net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  34 #define IEEE80211_AUTH_MAX_TRIES 3
  35 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
  36 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  37 #define IEEE80211_ASSOC_MAX_TRIES 3
  38
  39 static int max_nullfunc_tries = 2;
  40 module_param(max_nullfunc_tries, int, 0644);
  41 MODULE_PARM_DESC(max_nullfunc_tries,
  42                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  43
  44 static int max_probe_tries = 5;
  45 module_param(max_probe_tries, int, 0644);
  46 MODULE_PARM_DESC(max_probe_tries,
  47                  "Maximum probe tries before disconnecting (reason 4).");
  48
  49 /*
  50  * Beacon loss timeout is calculated as N frames times the
  51  * advertised beacon interval.  This may need to be somewhat
  52  * higher than what hardware might detect to account for
  53  * delays in the host processing frames. But since we also
  54  * probe on beacon miss before declaring the connection lost
  55  * default to what we want.
  56  */
  57 #define IEEE80211_BEACON_LOSS_COUNT     7
  58
  59 /*
  60  * Time the connection can be idle before we probe
  61  * it to see if we can still talk to the AP.
  62  */
  63 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  64 /*
  65  * Time we wait for a probe response after sending
  66  * a probe request because of beacon loss or for
  67  * checking the connection still works.
  68  */
  69 static int probe_wait_ms = 500;
  70 module_param(probe_wait_ms, int, 0644);
  71 MODULE_PARM_DESC(probe_wait_ms,
  72                  "Maximum time(ms) to wait for probe response"
  73                  " before disconnecting (reason 4).");
  74
  75 /*
  76  * Weight given to the latest Beacon frame when calculating average signal
  77  * strength for Beacon frames received in the current BSS. This must be
  78  * between 1 and 15.
  79  */
  80 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  81
  82 /*
  83  * How many Beacon frames need to have been used in average signal strength
  84  * before starting to indicate signal change events.
  85  */
  86 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  87
  88 #define TMR_RUNNING_TIMER       0
  89 #define TMR_RUNNING_CHANSW      1
  90
  91 #define DEAUTH_DISASSOC_LEN     (24 /* hdr */ + 2 /* reason */)
  92
  93 /*
  94  * All cfg80211 functions have to be called outside a locked
  95  * section so that they can acquire a lock themselves... This
  96  * is much simpler than queuing up things in cfg80211, but we
  97  * do need some indirection for that here.
  98  */
  99 enum rx_mgmt_action {
 100         /* no action required */
 101         RX_MGMT_NONE,
 102
 103         /* caller must call cfg80211_send_deauth() */
 104         RX_MGMT_CFG80211_DEAUTH,
 105
 106         /* caller must call cfg80211_send_disassoc() */
 107         RX_MGMT_CFG80211_DISASSOC,
 108
 109         /* caller must call cfg80211_send_rx_auth() */
 110         RX_MGMT_CFG80211_RX_AUTH,
 111
 112         /* caller must call cfg80211_send_rx_assoc() */
 113         RX_MGMT_CFG80211_RX_ASSOC,
 114
 115         /* caller must call cfg80211_send_assoc_timeout() */
 116         RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 117 };
 118
 119 /* utils */
 120 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 121 {
 122         lockdep_assert_held(&ifmgd->mtx);
 123 }
 124
 125 /*
 126  * We can have multiple work items (and connection probing)
 127  * scheduling this timer, but we need to take care to only
 128  * reschedule it when it should fire _earlier_ than it was
 129  * asked for before, or if it's not pending right now. This
 130  * function ensures that. Note that it then is required to
 131  * run this function for all timeouts after the first one
 132  * has happened -- the work that runs from this timer will
 133  * do that.
 134  */
 135 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 136 {
 137         ASSERT_MGD_MTX(ifmgd);
 138
 139         if (!timer_pending(&ifmgd->timer) ||
 140             time_before(timeout, ifmgd->timer.expires))
 141                 mod_timer(&ifmgd->timer, timeout);
 142 }
 143
 144 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 145 {
 146         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 147                 return;
 148
 149         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 150                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 151 }
 152
 153 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 154 {
 155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 156
 157         if (unlikely(!sdata->u.mgd.associated))
 158                 return;
 159
 160         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 161                 return;
 162
 163         mod_timer(&sdata->u.mgd.conn_mon_timer,
 164                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 165
 166         ifmgd->probe_send_count = 0;
 167 }
 168
 169 static int ecw2cw(int ecw)
 170 {
 171         return (1 << ecw) - 1;
 172 }
 173
 174 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
 175                                   struct ieee80211_ht_operation *ht_oper,
 176                                   const u8 *bssid, bool reconfig)
 177 {
 178         struct ieee80211_local *local = sdata->local;
 179         struct ieee80211_supported_band *sband;
 180         struct sta_info *sta;
 181         u32 changed = 0;
 182         u16 ht_opmode;
 183         bool disable_40 = false;
 184
 185         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 186
 187         switch (sdata->vif.bss_conf.channel_type) {
 188         case NL80211_CHAN_HT40PLUS:
 189                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 190                         disable_40 = true;
 191                 break;
 192         case NL80211_CHAN_HT40MINUS:
 193                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
 194                         disable_40 = true;
 195                 break;
 196         default:
 197                 break;
 198         }
 199
 200         /* This can change during the lifetime of the BSS */
 201         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 202                 disable_40 = true;
 203
 204         mutex_lock(&local->sta_mtx);
 205         sta = sta_info_get(sdata, bssid);
 206
 207         WARN_ON_ONCE(!sta);
 208
 209         if (sta && !sta->supports_40mhz)
 210                 disable_40 = true;
 211
 212         if (sta && (!reconfig ||
 213                     (disable_40 != !(sta->sta.ht_cap.cap &
 214                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 215
 216                 if (disable_40)
 217                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 218                 else
 219                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 220
 221                 rate_control_rate_update(local, sband, sta,
 222                                          IEEE80211_RC_BW_CHANGED);
 223         }
 224         mutex_unlock(&local->sta_mtx);
 225
 226         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 227
 228         /* if bss configuration changed store the new one */
 229         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 230                 changed |= BSS_CHANGED_HT;
 231                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 232         }
 233
 234         return changed;
 235 }
 236
 237 /* frame sending functions */
 238
 239 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 240                                       struct ieee80211_supported_band *sband,
 241                                       u32 *rates)
 242 {
 243         int i, j, count;
 244         *rates = 0;
 245         count = 0;
 246         for (i = 0; i < supp_rates_len; i++) {
 247                 int rate = (supp_rates[i] & 0x7F) * 5;
 248
 249                 for (j = 0; j < sband->n_bitrates; j++)
 250                         if (sband->bitrates[j].bitrate == rate) {
 251                                 *rates |= BIT(j);
 252                                 count++;
 253                                 break;
 254                         }
 255         }
 256
 257         return count;
 258 }
 259
 260 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 261                                 struct sk_buff *skb, u8 ap_ht_param,
 262                                 struct ieee80211_supported_band *sband,
 263                                 struct ieee80211_channel *channel,
 264                                 enum ieee80211_smps_mode smps)
 265 {
 266         u8 *pos;
 267         u32 flags = channel->flags;
 268         u16 cap;
 269         struct ieee80211_sta_ht_cap ht_cap;
 270
 271         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 272
 273         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 274         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 275
 276         /* determine capability flags */
 277         cap = ht_cap.cap;
 278
 279         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 280         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 281                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 282                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 283                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 284                 }
 285                 break;
 286         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 287                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 288                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 289                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 290                 }
 291                 break;
 292         }
 293
 294         /*
 295          * If 40 MHz was disabled associate as though we weren't
 296          * capable of 40 MHz -- some broken APs will never fall
 297          * back to trying to transmit in 20 MHz.
 298          */
 299         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 300                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 301                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 302         }
 303
 304         /* set SM PS mode properly */
 305         cap &= ~IEEE80211_HT_CAP_SM_PS;
 306         switch (smps) {
 307         case IEEE80211_SMPS_AUTOMATIC:
 308         case IEEE80211_SMPS_NUM_MODES:
 309                 WARN_ON(1);
 310         case IEEE80211_SMPS_OFF:
 311                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 312                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 313                 break;
 314         case IEEE80211_SMPS_STATIC:
 315                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 316                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 317                 break;
 318         case IEEE80211_SMPS_DYNAMIC:
 319                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 320                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 321                 break;
 322         }
 323
 324         /* reserve and fill IE */
 325         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 326         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 327 }
 328
 329 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 330 {
 331         struct ieee80211_local *local = sdata->local;
 332         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 333         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 334         struct sk_buff *skb;
 335         struct ieee80211_mgmt *mgmt;
 336         u8 *pos, qos_info;
 337         size_t offset = 0, noffset;
 338         int i, count, rates_len, supp_rates_len;
 339         u16 capab;
 340         struct ieee80211_supported_band *sband;
 341         u32 rates = 0;
 342
 343         lockdep_assert_held(&ifmgd->mtx);
 344
 345         sband = local->hw.wiphy->bands[local->oper_channel->band];
 346
 347         if (assoc_data->supp_rates_len) {
 348                 /*
 349                  * Get all rates supported by the device and the AP as
 350                  * some APs don't like getting a superset of their rates
 351                  * in the association request (e.g. D-Link DAP 1353 in
 352                  * b-only mode)...
 353                  */
 354                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 355                                                        assoc_data->supp_rates_len,
 356                                                        sband, &rates);
 357         } else {
 358                 /*
 359                  * In case AP not provide any supported rates information
 360                  * before association, we send information element(s) with
 361                  * all rates that we support.
 362                  */
 363                 rates = ~0;
 364                 rates_len = sband->n_bitrates;
 365         }
 366
 367         skb = alloc_skb(local->hw.extra_tx_headroom +
 368                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 369                         2 + assoc_data->ssid_len + /* SSID */
 370                         4 + rates_len + /* (extended) rates */
 371                         4 + /* power capability */
 372                         2 + 2 * sband->n_channels + /* supported channels */
 373                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 374                         assoc_data->ie_len + /* extra IEs */
 375                         9, /* WMM */
 376                         GFP_KERNEL);
 377         if (!skb)
 378                 return;
 379
 380         skb_reserve(skb, local->hw.extra_tx_headroom);
 381
 382         capab = WLAN_CAPABILITY_ESS;
 383
 384         if (sband->band == IEEE80211_BAND_2GHZ) {
 385                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 386                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 387                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 388                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 389         }
 390
 391         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 392                 capab |= WLAN_CAPABILITY_PRIVACY;
 393
 394         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 395             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 396                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 397
 398         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 399         memset(mgmt, 0, 24);
 400         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 401         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 402         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 403
 404         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 405                 skb_put(skb, 10);
 406                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 407                                                   IEEE80211_STYPE_REASSOC_REQ);
 408                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 409                 mgmt->u.reassoc_req.listen_interval =
 410                                 cpu_to_le16(local->hw.conf.listen_interval);
 411                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 412                        ETH_ALEN);
 413         } else {
 414                 skb_put(skb, 4);
 415                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 416                                                   IEEE80211_STYPE_ASSOC_REQ);
 417                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 418                 mgmt->u.assoc_req.listen_interval =
 419                                 cpu_to_le16(local->hw.conf.listen_interval);
 420         }
 421
 422         /* SSID */
 423         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 424         *pos++ = WLAN_EID_SSID;
 425         *pos++ = assoc_data->ssid_len;
 426         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 427
 428         /* add all rates which were marked to be used above */
 429         supp_rates_len = rates_len;
 430         if (supp_rates_len > 8)
 431                 supp_rates_len = 8;
 432
 433         pos = skb_put(skb, supp_rates_len + 2);
 434         *pos++ = WLAN_EID_SUPP_RATES;
 435         *pos++ = supp_rates_len;
 436
 437         count = 0;
 438         for (i = 0; i < sband->n_bitrates; i++) {
 439                 if (BIT(i) & rates) {
 440                         int rate = sband->bitrates[i].bitrate;
 441                         *pos++ = (u8) (rate / 5);
 442                         if (++count == 8)
 443                                 break;
 444                 }
 445         }
 446
 447         if (rates_len > count) {
 448                 pos = skb_put(skb, rates_len - count + 2);
 449                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 450                 *pos++ = rates_len - count;
 451
 452                 for (i++; i < sband->n_bitrates; i++) {
 453                         if (BIT(i) & rates) {
 454                                 int rate = sband->bitrates[i].bitrate;
 455                                 *pos++ = (u8) (rate / 5);
 456                         }
 457                 }
 458         }
 459
 460         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 461                 /* 1. power capabilities */
 462                 pos = skb_put(skb, 4);
 463                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 464                 *pos++ = 2;
 465                 *pos++ = 0; /* min tx power */
 466                 *pos++ = local->oper_channel->max_power; /* max tx power */
 467
 468                 /* 2. supported channels */
 469                 /* TODO: get this in reg domain format */
 470                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 471                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 472                 *pos++ = 2 * sband->n_channels;
 473                 for (i = 0; i < sband->n_channels; i++) {
 474                         *pos++ = ieee80211_frequency_to_channel(
 475                                         sband->channels[i].center_freq);
 476                         *pos++ = 1; /* one channel in the subband*/
 477                 }
 478         }
 479
 480         /* if present, add any custom IEs that go before HT */
 481         if (assoc_data->ie_len && assoc_data->ie) {
 482                 static const u8 before_ht[] = {
 483                         WLAN_EID_SSID,
 484                         WLAN_EID_SUPP_RATES,
 485                         WLAN_EID_EXT_SUPP_RATES,
 486                         WLAN_EID_PWR_CAPABILITY,
 487                         WLAN_EID_SUPPORTED_CHANNELS,
 488                         WLAN_EID_RSN,
 489                         WLAN_EID_QOS_CAPA,
 490                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 491                         WLAN_EID_MOBILITY_DOMAIN,
 492                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 493                 };
 494                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 495                                              before_ht, ARRAY_SIZE(before_ht),
 496                                              offset);
 497                 pos = skb_put(skb, noffset - offset);
 498                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 499                 offset = noffset;
 500         }
 501
 502         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 503                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 504                                     sband, local->oper_channel, ifmgd->ap_smps);
 505
 506         /* if present, add any custom non-vendor IEs that go after HT */
 507         if (assoc_data->ie_len && assoc_data->ie) {
 508                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 509                                                     assoc_data->ie_len,
 510                                                     offset);
 511                 pos = skb_put(skb, noffset - offset);
 512                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 513                 offset = noffset;
 514         }
 515
 516         if (assoc_data->wmm) {
 517                 if (assoc_data->uapsd) {
 518                         qos_info = ifmgd->uapsd_queues;
 519                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 520                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 521                 } else {
 522                         qos_info = 0;
 523                 }
 524
 525                 pos = skb_put(skb, 9);
 526                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 527                 *pos++ = 7; /* len */
 528                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 529                 *pos++ = 0x50;
 530                 *pos++ = 0xf2;
 531                 *pos++ = 2; /* WME */
 532                 *pos++ = 0; /* WME info */
 533                 *pos++ = 1; /* WME ver */
 534                 *pos++ = qos_info;
 535         }
 536
 537         /* add any remaining custom (i.e. vendor specific here) IEs */
 538         if (assoc_data->ie_len && assoc_data->ie) {
 539                 noffset = assoc_data->ie_len;
 540                 pos = skb_put(skb, noffset - offset);
 541                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 542         }
 543
 544         drv_mgd_prepare_tx(local, sdata);
 545
 546         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 547         ieee80211_tx_skb(sdata, skb);
 548 }
 549
 550 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 551                                            const u8 *bssid, u16 stype,
 552                                            u16 reason, bool send_frame,
 553                                            u8 *frame_buf)
 554 {
 555         struct ieee80211_local *local = sdata->local;
 556         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 557         struct sk_buff *skb;
 558         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 559
 560         /* build frame */
 561         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 562         mgmt->duration = 0; /* initialize only */
 563         mgmt->seq_ctrl = 0; /* initialize only */
 564         memcpy(mgmt->da, bssid, ETH_ALEN);
 565         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 566         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 567         /* u.deauth.reason_code == u.disassoc.reason_code */
 568         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 569
 570         if (send_frame) {
 571                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 572                                     DEAUTH_DISASSOC_LEN);
 573                 if (!skb)
 574                         return;
 575
 576                 skb_reserve(skb, local->hw.extra_tx_headroom);
 577
 578                 /* copy in frame */
 579                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 580                        mgmt, DEAUTH_DISASSOC_LEN);
 581
 582                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 583                         IEEE80211_SKB_CB(skb)->flags |=
 584                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 585
 586                 drv_mgd_prepare_tx(local, sdata);
 587
 588                 ieee80211_tx_skb(sdata, skb);
 589         }
 590 }
 591
 592 void ieee80211_send_pspoll(struct ieee80211_local *local,
 593                            struct ieee80211_sub_if_data *sdata)
 594 {
 595         struct ieee80211_pspoll *pspoll;
 596         struct sk_buff *skb;
 597
 598         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 599         if (!skb)
 600                 return;
 601
 602         pspoll = (struct ieee80211_pspoll *) skb->data;
 603         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 604
 605         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 606         ieee80211_tx_skb(sdata, skb);
 607 }
 608
 609 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 610                              struct ieee80211_sub_if_data *sdata,
 611                              int powersave)
 612 {
 613         struct sk_buff *skb;
 614         struct ieee80211_hdr_3addr *nullfunc;
 615         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 616
 617         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 618         if (!skb)
 619                 return;
 620
 621         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 622         if (powersave)
 623                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 624
 625         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 626         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 627                             IEEE80211_STA_CONNECTION_POLL))
 628                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 629
 630         ieee80211_tx_skb(sdata, skb);
 631 }
 632
 633 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 634                                           struct ieee80211_sub_if_data *sdata)
 635 {
 636         struct sk_buff *skb;
 637         struct ieee80211_hdr *nullfunc;
 638         __le16 fc;
 639
 640         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 641                 return;
 642
 643         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 644         if (!skb)
 645                 return;
 646
 647         skb_reserve(skb, local->hw.extra_tx_headroom);
 648
 649         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 650         memset(nullfunc, 0, 30);
 651         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 652                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 653         nullfunc->frame_control = fc;
 654         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 655         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 656         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 657         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 658
 659         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 660         ieee80211_tx_skb(sdata, skb);
 661 }
 662
 663 /* spectrum management related things */
 664 static void ieee80211_chswitch_work(struct work_struct *work)
 665 {
 666         struct ieee80211_sub_if_data *sdata =
 667                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 668         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 669
 670         if (!ieee80211_sdata_running(sdata))
 671                 return;
 672
 673         mutex_lock(&ifmgd->mtx);
 674         if (!ifmgd->associated)
 675                 goto out;
 676
 677         sdata->local->oper_channel = sdata->local->csa_channel;
 678         if (!sdata->local->ops->channel_switch) {
 679                 /* call "hw_config" only if doing sw channel switch */
 680                 ieee80211_hw_config(sdata->local,
 681                         IEEE80211_CONF_CHANGE_CHANNEL);
 682         } else {
 683                 /* update the device channel directly */
 684                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 685         }
 686
 687         /* XXX: shouldn't really modify cfg80211-owned data! */
 688         ifmgd->associated->channel = sdata->local->oper_channel;
 689
 690         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 691                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 692  out:
 693         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 694         mutex_unlock(&ifmgd->mtx);
 695 }
 696
 697 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 698 {
 699         struct ieee80211_sub_if_data *sdata;
 700         struct ieee80211_if_managed *ifmgd;
 701
 702         sdata = vif_to_sdata(vif);
 703         ifmgd = &sdata->u.mgd;
 704
 705         trace_api_chswitch_done(sdata, success);
 706         if (!success) {
 707                 /*
 708                  * If the channel switch was not successful, stay
 709                  * around on the old channel. We currently lack
 710                  * good handling of this situation, possibly we
 711                  * should just drop the association.
 712                  */
 713                 sdata->local->csa_channel = sdata->local->oper_channel;
 714         }
 715
 716         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 717 }
 718 EXPORT_SYMBOL(ieee80211_chswitch_done);
 719
 720 static void ieee80211_chswitch_timer(unsigned long data)
 721 {
 722         struct ieee80211_sub_if_data *sdata =
 723                 (struct ieee80211_sub_if_data *) data;
 724         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 725
 726         if (sdata->local->quiescing) {
 727                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 728                 return;
 729         }
 730
 731         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 732 }
 733
 734 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 735                                       struct ieee80211_channel_sw_ie *sw_elem,
 736                                       struct ieee80211_bss *bss,
 737                                       u64 timestamp)
 738 {
 739         struct cfg80211_bss *cbss =
 740                 container_of((void *)bss, struct cfg80211_bss, priv);
 741         struct ieee80211_channel *new_ch;
 742         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 743         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 744                                                       cbss->channel->band);
 745
 746         ASSERT_MGD_MTX(ifmgd);
 747
 748         if (!ifmgd->associated)
 749                 return;
 750
 751         if (sdata->local->scanning)
 752                 return;
 753
 754         /* Disregard subsequent beacons if we are already running a timer
 755            processing a CSA */
 756
 757         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 758                 return;
 759
 760         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 761         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 762                 return;
 763
 764         sdata->local->csa_channel = new_ch;
 765
 766         if (sdata->local->ops->channel_switch) {
 767                 /* use driver's channel switch callback */
 768                 struct ieee80211_channel_switch ch_switch;
 769                 memset(&ch_switch, 0, sizeof(ch_switch));
 770                 ch_switch.timestamp = timestamp;
 771                 if (sw_elem->mode) {
 772                         ch_switch.block_tx = true;
 773                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 774                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 775                 }
 776                 ch_switch.channel = new_ch;
 777                 ch_switch.count = sw_elem->count;
 778                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 779                 drv_channel_switch(sdata->local, &ch_switch);
 780                 return;
 781         }
 782
 783         /* channel switch handled in software */
 784         if (sw_elem->count <= 1) {
 785                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 786         } else {
 787                 if (sw_elem->mode)
 788                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 789                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 790                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 791                 mod_timer(&ifmgd->chswitch_timer,
 792                           jiffies +
 793                           msecs_to_jiffies(sw_elem->count *
 794                                            cbss->beacon_interval));
 795         }
 796 }
 797
 798 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 799                                         u16 capab_info, u8 *pwr_constr_elem,
 800                                         u8 pwr_constr_elem_len)
 801 {
 802         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 803
 804         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 805                 return;
 806
 807         /* Power constraint IE length should be 1 octet */
 808         if (pwr_constr_elem_len != 1)
 809                 return;
 810
 811         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 812             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 813                 sdata->local->power_constr_level = *pwr_constr_elem;
 814                 ieee80211_hw_config(sdata->local, 0);
 815         }
 816 }
 817
 818 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 819 {
 820         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 821         struct ieee80211_local *local = sdata->local;
 822         struct ieee80211_conf *conf = &local->hw.conf;
 823
 824         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 825                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 826                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 827
 828         local->disable_dynamic_ps = false;
 829         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 830 }
 831 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 832
 833 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 834 {
 835         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 836         struct ieee80211_local *local = sdata->local;
 837         struct ieee80211_conf *conf = &local->hw.conf;
 838
 839         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 840                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 841                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 842
 843         local->disable_dynamic_ps = true;
 844         conf->dynamic_ps_timeout = 0;
 845         del_timer_sync(&local->dynamic_ps_timer);
 846         ieee80211_queue_work(&local->hw,
 847                              &local->dynamic_ps_enable_work);
 848 }
 849 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 850
 851 /* powersave */
 852 static void ieee80211_enable_ps(struct ieee80211_local *local,
 853                                 struct ieee80211_sub_if_data *sdata)
 854 {
 855         struct ieee80211_conf *conf = &local->hw.conf;
 856
 857         /*
 858          * If we are scanning right now then the parameters will
 859          * take effect when scan finishes.
 860          */
 861         if (local->scanning)
 862                 return;
 863
 864         if (conf->dynamic_ps_timeout > 0 &&
 865             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 866                 mod_timer(&local->dynamic_ps_timer, jiffies +
 867                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 868         } else {
 869                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 870                         ieee80211_send_nullfunc(local, sdata, 1);
 871
 872                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 873                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 874                         return;
 875
 876                 conf->flags |= IEEE80211_CONF_PS;
 877                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 878         }
 879 }
 880
 881 static void ieee80211_change_ps(struct ieee80211_local *local)
 882 {
 883         struct ieee80211_conf *conf = &local->hw.conf;
 884
 885         if (local->ps_sdata) {
 886                 ieee80211_enable_ps(local, local->ps_sdata);
 887         } else if (conf->flags & IEEE80211_CONF_PS) {
 888                 conf->flags &= ~IEEE80211_CONF_PS;
 889                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 890                 del_timer_sync(&local->dynamic_ps_timer);
 891                 cancel_work_sync(&local->dynamic_ps_enable_work);
 892         }
 893 }
 894
 895 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 896 {
 897         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 898         struct sta_info *sta = NULL;
 899         bool authorized = false;
 900
 901         if (!mgd->powersave)
 902                 return false;
 903
 904         if (mgd->broken_ap)
 905                 return false;
 906
 907         if (!mgd->associated)
 908                 return false;
 909
 910         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 911                           IEEE80211_STA_CONNECTION_POLL))
 912                 return false;
 913
 914         rcu_read_lock();
 915         sta = sta_info_get(sdata, mgd->bssid);
 916         if (sta)
 917                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 918         rcu_read_unlock();
 919
 920         return authorized;
 921 }
 922
 923 /* need to hold RTNL or interface lock */
 924 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 925 {
 926         struct ieee80211_sub_if_data *sdata, *found = NULL;
 927         int count = 0;
 928         int timeout;
 929
 930         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 931                 local->ps_sdata = NULL;
 932                 return;
 933         }
 934
 935         list_for_each_entry(sdata, &local->interfaces, list) {
 936                 if (!ieee80211_sdata_running(sdata))
 937                         continue;
 938                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 939                         /* If an AP vif is found, then disable PS
 940                          * by setting the count to zero thereby setting
 941                          * ps_sdata to NULL.
 942                          */
 943                         count = 0;
 944                         break;
 945                 }
 946                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 947                         continue;
 948                 found = sdata;
 949                 count++;
 950         }
 951
 952         if (count == 1 && ieee80211_powersave_allowed(found)) {
 953                 struct ieee80211_conf *conf = &local->hw.conf;
 954                 s32 beaconint_us;
 955
 956                 if (latency < 0)
 957                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 958
 959                 beaconint_us = ieee80211_tu_to_usec(
 960                                         found->vif.bss_conf.beacon_int);
 961
 962                 timeout = local->dynamic_ps_forced_timeout;
 963                 if (timeout < 0) {
 964                         /*
 965                          * Go to full PSM if the user configures a very low
 966                          * latency requirement.
 967                          * The 2000 second value is there for compatibility
 968                          * until the PM_QOS_NETWORK_LATENCY is configured
 969                          * with real values.
 970                          */
 971                         if (latency > (1900 * USEC_PER_MSEC) &&
 972                             latency != (2000 * USEC_PER_SEC))
 973                                 timeout = 0;
 974                         else
 975                                 timeout = 100;
 976                 }
 977                 local->dynamic_ps_user_timeout = timeout;
 978                 if (!local->disable_dynamic_ps)
 979                         conf->dynamic_ps_timeout =
 980                                 local->dynamic_ps_user_timeout;
 981
 982                 if (beaconint_us > latency) {
 983                         local->ps_sdata = NULL;
 984                 } else {
 985                         struct ieee80211_bss *bss;
 986                         int maxslp = 1;
 987                         u8 dtimper;
 988
 989                         bss = (void *)found->u.mgd.associated->priv;
 990                         dtimper = bss->dtim_period;
 991
 992                         /* If the TIM IE is invalid, pretend the value is 1 */
 993                         if (!dtimper)
 994                                 dtimper = 1;
 995                         else if (dtimper > 1)
 996                                 maxslp = min_t(int, dtimper,
 997                                                     latency / beaconint_us);
 998
 999                         local->hw.conf.max_sleep_period = maxslp;
1000                         local->hw.conf.ps_dtim_period = dtimper;
1001                         local->ps_sdata = found;
1002                 }
1003         } else {
1004                 local->ps_sdata = NULL;
1005         }
1006
1007         ieee80211_change_ps(local);
1008 }
1009
1010 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1011 {
1012         struct ieee80211_local *local =
1013                 container_of(work, struct ieee80211_local,
1014                              dynamic_ps_disable_work);
1015
1016         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1017                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1018                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1019         }
1020
1021         ieee80211_wake_queues_by_reason(&local->hw,
1022                                         IEEE80211_QUEUE_STOP_REASON_PS);
1023 }
1024
1025 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1026 {
1027         struct ieee80211_local *local =
1028                 container_of(work, struct ieee80211_local,
1029                              dynamic_ps_enable_work);
1030         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1031         struct ieee80211_if_managed *ifmgd;
1032         unsigned long flags;
1033         int q;
1034
1035         /* can only happen when PS was just disabled anyway */
1036         if (!sdata)
1037                 return;
1038
1039         ifmgd = &sdata->u.mgd;
1040
1041         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1042                 return;
1043
1044         if (!local->disable_dynamic_ps &&
1045             local->hw.conf.dynamic_ps_timeout > 0) {
1046                 /* don't enter PS if TX frames are pending */
1047                 if (drv_tx_frames_pending(local)) {
1048                         mod_timer(&local->dynamic_ps_timer, jiffies +
1049                                   msecs_to_jiffies(
1050                                   local->hw.conf.dynamic_ps_timeout));
1051                         return;
1052                 }
1053
1054                 /*
1055                  * transmission can be stopped by others which leads to
1056                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1057                  * is not the actual idle state.
1058                  */
1059                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1060                 for (q = 0; q < local->hw.queues; q++) {
1061                         if (local->queue_stop_reasons[q]) {
1062                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1063                                                        flags);
1064                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1065                                           msecs_to_jiffies(
1066                                           local->hw.conf.dynamic_ps_timeout));
1067                                 return;
1068                         }
1069                 }
1070                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1071         }
1072
1073         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1074             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1075                 netif_tx_stop_all_queues(sdata->dev);
1076
1077                 if (drv_tx_frames_pending(local))
1078                         mod_timer(&local->dynamic_ps_timer, jiffies +
1079                                   msecs_to_jiffies(
1080                                   local->hw.conf.dynamic_ps_timeout));
1081                 else {
1082                         ieee80211_send_nullfunc(local, sdata, 1);
1083                         /* Flush to get the tx status of nullfunc frame */
1084                         drv_flush(local, false);
1085                 }
1086         }
1087
1088         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1089               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1090             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1091                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1092                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1093                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1094         }
1095
1096         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1097                 netif_tx_wake_all_queues(sdata->dev);
1098 }
1099
1100 void ieee80211_dynamic_ps_timer(unsigned long data)
1101 {
1102         struct ieee80211_local *local = (void *) data;
1103
1104         if (local->quiescing || local->suspended)
1105                 return;
1106
1107         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1108 }
1109
1110 /* MLME */
1111 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1112                                      struct ieee80211_sub_if_data *sdata,
1113                                      u8 *wmm_param, size_t wmm_param_len)
1114 {
1115         struct ieee80211_tx_queue_params params;
1116         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1117         size_t left;
1118         int count;
1119         u8 *pos, uapsd_queues = 0;
1120
1121         if (!local->ops->conf_tx)
1122                 return false;
1123
1124         if (local->hw.queues < IEEE80211_NUM_ACS)
1125                 return false;
1126
1127         if (!wmm_param)
1128                 return false;
1129
1130         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1131                 return false;
1132
1133         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1134                 uapsd_queues = ifmgd->uapsd_queues;
1135
1136         count = wmm_param[6] & 0x0f;
1137         if (count == ifmgd->wmm_last_param_set)
1138                 return false;
1139         ifmgd->wmm_last_param_set = count;
1140
1141         pos = wmm_param + 8;
1142         left = wmm_param_len - 8;
1143
1144         memset(&params, 0, sizeof(params));
1145
1146         sdata->wmm_acm = 0;
1147         for (; left >= 4; left -= 4, pos += 4) {
1148                 int aci = (pos[0] >> 5) & 0x03;
1149                 int acm = (pos[0] >> 4) & 0x01;
1150                 bool uapsd = false;
1151                 int queue;
1152
1153                 switch (aci) {
1154                 case 1: /* AC_BK */
1155                         queue = 3;
1156                         if (acm)
1157                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1158                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1159                                 uapsd = true;
1160                         break;
1161                 case 2: /* AC_VI */
1162                         queue = 1;
1163                         if (acm)
1164                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1165                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1166                                 uapsd = true;
1167                         break;
1168                 case 3: /* AC_VO */
1169                         queue = 0;
1170                         if (acm)
1171                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1172                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1173                                 uapsd = true;
1174                         break;
1175                 case 0: /* AC_BE */
1176                 default:
1177                         queue = 2;
1178                         if (acm)
1179                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1180                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1181                                 uapsd = true;
1182                         break;
1183                 }
1184
1185                 params.aifs = pos[0] & 0x0f;
1186                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1187                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1188                 params.txop = get_unaligned_le16(pos + 2);
1189                 params.uapsd = uapsd;
1190
1191                 mlme_dbg(sdata,
1192                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1193                          queue, aci, acm,
1194                          params.aifs, params.cw_min, params.cw_max,
1195                          params.txop, params.uapsd);
1196                 sdata->tx_conf[queue] = params;
1197                 if (drv_conf_tx(local, sdata, queue, &params))
1198                         sdata_err(sdata,
1199                                   "failed to set TX queue parameters for queue %d\n",
1200                                   queue);
1201         }
1202
1203         /* enable WMM or activate new settings */
1204         sdata->vif.bss_conf.qos = true;
1205         return true;
1206 }
1207
1208 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1209 {
1210         lockdep_assert_held(&sdata->local->mtx);
1211
1212         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1213                                 IEEE80211_STA_BEACON_POLL);
1214         ieee80211_run_deferred_scan(sdata->local);
1215 }
1216
1217 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1218 {
1219         mutex_lock(&sdata->local->mtx);
1220         __ieee80211_stop_poll(sdata);
1221         mutex_unlock(&sdata->local->mtx);
1222 }
1223
1224 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1225                                            u16 capab, bool erp_valid, u8 erp)
1226 {
1227         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1228         u32 changed = 0;
1229         bool use_protection;
1230         bool use_short_preamble;
1231         bool use_short_slot;
1232
1233         if (erp_valid) {
1234                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1235                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1236         } else {
1237                 use_protection = false;
1238                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1239         }
1240
1241         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1242         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1243                 use_short_slot = true;
1244
1245         if (use_protection != bss_conf->use_cts_prot) {
1246                 bss_conf->use_cts_prot = use_protection;
1247                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1248         }
1249
1250         if (use_short_preamble != bss_conf->use_short_preamble) {
1251                 bss_conf->use_short_preamble = use_short_preamble;
1252                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1253         }
1254
1255         if (use_short_slot != bss_conf->use_short_slot) {
1256                 bss_conf->use_short_slot = use_short_slot;
1257                 changed |= BSS_CHANGED_ERP_SLOT;
1258         }
1259
1260         return changed;
1261 }
1262
1263 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1264                                      struct cfg80211_bss *cbss,
1265                                      u32 bss_info_changed)
1266 {
1267         struct ieee80211_bss *bss = (void *)cbss->priv;
1268         struct ieee80211_local *local = sdata->local;
1269         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1270
1271         bss_info_changed |= BSS_CHANGED_ASSOC;
1272         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1273                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1274
1275         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1276                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1277
1278         sdata->u.mgd.associated = cbss;
1279         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1280
1281         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1282
1283         /* just to be sure */
1284         ieee80211_stop_poll(sdata);
1285
1286         ieee80211_led_assoc(local, 1);
1287
1288         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1289                 bss_conf->dtim_period = bss->dtim_period;
1290         else
1291                 bss_conf->dtim_period = 0;
1292
1293         bss_conf->assoc = 1;
1294
1295         /* Tell the driver to monitor connection quality (if supported) */
1296         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1297             bss_conf->cqm_rssi_thold)
1298                 bss_info_changed |= BSS_CHANGED_CQM;
1299
1300         /* Enable ARP filtering */
1301         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1302                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1303                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1304         }
1305
1306         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1307
1308         mutex_lock(&local->iflist_mtx);
1309         ieee80211_recalc_ps(local, -1);
1310         ieee80211_recalc_smps(local);
1311         mutex_unlock(&local->iflist_mtx);
1312
1313         netif_tx_start_all_queues(sdata->dev);
1314         netif_carrier_on(sdata->dev);
1315 }
1316
1317 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1318                                    u16 stype, u16 reason, bool tx,
1319                                    u8 *frame_buf)
1320 {
1321         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1322         struct ieee80211_local *local = sdata->local;
1323         struct sta_info *sta;
1324         u32 changed = 0;
1325         u8 bssid[ETH_ALEN];
1326
1327         ASSERT_MGD_MTX(ifmgd);
1328
1329         if (WARN_ON_ONCE(tx && !frame_buf))
1330                 return;
1331
1332         if (WARN_ON(!ifmgd->associated))
1333                 return;
1334
1335         ieee80211_stop_poll(sdata);
1336
1337         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1338
1339         ifmgd->associated = NULL;
1340         memset(ifmgd->bssid, 0, ETH_ALEN);
1341
1342         /*
1343          * we need to commit the associated = NULL change because the
1344          * scan code uses that to determine whether this iface should
1345          * go to/wake up from powersave or not -- and could otherwise
1346          * wake the queues erroneously.
1347          */
1348         smp_mb();
1349
1350         /*
1351          * Thus, we can only afterwards stop the queues -- to account
1352          * for the case where another CPU is finishing a scan at this
1353          * time -- we don't want the scan code to enable queues.
1354          */
1355
1356         netif_tx_stop_all_queues(sdata->dev);
1357         netif_carrier_off(sdata->dev);
1358
1359         mutex_lock(&local->sta_mtx);
1360         sta = sta_info_get(sdata, bssid);
1361         if (sta) {
1362                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1363                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1364         }
1365         mutex_unlock(&local->sta_mtx);
1366
1367         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1368         if (tx)
1369                 drv_flush(local, false);
1370
1371         /* deauthenticate/disassociate now */
1372         if (tx || frame_buf)
1373                 ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason,
1374                                                tx, frame_buf);
1375
1376         /* flush out frame */
1377         if (tx)
1378                 drv_flush(local, false);
1379
1380         /* remove AP and TDLS peers */
1381         sta_info_flush(local, sdata);
1382
1383         /* finally reset all BSS / config parameters */
1384         changed |= ieee80211_reset_erp_info(sdata);
1385
1386         ieee80211_led_assoc(local, 0);
1387         changed |= BSS_CHANGED_ASSOC;
1388         sdata->vif.bss_conf.assoc = false;
1389
1390         /* on the next assoc, re-program HT parameters */
1391         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1392         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1393
1394         local->power_constr_level = 0;
1395
1396         del_timer_sync(&local->dynamic_ps_timer);
1397         cancel_work_sync(&local->dynamic_ps_enable_work);
1398
1399         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1400                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1401                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1402         }
1403         local->ps_sdata = NULL;
1404
1405         /* Disable ARP filtering */
1406         if (sdata->vif.bss_conf.arp_filter_enabled) {
1407                 sdata->vif.bss_conf.arp_filter_enabled = false;
1408                 changed |= BSS_CHANGED_ARP_FILTER;
1409         }
1410
1411         sdata->vif.bss_conf.qos = false;
1412         changed |= BSS_CHANGED_QOS;
1413
1414         /* The BSSID (not really interesting) and HT changed */
1415         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1416         ieee80211_bss_info_change_notify(sdata, changed);
1417
1418         /* channel(_type) changes are handled by ieee80211_hw_config */
1419         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1420         ieee80211_hw_config(local, 0);
1421
1422         /* disassociated - set to defaults now */
1423         ieee80211_set_wmm_default(sdata, false);
1424
1425         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1426         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1427         del_timer_sync(&sdata->u.mgd.timer);
1428         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1429 }
1430
1431 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1432                              struct ieee80211_hdr *hdr)
1433 {
1434         /*
1435          * We can postpone the mgd.timer whenever receiving unicast frames
1436          * from AP because we know that the connection is working both ways
1437          * at that time. But multicast frames (and hence also beacons) must
1438          * be ignored here, because we need to trigger the timer during
1439          * data idle periods for sending the periodic probe request to the
1440          * AP we're connected to.
1441          */
1442         if (is_multicast_ether_addr(hdr->addr1))
1443                 return;
1444
1445         ieee80211_sta_reset_conn_monitor(sdata);
1446 }
1447
1448 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1449 {
1450         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1451         struct ieee80211_local *local = sdata->local;
1452
1453         mutex_lock(&local->mtx);
1454         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1455                               IEEE80211_STA_CONNECTION_POLL))) {
1456                 mutex_unlock(&local->mtx);
1457                 return;
1458         }
1459
1460         __ieee80211_stop_poll(sdata);
1461
1462         mutex_lock(&local->iflist_mtx);
1463         ieee80211_recalc_ps(local, -1);
1464         mutex_unlock(&local->iflist_mtx);
1465
1466         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1467                 goto out;
1468
1469         /*
1470          * We've received a probe response, but are not sure whether
1471          * we have or will be receiving any beacons or data, so let's
1472          * schedule the timers again, just in case.
1473          */
1474         ieee80211_sta_reset_beacon_monitor(sdata);
1475
1476         mod_timer(&ifmgd->conn_mon_timer,
1477                   round_jiffies_up(jiffies +
1478                                    IEEE80211_CONNECTION_IDLE_TIME));
1479 out:
1480         mutex_unlock(&local->mtx);
1481 }
1482
1483 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1484                              struct ieee80211_hdr *hdr, bool ack)
1485 {
1486         if (!ieee80211_is_data(hdr->frame_control))
1487             return;
1488
1489         if (ack)
1490                 ieee80211_sta_reset_conn_monitor(sdata);
1491
1492         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1493             sdata->u.mgd.probe_send_count > 0) {
1494                 if (ack)
1495                         sdata->u.mgd.probe_send_count = 0;
1496                 else
1497                         sdata->u.mgd.nullfunc_failed = true;
1498                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1499         }
1500 }
1501
1502 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1503 {
1504         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1505         const u8 *ssid;
1506         u8 *dst = ifmgd->associated->bssid;
1507         u8 unicast_limit = max(1, max_probe_tries - 3);
1508
1509         /*
1510          * Try sending broadcast probe requests for the last three
1511          * probe requests after the first ones failed since some
1512          * buggy APs only support broadcast probe requests.
1513          */
1514         if (ifmgd->probe_send_count >= unicast_limit)
1515                 dst = NULL;
1516
1517         /*
1518          * When the hardware reports an accurate Tx ACK status, it's
1519          * better to send a nullfunc frame instead of a probe request,
1520          * as it will kick us off the AP quickly if we aren't associated
1521          * anymore. The timeout will be reset if the frame is ACKed by
1522          * the AP.
1523          */
1524         ifmgd->probe_send_count++;
1525
1526         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1527                 ifmgd->nullfunc_failed = false;
1528                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1529         } else {
1530                 int ssid_len;
1531
1532                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1533                 if (WARN_ON_ONCE(ssid == NULL))
1534                         ssid_len = 0;
1535                 else
1536                         ssid_len = ssid[1];
1537
1538                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1539                                          0, (u32) -1, true, false);
1540         }
1541
1542         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1543         run_again(ifmgd, ifmgd->probe_timeout);
1544         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1545                 drv_flush(sdata->local, false);
1546 }
1547
1548 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1549                                    bool beacon)
1550 {
1551         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1552         bool already = false;
1553
1554         if (!ieee80211_sdata_running(sdata))
1555                 return;
1556
1557         mutex_lock(&ifmgd->mtx);
1558
1559         if (!ifmgd->associated)
1560                 goto out;
1561
1562         mutex_lock(&sdata->local->mtx);
1563
1564         if (sdata->local->tmp_channel || sdata->local->scanning) {
1565                 mutex_unlock(&sdata->local->mtx);
1566                 goto out;
1567         }
1568
1569         if (beacon)
1570                 mlme_dbg_ratelimited(sdata,
1571                                      "detected beacon loss from AP - sending probe request\n");
1572
1573         ieee80211_cqm_rssi_notify(&sdata->vif,
1574                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1575
1576         /*
1577          * The driver/our work has already reported this event or the
1578          * connection monitoring has kicked in and we have already sent
1579          * a probe request. Or maybe the AP died and the driver keeps
1580          * reporting until we disassociate...
1581          *
1582          * In either case we have to ignore the current call to this
1583          * function (except for setting the correct probe reason bit)
1584          * because otherwise we would reset the timer every time and
1585          * never check whether we received a probe response!
1586          */
1587         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1588                             IEEE80211_STA_CONNECTION_POLL))
1589                 already = true;
1590
1591         if (beacon)
1592                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1593         else
1594                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1595
1596         mutex_unlock(&sdata->local->mtx);
1597
1598         if (already)
1599                 goto out;
1600
1601         mutex_lock(&sdata->local->iflist_mtx);
1602         ieee80211_recalc_ps(sdata->local, -1);
1603         mutex_unlock(&sdata->local->iflist_mtx);
1604
1605         ifmgd->probe_send_count = 0;
1606         ieee80211_mgd_probe_ap_send(sdata);
1607  out:
1608         mutex_unlock(&ifmgd->mtx);
1609 }
1610
1611 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1612                                           struct ieee80211_vif *vif)
1613 {
1614         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1615         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1616         struct cfg80211_bss *cbss;
1617         struct sk_buff *skb;
1618         const u8 *ssid;
1619         int ssid_len;
1620
1621         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1622                 return NULL;
1623
1624         ASSERT_MGD_MTX(ifmgd);
1625
1626         if (ifmgd->associated)
1627                 cbss = ifmgd->associated;
1628         else if (ifmgd->auth_data)
1629                 cbss = ifmgd->auth_data->bss;
1630         else if (ifmgd->assoc_data)
1631                 cbss = ifmgd->assoc_data->bss;
1632         else
1633                 return NULL;
1634
1635         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1636         if (WARN_ON_ONCE(ssid == NULL))
1637                 ssid_len = 0;
1638         else
1639                 ssid_len = ssid[1];
1640
1641         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1642                                         (u32) -1, ssid + 2, ssid_len,
1643                                         NULL, 0, true);
1644
1645         return skb;
1646 }
1647 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1648
1649 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1650 {
1651         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1652         struct ieee80211_local *local = sdata->local;
1653         u8 bssid[ETH_ALEN];
1654         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1655
1656         mutex_lock(&ifmgd->mtx);
1657         if (!ifmgd->associated) {
1658                 mutex_unlock(&ifmgd->mtx);
1659                 return;
1660         }
1661
1662         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1663
1664         sdata_info(sdata, "Connection to AP %pM lost\n", bssid);
1665
1666         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1667                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1668                                false, frame_buf);
1669         mutex_unlock(&ifmgd->mtx);
1670
1671         /*
1672          * must be outside lock due to cfg80211,
1673          * but that's not a problem.
1674          */
1675         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1676
1677         mutex_lock(&local->mtx);
1678         ieee80211_recalc_idle(local);
1679         mutex_unlock(&local->mtx);
1680 }
1681
1682 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1683 {
1684         struct ieee80211_sub_if_data *sdata =
1685                 container_of(work, struct ieee80211_sub_if_data,
1686                              u.mgd.beacon_connection_loss_work);
1687         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1688         struct sta_info *sta;
1689
1690         if (ifmgd->associated) {
1691                 rcu_read_lock();
1692                 sta = sta_info_get(sdata, ifmgd->bssid);
1693                 if (sta)
1694                         sta->beacon_loss_count++;
1695                 rcu_read_unlock();
1696         }
1697
1698         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1699                 __ieee80211_connection_loss(sdata);
1700         else
1701                 ieee80211_mgd_probe_ap(sdata, true);
1702 }
1703
1704 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1705 {
1706         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1707         struct ieee80211_hw *hw = &sdata->local->hw;
1708
1709         trace_api_beacon_loss(sdata);
1710
1711         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1712         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1713 }
1714 EXPORT_SYMBOL(ieee80211_beacon_loss);
1715
1716 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1717 {
1718         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1719         struct ieee80211_hw *hw = &sdata->local->hw;
1720
1721         trace_api_connection_loss(sdata);
1722
1723         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1724         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1725 }
1726 EXPORT_SYMBOL(ieee80211_connection_loss);
1727
1728
1729 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1730                                         bool assoc)
1731 {
1732         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1733
1734         lockdep_assert_held(&sdata->u.mgd.mtx);
1735
1736         if (!assoc) {
1737                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1738
1739                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1740                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1741         }
1742
1743         cfg80211_put_bss(auth_data->bss);
1744         kfree(auth_data);
1745         sdata->u.mgd.auth_data = NULL;
1746 }
1747
1748 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1749                                      struct ieee80211_mgmt *mgmt, size_t len)
1750 {
1751         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1752         u8 *pos;
1753         struct ieee802_11_elems elems;
1754
1755         pos = mgmt->u.auth.variable;
1756         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1757         if (!elems.challenge)
1758                 return;
1759         auth_data->expected_transaction = 4;
1760         drv_mgd_prepare_tx(sdata->local, sdata);
1761         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1762                             elems.challenge - 2, elems.challenge_len + 2,
1763                             auth_data->bss->bssid, auth_data->bss->bssid,
1764                             auth_data->key, auth_data->key_len,
1765                             auth_data->key_idx);
1766 }
1767
1768 static enum rx_mgmt_action __must_check
1769 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1770                        struct ieee80211_mgmt *mgmt, size_t len)
1771 {
1772         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1773         u8 bssid[ETH_ALEN];
1774         u16 auth_alg, auth_transaction, status_code;
1775         struct sta_info *sta;
1776
1777         lockdep_assert_held(&ifmgd->mtx);
1778
1779         if (len < 24 + 6)
1780                 return RX_MGMT_NONE;
1781
1782         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1783                 return RX_MGMT_NONE;
1784
1785         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1786
1787         if (!ether_addr_equal(bssid, mgmt->bssid))
1788                 return RX_MGMT_NONE;
1789
1790         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1791         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1792         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1793
1794         if (auth_alg != ifmgd->auth_data->algorithm ||
1795             auth_transaction != ifmgd->auth_data->expected_transaction)
1796                 return RX_MGMT_NONE;
1797
1798         if (status_code != WLAN_STATUS_SUCCESS) {
1799                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1800                            mgmt->sa, status_code);
1801                 ieee80211_destroy_auth_data(sdata, false);
1802                 return RX_MGMT_CFG80211_RX_AUTH;
1803         }
1804
1805         switch (ifmgd->auth_data->algorithm) {
1806         case WLAN_AUTH_OPEN:
1807         case WLAN_AUTH_LEAP:
1808         case WLAN_AUTH_FT:
1809                 break;
1810         case WLAN_AUTH_SHARED_KEY:
1811                 if (ifmgd->auth_data->expected_transaction != 4) {
1812                         ieee80211_auth_challenge(sdata, mgmt, len);
1813                         /* need another frame */
1814                         return RX_MGMT_NONE;
1815                 }
1816                 break;
1817         default:
1818                 WARN_ONCE(1, "invalid auth alg %d",
1819                           ifmgd->auth_data->algorithm);
1820                 return RX_MGMT_NONE;
1821         }
1822
1823         sdata_info(sdata, "authenticated\n");
1824         ifmgd->auth_data->done = true;
1825         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1826         run_again(ifmgd, ifmgd->auth_data->timeout);
1827
1828         /* move station state to auth */
1829         mutex_lock(&sdata->local->sta_mtx);
1830         sta = sta_info_get(sdata, bssid);
1831         if (!sta) {
1832                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1833                 goto out_err;
1834         }
1835         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1836                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1837                 goto out_err;
1838         }
1839         mutex_unlock(&sdata->local->sta_mtx);
1840
1841         return RX_MGMT_CFG80211_RX_AUTH;
1842  out_err:
1843         mutex_unlock(&sdata->local->sta_mtx);
1844         /* ignore frame -- wait for timeout */
1845         return RX_MGMT_NONE;
1846 }
1847
1848
1849 static enum rx_mgmt_action __must_check
1850 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1851                          struct ieee80211_mgmt *mgmt, size_t len)
1852 {
1853         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1854         const u8 *bssid = NULL;
1855         u16 reason_code;
1856
1857         lockdep_assert_held(&ifmgd->mtx);
1858
1859         if (len < 24 + 2)
1860                 return RX_MGMT_NONE;
1861
1862         if (!ifmgd->associated ||
1863             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1864                 return RX_MGMT_NONE;
1865
1866         bssid = ifmgd->associated->bssid;
1867
1868         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1869
1870         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1871                    bssid, reason_code);
1872
1873         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1874
1875         mutex_lock(&sdata->local->mtx);
1876         ieee80211_recalc_idle(sdata->local);
1877         mutex_unlock(&sdata->local->mtx);
1878
1879         return RX_MGMT_CFG80211_DEAUTH;
1880 }
1881
1882
1883 static enum rx_mgmt_action __must_check
1884 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1885                            struct ieee80211_mgmt *mgmt, size_t len)
1886 {
1887         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1888         u16 reason_code;
1889
1890         lockdep_assert_held(&ifmgd->mtx);
1891
1892         if (len < 24 + 2)
1893                 return RX_MGMT_NONE;
1894
1895         if (!ifmgd->associated ||
1896             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1897                 return RX_MGMT_NONE;
1898
1899         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1900
1901         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1902                    mgmt->sa, reason_code);
1903
1904         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1905
1906         mutex_lock(&sdata->local->mtx);
1907         ieee80211_recalc_idle(sdata->local);
1908         mutex_unlock(&sdata->local->mtx);
1909
1910         return RX_MGMT_CFG80211_DISASSOC;
1911 }
1912
1913 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1914                                 u8 *supp_rates, unsigned int supp_rates_len,
1915                                 u32 *rates, u32 *basic_rates,
1916                                 bool *have_higher_than_11mbit,
1917                                 int *min_rate, int *min_rate_index)
1918 {
1919         int i, j;
1920
1921         for (i = 0; i < supp_rates_len; i++) {
1922                 int rate = (supp_rates[i] & 0x7f) * 5;
1923                 bool is_basic = !!(supp_rates[i] & 0x80);
1924
1925                 if (rate > 110)
1926                         *have_higher_than_11mbit = true;
1927
1928                 /*
1929                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1930                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1931                  *
1932                  * Note: Even through the membership selector and the basic
1933                  *       rate flag share the same bit, they are not exactly
1934                  *       the same.
1935                  */
1936                 if (!!(supp_rates[i] & 0x80) &&
1937                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1938                         continue;
1939
1940                 for (j = 0; j < sband->n_bitrates; j++) {
1941                         if (sband->bitrates[j].bitrate == rate) {
1942                                 *rates |= BIT(j);
1943                                 if (is_basic)
1944                                         *basic_rates |= BIT(j);
1945                                 if (rate < *min_rate) {
1946                                         *min_rate = rate;
1947                                         *min_rate_index = j;
1948                                 }
1949                                 break;
1950                         }
1951                 }
1952         }
1953 }
1954
1955 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1956                                          bool assoc)
1957 {
1958         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1959
1960         lockdep_assert_held(&sdata->u.mgd.mtx);
1961
1962         if (!assoc) {
1963                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1964
1965                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1966                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1967         }
1968
1969         kfree(assoc_data);
1970         sdata->u.mgd.assoc_data = NULL;
1971 }
1972
1973 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1974                                     struct cfg80211_bss *cbss,
1975                                     struct ieee80211_mgmt *mgmt, size_t len)
1976 {
1977         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1978         struct ieee80211_local *local = sdata->local;
1979         struct ieee80211_supported_band *sband;
1980         struct sta_info *sta;
1981         u8 *pos;
1982         u16 capab_info, aid;
1983         struct ieee802_11_elems elems;
1984         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1985         u32 changed = 0;
1986         int err;
1987
1988         /* AssocResp and ReassocResp have identical structure */
1989
1990         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1991         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1992
1993         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1994                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
1995                            aid);
1996         aid &= ~(BIT(15) | BIT(14));
1997
1998         ifmgd->broken_ap = false;
1999
2000         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2001                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2002                            aid);
2003                 aid = 0;
2004                 ifmgd->broken_ap = true;
2005         }
2006
2007         pos = mgmt->u.assoc_resp.variable;
2008         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2009
2010         if (!elems.supp_rates) {
2011                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2012                 return false;
2013         }
2014
2015         ifmgd->aid = aid;
2016
2017         mutex_lock(&sdata->local->sta_mtx);
2018         /*
2019          * station info was already allocated and inserted before
2020          * the association and should be available to us
2021          */
2022         sta = sta_info_get(sdata, cbss->bssid);
2023         if (WARN_ON(!sta)) {
2024                 mutex_unlock(&sdata->local->sta_mtx);
2025                 return false;
2026         }
2027
2028         sband = local->hw.wiphy->bands[local->oper_channel->band];
2029
2030         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2031                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2032                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2033
2034         sta->supports_40mhz =
2035                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2036
2037         rate_control_rate_init(sta);
2038
2039         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2040                 set_sta_flag(sta, WLAN_STA_MFP);
2041
2042         if (elems.wmm_param)
2043                 set_sta_flag(sta, WLAN_STA_WME);
2044
2045         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2046         if (!err)
2047                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2048         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2049                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2050         if (err) {
2051                 sdata_info(sdata,
2052                            "failed to move station %pM to desired state\n",
2053                            sta->sta.addr);
2054                 WARN_ON(__sta_info_destroy(sta));
2055                 mutex_unlock(&sdata->local->sta_mtx);
2056                 return false;
2057         }
2058
2059         mutex_unlock(&sdata->local->sta_mtx);
2060
2061         /*
2062          * Always handle WMM once after association regardless
2063          * of the first value the AP uses. Setting -1 here has
2064          * that effect because the AP values is an unsigned
2065          * 4-bit value.
2066          */
2067         ifmgd->wmm_last_param_set = -1;
2068
2069         if (elems.wmm_param)
2070                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2071                                          elems.wmm_param_len);
2072         else
2073                 ieee80211_set_wmm_default(sdata, false);
2074         changed |= BSS_CHANGED_QOS;
2075
2076         if (elems.ht_operation && elems.wmm_param &&
2077             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2078                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2079                                                   cbss->bssid, false);
2080
2081         /* set AID and assoc capability,
2082          * ieee80211_set_associated() will tell the driver */
2083         bss_conf->aid = aid;
2084         bss_conf->assoc_capability = capab_info;
2085         ieee80211_set_associated(sdata, cbss, changed);
2086
2087         /*
2088          * If we're using 4-addr mode, let the AP know that we're
2089          * doing so, so that it can create the STA VLAN on its side
2090          */
2091         if (ifmgd->use_4addr)
2092                 ieee80211_send_4addr_nullfunc(local, sdata);
2093
2094         /*
2095          * Start timer to probe the connection to the AP now.
2096          * Also start the timer that will detect beacon loss.
2097          */
2098         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2099         ieee80211_sta_reset_beacon_monitor(sdata);
2100
2101         return true;
2102 }
2103
2104 static enum rx_mgmt_action __must_check
2105 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2106                              struct ieee80211_mgmt *mgmt, size_t len,
2107                              struct cfg80211_bss **bss)
2108 {
2109         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2110         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2111         u16 capab_info, status_code, aid;
2112         struct ieee802_11_elems elems;
2113         u8 *pos;
2114         bool reassoc;
2115
2116         lockdep_assert_held(&ifmgd->mtx);
2117
2118         if (!assoc_data)
2119                 return RX_MGMT_NONE;
2120         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2121                 return RX_MGMT_NONE;
2122
2123         /*
2124          * AssocResp and ReassocResp have identical structure, so process both
2125          * of them in this function.
2126          */
2127
2128         if (len < 24 + 6)
2129                 return RX_MGMT_NONE;
2130
2131         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2132         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2133         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2134         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2135
2136         sdata_info(sdata,
2137                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2138                    reassoc ? "Rea" : "A", mgmt->sa,
2139                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2140
2141         pos = mgmt->u.assoc_resp.variable;
2142         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2143
2144         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2145             elems.timeout_int && elems.timeout_int_len == 5 &&
2146             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2147                 u32 tu, ms;
2148                 tu = get_unaligned_le32(elems.timeout_int + 1);
2149                 ms = tu * 1024 / 1000;
2150                 sdata_info(sdata,
2151                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2152                            mgmt->sa, tu, ms);
2153                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2154                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2155                         run_again(ifmgd, assoc_data->timeout);
2156                 return RX_MGMT_NONE;
2157         }
2158
2159         *bss = assoc_data->bss;
2160
2161         if (status_code != WLAN_STATUS_SUCCESS) {
2162                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2163                            mgmt->sa, status_code);
2164                 ieee80211_destroy_assoc_data(sdata, false);
2165         } else {
2166                 sdata_info(sdata, "associated\n");
2167
2168                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2169                         /* oops -- internal error -- send timeout for now */
2170                         ieee80211_destroy_assoc_data(sdata, true);
2171                         sta_info_destroy_addr(sdata, mgmt->bssid);
2172                         cfg80211_put_bss(*bss);
2173                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2174                 }
2175
2176                 /*
2177                  * destroy assoc_data afterwards, as otherwise an idle
2178                  * recalc after assoc_data is NULL but before associated
2179                  * is set can cause the interface to go idle
2180                  */
2181                 ieee80211_destroy_assoc_data(sdata, true);
2182         }
2183
2184         return RX_MGMT_CFG80211_RX_ASSOC;
2185 }
2186 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2187                                   struct ieee80211_mgmt *mgmt,
2188                                   size_t len,
2189                                   struct ieee80211_rx_status *rx_status,
2190                                   struct ieee802_11_elems *elems,
2191                                   bool beacon)
2192 {
2193         struct ieee80211_local *local = sdata->local;
2194         int freq;
2195         struct ieee80211_bss *bss;
2196         struct ieee80211_channel *channel;
2197         bool need_ps = false;
2198
2199         if (sdata->u.mgd.associated &&
2200             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2201                 bss = (void *)sdata->u.mgd.associated->priv;
2202                 /* not previously set so we may need to recalc */
2203                 need_ps = !bss->dtim_period;
2204         }
2205
2206         if (elems->ds_params && elems->ds_params_len == 1)
2207                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2208                                                       rx_status->band);
2209         else
2210                 freq = rx_status->freq;
2211
2212         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2213
2214         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2215                 return;
2216
2217         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2218                                         channel, beacon);
2219         if (bss)
2220                 ieee80211_rx_bss_put(local, bss);
2221
2222         if (!sdata->u.mgd.associated)
2223                 return;
2224
2225         if (need_ps) {
2226                 mutex_lock(&local->iflist_mtx);
2227                 ieee80211_recalc_ps(local, -1);
2228                 mutex_unlock(&local->iflist_mtx);
2229         }
2230
2231         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2232             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2233                                                         ETH_ALEN) == 0)) {
2234                 struct ieee80211_channel_sw_ie *sw_elem =
2235                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2236                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2237                                                  bss, rx_status->mactime);
2238         }
2239 }
2240
2241
2242 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2243                                          struct sk_buff *skb)
2244 {
2245         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2246         struct ieee80211_if_managed *ifmgd;
2247         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2248         size_t baselen, len = skb->len;
2249         struct ieee802_11_elems elems;
2250
2251         ifmgd = &sdata->u.mgd;
2252
2253         ASSERT_MGD_MTX(ifmgd);
2254
2255         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2256                 return; /* ignore ProbeResp to foreign address */
2257
2258         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2259         if (baselen > len)
2260                 return;
2261
2262         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2263                                 &elems);
2264
2265         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2266
2267         if (ifmgd->associated &&
2268             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2269                 ieee80211_reset_ap_probe(sdata);
2270
2271         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2272             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2273                 /* got probe response, continue with auth */
2274                 sdata_info(sdata, "direct probe responded\n");
2275                 ifmgd->auth_data->tries = 0;
2276                 ifmgd->auth_data->timeout = jiffies;
2277                 run_again(ifmgd, ifmgd->auth_data->timeout);
2278         }
2279 }
2280
2281 /*
2282  * This is the canonical list of information elements we care about,
2283  * the filter code also gives us all changes to the Microsoft OUI
2284  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2285  *
2286  * We implement beacon filtering in software since that means we can
2287  * avoid processing the frame here and in cfg80211, and userspace
2288  * will not be able to tell whether the hardware supports it or not.
2289  *
2290  * XXX: This list needs to be dynamic -- userspace needs to be able to
2291  *      add items it requires. It also needs to be able to tell us to
2292  *      look out for other vendor IEs.
2293  */
2294 static const u64 care_about_ies =
2295         (1ULL << WLAN_EID_COUNTRY) |
2296         (1ULL << WLAN_EID_ERP_INFO) |
2297         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2298         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2299         (1ULL << WLAN_EID_HT_CAPABILITY) |
2300         (1ULL << WLAN_EID_HT_OPERATION);
2301
2302 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2303                                      struct ieee80211_mgmt *mgmt,
2304                                      size_t len,
2305                                      struct ieee80211_rx_status *rx_status)
2306 {
2307         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2308         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2309         size_t baselen;
2310         struct ieee802_11_elems elems;
2311         struct ieee80211_local *local = sdata->local;
2312         u32 changed = 0;
2313         bool erp_valid, directed_tim = false;
2314         u8 erp_value = 0;
2315         u32 ncrc;
2316         u8 *bssid;
2317
2318         lockdep_assert_held(&ifmgd->mtx);
2319
2320         /* Process beacon from the current BSS */
2321         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2322         if (baselen > len)
2323                 return;
2324
2325         if (rx_status->freq != local->hw.conf.channel->center_freq)
2326                 return;
2327
2328         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2329             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2330                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2331                                        len - baselen, &elems);
2332
2333                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2334                                       false);
2335                 ifmgd->assoc_data->have_beacon = true;
2336                 ifmgd->assoc_data->sent_assoc = false;
2337                 /* continue assoc process */
2338                 ifmgd->assoc_data->timeout = jiffies;
2339                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2340                 return;
2341         }
2342
2343         if (!ifmgd->associated ||
2344             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2345                 return;
2346         bssid = ifmgd->associated->bssid;
2347
2348         /* Track average RSSI from the Beacon frames of the current AP */
2349         ifmgd->last_beacon_signal = rx_status->signal;
2350         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2351                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2352                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2353                 ifmgd->last_cqm_event_signal = 0;
2354                 ifmgd->count_beacon_signal = 1;
2355                 ifmgd->last_ave_beacon_signal = 0;
2356         } else {
2357                 ifmgd->ave_beacon_signal =
2358                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2359                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2360                          ifmgd->ave_beacon_signal) / 16;
2361                 ifmgd->count_beacon_signal++;
2362         }
2363
2364         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2365             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2366                 int sig = ifmgd->ave_beacon_signal;
2367                 int last_sig = ifmgd->last_ave_beacon_signal;
2368
2369                 /*
2370                  * if signal crosses either of the boundaries, invoke callback
2371                  * with appropriate parameters
2372                  */
2373                 if (sig > ifmgd->rssi_max_thold &&
2374                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2375                         ifmgd->last_ave_beacon_signal = sig;
2376                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2377                 } else if (sig < ifmgd->rssi_min_thold &&
2378                            (last_sig >= ifmgd->rssi_max_thold ||
2379                            last_sig == 0)) {
2380                         ifmgd->last_ave_beacon_signal = sig;
2381                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2382                 }
2383         }
2384
2385         if (bss_conf->cqm_rssi_thold &&
2386             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2387             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2388                 int sig = ifmgd->ave_beacon_signal / 16;
2389                 int last_event = ifmgd->last_cqm_event_signal;
2390                 int thold = bss_conf->cqm_rssi_thold;
2391                 int hyst = bss_conf->cqm_rssi_hyst;
2392                 if (sig < thold &&
2393                     (last_event == 0 || sig < last_event - hyst)) {
2394                         ifmgd->last_cqm_event_signal = sig;
2395                         ieee80211_cqm_rssi_notify(
2396                                 &sdata->vif,
2397                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2398                                 GFP_KERNEL);
2399                 } else if (sig > thold &&
2400                            (last_event == 0 || sig > last_event + hyst)) {
2401                         ifmgd->last_cqm_event_signal = sig;
2402                         ieee80211_cqm_rssi_notify(
2403                                 &sdata->vif,
2404                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2405                                 GFP_KERNEL);
2406                 }
2407         }
2408
2409         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2410                 mlme_dbg_ratelimited(sdata,
2411                                      "cancelling probereq poll due to a received beacon\n");
2412                 mutex_lock(&local->mtx);
2413                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2414                 ieee80211_run_deferred_scan(local);
2415                 mutex_unlock(&local->mtx);
2416
2417                 mutex_lock(&local->iflist_mtx);
2418                 ieee80211_recalc_ps(local, -1);
2419                 mutex_unlock(&local->iflist_mtx);
2420         }
2421
2422         /*
2423          * Push the beacon loss detection into the future since
2424          * we are processing a beacon from the AP just now.
2425          */
2426         ieee80211_sta_reset_beacon_monitor(sdata);
2427
2428         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2429         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2430                                           len - baselen, &elems,
2431                                           care_about_ies, ncrc);
2432
2433         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2434                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2435                                                    ifmgd->aid);
2436
2437         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2438                 if (directed_tim) {
2439                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2440                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2441                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2442                                         ieee80211_hw_config(local,
2443                                                             IEEE80211_CONF_CHANGE_PS);
2444                                 }
2445                                 ieee80211_send_nullfunc(local, sdata, 0);
2446                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2447                                 local->pspolling = true;
2448
2449                                 /*
2450                                  * Here is assumed that the driver will be
2451                                  * able to send ps-poll frame and receive a
2452                                  * response even though power save mode is
2453                                  * enabled, but some drivers might require
2454                                  * to disable power save here. This needs
2455                                  * to be investigated.
2456                                  */
2457                                 ieee80211_send_pspoll(local, sdata);
2458                         }
2459                 }
2460         }
2461
2462         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2463                 return;
2464         ifmgd->beacon_crc = ncrc;
2465         ifmgd->beacon_crc_valid = true;
2466
2467         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2468                               true);
2469
2470         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2471                                      elems.wmm_param_len))
2472                 changed |= BSS_CHANGED_QOS;
2473
2474         if (elems.erp_info && elems.erp_info_len >= 1) {
2475                 erp_valid = true;
2476                 erp_value = elems.erp_info[0];
2477         } else {
2478                 erp_valid = false;
2479         }
2480         changed |= ieee80211_handle_bss_capability(sdata,
2481                         le16_to_cpu(mgmt->u.beacon.capab_info),
2482                         erp_valid, erp_value);
2483
2484
2485         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2486             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2487                 struct ieee80211_supported_band *sband;
2488
2489                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2490
2491                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2492                                                   bssid, true);
2493         }
2494
2495         /* Note: country IE parsing is done for us by cfg80211 */
2496         if (elems.country_elem) {
2497                 /* TODO: IBSS also needs this */
2498                 if (elems.pwr_constr_elem)
2499                         ieee80211_handle_pwr_constr(sdata,
2500                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2501                                 elems.pwr_constr_elem,
2502                                 elems.pwr_constr_elem_len);
2503         }
2504
2505         ieee80211_bss_info_change_notify(sdata, changed);
2506 }
2507
2508 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2509                                   struct sk_buff *skb)
2510 {
2511         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2512         struct ieee80211_rx_status *rx_status;
2513         struct ieee80211_mgmt *mgmt;
2514         struct cfg80211_bss *bss = NULL;
2515         enum rx_mgmt_action rma = RX_MGMT_NONE;
2516         u16 fc;
2517
2518         rx_status = (struct ieee80211_rx_status *) skb->cb;
2519         mgmt = (struct ieee80211_mgmt *) skb->data;
2520         fc = le16_to_cpu(mgmt->frame_control);
2521
2522         mutex_lock(&ifmgd->mtx);
2523
2524         switch (fc & IEEE80211_FCTL_STYPE) {
2525         case IEEE80211_STYPE_BEACON:
2526                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2527                 break;
2528         case IEEE80211_STYPE_PROBE_RESP:
2529                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2530                 break;
2531         case IEEE80211_STYPE_AUTH:
2532                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2533                 break;
2534         case IEEE80211_STYPE_DEAUTH:
2535                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2536                 break;
2537         case IEEE80211_STYPE_DISASSOC:
2538                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2539                 break;
2540         case IEEE80211_STYPE_ASSOC_RESP:
2541         case IEEE80211_STYPE_REASSOC_RESP:
2542                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2543                 break;
2544         case IEEE80211_STYPE_ACTION:
2545                 switch (mgmt->u.action.category) {
2546                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2547                         ieee80211_sta_process_chanswitch(sdata,
2548                                         &mgmt->u.action.u.chan_switch.sw_elem,
2549                                         (void *)ifmgd->associated->priv,
2550                                         rx_status->mactime);
2551                         break;
2552                 }
2553         }
2554         mutex_unlock(&ifmgd->mtx);
2555
2556         switch (rma) {
2557         case RX_MGMT_NONE:
2558                 /* no action */
2559                 break;
2560         case RX_MGMT_CFG80211_DEAUTH:
2561                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2562                 break;
2563         case RX_MGMT_CFG80211_DISASSOC:
2564                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2565                 break;
2566         case RX_MGMT_CFG80211_RX_AUTH:
2567                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2568                 break;
2569         case RX_MGMT_CFG80211_RX_ASSOC:
2570                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2571                 break;
2572         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2573                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2574                 break;
2575         default:
2576                 WARN(1, "unexpected: %d", rma);
2577         }
2578 }
2579
2580 static void ieee80211_sta_timer(unsigned long data)
2581 {
2582         struct ieee80211_sub_if_data *sdata =
2583                 (struct ieee80211_sub_if_data *) data;
2584         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2585         struct ieee80211_local *local = sdata->local;
2586
2587         if (local->quiescing) {
2588                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2589                 return;
2590         }
2591
2592         ieee80211_queue_work(&local->hw, &sdata->work);
2593 }
2594
2595 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2596                                           u8 *bssid, u8 reason)
2597 {
2598         struct ieee80211_local *local = sdata->local;
2599         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2600         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2601
2602         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2603                                false, frame_buf);
2604         mutex_unlock(&ifmgd->mtx);
2605
2606         /*
2607          * must be outside lock due to cfg80211,
2608          * but that's not a problem.
2609          */
2610         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2611
2612         mutex_lock(&local->mtx);
2613         ieee80211_recalc_idle(local);
2614         mutex_unlock(&local->mtx);
2615
2616         mutex_lock(&ifmgd->mtx);
2617 }
2618
2619 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2620 {
2621         struct ieee80211_local *local = sdata->local;
2622         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2623         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2624
2625         lockdep_assert_held(&ifmgd->mtx);
2626
2627         if (WARN_ON_ONCE(!auth_data))
2628                 return -EINVAL;
2629
2630         auth_data->tries++;
2631
2632         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2633                 sdata_info(sdata, "authentication with %pM timed out\n",
2634                            auth_data->bss->bssid);
2635
2636                 /*
2637                  * Most likely AP is not in the range so remove the
2638                  * bss struct for that AP.
2639                  */
2640                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2641
2642                 return -ETIMEDOUT;
2643         }
2644
2645         drv_mgd_prepare_tx(local, sdata);
2646
2647         if (auth_data->bss->proberesp_ies) {
2648                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2649                            auth_data->bss->bssid, auth_data->tries,
2650                            IEEE80211_AUTH_MAX_TRIES);
2651
2652                 auth_data->expected_transaction = 2;
2653                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2654                                     auth_data->ie, auth_data->ie_len,
2655                                     auth_data->bss->bssid,
2656                                     auth_data->bss->bssid, NULL, 0, 0);
2657         } else {
2658                 const u8 *ssidie;
2659
2660                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2661                            auth_data->bss->bssid, auth_data->tries,
2662                            IEEE80211_AUTH_MAX_TRIES);
2663
2664                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2665                 if (!ssidie)
2666                         return -EINVAL;
2667                 /*
2668                  * Direct probe is sent to broadcast address as some APs
2669                  * will not answer to direct packet in unassociated state.
2670                  */
2671                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2672                                          NULL, 0, (u32) -1, true, false);
2673         }
2674
2675         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2676         run_again(ifmgd, auth_data->timeout);
2677
2678         return 0;
2679 }
2680
2681 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2682 {
2683         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2684         struct ieee80211_local *local = sdata->local;
2685
2686         lockdep_assert_held(&sdata->u.mgd.mtx);
2687
2688         assoc_data->tries++;
2689         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2690                 sdata_info(sdata, "association with %pM timed out\n",
2691                            assoc_data->bss->bssid);
2692
2693                 /*
2694                  * Most likely AP is not in the range so remove the
2695                  * bss struct for that AP.
2696                  */
2697                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2698
2699                 return -ETIMEDOUT;
2700         }
2701
2702         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2703                    assoc_data->bss->bssid, assoc_data->tries,
2704                    IEEE80211_ASSOC_MAX_TRIES);
2705         ieee80211_send_assoc(sdata);
2706
2707         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2708         run_again(&sdata->u.mgd, assoc_data->timeout);
2709
2710         return 0;
2711 }
2712
2713 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2714 {
2715         struct ieee80211_local *local = sdata->local;
2716         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2717
2718         mutex_lock(&ifmgd->mtx);
2719
2720         if (ifmgd->auth_data &&
2721             time_after(jiffies, ifmgd->auth_data->timeout)) {
2722                 if (ifmgd->auth_data->done) {
2723                         /*
2724                          * ok ... we waited for assoc but userspace didn't,
2725                          * so let's just kill the auth data
2726                          */
2727                         ieee80211_destroy_auth_data(sdata, false);
2728                 } else if (ieee80211_probe_auth(sdata)) {
2729                         u8 bssid[ETH_ALEN];
2730
2731                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2732
2733                         ieee80211_destroy_auth_data(sdata, false);
2734
2735                         mutex_unlock(&ifmgd->mtx);
2736                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2737                         mutex_lock(&ifmgd->mtx);
2738                 }
2739         } else if (ifmgd->auth_data)
2740                 run_again(ifmgd, ifmgd->auth_data->timeout);
2741
2742         if (ifmgd->assoc_data &&
2743             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2744                 if (!ifmgd->assoc_data->have_beacon ||
2745                     ieee80211_do_assoc(sdata)) {
2746                         u8 bssid[ETH_ALEN];
2747
2748                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2749
2750                         ieee80211_destroy_assoc_data(sdata, false);
2751
2752                         mutex_unlock(&ifmgd->mtx);
2753                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2754                         mutex_lock(&ifmgd->mtx);
2755                 }
2756         } else if (ifmgd->assoc_data)
2757                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2758
2759         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2760                             IEEE80211_STA_CONNECTION_POLL) &&
2761             ifmgd->associated) {
2762                 u8 bssid[ETH_ALEN];
2763                 int max_tries;
2764
2765                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2766
2767                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2768                         max_tries = max_nullfunc_tries;
2769                 else
2770                         max_tries = max_probe_tries;
2771
2772                 /* ACK received for nullfunc probing frame */
2773                 if (!ifmgd->probe_send_count)
2774                         ieee80211_reset_ap_probe(sdata);
2775                 else if (ifmgd->nullfunc_failed) {
2776                         if (ifmgd->probe_send_count < max_tries) {
2777                                 mlme_dbg(sdata,
2778                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2779                                          bssid, ifmgd->probe_send_count,
2780                                          max_tries);
2781                                 ieee80211_mgd_probe_ap_send(sdata);
2782                         } else {
2783                                 mlme_dbg(sdata,
2784                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2785                                          bssid);
2786                                 ieee80211_sta_connection_lost(sdata, bssid,
2787                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2788                         }
2789                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2790                         run_again(ifmgd, ifmgd->probe_timeout);
2791                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2792                         mlme_dbg(sdata,
2793                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2794                                  bssid, probe_wait_ms);
2795                         ieee80211_sta_connection_lost(sdata, bssid,
2796                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2797                 } else if (ifmgd->probe_send_count < max_tries) {
2798                         mlme_dbg(sdata,
2799                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2800                                  bssid, probe_wait_ms,
2801                                  ifmgd->probe_send_count, max_tries);
2802                         ieee80211_mgd_probe_ap_send(sdata);
2803                 } else {
2804                         /*
2805                          * We actually lost the connection ... or did we?
2806                          * Let's make sure!
2807                          */
2808                         wiphy_debug(local->hw.wiphy,
2809                                     "%s: No probe response from AP %pM"
2810                                     " after %dms, disconnecting.\n",
2811                                     sdata->name,
2812                                     bssid, probe_wait_ms);
2813
2814                         ieee80211_sta_connection_lost(sdata, bssid,
2815                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2816                 }
2817         }
2818
2819         mutex_unlock(&ifmgd->mtx);
2820
2821         mutex_lock(&local->mtx);
2822         ieee80211_recalc_idle(local);
2823         mutex_unlock(&local->mtx);
2824 }
2825
2826 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2827 {
2828         struct ieee80211_sub_if_data *sdata =
2829                 (struct ieee80211_sub_if_data *) data;
2830         struct ieee80211_local *local = sdata->local;
2831
2832         if (local->quiescing)
2833                 return;
2834
2835         ieee80211_queue_work(&sdata->local->hw,
2836                              &sdata->u.mgd.beacon_connection_loss_work);
2837 }
2838
2839 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2840 {
2841         struct ieee80211_sub_if_data *sdata =
2842                 (struct ieee80211_sub_if_data *) data;
2843         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2844         struct ieee80211_local *local = sdata->local;
2845
2846         if (local->quiescing)
2847                 return;
2848
2849         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2850 }
2851
2852 static void ieee80211_sta_monitor_work(struct work_struct *work)
2853 {
2854         struct ieee80211_sub_if_data *sdata =
2855                 container_of(work, struct ieee80211_sub_if_data,
2856                              u.mgd.monitor_work);
2857
2858         ieee80211_mgd_probe_ap(sdata, false);
2859 }
2860
2861 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2862 {
2863         u32 flags;
2864
2865         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2866                 __ieee80211_stop_poll(sdata);
2867
2868                 /* let's probe the connection once */
2869                 flags = sdata->local->hw.flags;
2870                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2871                         ieee80211_queue_work(&sdata->local->hw,
2872                                              &sdata->u.mgd.monitor_work);
2873                 /* and do all the other regular work too */
2874                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2875         }
2876 }
2877
2878 #ifdef CONFIG_PM
2879 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2880 {
2881         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2882
2883         /*
2884          * we need to use atomic bitops for the running bits
2885          * only because both timers might fire at the same
2886          * time -- the code here is properly synchronised.
2887          */
2888
2889         cancel_work_sync(&ifmgd->request_smps_work);
2890
2891         cancel_work_sync(&ifmgd->monitor_work);
2892         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2893         if (del_timer_sync(&ifmgd->timer))
2894                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2895
2896         cancel_work_sync(&ifmgd->chswitch_work);
2897         if (del_timer_sync(&ifmgd->chswitch_timer))
2898                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2899
2900         /* these will just be re-established on connection */
2901         del_timer_sync(&ifmgd->conn_mon_timer);
2902         del_timer_sync(&ifmgd->bcn_mon_timer);
2903 }
2904
2905 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2906 {
2907         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2908
2909         if (!ifmgd->associated)
2910                 return;
2911
2912         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2913                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2914                 mutex_lock(&ifmgd->mtx);
2915                 if (ifmgd->associated) {
2916                         mlme_dbg(sdata,
2917                                  "driver requested disconnect after resume\n");
2918                         ieee80211_sta_connection_lost(sdata,
2919                                 ifmgd->associated->bssid,
2920                                 WLAN_REASON_UNSPECIFIED);
2921                         mutex_unlock(&ifmgd->mtx);
2922                         return;
2923                 }
2924                 mutex_unlock(&ifmgd->mtx);
2925         }
2926
2927         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2928                 add_timer(&ifmgd->timer);
2929         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2930                 add_timer(&ifmgd->chswitch_timer);
2931         ieee80211_sta_reset_beacon_monitor(sdata);
2932
2933         mutex_lock(&sdata->local->mtx);
2934         ieee80211_restart_sta_timer(sdata);
2935         mutex_unlock(&sdata->local->mtx);
2936 }
2937 #endif
2938
2939 /* interface setup */
2940 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2941 {
2942         struct ieee80211_if_managed *ifmgd;
2943
2944         ifmgd = &sdata->u.mgd;
2945         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2946         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2947         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2948                   ieee80211_beacon_connection_loss_work);
2949         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2950         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2951                     (unsigned long) sdata);
2952         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2953                     (unsigned long) sdata);
2954         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2955                     (unsigned long) sdata);
2956         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2957                     (unsigned long) sdata);
2958
2959         ifmgd->flags = 0;
2960         ifmgd->powersave = sdata->wdev.ps;
2961         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2962         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2963
2964         mutex_init(&ifmgd->mtx);
2965
2966         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2967                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2968         else
2969                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2970 }
2971
2972 /* scan finished notification */
2973 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2974 {
2975         struct ieee80211_sub_if_data *sdata;
2976
2977         /* Restart STA timers */
2978         rcu_read_lock();
2979         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2980                 ieee80211_restart_sta_timer(sdata);
2981         rcu_read_unlock();
2982 }
2983
2984 int ieee80211_max_network_latency(struct notifier_block *nb,
2985                                   unsigned long data, void *dummy)
2986 {
2987         s32 latency_usec = (s32) data;
2988         struct ieee80211_local *local =
2989                 container_of(nb, struct ieee80211_local,
2990                              network_latency_notifier);
2991
2992         mutex_lock(&local->iflist_mtx);
2993         ieee80211_recalc_ps(local, latency_usec);
2994         mutex_unlock(&local->iflist_mtx);
2995
2996         return 0;
2997 }
2998
2999 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3000                                      struct cfg80211_bss *cbss, bool assoc)
3001 {
3002         struct ieee80211_local *local = sdata->local;
3003         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3004         struct ieee80211_bss *bss = (void *)cbss->priv;
3005         struct sta_info *sta = NULL;
3006         bool have_sta = false;
3007         int err;
3008         int ht_cfreq;
3009         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3010         const u8 *ht_oper_ie;
3011         const struct ieee80211_ht_operation *ht_oper = NULL;
3012         struct ieee80211_supported_band *sband;
3013
3014         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3015                 return -EINVAL;
3016
3017         if (assoc) {
3018                 rcu_read_lock();
3019                 have_sta = sta_info_get(sdata, cbss->bssid);
3020                 rcu_read_unlock();
3021         }
3022
3023         if (!have_sta) {
3024                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3025                 if (!sta)
3026                         return -ENOMEM;
3027         }
3028
3029         mutex_lock(&local->mtx);
3030         ieee80211_recalc_idle(sdata->local);
3031         mutex_unlock(&local->mtx);
3032
3033         /* switch to the right channel */
3034         sband = local->hw.wiphy->bands[cbss->channel->band];
3035
3036         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3037
3038         if (sband->ht_cap.ht_supported) {
3039                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3040                                               cbss->information_elements,
3041                                               cbss->len_information_elements);
3042                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3043                         ht_oper = (void *)(ht_oper_ie + 2);
3044         }
3045
3046         if (ht_oper) {
3047                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3048                                                           cbss->channel->band);
3049                 /* check that channel matches the right operating channel */
3050                 if (cbss->channel->center_freq != ht_cfreq) {
3051                         /*
3052                          * It's possible that some APs are confused here;
3053                          * Netgear WNDR3700 sometimes reports 4 higher than
3054                          * the actual channel in association responses, but
3055                          * since we look at probe response/beacon data here
3056                          * it should be OK.
3057                          */
3058                         sdata_info(sdata,
3059                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3060                                    cbss->channel->center_freq,
3061                                    ht_cfreq, ht_oper->primary_chan,
3062                                    cbss->channel->band);
3063                         ht_oper = NULL;
3064                 }
3065         }
3066
3067         if (ht_oper) {
3068                 channel_type = NL80211_CHAN_HT20;
3069
3070                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3071                         switch (ht_oper->ht_param &
3072                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3073                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3074                                 channel_type = NL80211_CHAN_HT40PLUS;
3075                                 break;
3076                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3077                                 channel_type = NL80211_CHAN_HT40MINUS;
3078                                 break;
3079                         }
3080                 }
3081         }
3082
3083         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3084                 /* can only fail due to HT40+/- mismatch */
3085                 channel_type = NL80211_CHAN_HT20;
3086                 sdata_info(sdata,
3087                            "disabling 40 MHz due to multi-vif mismatch\n");
3088                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3089                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3090                                                     channel_type));
3091         }
3092
3093         local->oper_channel = cbss->channel;
3094         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3095
3096         if (sta) {
3097                 u32 rates = 0, basic_rates = 0;
3098                 bool have_higher_than_11mbit;
3099                 int min_rate = INT_MAX, min_rate_index = -1;
3100
3101                 ieee80211_get_rates(sband, bss->supp_rates,
3102                                     bss->supp_rates_len,
3103                                     &rates, &basic_rates,
3104                                     &have_higher_than_11mbit,
3105                                     &min_rate, &min_rate_index);
3106
3107                 /*
3108                  * This used to be a workaround for basic rates missing
3109                  * in the association response frame. Now that we no
3110                  * longer use the basic rates from there, it probably
3111                  * doesn't happen any more, but keep the workaround so
3112                  * in case some *other* APs are buggy in different ways
3113                  * we can connect -- with a warning.
3114                  */
3115                 if (!basic_rates && min_rate_index >= 0) {
3116                         sdata_info(sdata,
3117                                    "No basic rates, using min rate instead\n");
3118                         basic_rates = BIT(min_rate_index);
3119                 }
3120
3121                 sta->sta.supp_rates[cbss->channel->band] = rates;
3122                 sdata->vif.bss_conf.basic_rates = basic_rates;
3123
3124                 /* cf. IEEE 802.11 9.2.12 */
3125                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3126                     have_higher_than_11mbit)
3127                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3128                 else
3129                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3130
3131                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3132
3133                 /* set timing information */
3134                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3135                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3136                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3137
3138                 /* tell driver about BSSID, basic rates and timing */
3139                 ieee80211_bss_info_change_notify(sdata,
3140                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3141                         BSS_CHANGED_BEACON_INT);
3142
3143                 if (assoc)
3144                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3145
3146                 err = sta_info_insert(sta);
3147                 sta = NULL;
3148                 if (err) {
3149                         sdata_info(sdata,
3150                                    "failed to insert STA entry for the AP (error %d)\n",
3151                                    err);
3152                         return err;
3153                 }
3154         } else
3155                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3156
3157         return 0;
3158 }
3159
3160 /* config hooks */
3161 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3162                        struct cfg80211_auth_request *req)
3163 {
3164         struct ieee80211_local *local = sdata->local;
3165         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3166         struct ieee80211_mgd_auth_data *auth_data;
3167         u16 auth_alg;
3168         int err;
3169
3170         /* prepare auth data structure */
3171
3172         switch (req->auth_type) {
3173         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3174                 auth_alg = WLAN_AUTH_OPEN;
3175                 break;
3176         case NL80211_AUTHTYPE_SHARED_KEY:
3177                 if (IS_ERR(local->wep_tx_tfm))
3178                         return -EOPNOTSUPP;
3179                 auth_alg = WLAN_AUTH_SHARED_KEY;
3180                 break;
3181         case NL80211_AUTHTYPE_FT:
3182                 auth_alg = WLAN_AUTH_FT;
3183                 break;
3184         case NL80211_AUTHTYPE_NETWORK_EAP:
3185                 auth_alg = WLAN_AUTH_LEAP;
3186                 break;
3187         default:
3188                 return -EOPNOTSUPP;
3189         }
3190
3191         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3192         if (!auth_data)
3193                 return -ENOMEM;
3194
3195         auth_data->bss = req->bss;
3196
3197         if (req->ie && req->ie_len) {
3198                 memcpy(auth_data->ie, req->ie, req->ie_len);
3199                 auth_data->ie_len = req->ie_len;
3200         }
3201
3202         if (req->key && req->key_len) {
3203                 auth_data->key_len = req->key_len;
3204                 auth_data->key_idx = req->key_idx;
3205                 memcpy(auth_data->key, req->key, req->key_len);
3206         }
3207
3208         auth_data->algorithm = auth_alg;
3209
3210         /* try to authenticate/probe */
3211
3212         mutex_lock(&ifmgd->mtx);
3213
3214         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3215             ifmgd->assoc_data) {
3216                 err = -EBUSY;
3217                 goto err_free;
3218         }
3219
3220         if (ifmgd->auth_data)
3221                 ieee80211_destroy_auth_data(sdata, false);
3222
3223         /* prep auth_data so we don't go into idle on disassoc */
3224         ifmgd->auth_data = auth_data;
3225
3226         if (ifmgd->associated)
3227                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3228
3229         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3230
3231         err = ieee80211_prep_connection(sdata, req->bss, false);
3232         if (err)
3233                 goto err_clear;
3234
3235         err = ieee80211_probe_auth(sdata);
3236         if (err) {
3237                 sta_info_destroy_addr(sdata, req->bss->bssid);
3238                 goto err_clear;
3239         }
3240
3241         /* hold our own reference */
3242         cfg80211_ref_bss(auth_data->bss);
3243         err = 0;
3244         goto out_unlock;
3245
3246  err_clear:
3247         ifmgd->auth_data = NULL;
3248  err_free:
3249         kfree(auth_data);
3250  out_unlock:
3251         mutex_unlock(&ifmgd->mtx);
3252
3253         return err;
3254 }
3255
3256 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3257                         struct cfg80211_assoc_request *req)
3258 {
3259         struct ieee80211_local *local = sdata->local;
3260         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3261         struct ieee80211_bss *bss = (void *)req->bss->priv;
3262         struct ieee80211_mgd_assoc_data *assoc_data;
3263         struct ieee80211_supported_band *sband;
3264         const u8 *ssidie, *ht_ie;
3265         int i, err;
3266
3267         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3268         if (!ssidie)
3269                 return -EINVAL;
3270
3271         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3272         if (!assoc_data)
3273                 return -ENOMEM;
3274
3275         mutex_lock(&ifmgd->mtx);
3276
3277         if (ifmgd->associated)
3278                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3279
3280         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3281                 err = -EBUSY;
3282                 goto err_free;
3283         }
3284
3285         if (ifmgd->assoc_data) {
3286                 err = -EBUSY;
3287                 goto err_free;
3288         }
3289
3290         if (ifmgd->auth_data) {
3291                 bool match;
3292
3293                 /* keep sta info, bssid if matching */
3294                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3295                 ieee80211_destroy_auth_data(sdata, match);
3296         }
3297
3298         /* prepare assoc data */
3299
3300         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3301         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3302
3303         ifmgd->beacon_crc_valid = false;
3304
3305         /*
3306          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3307          * We still associate in non-HT mode (11a/b/g) if any one of these
3308          * ciphers is configured as pairwise.
3309          * We can set this to true for non-11n hardware, that'll be checked
3310          * separately along with the peer capabilities.
3311          */
3312         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3313                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3314                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3315                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3316                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3317                         netdev_info(sdata->dev,
3318                                     "disabling HT due to WEP/TKIP use\n");
3319                 }
3320         }
3321
3322         if (req->flags & ASSOC_REQ_DISABLE_HT)
3323                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3324
3325         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3326         sband = local->hw.wiphy->bands[req->bss->channel->band];
3327         if (!sband->ht_cap.ht_supported ||
3328             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3329                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3330                 netdev_info(sdata->dev,
3331                             "disabling HT as WMM/QoS is not supported\n");
3332         }
3333
3334         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3335         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3336                sizeof(ifmgd->ht_capa_mask));
3337
3338         if (req->ie && req->ie_len) {
3339                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3340                 assoc_data->ie_len = req->ie_len;
3341         }
3342
3343         assoc_data->bss = req->bss;
3344
3345         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3346                 if (ifmgd->powersave)
3347                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3348                 else
3349                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3350         } else
3351                 ifmgd->ap_smps = ifmgd->req_smps;
3352
3353         assoc_data->capability = req->bss->capability;
3354         assoc_data->wmm = bss->wmm_used &&
3355                           (local->hw.queues >= IEEE80211_NUM_ACS);
3356         assoc_data->supp_rates = bss->supp_rates;
3357         assoc_data->supp_rates_len = bss->supp_rates_len;
3358
3359         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3360         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3361                 assoc_data->ap_ht_param =
3362                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3363         else
3364                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3365
3366         if (bss->wmm_used && bss->uapsd_supported &&
3367             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3368                 assoc_data->uapsd = true;
3369                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3370         } else {
3371                 assoc_data->uapsd = false;
3372                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3373         }
3374
3375         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3376         assoc_data->ssid_len = ssidie[1];
3377
3378         if (req->prev_bssid)
3379                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3380
3381         if (req->use_mfp) {
3382                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3383                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3384         } else {
3385                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3386                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3387         }
3388
3389         if (req->crypto.control_port)
3390                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3391         else
3392                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3393
3394         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3395         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3396
3397         /* kick off associate process */
3398
3399         ifmgd->assoc_data = assoc_data;
3400
3401         err = ieee80211_prep_connection(sdata, req->bss, true);
3402         if (err)
3403                 goto err_clear;
3404
3405         if (!bss->dtim_period &&
3406             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3407                 /*
3408                  * Wait up to one beacon interval ...
3409                  * should this be more if we miss one?
3410                  */
3411                 sdata_info(sdata, "waiting for beacon from %pM\n",
3412                            ifmgd->bssid);
3413                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3414         } else {
3415                 assoc_data->have_beacon = true;
3416                 assoc_data->sent_assoc = false;
3417                 assoc_data->timeout = jiffies;
3418         }
3419         run_again(ifmgd, assoc_data->timeout);
3420
3421         if (bss->corrupt_data) {
3422                 char *corrupt_type = "data";
3423                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3424                         if (bss->corrupt_data &
3425                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3426                                 corrupt_type = "beacon and probe response";
3427                         else
3428                                 corrupt_type = "beacon";
3429                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3430                         corrupt_type = "probe response";
3431                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3432                            corrupt_type);
3433         }
3434
3435         err = 0;
3436         goto out;
3437  err_clear:
3438         ifmgd->assoc_data = NULL;
3439  err_free:
3440         kfree(assoc_data);
3441  out:
3442         mutex_unlock(&ifmgd->mtx);
3443
3444         return err;
3445 }
3446
3447 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3448                          struct cfg80211_deauth_request *req)
3449 {
3450         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3451         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3452
3453         mutex_lock(&ifmgd->mtx);
3454
3455         if (ifmgd->auth_data) {
3456                 ieee80211_destroy_auth_data(sdata, false);
3457                 mutex_unlock(&ifmgd->mtx);
3458                 return 0;
3459         }
3460
3461         sdata_info(sdata,
3462                    "deauthenticating from %pM by local choice (reason=%d)\n",
3463                    req->bssid, req->reason_code);
3464
3465         if (ifmgd->associated &&
3466             ether_addr_equal(ifmgd->associated->bssid, req->bssid))
3467                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3468                                        req->reason_code, true, frame_buf);
3469         else
3470                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3471                                                IEEE80211_STYPE_DEAUTH,
3472                                                req->reason_code, true,
3473                                                frame_buf);
3474         mutex_unlock(&ifmgd->mtx);
3475
3476         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3477
3478         mutex_lock(&sdata->local->mtx);
3479         ieee80211_recalc_idle(sdata->local);
3480         mutex_unlock(&sdata->local->mtx);
3481
3482         return 0;
3483 }
3484
3485 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3486                            struct cfg80211_disassoc_request *req)
3487 {
3488         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3489         u8 bssid[ETH_ALEN];
3490         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3491
3492         mutex_lock(&ifmgd->mtx);
3493
3494         /*
3495          * cfg80211 should catch this ... but it's racy since
3496          * we can receive a disassoc frame, process it, hand it
3497          * to cfg80211 while that's in a locked section already
3498          * trying to tell us that the user wants to disconnect.
3499          */
3500         if (ifmgd->associated != req->bss) {
3501                 mutex_unlock(&ifmgd->mtx);
3502                 return -ENOLINK;
3503         }
3504
3505         sdata_info(sdata,
3506                    "disassociating from %pM by local choice (reason=%d)\n",
3507                    req->bss->bssid, req->reason_code);
3508
3509         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3510         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3511                                req->reason_code, !req->local_state_change,
3512                                frame_buf);
3513         mutex_unlock(&ifmgd->mtx);
3514
3515         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3516
3517         mutex_lock(&sdata->local->mtx);
3518         ieee80211_recalc_idle(sdata->local);
3519         mutex_unlock(&sdata->local->mtx);
3520
3521         return 0;
3522 }
3523
3524 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3525 {
3526         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3527
3528         mutex_lock(&ifmgd->mtx);
3529         if (ifmgd->assoc_data)
3530                 ieee80211_destroy_assoc_data(sdata, false);
3531         if (ifmgd->auth_data)
3532                 ieee80211_destroy_auth_data(sdata, false);
3533         del_timer_sync(&ifmgd->timer);
3534         mutex_unlock(&ifmgd->mtx);
3535 }
3536
3537 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3538                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3539                                gfp_t gfp)
3540 {
3541         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3542
3543         trace_api_cqm_rssi_notify(sdata, rssi_event);
3544
3545         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3546 }
3547 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);