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 <linux/crc32.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/rtnetlink.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wme.h"
  32 #include "led.h"
  33
  34 /* privid for wiphys to determine whether they belong to us or not */
  35 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  36
  37 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
  38 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  39 const unsigned char rfc1042_header[] __aligned(2) =
  40         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  41
  42 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  43 const unsigned char bridge_tunnel_header[] __aligned(2) =
  44         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  45
  46 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  47 {
  48         struct ieee80211_local *local;
  49         BUG_ON(!wiphy);
  50
  51         local = wiphy_priv(wiphy);
  52         return &local->hw;
  53 }
  54 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  55
  56 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  57                         enum nl80211_iftype type)
  58 {
  59         __le16 fc = hdr->frame_control;
  60
  61          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  62         if (len < 16)
  63                 return NULL;
  64
  65         if (ieee80211_is_data(fc)) {
  66                 if (len < 24) /* drop incorrect hdr len (data) */
  67                         return NULL;
  68
  69                 if (ieee80211_has_a4(fc))
  70                         return NULL;
  71                 if (ieee80211_has_tods(fc))
  72                         return hdr->addr1;
  73                 if (ieee80211_has_fromds(fc))
  74                         return hdr->addr2;
  75
  76                 return hdr->addr3;
  77         }
  78
  79         if (ieee80211_is_mgmt(fc)) {
  80                 if (len < 24) /* drop incorrect hdr len (mgmt) */
  81                         return NULL;
  82                 return hdr->addr3;
  83         }
  84
  85         if (ieee80211_is_ctl(fc)) {
  86                 if(ieee80211_is_pspoll(fc))
  87                         return hdr->addr1;
  88
  89                 if (ieee80211_is_back_req(fc)) {
  90                         switch (type) {
  91                         case NL80211_IFTYPE_STATION:
  92                                 return hdr->addr2;
  93                         case NL80211_IFTYPE_AP:
  94                         case NL80211_IFTYPE_AP_VLAN:
  95                                 return hdr->addr1;
  96                         default:
  97                                 break; /* fall through to the return */
  98                         }
  99                 }
 100         }
 101
 102         return NULL;
 103 }
 104
 105 unsigned int ieee80211_hdrlen(__le16 fc)
 106 {
 107         unsigned int hdrlen = 24;
 108
 109         if (ieee80211_is_data(fc)) {
 110                 if (ieee80211_has_a4(fc))
 111                         hdrlen = 30;
 112                 if (ieee80211_is_data_qos(fc))
 113                         hdrlen += IEEE80211_QOS_CTL_LEN;
 114                 goto out;
 115         }
 116
 117         if (ieee80211_is_ctl(fc)) {
 118                 /*
 119                  * ACK and CTS are 10 bytes, all others 16. To see how
 120                  * to get this condition consider
 121                  *   subtype mask:   0b0000000011110000 (0x00F0)
 122                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 123                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 124                  *   bits that matter:         ^^^      (0x00E0)
 125                  *   value of those: 0b0000000011000000 (0x00C0)
 126                  */
 127                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 128                         hdrlen = 10;
 129                 else
 130                         hdrlen = 16;
 131         }
 132 out:
 133         return hdrlen;
 134 }
 135 EXPORT_SYMBOL(ieee80211_hdrlen);
 136
 137 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 138 {
 139         const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
 140         unsigned int hdrlen;
 141
 142         if (unlikely(skb->len < 10))
 143                 return 0;
 144         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 145         if (unlikely(hdrlen > skb->len))
 146                 return 0;
 147         return hdrlen;
 148 }
 149 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 150
 151 int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 152 {
 153         int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
 154         /* 7.1.3.5a.2 */
 155         switch (ae) {
 156         case 0:
 157                 return 6;
 158         case 1:
 159                 return 12;
 160         case 2:
 161                 return 18;
 162         case 3:
 163                 return 24;
 164         default:
 165                 return 6;
 166         }
 167 }
 168
 169 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
 170 {
 171         struct sk_buff *skb = tx->skb;
 172         struct ieee80211_hdr *hdr;
 173
 174         do {
 175                 hdr = (struct ieee80211_hdr *) skb->data;
 176                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 177         } while ((skb = skb->next));
 178 }
 179
 180 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 181                              int rate, int erp, int short_preamble)
 182 {
 183         int dur;
 184
 185         /* calculate duration (in microseconds, rounded up to next higher
 186          * integer if it includes a fractional microsecond) to send frame of
 187          * len bytes (does not include FCS) at the given rate. Duration will
 188          * also include SIFS.
 189          *
 190          * rate is in 100 kbps, so divident is multiplied by 10 in the
 191          * DIV_ROUND_UP() operations.
 192          */
 193
 194         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 195                 /*
 196                  * OFDM:
 197                  *
 198                  * N_DBPS = DATARATE x 4
 199                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 200                  *      (16 = SIGNAL time, 6 = tail bits)
 201                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 202                  *
 203                  * T_SYM = 4 usec
 204                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 205                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 206                  *      signal ext = 6 usec
 207                  */
 208                 dur = 16; /* SIFS + signal ext */
 209                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 210                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 211                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 212                                         4 * rate); /* T_SYM x N_SYM */
 213         } else {
 214                 /*
 215                  * 802.11b or 802.11g with 802.11b compatibility:
 216                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 217                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 218                  *
 219                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 220                  * aSIFSTime = 10 usec
 221                  * aPreambleLength = 144 usec or 72 usec with short preamble
 222                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 223                  */
 224                 dur = 10; /* aSIFSTime = 10 usec */
 225                 dur += short_preamble ? (72 + 24) : (144 + 48);
 226
 227                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 228         }
 229
 230         return dur;
 231 }
 232
 233 /* Exported duration function for driver use */
 234 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 235                                         struct ieee80211_vif *vif,
 236                                         size_t frame_len,
 237                                         struct ieee80211_rate *rate)
 238 {
 239         struct ieee80211_local *local = hw_to_local(hw);
 240         struct ieee80211_sub_if_data *sdata;
 241         u16 dur;
 242         int erp;
 243         bool short_preamble = false;
 244
 245         erp = 0;
 246         if (vif) {
 247                 sdata = vif_to_sdata(vif);
 248                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 249                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 250                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 251         }
 252
 253         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 254                                        short_preamble);
 255
 256         return cpu_to_le16(dur);
 257 }
 258 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 259
 260 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 261                               struct ieee80211_vif *vif, size_t frame_len,
 262                               const struct ieee80211_tx_info *frame_txctl)
 263 {
 264         struct ieee80211_local *local = hw_to_local(hw);
 265         struct ieee80211_rate *rate;
 266         struct ieee80211_sub_if_data *sdata;
 267         bool short_preamble;
 268         int erp;
 269         u16 dur;
 270         struct ieee80211_supported_band *sband;
 271
 272         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 273
 274         short_preamble = false;
 275
 276         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 277
 278         erp = 0;
 279         if (vif) {
 280                 sdata = vif_to_sdata(vif);
 281                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 282                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 283                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 284         }
 285
 286         /* CTS duration */
 287         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 288                                        erp, short_preamble);
 289         /* Data frame duration */
 290         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 291                                         erp, short_preamble);
 292         /* ACK duration */
 293         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 294                                         erp, short_preamble);
 295
 296         return cpu_to_le16(dur);
 297 }
 298 EXPORT_SYMBOL(ieee80211_rts_duration);
 299
 300 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 301                                     struct ieee80211_vif *vif,
 302                                     size_t frame_len,
 303                                     const struct ieee80211_tx_info *frame_txctl)
 304 {
 305         struct ieee80211_local *local = hw_to_local(hw);
 306         struct ieee80211_rate *rate;
 307         struct ieee80211_sub_if_data *sdata;
 308         bool short_preamble;
 309         int erp;
 310         u16 dur;
 311         struct ieee80211_supported_band *sband;
 312
 313         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 314
 315         short_preamble = false;
 316
 317         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 318         erp = 0;
 319         if (vif) {
 320                 sdata = vif_to_sdata(vif);
 321                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
 322                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 323                         erp = rate->flags & IEEE80211_RATE_ERP_G;
 324         }
 325
 326         /* Data frame duration */
 327         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 328                                        erp, short_preamble);
 329         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 330                 /* ACK duration */
 331                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 332                                                 erp, short_preamble);
 333         }
 334
 335         return cpu_to_le16(dur);
 336 }
 337 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 338
 339 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 340                                    enum queue_stop_reason reason)
 341 {
 342         struct ieee80211_local *local = hw_to_local(hw);
 343
 344         if (WARN_ON(queue >= hw->queues))
 345                 return;
 346
 347         __clear_bit(reason, &local->queue_stop_reasons[queue]);
 348
 349         if (!skb_queue_empty(&local->pending[queue]) &&
 350             local->queue_stop_reasons[queue] ==
 351                                 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
 352                 tasklet_schedule(&local->tx_pending_tasklet);
 353
 354         if (local->queue_stop_reasons[queue] != 0)
 355                 /* someone still has this queue stopped */
 356                 return;
 357
 358         netif_wake_subqueue(local->mdev, queue);
 359 }
 360
 361 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 362                                     enum queue_stop_reason reason)
 363 {
 364         struct ieee80211_local *local = hw_to_local(hw);
 365         unsigned long flags;
 366
 367         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 368         __ieee80211_wake_queue(hw, queue, reason);
 369         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 370 }
 371
 372 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 373 {
 374         ieee80211_wake_queue_by_reason(hw, queue,
 375                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 376 }
 377 EXPORT_SYMBOL(ieee80211_wake_queue);
 378
 379 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 380                                    enum queue_stop_reason reason)
 381 {
 382         struct ieee80211_local *local = hw_to_local(hw);
 383
 384         if (WARN_ON(queue >= hw->queues))
 385                 return;
 386
 387         /*
 388          * Only stop if it was previously running, this is necessary
 389          * for correct pending packets handling because there we may
 390          * start (but not wake) the queue and rely on that.
 391          */
 392         if (!local->queue_stop_reasons[queue])
 393                 netif_stop_subqueue(local->mdev, queue);
 394
 395         __set_bit(reason, &local->queue_stop_reasons[queue]);
 396 }
 397
 398 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 399                                     enum queue_stop_reason reason)
 400 {
 401         struct ieee80211_local *local = hw_to_local(hw);
 402         unsigned long flags;
 403
 404         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 405         __ieee80211_stop_queue(hw, queue, reason);
 406         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 407 }
 408
 409 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 410 {
 411         ieee80211_stop_queue_by_reason(hw, queue,
 412                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 413 }
 414 EXPORT_SYMBOL(ieee80211_stop_queue);
 415
 416 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 417                                     enum queue_stop_reason reason)
 418 {
 419         struct ieee80211_local *local = hw_to_local(hw);
 420         unsigned long flags;
 421         int i;
 422
 423         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 424
 425         for (i = 0; i < hw->queues; i++)
 426                 __ieee80211_stop_queue(hw, i, reason);
 427
 428         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 429 }
 430
 431 void ieee80211_stop_queues(struct ieee80211_hw *hw)
 432 {
 433         ieee80211_stop_queues_by_reason(hw,
 434                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
 435 }
 436 EXPORT_SYMBOL(ieee80211_stop_queues);
 437
 438 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 439 {
 440         struct ieee80211_local *local = hw_to_local(hw);
 441
 442         if (WARN_ON(queue >= hw->queues))
 443                 return true;
 444
 445         return __netif_subqueue_stopped(local->mdev, queue);
 446 }
 447 EXPORT_SYMBOL(ieee80211_queue_stopped);
 448
 449 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 450                                      enum queue_stop_reason reason)
 451 {
 452         struct ieee80211_local *local = hw_to_local(hw);
 453         unsigned long flags;
 454         int i;
 455
 456         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 457
 458         for (i = 0; i < hw->queues; i++)
 459                 __ieee80211_wake_queue(hw, i, reason);
 460
 461         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 462 }
 463
 464 void ieee80211_wake_queues(struct ieee80211_hw *hw)
 465 {
 466         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 467 }
 468 EXPORT_SYMBOL(ieee80211_wake_queues);
 469
 470 void ieee80211_iterate_active_interfaces(
 471         struct ieee80211_hw *hw,
 472         void (*iterator)(void *data, u8 *mac,
 473                          struct ieee80211_vif *vif),
 474         void *data)
 475 {
 476         struct ieee80211_local *local = hw_to_local(hw);
 477         struct ieee80211_sub_if_data *sdata;
 478
 479         mutex_lock(&local->iflist_mtx);
 480
 481         list_for_each_entry(sdata, &local->interfaces, list) {
 482                 switch (sdata->vif.type) {
 483                 case __NL80211_IFTYPE_AFTER_LAST:
 484                 case NL80211_IFTYPE_UNSPECIFIED:
 485                 case NL80211_IFTYPE_MONITOR:
 486                 case NL80211_IFTYPE_AP_VLAN:
 487                         continue;
 488                 case NL80211_IFTYPE_AP:
 489                 case NL80211_IFTYPE_STATION:
 490                 case NL80211_IFTYPE_ADHOC:
 491                 case NL80211_IFTYPE_WDS:
 492                 case NL80211_IFTYPE_MESH_POINT:
 493                         break;
 494                 }
 495                 if (netif_running(sdata->dev))
 496                         iterator(data, sdata->dev->dev_addr,
 497                                  &sdata->vif);
 498         }
 499
 500         mutex_unlock(&local->iflist_mtx);
 501 }
 502 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 503
 504 void ieee80211_iterate_active_interfaces_atomic(
 505         struct ieee80211_hw *hw,
 506         void (*iterator)(void *data, u8 *mac,
 507                          struct ieee80211_vif *vif),
 508         void *data)
 509 {
 510         struct ieee80211_local *local = hw_to_local(hw);
 511         struct ieee80211_sub_if_data *sdata;
 512
 513         rcu_read_lock();
 514
 515         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 516                 switch (sdata->vif.type) {
 517                 case __NL80211_IFTYPE_AFTER_LAST:
 518                 case NL80211_IFTYPE_UNSPECIFIED:
 519                 case NL80211_IFTYPE_MONITOR:
 520                 case NL80211_IFTYPE_AP_VLAN:
 521                         continue;
 522                 case NL80211_IFTYPE_AP:
 523                 case NL80211_IFTYPE_STATION:
 524                 case NL80211_IFTYPE_ADHOC:
 525                 case NL80211_IFTYPE_WDS:
 526                 case NL80211_IFTYPE_MESH_POINT:
 527                         break;
 528                 }
 529                 if (netif_running(sdata->dev))
 530                         iterator(data, sdata->dev->dev_addr,
 531                                  &sdata->vif);
 532         }
 533
 534         rcu_read_unlock();
 535 }
 536 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 537
 538 void ieee802_11_parse_elems(u8 *start, size_t len,
 539                             struct ieee802_11_elems *elems)
 540 {
 541         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 542 }
 543
 544 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 545                                struct ieee802_11_elems *elems,
 546                                u64 filter, u32 crc)
 547 {
 548         size_t left = len;
 549         u8 *pos = start;
 550         bool calc_crc = filter != 0;
 551
 552         memset(elems, 0, sizeof(*elems));
 553         elems->ie_start = start;
 554         elems->total_len = len;
 555
 556         while (left >= 2) {
 557                 u8 id, elen;
 558
 559                 id = *pos++;
 560                 elen = *pos++;
 561                 left -= 2;
 562
 563                 if (elen > left)
 564                         break;
 565
 566                 if (calc_crc && id < 64 && (filter & BIT(id)))
 567                         crc = crc32_be(crc, pos - 2, elen + 2);
 568
 569                 switch (id) {
 570                 case WLAN_EID_SSID:
 571                         elems->ssid = pos;
 572                         elems->ssid_len = elen;
 573                         break;
 574                 case WLAN_EID_SUPP_RATES:
 575                         elems->supp_rates = pos;
 576                         elems->supp_rates_len = elen;
 577                         break;
 578                 case WLAN_EID_FH_PARAMS:
 579                         elems->fh_params = pos;
 580                         elems->fh_params_len = elen;
 581                         break;
 582                 case WLAN_EID_DS_PARAMS:
 583                         elems->ds_params = pos;
 584                         elems->ds_params_len = elen;
 585                         break;
 586                 case WLAN_EID_CF_PARAMS:
 587                         elems->cf_params = pos;
 588                         elems->cf_params_len = elen;
 589                         break;
 590                 case WLAN_EID_TIM:
 591                         elems->tim = pos;
 592                         elems->tim_len = elen;
 593                         break;
 594                 case WLAN_EID_IBSS_PARAMS:
 595                         elems->ibss_params = pos;
 596                         elems->ibss_params_len = elen;
 597                         break;
 598                 case WLAN_EID_CHALLENGE:
 599                         elems->challenge = pos;
 600                         elems->challenge_len = elen;
 601                         break;
 602                 case WLAN_EID_VENDOR_SPECIFIC:
 603                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 604                             pos[2] == 0xf2) {
 605                                 /* Microsoft OUI (00:50:F2) */
 606
 607                                 if (calc_crc)
 608                                         crc = crc32_be(crc, pos - 2, elen + 2);
 609
 610                                 if (pos[3] == 1) {
 611                                         /* OUI Type 1 - WPA IE */
 612                                         elems->wpa = pos;
 613                                         elems->wpa_len = elen;
 614                                 } else if (elen >= 5 && pos[3] == 2) {
 615                                         /* OUI Type 2 - WMM IE */
 616                                         if (pos[4] == 0) {
 617                                                 elems->wmm_info = pos;
 618                                                 elems->wmm_info_len = elen;
 619                                         } else if (pos[4] == 1) {
 620                                                 elems->wmm_param = pos;
 621                                                 elems->wmm_param_len = elen;
 622                                         }
 623                                 }
 624                         }
 625                         break;
 626                 case WLAN_EID_RSN:
 627                         elems->rsn = pos;
 628                         elems->rsn_len = elen;
 629                         break;
 630                 case WLAN_EID_ERP_INFO:
 631                         elems->erp_info = pos;
 632                         elems->erp_info_len = elen;
 633                         break;
 634                 case WLAN_EID_EXT_SUPP_RATES:
 635                         elems->ext_supp_rates = pos;
 636                         elems->ext_supp_rates_len = elen;
 637                         break;
 638                 case WLAN_EID_HT_CAPABILITY:
 639                         if (elen >= sizeof(struct ieee80211_ht_cap))
 640                                 elems->ht_cap_elem = (void *)pos;
 641                         break;
 642                 case WLAN_EID_HT_INFORMATION:
 643                         if (elen >= sizeof(struct ieee80211_ht_info))
 644                                 elems->ht_info_elem = (void *)pos;
 645                         break;
 646                 case WLAN_EID_MESH_ID:
 647                         elems->mesh_id = pos;
 648                         elems->mesh_id_len = elen;
 649                         break;
 650                 case WLAN_EID_MESH_CONFIG:
 651                         elems->mesh_config = pos;
 652                         elems->mesh_config_len = elen;
 653                         break;
 654                 case WLAN_EID_PEER_LINK:
 655                         elems->peer_link = pos;
 656                         elems->peer_link_len = elen;
 657                         break;
 658                 case WLAN_EID_PREQ:
 659                         elems->preq = pos;
 660                         elems->preq_len = elen;
 661                         break;
 662                 case WLAN_EID_PREP:
 663                         elems->prep = pos;
 664                         elems->prep_len = elen;
 665                         break;
 666                 case WLAN_EID_PERR:
 667                         elems->perr = pos;
 668                         elems->perr_len = elen;
 669                         break;
 670                 case WLAN_EID_CHANNEL_SWITCH:
 671                         elems->ch_switch_elem = pos;
 672                         elems->ch_switch_elem_len = elen;
 673                         break;
 674                 case WLAN_EID_QUIET:
 675                         if (!elems->quiet_elem) {
 676                                 elems->quiet_elem = pos;
 677                                 elems->quiet_elem_len = elen;
 678                         }
 679                         elems->num_of_quiet_elem++;
 680                         break;
 681                 case WLAN_EID_COUNTRY:
 682                         elems->country_elem = pos;
 683                         elems->country_elem_len = elen;
 684                         break;
 685                 case WLAN_EID_PWR_CONSTRAINT:
 686                         elems->pwr_constr_elem = pos;
 687                         elems->pwr_constr_elem_len = elen;
 688                         break;
 689                 case WLAN_EID_TIMEOUT_INTERVAL:
 690                         elems->timeout_int = pos;
 691                         elems->timeout_int_len = elen;
 692                         break;
 693                 default:
 694                         break;
 695                 }
 696
 697                 left -= elen;
 698                 pos += elen;
 699         }
 700
 701         return crc;
 702 }
 703
 704 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 705 {
 706         struct ieee80211_local *local = sdata->local;
 707         struct ieee80211_tx_queue_params qparam;
 708         int i;
 709
 710         if (!local->ops->conf_tx)
 711                 return;
 712
 713         memset(&qparam, 0, sizeof(qparam));
 714
 715         qparam.aifs = 2;
 716
 717         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 718             !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
 719                 qparam.cw_min = 31;
 720         else
 721                 qparam.cw_min = 15;
 722
 723         qparam.cw_max = 1023;
 724         qparam.txop = 0;
 725
 726         for (i = 0; i < local_to_hw(local)->queues; i++)
 727                 local->ops->conf_tx(local_to_hw(local), i, &qparam);
 728 }
 729
 730 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 731                                   const size_t supp_rates_len,
 732                                   const u8 *supp_rates)
 733 {
 734         struct ieee80211_local *local = sdata->local;
 735         int i, have_higher_than_11mbit = 0;
 736
 737         /* cf. IEEE 802.11 9.2.12 */
 738         for (i = 0; i < supp_rates_len; i++)
 739                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 740                         have_higher_than_11mbit = 1;
 741
 742         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 743             have_higher_than_11mbit)
 744                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 745         else
 746                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 747
 748         ieee80211_set_wmm_default(sdata);
 749 }
 750
 751 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 752                       int encrypt)
 753 {
 754         skb->dev = sdata->local->mdev;
 755         skb_set_mac_header(skb, 0);
 756         skb_set_network_header(skb, 0);
 757         skb_set_transport_header(skb, 0);
 758
 759         skb->iif = sdata->dev->ifindex;
 760         skb->do_not_encrypt = !encrypt;
 761
 762         dev_queue_xmit(skb);
 763 }
 764
 765 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
 766 {
 767         int ret = -EINVAL;
 768         struct ieee80211_channel *chan;
 769         struct ieee80211_local *local = sdata->local;
 770
 771         chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
 772
 773         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
 774                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 775                     chan->flags & IEEE80211_CHAN_NO_IBSS)
 776                         return ret;
 777                 local->oper_channel = chan;
 778                 local->oper_channel_type = NL80211_CHAN_NO_HT;
 779
 780                 if (local->sw_scanning || local->hw_scanning)
 781                         ret = 0;
 782                 else
 783                         ret = ieee80211_hw_config(
 784                                 local, IEEE80211_CONF_CHANGE_CHANNEL);
 785         }
 786
 787         return ret;
 788 }
 789
 790 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 791                               enum ieee80211_band band)
 792 {
 793         struct ieee80211_supported_band *sband;
 794         struct ieee80211_rate *bitrates;
 795         u32 mandatory_rates;
 796         enum ieee80211_rate_flags mandatory_flag;
 797         int i;
 798
 799         sband = local->hw.wiphy->bands[band];
 800         if (!sband) {
 801                 WARN_ON(1);
 802                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 803         }
 804
 805         if (band == IEEE80211_BAND_2GHZ)
 806                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 807         else
 808                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 809
 810         bitrates = sband->bitrates;
 811         mandatory_rates = 0;
 812         for (i = 0; i < sband->n_bitrates; i++)
 813                 if (bitrates[i].flags & mandatory_flag)
 814                         mandatory_rates |= BIT(i);
 815         return mandatory_rates;
 816 }
 817
 818 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 819                          u16 transaction, u16 auth_alg,
 820                          u8 *extra, size_t extra_len,
 821                          const u8 *bssid, int encrypt)
 822 {
 823         struct ieee80211_local *local = sdata->local;
 824         struct sk_buff *skb;
 825         struct ieee80211_mgmt *mgmt;
 826
 827         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 828                             sizeof(*mgmt) + 6 + extra_len);
 829         if (!skb) {
 830                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 831                        "frame\n", sdata->dev->name);
 832                 return;
 833         }
 834         skb_reserve(skb, local->hw.extra_tx_headroom);
 835
 836         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 837         memset(mgmt, 0, 24 + 6);
 838         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 839                                           IEEE80211_STYPE_AUTH);
 840         if (encrypt)
 841                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 842         memcpy(mgmt->da, bssid, ETH_ALEN);
 843         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 844         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 845         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 846         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 847         mgmt->u.auth.status_code = cpu_to_le16(0);
 848         if (extra)
 849                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 850
 851         ieee80211_tx_skb(sdata, skb, encrypt);
 852 }
 853
 854 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 855                              const u8 *ie, size_t ie_len)
 856 {
 857         struct ieee80211_supported_band *sband;
 858         u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
 859         int i;
 860
 861         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 862
 863         pos = buffer;
 864
 865         *pos++ = WLAN_EID_SUPP_RATES;
 866         supp_rates_len = pos;
 867         *pos++ = 0;
 868
 869         for (i = 0; i < sband->n_bitrates; i++) {
 870                 struct ieee80211_rate *rate = &sband->bitrates[i];
 871
 872                 if (esupp_rates_len) {
 873                         *esupp_rates_len += 1;
 874                 } else if (*supp_rates_len == 8) {
 875                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
 876                         esupp_rates_len = pos;
 877                         *pos++ = 1;
 878                 } else
 879                         *supp_rates_len += 1;
 880
 881                 *pos++ = rate->bitrate / 5;
 882         }
 883
 884         if (sband->ht_cap.ht_supported) {
 885                 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
 886
 887                 *pos++ = WLAN_EID_HT_CAPABILITY;
 888                 *pos++ = sizeof(struct ieee80211_ht_cap);
 889                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 890                 memcpy(pos, &tmp, sizeof(u16));
 891                 pos += sizeof(u16);
 892                 /* TODO: needs a define here for << 2 */
 893                 *pos++ = sband->ht_cap.ampdu_factor |
 894                          (sband->ht_cap.ampdu_density << 2);
 895                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 896                 pos += sizeof(sband->ht_cap.mcs);
 897                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
 898         }
 899
 900         /*
 901          * If adding more here, adjust code in main.c
 902          * that calculates local->scan_ies_len.
 903          */
 904
 905         if (ie) {
 906                 memcpy(pos, ie, ie_len);
 907                 pos += ie_len;
 908         }
 909
 910         return pos - buffer;
 911 }
 912
 913 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 914                               const u8 *ssid, size_t ssid_len,
 915                               const u8 *ie, size_t ie_len)
 916 {
 917         struct ieee80211_local *local = sdata->local;
 918         struct sk_buff *skb;
 919         struct ieee80211_mgmt *mgmt;
 920         u8 *pos;
 921
 922         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 923                             ie_len);
 924         if (!skb) {
 925                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 926                        "request\n", sdata->dev->name);
 927                 return;
 928         }
 929         skb_reserve(skb, local->hw.extra_tx_headroom);
 930
 931         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 932         memset(mgmt, 0, 24);
 933         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 934                                           IEEE80211_STYPE_PROBE_REQ);
 935         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 936         if (dst) {
 937                 memcpy(mgmt->da, dst, ETH_ALEN);
 938                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 939         } else {
 940                 memset(mgmt->da, 0xff, ETH_ALEN);
 941                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 942         }
 943         pos = skb_put(skb, 2 + ssid_len);
 944         *pos++ = WLAN_EID_SSID;
 945         *pos++ = ssid_len;
 946         memcpy(pos, ssid, ssid_len);
 947         pos += ssid_len;
 948
 949         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
 950
 951         ieee80211_tx_skb(sdata, skb, 0);
 952 }
 953
 954 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 955                             struct ieee802_11_elems *elems,
 956                             enum ieee80211_band band)
 957 {
 958         struct ieee80211_supported_band *sband;
 959         struct ieee80211_rate *bitrates;
 960         size_t num_rates;
 961         u32 supp_rates;
 962         int i, j;
 963         sband = local->hw.wiphy->bands[band];
 964
 965         if (!sband) {
 966                 WARN_ON(1);
 967                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 968         }
 969
 970         bitrates = sband->bitrates;
 971         num_rates = sband->n_bitrates;
 972         supp_rates = 0;
 973         for (i = 0; i < elems->supp_rates_len +
 974                      elems->ext_supp_rates_len; i++) {
 975                 u8 rate = 0;
 976                 int own_rate;
 977                 if (i < elems->supp_rates_len)
 978                         rate = elems->supp_rates[i];
 979                 else if (elems->ext_supp_rates)
 980                         rate = elems->ext_supp_rates
 981                                 [i - elems->supp_rates_len];
 982                 own_rate = 5 * (rate & 0x7f);
 983                 for (j = 0; j < num_rates; j++)
 984                         if (bitrates[j].bitrate == own_rate)
 985                                 supp_rates |= BIT(j);
 986         }
 987         return supp_rates;
 988 }
 989
 990 int ieee80211_reconfig(struct ieee80211_local *local)
 991 {
 992         struct ieee80211_hw *hw = &local->hw;
 993         struct ieee80211_sub_if_data *sdata;
 994         struct ieee80211_if_init_conf conf;
 995         struct sta_info *sta;
 996         unsigned long flags;
 997         int res;
 998
 999         /* restart hardware */
1000         if (local->open_count) {
1001                 res = local->ops->start(hw);
1002
1003                 ieee80211_led_radio(local, hw->conf.radio_enabled);
1004         }
1005
1006         /* add interfaces */
1007         list_for_each_entry(sdata, &local->interfaces, list) {
1008                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1009                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1010                     netif_running(sdata->dev)) {
1011                         conf.vif = &sdata->vif;
1012                         conf.type = sdata->vif.type;
1013                         conf.mac_addr = sdata->dev->dev_addr;
1014                         res = local->ops->add_interface(hw, &conf);
1015                 }
1016         }
1017
1018         /* add STAs back */
1019         if (local->ops->sta_notify) {
1020                 spin_lock_irqsave(&local->sta_lock, flags);
1021                 list_for_each_entry(sta, &local->sta_list, list) {
1022                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1023                                 sdata = container_of(sdata->bss,
1024                                              struct ieee80211_sub_if_data,
1025                                              u.ap);
1026
1027                         local->ops->sta_notify(hw, &sdata->vif,
1028                                 STA_NOTIFY_ADD, &sta->sta);
1029                 }
1030                 spin_unlock_irqrestore(&local->sta_lock, flags);
1031         }
1032
1033         /* Clear Suspend state so that ADDBA requests can be processed */
1034
1035         rcu_read_lock();
1036
1037         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1038                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1039                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1040                 }
1041         }
1042
1043         rcu_read_unlock();
1044
1045         /* setup RTS threshold */
1046         if (local->ops->set_rts_threshold)
1047                 local->ops->set_rts_threshold(hw, hw->wiphy->rts_threshold);
1048
1049         /* reconfigure hardware */
1050         ieee80211_hw_config(local, ~0);
1051
1052         netif_addr_lock_bh(local->mdev);
1053         ieee80211_configure_filter(local);
1054         netif_addr_unlock_bh(local->mdev);
1055
1056         /* Finally also reconfigure all the BSS information */
1057         list_for_each_entry(sdata, &local->interfaces, list) {
1058                 u32 changed = ~0;
1059                 if (!netif_running(sdata->dev))
1060                         continue;
1061                 switch (sdata->vif.type) {
1062                 case NL80211_IFTYPE_STATION:
1063                         /* disable beacon change bits */
1064                         changed &= ~IEEE80211_IFCC_BEACON;
1065                         /* fall through */
1066                 case NL80211_IFTYPE_ADHOC:
1067                 case NL80211_IFTYPE_AP:
1068                 case NL80211_IFTYPE_MESH_POINT:
1069                         /*
1070                          * Driver's config_interface can fail if rfkill is
1071                          * enabled. Accommodate this return code.
1072                          * FIXME: When mac80211 has knowledge of rfkill
1073                          * state the code below can change back to:
1074                          *   WARN(ieee80211_if_config(sdata, changed));
1075                          *   ieee80211_bss_info_change_notify(sdata, ~0);
1076                          */
1077                         if (ieee80211_if_config(sdata, changed))
1078                                 printk(KERN_DEBUG "%s: failed to configure interface during resume\n",
1079                                        sdata->dev->name);
1080                         else
1081                                 ieee80211_bss_info_change_notify(sdata, ~0);
1082                         break;
1083                 case NL80211_IFTYPE_WDS:
1084                         break;
1085                 case NL80211_IFTYPE_AP_VLAN:
1086                 case NL80211_IFTYPE_MONITOR:
1087                         /* ignore virtual */
1088                         break;
1089                 case NL80211_IFTYPE_UNSPECIFIED:
1090                 case __NL80211_IFTYPE_AFTER_LAST:
1091                         WARN_ON(1);
1092                         break;
1093                 }
1094         }
1095
1096         /* add back keys */
1097         list_for_each_entry(sdata, &local->interfaces, list)
1098                 if (netif_running(sdata->dev))
1099                         ieee80211_enable_keys(sdata);
1100
1101         ieee80211_wake_queues_by_reason(hw,
1102                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1103
1104         return 0;
1105 }