git.oblomov.eu Git - linux-2.6/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
  35 /* privid for wiphys to determine whether they belong to us or not */
  36 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  37
  38 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
  39 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  40 const unsigned char rfc1042_header[] __aligned(2) =
  41         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  42
  43 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  44 const unsigned char bridge_tunnel_header[] __aligned(2) =
  45         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  46
  47 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  48 {
  49         struct ieee80211_local *local;
  50         BUG_ON(!wiphy);
  51
  52         local = wiphy_priv(wiphy);
  53         return &local->hw;
  54 }
  55 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  56
  57 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  58                         enum nl80211_iftype type)
  59 {
  60         __le16 fc = hdr->frame_control;
  61
  62          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  63         if (len < 16)
  64                 return NULL;
  65
  66         if (ieee80211_is_data(fc)) {
  67                 if (len < 24) /* drop incorrect hdr len (data) */
  68                         return NULL;
  69
  70                 if (ieee80211_has_a4(fc))
  71                         return NULL;
  72                 if (ieee80211_has_tods(fc))
  73                         return hdr->addr1;
  74                 if (ieee80211_has_fromds(fc))
  75                         return hdr->addr2;
  76
  77                 return hdr->addr3;
  78         }
  79
  80         if (ieee80211_is_mgmt(fc)) {
  81                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  82                         return NULL;
  83                 return hdr->addr3;
  84         }
  85
  86         if (ieee80211_is_ctl(fc)) {
  87                 if(ieee80211_is_pspoll(fc))
  88                         return hdr->addr1;
  89
  90                 if (ieee80211_is_back_req(fc)) {
  91                         switch (type) {
  92                         case NL80211_IFTYPE_STATION:
  93                                 return hdr->addr2;
  94                         case NL80211_IFTYPE_AP:
  95                         case NL80211_IFTYPE_AP_VLAN:
  96                                 return hdr->addr1;
  97                         default:
  98                                 break; /* fall through to the return */
  99                         }
 100                 }
 101         }
 102
 103         return NULL;
 104 }
 105
 106 unsigned int ieee80211_hdrlen(__le16 fc)
 107 {
 108         unsigned int hdrlen = 24;
 109
 110         if (ieee80211_is_data(fc)) {
 111                 if (ieee80211_has_a4(fc))
 112                         hdrlen = 30;
 113                 if (ieee80211_is_data_qos(fc))
 114                         hdrlen += IEEE80211_QOS_CTL_LEN;
 115                 goto out;
 116         }
 117
 118         if (ieee80211_is_ctl(fc)) {
 119                 /*
 120                  * ACK and CTS are 10 bytes, all others 16. To see how
 121                  * to get this condition consider
 122                  *   subtype mask:   0b0000000011110000 (0x00F0)
 123                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 124                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 125                  *   bits that matter:         ^^^      (0x00E0)
 126                  *   value of those: 0b0000000011000000 (0x00C0)
 127                  */
 128                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 129                         hdrlen = 10;
 130                 else
 131                         hdrlen = 16;
 132         }
 133 out:
 134         return hdrlen;
 135 }
 136 EXPORT_SYMBOL(ieee80211_hdrlen);
 137
 138 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 139 {
 140         const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
 141         unsigned int hdrlen;
 142
 143         if (unlikely(skb->len < 10))
 144                 return 0;
 145         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 146         if (unlikely(hdrlen > skb->len))
 147                 return 0;
 148         return hdrlen;
 149 }
 150 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 151
 152 int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 153 {
 154         int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
 155         /* 7.1.3.5a.2 */
 156         switch (ae) {
 157         case 0:
 158                 return 6;
 159         case 1:
 160                 return 12;
 161         case 2:
 162                 return 18;
 163         case 3:
 164                 return 24;
 165         default:
 166                 return 6;
 167         }
 168 }
 169
 170 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
 171 {
 172         struct sk_buff *skb = tx->skb;
 173         struct ieee80211_hdr *hdr;
 174
 175         do {
 176                 hdr = (struct ieee80211_hdr *) skb->data;
 177                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 178         } while ((skb = skb->next));
 179 }
 180
 181 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 182                              int rate, int erp, int short_preamble)
 183 {
 184         int dur;
 185
 186         /* calculate duration (in microseconds, rounded up to next higher
 187          * integer if it includes a fractional microsecond) to send frame of
 188          * len bytes (does not include FCS) at the given rate. Duration will
 189          * also include SIFS.
 190          *
 191          * rate is in 100 kbps, so divident is multiplied by 10 in the
 192          * DIV_ROUND_UP() operations.
 193          */
 194
 195         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 196                 /*
 197                  * OFDM:
 198                  *
 199                  * N_DBPS = DATARATE x 4
 200                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 201                  *      (16 = SIGNAL time, 6 = tail bits)
 202                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 203                  *
 204                  * T_SYM = 4 usec
 205                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 206                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 207                  *      signal ext = 6 usec
 208                  */
 209                 dur = 16; /* SIFS + signal ext */
 210                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 211                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 212                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 213                                         4 * rate); /* T_SYM x N_SYM */
 214         } else {
 215                 /*
 216                  * 802.11b or 802.11g with 802.11b compatibility:
 217                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 218                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 219                  *
 220                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 221                  * aSIFSTime = 10 usec
 222                  * aPreambleLength = 144 usec or 72 usec with short preamble
 223                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 224                  */
 225                 dur = 10; /* aSIFSTime = 10 usec */
 226                 dur += short_preamble ? (72 + 24) : (144 + 48);
 227
 228                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 229         }
 230
 231         return dur;
 232 }
 233
 234 /* Exported duration function for driver use */
 235 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 236                                         struct ieee80211_vif *vif,
 237                                         size_t frame_len,
 238                                         struct ieee80211_rate *rate)
 239 {
 240         struct ieee80211_local *local = hw_to_local(hw);
 241         struct ieee80211_sub_if_data *sdata;
 242         u16 dur;
 243         int erp;
 244         bool short_preamble = false;
 245
 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         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 255                                        short_preamble);
 256
 257         return cpu_to_le16(dur);
 258 }
 259 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 260
 261 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 262                               struct ieee80211_vif *vif, size_t frame_len,
 263                               const struct ieee80211_tx_info *frame_txctl)
 264 {
 265         struct ieee80211_local *local = hw_to_local(hw);
 266         struct ieee80211_rate *rate;
 267         struct ieee80211_sub_if_data *sdata;
 268         bool short_preamble;
 269         int erp;
 270         u16 dur;
 271         struct ieee80211_supported_band *sband;
 272
 273         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 274
 275         short_preamble = false;
 276
 277         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 278
 279         erp = 0;
 280         if (vif) {
 281                 sdata = vif_to_sdata(vif);
 282                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 283                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 284                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 285         }
 286
 287         /* CTS duration */
 288         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 289                                        erp, short_preamble);
 290         /* Data frame duration */
 291         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 292                                         erp, short_preamble);
 293         /* ACK duration */
 294         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 295                                         erp, short_preamble);
 296
 297         return cpu_to_le16(dur);
 298 }
 299 EXPORT_SYMBOL(ieee80211_rts_duration);
 300
 301 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 302                                     struct ieee80211_vif *vif,
 303                                     size_t frame_len,
 304                                     const struct ieee80211_tx_info *frame_txctl)
 305 {
 306         struct ieee80211_local *local = hw_to_local(hw);
 307         struct ieee80211_rate *rate;
 308         struct ieee80211_sub_if_data *sdata;
 309         bool short_preamble;
 310         int erp;
 311         u16 dur;
 312         struct ieee80211_supported_band *sband;
 313
 314         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 315
 316         short_preamble = false;
 317
 318         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 319         erp = 0;
 320         if (vif) {
 321                 sdata = vif_to_sdata(vif);
 322                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 323                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 324                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 325         }
 326
 327         /* Data frame duration */
 328         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 329                                        erp, short_preamble);
 330         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 331                 /* ACK duration */
 332                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 333                                                 erp, short_preamble);
 334         }
 335
 336         return cpu_to_le16(dur);
 337 }
 338 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 339
 340 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 341                                    enum queue_stop_reason reason)
 342 {
 343         struct ieee80211_local *local = hw_to_local(hw);
 344
 345         if (WARN_ON(queue >= hw->queues))
 346                 return;
 347
 348         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 349
 350         if (!skb_queue_empty(&local->pending[queue]) &&
 351             local->queue_stop_reasons[queue] ==
 352                                 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
 353                 tasklet_schedule(&local->tx_pending_tasklet);
 354
 355         if (local->queue_stop_reasons[queue] != 0)
 356                 /* someone still has this queue stopped */
 357                 return;
 358
 359         netif_wake_subqueue(local->mdev, queue);
 360 }
 361
 362 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 363                                     enum queue_stop_reason reason)
 364 {
 365         struct ieee80211_local *local = hw_to_local(hw);
 366         unsigned long flags;
 367
 368         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 369         __ieee80211_wake_queue(hw, queue, reason);
 370         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 371 }
 372
 373 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 374 {
 375         ieee80211_wake_queue_by_reason(hw, queue,
 376                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 377 }
 378 EXPORT_SYMBOL(ieee80211_wake_queue);
 379
 380 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 381                                    enum queue_stop_reason reason)
 382 {
 383         struct ieee80211_local *local = hw_to_local(hw);
 384
 385         if (WARN_ON(queue >= hw->queues))
 386                 return;
 387
 388         /*
 389          * Only stop if it was previously running, this is necessary
 390          * for correct pending packets handling because there we may
 391          * start (but not wake) the queue and rely on that.
 392          */
 393         if (!local->queue_stop_reasons[queue])
 394                 netif_stop_subqueue(local->mdev, queue);
 395
 396         __set_bit(reason, &local->queue_stop_reasons[queue]);
 397 }
 398
 399 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 400                                     enum queue_stop_reason reason)
 401 {
 402         struct ieee80211_local *local = hw_to_local(hw);
 403         unsigned long flags;
 404
 405         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 406         __ieee80211_stop_queue(hw, queue, reason);
 407         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 408 }
 409
 410 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 411 {
 412         ieee80211_stop_queue_by_reason(hw, queue,
 413                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 414 }
 415 EXPORT_SYMBOL(ieee80211_stop_queue);
 416
 417 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 418                                     enum queue_stop_reason reason)
 419 {
 420         struct ieee80211_local *local = hw_to_local(hw);
 421         unsigned long flags;
 422         int i;
 423
 424         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 425
 426         for (i = 0; i < hw->queues; i++)
 427                 __ieee80211_stop_queue(hw, i, reason);
 428
 429         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 430 }
 431
 432 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 433 {
 434         ieee80211_stop_queues_by_reason(hw,
 435                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 436 }
 437 EXPORT_SYMBOL(ieee80211_stop_queues);
 438
 439 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 440 {
 441         struct ieee80211_local *local = hw_to_local(hw);
 442
 443         if (WARN_ON(queue >= hw->queues))
 444                 return true;
 445
 446         return __netif_subqueue_stopped(local->mdev, queue);
 447 }
 448 EXPORT_SYMBOL(ieee80211_queue_stopped);
 449
 450 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 451                                      enum queue_stop_reason reason)
 452 {
 453         struct ieee80211_local *local = hw_to_local(hw);
 454         unsigned long flags;
 455         int i;
 456
 457         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 458
 459         for (i = 0; i < hw->queues; i++)
 460                 __ieee80211_wake_queue(hw, i, reason);
 461
 462         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 463 }
 464
 465 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 466 {
 467         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 468 }
 469 EXPORT_SYMBOL(ieee80211_wake_queues);
 470
 471 void ieee80211_iterate_active_interfaces(
 472         struct ieee80211_hw *hw,
 473         void (*iterator)(void *data, u8 *mac,
 474                          struct ieee80211_vif *vif),
 475         void *data)
 476 {
 477         struct ieee80211_local *local = hw_to_local(hw);
 478         struct ieee80211_sub_if_data *sdata;
 479
 480         mutex_lock(&local->iflist_mtx);
 481
 482         list_for_each_entry(sdata, &local->interfaces, list) {
 483                 switch (sdata->vif.type) {
 484                 case __NL80211_IFTYPE_AFTER_LAST:
 485                 case NL80211_IFTYPE_UNSPECIFIED:
 486                 case NL80211_IFTYPE_MONITOR:
 487                 case NL80211_IFTYPE_AP_VLAN:
 488                         continue;
 489                 case NL80211_IFTYPE_AP:
 490                 case NL80211_IFTYPE_STATION:
 491                 case NL80211_IFTYPE_ADHOC:
 492                 case NL80211_IFTYPE_WDS:
 493                 case NL80211_IFTYPE_MESH_POINT:
 494                         break;
 495                 }
 496                 if (netif_running(sdata->dev))
 497                         iterator(data, sdata->dev->dev_addr,
 498                                  &sdata->vif);
 499         }
 500
 501         mutex_unlock(&local->iflist_mtx);
 502 }
 503 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 504
 505 void ieee80211_iterate_active_interfaces_atomic(
 506         struct ieee80211_hw *hw,
 507         void (*iterator)(void *data, u8 *mac,
 508                          struct ieee80211_vif *vif),
 509         void *data)
 510 {
 511         struct ieee80211_local *local = hw_to_local(hw);
 512         struct ieee80211_sub_if_data *sdata;
 513
 514         rcu_read_lock();
 515
 516         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 517                 switch (sdata->vif.type) {
 518                 case __NL80211_IFTYPE_AFTER_LAST:
 519                 case NL80211_IFTYPE_UNSPECIFIED:
 520                 case NL80211_IFTYPE_MONITOR:
 521                 case NL80211_IFTYPE_AP_VLAN:
 522                         continue;
 523                 case NL80211_IFTYPE_AP:
 524                 case NL80211_IFTYPE_STATION:
 525                 case NL80211_IFTYPE_ADHOC:
 526                 case NL80211_IFTYPE_WDS:
 527                 case NL80211_IFTYPE_MESH_POINT:
 528                         break;
 529                 }
 530                 if (netif_running(sdata->dev))
 531                         iterator(data, sdata->dev->dev_addr,
 532                                  &sdata->vif);
 533         }
 534
 535         rcu_read_unlock();
 536 }
 537 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 538
 539 void ieee802_11_parse_elems(u8 *start, size_t len,
 540                             struct ieee802_11_elems *elems)
 541 {
 542         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 543 }
 544
 545 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 546                                struct ieee802_11_elems *elems,
 547                                u64 filter, u32 crc)
 548 {
 549         size_t left = len;
 550         u8 *pos = start;
 551         bool calc_crc = filter != 0;
 552
 553         memset(elems, 0, sizeof(*elems));
 554         elems->ie_start = start;
 555         elems->total_len = len;
 556
 557         while (left >= 2) {
 558                 u8 id, elen;
 559
 560                 id = *pos++;
 561                 elen = *pos++;
 562                 left -= 2;
 563
 564                 if (elen > left)
 565                         break;
 566
 567                 if (calc_crc && id < 64 && (filter & BIT(id)))
 568                         crc = crc32_be(crc, pos - 2, elen + 2);
 569
 570                 switch (id) {
 571                 case WLAN_EID_SSID:
 572                         elems->ssid = pos;
 573                         elems->ssid_len = elen;
 574                         break;
 575                 case WLAN_EID_SUPP_RATES:
 576                         elems->supp_rates = pos;
 577                         elems->supp_rates_len = elen;
 578                         break;
 579                 case WLAN_EID_FH_PARAMS:
 580                         elems->fh_params = pos;
 581                         elems->fh_params_len = elen;
 582                         break;
 583                 case WLAN_EID_DS_PARAMS:
 584                         elems->ds_params = pos;
 585                         elems->ds_params_len = elen;
 586                         break;
 587                 case WLAN_EID_CF_PARAMS:
 588                         elems->cf_params = pos;
 589                         elems->cf_params_len = elen;
 590                         break;
 591                 case WLAN_EID_TIM:
 592                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 593                                 elems->tim = (void *)pos;
 594                                 elems->tim_len = elen;
 595                         }
 596                         break;
 597                 case WLAN_EID_IBSS_PARAMS:
 598                         elems->ibss_params = pos;
 599                         elems->ibss_params_len = elen;
 600                         break;
 601                 case WLAN_EID_CHALLENGE:
 602                         elems->challenge = pos;
 603                         elems->challenge_len = elen;
 604                         break;
 605                 case WLAN_EID_VENDOR_SPECIFIC:
 606                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 607                             pos[2] == 0xf2) {
 608                                 /* Microsoft OUI (00:50:F2) */
 609
 610                                 if (calc_crc)
 611                                         crc = crc32_be(crc, pos - 2, elen + 2);
 612
 613                                 if (pos[3] == 1) {
 614                                         /* OUI Type 1 - WPA IE */
 615                                         elems->wpa = pos;
 616                                         elems->wpa_len = elen;
 617                                 } else if (elen >= 5 && pos[3] == 2) {
 618                                         /* OUI Type 2 - WMM IE */
 619                                         if (pos[4] == 0) {
 620                                                 elems->wmm_info = pos;
 621                                                 elems->wmm_info_len = elen;
 622                                         } else if (pos[4] == 1) {
 623                                                 elems->wmm_param = pos;
 624                                                 elems->wmm_param_len = elen;
 625                                         }
 626                                 }
 627                         }
 628                         break;
 629                 case WLAN_EID_RSN:
 630                         elems->rsn = pos;
 631                         elems->rsn_len = elen;
 632                         break;
 633                 case WLAN_EID_ERP_INFO:
 634                         elems->erp_info = pos;
 635                         elems->erp_info_len = elen;
 636                         break;
 637                 case WLAN_EID_EXT_SUPP_RATES:
 638                         elems->ext_supp_rates = pos;
 639                         elems->ext_supp_rates_len = elen;
 640                         break;
 641                 case WLAN_EID_HT_CAPABILITY:
 642                         if (elen >= sizeof(struct ieee80211_ht_cap))
 643                                 elems->ht_cap_elem = (void *)pos;
 644                         break;
 645                 case WLAN_EID_HT_INFORMATION:
 646                         if (elen >= sizeof(struct ieee80211_ht_info))
 647                                 elems->ht_info_elem = (void *)pos;
 648                         break;
 649                 case WLAN_EID_MESH_ID:
 650                         elems->mesh_id = pos;
 651                         elems->mesh_id_len = elen;
 652                         break;
 653                 case WLAN_EID_MESH_CONFIG:
 654                         elems->mesh_config = pos;
 655                         elems->mesh_config_len = elen;
 656                         break;
 657                 case WLAN_EID_PEER_LINK:
 658                         elems->peer_link = pos;
 659                         elems->peer_link_len = elen;
 660                         break;
 661                 case WLAN_EID_PREQ:
 662                         elems->preq = pos;
 663                         elems->preq_len = elen;
 664                         break;
 665                 case WLAN_EID_PREP:
 666                         elems->prep = pos;
 667                         elems->prep_len = elen;
 668                         break;
 669                 case WLAN_EID_PERR:
 670                         elems->perr = pos;
 671                         elems->perr_len = elen;
 672                         break;
 673                 case WLAN_EID_CHANNEL_SWITCH:
 674                         elems->ch_switch_elem = pos;
 675                         elems->ch_switch_elem_len = elen;
 676                         break;
 677                 case WLAN_EID_QUIET:
 678                         if (!elems->quiet_elem) {
 679                                 elems->quiet_elem = pos;
 680                                 elems->quiet_elem_len = elen;
 681                         }
 682                         elems->num_of_quiet_elem++;
 683                         break;
 684                 case WLAN_EID_COUNTRY:
 685                         elems->country_elem = pos;
 686                         elems->country_elem_len = elen;
 687                         break;
 688                 case WLAN_EID_PWR_CONSTRAINT:
 689                         elems->pwr_constr_elem = pos;
 690                         elems->pwr_constr_elem_len = elen;
 691                         break;
 692                 case WLAN_EID_TIMEOUT_INTERVAL:
 693                         elems->timeout_int = pos;
 694                         elems->timeout_int_len = elen;
 695                         break;
 696                 default:
 697                         break;
 698                 }
 699
 700                 left -= elen;
 701                 pos += elen;
 702         }
 703
 704         return crc;
 705 }
 706
 707 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 708 {
 709         struct ieee80211_local *local = sdata->local;
 710         struct ieee80211_tx_queue_params qparam;
 711         int i;
 712
 713         if (!local->ops->conf_tx)
 714                 return;
 715
 716         memset(&qparam, 0, sizeof(qparam));
 717
 718         qparam.aifs = 2;
 719
 720         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 721             !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
 722                 qparam.cw_min = 31;
 723         else
 724                 qparam.cw_min = 15;
 725
 726         qparam.cw_max = 1023;
 727         qparam.txop = 0;
 728
 729         for (i = 0; i < local_to_hw(local)->queues; i++)
 730                 drv_conf_tx(local, i, &qparam);
 731 }
 732
 733 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 734                                   const size_t supp_rates_len,
 735                                   const u8 *supp_rates)
 736 {
 737         struct ieee80211_local *local = sdata->local;
 738         int i, have_higher_than_11mbit = 0;
 739
 740         /* cf. IEEE 802.11 9.2.12 */
 741         for (i = 0; i < supp_rates_len; i++)
 742                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 743                         have_higher_than_11mbit = 1;
 744
 745         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 746             have_higher_than_11mbit)
 747                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 748         else
 749                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 750
 751         ieee80211_set_wmm_default(sdata);
 752 }
 753
 754 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 755                       int encrypt)
 756 {
 757         skb->dev = sdata->local->mdev;
 758         skb_set_mac_header(skb, 0);
 759         skb_set_network_header(skb, 0);
 760         skb_set_transport_header(skb, 0);
 761
 762         skb->iif = sdata->dev->ifindex;
 763         skb->do_not_encrypt = !encrypt;
 764
 765         dev_queue_xmit(skb);
 766 }
 767
 768 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
 769 {
 770         int ret = -EINVAL;
 771         struct ieee80211_channel *chan;
 772         struct ieee80211_local *local = sdata->local;
 773
 774         chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
 775
 776         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
 777                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 778                     chan->flags & IEEE80211_CHAN_NO_IBSS)
 779                         return ret;
 780                 local->oper_channel = chan;
 781                 local->oper_channel_type = NL80211_CHAN_NO_HT;
 782
 783                 if (local->sw_scanning || local->hw_scanning)
 784                         ret = 0;
 785                 else
 786                         ret = ieee80211_hw_config(
 787                                 local, IEEE80211_CONF_CHANGE_CHANNEL);
 788         }
 789
 790         return ret;
 791 }
 792
 793 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 794                               enum ieee80211_band band)
 795 {
 796         struct ieee80211_supported_band *sband;
 797         struct ieee80211_rate *bitrates;
 798         u32 mandatory_rates;
 799         enum ieee80211_rate_flags mandatory_flag;
 800         int i;
 801
 802         sband = local->hw.wiphy->bands[band];
 803         if (!sband) {
 804                 WARN_ON(1);
 805                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 806         }
 807
 808         if (band == IEEE80211_BAND_2GHZ)
 809                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 810         else
 811                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 812
 813         bitrates = sband->bitrates;
 814         mandatory_rates = 0;
 815         for (i = 0; i < sband->n_bitrates; i++)
 816                 if (bitrates[i].flags & mandatory_flag)
 817                         mandatory_rates |= BIT(i);
 818         return mandatory_rates;
 819 }
 820
 821 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 822                          u16 transaction, u16 auth_alg,
 823                          u8 *extra, size_t extra_len,
 824                          const u8 *bssid, int encrypt)
 825 {
 826         struct ieee80211_local *local = sdata->local;
 827         struct sk_buff *skb;
 828         struct ieee80211_mgmt *mgmt;
 829
 830         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 831                             sizeof(*mgmt) + 6 + extra_len);
 832         if (!skb) {
 833                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 834                        "frame\n", sdata->dev->name);
 835                 return;
 836         }
 837         skb_reserve(skb, local->hw.extra_tx_headroom);
 838
 839         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 840         memset(mgmt, 0, 24 + 6);
 841         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 842                                           IEEE80211_STYPE_AUTH);
 843         if (encrypt)
 844                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 845         memcpy(mgmt->da, bssid, ETH_ALEN);
 846         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 847         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 848         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 849         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 850         mgmt->u.auth.status_code = cpu_to_le16(0);
 851         if (extra)
 852                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 853
 854         ieee80211_tx_skb(sdata, skb, encrypt);
 855 }
 856
 857 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 858                              const u8 *ie, size_t ie_len)
 859 {
 860         struct ieee80211_supported_band *sband;
 861         u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
 862         int i;
 863
 864         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 865
 866         pos = buffer;
 867
 868         *pos++ = WLAN_EID_SUPP_RATES;
 869         supp_rates_len = pos;
 870         *pos++ = 0;
 871
 872         for (i = 0; i < sband->n_bitrates; i++) {
 873                 struct ieee80211_rate *rate = &sband->bitrates[i];
 874
 875                 if (esupp_rates_len) {
 876                         *esupp_rates_len += 1;
 877                 } else if (*supp_rates_len == 8) {
 878                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
 879                         esupp_rates_len = pos;
 880                         *pos++ = 1;
 881                 } else
 882                         *supp_rates_len += 1;
 883
 884                 *pos++ = rate->bitrate / 5;
 885         }
 886
 887         if (sband->ht_cap.ht_supported) {
 888                 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
 889
 890                 *pos++ = WLAN_EID_HT_CAPABILITY;
 891                 *pos++ = sizeof(struct ieee80211_ht_cap);
 892                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 893                 memcpy(pos, &tmp, sizeof(u16));
 894                 pos += sizeof(u16);
 895                 /* TODO: needs a define here for << 2 */
 896                 *pos++ = sband->ht_cap.ampdu_factor |
 897                          (sband->ht_cap.ampdu_density << 2);
 898                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 899                 pos += sizeof(sband->ht_cap.mcs);
 900                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 901         }
 902
 903         /*
 904          * If adding more here, adjust code in main.c
 905          * that calculates local->scan_ies_len.
 906          */
 907
 908         if (ie) {
 909                 memcpy(pos, ie, ie_len);
 910                 pos += ie_len;
 911         }
 912
 913         return pos - buffer;
 914 }
 915
 916 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 917                               const u8 *ssid, size_t ssid_len,
 918                               const u8 *ie, size_t ie_len)
 919 {
 920         struct ieee80211_local *local = sdata->local;
 921         struct sk_buff *skb;
 922         struct ieee80211_mgmt *mgmt;
 923         u8 *pos;
 924
 925         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 926                             ie_len);
 927         if (!skb) {
 928                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 929                        "request\n", sdata->dev->name);
 930                 return;
 931         }
 932         skb_reserve(skb, local->hw.extra_tx_headroom);
 933
 934         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 935         memset(mgmt, 0, 24);
 936         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 937                                           IEEE80211_STYPE_PROBE_REQ);
 938         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 939         if (dst) {
 940                 memcpy(mgmt->da, dst, ETH_ALEN);
 941                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 942         } else {
 943                 memset(mgmt->da, 0xff, ETH_ALEN);
 944                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 945         }
 946         pos = skb_put(skb, 2 + ssid_len);
 947         *pos++ = WLAN_EID_SSID;
 948         *pos++ = ssid_len;
 949         memcpy(pos, ssid, ssid_len);
 950         pos += ssid_len;
 951
 952         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
 953
 954         ieee80211_tx_skb(sdata, skb, 0);
 955 }
 956
 957 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 958                             struct ieee802_11_elems *elems,
 959                             enum ieee80211_band band)
 960 {
 961         struct ieee80211_supported_band *sband;
 962         struct ieee80211_rate *bitrates;
 963         size_t num_rates;
 964         u32 supp_rates;
 965         int i, j;
 966         sband = local->hw.wiphy->bands[band];
 967
 968         if (!sband) {
 969                 WARN_ON(1);
 970                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 971         }
 972
 973         bitrates = sband->bitrates;
 974         num_rates = sband->n_bitrates;
 975         supp_rates = 0;
 976         for (i = 0; i < elems->supp_rates_len +
 977                      elems->ext_supp_rates_len; i++) {
 978                 u8 rate = 0;
 979                 int own_rate;
 980                 if (i < elems->supp_rates_len)
 981                         rate = elems->supp_rates[i];
 982                 else if (elems->ext_supp_rates)
 983                         rate = elems->ext_supp_rates
 984                                 [i - elems->supp_rates_len];
 985                 own_rate = 5 * (rate & 0x7f);
 986                 for (j = 0; j < num_rates; j++)
 987                         if (bitrates[j].bitrate == own_rate)
 988                                 supp_rates |= BIT(j);
 989         }
 990         return supp_rates;
 991 }
 992
 993 int ieee80211_reconfig(struct ieee80211_local *local)
 994 {
 995         struct ieee80211_hw *hw = &local->hw;
 996         struct ieee80211_sub_if_data *sdata;
 997         struct ieee80211_if_init_conf conf;
 998         struct sta_info *sta;
 999         unsigned long flags;
1000         int res;
1001
1002         /* restart hardware */
1003         if (local->open_count) {
1004                 res = drv_start(local);
1005
1006                 ieee80211_led_radio(local, hw->conf.radio_enabled);
1007         }
1008
1009         /* add interfaces */
1010         list_for_each_entry(sdata, &local->interfaces, list) {
1011                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1012                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1013                     netif_running(sdata->dev)) {
1014                         conf.vif = &sdata->vif;
1015                         conf.type = sdata->vif.type;
1016                         conf.mac_addr = sdata->dev->dev_addr;
1017                         res = drv_add_interface(local, &conf);
1018                 }
1019         }
1020
1021         /* add STAs back */
1022         if (local->ops->sta_notify) {
1023                 spin_lock_irqsave(&local->sta_lock, flags);
1024                 list_for_each_entry(sta, &local->sta_list, list) {
1025                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1026                                 sdata = container_of(sdata->bss,
1027                                              struct ieee80211_sub_if_data,
1028                                              u.ap);
1029
1030                         drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1031                                        &sta->sta);
1032                 }
1033                 spin_unlock_irqrestore(&local->sta_lock, flags);
1034         }
1035
1036         /* Clear Suspend state so that ADDBA requests can be processed */
1037
1038         rcu_read_lock();
1039
1040         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1041                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1042                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1043                 }
1044         }
1045
1046         rcu_read_unlock();
1047
1048         /* setup RTS threshold */
1049         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1050
1051         /* reconfigure hardware */
1052         ieee80211_hw_config(local, ~0);
1053
1054         netif_addr_lock_bh(local->mdev);
1055         ieee80211_configure_filter(local);
1056         netif_addr_unlock_bh(local->mdev);
1057
1058         /* Finally also reconfigure all the BSS information */
1059         list_for_each_entry(sdata, &local->interfaces, list) {
1060                 u32 changed = ~0;
1061                 if (!netif_running(sdata->dev))
1062                         continue;
1063                 switch (sdata->vif.type) {
1064                 case NL80211_IFTYPE_STATION:
1065                         /* disable beacon change bits */
1066                         changed &= ~(BSS_CHANGED_BEACON |
1067                                      BSS_CHANGED_BEACON_ENABLED);
1068                         /* fall through */
1069                 case NL80211_IFTYPE_ADHOC:
1070                 case NL80211_IFTYPE_AP:
1071                 case NL80211_IFTYPE_MESH_POINT:
1072                         ieee80211_bss_info_change_notify(sdata, changed);
1073                         break;
1074                 case NL80211_IFTYPE_WDS:
1075                         break;
1076                 case NL80211_IFTYPE_AP_VLAN:
1077                 case NL80211_IFTYPE_MONITOR:
1078                         /* ignore virtual */
1079                         break;
1080                 case NL80211_IFTYPE_UNSPECIFIED:
1081                 case __NL80211_IFTYPE_AFTER_LAST:
1082                         WARN_ON(1);
1083                         break;
1084                 }
1085         }
1086
1087         /* add back keys */
1088         list_for_each_entry(sdata, &local->interfaces, list)
1089                 if (netif_running(sdata->dev))
1090                         ieee80211_enable_keys(sdata);
1091
1092         ieee80211_wake_queues_by_reason(hw,
1093                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1094
1095         return 0;
1096 }