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(enum ieee80211_band band, 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 (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                                        enum ieee80211_band band,
 166                                        size_t frame_len,
 167                                        struct ieee80211_rate *rate)
 168{
 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(band, 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[frame_txctl->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(sband->band, 10, rate->bitrate,
 217                                       erp, short_preamble);
 218        /* Data frame duration */
 219        dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
 220                                        erp, short_preamble);
 221        /* ACK duration */
 222        dur += ieee80211_frame_duration(sband->band, 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[frame_txctl->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(sband->band, 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(sband->band, 10, rate->bitrate,
 261                                                erp, short_preamble);
 262        }
 263
 264        return cpu_to_le16(dur);
 265}
 266EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 267
 268void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
 269{
 270        struct ieee80211_sub_if_data *sdata;
 271        int n_acs = IEEE80211_NUM_ACS;
 272
 273        if (local->hw.queues < IEEE80211_NUM_ACS)
 274                n_acs = 1;
 275
 276        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 277                int ac;
 278
 279                if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
 280                        continue;
 281
 282                if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
 283                    local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
 284                        continue;
 285
 286                for (ac = 0; ac < n_acs; ac++) {
 287                        int ac_queue = sdata->vif.hw_queue[ac];
 288
 289                        if (ac_queue == queue ||
 290                            (sdata->vif.cab_queue == queue &&
 291                             local->queue_stop_reasons[ac_queue] == 0 &&
 292                             skb_queue_empty(&local->pending[ac_queue])))
 293                                netif_wake_subqueue(sdata->dev, ac);
 294                }
 295        }
 296}
 297
 298static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 299                                   enum queue_stop_reason reason)
 300{
 301        struct ieee80211_local *local = hw_to_local(hw);
 302
 303        trace_wake_queue(local, queue, reason);
 304
 305        if (WARN_ON(queue >= hw->queues))
 306                return;
 307
 308        if (!test_bit(reason, &local->queue_stop_reasons[queue]))
 309                return;
 310
 311        __clear_bit(reason, &local->queue_stop_reasons[queue]);
 312
 313        if (local->queue_stop_reasons[queue] != 0)
 314                /* someone still has this queue stopped */
 315                return;
 316
 317        if (skb_queue_empty(&local->pending[queue])) {
 318                rcu_read_lock();
 319                ieee80211_propagate_queue_wake(local, queue);
 320                rcu_read_unlock();
 321        } else
 322                tasklet_schedule(&local->tx_pending_tasklet);
 323}
 324
 325void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 326                                    enum queue_stop_reason reason)
 327{
 328        struct ieee80211_local *local = hw_to_local(hw);
 329        unsigned long flags;
 330
 331        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 332        __ieee80211_wake_queue(hw, queue, reason);
 333        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 334}
 335
 336void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 337{
 338        ieee80211_wake_queue_by_reason(hw, queue,
 339                                       IEEE80211_QUEUE_STOP_REASON_DRIVER);
 340}
 341EXPORT_SYMBOL(ieee80211_wake_queue);
 342
 343static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 344                                   enum queue_stop_reason reason)
 345{
 346        struct ieee80211_local *local = hw_to_local(hw);
 347        struct ieee80211_sub_if_data *sdata;
 348        int n_acs = IEEE80211_NUM_ACS;
 349
 350        trace_stop_queue(local, queue, reason);
 351
 352        if (WARN_ON(queue >= hw->queues))
 353                return;
 354
 355        if (test_bit(reason, &local->queue_stop_reasons[queue]))
 356                return;
 357
 358        __set_bit(reason, &local->queue_stop_reasons[queue]);
 359
 360        if (local->hw.queues < IEEE80211_NUM_ACS)
 361                n_acs = 1;
 362
 363        rcu_read_lock();
 364        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 365                int ac;
 366
 367                for (ac = 0; ac < n_acs; ac++) {
 368                        if (sdata->vif.hw_queue[ac] == queue ||
 369                            sdata->vif.cab_queue == queue)
 370                                netif_stop_subqueue(sdata->dev, ac);
 371                }
 372        }
 373        rcu_read_unlock();
 374}
 375
 376void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 377                                    enum queue_stop_reason reason)
 378{
 379        struct ieee80211_local *local = hw_to_local(hw);
 380        unsigned long flags;
 381
 382        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 383        __ieee80211_stop_queue(hw, queue, reason);
 384        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 385}
 386
 387void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 388{
 389        ieee80211_stop_queue_by_reason(hw, queue,
 390                                       IEEE80211_QUEUE_STOP_REASON_DRIVER);
 391}
 392EXPORT_SYMBOL(ieee80211_stop_queue);
 393
 394void ieee80211_add_pending_skb(struct ieee80211_local *local,
 395                               struct sk_buff *skb)
 396{
 397        struct ieee80211_hw *hw = &local->hw;
 398        unsigned long flags;
 399        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 400        int queue = info->hw_queue;
 401
 402        if (WARN_ON(!info->control.vif)) {
 403                ieee80211_free_txskb(&local->hw, skb);
 404                return;
 405        }
 406
 407        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 408        __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 409        __skb_queue_tail(&local->pending[queue], skb);
 410        __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 411        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 412}
 413
 414void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
 415                                   struct sk_buff_head *skbs,
 416                                   void (*fn)(void *data), void *data)
 417{
 418        struct ieee80211_hw *hw = &local->hw;
 419        struct sk_buff *skb;
 420        unsigned long flags;
 421        int queue, i;
 422
 423        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 424        while ((skb = skb_dequeue(skbs))) {
 425                struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 426
 427                if (WARN_ON(!info->control.vif)) {
 428                        ieee80211_free_txskb(&local->hw, skb);
 429                        continue;
 430                }
 431
 432                queue = info->hw_queue;
 433
 434                __ieee80211_stop_queue(hw, queue,
 435                                IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 436
 437                __skb_queue_tail(&local->pending[queue], skb);
 438        }
 439
 440        if (fn)
 441                fn(data);
 442
 443        for (i = 0; i < hw->queues; i++)
 444                __ieee80211_wake_queue(hw, i,
 445                        IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
 446        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 447}
 448
 449void ieee80211_stop_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_stop_queue(hw, i, reason);
 460
 461        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 462}
 463
 464void ieee80211_stop_queues(struct ieee80211_hw *hw)
 465{
 466        ieee80211_stop_queues_by_reason(hw,
 467                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 468}
 469EXPORT_SYMBOL(ieee80211_stop_queues);
 470
 471int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 472{
 473        struct ieee80211_local *local = hw_to_local(hw);
 474        unsigned long flags;
 475        int ret;
 476
 477        if (WARN_ON(queue >= hw->queues))
 478                return true;
 479
 480        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 481        ret = !!local->queue_stop_reasons[queue];
 482        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 483        return ret;
 484}
 485EXPORT_SYMBOL(ieee80211_queue_stopped);
 486
 487void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 488                                     enum queue_stop_reason reason)
 489{
 490        struct ieee80211_local *local = hw_to_local(hw);
 491        unsigned long flags;
 492        int i;
 493
 494        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 495
 496        for (i = 0; i < hw->queues; i++)
 497                __ieee80211_wake_queue(hw, i, reason);
 498
 499        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 500}
 501
 502void ieee80211_wake_queues(struct ieee80211_hw *hw)
 503{
 504        ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 505}
 506EXPORT_SYMBOL(ieee80211_wake_queues);
 507
 508void ieee80211_iterate_active_interfaces(
 509        struct ieee80211_hw *hw,
 510        void (*iterator)(void *data, u8 *mac,
 511                         struct ieee80211_vif *vif),
 512        void *data)
 513{
 514        struct ieee80211_local *local = hw_to_local(hw);
 515        struct ieee80211_sub_if_data *sdata;
 516
 517        mutex_lock(&local->iflist_mtx);
 518
 519        list_for_each_entry(sdata, &local->interfaces, list) {
 520                switch (sdata->vif.type) {
 521                case NL80211_IFTYPE_MONITOR:
 522                case NL80211_IFTYPE_AP_VLAN:
 523                        continue;
 524                default:
 525                        break;
 526                }
 527                if (ieee80211_sdata_running(sdata))
 528                        iterator(data, sdata->vif.addr,
 529                                 &sdata->vif);
 530        }
 531
 532        sdata = rcu_dereference_protected(local->monitor_sdata,
 533                                          lockdep_is_held(&local->iflist_mtx));
 534        if (sdata)
 535                iterator(data, sdata->vif.addr, &sdata->vif);
 536
 537        mutex_unlock(&local->iflist_mtx);
 538}
 539EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 540
 541void ieee80211_iterate_active_interfaces_atomic(
 542        struct ieee80211_hw *hw,
 543        void (*iterator)(void *data, u8 *mac,
 544                         struct ieee80211_vif *vif),
 545        void *data)
 546{
 547        struct ieee80211_local *local = hw_to_local(hw);
 548        struct ieee80211_sub_if_data *sdata;
 549
 550        rcu_read_lock();
 551
 552        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 553                switch (sdata->vif.type) {
 554                case NL80211_IFTYPE_MONITOR:
 555                case NL80211_IFTYPE_AP_VLAN:
 556                        continue;
 557                default:
 558                        break;
 559                }
 560                if (ieee80211_sdata_running(sdata))
 561                        iterator(data, sdata->vif.addr,
 562                                 &sdata->vif);
 563        }
 564
 565        sdata = rcu_dereference(local->monitor_sdata);
 566        if (sdata)
 567                iterator(data, sdata->vif.addr, &sdata->vif);
 568
 569        rcu_read_unlock();
 570}
 571EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 572
 573/*
 574 * Nothing should have been stuffed into the workqueue during
 575 * the suspend->resume cycle. If this WARN is seen then there
 576 * is a bug with either the driver suspend or something in
 577 * mac80211 stuffing into the workqueue which we haven't yet
 578 * cleared during mac80211's suspend cycle.
 579 */
 580static bool ieee80211_can_queue_work(struct ieee80211_local *local)
 581{
 582        if (WARN(local->suspended && !local->resuming,
 583                 "queueing ieee80211 work while going to suspend\n"))
 584                return false;
 585
 586        return true;
 587}
 588
 589void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
 590{
 591        struct ieee80211_local *local = hw_to_local(hw);
 592
 593        if (!ieee80211_can_queue_work(local))
 594                return;
 595
 596        queue_work(local->workqueue, work);
 597}
 598EXPORT_SYMBOL(ieee80211_queue_work);
 599
 600void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
 601                                  struct delayed_work *dwork,
 602                                  unsigned long delay)
 603{
 604        struct ieee80211_local *local = hw_to_local(hw);
 605
 606        if (!ieee80211_can_queue_work(local))
 607                return;
 608
 609        queue_delayed_work(local->workqueue, dwork, delay);
 610}
 611EXPORT_SYMBOL(ieee80211_queue_delayed_work);
 612
 613u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
 614                               struct ieee802_11_elems *elems,
 615                               u64 filter, u32 crc)
 616{
 617        size_t left = len;
 618        u8 *pos = start;
 619        bool calc_crc = filter != 0;
 620        DECLARE_BITMAP(seen_elems, 256);
 621
 622        bitmap_zero(seen_elems, 256);
 623        memset(elems, 0, sizeof(*elems));
 624        elems->ie_start = start;
 625        elems->total_len = len;
 626
 627        while (left >= 2) {
 628                u8 id, elen;
 629                bool elem_parse_failed;
 630
 631                id = *pos++;
 632                elen = *pos++;
 633                left -= 2;
 634
 635                if (elen > left) {
 636                        elems->parse_error = true;
 637                        break;
 638                }
 639
 640                if (id != WLAN_EID_VENDOR_SPECIFIC &&
 641                    id != WLAN_EID_QUIET &&
 642                    test_bit(id, seen_elems)) {
 643                        elems->parse_error = true;
 644                        left -= elen;
 645                        pos += elen;
 646                        continue;
 647                }
 648
 649                if (calc_crc && id < 64 && (filter & (1ULL << id)))
 650                        crc = crc32_be(crc, pos - 2, elen + 2);
 651
 652                elem_parse_failed = false;
 653
 654                switch (id) {
 655                case WLAN_EID_SSID:
 656                        elems->ssid = pos;
 657                        elems->ssid_len = elen;
 658                        break;
 659                case WLAN_EID_SUPP_RATES:
 660                        elems->supp_rates = pos;
 661                        elems->supp_rates_len = elen;
 662                        break;
 663                case WLAN_EID_FH_PARAMS:
 664                        elems->fh_params = pos;
 665                        elems->fh_params_len = elen;
 666                        break;
 667                case WLAN_EID_DS_PARAMS:
 668                        elems->ds_params = pos;
 669                        elems->ds_params_len = elen;
 670                        break;
 671                case WLAN_EID_CF_PARAMS:
 672                        elems->cf_params = pos;
 673                        elems->cf_params_len = elen;
 674                        break;
 675                case WLAN_EID_TIM:
 676                        if (elen >= sizeof(struct ieee80211_tim_ie)) {
 677                                elems->tim = (void *)pos;
 678                                elems->tim_len = elen;
 679                        } else
 680                                elem_parse_failed = true;
 681                        break;
 682                case WLAN_EID_IBSS_PARAMS:
 683                        elems->ibss_params = pos;
 684                        elems->ibss_params_len = elen;
 685                        break;
 686                case WLAN_EID_CHALLENGE:
 687                        elems->challenge = pos;
 688                        elems->challenge_len = elen;
 689                        break;
 690                case WLAN_EID_VENDOR_SPECIFIC:
 691                        if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 692                            pos[2] == 0xf2) {
 693                                /* Microsoft OUI (00:50:F2) */
 694
 695                                if (calc_crc)
 696                                        crc = crc32_be(crc, pos - 2, elen + 2);
 697
 698                                if (pos[3] == 1) {
 699                                        /* OUI Type 1 - WPA IE */
 700                                        elems->wpa = pos;
 701                                        elems->wpa_len = elen;
 702                                } else if (elen >= 5 && pos[3] == 2) {
 703                                        /* OUI Type 2 - WMM IE */
 704                                        if (pos[4] == 0) {
 705                                                elems->wmm_info = pos;
 706                                                elems->wmm_info_len = elen;
 707                                        } else if (pos[4] == 1) {
 708                                                elems->wmm_param = pos;
 709                                                elems->wmm_param_len = elen;
 710                                        }
 711                                }
 712                        }
 713                        break;
 714                case WLAN_EID_RSN:
 715                        elems->rsn = pos;
 716                        elems->rsn_len = elen;
 717                        break;
 718                case WLAN_EID_ERP_INFO:
 719                        elems->erp_info = pos;
 720                        elems->erp_info_len = elen;
 721                        break;
 722                case WLAN_EID_EXT_SUPP_RATES:
 723                        elems->ext_supp_rates = pos;
 724                        elems->ext_supp_rates_len = elen;
 725                        break;
 726                case WLAN_EID_HT_CAPABILITY:
 727                        if (elen >= sizeof(struct ieee80211_ht_cap))
 728                                elems->ht_cap_elem = (void *)pos;
 729                        else
 730                                elem_parse_failed = true;
 731                        break;
 732                case WLAN_EID_HT_OPERATION:
 733                        if (elen >= sizeof(struct ieee80211_ht_operation))
 734                                elems->ht_operation = (void *)pos;
 735                        else
 736                                elem_parse_failed = true;
 737                        break;
 738                case WLAN_EID_MESH_ID:
 739                        elems->mesh_id = pos;
 740                        elems->mesh_id_len = elen;
 741                        break;
 742                case WLAN_EID_MESH_CONFIG:
 743                        if (elen >= sizeof(struct ieee80211_meshconf_ie))
 744                                elems->mesh_config = (void *)pos;
 745                        else
 746                                elem_parse_failed = true;
 747                        break;
 748                case WLAN_EID_PEER_MGMT:
 749                        elems->peering = pos;
 750                        elems->peering_len = elen;
 751                        break;
 752                case WLAN_EID_PREQ:
 753                        elems->preq = pos;
 754                        elems->preq_len = elen;
 755                        break;
 756                case WLAN_EID_PREP:
 757                        elems->prep = pos;
 758                        elems->prep_len = elen;
 759                        break;
 760                case WLAN_EID_PERR:
 761                        elems->perr = pos;
 762                        elems->perr_len = elen;
 763                        break;
 764                case WLAN_EID_RANN:
 765                        if (elen >= sizeof(struct ieee80211_rann_ie))
 766                                elems->rann = (void *)pos;
 767                        else
 768                                elem_parse_failed = true;
 769                        break;
 770                case WLAN_EID_CHANNEL_SWITCH:
 771                        elems->ch_switch_elem = pos;
 772                        elems->ch_switch_elem_len = elen;
 773                        break;
 774                case WLAN_EID_QUIET:
 775                        if (!elems->quiet_elem) {
 776                                elems->quiet_elem = pos;
 777                                elems->quiet_elem_len = elen;
 778                        }
 779                        elems->num_of_quiet_elem++;
 780                        break;
 781                case WLAN_EID_COUNTRY:
 782                        elems->country_elem = pos;
 783                        elems->country_elem_len = elen;
 784                        break;
 785                case WLAN_EID_PWR_CONSTRAINT:
 786                        elems->pwr_constr_elem = pos;
 787                        elems->pwr_constr_elem_len = elen;
 788                        break;
 789                case WLAN_EID_TIMEOUT_INTERVAL:
 790                        elems->timeout_int = pos;
 791                        elems->timeout_int_len = elen;
 792                        break;
 793                default:
 794                        break;
 795                }
 796
 797                if (elem_parse_failed)
 798                        elems->parse_error = true;
 799                else
 800                        set_bit(id, seen_elems);
 801
 802                left -= elen;
 803                pos += elen;
 804        }
 805
 806        if (left != 0)
 807                elems->parse_error = true;
 808
 809        return crc;
 810}
 811
 812void ieee802_11_parse_elems(u8 *start, size_t len,
 813                            struct ieee802_11_elems *elems)
 814{
 815        ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
 816}
 817
 818void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
 819                               bool bss_notify)
 820{
 821        struct ieee80211_local *local = sdata->local;
 822        struct ieee80211_tx_queue_params qparam;
 823        int ac;
 824        bool use_11b, enable_qos;
 825        int aCWmin, aCWmax;
 826
 827        if (!local->ops->conf_tx)
 828                return;
 829
 830        if (local->hw.queues < IEEE80211_NUM_ACS)
 831                return;
 832
 833        memset(&qparam, 0, sizeof(qparam));
 834
 835        use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
 836                 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
 837
 838        /*
 839         * By default disable QoS in STA mode for old access points, which do
 840         * not support 802.11e. New APs will provide proper queue parameters,
 841         * that we will configure later.
 842         */
 843        enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
 844
 845        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 846                /* Set defaults according to 802.11-2007 Table 7-37 */
 847                aCWmax = 1023;
 848                if (use_11b)
 849                        aCWmin = 31;
 850                else
 851                        aCWmin = 15;
 852
 853                if (enable_qos) {
 854                        switch (ac) {
 855                        case IEEE80211_AC_BK:
 856                                qparam.cw_max = aCWmax;
 857                                qparam.cw_min = aCWmin;
 858                                qparam.txop = 0;
 859                                qparam.aifs = 7;
 860                                break;
 861                        /* never happens but let's not leave undefined */
 862                        default:
 863                        case IEEE80211_AC_BE:
 864                                qparam.cw_max = aCWmax;
 865                                qparam.cw_min = aCWmin;
 866                                qparam.txop = 0;
 867                                qparam.aifs = 3;
 868                                break;
 869                        case IEEE80211_AC_VI:
 870                                qparam.cw_max = aCWmin;
 871                                qparam.cw_min = (aCWmin + 1) / 2 - 1;
 872                                if (use_11b)
 873                                        qparam.txop = 6016/32;
 874                                else
 875                                        qparam.txop = 3008/32;
 876                                qparam.aifs = 2;
 877                                break;
 878                        case IEEE80211_AC_VO:
 879                                qparam.cw_max = (aCWmin + 1) / 2 - 1;
 880                                qparam.cw_min = (aCWmin + 1) / 4 - 1;
 881                                if (use_11b)
 882                                        qparam.txop = 3264/32;
 883                                else
 884                                        qparam.txop = 1504/32;
 885                                qparam.aifs = 2;
 886                                break;
 887                        }
 888                } else {
 889                        /* Confiure old 802.11b/g medium access rules. */
 890                        qparam.cw_max = aCWmax;
 891                        qparam.cw_min = aCWmin;
 892                        qparam.txop = 0;
 893                        qparam.aifs = 2;
 894                }
 895
 896                qparam.uapsd = false;
 897
 898                sdata->tx_conf[ac] = qparam;
 899                drv_conf_tx(local, sdata, ac, &qparam);
 900        }
 901
 902        if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
 903                sdata->vif.bss_conf.qos = enable_qos;
 904                if (bss_notify)
 905                        ieee80211_bss_info_change_notify(sdata,
 906                                                         BSS_CHANGED_QOS);
 907        }
 908}
 909
 910void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 911                                  const size_t supp_rates_len,
 912                                  const u8 *supp_rates)
 913{
 914        struct ieee80211_local *local = sdata->local;
 915        int i, have_higher_than_11mbit = 0;
 916
 917        /* cf. IEEE 802.11 9.2.12 */
 918        for (i = 0; i < supp_rates_len; i++)
 919                if ((supp_rates[i] & 0x7f) * 5 > 110)
 920                        have_higher_than_11mbit = 1;
 921
 922        if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 923            have_higher_than_11mbit)
 924                sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 925        else
 926                sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 927
 928        ieee80211_set_wmm_default(sdata, true);
 929}
 930
 931u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 932                              enum ieee80211_band band)
 933{
 934        struct ieee80211_supported_band *sband;
 935        struct ieee80211_rate *bitrates;
 936        u32 mandatory_rates;
 937        enum ieee80211_rate_flags mandatory_flag;
 938        int i;
 939
 940        sband = local->hw.wiphy->bands[band];
 941        if (WARN_ON(!sband))
 942                return 1;
 943
 944        if (band == IEEE80211_BAND_2GHZ)
 945                mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 946        else
 947                mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 948
 949        bitrates = sband->bitrates;
 950        mandatory_rates = 0;
 951        for (i = 0; i < sband->n_bitrates; i++)
 952                if (bitrates[i].flags & mandatory_flag)
 953                        mandatory_rates |= BIT(i);
 954        return mandatory_rates;
 955}
 956
 957void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 958                         u16 transaction, u16 auth_alg,
 959                         u8 *extra, size_t extra_len, const u8 *da,
 960                         const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
 961{
 962        struct ieee80211_local *local = sdata->local;
 963        struct sk_buff *skb;
 964        struct ieee80211_mgmt *mgmt;
 965        int err;
 966
 967        skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 968                            sizeof(*mgmt) + 6 + extra_len);
 969        if (!skb)
 970                return;
 971
 972        skb_reserve(skb, local->hw.extra_tx_headroom);
 973
 974        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 975        memset(mgmt, 0, 24 + 6);
 976        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 977                                          IEEE80211_STYPE_AUTH);
 978        memcpy(mgmt->da, da, ETH_ALEN);
 979        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 980        memcpy(mgmt->bssid, bssid, ETH_ALEN);
 981        mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 982        mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 983        mgmt->u.auth.status_code = cpu_to_le16(0);
 984        if (extra)
 985                memcpy(skb_put(skb, extra_len), extra, extra_len);
 986
 987        if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
 988                mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 989                err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
 990                WARN_ON(err);
 991        }
 992
 993        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 994        ieee80211_tx_skb(sdata, skb);
 995}
 996
 997int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
 998                             const u8 *ie, size_t ie_len,
 999                             enum ieee80211_band band, u32 rate_mask,
1000                             u8 channel)
1001{
1002        struct ieee80211_supported_band *sband;
1003        u8 *pos;
1004        size_t offset = 0, noffset;
1005        int supp_rates_len, i;
1006        u8 rates[32];
1007        int num_rates;
1008        int ext_rates_len;
1009
1010        sband = local->hw.wiphy->bands[band];
1011        if (WARN_ON_ONCE(!sband))
1012                return 0;
1013
1014        pos = buffer;
1015
1016        num_rates = 0;
1017        for (i = 0; i < sband->n_bitrates; i++) {
1018                if ((BIT(i) & rate_mask) == 0)
1019                        continue; /* skip rate */
1020                rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1021        }
1022
1023        supp_rates_len = min_t(int, num_rates, 8);
1024
1025        *pos++ = WLAN_EID_SUPP_RATES;
1026        *pos++ = supp_rates_len;
1027        memcpy(pos, rates, supp_rates_len);
1028        pos += supp_rates_len;
1029
1030        /* insert "request information" if in custom IEs */
1031        if (ie && ie_len) {
1032                static const u8 before_extrates[] = {
1033                        WLAN_EID_SSID,
1034                        WLAN_EID_SUPP_RATES,
1035                        WLAN_EID_REQUEST,
1036                };
1037                noffset = ieee80211_ie_split(ie, ie_len,
1038                                             before_extrates,
1039                                             ARRAY_SIZE(before_extrates),
1040                                             offset);
1041                memcpy(pos, ie + offset, noffset - offset);
1042                pos += noffset - offset;
1043                offset = noffset;
1044        }
1045
1046        ext_rates_len = num_rates - supp_rates_len;
1047        if (ext_rates_len > 0) {
1048                *pos++ = WLAN_EID_EXT_SUPP_RATES;
1049                *pos++ = ext_rates_len;
1050                memcpy(pos, rates + supp_rates_len, ext_rates_len);
1051                pos += ext_rates_len;
1052        }
1053
1054        if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1055                *pos++ = WLAN_EID_DS_PARAMS;
1056                *pos++ = 1;
1057                *pos++ = channel;
1058        }
1059
1060        /* insert custom IEs that go before HT */
1061        if (ie && ie_len) {
1062                static const u8 before_ht[] = {
1063                        WLAN_EID_SSID,
1064                        WLAN_EID_SUPP_RATES,
1065                        WLAN_EID_REQUEST,
1066                        WLAN_EID_EXT_SUPP_RATES,
1067                        WLAN_EID_DS_PARAMS,
1068                        WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1069                };
1070                noffset = ieee80211_ie_split(ie, ie_len,
1071                                             before_ht, ARRAY_SIZE(before_ht),
1072                                             offset);
1073                memcpy(pos, ie + offset, noffset - offset);
1074                pos += noffset - offset;
1075                offset = noffset;
1076        }
1077
1078        if (sband->ht_cap.ht_supported)
1079                pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1080                                                sband->ht_cap.cap);
1081
1082        /*
1083         * If adding more here, adjust code in main.c
1084         * that calculates local->scan_ies_len.
1085         */
1086
1087        /* add any remaining custom IEs */
1088        if (ie && ie_len) {
1089                noffset = ie_len;
1090                memcpy(pos, ie + offset, noffset - offset);
1091                pos += noffset - offset;
1092        }
1093
1094        if (sband->vht_cap.vht_supported)
1095                pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1096                                                 sband->vht_cap.cap);
1097
1098        return pos - buffer;
1099}
1100
1101struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1102                                          u8 *dst, u32 ratemask,
1103                                          const u8 *ssid, size_t ssid_len,
1104                                          const u8 *ie, size_t ie_len,
1105                                          bool directed)
1106{
1107        struct ieee80211_local *local = sdata->local;
1108        struct sk_buff *skb;
1109        struct ieee80211_mgmt *mgmt;
1110        size_t buf_len;
1111        u8 *buf;
1112        u8 chan;
1113
1114        /* FIXME: come up with a proper value */
1115        buf = kmalloc(200 + ie_len, GFP_KERNEL);
1116        if (!buf)
1117                return NULL;
1118
1119        /*
1120         * Do not send DS Channel parameter for directed probe requests
1121         * in order to maximize the chance that we get a response.  Some
1122         * badly-behaved APs don't respond when this parameter is included.
1123         */
1124        if (directed)
1125                chan = 0;
1126        else
1127                chan = ieee80211_frequency_to_channel(
1128                        local->hw.conf.channel->center_freq);
1129
1130        buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1131                                           local->hw.conf.channel->band,
1132                                           ratemask, chan);
1133
1134        skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1135                                     ssid, ssid_len,
1136                                     buf, buf_len);
1137        if (!skb)
1138                goto out;
1139
1140        if (dst) {
1141                mgmt = (struct ieee80211_mgmt *) skb->data;
1142                memcpy(mgmt->da, dst, ETH_ALEN);
1143                memcpy(mgmt->bssid, dst, ETH_ALEN);
1144        }
1145
1146        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1147
1148 out:
1149        kfree(buf);
1150
1151        return skb;
1152}
1153
1154void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1155                              const u8 *ssid, size_t ssid_len,
1156                              const u8 *ie, size_t ie_len,
1157                              u32 ratemask, bool directed, bool no_cck)
1158{
1159        struct sk_buff *skb;
1160
1161        skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1162                                        ie, ie_len, directed);
1163        if (skb) {
1164                if (no_cck)
1165                        IEEE80211_SKB_CB(skb)->flags |=
1166                                IEEE80211_TX_CTL_NO_CCK_RATE;
1167                ieee80211_tx_skb(sdata, skb);
1168        }
1169}
1170
1171u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1172                            struct ieee802_11_elems *elems,
1173                            enum ieee80211_band band, u32 *basic_rates)
1174{
1175        struct ieee80211_supported_band *sband;
1176        struct ieee80211_rate *bitrates;
1177        size_t num_rates;
1178        u32 supp_rates;
1179        int i, j;
1180        sband = local->hw.wiphy->bands[band];
1181
1182        if (WARN_ON(!sband))
1183                return 1;
1184
1185        bitrates = sband->bitrates;
1186        num_rates = sband->n_bitrates;
1187        supp_rates = 0;
1188        for (i = 0; i < elems->supp_rates_len +
1189                     elems->ext_supp_rates_len; i++) {
1190                u8 rate = 0;
1191                int own_rate;
1192                bool is_basic;
1193                if (i < elems->supp_rates_len)
1194                        rate = elems->supp_rates[i];
1195                else if (elems->ext_supp_rates)
1196                        rate = elems->ext_supp_rates
1197                                [i - elems->supp_rates_len];
1198                own_rate = 5 * (rate & 0x7f);
1199                is_basic = !!(rate & 0x80);
1200
1201                if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1202                        continue;
1203
1204                for (j = 0; j < num_rates; j++) {
1205                        if (bitrates[j].bitrate == own_rate) {
1206                                supp_rates |= BIT(j);
1207                                if (basic_rates && is_basic)
1208                                        *basic_rates |= BIT(j);
1209                        }
1210                }
1211        }
1212        return supp_rates;
1213}
1214
1215void ieee80211_stop_device(struct ieee80211_local *local)
1216{
1217        ieee80211_led_radio(local, false);
1218        ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1219
1220        cancel_work_sync(&local->reconfig_filter);
1221
1222        flush_workqueue(local->workqueue);
1223        drv_stop(local);
1224}
1225
1226int ieee80211_reconfig(struct ieee80211_local *local)
1227{
1228        struct ieee80211_hw *hw = &local->hw;
1229        struct ieee80211_sub_if_data *sdata;
1230        struct sta_info *sta;
1231        int res, i;
1232
1233#ifdef CONFIG_PM
1234        if (local->suspended)
1235                local->resuming = true;
1236
1237        if (local->wowlan) {
1238                local->wowlan = false;
1239                res = drv_resume(local);
1240                if (res < 0) {
1241                        local->resuming = false;
1242                        return res;
1243                }
1244                if (res == 0)
1245                        goto wake_up;
1246                WARN_ON(res > 1);
1247                /*
1248                 * res is 1, which means the driver requested
1249                 * to go through a regular reset on wakeup.
1250                 */
1251        }
1252#endif
1253        /* everything else happens only if HW was up & running */
1254        if (!local->open_count)
1255                goto wake_up;
1256
1257        /*
1258         * Upon resume hardware can sometimes be goofy due to
1259         * various platform / driver / bus issues, so restarting
1260         * the device may at times not work immediately. Propagate
1261         * the error.
1262         */
1263        res = drv_start(local);
1264        if (res) {
1265                WARN(local->suspended, "Hardware became unavailable "
1266                     "upon resume. This could be a software issue "
1267                     "prior to suspend or a hardware issue.\n");
1268                return res;
1269        }
1270
1271        /* setup fragmentation threshold */
1272        drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1273
1274        /* setup RTS threshold */
1275        drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1276
1277        /* reset coverage class */
1278        drv_set_coverage_class(local, hw->wiphy->coverage_class);
1279
1280        ieee80211_led_radio(local, true);
1281        ieee80211_mod_tpt_led_trig(local,
1282                                   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1283
1284        /* add interfaces */
1285        sdata = rtnl_dereference(local->monitor_sdata);
1286        if (sdata) {
1287                res = drv_add_interface(local, sdata);
1288                if (WARN_ON(res)) {
1289                        rcu_assign_pointer(local->monitor_sdata, NULL);
1290                        synchronize_net();
1291                        kfree(sdata);
1292                }
1293        }
1294
1295        list_for_each_entry(sdata, &local->interfaces, list) {
1296                if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1297                    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1298                    ieee80211_sdata_running(sdata))
1299                        res = drv_add_interface(local, sdata);
1300        }
1301
1302        /* add STAs back */
1303        mutex_lock(&local->sta_mtx);
1304        list_for_each_entry(sta, &local->sta_list, list) {
1305                enum ieee80211_sta_state state;
1306
1307                if (!sta->uploaded)
1308                        continue;
1309
1310                /* AP-mode stations will be added later */
1311                if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1312                        continue;
1313
1314                for (state = IEEE80211_STA_NOTEXIST;
1315                     state < sta->sta_state; state++)
1316                        WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1317                                              state + 1));
1318        }
1319        mutex_unlock(&local->sta_mtx);
1320
1321        /* reconfigure tx conf */
1322        if (hw->queues >= IEEE80211_NUM_ACS) {
1323                list_for_each_entry(sdata, &local->interfaces, list) {
1324                        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1325                            sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1326                            !ieee80211_sdata_running(sdata))
1327                                continue;
1328
1329                        for (i = 0; i < IEEE80211_NUM_ACS; i++)
1330                                drv_conf_tx(local, sdata, i,
1331                                            &sdata->tx_conf[i]);
1332                }
1333        }
1334
1335        /* reconfigure hardware */
1336        ieee80211_hw_config(local, ~0);
1337
1338        ieee80211_configure_filter(local);
1339
1340        /* Finally also reconfigure all the BSS information */
1341        list_for_each_entry(sdata, &local->interfaces, list) {
1342                u32 changed;
1343
1344                if (!ieee80211_sdata_running(sdata))
1345                        continue;
1346
1347                /* common change flags for all interface types */
1348                changed = BSS_CHANGED_ERP_CTS_PROT |
1349                          BSS_CHANGED_ERP_PREAMBLE |
1350                          BSS_CHANGED_ERP_SLOT |
1351                          BSS_CHANGED_HT |
1352                          BSS_CHANGED_BASIC_RATES |
1353                          BSS_CHANGED_BEACON_INT |
1354                          BSS_CHANGED_BSSID |
1355                          BSS_CHANGED_CQM |
1356                          BSS_CHANGED_QOS |
1357                          BSS_CHANGED_IDLE;
1358
1359                switch (sdata->vif.type) {
1360                case NL80211_IFTYPE_STATION:
1361                        changed |= BSS_CHANGED_ASSOC |
1362                                   BSS_CHANGED_ARP_FILTER;
1363                        mutex_lock(&sdata->u.mgd.mtx);
1364                        ieee80211_bss_info_change_notify(sdata, changed);
1365                        mutex_unlock(&sdata->u.mgd.mtx);
1366                        break;
1367                case NL80211_IFTYPE_ADHOC:
1368                        changed |= BSS_CHANGED_IBSS;
1369                        /* fall through */
1370                case NL80211_IFTYPE_AP:
1371                        changed |= BSS_CHANGED_SSID;
1372
1373                        if (sdata->vif.type == NL80211_IFTYPE_AP)
1374                                changed |= BSS_CHANGED_AP_PROBE_RESP;
1375
1376                        /* fall through */
1377                case NL80211_IFTYPE_MESH_POINT:
1378                        changed |= BSS_CHANGED_BEACON |
1379                                   BSS_CHANGED_BEACON_ENABLED;
1380                        ieee80211_bss_info_change_notify(sdata, changed);
1381                        break;
1382                case NL80211_IFTYPE_WDS:
1383                        break;
1384                case NL80211_IFTYPE_AP_VLAN:
1385                case NL80211_IFTYPE_MONITOR:
1386                        /* ignore virtual */
1387                        break;
1388                case NL80211_IFTYPE_UNSPECIFIED:
1389                case NUM_NL80211_IFTYPES:
1390                case NL80211_IFTYPE_P2P_CLIENT:
1391                case NL80211_IFTYPE_P2P_GO:
1392                        WARN_ON(1);
1393                        break;
1394                }
1395        }
1396
1397        ieee80211_recalc_ps(local, -1);
1398
1399        /*
1400         * The sta might be in psm against the ap (e.g. because
1401         * this was the state before a hw restart), so we
1402         * explicitly send a null packet in order to make sure
1403         * it'll sync against the ap (and get out of psm).
1404         */
1405        if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1406                list_for_each_entry(sdata, &local->interfaces, list) {
1407                        if (sdata->vif.type != NL80211_IFTYPE_STATION)
1408                                continue;
1409
1410                        ieee80211_send_nullfunc(local, sdata, 0);
1411                }
1412        }
1413
1414        /* APs are now beaconing, add back stations */
1415        mutex_lock(&local->sta_mtx);
1416        list_for_each_entry(sta, &local->sta_list, list) {
1417                enum ieee80211_sta_state state;
1418
1419                if (!sta->uploaded)
1420                        continue;
1421
1422                if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1423                        continue;
1424
1425                for (state = IEEE80211_STA_NOTEXIST;
1426                     state < sta->sta_state; state++)
1427                        WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1428                                              state + 1));
1429        }
1430        mutex_unlock(&local->sta_mtx);
1431
1432        /* add back keys */
1433        list_for_each_entry(sdata, &local->interfaces, list)
1434                if (ieee80211_sdata_running(sdata))
1435                        ieee80211_enable_keys(sdata);
1436
1437 wake_up:
1438        local->in_reconfig = false;
1439        barrier();
1440
1441        /*
1442         * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1443         * sessions can be established after a resume.
1444         *
1445         * Also tear down aggregation sessions since reconfiguring
1446         * them in a hardware restart scenario is not easily done
1447         * right now, and the hardware will have lost information
1448         * about the sessions, but we and the AP still think they
1449         * are active. This is really a workaround though.
1450         */
1451        if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1452                mutex_lock(&local->sta_mtx);
1453
1454                list_for_each_entry(sta, &local->sta_list, list) {
1455                        ieee80211_sta_tear_down_BA_sessions(sta, true);
1456                        clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1457                }
1458
1459                mutex_unlock(&local->sta_mtx);
1460        }
1461
1462        ieee80211_wake_queues_by_reason(hw,
1463                        IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1464
1465        /*
1466         * If this is for hw restart things are still running.
1467         * We may want to change that later, however.
1468         */
1469        if (!local->suspended)
1470                return 0;
1471
1472#ifdef CONFIG_PM
1473        /* first set suspended false, then resuming */
1474        local->suspended = false;
1475        mb();
1476        local->resuming = false;
1477
1478        list_for_each_entry(sdata, &local->interfaces, list) {
1479                switch(sdata->vif.type) {
1480                case NL80211_IFTYPE_STATION:
1481                        ieee80211_sta_restart(sdata);
1482                        break;
1483                case NL80211_IFTYPE_ADHOC:
1484                        ieee80211_ibss_restart(sdata);
1485                        break;
1486                case NL80211_IFTYPE_MESH_POINT:
1487                        ieee80211_mesh_restart(sdata);
1488                        break;
1489                default:
1490                        break;
1491                }
1492        }
1493
1494        mod_timer(&local->sta_cleanup, jiffies + 1);
1495
1496        mutex_lock(&local->sta_mtx);
1497        list_for_each_entry(sta, &local->sta_list, list)
1498                mesh_plink_restart(sta);
1499        mutex_unlock(&local->sta_mtx);
1500#else
1501        WARN_ON(1);
1502#endif
1503        return 0;
1504}
1505
1506void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1507{
1508        struct ieee80211_sub_if_data *sdata;
1509        struct ieee80211_local *local;
1510        struct ieee80211_key *key;
1511
1512        if (WARN_ON(!vif))
1513                return;
1514
1515        sdata = vif_to_sdata(vif);
1516        local = sdata->local;
1517
1518        if (WARN_ON(!local->resuming))
1519                return;
1520
1521        if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1522                return;
1523
1524        sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1525
1526        mutex_lock(&local->key_mtx);
1527        list_for_each_entry(key, &sdata->key_list, list)
1528                key->flags |= KEY_FLAG_TAINTED;
1529        mutex_unlock(&local->key_mtx);
1530}
1531EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1532
1533static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1534                          enum ieee80211_smps_mode *smps_mode)
1535{
1536        if (ifmgd->associated) {
1537                *smps_mode = ifmgd->ap_smps;
1538
1539                if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1540                        if (ifmgd->powersave)
1541                                *smps_mode = IEEE80211_SMPS_DYNAMIC;
1542                        else
1543                                *smps_mode = IEEE80211_SMPS_OFF;
1544                }
1545
1546                return 1;
1547        }
1548
1549        return 0;
1550}
1551
1552/* must hold iflist_mtx */
1553void ieee80211_recalc_smps(struct ieee80211_local *local)
1554{
1555        struct ieee80211_sub_if_data *sdata;
1556        enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1557        int count = 0;
1558
1559        lockdep_assert_held(&local->iflist_mtx);
1560
1561        /*
1562         * This function could be improved to handle multiple
1563         * interfaces better, but right now it makes any
1564         * non-station interfaces force SM PS to be turned
1565         * off. If there are multiple station interfaces it
1566         * could also use the best possible mode, e.g. if
1567         * one is in static and the other in dynamic then
1568         * dynamic is ok.
1569         */
1570
1571        list_for_each_entry(sdata, &local->interfaces, list) {
1572                if (!ieee80211_sdata_running(sdata))
1573                        continue;
1574                if (sdata->vif.type != NL80211_IFTYPE_STATION)
1575                        goto set;
1576
1577                count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1578
1579                if (count > 1) {
1580                        smps_mode = IEEE80211_SMPS_OFF;
1581                        break;
1582                }
1583        }
1584
1585        if (smps_mode == local->smps_mode)
1586                return;
1587
1588 set:
1589        local->smps_mode = smps_mode;
1590        /* changed flag is auto-detected for this */
1591        ieee80211_hw_config(local, 0);
1592}
1593
1594static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1595{
1596        int i;
1597
1598        for (i = 0; i < n_ids; i++)
1599                if (ids[i] == id)
1600                        return true;
1601        return false;
1602}
1603
1604/**
1605 * ieee80211_ie_split - split an IE buffer according to ordering
1606 *
1607 * @ies: the IE buffer
1608 * @ielen: the length of the IE buffer
1609 * @ids: an array with element IDs that are allowed before
1610 *      the split
1611 * @n_ids: the size of the element ID array
1612 * @offset: offset where to start splitting in the buffer
1613 *
1614 * This function splits an IE buffer by updating the @offset
1615 * variable to point to the location where the buffer should be
1616 * split.
1617 *
1618 * It assumes that the given IE buffer is well-formed, this
1619 * has to be guaranteed by the caller!
1620 *
1621 * It also assumes that the IEs in the buffer are ordered
1622 * correctly, if not the result of using this function will not
1623 * be ordered correctly either, i.e. it does no reordering.
1624 *
1625 * The function returns the offset where the next part of the
1626 * buffer starts, which may be @ielen if the entire (remainder)
1627 * of the buffer should be used.
1628 */
1629size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1630                          const u8 *ids, int n_ids, size_t offset)
1631{
1632        size_t pos = offset;
1633
1634        while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1635                pos += 2 + ies[pos + 1];
1636
1637        return pos;
1638}
1639
1640size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1641{
1642        size_t pos = offset;
1643
1644        while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1645                pos += 2 + ies[pos + 1];
1646
1647        return pos;
1648}
1649
1650static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1651                                            int rssi_min_thold,
1652                                            int rssi_max_thold)
1653{
1654        trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1655
1656        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1657                return;
1658
1659        /*
1660         * Scale up threshold values before storing it, as the RSSI averaging
1661         * algorithm uses a scaled up value as well. Change this scaling
1662         * factor if the RSSI averaging algorithm changes.
1663         */
1664        sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1665        sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1666}
1667
1668void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1669                                    int rssi_min_thold,
1670                                    int rssi_max_thold)
1671{
1672        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1673
1674        WARN_ON(rssi_min_thold == rssi_max_thold ||
1675                rssi_min_thold > rssi_max_thold);
1676
1677        _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1678                                       rssi_max_thold);
1679}
1680EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1681
1682void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1683{
1684        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1685
1686        _ieee80211_enable_rssi_reports(sdata, 0, 0);
1687}
1688EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1689
1690u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1691                              u16 cap)
1692{
1693        __le16 tmp;
1694
1695        *pos++ = WLAN_EID_HT_CAPABILITY;
1696        *pos++ = sizeof(struct ieee80211_ht_cap);
1697        memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1698
1699        /* capability flags */
1700        tmp = cpu_to_le16(cap);
1701        memcpy(pos, &tmp, sizeof(u16));
1702        pos += sizeof(u16);
1703
1704        /* AMPDU parameters */
1705        *pos++ = ht_cap->ampdu_factor |
1706                 (ht_cap->ampdu_density <<
1707                        IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1708
1709        /* MCS set */
1710        memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1711        pos += sizeof(ht_cap->mcs);
1712
1713        /* extended capabilities */
1714        pos += sizeof(__le16);
1715
1716        /* BF capabilities */
1717        pos += sizeof(__le32);
1718
1719        /* antenna selection */
1720        pos += sizeof(u8);
1721
1722        return pos;
1723}
1724
1725u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1726                                                           u32 cap)
1727{
1728        __le32 tmp;
1729
1730        *pos++ = WLAN_EID_VHT_CAPABILITY;
1731        *pos++ = sizeof(struct ieee80211_vht_capabilities);
1732        memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1733
1734        /* capability flags */
1735        tmp = cpu_to_le32(cap);
1736        memcpy(pos, &tmp, sizeof(u32));
1737        pos += sizeof(u32);
1738
1739        /* VHT MCS set */
1740        memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1741        pos += sizeof(vht_cap->vht_mcs);
1742
1743        return pos;
1744}
1745
1746u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1747                               struct ieee80211_channel *channel,
1748                               enum nl80211_channel_type channel_type,
1749                               u16 prot_mode)
1750{
1751        struct ieee80211_ht_operation *ht_oper;
1752        /* Build HT Information */
1753        *pos++ = WLAN_EID_HT_OPERATION;
1754        *pos++ = sizeof(struct ieee80211_ht_operation);
1755        ht_oper = (struct ieee80211_ht_operation *)pos;
1756        ht_oper->primary_chan =
1757                        ieee80211_frequency_to_channel(channel->center_freq);
1758        switch (channel_type) {
1759        case NL80211_CHAN_HT40MINUS:
1760                ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1761                break;
1762        case NL80211_CHAN_HT40PLUS:
1763                ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1764                break;
1765        case NL80211_CHAN_HT20:
1766        default:
1767                ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1768                break;
1769        }
1770        if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1771            channel_type != NL80211_CHAN_NO_HT &&
1772            channel_type != NL80211_CHAN_HT20)
1773                ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1774
1775        ht_oper->operation_mode = cpu_to_le16(prot_mode);
1776        ht_oper->stbc_param = 0x0000;
1777
1778        /* It seems that Basic MCS set and Supported MCS set
1779           are identical for the first 10 bytes */
1780        memset(&ht_oper->basic_set, 0, 16);
1781        memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1782
1783        return pos + sizeof(struct ieee80211_ht_operation);
1784}
1785
1786enum nl80211_channel_type
1787ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1788{
1789        enum nl80211_channel_type channel_type;
1790
1791        if (!ht_oper)
1792                return NL80211_CHAN_NO_HT;
1793
1794        switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1795        case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1796                channel_type = NL80211_CHAN_HT20;
1797                break;
1798        case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1799                channel_type = NL80211_CHAN_HT40PLUS;
1800                break;
1801        case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1802                channel_type = NL80211_CHAN_HT40MINUS;
1803                break;
1804        default:
1805                channel_type = NL80211_CHAN_NO_HT;
1806        }
1807
1808        return channel_type;
1809}
1810
1811int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1812                            struct sk_buff *skb, bool need_basic)
1813{
1814        struct ieee80211_local *local = sdata->local;
1815        struct ieee80211_supported_band *sband;
1816        int rate;
1817        u8 i, rates, *pos;
1818        u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1819
1820        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1821        rates = sband->n_bitrates;
1822        if (rates > 8)
1823                rates = 8;
1824
1825        if (skb_tailroom(skb) < rates + 2)
1826                return -ENOMEM;
1827
1828        pos = skb_put(skb, rates + 2);
1829        *pos++ = WLAN_EID_SUPP_RATES;
1830        *pos++ = rates;
1831        for (i = 0; i < rates; i++) {
1832                u8 basic = 0;
1833                if (need_basic && basic_rates & BIT(i))
1834                        basic = 0x80;
1835                rate = sband->bitrates[i].bitrate;
1836                *pos++ = basic | (u8) (rate / 5);
1837        }
1838
1839        return 0;
1840}
1841
1842int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1843                                struct sk_buff *skb, bool need_basic)
1844{
1845        struct ieee80211_local *local = sdata->local;
1846        struct ieee80211_supported_band *sband;
1847        int rate;
1848        u8 i, exrates, *pos;
1849        u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1850
1851        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1852        exrates = sband->n_bitrates;
1853        if (exrates > 8)
1854                exrates -= 8;
1855        else
1856                exrates = 0;
1857
1858        if (skb_tailroom(skb) < exrates + 2)
1859                return -ENOMEM;
1860
1861        if (exrates) {
1862                pos = skb_put(skb, exrates + 2);
1863                *pos++ = WLAN_EID_EXT_SUPP_RATES;
1864                *pos++ = exrates;
1865                for (i = 8; i < sband->n_bitrates; i++) {
1866                        u8 basic = 0;
1867                        if (need_basic && basic_rates & BIT(i))
1868                                basic = 0x80;
1869                        rate = sband->bitrates[i].bitrate;
1870                        *pos++ = basic | (u8) (rate / 5);
1871                }
1872        }
1873        return 0;
1874}
1875
1876int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1877{
1878        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1879        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1880
1881        if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1882                /* non-managed type inferfaces */
1883                return 0;
1884        }
1885        return ifmgd->ave_beacon_signal;
1886}
1887EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
1888
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