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 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_stop_queues_by_reason(struct ieee80211_hw *hw,
 345                                     enum queue_stop_reason reason)
 346 {
 347         struct ieee80211_local *local = hw_to_local(hw);
 348         unsigned long flags;
 349         int i;
 350
 351         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 352
 353         for (i = 0; i < hw->queues; i++)
 354                 __ieee80211_stop_queue(hw, i, reason);
 355
 356         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 357 }
 358
 359 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 360 {
 361         ieee80211_stop_queues_by_reason(hw,
 362                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 363 }
 364 EXPORT_SYMBOL(ieee80211_stop_queues);
 365
 366 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 367 {
 368         struct ieee80211_local *local = hw_to_local(hw);
 369
 370         if (WARN_ON(queue >= hw->queues))
 371                 return true;
 372
 373         return __netif_subqueue_stopped(local->mdev, queue);
 374 }
 375 EXPORT_SYMBOL(ieee80211_queue_stopped);
 376
 377 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 378                                      enum queue_stop_reason reason)
 379 {
 380         struct ieee80211_local *local = hw_to_local(hw);
 381         unsigned long flags;
 382         int i;
 383
 384         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 385
 386         for (i = 0; i < hw->queues; i++)
 387                 __ieee80211_wake_queue(hw, i, reason);
 388
 389         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 390 }
 391
 392 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 393 {
 394         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 395 }
 396 EXPORT_SYMBOL(ieee80211_wake_queues);
 397
 398 void ieee80211_iterate_active_interfaces(
 399         struct ieee80211_hw *hw,
 400         void (*iterator)(void *data, u8 *mac,
 401                          struct ieee80211_vif *vif),
 402         void *data)
 403 {
 404         struct ieee80211_local *local = hw_to_local(hw);
 405         struct ieee80211_sub_if_data *sdata;
 406
 407         mutex_lock(&local->iflist_mtx);
 408
 409         list_for_each_entry(sdata, &local->interfaces, list) {
 410                 switch (sdata->vif.type) {
 411                 case __NL80211_IFTYPE_AFTER_LAST:
 412                 case NL80211_IFTYPE_UNSPECIFIED:
 413                 case NL80211_IFTYPE_MONITOR:
 414                 case NL80211_IFTYPE_AP_VLAN:
 415                         continue;
 416                 case NL80211_IFTYPE_AP:
 417                 case NL80211_IFTYPE_STATION:
 418                 case NL80211_IFTYPE_ADHOC:
 419                 case NL80211_IFTYPE_WDS:
 420                 case NL80211_IFTYPE_MESH_POINT:
 421                         break;
 422                 }
 423                 if (netif_running(sdata->dev))
 424                         iterator(data, sdata->dev->dev_addr,
 425                                  &sdata->vif);
 426         }
 427
 428         mutex_unlock(&local->iflist_mtx);
 429 }
 430 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 431
 432 void ieee80211_iterate_active_interfaces_atomic(
 433         struct ieee80211_hw *hw,
 434         void (*iterator)(void *data, u8 *mac,
 435                          struct ieee80211_vif *vif),
 436         void *data)
 437 {
 438         struct ieee80211_local *local = hw_to_local(hw);
 439         struct ieee80211_sub_if_data *sdata;
 440
 441         rcu_read_lock();
 442
 443         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 444                 switch (sdata->vif.type) {
 445                 case __NL80211_IFTYPE_AFTER_LAST:
 446                 case NL80211_IFTYPE_UNSPECIFIED:
 447                 case NL80211_IFTYPE_MONITOR:
 448                 case NL80211_IFTYPE_AP_VLAN:
 449                         continue;
 450                 case NL80211_IFTYPE_AP:
 451                 case NL80211_IFTYPE_STATION:
 452                 case NL80211_IFTYPE_ADHOC:
 453                 case NL80211_IFTYPE_WDS:
 454                 case NL80211_IFTYPE_MESH_POINT:
 455                         break;
 456                 }
 457                 if (netif_running(sdata->dev))
 458                         iterator(data, sdata->dev->dev_addr,
 459                                  &sdata->vif);
 460         }
 461
 462         rcu_read_unlock();
 463 }
 464 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 465
 466 void ieee802_11_parse_elems(u8 *start, size_t len,
 467                             struct ieee802_11_elems *elems)
 468 {
 469         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 470 }
 471
 472 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 473                                struct ieee802_11_elems *elems,
 474                                u64 filter, u32 crc)
 475 {
 476         size_t left = len;
 477         u8 *pos = start;
 478         bool calc_crc = filter != 0;
 479
 480         memset(elems, 0, sizeof(*elems));
 481         elems->ie_start = start;
 482         elems->total_len = len;
 483
 484         while (left >= 2) {
 485                 u8 id, elen;
 486
 487                 id = *pos++;
 488                 elen = *pos++;
 489                 left -= 2;
 490
 491                 if (elen > left)
 492                         break;
 493
 494                 if (calc_crc && id < 64 && (filter & BIT(id)))
 495                         crc = crc32_be(crc, pos - 2, elen + 2);
 496
 497                 switch (id) {
 498                 case WLAN_EID_SSID:
 499                         elems->ssid = pos;
 500                         elems->ssid_len = elen;
 501                         break;
 502                 case WLAN_EID_SUPP_RATES:
 503                         elems->supp_rates = pos;
 504                         elems->supp_rates_len = elen;
 505                         break;
 506                 case WLAN_EID_FH_PARAMS:
 507                         elems->fh_params = pos;
 508                         elems->fh_params_len = elen;
 509                         break;
 510                 case WLAN_EID_DS_PARAMS:
 511                         elems->ds_params = pos;
 512                         elems->ds_params_len = elen;
 513                         break;
 514                 case WLAN_EID_CF_PARAMS:
 515                         elems->cf_params = pos;
 516                         elems->cf_params_len = elen;
 517                         break;
 518                 case WLAN_EID_TIM:
 519                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 520                                 elems->tim = (void *)pos;
 521                                 elems->tim_len = elen;
 522                         }
 523                         break;
 524                 case WLAN_EID_IBSS_PARAMS:
 525                         elems->ibss_params = pos;
 526                         elems->ibss_params_len = elen;
 527                         break;
 528                 case WLAN_EID_CHALLENGE:
 529                         elems->challenge = pos;
 530                         elems->challenge_len = elen;
 531                         break;
 532                 case WLAN_EID_VENDOR_SPECIFIC:
 533                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 534                             pos[2] == 0xf2) {
 535                                 /* Microsoft OUI (00:50:F2) */
 536
 537                                 if (calc_crc)
 538                                         crc = crc32_be(crc, pos - 2, elen + 2);
 539
 540                                 if (pos[3] == 1) {
 541                                         /* OUI Type 1 - WPA IE */
 542                                         elems->wpa = pos;
 543                                         elems->wpa_len = elen;
 544                                 } else if (elen >= 5 && pos[3] == 2) {
 545                                         /* OUI Type 2 - WMM IE */
 546                                         if (pos[4] == 0) {
 547                                                 elems->wmm_info = pos;
 548                                                 elems->wmm_info_len = elen;
 549                                         } else if (pos[4] == 1) {
 550                                                 elems->wmm_param = pos;
 551                                                 elems->wmm_param_len = elen;
 552                                         }
 553                                 }
 554                         }
 555                         break;
 556                 case WLAN_EID_RSN:
 557                         elems->rsn = pos;
 558                         elems->rsn_len = elen;
 559                         break;
 560                 case WLAN_EID_ERP_INFO:
 561                         elems->erp_info = pos;
 562                         elems->erp_info_len = elen;
 563                         break;
 564                 case WLAN_EID_EXT_SUPP_RATES:
 565                         elems->ext_supp_rates = pos;
 566                         elems->ext_supp_rates_len = elen;
 567                         break;
 568                 case WLAN_EID_HT_CAPABILITY:
 569                         if (elen >= sizeof(struct ieee80211_ht_cap))
 570                                 elems->ht_cap_elem = (void *)pos;
 571                         break;
 572                 case WLAN_EID_HT_INFORMATION:
 573                         if (elen >= sizeof(struct ieee80211_ht_info))
 574                                 elems->ht_info_elem = (void *)pos;
 575                         break;
 576                 case WLAN_EID_MESH_ID:
 577                         elems->mesh_id = pos;
 578                         elems->mesh_id_len = elen;
 579                         break;
 580                 case WLAN_EID_MESH_CONFIG:
 581                         elems->mesh_config = pos;
 582                         elems->mesh_config_len = elen;
 583                         break;
 584                 case WLAN_EID_PEER_LINK:
 585                         elems->peer_link = pos;
 586                         elems->peer_link_len = elen;
 587                         break;
 588                 case WLAN_EID_PREQ:
 589                         elems->preq = pos;
 590                         elems->preq_len = elen;
 591                         break;
 592                 case WLAN_EID_PREP:
 593                         elems->prep = pos;
 594                         elems->prep_len = elen;
 595                         break;
 596                 case WLAN_EID_PERR:
 597                         elems->perr = pos;
 598                         elems->perr_len = elen;
 599                         break;
 600                 case WLAN_EID_CHANNEL_SWITCH:
 601                         elems->ch_switch_elem = pos;
 602                         elems->ch_switch_elem_len = elen;
 603                         break;
 604                 case WLAN_EID_QUIET:
 605                         if (!elems->quiet_elem) {
 606                                 elems->quiet_elem = pos;
 607                                 elems->quiet_elem_len = elen;
 608                         }
 609                         elems->num_of_quiet_elem++;
 610                         break;
 611                 case WLAN_EID_COUNTRY:
 612                         elems->country_elem = pos;
 613                         elems->country_elem_len = elen;
 614                         break;
 615                 case WLAN_EID_PWR_CONSTRAINT:
 616                         elems->pwr_constr_elem = pos;
 617                         elems->pwr_constr_elem_len = elen;
 618                         break;
 619                 case WLAN_EID_TIMEOUT_INTERVAL:
 620                         elems->timeout_int = pos;
 621                         elems->timeout_int_len = elen;
 622                         break;
 623                 default:
 624                         break;
 625                 }
 626
 627                 left -= elen;
 628                 pos += elen;
 629         }
 630
 631         return crc;
 632 }
 633
 634 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 635 {
 636         struct ieee80211_local *local = sdata->local;
 637         struct ieee80211_tx_queue_params qparam;
 638         int queue;
 639         bool use_11b;
 640         int aCWmin, aCWmax;
 641
 642         if (!local->ops->conf_tx)
 643                 return;
 644
 645         memset(&qparam, 0, sizeof(qparam));
 646
 647         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 648                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 649
 650         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 651                 /* Set defaults according to 802.11-2007 Table 7-37 */
 652                 aCWmax = 1023;
 653                 if (use_11b)
 654                         aCWmin = 31;
 655                 else
 656                         aCWmin = 15;
 657
 658                 switch (queue) {
 659                 case 3: /* AC_BK */
 660                         qparam.cw_max = aCWmax;
 661                         qparam.cw_min = aCWmin;
 662                         qparam.txop = 0;
 663                         qparam.aifs = 7;
 664                         break;
 665                 default: /* never happens but let's not leave undefined */
 666                 case 2: /* AC_BE */
 667                         qparam.cw_max = aCWmax;
 668                         qparam.cw_min = aCWmin;
 669                         qparam.txop = 0;
 670                         qparam.aifs = 3;
 671                         break;
 672                 case 1: /* AC_VI */
 673                         qparam.cw_max = aCWmin;
 674                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 675                         if (use_11b)
 676                                 qparam.txop = 6016/32;
 677                         else
 678                                 qparam.txop = 3008/32;
 679                         qparam.aifs = 2;
 680                         break;
 681                 case 0: /* AC_VO */
 682                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 683                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 684                         if (use_11b)
 685                                 qparam.txop = 3264/32;
 686                         else
 687                                 qparam.txop = 1504/32;
 688                         qparam.aifs = 2;
 689                         break;
 690                 }
 691
 692                 drv_conf_tx(local, queue, &qparam);
 693         }
 694 }
 695
 696 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 697                                   const size_t supp_rates_len,
 698                                   const u8 *supp_rates)
 699 {
 700         struct ieee80211_local *local = sdata->local;
 701         int i, have_higher_than_11mbit = 0;
 702
 703         /* cf. IEEE 802.11 9.2.12 */
 704         for (i = 0; i < supp_rates_len; i++)
 705                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 706                         have_higher_than_11mbit = 1;
 707
 708         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 709             have_higher_than_11mbit)
 710                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 711         else
 712                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 713
 714         ieee80211_set_wmm_default(sdata);
 715 }
 716
 717 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 718                       int encrypt)
 719 {
 720         skb->dev = sdata->local->mdev;
 721         skb_set_mac_header(skb, 0);
 722         skb_set_network_header(skb, 0);
 723         skb_set_transport_header(skb, 0);
 724
 725         skb->iif = sdata->dev->ifindex;
 726         skb->do_not_encrypt = !encrypt;
 727
 728         dev_queue_xmit(skb);
 729 }
 730
 731 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
 732 {
 733         int ret = -EINVAL;
 734         struct ieee80211_channel *chan;
 735         struct ieee80211_local *local = sdata->local;
 736
 737         chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
 738
 739         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
 740                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 741                     chan->flags & IEEE80211_CHAN_NO_IBSS)
 742                         return ret;
 743                 local->oper_channel = chan;
 744                 local->oper_channel_type = NL80211_CHAN_NO_HT;
 745
 746                 if (local->sw_scanning || local->hw_scanning)
 747                         ret = 0;
 748                 else
 749                         ret = ieee80211_hw_config(
 750                                 local, IEEE80211_CONF_CHANGE_CHANNEL);
 751         }
 752
 753         return ret;
 754 }
 755
 756 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 757                               enum ieee80211_band band)
 758 {
 759         struct ieee80211_supported_band *sband;
 760         struct ieee80211_rate *bitrates;
 761         u32 mandatory_rates;
 762         enum ieee80211_rate_flags mandatory_flag;
 763         int i;
 764
 765         sband = local->hw.wiphy->bands[band];
 766         if (!sband) {
 767                 WARN_ON(1);
 768                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 769         }
 770
 771         if (band == IEEE80211_BAND_2GHZ)
 772                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 773         else
 774                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 775
 776         bitrates = sband->bitrates;
 777         mandatory_rates = 0;
 778         for (i = 0; i < sband->n_bitrates; i++)
 779                 if (bitrates[i].flags & mandatory_flag)
 780                         mandatory_rates |= BIT(i);
 781         return mandatory_rates;
 782 }
 783
 784 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 785                          u16 transaction, u16 auth_alg,
 786                          u8 *extra, size_t extra_len,
 787                          const u8 *bssid, int encrypt)
 788 {
 789         struct ieee80211_local *local = sdata->local;
 790         struct sk_buff *skb;
 791         struct ieee80211_mgmt *mgmt;
 792
 793         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 794                             sizeof(*mgmt) + 6 + extra_len);
 795         if (!skb) {
 796                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 797                        "frame\n", sdata->dev->name);
 798                 return;
 799         }
 800         skb_reserve(skb, local->hw.extra_tx_headroom);
 801
 802         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 803         memset(mgmt, 0, 24 + 6);
 804         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 805                                           IEEE80211_STYPE_AUTH);
 806         if (encrypt)
 807                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 808         memcpy(mgmt->da, bssid, ETH_ALEN);
 809         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 810         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 811         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 812         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 813         mgmt->u.auth.status_code = cpu_to_le16(0);
 814         if (extra)
 815                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 816
 817         ieee80211_tx_skb(sdata, skb, encrypt);
 818 }
 819
 820 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 821                              const u8 *ie, size_t ie_len)
 822 {
 823         struct ieee80211_supported_band *sband;
 824         u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
 825         int i;
 826
 827         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 828
 829         pos = buffer;
 830
 831         *pos++ = WLAN_EID_SUPP_RATES;
 832         supp_rates_len = pos;
 833         *pos++ = 0;
 834
 835         for (i = 0; i < sband->n_bitrates; i++) {
 836                 struct ieee80211_rate *rate = &sband->bitrates[i];
 837
 838                 if (esupp_rates_len) {
 839                         *esupp_rates_len += 1;
 840                 } else if (*supp_rates_len == 8) {
 841                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
 842                         esupp_rates_len = pos;
 843                         *pos++ = 1;
 844                 } else
 845                         *supp_rates_len += 1;
 846
 847                 *pos++ = rate->bitrate / 5;
 848         }
 849
 850         if (sband->ht_cap.ht_supported) {
 851                 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
 852
 853                 *pos++ = WLAN_EID_HT_CAPABILITY;
 854                 *pos++ = sizeof(struct ieee80211_ht_cap);
 855                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 856                 memcpy(pos, &tmp, sizeof(u16));
 857                 pos += sizeof(u16);
 858                 /* TODO: needs a define here for << 2 */
 859                 *pos++ = sband->ht_cap.ampdu_factor |
 860                          (sband->ht_cap.ampdu_density << 2);
 861                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 862                 pos += sizeof(sband->ht_cap.mcs);
 863                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 864         }
 865
 866         /*
 867          * If adding more here, adjust code in main.c
 868          * that calculates local->scan_ies_len.
 869          */
 870
 871         if (ie) {
 872                 memcpy(pos, ie, ie_len);
 873                 pos += ie_len;
 874         }
 875
 876         return pos - buffer;
 877 }
 878
 879 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 880                               const u8 *ssid, size_t ssid_len,
 881                               const u8 *ie, size_t ie_len)
 882 {
 883         struct ieee80211_local *local = sdata->local;
 884         struct sk_buff *skb;
 885         struct ieee80211_mgmt *mgmt;
 886         u8 *pos;
 887
 888         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 889                             ie_len);
 890         if (!skb) {
 891                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 892                        "request\n", sdata->dev->name);
 893                 return;
 894         }
 895         skb_reserve(skb, local->hw.extra_tx_headroom);
 896
 897         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 898         memset(mgmt, 0, 24);
 899         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 900                                           IEEE80211_STYPE_PROBE_REQ);
 901         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 902         if (dst) {
 903                 memcpy(mgmt->da, dst, ETH_ALEN);
 904                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 905         } else {
 906                 memset(mgmt->da, 0xff, ETH_ALEN);
 907                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 908         }
 909         pos = skb_put(skb, 2 + ssid_len);
 910         *pos++ = WLAN_EID_SSID;
 911         *pos++ = ssid_len;
 912         memcpy(pos, ssid, ssid_len);
 913         pos += ssid_len;
 914
 915         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
 916
 917         ieee80211_tx_skb(sdata, skb, 0);
 918 }
 919
 920 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 921                             struct ieee802_11_elems *elems,
 922                             enum ieee80211_band band)
 923 {
 924         struct ieee80211_supported_band *sband;
 925         struct ieee80211_rate *bitrates;
 926         size_t num_rates;
 927         u32 supp_rates;
 928         int i, j;
 929         sband = local->hw.wiphy->bands[band];
 930
 931         if (!sband) {
 932                 WARN_ON(1);
 933                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 934         }
 935
 936         bitrates = sband->bitrates;
 937         num_rates = sband->n_bitrates;
 938         supp_rates = 0;
 939         for (i = 0; i < elems->supp_rates_len +
 940                      elems->ext_supp_rates_len; i++) {
 941                 u8 rate = 0;
 942                 int own_rate;
 943                 if (i < elems->supp_rates_len)
 944                         rate = elems->supp_rates[i];
 945                 else if (elems->ext_supp_rates)
 946                         rate = elems->ext_supp_rates
 947                                 [i - elems->supp_rates_len];
 948                 own_rate = 5 * (rate & 0x7f);
 949                 for (j = 0; j < num_rates; j++)
 950                         if (bitrates[j].bitrate == own_rate)
 951                                 supp_rates |= BIT(j);
 952         }
 953         return supp_rates;
 954 }
 955
 956 int ieee80211_reconfig(struct ieee80211_local *local)
 957 {
 958         struct ieee80211_hw *hw = &local->hw;
 959         struct ieee80211_sub_if_data *sdata;
 960         struct ieee80211_if_init_conf conf;
 961         struct sta_info *sta;
 962         unsigned long flags;
 963         int res;
 964         bool from_suspend = local->suspended;
 965
 966         /*
 967          * We're going to start the hardware, at that point
 968          * we are no longer suspended and can RX frames.
 969          */
 970         local->suspended = false;
 971
 972         /* restart hardware */
 973         if (local->open_count) {
 974                 res = drv_start(local);
 975
 976                 ieee80211_led_radio(local, true);
 977         }
 978
 979         /* add interfaces */
 980         list_for_each_entry(sdata, &local->interfaces, list) {
 981                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 982                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 983                     netif_running(sdata->dev)) {
 984                         conf.vif = &sdata->vif;
 985                         conf.type = sdata->vif.type;
 986                         conf.mac_addr = sdata->dev->dev_addr;
 987                         res = drv_add_interface(local, &conf);
 988                 }
 989         }
 990
 991         /* add STAs back */
 992         if (local->ops->sta_notify) {
 993                 spin_lock_irqsave(&local->sta_lock, flags);
 994                 list_for_each_entry(sta, &local->sta_list, list) {
 995                         sdata = sta->sdata;
 996                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 997                                 sdata = container_of(sdata->bss,
 998                                              struct ieee80211_sub_if_data,
 999                                              u.ap);
1000
1001                         drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1002                                        &sta->sta);
1003                 }
1004                 spin_unlock_irqrestore(&local->sta_lock, flags);
1005         }
1006
1007         /* Clear Suspend state so that ADDBA requests can be processed */
1008
1009         rcu_read_lock();
1010
1011         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1012                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1013                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1014                 }
1015         }
1016
1017         rcu_read_unlock();
1018
1019         /* setup RTS threshold */
1020         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1021
1022         /* reconfigure hardware */
1023         ieee80211_hw_config(local, ~0);
1024
1025         netif_addr_lock_bh(local->mdev);
1026         ieee80211_configure_filter(local);
1027         netif_addr_unlock_bh(local->mdev);
1028
1029         /* Finally also reconfigure all the BSS information */
1030         list_for_each_entry(sdata, &local->interfaces, list) {
1031                 u32 changed = ~0;
1032                 if (!netif_running(sdata->dev))
1033                         continue;
1034                 switch (sdata->vif.type) {
1035                 case NL80211_IFTYPE_STATION:
1036                         /* disable beacon change bits */
1037                         changed &= ~(BSS_CHANGED_BEACON |
1038                                      BSS_CHANGED_BEACON_ENABLED);
1039                         /* fall through */
1040                 case NL80211_IFTYPE_ADHOC:
1041                 case NL80211_IFTYPE_AP:
1042                 case NL80211_IFTYPE_MESH_POINT:
1043                         ieee80211_bss_info_change_notify(sdata, changed);
1044                         break;
1045                 case NL80211_IFTYPE_WDS:
1046                         break;
1047                 case NL80211_IFTYPE_AP_VLAN:
1048                 case NL80211_IFTYPE_MONITOR:
1049                         /* ignore virtual */
1050                         break;
1051                 case NL80211_IFTYPE_UNSPECIFIED:
1052                 case __NL80211_IFTYPE_AFTER_LAST:
1053                         WARN_ON(1);
1054                         break;
1055                 }
1056         }
1057
1058         /* add back keys */
1059         list_for_each_entry(sdata, &local->interfaces, list)
1060                 if (netif_running(sdata->dev))
1061                         ieee80211_enable_keys(sdata);
1062
1063         ieee80211_wake_queues_by_reason(hw,
1064                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1065
1066         /*
1067          * If this is for hw restart things are still running.
1068          * We may want to change that later, however.
1069          */
1070         if (!from_suspend)
1071                 return 0;
1072
1073 #ifdef CONFIG_PM
1074         local->suspended = false;
1075
1076         list_for_each_entry(sdata, &local->interfaces, list) {
1077                 switch(sdata->vif.type) {
1078                 case NL80211_IFTYPE_STATION:
1079                         ieee80211_sta_restart(sdata);
1080                         break;
1081                 case NL80211_IFTYPE_ADHOC:
1082                         ieee80211_ibss_restart(sdata);
1083                         break;
1084                 case NL80211_IFTYPE_MESH_POINT:
1085                         ieee80211_mesh_restart(sdata);
1086                         break;
1087                 default:
1088                         break;
1089                 }
1090         }
1091
1092         add_timer(&local->sta_cleanup);
1093
1094         spin_lock_irqsave(&local->sta_lock, flags);
1095         list_for_each_entry(sta, &local->sta_list, list)
1096                 mesh_plink_restart(sta);
1097         spin_unlock_irqrestore(&local->sta_lock, flags);
1098 #else
1099         WARN_ON(1);
1100 #endif
1101         return 0;
1102 }