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/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/bitmap.h>
  22 #include <linux/crc32.h>
  23 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
  24 #include <net/net_namespace.h>
  25 #endif
  26 #include <net/cfg80211.h>
  27 #include <net/rtnetlink.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "mesh.h"
  33 #include "wme.h"
  34 #include "led.h"
  35 #include "wep.h"
  36
  37 /* privid for wiphys to determine whether they belong to us or not */
  38 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  39
  40 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  41 {
  42         struct ieee80211_local *local;
  43         BUG_ON(!wiphy);
  44
  45         local = wiphy_priv(wiphy);
  46         return &local->hw;
  47 }
  48 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  49
  50 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  51                         enum nl80211_iftype type)
  52 {
  53         __le16 fc = hdr->frame_control;
  54
  55          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  56         if (len < 16)
  57                 return NULL;
  58
  59         if (ieee80211_is_data(fc)) {
  60                 if (len < 24) /* drop incorrect hdr len (data) */
  61                         return NULL;
  62
  63                 if (ieee80211_has_a4(fc))
  64                         return NULL;
  65                 if (ieee80211_has_tods(fc))
  66                         return hdr->addr1;
  67                 if (ieee80211_has_fromds(fc))
  68                         return hdr->addr2;
  69
  70                 return hdr->addr3;
  71         }
  72
  73         if (ieee80211_is_mgmt(fc)) {
  74                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  75                         return NULL;
  76                 return hdr->addr3;
  77         }
  78
  79         if (ieee80211_is_ctl(fc)) {
  80                 if(ieee80211_is_pspoll(fc))
  81                         return hdr->addr1;
  82
  83                 if (ieee80211_is_back_req(fc)) {
  84                         switch (type) {
  85                         case NL80211_IFTYPE_STATION:
  86                                 return hdr->addr2;
  87                         case NL80211_IFTYPE_AP:
  88                         case NL80211_IFTYPE_AP_VLAN:
  89                                 return hdr->addr1;
  90                         default:
  91                                 break; /* fall through to the return */
  92                         }
  93                 }
  94         }
  95
  96         return NULL;
  97 }
  98
  99 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
 100 {
 101         struct sk_buff *skb = tx->skb;
 102         struct ieee80211_hdr *hdr;
 103
 104         do {
 105                 hdr = (struct ieee80211_hdr *) skb->data;
 106                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 107         } while ((skb = skb->next));
 108 }
 109
 110 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 111                              int rate, int erp, int short_preamble)
 112 {
 113         int dur;
 114
 115         /* calculate duration (in microseconds, rounded up to next higher
 116          * integer if it includes a fractional microsecond) to send frame of
 117          * len bytes (does not include FCS) at the given rate. Duration will
 118          * also include SIFS.
 119          *
 120          * rate is in 100 kbps, so divident is multiplied by 10 in the
 121          * DIV_ROUND_UP() operations.
 122          */
 123
 124         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 125                 /*
 126                  * OFDM:
 127                  *
 128                  * N_DBPS = DATARATE x 4
 129                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 130                  *      (16 = SIGNAL time, 6 = tail bits)
 131                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 132                  *
 133                  * T_SYM = 4 usec
 134                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 135                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 136                  *      signal ext = 6 usec
 137                  */
 138                 dur = 16; /* SIFS + signal ext */
 139                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 140                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 141                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 142                                         4 * rate); /* T_SYM x N_SYM */
 143         } else {
 144                 /*
 145                  * 802.11b or 802.11g with 802.11b compatibility:
 146                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 147                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 148                  *
 149                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 150                  * aSIFSTime = 10 usec
 151                  * aPreambleLength = 144 usec or 72 usec with short preamble
 152                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 153                  */
 154                 dur = 10; /* aSIFSTime = 10 usec */
 155                 dur += short_preamble ? (72 + 24) : (144 + 48);
 156
 157                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 158         }
 159
 160         return dur;
 161 }
 162
 163 /* Exported duration function for driver use */
 164 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 165                                         struct ieee80211_vif *vif,
 166                                         size_t frame_len,
 167                                         struct ieee80211_rate *rate)
 168 {
 169         struct ieee80211_local *local = hw_to_local(hw);
 170         struct ieee80211_sub_if_data *sdata;
 171         u16 dur;
 172         int erp;
 173         bool short_preamble = false;
 174
 175         erp = 0;
 176         if (vif) {
 177                 sdata = vif_to_sdata(vif);
 178                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 179                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 180                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 181         }
 182
 183         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 184                                        short_preamble);
 185
 186         return cpu_to_le16(dur);
 187 }
 188 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 189
 190 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 191                               struct ieee80211_vif *vif, size_t frame_len,
 192                               const struct ieee80211_tx_info *frame_txctl)
 193 {
 194         struct ieee80211_local *local = hw_to_local(hw);
 195         struct ieee80211_rate *rate;
 196         struct ieee80211_sub_if_data *sdata;
 197         bool short_preamble;
 198         int erp;
 199         u16 dur;
 200         struct ieee80211_supported_band *sband;
 201
 202         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 203
 204         short_preamble = false;
 205
 206         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 207
 208         erp = 0;
 209         if (vif) {
 210                 sdata = vif_to_sdata(vif);
 211                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 212                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 213                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 214         }
 215
 216         /* CTS duration */
 217         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 218                                        erp, short_preamble);
 219         /* Data frame duration */
 220         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 221                                         erp, short_preamble);
 222         /* ACK duration */
 223         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 224                                         erp, short_preamble);
 225
 226         return cpu_to_le16(dur);
 227 }
 228 EXPORT_SYMBOL(ieee80211_rts_duration);
 229
 230 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 231                                     struct ieee80211_vif *vif,
 232                                     size_t frame_len,
 233                                     const struct ieee80211_tx_info *frame_txctl)
 234 {
 235         struct ieee80211_local *local = hw_to_local(hw);
 236         struct ieee80211_rate *rate;
 237         struct ieee80211_sub_if_data *sdata;
 238         bool short_preamble;
 239         int erp;
 240         u16 dur;
 241         struct ieee80211_supported_band *sband;
 242
 243         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 244
 245         short_preamble = false;
 246
 247         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 248         erp = 0;
 249         if (vif) {
 250                 sdata = vif_to_sdata(vif);
 251                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 252                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 253                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 254         }
 255
 256         /* Data frame duration */
 257         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 258                                        erp, short_preamble);
 259         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 260                 /* ACK duration */
 261                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 262                                                 erp, short_preamble);
 263         }
 264
 265         return cpu_to_le16(dur);
 266 }
 267 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 268
 269 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23))
 270 static bool ieee80211_all_queues_started(struct ieee80211_hw *hw)
 271 {
 272         unsigned int queue;
 273
 274         for (queue = 0; queue < hw->queues; queue++)
 275                 if (ieee80211_queue_stopped(hw, queue))
 276                         return false;
 277         return true;
 278 }
 279 #endif
 280
 281 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 282                                    enum queue_stop_reason reason)
 283 {
 284         struct ieee80211_local *local = hw_to_local(hw);
 285         struct ieee80211_sub_if_data *sdata;
 286
 287         if (WARN_ON(queue >= hw->queues))
 288                 return;
 289
 290         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 291
 292         if (local->queue_stop_reasons[queue] != 0)
 293                 /* someone still has this queue stopped */
 294                 return;
 295
 296         if (!skb_queue_empty(&local->pending[queue]))
 297                 tasklet_schedule(&local->tx_pending_tasklet);
 298
 299         rcu_read_lock();
 300         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 301 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27))
 302                 netif_tx_wake_queue(netdev_get_tx_queue(sdata->dev, queue));
 303 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23))
 304                 netif_start_subqueue(sdata->dev, queue);
 305 #else
 306                 if (ieee80211_all_queues_started(hw))
 307                         netif_wake_queue(sdata->dev);
 308 #endif
 309         rcu_read_unlock();
 310 }
 311
 312 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 313                                     enum queue_stop_reason reason)
 314 {
 315         struct ieee80211_local *local = hw_to_local(hw);
 316         unsigned long flags;
 317
 318         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 319         __ieee80211_wake_queue(hw, queue, reason);
 320         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 321 }
 322
 323 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 324 {
 325         ieee80211_wake_queue_by_reason(hw, queue,
 326                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 327 }
 328 EXPORT_SYMBOL(ieee80211_wake_queue);
 329
 330 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 331                                    enum queue_stop_reason reason)
 332 {
 333         struct ieee80211_local *local = hw_to_local(hw);
 334         struct ieee80211_sub_if_data *sdata;
 335
 336         if (WARN_ON(queue >= hw->queues))
 337                 return;
 338
 339         __set_bit(reason, &local->queue_stop_reasons[queue]);
 340
 341         rcu_read_lock();
 342         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 343 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27))
 344                 netif_tx_stop_queue(netdev_get_tx_queue(sdata->dev, queue));
 345 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23))
 346                 netif_stop_subqueue(sdata->dev, queue);
 347 #else
 348                 netif_stop_queue(sdata->dev);
 349 #endif
 350         rcu_read_unlock();
 351 }
 352
 353 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 354                                     enum queue_stop_reason reason)
 355 {
 356         struct ieee80211_local *local = hw_to_local(hw);
 357         unsigned long flags;
 358
 359         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 360         __ieee80211_stop_queue(hw, queue, reason);
 361         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 362 }
 363
 364 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 365 {
 366         ieee80211_stop_queue_by_reason(hw, queue,
 367                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 368 }
 369 EXPORT_SYMBOL(ieee80211_stop_queue);
 370
 371 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 372                                struct sk_buff *skb)
 373 {
 374         struct ieee80211_hw *hw = &local->hw;
 375         unsigned long flags;
 376         int queue = skb_get_queue_mapping(skb);
 377         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 378
 379         if (WARN_ON(!info->control.vif)) {
 380                 kfree_skb(skb);
 381                 return;
 382         }
 383
 384         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 385         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 386         __skb_queue_tail(&local->pending[queue], skb);
 387         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 388         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 389 }
 390
 391 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 392                                struct sk_buff_head *skbs)
 393 {
 394         struct ieee80211_hw *hw = &local->hw;
 395         struct sk_buff *skb;
 396         unsigned long flags;
 397         int queue, ret = 0, i;
 398
 399         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 400         for (i = 0; i < hw->queues; i++)
 401                 __ieee80211_stop_queue(hw, i,
 402                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 403
 404         while ((skb = skb_dequeue(skbs))) {
 405                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 406
 407                 if (WARN_ON(!info->control.vif)) {
 408                         kfree_skb(skb);
 409                         continue;
 410                 }
 411
 412                 ret++;
 413                 queue = skb_get_queue_mapping(skb);
 414                 __skb_queue_tail(&local->pending[queue], skb);
 415         }
 416
 417         for (i = 0; i < hw->queues; i++)
 418                 __ieee80211_wake_queue(hw, i,
 419                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 420         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 421
 422         return ret;
 423 }
 424
 425 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 426                                     enum queue_stop_reason reason)
 427 {
 428         struct ieee80211_local *local = hw_to_local(hw);
 429         unsigned long flags;
 430         int i;
 431
 432         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 433
 434         for (i = 0; i < hw->queues; i++)
 435                 __ieee80211_stop_queue(hw, i, reason);
 436
 437         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 438 }
 439
 440 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 441 {
 442         ieee80211_stop_queues_by_reason(hw,
 443                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 444 }
 445 EXPORT_SYMBOL(ieee80211_stop_queues);
 446
 447 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 448 {
 449         struct ieee80211_local *local = hw_to_local(hw);
 450         unsigned long flags;
 451         int ret;
 452
 453         if (WARN_ON(queue >= hw->queues))
 454                 return true;
 455
 456         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 457         ret = !!local->queue_stop_reasons[queue];
 458         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 459         return ret;
 460 }
 461 EXPORT_SYMBOL(ieee80211_queue_stopped);
 462
 463 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 464                                      enum queue_stop_reason reason)
 465 {
 466         struct ieee80211_local *local = hw_to_local(hw);
 467         unsigned long flags;
 468         int i;
 469
 470         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 471
 472         for (i = 0; i < hw->queues; i++)
 473                 __ieee80211_wake_queue(hw, i, reason);
 474
 475         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 476 }
 477
 478 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 479 {
 480         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 481 }
 482 EXPORT_SYMBOL(ieee80211_wake_queues);
 483
 484 void ieee80211_iterate_active_interfaces(
 485         struct ieee80211_hw *hw,
 486         void (*iterator)(void *data, u8 *mac,
 487                          struct ieee80211_vif *vif),
 488         void *data)
 489 {
 490         struct ieee80211_local *local = hw_to_local(hw);
 491         struct ieee80211_sub_if_data *sdata;
 492
 493         mutex_lock(&local->iflist_mtx);
 494
 495         list_for_each_entry(sdata, &local->interfaces, list) {
 496                 switch (sdata->vif.type) {
 497                 case __NL80211_IFTYPE_AFTER_LAST:
 498                 case NL80211_IFTYPE_UNSPECIFIED:
 499                 case NL80211_IFTYPE_MONITOR:
 500                 case NL80211_IFTYPE_AP_VLAN:
 501                         continue;
 502                 case NL80211_IFTYPE_AP:
 503                 case NL80211_IFTYPE_STATION:
 504                 case NL80211_IFTYPE_ADHOC:
 505                 case NL80211_IFTYPE_WDS:
 506                 case NL80211_IFTYPE_MESH_POINT:
 507                         break;
 508                 }
 509                 if (ieee80211_sdata_running(sdata))
 510                         iterator(data, sdata->vif.addr,
 511                                  &sdata->vif);
 512         }
 513
 514         mutex_unlock(&local->iflist_mtx);
 515 }
 516 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 517
 518 void ieee80211_iterate_active_interfaces_atomic(
 519         struct ieee80211_hw *hw,
 520         void (*iterator)(void *data, u8 *mac,
 521                          struct ieee80211_vif *vif),
 522         void *data)
 523 {
 524         struct ieee80211_local *local = hw_to_local(hw);
 525         struct ieee80211_sub_if_data *sdata;
 526
 527         rcu_read_lock();
 528
 529         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 530                 switch (sdata->vif.type) {
 531                 case __NL80211_IFTYPE_AFTER_LAST:
 532                 case NL80211_IFTYPE_UNSPECIFIED:
 533                 case NL80211_IFTYPE_MONITOR:
 534                 case NL80211_IFTYPE_AP_VLAN:
 535                         continue;
 536                 case NL80211_IFTYPE_AP:
 537                 case NL80211_IFTYPE_STATION:
 538                 case NL80211_IFTYPE_ADHOC:
 539                 case NL80211_IFTYPE_WDS:
 540                 case NL80211_IFTYPE_MESH_POINT:
 541                         break;
 542                 }
 543                 if (ieee80211_sdata_running(sdata))
 544                         iterator(data, sdata->vif.addr,
 545                                  &sdata->vif);
 546         }
 547
 548         rcu_read_unlock();
 549 }
 550 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 551
 552 /*
 553  * Nothing should have been stuffed into the workqueue during
 554  * the suspend->resume cycle. If this WARN is seen then there
 555  * is a bug with either the driver suspend or something in
 556  * mac80211 stuffing into the workqueue which we haven't yet
 557  * cleared during mac80211's suspend cycle.
 558  */
 559 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 560 {
 561         if (WARN(local->suspended && !local->resuming,
 562                  "queueing ieee80211 work while going to suspend\n"))
 563                 return false;
 564
 565         return true;
 566 }
 567
 568 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 569 {
 570         struct ieee80211_local *local = hw_to_local(hw);
 571
 572         if (!ieee80211_can_queue_work(local))
 573                 return;
 574
 575         queue_work(local->workqueue, work);
 576 }
 577 EXPORT_SYMBOL(ieee80211_queue_work);
 578
 579 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 580                                   struct delayed_work *dwork,
 581                                   unsigned long delay)
 582 {
 583         struct ieee80211_local *local = hw_to_local(hw);
 584
 585         if (!ieee80211_can_queue_work(local))
 586                 return;
 587
 588         queue_delayed_work(local->workqueue, dwork, delay);
 589 }
 590 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 591
 592 void ieee802_11_parse_elems(u8 *start, size_t len,
 593                             struct ieee802_11_elems *elems)
 594 {
 595         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 596 }
 597
 598 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 599                                struct ieee802_11_elems *elems,
 600                                u64 filter, u32 crc)
 601 {
 602         size_t left = len;
 603         u8 *pos = start;
 604         bool calc_crc = filter != 0;
 605
 606         memset(elems, 0, sizeof(*elems));
 607         elems->ie_start = start;
 608         elems->total_len = len;
 609
 610         while (left >= 2) {
 611                 u8 id, elen;
 612
 613                 id = *pos++;
 614                 elen = *pos++;
 615                 left -= 2;
 616
 617                 if (elen > left)
 618                         break;
 619
 620                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 621                         crc = crc32_be(crc, pos - 2, elen + 2);
 622
 623                 switch (id) {
 624                 case WLAN_EID_SSID:
 625                         elems->ssid = pos;
 626                         elems->ssid_len = elen;
 627                         break;
 628                 case WLAN_EID_SUPP_RATES:
 629                         elems->supp_rates = pos;
 630                         elems->supp_rates_len = elen;
 631                         break;
 632                 case WLAN_EID_FH_PARAMS:
 633                         elems->fh_params = pos;
 634                         elems->fh_params_len = elen;
 635                         break;
 636                 case WLAN_EID_DS_PARAMS:
 637                         elems->ds_params = pos;
 638                         elems->ds_params_len = elen;
 639                         break;
 640                 case WLAN_EID_CF_PARAMS:
 641                         elems->cf_params = pos;
 642                         elems->cf_params_len = elen;
 643                         break;
 644                 case WLAN_EID_TIM:
 645                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 646                                 elems->tim = (void *)pos;
 647                                 elems->tim_len = elen;
 648                         }
 649                         break;
 650                 case WLAN_EID_IBSS_PARAMS:
 651                         elems->ibss_params = pos;
 652                         elems->ibss_params_len = elen;
 653                         break;
 654                 case WLAN_EID_CHALLENGE:
 655                         elems->challenge = pos;
 656                         elems->challenge_len = elen;
 657                         break;
 658                 case WLAN_EID_VENDOR_SPECIFIC:
 659                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 660                             pos[2] == 0xf2) {
 661                                 /* Microsoft OUI (00:50:F2) */
 662
 663                                 if (calc_crc)
 664                                         crc = crc32_be(crc, pos - 2, elen + 2);
 665
 666                                 if (pos[3] == 1) {
 667                                         /* OUI Type 1 - WPA IE */
 668                                         elems->wpa = pos;
 669                                         elems->wpa_len = elen;
 670                                 } else if (elen >= 5 && pos[3] == 2) {
 671                                         /* OUI Type 2 - WMM IE */
 672                                         if (pos[4] == 0) {
 673                                                 elems->wmm_info = pos;
 674                                                 elems->wmm_info_len = elen;
 675                                         } else if (pos[4] == 1) {
 676                                                 elems->wmm_param = pos;
 677                                                 elems->wmm_param_len = elen;
 678                                         }
 679                                 }
 680                         }
 681                         break;
 682                 case WLAN_EID_RSN:
 683                         elems->rsn = pos;
 684                         elems->rsn_len = elen;
 685                         break;
 686                 case WLAN_EID_ERP_INFO:
 687                         elems->erp_info = pos;
 688                         elems->erp_info_len = elen;
 689                         break;
 690                 case WLAN_EID_EXT_SUPP_RATES:
 691                         elems->ext_supp_rates = pos;
 692                         elems->ext_supp_rates_len = elen;
 693                         break;
 694                 case WLAN_EID_HT_CAPABILITY:
 695                         if (elen >= sizeof(struct ieee80211_ht_cap))
 696                                 elems->ht_cap_elem = (void *)pos;
 697                         break;
 698                 case WLAN_EID_HT_INFORMATION:
 699                         if (elen >= sizeof(struct ieee80211_ht_info))
 700                                 elems->ht_info_elem = (void *)pos;
 701                         break;
 702                 case WLAN_EID_MESH_ID:
 703                         elems->mesh_id = pos;
 704                         elems->mesh_id_len = elen;
 705                         break;
 706                 case WLAN_EID_MESH_CONFIG:
 707                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 708                                 elems->mesh_config = (void *)pos;
 709                         break;
 710                 case WLAN_EID_PEER_LINK:
 711                         elems->peer_link = pos;
 712                         elems->peer_link_len = elen;
 713                         break;
 714                 case WLAN_EID_PREQ:
 715                         elems->preq = pos;
 716                         elems->preq_len = elen;
 717                         break;
 718                 case WLAN_EID_PREP:
 719                         elems->prep = pos;
 720                         elems->prep_len = elen;
 721                         break;
 722                 case WLAN_EID_PERR:
 723                         elems->perr = pos;
 724                         elems->perr_len = elen;
 725                         break;
 726                 case WLAN_EID_RANN:
 727                         if (elen >= sizeof(struct ieee80211_rann_ie))
 728                                 elems->rann = (void *)pos;
 729                         break;
 730                 case WLAN_EID_CHANNEL_SWITCH:
 731                         elems->ch_switch_elem = pos;
 732                         elems->ch_switch_elem_len = elen;
 733                         break;
 734                 case WLAN_EID_QUIET:
 735                         if (!elems->quiet_elem) {
 736                                 elems->quiet_elem = pos;
 737                                 elems->quiet_elem_len = elen;
 738                         }
 739                         elems->num_of_quiet_elem++;
 740                         break;
 741                 case WLAN_EID_COUNTRY:
 742                         elems->country_elem = pos;
 743                         elems->country_elem_len = elen;
 744                         break;
 745                 case WLAN_EID_PWR_CONSTRAINT:
 746                         elems->pwr_constr_elem = pos;
 747                         elems->pwr_constr_elem_len = elen;
 748                         break;
 749                 case WLAN_EID_TIMEOUT_INTERVAL:
 750                         elems->timeout_int = pos;
 751                         elems->timeout_int_len = elen;
 752                         break;
 753                 default:
 754                         break;
 755                 }
 756
 757                 left -= elen;
 758                 pos += elen;
 759         }
 760
 761         return crc;
 762 }
 763
 764 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 765 {
 766         struct ieee80211_local *local = sdata->local;
 767         struct ieee80211_tx_queue_params qparam;
 768         int queue;
 769         bool use_11b;
 770         int aCWmin, aCWmax;
 771
 772         if (!local->ops->conf_tx)
 773                 return;
 774
 775         memset(&qparam, 0, sizeof(qparam));
 776
 777         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 778                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 779
 780         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 781                 /* Set defaults according to 802.11-2007 Table 7-37 */
 782                 aCWmax = 1023;
 783                 if (use_11b)
 784                         aCWmin = 31;
 785                 else
 786                         aCWmin = 15;
 787
 788                 switch (queue) {
 789                 case 3: /* AC_BK */
 790                         qparam.cw_max = aCWmax;
 791                         qparam.cw_min = aCWmin;
 792                         qparam.txop = 0;
 793                         qparam.aifs = 7;
 794                         break;
 795                 default: /* never happens but let's not leave undefined */
 796                 case 2: /* AC_BE */
 797                         qparam.cw_max = aCWmax;
 798                         qparam.cw_min = aCWmin;
 799                         qparam.txop = 0;
 800                         qparam.aifs = 3;
 801                         break;
 802                 case 1: /* AC_VI */
 803                         qparam.cw_max = aCWmin;
 804                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 805                         if (use_11b)
 806                                 qparam.txop = 6016/32;
 807                         else
 808                                 qparam.txop = 3008/32;
 809                         qparam.aifs = 2;
 810                         break;
 811                 case 0: /* AC_VO */
 812                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 813                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 814                         if (use_11b)
 815                                 qparam.txop = 3264/32;
 816                         else
 817                                 qparam.txop = 1504/32;
 818                         qparam.aifs = 2;
 819                         break;
 820                 }
 821
 822                 qparam.uapsd = false;
 823
 824                 drv_conf_tx(local, queue, &qparam);
 825         }
 826 }
 827
 828 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 829                                   const size_t supp_rates_len,
 830                                   const u8 *supp_rates)
 831 {
 832         struct ieee80211_local *local = sdata->local;
 833         int i, have_higher_than_11mbit = 0;
 834
 835         /* cf. IEEE 802.11 9.2.12 */
 836         for (i = 0; i < supp_rates_len; i++)
 837                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 838                         have_higher_than_11mbit = 1;
 839
 840         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 841             have_higher_than_11mbit)
 842                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 843         else
 844                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 845
 846         ieee80211_set_wmm_default(sdata);
 847 }
 848
 849 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 850                               enum ieee80211_band band)
 851 {
 852         struct ieee80211_supported_band *sband;
 853         struct ieee80211_rate *bitrates;
 854         u32 mandatory_rates;
 855         enum ieee80211_rate_flags mandatory_flag;
 856         int i;
 857
 858         sband = local->hw.wiphy->bands[band];
 859         if (!sband) {
 860                 WARN_ON(1);
 861                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 862         }
 863
 864         if (band == IEEE80211_BAND_2GHZ)
 865                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 866         else
 867                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 868
 869         bitrates = sband->bitrates;
 870         mandatory_rates = 0;
 871         for (i = 0; i < sband->n_bitrates; i++)
 872                 if (bitrates[i].flags & mandatory_flag)
 873                         mandatory_rates |= BIT(i);
 874         return mandatory_rates;
 875 }
 876
 877 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 878                          u16 transaction, u16 auth_alg,
 879                          u8 *extra, size_t extra_len, const u8 *bssid,
 880                          const u8 *key, u8 key_len, u8 key_idx)
 881 {
 882         struct ieee80211_local *local = sdata->local;
 883         struct sk_buff *skb;
 884         struct ieee80211_mgmt *mgmt;
 885         int err;
 886
 887         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 888                             sizeof(*mgmt) + 6 + extra_len);
 889         if (!skb) {
 890                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 891                        "frame\n", sdata->name);
 892                 return;
 893         }
 894         skb_reserve(skb, local->hw.extra_tx_headroom);
 895
 896         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 897         memset(mgmt, 0, 24 + 6);
 898         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 899                                           IEEE80211_STYPE_AUTH);
 900         memcpy(mgmt->da, bssid, ETH_ALEN);
 901         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 902         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 903         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 904         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 905         mgmt->u.auth.status_code = cpu_to_le16(0);
 906         if (extra)
 907                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 908
 909         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 910                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 911                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 912                 WARN_ON(err);
 913         }
 914
 915         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 916         ieee80211_tx_skb(sdata, skb);
 917 }
 918
 919 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 920                              const u8 *ie, size_t ie_len,
 921                              enum ieee80211_band band)
 922 {
 923         struct ieee80211_supported_band *sband;
 924         u8 *pos;
 925         size_t offset = 0, noffset;
 926         int supp_rates_len, i;
 927
 928         sband = local->hw.wiphy->bands[band];
 929
 930         pos = buffer;
 931
 932         supp_rates_len = min_t(int, sband->n_bitrates, 8);
 933
 934         *pos++ = WLAN_EID_SUPP_RATES;
 935         *pos++ = supp_rates_len;
 936
 937         for (i = 0; i < supp_rates_len; i++) {
 938                 int rate = sband->bitrates[i].bitrate;
 939                 *pos++ = (u8) (rate / 5);
 940         }
 941
 942         /* insert "request information" if in custom IEs */
 943         if (ie && ie_len) {
 944                 static const u8 before_extrates[] = {
 945                         WLAN_EID_SSID,
 946                         WLAN_EID_SUPP_RATES,
 947                         WLAN_EID_REQUEST,
 948                 };
 949                 noffset = ieee80211_ie_split(ie, ie_len,
 950                                              before_extrates,
 951                                              ARRAY_SIZE(before_extrates),
 952                                              offset);
 953                 memcpy(pos, ie + offset, noffset - offset);
 954                 pos += noffset - offset;
 955                 offset = noffset;
 956         }
 957
 958         if (sband->n_bitrates > i) {
 959                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 960                 *pos++ = sband->n_bitrates - i;
 961
 962                 for (; i < sband->n_bitrates; i++) {
 963                         int rate = sband->bitrates[i].bitrate;
 964                         *pos++ = (u8) (rate / 5);
 965                 }
 966         }
 967
 968         /* insert custom IEs that go before HT */
 969         if (ie && ie_len) {
 970                 static const u8 before_ht[] = {
 971                         WLAN_EID_SSID,
 972                         WLAN_EID_SUPP_RATES,
 973                         WLAN_EID_REQUEST,
 974                         WLAN_EID_EXT_SUPP_RATES,
 975                         WLAN_EID_DS_PARAMS,
 976                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 977                 };
 978                 noffset = ieee80211_ie_split(ie, ie_len,
 979                                              before_ht, ARRAY_SIZE(before_ht),
 980                                              offset);
 981                 memcpy(pos, ie + offset, noffset - offset);
 982                 pos += noffset - offset;
 983                 offset = noffset;
 984         }
 985
 986         if (sband->ht_cap.ht_supported) {
 987                 u16 cap = sband->ht_cap.cap;
 988                 __le16 tmp;
 989
 990                 if (ieee80211_disable_40mhz_24ghz &&
 991                     sband->band == IEEE80211_BAND_2GHZ) {
 992                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 993                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 994                 }
 995
 996                 *pos++ = WLAN_EID_HT_CAPABILITY;
 997                 *pos++ = sizeof(struct ieee80211_ht_cap);
 998                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 999                 tmp = cpu_to_le16(cap);
1000                 memcpy(pos, &tmp, sizeof(u16));
1001                 pos += sizeof(u16);
1002                 *pos++ = sband->ht_cap.ampdu_factor |
1003                          (sband->ht_cap.ampdu_density <<
1004                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1005                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
1006                 pos += sizeof(sband->ht_cap.mcs);
1007                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
1008         }
1009
1010         /*
1011          * If adding more here, adjust code in main.c
1012          * that calculates local->scan_ies_len.
1013          */
1014
1015         /* add any remaining custom IEs */
1016         if (ie && ie_len) {
1017                 noffset = ie_len;
1018                 memcpy(pos, ie + offset, noffset - offset);
1019                 pos += noffset - offset;
1020         }
1021
1022         return pos - buffer;
1023 }
1024
1025 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1026                               const u8 *ssid, size_t ssid_len,
1027                               const u8 *ie, size_t ie_len)
1028 {
1029         struct ieee80211_local *local = sdata->local;
1030         struct sk_buff *skb;
1031         struct ieee80211_mgmt *mgmt;
1032         size_t buf_len;
1033         u8 *buf;
1034
1035         /* FIXME: come up with a proper value */
1036         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1037         if (!buf) {
1038                 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1039                        "buffer\n", sdata->name);
1040                 return;
1041         }
1042
1043         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1044                                            local->hw.conf.channel->band);
1045
1046         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1047                                      ssid, ssid_len,
1048                                      buf, buf_len);
1049
1050         if (dst) {
1051                 mgmt = (struct ieee80211_mgmt *) skb->data;
1052                 memcpy(mgmt->da, dst, ETH_ALEN);
1053                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1054         }
1055
1056         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1057         ieee80211_tx_skb(sdata, skb);
1058         kfree(buf);
1059 }
1060
1061 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1062                             struct ieee802_11_elems *elems,
1063                             enum ieee80211_band band)
1064 {
1065         struct ieee80211_supported_band *sband;
1066         struct ieee80211_rate *bitrates;
1067         size_t num_rates;
1068         u32 supp_rates;
1069         int i, j;
1070         sband = local->hw.wiphy->bands[band];
1071
1072         if (!sband) {
1073                 WARN_ON(1);
1074                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1075         }
1076
1077         bitrates = sband->bitrates;
1078         num_rates = sband->n_bitrates;
1079         supp_rates = 0;
1080         for (i = 0; i < elems->supp_rates_len +
1081                      elems->ext_supp_rates_len; i++) {
1082                 u8 rate = 0;
1083                 int own_rate;
1084                 if (i < elems->supp_rates_len)
1085                         rate = elems->supp_rates[i];
1086                 else if (elems->ext_supp_rates)
1087                         rate = elems->ext_supp_rates
1088                                 [i - elems->supp_rates_len];
1089                 own_rate = 5 * (rate & 0x7f);
1090                 for (j = 0; j < num_rates; j++)
1091                         if (bitrates[j].bitrate == own_rate)
1092                                 supp_rates |= BIT(j);
1093         }
1094         return supp_rates;
1095 }
1096
1097 void ieee80211_stop_device(struct ieee80211_local *local)
1098 {
1099         ieee80211_led_radio(local, false);
1100
1101         cancel_work_sync(&local->reconfig_filter);
1102
1103         flush_workqueue(local->workqueue);
1104         drv_stop(local);
1105 }
1106
1107 int ieee80211_reconfig(struct ieee80211_local *local)
1108 {
1109         struct ieee80211_hw *hw = &local->hw;
1110         struct ieee80211_sub_if_data *sdata;
1111         struct sta_info *sta;
1112         int res;
1113
1114         if (local->suspended)
1115                 local->resuming = true;
1116
1117         /* restart hardware */
1118         if (local->open_count) {
1119                 /*
1120                  * Upon resume hardware can sometimes be goofy due to
1121                  * various platform / driver / bus issues, so restarting
1122                  * the device may at times not work immediately. Propagate
1123                  * the error.
1124                  */
1125                 res = drv_start(local);
1126                 if (res) {
1127                         WARN(local->suspended, "Harware became unavailable "
1128                              "upon resume. This is could be a software issue"
1129                              "prior to suspend or a hardware issue\n");
1130                         return res;
1131                 }
1132
1133                 ieee80211_led_radio(local, true);
1134         }
1135
1136         /* add interfaces */
1137         list_for_each_entry(sdata, &local->interfaces, list) {
1138                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1139                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1140                     ieee80211_sdata_running(sdata))
1141                         res = drv_add_interface(local, &sdata->vif);
1142         }
1143
1144         /* add STAs back */
1145         mutex_lock(&local->sta_mtx);
1146         list_for_each_entry(sta, &local->sta_list, list) {
1147                 if (sta->uploaded) {
1148                         sdata = sta->sdata;
1149                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1150                                 sdata = container_of(sdata->bss,
1151                                              struct ieee80211_sub_if_data,
1152                                              u.ap);
1153
1154                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1155                 }
1156         }
1157         mutex_unlock(&local->sta_mtx);
1158
1159         /* Clear Suspend state so that ADDBA requests can be processed */
1160
1161         rcu_read_lock();
1162
1163         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1164                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1165                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1166                 }
1167         }
1168
1169         rcu_read_unlock();
1170
1171         /* setup RTS threshold */
1172         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1173
1174         /* reconfigure hardware */
1175         ieee80211_hw_config(local, ~0);
1176
1177         ieee80211_configure_filter(local);
1178
1179         /* Finally also reconfigure all the BSS information */
1180         list_for_each_entry(sdata, &local->interfaces, list) {
1181                 u32 changed = ~0;
1182                 if (!ieee80211_sdata_running(sdata))
1183                         continue;
1184                 switch (sdata->vif.type) {
1185                 case NL80211_IFTYPE_STATION:
1186                         /* disable beacon change bits */
1187                         changed &= ~(BSS_CHANGED_BEACON |
1188                                      BSS_CHANGED_BEACON_ENABLED);
1189                         /* fall through */
1190                 case NL80211_IFTYPE_ADHOC:
1191                 case NL80211_IFTYPE_AP:
1192                 case NL80211_IFTYPE_MESH_POINT:
1193                         ieee80211_bss_info_change_notify(sdata, changed);
1194                         break;
1195                 case NL80211_IFTYPE_WDS:
1196                         break;
1197                 case NL80211_IFTYPE_AP_VLAN:
1198                 case NL80211_IFTYPE_MONITOR:
1199                         /* ignore virtual */
1200                         break;
1201                 case NL80211_IFTYPE_UNSPECIFIED:
1202                 case __NL80211_IFTYPE_AFTER_LAST:
1203                         WARN_ON(1);
1204                         break;
1205                 }
1206         }
1207
1208         rcu_read_lock();
1209         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1210                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1211                         ieee80211_sta_tear_down_BA_sessions(sta);
1212                 }
1213         }
1214         rcu_read_unlock();
1215
1216         /* add back keys */
1217         list_for_each_entry(sdata, &local->interfaces, list)
1218                 if (ieee80211_sdata_running(sdata))
1219                         ieee80211_enable_keys(sdata);
1220
1221         ieee80211_wake_queues_by_reason(hw,
1222                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1223
1224         /*
1225          * If this is for hw restart things are still running.
1226          * We may want to change that later, however.
1227          */
1228         if (!local->suspended)
1229                 return 0;
1230
1231 #ifdef CONFIG_PM
1232         /* first set suspended false, then resuming */
1233         local->suspended = false;
1234         mb();
1235         local->resuming = false;
1236
1237         list_for_each_entry(sdata, &local->interfaces, list) {
1238                 switch(sdata->vif.type) {
1239                 case NL80211_IFTYPE_STATION:
1240                         ieee80211_sta_restart(sdata);
1241                         break;
1242                 case NL80211_IFTYPE_ADHOC:
1243                         ieee80211_ibss_restart(sdata);
1244                         break;
1245                 case NL80211_IFTYPE_MESH_POINT:
1246                         ieee80211_mesh_restart(sdata);
1247                         break;
1248                 default:
1249                         break;
1250                 }
1251         }
1252
1253         add_timer(&local->sta_cleanup);
1254
1255         mutex_lock(&local->sta_mtx);
1256         list_for_each_entry(sta, &local->sta_list, list)
1257                 mesh_plink_restart(sta);
1258         mutex_unlock(&local->sta_mtx);
1259 #else
1260         WARN_ON(1);
1261 #endif
1262         return 0;
1263 }
1264
1265 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1266                           enum ieee80211_smps_mode *smps_mode)
1267 {
1268         if (ifmgd->associated) {
1269                 *smps_mode = ifmgd->ap_smps;
1270
1271                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1272                         if (ifmgd->powersave)
1273                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1274                         else
1275                                 *smps_mode = IEEE80211_SMPS_OFF;
1276                 }
1277
1278                 return 1;
1279         }
1280
1281         return 0;
1282 }
1283
1284 /* must hold iflist_mtx */
1285 void ieee80211_recalc_smps(struct ieee80211_local *local,
1286                            struct ieee80211_sub_if_data *forsdata)
1287 {
1288         struct ieee80211_sub_if_data *sdata;
1289         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1290         int count = 0;
1291
1292         if (forsdata)
1293                 WARN_ON(!mutex_is_locked(&forsdata->u.mgd.mtx));
1294
1295         WARN_ON(!mutex_is_locked(&local->iflist_mtx));
1296
1297         /*
1298          * This function could be improved to handle multiple
1299          * interfaces better, but right now it makes any
1300          * non-station interfaces force SM PS to be turned
1301          * off. If there are multiple station interfaces it
1302          * could also use the best possible mode, e.g. if
1303          * one is in static and the other in dynamic then
1304          * dynamic is ok.
1305          */
1306
1307         list_for_each_entry(sdata, &local->interfaces, list) {
1308                 if (!netif_running(sdata->dev))
1309                         continue;
1310                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1311                         goto set;
1312                 if (sdata != forsdata) {
1313                         /*
1314                          * This nested is ok -- we are holding the iflist_mtx
1315                          * so can't get here twice or so. But it's required
1316                          * since normally we acquire it first and then the
1317                          * iflist_mtx.
1318                          */
1319                         mutex_lock_nested(&sdata->u.mgd.mtx, SINGLE_DEPTH_NESTING);
1320                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1321                         mutex_unlock(&sdata->u.mgd.mtx);
1322                 } else
1323                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1324
1325                 if (count > 1) {
1326                         smps_mode = IEEE80211_SMPS_OFF;
1327                         break;
1328                 }
1329         }
1330
1331         if (smps_mode == local->smps_mode)
1332                 return;
1333
1334  set:
1335         local->smps_mode = smps_mode;
1336         /* changed flag is auto-detected for this */
1337         ieee80211_hw_config(local, 0);
1338 }
1339
1340 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1341 {
1342         int i;
1343
1344         for (i = 0; i < n_ids; i++)
1345                 if (ids[i] == id)
1346                         return true;
1347         return false;
1348 }
1349
1350 /**
1351  * ieee80211_ie_split - split an IE buffer according to ordering
1352  *
1353  * @ies: the IE buffer
1354  * @ielen: the length of the IE buffer
1355  * @ids: an array with element IDs that are allowed before
1356  *      the split
1357  * @n_ids: the size of the element ID array
1358  * @offset: offset where to start splitting in the buffer
1359  *
1360  * This function splits an IE buffer by updating the @offset
1361  * variable to point to the location where the buffer should be
1362  * split.
1363  *
1364  * It assumes that the given IE buffer is well-formed, this
1365  * has to be guaranteed by the caller!
1366  *
1367  * It also assumes that the IEs in the buffer are ordered
1368  * correctly, if not the result of using this function will not
1369  * be ordered correctly either, i.e. it does no reordering.
1370  *
1371  * The function returns the offset where the next part of the
1372  * buffer starts, which may be @ielen if the entire (remainder)
1373  * of the buffer should be used.
1374  */
1375 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1376                           const u8 *ids, int n_ids, size_t offset)
1377 {
1378         size_t pos = offset;
1379
1380         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1381                 pos += 2 + ies[pos + 1];
1382
1383         return pos;
1384 }
1385
1386 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1387 {
1388         size_t pos = offset;
1389
1390         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1391                 pos += 2 + ies[pos + 1];
1392
1393         return pos;
1394 }