net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  34 #define IEEE80211_AUTH_MAX_TRIES 3
  35 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
  36 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  37 #define IEEE80211_ASSOC_MAX_TRIES 3
  38
  39 static int max_nullfunc_tries = 2;
  40 module_param(max_nullfunc_tries, int, 0644);
  41 MODULE_PARM_DESC(max_nullfunc_tries,
  42                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  43
  44 static int max_probe_tries = 5;
  45 module_param(max_probe_tries, int, 0644);
  46 MODULE_PARM_DESC(max_probe_tries,
  47                  "Maximum probe tries before disconnecting (reason 4).");
  48
  49 /*
  50  * Beacon loss timeout is calculated as N frames times the
  51  * advertised beacon interval.  This may need to be somewhat
  52  * higher than what hardware might detect to account for
  53  * delays in the host processing frames. But since we also
  54  * probe on beacon miss before declaring the connection lost
  55  * default to what we want.
  56  */
  57 #define IEEE80211_BEACON_LOSS_COUNT     7
  58
  59 /*
  60  * Time the connection can be idle before we probe
  61  * it to see if we can still talk to the AP.
  62  */
  63 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  64 /*
  65  * Time we wait for a probe response after sending
  66  * a probe request because of beacon loss or for
  67  * checking the connection still works.
  68  */
  69 static int probe_wait_ms = 500;
  70 module_param(probe_wait_ms, int, 0644);
  71 MODULE_PARM_DESC(probe_wait_ms,
  72                  "Maximum time(ms) to wait for probe response"
  73                  " before disconnecting (reason 4).");
  74
  75 /*
  76  * Weight given to the latest Beacon frame when calculating average signal
  77  * strength for Beacon frames received in the current BSS. This must be
  78  * between 1 and 15.
  79  */
  80 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  81
  82 /*
  83  * How many Beacon frames need to have been used in average signal strength
  84  * before starting to indicate signal change events.
  85  */
  86 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  87
  88 #define TMR_RUNNING_TIMER       0
  89 #define TMR_RUNNING_CHANSW      1
  90
  91 #define DEAUTH_DISASSOC_LEN     (24 /* hdr */ + 2 /* reason */)
  92
  93 /*
  94  * All cfg80211 functions have to be called outside a locked
  95  * section so that they can acquire a lock themselves... This
  96  * is much simpler than queuing up things in cfg80211, but we
  97  * do need some indirection for that here.
  98  */
  99 enum rx_mgmt_action {
 100         /* no action required */
 101         RX_MGMT_NONE,
 102
 103         /* caller must call cfg80211_send_deauth() */
 104         RX_MGMT_CFG80211_DEAUTH,
 105
 106         /* caller must call cfg80211_send_disassoc() */
 107         RX_MGMT_CFG80211_DISASSOC,
 108
 109         /* caller must call cfg80211_send_rx_auth() */
 110         RX_MGMT_CFG80211_RX_AUTH,
 111
 112         /* caller must call cfg80211_send_rx_assoc() */
 113         RX_MGMT_CFG80211_RX_ASSOC,
 114
 115         /* caller must call cfg80211_send_assoc_timeout() */
 116         RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 117 };
 118
 119 /* utils */
 120 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 121 {
 122         lockdep_assert_held(&ifmgd->mtx);
 123 }
 124
 125 /*
 126  * We can have multiple work items (and connection probing)
 127  * scheduling this timer, but we need to take care to only
 128  * reschedule it when it should fire _earlier_ than it was
 129  * asked for before, or if it's not pending right now. This
 130  * function ensures that. Note that it then is required to
 131  * run this function for all timeouts after the first one
 132  * has happened -- the work that runs from this timer will
 133  * do that.
 134  */
 135 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 136 {
 137         ASSERT_MGD_MTX(ifmgd);
 138
 139         if (!timer_pending(&ifmgd->timer) ||
 140             time_before(timeout, ifmgd->timer.expires))
 141                 mod_timer(&ifmgd->timer, timeout);
 142 }
 143
 144 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 145 {
 146         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 147                 return;
 148
 149         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 150                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 151 }
 152
 153 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 154 {
 155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 156
 157         if (unlikely(!sdata->u.mgd.associated))
 158                 return;
 159
 160         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 161                 return;
 162
 163         mod_timer(&sdata->u.mgd.conn_mon_timer,
 164                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 165
 166         ifmgd->probe_send_count = 0;
 167 }
 168
 169 static int ecw2cw(int ecw)
 170 {
 171         return (1 << ecw) - 1;
 172 }
 173
 174 /*
 175  * ieee80211_enable_ht should be called only after the operating band
 176  * has been determined as ht configuration depends on the hw's
 177  * HT abilities for a specific band.
 178  */
 179 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 180                                struct ieee80211_ht_info *hti,
 181                                const u8 *bssid, u16 ap_ht_cap_flags,
 182                                bool beacon_htcap_ie)
 183 {
 184         struct ieee80211_local *local = sdata->local;
 185         struct ieee80211_supported_band *sband;
 186         struct sta_info *sta;
 187         u32 changed = 0;
 188         int hti_cfreq;
 189         u16 ht_opmode;
 190         bool enable_ht = true;
 191         enum nl80211_channel_type prev_chantype;
 192         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 193
 194         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 195
 196         prev_chantype = sdata->vif.bss_conf.channel_type;
 197
 198         /* HT is not supported */
 199         if (!sband->ht_cap.ht_supported)
 200                 enable_ht = false;
 201
 202         if (enable_ht) {
 203                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
 204                                                            sband->band);
 205                 /* check that channel matches the right operating channel */
 206                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
 207                         /* Some APs mess this up, evidently.
 208                          * Netgear WNDR3700 sometimes reports 4 higher than
 209                          * the actual channel, for instance.
 210                          */
 211                         printk(KERN_DEBUG
 212                                "%s: Wrong control channel in association"
 213                                " response: configured center-freq: %d"
 214                                " hti-cfreq: %d  hti->control_chan: %d"
 215                                " band: %d.  Disabling HT.\n",
 216                                sdata->name,
 217                                local->hw.conf.channel->center_freq,
 218                                hti_cfreq, hti->control_chan,
 219                                sband->band);
 220                         enable_ht = false;
 221                 }
 222         }
 223
 224         if (enable_ht) {
 225                 channel_type = NL80211_CHAN_HT20;
 226
 227                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 228                     !ieee80111_cfg_override_disables_ht40(sdata) &&
 229                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 230                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 231                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 232                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 233                                 if (!(local->hw.conf.channel->flags &
 234                                     IEEE80211_CHAN_NO_HT40PLUS))
 235                                         channel_type = NL80211_CHAN_HT40PLUS;
 236                                 break;
 237                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 238                                 if (!(local->hw.conf.channel->flags &
 239                                     IEEE80211_CHAN_NO_HT40MINUS))
 240                                         channel_type = NL80211_CHAN_HT40MINUS;
 241                                 break;
 242                         }
 243                 }
 244         }
 245
 246         if (local->tmp_channel)
 247                 local->tmp_channel_type = channel_type;
 248
 249         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 250                 /* can only fail due to HT40+/- mismatch */
 251                 channel_type = NL80211_CHAN_HT20;
 252                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 253         }
 254
 255         if (beacon_htcap_ie && (prev_chantype != channel_type)) {
 256                 /*
 257                  * Whenever the AP announces the HT mode change that can be
 258                  * 40MHz intolerant or etc., it would be safer to stop tx
 259                  * queues before doing hw config to avoid buffer overflow.
 260                  */
 261                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 262                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 263
 264                 /* flush out all packets */
 265                 synchronize_net();
 266
 267                 drv_flush(local, false);
 268         }
 269
 270         /* channel_type change automatically detected */
 271         ieee80211_hw_config(local, 0);
 272
 273         if (prev_chantype != channel_type) {
 274                 rcu_read_lock();
 275                 sta = sta_info_get(sdata, bssid);
 276                 if (sta)
 277                         rate_control_rate_update(local, sband, sta,
 278                                                  IEEE80211_RC_HT_CHANGED,
 279                                                  channel_type);
 280                 rcu_read_unlock();
 281
 282                 if (beacon_htcap_ie)
 283                         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 284                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 285         }
 286
 287         ht_opmode = le16_to_cpu(hti->operation_mode);
 288
 289         /* if bss configuration changed store the new one */
 290         if (sdata->ht_opmode_valid != enable_ht ||
 291             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 292             prev_chantype != channel_type) {
 293                 changed |= BSS_CHANGED_HT;
 294                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 295                 sdata->ht_opmode_valid = enable_ht;
 296         }
 297
 298         return changed;
 299 }
 300
 301 /* frame sending functions */
 302
 303 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 304                                       struct ieee80211_supported_band *sband,
 305                                       u32 *rates)
 306 {
 307         int i, j, count;
 308         *rates = 0;
 309         count = 0;
 310         for (i = 0; i < supp_rates_len; i++) {
 311                 int rate = (supp_rates[i] & 0x7F) * 5;
 312
 313                 for (j = 0; j < sband->n_bitrates; j++)
 314                         if (sband->bitrates[j].bitrate == rate) {
 315                                 *rates |= BIT(j);
 316                                 count++;
 317                                 break;
 318                         }
 319         }
 320
 321         return count;
 322 }
 323
 324 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 325                                 struct sk_buff *skb, const u8 *ht_info_ie,
 326                                 struct ieee80211_supported_band *sband,
 327                                 struct ieee80211_channel *channel,
 328                                 enum ieee80211_smps_mode smps)
 329 {
 330         struct ieee80211_ht_info *ht_info;
 331         u8 *pos;
 332         u32 flags = channel->flags;
 333         u16 cap;
 334         struct ieee80211_sta_ht_cap ht_cap;
 335
 336         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 337
 338         if (!sband->ht_cap.ht_supported)
 339                 return;
 340
 341         if (!ht_info_ie)
 342                 return;
 343
 344         if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
 345                 return;
 346
 347         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 348         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 349
 350         ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
 351
 352         /* determine capability flags */
 353         cap = ht_cap.cap;
 354
 355         switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 356         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 357                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 358                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 359                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 360                 }
 361                 break;
 362         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 363                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 364                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 365                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 366                 }
 367                 break;
 368         }
 369
 370         /* set SM PS mode properly */
 371         cap &= ~IEEE80211_HT_CAP_SM_PS;
 372         switch (smps) {
 373         case IEEE80211_SMPS_AUTOMATIC:
 374         case IEEE80211_SMPS_NUM_MODES:
 375                 WARN_ON(1);
 376         case IEEE80211_SMPS_OFF:
 377                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 378                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 379                 break;
 380         case IEEE80211_SMPS_STATIC:
 381                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 382                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 383                 break;
 384         case IEEE80211_SMPS_DYNAMIC:
 385                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 386                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 387                 break;
 388         }
 389
 390         /* reserve and fill IE */
 391         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 392         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 393 }
 394
 395 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 396 {
 397         struct ieee80211_local *local = sdata->local;
 398         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 399         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 400         struct sk_buff *skb;
 401         struct ieee80211_mgmt *mgmt;
 402         u8 *pos, qos_info;
 403         size_t offset = 0, noffset;
 404         int i, count, rates_len, supp_rates_len;
 405         u16 capab;
 406         struct ieee80211_supported_band *sband;
 407         u32 rates = 0;
 408         struct ieee80211_bss *bss = (void *)assoc_data->bss->priv;
 409
 410         lockdep_assert_held(&ifmgd->mtx);
 411
 412         sband = local->hw.wiphy->bands[local->oper_channel->band];
 413
 414         if (assoc_data->supp_rates_len) {
 415                 /*
 416                  * Get all rates supported by the device and the AP as
 417                  * some APs don't like getting a superset of their rates
 418                  * in the association request (e.g. D-Link DAP 1353 in
 419                  * b-only mode)...
 420                  */
 421                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 422                                                        assoc_data->supp_rates_len,
 423                                                        sband, &rates);
 424         } else {
 425                 /*
 426                  * In case AP not provide any supported rates information
 427                  * before association, we send information element(s) with
 428                  * all rates that we support.
 429                  */
 430                 rates = ~0;
 431                 rates_len = sband->n_bitrates;
 432         }
 433
 434         skb = alloc_skb(local->hw.extra_tx_headroom +
 435                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 436                         2 + assoc_data->ssid_len + /* SSID */
 437                         4 + rates_len + /* (extended) rates */
 438                         4 + /* power capability */
 439                         2 + 2 * sband->n_channels + /* supported channels */
 440                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 441                         assoc_data->ie_len + /* extra IEs */
 442                         9, /* WMM */
 443                         GFP_KERNEL);
 444         if (!skb)
 445                 return;
 446
 447         skb_reserve(skb, local->hw.extra_tx_headroom);
 448
 449         capab = WLAN_CAPABILITY_ESS;
 450
 451         if (sband->band == IEEE80211_BAND_2GHZ) {
 452                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 453                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 454                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 455                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 456         }
 457
 458         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 459                 capab |= WLAN_CAPABILITY_PRIVACY;
 460
 461         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 462             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 463                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 464
 465         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 466         memset(mgmt, 0, 24);
 467         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 468         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 469         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 470
 471         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 472                 skb_put(skb, 10);
 473                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 474                                                   IEEE80211_STYPE_REASSOC_REQ);
 475                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 476                 mgmt->u.reassoc_req.listen_interval =
 477                                 cpu_to_le16(local->hw.conf.listen_interval);
 478                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 479                        ETH_ALEN);
 480         } else {
 481                 skb_put(skb, 4);
 482                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 483                                                   IEEE80211_STYPE_ASSOC_REQ);
 484                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 485                 mgmt->u.assoc_req.listen_interval =
 486                                 cpu_to_le16(local->hw.conf.listen_interval);
 487         }
 488
 489         /* SSID */
 490         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 491         *pos++ = WLAN_EID_SSID;
 492         *pos++ = assoc_data->ssid_len;
 493         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 494
 495         /* add all rates which were marked to be used above */
 496         supp_rates_len = rates_len;
 497         if (supp_rates_len > 8)
 498                 supp_rates_len = 8;
 499
 500         pos = skb_put(skb, supp_rates_len + 2);
 501         *pos++ = WLAN_EID_SUPP_RATES;
 502         *pos++ = supp_rates_len;
 503
 504         count = 0;
 505         for (i = 0; i < sband->n_bitrates; i++) {
 506                 if (BIT(i) & rates) {
 507                         int rate = sband->bitrates[i].bitrate;
 508                         *pos++ = (u8) (rate / 5);
 509                         if (++count == 8)
 510                                 break;
 511                 }
 512         }
 513
 514         if (rates_len > count) {
 515                 pos = skb_put(skb, rates_len - count + 2);
 516                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 517                 *pos++ = rates_len - count;
 518
 519                 for (i++; i < sband->n_bitrates; i++) {
 520                         if (BIT(i) & rates) {
 521                                 int rate = sband->bitrates[i].bitrate;
 522                                 *pos++ = (u8) (rate / 5);
 523                         }
 524                 }
 525         }
 526
 527         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 528                 /* 1. power capabilities */
 529                 pos = skb_put(skb, 4);
 530                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 531                 *pos++ = 2;
 532                 *pos++ = 0; /* min tx power */
 533                 *pos++ = local->oper_channel->max_power; /* max tx power */
 534
 535                 /* 2. supported channels */
 536                 /* TODO: get this in reg domain format */
 537                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 538                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 539                 *pos++ = 2 * sband->n_channels;
 540                 for (i = 0; i < sband->n_channels; i++) {
 541                         *pos++ = ieee80211_frequency_to_channel(
 542                                         sband->channels[i].center_freq);
 543                         *pos++ = 1; /* one channel in the subband*/
 544                 }
 545         }
 546
 547         /* if present, add any custom IEs that go before HT */
 548         if (assoc_data->ie_len && assoc_data->ie) {
 549                 static const u8 before_ht[] = {
 550                         WLAN_EID_SSID,
 551                         WLAN_EID_SUPP_RATES,
 552                         WLAN_EID_EXT_SUPP_RATES,
 553                         WLAN_EID_PWR_CAPABILITY,
 554                         WLAN_EID_SUPPORTED_CHANNELS,
 555                         WLAN_EID_RSN,
 556                         WLAN_EID_QOS_CAPA,
 557                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 558                         WLAN_EID_MOBILITY_DOMAIN,
 559                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 560                 };
 561                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 562                                              before_ht, ARRAY_SIZE(before_ht),
 563                                              offset);
 564                 pos = skb_put(skb, noffset - offset);
 565                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 566                 offset = noffset;
 567         }
 568
 569         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N) &&
 570             bss->wmm_used && local->hw.queues >= 4)
 571                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ht_information_ie,
 572                                     sband, local->oper_channel, ifmgd->ap_smps);
 573
 574         /* if present, add any custom non-vendor IEs that go after HT */
 575         if (assoc_data->ie_len && assoc_data->ie) {
 576                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 577                                                     assoc_data->ie_len,
 578                                                     offset);
 579                 pos = skb_put(skb, noffset - offset);
 580                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 581                 offset = noffset;
 582         }
 583
 584         if (assoc_data->wmm_used && local->hw.queues >= 4) {
 585                 if (assoc_data->uapsd_used) {
 586                         qos_info = local->uapsd_queues;
 587                         qos_info |= (local->uapsd_max_sp_len <<
 588                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 589                 } else {
 590                         qos_info = 0;
 591                 }
 592
 593                 pos = skb_put(skb, 9);
 594                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 595                 *pos++ = 7; /* len */
 596                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 597                 *pos++ = 0x50;
 598                 *pos++ = 0xf2;
 599                 *pos++ = 2; /* WME */
 600                 *pos++ = 0; /* WME info */
 601                 *pos++ = 1; /* WME ver */
 602                 *pos++ = qos_info;
 603         }
 604
 605         /* add any remaining custom (i.e. vendor specific here) IEs */
 606         if (assoc_data->ie_len && assoc_data->ie) {
 607                 noffset = assoc_data->ie_len;
 608                 pos = skb_put(skb, noffset - offset);
 609                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 610         }
 611
 612         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 613         ieee80211_tx_skb(sdata, skb);
 614 }
 615
 616 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 617                                            const u8 *bssid, u16 stype,
 618                                            u16 reason, bool send_frame,
 619                                            u8 *frame_buf)
 620 {
 621         struct ieee80211_local *local = sdata->local;
 622         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 623         struct sk_buff *skb;
 624         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 625
 626         /* build frame */
 627         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 628         mgmt->duration = 0; /* initialize only */
 629         mgmt->seq_ctrl = 0; /* initialize only */
 630         memcpy(mgmt->da, bssid, ETH_ALEN);
 631         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 632         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 633         /* u.deauth.reason_code == u.disassoc.reason_code */
 634         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 635
 636         if (send_frame) {
 637                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 638                                     DEAUTH_DISASSOC_LEN);
 639                 if (!skb)
 640                         return;
 641
 642                 skb_reserve(skb, local->hw.extra_tx_headroom);
 643
 644                 /* copy in frame */
 645                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 646                        mgmt, DEAUTH_DISASSOC_LEN);
 647
 648                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 649                         IEEE80211_SKB_CB(skb)->flags |=
 650                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 651                 ieee80211_tx_skb(sdata, skb);
 652         }
 653 }
 654
 655 void ieee80211_send_pspoll(struct ieee80211_local *local,
 656                            struct ieee80211_sub_if_data *sdata)
 657 {
 658         struct ieee80211_pspoll *pspoll;
 659         struct sk_buff *skb;
 660
 661         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 662         if (!skb)
 663                 return;
 664
 665         pspoll = (struct ieee80211_pspoll *) skb->data;
 666         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 667
 668         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 669         ieee80211_tx_skb(sdata, skb);
 670 }
 671
 672 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 673                              struct ieee80211_sub_if_data *sdata,
 674                              int powersave)
 675 {
 676         struct sk_buff *skb;
 677         struct ieee80211_hdr_3addr *nullfunc;
 678         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 679
 680         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 681         if (!skb)
 682                 return;
 683
 684         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 685         if (powersave)
 686                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 687
 688         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 689         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 690                             IEEE80211_STA_CONNECTION_POLL))
 691                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 692
 693         ieee80211_tx_skb(sdata, skb);
 694 }
 695
 696 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 697                                           struct ieee80211_sub_if_data *sdata)
 698 {
 699         struct sk_buff *skb;
 700         struct ieee80211_hdr *nullfunc;
 701         __le16 fc;
 702
 703         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 704                 return;
 705
 706         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 707         if (!skb)
 708                 return;
 709
 710         skb_reserve(skb, local->hw.extra_tx_headroom);
 711
 712         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 713         memset(nullfunc, 0, 30);
 714         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 715                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 716         nullfunc->frame_control = fc;
 717         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 718         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 719         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 720         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 721
 722         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 723         ieee80211_tx_skb(sdata, skb);
 724 }
 725
 726 /* spectrum management related things */
 727 static void ieee80211_chswitch_work(struct work_struct *work)
 728 {
 729         struct ieee80211_sub_if_data *sdata =
 730                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 731         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 732
 733         if (!ieee80211_sdata_running(sdata))
 734                 return;
 735
 736         mutex_lock(&ifmgd->mtx);
 737         if (!ifmgd->associated)
 738                 goto out;
 739
 740         sdata->local->oper_channel = sdata->local->csa_channel;
 741         if (!sdata->local->ops->channel_switch) {
 742                 /* call "hw_config" only if doing sw channel switch */
 743                 ieee80211_hw_config(sdata->local,
 744                         IEEE80211_CONF_CHANGE_CHANNEL);
 745         } else {
 746                 /* update the device channel directly */
 747                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 748         }
 749
 750         /* XXX: shouldn't really modify cfg80211-owned data! */
 751         ifmgd->associated->channel = sdata->local->oper_channel;
 752
 753         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 754                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 755  out:
 756         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 757         mutex_unlock(&ifmgd->mtx);
 758 }
 759
 760 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 761 {
 762         struct ieee80211_sub_if_data *sdata;
 763         struct ieee80211_if_managed *ifmgd;
 764
 765         sdata = vif_to_sdata(vif);
 766         ifmgd = &sdata->u.mgd;
 767
 768         trace_api_chswitch_done(sdata, success);
 769         if (!success) {
 770                 /*
 771                  * If the channel switch was not successful, stay
 772                  * around on the old channel. We currently lack
 773                  * good handling of this situation, possibly we
 774                  * should just drop the association.
 775                  */
 776                 sdata->local->csa_channel = sdata->local->oper_channel;
 777         }
 778
 779         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 780 }
 781 EXPORT_SYMBOL(ieee80211_chswitch_done);
 782
 783 static void ieee80211_chswitch_timer(unsigned long data)
 784 {
 785         struct ieee80211_sub_if_data *sdata =
 786                 (struct ieee80211_sub_if_data *) data;
 787         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 788
 789         if (sdata->local->quiescing) {
 790                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 791                 return;
 792         }
 793
 794         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 795 }
 796
 797 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 798                                       struct ieee80211_channel_sw_ie *sw_elem,
 799                                       struct ieee80211_bss *bss,
 800                                       u64 timestamp)
 801 {
 802         struct cfg80211_bss *cbss =
 803                 container_of((void *)bss, struct cfg80211_bss, priv);
 804         struct ieee80211_channel *new_ch;
 805         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 806         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 807                                                       cbss->channel->band);
 808
 809         ASSERT_MGD_MTX(ifmgd);
 810
 811         if (!ifmgd->associated)
 812                 return;
 813
 814         if (sdata->local->scanning)
 815                 return;
 816
 817         /* Disregard subsequent beacons if we are already running a timer
 818            processing a CSA */
 819
 820         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 821                 return;
 822
 823         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 824         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 825                 return;
 826
 827         sdata->local->csa_channel = new_ch;
 828
 829         if (sdata->local->ops->channel_switch) {
 830                 /* use driver's channel switch callback */
 831                 struct ieee80211_channel_switch ch_switch;
 832                 memset(&ch_switch, 0, sizeof(ch_switch));
 833                 ch_switch.timestamp = timestamp;
 834                 if (sw_elem->mode) {
 835                         ch_switch.block_tx = true;
 836                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 837                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 838                 }
 839                 ch_switch.channel = new_ch;
 840                 ch_switch.count = sw_elem->count;
 841                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 842                 drv_channel_switch(sdata->local, &ch_switch);
 843                 return;
 844         }
 845
 846         /* channel switch handled in software */
 847         if (sw_elem->count <= 1) {
 848                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 849         } else {
 850                 if (sw_elem->mode)
 851                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 852                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 853                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 854                 mod_timer(&ifmgd->chswitch_timer,
 855                           jiffies +
 856                           msecs_to_jiffies(sw_elem->count *
 857                                            cbss->beacon_interval));
 858         }
 859 }
 860
 861 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 862                                         u16 capab_info, u8 *pwr_constr_elem,
 863                                         u8 pwr_constr_elem_len)
 864 {
 865         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 866
 867         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 868                 return;
 869
 870         /* Power constraint IE length should be 1 octet */
 871         if (pwr_constr_elem_len != 1)
 872                 return;
 873
 874         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 875             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 876                 sdata->local->power_constr_level = *pwr_constr_elem;
 877                 ieee80211_hw_config(sdata->local, 0);
 878         }
 879 }
 880
 881 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 882 {
 883         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 884         struct ieee80211_local *local = sdata->local;
 885         struct ieee80211_conf *conf = &local->hw.conf;
 886
 887         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 888                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 889                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 890
 891         local->disable_dynamic_ps = false;
 892         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 893 }
 894 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 895
 896 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 897 {
 898         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 899         struct ieee80211_local *local = sdata->local;
 900         struct ieee80211_conf *conf = &local->hw.conf;
 901
 902         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 903                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 904                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 905
 906         local->disable_dynamic_ps = true;
 907         conf->dynamic_ps_timeout = 0;
 908         del_timer_sync(&local->dynamic_ps_timer);
 909         ieee80211_queue_work(&local->hw,
 910                              &local->dynamic_ps_enable_work);
 911 }
 912 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 913
 914 /* powersave */
 915 static void ieee80211_enable_ps(struct ieee80211_local *local,
 916                                 struct ieee80211_sub_if_data *sdata)
 917 {
 918         struct ieee80211_conf *conf = &local->hw.conf;
 919
 920         /*
 921          * If we are scanning right now then the parameters will
 922          * take effect when scan finishes.
 923          */
 924         if (local->scanning)
 925                 return;
 926
 927         if (conf->dynamic_ps_timeout > 0 &&
 928             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 929                 mod_timer(&local->dynamic_ps_timer, jiffies +
 930                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 931         } else {
 932                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 933                         ieee80211_send_nullfunc(local, sdata, 1);
 934
 935                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 936                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 937                         return;
 938
 939                 conf->flags |= IEEE80211_CONF_PS;
 940                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 941         }
 942 }
 943
 944 static void ieee80211_change_ps(struct ieee80211_local *local)
 945 {
 946         struct ieee80211_conf *conf = &local->hw.conf;
 947
 948         if (local->ps_sdata) {
 949                 ieee80211_enable_ps(local, local->ps_sdata);
 950         } else if (conf->flags & IEEE80211_CONF_PS) {
 951                 conf->flags &= ~IEEE80211_CONF_PS;
 952                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 953                 del_timer_sync(&local->dynamic_ps_timer);
 954                 cancel_work_sync(&local->dynamic_ps_enable_work);
 955         }
 956 }
 957
 958 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 959 {
 960         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 961         struct sta_info *sta = NULL;
 962         bool authorized = false;
 963
 964         if (!mgd->powersave)
 965                 return false;
 966
 967         if (mgd->broken_ap)
 968                 return false;
 969
 970         if (!mgd->associated)
 971                 return false;
 972
 973         if (!mgd->associated->beacon_ies)
 974                 return false;
 975
 976         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 977                           IEEE80211_STA_CONNECTION_POLL))
 978                 return false;
 979
 980         rcu_read_lock();
 981         sta = sta_info_get(sdata, mgd->bssid);
 982         if (sta)
 983                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 984         rcu_read_unlock();
 985
 986         return authorized;
 987 }
 988
 989 /* need to hold RTNL or interface lock */
 990 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 991 {
 992         struct ieee80211_sub_if_data *sdata, *found = NULL;
 993         int count = 0;
 994         int timeout;
 995
 996         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 997                 local->ps_sdata = NULL;
 998                 return;
 999         }
1000
1001         if (!list_empty(&local->work_list)) {
1002                 local->ps_sdata = NULL;
1003                 goto change;
1004         }
1005
1006         list_for_each_entry(sdata, &local->interfaces, list) {
1007                 if (!ieee80211_sdata_running(sdata))
1008                         continue;
1009                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1010                         /* If an AP vif is found, then disable PS
1011                          * by setting the count to zero thereby setting
1012                          * ps_sdata to NULL.
1013                          */
1014                         count = 0;
1015                         break;
1016                 }
1017                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1018                         continue;
1019                 found = sdata;
1020                 count++;
1021         }
1022
1023         if (count == 1 && ieee80211_powersave_allowed(found)) {
1024                 struct ieee80211_conf *conf = &local->hw.conf;
1025                 s32 beaconint_us;
1026
1027                 if (latency < 0)
1028                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1029
1030                 beaconint_us = ieee80211_tu_to_usec(
1031                                         found->vif.bss_conf.beacon_int);
1032
1033                 timeout = local->dynamic_ps_forced_timeout;
1034                 if (timeout < 0) {
1035                         /*
1036                          * Go to full PSM if the user configures a very low
1037                          * latency requirement.
1038                          * The 2000 second value is there for compatibility
1039                          * until the PM_QOS_NETWORK_LATENCY is configured
1040                          * with real values.
1041                          */
1042                         if (latency > (1900 * USEC_PER_MSEC) &&
1043                             latency != (2000 * USEC_PER_SEC))
1044                                 timeout = 0;
1045                         else
1046                                 timeout = 100;
1047                 }
1048                 local->dynamic_ps_user_timeout = timeout;
1049                 if (!local->disable_dynamic_ps)
1050                         conf->dynamic_ps_timeout =
1051                                 local->dynamic_ps_user_timeout;
1052
1053                 if (beaconint_us > latency) {
1054                         local->ps_sdata = NULL;
1055                 } else {
1056                         struct ieee80211_bss *bss;
1057                         int maxslp = 1;
1058                         u8 dtimper;
1059
1060                         bss = (void *)found->u.mgd.associated->priv;
1061                         dtimper = bss->dtim_period;
1062
1063                         /* If the TIM IE is invalid, pretend the value is 1 */
1064                         if (!dtimper)
1065                                 dtimper = 1;
1066                         else if (dtimper > 1)
1067                                 maxslp = min_t(int, dtimper,
1068                                                     latency / beaconint_us);
1069
1070                         local->hw.conf.max_sleep_period = maxslp;
1071                         local->hw.conf.ps_dtim_period = dtimper;
1072                         local->ps_sdata = found;
1073                 }
1074         } else {
1075                 local->ps_sdata = NULL;
1076         }
1077
1078  change:
1079         ieee80211_change_ps(local);
1080 }
1081
1082 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1083 {
1084         struct ieee80211_local *local =
1085                 container_of(work, struct ieee80211_local,
1086                              dynamic_ps_disable_work);
1087
1088         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1089                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1090                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1091         }
1092
1093         ieee80211_wake_queues_by_reason(&local->hw,
1094                                         IEEE80211_QUEUE_STOP_REASON_PS);
1095 }
1096
1097 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1098 {
1099         struct ieee80211_local *local =
1100                 container_of(work, struct ieee80211_local,
1101                              dynamic_ps_enable_work);
1102         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1103         struct ieee80211_if_managed *ifmgd;
1104         unsigned long flags;
1105         int q;
1106
1107         /* can only happen when PS was just disabled anyway */
1108         if (!sdata)
1109                 return;
1110
1111         ifmgd = &sdata->u.mgd;
1112
1113         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1114                 return;
1115
1116         if (!local->disable_dynamic_ps &&
1117             local->hw.conf.dynamic_ps_timeout > 0) {
1118                 /* don't enter PS if TX frames are pending */
1119                 if (drv_tx_frames_pending(local)) {
1120                         mod_timer(&local->dynamic_ps_timer, jiffies +
1121                                   msecs_to_jiffies(
1122                                   local->hw.conf.dynamic_ps_timeout));
1123                         return;
1124                 }
1125
1126                 /*
1127                  * transmission can be stopped by others which leads to
1128                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1129                  * is not the actual idle state.
1130                  */
1131                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1132                 for (q = 0; q < local->hw.queues; q++) {
1133                         if (local->queue_stop_reasons[q]) {
1134                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1135                                                        flags);
1136                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1137                                           msecs_to_jiffies(
1138                                           local->hw.conf.dynamic_ps_timeout));
1139                                 return;
1140                         }
1141                 }
1142                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1143         }
1144
1145         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1146             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1147                 netif_tx_stop_all_queues(sdata->dev);
1148
1149                 if (drv_tx_frames_pending(local))
1150                         mod_timer(&local->dynamic_ps_timer, jiffies +
1151                                   msecs_to_jiffies(
1152                                   local->hw.conf.dynamic_ps_timeout));
1153                 else {
1154                         ieee80211_send_nullfunc(local, sdata, 1);
1155                         /* Flush to get the tx status of nullfunc frame */
1156                         drv_flush(local, false);
1157                 }
1158         }
1159
1160         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1161               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1162             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1163                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1164                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1165                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1166         }
1167
1168         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1169                 netif_tx_wake_all_queues(sdata->dev);
1170 }
1171
1172 void ieee80211_dynamic_ps_timer(unsigned long data)
1173 {
1174         struct ieee80211_local *local = (void *) data;
1175
1176         if (local->quiescing || local->suspended)
1177                 return;
1178
1179         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1180 }
1181
1182 /* MLME */
1183 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
1184                                      struct ieee80211_sub_if_data *sdata,
1185                                      u8 *wmm_param, size_t wmm_param_len)
1186 {
1187         struct ieee80211_tx_queue_params params;
1188         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1189         size_t left;
1190         int count;
1191         u8 *pos, uapsd_queues = 0;
1192
1193         if (!local->ops->conf_tx)
1194                 return;
1195
1196         if (local->hw.queues < 4)
1197                 return;
1198
1199         if (!wmm_param)
1200                 return;
1201
1202         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1203                 return;
1204
1205         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1206                 uapsd_queues = local->uapsd_queues;
1207
1208         count = wmm_param[6] & 0x0f;
1209         if (count == ifmgd->wmm_last_param_set)
1210                 return;
1211         ifmgd->wmm_last_param_set = count;
1212
1213         pos = wmm_param + 8;
1214         left = wmm_param_len - 8;
1215
1216         memset(&params, 0, sizeof(params));
1217
1218         local->wmm_acm = 0;
1219         for (; left >= 4; left -= 4, pos += 4) {
1220                 int aci = (pos[0] >> 5) & 0x03;
1221                 int acm = (pos[0] >> 4) & 0x01;
1222                 bool uapsd = false;
1223                 int queue;
1224
1225                 switch (aci) {
1226                 case 1: /* AC_BK */
1227                         queue = 3;
1228                         if (acm)
1229                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1230                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1231                                 uapsd = true;
1232                         break;
1233                 case 2: /* AC_VI */
1234                         queue = 1;
1235                         if (acm)
1236                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1237                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1238                                 uapsd = true;
1239                         break;
1240                 case 3: /* AC_VO */
1241                         queue = 0;
1242                         if (acm)
1243                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1244                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1245                                 uapsd = true;
1246                         break;
1247                 case 0: /* AC_BE */
1248                 default:
1249                         queue = 2;
1250                         if (acm)
1251                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1252                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1253                                 uapsd = true;
1254                         break;
1255                 }
1256
1257                 params.aifs = pos[0] & 0x0f;
1258                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1259                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1260                 params.txop = get_unaligned_le16(pos + 2);
1261                 params.uapsd = uapsd;
1262
1263 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1264                 wiphy_debug(local->hw.wiphy,
1265                             "WMM queue=%d aci=%d acm=%d aifs=%d "
1266                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1267                             queue, aci, acm,
1268                             params.aifs, params.cw_min, params.cw_max,
1269                             params.txop, params.uapsd);
1270 #endif
1271                 sdata->tx_conf[queue] = params;
1272                 if (drv_conf_tx(local, sdata, queue, &params))
1273                         wiphy_debug(local->hw.wiphy,
1274                                     "failed to set TX queue parameters for queue %d\n",
1275                                     queue);
1276         }
1277
1278         /* enable WMM or activate new settings */
1279         sdata->vif.bss_conf.qos = true;
1280 }
1281
1282 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1283                                            u16 capab, bool erp_valid, u8 erp)
1284 {
1285         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1286         u32 changed = 0;
1287         bool use_protection;
1288         bool use_short_preamble;
1289         bool use_short_slot;
1290
1291         if (erp_valid) {
1292                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1293                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1294         } else {
1295                 use_protection = false;
1296                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1297         }
1298
1299         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1300         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1301                 use_short_slot = true;
1302
1303         if (use_protection != bss_conf->use_cts_prot) {
1304                 bss_conf->use_cts_prot = use_protection;
1305                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1306         }
1307
1308         if (use_short_preamble != bss_conf->use_short_preamble) {
1309                 bss_conf->use_short_preamble = use_short_preamble;
1310                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1311         }
1312
1313         if (use_short_slot != bss_conf->use_short_slot) {
1314                 bss_conf->use_short_slot = use_short_slot;
1315                 changed |= BSS_CHANGED_ERP_SLOT;
1316         }
1317
1318         return changed;
1319 }
1320
1321 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1322                                      struct cfg80211_bss *cbss,
1323                                      u32 bss_info_changed)
1324 {
1325         struct ieee80211_bss *bss = (void *)cbss->priv;
1326         struct ieee80211_local *local = sdata->local;
1327         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1328
1329         bss_info_changed |= BSS_CHANGED_ASSOC;
1330         /* set timing information */
1331         bss_conf->beacon_int = cbss->beacon_interval;
1332         bss_conf->timestamp = cbss->tsf;
1333
1334         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1335         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1336                 cbss->capability, bss->has_erp_value, bss->erp_value);
1337
1338         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1339                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1340
1341         sdata->u.mgd.associated = cbss;
1342         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1343
1344         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1345
1346         /* just to be sure */
1347         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1348                                 IEEE80211_STA_BEACON_POLL);
1349
1350         ieee80211_led_assoc(local, 1);
1351
1352         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1353                 bss_conf->dtim_period = bss->dtim_period;
1354         else
1355                 bss_conf->dtim_period = 0;
1356
1357         bss_conf->assoc = 1;
1358         /*
1359          * For now just always ask the driver to update the basic rateset
1360          * when we have associated, we aren't checking whether it actually
1361          * changed or not.
1362          */
1363         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1364
1365         /* And the BSSID changed - we're associated now */
1366         bss_info_changed |= BSS_CHANGED_BSSID;
1367
1368         /* Tell the driver to monitor connection quality (if supported) */
1369         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1370             bss_conf->cqm_rssi_thold)
1371                 bss_info_changed |= BSS_CHANGED_CQM;
1372
1373         /* Enable ARP filtering */
1374         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1375                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1376                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1377         }
1378
1379         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1380
1381         mutex_lock(&local->iflist_mtx);
1382         ieee80211_recalc_ps(local, -1);
1383         ieee80211_recalc_smps(local);
1384         mutex_unlock(&local->iflist_mtx);
1385
1386         netif_tx_start_all_queues(sdata->dev);
1387         netif_carrier_on(sdata->dev);
1388 }
1389
1390 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1391                                    u16 stype, u16 reason, bool tx,
1392                                    u8 *frame_buf)
1393 {
1394         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1395         struct ieee80211_local *local = sdata->local;
1396         struct sta_info *sta;
1397         u32 changed = 0, config_changed = 0;
1398         u8 bssid[ETH_ALEN];
1399
1400         ASSERT_MGD_MTX(ifmgd);
1401
1402         if (WARN_ON_ONCE(tx && !frame_buf))
1403                 return;
1404
1405         if (WARN_ON(!ifmgd->associated))
1406                 return;
1407
1408         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1409
1410         ifmgd->associated = NULL;
1411         memset(ifmgd->bssid, 0, ETH_ALEN);
1412
1413         /*
1414          * we need to commit the associated = NULL change because the
1415          * scan code uses that to determine whether this iface should
1416          * go to/wake up from powersave or not -- and could otherwise
1417          * wake the queues erroneously.
1418          */
1419         smp_mb();
1420
1421         /*
1422          * Thus, we can only afterwards stop the queues -- to account
1423          * for the case where another CPU is finishing a scan at this
1424          * time -- we don't want the scan code to enable queues.
1425          */
1426
1427         netif_tx_stop_all_queues(sdata->dev);
1428         netif_carrier_off(sdata->dev);
1429
1430         mutex_lock(&local->sta_mtx);
1431         sta = sta_info_get(sdata, bssid);
1432         if (sta) {
1433                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1434                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1435         }
1436         mutex_unlock(&local->sta_mtx);
1437
1438         /* deauthenticate/disassociate now */
1439         if (tx || frame_buf)
1440                 ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason,
1441                                                tx, frame_buf);
1442
1443         /* flush out frame */
1444         if (tx)
1445                 drv_flush(local, false);
1446
1447         /* remove AP and TDLS peers */
1448         sta_info_flush(local, sdata);
1449
1450         /* finally reset all BSS / config parameters */
1451         changed |= ieee80211_reset_erp_info(sdata);
1452
1453         ieee80211_led_assoc(local, 0);
1454         changed |= BSS_CHANGED_ASSOC;
1455         sdata->vif.bss_conf.assoc = false;
1456
1457         /* channel(_type) changes are handled by ieee80211_hw_config */
1458         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1459
1460         /* on the next assoc, re-program HT parameters */
1461         sdata->ht_opmode_valid = false;
1462         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1463         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1464
1465         local->power_constr_level = 0;
1466
1467         del_timer_sync(&local->dynamic_ps_timer);
1468         cancel_work_sync(&local->dynamic_ps_enable_work);
1469
1470         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1471                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1472                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1473         }
1474         local->ps_sdata = NULL;
1475
1476         ieee80211_hw_config(local, config_changed);
1477
1478         /* Disable ARP filtering */
1479         if (sdata->vif.bss_conf.arp_filter_enabled) {
1480                 sdata->vif.bss_conf.arp_filter_enabled = false;
1481                 changed |= BSS_CHANGED_ARP_FILTER;
1482         }
1483
1484         sdata->vif.bss_conf.qos = false;
1485         changed |= BSS_CHANGED_QOS;
1486
1487         /* The BSSID (not really interesting) and HT changed */
1488         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1489         ieee80211_bss_info_change_notify(sdata, changed);
1490
1491         /* disassociated - set to defaults now */
1492         ieee80211_set_wmm_default(sdata, false);
1493
1494         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1495         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1496         del_timer_sync(&sdata->u.mgd.timer);
1497         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1498 }
1499
1500 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1501                              struct ieee80211_hdr *hdr)
1502 {
1503         /*
1504          * We can postpone the mgd.timer whenever receiving unicast frames
1505          * from AP because we know that the connection is working both ways
1506          * at that time. But multicast frames (and hence also beacons) must
1507          * be ignored here, because we need to trigger the timer during
1508          * data idle periods for sending the periodic probe request to the
1509          * AP we're connected to.
1510          */
1511         if (is_multicast_ether_addr(hdr->addr1))
1512                 return;
1513
1514         ieee80211_sta_reset_conn_monitor(sdata);
1515 }
1516
1517 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1518 {
1519         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1520
1521         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1522                               IEEE80211_STA_CONNECTION_POLL)))
1523             return;
1524
1525         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1526                           IEEE80211_STA_BEACON_POLL);
1527         mutex_lock(&sdata->local->iflist_mtx);
1528         ieee80211_recalc_ps(sdata->local, -1);
1529         mutex_unlock(&sdata->local->iflist_mtx);
1530
1531         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1532                 return;
1533
1534         /*
1535          * We've received a probe response, but are not sure whether
1536          * we have or will be receiving any beacons or data, so let's
1537          * schedule the timers again, just in case.
1538          */
1539         ieee80211_sta_reset_beacon_monitor(sdata);
1540
1541         mod_timer(&ifmgd->conn_mon_timer,
1542                   round_jiffies_up(jiffies +
1543                                    IEEE80211_CONNECTION_IDLE_TIME));
1544 }
1545
1546 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1547                              struct ieee80211_hdr *hdr, bool ack)
1548 {
1549         if (!ieee80211_is_data(hdr->frame_control))
1550             return;
1551
1552         if (ack)
1553                 ieee80211_sta_reset_conn_monitor(sdata);
1554
1555         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1556             sdata->u.mgd.probe_send_count > 0) {
1557                 if (ack)
1558                         sdata->u.mgd.probe_send_count = 0;
1559                 else
1560                         sdata->u.mgd.nullfunc_failed = true;
1561                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1562         }
1563 }
1564
1565 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1566 {
1567         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1568         const u8 *ssid;
1569         u8 *dst = ifmgd->associated->bssid;
1570         u8 unicast_limit = max(1, max_probe_tries - 3);
1571
1572         /*
1573          * Try sending broadcast probe requests for the last three
1574          * probe requests after the first ones failed since some
1575          * buggy APs only support broadcast probe requests.
1576          */
1577         if (ifmgd->probe_send_count >= unicast_limit)
1578                 dst = NULL;
1579
1580         /*
1581          * When the hardware reports an accurate Tx ACK status, it's
1582          * better to send a nullfunc frame instead of a probe request,
1583          * as it will kick us off the AP quickly if we aren't associated
1584          * anymore. The timeout will be reset if the frame is ACKed by
1585          * the AP.
1586          */
1587         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1588                 ifmgd->nullfunc_failed = false;
1589                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1590         } else {
1591                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1592                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1593                                          (u32) -1, true, false);
1594         }
1595
1596         ifmgd->probe_send_count++;
1597         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1598         run_again(ifmgd, ifmgd->probe_timeout);
1599 }
1600
1601 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1602                                    bool beacon)
1603 {
1604         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1605         bool already = false;
1606
1607         if (!ieee80211_sdata_running(sdata))
1608                 return;
1609
1610         if (sdata->local->scanning)
1611                 return;
1612
1613         if (sdata->local->tmp_channel)
1614                 return;
1615
1616         mutex_lock(&ifmgd->mtx);
1617
1618         if (!ifmgd->associated)
1619                 goto out;
1620
1621 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1622         if (beacon && net_ratelimit())
1623                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1624                        "- sending probe request\n", sdata->name);
1625 #endif
1626
1627         /*
1628          * The driver/our work has already reported this event or the
1629          * connection monitoring has kicked in and we have already sent
1630          * a probe request. Or maybe the AP died and the driver keeps
1631          * reporting until we disassociate...
1632          *
1633          * In either case we have to ignore the current call to this
1634          * function (except for setting the correct probe reason bit)
1635          * because otherwise we would reset the timer every time and
1636          * never check whether we received a probe response!
1637          */
1638         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1639                             IEEE80211_STA_CONNECTION_POLL))
1640                 already = true;
1641
1642         if (beacon)
1643                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1644         else
1645                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1646
1647         if (already)
1648                 goto out;
1649
1650         mutex_lock(&sdata->local->iflist_mtx);
1651         ieee80211_recalc_ps(sdata->local, -1);
1652         mutex_unlock(&sdata->local->iflist_mtx);
1653
1654         ifmgd->probe_send_count = 0;
1655         ieee80211_mgd_probe_ap_send(sdata);
1656  out:
1657         mutex_unlock(&ifmgd->mtx);
1658 }
1659
1660 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1661                                           struct ieee80211_vif *vif)
1662 {
1663         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1664         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1665         struct sk_buff *skb;
1666         const u8 *ssid;
1667
1668         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1669                 return NULL;
1670
1671         ASSERT_MGD_MTX(ifmgd);
1672
1673         if (!ifmgd->associated)
1674                 return NULL;
1675
1676         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1677         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1678                                         (u32) -1, ssid + 2, ssid[1],
1679                                         NULL, 0, true);
1680
1681         return skb;
1682 }
1683 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1684
1685 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1686 {
1687         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1688         struct ieee80211_local *local = sdata->local;
1689         u8 bssid[ETH_ALEN];
1690         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1691
1692         mutex_lock(&ifmgd->mtx);
1693         if (!ifmgd->associated) {
1694                 mutex_unlock(&ifmgd->mtx);
1695                 return;
1696         }
1697
1698         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1699
1700         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1701                sdata->name, bssid);
1702
1703         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1704                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1705                                false, frame_buf);
1706         mutex_unlock(&ifmgd->mtx);
1707
1708         /*
1709          * must be outside lock due to cfg80211,
1710          * but that's not a problem.
1711          */
1712         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1713
1714         mutex_lock(&local->mtx);
1715         ieee80211_recalc_idle(local);
1716         mutex_unlock(&local->mtx);
1717 }
1718
1719 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1720 {
1721         struct ieee80211_sub_if_data *sdata =
1722                 container_of(work, struct ieee80211_sub_if_data,
1723                              u.mgd.beacon_connection_loss_work);
1724         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1725         struct sta_info *sta;
1726
1727         if (ifmgd->associated) {
1728                 rcu_read_lock();
1729                 sta = sta_info_get(sdata, ifmgd->bssid);
1730                 if (sta)
1731                         sta->beacon_loss_count++;
1732                 rcu_read_unlock();
1733         }
1734
1735         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1736                 __ieee80211_connection_loss(sdata);
1737         else
1738                 ieee80211_mgd_probe_ap(sdata, true);
1739 }
1740
1741 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1742 {
1743         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1744         struct ieee80211_hw *hw = &sdata->local->hw;
1745
1746         trace_api_beacon_loss(sdata);
1747
1748         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1749         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1750 }
1751 EXPORT_SYMBOL(ieee80211_beacon_loss);
1752
1753 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1754 {
1755         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1756         struct ieee80211_hw *hw = &sdata->local->hw;
1757
1758         trace_api_connection_loss(sdata);
1759
1760         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1761         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1762 }
1763 EXPORT_SYMBOL(ieee80211_connection_loss);
1764
1765
1766 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1767                                         bool assoc)
1768 {
1769         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1770
1771         lockdep_assert_held(&sdata->u.mgd.mtx);
1772
1773         if (auth_data->synced)
1774                 drv_finish_tx_sync(sdata->local, sdata,
1775                                    auth_data->bss->bssid,
1776                                    IEEE80211_TX_SYNC_AUTH);
1777
1778         if (!assoc) {
1779                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1780
1781                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1782                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1783         }
1784
1785         cfg80211_put_bss(auth_data->bss);
1786         kfree(auth_data);
1787         sdata->u.mgd.auth_data = NULL;
1788 }
1789
1790 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1791                                      struct ieee80211_mgmt *mgmt, size_t len)
1792 {
1793         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1794         u8 *pos;
1795         struct ieee802_11_elems elems;
1796
1797         pos = mgmt->u.auth.variable;
1798         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1799         if (!elems.challenge)
1800                 return;
1801         auth_data->expected_transaction = 4;
1802         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1803                             elems.challenge - 2, elems.challenge_len + 2,
1804                             auth_data->bss->bssid, auth_data->bss->bssid,
1805                             auth_data->key, auth_data->key_len,
1806                             auth_data->key_idx);
1807 }
1808
1809 static enum rx_mgmt_action __must_check
1810 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1811                        struct ieee80211_mgmt *mgmt, size_t len)
1812 {
1813         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1814         u8 bssid[ETH_ALEN];
1815         u16 auth_alg, auth_transaction, status_code;
1816         struct sta_info *sta;
1817
1818         lockdep_assert_held(&ifmgd->mtx);
1819
1820         if (len < 24 + 6)
1821                 return RX_MGMT_NONE;
1822
1823         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1824                 return RX_MGMT_NONE;
1825
1826         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1827
1828         if (compare_ether_addr(bssid, mgmt->bssid))
1829                 return RX_MGMT_NONE;
1830
1831         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1832         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1833         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1834
1835         if (auth_alg != ifmgd->auth_data->algorithm ||
1836             auth_transaction != ifmgd->auth_data->expected_transaction)
1837                 return RX_MGMT_NONE;
1838
1839         if (status_code != WLAN_STATUS_SUCCESS) {
1840                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
1841                        sdata->name, mgmt->sa, status_code);
1842                 goto out;
1843         }
1844
1845         switch (ifmgd->auth_data->algorithm) {
1846         case WLAN_AUTH_OPEN:
1847         case WLAN_AUTH_LEAP:
1848         case WLAN_AUTH_FT:
1849                 break;
1850         case WLAN_AUTH_SHARED_KEY:
1851                 if (ifmgd->auth_data->expected_transaction != 4) {
1852                         ieee80211_auth_challenge(sdata, mgmt, len);
1853                         /* need another frame */
1854                         return RX_MGMT_NONE;
1855                 }
1856                 break;
1857         default:
1858                 WARN_ONCE(1, "invalid auth alg %d",
1859                           ifmgd->auth_data->algorithm);
1860                 return RX_MGMT_NONE;
1861         }
1862
1863         printk(KERN_DEBUG "%s: authenticated\n", sdata->name);
1864  out:
1865         if (ifmgd->auth_data->synced)
1866                 drv_finish_tx_sync(sdata->local, sdata, bssid,
1867                                    IEEE80211_TX_SYNC_AUTH);
1868         ifmgd->auth_data->synced = false;
1869         ifmgd->auth_data->done = true;
1870         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1871         run_again(ifmgd, ifmgd->auth_data->timeout);
1872
1873         /* move station state to auth */
1874         mutex_lock(&sdata->local->sta_mtx);
1875         sta = sta_info_get(sdata, bssid);
1876         if (!sta) {
1877                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1878                 goto out_err;
1879         }
1880         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1881                 printk(KERN_DEBUG "%s: failed moving %pM to auth\n",
1882                        sdata->name, bssid);
1883                 goto out_err;
1884         }
1885         mutex_unlock(&sdata->local->sta_mtx);
1886
1887         return RX_MGMT_CFG80211_RX_AUTH;
1888  out_err:
1889         mutex_unlock(&sdata->local->sta_mtx);
1890         /* ignore frame -- wait for timeout */
1891         return RX_MGMT_NONE;
1892 }
1893
1894
1895 static enum rx_mgmt_action __must_check
1896 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1897                          struct ieee80211_mgmt *mgmt, size_t len)
1898 {
1899         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1900         const u8 *bssid = NULL;
1901         u16 reason_code;
1902
1903         lockdep_assert_held(&ifmgd->mtx);
1904
1905         if (len < 24 + 2)
1906                 return RX_MGMT_NONE;
1907
1908         if (!ifmgd->associated ||
1909             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1910                 return RX_MGMT_NONE;
1911
1912         bssid = ifmgd->associated->bssid;
1913
1914         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1915
1916         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1917                         sdata->name, bssid, reason_code);
1918
1919         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1920
1921         mutex_lock(&sdata->local->mtx);
1922         ieee80211_recalc_idle(sdata->local);
1923         mutex_unlock(&sdata->local->mtx);
1924
1925         return RX_MGMT_CFG80211_DEAUTH;
1926 }
1927
1928
1929 static enum rx_mgmt_action __must_check
1930 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1931                            struct ieee80211_mgmt *mgmt, size_t len)
1932 {
1933         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1934         u16 reason_code;
1935
1936         lockdep_assert_held(&ifmgd->mtx);
1937
1938         if (len < 24 + 2)
1939                 return RX_MGMT_NONE;
1940
1941         if (!ifmgd->associated ||
1942             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1943                 return RX_MGMT_NONE;
1944
1945         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1946
1947         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1948                         sdata->name, mgmt->sa, reason_code);
1949
1950         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1951
1952         mutex_lock(&sdata->local->mtx);
1953         ieee80211_recalc_idle(sdata->local);
1954         mutex_unlock(&sdata->local->mtx);
1955
1956         return RX_MGMT_CFG80211_DISASSOC;
1957 }
1958
1959 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1960                                 u8 *supp_rates, unsigned int supp_rates_len,
1961                                 u32 *rates, u32 *basic_rates,
1962                                 bool *have_higher_than_11mbit,
1963                                 int *min_rate, int *min_rate_index)
1964 {
1965         int i, j;
1966
1967         for (i = 0; i < supp_rates_len; i++) {
1968                 int rate = (supp_rates[i] & 0x7f) * 5;
1969                 bool is_basic = !!(supp_rates[i] & 0x80);
1970
1971                 if (rate > 110)
1972                         *have_higher_than_11mbit = true;
1973
1974                 /*
1975                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1976                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1977                  *
1978                  * Note: Even through the membership selector and the basic
1979                  *       rate flag share the same bit, they are not exactly
1980                  *       the same.
1981                  */
1982                 if (!!(supp_rates[i] & 0x80) &&
1983                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1984                         continue;
1985
1986                 for (j = 0; j < sband->n_bitrates; j++) {
1987                         if (sband->bitrates[j].bitrate == rate) {
1988                                 *rates |= BIT(j);
1989                                 if (is_basic)
1990                                         *basic_rates |= BIT(j);
1991                                 if (rate < *min_rate) {
1992                                         *min_rate = rate;
1993                                         *min_rate_index = j;
1994                                 }
1995                                 break;
1996                         }
1997                 }
1998         }
1999 }
2000
2001 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2002                                          bool assoc)
2003 {
2004         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2005
2006         lockdep_assert_held(&sdata->u.mgd.mtx);
2007
2008         if (assoc_data->synced)
2009                 drv_finish_tx_sync(sdata->local, sdata,
2010                                    assoc_data->bss->bssid,
2011                                    IEEE80211_TX_SYNC_ASSOC);
2012
2013         if (!assoc) {
2014                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2015
2016                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2017                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2018         }
2019
2020         kfree(assoc_data);
2021         sdata->u.mgd.assoc_data = NULL;
2022 }
2023
2024 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2025                                     struct cfg80211_bss *cbss,
2026                                     struct ieee80211_mgmt *mgmt, size_t len)
2027 {
2028         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2029         struct ieee80211_local *local = sdata->local;
2030         struct ieee80211_supported_band *sband;
2031         struct sta_info *sta;
2032         u8 *pos;
2033         u32 rates, basic_rates;
2034         u16 capab_info, aid;
2035         struct ieee802_11_elems elems;
2036         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2037         u32 changed = 0;
2038         int err;
2039         bool have_higher_than_11mbit = false;
2040         u16 ap_ht_cap_flags;
2041         int min_rate = INT_MAX, min_rate_index = -1;
2042
2043         /* AssocResp and ReassocResp have identical structure */
2044
2045         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2046         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2047
2048         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2049                 printk(KERN_DEBUG
2050                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
2051                        sdata->name, aid);
2052         aid &= ~(BIT(15) | BIT(14));
2053
2054         ifmgd->broken_ap = false;
2055
2056         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2057                 printk(KERN_DEBUG
2058                        "%s: invalid AID value %d (out of range), turn off PS\n",
2059                        sdata->name, aid);
2060                 aid = 0;
2061                 ifmgd->broken_ap = true;
2062         }
2063
2064         pos = mgmt->u.assoc_resp.variable;
2065         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2066
2067         if (!elems.supp_rates) {
2068                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2069                        sdata->name);
2070                 return false;
2071         }
2072
2073         ifmgd->aid = aid;
2074
2075         mutex_lock(&sdata->local->sta_mtx);
2076         /*
2077          * station info was already allocated and inserted before
2078          * the association and should be available to us
2079          */
2080         sta = sta_info_get(sdata, cbss->bssid);
2081         if (WARN_ON(!sta)) {
2082                 mutex_unlock(&sdata->local->sta_mtx);
2083                 return false;
2084         }
2085
2086         rates = 0;
2087         basic_rates = 0;
2088         sband = local->hw.wiphy->bands[local->oper_channel->band];
2089
2090         ieee80211_get_rates(sband, elems.supp_rates, elems.supp_rates_len,
2091                             &rates, &basic_rates, &have_higher_than_11mbit,
2092                             &min_rate, &min_rate_index);
2093
2094         ieee80211_get_rates(sband, elems.ext_supp_rates,
2095                             elems.ext_supp_rates_len, &rates, &basic_rates,
2096                             &have_higher_than_11mbit,
2097                             &min_rate, &min_rate_index);
2098
2099         /*
2100          * some buggy APs don't advertise basic_rates. use the lowest
2101          * supported rate instead.
2102          */
2103         if (unlikely(!basic_rates) && min_rate_index >= 0) {
2104                 printk(KERN_DEBUG "%s: No basic rates in AssocResp. "
2105                        "Using min supported rate instead.\n", sdata->name);
2106                 basic_rates = BIT(min_rate_index);
2107         }
2108
2109         sta->sta.supp_rates[local->oper_channel->band] = rates;
2110         sdata->vif.bss_conf.basic_rates = basic_rates;
2111
2112         /* cf. IEEE 802.11 9.2.12 */
2113         if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
2114             have_higher_than_11mbit)
2115                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2116         else
2117                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2118
2119         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2120                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2121                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2122
2123         ap_ht_cap_flags = sta->sta.ht_cap.cap;
2124
2125         rate_control_rate_init(sta);
2126
2127         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2128                 set_sta_flag(sta, WLAN_STA_MFP);
2129
2130         if (elems.wmm_param)
2131                 set_sta_flag(sta, WLAN_STA_WME);
2132
2133         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2134         if (!err)
2135                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2136         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2137                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2138         if (err) {
2139                 printk(KERN_DEBUG
2140                        "%s: failed to move station %pM to desired state\n",
2141                        sdata->name, sta->sta.addr);
2142                 WARN_ON(__sta_info_destroy(sta));
2143                 mutex_unlock(&sdata->local->sta_mtx);
2144                 return false;
2145         }
2146
2147         mutex_unlock(&sdata->local->sta_mtx);
2148
2149         /*
2150          * Always handle WMM once after association regardless
2151          * of the first value the AP uses. Setting -1 here has
2152          * that effect because the AP values is an unsigned
2153          * 4-bit value.
2154          */
2155         ifmgd->wmm_last_param_set = -1;
2156
2157         if (elems.wmm_param)
2158                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2159                                          elems.wmm_param_len);
2160         else
2161                 ieee80211_set_wmm_default(sdata, false);
2162         changed |= BSS_CHANGED_QOS;
2163
2164         if (elems.ht_info_elem && elems.wmm_param &&
2165             (sdata->local->hw.queues >= 4) &&
2166             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2167                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2168                                                cbss->bssid, ap_ht_cap_flags,
2169                                                false);
2170
2171         /* set AID and assoc capability,
2172          * ieee80211_set_associated() will tell the driver */
2173         bss_conf->aid = aid;
2174         bss_conf->assoc_capability = capab_info;
2175         ieee80211_set_associated(sdata, cbss, changed);
2176
2177         /*
2178          * If we're using 4-addr mode, let the AP know that we're
2179          * doing so, so that it can create the STA VLAN on its side
2180          */
2181         if (ifmgd->use_4addr)
2182                 ieee80211_send_4addr_nullfunc(local, sdata);
2183
2184         /*
2185          * Start timer to probe the connection to the AP now.
2186          * Also start the timer that will detect beacon loss.
2187          */
2188         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2189         ieee80211_sta_reset_beacon_monitor(sdata);
2190
2191         return true;
2192 }
2193
2194 static enum rx_mgmt_action __must_check
2195 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2196                              struct ieee80211_mgmt *mgmt, size_t len,
2197                              struct cfg80211_bss **bss)
2198 {
2199         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2200         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2201         u16 capab_info, status_code, aid;
2202         struct ieee802_11_elems elems;
2203         u8 *pos;
2204         bool reassoc;
2205
2206         lockdep_assert_held(&ifmgd->mtx);
2207
2208         if (!assoc_data)
2209                 return RX_MGMT_NONE;
2210         if (compare_ether_addr(assoc_data->bss->bssid, mgmt->bssid))
2211                 return RX_MGMT_NONE;
2212
2213         /*
2214          * AssocResp and ReassocResp have identical structure, so process both
2215          * of them in this function.
2216          */
2217
2218         if (len < 24 + 6)
2219                 return RX_MGMT_NONE;
2220
2221         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2222         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2223         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2224         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2225
2226         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
2227                "status=%d aid=%d)\n",
2228                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
2229                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2230
2231         pos = mgmt->u.assoc_resp.variable;
2232         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2233
2234         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2235             elems.timeout_int && elems.timeout_int_len == 5 &&
2236             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2237                 u32 tu, ms;
2238                 tu = get_unaligned_le32(elems.timeout_int + 1);
2239                 ms = tu * 1024 / 1000;
2240                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
2241                        "comeback duration %u TU (%u ms)\n",
2242                        sdata->name, mgmt->sa, tu, ms);
2243                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2244                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2245                         run_again(ifmgd, assoc_data->timeout);
2246                 return RX_MGMT_NONE;
2247         }
2248
2249         *bss = assoc_data->bss;
2250
2251         if (status_code != WLAN_STATUS_SUCCESS) {
2252                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
2253                        sdata->name, mgmt->sa, status_code);
2254                 ieee80211_destroy_assoc_data(sdata, false);
2255         } else {
2256                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
2257
2258                 /* tell driver about sync done first */
2259                 if (assoc_data->synced) {
2260                         drv_finish_tx_sync(sdata->local, sdata,
2261                                            assoc_data->bss->bssid,
2262                                            IEEE80211_TX_SYNC_ASSOC);
2263                         assoc_data->synced = false;
2264                 }
2265
2266                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2267                         /* oops -- internal error -- send timeout for now */
2268                         ieee80211_destroy_assoc_data(sdata, true);
2269                         sta_info_destroy_addr(sdata, mgmt->bssid);
2270                         cfg80211_put_bss(*bss);
2271                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2272                 }
2273
2274                 /*
2275                  * destroy assoc_data afterwards, as otherwise an idle
2276                  * recalc after assoc_data is NULL but before associated
2277                  * is set can cause the interface to go idle
2278                  */
2279                 ieee80211_destroy_assoc_data(sdata, true);
2280         }
2281
2282         return RX_MGMT_CFG80211_RX_ASSOC;
2283 }
2284 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2285                                   struct ieee80211_mgmt *mgmt,
2286                                   size_t len,
2287                                   struct ieee80211_rx_status *rx_status,
2288                                   struct ieee802_11_elems *elems,
2289                                   bool beacon)
2290 {
2291         struct ieee80211_local *local = sdata->local;
2292         int freq;
2293         struct ieee80211_bss *bss;
2294         struct ieee80211_channel *channel;
2295         bool need_ps = false;
2296
2297         if (sdata->u.mgd.associated &&
2298             compare_ether_addr(mgmt->bssid, sdata->u.mgd.associated->bssid)
2299             == 0) {
2300                 bss = (void *)sdata->u.mgd.associated->priv;
2301                 /* not previously set so we may need to recalc */
2302                 need_ps = !bss->dtim_period;
2303         }
2304
2305         if (elems->ds_params && elems->ds_params_len == 1)
2306                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2307                                                       rx_status->band);
2308         else
2309                 freq = rx_status->freq;
2310
2311         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2312
2313         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2314                 return;
2315
2316         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2317                                         channel, beacon);
2318         if (bss)
2319                 ieee80211_rx_bss_put(local, bss);
2320
2321         if (!sdata->u.mgd.associated)
2322                 return;
2323
2324         if (need_ps) {
2325                 mutex_lock(&local->iflist_mtx);
2326                 ieee80211_recalc_ps(local, -1);
2327                 mutex_unlock(&local->iflist_mtx);
2328         }
2329
2330         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2331             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2332                                                         ETH_ALEN) == 0)) {
2333                 struct ieee80211_channel_sw_ie *sw_elem =
2334                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2335                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2336                                                  bss, rx_status->mactime);
2337         }
2338 }
2339
2340
2341 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2342                                          struct sk_buff *skb)
2343 {
2344         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2345         struct ieee80211_if_managed *ifmgd;
2346         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2347         size_t baselen, len = skb->len;
2348         struct ieee802_11_elems elems;
2349
2350         ifmgd = &sdata->u.mgd;
2351
2352         ASSERT_MGD_MTX(ifmgd);
2353
2354         if (compare_ether_addr(mgmt->da, sdata->vif.addr))
2355                 return; /* ignore ProbeResp to foreign address */
2356
2357         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2358         if (baselen > len)
2359                 return;
2360
2361         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2362                                 &elems);
2363
2364         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2365
2366         if (ifmgd->associated &&
2367             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid) == 0)
2368                 ieee80211_reset_ap_probe(sdata);
2369
2370         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2371             compare_ether_addr(mgmt->bssid, ifmgd->auth_data->bss->bssid)
2372             == 0) {
2373                 /* got probe response, continue with auth */
2374                 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
2375                 ifmgd->auth_data->tries = 0;
2376                 ifmgd->auth_data->timeout = jiffies;
2377                 run_again(ifmgd, ifmgd->auth_data->timeout);
2378         }
2379 }
2380
2381 /*
2382  * This is the canonical list of information elements we care about,
2383  * the filter code also gives us all changes to the Microsoft OUI
2384  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2385  *
2386  * We implement beacon filtering in software since that means we can
2387  * avoid processing the frame here and in cfg80211, and userspace
2388  * will not be able to tell whether the hardware supports it or not.
2389  *
2390  * XXX: This list needs to be dynamic -- userspace needs to be able to
2391  *      add items it requires. It also needs to be able to tell us to
2392  *      look out for other vendor IEs.
2393  */
2394 static const u64 care_about_ies =
2395         (1ULL << WLAN_EID_COUNTRY) |
2396         (1ULL << WLAN_EID_ERP_INFO) |
2397         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2398         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2399         (1ULL << WLAN_EID_HT_CAPABILITY) |
2400         (1ULL << WLAN_EID_HT_INFORMATION);
2401
2402 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2403                                      struct ieee80211_mgmt *mgmt,
2404                                      size_t len,
2405                                      struct ieee80211_rx_status *rx_status)
2406 {
2407         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2408         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2409         size_t baselen;
2410         struct ieee802_11_elems elems;
2411         struct ieee80211_local *local = sdata->local;
2412         u32 changed = 0;
2413         bool erp_valid, directed_tim = false;
2414         u8 erp_value = 0;
2415         u32 ncrc;
2416         u8 *bssid;
2417
2418         lockdep_assert_held(&ifmgd->mtx);
2419
2420         /* Process beacon from the current BSS */
2421         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2422         if (baselen > len)
2423                 return;
2424
2425         if (rx_status->freq != local->hw.conf.channel->center_freq)
2426                 return;
2427
2428         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2429             compare_ether_addr(mgmt->bssid, ifmgd->assoc_data->bss->bssid)
2430             == 0) {
2431                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2432                                        len - baselen, &elems);
2433
2434                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2435                                       false);
2436                 ifmgd->assoc_data->have_beacon = true;
2437                 ifmgd->assoc_data->sent_assoc = false;
2438                 /* continue assoc process */
2439                 ifmgd->assoc_data->timeout = jiffies;
2440                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2441                 return;
2442         }
2443
2444         if (!ifmgd->associated ||
2445             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
2446                 return;
2447         bssid = ifmgd->associated->bssid;
2448
2449         /* Track average RSSI from the Beacon frames of the current AP */
2450         ifmgd->last_beacon_signal = rx_status->signal;
2451         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2452                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2453                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2454                 ifmgd->last_cqm_event_signal = 0;
2455                 ifmgd->count_beacon_signal = 1;
2456                 ifmgd->last_ave_beacon_signal = 0;
2457         } else {
2458                 ifmgd->ave_beacon_signal =
2459                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2460                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2461                          ifmgd->ave_beacon_signal) / 16;
2462                 ifmgd->count_beacon_signal++;
2463         }
2464
2465         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2466             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2467                 int sig = ifmgd->ave_beacon_signal;
2468                 int last_sig = ifmgd->last_ave_beacon_signal;
2469
2470                 /*
2471                  * if signal crosses either of the boundaries, invoke callback
2472                  * with appropriate parameters
2473                  */
2474                 if (sig > ifmgd->rssi_max_thold &&
2475                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2476                         ifmgd->last_ave_beacon_signal = sig;
2477                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2478                 } else if (sig < ifmgd->rssi_min_thold &&
2479                            (last_sig >= ifmgd->rssi_max_thold ||
2480                            last_sig == 0)) {
2481                         ifmgd->last_ave_beacon_signal = sig;
2482                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2483                 }
2484         }
2485
2486         if (bss_conf->cqm_rssi_thold &&
2487             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2488             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2489                 int sig = ifmgd->ave_beacon_signal / 16;
2490                 int last_event = ifmgd->last_cqm_event_signal;
2491                 int thold = bss_conf->cqm_rssi_thold;
2492                 int hyst = bss_conf->cqm_rssi_hyst;
2493                 if (sig < thold &&
2494                     (last_event == 0 || sig < last_event - hyst)) {
2495                         ifmgd->last_cqm_event_signal = sig;
2496                         ieee80211_cqm_rssi_notify(
2497                                 &sdata->vif,
2498                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2499                                 GFP_KERNEL);
2500                 } else if (sig > thold &&
2501                            (last_event == 0 || sig > last_event + hyst)) {
2502                         ifmgd->last_cqm_event_signal = sig;
2503                         ieee80211_cqm_rssi_notify(
2504                                 &sdata->vif,
2505                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2506                                 GFP_KERNEL);
2507                 }
2508         }
2509
2510         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2511 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2512                 if (net_ratelimit()) {
2513                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
2514                                "to a received beacon\n", sdata->name);
2515                 }
2516 #endif
2517                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2518                 mutex_lock(&local->iflist_mtx);
2519                 ieee80211_recalc_ps(local, -1);
2520                 mutex_unlock(&local->iflist_mtx);
2521         }
2522
2523         /*
2524          * Push the beacon loss detection into the future since
2525          * we are processing a beacon from the AP just now.
2526          */
2527         ieee80211_sta_reset_beacon_monitor(sdata);
2528
2529         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2530         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2531                                           len - baselen, &elems,
2532                                           care_about_ies, ncrc);
2533
2534         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2535                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2536                                                    ifmgd->aid);
2537
2538         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
2539                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2540                                       true);
2541
2542                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2543                                          elems.wmm_param_len);
2544         }
2545
2546         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2547                 if (directed_tim) {
2548                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2549                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2550                                 ieee80211_hw_config(local,
2551                                                     IEEE80211_CONF_CHANGE_PS);
2552                                 ieee80211_send_nullfunc(local, sdata, 0);
2553                         } else {
2554                                 local->pspolling = true;
2555
2556                                 /*
2557                                  * Here is assumed that the driver will be
2558                                  * able to send ps-poll frame and receive a
2559                                  * response even though power save mode is
2560                                  * enabled, but some drivers might require
2561                                  * to disable power save here. This needs
2562                                  * to be investigated.
2563                                  */
2564                                 ieee80211_send_pspoll(local, sdata);
2565                         }
2566                 }
2567         }
2568
2569         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2570                 return;
2571         ifmgd->beacon_crc = ncrc;
2572         ifmgd->beacon_crc_valid = true;
2573
2574         if (elems.erp_info && elems.erp_info_len >= 1) {
2575                 erp_valid = true;
2576                 erp_value = elems.erp_info[0];
2577         } else {
2578                 erp_valid = false;
2579         }
2580         changed |= ieee80211_handle_bss_capability(sdata,
2581                         le16_to_cpu(mgmt->u.beacon.capab_info),
2582                         erp_valid, erp_value);
2583
2584
2585         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2586             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2587                 struct sta_info *sta;
2588                 struct ieee80211_supported_band *sband;
2589                 u16 ap_ht_cap_flags;
2590
2591                 rcu_read_lock();
2592
2593                 sta = sta_info_get(sdata, bssid);
2594                 if (WARN_ON(!sta)) {
2595                         rcu_read_unlock();
2596                         return;
2597                 }
2598
2599                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2600
2601                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2602                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2603
2604                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
2605
2606                 rcu_read_unlock();
2607
2608                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2609                                                bssid, ap_ht_cap_flags, true);
2610         }
2611
2612         /* Note: country IE parsing is done for us by cfg80211 */
2613         if (elems.country_elem) {
2614                 /* TODO: IBSS also needs this */
2615                 if (elems.pwr_constr_elem)
2616                         ieee80211_handle_pwr_constr(sdata,
2617                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2618                                 elems.pwr_constr_elem,
2619                                 elems.pwr_constr_elem_len);
2620         }
2621
2622         ieee80211_bss_info_change_notify(sdata, changed);
2623 }
2624
2625 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2626                                   struct sk_buff *skb)
2627 {
2628         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2629         struct ieee80211_rx_status *rx_status;
2630         struct ieee80211_mgmt *mgmt;
2631         struct cfg80211_bss *bss = NULL;
2632         enum rx_mgmt_action rma = RX_MGMT_NONE;
2633         u16 fc;
2634
2635         rx_status = (struct ieee80211_rx_status *) skb->cb;
2636         mgmt = (struct ieee80211_mgmt *) skb->data;
2637         fc = le16_to_cpu(mgmt->frame_control);
2638
2639         mutex_lock(&ifmgd->mtx);
2640
2641         switch (fc & IEEE80211_FCTL_STYPE) {
2642         case IEEE80211_STYPE_BEACON:
2643                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2644                 break;
2645         case IEEE80211_STYPE_PROBE_RESP:
2646                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2647                 break;
2648         case IEEE80211_STYPE_AUTH:
2649                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2650                 break;
2651         case IEEE80211_STYPE_DEAUTH:
2652                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2653                 break;
2654         case IEEE80211_STYPE_DISASSOC:
2655                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2656                 break;
2657         case IEEE80211_STYPE_ASSOC_RESP:
2658         case IEEE80211_STYPE_REASSOC_RESP:
2659                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2660                 break;
2661         case IEEE80211_STYPE_ACTION:
2662                 switch (mgmt->u.action.category) {
2663                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2664                         ieee80211_sta_process_chanswitch(sdata,
2665                                         &mgmt->u.action.u.chan_switch.sw_elem,
2666                                         (void *)ifmgd->associated->priv,
2667                                         rx_status->mactime);
2668                         break;
2669                 }
2670         }
2671         mutex_unlock(&ifmgd->mtx);
2672
2673         switch (rma) {
2674         case RX_MGMT_NONE:
2675                 /* no action */
2676                 break;
2677         case RX_MGMT_CFG80211_DEAUTH:
2678                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2679                 break;
2680         case RX_MGMT_CFG80211_DISASSOC:
2681                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2682                 break;
2683         case RX_MGMT_CFG80211_RX_AUTH:
2684                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2685                 break;
2686         case RX_MGMT_CFG80211_RX_ASSOC:
2687                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2688                 break;
2689         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2690                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2691                 break;
2692         default:
2693                 WARN(1, "unexpected: %d", rma);
2694         }
2695 }
2696
2697 static void ieee80211_sta_timer(unsigned long data)
2698 {
2699         struct ieee80211_sub_if_data *sdata =
2700                 (struct ieee80211_sub_if_data *) data;
2701         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2702         struct ieee80211_local *local = sdata->local;
2703
2704         if (local->quiescing) {
2705                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2706                 return;
2707         }
2708
2709         ieee80211_queue_work(&local->hw, &sdata->work);
2710 }
2711
2712 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2713                                           u8 *bssid, u8 reason)
2714 {
2715         struct ieee80211_local *local = sdata->local;
2716         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2717         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2718
2719         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2720                           IEEE80211_STA_BEACON_POLL);
2721
2722         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2723                                false, frame_buf);
2724         mutex_unlock(&ifmgd->mtx);
2725
2726         /*
2727          * must be outside lock due to cfg80211,
2728          * but that's not a problem.
2729          */
2730         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2731
2732         mutex_lock(&local->mtx);
2733         ieee80211_recalc_idle(local);
2734         mutex_unlock(&local->mtx);
2735
2736         mutex_lock(&ifmgd->mtx);
2737 }
2738
2739 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2740 {
2741         struct ieee80211_local *local = sdata->local;
2742         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2743         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2744
2745         lockdep_assert_held(&ifmgd->mtx);
2746
2747         if (WARN_ON_ONCE(!auth_data))
2748                 return -EINVAL;
2749
2750         if (!auth_data->synced) {
2751                 int ret = drv_tx_sync(local, sdata, auth_data->bss->bssid,
2752                                       IEEE80211_TX_SYNC_AUTH);
2753                 if (ret)
2754                         return ret;
2755         }
2756         auth_data->synced = true;
2757
2758         auth_data->tries++;
2759
2760         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2761                 printk(KERN_DEBUG "%s: authentication with %pM timed out\n",
2762                        sdata->name, auth_data->bss->bssid);
2763
2764                 /*
2765                  * Most likely AP is not in the range so remove the
2766                  * bss struct for that AP.
2767                  */
2768                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2769
2770                 return -ETIMEDOUT;
2771         }
2772
2773         if (auth_data->bss->proberesp_ies) {
2774                 printk(KERN_DEBUG "%s: send auth to %pM (try %d/%d)\n",
2775                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2776                        IEEE80211_AUTH_MAX_TRIES);
2777
2778                 auth_data->expected_transaction = 2;
2779                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2780                                     auth_data->ie, auth_data->ie_len,
2781                                     auth_data->bss->bssid,
2782                                     auth_data->bss->bssid, NULL, 0, 0);
2783         } else {
2784                 const u8 *ssidie;
2785
2786                 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
2787                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2788                        IEEE80211_AUTH_MAX_TRIES);
2789
2790                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2791                 if (!ssidie)
2792                         return -EINVAL;
2793                 /*
2794                  * Direct probe is sent to broadcast address as some APs
2795                  * will not answer to direct packet in unassociated state.
2796                  */
2797                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2798                                          NULL, 0, (u32) -1, true, false);
2799         }
2800
2801         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2802         run_again(ifmgd, auth_data->timeout);
2803
2804         return 0;
2805 }
2806
2807 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2808 {
2809         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2810         struct ieee80211_local *local = sdata->local;
2811
2812         lockdep_assert_held(&sdata->u.mgd.mtx);
2813
2814         if (!assoc_data->synced) {
2815                 int ret = drv_tx_sync(local, sdata, assoc_data->bss->bssid,
2816                                       IEEE80211_TX_SYNC_ASSOC);
2817                 if (ret)
2818                         return ret;
2819         }
2820         assoc_data->synced = true;
2821
2822         assoc_data->tries++;
2823         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2824                 printk(KERN_DEBUG "%s: association with %pM timed out\n",
2825                        sdata->name, assoc_data->bss->bssid);
2826
2827                 /*
2828                  * Most likely AP is not in the range so remove the
2829                  * bss struct for that AP.
2830                  */
2831                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2832
2833                 return -ETIMEDOUT;
2834         }
2835
2836         printk(KERN_DEBUG "%s: associate with %pM (try %d/%d)\n",
2837                sdata->name, assoc_data->bss->bssid, assoc_data->tries,
2838                IEEE80211_ASSOC_MAX_TRIES);
2839         ieee80211_send_assoc(sdata);
2840
2841         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2842         run_again(&sdata->u.mgd, assoc_data->timeout);
2843
2844         return 0;
2845 }
2846
2847 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2848 {
2849         struct ieee80211_local *local = sdata->local;
2850         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2851
2852         mutex_lock(&ifmgd->mtx);
2853
2854         if (ifmgd->auth_data &&
2855             time_after(jiffies, ifmgd->auth_data->timeout)) {
2856                 if (ifmgd->auth_data->done) {
2857                         /*
2858                          * ok ... we waited for assoc but userspace didn't,
2859                          * so let's just kill the auth data
2860                          */
2861                         ieee80211_destroy_auth_data(sdata, false);
2862                 } else if (ieee80211_probe_auth(sdata)) {
2863                         u8 bssid[ETH_ALEN];
2864
2865                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2866
2867                         ieee80211_destroy_auth_data(sdata, false);
2868
2869                         mutex_unlock(&ifmgd->mtx);
2870                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2871                         mutex_lock(&ifmgd->mtx);
2872                 }
2873         } else if (ifmgd->auth_data)
2874                 run_again(ifmgd, ifmgd->auth_data->timeout);
2875
2876         if (ifmgd->assoc_data &&
2877             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2878                 if (!ifmgd->assoc_data->have_beacon ||
2879                     ieee80211_do_assoc(sdata)) {
2880                         u8 bssid[ETH_ALEN];
2881
2882                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2883
2884                         ieee80211_destroy_assoc_data(sdata, false);
2885
2886                         mutex_unlock(&ifmgd->mtx);
2887                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2888                         mutex_lock(&ifmgd->mtx);
2889                 }
2890         } else if (ifmgd->assoc_data)
2891                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2892
2893         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2894                             IEEE80211_STA_CONNECTION_POLL) &&
2895             ifmgd->associated) {
2896                 u8 bssid[ETH_ALEN];
2897                 int max_tries;
2898
2899                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2900
2901                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2902                         max_tries = max_nullfunc_tries;
2903                 else
2904                         max_tries = max_probe_tries;
2905
2906                 /* ACK received for nullfunc probing frame */
2907                 if (!ifmgd->probe_send_count)
2908                         ieee80211_reset_ap_probe(sdata);
2909                 else if (ifmgd->nullfunc_failed) {
2910                         if (ifmgd->probe_send_count < max_tries) {
2911 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2912                                 wiphy_debug(local->hw.wiphy,
2913                                             "%s: No ack for nullfunc frame to"
2914                                             " AP %pM, try %d/%i\n",
2915                                             sdata->name, bssid,
2916                                             ifmgd->probe_send_count, max_tries);
2917 #endif
2918                                 ieee80211_mgd_probe_ap_send(sdata);
2919                         } else {
2920 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2921                                 wiphy_debug(local->hw.wiphy,
2922                                             "%s: No ack for nullfunc frame to"
2923                                             " AP %pM, disconnecting.\n",
2924                                             sdata->name, bssid);
2925 #endif
2926                                 ieee80211_sta_connection_lost(sdata, bssid,
2927                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2928                         }
2929                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2930                         run_again(ifmgd, ifmgd->probe_timeout);
2931                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2932 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2933                         wiphy_debug(local->hw.wiphy,
2934                                     "%s: Failed to send nullfunc to AP %pM"
2935                                     " after %dms, disconnecting.\n",
2936                                     sdata->name,
2937                                     bssid, probe_wait_ms);
2938 #endif
2939                         ieee80211_sta_connection_lost(sdata, bssid,
2940                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2941                 } else if (ifmgd->probe_send_count < max_tries) {
2942 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2943                         wiphy_debug(local->hw.wiphy,
2944                                     "%s: No probe response from AP %pM"
2945                                     " after %dms, try %d/%i\n",
2946                                     sdata->name,
2947                                     bssid, probe_wait_ms,
2948                                     ifmgd->probe_send_count, max_tries);
2949 #endif
2950                         ieee80211_mgd_probe_ap_send(sdata);
2951                 } else {
2952                         /*
2953                          * We actually lost the connection ... or did we?
2954                          * Let's make sure!
2955                          */
2956                         wiphy_debug(local->hw.wiphy,
2957                                     "%s: No probe response from AP %pM"
2958                                     " after %dms, disconnecting.\n",
2959                                     sdata->name,
2960                                     bssid, probe_wait_ms);
2961
2962                         ieee80211_sta_connection_lost(sdata, bssid,
2963                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2964                 }
2965         }
2966
2967         mutex_unlock(&ifmgd->mtx);
2968
2969         mutex_lock(&local->mtx);
2970         ieee80211_recalc_idle(local);
2971         mutex_unlock(&local->mtx);
2972 }
2973
2974 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2975 {
2976         struct ieee80211_sub_if_data *sdata =
2977                 (struct ieee80211_sub_if_data *) data;
2978         struct ieee80211_local *local = sdata->local;
2979
2980         if (local->quiescing)
2981                 return;
2982
2983         ieee80211_queue_work(&sdata->local->hw,
2984                              &sdata->u.mgd.beacon_connection_loss_work);
2985 }
2986
2987 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2988 {
2989         struct ieee80211_sub_if_data *sdata =
2990                 (struct ieee80211_sub_if_data *) data;
2991         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2992         struct ieee80211_local *local = sdata->local;
2993
2994         if (local->quiescing)
2995                 return;
2996
2997         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2998 }
2999
3000 static void ieee80211_sta_monitor_work(struct work_struct *work)
3001 {
3002         struct ieee80211_sub_if_data *sdata =
3003                 container_of(work, struct ieee80211_sub_if_data,
3004                              u.mgd.monitor_work);
3005
3006         ieee80211_mgd_probe_ap(sdata, false);
3007 }
3008
3009 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3010 {
3011         u32 flags;
3012
3013         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3014                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
3015                                         IEEE80211_STA_CONNECTION_POLL);
3016
3017                 /* let's probe the connection once */
3018                 flags = sdata->local->hw.flags;
3019                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3020                         ieee80211_queue_work(&sdata->local->hw,
3021                                              &sdata->u.mgd.monitor_work);
3022                 /* and do all the other regular work too */
3023                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3024         }
3025 }
3026
3027 #ifdef CONFIG_PM
3028 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
3029 {
3030         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3031
3032         /*
3033          * we need to use atomic bitops for the running bits
3034          * only because both timers might fire at the same
3035          * time -- the code here is properly synchronised.
3036          */
3037
3038         cancel_work_sync(&ifmgd->request_smps_work);
3039
3040         cancel_work_sync(&ifmgd->monitor_work);
3041         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
3042         if (del_timer_sync(&ifmgd->timer))
3043                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
3044
3045         cancel_work_sync(&ifmgd->chswitch_work);
3046         if (del_timer_sync(&ifmgd->chswitch_timer))
3047                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
3048
3049         /* these will just be re-established on connection */
3050         del_timer_sync(&ifmgd->conn_mon_timer);
3051         del_timer_sync(&ifmgd->bcn_mon_timer);
3052 }
3053
3054 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3055 {
3056         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3057
3058         if (!ifmgd->associated)
3059                 return;
3060
3061         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3062                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3063                 mutex_lock(&ifmgd->mtx);
3064                 if (ifmgd->associated) {
3065 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
3066                         wiphy_debug(sdata->local->hw.wiphy,
3067                                     "%s: driver requested disconnect after resume.\n",
3068                                     sdata->name);
3069 #endif
3070                         ieee80211_sta_connection_lost(sdata,
3071                                 ifmgd->associated->bssid,
3072                                 WLAN_REASON_UNSPECIFIED);
3073                         mutex_unlock(&ifmgd->mtx);
3074                         return;
3075                 }
3076                 mutex_unlock(&ifmgd->mtx);
3077         }
3078
3079         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
3080                 add_timer(&ifmgd->timer);
3081         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
3082                 add_timer(&ifmgd->chswitch_timer);
3083         ieee80211_sta_reset_beacon_monitor(sdata);
3084         ieee80211_restart_sta_timer(sdata);
3085 }
3086 #endif
3087
3088 /* interface setup */
3089 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3090 {
3091         struct ieee80211_if_managed *ifmgd;
3092
3093         ifmgd = &sdata->u.mgd;
3094         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3095         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3096         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3097                   ieee80211_beacon_connection_loss_work);
3098         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3099         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3100                     (unsigned long) sdata);
3101         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3102                     (unsigned long) sdata);
3103         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3104                     (unsigned long) sdata);
3105         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3106                     (unsigned long) sdata);
3107
3108         ifmgd->flags = 0;
3109         ifmgd->powersave = sdata->wdev.ps;
3110
3111         mutex_init(&ifmgd->mtx);
3112
3113         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3114                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3115         else
3116                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3117 }
3118
3119 /* scan finished notification */
3120 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3121 {
3122         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
3123
3124         /* Restart STA timers */
3125         rcu_read_lock();
3126         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3127                 ieee80211_restart_sta_timer(sdata);
3128         rcu_read_unlock();
3129 }
3130
3131 int ieee80211_max_network_latency(struct notifier_block *nb,
3132                                   unsigned long data, void *dummy)
3133 {
3134         s32 latency_usec = (s32) data;
3135         struct ieee80211_local *local =
3136                 container_of(nb, struct ieee80211_local,
3137                              network_latency_notifier);
3138
3139         mutex_lock(&local->iflist_mtx);
3140         ieee80211_recalc_ps(local, latency_usec);
3141         mutex_unlock(&local->iflist_mtx);
3142
3143         return 0;
3144 }
3145
3146 /* config hooks */
3147 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3148                        struct cfg80211_auth_request *req)
3149 {
3150         struct ieee80211_local *local = sdata->local;
3151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3152         struct ieee80211_mgd_auth_data *auth_data;
3153         struct sta_info *sta;
3154         u16 auth_alg;
3155         int err;
3156
3157         /* prepare auth data structure */
3158
3159         switch (req->auth_type) {
3160         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3161                 auth_alg = WLAN_AUTH_OPEN;
3162                 break;
3163         case NL80211_AUTHTYPE_SHARED_KEY:
3164                 if (IS_ERR(local->wep_tx_tfm))
3165                         return -EOPNOTSUPP;
3166                 auth_alg = WLAN_AUTH_SHARED_KEY;
3167                 break;
3168         case NL80211_AUTHTYPE_FT:
3169                 auth_alg = WLAN_AUTH_FT;
3170                 break;
3171         case NL80211_AUTHTYPE_NETWORK_EAP:
3172                 auth_alg = WLAN_AUTH_LEAP;
3173                 break;
3174         default:
3175                 return -EOPNOTSUPP;
3176         }
3177
3178         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3179         if (!auth_data)
3180                 return -ENOMEM;
3181
3182         auth_data->bss = req->bss;
3183
3184         if (req->ie && req->ie_len) {
3185                 memcpy(auth_data->ie, req->ie, req->ie_len);
3186                 auth_data->ie_len = req->ie_len;
3187         }
3188
3189         if (req->key && req->key_len) {
3190                 auth_data->key_len = req->key_len;
3191                 auth_data->key_idx = req->key_idx;
3192                 memcpy(auth_data->key, req->key, req->key_len);
3193         }
3194
3195         auth_data->algorithm = auth_alg;
3196
3197         /* try to authenticate/probe */
3198
3199         mutex_lock(&ifmgd->mtx);
3200
3201         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3202             ifmgd->assoc_data) {
3203                 err = -EBUSY;
3204                 goto err_free;
3205         }
3206
3207         if (ifmgd->auth_data)
3208                 ieee80211_destroy_auth_data(sdata, false);
3209
3210         /* prep auth_data so we don't go into idle on disassoc */
3211         ifmgd->auth_data = auth_data;
3212
3213         if (ifmgd->associated)
3214                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3215
3216         printk(KERN_DEBUG "%s: authenticate with %pM\n",
3217                sdata->name, req->bss->bssid);
3218
3219         mutex_lock(&local->mtx);
3220         ieee80211_recalc_idle(sdata->local);
3221         mutex_unlock(&local->mtx);
3222
3223         /* switch to the right channel */
3224         local->oper_channel = req->bss->channel;
3225         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3226
3227         /* set BSSID */
3228         memcpy(ifmgd->bssid, req->bss->bssid, ETH_ALEN);
3229         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3230
3231         /* add station entry */
3232         sta = sta_info_alloc(sdata, req->bss->bssid, GFP_KERNEL);
3233         if (!sta) {
3234                 err = -ENOMEM;
3235                 goto err_clear;
3236         }
3237
3238         err = sta_info_insert(sta);
3239         if (err) {
3240                 printk(KERN_DEBUG
3241                        "%s: failed to insert STA entry for the AP %pM (error %d)\n",
3242                        sdata->name, req->bss->bssid, err);
3243                 goto err_clear;
3244         }
3245
3246         err = ieee80211_probe_auth(sdata);
3247         if (err) {
3248                 if (auth_data->synced)
3249                         drv_finish_tx_sync(local, sdata, req->bss->bssid,
3250                                            IEEE80211_TX_SYNC_AUTH);
3251                 sta_info_destroy_addr(sdata, req->bss->bssid);
3252                 goto err_clear;
3253         }
3254
3255         /* hold our own reference */
3256         cfg80211_ref_bss(auth_data->bss);
3257         err = 0;
3258         goto out_unlock;
3259
3260  err_clear:
3261         ifmgd->auth_data = NULL;
3262  err_free:
3263         kfree(auth_data);
3264  out_unlock:
3265         mutex_unlock(&ifmgd->mtx);
3266
3267         return err;
3268 }
3269
3270 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3271                         struct cfg80211_assoc_request *req)
3272 {
3273         struct ieee80211_local *local = sdata->local;
3274         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3275         struct ieee80211_bss *bss = (void *)req->bss->priv;
3276         struct ieee80211_mgd_assoc_data *assoc_data;
3277         struct sta_info *sta;
3278         const u8 *ssidie;
3279         int i, err;
3280
3281         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3282         if (!ssidie)
3283                 return -EINVAL;
3284
3285         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3286         if (!assoc_data)
3287                 return -ENOMEM;
3288
3289         mutex_lock(&ifmgd->mtx);
3290
3291         if (ifmgd->associated)
3292                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3293
3294         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3295                 err = -EBUSY;
3296                 goto err_free;
3297         }
3298
3299         if (ifmgd->assoc_data) {
3300                 err = -EBUSY;
3301                 goto err_free;
3302         }
3303
3304         if (ifmgd->auth_data) {
3305                 bool match;
3306
3307                 /* keep sta info, bssid if matching */
3308                 match = compare_ether_addr(ifmgd->bssid, req->bss->bssid) == 0;
3309                 ieee80211_destroy_auth_data(sdata, match);
3310         }
3311
3312         /* prepare assoc data */
3313
3314         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3315         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3316
3317         ifmgd->beacon_crc_valid = false;
3318
3319         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
3320                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3321                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3322                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
3323                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3324
3325         if (req->flags & ASSOC_REQ_DISABLE_HT)
3326                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3327
3328         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3329         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3330                sizeof(ifmgd->ht_capa_mask));
3331
3332         if (req->ie && req->ie_len) {
3333                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3334                 assoc_data->ie_len = req->ie_len;
3335         }
3336
3337         assoc_data->bss = req->bss;
3338
3339         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3340                 if (ifmgd->powersave)
3341                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3342                 else
3343                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3344         } else
3345                 ifmgd->ap_smps = ifmgd->req_smps;
3346
3347         /*
3348          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3349          * We still associate in non-HT mode (11a/b/g) if any one of these
3350          * ciphers is configured as pairwise.
3351          * We can set this to true for non-11n hardware, that'll be checked
3352          * separately along with the peer capabilities.
3353          */
3354         assoc_data->capability = req->bss->capability;
3355         assoc_data->wmm_used = bss->wmm_used;
3356         assoc_data->supp_rates = bss->supp_rates;
3357         assoc_data->supp_rates_len = bss->supp_rates_len;
3358         assoc_data->ht_information_ie =
3359                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
3360
3361         if (bss->wmm_used && bss->uapsd_supported &&
3362             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3363                 assoc_data->uapsd_used = true;
3364                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3365         } else {
3366                 assoc_data->uapsd_used = false;
3367                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3368         }
3369
3370         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3371         assoc_data->ssid_len = ssidie[1];
3372
3373         if (req->prev_bssid)
3374                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3375
3376         if (req->use_mfp) {
3377                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3378                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3379         } else {
3380                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3381                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3382         }
3383
3384         if (req->crypto.control_port)
3385                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3386         else
3387                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3388
3389         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3390         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3391
3392         /* kick off associate process */
3393
3394         ifmgd->assoc_data = assoc_data;
3395
3396         mutex_lock(&local->mtx);
3397         ieee80211_recalc_idle(sdata->local);
3398         mutex_unlock(&local->mtx);
3399
3400         /* switch to the right channel */
3401         local->oper_channel = req->bss->channel;
3402         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3403
3404         rcu_read_lock();
3405         sta = sta_info_get(sdata, req->bss->bssid);
3406         rcu_read_unlock();
3407
3408         if (!sta) {
3409                 /* set BSSID */
3410                 memcpy(ifmgd->bssid, req->bss->bssid, ETH_ALEN);
3411                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3412
3413                 sta = sta_info_alloc(sdata, req->bss->bssid, GFP_KERNEL);
3414                 if (!sta) {
3415                         err = -ENOMEM;
3416                         goto err_clear;
3417                 }
3418
3419                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3420
3421                 err = sta_info_insert(sta);
3422                 sta = NULL;
3423                 if (err) {
3424                         printk(KERN_DEBUG
3425                                "%s: failed to insert STA entry for the AP (error %d)\n",
3426                                sdata->name, err);
3427                         goto err_clear;
3428                 }
3429         } else
3430                 WARN_ON_ONCE(compare_ether_addr(ifmgd->bssid, req->bss->bssid));
3431
3432         if (!bss->dtim_period &&
3433             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3434                 /*
3435                  * Wait up to one beacon interval ...
3436                  * should this be more if we miss one?
3437                  */
3438                 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
3439                        sdata->name, ifmgd->bssid);
3440                 assoc_data->timeout = jiffies +
3441                                 TU_TO_EXP_TIME(req->bss->beacon_interval);
3442         } else {
3443                 assoc_data->have_beacon = true;
3444                 assoc_data->sent_assoc = false;
3445                 assoc_data->timeout = jiffies;
3446         }
3447         run_again(ifmgd, assoc_data->timeout);
3448
3449         if (bss->corrupt_data) {
3450                 char *corrupt_type = "data";
3451                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3452                         if (bss->corrupt_data &
3453                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3454                                 corrupt_type = "beacon and probe response";
3455                         else
3456                                 corrupt_type = "beacon";
3457                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3458                         corrupt_type = "probe response";
3459                 printk(KERN_DEBUG "%s: associating with AP with corrupt %s\n",
3460                        sdata->name, corrupt_type);
3461         }
3462
3463         err = 0;
3464         goto out;
3465  err_clear:
3466         ifmgd->assoc_data = NULL;
3467  err_free:
3468         kfree(assoc_data);
3469  out:
3470         mutex_unlock(&ifmgd->mtx);
3471
3472         return err;
3473 }
3474
3475 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3476                          struct cfg80211_deauth_request *req)
3477 {
3478         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3479         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3480
3481         mutex_lock(&ifmgd->mtx);
3482
3483         if (ifmgd->auth_data) {
3484                 ieee80211_destroy_auth_data(sdata, false);
3485                 mutex_unlock(&ifmgd->mtx);
3486                 return 0;
3487         }
3488
3489         printk(KERN_DEBUG
3490                "%s: deauthenticating from %pM by local choice (reason=%d)\n",
3491                sdata->name, req->bssid, req->reason_code);
3492
3493         if (ifmgd->associated &&
3494             compare_ether_addr(ifmgd->associated->bssid, req->bssid) == 0)
3495                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3496                                        req->reason_code, true, frame_buf);
3497         else
3498                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3499                                                IEEE80211_STYPE_DEAUTH,
3500                                                req->reason_code, true,
3501                                                frame_buf);
3502         mutex_unlock(&ifmgd->mtx);
3503
3504         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3505
3506         mutex_lock(&sdata->local->mtx);
3507         ieee80211_recalc_idle(sdata->local);
3508         mutex_unlock(&sdata->local->mtx);
3509
3510         return 0;
3511 }
3512
3513 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3514                            struct cfg80211_disassoc_request *req)
3515 {
3516         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3517         u8 bssid[ETH_ALEN];
3518         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3519
3520         mutex_lock(&ifmgd->mtx);
3521
3522         /*
3523          * cfg80211 should catch this ... but it's racy since
3524          * we can receive a disassoc frame, process it, hand it
3525          * to cfg80211 while that's in a locked section already
3526          * trying to tell us that the user wants to disconnect.
3527          */
3528         if (ifmgd->associated != req->bss) {
3529                 mutex_unlock(&ifmgd->mtx);
3530                 return -ENOLINK;
3531         }
3532
3533         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
3534                sdata->name, req->bss->bssid, req->reason_code);
3535
3536         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3537         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3538                                req->reason_code, !req->local_state_change,
3539                                frame_buf);
3540         mutex_unlock(&ifmgd->mtx);
3541
3542         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3543
3544         mutex_lock(&sdata->local->mtx);
3545         ieee80211_recalc_idle(sdata->local);
3546         mutex_unlock(&sdata->local->mtx);
3547
3548         return 0;
3549 }
3550
3551 void ieee80211_mgd_teardown(struct ieee80211_sub_if_data *sdata)
3552 {
3553         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3554
3555         mutex_lock(&ifmgd->mtx);
3556         if (ifmgd->assoc_data)
3557                 ieee80211_destroy_assoc_data(sdata, false);
3558         if (ifmgd->auth_data)
3559                 ieee80211_destroy_auth_data(sdata, false);
3560         del_timer_sync(&ifmgd->timer);
3561         mutex_unlock(&ifmgd->mtx);
3562 }
3563
3564 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3565                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3566                                gfp_t gfp)
3567 {
3568         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3569
3570         trace_api_cqm_rssi_notify(sdata, rssi_event);
3571
3572         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3573 }
3574 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
3575
3576 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
3577 {
3578         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3579         return sdata->dev->operstate;
3580 }
3581 EXPORT_SYMBOL(ieee80211_get_operstate);