net/mac80211/util.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * utilities for mac80211
  12  */
  13
  14 #include <net/mac80211.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/crc32.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/rtnetlink.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wme.h"
  33 #include "led.h"
  34 #include "wep.h"
  35
  36 /* privid for wiphys to determine whether they belong to us or not */
  37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  38
  39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  40 {
  41         struct ieee80211_local *local;
  42         BUG_ON(!wiphy);
  43
  44         local = wiphy_priv(wiphy);
  45         return &local->hw;
  46 }
  47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  48
  49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  50                         enum nl80211_iftype type)
  51 {
  52         __le16 fc = hdr->frame_control;
  53
  54          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  55         if (len < 16)
  56                 return NULL;
  57
  58         if (ieee80211_is_data(fc)) {
  59                 if (len < 24) /* drop incorrect hdr len (data) */
  60                         return NULL;
  61
  62                 if (ieee80211_has_a4(fc))
  63                         return NULL;
  64                 if (ieee80211_has_tods(fc))
  65                         return hdr->addr1;
  66                 if (ieee80211_has_fromds(fc))
  67                         return hdr->addr2;
  68
  69                 return hdr->addr3;
  70         }
  71
  72         if (ieee80211_is_mgmt(fc)) {
  73                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  74                         return NULL;
  75                 return hdr->addr3;
  76         }
  77
  78         if (ieee80211_is_ctl(fc)) {
  79                 if(ieee80211_is_pspoll(fc))
  80                         return hdr->addr1;
  81
  82                 if (ieee80211_is_back_req(fc)) {
  83                         switch (type) {
  84                         case NL80211_IFTYPE_STATION:
  85                                 return hdr->addr2;
  86                         case NL80211_IFTYPE_AP:
  87                         case NL80211_IFTYPE_AP_VLAN:
  88                                 return hdr->addr1;
  89                         default:
  90                                 break; /* fall through to the return */
  91                         }
  92                 }
  93         }
  94
  95         return NULL;
  96 }
  97
  98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  99 {
 100         struct sk_buff *skb = tx->skb;
 101         struct ieee80211_hdr *hdr;
 102
 103         do {
 104                 hdr = (struct ieee80211_hdr *) skb->data;
 105                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 106         } while ((skb = skb->next));
 107 }
 108
 109 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 110                              int rate, int erp, int short_preamble)
 111 {
 112         int dur;
 113
 114         /* calculate duration (in microseconds, rounded up to next higher
 115          * integer if it includes a fractional microsecond) to send frame of
 116          * len bytes (does not include FCS) at the given rate. Duration will
 117          * also include SIFS.
 118          *
 119          * rate is in 100 kbps, so divident is multiplied by 10 in the
 120          * DIV_ROUND_UP() operations.
 121          */
 122
 123         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 124                 /*
 125                  * OFDM:
 126                  *
 127                  * N_DBPS = DATARATE x 4
 128                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 129                  *      (16 = SIGNAL time, 6 = tail bits)
 130                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 131                  *
 132                  * T_SYM = 4 usec
 133                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 134                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 135                  *      signal ext = 6 usec
 136                  */
 137                 dur = 16; /* SIFS + signal ext */
 138                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 139                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 140                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 141                                         4 * rate); /* T_SYM x N_SYM */
 142         } else {
 143                 /*
 144                  * 802.11b or 802.11g with 802.11b compatibility:
 145                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 146                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 147                  *
 148                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 149                  * aSIFSTime = 10 usec
 150                  * aPreambleLength = 144 usec or 72 usec with short preamble
 151                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 152                  */
 153                 dur = 10; /* aSIFSTime = 10 usec */
 154                 dur += short_preamble ? (72 + 24) : (144 + 48);
 155
 156                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 157         }
 158
 159         return dur;
 160 }
 161
 162 /* Exported duration function for driver use */
 163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 164                                         struct ieee80211_vif *vif,
 165                                         size_t frame_len,
 166                                         struct ieee80211_rate *rate)
 167 {
 168         struct ieee80211_local *local = hw_to_local(hw);
 169         struct ieee80211_sub_if_data *sdata;
 170         u16 dur;
 171         int erp;
 172         bool short_preamble = false;
 173
 174         erp = 0;
 175         if (vif) {
 176                 sdata = vif_to_sdata(vif);
 177                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 178                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 179                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 180         }
 181
 182         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 183                                        short_preamble);
 184
 185         return cpu_to_le16(dur);
 186 }
 187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 188
 189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 190                               struct ieee80211_vif *vif, size_t frame_len,
 191                               const struct ieee80211_tx_info *frame_txctl)
 192 {
 193         struct ieee80211_local *local = hw_to_local(hw);
 194         struct ieee80211_rate *rate;
 195         struct ieee80211_sub_if_data *sdata;
 196         bool short_preamble;
 197         int erp;
 198         u16 dur;
 199         struct ieee80211_supported_band *sband;
 200
 201         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 202
 203         short_preamble = false;
 204
 205         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 206
 207         erp = 0;
 208         if (vif) {
 209                 sdata = vif_to_sdata(vif);
 210                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 211                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 212                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 213         }
 214
 215         /* CTS duration */
 216         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 217                                        erp, short_preamble);
 218         /* Data frame duration */
 219         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 220                                         erp, short_preamble);
 221         /* ACK duration */
 222         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 223                                         erp, short_preamble);
 224
 225         return cpu_to_le16(dur);
 226 }
 227 EXPORT_SYMBOL(ieee80211_rts_duration);
 228
 229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 230                                     struct ieee80211_vif *vif,
 231                                     size_t frame_len,
 232                                     const struct ieee80211_tx_info *frame_txctl)
 233 {
 234         struct ieee80211_local *local = hw_to_local(hw);
 235         struct ieee80211_rate *rate;
 236         struct ieee80211_sub_if_data *sdata;
 237         bool short_preamble;
 238         int erp;
 239         u16 dur;
 240         struct ieee80211_supported_band *sband;
 241
 242         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 243
 244         short_preamble = false;
 245
 246         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 247         erp = 0;
 248         if (vif) {
 249                 sdata = vif_to_sdata(vif);
 250                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 251                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 252                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 253         }
 254
 255         /* Data frame duration */
 256         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 257                                        erp, short_preamble);
 258         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 259                 /* ACK duration */
 260                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 261                                                 erp, short_preamble);
 262         }
 263
 264         return cpu_to_le16(dur);
 265 }
 266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 269                                    enum queue_stop_reason reason)
 270 {
 271         struct ieee80211_local *local = hw_to_local(hw);
 272
 273         if (WARN_ON(queue >= hw->queues))
 274                 return;
 275
 276         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 277
 278         if (local->queue_stop_reasons[queue] != 0)
 279                 /* someone still has this queue stopped */
 280                 return;
 281
 282         if (!skb_queue_empty(&local->pending[queue]))
 283                 tasklet_schedule(&local->tx_pending_tasklet);
 284 }
 285
 286 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 287                                     enum queue_stop_reason reason)
 288 {
 289         struct ieee80211_local *local = hw_to_local(hw);
 290         unsigned long flags;
 291
 292         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 293         __ieee80211_wake_queue(hw, queue, reason);
 294         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 295 }
 296
 297 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 298 {
 299         ieee80211_wake_queue_by_reason(hw, queue,
 300                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 301 }
 302 EXPORT_SYMBOL(ieee80211_wake_queue);
 303
 304 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 305                                    enum queue_stop_reason reason)
 306 {
 307         struct ieee80211_local *local = hw_to_local(hw);
 308
 309         if (WARN_ON(queue >= hw->queues))
 310                 return;
 311
 312         __set_bit(reason, &local->queue_stop_reasons[queue]);
 313 }
 314
 315 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 316                                     enum queue_stop_reason reason)
 317 {
 318         struct ieee80211_local *local = hw_to_local(hw);
 319         unsigned long flags;
 320
 321         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 322         __ieee80211_stop_queue(hw, queue, reason);
 323         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 324 }
 325
 326 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 327 {
 328         ieee80211_stop_queue_by_reason(hw, queue,
 329                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 330 }
 331 EXPORT_SYMBOL(ieee80211_stop_queue);
 332
 333 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 334                                struct sk_buff *skb)
 335 {
 336         struct ieee80211_hw *hw = &local->hw;
 337         unsigned long flags;
 338         int queue = skb_get_queue_mapping(skb);
 339         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 340
 341         if (WARN_ON(!info->control.vif)) {
 342                 kfree(skb);
 343                 return;
 344         }
 345
 346         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 347         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 348         __skb_queue_tail(&local->pending[queue], skb);
 349         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 350         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 351 }
 352
 353 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 354                                struct sk_buff_head *skbs)
 355 {
 356         struct ieee80211_hw *hw = &local->hw;
 357         struct sk_buff *skb;
 358         unsigned long flags;
 359         int queue, ret = 0, i;
 360
 361         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 362         for (i = 0; i < hw->queues; i++)
 363                 __ieee80211_stop_queue(hw, i,
 364                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 365
 366         while ((skb = skb_dequeue(skbs))) {
 367                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 368
 369                 if (WARN_ON(!info->control.vif)) {
 370                         kfree(skb);
 371                         continue;
 372                 }
 373
 374                 ret++;
 375                 queue = skb_get_queue_mapping(skb);
 376                 __skb_queue_tail(&local->pending[queue], skb);
 377         }
 378
 379         for (i = 0; i < hw->queues; i++)
 380                 __ieee80211_wake_queue(hw, i,
 381                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 382         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 383
 384         return ret;
 385 }
 386
 387 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 388                                     enum queue_stop_reason reason)
 389 {
 390         struct ieee80211_local *local = hw_to_local(hw);
 391         unsigned long flags;
 392         int i;
 393
 394         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 395
 396         for (i = 0; i < hw->queues; i++)
 397                 __ieee80211_stop_queue(hw, i, reason);
 398
 399         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 400 }
 401
 402 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 403 {
 404         ieee80211_stop_queues_by_reason(hw,
 405                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 406 }
 407 EXPORT_SYMBOL(ieee80211_stop_queues);
 408
 409 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 410 {
 411         struct ieee80211_local *local = hw_to_local(hw);
 412         unsigned long flags;
 413         int ret;
 414
 415         if (WARN_ON(queue >= hw->queues))
 416                 return true;
 417
 418         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 419         ret = !!local->queue_stop_reasons[queue];
 420         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 421         return ret;
 422 }
 423 EXPORT_SYMBOL(ieee80211_queue_stopped);
 424
 425 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 426                                      enum queue_stop_reason reason)
 427 {
 428         struct ieee80211_local *local = hw_to_local(hw);
 429         unsigned long flags;
 430         int i;
 431
 432         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 433
 434         for (i = 0; i < hw->queues; i++)
 435                 __ieee80211_wake_queue(hw, i, reason);
 436
 437         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 438 }
 439
 440 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 441 {
 442         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 443 }
 444 EXPORT_SYMBOL(ieee80211_wake_queues);
 445
 446 void ieee80211_iterate_active_interfaces(
 447         struct ieee80211_hw *hw,
 448         void (*iterator)(void *data, u8 *mac,
 449                          struct ieee80211_vif *vif),
 450         void *data)
 451 {
 452         struct ieee80211_local *local = hw_to_local(hw);
 453         struct ieee80211_sub_if_data *sdata;
 454
 455         mutex_lock(&local->iflist_mtx);
 456
 457         list_for_each_entry(sdata, &local->interfaces, list) {
 458                 switch (sdata->vif.type) {
 459                 case __NL80211_IFTYPE_AFTER_LAST:
 460                 case NL80211_IFTYPE_UNSPECIFIED:
 461                 case NL80211_IFTYPE_MONITOR:
 462                 case NL80211_IFTYPE_AP_VLAN:
 463                         continue;
 464                 case NL80211_IFTYPE_AP:
 465                 case NL80211_IFTYPE_STATION:
 466                 case NL80211_IFTYPE_ADHOC:
 467                 case NL80211_IFTYPE_WDS:
 468                 case NL80211_IFTYPE_MESH_POINT:
 469                         break;
 470                 }
 471                 if (netif_running(sdata->dev))
 472                         iterator(data, sdata->dev->dev_addr,
 473                                  &sdata->vif);
 474         }
 475
 476         mutex_unlock(&local->iflist_mtx);
 477 }
 478 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 479
 480 void ieee80211_iterate_active_interfaces_atomic(
 481         struct ieee80211_hw *hw,
 482         void (*iterator)(void *data, u8 *mac,
 483                          struct ieee80211_vif *vif),
 484         void *data)
 485 {
 486         struct ieee80211_local *local = hw_to_local(hw);
 487         struct ieee80211_sub_if_data *sdata;
 488
 489         rcu_read_lock();
 490
 491         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 492                 switch (sdata->vif.type) {
 493                 case __NL80211_IFTYPE_AFTER_LAST:
 494                 case NL80211_IFTYPE_UNSPECIFIED:
 495                 case NL80211_IFTYPE_MONITOR:
 496                 case NL80211_IFTYPE_AP_VLAN:
 497                         continue;
 498                 case NL80211_IFTYPE_AP:
 499                 case NL80211_IFTYPE_STATION:
 500                 case NL80211_IFTYPE_ADHOC:
 501                 case NL80211_IFTYPE_WDS:
 502                 case NL80211_IFTYPE_MESH_POINT:
 503                         break;
 504                 }
 505                 if (netif_running(sdata->dev))
 506                         iterator(data, sdata->dev->dev_addr,
 507                                  &sdata->vif);
 508         }
 509
 510         rcu_read_unlock();
 511 }
 512 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 513
 514 void ieee802_11_parse_elems(u8 *start, size_t len,
 515                             struct ieee802_11_elems *elems)
 516 {
 517         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 518 }
 519
 520 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 521                                struct ieee802_11_elems *elems,
 522                                u64 filter, u32 crc)
 523 {
 524         size_t left = len;
 525         u8 *pos = start;
 526         bool calc_crc = filter != 0;
 527
 528         memset(elems, 0, sizeof(*elems));
 529         elems->ie_start = start;
 530         elems->total_len = len;
 531
 532         while (left >= 2) {
 533                 u8 id, elen;
 534
 535                 id = *pos++;
 536                 elen = *pos++;
 537                 left -= 2;
 538
 539                 if (elen > left)
 540                         break;
 541
 542                 if (calc_crc && id < 64 && (filter & BIT(id)))
 543                         crc = crc32_be(crc, pos - 2, elen + 2);
 544
 545                 switch (id) {
 546                 case WLAN_EID_SSID:
 547                         elems->ssid = pos;
 548                         elems->ssid_len = elen;
 549                         break;
 550                 case WLAN_EID_SUPP_RATES:
 551                         elems->supp_rates = pos;
 552                         elems->supp_rates_len = elen;
 553                         break;
 554                 case WLAN_EID_FH_PARAMS:
 555                         elems->fh_params = pos;
 556                         elems->fh_params_len = elen;
 557                         break;
 558                 case WLAN_EID_DS_PARAMS:
 559                         elems->ds_params = pos;
 560                         elems->ds_params_len = elen;
 561                         break;
 562                 case WLAN_EID_CF_PARAMS:
 563                         elems->cf_params = pos;
 564                         elems->cf_params_len = elen;
 565                         break;
 566                 case WLAN_EID_TIM:
 567                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 568                                 elems->tim = (void *)pos;
 569                                 elems->tim_len = elen;
 570                         }
 571                         break;
 572                 case WLAN_EID_IBSS_PARAMS:
 573                         elems->ibss_params = pos;
 574                         elems->ibss_params_len = elen;
 575                         break;
 576                 case WLAN_EID_CHALLENGE:
 577                         elems->challenge = pos;
 578                         elems->challenge_len = elen;
 579                         break;
 580                 case WLAN_EID_VENDOR_SPECIFIC:
 581                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 582                             pos[2] == 0xf2) {
 583                                 /* Microsoft OUI (00:50:F2) */
 584
 585                                 if (calc_crc)
 586                                         crc = crc32_be(crc, pos - 2, elen + 2);
 587
 588                                 if (pos[3] == 1) {
 589                                         /* OUI Type 1 - WPA IE */
 590                                         elems->wpa = pos;
 591                                         elems->wpa_len = elen;
 592                                 } else if (elen >= 5 && pos[3] == 2) {
 593                                         /* OUI Type 2 - WMM IE */
 594                                         if (pos[4] == 0) {
 595                                                 elems->wmm_info = pos;
 596                                                 elems->wmm_info_len = elen;
 597                                         } else if (pos[4] == 1) {
 598                                                 elems->wmm_param = pos;
 599                                                 elems->wmm_param_len = elen;
 600                                         }
 601                                 }
 602                         }
 603                         break;
 604                 case WLAN_EID_RSN:
 605                         elems->rsn = pos;
 606                         elems->rsn_len = elen;
 607                         break;
 608                 case WLAN_EID_ERP_INFO:
 609                         elems->erp_info = pos;
 610                         elems->erp_info_len = elen;
 611                         break;
 612                 case WLAN_EID_EXT_SUPP_RATES:
 613                         elems->ext_supp_rates = pos;
 614                         elems->ext_supp_rates_len = elen;
 615                         break;
 616                 case WLAN_EID_HT_CAPABILITY:
 617                         if (elen >= sizeof(struct ieee80211_ht_cap))
 618                                 elems->ht_cap_elem = (void *)pos;
 619                         break;
 620                 case WLAN_EID_HT_INFORMATION:
 621                         if (elen >= sizeof(struct ieee80211_ht_info))
 622                                 elems->ht_info_elem = (void *)pos;
 623                         break;
 624                 case WLAN_EID_MESH_ID:
 625                         elems->mesh_id = pos;
 626                         elems->mesh_id_len = elen;
 627                         break;
 628                 case WLAN_EID_MESH_CONFIG:
 629                         elems->mesh_config = pos;
 630                         elems->mesh_config_len = elen;
 631                         break;
 632                 case WLAN_EID_PEER_LINK:
 633                         elems->peer_link = pos;
 634                         elems->peer_link_len = elen;
 635                         break;
 636                 case WLAN_EID_PREQ:
 637                         elems->preq = pos;
 638                         elems->preq_len = elen;
 639                         break;
 640                 case WLAN_EID_PREP:
 641                         elems->prep = pos;
 642                         elems->prep_len = elen;
 643                         break;
 644                 case WLAN_EID_PERR:
 645                         elems->perr = pos;
 646                         elems->perr_len = elen;
 647                         break;
 648                 case WLAN_EID_CHANNEL_SWITCH:
 649                         elems->ch_switch_elem = pos;
 650                         elems->ch_switch_elem_len = elen;
 651                         break;
 652                 case WLAN_EID_QUIET:
 653                         if (!elems->quiet_elem) {
 654                                 elems->quiet_elem = pos;
 655                                 elems->quiet_elem_len = elen;
 656                         }
 657                         elems->num_of_quiet_elem++;
 658                         break;
 659                 case WLAN_EID_COUNTRY:
 660                         elems->country_elem = pos;
 661                         elems->country_elem_len = elen;
 662                         break;
 663                 case WLAN_EID_PWR_CONSTRAINT:
 664                         elems->pwr_constr_elem = pos;
 665                         elems->pwr_constr_elem_len = elen;
 666                         break;
 667                 case WLAN_EID_TIMEOUT_INTERVAL:
 668                         elems->timeout_int = pos;
 669                         elems->timeout_int_len = elen;
 670                         break;
 671                 default:
 672                         break;
 673                 }
 674
 675                 left -= elen;
 676                 pos += elen;
 677         }
 678
 679         return crc;
 680 }
 681
 682 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 683 {
 684         struct ieee80211_local *local = sdata->local;
 685         struct ieee80211_tx_queue_params qparam;
 686         int queue;
 687         bool use_11b;
 688         int aCWmin, aCWmax;
 689
 690         if (!local->ops->conf_tx)
 691                 return;
 692
 693         memset(&qparam, 0, sizeof(qparam));
 694
 695         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 696                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 697
 698         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 699                 /* Set defaults according to 802.11-2007 Table 7-37 */
 700                 aCWmax = 1023;
 701                 if (use_11b)
 702                         aCWmin = 31;
 703                 else
 704                         aCWmin = 15;
 705
 706                 switch (queue) {
 707                 case 3: /* AC_BK */
 708                         qparam.cw_max = aCWmax;
 709                         qparam.cw_min = aCWmin;
 710                         qparam.txop = 0;
 711                         qparam.aifs = 7;
 712                         break;
 713                 default: /* never happens but let's not leave undefined */
 714                 case 2: /* AC_BE */
 715                         qparam.cw_max = aCWmax;
 716                         qparam.cw_min = aCWmin;
 717                         qparam.txop = 0;
 718                         qparam.aifs = 3;
 719                         break;
 720                 case 1: /* AC_VI */
 721                         qparam.cw_max = aCWmin;
 722                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 723                         if (use_11b)
 724                                 qparam.txop = 6016/32;
 725                         else
 726                                 qparam.txop = 3008/32;
 727                         qparam.aifs = 2;
 728                         break;
 729                 case 0: /* AC_VO */
 730                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 731                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 732                         if (use_11b)
 733                                 qparam.txop = 3264/32;
 734                         else
 735                                 qparam.txop = 1504/32;
 736                         qparam.aifs = 2;
 737                         break;
 738                 }
 739
 740                 drv_conf_tx(local, queue, &qparam);
 741         }
 742 }
 743
 744 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 745                                   const size_t supp_rates_len,
 746                                   const u8 *supp_rates)
 747 {
 748         struct ieee80211_local *local = sdata->local;
 749         int i, have_higher_than_11mbit = 0;
 750
 751         /* cf. IEEE 802.11 9.2.12 */
 752         for (i = 0; i < supp_rates_len; i++)
 753                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 754                         have_higher_than_11mbit = 1;
 755
 756         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 757             have_higher_than_11mbit)
 758                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 759         else
 760                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 761
 762         ieee80211_set_wmm_default(sdata);
 763 }
 764
 765 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 766                               enum ieee80211_band band)
 767 {
 768         struct ieee80211_supported_band *sband;
 769         struct ieee80211_rate *bitrates;
 770         u32 mandatory_rates;
 771         enum ieee80211_rate_flags mandatory_flag;
 772         int i;
 773
 774         sband = local->hw.wiphy->bands[band];
 775         if (!sband) {
 776                 WARN_ON(1);
 777                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 778         }
 779
 780         if (band == IEEE80211_BAND_2GHZ)
 781                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 782         else
 783                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 784
 785         bitrates = sband->bitrates;
 786         mandatory_rates = 0;
 787         for (i = 0; i < sband->n_bitrates; i++)
 788                 if (bitrates[i].flags & mandatory_flag)
 789                         mandatory_rates |= BIT(i);
 790         return mandatory_rates;
 791 }
 792
 793 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 794                          u16 transaction, u16 auth_alg,
 795                          u8 *extra, size_t extra_len, const u8 *bssid,
 796                          const u8 *key, u8 key_len, u8 key_idx)
 797 {
 798         struct ieee80211_local *local = sdata->local;
 799         struct sk_buff *skb;
 800         struct ieee80211_mgmt *mgmt;
 801         int err;
 802
 803         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 804                             sizeof(*mgmt) + 6 + extra_len);
 805         if (!skb) {
 806                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 807                        "frame\n", sdata->dev->name);
 808                 return;
 809         }
 810         skb_reserve(skb, local->hw.extra_tx_headroom);
 811
 812         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 813         memset(mgmt, 0, 24 + 6);
 814         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 815                                           IEEE80211_STYPE_AUTH);
 816         memcpy(mgmt->da, bssid, ETH_ALEN);
 817         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 818         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 819         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 820         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 821         mgmt->u.auth.status_code = cpu_to_le16(0);
 822         if (extra)
 823                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 824
 825         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 826                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 827                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 828                 WARN_ON(err);
 829         }
 830
 831         ieee80211_tx_skb(sdata, skb, 0);
 832 }
 833
 834 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 835                              const u8 *ie, size_t ie_len)
 836 {
 837         struct ieee80211_supported_band *sband;
 838         u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
 839         int i;
 840
 841         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 842
 843         pos = buffer;
 844
 845         *pos++ = WLAN_EID_SUPP_RATES;
 846         supp_rates_len = pos;
 847         *pos++ = 0;
 848
 849         for (i = 0; i < sband->n_bitrates; i++) {
 850                 struct ieee80211_rate *rate = &sband->bitrates[i];
 851
 852                 if (esupp_rates_len) {
 853                         *esupp_rates_len += 1;
 854                 } else if (*supp_rates_len == 8) {
 855                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
 856                         esupp_rates_len = pos;
 857                         *pos++ = 1;
 858                 } else
 859                         *supp_rates_len += 1;
 860
 861                 *pos++ = rate->bitrate / 5;
 862         }
 863
 864         if (sband->ht_cap.ht_supported) {
 865                 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
 866
 867                 *pos++ = WLAN_EID_HT_CAPABILITY;
 868                 *pos++ = sizeof(struct ieee80211_ht_cap);
 869                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 870                 memcpy(pos, &tmp, sizeof(u16));
 871                 pos += sizeof(u16);
 872                 /* TODO: needs a define here for << 2 */
 873                 *pos++ = sband->ht_cap.ampdu_factor |
 874                          (sband->ht_cap.ampdu_density << 2);
 875                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 876                 pos += sizeof(sband->ht_cap.mcs);
 877                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 878         }
 879
 880         /*
 881          * If adding more here, adjust code in main.c
 882          * that calculates local->scan_ies_len.
 883          */
 884
 885         if (ie) {
 886                 memcpy(pos, ie, ie_len);
 887                 pos += ie_len;
 888         }
 889
 890         return pos - buffer;
 891 }
 892
 893 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 894                               const u8 *ssid, size_t ssid_len,
 895                               const u8 *ie, size_t ie_len)
 896 {
 897         struct ieee80211_local *local = sdata->local;
 898         struct sk_buff *skb;
 899         struct ieee80211_mgmt *mgmt;
 900         u8 *pos;
 901
 902         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 903                             ie_len);
 904         if (!skb) {
 905                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 906                        "request\n", sdata->dev->name);
 907                 return;
 908         }
 909         skb_reserve(skb, local->hw.extra_tx_headroom);
 910
 911         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 912         memset(mgmt, 0, 24);
 913         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 914                                           IEEE80211_STYPE_PROBE_REQ);
 915         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 916         if (dst) {
 917                 memcpy(mgmt->da, dst, ETH_ALEN);
 918                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 919         } else {
 920                 memset(mgmt->da, 0xff, ETH_ALEN);
 921                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 922         }
 923         pos = skb_put(skb, 2 + ssid_len);
 924         *pos++ = WLAN_EID_SSID;
 925         *pos++ = ssid_len;
 926         memcpy(pos, ssid, ssid_len);
 927         pos += ssid_len;
 928
 929         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
 930
 931         ieee80211_tx_skb(sdata, skb, 0);
 932 }
 933
 934 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 935                             struct ieee802_11_elems *elems,
 936                             enum ieee80211_band band)
 937 {
 938         struct ieee80211_supported_band *sband;
 939         struct ieee80211_rate *bitrates;
 940         size_t num_rates;
 941         u32 supp_rates;
 942         int i, j;
 943         sband = local->hw.wiphy->bands[band];
 944
 945         if (!sband) {
 946                 WARN_ON(1);
 947                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 948         }
 949
 950         bitrates = sband->bitrates;
 951         num_rates = sband->n_bitrates;
 952         supp_rates = 0;
 953         for (i = 0; i < elems->supp_rates_len +
 954                      elems->ext_supp_rates_len; i++) {
 955                 u8 rate = 0;
 956                 int own_rate;
 957                 if (i < elems->supp_rates_len)
 958                         rate = elems->supp_rates[i];
 959                 else if (elems->ext_supp_rates)
 960                         rate = elems->ext_supp_rates
 961                                 [i - elems->supp_rates_len];
 962                 own_rate = 5 * (rate & 0x7f);
 963                 for (j = 0; j < num_rates; j++)
 964                         if (bitrates[j].bitrate == own_rate)
 965                                 supp_rates |= BIT(j);
 966         }
 967         return supp_rates;
 968 }
 969
 970 int ieee80211_reconfig(struct ieee80211_local *local)
 971 {
 972         struct ieee80211_hw *hw = &local->hw;
 973         struct ieee80211_sub_if_data *sdata;
 974         struct ieee80211_if_init_conf conf;
 975         struct sta_info *sta;
 976         unsigned long flags;
 977         int res;
 978         bool from_suspend = local->suspended;
 979
 980         /*
 981          * We're going to start the hardware, at that point
 982          * we are no longer suspended and can RX frames.
 983          */
 984         local->suspended = false;
 985
 986         /* restart hardware */
 987         if (local->open_count) {
 988                 res = drv_start(local);
 989
 990                 ieee80211_led_radio(local, true);
 991         }
 992
 993         /* add interfaces */
 994         list_for_each_entry(sdata, &local->interfaces, list) {
 995                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 996                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 997                     netif_running(sdata->dev)) {
 998                         conf.vif = &sdata->vif;
 999                         conf.type = sdata->vif.type;
1000                         conf.mac_addr = sdata->dev->dev_addr;
1001                         res = drv_add_interface(local, &conf);
1002                 }
1003         }
1004
1005         /* add STAs back */
1006         if (local->ops->sta_notify) {
1007                 spin_lock_irqsave(&local->sta_lock, flags);
1008                 list_for_each_entry(sta, &local->sta_list, list) {
1009                         sdata = sta->sdata;
1010                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1011                                 sdata = container_of(sdata->bss,
1012                                              struct ieee80211_sub_if_data,
1013                                              u.ap);
1014
1015                         drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1016                                        &sta->sta);
1017                 }
1018                 spin_unlock_irqrestore(&local->sta_lock, flags);
1019         }
1020
1021         /* Clear Suspend state so that ADDBA requests can be processed */
1022
1023         rcu_read_lock();
1024
1025         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1026                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1027                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1028                 }
1029         }
1030
1031         rcu_read_unlock();
1032
1033         /* setup RTS threshold */
1034         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1035
1036         /* reconfigure hardware */
1037         ieee80211_hw_config(local, ~0);
1038
1039         spin_lock_bh(&local->filter_lock);
1040         ieee80211_configure_filter(local);
1041         spin_unlock_bh(&local->filter_lock);
1042
1043         /* Finally also reconfigure all the BSS information */
1044         list_for_each_entry(sdata, &local->interfaces, list) {
1045                 u32 changed = ~0;
1046                 if (!netif_running(sdata->dev))
1047                         continue;
1048                 switch (sdata->vif.type) {
1049                 case NL80211_IFTYPE_STATION:
1050                         /* disable beacon change bits */
1051                         changed &= ~(BSS_CHANGED_BEACON |
1052                                      BSS_CHANGED_BEACON_ENABLED);
1053                         /* fall through */
1054                 case NL80211_IFTYPE_ADHOC:
1055                 case NL80211_IFTYPE_AP:
1056                 case NL80211_IFTYPE_MESH_POINT:
1057                         ieee80211_bss_info_change_notify(sdata, changed);
1058                         break;
1059                 case NL80211_IFTYPE_WDS:
1060                         break;
1061                 case NL80211_IFTYPE_AP_VLAN:
1062                 case NL80211_IFTYPE_MONITOR:
1063                         /* ignore virtual */
1064                         break;
1065                 case NL80211_IFTYPE_UNSPECIFIED:
1066                 case __NL80211_IFTYPE_AFTER_LAST:
1067                         WARN_ON(1);
1068                         break;
1069                 }
1070         }
1071
1072         /* add back keys */
1073         list_for_each_entry(sdata, &local->interfaces, list)
1074                 if (netif_running(sdata->dev))
1075                         ieee80211_enable_keys(sdata);
1076
1077         ieee80211_wake_queues_by_reason(hw,
1078                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1079
1080         /*
1081          * If this is for hw restart things are still running.
1082          * We may want to change that later, however.
1083          */
1084         if (!from_suspend)
1085                 return 0;
1086
1087 #ifdef CONFIG_PM
1088         local->suspended = false;
1089
1090         list_for_each_entry(sdata, &local->interfaces, list) {
1091                 switch(sdata->vif.type) {
1092                 case NL80211_IFTYPE_STATION:
1093                         ieee80211_sta_restart(sdata);
1094                         break;
1095                 case NL80211_IFTYPE_ADHOC:
1096                         ieee80211_ibss_restart(sdata);
1097                         break;
1098                 case NL80211_IFTYPE_MESH_POINT:
1099                         ieee80211_mesh_restart(sdata);
1100                         break;
1101                 default:
1102                         break;
1103                 }
1104         }
1105
1106         add_timer(&local->sta_cleanup);
1107
1108         spin_lock_irqsave(&local->sta_lock, flags);
1109         list_for_each_entry(sta, &local->sta_list, list)
1110                 mesh_plink_restart(sta);
1111         spin_unlock_irqrestore(&local->sta_lock, flags);
1112 #else
1113         WARN_ON(1);
1114 #endif
1115         return 0;
1116 }