net/mac80211/mlme.c

   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
  39 static int max_nullfunc_tries = 2;
  40 module_param(max_nullfunc_tries, int, 0644);
  41 MODULE_PARM_DESC(max_nullfunc_tries,
  42                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  43
  44 static int max_probe_tries = 5;
  45 module_param(max_probe_tries, int, 0644);
  46 MODULE_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  */
  69 static int probe_wait_ms = 500;
  70 module_param(probe_wait_ms, int, 0644);
  71 MODULE_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  */
  97 enum 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 */
 118 static 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  */
 133 static 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
 142 void 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
 154 void 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
 170 static int ecw2cw(int ecw)
 171 {
 172         return (1 << ecw) - 1;
 173 }
 174
 175 static 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 ieee80211_chanctx_conf *chanctx_conf;
 182         struct ieee80211_channel *chan;
 183         struct sta_info *sta;
 184         u32 changed = 0;
 185         u16 ht_opmode;
 186         bool disable_40 = false;
 187
 188         rcu_read_lock();
 189         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 190         if (WARN_ON(!chanctx_conf)) {
 191                 rcu_read_unlock();
 192                 return 0;
 193         }
 194         chan = chanctx_conf->def.chan;
 195         rcu_read_unlock();
 196         sband = local->hw.wiphy->bands[chan->band];
 197
 198         switch (sdata->vif.bss_conf.chandef.width) {
 199         case NL80211_CHAN_WIDTH_40:
 200                 if (sdata->vif.bss_conf.chandef.chan->center_freq >
 201                                 sdata->vif.bss_conf.chandef.center_freq1 &&
 202                     chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
 203                         disable_40 = true;
 204                 if (sdata->vif.bss_conf.chandef.chan->center_freq <
 205                                 sdata->vif.bss_conf.chandef.center_freq1 &&
 206                     chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
 207                         disable_40 = true;
 208                 break;
 209         default:
 210                 break;
 211         }
 212
 213         /* This can change during the lifetime of the BSS */
 214         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 215                 disable_40 = true;
 216
 217         mutex_lock(&local->sta_mtx);
 218         sta = sta_info_get(sdata, bssid);
 219
 220         WARN_ON_ONCE(!sta);
 221
 222         if (sta && !sta->supports_40mhz)
 223                 disable_40 = true;
 224
 225         if (sta && (!reconfig ||
 226                     (disable_40 != !(sta->sta.ht_cap.cap &
 227                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 228
 229                 if (disable_40)
 230                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 231                 else
 232                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 233
 234                 rate_control_rate_update(local, sband, sta,
 235                                          IEEE80211_RC_BW_CHANGED);
 236         }
 237         mutex_unlock(&local->sta_mtx);
 238
 239         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 240
 241         /* if bss configuration changed store the new one */
 242         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 243                 changed |= BSS_CHANGED_HT;
 244                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 245         }
 246
 247         return changed;
 248 }
 249
 250 /* frame sending functions */
 251
 252 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 253                                       struct ieee80211_supported_band *sband,
 254                                       u32 *rates)
 255 {
 256         int i, j, count;
 257         *rates = 0;
 258         count = 0;
 259         for (i = 0; i < supp_rates_len; i++) {
 260                 int rate = (supp_rates[i] & 0x7F) * 5;
 261
 262                 for (j = 0; j < sband->n_bitrates; j++)
 263                         if (sband->bitrates[j].bitrate == rate) {
 264                                 *rates |= BIT(j);
 265                                 count++;
 266                                 break;
 267                         }
 268         }
 269
 270         return count;
 271 }
 272
 273 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 274                                 struct sk_buff *skb, u8 ap_ht_param,
 275                                 struct ieee80211_supported_band *sband,
 276                                 struct ieee80211_channel *channel,
 277                                 enum ieee80211_smps_mode smps)
 278 {
 279         u8 *pos;
 280         u32 flags = channel->flags;
 281         u16 cap;
 282         struct ieee80211_sta_ht_cap ht_cap;
 283
 284         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 285
 286         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 287         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 288
 289         /* determine capability flags */
 290         cap = ht_cap.cap;
 291
 292         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 293         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 294                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 295                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 296                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 297                 }
 298                 break;
 299         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 300                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 301                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 302                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 303                 }
 304                 break;
 305         }
 306
 307         /*
 308          * If 40 MHz was disabled associate as though we weren't
 309          * capable of 40 MHz -- some broken APs will never fall
 310          * back to trying to transmit in 20 MHz.
 311          */
 312         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 313                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 314                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 315         }
 316
 317         /* set SM PS mode properly */
 318         cap &= ~IEEE80211_HT_CAP_SM_PS;
 319         switch (smps) {
 320         case IEEE80211_SMPS_AUTOMATIC:
 321         case IEEE80211_SMPS_NUM_MODES:
 322                 WARN_ON(1);
 323         case IEEE80211_SMPS_OFF:
 324                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 325                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 326                 break;
 327         case IEEE80211_SMPS_STATIC:
 328                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 329                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 330                 break;
 331         case IEEE80211_SMPS_DYNAMIC:
 332                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 333                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 334                 break;
 335         }
 336
 337         /* reserve and fill IE */
 338         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 339         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 340 }
 341
 342 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 343                                  struct sk_buff *skb,
 344                                  struct ieee80211_supported_band *sband,
 345                                  struct ieee80211_vht_cap *ap_vht_cap)
 346 {
 347         u8 *pos;
 348         u32 cap;
 349         struct ieee80211_sta_vht_cap vht_cap;
 350         int i;
 351
 352         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 353
 354         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 355
 356         /* determine capability flags */
 357         cap = vht_cap.cap;
 358
 359         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 360                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 361                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 362         }
 363
 364         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 365                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 366                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 367         }
 368
 369         /*
 370          * Some APs apparently get confused if our capabilities are better
 371          * than theirs, so restrict what we advertise in the assoc request.
 372          */
 373         if (!(ap_vht_cap->vht_cap_info &
 374                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 375                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 376
 377         if (!(ap_vht_cap->vht_cap_info &
 378                         cpu_to_le32(IEEE80211_VHT_CAP_TXSTBC)))
 379                 cap &= ~(IEEE80211_VHT_CAP_RXSTBC_1 |
 380                          IEEE80211_VHT_CAP_RXSTBC_3 |
 381                          IEEE80211_VHT_CAP_RXSTBC_4);
 382
 383         for (i = 0; i < 8; i++) {
 384                 int shift = i * 2;
 385                 u16 mask = IEEE80211_VHT_MCS_NOT_SUPPORTED << shift;
 386                 u16 ap_mcs, our_mcs;
 387
 388                 ap_mcs = (le16_to_cpu(ap_vht_cap->supp_mcs.tx_mcs_map) &
 389                                                                 mask) >> shift;
 390                 our_mcs = (le16_to_cpu(vht_cap.vht_mcs.rx_mcs_map) &
 391                                                                 mask) >> shift;
 392
 393                 switch (ap_mcs) {
 394                 default:
 395                         if (our_mcs <= ap_mcs)
 396                                 break;
 397                         /* fall through */
 398                 case IEEE80211_VHT_MCS_NOT_SUPPORTED:
 399                         vht_cap.vht_mcs.rx_mcs_map &= cpu_to_le16(~mask);
 400                         vht_cap.vht_mcs.rx_mcs_map |=
 401                                 cpu_to_le16(ap_mcs << shift);
 402                 }
 403         }
 404
 405         /* reserve and fill IE */
 406         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 407         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 408 }
 409
 410 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 411 {
 412         struct ieee80211_local *local = sdata->local;
 413         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 414         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 415         struct sk_buff *skb;
 416         struct ieee80211_mgmt *mgmt;
 417         u8 *pos, qos_info;
 418         size_t offset = 0, noffset;
 419         int i, count, rates_len, supp_rates_len;
 420         u16 capab;
 421         struct ieee80211_supported_band *sband;
 422         struct ieee80211_chanctx_conf *chanctx_conf;
 423         struct ieee80211_channel *chan;
 424         u32 rates = 0;
 425
 426         lockdep_assert_held(&ifmgd->mtx);
 427
 428         rcu_read_lock();
 429         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 430         if (WARN_ON(!chanctx_conf)) {
 431                 rcu_read_unlock();
 432                 return;
 433         }
 434         chan = chanctx_conf->def.chan;
 435         rcu_read_unlock();
 436         sband = local->hw.wiphy->bands[chan->band];
 437
 438         if (assoc_data->supp_rates_len) {
 439                 /*
 440                  * Get all rates supported by the device and the AP as
 441                  * some APs don't like getting a superset of their rates
 442                  * in the association request (e.g. D-Link DAP 1353 in
 443                  * b-only mode)...
 444                  */
 445                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 446                                                        assoc_data->supp_rates_len,
 447                                                        sband, &rates);
 448         } else {
 449                 /*
 450                  * In case AP not provide any supported rates information
 451                  * before association, we send information element(s) with
 452                  * all rates that we support.
 453                  */
 454                 rates = ~0;
 455                 rates_len = sband->n_bitrates;
 456         }
 457
 458         skb = alloc_skb(local->hw.extra_tx_headroom +
 459                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 460                         2 + assoc_data->ssid_len + /* SSID */
 461                         4 + rates_len + /* (extended) rates */
 462                         4 + /* power capability */
 463                         2 + 2 * sband->n_channels + /* supported channels */
 464                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 465                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 466                         assoc_data->ie_len + /* extra IEs */
 467                         9, /* WMM */
 468                         GFP_KERNEL);
 469         if (!skb)
 470                 return;
 471
 472         skb_reserve(skb, local->hw.extra_tx_headroom);
 473
 474         capab = WLAN_CAPABILITY_ESS;
 475
 476         if (sband->band == IEEE80211_BAND_2GHZ) {
 477                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 478                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 479                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 480                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 481         }
 482
 483         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 484                 capab |= WLAN_CAPABILITY_PRIVACY;
 485
 486         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 487             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 488                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 489
 490         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 491         memset(mgmt, 0, 24);
 492         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 493         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 494         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 495
 496         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 497                 skb_put(skb, 10);
 498                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 499                                                   IEEE80211_STYPE_REASSOC_REQ);
 500                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 501                 mgmt->u.reassoc_req.listen_interval =
 502                                 cpu_to_le16(local->hw.conf.listen_interval);
 503                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 504                        ETH_ALEN);
 505         } else {
 506                 skb_put(skb, 4);
 507                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 508                                                   IEEE80211_STYPE_ASSOC_REQ);
 509                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 510                 mgmt->u.assoc_req.listen_interval =
 511                                 cpu_to_le16(local->hw.conf.listen_interval);
 512         }
 513
 514         /* SSID */
 515         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 516         *pos++ = WLAN_EID_SSID;
 517         *pos++ = assoc_data->ssid_len;
 518         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 519
 520         /* add all rates which were marked to be used above */
 521         supp_rates_len = rates_len;
 522         if (supp_rates_len > 8)
 523                 supp_rates_len = 8;
 524
 525         pos = skb_put(skb, supp_rates_len + 2);
 526         *pos++ = WLAN_EID_SUPP_RATES;
 527         *pos++ = supp_rates_len;
 528
 529         count = 0;
 530         for (i = 0; i < sband->n_bitrates; i++) {
 531                 if (BIT(i) & rates) {
 532                         int rate = sband->bitrates[i].bitrate;
 533                         *pos++ = (u8) (rate / 5);
 534                         if (++count == 8)
 535                                 break;
 536                 }
 537         }
 538
 539         if (rates_len > count) {
 540                 pos = skb_put(skb, rates_len - count + 2);
 541                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 542                 *pos++ = rates_len - count;
 543
 544                 for (i++; i < sband->n_bitrates; i++) {
 545                         if (BIT(i) & rates) {
 546                                 int rate = sband->bitrates[i].bitrate;
 547                                 *pos++ = (u8) (rate / 5);
 548                         }
 549                 }
 550         }
 551
 552         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 553                 /* 1. power capabilities */
 554                 pos = skb_put(skb, 4);
 555                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 556                 *pos++ = 2;
 557                 *pos++ = 0; /* min tx power */
 558                 *pos++ = chan->max_power; /* max tx power */
 559
 560                 /* 2. supported channels */
 561                 /* TODO: get this in reg domain format */
 562                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 563                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 564                 *pos++ = 2 * sband->n_channels;
 565                 for (i = 0; i < sband->n_channels; i++) {
 566                         *pos++ = ieee80211_frequency_to_channel(
 567                                         sband->channels[i].center_freq);
 568                         *pos++ = 1; /* one channel in the subband*/
 569                 }
 570         }
 571
 572         /* if present, add any custom IEs that go before HT */
 573         if (assoc_data->ie_len && assoc_data->ie) {
 574                 static const u8 before_ht[] = {
 575                         WLAN_EID_SSID,
 576                         WLAN_EID_SUPP_RATES,
 577                         WLAN_EID_EXT_SUPP_RATES,
 578                         WLAN_EID_PWR_CAPABILITY,
 579                         WLAN_EID_SUPPORTED_CHANNELS,
 580                         WLAN_EID_RSN,
 581                         WLAN_EID_QOS_CAPA,
 582                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 583                         WLAN_EID_MOBILITY_DOMAIN,
 584                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 585                 };
 586                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 587                                              before_ht, ARRAY_SIZE(before_ht),
 588                                              offset);
 589                 pos = skb_put(skb, noffset - offset);
 590                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 591                 offset = noffset;
 592         }
 593
 594         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 595                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 596                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 597
 598         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 599                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 600                                     sband, chan, sdata->smps_mode);
 601
 602         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 603                 ieee80211_add_vht_ie(sdata, skb, sband,
 604                                      &assoc_data->ap_vht_cap);
 605
 606         /* if present, add any custom non-vendor IEs that go after HT */
 607         if (assoc_data->ie_len && assoc_data->ie) {
 608                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 609                                                     assoc_data->ie_len,
 610                                                     offset);
 611                 pos = skb_put(skb, noffset - offset);
 612                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 613                 offset = noffset;
 614         }
 615
 616         if (assoc_data->wmm) {
 617                 if (assoc_data->uapsd) {
 618                         qos_info = ifmgd->uapsd_queues;
 619                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 620                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 621                 } else {
 622                         qos_info = 0;
 623                 }
 624
 625                 pos = skb_put(skb, 9);
 626                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 627                 *pos++ = 7; /* len */
 628                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 629                 *pos++ = 0x50;
 630                 *pos++ = 0xf2;
 631                 *pos++ = 2; /* WME */
 632                 *pos++ = 0; /* WME info */
 633                 *pos++ = 1; /* WME ver */
 634                 *pos++ = qos_info;
 635         }
 636
 637         /* add any remaining custom (i.e. vendor specific here) IEs */
 638         if (assoc_data->ie_len && assoc_data->ie) {
 639                 noffset = assoc_data->ie_len;
 640                 pos = skb_put(skb, noffset - offset);
 641                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 642         }
 643
 644         drv_mgd_prepare_tx(local, sdata);
 645
 646         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 647         ieee80211_tx_skb(sdata, skb);
 648 }
 649
 650 void ieee80211_send_pspoll(struct ieee80211_local *local,
 651                            struct ieee80211_sub_if_data *sdata)
 652 {
 653         struct ieee80211_pspoll *pspoll;
 654         struct sk_buff *skb;
 655
 656         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 657         if (!skb)
 658                 return;
 659
 660         pspoll = (struct ieee80211_pspoll *) skb->data;
 661         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 662
 663         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 664         ieee80211_tx_skb(sdata, skb);
 665 }
 666
 667 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 668                              struct ieee80211_sub_if_data *sdata,
 669                              int powersave)
 670 {
 671         struct sk_buff *skb;
 672         struct ieee80211_hdr_3addr *nullfunc;
 673         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 674
 675         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 676         if (!skb)
 677                 return;
 678
 679         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 680         if (powersave)
 681                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 682
 683         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 684         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 685                             IEEE80211_STA_CONNECTION_POLL))
 686                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 687
 688         ieee80211_tx_skb(sdata, skb);
 689 }
 690
 691 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 692                                           struct ieee80211_sub_if_data *sdata)
 693 {
 694         struct sk_buff *skb;
 695         struct ieee80211_hdr *nullfunc;
 696         __le16 fc;
 697
 698         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 699                 return;
 700
 701         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 702         if (!skb)
 703                 return;
 704
 705         skb_reserve(skb, local->hw.extra_tx_headroom);
 706
 707         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 708         memset(nullfunc, 0, 30);
 709         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 710                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 711         nullfunc->frame_control = fc;
 712         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 713         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 714         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 715         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 716
 717         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 718         ieee80211_tx_skb(sdata, skb);
 719 }
 720
 721 /* spectrum management related things */
 722 static void ieee80211_chswitch_work(struct work_struct *work)
 723 {
 724         struct ieee80211_sub_if_data *sdata =
 725                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 726         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 727
 728         if (!ieee80211_sdata_running(sdata))
 729                 return;
 730
 731         mutex_lock(&ifmgd->mtx);
 732         if (!ifmgd->associated)
 733                 goto out;
 734
 735         sdata->local->_oper_channel = sdata->local->csa_channel;
 736         if (!sdata->local->ops->channel_switch) {
 737                 /* call "hw_config" only if doing sw channel switch */
 738                 ieee80211_hw_config(sdata->local,
 739                         IEEE80211_CONF_CHANGE_CHANNEL);
 740         } else {
 741                 /* update the device channel directly */
 742                 sdata->local->hw.conf.channel = sdata->local->_oper_channel;
 743         }
 744
 745         /* XXX: shouldn't really modify cfg80211-owned data! */
 746         ifmgd->associated->channel = sdata->local->_oper_channel;
 747
 748         /* XXX: wait for a beacon first? */
 749         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 750                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 751  out:
 752         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 753         mutex_unlock(&ifmgd->mtx);
 754 }
 755
 756 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 757 {
 758         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 759         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 760
 761         trace_api_chswitch_done(sdata, success);
 762         if (!success) {
 763                 sdata_info(sdata,
 764                            "driver channel switch failed, disconnecting\n");
 765                 ieee80211_queue_work(&sdata->local->hw,
 766                                      &ifmgd->csa_connection_drop_work);
 767         } else {
 768                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 769         }
 770 }
 771 EXPORT_SYMBOL(ieee80211_chswitch_done);
 772
 773 static void ieee80211_chswitch_timer(unsigned long data)
 774 {
 775         struct ieee80211_sub_if_data *sdata =
 776                 (struct ieee80211_sub_if_data *) data;
 777         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 778
 779         if (sdata->local->quiescing) {
 780                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 781                 return;
 782         }
 783
 784         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 785 }
 786
 787 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 788                                       struct ieee80211_channel_sw_ie *sw_elem,
 789                                       struct ieee80211_bss *bss,
 790                                       u64 timestamp)
 791 {
 792         struct cfg80211_bss *cbss =
 793                 container_of((void *)bss, struct cfg80211_bss, priv);
 794         struct ieee80211_channel *new_ch;
 795         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 796         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 797                                                       cbss->channel->band);
 798         struct ieee80211_chanctx *chanctx;
 799
 800         ASSERT_MGD_MTX(ifmgd);
 801
 802         if (!ifmgd->associated)
 803                 return;
 804
 805         if (sdata->local->scanning)
 806                 return;
 807
 808         /* Disregard subsequent beacons if we are already running a timer
 809            processing a CSA */
 810
 811         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 812                 return;
 813
 814         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 815         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
 816                 sdata_info(sdata,
 817                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
 818                            ifmgd->associated->bssid, new_freq);
 819                 ieee80211_queue_work(&sdata->local->hw,
 820                                      &ifmgd->csa_connection_drop_work);
 821                 return;
 822         }
 823
 824         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 825
 826         if (sdata->local->use_chanctx) {
 827                 sdata_info(sdata,
 828                            "not handling channel switch with channel contexts\n");
 829                 ieee80211_queue_work(&sdata->local->hw,
 830                                      &ifmgd->csa_connection_drop_work);
 831                 return;
 832         }
 833
 834         mutex_lock(&sdata->local->chanctx_mtx);
 835         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
 836                 mutex_unlock(&sdata->local->chanctx_mtx);
 837                 return;
 838         }
 839         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
 840                                struct ieee80211_chanctx, conf);
 841         if (chanctx->refcount > 1) {
 842                 sdata_info(sdata,
 843                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
 844                 ieee80211_queue_work(&sdata->local->hw,
 845                                      &ifmgd->csa_connection_drop_work);
 846                 mutex_unlock(&sdata->local->chanctx_mtx);
 847                 return;
 848         }
 849         mutex_unlock(&sdata->local->chanctx_mtx);
 850
 851         sdata->local->csa_channel = new_ch;
 852
 853         if (sw_elem->mode)
 854                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 855                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 856
 857         if (sdata->local->ops->channel_switch) {
 858                 /* use driver's channel switch callback */
 859                 struct ieee80211_channel_switch ch_switch = {
 860                         .timestamp = timestamp,
 861                         .block_tx = sw_elem->mode,
 862                         .channel = new_ch,
 863                         .count = sw_elem->count,
 864                 };
 865
 866                 drv_channel_switch(sdata->local, &ch_switch);
 867                 return;
 868         }
 869
 870         /* channel switch handled in software */
 871         if (sw_elem->count <= 1)
 872                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 873         else
 874                 mod_timer(&ifmgd->chswitch_timer,
 875                           TU_TO_EXP_TIME(sw_elem->count *
 876                                          cbss->beacon_interval));
 877 }
 878
 879 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 880                                        struct ieee80211_channel *channel,
 881                                        const u8 *country_ie, u8 country_ie_len,
 882                                        const u8 *pwr_constr_elem)
 883 {
 884         struct ieee80211_country_ie_triplet *triplet;
 885         int chan = ieee80211_frequency_to_channel(channel->center_freq);
 886         int i, chan_pwr, chan_increment, new_ap_level;
 887         bool have_chan_pwr = false;
 888
 889         /* Invalid IE */
 890         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
 891                 return 0;
 892
 893         triplet = (void *)(country_ie + 3);
 894         country_ie_len -= 3;
 895
 896         switch (channel->band) {
 897         default:
 898                 WARN_ON_ONCE(1);
 899                 /* fall through */
 900         case IEEE80211_BAND_2GHZ:
 901         case IEEE80211_BAND_60GHZ:
 902                 chan_increment = 1;
 903                 break;
 904         case IEEE80211_BAND_5GHZ:
 905                 chan_increment = 4;
 906                 break;
 907         }
 908
 909         /* find channel */
 910         while (country_ie_len >= 3) {
 911                 u8 first_channel = triplet->chans.first_channel;
 912
 913                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
 914                         goto next;
 915
 916                 for (i = 0; i < triplet->chans.num_channels; i++) {
 917                         if (first_channel + i * chan_increment == chan) {
 918                                 have_chan_pwr = true;
 919                                 chan_pwr = triplet->chans.max_power;
 920                                 break;
 921                         }
 922                 }
 923                 if (have_chan_pwr)
 924                         break;
 925
 926  next:
 927                 triplet++;
 928                 country_ie_len -= 3;
 929         }
 930
 931         if (!have_chan_pwr)
 932                 return 0;
 933
 934         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
 935
 936         if (sdata->ap_power_level == new_ap_level)
 937                 return 0;
 938
 939         sdata_info(sdata,
 940                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
 941                    new_ap_level, chan_pwr, *pwr_constr_elem,
 942                    sdata->u.mgd.bssid);
 943         sdata->ap_power_level = new_ap_level;
 944         if (__ieee80211_recalc_txpower(sdata))
 945                 return BSS_CHANGED_TXPOWER;
 946         return 0;
 947 }
 948
 949 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 950 {
 951         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 952         struct ieee80211_local *local = sdata->local;
 953         struct ieee80211_conf *conf = &local->hw.conf;
 954
 955         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 956                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 957                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 958
 959         local->disable_dynamic_ps = false;
 960         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 961 }
 962 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 963
 964 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 965 {
 966         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 967         struct ieee80211_local *local = sdata->local;
 968         struct ieee80211_conf *conf = &local->hw.conf;
 969
 970         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 971                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 972                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 973
 974         local->disable_dynamic_ps = true;
 975         conf->dynamic_ps_timeout = 0;
 976         del_timer_sync(&local->dynamic_ps_timer);
 977         ieee80211_queue_work(&local->hw,
 978                              &local->dynamic_ps_enable_work);
 979 }
 980 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 981
 982 /* powersave */
 983 static void ieee80211_enable_ps(struct ieee80211_local *local,
 984                                 struct ieee80211_sub_if_data *sdata)
 985 {
 986         struct ieee80211_conf *conf = &local->hw.conf;
 987
 988         /*
 989          * If we are scanning right now then the parameters will
 990          * take effect when scan finishes.
 991          */
 992         if (local->scanning)
 993                 return;
 994
 995         if (conf->dynamic_ps_timeout > 0 &&
 996             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 997                 mod_timer(&local->dynamic_ps_timer, jiffies +
 998                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 999         } else {
1000                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1001                         ieee80211_send_nullfunc(local, sdata, 1);
1002
1003                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1004                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1005                         return;
1006
1007                 conf->flags |= IEEE80211_CONF_PS;
1008                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1009         }
1010 }
1011
1012 static void ieee80211_change_ps(struct ieee80211_local *local)
1013 {
1014         struct ieee80211_conf *conf = &local->hw.conf;
1015
1016         if (local->ps_sdata) {
1017                 ieee80211_enable_ps(local, local->ps_sdata);
1018         } else if (conf->flags & IEEE80211_CONF_PS) {
1019                 conf->flags &= ~IEEE80211_CONF_PS;
1020                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1021                 del_timer_sync(&local->dynamic_ps_timer);
1022                 cancel_work_sync(&local->dynamic_ps_enable_work);
1023         }
1024 }
1025
1026 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1027 {
1028         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1029         struct sta_info *sta = NULL;
1030         bool authorized = false;
1031
1032         if (!mgd->powersave)
1033                 return false;
1034
1035         if (mgd->broken_ap)
1036                 return false;
1037
1038         if (!mgd->associated)
1039                 return false;
1040
1041         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
1042                           IEEE80211_STA_CONNECTION_POLL))
1043                 return false;
1044
1045         rcu_read_lock();
1046         sta = sta_info_get(sdata, mgd->bssid);
1047         if (sta)
1048                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1049         rcu_read_unlock();
1050
1051         return authorized;
1052 }
1053
1054 /* need to hold RTNL or interface lock */
1055 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1056 {
1057         struct ieee80211_sub_if_data *sdata, *found = NULL;
1058         int count = 0;
1059         int timeout;
1060
1061         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1062                 local->ps_sdata = NULL;
1063                 return;
1064         }
1065
1066         list_for_each_entry(sdata, &local->interfaces, list) {
1067                 if (!ieee80211_sdata_running(sdata))
1068                         continue;
1069                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1070                         /* If an AP vif is found, then disable PS
1071                          * by setting the count to zero thereby setting
1072                          * ps_sdata to NULL.
1073                          */
1074                         count = 0;
1075                         break;
1076                 }
1077                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1078                         continue;
1079                 found = sdata;
1080                 count++;
1081         }
1082
1083         if (count == 1 && ieee80211_powersave_allowed(found)) {
1084                 struct ieee80211_conf *conf = &local->hw.conf;
1085                 s32 beaconint_us;
1086
1087                 if (latency < 0)
1088                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1089
1090                 beaconint_us = ieee80211_tu_to_usec(
1091                                         found->vif.bss_conf.beacon_int);
1092
1093                 timeout = local->dynamic_ps_forced_timeout;
1094                 if (timeout < 0) {
1095                         /*
1096                          * Go to full PSM if the user configures a very low
1097                          * latency requirement.
1098                          * The 2000 second value is there for compatibility
1099                          * until the PM_QOS_NETWORK_LATENCY is configured
1100                          * with real values.
1101                          */
1102                         if (latency > (1900 * USEC_PER_MSEC) &&
1103                             latency != (2000 * USEC_PER_SEC))
1104                                 timeout = 0;
1105                         else
1106                                 timeout = 100;
1107                 }
1108                 local->dynamic_ps_user_timeout = timeout;
1109                 if (!local->disable_dynamic_ps)
1110                         conf->dynamic_ps_timeout =
1111                                 local->dynamic_ps_user_timeout;
1112
1113                 if (beaconint_us > latency) {
1114                         local->ps_sdata = NULL;
1115                 } else {
1116                         int maxslp = 1;
1117                         u8 dtimper = found->u.mgd.dtim_period;
1118
1119                         /* If the TIM IE is invalid, pretend the value is 1 */
1120                         if (!dtimper)
1121                                 dtimper = 1;
1122                         else if (dtimper > 1)
1123                                 maxslp = min_t(int, dtimper,
1124                                                     latency / beaconint_us);
1125
1126                         local->hw.conf.max_sleep_period = maxslp;
1127                         local->hw.conf.ps_dtim_period = dtimper;
1128                         local->ps_sdata = found;
1129                 }
1130         } else {
1131                 local->ps_sdata = NULL;
1132         }
1133
1134         ieee80211_change_ps(local);
1135 }
1136
1137 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1138 {
1139         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1140
1141         if (sdata->vif.bss_conf.ps != ps_allowed) {
1142                 sdata->vif.bss_conf.ps = ps_allowed;
1143                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1144         }
1145 }
1146
1147 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1148 {
1149         struct ieee80211_local *local =
1150                 container_of(work, struct ieee80211_local,
1151                              dynamic_ps_disable_work);
1152
1153         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1154                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1155                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1156         }
1157
1158         ieee80211_wake_queues_by_reason(&local->hw,
1159                                         IEEE80211_QUEUE_STOP_REASON_PS);
1160 }
1161
1162 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1163 {
1164         struct ieee80211_local *local =
1165                 container_of(work, struct ieee80211_local,
1166                              dynamic_ps_enable_work);
1167         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1168         struct ieee80211_if_managed *ifmgd;
1169         unsigned long flags;
1170         int q;
1171
1172         /* can only happen when PS was just disabled anyway */
1173         if (!sdata)
1174                 return;
1175
1176         ifmgd = &sdata->u.mgd;
1177
1178         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1179                 return;
1180
1181         if (!local->disable_dynamic_ps &&
1182             local->hw.conf.dynamic_ps_timeout > 0) {
1183                 /* don't enter PS if TX frames are pending */
1184                 if (drv_tx_frames_pending(local)) {
1185                         mod_timer(&local->dynamic_ps_timer, jiffies +
1186                                   msecs_to_jiffies(
1187                                   local->hw.conf.dynamic_ps_timeout));
1188                         return;
1189                 }
1190
1191                 /*
1192                  * transmission can be stopped by others which leads to
1193                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1194                  * is not the actual idle state.
1195                  */
1196                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1197                 for (q = 0; q < local->hw.queues; q++) {
1198                         if (local->queue_stop_reasons[q]) {
1199                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1200                                                        flags);
1201                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1202                                           msecs_to_jiffies(
1203                                           local->hw.conf.dynamic_ps_timeout));
1204                                 return;
1205                         }
1206                 }
1207                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1208         }
1209
1210         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1211             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1212                 netif_tx_stop_all_queues(sdata->dev);
1213
1214                 if (drv_tx_frames_pending(local))
1215                         mod_timer(&local->dynamic_ps_timer, jiffies +
1216                                   msecs_to_jiffies(
1217                                   local->hw.conf.dynamic_ps_timeout));
1218                 else {
1219                         ieee80211_send_nullfunc(local, sdata, 1);
1220                         /* Flush to get the tx status of nullfunc frame */
1221                         drv_flush(local, false);
1222                 }
1223         }
1224
1225         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1226               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1227             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1228                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1229                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1230                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1231         }
1232
1233         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1234                 netif_tx_wake_all_queues(sdata->dev);
1235 }
1236
1237 void ieee80211_dynamic_ps_timer(unsigned long data)
1238 {
1239         struct ieee80211_local *local = (void *) data;
1240
1241         if (local->quiescing || local->suspended)
1242                 return;
1243
1244         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1245 }
1246
1247 /* MLME */
1248 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1249                                      struct ieee80211_sub_if_data *sdata,
1250                                      u8 *wmm_param, size_t wmm_param_len)
1251 {
1252         struct ieee80211_tx_queue_params params;
1253         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1254         size_t left;
1255         int count;
1256         u8 *pos, uapsd_queues = 0;
1257
1258         if (!local->ops->conf_tx)
1259                 return false;
1260
1261         if (local->hw.queues < IEEE80211_NUM_ACS)
1262                 return false;
1263
1264         if (!wmm_param)
1265                 return false;
1266
1267         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1268                 return false;
1269
1270         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1271                 uapsd_queues = ifmgd->uapsd_queues;
1272
1273         count = wmm_param[6] & 0x0f;
1274         if (count == ifmgd->wmm_last_param_set)
1275                 return false;
1276         ifmgd->wmm_last_param_set = count;
1277
1278         pos = wmm_param + 8;
1279         left = wmm_param_len - 8;
1280
1281         memset(&params, 0, sizeof(params));
1282
1283         sdata->wmm_acm = 0;
1284         for (; left >= 4; left -= 4, pos += 4) {
1285                 int aci = (pos[0] >> 5) & 0x03;
1286                 int acm = (pos[0] >> 4) & 0x01;
1287                 bool uapsd = false;
1288                 int queue;
1289
1290                 switch (aci) {
1291                 case 1: /* AC_BK */
1292                         queue = 3;
1293                         if (acm)
1294                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1295                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1296                                 uapsd = true;
1297                         break;
1298                 case 2: /* AC_VI */
1299                         queue = 1;
1300                         if (acm)
1301                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1302                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1303                                 uapsd = true;
1304                         break;
1305                 case 3: /* AC_VO */
1306                         queue = 0;
1307                         if (acm)
1308                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1309                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1310                                 uapsd = true;
1311                         break;
1312                 case 0: /* AC_BE */
1313                 default:
1314                         queue = 2;
1315                         if (acm)
1316                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1317                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1318                                 uapsd = true;
1319                         break;
1320                 }
1321
1322                 params.aifs = pos[0] & 0x0f;
1323                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1324                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1325                 params.txop = get_unaligned_le16(pos + 2);
1326                 params.uapsd = uapsd;
1327
1328                 mlme_dbg(sdata,
1329                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1330                          queue, aci, acm,
1331                          params.aifs, params.cw_min, params.cw_max,
1332                          params.txop, params.uapsd);
1333                 sdata->tx_conf[queue] = params;
1334                 if (drv_conf_tx(local, sdata, queue, &params))
1335                         sdata_err(sdata,
1336                                   "failed to set TX queue parameters for queue %d\n",
1337                                   queue);
1338         }
1339
1340         /* enable WMM or activate new settings */
1341         sdata->vif.bss_conf.qos = true;
1342         return true;
1343 }
1344
1345 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1346 {
1347         lockdep_assert_held(&sdata->local->mtx);
1348
1349         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1350                                 IEEE80211_STA_BEACON_POLL);
1351         ieee80211_run_deferred_scan(sdata->local);
1352 }
1353
1354 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1355 {
1356         mutex_lock(&sdata->local->mtx);
1357         __ieee80211_stop_poll(sdata);
1358         mutex_unlock(&sdata->local->mtx);
1359 }
1360
1361 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1362                                            u16 capab, bool erp_valid, u8 erp)
1363 {
1364         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1365         u32 changed = 0;
1366         bool use_protection;
1367         bool use_short_preamble;
1368         bool use_short_slot;
1369
1370         if (erp_valid) {
1371                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1372                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1373         } else {
1374                 use_protection = false;
1375                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1376         }
1377
1378         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1379         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1380                 use_short_slot = true;
1381
1382         if (use_protection != bss_conf->use_cts_prot) {
1383                 bss_conf->use_cts_prot = use_protection;
1384                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1385         }
1386
1387         if (use_short_preamble != bss_conf->use_short_preamble) {
1388                 bss_conf->use_short_preamble = use_short_preamble;
1389                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1390         }
1391
1392         if (use_short_slot != bss_conf->use_short_slot) {
1393                 bss_conf->use_short_slot = use_short_slot;
1394                 changed |= BSS_CHANGED_ERP_SLOT;
1395         }
1396
1397         return changed;
1398 }
1399
1400 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1401                                      struct cfg80211_bss *cbss,
1402                                      u32 bss_info_changed)
1403 {
1404         struct ieee80211_bss *bss = (void *)cbss->priv;
1405         struct ieee80211_local *local = sdata->local;
1406         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1407
1408         bss_info_changed |= BSS_CHANGED_ASSOC;
1409         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1410                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1411
1412         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1413                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1414
1415         sdata->u.mgd.associated = cbss;
1416         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1417
1418         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1419
1420         if (sdata->vif.p2p) {
1421                 const struct cfg80211_bss_ies *ies;
1422
1423                 rcu_read_lock();
1424                 ies = rcu_dereference(cbss->ies);
1425                 if (ies) {
1426                         u8 noa[2];
1427                         int ret;
1428
1429                         ret = cfg80211_get_p2p_attr(
1430                                         ies->data, ies->len,
1431                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1432                                         noa, sizeof(noa));
1433                         if (ret >= 2) {
1434                                 bss_conf->p2p_oppps = noa[1] & 0x80;
1435                                 bss_conf->p2p_ctwindow = noa[1] & 0x7f;
1436                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1437                                 sdata->u.mgd.p2p_noa_index = noa[0];
1438                         }
1439                 }
1440                 rcu_read_unlock();
1441         }
1442
1443         /* just to be sure */
1444         ieee80211_stop_poll(sdata);
1445
1446         ieee80211_led_assoc(local, 1);
1447
1448         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
1449                 /*
1450                  * If the AP is buggy we may get here with no DTIM period
1451                  * known, so assume it's 1 which is the only safe assumption
1452                  * in that case, although if the TIM IE is broken powersave
1453                  * probably just won't work at all.
1454                  */
1455                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1456         } else {
1457                 bss_conf->dtim_period = 0;
1458         }
1459
1460         bss_conf->assoc = 1;
1461
1462         /* Tell the driver to monitor connection quality (if supported) */
1463         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1464             bss_conf->cqm_rssi_thold)
1465                 bss_info_changed |= BSS_CHANGED_CQM;
1466
1467         /* Enable ARP filtering */
1468         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1469                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1470                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1471         }
1472
1473         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1474
1475         mutex_lock(&local->iflist_mtx);
1476         ieee80211_recalc_ps(local, -1);
1477         mutex_unlock(&local->iflist_mtx);
1478
1479         ieee80211_recalc_smps(sdata);
1480         ieee80211_recalc_ps_vif(sdata);
1481
1482         netif_tx_start_all_queues(sdata->dev);
1483         netif_carrier_on(sdata->dev);
1484 }
1485
1486 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1487                                    u16 stype, u16 reason, bool tx,
1488                                    u8 *frame_buf)
1489 {
1490         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1491         struct ieee80211_local *local = sdata->local;
1492         struct sta_info *sta;
1493         u32 changed = 0;
1494
1495         ASSERT_MGD_MTX(ifmgd);
1496
1497         if (WARN_ON_ONCE(tx && !frame_buf))
1498                 return;
1499
1500         if (WARN_ON(!ifmgd->associated))
1501                 return;
1502
1503         ieee80211_stop_poll(sdata);
1504
1505         ifmgd->associated = NULL;
1506
1507         /*
1508          * we need to commit the associated = NULL change because the
1509          * scan code uses that to determine whether this iface should
1510          * go to/wake up from powersave or not -- and could otherwise
1511          * wake the queues erroneously.
1512          */
1513         smp_mb();
1514
1515         /*
1516          * Thus, we can only afterwards stop the queues -- to account
1517          * for the case where another CPU is finishing a scan at this
1518          * time -- we don't want the scan code to enable queues.
1519          */
1520
1521         netif_tx_stop_all_queues(sdata->dev);
1522         netif_carrier_off(sdata->dev);
1523
1524         mutex_lock(&local->sta_mtx);
1525         sta = sta_info_get(sdata, ifmgd->bssid);
1526         if (sta) {
1527                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1528                 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
1529         }
1530         mutex_unlock(&local->sta_mtx);
1531
1532         /*
1533          * if we want to get out of ps before disassoc (why?) we have
1534          * to do it before sending disassoc, as otherwise the null-packet
1535          * won't be valid.
1536          */
1537         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1538                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1539                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1540         }
1541         local->ps_sdata = NULL;
1542
1543         /* disable per-vif ps */
1544         ieee80211_recalc_ps_vif(sdata);
1545
1546         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1547         if (tx)
1548                 drv_flush(local, false);
1549
1550         /* deauthenticate/disassociate now */
1551         if (tx || frame_buf)
1552                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1553                                                reason, tx, frame_buf);
1554
1555         /* flush out frame */
1556         if (tx)
1557                 drv_flush(local, false);
1558
1559         /* clear bssid only after building the needed mgmt frames */
1560         memset(ifmgd->bssid, 0, ETH_ALEN);
1561
1562         /* remove AP and TDLS peers */
1563         sta_info_flush_defer(sdata);
1564
1565         /* finally reset all BSS / config parameters */
1566         changed |= ieee80211_reset_erp_info(sdata);
1567
1568         ieee80211_led_assoc(local, 0);
1569         changed |= BSS_CHANGED_ASSOC;
1570         sdata->vif.bss_conf.assoc = false;
1571
1572         sdata->vif.bss_conf.p2p_ctwindow = 0;
1573         sdata->vif.bss_conf.p2p_oppps = false;
1574
1575         /* on the next assoc, re-program HT parameters */
1576         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1577         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1578
1579         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1580
1581         del_timer_sync(&local->dynamic_ps_timer);
1582         cancel_work_sync(&local->dynamic_ps_enable_work);
1583
1584         /* Disable ARP filtering */
1585         if (sdata->vif.bss_conf.arp_filter_enabled) {
1586                 sdata->vif.bss_conf.arp_filter_enabled = false;
1587                 changed |= BSS_CHANGED_ARP_FILTER;
1588         }
1589
1590         sdata->vif.bss_conf.qos = false;
1591         changed |= BSS_CHANGED_QOS;
1592
1593         /* The BSSID (not really interesting) and HT changed */
1594         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1595         ieee80211_bss_info_change_notify(sdata, changed);
1596
1597         /* disassociated - set to defaults now */
1598         ieee80211_set_wmm_default(sdata, false);
1599
1600         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1601         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1602         del_timer_sync(&sdata->u.mgd.timer);
1603         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1604
1605         sdata->u.mgd.timers_running = 0;
1606
1607         sdata->vif.bss_conf.dtim_period = 0;
1608
1609         ifmgd->flags = 0;
1610         ieee80211_vif_release_channel(sdata);
1611 }
1612
1613 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1614                              struct ieee80211_hdr *hdr)
1615 {
1616         /*
1617          * We can postpone the mgd.timer whenever receiving unicast frames
1618          * from AP because we know that the connection is working both ways
1619          * at that time. But multicast frames (and hence also beacons) must
1620          * be ignored here, because we need to trigger the timer during
1621          * data idle periods for sending the periodic probe request to the
1622          * AP we're connected to.
1623          */
1624         if (is_multicast_ether_addr(hdr->addr1))
1625                 return;
1626
1627         ieee80211_sta_reset_conn_monitor(sdata);
1628 }
1629
1630 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1631 {
1632         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1633         struct ieee80211_local *local = sdata->local;
1634
1635         mutex_lock(&local->mtx);
1636         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1637                               IEEE80211_STA_CONNECTION_POLL))) {
1638                 mutex_unlock(&local->mtx);
1639                 return;
1640         }
1641
1642         __ieee80211_stop_poll(sdata);
1643
1644         mutex_lock(&local->iflist_mtx);
1645         ieee80211_recalc_ps(local, -1);
1646         mutex_unlock(&local->iflist_mtx);
1647
1648         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1649                 goto out;
1650
1651         /*
1652          * We've received a probe response, but are not sure whether
1653          * we have or will be receiving any beacons or data, so let's
1654          * schedule the timers again, just in case.
1655          */
1656         ieee80211_sta_reset_beacon_monitor(sdata);
1657
1658         mod_timer(&ifmgd->conn_mon_timer,
1659                   round_jiffies_up(jiffies +
1660                                    IEEE80211_CONNECTION_IDLE_TIME));
1661 out:
1662         mutex_unlock(&local->mtx);
1663 }
1664
1665 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1666                              struct ieee80211_hdr *hdr, bool ack)
1667 {
1668         if (!ieee80211_is_data(hdr->frame_control))
1669             return;
1670
1671         if (ack)
1672                 ieee80211_sta_reset_conn_monitor(sdata);
1673
1674         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1675             sdata->u.mgd.probe_send_count > 0) {
1676                 if (ack)
1677                         sdata->u.mgd.probe_send_count = 0;
1678                 else
1679                         sdata->u.mgd.nullfunc_failed = true;
1680                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1681         }
1682 }
1683
1684 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1685 {
1686         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1687         const u8 *ssid;
1688         u8 *dst = ifmgd->associated->bssid;
1689         u8 unicast_limit = max(1, max_probe_tries - 3);
1690
1691         /*
1692          * Try sending broadcast probe requests for the last three
1693          * probe requests after the first ones failed since some
1694          * buggy APs only support broadcast probe requests.
1695          */
1696         if (ifmgd->probe_send_count >= unicast_limit)
1697                 dst = NULL;
1698
1699         /*
1700          * When the hardware reports an accurate Tx ACK status, it's
1701          * better to send a nullfunc frame instead of a probe request,
1702          * as it will kick us off the AP quickly if we aren't associated
1703          * anymore. The timeout will be reset if the frame is ACKed by
1704          * the AP.
1705          */
1706         ifmgd->probe_send_count++;
1707
1708         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1709                 ifmgd->nullfunc_failed = false;
1710                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1711         } else {
1712                 int ssid_len;
1713
1714                 rcu_read_lock();
1715                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1716                 if (WARN_ON_ONCE(ssid == NULL))
1717                         ssid_len = 0;
1718                 else
1719                         ssid_len = ssid[1];
1720
1721                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1722                                          0, (u32) -1, true, false,
1723                                          ifmgd->associated->channel, false);
1724                 rcu_read_unlock();
1725         }
1726
1727         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1728         run_again(ifmgd, ifmgd->probe_timeout);
1729         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1730                 drv_flush(sdata->local, false);
1731 }
1732
1733 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1734                                    bool beacon)
1735 {
1736         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1737         bool already = false;
1738
1739         if (!ieee80211_sdata_running(sdata))
1740                 return;
1741
1742         mutex_lock(&ifmgd->mtx);
1743
1744         if (!ifmgd->associated)
1745                 goto out;
1746
1747         mutex_lock(&sdata->local->mtx);
1748
1749         if (sdata->local->tmp_channel || sdata->local->scanning) {
1750                 mutex_unlock(&sdata->local->mtx);
1751                 goto out;
1752         }
1753
1754         if (beacon)
1755                 mlme_dbg_ratelimited(sdata,
1756                                      "detected beacon loss from AP - sending probe request\n");
1757
1758         ieee80211_cqm_rssi_notify(&sdata->vif,
1759                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1760
1761         /*
1762          * The driver/our work has already reported this event or the
1763          * connection monitoring has kicked in and we have already sent
1764          * a probe request. Or maybe the AP died and the driver keeps
1765          * reporting until we disassociate...
1766          *
1767          * In either case we have to ignore the current call to this
1768          * function (except for setting the correct probe reason bit)
1769          * because otherwise we would reset the timer every time and
1770          * never check whether we received a probe response!
1771          */
1772         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1773                             IEEE80211_STA_CONNECTION_POLL))
1774                 already = true;
1775
1776         if (beacon)
1777                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1778         else
1779                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1780
1781         mutex_unlock(&sdata->local->mtx);
1782
1783         if (already)
1784                 goto out;
1785
1786         mutex_lock(&sdata->local->iflist_mtx);
1787         ieee80211_recalc_ps(sdata->local, -1);
1788         mutex_unlock(&sdata->local->iflist_mtx);
1789
1790         ifmgd->probe_send_count = 0;
1791         ieee80211_mgd_probe_ap_send(sdata);
1792  out:
1793         mutex_unlock(&ifmgd->mtx);
1794 }
1795
1796 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1797                                           struct ieee80211_vif *vif)
1798 {
1799         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1800         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1801         struct cfg80211_bss *cbss;
1802         struct sk_buff *skb;
1803         const u8 *ssid;
1804         int ssid_len;
1805
1806         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1807                 return NULL;
1808
1809         ASSERT_MGD_MTX(ifmgd);
1810
1811         if (ifmgd->associated)
1812                 cbss = ifmgd->associated;
1813         else if (ifmgd->auth_data)
1814                 cbss = ifmgd->auth_data->bss;
1815         else if (ifmgd->assoc_data)
1816                 cbss = ifmgd->assoc_data->bss;
1817         else
1818                 return NULL;
1819
1820         rcu_read_lock();
1821         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1822         if (WARN_ON_ONCE(ssid == NULL))
1823                 ssid_len = 0;
1824         else
1825                 ssid_len = ssid[1];
1826
1827         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1828                                         (u32) -1, cbss->channel,
1829                                         ssid + 2, ssid_len,
1830                                         NULL, 0, true);
1831         rcu_read_unlock();
1832
1833         return skb;
1834 }
1835 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1836
1837 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata,
1838                                    bool transmit_frame)
1839 {
1840         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1841         struct ieee80211_local *local = sdata->local;
1842         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1843
1844         mutex_lock(&ifmgd->mtx);
1845         if (!ifmgd->associated) {
1846                 mutex_unlock(&ifmgd->mtx);
1847                 return;
1848         }
1849
1850         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1851                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1852                                transmit_frame, frame_buf);
1853         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1854         mutex_unlock(&ifmgd->mtx);
1855
1856         /*
1857          * must be outside lock due to cfg80211,
1858          * but that's not a problem.
1859          */
1860         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
1861
1862         mutex_lock(&local->mtx);
1863         ieee80211_recalc_idle(local);
1864         mutex_unlock(&local->mtx);
1865 }
1866
1867 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1868 {
1869         struct ieee80211_sub_if_data *sdata =
1870                 container_of(work, struct ieee80211_sub_if_data,
1871                              u.mgd.beacon_connection_loss_work);
1872         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1873         struct sta_info *sta;
1874
1875         if (ifmgd->associated) {
1876                 rcu_read_lock();
1877                 sta = sta_info_get(sdata, ifmgd->bssid);
1878                 if (sta)
1879                         sta->beacon_loss_count++;
1880                 rcu_read_unlock();
1881         }
1882
1883         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) {
1884                 sdata_info(sdata, "Connection to AP %pM lost\n",
1885                            ifmgd->bssid);
1886                 __ieee80211_disconnect(sdata, false);
1887         } else {
1888                 ieee80211_mgd_probe_ap(sdata, true);
1889         }
1890 }
1891
1892 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
1893 {
1894         struct ieee80211_sub_if_data *sdata =
1895                 container_of(work, struct ieee80211_sub_if_data,
1896                              u.mgd.csa_connection_drop_work);
1897
1898         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1899                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1900         __ieee80211_disconnect(sdata, true);
1901 }
1902
1903 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1904 {
1905         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1906         struct ieee80211_hw *hw = &sdata->local->hw;
1907
1908         trace_api_beacon_loss(sdata);
1909
1910         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1911         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1912 }
1913 EXPORT_SYMBOL(ieee80211_beacon_loss);
1914
1915 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1916 {
1917         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1918         struct ieee80211_hw *hw = &sdata->local->hw;
1919
1920         trace_api_connection_loss(sdata);
1921
1922         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1923         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1924 }
1925 EXPORT_SYMBOL(ieee80211_connection_loss);
1926
1927
1928 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1929                                         bool assoc)
1930 {
1931         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1932
1933         lockdep_assert_held(&sdata->u.mgd.mtx);
1934
1935         if (!assoc) {
1936                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1937
1938                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1939                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1940                 sdata->u.mgd.flags = 0;
1941                 ieee80211_vif_release_channel(sdata);
1942         }
1943
1944         cfg80211_put_bss(auth_data->bss);
1945         kfree(auth_data);
1946         sdata->u.mgd.auth_data = NULL;
1947 }
1948
1949 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1950                                      struct ieee80211_mgmt *mgmt, size_t len)
1951 {
1952         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1953         u8 *pos;
1954         struct ieee802_11_elems elems;
1955
1956         pos = mgmt->u.auth.variable;
1957         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1958         if (!elems.challenge)
1959                 return;
1960         auth_data->expected_transaction = 4;
1961         drv_mgd_prepare_tx(sdata->local, sdata);
1962         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
1963                             elems.challenge - 2, elems.challenge_len + 2,
1964                             auth_data->bss->bssid, auth_data->bss->bssid,
1965                             auth_data->key, auth_data->key_len,
1966                             auth_data->key_idx);
1967 }
1968
1969 static enum rx_mgmt_action __must_check
1970 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1971                        struct ieee80211_mgmt *mgmt, size_t len)
1972 {
1973         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1974         u8 bssid[ETH_ALEN];
1975         u16 auth_alg, auth_transaction, status_code;
1976         struct sta_info *sta;
1977
1978         lockdep_assert_held(&ifmgd->mtx);
1979
1980         if (len < 24 + 6)
1981                 return RX_MGMT_NONE;
1982
1983         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1984                 return RX_MGMT_NONE;
1985
1986         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1987
1988         if (!ether_addr_equal(bssid, mgmt->bssid))
1989                 return RX_MGMT_NONE;
1990
1991         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1992         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1993         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1994
1995         if (auth_alg != ifmgd->auth_data->algorithm ||
1996             auth_transaction != ifmgd->auth_data->expected_transaction) {
1997                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
1998                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
1999                            auth_transaction,
2000                            ifmgd->auth_data->expected_transaction);
2001                 return RX_MGMT_NONE;
2002         }
2003
2004         if (status_code != WLAN_STATUS_SUCCESS) {
2005                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2006                            mgmt->sa, status_code);
2007                 ieee80211_destroy_auth_data(sdata, false);
2008                 return RX_MGMT_CFG80211_RX_AUTH;
2009         }
2010
2011         switch (ifmgd->auth_data->algorithm) {
2012         case WLAN_AUTH_OPEN:
2013         case WLAN_AUTH_LEAP:
2014         case WLAN_AUTH_FT:
2015         case WLAN_AUTH_SAE:
2016                 break;
2017         case WLAN_AUTH_SHARED_KEY:
2018                 if (ifmgd->auth_data->expected_transaction != 4) {
2019                         ieee80211_auth_challenge(sdata, mgmt, len);
2020                         /* need another frame */
2021                         return RX_MGMT_NONE;
2022                 }
2023                 break;
2024         default:
2025                 WARN_ONCE(1, "invalid auth alg %d",
2026                           ifmgd->auth_data->algorithm);
2027                 return RX_MGMT_NONE;
2028         }
2029
2030         sdata_info(sdata, "authenticated\n");
2031         ifmgd->auth_data->done = true;
2032         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2033         run_again(ifmgd, ifmgd->auth_data->timeout);
2034
2035         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2036             ifmgd->auth_data->expected_transaction != 2) {
2037                 /*
2038                  * Report auth frame to user space for processing since another
2039                  * round of Authentication frames is still needed.
2040                  */
2041                 return RX_MGMT_CFG80211_RX_AUTH;
2042         }
2043
2044         /* move station state to auth */
2045         mutex_lock(&sdata->local->sta_mtx);
2046         sta = sta_info_get(sdata, bssid);
2047         if (!sta) {
2048                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2049                 goto out_err;
2050         }
2051         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2052                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2053                 goto out_err;
2054         }
2055         mutex_unlock(&sdata->local->sta_mtx);
2056
2057         return RX_MGMT_CFG80211_RX_AUTH;
2058  out_err:
2059         mutex_unlock(&sdata->local->sta_mtx);
2060         /* ignore frame -- wait for timeout */
2061         return RX_MGMT_NONE;
2062 }
2063
2064
2065 static enum rx_mgmt_action __must_check
2066 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2067                          struct ieee80211_mgmt *mgmt, size_t len)
2068 {
2069         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2070         const u8 *bssid = NULL;
2071         u16 reason_code;
2072
2073         lockdep_assert_held(&ifmgd->mtx);
2074
2075         if (len < 24 + 2)
2076                 return RX_MGMT_NONE;
2077
2078         if (!ifmgd->associated ||
2079             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2080                 return RX_MGMT_NONE;
2081
2082         bssid = ifmgd->associated->bssid;
2083
2084         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2085
2086         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2087                    bssid, reason_code);
2088
2089         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2090
2091         mutex_lock(&sdata->local->mtx);
2092         ieee80211_recalc_idle(sdata->local);
2093         mutex_unlock(&sdata->local->mtx);
2094
2095         return RX_MGMT_CFG80211_DEAUTH;
2096 }
2097
2098
2099 static enum rx_mgmt_action __must_check
2100 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2101                            struct ieee80211_mgmt *mgmt, size_t len)
2102 {
2103         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2104         u16 reason_code;
2105
2106         lockdep_assert_held(&ifmgd->mtx);
2107
2108         if (len < 24 + 2)
2109                 return RX_MGMT_NONE;
2110
2111         if (!ifmgd->associated ||
2112             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2113                 return RX_MGMT_NONE;
2114
2115         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2116
2117         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2118                    mgmt->sa, reason_code);
2119
2120         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2121
2122         mutex_lock(&sdata->local->mtx);
2123         ieee80211_recalc_idle(sdata->local);
2124         mutex_unlock(&sdata->local->mtx);
2125
2126         return RX_MGMT_CFG80211_DISASSOC;
2127 }
2128
2129 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2130                                 u8 *supp_rates, unsigned int supp_rates_len,
2131                                 u32 *rates, u32 *basic_rates,
2132                                 bool *have_higher_than_11mbit,
2133                                 int *min_rate, int *min_rate_index)
2134 {
2135         int i, j;
2136
2137         for (i = 0; i < supp_rates_len; i++) {
2138                 int rate = (supp_rates[i] & 0x7f) * 5;
2139                 bool is_basic = !!(supp_rates[i] & 0x80);
2140
2141                 if (rate > 110)
2142                         *have_higher_than_11mbit = true;
2143
2144                 /*
2145                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2146                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2147                  *
2148                  * Note: Even through the membership selector and the basic
2149                  *       rate flag share the same bit, they are not exactly
2150                  *       the same.
2151                  */
2152                 if (!!(supp_rates[i] & 0x80) &&
2153                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2154                         continue;
2155
2156                 for (j = 0; j < sband->n_bitrates; j++) {
2157                         if (sband->bitrates[j].bitrate == rate) {
2158                                 *rates |= BIT(j);
2159                                 if (is_basic)
2160                                         *basic_rates |= BIT(j);
2161                                 if (rate < *min_rate) {
2162                                         *min_rate = rate;
2163                                         *min_rate_index = j;
2164                                 }
2165                                 break;
2166                         }
2167                 }
2168         }
2169 }
2170
2171 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2172                                          bool assoc)
2173 {
2174         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2175
2176         lockdep_assert_held(&sdata->u.mgd.mtx);
2177
2178         if (!assoc) {
2179                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2180
2181                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2182                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2183                 sdata->u.mgd.flags = 0;
2184                 ieee80211_vif_release_channel(sdata);
2185         }
2186
2187         kfree(assoc_data);
2188         sdata->u.mgd.assoc_data = NULL;
2189 }
2190
2191 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2192                                     struct cfg80211_bss *cbss,
2193                                     struct ieee80211_mgmt *mgmt, size_t len)
2194 {
2195         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2196         struct ieee80211_local *local = sdata->local;
2197         struct ieee80211_supported_band *sband;
2198         struct sta_info *sta;
2199         u8 *pos;
2200         u16 capab_info, aid;
2201         struct ieee802_11_elems elems;
2202         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2203         u32 changed = 0;
2204         int err;
2205
2206         /* AssocResp and ReassocResp have identical structure */
2207
2208         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2209         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2210
2211         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2212                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2213                            aid);
2214         aid &= ~(BIT(15) | BIT(14));
2215
2216         ifmgd->broken_ap = false;
2217
2218         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2219                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2220                            aid);
2221                 aid = 0;
2222                 ifmgd->broken_ap = true;
2223         }
2224
2225         pos = mgmt->u.assoc_resp.variable;
2226         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2227
2228         if (!elems.supp_rates) {
2229                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2230                 return false;
2231         }
2232
2233         ifmgd->aid = aid;
2234
2235         mutex_lock(&sdata->local->sta_mtx);
2236         /*
2237          * station info was already allocated and inserted before
2238          * the association and should be available to us
2239          */
2240         sta = sta_info_get(sdata, cbss->bssid);
2241         if (WARN_ON(!sta)) {
2242                 mutex_unlock(&sdata->local->sta_mtx);
2243                 return false;
2244         }
2245
2246         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2247
2248         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2249                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2250                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2251
2252         sta->supports_40mhz =
2253                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2254
2255         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2256                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2257                                                     elems.vht_cap_elem,
2258                                                     &sta->sta.vht_cap);
2259
2260         rate_control_rate_init(sta);
2261
2262         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2263                 set_sta_flag(sta, WLAN_STA_MFP);
2264
2265         if (elems.wmm_param)
2266                 set_sta_flag(sta, WLAN_STA_WME);
2267
2268         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2269         if (!err)
2270                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2271         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2272                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2273         if (err) {
2274                 sdata_info(sdata,
2275                            "failed to move station %pM to desired state\n",
2276                            sta->sta.addr);
2277                 WARN_ON(__sta_info_destroy(sta));
2278                 mutex_unlock(&sdata->local->sta_mtx);
2279                 return false;
2280         }
2281
2282         mutex_unlock(&sdata->local->sta_mtx);
2283
2284         /*
2285          * Always handle WMM once after association regardless
2286          * of the first value the AP uses. Setting -1 here has
2287          * that effect because the AP values is an unsigned
2288          * 4-bit value.
2289          */
2290         ifmgd->wmm_last_param_set = -1;
2291
2292         if (elems.wmm_param)
2293                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2294                                          elems.wmm_param_len);
2295         else
2296                 ieee80211_set_wmm_default(sdata, false);
2297         changed |= BSS_CHANGED_QOS;
2298
2299         if (elems.ht_operation && elems.wmm_param &&
2300             !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2301                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2302                                                   cbss->bssid, false);
2303
2304         /* set AID and assoc capability,
2305          * ieee80211_set_associated() will tell the driver */
2306         bss_conf->aid = aid;
2307         bss_conf->assoc_capability = capab_info;
2308         ieee80211_set_associated(sdata, cbss, changed);
2309
2310         /*
2311          * If we're using 4-addr mode, let the AP know that we're
2312          * doing so, so that it can create the STA VLAN on its side
2313          */
2314         if (ifmgd->use_4addr)
2315                 ieee80211_send_4addr_nullfunc(local, sdata);
2316
2317         /*
2318          * Start timer to probe the connection to the AP now.
2319          * Also start the timer that will detect beacon loss.
2320          */
2321         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2322         ieee80211_sta_reset_beacon_monitor(sdata);
2323
2324         return true;
2325 }
2326
2327 static enum rx_mgmt_action __must_check
2328 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2329                              struct ieee80211_mgmt *mgmt, size_t len,
2330                              struct cfg80211_bss **bss)
2331 {
2332         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2333         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2334         u16 capab_info, status_code, aid;
2335         struct ieee802_11_elems elems;
2336         u8 *pos;
2337         bool reassoc;
2338
2339         lockdep_assert_held(&ifmgd->mtx);
2340
2341         if (!assoc_data)
2342                 return RX_MGMT_NONE;
2343         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2344                 return RX_MGMT_NONE;
2345
2346         /*
2347          * AssocResp and ReassocResp have identical structure, so process both
2348          * of them in this function.
2349          */
2350
2351         if (len < 24 + 6)
2352                 return RX_MGMT_NONE;
2353
2354         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2355         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2356         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2357         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2358
2359         sdata_info(sdata,
2360                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2361                    reassoc ? "Rea" : "A", mgmt->sa,
2362                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2363
2364         pos = mgmt->u.assoc_resp.variable;
2365         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2366
2367         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2368             elems.timeout_int && elems.timeout_int_len == 5 &&
2369             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2370                 u32 tu, ms;
2371                 tu = get_unaligned_le32(elems.timeout_int + 1);
2372                 ms = tu * 1024 / 1000;
2373                 sdata_info(sdata,
2374                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2375                            mgmt->sa, tu, ms);
2376                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2377                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2378                         run_again(ifmgd, assoc_data->timeout);
2379                 return RX_MGMT_NONE;
2380         }
2381
2382         *bss = assoc_data->bss;
2383
2384         if (status_code != WLAN_STATUS_SUCCESS) {
2385                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2386                            mgmt->sa, status_code);
2387                 ieee80211_destroy_assoc_data(sdata, false);
2388         } else {
2389                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2390                         /* oops -- internal error -- send timeout for now */
2391                         ieee80211_destroy_assoc_data(sdata, false);
2392                         cfg80211_put_bss(*bss);
2393                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2394                 }
2395                 sdata_info(sdata, "associated\n");
2396
2397                 /*
2398                  * destroy assoc_data afterwards, as otherwise an idle
2399                  * recalc after assoc_data is NULL but before associated
2400                  * is set can cause the interface to go idle
2401                  */
2402                 ieee80211_destroy_assoc_data(sdata, true);
2403         }
2404
2405         return RX_MGMT_CFG80211_RX_ASSOC;
2406 }
2407
2408 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2409                                   struct ieee80211_mgmt *mgmt, size_t len,
2410                                   struct ieee80211_rx_status *rx_status,
2411                                   struct ieee802_11_elems *elems)
2412 {
2413         struct ieee80211_local *local = sdata->local;
2414         int freq;
2415         struct ieee80211_bss *bss;
2416         struct ieee80211_channel *channel;
2417         bool need_ps = false;
2418
2419         if ((sdata->u.mgd.associated &&
2420              ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) ||
2421             (sdata->u.mgd.assoc_data &&
2422              ether_addr_equal(mgmt->bssid,
2423                               sdata->u.mgd.assoc_data->bss->bssid))) {
2424                 /* not previously set so we may need to recalc */
2425                 need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period;
2426
2427                 if (elems->tim && !elems->parse_error) {
2428                         struct ieee80211_tim_ie *tim_ie = elems->tim;
2429                         sdata->u.mgd.dtim_period = tim_ie->dtim_period;
2430                 }
2431         }
2432
2433         if (elems->ds_params && elems->ds_params_len == 1)
2434                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2435                                                       rx_status->band);
2436         else
2437                 freq = rx_status->freq;
2438
2439         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2440
2441         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2442                 return;
2443
2444         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2445                                         channel);
2446         if (bss)
2447                 ieee80211_rx_bss_put(local, bss);
2448
2449         if (!sdata->u.mgd.associated)
2450                 return;
2451
2452         if (need_ps) {
2453                 mutex_lock(&local->iflist_mtx);
2454                 ieee80211_recalc_ps(local, -1);
2455                 mutex_unlock(&local->iflist_mtx);
2456         }
2457
2458         if (elems->ch_switch_ie &&
2459             memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2460                 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2461                                                  bss, rx_status->mactime);
2462 }
2463
2464
2465 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2466                                          struct sk_buff *skb)
2467 {
2468         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2469         struct ieee80211_if_managed *ifmgd;
2470         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2471         size_t baselen, len = skb->len;
2472         struct ieee802_11_elems elems;
2473
2474         ifmgd = &sdata->u.mgd;
2475
2476         ASSERT_MGD_MTX(ifmgd);
2477
2478         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2479                 return; /* ignore ProbeResp to foreign address */
2480
2481         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2482         if (baselen > len)
2483                 return;
2484
2485         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2486                                 &elems);
2487
2488         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2489
2490         if (ifmgd->associated &&
2491             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2492                 ieee80211_reset_ap_probe(sdata);
2493
2494         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2495             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2496                 /* got probe response, continue with auth */
2497                 sdata_info(sdata, "direct probe responded\n");
2498                 ifmgd->auth_data->tries = 0;
2499                 ifmgd->auth_data->timeout = jiffies;
2500                 run_again(ifmgd, ifmgd->auth_data->timeout);
2501         }
2502 }
2503
2504 /*
2505  * This is the canonical list of information elements we care about,
2506  * the filter code also gives us all changes to the Microsoft OUI
2507  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2508  *
2509  * We implement beacon filtering in software since that means we can
2510  * avoid processing the frame here and in cfg80211, and userspace
2511  * will not be able to tell whether the hardware supports it or not.
2512  *
2513  * XXX: This list needs to be dynamic -- userspace needs to be able to
2514  *      add items it requires. It also needs to be able to tell us to
2515  *      look out for other vendor IEs.
2516  */
2517 static const u64 care_about_ies =
2518         (1ULL << WLAN_EID_COUNTRY) |
2519         (1ULL << WLAN_EID_ERP_INFO) |
2520         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2521         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2522         (1ULL << WLAN_EID_HT_CAPABILITY) |
2523         (1ULL << WLAN_EID_HT_OPERATION);
2524
2525 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2526                                      struct ieee80211_mgmt *mgmt,
2527                                      size_t len,
2528                                      struct ieee80211_rx_status *rx_status)
2529 {
2530         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2531         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2532         size_t baselen;
2533         struct ieee802_11_elems elems;
2534         struct ieee80211_local *local = sdata->local;
2535         struct ieee80211_chanctx_conf *chanctx_conf;
2536         struct ieee80211_channel *chan;
2537         u32 changed = 0;
2538         bool erp_valid;
2539         u8 erp_value = 0;
2540         u32 ncrc;
2541         u8 *bssid;
2542
2543         lockdep_assert_held(&ifmgd->mtx);
2544
2545         /* Process beacon from the current BSS */
2546         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2547         if (baselen > len)
2548                 return;
2549
2550         rcu_read_lock();
2551         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2552         if (!chanctx_conf) {
2553                 rcu_read_unlock();
2554                 return;
2555         }
2556
2557         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2558                 rcu_read_unlock();
2559                 return;
2560         }
2561         chan = chanctx_conf->def.chan;
2562         rcu_read_unlock();
2563
2564         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2565             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2566                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2567                                        len - baselen, &elems);
2568
2569                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2570                 ifmgd->assoc_data->have_beacon = true;
2571                 ifmgd->assoc_data->sent_assoc = false;
2572                 /* continue assoc process */
2573                 ifmgd->assoc_data->timeout = jiffies;
2574                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2575                 return;
2576         }
2577
2578         if (!ifmgd->associated ||
2579             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2580                 return;
2581         bssid = ifmgd->associated->bssid;
2582
2583         /* Track average RSSI from the Beacon frames of the current AP */
2584         ifmgd->last_beacon_signal = rx_status->signal;
2585         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2586                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2587                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2588                 ifmgd->last_cqm_event_signal = 0;
2589                 ifmgd->count_beacon_signal = 1;
2590                 ifmgd->last_ave_beacon_signal = 0;
2591         } else {
2592                 ifmgd->ave_beacon_signal =
2593                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2594                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2595                          ifmgd->ave_beacon_signal) / 16;
2596                 ifmgd->count_beacon_signal++;
2597         }
2598
2599         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2600             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2601                 int sig = ifmgd->ave_beacon_signal;
2602                 int last_sig = ifmgd->last_ave_beacon_signal;
2603
2604                 /*
2605                  * if signal crosses either of the boundaries, invoke callback
2606                  * with appropriate parameters
2607                  */
2608                 if (sig > ifmgd->rssi_max_thold &&
2609                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2610                         ifmgd->last_ave_beacon_signal = sig;
2611                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2612                 } else if (sig < ifmgd->rssi_min_thold &&
2613                            (last_sig >= ifmgd->rssi_max_thold ||
2614                            last_sig == 0)) {
2615                         ifmgd->last_ave_beacon_signal = sig;
2616                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2617                 }
2618         }
2619
2620         if (bss_conf->cqm_rssi_thold &&
2621             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2622             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2623                 int sig = ifmgd->ave_beacon_signal / 16;
2624                 int last_event = ifmgd->last_cqm_event_signal;
2625                 int thold = bss_conf->cqm_rssi_thold;
2626                 int hyst = bss_conf->cqm_rssi_hyst;
2627                 if (sig < thold &&
2628                     (last_event == 0 || sig < last_event - hyst)) {
2629                         ifmgd->last_cqm_event_signal = sig;
2630                         ieee80211_cqm_rssi_notify(
2631                                 &sdata->vif,
2632                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2633                                 GFP_KERNEL);
2634                 } else if (sig > thold &&
2635                            (last_event == 0 || sig > last_event + hyst)) {
2636                         ifmgd->last_cqm_event_signal = sig;
2637                         ieee80211_cqm_rssi_notify(
2638                                 &sdata->vif,
2639                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2640                                 GFP_KERNEL);
2641                 }
2642         }
2643
2644         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2645                 mlme_dbg_ratelimited(sdata,
2646                                      "cancelling probereq poll due to a received beacon\n");
2647                 mutex_lock(&local->mtx);
2648                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2649                 ieee80211_run_deferred_scan(local);
2650                 mutex_unlock(&local->mtx);
2651
2652                 mutex_lock(&local->iflist_mtx);
2653                 ieee80211_recalc_ps(local, -1);
2654                 mutex_unlock(&local->iflist_mtx);
2655         }
2656
2657         /*
2658          * Push the beacon loss detection into the future since
2659          * we are processing a beacon from the AP just now.
2660          */
2661         ieee80211_sta_reset_beacon_monitor(sdata);
2662
2663         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2664         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2665                                           len - baselen, &elems,
2666                                           care_about_ies, ncrc);
2667
2668         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2669                 bool directed_tim = ieee80211_check_tim(elems.tim,
2670                                                         elems.tim_len,
2671                                                         ifmgd->aid);
2672                 if (directed_tim) {
2673                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2674                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2675                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2676                                         ieee80211_hw_config(local,
2677                                                             IEEE80211_CONF_CHANGE_PS);
2678                                 }
2679                                 ieee80211_send_nullfunc(local, sdata, 0);
2680                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2681                                 local->pspolling = true;
2682
2683                                 /*
2684                                  * Here is assumed that the driver will be
2685                                  * able to send ps-poll frame and receive a
2686                                  * response even though power save mode is
2687                                  * enabled, but some drivers might require
2688                                  * to disable power save here. This needs
2689                                  * to be investigated.
2690                                  */
2691                                 ieee80211_send_pspoll(local, sdata);
2692                         }
2693                 }
2694         }
2695
2696         if (sdata->vif.p2p) {
2697                 u8 noa[2];
2698                 int ret;
2699
2700                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2701                                             len - baselen,
2702                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2703                                             noa, sizeof(noa));
2704                 if (ret >= 2 && sdata->u.mgd.p2p_noa_index != noa[0]) {
2705                         bss_conf->p2p_oppps = noa[1] & 0x80;
2706                         bss_conf->p2p_ctwindow = noa[1] & 0x7f;
2707                         changed |= BSS_CHANGED_P2P_PS;
2708                         sdata->u.mgd.p2p_noa_index = noa[0];
2709                         /*
2710                          * make sure we update all information, the CRC
2711                          * mechanism doesn't look at P2P attributes.
2712                          */
2713                         ifmgd->beacon_crc_valid = false;
2714                 }
2715         }
2716
2717         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2718                 return;
2719         ifmgd->beacon_crc = ncrc;
2720         ifmgd->beacon_crc_valid = true;
2721
2722         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2723
2724         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2725                                      elems.wmm_param_len))
2726                 changed |= BSS_CHANGED_QOS;
2727
2728         if (elems.erp_info && elems.erp_info_len >= 1) {
2729                 erp_valid = true;
2730                 erp_value = elems.erp_info[0];
2731         } else {
2732                 erp_valid = false;
2733         }
2734         changed |= ieee80211_handle_bss_capability(sdata,
2735                         le16_to_cpu(mgmt->u.beacon.capab_info),
2736                         erp_valid, erp_value);
2737
2738
2739         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2740             !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2741                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2742                                                   bssid, true);
2743
2744         if (elems.country_elem && elems.pwr_constr_elem &&
2745             mgmt->u.probe_resp.capab_info &
2746                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
2747                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
2748                                                        elems.country_elem,
2749                                                        elems.country_elem_len,
2750                                                        elems.pwr_constr_elem);
2751
2752         ieee80211_bss_info_change_notify(sdata, changed);
2753 }
2754
2755 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2756                                   struct sk_buff *skb)
2757 {
2758         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2759         struct ieee80211_rx_status *rx_status;
2760         struct ieee80211_mgmt *mgmt;
2761         struct cfg80211_bss *bss = NULL;
2762         enum rx_mgmt_action rma = RX_MGMT_NONE;
2763         u16 fc;
2764
2765         rx_status = (struct ieee80211_rx_status *) skb->cb;
2766         mgmt = (struct ieee80211_mgmt *) skb->data;
2767         fc = le16_to_cpu(mgmt->frame_control);
2768
2769         mutex_lock(&ifmgd->mtx);
2770
2771         switch (fc & IEEE80211_FCTL_STYPE) {
2772         case IEEE80211_STYPE_BEACON:
2773                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2774                 break;
2775         case IEEE80211_STYPE_PROBE_RESP:
2776                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2777                 break;
2778         case IEEE80211_STYPE_AUTH:
2779                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2780                 break;
2781         case IEEE80211_STYPE_DEAUTH:
2782                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2783                 break;
2784         case IEEE80211_STYPE_DISASSOC:
2785                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2786                 break;
2787         case IEEE80211_STYPE_ASSOC_RESP:
2788         case IEEE80211_STYPE_REASSOC_RESP:
2789                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2790                 break;
2791         case IEEE80211_STYPE_ACTION:
2792                 switch (mgmt->u.action.category) {
2793                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2794                         ieee80211_sta_process_chanswitch(sdata,
2795                                         &mgmt->u.action.u.chan_switch.sw_elem,
2796                                         (void *)ifmgd->associated->priv,
2797                                         rx_status->mactime);
2798                         break;
2799                 }
2800         }
2801         mutex_unlock(&ifmgd->mtx);
2802
2803         switch (rma) {
2804         case RX_MGMT_NONE:
2805                 /* no action */
2806                 break;
2807         case RX_MGMT_CFG80211_DEAUTH:
2808                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2809                 break;
2810         case RX_MGMT_CFG80211_DISASSOC:
2811                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2812                 break;
2813         case RX_MGMT_CFG80211_RX_AUTH:
2814                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2815                 break;
2816         case RX_MGMT_CFG80211_RX_ASSOC:
2817                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2818                 break;
2819         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2820                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2821                 break;
2822         default:
2823                 WARN(1, "unexpected: %d", rma);
2824         }
2825 }
2826
2827 static void ieee80211_sta_timer(unsigned long data)
2828 {
2829         struct ieee80211_sub_if_data *sdata =
2830                 (struct ieee80211_sub_if_data *) data;
2831         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2832         struct ieee80211_local *local = sdata->local;
2833
2834         if (local->quiescing) {
2835                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2836                 return;
2837         }
2838
2839         ieee80211_queue_work(&local->hw, &sdata->work);
2840 }
2841
2842 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2843                                           u8 *bssid, u8 reason)
2844 {
2845         struct ieee80211_local *local = sdata->local;
2846         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2847         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2848
2849         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2850                                false, frame_buf);
2851         mutex_unlock(&ifmgd->mtx);
2852
2853         /*
2854          * must be outside lock due to cfg80211,
2855          * but that's not a problem.
2856          */
2857         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2858
2859         mutex_lock(&local->mtx);
2860         ieee80211_recalc_idle(local);
2861         mutex_unlock(&local->mtx);
2862
2863         mutex_lock(&ifmgd->mtx);
2864 }
2865
2866 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2867 {
2868         struct ieee80211_local *local = sdata->local;
2869         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2870         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2871
2872         lockdep_assert_held(&ifmgd->mtx);
2873
2874         if (WARN_ON_ONCE(!auth_data))
2875                 return -EINVAL;
2876
2877         auth_data->tries++;
2878
2879         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2880                 sdata_info(sdata, "authentication with %pM timed out\n",
2881                            auth_data->bss->bssid);
2882
2883                 /*
2884                  * Most likely AP is not in the range so remove the
2885                  * bss struct for that AP.
2886                  */
2887                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2888
2889                 return -ETIMEDOUT;
2890         }
2891
2892         drv_mgd_prepare_tx(local, sdata);
2893
2894         if (auth_data->bss->proberesp_ies) {
2895                 u16 trans = 1;
2896                 u16 status = 0;
2897
2898                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2899                            auth_data->bss->bssid, auth_data->tries,
2900                            IEEE80211_AUTH_MAX_TRIES);
2901
2902                 auth_data->expected_transaction = 2;
2903
2904                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
2905                         trans = auth_data->sae_trans;
2906                         status = auth_data->sae_status;
2907                         auth_data->expected_transaction = trans;
2908                 }
2909
2910                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
2911                                     auth_data->data, auth_data->data_len,
2912                                     auth_data->bss->bssid,
2913                                     auth_data->bss->bssid, NULL, 0, 0);
2914         } else {
2915                 const u8 *ssidie;
2916
2917                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2918                            auth_data->bss->bssid, auth_data->tries,
2919                            IEEE80211_AUTH_MAX_TRIES);
2920
2921                 rcu_read_lock();
2922                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2923                 if (!ssidie) {
2924                         rcu_read_unlock();
2925                         return -EINVAL;
2926                 }
2927                 /*
2928                  * Direct probe is sent to broadcast address as some APs
2929                  * will not answer to direct packet in unassociated state.
2930                  */
2931                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2932                                          NULL, 0, (u32) -1, true, false,
2933                                          auth_data->bss->channel, false);
2934                 rcu_read_unlock();
2935         }
2936
2937         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2938         run_again(ifmgd, auth_data->timeout);
2939
2940         return 0;
2941 }
2942
2943 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2944 {
2945         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2946         struct ieee80211_local *local = sdata->local;
2947
2948         lockdep_assert_held(&sdata->u.mgd.mtx);
2949
2950         assoc_data->tries++;
2951         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2952                 sdata_info(sdata, "association with %pM timed out\n",
2953                            assoc_data->bss->bssid);
2954
2955                 /*
2956                  * Most likely AP is not in the range so remove the
2957                  * bss struct for that AP.
2958                  */
2959                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2960
2961                 return -ETIMEDOUT;
2962         }
2963
2964         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2965                    assoc_data->bss->bssid, assoc_data->tries,
2966                    IEEE80211_ASSOC_MAX_TRIES);
2967         ieee80211_send_assoc(sdata);
2968
2969         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2970         run_again(&sdata->u.mgd, assoc_data->timeout);
2971
2972         return 0;
2973 }
2974
2975 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2976 {
2977         struct ieee80211_local *local = sdata->local;
2978         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2979
2980         mutex_lock(&ifmgd->mtx);
2981
2982         if (ifmgd->auth_data &&
2983             time_after(jiffies, ifmgd->auth_data->timeout)) {
2984                 if (ifmgd->auth_data->done) {
2985                         /*
2986                          * ok ... we waited for assoc but userspace didn't,
2987                          * so let's just kill the auth data
2988                          */
2989                         ieee80211_destroy_auth_data(sdata, false);
2990                 } else if (ieee80211_probe_auth(sdata)) {
2991                         u8 bssid[ETH_ALEN];
2992
2993                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2994
2995                         ieee80211_destroy_auth_data(sdata, false);
2996
2997                         mutex_unlock(&ifmgd->mtx);
2998                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2999                         mutex_lock(&ifmgd->mtx);
3000                 }
3001         } else if (ifmgd->auth_data)
3002                 run_again(ifmgd, ifmgd->auth_data->timeout);
3003
3004         if (ifmgd->assoc_data &&
3005             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3006                 if (!ifmgd->assoc_data->have_beacon ||
3007                     ieee80211_do_assoc(sdata)) {
3008                         u8 bssid[ETH_ALEN];
3009
3010                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
3011
3012                         ieee80211_destroy_assoc_data(sdata, false);
3013
3014                         mutex_unlock(&ifmgd->mtx);
3015                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
3016                         mutex_lock(&ifmgd->mtx);
3017                 }
3018         } else if (ifmgd->assoc_data)
3019                 run_again(ifmgd, ifmgd->assoc_data->timeout);
3020
3021         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
3022                             IEEE80211_STA_CONNECTION_POLL) &&
3023             ifmgd->associated) {
3024                 u8 bssid[ETH_ALEN];
3025                 int max_tries;
3026
3027                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3028
3029                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3030                         max_tries = max_nullfunc_tries;
3031                 else
3032                         max_tries = max_probe_tries;
3033
3034                 /* ACK received for nullfunc probing frame */
3035                 if (!ifmgd->probe_send_count)
3036                         ieee80211_reset_ap_probe(sdata);
3037                 else if (ifmgd->nullfunc_failed) {
3038                         if (ifmgd->probe_send_count < max_tries) {
3039                                 mlme_dbg(sdata,
3040                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3041                                          bssid, ifmgd->probe_send_count,
3042                                          max_tries);
3043                                 ieee80211_mgd_probe_ap_send(sdata);
3044                         } else {
3045                                 mlme_dbg(sdata,
3046                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3047                                          bssid);
3048                                 ieee80211_sta_connection_lost(sdata, bssid,
3049                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3050                         }
3051                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3052                         run_again(ifmgd, ifmgd->probe_timeout);
3053                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3054                         mlme_dbg(sdata,
3055                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3056                                  bssid, probe_wait_ms);
3057                         ieee80211_sta_connection_lost(sdata, bssid,
3058                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3059                 } else if (ifmgd->probe_send_count < max_tries) {
3060                         mlme_dbg(sdata,
3061                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3062                                  bssid, probe_wait_ms,
3063                                  ifmgd->probe_send_count, max_tries);
3064                         ieee80211_mgd_probe_ap_send(sdata);
3065                 } else {
3066                         /*
3067                          * We actually lost the connection ... or did we?
3068                          * Let's make sure!
3069                          */
3070                         wiphy_debug(local->hw.wiphy,
3071                                     "%s: No probe response from AP %pM"
3072                                     " after %dms, disconnecting.\n",
3073                                     sdata->name,
3074                                     bssid, probe_wait_ms);
3075
3076                         ieee80211_sta_connection_lost(sdata, bssid,
3077                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3078                 }
3079         }
3080
3081         mutex_unlock(&ifmgd->mtx);
3082
3083         mutex_lock(&local->mtx);
3084         ieee80211_recalc_idle(local);
3085         mutex_unlock(&local->mtx);
3086 }
3087
3088 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3089 {
3090         struct ieee80211_sub_if_data *sdata =
3091                 (struct ieee80211_sub_if_data *) data;
3092         struct ieee80211_local *local = sdata->local;
3093
3094         if (local->quiescing)
3095                 return;
3096
3097         ieee80211_queue_work(&sdata->local->hw,
3098                              &sdata->u.mgd.beacon_connection_loss_work);
3099 }
3100
3101 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3102 {
3103         struct ieee80211_sub_if_data *sdata =
3104                 (struct ieee80211_sub_if_data *) data;
3105         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3106         struct ieee80211_local *local = sdata->local;
3107
3108         if (local->quiescing)
3109                 return;
3110
3111         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3112 }
3113
3114 static void ieee80211_sta_monitor_work(struct work_struct *work)
3115 {
3116         struct ieee80211_sub_if_data *sdata =
3117                 container_of(work, struct ieee80211_sub_if_data,
3118                              u.mgd.monitor_work);
3119
3120         ieee80211_mgd_probe_ap(sdata, false);
3121 }
3122
3123 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3124 {
3125         u32 flags;
3126
3127         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3128                 __ieee80211_stop_poll(sdata);
3129
3130                 /* let's probe the connection once */
3131                 flags = sdata->local->hw.flags;
3132                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3133                         ieee80211_queue_work(&sdata->local->hw,
3134                                              &sdata->u.mgd.monitor_work);
3135                 /* and do all the other regular work too */
3136                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3137         }
3138 }
3139
3140 #ifdef CONFIG_PM
3141 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
3142 {
3143         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3144
3145         /*
3146          * we need to use atomic bitops for the running bits
3147          * only because both timers might fire at the same
3148          * time -- the code here is properly synchronised.
3149          */
3150
3151         cancel_work_sync(&ifmgd->request_smps_work);
3152
3153         cancel_work_sync(&ifmgd->monitor_work);
3154         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
3155         cancel_work_sync(&ifmgd->csa_connection_drop_work);
3156         if (del_timer_sync(&ifmgd->timer))
3157                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
3158
3159         cancel_work_sync(&ifmgd->chswitch_work);
3160         if (del_timer_sync(&ifmgd->chswitch_timer))
3161                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
3162
3163         /* these will just be re-established on connection */
3164         del_timer_sync(&ifmgd->conn_mon_timer);
3165         del_timer_sync(&ifmgd->bcn_mon_timer);
3166 }
3167
3168 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3169 {
3170         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3171
3172         if (!ifmgd->associated)
3173                 return;
3174
3175         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3176                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3177                 mutex_lock(&ifmgd->mtx);
3178                 if (ifmgd->associated) {
3179                         mlme_dbg(sdata,
3180                                  "driver requested disconnect after resume\n");
3181                         ieee80211_sta_connection_lost(sdata,
3182                                 ifmgd->associated->bssid,
3183                                 WLAN_REASON_UNSPECIFIED);
3184                         mutex_unlock(&ifmgd->mtx);
3185                         return;
3186                 }
3187                 mutex_unlock(&ifmgd->mtx);
3188         }
3189
3190         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
3191                 add_timer(&ifmgd->timer);
3192         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
3193                 add_timer(&ifmgd->chswitch_timer);
3194         ieee80211_sta_reset_beacon_monitor(sdata);
3195
3196         mutex_lock(&sdata->local->mtx);
3197         ieee80211_restart_sta_timer(sdata);
3198         mutex_unlock(&sdata->local->mtx);
3199 }
3200 #endif
3201
3202 /* interface setup */
3203 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3204 {
3205         struct ieee80211_if_managed *ifmgd;
3206
3207         ifmgd = &sdata->u.mgd;
3208         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3209         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3210         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3211                   ieee80211_beacon_connection_loss_work);
3212         INIT_WORK(&ifmgd->csa_connection_drop_work,
3213                   ieee80211_csa_connection_drop_work);
3214         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3215         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3216                     (unsigned long) sdata);
3217         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3218                     (unsigned long) sdata);
3219         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3220                     (unsigned long) sdata);
3221         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3222                     (unsigned long) sdata);
3223
3224         ifmgd->flags = 0;
3225         ifmgd->powersave = sdata->wdev.ps;
3226         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3227         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3228
3229         mutex_init(&ifmgd->mtx);
3230
3231         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3232                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3233         else
3234                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3235 }
3236
3237 /* scan finished notification */
3238 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3239 {
3240         struct ieee80211_sub_if_data *sdata;
3241
3242         /* Restart STA timers */
3243         rcu_read_lock();
3244         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3245                 ieee80211_restart_sta_timer(sdata);
3246         rcu_read_unlock();
3247 }
3248
3249 int ieee80211_max_network_latency(struct notifier_block *nb,
3250                                   unsigned long data, void *dummy)
3251 {
3252         s32 latency_usec = (s32) data;
3253         struct ieee80211_local *local =
3254                 container_of(nb, struct ieee80211_local,
3255                              network_latency_notifier);
3256
3257         mutex_lock(&local->iflist_mtx);
3258         ieee80211_recalc_ps(local, latency_usec);
3259         mutex_unlock(&local->iflist_mtx);
3260
3261         return 0;
3262 }
3263
3264 static u32 chandef_downgrade(struct cfg80211_chan_def *c)
3265 {
3266         u32 ret;
3267         int tmp;
3268
3269         switch (c->width) {
3270         case NL80211_CHAN_WIDTH_20:
3271                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3272                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3273                 break;
3274         case NL80211_CHAN_WIDTH_40:
3275                 c->width = NL80211_CHAN_WIDTH_20;
3276                 c->center_freq1 = c->chan->center_freq;
3277                 ret = IEEE80211_STA_DISABLE_40MHZ |
3278                       IEEE80211_STA_DISABLE_VHT;
3279                 break;
3280         case NL80211_CHAN_WIDTH_80:
3281                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
3282                 /* n_P40 */
3283                 tmp /= 2;
3284                 /* freq_P40 */
3285                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
3286                 c->width = NL80211_CHAN_WIDTH_40;
3287                 ret = IEEE80211_STA_DISABLE_VHT;
3288                 break;
3289         case NL80211_CHAN_WIDTH_80P80:
3290                 c->center_freq2 = 0;
3291                 c->width = NL80211_CHAN_WIDTH_80;
3292                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3293                       IEEE80211_STA_DISABLE_160MHZ;
3294                 break;
3295         case NL80211_CHAN_WIDTH_160:
3296                 /* n_P20 */
3297                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
3298                 /* n_P80 */
3299                 tmp /= 4;
3300                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
3301                 c->width = NL80211_CHAN_WIDTH_80;
3302                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3303                       IEEE80211_STA_DISABLE_160MHZ;
3304                 break;
3305         default:
3306         case NL80211_CHAN_WIDTH_20_NOHT:
3307                 WARN_ON_ONCE(1);
3308                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3309                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3310                 break;
3311         }
3312
3313         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
3314
3315         return ret;
3316 }
3317
3318 static u32
3319 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
3320                              struct ieee80211_supported_band *sband,
3321                              struct ieee80211_channel *channel,
3322                              const struct ieee80211_ht_operation *ht_oper,
3323                              const struct ieee80211_vht_operation *vht_oper,
3324                              struct cfg80211_chan_def *chandef)
3325 {
3326         struct cfg80211_chan_def vht_chandef;
3327         u32 ht_cfreq, ret;
3328
3329         chandef->chan = channel;
3330         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
3331         chandef->center_freq1 = channel->center_freq;
3332         chandef->center_freq2 = 0;
3333
3334         if (!ht_oper || !sband->ht_cap.ht_supported) {
3335                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3336                 goto out;
3337         }
3338
3339         chandef->width = NL80211_CHAN_WIDTH_20;
3340
3341         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3342                                                   channel->band);
3343         /* check that channel matches the right operating channel */
3344         if (channel->center_freq != ht_cfreq) {
3345                 /*
3346                  * It's possible that some APs are confused here;
3347                  * Netgear WNDR3700 sometimes reports 4 higher than
3348                  * the actual channel in association responses, but
3349                  * since we look at probe response/beacon data here
3350                  * it should be OK.
3351                  */
3352                 sdata_info(sdata,
3353                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3354                            channel->center_freq, ht_cfreq,
3355                            ht_oper->primary_chan, channel->band);
3356                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3357                 goto out;
3358         }
3359
3360         /* check 40 MHz support, if we have it */
3361         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3362                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3363                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3364                         chandef->width = NL80211_CHAN_WIDTH_40;
3365                         chandef->center_freq1 += 10;
3366                         break;
3367                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3368                         chandef->width = NL80211_CHAN_WIDTH_40;
3369                         chandef->center_freq1 -= 10;
3370                         break;
3371                 }
3372         } else {
3373                 /* 40 MHz (and 80 MHz) must be supported for VHT */
3374                 ret = IEEE80211_STA_DISABLE_VHT;
3375                 goto out;
3376         }
3377
3378         if (!vht_oper || !sband->vht_cap.vht_supported) {
3379                 ret = IEEE80211_STA_DISABLE_VHT;
3380                 goto out;
3381         }
3382
3383         vht_chandef.chan = channel;
3384         vht_chandef.center_freq1 =
3385                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
3386                                                channel->band);
3387         vht_chandef.center_freq2 = 0;
3388
3389         if (vht_oper->center_freq_seg2_idx)
3390                 vht_chandef.center_freq2 =
3391                         ieee80211_channel_to_frequency(
3392                                 vht_oper->center_freq_seg2_idx,
3393                                 channel->band);
3394
3395         switch (vht_oper->chan_width) {
3396         case IEEE80211_VHT_CHANWIDTH_USE_HT:
3397                 vht_chandef.width = chandef->width;
3398                 break;
3399         case IEEE80211_VHT_CHANWIDTH_80MHZ:
3400                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
3401                 break;
3402         case IEEE80211_VHT_CHANWIDTH_160MHZ:
3403                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
3404                 break;
3405         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
3406                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
3407                 break;
3408         default:
3409                 sdata_info(sdata,
3410                            "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
3411                            vht_oper->chan_width);
3412                 ret = IEEE80211_STA_DISABLE_VHT;
3413                 goto out;
3414         }
3415
3416         if (!cfg80211_chandef_valid(&vht_chandef)) {
3417                 sdata_info(sdata,
3418                            "AP VHT information is invalid, disable VHT\n");
3419                 ret = IEEE80211_STA_DISABLE_VHT;
3420                 goto out;
3421         }
3422
3423         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
3424                 ret = 0;
3425                 goto out;
3426         }
3427
3428         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
3429                 sdata_info(sdata,
3430                            "AP VHT information doesn't match HT, disable VHT\n");
3431                 ret = IEEE80211_STA_DISABLE_VHT;
3432                 goto out;
3433         }
3434
3435         *chandef = vht_chandef;
3436
3437         ret = 0;
3438
3439         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
3440                                         IEEE80211_CHAN_DISABLED)) {
3441                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
3442                         ret = IEEE80211_STA_DISABLE_HT |
3443                               IEEE80211_STA_DISABLE_VHT;
3444                         goto out;
3445                 }
3446
3447                 ret = chandef_downgrade(chandef);
3448         }
3449
3450         if (chandef->width != vht_chandef.width)
3451                 sdata_info(sdata,
3452                            "local regulatory prevented using AP HT/VHT configuration, downgraded\n");
3453
3454 out:
3455         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
3456         return ret;
3457 }
3458
3459 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3460                                      struct cfg80211_bss *cbss)
3461 {
3462         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3463         const u8 *ht_cap_ie, *vht_cap_ie;
3464         const struct ieee80211_ht_cap *ht_cap;
3465         const struct ieee80211_vht_cap *vht_cap;
3466         u8 chains = 1;
3467
3468         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3469                 return chains;
3470
3471         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3472         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3473                 ht_cap = (void *)(ht_cap_ie + 2);
3474                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3475                 /*
3476                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3477                  *       "Tx Unequal Modulation Supported" fields.
3478                  */
3479         }
3480
3481         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3482                 return chains;
3483
3484         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3485         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3486                 u8 nss;
3487                 u16 tx_mcs_map;
3488
3489                 vht_cap = (void *)(vht_cap_ie + 2);
3490                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3491                 for (nss = 8; nss > 0; nss--) {
3492                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3493                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3494                                 break;
3495                 }
3496                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3497                 chains = max(chains, nss);
3498         }
3499
3500         return chains;
3501 }
3502
3503 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3504                                   struct cfg80211_bss *cbss)
3505 {
3506         struct ieee80211_local *local = sdata->local;
3507         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3508         const struct ieee80211_ht_operation *ht_oper = NULL;
3509         const struct ieee80211_vht_operation *vht_oper = NULL;
3510         struct ieee80211_supported_band *sband;
3511         struct cfg80211_chan_def chandef;
3512         int ret;
3513
3514         sband = local->hw.wiphy->bands[cbss->channel->band];
3515
3516         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3517                           IEEE80211_STA_DISABLE_80P80MHZ |
3518                           IEEE80211_STA_DISABLE_160MHZ);
3519
3520         rcu_read_lock();
3521
3522         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3523             sband->ht_cap.ht_supported) {
3524                 const u8 *ht_oper_ie;
3525
3526                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3527                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3528                         ht_oper = (void *)(ht_oper_ie + 2);
3529         }
3530
3531         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3532             sband->vht_cap.vht_supported) {
3533                 const u8 *vht_oper_ie;
3534
3535                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3536                                                    WLAN_EID_VHT_OPERATION);
3537                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3538                         vht_oper = (void *)(vht_oper_ie + 2);
3539                 if (vht_oper && !ht_oper) {
3540                         vht_oper = NULL;
3541                         sdata_info(sdata,
3542                                    "AP advertised VHT without HT, disabling both\n");
3543                         sdata->flags |= IEEE80211_STA_DISABLE_HT;
3544                         sdata->flags |= IEEE80211_STA_DISABLE_VHT;
3545                 }
3546         }
3547
3548         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3549                                                      cbss->channel,
3550                                                      ht_oper, vht_oper,
3551                                                      &chandef);
3552
3553         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3554                                       local->rx_chains);
3555
3556         rcu_read_unlock();
3557
3558         /* will change later if needed */
3559         sdata->smps_mode = IEEE80211_SMPS_OFF;
3560
3561         /*
3562          * If this fails (possibly due to channel context sharing
3563          * on incompatible channels, e.g. 80+80 and 160 sharing the
3564          * same control channel) try to use a smaller bandwidth.
3565          */
3566         ret = ieee80211_vif_use_channel(sdata, &chandef,
3567                                         IEEE80211_CHANCTX_SHARED);
3568         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
3569                 ifmgd->flags |= chandef_downgrade(&chandef);
3570         return ret;
3571 }
3572
3573 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3574                                      struct cfg80211_bss *cbss, bool assoc)
3575 {
3576         struct ieee80211_local *local = sdata->local;
3577         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3578         struct ieee80211_bss *bss = (void *)cbss->priv;
3579         struct sta_info *new_sta = NULL;
3580         bool have_sta = false;
3581         int err;
3582
3583         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3584                 return -EINVAL;
3585
3586         if (assoc) {
3587                 rcu_read_lock();
3588                 have_sta = sta_info_get(sdata, cbss->bssid);
3589                 rcu_read_unlock();
3590         }
3591
3592         if (!have_sta) {
3593                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3594                 if (!new_sta)
3595                         return -ENOMEM;
3596         }
3597
3598         mutex_lock(&local->mtx);
3599         ieee80211_recalc_idle(sdata->local);
3600         mutex_unlock(&local->mtx);
3601
3602         if (new_sta) {
3603                 u32 rates = 0, basic_rates = 0;
3604                 bool have_higher_than_11mbit;
3605                 int min_rate = INT_MAX, min_rate_index = -1;
3606                 struct ieee80211_supported_band *sband;
3607
3608                 sband = local->hw.wiphy->bands[cbss->channel->band];
3609
3610                 err = ieee80211_prep_channel(sdata, cbss);
3611                 if (err) {
3612                         sta_info_free(local, new_sta);
3613                         return err;
3614                 }
3615
3616                 ieee80211_get_rates(sband, bss->supp_rates,
3617                                     bss->supp_rates_len,
3618                                     &rates, &basic_rates,
3619                                     &have_higher_than_11mbit,
3620                                     &min_rate, &min_rate_index);
3621
3622                 /*
3623                  * This used to be a workaround for basic rates missing
3624                  * in the association response frame. Now that we no
3625                  * longer use the basic rates from there, it probably
3626                  * doesn't happen any more, but keep the workaround so
3627                  * in case some *other* APs are buggy in different ways
3628                  * we can connect -- with a warning.
3629                  */
3630                 if (!basic_rates && min_rate_index >= 0) {
3631                         sdata_info(sdata,
3632                                    "No basic rates, using min rate instead\n");
3633                         basic_rates = BIT(min_rate_index);
3634                 }
3635
3636                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3637                 sdata->vif.bss_conf.basic_rates = basic_rates;
3638
3639                 /* cf. IEEE 802.11 9.2.12 */
3640                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3641                     have_higher_than_11mbit)
3642                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3643                 else
3644                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3645
3646                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3647
3648                 /* set timing information */
3649                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3650                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3651                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3652
3653                 /* tell driver about BSSID, basic rates and timing */
3654                 ieee80211_bss_info_change_notify(sdata,
3655                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3656                         BSS_CHANGED_BEACON_INT);
3657
3658                 if (assoc)
3659                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3660
3661                 err = sta_info_insert(new_sta);
3662                 new_sta = NULL;
3663                 if (err) {
3664                         sdata_info(sdata,
3665                                    "failed to insert STA entry for the AP (error %d)\n",
3666                                    err);
3667                         return err;
3668                 }
3669         } else
3670                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3671
3672         return 0;
3673 }
3674
3675 /* config hooks */
3676 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3677                        struct cfg80211_auth_request *req)
3678 {
3679         struct ieee80211_local *local = sdata->local;
3680         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3681         struct ieee80211_mgd_auth_data *auth_data;
3682         u16 auth_alg;
3683         int err;
3684
3685         /* prepare auth data structure */
3686
3687         switch (req->auth_type) {
3688         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3689                 auth_alg = WLAN_AUTH_OPEN;
3690                 break;
3691         case NL80211_AUTHTYPE_SHARED_KEY:
3692                 if (IS_ERR(local->wep_tx_tfm))
3693                         return -EOPNOTSUPP;
3694                 auth_alg = WLAN_AUTH_SHARED_KEY;
3695                 break;
3696         case NL80211_AUTHTYPE_FT:
3697                 auth_alg = WLAN_AUTH_FT;
3698                 break;
3699         case NL80211_AUTHTYPE_NETWORK_EAP:
3700                 auth_alg = WLAN_AUTH_LEAP;
3701                 break;
3702         case NL80211_AUTHTYPE_SAE:
3703                 auth_alg = WLAN_AUTH_SAE;
3704                 break;
3705         default:
3706                 return -EOPNOTSUPP;
3707         }
3708
3709         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3710                             req->ie_len, GFP_KERNEL);
3711         if (!auth_data)
3712                 return -ENOMEM;
3713
3714         auth_data->bss = req->bss;
3715
3716         if (req->sae_data_len >= 4) {
3717                 __le16 *pos = (__le16 *) req->sae_data;
3718                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3719                 auth_data->sae_status = le16_to_cpu(pos[1]);
3720                 memcpy(auth_data->data, req->sae_data + 4,
3721                        req->sae_data_len - 4);
3722                 auth_data->data_len += req->sae_data_len - 4;
3723         }
3724
3725         if (req->ie && req->ie_len) {
3726                 memcpy(&auth_data->data[auth_data->data_len],
3727                        req->ie, req->ie_len);
3728                 auth_data->data_len += req->ie_len;
3729         }
3730
3731         if (req->key && req->key_len) {
3732                 auth_data->key_len = req->key_len;
3733                 auth_data->key_idx = req->key_idx;
3734                 memcpy(auth_data->key, req->key, req->key_len);
3735         }
3736
3737         auth_data->algorithm = auth_alg;
3738
3739         /* try to authenticate/probe */
3740
3741         mutex_lock(&ifmgd->mtx);
3742
3743         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3744             ifmgd->assoc_data) {
3745                 err = -EBUSY;
3746                 goto err_free;
3747         }
3748
3749         if (ifmgd->auth_data)
3750                 ieee80211_destroy_auth_data(sdata, false);
3751
3752         /* prep auth_data so we don't go into idle on disassoc */
3753         ifmgd->auth_data = auth_data;
3754
3755         if (ifmgd->associated)
3756                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3757
3758         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3759
3760         err = ieee80211_prep_connection(sdata, req->bss, false);
3761         if (err)
3762                 goto err_clear;
3763
3764         err = ieee80211_probe_auth(sdata);
3765         if (err) {
3766                 sta_info_destroy_addr(sdata, req->bss->bssid);
3767                 goto err_clear;
3768         }
3769
3770         /* hold our own reference */
3771         cfg80211_ref_bss(auth_data->bss);
3772         err = 0;
3773         goto out_unlock;
3774
3775  err_clear:
3776         memset(ifmgd->bssid, 0, ETH_ALEN);
3777         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3778         ifmgd->auth_data = NULL;
3779  err_free:
3780         kfree(auth_data);
3781  out_unlock:
3782         mutex_unlock(&ifmgd->mtx);
3783
3784         return err;
3785 }
3786
3787 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3788                         struct cfg80211_assoc_request *req)
3789 {
3790         struct ieee80211_local *local = sdata->local;
3791         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3792         struct ieee80211_bss *bss = (void *)req->bss->priv;
3793         struct ieee80211_mgd_assoc_data *assoc_data;
3794         struct ieee80211_supported_band *sband;
3795         const u8 *ssidie, *ht_ie, *vht_ie;
3796         int i, err;
3797
3798         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3799         if (!assoc_data)
3800                 return -ENOMEM;
3801
3802         rcu_read_lock();
3803         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3804         if (!ssidie) {
3805                 rcu_read_unlock();
3806                 kfree(assoc_data);
3807                 return -EINVAL;
3808         }
3809         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3810         assoc_data->ssid_len = ssidie[1];
3811         rcu_read_unlock();
3812
3813         mutex_lock(&ifmgd->mtx);
3814
3815         if (ifmgd->associated)
3816                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3817
3818         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3819                 err = -EBUSY;
3820                 goto err_free;
3821         }
3822
3823         if (ifmgd->assoc_data) {
3824                 err = -EBUSY;
3825                 goto err_free;
3826         }
3827
3828         if (ifmgd->auth_data) {
3829                 bool match;
3830
3831                 /* keep sta info, bssid if matching */
3832                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3833                 ieee80211_destroy_auth_data(sdata, match);
3834         }
3835
3836         /* prepare assoc data */
3837
3838         ifmgd->beacon_crc_valid = false;
3839
3840         /*
3841          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3842          * We still associate in non-HT mode (11a/b/g) if any one of these
3843          * ciphers is configured as pairwise.
3844          * We can set this to true for non-11n hardware, that'll be checked
3845          * separately along with the peer capabilities.
3846          */
3847         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3848                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3849                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3850                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3851                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3852                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3853                         netdev_info(sdata->dev,
3854                                     "disabling HT/VHT due to WEP/TKIP use\n");
3855                 }
3856         }
3857
3858         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3859                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3860                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3861         }
3862
3863         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3864         sband = local->hw.wiphy->bands[req->bss->channel->band];
3865         if (!sband->ht_cap.ht_supported ||
3866             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3867                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3868                 if (!bss->wmm_used)
3869                         netdev_info(sdata->dev,
3870                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3871         }
3872
3873         /* disable VHT if we don't support it or the AP doesn't use WMM */
3874         if (!sband->vht_cap.vht_supported ||
3875             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3876                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3877                 if (!bss->wmm_used)
3878                         netdev_info(sdata->dev,
3879                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3880         }
3881
3882         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3883         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3884                sizeof(ifmgd->ht_capa_mask));
3885
3886         if (req->ie && req->ie_len) {
3887                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3888                 assoc_data->ie_len = req->ie_len;
3889         }
3890
3891         assoc_data->bss = req->bss;
3892
3893         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3894                 if (ifmgd->powersave)
3895                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
3896                 else
3897                         sdata->smps_mode = IEEE80211_SMPS_OFF;
3898         } else
3899                 sdata->smps_mode = ifmgd->req_smps;
3900
3901         assoc_data->capability = req->bss->capability;
3902         assoc_data->wmm = bss->wmm_used &&
3903                           (local->hw.queues >= IEEE80211_NUM_ACS);
3904         assoc_data->supp_rates = bss->supp_rates;
3905         assoc_data->supp_rates_len = bss->supp_rates_len;
3906
3907         rcu_read_lock();
3908         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3909         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3910                 assoc_data->ap_ht_param =
3911                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3912         else
3913                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3914         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
3915         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
3916                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
3917                        sizeof(struct ieee80211_vht_cap));
3918         else
3919                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3920         rcu_read_unlock();
3921
3922         if (bss->wmm_used && bss->uapsd_supported &&
3923             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3924                 assoc_data->uapsd = true;
3925                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3926         } else {
3927                 assoc_data->uapsd = false;
3928                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3929         }
3930
3931         if (req->prev_bssid)
3932                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3933
3934         if (req->use_mfp) {
3935                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3936                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3937         } else {
3938                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3939                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3940         }
3941
3942         if (req->crypto.control_port)
3943                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3944         else
3945                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3946
3947         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3948         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3949
3950         /* kick off associate process */
3951
3952         ifmgd->assoc_data = assoc_data;
3953         ifmgd->dtim_period = 0;
3954
3955         err = ieee80211_prep_connection(sdata, req->bss, true);
3956         if (err)
3957                 goto err_clear;
3958
3959         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3960                 const struct cfg80211_bss_ies *beacon_ies;
3961
3962                 rcu_read_lock();
3963                 beacon_ies = rcu_dereference(req->bss->beacon_ies);
3964                 if (!beacon_ies) {
3965                         /*
3966                          * Wait up to one beacon interval ...
3967                          * should this be more if we miss one?
3968                          */
3969                         sdata_info(sdata, "waiting for beacon from %pM\n",
3970                                    ifmgd->bssid);
3971                         assoc_data->timeout =
3972                                 TU_TO_EXP_TIME(req->bss->beacon_interval);
3973                 } else {
3974                         const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3975                                                             beacon_ies->data,
3976                                                             beacon_ies->len);
3977                         if (tim_ie && tim_ie[1] >=
3978                                         sizeof(struct ieee80211_tim_ie)) {
3979                                 const struct ieee80211_tim_ie *tim;
3980                                 tim = (void *)(tim_ie + 2);
3981                                 ifmgd->dtim_period = tim->dtim_period;
3982                         }
3983                         assoc_data->have_beacon = true;
3984                         assoc_data->sent_assoc = false;
3985                         assoc_data->timeout = jiffies;
3986                 }
3987                 rcu_read_unlock();
3988         } else {
3989                 assoc_data->have_beacon = true;
3990                 assoc_data->sent_assoc = false;
3991                 assoc_data->timeout = jiffies;
3992         }
3993         run_again(ifmgd, assoc_data->timeout);
3994
3995         if (bss->corrupt_data) {
3996                 char *corrupt_type = "data";
3997                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3998                         if (bss->corrupt_data &
3999                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4000                                 corrupt_type = "beacon and probe response";
4001                         else
4002                                 corrupt_type = "beacon";
4003                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4004                         corrupt_type = "probe response";
4005                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4006                            corrupt_type);
4007         }
4008
4009         err = 0;
4010         goto out;
4011  err_clear:
4012         memset(ifmgd->bssid, 0, ETH_ALEN);
4013         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4014         ifmgd->assoc_data = NULL;
4015  err_free:
4016         kfree(assoc_data);
4017  out:
4018         mutex_unlock(&ifmgd->mtx);
4019
4020         return err;
4021 }
4022
4023 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4024                          struct cfg80211_deauth_request *req)
4025 {
4026         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4027         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4028         bool tx = !req->local_state_change;
4029         bool sent_frame = false;
4030
4031         mutex_lock(&ifmgd->mtx);
4032
4033         sdata_info(sdata,
4034                    "deauthenticating from %pM by local choice (reason=%d)\n",
4035                    req->bssid, req->reason_code);
4036
4037         if (ifmgd->auth_data) {
4038                 drv_mgd_prepare_tx(sdata->local, sdata);
4039                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4040                                                IEEE80211_STYPE_DEAUTH,
4041                                                req->reason_code, tx,
4042                                                frame_buf);
4043                 ieee80211_destroy_auth_data(sdata, false);
4044                 mutex_unlock(&ifmgd->mtx);
4045
4046                 sent_frame = tx;
4047                 goto out;
4048         }
4049
4050         if (ifmgd->associated &&
4051             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4052                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4053                                        req->reason_code, tx, frame_buf);
4054                 sent_frame = tx;
4055         }
4056         mutex_unlock(&ifmgd->mtx);
4057
4058  out:
4059         mutex_lock(&sdata->local->mtx);
4060         ieee80211_recalc_idle(sdata->local);
4061         mutex_unlock(&sdata->local->mtx);
4062
4063         if (sent_frame)
4064                 __cfg80211_send_deauth(sdata->dev, frame_buf,
4065                                        IEEE80211_DEAUTH_FRAME_LEN);
4066
4067         return 0;
4068 }
4069
4070 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4071                            struct cfg80211_disassoc_request *req)
4072 {
4073         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4074         u8 bssid[ETH_ALEN];
4075         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4076
4077         mutex_lock(&ifmgd->mtx);
4078
4079         /*
4080          * cfg80211 should catch this ... but it's racy since
4081          * we can receive a disassoc frame, process it, hand it
4082          * to cfg80211 while that's in a locked section already
4083          * trying to tell us that the user wants to disconnect.
4084          */
4085         if (ifmgd->associated != req->bss) {
4086                 mutex_unlock(&ifmgd->mtx);
4087                 return -ENOLINK;
4088         }
4089
4090         sdata_info(sdata,
4091                    "disassociating from %pM by local choice (reason=%d)\n",
4092                    req->bss->bssid, req->reason_code);
4093
4094         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4095         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4096                                req->reason_code, !req->local_state_change,
4097                                frame_buf);
4098         mutex_unlock(&ifmgd->mtx);
4099
4100         __cfg80211_send_disassoc(sdata->dev, frame_buf,
4101                                  IEEE80211_DEAUTH_FRAME_LEN);
4102
4103         mutex_lock(&sdata->local->mtx);
4104         ieee80211_recalc_idle(sdata->local);
4105         mutex_unlock(&sdata->local->mtx);
4106
4107         return 0;
4108 }
4109
4110 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4111 {
4112         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4113
4114         mutex_lock(&ifmgd->mtx);
4115         if (ifmgd->assoc_data)
4116                 ieee80211_destroy_assoc_data(sdata, false);
4117         if (ifmgd->auth_data)
4118                 ieee80211_destroy_auth_data(sdata, false);
4119         del_timer_sync(&ifmgd->timer);
4120         mutex_unlock(&ifmgd->mtx);
4121 }
4122
4123 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4124                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4125                                gfp_t gfp)
4126 {
4127         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4128
4129         trace_api_cqm_rssi_notify(sdata, rssi_event);
4130
4131         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4132 }
4133 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);