where the buffer should be
1505  * split.
1506  *
1507  * It assumes that the given IE buffer is well-formed, this
1508  * has to be guaranteed by the caller!
1509  *
1510  * It also assumes that the IEs in the buffer are ordered
1511  * correctly, if not the result of using this function will not
1512  * be ordered correctly either, i.e. it does no reordering.
1513  *
1514  * The function returns the offset where the next part of the
1515  * buffer starts, which may be @ielen if the entire (remainder)
1516  * of the buffer should be used.
1517  */
1518 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1519                           const u8 *ids, int n_ids, size_t offset)
1520 {
1521         size_t pos = offset;
1522
1523         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1524                 pos += 2 + ies[pos + 1];
1525
1526         return pos;
1527 }
1528
1529 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1530 {
1531         size_t pos = offset;
1532
1533         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1534                 pos += 2 + ies[pos + 1];
1535
1536         return pos;
1537 }
1538
1539 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1540                                             int rssi_min_thold,
1541                                             int rssi_max_thold)
1542 {
1543         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1544
1545         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1546                 return;
1547
1548         /*
1549          * Scale up threshold values before storing it, as the RSSI averaging
1550          * algorithm uses a scaled up value as well. Change this scaling
1551          * factor if the RSSI averaging algorithm changes.
1552          */
1553         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1554         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1555 }
1556
1557 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1558                                     int rssi_min_thold,
1559                                     int rssi_max_thold)
1560 {
1561         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1562
1563         WARN_ON(rssi_min_thold == rssi_max_thold ||
1564                 rssi_min_thold > rssi_max_thold);
1565
1566         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1567                                        rssi_max_thold);
1568 }
1569 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1570
1571 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1572 {
1573         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1574
1575         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1576 }
1577 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1578
1579 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1580                               u16 cap)
1581 {
1582         __le16 tmp;
1583
1584         *pos++ = WLAN_EID_HT_CAPABILITY;
1585         *pos++ = sizeof(struct ieee80211_ht_cap);
1586         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1587
1588         /* capability flags */
1589         tmp = cpu_to_le16(cap);
1590         memcpy(pos, &tmp, sizeof(u16));
1591         pos += sizeof(u16);
1592
1593         /* AMPDU parameters */
1594         *pos++ = ht_cap->ampdu_factor |
1595                  (ht_cap->ampdu_density <<
1596                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1597
1598         /* MCS set */
1599         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1600         pos += sizeof(ht_cap->mcs);
1601
1602         /* extended capabilities */
1603         pos += sizeof(__le16);
1604
1605         /* BF capabilities */
1606         pos += sizeof(__le32);
1607
1608         /* antenna selection */
1609         pos += sizeof(u8);
1610
1611         return pos;
1612 }
1613
1614 u8 *ieee80211_ie_build_ht_info(u8 *pos,
1615                                struct ieee80211_sta_ht_cap *ht_cap,
1616                                struct ieee80211_channel *channel,
1617                                enum nl80211_channel_type channel_type)
1618 {
1619         struct ieee80211_ht_info *ht_info;
1620         /* Build HT Information */
1621         *pos++ = WLAN_EID_HT_INFORMATION;
1622         *pos++ = sizeof(struct ieee80211_ht_info);
1623         ht_info = (struct ieee80211_ht_info *)pos;
1624         ht_info->control_chan =
1625                         ieee80211_frequency_to_channel(channel->center_freq);
1626         switch (channel_type) {
1627         case NL80211_CHAN_HT40MINUS:
1628                 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1629                 break;
1630         case NL80211_CHAN_HT40PLUS:
1631                 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1632                 break;
1633         case NL80211_CHAN_HT20:
1634         default:
1635                 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1636                 break;
1637         }
1638         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
1639                 ht_info->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1640
1641         /*
1642          * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and
1643          * RIFS Mode are reserved in IBSS mode, therefore keep them at 0
1644          */
1645         ht_info->operation_mode = 0x0000;
1646         ht_info->stbc_param = 0x0000;
1647
1648         /* It seems that Basic MCS set and Supported MCS set
1649            are identical for the first 10 bytes */
1650         memset(&ht_info->basic_set, 0, 16);
1651         memcpy(&ht_info->basic_set, &ht_cap->mcs, 10);
1652
1653         return pos + sizeof(struct ieee80211_ht_info);
1654 }
1655
1656 enum nl80211_channel_type
1657 ieee80211_ht_info_to_channel_type(struct ieee80211_ht_info *ht_info)
1658 {
1659         enum nl80211_channel_type channel_type;
1660
1661         if (!ht_info)
1662                 return NL80211_CHAN_NO_HT;
1663
1664         switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1665         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1666                 channel_type = NL80211_CHAN_HT20;
1667                 break;
1668         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1669                 channel_type = NL80211_CHAN_HT40PLUS;
1670                 break;
1671         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1672                 channel_type = NL80211_CHAN_HT40MINUS;
1673                 break;
1674         default:
1675                 channel_type = NL80211_CHAN_NO_HT;
1676         }
1677
1678         return channel_type;
1679 }
1680
1681 int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1682 {
1683         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1684         struct ieee80211_local *local = sdata->local;
1685         struct ieee80211_supported_band *sband;
1686         int rate;
1687         u8 i, rates, *pos;
1688
1689         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1690         rates = sband->n_bitrates;
1691         if (rates > 8)
1692                 rates = 8;
1693
1694         if (skb_tailroom(skb) < rates + 2)
1695                 return -ENOMEM;
1696
1697         pos = skb_put(skb, rates + 2);
1698         *pos++ = WLAN_EID_SUPP_RATES;
1699         *pos++ = rates;
1700         for (i = 0; i < rates; i++) {
1701                 rate = sband->bitrates[i].bitrate;
1702                 *pos++ = (u8) (rate / 5);
1703         }
1704
1705         return 0;
1706 }
1707
1708 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1709 {
1710         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1711         struct ieee80211_local *local = sdata->local;
1712         struct ieee80211_supported_band *sband;
1713         int rate;
1714         u8 i, exrates, *pos;
1715
1716         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1717         exrates = sband->n_bitrates;
1718         if (exrates > 8)
1719                 exrates -= 8;
1720         else
1721                 exrates = 0;
1722
1723         if (skb_tailroom(skb) < exrates + 2)
1724                 return -ENOMEM;
1725
1726         if (exrates) {
1727                 pos = skb_put(skb, exrates + 2);
1728                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1729                 *pos++ = exrates;
1730                 for (i = 8; i < sband->n_bitrates; i++) {
1731                         rate = sband->bitrates[i].bitrate;
1732                         *pos++ = (u8) (rate / 5);
1733                 }
1734         }
1735         return 0;
1736 }