git.oblomov.eu Git - linux-2.6/blob - net/mac80211/util.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * utilities for mac80211
  12  */
  13
  14 #include <net/mac80211.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/bitmap.h>
  23 #include <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 ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
 170
 171         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 172         if (tx->extra_frag) {
 173                 struct ieee80211_hdr *fhdr;
 174                 int i;
 175                 for (i = 0; i < tx->num_extra_frag; i++) {
 176                         fhdr = (struct ieee80211_hdr *)
 177                                 tx->extra_frag[i]->data;
 178                         fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 179                 }
 180         }
 181 }
 182
 183 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 184                              int rate, int erp, int short_preamble)
 185 {
 186         int dur;
 187
 188         /* calculate duration (in microseconds, rounded up to next higher
 189          * integer if it includes a fractional microsecond) to send frame of
 190          * len bytes (does not include FCS) at the given rate. Duration will
 191          * also include SIFS.
 192          *
 193          * rate is in 100 kbps, so divident is multiplied by 10 in the
 194          * DIV_ROUND_UP() operations.
 195          */
 196
 197         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 198                 /*
 199                  * OFDM:
 200                  *
 201                  * N_DBPS = DATARATE x 4
 202                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 203                  *      (16 = SIGNAL time, 6 = tail bits)
 204                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 205                  *
 206                  * T_SYM = 4 usec
 207                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 208                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 209                  *      signal ext = 6 usec
 210                  */
 211                 dur = 16; /* SIFS + signal ext */
 212                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 213                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 214                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 215                                         4 * rate); /* T_SYM x N_SYM */
 216         } else {
 217                 /*
 218                  * 802.11b or 802.11g with 802.11b compatibility:
 219                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 220                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 221                  *
 222                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 223                  * aSIFSTime = 10 usec
 224                  * aPreambleLength = 144 usec or 72 usec with short preamble
 225                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 226                  */
 227                 dur = 10; /* aSIFSTime = 10 usec */
 228                 dur += short_preamble ? (72 + 24) : (144 + 48);
 229
 230                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 231         }
 232
 233         return dur;
 234 }
 235
 236 /* Exported duration function for driver use */
 237 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 238                                         struct ieee80211_vif *vif,
 239                                         size_t frame_len,
 240                                         struct ieee80211_rate *rate)
 241 {
 242         struct ieee80211_local *local = hw_to_local(hw);
 243         struct ieee80211_sub_if_data *sdata;
 244         u16 dur;
 245         int erp;
 246         bool short_preamble = false;
 247
 248         erp = 0;
 249         if (vif) {
 250                 sdata = vif_to_sdata(vif);
 251                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 252                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 253                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 254         }
 255
 256         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 257                                        short_preamble);
 258
 259         return cpu_to_le16(dur);
 260 }
 261 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 262
 263 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 264                               struct ieee80211_vif *vif, size_t frame_len,
 265                               const struct ieee80211_tx_info *frame_txctl)
 266 {
 267         struct ieee80211_local *local = hw_to_local(hw);
 268         struct ieee80211_rate *rate;
 269         struct ieee80211_sub_if_data *sdata;
 270         bool short_preamble;
 271         int erp;
 272         u16 dur;
 273         struct ieee80211_supported_band *sband;
 274
 275         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 276
 277         short_preamble = false;
 278
 279         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 280
 281         erp = 0;
 282         if (vif) {
 283                 sdata = vif_to_sdata(vif);
 284                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 285                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 286                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 287         }
 288
 289         /* CTS duration */
 290         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 291                                        erp, short_preamble);
 292         /* Data frame duration */
 293         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 294                                         erp, short_preamble);
 295         /* ACK duration */
 296         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 297                                         erp, short_preamble);
 298
 299         return cpu_to_le16(dur);
 300 }
 301 EXPORT_SYMBOL(ieee80211_rts_duration);
 302
 303 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 304                                     struct ieee80211_vif *vif,
 305                                     size_t frame_len,
 306                                     const struct ieee80211_tx_info *frame_txctl)
 307 {
 308         struct ieee80211_local *local = hw_to_local(hw);
 309         struct ieee80211_rate *rate;
 310         struct ieee80211_sub_if_data *sdata;
 311         bool short_preamble;
 312         int erp;
 313         u16 dur;
 314         struct ieee80211_supported_band *sband;
 315
 316         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 317
 318         short_preamble = false;
 319
 320         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 321         erp = 0;
 322         if (vif) {
 323                 sdata = vif_to_sdata(vif);
 324                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 325                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 326                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 327         }
 328
 329         /* Data frame duration */
 330         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 331                                        erp, short_preamble);
 332         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 333                 /* ACK duration */
 334                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 335                                                 erp, short_preamble);
 336         }
 337
 338         return cpu_to_le16(dur);
 339 }
 340 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 341
 342 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 343                                    enum queue_stop_reason reason)
 344 {
 345         struct ieee80211_local *local = hw_to_local(hw);
 346
 347         /* we don't need to track ampdu queues */
 348         if (queue < ieee80211_num_regular_queues(hw)) {
 349                 __clear_bit(reason, &local->queue_stop_reasons[queue]);
 350
 351                 if (local->queue_stop_reasons[queue] != 0)
 352                         /* someone still has this queue stopped */
 353                         return;
 354         }
 355
 356         if (test_bit(queue, local->queues_pending)) {
 357                 set_bit(queue, local->queues_pending_run);
 358                 tasklet_schedule(&local->tx_pending_tasklet);
 359         } else {
 360                 netif_wake_subqueue(local->mdev, queue);
 361         }
 362 }
 363
 364 static void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 365                                            enum queue_stop_reason reason)
 366 {
 367         struct ieee80211_local *local = hw_to_local(hw);
 368         unsigned long flags;
 369
 370         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 371         __ieee80211_wake_queue(hw, queue, reason);
 372         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 373 }
 374
 375 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 376 {
 377         ieee80211_wake_queue_by_reason(hw, queue,
 378                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 379 }
 380 EXPORT_SYMBOL(ieee80211_wake_queue);
 381
 382 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 383                                    enum queue_stop_reason reason)
 384 {
 385         struct ieee80211_local *local = hw_to_local(hw);
 386
 387         /* we don't need to track ampdu queues */
 388         if (queue < ieee80211_num_regular_queues(hw))
 389                 __set_bit(reason, &local->queue_stop_reasons[queue]);
 390
 391         netif_stop_subqueue(local->mdev, queue);
 392 }
 393
 394 static void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 395                                            enum queue_stop_reason reason)
 396 {
 397         struct ieee80211_local *local = hw_to_local(hw);
 398         unsigned long flags;
 399
 400         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 401         __ieee80211_stop_queue(hw, queue, reason);
 402         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 403 }
 404
 405 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 406 {
 407         ieee80211_stop_queue_by_reason(hw, queue,
 408                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 409 }
 410 EXPORT_SYMBOL(ieee80211_stop_queue);
 411
 412 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 413                                     enum queue_stop_reason reason)
 414 {
 415         struct ieee80211_local *local = hw_to_local(hw);
 416         unsigned long flags;
 417         int i;
 418
 419         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 420
 421         for (i = 0; i < ieee80211_num_queues(hw); i++)
 422                 __ieee80211_stop_queue(hw, i, reason);
 423
 424         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 425 }
 426
 427 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 428 {
 429         ieee80211_stop_queues_by_reason(hw,
 430                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 431 }
 432 EXPORT_SYMBOL(ieee80211_stop_queues);
 433
 434 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 435 {
 436         struct ieee80211_local *local = hw_to_local(hw);
 437         return __netif_subqueue_stopped(local->mdev, queue);
 438 }
 439 EXPORT_SYMBOL(ieee80211_queue_stopped);
 440
 441 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 442                                      enum queue_stop_reason reason)
 443 {
 444         struct ieee80211_local *local = hw_to_local(hw);
 445         unsigned long flags;
 446         int i;
 447
 448         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 449
 450         for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
 451                 __ieee80211_wake_queue(hw, i, reason);
 452
 453         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 454 }
 455
 456 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 457 {
 458         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 459 }
 460 EXPORT_SYMBOL(ieee80211_wake_queues);
 461
 462 void ieee80211_iterate_active_interfaces(
 463         struct ieee80211_hw *hw,
 464         void (*iterator)(void *data, u8 *mac,
 465                          struct ieee80211_vif *vif),
 466         void *data)
 467 {
 468         struct ieee80211_local *local = hw_to_local(hw);
 469         struct ieee80211_sub_if_data *sdata;
 470
 471         mutex_lock(&local->iflist_mtx);
 472
 473         list_for_each_entry(sdata, &local->interfaces, list) {
 474                 switch (sdata->vif.type) {
 475                 case __NL80211_IFTYPE_AFTER_LAST:
 476                 case NL80211_IFTYPE_UNSPECIFIED:
 477                 case NL80211_IFTYPE_MONITOR:
 478                 case NL80211_IFTYPE_AP_VLAN:
 479                         continue;
 480                 case NL80211_IFTYPE_AP:
 481                 case NL80211_IFTYPE_STATION:
 482                 case NL80211_IFTYPE_ADHOC:
 483                 case NL80211_IFTYPE_WDS:
 484                 case NL80211_IFTYPE_MESH_POINT:
 485                         break;
 486                 }
 487                 if (netif_running(sdata->dev))
 488                         iterator(data, sdata->dev->dev_addr,
 489                                  &sdata->vif);
 490         }
 491
 492         mutex_unlock(&local->iflist_mtx);
 493 }
 494 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 495
 496 void ieee80211_iterate_active_interfaces_atomic(
 497         struct ieee80211_hw *hw,
 498         void (*iterator)(void *data, u8 *mac,
 499                          struct ieee80211_vif *vif),
 500         void *data)
 501 {
 502         struct ieee80211_local *local = hw_to_local(hw);
 503         struct ieee80211_sub_if_data *sdata;
 504
 505         rcu_read_lock();
 506
 507         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 508                 switch (sdata->vif.type) {
 509                 case __NL80211_IFTYPE_AFTER_LAST:
 510                 case NL80211_IFTYPE_UNSPECIFIED:
 511                 case NL80211_IFTYPE_MONITOR:
 512                 case NL80211_IFTYPE_AP_VLAN:
 513                         continue;
 514                 case NL80211_IFTYPE_AP:
 515                 case NL80211_IFTYPE_STATION:
 516                 case NL80211_IFTYPE_ADHOC:
 517                 case NL80211_IFTYPE_WDS:
 518                 case NL80211_IFTYPE_MESH_POINT:
 519                         break;
 520                 }
 521                 if (netif_running(sdata->dev))
 522                         iterator(data, sdata->dev->dev_addr,
 523                                  &sdata->vif);
 524         }
 525
 526         rcu_read_unlock();
 527 }
 528 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 529
 530 void ieee802_11_parse_elems(u8 *start, size_t len,
 531                             struct ieee802_11_elems *elems)
 532 {
 533         size_t left = len;
 534         u8 *pos = start;
 535
 536         memset(elems, 0, sizeof(*elems));
 537         elems->ie_start = start;
 538         elems->total_len = len;
 539
 540         while (left >= 2) {
 541                 u8 id, elen;
 542
 543                 id = *pos++;
 544                 elen = *pos++;
 545                 left -= 2;
 546
 547                 if (elen > left)
 548                         return;
 549
 550                 switch (id) {
 551                 case WLAN_EID_SSID:
 552                         elems->ssid = pos;
 553                         elems->ssid_len = elen;
 554                         break;
 555                 case WLAN_EID_SUPP_RATES:
 556                         elems->supp_rates = pos;
 557                         elems->supp_rates_len = elen;
 558                         break;
 559                 case WLAN_EID_FH_PARAMS:
 560                         elems->fh_params = pos;
 561                         elems->fh_params_len = elen;
 562                         break;
 563                 case WLAN_EID_DS_PARAMS:
 564                         elems->ds_params = pos;
 565                         elems->ds_params_len = elen;
 566                         break;
 567                 case WLAN_EID_CF_PARAMS:
 568                         elems->cf_params = pos;
 569                         elems->cf_params_len = elen;
 570                         break;
 571                 case WLAN_EID_TIM:
 572                         elems->tim = pos;
 573                         elems->tim_len = elen;
 574                         break;
 575                 case WLAN_EID_IBSS_PARAMS:
 576                         elems->ibss_params = pos;
 577                         elems->ibss_params_len = elen;
 578                         break;
 579                 case WLAN_EID_CHALLENGE:
 580                         elems->challenge = pos;
 581                         elems->challenge_len = elen;
 582                         break;
 583                 case WLAN_EID_WPA:
 584                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 585                             pos[2] == 0xf2) {
 586                                 /* Microsoft OUI (00:50:F2) */
 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                                         if (pos[4] == 0) {
 593                                                 elems->wmm_info = pos;
 594                                                 elems->wmm_info_len = elen;
 595                                         } else if (pos[4] == 1) {
 596                                                 elems->wmm_param = pos;
 597                                                 elems->wmm_param_len = elen;
 598                                         }
 599                                 }
 600                         }
 601                         break;
 602                 case WLAN_EID_RSN:
 603                         elems->rsn = pos;
 604                         elems->rsn_len = elen;
 605                         break;
 606                 case WLAN_EID_ERP_INFO:
 607                         elems->erp_info = pos;
 608                         elems->erp_info_len = elen;
 609                         break;
 610                 case WLAN_EID_EXT_SUPP_RATES:
 611                         elems->ext_supp_rates = pos;
 612                         elems->ext_supp_rates_len = elen;
 613                         break;
 614                 case WLAN_EID_HT_CAPABILITY:
 615                         if (elen >= sizeof(struct ieee80211_ht_cap))
 616                                 elems->ht_cap_elem = (void *)pos;
 617                         break;
 618                 case WLAN_EID_HT_INFORMATION:
 619                         if (elen >= sizeof(struct ieee80211_ht_info))
 620                                 elems->ht_info_elem = (void *)pos;
 621                         break;
 622                 case WLAN_EID_MESH_ID:
 623                         elems->mesh_id = pos;
 624                         elems->mesh_id_len = elen;
 625                         break;
 626                 case WLAN_EID_MESH_CONFIG:
 627                         elems->mesh_config = pos;
 628                         elems->mesh_config_len = elen;
 629                         break;
 630                 case WLAN_EID_PEER_LINK:
 631                         elems->peer_link = pos;
 632                         elems->peer_link_len = elen;
 633                         break;
 634                 case WLAN_EID_PREQ:
 635                         elems->preq = pos;
 636                         elems->preq_len = elen;
 637                         break;
 638                 case WLAN_EID_PREP:
 639                         elems->prep = pos;
 640                         elems->prep_len = elen;
 641                         break;
 642                 case WLAN_EID_PERR:
 643                         elems->perr = pos;
 644                         elems->perr_len = elen;
 645                         break;
 646                 case WLAN_EID_CHANNEL_SWITCH:
 647                         elems->ch_switch_elem = pos;
 648                         elems->ch_switch_elem_len = elen;
 649                         break;
 650                 case WLAN_EID_QUIET:
 651                         if (!elems->quiet_elem) {
 652                                 elems->quiet_elem = pos;
 653                                 elems->quiet_elem_len = elen;
 654                         }
 655                         elems->num_of_quiet_elem++;
 656                         break;
 657                 case WLAN_EID_COUNTRY:
 658                         elems->country_elem = pos;
 659                         elems->country_elem_len = elen;
 660                         break;
 661                 case WLAN_EID_PWR_CONSTRAINT:
 662                         elems->pwr_constr_elem = pos;
 663                         elems->pwr_constr_elem_len = elen;
 664                         break;
 665                 case WLAN_EID_TIMEOUT_INTERVAL:
 666                         elems->timeout_int = pos;
 667                         elems->timeout_int_len = elen;
 668                         break;
 669                 default:
 670                         break;
 671                 }
 672
 673                 left -= elen;
 674                 pos += elen;
 675         }
 676 }
 677
 678 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 679 {
 680         struct ieee80211_local *local = sdata->local;
 681         struct ieee80211_tx_queue_params qparam;
 682         int i;
 683
 684         if (!local->ops->conf_tx)
 685                 return;
 686
 687         memset(&qparam, 0, sizeof(qparam));
 688
 689         qparam.aifs = 2;
 690
 691         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 692             !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
 693                 qparam.cw_min = 31;
 694         else
 695                 qparam.cw_min = 15;
 696
 697         qparam.cw_max = 1023;
 698         qparam.txop = 0;
 699
 700         for (i = 0; i < local_to_hw(local)->queues; i++)
 701                 local->ops->conf_tx(local_to_hw(local), i, &qparam);
 702 }
 703
 704 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 705                       int encrypt)
 706 {
 707         skb->dev = sdata->local->mdev;
 708         skb_set_mac_header(skb, 0);
 709         skb_set_network_header(skb, 0);
 710         skb_set_transport_header(skb, 0);
 711
 712         skb->iif = sdata->dev->ifindex;
 713         skb->do_not_encrypt = !encrypt;
 714
 715         dev_queue_xmit(skb);
 716 }
 717
 718 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
 719 {
 720         int ret = -EINVAL;
 721         struct ieee80211_channel *chan;
 722         struct ieee80211_local *local = sdata->local;
 723
 724         chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
 725
 726         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
 727                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 728                     chan->flags & IEEE80211_CHAN_NO_IBSS)
 729                         return ret;
 730                 local->oper_channel = chan;
 731                 local->oper_channel_type = NL80211_CHAN_NO_HT;
 732
 733                 if (local->sw_scanning || local->hw_scanning)
 734                         ret = 0;
 735                 else
 736                         ret = ieee80211_hw_config(
 737                                 local, IEEE80211_CONF_CHANGE_CHANNEL);
 738         }
 739
 740         return ret;
 741 }
 742
 743 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 744                               enum ieee80211_band band)
 745 {
 746         struct ieee80211_supported_band *sband;
 747         struct ieee80211_rate *bitrates;
 748         u32 mandatory_rates;
 749         enum ieee80211_rate_flags mandatory_flag;
 750         int i;
 751
 752         sband = local->hw.wiphy->bands[band];
 753         if (!sband) {
 754                 WARN_ON(1);
 755                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 756         }
 757
 758         if (band == IEEE80211_BAND_2GHZ)
 759                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 760         else
 761                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 762
 763         bitrates = sband->bitrates;
 764         mandatory_rates = 0;
 765         for (i = 0; i < sband->n_bitrates; i++)
 766                 if (bitrates[i].flags & mandatory_flag)
 767                         mandatory_rates |= BIT(i);
 768         return mandatory_rates;
 769 }