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/*
  92 * All cfg80211 functions have to be called outside a locked
  93 * section so that they can acquire a lock themselves... This
  94 * is much simpler than queuing up things in cfg80211, but we
  95 * do need some indirection for that here.
  96 */
  97enum rx_mgmt_action {
  98        /* no action required */
  99        RX_MGMT_NONE,
 100
 101        /* caller must call cfg80211_send_deauth() */
 102        RX_MGMT_CFG80211_DEAUTH,
 103
 104        /* caller must call cfg80211_send_disassoc() */
 105        RX_MGMT_CFG80211_DISASSOC,
 106
 107        /* caller must call cfg80211_send_rx_auth() */
 108        RX_MGMT_CFG80211_RX_AUTH,
 109
 110        /* caller must call cfg80211_send_rx_assoc() */
 111        RX_MGMT_CFG80211_RX_ASSOC,
 112
 113        /* caller must call cfg80211_send_assoc_timeout() */
 114        RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 115};
 116
 117/* utils */
 118static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 119{
 120        lockdep_assert_held(&ifmgd->mtx);
 121}
 122
 123/*
 124 * We can have multiple work items (and connection probing)
 125 * scheduling this timer, but we need to take care to only
 126 * reschedule it when it should fire _earlier_ than it was
 127 * asked for before, or if it's not pending right now. This
 128 * function ensures that. Note that it then is required to
 129 * run this function for all timeouts after the first one
 130 * has happened -- the work that runs from this timer will
 131 * do that.
 132 */
 133static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 134{
 135        ASSERT_MGD_MTX(ifmgd);
 136
 137        if (!timer_pending(&ifmgd->timer) ||
 138            time_before(timeout, ifmgd->timer.expires))
 139                mod_timer(&ifmgd->timer, timeout);
 140}
 141
 142void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 143{
 144        if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 145                return;
 146
 147        if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 148                return;
 149
 150        mod_timer(&sdata->u.mgd.bcn_mon_timer,
 151                  round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 152}
 153
 154void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 155{
 156        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 157
 158        if (unlikely(!sdata->u.mgd.associated))
 159                return;
 160
 161        if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 162                return;
 163
 164        mod_timer(&sdata->u.mgd.conn_mon_timer,
 165                  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 166
 167        ifmgd->probe_send_count = 0;
 168}
 169
 170static int ecw2cw(int ecw)
 171{
 172        return (1 << ecw) - 1;
 173}
 174
 175static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
 176                                  struct ieee80211_ht_operation *ht_oper,
 177                                  const u8 *bssid, bool reconfig)
 178{
 179        struct ieee80211_local *local = sdata->local;
 180        struct ieee80211_supported_band *sband;
 181        struct sta_info *sta;
 182        u32 changed = 0;
 183        u16 ht_opmode;
 184        bool disable_40 = false;
 185
 186        sband = local->hw.wiphy->bands[local->oper_channel->band];
 187
 188        switch (sdata->vif.bss_conf.channel_type) {
 189        case NL80211_CHAN_HT40PLUS:
 190                if (local->oper_channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 191                        disable_40 = true;
 192                break;
 193        case NL80211_CHAN_HT40MINUS:
 194                if (local->oper_channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
 195                        disable_40 = true;
 196                break;
 197        default:
 198                break;
 199        }
 200
 201        /* This can change during the lifetime of the BSS */
 202        if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 203                disable_40 = true;
 204
 205        mutex_lock(&local->sta_mtx);
 206        sta = sta_info_get(sdata, bssid);
 207
 208        WARN_ON_ONCE(!sta);
 209
 210        if (sta && !sta->supports_40mhz)
 211                disable_40 = true;
 212
 213        if (sta && (!reconfig ||
 214                    (disable_40 != !(sta->sta.ht_cap.cap &
 215                                        IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 216
 217                if (disable_40)
 218                        sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 219                else
 220                        sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 221
 222                rate_control_rate_update(local, sband, sta,
 223                                         IEEE80211_RC_BW_CHANGED);
 224        }
 225        mutex_unlock(&local->sta_mtx);
 226
 227        ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 228
 229        /* if bss configuration changed store the new one */
 230        if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 231                changed |= BSS_CHANGED_HT;
 232                sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 233        }
 234
 235        return changed;
 236}
 237
 238/* frame sending functions */
 239
 240static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 241                                      struct ieee80211_supported_band *sband,
 242                                      u32 *rates)
 243{
 244        int i, j, count;
 245        *rates = 0;
 246        count = 0;
 247        for (i = 0; i < supp_rates_len; i++) {
 248                int rate = (supp_rates[i] & 0x7F) * 5;
 249
 250                for (j = 0; j < sband->n_bitrates; j++)
 251                        if (sband->bitrates[j].bitrate == rate) {
 252                                *rates |= BIT(j);
 253                                count++;
 254                                break;
 255                        }
 256        }
 257
 258        return count;
 259}
 260
 261static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 262                                struct sk_buff *skb, u8 ap_ht_param,
 263                                struct ieee80211_supported_band *sband,
 264                                struct ieee80211_channel *channel,
 265                                enum ieee80211_smps_mode smps)
 266{
 267        u8 *pos;
 268        u32 flags = channel->flags;
 269        u16 cap;
 270        struct ieee80211_sta_ht_cap ht_cap;
 271
 272        BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 273
 274        memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 275        ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 276
 277        /* determine capability flags */
 278        cap = ht_cap.cap;
 279
 280        switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 281        case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 282                if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 283                        cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 284                        cap &= ~IEEE80211_HT_CAP_SGI_40;
 285                }
 286                break;
 287        case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 288                if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 289                        cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 290                        cap &= ~IEEE80211_HT_CAP_SGI_40;
 291                }
 292                break;
 293        }
 294
 295        /*
 296         * If 40 MHz was disabled associate as though we weren't
 297         * capable of 40 MHz -- some broken APs will never fall
 298         * back to trying to transmit in 20 MHz.
 299         */
 300        if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 301                cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 302                cap &= ~IEEE80211_HT_CAP_SGI_40;
 303        }
 304
 305        /* set SM PS mode properly */
 306        cap &= ~IEEE80211_HT_CAP_SM_PS;
 307        switch (smps) {
 308        case IEEE80211_SMPS_AUTOMATIC:
 309        case IEEE80211_SMPS_NUM_MODES:
 310                WARN_ON(1);
 311        case IEEE80211_SMPS_OFF:
 312                cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 313                        IEEE80211_HT_CAP_SM_PS_SHIFT;
 314                break;
 315        case IEEE80211_SMPS_STATIC:
 316                cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 317                        IEEE80211_HT_CAP_SM_PS_SHIFT;
 318                break;
 319        case IEEE80211_SMPS_DYNAMIC:
 320                cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 321                        IEEE80211_HT_CAP_SM_PS_SHIFT;
 322                break;
 323        }
 324
 325        /* reserve and fill IE */
 326        pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 327        ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 328}
 329
 330static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 331                                 struct sk_buff *skb,
 332                                 struct ieee80211_supported_band *sband)
 333{
 334        u8 *pos;
 335        u32 cap;
 336        struct ieee80211_sta_vht_cap vht_cap;
 337
 338        BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 339
 340        memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 341
 342        /* determine capability flags */
 343        cap = vht_cap.cap;
 344
 345        /* reserve and fill IE */
 346        pos = skb_put(skb, sizeof(struct ieee80211_vht_capabilities) + 2);
 347        ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 348}
 349
 350static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 351{
 352        struct ieee80211_local *local = sdata->local;
 353        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 354        struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 355        struct sk_buff *skb;
 356        struct ieee80211_mgmt *mgmt;
 357        u8 *pos, qos_info;
 358        size_t offset = 0, noffset;
 359        int i, count, rates_len, supp_rates_len;
 360        u16 capab;
 361        struct ieee80211_supported_band *sband;
 362        u32 rates = 0;
 363
 364        lockdep_assert_held(&ifmgd->mtx);
 365
 366        sband = local->hw.wiphy->bands[local->oper_channel->band];
 367
 368        if (assoc_data->supp_rates_len) {
 369                /*
 370                 * Get all rates supported by the device and the AP as
 371                 * some APs don't like getting a superset of their rates
 372                 * in the association request (e.g. D-Link DAP 1353 in
 373                 * b-only mode)...
 374                 */
 375                rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 376                                                       assoc_data->supp_rates_len,
 377                                                       sband, &rates);
 378        } else {
 379                /*
 380                 * In case AP not provide any supported rates information
 381                 * before association, we send information element(s) with
 382                 * all rates that we support.
 383                 */
 384                rates = ~0;
 385                rates_len = sband->n_bitrates;
 386        }
 387
 388        skb = alloc_skb(local->hw.extra_tx_headroom +
 389                        sizeof(*mgmt) + /* bit too much but doesn't matter */
 390                        2 + assoc_data->ssid_len + /* SSID */
 391                        4 + rates_len + /* (extended) rates */
 392                        4 + /* power capability */
 393                        2 + 2 * sband->n_channels + /* supported channels */
 394                        2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 395                        2 + sizeof(struct ieee80211_vht_capabilities) + /* VHT */
 396                        assoc_data->ie_len + /* extra IEs */
 397                        9, /* WMM */
 398                        GFP_KERNEL);
 399        if (!skb)
 400                return;
 401
 402        skb_reserve(skb, local->hw.extra_tx_headroom);
 403
 404        capab = WLAN_CAPABILITY_ESS;
 405
 406        if (sband->band == IEEE80211_BAND_2GHZ) {
 407                if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 408                        capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 409                if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 410                        capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 411        }
 412
 413        if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 414                capab |= WLAN_CAPABILITY_PRIVACY;
 415
 416        if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 417            (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 418                capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 419
 420        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 421        memset(mgmt, 0, 24);
 422        memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 423        memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 424        memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 425
 426        if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 427                skb_put(skb, 10);
 428                mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 429                                                  IEEE80211_STYPE_REASSOC_REQ);
 430                mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 431                mgmt->u.reassoc_req.listen_interval =
 432                                cpu_to_le16(local->hw.conf.listen_interval);
 433                memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 434                       ETH_ALEN);
 435        } else {
 436                skb_put(skb, 4);
 437                mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 438                                                  IEEE80211_STYPE_ASSOC_REQ);
 439                mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 440                mgmt->u.assoc_req.listen_interval =
 441                                cpu_to_le16(local->hw.conf.listen_interval);
 442        }
 443
 444        /* SSID */
 445        pos = skb_put(skb, 2 + assoc_data->ssid_len);
 446        *pos++ = WLAN_EID_SSID;
 447        *pos++ = assoc_data->ssid_len;
 448        memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 449
 450        /* add all rates which were marked to be used above */
 451        supp_rates_len = rates_len;
 452        if (supp_rates_len > 8)
 453                supp_rates_len = 8;
 454
 455        pos = skb_put(skb, supp_rates_len + 2);
 456        *pos++ = WLAN_EID_SUPP_RATES;
 457        *pos++ = supp_rates_len;
 458
 459        count = 0;
 460        for (i = 0; i < sband->n_bitrates; i++) {
 461                if (BIT(i) & rates) {
 462                        int rate = sband->bitrates[i].bitrate;
 463                        *pos++ = (u8) (rate / 5);
 464                        if (++count == 8)
 465                                break;
 466                }
 467        }
 468
 469        if (rates_len > count) {
 470                pos = skb_put(skb, rates_len - count + 2);
 471                *pos++ = WLAN_EID_EXT_SUPP_RATES;
 472                *pos++ = rates_len - count;
 473
 474                for (i++; i < sband->n_bitrates; i++) {
 475                        if (BIT(i) & rates) {
 476                                int rate = sband->bitrates[i].bitrate;
 477                                *pos++ = (u8) (rate / 5);
 478                        }
 479                }
 480        }
 481
 482        if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 483                /* 1. power capabilities */
 484                pos = skb_put(skb, 4);
 485                *pos++ = WLAN_EID_PWR_CAPABILITY;
 486                *pos++ = 2;
 487                *pos++ = 0; /* min tx power */
 488                *pos++ = local->oper_channel->max_power; /* max tx power */
 489
 490                /* 2. supported channels */
 491                /* TODO: get this in reg domain format */
 492                pos = skb_put(skb, 2 * sband->n_channels + 2);
 493                *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 494                *pos++ = 2 * sband->n_channels;
 495                for (i = 0; i < sband->n_channels; i++) {
 496                        *pos++ = ieee80211_frequency_to_channel(
 497                                        sband->channels[i].center_freq);
 498                        *pos++ = 1; /* one channel in the subband*/
 499                }
 500        }
 501
 502        /* if present, add any custom IEs that go before HT */
 503        if (assoc_data->ie_len && assoc_data->ie) {
 504                static const u8 before_ht[] = {
 505                        WLAN_EID_SSID,
 506                        WLAN_EID_SUPP_RATES,
 507                        WLAN_EID_EXT_SUPP_RATES,
 508                        WLAN_EID_PWR_CAPABILITY,
 509                        WLAN_EID_SUPPORTED_CHANNELS,
 510                        WLAN_EID_RSN,
 511                        WLAN_EID_QOS_CAPA,
 512                        WLAN_EID_RRM_ENABLED_CAPABILITIES,
 513                        WLAN_EID_MOBILITY_DOMAIN,
 514                        WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 515                };
 516                noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 517                                             before_ht, ARRAY_SIZE(before_ht),
 518                                             offset);
 519                pos = skb_put(skb, noffset - offset);
 520                memcpy(pos, assoc_data->ie + offset, noffset - offset);
 521                offset = noffset;
 522        }
 523
 524        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 525                ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 526                                    sband, local->oper_channel, ifmgd->ap_smps);
 527
 528        if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 529                ieee80211_add_vht_ie(sdata, skb, sband);
 530
 531        /* if present, add any custom non-vendor IEs that go after HT */
 532        if (assoc_data->ie_len && assoc_data->ie) {
 533                noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 534                                                    assoc_data->ie_len,
 535                                                    offset);
 536                pos = skb_put(skb, noffset - offset);
 537                memcpy(pos, assoc_data->ie + offset, noffset - offset);
 538                offset = noffset;
 539        }
 540
 541        if (assoc_data->wmm) {
 542                if (assoc_data->uapsd) {
 543                        qos_info = ifmgd->uapsd_queues;
 544                        qos_info |= (ifmgd->uapsd_max_sp_len <<
 545                                     IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 546                } else {
 547                        qos_info = 0;
 548                }
 549
 550                pos = skb_put(skb, 9);
 551                *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 552                *pos++ = 7; /* len */
 553                *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 554                *pos++ = 0x50;
 555                *pos++ = 0xf2;
 556                *pos++ = 2; /* WME */
 557                *pos++ = 0; /* WME info */
 558                *pos++ = 1; /* WME ver */
 559                *pos++ = qos_info;
 560        }
 561
 562        /* add any remaining custom (i.e. vendor specific here) IEs */
 563        if (assoc_data->ie_len && assoc_data->ie) {
 564                noffset = assoc_data->ie_len;
 565                pos = skb_put(skb, noffset - offset);
 566                memcpy(pos, assoc_data->ie + offset, noffset - offset);
 567        }
 568
 569        drv_mgd_prepare_tx(local, sdata);
 570
 571        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 572        ieee80211_tx_skb(sdata, skb);
 573}
 574
 575void ieee80211_send_pspoll(struct ieee80211_local *local,
 576                           struct ieee80211_sub_if_data *sdata)
 577{
 578        struct ieee80211_pspoll *pspoll;
 579        struct sk_buff *skb;
 580
 581        skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 582        if (!skb)
 583                return;
 584
 585        pspoll = (struct ieee80211_pspoll *) skb->data;
 586        pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 587
 588        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 589        ieee80211_tx_skb(sdata, skb);
 590}
 591
 592void ieee80211_send_nullfunc(struct ieee80211_local *local,
 593                             struct ieee80211_sub_if_data *sdata,
 594                             int powersave)
 595{
 596        struct sk_buff *skb;
 597        struct ieee80211_hdr_3addr *nullfunc;
 598        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 599
 600        skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 601        if (!skb)
 602                return;
 603
 604        nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 605        if (powersave)
 606                nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 607
 608        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 609        if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 610                            IEEE80211_STA_CONNECTION_POLL))
 611                IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 612
 613        ieee80211_tx_skb(sdata, skb);
 614}
 615
 616static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 617                                          struct ieee80211_sub_if_data *sdata)
 618{
 619        struct sk_buff *skb;
 620        struct ieee80211_hdr *nullfunc;
 621        __le16 fc;
 622
 623        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 624                return;
 625
 626        skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 627        if (!skb)
 628                return;
 629
 630        skb_reserve(skb, local->hw.extra_tx_headroom);
 631
 632        nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 633        memset(nullfunc, 0, 30);
 634        fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 635                         IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 636        nullfunc->frame_control = fc;
 637        memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 638        memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 639        memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 640        memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 641
 642        IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 643        ieee80211_tx_skb(sdata, skb);
 644}
 645
 646/* spectrum management related things */
 647static void ieee80211_chswitch_work(struct work_struct *work)
 648{
 649        struct ieee80211_sub_if_data *sdata =
 650                container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 651        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 652
 653        if (!ieee80211_sdata_running(sdata))
 654                return;
 655
 656        mutex_lock(&ifmgd->mtx);
 657        if (!ifmgd->associated)
 658                goto out;
 659
 660        sdata->local->oper_channel = sdata->local->csa_channel;
 661        if (!sdata->local->ops->channel_switch) {
 662                /* call "hw_config" only if doing sw channel switch */
 663                ieee80211_hw_config(sdata->local,
 664                        IEEE80211_CONF_CHANGE_CHANNEL);
 665        } else {
 666                /* update the device channel directly */
 667                sdata->local->hw.conf.channel = sdata->local->oper_channel;
 668        }
 669
 670        /* XXX: shouldn't really modify cfg80211-owned data! */
 671        ifmgd->associated->channel = sdata->local->oper_channel;
 672
 673        /* XXX: wait for a beacon first? */
 674        ieee80211_wake_queues_by_reason(&sdata->local->hw,
 675                                        IEEE80211_QUEUE_STOP_REASON_CSA);
 676 out:
 677        ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 678        mutex_unlock(&ifmgd->mtx);
 679}
 680
 681void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 682{
 683        struct ieee80211_sub_if_data *sdata;
 684        struct ieee80211_if_managed *ifmgd;
 685
 686        sdata = vif_to_sdata(vif);
 687        ifmgd = &sdata->u.mgd;
 688
 689        trace_api_chswitch_done(sdata, success);
 690        if (!success) {
 691                sdata_info(sdata,
 692                           "driver channel switch failed, disconnecting\n");
 693                ieee80211_queue_work(&sdata->local->hw,
 694                                     &ifmgd->csa_connection_drop_work);
 695        } else {
 696                ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 697        }
 698}
 699EXPORT_SYMBOL(ieee80211_chswitch_done);
 700
 701static void ieee80211_chswitch_timer(unsigned long data)
 702{
 703        struct ieee80211_sub_if_data *sdata =
 704                (struct ieee80211_sub_if_data *) data;
 705        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 706
 707        if (sdata->local->quiescing) {
 708                set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 709                return;
 710        }
 711
 712        ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 713}
 714
 715void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 716                                      struct ieee80211_channel_sw_ie *sw_elem,
 717                                      struct ieee80211_bss *bss,
 718                                      u64 timestamp)
 719{
 720        struct cfg80211_bss *cbss =
 721                container_of((void *)bss, struct cfg80211_bss, priv);
 722        struct ieee80211_channel *new_ch;
 723        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 724        int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 725                                                      cbss->channel->band);
 726
 727        ASSERT_MGD_MTX(ifmgd);
 728
 729        if (!ifmgd->associated)
 730                return;
 731
 732        if (sdata->local->scanning)
 733                return;
 734
 735        /* Disregard subsequent beacons if we are already running a timer
 736           processing a CSA */
 737
 738        if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 739                return;
 740
 741        new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 742        if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
 743                sdata_info(sdata,
 744                           "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
 745                           ifmgd->associated->bssid, new_freq);
 746                ieee80211_queue_work(&sdata->local->hw,
 747                                     &ifmgd->csa_connection_drop_work);
 748                return;
 749        }
 750
 751        sdata->local->csa_channel = new_ch;
 752
 753        ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 754
 755        if (sw_elem->mode)
 756                ieee80211_stop_queues_by_reason(&sdata->local->hw,
 757                                IEEE80211_QUEUE_STOP_REASON_CSA);
 758
 759        if (sdata->local->ops->channel_switch) {
 760                /* use driver's channel switch callback */
 761                struct ieee80211_channel_switch ch_switch = {
 762                        .timestamp = timestamp,
 763                        .block_tx = sw_elem->mode,
 764                        .channel = new_ch,
 765                        .count = sw_elem->count,
 766                };
 767
 768                drv_channel_switch(sdata->local, &ch_switch);
 769                return;
 770        }
 771
 772        /* channel switch handled in software */
 773        if (sw_elem->count <= 1)
 774                ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 775        else
 776                mod_timer(&ifmgd->chswitch_timer,
 777                          TU_TO_EXP_TIME(sw_elem->count *
 778                                         cbss->beacon_interval));
 779}
 780
 781static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 782                                        struct ieee80211_channel *channel,
 783                                        const u8 *country_ie, u8 country_ie_len,
 784                                        const u8 *pwr_constr_elem)
 785{
 786        struct ieee80211_country_ie_triplet *triplet;
 787        int chan = ieee80211_frequency_to_channel(channel->center_freq);
 788        int i, chan_pwr, chan_increment, new_ap_level;
 789        bool have_chan_pwr = false;
 790
 791        /* Invalid IE */
 792        if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
 793                return;
 794
 795        triplet = (void *)(country_ie + 3);
 796        country_ie_len -= 3;
 797
 798        switch (channel->band) {
 799        default:
 800                WARN_ON_ONCE(1);
 801                /* fall through */
 802        case IEEE80211_BAND_2GHZ:
 803        case IEEE80211_BAND_60GHZ:
 804                chan_increment = 1;
 805                break;
 806        case IEEE80211_BAND_5GHZ:
 807                chan_increment = 4;
 808                break;
 809        }
 810
 811        /* find channel */
 812        while (country_ie_len >= 3) {
 813                u8 first_channel = triplet->chans.first_channel;
 814
 815                if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
 816                        goto next;
 817
 818                for (i = 0; i < triplet->chans.num_channels; i++) {
 819                        if (first_channel + i * chan_increment == chan) {
 820                                have_chan_pwr = true;
 821                                chan_pwr = triplet->chans.max_power;
 822                                break;
 823                        }
 824                }
 825                if (have_chan_pwr)
 826                        break;
 827
 828 next:
 829                triplet++;
 830                country_ie_len -= 3;
 831        }
 832
 833        if (!have_chan_pwr)
 834                return;
 835
 836        new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
 837
 838        if (sdata->local->ap_power_level == new_ap_level)
 839                return;
 840
 841        sdata_info(sdata,
 842                   "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
 843                   new_ap_level, chan_pwr, *pwr_constr_elem,
 844                   sdata->u.mgd.bssid);
 845        sdata->local->ap_power_level = new_ap_level;
 846        ieee80211_hw_config(sdata->local, 0);
 847}
 848
 849void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 850{
 851        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 852        struct ieee80211_local *local = sdata->local;
 853        struct ieee80211_conf *conf = &local->hw.conf;
 854
 855        WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 856                !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 857                (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 858
 859        local->disable_dynamic_ps = false;
 860        conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 861}
 862EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 863
 864void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 865{
 866        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 867        struct ieee80211_local *local = sdata->local;
 868        struct ieee80211_conf *conf = &local->hw.conf;
 869
 870        WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 871                !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 872                (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 873
 874        local->disable_dynamic_ps = true;
 875        conf->dynamic_ps_timeout = 0;
 876        del_timer_sync(&local->dynamic_ps_timer);
 877        ieee80211_queue_work(&local->hw,
 878                             &local->dynamic_ps_enable_work);
 879}
 880EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 881
 882/* powersave */
 883static void ieee80211_enable_ps(struct ieee80211_local *local,
 884                                struct ieee80211_sub_if_data *sdata)
 885{
 886        struct ieee80211_conf *conf = &local->hw.conf;
 887
 888        /*
 889         * If we are scanning right now then the parameters will
 890         * take effect when scan finishes.
 891         */
 892        if (local->scanning)
 893                return;
 894
 895        if (conf->dynamic_ps_timeout > 0 &&
 896            !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 897                mod_timer(&local->dynamic_ps_timer, jiffies +
 898                          msecs_to_jiffies(conf->dynamic_ps_timeout));
 899        } else {
 900                if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 901                        ieee80211_send_nullfunc(local, sdata, 1);
 902
 903                if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 904                    (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 905                        return;
 906
 907                conf->flags |= IEEE80211_CONF_PS;
 908                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 909        }
 910}
 911
 912static void ieee80211_change_ps(struct ieee80211_local *local)
 913{
 914        struct ieee80211_conf *conf = &local->hw.conf;
 915
 916        if (local->ps_sdata) {
 917                ieee80211_enable_ps(local, local->ps_sdata);
 918        } else if (conf->flags & IEEE80211_CONF_PS) {
 919                conf->flags &= ~IEEE80211_CONF_PS;
 920                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 921                del_timer_sync(&local->dynamic_ps_timer);
 922                cancel_work_sync(&local->dynamic_ps_enable_work);
 923        }
 924}
 925
 926static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 927{
 928        struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 929        struct sta_info *sta = NULL;
 930        bool authorized = false;
 931
 932        if (!mgd->powersave)
 933                return false;
 934
 935        if (mgd->broken_ap)
 936                return false;
 937
 938        if (!mgd->associated)
 939                return false;
 940
 941        if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 942                          IEEE80211_STA_CONNECTION_POLL))
 943                return false;
 944
 945        rcu_read_lock();
 946        sta = sta_info_get(sdata, mgd->bssid);
 947        if (sta)
 948                authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 949        rcu_read_unlock();
 950
 951        return authorized;
 952}
 953
 954/* need to hold RTNL or interface lock */
 955void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 956{
 957        struct ieee80211_sub_if_data *sdata, *found = NULL;
 958        int count = 0;
 959        int timeout;
 960
 961        if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 962                local->ps_sdata = NULL;
 963                return;
 964        }
 965
 966        list_for_each_entry(sdata, &local->interfaces, list) {
 967                if (!ieee80211_sdata_running(sdata))
 968                        continue;
 969                if (sdata->vif.type == NL80211_IFTYPE_AP) {
 970                        /* If an AP vif is found, then disable PS
 971                         * by setting the count to zero thereby setting
 972                         * ps_sdata to NULL.
 973                         */
 974                        count = 0;
 975                        break;
 976                }
 977                if (sdata->vif.type != NL80211_IFTYPE_STATION)
 978                        continue;
 979                found = sdata;
 980                count++;
 981        }
 982
 983        if (count == 1 && ieee80211_powersave_allowed(found)) {
 984                struct ieee80211_conf *conf = &local->hw.conf;
 985                s32 beaconint_us;
 986
 987                if (latency < 0)
 988                        latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 989
 990                beaconint_us = ieee80211_tu_to_usec(
 991                                        found->vif.bss_conf.beacon_int);
 992
 993                timeout = local->dynamic_ps_forced_timeout;
 994                if (timeout < 0) {
 995                        /*
 996                         * Go to full PSM if the user configures a very low
 997                         * latency requirement.
 998                         * The 2000 second value is there for compatibility
 999                         * until the PM_QOS_NETWORK_LATENCY is configured
1000                         * with real values.
1001                         */
1002                        if (latency > (1900 * USEC_PER_MSEC) &&
1003                            latency != (2000 * USEC_PER_SEC))
1004                                timeout = 0;
1005                        else
1006                                timeout = 100;
1007                }
1008                local->dynamic_ps_user_timeout = timeout;
1009                if (!local->disable_dynamic_ps)
1010                        conf->dynamic_ps_timeout =
1011                                local->dynamic_ps_user_timeout;
1012
1013                if (beaconint_us > latency) {
1014                        local->ps_sdata = NULL;
1015                } else {
1016                        struct ieee80211_bss *bss;
1017                        int maxslp = 1;
1018                        u8 dtimper;
1019
1020                        bss = (void *)found->u.mgd.associated->priv;
1021                        dtimper = bss->dtim_period;
1022
1023                        /* If the TIM IE is invalid, pretend the value is 1 */
1024                        if (!dtimper)
1025                                dtimper = 1;
1026                        else if (dtimper > 1)
1027                                maxslp = min_t(int, dtimper,
1028                                                    latency / beaconint_us);
1029
1030                        local->hw.conf.max_sleep_period = maxslp;
1031                        local->hw.conf.ps_dtim_period = dtimper;
1032                        local->ps_sdata = found;
1033                }
1034        } else {
1035                local->ps_sdata = NULL;
1036        }
1037
1038        ieee80211_change_ps(local);
1039}
1040
1041void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1042{
1043        bool ps_allowed = ieee80211_powersave_allowed(sdata);
1044
1045        if (sdata->vif.bss_conf.ps != ps_allowed) {
1046                sdata->vif.bss_conf.ps = ps_allowed;
1047                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1048        }
1049}
1050
1051void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1052{
1053        struct ieee80211_local *local =
1054                container_of(work, struct ieee80211_local,
1055                             dynamic_ps_disable_work);
1056
1057        if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1058                local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1059                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1060        }
1061
1062        ieee80211_wake_queues_by_reason(&local->hw,
1063                                        IEEE80211_QUEUE_STOP_REASON_PS);
1064}
1065
1066void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1067{
1068        struct ieee80211_local *local =
1069                container_of(work, struct ieee80211_local,
1070                             dynamic_ps_enable_work);
1071        struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1072        struct ieee80211_if_managed *ifmgd;
1073        unsigned long flags;
1074        int q;
1075
1076        /* can only happen when PS was just disabled anyway */
1077        if (!sdata)
1078                return;
1079
1080        ifmgd = &sdata->u.mgd;
1081
1082        if (local->hw.conf.flags & IEEE80211_CONF_PS)
1083                return;
1084
1085        if (!local->disable_dynamic_ps &&
1086            local->hw.conf.dynamic_ps_timeout > 0) {
1087                /* don't enter PS if TX frames are pending */
1088                if (drv_tx_frames_pending(local)) {
1089                        mod_timer(&local->dynamic_ps_timer, jiffies +
1090                                  msecs_to_jiffies(
1091                                  local->hw.conf.dynamic_ps_timeout));
1092                        return;
1093                }
1094
1095                /*
1096                 * transmission can be stopped by others which leads to
1097                 * dynamic_ps_timer expiry. Postpone the ps timer if it
1098                 * is not the actual idle state.
1099                 */
1100                spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1101                for (q = 0; q < local->hw.queues; q++) {
1102                        if (local->queue_stop_reasons[q]) {
1103                                spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1104                                                       flags);
1105                                mod_timer(&local->dynamic_ps_timer, jiffies +
1106                                          msecs_to_jiffies(
1107                                          local->hw.conf.dynamic_ps_timeout));
1108                                return;
1109                        }
1110                }
1111                spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1112        }
1113
1114        if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1115            !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1116                netif_tx_stop_all_queues(sdata->dev);
1117
1118                if (drv_tx_frames_pending(local))
1119                        mod_timer(&local->dynamic_ps_timer, jiffies +
1120                                  msecs_to_jiffies(
1121                                  local->hw.conf.dynamic_ps_timeout));
1122                else {
1123                        ieee80211_send_nullfunc(local, sdata, 1);
1124                        /* Flush to get the tx status of nullfunc frame */
1125                        drv_flush(local, false);
1126                }
1127        }
1128
1129        if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1130              (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1131            (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1132                ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1133                local->hw.conf.flags |= IEEE80211_CONF_PS;
1134                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1135        }
1136
1137        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1138                netif_tx_wake_all_queues(sdata->dev);
1139}
1140
1141void ieee80211_dynamic_ps_timer(unsigned long data)
1142{
1143        struct ieee80211_local *local = (void *) data;
1144
1145        if (local->quiescing || local->suspended)
1146                return;
1147
1148        ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1149}
1150
1151/* MLME */
1152static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1153                                     struct ieee80211_sub_if_data *sdata,
1154                                     u8 *wmm_param, size_t wmm_param_len)
1155{
1156        struct ieee80211_tx_queue_params params;
1157        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1158        size_t left;
1159        int count;
1160        u8 *pos, uapsd_queues = 0;
1161
1162        if (!local->ops->conf_tx)
1163                return false;
1164
1165        if (local->hw.queues < IEEE80211_NUM_ACS)
1166                return false;
1167
1168        if (!wmm_param)
1169                return false;
1170
1171        if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1172                return false;
1173
1174        if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1175                uapsd_queues = ifmgd->uapsd_queues;
1176
1177        count = wmm_param[6] & 0x0f;
1178        if (count == ifmgd->wmm_last_param_set)
1179                return false;
1180        ifmgd->wmm_last_param_set = count;
1181
1182        pos = wmm_param + 8;
1183        left = wmm_param_len - 8;
1184
1185        memset(&params, 0, sizeof(params));
1186
1187        sdata->wmm_acm = 0;
1188        for (; left >= 4; left -= 4, pos += 4) {
1189                int aci = (pos[0] >> 5) & 0x03;
1190                int acm = (pos[0] >> 4) & 0x01;
1191                bool uapsd = false;
1192                int queue;
1193
1194                switch (aci) {
1195                case 1: /* AC_BK */
1196                        queue = 3;
1197                        if (acm)
1198                                sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1199                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1200                                uapsd = true;
1201                        break;
1202                case 2: /* AC_VI */
1203                        queue = 1;
1204                        if (acm)
1205                                sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1206                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1207                                uapsd = true;
1208                        break;
1209                case 3: /* AC_VO */
1210                        queue = 0;
1211                        if (acm)
1212                                sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1213                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1214                                uapsd = true;
1215                        break;
1216                case 0: /* AC_BE */
1217                default:
1218                        queue = 2;
1219                        if (acm)
1220                                sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1221                        if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1222                                uapsd = true;
1223                        break;
1224                }
1225
1226                params.aifs = pos[0] & 0x0f;
1227                params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1228                params.cw_min = ecw2cw(pos[1] & 0x0f);
1229                params.txop = get_unaligned_le16(pos + 2);
1230                params.uapsd = uapsd;
1231
1232                mlme_dbg(sdata,
1233                         "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1234                         queue, aci, acm,
1235                         params.aifs, params.cw_min, params.cw_max,
1236                         params.txop, params.uapsd);
1237                sdata->tx_conf[queue] = params;
1238                if (drv_conf_tx(local, sdata, queue, &params))
1239                        sdata_err(sdata,
1240                                  "failed to set TX queue parameters for queue %d\n",
1241                                  queue);
1242        }
1243
1244        /* enable WMM or activate new settings */
1245        sdata->vif.bss_conf.qos = true;
1246        return true;
1247}
1248
1249static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1250{
1251        lockdep_assert_held(&sdata->local->mtx);
1252
1253        sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1254                                IEEE80211_STA_BEACON_POLL);
1255        ieee80211_run_deferred_scan(sdata->local);
1256}
1257
1258static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1259{
1260        mutex_lock(&sdata->local->mtx);
1261        __ieee80211_stop_poll(sdata);
1262        mutex_unlock(&sdata->local->mtx);
1263}
1264
1265static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1266                                           u16 capab, bool erp_valid, u8 erp)
1267{
1268        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1269        u32 changed = 0;
1270        bool use_protection;
1271        bool use_short_preamble;
1272        bool use_short_slot;
1273
1274        if (erp_valid) {
1275                use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1276                use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1277        } else {
1278                use_protection = false;
1279                use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1280        }
1281
1282        use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1283        if (sdata->local->oper_channel->band == IEEE80211_BAND_5GHZ)
1284                use_short_slot = true;
1285
1286        if (use_protection != bss_conf->use_cts_prot) {
1287                bss_conf->use_cts_prot = use_protection;
1288                changed |= BSS_CHANGED_ERP_CTS_PROT;
1289        }
1290
1291        if (use_short_preamble != bss_conf->use_short_preamble) {
1292                bss_conf->use_short_preamble = use_short_preamble;
1293                changed |= BSS_CHANGED_ERP_PREAMBLE;
1294        }
1295
1296        if (use_short_slot != bss_conf->use_short_slot) {
1297                bss_conf->use_short_slot = use_short_slot;
1298                changed |= BSS_CHANGED_ERP_SLOT;
1299        }
1300
1301        return changed;
1302}
1303
1304static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1305                                     struct cfg80211_bss *cbss,
1306                                     u32 bss_info_changed)
1307{
1308        struct ieee80211_bss *bss = (void *)cbss->priv;
1309        struct ieee80211_local *local = sdata->local;
1310        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1311
1312        bss_info_changed |= BSS_CHANGED_ASSOC;
1313        bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1314                bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1315
1316        sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1317                IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1318
1319        sdata->u.mgd.associated = cbss;
1320        memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1321
1322        sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1323
1324        /* just to be sure */
1325        ieee80211_stop_poll(sdata);
1326
1327        ieee80211_led_assoc(local, 1);
1328
1329        if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1330                bss_conf->dtim_period = bss->dtim_period;
1331        else
1332                bss_conf->dtim_period = 0;
1333
1334        bss_conf->assoc = 1;
1335
1336        /* Tell the driver to monitor connection quality (if supported) */
1337        if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1338            bss_conf->cqm_rssi_thold)
1339                bss_info_changed |= BSS_CHANGED_CQM;
1340
1341        /* Enable ARP filtering */
1342        if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1343                bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1344                bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1345        }
1346
1347        ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1348
1349        mutex_lock(&local->iflist_mtx);
1350        ieee80211_recalc_ps(local, -1);
1351        mutex_unlock(&local->iflist_mtx);
1352
1353        ieee80211_recalc_smps(local);
1354        ieee80211_recalc_ps_vif(sdata);
1355
1356        netif_tx_start_all_queues(sdata->dev);
1357        netif_carrier_on(sdata->dev);
1358}
1359
1360static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1361                                   u16 stype, u16 reason, bool tx,
1362                                   u8 *frame_buf)
1363{
1364        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1365        struct ieee80211_local *local = sdata->local;
1366        struct sta_info *sta;
1367        u32 changed = 0;
1368
1369        ASSERT_MGD_MTX(ifmgd);
1370
1371        if (WARN_ON_ONCE(tx && !frame_buf))
1372                return;
1373
1374        if (WARN_ON(!ifmgd->associated))
1375                return;
1376
1377        ieee80211_stop_poll(sdata);
1378
1379        ifmgd->associated = NULL;
1380
1381        /*
1382         * we need to commit the associated = NULL change because the
1383         * scan code uses that to determine whether this iface should
1384         * go to/wake up from powersave or not -- and could otherwise
1385         * wake the queues erroneously.
1386         */
1387        smp_mb();
1388
1389        /*
1390         * Thus, we can only afterwards stop the queues -- to account
1391         * for the case where another CPU is finishing a scan at this
1392         * time -- we don't want the scan code to enable queues.
1393         */
1394
1395        netif_tx_stop_all_queues(sdata->dev);
1396        netif_carrier_off(sdata->dev);
1397
1398        mutex_lock(&local->sta_mtx);
1399        sta = sta_info_get(sdata, ifmgd->bssid);
1400        if (sta) {
1401                set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1402                ieee80211_sta_tear_down_BA_sessions(sta, false);
1403        }
1404        mutex_unlock(&local->sta_mtx);
1405
1406        /*
1407         * if we want to get out of ps before disassoc (why?) we have
1408         * to do it before sending disassoc, as otherwise the null-packet
1409         * won't be valid.
1410         */
1411        if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1412                local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1413                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1414        }
1415        local->ps_sdata = NULL;
1416
1417        /* disable per-vif ps */
1418        ieee80211_recalc_ps_vif(sdata);
1419
1420        /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1421        if (tx)
1422                drv_flush(local, false);
1423
1424        /* deauthenticate/disassociate now */
1425        if (tx || frame_buf)
1426                ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1427                                               reason, tx, frame_buf);
1428
1429        /* flush out frame */
1430        if (tx)
1431                drv_flush(local, false);
1432
1433        /* clear bssid only after building the needed mgmt frames */
1434        memset(ifmgd->bssid, 0, ETH_ALEN);
1435
1436        /* remove AP and TDLS peers */
1437        sta_info_flush(local, sdata);
1438
1439        /* finally reset all BSS / config parameters */
1440        changed |= ieee80211_reset_erp_info(sdata);
1441
1442        ieee80211_led_assoc(local, 0);
1443        changed |= BSS_CHANGED_ASSOC;
1444        sdata->vif.bss_conf.assoc = false;
1445
1446        /* on the next assoc, re-program HT parameters */
1447        memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1448        memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1449
1450        local->ap_power_level = 0;
1451
1452        del_timer_sync(&local->dynamic_ps_timer);
1453        cancel_work_sync(&local->dynamic_ps_enable_work);
1454
1455        /* Disable ARP filtering */
1456        if (sdata->vif.bss_conf.arp_filter_enabled) {
1457                sdata->vif.bss_conf.arp_filter_enabled = false;
1458                changed |= BSS_CHANGED_ARP_FILTER;
1459        }
1460
1461        sdata->vif.bss_conf.qos = false;
1462        changed |= BSS_CHANGED_QOS;
1463
1464        /* The BSSID (not really interesting) and HT changed */
1465        changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1466        ieee80211_bss_info_change_notify(sdata, changed);
1467
1468        /* channel(_type) changes are handled by ieee80211_hw_config */
1469        WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1470        ieee80211_hw_config(local, 0);
1471
1472        /* disassociated - set to defaults now */
1473        ieee80211_set_wmm_default(sdata, false);
1474
1475        del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1476        del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1477        del_timer_sync(&sdata->u.mgd.timer);
1478        del_timer_sync(&sdata->u.mgd.chswitch_timer);
1479
1480        sdata->u.mgd.timers_running = 0;
1481}
1482
1483void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1484                             struct ieee80211_hdr *hdr)
1485{
1486        /*
1487         * We can postpone the mgd.timer whenever receiving unicast frames
1488         * from AP because we know that the connection is working both ways
1489         * at that time. But multicast frames (and hence also beacons) must
1490         * be ignored here, because we need to trigger the timer during
1491         * data idle periods for sending the periodic probe request to the
1492         * AP we're connected to.
1493         */
1494        if (is_multicast_ether_addr(hdr->addr1))
1495                return;
1496
1497        ieee80211_sta_reset_conn_monitor(sdata);
1498}
1499
1500static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1501{
1502        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1503        struct ieee80211_local *local = sdata->local;
1504
1505        mutex_lock(&local->mtx);
1506        if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1507                              IEEE80211_STA_CONNECTION_POLL))) {
1508                mutex_unlock(&local->mtx);
1509                return;
1510        }
1511
1512        __ieee80211_stop_poll(sdata);
1513
1514        mutex_lock(&local->iflist_mtx);
1515        ieee80211_recalc_ps(local, -1);
1516        mutex_unlock(&local->iflist_mtx);
1517
1518        if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1519                goto out;
1520
1521        /*
1522         * We've received a probe response, but are not sure whether
1523         * we have or will be receiving any beacons or data, so let's
1524         * schedule the timers again, just in case.
1525         */
1526        ieee80211_sta_reset_beacon_monitor(sdata);
1527
1528        mod_timer(&ifmgd->conn_mon_timer,
1529                  round_jiffies_up(jiffies +
1530                                   IEEE80211_CONNECTION_IDLE_TIME));
1531out:
1532        mutex_unlock(&local->mtx);
1533}
1534
1535void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1536                             struct ieee80211_hdr *hdr, bool ack)
1537{
1538        if (!ieee80211_is_data(hdr->frame_control))
1539            return;
1540
1541        if (ack)
1542                ieee80211_sta_reset_conn_monitor(sdata);
1543
1544        if (ieee80211_is_nullfunc(hdr->frame_control) &&
1545            sdata->u.mgd.probe_send_count > 0) {
1546                if (ack)
1547                        sdata->u.mgd.probe_send_count = 0;
1548                else
1549                        sdata->u.mgd.nullfunc_failed = true;
1550                ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1551        }
1552}
1553
1554static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1555{
1556        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1557        const u8 *ssid;
1558        u8 *dst = ifmgd->associated->bssid;
1559        u8 unicast_limit = max(1, max_probe_tries - 3);
1560
1561        /*
1562         * Try sending broadcast probe requests for the last three
1563         * probe requests after the first ones failed since some
1564         * buggy APs only support broadcast probe requests.
1565         */
1566        if (ifmgd->probe_send_count >= unicast_limit)
1567                dst = NULL;
1568
1569        /*
1570         * When the hardware reports an accurate Tx ACK status, it's
1571         * better to send a nullfunc frame instead of a probe request,
1572         * as it will kick us off the AP quickly if we aren't associated
1573         * anymore. The timeout will be reset if the frame is ACKed by
1574         * the AP.
1575         */
1576        ifmgd->probe_send_count++;
1577
1578        if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1579                ifmgd->nullfunc_failed = false;
1580                ieee80211_send_nullfunc(sdata->local, sdata, 0);
1581        } else {
1582                int ssid_len;
1583
1584                ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1585                if (WARN_ON_ONCE(ssid == NULL))
1586                        ssid_len = 0;
1587                else
1588                        ssid_len = ssid[1];
1589
1590                ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1591                                         0, (u32) -1, true, false,
1592                                         ifmgd->associated->channel);
1593        }
1594
1595        ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1596        run_again(ifmgd, ifmgd->probe_timeout);
1597        if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1598                drv_flush(sdata->local, false);
1599}
1600
1601static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1602                                   bool beacon)
1603{
1604        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1605        bool already = false;
1606
1607        if (!ieee80211_sdata_running(sdata))
1608                return;
1609
1610        mutex_lock(&ifmgd->mtx);
1611
1612        if (!ifmgd->associated)
1613                goto out;
1614
1615        mutex_lock(&sdata->local->mtx);
1616
1617        if (sdata->local->tmp_channel || sdata->local->scanning) {
1618                mutex_unlock(&sdata->local->mtx);
1619                goto out;
1620        }
1621
1622        if (beacon)
1623                mlme_dbg_ratelimited(sdata,
1624                                     "detected beacon loss from AP - sending probe request\n");
1625
1626        ieee80211_cqm_rssi_notify(&sdata->vif,
1627                NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1628
1629        /*
1630         * The driver/our work has already reported this event or the
1631         * connection monitoring has kicked in and we have already sent
1632         * a probe request. Or maybe the AP died and the driver keeps
1633         * reporting until we disassociate...
1634         *
1635         * In either case we have to ignore the current call to this
1636         * function (except for setting the correct probe reason bit)
1637         * because otherwise we would reset the timer every time and
1638         * never check whether we received a probe response!
1639         */
1640        if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1641                            IEEE80211_STA_CONNECTION_POLL))
1642                already = true;
1643
1644        if (beacon)
1645                ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1646        else
1647                ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1648
1649        mutex_unlock(&sdata->local->mtx);
1650
1651        if (already)
1652                goto out;
1653
1654        mutex_lock(&sdata->local->iflist_mtx);
1655        ieee80211_recalc_ps(sdata->local, -1);
1656        mutex_unlock(&sdata->local->iflist_mtx);
1657
1658        ifmgd->probe_send_count = 0;
1659        ieee80211_mgd_probe_ap_send(sdata);
1660 out:
1661        mutex_unlock(&ifmgd->mtx);
1662}
1663
1664struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1665                                          struct ieee80211_vif *vif)
1666{
1667        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1668        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1669        struct cfg80211_bss *cbss;
1670        struct sk_buff *skb;
1671        const u8 *ssid;
1672        int ssid_len;
1673
1674        if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1675                return NULL;
1676
1677        ASSERT_MGD_MTX(ifmgd);
1678
1679        if (ifmgd->associated)
1680                cbss = ifmgd->associated;
1681        else if (ifmgd->auth_data)
1682                cbss = ifmgd->auth_data->bss;
1683        else if (ifmgd->assoc_data)
1684                cbss = ifmgd->assoc_data->bss;
1685        else
1686                return NULL;
1687
1688        ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1689        if (WARN_ON_ONCE(ssid == NULL))
1690                ssid_len = 0;
1691        else
1692                ssid_len = ssid[1];
1693
1694        skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1695                                        (u32) -1,
1696                                        sdata->local->oper_channel,
1697                                        ssid + 2, ssid_len,
1698                                        NULL, 0, true);
1699
1700        return skb;
1701}
1702EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1703
1704static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata,
1705                                   bool transmit_frame)
1706{
1707        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1708        struct ieee80211_local *local = sdata->local;
1709        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1710
1711        mutex_lock(&ifmgd->mtx);
1712        if (!ifmgd->associated) {
1713                mutex_unlock(&ifmgd->mtx);
1714                return;
1715        }
1716
1717        ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1718                               WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1719                               transmit_frame, frame_buf);
1720        ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1721        mutex_unlock(&ifmgd->mtx);
1722
1723        /*
1724         * must be outside lock due to cfg80211,
1725         * but that's not a problem.
1726         */
1727        cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
1728
1729        mutex_lock(&local->mtx);
1730        ieee80211_recalc_idle(local);
1731        mutex_unlock(&local->mtx);
1732}
1733
1734static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1735{
1736        struct ieee80211_sub_if_data *sdata =
1737                container_of(work, struct ieee80211_sub_if_data,
1738                             u.mgd.beacon_connection_loss_work);
1739        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1740        struct sta_info *sta;
1741
1742        if (ifmgd->associated) {
1743                rcu_read_lock();
1744                sta = sta_info_get(sdata, ifmgd->bssid);
1745                if (sta)
1746                        sta->beacon_loss_count++;
1747                rcu_read_unlock();
1748        }
1749
1750        if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) {
1751                sdata_info(sdata, "Connection to AP %pM lost\n",
1752                           ifmgd->bssid);
1753                __ieee80211_disconnect(sdata, false);
1754        } else {
1755                ieee80211_mgd_probe_ap(sdata, true);
1756        }
1757}
1758
1759static void ieee80211_csa_connection_drop_work(struct work_struct *work)
1760{
1761        struct ieee80211_sub_if_data *sdata =
1762                container_of(work, struct ieee80211_sub_if_data,
1763                             u.mgd.csa_connection_drop_work);
1764
1765        ieee80211_wake_queues_by_reason(&sdata->local->hw,
1766                                        IEEE80211_QUEUE_STOP_REASON_CSA);
1767        __ieee80211_disconnect(sdata, true);
1768}
1769
1770void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1771{
1772        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1773        struct ieee80211_hw *hw = &sdata->local->hw;
1774
1775        trace_api_beacon_loss(sdata);
1776
1777        WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1778        ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1779}
1780EXPORT_SYMBOL(ieee80211_beacon_loss);
1781
1782void ieee80211_connection_loss(struct ieee80211_vif *vif)
1783{
1784        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1785        struct ieee80211_hw *hw = &sdata->local->hw;
1786
1787        trace_api_connection_loss(sdata);
1788
1789        WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1790        ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1791}
1792EXPORT_SYMBOL(ieee80211_connection_loss);
1793
1794
1795static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1796                                        bool assoc)
1797{
1798        struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1799
1800        lockdep_assert_held(&sdata->u.mgd.mtx);
1801
1802        if (!assoc) {
1803                sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1804
1805                memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1806                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1807        }
1808
1809        cfg80211_put_bss(auth_data->bss);
1810        kfree(auth_data);
1811        sdata->u.mgd.auth_data = NULL;
1812}
1813
1814static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1815                                     struct ieee80211_mgmt *mgmt, size_t len)
1816{
1817        struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1818        u8 *pos;
1819        struct ieee802_11_elems elems;
1820
1821        pos = mgmt->u.auth.variable;
1822        ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1823        if (!elems.challenge)
1824                return;
1825        auth_data->expected_transaction = 4;
1826        drv_mgd_prepare_tx(sdata->local, sdata);
1827        ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1828                            elems.challenge - 2, elems.challenge_len + 2,
1829                            auth_data->bss->bssid, auth_data->bss->bssid,
1830                            auth_data->key, auth_data->key_len,
1831                            auth_data->key_idx);
1832}
1833
1834static enum rx_mgmt_action __must_check
1835ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1836                       struct ieee80211_mgmt *mgmt, size_t len)
1837{
1838        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1839        u8 bssid[ETH_ALEN];
1840        u16 auth_alg, auth_transaction, status_code;
1841        struct sta_info *sta;
1842
1843        lockdep_assert_held(&ifmgd->mtx);
1844
1845        if (len < 24 + 6)
1846                return RX_MGMT_NONE;
1847
1848        if (!ifmgd->auth_data || ifmgd->auth_data->done)
1849                return RX_MGMT_NONE;
1850
1851        memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1852
1853        if (!ether_addr_equal(bssid, mgmt->bssid))
1854                return RX_MGMT_NONE;
1855
1856        auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1857        auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1858        status_code = le16_to_cpu(mgmt->u.auth.status_code);
1859
1860        if (auth_alg != ifmgd->auth_data->algorithm ||
1861            auth_transaction != ifmgd->auth_data->expected_transaction)
1862                return RX_MGMT_NONE;
1863
1864        if (status_code != WLAN_STATUS_SUCCESS) {
1865                sdata_info(sdata, "%pM denied authentication (status %d)\n",
1866                           mgmt->sa, status_code);
1867                ieee80211_destroy_auth_data(sdata, false);
1868                return RX_MGMT_CFG80211_RX_AUTH;
1869        }
1870
1871        switch (ifmgd->auth_data->algorithm) {
1872        case WLAN_AUTH_OPEN:
1873        case WLAN_AUTH_LEAP:
1874        case WLAN_AUTH_FT:
1875                break;
1876        case WLAN_AUTH_SHARED_KEY:
1877                if (ifmgd->auth_data->expected_transaction != 4) {
1878                        ieee80211_auth_challenge(sdata, mgmt, len);
1879                        /* need another frame */
1880                        return RX_MGMT_NONE;
1881                }
1882                break;
1883        default:
1884                WARN_ONCE(1, "invalid auth alg %d",
1885                          ifmgd->auth_data->algorithm);
1886                return RX_MGMT_NONE;
1887        }
1888
1889        sdata_info(sdata, "authenticated\n");
1890        ifmgd->auth_data->done = true;
1891        ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1892        run_again(ifmgd, ifmgd->auth_data->timeout);
1893
1894        /* move station state to auth */
1895        mutex_lock(&sdata->local->sta_mtx);
1896        sta = sta_info_get(sdata, bssid);
1897        if (!sta) {
1898                WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1899                goto out_err;
1900        }
1901        if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1902                sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1903                goto out_err;
1904        }
1905        mutex_unlock(&sdata->local->sta_mtx);
1906
1907        return RX_MGMT_CFG80211_RX_AUTH;
1908 out_err:
1909        mutex_unlock(&sdata->local->sta_mtx);
1910        /* ignore frame -- wait for timeout */
1911        return RX_MGMT_NONE;
1912}
1913
1914
1915static enum rx_mgmt_action __must_check
1916ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1917                         struct ieee80211_mgmt *mgmt, size_t len)
1918{
1919        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1920        const u8 *bssid = NULL;
1921        u16 reason_code;
1922
1923        lockdep_assert_held(&ifmgd->mtx);
1924
1925        if (len < 24 + 2)
1926                return RX_MGMT_NONE;
1927
1928        if (!ifmgd->associated ||
1929            !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1930                return RX_MGMT_NONE;
1931
1932        bssid = ifmgd->associated->bssid;
1933
1934        reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1935
1936        sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1937                   bssid, reason_code);
1938
1939        ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1940
1941        mutex_lock(&sdata->local->mtx);
1942        ieee80211_recalc_idle(sdata->local);
1943        mutex_unlock(&sdata->local->mtx);
1944
1945        return RX_MGMT_CFG80211_DEAUTH;
1946}
1947
1948
1949static enum rx_mgmt_action __must_check
1950ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1951                           struct ieee80211_mgmt *mgmt, size_t len)
1952{
1953        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1954        u16 reason_code;
1955
1956        lockdep_assert_held(&ifmgd->mtx);
1957
1958        if (len < 24 + 2)
1959                return RX_MGMT_NONE;
1960
1961        if (!ifmgd->associated ||
1962            !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1963                return RX_MGMT_NONE;
1964
1965        reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1966
1967        sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1968                   mgmt->sa, reason_code);
1969
1970        ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1971
1972        mutex_lock(&sdata->local->mtx);
1973        ieee80211_recalc_idle(sdata->local);
1974        mutex_unlock(&sdata->local->mtx);
1975
1976        return RX_MGMT_CFG80211_DISASSOC;
1977}
1978
1979static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1980                                u8 *supp_rates, unsigned int supp_rates_len,
1981                                u32 *rates, u32 *basic_rates,
1982                                bool *have_higher_than_11mbit,
1983                                int *min_rate, int *min_rate_index)
1984{
1985        int i, j;
1986
1987        for (i = 0; i < supp_rates_len; i++) {
1988                int rate = (supp_rates[i] & 0x7f) * 5;
1989                bool is_basic = !!(supp_rates[i] & 0x80);
1990
1991                if (rate > 110)
1992                        *have_higher_than_11mbit = true;
1993
1994                /*
1995                 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1996                 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1997                 *
1998                 * Note: Even through the membership selector and the basic
1999                 *       rate flag share the same bit, they are not exactly
2000                 *       the same.
2001                 */
2002                if (!!(supp_rates[i] & 0x80) &&
2003                    (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2004                        continue;
2005
2006                for (j = 0; j < sband->n_bitrates; j++) {
2007                        if (sband->bitrates[j].bitrate == rate) {
2008                                *rates |= BIT(j);
2009                                if (is_basic)
2010                                        *basic_rates |= BIT(j);
2011                                if (rate < *min_rate) {
2012                                        *min_rate = rate;
2013                                        *min_rate_index = j;
2014                                }
2015                                break;
2016                        }
2017                }
2018        }
2019}
2020
2021static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2022                                         bool assoc)
2023{
2024        struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2025
2026        lockdep_assert_held(&sdata->u.mgd.mtx);
2027
2028        if (!assoc) {
2029                sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2030
2031                memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2032                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2033        }
2034
2035        kfree(assoc_data);
2036        sdata->u.mgd.assoc_data = NULL;
2037}
2038
2039static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2040                                    struct cfg80211_bss *cbss,
2041                                    struct ieee80211_mgmt *mgmt, size_t len)
2042{
2043        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2044        struct ieee80211_local *local = sdata->local;
2045        struct ieee80211_supported_band *sband;
2046        struct sta_info *sta;
2047        u8 *pos;
2048        u16 capab_info, aid;
2049        struct ieee802_11_elems elems;
2050        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2051        u32 changed = 0;
2052        int err;
2053
2054        /* AssocResp and ReassocResp have identical structure */
2055
2056        aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2057        capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2058
2059        if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2060                sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2061                           aid);
2062        aid &= ~(BIT(15) | BIT(14));
2063
2064        ifmgd->broken_ap = false;
2065
2066        if (aid == 0 || aid > IEEE80211_MAX_AID) {
2067                sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2068                           aid);
2069                aid = 0;
2070                ifmgd->broken_ap = true;
2071        }
2072
2073        pos = mgmt->u.assoc_resp.variable;
2074        ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2075
2076        if (!elems.supp_rates) {
2077                sdata_info(sdata, "no SuppRates element in AssocResp\n");
2078                return false;
2079        }
2080
2081        ifmgd->aid = aid;
2082
2083        mutex_lock(&sdata->local->sta_mtx);
2084        /*
2085         * station info was already allocated and inserted before
2086         * the association and should be available to us
2087         */
2088        sta = sta_info_get(sdata, cbss->bssid);
2089        if (WARN_ON(!sta)) {
2090                mutex_unlock(&sdata->local->sta_mtx);
2091                return false;
2092        }
2093
2094        sband = local->hw.wiphy->bands[local->oper_channel->band];
2095
2096        if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2097                ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2098                                elems.ht_cap_elem, &sta->sta.ht_cap);
2099
2100        sta->supports_40mhz =
2101                sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2102
2103        rate_control_rate_init(sta);
2104
2105        if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2106                set_sta_flag(sta, WLAN_STA_MFP);
2107
2108        if (elems.wmm_param)
2109                set_sta_flag(sta, WLAN_STA_WME);
2110
2111        err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2112        if (!err)
2113                err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2114        if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2115                err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2116        if (err) {
2117                sdata_info(sdata,
2118                           "failed to move station %pM to desired state\n",
2119                           sta->sta.addr);
2120                WARN_ON(__sta_info_destroy(sta));
2121                mutex_unlock(&sdata->local->sta_mtx);
2122                return false;
2123        }
2124
2125        mutex_unlock(&sdata->local->sta_mtx);
2126
2127        /*
2128         * Always handle WMM once after association regardless
2129         * of the first value the AP uses. Setting -1 here has
2130         * that effect because the AP values is an unsigned
2131         * 4-bit value.
2132         */
2133        ifmgd->wmm_last_param_set = -1;
2134
2135        if (elems.wmm_param)
2136                ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2137                                         elems.wmm_param_len);
2138        else
2139                ieee80211_set_wmm_default(sdata, false);
2140        changed |= BSS_CHANGED_QOS;
2141
2142        if (elems.ht_operation && elems.wmm_param &&
2143            !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2144                changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2145                                                  cbss->bssid, false);
2146
2147        /* set AID and assoc capability,
2148         * ieee80211_set_associated() will tell the driver */
2149        bss_conf->aid = aid;
2150        bss_conf->assoc_capability = capab_info;
2151        ieee80211_set_associated(sdata, cbss, changed);
2152
2153        /*
2154         * If we're using 4-addr mode, let the AP know that we're
2155         * doing so, so that it can create the STA VLAN on its side
2156         */
2157        if (ifmgd->use_4addr)
2158                ieee80211_send_4addr_nullfunc(local, sdata);
2159
2160        /*
2161         * Start timer to probe the connection to the AP now.
2162         * Also start the timer that will detect beacon loss.
2163         */
2164        ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2165        ieee80211_sta_reset_beacon_monitor(sdata);
2166
2167        return true;
2168}
2169
2170static enum rx_mgmt_action __must_check
2171ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2172                             struct ieee80211_mgmt *mgmt, size_t len,
2173                             struct cfg80211_bss **bss)
2174{
2175        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2176        struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2177        u16 capab_info, status_code, aid;
2178        struct ieee802_11_elems elems;
2179        u8 *pos;
2180        bool reassoc;
2181
2182        lockdep_assert_held(&ifmgd->mtx);
2183
2184        if (!assoc_data)
2185                return RX_MGMT_NONE;
2186        if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2187                return RX_MGMT_NONE;
2188
2189        /*
2190         * AssocResp and ReassocResp have identical structure, so process both
2191         * of them in this function.
2192         */
2193
2194        if (len < 24 + 6)
2195                return RX_MGMT_NONE;
2196
2197        reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2198        capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2199        status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2200        aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2201
2202        sdata_info(sdata,
2203                   "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2204                   reassoc ? "Rea" : "A", mgmt->sa,
2205                   capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2206
2207        pos = mgmt->u.assoc_resp.variable;
2208        ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2209
2210        if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2211            elems.timeout_int && elems.timeout_int_len == 5 &&
2212            elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2213                u32 tu, ms;
2214                tu = get_unaligned_le32(elems.timeout_int + 1);
2215                ms = tu * 1024 / 1000;
2216                sdata_info(sdata,
2217                           "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2218                           mgmt->sa, tu, ms);
2219                assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2220                if (ms > IEEE80211_ASSOC_TIMEOUT)
2221                        run_again(ifmgd, assoc_data->timeout);
2222                return RX_MGMT_NONE;
2223        }
2224
2225        *bss = assoc_data->bss;
2226
2227        if (status_code != WLAN_STATUS_SUCCESS) {
2228                sdata_info(sdata, "%pM denied association (code=%d)\n",
2229                           mgmt->sa, status_code);
2230                ieee80211_destroy_assoc_data(sdata, false);
2231        } else {
2232                if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2233                        /* oops -- internal error -- send timeout for now */
2234                        ieee80211_destroy_assoc_data(sdata, false);
2235                        cfg80211_put_bss(*bss);
2236                        return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2237                }
2238                sdata_info(sdata, "associated\n");
2239
2240                /*
2241                 * destroy assoc_data afterwards, as otherwise an idle
2242                 * recalc after assoc_data is NULL but before associated
2243                 * is set can cause the interface to go idle
2244                 */
2245                ieee80211_destroy_assoc_data(sdata, true);
2246        }
2247
2248        return RX_MGMT_CFG80211_RX_ASSOC;
2249}
2250static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2251                                  struct ieee80211_mgmt *mgmt,
2252                                  size_t len,
2253                                  struct ieee80211_rx_status *rx_status,
2254                                  struct ieee802_11_elems *elems,
2255                                  bool beacon)
2256{
2257        struct ieee80211_local *local = sdata->local;
2258        int freq;
2259        struct ieee80211_bss *bss;
2260        struct ieee80211_channel *channel;
2261        bool need_ps = false;
2262
2263        if (sdata->u.mgd.associated &&
2264            ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2265                bss = (void *)sdata->u.mgd.associated->priv;
2266                /* not previously set so we may need to recalc */
2267                need_ps = !bss->dtim_period;
2268        }
2269
2270        if (elems->ds_params && elems->ds_params_len == 1)
2271                freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2272                                                      rx_status->band);
2273        else
2274                freq = rx_status->freq;
2275
2276        channel = ieee80211_get_channel(local->hw.wiphy, freq);
2277
2278        if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2279                return;
2280
2281        bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2282                                        channel, beacon);
2283        if (bss)
2284                ieee80211_rx_bss_put(local, bss);
2285
2286        if (!sdata->u.mgd.associated)
2287                return;
2288
2289        if (need_ps) {
2290                mutex_lock(&local->iflist_mtx);
2291                ieee80211_recalc_ps(local, -1);
2292                mutex_unlock(&local->iflist_mtx);
2293        }
2294
2295        if (elems->ch_switch_ie &&
2296            memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2297                ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2298                                                 bss, rx_status->mactime);
2299}
2300
2301
2302static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2303                                         struct sk_buff *skb)
2304{
2305        struct ieee80211_mgmt *mgmt = (void *)skb->data;
2306        struct ieee80211_if_managed *ifmgd;
2307        struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2308        size_t baselen, len = skb->len;
2309        struct ieee802_11_elems elems;
2310
2311        ifmgd = &sdata->u.mgd;
2312
2313        ASSERT_MGD_MTX(ifmgd);
2314
2315        if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2316                return; /* ignore ProbeResp to foreign address */
2317
2318        baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2319        if (baselen > len)
2320                return;
2321
2322        ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2323                                &elems);
2324
2325        ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2326
2327        if (ifmgd->associated &&
2328            ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2329                ieee80211_reset_ap_probe(sdata);
2330
2331        if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2332            ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2333                /* got probe response, continue with auth */
2334                sdata_info(sdata, "direct probe responded\n");
2335                ifmgd->auth_data->tries = 0;
2336                ifmgd->auth_data->timeout = jiffies;
2337                run_again(ifmgd, ifmgd->auth_data->timeout);
2338        }
2339}
2340
2341/*
2342 * This is the canonical list of information elements we care about,
2343 * the filter code also gives us all changes to the Microsoft OUI
2344 * (00:50:F2) vendor IE which is used for WMM which we need to track.
2345 *
2346 * We implement beacon filtering in software since that means we can
2347 * avoid processing the frame here and in cfg80211, and userspace
2348 * will not be able to tell whether the hardware supports it or not.
2349 *
2350 * XXX: This list needs to be dynamic -- userspace needs to be able to
2351 *      add items it requires. It also needs to be able to tell us to
2352 *      look out for other vendor IEs.
2353 */
2354static const u64 care_about_ies =
2355        (1ULL << WLAN_EID_COUNTRY) |
2356        (1ULL << WLAN_EID_ERP_INFO) |
2357        (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2358        (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2359        (1ULL << WLAN_EID_HT_CAPABILITY) |
2360        (1ULL << WLAN_EID_HT_OPERATION);
2361
2362static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2363                                     struct ieee80211_mgmt *mgmt,
2364                                     size_t len,
2365                                     struct ieee80211_rx_status *rx_status)
2366{
2367        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2368        struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2369        size_t baselen;
2370        struct ieee802_11_elems elems;
2371        struct ieee80211_local *local = sdata->local;
2372        u32 changed = 0;
2373        bool erp_valid, directed_tim = false;
2374        u8 erp_value = 0;
2375        u32 ncrc;
2376        u8 *bssid;
2377
2378        lockdep_assert_held(&ifmgd->mtx);
2379
2380        /* Process beacon from the current BSS */
2381        baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2382        if (baselen > len)
2383                return;
2384
2385        if (rx_status->freq != local->oper_channel->center_freq)
2386                return;
2387
2388        if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2389            ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2390                ieee802_11_parse_elems(mgmt->u.beacon.variable,
2391                                       len - baselen, &elems);
2392
2393                ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2394                                      false);
2395                ifmgd->assoc_data->have_beacon = true;
2396                ifmgd->assoc_data->sent_assoc = false;
2397                /* continue assoc process */
2398                ifmgd->assoc_data->timeout = jiffies;
2399                run_again(ifmgd, ifmgd->assoc_data->timeout);
2400                return;
2401        }
2402
2403        if (!ifmgd->associated ||
2404            !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2405                return;
2406        bssid = ifmgd->associated->bssid;
2407
2408        /* Track average RSSI from the Beacon frames of the current AP */
2409        ifmgd->last_beacon_signal = rx_status->signal;
2410        if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2411                ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2412                ifmgd->ave_beacon_signal = rx_status->signal * 16;
2413                ifmgd->last_cqm_event_signal = 0;
2414                ifmgd->count_beacon_signal = 1;
2415                ifmgd->last_ave_beacon_signal = 0;
2416        } else {
2417                ifmgd->ave_beacon_signal =
2418                        (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2419                         (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2420                         ifmgd->ave_beacon_signal) / 16;
2421                ifmgd->count_beacon_signal++;
2422        }
2423
2424        if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2425            ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2426                int sig = ifmgd->ave_beacon_signal;
2427                int last_sig = ifmgd->last_ave_beacon_signal;
2428
2429                /*
2430                 * if signal crosses either of the boundaries, invoke callback
2431                 * with appropriate parameters
2432                 */
2433                if (sig > ifmgd->rssi_max_thold &&
2434                    (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2435                        ifmgd->last_ave_beacon_signal = sig;
2436                        drv_rssi_callback(local, RSSI_EVENT_HIGH);
2437                } else if (sig < ifmgd->rssi_min_thold &&
2438                           (last_sig >= ifmgd->rssi_max_thold ||
2439                           last_sig == 0)) {
2440                        ifmgd->last_ave_beacon_signal = sig;
2441                        drv_rssi_callback(local, RSSI_EVENT_LOW);
2442                }
2443        }
2444
2445        if (bss_conf->cqm_rssi_thold &&
2446            ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2447            !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2448                int sig = ifmgd->ave_beacon_signal / 16;
2449                int last_event = ifmgd->last_cqm_event_signal;
2450                int thold = bss_conf->cqm_rssi_thold;
2451                int hyst = bss_conf->cqm_rssi_hyst;
2452                if (sig < thold &&
2453                    (last_event == 0 || sig < last_event - hyst)) {
2454                        ifmgd->last_cqm_event_signal = sig;
2455                        ieee80211_cqm_rssi_notify(
2456                                &sdata->vif,
2457                                NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2458                                GFP_KERNEL);
2459                } else if (sig > thold &&
2460                           (last_event == 0 || sig > last_event + hyst)) {
2461                        ifmgd->last_cqm_event_signal = sig;
2462                        ieee80211_cqm_rssi_notify(
2463                                &sdata->vif,
2464                                NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2465                                GFP_KERNEL);
2466                }
2467        }
2468
2469        if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2470                mlme_dbg_ratelimited(sdata,
2471                                     "cancelling probereq poll due to a received beacon\n");
2472                mutex_lock(&local->mtx);
2473                ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2474                ieee80211_run_deferred_scan(local);
2475                mutex_unlock(&local->mtx);
2476
2477                mutex_lock(&local->iflist_mtx);
2478                ieee80211_recalc_ps(local, -1);
2479                mutex_unlock(&local->iflist_mtx);
2480        }
2481
2482        /*
2483         * Push the beacon loss detection into the future since
2484         * we are processing a beacon from the AP just now.
2485         */
2486        ieee80211_sta_reset_beacon_monitor(sdata);
2487
2488        ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2489        ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2490                                          len - baselen, &elems,
2491                                          care_about_ies, ncrc);
2492
2493        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2494                directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2495                                                   ifmgd->aid);
2496
2497        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2498                if (directed_tim) {
2499                        if (local->hw.conf.dynamic_ps_timeout > 0) {
2500                                if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2501                                        local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2502                                        ieee80211_hw_config(local,
2503                                                            IEEE80211_CONF_CHANGE_PS);
2504                                }
2505                                ieee80211_send_nullfunc(local, sdata, 0);
2506                        } else if (!local->pspolling && sdata->u.mgd.powersave) {
2507                                local->pspolling = true;
2508
2509                                /*
2510                                 * Here is assumed that the driver will be
2511                                 * able to send ps-poll frame and receive a
2512                                 * response even though power save mode is
2513                                 * enabled, but some drivers might require
2514                                 * to disable power save here. This needs
2515                                 * to be investigated.
2516                                 */
2517                                ieee80211_send_pspoll(local, sdata);
2518                        }
2519                }
2520        }
2521
2522        if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2523                return;
2524        ifmgd->beacon_crc = ncrc;
2525        ifmgd->beacon_crc_valid = true;
2526
2527        ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2528                              true);
2529
2530        if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2531                                     elems.wmm_param_len))
2532                changed |= BSS_CHANGED_QOS;
2533
2534        if (elems.erp_info && elems.erp_info_len >= 1) {
2535                erp_valid = true;
2536                erp_value = elems.erp_info[0];
2537        } else {
2538                erp_valid = false;
2539        }
2540        changed |= ieee80211_handle_bss_capability(sdata,
2541                        le16_to_cpu(mgmt->u.beacon.capab_info),
2542                        erp_valid, erp_value);
2543
2544
2545        if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2546            !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2547                struct ieee80211_supported_band *sband;
2548
2549                sband = local->hw.wiphy->bands[local->oper_channel->band];
2550
2551                changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2552                                                  bssid, true);
2553        }
2554
2555        if (elems.country_elem && elems.pwr_constr_elem &&
2556            mgmt->u.probe_resp.capab_info &
2557                                cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
2558                ieee80211_handle_pwr_constr(sdata, local->oper_channel,
2559                                            elems.country_elem,
2560                                            elems.country_elem_len,
2561                                            elems.pwr_constr_elem);
2562
2563        ieee80211_bss_info_change_notify(sdata, changed);
2564}
2565
2566void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2567                                  struct sk_buff *skb)
2568{
2569        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2570        struct ieee80211_rx_status *rx_status;
2571        struct ieee80211_mgmt *mgmt;
2572        struct cfg80211_bss *bss = NULL;
2573        enum rx_mgmt_action rma = RX_MGMT_NONE;
2574        u16 fc;
2575
2576        rx_status = (struct ieee80211_rx_status *) skb->cb;
2577        mgmt = (struct ieee80211_mgmt *) skb->data;
2578        fc = le16_to_cpu(mgmt->frame_control);
2579
2580        mutex_lock(&ifmgd->mtx);
2581
2582        switch (fc & IEEE80211_FCTL_STYPE) {
2583        case IEEE80211_STYPE_BEACON:
2584                ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2585                break;
2586        case IEEE80211_STYPE_PROBE_RESP:
2587                ieee80211_rx_mgmt_probe_resp(sdata, skb);
2588                break;
2589        case IEEE80211_STYPE_AUTH:
2590                rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2591                break;
2592        case IEEE80211_STYPE_DEAUTH:
2593                rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2594                break;
2595        case IEEE80211_STYPE_DISASSOC:
2596                rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2597                break;
2598        case IEEE80211_STYPE_ASSOC_RESP:
2599        case IEEE80211_STYPE_REASSOC_RESP:
2600                rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2601                break;
2602        case IEEE80211_STYPE_ACTION:
2603                switch (mgmt->u.action.category) {
2604                case WLAN_CATEGORY_SPECTRUM_MGMT:
2605                        ieee80211_sta_process_chanswitch(sdata,
2606                                        &mgmt->u.action.u.chan_switch.sw_elem,
2607                                        (void *)ifmgd->associated->priv,
2608                                        rx_status->mactime);
2609                        break;
2610                }
2611        }
2612        mutex_unlock(&ifmgd->mtx);
2613
2614        switch (rma) {
2615        case RX_MGMT_NONE:
2616                /* no action */
2617                break;
2618        case RX_MGMT_CFG80211_DEAUTH:
2619                cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2620                break;
2621        case RX_MGMT_CFG80211_DISASSOC:
2622                cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2623                break;
2624        case RX_MGMT_CFG80211_RX_AUTH:
2625                cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2626                break;
2627        case RX_MGMT_CFG80211_RX_ASSOC:
2628                cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2629                break;
2630        case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2631                cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2632                break;
2633        default:
2634                WARN(1, "unexpected: %d", rma);
2635        }
2636}
2637
2638static void ieee80211_sta_timer(unsigned long data)
2639{
2640        struct ieee80211_sub_if_data *sdata =
2641                (struct ieee80211_sub_if_data *) data;
2642        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2643        struct ieee80211_local *local = sdata->local;
2644
2645        if (local->quiescing) {
2646                set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2647                return;
2648        }
2649
2650        ieee80211_queue_work(&local->hw, &sdata->work);
2651}
2652
2653static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2654                                          u8 *bssid, u8 reason)
2655{
2656        struct ieee80211_local *local = sdata->local;
2657        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2658        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2659
2660        ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2661                               false, frame_buf);
2662        mutex_unlock(&ifmgd->mtx);
2663
2664        /*
2665         * must be outside lock due to cfg80211,
2666         * but that's not a problem.
2667         */
2668        cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2669
2670        mutex_lock(&local->mtx);
2671        ieee80211_recalc_idle(local);
2672        mutex_unlock(&local->mtx);
2673
2674        mutex_lock(&ifmgd->mtx);
2675}
2676
2677static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2678{
2679        struct ieee80211_local *local = sdata->local;
2680        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2681        struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2682
2683        lockdep_assert_held(&ifmgd->mtx);
2684
2685        if (WARN_ON_ONCE(!auth_data))
2686                return -EINVAL;
2687
2688        auth_data->tries++;
2689
2690        if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2691                sdata_info(sdata, "authentication with %pM timed out\n",
2692                           auth_data->bss->bssid);
2693
2694                /*
2695                 * Most likely AP is not in the range so remove the
2696                 * bss struct for that AP.
2697                 */
2698                cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2699
2700                return -ETIMEDOUT;
2701        }
2702
2703        drv_mgd_prepare_tx(local, sdata);
2704
2705        if (auth_data->bss->proberesp_ies) {
2706                sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2707                           auth_data->bss->bssid, auth_data->tries,
2708                           IEEE80211_AUTH_MAX_TRIES);
2709
2710                auth_data->expected_transaction = 2;
2711                ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2712                                    auth_data->ie, auth_data->ie_len,
2713                                    auth_data->bss->bssid,
2714                                    auth_data->bss->bssid, NULL, 0, 0);
2715        } else {
2716                const u8 *ssidie;
2717
2718                sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2719                           auth_data->bss->bssid, auth_data->tries,
2720                           IEEE80211_AUTH_MAX_TRIES);
2721
2722                ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2723                if (!ssidie)
2724                        return -EINVAL;
2725                /*
2726                 * Direct probe is sent to broadcast address as some APs
2727                 * will not answer to direct packet in unassociated state.
2728                 */
2729                ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2730                                         NULL, 0, (u32) -1, true, false,
2731                                         auth_data->bss->channel);
2732        }
2733
2734        auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2735        run_again(ifmgd, auth_data->timeout);
2736
2737        return 0;
2738}
2739
2740static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2741{
2742        struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2743        struct ieee80211_local *local = sdata->local;
2744
2745        lockdep_assert_held(&sdata->u.mgd.mtx);
2746
2747        assoc_data->tries++;
2748        if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2749                sdata_info(sdata, "association with %pM timed out\n",
2750                           assoc_data->bss->bssid);
2751
2752                /*
2753                 * Most likely AP is not in the range so remove the
2754                 * bss struct for that AP.
2755                 */
2756                cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2757
2758                return -ETIMEDOUT;
2759        }
2760
2761        sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2762                   assoc_data->bss->bssid, assoc_data->tries,
2763                   IEEE80211_ASSOC_MAX_TRIES);
2764        ieee80211_send_assoc(sdata);
2765
2766        assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2767        run_again(&sdata->u.mgd, assoc_data->timeout);
2768
2769        return 0;
2770}
2771
2772void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2773{
2774        struct ieee80211_local *local = sdata->local;
2775        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2776
2777        mutex_lock(&ifmgd->mtx);
2778
2779        if (ifmgd->auth_data &&
2780            time_after(jiffies, ifmgd->auth_data->timeout)) {
2781                if (ifmgd->auth_data->done) {
2782                        /*
2783                         * ok ... we waited for assoc but userspace didn't,
2784                         * so let's just kill the auth data
2785                         */
2786                        ieee80211_destroy_auth_data(sdata, false);
2787                } else if (ieee80211_probe_auth(sdata)) {
2788                        u8 bssid[ETH_ALEN];
2789
2790                        memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2791
2792                        ieee80211_destroy_auth_data(sdata, false);
2793
2794                        mutex_unlock(&ifmgd->mtx);
2795                        cfg80211_send_auth_timeout(sdata->dev, bssid);
2796                        mutex_lock(&ifmgd->mtx);
2797                }
2798        } else if (ifmgd->auth_data)
2799                run_again(ifmgd, ifmgd->auth_data->timeout);
2800
2801        if (ifmgd->assoc_data &&
2802            time_after(jiffies, ifmgd->assoc_data->timeout)) {
2803                if (!ifmgd->assoc_data->have_beacon ||
2804                    ieee80211_do_assoc(sdata)) {
2805                        u8 bssid[ETH_ALEN];
2806
2807                        memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2808
2809                        ieee80211_destroy_assoc_data(sdata, false);
2810
2811                        mutex_unlock(&ifmgd->mtx);
2812                        cfg80211_send_assoc_timeout(sdata->dev, bssid);
2813                        mutex_lock(&ifmgd->mtx);
2814                }
2815        } else if (ifmgd->assoc_data)
2816                run_again(ifmgd, ifmgd->assoc_data->timeout);
2817
2818        if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2819                            IEEE80211_STA_CONNECTION_POLL) &&
2820            ifmgd->associated) {
2821                u8 bssid[ETH_ALEN];
2822                int max_tries;
2823
2824                memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2825
2826                if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2827                        max_tries = max_nullfunc_tries;
2828                else
2829                        max_tries = max_probe_tries;
2830
2831                /* ACK received for nullfunc probing frame */
2832                if (!ifmgd->probe_send_count)
2833                        ieee80211_reset_ap_probe(sdata);
2834                else if (ifmgd->nullfunc_failed) {
2835                        if (ifmgd->probe_send_count < max_tries) {
2836                                mlme_dbg(sdata,
2837                                         "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2838                                         bssid, ifmgd->probe_send_count,
2839                                         max_tries);
2840                                ieee80211_mgd_probe_ap_send(sdata);
2841                        } else {
2842                                mlme_dbg(sdata,
2843                                         "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2844                                         bssid);
2845                                ieee80211_sta_connection_lost(sdata, bssid,
2846                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2847                        }
2848                } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2849                        run_again(ifmgd, ifmgd->probe_timeout);
2850                else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2851                        mlme_dbg(sdata,
2852                                 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2853                                 bssid, probe_wait_ms);
2854                        ieee80211_sta_connection_lost(sdata, bssid,
2855                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2856                } else if (ifmgd->probe_send_count < max_tries) {
2857                        mlme_dbg(sdata,
2858                                 "No probe response from AP %pM after %dms, try %d/%i\n",
2859                                 bssid, probe_wait_ms,
2860                                 ifmgd->probe_send_count, max_tries);
2861                        ieee80211_mgd_probe_ap_send(sdata);
2862                } else {
2863                        /*
2864                         * We actually lost the connection ... or did we?
2865                         * Let's make sure!
2866                         */
2867                        wiphy_debug(local->hw.wiphy,
2868                                    "%s: No probe response from AP %pM"
2869                                    " after %dms, disconnecting.\n",
2870                                    sdata->name,
2871                                    bssid, probe_wait_ms);
2872
2873                        ieee80211_sta_connection_lost(sdata, bssid,
2874                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2875                }
2876        }
2877
2878        mutex_unlock(&ifmgd->mtx);
2879
2880        mutex_lock(&local->mtx);
2881        ieee80211_recalc_idle(local);
2882        mutex_unlock(&local->mtx);
2883}
2884
2885static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2886{
2887        struct ieee80211_sub_if_data *sdata =
2888                (struct ieee80211_sub_if_data *) data;
2889        struct ieee80211_local *local = sdata->local;
2890
2891        if (local->quiescing)
2892                return;
2893
2894        ieee80211_queue_work(&sdata->local->hw,
2895                             &sdata->u.mgd.beacon_connection_loss_work);
2896}
2897
2898static void ieee80211_sta_conn_mon_timer(unsigned long data)
2899{
2900        struct ieee80211_sub_if_data *sdata =
2901                (struct ieee80211_sub_if_data *) data;
2902        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2903        struct ieee80211_local *local = sdata->local;
2904
2905        if (local->quiescing)
2906                return;
2907
2908        ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2909}
2910
2911static void ieee80211_sta_monitor_work(struct work_struct *work)
2912{
2913        struct ieee80211_sub_if_data *sdata =
2914                container_of(work, struct ieee80211_sub_if_data,
2915                             u.mgd.monitor_work);
2916
2917        ieee80211_mgd_probe_ap(sdata, false);
2918}
2919
2920static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2921{
2922        u32 flags;
2923
2924        if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2925                __ieee80211_stop_poll(sdata);
2926
2927                /* let's probe the connection once */
2928                flags = sdata->local->hw.flags;
2929                if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2930                        ieee80211_queue_work(&sdata->local->hw,
2931                                             &sdata->u.mgd.monitor_work);
2932                /* and do all the other regular work too */
2933                ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2934        }
2935}
2936
2937#ifdef CONFIG_PM
2938void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2939{
2940        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2941
2942        /*
2943         * we need to use atomic bitops for the running bits
2944         * only because both timers might fire at the same
2945         * time -- the code here is properly synchronised.
2946         */
2947
2948        cancel_work_sync(&ifmgd->request_smps_work);
2949
2950        cancel_work_sync(&ifmgd->monitor_work);
2951        cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2952        cancel_work_sync(&ifmgd->csa_connection_drop_work);
2953        if (del_timer_sync(&ifmgd->timer))
2954                set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2955
2956        cancel_work_sync(&ifmgd->chswitch_work);
2957        if (del_timer_sync(&ifmgd->chswitch_timer))
2958                set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2959
2960        /* these will just be re-established on connection */
2961        del_timer_sync(&ifmgd->conn_mon_timer);
2962        del_timer_sync(&ifmgd->bcn_mon_timer);
2963}
2964
2965void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2966{
2967        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2968
2969        if (!ifmgd->associated)
2970                return;
2971
2972        if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2973                sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2974                mutex_lock(&ifmgd->mtx);
2975                if (ifmgd->associated) {
2976                        mlme_dbg(sdata,
2977                                 "driver requested disconnect after resume\n");
2978                        ieee80211_sta_connection_lost(sdata,
2979                                ifmgd->associated->bssid,
2980                                WLAN_REASON_UNSPECIFIED);
2981                        mutex_unlock(&ifmgd->mtx);
2982                        return;
2983                }
2984                mutex_unlock(&ifmgd->mtx);
2985        }
2986
2987        if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2988                add_timer(&ifmgd->timer);
2989        if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2990                add_timer(&ifmgd->chswitch_timer);
2991        ieee80211_sta_reset_beacon_monitor(sdata);
2992
2993        mutex_lock(&sdata->local->mtx);
2994        ieee80211_restart_sta_timer(sdata);
2995        mutex_unlock(&sdata->local->mtx);
2996}
2997#endif
2998
2999/* interface setup */
3000void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3001{
3002        struct ieee80211_if_managed *ifmgd;
3003
3004        ifmgd = &sdata->u.mgd;
3005        INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3006        INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3007        INIT_WORK(&ifmgd->beacon_connection_loss_work,
3008                  ieee80211_beacon_connection_loss_work);
3009        INIT_WORK(&ifmgd->csa_connection_drop_work,
3010                  ieee80211_csa_connection_drop_work);
3011        INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3012        setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3013                    (unsigned long) sdata);
3014        setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3015                    (unsigned long) sdata);
3016        setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3017                    (unsigned long) sdata);
3018        setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3019                    (unsigned long) sdata);
3020
3021        ifmgd->flags = 0;
3022        ifmgd->powersave = sdata->wdev.ps;
3023        ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3024        ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3025
3026        mutex_init(&ifmgd->mtx);
3027
3028        if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3029                ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3030        else
3031                ifmgd->req_smps = IEEE80211_SMPS_OFF;
3032}
3033
3034/* scan finished notification */
3035void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3036{
3037        struct ieee80211_sub_if_data *sdata;
3038
3039        /* Restart STA timers */
3040        rcu_read_lock();
3041        list_for_each_entry_rcu(sdata, &local->interfaces, list)
3042                ieee80211_restart_sta_timer(sdata);
3043        rcu_read_unlock();
3044}
3045
3046int ieee80211_max_network_latency(struct notifier_block *nb,
3047                                  unsigned long data, void *dummy)
3048{
3049        s32 latency_usec = (s32) data;
3050        struct ieee80211_local *local =
3051                container_of(nb, struct ieee80211_local,
3052                             network_latency_notifier);
3053
3054        mutex_lock(&local->iflist_mtx);
3055        ieee80211_recalc_ps(local, latency_usec);
3056        mutex_unlock(&local->iflist_mtx);
3057
3058        return 0;
3059}
3060
3061static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3062                                  struct cfg80211_bss *cbss)
3063{
3064        struct ieee80211_local *local = sdata->local;
3065        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3066        int ht_cfreq;
3067        enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3068        const u8 *ht_oper_ie;
3069        const struct ieee80211_ht_operation *ht_oper = NULL;
3070        struct ieee80211_supported_band *sband;
3071
3072        sband = local->hw.wiphy->bands[cbss->channel->band];
3073
3074        ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3075
3076        if (sband->ht_cap.ht_supported) {
3077                ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3078                                              cbss->information_elements,
3079                                              cbss->len_information_elements);
3080                if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3081                        ht_oper = (void *)(ht_oper_ie + 2);
3082        }
3083
3084        if (ht_oper) {
3085                ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3086                                                          cbss->channel->band);
3087                /* check that channel matches the right operating channel */
3088                if (cbss->channel->center_freq != ht_cfreq) {
3089                        /*
3090                         * It's possible that some APs are confused here;
3091                         * Netgear WNDR3700 sometimes reports 4 higher than
3092                         * the actual channel in association responses, but
3093                         * since we look at probe response/beacon data here
3094                         * it should be OK.
3095                         */
3096                        sdata_info(sdata,
3097                                   "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3098                                   cbss->channel->center_freq,
3099                                   ht_cfreq, ht_oper->primary_chan,
3100                                   cbss->channel->band);
3101                        ht_oper = NULL;
3102                } else {
3103                        channel_type = NL80211_CHAN_HT20;
3104                }
3105        }
3106
3107        if (ht_oper && sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3108                /*
3109                 * cfg80211 already verified that the channel itself can
3110                 * be used, but it didn't check that we can do the right
3111                 * HT type, so do that here as well. If HT40 isn't allowed
3112                 * on this channel, disable 40 MHz operation.
3113                 */
3114
3115                switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3116                case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3117                        if (cbss->channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
3118                                ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3119                        else
3120                                channel_type = NL80211_CHAN_HT40PLUS;
3121                        break;
3122                case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3123                        if (cbss->channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
3124                                ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3125                        else
3126                                channel_type = NL80211_CHAN_HT40MINUS;
3127                        break;
3128                }
3129        }
3130
3131        if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3132                /* can only fail due to HT40+/- mismatch */
3133                channel_type = NL80211_CHAN_HT20;
3134                sdata_info(sdata,
3135                           "disabling 40 MHz due to multi-vif mismatch\n");
3136                ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3137                WARN_ON(!ieee80211_set_channel_type(local, sdata,
3138                                                    channel_type));
3139        }
3140
3141        local->oper_channel = cbss->channel;
3142        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3143
3144        return 0;
3145}
3146
3147static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3148                                     struct cfg80211_bss *cbss, bool assoc)
3149{
3150        struct ieee80211_local *local = sdata->local;
3151        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3152        struct ieee80211_bss *bss = (void *)cbss->priv;
3153        struct sta_info *new_sta = NULL;
3154        bool have_sta = false;
3155        int err;
3156
3157        if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3158                return -EINVAL;
3159
3160        if (assoc) {
3161                rcu_read_lock();
3162                have_sta = sta_info_get(sdata, cbss->bssid);
3163                rcu_read_unlock();
3164        }
3165
3166        if (!have_sta) {
3167                new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3168                if (!new_sta)
3169                        return -ENOMEM;
3170        }
3171
3172        mutex_lock(&local->mtx);
3173        ieee80211_recalc_idle(sdata->local);
3174        mutex_unlock(&local->mtx);
3175
3176        if (new_sta) {
3177                u32 rates = 0, basic_rates = 0;
3178                bool have_higher_than_11mbit;
3179                int min_rate = INT_MAX, min_rate_index = -1;
3180                struct ieee80211_supported_band *sband;
3181
3182                sband = local->hw.wiphy->bands[cbss->channel->band];
3183
3184                err = ieee80211_prep_channel(sdata, cbss);
3185                if (err) {
3186                        sta_info_free(local, new_sta);
3187                        return err;
3188                }
3189
3190                ieee80211_get_rates(sband, bss->supp_rates,
3191                                    bss->supp_rates_len,
3192                                    &rates, &basic_rates,
3193                                    &have_higher_than_11mbit,
3194                                    &min_rate, &min_rate_index);
3195
3196                /*
3197                 * This used to be a workaround for basic rates missing
3198                 * in the association response frame. Now that we no
3199                 * longer use the basic rates from there, it probably
3200                 * doesn't happen any more, but keep the workaround so
3201                 * in case some *other* APs are buggy in different ways
3202                 * we can connect -- with a warning.
3203                 */
3204                if (!basic_rates && min_rate_index >= 0) {
3205                        sdata_info(sdata,
3206                                   "No basic rates, using min rate instead\n");
3207                        basic_rates = BIT(min_rate_index);
3208                }
3209
3210                new_sta->sta.supp_rates[cbss->channel->band] = rates;
3211                sdata->vif.bss_conf.basic_rates = basic_rates;
3212
3213                /* cf. IEEE 802.11 9.2.12 */
3214                if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3215                    have_higher_than_11mbit)
3216                        sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3217                else
3218                        sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3219
3220                memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3221
3222                /* set timing information */
3223                sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3224                sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3225                sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3226
3227                /* tell driver about BSSID, basic rates and timing */
3228                ieee80211_bss_info_change_notify(sdata,
3229                        BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3230                        BSS_CHANGED_BEACON_INT);
3231
3232                if (assoc)
3233                        sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3234
3235                err = sta_info_insert(new_sta);
3236                new_sta = NULL;
3237                if (err) {
3238                        sdata_info(sdata,
3239                                   "failed to insert STA entry for the AP (error %d)\n",
3240                                   err);
3241                        return err;
3242                }
3243        } else
3244                WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3245
3246        return 0;
3247}
3248
3249/* config hooks */
3250int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3251                       struct cfg80211_auth_request *req)
3252{
3253        struct ieee80211_local *local = sdata->local;
3254        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3255        struct ieee80211_mgd_auth_data *auth_data;
3256        u16 auth_alg;
3257        int err;
3258
3259        /* prepare auth data structure */
3260
3261        switch (req->auth_type) {
3262        case NL80211_AUTHTYPE_OPEN_SYSTEM:
3263                auth_alg = WLAN_AUTH_OPEN;
3264                break;
3265        case NL80211_AUTHTYPE_SHARED_KEY:
3266                if (IS_ERR(local->wep_tx_tfm))
3267                        return -EOPNOTSUPP;
3268                auth_alg = WLAN_AUTH_SHARED_KEY;
3269                break;
3270        case NL80211_AUTHTYPE_FT:
3271                auth_alg = WLAN_AUTH_FT;
3272                break;
3273        case NL80211_AUTHTYPE_NETWORK_EAP:
3274                auth_alg = WLAN_AUTH_LEAP;
3275                break;
3276        default:
3277                return -EOPNOTSUPP;
3278        }
3279
3280        auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3281        if (!auth_data)
3282                return -ENOMEM;
3283
3284        auth_data->bss = req->bss;
3285
3286        if (req->ie && req->ie_len) {
3287                memcpy(auth_data->ie, req->ie, req->ie_len);
3288                auth_data->ie_len = req->ie_len;
3289        }
3290
3291        if (req->key && req->key_len) {
3292                auth_data->key_len = req->key_len;
3293                auth_data->key_idx = req->key_idx;
3294                memcpy(auth_data->key, req->key, req->key_len);
3295        }
3296
3297        auth_data->algorithm = auth_alg;
3298
3299        /* try to authenticate/probe */
3300
3301        mutex_lock(&ifmgd->mtx);
3302
3303        if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3304            ifmgd->assoc_data) {
3305                err = -EBUSY;
3306                goto err_free;
3307        }
3308
3309        if (ifmgd->auth_data)
3310                ieee80211_destroy_auth_data(sdata, false);
3311
3312        /* prep auth_data so we don't go into idle on disassoc */
3313        ifmgd->auth_data = auth_data;
3314
3315        if (ifmgd->associated)
3316                ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3317
3318        sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3319
3320        err = ieee80211_prep_connection(sdata, req->bss, false);
3321        if (err)
3322                goto err_clear;
3323
3324        err = ieee80211_probe_auth(sdata);
3325        if (err) {
3326                sta_info_destroy_addr(sdata, req->bss->bssid);
3327                goto err_clear;
3328        }
3329
3330        /* hold our own reference */
3331        cfg80211_ref_bss(auth_data->bss);
3332        err = 0;
3333        goto out_unlock;
3334
3335 err_clear:
3336        memset(ifmgd->bssid, 0, ETH_ALEN);
3337        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3338        ifmgd->auth_data = NULL;
3339 err_free:
3340        kfree(auth_data);
3341 out_unlock:
3342        mutex_unlock(&ifmgd->mtx);
3343
3344        return err;
3345}
3346
3347int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3348                        struct cfg80211_assoc_request *req)
3349{
3350        struct ieee80211_local *local = sdata->local;
3351        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3352        struct ieee80211_bss *bss = (void *)req->bss->priv;
3353        struct ieee80211_mgd_assoc_data *assoc_data;
3354        struct ieee80211_supported_band *sband;
3355        const u8 *ssidie, *ht_ie;
3356        int i, err;
3357
3358        ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3359        if (!ssidie)
3360                return -EINVAL;
3361
3362        assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3363        if (!assoc_data)
3364                return -ENOMEM;
3365
3366        mutex_lock(&ifmgd->mtx);
3367
3368        if (ifmgd->associated)
3369                ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3370
3371        if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3372                err = -EBUSY;
3373                goto err_free;
3374        }
3375
3376        if (ifmgd->assoc_data) {
3377                err = -EBUSY;
3378                goto err_free;
3379        }
3380
3381        if (ifmgd->auth_data) {
3382                bool match;
3383
3384                /* keep sta info, bssid if matching */
3385                match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3386                ieee80211_destroy_auth_data(sdata, match);
3387        }
3388
3389        /* prepare assoc data */
3390        
3391        /*
3392         * keep only the 40 MHz disable bit set as it might have
3393         * been set during authentication already, all other bits
3394         * should be reset for a new connection
3395         */
3396        ifmgd->flags &= IEEE80211_STA_DISABLE_40MHZ;
3397
3398        ifmgd->beacon_crc_valid = false;
3399
3400        /*
3401         * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3402         * We still associate in non-HT mode (11a/b/g) if any one of these
3403         * ciphers is configured as pairwise.
3404         * We can set this to true for non-11n hardware, that'll be checked
3405         * separately along with the peer capabilities.
3406         */
3407        for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3408                if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3409                    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3410                    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3411                        ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3412                        ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3413                        netdev_info(sdata->dev,
3414                                    "disabling HT/VHT due to WEP/TKIP use\n");
3415                }
3416        }
3417
3418        if (req->flags & ASSOC_REQ_DISABLE_HT) {
3419                ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3420                ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3421        }
3422
3423        /* Also disable HT if we don't support it or the AP doesn't use WMM */
3424        sband = local->hw.wiphy->bands[req->bss->channel->band];
3425        if (!sband->ht_cap.ht_supported ||
3426            local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3427                ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3428                if (!bss->wmm_used)
3429                        netdev_info(sdata->dev,
3430                                    "disabling HT as WMM/QoS is not supported by the AP\n");
3431        }
3432
3433        /* disable VHT if we don't support it or the AP doesn't use WMM */
3434        if (!sband->vht_cap.vht_supported ||
3435            local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3436                ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3437                if (!bss->wmm_used)
3438                        netdev_info(sdata->dev,
3439                                    "disabling VHT as WMM/QoS is not supported by the AP\n");
3440        }
3441
3442        memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3443        memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3444               sizeof(ifmgd->ht_capa_mask));
3445
3446        if (req->ie && req->ie_len) {
3447                memcpy(assoc_data->ie, req->ie, req->ie_len);
3448                assoc_data->ie_len = req->ie_len;
3449        }
3450
3451        assoc_data->bss = req->bss;
3452
3453        if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3454                if (ifmgd->powersave)
3455                        ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3456                else
3457                        ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3458        } else
3459                ifmgd->ap_smps = ifmgd->req_smps;
3460
3461        assoc_data->capability = req->bss->capability;
3462        assoc_data->wmm = bss->wmm_used &&
3463                          (local->hw.queues >= IEEE80211_NUM_ACS);
3464        assoc_data->supp_rates = bss->supp_rates;
3465        assoc_data->supp_rates_len = bss->supp_rates_len;
3466
3467        ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3468        if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3469                assoc_data->ap_ht_param =
3470                        ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3471        else
3472                ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3473
3474        if (bss->wmm_used && bss->uapsd_supported &&
3475            (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3476                assoc_data->uapsd = true;
3477                ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3478        } else {
3479                assoc_data->uapsd = false;
3480                ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3481        }
3482
3483        memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3484        assoc_data->ssid_len = ssidie[1];
3485
3486        if (req->prev_bssid)
3487                memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3488
3489        if (req->use_mfp) {
3490                ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3491                ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3492        } else {
3493                ifmgd->mfp = IEEE80211_MFP_DISABLED;
3494                ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3495        }
3496
3497        if (req->crypto.control_port)
3498                ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3499        else
3500                ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3501
3502        sdata->control_port_protocol = req->crypto.control_port_ethertype;
3503        sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3504
3505        /* kick off associate process */
3506
3507        ifmgd->assoc_data = assoc_data;
3508
3509        err = ieee80211_prep_connection(sdata, req->bss, true);
3510        if (err)
3511                goto err_clear;
3512
3513        if (!bss->dtim_period &&
3514            sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3515                /*
3516                 * Wait up to one beacon interval ...
3517                 * should this be more if we miss one?
3518                 */
3519                sdata_info(sdata, "waiting for beacon from %pM\n",
3520                           ifmgd->bssid);
3521                assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3522        } else {
3523                assoc_data->have_beacon = true;
3524                assoc_data->sent_assoc = false;
3525                assoc_data->timeout = jiffies;
3526        }
3527        run_again(ifmgd, assoc_data->timeout);
3528
3529        if (bss->corrupt_data) {
3530                char *corrupt_type = "data";
3531                if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3532                        if (bss->corrupt_data &
3533                                        IEEE80211_BSS_CORRUPT_PROBE_RESP)
3534                                corrupt_type = "beacon and probe response";
3535                        else
3536                                corrupt_type = "beacon";
3537                } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3538                        corrupt_type = "probe response";
3539                sdata_info(sdata, "associating with AP with corrupt %s\n",
3540                           corrupt_type);
3541        }
3542
3543        err = 0;
3544        goto out;
3545 err_clear:
3546        memset(ifmgd->bssid, 0, ETH_ALEN);
3547        ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3548        ifmgd->assoc_data = NULL;
3549 err_free:
3550        kfree(assoc_data);
3551 out:
3552        mutex_unlock(&ifmgd->mtx);
3553
3554        return err;
3555}
3556
3557int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3558                         struct cfg80211_deauth_request *req)
3559{
3560        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3561        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3562        bool tx = !req->local_state_change;
3563
3564        mutex_lock(&ifmgd->mtx);
3565
3566        if (ifmgd->auth_data) {
3567                ieee80211_destroy_auth_data(sdata, false);
3568                mutex_unlock(&ifmgd->mtx);
3569                return 0;
3570        }
3571
3572        sdata_info(sdata,
3573                   "deauthenticating from %pM by local choice (reason=%d)\n",
3574                   req->bssid, req->reason_code);
3575
3576        if (ifmgd->associated &&
3577            ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3578                ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3579                                       req->reason_code, tx, frame_buf);
3580        } else {
3581                drv_mgd_prepare_tx(sdata->local, sdata);
3582                ieee80211_send_deauth_disassoc(sdata, req->bssid,
3583                                               IEEE80211_STYPE_DEAUTH,
3584                                               req->reason_code, tx,
3585                                               frame_buf);
3586        }
3587
3588        mutex_unlock(&ifmgd->mtx);
3589
3590        __cfg80211_send_deauth(sdata->dev, frame_buf,
3591                               IEEE80211_DEAUTH_FRAME_LEN);
3592
3593        mutex_lock(&sdata->local->mtx);
3594        ieee80211_recalc_idle(sdata->local);
3595        mutex_unlock(&sdata->local->mtx);
3596
3597        return 0;
3598}
3599
3600int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3601                           struct cfg80211_disassoc_request *req)
3602{
3603        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3604        u8 bssid[ETH_ALEN];
3605        u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3606
3607        mutex_lock(&ifmgd->mtx);
3608
3609        /*
3610         * cfg80211 should catch this ... but it's racy since
3611         * we can receive a disassoc frame, process it, hand it
3612         * to cfg80211 while that's in a locked section already
3613         * trying to tell us that the user wants to disconnect.
3614         */
3615        if (ifmgd->associated != req->bss) {
3616                mutex_unlock(&ifmgd->mtx);
3617                return -ENOLINK;
3618        }
3619
3620        sdata_info(sdata,
3621                   "disassociating from %pM by local choice (reason=%d)\n",
3622                   req->bss->bssid, req->reason_code);
3623
3624        memcpy(bssid, req->bss->bssid, ETH_ALEN);
3625        ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3626                               req->reason_code, !req->local_state_change,
3627                               frame_buf);
3628        mutex_unlock(&ifmgd->mtx);
3629
3630        __cfg80211_send_disassoc(sdata->dev, frame_buf,
3631                                 IEEE80211_DEAUTH_FRAME_LEN);
3632
3633        mutex_lock(&sdata->local->mtx);
3634        ieee80211_recalc_idle(sdata->local);
3635        mutex_unlock(&sdata->local->mtx);
3636
3637        return 0;
3638}
3639
3640void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3641{
3642        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3643
3644        mutex_lock(&ifmgd->mtx);
3645        if (ifmgd->assoc_data)
3646                ieee80211_destroy_assoc_data(sdata, false);
3647        if (ifmgd->auth_data)
3648                ieee80211_destroy_auth_data(sdata, false);
3649        del_timer_sync(&ifmgd->timer);
3650        mutex_unlock(&ifmgd->mtx);
3651}
3652
3653void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3654                               enum nl80211_cqm_rssi_threshold_event rssi_event,
3655                               gfp_t gfp)
3656{
3657        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3658
3659        trace_api_cqm_rssi_notify(sdata, rssi_event);
3660
3661        cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3662}
3663EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
3664
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