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/wireless.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 = tx->skb;
 101         struct ieee80211_hdr *hdr;
 102
 103         do {
 104                 hdr = (struct ieee80211_hdr *) skb->data;
 105                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 106         } while ((skb = skb->next));
 107 }
 108
 109 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 110                              int rate, int erp, int short_preamble)
 111 {
 112         int dur;
 113
 114         /* calculate duration (in microseconds, rounded up to next higher
 115          * integer if it includes a fractional microsecond) to send frame of
 116          * len bytes (does not include FCS) at the given rate. Duration will
 117          * also include SIFS.
 118          *
 119          * rate is in 100 kbps, so divident is multiplied by 10 in the
 120          * DIV_ROUND_UP() operations.
 121          */
 122
 123         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 124                 /*
 125                  * OFDM:
 126                  *
 127                  * N_DBPS = DATARATE x 4
 128                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 129                  *      (16 = SIGNAL time, 6 = tail bits)
 130                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 131                  *
 132                  * T_SYM = 4 usec
 133                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 134                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 135                  *      signal ext = 6 usec
 136                  */
 137                 dur = 16; /* SIFS + signal ext */
 138                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 139                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 140                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 141                                         4 * rate); /* T_SYM x N_SYM */
 142         } else {
 143                 /*
 144                  * 802.11b or 802.11g with 802.11b compatibility:
 145                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 146                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 147                  *
 148                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 149                  * aSIFSTime = 10 usec
 150                  * aPreambleLength = 144 usec or 72 usec with short preamble
 151                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 152                  */
 153                 dur = 10; /* aSIFSTime = 10 usec */
 154                 dur += short_preamble ? (72 + 24) : (144 + 48);
 155
 156                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 157         }
 158
 159         return dur;
 160 }
 161
 162 /* Exported duration function for driver use */
 163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 164                                         struct ieee80211_vif *vif,
 165                                         size_t frame_len,
 166                                         struct ieee80211_rate *rate)
 167 {
 168         struct ieee80211_local *local = hw_to_local(hw);
 169         struct ieee80211_sub_if_data *sdata;
 170         u16 dur;
 171         int erp;
 172         bool short_preamble = false;
 173
 174         erp = 0;
 175         if (vif) {
 176                 sdata = vif_to_sdata(vif);
 177                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 178                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 179                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 180         }
 181
 182         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 183                                        short_preamble);
 184
 185         return cpu_to_le16(dur);
 186 }
 187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 188
 189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 190                               struct ieee80211_vif *vif, size_t frame_len,
 191                               const struct ieee80211_tx_info *frame_txctl)
 192 {
 193         struct ieee80211_local *local = hw_to_local(hw);
 194         struct ieee80211_rate *rate;
 195         struct ieee80211_sub_if_data *sdata;
 196         bool short_preamble;
 197         int erp;
 198         u16 dur;
 199         struct ieee80211_supported_band *sband;
 200
 201         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 202
 203         short_preamble = false;
 204
 205         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 206
 207         erp = 0;
 208         if (vif) {
 209                 sdata = vif_to_sdata(vif);
 210                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 211                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 212                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 213         }
 214
 215         /* CTS duration */
 216         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 217                                        erp, short_preamble);
 218         /* Data frame duration */
 219         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 220                                         erp, short_preamble);
 221         /* ACK duration */
 222         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 223                                         erp, short_preamble);
 224
 225         return cpu_to_le16(dur);
 226 }
 227 EXPORT_SYMBOL(ieee80211_rts_duration);
 228
 229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 230                                     struct ieee80211_vif *vif,
 231                                     size_t frame_len,
 232                                     const struct ieee80211_tx_info *frame_txctl)
 233 {
 234         struct ieee80211_local *local = hw_to_local(hw);
 235         struct ieee80211_rate *rate;
 236         struct ieee80211_sub_if_data *sdata;
 237         bool short_preamble;
 238         int erp;
 239         u16 dur;
 240         struct ieee80211_supported_band *sband;
 241
 242         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 243
 244         short_preamble = false;
 245
 246         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 247         erp = 0;
 248         if (vif) {
 249                 sdata = vif_to_sdata(vif);
 250                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 251                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 252                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 253         }
 254
 255         /* Data frame duration */
 256         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 257                                        erp, short_preamble);
 258         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 259                 /* ACK duration */
 260                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 261                                                 erp, short_preamble);
 262         }
 263
 264         return cpu_to_le16(dur);
 265 }
 266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 269                                    enum queue_stop_reason reason)
 270 {
 271         struct ieee80211_local *local = hw_to_local(hw);
 272         struct ieee80211_sub_if_data *sdata;
 273
 274         if (WARN_ON(queue >= hw->queues))
 275                 return;
 276
 277         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 278
 279         if (local->queue_stop_reasons[queue] != 0)
 280                 /* someone still has this queue stopped */
 281                 return;
 282
 283         if (skb_queue_empty(&local->pending[queue])) {
 284                 rcu_read_lock();
 285                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
 286                         netif_tx_wake_queue(netdev_get_tx_queue(sdata->dev, queue));
 287                 rcu_read_unlock();
 288         } else
 289                 tasklet_schedule(&local->tx_pending_tasklet);
 290 }
 291
 292 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 293                                     enum queue_stop_reason reason)
 294 {
 295         struct ieee80211_local *local = hw_to_local(hw);
 296         unsigned long flags;
 297
 298         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 299         __ieee80211_wake_queue(hw, queue, reason);
 300         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 301 }
 302
 303 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 304 {
 305         ieee80211_wake_queue_by_reason(hw, queue,
 306                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 307 }
 308 EXPORT_SYMBOL(ieee80211_wake_queue);
 309
 310 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 311                                    enum queue_stop_reason reason)
 312 {
 313         struct ieee80211_local *local = hw_to_local(hw);
 314         struct ieee80211_sub_if_data *sdata;
 315
 316         if (WARN_ON(queue >= hw->queues))
 317                 return;
 318
 319         __set_bit(reason, &local->queue_stop_reasons[queue]);
 320
 321         rcu_read_lock();
 322         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 323                 netif_tx_stop_queue(netdev_get_tx_queue(sdata->dev, queue));
 324         rcu_read_unlock();
 325 }
 326
 327 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 328                                     enum queue_stop_reason reason)
 329 {
 330         struct ieee80211_local *local = hw_to_local(hw);
 331         unsigned long flags;
 332
 333         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 334         __ieee80211_stop_queue(hw, queue, reason);
 335         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 336 }
 337
 338 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 339 {
 340         ieee80211_stop_queue_by_reason(hw, queue,
 341                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 342 }
 343 EXPORT_SYMBOL(ieee80211_stop_queue);
 344
 345 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 346                                struct sk_buff *skb)
 347 {
 348         struct ieee80211_hw *hw = &local->hw;
 349         unsigned long flags;
 350         int queue = skb_get_queue_mapping(skb);
 351         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 352
 353         if (WARN_ON(!info->control.vif)) {
 354                 kfree_skb(skb);
 355                 return;
 356         }
 357
 358         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 359         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 360         __skb_queue_tail(&local->pending[queue], skb);
 361         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 362         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 363 }
 364
 365 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 366                                struct sk_buff_head *skbs)
 367 {
 368         struct ieee80211_hw *hw = &local->hw;
 369         struct sk_buff *skb;
 370         unsigned long flags;
 371         int queue, ret = 0, i;
 372
 373         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 374         for (i = 0; i < hw->queues; i++)
 375                 __ieee80211_stop_queue(hw, i,
 376                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 377
 378         while ((skb = skb_dequeue(skbs))) {
 379                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 380
 381                 if (WARN_ON(!info->control.vif)) {
 382                         kfree_skb(skb);
 383                         continue;
 384                 }
 385
 386                 ret++;
 387                 queue = skb_get_queue_mapping(skb);
 388                 __skb_queue_tail(&local->pending[queue], skb);
 389         }
 390
 391         for (i = 0; i < hw->queues; i++)
 392                 __ieee80211_wake_queue(hw, i,
 393                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 394         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 395
 396         return ret;
 397 }
 398
 399 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 400                                     enum queue_stop_reason reason)
 401 {
 402         struct ieee80211_local *local = hw_to_local(hw);
 403         unsigned long flags;
 404         int i;
 405
 406         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 407
 408         for (i = 0; i < hw->queues; i++)
 409                 __ieee80211_stop_queue(hw, i, reason);
 410
 411         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 412 }
 413
 414 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 415 {
 416         ieee80211_stop_queues_by_reason(hw,
 417                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 418 }
 419 EXPORT_SYMBOL(ieee80211_stop_queues);
 420
 421 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 422 {
 423         struct ieee80211_local *local = hw_to_local(hw);
 424         unsigned long flags;
 425         int ret;
 426
 427         if (WARN_ON(queue >= hw->queues))
 428                 return true;
 429
 430         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 431         ret = !!local->queue_stop_reasons[queue];
 432         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 433         return ret;
 434 }
 435 EXPORT_SYMBOL(ieee80211_queue_stopped);
 436
 437 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 438                                      enum queue_stop_reason reason)
 439 {
 440         struct ieee80211_local *local = hw_to_local(hw);
 441         unsigned long flags;
 442         int i;
 443
 444         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 445
 446         for (i = 0; i < hw->queues; i++)
 447                 __ieee80211_wake_queue(hw, i, reason);
 448
 449         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 450 }
 451
 452 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 453 {
 454         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 455 }
 456 EXPORT_SYMBOL(ieee80211_wake_queues);
 457
 458 void ieee80211_iterate_active_interfaces(
 459         struct ieee80211_hw *hw,
 460         void (*iterator)(void *data, u8 *mac,
 461                          struct ieee80211_vif *vif),
 462         void *data)
 463 {
 464         struct ieee80211_local *local = hw_to_local(hw);
 465         struct ieee80211_sub_if_data *sdata;
 466
 467         mutex_lock(&local->iflist_mtx);
 468
 469         list_for_each_entry(sdata, &local->interfaces, list) {
 470                 switch (sdata->vif.type) {
 471                 case __NL80211_IFTYPE_AFTER_LAST:
 472                 case NL80211_IFTYPE_UNSPECIFIED:
 473                 case NL80211_IFTYPE_MONITOR:
 474                 case NL80211_IFTYPE_AP_VLAN:
 475                         continue;
 476                 case NL80211_IFTYPE_AP:
 477                 case NL80211_IFTYPE_STATION:
 478                 case NL80211_IFTYPE_ADHOC:
 479                 case NL80211_IFTYPE_WDS:
 480                 case NL80211_IFTYPE_MESH_POINT:
 481                         break;
 482                 }
 483                 if (netif_running(sdata->dev))
 484                         iterator(data, sdata->dev->dev_addr,
 485                                  &sdata->vif);
 486         }
 487
 488         mutex_unlock(&local->iflist_mtx);
 489 }
 490 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 491
 492 void ieee80211_iterate_active_interfaces_atomic(
 493         struct ieee80211_hw *hw,
 494         void (*iterator)(void *data, u8 *mac,
 495                          struct ieee80211_vif *vif),
 496         void *data)
 497 {
 498         struct ieee80211_local *local = hw_to_local(hw);
 499         struct ieee80211_sub_if_data *sdata;
 500
 501         rcu_read_lock();
 502
 503         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 504                 switch (sdata->vif.type) {
 505                 case __NL80211_IFTYPE_AFTER_LAST:
 506                 case NL80211_IFTYPE_UNSPECIFIED:
 507                 case NL80211_IFTYPE_MONITOR:
 508                 case NL80211_IFTYPE_AP_VLAN:
 509                         continue;
 510                 case NL80211_IFTYPE_AP:
 511                 case NL80211_IFTYPE_STATION:
 512                 case NL80211_IFTYPE_ADHOC:
 513                 case NL80211_IFTYPE_WDS:
 514                 case NL80211_IFTYPE_MESH_POINT:
 515                         break;
 516                 }
 517                 if (netif_running(sdata->dev))
 518                         iterator(data, sdata->dev->dev_addr,
 519                                  &sdata->vif);
 520         }
 521
 522         rcu_read_unlock();
 523 }
 524 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 525
 526 /*
 527  * Nothing should have been stuffed into the workqueue during
 528  * the suspend->resume cycle. If this WARN is seen then there
 529  * is a bug with either the driver suspend or something in
 530  * mac80211 stuffing into the workqueue which we haven't yet
 531  * cleared during mac80211's suspend cycle.
 532  */
 533 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 534 {
 535         if (WARN(local->suspended && !local->resuming,
 536                  "queueing ieee80211 work while going to suspend\n"))
 537                 return false;
 538
 539         return true;
 540 }
 541
 542 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 543 {
 544         struct ieee80211_local *local = hw_to_local(hw);
 545
 546         if (!ieee80211_can_queue_work(local))
 547                 return;
 548
 549         queue_work(local->workqueue, work);
 550 }
 551 EXPORT_SYMBOL(ieee80211_queue_work);
 552
 553 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 554                                   struct delayed_work *dwork,
 555                                   unsigned long delay)
 556 {
 557         struct ieee80211_local *local = hw_to_local(hw);
 558
 559         if (!ieee80211_can_queue_work(local))
 560                 return;
 561
 562         queue_delayed_work(local->workqueue, dwork, delay);
 563 }
 564 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 565
 566 void ieee802_11_parse_elems(u8 *start, size_t len,
 567                             struct ieee802_11_elems *elems)
 568 {
 569         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 570 }
 571
 572 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 573                                struct ieee802_11_elems *elems,
 574                                u64 filter, u32 crc)
 575 {
 576         size_t left = len;
 577         u8 *pos = start;
 578         bool calc_crc = filter != 0;
 579
 580         memset(elems, 0, sizeof(*elems));
 581         elems->ie_start = start;
 582         elems->total_len = len;
 583
 584         while (left >= 2) {
 585                 u8 id, elen;
 586
 587                 id = *pos++;
 588                 elen = *pos++;
 589                 left -= 2;
 590
 591                 if (elen > left)
 592                         break;
 593
 594                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
 595                         crc = crc32_be(crc, pos - 2, elen + 2);
 596
 597                 switch (id) {
 598                 case WLAN_EID_SSID:
 599                         elems->ssid = pos;
 600                         elems->ssid_len = elen;
 601                         break;
 602                 case WLAN_EID_SUPP_RATES:
 603                         elems->supp_rates = pos;
 604                         elems->supp_rates_len = elen;
 605                         break;
 606                 case WLAN_EID_FH_PARAMS:
 607                         elems->fh_params = pos;
 608                         elems->fh_params_len = elen;
 609                         break;
 610                 case WLAN_EID_DS_PARAMS:
 611                         elems->ds_params = pos;
 612                         elems->ds_params_len = elen;
 613                         break;
 614                 case WLAN_EID_CF_PARAMS:
 615                         elems->cf_params = pos;
 616                         elems->cf_params_len = elen;
 617                         break;
 618                 case WLAN_EID_TIM:
 619                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 620                                 elems->tim = (void *)pos;
 621                                 elems->tim_len = elen;
 622                         }
 623                         break;
 624                 case WLAN_EID_IBSS_PARAMS:
 625                         elems->ibss_params = pos;
 626                         elems->ibss_params_len = elen;
 627                         break;
 628                 case WLAN_EID_CHALLENGE:
 629                         elems->challenge = pos;
 630                         elems->challenge_len = elen;
 631                         break;
 632                 case WLAN_EID_VENDOR_SPECIFIC:
 633                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 634                             pos[2] == 0xf2) {
 635                                 /* Microsoft OUI (00:50:F2) */
 636
 637                                 if (calc_crc)
 638                                         crc = crc32_be(crc, pos - 2, elen + 2);
 639
 640                                 if (pos[3] == 1) {
 641                                         /* OUI Type 1 - WPA IE */
 642                                         elems->wpa = pos;
 643                                         elems->wpa_len = elen;
 644                                 } else if (elen >= 5 && pos[3] == 2) {
 645                                         /* OUI Type 2 - WMM IE */
 646                                         if (pos[4] == 0) {
 647                                                 elems->wmm_info = pos;
 648                                                 elems->wmm_info_len = elen;
 649                                         } else if (pos[4] == 1) {
 650                                                 elems->wmm_param = pos;
 651                                                 elems->wmm_param_len = elen;
 652                                         }
 653                                 }
 654                         }
 655                         break;
 656                 case WLAN_EID_RSN:
 657                         elems->rsn = pos;
 658                         elems->rsn_len = elen;
 659                         break;
 660                 case WLAN_EID_ERP_INFO:
 661                         elems->erp_info = pos;
 662                         elems->erp_info_len = elen;
 663                         break;
 664                 case WLAN_EID_EXT_SUPP_RATES:
 665                         elems->ext_supp_rates = pos;
 666                         elems->ext_supp_rates_len = elen;
 667                         break;
 668                 case WLAN_EID_HT_CAPABILITY:
 669                         if (elen >= sizeof(struct ieee80211_ht_cap))
 670                                 elems->ht_cap_elem = (void *)pos;
 671                         break;
 672                 case WLAN_EID_HT_INFORMATION:
 673                         if (elen >= sizeof(struct ieee80211_ht_info))
 674                                 elems->ht_info_elem = (void *)pos;
 675                         break;
 676                 case WLAN_EID_MESH_ID:
 677                         elems->mesh_id = pos;
 678                         elems->mesh_id_len = elen;
 679                         break;
 680                 case WLAN_EID_MESH_CONFIG:
 681                         elems->mesh_config = pos;
 682                         elems->mesh_config_len = elen;
 683                         break;
 684                 case WLAN_EID_PEER_LINK:
 685                         elems->peer_link = pos;
 686                         elems->peer_link_len = elen;
 687                         break;
 688                 case WLAN_EID_PREQ:
 689                         elems->preq = pos;
 690                         elems->preq_len = elen;
 691                         break;
 692                 case WLAN_EID_PREP:
 693                         elems->prep = pos;
 694                         elems->prep_len = elen;
 695                         break;
 696                 case WLAN_EID_PERR:
 697                         elems->perr = pos;
 698                         elems->perr_len = elen;
 699                         break;
 700                 case WLAN_EID_CHANNEL_SWITCH:
 701                         elems->ch_switch_elem = pos;
 702                         elems->ch_switch_elem_len = elen;
 703                         break;
 704                 case WLAN_EID_QUIET:
 705                         if (!elems->quiet_elem) {
 706                                 elems->quiet_elem = pos;
 707                                 elems->quiet_elem_len = elen;
 708                         }
 709                         elems->num_of_quiet_elem++;
 710                         break;
 711                 case WLAN_EID_COUNTRY:
 712                         elems->country_elem = pos;
 713                         elems->country_elem_len = elen;
 714                         break;
 715                 case WLAN_EID_PWR_CONSTRAINT:
 716                         elems->pwr_constr_elem = pos;
 717                         elems->pwr_constr_elem_len = elen;
 718                         break;
 719                 case WLAN_EID_TIMEOUT_INTERVAL:
 720                         elems->timeout_int = pos;
 721                         elems->timeout_int_len = elen;
 722                         break;
 723                 default:
 724                         break;
 725                 }
 726
 727                 left -= elen;
 728                 pos += elen;
 729         }
 730
 731         return crc;
 732 }
 733
 734 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 735 {
 736         struct ieee80211_local *local = sdata->local;
 737         struct ieee80211_tx_queue_params qparam;
 738         int queue;
 739         bool use_11b;
 740         int aCWmin, aCWmax;
 741
 742         if (!local->ops->conf_tx)
 743                 return;
 744
 745         memset(&qparam, 0, sizeof(qparam));
 746
 747         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 748                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 749
 750         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 751                 /* Set defaults according to 802.11-2007 Table 7-37 */
 752                 aCWmax = 1023;
 753                 if (use_11b)
 754                         aCWmin = 31;
 755                 else
 756                         aCWmin = 15;
 757
 758                 switch (queue) {
 759                 case 3: /* AC_BK */
 760                         qparam.cw_max = aCWmax;
 761                         qparam.cw_min = aCWmin;
 762                         qparam.txop = 0;
 763                         qparam.aifs = 7;
 764                         break;
 765                 default: /* never happens but let's not leave undefined */
 766                 case 2: /* AC_BE */
 767                         qparam.cw_max = aCWmax;
 768                         qparam.cw_min = aCWmin;
 769                         qparam.txop = 0;
 770                         qparam.aifs = 3;
 771                         break;
 772                 case 1: /* AC_VI */
 773                         qparam.cw_max = aCWmin;
 774                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 775                         if (use_11b)
 776                                 qparam.txop = 6016/32;
 777                         else
 778                                 qparam.txop = 3008/32;
 779                         qparam.aifs = 2;
 780                         break;
 781                 case 0: /* AC_VO */
 782                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 783                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 784                         if (use_11b)
 785                                 qparam.txop = 3264/32;
 786                         else
 787                                 qparam.txop = 1504/32;
 788                         qparam.aifs = 2;
 789                         break;
 790                 }
 791
 792                 drv_conf_tx(local, queue, &qparam);
 793         }
 794 }
 795
 796 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 797                                   const size_t supp_rates_len,
 798                                   const u8 *supp_rates)
 799 {
 800         struct ieee80211_local *local = sdata->local;
 801         int i, have_higher_than_11mbit = 0;
 802
 803         /* cf. IEEE 802.11 9.2.12 */
 804         for (i = 0; i < supp_rates_len; i++)
 805                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 806                         have_higher_than_11mbit = 1;
 807
 808         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 809             have_higher_than_11mbit)
 810                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 811         else
 812                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 813
 814         ieee80211_set_wmm_default(sdata);
 815 }
 816
 817 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 818                               enum ieee80211_band band)
 819 {
 820         struct ieee80211_supported_band *sband;
 821         struct ieee80211_rate *bitrates;
 822         u32 mandatory_rates;
 823         enum ieee80211_rate_flags mandatory_flag;
 824         int i;
 825
 826         sband = local->hw.wiphy->bands[band];
 827         if (!sband) {
 828                 WARN_ON(1);
 829                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 830         }
 831
 832         if (band == IEEE80211_BAND_2GHZ)
 833                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 834         else
 835                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 836
 837         bitrates = sband->bitrates;
 838         mandatory_rates = 0;
 839         for (i = 0; i < sband->n_bitrates; i++)
 840                 if (bitrates[i].flags & mandatory_flag)
 841                         mandatory_rates |= BIT(i);
 842         return mandatory_rates;
 843 }
 844
 845 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 846                          u16 transaction, u16 auth_alg,
 847                          u8 *extra, size_t extra_len, const u8 *bssid,
 848                          const u8 *key, u8 key_len, u8 key_idx)
 849 {
 850         struct ieee80211_local *local = sdata->local;
 851         struct sk_buff *skb;
 852         struct ieee80211_mgmt *mgmt;
 853         int err;
 854
 855         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 856                             sizeof(*mgmt) + 6 + extra_len);
 857         if (!skb) {
 858                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 859                        "frame\n", sdata->dev->name);
 860                 return;
 861         }
 862         skb_reserve(skb, local->hw.extra_tx_headroom);
 863
 864         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 865         memset(mgmt, 0, 24 + 6);
 866         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 867                                           IEEE80211_STYPE_AUTH);
 868         memcpy(mgmt->da, bssid, ETH_ALEN);
 869         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 870         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 871         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 872         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 873         mgmt->u.auth.status_code = cpu_to_le16(0);
 874         if (extra)
 875                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 876
 877         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 878                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 879                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 880                 WARN_ON(err);
 881         }
 882
 883         ieee80211_tx_skb(sdata, skb, 0);
 884 }
 885
 886 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 887                              const u8 *ie, size_t ie_len)
 888 {
 889         struct ieee80211_supported_band *sband;
 890         u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
 891         int i;
 892
 893         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 894
 895         pos = buffer;
 896
 897         *pos++ = WLAN_EID_SUPP_RATES;
 898         supp_rates_len = pos;
 899         *pos++ = 0;
 900
 901         for (i = 0; i < sband->n_bitrates; i++) {
 902                 struct ieee80211_rate *rate = &sband->bitrates[i];
 903
 904                 if (esupp_rates_len) {
 905                         *esupp_rates_len += 1;
 906                 } else if (*supp_rates_len == 8) {
 907                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
 908                         esupp_rates_len = pos;
 909                         *pos++ = 1;
 910                 } else
 911                         *supp_rates_len += 1;
 912
 913                 *pos++ = rate->bitrate / 5;
 914         }
 915
 916         if (sband->ht_cap.ht_supported) {
 917                 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
 918
 919                 *pos++ = WLAN_EID_HT_CAPABILITY;
 920                 *pos++ = sizeof(struct ieee80211_ht_cap);
 921                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 922                 memcpy(pos, &tmp, sizeof(u16));
 923                 pos += sizeof(u16);
 924                 /* TODO: needs a define here for << 2 */
 925                 *pos++ = sband->ht_cap.ampdu_factor |
 926                          (sband->ht_cap.ampdu_density << 2);
 927                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 928                 pos += sizeof(sband->ht_cap.mcs);
 929                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 930         }
 931
 932         /*
 933          * If adding more here, adjust code in main.c
 934          * that calculates local->scan_ies_len.
 935          */
 936
 937         if (ie) {
 938                 memcpy(pos, ie, ie_len);
 939                 pos += ie_len;
 940         }
 941
 942         return pos - buffer;
 943 }
 944
 945 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 946                               const u8 *ssid, size_t ssid_len,
 947                               const u8 *ie, size_t ie_len)
 948 {
 949         struct ieee80211_local *local = sdata->local;
 950         struct sk_buff *skb;
 951         struct ieee80211_mgmt *mgmt;
 952         u8 *pos;
 953
 954         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 955                             ie_len);
 956         if (!skb) {
 957                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 958                        "request\n", sdata->dev->name);
 959                 return;
 960         }
 961         skb_reserve(skb, local->hw.extra_tx_headroom);
 962
 963         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 964         memset(mgmt, 0, 24);
 965         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 966                                           IEEE80211_STYPE_PROBE_REQ);
 967         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 968         if (dst) {
 969                 memcpy(mgmt->da, dst, ETH_ALEN);
 970                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 971         } else {
 972                 memset(mgmt->da, 0xff, ETH_ALEN);
 973                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 974         }
 975         pos = skb_put(skb, 2 + ssid_len);
 976         *pos++ = WLAN_EID_SSID;
 977         *pos++ = ssid_len;
 978         memcpy(pos, ssid, ssid_len);
 979         pos += ssid_len;
 980
 981         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
 982
 983         ieee80211_tx_skb(sdata, skb, 0);
 984 }
 985
 986 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 987                             struct ieee802_11_elems *elems,
 988                             enum ieee80211_band band)
 989 {
 990         struct ieee80211_supported_band *sband;
 991         struct ieee80211_rate *bitrates;
 992         size_t num_rates;
 993         u32 supp_rates;
 994         int i, j;
 995         sband = local->hw.wiphy->bands[band];
 996
 997         if (!sband) {
 998                 WARN_ON(1);
 999                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1000         }
1001
1002         bitrates = sband->bitrates;
1003         num_rates = sband->n_bitrates;
1004         supp_rates = 0;
1005         for (i = 0; i < elems->supp_rates_len +
1006                      elems->ext_supp_rates_len; i++) {
1007                 u8 rate = 0;
1008                 int own_rate;
1009                 if (i < elems->supp_rates_len)
1010                         rate = elems->supp_rates[i];
1011                 else if (elems->ext_supp_rates)
1012                         rate = elems->ext_supp_rates
1013                                 [i - elems->supp_rates_len];
1014                 own_rate = 5 * (rate & 0x7f);
1015                 for (j = 0; j < num_rates; j++)
1016                         if (bitrates[j].bitrate == own_rate)
1017                                 supp_rates |= BIT(j);
1018         }
1019         return supp_rates;
1020 }
1021
1022 void ieee80211_stop_device(struct ieee80211_local *local)
1023 {
1024         ieee80211_led_radio(local, false);
1025
1026         cancel_work_sync(&local->reconfig_filter);
1027         drv_stop(local);
1028
1029         flush_workqueue(local->workqueue);
1030 }
1031
1032 int ieee80211_reconfig(struct ieee80211_local *local)
1033 {
1034         struct ieee80211_hw *hw = &local->hw;
1035         struct ieee80211_sub_if_data *sdata;
1036         struct ieee80211_if_init_conf conf;
1037         struct sta_info *sta;
1038         unsigned long flags;
1039         int res;
1040
1041         if (local->suspended)
1042                 local->resuming = true;
1043
1044         /* restart hardware */
1045         if (local->open_count) {
1046                 /*
1047                  * Upon resume hardware can sometimes be goofy due to
1048                  * various platform / driver / bus issues, so restarting
1049                  * the device may at times not work immediately. Propagate
1050                  * the error.
1051                  */
1052                 res = drv_start(local);
1053                 if (res) {
1054                         WARN(local->suspended, "Harware became unavailable "
1055                              "upon resume. This is could be a software issue"
1056                              "prior to suspend or a harware issue\n");
1057                         return res;
1058                 }
1059
1060                 ieee80211_led_radio(local, true);
1061         }
1062
1063         /* add interfaces */
1064         list_for_each_entry(sdata, &local->interfaces, list) {
1065                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1066                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1067                     netif_running(sdata->dev)) {
1068                         conf.vif = &sdata->vif;
1069                         conf.type = sdata->vif.type;
1070                         conf.mac_addr = sdata->dev->dev_addr;
1071                         res = drv_add_interface(local, &conf);
1072                 }
1073         }
1074
1075         /* add STAs back */
1076         if (local->ops->sta_notify) {
1077                 spin_lock_irqsave(&local->sta_lock, flags);
1078                 list_for_each_entry(sta, &local->sta_list, list) {
1079                         sdata = sta->sdata;
1080                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1081                                 sdata = container_of(sdata->bss,
1082                                              struct ieee80211_sub_if_data,
1083                                              u.ap);
1084
1085                         drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1086                                        &sta->sta);
1087                 }
1088                 spin_unlock_irqrestore(&local->sta_lock, flags);
1089         }
1090
1091         /* Clear Suspend state so that ADDBA requests can be processed */
1092
1093         rcu_read_lock();
1094
1095         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1096                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1097                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1098                 }
1099         }
1100
1101         rcu_read_unlock();
1102
1103         /* setup RTS threshold */
1104         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1105
1106         /* reconfigure hardware */
1107         ieee80211_hw_config(local, ~0);
1108
1109         ieee80211_configure_filter(local);
1110
1111         /* Finally also reconfigure all the BSS information */
1112         list_for_each_entry(sdata, &local->interfaces, list) {
1113                 u32 changed = ~0;
1114                 if (!netif_running(sdata->dev))
1115                         continue;
1116                 switch (sdata->vif.type) {
1117                 case NL80211_IFTYPE_STATION:
1118                         /* disable beacon change bits */
1119                         changed &= ~(BSS_CHANGED_BEACON |
1120                                      BSS_CHANGED_BEACON_ENABLED);
1121                         /* fall through */
1122                 case NL80211_IFTYPE_ADHOC:
1123                 case NL80211_IFTYPE_AP:
1124                 case NL80211_IFTYPE_MESH_POINT:
1125                         ieee80211_bss_info_change_notify(sdata, changed);
1126                         break;
1127                 case NL80211_IFTYPE_WDS:
1128                         break;
1129                 case NL80211_IFTYPE_AP_VLAN:
1130                 case NL80211_IFTYPE_MONITOR:
1131                         /* ignore virtual */
1132                         break;
1133                 case NL80211_IFTYPE_UNSPECIFIED:
1134                 case __NL80211_IFTYPE_AFTER_LAST:
1135                         WARN_ON(1);
1136                         break;
1137                 }
1138         }
1139
1140         rcu_read_lock();
1141         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1142                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1143                         ieee80211_sta_tear_down_BA_sessions(sta);
1144                 }
1145         }
1146         rcu_read_unlock();
1147
1148         /* add back keys */
1149         list_for_each_entry(sdata, &local->interfaces, list)
1150                 if (netif_running(sdata->dev))
1151                         ieee80211_enable_keys(sdata);
1152
1153         ieee80211_wake_queues_by_reason(hw,
1154                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1155
1156         /*
1157          * If this is for hw restart things are still running.
1158          * We may want to change that later, however.
1159          */
1160         if (!local->suspended)
1161                 return 0;
1162
1163 #ifdef CONFIG_PM
1164         /* first set suspended false, then resuming */
1165         local->suspended = false;
1166         mb();
1167         local->resuming = false;
1168
1169         list_for_each_entry(sdata, &local->interfaces, list) {
1170                 switch(sdata->vif.type) {
1171                 case NL80211_IFTYPE_STATION:
1172                         ieee80211_sta_restart(sdata);
1173                         break;
1174                 case NL80211_IFTYPE_ADHOC:
1175                         ieee80211_ibss_restart(sdata);
1176                         break;
1177                 case NL80211_IFTYPE_MESH_POINT:
1178                         ieee80211_mesh_restart(sdata);
1179                         break;
1180                 default:
1181                         break;
1182                 }
1183         }
1184
1185         add_timer(&local->sta_cleanup);
1186
1187         spin_lock_irqsave(&local->sta_lock, flags);
1188         list_for_each_entry(sta, &local->sta_list, list)
1189                 mesh_plink_restart(sta);
1190         spin_unlock_irqrestore(&local->sta_lock, flags);
1191 #else
1192         WARN_ON(1);
1193 #endif
1194         return 0;
1195 }
1196