SAFE public projects git trees. - safe/jmp/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 #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 (!skb_queue_empty(&local->pending[queue]) &&
 279             local->queue_stop_reasons[queue] ==
 280                                 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
 281                 tasklet_schedule(&local->tx_pending_tasklet);
 282
 283         if (local->queue_stop_reasons[queue] != 0)
 284                 /* someone still has this queue stopped */
 285                 return;
 286
 287         netif_wake_subqueue(local->mdev, queue);
 288 }
 289
 290 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 291                                     enum queue_stop_reason reason)
 292 {
 293         struct ieee80211_local *local = hw_to_local(hw);
 294         unsigned long flags;
 295
 296         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 297         __ieee80211_wake_queue(hw, queue, reason);
 298         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 299 }
 300
 301 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 302 {
 303         ieee80211_wake_queue_by_reason(hw, queue,
 304                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 305 }
 306 EXPORT_SYMBOL(ieee80211_wake_queue);
 307
 308 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 309                                    enum queue_stop_reason reason)
 310 {
 311         struct ieee80211_local *local = hw_to_local(hw);
 312
 313         if (WARN_ON(queue >= hw->queues))
 314                 return;
 315
 316         /*
 317          * Only stop if it was previously running, this is necessary
 318          * for correct pending packets handling because there we may
 319          * start (but not wake) the queue and rely on that.
 320          */
 321         if (!local->queue_stop_reasons[queue])
 322                 netif_stop_subqueue(local->mdev, queue);
 323
 324         __set_bit(reason, &local->queue_stop_reasons[queue]);
 325 }
 326
 327 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 328                                     enum queue_stop_reason reason)
 329 {
 330         struct ieee80211_local *local = hw_to_local(hw);
 331         unsigned long flags;
 332
 333         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 334         __ieee80211_stop_queue(hw, queue, reason);
 335         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 336 }
 337
 338 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 339 {
 340         ieee80211_stop_queue_by_reason(hw, queue,
 341                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 342 }
 343 EXPORT_SYMBOL(ieee80211_stop_queue);
 344
 345 void ieee80211_add_pending_skb(struct ieee80211_local *local,
 346                                struct sk_buff *skb)
 347 {
 348         struct ieee80211_hw *hw = &local->hw;
 349         unsigned long flags;
 350         int queue = skb_get_queue_mapping(skb);
 351
 352         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 353         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 354         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_PENDING);
 355         skb_queue_tail(&local->pending[queue], skb);
 356         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 357         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 358 }
 359
 360 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
 361                                struct sk_buff_head *skbs)
 362 {
 363         struct ieee80211_hw *hw = &local->hw;
 364         struct sk_buff *skb;
 365         unsigned long flags;
 366         int queue, ret = 0, i;
 367
 368         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 369         for (i = 0; i < hw->queues; i++)
 370                 __ieee80211_stop_queue(hw, i,
 371                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 372
 373         while ((skb = skb_dequeue(skbs))) {
 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                 if (ret)
 381                         __ieee80211_stop_queue(hw, i,
 382                                 IEEE80211_QUEUE_STOP_REASON_PENDING);
 383                 __ieee80211_wake_queue(hw, i,
 384                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 385         }
 386         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 387
 388         return ret;
 389 }
 390
 391 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 392                                     enum queue_stop_reason reason)
 393 {
 394         struct ieee80211_local *local = hw_to_local(hw);
 395         unsigned long flags;
 396         int i;
 397
 398         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 399
 400         for (i = 0; i < hw->queues; i++)
 401                 __ieee80211_stop_queue(hw, i, reason);
 402
 403         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 404 }
 405
 406 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 407 {
 408         ieee80211_stop_queues_by_reason(hw,
 409                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 410 }
 411 EXPORT_SYMBOL(ieee80211_stop_queues);
 412
 413 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 414 {
 415         struct ieee80211_local *local = hw_to_local(hw);
 416
 417         if (WARN_ON(queue >= hw->queues))
 418                 return true;
 419
 420         return __netif_subqueue_stopped(local->mdev, queue);
 421 }
 422 EXPORT_SYMBOL(ieee80211_queue_stopped);
 423
 424 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 425                                      enum queue_stop_reason reason)
 426 {
 427         struct ieee80211_local *local = hw_to_local(hw);
 428         unsigned long flags;
 429         int i;
 430
 431         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 432
 433         for (i = 0; i < hw->queues; i++)
 434                 __ieee80211_wake_queue(hw, i, reason);
 435
 436         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 437 }
 438
 439 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 440 {
 441         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 442 }
 443 EXPORT_SYMBOL(ieee80211_wake_queues);
 444
 445 void ieee80211_iterate_active_interfaces(
 446         struct ieee80211_hw *hw,
 447         void (*iterator)(void *data, u8 *mac,
 448                          struct ieee80211_vif *vif),
 449         void *data)
 450 {
 451         struct ieee80211_local *local = hw_to_local(hw);
 452         struct ieee80211_sub_if_data *sdata;
 453
 454         mutex_lock(&local->iflist_mtx);
 455
 456         list_for_each_entry(sdata, &local->interfaces, list) {
 457                 switch (sdata->vif.type) {
 458                 case __NL80211_IFTYPE_AFTER_LAST:
 459                 case NL80211_IFTYPE_UNSPECIFIED:
 460                 case NL80211_IFTYPE_MONITOR:
 461                 case NL80211_IFTYPE_AP_VLAN:
 462                         continue;
 463                 case NL80211_IFTYPE_AP:
 464                 case NL80211_IFTYPE_STATION:
 465                 case NL80211_IFTYPE_ADHOC:
 466                 case NL80211_IFTYPE_WDS:
 467                 case NL80211_IFTYPE_MESH_POINT:
 468                         break;
 469                 }
 470                 if (netif_running(sdata->dev))
 471                         iterator(data, sdata->dev->dev_addr,
 472                                  &sdata->vif);
 473         }
 474
 475         mutex_unlock(&local->iflist_mtx);
 476 }
 477 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 478
 479 void ieee80211_iterate_active_interfaces_atomic(
 480         struct ieee80211_hw *hw,
 481         void (*iterator)(void *data, u8 *mac,
 482                          struct ieee80211_vif *vif),
 483         void *data)
 484 {
 485         struct ieee80211_local *local = hw_to_local(hw);
 486         struct ieee80211_sub_if_data *sdata;
 487
 488         rcu_read_lock();
 489
 490         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 491                 switch (sdata->vif.type) {
 492                 case __NL80211_IFTYPE_AFTER_LAST:
 493                 case NL80211_IFTYPE_UNSPECIFIED:
 494                 case NL80211_IFTYPE_MONITOR:
 495                 case NL80211_IFTYPE_AP_VLAN:
 496                         continue;
 497                 case NL80211_IFTYPE_AP:
 498                 case NL80211_IFTYPE_STATION:
 499                 case NL80211_IFTYPE_ADHOC:
 500                 case NL80211_IFTYPE_WDS:
 501                 case NL80211_IFTYPE_MESH_POINT:
 502                         break;
 503                 }
 504                 if (netif_running(sdata->dev))
 505                         iterator(data, sdata->dev->dev_addr,
 506                                  &sdata->vif);
 507         }
 508
 509         rcu_read_unlock();
 510 }
 511 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 512
 513 void ieee802_11_parse_elems(u8 *start, size_t len,
 514                             struct ieee802_11_elems *elems)
 515 {
 516         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 517 }
 518
 519 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 520                                struct ieee802_11_elems *elems,
 521                                u64 filter, u32 crc)
 522 {
 523         size_t left = len;
 524         u8 *pos = start;
 525         bool calc_crc = filter != 0;
 526
 527         memset(elems, 0, sizeof(*elems));
 528         elems->ie_start = start;
 529         elems->total_len = len;
 530
 531         while (left >= 2) {
 532                 u8 id, elen;
 533
 534                 id = *pos++;
 535                 elen = *pos++;
 536                 left -= 2;
 537
 538                 if (elen > left)
 539                         break;
 540
 541                 if (calc_crc && id < 64 && (filter & BIT(id)))
 542                         crc = crc32_be(crc, pos - 2, elen + 2);
 543
 544                 switch (id) {
 545                 case WLAN_EID_SSID:
 546                         elems->ssid = pos;
 547                         elems->ssid_len = elen;
 548                         break;
 549                 case WLAN_EID_SUPP_RATES:
 550                         elems->supp_rates = pos;
 551                         elems->supp_rates_len = elen;
 552                         break;
 553                 case WLAN_EID_FH_PARAMS:
 554                         elems->fh_params = pos;
 555                         elems->fh_params_len = elen;
 556                         break;
 557                 case WLAN_EID_DS_PARAMS:
 558                         elems->ds_params = pos;
 559                         elems->ds_params_len = elen;
 560                         break;
 561                 case WLAN_EID_CF_PARAMS:
 562                         elems->cf_params = pos;
 563                         elems->cf_params_len = elen;
 564                         break;
 565                 case WLAN_EID_TIM:
 566                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 567                                 elems->tim = (void *)pos;
 568                                 elems->tim_len = elen;
 569                         }
 570                         break;
 571                 case WLAN_EID_IBSS_PARAMS:
 572                         elems->ibss_params = pos;
 573                         elems->ibss_params_len = elen;
 574                         break;
 575                 case WLAN_EID_CHALLENGE:
 576                         elems->challenge = pos;
 577                         elems->challenge_len = elen;
 578                         break;
 579                 case WLAN_EID_VENDOR_SPECIFIC:
 580                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 581                             pos[2] == 0xf2) {
 582                                 /* Microsoft OUI (00:50:F2) */
 583
 584                                 if (calc_crc)
 585                                         crc = crc32_be(crc, pos - 2, elen + 2);
 586
 587                                 if (pos[3] == 1) {
 588                                         /* OUI Type 1 - WPA IE */
 589                                         elems->wpa = pos;
 590                                         elems->wpa_len = elen;
 591                                 } else if (elen >= 5 && pos[3] == 2) {
 592                                         /* OUI Type 2 - WMM IE */
 593                                         if (pos[4] == 0) {
 594                                                 elems->wmm_info = pos;
 595                                                 elems->wmm_info_len = elen;
 596                                         } else if (pos[4] == 1) {
 597                                                 elems->wmm_param = pos;
 598                                                 elems->wmm_param_len = elen;
 599                                         }
 600                                 }
 601                         }
 602                         break;
 603                 case WLAN_EID_RSN:
 604                         elems->rsn = pos;
 605                         elems->rsn_len = elen;
 606                         break;
 607                 case WLAN_EID_ERP_INFO:
 608                         elems->erp_info = pos;
 609                         elems->erp_info_len = elen;
 610                         break;
 611                 case WLAN_EID_EXT_SUPP_RATES:
 612                         elems->ext_supp_rates = pos;
 613                         elems->ext_supp_rates_len = elen;
 614                         break;
 615                 case WLAN_EID_HT_CAPABILITY:
 616                         if (elen >= sizeof(struct ieee80211_ht_cap))
 617                                 elems->ht_cap_elem = (void *)pos;
 618                         break;
 619                 case WLAN_EID_HT_INFORMATION:
 620                         if (elen >= sizeof(struct ieee80211_ht_info))
 621                                 elems->ht_info_elem = (void *)pos;
 622                         break;
 623                 case WLAN_EID_MESH_ID:
 624                         elems->mesh_id = pos;
 625                         elems->mesh_id_len = elen;
 626                         break;
 627                 case WLAN_EID_MESH_CONFIG:
 628                         elems->mesh_config = pos;
 629                         elems->mesh_config_len = elen;
 630                         break;
 631                 case WLAN_EID_PEER_LINK:
 632                         elems->peer_link = pos;
 633                         elems->peer_link_len = elen;
 634                         break;
 635                 case WLAN_EID_PREQ:
 636                         elems->preq = pos;
 637                         elems->preq_len = elen;
 638                         break;
 639                 case WLAN_EID_PREP:
 640                         elems->prep = pos;
 641                         elems->prep_len = elen;
 642                         break;
 643                 case WLAN_EID_PERR:
 644                         elems->perr = pos;
 645                         elems->perr_len = elen;
 646                         break;
 647                 case WLAN_EID_CHANNEL_SWITCH:
 648                         elems->ch_switch_elem = pos;
 649                         elems->ch_switch_elem_len = elen;
 650                         break;
 651                 case WLAN_EID_QUIET:
 652                         if (!elems->quiet_elem) {
 653                                 elems->quiet_elem = pos;
 654                                 elems->quiet_elem_len = elen;
 655                         }
 656                         elems->num_of_quiet_elem++;
 657                         break;
 658                 case WLAN_EID_COUNTRY:
 659                         elems->country_elem = pos;
 660                         elems->country_elem_len = elen;
 661                         break;
 662                 case WLAN_EID_PWR_CONSTRAINT:
 663                         elems->pwr_constr_elem = pos;
 664                         elems->pwr_constr_elem_len = elen;
 665                         break;
 666                 case WLAN_EID_TIMEOUT_INTERVAL:
 667                         elems->timeout_int = pos;
 668                         elems->timeout_int_len = elen;
 669                         break;
 670                 default:
 671                         break;
 672                 }
 673
 674                 left -= elen;
 675                 pos += elen;
 676         }
 677
 678         return crc;
 679 }
 680
 681 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 682 {
 683         struct ieee80211_local *local = sdata->local;
 684         struct ieee80211_tx_queue_params qparam;
 685         int queue;
 686         bool use_11b;
 687         int aCWmin, aCWmax;
 688
 689         if (!local->ops->conf_tx)
 690                 return;
 691
 692         memset(&qparam, 0, sizeof(qparam));
 693
 694         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 695                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 696
 697         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 698                 /* Set defaults according to 802.11-2007 Table 7-37 */
 699                 aCWmax = 1023;
 700                 if (use_11b)
 701                         aCWmin = 31;
 702                 else
 703                         aCWmin = 15;
 704
 705                 switch (queue) {
 706                 case 3: /* AC_BK */
 707                         qparam.cw_max = aCWmax;
 708                         qparam.cw_min = aCWmin;
 709                         qparam.txop = 0;
 710                         qparam.aifs = 7;
 711                         break;
 712                 default: /* never happens but let's not leave undefined */
 713                 case 2: /* AC_BE */
 714                         qparam.cw_max = aCWmax;
 715                         qparam.cw_min = aCWmin;
 716                         qparam.txop = 0;
 717                         qparam.aifs = 3;
 718                         break;
 719                 case 1: /* AC_VI */
 720                         qparam.cw_max = aCWmin;
 721                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
 722                         if (use_11b)
 723                                 qparam.txop = 6016/32;
 724                         else
 725                                 qparam.txop = 3008/32;
 726                         qparam.aifs = 2;
 727                         break;
 728                 case 0: /* AC_VO */
 729                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
 730                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
 731                         if (use_11b)
 732                                 qparam.txop = 3264/32;
 733                         else
 734                                 qparam.txop = 1504/32;
 735                         qparam.aifs = 2;
 736                         break;
 737                 }
 738
 739                 drv_conf_tx(local, queue, &qparam);
 740         }
 741 }
 742
 743 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 744                                   const size_t supp_rates_len,
 745                                   const u8 *supp_rates)
 746 {
 747         struct ieee80211_local *local = sdata->local;
 748         int i, have_higher_than_11mbit = 0;
 749
 750         /* cf. IEEE 802.11 9.2.12 */
 751         for (i = 0; i < supp_rates_len; i++)
 752                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 753                         have_higher_than_11mbit = 1;
 754
 755         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 756             have_higher_than_11mbit)
 757                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 758         else
 759                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 760
 761         ieee80211_set_wmm_default(sdata);
 762 }
 763
 764 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 765                       int encrypt)
 766 {
 767         skb->dev = sdata->local->mdev;
 768         skb_set_mac_header(skb, 0);
 769         skb_set_network_header(skb, 0);
 770         skb_set_transport_header(skb, 0);
 771
 772         skb->iif = sdata->dev->ifindex;
 773         skb->do_not_encrypt = !encrypt;
 774
 775         dev_queue_xmit(skb);
 776 }
 777
 778 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 779                               enum ieee80211_band band)
 780 {
 781         struct ieee80211_supported_band *sband;
 782         struct ieee80211_rate *bitrates;
 783         u32 mandatory_rates;
 784         enum ieee80211_rate_flags mandatory_flag;
 785         int i;
 786
 787         sband = local->hw.wiphy->bands[band];
 788         if (!sband) {
 789                 WARN_ON(1);
 790                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 791         }
 792
 793         if (band == IEEE80211_BAND_2GHZ)
 794                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 795         else
 796                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 797
 798         bitrates = sband->bitrates;
 799         mandatory_rates = 0;
 800         for (i = 0; i < sband->n_bitrates; i++)
 801                 if (bitrates[i].flags & mandatory_flag)
 802                         mandatory_rates |= BIT(i);
 803         return mandatory_rates;
 804 }
 805
 806 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 807                          u16 transaction, u16 auth_alg,
 808                          u8 *extra, size_t extra_len, const u8 *bssid,
 809                          const u8 *key, u8 key_len, u8 key_idx)
 810 {
 811         struct ieee80211_local *local = sdata->local;
 812         struct sk_buff *skb;
 813         struct ieee80211_mgmt *mgmt;
 814         int err;
 815
 816         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 817                             sizeof(*mgmt) + 6 + extra_len);
 818         if (!skb) {
 819                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 820                        "frame\n", sdata->dev->name);
 821                 return;
 822         }
 823         skb_reserve(skb, local->hw.extra_tx_headroom);
 824
 825         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 826         memset(mgmt, 0, 24 + 6);
 827         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 828                                           IEEE80211_STYPE_AUTH);
 829         memcpy(mgmt->da, bssid, ETH_ALEN);
 830         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 831         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 832         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 833         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 834         mgmt->u.auth.status_code = cpu_to_le16(0);
 835         if (extra)
 836                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 837
 838         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 839                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 840                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 841                 WARN_ON(err);
 842         }
 843
 844         ieee80211_tx_skb(sdata, skb, 0);
 845 }
 846
 847 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 848                              const u8 *ie, size_t ie_len)
 849 {
 850         struct ieee80211_supported_band *sband;
 851         u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
 852         int i;
 853
 854         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 855
 856         pos = buffer;
 857
 858         *pos++ = WLAN_EID_SUPP_RATES;
 859         supp_rates_len = pos;
 860         *pos++ = 0;
 861
 862         for (i = 0; i < sband->n_bitrates; i++) {
 863                 struct ieee80211_rate *rate = &sband->bitrates[i];
 864
 865                 if (esupp_rates_len) {
 866                         *esupp_rates_len += 1;
 867                 } else if (*supp_rates_len == 8) {
 868                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
 869                         esupp_rates_len = pos;
 870                         *pos++ = 1;
 871                 } else
 872                         *supp_rates_len += 1;
 873
 874                 *pos++ = rate->bitrate / 5;
 875         }
 876
 877         if (sband->ht_cap.ht_supported) {
 878                 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
 879
 880                 *pos++ = WLAN_EID_HT_CAPABILITY;
 881                 *pos++ = sizeof(struct ieee80211_ht_cap);
 882                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 883                 memcpy(pos, &tmp, sizeof(u16));
 884                 pos += sizeof(u16);
 885                 /* TODO: needs a define here for << 2 */
 886                 *pos++ = sband->ht_cap.ampdu_factor |
 887                          (sband->ht_cap.ampdu_density << 2);
 888                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 889                 pos += sizeof(sband->ht_cap.mcs);
 890                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 891         }
 892
 893         /*
 894          * If adding more here, adjust code in main.c
 895          * that calculates local->scan_ies_len.
 896          */
 897
 898         if (ie) {
 899                 memcpy(pos, ie, ie_len);
 900                 pos += ie_len;
 901         }
 902
 903         return pos - buffer;
 904 }
 905
 906 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 907                               const u8 *ssid, size_t ssid_len,
 908                               const u8 *ie, size_t ie_len)
 909 {
 910         struct ieee80211_local *local = sdata->local;
 911         struct sk_buff *skb;
 912         struct ieee80211_mgmt *mgmt;
 913         u8 *pos;
 914
 915         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 916                             ie_len);
 917         if (!skb) {
 918                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 919                        "request\n", sdata->dev->name);
 920                 return;
 921         }
 922         skb_reserve(skb, local->hw.extra_tx_headroom);
 923
 924         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 925         memset(mgmt, 0, 24);
 926         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 927                                           IEEE80211_STYPE_PROBE_REQ);
 928         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 929         if (dst) {
 930                 memcpy(mgmt->da, dst, ETH_ALEN);
 931                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 932         } else {
 933                 memset(mgmt->da, 0xff, ETH_ALEN);
 934                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 935         }
 936         pos = skb_put(skb, 2 + ssid_len);
 937         *pos++ = WLAN_EID_SSID;
 938         *pos++ = ssid_len;
 939         memcpy(pos, ssid, ssid_len);
 940         pos += ssid_len;
 941
 942         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
 943
 944         ieee80211_tx_skb(sdata, skb, 0);
 945 }
 946
 947 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 948                             struct ieee802_11_elems *elems,
 949                             enum ieee80211_band band)
 950 {
 951         struct ieee80211_supported_band *sband;
 952         struct ieee80211_rate *bitrates;
 953         size_t num_rates;
 954         u32 supp_rates;
 955         int i, j;
 956         sband = local->hw.wiphy->bands[band];
 957
 958         if (!sband) {
 959                 WARN_ON(1);
 960                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 961         }
 962
 963         bitrates = sband->bitrates;
 964         num_rates = sband->n_bitrates;
 965         supp_rates = 0;
 966         for (i = 0; i < elems->supp_rates_len +
 967                      elems->ext_supp_rates_len; i++) {
 968                 u8 rate = 0;
 969                 int own_rate;
 970                 if (i < elems->supp_rates_len)
 971                         rate = elems->supp_rates[i];
 972                 else if (elems->ext_supp_rates)
 973                         rate = elems->ext_supp_rates
 974                                 [i - elems->supp_rates_len];
 975                 own_rate = 5 * (rate & 0x7f);
 976                 for (j = 0; j < num_rates; j++)
 977                         if (bitrates[j].bitrate == own_rate)
 978                                 supp_rates |= BIT(j);
 979         }
 980         return supp_rates;
 981 }
 982
 983 int ieee80211_reconfig(struct ieee80211_local *local)
 984 {
 985         struct ieee80211_hw *hw = &local->hw;
 986         struct ieee80211_sub_if_data *sdata;
 987         struct ieee80211_if_init_conf conf;
 988         struct sta_info *sta;
 989         unsigned long flags;
 990         int res;
 991         bool from_suspend = local->suspended;
 992
 993         /*
 994          * We're going to start the hardware, at that point
 995          * we are no longer suspended and can RX frames.
 996          */
 997         local->suspended = false;
 998
 999         /* restart hardware */
1000         if (local->open_count) {
1001                 res = drv_start(local);
1002
1003                 ieee80211_led_radio(local, true);
1004         }
1005
1006         /* add interfaces */
1007         list_for_each_entry(sdata, &local->interfaces, list) {
1008                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1009                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1010                     netif_running(sdata->dev)) {
1011                         conf.vif = &sdata->vif;
1012                         conf.type = sdata->vif.type;
1013                         conf.mac_addr = sdata->dev->dev_addr;
1014                         res = drv_add_interface(local, &conf);
1015                 }
1016         }
1017
1018         /* add STAs back */
1019         if (local->ops->sta_notify) {
1020                 spin_lock_irqsave(&local->sta_lock, flags);
1021                 list_for_each_entry(sta, &local->sta_list, list) {
1022                         sdata = sta->sdata;
1023                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1024                                 sdata = container_of(sdata->bss,
1025                                              struct ieee80211_sub_if_data,
1026                                              u.ap);
1027
1028                         drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1029                                        &sta->sta);
1030                 }
1031                 spin_unlock_irqrestore(&local->sta_lock, flags);
1032         }
1033
1034         /* Clear Suspend state so that ADDBA requests can be processed */
1035
1036         rcu_read_lock();
1037
1038         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1039                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1040                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1041                 }
1042         }
1043
1044         rcu_read_unlock();
1045
1046         /* setup RTS threshold */
1047         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1048
1049         /* reconfigure hardware */
1050         ieee80211_hw_config(local, ~0);
1051
1052         netif_addr_lock_bh(local->mdev);
1053         ieee80211_configure_filter(local);
1054         netif_addr_unlock_bh(local->mdev);
1055
1056         /* Finally also reconfigure all the BSS information */
1057         list_for_each_entry(sdata, &local->interfaces, list) {
1058                 u32 changed = ~0;
1059                 if (!netif_running(sdata->dev))
1060                         continue;
1061                 switch (sdata->vif.type) {
1062                 case NL80211_IFTYPE_STATION:
1063                         /* disable beacon change bits */
1064                         changed &= ~(BSS_CHANGED_BEACON |
1065                                      BSS_CHANGED_BEACON_ENABLED);
1066                         /* fall through */
1067                 case NL80211_IFTYPE_ADHOC:
1068                 case NL80211_IFTYPE_AP:
1069                 case NL80211_IFTYPE_MESH_POINT:
1070                         ieee80211_bss_info_change_notify(sdata, changed);
1071                         break;
1072                 case NL80211_IFTYPE_WDS:
1073                         break;
1074                 case NL80211_IFTYPE_AP_VLAN:
1075                 case NL80211_IFTYPE_MONITOR:
1076                         /* ignore virtual */
1077                         break;
1078                 case NL80211_IFTYPE_UNSPECIFIED:
1079                 case __NL80211_IFTYPE_AFTER_LAST:
1080                         WARN_ON(1);
1081                         break;
1082                 }
1083         }
1084
1085         /* add back keys */
1086         list_for_each_entry(sdata, &local->interfaces, list)
1087                 if (netif_running(sdata->dev))
1088                         ieee80211_enable_keys(sdata);
1089
1090         ieee80211_wake_queues_by_reason(hw,
1091                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1092
1093         /*
1094          * If this is for hw restart things are still running.
1095          * We may want to change that later, however.
1096          */
1097         if (!from_suspend)
1098                 return 0;
1099
1100 #ifdef CONFIG_PM
1101         local->suspended = false;
1102
1103         list_for_each_entry(sdata, &local->interfaces, list) {
1104                 switch(sdata->vif.type) {
1105                 case NL80211_IFTYPE_STATION:
1106                         ieee80211_sta_restart(sdata);
1107                         break;
1108                 case NL80211_IFTYPE_ADHOC:
1109                         ieee80211_ibss_restart(sdata);
1110                         break;
1111                 case NL80211_IFTYPE_MESH_POINT:
1112                         ieee80211_mesh_restart(sdata);
1113                         break;
1114                 default:
1115                         break;
1116                 }
1117         }
1118
1119         add_timer(&local->sta_cleanup);
1120
1121         spin_lock_irqsave(&local->sta_lock, flags);
1122         list_for_each_entry(sta, &local->sta_list, list)
1123                 mesh_plink_restart(sta);
1124         spin_unlock_irqrestore(&local->sta_lock, flags);
1125 #else
1126         WARN_ON(1);
1127 #endif
1128         return 0;
1129 }