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 rx_channel_type = NL80211_CHAN_NO_HT;
 193         enum nl80211_channel_type tx_channel_type;
 194
 195         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 196         prev_chantype = sdata->vif.bss_conf.channel_type;
 197
 198
 199         hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
 200                                                    sband->band);
 201         /* check that channel matches the right operating channel */
 202         if (local->hw.conf.channel->center_freq != hti_cfreq) {
 203                 /* Some APs mess this up, evidently.
 204                  * Netgear WNDR3700 sometimes reports 4 higher than
 205                  * the actual channel, for instance.
 206                  */
 207                 printk(KERN_DEBUG
 208                        "%s: Wrong control channel in association"
 209                        " response: configured center-freq: %d"
 210                        " hti-cfreq: %d  hti->control_chan: %d"
 211                        " band: %d.  Disabling HT.\n",
 212                        sdata->name,
 213                        local->hw.conf.channel->center_freq,
 214                        hti_cfreq, hti->control_chan,
 215                        sband->band);
 216                 enable_ht = false;
 217         }
 218
 219         if (enable_ht) {
 220                 rx_channel_type = NL80211_CHAN_HT20;
 221
 222                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 223                     !ieee80111_cfg_override_disables_ht40(sdata) &&
 224                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 225                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 226                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 227                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 228                                 rx_channel_type = NL80211_CHAN_HT40PLUS;
 229                                 break;
 230                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 231                                 rx_channel_type = NL80211_CHAN_HT40MINUS;
 232                                 break;
 233                         }
 234                 }
 235         }
 236
 237         tx_channel_type = ieee80211_get_tx_channel_type(local, rx_channel_type);
 238
 239         if (local->tmp_channel)
 240                 local->tmp_channel_type = rx_channel_type;
 241
 242         if (!ieee80211_set_channel_type(local, sdata, rx_channel_type)) {
 243                 /* can only fail due to HT40+/- mismatch */
 244                 rx_channel_type = NL80211_CHAN_HT20;
 245                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
 246                                                     rx_channel_type));
 247         }
 248
 249         if (beacon_htcap_ie && (prev_chantype != rx_channel_type)) {
 250                 /*
 251                  * Whenever the AP announces the HT mode change that can be
 252                  * 40MHz intolerant or etc., it would be safer to stop tx
 253                  * queues before doing hw config to avoid buffer overflow.
 254                  */
 255                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 256                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 257
 258                 /* flush out all packets */
 259                 synchronize_net();
 260
 261                 drv_flush(local, false);
 262         }
 263
 264         /* channel_type change automatically detected */
 265         ieee80211_hw_config(local, 0);
 266
 267         if (prev_chantype != tx_channel_type) {
 268                 rcu_read_lock();
 269                 sta = sta_info_get(sdata, bssid);
 270                 if (sta)
 271                         rate_control_rate_update(local, sband, sta,
 272                                                  IEEE80211_RC_HT_CHANGED,
 273                                                  tx_channel_type);
 274                 rcu_read_unlock();
 275
 276                 if (beacon_htcap_ie)
 277                         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 278                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 279         }
 280
 281         ht_opmode = le16_to_cpu(hti->operation_mode);
 282
 283         /* if bss configuration changed store the new one */
 284         if (sdata->ht_opmode_valid != enable_ht ||
 285             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 286             prev_chantype != rx_channel_type) {
 287                 changed |= BSS_CHANGED_HT;
 288                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 289                 sdata->ht_opmode_valid = enable_ht;
 290         }
 291
 292         return changed;
 293 }
 294
 295 /* frame sending functions */
 296
 297 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 298                                       struct ieee80211_supported_band *sband,
 299                                       u32 *rates)
 300 {
 301         int i, j, count;
 302         *rates = 0;
 303         count = 0;
 304         for (i = 0; i < supp_rates_len; i++) {
 305                 int rate = (supp_rates[i] & 0x7F) * 5;
 306
 307                 for (j = 0; j < sband->n_bitrates; j++)
 308                         if (sband->bitrates[j].bitrate == rate) {
 309                                 *rates |= BIT(j);
 310                                 count++;
 311                                 break;
 312                         }
 313         }
 314
 315         return count;
 316 }
 317
 318 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 319                                 struct sk_buff *skb, const u8 *ht_info_ie,
 320                                 struct ieee80211_supported_band *sband,
 321                                 struct ieee80211_channel *channel,
 322                                 enum ieee80211_smps_mode smps)
 323 {
 324         struct ieee80211_ht_info *ht_info;
 325         u8 *pos;
 326         u32 flags = channel->flags;
 327         u16 cap;
 328         struct ieee80211_sta_ht_cap ht_cap;
 329
 330         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 331
 332         if (!ht_info_ie)
 333                 return;
 334
 335         if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
 336                 return;
 337
 338         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 339         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 340
 341         ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
 342
 343         /* determine capability flags */
 344         cap = ht_cap.cap;
 345
 346         switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 347         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 348                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 349                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 350                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 351                 }
 352                 break;
 353         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 354                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 355                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 356                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 357                 }
 358                 break;
 359         }
 360
 361         /* set SM PS mode properly */
 362         cap &= ~IEEE80211_HT_CAP_SM_PS;
 363         switch (smps) {
 364         case IEEE80211_SMPS_AUTOMATIC:
 365         case IEEE80211_SMPS_NUM_MODES:
 366                 WARN_ON(1);
 367         case IEEE80211_SMPS_OFF:
 368                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 369                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 370                 break;
 371         case IEEE80211_SMPS_STATIC:
 372                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 373                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 374                 break;
 375         case IEEE80211_SMPS_DYNAMIC:
 376                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 377                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 378                 break;
 379         }
 380
 381         /* reserve and fill IE */
 382         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 383         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 384 }
 385
 386 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 387 {
 388         struct ieee80211_local *local = sdata->local;
 389         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 390         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 391         struct sk_buff *skb;
 392         struct ieee80211_mgmt *mgmt;
 393         u8 *pos, qos_info;
 394         size_t offset = 0, noffset;
 395         int i, count, rates_len, supp_rates_len;
 396         u16 capab;
 397         struct ieee80211_supported_band *sband;
 398         u32 rates = 0;
 399
 400         lockdep_assert_held(&ifmgd->mtx);
 401
 402         sband = local->hw.wiphy->bands[local->oper_channel->band];
 403
 404         if (assoc_data->supp_rates_len) {
 405                 /*
 406                  * Get all rates supported by the device and the AP as
 407                  * some APs don't like getting a superset of their rates
 408                  * in the association request (e.g. D-Link DAP 1353 in
 409                  * b-only mode)...
 410                  */
 411                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 412                                                        assoc_data->supp_rates_len,
 413                                                        sband, &rates);
 414         } else {
 415                 /*
 416                  * In case AP not provide any supported rates information
 417                  * before association, we send information element(s) with
 418                  * all rates that we support.
 419                  */
 420                 rates = ~0;
 421                 rates_len = sband->n_bitrates;
 422         }
 423
 424         skb = alloc_skb(local->hw.extra_tx_headroom +
 425                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 426                         2 + assoc_data->ssid_len + /* SSID */
 427                         4 + rates_len + /* (extended) rates */
 428                         4 + /* power capability */
 429                         2 + 2 * sband->n_channels + /* supported channels */
 430                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 431                         assoc_data->ie_len + /* extra IEs */
 432                         9, /* WMM */
 433                         GFP_KERNEL);
 434         if (!skb)
 435                 return;
 436
 437         skb_reserve(skb, local->hw.extra_tx_headroom);
 438
 439         capab = WLAN_CAPABILITY_ESS;
 440
 441         if (sband->band == IEEE80211_BAND_2GHZ) {
 442                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 443                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 444                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 445                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 446         }
 447
 448         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 449                 capab |= WLAN_CAPABILITY_PRIVACY;
 450
 451         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 452             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 453                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 454
 455         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 456         memset(mgmt, 0, 24);
 457         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 458         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 459         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 460
 461         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 462                 skb_put(skb, 10);
 463                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 464                                                   IEEE80211_STYPE_REASSOC_REQ);
 465                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 466                 mgmt->u.reassoc_req.listen_interval =
 467                                 cpu_to_le16(local->hw.conf.listen_interval);
 468                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 469                        ETH_ALEN);
 470         } else {
 471                 skb_put(skb, 4);
 472                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 473                                                   IEEE80211_STYPE_ASSOC_REQ);
 474                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 475                 mgmt->u.assoc_req.listen_interval =
 476                                 cpu_to_le16(local->hw.conf.listen_interval);
 477         }
 478
 479         /* SSID */
 480         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 481         *pos++ = WLAN_EID_SSID;
 482         *pos++ = assoc_data->ssid_len;
 483         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 484
 485         /* add all rates which were marked to be used above */
 486         supp_rates_len = rates_len;
 487         if (supp_rates_len > 8)
 488                 supp_rates_len = 8;
 489
 490         pos = skb_put(skb, supp_rates_len + 2);
 491         *pos++ = WLAN_EID_SUPP_RATES;
 492         *pos++ = supp_rates_len;
 493
 494         count = 0;
 495         for (i = 0; i < sband->n_bitrates; i++) {
 496                 if (BIT(i) & rates) {
 497                         int rate = sband->bitrates[i].bitrate;
 498                         *pos++ = (u8) (rate / 5);
 499                         if (++count == 8)
 500                                 break;
 501                 }
 502         }
 503
 504         if (rates_len > count) {
 505                 pos = skb_put(skb, rates_len - count + 2);
 506                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 507                 *pos++ = rates_len - count;
 508
 509                 for (i++; i < sband->n_bitrates; i++) {
 510                         if (BIT(i) & rates) {
 511                                 int rate = sband->bitrates[i].bitrate;
 512                                 *pos++ = (u8) (rate / 5);
 513                         }
 514                 }
 515         }
 516
 517         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 518                 /* 1. power capabilities */
 519                 pos = skb_put(skb, 4);
 520                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 521                 *pos++ = 2;
 522                 *pos++ = 0; /* min tx power */
 523                 *pos++ = local->oper_channel->max_power; /* max tx power */
 524
 525                 /* 2. supported channels */
 526                 /* TODO: get this in reg domain format */
 527                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 528                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 529                 *pos++ = 2 * sband->n_channels;
 530                 for (i = 0; i < sband->n_channels; i++) {
 531                         *pos++ = ieee80211_frequency_to_channel(
 532                                         sband->channels[i].center_freq);
 533                         *pos++ = 1; /* one channel in the subband*/
 534                 }
 535         }
 536
 537         /* if present, add any custom IEs that go before HT */
 538         if (assoc_data->ie_len && assoc_data->ie) {
 539                 static const u8 before_ht[] = {
 540                         WLAN_EID_SSID,
 541                         WLAN_EID_SUPP_RATES,
 542                         WLAN_EID_EXT_SUPP_RATES,
 543                         WLAN_EID_PWR_CAPABILITY,
 544                         WLAN_EID_SUPPORTED_CHANNELS,
 545                         WLAN_EID_RSN,
 546                         WLAN_EID_QOS_CAPA,
 547                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 548                         WLAN_EID_MOBILITY_DOMAIN,
 549                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 550                 };
 551                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 552                                              before_ht, ARRAY_SIZE(before_ht),
 553                                              offset);
 554                 pos = skb_put(skb, noffset - offset);
 555                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 556                 offset = noffset;
 557         }
 558
 559         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 560                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ht_information_ie,
 561                                     sband, local->oper_channel, ifmgd->ap_smps);
 562
 563         /* if present, add any custom non-vendor IEs that go after HT */
 564         if (assoc_data->ie_len && assoc_data->ie) {
 565                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 566                                                     assoc_data->ie_len,
 567                                                     offset);
 568                 pos = skb_put(skb, noffset - offset);
 569                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 570                 offset = noffset;
 571         }
 572
 573         if (assoc_data->wmm) {
 574                 if (assoc_data->uapsd) {
 575                         qos_info = ifmgd->uapsd_queues;
 576                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 577                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 578                 } else {
 579                         qos_info = 0;
 580                 }
 581
 582                 pos = skb_put(skb, 9);
 583                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 584                 *pos++ = 7; /* len */
 585                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 586                 *pos++ = 0x50;
 587                 *pos++ = 0xf2;
 588                 *pos++ = 2; /* WME */
 589                 *pos++ = 0; /* WME info */
 590                 *pos++ = 1; /* WME ver */
 591                 *pos++ = qos_info;
 592         }
 593
 594         /* add any remaining custom (i.e. vendor specific here) IEs */
 595         if (assoc_data->ie_len && assoc_data->ie) {
 596                 noffset = assoc_data->ie_len;
 597                 pos = skb_put(skb, noffset - offset);
 598                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 599         }
 600
 601         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 602         ieee80211_tx_skb(sdata, skb);
 603 }
 604
 605 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 606                                            const u8 *bssid, u16 stype,
 607                                            u16 reason, bool send_frame,
 608                                            u8 *frame_buf)
 609 {
 610         struct ieee80211_local *local = sdata->local;
 611         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 612         struct sk_buff *skb;
 613         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 614
 615         /* build frame */
 616         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 617         mgmt->duration = 0; /* initialize only */
 618         mgmt->seq_ctrl = 0; /* initialize only */
 619         memcpy(mgmt->da, bssid, ETH_ALEN);
 620         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 621         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 622         /* u.deauth.reason_code == u.disassoc.reason_code */
 623         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 624
 625         if (send_frame) {
 626                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 627                                     DEAUTH_DISASSOC_LEN);
 628                 if (!skb)
 629                         return;
 630
 631                 skb_reserve(skb, local->hw.extra_tx_headroom);
 632
 633                 /* copy in frame */
 634                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 635                        mgmt, DEAUTH_DISASSOC_LEN);
 636
 637                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 638                         IEEE80211_SKB_CB(skb)->flags |=
 639                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 640                 ieee80211_tx_skb(sdata, skb);
 641         }
 642 }
 643
 644 void ieee80211_send_pspoll(struct ieee80211_local *local,
 645                            struct ieee80211_sub_if_data *sdata)
 646 {
 647         struct ieee80211_pspoll *pspoll;
 648         struct sk_buff *skb;
 649
 650         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 651         if (!skb)
 652                 return;
 653
 654         pspoll = (struct ieee80211_pspoll *) skb->data;
 655         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 656
 657         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 658         ieee80211_tx_skb(sdata, skb);
 659 }
 660
 661 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 662                              struct ieee80211_sub_if_data *sdata,
 663                              int powersave)
 664 {
 665         struct sk_buff *skb;
 666         struct ieee80211_hdr_3addr *nullfunc;
 667         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 668
 669         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 670         if (!skb)
 671                 return;
 672
 673         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 674         if (powersave)
 675                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 676
 677         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 678         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 679                             IEEE80211_STA_CONNECTION_POLL))
 680                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 681
 682         ieee80211_tx_skb(sdata, skb);
 683 }
 684
 685 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 686                                           struct ieee80211_sub_if_data *sdata)
 687 {
 688         struct sk_buff *skb;
 689         struct ieee80211_hdr *nullfunc;
 690         __le16 fc;
 691
 692         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 693                 return;
 694
 695         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 696         if (!skb)
 697                 return;
 698
 699         skb_reserve(skb, local->hw.extra_tx_headroom);
 700
 701         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 702         memset(nullfunc, 0, 30);
 703         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 704                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 705         nullfunc->frame_control = fc;
 706         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 707         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 708         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 709         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 710
 711         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 712         ieee80211_tx_skb(sdata, skb);
 713 }
 714
 715 /* spectrum management related things */
 716 static void ieee80211_chswitch_work(struct work_struct *work)
 717 {
 718         struct ieee80211_sub_if_data *sdata =
 719                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 720         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 721
 722         if (!ieee80211_sdata_running(sdata))
 723                 return;
 724
 725         mutex_lock(&ifmgd->mtx);
 726         if (!ifmgd->associated)
 727                 goto out;
 728
 729         sdata->local->oper_channel = sdata->local->csa_channel;
 730         if (!sdata->local->ops->channel_switch) {
 731                 /* call "hw_config" only if doing sw channel switch */
 732                 ieee80211_hw_config(sdata->local,
 733                         IEEE80211_CONF_CHANGE_CHANNEL);
 734         } else {
 735                 /* update the device channel directly */
 736                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 737         }
 738
 739         /* XXX: shouldn't really modify cfg80211-owned data! */
 740         ifmgd->associated->channel = sdata->local->oper_channel;
 741
 742         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 743                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 744  out:
 745         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 746         mutex_unlock(&ifmgd->mtx);
 747 }
 748
 749 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 750 {
 751         struct ieee80211_sub_if_data *sdata;
 752         struct ieee80211_if_managed *ifmgd;
 753
 754         sdata = vif_to_sdata(vif);
 755         ifmgd = &sdata->u.mgd;
 756
 757         trace_api_chswitch_done(sdata, success);
 758         if (!success) {
 759                 /*
 760                  * If the channel switch was not successful, stay
 761                  * around on the old channel. We currently lack
 762                  * good handling of this situation, possibly we
 763                  * should just drop the association.
 764                  */
 765                 sdata->local->csa_channel = sdata->local->oper_channel;
 766         }
 767
 768         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 769 }
 770 EXPORT_SYMBOL(ieee80211_chswitch_done);
 771
 772 static void ieee80211_chswitch_timer(unsigned long data)
 773 {
 774         struct ieee80211_sub_if_data *sdata =
 775                 (struct ieee80211_sub_if_data *) data;
 776         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 777
 778         if (sdata->local->quiescing) {
 779                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 780                 return;
 781         }
 782
 783         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 784 }
 785
 786 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 787                                       struct ieee80211_channel_sw_ie *sw_elem,
 788                                       struct ieee80211_bss *bss,
 789                                       u64 timestamp)
 790 {
 791         struct cfg80211_bss *cbss =
 792                 container_of((void *)bss, struct cfg80211_bss, priv);
 793         struct ieee80211_channel *new_ch;
 794         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 795         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 796                                                       cbss->channel->band);
 797
 798         ASSERT_MGD_MTX(ifmgd);
 799
 800         if (!ifmgd->associated)
 801                 return;
 802
 803         if (sdata->local->scanning)
 804                 return;
 805
 806         /* Disregard subsequent beacons if we are already running a timer
 807            processing a CSA */
 808
 809         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 810                 return;
 811
 812         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 813         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 814                 return;
 815
 816         sdata->local->csa_channel = new_ch;
 817
 818         if (sdata->local->ops->channel_switch) {
 819                 /* use driver's channel switch callback */
 820                 struct ieee80211_channel_switch ch_switch;
 821                 memset(&ch_switch, 0, sizeof(ch_switch));
 822                 ch_switch.timestamp = timestamp;
 823                 if (sw_elem->mode) {
 824                         ch_switch.block_tx = true;
 825                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 826                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 827                 }
 828                 ch_switch.channel = new_ch;
 829                 ch_switch.count = sw_elem->count;
 830                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 831                 drv_channel_switch(sdata->local, &ch_switch);
 832                 return;
 833         }
 834
 835         /* channel switch handled in software */
 836         if (sw_elem->count <= 1) {
 837                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 838         } else {
 839                 if (sw_elem->mode)
 840                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 841                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 842                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 843                 mod_timer(&ifmgd->chswitch_timer,
 844                           jiffies +
 845                           msecs_to_jiffies(sw_elem->count *
 846                                            cbss->beacon_interval));
 847         }
 848 }
 849
 850 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 851                                         u16 capab_info, u8 *pwr_constr_elem,
 852                                         u8 pwr_constr_elem_len)
 853 {
 854         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 855
 856         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 857                 return;
 858
 859         /* Power constraint IE length should be 1 octet */
 860         if (pwr_constr_elem_len != 1)
 861                 return;
 862
 863         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 864             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 865                 sdata->local->power_constr_level = *pwr_constr_elem;
 866                 ieee80211_hw_config(sdata->local, 0);
 867         }
 868 }
 869
 870 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 871 {
 872         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 873         struct ieee80211_local *local = sdata->local;
 874         struct ieee80211_conf *conf = &local->hw.conf;
 875
 876         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 877                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 878                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 879
 880         local->disable_dynamic_ps = false;
 881         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 882 }
 883 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 884
 885 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 886 {
 887         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 888         struct ieee80211_local *local = sdata->local;
 889         struct ieee80211_conf *conf = &local->hw.conf;
 890
 891         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 892                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 893                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 894
 895         local->disable_dynamic_ps = true;
 896         conf->dynamic_ps_timeout = 0;
 897         del_timer_sync(&local->dynamic_ps_timer);
 898         ieee80211_queue_work(&local->hw,
 899                              &local->dynamic_ps_enable_work);
 900 }
 901 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 902
 903 /* powersave */
 904 static void ieee80211_enable_ps(struct ieee80211_local *local,
 905                                 struct ieee80211_sub_if_data *sdata)
 906 {
 907         struct ieee80211_conf *conf = &local->hw.conf;
 908
 909         /*
 910          * If we are scanning right now then the parameters will
 911          * take effect when scan finishes.
 912          */
 913         if (local->scanning)
 914                 return;
 915
 916         if (conf->dynamic_ps_timeout > 0 &&
 917             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 918                 mod_timer(&local->dynamic_ps_timer, jiffies +
 919                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 920         } else {
 921                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 922                         ieee80211_send_nullfunc(local, sdata, 1);
 923
 924                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 925                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 926                         return;
 927
 928                 conf->flags |= IEEE80211_CONF_PS;
 929                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 930         }
 931 }
 932
 933 static void ieee80211_change_ps(struct ieee80211_local *local)
 934 {
 935         struct ieee80211_conf *conf = &local->hw.conf;
 936
 937         if (local->ps_sdata) {
 938                 ieee80211_enable_ps(local, local->ps_sdata);
 939         } else if (conf->flags & IEEE80211_CONF_PS) {
 940                 conf->flags &= ~IEEE80211_CONF_PS;
 941                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 942                 del_timer_sync(&local->dynamic_ps_timer);
 943                 cancel_work_sync(&local->dynamic_ps_enable_work);
 944         }
 945 }
 946
 947 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 948 {
 949         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 950         struct sta_info *sta = NULL;
 951         bool authorized = false;
 952
 953         if (!mgd->powersave)
 954                 return false;
 955
 956         if (mgd->broken_ap)
 957                 return false;
 958
 959         if (!mgd->associated)
 960                 return false;
 961
 962         if (!mgd->associated->beacon_ies)
 963                 return false;
 964
 965         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 966                           IEEE80211_STA_CONNECTION_POLL))
 967                 return false;
 968
 969         rcu_read_lock();
 970         sta = sta_info_get(sdata, mgd->bssid);
 971         if (sta)
 972                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 973         rcu_read_unlock();
 974
 975         return authorized;
 976 }
 977
 978 /* need to hold RTNL or interface lock */
 979 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 980 {
 981         struct ieee80211_sub_if_data *sdata, *found = NULL;
 982         int count = 0;
 983         int timeout;
 984
 985         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 986                 local->ps_sdata = NULL;
 987                 return;
 988         }
 989
 990         if (!list_empty(&local->work_list)) {
 991                 local->ps_sdata = NULL;
 992                 goto change;
 993         }
 994
 995         list_for_each_entry(sdata, &local->interfaces, list) {
 996                 if (!ieee80211_sdata_running(sdata))
 997                         continue;
 998                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 999                         /* If an AP vif is found, then disable PS
1000                          * by setting the count to zero thereby setting
1001                          * ps_sdata to NULL.
1002                          */
1003                         count = 0;
1004                         break;
1005                 }
1006                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1007                         continue;
1008                 found = sdata;
1009                 count++;
1010         }
1011
1012         if (count == 1 && ieee80211_powersave_allowed(found)) {
1013                 struct ieee80211_conf *conf = &local->hw.conf;
1014                 s32 beaconint_us;
1015
1016                 if (latency < 0)
1017                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1018
1019                 beaconint_us = ieee80211_tu_to_usec(
1020                                         found->vif.bss_conf.beacon_int);
1021
1022                 timeout = local->dynamic_ps_forced_timeout;
1023                 if (timeout < 0) {
1024                         /*
1025                          * Go to full PSM if the user configures a very low
1026                          * latency requirement.
1027                          * The 2000 second value is there for compatibility
1028                          * until the PM_QOS_NETWORK_LATENCY is configured
1029                          * with real values.
1030                          */
1031                         if (latency > (1900 * USEC_PER_MSEC) &&
1032                             latency != (2000 * USEC_PER_SEC))
1033                                 timeout = 0;
1034                         else
1035                                 timeout = 100;
1036                 }
1037                 local->dynamic_ps_user_timeout = timeout;
1038                 if (!local->disable_dynamic_ps)
1039                         conf->dynamic_ps_timeout =
1040                                 local->dynamic_ps_user_timeout;
1041
1042                 if (beaconint_us > latency) {
1043                         local->ps_sdata = NULL;
1044                 } else {
1045                         struct ieee80211_bss *bss;
1046                         int maxslp = 1;
1047                         u8 dtimper;
1048
1049                         bss = (void *)found->u.mgd.associated->priv;
1050                         dtimper = bss->dtim_period;
1051
1052                         /* If the TIM IE is invalid, pretend the value is 1 */
1053                         if (!dtimper)
1054                                 dtimper = 1;
1055                         else if (dtimper > 1)
1056                                 maxslp = min_t(int, dtimper,
1057                                                     latency / beaconint_us);
1058
1059                         local->hw.conf.max_sleep_period = maxslp;
1060                         local->hw.conf.ps_dtim_period = dtimper;
1061                         local->ps_sdata = found;
1062                 }
1063         } else {
1064                 local->ps_sdata = NULL;
1065         }
1066
1067  change:
1068         ieee80211_change_ps(local);
1069 }
1070
1071 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1072 {
1073         struct ieee80211_local *local =
1074                 container_of(work, struct ieee80211_local,
1075                              dynamic_ps_disable_work);
1076
1077         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1078                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1079                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1080         }
1081
1082         ieee80211_wake_queues_by_reason(&local->hw,
1083                                         IEEE80211_QUEUE_STOP_REASON_PS);
1084 }
1085
1086 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1087 {
1088         struct ieee80211_local *local =
1089                 container_of(work, struct ieee80211_local,
1090                              dynamic_ps_enable_work);
1091         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1092         struct ieee80211_if_managed *ifmgd;
1093         unsigned long flags;
1094         int q;
1095
1096         /* can only happen when PS was just disabled anyway */
1097         if (!sdata)
1098                 return;
1099
1100         ifmgd = &sdata->u.mgd;
1101
1102         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1103                 return;
1104
1105         if (!local->disable_dynamic_ps &&
1106             local->hw.conf.dynamic_ps_timeout > 0) {
1107                 /* don't enter PS if TX frames are pending */
1108                 if (drv_tx_frames_pending(local)) {
1109                         mod_timer(&local->dynamic_ps_timer, jiffies +
1110                                   msecs_to_jiffies(
1111                                   local->hw.conf.dynamic_ps_timeout));
1112                         return;
1113                 }
1114
1115                 /*
1116                  * transmission can be stopped by others which leads to
1117                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1118                  * is not the actual idle state.
1119                  */
1120                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1121                 for (q = 0; q < local->hw.queues; q++) {
1122                         if (local->queue_stop_reasons[q]) {
1123                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1124                                                        flags);
1125                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1126                                           msecs_to_jiffies(
1127                                           local->hw.conf.dynamic_ps_timeout));
1128                                 return;
1129                         }
1130                 }
1131                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1132         }
1133
1134         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1135             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1136                 netif_tx_stop_all_queues(sdata->dev);
1137
1138                 if (drv_tx_frames_pending(local))
1139                         mod_timer(&local->dynamic_ps_timer, jiffies +
1140                                   msecs_to_jiffies(
1141                                   local->hw.conf.dynamic_ps_timeout));
1142                 else {
1143                         ieee80211_send_nullfunc(local, sdata, 1);
1144                         /* Flush to get the tx status of nullfunc frame */
1145                         drv_flush(local, false);
1146                 }
1147         }
1148
1149         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1150               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1151             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1152                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1153                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1154                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1155         }
1156
1157         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1158                 netif_tx_wake_all_queues(sdata->dev);
1159 }
1160
1161 void ieee80211_dynamic_ps_timer(unsigned long data)
1162 {
1163         struct ieee80211_local *local = (void *) data;
1164
1165         if (local->quiescing || local->suspended)
1166                 return;
1167
1168         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1169 }
1170
1171 /* MLME */
1172 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
1173                                      struct ieee80211_sub_if_data *sdata,
1174                                      u8 *wmm_param, size_t wmm_param_len)
1175 {
1176         struct ieee80211_tx_queue_params params;
1177         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1178         size_t left;
1179         int count;
1180         u8 *pos, uapsd_queues = 0;
1181
1182         if (!local->ops->conf_tx)
1183                 return;
1184
1185         if (local->hw.queues < 4)
1186                 return;
1187
1188         if (!wmm_param)
1189                 return;
1190
1191         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1192                 return;
1193
1194         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1195                 uapsd_queues = ifmgd->uapsd_queues;
1196
1197         count = wmm_param[6] & 0x0f;
1198         if (count == ifmgd->wmm_last_param_set)
1199                 return;
1200         ifmgd->wmm_last_param_set = count;
1201
1202         pos = wmm_param + 8;
1203         left = wmm_param_len - 8;
1204
1205         memset(&params, 0, sizeof(params));
1206
1207         local->wmm_acm = 0;
1208         for (; left >= 4; left -= 4, pos += 4) {
1209                 int aci = (pos[0] >> 5) & 0x03;
1210                 int acm = (pos[0] >> 4) & 0x01;
1211                 bool uapsd = false;
1212                 int queue;
1213
1214                 switch (aci) {
1215                 case 1: /* AC_BK */
1216                         queue = 3;
1217                         if (acm)
1218                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1219                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1220                                 uapsd = true;
1221                         break;
1222                 case 2: /* AC_VI */
1223                         queue = 1;
1224                         if (acm)
1225                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1226                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1227                                 uapsd = true;
1228                         break;
1229                 case 3: /* AC_VO */
1230                         queue = 0;
1231                         if (acm)
1232                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1233                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1234                                 uapsd = true;
1235                         break;
1236                 case 0: /* AC_BE */
1237                 default:
1238                         queue = 2;
1239                         if (acm)
1240                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1241                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1242                                 uapsd = true;
1243                         break;
1244                 }
1245
1246                 params.aifs = pos[0] & 0x0f;
1247                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1248                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1249                 params.txop = get_unaligned_le16(pos + 2);
1250                 params.uapsd = uapsd;
1251
1252 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1253                 wiphy_debug(local->hw.wiphy,
1254                             "WMM queue=%d aci=%d acm=%d aifs=%d "
1255                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1256                             queue, aci, acm,
1257                             params.aifs, params.cw_min, params.cw_max,
1258                             params.txop, params.uapsd);
1259 #endif
1260                 sdata->tx_conf[queue] = params;
1261                 if (drv_conf_tx(local, sdata, queue, &params))
1262                         wiphy_debug(local->hw.wiphy,
1263                                     "failed to set TX queue parameters for queue %d\n",
1264                                     queue);
1265         }
1266
1267         /* enable WMM or activate new settings */
1268         sdata->vif.bss_conf.qos = true;
1269 }
1270
1271 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1272                                            u16 capab, bool erp_valid, u8 erp)
1273 {
1274         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1275         u32 changed = 0;
1276         bool use_protection;
1277         bool use_short_preamble;
1278         bool use_short_slot;
1279
1280         if (erp_valid) {
1281                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1282                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1283         } else {
1284                 use_protection = false;
1285                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1286         }
1287
1288         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1289         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1290                 use_short_slot = true;
1291
1292         if (use_protection != bss_conf->use_cts_prot) {
1293                 bss_conf->use_cts_prot = use_protection;
1294                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1295         }
1296
1297         if (use_short_preamble != bss_conf->use_short_preamble) {
1298                 bss_conf->use_short_preamble = use_short_preamble;
1299                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1300         }
1301
1302         if (use_short_slot != bss_conf->use_short_slot) {
1303                 bss_conf->use_short_slot = use_short_slot;
1304                 changed |= BSS_CHANGED_ERP_SLOT;
1305         }
1306
1307         return changed;
1308 }
1309
1310 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1311                                      struct cfg80211_bss *cbss,
1312                                      u32 bss_info_changed)
1313 {
1314         struct ieee80211_bss *bss = (void *)cbss->priv;
1315         struct ieee80211_local *local = sdata->local;
1316         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1317
1318         bss_info_changed |= BSS_CHANGED_ASSOC;
1319         /* set timing information */
1320         bss_conf->beacon_int = cbss->beacon_interval;
1321         bss_conf->last_tsf = cbss->tsf;
1322
1323         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1324         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1325                 cbss->capability, bss->has_erp_value, bss->erp_value);
1326
1327         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1328                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1329
1330         sdata->u.mgd.associated = cbss;
1331         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1332
1333         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1334
1335         /* just to be sure */
1336         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1337                                 IEEE80211_STA_BEACON_POLL);
1338
1339         ieee80211_led_assoc(local, 1);
1340
1341         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1342                 bss_conf->dtim_period = bss->dtim_period;
1343         else
1344                 bss_conf->dtim_period = 0;
1345
1346         bss_conf->assoc = 1;
1347
1348         /* Tell the driver to monitor connection quality (if supported) */
1349         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1350             bss_conf->cqm_rssi_thold)
1351                 bss_info_changed |= BSS_CHANGED_CQM;
1352
1353         /* Enable ARP filtering */
1354         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1355                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1356                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1357         }
1358
1359         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1360
1361         mutex_lock(&local->iflist_mtx);
1362         ieee80211_recalc_ps(local, -1);
1363         ieee80211_recalc_smps(local);
1364         mutex_unlock(&local->iflist_mtx);
1365
1366         netif_tx_start_all_queues(sdata->dev);
1367         netif_carrier_on(sdata->dev);
1368 }
1369
1370 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1371                                    u16 stype, u16 reason, bool tx,
1372                                    u8 *frame_buf)
1373 {
1374         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1375         struct ieee80211_local *local = sdata->local;
1376         struct sta_info *sta;
1377         u32 changed = 0;
1378         u8 bssid[ETH_ALEN];
1379
1380         ASSERT_MGD_MTX(ifmgd);
1381
1382         if (WARN_ON_ONCE(tx && !frame_buf))
1383                 return;
1384
1385         if (WARN_ON(!ifmgd->associated))
1386                 return;
1387
1388         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1389
1390         ifmgd->associated = NULL;
1391         memset(ifmgd->bssid, 0, ETH_ALEN);
1392
1393         /*
1394          * we need to commit the associated = NULL change because the
1395          * scan code uses that to determine whether this iface should
1396          * go to/wake up from powersave or not -- and could otherwise
1397          * wake the queues erroneously.
1398          */
1399         smp_mb();
1400
1401         /*
1402          * Thus, we can only afterwards stop the queues -- to account
1403          * for the case where another CPU is finishing a scan at this
1404          * time -- we don't want the scan code to enable queues.
1405          */
1406
1407         netif_tx_stop_all_queues(sdata->dev);
1408         netif_carrier_off(sdata->dev);
1409
1410         mutex_lock(&local->sta_mtx);
1411         sta = sta_info_get(sdata, bssid);
1412         if (sta) {
1413                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1414                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1415         }
1416         mutex_unlock(&local->sta_mtx);
1417
1418         /* deauthenticate/disassociate now */
1419         if (tx || frame_buf)
1420                 ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason,
1421                                                tx, frame_buf);
1422
1423         /* flush out frame */
1424         if (tx)
1425                 drv_flush(local, false);
1426
1427         /* remove AP and TDLS peers */
1428         sta_info_flush(local, sdata);
1429
1430         /* finally reset all BSS / config parameters */
1431         changed |= ieee80211_reset_erp_info(sdata);
1432
1433         ieee80211_led_assoc(local, 0);
1434         changed |= BSS_CHANGED_ASSOC;
1435         sdata->vif.bss_conf.assoc = false;
1436
1437         /* on the next assoc, re-program HT parameters */
1438         sdata->ht_opmode_valid = false;
1439         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1440         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1441
1442         local->power_constr_level = 0;
1443
1444         del_timer_sync(&local->dynamic_ps_timer);
1445         cancel_work_sync(&local->dynamic_ps_enable_work);
1446
1447         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1448                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1449                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1450         }
1451         local->ps_sdata = NULL;
1452
1453         /* Disable ARP filtering */
1454         if (sdata->vif.bss_conf.arp_filter_enabled) {
1455                 sdata->vif.bss_conf.arp_filter_enabled = false;
1456                 changed |= BSS_CHANGED_ARP_FILTER;
1457         }
1458
1459         sdata->vif.bss_conf.qos = false;
1460         changed |= BSS_CHANGED_QOS;
1461
1462         /* The BSSID (not really interesting) and HT changed */
1463         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1464         ieee80211_bss_info_change_notify(sdata, changed);
1465
1466         /* channel(_type) changes are handled by ieee80211_hw_config */
1467         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1468         ieee80211_hw_config(local, 0);
1469
1470         /* disassociated - set to defaults now */
1471         ieee80211_set_wmm_default(sdata, false);
1472
1473         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1474         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1475         del_timer_sync(&sdata->u.mgd.timer);
1476         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1477 }
1478
1479 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1480                              struct ieee80211_hdr *hdr)
1481 {
1482         /*
1483          * We can postpone the mgd.timer whenever receiving unicast frames
1484          * from AP because we know that the connection is working both ways
1485          * at that time. But multicast frames (and hence also beacons) must
1486          * be ignored here, because we need to trigger the timer during
1487          * data idle periods for sending the periodic probe request to the
1488          * AP we're connected to.
1489          */
1490         if (is_multicast_ether_addr(hdr->addr1))
1491                 return;
1492
1493         ieee80211_sta_reset_conn_monitor(sdata);
1494 }
1495
1496 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1497 {
1498         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1499
1500         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1501                               IEEE80211_STA_CONNECTION_POLL)))
1502             return;
1503
1504         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1505                           IEEE80211_STA_BEACON_POLL);
1506         mutex_lock(&sdata->local->iflist_mtx);
1507         ieee80211_recalc_ps(sdata->local, -1);
1508         mutex_unlock(&sdata->local->iflist_mtx);
1509
1510         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1511                 return;
1512
1513         /*
1514          * We've received a probe response, but are not sure whether
1515          * we have or will be receiving any beacons or data, so let's
1516          * schedule the timers again, just in case.
1517          */
1518         ieee80211_sta_reset_beacon_monitor(sdata);
1519
1520         mod_timer(&ifmgd->conn_mon_timer,
1521                   round_jiffies_up(jiffies +
1522                                    IEEE80211_CONNECTION_IDLE_TIME));
1523 }
1524
1525 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1526                              struct ieee80211_hdr *hdr, bool ack)
1527 {
1528         if (!ieee80211_is_data(hdr->frame_control))
1529             return;
1530
1531         if (ack)
1532                 ieee80211_sta_reset_conn_monitor(sdata);
1533
1534         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1535             sdata->u.mgd.probe_send_count > 0) {
1536                 if (ack)
1537                         sdata->u.mgd.probe_send_count = 0;
1538                 else
1539                         sdata->u.mgd.nullfunc_failed = true;
1540                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1541         }
1542 }
1543
1544 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1545 {
1546         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1547         const u8 *ssid;
1548         u8 *dst = ifmgd->associated->bssid;
1549         u8 unicast_limit = max(1, max_probe_tries - 3);
1550
1551         /*
1552          * Try sending broadcast probe requests for the last three
1553          * probe requests after the first ones failed since some
1554          * buggy APs only support broadcast probe requests.
1555          */
1556         if (ifmgd->probe_send_count >= unicast_limit)
1557                 dst = NULL;
1558
1559         /*
1560          * When the hardware reports an accurate Tx ACK status, it's
1561          * better to send a nullfunc frame instead of a probe request,
1562          * as it will kick us off the AP quickly if we aren't associated
1563          * anymore. The timeout will be reset if the frame is ACKed by
1564          * the AP.
1565          */
1566         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1567                 ifmgd->nullfunc_failed = false;
1568                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1569         } else {
1570                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1571                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1572                                          (u32) -1, true, false);
1573         }
1574
1575         ifmgd->probe_send_count++;
1576         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1577         run_again(ifmgd, ifmgd->probe_timeout);
1578 }
1579
1580 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1581                                    bool beacon)
1582 {
1583         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1584         bool already = false;
1585
1586         if (!ieee80211_sdata_running(sdata))
1587                 return;
1588
1589         if (sdata->local->scanning)
1590                 return;
1591
1592         if (sdata->local->tmp_channel)
1593                 return;
1594
1595         mutex_lock(&ifmgd->mtx);
1596
1597         if (!ifmgd->associated)
1598                 goto out;
1599
1600 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1601         if (beacon && net_ratelimit())
1602                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1603                        "- sending probe request\n", sdata->name);
1604 #endif
1605
1606         /*
1607          * The driver/our work has already reported this event or the
1608          * connection monitoring has kicked in and we have already sent
1609          * a probe request. Or maybe the AP died and the driver keeps
1610          * reporting until we disassociate...
1611          *
1612          * In either case we have to ignore the current call to this
1613          * function (except for setting the correct probe reason bit)
1614          * because otherwise we would reset the timer every time and
1615          * never check whether we received a probe response!
1616          */
1617         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1618                             IEEE80211_STA_CONNECTION_POLL))
1619                 already = true;
1620
1621         if (beacon)
1622                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1623         else
1624                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1625
1626         if (already)
1627                 goto out;
1628
1629         mutex_lock(&sdata->local->iflist_mtx);
1630         ieee80211_recalc_ps(sdata->local, -1);
1631         mutex_unlock(&sdata->local->iflist_mtx);
1632
1633         ifmgd->probe_send_count = 0;
1634         ieee80211_mgd_probe_ap_send(sdata);
1635  out:
1636         mutex_unlock(&ifmgd->mtx);
1637 }
1638
1639 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1640                                           struct ieee80211_vif *vif)
1641 {
1642         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1643         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1644         struct sk_buff *skb;
1645         const u8 *ssid;
1646
1647         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1648                 return NULL;
1649
1650         ASSERT_MGD_MTX(ifmgd);
1651
1652         if (!ifmgd->associated)
1653                 return NULL;
1654
1655         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1656         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1657                                         (u32) -1, ssid + 2, ssid[1],
1658                                         NULL, 0, true);
1659
1660         return skb;
1661 }
1662 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1663
1664 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1665 {
1666         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1667         struct ieee80211_local *local = sdata->local;
1668         u8 bssid[ETH_ALEN];
1669         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1670
1671         mutex_lock(&ifmgd->mtx);
1672         if (!ifmgd->associated) {
1673                 mutex_unlock(&ifmgd->mtx);
1674                 return;
1675         }
1676
1677         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1678
1679         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1680                sdata->name, bssid);
1681
1682         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1683                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1684                                false, frame_buf);
1685         mutex_unlock(&ifmgd->mtx);
1686
1687         /*
1688          * must be outside lock due to cfg80211,
1689          * but that's not a problem.
1690          */
1691         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1692
1693         mutex_lock(&local->mtx);
1694         ieee80211_recalc_idle(local);
1695         mutex_unlock(&local->mtx);
1696 }
1697
1698 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1699 {
1700         struct ieee80211_sub_if_data *sdata =
1701                 container_of(work, struct ieee80211_sub_if_data,
1702                              u.mgd.beacon_connection_loss_work);
1703         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1704         struct sta_info *sta;
1705
1706         if (ifmgd->associated) {
1707                 rcu_read_lock();
1708                 sta = sta_info_get(sdata, ifmgd->bssid);
1709                 if (sta)
1710                         sta->beacon_loss_count++;
1711                 rcu_read_unlock();
1712         }
1713
1714         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1715                 __ieee80211_connection_loss(sdata);
1716         else
1717                 ieee80211_mgd_probe_ap(sdata, true);
1718 }
1719
1720 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1721 {
1722         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1723         struct ieee80211_hw *hw = &sdata->local->hw;
1724
1725         trace_api_beacon_loss(sdata);
1726
1727         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1728         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1729 }
1730 EXPORT_SYMBOL(ieee80211_beacon_loss);
1731
1732 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1733 {
1734         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1735         struct ieee80211_hw *hw = &sdata->local->hw;
1736
1737         trace_api_connection_loss(sdata);
1738
1739         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1740         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1741 }
1742 EXPORT_SYMBOL(ieee80211_connection_loss);
1743
1744
1745 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1746                                         bool assoc)
1747 {
1748         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1749
1750         lockdep_assert_held(&sdata->u.mgd.mtx);
1751
1752         if (!assoc) {
1753                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1754
1755                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1756                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1757         }
1758
1759         cfg80211_put_bss(auth_data->bss);
1760         kfree(auth_data);
1761         sdata->u.mgd.auth_data = NULL;
1762 }
1763
1764 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1765                                      struct ieee80211_mgmt *mgmt, size_t len)
1766 {
1767         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1768         u8 *pos;
1769         struct ieee802_11_elems elems;
1770
1771         pos = mgmt->u.auth.variable;
1772         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1773         if (!elems.challenge)
1774                 return;
1775         auth_data->expected_transaction = 4;
1776         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1777                             elems.challenge - 2, elems.challenge_len + 2,
1778                             auth_data->bss->bssid, auth_data->bss->bssid,
1779                             auth_data->key, auth_data->key_len,
1780                             auth_data->key_idx);
1781 }
1782
1783 static enum rx_mgmt_action __must_check
1784 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1785                        struct ieee80211_mgmt *mgmt, size_t len)
1786 {
1787         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1788         u8 bssid[ETH_ALEN];
1789         u16 auth_alg, auth_transaction, status_code;
1790         struct sta_info *sta;
1791
1792         lockdep_assert_held(&ifmgd->mtx);
1793
1794         if (len < 24 + 6)
1795                 return RX_MGMT_NONE;
1796
1797         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1798                 return RX_MGMT_NONE;
1799
1800         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1801
1802         if (compare_ether_addr(bssid, mgmt->bssid))
1803                 return RX_MGMT_NONE;
1804
1805         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1806         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1807         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1808
1809         if (auth_alg != ifmgd->auth_data->algorithm ||
1810             auth_transaction != ifmgd->auth_data->expected_transaction)
1811                 return RX_MGMT_NONE;
1812
1813         if (status_code != WLAN_STATUS_SUCCESS) {
1814                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
1815                        sdata->name, mgmt->sa, status_code);
1816                 goto out;
1817         }
1818
1819         switch (ifmgd->auth_data->algorithm) {
1820         case WLAN_AUTH_OPEN:
1821         case WLAN_AUTH_LEAP:
1822         case WLAN_AUTH_FT:
1823                 break;
1824         case WLAN_AUTH_SHARED_KEY:
1825                 if (ifmgd->auth_data->expected_transaction != 4) {
1826                         ieee80211_auth_challenge(sdata, mgmt, len);
1827                         /* need another frame */
1828                         return RX_MGMT_NONE;
1829                 }
1830                 break;
1831         default:
1832                 WARN_ONCE(1, "invalid auth alg %d",
1833                           ifmgd->auth_data->algorithm);
1834                 return RX_MGMT_NONE;
1835         }
1836
1837         printk(KERN_DEBUG "%s: authenticated\n", sdata->name);
1838  out:
1839         ifmgd->auth_data->done = true;
1840         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1841         run_again(ifmgd, ifmgd->auth_data->timeout);
1842
1843         /* move station state to auth */
1844         mutex_lock(&sdata->local->sta_mtx);
1845         sta = sta_info_get(sdata, bssid);
1846         if (!sta) {
1847                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1848                 goto out_err;
1849         }
1850         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1851                 printk(KERN_DEBUG "%s: failed moving %pM to auth\n",
1852                        sdata->name, bssid);
1853                 goto out_err;
1854         }
1855         mutex_unlock(&sdata->local->sta_mtx);
1856
1857         return RX_MGMT_CFG80211_RX_AUTH;
1858  out_err:
1859         mutex_unlock(&sdata->local->sta_mtx);
1860         /* ignore frame -- wait for timeout */
1861         return RX_MGMT_NONE;
1862 }
1863
1864
1865 static enum rx_mgmt_action __must_check
1866 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1867                          struct ieee80211_mgmt *mgmt, size_t len)
1868 {
1869         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1870         const u8 *bssid = NULL;
1871         u16 reason_code;
1872
1873         lockdep_assert_held(&ifmgd->mtx);
1874
1875         if (len < 24 + 2)
1876                 return RX_MGMT_NONE;
1877
1878         if (!ifmgd->associated ||
1879             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1880                 return RX_MGMT_NONE;
1881
1882         bssid = ifmgd->associated->bssid;
1883
1884         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1885
1886         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1887                         sdata->name, bssid, reason_code);
1888
1889         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1890
1891         mutex_lock(&sdata->local->mtx);
1892         ieee80211_recalc_idle(sdata->local);
1893         mutex_unlock(&sdata->local->mtx);
1894
1895         return RX_MGMT_CFG80211_DEAUTH;
1896 }
1897
1898
1899 static enum rx_mgmt_action __must_check
1900 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1901                            struct ieee80211_mgmt *mgmt, size_t len)
1902 {
1903         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1904         u16 reason_code;
1905
1906         lockdep_assert_held(&ifmgd->mtx);
1907
1908         if (len < 24 + 2)
1909                 return RX_MGMT_NONE;
1910
1911         if (!ifmgd->associated ||
1912             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1913                 return RX_MGMT_NONE;
1914
1915         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1916
1917         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1918                         sdata->name, mgmt->sa, reason_code);
1919
1920         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1921
1922         mutex_lock(&sdata->local->mtx);
1923         ieee80211_recalc_idle(sdata->local);
1924         mutex_unlock(&sdata->local->mtx);
1925
1926         return RX_MGMT_CFG80211_DISASSOC;
1927 }
1928
1929 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1930                                 u8 *supp_rates, unsigned int supp_rates_len,
1931                                 u32 *rates, u32 *basic_rates,
1932                                 bool *have_higher_than_11mbit,
1933                                 int *min_rate, int *min_rate_index)
1934 {
1935         int i, j;
1936
1937         for (i = 0; i < supp_rates_len; i++) {
1938                 int rate = (supp_rates[i] & 0x7f) * 5;
1939                 bool is_basic = !!(supp_rates[i] & 0x80);
1940
1941                 if (rate > 110)
1942                         *have_higher_than_11mbit = true;
1943
1944                 /*
1945                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1946                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1947                  *
1948                  * Note: Even through the membership selector and the basic
1949                  *       rate flag share the same bit, they are not exactly
1950                  *       the same.
1951                  */
1952                 if (!!(supp_rates[i] & 0x80) &&
1953                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1954                         continue;
1955
1956                 for (j = 0; j < sband->n_bitrates; j++) {
1957                         if (sband->bitrates[j].bitrate == rate) {
1958                                 *rates |= BIT(j);
1959                                 if (is_basic)
1960                                         *basic_rates |= BIT(j);
1961                                 if (rate < *min_rate) {
1962                                         *min_rate = rate;
1963                                         *min_rate_index = j;
1964                                 }
1965                                 break;
1966                         }
1967                 }
1968         }
1969 }
1970
1971 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1972                                          bool assoc)
1973 {
1974         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1975
1976         lockdep_assert_held(&sdata->u.mgd.mtx);
1977
1978         if (!assoc) {
1979                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1980
1981                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1982                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1983         }
1984
1985         kfree(assoc_data);
1986         sdata->u.mgd.assoc_data = NULL;
1987 }
1988
1989 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1990                                     struct cfg80211_bss *cbss,
1991                                     struct ieee80211_mgmt *mgmt, size_t len)
1992 {
1993         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1994         struct ieee80211_local *local = sdata->local;
1995         struct ieee80211_supported_band *sband;
1996         struct sta_info *sta;
1997         u8 *pos;
1998         u16 capab_info, aid;
1999         struct ieee802_11_elems elems;
2000         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2001         u32 changed = 0;
2002         int err;
2003         u16 ap_ht_cap_flags;
2004
2005         /* AssocResp and ReassocResp have identical structure */
2006
2007         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2008         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2009
2010         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2011                 printk(KERN_DEBUG
2012                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
2013                        sdata->name, aid);
2014         aid &= ~(BIT(15) | BIT(14));
2015
2016         ifmgd->broken_ap = false;
2017
2018         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2019                 printk(KERN_DEBUG
2020                        "%s: invalid AID value %d (out of range), turn off PS\n",
2021                        sdata->name, aid);
2022                 aid = 0;
2023                 ifmgd->broken_ap = true;
2024         }
2025
2026         pos = mgmt->u.assoc_resp.variable;
2027         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2028
2029         if (!elems.supp_rates) {
2030                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2031                        sdata->name);
2032                 return false;
2033         }
2034
2035         ifmgd->aid = aid;
2036
2037         mutex_lock(&sdata->local->sta_mtx);
2038         /*
2039          * station info was already allocated and inserted before
2040          * the association and should be available to us
2041          */
2042         sta = sta_info_get(sdata, cbss->bssid);
2043         if (WARN_ON(!sta)) {
2044                 mutex_unlock(&sdata->local->sta_mtx);
2045                 return false;
2046         }
2047
2048         sband = local->hw.wiphy->bands[local->oper_channel->band];
2049
2050         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2051                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2052                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2053
2054         ap_ht_cap_flags = sta->sta.ht_cap.cap;
2055
2056         rate_control_rate_init(sta);
2057
2058         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2059                 set_sta_flag(sta, WLAN_STA_MFP);
2060
2061         if (elems.wmm_param)
2062                 set_sta_flag(sta, WLAN_STA_WME);
2063
2064         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2065         if (!err)
2066                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2067         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2068                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2069         if (err) {
2070                 printk(KERN_DEBUG
2071                        "%s: failed to move station %pM to desired state\n",
2072                        sdata->name, sta->sta.addr);
2073                 WARN_ON(__sta_info_destroy(sta));
2074                 mutex_unlock(&sdata->local->sta_mtx);
2075                 return false;
2076         }
2077
2078         mutex_unlock(&sdata->local->sta_mtx);
2079
2080         /*
2081          * Always handle WMM once after association regardless
2082          * of the first value the AP uses. Setting -1 here has
2083          * that effect because the AP values is an unsigned
2084          * 4-bit value.
2085          */
2086         ifmgd->wmm_last_param_set = -1;
2087
2088         if (elems.wmm_param)
2089                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2090                                          elems.wmm_param_len);
2091         else
2092                 ieee80211_set_wmm_default(sdata, false);
2093         changed |= BSS_CHANGED_QOS;
2094
2095         if (elems.ht_info_elem && elems.wmm_param &&
2096             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2097                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2098                                                cbss->bssid, ap_ht_cap_flags,
2099                                                false);
2100
2101         /* set AID and assoc capability,
2102          * ieee80211_set_associated() will tell the driver */
2103         bss_conf->aid = aid;
2104         bss_conf->assoc_capability = capab_info;
2105         ieee80211_set_associated(sdata, cbss, changed);
2106
2107         /*
2108          * If we're using 4-addr mode, let the AP know that we're
2109          * doing so, so that it can create the STA VLAN on its side
2110          */
2111         if (ifmgd->use_4addr)
2112                 ieee80211_send_4addr_nullfunc(local, sdata);
2113
2114         /*
2115          * Start timer to probe the connection to the AP now.
2116          * Also start the timer that will detect beacon loss.
2117          */
2118         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2119         ieee80211_sta_reset_beacon_monitor(sdata);
2120
2121         return true;
2122 }
2123
2124 static enum rx_mgmt_action __must_check
2125 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2126                              struct ieee80211_mgmt *mgmt, size_t len,
2127                              struct cfg80211_bss **bss)
2128 {
2129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2130         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2131         u16 capab_info, status_code, aid;
2132         struct ieee802_11_elems elems;
2133         u8 *pos;
2134         bool reassoc;
2135
2136         lockdep_assert_held(&ifmgd->mtx);
2137
2138         if (!assoc_data)
2139                 return RX_MGMT_NONE;
2140         if (compare_ether_addr(assoc_data->bss->bssid, mgmt->bssid))
2141                 return RX_MGMT_NONE;
2142
2143         /*
2144          * AssocResp and ReassocResp have identical structure, so process both
2145          * of them in this function.
2146          */
2147
2148         if (len < 24 + 6)
2149                 return RX_MGMT_NONE;
2150
2151         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2152         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2153         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2154         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2155
2156         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
2157                "status=%d aid=%d)\n",
2158                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
2159                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2160
2161         pos = mgmt->u.assoc_resp.variable;
2162         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2163
2164         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2165             elems.timeout_int && elems.timeout_int_len == 5 &&
2166             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2167                 u32 tu, ms;
2168                 tu = get_unaligned_le32(elems.timeout_int + 1);
2169                 ms = tu * 1024 / 1000;
2170                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
2171                        "comeback duration %u TU (%u ms)\n",
2172                        sdata->name, mgmt->sa, tu, ms);
2173                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2174                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2175                         run_again(ifmgd, assoc_data->timeout);
2176                 return RX_MGMT_NONE;
2177         }
2178
2179         *bss = assoc_data->bss;
2180
2181         if (status_code != WLAN_STATUS_SUCCESS) {
2182                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
2183                        sdata->name, mgmt->sa, status_code);
2184                 ieee80211_destroy_assoc_data(sdata, false);
2185         } else {
2186                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
2187
2188                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2189                         /* oops -- internal error -- send timeout for now */
2190                         ieee80211_destroy_assoc_data(sdata, true);
2191                         sta_info_destroy_addr(sdata, mgmt->bssid);
2192                         cfg80211_put_bss(*bss);
2193                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2194                 }
2195
2196                 /*
2197                  * destroy assoc_data afterwards, as otherwise an idle
2198                  * recalc after assoc_data is NULL but before associated
2199                  * is set can cause the interface to go idle
2200                  */
2201                 ieee80211_destroy_assoc_data(sdata, true);
2202         }
2203
2204         return RX_MGMT_CFG80211_RX_ASSOC;
2205 }
2206 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2207                                   struct ieee80211_mgmt *mgmt,
2208                                   size_t len,
2209                                   struct ieee80211_rx_status *rx_status,
2210                                   struct ieee802_11_elems *elems,
2211                                   bool beacon)
2212 {
2213         struct ieee80211_local *local = sdata->local;
2214         int freq;
2215         struct ieee80211_bss *bss;
2216         struct ieee80211_channel *channel;
2217         bool need_ps = false;
2218
2219         if (sdata->u.mgd.associated &&
2220             compare_ether_addr(mgmt->bssid, sdata->u.mgd.associated->bssid)
2221             == 0) {
2222                 bss = (void *)sdata->u.mgd.associated->priv;
2223                 /* not previously set so we may need to recalc */
2224                 need_ps = !bss->dtim_period;
2225         }
2226
2227         if (elems->ds_params && elems->ds_params_len == 1)
2228                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2229                                                       rx_status->band);
2230         else
2231                 freq = rx_status->freq;
2232
2233         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2234
2235         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2236                 return;
2237
2238         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2239                                         channel, beacon);
2240         if (bss)
2241                 ieee80211_rx_bss_put(local, bss);
2242
2243         if (!sdata->u.mgd.associated)
2244                 return;
2245
2246         if (need_ps) {
2247                 mutex_lock(&local->iflist_mtx);
2248                 ieee80211_recalc_ps(local, -1);
2249                 mutex_unlock(&local->iflist_mtx);
2250         }
2251
2252         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2253             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2254                                                         ETH_ALEN) == 0)) {
2255                 struct ieee80211_channel_sw_ie *sw_elem =
2256                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2257                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2258                                                  bss, rx_status->mactime);
2259         }
2260 }
2261
2262
2263 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2264                                          struct sk_buff *skb)
2265 {
2266         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2267         struct ieee80211_if_managed *ifmgd;
2268         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2269         size_t baselen, len = skb->len;
2270         struct ieee802_11_elems elems;
2271
2272         ifmgd = &sdata->u.mgd;
2273
2274         ASSERT_MGD_MTX(ifmgd);
2275
2276         if (compare_ether_addr(mgmt->da, sdata->vif.addr))
2277                 return; /* ignore ProbeResp to foreign address */
2278
2279         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2280         if (baselen > len)
2281                 return;
2282
2283         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2284                                 &elems);
2285
2286         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2287
2288         if (ifmgd->associated &&
2289             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid) == 0)
2290                 ieee80211_reset_ap_probe(sdata);
2291
2292         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2293             compare_ether_addr(mgmt->bssid, ifmgd->auth_data->bss->bssid)
2294             == 0) {
2295                 /* got probe response, continue with auth */
2296                 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
2297                 ifmgd->auth_data->tries = 0;
2298                 ifmgd->auth_data->timeout = jiffies;
2299                 run_again(ifmgd, ifmgd->auth_data->timeout);
2300         }
2301 }
2302
2303 /*
2304  * This is the canonical list of information elements we care about,
2305  * the filter code also gives us all changes to the Microsoft OUI
2306  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2307  *
2308  * We implement beacon filtering in software since that means we can
2309  * avoid processing the frame here and in cfg80211, and userspace
2310  * will not be able to tell whether the hardware supports it or not.
2311  *
2312  * XXX: This list needs to be dynamic -- userspace needs to be able to
2313  *      add items it requires. It also needs to be able to tell us to
2314  *      look out for other vendor IEs.
2315  */
2316 static const u64 care_about_ies =
2317         (1ULL << WLAN_EID_COUNTRY) |
2318         (1ULL << WLAN_EID_ERP_INFO) |
2319         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2320         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2321         (1ULL << WLAN_EID_HT_CAPABILITY) |
2322         (1ULL << WLAN_EID_HT_INFORMATION);
2323
2324 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2325                                      struct ieee80211_mgmt *mgmt,
2326                                      size_t len,
2327                                      struct ieee80211_rx_status *rx_status)
2328 {
2329         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2330         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2331         size_t baselen;
2332         struct ieee802_11_elems elems;
2333         struct ieee80211_local *local = sdata->local;
2334         u32 changed = 0;
2335         bool erp_valid, directed_tim = false;
2336         u8 erp_value = 0;
2337         u32 ncrc;
2338         u8 *bssid;
2339
2340         lockdep_assert_held(&ifmgd->mtx);
2341
2342         /* Process beacon from the current BSS */
2343         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2344         if (baselen > len)
2345                 return;
2346
2347         if (rx_status->freq != local->hw.conf.channel->center_freq)
2348                 return;
2349
2350         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2351             compare_ether_addr(mgmt->bssid, ifmgd->assoc_data->bss->bssid)
2352             == 0) {
2353                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2354                                        len - baselen, &elems);
2355
2356                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2357                                       false);
2358                 ifmgd->assoc_data->have_beacon = true;
2359                 ifmgd->assoc_data->sent_assoc = false;
2360                 /* continue assoc process */
2361                 ifmgd->assoc_data->timeout = jiffies;
2362                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2363                 return;
2364         }
2365
2366         if (!ifmgd->associated ||
2367             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
2368                 return;
2369         bssid = ifmgd->associated->bssid;
2370
2371         /* Track average RSSI from the Beacon frames of the current AP */
2372         ifmgd->last_beacon_signal = rx_status->signal;
2373         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2374                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2375                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2376                 ifmgd->last_cqm_event_signal = 0;
2377                 ifmgd->count_beacon_signal = 1;
2378                 ifmgd->last_ave_beacon_signal = 0;
2379         } else {
2380                 ifmgd->ave_beacon_signal =
2381                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2382                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2383                          ifmgd->ave_beacon_signal) / 16;
2384                 ifmgd->count_beacon_signal++;
2385         }
2386
2387         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2388             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2389                 int sig = ifmgd->ave_beacon_signal;
2390                 int last_sig = ifmgd->last_ave_beacon_signal;
2391
2392                 /*
2393                  * if signal crosses either of the boundaries, invoke callback
2394                  * with appropriate parameters
2395                  */
2396                 if (sig > ifmgd->rssi_max_thold &&
2397                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2398                         ifmgd->last_ave_beacon_signal = sig;
2399                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2400                 } else if (sig < ifmgd->rssi_min_thold &&
2401                            (last_sig >= ifmgd->rssi_max_thold ||
2402                            last_sig == 0)) {
2403                         ifmgd->last_ave_beacon_signal = sig;
2404                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2405                 }
2406         }
2407
2408         if (bss_conf->cqm_rssi_thold &&
2409             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2410             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2411                 int sig = ifmgd->ave_beacon_signal / 16;
2412                 int last_event = ifmgd->last_cqm_event_signal;
2413                 int thold = bss_conf->cqm_rssi_thold;
2414                 int hyst = bss_conf->cqm_rssi_hyst;
2415                 if (sig < thold &&
2416                     (last_event == 0 || sig < last_event - hyst)) {
2417                         ifmgd->last_cqm_event_signal = sig;
2418                         ieee80211_cqm_rssi_notify(
2419                                 &sdata->vif,
2420                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2421                                 GFP_KERNEL);
2422                 } else if (sig > thold &&
2423                            (last_event == 0 || sig > last_event + hyst)) {
2424                         ifmgd->last_cqm_event_signal = sig;
2425                         ieee80211_cqm_rssi_notify(
2426                                 &sdata->vif,
2427                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2428                                 GFP_KERNEL);
2429                 }
2430         }
2431
2432         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2433 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2434                 if (net_ratelimit()) {
2435                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
2436                                "to a received beacon\n", sdata->name);
2437                 }
2438 #endif
2439                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2440                 mutex_lock(&local->iflist_mtx);
2441                 ieee80211_recalc_ps(local, -1);
2442                 mutex_unlock(&local->iflist_mtx);
2443         }
2444
2445         /*
2446          * Push the beacon loss detection into the future since
2447          * we are processing a beacon from the AP just now.
2448          */
2449         ieee80211_sta_reset_beacon_monitor(sdata);
2450
2451         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2452         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2453                                           len - baselen, &elems,
2454                                           care_about_ies, ncrc);
2455
2456         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2457                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2458                                                    ifmgd->aid);
2459
2460         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
2461                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2462                                       true);
2463
2464                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2465                                          elems.wmm_param_len);
2466         }
2467
2468         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2469                 if (directed_tim) {
2470                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2471                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2472                                 ieee80211_hw_config(local,
2473                                                     IEEE80211_CONF_CHANGE_PS);
2474                                 ieee80211_send_nullfunc(local, sdata, 0);
2475                         } else {
2476                                 local->pspolling = true;
2477
2478                                 /*
2479                                  * Here is assumed that the driver will be
2480                                  * able to send ps-poll frame and receive a
2481                                  * response even though power save mode is
2482                                  * enabled, but some drivers might require
2483                                  * to disable power save here. This needs
2484                                  * to be investigated.
2485                                  */
2486                                 ieee80211_send_pspoll(local, sdata);
2487                         }
2488                 }
2489         }
2490
2491         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2492                 return;
2493         ifmgd->beacon_crc = ncrc;
2494         ifmgd->beacon_crc_valid = true;
2495
2496         if (elems.erp_info && elems.erp_info_len >= 1) {
2497                 erp_valid = true;
2498                 erp_value = elems.erp_info[0];
2499         } else {
2500                 erp_valid = false;
2501         }
2502         changed |= ieee80211_handle_bss_capability(sdata,
2503                         le16_to_cpu(mgmt->u.beacon.capab_info),
2504                         erp_valid, erp_value);
2505
2506
2507         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2508             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2509                 struct sta_info *sta;
2510                 struct ieee80211_supported_band *sband;
2511                 u16 ap_ht_cap_flags;
2512
2513                 rcu_read_lock();
2514
2515                 sta = sta_info_get(sdata, bssid);
2516                 if (WARN_ON(!sta)) {
2517                         rcu_read_unlock();
2518                         return;
2519                 }
2520
2521                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2522
2523                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2524                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2525
2526                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
2527
2528                 rcu_read_unlock();
2529
2530                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2531                                                bssid, ap_ht_cap_flags, true);
2532         }
2533
2534         /* Note: country IE parsing is done for us by cfg80211 */
2535         if (elems.country_elem) {
2536                 /* TODO: IBSS also needs this */
2537                 if (elems.pwr_constr_elem)
2538                         ieee80211_handle_pwr_constr(sdata,
2539                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2540                                 elems.pwr_constr_elem,
2541                                 elems.pwr_constr_elem_len);
2542         }
2543
2544         ieee80211_bss_info_change_notify(sdata, changed);
2545 }
2546
2547 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2548                                   struct sk_buff *skb)
2549 {
2550         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2551         struct ieee80211_rx_status *rx_status;
2552         struct ieee80211_mgmt *mgmt;
2553         struct cfg80211_bss *bss = NULL;
2554         enum rx_mgmt_action rma = RX_MGMT_NONE;
2555         u16 fc;
2556
2557         rx_status = (struct ieee80211_rx_status *) skb->cb;
2558         mgmt = (struct ieee80211_mgmt *) skb->data;
2559         fc = le16_to_cpu(mgmt->frame_control);
2560
2561         mutex_lock(&ifmgd->mtx);
2562
2563         switch (fc & IEEE80211_FCTL_STYPE) {
2564         case IEEE80211_STYPE_BEACON:
2565                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2566                 break;
2567         case IEEE80211_STYPE_PROBE_RESP:
2568                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2569                 break;
2570         case IEEE80211_STYPE_AUTH:
2571                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2572                 break;
2573         case IEEE80211_STYPE_DEAUTH:
2574                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2575                 break;
2576         case IEEE80211_STYPE_DISASSOC:
2577                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2578                 break;
2579         case IEEE80211_STYPE_ASSOC_RESP:
2580         case IEEE80211_STYPE_REASSOC_RESP:
2581                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2582                 break;
2583         case IEEE80211_STYPE_ACTION:
2584                 switch (mgmt->u.action.category) {
2585                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2586                         ieee80211_sta_process_chanswitch(sdata,
2587                                         &mgmt->u.action.u.chan_switch.sw_elem,
2588                                         (void *)ifmgd->associated->priv,
2589                                         rx_status->mactime);
2590                         break;
2591                 }
2592         }
2593         mutex_unlock(&ifmgd->mtx);
2594
2595         switch (rma) {
2596         case RX_MGMT_NONE:
2597                 /* no action */
2598                 break;
2599         case RX_MGMT_CFG80211_DEAUTH:
2600                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2601                 break;
2602         case RX_MGMT_CFG80211_DISASSOC:
2603                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2604                 break;
2605         case RX_MGMT_CFG80211_RX_AUTH:
2606                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2607                 break;
2608         case RX_MGMT_CFG80211_RX_ASSOC:
2609                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2610                 break;
2611         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2612                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2613                 break;
2614         default:
2615                 WARN(1, "unexpected: %d", rma);
2616         }
2617 }
2618
2619 static void ieee80211_sta_timer(unsigned long data)
2620 {
2621         struct ieee80211_sub_if_data *sdata =
2622                 (struct ieee80211_sub_if_data *) data;
2623         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2624         struct ieee80211_local *local = sdata->local;
2625
2626         if (local->quiescing) {
2627                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2628                 return;
2629         }
2630
2631         ieee80211_queue_work(&local->hw, &sdata->work);
2632 }
2633
2634 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2635                                           u8 *bssid, u8 reason)
2636 {
2637         struct ieee80211_local *local = sdata->local;
2638         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2639         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2640
2641         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2642                           IEEE80211_STA_BEACON_POLL);
2643
2644         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2645                                false, frame_buf);
2646         mutex_unlock(&ifmgd->mtx);
2647
2648         /*
2649          * must be outside lock due to cfg80211,
2650          * but that's not a problem.
2651          */
2652         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2653
2654         mutex_lock(&local->mtx);
2655         ieee80211_recalc_idle(local);
2656         mutex_unlock(&local->mtx);
2657
2658         mutex_lock(&ifmgd->mtx);
2659 }
2660
2661 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2662 {
2663         struct ieee80211_local *local = sdata->local;
2664         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2665         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2666
2667         lockdep_assert_held(&ifmgd->mtx);
2668
2669         if (WARN_ON_ONCE(!auth_data))
2670                 return -EINVAL;
2671
2672         auth_data->tries++;
2673
2674         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2675                 printk(KERN_DEBUG "%s: authentication with %pM timed out\n",
2676                        sdata->name, auth_data->bss->bssid);
2677
2678                 /*
2679                  * Most likely AP is not in the range so remove the
2680                  * bss struct for that AP.
2681                  */
2682                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2683
2684                 return -ETIMEDOUT;
2685         }
2686
2687         if (auth_data->bss->proberesp_ies) {
2688                 printk(KERN_DEBUG "%s: send auth to %pM (try %d/%d)\n",
2689                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2690                        IEEE80211_AUTH_MAX_TRIES);
2691
2692                 auth_data->expected_transaction = 2;
2693                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2694                                     auth_data->ie, auth_data->ie_len,
2695                                     auth_data->bss->bssid,
2696                                     auth_data->bss->bssid, NULL, 0, 0);
2697         } else {
2698                 const u8 *ssidie;
2699
2700                 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
2701                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2702                        IEEE80211_AUTH_MAX_TRIES);
2703
2704                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2705                 if (!ssidie)
2706                         return -EINVAL;
2707                 /*
2708                  * Direct probe is sent to broadcast address as some APs
2709                  * will not answer to direct packet in unassociated state.
2710                  */
2711                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2712                                          NULL, 0, (u32) -1, true, false);
2713         }
2714
2715         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2716         run_again(ifmgd, auth_data->timeout);
2717
2718         return 0;
2719 }
2720
2721 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2722 {
2723         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2724         struct ieee80211_local *local = sdata->local;
2725
2726         lockdep_assert_held(&sdata->u.mgd.mtx);
2727
2728         assoc_data->tries++;
2729         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2730                 printk(KERN_DEBUG "%s: association with %pM timed out\n",
2731                        sdata->name, assoc_data->bss->bssid);
2732
2733                 /*
2734                  * Most likely AP is not in the range so remove the
2735                  * bss struct for that AP.
2736                  */
2737                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2738
2739                 return -ETIMEDOUT;
2740         }
2741
2742         printk(KERN_DEBUG "%s: associate with %pM (try %d/%d)\n",
2743                sdata->name, assoc_data->bss->bssid, assoc_data->tries,
2744                IEEE80211_ASSOC_MAX_TRIES);
2745         ieee80211_send_assoc(sdata);
2746
2747         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2748         run_again(&sdata->u.mgd, assoc_data->timeout);
2749
2750         return 0;
2751 }
2752
2753 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2754 {
2755         struct ieee80211_local *local = sdata->local;
2756         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2757
2758         mutex_lock(&ifmgd->mtx);
2759
2760         if (ifmgd->auth_data &&
2761             time_after(jiffies, ifmgd->auth_data->timeout)) {
2762                 if (ifmgd->auth_data->done) {
2763                         /*
2764                          * ok ... we waited for assoc but userspace didn't,
2765                          * so let's just kill the auth data
2766                          */
2767                         ieee80211_destroy_auth_data(sdata, false);
2768                 } else if (ieee80211_probe_auth(sdata)) {
2769                         u8 bssid[ETH_ALEN];
2770
2771                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2772
2773                         ieee80211_destroy_auth_data(sdata, false);
2774
2775                         mutex_unlock(&ifmgd->mtx);
2776                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2777                         mutex_lock(&ifmgd->mtx);
2778                 }
2779         } else if (ifmgd->auth_data)
2780                 run_again(ifmgd, ifmgd->auth_data->timeout);
2781
2782         if (ifmgd->assoc_data &&
2783             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2784                 if (!ifmgd->assoc_data->have_beacon ||
2785                     ieee80211_do_assoc(sdata)) {
2786                         u8 bssid[ETH_ALEN];
2787
2788                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2789
2790                         ieee80211_destroy_assoc_data(sdata, false);
2791
2792                         mutex_unlock(&ifmgd->mtx);
2793                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2794                         mutex_lock(&ifmgd->mtx);
2795                 }
2796         } else if (ifmgd->assoc_data)
2797                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2798
2799         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2800                             IEEE80211_STA_CONNECTION_POLL) &&
2801             ifmgd->associated) {
2802                 u8 bssid[ETH_ALEN];
2803                 int max_tries;
2804
2805                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2806
2807                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2808                         max_tries = max_nullfunc_tries;
2809                 else
2810                         max_tries = max_probe_tries;
2811
2812                 /* ACK received for nullfunc probing frame */
2813                 if (!ifmgd->probe_send_count)
2814                         ieee80211_reset_ap_probe(sdata);
2815                 else if (ifmgd->nullfunc_failed) {
2816                         if (ifmgd->probe_send_count < max_tries) {
2817 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2818                                 wiphy_debug(local->hw.wiphy,
2819                                             "%s: No ack for nullfunc frame to"
2820                                             " AP %pM, try %d/%i\n",
2821                                             sdata->name, bssid,
2822                                             ifmgd->probe_send_count, max_tries);
2823 #endif
2824                                 ieee80211_mgd_probe_ap_send(sdata);
2825                         } else {
2826 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2827                                 wiphy_debug(local->hw.wiphy,
2828                                             "%s: No ack for nullfunc frame to"
2829                                             " AP %pM, disconnecting.\n",
2830                                             sdata->name, bssid);
2831 #endif
2832                                 ieee80211_sta_connection_lost(sdata, bssid,
2833                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2834                         }
2835                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2836                         run_again(ifmgd, ifmgd->probe_timeout);
2837                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2838 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2839                         wiphy_debug(local->hw.wiphy,
2840                                     "%s: Failed to send nullfunc to AP %pM"
2841                                     " after %dms, disconnecting.\n",
2842                                     sdata->name,
2843                                     bssid, probe_wait_ms);
2844 #endif
2845                         ieee80211_sta_connection_lost(sdata, bssid,
2846                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2847                 } else if (ifmgd->probe_send_count < max_tries) {
2848 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2849                         wiphy_debug(local->hw.wiphy,
2850                                     "%s: No probe response from AP %pM"
2851                                     " after %dms, try %d/%i\n",
2852                                     sdata->name,
2853                                     bssid, probe_wait_ms,
2854                                     ifmgd->probe_send_count, max_tries);
2855 #endif
2856                         ieee80211_mgd_probe_ap_send(sdata);
2857                 } else {
2858                         /*
2859                          * We actually lost the connection ... or did we?
2860                          * Let's make sure!
2861                          */
2862                         wiphy_debug(local->hw.wiphy,
2863                                     "%s: No probe response from AP %pM"
2864                                     " after %dms, disconnecting.\n",
2865                                     sdata->name,
2866                                     bssid, probe_wait_ms);
2867
2868                         ieee80211_sta_connection_lost(sdata, bssid,
2869                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2870                 }
2871         }
2872
2873         mutex_unlock(&ifmgd->mtx);
2874
2875         mutex_lock(&local->mtx);
2876         ieee80211_recalc_idle(local);
2877         mutex_unlock(&local->mtx);
2878 }
2879
2880 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2881 {
2882         struct ieee80211_sub_if_data *sdata =
2883                 (struct ieee80211_sub_if_data *) data;
2884         struct ieee80211_local *local = sdata->local;
2885
2886         if (local->quiescing)
2887                 return;
2888
2889         ieee80211_queue_work(&sdata->local->hw,
2890                              &sdata->u.mgd.beacon_connection_loss_work);
2891 }
2892
2893 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2894 {
2895         struct ieee80211_sub_if_data *sdata =
2896                 (struct ieee80211_sub_if_data *) data;
2897         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2898         struct ieee80211_local *local = sdata->local;
2899
2900         if (local->quiescing)
2901                 return;
2902
2903         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2904 }
2905
2906 static void ieee80211_sta_monitor_work(struct work_struct *work)
2907 {
2908         struct ieee80211_sub_if_data *sdata =
2909                 container_of(work, struct ieee80211_sub_if_data,
2910                              u.mgd.monitor_work);
2911
2912         ieee80211_mgd_probe_ap(sdata, false);
2913 }
2914
2915 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2916 {
2917         u32 flags;
2918
2919         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2920                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2921                                         IEEE80211_STA_CONNECTION_POLL);
2922
2923                 /* let's probe the connection once */
2924                 flags = sdata->local->hw.flags;
2925                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2926                         ieee80211_queue_work(&sdata->local->hw,
2927                                              &sdata->u.mgd.monitor_work);
2928                 /* and do all the other regular work too */
2929                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2930         }
2931 }
2932
2933 #ifdef CONFIG_PM
2934 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2935 {
2936         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2937
2938         /*
2939          * we need to use atomic bitops for the running bits
2940          * only because both timers might fire at the same
2941          * time -- the code here is properly synchronised.
2942          */
2943
2944         cancel_work_sync(&ifmgd->request_smps_work);
2945
2946         cancel_work_sync(&ifmgd->monitor_work);
2947         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2948         if (del_timer_sync(&ifmgd->timer))
2949                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2950
2951         cancel_work_sync(&ifmgd->chswitch_work);
2952         if (del_timer_sync(&ifmgd->chswitch_timer))
2953                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2954
2955         /* these will just be re-established on connection */
2956         del_timer_sync(&ifmgd->conn_mon_timer);
2957         del_timer_sync(&ifmgd->bcn_mon_timer);
2958 }
2959
2960 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2961 {
2962         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2963
2964         if (!ifmgd->associated)
2965                 return;
2966
2967         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2968                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2969                 mutex_lock(&ifmgd->mtx);
2970                 if (ifmgd->associated) {
2971 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2972                         wiphy_debug(sdata->local->hw.wiphy,
2973                                     "%s: driver requested disconnect after resume.\n",
2974                                     sdata->name);
2975 #endif
2976                         ieee80211_sta_connection_lost(sdata,
2977                                 ifmgd->associated->bssid,
2978                                 WLAN_REASON_UNSPECIFIED);
2979                         mutex_unlock(&ifmgd->mtx);
2980                         return;
2981                 }
2982                 mutex_unlock(&ifmgd->mtx);
2983         }
2984
2985         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2986                 add_timer(&ifmgd->timer);
2987         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2988                 add_timer(&ifmgd->chswitch_timer);
2989         ieee80211_sta_reset_beacon_monitor(sdata);
2990         ieee80211_restart_sta_timer(sdata);
2991 }
2992 #endif
2993
2994 /* interface setup */
2995 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2996 {
2997         struct ieee80211_if_managed *ifmgd;
2998
2999         ifmgd = &sdata->u.mgd;
3000         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3001         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3002         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3003                   ieee80211_beacon_connection_loss_work);
3004         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3005         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3006                     (unsigned long) sdata);
3007         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3008                     (unsigned long) sdata);
3009         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3010                     (unsigned long) sdata);
3011         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3012                     (unsigned long) sdata);
3013
3014         ifmgd->flags = 0;
3015         ifmgd->powersave = sdata->wdev.ps;
3016         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3017         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3018
3019         mutex_init(&ifmgd->mtx);
3020
3021         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3022                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3023         else
3024                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3025 }
3026
3027 /* scan finished notification */
3028 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3029 {
3030         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
3031
3032         /* Restart STA timers */
3033         rcu_read_lock();
3034         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3035                 ieee80211_restart_sta_timer(sdata);
3036         rcu_read_unlock();
3037 }
3038
3039 int ieee80211_max_network_latency(struct notifier_block *nb,
3040                                   unsigned long data, void *dummy)
3041 {
3042         s32 latency_usec = (s32) data;
3043         struct ieee80211_local *local =
3044                 container_of(nb, struct ieee80211_local,
3045                              network_latency_notifier);
3046
3047         mutex_lock(&local->iflist_mtx);
3048         ieee80211_recalc_ps(local, latency_usec);
3049         mutex_unlock(&local->iflist_mtx);
3050
3051         return 0;
3052 }
3053
3054 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3055                                      struct cfg80211_bss *cbss, bool assoc)
3056 {
3057         struct ieee80211_local *local = sdata->local;
3058         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3059         struct ieee80211_bss *bss = (void *)cbss->priv;
3060         struct sta_info *sta;
3061         bool have_sta = false;
3062         int err;
3063
3064         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3065                 return -EINVAL;
3066
3067         if (assoc) {
3068                 rcu_read_lock();
3069                 have_sta = sta_info_get(sdata, cbss->bssid);
3070                 rcu_read_unlock();
3071         }
3072
3073         if (!have_sta) {
3074                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3075                 if (!sta)
3076                         return -ENOMEM;
3077         }
3078
3079         mutex_lock(&local->mtx);
3080         ieee80211_recalc_idle(sdata->local);
3081         mutex_unlock(&local->mtx);
3082
3083         /* switch to the right channel */
3084         local->oper_channel = cbss->channel;
3085         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3086
3087         if (!have_sta) {
3088                 struct ieee80211_supported_band *sband;
3089                 u32 rates = 0, basic_rates = 0;
3090                 bool have_higher_than_11mbit;
3091                 int min_rate = INT_MAX, min_rate_index = -1;
3092
3093                 sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
3094
3095                 ieee80211_get_rates(sband, bss->supp_rates,
3096                                     bss->supp_rates_len,
3097                                     &rates, &basic_rates,
3098                                     &have_higher_than_11mbit,
3099                                     &min_rate, &min_rate_index);
3100
3101                 /*
3102                  * This used to be a workaround for basic rates missing
3103                  * in the association response frame. Now that we no
3104                  * longer use the basic rates from there, it probably
3105                  * doesn't happen any more, but keep the workaround so
3106                  * in case some *other* APs are buggy in different ways
3107                  * we can connect -- with a warning.
3108                  */
3109                 if (!basic_rates && min_rate_index >= 0) {
3110                         printk(KERN_DEBUG
3111                                "%s: No basic rates, using min rate instead.\n",
3112                                sdata->name);
3113                         basic_rates = BIT(min_rate_index);
3114                 }
3115
3116                 sta->sta.supp_rates[cbss->channel->band] = rates;
3117                 sdata->vif.bss_conf.basic_rates = basic_rates;
3118
3119                 /* cf. IEEE 802.11 9.2.12 */
3120                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3121                     have_higher_than_11mbit)
3122                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3123                 else
3124                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3125
3126                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3127
3128                 /* tell driver about BSSID and basic rates */
3129                 ieee80211_bss_info_change_notify(sdata,
3130                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES);
3131
3132                 if (assoc)
3133                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3134
3135                 err = sta_info_insert(sta);
3136                 sta = NULL;
3137                 if (err) {
3138                         printk(KERN_DEBUG
3139                                "%s: failed to insert STA entry for the AP (error %d)\n",
3140                                sdata->name, err);
3141                         return err;
3142                 }
3143         } else
3144                 WARN_ON_ONCE(compare_ether_addr(ifmgd->bssid, cbss->bssid));
3145
3146         return 0;
3147 }
3148
3149 /* config hooks */
3150 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3151                        struct cfg80211_auth_request *req)
3152 {
3153         struct ieee80211_local *local = sdata->local;
3154         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3155         struct ieee80211_mgd_auth_data *auth_data;
3156         u16 auth_alg;
3157         int err;
3158
3159         /* prepare auth data structure */
3160
3161         switch (req->auth_type) {
3162         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3163                 auth_alg = WLAN_AUTH_OPEN;
3164                 break;
3165         case NL80211_AUTHTYPE_SHARED_KEY:
3166                 if (IS_ERR(local->wep_tx_tfm))
3167                         return -EOPNOTSUPP;
3168                 auth_alg = WLAN_AUTH_SHARED_KEY;
3169                 break;
3170         case NL80211_AUTHTYPE_FT:
3171                 auth_alg = WLAN_AUTH_FT;
3172                 break;
3173         case NL80211_AUTHTYPE_NETWORK_EAP:
3174                 auth_alg = WLAN_AUTH_LEAP;
3175                 break;
3176         default:
3177                 return -EOPNOTSUPP;
3178         }
3179
3180         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3181         if (!auth_data)
3182                 return -ENOMEM;
3183
3184         auth_data->bss = req->bss;
3185
3186         if (req->ie && req->ie_len) {
3187                 memcpy(auth_data->ie, req->ie, req->ie_len);
3188                 auth_data->ie_len = req->ie_len;
3189         }
3190
3191         if (req->key && req->key_len) {
3192                 auth_data->key_len = req->key_len;
3193                 auth_data->key_idx = req->key_idx;
3194                 memcpy(auth_data->key, req->key, req->key_len);
3195         }
3196
3197         auth_data->algorithm = auth_alg;
3198
3199         /* try to authenticate/probe */
3200
3201         mutex_lock(&ifmgd->mtx);
3202
3203         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3204             ifmgd->assoc_data) {
3205                 err = -EBUSY;
3206                 goto err_free;
3207         }
3208
3209         if (ifmgd->auth_data)
3210                 ieee80211_destroy_auth_data(sdata, false);
3211
3212         /* prep auth_data so we don't go into idle on disassoc */
3213         ifmgd->auth_data = auth_data;
3214
3215         if (ifmgd->associated)
3216                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3217
3218         printk(KERN_DEBUG "%s: authenticate with %pM\n",
3219                sdata->name, req->bss->bssid);
3220
3221         err = ieee80211_prep_connection(sdata, req->bss, false);
3222         if (err)
3223                 goto err_clear;
3224
3225         err = ieee80211_probe_auth(sdata);
3226         if (err) {
3227                 sta_info_destroy_addr(sdata, req->bss->bssid);
3228                 goto err_clear;
3229         }
3230
3231         /* hold our own reference */
3232         cfg80211_ref_bss(auth_data->bss);
3233         err = 0;
3234         goto out_unlock;
3235
3236  err_clear:
3237         ifmgd->auth_data = NULL;
3238  err_free:
3239         kfree(auth_data);
3240  out_unlock:
3241         mutex_unlock(&ifmgd->mtx);
3242
3243         return err;
3244 }
3245
3246 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3247                         struct cfg80211_assoc_request *req)
3248 {
3249         struct ieee80211_local *local = sdata->local;
3250         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3251         struct ieee80211_bss *bss = (void *)req->bss->priv;
3252         struct ieee80211_mgd_assoc_data *assoc_data;
3253         struct ieee80211_supported_band *sband;
3254         const u8 *ssidie;
3255         int i, err;
3256
3257         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3258         if (!ssidie)
3259                 return -EINVAL;
3260
3261         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3262         if (!assoc_data)
3263                 return -ENOMEM;
3264
3265         mutex_lock(&ifmgd->mtx);
3266
3267         if (ifmgd->associated)
3268                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3269
3270         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3271                 err = -EBUSY;
3272                 goto err_free;
3273         }
3274
3275         if (ifmgd->assoc_data) {
3276                 err = -EBUSY;
3277                 goto err_free;
3278         }
3279
3280         if (ifmgd->auth_data) {
3281                 bool match;
3282
3283                 /* keep sta info, bssid if matching */
3284                 match = compare_ether_addr(ifmgd->bssid, req->bss->bssid) == 0;
3285                 ieee80211_destroy_auth_data(sdata, match);
3286         }
3287
3288         /* prepare assoc data */
3289
3290         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3291         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3292
3293         ifmgd->beacon_crc_valid = false;
3294
3295         /*
3296          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3297          * We still associate in non-HT mode (11a/b/g) if any one of these
3298          * ciphers is configured as pairwise.
3299          * We can set this to true for non-11n hardware, that'll be checked
3300          * separately along with the peer capabilities.
3301          */
3302         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
3303                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3304                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3305                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
3306                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3307
3308         if (req->flags & ASSOC_REQ_DISABLE_HT)
3309                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3310
3311         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3312         sband = local->hw.wiphy->bands[req->bss->channel->band];
3313         if (!sband->ht_cap.ht_supported ||
3314             local->hw.queues < 4 || !bss->wmm_used)
3315                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3316
3317         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3318         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3319                sizeof(ifmgd->ht_capa_mask));
3320
3321         if (req->ie && req->ie_len) {
3322                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3323                 assoc_data->ie_len = req->ie_len;
3324         }
3325
3326         assoc_data->bss = req->bss;
3327
3328         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3329                 if (ifmgd->powersave)
3330                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3331                 else
3332                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3333         } else
3334                 ifmgd->ap_smps = ifmgd->req_smps;
3335
3336         assoc_data->capability = req->bss->capability;
3337         assoc_data->wmm = bss->wmm_used && (local->hw.queues >= 4);
3338         assoc_data->supp_rates = bss->supp_rates;
3339         assoc_data->supp_rates_len = bss->supp_rates_len;
3340         assoc_data->ht_information_ie =
3341                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
3342
3343         if (bss->wmm_used && bss->uapsd_supported &&
3344             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3345                 assoc_data->uapsd = true;
3346                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3347         } else {
3348                 assoc_data->uapsd = false;
3349                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3350         }
3351
3352         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3353         assoc_data->ssid_len = ssidie[1];
3354
3355         if (req->prev_bssid)
3356                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3357
3358         if (req->use_mfp) {
3359                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3360                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3361         } else {
3362                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3363                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3364         }
3365
3366         if (req->crypto.control_port)
3367                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3368         else
3369                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3370
3371         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3372         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3373
3374         /* kick off associate process */
3375
3376         ifmgd->assoc_data = assoc_data;
3377
3378         err = ieee80211_prep_connection(sdata, req->bss, true);
3379         if (err)
3380                 goto err_clear;
3381
3382         if (!bss->dtim_period &&
3383             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3384                 /*
3385                  * Wait up to one beacon interval ...
3386                  * should this be more if we miss one?
3387                  */
3388                 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
3389                        sdata->name, ifmgd->bssid);
3390                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3391         } else {
3392                 assoc_data->have_beacon = true;
3393                 assoc_data->sent_assoc = false;
3394                 assoc_data->timeout = jiffies;
3395         }
3396         run_again(ifmgd, assoc_data->timeout);
3397
3398         if (bss->corrupt_data) {
3399                 char *corrupt_type = "data";
3400                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3401                         if (bss->corrupt_data &
3402                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3403                                 corrupt_type = "beacon and probe response";
3404                         else
3405                                 corrupt_type = "beacon";
3406                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3407                         corrupt_type = "probe response";
3408                 printk(KERN_DEBUG "%s: associating with AP with corrupt %s\n",
3409                        sdata->name, corrupt_type);
3410         }
3411
3412         err = 0;
3413         goto out;
3414  err_clear:
3415         ifmgd->assoc_data = NULL;
3416  err_free:
3417         kfree(assoc_data);
3418  out:
3419         mutex_unlock(&ifmgd->mtx);
3420
3421         return err;
3422 }
3423
3424 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3425                          struct cfg80211_deauth_request *req)
3426 {
3427         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3428         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3429
3430         mutex_lock(&ifmgd->mtx);
3431
3432         if (ifmgd->auth_data) {
3433                 ieee80211_destroy_auth_data(sdata, false);
3434                 mutex_unlock(&ifmgd->mtx);
3435                 return 0;
3436         }
3437
3438         printk(KERN_DEBUG
3439                "%s: deauthenticating from %pM by local choice (reason=%d)\n",
3440                sdata->name, req->bssid, req->reason_code);
3441
3442         if (ifmgd->associated &&
3443             compare_ether_addr(ifmgd->associated->bssid, req->bssid) == 0)
3444                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3445                                        req->reason_code, true, frame_buf);
3446         else
3447                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3448                                                IEEE80211_STYPE_DEAUTH,
3449                                                req->reason_code, true,
3450                                                frame_buf);
3451         mutex_unlock(&ifmgd->mtx);
3452
3453         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3454
3455         mutex_lock(&sdata->local->mtx);
3456         ieee80211_recalc_idle(sdata->local);
3457         mutex_unlock(&sdata->local->mtx);
3458
3459         return 0;
3460 }
3461
3462 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3463                            struct cfg80211_disassoc_request *req)
3464 {
3465         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3466         u8 bssid[ETH_ALEN];
3467         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3468
3469         mutex_lock(&ifmgd->mtx);
3470
3471         /*
3472          * cfg80211 should catch this ... but it's racy since
3473          * we can receive a disassoc frame, process it, hand it
3474          * to cfg80211 while that's in a locked section already
3475          * trying to tell us that the user wants to disconnect.
3476          */
3477         if (ifmgd->associated != req->bss) {
3478                 mutex_unlock(&ifmgd->mtx);
3479                 return -ENOLINK;
3480         }
3481
3482         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
3483                sdata->name, req->bss->bssid, req->reason_code);
3484
3485         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3486         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3487                                req->reason_code, !req->local_state_change,
3488                                frame_buf);
3489         mutex_unlock(&ifmgd->mtx);
3490
3491         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3492
3493         mutex_lock(&sdata->local->mtx);
3494         ieee80211_recalc_idle(sdata->local);
3495         mutex_unlock(&sdata->local->mtx);
3496
3497         return 0;
3498 }
3499
3500 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3501 {
3502         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3503
3504         mutex_lock(&ifmgd->mtx);
3505         if (ifmgd->assoc_data)
3506                 ieee80211_destroy_assoc_data(sdata, false);
3507         if (ifmgd->auth_data)
3508                 ieee80211_destroy_auth_data(sdata, false);
3509         del_timer_sync(&ifmgd->timer);
3510         mutex_unlock(&ifmgd->mtx);
3511 }
3512
3513 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3514                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3515                                gfp_t gfp)
3516 {
3517         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3518
3519         trace_api_cqm_rssi_notify(sdata, rssi_event);
3520
3521         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3522 }
3523 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
3524
3525 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
3526 {
3527         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3528         return sdata->dev->operstate;
3529 }
3530 EXPORT_SYMBOL(ieee80211_get_operstate);