Pileus Git - ~andy/linux/blob - 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
 273         if (WARN_ON(queue >= hw->queues))
 274                 return;
 275
 276         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 277
 278         if (local->queue_stop_reasons[queue] != 0)
 279                 /* someone still has this queue stopped */
 280                 return;
 281
 282         if (!skb_queue_empty(&local->pending[queue]))
 283                 tasklet_schedule(&local->tx_pending_tasklet);
 284 }
 285
 286 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 287                                     enum queue_stop_reason reason)
 288 {
 289         struct ieee80211_local *local = hw_to_local(hw);
 290         unsigned long flags;
 291
 292         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 293         __ieee80211_wake_queue(hw, queue, reason);
 294         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 295 }
 296
 297 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 298 {
 299         ieee80211_wake_queue_by_reason(hw, queue,
 300                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 301 }
 302 EXPORT_SYMBOL(ieee80211_wake_queue);
 303
 304 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 305                                    enum queue_stop_reason reason)
 306 {
 307         struct ieee80211_local *local = hw_to_local(hw);
 308
 309         if (WARN_ON(queue >= hw->queues))
 310                 return;
 311
 312         __set_bit(reason, &local->queue_stop_reasons[queue]);
 313 }
 314
 315 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 316                                     enum queue_stop_reason reason)
 317 {
 318         struct ieee80211_local *local = hw_to_local(hw);
 319         unsigned long flags;
 320
 321         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 322         __ieee80211_stop_queue(hw, queue, reason);
 323         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 324 }
 325
 326 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 327 {
 328         ieee80211_stop_queue_by_reason(hw, queue,
 329                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 330 }
 331 EXPORT_SYMBOL(ieee80211_stop_queue);
 332
 333 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 334                                struct sk_buff *skb)
 335 {
 336         struct ieee80211_hw *hw = &local->hw;
 337         unsigned long flags;
 338         int queue = skb_get_queue_mapping(skb);
 339
 340         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 341         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 342         __skb_queue_tail(&local->pending[queue], skb);
 343         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 344         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 345 }
 346
 347 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 348                                struct sk_buff_head *skbs)
 349 {
 350         struct ieee80211_hw *hw = &local->hw;
 351         struct sk_buff *skb;
 352         unsigned long flags;
 353         int queue, ret = 0, i;
 354
 355         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 356         for (i = 0; i < hw->queues; i++)
 357                 __ieee80211_stop_queue(hw, i,
 358                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 359
 360         while ((skb = skb_dequeue(skbs))) {
 361                 ret++;
 362                 queue = skb_get_queue_mapping(skb);
 363                 __skb_queue_tail(&local->pending[queue], skb);
 364         }
 365
 366         for (i = 0; i < hw->queues; i++)
 367                 __ieee80211_wake_queue(hw, i,
 368                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 369         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 370
 371         return ret;
 372 }
 373
 374 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 375                                     enum queue_stop_reason reason)
 376 {
 377         struct ieee80211_local *local = hw_to_local(hw);
 378         unsigned long flags;
 379         int i;
 380
 381         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 382
 383         for (i = 0; i < hw->queues; i++)
 384                 __ieee80211_stop_queue(hw, i, reason);
 385
 386         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 387 }
 388
 389 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 390 {
 391         ieee80211_stop_queues_by_reason(hw,
 392                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 393 }
 394 EXPORT_SYMBOL(ieee80211_stop_queues);
 395
 396 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 397 {
 398         struct ieee80211_local *local = hw_to_local(hw);
 399         unsigned long flags;
 400         int ret;
 401
 402         if (WARN_ON(queue >= hw->queues))
 403                 return true;
 404
 405         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 406         ret = !!local->queue_stop_reasons[queue];
 407         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 408         return ret;
 409 }
 410 EXPORT_SYMBOL(ieee80211_queue_stopped);
 411
 412 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 413                                      enum queue_stop_reason reason)
 414 {
 415         struct ieee80211_local *local = hw_to_local(hw);
 416         unsigned long flags;
 417         int i;
 418
 419         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 420
 421         for (i = 0; i < hw->queues; i++)
 422                 __ieee80211_wake_queue(hw, i, reason);
 423
 424         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 425 }
 426
 427 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 428 {
 429         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 430 }
 431 EXPORT_SYMBOL(ieee80211_wake_queues);
 432
 433 void ieee80211_iterate_active_interfaces(
 434         struct ieee80211_hw *hw,
 435         void (*iterator)(void *data, u8 *mac,
 436                          struct ieee80211_vif *vif),
 437         void *data)
 438 {
 439         struct ieee80211_local *local = hw_to_local(hw);
 440         struct ieee80211_sub_if_data *sdata;
 441
 442         mutex_lock(&local->iflist_mtx);
 443
 444         list_for_each_entry(sdata, &local->interfaces, list) {
 445                 switch (sdata->vif.type) {
 446                 case __NL80211_IFTYPE_AFTER_LAST:
 447                 case NL80211_IFTYPE_UNSPECIFIED:
 448                 case NL80211_IFTYPE_MONITOR:
 449                 case NL80211_IFTYPE_AP_VLAN:
 450                         continue;
 451                 case NL80211_IFTYPE_AP:
 452                 case NL80211_IFTYPE_STATION:
 453                 case NL80211_IFTYPE_ADHOC:
 454                 case NL80211_IFTYPE_WDS:
 455                 case NL80211_IFTYPE_MESH_POINT:
 456                         break;
 457                 }
 458                 if (netif_running(sdata->dev))
 459                         iterator(data, sdata->dev->dev_addr,
 460                                  &sdata->vif);
 461         }
 462
 463         mutex_unlock(&local->iflist_mtx);
 464 }
 465 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 466
 467 void ieee80211_iterate_active_interfaces_atomic(
 468         struct ieee80211_hw *hw,
 469         void (*iterator)(void *data, u8 *mac,
 470                          struct ieee80211_vif *vif),
 471         void *data)
 472 {
 473         struct ieee80211_local *local = hw_to_local(hw);
 474         struct ieee80211_sub_if_data *sdata;
 475
 476         rcu_read_lock();
 477
 478         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 479                 switch (sdata->vif.type) {
 480                 case __NL80211_IFTYPE_AFTER_LAST:
 481                 case NL80211_IFTYPE_UNSPECIFIED:
 482                 case NL80211_IFTYPE_MONITOR:
 483                 case NL80211_IFTYPE_AP_VLAN:
 484                         continue;
 485                 case NL80211_IFTYPE_AP:
 486                 case NL80211_IFTYPE_STATION:
 487                 case NL80211_IFTYPE_ADHOC:
 488                 case NL80211_IFTYPE_WDS:
 489                 case NL80211_IFTYPE_MESH_POINT:
 490                         break;
 491                 }
 492                 if (netif_running(sdata->dev))
 493                         iterator(data, sdata->dev->dev_addr,
 494                                  &sdata->vif);
 495         }
 496
 497         rcu_read_unlock();
 498 }
 499 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 500
 501 void ieee802_11_parse_elems(u8 *start, size_t len,
 502                             struct ieee802_11_elems *elems)
 503 {
 504         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 505 }
 506
 507 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 508                                struct ieee802_11_elems *elems,
 509                                u64 filter, u32 crc)
 510 {
 511         size_t left = len;
 512         u8 *pos = start;
 513         bool calc_crc = filter != 0;
 514
 515         memset(elems, 0, sizeof(*elems));
 516         elems->ie_start = start;
 517         elems->total_len = len;
 518
 519         while (left >= 2) {
 520                 u8 id, elen;
 521
 522                 id = *pos++;
 523                 elen = *pos++;
 524                 left -= 2;
 525
 526                 if (elen > left)
 527                         break;
 528
 529                 if (calc_crc && id < 64 && (filter & BIT(id)))
 530                         crc = crc32_be(crc, pos - 2, elen + 2);
 531
 532                 switch (id) {
 533                 case WLAN_EID_SSID:
 534                         elems->ssid = pos;
 535                         elems->ssid_len = elen;
 536                         break;
 537                 case WLAN_EID_SUPP_RATES:
 538                         elems->supp_rates = pos;
 539                         elems->supp_rates_len = elen;
 540                         break;
 541                 case WLAN_EID_FH_PARAMS:
 542                         elems->fh_params = pos;
 543                         elems->fh_params_len = elen;
 544                         break;
 545                 case WLAN_EID_DS_PARAMS:
 546                         elems->ds_params = pos;
 547                         elems->ds_params_len = elen;
 548                         break;
 549                 case WLAN_EID_CF_PARAMS:
 550                         elems->cf_params = pos;
 551                         elems->cf_params_len = elen;
 552                         break;
 553                 case WLAN_EID_TIM:
 554                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 555                                 elems->tim = (void *)pos;
 556                                 elems->tim_len = elen;
 557                         }
 558                         break;
 559                 case WLAN_EID_IBSS_PARAMS:
 560                         elems->ibss_params = pos;
 561                         elems->ibss_params_len = elen;
 562                         break;
 563                 case WLAN_EID_CHALLENGE:
 564                         elems->challenge = pos;
 565                         elems->challenge_len = elen;
 566                         break;
 567                 case WLAN_EID_VENDOR_SPECIFIC:
 568                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 569                             pos[2] == 0xf2) {
 570                                 /* Microsoft OUI (00:50:F2) */
 571
 572                                 if (calc_crc)
 573                                         crc = crc32_be(crc, pos - 2, elen + 2);
 574
 575                                 if (pos[3] == 1) {
 576                                         /* OUI Type 1 - WPA IE */
 577                                         elems->wpa = pos;
 578                                         elems->wpa_len = elen;
 579                                 } else if (elen >= 5 && pos[3] == 2) {
 580                                         /* OUI Type 2 - WMM IE */
 581                                         if (pos[4] == 0) {
 582                                                 elems->wmm_info = pos;
 583                                                 elems->wmm_info_len = elen;
 584                                         } else if (pos[4] == 1) {
 585                                                 elems->wmm_param = pos;
 586                                                 elems->wmm_param_len = elen;
 587                                         }
 588                                 }
 589                         }
 590                         break;
 591                 case WLAN_EID_RSN:
 592                         elems->rsn = pos;
 593                         elems->rsn_len = elen;
 594                         break;
 595                 case WLAN_EID_ERP_INFO:
 596                         elems->erp_info = pos;
 597                         elems->erp_info_len = elen;
 598                         break;
 599                 case WLAN_EID_EXT_SUPP_RATES:
 600                         elems->ext_supp_rates = pos;
 601                         elems->ext_supp_rates_len = elen;
 602                         break;
 603                 case WLAN_EID_HT_CAPABILITY:
 604                         if (elen >= sizeof(struct ieee80211_ht_cap))
 605                                 elems->ht_cap_elem = (void *)pos;
 606                         break;
 607                 case WLAN_EID_HT_INFORMATION:
 608                         if (elen >= sizeof(struct ieee80211_ht_info))
 609                                 elems->ht_info_elem = (void *)pos;
 610                         break;
 611                 case WLAN_EID_MESH_ID:
 612                         elems->mesh_id = pos;
 613                         elems->mesh_id_len = elen;
 614                         break;
 615                 case WLAN_EID_MESH_CONFIG:
 616                         elems->mesh_config = pos;
 617                         elems->mesh_config_len = elen;
 618                         break;
 619                 case WLAN_EID_PEER_LINK:
 620                         elems->peer_link = pos;
 621                         elems->peer_link_len = elen;
 622                         break;
 623                 case WLAN_EID_PREQ:
 624                         elems->preq = pos;
 625                         elems->preq_len = elen;
 626                         break;
 627                 case WLAN_EID_PREP:
 628                         elems->prep = pos;
 629                         elems->prep_len = elen;
 630                         break;
 631                 case WLAN_EID_PERR:
 632                         elems->perr = pos;
 633                         elems->perr_len = elen;
 634                         break;
 635                 case WLAN_EID_CHANNEL_SWITCH:
 636                         elems->ch_switch_elem = pos;
 637                         elems->ch_switch_elem_len = elen;
 638                         break;
 639                 case WLAN_EID_QUIET:
 640                         if (!elems->quiet_elem) {
 641                                 elems->quiet_elem = pos;
 642                                 elems->quiet_elem_len = elen;
 643                         }
 644                         elems->num_of_quiet_elem++;
 645                         break;
 646                 case WLAN_EID_COUNTRY:
 647                         elems->country_elem = pos;
 648                         elems->country_elem_len = elen;
 649                         break;
 650                 case WLAN_EID_PWR_CONSTRAINT:
 651                         elems->pwr_constr_elem = pos;
 652                         elems->pwr_constr_elem_len = elen;
 653                         break;
 654                 case WLAN_EID_TIMEOUT_INTERVAL:
 655                         elems->timeout_int = pos;
 656                         elems->timeout_int_len = elen;
 657                         break;
 658                 default:
 659                         break;
 660                 }
 661
 662                 left -= elen;
 663                 pos += elen;
 664         }
 665
 666         return crc;
 667 }
 668
 669 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 670 {
 671         struct ieee80211_local *local = sdata->local;
 672         struct ieee80211_tx_queue_params qparam;
 673         int queue;
 674         bool use_11b;
 675         int aCWmin, aCWmax;
 676
 677         if (!local->ops->conf_tx)
 678                 return;
 679
 680         memset(&qparam, 0, sizeof(qparam));
 681
 682         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 683                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 684
 685         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 686                 /* Set defaults according to 802.11-2007 Table 7-37 */
 687                 aCWmax = 1023;
 688                 if (use_11b)
 689                         aCWmin = 31;
 690                 else
 691                         aCWmin = 15;
 692
 693                 switch (queue) {
 694                 case 3: /* AC_BK */
 695                         qparam.cw_max = aCWmax;
 696                         qparam.cw_min = aCWmin;
 697                         qparam.txop = 0;
 698                         qparam.aifs = 7;
 699                         break;
 700                 default: /* never happens but let's not leave undefined */
 701                 case 2: /* AC_BE */
 702                         qparam.cw_max = aCWmax;
 703                         qparam.cw_min = aCWmin;
 704                         qparam.txop = 0;
 705                         qparam.aifs = 3;
 706                         break;
 707                 case 1: /* AC_VI */
 708                         qparam.cw_max = aCWmin;
 709                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 710                         if (use_11b)
 711                                 qparam.txop = 6016/32;
 712                         else
 713                                 qparam.txop = 3008/32;
 714                         qparam.aifs = 2;
 715                         break;
 716                 case 0: /* AC_VO */
 717                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 718                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 719                         if (use_11b)
 720                                 qparam.txop = 3264/32;
 721                         else
 722                                 qparam.txop = 1504/32;
 723                         qparam.aifs = 2;
 724                         break;
 725                 }
 726
 727                 drv_conf_tx(local, queue, &qparam);
 728         }
 729 }
 730
 731 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 732                                   const size_t supp_rates_len,
 733                                   const u8 *supp_rates)
 734 {
 735         struct ieee80211_local *local = sdata->local;
 736         int i, have_higher_than_11mbit = 0;
 737
 738         /* cf. IEEE 802.11 9.2.12 */
 739         for (i = 0; i < supp_rates_len; i++)
 740                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 741                         have_higher_than_11mbit = 1;
 742
 743         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 744             have_higher_than_11mbit)
 745                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 746         else
 747                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 748
 749         ieee80211_set_wmm_default(sdata);
 750 }
 751
 752 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 753                               enum ieee80211_band band)
 754 {
 755         struct ieee80211_supported_band *sband;
 756         struct ieee80211_rate *bitrates;
 757         u32 mandatory_rates;
 758         enum ieee80211_rate_flags mandatory_flag;
 759         int i;
 760
 761         sband = local->hw.wiphy->bands[band];
 762         if (!sband) {
 763                 WARN_ON(1);
 764                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 765         }
 766
 767         if (band == IEEE80211_BAND_2GHZ)
 768                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 769         else
 770                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 771
 772         bitrates = sband->bitrates;
 773         mandatory_rates = 0;
 774         for (i = 0; i < sband->n_bitrates; i++)
 775                 if (bitrates[i].flags & mandatory_flag)
 776                         mandatory_rates |= BIT(i);
 777         return mandatory_rates;
 778 }
 779
 780 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 781                          u16 transaction, u16 auth_alg,
 782                          u8 *extra, size_t extra_len, const u8 *bssid,
 783                          const u8 *key, u8 key_len, u8 key_idx)
 784 {
 785         struct ieee80211_local *local = sdata->local;
 786         struct sk_buff *skb;
 787         struct ieee80211_mgmt *mgmt;
 788         int err;
 789
 790         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 791                             sizeof(*mgmt) + 6 + extra_len);
 792         if (!skb) {
 793                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 794                        "frame\n", sdata->dev->name);
 795                 return;
 796         }
 797         skb_reserve(skb, local->hw.extra_tx_headroom);
 798
 799         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 800         memset(mgmt, 0, 24 + 6);
 801         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 802                                           IEEE80211_STYPE_AUTH);
 803         memcpy(mgmt->da, bssid, ETH_ALEN);
 804         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 805         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 806         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 807         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 808         mgmt->u.auth.status_code = cpu_to_le16(0);
 809         if (extra)
 810                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 811
 812         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 813                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 814                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 815                 WARN_ON(err);
 816         }
 817
 818         ieee80211_tx_skb(sdata, skb, 0);
 819 }
 820
 821 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 822                              const u8 *ie, size_t ie_len)
 823 {
 824         struct ieee80211_supported_band *sband;
 825         u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
 826         int i;
 827
 828         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 829
 830         pos = buffer;
 831
 832         *pos++ = WLAN_EID_SUPP_RATES;
 833         supp_rates_len = pos;
 834         *pos++ = 0;
 835
 836         for (i = 0; i < sband->n_bitrates; i++) {
 837                 struct ieee80211_rate *rate = &sband->bitrates[i];
 838
 839                 if (esupp_rates_len) {
 840                         *esupp_rates_len += 1;
 841                 } else if (*supp_rates_len == 8) {
 842                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
 843                         esupp_rates_len = pos;
 844                         *pos++ = 1;
 845                 } else
 846                         *supp_rates_len += 1;
 847
 848                 *pos++ = rate->bitrate / 5;
 849         }
 850
 851         if (sband->ht_cap.ht_supported) {
 852                 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
 853
 854                 *pos++ = WLAN_EID_HT_CAPABILITY;
 855                 *pos++ = sizeof(struct ieee80211_ht_cap);
 856                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 857                 memcpy(pos, &tmp, sizeof(u16));
 858                 pos += sizeof(u16);
 859                 /* TODO: needs a define here for << 2 */
 860                 *pos++ = sband->ht_cap.ampdu_factor |
 861                          (sband->ht_cap.ampdu_density << 2);
 862                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 863                 pos += sizeof(sband->ht_cap.mcs);
 864                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 865         }
 866
 867         /*
 868          * If adding more here, adjust code in main.c
 869          * that calculates local->scan_ies_len.
 870          */
 871
 872         if (ie) {
 873                 memcpy(pos, ie, ie_len);
 874                 pos += ie_len;
 875         }
 876
 877         return pos - buffer;
 878 }
 879
 880 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 881                               const u8 *ssid, size_t ssid_len,
 882                               const u8 *ie, size_t ie_len)
 883 {
 884         struct ieee80211_local *local = sdata->local;
 885         struct sk_buff *skb;
 886         struct ieee80211_mgmt *mgmt;
 887         u8 *pos;
 888
 889         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 890                             ie_len);
 891         if (!skb) {
 892                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 893                        "request\n", sdata->dev->name);
 894                 return;
 895         }
 896         skb_reserve(skb, local->hw.extra_tx_headroom);
 897
 898         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 899         memset(mgmt, 0, 24);
 900         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 901                                           IEEE80211_STYPE_PROBE_REQ);
 902         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 903         if (dst) {
 904                 memcpy(mgmt->da, dst, ETH_ALEN);
 905                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 906         } else {
 907                 memset(mgmt->da, 0xff, ETH_ALEN);
 908                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 909         }
 910         pos = skb_put(skb, 2 + ssid_len);
 911         *pos++ = WLAN_EID_SSID;
 912         *pos++ = ssid_len;
 913         memcpy(pos, ssid, ssid_len);
 914         pos += ssid_len;
 915
 916         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
 917
 918         ieee80211_tx_skb(sdata, skb, 0);
 919 }
 920
 921 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 922                             struct ieee802_11_elems *elems,
 923                             enum ieee80211_band band)
 924 {
 925         struct ieee80211_supported_band *sband;
 926         struct ieee80211_rate *bitrates;
 927         size_t num_rates;
 928         u32 supp_rates;
 929         int i, j;
 930         sband = local->hw.wiphy->bands[band];
 931
 932         if (!sband) {
 933                 WARN_ON(1);
 934                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 935         }
 936
 937         bitrates = sband->bitrates;
 938         num_rates = sband->n_bitrates;
 939         supp_rates = 0;
 940         for (i = 0; i < elems->supp_rates_len +
 941                      elems->ext_supp_rates_len; i++) {
 942                 u8 rate = 0;
 943                 int own_rate;
 944                 if (i < elems->supp_rates_len)
 945                         rate = elems->supp_rates[i];
 946                 else if (elems->ext_supp_rates)
 947                         rate = elems->ext_supp_rates
 948                                 [i - elems->supp_rates_len];
 949                 own_rate = 5 * (rate & 0x7f);
 950                 for (j = 0; j < num_rates; j++)
 951                         if (bitrates[j].bitrate == own_rate)
 952                                 supp_rates |= BIT(j);
 953         }
 954         return supp_rates;
 955 }
 956
 957 int ieee80211_reconfig(struct ieee80211_local *local)
 958 {
 959         struct ieee80211_hw *hw = &local->hw;
 960         struct ieee80211_sub_if_data *sdata;
 961         struct ieee80211_if_init_conf conf;
 962         struct sta_info *sta;
 963         unsigned long flags;
 964         int res;
 965         bool from_suspend = local->suspended;
 966
 967         /*
 968          * We're going to start the hardware, at that point
 969          * we are no longer suspended and can RX frames.
 970          */
 971         local->suspended = false;
 972
 973         /* restart hardware */
 974         if (local->open_count) {
 975                 res = drv_start(local);
 976
 977                 ieee80211_led_radio(local, true);
 978         }
 979
 980         /* add interfaces */
 981         list_for_each_entry(sdata, &local->interfaces, list) {
 982                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 983                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 984                     netif_running(sdata->dev)) {
 985                         conf.vif = &sdata->vif;
 986                         conf.type = sdata->vif.type;
 987                         conf.mac_addr = sdata->dev->dev_addr;
 988                         res = drv_add_interface(local, &conf);
 989                 }
 990         }
 991
 992         /* add STAs back */
 993         if (local->ops->sta_notify) {
 994                 spin_lock_irqsave(&local->sta_lock, flags);
 995                 list_for_each_entry(sta, &local->sta_list, list) {
 996                         sdata = sta->sdata;
 997                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 998                                 sdata = container_of(sdata->bss,
 999                                              struct ieee80211_sub_if_data,
1000                                              u.ap);
1001
1002                         drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1003                                        &sta->sta);
1004                 }
1005                 spin_unlock_irqrestore(&local->sta_lock, flags);
1006         }
1007
1008         /* Clear Suspend state so that ADDBA requests can be processed */
1009
1010         rcu_read_lock();
1011
1012         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1013                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1014                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1015                 }
1016         }
1017
1018         rcu_read_unlock();
1019
1020         /* setup RTS threshold */
1021         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1022
1023         /* reconfigure hardware */
1024         ieee80211_hw_config(local, ~0);
1025
1026         spin_lock_bh(&local->filter_lock);
1027         ieee80211_configure_filter(local);
1028         spin_unlock_bh(&local->filter_lock);
1029
1030         /* Finally also reconfigure all the BSS information */
1031         list_for_each_entry(sdata, &local->interfaces, list) {
1032                 u32 changed = ~0;
1033                 if (!netif_running(sdata->dev))
1034                         continue;
1035                 switch (sdata->vif.type) {
1036                 case NL80211_IFTYPE_STATION:
1037                         /* disable beacon change bits */
1038                         changed &= ~(BSS_CHANGED_BEACON |
1039                                      BSS_CHANGED_BEACON_ENABLED);
1040                         /* fall through */
1041                 case NL80211_IFTYPE_ADHOC:
1042                 case NL80211_IFTYPE_AP:
1043                 case NL80211_IFTYPE_MESH_POINT:
1044                         ieee80211_bss_info_change_notify(sdata, changed);
1045                         break;
1046                 case NL80211_IFTYPE_WDS:
1047                         break;
1048                 case NL80211_IFTYPE_AP_VLAN:
1049                 case NL80211_IFTYPE_MONITOR:
1050                         /* ignore virtual */
1051                         break;
1052                 case NL80211_IFTYPE_UNSPECIFIED:
1053                 case __NL80211_IFTYPE_AFTER_LAST:
1054                         WARN_ON(1);
1055                         break;
1056                 }
1057         }
1058
1059         /* add back keys */
1060         list_for_each_entry(sdata, &local->interfaces, list)
1061                 if (netif_running(sdata->dev))
1062                         ieee80211_enable_keys(sdata);
1063
1064         ieee80211_wake_queues_by_reason(hw,
1065                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1066
1067         /*
1068          * If this is for hw restart things are still running.
1069          * We may want to change that later, however.
1070          */
1071         if (!from_suspend)
1072                 return 0;
1073
1074 #ifdef CONFIG_PM
1075         local->suspended = false;
1076
1077         list_for_each_entry(sdata, &local->interfaces, list) {
1078                 switch(sdata->vif.type) {
1079                 case NL80211_IFTYPE_STATION:
1080                         ieee80211_sta_restart(sdata);
1081                         break;
1082                 case NL80211_IFTYPE_ADHOC:
1083                         ieee80211_ibss_restart(sdata);
1084                         break;
1085                 case NL80211_IFTYPE_MESH_POINT:
1086                         ieee80211_mesh_restart(sdata);
1087                         break;
1088                 default:
1089                         break;
1090                 }
1091         }
1092
1093         add_timer(&local->sta_cleanup);
1094
1095         spin_lock_irqsave(&local->sta_lock, flags);
1096         list_for_each_entry(sta, &local->sta_list, list)
1097                 mesh_plink_restart(sta);
1098         spin_unlock_irqrestore(&local->sta_lock, flags);
1099 #else
1100         WARN_ON(1);
1101 #endif
1102         return 0;
1103 }