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