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
  45 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  46                         enum nl80211_iftype type)
  47 {
  48         __le16 fc = hdr->frame_control;
  49
  50          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  51         if (len < 16)
  52                 return NULL;
  53
  54         if (ieee80211_is_data(fc)) {
  55                 if (len < 24) /* drop incorrect hdr len (data) */
  56                         return NULL;
  57
  58                 if (ieee80211_has_a4(fc))
  59                         return NULL;
  60                 if (ieee80211_has_tods(fc))
  61                         return hdr->addr1;
  62                 if (ieee80211_has_fromds(fc))
  63                         return hdr->addr2;
  64
  65                 return hdr->addr3;
  66         }
  67
  68         if (ieee80211_is_mgmt(fc)) {
  69                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  70                         return NULL;
  71                 return hdr->addr3;
  72         }
  73
  74         if (ieee80211_is_ctl(fc)) {
  75                 if(ieee80211_is_pspoll(fc))
  76                         return hdr->addr1;
  77
  78                 if (ieee80211_is_back_req(fc)) {
  79                         switch (type) {
  80                         case NL80211_IFTYPE_STATION:
  81                                 return hdr->addr2;
  82                         case NL80211_IFTYPE_AP:
  83                         case NL80211_IFTYPE_AP_VLAN:
  84                                 return hdr->addr1;
  85                         default:
  86                                 break; /* fall through to the return */
  87                         }
  88                 }
  89         }
  90
  91         return NULL;
  92 }
  93
  94 unsigned int ieee80211_hdrlen(__le16 fc)
  95 {
  96         unsigned int hdrlen = 24;
  97
  98         if (ieee80211_is_data(fc)) {
  99                 if (ieee80211_has_a4(fc))
 100                         hdrlen = 30;
 101                 if (ieee80211_is_data_qos(fc))
 102                         hdrlen += IEEE80211_QOS_CTL_LEN;
 103                 goto out;
 104         }
 105
 106         if (ieee80211_is_ctl(fc)) {
 107                 /*
 108                  * ACK and CTS are 10 bytes, all others 16. To see how
 109                  * to get this condition consider
 110                  *   subtype mask:   0b0000000011110000 (0x00F0)
 111                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 112                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 113                  *   bits that matter:         ^^^      (0x00E0)
 114                  *   value of those: 0b0000000011000000 (0x00C0)
 115                  */
 116                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 117                         hdrlen = 10;
 118                 else
 119                         hdrlen = 16;
 120         }
 121 out:
 122         return hdrlen;
 123 }
 124 EXPORT_SYMBOL(ieee80211_hdrlen);
 125
 126 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 127 {
 128         const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
 129         unsigned int hdrlen;
 130
 131         if (unlikely(skb->len < 10))
 132                 return 0;
 133         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 134         if (unlikely(hdrlen > skb->len))
 135                 return 0;
 136         return hdrlen;
 137 }
 138 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 139
 140 int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 141 {
 142         int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
 143         /* 7.1.3.5a.2 */
 144         switch (ae) {
 145         case 0:
 146                 return 6;
 147         case 1:
 148                 return 12;
 149         case 2:
 150                 return 18;
 151         case 3:
 152                 return 24;
 153         default:
 154                 return 6;
 155         }
 156 }
 157
 158 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
 159 {
 160         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
 161
 162         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 163         if (tx->extra_frag) {
 164                 struct ieee80211_hdr *fhdr;
 165                 int i;
 166                 for (i = 0; i < tx->num_extra_frag; i++) {
 167                         fhdr = (struct ieee80211_hdr *)
 168                                 tx->extra_frag[i]->data;
 169                         fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 170                 }
 171         }
 172 }
 173
 174 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 175                              int rate, int erp, int short_preamble)
 176 {
 177         int dur;
 178
 179         /* calculate duration (in microseconds, rounded up to next higher
 180          * integer if it includes a fractional microsecond) to send frame of
 181          * len bytes (does not include FCS) at the given rate. Duration will
 182          * also include SIFS.
 183          *
 184          * rate is in 100 kbps, so divident is multiplied by 10 in the
 185          * DIV_ROUND_UP() operations.
 186          */
 187
 188         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 189                 /*
 190                  * OFDM:
 191                  *
 192                  * N_DBPS = DATARATE x 4
 193                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 194                  *      (16 = SIGNAL time, 6 = tail bits)
 195                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 196                  *
 197                  * T_SYM = 4 usec
 198                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 199                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 200                  *      signal ext = 6 usec
 201                  */
 202                 dur = 16; /* SIFS + signal ext */
 203                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 204                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 205                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 206                                         4 * rate); /* T_SYM x N_SYM */
 207         } else {
 208                 /*
 209                  * 802.11b or 802.11g with 802.11b compatibility:
 210                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 211                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 212                  *
 213                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 214                  * aSIFSTime = 10 usec
 215                  * aPreambleLength = 144 usec or 72 usec with short preamble
 216                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 217                  */
 218                 dur = 10; /* aSIFSTime = 10 usec */
 219                 dur += short_preamble ? (72 + 24) : (144 + 48);
 220
 221                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 222         }
 223
 224         return dur;
 225 }
 226
 227 /* Exported duration function for driver use */
 228 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 229                                         struct ieee80211_vif *vif,
 230                                         size_t frame_len,
 231                                         struct ieee80211_rate *rate)
 232 {
 233         struct ieee80211_local *local = hw_to_local(hw);
 234         struct ieee80211_sub_if_data *sdata;
 235         u16 dur;
 236         int erp;
 237         bool short_preamble = false;
 238
 239         erp = 0;
 240         if (vif) {
 241                 sdata = vif_to_sdata(vif);
 242                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 243                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 244                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 245         }
 246
 247         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 248                                        short_preamble);
 249
 250         return cpu_to_le16(dur);
 251 }
 252 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 253
 254 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 255                               struct ieee80211_vif *vif, size_t frame_len,
 256                               const struct ieee80211_tx_info *frame_txctl)
 257 {
 258         struct ieee80211_local *local = hw_to_local(hw);
 259         struct ieee80211_rate *rate;
 260         struct ieee80211_sub_if_data *sdata;
 261         bool short_preamble;
 262         int erp;
 263         u16 dur;
 264         struct ieee80211_supported_band *sband;
 265
 266         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 267
 268         short_preamble = false;
 269
 270         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 271
 272         erp = 0;
 273         if (vif) {
 274                 sdata = vif_to_sdata(vif);
 275                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 276                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 277                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 278         }
 279
 280         /* CTS duration */
 281         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 282                                        erp, short_preamble);
 283         /* Data frame duration */
 284         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 285                                         erp, short_preamble);
 286         /* ACK duration */
 287         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 288                                         erp, short_preamble);
 289
 290         return cpu_to_le16(dur);
 291 }
 292 EXPORT_SYMBOL(ieee80211_rts_duration);
 293
 294 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 295                                     struct ieee80211_vif *vif,
 296                                     size_t frame_len,
 297                                     const struct ieee80211_tx_info *frame_txctl)
 298 {
 299         struct ieee80211_local *local = hw_to_local(hw);
 300         struct ieee80211_rate *rate;
 301         struct ieee80211_sub_if_data *sdata;
 302         bool short_preamble;
 303         int erp;
 304         u16 dur;
 305         struct ieee80211_supported_band *sband;
 306
 307         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 308
 309         short_preamble = false;
 310
 311         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 312         erp = 0;
 313         if (vif) {
 314                 sdata = vif_to_sdata(vif);
 315                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 316                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 317                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 318         }
 319
 320         /* Data frame duration */
 321         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 322                                        erp, short_preamble);
 323         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 324                 /* ACK duration */
 325                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 326                                                 erp, short_preamble);
 327         }
 328
 329         return cpu_to_le16(dur);
 330 }
 331 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 332
 333 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 334                                    enum queue_stop_reason reason)
 335 {
 336         struct ieee80211_local *local = hw_to_local(hw);
 337
 338         /* we don't need to track ampdu queues */
 339         if (queue < ieee80211_num_regular_queues(hw)) {
 340                 __clear_bit(reason, &local->queue_stop_reasons[queue]);
 341
 342                 if (local->queue_stop_reasons[queue] != 0)
 343                         /* someone still has this queue stopped */
 344                         return;
 345         }
 346
 347         if (test_bit(queue, local->queues_pending)) {
 348                 set_bit(queue, local->queues_pending_run);
 349                 tasklet_schedule(&local->tx_pending_tasklet);
 350         } else {
 351                 netif_wake_subqueue(local->mdev, queue);
 352         }
 353 }
 354
 355 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 356                                     enum queue_stop_reason reason)
 357 {
 358         struct ieee80211_local *local = hw_to_local(hw);
 359         unsigned long flags;
 360
 361         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 362         __ieee80211_wake_queue(hw, queue, reason);
 363         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 364 }
 365
 366 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 367 {
 368         ieee80211_wake_queue_by_reason(hw, queue,
 369                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 370 }
 371 EXPORT_SYMBOL(ieee80211_wake_queue);
 372
 373 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 374                                    enum queue_stop_reason reason)
 375 {
 376         struct ieee80211_local *local = hw_to_local(hw);
 377
 378         /* we don't need to track ampdu queues */
 379         if (queue < ieee80211_num_regular_queues(hw))
 380                 __set_bit(reason, &local->queue_stop_reasons[queue]);
 381
 382         netif_stop_subqueue(local->mdev, queue);
 383 }
 384
 385 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 386                                     enum queue_stop_reason reason)
 387 {
 388         struct ieee80211_local *local = hw_to_local(hw);
 389         unsigned long flags;
 390
 391         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 392         __ieee80211_stop_queue(hw, queue, reason);
 393         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 394 }
 395
 396 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 397 {
 398         ieee80211_stop_queue_by_reason(hw, queue,
 399                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 400 }
 401 EXPORT_SYMBOL(ieee80211_stop_queue);
 402
 403 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 404                                     enum queue_stop_reason reason)
 405 {
 406         struct ieee80211_local *local = hw_to_local(hw);
 407         unsigned long flags;
 408         int i;
 409
 410         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 411
 412         for (i = 0; i < ieee80211_num_queues(hw); i++)
 413                 __ieee80211_stop_queue(hw, i, reason);
 414
 415         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 416 }
 417
 418 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 419 {
 420         ieee80211_stop_queues_by_reason(hw,
 421                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 422 }
 423 EXPORT_SYMBOL(ieee80211_stop_queues);
 424
 425 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 426 {
 427         struct ieee80211_local *local = hw_to_local(hw);
 428         return __netif_subqueue_stopped(local->mdev, queue);
 429 }
 430 EXPORT_SYMBOL(ieee80211_queue_stopped);
 431
 432 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 433                                      enum queue_stop_reason reason)
 434 {
 435         struct ieee80211_local *local = hw_to_local(hw);
 436         unsigned long flags;
 437         int i;
 438
 439         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 440
 441         for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
 442                 __ieee80211_wake_queue(hw, i, reason);
 443
 444         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 445 }
 446
 447 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 448 {
 449         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 450 }
 451 EXPORT_SYMBOL(ieee80211_wake_queues);
 452
 453 void ieee80211_iterate_active_interfaces(
 454         struct ieee80211_hw *hw,
 455         void (*iterator)(void *data, u8 *mac,
 456                          struct ieee80211_vif *vif),
 457         void *data)
 458 {
 459         struct ieee80211_local *local = hw_to_local(hw);
 460         struct ieee80211_sub_if_data *sdata;
 461
 462         rtnl_lock();
 463
 464         list_for_each_entry(sdata, &local->interfaces, list) {
 465                 switch (sdata->vif.type) {
 466                 case __NL80211_IFTYPE_AFTER_LAST:
 467                 case NL80211_IFTYPE_UNSPECIFIED:
 468                 case NL80211_IFTYPE_MONITOR:
 469                 case NL80211_IFTYPE_AP_VLAN:
 470                         continue;
 471                 case NL80211_IFTYPE_AP:
 472                 case NL80211_IFTYPE_STATION:
 473                 case NL80211_IFTYPE_ADHOC:
 474                 case NL80211_IFTYPE_WDS:
 475                 case NL80211_IFTYPE_MESH_POINT:
 476                         break;
 477                 }
 478                 if (netif_running(sdata->dev))
 479                         iterator(data, sdata->dev->dev_addr,
 480                                  &sdata->vif);
 481         }
 482
 483         rtnl_unlock();
 484 }
 485 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 486
 487 void ieee80211_iterate_active_interfaces_atomic(
 488         struct ieee80211_hw *hw,
 489         void (*iterator)(void *data, u8 *mac,
 490                          struct ieee80211_vif *vif),
 491         void *data)
 492 {
 493         struct ieee80211_local *local = hw_to_local(hw);
 494         struct ieee80211_sub_if_data *sdata;
 495
 496         rcu_read_lock();
 497
 498         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 499                 switch (sdata->vif.type) {
 500                 case __NL80211_IFTYPE_AFTER_LAST:
 501                 case NL80211_IFTYPE_UNSPECIFIED:
 502                 case NL80211_IFTYPE_MONITOR:
 503                 case NL80211_IFTYPE_AP_VLAN:
 504                         continue;
 505                 case NL80211_IFTYPE_AP:
 506                 case NL80211_IFTYPE_STATION:
 507                 case NL80211_IFTYPE_ADHOC:
 508                 case NL80211_IFTYPE_WDS:
 509                 case NL80211_IFTYPE_MESH_POINT:
 510                         break;
 511                 }
 512                 if (netif_running(sdata->dev))
 513                         iterator(data, sdata->dev->dev_addr,
 514                                  &sdata->vif);
 515         }
 516
 517         rcu_read_unlock();
 518 }
 519 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 520
 521 void ieee802_11_parse_elems(u8 *start, size_t len,
 522                             struct ieee802_11_elems *elems)
 523 {
 524         size_t left = len;
 525         u8 *pos = start;
 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                         return;
 540
 541                 switch (id) {
 542                 case WLAN_EID_SSID:
 543                         elems->ssid = pos;
 544                         elems->ssid_len = elen;
 545                         break;
 546                 case WLAN_EID_SUPP_RATES:
 547                         elems->supp_rates = pos;
 548                         elems->supp_rates_len = elen;
 549                         break;
 550                 case WLAN_EID_FH_PARAMS:
 551                         elems->fh_params = pos;
 552                         elems->fh_params_len = elen;
 553                         break;
 554                 case WLAN_EID_DS_PARAMS:
 555                         elems->ds_params = pos;
 556                         elems->ds_params_len = elen;
 557                         break;
 558                 case WLAN_EID_CF_PARAMS:
 559                         elems->cf_params = pos;
 560                         elems->cf_params_len = elen;
 561                         break;
 562                 case WLAN_EID_TIM:
 563                         elems->tim = pos;
 564                         elems->tim_len = elen;
 565                         break;
 566                 case WLAN_EID_IBSS_PARAMS:
 567                         elems->ibss_params = pos;
 568                         elems->ibss_params_len = elen;
 569                         break;
 570                 case WLAN_EID_CHALLENGE:
 571                         elems->challenge = pos;
 572                         elems->challenge_len = elen;
 573                         break;
 574                 case WLAN_EID_WPA:
 575                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 576                             pos[2] == 0xf2) {
 577                                 /* Microsoft OUI (00:50:F2) */
 578                                 if (pos[3] == 1) {
 579                                         /* OUI Type 1 - WPA IE */
 580                                         elems->wpa = pos;
 581                                         elems->wpa_len = elen;
 582                                 } else if (elen >= 5 && pos[3] == 2) {
 583                                         if (pos[4] == 0) {
 584                                                 elems->wmm_info = pos;
 585                                                 elems->wmm_info_len = elen;
 586                                         } else if (pos[4] == 1) {
 587                                                 elems->wmm_param = pos;
 588                                                 elems->wmm_param_len = elen;
 589                                         }
 590                                 }
 591                         }
 592                         break;
 593                 case WLAN_EID_RSN:
 594                         elems->rsn = pos;
 595                         elems->rsn_len = elen;
 596                         break;
 597                 case WLAN_EID_ERP_INFO:
 598                         elems->erp_info = pos;
 599                         elems->erp_info_len = elen;
 600                         break;
 601                 case WLAN_EID_EXT_SUPP_RATES:
 602                         elems->ext_supp_rates = pos;
 603                         elems->ext_supp_rates_len = elen;
 604                         break;
 605                 case WLAN_EID_HT_CAPABILITY:
 606                         if (elen >= sizeof(struct ieee80211_ht_cap))
 607                                 elems->ht_cap_elem = (void *)pos;
 608                         break;
 609                 case WLAN_EID_HT_INFORMATION:
 610                         if (elen >= sizeof(struct ieee80211_ht_info))
 611                                 elems->ht_info_elem = (void *)pos;
 612                         break;
 613                 case WLAN_EID_MESH_ID:
 614                         elems->mesh_id = pos;
 615                         elems->mesh_id_len = elen;
 616                         break;
 617                 case WLAN_EID_MESH_CONFIG:
 618                         elems->mesh_config = pos;
 619                         elems->mesh_config_len = elen;
 620                         break;
 621                 case WLAN_EID_PEER_LINK:
 622                         elems->peer_link = pos;
 623                         elems->peer_link_len = elen;
 624                         break;
 625                 case WLAN_EID_PREQ:
 626                         elems->preq = pos;
 627                         elems->preq_len = elen;
 628                         break;
 629                 case WLAN_EID_PREP:
 630                         elems->prep = pos;
 631                         elems->prep_len = elen;
 632                         break;
 633                 case WLAN_EID_PERR:
 634                         elems->perr = pos;
 635                         elems->perr_len = elen;
 636                         break;
 637                 case WLAN_EID_CHANNEL_SWITCH:
 638                         elems->ch_switch_elem = pos;
 639                         elems->ch_switch_elem_len = elen;
 640                         break;
 641                 case WLAN_EID_QUIET:
 642                         if (!elems->quiet_elem) {
 643                                 elems->quiet_elem = pos;
 644                                 elems->quiet_elem_len = elen;
 645                         }
 646                         elems->num_of_quiet_elem++;
 647                         break;
 648                 case WLAN_EID_COUNTRY:
 649                         elems->country_elem = pos;
 650                         elems->country_elem_len = elen;
 651                         break;
 652                 case WLAN_EID_PWR_CONSTRAINT:
 653                         elems->pwr_constr_elem = pos;
 654                         elems->pwr_constr_elem_len = elen;
 655                         break;
 656                 default:
 657                         break;
 658                 }
 659
 660                 left -= elen;
 661                 pos += elen;
 662         }
 663 }
 664
 665 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 666 {
 667         struct ieee80211_local *local = sdata->local;
 668         struct ieee80211_tx_queue_params qparam;
 669         int i;
 670
 671         if (!local->ops->conf_tx)
 672                 return;
 673
 674         memset(&qparam, 0, sizeof(qparam));
 675
 676         qparam.aifs = 2;
 677
 678         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 679             !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
 680                 qparam.cw_min = 31;
 681         else
 682                 qparam.cw_min = 15;
 683
 684         qparam.cw_max = 1023;
 685         qparam.txop = 0;
 686
 687         for (i = 0; i < local_to_hw(local)->queues; i++)
 688                 local->ops->conf_tx(local_to_hw(local), i, &qparam);
 689 }
 690
 691 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 692                       int encrypt)
 693 {
 694         skb->dev = sdata->local->mdev;
 695         skb_set_mac_header(skb, 0);
 696         skb_set_network_header(skb, 0);
 697         skb_set_transport_header(skb, 0);
 698
 699         skb->iif = sdata->dev->ifindex;
 700         skb->do_not_encrypt = !encrypt;
 701
 702         dev_queue_xmit(skb);
 703 }
 704
 705 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
 706 {
 707         int ret = -EINVAL;
 708         struct ieee80211_channel *chan;
 709         struct ieee80211_local *local = sdata->local;
 710
 711         chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
 712
 713         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
 714                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 715                     chan->flags & IEEE80211_CHAN_NO_IBSS)
 716                         return ret;
 717                 local->oper_channel = chan;
 718                 local->oper_channel_type = NL80211_CHAN_NO_HT;
 719
 720                 if (local->sw_scanning || local->hw_scanning)
 721                         ret = 0;
 722                 else
 723                         ret = ieee80211_hw_config(
 724                                 local, IEEE80211_CONF_CHANGE_CHANNEL);
 725         }
 726
 727         return ret;
 728 }
 729
 730 u64 ieee80211_mandatory_rates(struct ieee80211_local *local,
 731                               enum ieee80211_band band)
 732 {
 733         struct ieee80211_supported_band *sband;
 734         struct ieee80211_rate *bitrates;
 735         u64 mandatory_rates;
 736         enum ieee80211_rate_flags mandatory_flag;
 737         int i;
 738
 739         sband = local->hw.wiphy->bands[band];
 740         if (!sband) {
 741                 WARN_ON(1);
 742                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 743         }
 744
 745         if (band == IEEE80211_BAND_2GHZ)
 746                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 747         else
 748                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 749
 750         bitrates = sband->bitrates;
 751         mandatory_rates = 0;
 752         for (i = 0; i < sband->n_bitrates; i++)
 753                 if (bitrates[i].flags & mandatory_flag)
 754                         mandatory_rates |= BIT(i);
 755         return mandatory_rates;
 756 }