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         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 150                 return;
 151
 152         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 153                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 154 }
 155
 156 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 157 {
 158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 159
 160         if (unlikely(!sdata->u.mgd.associated))
 161                 return;
 162
 163         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 164                 return;
 165
 166         mod_timer(&sdata->u.mgd.conn_mon_timer,
 167                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 168
 169         ifmgd->probe_send_count = 0;
 170 }
 171
 172 static int ecw2cw(int ecw)
 173 {
 174         return (1 << ecw) - 1;
 175 }
 176
 177 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
 178                                   struct ieee80211_ht_operation *ht_oper,
 179                                   const u8 *bssid, bool reconfig)
 180 {
 181         struct ieee80211_local *local = sdata->local;
 182         struct ieee80211_supported_band *sband;
 183         struct sta_info *sta;
 184         u32 changed = 0;
 185         u16 ht_opmode;
 186         bool disable_40 = false;
 187
 188         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 189
 190         switch (sdata->vif.bss_conf.channel_type) {
 191         case NL80211_CHAN_HT40PLUS:
 192                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 193                         disable_40 = true;
 194                 break;
 195         case NL80211_CHAN_HT40MINUS:
 196                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
 197                         disable_40 = true;
 198                 break;
 199         default:
 200                 break;
 201         }
 202
 203         /* This can change during the lifetime of the BSS */
 204         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 205                 disable_40 = true;
 206
 207         mutex_lock(&local->sta_mtx);
 208         sta = sta_info_get(sdata, bssid);
 209
 210         WARN_ON_ONCE(!sta);
 211
 212         if (sta && !sta->supports_40mhz)
 213                 disable_40 = true;
 214
 215         if (sta && (!reconfig ||
 216                     (disable_40 != !(sta->sta.ht_cap.cap &
 217                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 218
 219                 if (disable_40)
 220                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 221                 else
 222                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 223
 224                 rate_control_rate_update(local, sband, sta,
 225                                          IEEE80211_RC_BW_CHANGED);
 226         }
 227         mutex_unlock(&local->sta_mtx);
 228
 229         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 230
 231         /* if bss configuration changed store the new one */
 232         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 233                 changed |= BSS_CHANGED_HT;
 234                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 235         }
 236
 237         return changed;
 238 }
 239
 240 /* frame sending functions */
 241
 242 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 243                                       struct ieee80211_supported_band *sband,
 244                                       u32 *rates)
 245 {
 246         int i, j, count;
 247         *rates = 0;
 248         count = 0;
 249         for (i = 0; i < supp_rates_len; i++) {
 250                 int rate = (supp_rates[i] & 0x7F) * 5;
 251
 252                 for (j = 0; j < sband->n_bitrates; j++)
 253                         if (sband->bitrates[j].bitrate == rate) {
 254                                 *rates |= BIT(j);
 255                                 count++;
 256                                 break;
 257                         }
 258         }
 259
 260         return count;
 261 }
 262
 263 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 264                                 struct sk_buff *skb, u8 ap_ht_param,
 265                                 struct ieee80211_supported_band *sband,
 266                                 struct ieee80211_channel *channel,
 267                                 enum ieee80211_smps_mode smps)
 268 {
 269         u8 *pos;
 270         u32 flags = channel->flags;
 271         u16 cap;
 272         struct ieee80211_sta_ht_cap ht_cap;
 273
 274         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 275
 276         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 277         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 278
 279         /* determine capability flags */
 280         cap = ht_cap.cap;
 281
 282         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 283         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 284                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 285                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 286                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 287                 }
 288                 break;
 289         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 290                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 291                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 292                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 293                 }
 294                 break;
 295         }
 296
 297         /*
 298          * If 40 MHz was disabled associate as though we weren't
 299          * capable of 40 MHz -- some broken APs will never fall
 300          * back to trying to transmit in 20 MHz.
 301          */
 302         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 303                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 304                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 305         }
 306
 307         /* set SM PS mode properly */
 308         cap &= ~IEEE80211_HT_CAP_SM_PS;
 309         switch (smps) {
 310         case IEEE80211_SMPS_AUTOMATIC:
 311         case IEEE80211_SMPS_NUM_MODES:
 312                 WARN_ON(1);
 313         case IEEE80211_SMPS_OFF:
 314                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 315                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 316                 break;
 317         case IEEE80211_SMPS_STATIC:
 318                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 319                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 320                 break;
 321         case IEEE80211_SMPS_DYNAMIC:
 322                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 323                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 324                 break;
 325         }
 326
 327         /* reserve and fill IE */
 328         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 329         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 330 }
 331
 332 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 333                                  struct sk_buff *skb,
 334                                  struct ieee80211_supported_band *sband)
 335 {
 336         u8 *pos;
 337         u32 cap;
 338         struct ieee80211_sta_vht_cap vht_cap;
 339
 340         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 341
 342         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 343
 344         /* determine capability flags */
 345         cap = vht_cap.cap;
 346
 347         /* reserve and fill IE */
 348         pos = skb_put(skb, sizeof(struct ieee80211_vht_capabilities) + 2);
 349         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 350 }
 351
 352 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 353 {
 354         struct ieee80211_local *local = sdata->local;
 355         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 356         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 357         struct sk_buff *skb;
 358         struct ieee80211_mgmt *mgmt;
 359         u8 *pos, qos_info;
 360         size_t offset = 0, noffset;
 361         int i, count, rates_len, supp_rates_len;
 362         u16 capab;
 363         struct ieee80211_supported_band *sband;
 364         u32 rates = 0;
 365
 366         lockdep_assert_held(&ifmgd->mtx);
 367
 368         sband = local->hw.wiphy->bands[local->oper_channel->band];
 369
 370         if (assoc_data->supp_rates_len) {
 371                 /*
 372                  * Get all rates supported by the device and the AP as
 373                  * some APs don't like getting a superset of their rates
 374                  * in the association request (e.g. D-Link DAP 1353 in
 375                  * b-only mode)...
 376                  */
 377                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 378                                                        assoc_data->supp_rates_len,
 379                                                        sband, &rates);
 380         } else {
 381                 /*
 382                  * In case AP not provide any supported rates information
 383                  * before association, we send information element(s) with
 384                  * all rates that we support.
 385                  */
 386                 rates = ~0;
 387                 rates_len = sband->n_bitrates;
 388         }
 389
 390         skb = alloc_skb(local->hw.extra_tx_headroom +
 391                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 392                         2 + assoc_data->ssid_len + /* SSID */
 393                         4 + rates_len + /* (extended) rates */
 394                         4 + /* power capability */
 395                         2 + 2 * sband->n_channels + /* supported channels */
 396                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 397                         2 + sizeof(struct ieee80211_vht_capabilities) + /* VHT */
 398                         assoc_data->ie_len + /* extra IEs */
 399                         9, /* WMM */
 400                         GFP_KERNEL);
 401         if (!skb)
 402                 return;
 403
 404         skb_reserve(skb, local->hw.extra_tx_headroom);
 405
 406         capab = WLAN_CAPABILITY_ESS;
 407
 408         if (sband->band == IEEE80211_BAND_2GHZ) {
 409                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 410                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 411                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 412                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 413         }
 414
 415         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 416                 capab |= WLAN_CAPABILITY_PRIVACY;
 417
 418         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 419             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 420                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 421
 422         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 423         memset(mgmt, 0, 24);
 424         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 425         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 426         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 427
 428         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 429                 skb_put(skb, 10);
 430                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 431                                                   IEEE80211_STYPE_REASSOC_REQ);
 432                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 433                 mgmt->u.reassoc_req.listen_interval =
 434                                 cpu_to_le16(local->hw.conf.listen_interval);
 435                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 436                        ETH_ALEN);
 437         } else {
 438                 skb_put(skb, 4);
 439                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 440                                                   IEEE80211_STYPE_ASSOC_REQ);
 441                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 442                 mgmt->u.assoc_req.listen_interval =
 443                                 cpu_to_le16(local->hw.conf.listen_interval);
 444         }
 445
 446         /* SSID */
 447         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 448         *pos++ = WLAN_EID_SSID;
 449         *pos++ = assoc_data->ssid_len;
 450         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 451
 452         /* add all rates which were marked to be used above */
 453         supp_rates_len = rates_len;
 454         if (supp_rates_len > 8)
 455                 supp_rates_len = 8;
 456
 457         pos = skb_put(skb, supp_rates_len + 2);
 458         *pos++ = WLAN_EID_SUPP_RATES;
 459         *pos++ = supp_rates_len;
 460
 461         count = 0;
 462         for (i = 0; i < sband->n_bitrates; i++) {
 463                 if (BIT(i) & rates) {
 464                         int rate = sband->bitrates[i].bitrate;
 465                         *pos++ = (u8) (rate / 5);
 466                         if (++count == 8)
 467                                 break;
 468                 }
 469         }
 470
 471         if (rates_len > count) {
 472                 pos = skb_put(skb, rates_len - count + 2);
 473                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 474                 *pos++ = rates_len - count;
 475
 476                 for (i++; i < sband->n_bitrates; i++) {
 477                         if (BIT(i) & rates) {
 478                                 int rate = sband->bitrates[i].bitrate;
 479                                 *pos++ = (u8) (rate / 5);
 480                         }
 481                 }
 482         }
 483
 484         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 485                 /* 1. power capabilities */
 486                 pos = skb_put(skb, 4);
 487                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 488                 *pos++ = 2;
 489                 *pos++ = 0; /* min tx power */
 490                 *pos++ = local->oper_channel->max_power; /* max tx power */
 491
 492                 /* 2. supported channels */
 493                 /* TODO: get this in reg domain format */
 494                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 495                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 496                 *pos++ = 2 * sband->n_channels;
 497                 for (i = 0; i < sband->n_channels; i++) {
 498                         *pos++ = ieee80211_frequency_to_channel(
 499                                         sband->channels[i].center_freq);
 500                         *pos++ = 1; /* one channel in the subband*/
 501                 }
 502         }
 503
 504         /* if present, add any custom IEs that go before HT */
 505         if (assoc_data->ie_len && assoc_data->ie) {
 506                 static const u8 before_ht[] = {
 507                         WLAN_EID_SSID,
 508                         WLAN_EID_SUPP_RATES,
 509                         WLAN_EID_EXT_SUPP_RATES,
 510                         WLAN_EID_PWR_CAPABILITY,
 511                         WLAN_EID_SUPPORTED_CHANNELS,
 512                         WLAN_EID_RSN,
 513                         WLAN_EID_QOS_CAPA,
 514                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 515                         WLAN_EID_MOBILITY_DOMAIN,
 516                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 517                 };
 518                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 519                                              before_ht, ARRAY_SIZE(before_ht),
 520                                              offset);
 521                 pos = skb_put(skb, noffset - offset);
 522                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 523                 offset = noffset;
 524         }
 525
 526         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 527                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 528                                     sband, local->oper_channel, ifmgd->ap_smps);
 529
 530         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 531                 ieee80211_add_vht_ie(sdata, skb, sband);
 532
 533         /* if present, add any custom non-vendor IEs that go after HT */
 534         if (assoc_data->ie_len && assoc_data->ie) {
 535                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 536                                                     assoc_data->ie_len,
 537                                                     offset);
 538                 pos = skb_put(skb, noffset - offset);
 539                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 540                 offset = noffset;
 541         }
 542
 543         if (assoc_data->wmm) {
 544                 if (assoc_data->uapsd) {
 545                         qos_info = ifmgd->uapsd_queues;
 546                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 547                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 548                 } else {
 549                         qos_info = 0;
 550                 }
 551
 552                 pos = skb_put(skb, 9);
 553                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 554                 *pos++ = 7; /* len */
 555                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 556                 *pos++ = 0x50;
 557                 *pos++ = 0xf2;
 558                 *pos++ = 2; /* WME */
 559                 *pos++ = 0; /* WME info */
 560                 *pos++ = 1; /* WME ver */
 561                 *pos++ = qos_info;
 562         }
 563
 564         /* add any remaining custom (i.e. vendor specific here) IEs */
 565         if (assoc_data->ie_len && assoc_data->ie) {
 566                 noffset = assoc_data->ie_len;
 567                 pos = skb_put(skb, noffset - offset);
 568                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 569         }
 570
 571         drv_mgd_prepare_tx(local, sdata);
 572
 573         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 574         ieee80211_tx_skb(sdata, skb);
 575 }
 576
 577 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 578                                            const u8 *bssid, u16 stype,
 579                                            u16 reason, bool send_frame,
 580                                            u8 *frame_buf)
 581 {
 582         struct ieee80211_local *local = sdata->local;
 583         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 584         struct sk_buff *skb;
 585         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 586
 587         /* build frame */
 588         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 589         mgmt->duration = 0; /* initialize only */
 590         mgmt->seq_ctrl = 0; /* initialize only */
 591         memcpy(mgmt->da, bssid, ETH_ALEN);
 592         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 593         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 594         /* u.deauth.reason_code == u.disassoc.reason_code */
 595         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 596
 597         if (send_frame) {
 598                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 599                                     DEAUTH_DISASSOC_LEN);
 600                 if (!skb)
 601                         return;
 602
 603                 skb_reserve(skb, local->hw.extra_tx_headroom);
 604
 605                 /* copy in frame */
 606                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 607                        mgmt, DEAUTH_DISASSOC_LEN);
 608
 609                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 610                         IEEE80211_SKB_CB(skb)->flags |=
 611                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 612
 613                 ieee80211_tx_skb(sdata, skb);
 614         }
 615 }
 616
 617 void ieee80211_send_pspoll(struct ieee80211_local *local,
 618                            struct ieee80211_sub_if_data *sdata)
 619 {
 620         struct ieee80211_pspoll *pspoll;
 621         struct sk_buff *skb;
 622
 623         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 624         if (!skb)
 625                 return;
 626
 627         pspoll = (struct ieee80211_pspoll *) skb->data;
 628         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 629
 630         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 631         ieee80211_tx_skb(sdata, skb);
 632 }
 633
 634 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 635                              struct ieee80211_sub_if_data *sdata,
 636                              int powersave)
 637 {
 638         struct sk_buff *skb;
 639         struct ieee80211_hdr_3addr *nullfunc;
 640         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 641
 642         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 643         if (!skb)
 644                 return;
 645
 646         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 647         if (powersave)
 648                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 649
 650         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 651         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 652                             IEEE80211_STA_CONNECTION_POLL))
 653                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 654
 655         ieee80211_tx_skb(sdata, skb);
 656 }
 657
 658 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 659                                           struct ieee80211_sub_if_data *sdata)
 660 {
 661         struct sk_buff *skb;
 662         struct ieee80211_hdr *nullfunc;
 663         __le16 fc;
 664
 665         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 666                 return;
 667
 668         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 669         if (!skb)
 670                 return;
 671
 672         skb_reserve(skb, local->hw.extra_tx_headroom);
 673
 674         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 675         memset(nullfunc, 0, 30);
 676         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 677                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 678         nullfunc->frame_control = fc;
 679         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 680         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 681         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 682         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 683
 684         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 685         ieee80211_tx_skb(sdata, skb);
 686 }
 687
 688 /* spectrum management related things */
 689 static void ieee80211_chswitch_work(struct work_struct *work)
 690 {
 691         struct ieee80211_sub_if_data *sdata =
 692                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 693         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 694
 695         if (!ieee80211_sdata_running(sdata))
 696                 return;
 697
 698         mutex_lock(&ifmgd->mtx);
 699         if (!ifmgd->associated)
 700                 goto out;
 701
 702         sdata->local->oper_channel = sdata->local->csa_channel;
 703         if (!sdata->local->ops->channel_switch) {
 704                 /* call "hw_config" only if doing sw channel switch */
 705                 ieee80211_hw_config(sdata->local,
 706                         IEEE80211_CONF_CHANGE_CHANNEL);
 707         } else {
 708                 /* update the device channel directly */
 709                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 710         }
 711
 712         /* XXX: shouldn't really modify cfg80211-owned data! */
 713         ifmgd->associated->channel = sdata->local->oper_channel;
 714
 715         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 716                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 717  out:
 718         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 719         mutex_unlock(&ifmgd->mtx);
 720 }
 721
 722 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 723 {
 724         struct ieee80211_sub_if_data *sdata;
 725         struct ieee80211_if_managed *ifmgd;
 726
 727         sdata = vif_to_sdata(vif);
 728         ifmgd = &sdata->u.mgd;
 729
 730         trace_api_chswitch_done(sdata, success);
 731         if (!success) {
 732                 /*
 733                  * If the channel switch was not successful, stay
 734                  * around on the old channel. We currently lack
 735                  * good handling of this situation, possibly we
 736                  * should just drop the association.
 737                  */
 738                 sdata->local->csa_channel = sdata->local->oper_channel;
 739         }
 740
 741         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 742 }
 743 EXPORT_SYMBOL(ieee80211_chswitch_done);
 744
 745 static void ieee80211_chswitch_timer(unsigned long data)
 746 {
 747         struct ieee80211_sub_if_data *sdata =
 748                 (struct ieee80211_sub_if_data *) data;
 749         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 750
 751         if (sdata->local->quiescing) {
 752                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 753                 return;
 754         }
 755
 756         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 757 }
 758
 759 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 760                                       struct ieee80211_channel_sw_ie *sw_elem,
 761                                       struct ieee80211_bss *bss,
 762                                       u64 timestamp)
 763 {
 764         struct cfg80211_bss *cbss =
 765                 container_of((void *)bss, struct cfg80211_bss, priv);
 766         struct ieee80211_channel *new_ch;
 767         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 768         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 769                                                       cbss->channel->band);
 770
 771         ASSERT_MGD_MTX(ifmgd);
 772
 773         if (!ifmgd->associated)
 774                 return;
 775
 776         if (sdata->local->scanning)
 777                 return;
 778
 779         /* Disregard subsequent beacons if we are already running a timer
 780            processing a CSA */
 781
 782         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 783                 return;
 784
 785         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 786         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 787                 return;
 788
 789         sdata->local->csa_channel = new_ch;
 790
 791         if (sdata->local->ops->channel_switch) {
 792                 /* use driver's channel switch callback */
 793                 struct ieee80211_channel_switch ch_switch;
 794                 memset(&ch_switch, 0, sizeof(ch_switch));
 795                 ch_switch.timestamp = timestamp;
 796                 if (sw_elem->mode) {
 797                         ch_switch.block_tx = true;
 798                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 799                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 800                 }
 801                 ch_switch.channel = new_ch;
 802                 ch_switch.count = sw_elem->count;
 803                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 804                 drv_channel_switch(sdata->local, &ch_switch);
 805                 return;
 806         }
 807
 808         /* channel switch handled in software */
 809         if (sw_elem->count <= 1) {
 810                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 811         } else {
 812                 if (sw_elem->mode)
 813                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 814                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 815                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 816                 mod_timer(&ifmgd->chswitch_timer,
 817                           jiffies +
 818                           msecs_to_jiffies(sw_elem->count *
 819                                            cbss->beacon_interval));
 820         }
 821 }
 822
 823 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 824                                         u16 capab_info, u8 *pwr_constr_elem,
 825                                         u8 pwr_constr_elem_len)
 826 {
 827         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 828
 829         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 830                 return;
 831
 832         /* Power constraint IE length should be 1 octet */
 833         if (pwr_constr_elem_len != 1)
 834                 return;
 835
 836         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 837             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 838                 sdata->local->power_constr_level = *pwr_constr_elem;
 839                 ieee80211_hw_config(sdata->local, 0);
 840         }
 841 }
 842
 843 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 844 {
 845         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 846         struct ieee80211_local *local = sdata->local;
 847         struct ieee80211_conf *conf = &local->hw.conf;
 848
 849         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 850                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 851                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 852
 853         local->disable_dynamic_ps = false;
 854         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 855 }
 856 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 857
 858 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 859 {
 860         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 861         struct ieee80211_local *local = sdata->local;
 862         struct ieee80211_conf *conf = &local->hw.conf;
 863
 864         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 865                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 866                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 867
 868         local->disable_dynamic_ps = true;
 869         conf->dynamic_ps_timeout = 0;
 870         del_timer_sync(&local->dynamic_ps_timer);
 871         ieee80211_queue_work(&local->hw,
 872                              &local->dynamic_ps_enable_work);
 873 }
 874 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 875
 876 /* powersave */
 877 static void ieee80211_enable_ps(struct ieee80211_local *local,
 878                                 struct ieee80211_sub_if_data *sdata)
 879 {
 880         struct ieee80211_conf *conf = &local->hw.conf;
 881
 882         /*
 883          * If we are scanning right now then the parameters will
 884          * take effect when scan finishes.
 885          */
 886         if (local->scanning)
 887                 return;
 888
 889         if (conf->dynamic_ps_timeout > 0 &&
 890             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 891                 mod_timer(&local->dynamic_ps_timer, jiffies +
 892                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 893         } else {
 894                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 895                         ieee80211_send_nullfunc(local, sdata, 1);
 896
 897                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 898                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 899                         return;
 900
 901                 conf->flags |= IEEE80211_CONF_PS;
 902                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 903         }
 904 }
 905
 906 static void ieee80211_change_ps(struct ieee80211_local *local)
 907 {
 908         struct ieee80211_conf *conf = &local->hw.conf;
 909
 910         if (local->ps_sdata) {
 911                 ieee80211_enable_ps(local, local->ps_sdata);
 912         } else if (conf->flags & IEEE80211_CONF_PS) {
 913                 conf->flags &= ~IEEE80211_CONF_PS;
 914                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 915                 del_timer_sync(&local->dynamic_ps_timer);
 916                 cancel_work_sync(&local->dynamic_ps_enable_work);
 917         }
 918 }
 919
 920 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 921 {
 922         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 923         struct sta_info *sta = NULL;
 924         bool authorized = false;
 925
 926         if (!mgd->powersave)
 927                 return false;
 928
 929         if (mgd->broken_ap)
 930                 return false;
 931
 932         if (!mgd->associated)
 933                 return false;
 934
 935         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 936                           IEEE80211_STA_CONNECTION_POLL))
 937                 return false;
 938
 939         rcu_read_lock();
 940         sta = sta_info_get(sdata, mgd->bssid);
 941         if (sta)
 942                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 943         rcu_read_unlock();
 944
 945         return authorized;
 946 }
 947
 948 /* need to hold RTNL or interface lock */
 949 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 950 {
 951         struct ieee80211_sub_if_data *sdata, *found = NULL;
 952         int count = 0;
 953         int timeout;
 954
 955         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 956                 local->ps_sdata = NULL;
 957                 return;
 958         }
 959
 960         list_for_each_entry(sdata, &local->interfaces, list) {
 961                 if (!ieee80211_sdata_running(sdata))
 962                         continue;
 963                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 964                         /* If an AP vif is found, then disable PS
 965                          * by setting the count to zero thereby setting
 966                          * ps_sdata to NULL.
 967                          */
 968                         count = 0;
 969                         break;
 970                 }
 971                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 972                         continue;
 973                 found = sdata;
 974                 count++;
 975         }
 976
 977         if (count == 1 && ieee80211_powersave_allowed(found)) {
 978                 struct ieee80211_conf *conf = &local->hw.conf;
 979                 s32 beaconint_us;
 980
 981                 if (latency < 0)
 982                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 983
 984                 beaconint_us = ieee80211_tu_to_usec(
 985                                         found->vif.bss_conf.beacon_int);
 986
 987                 timeout = local->dynamic_ps_forced_timeout;
 988                 if (timeout < 0) {
 989                         /*
 990                          * Go to full PSM if the user configures a very low
 991                          * latency requirement.
 992                          * The 2000 second value is there for compatibility
 993                          * until the PM_QOS_NETWORK_LATENCY is configured
 994                          * with real values.
 995                          */
 996                         if (latency > (1900 * USEC_PER_MSEC) &&
 997                             latency != (2000 * USEC_PER_SEC))
 998                                 timeout = 0;
 999                         else
1000                                 timeout = 100;
1001                 }
1002                 local->dynamic_ps_user_timeout = timeout;
1003                 if (!local->disable_dynamic_ps)
1004                         conf->dynamic_ps_timeout =
1005                                 local->dynamic_ps_user_timeout;
1006
1007                 if (beaconint_us > latency) {
1008                         local->ps_sdata = NULL;
1009                 } else {
1010                         struct ieee80211_bss *bss;
1011                         int maxslp = 1;
1012                         u8 dtimper;
1013
1014                         bss = (void *)found->u.mgd.associated->priv;
1015                         dtimper = bss->dtim_period;
1016
1017                         /* If the TIM IE is invalid, pretend the value is 1 */
1018                         if (!dtimper)
1019                                 dtimper = 1;
1020                         else if (dtimper > 1)
1021                                 maxslp = min_t(int, dtimper,
1022                                                     latency / beaconint_us);
1023
1024                         local->hw.conf.max_sleep_period = maxslp;
1025                         local->hw.conf.ps_dtim_period = dtimper;
1026                         local->ps_sdata = found;
1027                 }
1028         } else {
1029                 local->ps_sdata = NULL;
1030         }
1031
1032         ieee80211_change_ps(local);
1033 }
1034
1035 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1036 {
1037         struct ieee80211_local *local =
1038                 container_of(work, struct ieee80211_local,
1039                              dynamic_ps_disable_work);
1040
1041         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1042                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1043                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1044         }
1045
1046         ieee80211_wake_queues_by_reason(&local->hw,
1047                                         IEEE80211_QUEUE_STOP_REASON_PS);
1048 }
1049
1050 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1051 {
1052         struct ieee80211_local *local =
1053                 container_of(work, struct ieee80211_local,
1054                              dynamic_ps_enable_work);
1055         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1056         struct ieee80211_if_managed *ifmgd;
1057         unsigned long flags;
1058         int q;
1059
1060         /* can only happen when PS was just disabled anyway */
1061         if (!sdata)
1062                 return;
1063
1064         ifmgd = &sdata->u.mgd;
1065
1066         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1067                 return;
1068
1069         if (!local->disable_dynamic_ps &&
1070             local->hw.conf.dynamic_ps_timeout > 0) {
1071                 /* don't enter PS if TX frames are pending */
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                         return;
1077                 }
1078
1079                 /*
1080                  * transmission can be stopped by others which leads to
1081                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1082                  * is not the actual idle state.
1083                  */
1084                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1085                 for (q = 0; q < local->hw.queues; q++) {
1086                         if (local->queue_stop_reasons[q]) {
1087                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1088                                                        flags);
1089                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1090                                           msecs_to_jiffies(
1091                                           local->hw.conf.dynamic_ps_timeout));
1092                                 return;
1093                         }
1094                 }
1095                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1096         }
1097
1098         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1099             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1100                 netif_tx_stop_all_queues(sdata->dev);
1101
1102                 if (drv_tx_frames_pending(local))
1103                         mod_timer(&local->dynamic_ps_timer, jiffies +
1104                                   msecs_to_jiffies(
1105                                   local->hw.conf.dynamic_ps_timeout));
1106                 else {
1107                         ieee80211_send_nullfunc(local, sdata, 1);
1108                         /* Flush to get the tx status of nullfunc frame */
1109                         drv_flush(local, false);
1110                 }
1111         }
1112
1113         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1114               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1115             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1116                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1117                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1118                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1119         }
1120
1121         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1122                 netif_tx_wake_all_queues(sdata->dev);
1123 }
1124
1125 void ieee80211_dynamic_ps_timer(unsigned long data)
1126 {
1127         struct ieee80211_local *local = (void *) data;
1128
1129         if (local->quiescing || local->suspended)
1130                 return;
1131
1132         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1133 }
1134
1135 /* MLME */
1136 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1137                                      struct ieee80211_sub_if_data *sdata,
1138                                      u8 *wmm_param, size_t wmm_param_len)
1139 {
1140         struct ieee80211_tx_queue_params params;
1141         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1142         size_t left;
1143         int count;
1144         u8 *pos, uapsd_queues = 0;
1145
1146         if (!local->ops->conf_tx)
1147                 return false;
1148
1149         if (local->hw.queues < IEEE80211_NUM_ACS)
1150                 return false;
1151
1152         if (!wmm_param)
1153                 return false;
1154
1155         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1156                 return false;
1157
1158         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1159                 uapsd_queues = ifmgd->uapsd_queues;
1160
1161         count = wmm_param[6] & 0x0f;
1162         if (count == ifmgd->wmm_last_param_set)
1163                 return false;
1164         ifmgd->wmm_last_param_set = count;
1165
1166         pos = wmm_param + 8;
1167         left = wmm_param_len - 8;
1168
1169         memset(&params, 0, sizeof(params));
1170
1171         sdata->wmm_acm = 0;
1172         for (; left >= 4; left -= 4, pos += 4) {
1173                 int aci = (pos[0] >> 5) & 0x03;
1174                 int acm = (pos[0] >> 4) & 0x01;
1175                 bool uapsd = false;
1176                 int queue;
1177
1178                 switch (aci) {
1179                 case 1: /* AC_BK */
1180                         queue = 3;
1181                         if (acm)
1182                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1183                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1184                                 uapsd = true;
1185                         break;
1186                 case 2: /* AC_VI */
1187                         queue = 1;
1188                         if (acm)
1189                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1190                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1191                                 uapsd = true;
1192                         break;
1193                 case 3: /* AC_VO */
1194                         queue = 0;
1195                         if (acm)
1196                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1197                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1198                                 uapsd = true;
1199                         break;
1200                 case 0: /* AC_BE */
1201                 default:
1202                         queue = 2;
1203                         if (acm)
1204                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1205                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1206                                 uapsd = true;
1207                         break;
1208                 }
1209
1210                 params.aifs = pos[0] & 0x0f;
1211                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1212                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1213                 params.txop = get_unaligned_le16(pos + 2);
1214                 params.uapsd = uapsd;
1215
1216                 mlme_dbg(sdata,
1217                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1218                          queue, aci, acm,
1219                          params.aifs, params.cw_min, params.cw_max,
1220                          params.txop, params.uapsd);
1221                 sdata->tx_conf[queue] = params;
1222                 if (drv_conf_tx(local, sdata, queue, &params))
1223                         sdata_err(sdata,
1224                                   "failed to set TX queue parameters for queue %d\n",
1225                                   queue);
1226         }
1227
1228         /* enable WMM or activate new settings */
1229         sdata->vif.bss_conf.qos = true;
1230         return true;
1231 }
1232
1233 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1234 {
1235         lockdep_assert_held(&sdata->local->mtx);
1236
1237         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1238                                 IEEE80211_STA_BEACON_POLL);
1239         ieee80211_run_deferred_scan(sdata->local);
1240 }
1241
1242 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1243 {
1244         mutex_lock(&sdata->local->mtx);
1245         __ieee80211_stop_poll(sdata);
1246         mutex_unlock(&sdata->local->mtx);
1247 }
1248
1249 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1250                                            u16 capab, bool erp_valid, u8 erp)
1251 {
1252         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1253         u32 changed = 0;
1254         bool use_protection;
1255         bool use_short_preamble;
1256         bool use_short_slot;
1257
1258         if (erp_valid) {
1259                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1260                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1261         } else {
1262                 use_protection = false;
1263                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1264         }
1265
1266         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1267         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1268                 use_short_slot = true;
1269
1270         if (use_protection != bss_conf->use_cts_prot) {
1271                 bss_conf->use_cts_prot = use_protection;
1272                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1273         }
1274
1275         if (use_short_preamble != bss_conf->use_short_preamble) {
1276                 bss_conf->use_short_preamble = use_short_preamble;
1277                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1278         }
1279
1280         if (use_short_slot != bss_conf->use_short_slot) {
1281                 bss_conf->use_short_slot = use_short_slot;
1282                 changed |= BSS_CHANGED_ERP_SLOT;
1283         }
1284
1285         return changed;
1286 }
1287
1288 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1289                                      struct cfg80211_bss *cbss,
1290                                      u32 bss_info_changed)
1291 {
1292         struct ieee80211_bss *bss = (void *)cbss->priv;
1293         struct ieee80211_local *local = sdata->local;
1294         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1295
1296         bss_info_changed |= BSS_CHANGED_ASSOC;
1297         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1298                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1299
1300         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1301                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1302
1303         sdata->u.mgd.associated = cbss;
1304         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1305
1306         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1307
1308         /* just to be sure */
1309         ieee80211_stop_poll(sdata);
1310
1311         ieee80211_led_assoc(local, 1);
1312
1313         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1314                 bss_conf->dtim_period = bss->dtim_period;
1315         else
1316                 bss_conf->dtim_period = 0;
1317
1318         bss_conf->assoc = 1;
1319
1320         /* Tell the driver to monitor connection quality (if supported) */
1321         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1322             bss_conf->cqm_rssi_thold)
1323                 bss_info_changed |= BSS_CHANGED_CQM;
1324
1325         /* Enable ARP filtering */
1326         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1327                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1328                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1329         }
1330
1331         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1332
1333         mutex_lock(&local->iflist_mtx);
1334         ieee80211_recalc_ps(local, -1);
1335         ieee80211_recalc_smps(local);
1336         mutex_unlock(&local->iflist_mtx);
1337
1338         netif_tx_start_all_queues(sdata->dev);
1339         netif_carrier_on(sdata->dev);
1340 }
1341
1342 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1343                                    u16 stype, u16 reason, bool tx,
1344                                    u8 *frame_buf)
1345 {
1346         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1347         struct ieee80211_local *local = sdata->local;
1348         struct sta_info *sta;
1349         u32 changed = 0;
1350
1351         ASSERT_MGD_MTX(ifmgd);
1352
1353         if (WARN_ON_ONCE(tx && !frame_buf))
1354                 return;
1355
1356         if (WARN_ON(!ifmgd->associated))
1357                 return;
1358
1359         ieee80211_stop_poll(sdata);
1360
1361         ifmgd->associated = NULL;
1362
1363         /*
1364          * we need to commit the associated = NULL change because the
1365          * scan code uses that to determine whether this iface should
1366          * go to/wake up from powersave or not -- and could otherwise
1367          * wake the queues erroneously.
1368          */
1369         smp_mb();
1370
1371         /*
1372          * Thus, we can only afterwards stop the queues -- to account
1373          * for the case where another CPU is finishing a scan at this
1374          * time -- we don't want the scan code to enable queues.
1375          */
1376
1377         netif_tx_stop_all_queues(sdata->dev);
1378         netif_carrier_off(sdata->dev);
1379
1380         mutex_lock(&local->sta_mtx);
1381         sta = sta_info_get(sdata, ifmgd->bssid);
1382         if (sta) {
1383                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1384                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1385         }
1386         mutex_unlock(&local->sta_mtx);
1387
1388         /*
1389          * if we want to get out of ps before disassoc (why?) we have
1390          * to do it before sending disassoc, as otherwise the null-packet
1391          * won't be valid.
1392          */
1393         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1394                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1395                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1396         }
1397         local->ps_sdata = NULL;
1398
1399         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1400         if (tx)
1401                 drv_flush(local, false);
1402
1403         /* deauthenticate/disassociate now */
1404         if (tx || frame_buf)
1405                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1406                                                reason, tx, frame_buf);
1407
1408         /* flush out frame */
1409         if (tx)
1410                 drv_flush(local, false);
1411
1412         /* clear bssid only after building the needed mgmt frames */
1413         memset(ifmgd->bssid, 0, ETH_ALEN);
1414
1415         /* remove AP and TDLS peers */
1416         sta_info_flush(local, sdata);
1417
1418         /* finally reset all BSS / config parameters */
1419         changed |= ieee80211_reset_erp_info(sdata);
1420
1421         ieee80211_led_assoc(local, 0);
1422         changed |= BSS_CHANGED_ASSOC;
1423         sdata->vif.bss_conf.assoc = false;
1424
1425         /* on the next assoc, re-program HT parameters */
1426         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1427         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1428
1429         local->power_constr_level = 0;
1430
1431         del_timer_sync(&local->dynamic_ps_timer);
1432         cancel_work_sync(&local->dynamic_ps_enable_work);
1433
1434         /* Disable ARP filtering */
1435         if (sdata->vif.bss_conf.arp_filter_enabled) {
1436                 sdata->vif.bss_conf.arp_filter_enabled = false;
1437                 changed |= BSS_CHANGED_ARP_FILTER;
1438         }
1439
1440         sdata->vif.bss_conf.qos = false;
1441         changed |= BSS_CHANGED_QOS;
1442
1443         /* The BSSID (not really interesting) and HT changed */
1444         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1445         ieee80211_bss_info_change_notify(sdata, changed);
1446
1447         /* channel(_type) changes are handled by ieee80211_hw_config */
1448         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1449         ieee80211_hw_config(local, 0);
1450
1451         /* disassociated - set to defaults now */
1452         ieee80211_set_wmm_default(sdata, false);
1453
1454         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1455         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1456         del_timer_sync(&sdata->u.mgd.timer);
1457         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1458 }
1459
1460 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1461                              struct ieee80211_hdr *hdr)
1462 {
1463         /*
1464          * We can postpone the mgd.timer whenever receiving unicast frames
1465          * from AP because we know that the connection is working both ways
1466          * at that time. But multicast frames (and hence also beacons) must
1467          * be ignored here, because we need to trigger the timer during
1468          * data idle periods for sending the periodic probe request to the
1469          * AP we're connected to.
1470          */
1471         if (is_multicast_ether_addr(hdr->addr1))
1472                 return;
1473
1474         ieee80211_sta_reset_conn_monitor(sdata);
1475 }
1476
1477 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1478 {
1479         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1480         struct ieee80211_local *local = sdata->local;
1481
1482         mutex_lock(&local->mtx);
1483         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1484                               IEEE80211_STA_CONNECTION_POLL))) {
1485                 mutex_unlock(&local->mtx);
1486                 return;
1487         }
1488
1489         __ieee80211_stop_poll(sdata);
1490
1491         mutex_lock(&local->iflist_mtx);
1492         ieee80211_recalc_ps(local, -1);
1493         mutex_unlock(&local->iflist_mtx);
1494
1495         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1496                 goto out;
1497
1498         /*
1499          * We've received a probe response, but are not sure whether
1500          * we have or will be receiving any beacons or data, so let's
1501          * schedule the timers again, just in case.
1502          */
1503         ieee80211_sta_reset_beacon_monitor(sdata);
1504
1505         mod_timer(&ifmgd->conn_mon_timer,
1506                   round_jiffies_up(jiffies +
1507                                    IEEE80211_CONNECTION_IDLE_TIME));
1508 out:
1509         mutex_unlock(&local->mtx);
1510 }
1511
1512 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1513                              struct ieee80211_hdr *hdr, bool ack)
1514 {
1515         if (!ieee80211_is_data(hdr->frame_control))
1516             return;
1517
1518         if (ack)
1519                 ieee80211_sta_reset_conn_monitor(sdata);
1520
1521         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1522             sdata->u.mgd.probe_send_count > 0) {
1523                 if (ack)
1524                         sdata->u.mgd.probe_send_count = 0;
1525                 else
1526                         sdata->u.mgd.nullfunc_failed = true;
1527                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1528         }
1529 }
1530
1531 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1532 {
1533         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1534         const u8 *ssid;
1535         u8 *dst = ifmgd->associated->bssid;
1536         u8 unicast_limit = max(1, max_probe_tries - 3);
1537
1538         /*
1539          * Try sending broadcast probe requests for the last three
1540          * probe requests after the first ones failed since some
1541          * buggy APs only support broadcast probe requests.
1542          */
1543         if (ifmgd->probe_send_count >= unicast_limit)
1544                 dst = NULL;
1545
1546         /*
1547          * When the hardware reports an accurate Tx ACK status, it's
1548          * better to send a nullfunc frame instead of a probe request,
1549          * as it will kick us off the AP quickly if we aren't associated
1550          * anymore. The timeout will be reset if the frame is ACKed by
1551          * the AP.
1552          */
1553         ifmgd->probe_send_count++;
1554
1555         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1556                 ifmgd->nullfunc_failed = false;
1557                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1558         } else {
1559                 int ssid_len;
1560
1561                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1562                 if (WARN_ON_ONCE(ssid == NULL))
1563                         ssid_len = 0;
1564                 else
1565                         ssid_len = ssid[1];
1566
1567                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1568                                          0, (u32) -1, true, false);
1569         }
1570
1571         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1572         run_again(ifmgd, ifmgd->probe_timeout);
1573         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1574                 drv_flush(sdata->local, false);
1575 }
1576
1577 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1578                                    bool beacon)
1579 {
1580         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1581         bool already = false;
1582
1583         if (!ieee80211_sdata_running(sdata))
1584                 return;
1585
1586         mutex_lock(&ifmgd->mtx);
1587
1588         if (!ifmgd->associated)
1589                 goto out;
1590
1591         mutex_lock(&sdata->local->mtx);
1592
1593         if (sdata->local->tmp_channel || sdata->local->scanning) {
1594                 mutex_unlock(&sdata->local->mtx);
1595                 goto out;
1596         }
1597
1598         if (beacon)
1599                 mlme_dbg_ratelimited(sdata,
1600                                      "detected beacon loss from AP - sending probe request\n");
1601
1602         ieee80211_cqm_rssi_notify(&sdata->vif,
1603                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1604
1605         /*
1606          * The driver/our work has already reported this event or the
1607          * connection monitoring has kicked in and we have already sent
1608          * a probe request. Or maybe the AP died and the driver keeps
1609          * reporting until we disassociate...
1610          *
1611          * In either case we have to ignore the current call to this
1612          * function (except for setting the correct probe reason bit)
1613          * because otherwise we would reset the timer every time and
1614          * never check whether we received a probe response!
1615          */
1616         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1617                             IEEE80211_STA_CONNECTION_POLL))
1618                 already = true;
1619
1620         if (beacon)
1621                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1622         else
1623                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1624
1625         mutex_unlock(&sdata->local->mtx);
1626
1627         if (already)
1628                 goto out;
1629
1630         mutex_lock(&sdata->local->iflist_mtx);
1631         ieee80211_recalc_ps(sdata->local, -1);
1632         mutex_unlock(&sdata->local->iflist_mtx);
1633
1634         ifmgd->probe_send_count = 0;
1635         ieee80211_mgd_probe_ap_send(sdata);
1636  out:
1637         mutex_unlock(&ifmgd->mtx);
1638 }
1639
1640 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1641                                           struct ieee80211_vif *vif)
1642 {
1643         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1644         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1645         struct cfg80211_bss *cbss;
1646         struct sk_buff *skb;
1647         const u8 *ssid;
1648         int ssid_len;
1649
1650         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1651                 return NULL;
1652
1653         ASSERT_MGD_MTX(ifmgd);
1654
1655         if (ifmgd->associated)
1656                 cbss = ifmgd->associated;
1657         else if (ifmgd->auth_data)
1658                 cbss = ifmgd->auth_data->bss;
1659         else if (ifmgd->assoc_data)
1660                 cbss = ifmgd->assoc_data->bss;
1661         else
1662                 return NULL;
1663
1664         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1665         if (WARN_ON_ONCE(ssid == NULL))
1666                 ssid_len = 0;
1667         else
1668                 ssid_len = ssid[1];
1669
1670         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1671                                         (u32) -1, ssid + 2, ssid_len,
1672                                         NULL, 0, true);
1673
1674         return skb;
1675 }
1676 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1677
1678 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1679 {
1680         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1681         struct ieee80211_local *local = sdata->local;
1682         u8 bssid[ETH_ALEN];
1683         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1684
1685         mutex_lock(&ifmgd->mtx);
1686         if (!ifmgd->associated) {
1687                 mutex_unlock(&ifmgd->mtx);
1688                 return;
1689         }
1690
1691         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1692
1693         sdata_info(sdata, "Connection to AP %pM lost\n", bssid);
1694
1695         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1696                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1697                                false, frame_buf);
1698         mutex_unlock(&ifmgd->mtx);
1699
1700         /*
1701          * must be outside lock due to cfg80211,
1702          * but that's not a problem.
1703          */
1704         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1705
1706         mutex_lock(&local->mtx);
1707         ieee80211_recalc_idle(local);
1708         mutex_unlock(&local->mtx);
1709 }
1710
1711 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1712 {
1713         struct ieee80211_sub_if_data *sdata =
1714                 container_of(work, struct ieee80211_sub_if_data,
1715                              u.mgd.beacon_connection_loss_work);
1716         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1717         struct sta_info *sta;
1718
1719         if (ifmgd->associated) {
1720                 rcu_read_lock();
1721                 sta = sta_info_get(sdata, ifmgd->bssid);
1722                 if (sta)
1723                         sta->beacon_loss_count++;
1724                 rcu_read_unlock();
1725         }
1726
1727         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1728                 __ieee80211_connection_loss(sdata);
1729         else
1730                 ieee80211_mgd_probe_ap(sdata, true);
1731 }
1732
1733 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1734 {
1735         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1736         struct ieee80211_hw *hw = &sdata->local->hw;
1737
1738         trace_api_beacon_loss(sdata);
1739
1740         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1741         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1742 }
1743 EXPORT_SYMBOL(ieee80211_beacon_loss);
1744
1745 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1746 {
1747         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1748         struct ieee80211_hw *hw = &sdata->local->hw;
1749
1750         trace_api_connection_loss(sdata);
1751
1752         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1753         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1754 }
1755 EXPORT_SYMBOL(ieee80211_connection_loss);
1756
1757
1758 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1759                                         bool assoc)
1760 {
1761         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1762
1763         lockdep_assert_held(&sdata->u.mgd.mtx);
1764
1765         if (!assoc) {
1766                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1767
1768                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1769                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1770         }
1771
1772         cfg80211_put_bss(auth_data->bss);
1773         kfree(auth_data);
1774         sdata->u.mgd.auth_data = NULL;
1775 }
1776
1777 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1778                                      struct ieee80211_mgmt *mgmt, size_t len)
1779 {
1780         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1781         u8 *pos;
1782         struct ieee802_11_elems elems;
1783
1784         pos = mgmt->u.auth.variable;
1785         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1786         if (!elems.challenge)
1787                 return;
1788         auth_data->expected_transaction = 4;
1789         drv_mgd_prepare_tx(sdata->local, sdata);
1790         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1791                             elems.challenge - 2, elems.challenge_len + 2,
1792                             auth_data->bss->bssid, auth_data->bss->bssid,
1793                             auth_data->key, auth_data->key_len,
1794                             auth_data->key_idx);
1795 }
1796
1797 static enum rx_mgmt_action __must_check
1798 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1799                        struct ieee80211_mgmt *mgmt, size_t len)
1800 {
1801         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1802         u8 bssid[ETH_ALEN];
1803         u16 auth_alg, auth_transaction, status_code;
1804         struct sta_info *sta;
1805
1806         lockdep_assert_held(&ifmgd->mtx);
1807
1808         if (len < 24 + 6)
1809                 return RX_MGMT_NONE;
1810
1811         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1812                 return RX_MGMT_NONE;
1813
1814         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1815
1816         if (!ether_addr_equal(bssid, mgmt->bssid))
1817                 return RX_MGMT_NONE;
1818
1819         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1820         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1821         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1822
1823         if (auth_alg != ifmgd->auth_data->algorithm ||
1824             auth_transaction != ifmgd->auth_data->expected_transaction)
1825                 return RX_MGMT_NONE;
1826
1827         if (status_code != WLAN_STATUS_SUCCESS) {
1828                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1829                            mgmt->sa, status_code);
1830                 ieee80211_destroy_auth_data(sdata, false);
1831                 return RX_MGMT_CFG80211_RX_AUTH;
1832         }
1833
1834         switch (ifmgd->auth_data->algorithm) {
1835         case WLAN_AUTH_OPEN:
1836         case WLAN_AUTH_LEAP:
1837         case WLAN_AUTH_FT:
1838                 break;
1839         case WLAN_AUTH_SHARED_KEY:
1840                 if (ifmgd->auth_data->expected_transaction != 4) {
1841                         ieee80211_auth_challenge(sdata, mgmt, len);
1842                         /* need another frame */
1843                         return RX_MGMT_NONE;
1844                 }
1845                 break;
1846         default:
1847                 WARN_ONCE(1, "invalid auth alg %d",
1848                           ifmgd->auth_data->algorithm);
1849                 return RX_MGMT_NONE;
1850         }
1851
1852         sdata_info(sdata, "authenticated\n");
1853         ifmgd->auth_data->done = true;
1854         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1855         run_again(ifmgd, ifmgd->auth_data->timeout);
1856
1857         /* move station state to auth */
1858         mutex_lock(&sdata->local->sta_mtx);
1859         sta = sta_info_get(sdata, bssid);
1860         if (!sta) {
1861                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1862                 goto out_err;
1863         }
1864         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1865                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1866                 goto out_err;
1867         }
1868         mutex_unlock(&sdata->local->sta_mtx);
1869
1870         return RX_MGMT_CFG80211_RX_AUTH;
1871  out_err:
1872         mutex_unlock(&sdata->local->sta_mtx);
1873         /* ignore frame -- wait for timeout */
1874         return RX_MGMT_NONE;
1875 }
1876
1877
1878 static enum rx_mgmt_action __must_check
1879 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1880                          struct ieee80211_mgmt *mgmt, size_t len)
1881 {
1882         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1883         const u8 *bssid = NULL;
1884         u16 reason_code;
1885
1886         lockdep_assert_held(&ifmgd->mtx);
1887
1888         if (len < 24 + 2)
1889                 return RX_MGMT_NONE;
1890
1891         if (!ifmgd->associated ||
1892             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1893                 return RX_MGMT_NONE;
1894
1895         bssid = ifmgd->associated->bssid;
1896
1897         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1898
1899         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1900                    bssid, reason_code);
1901
1902         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1903
1904         mutex_lock(&sdata->local->mtx);
1905         ieee80211_recalc_idle(sdata->local);
1906         mutex_unlock(&sdata->local->mtx);
1907
1908         return RX_MGMT_CFG80211_DEAUTH;
1909 }
1910
1911
1912 static enum rx_mgmt_action __must_check
1913 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1914                            struct ieee80211_mgmt *mgmt, size_t len)
1915 {
1916         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1917         u16 reason_code;
1918
1919         lockdep_assert_held(&ifmgd->mtx);
1920
1921         if (len < 24 + 2)
1922                 return RX_MGMT_NONE;
1923
1924         if (!ifmgd->associated ||
1925             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1926                 return RX_MGMT_NONE;
1927
1928         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1929
1930         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1931                    mgmt->sa, reason_code);
1932
1933         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1934
1935         mutex_lock(&sdata->local->mtx);
1936         ieee80211_recalc_idle(sdata->local);
1937         mutex_unlock(&sdata->local->mtx);
1938
1939         return RX_MGMT_CFG80211_DISASSOC;
1940 }
1941
1942 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1943                                 u8 *supp_rates, unsigned int supp_rates_len,
1944                                 u32 *rates, u32 *basic_rates,
1945                                 bool *have_higher_than_11mbit,
1946                                 int *min_rate, int *min_rate_index)
1947 {
1948         int i, j;
1949
1950         for (i = 0; i < supp_rates_len; i++) {
1951                 int rate = (supp_rates[i] & 0x7f) * 5;
1952                 bool is_basic = !!(supp_rates[i] & 0x80);
1953
1954                 if (rate > 110)
1955                         *have_higher_than_11mbit = true;
1956
1957                 /*
1958                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1959                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1960                  *
1961                  * Note: Even through the membership selector and the basic
1962                  *       rate flag share the same bit, they are not exactly
1963                  *       the same.
1964                  */
1965                 if (!!(supp_rates[i] & 0x80) &&
1966                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1967                         continue;
1968
1969                 for (j = 0; j < sband->n_bitrates; j++) {
1970                         if (sband->bitrates[j].bitrate == rate) {
1971                                 *rates |= BIT(j);
1972                                 if (is_basic)
1973                                         *basic_rates |= BIT(j);
1974                                 if (rate < *min_rate) {
1975                                         *min_rate = rate;
1976                                         *min_rate_index = j;
1977                                 }
1978                                 break;
1979                         }
1980                 }
1981         }
1982 }
1983
1984 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1985                                          bool assoc)
1986 {
1987         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1988
1989         lockdep_assert_held(&sdata->u.mgd.mtx);
1990
1991         if (!assoc) {
1992                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1993
1994                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1995                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1996         }
1997
1998         kfree(assoc_data);
1999         sdata->u.mgd.assoc_data = NULL;
2000 }
2001
2002 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2003                                     struct cfg80211_bss *cbss,
2004                                     struct ieee80211_mgmt *mgmt, size_t len)
2005 {
2006         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2007         struct ieee80211_local *local = sdata->local;
2008         struct ieee80211_supported_band *sband;
2009         struct sta_info *sta;
2010         u8 *pos;
2011         u16 capab_info, aid;
2012         struct ieee802_11_elems elems;
2013         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2014         u32 changed = 0;
2015         int err;
2016
2017         /* AssocResp and ReassocResp have identical structure */
2018
2019         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2020         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2021
2022         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2023                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2024                            aid);
2025         aid &= ~(BIT(15) | BIT(14));
2026
2027         ifmgd->broken_ap = false;
2028
2029         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2030                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2031                            aid);
2032                 aid = 0;
2033                 ifmgd->broken_ap = true;
2034         }
2035
2036         pos = mgmt->u.assoc_resp.variable;
2037         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2038
2039         if (!elems.supp_rates) {
2040                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2041                 return false;
2042         }
2043
2044         ifmgd->aid = aid;
2045
2046         mutex_lock(&sdata->local->sta_mtx);
2047         /*
2048          * station info was already allocated and inserted before
2049          * the association and should be available to us
2050          */
2051         sta = sta_info_get(sdata, cbss->bssid);
2052         if (WARN_ON(!sta)) {
2053                 mutex_unlock(&sdata->local->sta_mtx);
2054                 return false;
2055         }
2056
2057         sband = local->hw.wiphy->bands[local->oper_channel->band];
2058
2059         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2060                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2061                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2062
2063         sta->supports_40mhz =
2064                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2065
2066         rate_control_rate_init(sta);
2067
2068         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2069                 set_sta_flag(sta, WLAN_STA_MFP);
2070
2071         if (elems.wmm_param)
2072                 set_sta_flag(sta, WLAN_STA_WME);
2073
2074         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2075         if (!err)
2076                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2077         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2078                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2079         if (err) {
2080                 sdata_info(sdata,
2081                            "failed to move station %pM to desired state\n",
2082                            sta->sta.addr);
2083                 WARN_ON(__sta_info_destroy(sta));
2084                 mutex_unlock(&sdata->local->sta_mtx);
2085                 return false;
2086         }
2087
2088         mutex_unlock(&sdata->local->sta_mtx);
2089
2090         /*
2091          * Always handle WMM once after association regardless
2092          * of the first value the AP uses. Setting -1 here has
2093          * that effect because the AP values is an unsigned
2094          * 4-bit value.
2095          */
2096         ifmgd->wmm_last_param_set = -1;
2097
2098         if (elems.wmm_param)
2099                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2100                                          elems.wmm_param_len);
2101         else
2102                 ieee80211_set_wmm_default(sdata, false);
2103         changed |= BSS_CHANGED_QOS;
2104
2105         if (elems.ht_operation && elems.wmm_param &&
2106             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2107                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2108                                                   cbss->bssid, false);
2109
2110         /* set AID and assoc capability,
2111          * ieee80211_set_associated() will tell the driver */
2112         bss_conf->aid = aid;
2113         bss_conf->assoc_capability = capab_info;
2114         ieee80211_set_associated(sdata, cbss, changed);
2115
2116         /*
2117          * If we're using 4-addr mode, let the AP know that we're
2118          * doing so, so that it can create the STA VLAN on its side
2119          */
2120         if (ifmgd->use_4addr)
2121                 ieee80211_send_4addr_nullfunc(local, sdata);
2122
2123         /*
2124          * Start timer to probe the connection to the AP now.
2125          * Also start the timer that will detect beacon loss.
2126          */
2127         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2128         ieee80211_sta_reset_beacon_monitor(sdata);
2129
2130         return true;
2131 }
2132
2133 static enum rx_mgmt_action __must_check
2134 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2135                              struct ieee80211_mgmt *mgmt, size_t len,
2136                              struct cfg80211_bss **bss)
2137 {
2138         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2139         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2140         u16 capab_info, status_code, aid;
2141         struct ieee802_11_elems elems;
2142         u8 *pos;
2143         bool reassoc;
2144
2145         lockdep_assert_held(&ifmgd->mtx);
2146
2147         if (!assoc_data)
2148                 return RX_MGMT_NONE;
2149         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2150                 return RX_MGMT_NONE;
2151
2152         /*
2153          * AssocResp and ReassocResp have identical structure, so process both
2154          * of them in this function.
2155          */
2156
2157         if (len < 24 + 6)
2158                 return RX_MGMT_NONE;
2159
2160         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2161         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2162         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2163         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2164
2165         sdata_info(sdata,
2166                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2167                    reassoc ? "Rea" : "A", mgmt->sa,
2168                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2169
2170         pos = mgmt->u.assoc_resp.variable;
2171         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2172
2173         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2174             elems.timeout_int && elems.timeout_int_len == 5 &&
2175             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2176                 u32 tu, ms;
2177                 tu = get_unaligned_le32(elems.timeout_int + 1);
2178                 ms = tu * 1024 / 1000;
2179                 sdata_info(sdata,
2180                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2181                            mgmt->sa, tu, ms);
2182                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2183                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2184                         run_again(ifmgd, assoc_data->timeout);
2185                 return RX_MGMT_NONE;
2186         }
2187
2188         *bss = assoc_data->bss;
2189
2190         if (status_code != WLAN_STATUS_SUCCESS) {
2191                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2192                            mgmt->sa, status_code);
2193                 ieee80211_destroy_assoc_data(sdata, false);
2194         } else {
2195                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2196                         /* oops -- internal error -- send timeout for now */
2197                         ieee80211_destroy_assoc_data(sdata, false);
2198                         cfg80211_put_bss(*bss);
2199                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2200                 }
2201                 sdata_info(sdata, "associated\n");
2202
2203                 /*
2204                  * destroy assoc_data afterwards, as otherwise an idle
2205                  * recalc after assoc_data is NULL but before associated
2206                  * is set can cause the interface to go idle
2207                  */
2208                 ieee80211_destroy_assoc_data(sdata, true);
2209         }
2210
2211         return RX_MGMT_CFG80211_RX_ASSOC;
2212 }
2213 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2214                                   struct ieee80211_mgmt *mgmt,
2215                                   size_t len,
2216                                   struct ieee80211_rx_status *rx_status,
2217                                   struct ieee802_11_elems *elems,
2218                                   bool beacon)
2219 {
2220         struct ieee80211_local *local = sdata->local;
2221         int freq;
2222         struct ieee80211_bss *bss;
2223         struct ieee80211_channel *channel;
2224         bool need_ps = false;
2225
2226         if (sdata->u.mgd.associated &&
2227             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2228                 bss = (void *)sdata->u.mgd.associated->priv;
2229                 /* not previously set so we may need to recalc */
2230                 need_ps = !bss->dtim_period;
2231         }
2232
2233         if (elems->ds_params && elems->ds_params_len == 1)
2234                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2235                                                       rx_status->band);
2236         else
2237                 freq = rx_status->freq;
2238
2239         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2240
2241         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2242                 return;
2243
2244         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2245                                         channel, beacon);
2246         if (bss)
2247                 ieee80211_rx_bss_put(local, bss);
2248
2249         if (!sdata->u.mgd.associated)
2250                 return;
2251
2252         if (need_ps) {
2253                 mutex_lock(&local->iflist_mtx);
2254                 ieee80211_recalc_ps(local, -1);
2255                 mutex_unlock(&local->iflist_mtx);
2256         }
2257
2258         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2259             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2260                                                         ETH_ALEN) == 0)) {
2261                 struct ieee80211_channel_sw_ie *sw_elem =
2262                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2263                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2264                                                  bss, rx_status->mactime);
2265         }
2266 }
2267
2268
2269 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2270                                          struct sk_buff *skb)
2271 {
2272         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2273         struct ieee80211_if_managed *ifmgd;
2274         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2275         size_t baselen, len = skb->len;
2276         struct ieee802_11_elems elems;
2277
2278         ifmgd = &sdata->u.mgd;
2279
2280         ASSERT_MGD_MTX(ifmgd);
2281
2282         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2283                 return; /* ignore ProbeResp to foreign address */
2284
2285         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2286         if (baselen > len)
2287                 return;
2288
2289         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2290                                 &elems);
2291
2292         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2293
2294         if (ifmgd->associated &&
2295             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2296                 ieee80211_reset_ap_probe(sdata);
2297
2298         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2299             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2300                 /* got probe response, continue with auth */
2301                 sdata_info(sdata, "direct probe responded\n");
2302                 ifmgd->auth_data->tries = 0;
2303                 ifmgd->auth_data->timeout = jiffies;
2304                 run_again(ifmgd, ifmgd->auth_data->timeout);
2305         }
2306 }
2307
2308 /*
2309  * This is the canonical list of information elements we care about,
2310  * the filter code also gives us all changes to the Microsoft OUI
2311  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2312  *
2313  * We implement beacon filtering in software since that means we can
2314  * avoid processing the frame here and in cfg80211, and userspace
2315  * will not be able to tell whether the hardware supports it or not.
2316  *
2317  * XXX: This list needs to be dynamic -- userspace needs to be able to
2318  *      add items it requires. It also needs to be able to tell us to
2319  *      look out for other vendor IEs.
2320  */
2321 static const u64 care_about_ies =
2322         (1ULL << WLAN_EID_COUNTRY) |
2323         (1ULL << WLAN_EID_ERP_INFO) |
2324         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2325         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2326         (1ULL << WLAN_EID_HT_CAPABILITY) |
2327         (1ULL << WLAN_EID_HT_OPERATION);
2328
2329 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2330                                      struct ieee80211_mgmt *mgmt,
2331                                      size_t len,
2332                                      struct ieee80211_rx_status *rx_status)
2333 {
2334         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2335         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2336         size_t baselen;
2337         struct ieee802_11_elems elems;
2338         struct ieee80211_local *local = sdata->local;
2339         u32 changed = 0;
2340         bool erp_valid, directed_tim = false;
2341         u8 erp_value = 0;
2342         u32 ncrc;
2343         u8 *bssid;
2344
2345         lockdep_assert_held(&ifmgd->mtx);
2346
2347         /* Process beacon from the current BSS */
2348         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2349         if (baselen > len)
2350                 return;
2351
2352         if (rx_status->freq != local->hw.conf.channel->center_freq)
2353                 return;
2354
2355         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2356             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2357                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2358                                        len - baselen, &elems);
2359
2360                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2361                                       false);
2362                 ifmgd->assoc_data->have_beacon = true;
2363                 ifmgd->assoc_data->sent_assoc = false;
2364                 /* continue assoc process */
2365                 ifmgd->assoc_data->timeout = jiffies;
2366                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2367                 return;
2368         }
2369
2370         if (!ifmgd->associated ||
2371             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2372                 return;
2373         bssid = ifmgd->associated->bssid;
2374
2375         /* Track average RSSI from the Beacon frames of the current AP */
2376         ifmgd->last_beacon_signal = rx_status->signal;
2377         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2378                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2379                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2380                 ifmgd->last_cqm_event_signal = 0;
2381                 ifmgd->count_beacon_signal = 1;
2382                 ifmgd->last_ave_beacon_signal = 0;
2383         } else {
2384                 ifmgd->ave_beacon_signal =
2385                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2386                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2387                          ifmgd->ave_beacon_signal) / 16;
2388                 ifmgd->count_beacon_signal++;
2389         }
2390
2391         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2392             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2393                 int sig = ifmgd->ave_beacon_signal;
2394                 int last_sig = ifmgd->last_ave_beacon_signal;
2395
2396                 /*
2397                  * if signal crosses either of the boundaries, invoke callback
2398                  * with appropriate parameters
2399                  */
2400                 if (sig > ifmgd->rssi_max_thold &&
2401                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2402                         ifmgd->last_ave_beacon_signal = sig;
2403                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2404                 } else if (sig < ifmgd->rssi_min_thold &&
2405                            (last_sig >= ifmgd->rssi_max_thold ||
2406                            last_sig == 0)) {
2407                         ifmgd->last_ave_beacon_signal = sig;
2408                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2409                 }
2410         }
2411
2412         if (bss_conf->cqm_rssi_thold &&
2413             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2414             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2415                 int sig = ifmgd->ave_beacon_signal / 16;
2416                 int last_event = ifmgd->last_cqm_event_signal;
2417                 int thold = bss_conf->cqm_rssi_thold;
2418                 int hyst = bss_conf->cqm_rssi_hyst;
2419                 if (sig < thold &&
2420                     (last_event == 0 || sig < last_event - hyst)) {
2421                         ifmgd->last_cqm_event_signal = sig;
2422                         ieee80211_cqm_rssi_notify(
2423                                 &sdata->vif,
2424                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2425                                 GFP_KERNEL);
2426                 } else if (sig > thold &&
2427                            (last_event == 0 || sig > last_event + hyst)) {
2428                         ifmgd->last_cqm_event_signal = sig;
2429                         ieee80211_cqm_rssi_notify(
2430                                 &sdata->vif,
2431                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2432                                 GFP_KERNEL);
2433                 }
2434         }
2435
2436         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2437                 mlme_dbg_ratelimited(sdata,
2438                                      "cancelling probereq poll due to a received beacon\n");
2439                 mutex_lock(&local->mtx);
2440                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2441                 ieee80211_run_deferred_scan(local);
2442                 mutex_unlock(&local->mtx);
2443
2444                 mutex_lock(&local->iflist_mtx);
2445                 ieee80211_recalc_ps(local, -1);
2446                 mutex_unlock(&local->iflist_mtx);
2447         }
2448
2449         /*
2450          * Push the beacon loss detection into the future since
2451          * we are processing a beacon from the AP just now.
2452          */
2453         ieee80211_sta_reset_beacon_monitor(sdata);
2454
2455         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2456         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2457                                           len - baselen, &elems,
2458                                           care_about_ies, ncrc);
2459
2460         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2461                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2462                                                    ifmgd->aid);
2463
2464         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2465                 if (directed_tim) {
2466                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2467                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2468                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2469                                         ieee80211_hw_config(local,
2470                                                             IEEE80211_CONF_CHANGE_PS);
2471                                 }
2472                                 ieee80211_send_nullfunc(local, sdata, 0);
2473                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2474                                 local->pspolling = true;
2475
2476                                 /*
2477                                  * Here is assumed that the driver will be
2478                                  * able to send ps-poll frame and receive a
2479                                  * response even though power save mode is
2480                                  * enabled, but some drivers might require
2481                                  * to disable power save here. This needs
2482                                  * to be investigated.
2483                                  */
2484                                 ieee80211_send_pspoll(local, sdata);
2485                         }
2486                 }
2487         }
2488
2489         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2490                 return;
2491         ifmgd->beacon_crc = ncrc;
2492         ifmgd->beacon_crc_valid = true;
2493
2494         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2495                               true);
2496
2497         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2498                                      elems.wmm_param_len))
2499                 changed |= BSS_CHANGED_QOS;
2500
2501         if (elems.erp_info && elems.erp_info_len >= 1) {
2502                 erp_valid = true;
2503                 erp_value = elems.erp_info[0];
2504         } else {
2505                 erp_valid = false;
2506         }
2507         changed |= ieee80211_handle_bss_capability(sdata,
2508                         le16_to_cpu(mgmt->u.beacon.capab_info),
2509                         erp_valid, erp_value);
2510
2511
2512         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2513             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2514                 struct ieee80211_supported_band *sband;
2515
2516                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2517
2518                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2519                                                   bssid, true);
2520         }
2521
2522         /* Note: country IE parsing is done for us by cfg80211 */
2523         if (elems.country_elem) {
2524                 /* TODO: IBSS also needs this */
2525                 if (elems.pwr_constr_elem)
2526                         ieee80211_handle_pwr_constr(sdata,
2527                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2528                                 elems.pwr_constr_elem,
2529                                 elems.pwr_constr_elem_len);
2530         }
2531
2532         ieee80211_bss_info_change_notify(sdata, changed);
2533 }
2534
2535 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2536                                   struct sk_buff *skb)
2537 {
2538         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2539         struct ieee80211_rx_status *rx_status;
2540         struct ieee80211_mgmt *mgmt;
2541         struct cfg80211_bss *bss = NULL;
2542         enum rx_mgmt_action rma = RX_MGMT_NONE;
2543         u16 fc;
2544
2545         rx_status = (struct ieee80211_rx_status *) skb->cb;
2546         mgmt = (struct ieee80211_mgmt *) skb->data;
2547         fc = le16_to_cpu(mgmt->frame_control);
2548
2549         mutex_lock(&ifmgd->mtx);
2550
2551         switch (fc & IEEE80211_FCTL_STYPE) {
2552         case IEEE80211_STYPE_BEACON:
2553                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2554                 break;
2555         case IEEE80211_STYPE_PROBE_RESP:
2556                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2557                 break;
2558         case IEEE80211_STYPE_AUTH:
2559                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2560                 break;
2561         case IEEE80211_STYPE_DEAUTH:
2562                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2563                 break;
2564         case IEEE80211_STYPE_DISASSOC:
2565                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2566                 break;
2567         case IEEE80211_STYPE_ASSOC_RESP:
2568         case IEEE80211_STYPE_REASSOC_RESP:
2569                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2570                 break;
2571         case IEEE80211_STYPE_ACTION:
2572                 switch (mgmt->u.action.category) {
2573                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2574                         ieee80211_sta_process_chanswitch(sdata,
2575                                         &mgmt->u.action.u.chan_switch.sw_elem,
2576                                         (void *)ifmgd->associated->priv,
2577                                         rx_status->mactime);
2578                         break;
2579                 }
2580         }
2581         mutex_unlock(&ifmgd->mtx);
2582
2583         switch (rma) {
2584         case RX_MGMT_NONE:
2585                 /* no action */
2586                 break;
2587         case RX_MGMT_CFG80211_DEAUTH:
2588                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2589                 break;
2590         case RX_MGMT_CFG80211_DISASSOC:
2591                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2592                 break;
2593         case RX_MGMT_CFG80211_RX_AUTH:
2594                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2595                 break;
2596         case RX_MGMT_CFG80211_RX_ASSOC:
2597                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2598                 break;
2599         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2600                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2601                 break;
2602         default:
2603                 WARN(1, "unexpected: %d", rma);
2604         }
2605 }
2606
2607 static void ieee80211_sta_timer(unsigned long data)
2608 {
2609         struct ieee80211_sub_if_data *sdata =
2610                 (struct ieee80211_sub_if_data *) data;
2611         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2612         struct ieee80211_local *local = sdata->local;
2613
2614         if (local->quiescing) {
2615                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2616                 return;
2617         }
2618
2619         ieee80211_queue_work(&local->hw, &sdata->work);
2620 }
2621
2622 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2623                                           u8 *bssid, u8 reason)
2624 {
2625         struct ieee80211_local *local = sdata->local;
2626         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2627         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2628
2629         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2630                                false, frame_buf);
2631         mutex_unlock(&ifmgd->mtx);
2632
2633         /*
2634          * must be outside lock due to cfg80211,
2635          * but that's not a problem.
2636          */
2637         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2638
2639         mutex_lock(&local->mtx);
2640         ieee80211_recalc_idle(local);
2641         mutex_unlock(&local->mtx);
2642
2643         mutex_lock(&ifmgd->mtx);
2644 }
2645
2646 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2647 {
2648         struct ieee80211_local *local = sdata->local;
2649         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2650         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2651
2652         lockdep_assert_held(&ifmgd->mtx);
2653
2654         if (WARN_ON_ONCE(!auth_data))
2655                 return -EINVAL;
2656
2657         auth_data->tries++;
2658
2659         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2660                 sdata_info(sdata, "authentication with %pM timed out\n",
2661                            auth_data->bss->bssid);
2662
2663                 /*
2664                  * Most likely AP is not in the range so remove the
2665                  * bss struct for that AP.
2666                  */
2667                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2668
2669                 return -ETIMEDOUT;
2670         }
2671
2672         drv_mgd_prepare_tx(local, sdata);
2673
2674         if (auth_data->bss->proberesp_ies) {
2675                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2676                            auth_data->bss->bssid, auth_data->tries,
2677                            IEEE80211_AUTH_MAX_TRIES);
2678
2679                 auth_data->expected_transaction = 2;
2680                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2681                                     auth_data->ie, auth_data->ie_len,
2682                                     auth_data->bss->bssid,
2683                                     auth_data->bss->bssid, NULL, 0, 0);
2684         } else {
2685                 const u8 *ssidie;
2686
2687                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2688                            auth_data->bss->bssid, auth_data->tries,
2689                            IEEE80211_AUTH_MAX_TRIES);
2690
2691                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2692                 if (!ssidie)
2693                         return -EINVAL;
2694                 /*
2695                  * Direct probe is sent to broadcast address as some APs
2696                  * will not answer to direct packet in unassociated state.
2697                  */
2698                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2699                                          NULL, 0, (u32) -1, true, false);
2700         }
2701
2702         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2703         run_again(ifmgd, auth_data->timeout);
2704
2705         return 0;
2706 }
2707
2708 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2709 {
2710         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2711         struct ieee80211_local *local = sdata->local;
2712
2713         lockdep_assert_held(&sdata->u.mgd.mtx);
2714
2715         assoc_data->tries++;
2716         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2717                 sdata_info(sdata, "association with %pM timed out\n",
2718                            assoc_data->bss->bssid);
2719
2720                 /*
2721                  * Most likely AP is not in the range so remove the
2722                  * bss struct for that AP.
2723                  */
2724                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2725
2726                 return -ETIMEDOUT;
2727         }
2728
2729         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2730                    assoc_data->bss->bssid, assoc_data->tries,
2731                    IEEE80211_ASSOC_MAX_TRIES);
2732         ieee80211_send_assoc(sdata);
2733
2734         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2735         run_again(&sdata->u.mgd, assoc_data->timeout);
2736
2737         return 0;
2738 }
2739
2740 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2741 {
2742         struct ieee80211_local *local = sdata->local;
2743         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2744
2745         mutex_lock(&ifmgd->mtx);
2746
2747         if (ifmgd->auth_data &&
2748             time_after(jiffies, ifmgd->auth_data->timeout)) {
2749                 if (ifmgd->auth_data->done) {
2750                         /*
2751                          * ok ... we waited for assoc but userspace didn't,
2752                          * so let's just kill the auth data
2753                          */
2754                         ieee80211_destroy_auth_data(sdata, false);
2755                 } else if (ieee80211_probe_auth(sdata)) {
2756                         u8 bssid[ETH_ALEN];
2757
2758                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2759
2760                         ieee80211_destroy_auth_data(sdata, false);
2761
2762                         mutex_unlock(&ifmgd->mtx);
2763                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2764                         mutex_lock(&ifmgd->mtx);
2765                 }
2766         } else if (ifmgd->auth_data)
2767                 run_again(ifmgd, ifmgd->auth_data->timeout);
2768
2769         if (ifmgd->assoc_data &&
2770             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2771                 if (!ifmgd->assoc_data->have_beacon ||
2772                     ieee80211_do_assoc(sdata)) {
2773                         u8 bssid[ETH_ALEN];
2774
2775                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2776
2777                         ieee80211_destroy_assoc_data(sdata, false);
2778
2779                         mutex_unlock(&ifmgd->mtx);
2780                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2781                         mutex_lock(&ifmgd->mtx);
2782                 }
2783         } else if (ifmgd->assoc_data)
2784                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2785
2786         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2787                             IEEE80211_STA_CONNECTION_POLL) &&
2788             ifmgd->associated) {
2789                 u8 bssid[ETH_ALEN];
2790                 int max_tries;
2791
2792                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2793
2794                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2795                         max_tries = max_nullfunc_tries;
2796                 else
2797                         max_tries = max_probe_tries;
2798
2799                 /* ACK received for nullfunc probing frame */
2800                 if (!ifmgd->probe_send_count)
2801                         ieee80211_reset_ap_probe(sdata);
2802                 else if (ifmgd->nullfunc_failed) {
2803                         if (ifmgd->probe_send_count < max_tries) {
2804                                 mlme_dbg(sdata,
2805                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2806                                          bssid, ifmgd->probe_send_count,
2807                                          max_tries);
2808                                 ieee80211_mgd_probe_ap_send(sdata);
2809                         } else {
2810                                 mlme_dbg(sdata,
2811                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2812                                          bssid);
2813                                 ieee80211_sta_connection_lost(sdata, bssid,
2814                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2815                         }
2816                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2817                         run_again(ifmgd, ifmgd->probe_timeout);
2818                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2819                         mlme_dbg(sdata,
2820                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2821                                  bssid, probe_wait_ms);
2822                         ieee80211_sta_connection_lost(sdata, bssid,
2823                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2824                 } else if (ifmgd->probe_send_count < max_tries) {
2825                         mlme_dbg(sdata,
2826                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2827                                  bssid, probe_wait_ms,
2828                                  ifmgd->probe_send_count, max_tries);
2829                         ieee80211_mgd_probe_ap_send(sdata);
2830                 } else {
2831                         /*
2832                          * We actually lost the connection ... or did we?
2833                          * Let's make sure!
2834                          */
2835                         wiphy_debug(local->hw.wiphy,
2836                                     "%s: No probe response from AP %pM"
2837                                     " after %dms, disconnecting.\n",
2838                                     sdata->name,
2839                                     bssid, probe_wait_ms);
2840
2841                         ieee80211_sta_connection_lost(sdata, bssid,
2842                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2843                 }
2844         }
2845
2846         mutex_unlock(&ifmgd->mtx);
2847
2848         mutex_lock(&local->mtx);
2849         ieee80211_recalc_idle(local);
2850         mutex_unlock(&local->mtx);
2851 }
2852
2853 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2854 {
2855         struct ieee80211_sub_if_data *sdata =
2856                 (struct ieee80211_sub_if_data *) data;
2857         struct ieee80211_local *local = sdata->local;
2858
2859         if (local->quiescing)
2860                 return;
2861
2862         ieee80211_queue_work(&sdata->local->hw,
2863                              &sdata->u.mgd.beacon_connection_loss_work);
2864 }
2865
2866 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2867 {
2868         struct ieee80211_sub_if_data *sdata =
2869                 (struct ieee80211_sub_if_data *) data;
2870         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2871         struct ieee80211_local *local = sdata->local;
2872
2873         if (local->quiescing)
2874                 return;
2875
2876         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2877 }
2878
2879 static void ieee80211_sta_monitor_work(struct work_struct *work)
2880 {
2881         struct ieee80211_sub_if_data *sdata =
2882                 container_of(work, struct ieee80211_sub_if_data,
2883                              u.mgd.monitor_work);
2884
2885         ieee80211_mgd_probe_ap(sdata, false);
2886 }
2887
2888 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2889 {
2890         u32 flags;
2891
2892         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2893                 __ieee80211_stop_poll(sdata);
2894
2895                 /* let's probe the connection once */
2896                 flags = sdata->local->hw.flags;
2897                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2898                         ieee80211_queue_work(&sdata->local->hw,
2899                                              &sdata->u.mgd.monitor_work);
2900                 /* and do all the other regular work too */
2901                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2902         }
2903 }
2904
2905 #ifdef CONFIG_PM
2906 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2907 {
2908         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2909
2910         /*
2911          * we need to use atomic bitops for the running bits
2912          * only because both timers might fire at the same
2913          * time -- the code here is properly synchronised.
2914          */
2915
2916         cancel_work_sync(&ifmgd->request_smps_work);
2917
2918         cancel_work_sync(&ifmgd->monitor_work);
2919         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2920         if (del_timer_sync(&ifmgd->timer))
2921                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2922
2923         cancel_work_sync(&ifmgd->chswitch_work);
2924         if (del_timer_sync(&ifmgd->chswitch_timer))
2925                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2926
2927         /* these will just be re-established on connection */
2928         del_timer_sync(&ifmgd->conn_mon_timer);
2929         del_timer_sync(&ifmgd->bcn_mon_timer);
2930 }
2931
2932 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2933 {
2934         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2935
2936         if (!ifmgd->associated)
2937                 return;
2938
2939         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2940                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2941                 mutex_lock(&ifmgd->mtx);
2942                 if (ifmgd->associated) {
2943                         mlme_dbg(sdata,
2944                                  "driver requested disconnect after resume\n");
2945                         ieee80211_sta_connection_lost(sdata,
2946                                 ifmgd->associated->bssid,
2947                                 WLAN_REASON_UNSPECIFIED);
2948                         mutex_unlock(&ifmgd->mtx);
2949                         return;
2950                 }
2951                 mutex_unlock(&ifmgd->mtx);
2952         }
2953
2954         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2955                 add_timer(&ifmgd->timer);
2956         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2957                 add_timer(&ifmgd->chswitch_timer);
2958         ieee80211_sta_reset_beacon_monitor(sdata);
2959
2960         mutex_lock(&sdata->local->mtx);
2961         ieee80211_restart_sta_timer(sdata);
2962         mutex_unlock(&sdata->local->mtx);
2963 }
2964 #endif
2965
2966 /* interface setup */
2967 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2968 {
2969         struct ieee80211_if_managed *ifmgd;
2970
2971         ifmgd = &sdata->u.mgd;
2972         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2973         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2974         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2975                   ieee80211_beacon_connection_loss_work);
2976         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2977         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2978                     (unsigned long) sdata);
2979         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2980                     (unsigned long) sdata);
2981         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2982                     (unsigned long) sdata);
2983         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2984                     (unsigned long) sdata);
2985
2986         ifmgd->flags = 0;
2987         ifmgd->powersave = sdata->wdev.ps;
2988         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2989         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2990
2991         mutex_init(&ifmgd->mtx);
2992
2993         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2994                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2995         else
2996                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2997 }
2998
2999 /* scan finished notification */
3000 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3001 {
3002         struct ieee80211_sub_if_data *sdata;
3003
3004         /* Restart STA timers */
3005         rcu_read_lock();
3006         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3007                 ieee80211_restart_sta_timer(sdata);
3008         rcu_read_unlock();
3009 }
3010
3011 int ieee80211_max_network_latency(struct notifier_block *nb,
3012                                   unsigned long data, void *dummy)
3013 {
3014         s32 latency_usec = (s32) data;
3015         struct ieee80211_local *local =
3016                 container_of(nb, struct ieee80211_local,
3017                              network_latency_notifier);
3018
3019         mutex_lock(&local->iflist_mtx);
3020         ieee80211_recalc_ps(local, latency_usec);
3021         mutex_unlock(&local->iflist_mtx);
3022
3023         return 0;
3024 }
3025
3026 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3027                                      struct cfg80211_bss *cbss, bool assoc)
3028 {
3029         struct ieee80211_local *local = sdata->local;
3030         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3031         struct ieee80211_bss *bss = (void *)cbss->priv;
3032         struct sta_info *sta = NULL;
3033         bool have_sta = false;
3034         int err;
3035         int ht_cfreq;
3036         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3037         const u8 *ht_oper_ie;
3038         const struct ieee80211_ht_operation *ht_oper = NULL;
3039         struct ieee80211_supported_band *sband;
3040
3041         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3042                 return -EINVAL;
3043
3044         if (assoc) {
3045                 rcu_read_lock();
3046                 have_sta = sta_info_get(sdata, cbss->bssid);
3047                 rcu_read_unlock();
3048         }
3049
3050         if (!have_sta) {
3051                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3052                 if (!sta)
3053                         return -ENOMEM;
3054         }
3055
3056         mutex_lock(&local->mtx);
3057         ieee80211_recalc_idle(sdata->local);
3058         mutex_unlock(&local->mtx);
3059
3060         /* switch to the right channel */
3061         sband = local->hw.wiphy->bands[cbss->channel->band];
3062
3063         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3064
3065         if (sband->ht_cap.ht_supported) {
3066                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3067                                               cbss->information_elements,
3068                                               cbss->len_information_elements);
3069                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3070                         ht_oper = (void *)(ht_oper_ie + 2);
3071         }
3072
3073         if (ht_oper) {
3074                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3075                                                           cbss->channel->band);
3076                 /* check that channel matches the right operating channel */
3077                 if (cbss->channel->center_freq != ht_cfreq) {
3078                         /*
3079                          * It's possible that some APs are confused here;
3080                          * Netgear WNDR3700 sometimes reports 4 higher than
3081                          * the actual channel in association responses, but
3082                          * since we look at probe response/beacon data here
3083                          * it should be OK.
3084                          */
3085                         sdata_info(sdata,
3086                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3087                                    cbss->channel->center_freq,
3088                                    ht_cfreq, ht_oper->primary_chan,
3089                                    cbss->channel->band);
3090                         ht_oper = NULL;
3091                 }
3092         }
3093
3094         if (ht_oper) {
3095                 channel_type = NL80211_CHAN_HT20;
3096
3097                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3098                         switch (ht_oper->ht_param &
3099                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3100                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3101                                 channel_type = NL80211_CHAN_HT40PLUS;
3102                                 break;
3103                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3104                                 channel_type = NL80211_CHAN_HT40MINUS;
3105                                 break;
3106                         }
3107                 }
3108         }
3109
3110         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3111                 /* can only fail due to HT40+/- mismatch */
3112                 channel_type = NL80211_CHAN_HT20;
3113                 sdata_info(sdata,
3114                            "disabling 40 MHz due to multi-vif mismatch\n");
3115                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3116                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3117                                                     channel_type));
3118         }
3119
3120         local->oper_channel = cbss->channel;
3121         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3122
3123         if (sta) {
3124                 u32 rates = 0, basic_rates = 0;
3125                 bool have_higher_than_11mbit;
3126                 int min_rate = INT_MAX, min_rate_index = -1;
3127
3128                 ieee80211_get_rates(sband, bss->supp_rates,
3129                                     bss->supp_rates_len,
3130                                     &rates, &basic_rates,
3131                                     &have_higher_than_11mbit,
3132                                     &min_rate, &min_rate_index);
3133
3134                 /*
3135                  * This used to be a workaround for basic rates missing
3136                  * in the association response frame. Now that we no
3137                  * longer use the basic rates from there, it probably
3138                  * doesn't happen any more, but keep the workaround so
3139                  * in case some *other* APs are buggy in different ways
3140                  * we can connect -- with a warning.
3141                  */
3142                 if (!basic_rates && min_rate_index >= 0) {
3143                         sdata_info(sdata,
3144                                    "No basic rates, using min rate instead\n");
3145                         basic_rates = BIT(min_rate_index);
3146                 }
3147
3148                 sta->sta.supp_rates[cbss->channel->band] = rates;
3149                 sdata->vif.bss_conf.basic_rates = basic_rates;
3150
3151                 /* cf. IEEE 802.11 9.2.12 */
3152                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3153                     have_higher_than_11mbit)
3154                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3155                 else
3156                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3157
3158                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3159
3160                 /* set timing information */
3161                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3162                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3163                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3164
3165                 /* tell driver about BSSID, basic rates and timing */
3166                 ieee80211_bss_info_change_notify(sdata,
3167                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3168                         BSS_CHANGED_BEACON_INT);
3169
3170                 if (assoc)
3171                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3172
3173                 err = sta_info_insert(sta);
3174                 sta = NULL;
3175                 if (err) {
3176                         sdata_info(sdata,
3177                                    "failed to insert STA entry for the AP (error %d)\n",
3178                                    err);
3179                         return err;
3180                 }
3181         } else
3182                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3183
3184         return 0;
3185 }
3186
3187 /* config hooks */
3188 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3189                        struct cfg80211_auth_request *req)
3190 {
3191         struct ieee80211_local *local = sdata->local;
3192         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3193         struct ieee80211_mgd_auth_data *auth_data;
3194         u16 auth_alg;
3195         int err;
3196
3197         /* prepare auth data structure */
3198
3199         switch (req->auth_type) {
3200         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3201                 auth_alg = WLAN_AUTH_OPEN;
3202                 break;
3203         case NL80211_AUTHTYPE_SHARED_KEY:
3204                 if (IS_ERR(local->wep_tx_tfm))
3205                         return -EOPNOTSUPP;
3206                 auth_alg = WLAN_AUTH_SHARED_KEY;
3207                 break;
3208         case NL80211_AUTHTYPE_FT:
3209                 auth_alg = WLAN_AUTH_FT;
3210                 break;
3211         case NL80211_AUTHTYPE_NETWORK_EAP:
3212                 auth_alg = WLAN_AUTH_LEAP;
3213                 break;
3214         default:
3215                 return -EOPNOTSUPP;
3216         }
3217
3218         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3219         if (!auth_data)
3220                 return -ENOMEM;
3221
3222         auth_data->bss = req->bss;
3223
3224         if (req->ie && req->ie_len) {
3225                 memcpy(auth_data->ie, req->ie, req->ie_len);
3226                 auth_data->ie_len = req->ie_len;
3227         }
3228
3229         if (req->key && req->key_len) {
3230                 auth_data->key_len = req->key_len;
3231                 auth_data->key_idx = req->key_idx;
3232                 memcpy(auth_data->key, req->key, req->key_len);
3233         }
3234
3235         auth_data->algorithm = auth_alg;
3236
3237         /* try to authenticate/probe */
3238
3239         mutex_lock(&ifmgd->mtx);
3240
3241         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3242             ifmgd->assoc_data) {
3243                 err = -EBUSY;
3244                 goto err_free;
3245         }
3246
3247         if (ifmgd->auth_data)
3248                 ieee80211_destroy_auth_data(sdata, false);
3249
3250         /* prep auth_data so we don't go into idle on disassoc */
3251         ifmgd->auth_data = auth_data;
3252
3253         if (ifmgd->associated)
3254                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3255
3256         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3257
3258         err = ieee80211_prep_connection(sdata, req->bss, false);
3259         if (err)
3260                 goto err_clear;
3261
3262         err = ieee80211_probe_auth(sdata);
3263         if (err) {
3264                 sta_info_destroy_addr(sdata, req->bss->bssid);
3265                 goto err_clear;
3266         }
3267
3268         /* hold our own reference */
3269         cfg80211_ref_bss(auth_data->bss);
3270         err = 0;
3271         goto out_unlock;
3272
3273  err_clear:
3274         ifmgd->auth_data = NULL;
3275  err_free:
3276         kfree(auth_data);
3277  out_unlock:
3278         mutex_unlock(&ifmgd->mtx);
3279
3280         return err;
3281 }
3282
3283 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3284                         struct cfg80211_assoc_request *req)
3285 {
3286         struct ieee80211_local *local = sdata->local;
3287         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3288         struct ieee80211_bss *bss = (void *)req->bss->priv;
3289         struct ieee80211_mgd_assoc_data *assoc_data;
3290         struct ieee80211_supported_band *sband;
3291         const u8 *ssidie, *ht_ie;
3292         int i, err;
3293
3294         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3295         if (!ssidie)
3296                 return -EINVAL;
3297
3298         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3299         if (!assoc_data)
3300                 return -ENOMEM;
3301
3302         mutex_lock(&ifmgd->mtx);
3303
3304         if (ifmgd->associated)
3305                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3306
3307         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3308                 err = -EBUSY;
3309                 goto err_free;
3310         }
3311
3312         if (ifmgd->assoc_data) {
3313                 err = -EBUSY;
3314                 goto err_free;
3315         }
3316
3317         if (ifmgd->auth_data) {
3318                 bool match;
3319
3320                 /* keep sta info, bssid if matching */
3321                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3322                 ieee80211_destroy_auth_data(sdata, match);
3323         }
3324
3325         /* prepare assoc data */
3326
3327         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3328         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3329         ifmgd->flags &= ~IEEE80211_STA_DISABLE_VHT;
3330
3331         ifmgd->beacon_crc_valid = false;
3332
3333         /*
3334          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3335          * We still associate in non-HT mode (11a/b/g) if any one of these
3336          * ciphers is configured as pairwise.
3337          * We can set this to true for non-11n hardware, that'll be checked
3338          * separately along with the peer capabilities.
3339          */
3340         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3341                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3342                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3343                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3344                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3345                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3346                         netdev_info(sdata->dev,
3347                                     "disabling HT/VHT due to WEP/TKIP use\n");
3348                 }
3349         }
3350
3351         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3352                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3353                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3354         }
3355
3356         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3357         sband = local->hw.wiphy->bands[req->bss->channel->band];
3358         if (!sband->ht_cap.ht_supported ||
3359             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3360                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3361                 netdev_info(sdata->dev,
3362                             "disabling HT as WMM/QoS is not supported\n");
3363         }
3364
3365         /* disable VHT if we don't support it or the AP doesn't use WMM */
3366         if (!sband->vht_cap.vht_supported ||
3367             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3368                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3369                 netdev_info(sdata->dev,
3370                             "disabling VHT as WMM/QoS is not supported\n");
3371         }
3372
3373         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3374         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3375                sizeof(ifmgd->ht_capa_mask));
3376
3377         if (req->ie && req->ie_len) {
3378                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3379                 assoc_data->ie_len = req->ie_len;
3380         }
3381
3382         assoc_data->bss = req->bss;
3383
3384         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3385                 if (ifmgd->powersave)
3386                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3387                 else
3388                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3389         } else
3390                 ifmgd->ap_smps = ifmgd->req_smps;
3391
3392         assoc_data->capability = req->bss->capability;
3393         assoc_data->wmm = bss->wmm_used &&
3394                           (local->hw.queues >= IEEE80211_NUM_ACS);
3395         assoc_data->supp_rates = bss->supp_rates;
3396         assoc_data->supp_rates_len = bss->supp_rates_len;
3397
3398         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3399         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3400                 assoc_data->ap_ht_param =
3401                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3402         else
3403                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3404
3405         if (bss->wmm_used && bss->uapsd_supported &&
3406             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3407                 assoc_data->uapsd = true;
3408                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3409         } else {
3410                 assoc_data->uapsd = false;
3411                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3412         }
3413
3414         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3415         assoc_data->ssid_len = ssidie[1];
3416
3417         if (req->prev_bssid)
3418                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3419
3420         if (req->use_mfp) {
3421                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3422                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3423         } else {
3424                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3425                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3426         }
3427
3428         if (req->crypto.control_port)
3429                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3430         else
3431                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3432
3433         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3434         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3435
3436         /* kick off associate process */
3437
3438         ifmgd->assoc_data = assoc_data;
3439
3440         err = ieee80211_prep_connection(sdata, req->bss, true);
3441         if (err)
3442                 goto err_clear;
3443
3444         if (!bss->dtim_period &&
3445             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3446                 /*
3447                  * Wait up to one beacon interval ...
3448                  * should this be more if we miss one?
3449                  */
3450                 sdata_info(sdata, "waiting for beacon from %pM\n",
3451                            ifmgd->bssid);
3452                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3453         } else {
3454                 assoc_data->have_beacon = true;
3455                 assoc_data->sent_assoc = false;
3456                 assoc_data->timeout = jiffies;
3457         }
3458         run_again(ifmgd, assoc_data->timeout);
3459
3460         if (bss->corrupt_data) {
3461                 char *corrupt_type = "data";
3462                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3463                         if (bss->corrupt_data &
3464                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3465                                 corrupt_type = "beacon and probe response";
3466                         else
3467                                 corrupt_type = "beacon";
3468                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3469                         corrupt_type = "probe response";
3470                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3471                            corrupt_type);
3472         }
3473
3474         err = 0;
3475         goto out;
3476  err_clear:
3477         ifmgd->assoc_data = NULL;
3478  err_free:
3479         kfree(assoc_data);
3480  out:
3481         mutex_unlock(&ifmgd->mtx);
3482
3483         return err;
3484 }
3485
3486 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3487                          struct cfg80211_deauth_request *req)
3488 {
3489         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3490         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3491
3492         mutex_lock(&ifmgd->mtx);
3493
3494         if (ifmgd->auth_data) {
3495                 ieee80211_destroy_auth_data(sdata, false);
3496                 mutex_unlock(&ifmgd->mtx);
3497                 return 0;
3498         }
3499
3500         sdata_info(sdata,
3501                    "deauthenticating from %pM by local choice (reason=%d)\n",
3502                    req->bssid, req->reason_code);
3503
3504         if (ifmgd->associated &&
3505             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3506                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3507                                        req->reason_code, true, frame_buf);
3508         } else {
3509                 drv_mgd_prepare_tx(sdata->local, sdata);
3510                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3511                                                IEEE80211_STYPE_DEAUTH,
3512                                                req->reason_code, true,
3513                                                frame_buf);
3514         }
3515
3516         mutex_unlock(&ifmgd->mtx);
3517
3518         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3519
3520         mutex_lock(&sdata->local->mtx);
3521         ieee80211_recalc_idle(sdata->local);
3522         mutex_unlock(&sdata->local->mtx);
3523
3524         return 0;
3525 }
3526
3527 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3528                            struct cfg80211_disassoc_request *req)
3529 {
3530         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3531         u8 bssid[ETH_ALEN];
3532         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3533
3534         mutex_lock(&ifmgd->mtx);
3535
3536         /*
3537          * cfg80211 should catch this ... but it's racy since
3538          * we can receive a disassoc frame, process it, hand it
3539          * to cfg80211 while that's in a locked section already
3540          * trying to tell us that the user wants to disconnect.
3541          */
3542         if (ifmgd->associated != req->bss) {
3543                 mutex_unlock(&ifmgd->mtx);
3544                 return -ENOLINK;
3545         }
3546
3547         sdata_info(sdata,
3548                    "disassociating from %pM by local choice (reason=%d)\n",
3549                    req->bss->bssid, req->reason_code);
3550
3551         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3552         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3553                                req->reason_code, !req->local_state_change,
3554                                frame_buf);
3555         mutex_unlock(&ifmgd->mtx);
3556
3557         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3558
3559         mutex_lock(&sdata->local->mtx);
3560         ieee80211_recalc_idle(sdata->local);
3561         mutex_unlock(&sdata->local->mtx);
3562
3563         return 0;
3564 }
3565
3566 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3567 {
3568         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3569
3570         mutex_lock(&ifmgd->mtx);
3571         if (ifmgd->assoc_data)
3572                 ieee80211_destroy_assoc_data(sdata, false);
3573         if (ifmgd->auth_data)
3574                 ieee80211_destroy_auth_data(sdata, false);
3575         del_timer_sync(&ifmgd->timer);
3576         mutex_unlock(&ifmgd->mtx);
3577 }
3578
3579 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3580                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3581                                gfp_t gfp)
3582 {
3583         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3584
3585         trace_api_cqm_rssi_notify(sdata, rssi_event);
3586
3587         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3588 }
3589 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);