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->channel;
 195         rcu_read_unlock();
 196         sband = local->hw.wiphy->bands[chan->band];
 197
 198         switch (sdata->vif.bss_conf.channel_type) {
 199         case NL80211_CHAN_HT40PLUS:
 200                 if (chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
 201                         disable_40 = true;
 202                 break;
 203         case NL80211_CHAN_HT40MINUS:
 204                 if (chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
 205                         disable_40 = true;
 206                 break;
 207         default:
 208                 break;
 209         }
 210
 211         /* This can change during the lifetime of the BSS */
 212         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 213                 disable_40 = true;
 214
 215         mutex_lock(&local->sta_mtx);
 216         sta = sta_info_get(sdata, bssid);
 217
 218         WARN_ON_ONCE(!sta);
 219
 220         if (sta && !sta->supports_40mhz)
 221                 disable_40 = true;
 222
 223         if (sta && (!reconfig ||
 224                     (disable_40 != !(sta->sta.ht_cap.cap &
 225                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 226
 227                 if (disable_40)
 228                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 229                 else
 230                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 231
 232                 rate_control_rate_update(local, sband, sta,
 233                                          IEEE80211_RC_BW_CHANGED);
 234         }
 235         mutex_unlock(&local->sta_mtx);
 236
 237         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 238
 239         /* if bss configuration changed store the new one */
 240         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 241                 changed |= BSS_CHANGED_HT;
 242                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 243         }
 244
 245         return changed;
 246 }
 247
 248 /* frame sending functions */
 249
 250 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 251                                       struct ieee80211_supported_band *sband,
 252                                       u32 *rates)
 253 {
 254         int i, j, count;
 255         *rates = 0;
 256         count = 0;
 257         for (i = 0; i < supp_rates_len; i++) {
 258                 int rate = (supp_rates[i] & 0x7F) * 5;
 259
 260                 for (j = 0; j < sband->n_bitrates; j++)
 261                         if (sband->bitrates[j].bitrate == rate) {
 262                                 *rates |= BIT(j);
 263                                 count++;
 264                                 break;
 265                         }
 266         }
 267
 268         return count;
 269 }
 270
 271 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 272                                 struct sk_buff *skb, u8 ap_ht_param,
 273                                 struct ieee80211_supported_band *sband,
 274                                 struct ieee80211_channel *channel,
 275                                 enum ieee80211_smps_mode smps)
 276 {
 277         u8 *pos;
 278         u32 flags = channel->flags;
 279         u16 cap;
 280         struct ieee80211_sta_ht_cap ht_cap;
 281
 282         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 283
 284         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 285         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 286
 287         /* determine capability flags */
 288         cap = ht_cap.cap;
 289
 290         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 291         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 292                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 293                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 294                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 295                 }
 296                 break;
 297         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 298                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 299                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 300                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 301                 }
 302                 break;
 303         }
 304
 305         /*
 306          * If 40 MHz was disabled associate as though we weren't
 307          * capable of 40 MHz -- some broken APs will never fall
 308          * back to trying to transmit in 20 MHz.
 309          */
 310         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 311                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 312                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 313         }
 314
 315         /* set SM PS mode properly */
 316         cap &= ~IEEE80211_HT_CAP_SM_PS;
 317         switch (smps) {
 318         case IEEE80211_SMPS_AUTOMATIC:
 319         case IEEE80211_SMPS_NUM_MODES:
 320                 WARN_ON(1);
 321         case IEEE80211_SMPS_OFF:
 322                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 323                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 324                 break;
 325         case IEEE80211_SMPS_STATIC:
 326                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 327                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 328                 break;
 329         case IEEE80211_SMPS_DYNAMIC:
 330                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 331                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 332                 break;
 333         }
 334
 335         /* reserve and fill IE */
 336         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 337         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 338 }
 339
 340 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 341                                  struct sk_buff *skb,
 342                                  struct ieee80211_supported_band *sband)
 343 {
 344         u8 *pos;
 345         u32 cap;
 346         struct ieee80211_sta_vht_cap vht_cap;
 347
 348         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 349
 350         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 351
 352         /* determine capability flags */
 353         cap = vht_cap.cap;
 354
 355         /* reserve and fill IE */
 356         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 357         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 358 }
 359
 360 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 361 {
 362         struct ieee80211_local *local = sdata->local;
 363         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 364         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 365         struct sk_buff *skb;
 366         struct ieee80211_mgmt *mgmt;
 367         u8 *pos, qos_info;
 368         size_t offset = 0, noffset;
 369         int i, count, rates_len, supp_rates_len;
 370         u16 capab;
 371         struct ieee80211_supported_band *sband;
 372         struct ieee80211_chanctx_conf *chanctx_conf;
 373         struct ieee80211_channel *chan;
 374         u32 rates = 0;
 375
 376         lockdep_assert_held(&ifmgd->mtx);
 377
 378         rcu_read_lock();
 379         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 380         if (WARN_ON(!chanctx_conf)) {
 381                 rcu_read_unlock();
 382                 return;
 383         }
 384         chan = chanctx_conf->channel;
 385         rcu_read_unlock();
 386         sband = local->hw.wiphy->bands[chan->band];
 387
 388         if (assoc_data->supp_rates_len) {
 389                 /*
 390                  * Get all rates supported by the device and the AP as
 391                  * some APs don't like getting a superset of their rates
 392                  * in the association request (e.g. D-Link DAP 1353 in
 393                  * b-only mode)...
 394                  */
 395                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 396                                                        assoc_data->supp_rates_len,
 397                                                        sband, &rates);
 398         } else {
 399                 /*
 400                  * In case AP not provide any supported rates information
 401                  * before association, we send information element(s) with
 402                  * all rates that we support.
 403                  */
 404                 rates = ~0;
 405                 rates_len = sband->n_bitrates;
 406         }
 407
 408         skb = alloc_skb(local->hw.extra_tx_headroom +
 409                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 410                         2 + assoc_data->ssid_len + /* SSID */
 411                         4 + rates_len + /* (extended) rates */
 412                         4 + /* power capability */
 413                         2 + 2 * sband->n_channels + /* supported channels */
 414                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 415                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 416                         assoc_data->ie_len + /* extra IEs */
 417                         9, /* WMM */
 418                         GFP_KERNEL);
 419         if (!skb)
 420                 return;
 421
 422         skb_reserve(skb, local->hw.extra_tx_headroom);
 423
 424         capab = WLAN_CAPABILITY_ESS;
 425
 426         if (sband->band == IEEE80211_BAND_2GHZ) {
 427                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 428                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 429                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 430                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 431         }
 432
 433         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 434                 capab |= WLAN_CAPABILITY_PRIVACY;
 435
 436         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 437             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 438                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 439
 440         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 441         memset(mgmt, 0, 24);
 442         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 443         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 444         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 445
 446         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 447                 skb_put(skb, 10);
 448                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 449                                                   IEEE80211_STYPE_REASSOC_REQ);
 450                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 451                 mgmt->u.reassoc_req.listen_interval =
 452                                 cpu_to_le16(local->hw.conf.listen_interval);
 453                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 454                        ETH_ALEN);
 455         } else {
 456                 skb_put(skb, 4);
 457                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 458                                                   IEEE80211_STYPE_ASSOC_REQ);
 459                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 460                 mgmt->u.assoc_req.listen_interval =
 461                                 cpu_to_le16(local->hw.conf.listen_interval);
 462         }
 463
 464         /* SSID */
 465         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 466         *pos++ = WLAN_EID_SSID;
 467         *pos++ = assoc_data->ssid_len;
 468         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 469
 470         /* add all rates which were marked to be used above */
 471         supp_rates_len = rates_len;
 472         if (supp_rates_len > 8)
 473                 supp_rates_len = 8;
 474
 475         pos = skb_put(skb, supp_rates_len + 2);
 476         *pos++ = WLAN_EID_SUPP_RATES;
 477         *pos++ = supp_rates_len;
 478
 479         count = 0;
 480         for (i = 0; i < sband->n_bitrates; i++) {
 481                 if (BIT(i) & rates) {
 482                         int rate = sband->bitrates[i].bitrate;
 483                         *pos++ = (u8) (rate / 5);
 484                         if (++count == 8)
 485                                 break;
 486                 }
 487         }
 488
 489         if (rates_len > count) {
 490                 pos = skb_put(skb, rates_len - count + 2);
 491                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 492                 *pos++ = rates_len - count;
 493
 494                 for (i++; i < sband->n_bitrates; i++) {
 495                         if (BIT(i) & rates) {
 496                                 int rate = sband->bitrates[i].bitrate;
 497                                 *pos++ = (u8) (rate / 5);
 498                         }
 499                 }
 500         }
 501
 502         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 503                 /* 1. power capabilities */
 504                 pos = skb_put(skb, 4);
 505                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 506                 *pos++ = 2;
 507                 *pos++ = 0; /* min tx power */
 508                 *pos++ = chan->max_power; /* max tx power */
 509
 510                 /* 2. supported channels */
 511                 /* TODO: get this in reg domain format */
 512                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 513                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 514                 *pos++ = 2 * sband->n_channels;
 515                 for (i = 0; i < sband->n_channels; i++) {
 516                         *pos++ = ieee80211_frequency_to_channel(
 517                                         sband->channels[i].center_freq);
 518                         *pos++ = 1; /* one channel in the subband*/
 519                 }
 520         }
 521
 522         /* if present, add any custom IEs that go before HT */
 523         if (assoc_data->ie_len && assoc_data->ie) {
 524                 static const u8 before_ht[] = {
 525                         WLAN_EID_SSID,
 526                         WLAN_EID_SUPP_RATES,
 527                         WLAN_EID_EXT_SUPP_RATES,
 528                         WLAN_EID_PWR_CAPABILITY,
 529                         WLAN_EID_SUPPORTED_CHANNELS,
 530                         WLAN_EID_RSN,
 531                         WLAN_EID_QOS_CAPA,
 532                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 533                         WLAN_EID_MOBILITY_DOMAIN,
 534                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 535                 };
 536                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 537                                              before_ht, ARRAY_SIZE(before_ht),
 538                                              offset);
 539                 pos = skb_put(skb, noffset - offset);
 540                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 541                 offset = noffset;
 542         }
 543
 544         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 545                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 546                                     sband, chan, sdata->smps_mode);
 547
 548         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 549                 ieee80211_add_vht_ie(sdata, skb, sband);
 550
 551         /* if present, add any custom non-vendor IEs that go after HT */
 552         if (assoc_data->ie_len && assoc_data->ie) {
 553                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 554                                                     assoc_data->ie_len,
 555                                                     offset);
 556                 pos = skb_put(skb, noffset - offset);
 557                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 558                 offset = noffset;
 559         }
 560
 561         if (assoc_data->wmm) {
 562                 if (assoc_data->uapsd) {
 563                         qos_info = ifmgd->uapsd_queues;
 564                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 565                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 566                 } else {
 567                         qos_info = 0;
 568                 }
 569
 570                 pos = skb_put(skb, 9);
 571                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 572                 *pos++ = 7; /* len */
 573                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 574                 *pos++ = 0x50;
 575                 *pos++ = 0xf2;
 576                 *pos++ = 2; /* WME */
 577                 *pos++ = 0; /* WME info */
 578                 *pos++ = 1; /* WME ver */
 579                 *pos++ = qos_info;
 580         }
 581
 582         /* add any remaining custom (i.e. vendor specific here) IEs */
 583         if (assoc_data->ie_len && assoc_data->ie) {
 584                 noffset = assoc_data->ie_len;
 585                 pos = skb_put(skb, noffset - offset);
 586                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 587         }
 588
 589         drv_mgd_prepare_tx(local, sdata);
 590
 591         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 592         ieee80211_tx_skb(sdata, skb);
 593 }
 594
 595 void ieee80211_send_pspoll(struct ieee80211_local *local,
 596                            struct ieee80211_sub_if_data *sdata)
 597 {
 598         struct ieee80211_pspoll *pspoll;
 599         struct sk_buff *skb;
 600
 601         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 602         if (!skb)
 603                 return;
 604
 605         pspoll = (struct ieee80211_pspoll *) skb->data;
 606         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 607
 608         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 609         ieee80211_tx_skb(sdata, skb);
 610 }
 611
 612 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 613                              struct ieee80211_sub_if_data *sdata,
 614                              int powersave)
 615 {
 616         struct sk_buff *skb;
 617         struct ieee80211_hdr_3addr *nullfunc;
 618         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 619
 620         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 621         if (!skb)
 622                 return;
 623
 624         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 625         if (powersave)
 626                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 627
 628         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 629         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 630                             IEEE80211_STA_CONNECTION_POLL))
 631                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 632
 633         ieee80211_tx_skb(sdata, skb);
 634 }
 635
 636 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 637                                           struct ieee80211_sub_if_data *sdata)
 638 {
 639         struct sk_buff *skb;
 640         struct ieee80211_hdr *nullfunc;
 641         __le16 fc;
 642
 643         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 644                 return;
 645
 646         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 647         if (!skb)
 648                 return;
 649
 650         skb_reserve(skb, local->hw.extra_tx_headroom);
 651
 652         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 653         memset(nullfunc, 0, 30);
 654         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 655                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 656         nullfunc->frame_control = fc;
 657         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 658         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 659         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 660         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 661
 662         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 663         ieee80211_tx_skb(sdata, skb);
 664 }
 665
 666 /* spectrum management related things */
 667 static void ieee80211_chswitch_work(struct work_struct *work)
 668 {
 669         struct ieee80211_sub_if_data *sdata =
 670                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 671         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 672
 673         if (!ieee80211_sdata_running(sdata))
 674                 return;
 675
 676         mutex_lock(&ifmgd->mtx);
 677         if (!ifmgd->associated)
 678                 goto out;
 679
 680         sdata->local->_oper_channel = sdata->local->csa_channel;
 681         if (!sdata->local->ops->channel_switch) {
 682                 /* call "hw_config" only if doing sw channel switch */
 683                 ieee80211_hw_config(sdata->local,
 684                         IEEE80211_CONF_CHANGE_CHANNEL);
 685         } else {
 686                 /* update the device channel directly */
 687                 sdata->local->hw.conf.channel = sdata->local->_oper_channel;
 688         }
 689
 690         /* XXX: shouldn't really modify cfg80211-owned data! */
 691         ifmgd->associated->channel = sdata->local->_oper_channel;
 692
 693         /* XXX: wait for a beacon first? */
 694         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 695                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 696  out:
 697         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 698         mutex_unlock(&ifmgd->mtx);
 699 }
 700
 701 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 702 {
 703         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 704         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 705
 706         trace_api_chswitch_done(sdata, success);
 707         if (!success) {
 708                 sdata_info(sdata,
 709                            "driver channel switch failed, disconnecting\n");
 710                 ieee80211_queue_work(&sdata->local->hw,
 711                                      &ifmgd->csa_connection_drop_work);
 712         } else {
 713                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 714         }
 715 }
 716 EXPORT_SYMBOL(ieee80211_chswitch_done);
 717
 718 static void ieee80211_chswitch_timer(unsigned long data)
 719 {
 720         struct ieee80211_sub_if_data *sdata =
 721                 (struct ieee80211_sub_if_data *) data;
 722         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 723
 724         if (sdata->local->quiescing) {
 725                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 726                 return;
 727         }
 728
 729         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 730 }
 731
 732 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 733                                       struct ieee80211_channel_sw_ie *sw_elem,
 734                                       struct ieee80211_bss *bss,
 735                                       u64 timestamp)
 736 {
 737         struct cfg80211_bss *cbss =
 738                 container_of((void *)bss, struct cfg80211_bss, priv);
 739         struct ieee80211_channel *new_ch;
 740         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 741         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 742                                                       cbss->channel->band);
 743         struct ieee80211_chanctx *chanctx;
 744
 745         ASSERT_MGD_MTX(ifmgd);
 746
 747         if (!ifmgd->associated)
 748                 return;
 749
 750         if (sdata->local->scanning)
 751                 return;
 752
 753         /* Disregard subsequent beacons if we are already running a timer
 754            processing a CSA */
 755
 756         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 757                 return;
 758
 759         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 760         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
 761                 sdata_info(sdata,
 762                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
 763                            ifmgd->associated->bssid, new_freq);
 764                 ieee80211_queue_work(&sdata->local->hw,
 765                                      &ifmgd->csa_connection_drop_work);
 766                 return;
 767         }
 768
 769         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 770
 771         if (sdata->local->use_chanctx) {
 772                 sdata_info(sdata,
 773                            "not handling channel switch with channel contexts\n");
 774                 ieee80211_queue_work(&sdata->local->hw,
 775                                      &ifmgd->csa_connection_drop_work);
 776         }
 777
 778         mutex_lock(&sdata->local->chanctx_mtx);
 779         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
 780                 mutex_unlock(&sdata->local->chanctx_mtx);
 781                 return;
 782         }
 783         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
 784                                struct ieee80211_chanctx, conf);
 785         if (chanctx->refcount > 1) {
 786                 sdata_info(sdata,
 787                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
 788                 ieee80211_queue_work(&sdata->local->hw,
 789                                      &ifmgd->csa_connection_drop_work);
 790                 mutex_unlock(&sdata->local->chanctx_mtx);
 791                 return;
 792         }
 793         mutex_unlock(&sdata->local->chanctx_mtx);
 794
 795         sdata->local->csa_channel = new_ch;
 796
 797         if (sw_elem->mode)
 798                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 799                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 800
 801         if (sdata->local->ops->channel_switch) {
 802                 /* use driver's channel switch callback */
 803                 struct ieee80211_channel_switch ch_switch = {
 804                         .timestamp = timestamp,
 805                         .block_tx = sw_elem->mode,
 806                         .channel = new_ch,
 807                         .count = sw_elem->count,
 808                 };
 809
 810                 drv_channel_switch(sdata->local, &ch_switch);
 811                 return;
 812         }
 813
 814         /* channel switch handled in software */
 815         if (sw_elem->count <= 1)
 816                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 817         else
 818                 mod_timer(&ifmgd->chswitch_timer,
 819                           TU_TO_EXP_TIME(sw_elem->count *
 820                                          cbss->beacon_interval));
 821 }
 822
 823 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 824                                        struct ieee80211_channel *channel,
 825                                        const u8 *country_ie, u8 country_ie_len,
 826                                        const u8 *pwr_constr_elem)
 827 {
 828         struct ieee80211_country_ie_triplet *triplet;
 829         int chan = ieee80211_frequency_to_channel(channel->center_freq);
 830         int i, chan_pwr, chan_increment, new_ap_level;
 831         bool have_chan_pwr = false;
 832
 833         /* Invalid IE */
 834         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
 835                 return 0;
 836
 837         triplet = (void *)(country_ie + 3);
 838         country_ie_len -= 3;
 839
 840         switch (channel->band) {
 841         default:
 842                 WARN_ON_ONCE(1);
 843                 /* fall through */
 844         case IEEE80211_BAND_2GHZ:
 845         case IEEE80211_BAND_60GHZ:
 846                 chan_increment = 1;
 847                 break;
 848         case IEEE80211_BAND_5GHZ:
 849                 chan_increment = 4;
 850                 break;
 851         }
 852
 853         /* find channel */
 854         while (country_ie_len >= 3) {
 855                 u8 first_channel = triplet->chans.first_channel;
 856
 857                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
 858                         goto next;
 859
 860                 for (i = 0; i < triplet->chans.num_channels; i++) {
 861                         if (first_channel + i * chan_increment == chan) {
 862                                 have_chan_pwr = true;
 863                                 chan_pwr = triplet->chans.max_power;
 864                                 break;
 865                         }
 866                 }
 867                 if (have_chan_pwr)
 868                         break;
 869
 870  next:
 871                 triplet++;
 872                 country_ie_len -= 3;
 873         }
 874
 875         if (!have_chan_pwr)
 876                 return 0;
 877
 878         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
 879
 880         if (sdata->ap_power_level == new_ap_level)
 881                 return 0;
 882
 883         sdata_info(sdata,
 884                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
 885                    new_ap_level, chan_pwr, *pwr_constr_elem,
 886                    sdata->u.mgd.bssid);
 887         sdata->ap_power_level = new_ap_level;
 888         if (__ieee80211_recalc_txpower(sdata))
 889                 return BSS_CHANGED_TXPOWER;
 890         return 0;
 891 }
 892
 893 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 894 {
 895         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 896         struct ieee80211_local *local = sdata->local;
 897         struct ieee80211_conf *conf = &local->hw.conf;
 898
 899         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 900                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 901                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 902
 903         local->disable_dynamic_ps = false;
 904         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 905 }
 906 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 907
 908 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 909 {
 910         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 911         struct ieee80211_local *local = sdata->local;
 912         struct ieee80211_conf *conf = &local->hw.conf;
 913
 914         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 915                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 916                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 917
 918         local->disable_dynamic_ps = true;
 919         conf->dynamic_ps_timeout = 0;
 920         del_timer_sync(&local->dynamic_ps_timer);
 921         ieee80211_queue_work(&local->hw,
 922                              &local->dynamic_ps_enable_work);
 923 }
 924 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 925
 926 /* powersave */
 927 static void ieee80211_enable_ps(struct ieee80211_local *local,
 928                                 struct ieee80211_sub_if_data *sdata)
 929 {
 930         struct ieee80211_conf *conf = &local->hw.conf;
 931
 932         /*
 933          * If we are scanning right now then the parameters will
 934          * take effect when scan finishes.
 935          */
 936         if (local->scanning)
 937                 return;
 938
 939         if (conf->dynamic_ps_timeout > 0 &&
 940             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 941                 mod_timer(&local->dynamic_ps_timer, jiffies +
 942                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 943         } else {
 944                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 945                         ieee80211_send_nullfunc(local, sdata, 1);
 946
 947                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 948                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 949                         return;
 950
 951                 conf->flags |= IEEE80211_CONF_PS;
 952                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 953         }
 954 }
 955
 956 static void ieee80211_change_ps(struct ieee80211_local *local)
 957 {
 958         struct ieee80211_conf *conf = &local->hw.conf;
 959
 960         if (local->ps_sdata) {
 961                 ieee80211_enable_ps(local, local->ps_sdata);
 962         } else if (conf->flags & IEEE80211_CONF_PS) {
 963                 conf->flags &= ~IEEE80211_CONF_PS;
 964                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 965                 del_timer_sync(&local->dynamic_ps_timer);
 966                 cancel_work_sync(&local->dynamic_ps_enable_work);
 967         }
 968 }
 969
 970 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 971 {
 972         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 973         struct sta_info *sta = NULL;
 974         bool authorized = false;
 975
 976         if (!mgd->powersave)
 977                 return false;
 978
 979         if (mgd->broken_ap)
 980                 return false;
 981
 982         if (!mgd->associated)
 983                 return false;
 984
 985         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 986                           IEEE80211_STA_CONNECTION_POLL))
 987                 return false;
 988
 989         rcu_read_lock();
 990         sta = sta_info_get(sdata, mgd->bssid);
 991         if (sta)
 992                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 993         rcu_read_unlock();
 994
 995         return authorized;
 996 }
 997
 998 /* need to hold RTNL or interface lock */
 999 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1000 {
1001         struct ieee80211_sub_if_data *sdata, *found = NULL;
1002         int count = 0;
1003         int timeout;
1004
1005         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1006                 local->ps_sdata = NULL;
1007                 return;
1008         }
1009
1010         list_for_each_entry(sdata, &local->interfaces, list) {
1011                 if (!ieee80211_sdata_running(sdata))
1012                         continue;
1013                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1014                         /* If an AP vif is found, then disable PS
1015                          * by setting the count to zero thereby setting
1016                          * ps_sdata to NULL.
1017                          */
1018                         count = 0;
1019                         break;
1020                 }
1021                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1022                         continue;
1023                 found = sdata;
1024                 count++;
1025         }
1026
1027         if (count == 1 && ieee80211_powersave_allowed(found)) {
1028                 struct ieee80211_conf *conf = &local->hw.conf;
1029                 s32 beaconint_us;
1030
1031                 if (latency < 0)
1032                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1033
1034                 beaconint_us = ieee80211_tu_to_usec(
1035                                         found->vif.bss_conf.beacon_int);
1036
1037                 timeout = local->dynamic_ps_forced_timeout;
1038                 if (timeout < 0) {
1039                         /*
1040                          * Go to full PSM if the user configures a very low
1041                          * latency requirement.
1042                          * The 2000 second value is there for compatibility
1043                          * until the PM_QOS_NETWORK_LATENCY is configured
1044                          * with real values.
1045                          */
1046                         if (latency > (1900 * USEC_PER_MSEC) &&
1047                             latency != (2000 * USEC_PER_SEC))
1048                                 timeout = 0;
1049                         else
1050                                 timeout = 100;
1051                 }
1052                 local->dynamic_ps_user_timeout = timeout;
1053                 if (!local->disable_dynamic_ps)
1054                         conf->dynamic_ps_timeout =
1055                                 local->dynamic_ps_user_timeout;
1056
1057                 if (beaconint_us > latency) {
1058                         local->ps_sdata = NULL;
1059                 } else {
1060                         struct ieee80211_bss *bss;
1061                         int maxslp = 1;
1062                         u8 dtimper;
1063
1064                         bss = (void *)found->u.mgd.associated->priv;
1065                         dtimper = bss->dtim_period;
1066
1067                         /* If the TIM IE is invalid, pretend the value is 1 */
1068                         if (!dtimper)
1069                                 dtimper = 1;
1070                         else if (dtimper > 1)
1071                                 maxslp = min_t(int, dtimper,
1072                                                     latency / beaconint_us);
1073
1074                         local->hw.conf.max_sleep_period = maxslp;
1075                         local->hw.conf.ps_dtim_period = dtimper;
1076                         local->ps_sdata = found;
1077                 }
1078         } else {
1079                 local->ps_sdata = NULL;
1080         }
1081
1082         ieee80211_change_ps(local);
1083 }
1084
1085 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1086 {
1087         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1088
1089         if (sdata->vif.bss_conf.ps != ps_allowed) {
1090                 sdata->vif.bss_conf.ps = ps_allowed;
1091                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1092         }
1093 }
1094
1095 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1096 {
1097         struct ieee80211_local *local =
1098                 container_of(work, struct ieee80211_local,
1099                              dynamic_ps_disable_work);
1100
1101         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1102                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1103                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1104         }
1105
1106         ieee80211_wake_queues_by_reason(&local->hw,
1107                                         IEEE80211_QUEUE_STOP_REASON_PS);
1108 }
1109
1110 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1111 {
1112         struct ieee80211_local *local =
1113                 container_of(work, struct ieee80211_local,
1114                              dynamic_ps_enable_work);
1115         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1116         struct ieee80211_if_managed *ifmgd;
1117         unsigned long flags;
1118         int q;
1119
1120         /* can only happen when PS was just disabled anyway */
1121         if (!sdata)
1122                 return;
1123
1124         ifmgd = &sdata->u.mgd;
1125
1126         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1127                 return;
1128
1129         if (!local->disable_dynamic_ps &&
1130             local->hw.conf.dynamic_ps_timeout > 0) {
1131                 /* don't enter PS if TX frames are pending */
1132                 if (drv_tx_frames_pending(local)) {
1133                         mod_timer(&local->dynamic_ps_timer, jiffies +
1134                                   msecs_to_jiffies(
1135                                   local->hw.conf.dynamic_ps_timeout));
1136                         return;
1137                 }
1138
1139                 /*
1140                  * transmission can be stopped by others which leads to
1141                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1142                  * is not the actual idle state.
1143                  */
1144                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1145                 for (q = 0; q < local->hw.queues; q++) {
1146                         if (local->queue_stop_reasons[q]) {
1147                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1148                                                        flags);
1149                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1150                                           msecs_to_jiffies(
1151                                           local->hw.conf.dynamic_ps_timeout));
1152                                 return;
1153                         }
1154                 }
1155                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1156         }
1157
1158         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1159             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1160                 netif_tx_stop_all_queues(sdata->dev);
1161
1162                 if (drv_tx_frames_pending(local))
1163                         mod_timer(&local->dynamic_ps_timer, jiffies +
1164                                   msecs_to_jiffies(
1165                                   local->hw.conf.dynamic_ps_timeout));
1166                 else {
1167                         ieee80211_send_nullfunc(local, sdata, 1);
1168                         /* Flush to get the tx status of nullfunc frame */
1169                         drv_flush(local, false);
1170                 }
1171         }
1172
1173         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1174               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1175             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1176                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1177                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1178                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1179         }
1180
1181         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1182                 netif_tx_wake_all_queues(sdata->dev);
1183 }
1184
1185 void ieee80211_dynamic_ps_timer(unsigned long data)
1186 {
1187         struct ieee80211_local *local = (void *) data;
1188
1189         if (local->quiescing || local->suspended)
1190                 return;
1191
1192         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1193 }
1194
1195 /* MLME */
1196 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1197                                      struct ieee80211_sub_if_data *sdata,
1198                                      u8 *wmm_param, size_t wmm_param_len)
1199 {
1200         struct ieee80211_tx_queue_params params;
1201         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1202         size_t left;
1203         int count;
1204         u8 *pos, uapsd_queues = 0;
1205
1206         if (!local->ops->conf_tx)
1207                 return false;
1208
1209         if (local->hw.queues < IEEE80211_NUM_ACS)
1210                 return false;
1211
1212         if (!wmm_param)
1213                 return false;
1214
1215         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1216                 return false;
1217
1218         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1219                 uapsd_queues = ifmgd->uapsd_queues;
1220
1221         count = wmm_param[6] & 0x0f;
1222         if (count == ifmgd->wmm_last_param_set)
1223                 return false;
1224         ifmgd->wmm_last_param_set = count;
1225
1226         pos = wmm_param + 8;
1227         left = wmm_param_len - 8;
1228
1229         memset(&params, 0, sizeof(params));
1230
1231         sdata->wmm_acm = 0;
1232         for (; left >= 4; left -= 4, pos += 4) {
1233                 int aci = (pos[0] >> 5) & 0x03;
1234                 int acm = (pos[0] >> 4) & 0x01;
1235                 bool uapsd = false;
1236                 int queue;
1237
1238                 switch (aci) {
1239                 case 1: /* AC_BK */
1240                         queue = 3;
1241                         if (acm)
1242                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1243                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1244                                 uapsd = true;
1245                         break;
1246                 case 2: /* AC_VI */
1247                         queue = 1;
1248                         if (acm)
1249                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1250                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1251                                 uapsd = true;
1252                         break;
1253                 case 3: /* AC_VO */
1254                         queue = 0;
1255                         if (acm)
1256                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1257                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1258                                 uapsd = true;
1259                         break;
1260                 case 0: /* AC_BE */
1261                 default:
1262                         queue = 2;
1263                         if (acm)
1264                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1265                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1266                                 uapsd = true;
1267                         break;
1268                 }
1269
1270                 params.aifs = pos[0] & 0x0f;
1271                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1272                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1273                 params.txop = get_unaligned_le16(pos + 2);
1274                 params.uapsd = uapsd;
1275
1276                 mlme_dbg(sdata,
1277                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1278                          queue, aci, acm,
1279                          params.aifs, params.cw_min, params.cw_max,
1280                          params.txop, params.uapsd);
1281                 sdata->tx_conf[queue] = params;
1282                 if (drv_conf_tx(local, sdata, queue, &params))
1283                         sdata_err(sdata,
1284                                   "failed to set TX queue parameters for queue %d\n",
1285                                   queue);
1286         }
1287
1288         /* enable WMM or activate new settings */
1289         sdata->vif.bss_conf.qos = true;
1290         return true;
1291 }
1292
1293 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1294 {
1295         lockdep_assert_held(&sdata->local->mtx);
1296
1297         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1298                                 IEEE80211_STA_BEACON_POLL);
1299         ieee80211_run_deferred_scan(sdata->local);
1300 }
1301
1302 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1303 {
1304         mutex_lock(&sdata->local->mtx);
1305         __ieee80211_stop_poll(sdata);
1306         mutex_unlock(&sdata->local->mtx);
1307 }
1308
1309 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1310                                            u16 capab, bool erp_valid, u8 erp)
1311 {
1312         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1313         u32 changed = 0;
1314         bool use_protection;
1315         bool use_short_preamble;
1316         bool use_short_slot;
1317
1318         if (erp_valid) {
1319                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1320                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1321         } else {
1322                 use_protection = false;
1323                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1324         }
1325
1326         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1327         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1328                 use_short_slot = true;
1329
1330         if (use_protection != bss_conf->use_cts_prot) {
1331                 bss_conf->use_cts_prot = use_protection;
1332                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1333         }
1334
1335         if (use_short_preamble != bss_conf->use_short_preamble) {
1336                 bss_conf->use_short_preamble = use_short_preamble;
1337                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1338         }
1339
1340         if (use_short_slot != bss_conf->use_short_slot) {
1341                 bss_conf->use_short_slot = use_short_slot;
1342                 changed |= BSS_CHANGED_ERP_SLOT;
1343         }
1344
1345         return changed;
1346 }
1347
1348 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1349                                      struct cfg80211_bss *cbss,
1350                                      u32 bss_info_changed)
1351 {
1352         struct ieee80211_bss *bss = (void *)cbss->priv;
1353         struct ieee80211_local *local = sdata->local;
1354         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1355
1356         bss_info_changed |= BSS_CHANGED_ASSOC;
1357         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1358                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1359
1360         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1361                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1362
1363         sdata->u.mgd.associated = cbss;
1364         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1365
1366         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1367
1368         /* just to be sure */
1369         ieee80211_stop_poll(sdata);
1370
1371         ieee80211_led_assoc(local, 1);
1372
1373         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1374                 bss_conf->dtim_period = bss->dtim_period;
1375         else
1376                 bss_conf->dtim_period = 0;
1377
1378         bss_conf->assoc = 1;
1379
1380         /* Tell the driver to monitor connection quality (if supported) */
1381         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1382             bss_conf->cqm_rssi_thold)
1383                 bss_info_changed |= BSS_CHANGED_CQM;
1384
1385         /* Enable ARP filtering */
1386         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1387                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1388                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1389         }
1390
1391         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1392
1393         mutex_lock(&local->iflist_mtx);
1394         ieee80211_recalc_ps(local, -1);
1395         mutex_unlock(&local->iflist_mtx);
1396
1397         ieee80211_recalc_smps(sdata);
1398         ieee80211_recalc_ps_vif(sdata);
1399
1400         netif_tx_start_all_queues(sdata->dev);
1401         netif_carrier_on(sdata->dev);
1402 }
1403
1404 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1405                                    u16 stype, u16 reason, bool tx,
1406                                    u8 *frame_buf)
1407 {
1408         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1409         struct ieee80211_local *local = sdata->local;
1410         struct sta_info *sta;
1411         u32 changed = 0;
1412
1413         ASSERT_MGD_MTX(ifmgd);
1414
1415         if (WARN_ON_ONCE(tx && !frame_buf))
1416                 return;
1417
1418         if (WARN_ON(!ifmgd->associated))
1419                 return;
1420
1421         ieee80211_stop_poll(sdata);
1422
1423         ifmgd->associated = NULL;
1424
1425         /*
1426          * we need to commit the associated = NULL change because the
1427          * scan code uses that to determine whether this iface should
1428          * go to/wake up from powersave or not -- and could otherwise
1429          * wake the queues erroneously.
1430          */
1431         smp_mb();
1432
1433         /*
1434          * Thus, we can only afterwards stop the queues -- to account
1435          * for the case where another CPU is finishing a scan at this
1436          * time -- we don't want the scan code to enable queues.
1437          */
1438
1439         netif_tx_stop_all_queues(sdata->dev);
1440         netif_carrier_off(sdata->dev);
1441
1442         mutex_lock(&local->sta_mtx);
1443         sta = sta_info_get(sdata, ifmgd->bssid);
1444         if (sta) {
1445                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1446                 ieee80211_sta_tear_down_BA_sessions(sta, false);
1447         }
1448         mutex_unlock(&local->sta_mtx);
1449
1450         /*
1451          * if we want to get out of ps before disassoc (why?) we have
1452          * to do it before sending disassoc, as otherwise the null-packet
1453          * won't be valid.
1454          */
1455         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1456                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1457                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1458         }
1459         local->ps_sdata = NULL;
1460
1461         /* disable per-vif ps */
1462         ieee80211_recalc_ps_vif(sdata);
1463
1464         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1465         if (tx)
1466                 drv_flush(local, false);
1467
1468         /* deauthenticate/disassociate now */
1469         if (tx || frame_buf)
1470                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1471                                                reason, tx, frame_buf);
1472
1473         /* flush out frame */
1474         if (tx)
1475                 drv_flush(local, false);
1476
1477         /* clear bssid only after building the needed mgmt frames */
1478         memset(ifmgd->bssid, 0, ETH_ALEN);
1479
1480         /* remove AP and TDLS peers */
1481         sta_info_flush(local, sdata);
1482
1483         /* finally reset all BSS / config parameters */
1484         changed |= ieee80211_reset_erp_info(sdata);
1485
1486         ieee80211_led_assoc(local, 0);
1487         changed |= BSS_CHANGED_ASSOC;
1488         sdata->vif.bss_conf.assoc = false;
1489
1490         /* on the next assoc, re-program HT parameters */
1491         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1492         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1493
1494         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1495
1496         del_timer_sync(&local->dynamic_ps_timer);
1497         cancel_work_sync(&local->dynamic_ps_enable_work);
1498
1499         /* Disable ARP filtering */
1500         if (sdata->vif.bss_conf.arp_filter_enabled) {
1501                 sdata->vif.bss_conf.arp_filter_enabled = false;
1502                 changed |= BSS_CHANGED_ARP_FILTER;
1503         }
1504
1505         sdata->vif.bss_conf.qos = false;
1506         changed |= BSS_CHANGED_QOS;
1507
1508         /* The BSSID (not really interesting) and HT changed */
1509         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1510         ieee80211_bss_info_change_notify(sdata, changed);
1511
1512         ieee80211_vif_release_channel(sdata);
1513
1514         /* disassociated - set to defaults now */
1515         ieee80211_set_wmm_default(sdata, false);
1516
1517         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1518         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1519         del_timer_sync(&sdata->u.mgd.timer);
1520         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1521
1522         sdata->u.mgd.timers_running = 0;
1523 }
1524
1525 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1526                              struct ieee80211_hdr *hdr)
1527 {
1528         /*
1529          * We can postpone the mgd.timer whenever receiving unicast frames
1530          * from AP because we know that the connection is working both ways
1531          * at that time. But multicast frames (and hence also beacons) must
1532          * be ignored here, because we need to trigger the timer during
1533          * data idle periods for sending the periodic probe request to the
1534          * AP we're connected to.
1535          */
1536         if (is_multicast_ether_addr(hdr->addr1))
1537                 return;
1538
1539         ieee80211_sta_reset_conn_monitor(sdata);
1540 }
1541
1542 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1543 {
1544         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1545         struct ieee80211_local *local = sdata->local;
1546
1547         mutex_lock(&local->mtx);
1548         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1549                               IEEE80211_STA_CONNECTION_POLL))) {
1550                 mutex_unlock(&local->mtx);
1551                 return;
1552         }
1553
1554         __ieee80211_stop_poll(sdata);
1555
1556         mutex_lock(&local->iflist_mtx);
1557         ieee80211_recalc_ps(local, -1);
1558         mutex_unlock(&local->iflist_mtx);
1559
1560         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1561                 goto out;
1562
1563         /*
1564          * We've received a probe response, but are not sure whether
1565          * we have or will be receiving any beacons or data, so let's
1566          * schedule the timers again, just in case.
1567          */
1568         ieee80211_sta_reset_beacon_monitor(sdata);
1569
1570         mod_timer(&ifmgd->conn_mon_timer,
1571                   round_jiffies_up(jiffies +
1572                                    IEEE80211_CONNECTION_IDLE_TIME));
1573 out:
1574         mutex_unlock(&local->mtx);
1575 }
1576
1577 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1578                              struct ieee80211_hdr *hdr, bool ack)
1579 {
1580         if (!ieee80211_is_data(hdr->frame_control))
1581             return;
1582
1583         if (ack)
1584                 ieee80211_sta_reset_conn_monitor(sdata);
1585
1586         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1587             sdata->u.mgd.probe_send_count > 0) {
1588                 if (ack)
1589                         sdata->u.mgd.probe_send_count = 0;
1590                 else
1591                         sdata->u.mgd.nullfunc_failed = true;
1592                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1593         }
1594 }
1595
1596 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1597 {
1598         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1599         const u8 *ssid;
1600         u8 *dst = ifmgd->associated->bssid;
1601         u8 unicast_limit = max(1, max_probe_tries - 3);
1602
1603         /*
1604          * Try sending broadcast probe requests for the last three
1605          * probe requests after the first ones failed since some
1606          * buggy APs only support broadcast probe requests.
1607          */
1608         if (ifmgd->probe_send_count >= unicast_limit)
1609                 dst = NULL;
1610
1611         /*
1612          * When the hardware reports an accurate Tx ACK status, it's
1613          * better to send a nullfunc frame instead of a probe request,
1614          * as it will kick us off the AP quickly if we aren't associated
1615          * anymore. The timeout will be reset if the frame is ACKed by
1616          * the AP.
1617          */
1618         ifmgd->probe_send_count++;
1619
1620         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1621                 ifmgd->nullfunc_failed = false;
1622                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1623         } else {
1624                 int ssid_len;
1625
1626                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1627                 if (WARN_ON_ONCE(ssid == NULL))
1628                         ssid_len = 0;
1629                 else
1630                         ssid_len = ssid[1];
1631
1632                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1633                                          0, (u32) -1, true, false,
1634                                          ifmgd->associated->channel, false);
1635         }
1636
1637         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1638         run_again(ifmgd, ifmgd->probe_timeout);
1639         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1640                 drv_flush(sdata->local, false);
1641 }
1642
1643 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1644                                    bool beacon)
1645 {
1646         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1647         bool already = false;
1648
1649         if (!ieee80211_sdata_running(sdata))
1650                 return;
1651
1652         mutex_lock(&ifmgd->mtx);
1653
1654         if (!ifmgd->associated)
1655                 goto out;
1656
1657         mutex_lock(&sdata->local->mtx);
1658
1659         if (sdata->local->tmp_channel || sdata->local->scanning) {
1660                 mutex_unlock(&sdata->local->mtx);
1661                 goto out;
1662         }
1663
1664         if (beacon)
1665                 mlme_dbg_ratelimited(sdata,
1666                                      "detected beacon loss from AP - sending probe request\n");
1667
1668         ieee80211_cqm_rssi_notify(&sdata->vif,
1669                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1670
1671         /*
1672          * The driver/our work has already reported this event or the
1673          * connection monitoring has kicked in and we have already sent
1674          * a probe request. Or maybe the AP died and the driver keeps
1675          * reporting until we disassociate...
1676          *
1677          * In either case we have to ignore the current call to this
1678          * function (except for setting the correct probe reason bit)
1679          * because otherwise we would reset the timer every time and
1680          * never check whether we received a probe response!
1681          */
1682         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1683                             IEEE80211_STA_CONNECTION_POLL))
1684                 already = true;
1685
1686         if (beacon)
1687                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1688         else
1689                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1690
1691         mutex_unlock(&sdata->local->mtx);
1692
1693         if (already)
1694                 goto out;
1695
1696         mutex_lock(&sdata->local->iflist_mtx);
1697         ieee80211_recalc_ps(sdata->local, -1);
1698         mutex_unlock(&sdata->local->iflist_mtx);
1699
1700         ifmgd->probe_send_count = 0;
1701         ieee80211_mgd_probe_ap_send(sdata);
1702  out:
1703         mutex_unlock(&ifmgd->mtx);
1704 }
1705
1706 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1707                                           struct ieee80211_vif *vif)
1708 {
1709         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1710         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1711         struct cfg80211_bss *cbss;
1712         struct sk_buff *skb;
1713         const u8 *ssid;
1714         int ssid_len;
1715
1716         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1717                 return NULL;
1718
1719         ASSERT_MGD_MTX(ifmgd);
1720
1721         if (ifmgd->associated)
1722                 cbss = ifmgd->associated;
1723         else if (ifmgd->auth_data)
1724                 cbss = ifmgd->auth_data->bss;
1725         else if (ifmgd->assoc_data)
1726                 cbss = ifmgd->assoc_data->bss;
1727         else
1728                 return NULL;
1729
1730         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1731         if (WARN_ON_ONCE(ssid == NULL))
1732                 ssid_len = 0;
1733         else
1734                 ssid_len = ssid[1];
1735
1736         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1737                                         (u32) -1, cbss->channel,
1738                                         ssid + 2, ssid_len,
1739                                         NULL, 0, true);
1740
1741         return skb;
1742 }
1743 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1744
1745 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata,
1746                                    bool transmit_frame)
1747 {
1748         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1749         struct ieee80211_local *local = sdata->local;
1750         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1751
1752         mutex_lock(&ifmgd->mtx);
1753         if (!ifmgd->associated) {
1754                 mutex_unlock(&ifmgd->mtx);
1755                 return;
1756         }
1757
1758         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1759                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1760                                transmit_frame, frame_buf);
1761         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1762         mutex_unlock(&ifmgd->mtx);
1763
1764         /*
1765          * must be outside lock due to cfg80211,
1766          * but that's not a problem.
1767          */
1768         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
1769
1770         mutex_lock(&local->mtx);
1771         ieee80211_recalc_idle(local);
1772         mutex_unlock(&local->mtx);
1773 }
1774
1775 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1776 {
1777         struct ieee80211_sub_if_data *sdata =
1778                 container_of(work, struct ieee80211_sub_if_data,
1779                              u.mgd.beacon_connection_loss_work);
1780         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1781         struct sta_info *sta;
1782
1783         if (ifmgd->associated) {
1784                 rcu_read_lock();
1785                 sta = sta_info_get(sdata, ifmgd->bssid);
1786                 if (sta)
1787                         sta->beacon_loss_count++;
1788                 rcu_read_unlock();
1789         }
1790
1791         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) {
1792                 sdata_info(sdata, "Connection to AP %pM lost\n",
1793                            ifmgd->bssid);
1794                 __ieee80211_disconnect(sdata, false);
1795         } else {
1796                 ieee80211_mgd_probe_ap(sdata, true);
1797         }
1798 }
1799
1800 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
1801 {
1802         struct ieee80211_sub_if_data *sdata =
1803                 container_of(work, struct ieee80211_sub_if_data,
1804                              u.mgd.csa_connection_drop_work);
1805
1806         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1807                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1808         __ieee80211_disconnect(sdata, true);
1809 }
1810
1811 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1812 {
1813         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1814         struct ieee80211_hw *hw = &sdata->local->hw;
1815
1816         trace_api_beacon_loss(sdata);
1817
1818         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1819         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1820 }
1821 EXPORT_SYMBOL(ieee80211_beacon_loss);
1822
1823 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1824 {
1825         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1826         struct ieee80211_hw *hw = &sdata->local->hw;
1827
1828         trace_api_connection_loss(sdata);
1829
1830         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1831         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1832 }
1833 EXPORT_SYMBOL(ieee80211_connection_loss);
1834
1835
1836 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1837                                         bool assoc)
1838 {
1839         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1840
1841         lockdep_assert_held(&sdata->u.mgd.mtx);
1842
1843         if (!assoc) {
1844                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1845
1846                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1847                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1848                 ieee80211_vif_release_channel(sdata);
1849         }
1850
1851         cfg80211_put_bss(auth_data->bss);
1852         kfree(auth_data);
1853         sdata->u.mgd.auth_data = NULL;
1854 }
1855
1856 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1857                                      struct ieee80211_mgmt *mgmt, size_t len)
1858 {
1859         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1860         u8 *pos;
1861         struct ieee802_11_elems elems;
1862
1863         pos = mgmt->u.auth.variable;
1864         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1865         if (!elems.challenge)
1866                 return;
1867         auth_data->expected_transaction = 4;
1868         drv_mgd_prepare_tx(sdata->local, sdata);
1869         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
1870                             elems.challenge - 2, elems.challenge_len + 2,
1871                             auth_data->bss->bssid, auth_data->bss->bssid,
1872                             auth_data->key, auth_data->key_len,
1873                             auth_data->key_idx);
1874 }
1875
1876 static enum rx_mgmt_action __must_check
1877 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1878                        struct ieee80211_mgmt *mgmt, size_t len)
1879 {
1880         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1881         u8 bssid[ETH_ALEN];
1882         u16 auth_alg, auth_transaction, status_code;
1883         struct sta_info *sta;
1884
1885         lockdep_assert_held(&ifmgd->mtx);
1886
1887         if (len < 24 + 6)
1888                 return RX_MGMT_NONE;
1889
1890         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1891                 return RX_MGMT_NONE;
1892
1893         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1894
1895         if (!ether_addr_equal(bssid, mgmt->bssid))
1896                 return RX_MGMT_NONE;
1897
1898         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1899         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1900         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1901
1902         if (auth_alg != ifmgd->auth_data->algorithm ||
1903             auth_transaction != ifmgd->auth_data->expected_transaction) {
1904                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
1905                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
1906                            auth_transaction,
1907                            ifmgd->auth_data->expected_transaction);
1908                 return RX_MGMT_NONE;
1909         }
1910
1911         if (status_code != WLAN_STATUS_SUCCESS) {
1912                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1913                            mgmt->sa, status_code);
1914                 ieee80211_destroy_auth_data(sdata, false);
1915                 return RX_MGMT_CFG80211_RX_AUTH;
1916         }
1917
1918         switch (ifmgd->auth_data->algorithm) {
1919         case WLAN_AUTH_OPEN:
1920         case WLAN_AUTH_LEAP:
1921         case WLAN_AUTH_FT:
1922         case WLAN_AUTH_SAE:
1923                 break;
1924         case WLAN_AUTH_SHARED_KEY:
1925                 if (ifmgd->auth_data->expected_transaction != 4) {
1926                         ieee80211_auth_challenge(sdata, mgmt, len);
1927                         /* need another frame */
1928                         return RX_MGMT_NONE;
1929                 }
1930                 break;
1931         default:
1932                 WARN_ONCE(1, "invalid auth alg %d",
1933                           ifmgd->auth_data->algorithm);
1934                 return RX_MGMT_NONE;
1935         }
1936
1937         sdata_info(sdata, "authenticated\n");
1938         ifmgd->auth_data->done = true;
1939         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1940         run_again(ifmgd, ifmgd->auth_data->timeout);
1941
1942         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
1943             ifmgd->auth_data->expected_transaction != 2) {
1944                 /*
1945                  * Report auth frame to user space for processing since another
1946                  * round of Authentication frames is still needed.
1947                  */
1948                 return RX_MGMT_CFG80211_RX_AUTH;
1949         }
1950
1951         /* move station state to auth */
1952         mutex_lock(&sdata->local->sta_mtx);
1953         sta = sta_info_get(sdata, bssid);
1954         if (!sta) {
1955                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1956                 goto out_err;
1957         }
1958         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1959                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1960                 goto out_err;
1961         }
1962         mutex_unlock(&sdata->local->sta_mtx);
1963
1964         return RX_MGMT_CFG80211_RX_AUTH;
1965  out_err:
1966         mutex_unlock(&sdata->local->sta_mtx);
1967         /* ignore frame -- wait for timeout */
1968         return RX_MGMT_NONE;
1969 }
1970
1971
1972 static enum rx_mgmt_action __must_check
1973 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1974                          struct ieee80211_mgmt *mgmt, size_t len)
1975 {
1976         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1977         const u8 *bssid = NULL;
1978         u16 reason_code;
1979
1980         lockdep_assert_held(&ifmgd->mtx);
1981
1982         if (len < 24 + 2)
1983                 return RX_MGMT_NONE;
1984
1985         if (!ifmgd->associated ||
1986             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1987                 return RX_MGMT_NONE;
1988
1989         bssid = ifmgd->associated->bssid;
1990
1991         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1992
1993         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1994                    bssid, reason_code);
1995
1996         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1997
1998         mutex_lock(&sdata->local->mtx);
1999         ieee80211_recalc_idle(sdata->local);
2000         mutex_unlock(&sdata->local->mtx);
2001
2002         return RX_MGMT_CFG80211_DEAUTH;
2003 }
2004
2005
2006 static enum rx_mgmt_action __must_check
2007 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2008                            struct ieee80211_mgmt *mgmt, size_t len)
2009 {
2010         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2011         u16 reason_code;
2012
2013         lockdep_assert_held(&ifmgd->mtx);
2014
2015         if (len < 24 + 2)
2016                 return RX_MGMT_NONE;
2017
2018         if (!ifmgd->associated ||
2019             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2020                 return RX_MGMT_NONE;
2021
2022         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2023
2024         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2025                    mgmt->sa, reason_code);
2026
2027         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2028
2029         mutex_lock(&sdata->local->mtx);
2030         ieee80211_recalc_idle(sdata->local);
2031         mutex_unlock(&sdata->local->mtx);
2032
2033         return RX_MGMT_CFG80211_DISASSOC;
2034 }
2035
2036 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2037                                 u8 *supp_rates, unsigned int supp_rates_len,
2038                                 u32 *rates, u32 *basic_rates,
2039                                 bool *have_higher_than_11mbit,
2040                                 int *min_rate, int *min_rate_index)
2041 {
2042         int i, j;
2043
2044         for (i = 0; i < supp_rates_len; i++) {
2045                 int rate = (supp_rates[i] & 0x7f) * 5;
2046                 bool is_basic = !!(supp_rates[i] & 0x80);
2047
2048                 if (rate > 110)
2049                         *have_higher_than_11mbit = true;
2050
2051                 /*
2052                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2053                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2054                  *
2055                  * Note: Even through the membership selector and the basic
2056                  *       rate flag share the same bit, they are not exactly
2057                  *       the same.
2058                  */
2059                 if (!!(supp_rates[i] & 0x80) &&
2060                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2061                         continue;
2062
2063                 for (j = 0; j < sband->n_bitrates; j++) {
2064                         if (sband->bitrates[j].bitrate == rate) {
2065                                 *rates |= BIT(j);
2066                                 if (is_basic)
2067                                         *basic_rates |= BIT(j);
2068                                 if (rate < *min_rate) {
2069                                         *min_rate = rate;
2070                                         *min_rate_index = j;
2071                                 }
2072                                 break;
2073                         }
2074                 }
2075         }
2076 }
2077
2078 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2079                                          bool assoc)
2080 {
2081         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2082
2083         lockdep_assert_held(&sdata->u.mgd.mtx);
2084
2085         if (!assoc) {
2086                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2087
2088                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2089                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2090                 ieee80211_vif_release_channel(sdata);
2091         }
2092
2093         kfree(assoc_data);
2094         sdata->u.mgd.assoc_data = NULL;
2095 }
2096
2097 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2098                                     struct cfg80211_bss *cbss,
2099                                     struct ieee80211_mgmt *mgmt, size_t len)
2100 {
2101         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2102         struct ieee80211_local *local = sdata->local;
2103         struct ieee80211_supported_band *sband;
2104         struct sta_info *sta;
2105         u8 *pos;
2106         u16 capab_info, aid;
2107         struct ieee802_11_elems elems;
2108         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2109         u32 changed = 0;
2110         int err;
2111
2112         /* AssocResp and ReassocResp have identical structure */
2113
2114         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2115         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2116
2117         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2118                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2119                            aid);
2120         aid &= ~(BIT(15) | BIT(14));
2121
2122         ifmgd->broken_ap = false;
2123
2124         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2125                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2126                            aid);
2127                 aid = 0;
2128                 ifmgd->broken_ap = true;
2129         }
2130
2131         pos = mgmt->u.assoc_resp.variable;
2132         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2133
2134         if (!elems.supp_rates) {
2135                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2136                 return false;
2137         }
2138
2139         ifmgd->aid = aid;
2140
2141         mutex_lock(&sdata->local->sta_mtx);
2142         /*
2143          * station info was already allocated and inserted before
2144          * the association and should be available to us
2145          */
2146         sta = sta_info_get(sdata, cbss->bssid);
2147         if (WARN_ON(!sta)) {
2148                 mutex_unlock(&sdata->local->sta_mtx);
2149                 return false;
2150         }
2151
2152         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2153
2154         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2155                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2156                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2157
2158         sta->supports_40mhz =
2159                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2160
2161         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2162                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2163                                                     elems.vht_cap_elem,
2164                                                     &sta->sta.vht_cap);
2165
2166         rate_control_rate_init(sta);
2167
2168         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2169                 set_sta_flag(sta, WLAN_STA_MFP);
2170
2171         if (elems.wmm_param)
2172                 set_sta_flag(sta, WLAN_STA_WME);
2173
2174         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2175         if (!err)
2176                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2177         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2178                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2179         if (err) {
2180                 sdata_info(sdata,
2181                            "failed to move station %pM to desired state\n",
2182                            sta->sta.addr);
2183                 WARN_ON(__sta_info_destroy(sta));
2184                 mutex_unlock(&sdata->local->sta_mtx);
2185                 return false;
2186         }
2187
2188         mutex_unlock(&sdata->local->sta_mtx);
2189
2190         /*
2191          * Always handle WMM once after association regardless
2192          * of the first value the AP uses. Setting -1 here has
2193          * that effect because the AP values is an unsigned
2194          * 4-bit value.
2195          */
2196         ifmgd->wmm_last_param_set = -1;
2197
2198         if (elems.wmm_param)
2199                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2200                                          elems.wmm_param_len);
2201         else
2202                 ieee80211_set_wmm_default(sdata, false);
2203         changed |= BSS_CHANGED_QOS;
2204
2205         if (elems.ht_operation && elems.wmm_param &&
2206             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2207                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2208                                                   cbss->bssid, false);
2209
2210         /* set AID and assoc capability,
2211          * ieee80211_set_associated() will tell the driver */
2212         bss_conf->aid = aid;
2213         bss_conf->assoc_capability = capab_info;
2214         ieee80211_set_associated(sdata, cbss, changed);
2215
2216         /*
2217          * If we're using 4-addr mode, let the AP know that we're
2218          * doing so, so that it can create the STA VLAN on its side
2219          */
2220         if (ifmgd->use_4addr)
2221                 ieee80211_send_4addr_nullfunc(local, sdata);
2222
2223         /*
2224          * Start timer to probe the connection to the AP now.
2225          * Also start the timer that will detect beacon loss.
2226          */
2227         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2228         ieee80211_sta_reset_beacon_monitor(sdata);
2229
2230         return true;
2231 }
2232
2233 static enum rx_mgmt_action __must_check
2234 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2235                              struct ieee80211_mgmt *mgmt, size_t len,
2236                              struct cfg80211_bss **bss)
2237 {
2238         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2239         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2240         u16 capab_info, status_code, aid;
2241         struct ieee802_11_elems elems;
2242         u8 *pos;
2243         bool reassoc;
2244
2245         lockdep_assert_held(&ifmgd->mtx);
2246
2247         if (!assoc_data)
2248                 return RX_MGMT_NONE;
2249         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2250                 return RX_MGMT_NONE;
2251
2252         /*
2253          * AssocResp and ReassocResp have identical structure, so process both
2254          * of them in this function.
2255          */
2256
2257         if (len < 24 + 6)
2258                 return RX_MGMT_NONE;
2259
2260         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2261         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2262         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2263         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2264
2265         sdata_info(sdata,
2266                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2267                    reassoc ? "Rea" : "A", mgmt->sa,
2268                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2269
2270         pos = mgmt->u.assoc_resp.variable;
2271         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2272
2273         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2274             elems.timeout_int && elems.timeout_int_len == 5 &&
2275             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2276                 u32 tu, ms;
2277                 tu = get_unaligned_le32(elems.timeout_int + 1);
2278                 ms = tu * 1024 / 1000;
2279                 sdata_info(sdata,
2280                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2281                            mgmt->sa, tu, ms);
2282                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2283                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2284                         run_again(ifmgd, assoc_data->timeout);
2285                 return RX_MGMT_NONE;
2286         }
2287
2288         *bss = assoc_data->bss;
2289
2290         if (status_code != WLAN_STATUS_SUCCESS) {
2291                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2292                            mgmt->sa, status_code);
2293                 ieee80211_destroy_assoc_data(sdata, false);
2294         } else {
2295                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2296                         /* oops -- internal error -- send timeout for now */
2297                         ieee80211_destroy_assoc_data(sdata, false);
2298                         cfg80211_put_bss(*bss);
2299                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2300                 }
2301                 sdata_info(sdata, "associated\n");
2302
2303                 /*
2304                  * destroy assoc_data afterwards, as otherwise an idle
2305                  * recalc after assoc_data is NULL but before associated
2306                  * is set can cause the interface to go idle
2307                  */
2308                 ieee80211_destroy_assoc_data(sdata, true);
2309         }
2310
2311         return RX_MGMT_CFG80211_RX_ASSOC;
2312 }
2313 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2314                                   struct ieee80211_mgmt *mgmt,
2315                                   size_t len,
2316                                   struct ieee80211_rx_status *rx_status,
2317                                   struct ieee802_11_elems *elems,
2318                                   bool beacon)
2319 {
2320         struct ieee80211_local *local = sdata->local;
2321         int freq;
2322         struct ieee80211_bss *bss;
2323         struct ieee80211_channel *channel;
2324         bool need_ps = false;
2325
2326         if (sdata->u.mgd.associated &&
2327             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2328                 bss = (void *)sdata->u.mgd.associated->priv;
2329                 /* not previously set so we may need to recalc */
2330                 need_ps = !bss->dtim_period;
2331         }
2332
2333         if (elems->ds_params && elems->ds_params_len == 1)
2334                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2335                                                       rx_status->band);
2336         else
2337                 freq = rx_status->freq;
2338
2339         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2340
2341         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2342                 return;
2343
2344         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2345                                         channel, beacon);
2346         if (bss)
2347                 ieee80211_rx_bss_put(local, bss);
2348
2349         if (!sdata->u.mgd.associated)
2350                 return;
2351
2352         if (need_ps) {
2353                 mutex_lock(&local->iflist_mtx);
2354                 ieee80211_recalc_ps(local, -1);
2355                 mutex_unlock(&local->iflist_mtx);
2356         }
2357
2358         if (elems->ch_switch_ie &&
2359             memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2360                 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2361                                                  bss, rx_status->mactime);
2362 }
2363
2364
2365 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2366                                          struct sk_buff *skb)
2367 {
2368         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2369         struct ieee80211_if_managed *ifmgd;
2370         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2371         size_t baselen, len = skb->len;
2372         struct ieee802_11_elems elems;
2373
2374         ifmgd = &sdata->u.mgd;
2375
2376         ASSERT_MGD_MTX(ifmgd);
2377
2378         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2379                 return; /* ignore ProbeResp to foreign address */
2380
2381         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2382         if (baselen > len)
2383                 return;
2384
2385         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2386                                 &elems);
2387
2388         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2389
2390         if (ifmgd->associated &&
2391             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2392                 ieee80211_reset_ap_probe(sdata);
2393
2394         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2395             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2396                 /* got probe response, continue with auth */
2397                 sdata_info(sdata, "direct probe responded\n");
2398                 ifmgd->auth_data->tries = 0;
2399                 ifmgd->auth_data->timeout = jiffies;
2400                 run_again(ifmgd, ifmgd->auth_data->timeout);
2401         }
2402 }
2403
2404 /*
2405  * This is the canonical list of information elements we care about,
2406  * the filter code also gives us all changes to the Microsoft OUI
2407  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2408  *
2409  * We implement beacon filtering in software since that means we can
2410  * avoid processing the frame here and in cfg80211, and userspace
2411  * will not be able to tell whether the hardware supports it or not.
2412  *
2413  * XXX: This list needs to be dynamic -- userspace needs to be able to
2414  *      add items it requires. It also needs to be able to tell us to
2415  *      look out for other vendor IEs.
2416  */
2417 static const u64 care_about_ies =
2418         (1ULL << WLAN_EID_COUNTRY) |
2419         (1ULL << WLAN_EID_ERP_INFO) |
2420         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2421         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2422         (1ULL << WLAN_EID_HT_CAPABILITY) |
2423         (1ULL << WLAN_EID_HT_OPERATION);
2424
2425 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2426                                      struct ieee80211_mgmt *mgmt,
2427                                      size_t len,
2428                                      struct ieee80211_rx_status *rx_status)
2429 {
2430         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2431         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2432         size_t baselen;
2433         struct ieee802_11_elems elems;
2434         struct ieee80211_local *local = sdata->local;
2435         struct ieee80211_chanctx_conf *chanctx_conf;
2436         struct ieee80211_channel *chan;
2437         u32 changed = 0;
2438         bool erp_valid;
2439         u8 erp_value = 0;
2440         u32 ncrc;
2441         u8 *bssid;
2442
2443         lockdep_assert_held(&ifmgd->mtx);
2444
2445         /* Process beacon from the current BSS */
2446         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2447         if (baselen > len)
2448                 return;
2449
2450         rcu_read_lock();
2451         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2452         if (!chanctx_conf) {
2453                 rcu_read_unlock();
2454                 return;
2455         }
2456
2457         if (rx_status->freq != chanctx_conf->channel->center_freq) {
2458                 rcu_read_unlock();
2459                 return;
2460         }
2461         chan = chanctx_conf->channel;
2462         rcu_read_unlock();
2463
2464         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2465             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2466                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2467                                        len - baselen, &elems);
2468
2469                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2470                                       false);
2471                 ifmgd->assoc_data->have_beacon = true;
2472                 ifmgd->assoc_data->sent_assoc = false;
2473                 /* continue assoc process */
2474                 ifmgd->assoc_data->timeout = jiffies;
2475                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2476                 return;
2477         }
2478
2479         if (!ifmgd->associated ||
2480             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2481                 return;
2482         bssid = ifmgd->associated->bssid;
2483
2484         /* Track average RSSI from the Beacon frames of the current AP */
2485         ifmgd->last_beacon_signal = rx_status->signal;
2486         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2487                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2488                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2489                 ifmgd->last_cqm_event_signal = 0;
2490                 ifmgd->count_beacon_signal = 1;
2491                 ifmgd->last_ave_beacon_signal = 0;
2492         } else {
2493                 ifmgd->ave_beacon_signal =
2494                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2495                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2496                          ifmgd->ave_beacon_signal) / 16;
2497                 ifmgd->count_beacon_signal++;
2498         }
2499
2500         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2501             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2502                 int sig = ifmgd->ave_beacon_signal;
2503                 int last_sig = ifmgd->last_ave_beacon_signal;
2504
2505                 /*
2506                  * if signal crosses either of the boundaries, invoke callback
2507                  * with appropriate parameters
2508                  */
2509                 if (sig > ifmgd->rssi_max_thold &&
2510                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2511                         ifmgd->last_ave_beacon_signal = sig;
2512                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2513                 } else if (sig < ifmgd->rssi_min_thold &&
2514                            (last_sig >= ifmgd->rssi_max_thold ||
2515                            last_sig == 0)) {
2516                         ifmgd->last_ave_beacon_signal = sig;
2517                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2518                 }
2519         }
2520
2521         if (bss_conf->cqm_rssi_thold &&
2522             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2523             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2524                 int sig = ifmgd->ave_beacon_signal / 16;
2525                 int last_event = ifmgd->last_cqm_event_signal;
2526                 int thold = bss_conf->cqm_rssi_thold;
2527                 int hyst = bss_conf->cqm_rssi_hyst;
2528                 if (sig < thold &&
2529                     (last_event == 0 || sig < last_event - hyst)) {
2530                         ifmgd->last_cqm_event_signal = sig;
2531                         ieee80211_cqm_rssi_notify(
2532                                 &sdata->vif,
2533                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2534                                 GFP_KERNEL);
2535                 } else if (sig > thold &&
2536                            (last_event == 0 || sig > last_event + hyst)) {
2537                         ifmgd->last_cqm_event_signal = sig;
2538                         ieee80211_cqm_rssi_notify(
2539                                 &sdata->vif,
2540                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2541                                 GFP_KERNEL);
2542                 }
2543         }
2544
2545         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2546                 mlme_dbg_ratelimited(sdata,
2547                                      "cancelling probereq poll due to a received beacon\n");
2548                 mutex_lock(&local->mtx);
2549                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2550                 ieee80211_run_deferred_scan(local);
2551                 mutex_unlock(&local->mtx);
2552
2553                 mutex_lock(&local->iflist_mtx);
2554                 ieee80211_recalc_ps(local, -1);
2555                 mutex_unlock(&local->iflist_mtx);
2556         }
2557
2558         /*
2559          * Push the beacon loss detection into the future since
2560          * we are processing a beacon from the AP just now.
2561          */
2562         ieee80211_sta_reset_beacon_monitor(sdata);
2563
2564         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2565         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2566                                           len - baselen, &elems,
2567                                           care_about_ies, ncrc);
2568
2569         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2570                 bool directed_tim = ieee80211_check_tim(elems.tim,
2571                                                         elems.tim_len,
2572                                                         ifmgd->aid);
2573                 if (directed_tim) {
2574                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2575                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2576                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2577                                         ieee80211_hw_config(local,
2578                                                             IEEE80211_CONF_CHANGE_PS);
2579                                 }
2580                                 ieee80211_send_nullfunc(local, sdata, 0);
2581                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2582                                 local->pspolling = true;
2583
2584                                 /*
2585                                  * Here is assumed that the driver will be
2586                                  * able to send ps-poll frame and receive a
2587                                  * response even though power save mode is
2588                                  * enabled, but some drivers might require
2589                                  * to disable power save here. This needs
2590                                  * to be investigated.
2591                                  */
2592                                 ieee80211_send_pspoll(local, sdata);
2593                         }
2594                 }
2595         }
2596
2597         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2598                 return;
2599         ifmgd->beacon_crc = ncrc;
2600         ifmgd->beacon_crc_valid = true;
2601
2602         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2603                               true);
2604
2605         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2606                                      elems.wmm_param_len))
2607                 changed |= BSS_CHANGED_QOS;
2608
2609         if (elems.erp_info && elems.erp_info_len >= 1) {
2610                 erp_valid = true;
2611                 erp_value = elems.erp_info[0];
2612         } else {
2613                 erp_valid = false;
2614         }
2615         changed |= ieee80211_handle_bss_capability(sdata,
2616                         le16_to_cpu(mgmt->u.beacon.capab_info),
2617                         erp_valid, erp_value);
2618
2619
2620         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2621             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2622                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2623                                                   bssid, true);
2624
2625         if (elems.country_elem && elems.pwr_constr_elem &&
2626             mgmt->u.probe_resp.capab_info &
2627                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
2628                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
2629                                                        elems.country_elem,
2630                                                        elems.country_elem_len,
2631                                                        elems.pwr_constr_elem);
2632
2633         ieee80211_bss_info_change_notify(sdata, changed);
2634 }
2635
2636 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2637                                   struct sk_buff *skb)
2638 {
2639         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2640         struct ieee80211_rx_status *rx_status;
2641         struct ieee80211_mgmt *mgmt;
2642         struct cfg80211_bss *bss = NULL;
2643         enum rx_mgmt_action rma = RX_MGMT_NONE;
2644         u16 fc;
2645
2646         rx_status = (struct ieee80211_rx_status *) skb->cb;
2647         mgmt = (struct ieee80211_mgmt *) skb->data;
2648         fc = le16_to_cpu(mgmt->frame_control);
2649
2650         mutex_lock(&ifmgd->mtx);
2651
2652         switch (fc & IEEE80211_FCTL_STYPE) {
2653         case IEEE80211_STYPE_BEACON:
2654                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2655                 break;
2656         case IEEE80211_STYPE_PROBE_RESP:
2657                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2658                 break;
2659         case IEEE80211_STYPE_AUTH:
2660                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2661                 break;
2662         case IEEE80211_STYPE_DEAUTH:
2663                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2664                 break;
2665         case IEEE80211_STYPE_DISASSOC:
2666                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2667                 break;
2668         case IEEE80211_STYPE_ASSOC_RESP:
2669         case IEEE80211_STYPE_REASSOC_RESP:
2670                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2671                 break;
2672         case IEEE80211_STYPE_ACTION:
2673                 switch (mgmt->u.action.category) {
2674                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2675                         ieee80211_sta_process_chanswitch(sdata,
2676                                         &mgmt->u.action.u.chan_switch.sw_elem,
2677                                         (void *)ifmgd->associated->priv,
2678                                         rx_status->mactime);
2679                         break;
2680                 }
2681         }
2682         mutex_unlock(&ifmgd->mtx);
2683
2684         switch (rma) {
2685         case RX_MGMT_NONE:
2686                 /* no action */
2687                 break;
2688         case RX_MGMT_CFG80211_DEAUTH:
2689                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2690                 break;
2691         case RX_MGMT_CFG80211_DISASSOC:
2692                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2693                 break;
2694         case RX_MGMT_CFG80211_RX_AUTH:
2695                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2696                 break;
2697         case RX_MGMT_CFG80211_RX_ASSOC:
2698                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2699                 break;
2700         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2701                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2702                 break;
2703         default:
2704                 WARN(1, "unexpected: %d", rma);
2705         }
2706 }
2707
2708 static void ieee80211_sta_timer(unsigned long data)
2709 {
2710         struct ieee80211_sub_if_data *sdata =
2711                 (struct ieee80211_sub_if_data *) data;
2712         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2713         struct ieee80211_local *local = sdata->local;
2714
2715         if (local->quiescing) {
2716                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2717                 return;
2718         }
2719
2720         ieee80211_queue_work(&local->hw, &sdata->work);
2721 }
2722
2723 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2724                                           u8 *bssid, u8 reason)
2725 {
2726         struct ieee80211_local *local = sdata->local;
2727         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2728         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2729
2730         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2731                                false, frame_buf);
2732         mutex_unlock(&ifmgd->mtx);
2733
2734         /*
2735          * must be outside lock due to cfg80211,
2736          * but that's not a problem.
2737          */
2738         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2739
2740         mutex_lock(&local->mtx);
2741         ieee80211_recalc_idle(local);
2742         mutex_unlock(&local->mtx);
2743
2744         mutex_lock(&ifmgd->mtx);
2745 }
2746
2747 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2748 {
2749         struct ieee80211_local *local = sdata->local;
2750         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2751         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2752
2753         lockdep_assert_held(&ifmgd->mtx);
2754
2755         if (WARN_ON_ONCE(!auth_data))
2756                 return -EINVAL;
2757
2758         auth_data->tries++;
2759
2760         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2761                 sdata_info(sdata, "authentication with %pM timed out\n",
2762                            auth_data->bss->bssid);
2763
2764                 /*
2765                  * Most likely AP is not in the range so remove the
2766                  * bss struct for that AP.
2767                  */
2768                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2769
2770                 return -ETIMEDOUT;
2771         }
2772
2773         drv_mgd_prepare_tx(local, sdata);
2774
2775         if (auth_data->bss->proberesp_ies) {
2776                 u16 trans = 1;
2777                 u16 status = 0;
2778
2779                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2780                            auth_data->bss->bssid, auth_data->tries,
2781                            IEEE80211_AUTH_MAX_TRIES);
2782
2783                 auth_data->expected_transaction = 2;
2784
2785                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
2786                         trans = auth_data->sae_trans;
2787                         status = auth_data->sae_status;
2788                         auth_data->expected_transaction = trans;
2789                 }
2790
2791                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
2792                                     auth_data->data, auth_data->data_len,
2793                                     auth_data->bss->bssid,
2794                                     auth_data->bss->bssid, NULL, 0, 0);
2795         } else {
2796                 const u8 *ssidie;
2797
2798                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2799                            auth_data->bss->bssid, auth_data->tries,
2800                            IEEE80211_AUTH_MAX_TRIES);
2801
2802                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2803                 if (!ssidie)
2804                         return -EINVAL;
2805                 /*
2806                  * Direct probe is sent to broadcast address as some APs
2807                  * will not answer to direct packet in unassociated state.
2808                  */
2809                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2810                                          NULL, 0, (u32) -1, true, false,
2811                                          auth_data->bss->channel, false);
2812         }
2813
2814         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2815         run_again(ifmgd, auth_data->timeout);
2816
2817         return 0;
2818 }
2819
2820 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2821 {
2822         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2823         struct ieee80211_local *local = sdata->local;
2824
2825         lockdep_assert_held(&sdata->u.mgd.mtx);
2826
2827         assoc_data->tries++;
2828         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2829                 sdata_info(sdata, "association with %pM timed out\n",
2830                            assoc_data->bss->bssid);
2831
2832                 /*
2833                  * Most likely AP is not in the range so remove the
2834                  * bss struct for that AP.
2835                  */
2836                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2837
2838                 return -ETIMEDOUT;
2839         }
2840
2841         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2842                    assoc_data->bss->bssid, assoc_data->tries,
2843                    IEEE80211_ASSOC_MAX_TRIES);
2844         ieee80211_send_assoc(sdata);
2845
2846         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2847         run_again(&sdata->u.mgd, assoc_data->timeout);
2848
2849         return 0;
2850 }
2851
2852 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2853 {
2854         struct ieee80211_local *local = sdata->local;
2855         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2856
2857         mutex_lock(&ifmgd->mtx);
2858
2859         if (ifmgd->auth_data &&
2860             time_after(jiffies, ifmgd->auth_data->timeout)) {
2861                 if (ifmgd->auth_data->done) {
2862                         /*
2863                          * ok ... we waited for assoc but userspace didn't,
2864                          * so let's just kill the auth data
2865                          */
2866                         ieee80211_destroy_auth_data(sdata, false);
2867                 } else if (ieee80211_probe_auth(sdata)) {
2868                         u8 bssid[ETH_ALEN];
2869
2870                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2871
2872                         ieee80211_destroy_auth_data(sdata, false);
2873
2874                         mutex_unlock(&ifmgd->mtx);
2875                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2876                         mutex_lock(&ifmgd->mtx);
2877                 }
2878         } else if (ifmgd->auth_data)
2879                 run_again(ifmgd, ifmgd->auth_data->timeout);
2880
2881         if (ifmgd->assoc_data &&
2882             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2883                 if (!ifmgd->assoc_data->have_beacon ||
2884                     ieee80211_do_assoc(sdata)) {
2885                         u8 bssid[ETH_ALEN];
2886
2887                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2888
2889                         ieee80211_destroy_assoc_data(sdata, false);
2890
2891                         mutex_unlock(&ifmgd->mtx);
2892                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2893                         mutex_lock(&ifmgd->mtx);
2894                 }
2895         } else if (ifmgd->assoc_data)
2896                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2897
2898         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2899                             IEEE80211_STA_CONNECTION_POLL) &&
2900             ifmgd->associated) {
2901                 u8 bssid[ETH_ALEN];
2902                 int max_tries;
2903
2904                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2905
2906                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2907                         max_tries = max_nullfunc_tries;
2908                 else
2909                         max_tries = max_probe_tries;
2910
2911                 /* ACK received for nullfunc probing frame */
2912                 if (!ifmgd->probe_send_count)
2913                         ieee80211_reset_ap_probe(sdata);
2914                 else if (ifmgd->nullfunc_failed) {
2915                         if (ifmgd->probe_send_count < max_tries) {
2916                                 mlme_dbg(sdata,
2917                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2918                                          bssid, ifmgd->probe_send_count,
2919                                          max_tries);
2920                                 ieee80211_mgd_probe_ap_send(sdata);
2921                         } else {
2922                                 mlme_dbg(sdata,
2923                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2924                                          bssid);
2925                                 ieee80211_sta_connection_lost(sdata, bssid,
2926                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2927                         }
2928                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2929                         run_again(ifmgd, ifmgd->probe_timeout);
2930                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2931                         mlme_dbg(sdata,
2932                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2933                                  bssid, probe_wait_ms);
2934                         ieee80211_sta_connection_lost(sdata, bssid,
2935                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2936                 } else if (ifmgd->probe_send_count < max_tries) {
2937                         mlme_dbg(sdata,
2938                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2939                                  bssid, probe_wait_ms,
2940                                  ifmgd->probe_send_count, max_tries);
2941                         ieee80211_mgd_probe_ap_send(sdata);
2942                 } else {
2943                         /*
2944                          * We actually lost the connection ... or did we?
2945                          * Let's make sure!
2946                          */
2947                         wiphy_debug(local->hw.wiphy,
2948                                     "%s: No probe response from AP %pM"
2949                                     " after %dms, disconnecting.\n",
2950                                     sdata->name,
2951                                     bssid, probe_wait_ms);
2952
2953                         ieee80211_sta_connection_lost(sdata, bssid,
2954                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2955                 }
2956         }
2957
2958         mutex_unlock(&ifmgd->mtx);
2959
2960         mutex_lock(&local->mtx);
2961         ieee80211_recalc_idle(local);
2962         mutex_unlock(&local->mtx);
2963 }
2964
2965 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2966 {
2967         struct ieee80211_sub_if_data *sdata =
2968                 (struct ieee80211_sub_if_data *) data;
2969         struct ieee80211_local *local = sdata->local;
2970
2971         if (local->quiescing)
2972                 return;
2973
2974         ieee80211_queue_work(&sdata->local->hw,
2975                              &sdata->u.mgd.beacon_connection_loss_work);
2976 }
2977
2978 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2979 {
2980         struct ieee80211_sub_if_data *sdata =
2981                 (struct ieee80211_sub_if_data *) data;
2982         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2983         struct ieee80211_local *local = sdata->local;
2984
2985         if (local->quiescing)
2986                 return;
2987
2988         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2989 }
2990
2991 static void ieee80211_sta_monitor_work(struct work_struct *work)
2992 {
2993         struct ieee80211_sub_if_data *sdata =
2994                 container_of(work, struct ieee80211_sub_if_data,
2995                              u.mgd.monitor_work);
2996
2997         ieee80211_mgd_probe_ap(sdata, false);
2998 }
2999
3000 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3001 {
3002         u32 flags;
3003
3004         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3005                 __ieee80211_stop_poll(sdata);
3006
3007                 /* let's probe the connection once */
3008                 flags = sdata->local->hw.flags;
3009                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3010                         ieee80211_queue_work(&sdata->local->hw,
3011                                              &sdata->u.mgd.monitor_work);
3012                 /* and do all the other regular work too */
3013                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3014         }
3015 }
3016
3017 #ifdef CONFIG_PM
3018 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
3019 {
3020         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3021
3022         /*
3023          * we need to use atomic bitops for the running bits
3024          * only because both timers might fire at the same
3025          * time -- the code here is properly synchronised.
3026          */
3027
3028         cancel_work_sync(&ifmgd->request_smps_work);
3029
3030         cancel_work_sync(&ifmgd->monitor_work);
3031         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
3032         cancel_work_sync(&ifmgd->csa_connection_drop_work);
3033         if (del_timer_sync(&ifmgd->timer))
3034                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
3035
3036         cancel_work_sync(&ifmgd->chswitch_work);
3037         if (del_timer_sync(&ifmgd->chswitch_timer))
3038                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
3039
3040         /* these will just be re-established on connection */
3041         del_timer_sync(&ifmgd->conn_mon_timer);
3042         del_timer_sync(&ifmgd->bcn_mon_timer);
3043 }
3044
3045 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3046 {
3047         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3048
3049         if (!ifmgd->associated)
3050                 return;
3051
3052         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3053                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3054                 mutex_lock(&ifmgd->mtx);
3055                 if (ifmgd->associated) {
3056                         mlme_dbg(sdata,
3057                                  "driver requested disconnect after resume\n");
3058                         ieee80211_sta_connection_lost(sdata,
3059                                 ifmgd->associated->bssid,
3060                                 WLAN_REASON_UNSPECIFIED);
3061                         mutex_unlock(&ifmgd->mtx);
3062                         return;
3063                 }
3064                 mutex_unlock(&ifmgd->mtx);
3065         }
3066
3067         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
3068                 add_timer(&ifmgd->timer);
3069         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
3070                 add_timer(&ifmgd->chswitch_timer);
3071         ieee80211_sta_reset_beacon_monitor(sdata);
3072
3073         mutex_lock(&sdata->local->mtx);
3074         ieee80211_restart_sta_timer(sdata);
3075         mutex_unlock(&sdata->local->mtx);
3076 }
3077 #endif
3078
3079 /* interface setup */
3080 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3081 {
3082         struct ieee80211_if_managed *ifmgd;
3083
3084         ifmgd = &sdata->u.mgd;
3085         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3086         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3087         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3088                   ieee80211_beacon_connection_loss_work);
3089         INIT_WORK(&ifmgd->csa_connection_drop_work,
3090                   ieee80211_csa_connection_drop_work);
3091         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3092         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3093                     (unsigned long) sdata);
3094         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3095                     (unsigned long) sdata);
3096         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3097                     (unsigned long) sdata);
3098         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3099                     (unsigned long) sdata);
3100
3101         ifmgd->flags = 0;
3102         ifmgd->powersave = sdata->wdev.ps;
3103         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3104         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3105
3106         mutex_init(&ifmgd->mtx);
3107
3108         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3109                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3110         else
3111                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3112 }
3113
3114 /* scan finished notification */
3115 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3116 {
3117         struct ieee80211_sub_if_data *sdata;
3118
3119         /* Restart STA timers */
3120         rcu_read_lock();
3121         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3122                 ieee80211_restart_sta_timer(sdata);
3123         rcu_read_unlock();
3124 }
3125
3126 int ieee80211_max_network_latency(struct notifier_block *nb,
3127                                   unsigned long data, void *dummy)
3128 {
3129         s32 latency_usec = (s32) data;
3130         struct ieee80211_local *local =
3131                 container_of(nb, struct ieee80211_local,
3132                              network_latency_notifier);
3133
3134         mutex_lock(&local->iflist_mtx);
3135         ieee80211_recalc_ps(local, latency_usec);
3136         mutex_unlock(&local->iflist_mtx);
3137
3138         return 0;
3139 }
3140
3141 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3142                                   struct cfg80211_bss *cbss)
3143 {
3144         struct ieee80211_local *local = sdata->local;
3145         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3146         int ht_cfreq;
3147         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3148         const u8 *ht_oper_ie;
3149         const struct ieee80211_ht_operation *ht_oper = NULL;
3150         struct ieee80211_supported_band *sband;
3151
3152         sband = local->hw.wiphy->bands[cbss->channel->band];
3153
3154         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3155
3156         if (sband->ht_cap.ht_supported) {
3157                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3158                                               cbss->information_elements,
3159                                               cbss->len_information_elements);
3160                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3161                         ht_oper = (void *)(ht_oper_ie + 2);
3162         }
3163
3164         if (ht_oper) {
3165                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3166                                                           cbss->channel->band);
3167                 /* check that channel matches the right operating channel */
3168                 if (cbss->channel->center_freq != ht_cfreq) {
3169                         /*
3170                          * It's possible that some APs are confused here;
3171                          * Netgear WNDR3700 sometimes reports 4 higher than
3172                          * the actual channel in association responses, but
3173                          * since we look at probe response/beacon data here
3174                          * it should be OK.
3175                          */
3176                         sdata_info(sdata,
3177                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3178                                    cbss->channel->center_freq,
3179                                    ht_cfreq, ht_oper->primary_chan,
3180                                    cbss->channel->band);
3181                         ht_oper = NULL;
3182                 } else {
3183                         channel_type = NL80211_CHAN_HT20;
3184                 }
3185         }
3186
3187         if (ht_oper && sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3188                 /*
3189                  * cfg80211 already verified that the channel itself can
3190                  * be used, but it didn't check that we can do the right
3191                  * HT type, so do that here as well. If HT40 isn't allowed
3192                  * on this channel, disable 40 MHz operation.
3193                  */
3194                 const u8 *ht_cap_ie;
3195                 const struct ieee80211_ht_cap *ht_cap;
3196                 u8 chains = 1;
3197
3198                 channel_type = NL80211_CHAN_HT20;
3199
3200                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3201                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3202                         if (cbss->channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
3203                                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3204                         else
3205                                 channel_type = NL80211_CHAN_HT40PLUS;
3206                         break;
3207                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3208                         if (cbss->channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
3209                                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3210                         else
3211                                 channel_type = NL80211_CHAN_HT40MINUS;
3212                         break;
3213                 }
3214
3215                 ht_cap_ie = cfg80211_find_ie(WLAN_EID_HT_CAPABILITY,
3216                                              cbss->information_elements,
3217                                              cbss->len_information_elements);
3218                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3219                         ht_cap = (void *)(ht_cap_ie + 2);
3220                         chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3221                 }
3222                 sdata->needed_rx_chains = min(chains, local->rx_chains);
3223         } else {
3224                 sdata->needed_rx_chains = 1;
3225         }
3226
3227         /* will change later if needed */
3228         sdata->smps_mode = IEEE80211_SMPS_OFF;
3229
3230         ieee80211_vif_release_channel(sdata);
3231         return ieee80211_vif_use_channel(sdata, cbss->channel, channel_type,
3232                                          IEEE80211_CHANCTX_SHARED);
3233 }
3234
3235 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3236                                      struct cfg80211_bss *cbss, bool assoc)
3237 {
3238         struct ieee80211_local *local = sdata->local;
3239         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3240         struct ieee80211_bss *bss = (void *)cbss->priv;
3241         struct sta_info *new_sta = NULL;
3242         bool have_sta = false;
3243         int err;
3244
3245         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3246                 return -EINVAL;
3247
3248         if (assoc) {
3249                 rcu_read_lock();
3250                 have_sta = sta_info_get(sdata, cbss->bssid);
3251                 rcu_read_unlock();
3252         }
3253
3254         if (!have_sta) {
3255                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3256                 if (!new_sta)
3257                         return -ENOMEM;
3258         }
3259
3260         mutex_lock(&local->mtx);
3261         ieee80211_recalc_idle(sdata->local);
3262         mutex_unlock(&local->mtx);
3263
3264         if (new_sta) {
3265                 u32 rates = 0, basic_rates = 0;
3266                 bool have_higher_than_11mbit;
3267                 int min_rate = INT_MAX, min_rate_index = -1;
3268                 struct ieee80211_supported_band *sband;
3269
3270                 sband = local->hw.wiphy->bands[cbss->channel->band];
3271
3272                 err = ieee80211_prep_channel(sdata, cbss);
3273                 if (err) {
3274                         sta_info_free(local, new_sta);
3275                         return err;
3276                 }
3277
3278                 ieee80211_get_rates(sband, bss->supp_rates,
3279                                     bss->supp_rates_len,
3280                                     &rates, &basic_rates,
3281                                     &have_higher_than_11mbit,
3282                                     &min_rate, &min_rate_index);
3283
3284                 /*
3285                  * This used to be a workaround for basic rates missing
3286                  * in the association response frame. Now that we no
3287                  * longer use the basic rates from there, it probably
3288                  * doesn't happen any more, but keep the workaround so
3289                  * in case some *other* APs are buggy in different ways
3290                  * we can connect -- with a warning.
3291                  */
3292                 if (!basic_rates && min_rate_index >= 0) {
3293                         sdata_info(sdata,
3294                                    "No basic rates, using min rate instead\n");
3295                         basic_rates = BIT(min_rate_index);
3296                 }
3297
3298                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3299                 sdata->vif.bss_conf.basic_rates = basic_rates;
3300
3301                 /* cf. IEEE 802.11 9.2.12 */
3302                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3303                     have_higher_than_11mbit)
3304                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3305                 else
3306                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3307
3308                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3309
3310                 /* set timing information */
3311                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3312                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3313                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3314
3315                 /* tell driver about BSSID, basic rates and timing */
3316                 ieee80211_bss_info_change_notify(sdata,
3317                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3318                         BSS_CHANGED_BEACON_INT);
3319
3320                 if (assoc)
3321                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3322
3323                 err = sta_info_insert(new_sta);
3324                 new_sta = NULL;
3325                 if (err) {
3326                         sdata_info(sdata,
3327                                    "failed to insert STA entry for the AP (error %d)\n",
3328                                    err);
3329                         return err;
3330                 }
3331         } else
3332                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3333
3334         return 0;
3335 }
3336
3337 /* config hooks */
3338 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3339                        struct cfg80211_auth_request *req)
3340 {
3341         struct ieee80211_local *local = sdata->local;
3342         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3343         struct ieee80211_mgd_auth_data *auth_data;
3344         u16 auth_alg;
3345         int err;
3346
3347         /* prepare auth data structure */
3348
3349         switch (req->auth_type) {
3350         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3351                 auth_alg = WLAN_AUTH_OPEN;
3352                 break;
3353         case NL80211_AUTHTYPE_SHARED_KEY:
3354                 if (IS_ERR(local->wep_tx_tfm))
3355                         return -EOPNOTSUPP;
3356                 auth_alg = WLAN_AUTH_SHARED_KEY;
3357                 break;
3358         case NL80211_AUTHTYPE_FT:
3359                 auth_alg = WLAN_AUTH_FT;
3360                 break;
3361         case NL80211_AUTHTYPE_NETWORK_EAP:
3362                 auth_alg = WLAN_AUTH_LEAP;
3363                 break;
3364         case NL80211_AUTHTYPE_SAE:
3365                 auth_alg = WLAN_AUTH_SAE;
3366                 break;
3367         default:
3368                 return -EOPNOTSUPP;
3369         }
3370
3371         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3372                             req->ie_len, GFP_KERNEL);
3373         if (!auth_data)
3374                 return -ENOMEM;
3375
3376         auth_data->bss = req->bss;
3377
3378         if (req->sae_data_len >= 4) {
3379                 __le16 *pos = (__le16 *) req->sae_data;
3380                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3381                 auth_data->sae_status = le16_to_cpu(pos[1]);
3382                 memcpy(auth_data->data, req->sae_data + 4,
3383                        req->sae_data_len - 4);
3384                 auth_data->data_len += req->sae_data_len - 4;
3385         }
3386
3387         if (req->ie && req->ie_len) {
3388                 memcpy(&auth_data->data[auth_data->data_len],
3389                        req->ie, req->ie_len);
3390                 auth_data->data_len += req->ie_len;
3391         }
3392
3393         if (req->key && req->key_len) {
3394                 auth_data->key_len = req->key_len;
3395                 auth_data->key_idx = req->key_idx;
3396                 memcpy(auth_data->key, req->key, req->key_len);
3397         }
3398
3399         auth_data->algorithm = auth_alg;
3400
3401         /* try to authenticate/probe */
3402
3403         mutex_lock(&ifmgd->mtx);
3404
3405         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3406             ifmgd->assoc_data) {
3407                 err = -EBUSY;
3408                 goto err_free;
3409         }
3410
3411         if (ifmgd->auth_data)
3412                 ieee80211_destroy_auth_data(sdata, false);
3413
3414         /* prep auth_data so we don't go into idle on disassoc */
3415         ifmgd->auth_data = auth_data;
3416
3417         if (ifmgd->associated)
3418                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3419
3420         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3421
3422         err = ieee80211_prep_connection(sdata, req->bss, false);
3423         if (err)
3424                 goto err_clear;
3425
3426         err = ieee80211_probe_auth(sdata);
3427         if (err) {
3428                 sta_info_destroy_addr(sdata, req->bss->bssid);
3429                 goto err_clear;
3430         }
3431
3432         /* hold our own reference */
3433         cfg80211_ref_bss(auth_data->bss);
3434         err = 0;
3435         goto out_unlock;
3436
3437  err_clear:
3438         memset(ifmgd->bssid, 0, ETH_ALEN);
3439         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3440         ifmgd->auth_data = NULL;
3441  err_free:
3442         kfree(auth_data);
3443  out_unlock:
3444         mutex_unlock(&ifmgd->mtx);
3445
3446         return err;
3447 }
3448
3449 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3450                         struct cfg80211_assoc_request *req)
3451 {
3452         struct ieee80211_local *local = sdata->local;
3453         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3454         struct ieee80211_bss *bss = (void *)req->bss->priv;
3455         struct ieee80211_mgd_assoc_data *assoc_data;
3456         struct ieee80211_supported_band *sband;
3457         const u8 *ssidie, *ht_ie;
3458         int i, err;
3459
3460         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3461         if (!ssidie)
3462                 return -EINVAL;
3463
3464         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3465         if (!assoc_data)
3466                 return -ENOMEM;
3467
3468         mutex_lock(&ifmgd->mtx);
3469
3470         if (ifmgd->associated)
3471                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3472
3473         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3474                 err = -EBUSY;
3475                 goto err_free;
3476         }
3477
3478         if (ifmgd->assoc_data) {
3479                 err = -EBUSY;
3480                 goto err_free;
3481         }
3482
3483         if (ifmgd->auth_data) {
3484                 bool match;
3485
3486                 /* keep sta info, bssid if matching */
3487                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3488                 ieee80211_destroy_auth_data(sdata, match);
3489         }
3490
3491         /* prepare assoc data */
3492
3493         /*
3494          * keep only the 40 MHz disable bit set as it might have
3495          * been set during authentication already, all other bits
3496          * should be reset for a new connection
3497          */
3498         ifmgd->flags &= IEEE80211_STA_DISABLE_40MHZ;
3499
3500         ifmgd->beacon_crc_valid = false;
3501
3502         /*
3503          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3504          * We still associate in non-HT mode (11a/b/g) if any one of these
3505          * ciphers is configured as pairwise.
3506          * We can set this to true for non-11n hardware, that'll be checked
3507          * separately along with the peer capabilities.
3508          */
3509         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3510                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3511                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3512                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3513                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3514                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3515                         netdev_info(sdata->dev,
3516                                     "disabling HT/VHT due to WEP/TKIP use\n");
3517                 }
3518         }
3519
3520         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3521                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3522                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3523         }
3524
3525         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3526         sband = local->hw.wiphy->bands[req->bss->channel->band];
3527         if (!sband->ht_cap.ht_supported ||
3528             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3529                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3530                 if (!bss->wmm_used)
3531                         netdev_info(sdata->dev,
3532                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3533         }
3534
3535         /* disable VHT if we don't support it or the AP doesn't use WMM */
3536         if (!sband->vht_cap.vht_supported ||
3537             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3538                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3539                 if (!bss->wmm_used)
3540                         netdev_info(sdata->dev,
3541                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3542         }
3543
3544         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3545         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3546                sizeof(ifmgd->ht_capa_mask));
3547
3548         if (req->ie && req->ie_len) {
3549                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3550                 assoc_data->ie_len = req->ie_len;
3551         }
3552
3553         assoc_data->bss = req->bss;
3554
3555         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3556                 if (ifmgd->powersave)
3557                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
3558                 else
3559                         sdata->smps_mode = IEEE80211_SMPS_OFF;
3560         } else
3561                 sdata->smps_mode = ifmgd->req_smps;
3562
3563         assoc_data->capability = req->bss->capability;
3564         assoc_data->wmm = bss->wmm_used &&
3565                           (local->hw.queues >= IEEE80211_NUM_ACS);
3566         assoc_data->supp_rates = bss->supp_rates;
3567         assoc_data->supp_rates_len = bss->supp_rates_len;
3568
3569         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3570         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3571                 assoc_data->ap_ht_param =
3572                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3573         else
3574                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3575
3576         if (bss->wmm_used && bss->uapsd_supported &&
3577             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3578                 assoc_data->uapsd = true;
3579                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3580         } else {
3581                 assoc_data->uapsd = false;
3582                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3583         }
3584
3585         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3586         assoc_data->ssid_len = ssidie[1];
3587
3588         if (req->prev_bssid)
3589                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3590
3591         if (req->use_mfp) {
3592                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3593                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3594         } else {
3595                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3596                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3597         }
3598
3599         if (req->crypto.control_port)
3600                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3601         else
3602                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3603
3604         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3605         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3606
3607         /* kick off associate process */
3608
3609         ifmgd->assoc_data = assoc_data;
3610
3611         err = ieee80211_prep_connection(sdata, req->bss, true);
3612         if (err)
3613                 goto err_clear;
3614
3615         if (!bss->dtim_period &&
3616             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3617                 /*
3618                  * Wait up to one beacon interval ...
3619                  * should this be more if we miss one?
3620                  */
3621                 sdata_info(sdata, "waiting for beacon from %pM\n",
3622                            ifmgd->bssid);
3623                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3624         } else {
3625                 assoc_data->have_beacon = true;
3626                 assoc_data->sent_assoc = false;
3627                 assoc_data->timeout = jiffies;
3628         }
3629         run_again(ifmgd, assoc_data->timeout);
3630
3631         if (bss->corrupt_data) {
3632                 char *corrupt_type = "data";
3633                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3634                         if (bss->corrupt_data &
3635                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3636                                 corrupt_type = "beacon and probe response";
3637                         else
3638                                 corrupt_type = "beacon";
3639                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3640                         corrupt_type = "probe response";
3641                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3642                            corrupt_type);
3643         }
3644
3645         err = 0;
3646         goto out;
3647  err_clear:
3648         memset(ifmgd->bssid, 0, ETH_ALEN);
3649         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3650         ifmgd->assoc_data = NULL;
3651  err_free:
3652         kfree(assoc_data);
3653  out:
3654         mutex_unlock(&ifmgd->mtx);
3655
3656         return err;
3657 }
3658
3659 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3660                          struct cfg80211_deauth_request *req)
3661 {
3662         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3663         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3664         bool tx = !req->local_state_change;
3665         bool sent_frame = false;
3666
3667         mutex_lock(&ifmgd->mtx);
3668
3669         sdata_info(sdata,
3670                    "deauthenticating from %pM by local choice (reason=%d)\n",
3671                    req->bssid, req->reason_code);
3672
3673         if (ifmgd->auth_data) {
3674                 drv_mgd_prepare_tx(sdata->local, sdata);
3675                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3676                                                IEEE80211_STYPE_DEAUTH,
3677                                                req->reason_code, tx,
3678                                                frame_buf);
3679                 ieee80211_destroy_auth_data(sdata, false);
3680                 mutex_unlock(&ifmgd->mtx);
3681
3682                 sent_frame = tx;
3683                 goto out;
3684         }
3685
3686         if (ifmgd->associated &&
3687             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3688                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3689                                        req->reason_code, tx, frame_buf);
3690                 sent_frame = tx;
3691         }
3692         mutex_unlock(&ifmgd->mtx);
3693
3694  out:
3695         mutex_lock(&sdata->local->mtx);
3696         ieee80211_recalc_idle(sdata->local);
3697         mutex_unlock(&sdata->local->mtx);
3698
3699         if (sent_frame)
3700                 __cfg80211_send_deauth(sdata->dev, frame_buf,
3701                                        IEEE80211_DEAUTH_FRAME_LEN);
3702
3703         return 0;
3704 }
3705
3706 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3707                            struct cfg80211_disassoc_request *req)
3708 {
3709         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3710         u8 bssid[ETH_ALEN];
3711         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3712
3713         mutex_lock(&ifmgd->mtx);
3714
3715         /*
3716          * cfg80211 should catch this ... but it's racy since
3717          * we can receive a disassoc frame, process it, hand it
3718          * to cfg80211 while that's in a locked section already
3719          * trying to tell us that the user wants to disconnect.
3720          */
3721         if (ifmgd->associated != req->bss) {
3722                 mutex_unlock(&ifmgd->mtx);
3723                 return -ENOLINK;
3724         }
3725
3726         sdata_info(sdata,
3727                    "disassociating from %pM by local choice (reason=%d)\n",
3728                    req->bss->bssid, req->reason_code);
3729
3730         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3731         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3732                                req->reason_code, !req->local_state_change,
3733                                frame_buf);
3734         mutex_unlock(&ifmgd->mtx);
3735
3736         __cfg80211_send_disassoc(sdata->dev, frame_buf,
3737                                  IEEE80211_DEAUTH_FRAME_LEN);
3738
3739         mutex_lock(&sdata->local->mtx);
3740         ieee80211_recalc_idle(sdata->local);
3741         mutex_unlock(&sdata->local->mtx);
3742
3743         return 0;
3744 }
3745
3746 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3747 {
3748         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3749
3750         mutex_lock(&ifmgd->mtx);
3751         if (ifmgd->assoc_data)
3752                 ieee80211_destroy_assoc_data(sdata, false);
3753         if (ifmgd->auth_data)
3754                 ieee80211_destroy_auth_data(sdata, false);
3755         del_timer_sync(&ifmgd->timer);
3756         mutex_unlock(&ifmgd->mtx);
3757 }
3758
3759 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3760                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3761                                gfp_t gfp)
3762 {
3763         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3764
3765         trace_api_cqm_rssi_notify(sdata, rssi_event);
3766
3767         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3768 }
3769 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);