net/mac80211/util.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * utilities for mac80211
  12  */
  13
  14 #include <net/mac80211.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/export.h>
  17 #include <linux/types.h>
  18 #include <linux/slab.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/crc32.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/rtnetlink.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wme.h"
  33 #include "led.h"
  34 #include "wep.h"
  35
  36 /* privid for wiphys to determine whether they belong to us or not */
  37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  38
  39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  40 {
  41         struct ieee80211_local *local;
  42         BUG_ON(!wiphy);
  43
  44         local = wiphy_priv(wiphy);
  45         return &local->hw;
  46 }
  47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  48
  49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  50                         enum nl80211_iftype type)
  51 {
  52         __le16 fc = hdr->frame_control;
  53
  54          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  55         if (len < 16)
  56                 return NULL;
  57
  58         if (ieee80211_is_data(fc)) {
  59                 if (len < 24) /* drop incorrect hdr len (data) */
  60                         return NULL;
  61
  62                 if (ieee80211_has_a4(fc))
  63                         return NULL;
  64                 if (ieee80211_has_tods(fc))
  65                         return hdr->addr1;
  66                 if (ieee80211_has_fromds(fc))
  67                         return hdr->addr2;
  68
  69                 return hdr->addr3;
  70         }
  71
  72         if (ieee80211_is_mgmt(fc)) {
  73                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  74                         return NULL;
  75                 return hdr->addr3;
  76         }
  77
  78         if (ieee80211_is_ctl(fc)) {
  79                 if(ieee80211_is_pspoll(fc))
  80                         return hdr->addr1;
  81
  82                 if (ieee80211_is_back_req(fc)) {
  83                         switch (type) {
  84                         case NL80211_IFTYPE_STATION:
  85                                 return hdr->addr2;
  86                         case NL80211_IFTYPE_AP:
  87                         case NL80211_IFTYPE_AP_VLAN:
  88                                 return hdr->addr1;
  89                         default:
  90                                 break; /* fall through to the return */
  91                         }
  92                 }
  93         }
  94
  95         return NULL;
  96 }
  97
  98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  99 {
 100         struct sk_buff *skb;
 101         struct ieee80211_hdr *hdr;
 102
 103         skb_queue_walk(&tx->skbs, skb) {
 104                 hdr = (struct ieee80211_hdr *) skb->data;
 105                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 106         }
 107 }
 108
 109 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
 110                              int rate, int erp, int short_preamble)
 111 {
 112         int dur;
 113
 114         /* calculate duration (in microseconds, rounded up to next higher
 115          * integer if it includes a fractional microsecond) to send frame of
 116          * len bytes (does not include FCS) at the given rate. Duration will
 117          * also include SIFS.
 118          *
 119          * rate is in 100 kbps, so divident is multiplied by 10 in the
 120          * DIV_ROUND_UP() operations.
 121          */
 122
 123         if (band == IEEE80211_BAND_5GHZ || erp) {
 124                 /*
 125                  * OFDM:
 126                  *
 127                  * N_DBPS = DATARATE x 4
 128                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 129                  *      (16 = SIGNAL time, 6 = tail bits)
 130                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 131                  *
 132                  * T_SYM = 4 usec
 133                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 134                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 135                  *      signal ext = 6 usec
 136                  */
 137                 dur = 16; /* SIFS + signal ext */
 138                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 139                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 140                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 141                                         4 * rate); /* T_SYM x N_SYM */
 142         } else {
 143                 /*
 144                  * 802.11b or 802.11g with 802.11b compatibility:
 145                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 146                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 147                  *
 148                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 149                  * aSIFSTime = 10 usec
 150                  * aPreambleLength = 144 usec or 72 usec with short preamble
 151                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 152                  */
 153                 dur = 10; /* aSIFSTime = 10 usec */
 154                 dur += short_preamble ? (72 + 24) : (144 + 48);
 155
 156                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 157         }
 158
 159         return dur;
 160 }
 161
 162 /* Exported duration function for driver use */
 163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 164                                         struct ieee80211_vif *vif,
 165                                         enum ieee80211_band band,
 166                                         size_t frame_len,
 167                                         struct ieee80211_rate *rate)
 168 {
 169         struct ieee80211_sub_if_data *sdata;
 170         u16 dur;
 171         int erp;
 172         bool short_preamble = false;
 173
 174         erp = 0;
 175         if (vif) {
 176                 sdata = vif_to_sdata(vif);
 177                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 178                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 179                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 180         }
 181
 182         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
 183                                        short_preamble);
 184
 185         return cpu_to_le16(dur);
 186 }
 187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 188
 189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 190                               struct ieee80211_vif *vif, size_t frame_len,
 191                               const struct ieee80211_tx_info *frame_txctl)
 192 {
 193         struct ieee80211_local *local = hw_to_local(hw);
 194         struct ieee80211_rate *rate;
 195         struct ieee80211_sub_if_data *sdata;
 196         bool short_preamble;
 197         int erp;
 198         u16 dur;
 199         struct ieee80211_supported_band *sband;
 200
 201         sband = local->hw.wiphy->bands[frame_txctl->band];
 202
 203         short_preamble = false;
 204
 205         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 206
 207         erp = 0;
 208         if (vif) {
 209                 sdata = vif_to_sdata(vif);
 210                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 211                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 212                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 213         }
 214
 215         /* CTS duration */
 216         dur = ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 217                                        erp, short_preamble);
 218         /* Data frame duration */
 219         dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
 220                                         erp, short_preamble);
 221         /* ACK duration */
 222         dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 223                                         erp, short_preamble);
 224
 225         return cpu_to_le16(dur);
 226 }
 227 EXPORT_SYMBOL(ieee80211_rts_duration);
 228
 229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 230                                     struct ieee80211_vif *vif,
 231                                     size_t frame_len,
 232                                     const struct ieee80211_tx_info *frame_txctl)
 233 {
 234         struct ieee80211_local *local = hw_to_local(hw);
 235         struct ieee80211_rate *rate;
 236         struct ieee80211_sub_if_data *sdata;
 237         bool short_preamble;
 238         int erp;
 239         u16 dur;
 240         struct ieee80211_supported_band *sband;
 241
 242         sband = local->hw.wiphy->bands[frame_txctl->band];
 243
 244         short_preamble = false;
 245
 246         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 247         erp = 0;
 248         if (vif) {
 249                 sdata = vif_to_sdata(vif);
 250                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 251                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 252                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 253         }
 254
 255         /* Data frame duration */
 256         dur = ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
 257                                        erp, short_preamble);
 258         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 259                 /* ACK duration */
 260                 dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
 261                                                 erp, short_preamble);
 262         }
 263
 264         return cpu_to_le16(dur);
 265 }
 266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 269 {
 270         struct ieee80211_sub_if_data *sdata;
 271         int n_acs = IEEE80211_NUM_ACS;
 272
 273         if (local->hw.queues < IEEE80211_NUM_ACS)
 274                 n_acs = 1;
 275
 276         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 277                 int ac;
 278
 279                 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 280                         continue;
 281
 282                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 283                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 284                         continue;
 285
 286                 for (ac = 0; ac < n_acs; ac++) {
 287                         int ac_queue = sdata->vif.hw_queue[ac];
 288
 289                         if (ac_queue == queue ||
 290                             (sdata->vif.cab_queue == queue &&
 291                              local->queue_stop_reasons[ac_queue] == 0 &&
 292                              skb_queue_empty(&local->pending[ac_queue])))
 293                                 netif_wake_subqueue(sdata->dev, ac);
 294                 }
 295         }
 296 }
 297
 298 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 299                                    enum queue_stop_reason reason)
 300 {
 301         struct ieee80211_local *local = hw_to_local(hw);
 302
 303         trace_wake_queue(local, queue, reason);
 304
 305         if (WARN_ON(queue >= hw->queues))
 306                 return;
 307
 308         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 309                 return;
 310
 311         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 312
 313         if (local->queue_stop_reasons[queue] != 0)
 314                 /* someone still has this queue stopped */
 315                 return;
 316
 317         if (skb_queue_empty(&local->pending[queue])) {
 318                 rcu_read_lock();
 319                 ieee80211_propagate_queue_wake(local, queue);
 320                 rcu_read_unlock();
 321         } else
 322                 tasklet_schedule(&local->tx_pending_tasklet);
 323 }
 324
 325 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 326                                     enum queue_stop_reason reason)
 327 {
 328         struct ieee80211_local *local = hw_to_local(hw);
 329         unsigned long flags;
 330
 331         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 332         __ieee80211_wake_queue(hw, queue, reason);
 333         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 334 }
 335
 336 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 337 {
 338         ieee80211_wake_queue_by_reason(hw, queue,
 339                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 340 }
 341 EXPORT_SYMBOL(ieee80211_wake_queue);
 342
 343 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 344                                    enum queue_stop_reason reason)
 345 {
 346         struct ieee80211_local *local = hw_to_local(hw);
 347         struct ieee80211_sub_if_data *sdata;
 348         int n_acs = IEEE80211_NUM_ACS;
 349
 350         trace_stop_queue(local, queue, reason);
 351
 352         if (WARN_ON(queue >= hw->queues))
 353                 return;
 354
 355         if (test_bit(reason, &local->queue_stop_reasons[queue]))
 356                 return;
 357
 358         __set_bit(reason, &local->queue_stop_reasons[queue]);
 359
 360         if (local->hw.queues < IEEE80211_NUM_ACS)
 361                 n_acs = 1;
 362
 363         rcu_read_lock();
 364         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 365                 int ac;
 366
 367                 for (ac = 0; ac < n_acs; ac++) {
 368                         if (sdata->vif.hw_queue[ac] == queue ||
 369                             sdata->vif.cab_queue == queue)
 370                                 netif_stop_subqueue(sdata->dev, ac);
 371                 }
 372         }
 373         rcu_read_unlock();
 374 }
 375
 376 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 377                                     enum queue_stop_reason reason)
 378 {
 379         struct ieee80211_local *local = hw_to_local(hw);
 380         unsigned long flags;
 381
 382         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 383         __ieee80211_stop_queue(hw, queue, reason);
 384         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 385 }
 386
 387 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 388 {
 389         ieee80211_stop_queue_by_reason(hw, queue,
 390                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 391 }
 392 EXPORT_SYMBOL(ieee80211_stop_queue);
 393
 394 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 395                                struct sk_buff *skb)
 396 {
 397         struct ieee80211_hw *hw = &local->hw;
 398         unsigned long flags;
 399         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 400         int queue = info->hw_queue;
 401
 402         if (WARN_ON(!info->control.vif)) {
 403                 kfree_skb(skb);
 404                 return;
 405         }
 406
 407         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 408         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 409         __skb_queue_tail(&local->pending[queue], skb);
 410         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 411         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 412 }
 413
 414 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 415                                    struct sk_buff_head *skbs,
 416                                    void (*fn)(void *data), void *data)
 417 {
 418         struct ieee80211_hw *hw = &local->hw;
 419         struct sk_buff *skb;
 420         unsigned long flags;
 421         int queue, i;
 422
 423         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 424         while ((skb = skb_dequeue(skbs))) {
 425                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 426
 427                 if (WARN_ON(!info->control.vif)) {
 428                         kfree_skb(skb);
 429                         continue;
 430                 }
 431
 432                 queue = info->hw_queue;
 433
 434                 __ieee80211_stop_queue(hw, queue,
 435                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 436
 437                 __skb_queue_tail(&local->pending[queue], skb);
 438         }
 439
 440         if (fn)
 441                 fn(data);
 442
 443         for (i = 0; i < hw->queues; i++)
 444                 __ieee80211_wake_queue(hw, i,
 445                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 446         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 447 }
 448
 449 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 450                                     enum queue_stop_reason reason)
 451 {
 452         struct ieee80211_local *local = hw_to_local(hw);
 453         unsigned long flags;
 454         int i;
 455
 456         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 457
 458         for (i = 0; i < hw->queues; i++)
 459                 __ieee80211_stop_queue(hw, i, reason);
 460
 461         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 462 }
 463
 464 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 465 {
 466         ieee80211_stop_queues_by_reason(hw,
 467                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 468 }
 469 EXPORT_SYMBOL(ieee80211_stop_queues);
 470
 471 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 472 {
 473         struct ieee80211_local *local = hw_to_local(hw);
 474         unsigned long flags;
 475         int ret;
 476
 477         if (WARN_ON(queue >= hw->queues))
 478                 return true;
 479
 480         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 481         ret = !!local->queue_stop_reasons[queue];
 482         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 483         return ret;
 484 }
 485 EXPORT_SYMBOL(ieee80211_queue_stopped);
 486
 487 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 488                                      enum queue_stop_reason reason)
 489 {
 490         struct ieee80211_local *local = hw_to_local(hw);
 491         unsigned long flags;
 492         int i;
 493
 494         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 495
 496         for (i = 0; i < hw->queues; i++)
 497                 __ieee80211_wake_queue(hw, i, reason);
 498
 499         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 500 }
 501
 502 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 503 {
 504         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 505 }
 506 EXPORT_SYMBOL(ieee80211_wake_queues);
 507
 508 void ieee80211_iterate_active_interfaces(
 509         struct ieee80211_hw *hw,
 510         void (*iterator)(void *data, u8 *mac,
 511                          struct ieee80211_vif *vif),
 512         void *data)
 513 {
 514         struct ieee80211_local *local = hw_to_local(hw);
 515         struct ieee80211_sub_if_data *sdata;
 516
 517         mutex_lock(&local->iflist_mtx);
 518
 519         list_for_each_entry(sdata, &local->interfaces, list) {
 520                 switch (sdata->vif.type) {
 521                 case NL80211_IFTYPE_MONITOR:
 522                 case NL80211_IFTYPE_AP_VLAN:
 523                         continue;
 524                 default:
 525                         break;
 526                 }
 527                 if (ieee80211_sdata_running(sdata))
 528                         iterator(data, sdata->vif.addr,
 529                                  &sdata->vif);
 530         }
 531
 532         mutex_unlock(&local->iflist_mtx);
 533 }
 534 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 535
 536 void ieee80211_iterate_active_interfaces_atomic(
 537         struct ieee80211_hw *hw,
 538         void (*iterator)(void *data, u8 *mac,
 539                          struct ieee80211_vif *vif),
 540         void *data)
 541 {
 542         struct ieee80211_local *local = hw_to_local(hw);
 543         struct ieee80211_sub_if_data *sdata;
 544
 545         rcu_read_lock();
 546
 547         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 548                 switch (sdata->vif.type) {
 549                 case NL80211_IFTYPE_MONITOR:
 550                 case NL80211_IFTYPE_AP_VLAN:
 551                         continue;
 552                 default:
 553                         break;
 554                 }
 555                 if (ieee80211_sdata_running(sdata))
 556                         iterator(data, sdata->vif.addr,
 557                                  &sdata->vif);
 558         }
 559
 560         rcu_read_unlock();
 561 }
 562 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 563
 564 /*
 565  * Nothing should have been stuffed into the workqueue during
 566  * the suspend->resume cycle. If this WARN is seen then there
 567  * is a bug with either the driver suspend or something in
 568  * mac80211 stuffing into the workqueue which we haven't yet
 569  * cleared during mac80211's suspend cycle.
 570  */
 571 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 572 {
 573         if (WARN(local->suspended && !local->resuming,
 574                  "queueing ieee80211 work while going to suspend\n"))
 575                 return false;
 576
 577         return true;
 578 }
 579
 580 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 581 {
 582         struct ieee80211_local *local = hw_to_local(hw);
 583
 584         if (!ieee80211_can_queue_work(local))
 585                 return;
 586
 587         queue_work(local->workqueue, work);
 588 }
 589 EXPORT_SYMBOL(ieee80211_queue_work);
 590
 591 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 592                                   struct delayed_work *dwork,
 593                                   unsigned long delay)
 594 {
 595         struct ieee80211_local *local = hw_to_local(hw);
 596
 597         if (!ieee80211_can_queue_work(local))
 598                 return;
 599
 600         queue_delayed_work(local->workqueue, dwork, delay);
 601 }
 602 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 603
 604 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 605                                struct ieee802_11_elems *elems,
 606                                u64 filter, u32 crc)
 607 {
 608         size_t left = len;
 609         u8 *pos = start;
 610         bool calc_crc = filter != 0;
 611         DECLARE_BITMAP(seen_elems, 256);
 612
 613         bitmap_zero(seen_elems, 256);
 614         memset(elems, 0, sizeof(*elems));
 615         elems->ie_start = start;
 616         elems->total_len = len;
 617
 618         while (left >= 2) {
 619                 u8 id, elen;
 620                 bool elem_parse_failed;
 621
 622                 id = *pos++;
 623                 elen = *pos++;
 624                 left -= 2;
 625
 626                 if (elen > left) {
 627                         elems->parse_error = true;
 628                         break;
 629                 }
 630
 631                 if (id != WLAN_EID_VENDOR_SPECIFIC &&
 632                     id != WLAN_EID_QUIET &&
 633                     test_bit(id, seen_elems)) {
 634                         elems->parse_error = true;
 635                         left -= elen;
 636                         pos += elen;
 637                         continue;
 638                 }
 639
 640                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 641                         crc = crc32_be(crc, pos - 2, elen + 2);
 642
 643                 elem_parse_failed = false;
 644
 645                 switch (id) {
 646                 case WLAN_EID_SSID:
 647                         elems->ssid = pos;
 648                         elems->ssid_len = elen;
 649                         break;
 650                 case WLAN_EID_SUPP_RATES:
 651                         elems->supp_rates = pos;
 652                         elems->supp_rates_len = elen;
 653                         break;
 654                 case WLAN_EID_FH_PARAMS:
 655                         elems->fh_params = pos;
 656                         elems->fh_params_len = elen;
 657                         break;
 658                 case WLAN_EID_DS_PARAMS:
 659                         elems->ds_params = pos;
 660                         elems->ds_params_len = elen;
 661                         break;
 662                 case WLAN_EID_CF_PARAMS:
 663                         elems->cf_params = pos;
 664                         elems->cf_params_len = elen;
 665                         break;
 666                 case WLAN_EID_TIM:
 667                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 668                                 elems->tim = (void *)pos;
 669                                 elems->tim_len = elen;
 670                         } else
 671                                 elem_parse_failed = true;
 672                         break;
 673                 case WLAN_EID_IBSS_PARAMS:
 674                         elems->ibss_params = pos;
 675                         elems->ibss_params_len = elen;
 676                         break;
 677                 case WLAN_EID_CHALLENGE:
 678                         elems->challenge = pos;
 679                         elems->challenge_len = elen;
 680                         break;
 681                 case WLAN_EID_VENDOR_SPECIFIC:
 682                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 683                             pos[2] == 0xf2) {
 684                                 /* Microsoft OUI (00:50:F2) */
 685
 686                                 if (calc_crc)
 687                                         crc = crc32_be(crc, pos - 2, elen + 2);
 688
 689                                 if (pos[3] == 1) {
 690                                         /* OUI Type 1 - WPA IE */
 691                                         elems->wpa = pos;
 692                                         elems->wpa_len = elen;
 693                                 } else if (elen >= 5 && pos[3] == 2) {
 694                                         /* OUI Type 2 - WMM IE */
 695                                         if (pos[4] == 0) {
 696                                                 elems->wmm_info = pos;
 697                                                 elems->wmm_info_len = elen;
 698                                         } else if (pos[4] == 1) {
 699                                                 elems->wmm_param = pos;
 700                                                 elems->wmm_param_len = elen;
 701                                         }
 702                                 }
 703                         }
 704                         break;
 705                 case WLAN_EID_RSN:
 706                         elems->rsn = pos;
 707                         elems->rsn_len = elen;
 708                         break;
 709                 case WLAN_EID_ERP_INFO:
 710                         elems->erp_info = pos;
 711                         elems->erp_info_len = elen;
 712                         break;
 713                 case WLAN_EID_EXT_SUPP_RATES:
 714                         elems->ext_supp_rates = pos;
 715                         elems->ext_supp_rates_len = elen;
 716                         break;
 717                 case WLAN_EID_HT_CAPABILITY:
 718                         if (elen >= sizeof(struct ieee80211_ht_cap))
 719                                 elems->ht_cap_elem = (void *)pos;
 720                         else
 721                                 elem_parse_failed = true;
 722                         break;
 723                 case WLAN_EID_HT_OPERATION:
 724                         if (elen >= sizeof(struct ieee80211_ht_operation))
 725                                 elems->ht_operation = (void *)pos;
 726                         else
 727                                 elem_parse_failed = true;
 728                         break;
 729                 case WLAN_EID_MESH_ID:
 730                         elems->mesh_id = pos;
 731                         elems->mesh_id_len = elen;
 732                         break;
 733                 case WLAN_EID_MESH_CONFIG:
 734                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 735                                 elems->mesh_config = (void *)pos;
 736                         else
 737                                 elem_parse_failed = true;
 738                         break;
 739                 case WLAN_EID_PEER_MGMT:
 740                         elems->peering = pos;
 741                         elems->peering_len = elen;
 742                         break;
 743                 case WLAN_EID_PREQ:
 744                         elems->preq = pos;
 745                         elems->preq_len = elen;
 746                         break;
 747                 case WLAN_EID_PREP:
 748                         elems->prep = pos;
 749                         elems->prep_len = elen;
 750                         break;
 751                 case WLAN_EID_PERR:
 752                         elems->perr = pos;
 753                         elems->perr_len = elen;
 754                         break;
 755                 case WLAN_EID_RANN:
 756                         if (elen >= sizeof(struct ieee80211_rann_ie))
 757                                 elems->rann = (void *)pos;
 758                         else
 759                                 elem_parse_failed = true;
 760                         break;
 761                 case WLAN_EID_CHANNEL_SWITCH:
 762                         elems->ch_switch_elem = pos;
 763                         elems->ch_switch_elem_len = elen;
 764                         break;
 765                 case WLAN_EID_QUIET:
 766                         if (!elems->quiet_elem) {
 767                                 elems->quiet_elem = pos;
 768                                 elems->quiet_elem_len = elen;
 769                         }
 770                         elems->num_of_quiet_elem++;
 771                         break;
 772                 case WLAN_EID_COUNTRY:
 773                         elems->country_elem = pos;
 774                         elems->country_elem_len = elen;
 775                         break;
 776                 case WLAN_EID_PWR_CONSTRAINT:
 777                         elems->pwr_constr_elem = pos;
 778                         elems->pwr_constr_elem_len = elen;
 779                         break;
 780                 case WLAN_EID_TIMEOUT_INTERVAL:
 781                         elems->timeout_int = pos;
 782                         elems->timeout_int_len = elen;
 783                         break;
 784                 default:
 785                         break;
 786                 }
 787
 788                 if (elem_parse_failed)
 789                         elems->parse_error = true;
 790                 else
 791                         set_bit(id, seen_elems);
 792
 793                 left -= elen;
 794                 pos += elen;
 795         }
 796
 797         if (left != 0)
 798                 elems->parse_error = true;
 799
 800         return crc;
 801 }
 802
 803 void ieee802_11_parse_elems(u8 *start, size_t len,
 804                             struct ieee802_11_elems *elems)
 805 {
 806         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 807 }
 808
 809 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 810                                bool bss_notify)
 811 {
 812         struct ieee80211_local *local = sdata->local;
 813         struct ieee80211_tx_queue_params qparam;
 814         int ac;
 815         bool use_11b, enable_qos;
 816         int aCWmin, aCWmax;
 817
 818         if (!local->ops->conf_tx)
 819                 return;
 820
 821         if (local->hw.queues < IEEE80211_NUM_ACS)
 822                 return;
 823
 824         memset(&qparam, 0, sizeof(qparam));
 825
 826         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 827                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 828
 829         /*
 830          * By default disable QoS in STA mode for old access points, which do
 831          * not support 802.11e. New APs will provide proper queue parameters,
 832          * that we will configure later.
 833          */
 834         enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 835
 836         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 837                 /* Set defaults according to 802.11-2007 Table 7-37 */
 838                 aCWmax = 1023;
 839                 if (use_11b)
 840                         aCWmin = 31;
 841                 else
 842                         aCWmin = 15;
 843
 844                 if (enable_qos) {
 845                         switch (ac) {
 846                         case IEEE80211_AC_BK:
 847                                 qparam.cw_max = aCWmax;
 848                                 qparam.cw_min = aCWmin;
 849                                 qparam.txop = 0;
 850                                 qparam.aifs = 7;
 851                                 break;
 852                         /* never happens but let's not leave undefined */
 853                         default:
 854                         case IEEE80211_AC_BE:
 855                                 qparam.cw_max = aCWmax;
 856                                 qparam.cw_min = aCWmin;
 857                                 qparam.txop = 0;
 858                                 qparam.aifs = 3;
 859                                 break;
 860                         case IEEE80211_AC_VI:
 861                                 qparam.cw_max = aCWmin;
 862                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
 863                                 if (use_11b)
 864                                         qparam.txop = 6016/32;
 865                                 else
 866                                         qparam.txop = 3008/32;
 867                                 qparam.aifs = 2;
 868                                 break;
 869                         case IEEE80211_AC_VO:
 870                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
 871                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
 872                                 if (use_11b)
 873                                         qparam.txop = 3264/32;
 874                                 else
 875                                         qparam.txop = 1504/32;
 876                                 qparam.aifs = 2;
 877                                 break;
 878                         }
 879                 } else {
 880                         /* Confiure old 802.11b/g medium access rules. */
 881                         qparam.cw_max = aCWmax;
 882                         qparam.cw_min = aCWmin;
 883                         qparam.txop = 0;
 884                         qparam.aifs = 2;
 885                 }
 886
 887                 qparam.uapsd = false;
 888
 889                 sdata->tx_conf[ac] = qparam;
 890                 drv_conf_tx(local, sdata, ac, &qparam);
 891         }
 892
 893         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 894                 sdata->vif.bss_conf.qos = enable_qos;
 895                 if (bss_notify)
 896                         ieee80211_bss_info_change_notify(sdata,
 897                                                          BSS_CHANGED_QOS);
 898         }
 899 }
 900
 901 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 902                                   const size_t supp_rates_len,
 903                                   const u8 *supp_rates)
 904 {
 905         struct ieee80211_local *local = sdata->local;
 906         int i, have_higher_than_11mbit = 0;
 907
 908         /* cf. IEEE 802.11 9.2.12 */
 909         for (i = 0; i < supp_rates_len; i++)
 910                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 911                         have_higher_than_11mbit = 1;
 912
 913         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 914             have_higher_than_11mbit)
 915                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 916         else
 917                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 918
 919         ieee80211_set_wmm_default(sdata, true);
 920 }
 921
 922 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 923                               enum ieee80211_band band)
 924 {
 925         struct ieee80211_supported_band *sband;
 926         struct ieee80211_rate *bitrates;
 927         u32 mandatory_rates;
 928         enum ieee80211_rate_flags mandatory_flag;
 929         int i;
 930
 931         sband = local->hw.wiphy->bands[band];
 932         if (WARN_ON(!sband))
 933                 return 1;
 934
 935         if (band == IEEE80211_BAND_2GHZ)
 936                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 937         else
 938                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 939
 940         bitrates = sband->bitrates;
 941         mandatory_rates = 0;
 942         for (i = 0; i < sband->n_bitrates; i++)
 943                 if (bitrates[i].flags & mandatory_flag)
 944                         mandatory_rates |= BIT(i);
 945         return mandatory_rates;
 946 }
 947
 948 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 949                          u16 transaction, u16 auth_alg,
 950                          u8 *extra, size_t extra_len, const u8 *da,
 951                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 952 {
 953         struct ieee80211_local *local = sdata->local;
 954         struct sk_buff *skb;
 955         struct ieee80211_mgmt *mgmt;
 956         int err;
 957
 958         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 959                             sizeof(*mgmt) + 6 + extra_len);
 960         if (!skb)
 961                 return;
 962
 963         skb_reserve(skb, local->hw.extra_tx_headroom);
 964
 965         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 966         memset(mgmt, 0, 24 + 6);
 967         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 968                                           IEEE80211_STYPE_AUTH);
 969         memcpy(mgmt->da, da, ETH_ALEN);
 970         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 971         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 972         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 973         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 974         mgmt->u.auth.status_code = cpu_to_le16(0);
 975         if (extra)
 976                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 977
 978         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 979                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 980                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 981                 WARN_ON(err);
 982         }
 983
 984         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 985         ieee80211_tx_skb(sdata, skb);
 986 }
 987
 988 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 989                              const u8 *ie, size_t ie_len,
 990                              enum ieee80211_band band, u32 rate_mask,
 991                              u8 channel)
 992 {
 993         struct ieee80211_supported_band *sband;
 994         u8 *pos;
 995         size_t offset = 0, noffset;
 996         int supp_rates_len, i;
 997         u8 rates[32];
 998         int num_rates;
 999         int ext_rates_len;
1000
1001         sband = local->hw.wiphy->bands[band];
1002
1003         pos = buffer;
1004
1005         num_rates = 0;
1006         for (i = 0; i < sband->n_bitrates; i++) {
1007                 if ((BIT(i) & rate_mask) == 0)
1008                         continue; /* skip rate */
1009                 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1010         }
1011
1012         supp_rates_len = min_t(int, num_rates, 8);
1013
1014         *pos++ = WLAN_EID_SUPP_RATES;
1015         *pos++ = supp_rates_len;
1016         memcpy(pos, rates, supp_rates_len);
1017         pos += supp_rates_len;
1018
1019         /* insert "request information" if in custom IEs */
1020         if (ie && ie_len) {
1021                 static const u8 before_extrates[] = {
1022                         WLAN_EID_SSID,
1023                         WLAN_EID_SUPP_RATES,
1024                         WLAN_EID_REQUEST,
1025                 };
1026                 noffset = ieee80211_ie_split(ie, ie_len,
1027                                              before_extrates,
1028                                              ARRAY_SIZE(before_extrates),
1029                                              offset);
1030                 memcpy(pos, ie + offset, noffset - offset);
1031                 pos += noffset - offset;
1032                 offset = noffset;
1033         }
1034
1035         ext_rates_len = num_rates - supp_rates_len;
1036         if (ext_rates_len > 0) {
1037                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1038                 *pos++ = ext_rates_len;
1039                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1040                 pos += ext_rates_len;
1041         }
1042
1043         if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1044                 *pos++ = WLAN_EID_DS_PARAMS;
1045                 *pos++ = 1;
1046                 *pos++ = channel;
1047         }
1048
1049         /* insert custom IEs that go before HT */
1050         if (ie && ie_len) {
1051                 static const u8 before_ht[] = {
1052                         WLAN_EID_SSID,
1053                         WLAN_EID_SUPP_RATES,
1054                         WLAN_EID_REQUEST,
1055                         WLAN_EID_EXT_SUPP_RATES,
1056                         WLAN_EID_DS_PARAMS,
1057                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1058                 };
1059                 noffset = ieee80211_ie_split(ie, ie_len,
1060                                              before_ht, ARRAY_SIZE(before_ht),
1061                                              offset);
1062                 memcpy(pos, ie + offset, noffset - offset);
1063                 pos += noffset - offset;
1064                 offset = noffset;
1065         }
1066
1067         if (sband->ht_cap.ht_supported)
1068                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1069                                                 sband->ht_cap.cap);
1070
1071         /*
1072          * If adding more here, adjust code in main.c
1073          * that calculates local->scan_ies_len.
1074          */
1075
1076         /* add any remaining custom IEs */
1077         if (ie && ie_len) {
1078                 noffset = ie_len;
1079                 memcpy(pos, ie + offset, noffset - offset);
1080                 pos += noffset - offset;
1081         }
1082
1083         if (sband->vht_cap.vht_supported)
1084                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1085                                                  sband->vht_cap.cap);
1086
1087         return pos - buffer;
1088 }
1089
1090 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1091                                           u8 *dst, u32 ratemask,
1092                                           const u8 *ssid, size_t ssid_len,
1093                                           const u8 *ie, size_t ie_len,
1094                                           bool directed)
1095 {
1096         struct ieee80211_local *local = sdata->local;
1097         struct sk_buff *skb;
1098         struct ieee80211_mgmt *mgmt;
1099         size_t buf_len;
1100         u8 *buf;
1101         u8 chan;
1102
1103         /* FIXME: come up with a proper value */
1104         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1105         if (!buf)
1106                 return NULL;
1107
1108         /*
1109          * Do not send DS Channel parameter for directed probe requests
1110          * in order to maximize the chance that we get a response.  Some
1111          * badly-behaved APs don't respond when this parameter is included.
1112          */
1113         if (directed)
1114                 chan = 0;
1115         else
1116                 chan = ieee80211_frequency_to_channel(
1117                         local->hw.conf.channel->center_freq);
1118
1119         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1120                                            local->hw.conf.channel->band,
1121                                            ratemask, chan);
1122
1123         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1124                                      ssid, ssid_len,
1125                                      buf, buf_len);
1126         if (!skb)
1127                 goto out;
1128
1129         if (dst) {
1130                 mgmt = (struct ieee80211_mgmt *) skb->data;
1131                 memcpy(mgmt->da, dst, ETH_ALEN);
1132                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1133         }
1134
1135         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1136
1137  out:
1138         kfree(buf);
1139
1140         return skb;
1141 }
1142
1143 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1144                               const u8 *ssid, size_t ssid_len,
1145                               const u8 *ie, size_t ie_len,
1146                               u32 ratemask, bool directed, bool no_cck)
1147 {
1148         struct sk_buff *skb;
1149
1150         skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1151                                         ie, ie_len, directed);
1152         if (skb) {
1153                 if (no_cck)
1154                         IEEE80211_SKB_CB(skb)->flags |=
1155                                 IEEE80211_TX_CTL_NO_CCK_RATE;
1156                 ieee80211_tx_skb(sdata, skb);
1157         }
1158 }
1159
1160 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1161                             struct ieee802_11_elems *elems,
1162                             enum ieee80211_band band, u32 *basic_rates)
1163 {
1164         struct ieee80211_supported_band *sband;
1165         struct ieee80211_rate *bitrates;
1166         size_t num_rates;
1167         u32 supp_rates;
1168         int i, j;
1169         sband = local->hw.wiphy->bands[band];
1170
1171         if (WARN_ON(!sband))
1172                 return 1;
1173
1174         bitrates = sband->bitrates;
1175         num_rates = sband->n_bitrates;
1176         supp_rates = 0;
1177         for (i = 0; i < elems->supp_rates_len +
1178                      elems->ext_supp_rates_len; i++) {
1179                 u8 rate = 0;
1180                 int own_rate;
1181                 bool is_basic;
1182                 if (i < elems->supp_rates_len)
1183                         rate = elems->supp_rates[i];
1184                 else if (elems->ext_supp_rates)
1185                         rate = elems->ext_supp_rates
1186                                 [i - elems->supp_rates_len];
1187                 own_rate = 5 * (rate & 0x7f);
1188                 is_basic = !!(rate & 0x80);
1189
1190                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1191                         continue;
1192
1193                 for (j = 0; j < num_rates; j++) {
1194                         if (bitrates[j].bitrate == own_rate) {
1195                                 supp_rates |= BIT(j);
1196                                 if (basic_rates && is_basic)
1197                                         *basic_rates |= BIT(j);
1198                         }
1199                 }
1200         }
1201         return supp_rates;
1202 }
1203
1204 void ieee80211_stop_device(struct ieee80211_local *local)
1205 {
1206         ieee80211_led_radio(local, false);
1207         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1208
1209         cancel_work_sync(&local->reconfig_filter);
1210
1211         flush_workqueue(local->workqueue);
1212         drv_stop(local);
1213 }
1214
1215 int ieee80211_reconfig(struct ieee80211_local *local)
1216 {
1217         struct ieee80211_hw *hw = &local->hw;
1218         struct ieee80211_sub_if_data *sdata;
1219         struct sta_info *sta;
1220         int res, i;
1221
1222 #ifdef CONFIG_PM
1223         if (local->suspended)
1224                 local->resuming = true;
1225
1226         if (local->wowlan) {
1227                 local->wowlan = false;
1228                 res = drv_resume(local);
1229                 if (res < 0) {
1230                         local->resuming = false;
1231                         return res;
1232                 }
1233                 if (res == 0)
1234                         goto wake_up;
1235                 WARN_ON(res > 1);
1236                 /*
1237                  * res is 1, which means the driver requested
1238                  * to go through a regular reset on wakeup.
1239                  */
1240         }
1241 #endif
1242         /* everything else happens only if HW was up & running */
1243         if (!local->open_count)
1244                 goto wake_up;
1245
1246         /*
1247          * Upon resume hardware can sometimes be goofy due to
1248          * various platform / driver / bus issues, so restarting
1249          * the device may at times not work immediately. Propagate
1250          * the error.
1251          */
1252         res = drv_start(local);
1253         if (res) {
1254                 WARN(local->suspended, "Hardware became unavailable "
1255                      "upon resume. This could be a software issue "
1256                      "prior to suspend or a hardware issue.\n");
1257                 return res;
1258         }
1259
1260         /* setup fragmentation threshold */
1261         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1262
1263         /* setup RTS threshold */
1264         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1265
1266         /* reset coverage class */
1267         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1268
1269         ieee80211_led_radio(local, true);
1270         ieee80211_mod_tpt_led_trig(local,
1271                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1272
1273         /* add interfaces */
1274         sdata = rtnl_dereference(local->monitor_sdata);
1275         if (sdata) {
1276                 res = drv_add_interface(local, sdata);
1277                 if (WARN_ON(res)) {
1278                         rcu_assign_pointer(local->monitor_sdata, NULL);
1279                         synchronize_net();
1280                         kfree(sdata);
1281                 }
1282         }
1283
1284         list_for_each_entry(sdata, &local->interfaces, list) {
1285                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1286                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1287                     ieee80211_sdata_running(sdata))
1288                         res = drv_add_interface(local, sdata);
1289         }
1290
1291         /* add STAs back */
1292         mutex_lock(&local->sta_mtx);
1293         list_for_each_entry(sta, &local->sta_list, list) {
1294                 enum ieee80211_sta_state state;
1295
1296                 if (!sta->uploaded)
1297                         continue;
1298
1299                 /* AP-mode stations will be added later */
1300                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1301                         continue;
1302
1303                 for (state = IEEE80211_STA_NOTEXIST;
1304                      state < sta->sta_state; state++)
1305                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1306                                               state + 1));
1307         }
1308         mutex_unlock(&local->sta_mtx);
1309
1310         /* reconfigure tx conf */
1311         if (hw->queues >= IEEE80211_NUM_ACS) {
1312                 list_for_each_entry(sdata, &local->interfaces, list) {
1313                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1314                             sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1315                             !ieee80211_sdata_running(sdata))
1316                                 continue;
1317
1318                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1319                                 drv_conf_tx(local, sdata, i,
1320                                             &sdata->tx_conf[i]);
1321                 }
1322         }
1323
1324         /* reconfigure hardware */
1325         ieee80211_hw_config(local, ~0);
1326
1327         ieee80211_configure_filter(local);
1328
1329         /* Finally also reconfigure all the BSS information */
1330         list_for_each_entry(sdata, &local->interfaces, list) {
1331                 u32 changed;
1332
1333                 if (!ieee80211_sdata_running(sdata))
1334                         continue;
1335
1336                 /* common change flags for all interface types */
1337                 changed = BSS_CHANGED_ERP_CTS_PROT |
1338                           BSS_CHANGED_ERP_PREAMBLE |
1339                           BSS_CHANGED_ERP_SLOT |
1340                           BSS_CHANGED_HT |
1341                           BSS_CHANGED_BASIC_RATES |
1342                           BSS_CHANGED_BEACON_INT |
1343                           BSS_CHANGED_BSSID |
1344                           BSS_CHANGED_CQM |
1345                           BSS_CHANGED_QOS |
1346                           BSS_CHANGED_IDLE;
1347
1348                 switch (sdata->vif.type) {
1349                 case NL80211_IFTYPE_STATION:
1350                         changed |= BSS_CHANGED_ASSOC |
1351                                    BSS_CHANGED_ARP_FILTER;
1352                         mutex_lock(&sdata->u.mgd.mtx);
1353                         ieee80211_bss_info_change_notify(sdata, changed);
1354                         mutex_unlock(&sdata->u.mgd.mtx);
1355                         break;
1356                 case NL80211_IFTYPE_ADHOC:
1357                         changed |= BSS_CHANGED_IBSS;
1358                         /* fall through */
1359                 case NL80211_IFTYPE_AP:
1360                         changed |= BSS_CHANGED_SSID;
1361
1362                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1363                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1364
1365                         /* fall through */
1366                 case NL80211_IFTYPE_MESH_POINT:
1367                         changed |= BSS_CHANGED_BEACON |
1368                                    BSS_CHANGED_BEACON_ENABLED;
1369                         ieee80211_bss_info_change_notify(sdata, changed);
1370                         break;
1371                 case NL80211_IFTYPE_WDS:
1372                         break;
1373                 case NL80211_IFTYPE_AP_VLAN:
1374                 case NL80211_IFTYPE_MONITOR:
1375                         /* ignore virtual */
1376                         break;
1377                 case NL80211_IFTYPE_UNSPECIFIED:
1378                 case NUM_NL80211_IFTYPES:
1379                 case NL80211_IFTYPE_P2P_CLIENT:
1380                 case NL80211_IFTYPE_P2P_GO:
1381                         WARN_ON(1);
1382                         break;
1383                 }
1384         }
1385
1386         ieee80211_recalc_ps(local, -1);
1387
1388         /*
1389          * The sta might be in psm against the ap (e.g. because
1390          * this was the state before a hw restart), so we
1391          * explicitly send a null packet in order to make sure
1392          * it'll sync against the ap (and get out of psm).
1393          */
1394         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1395                 list_for_each_entry(sdata, &local->interfaces, list) {
1396                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1397                                 continue;
1398
1399                         ieee80211_send_nullfunc(local, sdata, 0);
1400                 }
1401         }
1402
1403         /* APs are now beaconing, add back stations */
1404         mutex_lock(&local->sta_mtx);
1405         list_for_each_entry(sta, &local->sta_list, list) {
1406                 enum ieee80211_sta_state state;
1407
1408                 if (!sta->uploaded)
1409                         continue;
1410
1411                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1412                         continue;
1413
1414                 for (state = IEEE80211_STA_NOTEXIST;
1415                      state < sta->sta_state; state++)
1416                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1417                                               state + 1));
1418         }
1419         mutex_unlock(&local->sta_mtx);
1420
1421         /* add back keys */
1422         list_for_each_entry(sdata, &local->interfaces, list)
1423                 if (ieee80211_sdata_running(sdata))
1424                         ieee80211_enable_keys(sdata);
1425
1426  wake_up:
1427         local->in_reconfig = false;
1428         barrier();
1429
1430         /*
1431          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1432          * sessions can be established after a resume.
1433          *
1434          * Also tear down aggregation sessions since reconfiguring
1435          * them in a hardware restart scenario is not easily done
1436          * right now, and the hardware will have lost information
1437          * about the sessions, but we and the AP still think they
1438          * are active. This is really a workaround though.
1439          */
1440         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1441                 mutex_lock(&local->sta_mtx);
1442
1443                 list_for_each_entry(sta, &local->sta_list, list) {
1444                         ieee80211_sta_tear_down_BA_sessions(sta, true);
1445                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1446                 }
1447
1448                 mutex_unlock(&local->sta_mtx);
1449         }
1450
1451         ieee80211_wake_queues_by_reason(hw,
1452                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1453
1454         /*
1455          * If this is for hw restart things are still running.
1456          * We may want to change that later, however.
1457          */
1458         if (!local->suspended)
1459                 return 0;
1460
1461 #ifdef CONFIG_PM
1462         /* first set suspended false, then resuming */
1463         local->suspended = false;
1464         mb();
1465         local->resuming = false;
1466
1467         list_for_each_entry(sdata, &local->interfaces, list) {
1468                 switch(sdata->vif.type) {
1469                 case NL80211_IFTYPE_STATION:
1470                         ieee80211_sta_restart(sdata);
1471                         break;
1472                 case NL80211_IFTYPE_ADHOC:
1473                         ieee80211_ibss_restart(sdata);
1474                         break;
1475                 case NL80211_IFTYPE_MESH_POINT:
1476                         ieee80211_mesh_restart(sdata);
1477                         break;
1478                 default:
1479                         break;
1480                 }
1481         }
1482
1483         mod_timer(&local->sta_cleanup, jiffies + 1);
1484
1485         mutex_lock(&local->sta_mtx);
1486         list_for_each_entry(sta, &local->sta_list, list)
1487                 mesh_plink_restart(sta);
1488         mutex_unlock(&local->sta_mtx);
1489 #else
1490         WARN_ON(1);
1491 #endif
1492         return 0;
1493 }
1494
1495 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1496 {
1497         struct ieee80211_sub_if_data *sdata;
1498         struct ieee80211_local *local;
1499         struct ieee80211_key *key;
1500
1501         if (WARN_ON(!vif))
1502                 return;
1503
1504         sdata = vif_to_sdata(vif);
1505         local = sdata->local;
1506
1507         if (WARN_ON(!local->resuming))
1508                 return;
1509
1510         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1511                 return;
1512
1513         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1514
1515         mutex_lock(&local->key_mtx);
1516         list_for_each_entry(key, &sdata->key_list, list)
1517                 key->flags |= KEY_FLAG_TAINTED;
1518         mutex_unlock(&local->key_mtx);
1519 }
1520 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1521
1522 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1523                           enum ieee80211_smps_mode *smps_mode)
1524 {
1525         if (ifmgd->associated) {
1526                 *smps_mode = ifmgd->ap_smps;
1527
1528                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1529                         if (ifmgd->powersave)
1530                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1531                         else
1532                                 *smps_mode = IEEE80211_SMPS_OFF;
1533                 }
1534
1535                 return 1;
1536         }
1537
1538         return 0;
1539 }
1540
1541 /* must hold iflist_mtx */
1542 void ieee80211_recalc_smps(struct ieee80211_local *local)
1543 {
1544         struct ieee80211_sub_if_data *sdata;
1545         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1546         int count = 0;
1547
1548         lockdep_assert_held(&local->iflist_mtx);
1549
1550         /*
1551          * This function could be improved to handle multiple
1552          * interfaces better, but right now it makes any
1553          * non-station interfaces force SM PS to be turned
1554          * off. If there are multiple station interfaces it
1555          * could also use the best possible mode, e.g. if
1556          * one is in static and the other in dynamic then
1557          * dynamic is ok.
1558          */
1559
1560         list_for_each_entry(sdata, &local->interfaces, list) {
1561                 if (!ieee80211_sdata_running(sdata))
1562                         continue;
1563                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1564                         goto set;
1565
1566                 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1567
1568                 if (count > 1) {
1569                         smps_mode = IEEE80211_SMPS_OFF;
1570                         break;
1571                 }
1572         }
1573
1574         if (smps_mode == local->smps_mode)
1575                 return;
1576
1577  set:
1578         local->smps_mode = smps_mode;
1579         /* changed flag is auto-detected for this */
1580         ieee80211_hw_config(local, 0);
1581 }
1582
1583 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1584 {
1585         int i;
1586
1587         for (i = 0; i < n_ids; i++)
1588                 if (ids[i] == id)
1589                         return true;
1590         return false;
1591 }
1592
1593 /**
1594  * ieee80211_ie_split - split an IE buffer according to ordering
1595  *
1596  * @ies: the IE buffer
1597  * @ielen: the length of the IE buffer
1598  * @ids: an array with element IDs that are allowed before
1599  *      the split
1600  * @n_ids: the size of the element ID array
1601  * @offset: offset where to start splitting in the buffer
1602  *
1603  * This function splits an IE buffer by updating the @offset
1604  * variable to point to the location where the buffer should be
1605  * split.
1606  *
1607  * It assumes that the given IE buffer is well-formed, this
1608  * has to be guaranteed by the caller!
1609  *
1610  * It also assumes that the IEs in the buffer are ordered
1611  * correctly, if not the result of using this function will not
1612  * be ordered correctly either, i.e. it does no reordering.
1613  *
1614  * The function returns the offset where the next part of the
1615  * buffer starts, which may be @ielen if the entire (remainder)
1616  * of the buffer should be used.
1617  */
1618 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1619                           const u8 *ids, int n_ids, size_t offset)
1620 {
1621         size_t pos = offset;
1622
1623         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1624                 pos += 2 + ies[pos + 1];
1625
1626         return pos;
1627 }
1628
1629 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1630 {
1631         size_t pos = offset;
1632
1633         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1634                 pos += 2 + ies[pos + 1];
1635
1636         return pos;
1637 }
1638
1639 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1640                                             int rssi_min_thold,
1641                                             int rssi_max_thold)
1642 {
1643         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1644
1645         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1646                 return;
1647
1648         /*
1649          * Scale up threshold values before storing it, as the RSSI averaging
1650          * algorithm uses a scaled up value as well. Change this scaling
1651          * factor if the RSSI averaging algorithm changes.
1652          */
1653         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1654         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1655 }
1656
1657 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1658                                     int rssi_min_thold,
1659                                     int rssi_max_thold)
1660 {
1661         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1662
1663         WARN_ON(rssi_min_thold == rssi_max_thold ||
1664                 rssi_min_thold > rssi_max_thold);
1665
1666         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1667                                        rssi_max_thold);
1668 }
1669 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1670
1671 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1672 {
1673         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1674
1675         _ieee80211_enable_rssi_reports(sdata, 0, 0);
1676 }
1677 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1678
1679 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1680                               u16 cap)
1681 {
1682         __le16 tmp;
1683
1684         *pos++ = WLAN_EID_HT_CAPABILITY;
1685         *pos++ = sizeof(struct ieee80211_ht_cap);
1686         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1687
1688         /* capability flags */
1689         tmp = cpu_to_le16(cap);
1690         memcpy(pos, &tmp, sizeof(u16));
1691         pos += sizeof(u16);
1692
1693         /* AMPDU parameters */
1694         *pos++ = ht_cap->ampdu_factor |
1695                  (ht_cap->ampdu_density <<
1696                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1697
1698         /* MCS set */
1699         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1700         pos += sizeof(ht_cap->mcs);
1701
1702         /* extended capabilities */
1703         pos += sizeof(__le16);
1704
1705         /* BF capabilities */
1706         pos += sizeof(__le32);
1707
1708         /* antenna selection */
1709         pos += sizeof(u8);
1710
1711         return pos;
1712 }
1713
1714 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1715                                                            u32 cap)
1716 {
1717         __le32 tmp;
1718
1719         *pos++ = WLAN_EID_VHT_CAPABILITY;
1720         *pos++ = sizeof(struct ieee80211_vht_capabilities);
1721         memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1722
1723         /* capability flags */
1724         tmp = cpu_to_le32(cap);
1725         memcpy(pos, &tmp, sizeof(u32));
1726         pos += sizeof(u32);
1727
1728         /* VHT MCS set */
1729         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1730         pos += sizeof(vht_cap->vht_mcs);
1731
1732         return pos;
1733 }
1734
1735 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1736                                struct ieee80211_channel *channel,
1737                                enum nl80211_channel_type channel_type,
1738                                u16 prot_mode)
1739 {
1740         struct ieee80211_ht_operation *ht_oper;
1741         /* Build HT Information */
1742         *pos++ = WLAN_EID_HT_OPERATION;
1743         *pos++ = sizeof(struct ieee80211_ht_operation);
1744         ht_oper = (struct ieee80211_ht_operation *)pos;
1745         ht_oper->primary_chan =
1746                         ieee80211_frequency_to_channel(channel->center_freq);
1747         switch (channel_type) {
1748         case NL80211_CHAN_HT40MINUS:
1749                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1750                 break;
1751         case NL80211_CHAN_HT40PLUS:
1752                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1753                 break;
1754         case NL80211_CHAN_HT20:
1755         default:
1756                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1757                 break;
1758         }
1759         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1760             channel_type != NL80211_CHAN_NO_HT &&
1761             channel_type != NL80211_CHAN_HT20)
1762                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1763
1764         ht_oper->operation_mode = cpu_to_le16(prot_mode);
1765         ht_oper->stbc_param = 0x0000;
1766
1767         /* It seems that Basic MCS set and Supported MCS set
1768            are identical for the first 10 bytes */
1769         memset(&ht_oper->basic_set, 0, 16);
1770         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1771
1772         return pos + sizeof(struct ieee80211_ht_operation);
1773 }
1774
1775 enum nl80211_channel_type
1776 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1777 {
1778         enum nl80211_channel_type channel_type;
1779
1780         if (!ht_oper)
1781                 return NL80211_CHAN_NO_HT;
1782
1783         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1784         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1785                 channel_type = NL80211_CHAN_HT20;
1786                 break;
1787         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1788                 channel_type = NL80211_CHAN_HT40PLUS;
1789                 break;
1790         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1791                 channel_type = NL80211_CHAN_HT40MINUS;
1792                 break;
1793         default:
1794                 channel_type = NL80211_CHAN_NO_HT;
1795         }
1796
1797         return channel_type;
1798 }
1799
1800 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1801                             struct sk_buff *skb, bool need_basic)
1802 {
1803         struct ieee80211_local *local = sdata->local;
1804         struct ieee80211_supported_band *sband;
1805         int rate;
1806         u8 i, rates, *pos;
1807         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1808
1809         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1810         rates = sband->n_bitrates;
1811         if (rates > 8)
1812                 rates = 8;
1813
1814         if (skb_tailroom(skb) < rates + 2)
1815                 return -ENOMEM;
1816
1817         pos = skb_put(skb, rates + 2);
1818         *pos++ = WLAN_EID_SUPP_RATES;
1819         *pos++ = rates;
1820         for (i = 0; i < rates; i++) {
1821                 u8 basic = 0;
1822                 if (need_basic && basic_rates & BIT(i))
1823                         basic = 0x80;
1824                 rate = sband->bitrates[i].bitrate;
1825                 *pos++ = basic | (u8) (rate / 5);
1826         }
1827
1828         return 0;
1829 }
1830
1831 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1832                                 struct sk_buff *skb, bool need_basic)
1833 {
1834         struct ieee80211_local *local = sdata->local;
1835         struct ieee80211_supported_band *sband;
1836         int rate;
1837         u8 i, exrates, *pos;
1838         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1839
1840         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1841         exrates = sband->n_bitrates;
1842         if (exrates > 8)
1843                 exrates -= 8;
1844         else
1845                 exrates = 0;
1846
1847         if (skb_tailroom(skb) < exrates + 2)
1848                 return -ENOMEM;
1849
1850         if (exrates) {
1851                 pos = skb_put(skb, exrates + 2);
1852                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1853                 *pos++ = exrates;
1854                 for (i = 8; i < sband->n_bitrates; i++) {
1855                         u8 basic = 0;
1856                         if (need_basic && basic_rates & BIT(i))
1857                                 basic = 0x80;
1858                         rate = sband->bitrates[i].bitrate;
1859                         *pos++ = basic | (u8) (rate / 5);
1860                 }
1861         }
1862         return 0;
1863 }
1864
1865 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1866 {
1867         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1868         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1869
1870         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1871                 /* non-managed type inferfaces */
1872                 return 0;
1873         }
1874         return ifmgd->ave_beacon_signal;
1875 }
1876 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);