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 (queue >= hw->queues) {
 343                 if (local->ampdu_ac_queue[queue - hw->queues] < 0)
 344                         return;
 345
 346                 /*
 347                  * for virtual aggregation queues, we need to refcount the
 348                  * internal mac80211 disable (multiple times!), keep track of
 349                  * driver disable _and_ make sure the regular queue is
 350                  * actually enabled.
 351                  */
 352                 if (reason == IEEE80211_QUEUE_STOP_REASON_AGGREGATION)
 353                         local->amdpu_ac_stop_refcnt[queue - hw->queues]--;
 354                 else
 355                         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 356
 357                 if (local->queue_stop_reasons[queue] ||
 358                     local->amdpu_ac_stop_refcnt[queue - hw->queues])
 359                         return;
 360
 361                 /* now go on to treat the corresponding regular queue */
 362                 queue = local->ampdu_ac_queue[queue - hw->queues];
 363                 reason = IEEE80211_QUEUE_STOP_REASON_AGGREGATION;
 364         }
 365
 366         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 367
 368         if (!skb_queue_empty(&local->pending[queue]) &&
 369             local->queue_stop_reasons[queue] ==
 370                                 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
 371                 tasklet_schedule(&local->tx_pending_tasklet);
 372
 373         if (local->queue_stop_reasons[queue] != 0)
 374                 /* someone still has this queue stopped */
 375                 return;
 376
 377         netif_wake_subqueue(local->mdev, queue);
 378 }
 379
 380 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 381                                     enum queue_stop_reason reason)
 382 {
 383         struct ieee80211_local *local = hw_to_local(hw);
 384         unsigned long flags;
 385
 386         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 387         __ieee80211_wake_queue(hw, queue, reason);
 388         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 389 }
 390
 391 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 392 {
 393         ieee80211_wake_queue_by_reason(hw, queue,
 394                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 395 }
 396 EXPORT_SYMBOL(ieee80211_wake_queue);
 397
 398 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 399                                    enum queue_stop_reason reason)
 400 {
 401         struct ieee80211_local *local = hw_to_local(hw);
 402
 403         if (queue >= hw->queues) {
 404                 if (local->ampdu_ac_queue[queue - hw->queues] < 0)
 405                         return;
 406
 407                 /*
 408                  * for virtual aggregation queues, we need to refcount the
 409                  * internal mac80211 disable (multiple times!), keep track of
 410                  * driver disable _and_ make sure the regular queue is
 411                  * actually enabled.
 412                  */
 413                 if (reason == IEEE80211_QUEUE_STOP_REASON_AGGREGATION)
 414                         local->amdpu_ac_stop_refcnt[queue - hw->queues]++;
 415                 else
 416                         __set_bit(reason, &local->queue_stop_reasons[queue]);
 417
 418                 /* now go on to treat the corresponding regular queue */
 419                 queue = local->ampdu_ac_queue[queue - hw->queues];
 420                 reason = IEEE80211_QUEUE_STOP_REASON_AGGREGATION;
 421         }
 422
 423         /*
 424          * Only stop if it was previously running, this is necessary
 425          * for correct pending packets handling because there we may
 426          * start (but not wake) the queue and rely on that.
 427          */
 428         if (!local->queue_stop_reasons[queue])
 429                 netif_stop_subqueue(local->mdev, queue);
 430
 431         __set_bit(reason, &local->queue_stop_reasons[queue]);
 432 }
 433
 434 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 435                                     enum queue_stop_reason reason)
 436 {
 437         struct ieee80211_local *local = hw_to_local(hw);
 438         unsigned long flags;
 439
 440         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 441         __ieee80211_stop_queue(hw, queue, reason);
 442         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 443 }
 444
 445 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 446 {
 447         ieee80211_stop_queue_by_reason(hw, queue,
 448                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 449 }
 450 EXPORT_SYMBOL(ieee80211_stop_queue);
 451
 452 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 453                                     enum queue_stop_reason reason)
 454 {
 455         struct ieee80211_local *local = hw_to_local(hw);
 456         unsigned long flags;
 457         int i;
 458
 459         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 460
 461         for (i = 0; i < hw->queues; i++)
 462                 __ieee80211_stop_queue(hw, i, reason);
 463
 464         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 465 }
 466
 467 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 468 {
 469         ieee80211_stop_queues_by_reason(hw,
 470                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 471 }
 472 EXPORT_SYMBOL(ieee80211_stop_queues);
 473
 474 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 475 {
 476         struct ieee80211_local *local = hw_to_local(hw);
 477         unsigned long flags;
 478
 479         if (queue >= hw->queues) {
 480                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 481                 queue = local->ampdu_ac_queue[queue - hw->queues];
 482                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 483                 if (queue < 0)
 484                         return true;
 485         }
 486
 487         return __netif_subqueue_stopped(local->mdev, queue);
 488 }
 489 EXPORT_SYMBOL(ieee80211_queue_stopped);
 490
 491 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 492                                      enum queue_stop_reason reason)
 493 {
 494         struct ieee80211_local *local = hw_to_local(hw);
 495         unsigned long flags;
 496         int i;
 497
 498         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 499
 500         for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
 501                 __ieee80211_wake_queue(hw, i, reason);
 502
 503         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 504 }
 505
 506 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 507 {
 508         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 509 }
 510 EXPORT_SYMBOL(ieee80211_wake_queues);
 511
 512 void ieee80211_iterate_active_interfaces(
 513         struct ieee80211_hw *hw,
 514         void (*iterator)(void *data, u8 *mac,
 515                          struct ieee80211_vif *vif),
 516         void *data)
 517 {
 518         struct ieee80211_local *local = hw_to_local(hw);
 519         struct ieee80211_sub_if_data *sdata;
 520
 521         mutex_lock(&local->iflist_mtx);
 522
 523         list_for_each_entry(sdata, &local->interfaces, list) {
 524                 switch (sdata->vif.type) {
 525                 case __NL80211_IFTYPE_AFTER_LAST:
 526                 case NL80211_IFTYPE_UNSPECIFIED:
 527                 case NL80211_IFTYPE_MONITOR:
 528                 case NL80211_IFTYPE_AP_VLAN:
 529                         continue;
 530                 case NL80211_IFTYPE_AP:
 531                 case NL80211_IFTYPE_STATION:
 532                 case NL80211_IFTYPE_ADHOC:
 533                 case NL80211_IFTYPE_WDS:
 534                 case NL80211_IFTYPE_MESH_POINT:
 535                         break;
 536                 }
 537                 if (netif_running(sdata->dev))
 538                         iterator(data, sdata->dev->dev_addr,
 539                                  &sdata->vif);
 540         }
 541
 542         mutex_unlock(&local->iflist_mtx);
 543 }
 544 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 545
 546 void ieee80211_iterate_active_interfaces_atomic(
 547         struct ieee80211_hw *hw,
 548         void (*iterator)(void *data, u8 *mac,
 549                          struct ieee80211_vif *vif),
 550         void *data)
 551 {
 552         struct ieee80211_local *local = hw_to_local(hw);
 553         struct ieee80211_sub_if_data *sdata;
 554
 555         rcu_read_lock();
 556
 557         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 558                 switch (sdata->vif.type) {
 559                 case __NL80211_IFTYPE_AFTER_LAST:
 560                 case NL80211_IFTYPE_UNSPECIFIED:
 561                 case NL80211_IFTYPE_MONITOR:
 562                 case NL80211_IFTYPE_AP_VLAN:
 563                         continue;
 564                 case NL80211_IFTYPE_AP:
 565                 case NL80211_IFTYPE_STATION:
 566                 case NL80211_IFTYPE_ADHOC:
 567                 case NL80211_IFTYPE_WDS:
 568                 case NL80211_IFTYPE_MESH_POINT:
 569                         break;
 570                 }
 571                 if (netif_running(sdata->dev))
 572                         iterator(data, sdata->dev->dev_addr,
 573                                  &sdata->vif);
 574         }
 575
 576         rcu_read_unlock();
 577 }
 578 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 579
 580 void ieee802_11_parse_elems(u8 *start, size_t len,
 581                             struct ieee802_11_elems *elems)
 582 {
 583         size_t left = len;
 584         u8 *pos = start;
 585
 586         memset(elems, 0, sizeof(*elems));
 587         elems->ie_start = start;
 588         elems->total_len = len;
 589
 590         while (left >= 2) {
 591                 u8 id, elen;
 592
 593                 id = *pos++;
 594                 elen = *pos++;
 595                 left -= 2;
 596
 597                 if (elen > left)
 598                         return;
 599
 600                 switch (id) {
 601                 case WLAN_EID_SSID:
 602                         elems->ssid = pos;
 603                         elems->ssid_len = elen;
 604                         break;
 605                 case WLAN_EID_SUPP_RATES:
 606                         elems->supp_rates = pos;
 607                         elems->supp_rates_len = elen;
 608                         break;
 609                 case WLAN_EID_FH_PARAMS:
 610                         elems->fh_params = pos;
 611                         elems->fh_params_len = elen;
 612                         break;
 613                 case WLAN_EID_DS_PARAMS:
 614                         elems->ds_params = pos;
 615                         elems->ds_params_len = elen;
 616                         break;
 617                 case WLAN_EID_CF_PARAMS:
 618                         elems->cf_params = pos;
 619                         elems->cf_params_len = elen;
 620                         break;
 621                 case WLAN_EID_TIM:
 622                         elems->tim = pos;
 623                         elems->tim_len = elen;
 624                         break;
 625                 case WLAN_EID_IBSS_PARAMS:
 626                         elems->ibss_params = pos;
 627                         elems->ibss_params_len = elen;
 628                         break;
 629                 case WLAN_EID_CHALLENGE:
 630                         elems->challenge = pos;
 631                         elems->challenge_len = elen;
 632                         break;
 633                 case WLAN_EID_WPA:
 634                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 635                             pos[2] == 0xf2) {
 636                                 /* Microsoft OUI (00:50:F2) */
 637                                 if (pos[3] == 1) {
 638                                         /* OUI Type 1 - WPA IE */
 639                                         elems->wpa = pos;
 640                                         elems->wpa_len = elen;
 641                                 } else if (elen >= 5 && pos[3] == 2) {
 642                                         if (pos[4] == 0) {
 643                                                 elems->wmm_info = pos;
 644                                                 elems->wmm_info_len = elen;
 645                                         } else if (pos[4] == 1) {
 646                                                 elems->wmm_param = pos;
 647                                                 elems->wmm_param_len = elen;
 648                                         }
 649                                 }
 650                         }
 651                         break;
 652                 case WLAN_EID_RSN:
 653                         elems->rsn = pos;
 654                         elems->rsn_len = elen;
 655                         break;
 656                 case WLAN_EID_ERP_INFO:
 657                         elems->erp_info = pos;
 658                         elems->erp_info_len = elen;
 659                         break;
 660                 case WLAN_EID_EXT_SUPP_RATES:
 661                         elems->ext_supp_rates = pos;
 662                         elems->ext_supp_rates_len = elen;
 663                         break;
 664                 case WLAN_EID_HT_CAPABILITY:
 665                         if (elen >= sizeof(struct ieee80211_ht_cap))
 666                                 elems->ht_cap_elem = (void *)pos;
 667                         break;
 668                 case WLAN_EID_HT_INFORMATION:
 669                         if (elen >= sizeof(struct ieee80211_ht_info))
 670                                 elems->ht_info_elem = (void *)pos;
 671                         break;
 672                 case WLAN_EID_MESH_ID:
 673                         elems->mesh_id = pos;
 674                         elems->mesh_id_len = elen;
 675                         break;
 676                 case WLAN_EID_MESH_CONFIG:
 677                         elems->mesh_config = pos;
 678                         elems->mesh_config_len = elen;
 679                         break;
 680                 case WLAN_EID_PEER_LINK:
 681                         elems->peer_link = pos;
 682                         elems->peer_link_len = elen;
 683                         break;
 684                 case WLAN_EID_PREQ:
 685                         elems->preq = pos;
 686                         elems->preq_len = elen;
 687                         break;
 688                 case WLAN_EID_PREP:
 689                         elems->prep = pos;
 690                         elems->prep_len = elen;
 691                         break;
 692                 case WLAN_EID_PERR:
 693                         elems->perr = pos;
 694                         elems->perr_len = elen;
 695                         break;
 696                 case WLAN_EID_CHANNEL_SWITCH:
 697                         elems->ch_switch_elem = pos;
 698                         elems->ch_switch_elem_len = elen;
 699                         break;
 700                 case WLAN_EID_QUIET:
 701                         if (!elems->quiet_elem) {
 702                                 elems->quiet_elem = pos;
 703                                 elems->quiet_elem_len = elen;
 704                         }
 705                         elems->num_of_quiet_elem++;
 706                         break;
 707                 case WLAN_EID_COUNTRY:
 708                         elems->country_elem = pos;
 709                         elems->country_elem_len = elen;
 710                         break;
 711                 case WLAN_EID_PWR_CONSTRAINT:
 712                         elems->pwr_constr_elem = pos;
 713                         elems->pwr_constr_elem_len = elen;
 714                         break;
 715                 case WLAN_EID_TIMEOUT_INTERVAL:
 716                         elems->timeout_int = pos;
 717                         elems->timeout_int_len = elen;
 718                         break;
 719                 default:
 720                         break;
 721                 }
 722
 723                 left -= elen;
 724                 pos += elen;
 725         }
 726 }
 727
 728 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 729 {
 730         struct ieee80211_local *local = sdata->local;
 731         struct ieee80211_tx_queue_params qparam;
 732         int i;
 733
 734         if (!local->ops->conf_tx)
 735                 return;
 736
 737         memset(&qparam, 0, sizeof(qparam));
 738
 739         qparam.aifs = 2;
 740
 741         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 742             !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
 743                 qparam.cw_min = 31;
 744         else
 745                 qparam.cw_min = 15;
 746
 747         qparam.cw_max = 1023;
 748         qparam.txop = 0;
 749
 750         for (i = 0; i < local_to_hw(local)->queues; i++)
 751                 local->ops->conf_tx(local_to_hw(local), i, &qparam);
 752 }
 753
 754 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 755                                   const size_t supp_rates_len,
 756                                   const u8 *supp_rates)
 757 {
 758         struct ieee80211_local *local = sdata->local;
 759         int i, have_higher_than_11mbit = 0;
 760
 761         /* cf. IEEE 802.11 9.2.12 */
 762         for (i = 0; i < supp_rates_len; i++)
 763                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 764                         have_higher_than_11mbit = 1;
 765
 766         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 767             have_higher_than_11mbit)
 768                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 769         else
 770                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 771
 772         ieee80211_set_wmm_default(sdata);
 773 }
 774
 775 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 776                       int encrypt)
 777 {
 778         skb->dev = sdata->local->mdev;
 779         skb_set_mac_header(skb, 0);
 780         skb_set_network_header(skb, 0);
 781         skb_set_transport_header(skb, 0);
 782
 783         skb->iif = sdata->dev->ifindex;
 784         skb->do_not_encrypt = !encrypt;
 785
 786         dev_queue_xmit(skb);
 787 }
 788
 789 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
 790 {
 791         int ret = -EINVAL;
 792         struct ieee80211_channel *chan;
 793         struct ieee80211_local *local = sdata->local;
 794
 795         chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
 796
 797         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
 798                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 799                     chan->flags & IEEE80211_CHAN_NO_IBSS)
 800                         return ret;
 801                 local->oper_channel = chan;
 802                 local->oper_channel_type = NL80211_CHAN_NO_HT;
 803
 804                 if (local->sw_scanning || local->hw_scanning)
 805                         ret = 0;
 806                 else
 807                         ret = ieee80211_hw_config(
 808                                 local, IEEE80211_CONF_CHANGE_CHANNEL);
 809         }
 810
 811         return ret;
 812 }
 813
 814 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 815                               enum ieee80211_band band)
 816 {
 817         struct ieee80211_supported_band *sband;
 818         struct ieee80211_rate *bitrates;
 819         u32 mandatory_rates;
 820         enum ieee80211_rate_flags mandatory_flag;
 821         int i;
 822
 823         sband = local->hw.wiphy->bands[band];
 824         if (!sband) {
 825                 WARN_ON(1);
 826                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 827         }
 828
 829         if (band == IEEE80211_BAND_2GHZ)
 830                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 831         else
 832                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 833
 834         bitrates = sband->bitrates;
 835         mandatory_rates = 0;
 836         for (i = 0; i < sband->n_bitrates; i++)
 837                 if (bitrates[i].flags & mandatory_flag)
 838                         mandatory_rates |= BIT(i);
 839         return mandatory_rates;
 840 }
 841
 842 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 843                          u16 transaction, u16 auth_alg,
 844                          u8 *extra, size_t extra_len,
 845                          const u8 *bssid, int encrypt)
 846 {
 847         struct ieee80211_local *local = sdata->local;
 848         struct sk_buff *skb;
 849         struct ieee80211_mgmt *mgmt;
 850
 851         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 852                             sizeof(*mgmt) + 6 + extra_len);
 853         if (!skb) {
 854                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 855                        "frame\n", sdata->dev->name);
 856                 return;
 857         }
 858         skb_reserve(skb, local->hw.extra_tx_headroom);
 859
 860         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 861         memset(mgmt, 0, 24 + 6);
 862         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 863                                           IEEE80211_STYPE_AUTH);
 864         if (encrypt)
 865                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 866         memcpy(mgmt->da, bssid, ETH_ALEN);
 867         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 868         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 869         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 870         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 871         mgmt->u.auth.status_code = cpu_to_le16(0);
 872         if (extra)
 873                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 874
 875         ieee80211_tx_skb(sdata, skb, encrypt);
 876 }
 877
 878 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 879                               u8 *ssid, size_t ssid_len,
 880                               u8 *ie, size_t ie_len)
 881 {
 882         struct ieee80211_local *local = sdata->local;
 883         struct ieee80211_supported_band *sband;
 884         struct sk_buff *skb;
 885         struct ieee80211_mgmt *mgmt;
 886         u8 *pos, *supp_rates, *esupp_rates = NULL;
 887         int i;
 888
 889         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 890                             ie_len);
 891         if (!skb) {
 892                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 893                        "request\n", sdata->dev->name);
 894                 return;
 895         }
 896         skb_reserve(skb, local->hw.extra_tx_headroom);
 897
 898         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 899         memset(mgmt, 0, 24);
 900         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 901                                           IEEE80211_STYPE_PROBE_REQ);
 902         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 903         if (dst) {
 904                 memcpy(mgmt->da, dst, ETH_ALEN);
 905                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 906         } else {
 907                 memset(mgmt->da, 0xff, ETH_ALEN);
 908                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 909         }
 910         pos = skb_put(skb, 2 + ssid_len);
 911         *pos++ = WLAN_EID_SSID;
 912         *pos++ = ssid_len;
 913         memcpy(pos, ssid, ssid_len);
 914
 915         supp_rates = skb_put(skb, 2);
 916         supp_rates[0] = WLAN_EID_SUPP_RATES;
 917         supp_rates[1] = 0;
 918         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 919
 920         for (i = 0; i < sband->n_bitrates; i++) {
 921                 struct ieee80211_rate *rate = &sband->bitrates[i];
 922                 if (esupp_rates) {
 923                         pos = skb_put(skb, 1);
 924                         esupp_rates[1]++;
 925                 } else if (supp_rates[1] == 8) {
 926                         esupp_rates = skb_put(skb, 3);
 927                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 928                         esupp_rates[1] = 1;
 929                         pos = &esupp_rates[2];
 930                 } else {
 931                         pos = skb_put(skb, 1);
 932                         supp_rates[1]++;
 933                 }
 934                 *pos = rate->bitrate / 5;
 935         }
 936
 937         if (ie)
 938                 memcpy(skb_put(skb, ie_len), ie, ie_len);
 939
 940         ieee80211_tx_skb(sdata, skb, 0);
 941 }
 942
 943 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 944                             struct ieee802_11_elems *elems,
 945                             enum ieee80211_band band)
 946 {
 947         struct ieee80211_supported_band *sband;
 948         struct ieee80211_rate *bitrates;
 949         size_t num_rates;
 950         u32 supp_rates;
 951         int i, j;
 952         sband = local->hw.wiphy->bands[band];
 953
 954         if (!sband) {
 955                 WARN_ON(1);
 956                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 957         }
 958
 959         bitrates = sband->bitrates;
 960         num_rates = sband->n_bitrates;
 961         supp_rates = 0;
 962         for (i = 0; i < elems->supp_rates_len +
 963                      elems->ext_supp_rates_len; i++) {
 964                 u8 rate = 0;
 965                 int own_rate;
 966                 if (i < elems->supp_rates_len)
 967                         rate = elems->supp_rates[i];
 968                 else if (elems->ext_supp_rates)
 969                         rate = elems->ext_supp_rates
 970                                 [i - elems->supp_rates_len];
 971                 own_rate = 5 * (rate & 0x7f);
 972                 for (j = 0; j < num_rates; j++)
 973                         if (bitrates[j].bitrate == own_rate)
 974                                 supp_rates |= BIT(j);
 975         }
 976         return supp_rates;
 977 }