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_HT40PLUS)
 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_HT40MINUS)
 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 {
 346         u8 *pos;
 347         u32 cap;
 348         struct ieee80211_sta_vht_cap vht_cap;
 349
 350         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 351
 352         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 353
 354         /* determine capability flags */
 355         cap = vht_cap.cap;
 356
 357         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 358                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 359                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 360         }
 361
 362         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 363                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 364                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 365         }
 366
 367         /* reserve and fill IE */
 368         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 369         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 370 }
 371
 372 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 373 {
 374         struct ieee80211_local *local = sdata->local;
 375         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 376         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 377         struct sk_buff *skb;
 378         struct ieee80211_mgmt *mgmt;
 379         u8 *pos, qos_info;
 380         size_t offset = 0, noffset;
 381         int i, count, rates_len, supp_rates_len;
 382         u16 capab;
 383         struct ieee80211_supported_band *sband;
 384         struct ieee80211_chanctx_conf *chanctx_conf;
 385         struct ieee80211_channel *chan;
 386         u32 rates = 0;
 387
 388         lockdep_assert_held(&ifmgd->mtx);
 389
 390         rcu_read_lock();
 391         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 392         if (WARN_ON(!chanctx_conf)) {
 393                 rcu_read_unlock();
 394                 return;
 395         }
 396         chan = chanctx_conf->def.chan;
 397         rcu_read_unlock();
 398         sband = local->hw.wiphy->bands[chan->band];
 399
 400         if (assoc_data->supp_rates_len) {
 401                 /*
 402                  * Get all rates supported by the device and the AP as
 403                  * some APs don't like getting a superset of their rates
 404                  * in the association request (e.g. D-Link DAP 1353 in
 405                  * b-only mode)...
 406                  */
 407                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 408                                                        assoc_data->supp_rates_len,
 409                                                        sband, &rates);
 410         } else {
 411                 /*
 412                  * In case AP not provide any supported rates information
 413                  * before association, we send information element(s) with
 414                  * all rates that we support.
 415                  */
 416                 rates = ~0;
 417                 rates_len = sband->n_bitrates;
 418         }
 419
 420         skb = alloc_skb(local->hw.extra_tx_headroom +
 421                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 422                         2 + assoc_data->ssid_len + /* SSID */
 423                         4 + rates_len + /* (extended) rates */
 424                         4 + /* power capability */
 425                         2 + 2 * sband->n_channels + /* supported channels */
 426                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 427                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 428                         assoc_data->ie_len + /* extra IEs */
 429                         9, /* WMM */
 430                         GFP_KERNEL);
 431         if (!skb)
 432                 return;
 433
 434         skb_reserve(skb, local->hw.extra_tx_headroom);
 435
 436         capab = WLAN_CAPABILITY_ESS;
 437
 438         if (sband->band == IEEE80211_BAND_2GHZ) {
 439                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 440                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 441                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 442                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 443         }
 444
 445         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 446                 capab |= WLAN_CAPABILITY_PRIVACY;
 447
 448         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 449             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 450                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 451
 452         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 453         memset(mgmt, 0, 24);
 454         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 455         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 456         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 457
 458         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 459                 skb_put(skb, 10);
 460                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 461                                                   IEEE80211_STYPE_REASSOC_REQ);
 462                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 463                 mgmt->u.reassoc_req.listen_interval =
 464                                 cpu_to_le16(local->hw.conf.listen_interval);
 465                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 466                        ETH_ALEN);
 467         } else {
 468                 skb_put(skb, 4);
 469                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 470                                                   IEEE80211_STYPE_ASSOC_REQ);
 471                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 472                 mgmt->u.assoc_req.listen_interval =
 473                                 cpu_to_le16(local->hw.conf.listen_interval);
 474         }
 475
 476         /* SSID */
 477         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 478         *pos++ = WLAN_EID_SSID;
 479         *pos++ = assoc_data->ssid_len;
 480         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 481
 482         /* add all rates which were marked to be used above */
 483         supp_rates_len = rates_len;
 484         if (supp_rates_len > 8)
 485                 supp_rates_len = 8;
 486
 487         pos = skb_put(skb, supp_rates_len + 2);
 488         *pos++ = WLAN_EID_SUPP_RATES;
 489         *pos++ = supp_rates_len;
 490
 491         count = 0;
 492         for (i = 0; i < sband->n_bitrates; i++) {
 493                 if (BIT(i) & rates) {
 494                         int rate = sband->bitrates[i].bitrate;
 495                         *pos++ = (u8) (rate / 5);
 496                         if (++count == 8)
 497                                 break;
 498                 }
 499         }
 500
 501         if (rates_len > count) {
 502                 pos = skb_put(skb, rates_len - count + 2);
 503                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 504                 *pos++ = rates_len - count;
 505
 506                 for (i++; i < sband->n_bitrates; i++) {
 507                         if (BIT(i) & rates) {
 508                                 int rate = sband->bitrates[i].bitrate;
 509                                 *pos++ = (u8) (rate / 5);
 510                         }
 511                 }
 512         }
 513
 514         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 515                 /* 1. power capabilities */
 516                 pos = skb_put(skb, 4);
 517                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 518                 *pos++ = 2;
 519                 *pos++ = 0; /* min tx power */
 520                 *pos++ = chan->max_power; /* max tx power */
 521
 522                 /* 2. supported channels */
 523                 /* TODO: get this in reg domain format */
 524                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 525                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 526                 *pos++ = 2 * sband->n_channels;
 527                 for (i = 0; i < sband->n_channels; i++) {
 528                         *pos++ = ieee80211_frequency_to_channel(
 529                                         sband->channels[i].center_freq);
 530                         *pos++ = 1; /* one channel in the subband*/
 531                 }
 532         }
 533
 534         /* if present, add any custom IEs that go before HT */
 535         if (assoc_data->ie_len && assoc_data->ie) {
 536                 static const u8 before_ht[] = {
 537                         WLAN_EID_SSID,
 538                         WLAN_EID_SUPP_RATES,
 539                         WLAN_EID_EXT_SUPP_RATES,
 540                         WLAN_EID_PWR_CAPABILITY,
 541                         WLAN_EID_SUPPORTED_CHANNELS,
 542                         WLAN_EID_RSN,
 543                         WLAN_EID_QOS_CAPA,
 544                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 545                         WLAN_EID_MOBILITY_DOMAIN,
 546                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 547                 };
 548                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 549                                              before_ht, ARRAY_SIZE(before_ht),
 550                                              offset);
 551                 pos = skb_put(skb, noffset - offset);
 552                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 553                 offset = noffset;
 554         }
 555
 556         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 557                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 558                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 559
 560         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 561                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 562                                     sband, chan, sdata->smps_mode);
 563
 564         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 565                 ieee80211_add_vht_ie(sdata, skb, sband);
 566
 567         /* if present, add any custom non-vendor IEs that go after HT */
 568         if (assoc_data->ie_len && assoc_data->ie) {
 569                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 570                                                     assoc_data->ie_len,
 571                                                     offset);
 572                 pos = skb_put(skb, noffset - offset);
 573                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 574                 offset = noffset;
 575         }
 576
 577         if (assoc_data->wmm) {
 578                 if (assoc_data->uapsd) {
 579                         qos_info = ifmgd->uapsd_queues;
 580                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 581                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 582                 } else {
 583                         qos_info = 0;
 584                 }
 585
 586                 pos = skb_put(skb, 9);
 587                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 588                 *pos++ = 7; /* len */
 589                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 590                 *pos++ = 0x50;
 591                 *pos++ = 0xf2;
 592                 *pos++ = 2; /* WME */
 593                 *pos++ = 0; /* WME info */
 594                 *pos++ = 1; /* WME ver */
 595                 *pos++ = qos_info;
 596         }
 597
 598         /* add any remaining custom (i.e. vendor specific here) IEs */
 599         if (assoc_data->ie_len && assoc_data->ie) {
 600                 noffset = assoc_data->ie_len;
 601                 pos = skb_put(skb, noffset - offset);
 602                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 603         }
 604
 605         drv_mgd_prepare_tx(local, sdata);
 606
 607         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 608         ieee80211_tx_skb(sdata, skb);
 609 }
 610
 611 void ieee80211_send_pspoll(struct ieee80211_local *local,
 612                            struct ieee80211_sub_if_data *sdata)
 613 {
 614         struct ieee80211_pspoll *pspoll;
 615         struct sk_buff *skb;
 616
 617         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 618         if (!skb)
 619                 return;
 620
 621         pspoll = (struct ieee80211_pspoll *) skb->data;
 622         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 623
 624         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 625         ieee80211_tx_skb(sdata, skb);
 626 }
 627
 628 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 629                              struct ieee80211_sub_if_data *sdata,
 630                              int powersave)
 631 {
 632         struct sk_buff *skb;
 633         struct ieee80211_hdr_3addr *nullfunc;
 634         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 635
 636         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 637         if (!skb)
 638                 return;
 639
 640         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 641         if (powersave)
 642                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 643
 644         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 645         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 646                             IEEE80211_STA_CONNECTION_POLL))
 647                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 648
 649         ieee80211_tx_skb(sdata, skb);
 650 }
 651
 652 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 653                                           struct ieee80211_sub_if_data *sdata)
 654 {
 655         struct sk_buff *skb;
 656         struct ieee80211_hdr *nullfunc;
 657         __le16 fc;
 658
 659         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 660                 return;
 661
 662         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 663         if (!skb)
 664                 return;
 665
 666         skb_reserve(skb, local->hw.extra_tx_headroom);
 667
 668         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 669         memset(nullfunc, 0, 30);
 670         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 671                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 672         nullfunc->frame_control = fc;
 673         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 674         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 675         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 676         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 677
 678         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 679         ieee80211_tx_skb(sdata, skb);
 680 }
 681
 682 /* spectrum management related things */
 683 static void ieee80211_chswitch_work(struct work_struct *work)
 684 {
 685         struct ieee80211_sub_if_data *sdata =
 686                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 687         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 688
 689         if (!ieee80211_sdata_running(sdata))
 690                 return;
 691
 692         mutex_lock(&ifmgd->mtx);
 693         if (!ifmgd->associated)
 694                 goto out;
 695
 696         sdata->local->_oper_channel = sdata->local->csa_channel;
 697         if (!sdata->local->ops->channel_switch) {
 698                 /* call "hw_config" only if doing sw channel switch */
 699                 ieee80211_hw_config(sdata->local,
 700                         IEEE80211_CONF_CHANGE_CHANNEL);
 701         } else {
 702                 /* update the device channel directly */
 703                 sdata->local->hw.conf.channel = sdata->local->_oper_channel;
 704         }
 705
 706         /* XXX: shouldn't really modify cfg80211-owned data! */
 707         ifmgd->associated->channel = sdata->local->_oper_channel;
 708
 709         /* XXX: wait for a beacon first? */
 710         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 711                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 712  out:
 713         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 714         mutex_unlock(&ifmgd->mtx);
 715 }
 716
 717 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 718 {
 719         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 720         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 721
 722         trace_api_chswitch_done(sdata, success);
 723         if (!success) {
 724                 sdata_info(sdata,
 725                            "driver channel switch failed, disconnecting\n");
 726                 ieee80211_queue_work(&sdata->local->hw,
 727                                      &ifmgd->csa_connection_drop_work);
 728         } else {
 729                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 730         }
 731 }
 732 EXPORT_SYMBOL(ieee80211_chswitch_done);
 733
 734 static void ieee80211_chswitch_timer(unsigned long data)
 735 {
 736         struct ieee80211_sub_if_data *sdata =
 737                 (struct ieee80211_sub_if_data *) data;
 738         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 739
 740         if (sdata->local->quiescing) {
 741                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 742                 return;
 743         }
 744
 745         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 746 }
 747
 748 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 749                                       struct ieee80211_channel_sw_ie *sw_elem,
 750                                       struct ieee80211_bss *bss,
 751                                       u64 timestamp)
 752 {
 753         struct cfg80211_bss *cbss =
 754                 container_of((void *)bss, struct cfg80211_bss, priv);
 755         struct ieee80211_channel *new_ch;
 756         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 757         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 758                                                       cbss->channel->band);
 759         struct ieee80211_chanctx *chanctx;
 760
 761         ASSERT_MGD_MTX(ifmgd);
 762
 763         if (!ifmgd->associated)
 764                 return;
 765
 766         if (sdata->local->scanning)
 767                 return;
 768
 769         /* Disregard subsequent beacons if we are already running a timer
 770            processing a CSA */
 771
 772         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 773                 return;
 774
 775         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 776         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
 777                 sdata_info(sdata,
 778                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
 779                            ifmgd->associated->bssid, new_freq);
 780                 ieee80211_queue_work(&sdata->local->hw,
 781                                      &ifmgd->csa_connection_drop_work);
 782                 return;
 783         }
 784
 785         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 786
 787         if (sdata->local->use_chanctx) {
 788                 sdata_info(sdata,
 789                            "not handling channel switch with channel contexts\n");
 790                 ieee80211_queue_work(&sdata->local->hw,
 791                                      &ifmgd->csa_connection_drop_work);
 792                 return;
 793         }
 794
 795         mutex_lock(&sdata->local->chanctx_mtx);
 796         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
 797                 mutex_unlock(&sdata->local->chanctx_mtx);
 798                 return;
 799         }
 800         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
 801                                struct ieee80211_chanctx, conf);
 802         if (chanctx->refcount > 1) {
 803                 sdata_info(sdata,
 804                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
 805                 ieee80211_queue_work(&sdata->local->hw,
 806                                      &ifmgd->csa_connection_drop_work);
 807                 mutex_unlock(&sdata->local->chanctx_mtx);
 808                 return;
 809         }
 810         mutex_unlock(&sdata->local->chanctx_mtx);
 811
 812         sdata->local->csa_channel = new_ch;
 813
 814         if (sw_elem->mode)
 815                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 816                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 817
 818         if (sdata->local->ops->channel_switch) {
 819                 /* use driver's channel switch callback */
 820                 struct ieee80211_channel_switch ch_switch = {
 821                         .timestamp = timestamp,
 822                         .block_tx = sw_elem->mode,
 823                         .channel = new_ch,
 824                         .count = sw_elem->count,
 825                 };
 826
 827                 drv_channel_switch(sdata->local, &ch_switch);
 828                 return;
 829         }
 830
 831         /* channel switch handled in software */
 832         if (sw_elem->count <= 1)
 833                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 834         else
 835                 mod_timer(&ifmgd->chswitch_timer,
 836                           TU_TO_EXP_TIME(sw_elem->count *
 837                                          cbss->beacon_interval));
 838 }
 839
 840 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 841                                        struct ieee80211_channel *channel,
 842                                        const u8 *country_ie, u8 country_ie_len,
 843                                        const u8 *pwr_constr_elem)
 844 {
 845         struct ieee80211_country_ie_triplet *triplet;
 846         int chan = ieee80211_frequency_to_channel(channel->center_freq);
 847         int i, chan_pwr, chan_increment, new_ap_level;
 848         bool have_chan_pwr = false;
 849
 850         /* Invalid IE */
 851         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
 852                 return 0;
 853
 854         triplet = (void *)(country_ie + 3);
 855         country_ie_len -= 3;
 856
 857         switch (channel->band) {
 858         default:
 859                 WARN_ON_ONCE(1);
 860                 /* fall through */
 861         case IEEE80211_BAND_2GHZ:
 862         case IEEE80211_BAND_60GHZ:
 863                 chan_increment = 1;
 864                 break;
 865         case IEEE80211_BAND_5GHZ:
 866                 chan_increment = 4;
 867                 break;
 868         }
 869
 870         /* find channel */
 871         while (country_ie_len >= 3) {
 872                 u8 first_channel = triplet->chans.first_channel;
 873
 874                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
 875                         goto next;
 876
 877                 for (i = 0; i < triplet->chans.num_channels; i++) {
 878                         if (first_channel + i * chan_increment == chan) {
 879                                 have_chan_pwr = true;
 880                                 chan_pwr = triplet->chans.max_power;
 881                                 break;
 882                         }
 883                 }
 884                 if (have_chan_pwr)
 885                         break;
 886
 887  next:
 888                 triplet++;
 889                 country_ie_len -= 3;
 890         }
 891
 892         if (!have_chan_pwr)
 893                 return 0;
 894
 895         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
 896
 897         if (sdata->ap_power_level == new_ap_level)
 898                 return 0;
 899
 900         sdata_info(sdata,
 901                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
 902                    new_ap_level, chan_pwr, *pwr_constr_elem,
 903                    sdata->u.mgd.bssid);
 904         sdata->ap_power_level = new_ap_level;
 905         if (__ieee80211_recalc_txpower(sdata))
 906                 return BSS_CHANGED_TXPOWER;
 907         return 0;
 908 }
 909
 910 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 911 {
 912         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 913         struct ieee80211_local *local = sdata->local;
 914         struct ieee80211_conf *conf = &local->hw.conf;
 915
 916         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 917                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 918                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 919
 920         local->disable_dynamic_ps = false;
 921         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 922 }
 923 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 924
 925 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 926 {
 927         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 928         struct ieee80211_local *local = sdata->local;
 929         struct ieee80211_conf *conf = &local->hw.conf;
 930
 931         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 932                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 933                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 934
 935         local->disable_dynamic_ps = true;
 936         conf->dynamic_ps_timeout = 0;
 937         del_timer_sync(&local->dynamic_ps_timer);
 938         ieee80211_queue_work(&local->hw,
 939                              &local->dynamic_ps_enable_work);
 940 }
 941 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 942
 943 /* powersave */
 944 static void ieee80211_enable_ps(struct ieee80211_local *local,
 945                                 struct ieee80211_sub_if_data *sdata)
 946 {
 947         struct ieee80211_conf *conf = &local->hw.conf;
 948
 949         /*
 950          * If we are scanning right now then the parameters will
 951          * take effect when scan finishes.
 952          */
 953         if (local->scanning)
 954                 return;
 955
 956         if (conf->dynamic_ps_timeout > 0 &&
 957             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 958                 mod_timer(&local->dynamic_ps_timer, jiffies +
 959                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 960         } else {
 961                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 962                         ieee80211_send_nullfunc(local, sdata, 1);
 963
 964                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 965                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 966                         return;
 967
 968                 conf->flags |= IEEE80211_CONF_PS;
 969                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 970         }
 971 }
 972
 973 static void ieee80211_change_ps(struct ieee80211_local *local)
 974 {
 975         struct ieee80211_conf *conf = &local->hw.conf;
 976
 977         if (local->ps_sdata) {
 978                 ieee80211_enable_ps(local, local->ps_sdata);
 979         } else if (conf->flags & IEEE80211_CONF_PS) {
 980                 conf->flags &= ~IEEE80211_CONF_PS;
 981                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 982                 del_timer_sync(&local->dynamic_ps_timer);
 983                 cancel_work_sync(&local->dynamic_ps_enable_work);
 984         }
 985 }
 986
 987 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 988 {
 989         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 990         struct sta_info *sta = NULL;
 991         bool authorized = false;
 992
 993         if (!mgd->powersave)
 994                 return false;
 995
 996         if (mgd->broken_ap)
 997                 return false;
 998
 999         if (!mgd->associated)
1000                 return false;
1001
1002         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
1003                           IEEE80211_STA_CONNECTION_POLL))
1004                 return false;
1005
1006         rcu_read_lock();
1007         sta = sta_info_get(sdata, mgd->bssid);
1008         if (sta)
1009                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1010         rcu_read_unlock();
1011
1012         return authorized;
1013 }
1014
1015 /* need to hold RTNL or interface lock */
1016 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1017 {
1018         struct ieee80211_sub_if_data *sdata, *found = NULL;
1019         int count = 0;
1020         int timeout;
1021
1022         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1023                 local->ps_sdata = NULL;
1024                 return;
1025         }
1026
1027         list_for_each_entry(sdata, &local->interfaces, list) {
1028                 if (!ieee80211_sdata_running(sdata))
1029                         continue;
1030                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1031                         /* If an AP vif is found, then disable PS
1032                          * by setting the count to zero thereby setting
1033                          * ps_sdata to NULL.
1034                          */
1035                         count = 0;
1036                         break;
1037                 }
1038                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1039                         continue;
1040                 found = sdata;
1041                 count++;
1042         }
1043
1044         if (count == 1 && ieee80211_powersave_allowed(found)) {
1045                 struct ieee80211_conf *conf = &local->hw.conf;
1046                 s32 beaconint_us;
1047
1048                 if (latency < 0)
1049                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1050
1051                 beaconint_us = ieee80211_tu_to_usec(
1052                                         found->vif.bss_conf.beacon_int);
1053
1054                 timeout = local->dynamic_ps_forced_timeout;
1055                 if (timeout < 0) {
1056                         /*
1057                          * Go to full PSM if the user configures a very low
1058                          * latency requirement.
1059                          * The 2000 second value is there for compatibility
1060                          * until the PM_QOS_NETWORK_LATENCY is configured
1061                          * with real values.
1062                          */
1063                         if (latency > (1900 * USEC_PER_MSEC) &&
1064                             latency != (2000 * USEC_PER_SEC))
1065                                 timeout = 0;
1066                         else
1067                                 timeout = 100;
1068                 }
1069                 local->dynamic_ps_user_timeout = timeout;
1070                 if (!local->disable_dynamic_ps)
1071                         conf->dynamic_ps_timeout =
1072                                 local->dynamic_ps_user_timeout;
1073
1074                 if (beaconint_us > latency) {
1075                         local->ps_sdata = NULL;
1076                 } else {
1077                         int maxslp = 1;
1078                         u8 dtimper = found->u.mgd.dtim_period;
1079
1080                         /* If the TIM IE is invalid, pretend the value is 1 */
1081                         if (!dtimper)
1082                                 dtimper = 1;
1083                         else if (dtimper > 1)
1084                                 maxslp = min_t(int, dtimper,
1085                                                     latency / beaconint_us);
1086
1087                         local->hw.conf.max_sleep_period = maxslp;
1088                         local->hw.conf.ps_dtim_period = dtimper;
1089                         local->ps_sdata = found;
1090                 }
1091         } else {
1092                 local->ps_sdata = NULL;
1093         }
1094
1095         ieee80211_change_ps(local);
1096 }
1097
1098 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1099 {
1100         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1101
1102         if (sdata->vif.bss_conf.ps != ps_allowed) {
1103                 sdata->vif.bss_conf.ps = ps_allowed;
1104                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1105         }
1106 }
1107
1108 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1109 {
1110         struct ieee80211_local *local =
1111                 container_of(work, struct ieee80211_local,
1112                              dynamic_ps_disable_work);
1113
1114         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1115                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1116                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1117         }
1118
1119         ieee80211_wake_queues_by_reason(&local->hw,
1120                                         IEEE80211_QUEUE_STOP_REASON_PS);
1121 }
1122
1123 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1124 {
1125         struct ieee80211_local *local =
1126                 container_of(work, struct ieee80211_local,
1127                              dynamic_ps_enable_work);
1128         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1129         struct ieee80211_if_managed *ifmgd;
1130         unsigned long flags;
1131         int q;
1132
1133         /* can only happen when PS was just disabled anyway */
1134         if (!sdata)
1135                 return;
1136
1137         ifmgd = &sdata->u.mgd;
1138
1139         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1140                 return;
1141
1142         if (!local->disable_dynamic_ps &&
1143             local->hw.conf.dynamic_ps_timeout > 0) {
1144                 /* don't enter PS if TX frames are pending */
1145                 if (drv_tx_frames_pending(local)) {
1146                         mod_timer(&local->dynamic_ps_timer, jiffies +
1147                                   msecs_to_jiffies(
1148                                   local->hw.conf.dynamic_ps_timeout));
1149                         return;
1150                 }
1151
1152                 /*
1153                  * transmission can be stopped by others which leads to
1154                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1155                  * is not the actual idle state.
1156                  */
1157                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1158                 for (q = 0; q < local->hw.queues; q++) {
1159                         if (local->queue_stop_reasons[q]) {
1160                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1161                                                        flags);
1162                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1163                                           msecs_to_jiffies(
1164                                           local->hw.conf.dynamic_ps_timeout));
1165                                 return;
1166                         }
1167                 }
1168                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1169         }
1170
1171         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1172             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1173                 netif_tx_stop_all_queues(sdata->dev);
1174
1175                 if (drv_tx_frames_pending(local))
1176                         mod_timer(&local->dynamic_ps_timer, jiffies +
1177                                   msecs_to_jiffies(
1178                                   local->hw.conf.dynamic_ps_timeout));
1179                 else {
1180                         ieee80211_send_nullfunc(local, sdata, 1);
1181                         /* Flush to get the tx status of nullfunc frame */
1182                         drv_flush(local, false);
1183                 }
1184         }
1185
1186         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1187               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1188             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1189                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1190                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1191                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1192         }
1193
1194         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1195                 netif_tx_wake_all_queues(sdata->dev);
1196 }
1197
1198 void ieee80211_dynamic_ps_timer(unsigned long data)
1199 {
1200         struct ieee80211_local *local = (void *) data;
1201
1202         if (local->quiescing || local->suspended)
1203                 return;
1204
1205         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1206 }
1207
1208 /* MLME */
1209 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1210                                      struct ieee80211_sub_if_data *sdata,
1211                                      u8 *wmm_param, size_t wmm_param_len)
1212 {
1213         struct ieee80211_tx_queue_params params;
1214         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1215         size_t left;
1216         int count;
1217         u8 *pos, uapsd_queues = 0;
1218
1219         if (!local->ops->conf_tx)
1220                 return false;
1221
1222         if (local->hw.queues < IEEE80211_NUM_ACS)
1223                 return false;
1224
1225         if (!wmm_param)
1226                 return false;
1227
1228         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1229                 return false;
1230
1231         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1232                 uapsd_queues = ifmgd->uapsd_queues;
1233
1234         count = wmm_param[6] & 0x0f;
1235         if (count == ifmgd->wmm_last_param_set)
1236                 return false;
1237         ifmgd->wmm_last_param_set = count;
1238
1239         pos = wmm_param + 8;
1240         left = wmm_param_len - 8;
1241
1242         memset(&params, 0, sizeof(params));
1243
1244         sdata->wmm_acm = 0;
1245         for (; left >= 4; left -= 4, pos += 4) {
1246                 int aci = (pos[0] >> 5) & 0x03;
1247                 int acm = (pos[0] >> 4) & 0x01;
1248                 bool uapsd = false;
1249                 int queue;
1250
1251                 switch (aci) {
1252                 case 1: /* AC_BK */
1253                         queue = 3;
1254                         if (acm)
1255                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1256                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1257                                 uapsd = true;
1258                         break;
1259                 case 2: /* AC_VI */
1260                         queue = 1;
1261                         if (acm)
1262                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1263                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1264                                 uapsd = true;
1265                         break;
1266                 case 3: /* AC_VO */
1267                         queue = 0;
1268                         if (acm)
1269                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1270                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1271                                 uapsd = true;
1272                         break;
1273                 case 0: /* AC_BE */
1274                 default:
1275                         queue = 2;
1276                         if (acm)
1277                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1278                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1279                                 uapsd = true;
1280                         break;
1281                 }
1282
1283                 params.aifs = pos[0] & 0x0f;
1284                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1285                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1286                 params.txop = get_unaligned_le16(pos + 2);
1287                 params.uapsd = uapsd;
1288
1289                 mlme_dbg(sdata,
1290                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1291                          queue, aci, acm,
1292                          params.aifs, params.cw_min, params.cw_max,
1293                          params.txop, params.uapsd);
1294                 sdata->tx_conf[queue] = params;
1295                 if (drv_conf_tx(local, sdata, queue, &params))
1296                         sdata_err(sdata,
1297                                   "failed to set TX queue parameters for queue %d\n",
1298                                   queue);
1299         }
1300
1301         /* enable WMM or activate new settings */
1302         sdata->vif.bss_conf.qos = true;
1303         return true;
1304 }
1305
1306 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1307 {
1308         lockdep_assert_held(&sdata->local->mtx);
1309
1310         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1311                                 IEEE80211_STA_BEACON_POLL);
1312         ieee80211_run_deferred_scan(sdata->local);
1313 }
1314
1315 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1316 {
1317         mutex_lock(&sdata->local->mtx);
1318         __ieee80211_stop_poll(sdata);
1319         mutex_unlock(&sdata->local->mtx);
1320 }
1321
1322 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1323                                            u16 capab, bool erp_valid, u8 erp)
1324 {
1325         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1326         u32 changed = 0;
1327         bool use_protection;
1328         bool use_short_preamble;
1329         bool use_short_slot;
1330
1331         if (erp_valid) {
1332                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1333                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1334         } else {
1335                 use_protection = false;
1336                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1337         }
1338
1339         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1340         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1341                 use_short_slot = true;
1342
1343         if (use_protection != bss_conf->use_cts_prot) {
1344                 bss_conf->use_cts_prot = use_protection;
1345                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1346         }
1347
1348         if (use_short_preamble != bss_conf->use_short_preamble) {
1349                 bss_conf->use_short_preamble = use_short_preamble;
1350                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1351         }
1352
1353         if (use_short_slot != bss_conf->use_short_slot) {
1354                 bss_conf->use_short_slot = use_short_slot;
1355                 changed |= BSS_CHANGED_ERP_SLOT;
1356         }
1357
1358         return changed;
1359 }
1360
1361 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1362                                      struct cfg80211_bss *cbss,
1363                                      u32 bss_info_changed)
1364 {
1365         struct ieee80211_bss *bss = (void *)cbss->priv;
1366         struct ieee80211_local *local = sdata->local;
1367         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1368
1369         bss_info_changed |= BSS_CHANGED_ASSOC;
1370         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1371                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1372
1373         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1374                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1375
1376         sdata->u.mgd.associated = cbss;
1377         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1378
1379         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1380
1381         if (sdata->vif.p2p) {
1382                 const struct cfg80211_bss_ies *ies;
1383
1384                 rcu_read_lock();
1385                 ies = rcu_dereference(cbss->ies);
1386                 if (ies) {
1387                         u8 noa[2];
1388                         int ret;
1389
1390                         ret = cfg80211_get_p2p_attr(
1391                                         ies->data, ies->len,
1392                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1393                                         noa, sizeof(noa));
1394                         if (ret >= 2) {
1395                                 bss_conf->p2p_oppps = noa[1] & 0x80;
1396                                 bss_conf->p2p_ctwindow = noa[1] & 0x7f;
1397                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1398                                 sdata->u.mgd.p2p_noa_index = noa[0];
1399                         }
1400                 }
1401                 rcu_read_unlock();
1402         }
1403
1404         /* just to be sure */
1405         ieee80211_stop_poll(sdata);
1406
1407         ieee80211_led_assoc(local, 1);
1408
1409         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
1410                 /*
1411                  * If the AP is buggy we may get here with no DTIM period
1412                  * known, so assume it's 1 which is the only safe assumption
1413                  * in that case, although if the TIM IE is broken powersave
1414                  * probably just won't work at all.
1415                  */
1416                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1417         } else {
1418                 bss_conf->dtim_period = 0;
1419         }
1420
1421         bss_conf->assoc = 1;
1422
1423         /* Tell the driver to monitor connection quality (if supported) */
1424         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1425             bss_conf->cqm_rssi_thold)
1426                 bss_info_changed |= BSS_CHANGED_CQM;
1427
1428         /* Enable ARP filtering */
1429         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1430                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1431                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1432         }
1433
1434         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1435
1436         mutex_lock(&local->iflist_mtx);
1437         ieee80211_recalc_ps(local, -1);
1438         mutex_unlock(&local->iflist_mtx);
1439
1440         ieee80211_recalc_smps(sdata);
1441         ieee80211_recalc_ps_vif(sdata);
1442
1443         netif_tx_start_all_queues(sdata->dev);
1444         netif_carrier_on(sdata->dev);
1445 }
1446
1447 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1448                                    u16 stype, u16 reason, bool tx,
1449                                    u8 *frame_buf)
1450 {
1451         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1452         struct ieee80211_local *local = sdata->local;
1453         struct sta_info *sta;
1454         u32 changed = 0;
1455
1456         ASSERT_MGD_MTX(ifmgd);
1457
1458         if (WARN_ON_ONCE(tx && !frame_buf))
1459                 return;
1460
1461         if (WARN_ON(!ifmgd->associated))
1462                 return;
1463
1464         ieee80211_stop_poll(sdata);
1465
1466         ifmgd->associated = NULL;
1467
1468         /*
1469          * we need to commit the associated = NULL change because the
1470          * scan code uses that to determine whether this iface should
1471          * go to/wake up from powersave or not -- and could otherwise
1472          * wake the queues erroneously.
1473          */
1474         smp_mb();
1475
1476         /*
1477          * Thus, we can only afterwards stop the queues -- to account
1478          * for the case where another CPU is finishing a scan at this
1479          * time -- we don't want the scan code to enable queues.
1480          */
1481
1482         netif_tx_stop_all_queues(sdata->dev);
1483         netif_carrier_off(sdata->dev);
1484
1485         mutex_lock(&local->sta_mtx);
1486         sta = sta_info_get(sdata, ifmgd->bssid);
1487         if (sta) {
1488                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1489                 ieee80211_sta_tear_down_BA_sessions(sta, false);
1490         }
1491         mutex_unlock(&local->sta_mtx);
1492
1493         /*
1494          * if we want to get out of ps before disassoc (why?) we have
1495          * to do it before sending disassoc, as otherwise the null-packet
1496          * won't be valid.
1497          */
1498         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1499                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1500                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1501         }
1502         local->ps_sdata = NULL;
1503
1504         /* disable per-vif ps */
1505         ieee80211_recalc_ps_vif(sdata);
1506
1507         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1508         if (tx)
1509                 drv_flush(local, false);
1510
1511         /* deauthenticate/disassociate now */
1512         if (tx || frame_buf)
1513                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1514                                                reason, tx, frame_buf);
1515
1516         /* flush out frame */
1517         if (tx)
1518                 drv_flush(local, false);
1519
1520         /* clear bssid only after building the needed mgmt frames */
1521         memset(ifmgd->bssid, 0, ETH_ALEN);
1522
1523         /* remove AP and TDLS peers */
1524         sta_info_flush(local, sdata);
1525
1526         /* finally reset all BSS / config parameters */
1527         changed |= ieee80211_reset_erp_info(sdata);
1528
1529         ieee80211_led_assoc(local, 0);
1530         changed |= BSS_CHANGED_ASSOC;
1531         sdata->vif.bss_conf.assoc = false;
1532
1533         sdata->vif.bss_conf.p2p_ctwindow = 0;
1534         sdata->vif.bss_conf.p2p_oppps = false;
1535
1536         /* on the next assoc, re-program HT parameters */
1537         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1538         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1539
1540         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1541
1542         del_timer_sync(&local->dynamic_ps_timer);
1543         cancel_work_sync(&local->dynamic_ps_enable_work);
1544
1545         /* Disable ARP filtering */
1546         if (sdata->vif.bss_conf.arp_filter_enabled) {
1547                 sdata->vif.bss_conf.arp_filter_enabled = false;
1548                 changed |= BSS_CHANGED_ARP_FILTER;
1549         }
1550
1551         sdata->vif.bss_conf.qos = false;
1552         changed |= BSS_CHANGED_QOS;
1553
1554         /* The BSSID (not really interesting) and HT changed */
1555         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1556         ieee80211_bss_info_change_notify(sdata, changed);
1557
1558         /* disassociated - set to defaults now */
1559         ieee80211_set_wmm_default(sdata, false);
1560
1561         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1562         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1563         del_timer_sync(&sdata->u.mgd.timer);
1564         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1565
1566         sdata->u.mgd.timers_running = 0;
1567
1568         sdata->vif.bss_conf.dtim_period = 0;
1569
1570         ifmgd->flags = 0;
1571         ieee80211_vif_release_channel(sdata);
1572 }
1573
1574 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1575                              struct ieee80211_hdr *hdr)
1576 {
1577         /*
1578          * We can postpone the mgd.timer whenever receiving unicast frames
1579          * from AP because we know that the connection is working both ways
1580          * at that time. But multicast frames (and hence also beacons) must
1581          * be ignored here, because we need to trigger the timer during
1582          * data idle periods for sending the periodic probe request to the
1583          * AP we're connected to.
1584          */
1585         if (is_multicast_ether_addr(hdr->addr1))
1586                 return;
1587
1588         ieee80211_sta_reset_conn_monitor(sdata);
1589 }
1590
1591 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1592 {
1593         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1594         struct ieee80211_local *local = sdata->local;
1595
1596         mutex_lock(&local->mtx);
1597         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1598                               IEEE80211_STA_CONNECTION_POLL))) {
1599                 mutex_unlock(&local->mtx);
1600                 return;
1601         }
1602
1603         __ieee80211_stop_poll(sdata);
1604
1605         mutex_lock(&local->iflist_mtx);
1606         ieee80211_recalc_ps(local, -1);
1607         mutex_unlock(&local->iflist_mtx);
1608
1609         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1610                 goto out;
1611
1612         /*
1613          * We've received a probe response, but are not sure whether
1614          * we have or will be receiving any beacons or data, so let's
1615          * schedule the timers again, just in case.
1616          */
1617         ieee80211_sta_reset_beacon_monitor(sdata);
1618
1619         mod_timer(&ifmgd->conn_mon_timer,
1620                   round_jiffies_up(jiffies +
1621                                    IEEE80211_CONNECTION_IDLE_TIME));
1622 out:
1623         mutex_unlock(&local->mtx);
1624 }
1625
1626 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1627                              struct ieee80211_hdr *hdr, bool ack)
1628 {
1629         if (!ieee80211_is_data(hdr->frame_control))
1630             return;
1631
1632         if (ack)
1633                 ieee80211_sta_reset_conn_monitor(sdata);
1634
1635         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1636             sdata->u.mgd.probe_send_count > 0) {
1637                 if (ack)
1638                         sdata->u.mgd.probe_send_count = 0;
1639                 else
1640                         sdata->u.mgd.nullfunc_failed = true;
1641                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1642         }
1643 }
1644
1645 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1646 {
1647         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1648         const u8 *ssid;
1649         u8 *dst = ifmgd->associated->bssid;
1650         u8 unicast_limit = max(1, max_probe_tries - 3);
1651
1652         /*
1653          * Try sending broadcast probe requests for the last three
1654          * probe requests after the first ones failed since some
1655          * buggy APs only support broadcast probe requests.
1656          */
1657         if (ifmgd->probe_send_count >= unicast_limit)
1658                 dst = NULL;
1659
1660         /*
1661          * When the hardware reports an accurate Tx ACK status, it's
1662          * better to send a nullfunc frame instead of a probe request,
1663          * as it will kick us off the AP quickly if we aren't associated
1664          * anymore. The timeout will be reset if the frame is ACKed by
1665          * the AP.
1666          */
1667         ifmgd->probe_send_count++;
1668
1669         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1670                 ifmgd->nullfunc_failed = false;
1671                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1672         } else {
1673                 int ssid_len;
1674
1675                 rcu_read_lock();
1676                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1677                 if (WARN_ON_ONCE(ssid == NULL))
1678                         ssid_len = 0;
1679                 else
1680                         ssid_len = ssid[1];
1681
1682                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1683                                          0, (u32) -1, true, false,
1684                                          ifmgd->associated->channel, false);
1685                 rcu_read_unlock();
1686         }
1687
1688         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1689         run_again(ifmgd, ifmgd->probe_timeout);
1690         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1691                 drv_flush(sdata->local, false);
1692 }
1693
1694 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1695                                    bool beacon)
1696 {
1697         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1698         bool already = false;
1699
1700         if (!ieee80211_sdata_running(sdata))
1701                 return;
1702
1703         mutex_lock(&ifmgd->mtx);
1704
1705         if (!ifmgd->associated)
1706                 goto out;
1707
1708         mutex_lock(&sdata->local->mtx);
1709
1710         if (sdata->local->tmp_channel || sdata->local->scanning) {
1711                 mutex_unlock(&sdata->local->mtx);
1712                 goto out;
1713         }
1714
1715         if (beacon)
1716                 mlme_dbg_ratelimited(sdata,
1717                                      "detected beacon loss from AP - sending probe request\n");
1718
1719         ieee80211_cqm_rssi_notify(&sdata->vif,
1720                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1721
1722         /*
1723          * The driver/our work has already reported this event or the
1724          * connection monitoring has kicked in and we have already sent
1725          * a probe request. Or maybe the AP died and the driver keeps
1726          * reporting until we disassociate...
1727          *
1728          * In either case we have to ignore the current call to this
1729          * function (except for setting the correct probe reason bit)
1730          * because otherwise we would reset the timer every time and
1731          * never check whether we received a probe response!
1732          */
1733         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1734                             IEEE80211_STA_CONNECTION_POLL))
1735                 already = true;
1736
1737         if (beacon)
1738                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1739         else
1740                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1741
1742         mutex_unlock(&sdata->local->mtx);
1743
1744         if (already)
1745                 goto out;
1746
1747         mutex_lock(&sdata->local->iflist_mtx);
1748         ieee80211_recalc_ps(sdata->local, -1);
1749         mutex_unlock(&sdata->local->iflist_mtx);
1750
1751         ifmgd->probe_send_count = 0;
1752         ieee80211_mgd_probe_ap_send(sdata);
1753  out:
1754         mutex_unlock(&ifmgd->mtx);
1755 }
1756
1757 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1758                                           struct ieee80211_vif *vif)
1759 {
1760         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1761         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1762         struct cfg80211_bss *cbss;
1763         struct sk_buff *skb;
1764         const u8 *ssid;
1765         int ssid_len;
1766
1767         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1768                 return NULL;
1769
1770         ASSERT_MGD_MTX(ifmgd);
1771
1772         if (ifmgd->associated)
1773                 cbss = ifmgd->associated;
1774         else if (ifmgd->auth_data)
1775                 cbss = ifmgd->auth_data->bss;
1776         else if (ifmgd->assoc_data)
1777                 cbss = ifmgd->assoc_data->bss;
1778         else
1779                 return NULL;
1780
1781         rcu_read_lock();
1782         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1783         if (WARN_ON_ONCE(ssid == NULL))
1784                 ssid_len = 0;
1785         else
1786                 ssid_len = ssid[1];
1787
1788         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1789                                         (u32) -1, cbss->channel,
1790                                         ssid + 2, ssid_len,
1791                                         NULL, 0, true);
1792         rcu_read_unlock();
1793
1794         return skb;
1795 }
1796 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1797
1798 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata,
1799                                    bool transmit_frame)
1800 {
1801         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1802         struct ieee80211_local *local = sdata->local;
1803         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1804
1805         mutex_lock(&ifmgd->mtx);
1806         if (!ifmgd->associated) {
1807                 mutex_unlock(&ifmgd->mtx);
1808                 return;
1809         }
1810
1811         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1812                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1813                                transmit_frame, frame_buf);
1814         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1815         mutex_unlock(&ifmgd->mtx);
1816
1817         /*
1818          * must be outside lock due to cfg80211,
1819          * but that's not a problem.
1820          */
1821         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
1822
1823         mutex_lock(&local->mtx);
1824         ieee80211_recalc_idle(local);
1825         mutex_unlock(&local->mtx);
1826 }
1827
1828 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1829 {
1830         struct ieee80211_sub_if_data *sdata =
1831                 container_of(work, struct ieee80211_sub_if_data,
1832                              u.mgd.beacon_connection_loss_work);
1833         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1834         struct sta_info *sta;
1835
1836         if (ifmgd->associated) {
1837                 rcu_read_lock();
1838                 sta = sta_info_get(sdata, ifmgd->bssid);
1839                 if (sta)
1840                         sta->beacon_loss_count++;
1841                 rcu_read_unlock();
1842         }
1843
1844         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) {
1845                 sdata_info(sdata, "Connection to AP %pM lost\n",
1846                            ifmgd->bssid);
1847                 __ieee80211_disconnect(sdata, false);
1848         } else {
1849                 ieee80211_mgd_probe_ap(sdata, true);
1850         }
1851 }
1852
1853 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
1854 {
1855         struct ieee80211_sub_if_data *sdata =
1856                 container_of(work, struct ieee80211_sub_if_data,
1857                              u.mgd.csa_connection_drop_work);
1858
1859         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1860                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1861         __ieee80211_disconnect(sdata, true);
1862 }
1863
1864 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1865 {
1866         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1867         struct ieee80211_hw *hw = &sdata->local->hw;
1868
1869         trace_api_beacon_loss(sdata);
1870
1871         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1872         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1873 }
1874 EXPORT_SYMBOL(ieee80211_beacon_loss);
1875
1876 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1877 {
1878         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1879         struct ieee80211_hw *hw = &sdata->local->hw;
1880
1881         trace_api_connection_loss(sdata);
1882
1883         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1884         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1885 }
1886 EXPORT_SYMBOL(ieee80211_connection_loss);
1887
1888
1889 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1890                                         bool assoc)
1891 {
1892         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1893
1894         lockdep_assert_held(&sdata->u.mgd.mtx);
1895
1896         if (!assoc) {
1897                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1898
1899                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1900                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1901                 sdata->u.mgd.flags = 0;
1902                 ieee80211_vif_release_channel(sdata);
1903         }
1904
1905         cfg80211_put_bss(auth_data->bss);
1906         kfree(auth_data);
1907         sdata->u.mgd.auth_data = NULL;
1908 }
1909
1910 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1911                                      struct ieee80211_mgmt *mgmt, size_t len)
1912 {
1913         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1914         u8 *pos;
1915         struct ieee802_11_elems elems;
1916
1917         pos = mgmt->u.auth.variable;
1918         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1919         if (!elems.challenge)
1920                 return;
1921         auth_data->expected_transaction = 4;
1922         drv_mgd_prepare_tx(sdata->local, sdata);
1923         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
1924                             elems.challenge - 2, elems.challenge_len + 2,
1925                             auth_data->bss->bssid, auth_data->bss->bssid,
1926                             auth_data->key, auth_data->key_len,
1927                             auth_data->key_idx);
1928 }
1929
1930 static enum rx_mgmt_action __must_check
1931 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1932                        struct ieee80211_mgmt *mgmt, size_t len)
1933 {
1934         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1935         u8 bssid[ETH_ALEN];
1936         u16 auth_alg, auth_transaction, status_code;
1937         struct sta_info *sta;
1938
1939         lockdep_assert_held(&ifmgd->mtx);
1940
1941         if (len < 24 + 6)
1942                 return RX_MGMT_NONE;
1943
1944         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1945                 return RX_MGMT_NONE;
1946
1947         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1948
1949         if (!ether_addr_equal(bssid, mgmt->bssid))
1950                 return RX_MGMT_NONE;
1951
1952         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1953         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1954         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1955
1956         if (auth_alg != ifmgd->auth_data->algorithm ||
1957             auth_transaction != ifmgd->auth_data->expected_transaction) {
1958                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
1959                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
1960                            auth_transaction,
1961                            ifmgd->auth_data->expected_transaction);
1962                 return RX_MGMT_NONE;
1963         }
1964
1965         if (status_code != WLAN_STATUS_SUCCESS) {
1966                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1967                            mgmt->sa, status_code);
1968                 ieee80211_destroy_auth_data(sdata, false);
1969                 return RX_MGMT_CFG80211_RX_AUTH;
1970         }
1971
1972         switch (ifmgd->auth_data->algorithm) {
1973         case WLAN_AUTH_OPEN:
1974         case WLAN_AUTH_LEAP:
1975         case WLAN_AUTH_FT:
1976         case WLAN_AUTH_SAE:
1977                 break;
1978         case WLAN_AUTH_SHARED_KEY:
1979                 if (ifmgd->auth_data->expected_transaction != 4) {
1980                         ieee80211_auth_challenge(sdata, mgmt, len);
1981                         /* need another frame */
1982                         return RX_MGMT_NONE;
1983                 }
1984                 break;
1985         default:
1986                 WARN_ONCE(1, "invalid auth alg %d",
1987                           ifmgd->auth_data->algorithm);
1988                 return RX_MGMT_NONE;
1989         }
1990
1991         sdata_info(sdata, "authenticated\n");
1992         ifmgd->auth_data->done = true;
1993         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1994         run_again(ifmgd, ifmgd->auth_data->timeout);
1995
1996         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
1997             ifmgd->auth_data->expected_transaction != 2) {
1998                 /*
1999                  * Report auth frame to user space for processing since another
2000                  * round of Authentication frames is still needed.
2001                  */
2002                 return RX_MGMT_CFG80211_RX_AUTH;
2003         }
2004
2005         /* move station state to auth */
2006         mutex_lock(&sdata->local->sta_mtx);
2007         sta = sta_info_get(sdata, bssid);
2008         if (!sta) {
2009                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2010                 goto out_err;
2011         }
2012         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2013                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2014                 goto out_err;
2015         }
2016         mutex_unlock(&sdata->local->sta_mtx);
2017
2018         return RX_MGMT_CFG80211_RX_AUTH;
2019  out_err:
2020         mutex_unlock(&sdata->local->sta_mtx);
2021         /* ignore frame -- wait for timeout */
2022         return RX_MGMT_NONE;
2023 }
2024
2025
2026 static enum rx_mgmt_action __must_check
2027 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2028                          struct ieee80211_mgmt *mgmt, size_t len)
2029 {
2030         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2031         const u8 *bssid = NULL;
2032         u16 reason_code;
2033
2034         lockdep_assert_held(&ifmgd->mtx);
2035
2036         if (len < 24 + 2)
2037                 return RX_MGMT_NONE;
2038
2039         if (!ifmgd->associated ||
2040             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2041                 return RX_MGMT_NONE;
2042
2043         bssid = ifmgd->associated->bssid;
2044
2045         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2046
2047         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2048                    bssid, reason_code);
2049
2050         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2051
2052         mutex_lock(&sdata->local->mtx);
2053         ieee80211_recalc_idle(sdata->local);
2054         mutex_unlock(&sdata->local->mtx);
2055
2056         return RX_MGMT_CFG80211_DEAUTH;
2057 }
2058
2059
2060 static enum rx_mgmt_action __must_check
2061 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2062                            struct ieee80211_mgmt *mgmt, size_t len)
2063 {
2064         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2065         u16 reason_code;
2066
2067         lockdep_assert_held(&ifmgd->mtx);
2068
2069         if (len < 24 + 2)
2070                 return RX_MGMT_NONE;
2071
2072         if (!ifmgd->associated ||
2073             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2074                 return RX_MGMT_NONE;
2075
2076         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2077
2078         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2079                    mgmt->sa, reason_code);
2080
2081         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2082
2083         mutex_lock(&sdata->local->mtx);
2084         ieee80211_recalc_idle(sdata->local);
2085         mutex_unlock(&sdata->local->mtx);
2086
2087         return RX_MGMT_CFG80211_DISASSOC;
2088 }
2089
2090 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2091                                 u8 *supp_rates, unsigned int supp_rates_len,
2092                                 u32 *rates, u32 *basic_rates,
2093                                 bool *have_higher_than_11mbit,
2094                                 int *min_rate, int *min_rate_index)
2095 {
2096         int i, j;
2097
2098         for (i = 0; i < supp_rates_len; i++) {
2099                 int rate = (supp_rates[i] & 0x7f) * 5;
2100                 bool is_basic = !!(supp_rates[i] & 0x80);
2101
2102                 if (rate > 110)
2103                         *have_higher_than_11mbit = true;
2104
2105                 /*
2106                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2107                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2108                  *
2109                  * Note: Even through the membership selector and the basic
2110                  *       rate flag share the same bit, they are not exactly
2111                  *       the same.
2112                  */
2113                 if (!!(supp_rates[i] & 0x80) &&
2114                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2115                         continue;
2116
2117                 for (j = 0; j < sband->n_bitrates; j++) {
2118                         if (sband->bitrates[j].bitrate == rate) {
2119                                 *rates |= BIT(j);
2120                                 if (is_basic)
2121                                         *basic_rates |= BIT(j);
2122                                 if (rate < *min_rate) {
2123                                         *min_rate = rate;
2124                                         *min_rate_index = j;
2125                                 }
2126                                 break;
2127                         }
2128                 }
2129         }
2130 }
2131
2132 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2133                                          bool assoc)
2134 {
2135         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2136
2137         lockdep_assert_held(&sdata->u.mgd.mtx);
2138
2139         if (!assoc) {
2140                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2141
2142                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2143                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2144                 sdata->u.mgd.flags = 0;
2145                 ieee80211_vif_release_channel(sdata);
2146         }
2147
2148         kfree(assoc_data);
2149         sdata->u.mgd.assoc_data = NULL;
2150 }
2151
2152 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2153                                     struct cfg80211_bss *cbss,
2154                                     struct ieee80211_mgmt *mgmt, size_t len)
2155 {
2156         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2157         struct ieee80211_local *local = sdata->local;
2158         struct ieee80211_supported_band *sband;
2159         struct sta_info *sta;
2160         u8 *pos;
2161         u16 capab_info, aid;
2162         struct ieee802_11_elems elems;
2163         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2164         u32 changed = 0;
2165         int err;
2166
2167         /* AssocResp and ReassocResp have identical structure */
2168
2169         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2170         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2171
2172         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2173                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2174                            aid);
2175         aid &= ~(BIT(15) | BIT(14));
2176
2177         ifmgd->broken_ap = false;
2178
2179         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2180                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2181                            aid);
2182                 aid = 0;
2183                 ifmgd->broken_ap = true;
2184         }
2185
2186         pos = mgmt->u.assoc_resp.variable;
2187         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2188
2189         if (!elems.supp_rates) {
2190                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2191                 return false;
2192         }
2193
2194         ifmgd->aid = aid;
2195
2196         mutex_lock(&sdata->local->sta_mtx);
2197         /*
2198          * station info was already allocated and inserted before
2199          * the association and should be available to us
2200          */
2201         sta = sta_info_get(sdata, cbss->bssid);
2202         if (WARN_ON(!sta)) {
2203                 mutex_unlock(&sdata->local->sta_mtx);
2204                 return false;
2205         }
2206
2207         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2208
2209         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2210                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2211                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2212
2213         sta->supports_40mhz =
2214                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2215
2216         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2217                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2218                                                     elems.vht_cap_elem,
2219                                                     &sta->sta.vht_cap);
2220
2221         rate_control_rate_init(sta);
2222
2223         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2224                 set_sta_flag(sta, WLAN_STA_MFP);
2225
2226         if (elems.wmm_param)
2227                 set_sta_flag(sta, WLAN_STA_WME);
2228
2229         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2230         if (!err)
2231                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2232         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2233                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2234         if (err) {
2235                 sdata_info(sdata,
2236                            "failed to move station %pM to desired state\n",
2237                            sta->sta.addr);
2238                 WARN_ON(__sta_info_destroy(sta));
2239                 mutex_unlock(&sdata->local->sta_mtx);
2240                 return false;
2241         }
2242
2243         mutex_unlock(&sdata->local->sta_mtx);
2244
2245         /*
2246          * Always handle WMM once after association regardless
2247          * of the first value the AP uses. Setting -1 here has
2248          * that effect because the AP values is an unsigned
2249          * 4-bit value.
2250          */
2251         ifmgd->wmm_last_param_set = -1;
2252
2253         if (elems.wmm_param)
2254                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2255                                          elems.wmm_param_len);
2256         else
2257                 ieee80211_set_wmm_default(sdata, false);
2258         changed |= BSS_CHANGED_QOS;
2259
2260         if (elems.ht_operation && elems.wmm_param &&
2261             !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2262                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2263                                                   cbss->bssid, false);
2264
2265         /* set AID and assoc capability,
2266          * ieee80211_set_associated() will tell the driver */
2267         bss_conf->aid = aid;
2268         bss_conf->assoc_capability = capab_info;
2269         ieee80211_set_associated(sdata, cbss, changed);
2270
2271         /*
2272          * If we're using 4-addr mode, let the AP know that we're
2273          * doing so, so that it can create the STA VLAN on its side
2274          */
2275         if (ifmgd->use_4addr)
2276                 ieee80211_send_4addr_nullfunc(local, sdata);
2277
2278         /*
2279          * Start timer to probe the connection to the AP now.
2280          * Also start the timer that will detect beacon loss.
2281          */
2282         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2283         ieee80211_sta_reset_beacon_monitor(sdata);
2284
2285         return true;
2286 }
2287
2288 static enum rx_mgmt_action __must_check
2289 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2290                              struct ieee80211_mgmt *mgmt, size_t len,
2291                              struct cfg80211_bss **bss)
2292 {
2293         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2294         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2295         u16 capab_info, status_code, aid;
2296         struct ieee802_11_elems elems;
2297         u8 *pos;
2298         bool reassoc;
2299
2300         lockdep_assert_held(&ifmgd->mtx);
2301
2302         if (!assoc_data)
2303                 return RX_MGMT_NONE;
2304         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2305                 return RX_MGMT_NONE;
2306
2307         /*
2308          * AssocResp and ReassocResp have identical structure, so process both
2309          * of them in this function.
2310          */
2311
2312         if (len < 24 + 6)
2313                 return RX_MGMT_NONE;
2314
2315         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2316         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2317         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2318         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2319
2320         sdata_info(sdata,
2321                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2322                    reassoc ? "Rea" : "A", mgmt->sa,
2323                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2324
2325         pos = mgmt->u.assoc_resp.variable;
2326         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2327
2328         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2329             elems.timeout_int && elems.timeout_int_len == 5 &&
2330             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2331                 u32 tu, ms;
2332                 tu = get_unaligned_le32(elems.timeout_int + 1);
2333                 ms = tu * 1024 / 1000;
2334                 sdata_info(sdata,
2335                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2336                            mgmt->sa, tu, ms);
2337                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2338                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2339                         run_again(ifmgd, assoc_data->timeout);
2340                 return RX_MGMT_NONE;
2341         }
2342
2343         *bss = assoc_data->bss;
2344
2345         if (status_code != WLAN_STATUS_SUCCESS) {
2346                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2347                            mgmt->sa, status_code);
2348                 ieee80211_destroy_assoc_data(sdata, false);
2349         } else {
2350                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2351                         /* oops -- internal error -- send timeout for now */
2352                         ieee80211_destroy_assoc_data(sdata, false);
2353                         cfg80211_put_bss(*bss);
2354                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2355                 }
2356                 sdata_info(sdata, "associated\n");
2357
2358                 /*
2359                  * destroy assoc_data afterwards, as otherwise an idle
2360                  * recalc after assoc_data is NULL but before associated
2361                  * is set can cause the interface to go idle
2362                  */
2363                 ieee80211_destroy_assoc_data(sdata, true);
2364         }
2365
2366         return RX_MGMT_CFG80211_RX_ASSOC;
2367 }
2368
2369 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2370                                   struct ieee80211_mgmt *mgmt, size_t len,
2371                                   struct ieee80211_rx_status *rx_status,
2372                                   struct ieee802_11_elems *elems,
2373                                   bool beacon)
2374 {
2375         struct ieee80211_local *local = sdata->local;
2376         int freq;
2377         struct ieee80211_bss *bss;
2378         struct ieee80211_channel *channel;
2379         bool need_ps = false;
2380
2381         if ((sdata->u.mgd.associated &&
2382              ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) ||
2383             (sdata->u.mgd.assoc_data &&
2384              ether_addr_equal(mgmt->bssid,
2385                               sdata->u.mgd.assoc_data->bss->bssid))) {
2386                 /* not previously set so we may need to recalc */
2387                 need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period;
2388
2389                 if (elems->tim && !elems->parse_error) {
2390                         struct ieee80211_tim_ie *tim_ie = elems->tim;
2391                         sdata->u.mgd.dtim_period = tim_ie->dtim_period;
2392                 }
2393         }
2394
2395         if (elems->ds_params && elems->ds_params_len == 1)
2396                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2397                                                       rx_status->band);
2398         else
2399                 freq = rx_status->freq;
2400
2401         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2402
2403         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2404                 return;
2405
2406         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2407                                         channel, beacon);
2408         if (bss)
2409                 ieee80211_rx_bss_put(local, bss);
2410
2411         if (!sdata->u.mgd.associated)
2412                 return;
2413
2414         if (need_ps) {
2415                 mutex_lock(&local->iflist_mtx);
2416                 ieee80211_recalc_ps(local, -1);
2417                 mutex_unlock(&local->iflist_mtx);
2418         }
2419
2420         if (elems->ch_switch_ie &&
2421             memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2422                 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2423                                                  bss, rx_status->mactime);
2424 }
2425
2426
2427 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2428                                          struct sk_buff *skb)
2429 {
2430         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2431         struct ieee80211_if_managed *ifmgd;
2432         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2433         size_t baselen, len = skb->len;
2434         struct ieee802_11_elems elems;
2435
2436         ifmgd = &sdata->u.mgd;
2437
2438         ASSERT_MGD_MTX(ifmgd);
2439
2440         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2441                 return; /* ignore ProbeResp to foreign address */
2442
2443         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2444         if (baselen > len)
2445                 return;
2446
2447         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2448                                 &elems);
2449
2450         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2451
2452         if (ifmgd->associated &&
2453             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2454                 ieee80211_reset_ap_probe(sdata);
2455
2456         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2457             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2458                 /* got probe response, continue with auth */
2459                 sdata_info(sdata, "direct probe responded\n");
2460                 ifmgd->auth_data->tries = 0;
2461                 ifmgd->auth_data->timeout = jiffies;
2462                 run_again(ifmgd, ifmgd->auth_data->timeout);
2463         }
2464 }
2465
2466 /*
2467  * This is the canonical list of information elements we care about,
2468  * the filter code also gives us all changes to the Microsoft OUI
2469  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2470  *
2471  * We implement beacon filtering in software since that means we can
2472  * avoid processing the frame here and in cfg80211, and userspace
2473  * will not be able to tell whether the hardware supports it or not.
2474  *
2475  * XXX: This list needs to be dynamic -- userspace needs to be able to
2476  *      add items it requires. It also needs to be able to tell us to
2477  *      look out for other vendor IEs.
2478  */
2479 static const u64 care_about_ies =
2480         (1ULL << WLAN_EID_COUNTRY) |
2481         (1ULL << WLAN_EID_ERP_INFO) |
2482         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2483         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2484         (1ULL << WLAN_EID_HT_CAPABILITY) |
2485         (1ULL << WLAN_EID_HT_OPERATION);
2486
2487 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2488                                      struct ieee80211_mgmt *mgmt,
2489                                      size_t len,
2490                                      struct ieee80211_rx_status *rx_status)
2491 {
2492         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2493         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2494         size_t baselen;
2495         struct ieee802_11_elems elems;
2496         struct ieee80211_local *local = sdata->local;
2497         struct ieee80211_chanctx_conf *chanctx_conf;
2498         struct ieee80211_channel *chan;
2499         u32 changed = 0;
2500         bool erp_valid;
2501         u8 erp_value = 0;
2502         u32 ncrc;
2503         u8 *bssid;
2504
2505         lockdep_assert_held(&ifmgd->mtx);
2506
2507         /* Process beacon from the current BSS */
2508         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2509         if (baselen > len)
2510                 return;
2511
2512         rcu_read_lock();
2513         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2514         if (!chanctx_conf) {
2515                 rcu_read_unlock();
2516                 return;
2517         }
2518
2519         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2520                 rcu_read_unlock();
2521                 return;
2522         }
2523         chan = chanctx_conf->def.chan;
2524         rcu_read_unlock();
2525
2526         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2527             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2528                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2529                                        len - baselen, &elems);
2530
2531                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2532                                       false);
2533                 ifmgd->assoc_data->have_beacon = true;
2534                 ifmgd->assoc_data->sent_assoc = false;
2535                 /* continue assoc process */
2536                 ifmgd->assoc_data->timeout = jiffies;
2537                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2538                 return;
2539         }
2540
2541         if (!ifmgd->associated ||
2542             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2543                 return;
2544         bssid = ifmgd->associated->bssid;
2545
2546         /* Track average RSSI from the Beacon frames of the current AP */
2547         ifmgd->last_beacon_signal = rx_status->signal;
2548         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2549                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2550                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2551                 ifmgd->last_cqm_event_signal = 0;
2552                 ifmgd->count_beacon_signal = 1;
2553                 ifmgd->last_ave_beacon_signal = 0;
2554         } else {
2555                 ifmgd->ave_beacon_signal =
2556                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2557                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2558                          ifmgd->ave_beacon_signal) / 16;
2559                 ifmgd->count_beacon_signal++;
2560         }
2561
2562         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2563             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2564                 int sig = ifmgd->ave_beacon_signal;
2565                 int last_sig = ifmgd->last_ave_beacon_signal;
2566
2567                 /*
2568                  * if signal crosses either of the boundaries, invoke callback
2569                  * with appropriate parameters
2570                  */
2571                 if (sig > ifmgd->rssi_max_thold &&
2572                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2573                         ifmgd->last_ave_beacon_signal = sig;
2574                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2575                 } else if (sig < ifmgd->rssi_min_thold &&
2576                            (last_sig >= ifmgd->rssi_max_thold ||
2577                            last_sig == 0)) {
2578                         ifmgd->last_ave_beacon_signal = sig;
2579                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2580                 }
2581         }
2582
2583         if (bss_conf->cqm_rssi_thold &&
2584             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2585             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2586                 int sig = ifmgd->ave_beacon_signal / 16;
2587                 int last_event = ifmgd->last_cqm_event_signal;
2588                 int thold = bss_conf->cqm_rssi_thold;
2589                 int hyst = bss_conf->cqm_rssi_hyst;
2590                 if (sig < thold &&
2591                     (last_event == 0 || sig < last_event - hyst)) {
2592                         ifmgd->last_cqm_event_signal = sig;
2593                         ieee80211_cqm_rssi_notify(
2594                                 &sdata->vif,
2595                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2596                                 GFP_KERNEL);
2597                 } else if (sig > thold &&
2598                            (last_event == 0 || sig > last_event + hyst)) {
2599                         ifmgd->last_cqm_event_signal = sig;
2600                         ieee80211_cqm_rssi_notify(
2601                                 &sdata->vif,
2602                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2603                                 GFP_KERNEL);
2604                 }
2605         }
2606
2607         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2608                 mlme_dbg_ratelimited(sdata,
2609                                      "cancelling probereq poll due to a received beacon\n");
2610                 mutex_lock(&local->mtx);
2611                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2612                 ieee80211_run_deferred_scan(local);
2613                 mutex_unlock(&local->mtx);
2614
2615                 mutex_lock(&local->iflist_mtx);
2616                 ieee80211_recalc_ps(local, -1);
2617                 mutex_unlock(&local->iflist_mtx);
2618         }
2619
2620         /*
2621          * Push the beacon loss detection into the future since
2622          * we are processing a beacon from the AP just now.
2623          */
2624         ieee80211_sta_reset_beacon_monitor(sdata);
2625
2626         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2627         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2628                                           len - baselen, &elems,
2629                                           care_about_ies, ncrc);
2630
2631         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2632                 bool directed_tim = ieee80211_check_tim(elems.tim,
2633                                                         elems.tim_len,
2634                                                         ifmgd->aid);
2635                 if (directed_tim) {
2636                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2637                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2638                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2639                                         ieee80211_hw_config(local,
2640                                                             IEEE80211_CONF_CHANGE_PS);
2641                                 }
2642                                 ieee80211_send_nullfunc(local, sdata, 0);
2643                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2644                                 local->pspolling = true;
2645
2646                                 /*
2647                                  * Here is assumed that the driver will be
2648                                  * able to send ps-poll frame and receive a
2649                                  * response even though power save mode is
2650                                  * enabled, but some drivers might require
2651                                  * to disable power save here. This needs
2652                                  * to be investigated.
2653                                  */
2654                                 ieee80211_send_pspoll(local, sdata);
2655                         }
2656                 }
2657         }
2658
2659         if (sdata->vif.p2p) {
2660                 u8 noa[2];
2661                 int ret;
2662
2663                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2664                                             len - baselen,
2665                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2666                                             noa, sizeof(noa));
2667                 if (ret >= 2 && sdata->u.mgd.p2p_noa_index != noa[0]) {
2668                         bss_conf->p2p_oppps = noa[1] & 0x80;
2669                         bss_conf->p2p_ctwindow = noa[1] & 0x7f;
2670                         changed |= BSS_CHANGED_P2P_PS;
2671                         sdata->u.mgd.p2p_noa_index = noa[0];
2672                         /*
2673                          * make sure we update all information, the CRC
2674                          * mechanism doesn't look at P2P attributes.
2675                          */
2676                         ifmgd->beacon_crc_valid = false;
2677                 }
2678         }
2679
2680         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2681                 return;
2682         ifmgd->beacon_crc = ncrc;
2683         ifmgd->beacon_crc_valid = true;
2684
2685         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2686                               true);
2687
2688         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2689                                      elems.wmm_param_len))
2690                 changed |= BSS_CHANGED_QOS;
2691
2692         if (elems.erp_info && elems.erp_info_len >= 1) {
2693                 erp_valid = true;
2694                 erp_value = elems.erp_info[0];
2695         } else {
2696                 erp_valid = false;
2697         }
2698         changed |= ieee80211_handle_bss_capability(sdata,
2699                         le16_to_cpu(mgmt->u.beacon.capab_info),
2700                         erp_valid, erp_value);
2701
2702
2703         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2704             !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2705                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2706                                                   bssid, true);
2707
2708         if (elems.country_elem && elems.pwr_constr_elem &&
2709             mgmt->u.probe_resp.capab_info &
2710                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
2711                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
2712                                                        elems.country_elem,
2713                                                        elems.country_elem_len,
2714                                                        elems.pwr_constr_elem);
2715
2716         ieee80211_bss_info_change_notify(sdata, changed);
2717 }
2718
2719 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2720                                   struct sk_buff *skb)
2721 {
2722         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2723         struct ieee80211_rx_status *rx_status;
2724         struct ieee80211_mgmt *mgmt;
2725         struct cfg80211_bss *bss = NULL;
2726         enum rx_mgmt_action rma = RX_MGMT_NONE;
2727         u16 fc;
2728
2729         rx_status = (struct ieee80211_rx_status *) skb->cb;
2730         mgmt = (struct ieee80211_mgmt *) skb->data;
2731         fc = le16_to_cpu(mgmt->frame_control);
2732
2733         mutex_lock(&ifmgd->mtx);
2734
2735         switch (fc & IEEE80211_FCTL_STYPE) {
2736         case IEEE80211_STYPE_BEACON:
2737                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2738                 break;
2739         case IEEE80211_STYPE_PROBE_RESP:
2740                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2741                 break;
2742         case IEEE80211_STYPE_AUTH:
2743                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2744                 break;
2745         case IEEE80211_STYPE_DEAUTH:
2746                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2747                 break;
2748         case IEEE80211_STYPE_DISASSOC:
2749                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2750                 break;
2751         case IEEE80211_STYPE_ASSOC_RESP:
2752         case IEEE80211_STYPE_REASSOC_RESP:
2753                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2754                 break;
2755         case IEEE80211_STYPE_ACTION:
2756                 switch (mgmt->u.action.category) {
2757                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2758                         ieee80211_sta_process_chanswitch(sdata,
2759                                         &mgmt->u.action.u.chan_switch.sw_elem,
2760                                         (void *)ifmgd->associated->priv,
2761                                         rx_status->mactime);
2762                         break;
2763                 }
2764         }
2765         mutex_unlock(&ifmgd->mtx);
2766
2767         switch (rma) {
2768         case RX_MGMT_NONE:
2769                 /* no action */
2770                 break;
2771         case RX_MGMT_CFG80211_DEAUTH:
2772                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2773                 break;
2774         case RX_MGMT_CFG80211_DISASSOC:
2775                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2776                 break;
2777         case RX_MGMT_CFG80211_RX_AUTH:
2778                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2779                 break;
2780         case RX_MGMT_CFG80211_RX_ASSOC:
2781                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2782                 break;
2783         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2784                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2785                 break;
2786         default:
2787                 WARN(1, "unexpected: %d", rma);
2788         }
2789 }
2790
2791 static void ieee80211_sta_timer(unsigned long data)
2792 {
2793         struct ieee80211_sub_if_data *sdata =
2794                 (struct ieee80211_sub_if_data *) data;
2795         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2796         struct ieee80211_local *local = sdata->local;
2797
2798         if (local->quiescing) {
2799                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2800                 return;
2801         }
2802
2803         ieee80211_queue_work(&local->hw, &sdata->work);
2804 }
2805
2806 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2807                                           u8 *bssid, u8 reason)
2808 {
2809         struct ieee80211_local *local = sdata->local;
2810         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2811         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2812
2813         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2814                                false, frame_buf);
2815         mutex_unlock(&ifmgd->mtx);
2816
2817         /*
2818          * must be outside lock due to cfg80211,
2819          * but that's not a problem.
2820          */
2821         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2822
2823         mutex_lock(&local->mtx);
2824         ieee80211_recalc_idle(local);
2825         mutex_unlock(&local->mtx);
2826
2827         mutex_lock(&ifmgd->mtx);
2828 }
2829
2830 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2831 {
2832         struct ieee80211_local *local = sdata->local;
2833         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2834         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2835
2836         lockdep_assert_held(&ifmgd->mtx);
2837
2838         if (WARN_ON_ONCE(!auth_data))
2839                 return -EINVAL;
2840
2841         auth_data->tries++;
2842
2843         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2844                 sdata_info(sdata, "authentication with %pM timed out\n",
2845                            auth_data->bss->bssid);
2846
2847                 /*
2848                  * Most likely AP is not in the range so remove the
2849                  * bss struct for that AP.
2850                  */
2851                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2852
2853                 return -ETIMEDOUT;
2854         }
2855
2856         drv_mgd_prepare_tx(local, sdata);
2857
2858         if (auth_data->bss->proberesp_ies) {
2859                 u16 trans = 1;
2860                 u16 status = 0;
2861
2862                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2863                            auth_data->bss->bssid, auth_data->tries,
2864                            IEEE80211_AUTH_MAX_TRIES);
2865
2866                 auth_data->expected_transaction = 2;
2867
2868                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
2869                         trans = auth_data->sae_trans;
2870                         status = auth_data->sae_status;
2871                         auth_data->expected_transaction = trans;
2872                 }
2873
2874                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
2875                                     auth_data->data, auth_data->data_len,
2876                                     auth_data->bss->bssid,
2877                                     auth_data->bss->bssid, NULL, 0, 0);
2878         } else {
2879                 const u8 *ssidie;
2880
2881                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2882                            auth_data->bss->bssid, auth_data->tries,
2883                            IEEE80211_AUTH_MAX_TRIES);
2884
2885                 rcu_read_lock();
2886                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2887                 if (!ssidie) {
2888                         rcu_read_unlock();
2889                         return -EINVAL;
2890                 }
2891                 /*
2892                  * Direct probe is sent to broadcast address as some APs
2893                  * will not answer to direct packet in unassociated state.
2894                  */
2895                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2896                                          NULL, 0, (u32) -1, true, false,
2897                                          auth_data->bss->channel, false);
2898                 rcu_read_unlock();
2899         }
2900
2901         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2902         run_again(ifmgd, auth_data->timeout);
2903
2904         return 0;
2905 }
2906
2907 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2908 {
2909         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2910         struct ieee80211_local *local = sdata->local;
2911
2912         lockdep_assert_held(&sdata->u.mgd.mtx);
2913
2914         assoc_data->tries++;
2915         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2916                 sdata_info(sdata, "association with %pM timed out\n",
2917                            assoc_data->bss->bssid);
2918
2919                 /*
2920                  * Most likely AP is not in the range so remove the
2921                  * bss struct for that AP.
2922                  */
2923                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2924
2925                 return -ETIMEDOUT;
2926         }
2927
2928         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2929                    assoc_data->bss->bssid, assoc_data->tries,
2930                    IEEE80211_ASSOC_MAX_TRIES);
2931         ieee80211_send_assoc(sdata);
2932
2933         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2934         run_again(&sdata->u.mgd, assoc_data->timeout);
2935
2936         return 0;
2937 }
2938
2939 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2940 {
2941         struct ieee80211_local *local = sdata->local;
2942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2943
2944         mutex_lock(&ifmgd->mtx);
2945
2946         if (ifmgd->auth_data &&
2947             time_after(jiffies, ifmgd->auth_data->timeout)) {
2948                 if (ifmgd->auth_data->done) {
2949                         /*
2950                          * ok ... we waited for assoc but userspace didn't,
2951                          * so let's just kill the auth data
2952                          */
2953                         ieee80211_destroy_auth_data(sdata, false);
2954                 } else if (ieee80211_probe_auth(sdata)) {
2955                         u8 bssid[ETH_ALEN];
2956
2957                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2958
2959                         ieee80211_destroy_auth_data(sdata, false);
2960
2961                         mutex_unlock(&ifmgd->mtx);
2962                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2963                         mutex_lock(&ifmgd->mtx);
2964                 }
2965         } else if (ifmgd->auth_data)
2966                 run_again(ifmgd, ifmgd->auth_data->timeout);
2967
2968         if (ifmgd->assoc_data &&
2969             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2970                 if (!ifmgd->assoc_data->have_beacon ||
2971                     ieee80211_do_assoc(sdata)) {
2972                         u8 bssid[ETH_ALEN];
2973
2974                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2975
2976                         ieee80211_destroy_assoc_data(sdata, false);
2977
2978                         mutex_unlock(&ifmgd->mtx);
2979                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2980                         mutex_lock(&ifmgd->mtx);
2981                 }
2982         } else if (ifmgd->assoc_data)
2983                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2984
2985         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2986                             IEEE80211_STA_CONNECTION_POLL) &&
2987             ifmgd->associated) {
2988                 u8 bssid[ETH_ALEN];
2989                 int max_tries;
2990
2991                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2992
2993                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2994                         max_tries = max_nullfunc_tries;
2995                 else
2996                         max_tries = max_probe_tries;
2997
2998                 /* ACK received for nullfunc probing frame */
2999                 if (!ifmgd->probe_send_count)
3000                         ieee80211_reset_ap_probe(sdata);
3001                 else if (ifmgd->nullfunc_failed) {
3002                         if (ifmgd->probe_send_count < max_tries) {
3003                                 mlme_dbg(sdata,
3004                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3005                                          bssid, ifmgd->probe_send_count,
3006                                          max_tries);
3007                                 ieee80211_mgd_probe_ap_send(sdata);
3008                         } else {
3009                                 mlme_dbg(sdata,
3010                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3011                                          bssid);
3012                                 ieee80211_sta_connection_lost(sdata, bssid,
3013                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3014                         }
3015                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3016                         run_again(ifmgd, ifmgd->probe_timeout);
3017                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3018                         mlme_dbg(sdata,
3019                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3020                                  bssid, probe_wait_ms);
3021                         ieee80211_sta_connection_lost(sdata, bssid,
3022                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3023                 } else if (ifmgd->probe_send_count < max_tries) {
3024                         mlme_dbg(sdata,
3025                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3026                                  bssid, probe_wait_ms,
3027                                  ifmgd->probe_send_count, max_tries);
3028                         ieee80211_mgd_probe_ap_send(sdata);
3029                 } else {
3030                         /*
3031                          * We actually lost the connection ... or did we?
3032                          * Let's make sure!
3033                          */
3034                         wiphy_debug(local->hw.wiphy,
3035                                     "%s: No probe response from AP %pM"
3036                                     " after %dms, disconnecting.\n",
3037                                     sdata->name,
3038                                     bssid, probe_wait_ms);
3039
3040                         ieee80211_sta_connection_lost(sdata, bssid,
3041                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3042                 }
3043         }
3044
3045         mutex_unlock(&ifmgd->mtx);
3046
3047         mutex_lock(&local->mtx);
3048         ieee80211_recalc_idle(local);
3049         mutex_unlock(&local->mtx);
3050 }
3051
3052 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3053 {
3054         struct ieee80211_sub_if_data *sdata =
3055                 (struct ieee80211_sub_if_data *) data;
3056         struct ieee80211_local *local = sdata->local;
3057
3058         if (local->quiescing)
3059                 return;
3060
3061         ieee80211_queue_work(&sdata->local->hw,
3062                              &sdata->u.mgd.beacon_connection_loss_work);
3063 }
3064
3065 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3066 {
3067         struct ieee80211_sub_if_data *sdata =
3068                 (struct ieee80211_sub_if_data *) data;
3069         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3070         struct ieee80211_local *local = sdata->local;
3071
3072         if (local->quiescing)
3073                 return;
3074
3075         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3076 }
3077
3078 static void ieee80211_sta_monitor_work(struct work_struct *work)
3079 {
3080         struct ieee80211_sub_if_data *sdata =
3081                 container_of(work, struct ieee80211_sub_if_data,
3082                              u.mgd.monitor_work);
3083
3084         ieee80211_mgd_probe_ap(sdata, false);
3085 }
3086
3087 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3088 {
3089         u32 flags;
3090
3091         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3092                 __ieee80211_stop_poll(sdata);
3093
3094                 /* let's probe the connection once */
3095                 flags = sdata->local->hw.flags;
3096                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3097                         ieee80211_queue_work(&sdata->local->hw,
3098                                              &sdata->u.mgd.monitor_work);
3099                 /* and do all the other regular work too */
3100                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3101         }
3102 }
3103
3104 #ifdef CONFIG_PM
3105 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
3106 {
3107         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3108
3109         /*
3110          * we need to use atomic bitops for the running bits
3111          * only because both timers might fire at the same
3112          * time -- the code here is properly synchronised.
3113          */
3114
3115         cancel_work_sync(&ifmgd->request_smps_work);
3116
3117         cancel_work_sync(&ifmgd->monitor_work);
3118         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
3119         cancel_work_sync(&ifmgd->csa_connection_drop_work);
3120         if (del_timer_sync(&ifmgd->timer))
3121                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
3122
3123         cancel_work_sync(&ifmgd->chswitch_work);
3124         if (del_timer_sync(&ifmgd->chswitch_timer))
3125                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
3126
3127         /* these will just be re-established on connection */
3128         del_timer_sync(&ifmgd->conn_mon_timer);
3129         del_timer_sync(&ifmgd->bcn_mon_timer);
3130 }
3131
3132 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3133 {
3134         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3135
3136         if (!ifmgd->associated)
3137                 return;
3138
3139         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3140                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3141                 mutex_lock(&ifmgd->mtx);
3142                 if (ifmgd->associated) {
3143                         mlme_dbg(sdata,
3144                                  "driver requested disconnect after resume\n");
3145                         ieee80211_sta_connection_lost(sdata,
3146                                 ifmgd->associated->bssid,
3147                                 WLAN_REASON_UNSPECIFIED);
3148                         mutex_unlock(&ifmgd->mtx);
3149                         return;
3150                 }
3151                 mutex_unlock(&ifmgd->mtx);
3152         }
3153
3154         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
3155                 add_timer(&ifmgd->timer);
3156         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
3157                 add_timer(&ifmgd->chswitch_timer);
3158         ieee80211_sta_reset_beacon_monitor(sdata);
3159
3160         mutex_lock(&sdata->local->mtx);
3161         ieee80211_restart_sta_timer(sdata);
3162         mutex_unlock(&sdata->local->mtx);
3163 }
3164 #endif
3165
3166 /* interface setup */
3167 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3168 {
3169         struct ieee80211_if_managed *ifmgd;
3170
3171         ifmgd = &sdata->u.mgd;
3172         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3173         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3174         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3175                   ieee80211_beacon_connection_loss_work);
3176         INIT_WORK(&ifmgd->csa_connection_drop_work,
3177                   ieee80211_csa_connection_drop_work);
3178         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3179         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3180                     (unsigned long) sdata);
3181         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3182                     (unsigned long) sdata);
3183         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3184                     (unsigned long) sdata);
3185         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3186                     (unsigned long) sdata);
3187
3188         ifmgd->flags = 0;
3189         ifmgd->powersave = sdata->wdev.ps;
3190         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3191         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3192
3193         mutex_init(&ifmgd->mtx);
3194
3195         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3196                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3197         else
3198                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3199 }
3200
3201 /* scan finished notification */
3202 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3203 {
3204         struct ieee80211_sub_if_data *sdata;
3205
3206         /* Restart STA timers */
3207         rcu_read_lock();
3208         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3209                 ieee80211_restart_sta_timer(sdata);
3210         rcu_read_unlock();
3211 }
3212
3213 int ieee80211_max_network_latency(struct notifier_block *nb,
3214                                   unsigned long data, void *dummy)
3215 {
3216         s32 latency_usec = (s32) data;
3217         struct ieee80211_local *local =
3218                 container_of(nb, struct ieee80211_local,
3219                              network_latency_notifier);
3220
3221         mutex_lock(&local->iflist_mtx);
3222         ieee80211_recalc_ps(local, latency_usec);
3223         mutex_unlock(&local->iflist_mtx);
3224
3225         return 0;
3226 }
3227
3228 static u32 chandef_downgrade(struct cfg80211_chan_def *c)
3229 {
3230         u32 ret;
3231         int tmp;
3232
3233         switch (c->width) {
3234         case NL80211_CHAN_WIDTH_20:
3235                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3236                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3237                 break;
3238         case NL80211_CHAN_WIDTH_40:
3239                 c->width = NL80211_CHAN_WIDTH_20;
3240                 c->center_freq1 = c->chan->center_freq;
3241                 ret = IEEE80211_STA_DISABLE_40MHZ |
3242                       IEEE80211_STA_DISABLE_VHT;
3243                 break;
3244         case NL80211_CHAN_WIDTH_80:
3245                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
3246                 /* n_P40 */
3247                 tmp /= 2;
3248                 /* freq_P40 */
3249                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
3250                 c->width = NL80211_CHAN_WIDTH_40;
3251                 ret = IEEE80211_STA_DISABLE_VHT;
3252                 break;
3253         case NL80211_CHAN_WIDTH_80P80:
3254                 c->center_freq2 = 0;
3255                 c->width = NL80211_CHAN_WIDTH_80;
3256                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3257                       IEEE80211_STA_DISABLE_160MHZ;
3258                 break;
3259         case NL80211_CHAN_WIDTH_160:
3260                 /* n_P20 */
3261                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
3262                 /* n_P80 */
3263                 tmp /= 4;
3264                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
3265                 c->width = NL80211_CHAN_WIDTH_80;
3266                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3267                       IEEE80211_STA_DISABLE_160MHZ;
3268                 break;
3269         default:
3270         case NL80211_CHAN_WIDTH_20_NOHT:
3271                 WARN_ON_ONCE(1);
3272                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3273                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3274                 break;
3275         }
3276
3277         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
3278
3279         return ret;
3280 }
3281
3282 static u32
3283 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
3284                              struct ieee80211_supported_band *sband,
3285                              struct ieee80211_channel *channel,
3286                              const struct ieee80211_ht_operation *ht_oper,
3287                              const struct ieee80211_vht_operation *vht_oper,
3288                              struct cfg80211_chan_def *chandef)
3289 {
3290         struct cfg80211_chan_def vht_chandef;
3291         u32 ht_cfreq, ret;
3292
3293         chandef->chan = channel;
3294         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
3295         chandef->center_freq1 = channel->center_freq;
3296         chandef->center_freq2 = 0;
3297
3298         if (!ht_oper || !sband->ht_cap.ht_supported) {
3299                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3300                 goto out;
3301         }
3302
3303         chandef->width = NL80211_CHAN_WIDTH_20;
3304
3305         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3306                                                   channel->band);
3307         /* check that channel matches the right operating channel */
3308         if (channel->center_freq != ht_cfreq) {
3309                 /*
3310                  * It's possible that some APs are confused here;
3311                  * Netgear WNDR3700 sometimes reports 4 higher than
3312                  * the actual channel in association responses, but
3313                  * since we look at probe response/beacon data here
3314                  * it should be OK.
3315                  */
3316                 sdata_info(sdata,
3317                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3318                            channel->center_freq, ht_cfreq,
3319                            ht_oper->primary_chan, channel->band);
3320                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3321                 goto out;
3322         }
3323
3324         /* check 40 MHz support, if we have it */
3325         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3326                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3327                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3328                         chandef->width = NL80211_CHAN_WIDTH_40;
3329                         chandef->center_freq1 += 10;
3330                         break;
3331                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3332                         chandef->width = NL80211_CHAN_WIDTH_40;
3333                         chandef->center_freq1 -= 10;
3334                         break;
3335                 }
3336         } else {
3337                 /* 40 MHz (and 80 MHz) must be supported for VHT */
3338                 ret = IEEE80211_STA_DISABLE_VHT;
3339                 goto out;
3340         }
3341
3342         if (!vht_oper || !sband->vht_cap.vht_supported) {
3343                 ret = IEEE80211_STA_DISABLE_VHT;
3344                 goto out;
3345         }
3346
3347         vht_chandef.chan = channel;
3348         vht_chandef.center_freq1 =
3349                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
3350                                                channel->band);
3351         vht_chandef.center_freq2 = 0;
3352
3353         if (vht_oper->center_freq_seg2_idx)
3354                 vht_chandef.center_freq2 =
3355                         ieee80211_channel_to_frequency(
3356                                 vht_oper->center_freq_seg2_idx,
3357                                 channel->band);
3358
3359         switch (vht_oper->chan_width) {
3360         case IEEE80211_VHT_CHANWIDTH_USE_HT:
3361                 vht_chandef.width = chandef->width;
3362                 break;
3363         case IEEE80211_VHT_CHANWIDTH_80MHZ:
3364                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
3365                 break;
3366         case IEEE80211_VHT_CHANWIDTH_160MHZ:
3367                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
3368                 break;
3369         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
3370                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
3371                 break;
3372         default:
3373                 sdata_info(sdata,
3374                            "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
3375                            vht_oper->chan_width);
3376                 ret = IEEE80211_STA_DISABLE_VHT;
3377                 goto out;
3378         }
3379
3380         if (!cfg80211_chandef_valid(&vht_chandef)) {
3381                 sdata_info(sdata,
3382                            "AP VHT information is invalid, disable VHT\n");
3383                 ret = IEEE80211_STA_DISABLE_VHT;
3384                 goto out;
3385         }
3386
3387         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
3388                 ret = 0;
3389                 goto out;
3390         }
3391
3392         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
3393                 sdata_info(sdata,
3394                            "AP VHT information doesn't match HT, disable VHT\n");
3395                 ret = IEEE80211_STA_DISABLE_VHT;
3396                 goto out;
3397         }
3398
3399         *chandef = vht_chandef;
3400
3401         ret = 0;
3402
3403 out:
3404         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
3405                                         IEEE80211_CHAN_DISABLED)) {
3406                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
3407                         ret = IEEE80211_STA_DISABLE_HT |
3408                               IEEE80211_STA_DISABLE_VHT;
3409                         goto out;
3410                 }
3411
3412                 ret |= chandef_downgrade(chandef);
3413         }
3414
3415         if (chandef->width != vht_chandef.width)
3416                 sdata_info(sdata,
3417                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
3418
3419         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
3420         return ret;
3421 }
3422
3423 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3424                                      struct cfg80211_bss *cbss)
3425 {
3426         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3427         const u8 *ht_cap_ie, *vht_cap_ie;
3428         const struct ieee80211_ht_cap *ht_cap;
3429         const struct ieee80211_vht_cap *vht_cap;
3430         u8 chains = 1;
3431
3432         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3433                 return chains;
3434
3435         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3436         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3437                 ht_cap = (void *)(ht_cap_ie + 2);
3438                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3439                 /*
3440                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3441                  *       "Tx Unequal Modulation Supported" fields.
3442                  */
3443         }
3444
3445         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3446                 return chains;
3447
3448         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3449         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3450                 u8 nss;
3451                 u16 tx_mcs_map;
3452
3453                 vht_cap = (void *)(vht_cap_ie + 2);
3454                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3455                 for (nss = 8; nss > 0; nss--) {
3456                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3457                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3458                                 break;
3459                 }
3460                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3461                 chains = max(chains, nss);
3462         }
3463
3464         return chains;
3465 }
3466
3467 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3468                                   struct cfg80211_bss *cbss)
3469 {
3470         struct ieee80211_local *local = sdata->local;
3471         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3472         const struct ieee80211_ht_operation *ht_oper = NULL;
3473         const struct ieee80211_vht_operation *vht_oper = NULL;
3474         struct ieee80211_supported_band *sband;
3475         struct cfg80211_chan_def chandef;
3476         int ret;
3477
3478         sband = local->hw.wiphy->bands[cbss->channel->band];
3479
3480         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3481                           IEEE80211_STA_DISABLE_80P80MHZ |
3482                           IEEE80211_STA_DISABLE_160MHZ);
3483
3484         rcu_read_lock();
3485
3486         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3487             sband->ht_cap.ht_supported) {
3488                 const u8 *ht_oper_ie;
3489
3490                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3491                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3492                         ht_oper = (void *)(ht_oper_ie + 2);
3493         }
3494
3495         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3496             sband->vht_cap.vht_supported) {
3497                 const u8 *vht_oper_ie;
3498
3499                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3500                                                    WLAN_EID_VHT_OPERATION);
3501                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3502                         vht_oper = (void *)(vht_oper_ie + 2);
3503                 if (vht_oper && !ht_oper) {
3504                         vht_oper = NULL;
3505                         sdata_info(sdata,
3506                                    "AP advertised VHT without HT, disabling both\n");
3507                         sdata->flags |= IEEE80211_STA_DISABLE_HT;
3508                         sdata->flags |= IEEE80211_STA_DISABLE_VHT;
3509                 }
3510         }
3511
3512         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3513                                                      cbss->channel,
3514                                                      ht_oper, vht_oper,
3515                                                      &chandef);
3516
3517         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3518                                       local->rx_chains);
3519
3520         rcu_read_unlock();
3521
3522         /* will change later if needed */
3523         sdata->smps_mode = IEEE80211_SMPS_OFF;
3524
3525         /*
3526          * If this fails (possibly due to channel context sharing
3527          * on incompatible channels, e.g. 80+80 and 160 sharing the
3528          * same control channel) try to use a smaller bandwidth.
3529          */
3530         ret = ieee80211_vif_use_channel(sdata, &chandef,
3531                                         IEEE80211_CHANCTX_SHARED);
3532         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3533                 ifmgd->flags |= chandef_downgrade(&chandef);
3534                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3535                                                 IEEE80211_CHANCTX_SHARED);
3536         }
3537         return ret;
3538 }
3539
3540 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3541                                      struct cfg80211_bss *cbss, bool assoc)
3542 {
3543         struct ieee80211_local *local = sdata->local;
3544         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3545         struct ieee80211_bss *bss = (void *)cbss->priv;
3546         struct sta_info *new_sta = NULL;
3547         bool have_sta = false;
3548         int err;
3549
3550         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3551                 return -EINVAL;
3552
3553         if (assoc) {
3554                 rcu_read_lock();
3555                 have_sta = sta_info_get(sdata, cbss->bssid);
3556                 rcu_read_unlock();
3557         }
3558
3559         if (!have_sta) {
3560                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3561                 if (!new_sta)
3562                         return -ENOMEM;
3563         }
3564
3565         mutex_lock(&local->mtx);
3566         ieee80211_recalc_idle(sdata->local);
3567         mutex_unlock(&local->mtx);
3568
3569         if (new_sta) {
3570                 u32 rates = 0, basic_rates = 0;
3571                 bool have_higher_than_11mbit;
3572                 int min_rate = INT_MAX, min_rate_index = -1;
3573                 struct ieee80211_supported_band *sband;
3574
3575                 sband = local->hw.wiphy->bands[cbss->channel->band];
3576
3577                 err = ieee80211_prep_channel(sdata, cbss);
3578                 if (err) {
3579                         sta_info_free(local, new_sta);
3580                         return err;
3581                 }
3582
3583                 ieee80211_get_rates(sband, bss->supp_rates,
3584                                     bss->supp_rates_len,
3585                                     &rates, &basic_rates,
3586                                     &have_higher_than_11mbit,
3587                                     &min_rate, &min_rate_index);
3588
3589                 /*
3590                  * This used to be a workaround for basic rates missing
3591                  * in the association response frame. Now that we no
3592                  * longer use the basic rates from there, it probably
3593                  * doesn't happen any more, but keep the workaround so
3594                  * in case some *other* APs are buggy in different ways
3595                  * we can connect -- with a warning.
3596                  */
3597                 if (!basic_rates && min_rate_index >= 0) {
3598                         sdata_info(sdata,
3599                                    "No basic rates, using min rate instead\n");
3600                         basic_rates = BIT(min_rate_index);
3601                 }
3602
3603                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3604                 sdata->vif.bss_conf.basic_rates = basic_rates;
3605
3606                 /* cf. IEEE 802.11 9.2.12 */
3607                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3608                     have_higher_than_11mbit)
3609                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3610                 else
3611                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3612
3613                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3614
3615                 /* set timing information */
3616                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3617                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3618                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3619
3620                 /* tell driver about BSSID, basic rates and timing */
3621                 ieee80211_bss_info_change_notify(sdata,
3622                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3623                         BSS_CHANGED_BEACON_INT);
3624
3625                 if (assoc)
3626                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3627
3628                 err = sta_info_insert(new_sta);
3629                 new_sta = NULL;
3630                 if (err) {
3631                         sdata_info(sdata,
3632                                    "failed to insert STA entry for the AP (error %d)\n",
3633                                    err);
3634                         return err;
3635                 }
3636         } else
3637                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3638
3639         return 0;
3640 }
3641
3642 /* config hooks */
3643 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3644                        struct cfg80211_auth_request *req)
3645 {
3646         struct ieee80211_local *local = sdata->local;
3647         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3648         struct ieee80211_mgd_auth_data *auth_data;
3649         u16 auth_alg;
3650         int err;
3651
3652         /* prepare auth data structure */
3653
3654         switch (req->auth_type) {
3655         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3656                 auth_alg = WLAN_AUTH_OPEN;
3657                 break;
3658         case NL80211_AUTHTYPE_SHARED_KEY:
3659                 if (IS_ERR(local->wep_tx_tfm))
3660                         return -EOPNOTSUPP;
3661                 auth_alg = WLAN_AUTH_SHARED_KEY;
3662                 break;
3663         case NL80211_AUTHTYPE_FT:
3664                 auth_alg = WLAN_AUTH_FT;
3665                 break;
3666         case NL80211_AUTHTYPE_NETWORK_EAP:
3667                 auth_alg = WLAN_AUTH_LEAP;
3668                 break;
3669         case NL80211_AUTHTYPE_SAE:
3670                 auth_alg = WLAN_AUTH_SAE;
3671                 break;
3672         default:
3673                 return -EOPNOTSUPP;
3674         }
3675
3676         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3677                             req->ie_len, GFP_KERNEL);
3678         if (!auth_data)
3679                 return -ENOMEM;
3680
3681         auth_data->bss = req->bss;
3682
3683         if (req->sae_data_len >= 4) {
3684                 __le16 *pos = (__le16 *) req->sae_data;
3685                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3686                 auth_data->sae_status = le16_to_cpu(pos[1]);
3687                 memcpy(auth_data->data, req->sae_data + 4,
3688                        req->sae_data_len - 4);
3689                 auth_data->data_len += req->sae_data_len - 4;
3690         }
3691
3692         if (req->ie && req->ie_len) {
3693                 memcpy(&auth_data->data[auth_data->data_len],
3694                        req->ie, req->ie_len);
3695                 auth_data->data_len += req->ie_len;
3696         }
3697
3698         if (req->key && req->key_len) {
3699                 auth_data->key_len = req->key_len;
3700                 auth_data->key_idx = req->key_idx;
3701                 memcpy(auth_data->key, req->key, req->key_len);
3702         }
3703
3704         auth_data->algorithm = auth_alg;
3705
3706         /* try to authenticate/probe */
3707
3708         mutex_lock(&ifmgd->mtx);
3709
3710         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3711             ifmgd->assoc_data) {
3712                 err = -EBUSY;
3713                 goto err_free;
3714         }
3715
3716         if (ifmgd->auth_data)
3717                 ieee80211_destroy_auth_data(sdata, false);
3718
3719         /* prep auth_data so we don't go into idle on disassoc */
3720         ifmgd->auth_data = auth_data;
3721
3722         if (ifmgd->associated)
3723                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3724
3725         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3726
3727         err = ieee80211_prep_connection(sdata, req->bss, false);
3728         if (err)
3729                 goto err_clear;
3730
3731         err = ieee80211_probe_auth(sdata);
3732         if (err) {
3733                 sta_info_destroy_addr(sdata, req->bss->bssid);
3734                 goto err_clear;
3735         }
3736
3737         /* hold our own reference */
3738         cfg80211_ref_bss(auth_data->bss);
3739         err = 0;
3740         goto out_unlock;
3741
3742  err_clear:
3743         memset(ifmgd->bssid, 0, ETH_ALEN);
3744         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3745         ifmgd->auth_data = NULL;
3746  err_free:
3747         kfree(auth_data);
3748  out_unlock:
3749         mutex_unlock(&ifmgd->mtx);
3750
3751         return err;
3752 }
3753
3754 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3755                         struct cfg80211_assoc_request *req)
3756 {
3757         struct ieee80211_local *local = sdata->local;
3758         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3759         struct ieee80211_bss *bss = (void *)req->bss->priv;
3760         struct ieee80211_mgd_assoc_data *assoc_data;
3761         struct ieee80211_supported_band *sband;
3762         const u8 *ssidie, *ht_ie;
3763         int i, err;
3764
3765         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3766         if (!assoc_data)
3767                 return -ENOMEM;
3768
3769         rcu_read_lock();
3770         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3771         if (!ssidie) {
3772                 rcu_read_unlock();
3773                 kfree(assoc_data);
3774                 return -EINVAL;
3775         }
3776         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3777         assoc_data->ssid_len = ssidie[1];
3778         rcu_read_unlock();
3779
3780         mutex_lock(&ifmgd->mtx);
3781
3782         if (ifmgd->associated)
3783                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3784
3785         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3786                 err = -EBUSY;
3787                 goto err_free;
3788         }
3789
3790         if (ifmgd->assoc_data) {
3791                 err = -EBUSY;
3792                 goto err_free;
3793         }
3794
3795         if (ifmgd->auth_data) {
3796                 bool match;
3797
3798                 /* keep sta info, bssid if matching */
3799                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3800                 ieee80211_destroy_auth_data(sdata, match);
3801         }
3802
3803         /* prepare assoc data */
3804
3805         ifmgd->beacon_crc_valid = false;
3806
3807         /*
3808          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3809          * We still associate in non-HT mode (11a/b/g) if any one of these
3810          * ciphers is configured as pairwise.
3811          * We can set this to true for non-11n hardware, that'll be checked
3812          * separately along with the peer capabilities.
3813          */
3814         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3815                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3816                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3817                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3818                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3819                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3820                         netdev_info(sdata->dev,
3821                                     "disabling HT/VHT due to WEP/TKIP use\n");
3822                 }
3823         }
3824
3825         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3826                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3827                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3828         }
3829
3830         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3831         sband = local->hw.wiphy->bands[req->bss->channel->band];
3832         if (!sband->ht_cap.ht_supported ||
3833             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3834                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3835                 if (!bss->wmm_used)
3836                         netdev_info(sdata->dev,
3837                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3838         }
3839
3840         /* disable VHT if we don't support it or the AP doesn't use WMM */
3841         if (!sband->vht_cap.vht_supported ||
3842             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3843                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3844                 if (!bss->wmm_used)
3845                         netdev_info(sdata->dev,
3846                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3847         }
3848
3849         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3850         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3851                sizeof(ifmgd->ht_capa_mask));
3852
3853         if (req->ie && req->ie_len) {
3854                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3855                 assoc_data->ie_len = req->ie_len;
3856         }
3857
3858         assoc_data->bss = req->bss;
3859
3860         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3861                 if (ifmgd->powersave)
3862                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
3863                 else
3864                         sdata->smps_mode = IEEE80211_SMPS_OFF;
3865         } else
3866                 sdata->smps_mode = ifmgd->req_smps;
3867
3868         assoc_data->capability = req->bss->capability;
3869         assoc_data->wmm = bss->wmm_used &&
3870                           (local->hw.queues >= IEEE80211_NUM_ACS);
3871         assoc_data->supp_rates = bss->supp_rates;
3872         assoc_data->supp_rates_len = bss->supp_rates_len;
3873
3874         rcu_read_lock();
3875         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3876         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3877                 assoc_data->ap_ht_param =
3878                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3879         else
3880                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3881         rcu_read_unlock();
3882
3883         if (bss->wmm_used && bss->uapsd_supported &&
3884             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3885                 assoc_data->uapsd = true;
3886                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3887         } else {
3888                 assoc_data->uapsd = false;
3889                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3890         }
3891
3892         if (req->prev_bssid)
3893                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3894
3895         if (req->use_mfp) {
3896                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3897                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3898         } else {
3899                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3900                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3901         }
3902
3903         if (req->crypto.control_port)
3904                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3905         else
3906                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3907
3908         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3909         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3910
3911         /* kick off associate process */
3912
3913         ifmgd->assoc_data = assoc_data;
3914         ifmgd->dtim_period = 0;
3915
3916         err = ieee80211_prep_connection(sdata, req->bss, true);
3917         if (err)
3918                 goto err_clear;
3919
3920         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3921                 const struct cfg80211_bss_ies *beacon_ies;
3922
3923                 rcu_read_lock();
3924                 beacon_ies = rcu_dereference(req->bss->beacon_ies);
3925                 if (!beacon_ies) {
3926                         /*
3927                          * Wait up to one beacon interval ...
3928                          * should this be more if we miss one?
3929                          */
3930                         sdata_info(sdata, "waiting for beacon from %pM\n",
3931                                    ifmgd->bssid);
3932                         assoc_data->timeout =
3933                                 TU_TO_EXP_TIME(req->bss->beacon_interval);
3934                 } else {
3935                         const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3936                                                             beacon_ies->data,
3937                                                             beacon_ies->len);
3938                         if (tim_ie && tim_ie[1] >=
3939                                         sizeof(struct ieee80211_tim_ie)) {
3940                                 const struct ieee80211_tim_ie *tim;
3941                                 tim = (void *)(tim_ie + 2);
3942                                 ifmgd->dtim_period = tim->dtim_period;
3943                         }
3944                         assoc_data->have_beacon = true;
3945                         assoc_data->sent_assoc = false;
3946                         assoc_data->timeout = jiffies;
3947                 }
3948                 rcu_read_unlock();
3949         } else {
3950                 assoc_data->have_beacon = true;
3951                 assoc_data->sent_assoc = false;
3952                 assoc_data->timeout = jiffies;
3953         }
3954         run_again(ifmgd, assoc_data->timeout);
3955
3956         if (bss->corrupt_data) {
3957                 char *corrupt_type = "data";
3958                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3959                         if (bss->corrupt_data &
3960                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3961                                 corrupt_type = "beacon and probe response";
3962                         else
3963                                 corrupt_type = "beacon";
3964                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3965                         corrupt_type = "probe response";
3966                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3967                            corrupt_type);
3968         }
3969
3970         err = 0;
3971         goto out;
3972  err_clear:
3973         memset(ifmgd->bssid, 0, ETH_ALEN);
3974         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3975         ifmgd->assoc_data = NULL;
3976  err_free:
3977         kfree(assoc_data);
3978  out:
3979         mutex_unlock(&ifmgd->mtx);
3980
3981         return err;
3982 }
3983
3984 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3985                          struct cfg80211_deauth_request *req)
3986 {
3987         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3988         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3989         bool tx = !req->local_state_change;
3990         bool sent_frame = false;
3991
3992         mutex_lock(&ifmgd->mtx);
3993
3994         sdata_info(sdata,
3995                    "deauthenticating from %pM by local choice (reason=%d)\n",
3996                    req->bssid, req->reason_code);
3997
3998         if (ifmgd->auth_data) {
3999                 drv_mgd_prepare_tx(sdata->local, sdata);
4000                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4001                                                IEEE80211_STYPE_DEAUTH,
4002                                                req->reason_code, tx,
4003                                                frame_buf);
4004                 ieee80211_destroy_auth_data(sdata, false);
4005                 mutex_unlock(&ifmgd->mtx);
4006
4007                 sent_frame = tx;
4008                 goto out;
4009         }
4010
4011         if (ifmgd->associated &&
4012             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4013                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4014                                        req->reason_code, tx, frame_buf);
4015                 sent_frame = tx;
4016         }
4017         mutex_unlock(&ifmgd->mtx);
4018
4019  out:
4020         mutex_lock(&sdata->local->mtx);
4021         ieee80211_recalc_idle(sdata->local);
4022         mutex_unlock(&sdata->local->mtx);
4023
4024         if (sent_frame)
4025                 __cfg80211_send_deauth(sdata->dev, frame_buf,
4026                                        IEEE80211_DEAUTH_FRAME_LEN);
4027
4028         return 0;
4029 }
4030
4031 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4032                            struct cfg80211_disassoc_request *req)
4033 {
4034         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4035         u8 bssid[ETH_ALEN];
4036         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4037
4038         mutex_lock(&ifmgd->mtx);
4039
4040         /*
4041          * cfg80211 should catch this ... but it's racy since
4042          * we can receive a disassoc frame, process it, hand it
4043          * to cfg80211 while that's in a locked section already
4044          * trying to tell us that the user wants to disconnect.
4045          */
4046         if (ifmgd->associated != req->bss) {
4047                 mutex_unlock(&ifmgd->mtx);
4048                 return -ENOLINK;
4049         }
4050
4051         sdata_info(sdata,
4052                    "disassociating from %pM by local choice (reason=%d)\n",
4053                    req->bss->bssid, req->reason_code);
4054
4055         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4056         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4057                                req->reason_code, !req->local_state_change,
4058                                frame_buf);
4059         mutex_unlock(&ifmgd->mtx);
4060
4061         __cfg80211_send_disassoc(sdata->dev, frame_buf,
4062                                  IEEE80211_DEAUTH_FRAME_LEN);
4063
4064         mutex_lock(&sdata->local->mtx);
4065         ieee80211_recalc_idle(sdata->local);
4066         mutex_unlock(&sdata->local->mtx);
4067
4068         return 0;
4069 }
4070
4071 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4072 {
4073         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4074
4075         mutex_lock(&ifmgd->mtx);
4076         if (ifmgd->assoc_data)
4077                 ieee80211_destroy_assoc_data(sdata, false);
4078         if (ifmgd->auth_data)
4079                 ieee80211_destroy_auth_data(sdata, false);
4080         del_timer_sync(&ifmgd->timer);
4081         mutex_unlock(&ifmgd->mtx);
4082 }
4083
4084 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4085                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4086                                gfp_t gfp)
4087 {
4088         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4089
4090         trace_api_cqm_rssi_notify(sdata, rssi_event);
4091
4092         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4093 }
4094 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);