linux/net/mac80211/util.c
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   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/export.h>
  17#include <linux/types.h>
  18#include <linux/slab.h>
  19#include <linux/skbuff.h>
  20#include <linux/etherdevice.h>
  21#include <linux/if_arp.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 "driver-ops.h"
  30#include "rate.h"
  31#include "mesh.h"
  32#include "wme.h"
  33#include "led.h"
  34#include "wep.h"
  35
  36/* privid for wiphys to determine whether they belong to us or not */
  37void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  38
  39struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  40{
  41        struct ieee80211_local *local;
  42        BUG_ON(!wiphy);
  43
  44        local = wiphy_priv(wiphy);
  45        return &local->hw;
  46}
  47EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  48
  49u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  50                        enum nl80211_iftype type)
  51{
  52        __le16 fc = hdr->frame_control;
  53
  54         /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  55        if (len < 16)
  56                return NULL;
  57
  58        if (ieee80211_is_data(fc)) {
  59                if (len < 24) /* drop incorrect hdr len (data) */
  60                        return NULL;
  61
  62                if (ieee80211_has_a4(fc))
  63                        return NULL;
  64                if (ieee80211_has_tods(fc))
  65                        return hdr->addr1;
  66                if (ieee80211_has_fromds(fc))
  67                        return hdr->addr2;
  68
  69                return hdr->addr3;
  70        }
  71
  72        if (ieee80211_is_mgmt(fc)) {
  73                if (len < 24) /* drop incorrect hdr len (mgmt) */
  74                        return NULL;
  75                return hdr->addr3;
  76        }
  77
  78        if (ieee80211_is_ctl(fc)) {
  79                if(ieee80211_is_pspoll(fc))
  80                        return hdr->addr1;
  81
  82                if (ieee80211_is_back_req(fc)) {
  83                        switch (type) {
  84                        case NL80211_IFTYPE_STATION:
  85                                return hdr->addr2;
  86                        case NL80211_IFTYPE_AP:
  87                        case NL80211_IFTYPE_AP_VLAN:
  88                                return hdr->addr1;
  89                        default:
  90                                break; /* fall through to the return */
  91                        }
  92                }
  93        }
  94
  95        return NULL;
  96}
  97
  98void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  99{
 100        struct sk_buff *skb;
 101        struct ieee80211_hdr *hdr;
 102
 103        skb_queue_walk(&tx->skbs, skb) {
 104                hdr = (struct ieee80211_hdr *) skb->data;
 105                hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 106        }
 107}
 108
 109int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 110                             int rate, int erp, int short_preamble)
 111{
 112        int dur;
 113
 114        /* calculate duration (in microseconds, rounded up to next higher
 115         * integer if it includes a fractional microsecond) to send frame of
 116         * len bytes (does not include FCS) at the given rate. Duration will
 117         * also include SIFS.
 118         *
 119         * rate is in 100 kbps, so divident is multiplied by 10 in the
 120         * DIV_ROUND_UP() operations.
 121         */
 122
 123        if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 124                /*
 125                 * OFDM:
 126                 *
 127                 * N_DBPS = DATARATE x 4
 128                 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 129                 *      (16 = SIGNAL time, 6 = tail bits)
 130                 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 131                 *
 132                 * T_SYM = 4 usec
 133                 * 802.11a - 17.5.2: aSIFSTime = 16 usec
 134                 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 135                 *      signal ext = 6 usec
 136                 */
 137                dur = 16; /* SIFS + signal ext */
 138                dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 139                dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 140                dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 141                                        4 * rate); /* T_SYM x N_SYM */
 142        } else {
 143                /*
 144                 * 802.11b or 802.11g with 802.11b compatibility:
 145                 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 146                 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 147                 *
 148                 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 149                 * aSIFSTime = 10 usec
 150                 * aPreambleLength = 144 usec or 72 usec with short preamble
 151                 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 152                 */
 153                dur = 10; /* aSIFSTime = 10 usec */
 154                dur += short_preamble ? (72 + 24) : (144 + 48);
 155
 156                dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 157        }
 158
 159        return dur;
 160}
 161
 162/* Exported duration function for driver use */
 163__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 164                                        struct ieee80211_vif *vif,
 165                                        size_t frame_len,
 166                                        struct ieee80211_rate *rate)
 167{
 168        struct ieee80211_local *local = hw_to_local(hw);
 169        struct ieee80211_sub_if_data *sdata;
 170        u16 dur;
 171        int erp;
 172        bool short_preamble = false;
 173
 174        erp = 0;
 175        if (vif) {
 176                sdata = vif_to_sdata(vif);
 177                short_preamble = sdata->vif.bss_conf.use_short_preamble;
 178                if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 179                        erp = rate->flags & IEEE80211_RATE_ERP_G;
 180        }
 181
 182        dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 183                                       short_preamble);
 184
 185        return cpu_to_le16(dur);
 186}
 187EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 188
 189__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 190                              struct ieee80211_vif *vif, size_t frame_len,
 191                              const struct ieee80211_tx_info *frame_txctl)
 192{
 193        struct ieee80211_local *local = hw_to_local(hw);
 194        struct ieee80211_rate *rate;
 195        struct ieee80211_sub_if_data *sdata;
 196        bool short_preamble;
 197        int erp;
 198        u16 dur;
 199        struct ieee80211_supported_band *sband;
 200
 201        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 202
 203        short_preamble = false;
 204
 205        rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 206
 207        erp = 0;
 208        if (vif) {
 209                sdata = vif_to_sdata(vif);
 210                short_preamble = sdata->vif.bss_conf.use_short_preamble;
 211                if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 212                        erp = rate->flags & IEEE80211_RATE_ERP_G;
 213        }
 214
 215        /* CTS duration */
 216        dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 217                                       erp, short_preamble);
 218        /* Data frame duration */
 219        dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 220                                        erp, short_preamble);
 221        /* ACK duration */
 222        dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 223                                        erp, short_preamble);
 224
 225        return cpu_to_le16(dur);
 226}
 227EXPORT_SYMBOL(ieee80211_rts_duration);
 228
 229__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 230                                    struct ieee80211_vif *vif,
 231                                    size_t frame_len,
 232                                    const struct ieee80211_tx_info *frame_txctl)
 233{
 234        struct ieee80211_local *local = hw_to_local(hw);
 235        struct ieee80211_rate *rate;
 236        struct ieee80211_sub_if_data *sdata;
 237        bool short_preamble;
 238        int erp;
 239        u16 dur;
 240        struct ieee80211_supported_band *sband;
 241
 242        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 243
 244        short_preamble = false;
 245
 246        rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 247        erp = 0;
 248        if (vif) {
 249                sdata = vif_to_sdata(vif);
 250                short_preamble = sdata->vif.bss_conf.use_short_preamble;
 251                if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 252                        erp = rate->flags & IEEE80211_RATE_ERP_G;
 253        }
 254
 255        /* Data frame duration */
 256        dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 257                                       erp, short_preamble);
 258        if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 259                /* ACK duration */
 260                dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 261                                                erp, short_preamble);
 262        }
 263
 264        return cpu_to_le16(dur);
 265}
 266EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 269                                   enum queue_stop_reason reason)
 270{
 271        struct ieee80211_local *local = hw_to_local(hw);
 272        struct ieee80211_sub_if_data *sdata;
 273
 274        trace_wake_queue(local, queue, reason);
 275
 276        if (WARN_ON(queue >= hw->queues))
 277                return;
 278
 279        __clear_bit(reason, &local->queue_stop_reasons[queue]);
 280
 281        if (local->queue_stop_reasons[queue] != 0)
 282                /* someone still has this queue stopped */
 283                return;
 284
 285        if (skb_queue_empty(&local->pending[queue])) {
 286                rcu_read_lock();
 287                list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 288                        if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 289                                continue;
 290                        netif_wake_subqueue(sdata->dev, queue);
 291                }
 292                rcu_read_unlock();
 293        } else
 294                tasklet_schedule(&local->tx_pending_tasklet);
 295}
 296
 297void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 298                                    enum queue_stop_reason reason)
 299{
 300        struct ieee80211_local *local = hw_to_local(hw);
 301        unsigned long flags;
 302
 303        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 304        __ieee80211_wake_queue(hw, queue, reason);
 305        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 306}
 307
 308void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 309{
 310        ieee80211_wake_queue_by_reason(hw, queue,
 311                                       IEEE80211_QUEUE_STOP_REASON_DRIVER);
 312}
 313EXPORT_SYMBOL(ieee80211_wake_queue);
 314
 315static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 316                                   enum queue_stop_reason reason)
 317{
 318        struct ieee80211_local *local = hw_to_local(hw);
 319        struct ieee80211_sub_if_data *sdata;
 320
 321        trace_stop_queue(local, queue, reason);
 322
 323        if (WARN_ON(queue >= hw->queues))
 324                return;
 325
 326        __set_bit(reason, &local->queue_stop_reasons[queue]);
 327
 328        rcu_read_lock();
 329        list_for_each_entry_rcu(sdata, &local->interfaces, list)
 330                netif_stop_subqueue(sdata->dev, queue);
 331        rcu_read_unlock();
 332}
 333
 334void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 335                                    enum queue_stop_reason reason)
 336{
 337        struct ieee80211_local *local = hw_to_local(hw);
 338        unsigned long flags;
 339
 340        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 341        __ieee80211_stop_queue(hw, queue, reason);
 342        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 343}
 344
 345void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 346{
 347        ieee80211_stop_queue_by_reason(hw, queue,
 348                                       IEEE80211_QUEUE_STOP_REASON_DRIVER);
 349}
 350EXPORT_SYMBOL(ieee80211_stop_queue);
 351
 352void ieee80211_add_pending_skb(struct ieee80211_local *local,
 353                               struct sk_buff *skb)
 354{
 355        struct ieee80211_hw *hw = &local->hw;
 356        unsigned long flags;
 357        int queue = skb_get_queue_mapping(skb);
 358        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 359
 360        if (WARN_ON(!info->control.vif)) {
 361                kfree_skb(skb);
 362                return;
 363        }
 364
 365        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 366        __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 367        __skb_queue_tail(&local->pending[queue], skb);
 368        __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 369        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 370}
 371
 372void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 373                                   struct sk_buff_head *skbs,
 374                                   void (*fn)(void *data), void *data)
 375{
 376        struct ieee80211_hw *hw = &local->hw;
 377        struct sk_buff *skb;
 378        unsigned long flags;
 379        int queue, i;
 380
 381        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 382        for (i = 0; i < hw->queues; i++)
 383                __ieee80211_stop_queue(hw, i,
 384                        IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 385
 386        while ((skb = skb_dequeue(skbs))) {
 387                struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 388
 389                if (WARN_ON(!info->control.vif)) {
 390                        kfree_skb(skb);
 391                        continue;
 392                }
 393
 394                queue = skb_get_queue_mapping(skb);
 395                __skb_queue_tail(&local->pending[queue], skb);
 396        }
 397
 398        if (fn)
 399                fn(data);
 400
 401        for (i = 0; i < hw->queues; i++)
 402                __ieee80211_wake_queue(hw, i,
 403                        IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 404        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 405}
 406
 407void ieee80211_add_pending_skbs(struct ieee80211_local *local,
 408                                struct sk_buff_head *skbs)
 409{
 410        ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
 411}
 412
 413void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 414                                    enum queue_stop_reason reason)
 415{
 416        struct ieee80211_local *local = hw_to_local(hw);
 417        unsigned long flags;
 418        int i;
 419
 420        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 421
 422        for (i = 0; i < hw->queues; i++)
 423                __ieee80211_stop_queue(hw, i, reason);
 424
 425        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 426}
 427
 428void ieee80211_stop_queues(struct ieee80211_hw *hw)
 429{
 430        ieee80211_stop_queues_by_reason(hw,
 431                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 432}
 433EXPORT_SYMBOL(ieee80211_stop_queues);
 434
 435int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 436{
 437        struct ieee80211_local *local = hw_to_local(hw);
 438        unsigned long flags;
 439        int ret;
 440
 441        if (WARN_ON(queue >= hw->queues))
 442                return true;
 443
 444        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 445        ret = !!local->queue_stop_reasons[queue];
 446        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 447        return ret;
 448}
 449EXPORT_SYMBOL(ieee80211_queue_stopped);
 450
 451void ieee80211_wake_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_wake_queue(hw, i, reason);
 462
 463        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 464}
 465
 466void ieee80211_wake_queues(struct ieee80211_hw *hw)
 467{
 468        ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 469}
 470EXPORT_SYMBOL(ieee80211_wake_queues);
 471
 472void ieee80211_iterate_active_interfaces(
 473        struct ieee80211_hw *hw,
 474        void (*iterator)(void *data, u8 *mac,
 475                         struct ieee80211_vif *vif),
 476        void *data)
 477{
 478        struct ieee80211_local *local = hw_to_local(hw);
 479        struct ieee80211_sub_if_data *sdata;
 480
 481        mutex_lock(&local->iflist_mtx);
 482
 483        list_for_each_entry(sdata, &local->interfaces, list) {
 484                switch (sdata->vif.type) {
 485                case NL80211_IFTYPE_MONITOR:
 486                case NL80211_IFTYPE_AP_VLAN:
 487                        continue;
 488                default:
 489                        break;
 490                }
 491                if (ieee80211_sdata_running(sdata))
 492                        iterator(data, sdata->vif.addr,
 493                                 &sdata->vif);
 494        }
 495
 496        mutex_unlock(&local->iflist_mtx);
 497}
 498EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 499
 500void ieee80211_iterate_active_interfaces_atomic(
 501        struct ieee80211_hw *hw,
 502        void (*iterator)(void *data, u8 *mac,
 503                         struct ieee80211_vif *vif),
 504        void *data)
 505{
 506        struct ieee80211_local *local = hw_to_local(hw);
 507        struct ieee80211_sub_if_data *sdata;
 508
 509        rcu_read_lock();
 510
 511        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 512                switch (sdata->vif.type) {
 513                case NL80211_IFTYPE_MONITOR:
 514                case NL80211_IFTYPE_AP_VLAN:
 515                        continue;
 516                default:
 517                        break;
 518                }
 519                if (ieee80211_sdata_running(sdata))
 520                        iterator(data, sdata->vif.addr,
 521                                 &sdata->vif);
 522        }
 523
 524        rcu_read_unlock();
 525}
 526EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 527
 528/*
 529 * Nothing should have been stuffed into the workqueue during
 530 * the suspend->resume cycle. If this WARN is seen then there
 531 * is a bug with either the driver suspend or something in
 532 * mac80211 stuffing into the workqueue which we haven't yet
 533 * cleared during mac80211's suspend cycle.
 534 */
 535static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 536{
 537        if (WARN(local->suspended && !local->resuming,
 538                 "queueing ieee80211 work while going to suspend\n"))
 539                return false;
 540
 541        return true;
 542}
 543
 544void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 545{
 546        struct ieee80211_local *local = hw_to_local(hw);
 547
 548        if (!ieee80211_can_queue_work(local))
 549                return;
 550
 551        queue_work(local->workqueue, work);
 552}
 553EXPORT_SYMBOL(ieee80211_queue_work);
 554
 555void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 556                                  struct delayed_work *dwork,
 557                                  unsigned long delay)
 558{
 559        struct ieee80211_local *local = hw_to_local(hw);
 560
 561        if (!ieee80211_can_queue_work(local))
 562                return;
 563
 564        queue_delayed_work(local->workqueue, dwork, delay);
 565}
 566EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 567
 568u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 569                               struct ieee802_11_elems *elems,
 570                               u64 filter, u32 crc)
 571{
 572        size_t left = len;
 573        u8 *pos = start;
 574        bool calc_crc = filter != 0;
 575
 576        memset(elems, 0, sizeof(*elems));
 577        elems->ie_start = start;
 578        elems->total_len = len;
 579
 580        while (left >= 2) {
 581                u8 id, elen;
 582
 583                id = *pos++;
 584                elen = *pos++;
 585                left -= 2;
 586
 587                if (elen > left)
 588                        break;
 589
 590                if (calc_crc && id < 64 && (filter & (1ULL << id)))
 591                        crc = crc32_be(crc, pos - 2, elen + 2);
 592
 593                switch (id) {
 594                case WLAN_EID_SSID:
 595                        elems->ssid = pos;
 596                        elems->ssid_len = elen;
 597                        break;
 598                case WLAN_EID_SUPP_RATES:
 599                        elems->supp_rates = pos;
 600                        elems->supp_rates_len = elen;
 601                        break;
 602                case WLAN_EID_FH_PARAMS:
 603                        elems->fh_params = pos;
 604                        elems->fh_params_len = elen;
 605                        break;
 606                case WLAN_EID_DS_PARAMS:
 607                        elems->ds_params = pos;
 608                        elems->ds_params_len = elen;
 609                        break;
 610                case WLAN_EID_CF_PARAMS:
 611                        elems->cf_params = pos;
 612                        elems->cf_params_len = elen;
 613                        break;
 614                case WLAN_EID_TIM:
 615                        if (elen >= sizeof(struct ieee80211_tim_ie)) {
 616                                elems->tim = (void *)pos;
 617                                elems->tim_len = elen;
 618                        }
 619                        break;
 620                case WLAN_EID_IBSS_PARAMS:
 621                        elems->ibss_params = pos;
 622                        elems->ibss_params_len = elen;
 623                        break;
 624                case WLAN_EID_CHALLENGE:
 625                        elems->challenge = pos;
 626                        elems->challenge_len = elen;
 627                        break;
 628                case WLAN_EID_VENDOR_SPECIFIC:
 629                        if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 630                            pos[2] == 0xf2) {
 631                                /* Microsoft OUI (00:50:F2) */
 632
 633                                if (calc_crc)
 634                                        crc = crc32_be(crc, pos - 2, elen + 2);
 635
 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                                        /* OUI Type 2 - WMM IE */
 642                                        if (pos[4] == 0) {
 643                                                elems->wmm_info = pos;
 644                                                elems->wmm_info_len = elen;
 645                                        } else if (pos[4] == 1) {
 646                                                elems->wmm_param = pos;
 647                                                elems->wmm_param_len = elen;
 648                                        }
 649                                }
 650                        }
 651                        break;
 652                case WLAN_EID_RSN:
 653                        elems->rsn = pos;
 654                        elems->rsn_len = elen;
 655                        break;
 656                case WLAN_EID_ERP_INFO:
 657                        elems->erp_info = pos;
 658                        elems->erp_info_len = elen;
 659                        break;
 660                case WLAN_EID_EXT_SUPP_RATES:
 661                        elems->ext_supp_rates = pos;
 662                        elems->ext_supp_rates_len = elen;
 663                        break;
 664                case WLAN_EID_HT_CAPABILITY:
 665                        if (elen >= sizeof(struct ieee80211_ht_cap))
 666                                elems->ht_cap_elem = (void *)pos;
 667                        break;
 668                case WLAN_EID_HT_INFORMATION:
 669                        if (elen >= sizeof(struct ieee80211_ht_info))
 670                                elems->ht_info_elem = (void *)pos;
 671                        break;
 672                case WLAN_EID_MESH_ID:
 673                        elems->mesh_id = pos;
 674                        elems->mesh_id_len = elen;
 675                        break;
 676                case WLAN_EID_MESH_CONFIG:
 677                        if (elen >= sizeof(struct ieee80211_meshconf_ie))
 678                                elems->mesh_config = (void *)pos;
 679                        break;
 680                case WLAN_EID_PEER_MGMT:
 681                        elems->peering = pos;
 682                        elems->peering_len = elen;
 683                        break;
 684                case WLAN_EID_PREQ:
 685                        elems->preq = pos;
 686                        elems->preq_len = elen;
 687                        break;
 688                case WLAN_EID_PREP:
 689                        elems->prep = pos;
 690                        elems->prep_len = elen;
 691                        break;
 692                case WLAN_EID_PERR:
 693                        elems->perr = pos;
 694                        elems->perr_len = elen;
 695                        break;
 696                case WLAN_EID_RANN:
 697                        if (elen >= sizeof(struct ieee80211_rann_ie))
 698                                elems->rann = (void *)pos;
 699                        break;
 700                case WLAN_EID_CHANNEL_SWITCH:
 701                        elems->ch_switch_elem = pos;
 702                        elems->ch_switch_elem_len = elen;
 703                        break;
 704                case WLAN_EID_QUIET:
 705                        if (!elems->quiet_elem) {
 706                                elems->quiet_elem = pos;
 707                                elems->quiet_elem_len = elen;
 708                        }
 709                        elems->num_of_quiet_elem++;
 710                        break;
 711                case WLAN_EID_COUNTRY:
 712                        elems->country_elem = pos;
 713                        elems->country_elem_len = elen;
 714                        break;
 715                case WLAN_EID_PWR_CONSTRAINT:
 716                        elems->pwr_constr_elem = pos;
 717                        elems->pwr_constr_elem_len = elen;
 718                        break;
 719                case WLAN_EID_TIMEOUT_INTERVAL:
 720                        elems->timeout_int = pos;
 721                        elems->timeout_int_len = elen;
 722                        break;
 723                default:
 724                        break;
 725                }
 726
 727                left -= elen;
 728                pos += elen;
 729        }
 730
 731        return crc;
 732}
 733
 734void ieee802_11_parse_elems(u8 *start, size_t len,
 735                            struct ieee802_11_elems *elems)
 736{
 737        ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 738}
 739
 740void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 741{
 742        struct ieee80211_local *local = sdata->local;
 743        struct ieee80211_tx_queue_params qparam;
 744        int queue;
 745        bool use_11b;
 746        int aCWmin, aCWmax;
 747
 748        if (!local->ops->conf_tx)
 749                return;
 750
 751        memset(&qparam, 0, sizeof(qparam));
 752
 753        use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 754                 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 755
 756        for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
 757                /* Set defaults according to 802.11-2007 Table 7-37 */
 758                aCWmax = 1023;
 759                if (use_11b)
 760                        aCWmin = 31;
 761                else
 762                        aCWmin = 15;
 763
 764                switch (queue) {
 765                case 3: /* AC_BK */
 766                        qparam.cw_max = aCWmax;
 767                        qparam.cw_min = aCWmin;
 768                        qparam.txop = 0;
 769                        qparam.aifs = 7;
 770                        break;
 771                default: /* never happens but let's not leave undefined */
 772                case 2: /* AC_BE */
 773                        qparam.cw_max = aCWmax;
 774                        qparam.cw_min = aCWmin;
 775                        qparam.txop = 0;
 776                        qparam.aifs = 3;
 777                        break;
 778                case 1: /* AC_VI */
 779                        qparam.cw_max = aCWmin;
 780                        qparam.cw_min = (aCWmin + 1) / 2 - 1;
 781                        if (use_11b)
 782                                qparam.txop = 6016/32;
 783                        else
 784                                qparam.txop = 3008/32;
 785                        qparam.aifs = 2;
 786                        break;
 787                case 0: /* AC_VO */
 788                        qparam.cw_max = (aCWmin + 1) / 2 - 1;
 789                        qparam.cw_min = (aCWmin + 1) / 4 - 1;
 790                        if (use_11b)
 791                                qparam.txop = 3264/32;
 792                        else
 793                                qparam.txop = 1504/32;
 794                        qparam.aifs = 2;
 795                        break;
 796                }
 797
 798                qparam.uapsd = false;
 799
 800                sdata->tx_conf[queue] = qparam;
 801                drv_conf_tx(local, sdata, queue, &qparam);
 802        }
 803
 804        /* after reinitialize QoS TX queues setting to default,
 805         * disable QoS at all */
 806
 807        if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 808                sdata->vif.bss_conf.qos =
 809                        sdata->vif.type != NL80211_IFTYPE_STATION;
 810                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
 811        }
 812}
 813
 814void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 815                                  const size_t supp_rates_len,
 816                                  const u8 *supp_rates)
 817{
 818        struct ieee80211_local *local = sdata->local;
 819        int i, have_higher_than_11mbit = 0;
 820
 821        /* cf. IEEE 802.11 9.2.12 */
 822        for (i = 0; i < supp_rates_len; i++)
 823                if ((supp_rates[i] & 0x7f) * 5 > 110)
 824                        have_higher_than_11mbit = 1;
 825
 826        if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 827            have_higher_than_11mbit)
 828                sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 829        else
 830                sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 831
 832        ieee80211_set_wmm_default(sdata);
 833}
 834
 835u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 836                              enum ieee80211_band band)
 837{
 838        struct ieee80211_supported_band *sband;
 839        struct ieee80211_rate *bitrates;
 840        u32 mandatory_rates;
 841        enum ieee80211_rate_flags mandatory_flag;
 842        int i;
 843
 844        sband = local->hw.wiphy->bands[band];
 845        if (!sband) {
 846                WARN_ON(1);
 847                sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 848        }
 849
 850        if (band == IEEE80211_BAND_2GHZ)
 851                mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 852        else
 853                mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 854
 855        bitrates = sband->bitrates;
 856        mandatory_rates = 0;
 857        for (i = 0; i < sband->n_bitrates; i++)
 858                if (bitrates[i].flags & mandatory_flag)
 859                        mandatory_rates |= BIT(i);
 860        return mandatory_rates;
 861}
 862
 863void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 864                         u16 transaction, u16 auth_alg,
 865                         u8 *extra, size_t extra_len, const u8 *bssid,
 866                         const u8 *key, u8 key_len, u8 key_idx)
 867{
 868        struct ieee80211_local *local = sdata->local;
 869        struct sk_buff *skb;
 870        struct ieee80211_mgmt *mgmt;
 871        int err;
 872
 873        skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 874                            sizeof(*mgmt) + 6 + extra_len);
 875        if (!skb)
 876                return;
 877
 878        skb_reserve(skb, local->hw.extra_tx_headroom);
 879
 880        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 881        memset(mgmt, 0, 24 + 6);
 882        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 883                                          IEEE80211_STYPE_AUTH);
 884        memcpy(mgmt->da, bssid, ETH_ALEN);
 885        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 886        memcpy(mgmt->bssid, bssid, ETH_ALEN);
 887        mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 888        mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 889        mgmt->u.auth.status_code = cpu_to_le16(0);
 890        if (extra)
 891                memcpy(skb_put(skb, extra_len), extra, extra_len);
 892
 893        if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 894                mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 895                err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 896                WARN_ON(err);
 897        }
 898
 899        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 900        ieee80211_tx_skb(sdata, skb);
 901}
 902
 903int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 904                             const u8 *ie, size_t ie_len,
 905                             enum ieee80211_band band, u32 rate_mask,
 906                             u8 channel)
 907{
 908        struct ieee80211_supported_band *sband;
 909        u8 *pos;
 910        size_t offset = 0, noffset;
 911        int supp_rates_len, i;
 912        u8 rates[32];
 913        int num_rates;
 914        int ext_rates_len;
 915
 916        sband = local->hw.wiphy->bands[band];
 917
 918        pos = buffer;
 919
 920        num_rates = 0;
 921        for (i = 0; i < sband->n_bitrates; i++) {
 922                if ((BIT(i) & rate_mask) == 0)
 923                        continue; /* skip rate */
 924                rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
 925        }
 926
 927        supp_rates_len = min_t(int, num_rates, 8);
 928
 929        *pos++ = WLAN_EID_SUPP_RATES;
 930        *pos++ = supp_rates_len;
 931        memcpy(pos, rates, supp_rates_len);
 932        pos += supp_rates_len;
 933
 934        /* insert "request information" if in custom IEs */
 935        if (ie && ie_len) {
 936                static const u8 before_extrates[] = {
 937                        WLAN_EID_SSID,
 938                        WLAN_EID_SUPP_RATES,
 939                        WLAN_EID_REQUEST,
 940                };
 941                noffset = ieee80211_ie_split(ie, ie_len,
 942                                             before_extrates,
 943                                             ARRAY_SIZE(before_extrates),
 944                                             offset);
 945                memcpy(pos, ie + offset, noffset - offset);
 946                pos += noffset - offset;
 947                offset = noffset;
 948        }
 949
 950        ext_rates_len = num_rates - supp_rates_len;
 951        if (ext_rates_len > 0) {
 952                *pos++ = WLAN_EID_EXT_SUPP_RATES;
 953                *pos++ = ext_rates_len;
 954                memcpy(pos, rates + supp_rates_len, ext_rates_len);
 955                pos += ext_rates_len;
 956        }
 957
 958        if (channel && sband->band == IEEE80211_BAND_2GHZ) {
 959                *pos++ = WLAN_EID_DS_PARAMS;
 960                *pos++ = 1;
 961                *pos++ = channel;
 962        }
 963
 964        /* insert custom IEs that go before HT */
 965        if (ie && ie_len) {
 966                static const u8 before_ht[] = {
 967                        WLAN_EID_SSID,
 968                        WLAN_EID_SUPP_RATES,
 969                        WLAN_EID_REQUEST,
 970                        WLAN_EID_EXT_SUPP_RATES,
 971                        WLAN_EID_DS_PARAMS,
 972                        WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 973                };
 974                noffset = ieee80211_ie_split(ie, ie_len,
 975                                             before_ht, ARRAY_SIZE(before_ht),
 976                                             offset);
 977                memcpy(pos, ie + offset, noffset - offset);
 978                pos += noffset - offset;
 979                offset = noffset;
 980        }
 981
 982        if (sband->ht_cap.ht_supported)
 983                pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
 984                                                sband->ht_cap.cap);
 985
 986        /*
 987         * If adding more here, adjust code in main.c
 988         * that calculates local->scan_ies_len.
 989         */
 990
 991        /* add any remaining custom IEs */
 992        if (ie && ie_len) {
 993                noffset = ie_len;
 994                memcpy(pos, ie + offset, noffset - offset);
 995                pos += noffset - offset;
 996        }
 997
 998        return pos - buffer;
 999}
1000
1001struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1002                                          u8 *dst, u32 ratemask,
1003                                          const u8 *ssid, size_t ssid_len,
1004                                          const u8 *ie, size_t ie_len,
1005                                          bool directed)
1006{
1007        struct ieee80211_local *local = sdata->local;
1008        struct sk_buff *skb;
1009        struct ieee80211_mgmt *mgmt;
1010        size_t buf_len;
1011        u8 *buf;
1012        u8 chan;
1013
1014        /* FIXME: come up with a proper value */
1015        buf = kmalloc(200 + ie_len, GFP_KERNEL);
1016        if (!buf)
1017                return NULL;
1018
1019        /*
1020         * Do not send DS Channel parameter for directed probe requests
1021         * in order to maximize the chance that we get a response.  Some
1022         * badly-behaved APs don't respond when this parameter is included.
1023         */
1024        if (directed)
1025                chan = 0;
1026        else
1027                chan = ieee80211_frequency_to_channel(
1028                        local->hw.conf.channel->center_freq);
1029
1030        buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1031                                           local->hw.conf.channel->band,
1032                                           ratemask, chan);
1033
1034        skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1035                                     ssid, ssid_len,
1036                                     buf, buf_len);
1037        if (!skb)
1038                goto out;
1039
1040        if (dst) {
1041                mgmt = (struct ieee80211_mgmt *) skb->data;
1042                memcpy(mgmt->da, dst, ETH_ALEN);
1043                memcpy(mgmt->bssid, dst, ETH_ALEN);
1044        }
1045
1046        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1047
1048 out:
1049        kfree(buf);
1050
1051        return skb;
1052}
1053
1054void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1055                              const u8 *ssid, size_t ssid_len,
1056                              const u8 *ie, size_t ie_len,
1057                              u32 ratemask, bool directed, bool no_cck)
1058{
1059        struct sk_buff *skb;
1060
1061        skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1062                                        ie, ie_len, directed);
1063        if (skb) {
1064                if (no_cck)
1065                        IEEE80211_SKB_CB(skb)->flags |=
1066                                IEEE80211_TX_CTL_NO_CCK_RATE;
1067                ieee80211_tx_skb(sdata, skb);
1068        }
1069}
1070
1071u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1072                            struct ieee802_11_elems *elems,
1073                            enum ieee80211_band band)
1074{
1075        struct ieee80211_supported_band *sband;
1076        struct ieee80211_rate *bitrates;
1077        size_t num_rates;
1078        u32 supp_rates;
1079        int i, j;
1080        sband = local->hw.wiphy->bands[band];
1081
1082        if (!sband) {
1083                WARN_ON(1);
1084                sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1085        }
1086
1087        bitrates = sband->bitrates;
1088        num_rates = sband->n_bitrates;
1089        supp_rates = 0;
1090        for (i = 0; i < elems->supp_rates_len +
1091                     elems->ext_supp_rates_len; i++) {
1092                u8 rate = 0;
1093                int own_rate;
1094                if (i < elems->supp_rates_len)
1095                        rate = elems->supp_rates[i];
1096                else if (elems->ext_supp_rates)
1097                        rate = elems->ext_supp_rates
1098                                [i - elems->supp_rates_len];
1099                own_rate = 5 * (rate & 0x7f);
1100                for (j = 0; j < num_rates; j++)
1101                        if (bitrates[j].bitrate == own_rate)
1102                                supp_rates |= BIT(j);
1103        }
1104        return supp_rates;
1105}
1106
1107void ieee80211_stop_device(struct ieee80211_local *local)
1108{
1109        ieee80211_led_radio(local, false);
1110        ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1111
1112        cancel_work_sync(&local->reconfig_filter);
1113
1114        flush_workqueue(local->workqueue);
1115        drv_stop(local);
1116}
1117
1118int ieee80211_reconfig(struct ieee80211_local *local)
1119{
1120        struct ieee80211_hw *hw = &local->hw;
1121        struct ieee80211_sub_if_data *sdata;
1122        struct sta_info *sta;
1123        int res, i;
1124
1125#ifdef CONFIG_PM
1126        if (local->suspended)
1127                local->resuming = true;
1128
1129        if (local->wowlan) {
1130                local->wowlan = false;
1131                res = drv_resume(local);
1132                if (res < 0) {
1133                        local->resuming = false;
1134                        return res;
1135                }
1136                if (res == 0)
1137                        goto wake_up;
1138                WARN_ON(res > 1);
1139                /*
1140                 * res is 1, which means the driver requested
1141                 * to go through a regular reset on wakeup.
1142                 */
1143        }
1144#endif
1145        /* everything else happens only if HW was up & running */
1146        if (!local->open_count)
1147                goto wake_up;
1148
1149        /*
1150         * Upon resume hardware can sometimes be goofy due to
1151         * various platform / driver / bus issues, so restarting
1152         * the device may at times not work immediately. Propagate
1153         * the error.
1154         */
1155        res = drv_start(local);
1156        if (res) {
1157                WARN(local->suspended, "Hardware became unavailable "
1158                     "upon resume. This could be a software issue "
1159                     "prior to suspend or a hardware issue.\n");
1160                return res;
1161        }
1162
1163        /* setup fragmentation threshold */
1164        drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1165
1166        /* setup RTS threshold */
1167        drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1168
1169        /* reset coverage class */
1170        drv_set_coverage_class(local, hw->wiphy->coverage_class);
1171
1172        ieee80211_led_radio(local, true);
1173        ieee80211_mod_tpt_led_trig(local,
1174                                   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1175
1176        /* add interfaces */
1177        list_for_each_entry(sdata, &local->interfaces, list) {
1178                if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1179                    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1180                    ieee80211_sdata_running(sdata))
1181                        res = drv_add_interface(local, sdata);
1182        }
1183
1184        /* add STAs back */
1185        mutex_lock(&local->sta_mtx);
1186        list_for_each_entry(sta, &local->sta_list, list) {
1187                if (sta->uploaded) {
1188                        sdata = sta->sdata;
1189                        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1190                                sdata = container_of(sdata->bss,
1191                                             struct ieee80211_sub_if_data,
1192                                             u.ap);
1193
1194                        WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1195                }
1196        }
1197        mutex_unlock(&local->sta_mtx);
1198
1199        /* reconfigure tx conf */
1200        list_for_each_entry(sdata, &local->interfaces, list) {
1201                if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1202                    sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1203                    !ieee80211_sdata_running(sdata))
1204                        continue;
1205
1206                for (i = 0; i < hw->queues; i++)
1207                        drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1208        }
1209
1210        /* reconfigure hardware */
1211        ieee80211_hw_config(local, ~0);
1212
1213        ieee80211_configure_filter(local);
1214
1215        /* Finally also reconfigure all the BSS information */
1216        list_for_each_entry(sdata, &local->interfaces, list) {
1217                u32 changed;
1218
1219                if (!ieee80211_sdata_running(sdata))
1220                        continue;
1221
1222                /* common change flags for all interface types */
1223                changed = BSS_CHANGED_ERP_CTS_PROT |
1224                          BSS_CHANGED_ERP_PREAMBLE |
1225                          BSS_CHANGED_ERP_SLOT |
1226                          BSS_CHANGED_HT |
1227                          BSS_CHANGED_BASIC_RATES |
1228                          BSS_CHANGED_BEACON_INT |
1229                          BSS_CHANGED_BSSID |
1230                          BSS_CHANGED_CQM |
1231                          BSS_CHANGED_QOS |
1232                          BSS_CHANGED_IDLE;
1233
1234                switch (sdata->vif.type) {
1235                case NL80211_IFTYPE_STATION:
1236                        changed |= BSS_CHANGED_ASSOC |
1237                                   BSS_CHANGED_ARP_FILTER;
1238                        mutex_lock(&sdata->u.mgd.mtx);
1239                        ieee80211_bss_info_change_notify(sdata, changed);
1240                        mutex_unlock(&sdata->u.mgd.mtx);
1241                        break;
1242                case NL80211_IFTYPE_ADHOC:
1243                        changed |= BSS_CHANGED_IBSS;
1244                        /* fall through */
1245                case NL80211_IFTYPE_AP:
1246                        changed |= BSS_CHANGED_SSID;
1247
1248                        if (sdata->vif.type == NL80211_IFTYPE_AP)
1249                                changed |= BSS_CHANGED_AP_PROBE_RESP;
1250
1251                        /* fall through */
1252                case NL80211_IFTYPE_MESH_POINT:
1253                        changed |= BSS_CHANGED_BEACON |
1254                                   BSS_CHANGED_BEACON_ENABLED;
1255                        ieee80211_bss_info_change_notify(sdata, changed);
1256                        break;
1257                case NL80211_IFTYPE_WDS:
1258                        break;
1259                case NL80211_IFTYPE_AP_VLAN:
1260                case NL80211_IFTYPE_MONITOR:
1261                        /* ignore virtual */
1262                        break;
1263                case NL80211_IFTYPE_UNSPECIFIED:
1264                case NUM_NL80211_IFTYPES:
1265                case NL80211_IFTYPE_P2P_CLIENT:
1266                case NL80211_IFTYPE_P2P_GO:
1267                        WARN_ON(1);
1268                        break;
1269                }
1270        }
1271
1272        ieee80211_recalc_ps(local, -1);
1273
1274        /*
1275         * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1276         * sessions can be established after a resume.
1277         *
1278         * Also tear down aggregation sessions since reconfiguring
1279         * them in a hardware restart scenario is not easily done
1280         * right now, and the hardware will have lost information
1281         * about the sessions, but we and the AP still think they
1282         * are active. This is really a workaround though.
1283         */
1284        if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1285                mutex_lock(&local->sta_mtx);
1286
1287                list_for_each_entry(sta, &local->sta_list, list) {
1288                        ieee80211_sta_tear_down_BA_sessions(sta, true);
1289                        clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1290                }
1291
1292                mutex_unlock(&local->sta_mtx);
1293        }
1294
1295        /* add back keys */
1296        list_for_each_entry(sdata, &local->interfaces, list)
1297                if (ieee80211_sdata_running(sdata))
1298                        ieee80211_enable_keys(sdata);
1299
1300 wake_up:
1301        ieee80211_wake_queues_by_reason(hw,
1302                        IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1303
1304        /*
1305         * If this is for hw restart things are still running.
1306         * We may want to change that later, however.
1307         */
1308        if (!local->suspended)
1309                return 0;
1310
1311#ifdef CONFIG_PM
1312        /* first set suspended false, then resuming */
1313        local->suspended = false;
1314        mb();
1315        local->resuming = false;
1316
1317        list_for_each_entry(sdata, &local->interfaces, list) {
1318                switch(sdata->vif.type) {
1319                case NL80211_IFTYPE_STATION:
1320                        ieee80211_sta_restart(sdata);
1321                        break;
1322                case NL80211_IFTYPE_ADHOC:
1323                        ieee80211_ibss_restart(sdata);
1324                        break;
1325                case NL80211_IFTYPE_MESH_POINT:
1326                        ieee80211_mesh_restart(sdata);
1327                        break;
1328                default:
1329                        break;
1330                }
1331        }
1332
1333        mod_timer(&local->sta_cleanup, jiffies + 1);
1334
1335        mutex_lock(&local->sta_mtx);
1336        list_for_each_entry(sta, &local->sta_list, list)
1337                mesh_plink_restart(sta);
1338        mutex_unlock(&local->sta_mtx);
1339#else
1340        WARN_ON(1);
1341#endif
1342        return 0;
1343}
1344
1345void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1346{
1347        struct ieee80211_sub_if_data *sdata;
1348        struct ieee80211_local *local;
1349        struct ieee80211_key *key;
1350
1351        if (WARN_ON(!vif))
1352                return;
1353
1354        sdata = vif_to_sdata(vif);
1355        local = sdata->local;
1356
1357        if (WARN_ON(!local->resuming))
1358                return;
1359
1360        if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1361                return;
1362
1363        sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1364
1365        mutex_lock(&local->key_mtx);
1366        list_for_each_entry(key, &sdata->key_list, list)
1367                key->flags |= KEY_FLAG_TAINTED;
1368        mutex_unlock(&local->key_mtx);
1369}
1370EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1371
1372static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1373                          enum ieee80211_smps_mode *smps_mode)
1374{
1375        if (ifmgd->associated) {
1376                *smps_mode = ifmgd->ap_smps;
1377
1378                if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1379                        if (ifmgd->powersave)
1380                                *smps_mode = IEEE80211_SMPS_DYNAMIC;
1381                        else
1382                                *smps_mode = IEEE80211_SMPS_OFF;
1383                }
1384
1385                return 1;
1386        }
1387
1388        return 0;
1389}
1390
1391/* must hold iflist_mtx */
1392void ieee80211_recalc_smps(struct ieee80211_local *local)
1393{
1394        struct ieee80211_sub_if_data *sdata;
1395        enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1396        int count = 0;
1397
1398        lockdep_assert_held(&local->iflist_mtx);
1399
1400        /*
1401         * This function could be improved to handle multiple
1402         * interfaces better, but right now it makes any
1403         * non-station interfaces force SM PS to be turned
1404         * off. If there are multiple station interfaces it
1405         * could also use the best possible mode, e.g. if
1406         * one is in static and the other in dynamic then
1407         * dynamic is ok.
1408         */
1409
1410        list_for_each_entry(sdata, &local->interfaces, list) {
1411                if (!ieee80211_sdata_running(sdata))
1412                        continue;
1413                if (sdata->vif.type != NL80211_IFTYPE_STATION)
1414                        goto set;
1415
1416                count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1417
1418                if (count > 1) {
1419                        smps_mode = IEEE80211_SMPS_OFF;
1420                        break;
1421                }
1422        }
1423
1424        if (smps_mode == local->smps_mode)
1425                return;
1426
1427 set:
1428        local->smps_mode = smps_mode;
1429        /* changed flag is auto-detected for this */
1430        ieee80211_hw_config(local, 0);
1431}
1432
1433static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1434{
1435        int i;
1436
1437        for (i = 0; i < n_ids; i++)
1438                if (ids[i] == id)
1439                        return true;
1440        return false;
1441}
1442
1443/**
1444 * ieee80211_ie_split - split an IE buffer according to ordering
1445 *
1446 * @ies: the IE buffer
1447 * @ielen: the length of the IE buffer
1448 * @ids: an array with element IDs that are allowed before
1449 *      the split
1450 * @n_ids: the size of the element ID array
1451 * @offset: offset where to start splitting in the buffer
1452 *
1453 * This function splits an IE buffer by updating the @offset
1454 * variable to point to the location where the buffer should be
1455 * split.
1456 *
1457 * It assumes that the given IE buffer is well-formed, this
1458 * has to be guaranteed by the caller!
1459 *
1460 * It also assumes that the IEs in the buffer are ordered
1461 * correctly, if not the result of using this function will not
1462 * be ordered correctly either, i.e. it does no reordering.
1463 *
1464 * The function returns the offset where the next part of the
1465 * buffer starts, which may be @ielen if the entire (remainder)
1466 * of the buffer should be used.
1467 */
1468size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1469                          const u8 *ids, int n_ids, size_t offset)
1470{
1471        size_t pos = offset;
1472
1473        while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1474                pos += 2 + ies[pos + 1];
1475
1476        return pos;
1477}
1478
1479size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1480{
1481        size_t pos = offset;
1482
1483        while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1484                pos += 2 + ies[pos + 1];
1485
1486        return pos;
1487}
1488
1489static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1490                                            int rssi_min_thold,
1491                                            int rssi_max_thold)
1492{
1493        trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1494
1495        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1496                return;
1497
1498        /*
1499         * Scale up threshold values before storing it, as the RSSI averaging
1500         * algorithm uses a scaled up value as well. Change this scaling
1501         * factor if the RSSI averaging algorithm changes.
1502         */
1503        sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1504        sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1505}
1506
1507void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1508                                    int rssi_min_thold,
1509                                    int rssi_max_thold)
1510{
1511        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1512
1513        WARN_ON(rssi_min_thold == rssi_max_thold ||
1514                rssi_min_thold > rssi_max_thold);
1515
1516        _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1517                                       rssi_max_thold);
1518}
1519EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1520
1521void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1522{
1523        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1524
1525        _ieee80211_enable_rssi_reports(sdata, 0, 0);
1526}
1527EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1528
1529u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1530                              u16 cap)
1531{
1532        __le16 tmp;
1533
1534        *pos++ = WLAN_EID_HT_CAPABILITY;
1535        *pos++ = sizeof(struct ieee80211_ht_cap);
1536        memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1537
1538        /* capability flags */
1539        tmp = cpu_to_le16(cap);
1540        memcpy(pos, &tmp, sizeof(u16));
1541        pos += sizeof(u16);
1542
1543        /* AMPDU parameters */
1544        *pos++ = ht_cap->ampdu_factor |
1545                 (ht_cap->ampdu_density <<
1546                        IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1547
1548        /* MCS set */
1549        memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1550        pos += sizeof(ht_cap->mcs);
1551
1552        /* extended capabilities */
1553        pos += sizeof(__le16);
1554
1555        /* BF capabilities */
1556        pos += sizeof(__le32);
1557
1558        /* antenna selection */
1559        pos += sizeof(u8);
1560
1561        return pos;
1562}
1563
1564u8 *ieee80211_ie_build_ht_info(u8 *pos,
1565                               struct ieee80211_sta_ht_cap *ht_cap,
1566                               struct ieee80211_channel *channel,
1567                               enum nl80211_channel_type channel_type)
1568{
1569        struct ieee80211_ht_info *ht_info;
1570        /* Build HT Information */
1571        *pos++ = WLAN_EID_HT_INFORMATION;
1572        *pos++ = sizeof(struct ieee80211_ht_info);
1573        ht_info = (struct ieee80211_ht_info *)pos;
1574        ht_info->control_chan =
1575                        ieee80211_frequency_to_channel(channel->center_freq);
1576        switch (channel_type) {
1577        case NL80211_CHAN_HT40MINUS:
1578                ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1579                break;
1580        case NL80211_CHAN_HT40PLUS:
1581                ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1582                break;
1583        case NL80211_CHAN_HT20:
1584        default:
1585                ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1586                break;
1587        }
1588        if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
1589                ht_info->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1590
1591        /*
1592         * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and
1593         * RIFS Mode are reserved in IBSS mode, therefore keep them at 0
1594         */
1595        ht_info->operation_mode = 0x0000;
1596        ht_info->stbc_param = 0x0000;
1597
1598        /* It seems that Basic MCS set and Supported MCS set
1599           are identical for the first 10 bytes */
1600        memset(&ht_info->basic_set, 0, 16);
1601        memcpy(&ht_info->basic_set, &ht_cap->mcs, 10);
1602
1603        return pos + sizeof(struct ieee80211_ht_info);
1604}
1605
1606enum nl80211_channel_type
1607ieee80211_ht_info_to_channel_type(struct ieee80211_ht_info *ht_info)
1608{
1609        enum nl80211_channel_type channel_type;
1610
1611        if (!ht_info)
1612                return NL80211_CHAN_NO_HT;
1613
1614        switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1615        case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1616                channel_type = NL80211_CHAN_HT20;
1617                break;
1618        case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1619                channel_type = NL80211_CHAN_HT40PLUS;
1620                break;
1621        case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1622                channel_type = NL80211_CHAN_HT40MINUS;
1623                break;
1624        default:
1625                channel_type = NL80211_CHAN_NO_HT;
1626        }
1627
1628        return channel_type;
1629}
1630
1631int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1632{
1633        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1634        struct ieee80211_local *local = sdata->local;
1635        struct ieee80211_supported_band *sband;
1636        int rate;
1637        u8 i, rates, *pos;
1638
1639        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1640        rates = sband->n_bitrates;
1641        if (rates > 8)
1642                rates = 8;
1643
1644        if (skb_tailroom(skb) < rates + 2)
1645                return -ENOMEM;
1646
1647        pos = skb_put(skb, rates + 2);
1648        *pos++ = WLAN_EID_SUPP_RATES;
1649        *pos++ = rates;
1650        for (i = 0; i < rates; i++) {
1651                rate = sband->bitrates[i].bitrate;
1652                *pos++ = (u8) (rate / 5);
1653        }
1654
1655        return 0;
1656}
1657
1658int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1659{
1660        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1661        struct ieee80211_local *local = sdata->local;
1662        struct ieee80211_supported_band *sband;
1663        int rate;
1664        u8 i, exrates, *pos;
1665
1666        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1667        exrates = sband->n_bitrates;
1668        if (exrates > 8)
1669                exrates -= 8;
1670        else
1671                exrates = 0;
1672
1673        if (skb_tailroom(skb) < exrates + 2)
1674                return -ENOMEM;
1675
1676        if (exrates) {
1677                pos = skb_put(skb, exrates + 2);
1678                *pos++ = WLAN_EID_EXT_SUPP_RATES;
1679                *pos++ = exrates;
1680                for (i = 8; i < sband->n_bitrates; i++) {
1681                        rate = sband->bitrates[i].bitrate;
1682                        *pos++ = (u8) (rate / 5);
1683                }
1684        }
1685        return 0;
1686}
1687
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