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
  35 /* privid for wiphys to determine whether they belong to us or not */
  36 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  37
  38 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  39 {
  40         struct ieee80211_local *local;
  41         BUG_ON(!wiphy);
  42
  43         local = wiphy_priv(wiphy);
  44         return &local->hw;
  45 }
  46 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  47
  48 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  49                         enum nl80211_iftype type)
  50 {
  51         __le16 fc = hdr->frame_control;
  52
  53          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  54         if (len < 16)
  55                 return NULL;
  56
  57         if (ieee80211_is_data(fc)) {
  58                 if (len < 24) /* drop incorrect hdr len (data) */
  59                         return NULL;
  60
  61                 if (ieee80211_has_a4(fc))
  62                         return NULL;
  63                 if (ieee80211_has_tods(fc))
  64                         return hdr->addr1;
  65                 if (ieee80211_has_fromds(fc))
  66                         return hdr->addr2;
  67
  68                 return hdr->addr3;
  69         }
  70
  71         if (ieee80211_is_mgmt(fc)) {
  72                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  73                         return NULL;
  74                 return hdr->addr3;
  75         }
  76
  77         if (ieee80211_is_ctl(fc)) {
  78                 if(ieee80211_is_pspoll(fc))
  79                         return hdr->addr1;
  80
  81                 if (ieee80211_is_back_req(fc)) {
  82                         switch (type) {
  83                         case NL80211_IFTYPE_STATION:
  84                                 return hdr->addr2;
  85                         case NL80211_IFTYPE_AP:
  86                         case NL80211_IFTYPE_AP_VLAN:
  87                                 return hdr->addr1;
  88                         default:
  89                                 break; /* fall through to the return */
  90                         }
  91                 }
  92         }
  93
  94         return NULL;
  95 }
  96
  97 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  98 {
  99         struct sk_buff *skb = tx->skb;
 100         struct ieee80211_hdr *hdr;
 101
 102         do {
 103                 hdr = (struct ieee80211_hdr *) skb->data;
 104                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 105         } while ((skb = skb->next));
 106 }
 107
 108 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 109                              int rate, int erp, int short_preamble)
 110 {
 111         int dur;
 112
 113         /* calculate duration (in microseconds, rounded up to next higher
 114          * integer if it includes a fractional microsecond) to send frame of
 115          * len bytes (does not include FCS) at the given rate. Duration will
 116          * also include SIFS.
 117          *
 118          * rate is in 100 kbps, so divident is multiplied by 10 in the
 119          * DIV_ROUND_UP() operations.
 120          */
 121
 122         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 123                 /*
 124                  * OFDM:
 125                  *
 126                  * N_DBPS = DATARATE x 4
 127                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 128                  *      (16 = SIGNAL time, 6 = tail bits)
 129                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 130                  *
 131                  * T_SYM = 4 usec
 132                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 133                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 134                  *      signal ext = 6 usec
 135                  */
 136                 dur = 16; /* SIFS + signal ext */
 137                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 138                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 139                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 140                                         4 * rate); /* T_SYM x N_SYM */
 141         } else {
 142                 /*
 143                  * 802.11b or 802.11g with 802.11b compatibility:
 144                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 145                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 146                  *
 147                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 148                  * aSIFSTime = 10 usec
 149                  * aPreambleLength = 144 usec or 72 usec with short preamble
 150                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 151                  */
 152                 dur = 10; /* aSIFSTime = 10 usec */
 153                 dur += short_preamble ? (72 + 24) : (144 + 48);
 154
 155                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 156         }
 157
 158         return dur;
 159 }
 160
 161 /* Exported duration function for driver use */
 162 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 163                                         struct ieee80211_vif *vif,
 164                                         size_t frame_len,
 165                                         struct ieee80211_rate *rate)
 166 {
 167         struct ieee80211_local *local = hw_to_local(hw);
 168         struct ieee80211_sub_if_data *sdata;
 169         u16 dur;
 170         int erp;
 171         bool short_preamble = false;
 172
 173         erp = 0;
 174         if (vif) {
 175                 sdata = vif_to_sdata(vif);
 176                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 177                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 178                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 179         }
 180
 181         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 182                                        short_preamble);
 183
 184         return cpu_to_le16(dur);
 185 }
 186 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 187
 188 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 189                               struct ieee80211_vif *vif, size_t frame_len,
 190                               const struct ieee80211_tx_info *frame_txctl)
 191 {
 192         struct ieee80211_local *local = hw_to_local(hw);
 193         struct ieee80211_rate *rate;
 194         struct ieee80211_sub_if_data *sdata;
 195         bool short_preamble;
 196         int erp;
 197         u16 dur;
 198         struct ieee80211_supported_band *sband;
 199
 200         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 201
 202         short_preamble = false;
 203
 204         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 205
 206         erp = 0;
 207         if (vif) {
 208                 sdata = vif_to_sdata(vif);
 209                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 210                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 211                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 212         }
 213
 214         /* CTS duration */
 215         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 216                                        erp, short_preamble);
 217         /* Data frame duration */
 218         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 219                                         erp, short_preamble);
 220         /* ACK duration */
 221         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 222                                         erp, short_preamble);
 223
 224         return cpu_to_le16(dur);
 225 }
 226 EXPORT_SYMBOL(ieee80211_rts_duration);
 227
 228 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 229                                     struct ieee80211_vif *vif,
 230                                     size_t frame_len,
 231                                     const struct ieee80211_tx_info *frame_txctl)
 232 {
 233         struct ieee80211_local *local = hw_to_local(hw);
 234         struct ieee80211_rate *rate;
 235         struct ieee80211_sub_if_data *sdata;
 236         bool short_preamble;
 237         int erp;
 238         u16 dur;
 239         struct ieee80211_supported_band *sband;
 240
 241         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 242
 243         short_preamble = false;
 244
 245         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 246         erp = 0;
 247         if (vif) {
 248                 sdata = vif_to_sdata(vif);
 249                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 250                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 251                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 252         }
 253
 254         /* Data frame duration */
 255         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 256                                        erp, short_preamble);
 257         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 258                 /* ACK duration */
 259                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 260                                                 erp, short_preamble);
 261         }
 262
 263         return cpu_to_le16(dur);
 264 }
 265 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 266
 267 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 268                                    enum queue_stop_reason reason)
 269 {
 270         struct ieee80211_local *local = hw_to_local(hw);
 271
 272         if (WARN_ON(queue >= hw->queues))
 273                 return;
 274
 275         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 276
 277         if (!skb_queue_empty(&local->pending[queue]) &&
 278             local->queue_stop_reasons[queue] ==
 279                                 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
 280                 tasklet_schedule(&local->tx_pending_tasklet);
 281
 282         if (local->queue_stop_reasons[queue] != 0)
 283                 /* someone still has this queue stopped */
 284                 return;
 285
 286         netif_wake_subqueue(local->mdev, queue);
 287 }
 288
 289 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 290                                     enum queue_stop_reason reason)
 291 {
 292         struct ieee80211_local *local = hw_to_local(hw);
 293         unsigned long flags;
 294
 295         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 296         __ieee80211_wake_queue(hw, queue, reason);
 297         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 298 }
 299
 300 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 301 {
 302         ieee80211_wake_queue_by_reason(hw, queue,
 303                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 304 }
 305 EXPORT_SYMBOL(ieee80211_wake_queue);
 306
 307 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 308                                    enum queue_stop_reason reason)
 309 {
 310         struct ieee80211_local *local = hw_to_local(hw);
 311
 312         if (WARN_ON(queue >= hw->queues))
 313                 return;
 314
 315         /*
 316          * Only stop if it was previously running, this is necessary
 317          * for correct pending packets handling because there we may
 318          * start (but not wake) the queue and rely on that.
 319          */
 320         if (!local->queue_stop_reasons[queue])
 321                 netif_stop_subqueue(local->mdev, queue);
 322
 323         __set_bit(reason, &local->queue_stop_reasons[queue]);
 324 }
 325
 326 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 327                                     enum queue_stop_reason reason)
 328 {
 329         struct ieee80211_local *local = hw_to_local(hw);
 330         unsigned long flags;
 331
 332         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 333         __ieee80211_stop_queue(hw, queue, reason);
 334         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 335 }
 336
 337 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 338 {
 339         ieee80211_stop_queue_by_reason(hw, queue,
 340                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 341 }
 342 EXPORT_SYMBOL(ieee80211_stop_queue);
 343
 344 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 345                                struct sk_buff *skb)
 346 {
 347         struct ieee80211_hw *hw = &local->hw;
 348         unsigned long flags;
 349         int queue = skb_get_queue_mapping(skb);
 350
 351         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 352         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 353         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_PENDING);
 354         skb_queue_tail(&local->pending[queue], skb);
 355         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 356         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 357 }
 358
 359 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 360                                struct sk_buff_head *skbs)
 361 {
 362         struct ieee80211_hw *hw = &local->hw;
 363         struct sk_buff *skb;
 364         unsigned long flags;
 365         int queue, ret = 0, i;
 366
 367         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 368         for (i = 0; i < hw->queues; i++)
 369                 __ieee80211_stop_queue(hw, i,
 370                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 371
 372         while ((skb = skb_dequeue(skbs))) {
 373                 ret++;
 374                 queue = skb_get_queue_mapping(skb);
 375                 skb_queue_tail(&local->pending[queue], skb);
 376         }
 377
 378         for (i = 0; i < hw->queues; i++) {
 379                 if (ret)
 380                         __ieee80211_stop_queue(hw, i,
 381                                 IEEE80211_QUEUE_STOP_REASON_PENDING);
 382                 __ieee80211_wake_queue(hw, i,
 383                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 384         }
 385         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 386
 387         return ret;
 388 }
 389
 390 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 391                                     enum queue_stop_reason reason)
 392 {
 393         struct ieee80211_local *local = hw_to_local(hw);
 394         unsigned long flags;
 395         int i;
 396
 397         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 398
 399         for (i = 0; i < hw->queues; i++)
 400                 __ieee80211_stop_queue(hw, i, reason);
 401
 402         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 403 }
 404
 405 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 406 {
 407         ieee80211_stop_queues_by_reason(hw,
 408                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 409 }
 410 EXPORT_SYMBOL(ieee80211_stop_queues);
 411
 412 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 413 {
 414         struct ieee80211_local *local = hw_to_local(hw);
 415
 416         if (WARN_ON(queue >= hw->queues))
 417                 return true;
 418
 419         return __netif_subqueue_stopped(local->mdev, queue);
 420 }
 421 EXPORT_SYMBOL(ieee80211_queue_stopped);
 422
 423 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 424                                      enum queue_stop_reason reason)
 425 {
 426         struct ieee80211_local *local = hw_to_local(hw);
 427         unsigned long flags;
 428         int i;
 429
 430         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 431
 432         for (i = 0; i < hw->queues; i++)
 433                 __ieee80211_wake_queue(hw, i, reason);
 434
 435         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 436 }
 437
 438 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 439 {
 440         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 441 }
 442 EXPORT_SYMBOL(ieee80211_wake_queues);
 443
 444 void ieee80211_iterate_active_interfaces(
 445         struct ieee80211_hw *hw,
 446         void (*iterator)(void *data, u8 *mac,
 447                          struct ieee80211_vif *vif),
 448         void *data)
 449 {
 450         struct ieee80211_local *local = hw_to_local(hw);
 451         struct ieee80211_sub_if_data *sdata;
 452
 453         mutex_lock(&local->iflist_mtx);
 454
 455         list_for_each_entry(sdata, &local->interfaces, list) {
 456                 switch (sdata->vif.type) {
 457                 case __NL80211_IFTYPE_AFTER_LAST:
 458                 case NL80211_IFTYPE_UNSPECIFIED:
 459                 case NL80211_IFTYPE_MONITOR:
 460                 case NL80211_IFTYPE_AP_VLAN:
 461                         continue;
 462                 case NL80211_IFTYPE_AP:
 463                 case NL80211_IFTYPE_STATION:
 464                 case NL80211_IFTYPE_ADHOC:
 465                 case NL80211_IFTYPE_WDS:
 466                 case NL80211_IFTYPE_MESH_POINT:
 467                         break;
 468                 }
 469                 if (netif_running(sdata->dev))
 470                         iterator(data, sdata->dev->dev_addr,
 471                                  &sdata->vif);
 472         }
 473
 474         mutex_unlock(&local->iflist_mtx);
 475 }
 476 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 477
 478 void ieee80211_iterate_active_interfaces_atomic(
 479         struct ieee80211_hw *hw,
 480         void (*iterator)(void *data, u8 *mac,
 481                          struct ieee80211_vif *vif),
 482         void *data)
 483 {
 484         struct ieee80211_local *local = hw_to_local(hw);
 485         struct ieee80211_sub_if_data *sdata;
 486
 487         rcu_read_lock();
 488
 489         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 490                 switch (sdata->vif.type) {
 491                 case __NL80211_IFTYPE_AFTER_LAST:
 492                 case NL80211_IFTYPE_UNSPECIFIED:
 493                 case NL80211_IFTYPE_MONITOR:
 494                 case NL80211_IFTYPE_AP_VLAN:
 495                         continue;
 496                 case NL80211_IFTYPE_AP:
 497                 case NL80211_IFTYPE_STATION:
 498                 case NL80211_IFTYPE_ADHOC:
 499                 case NL80211_IFTYPE_WDS:
 500                 case NL80211_IFTYPE_MESH_POINT:
 501                         break;
 502                 }
 503                 if (netif_running(sdata->dev))
 504                         iterator(data, sdata->dev->dev_addr,
 505                                  &sdata->vif);
 506         }
 507
 508         rcu_read_unlock();
 509 }
 510 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 511
 512 void ieee802_11_parse_elems(u8 *start, size_t len,
 513                             struct ieee802_11_elems *elems)
 514 {
 515         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 516 }
 517
 518 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 519                                struct ieee802_11_elems *elems,
 520                                u64 filter, u32 crc)
 521 {
 522         size_t left = len;
 523         u8 *pos = start;
 524         bool calc_crc = filter != 0;
 525
 526         memset(elems, 0, sizeof(*elems));
 527         elems->ie_start = start;
 528         elems->total_len = len;
 529
 530         while (left >= 2) {
 531                 u8 id, elen;
 532
 533                 id = *pos++;
 534                 elen = *pos++;
 535                 left -= 2;
 536
 537                 if (elen > left)
 538                         break;
 539
 540                 if (calc_crc && id < 64 && (filter & BIT(id)))
 541                         crc = crc32_be(crc, pos - 2, elen + 2);
 542
 543                 switch (id) {
 544                 case WLAN_EID_SSID:
 545                         elems->ssid = pos;
 546                         elems->ssid_len = elen;
 547                         break;
 548                 case WLAN_EID_SUPP_RATES:
 549                         elems->supp_rates = pos;
 550                         elems->supp_rates_len = elen;
 551                         break;
 552                 case WLAN_EID_FH_PARAMS:
 553                         elems->fh_params = pos;
 554                         elems->fh_params_len = elen;
 555                         break;
 556                 case WLAN_EID_DS_PARAMS:
 557                         elems->ds_params = pos;
 558                         elems->ds_params_len = elen;
 559                         break;
 560                 case WLAN_EID_CF_PARAMS:
 561                         elems->cf_params = pos;
 562                         elems->cf_params_len = elen;
 563                         break;
 564                 case WLAN_EID_TIM:
 565                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 566                                 elems->tim = (void *)pos;
 567                                 elems->tim_len = elen;
 568                         }
 569                         break;
 570                 case WLAN_EID_IBSS_PARAMS:
 571                         elems->ibss_params = pos;
 572                         elems->ibss_params_len = elen;
 573                         break;
 574                 case WLAN_EID_CHALLENGE:
 575                         elems->challenge = pos;
 576                         elems->challenge_len = elen;
 577                         break;
 578                 case WLAN_EID_VENDOR_SPECIFIC:
 579                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 580                             pos[2] == 0xf2) {
 581                                 /* Microsoft OUI (00:50:F2) */
 582
 583                                 if (calc_crc)
 584                                         crc = crc32_be(crc, pos - 2, elen + 2);
 585
 586                                 if (pos[3] == 1) {
 587                                         /* OUI Type 1 - WPA IE */
 588                                         elems->wpa = pos;
 589                                         elems->wpa_len = elen;
 590                                 } else if (elen >= 5 && pos[3] == 2) {
 591                                         /* OUI Type 2 - WMM IE */
 592                                         if (pos[4] == 0) {
 593                                                 elems->wmm_info = pos;
 594                                                 elems->wmm_info_len = elen;
 595                                         } else if (pos[4] == 1) {
 596                                                 elems->wmm_param = pos;
 597                                                 elems->wmm_param_len = elen;
 598                                         }
 599                                 }
 600                         }
 601                         break;
 602                 case WLAN_EID_RSN:
 603                         elems->rsn = pos;
 604                         elems->rsn_len = elen;
 605                         break;
 606                 case WLAN_EID_ERP_INFO:
 607                         elems->erp_info = pos;
 608                         elems->erp_info_len = elen;
 609                         break;
 610                 case WLAN_EID_EXT_SUPP_RATES:
 611                         elems->ext_supp_rates = pos;
 612                         elems->ext_supp_rates_len = elen;
 613                         break;
 614                 case WLAN_EID_HT_CAPABILITY:
 615                         if (elen >= sizeof(struct ieee80211_ht_cap))
 616                                 elems->ht_cap_elem = (void *)pos;
 617                         break;
 618                 case WLAN_EID_HT_INFORMATION:
 619                         if (elen >= sizeof(struct ieee80211_ht_info))
 620                                 elems->ht_info_elem = (void *)pos;
 621                         break;
 622                 case WLAN_EID_MESH_ID:
 623                         elems->mesh_id = pos;
 624                         elems->mesh_id_len = elen;
 625                         break;
 626                 case WLAN_EID_MESH_CONFIG:
 627                         elems->mesh_config = pos;
 628                         elems->mesh_config_len = elen;
 629                         break;
 630                 case WLAN_EID_PEER_LINK:
 631                         elems->peer_link = pos;
 632                         elems->peer_link_len = elen;
 633                         break;
 634                 case WLAN_EID_PREQ:
 635                         elems->preq = pos;
 636                         elems->preq_len = elen;
 637                         break;
 638                 case WLAN_EID_PREP:
 639                         elems->prep = pos;
 640                         elems->prep_len = elen;
 641                         break;
 642                 case WLAN_EID_PERR:
 643                         elems->perr = pos;
 644                         elems->perr_len = elen;
 645                         break;
 646                 case WLAN_EID_CHANNEL_SWITCH:
 647                         elems->ch_switch_elem = pos;
 648                         elems->ch_switch_elem_len = elen;
 649                         break;
 650                 case WLAN_EID_QUIET:
 651                         if (!elems->quiet_elem) {
 652                                 elems->quiet_elem = pos;
 653                                 elems->quiet_elem_len = elen;
 654                         }
 655                         elems->num_of_quiet_elem++;
 656                         break;
 657                 case WLAN_EID_COUNTRY:
 658                         elems->country_elem = pos;
 659                         elems->country_elem_len = elen;
 660                         break;
 661                 case WLAN_EID_PWR_CONSTRAINT:
 662                         elems->pwr_constr_elem = pos;
 663                         elems->pwr_constr_elem_len = elen;
 664                         break;
 665                 case WLAN_EID_TIMEOUT_INTERVAL:
 666                         elems->timeout_int = pos;
 667                         elems->timeout_int_len = elen;
 668                         break;
 669                 default:
 670                         break;
 671                 }
 672
 673                 left -= elen;
 674                 pos += elen;
 675         }
 676
 677         return crc;
 678 }
 679
 680 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 681 {
 682         struct ieee80211_local *local = sdata->local;
 683         struct ieee80211_tx_queue_params qparam;
 684         int queue;
 685         bool use_11b;
 686         int aCWmin, aCWmax;
 687
 688         if (!local->ops->conf_tx)
 689                 return;
 690
 691         memset(&qparam, 0, sizeof(qparam));
 692
 693         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 694                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 695
 696         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 697                 /* Set defaults according to 802.11-2007 Table 7-37 */
 698                 aCWmax = 1023;
 699                 if (use_11b)
 700                         aCWmin = 31;
 701                 else
 702                         aCWmin = 15;
 703
 704                 switch (queue) {
 705                 case 3: /* AC_BK */
 706                         qparam.cw_max = aCWmax;
 707                         qparam.cw_min = aCWmin;
 708                         qparam.txop = 0;
 709                         qparam.aifs = 7;
 710                         break;
 711                 default: /* never happens but let's not leave undefined */
 712                 case 2: /* AC_BE */
 713                         qparam.cw_max = aCWmax;
 714                         qparam.cw_min = aCWmin;
 715                         qparam.txop = 0;
 716                         qparam.aifs = 3;
 717                         break;
 718                 case 1: /* AC_VI */
 719                         qparam.cw_max = aCWmin;
 720                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 721                         if (use_11b)
 722                                 qparam.txop = 6016/32;
 723                         else
 724                                 qparam.txop = 3008/32;
 725                         qparam.aifs = 2;
 726                         break;
 727                 case 0: /* AC_VO */
 728                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 729                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 730                         if (use_11b)
 731                                 qparam.txop = 3264/32;
 732                         else
 733                                 qparam.txop = 1504/32;
 734                         qparam.aifs = 2;
 735                         break;
 736                 }
 737
 738                 drv_conf_tx(local, queue, &qparam);
 739         }
 740 }
 741
 742 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 743                                   const size_t supp_rates_len,
 744                                   const u8 *supp_rates)
 745 {
 746         struct ieee80211_local *local = sdata->local;
 747         int i, have_higher_than_11mbit = 0;
 748
 749         /* cf. IEEE 802.11 9.2.12 */
 750         for (i = 0; i < supp_rates_len; i++)
 751                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 752                         have_higher_than_11mbit = 1;
 753
 754         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 755             have_higher_than_11mbit)
 756                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 757         else
 758                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 759
 760         ieee80211_set_wmm_default(sdata);
 761 }
 762
 763 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 764                       int encrypt)
 765 {
 766         skb->dev = sdata->local->mdev;
 767         skb_set_mac_header(skb, 0);
 768         skb_set_network_header(skb, 0);
 769         skb_set_transport_header(skb, 0);
 770
 771         skb->iif = sdata->dev->ifindex;
 772         skb->do_not_encrypt = !encrypt;
 773
 774         dev_queue_xmit(skb);
 775 }
 776
 777 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 778                               enum ieee80211_band band)
 779 {
 780         struct ieee80211_supported_band *sband;
 781         struct ieee80211_rate *bitrates;
 782         u32 mandatory_rates;
 783         enum ieee80211_rate_flags mandatory_flag;
 784         int i;
 785
 786         sband = local->hw.wiphy->bands[band];
 787         if (!sband) {
 788                 WARN_ON(1);
 789                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 790         }
 791
 792         if (band == IEEE80211_BAND_2GHZ)
 793                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 794         else
 795                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 796
 797         bitrates = sband->bitrates;
 798         mandatory_rates = 0;
 799         for (i = 0; i < sband->n_bitrates; i++)
 800                 if (bitrates[i].flags & mandatory_flag)
 801                         mandatory_rates |= BIT(i);
 802         return mandatory_rates;
 803 }
 804
 805 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 806                          u16 transaction, u16 auth_alg,
 807                          u8 *extra, size_t extra_len,
 808                          const u8 *bssid, int encrypt)
 809 {
 810         struct ieee80211_local *local = sdata->local;
 811         struct sk_buff *skb;
 812         struct ieee80211_mgmt *mgmt;
 813
 814         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 815                             sizeof(*mgmt) + 6 + extra_len);
 816         if (!skb) {
 817                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 818                        "frame\n", sdata->dev->name);
 819                 return;
 820         }
 821         skb_reserve(skb, local->hw.extra_tx_headroom);
 822
 823         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 824         memset(mgmt, 0, 24 + 6);
 825         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 826                                           IEEE80211_STYPE_AUTH);
 827         if (encrypt)
 828                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 829         memcpy(mgmt->da, bssid, ETH_ALEN);
 830         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 831         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 832         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 833         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 834         mgmt->u.auth.status_code = cpu_to_le16(0);
 835         if (extra)
 836                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 837
 838         ieee80211_tx_skb(sdata, skb, encrypt);
 839 }
 840
 841 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 842                              const u8 *ie, size_t ie_len)
 843 {
 844         struct ieee80211_supported_band *sband;
 845         u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
 846         int i;
 847
 848         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 849
 850         pos = buffer;
 851
 852         *pos++ = WLAN_EID_SUPP_RATES;
 853         supp_rates_len = pos;
 854         *pos++ = 0;
 855
 856         for (i = 0; i < sband->n_bitrates; i++) {
 857                 struct ieee80211_rate *rate = &sband->bitrates[i];
 858
 859                 if (esupp_rates_len) {
 860                         *esupp_rates_len += 1;
 861                 } else if (*supp_rates_len == 8) {
 862                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
 863                         esupp_rates_len = pos;
 864                         *pos++ = 1;
 865                 } else
 866                         *supp_rates_len += 1;
 867
 868                 *pos++ = rate->bitrate / 5;
 869         }
 870
 871         if (sband->ht_cap.ht_supported) {
 872                 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
 873
 874                 *pos++ = WLAN_EID_HT_CAPABILITY;
 875                 *pos++ = sizeof(struct ieee80211_ht_cap);
 876                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 877                 memcpy(pos, &tmp, sizeof(u16));
 878                 pos += sizeof(u16);
 879                 /* TODO: needs a define here for << 2 */
 880                 *pos++ = sband->ht_cap.ampdu_factor |
 881                          (sband->ht_cap.ampdu_density << 2);
 882                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 883                 pos += sizeof(sband->ht_cap.mcs);
 884                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 885         }
 886
 887         /*
 888          * If adding more here, adjust code in main.c
 889          * that calculates local->scan_ies_len.
 890          */
 891
 892         if (ie) {
 893                 memcpy(pos, ie, ie_len);
 894                 pos += ie_len;
 895         }
 896
 897         return pos - buffer;
 898 }
 899
 900 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 901                               const u8 *ssid, size_t ssid_len,
 902                               const u8 *ie, size_t ie_len)
 903 {
 904         struct ieee80211_local *local = sdata->local;
 905         struct sk_buff *skb;
 906         struct ieee80211_mgmt *mgmt;
 907         u8 *pos;
 908
 909         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 910                             ie_len);
 911         if (!skb) {
 912                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 913                        "request\n", sdata->dev->name);
 914                 return;
 915         }
 916         skb_reserve(skb, local->hw.extra_tx_headroom);
 917
 918         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 919         memset(mgmt, 0, 24);
 920         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 921                                           IEEE80211_STYPE_PROBE_REQ);
 922         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 923         if (dst) {
 924                 memcpy(mgmt->da, dst, ETH_ALEN);
 925                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 926         } else {
 927                 memset(mgmt->da, 0xff, ETH_ALEN);
 928                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 929         }
 930         pos = skb_put(skb, 2 + ssid_len);
 931         *pos++ = WLAN_EID_SSID;
 932         *pos++ = ssid_len;
 933         memcpy(pos, ssid, ssid_len);
 934         pos += ssid_len;
 935
 936         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
 937
 938         ieee80211_tx_skb(sdata, skb, 0);
 939 }
 940
 941 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 942                             struct ieee802_11_elems *elems,
 943                             enum ieee80211_band band)
 944 {
 945         struct ieee80211_supported_band *sband;
 946         struct ieee80211_rate *bitrates;
 947         size_t num_rates;
 948         u32 supp_rates;
 949         int i, j;
 950         sband = local->hw.wiphy->bands[band];
 951
 952         if (!sband) {
 953                 WARN_ON(1);
 954                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 955         }
 956
 957         bitrates = sband->bitrates;
 958         num_rates = sband->n_bitrates;
 959         supp_rates = 0;
 960         for (i = 0; i < elems->supp_rates_len +
 961                      elems->ext_supp_rates_len; i++) {
 962                 u8 rate = 0;
 963                 int own_rate;
 964                 if (i < elems->supp_rates_len)
 965                         rate = elems->supp_rates[i];
 966                 else if (elems->ext_supp_rates)
 967                         rate = elems->ext_supp_rates
 968                                 [i - elems->supp_rates_len];
 969                 own_rate = 5 * (rate & 0x7f);
 970                 for (j = 0; j < num_rates; j++)
 971                         if (bitrates[j].bitrate == own_rate)
 972                                 supp_rates |= BIT(j);
 973         }
 974         return supp_rates;
 975 }
 976
 977 int ieee80211_reconfig(struct ieee80211_local *local)
 978 {
 979         struct ieee80211_hw *hw = &local->hw;
 980         struct ieee80211_sub_if_data *sdata;
 981         struct ieee80211_if_init_conf conf;
 982         struct sta_info *sta;
 983         unsigned long flags;
 984         int res;
 985         bool from_suspend = local->suspended;
 986
 987         /*
 988          * We're going to start the hardware, at that point
 989          * we are no longer suspended and can RX frames.
 990          */
 991         local->suspended = false;
 992
 993         /* restart hardware */
 994         if (local->open_count) {
 995                 res = drv_start(local);
 996
 997                 ieee80211_led_radio(local, true);
 998         }
 999
1000         /* add interfaces */
1001         list_for_each_entry(sdata, &local->interfaces, list) {
1002                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1003                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1004                     netif_running(sdata->dev)) {
1005                         conf.vif = &sdata->vif;
1006                         conf.type = sdata->vif.type;
1007                         conf.mac_addr = sdata->dev->dev_addr;
1008                         res = drv_add_interface(local, &conf);
1009                 }
1010         }
1011
1012         /* add STAs back */
1013         if (local->ops->sta_notify) {
1014                 spin_lock_irqsave(&local->sta_lock, flags);
1015                 list_for_each_entry(sta, &local->sta_list, list) {
1016                         sdata = sta->sdata;
1017                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1018                                 sdata = container_of(sdata->bss,
1019                                              struct ieee80211_sub_if_data,
1020                                              u.ap);
1021
1022                         drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1023                                        &sta->sta);
1024                 }
1025                 spin_unlock_irqrestore(&local->sta_lock, flags);
1026         }
1027
1028         /* Clear Suspend state so that ADDBA requests can be processed */
1029
1030         rcu_read_lock();
1031
1032         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1033                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1034                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1035                 }
1036         }
1037
1038         rcu_read_unlock();
1039
1040         /* setup RTS threshold */
1041         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1042
1043         /* reconfigure hardware */
1044         ieee80211_hw_config(local, ~0);
1045
1046         netif_addr_lock_bh(local->mdev);
1047         ieee80211_configure_filter(local);
1048         netif_addr_unlock_bh(local->mdev);
1049
1050         /* Finally also reconfigure all the BSS information */
1051         list_for_each_entry(sdata, &local->interfaces, list) {
1052                 u32 changed = ~0;
1053                 if (!netif_running(sdata->dev))
1054                         continue;
1055                 switch (sdata->vif.type) {
1056                 case NL80211_IFTYPE_STATION:
1057                         /* disable beacon change bits */
1058                         changed &= ~(BSS_CHANGED_BEACON |
1059                                      BSS_CHANGED_BEACON_ENABLED);
1060                         /* fall through */
1061                 case NL80211_IFTYPE_ADHOC:
1062                 case NL80211_IFTYPE_AP:
1063                 case NL80211_IFTYPE_MESH_POINT:
1064                         ieee80211_bss_info_change_notify(sdata, changed);
1065                         break;
1066                 case NL80211_IFTYPE_WDS:
1067                         break;
1068                 case NL80211_IFTYPE_AP_VLAN:
1069                 case NL80211_IFTYPE_MONITOR:
1070                         /* ignore virtual */
1071                         break;
1072                 case NL80211_IFTYPE_UNSPECIFIED:
1073                 case __NL80211_IFTYPE_AFTER_LAST:
1074                         WARN_ON(1);
1075                         break;
1076                 }
1077         }
1078
1079         /* add back keys */
1080         list_for_each_entry(sdata, &local->interfaces, list)
1081                 if (netif_running(sdata->dev))
1082                         ieee80211_enable_keys(sdata);
1083
1084         ieee80211_wake_queues_by_reason(hw,
1085                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1086
1087         /*
1088          * If this is for hw restart things are still running.
1089          * We may want to change that later, however.
1090          */
1091         if (!from_suspend)
1092                 return 0;
1093
1094 #ifdef CONFIG_PM
1095         local->suspended = false;
1096
1097         list_for_each_entry(sdata, &local->interfaces, list) {
1098                 switch(sdata->vif.type) {
1099                 case NL80211_IFTYPE_STATION:
1100                         ieee80211_sta_restart(sdata);
1101                         break;
1102                 case NL80211_IFTYPE_ADHOC:
1103                         ieee80211_ibss_restart(sdata);
1104                         break;
1105                 case NL80211_IFTYPE_MESH_POINT:
1106                         ieee80211_mesh_restart(sdata);
1107                         break;
1108                 default:
1109                         break;
1110                 }
1111         }
1112
1113         add_timer(&local->sta_cleanup);
1114
1115         spin_lock_irqsave(&local->sta_lock, flags);
1116         list_for_each_entry(sta, &local->sta_list, list)
1117                 mesh_plink_restart(sta);
1118         spin_unlock_irqrestore(&local->sta_lock, flags);
1119 #else
1120         WARN_ON(1);
1121 #endif
1122         return 0;
1123 }