SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/util.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * utilities for mac80211
  12  */
  13
  14 #include <net/mac80211.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/bitmap.h>
  23 #include <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         if (queue >= hw->queues) {
 348                 if (local->ampdu_ac_queue[queue - hw->queues] < 0)
 349                         return;
 350
 351                 /*
 352                  * for virtual aggregation queues, we need to refcount the
 353                  * internal mac80211 disable (multiple times!), keep track of
 354                  * driver disable _and_ make sure the regular queue is
 355                  * actually enabled.
 356                  */
 357                 if (reason == IEEE80211_QUEUE_STOP_REASON_AGGREGATION)
 358                         local->amdpu_ac_stop_refcnt[queue - hw->queues]--;
 359                 else
 360                         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 361
 362                 if (local->queue_stop_reasons[queue] ||
 363                     local->amdpu_ac_stop_refcnt[queue - hw->queues])
 364                         return;
 365
 366                 /* now go on to treat the corresponding regular queue */
 367                 queue = local->ampdu_ac_queue[queue - hw->queues];
 368                 reason = IEEE80211_QUEUE_STOP_REASON_AGGREGATION;
 369         }
 370
 371         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 372
 373         if (local->queue_stop_reasons[queue] != 0)
 374                 /* someone still has this queue stopped */
 375                 return;
 376
 377         if (test_bit(queue, local->queues_pending)) {
 378                 set_bit(queue, local->queues_pending_run);
 379                 tasklet_schedule(&local->tx_pending_tasklet);
 380         } else {
 381                 netif_wake_subqueue(local->mdev, queue);
 382         }
 383 }
 384
 385 void ieee80211_wake_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_wake_queue(hw, queue, reason);
 393         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 394 }
 395
 396 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 397 {
 398         ieee80211_wake_queue_by_reason(hw, queue,
 399                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 400 }
 401 EXPORT_SYMBOL(ieee80211_wake_queue);
 402
 403 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 404                                    enum queue_stop_reason reason)
 405 {
 406         struct ieee80211_local *local = hw_to_local(hw);
 407
 408         if (queue >= hw->queues) {
 409                 if (local->ampdu_ac_queue[queue - hw->queues] < 0)
 410                         return;
 411
 412                 /*
 413                  * for virtual aggregation queues, we need to refcount the
 414                  * internal mac80211 disable (multiple times!), keep track of
 415                  * driver disable _and_ make sure the regular queue is
 416                  * actually enabled.
 417                  */
 418                 if (reason == IEEE80211_QUEUE_STOP_REASON_AGGREGATION)
 419                         local->amdpu_ac_stop_refcnt[queue - hw->queues]++;
 420                 else
 421                         __set_bit(reason, &local->queue_stop_reasons[queue]);
 422
 423                 /* now go on to treat the corresponding regular queue */
 424                 queue = local->ampdu_ac_queue[queue - hw->queues];
 425                 reason = IEEE80211_QUEUE_STOP_REASON_AGGREGATION;
 426         }
 427
 428         __set_bit(reason, &local->queue_stop_reasons[queue]);
 429
 430         netif_stop_subqueue(local->mdev, queue);
 431 }
 432
 433 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 434                                     enum queue_stop_reason reason)
 435 {
 436         struct ieee80211_local *local = hw_to_local(hw);
 437         unsigned long flags;
 438
 439         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 440         __ieee80211_stop_queue(hw, queue, reason);
 441         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 442 }
 443
 444 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 445 {
 446         ieee80211_stop_queue_by_reason(hw, queue,
 447                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 448 }
 449 EXPORT_SYMBOL(ieee80211_stop_queue);
 450
 451 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 452                                     enum queue_stop_reason reason)
 453 {
 454         struct ieee80211_local *local = hw_to_local(hw);
 455         unsigned long flags;
 456         int i;
 457
 458         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 459
 460         for (i = 0; i < hw->queues; i++)
 461                 __ieee80211_stop_queue(hw, i, reason);
 462
 463         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 464 }
 465
 466 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 467 {
 468         ieee80211_stop_queues_by_reason(hw,
 469                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 470 }
 471 EXPORT_SYMBOL(ieee80211_stop_queues);
 472
 473 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 474 {
 475         struct ieee80211_local *local = hw_to_local(hw);
 476         unsigned long flags;
 477
 478         if (queue >= hw->queues) {
 479                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 480                 queue = local->ampdu_ac_queue[queue - hw->queues];
 481                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 482                 if (queue < 0)
 483                         return true;
 484         }
 485
 486         return __netif_subqueue_stopped(local->mdev, queue);
 487 }
 488 EXPORT_SYMBOL(ieee80211_queue_stopped);
 489
 490 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 491                                      enum queue_stop_reason reason)
 492 {
 493         struct ieee80211_local *local = hw_to_local(hw);
 494         unsigned long flags;
 495         int i;
 496
 497         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 498
 499         for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
 500                 __ieee80211_wake_queue(hw, i, reason);
 501
 502         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 503 }
 504
 505 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 506 {
 507         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 508 }
 509 EXPORT_SYMBOL(ieee80211_wake_queues);
 510
 511 void ieee80211_iterate_active_interfaces(
 512         struct ieee80211_hw *hw,
 513         void (*iterator)(void *data, u8 *mac,
 514                          struct ieee80211_vif *vif),
 515         void *data)
 516 {
 517         struct ieee80211_local *local = hw_to_local(hw);
 518         struct ieee80211_sub_if_data *sdata;
 519
 520         mutex_lock(&local->iflist_mtx);
 521
 522         list_for_each_entry(sdata, &local->interfaces, list) {
 523                 switch (sdata->vif.type) {
 524                 case __NL80211_IFTYPE_AFTER_LAST:
 525                 case NL80211_IFTYPE_UNSPECIFIED:
 526                 case NL80211_IFTYPE_MONITOR:
 527                 case NL80211_IFTYPE_AP_VLAN:
 528                         continue;
 529                 case NL80211_IFTYPE_AP:
 530                 case NL80211_IFTYPE_STATION:
 531                 case NL80211_IFTYPE_ADHOC:
 532                 case NL80211_IFTYPE_WDS:
 533                 case NL80211_IFTYPE_MESH_POINT:
 534                         break;
 535                 }
 536                 if (netif_running(sdata->dev))
 537                         iterator(data, sdata->dev->dev_addr,
 538                                  &sdata->vif);
 539         }
 540
 541         mutex_unlock(&local->iflist_mtx);
 542 }
 543 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 544
 545 void ieee80211_iterate_active_interfaces_atomic(
 546         struct ieee80211_hw *hw,
 547         void (*iterator)(void *data, u8 *mac,
 548                          struct ieee80211_vif *vif),
 549         void *data)
 550 {
 551         struct ieee80211_local *local = hw_to_local(hw);
 552         struct ieee80211_sub_if_data *sdata;
 553
 554         rcu_read_lock();
 555
 556         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 557                 switch (sdata->vif.type) {
 558                 case __NL80211_IFTYPE_AFTER_LAST:
 559                 case NL80211_IFTYPE_UNSPECIFIED:
 560                 case NL80211_IFTYPE_MONITOR:
 561                 case NL80211_IFTYPE_AP_VLAN:
 562                         continue;
 563                 case NL80211_IFTYPE_AP:
 564                 case NL80211_IFTYPE_STATION:
 565                 case NL80211_IFTYPE_ADHOC:
 566                 case NL80211_IFTYPE_WDS:
 567                 case NL80211_IFTYPE_MESH_POINT:
 568                         break;
 569                 }
 570                 if (netif_running(sdata->dev))
 571                         iterator(data, sdata->dev->dev_addr,
 572                                  &sdata->vif);
 573         }
 574
 575         rcu_read_unlock();
 576 }
 577 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 578
 579 void ieee802_11_parse_elems(u8 *start, size_t len,
 580                             struct ieee802_11_elems *elems)
 581 {
 582         size_t left = len;
 583         u8 *pos = start;
 584
 585         memset(elems, 0, sizeof(*elems));
 586         elems->ie_start = start;
 587         elems->total_len = len;
 588
 589         while (left >= 2) {
 590                 u8 id, elen;
 591
 592                 id = *pos++;
 593                 elen = *pos++;
 594                 left -= 2;
 595
 596                 if (elen > left)
 597                         return;
 598
 599                 switch (id) {
 600                 case WLAN_EID_SSID:
 601                         elems->ssid = pos;
 602                         elems->ssid_len = elen;
 603                         break;
 604                 case WLAN_EID_SUPP_RATES:
 605                         elems->supp_rates = pos;
 606                         elems->supp_rates_len = elen;
 607                         break;
 608                 case WLAN_EID_FH_PARAMS:
 609                         elems->fh_params = pos;
 610                         elems->fh_params_len = elen;
 611                         break;
 612                 case WLAN_EID_DS_PARAMS:
 613                         elems->ds_params = pos;
 614                         elems->ds_params_len = elen;
 615                         break;
 616                 case WLAN_EID_CF_PARAMS:
 617                         elems->cf_params = pos;
 618                         elems->cf_params_len = elen;
 619                         break;
 620                 case WLAN_EID_TIM:
 621                         elems->tim = pos;
 622                         elems->tim_len = elen;
 623                         break;
 624                 case WLAN_EID_IBSS_PARAMS:
 625                         elems->ibss_params = pos;
 626                         elems->ibss_params_len = elen;
 627                         break;
 628                 case WLAN_EID_CHALLENGE:
 629                         elems->challenge = pos;
 630                         elems->challenge_len = elen;
 631                         break;
 632                 case WLAN_EID_WPA:
 633                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 634                             pos[2] == 0xf2) {
 635                                 /* Microsoft OUI (00:50:F2) */
 636                                 if (pos[3] == 1) {
 637                                         /* OUI Type 1 - WPA IE */
 638                                         elems->wpa = pos;
 639                                         elems->wpa_len = elen;
 640                                 } else if (elen >= 5 && pos[3] == 2) {
 641                                         if (pos[4] == 0) {
 642                                                 elems->wmm_info = pos;
 643                                                 elems->wmm_info_len = elen;
 644                                         } else if (pos[4] == 1) {
 645                                                 elems->wmm_param = pos;
 646                                                 elems->wmm_param_len = elen;
 647                                         }
 648                                 }
 649                         }
 650                         break;
 651                 case WLAN_EID_RSN:
 652                         elems->rsn = pos;
 653                         elems->rsn_len = elen;
 654                         break;
 655                 case WLAN_EID_ERP_INFO:
 656                         elems->erp_info = pos;
 657                         elems->erp_info_len = elen;
 658                         break;
 659                 case WLAN_EID_EXT_SUPP_RATES:
 660                         elems->ext_supp_rates = pos;
 661                         elems->ext_supp_rates_len = elen;
 662                         break;
 663                 case WLAN_EID_HT_CAPABILITY:
 664                         if (elen >= sizeof(struct ieee80211_ht_cap))
 665                                 elems->ht_cap_elem = (void *)pos;
 666                         break;
 667                 case WLAN_EID_HT_INFORMATION:
 668                         if (elen >= sizeof(struct ieee80211_ht_info))
 669                                 elems->ht_info_elem = (void *)pos;
 670                         break;
 671                 case WLAN_EID_MESH_ID:
 672                         elems->mesh_id = pos;
 673                         elems->mesh_id_len = elen;
 674                         break;
 675                 case WLAN_EID_MESH_CONFIG:
 676                         elems->mesh_config = pos;
 677                         elems->mesh_config_len = elen;
 678                         break;
 679                 case WLAN_EID_PEER_LINK:
 680                         elems->peer_link = pos;
 681                         elems->peer_link_len = elen;
 682                         break;
 683                 case WLAN_EID_PREQ:
 684                         elems->preq = pos;
 685                         elems->preq_len = elen;
 686                         break;
 687                 case WLAN_EID_PREP:
 688                         elems->prep = pos;
 689                         elems->prep_len = elen;
 690                         break;
 691                 case WLAN_EID_PERR:
 692                         elems->perr = pos;
 693                         elems->perr_len = elen;
 694                         break;
 695                 case WLAN_EID_CHANNEL_SWITCH:
 696                         elems->ch_switch_elem = pos;
 697                         elems->ch_switch_elem_len = elen;
 698                         break;
 699                 case WLAN_EID_QUIET:
 700                         if (!elems->quiet_elem) {
 701                                 elems->quiet_elem = pos;
 702                                 elems->quiet_elem_len = elen;
 703                         }
 704                         elems->num_of_quiet_elem++;
 705                         break;
 706                 case WLAN_EID_COUNTRY:
 707                         elems->country_elem = pos;
 708                         elems->country_elem_len = elen;
 709                         break;
 710                 case WLAN_EID_PWR_CONSTRAINT:
 711                         elems->pwr_constr_elem = pos;
 712                         elems->pwr_constr_elem_len = elen;
 713                         break;
 714                 case WLAN_EID_TIMEOUT_INTERVAL:
 715                         elems->timeout_int = pos;
 716                         elems->timeout_int_len = elen;
 717                         break;
 718                 default:
 719                         break;
 720                 }
 721
 722                 left -= elen;
 723                 pos += elen;
 724         }
 725 }
 726
 727 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 728 {
 729         struct ieee80211_local *local = sdata->local;
 730         struct ieee80211_tx_queue_params qparam;
 731         int i;
 732
 733         if (!local->ops->conf_tx)
 734                 return;
 735
 736         memset(&qparam, 0, sizeof(qparam));
 737
 738         qparam.aifs = 2;
 739
 740         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 741             !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
 742                 qparam.cw_min = 31;
 743         else
 744                 qparam.cw_min = 15;
 745
 746         qparam.cw_max = 1023;
 747         qparam.txop = 0;
 748
 749         for (i = 0; i < local_to_hw(local)->queues; i++)
 750                 local->ops->conf_tx(local_to_hw(local), i, &qparam);
 751 }
 752
 753 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 754                                   const size_t supp_rates_len,
 755                                   const u8 *supp_rates)
 756 {
 757         struct ieee80211_local *local = sdata->local;
 758         int i, have_higher_than_11mbit = 0;
 759
 760         /* cf. IEEE 802.11 9.2.12 */
 761         for (i = 0; i < supp_rates_len; i++)
 762                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 763                         have_higher_than_11mbit = 1;
 764
 765         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 766             have_higher_than_11mbit)
 767                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 768         else
 769                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 770
 771         ieee80211_set_wmm_default(sdata);
 772 }
 773
 774 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 775                       int encrypt)
 776 {
 777         skb->dev = sdata->local->mdev;
 778         skb_set_mac_header(skb, 0);
 779         skb_set_network_header(skb, 0);
 780         skb_set_transport_header(skb, 0);
 781
 782         skb->iif = sdata->dev->ifindex;
 783         skb->do_not_encrypt = !encrypt;
 784
 785         dev_queue_xmit(skb);
 786 }
 787
 788 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
 789 {
 790         int ret = -EINVAL;
 791         struct ieee80211_channel *chan;
 792         struct ieee80211_local *local = sdata->local;
 793
 794         chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
 795
 796         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
 797                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 798                     chan->flags & IEEE80211_CHAN_NO_IBSS)
 799                         return ret;
 800                 local->oper_channel = chan;
 801                 local->oper_channel_type = NL80211_CHAN_NO_HT;
 802
 803                 if (local->sw_scanning || local->hw_scanning)
 804                         ret = 0;
 805                 else
 806                         ret = ieee80211_hw_config(
 807                                 local, IEEE80211_CONF_CHANGE_CHANNEL);
 808         }
 809
 810         return ret;
 811 }
 812
 813 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 814                               enum ieee80211_band band)
 815 {
 816         struct ieee80211_supported_band *sband;
 817         struct ieee80211_rate *bitrates;
 818         u32 mandatory_rates;
 819         enum ieee80211_rate_flags mandatory_flag;
 820         int i;
 821
 822         sband = local->hw.wiphy->bands[band];
 823         if (!sband) {
 824                 WARN_ON(1);
 825                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 826         }
 827
 828         if (band == IEEE80211_BAND_2GHZ)
 829                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 830         else
 831                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 832
 833         bitrates = sband->bitrates;
 834         mandatory_rates = 0;
 835         for (i = 0; i < sband->n_bitrates; i++)
 836                 if (bitrates[i].flags & mandatory_flag)
 837                         mandatory_rates |= BIT(i);
 838         return mandatory_rates;
 839 }
 840
 841 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 842                          u16 transaction, u16 auth_alg,
 843                          u8 *extra, size_t extra_len,
 844                          const u8 *bssid, int encrypt)
 845 {
 846         struct ieee80211_local *local = sdata->local;
 847         struct sk_buff *skb;
 848         struct ieee80211_mgmt *mgmt;
 849
 850         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 851                             sizeof(*mgmt) + 6 + extra_len);
 852         if (!skb) {
 853                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 854                        "frame\n", sdata->dev->name);
 855                 return;
 856         }
 857         skb_reserve(skb, local->hw.extra_tx_headroom);
 858
 859         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 860         memset(mgmt, 0, 24 + 6);
 861         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 862                                           IEEE80211_STYPE_AUTH);
 863         if (encrypt)
 864                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 865         memcpy(mgmt->da, bssid, ETH_ALEN);
 866         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 867         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 868         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 869         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 870         mgmt->u.auth.status_code = cpu_to_le16(0);
 871         if (extra)
 872                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 873
 874         ieee80211_tx_skb(sdata, skb, encrypt);
 875 }
 876
 877 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 878                               u8 *ssid, size_t ssid_len,
 879                               u8 *ie, size_t ie_len)
 880 {
 881         struct ieee80211_local *local = sdata->local;
 882         struct ieee80211_supported_band *sband;
 883         struct sk_buff *skb;
 884         struct ieee80211_mgmt *mgmt;
 885         u8 *pos, *supp_rates, *esupp_rates = NULL;
 886         int i;
 887
 888         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 889                             ie_len);
 890         if (!skb) {
 891                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 892                        "request\n", sdata->dev->name);
 893                 return;
 894         }
 895         skb_reserve(skb, local->hw.extra_tx_headroom);
 896
 897         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 898         memset(mgmt, 0, 24);
 899         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 900                                           IEEE80211_STYPE_PROBE_REQ);
 901         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 902         if (dst) {
 903                 memcpy(mgmt->da, dst, ETH_ALEN);
 904                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 905         } else {
 906                 memset(mgmt->da, 0xff, ETH_ALEN);
 907                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 908         }
 909         pos = skb_put(skb, 2 + ssid_len);
 910         *pos++ = WLAN_EID_SSID;
 911         *pos++ = ssid_len;
 912         memcpy(pos, ssid, ssid_len);
 913
 914         supp_rates = skb_put(skb, 2);
 915         supp_rates[0] = WLAN_EID_SUPP_RATES;
 916         supp_rates[1] = 0;
 917         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 918
 919         for (i = 0; i < sband->n_bitrates; i++) {
 920                 struct ieee80211_rate *rate = &sband->bitrates[i];
 921                 if (esupp_rates) {
 922                         pos = skb_put(skb, 1);
 923                         esupp_rates[1]++;
 924                 } else if (supp_rates[1] == 8) {
 925                         esupp_rates = skb_put(skb, 3);
 926                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 927                         esupp_rates[1] = 1;
 928                         pos = &esupp_rates[2];
 929                 } else {
 930                         pos = skb_put(skb, 1);
 931                         supp_rates[1]++;
 932                 }
 933                 *pos = rate->bitrate / 5;
 934         }
 935
 936         if (ie)
 937                 memcpy(skb_put(skb, ie_len), ie, ie_len);
 938
 939         ieee80211_tx_skb(sdata, skb, 0);
 940 }
 941
 942 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 943                             struct ieee802_11_elems *elems,
 944                             enum ieee80211_band band)
 945 {
 946         struct ieee80211_supported_band *sband;
 947         struct ieee80211_rate *bitrates;
 948         size_t num_rates;
 949         u32 supp_rates;
 950         int i, j;
 951         sband = local->hw.wiphy->bands[band];
 952
 953         if (!sband) {
 954                 WARN_ON(1);
 955                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 956         }
 957
 958         bitrates = sband->bitrates;
 959         num_rates = sband->n_bitrates;
 960         supp_rates = 0;
 961         for (i = 0; i < elems->supp_rates_len +
 962                      elems->ext_supp_rates_len; i++) {
 963                 u8 rate = 0;
 964                 int own_rate;
 965                 if (i < elems->supp_rates_len)
 966                         rate = elems->supp_rates[i];
 967                 else if (elems->ext_supp_rates)
 968                         rate = elems->ext_supp_rates
 969                                 [i - elems->supp_rates_len];
 970                 own_rate = 5 * (rate & 0x7f);
 971                 for (j = 0; j < num_rates; j++)
 972                         if (bitrates[j].bitrate == own_rate)
 973                                 supp_rates |= BIT(j);
 974         }
 975         return supp_rates;
 976 }