linux/net/mac80211/mlme.c
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   1/*
   2 * BSS client mode implementation
   3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4 * Copyright 2004, Instant802 Networks, Inc.
   5 * Copyright 2005, Devicescape Software, Inc.
   6 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#include <linux/delay.h>
  15#include <linux/if_ether.h>
  16#include <linux/skbuff.h>
  17#include <linux/if_arp.h>
  18#include <linux/etherdevice.h>
  19#include <linux/moduleparam.h>
  20#include <linux/rtnetlink.h>
  21#include <linux/pm_qos.h>
  22#include <linux/crc32.h>
  23#include <linux/slab.h>
  24#include <linux/export.h>
  25#include <net/mac80211.h>
  26#include <asm/unaligned.h>
  27
  28#include "ieee80211_i.h"
  29#include "driver-ops.h"
  30#include "rate.h"
  31#include "led.h"
  32
  33#define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  34#define IEEE80211_AUTH_MAX_TRIES 3
  35#define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
  36#define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  37#define IEEE80211_ASSOC_MAX_TRIES 3
  38
  39static int max_nullfunc_tries = 2;
  40module_param(max_nullfunc_tries, int, 0644);
  41MODULE_PARM_DESC(max_nullfunc_tries,
  42                 "Maximum nullfunc tx tries before disconnecting (reason 4).");
  43
  44static int max_probe_tries = 5;
  45module_param(max_probe_tries, int, 0644);
  46MODULE_PARM_DESC(max_probe_tries,
  47                 "Maximum probe tries before disconnecting (reason 4).");
  48
  49/*
  50 * Beacon loss timeout is calculated as N frames times the
  51 * advertised beacon interval.  This may need to be somewhat
  52 * higher than what hardware might detect to account for
  53 * delays in the host processing frames. But since we also
  54 * probe on beacon miss before declaring the connection lost
  55 * default to what we want.
  56 */
  57#define IEEE80211_BEACON_LOSS_COUNT     7
  58
  59/*
  60 * Time the connection can be idle before we probe
  61 * it to see if we can still talk to the AP.
  62 */
  63#define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  64/*
  65 * Time we wait for a probe response after sending
  66 * a probe request because of beacon loss or for
  67 * checking the connection still works.
  68 */
  69static int probe_wait_ms = 500;
  70module_param(probe_wait_ms, int, 0644);
  71MODULE_PARM_DESC(probe_wait_ms,
  72                 "Maximum time(ms) to wait for probe response"
  73                 " before disconnecting (reason 4).");
  74
  75/*
  76 * Weight given to the latest Beacon frame when calculating average signal
  77 * strength for Beacon frames received in the current BSS. This must be
  78 * between 1 and 15.
  79 */
  80#define IEEE80211_SIGNAL_AVE_WEIGHT     3
  81
  82/*
  83 * How many Beacon frames need to have been used in average signal strength
  84 * before starting to indicate signal change events.
  85 */
  86#define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  87
  88#define TMR_RUNNING_TIMER       0
  89#define TMR_RUNNING_CHANSW      1
  90
  91#define DEAUTH_DISASSOC_LEN     (24 /* hdr */ + 2 /* reason */)
  92
  93/*
  94 * All cfg80211 functions have to be called outside a locked
  95 * section so that they can acquire a lock themselves... This
  96 * is much simpler than queuing up things in cfg80211, but we
  97 * do need some indirection for that here.
  98 */
  99enum rx_mgmt_action {
 100        /* no action required */
 101        RX_MGMT_NONE,
 102
 103        /* caller must call cfg80211_send_deauth() */
 104        RX_MGMT_CFG80211_DEAUTH,
 105
 106        /* caller must call cfg80211_send_disassoc() */
 107        RX_MGMT_CFG80211_DISASSOC,
 108
 109        /* caller must call cfg80211_send_rx_auth() */
 110        RX_MGMT_CFG80211_RX_AUTH,
 111
 112        /* caller must call cfg80211_send_rx_assoc() */
 113        RX_MGMT_CFG80211_RX_ASSOC,
 114
 115        /* caller must call cfg80211_send_assoc_timeout() */
 116        RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 117};
 118
 119/* utils */
 120static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 121{
 122        lockdep_assert_held(&ifmgd->mtx);
 123}
 124
 125/*
 126 * We can have multiple work items (and connection probing)
 127 * scheduling this timer, but we need to take care to only
 128 * reschedule it when it should fire _earlier_ than it was
 129 * asked for before, or if it's not pending right now. This
 130 * function ensures that. Note that it then is required to
 131 * run this function for all timeouts after the first one
 132 * has happened -- the work that runs from this timer will
 133 * do that.
 134 */
 135static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 136{
 137        ASSERT_MGD_MTX(ifmgd);
 138
 139        if (!timer_pending(&ifmgd->timer) ||
 140            time_before(timeout, ifmgd->timer.expires))
 141                mod_timer(&ifmgd->timer, timeout);
 142}
 143
 144void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 145{
 146        if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 147                return;
 148
 149        mod_timer(&sdata->u.mgd.bcn_mon_timer,
 150                  round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 151}
 152
 153void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 154{
 155        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 156
 157        if (unlikely(!sdata->u.mgd.associated))
 158                return;
 159
 160        if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 161                return;
 162
 163        mod_timer(&sdata->u.mgd.conn_mon_timer,
 164                  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 165
 166        ifmgd->probe_send_count = 0;
 167}
 168
 169static int ecw2cw(int ecw)
 170{
 171        return (1 << ecw) - 1;
 172}
 173
 174static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
 175                                  struct ieee80211_ht_operation *ht_oper,
 176                                  const u8 *bssid, bool reconfig)
 177{
 178        struct ieee80211_local *local = sdata->local;
 179        struct ieee80211_supported_band *sband;
 180        struct sta_info *sta;
 181        u32 changed = 0;
 182        u16 ht_opmode;
 183        bool disable_40 = false;
 184
 185        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 186
 187        switch (sdata->vif.bss_conf.channel_type) {
 188        case NL80211_CHAN_HT40PLUS:
 189                if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 190                        disable_40 = true;
 191                break;
 192        case NL80211_CHAN_HT40MINUS:
 193                if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
 194                        disable_40 = true;
 195                break;
 196        default:
 197                break;
 198        }
 199
 200        /* This can change during the lifetime of the BSS */
 201        if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 202                disable_40 = true;
 203
 204        mutex_lock(&local->sta_mtx);
 205        sta = sta_info_get(sdata, bssid);
 206
 207        WARN_ON_ONCE(!sta);
 208
 209        if (sta && !sta->supports_40mhz)
 210                disable_40 = true;
 211
 212        if (sta && (!reconfig ||
 213                    (disable_40 != !(sta->sta.ht_cap.cap &
 214                                        IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 215
 216                if (disable_40)
 217                        sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 218                else
 219                        sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 220
 221                rate_control_rate_update(local, sband, sta,
 222                                         IEEE80211_RC_BW_CHANGED);
 223        }
 224        mutex_unlock(&local->sta_mtx);
 225
 226        ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 227
 228        /* if bss configuration changed store the new one */
 229        if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 230                changed |= BSS_CHANGED_HT;
 231                sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 232        }
 233
 234        return changed;
 235}
 236
 237/* frame sending functions */
 238
 239static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 240                                      struct ieee80211_supported_band *sband,
 241                                      u32 *rates)
 242{
 243        int i, j, count;
 244        *rates = 0;
 245        count = 0;
 246        for (i = 0; i < supp_rates_len; i++) {
 247                int rate = (supp_rates[i] & 0x7F) * 5;
 248
 249                for (j = 0; j < sband->n_bitrates; j++)
 250                        if (sband->bitrates[j].bitrate == rate) {
 251                                *rates |= BIT(j);
 252                                count++;
 253                                break;
 254                        }
 255        }
 256
 257        return count;
 258}
 259
 260static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 261                                struct sk_buff *skb, u8 ap_ht_param,
 262                                struct ieee80211_supported_band *sband,
 263                                struct ieee80211_channel *channel,
 264                                enum ieee80211_smps_mode smps)
 265{
 266        u8 *pos;
 267        u32 flags = channel->flags;
 268        u16 cap;
 269        struct ieee80211_sta_ht_cap ht_cap;
 270
 271        BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 272
 273        memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 274        ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 275
 276        /* determine capability flags */
 277        cap = ht_cap.cap;
 278
 279        switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 280        case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 281                if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 282                        cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 283                        cap &= ~IEEE80211_HT_CAP_SGI_40;
 284                }
 285                break;
 286        case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 287                if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 288                        cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 289                        cap &= ~IEEE80211_HT_CAP_SGI_40;
 290                }
 291                break;
 292        }
 293
 294        /*
 295         * If 40 MHz was disabled associate as though we weren't
 296         * capable of 40 MHz -- some broken APs will never fall
 297         * back to trying to transmit in 20 MHz.
 298         */
 299        if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 300                cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 301                cap &= ~IEEE80211_HT_CAP_SGI_40;
 302        }
 303
 304        /* set SM PS mode properly */
 305        cap &= ~IEEE80211_HT_CAP_SM_PS;
 306        switch (smps) {
 307        case IEEE80211_SMPS_AUTOMATIC:
 308        case IEEE80211_SMPS_NUM_MODES:
 309                WARN_ON(1);
 310        case IEEE80211_SMPS_OFF:
 311                cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 312                        IEEE80211_HT_CAP_SM_PS_SHIFT;
 313                break;
 314        case IEEE80211_SMPS_STATIC:
 315                cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 316                        IEEE80211_HT_CAP_SM_PS_SHIFT;
 317                break;
 318        case IEEE80211_SMPS_DYNAMIC:
 319                cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 320                        IEEE80211_HT_CAP_SM_PS_SHIFT;
 321                break;
 322        }
 323
 324        /* reserve and fill IE */
 325        pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 326        ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 327}
 328
 329static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 330{
 331        struct ieee80211_local *local = sdata->local;
 332        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 333        struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 334        struct sk_buff *skb;
 335        struct ieee80211_mgmt *mgmt;
 336        u8 *pos, qos_info;
 337        size_t offset = 0, noffset;
 338        int i, count, rates_len, supp_rates_len;
 339        u16 capab;
 340        struct ieee80211_supported_band *sband;
 341        u32 rates = 0;
 342
 343        lockdep_assert_held(&ifmgd->mtx);
 344
 345        sband = local->hw.wiphy->bands[local->oper_channel->band];
 346
 347        if (assoc_data->supp_rates_len) {
 348                /*
 349                 * Get all rates supported by the device and the AP as
 350                 * some APs don't like getting a superset of their rates
 351                 * in the association request (e.g. D-Link DAP 1353 in
 352                 * b-only mode)...
 353                 */
 354                rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 355                                                       assoc_data->supp_rates_len,
 356                                                       sband, &rates);
 357        } else {
 358                /*
 359                 * In case AP not provide any supported rates information
 360                 * before association, we send information element(s) with
 361                 * all rates that we support.
 362                 */
 363                rates = ~0;
 364                rates_len = sband->n_bitrates;
 365        }
 366
 367        skb = alloc_skb(local->hw.extra_tx_headroom +
 368                        sizeof(*mgmt) + /* bit too much but doesn't matter */
 369                        2 + assoc_data->ssid_len + /* SSID */
 370                        4 + rates_len + /* (extended) rates */
 371                        4 + /* power capability */
 372                        2 + 2 * sband->n_channels + /* supported channels */
 373                        2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 374                        assoc_data->ie_len + /* extra IEs */
 375                        9, /* WMM */
 376                        GFP_KERNEL);
 377        if (!skb)
 378                return;
 379
 380        skb_reserve(skb, local->hw.extra_tx_headroom);
 381
 382        capab = WLAN_CAPABILITY_ESS;
 383
 384        if (sband->band == IEEE80211_BAND_2GHZ) {
 385                if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 386                        capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 387                if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 388                        capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 389        }
 390
 391        if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 392                capab |= WLAN_CAPABILITY_PRIVACY;
 393
 394        if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 395            (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 396                capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 397
 398        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 399        memset(mgmt, 0, 24);
 400        memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 401        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 402        memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 403
 404        if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 405                skb_put(skb, 10);
 406                mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 407                                                  IEEE80211_STYPE_REASSOC_REQ);
 408                mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 409                mgmt->u.reassoc_req.listen_interval =
 410                                cpu_to_le16(local->hw.conf.listen_interval);
 411                memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 412                       ETH_ALEN);
 413        } else {
 414                skb_put(skb, 4);
 415                mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 416                                                  IEEE80211_STYPE_ASSOC_REQ);
 417                mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 418                mgmt->u.assoc_req.listen_interval =
 419                                cpu_to_le16(local->hw.conf.listen_interval);
 420        }
 421
 422        /* SSID */
 423        pos = skb_put(skb, 2 + assoc_data->ssid_len);
 424        *pos++ = WLAN_EID_SSID;
 425        *pos++ = assoc_data->ssid_len;
 426        memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 427
 428        /* add all rates which were marked to be used above */
 429        supp_rates_len = rates_len;
 430        if (supp_rates_len > 8)
 431                supp_rates_len = 8;
 432
 433        pos = skb_put(skb, supp_rates_len + 2);
 434        *pos++ = WLAN_EID_SUPP_RATES;
 435        *pos++ = supp_rates_len;
 436
 437        count = 0;
 438        for (i = 0; i < sband->n_bitrates; i++) {
 439                if (BIT(i) & rates) {
 440                        int rate = sband->bitrates[i].bitrate;
 441                        *pos++ = (u8) (rate / 5);
 442                        if (++count == 8)
 443                                break;
 444                }
 445        }
 446
 447        if (rates_len > count) {
 448                pos = skb_put(skb, rates_len - count + 2);
 449                *pos++ = WLAN_EID_EXT_SUPP_RATES;
 450                *pos++ = rates_len - count;
 451
 452                for (i++; i < sband->n_bitrates; i++) {
 453                        if (BIT(i) & rates) {
 454                                int rate = sband->bitrates[i].bitrate;
 455                                *pos++ = (u8) (rate / 5);
 456                        }
 457                }
 458        }
 459
 460        if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 461                /* 1. power capabilities */
 462                pos = skb_put(skb, 4);
 463                *pos++ = WLAN_EID_PWR_CAPABILITY;
 464                *pos++ = 2;
 465                *pos++ = 0; /* min tx power */
 466                *pos++ = local->oper_channel->max_power; /* max tx power */
 467
 468                /* 2. supported channels */
 469                /* TODO: get this in reg domain format */
 470                pos = skb_put(skb, 2 * sband->n_channels + 2);
 471                *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 472                *pos++ = 2 * sband->n_channels;
 473                for (i = 0; i < sband->n_channels; i++) {
 474                        *pos++ = ieee80211_frequency_to_channel(
 475                                        sband->channels[i].center_freq);
 476                        *pos++ = 1; /* one channel in the subband*/
 477                }
 478        }
 479
 480        /* if present, add any custom IEs that go before HT */
 481        if (assoc_data->ie_len && assoc_data->ie) {
 482                static const u8 before_ht[] = {
 483                        WLAN_EID_SSID,
 484                        WLAN_EID_SUPP_RATES,
 485                        WLAN_EID_EXT_SUPP_RATES,
 486                        WLAN_EID_PWR_CAPABILITY,
 487                        WLAN_EID_SUPPORTED_CHANNELS,
 488                        WLAN_EID_RSN,
 489                        WLAN_EID_QOS_CAPA,
 490                        WLAN_EID_RRM_ENABLED_CAPABILITIES,
 491                        WLAN_EID_MOBILITY_DOMAIN,
 492                        WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 493                };
 494                noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 495                                             before_ht, ARRAY_SIZE(before_ht),
 496                                             offset);
 497                pos = skb_put(skb, noffset - offset);
 498                memcpy(pos, assoc_data->ie + offset, noffset - offset);
 499                offset = noffset;
 500        }
 501
 502        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 503                ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 504                                    sband, local->oper_channel, ifmgd->ap_smps);
 505
 506        /* if present, add any custom non-vendor IEs that go after HT */
 507        if (assoc_data->ie_len && assoc_data->ie) {
 508                noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 509                                                    assoc_data->ie_len,
 510                                                    offset);
 511                pos = skb_put(skb, noffset - offset);
 512                memcpy(pos, assoc_data->ie + offset, noffset - offset);
 513                offset = noffset;
 514        }
 515
 516        if (assoc_data->wmm) {
 517                if (assoc_data->uapsd) {
 518                        qos_info = ifmgd->uapsd_queues;
 519                        qos_info |= (ifmgd->uapsd_max_sp_len <<
 520                                     IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 521                } else {
 522                        qos_info = 0;
 523                }
 524
 525                pos = skb_put(skb, 9);
 526                *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 527                *pos++ = 7; /* len */
 528                *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 529                *pos++ = 0x50;
 530                *pos++ = 0xf2;
 531                *pos++ = 2; /* WME */
 532                *pos++ = 0; /* WME info */
 533                *pos++ = 1; /* WME ver */
 534                *pos++ = qos_info;
 535        }
 536
 537        /* add any remaining custom (i.e. vendor specific here) IEs */
 538        if (assoc_data->ie_len && assoc_data->ie) {
 539                noffset = assoc_data->ie_len;
 540                pos = skb_put(skb, noffset - offset);
 541                memcpy(pos, assoc_data->ie + offset, noffset - offset);
 542        }
 543
 544        drv_mgd_prepare_tx(local, sdata);
 545
 546        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 547        ieee80211_tx_skb(sdata, skb);
 548}
 549
 550static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 551                                           const u8 *bssid, u16 stype,
 552                                           u16 reason, bool send_frame,
 553                                           u8 *frame_buf)
 554{
 555        struct ieee80211_local *local = sdata->local;
 556        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 557        struct sk_buff *skb;
 558        struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 559
 560        /* build frame */
 561        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 562        mgmt->duration = 0; /* initialize only */
 563        mgmt->seq_ctrl = 0; /* initialize only */
 564        memcpy(mgmt->da, bssid, ETH_ALEN);
 565        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 566        memcpy(mgmt->bssid, bssid, ETH_ALEN);
 567        /* u.deauth.reason_code == u.disassoc.reason_code */
 568        mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 569
 570        if (send_frame) {
 571                skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 572                                    DEAUTH_DISASSOC_LEN);
 573                if (!skb)
 574                        return;
 575
 576                skb_reserve(skb, local->hw.extra_tx_headroom);
 577
 578                /* copy in frame */
 579                memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 580                       mgmt, DEAUTH_DISASSOC_LEN);
 581
 582                if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 583                        IEEE80211_SKB_CB(skb)->flags |=
 584                                IEEE80211_TX_INTFL_DONT_ENCRYPT;
 585
 586                drv_mgd_prepare_tx(local, sdata);
 587
 588                ieee80211_tx_skb(sdata, skb);
 589        }
 590}
 591
 592void ieee80211_send_pspoll(struct ieee80211_local *local,
 593                           struct ieee80211_sub_if_data *sdata)
 594{
 595        struct ieee80211_pspoll *pspoll;
 596        struct sk_buff *skb;
 597
 598        skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 599        if (!skb)
 600                return;
 601
 602        pspoll = (struct ieee80211_pspoll *) skb->data;
 603        pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 604
 605        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 606        ieee80211_tx_skb(sdata, skb);
 607}
 608
 609void ieee80211_send_nullfunc(struct ieee80211_local *local,
 610                             struct ieee80211_sub_if_data *sdata,
 611                             int powersave)
 612{
 613        struct sk_buff *skb;
 614        struct ieee80211_hdr_3addr *nullfunc;
 615        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 616
 617        skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 618        if (!skb)
 619                return;
 620
 621        nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 622        if (powersave)
 623                nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 624
 625        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 626        if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 627                            IEEE80211_STA_CONNECTION_POLL))
 628                IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 629
 630        ieee80211_tx_skb(sdata, skb);
 631}
 632
 633static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 634                                          struct ieee80211_sub_if_data *sdata)
 635{
 636        struct sk_buff *skb;
 637        struct ieee80211_hdr *nullfunc;
 638        __le16 fc;
 639
 640        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 641                return;
 642
 643        skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 644        if (!skb)
 645                return;
 646
 647        skb_reserve(skb, local->hw.extra_tx_headroom);
 648
 649        nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 650        memset(nullfunc, 0, 30);
 651        fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 652                         IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 653        nullfunc->frame_control = fc;
 654        memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 655        memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 656        memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 657        memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 658
 659        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 660        ieee80211_tx_skb(sdata, skb);
 661}
 662
 663/* spectrum management related things */
 664static void ieee80211_chswitch_work(struct work_struct *work)
 665{
 666        struct ieee80211_sub_if_data *sdata =
 667                container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 668        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 669
 670        if (!ieee80211_sdata_running(sdata))
 671                return;
 672
 673        mutex_lock(&ifmgd->mtx);
 674        if (!ifmgd->associated)
 675                goto out;
 676
 677        sdata->local->oper_channel = sdata->local->csa_channel;
 678        if (!sdata->local->ops->channel_switch) {
 679                /* call "hw_config" only if doing sw channel switch */
 680                ieee80211_hw_config(sdata->local,
 681                        IEEE80211_CONF_CHANGE_CHANNEL);
 682        } else {
 683                /* update the device channel directly */
 684                sdata->local->hw.conf.channel = sdata->local->oper_channel;
 685        }
 686
 687        /* XXX: shouldn't really modify cfg80211-owned data! */
 688        ifmgd->associated->channel = sdata->local->oper_channel;
 689
 690        ieee80211_wake_queues_by_reason(&sdata->local->hw,
 691                                        IEEE80211_QUEUE_STOP_REASON_CSA);
 692 out:
 693        ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 694        mutex_unlock(&ifmgd->mtx);
 695}
 696
 697void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 698{
 699        struct ieee80211_sub_if_data *sdata;
 700        struct ieee80211_if_managed *ifmgd;
 701
 702        sdata = vif_to_sdata(vif);
 703        ifmgd = &sdata->u.mgd;
 704
 705        trace_api_chswitch_done(sdata, success);
 706        if (!success) {
 707                /*
 708                 * If the channel switch was not successful, stay
 709                 * around on the old channel. We currently lack
 710                 * good handling of this situation, possibly we
 711                 * should just drop the association.
 712                 */
 713                sdata->local->csa_channel = sdata->local->oper_channel;
 714        }
 715
 716        ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 717}
 718EXPORT_SYMBOL(ieee80211_chswitch_done);
 719
 720static void ieee80211_chswitch_timer(unsigned long data)
 721{
 722        struct ieee80211_sub_if_data *sdata =
 723                (struct ieee80211_sub_if_data *) data;
 724        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 725
 726        if (sdata->local->quiescing) {
 727                set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 728                return;
 729        }
 730
 731        ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 732}
 733
 734void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 735                                      struct ieee80211_channel_sw_ie *sw_elem,
 736                                      struct ieee80211_bss *bss,
 737                                      u64 timestamp)
 738{
 739        struct cfg80211_bss *cbss =
 740                container_of((void *)bss, struct cfg80211_bss, priv);
 741        struct ieee80211_channel *new_ch;
 742        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 743        int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 744                                                      cbss->channel->band);
 745
 746        ASSERT_MGD_MTX(ifmgd);
 747
 748        if (!ifmgd->associated)
 749                return;
 750
 751        if (sdata->local->scanning)
 752                return;
 753
 754        /* Disregard subsequent beacons if we are already running a timer
 755           processing a CSA */
 756
 757        if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 758                return;
 759
 760        new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 761        if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 762                return;
 763
 764        sdata->local->csa_channel = new_ch;
 765
 766        if (sdata->local->ops->channel_switch) {
 767                /* use driver's channel switch callback */
 768                struct ieee80211_channel_switch ch_switch;
 769                memset(&ch_switch, 0, sizeof(ch_switch));
 770                ch_switch.timestamp = timestamp;
 771                if (sw_elem->mode) {
 772                        ch_switch.block_tx = true;
 773                        ieee80211_stop_queues_by_reason(&sdata->local->hw,
 774                                        IEEE80211_QUEUE_STOP_REASON_CSA);
 775                }
 776                ch_switch.channel = new_ch;
 777                ch_switch.count = sw_elem->count;
 778                ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 779                drv_channel_switch(sdata->local, &ch_switch);
 780                return;
 781        }
 782
 783        /* channel switch handled in software */
 784        if (sw_elem->count <= 1) {
 785                ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 786        } else {
 787                if (sw_elem->mode)
 788                        ieee80211_stop_queues_by_reason(&sdata->local->hw,
 789                                        IEEE80211_QUEUE_STOP_REASON_CSA);
 790                ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 791                mod_timer(&ifmgd->chswitch_timer,
 792                          jiffies +
 793                          msecs_to_jiffies(sw_elem->count *
 794                                           cbss->beacon_interval));
 795        }
 796}
 797
 798static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 799                                        u16 capab_info, u8 *pwr_constr_elem,
 800                                        u8 pwr_constr_elem_len)
 801{
 802        struct ieee80211_conf *conf = &sdata->local->hw.conf;
 803
 804        if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 805                return;
 806
 807        /* Power constraint IE length should be 1 octet */
 808        if (pwr_constr_elem_len != 1)
 809                return;
 810
 811        if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 812            (*pwr_constr_elem != sdata->local->power_constr_level)) {
 813                sdata->local->power_constr_level = *pwr_constr_elem;
 814                ieee80211_hw_config(sdata->local, 0);
 815        }
 816}
 817
 818void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 819{
 820        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 821        struct ieee80211_local *local = sdata->local;
 822        struct ieee80211_conf *conf = &local->hw.conf;
 823
 824        WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 825                !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 826                (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 827
 828        local->disable_dynamic_ps = false;
 829        conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 830}
 831EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 832
 833void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 834{
 835        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 836        struct ieee80211_local *local = sdata->local;
 837        struct ieee80211_conf *conf = &local->hw.conf;
 838
 839        WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 840                !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 841                (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 842
 843        local->disable_dynamic_ps = true;
 844        conf->dynamic_ps_timeout = 0;
 845        del_timer_sync(&local->dynamic_ps_timer);
 846        ieee80211_queue_work(&local->hw,
 847                             &local->dynamic_ps_enable_work);
 848}
 849EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 850
 851/* powersave */
 852static void ieee80211_enable_ps(struct ieee80211_local *local,
 853                                struct ieee80211_sub_if_data *sdata)
 854{
 855        struct ieee80211_conf *conf = &local->hw.conf;
 856
 857        /*
 858         * If we are scanning right now then the parameters will
 859         * take effect when scan finishes.
 860         */
 861        if (local->scanning)
 862                return;
 863
 864        if (conf->dynamic_ps_timeout > 0 &&
 865            !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 866                mod_timer(&local->dynamic_ps_timer, jiffies +
 867                          msecs_to_jiffies(conf->dynamic_ps_timeout));
 868        } else {
 869                if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 870                        ieee80211_send_nullfunc(local, sdata, 1);
 871
 872                if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 873                    (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 874                        return;
 875
 876                conf->flags |= IEEE80211_CONF_PS;
 877                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 878        }
 879}
 880
 881static void ieee80211_change_ps(struct ieee80211_local *local)
 882{
 883        struct ieee80211_conf *conf = &local->hw.conf;
 884
 885        if (local->ps_sdata) {
 886                ieee80211_enable_ps(local, local->ps_sdata);
 887        } else if (conf->flags & IEEE80211_CONF_PS) {
 888                conf->flags &= ~IEEE80211_CONF_PS;
 889                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 890                del_timer_sync(&local->dynamic_ps_timer);
 891                cancel_work_sync(&local->dynamic_ps_enable_work);
 892        }
 893}
 894
 895static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 896{
 897        struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 898        struct sta_info *sta = NULL;
 899        bool authorized = false;
 900
 901        if (!mgd->powersave)
 902                return false;
 903
 904        if (mgd->broken_ap)
 905                return false;
 906
 907        if (!mgd->associated)
 908                return false;
 909
 910        if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 911                          IEEE80211_STA_CONNECTION_POLL))
 912                return false;
 913
 914        rcu_read_lock();
 915        sta = sta_info_get(sdata, mgd->bssid);
 916        if (sta)
 917                authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 918        rcu_read_unlock();
 919
 920        return authorized;
 921}
 922
 923/* need to hold RTNL or interface lock */
 924void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 925{
 926        struct ieee80211_sub_if_data *sdata, *found = NULL;
 927        int count = 0;
 928        int timeout;
 929
 930        if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 931                local->ps_sdata = NULL;
 932                return;
 933        }
 934
 935        list_for_each_entry(sdata, &local->interfaces, list) {
 936                if (!ieee80211_sdata_running(sdata))
 937                        continue;
 938                if (sdata->vif.type == NL80211_IFTYPE_AP) {
 939                        /* If an AP vif is found, then disable PS
 940                         * by setting the count to zero thereby setting
 941                         * ps_sdata to NULL.
 942                         */
 943                        count = 0;
 944                        break;
 945                }
 946                if (sdata->vif.type != NL80211_IFTYPE_STATION)
 947                        continue;
 948                found = sdata;
 949                count++;
 950        }
 951
 952        if (count == 1 && ieee80211_powersave_allowed(found)) {
 953                struct ieee80211_conf *conf = &local->hw.conf;
 954                s32 beaconint_us;
 955
 956                if (latency < 0)
 957                        latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 958
 959                beaconint_us = ieee80211_tu_to_usec(
 960                                        found->vif.bss_conf.beacon_int);
 961
 962                timeout = local->dynamic_ps_forced_timeout;
 963                if (timeout < 0) {
 964                        /*
 965                         * Go to full PSM if the user configures a very low
 966                         * latency requirement.
 967                         * The 2000 second value is there for compatibility
 968                         * until the PM_QOS_NETWORK_LATENCY is configured
 969                         * with real values.
 970                         */
 971                        if (latency > (1900 * USEC_PER_MSEC) &&
 972                            latency != (2000 * USEC_PER_SEC))
 973                                timeout = 0;
 974                        else
 975                                timeout = 100;
 976                }
 977                local->dynamic_ps_user_timeout = timeout;
 978                if (!local->disable_dynamic_ps)
 979                        conf->dynamic_ps_timeout =
 980                                local->dynamic_ps_user_timeout;
 981
 982                if (beaconint_us > latency) {
 983                        local->ps_sdata = NULL;
 984                } else {
 985                        struct ieee80211_bss *bss;
 986                        int maxslp = 1;
 987                        u8 dtimper;
 988
 989                        bss = (void *)found->u.mgd.associated->priv;
 990                        dtimper = bss->dtim_period;
 991
 992                        /* If the TIM IE is invalid, pretend the value is 1 */
 993                        if (!dtimper)
 994                                dtimper = 1;
 995                        else if (dtimper > 1)
 996                                maxslp = min_t(int, dtimper,
 997                                                    latency / beaconint_us);
 998
 999                        local->hw.conf.max_sleep_period = maxslp;
1000                        local->hw.conf.ps_dtim_period = dtimper;
1001                        local->ps_sdata = found;
1002                }
1003        } else {
1004                local->ps_sdata = NULL;
1005        }
1006
1007        ieee80211_change_ps(local);
1008}
1009
1010void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1011{
1012        struct ieee80211_local *local =
1013                container_of(work, struct ieee80211_local,
1014                             dynamic_ps_disable_work);
1015
1016        if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1017                local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1018                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1019        }
1020
1021        ieee80211_wake_queues_by_reason(&local->hw,
1022                                        IEEE80211_QUEUE_STOP_REASON_PS);
1023}
1024
1025void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1026{
1027        struct ieee80211_local *local =
1028                container_of(work, struct ieee80211_local,
1029                             dynamic_ps_enable_work);
1030        struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1031        struct ieee80211_if_managed *ifmgd;
1032        unsigned long flags;
1033        int q;
1034
1035        /* can only happen when PS was just disabled anyway */
1036        if (!sdata)
1037                return;
1038
1039        ifmgd = &sdata->u.mgd;
1040
1041        if (local->hw.conf.flags & IEEE80211_CONF_PS)
1042                return;
1043
1044        if (!local->disable_dynamic_ps &&
1045            local->hw.conf.dynamic_ps_timeout > 0) {
1046                /* don't enter PS if TX frames are pending */
1047                if (drv_tx_frames_pending(local)) {
1048                        mod_timer(&local->dynamic_ps_timer, jiffies +
1049                                  msecs_to_jiffies(
1050                                  local->hw.conf.dynamic_ps_timeout));
1051                        return;
1052                }
1053
1054                /*
1055                 * transmission can be stopped by others which leads to
1056                 * dynamic_ps_timer expiry. Postpone the ps timer if it
1057                 * is not the actual idle state.
1058                 */
1059                spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1060                for (q = 0; q < local->hw.queues; q++) {
1061                        if (local->queue_stop_reasons[q]) {
1062                                spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1063                                                       flags);
1064                                mod_timer(&local->dynamic_ps_timer, jiffies +
1065                                          msecs_to_jiffies(
1066                                          local->hw.conf.dynamic_ps_timeout));
1067                                return;
1068                        }
1069                }
1070                spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1071        }
1072
1073        if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1074            !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1075                netif_tx_stop_all_queues(sdata->dev);
1076
1077                if (drv_tx_frames_pending(local))
1078                        mod_timer(&local->dynamic_ps_timer, jiffies +
1079                                  msecs_to_jiffies(
1080                                  local->hw.conf.dynamic_ps_timeout));
1081                else {
1082                        ieee80211_send_nullfunc(local, sdata, 1);
1083                        /* Flush to get the tx status of nullfunc frame */
1084                        drv_flush(local, false);
1085                }
1086        }
1087
1088        if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1089              (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1090            (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1091                ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1092                local->hw.conf.flags |= IEEE80211_CONF_PS;
1093                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1094        }
1095
1096        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1097                netif_tx_wake_all_queues(sdata->dev);
1098}
1099
1100void ieee80211_dynamic_ps_timer(unsigned long data)
1101{
1102        struct ieee80211_local *local = (void *) data;
1103
1104        if (local->quiescing || local->suspended)
1105                return;
1106
1107        ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1108}
1109
1110/* MLME */
1111static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1112                                     struct ieee80211_sub_if_data *sdata,
1113                                     u8 *wmm_param, size_t wmm_param_len)
1114{
1115        struct ieee80211_tx_queue_params params;
1116        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1117        size_t left;
1118        int count;
1119        u8 *pos, uapsd_queues = 0;
1120
1121        if (!local->ops->conf_tx)
1122                return false;
1123
1124        if (local->hw.queues < IEEE80211_NUM_ACS)
1125                return false;
1126
1127        if (!wmm_param)
1128                return false;
1129
1130        if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1131                return false;
1132
1133        if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1134                uapsd_queues = ifmgd->uapsd_queues;
1135
1136        count = wmm_param[6] & 0x0f;
1137        if (count == ifmgd->wmm_last_param_set)
1138                return false;
1139        ifmgd->wmm_last_param_set = count;
1140
1141        pos = wmm_param + 8;
1142        left = wmm_param_len - 8;
1143
1144        memset(&params, 0, sizeof(params));
1145
1146        sdata->wmm_acm = 0;
1147        for (; left >= 4; left -= 4, pos += 4) {
1148                int aci = (pos[0] >> 5) & 0x03;
1149                int acm = (pos[0] >> 4) & 0x01;
1150                bool uapsd = false;
1151                int queue;
1152
1153                switch (aci) {
1154                case 1: /* AC_BK */
1155                        queue = 3;
1156                        if (acm)
1157                                sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1158                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1159                                uapsd = true;
1160                        break;
1161                case 2: /* AC_VI */
1162                        queue = 1;
1163                        if (acm)
1164                                sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1165                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1166                                uapsd = true;
1167                        break;
1168                case 3: /* AC_VO */
1169                        queue = 0;
1170                        if (acm)
1171                                sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1172                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1173                                uapsd = true;
1174                        break;
1175                case 0: /* AC_BE */
1176                default:
1177                        queue = 2;
1178                        if (acm)
1179                                sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1180                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1181                                uapsd = true;
1182                        break;
1183                }
1184
1185                params.aifs = pos[0] & 0x0f;
1186                params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1187                params.cw_min = ecw2cw(pos[1] & 0x0f);
1188                params.txop = get_unaligned_le16(pos + 2);
1189                params.uapsd = uapsd;
1190
1191                mlme_dbg(sdata,
1192                         "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1193                         queue, aci, acm,
1194                         params.aifs, params.cw_min, params.cw_max,
1195                         params.txop, params.uapsd);
1196                sdata->tx_conf[queue] = params;
1197                if (drv_conf_tx(local, sdata, queue, &params))
1198                        sdata_err(sdata,
1199                                  "failed to set TX queue parameters for queue %d\n",
1200                                  queue);
1201        }
1202
1203        /* enable WMM or activate new settings */
1204        sdata->vif.bss_conf.qos = true;
1205        return true;
1206}
1207
1208static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1209{
1210        lockdep_assert_held(&sdata->local->mtx);
1211
1212        sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1213                                IEEE80211_STA_BEACON_POLL);
1214        ieee80211_run_deferred_scan(sdata->local);
1215}
1216
1217static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1218{
1219        mutex_lock(&sdata->local->mtx);
1220        __ieee80211_stop_poll(sdata);
1221        mutex_unlock(&sdata->local->mtx);
1222}
1223
1224static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1225                                           u16 capab, bool erp_valid, u8 erp)
1226{
1227        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1228        u32 changed = 0;
1229        bool use_protection;
1230        bool use_short_preamble;
1231        bool use_short_slot;
1232
1233        if (erp_valid) {
1234                use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1235                use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1236        } else {
1237                use_protection = false;
1238                use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1239        }
1240
1241        use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1242        if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1243                use_short_slot = true;
1244
1245        if (use_protection != bss_conf->use_cts_prot) {
1246                bss_conf->use_cts_prot = use_protection;
1247                changed |= BSS_CHANGED_ERP_CTS_PROT;
1248        }
1249
1250        if (use_short_preamble != bss_conf->use_short_preamble) {
1251                bss_conf->use_short_preamble = use_short_preamble;
1252                changed |= BSS_CHANGED_ERP_PREAMBLE;
1253        }
1254
1255        if (use_short_slot != bss_conf->use_short_slot) {
1256                bss_conf->use_short_slot = use_short_slot;
1257                changed |= BSS_CHANGED_ERP_SLOT;
1258        }
1259
1260        return changed;
1261}
1262
1263static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1264                                     struct cfg80211_bss *cbss,
1265                                     u32 bss_info_changed)
1266{
1267        struct ieee80211_bss *bss = (void *)cbss->priv;
1268        struct ieee80211_local *local = sdata->local;
1269        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1270
1271        bss_info_changed |= BSS_CHANGED_ASSOC;
1272        bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1273                bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1274
1275        sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1276                IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1277
1278        sdata->u.mgd.associated = cbss;
1279        memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1280
1281        sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1282
1283        /* just to be sure */
1284        ieee80211_stop_poll(sdata);
1285
1286        ieee80211_led_assoc(local, 1);
1287
1288        if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1289                bss_conf->dtim_period = bss->dtim_period;
1290        else
1291                bss_conf->dtim_period = 0;
1292
1293        bss_conf->assoc = 1;
1294
1295        /* Tell the driver to monitor connection quality (if supported) */
1296        if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1297            bss_conf->cqm_rssi_thold)
1298                bss_info_changed |= BSS_CHANGED_CQM;
1299
1300        /* Enable ARP filtering */
1301        if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1302                bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1303                bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1304        }
1305
1306        ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1307
1308        mutex_lock(&local->iflist_mtx);
1309        ieee80211_recalc_ps(local, -1);
1310        ieee80211_recalc_smps(local);
1311        mutex_unlock(&local->iflist_mtx);
1312
1313        netif_tx_start_all_queues(sdata->dev);
1314        netif_carrier_on(sdata->dev);
1315}
1316
1317static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1318                                   u16 stype, u16 reason, bool tx,
1319                                   u8 *frame_buf)
1320{
1321        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1322        struct ieee80211_local *local = sdata->local;
1323        struct sta_info *sta;
1324        u32 changed = 0;
1325
1326        ASSERT_MGD_MTX(ifmgd);
1327
1328        if (WARN_ON_ONCE(tx && !frame_buf))
1329                return;
1330
1331        if (WARN_ON(!ifmgd->associated))
1332                return;
1333
1334        ieee80211_stop_poll(sdata);
1335
1336        ifmgd->associated = NULL;
1337
1338        /*
1339         * we need to commit the associated = NULL change because the
1340         * scan code uses that to determine whether this iface should
1341         * go to/wake up from powersave or not -- and could otherwise
1342         * wake the queues erroneously.
1343         */
1344        smp_mb();
1345
1346        /*
1347         * Thus, we can only afterwards stop the queues -- to account
1348         * for the case where another CPU is finishing a scan at this
1349         * time -- we don't want the scan code to enable queues.
1350         */
1351
1352        netif_tx_stop_all_queues(sdata->dev);
1353        netif_carrier_off(sdata->dev);
1354
1355        mutex_lock(&local->sta_mtx);
1356        sta = sta_info_get(sdata, ifmgd->bssid);
1357        if (sta) {
1358                set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1359                ieee80211_sta_tear_down_BA_sessions(sta, tx);
1360        }
1361        mutex_unlock(&local->sta_mtx);
1362
1363        /*
1364         * if we want to get out of ps before disassoc (why?) we have
1365         * to do it before sending disassoc, as otherwise the null-packet
1366         * won't be valid.
1367         */
1368        if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1369                local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1370                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1371        }
1372        local->ps_sdata = NULL;
1373
1374        /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1375        if (tx)
1376                drv_flush(local, false);
1377
1378        /* deauthenticate/disassociate now */
1379        if (tx || frame_buf)
1380                ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1381                                               reason, tx, frame_buf);
1382
1383        /* flush out frame */
1384        if (tx)
1385                drv_flush(local, false);
1386
1387        /* clear bssid only after building the needed mgmt frames */
1388        memset(ifmgd->bssid, 0, ETH_ALEN);
1389
1390        /* remove AP and TDLS peers */
1391        sta_info_flush(local, sdata);
1392
1393        /* finally reset all BSS / config parameters */
1394        changed |= ieee80211_reset_erp_info(sdata);
1395
1396        ieee80211_led_assoc(local, 0);
1397        changed |= BSS_CHANGED_ASSOC;
1398        sdata->vif.bss_conf.assoc = false;
1399
1400        /* on the next assoc, re-program HT parameters */
1401        memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1402        memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1403
1404        local->power_constr_level = 0;
1405
1406        del_timer_sync(&local->dynamic_ps_timer);
1407        cancel_work_sync(&local->dynamic_ps_enable_work);
1408
1409        /* Disable ARP filtering */
1410        if (sdata->vif.bss_conf.arp_filter_enabled) {
1411                sdata->vif.bss_conf.arp_filter_enabled = false;
1412                changed |= BSS_CHANGED_ARP_FILTER;
1413        }
1414
1415        sdata->vif.bss_conf.qos = false;
1416        changed |= BSS_CHANGED_QOS;
1417
1418        /* The BSSID (not really interesting) and HT changed */
1419        changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1420        ieee80211_bss_info_change_notify(sdata, changed);
1421
1422        /* channel(_type) changes are handled by ieee80211_hw_config */
1423        WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1424        ieee80211_hw_config(local, 0);
1425
1426        /* disassociated - set to defaults now */
1427        ieee80211_set_wmm_default(sdata, false);
1428
1429        del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1430        del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1431        del_timer_sync(&sdata->u.mgd.timer);
1432        del_timer_sync(&sdata->u.mgd.chswitch_timer);
1433
1434        sdata->u.mgd.timers_running = 0;
1435}
1436
1437void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1438                             struct ieee80211_hdr *hdr)
1439{
1440        /*
1441         * We can postpone the mgd.timer whenever receiving unicast frames
1442         * from AP because we know that the connection is working both ways
1443         * at that time. But multicast frames (and hence also beacons) must
1444         * be ignored here, because we need to trigger the timer during
1445         * data idle periods for sending the periodic probe request to the
1446         * AP we're connected to.
1447         */
1448        if (is_multicast_ether_addr(hdr->addr1))
1449                return;
1450
1451        ieee80211_sta_reset_conn_monitor(sdata);
1452}
1453
1454static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1455{
1456        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1457        struct ieee80211_local *local = sdata->local;
1458
1459        mutex_lock(&local->mtx);
1460        if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1461                              IEEE80211_STA_CONNECTION_POLL))) {
1462                mutex_unlock(&local->mtx);
1463                return;
1464        }
1465
1466        __ieee80211_stop_poll(sdata);
1467
1468        mutex_lock(&local->iflist_mtx);
1469        ieee80211_recalc_ps(local, -1);
1470        mutex_unlock(&local->iflist_mtx);
1471
1472        if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1473                goto out;
1474
1475        /*
1476         * We've received a probe response, but are not sure whether
1477         * we have or will be receiving any beacons or data, so let's
1478         * schedule the timers again, just in case.
1479         */
1480        ieee80211_sta_reset_beacon_monitor(sdata);
1481
1482        mod_timer(&ifmgd->conn_mon_timer,
1483                  round_jiffies_up(jiffies +
1484                                   IEEE80211_CONNECTION_IDLE_TIME));
1485out:
1486        mutex_unlock(&local->mtx);
1487}
1488
1489void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1490                             struct ieee80211_hdr *hdr, bool ack)
1491{
1492        if (!ieee80211_is_data(hdr->frame_control))
1493            return;
1494
1495        if (ack)
1496                ieee80211_sta_reset_conn_monitor(sdata);
1497
1498        if (ieee80211_is_nullfunc(hdr->frame_control) &&
1499            sdata->u.mgd.probe_send_count > 0) {
1500                if (ack)
1501                        sdata->u.mgd.probe_send_count = 0;
1502                else
1503                        sdata->u.mgd.nullfunc_failed = true;
1504                ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1505        }
1506}
1507
1508static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1509{
1510        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1511        const u8 *ssid;
1512        u8 *dst = ifmgd->associated->bssid;
1513        u8 unicast_limit = max(1, max_probe_tries - 3);
1514
1515        /*
1516         * Try sending broadcast probe requests for the last three
1517         * probe requests after the first ones failed since some
1518         * buggy APs only support broadcast probe requests.
1519         */
1520        if (ifmgd->probe_send_count >= unicast_limit)
1521                dst = NULL;
1522
1523        /*
1524         * When the hardware reports an accurate Tx ACK status, it's
1525         * better to send a nullfunc frame instead of a probe request,
1526         * as it will kick us off the AP quickly if we aren't associated
1527         * anymore. The timeout will be reset if the frame is ACKed by
1528         * the AP.
1529         */
1530        ifmgd->probe_send_count++;
1531
1532        if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1533                ifmgd->nullfunc_failed = false;
1534                ieee80211_send_nullfunc(sdata->local, sdata, 0);
1535        } else {
1536                int ssid_len;
1537
1538                ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1539                if (WARN_ON_ONCE(ssid == NULL))
1540                        ssid_len = 0;
1541                else
1542                        ssid_len = ssid[1];
1543
1544                ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1545                                         0, (u32) -1, true, false);
1546        }
1547
1548        ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1549        run_again(ifmgd, ifmgd->probe_timeout);
1550        if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1551                drv_flush(sdata->local, false);
1552}
1553
1554static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1555                                   bool beacon)
1556{
1557        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1558        bool already = false;
1559
1560        if (!ieee80211_sdata_running(sdata))
1561                return;
1562
1563        mutex_lock(&ifmgd->mtx);
1564
1565        if (!ifmgd->associated)
1566                goto out;
1567
1568        mutex_lock(&sdata->local->mtx);
1569
1570        if (sdata->local->tmp_channel || sdata->local->scanning) {
1571                mutex_unlock(&sdata->local->mtx);
1572                goto out;
1573        }
1574
1575        if (beacon)
1576                mlme_dbg_ratelimited(sdata,
1577                                     "detected beacon loss from AP - sending probe request\n");
1578
1579        ieee80211_cqm_rssi_notify(&sdata->vif,
1580                NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1581
1582        /*
1583         * The driver/our work has already reported this event or the
1584         * connection monitoring has kicked in and we have already sent
1585         * a probe request. Or maybe the AP died and the driver keeps
1586         * reporting until we disassociate...
1587         *
1588         * In either case we have to ignore the current call to this
1589         * function (except for setting the correct probe reason bit)
1590         * because otherwise we would reset the timer every time and
1591         * never check whether we received a probe response!
1592         */
1593        if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1594                            IEEE80211_STA_CONNECTION_POLL))
1595                already = true;
1596
1597        if (beacon)
1598                ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1599        else
1600                ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1601
1602        mutex_unlock(&sdata->local->mtx);
1603
1604        if (already)
1605                goto out;
1606
1607        mutex_lock(&sdata->local->iflist_mtx);
1608        ieee80211_recalc_ps(sdata->local, -1);
1609        mutex_unlock(&sdata->local->iflist_mtx);
1610
1611        ifmgd->probe_send_count = 0;
1612        ieee80211_mgd_probe_ap_send(sdata);
1613 out:
1614        mutex_unlock(&ifmgd->mtx);
1615}
1616
1617struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1618                                          struct ieee80211_vif *vif)
1619{
1620        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1621        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1622        struct cfg80211_bss *cbss;
1623        struct sk_buff *skb;
1624        const u8 *ssid;
1625        int ssid_len;
1626
1627        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1628                return NULL;
1629
1630        ASSERT_MGD_MTX(ifmgd);
1631
1632        if (ifmgd->associated)
1633                cbss = ifmgd->associated;
1634        else if (ifmgd->auth_data)
1635                cbss = ifmgd->auth_data->bss;
1636        else if (ifmgd->assoc_data)
1637                cbss = ifmgd->assoc_data->bss;
1638        else
1639                return NULL;
1640
1641        ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1642        if (WARN_ON_ONCE(ssid == NULL))
1643                ssid_len = 0;
1644        else
1645                ssid_len = ssid[1];
1646
1647        skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1648                                        (u32) -1, ssid + 2, ssid_len,
1649                                        NULL, 0, true);
1650
1651        return skb;
1652}
1653EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1654
1655static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1656{
1657        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1658        struct ieee80211_local *local = sdata->local;
1659        u8 bssid[ETH_ALEN];
1660        u8 frame_buf[DEAUTH_DISASSOC_LEN];
1661
1662        mutex_lock(&ifmgd->mtx);
1663        if (!ifmgd->associated) {
1664                mutex_unlock(&ifmgd->mtx);
1665                return;
1666        }
1667
1668        memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1669
1670        sdata_info(sdata, "Connection to AP %pM lost\n", bssid);
1671
1672        ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1673                               WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1674                               false, frame_buf);
1675        mutex_unlock(&ifmgd->mtx);
1676
1677        /*
1678         * must be outside lock due to cfg80211,
1679         * but that's not a problem.
1680         */
1681        cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1682
1683        mutex_lock(&local->mtx);
1684        ieee80211_recalc_idle(local);
1685        mutex_unlock(&local->mtx);
1686}
1687
1688void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1689{
1690        struct ieee80211_sub_if_data *sdata =
1691                container_of(work, struct ieee80211_sub_if_data,
1692                             u.mgd.beacon_connection_loss_work);
1693        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1694        struct sta_info *sta;
1695
1696        if (ifmgd->associated) {
1697                rcu_read_lock();
1698                sta = sta_info_get(sdata, ifmgd->bssid);
1699                if (sta)
1700                        sta->beacon_loss_count++;
1701                rcu_read_unlock();
1702        }
1703
1704        if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1705                __ieee80211_connection_loss(sdata);
1706        else
1707                ieee80211_mgd_probe_ap(sdata, true);
1708}
1709
1710void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1711{
1712        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1713        struct ieee80211_hw *hw = &sdata->local->hw;
1714
1715        trace_api_beacon_loss(sdata);
1716
1717        WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1718        ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1719}
1720EXPORT_SYMBOL(ieee80211_beacon_loss);
1721
1722void ieee80211_connection_loss(struct ieee80211_vif *vif)
1723{
1724        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1725        struct ieee80211_hw *hw = &sdata->local->hw;
1726
1727        trace_api_connection_loss(sdata);
1728
1729        WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1730        ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1731}
1732EXPORT_SYMBOL(ieee80211_connection_loss);
1733
1734
1735static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1736                                        bool assoc)
1737{
1738        struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1739
1740        lockdep_assert_held(&sdata->u.mgd.mtx);
1741
1742        if (!assoc) {
1743                sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1744
1745                memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1746                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1747        }
1748
1749        cfg80211_put_bss(auth_data->bss);
1750        kfree(auth_data);
1751        sdata->u.mgd.auth_data = NULL;
1752}
1753
1754static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1755                                     struct ieee80211_mgmt *mgmt, size_t len)
1756{
1757        struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1758        u8 *pos;
1759        struct ieee802_11_elems elems;
1760
1761        pos = mgmt->u.auth.variable;
1762        ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1763        if (!elems.challenge)
1764                return;
1765        auth_data->expected_transaction = 4;
1766        drv_mgd_prepare_tx(sdata->local, sdata);
1767        ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1768                            elems.challenge - 2, elems.challenge_len + 2,
1769                            auth_data->bss->bssid, auth_data->bss->bssid,
1770                            auth_data->key, auth_data->key_len,
1771                            auth_data->key_idx);
1772}
1773
1774static enum rx_mgmt_action __must_check
1775ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1776                       struct ieee80211_mgmt *mgmt, size_t len)
1777{
1778        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1779        u8 bssid[ETH_ALEN];
1780        u16 auth_alg, auth_transaction, status_code;
1781        struct sta_info *sta;
1782
1783        lockdep_assert_held(&ifmgd->mtx);
1784
1785        if (len < 24 + 6)
1786                return RX_MGMT_NONE;
1787
1788        if (!ifmgd->auth_data || ifmgd->auth_data->done)
1789                return RX_MGMT_NONE;
1790
1791        memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1792
1793        if (!ether_addr_equal(bssid, mgmt->bssid))
1794                return RX_MGMT_NONE;
1795
1796        auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1797        auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1798        status_code = le16_to_cpu(mgmt->u.auth.status_code);
1799
1800        if (auth_alg != ifmgd->auth_data->algorithm ||
1801            auth_transaction != ifmgd->auth_data->expected_transaction)
1802                return RX_MGMT_NONE;
1803
1804        if (status_code != WLAN_STATUS_SUCCESS) {
1805                sdata_info(sdata, "%pM denied authentication (status %d)\n",
1806                           mgmt->sa, status_code);
1807                ieee80211_destroy_auth_data(sdata, false);
1808                return RX_MGMT_CFG80211_RX_AUTH;
1809        }
1810
1811        switch (ifmgd->auth_data->algorithm) {
1812        case WLAN_AUTH_OPEN:
1813        case WLAN_AUTH_LEAP:
1814        case WLAN_AUTH_FT:
1815                break;
1816        case WLAN_AUTH_SHARED_KEY:
1817                if (ifmgd->auth_data->expected_transaction != 4) {
1818                        ieee80211_auth_challenge(sdata, mgmt, len);
1819                        /* need another frame */
1820                        return RX_MGMT_NONE;
1821                }
1822                break;
1823        default:
1824                WARN_ONCE(1, "invalid auth alg %d",
1825                          ifmgd->auth_data->algorithm);
1826                return RX_MGMT_NONE;
1827        }
1828
1829        sdata_info(sdata, "authenticated\n");
1830        ifmgd->auth_data->done = true;
1831        ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1832        run_again(ifmgd, ifmgd->auth_data->timeout);
1833
1834        /* move station state to auth */
1835        mutex_lock(&sdata->local->sta_mtx);
1836        sta = sta_info_get(sdata, bssid);
1837        if (!sta) {
1838                WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1839                goto out_err;
1840        }
1841        if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1842                sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1843                goto out_err;
1844        }
1845        mutex_unlock(&sdata->local->sta_mtx);
1846
1847        return RX_MGMT_CFG80211_RX_AUTH;
1848 out_err:
1849        mutex_unlock(&sdata->local->sta_mtx);
1850        /* ignore frame -- wait for timeout */
1851        return RX_MGMT_NONE;
1852}
1853
1854
1855static enum rx_mgmt_action __must_check
1856ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1857                         struct ieee80211_mgmt *mgmt, size_t len)
1858{
1859        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1860        const u8 *bssid = NULL;
1861        u16 reason_code;
1862
1863        lockdep_assert_held(&ifmgd->mtx);
1864
1865        if (len < 24 + 2)
1866                return RX_MGMT_NONE;
1867
1868        if (!ifmgd->associated ||
1869            !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1870                return RX_MGMT_NONE;
1871
1872        bssid = ifmgd->associated->bssid;
1873
1874        reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1875
1876        sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1877                   bssid, reason_code);
1878
1879        ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1880
1881        mutex_lock(&sdata->local->mtx);
1882        ieee80211_recalc_idle(sdata->local);
1883        mutex_unlock(&sdata->local->mtx);
1884
1885        return RX_MGMT_CFG80211_DEAUTH;
1886}
1887
1888
1889static enum rx_mgmt_action __must_check
1890ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1891                           struct ieee80211_mgmt *mgmt, size_t len)
1892{
1893        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1894        u16 reason_code;
1895
1896        lockdep_assert_held(&ifmgd->mtx);
1897
1898        if (len < 24 + 2)
1899                return RX_MGMT_NONE;
1900
1901        if (!ifmgd->associated ||
1902            !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1903                return RX_MGMT_NONE;
1904
1905        reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1906
1907        sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1908                   mgmt->sa, reason_code);
1909
1910        ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1911
1912        mutex_lock(&sdata->local->mtx);
1913        ieee80211_recalc_idle(sdata->local);
1914        mutex_unlock(&sdata->local->mtx);
1915
1916        return RX_MGMT_CFG80211_DISASSOC;
1917}
1918
1919static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1920                                u8 *supp_rates, unsigned int supp_rates_len,
1921                                u32 *rates, u32 *basic_rates,
1922                                bool *have_higher_than_11mbit,
1923                                int *min_rate, int *min_rate_index)
1924{
1925        int i, j;
1926
1927        for (i = 0; i < supp_rates_len; i++) {
1928                int rate = (supp_rates[i] & 0x7f) * 5;
1929                bool is_basic = !!(supp_rates[i] & 0x80);
1930
1931                if (rate > 110)
1932                        *have_higher_than_11mbit = true;
1933
1934                /*
1935                 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1936                 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1937                 *
1938                 * Note: Even through the membership selector and the basic
1939                 *       rate flag share the same bit, they are not exactly
1940                 *       the same.
1941                 */
1942                if (!!(supp_rates[i] & 0x80) &&
1943                    (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1944                        continue;
1945
1946                for (j = 0; j < sband->n_bitrates; j++) {
1947                        if (sband->bitrates[j].bitrate == rate) {
1948                                *rates |= BIT(j);
1949                                if (is_basic)
1950                                        *basic_rates |= BIT(j);
1951                                if (rate < *min_rate) {
1952                                        *min_rate = rate;
1953                                        *min_rate_index = j;
1954                                }
1955                                break;
1956                        }
1957                }
1958        }
1959}
1960
1961static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1962                                         bool assoc)
1963{
1964        struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1965
1966        lockdep_assert_held(&sdata->u.mgd.mtx);
1967
1968        if (!assoc) {
1969                sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1970
1971                memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1972                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1973        }
1974
1975        kfree(assoc_data);
1976        sdata->u.mgd.assoc_data = NULL;
1977}
1978
1979static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1980                                    struct cfg80211_bss *cbss,
1981                                    struct ieee80211_mgmt *mgmt, size_t len)
1982{
1983        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1984        struct ieee80211_local *local = sdata->local;
1985        struct ieee80211_supported_band *sband;
1986        struct sta_info *sta;
1987        u8 *pos;
1988        u16 capab_info, aid;
1989        struct ieee802_11_elems elems;
1990        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1991        u32 changed = 0;
1992        int err;
1993
1994        /* AssocResp and ReassocResp have identical structure */
1995
1996        aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1997        capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1998
1999        if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2000                sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2001                           aid);
2002        aid &= ~(BIT(15) | BIT(14));
2003
2004        ifmgd->broken_ap = false;
2005
2006        if (aid == 0 || aid > IEEE80211_MAX_AID) {
2007                sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2008                           aid);
2009                aid = 0;
2010                ifmgd->broken_ap = true;
2011        }
2012
2013        pos = mgmt->u.assoc_resp.variable;
2014        ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2015
2016        if (!elems.supp_rates) {
2017                sdata_info(sdata, "no SuppRates element in AssocResp\n");
2018                return false;
2019        }
2020
2021        ifmgd->aid = aid;
2022
2023        mutex_lock(&sdata->local->sta_mtx);
2024        /*
2025         * station info was already allocated and inserted before
2026         * the association and should be available to us
2027         */
2028        sta = sta_info_get(sdata, cbss->bssid);
2029        if (WARN_ON(!sta)) {
2030                mutex_unlock(&sdata->local->sta_mtx);
2031                return false;
2032        }
2033
2034        sband = local->hw.wiphy->bands[local->oper_channel->band];
2035
2036        if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2037                ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2038                                elems.ht_cap_elem, &sta->sta.ht_cap);
2039
2040        sta->supports_40mhz =
2041                sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2042
2043        rate_control_rate_init(sta);
2044
2045        if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2046                set_sta_flag(sta, WLAN_STA_MFP);
2047
2048        if (elems.wmm_param)
2049                set_sta_flag(sta, WLAN_STA_WME);
2050
2051        err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2052        if (!err)
2053                err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2054        if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2055                err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2056        if (err) {
2057                sdata_info(sdata,
2058                           "failed to move station %pM to desired state\n",
2059                           sta->sta.addr);
2060                WARN_ON(__sta_info_destroy(sta));
2061                mutex_unlock(&sdata->local->sta_mtx);
2062                return false;
2063        }
2064
2065        mutex_unlock(&sdata->local->sta_mtx);
2066
2067        /*
2068         * Always handle WMM once after association regardless
2069         * of the first value the AP uses. Setting -1 here has
2070         * that effect because the AP values is an unsigned
2071         * 4-bit value.
2072         */
2073        ifmgd->wmm_last_param_set = -1;
2074
2075        if (elems.wmm_param)
2076                ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2077                                         elems.wmm_param_len);
2078        else
2079                ieee80211_set_wmm_default(sdata, false);
2080        changed |= BSS_CHANGED_QOS;
2081
2082        if (elems.ht_operation && elems.wmm_param &&
2083            !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2084                changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2085                                                  cbss->bssid, false);
2086
2087        /* set AID and assoc capability,
2088         * ieee80211_set_associated() will tell the driver */
2089        bss_conf->aid = aid;
2090        bss_conf->assoc_capability = capab_info;
2091        ieee80211_set_associated(sdata, cbss, changed);
2092
2093        /*
2094         * If we're using 4-addr mode, let the AP know that we're
2095         * doing so, so that it can create the STA VLAN on its side
2096         */
2097        if (ifmgd->use_4addr)
2098                ieee80211_send_4addr_nullfunc(local, sdata);
2099
2100        /*
2101         * Start timer to probe the connection to the AP now.
2102         * Also start the timer that will detect beacon loss.
2103         */
2104        ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2105        ieee80211_sta_reset_beacon_monitor(sdata);
2106
2107        return true;
2108}
2109
2110static enum rx_mgmt_action __must_check
2111ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2112                             struct ieee80211_mgmt *mgmt, size_t len,
2113                             struct cfg80211_bss **bss)
2114{
2115        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2116        struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2117        u16 capab_info, status_code, aid;
2118        struct ieee802_11_elems elems;
2119        u8 *pos;
2120        bool reassoc;
2121
2122        lockdep_assert_held(&ifmgd->mtx);
2123
2124        if (!assoc_data)
2125                return RX_MGMT_NONE;
2126        if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2127                return RX_MGMT_NONE;
2128
2129        /*
2130         * AssocResp and ReassocResp have identical structure, so process both
2131         * of them in this function.
2132         */
2133
2134        if (len < 24 + 6)
2135                return RX_MGMT_NONE;
2136
2137        reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2138        capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2139        status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2140        aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2141
2142        sdata_info(sdata,
2143                   "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2144                   reassoc ? "Rea" : "A", mgmt->sa,
2145                   capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2146
2147        pos = mgmt->u.assoc_resp.variable;
2148        ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2149
2150        if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2151            elems.timeout_int && elems.timeout_int_len == 5 &&
2152            elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2153                u32 tu, ms;
2154                tu = get_unaligned_le32(elems.timeout_int + 1);
2155                ms = tu * 1024 / 1000;
2156                sdata_info(sdata,
2157                           "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2158                           mgmt->sa, tu, ms);
2159                assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2160                if (ms > IEEE80211_ASSOC_TIMEOUT)
2161                        run_again(ifmgd, assoc_data->timeout);
2162                return RX_MGMT_NONE;
2163        }
2164
2165        *bss = assoc_data->bss;
2166
2167        if (status_code != WLAN_STATUS_SUCCESS) {
2168                sdata_info(sdata, "%pM denied association (code=%d)\n",
2169                           mgmt->sa, status_code);
2170                ieee80211_destroy_assoc_data(sdata, false);
2171        } else {
2172                if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2173                        /* oops -- internal error -- send timeout for now */
2174                        ieee80211_destroy_assoc_data(sdata, false);
2175                        cfg80211_put_bss(*bss);
2176                        return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2177                }
2178                sdata_info(sdata, "associated\n");
2179
2180                /*
2181                 * destroy assoc_data afterwards, as otherwise an idle
2182                 * recalc after assoc_data is NULL but before associated
2183                 * is set can cause the interface to go idle
2184                 */
2185                ieee80211_destroy_assoc_data(sdata, true);
2186        }
2187
2188        return RX_MGMT_CFG80211_RX_ASSOC;
2189}
2190static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2191                                  struct ieee80211_mgmt *mgmt,
2192                                  size_t len,
2193                                  struct ieee80211_rx_status *rx_status,
2194                                  struct ieee802_11_elems *elems,
2195                                  bool beacon)
2196{
2197        struct ieee80211_local *local = sdata->local;
2198        int freq;
2199        struct ieee80211_bss *bss;
2200        struct ieee80211_channel *channel;
2201        bool need_ps = false;
2202
2203        if (sdata->u.mgd.associated &&
2204            ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2205                bss = (void *)sdata->u.mgd.associated->priv;
2206                /* not previously set so we may need to recalc */
2207                need_ps = !bss->dtim_period;
2208        }
2209
2210        if (elems->ds_params && elems->ds_params_len == 1)
2211                freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2212                                                      rx_status->band);
2213        else
2214                freq = rx_status->freq;
2215
2216        channel = ieee80211_get_channel(local->hw.wiphy, freq);
2217
2218        if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2219                return;
2220
2221        bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2222                                        channel, beacon);
2223        if (bss)
2224                ieee80211_rx_bss_put(local, bss);
2225
2226        if (!sdata->u.mgd.associated)
2227                return;
2228
2229        if (need_ps) {
2230                mutex_lock(&local->iflist_mtx);
2231                ieee80211_recalc_ps(local, -1);
2232                mutex_unlock(&local->iflist_mtx);
2233        }
2234
2235        if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2236            (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2237                                                        ETH_ALEN) == 0)) {
2238                struct ieee80211_channel_sw_ie *sw_elem =
2239                        (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2240                ieee80211_sta_process_chanswitch(sdata, sw_elem,
2241                                                 bss, rx_status->mactime);
2242        }
2243}
2244
2245
2246static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2247                                         struct sk_buff *skb)
2248{
2249        struct ieee80211_mgmt *mgmt = (void *)skb->data;
2250        struct ieee80211_if_managed *ifmgd;
2251        struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2252        size_t baselen, len = skb->len;
2253        struct ieee802_11_elems elems;
2254
2255        ifmgd = &sdata->u.mgd;
2256
2257        ASSERT_MGD_MTX(ifmgd);
2258
2259        if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2260                return; /* ignore ProbeResp to foreign address */
2261
2262        baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2263        if (baselen > len)
2264                return;
2265
2266        ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2267                                &elems);
2268
2269        ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2270
2271        if (ifmgd->associated &&
2272            ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2273                ieee80211_reset_ap_probe(sdata);
2274
2275        if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2276            ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2277                /* got probe response, continue with auth */
2278                sdata_info(sdata, "direct probe responded\n");
2279                ifmgd->auth_data->tries = 0;
2280                ifmgd->auth_data->timeout = jiffies;
2281                run_again(ifmgd, ifmgd->auth_data->timeout);
2282        }
2283}
2284
2285/*
2286 * This is the canonical list of information elements we care about,
2287 * the filter code also gives us all changes to the Microsoft OUI
2288 * (00:50:F2) vendor IE which is used for WMM which we need to track.
2289 *
2290 * We implement beacon filtering in software since that means we can
2291 * avoid processing the frame here and in cfg80211, and userspace
2292 * will not be able to tell whether the hardware supports it or not.
2293 *
2294 * XXX: This list needs to be dynamic -- userspace needs to be able to
2295 *      add items it requires. It also needs to be able to tell us to
2296 *      look out for other vendor IEs.
2297 */
2298static const u64 care_about_ies =
2299        (1ULL << WLAN_EID_COUNTRY) |
2300        (1ULL << WLAN_EID_ERP_INFO) |
2301        (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2302        (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2303        (1ULL << WLAN_EID_HT_CAPABILITY) |
2304        (1ULL << WLAN_EID_HT_OPERATION);
2305
2306static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2307                                     struct ieee80211_mgmt *mgmt,
2308                                     size_t len,
2309                                     struct ieee80211_rx_status *rx_status)
2310{
2311        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2312        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2313        size_t baselen;
2314        struct ieee802_11_elems elems;
2315        struct ieee80211_local *local = sdata->local;
2316        u32 changed = 0;
2317        bool erp_valid, directed_tim = false;
2318        u8 erp_value = 0;
2319        u32 ncrc;
2320        u8 *bssid;
2321
2322        lockdep_assert_held(&ifmgd->mtx);
2323
2324        /* Process beacon from the current BSS */
2325        baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2326        if (baselen > len)
2327                return;
2328
2329        if (rx_status->freq != local->hw.conf.channel->center_freq)
2330                return;
2331
2332        if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2333            ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2334                ieee802_11_parse_elems(mgmt->u.beacon.variable,
2335                                       len - baselen, &elems);
2336
2337                ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2338                                      false);
2339                ifmgd->assoc_data->have_beacon = true;
2340                ifmgd->assoc_data->sent_assoc = false;
2341                /* continue assoc process */
2342                ifmgd->assoc_data->timeout = jiffies;
2343                run_again(ifmgd, ifmgd->assoc_data->timeout);
2344                return;
2345        }
2346
2347        if (!ifmgd->associated ||
2348            !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2349                return;
2350        bssid = ifmgd->associated->bssid;
2351
2352        /* Track average RSSI from the Beacon frames of the current AP */
2353        ifmgd->last_beacon_signal = rx_status->signal;
2354        if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2355                ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2356                ifmgd->ave_beacon_signal = rx_status->signal * 16;
2357                ifmgd->last_cqm_event_signal = 0;
2358                ifmgd->count_beacon_signal = 1;
2359                ifmgd->last_ave_beacon_signal = 0;
2360        } else {
2361                ifmgd->ave_beacon_signal =
2362                        (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2363                         (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2364                         ifmgd->ave_beacon_signal) / 16;
2365                ifmgd->count_beacon_signal++;
2366        }
2367
2368        if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2369            ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2370                int sig = ifmgd->ave_beacon_signal;
2371                int last_sig = ifmgd->last_ave_beacon_signal;
2372
2373                /*
2374                 * if signal crosses either of the boundaries, invoke callback
2375                 * with appropriate parameters
2376                 */
2377                if (sig > ifmgd->rssi_max_thold &&
2378                    (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2379                        ifmgd->last_ave_beacon_signal = sig;
2380                        drv_rssi_callback(local, RSSI_EVENT_HIGH);
2381                } else if (sig < ifmgd->rssi_min_thold &&
2382                           (last_sig >= ifmgd->rssi_max_thold ||
2383                           last_sig == 0)) {
2384                        ifmgd->last_ave_beacon_signal = sig;
2385                        drv_rssi_callback(local, RSSI_EVENT_LOW);
2386                }
2387        }
2388
2389        if (bss_conf->cqm_rssi_thold &&
2390            ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2391            !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2392                int sig = ifmgd->ave_beacon_signal / 16;
2393                int last_event = ifmgd->last_cqm_event_signal;
2394                int thold = bss_conf->cqm_rssi_thold;
2395                int hyst = bss_conf->cqm_rssi_hyst;
2396                if (sig < thold &&
2397                    (last_event == 0 || sig < last_event - hyst)) {
2398                        ifmgd->last_cqm_event_signal = sig;
2399                        ieee80211_cqm_rssi_notify(
2400                                &sdata->vif,
2401                                NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2402                                GFP_KERNEL);
2403                } else if (sig > thold &&
2404                           (last_event == 0 || sig > last_event + hyst)) {
2405                        ifmgd->last_cqm_event_signal = sig;
2406                        ieee80211_cqm_rssi_notify(
2407                                &sdata->vif,
2408                                NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2409                                GFP_KERNEL);
2410                }
2411        }
2412
2413        if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2414                mlme_dbg_ratelimited(sdata,
2415                                     "cancelling probereq poll due to a received beacon\n");
2416                mutex_lock(&local->mtx);
2417                ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2418                ieee80211_run_deferred_scan(local);
2419                mutex_unlock(&local->mtx);
2420
2421                mutex_lock(&local->iflist_mtx);
2422                ieee80211_recalc_ps(local, -1);
2423                mutex_unlock(&local->iflist_mtx);
2424        }
2425
2426        /*
2427         * Push the beacon loss detection into the future since
2428         * we are processing a beacon from the AP just now.
2429         */
2430        ieee80211_sta_reset_beacon_monitor(sdata);
2431
2432        ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2433        ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2434                                          len - baselen, &elems,
2435                                          care_about_ies, ncrc);
2436
2437        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2438                directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2439                                                   ifmgd->aid);
2440
2441        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2442                if (directed_tim) {
2443                        if (local->hw.conf.dynamic_ps_timeout > 0) {
2444                                if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2445                                        local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2446                                        ieee80211_hw_config(local,
2447                                                            IEEE80211_CONF_CHANGE_PS);
2448                                }
2449                                ieee80211_send_nullfunc(local, sdata, 0);
2450                        } else if (!local->pspolling && sdata->u.mgd.powersave) {
2451                                local->pspolling = true;
2452
2453                                /*
2454                                 * Here is assumed that the driver will be
2455                                 * able to send ps-poll frame and receive a
2456                                 * response even though power save mode is
2457                                 * enabled, but some drivers might require
2458                                 * to disable power save here. This needs
2459                                 * to be investigated.
2460                                 */
2461                                ieee80211_send_pspoll(local, sdata);
2462                        }
2463                }
2464        }
2465
2466        if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2467                return;
2468        ifmgd->beacon_crc = ncrc;
2469        ifmgd->beacon_crc_valid = true;
2470
2471        ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2472                              true);
2473
2474        if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2475                                     elems.wmm_param_len))
2476                changed |= BSS_CHANGED_QOS;
2477
2478        if (elems.erp_info && elems.erp_info_len >= 1) {
2479                erp_valid = true;
2480                erp_value = elems.erp_info[0];
2481        } else {
2482                erp_valid = false;
2483        }
2484        changed |= ieee80211_handle_bss_capability(sdata,
2485                        le16_to_cpu(mgmt->u.beacon.capab_info),
2486                        erp_valid, erp_value);
2487
2488
2489        if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2490            !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2491                struct ieee80211_supported_band *sband;
2492
2493                sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2494
2495                changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2496                                                  bssid, true);
2497        }
2498
2499        /* Note: country IE parsing is done for us by cfg80211 */
2500        if (elems.country_elem) {
2501                /* TODO: IBSS also needs this */
2502                if (elems.pwr_constr_elem)
2503                        ieee80211_handle_pwr_constr(sdata,
2504                                le16_to_cpu(mgmt->u.probe_resp.capab_info),
2505                                elems.pwr_constr_elem,
2506                                elems.pwr_constr_elem_len);
2507        }
2508
2509        ieee80211_bss_info_change_notify(sdata, changed);
2510}
2511
2512void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2513                                  struct sk_buff *skb)
2514{
2515        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2516        struct ieee80211_rx_status *rx_status;
2517        struct ieee80211_mgmt *mgmt;
2518        struct cfg80211_bss *bss = NULL;
2519        enum rx_mgmt_action rma = RX_MGMT_NONE;
2520        u16 fc;
2521
2522        rx_status = (struct ieee80211_rx_status *) skb->cb;
2523        mgmt = (struct ieee80211_mgmt *) skb->data;
2524        fc = le16_to_cpu(mgmt->frame_control);
2525
2526        mutex_lock(&ifmgd->mtx);
2527
2528        switch (fc & IEEE80211_FCTL_STYPE) {
2529        case IEEE80211_STYPE_BEACON:
2530                ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2531                break;
2532        case IEEE80211_STYPE_PROBE_RESP:
2533                ieee80211_rx_mgmt_probe_resp(sdata, skb);
2534                break;
2535        case IEEE80211_STYPE_AUTH:
2536                rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2537                break;
2538        case IEEE80211_STYPE_DEAUTH:
2539                rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2540                break;
2541        case IEEE80211_STYPE_DISASSOC:
2542                rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2543                break;
2544        case IEEE80211_STYPE_ASSOC_RESP:
2545        case IEEE80211_STYPE_REASSOC_RESP:
2546                rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2547                break;
2548        case IEEE80211_STYPE_ACTION:
2549                switch (mgmt->u.action.category) {
2550                case WLAN_CATEGORY_SPECTRUM_MGMT:
2551                        ieee80211_sta_process_chanswitch(sdata,
2552                                        &mgmt->u.action.u.chan_switch.sw_elem,
2553                                        (void *)ifmgd->associated->priv,
2554                                        rx_status->mactime);
2555                        break;
2556                }
2557        }
2558        mutex_unlock(&ifmgd->mtx);
2559
2560        switch (rma) {
2561        case RX_MGMT_NONE:
2562                /* no action */
2563                break;
2564        case RX_MGMT_CFG80211_DEAUTH:
2565                cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2566                break;
2567        case RX_MGMT_CFG80211_DISASSOC:
2568                cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2569                break;
2570        case RX_MGMT_CFG80211_RX_AUTH:
2571                cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2572                break;
2573        case RX_MGMT_CFG80211_RX_ASSOC:
2574                cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2575                break;
2576        case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2577                cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2578                break;
2579        default:
2580                WARN(1, "unexpected: %d", rma);
2581        }
2582}
2583
2584static void ieee80211_sta_timer(unsigned long data)
2585{
2586        struct ieee80211_sub_if_data *sdata =
2587                (struct ieee80211_sub_if_data *) data;
2588        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2589        struct ieee80211_local *local = sdata->local;
2590
2591        if (local->quiescing) {
2592                set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2593                return;
2594        }
2595
2596        ieee80211_queue_work(&local->hw, &sdata->work);
2597}
2598
2599static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2600                                          u8 *bssid, u8 reason)
2601{
2602        struct ieee80211_local *local = sdata->local;
2603        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2604        u8 frame_buf[DEAUTH_DISASSOC_LEN];
2605
2606        ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2607                               false, frame_buf);
2608        mutex_unlock(&ifmgd->mtx);
2609
2610        /*
2611         * must be outside lock due to cfg80211,
2612         * but that's not a problem.
2613         */
2614        cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2615
2616        mutex_lock(&local->mtx);
2617        ieee80211_recalc_idle(local);
2618        mutex_unlock(&local->mtx);
2619
2620        mutex_lock(&ifmgd->mtx);
2621}
2622
2623static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2624{
2625        struct ieee80211_local *local = sdata->local;
2626        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2627        struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2628
2629        lockdep_assert_held(&ifmgd->mtx);
2630
2631        if (WARN_ON_ONCE(!auth_data))
2632                return -EINVAL;
2633
2634        auth_data->tries++;
2635
2636        if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2637                sdata_info(sdata, "authentication with %pM timed out\n",
2638                           auth_data->bss->bssid);
2639
2640                /*
2641                 * Most likely AP is not in the range so remove the
2642                 * bss struct for that AP.
2643                 */
2644                cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2645
2646                return -ETIMEDOUT;
2647        }
2648
2649        drv_mgd_prepare_tx(local, sdata);
2650
2651        if (auth_data->bss->proberesp_ies) {
2652                sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2653                           auth_data->bss->bssid, auth_data->tries,
2654                           IEEE80211_AUTH_MAX_TRIES);
2655
2656                auth_data->expected_transaction = 2;
2657                ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2658                                    auth_data->ie, auth_data->ie_len,
2659                                    auth_data->bss->bssid,
2660                                    auth_data->bss->bssid, NULL, 0, 0);
2661        } else {
2662                const u8 *ssidie;
2663
2664                sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2665                           auth_data->bss->bssid, auth_data->tries,
2666                           IEEE80211_AUTH_MAX_TRIES);
2667
2668                ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2669                if (!ssidie)
2670                        return -EINVAL;
2671                /*
2672                 * Direct probe is sent to broadcast address as some APs
2673                 * will not answer to direct packet in unassociated state.
2674                 */
2675                ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2676                                         NULL, 0, (u32) -1, true, false);
2677        }
2678
2679        auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2680        run_again(ifmgd, auth_data->timeout);
2681
2682        return 0;
2683}
2684
2685static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2686{
2687        struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2688        struct ieee80211_local *local = sdata->local;
2689
2690        lockdep_assert_held(&sdata->u.mgd.mtx);
2691
2692        assoc_data->tries++;
2693        if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2694                sdata_info(sdata, "association with %pM timed out\n",
2695                           assoc_data->bss->bssid);
2696
2697                /*
2698                 * Most likely AP is not in the range so remove the
2699                 * bss struct for that AP.
2700                 */
2701                cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2702
2703                return -ETIMEDOUT;
2704        }
2705
2706        sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2707                   assoc_data->bss->bssid, assoc_data->tries,
2708                   IEEE80211_ASSOC_MAX_TRIES);
2709        ieee80211_send_assoc(sdata);
2710
2711        assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2712        run_again(&sdata->u.mgd, assoc_data->timeout);
2713
2714        return 0;
2715}
2716
2717void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2718{
2719        struct ieee80211_local *local = sdata->local;
2720        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2721
2722        mutex_lock(&ifmgd->mtx);
2723
2724        if (ifmgd->auth_data &&
2725            time_after(jiffies, ifmgd->auth_data->timeout)) {
2726                if (ifmgd->auth_data->done) {
2727                        /*
2728                         * ok ... we waited for assoc but userspace didn't,
2729                         * so let's just kill the auth data
2730                         */
2731                        ieee80211_destroy_auth_data(sdata, false);
2732                } else if (ieee80211_probe_auth(sdata)) {
2733                        u8 bssid[ETH_ALEN];
2734
2735                        memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2736
2737                        ieee80211_destroy_auth_data(sdata, false);
2738
2739                        mutex_unlock(&ifmgd->mtx);
2740                        cfg80211_send_auth_timeout(sdata->dev, bssid);
2741                        mutex_lock(&ifmgd->mtx);
2742                }
2743        } else if (ifmgd->auth_data)
2744                run_again(ifmgd, ifmgd->auth_data->timeout);
2745
2746        if (ifmgd->assoc_data &&
2747            time_after(jiffies, ifmgd->assoc_data->timeout)) {
2748                if (!ifmgd->assoc_data->have_beacon ||
2749                    ieee80211_do_assoc(sdata)) {
2750                        u8 bssid[ETH_ALEN];
2751
2752                        memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2753
2754                        ieee80211_destroy_assoc_data(sdata, false);
2755
2756                        mutex_unlock(&ifmgd->mtx);
2757                        cfg80211_send_assoc_timeout(sdata->dev, bssid);
2758                        mutex_lock(&ifmgd->mtx);
2759                }
2760        } else if (ifmgd->assoc_data)
2761                run_again(ifmgd, ifmgd->assoc_data->timeout);
2762
2763        if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2764                            IEEE80211_STA_CONNECTION_POLL) &&
2765            ifmgd->associated) {
2766                u8 bssid[ETH_ALEN];
2767                int max_tries;
2768
2769                memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2770
2771                if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2772                        max_tries = max_nullfunc_tries;
2773                else
2774                        max_tries = max_probe_tries;
2775
2776                /* ACK received for nullfunc probing frame */
2777                if (!ifmgd->probe_send_count)
2778                        ieee80211_reset_ap_probe(sdata);
2779                else if (ifmgd->nullfunc_failed) {
2780                        if (ifmgd->probe_send_count < max_tries) {
2781                                mlme_dbg(sdata,
2782                                         "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2783                                         bssid, ifmgd->probe_send_count,
2784                                         max_tries);
2785                                ieee80211_mgd_probe_ap_send(sdata);
2786                        } else {
2787                                mlme_dbg(sdata,
2788                                         "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2789                                         bssid);
2790                                ieee80211_sta_connection_lost(sdata, bssid,
2791                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2792                        }
2793                } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2794                        run_again(ifmgd, ifmgd->probe_timeout);
2795                else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2796                        mlme_dbg(sdata,
2797                                 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2798                                 bssid, probe_wait_ms);
2799                        ieee80211_sta_connection_lost(sdata, bssid,
2800                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2801                } else if (ifmgd->probe_send_count < max_tries) {
2802                        mlme_dbg(sdata,
2803                                 "No probe response from AP %pM after %dms, try %d/%i\n",
2804                                 bssid, probe_wait_ms,
2805                                 ifmgd->probe_send_count, max_tries);
2806                        ieee80211_mgd_probe_ap_send(sdata);
2807                } else {
2808                        /*
2809                         * We actually lost the connection ... or did we?
2810                         * Let's make sure!
2811                         */
2812                        wiphy_debug(local->hw.wiphy,
2813                                    "%s: No probe response from AP %pM"
2814                                    " after %dms, disconnecting.\n",
2815                                    sdata->name,
2816                                    bssid, probe_wait_ms);
2817
2818                        ieee80211_sta_connection_lost(sdata, bssid,
2819                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2820                }
2821        }
2822
2823        mutex_unlock(&ifmgd->mtx);
2824
2825        mutex_lock(&local->mtx);
2826        ieee80211_recalc_idle(local);
2827        mutex_unlock(&local->mtx);
2828}
2829
2830static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2831{
2832        struct ieee80211_sub_if_data *sdata =
2833                (struct ieee80211_sub_if_data *) data;
2834        struct ieee80211_local *local = sdata->local;
2835
2836        if (local->quiescing)
2837                return;
2838
2839        ieee80211_queue_work(&sdata->local->hw,
2840                             &sdata->u.mgd.beacon_connection_loss_work);
2841}
2842
2843static void ieee80211_sta_conn_mon_timer(unsigned long data)
2844{
2845        struct ieee80211_sub_if_data *sdata =
2846                (struct ieee80211_sub_if_data *) data;
2847        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2848        struct ieee80211_local *local = sdata->local;
2849
2850        if (local->quiescing)
2851                return;
2852
2853        ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2854}
2855
2856static void ieee80211_sta_monitor_work(struct work_struct *work)
2857{
2858        struct ieee80211_sub_if_data *sdata =
2859                container_of(work, struct ieee80211_sub_if_data,
2860                             u.mgd.monitor_work);
2861
2862        ieee80211_mgd_probe_ap(sdata, false);
2863}
2864
2865static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2866{
2867        u32 flags;
2868
2869        if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2870                __ieee80211_stop_poll(sdata);
2871
2872                /* let's probe the connection once */
2873                flags = sdata->local->hw.flags;
2874                if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2875                        ieee80211_queue_work(&sdata->local->hw,
2876                                             &sdata->u.mgd.monitor_work);
2877                /* and do all the other regular work too */
2878                ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2879        }
2880}
2881
2882#ifdef CONFIG_PM
2883void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2884{
2885        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2886
2887        /*
2888         * we need to use atomic bitops for the running bits
2889         * only because both timers might fire at the same
2890         * time -- the code here is properly synchronised.
2891         */
2892
2893        cancel_work_sync(&ifmgd->request_smps_work);
2894
2895        cancel_work_sync(&ifmgd->monitor_work);
2896        cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2897        if (del_timer_sync(&ifmgd->timer))
2898                set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2899
2900        cancel_work_sync(&ifmgd->chswitch_work);
2901        if (del_timer_sync(&ifmgd->chswitch_timer))
2902                set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2903
2904        /* these will just be re-established on connection */
2905        del_timer_sync(&ifmgd->conn_mon_timer);
2906        del_timer_sync(&ifmgd->bcn_mon_timer);
2907}
2908
2909void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2910{
2911        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2912
2913        if (!ifmgd->associated)
2914                return;
2915
2916        if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2917                sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2918                mutex_lock(&ifmgd->mtx);
2919                if (ifmgd->associated) {
2920                        mlme_dbg(sdata,
2921                                 "driver requested disconnect after resume\n");
2922                        ieee80211_sta_connection_lost(sdata,
2923                                ifmgd->associated->bssid,
2924                                WLAN_REASON_UNSPECIFIED);
2925                        mutex_unlock(&ifmgd->mtx);
2926                        return;
2927                }
2928                mutex_unlock(&ifmgd->mtx);
2929        }
2930
2931        if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2932                add_timer(&ifmgd->timer);
2933        if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2934                add_timer(&ifmgd->chswitch_timer);
2935        ieee80211_sta_reset_beacon_monitor(sdata);
2936
2937        mutex_lock(&sdata->local->mtx);
2938        ieee80211_restart_sta_timer(sdata);
2939        mutex_unlock(&sdata->local->mtx);
2940}
2941#endif
2942
2943/* interface setup */
2944void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2945{
2946        struct ieee80211_if_managed *ifmgd;
2947
2948        ifmgd = &sdata->u.mgd;
2949        INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2950        INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2951        INIT_WORK(&ifmgd->beacon_connection_loss_work,
2952                  ieee80211_beacon_connection_loss_work);
2953        INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2954        setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2955                    (unsigned long) sdata);
2956        setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2957                    (unsigned long) sdata);
2958        setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2959                    (unsigned long) sdata);
2960        setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2961                    (unsigned long) sdata);
2962
2963        ifmgd->flags = 0;
2964        ifmgd->powersave = sdata->wdev.ps;
2965        ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2966        ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2967
2968        mutex_init(&ifmgd->mtx);
2969
2970        if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2971                ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2972        else
2973                ifmgd->req_smps = IEEE80211_SMPS_OFF;
2974}
2975
2976/* scan finished notification */
2977void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2978{
2979        struct ieee80211_sub_if_data *sdata;
2980
2981        /* Restart STA timers */
2982        rcu_read_lock();
2983        list_for_each_entry_rcu(sdata, &local->interfaces, list)
2984                ieee80211_restart_sta_timer(sdata);
2985        rcu_read_unlock();
2986}
2987
2988int ieee80211_max_network_latency(struct notifier_block *nb,
2989                                  unsigned long data, void *dummy)
2990{
2991        s32 latency_usec = (s32) data;
2992        struct ieee80211_local *local =
2993                container_of(nb, struct ieee80211_local,
2994                             network_latency_notifier);
2995
2996        mutex_lock(&local->iflist_mtx);
2997        ieee80211_recalc_ps(local, latency_usec);
2998        mutex_unlock(&local->iflist_mtx);
2999
3000        return 0;
3001}
3002
3003static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3004                                     struct cfg80211_bss *cbss, bool assoc)
3005{
3006        struct ieee80211_local *local = sdata->local;
3007        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3008        struct ieee80211_bss *bss = (void *)cbss->priv;
3009        struct sta_info *sta = NULL;
3010        bool have_sta = false;
3011        int err;
3012        int ht_cfreq;
3013        enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3014        const u8 *ht_oper_ie;
3015        const struct ieee80211_ht_operation *ht_oper = NULL;
3016        struct ieee80211_supported_band *sband;
3017
3018        if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3019                return -EINVAL;
3020
3021        if (assoc) {
3022                rcu_read_lock();
3023                have_sta = sta_info_get(sdata, cbss->bssid);
3024                rcu_read_unlock();
3025        }
3026
3027        if (!have_sta) {
3028                sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3029                if (!sta)
3030                        return -ENOMEM;
3031        }
3032
3033        mutex_lock(&local->mtx);
3034        ieee80211_recalc_idle(sdata->local);
3035        mutex_unlock(&local->mtx);
3036
3037        /* switch to the right channel */
3038        sband = local->hw.wiphy->bands[cbss->channel->band];
3039
3040        ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3041
3042        if (sband->ht_cap.ht_supported) {
3043                ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3044                                              cbss->information_elements,
3045                                              cbss->len_information_elements);
3046                if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3047                        ht_oper = (void *)(ht_oper_ie + 2);
3048        }
3049
3050        if (ht_oper) {
3051                ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3052                                                          cbss->channel->band);
3053                /* check that channel matches the right operating channel */
3054                if (cbss->channel->center_freq != ht_cfreq) {
3055                        /*
3056                         * It's possible that some APs are confused here;
3057                         * Netgear WNDR3700 sometimes reports 4 higher than
3058                         * the actual channel in association responses, but
3059                         * since we look at probe response/beacon data here
3060                         * it should be OK.
3061                         */
3062                        sdata_info(sdata,
3063                                   "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3064                                   cbss->channel->center_freq,
3065                                   ht_cfreq, ht_oper->primary_chan,
3066                                   cbss->channel->band);
3067                        ht_oper = NULL;
3068                }
3069        }
3070
3071        if (ht_oper) {
3072                channel_type = NL80211_CHAN_HT20;
3073
3074                if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3075                        switch (ht_oper->ht_param &
3076                                        IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3077                        case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3078                                channel_type = NL80211_CHAN_HT40PLUS;
3079                                break;
3080                        case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3081                                channel_type = NL80211_CHAN_HT40MINUS;
3082                                break;
3083                        }
3084                }
3085        }
3086
3087        if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3088                /* can only fail due to HT40+/- mismatch */
3089                channel_type = NL80211_CHAN_HT20;
3090                sdata_info(sdata,
3091                           "disabling 40 MHz due to multi-vif mismatch\n");
3092                ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3093                WARN_ON(!ieee80211_set_channel_type(local, sdata,
3094                                                    channel_type));
3095        }
3096
3097        local->oper_channel = cbss->channel;
3098        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3099
3100        if (sta) {
3101                u32 rates = 0, basic_rates = 0;
3102                bool have_higher_than_11mbit;
3103                int min_rate = INT_MAX, min_rate_index = -1;
3104
3105                ieee80211_get_rates(sband, bss->supp_rates,
3106                                    bss->supp_rates_len,
3107                                    &rates, &basic_rates,
3108                                    &have_higher_than_11mbit,
3109                                    &min_rate, &min_rate_index);
3110
3111                /*
3112                 * This used to be a workaround for basic rates missing
3113                 * in the association response frame. Now that we no
3114                 * longer use the basic rates from there, it probably
3115                 * doesn't happen any more, but keep the workaround so
3116                 * in case some *other* APs are buggy in different ways
3117                 * we can connect -- with a warning.
3118                 */
3119                if (!basic_rates && min_rate_index >= 0) {
3120                        sdata_info(sdata,
3121                                   "No basic rates, using min rate instead\n");
3122                        basic_rates = BIT(min_rate_index);
3123                }
3124
3125                sta->sta.supp_rates[cbss->channel->band] = rates;
3126                sdata->vif.bss_conf.basic_rates = basic_rates;
3127
3128                /* cf. IEEE 802.11 9.2.12 */
3129                if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3130                    have_higher_than_11mbit)
3131                        sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3132                else
3133                        sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3134
3135                memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3136
3137                /* set timing information */
3138                sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3139                sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3140                sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3141
3142                /* tell driver about BSSID, basic rates and timing */
3143                ieee80211_bss_info_change_notify(sdata,
3144                        BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3145                        BSS_CHANGED_BEACON_INT);
3146
3147                if (assoc)
3148                        sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3149
3150                err = sta_info_insert(sta);
3151                sta = NULL;
3152                if (err) {
3153                        sdata_info(sdata,
3154                                   "failed to insert STA entry for the AP (error %d)\n",
3155                                   err);
3156                        return err;
3157                }
3158        } else
3159                WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3160
3161        return 0;
3162}
3163
3164/* config hooks */
3165int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3166                       struct cfg80211_auth_request *req)
3167{
3168        struct ieee80211_local *local = sdata->local;
3169        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3170        struct ieee80211_mgd_auth_data *auth_data;
3171        u16 auth_alg;
3172        int err;
3173
3174        /* prepare auth data structure */
3175
3176        switch (req->auth_type) {
3177        case NL80211_AUTHTYPE_OPEN_SYSTEM:
3178                auth_alg = WLAN_AUTH_OPEN;
3179                break;
3180        case NL80211_AUTHTYPE_SHARED_KEY:
3181                if (IS_ERR(local->wep_tx_tfm))
3182                        return -EOPNOTSUPP;
3183                auth_alg = WLAN_AUTH_SHARED_KEY;
3184                break;
3185        case NL80211_AUTHTYPE_FT:
3186                auth_alg = WLAN_AUTH_FT;
3187                break;
3188        case NL80211_AUTHTYPE_NETWORK_EAP:
3189                auth_alg = WLAN_AUTH_LEAP;
3190                break;
3191        default:
3192                return -EOPNOTSUPP;
3193        }
3194
3195        auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3196        if (!auth_data)
3197                return -ENOMEM;
3198
3199        auth_data->bss = req->bss;
3200
3201        if (req->ie && req->ie_len) {
3202                memcpy(auth_data->ie, req->ie, req->ie_len);
3203                auth_data->ie_len = req->ie_len;
3204        }
3205
3206        if (req->key && req->key_len) {
3207                auth_data->key_len = req->key_len;
3208                auth_data->key_idx = req->key_idx;
3209                memcpy(auth_data->key, req->key, req->key_len);
3210        }
3211
3212        auth_data->algorithm = auth_alg;
3213
3214        /* try to authenticate/probe */
3215
3216        mutex_lock(&ifmgd->mtx);
3217
3218        if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3219            ifmgd->assoc_data) {
3220                err = -EBUSY;
3221                goto err_free;
3222        }
3223
3224        if (ifmgd->auth_data)
3225                ieee80211_destroy_auth_data(sdata, false);
3226
3227        /* prep auth_data so we don't go into idle on disassoc */
3228        ifmgd->auth_data = auth_data;
3229
3230        if (ifmgd->associated)
3231                ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3232
3233        sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3234
3235        err = ieee80211_prep_connection(sdata, req->bss, false);
3236        if (err)
3237                goto err_clear;
3238
3239        err = ieee80211_probe_auth(sdata);
3240        if (err) {
3241                sta_info_destroy_addr(sdata, req->bss->bssid);
3242                goto err_clear;
3243        }
3244
3245        /* hold our own reference */
3246        cfg80211_ref_bss(auth_data->bss);
3247        err = 0;
3248        goto out_unlock;
3249
3250 err_clear:
3251        memset(ifmgd->bssid, 0, ETH_ALEN);
3252        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3253        ifmgd->auth_data = NULL;
3254 err_free:
3255        kfree(auth_data);
3256 out_unlock:
3257        mutex_unlock(&ifmgd->mtx);
3258
3259        return err;
3260}
3261
3262int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3263                        struct cfg80211_assoc_request *req)
3264{
3265        struct ieee80211_local *local = sdata->local;
3266        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3267        struct ieee80211_bss *bss = (void *)req->bss->priv;
3268        struct ieee80211_mgd_assoc_data *assoc_data;
3269        struct ieee80211_supported_band *sband;
3270        const u8 *ssidie, *ht_ie;
3271        int i, err;
3272
3273        ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3274        if (!ssidie)
3275                return -EINVAL;
3276
3277        assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3278        if (!assoc_data)
3279                return -ENOMEM;
3280
3281        mutex_lock(&ifmgd->mtx);
3282
3283        if (ifmgd->associated)
3284                ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3285
3286        if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3287                err = -EBUSY;
3288                goto err_free;
3289        }
3290
3291        if (ifmgd->assoc_data) {
3292                err = -EBUSY;
3293                goto err_free;
3294        }
3295
3296        if (ifmgd->auth_data) {
3297                bool match;
3298
3299                /* keep sta info, bssid if matching */
3300                match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3301                ieee80211_destroy_auth_data(sdata, match);
3302        }
3303
3304        /* prepare assoc data */
3305
3306        ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3307        ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3308
3309        ifmgd->beacon_crc_valid = false;
3310
3311        /*
3312         * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3313         * We still associate in non-HT mode (11a/b/g) if any one of these
3314         * ciphers is configured as pairwise.
3315         * We can set this to true for non-11n hardware, that'll be checked
3316         * separately along with the peer capabilities.
3317         */
3318        for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3319                if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3320                    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3321                    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3322                        ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3323                        netdev_info(sdata->dev,
3324                                    "disabling HT due to WEP/TKIP use\n");
3325                }
3326        }
3327
3328        if (req->flags & ASSOC_REQ_DISABLE_HT)
3329                ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3330
3331        /* Also disable HT if we don't support it or the AP doesn't use WMM */
3332        sband = local->hw.wiphy->bands[req->bss->channel->band];
3333        if (!sband->ht_cap.ht_supported ||
3334            local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3335                ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3336                netdev_info(sdata->dev,
3337                            "disabling HT as WMM/QoS is not supported\n");
3338        }
3339
3340        memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3341        memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3342               sizeof(ifmgd->ht_capa_mask));
3343
3344        if (req->ie && req->ie_len) {
3345                memcpy(assoc_data->ie, req->ie, req->ie_len);
3346                assoc_data->ie_len = req->ie_len;
3347        }
3348
3349        assoc_data->bss = req->bss;
3350
3351        if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3352                if (ifmgd->powersave)
3353                        ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3354                else
3355                        ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3356        } else
3357                ifmgd->ap_smps = ifmgd->req_smps;
3358
3359        assoc_data->capability = req->bss->capability;
3360        assoc_data->wmm = bss->wmm_used &&
3361                          (local->hw.queues >= IEEE80211_NUM_ACS);
3362        assoc_data->supp_rates = bss->supp_rates;
3363        assoc_data->supp_rates_len = bss->supp_rates_len;
3364
3365        ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3366        if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3367                assoc_data->ap_ht_param =
3368                        ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3369        else
3370                ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3371
3372        if (bss->wmm_used && bss->uapsd_supported &&
3373            (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3374                assoc_data->uapsd = true;
3375                ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3376        } else {
3377                assoc_data->uapsd = false;
3378                ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3379        }
3380
3381        memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3382        assoc_data->ssid_len = ssidie[1];
3383
3384        if (req->prev_bssid)
3385                memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3386
3387        if (req->use_mfp) {
3388                ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3389                ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3390        } else {
3391                ifmgd->mfp = IEEE80211_MFP_DISABLED;
3392                ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3393        }
3394
3395        if (req->crypto.control_port)
3396                ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3397        else
3398                ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3399
3400        sdata->control_port_protocol = req->crypto.control_port_ethertype;
3401        sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3402
3403        /* kick off associate process */
3404
3405        ifmgd->assoc_data = assoc_data;
3406
3407        err = ieee80211_prep_connection(sdata, req->bss, true);
3408        if (err)
3409                goto err_clear;
3410
3411        if (!bss->dtim_period &&
3412            sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3413                /*
3414                 * Wait up to one beacon interval ...
3415                 * should this be more if we miss one?
3416                 */
3417                sdata_info(sdata, "waiting for beacon from %pM\n",
3418                           ifmgd->bssid);
3419                assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3420        } else {
3421                assoc_data->have_beacon = true;
3422                assoc_data->sent_assoc = false;
3423                assoc_data->timeout = jiffies;
3424        }
3425        run_again(ifmgd, assoc_data->timeout);
3426
3427        if (bss->corrupt_data) {
3428                char *corrupt_type = "data";
3429                if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3430                        if (bss->corrupt_data &
3431                                        IEEE80211_BSS_CORRUPT_PROBE_RESP)
3432                                corrupt_type = "beacon and probe response";
3433                        else
3434                                corrupt_type = "beacon";
3435                } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3436                        corrupt_type = "probe response";
3437                sdata_info(sdata, "associating with AP with corrupt %s\n",
3438                           corrupt_type);
3439        }
3440
3441        err = 0;
3442        goto out;
3443 err_clear:
3444        memset(ifmgd->bssid, 0, ETH_ALEN);
3445        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3446        ifmgd->assoc_data = NULL;
3447 err_free:
3448        kfree(assoc_data);
3449 out:
3450        mutex_unlock(&ifmgd->mtx);
3451
3452        return err;
3453}
3454
3455int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3456                         struct cfg80211_deauth_request *req)
3457{
3458        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3459        u8 frame_buf[DEAUTH_DISASSOC_LEN];
3460
3461        mutex_lock(&ifmgd->mtx);
3462
3463        if (ifmgd->auth_data) {
3464                ieee80211_destroy_auth_data(sdata, false);
3465                mutex_unlock(&ifmgd->mtx);
3466                return 0;
3467        }
3468
3469        sdata_info(sdata,
3470                   "deauthenticating from %pM by local choice (reason=%d)\n",
3471                   req->bssid, req->reason_code);
3472
3473        if (ifmgd->associated &&
3474            ether_addr_equal(ifmgd->associated->bssid, req->bssid))
3475                ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3476                                       req->reason_code, true, frame_buf);
3477        else
3478                ieee80211_send_deauth_disassoc(sdata, req->bssid,
3479                                               IEEE80211_STYPE_DEAUTH,
3480                                               req->reason_code, true,
3481                                               frame_buf);
3482        mutex_unlock(&ifmgd->mtx);
3483
3484        __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3485
3486        mutex_lock(&sdata->local->mtx);
3487        ieee80211_recalc_idle(sdata->local);
3488        mutex_unlock(&sdata->local->mtx);
3489
3490        return 0;
3491}
3492
3493int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3494                           struct cfg80211_disassoc_request *req)
3495{
3496        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3497        u8 bssid[ETH_ALEN];
3498        u8 frame_buf[DEAUTH_DISASSOC_LEN];
3499
3500        mutex_lock(&ifmgd->mtx);
3501
3502        /*
3503         * cfg80211 should catch this ... but it's racy since
3504         * we can receive a disassoc frame, process it, hand it
3505         * to cfg80211 while that's in a locked section already
3506         * trying to tell us that the user wants to disconnect.
3507         */
3508        if (ifmgd->associated != req->bss) {
3509                mutex_unlock(&ifmgd->mtx);
3510                return -ENOLINK;
3511        }
3512
3513        sdata_info(sdata,
3514                   "disassociating from %pM by local choice (reason=%d)\n",
3515                   req->bss->bssid, req->reason_code);
3516
3517        memcpy(bssid, req->bss->bssid, ETH_ALEN);
3518        ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3519                               req->reason_code, !req->local_state_change,
3520                               frame_buf);
3521        mutex_unlock(&ifmgd->mtx);
3522
3523        __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3524
3525        mutex_lock(&sdata->local->mtx);
3526        ieee80211_recalc_idle(sdata->local);
3527        mutex_unlock(&sdata->local->mtx);
3528
3529        return 0;
3530}
3531
3532void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3533{
3534        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3535
3536        mutex_lock(&ifmgd->mtx);
3537        if (ifmgd->assoc_data)
3538                ieee80211_destroy_assoc_data(sdata, false);
3539        if (ifmgd->auth_data)
3540                ieee80211_destroy_auth_data(sdata, false);
3541        del_timer_sync(&ifmgd->timer);
3542        mutex_unlock(&ifmgd->mtx);
3543}
3544
3545void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3546                               enum nl80211_cqm_rssi_threshold_event rssi_event,
3547                               gfp_t gfp)
3548{
3549        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3550
3551        trace_api_cqm_rssi_notify(sdata, rssi_event);
3552
3553        cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3554}
3555EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
3556
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