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 <net/net_namespace.h>
  24 #include <net/cfg80211.h>
  25 #include <net/rtnetlink.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "mesh.h"
  30 #include "wme.h"
  31
  32 /* privid for wiphys to determine whether they belong to us or not */
  33 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  34
  35 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
  36 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  37 const unsigned char rfc1042_header[] __aligned(2) =
  38         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  39
  40 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  41 const unsigned char bridge_tunnel_header[] __aligned(2) =
  42         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  43
  44 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  45 {
  46         struct ieee80211_local *local;
  47         BUG_ON(!wiphy);
  48
  49         local = wiphy_priv(wiphy);
  50         return &local->hw;
  51 }
  52 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  53
  54 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  55                         enum nl80211_iftype type)
  56 {
  57         __le16 fc = hdr->frame_control;
  58
  59          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  60         if (len < 16)
  61                 return NULL;
  62
  63         if (ieee80211_is_data(fc)) {
  64                 if (len < 24) /* drop incorrect hdr len (data) */
  65                         return NULL;
  66
  67                 if (ieee80211_has_a4(fc))
  68                         return NULL;
  69                 if (ieee80211_has_tods(fc))
  70                         return hdr->addr1;
  71                 if (ieee80211_has_fromds(fc))
  72                         return hdr->addr2;
  73
  74                 return hdr->addr3;
  75         }
  76
  77         if (ieee80211_is_mgmt(fc)) {
  78                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  79                         return NULL;
  80                 return hdr->addr3;
  81         }
  82
  83         if (ieee80211_is_ctl(fc)) {
  84                 if(ieee80211_is_pspoll(fc))
  85                         return hdr->addr1;
  86
  87                 if (ieee80211_is_back_req(fc)) {
  88                         switch (type) {
  89                         case NL80211_IFTYPE_STATION:
  90                                 return hdr->addr2;
  91                         case NL80211_IFTYPE_AP:
  92                         case NL80211_IFTYPE_AP_VLAN:
  93                                 return hdr->addr1;
  94                         default:
  95                                 break; /* fall through to the return */
  96                         }
  97                 }
  98         }
  99
 100         return NULL;
 101 }
 102
 103 unsigned int ieee80211_hdrlen(__le16 fc)
 104 {
 105         unsigned int hdrlen = 24;
 106
 107         if (ieee80211_is_data(fc)) {
 108                 if (ieee80211_has_a4(fc))
 109                         hdrlen = 30;
 110                 if (ieee80211_is_data_qos(fc))
 111                         hdrlen += IEEE80211_QOS_CTL_LEN;
 112                 goto out;
 113         }
 114
 115         if (ieee80211_is_ctl(fc)) {
 116                 /*
 117                  * ACK and CTS are 10 bytes, all others 16. To see how
 118                  * to get this condition consider
 119                  *   subtype mask:   0b0000000011110000 (0x00F0)
 120                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 121                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 122                  *   bits that matter:         ^^^      (0x00E0)
 123                  *   value of those: 0b0000000011000000 (0x00C0)
 124                  */
 125                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 126                         hdrlen = 10;
 127                 else
 128                         hdrlen = 16;
 129         }
 130 out:
 131         return hdrlen;
 132 }
 133 EXPORT_SYMBOL(ieee80211_hdrlen);
 134
 135 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 136 {
 137         const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
 138         unsigned int hdrlen;
 139
 140         if (unlikely(skb->len < 10))
 141                 return 0;
 142         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 143         if (unlikely(hdrlen > skb->len))
 144                 return 0;
 145         return hdrlen;
 146 }
 147 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 148
 149 int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 150 {
 151         int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
 152         /* 7.1.3.5a.2 */
 153         switch (ae) {
 154         case 0:
 155                 return 6;
 156         case 1:
 157                 return 12;
 158         case 2:
 159                 return 18;
 160         case 3:
 161                 return 24;
 162         default:
 163                 return 6;
 164         }
 165 }
 166
 167 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
 168 {
 169         struct sk_buff *skb = tx->skb;
 170         struct ieee80211_hdr *hdr;
 171
 172         do {
 173                 hdr = (struct ieee80211_hdr *) skb->data;
 174                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 175         } while ((skb = skb->next));
 176 }
 177
 178 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 179                              int rate, int erp, int short_preamble)
 180 {
 181         int dur;
 182
 183         /* calculate duration (in microseconds, rounded up to next higher
 184          * integer if it includes a fractional microsecond) to send frame of
 185          * len bytes (does not include FCS) at the given rate. Duration will
 186          * also include SIFS.
 187          *
 188          * rate is in 100 kbps, so divident is multiplied by 10 in the
 189          * DIV_ROUND_UP() operations.
 190          */
 191
 192         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 193                 /*
 194                  * OFDM:
 195                  *
 196                  * N_DBPS = DATARATE x 4
 197                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 198                  *      (16 = SIGNAL time, 6 = tail bits)
 199                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 200                  *
 201                  * T_SYM = 4 usec
 202                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 203                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 204                  *      signal ext = 6 usec
 205                  */
 206                 dur = 16; /* SIFS + signal ext */
 207                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 208                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 209                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 210                                         4 * rate); /* T_SYM x N_SYM */
 211         } else {
 212                 /*
 213                  * 802.11b or 802.11g with 802.11b compatibility:
 214                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 215                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 216                  *
 217                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 218                  * aSIFSTime = 10 usec
 219                  * aPreambleLength = 144 usec or 72 usec with short preamble
 220                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 221                  */
 222                 dur = 10; /* aSIFSTime = 10 usec */
 223                 dur += short_preamble ? (72 + 24) : (144 + 48);
 224
 225                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 226         }
 227
 228         return dur;
 229 }
 230
 231 /* Exported duration function for driver use */
 232 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 233                                         struct ieee80211_vif *vif,
 234                                         size_t frame_len,
 235                                         struct ieee80211_rate *rate)
 236 {
 237         struct ieee80211_local *local = hw_to_local(hw);
 238         struct ieee80211_sub_if_data *sdata;
 239         u16 dur;
 240         int erp;
 241         bool short_preamble = false;
 242
 243         erp = 0;
 244         if (vif) {
 245                 sdata = vif_to_sdata(vif);
 246                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 247                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 248                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 249         }
 250
 251         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 252                                        short_preamble);
 253
 254         return cpu_to_le16(dur);
 255 }
 256 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 257
 258 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 259                               struct ieee80211_vif *vif, size_t frame_len,
 260                               const struct ieee80211_tx_info *frame_txctl)
 261 {
 262         struct ieee80211_local *local = hw_to_local(hw);
 263         struct ieee80211_rate *rate;
 264         struct ieee80211_sub_if_data *sdata;
 265         bool short_preamble;
 266         int erp;
 267         u16 dur;
 268         struct ieee80211_supported_band *sband;
 269
 270         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 271
 272         short_preamble = false;
 273
 274         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 275
 276         erp = 0;
 277         if (vif) {
 278                 sdata = vif_to_sdata(vif);
 279                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 280                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 281                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 282         }
 283
 284         /* CTS duration */
 285         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 286                                        erp, short_preamble);
 287         /* Data frame duration */
 288         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 289                                         erp, short_preamble);
 290         /* ACK duration */
 291         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 292                                         erp, short_preamble);
 293
 294         return cpu_to_le16(dur);
 295 }
 296 EXPORT_SYMBOL(ieee80211_rts_duration);
 297
 298 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 299                                     struct ieee80211_vif *vif,
 300                                     size_t frame_len,
 301                                     const struct ieee80211_tx_info *frame_txctl)
 302 {
 303         struct ieee80211_local *local = hw_to_local(hw);
 304         struct ieee80211_rate *rate;
 305         struct ieee80211_sub_if_data *sdata;
 306         bool short_preamble;
 307         int erp;
 308         u16 dur;
 309         struct ieee80211_supported_band *sband;
 310
 311         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 312
 313         short_preamble = false;
 314
 315         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 316         erp = 0;
 317         if (vif) {
 318                 sdata = vif_to_sdata(vif);
 319                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 320                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 321                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 322         }
 323
 324         /* Data frame duration */
 325         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 326                                        erp, short_preamble);
 327         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 328                 /* ACK duration */
 329                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 330                                                 erp, short_preamble);
 331         }
 332
 333         return cpu_to_le16(dur);
 334 }
 335 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 336
 337 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 338                                    enum queue_stop_reason reason)
 339 {
 340         struct ieee80211_local *local = hw_to_local(hw);
 341
 342         if (WARN_ON(queue >= hw->queues))
 343                 return;
 344
 345         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 346
 347         if (!skb_queue_empty(&local->pending[queue]) &&
 348             local->queue_stop_reasons[queue] ==
 349                                 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
 350                 tasklet_schedule(&local->tx_pending_tasklet);
 351
 352         if (local->queue_stop_reasons[queue] != 0)
 353                 /* someone still has this queue stopped */
 354                 return;
 355
 356         netif_wake_subqueue(local->mdev, queue);
 357 }
 358
 359 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 360                                     enum queue_stop_reason reason)
 361 {
 362         struct ieee80211_local *local = hw_to_local(hw);
 363         unsigned long flags;
 364
 365         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 366         __ieee80211_wake_queue(hw, queue, reason);
 367         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 368 }
 369
 370 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 371 {
 372         ieee80211_wake_queue_by_reason(hw, queue,
 373                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 374 }
 375 EXPORT_SYMBOL(ieee80211_wake_queue);
 376
 377 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 378                                    enum queue_stop_reason reason)
 379 {
 380         struct ieee80211_local *local = hw_to_local(hw);
 381
 382         if (WARN_ON(queue >= hw->queues))
 383                 return;
 384
 385         /*
 386          * Only stop if it was previously running, this is necessary
 387          * for correct pending packets handling because there we may
 388          * start (but not wake) the queue and rely on that.
 389          */
 390         if (!local->queue_stop_reasons[queue])
 391                 netif_stop_subqueue(local->mdev, queue);
 392
 393         __set_bit(reason, &local->queue_stop_reasons[queue]);
 394 }
 395
 396 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 397                                     enum queue_stop_reason reason)
 398 {
 399         struct ieee80211_local *local = hw_to_local(hw);
 400         unsigned long flags;
 401
 402         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 403         __ieee80211_stop_queue(hw, queue, reason);
 404         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 405 }
 406
 407 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 408 {
 409         ieee80211_stop_queue_by_reason(hw, queue,
 410                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 411 }
 412 EXPORT_SYMBOL(ieee80211_stop_queue);
 413
 414 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 415                                     enum queue_stop_reason reason)
 416 {
 417         struct ieee80211_local *local = hw_to_local(hw);
 418         unsigned long flags;
 419         int i;
 420
 421         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 422
 423         for (i = 0; i < hw->queues; i++)
 424                 __ieee80211_stop_queue(hw, i, reason);
 425
 426         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 427 }
 428
 429 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 430 {
 431         ieee80211_stop_queues_by_reason(hw,
 432                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 433 }
 434 EXPORT_SYMBOL(ieee80211_stop_queues);
 435
 436 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 437 {
 438         struct ieee80211_local *local = hw_to_local(hw);
 439
 440         if (WARN_ON(queue >= hw->queues))
 441                 return true;
 442
 443         return __netif_subqueue_stopped(local->mdev, queue);
 444 }
 445 EXPORT_SYMBOL(ieee80211_queue_stopped);
 446
 447 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 448                                      enum queue_stop_reason reason)
 449 {
 450         struct ieee80211_local *local = hw_to_local(hw);
 451         unsigned long flags;
 452         int i;
 453
 454         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 455
 456         for (i = 0; i < hw->queues; i++)
 457                 __ieee80211_wake_queue(hw, i, reason);
 458
 459         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 460 }
 461
 462 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 463 {
 464         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 465 }
 466 EXPORT_SYMBOL(ieee80211_wake_queues);
 467
 468 void ieee80211_iterate_active_interfaces(
 469         struct ieee80211_hw *hw,
 470         void (*iterator)(void *data, u8 *mac,
 471                          struct ieee80211_vif *vif),
 472         void *data)
 473 {
 474         struct ieee80211_local *local = hw_to_local(hw);
 475         struct ieee80211_sub_if_data *sdata;
 476
 477         mutex_lock(&local->iflist_mtx);
 478
 479         list_for_each_entry(sdata, &local->interfaces, list) {
 480                 switch (sdata->vif.type) {
 481                 case __NL80211_IFTYPE_AFTER_LAST:
 482                 case NL80211_IFTYPE_UNSPECIFIED:
 483                 case NL80211_IFTYPE_MONITOR:
 484                 case NL80211_IFTYPE_AP_VLAN:
 485                         continue;
 486                 case NL80211_IFTYPE_AP:
 487                 case NL80211_IFTYPE_STATION:
 488                 case NL80211_IFTYPE_ADHOC:
 489                 case NL80211_IFTYPE_WDS:
 490                 case NL80211_IFTYPE_MESH_POINT:
 491                         break;
 492                 }
 493                 if (netif_running(sdata->dev))
 494                         iterator(data, sdata->dev->dev_addr,
 495                                  &sdata->vif);
 496         }
 497
 498         mutex_unlock(&local->iflist_mtx);
 499 }
 500 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 501
 502 void ieee80211_iterate_active_interfaces_atomic(
 503         struct ieee80211_hw *hw,
 504         void (*iterator)(void *data, u8 *mac,
 505                          struct ieee80211_vif *vif),
 506         void *data)
 507 {
 508         struct ieee80211_local *local = hw_to_local(hw);
 509         struct ieee80211_sub_if_data *sdata;
 510
 511         rcu_read_lock();
 512
 513         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 514                 switch (sdata->vif.type) {
 515                 case __NL80211_IFTYPE_AFTER_LAST:
 516                 case NL80211_IFTYPE_UNSPECIFIED:
 517                 case NL80211_IFTYPE_MONITOR:
 518                 case NL80211_IFTYPE_AP_VLAN:
 519                         continue;
 520                 case NL80211_IFTYPE_AP:
 521                 case NL80211_IFTYPE_STATION:
 522                 case NL80211_IFTYPE_ADHOC:
 523                 case NL80211_IFTYPE_WDS:
 524                 case NL80211_IFTYPE_MESH_POINT:
 525                         break;
 526                 }
 527                 if (netif_running(sdata->dev))
 528                         iterator(data, sdata->dev->dev_addr,
 529                                  &sdata->vif);
 530         }
 531
 532         rcu_read_unlock();
 533 }
 534 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 535
 536 void ieee802_11_parse_elems(u8 *start, size_t len,
 537                             struct ieee802_11_elems *elems)
 538 {
 539         size_t left = len;
 540         u8 *pos = start;
 541
 542         memset(elems, 0, sizeof(*elems));
 543         elems->ie_start = start;
 544         elems->total_len = len;
 545
 546         while (left >= 2) {
 547                 u8 id, elen;
 548
 549                 id = *pos++;
 550                 elen = *pos++;
 551                 left -= 2;
 552
 553                 if (elen > left)
 554                         return;
 555
 556                 switch (id) {
 557                 case WLAN_EID_SSID:
 558                         elems->ssid = pos;
 559                         elems->ssid_len = elen;
 560                         break;
 561                 case WLAN_EID_SUPP_RATES:
 562                         elems->supp_rates = pos;
 563                         elems->supp_rates_len = elen;
 564                         break;
 565                 case WLAN_EID_FH_PARAMS:
 566                         elems->fh_params = pos;
 567                         elems->fh_params_len = elen;
 568                         break;
 569                 case WLAN_EID_DS_PARAMS:
 570                         elems->ds_params = pos;
 571                         elems->ds_params_len = elen;
 572                         break;
 573                 case WLAN_EID_CF_PARAMS:
 574                         elems->cf_params = pos;
 575                         elems->cf_params_len = elen;
 576                         break;
 577                 case WLAN_EID_TIM:
 578                         elems->tim = pos;
 579                         elems->tim_len = elen;
 580                         break;
 581                 case WLAN_EID_IBSS_PARAMS:
 582                         elems->ibss_params = pos;
 583                         elems->ibss_params_len = elen;
 584                         break;
 585                 case WLAN_EID_CHALLENGE:
 586                         elems->challenge = pos;
 587                         elems->challenge_len = elen;
 588                         break;
 589                 case WLAN_EID_WPA:
 590                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 591                             pos[2] == 0xf2) {
 592                                 /* Microsoft OUI (00:50:F2) */
 593                                 if (pos[3] == 1) {
 594                                         /* OUI Type 1 - WPA IE */
 595                                         elems->wpa = pos;
 596                                         elems->wpa_len = elen;
 597                                 } else if (elen >= 5 && pos[3] == 2) {
 598                                         if (pos[4] == 0) {
 599                                                 elems->wmm_info = pos;
 600                                                 elems->wmm_info_len = elen;
 601                                         } else if (pos[4] == 1) {
 602                                                 elems->wmm_param = pos;
 603                                                 elems->wmm_param_len = elen;
 604                                         }
 605                                 }
 606                         }
 607                         break;
 608                 case WLAN_EID_RSN:
 609                         elems->rsn = pos;
 610                         elems->rsn_len = elen;
 611                         break;
 612                 case WLAN_EID_ERP_INFO:
 613                         elems->erp_info = pos;
 614                         elems->erp_info_len = elen;
 615                         break;
 616                 case WLAN_EID_EXT_SUPP_RATES:
 617                         elems->ext_supp_rates = pos;
 618                         elems->ext_supp_rates_len = elen;
 619                         break;
 620                 case WLAN_EID_HT_CAPABILITY:
 621                         if (elen >= sizeof(struct ieee80211_ht_cap))
 622                                 elems->ht_cap_elem = (void *)pos;
 623                         break;
 624                 case WLAN_EID_HT_INFORMATION:
 625                         if (elen >= sizeof(struct ieee80211_ht_info))
 626                                 elems->ht_info_elem = (void *)pos;
 627                         break;
 628                 case WLAN_EID_MESH_ID:
 629                         elems->mesh_id = pos;
 630                         elems->mesh_id_len = elen;
 631                         break;
 632                 case WLAN_EID_MESH_CONFIG:
 633                         elems->mesh_config = pos;
 634                         elems->mesh_config_len = elen;
 635                         break;
 636                 case WLAN_EID_PEER_LINK:
 637                         elems->peer_link = pos;
 638                         elems->peer_link_len = elen;
 639                         break;
 640                 case WLAN_EID_PREQ:
 641                         elems->preq = pos;
 642                         elems->preq_len = elen;
 643                         break;
 644                 case WLAN_EID_PREP:
 645                         elems->prep = pos;
 646                         elems->prep_len = elen;
 647                         break;
 648                 case WLAN_EID_PERR:
 649                         elems->perr = pos;
 650                         elems->perr_len = elen;
 651                         break;
 652                 case WLAN_EID_CHANNEL_SWITCH:
 653                         elems->ch_switch_elem = pos;
 654                         elems->ch_switch_elem_len = elen;
 655                         break;
 656                 case WLAN_EID_QUIET:
 657                         if (!elems->quiet_elem) {
 658                                 elems->quiet_elem = pos;
 659                                 elems->quiet_elem_len = elen;
 660                         }
 661                         elems->num_of_quiet_elem++;
 662                         break;
 663                 case WLAN_EID_COUNTRY:
 664                         elems->country_elem = pos;
 665                         elems->country_elem_len = elen;
 666                         break;
 667                 case WLAN_EID_PWR_CONSTRAINT:
 668                         elems->pwr_constr_elem = pos;
 669                         elems->pwr_constr_elem_len = elen;
 670                         break;
 671                 case WLAN_EID_TIMEOUT_INTERVAL:
 672                         elems->timeout_int = pos;
 673                         elems->timeout_int_len = elen;
 674                         break;
 675                 default:
 676                         break;
 677                 }
 678
 679                 left -= elen;
 680                 pos += elen;
 681         }
 682 }
 683
 684 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 685 {
 686         struct ieee80211_local *local = sdata->local;
 687         struct ieee80211_tx_queue_params qparam;
 688         int i;
 689
 690         if (!local->ops->conf_tx)
 691                 return;
 692
 693         memset(&qparam, 0, sizeof(qparam));
 694
 695         qparam.aifs = 2;
 696
 697         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 698             !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
 699                 qparam.cw_min = 31;
 700         else
 701                 qparam.cw_min = 15;
 702
 703         qparam.cw_max = 1023;
 704         qparam.txop = 0;
 705
 706         for (i = 0; i < local_to_hw(local)->queues; i++)
 707                 local->ops->conf_tx(local_to_hw(local), i, &qparam);
 708 }
 709
 710 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 711                                   const size_t supp_rates_len,
 712                                   const u8 *supp_rates)
 713 {
 714         struct ieee80211_local *local = sdata->local;
 715         int i, have_higher_than_11mbit = 0;
 716
 717         /* cf. IEEE 802.11 9.2.12 */
 718         for (i = 0; i < supp_rates_len; i++)
 719                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 720                         have_higher_than_11mbit = 1;
 721
 722         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 723             have_higher_than_11mbit)
 724                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 725         else
 726                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 727
 728         ieee80211_set_wmm_default(sdata);
 729 }
 730
 731 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 732                       int encrypt)
 733 {
 734         skb->dev = sdata->local->mdev;
 735         skb_set_mac_header(skb, 0);
 736         skb_set_network_header(skb, 0);
 737         skb_set_transport_header(skb, 0);
 738
 739         skb->iif = sdata->dev->ifindex;
 740         skb->do_not_encrypt = !encrypt;
 741
 742         dev_queue_xmit(skb);
 743 }
 744
 745 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
 746 {
 747         int ret = -EINVAL;
 748         struct ieee80211_channel *chan;
 749         struct ieee80211_local *local = sdata->local;
 750
 751         chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
 752
 753         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
 754                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 755                     chan->flags & IEEE80211_CHAN_NO_IBSS)
 756                         return ret;
 757                 local->oper_channel = chan;
 758                 local->oper_channel_type = NL80211_CHAN_NO_HT;
 759
 760                 if (local->sw_scanning || local->hw_scanning)
 761                         ret = 0;
 762                 else
 763                         ret = ieee80211_hw_config(
 764                                 local, IEEE80211_CONF_CHANGE_CHANNEL);
 765         }
 766
 767         return ret;
 768 }
 769
 770 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 771                               enum ieee80211_band band)
 772 {
 773         struct ieee80211_supported_band *sband;
 774         struct ieee80211_rate *bitrates;
 775         u32 mandatory_rates;
 776         enum ieee80211_rate_flags mandatory_flag;
 777         int i;
 778
 779         sband = local->hw.wiphy->bands[band];
 780         if (!sband) {
 781                 WARN_ON(1);
 782                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 783         }
 784
 785         if (band == IEEE80211_BAND_2GHZ)
 786                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 787         else
 788                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 789
 790         bitrates = sband->bitrates;
 791         mandatory_rates = 0;
 792         for (i = 0; i < sband->n_bitrates; i++)
 793                 if (bitrates[i].flags & mandatory_flag)
 794                         mandatory_rates |= BIT(i);
 795         return mandatory_rates;
 796 }
 797
 798 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 799                          u16 transaction, u16 auth_alg,
 800                          u8 *extra, size_t extra_len,
 801                          const u8 *bssid, int encrypt)
 802 {
 803         struct ieee80211_local *local = sdata->local;
 804         struct sk_buff *skb;
 805         struct ieee80211_mgmt *mgmt;
 806
 807         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 808                             sizeof(*mgmt) + 6 + extra_len);
 809         if (!skb) {
 810                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 811                        "frame\n", sdata->dev->name);
 812                 return;
 813         }
 814         skb_reserve(skb, local->hw.extra_tx_headroom);
 815
 816         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 817         memset(mgmt, 0, 24 + 6);
 818         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 819                                           IEEE80211_STYPE_AUTH);
 820         if (encrypt)
 821                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 822         memcpy(mgmt->da, bssid, ETH_ALEN);
 823         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 824         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 825         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 826         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 827         mgmt->u.auth.status_code = cpu_to_le16(0);
 828         if (extra)
 829                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 830
 831         ieee80211_tx_skb(sdata, skb, encrypt);
 832 }
 833
 834 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 835                               u8 *ssid, size_t ssid_len,
 836                               u8 *ie, size_t ie_len)
 837 {
 838         struct ieee80211_local *local = sdata->local;
 839         struct ieee80211_supported_band *sband;
 840         struct sk_buff *skb;
 841         struct ieee80211_mgmt *mgmt;
 842         u8 *pos, *supp_rates, *esupp_rates = NULL;
 843         int i;
 844
 845         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 846                             ie_len);
 847         if (!skb) {
 848                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 849                        "request\n", sdata->dev->name);
 850                 return;
 851         }
 852         skb_reserve(skb, local->hw.extra_tx_headroom);
 853
 854         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 855         memset(mgmt, 0, 24);
 856         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 857                                           IEEE80211_STYPE_PROBE_REQ);
 858         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 859         if (dst) {
 860                 memcpy(mgmt->da, dst, ETH_ALEN);
 861                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 862         } else {
 863                 memset(mgmt->da, 0xff, ETH_ALEN);
 864                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 865         }
 866         pos = skb_put(skb, 2 + ssid_len);
 867         *pos++ = WLAN_EID_SSID;
 868         *pos++ = ssid_len;
 869         memcpy(pos, ssid, ssid_len);
 870
 871         supp_rates = skb_put(skb, 2);
 872         supp_rates[0] = WLAN_EID_SUPP_RATES;
 873         supp_rates[1] = 0;
 874         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 875
 876         for (i = 0; i < sband->n_bitrates; i++) {
 877                 struct ieee80211_rate *rate = &sband->bitrates[i];
 878                 if (esupp_rates) {
 879                         pos = skb_put(skb, 1);
 880                         esupp_rates[1]++;
 881                 } else if (supp_rates[1] == 8) {
 882                         esupp_rates = skb_put(skb, 3);
 883                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 884                         esupp_rates[1] = 1;
 885                         pos = &esupp_rates[2];
 886                 } else {
 887                         pos = skb_put(skb, 1);
 888                         supp_rates[1]++;
 889                 }
 890                 *pos = rate->bitrate / 5;
 891         }
 892
 893         if (ie)
 894                 memcpy(skb_put(skb, ie_len), ie, ie_len);
 895
 896         ieee80211_tx_skb(sdata, skb, 0);
 897 }
 898
 899 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 900                             struct ieee802_11_elems *elems,
 901                             enum ieee80211_band band)
 902 {
 903         struct ieee80211_supported_band *sband;
 904         struct ieee80211_rate *bitrates;
 905         size_t num_rates;
 906         u32 supp_rates;
 907         int i, j;
 908         sband = local->hw.wiphy->bands[band];
 909
 910         if (!sband) {
 911                 WARN_ON(1);
 912                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 913         }
 914
 915         bitrates = sband->bitrates;
 916         num_rates = sband->n_bitrates;
 917         supp_rates = 0;
 918         for (i = 0; i < elems->supp_rates_len +
 919                      elems->ext_supp_rates_len; i++) {
 920                 u8 rate = 0;
 921                 int own_rate;
 922                 if (i < elems->supp_rates_len)
 923                         rate = elems->supp_rates[i];
 924                 else if (elems->ext_supp_rates)
 925                         rate = elems->ext_supp_rates
 926                                 [i - elems->supp_rates_len];
 927                 own_rate = 5 * (rate & 0x7f);
 928                 for (j = 0; j < num_rates; j++)
 929                         if (bitrates[j].bitrate == own_rate)
 930                                 supp_rates |= BIT(j);
 931         }
 932         return supp_rates;
 933 }