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 #include "led.h"
  32
  33 /* privid for wiphys to determine whether they belong to us or not */
  34 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  35
  36 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
  37 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  38 const unsigned char rfc1042_header[] __aligned(2) =
  39         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  40
  41 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  42 const unsigned char bridge_tunnel_header[] __aligned(2) =
  43         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  44
  45 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  46 {
  47         struct ieee80211_local *local;
  48         BUG_ON(!wiphy);
  49
  50         local = wiphy_priv(wiphy);
  51         return &local->hw;
  52 }
  53 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  54
  55 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  56                         enum nl80211_iftype type)
  57 {
  58         __le16 fc = hdr->frame_control;
  59
  60          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  61         if (len < 16)
  62                 return NULL;
  63
  64         if (ieee80211_is_data(fc)) {
  65                 if (len < 24) /* drop incorrect hdr len (data) */
  66                         return NULL;
  67
  68                 if (ieee80211_has_a4(fc))
  69                         return NULL;
  70                 if (ieee80211_has_tods(fc))
  71                         return hdr->addr1;
  72                 if (ieee80211_has_fromds(fc))
  73                         return hdr->addr2;
  74
  75                 return hdr->addr3;
  76         }
  77
  78         if (ieee80211_is_mgmt(fc)) {
  79                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  80                         return NULL;
  81                 return hdr->addr3;
  82         }
  83
  84         if (ieee80211_is_ctl(fc)) {
  85                 if(ieee80211_is_pspoll(fc))
  86                         return hdr->addr1;
  87
  88                 if (ieee80211_is_back_req(fc)) {
  89                         switch (type) {
  90                         case NL80211_IFTYPE_STATION:
  91                                 return hdr->addr2;
  92                         case NL80211_IFTYPE_AP:
  93                         case NL80211_IFTYPE_AP_VLAN:
  94                                 return hdr->addr1;
  95                         default:
  96                                 break; /* fall through to the return */
  97                         }
  98                 }
  99         }
 100
 101         return NULL;
 102 }
 103
 104 unsigned int ieee80211_hdrlen(__le16 fc)
 105 {
 106         unsigned int hdrlen = 24;
 107
 108         if (ieee80211_is_data(fc)) {
 109                 if (ieee80211_has_a4(fc))
 110                         hdrlen = 30;
 111                 if (ieee80211_is_data_qos(fc))
 112                         hdrlen += IEEE80211_QOS_CTL_LEN;
 113                 goto out;
 114         }
 115
 116         if (ieee80211_is_ctl(fc)) {
 117                 /*
 118                  * ACK and CTS are 10 bytes, all others 16. To see how
 119                  * to get this condition consider
 120                  *   subtype mask:   0b0000000011110000 (0x00F0)
 121                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 122                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 123                  *   bits that matter:         ^^^      (0x00E0)
 124                  *   value of those: 0b0000000011000000 (0x00C0)
 125                  */
 126                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 127                         hdrlen = 10;
 128                 else
 129                         hdrlen = 16;
 130         }
 131 out:
 132         return hdrlen;
 133 }
 134 EXPORT_SYMBOL(ieee80211_hdrlen);
 135
 136 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 137 {
 138         const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
 139         unsigned int hdrlen;
 140
 141         if (unlikely(skb->len < 10))
 142                 return 0;
 143         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 144         if (unlikely(hdrlen > skb->len))
 145                 return 0;
 146         return hdrlen;
 147 }
 148 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 149
 150 int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 151 {
 152         int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
 153         /* 7.1.3.5a.2 */
 154         switch (ae) {
 155         case 0:
 156                 return 6;
 157         case 1:
 158                 return 12;
 159         case 2:
 160                 return 18;
 161         case 3:
 162                 return 24;
 163         default:
 164                 return 6;
 165         }
 166 }
 167
 168 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
 169 {
 170         struct sk_buff *skb = tx->skb;
 171         struct ieee80211_hdr *hdr;
 172
 173         do {
 174                 hdr = (struct ieee80211_hdr *) skb->data;
 175                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 176         } while ((skb = skb->next));
 177 }
 178
 179 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 180                              int rate, int erp, int short_preamble)
 181 {
 182         int dur;
 183
 184         /* calculate duration (in microseconds, rounded up to next higher
 185          * integer if it includes a fractional microsecond) to send frame of
 186          * len bytes (does not include FCS) at the given rate. Duration will
 187          * also include SIFS.
 188          *
 189          * rate is in 100 kbps, so divident is multiplied by 10 in the
 190          * DIV_ROUND_UP() operations.
 191          */
 192
 193         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 194                 /*
 195                  * OFDM:
 196                  *
 197                  * N_DBPS = DATARATE x 4
 198                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 199                  *      (16 = SIGNAL time, 6 = tail bits)
 200                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 201                  *
 202                  * T_SYM = 4 usec
 203                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 204                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 205                  *      signal ext = 6 usec
 206                  */
 207                 dur = 16; /* SIFS + signal ext */
 208                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 209                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 210                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 211                                         4 * rate); /* T_SYM x N_SYM */
 212         } else {
 213                 /*
 214                  * 802.11b or 802.11g with 802.11b compatibility:
 215                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 216                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 217                  *
 218                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 219                  * aSIFSTime = 10 usec
 220                  * aPreambleLength = 144 usec or 72 usec with short preamble
 221                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 222                  */
 223                 dur = 10; /* aSIFSTime = 10 usec */
 224                 dur += short_preamble ? (72 + 24) : (144 + 48);
 225
 226                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 227         }
 228
 229         return dur;
 230 }
 231
 232 /* Exported duration function for driver use */
 233 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 234                                         struct ieee80211_vif *vif,
 235                                         size_t frame_len,
 236                                         struct ieee80211_rate *rate)
 237 {
 238         struct ieee80211_local *local = hw_to_local(hw);
 239         struct ieee80211_sub_if_data *sdata;
 240         u16 dur;
 241         int erp;
 242         bool short_preamble = false;
 243
 244         erp = 0;
 245         if (vif) {
 246                 sdata = vif_to_sdata(vif);
 247                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 248                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 249                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 250         }
 251
 252         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 253                                        short_preamble);
 254
 255         return cpu_to_le16(dur);
 256 }
 257 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 258
 259 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 260                               struct ieee80211_vif *vif, size_t frame_len,
 261                               const struct ieee80211_tx_info *frame_txctl)
 262 {
 263         struct ieee80211_local *local = hw_to_local(hw);
 264         struct ieee80211_rate *rate;
 265         struct ieee80211_sub_if_data *sdata;
 266         bool short_preamble;
 267         int erp;
 268         u16 dur;
 269         struct ieee80211_supported_band *sband;
 270
 271         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 272
 273         short_preamble = false;
 274
 275         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 276
 277         erp = 0;
 278         if (vif) {
 279                 sdata = vif_to_sdata(vif);
 280                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 281                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 282                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 283         }
 284
 285         /* CTS duration */
 286         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 287                                        erp, short_preamble);
 288         /* Data frame duration */
 289         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 290                                         erp, short_preamble);
 291         /* ACK duration */
 292         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 293                                         erp, short_preamble);
 294
 295         return cpu_to_le16(dur);
 296 }
 297 EXPORT_SYMBOL(ieee80211_rts_duration);
 298
 299 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 300                                     struct ieee80211_vif *vif,
 301                                     size_t frame_len,
 302                                     const struct ieee80211_tx_info *frame_txctl)
 303 {
 304         struct ieee80211_local *local = hw_to_local(hw);
 305         struct ieee80211_rate *rate;
 306         struct ieee80211_sub_if_data *sdata;
 307         bool short_preamble;
 308         int erp;
 309         u16 dur;
 310         struct ieee80211_supported_band *sband;
 311
 312         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 313
 314         short_preamble = false;
 315
 316         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 317         erp = 0;
 318         if (vif) {
 319                 sdata = vif_to_sdata(vif);
 320                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 321                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 322                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 323         }
 324
 325         /* Data frame duration */
 326         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 327                                        erp, short_preamble);
 328         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 329                 /* ACK duration */
 330                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 331                                                 erp, short_preamble);
 332         }
 333
 334         return cpu_to_le16(dur);
 335 }
 336 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 337
 338 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 339                                    enum queue_stop_reason reason)
 340 {
 341         struct ieee80211_local *local = hw_to_local(hw);
 342
 343         if (WARN_ON(queue >= hw->queues))
 344                 return;
 345
 346         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 347
 348         if (!skb_queue_empty(&local->pending[queue]) &&
 349             local->queue_stop_reasons[queue] ==
 350                                 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
 351                 tasklet_schedule(&local->tx_pending_tasklet);
 352
 353         if (local->queue_stop_reasons[queue] != 0)
 354                 /* someone still has this queue stopped */
 355                 return;
 356
 357         netif_wake_subqueue(local->mdev, queue);
 358 }
 359
 360 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 361                                     enum queue_stop_reason reason)
 362 {
 363         struct ieee80211_local *local = hw_to_local(hw);
 364         unsigned long flags;
 365
 366         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 367         __ieee80211_wake_queue(hw, queue, reason);
 368         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 369 }
 370
 371 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 372 {
 373         ieee80211_wake_queue_by_reason(hw, queue,
 374                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 375 }
 376 EXPORT_SYMBOL(ieee80211_wake_queue);
 377
 378 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 379                                    enum queue_stop_reason reason)
 380 {
 381         struct ieee80211_local *local = hw_to_local(hw);
 382
 383         if (WARN_ON(queue >= hw->queues))
 384                 return;
 385
 386         /*
 387          * Only stop if it was previously running, this is necessary
 388          * for correct pending packets handling because there we may
 389          * start (but not wake) the queue and rely on that.
 390          */
 391         if (!local->queue_stop_reasons[queue])
 392                 netif_stop_subqueue(local->mdev, queue);
 393
 394         __set_bit(reason, &local->queue_stop_reasons[queue]);
 395 }
 396
 397 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 398                                     enum queue_stop_reason reason)
 399 {
 400         struct ieee80211_local *local = hw_to_local(hw);
 401         unsigned long flags;
 402
 403         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 404         __ieee80211_stop_queue(hw, queue, reason);
 405         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 406 }
 407
 408 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 409 {
 410         ieee80211_stop_queue_by_reason(hw, queue,
 411                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 412 }
 413 EXPORT_SYMBOL(ieee80211_stop_queue);
 414
 415 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 416                                     enum queue_stop_reason reason)
 417 {
 418         struct ieee80211_local *local = hw_to_local(hw);
 419         unsigned long flags;
 420         int i;
 421
 422         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 423
 424         for (i = 0; i < hw->queues; i++)
 425                 __ieee80211_stop_queue(hw, i, reason);
 426
 427         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 428 }
 429
 430 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 431 {
 432         ieee80211_stop_queues_by_reason(hw,
 433                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 434 }
 435 EXPORT_SYMBOL(ieee80211_stop_queues);
 436
 437 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 438 {
 439         struct ieee80211_local *local = hw_to_local(hw);
 440
 441         if (WARN_ON(queue >= hw->queues))
 442                 return true;
 443
 444         return __netif_subqueue_stopped(local->mdev, queue);
 445 }
 446 EXPORT_SYMBOL(ieee80211_queue_stopped);
 447
 448 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 449                                      enum queue_stop_reason reason)
 450 {
 451         struct ieee80211_local *local = hw_to_local(hw);
 452         unsigned long flags;
 453         int i;
 454
 455         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 456
 457         for (i = 0; i < hw->queues; i++)
 458                 __ieee80211_wake_queue(hw, i, reason);
 459
 460         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 461 }
 462
 463 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 464 {
 465         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 466 }
 467 EXPORT_SYMBOL(ieee80211_wake_queues);
 468
 469 void ieee80211_iterate_active_interfaces(
 470         struct ieee80211_hw *hw,
 471         void (*iterator)(void *data, u8 *mac,
 472                          struct ieee80211_vif *vif),
 473         void *data)
 474 {
 475         struct ieee80211_local *local = hw_to_local(hw);
 476         struct ieee80211_sub_if_data *sdata;
 477
 478         mutex_lock(&local->iflist_mtx);
 479
 480         list_for_each_entry(sdata, &local->interfaces, list) {
 481                 switch (sdata->vif.type) {
 482                 case __NL80211_IFTYPE_AFTER_LAST:
 483                 case NL80211_IFTYPE_UNSPECIFIED:
 484                 case NL80211_IFTYPE_MONITOR:
 485                 case NL80211_IFTYPE_AP_VLAN:
 486                         continue;
 487                 case NL80211_IFTYPE_AP:
 488                 case NL80211_IFTYPE_STATION:
 489                 case NL80211_IFTYPE_ADHOC:
 490                 case NL80211_IFTYPE_WDS:
 491                 case NL80211_IFTYPE_MESH_POINT:
 492                         break;
 493                 }
 494                 if (netif_running(sdata->dev))
 495                         iterator(data, sdata->dev->dev_addr,
 496                                  &sdata->vif);
 497         }
 498
 499         mutex_unlock(&local->iflist_mtx);
 500 }
 501 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 502
 503 void ieee80211_iterate_active_interfaces_atomic(
 504         struct ieee80211_hw *hw,
 505         void (*iterator)(void *data, u8 *mac,
 506                          struct ieee80211_vif *vif),
 507         void *data)
 508 {
 509         struct ieee80211_local *local = hw_to_local(hw);
 510         struct ieee80211_sub_if_data *sdata;
 511
 512         rcu_read_lock();
 513
 514         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 515                 switch (sdata->vif.type) {
 516                 case __NL80211_IFTYPE_AFTER_LAST:
 517                 case NL80211_IFTYPE_UNSPECIFIED:
 518                 case NL80211_IFTYPE_MONITOR:
 519                 case NL80211_IFTYPE_AP_VLAN:
 520                         continue;
 521                 case NL80211_IFTYPE_AP:
 522                 case NL80211_IFTYPE_STATION:
 523                 case NL80211_IFTYPE_ADHOC:
 524                 case NL80211_IFTYPE_WDS:
 525                 case NL80211_IFTYPE_MESH_POINT:
 526                         break;
 527                 }
 528                 if (netif_running(sdata->dev))
 529                         iterator(data, sdata->dev->dev_addr,
 530                                  &sdata->vif);
 531         }
 532
 533         rcu_read_unlock();
 534 }
 535 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 536
 537 void ieee802_11_parse_elems(u8 *start, size_t len,
 538                             struct ieee802_11_elems *elems)
 539 {
 540         size_t left = len;
 541         u8 *pos = start;
 542
 543         memset(elems, 0, sizeof(*elems));
 544         elems->ie_start = start;
 545         elems->total_len = len;
 546
 547         while (left >= 2) {
 548                 u8 id, elen;
 549
 550                 id = *pos++;
 551                 elen = *pos++;
 552                 left -= 2;
 553
 554                 if (elen > left)
 555                         return;
 556
 557                 switch (id) {
 558                 case WLAN_EID_SSID:
 559                         elems->ssid = pos;
 560                         elems->ssid_len = elen;
 561                         break;
 562                 case WLAN_EID_SUPP_RATES:
 563                         elems->supp_rates = pos;
 564                         elems->supp_rates_len = elen;
 565                         break;
 566                 case WLAN_EID_FH_PARAMS:
 567                         elems->fh_params = pos;
 568                         elems->fh_params_len = elen;
 569                         break;
 570                 case WLAN_EID_DS_PARAMS:
 571                         elems->ds_params = pos;
 572                         elems->ds_params_len = elen;
 573                         break;
 574                 case WLAN_EID_CF_PARAMS:
 575                         elems->cf_params = pos;
 576                         elems->cf_params_len = elen;
 577                         break;
 578                 case WLAN_EID_TIM:
 579                         elems->tim = pos;
 580                         elems->tim_len = elen;
 581                         break;
 582                 case WLAN_EID_IBSS_PARAMS:
 583                         elems->ibss_params = pos;
 584                         elems->ibss_params_len = elen;
 585                         break;
 586                 case WLAN_EID_CHALLENGE:
 587                         elems->challenge = pos;
 588                         elems->challenge_len = elen;
 589                         break;
 590                 case WLAN_EID_WPA:
 591                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 592                             pos[2] == 0xf2) {
 593                                 /* Microsoft OUI (00:50:F2) */
 594                                 if (pos[3] == 1) {
 595                                         /* OUI Type 1 - WPA IE */
 596                                         elems->wpa = pos;
 597                                         elems->wpa_len = elen;
 598                                 } else if (elen >= 5 && pos[3] == 2) {
 599                                         if (pos[4] == 0) {
 600                                                 elems->wmm_info = pos;
 601                                                 elems->wmm_info_len = elen;
 602                                         } else if (pos[4] == 1) {
 603                                                 elems->wmm_param = pos;
 604                                                 elems->wmm_param_len = elen;
 605                                         }
 606                                 }
 607                         }
 608                         break;
 609                 case WLAN_EID_RSN:
 610                         elems->rsn = pos;
 611                         elems->rsn_len = elen;
 612                         break;
 613                 case WLAN_EID_ERP_INFO:
 614                         elems->erp_info = pos;
 615                         elems->erp_info_len = elen;
 616                         break;
 617                 case WLAN_EID_EXT_SUPP_RATES:
 618                         elems->ext_supp_rates = pos;
 619                         elems->ext_supp_rates_len = elen;
 620                         break;
 621                 case WLAN_EID_HT_CAPABILITY:
 622                         if (elen >= sizeof(struct ieee80211_ht_cap))
 623                                 elems->ht_cap_elem = (void *)pos;
 624                         break;
 625                 case WLAN_EID_HT_INFORMATION:
 626                         if (elen >= sizeof(struct ieee80211_ht_info))
 627                                 elems->ht_info_elem = (void *)pos;
 628                         break;
 629                 case WLAN_EID_MESH_ID:
 630                         elems->mesh_id = pos;
 631                         elems->mesh_id_len = elen;
 632                         break;
 633                 case WLAN_EID_MESH_CONFIG:
 634                         elems->mesh_config = pos;
 635                         elems->mesh_config_len = elen;
 636                         break;
 637                 case WLAN_EID_PEER_LINK:
 638                         elems->peer_link = pos;
 639                         elems->peer_link_len = elen;
 640                         break;
 641                 case WLAN_EID_PREQ:
 642                         elems->preq = pos;
 643                         elems->preq_len = elen;
 644                         break;
 645                 case WLAN_EID_PREP:
 646                         elems->prep = pos;
 647                         elems->prep_len = elen;
 648                         break;
 649                 case WLAN_EID_PERR:
 650                         elems->perr = pos;
 651                         elems->perr_len = elen;
 652                         break;
 653                 case WLAN_EID_CHANNEL_SWITCH:
 654                         elems->ch_switch_elem = pos;
 655                         elems->ch_switch_elem_len = elen;
 656                         break;
 657                 case WLAN_EID_QUIET:
 658                         if (!elems->quiet_elem) {
 659                                 elems->quiet_elem = pos;
 660                                 elems->quiet_elem_len = elen;
 661                         }
 662                         elems->num_of_quiet_elem++;
 663                         break;
 664                 case WLAN_EID_COUNTRY:
 665                         elems->country_elem = pos;
 666                         elems->country_elem_len = elen;
 667                         break;
 668                 case WLAN_EID_PWR_CONSTRAINT:
 669                         elems->pwr_constr_elem = pos;
 670                         elems->pwr_constr_elem_len = elen;
 671                         break;
 672                 case WLAN_EID_TIMEOUT_INTERVAL:
 673                         elems->timeout_int = pos;
 674                         elems->timeout_int_len = elen;
 675                         break;
 676                 default:
 677                         break;
 678                 }
 679
 680                 left -= elen;
 681                 pos += elen;
 682         }
 683 }
 684
 685 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 686 {
 687         struct ieee80211_local *local = sdata->local;
 688         struct ieee80211_tx_queue_params qparam;
 689         int i;
 690
 691         if (!local->ops->conf_tx)
 692                 return;
 693
 694         memset(&qparam, 0, sizeof(qparam));
 695
 696         qparam.aifs = 2;
 697
 698         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 699             !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
 700                 qparam.cw_min = 31;
 701         else
 702                 qparam.cw_min = 15;
 703
 704         qparam.cw_max = 1023;
 705         qparam.txop = 0;
 706
 707         for (i = 0; i < local_to_hw(local)->queues; i++)
 708                 local->ops->conf_tx(local_to_hw(local), i, &qparam);
 709 }
 710
 711 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 712                                   const size_t supp_rates_len,
 713                                   const u8 *supp_rates)
 714 {
 715         struct ieee80211_local *local = sdata->local;
 716         int i, have_higher_than_11mbit = 0;
 717
 718         /* cf. IEEE 802.11 9.2.12 */
 719         for (i = 0; i < supp_rates_len; i++)
 720                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 721                         have_higher_than_11mbit = 1;
 722
 723         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 724             have_higher_than_11mbit)
 725                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 726         else
 727                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 728
 729         ieee80211_set_wmm_default(sdata);
 730 }
 731
 732 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 733                       int encrypt)
 734 {
 735         skb->dev = sdata->local->mdev;
 736         skb_set_mac_header(skb, 0);
 737         skb_set_network_header(skb, 0);
 738         skb_set_transport_header(skb, 0);
 739
 740         skb->iif = sdata->dev->ifindex;
 741         skb->do_not_encrypt = !encrypt;
 742
 743         dev_queue_xmit(skb);
 744 }
 745
 746 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
 747 {
 748         int ret = -EINVAL;
 749         struct ieee80211_channel *chan;
 750         struct ieee80211_local *local = sdata->local;
 751
 752         chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
 753
 754         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
 755                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 756                     chan->flags & IEEE80211_CHAN_NO_IBSS)
 757                         return ret;
 758                 local->oper_channel = chan;
 759                 local->oper_channel_type = NL80211_CHAN_NO_HT;
 760
 761                 if (local->sw_scanning || local->hw_scanning)
 762                         ret = 0;
 763                 else
 764                         ret = ieee80211_hw_config(
 765                                 local, IEEE80211_CONF_CHANGE_CHANNEL);
 766         }
 767
 768         return ret;
 769 }
 770
 771 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 772                               enum ieee80211_band band)
 773 {
 774         struct ieee80211_supported_band *sband;
 775         struct ieee80211_rate *bitrates;
 776         u32 mandatory_rates;
 777         enum ieee80211_rate_flags mandatory_flag;
 778         int i;
 779
 780         sband = local->hw.wiphy->bands[band];
 781         if (!sband) {
 782                 WARN_ON(1);
 783                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 784         }
 785
 786         if (band == IEEE80211_BAND_2GHZ)
 787                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 788         else
 789                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 790
 791         bitrates = sband->bitrates;
 792         mandatory_rates = 0;
 793         for (i = 0; i < sband->n_bitrates; i++)
 794                 if (bitrates[i].flags & mandatory_flag)
 795                         mandatory_rates |= BIT(i);
 796         return mandatory_rates;
 797 }
 798
 799 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 800                          u16 transaction, u16 auth_alg,
 801                          u8 *extra, size_t extra_len,
 802                          const u8 *bssid, int encrypt)
 803 {
 804         struct ieee80211_local *local = sdata->local;
 805         struct sk_buff *skb;
 806         struct ieee80211_mgmt *mgmt;
 807
 808         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 809                             sizeof(*mgmt) + 6 + extra_len);
 810         if (!skb) {
 811                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 812                        "frame\n", sdata->dev->name);
 813                 return;
 814         }
 815         skb_reserve(skb, local->hw.extra_tx_headroom);
 816
 817         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 818         memset(mgmt, 0, 24 + 6);
 819         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 820                                           IEEE80211_STYPE_AUTH);
 821         if (encrypt)
 822                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 823         memcpy(mgmt->da, bssid, ETH_ALEN);
 824         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 825         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 826         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 827         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 828         mgmt->u.auth.status_code = cpu_to_le16(0);
 829         if (extra)
 830                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 831
 832         ieee80211_tx_skb(sdata, skb, encrypt);
 833 }
 834
 835 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 836                              const u8 *ie, size_t ie_len)
 837 {
 838         struct ieee80211_supported_band *sband;
 839         u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
 840         int i;
 841
 842         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 843
 844         pos = buffer;
 845
 846         *pos++ = WLAN_EID_SUPP_RATES;
 847         supp_rates_len = pos;
 848         *pos++ = 0;
 849
 850         for (i = 0; i < sband->n_bitrates; i++) {
 851                 struct ieee80211_rate *rate = &sband->bitrates[i];
 852
 853                 if (esupp_rates_len) {
 854                         *esupp_rates_len += 1;
 855                 } else if (*supp_rates_len == 8) {
 856                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
 857                         esupp_rates_len = pos;
 858                         *pos++ = 1;
 859                 } else
 860                         *supp_rates_len += 1;
 861
 862                 *pos++ = rate->bitrate / 5;
 863         }
 864
 865         if (sband->ht_cap.ht_supported) {
 866                 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
 867
 868                 *pos++ = WLAN_EID_HT_CAPABILITY;
 869                 *pos++ = sizeof(struct ieee80211_ht_cap);
 870                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 871                 memcpy(pos, &tmp, sizeof(u16));
 872                 pos += sizeof(u16);
 873                 /* TODO: needs a define here for << 2 */
 874                 *pos++ = sband->ht_cap.ampdu_factor |
 875                          (sband->ht_cap.ampdu_density << 2);
 876                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 877                 pos += sizeof(sband->ht_cap.mcs);
 878                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 879         }
 880
 881         /*
 882          * If adding more here, adjust code in main.c
 883          * that calculates local->scan_ies_len.
 884          */
 885
 886         if (ie) {
 887                 memcpy(pos, ie, ie_len);
 888                 pos += ie_len;
 889         }
 890
 891         return pos - buffer;
 892 }
 893
 894 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 895                               const u8 *ssid, size_t ssid_len,
 896                               const u8 *ie, size_t ie_len)
 897 {
 898         struct ieee80211_local *local = sdata->local;
 899         struct sk_buff *skb;
 900         struct ieee80211_mgmt *mgmt;
 901         u8 *pos;
 902
 903         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 904                             ie_len);
 905         if (!skb) {
 906                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 907                        "request\n", sdata->dev->name);
 908                 return;
 909         }
 910         skb_reserve(skb, local->hw.extra_tx_headroom);
 911
 912         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 913         memset(mgmt, 0, 24);
 914         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 915                                           IEEE80211_STYPE_PROBE_REQ);
 916         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 917         if (dst) {
 918                 memcpy(mgmt->da, dst, ETH_ALEN);
 919                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 920         } else {
 921                 memset(mgmt->da, 0xff, ETH_ALEN);
 922                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 923         }
 924         pos = skb_put(skb, 2 + ssid_len);
 925         *pos++ = WLAN_EID_SSID;
 926         *pos++ = ssid_len;
 927         memcpy(pos, ssid, ssid_len);
 928         pos += ssid_len;
 929
 930         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
 931
 932         ieee80211_tx_skb(sdata, skb, 0);
 933 }
 934
 935 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 936                             struct ieee802_11_elems *elems,
 937                             enum ieee80211_band band)
 938 {
 939         struct ieee80211_supported_band *sband;
 940         struct ieee80211_rate *bitrates;
 941         size_t num_rates;
 942         u32 supp_rates;
 943         int i, j;
 944         sband = local->hw.wiphy->bands[band];
 945
 946         if (!sband) {
 947                 WARN_ON(1);
 948                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 949         }
 950
 951         bitrates = sband->bitrates;
 952         num_rates = sband->n_bitrates;
 953         supp_rates = 0;
 954         for (i = 0; i < elems->supp_rates_len +
 955                      elems->ext_supp_rates_len; i++) {
 956                 u8 rate = 0;
 957                 int own_rate;
 958                 if (i < elems->supp_rates_len)
 959                         rate = elems->supp_rates[i];
 960                 else if (elems->ext_supp_rates)
 961                         rate = elems->ext_supp_rates
 962                                 [i - elems->supp_rates_len];
 963                 own_rate = 5 * (rate & 0x7f);
 964                 for (j = 0; j < num_rates; j++)
 965                         if (bitrates[j].bitrate == own_rate)
 966                                 supp_rates |= BIT(j);
 967         }
 968         return supp_rates;
 969 }
 970
 971 int ieee80211_reconfig(struct ieee80211_local *local)
 972 {
 973         struct ieee80211_hw *hw = &local->hw;
 974         struct ieee80211_sub_if_data *sdata;
 975         struct ieee80211_if_init_conf conf;
 976         struct sta_info *sta;
 977         unsigned long flags;
 978         int res;
 979
 980         /* restart hardware */
 981         if (local->open_count) {
 982                 res = local->ops->start(hw);
 983
 984                 ieee80211_led_radio(local, hw->conf.radio_enabled);
 985         }
 986
 987         /* add interfaces */
 988         list_for_each_entry(sdata, &local->interfaces, list) {
 989                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 990                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 991                     netif_running(sdata->dev)) {
 992                         conf.vif = &sdata->vif;
 993                         conf.type = sdata->vif.type;
 994                         conf.mac_addr = sdata->dev->dev_addr;
 995                         res = local->ops->add_interface(hw, &conf);
 996                 }
 997         }
 998
 999         /* add STAs back */
1000         if (local->ops->sta_notify) {
1001                 spin_lock_irqsave(&local->sta_lock, flags);
1002                 list_for_each_entry(sta, &local->sta_list, list) {
1003                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1004                                 sdata = container_of(sdata->bss,
1005                                              struct ieee80211_sub_if_data,
1006                                              u.ap);
1007
1008                         local->ops->sta_notify(hw, &sdata->vif,
1009                                 STA_NOTIFY_ADD, &sta->sta);
1010                 }
1011                 spin_unlock_irqrestore(&local->sta_lock, flags);
1012         }
1013
1014         /* Clear Suspend state so that ADDBA requests can be processed */
1015
1016         rcu_read_lock();
1017
1018         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1019                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1020                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1021                 }
1022         }
1023
1024         rcu_read_unlock();
1025
1026         /* setup RTS threshold */
1027         if (local->ops->set_rts_threshold)
1028                 local->ops->set_rts_threshold(hw, local->rts_threshold);
1029
1030         /* reconfigure hardware */
1031         ieee80211_hw_config(local, ~0);
1032
1033         netif_addr_lock_bh(local->mdev);
1034         ieee80211_configure_filter(local);
1035         netif_addr_unlock_bh(local->mdev);
1036
1037         /* Finally also reconfigure all the BSS information */
1038         list_for_each_entry(sdata, &local->interfaces, list) {
1039                 u32 changed = ~0;
1040                 if (!netif_running(sdata->dev))
1041                         continue;
1042                 switch (sdata->vif.type) {
1043                 case NL80211_IFTYPE_STATION:
1044                         /* disable beacon change bits */
1045                         changed &= ~IEEE80211_IFCC_BEACON;
1046                         /* fall through */
1047                 case NL80211_IFTYPE_ADHOC:
1048                 case NL80211_IFTYPE_AP:
1049                 case NL80211_IFTYPE_MESH_POINT:
1050                         /*
1051                          * Driver's config_interface can fail if rfkill is
1052                          * enabled. Accommodate this return code.
1053                          * FIXME: When mac80211 has knowledge of rfkill
1054                          * state the code below can change back to:
1055                          *   WARN(ieee80211_if_config(sdata, changed));
1056                          *   ieee80211_bss_info_change_notify(sdata, ~0);
1057                          */
1058                         if (ieee80211_if_config(sdata, changed))
1059                                 printk(KERN_DEBUG "%s: failed to configure interface during resume\n",
1060                                        sdata->dev->name);
1061                         else
1062                                 ieee80211_bss_info_change_notify(sdata, ~0);
1063                         break;
1064                 case NL80211_IFTYPE_WDS:
1065                         break;
1066                 case NL80211_IFTYPE_AP_VLAN:
1067                 case NL80211_IFTYPE_MONITOR:
1068                         /* ignore virtual */
1069                         break;
1070                 case NL80211_IFTYPE_UNSPECIFIED:
1071                 case __NL80211_IFTYPE_AFTER_LAST:
1072                         WARN_ON(1);
1073                         break;
1074                 }
1075         }
1076
1077         /* add back keys */
1078         list_for_each_entry(sdata, &local->interfaces, list)
1079                 if (netif_running(sdata->dev))
1080                         ieee80211_enable_keys(sdata);
1081
1082         ieee80211_wake_queues_by_reason(hw,
1083                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1084
1085         return 0;
1086 }