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, const u8 *ht_oper_ie,
 262                                 struct ieee80211_supported_band *sband,
 263                                 struct ieee80211_channel *channel,
 264                                 enum ieee80211_smps_mode smps)
 265 {
 266         struct ieee80211_ht_operation *ht_oper;
 267         u8 *pos;
 268         u32 flags = channel->flags;
 269         u16 cap;
 270         struct ieee80211_sta_ht_cap ht_cap;
 271
 272         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 273
 274         if (!ht_oper_ie)
 275                 return;
 276
 277         if (ht_oper_ie[1] < sizeof(struct ieee80211_ht_operation))
 278                 return;
 279
 280         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 281         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 282
 283         ht_oper = (struct ieee80211_ht_operation *)(ht_oper_ie + 2);
 284
 285         /* determine capability flags */
 286         cap = ht_cap.cap;
 287
 288         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 289         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 290                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 291                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 292                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 293                 }
 294                 break;
 295         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 296                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 297                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 298                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 299                 }
 300                 break;
 301         }
 302
 303         /*
 304          * If 40 MHz was disabled associate as though we weren't
 305          * capable of 40 MHz -- some broken APs will never fall
 306          * back to trying to transmit in 20 MHz.
 307          */
 308         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 309                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 310                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 311         }
 312
 313         /* set SM PS mode properly */
 314         cap &= ~IEEE80211_HT_CAP_SM_PS;
 315         switch (smps) {
 316         case IEEE80211_SMPS_AUTOMATIC:
 317         case IEEE80211_SMPS_NUM_MODES:
 318                 WARN_ON(1);
 319         case IEEE80211_SMPS_OFF:
 320                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 321                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 322                 break;
 323         case IEEE80211_SMPS_STATIC:
 324                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 325                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 326                 break;
 327         case IEEE80211_SMPS_DYNAMIC:
 328                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 329                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 330                 break;
 331         }
 332
 333         /* reserve and fill IE */
 334         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 335         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 336 }
 337
 338 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 339 {
 340         struct ieee80211_local *local = sdata->local;
 341         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 342         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 343         struct sk_buff *skb;
 344         struct ieee80211_mgmt *mgmt;
 345         u8 *pos, qos_info;
 346         size_t offset = 0, noffset;
 347         int i, count, rates_len, supp_rates_len;
 348         u16 capab;
 349         struct ieee80211_supported_band *sband;
 350         u32 rates = 0;
 351
 352         lockdep_assert_held(&ifmgd->mtx);
 353
 354         sband = local->hw.wiphy->bands[local->oper_channel->band];
 355
 356         if (assoc_data->supp_rates_len) {
 357                 /*
 358                  * Get all rates supported by the device and the AP as
 359                  * some APs don't like getting a superset of their rates
 360                  * in the association request (e.g. D-Link DAP 1353 in
 361                  * b-only mode)...
 362                  */
 363                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 364                                                        assoc_data->supp_rates_len,
 365                                                        sband, &rates);
 366         } else {
 367                 /*
 368                  * In case AP not provide any supported rates information
 369                  * before association, we send information element(s) with
 370                  * all rates that we support.
 371                  */
 372                 rates = ~0;
 373                 rates_len = sband->n_bitrates;
 374         }
 375
 376         skb = alloc_skb(local->hw.extra_tx_headroom +
 377                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 378                         2 + assoc_data->ssid_len + /* SSID */
 379                         4 + rates_len + /* (extended) rates */
 380                         4 + /* power capability */
 381                         2 + 2 * sband->n_channels + /* supported channels */
 382                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 383                         assoc_data->ie_len + /* extra IEs */
 384                         9, /* WMM */
 385                         GFP_KERNEL);
 386         if (!skb)
 387                 return;
 388
 389         skb_reserve(skb, local->hw.extra_tx_headroom);
 390
 391         capab = WLAN_CAPABILITY_ESS;
 392
 393         if (sband->band == IEEE80211_BAND_2GHZ) {
 394                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 395                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 396                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 397                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 398         }
 399
 400         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 401                 capab |= WLAN_CAPABILITY_PRIVACY;
 402
 403         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 404             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 405                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 406
 407         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 408         memset(mgmt, 0, 24);
 409         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 410         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 411         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 412
 413         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 414                 skb_put(skb, 10);
 415                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 416                                                   IEEE80211_STYPE_REASSOC_REQ);
 417                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 418                 mgmt->u.reassoc_req.listen_interval =
 419                                 cpu_to_le16(local->hw.conf.listen_interval);
 420                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 421                        ETH_ALEN);
 422         } else {
 423                 skb_put(skb, 4);
 424                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 425                                                   IEEE80211_STYPE_ASSOC_REQ);
 426                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 427                 mgmt->u.assoc_req.listen_interval =
 428                                 cpu_to_le16(local->hw.conf.listen_interval);
 429         }
 430
 431         /* SSID */
 432         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 433         *pos++ = WLAN_EID_SSID;
 434         *pos++ = assoc_data->ssid_len;
 435         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 436
 437         /* add all rates which were marked to be used above */
 438         supp_rates_len = rates_len;
 439         if (supp_rates_len > 8)
 440                 supp_rates_len = 8;
 441
 442         pos = skb_put(skb, supp_rates_len + 2);
 443         *pos++ = WLAN_EID_SUPP_RATES;
 444         *pos++ = supp_rates_len;
 445
 446         count = 0;
 447         for (i = 0; i < sband->n_bitrates; i++) {
 448                 if (BIT(i) & rates) {
 449                         int rate = sband->bitrates[i].bitrate;
 450                         *pos++ = (u8) (rate / 5);
 451                         if (++count == 8)
 452                                 break;
 453                 }
 454         }
 455
 456         if (rates_len > count) {
 457                 pos = skb_put(skb, rates_len - count + 2);
 458                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 459                 *pos++ = rates_len - count;
 460
 461                 for (i++; i < sband->n_bitrates; i++) {
 462                         if (BIT(i) & rates) {
 463                                 int rate = sband->bitrates[i].bitrate;
 464                                 *pos++ = (u8) (rate / 5);
 465                         }
 466                 }
 467         }
 468
 469         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 470                 /* 1. power capabilities */
 471                 pos = skb_put(skb, 4);
 472                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 473                 *pos++ = 2;
 474                 *pos++ = 0; /* min tx power */
 475                 *pos++ = local->oper_channel->max_power; /* max tx power */
 476
 477                 /* 2. supported channels */
 478                 /* TODO: get this in reg domain format */
 479                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 480                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 481                 *pos++ = 2 * sband->n_channels;
 482                 for (i = 0; i < sband->n_channels; i++) {
 483                         *pos++ = ieee80211_frequency_to_channel(
 484                                         sband->channels[i].center_freq);
 485                         *pos++ = 1; /* one channel in the subband*/
 486                 }
 487         }
 488
 489         /* if present, add any custom IEs that go before HT */
 490         if (assoc_data->ie_len && assoc_data->ie) {
 491                 static const u8 before_ht[] = {
 492                         WLAN_EID_SSID,
 493                         WLAN_EID_SUPP_RATES,
 494                         WLAN_EID_EXT_SUPP_RATES,
 495                         WLAN_EID_PWR_CAPABILITY,
 496                         WLAN_EID_SUPPORTED_CHANNELS,
 497                         WLAN_EID_RSN,
 498                         WLAN_EID_QOS_CAPA,
 499                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 500                         WLAN_EID_MOBILITY_DOMAIN,
 501                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 502                 };
 503                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 504                                              before_ht, ARRAY_SIZE(before_ht),
 505                                              offset);
 506                 pos = skb_put(skb, noffset - offset);
 507                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 508                 offset = noffset;
 509         }
 510
 511         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 512                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ht_operation_ie,
 513                                     sband, local->oper_channel, ifmgd->ap_smps);
 514
 515         /* if present, add any custom non-vendor IEs that go after HT */
 516         if (assoc_data->ie_len && assoc_data->ie) {
 517                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 518                                                     assoc_data->ie_len,
 519                                                     offset);
 520                 pos = skb_put(skb, noffset - offset);
 521                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 522                 offset = noffset;
 523         }
 524
 525         if (assoc_data->wmm) {
 526                 if (assoc_data->uapsd) {
 527                         qos_info = ifmgd->uapsd_queues;
 528                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 529                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 530                 } else {
 531                         qos_info = 0;
 532                 }
 533
 534                 pos = skb_put(skb, 9);
 535                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 536                 *pos++ = 7; /* len */
 537                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 538                 *pos++ = 0x50;
 539                 *pos++ = 0xf2;
 540                 *pos++ = 2; /* WME */
 541                 *pos++ = 0; /* WME info */
 542                 *pos++ = 1; /* WME ver */
 543                 *pos++ = qos_info;
 544         }
 545
 546         /* add any remaining custom (i.e. vendor specific here) IEs */
 547         if (assoc_data->ie_len && assoc_data->ie) {
 548                 noffset = assoc_data->ie_len;
 549                 pos = skb_put(skb, noffset - offset);
 550                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 551         }
 552
 553         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 554         ieee80211_tx_skb(sdata, skb);
 555 }
 556
 557 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 558                                            const u8 *bssid, u16 stype,
 559                                            u16 reason, bool send_frame,
 560                                            u8 *frame_buf)
 561 {
 562         struct ieee80211_local *local = sdata->local;
 563         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 564         struct sk_buff *skb;
 565         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 566
 567         /* build frame */
 568         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 569         mgmt->duration = 0; /* initialize only */
 570         mgmt->seq_ctrl = 0; /* initialize only */
 571         memcpy(mgmt->da, bssid, ETH_ALEN);
 572         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 573         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 574         /* u.deauth.reason_code == u.disassoc.reason_code */
 575         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 576
 577         if (send_frame) {
 578                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 579                                     DEAUTH_DISASSOC_LEN);
 580                 if (!skb)
 581                         return;
 582
 583                 skb_reserve(skb, local->hw.extra_tx_headroom);
 584
 585                 /* copy in frame */
 586                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 587                        mgmt, DEAUTH_DISASSOC_LEN);
 588
 589                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 590                         IEEE80211_SKB_CB(skb)->flags |=
 591                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 592                 ieee80211_tx_skb(sdata, skb);
 593         }
 594 }
 595
 596 void ieee80211_send_pspoll(struct ieee80211_local *local,
 597                            struct ieee80211_sub_if_data *sdata)
 598 {
 599         struct ieee80211_pspoll *pspoll;
 600         struct sk_buff *skb;
 601
 602         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 603         if (!skb)
 604                 return;
 605
 606         pspoll = (struct ieee80211_pspoll *) skb->data;
 607         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 608
 609         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 610         ieee80211_tx_skb(sdata, skb);
 611 }
 612
 613 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 614                              struct ieee80211_sub_if_data *sdata,
 615                              int powersave)
 616 {
 617         struct sk_buff *skb;
 618         struct ieee80211_hdr_3addr *nullfunc;
 619         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 620
 621         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 622         if (!skb)
 623                 return;
 624
 625         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 626         if (powersave)
 627                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 628
 629         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 630         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 631                             IEEE80211_STA_CONNECTION_POLL))
 632                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 633
 634         ieee80211_tx_skb(sdata, skb);
 635 }
 636
 637 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 638                                           struct ieee80211_sub_if_data *sdata)
 639 {
 640         struct sk_buff *skb;
 641         struct ieee80211_hdr *nullfunc;
 642         __le16 fc;
 643
 644         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 645                 return;
 646
 647         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 648         if (!skb)
 649                 return;
 650
 651         skb_reserve(skb, local->hw.extra_tx_headroom);
 652
 653         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 654         memset(nullfunc, 0, 30);
 655         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 656                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 657         nullfunc->frame_control = fc;
 658         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 659         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 660         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 661         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 662
 663         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 664         ieee80211_tx_skb(sdata, skb);
 665 }
 666
 667 /* spectrum management related things */
 668 static void ieee80211_chswitch_work(struct work_struct *work)
 669 {
 670         struct ieee80211_sub_if_data *sdata =
 671                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 672         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 673
 674         if (!ieee80211_sdata_running(sdata))
 675                 return;
 676
 677         mutex_lock(&ifmgd->mtx);
 678         if (!ifmgd->associated)
 679                 goto out;
 680
 681         sdata->local->oper_channel = sdata->local->csa_channel;
 682         if (!sdata->local->ops->channel_switch) {
 683                 /* call "hw_config" only if doing sw channel switch */
 684                 ieee80211_hw_config(sdata->local,
 685                         IEEE80211_CONF_CHANGE_CHANNEL);
 686         } else {
 687                 /* update the device channel directly */
 688                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 689         }
 690
 691         /* XXX: shouldn't really modify cfg80211-owned data! */
 692         ifmgd->associated->channel = sdata->local->oper_channel;
 693
 694         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 695                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 696  out:
 697         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 698         mutex_unlock(&ifmgd->mtx);
 699 }
 700
 701 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 702 {
 703         struct ieee80211_sub_if_data *sdata;
 704         struct ieee80211_if_managed *ifmgd;
 705
 706         sdata = vif_to_sdata(vif);
 707         ifmgd = &sdata->u.mgd;
 708
 709         trace_api_chswitch_done(sdata, success);
 710         if (!success) {
 711                 /*
 712                  * If the channel switch was not successful, stay
 713                  * around on the old channel. We currently lack
 714                  * good handling of this situation, possibly we
 715                  * should just drop the association.
 716                  */
 717                 sdata->local->csa_channel = sdata->local->oper_channel;
 718         }
 719
 720         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 721 }
 722 EXPORT_SYMBOL(ieee80211_chswitch_done);
 723
 724 static void ieee80211_chswitch_timer(unsigned long data)
 725 {
 726         struct ieee80211_sub_if_data *sdata =
 727                 (struct ieee80211_sub_if_data *) data;
 728         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 729
 730         if (sdata->local->quiescing) {
 731                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 732                 return;
 733         }
 734
 735         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 736 }
 737
 738 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 739                                       struct ieee80211_channel_sw_ie *sw_elem,
 740                                       struct ieee80211_bss *bss,
 741                                       u64 timestamp)
 742 {
 743         struct cfg80211_bss *cbss =
 744                 container_of((void *)bss, struct cfg80211_bss, priv);
 745         struct ieee80211_channel *new_ch;
 746         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 747         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 748                                                       cbss->channel->band);
 749
 750         ASSERT_MGD_MTX(ifmgd);
 751
 752         if (!ifmgd->associated)
 753                 return;
 754
 755         if (sdata->local->scanning)
 756                 return;
 757
 758         /* Disregard subsequent beacons if we are already running a timer
 759            processing a CSA */
 760
 761         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 762                 return;
 763
 764         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 765         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 766                 return;
 767
 768         sdata->local->csa_channel = new_ch;
 769
 770         if (sdata->local->ops->channel_switch) {
 771                 /* use driver's channel switch callback */
 772                 struct ieee80211_channel_switch ch_switch;
 773                 memset(&ch_switch, 0, sizeof(ch_switch));
 774                 ch_switch.timestamp = timestamp;
 775                 if (sw_elem->mode) {
 776                         ch_switch.block_tx = true;
 777                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 778                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 779                 }
 780                 ch_switch.channel = new_ch;
 781                 ch_switch.count = sw_elem->count;
 782                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 783                 drv_channel_switch(sdata->local, &ch_switch);
 784                 return;
 785         }
 786
 787         /* channel switch handled in software */
 788         if (sw_elem->count <= 1) {
 789                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 790         } else {
 791                 if (sw_elem->mode)
 792                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 793                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 794                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 795                 mod_timer(&ifmgd->chswitch_timer,
 796                           jiffies +
 797                           msecs_to_jiffies(sw_elem->count *
 798                                            cbss->beacon_interval));
 799         }
 800 }
 801
 802 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 803                                         u16 capab_info, u8 *pwr_constr_elem,
 804                                         u8 pwr_constr_elem_len)
 805 {
 806         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 807
 808         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 809                 return;
 810
 811         /* Power constraint IE length should be 1 octet */
 812         if (pwr_constr_elem_len != 1)
 813                 return;
 814
 815         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 816             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 817                 sdata->local->power_constr_level = *pwr_constr_elem;
 818                 ieee80211_hw_config(sdata->local, 0);
 819         }
 820 }
 821
 822 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 823 {
 824         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 825         struct ieee80211_local *local = sdata->local;
 826         struct ieee80211_conf *conf = &local->hw.conf;
 827
 828         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 829                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 830                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 831
 832         local->disable_dynamic_ps = false;
 833         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 834 }
 835 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 836
 837 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 838 {
 839         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 840         struct ieee80211_local *local = sdata->local;
 841         struct ieee80211_conf *conf = &local->hw.conf;
 842
 843         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 844                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 845                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 846
 847         local->disable_dynamic_ps = true;
 848         conf->dynamic_ps_timeout = 0;
 849         del_timer_sync(&local->dynamic_ps_timer);
 850         ieee80211_queue_work(&local->hw,
 851                              &local->dynamic_ps_enable_work);
 852 }
 853 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 854
 855 /* powersave */
 856 static void ieee80211_enable_ps(struct ieee80211_local *local,
 857                                 struct ieee80211_sub_if_data *sdata)
 858 {
 859         struct ieee80211_conf *conf = &local->hw.conf;
 860
 861         /*
 862          * If we are scanning right now then the parameters will
 863          * take effect when scan finishes.
 864          */
 865         if (local->scanning)
 866                 return;
 867
 868         if (conf->dynamic_ps_timeout > 0 &&
 869             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 870                 mod_timer(&local->dynamic_ps_timer, jiffies +
 871                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 872         } else {
 873                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 874                         ieee80211_send_nullfunc(local, sdata, 1);
 875
 876                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 877                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 878                         return;
 879
 880                 conf->flags |= IEEE80211_CONF_PS;
 881                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 882         }
 883 }
 884
 885 static void ieee80211_change_ps(struct ieee80211_local *local)
 886 {
 887         struct ieee80211_conf *conf = &local->hw.conf;
 888
 889         if (local->ps_sdata) {
 890                 ieee80211_enable_ps(local, local->ps_sdata);
 891         } else if (conf->flags & IEEE80211_CONF_PS) {
 892                 conf->flags &= ~IEEE80211_CONF_PS;
 893                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 894                 del_timer_sync(&local->dynamic_ps_timer);
 895                 cancel_work_sync(&local->dynamic_ps_enable_work);
 896         }
 897 }
 898
 899 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 900 {
 901         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 902         struct sta_info *sta = NULL;
 903         bool authorized = false;
 904
 905         if (!mgd->powersave)
 906                 return false;
 907
 908         if (mgd->broken_ap)
 909                 return false;
 910
 911         if (!mgd->associated)
 912                 return false;
 913
 914         if (!mgd->associated->beacon_ies)
 915                 return false;
 916
 917         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 918                           IEEE80211_STA_CONNECTION_POLL))
 919                 return false;
 920
 921         rcu_read_lock();
 922         sta = sta_info_get(sdata, mgd->bssid);
 923         if (sta)
 924                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 925         rcu_read_unlock();
 926
 927         return authorized;
 928 }
 929
 930 /* need to hold RTNL or interface lock */
 931 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 932 {
 933         struct ieee80211_sub_if_data *sdata, *found = NULL;
 934         int count = 0;
 935         int timeout;
 936
 937         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 938                 local->ps_sdata = NULL;
 939                 return;
 940         }
 941
 942         if (!list_empty(&local->work_list)) {
 943                 local->ps_sdata = NULL;
 944                 goto change;
 945         }
 946
 947         list_for_each_entry(sdata, &local->interfaces, list) {
 948                 if (!ieee80211_sdata_running(sdata))
 949                         continue;
 950                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 951                         /* If an AP vif is found, then disable PS
 952                          * by setting the count to zero thereby setting
 953                          * ps_sdata to NULL.
 954                          */
 955                         count = 0;
 956                         break;
 957                 }
 958                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 959                         continue;
 960                 found = sdata;
 961                 count++;
 962         }
 963
 964         if (count == 1 && ieee80211_powersave_allowed(found)) {
 965                 struct ieee80211_conf *conf = &local->hw.conf;
 966                 s32 beaconint_us;
 967
 968                 if (latency < 0)
 969                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 970
 971                 beaconint_us = ieee80211_tu_to_usec(
 972                                         found->vif.bss_conf.beacon_int);
 973
 974                 timeout = local->dynamic_ps_forced_timeout;
 975                 if (timeout < 0) {
 976                         /*
 977                          * Go to full PSM if the user configures a very low
 978                          * latency requirement.
 979                          * The 2000 second value is there for compatibility
 980                          * until the PM_QOS_NETWORK_LATENCY is configured
 981                          * with real values.
 982                          */
 983                         if (latency > (1900 * USEC_PER_MSEC) &&
 984                             latency != (2000 * USEC_PER_SEC))
 985                                 timeout = 0;
 986                         else
 987                                 timeout = 100;
 988                 }
 989                 local->dynamic_ps_user_timeout = timeout;
 990                 if (!local->disable_dynamic_ps)
 991                         conf->dynamic_ps_timeout =
 992                                 local->dynamic_ps_user_timeout;
 993
 994                 if (beaconint_us > latency) {
 995                         local->ps_sdata = NULL;
 996                 } else {
 997                         struct ieee80211_bss *bss;
 998                         int maxslp = 1;
 999                         u8 dtimper;
1000
1001                         bss = (void *)found->u.mgd.associated->priv;
1002                         dtimper = bss->dtim_period;
1003
1004                         /* If the TIM IE is invalid, pretend the value is 1 */
1005                         if (!dtimper)
1006                                 dtimper = 1;
1007                         else if (dtimper > 1)
1008                                 maxslp = min_t(int, dtimper,
1009                                                     latency / beaconint_us);
1010
1011                         local->hw.conf.max_sleep_period = maxslp;
1012                         local->hw.conf.ps_dtim_period = dtimper;
1013                         local->ps_sdata = found;
1014                 }
1015         } else {
1016                 local->ps_sdata = NULL;
1017         }
1018
1019  change:
1020         ieee80211_change_ps(local);
1021 }
1022
1023 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1024 {
1025         struct ieee80211_local *local =
1026                 container_of(work, struct ieee80211_local,
1027                              dynamic_ps_disable_work);
1028
1029         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1030                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1031                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1032         }
1033
1034         ieee80211_wake_queues_by_reason(&local->hw,
1035                                         IEEE80211_QUEUE_STOP_REASON_PS);
1036 }
1037
1038 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1039 {
1040         struct ieee80211_local *local =
1041                 container_of(work, struct ieee80211_local,
1042                              dynamic_ps_enable_work);
1043         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1044         struct ieee80211_if_managed *ifmgd;
1045         unsigned long flags;
1046         int q;
1047
1048         /* can only happen when PS was just disabled anyway */
1049         if (!sdata)
1050                 return;
1051
1052         ifmgd = &sdata->u.mgd;
1053
1054         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1055                 return;
1056
1057         if (!local->disable_dynamic_ps &&
1058             local->hw.conf.dynamic_ps_timeout > 0) {
1059                 /* don't enter PS if TX frames are pending */
1060                 if (drv_tx_frames_pending(local)) {
1061                         mod_timer(&local->dynamic_ps_timer, jiffies +
1062                                   msecs_to_jiffies(
1063                                   local->hw.conf.dynamic_ps_timeout));
1064                         return;
1065                 }
1066
1067                 /*
1068                  * transmission can be stopped by others which leads to
1069                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1070                  * is not the actual idle state.
1071                  */
1072                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1073                 for (q = 0; q < local->hw.queues; q++) {
1074                         if (local->queue_stop_reasons[q]) {
1075                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1076                                                        flags);
1077                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1078                                           msecs_to_jiffies(
1079                                           local->hw.conf.dynamic_ps_timeout));
1080                                 return;
1081                         }
1082                 }
1083                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1084         }
1085
1086         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1087             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1088                 netif_tx_stop_all_queues(sdata->dev);
1089
1090                 if (drv_tx_frames_pending(local))
1091                         mod_timer(&local->dynamic_ps_timer, jiffies +
1092                                   msecs_to_jiffies(
1093                                   local->hw.conf.dynamic_ps_timeout));
1094                 else {
1095                         ieee80211_send_nullfunc(local, sdata, 1);
1096                         /* Flush to get the tx status of nullfunc frame */
1097                         drv_flush(local, false);
1098                 }
1099         }
1100
1101         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1102               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1103             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1104                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1105                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1106                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1107         }
1108
1109         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1110                 netif_tx_wake_all_queues(sdata->dev);
1111 }
1112
1113 void ieee80211_dynamic_ps_timer(unsigned long data)
1114 {
1115         struct ieee80211_local *local = (void *) data;
1116
1117         if (local->quiescing || local->suspended)
1118                 return;
1119
1120         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1121 }
1122
1123 /* MLME */
1124 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
1125                                      struct ieee80211_sub_if_data *sdata,
1126                                      u8 *wmm_param, size_t wmm_param_len)
1127 {
1128         struct ieee80211_tx_queue_params params;
1129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1130         size_t left;
1131         int count;
1132         u8 *pos, uapsd_queues = 0;
1133
1134         if (!local->ops->conf_tx)
1135                 return;
1136
1137         if (local->hw.queues < IEEE80211_NUM_ACS)
1138                 return;
1139
1140         if (!wmm_param)
1141                 return;
1142
1143         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1144                 return;
1145
1146         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1147                 uapsd_queues = ifmgd->uapsd_queues;
1148
1149         count = wmm_param[6] & 0x0f;
1150         if (count == ifmgd->wmm_last_param_set)
1151                 return;
1152         ifmgd->wmm_last_param_set = count;
1153
1154         pos = wmm_param + 8;
1155         left = wmm_param_len - 8;
1156
1157         memset(&params, 0, sizeof(params));
1158
1159         local->wmm_acm = 0;
1160         for (; left >= 4; left -= 4, pos += 4) {
1161                 int aci = (pos[0] >> 5) & 0x03;
1162                 int acm = (pos[0] >> 4) & 0x01;
1163                 bool uapsd = false;
1164                 int queue;
1165
1166                 switch (aci) {
1167                 case 1: /* AC_BK */
1168                         queue = 3;
1169                         if (acm)
1170                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1171                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1172                                 uapsd = true;
1173                         break;
1174                 case 2: /* AC_VI */
1175                         queue = 1;
1176                         if (acm)
1177                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1178                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1179                                 uapsd = true;
1180                         break;
1181                 case 3: /* AC_VO */
1182                         queue = 0;
1183                         if (acm)
1184                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1185                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1186                                 uapsd = true;
1187                         break;
1188                 case 0: /* AC_BE */
1189                 default:
1190                         queue = 2;
1191                         if (acm)
1192                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1193                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1194                                 uapsd = true;
1195                         break;
1196                 }
1197
1198                 params.aifs = pos[0] & 0x0f;
1199                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1200                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1201                 params.txop = get_unaligned_le16(pos + 2);
1202                 params.uapsd = uapsd;
1203
1204 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1205                 wiphy_debug(local->hw.wiphy,
1206                             "WMM queue=%d aci=%d acm=%d aifs=%d "
1207                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1208                             queue, aci, acm,
1209                             params.aifs, params.cw_min, params.cw_max,
1210                             params.txop, params.uapsd);
1211 #endif
1212                 sdata->tx_conf[queue] = params;
1213                 if (drv_conf_tx(local, sdata, queue, &params))
1214                         wiphy_debug(local->hw.wiphy,
1215                                     "failed to set TX queue parameters for queue %d\n",
1216                                     queue);
1217         }
1218
1219         /* enable WMM or activate new settings */
1220         sdata->vif.bss_conf.qos = true;
1221 }
1222
1223 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1224                                            u16 capab, bool erp_valid, u8 erp)
1225 {
1226         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1227         u32 changed = 0;
1228         bool use_protection;
1229         bool use_short_preamble;
1230         bool use_short_slot;
1231
1232         if (erp_valid) {
1233                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1234                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1235         } else {
1236                 use_protection = false;
1237                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1238         }
1239
1240         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1241         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1242                 use_short_slot = true;
1243
1244         if (use_protection != bss_conf->use_cts_prot) {
1245                 bss_conf->use_cts_prot = use_protection;
1246                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1247         }
1248
1249         if (use_short_preamble != bss_conf->use_short_preamble) {
1250                 bss_conf->use_short_preamble = use_short_preamble;
1251                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1252         }
1253
1254         if (use_short_slot != bss_conf->use_short_slot) {
1255                 bss_conf->use_short_slot = use_short_slot;
1256                 changed |= BSS_CHANGED_ERP_SLOT;
1257         }
1258
1259         return changed;
1260 }
1261
1262 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1263                                      struct cfg80211_bss *cbss,
1264                                      u32 bss_info_changed)
1265 {
1266         struct ieee80211_bss *bss = (void *)cbss->priv;
1267         struct ieee80211_local *local = sdata->local;
1268         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1269
1270         bss_info_changed |= BSS_CHANGED_ASSOC;
1271         /* set timing information */
1272         bss_conf->beacon_int = cbss->beacon_interval;
1273         bss_conf->last_tsf = cbss->tsf;
1274
1275         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1276         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1277                 cbss->capability, bss->has_erp_value, bss->erp_value);
1278
1279         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1280                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1281
1282         sdata->u.mgd.associated = cbss;
1283         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1284
1285         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1286
1287         /* just to be sure */
1288         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1289                                 IEEE80211_STA_BEACON_POLL);
1290
1291         ieee80211_led_assoc(local, 1);
1292
1293         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1294                 bss_conf->dtim_period = bss->dtim_period;
1295         else
1296                 bss_conf->dtim_period = 0;
1297
1298         bss_conf->assoc = 1;
1299
1300         /* Tell the driver to monitor connection quality (if supported) */
1301         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1302             bss_conf->cqm_rssi_thold)
1303                 bss_info_changed |= BSS_CHANGED_CQM;
1304
1305         /* Enable ARP filtering */
1306         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1307                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1308                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1309         }
1310
1311         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1312
1313         mutex_lock(&local->iflist_mtx);
1314         ieee80211_recalc_ps(local, -1);
1315         ieee80211_recalc_smps(local);
1316         mutex_unlock(&local->iflist_mtx);
1317
1318         netif_tx_start_all_queues(sdata->dev);
1319         netif_carrier_on(sdata->dev);
1320 }
1321
1322 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1323                                    u16 stype, u16 reason, bool tx,
1324                                    u8 *frame_buf)
1325 {
1326         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1327         struct ieee80211_local *local = sdata->local;
1328         struct sta_info *sta;
1329         u32 changed = 0;
1330         u8 bssid[ETH_ALEN];
1331
1332         ASSERT_MGD_MTX(ifmgd);
1333
1334         if (WARN_ON_ONCE(tx && !frame_buf))
1335                 return;
1336
1337         if (WARN_ON(!ifmgd->associated))
1338                 return;
1339
1340         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1341
1342         ifmgd->associated = NULL;
1343         memset(ifmgd->bssid, 0, ETH_ALEN);
1344
1345         /*
1346          * we need to commit the associated = NULL change because the
1347          * scan code uses that to determine whether this iface should
1348          * go to/wake up from powersave or not -- and could otherwise
1349          * wake the queues erroneously.
1350          */
1351         smp_mb();
1352
1353         /*
1354          * Thus, we can only afterwards stop the queues -- to account
1355          * for the case where another CPU is finishing a scan at this
1356          * time -- we don't want the scan code to enable queues.
1357          */
1358
1359         netif_tx_stop_all_queues(sdata->dev);
1360         netif_carrier_off(sdata->dev);
1361
1362         mutex_lock(&local->sta_mtx);
1363         sta = sta_info_get(sdata, bssid);
1364         if (sta) {
1365                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1366                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1367         }
1368         mutex_unlock(&local->sta_mtx);
1369
1370         /* deauthenticate/disassociate now */
1371         if (tx || frame_buf)
1372                 ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason,
1373                                                tx, frame_buf);
1374
1375         /* flush out frame */
1376         if (tx)
1377                 drv_flush(local, false);
1378
1379         /* remove AP and TDLS peers */
1380         sta_info_flush(local, sdata);
1381
1382         /* finally reset all BSS / config parameters */
1383         changed |= ieee80211_reset_erp_info(sdata);
1384
1385         ieee80211_led_assoc(local, 0);
1386         changed |= BSS_CHANGED_ASSOC;
1387         sdata->vif.bss_conf.assoc = false;
1388
1389         /* on the next assoc, re-program HT parameters */
1390         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1391         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1392
1393         local->power_constr_level = 0;
1394
1395         del_timer_sync(&local->dynamic_ps_timer);
1396         cancel_work_sync(&local->dynamic_ps_enable_work);
1397
1398         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1399                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1400                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1401         }
1402         local->ps_sdata = NULL;
1403
1404         /* Disable ARP filtering */
1405         if (sdata->vif.bss_conf.arp_filter_enabled) {
1406                 sdata->vif.bss_conf.arp_filter_enabled = false;
1407                 changed |= BSS_CHANGED_ARP_FILTER;
1408         }
1409
1410         sdata->vif.bss_conf.qos = false;
1411         changed |= BSS_CHANGED_QOS;
1412
1413         /* The BSSID (not really interesting) and HT changed */
1414         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1415         ieee80211_bss_info_change_notify(sdata, changed);
1416
1417         /* channel(_type) changes are handled by ieee80211_hw_config */
1418         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1419         ieee80211_hw_config(local, 0);
1420
1421         /* disassociated - set to defaults now */
1422         ieee80211_set_wmm_default(sdata, false);
1423
1424         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1425         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1426         del_timer_sync(&sdata->u.mgd.timer);
1427         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1428 }
1429
1430 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1431                              struct ieee80211_hdr *hdr)
1432 {
1433         /*
1434          * We can postpone the mgd.timer whenever receiving unicast frames
1435          * from AP because we know that the connection is working both ways
1436          * at that time. But multicast frames (and hence also beacons) must
1437          * be ignored here, because we need to trigger the timer during
1438          * data idle periods for sending the periodic probe request to the
1439          * AP we're connected to.
1440          */
1441         if (is_multicast_ether_addr(hdr->addr1))
1442                 return;
1443
1444         ieee80211_sta_reset_conn_monitor(sdata);
1445 }
1446
1447 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1448 {
1449         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1450         struct ieee80211_local *local = sdata->local;
1451
1452         mutex_lock(&local->mtx);
1453         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1454                               IEEE80211_STA_CONNECTION_POLL))) {
1455                 mutex_unlock(&local->mtx);
1456                 return;
1457         }
1458
1459         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1460                           IEEE80211_STA_BEACON_POLL);
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         ieee80211_run_deferred_scan(local);
1481         mutex_unlock(&local->mtx);
1482 }
1483
1484 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1485                              struct ieee80211_hdr *hdr, bool ack)
1486 {
1487         if (!ieee80211_is_data(hdr->frame_control))
1488             return;
1489
1490         if (ack)
1491                 ieee80211_sta_reset_conn_monitor(sdata);
1492
1493         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1494             sdata->u.mgd.probe_send_count > 0) {
1495                 if (ack)
1496                         sdata->u.mgd.probe_send_count = 0;
1497                 else
1498                         sdata->u.mgd.nullfunc_failed = true;
1499                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1500         }
1501 }
1502
1503 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1504 {
1505         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1506         const u8 *ssid;
1507         u8 *dst = ifmgd->associated->bssid;
1508         u8 unicast_limit = max(1, max_probe_tries - 3);
1509
1510         /*
1511          * Try sending broadcast probe requests for the last three
1512          * probe requests after the first ones failed since some
1513          * buggy APs only support broadcast probe requests.
1514          */
1515         if (ifmgd->probe_send_count >= unicast_limit)
1516                 dst = NULL;
1517
1518         /*
1519          * When the hardware reports an accurate Tx ACK status, it's
1520          * better to send a nullfunc frame instead of a probe request,
1521          * as it will kick us off the AP quickly if we aren't associated
1522          * anymore. The timeout will be reset if the frame is ACKed by
1523          * the AP.
1524          */
1525         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1526                 ifmgd->nullfunc_failed = false;
1527                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1528         } else {
1529                 int ssid_len;
1530
1531                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1532                 if (WARN_ON_ONCE(ssid == NULL))
1533                         ssid_len = 0;
1534                 else
1535                         ssid_len = ssid[1];
1536
1537                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1538                                          0, (u32) -1, true, false);
1539         }
1540
1541         ifmgd->probe_send_count++;
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 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1570         if (beacon)
1571                 net_dbg_ratelimited("%s: detected beacon loss from AP - sending probe request\n",
1572                                     sdata->name);
1573 #endif
1574
1575         /*
1576          * The driver/our work has already reported this event or the
1577          * connection monitoring has kicked in and we have already sent
1578          * a probe request. Or maybe the AP died and the driver keeps
1579          * reporting until we disassociate...
1580          *
1581          * In either case we have to ignore the current call to this
1582          * function (except for setting the correct probe reason bit)
1583          * because otherwise we would reset the timer every time and
1584          * never check whether we received a probe response!
1585          */
1586         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1587                             IEEE80211_STA_CONNECTION_POLL))
1588                 already = true;
1589
1590         if (beacon)
1591                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1592         else
1593                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1594
1595         mutex_unlock(&sdata->local->mtx);
1596
1597         if (already)
1598                 goto out;
1599
1600         mutex_lock(&sdata->local->iflist_mtx);
1601         ieee80211_recalc_ps(sdata->local, -1);
1602         mutex_unlock(&sdata->local->iflist_mtx);
1603
1604         ifmgd->probe_send_count = 0;
1605         ieee80211_mgd_probe_ap_send(sdata);
1606  out:
1607         mutex_unlock(&ifmgd->mtx);
1608 }
1609
1610 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1611                                           struct ieee80211_vif *vif)
1612 {
1613         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1614         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1615         struct sk_buff *skb;
1616         const u8 *ssid;
1617         int ssid_len;
1618
1619         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1620                 return NULL;
1621
1622         ASSERT_MGD_MTX(ifmgd);
1623
1624         if (!ifmgd->associated)
1625                 return NULL;
1626
1627         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1628         if (WARN_ON_ONCE(ssid == NULL))
1629                 ssid_len = 0;
1630         else
1631                 ssid_len = ssid[1];
1632
1633         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1634                                         (u32) -1, ssid + 2, ssid_len,
1635                                         NULL, 0, true);
1636
1637         return skb;
1638 }
1639 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1640
1641 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1642 {
1643         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1644         struct ieee80211_local *local = sdata->local;
1645         u8 bssid[ETH_ALEN];
1646         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1647
1648         mutex_lock(&ifmgd->mtx);
1649         if (!ifmgd->associated) {
1650                 mutex_unlock(&ifmgd->mtx);
1651                 return;
1652         }
1653
1654         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1655
1656         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1657                sdata->name, bssid);
1658
1659         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1660                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1661                                false, frame_buf);
1662         mutex_unlock(&ifmgd->mtx);
1663
1664         /*
1665          * must be outside lock due to cfg80211,
1666          * but that's not a problem.
1667          */
1668         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1669
1670         mutex_lock(&local->mtx);
1671         ieee80211_recalc_idle(local);
1672         mutex_unlock(&local->mtx);
1673 }
1674
1675 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1676 {
1677         struct ieee80211_sub_if_data *sdata =
1678                 container_of(work, struct ieee80211_sub_if_data,
1679                              u.mgd.beacon_connection_loss_work);
1680         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1681         struct sta_info *sta;
1682
1683         if (ifmgd->associated) {
1684                 rcu_read_lock();
1685                 sta = sta_info_get(sdata, ifmgd->bssid);
1686                 if (sta)
1687                         sta->beacon_loss_count++;
1688                 rcu_read_unlock();
1689         }
1690
1691         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1692                 __ieee80211_connection_loss(sdata);
1693         else
1694                 ieee80211_mgd_probe_ap(sdata, true);
1695 }
1696
1697 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1698 {
1699         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1700         struct ieee80211_hw *hw = &sdata->local->hw;
1701
1702         trace_api_beacon_loss(sdata);
1703
1704         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1705         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1706 }
1707 EXPORT_SYMBOL(ieee80211_beacon_loss);
1708
1709 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1710 {
1711         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1712         struct ieee80211_hw *hw = &sdata->local->hw;
1713
1714         trace_api_connection_loss(sdata);
1715
1716         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1717         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1718 }
1719 EXPORT_SYMBOL(ieee80211_connection_loss);
1720
1721
1722 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1723                                         bool assoc)
1724 {
1725         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1726
1727         lockdep_assert_held(&sdata->u.mgd.mtx);
1728
1729         if (!assoc) {
1730                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1731
1732                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1733                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1734         }
1735
1736         cfg80211_put_bss(auth_data->bss);
1737         kfree(auth_data);
1738         sdata->u.mgd.auth_data = NULL;
1739 }
1740
1741 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1742                                      struct ieee80211_mgmt *mgmt, size_t len)
1743 {
1744         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1745         u8 *pos;
1746         struct ieee802_11_elems elems;
1747
1748         pos = mgmt->u.auth.variable;
1749         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1750         if (!elems.challenge)
1751                 return;
1752         auth_data->expected_transaction = 4;
1753         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1754                             elems.challenge - 2, elems.challenge_len + 2,
1755                             auth_data->bss->bssid, auth_data->bss->bssid,
1756                             auth_data->key, auth_data->key_len,
1757                             auth_data->key_idx);
1758 }
1759
1760 static enum rx_mgmt_action __must_check
1761 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1762                        struct ieee80211_mgmt *mgmt, size_t len)
1763 {
1764         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1765         u8 bssid[ETH_ALEN];
1766         u16 auth_alg, auth_transaction, status_code;
1767         struct sta_info *sta;
1768
1769         lockdep_assert_held(&ifmgd->mtx);
1770
1771         if (len < 24 + 6)
1772                 return RX_MGMT_NONE;
1773
1774         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1775                 return RX_MGMT_NONE;
1776
1777         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1778
1779         if (!ether_addr_equal(bssid, mgmt->bssid))
1780                 return RX_MGMT_NONE;
1781
1782         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1783         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1784         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1785
1786         if (auth_alg != ifmgd->auth_data->algorithm ||
1787             auth_transaction != ifmgd->auth_data->expected_transaction)
1788                 return RX_MGMT_NONE;
1789
1790         if (status_code != WLAN_STATUS_SUCCESS) {
1791                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
1792                        sdata->name, mgmt->sa, status_code);
1793                 goto out;
1794         }
1795
1796         switch (ifmgd->auth_data->algorithm) {
1797         case WLAN_AUTH_OPEN:
1798         case WLAN_AUTH_LEAP:
1799         case WLAN_AUTH_FT:
1800                 break;
1801         case WLAN_AUTH_SHARED_KEY:
1802                 if (ifmgd->auth_data->expected_transaction != 4) {
1803                         ieee80211_auth_challenge(sdata, mgmt, len);
1804                         /* need another frame */
1805                         return RX_MGMT_NONE;
1806                 }
1807                 break;
1808         default:
1809                 WARN_ONCE(1, "invalid auth alg %d",
1810                           ifmgd->auth_data->algorithm);
1811                 return RX_MGMT_NONE;
1812         }
1813
1814         printk(KERN_DEBUG "%s: authenticated\n", sdata->name);
1815  out:
1816         ifmgd->auth_data->done = true;
1817         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1818         run_again(ifmgd, ifmgd->auth_data->timeout);
1819
1820         /* move station state to auth */
1821         mutex_lock(&sdata->local->sta_mtx);
1822         sta = sta_info_get(sdata, bssid);
1823         if (!sta) {
1824                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1825                 goto out_err;
1826         }
1827         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1828                 printk(KERN_DEBUG "%s: failed moving %pM to auth\n",
1829                        sdata->name, bssid);
1830                 goto out_err;
1831         }
1832         mutex_unlock(&sdata->local->sta_mtx);
1833
1834         return RX_MGMT_CFG80211_RX_AUTH;
1835  out_err:
1836         mutex_unlock(&sdata->local->sta_mtx);
1837         /* ignore frame -- wait for timeout */
1838         return RX_MGMT_NONE;
1839 }
1840
1841
1842 static enum rx_mgmt_action __must_check
1843 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1844                          struct ieee80211_mgmt *mgmt, size_t len)
1845 {
1846         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1847         const u8 *bssid = NULL;
1848         u16 reason_code;
1849
1850         lockdep_assert_held(&ifmgd->mtx);
1851
1852         if (len < 24 + 2)
1853                 return RX_MGMT_NONE;
1854
1855         if (!ifmgd->associated ||
1856             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1857                 return RX_MGMT_NONE;
1858
1859         bssid = ifmgd->associated->bssid;
1860
1861         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1862
1863         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1864                         sdata->name, bssid, reason_code);
1865
1866         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1867
1868         mutex_lock(&sdata->local->mtx);
1869         ieee80211_recalc_idle(sdata->local);
1870         mutex_unlock(&sdata->local->mtx);
1871
1872         return RX_MGMT_CFG80211_DEAUTH;
1873 }
1874
1875
1876 static enum rx_mgmt_action __must_check
1877 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1878                            struct ieee80211_mgmt *mgmt, size_t len)
1879 {
1880         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1881         u16 reason_code;
1882
1883         lockdep_assert_held(&ifmgd->mtx);
1884
1885         if (len < 24 + 2)
1886                 return RX_MGMT_NONE;
1887
1888         if (!ifmgd->associated ||
1889             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1890                 return RX_MGMT_NONE;
1891
1892         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1893
1894         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1895                         sdata->name, mgmt->sa, reason_code);
1896
1897         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1898
1899         mutex_lock(&sdata->local->mtx);
1900         ieee80211_recalc_idle(sdata->local);
1901         mutex_unlock(&sdata->local->mtx);
1902
1903         return RX_MGMT_CFG80211_DISASSOC;
1904 }
1905
1906 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1907                                 u8 *supp_rates, unsigned int supp_rates_len,
1908                                 u32 *rates, u32 *basic_rates,
1909                                 bool *have_higher_than_11mbit,
1910                                 int *min_rate, int *min_rate_index)
1911 {
1912         int i, j;
1913
1914         for (i = 0; i < supp_rates_len; i++) {
1915                 int rate = (supp_rates[i] & 0x7f) * 5;
1916                 bool is_basic = !!(supp_rates[i] & 0x80);
1917
1918                 if (rate > 110)
1919                         *have_higher_than_11mbit = true;
1920
1921                 /*
1922                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1923                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1924                  *
1925                  * Note: Even through the membership selector and the basic
1926                  *       rate flag share the same bit, they are not exactly
1927                  *       the same.
1928                  */
1929                 if (!!(supp_rates[i] & 0x80) &&
1930                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1931                         continue;
1932
1933                 for (j = 0; j < sband->n_bitrates; j++) {
1934                         if (sband->bitrates[j].bitrate == rate) {
1935                                 *rates |= BIT(j);
1936                                 if (is_basic)
1937                                         *basic_rates |= BIT(j);
1938                                 if (rate < *min_rate) {
1939                                         *min_rate = rate;
1940                                         *min_rate_index = j;
1941                                 }
1942                                 break;
1943                         }
1944                 }
1945         }
1946 }
1947
1948 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1949                                          bool assoc)
1950 {
1951         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1952
1953         lockdep_assert_held(&sdata->u.mgd.mtx);
1954
1955         if (!assoc) {
1956                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1957
1958                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1959                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1960         }
1961
1962         kfree(assoc_data);
1963         sdata->u.mgd.assoc_data = NULL;
1964 }
1965
1966 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1967                                     struct cfg80211_bss *cbss,
1968                                     struct ieee80211_mgmt *mgmt, size_t len)
1969 {
1970         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1971         struct ieee80211_local *local = sdata->local;
1972         struct ieee80211_supported_band *sband;
1973         struct sta_info *sta;
1974         u8 *pos;
1975         u16 capab_info, aid;
1976         struct ieee802_11_elems elems;
1977         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1978         u32 changed = 0;
1979         int err;
1980
1981         /* AssocResp and ReassocResp have identical structure */
1982
1983         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1984         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1985
1986         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1987                 printk(KERN_DEBUG
1988                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
1989                        sdata->name, aid);
1990         aid &= ~(BIT(15) | BIT(14));
1991
1992         ifmgd->broken_ap = false;
1993
1994         if (aid == 0 || aid > IEEE80211_MAX_AID) {
1995                 printk(KERN_DEBUG
1996                        "%s: invalid AID value %d (out of range), turn off PS\n",
1997                        sdata->name, aid);
1998                 aid = 0;
1999                 ifmgd->broken_ap = true;
2000         }
2001
2002         pos = mgmt->u.assoc_resp.variable;
2003         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2004
2005         if (!elems.supp_rates) {
2006                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2007                        sdata->name);
2008                 return false;
2009         }
2010
2011         ifmgd->aid = aid;
2012
2013         mutex_lock(&sdata->local->sta_mtx);
2014         /*
2015          * station info was already allocated and inserted before
2016          * the association and should be available to us
2017          */
2018         sta = sta_info_get(sdata, cbss->bssid);
2019         if (WARN_ON(!sta)) {
2020                 mutex_unlock(&sdata->local->sta_mtx);
2021                 return false;
2022         }
2023
2024         sband = local->hw.wiphy->bands[local->oper_channel->band];
2025
2026         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2027                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2028                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2029
2030         sta->supports_40mhz =
2031                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2032
2033         rate_control_rate_init(sta);
2034
2035         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2036                 set_sta_flag(sta, WLAN_STA_MFP);
2037
2038         if (elems.wmm_param)
2039                 set_sta_flag(sta, WLAN_STA_WME);
2040
2041         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2042         if (!err)
2043                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2044         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2045                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2046         if (err) {
2047                 printk(KERN_DEBUG
2048                        "%s: failed to move station %pM to desired state\n",
2049                        sdata->name, sta->sta.addr);
2050                 WARN_ON(__sta_info_destroy(sta));
2051                 mutex_unlock(&sdata->local->sta_mtx);
2052                 return false;
2053         }
2054
2055         mutex_unlock(&sdata->local->sta_mtx);
2056
2057         /*
2058          * Always handle WMM once after association regardless
2059          * of the first value the AP uses. Setting -1 here has
2060          * that effect because the AP values is an unsigned
2061          * 4-bit value.
2062          */
2063         ifmgd->wmm_last_param_set = -1;
2064
2065         if (elems.wmm_param)
2066                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2067                                          elems.wmm_param_len);
2068         else
2069                 ieee80211_set_wmm_default(sdata, false);
2070         changed |= BSS_CHANGED_QOS;
2071
2072         if (elems.ht_operation && elems.wmm_param &&
2073             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2074                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2075                                                   cbss->bssid, false);
2076
2077         /* set AID and assoc capability,
2078          * ieee80211_set_associated() will tell the driver */
2079         bss_conf->aid = aid;
2080         bss_conf->assoc_capability = capab_info;
2081         ieee80211_set_associated(sdata, cbss, changed);
2082
2083         /*
2084          * If we're using 4-addr mode, let the AP know that we're
2085          * doing so, so that it can create the STA VLAN on its side
2086          */
2087         if (ifmgd->use_4addr)
2088                 ieee80211_send_4addr_nullfunc(local, sdata);
2089
2090         /*
2091          * Start timer to probe the connection to the AP now.
2092          * Also start the timer that will detect beacon loss.
2093          */
2094         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2095         ieee80211_sta_reset_beacon_monitor(sdata);
2096
2097         return true;
2098 }
2099
2100 static enum rx_mgmt_action __must_check
2101 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2102                              struct ieee80211_mgmt *mgmt, size_t len,
2103                              struct cfg80211_bss **bss)
2104 {
2105         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2106         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2107         u16 capab_info, status_code, aid;
2108         struct ieee802_11_elems elems;
2109         u8 *pos;
2110         bool reassoc;
2111
2112         lockdep_assert_held(&ifmgd->mtx);
2113
2114         if (!assoc_data)
2115                 return RX_MGMT_NONE;
2116         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2117                 return RX_MGMT_NONE;
2118
2119         /*
2120          * AssocResp and ReassocResp have identical structure, so process both
2121          * of them in this function.
2122          */
2123
2124         if (len < 24 + 6)
2125                 return RX_MGMT_NONE;
2126
2127         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2128         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2129         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2130         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2131
2132         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
2133                "status=%d aid=%d)\n",
2134                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
2135                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2136
2137         pos = mgmt->u.assoc_resp.variable;
2138         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2139
2140         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2141             elems.timeout_int && elems.timeout_int_len == 5 &&
2142             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2143                 u32 tu, ms;
2144                 tu = get_unaligned_le32(elems.timeout_int + 1);
2145                 ms = tu * 1024 / 1000;
2146                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
2147                        "comeback duration %u TU (%u ms)\n",
2148                        sdata->name, mgmt->sa, tu, ms);
2149                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2150                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2151                         run_again(ifmgd, assoc_data->timeout);
2152                 return RX_MGMT_NONE;
2153         }
2154
2155         *bss = assoc_data->bss;
2156
2157         if (status_code != WLAN_STATUS_SUCCESS) {
2158                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
2159                        sdata->name, mgmt->sa, status_code);
2160                 ieee80211_destroy_assoc_data(sdata, false);
2161         } else {
2162                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
2163
2164                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2165                         /* oops -- internal error -- send timeout for now */
2166                         ieee80211_destroy_assoc_data(sdata, true);
2167                         sta_info_destroy_addr(sdata, mgmt->bssid);
2168                         cfg80211_put_bss(*bss);
2169                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2170                 }
2171
2172                 /*
2173                  * destroy assoc_data afterwards, as otherwise an idle
2174                  * recalc after assoc_data is NULL but before associated
2175                  * is set can cause the interface to go idle
2176                  */
2177                 ieee80211_destroy_assoc_data(sdata, true);
2178         }
2179
2180         return RX_MGMT_CFG80211_RX_ASSOC;
2181 }
2182 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2183                                   struct ieee80211_mgmt *mgmt,
2184                                   size_t len,
2185                                   struct ieee80211_rx_status *rx_status,
2186                                   struct ieee802_11_elems *elems,
2187                                   bool beacon)
2188 {
2189         struct ieee80211_local *local = sdata->local;
2190         int freq;
2191         struct ieee80211_bss *bss;
2192         struct ieee80211_channel *channel;
2193         bool need_ps = false;
2194
2195         if (sdata->u.mgd.associated &&
2196             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2197                 bss = (void *)sdata->u.mgd.associated->priv;
2198                 /* not previously set so we may need to recalc */
2199                 need_ps = !bss->dtim_period;
2200         }
2201
2202         if (elems->ds_params && elems->ds_params_len == 1)
2203                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2204                                                       rx_status->band);
2205         else
2206                 freq = rx_status->freq;
2207
2208         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2209
2210         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2211                 return;
2212
2213         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2214                                         channel, beacon);
2215         if (bss)
2216                 ieee80211_rx_bss_put(local, bss);
2217
2218         if (!sdata->u.mgd.associated)
2219                 return;
2220
2221         if (need_ps) {
2222                 mutex_lock(&local->iflist_mtx);
2223                 ieee80211_recalc_ps(local, -1);
2224                 mutex_unlock(&local->iflist_mtx);
2225         }
2226
2227         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2228             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2229                                                         ETH_ALEN) == 0)) {
2230                 struct ieee80211_channel_sw_ie *sw_elem =
2231                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2232                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2233                                                  bss, rx_status->mactime);
2234         }
2235 }
2236
2237
2238 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2239                                          struct sk_buff *skb)
2240 {
2241         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2242         struct ieee80211_if_managed *ifmgd;
2243         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2244         size_t baselen, len = skb->len;
2245         struct ieee802_11_elems elems;
2246
2247         ifmgd = &sdata->u.mgd;
2248
2249         ASSERT_MGD_MTX(ifmgd);
2250
2251         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2252                 return; /* ignore ProbeResp to foreign address */
2253
2254         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2255         if (baselen > len)
2256                 return;
2257
2258         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2259                                 &elems);
2260
2261         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2262
2263         if (ifmgd->associated &&
2264             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2265                 ieee80211_reset_ap_probe(sdata);
2266
2267         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2268             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2269                 /* got probe response, continue with auth */
2270                 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
2271                 ifmgd->auth_data->tries = 0;
2272                 ifmgd->auth_data->timeout = jiffies;
2273                 run_again(ifmgd, ifmgd->auth_data->timeout);
2274         }
2275 }
2276
2277 /*
2278  * This is the canonical list of information elements we care about,
2279  * the filter code also gives us all changes to the Microsoft OUI
2280  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2281  *
2282  * We implement beacon filtering in software since that means we can
2283  * avoid processing the frame here and in cfg80211, and userspace
2284  * will not be able to tell whether the hardware supports it or not.
2285  *
2286  * XXX: This list needs to be dynamic -- userspace needs to be able to
2287  *      add items it requires. It also needs to be able to tell us to
2288  *      look out for other vendor IEs.
2289  */
2290 static const u64 care_about_ies =
2291         (1ULL << WLAN_EID_COUNTRY) |
2292         (1ULL << WLAN_EID_ERP_INFO) |
2293         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2294         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2295         (1ULL << WLAN_EID_HT_CAPABILITY) |
2296         (1ULL << WLAN_EID_HT_OPERATION);
2297
2298 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2299                                      struct ieee80211_mgmt *mgmt,
2300                                      size_t len,
2301                                      struct ieee80211_rx_status *rx_status)
2302 {
2303         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2304         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2305         size_t baselen;
2306         struct ieee802_11_elems elems;
2307         struct ieee80211_local *local = sdata->local;
2308         u32 changed = 0;
2309         bool erp_valid, directed_tim = false;
2310         u8 erp_value = 0;
2311         u32 ncrc;
2312         u8 *bssid;
2313
2314         lockdep_assert_held(&ifmgd->mtx);
2315
2316         /* Process beacon from the current BSS */
2317         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2318         if (baselen > len)
2319                 return;
2320
2321         if (rx_status->freq != local->hw.conf.channel->center_freq)
2322                 return;
2323
2324         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2325             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2326                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2327                                        len - baselen, &elems);
2328
2329                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2330                                       false);
2331                 ifmgd->assoc_data->have_beacon = true;
2332                 ifmgd->assoc_data->sent_assoc = false;
2333                 /* continue assoc process */
2334                 ifmgd->assoc_data->timeout = jiffies;
2335                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2336                 return;
2337         }
2338
2339         if (!ifmgd->associated ||
2340             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2341                 return;
2342         bssid = ifmgd->associated->bssid;
2343
2344         /* Track average RSSI from the Beacon frames of the current AP */
2345         ifmgd->last_beacon_signal = rx_status->signal;
2346         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2347                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2348                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2349                 ifmgd->last_cqm_event_signal = 0;
2350                 ifmgd->count_beacon_signal = 1;
2351                 ifmgd->last_ave_beacon_signal = 0;
2352         } else {
2353                 ifmgd->ave_beacon_signal =
2354                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2355                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2356                          ifmgd->ave_beacon_signal) / 16;
2357                 ifmgd->count_beacon_signal++;
2358         }
2359
2360         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2361             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2362                 int sig = ifmgd->ave_beacon_signal;
2363                 int last_sig = ifmgd->last_ave_beacon_signal;
2364
2365                 /*
2366                  * if signal crosses either of the boundaries, invoke callback
2367                  * with appropriate parameters
2368                  */
2369                 if (sig > ifmgd->rssi_max_thold &&
2370                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2371                         ifmgd->last_ave_beacon_signal = sig;
2372                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2373                 } else if (sig < ifmgd->rssi_min_thold &&
2374                            (last_sig >= ifmgd->rssi_max_thold ||
2375                            last_sig == 0)) {
2376                         ifmgd->last_ave_beacon_signal = sig;
2377                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2378                 }
2379         }
2380
2381         if (bss_conf->cqm_rssi_thold &&
2382             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2383             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2384                 int sig = ifmgd->ave_beacon_signal / 16;
2385                 int last_event = ifmgd->last_cqm_event_signal;
2386                 int thold = bss_conf->cqm_rssi_thold;
2387                 int hyst = bss_conf->cqm_rssi_hyst;
2388                 if (sig < thold &&
2389                     (last_event == 0 || sig < last_event - hyst)) {
2390                         ifmgd->last_cqm_event_signal = sig;
2391                         ieee80211_cqm_rssi_notify(
2392                                 &sdata->vif,
2393                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2394                                 GFP_KERNEL);
2395                 } else if (sig > thold &&
2396                            (last_event == 0 || sig > last_event + hyst)) {
2397                         ifmgd->last_cqm_event_signal = sig;
2398                         ieee80211_cqm_rssi_notify(
2399                                 &sdata->vif,
2400                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2401                                 GFP_KERNEL);
2402                 }
2403         }
2404
2405         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2406 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2407                 net_dbg_ratelimited("%s: cancelling probereq poll due to a received beacon\n",
2408                                     sdata->name);
2409 #endif
2410                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2411                 mutex_lock(&local->iflist_mtx);
2412                 ieee80211_recalc_ps(local, -1);
2413                 mutex_unlock(&local->iflist_mtx);
2414         }
2415
2416         /*
2417          * Push the beacon loss detection into the future since
2418          * we are processing a beacon from the AP just now.
2419          */
2420         ieee80211_sta_reset_beacon_monitor(sdata);
2421
2422         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2423         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2424                                           len - baselen, &elems,
2425                                           care_about_ies, ncrc);
2426
2427         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2428                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2429                                                    ifmgd->aid);
2430
2431         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
2432                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2433                                       true);
2434
2435                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2436                                          elems.wmm_param_len);
2437         }
2438
2439         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2440                 if (directed_tim) {
2441                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2442                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2443                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2444                                         ieee80211_hw_config(local,
2445                                                             IEEE80211_CONF_CHANGE_PS);
2446                                 }
2447                                 ieee80211_send_nullfunc(local, sdata, 0);
2448                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2449                                 local->pspolling = true;
2450
2451                                 /*
2452                                  * Here is assumed that the driver will be
2453                                  * able to send ps-poll frame and receive a
2454                                  * response even though power save mode is
2455                                  * enabled, but some drivers might require
2456                                  * to disable power save here. This needs
2457                                  * to be investigated.
2458                                  */
2459                                 ieee80211_send_pspoll(local, sdata);
2460                         }
2461                 }
2462         }
2463
2464         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2465                 return;
2466         ifmgd->beacon_crc = ncrc;
2467         ifmgd->beacon_crc_valid = true;
2468
2469         if (elems.erp_info && elems.erp_info_len >= 1) {
2470                 erp_valid = true;
2471                 erp_value = elems.erp_info[0];
2472         } else {
2473                 erp_valid = false;
2474         }
2475         changed |= ieee80211_handle_bss_capability(sdata,
2476                         le16_to_cpu(mgmt->u.beacon.capab_info),
2477                         erp_valid, erp_value);
2478
2479
2480         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2481             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2482                 struct ieee80211_supported_band *sband;
2483
2484                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2485
2486                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2487                                                   bssid, true);
2488         }
2489
2490         /* Note: country IE parsing is done for us by cfg80211 */
2491         if (elems.country_elem) {
2492                 /* TODO: IBSS also needs this */
2493                 if (elems.pwr_constr_elem)
2494                         ieee80211_handle_pwr_constr(sdata,
2495                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2496                                 elems.pwr_constr_elem,
2497                                 elems.pwr_constr_elem_len);
2498         }
2499
2500         ieee80211_bss_info_change_notify(sdata, changed);
2501 }
2502
2503 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2504                                   struct sk_buff *skb)
2505 {
2506         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2507         struct ieee80211_rx_status *rx_status;
2508         struct ieee80211_mgmt *mgmt;
2509         struct cfg80211_bss *bss = NULL;
2510         enum rx_mgmt_action rma = RX_MGMT_NONE;
2511         u16 fc;
2512
2513         rx_status = (struct ieee80211_rx_status *) skb->cb;
2514         mgmt = (struct ieee80211_mgmt *) skb->data;
2515         fc = le16_to_cpu(mgmt->frame_control);
2516
2517         mutex_lock(&ifmgd->mtx);
2518
2519         switch (fc & IEEE80211_FCTL_STYPE) {
2520         case IEEE80211_STYPE_BEACON:
2521                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2522                 break;
2523         case IEEE80211_STYPE_PROBE_RESP:
2524                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2525                 break;
2526         case IEEE80211_STYPE_AUTH:
2527                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2528                 break;
2529         case IEEE80211_STYPE_DEAUTH:
2530                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2531                 break;
2532         case IEEE80211_STYPE_DISASSOC:
2533                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2534                 break;
2535         case IEEE80211_STYPE_ASSOC_RESP:
2536         case IEEE80211_STYPE_REASSOC_RESP:
2537                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2538                 break;
2539         case IEEE80211_STYPE_ACTION:
2540                 switch (mgmt->u.action.category) {
2541                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2542                         ieee80211_sta_process_chanswitch(sdata,
2543                                         &mgmt->u.action.u.chan_switch.sw_elem,
2544                                         (void *)ifmgd->associated->priv,
2545                                         rx_status->mactime);
2546                         break;
2547                 }
2548         }
2549         mutex_unlock(&ifmgd->mtx);
2550
2551         switch (rma) {
2552         case RX_MGMT_NONE:
2553                 /* no action */
2554                 break;
2555         case RX_MGMT_CFG80211_DEAUTH:
2556                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2557                 break;
2558         case RX_MGMT_CFG80211_DISASSOC:
2559                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2560                 break;
2561         case RX_MGMT_CFG80211_RX_AUTH:
2562                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2563                 break;
2564         case RX_MGMT_CFG80211_RX_ASSOC:
2565                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2566                 break;
2567         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2568                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2569                 break;
2570         default:
2571                 WARN(1, "unexpected: %d", rma);
2572         }
2573 }
2574
2575 static void ieee80211_sta_timer(unsigned long data)
2576 {
2577         struct ieee80211_sub_if_data *sdata =
2578                 (struct ieee80211_sub_if_data *) data;
2579         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2580         struct ieee80211_local *local = sdata->local;
2581
2582         if (local->quiescing) {
2583                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2584                 return;
2585         }
2586
2587         ieee80211_queue_work(&local->hw, &sdata->work);
2588 }
2589
2590 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2591                                           u8 *bssid, u8 reason)
2592 {
2593         struct ieee80211_local *local = sdata->local;
2594         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2595         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2596
2597         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2598                           IEEE80211_STA_BEACON_POLL);
2599
2600         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2601                                false, frame_buf);
2602         mutex_unlock(&ifmgd->mtx);
2603
2604         /*
2605          * must be outside lock due to cfg80211,
2606          * but that's not a problem.
2607          */
2608         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2609
2610         mutex_lock(&local->mtx);
2611         ieee80211_recalc_idle(local);
2612         mutex_unlock(&local->mtx);
2613
2614         mutex_lock(&ifmgd->mtx);
2615 }
2616
2617 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2618 {
2619         struct ieee80211_local *local = sdata->local;
2620         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2621         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2622
2623         lockdep_assert_held(&ifmgd->mtx);
2624
2625         if (WARN_ON_ONCE(!auth_data))
2626                 return -EINVAL;
2627
2628         auth_data->tries++;
2629
2630         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2631                 printk(KERN_DEBUG "%s: authentication with %pM timed out\n",
2632                        sdata->name, auth_data->bss->bssid);
2633
2634                 /*
2635                  * Most likely AP is not in the range so remove the
2636                  * bss struct for that AP.
2637                  */
2638                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2639
2640                 return -ETIMEDOUT;
2641         }
2642
2643         if (auth_data->bss->proberesp_ies) {
2644                 printk(KERN_DEBUG "%s: send auth to %pM (try %d/%d)\n",
2645                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2646                        IEEE80211_AUTH_MAX_TRIES);
2647
2648                 auth_data->expected_transaction = 2;
2649                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2650                                     auth_data->ie, auth_data->ie_len,
2651                                     auth_data->bss->bssid,
2652                                     auth_data->bss->bssid, NULL, 0, 0);
2653         } else {
2654                 const u8 *ssidie;
2655
2656                 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
2657                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2658                        IEEE80211_AUTH_MAX_TRIES);
2659
2660                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2661                 if (!ssidie)
2662                         return -EINVAL;
2663                 /*
2664                  * Direct probe is sent to broadcast address as some APs
2665                  * will not answer to direct packet in unassociated state.
2666                  */
2667                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2668                                          NULL, 0, (u32) -1, true, false);
2669         }
2670
2671         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2672         run_again(ifmgd, auth_data->timeout);
2673
2674         return 0;
2675 }
2676
2677 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2678 {
2679         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2680         struct ieee80211_local *local = sdata->local;
2681
2682         lockdep_assert_held(&sdata->u.mgd.mtx);
2683
2684         assoc_data->tries++;
2685         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2686                 printk(KERN_DEBUG "%s: association with %pM timed out\n",
2687                        sdata->name, assoc_data->bss->bssid);
2688
2689                 /*
2690                  * Most likely AP is not in the range so remove the
2691                  * bss struct for that AP.
2692                  */
2693                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2694
2695                 return -ETIMEDOUT;
2696         }
2697
2698         printk(KERN_DEBUG "%s: associate with %pM (try %d/%d)\n",
2699                sdata->name, assoc_data->bss->bssid, assoc_data->tries,
2700                IEEE80211_ASSOC_MAX_TRIES);
2701         ieee80211_send_assoc(sdata);
2702
2703         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2704         run_again(&sdata->u.mgd, assoc_data->timeout);
2705
2706         return 0;
2707 }
2708
2709 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2710 {
2711         struct ieee80211_local *local = sdata->local;
2712         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2713
2714         mutex_lock(&ifmgd->mtx);
2715
2716         if (ifmgd->auth_data &&
2717             time_after(jiffies, ifmgd->auth_data->timeout)) {
2718                 if (ifmgd->auth_data->done) {
2719                         /*
2720                          * ok ... we waited for assoc but userspace didn't,
2721                          * so let's just kill the auth data
2722                          */
2723                         ieee80211_destroy_auth_data(sdata, false);
2724                 } else if (ieee80211_probe_auth(sdata)) {
2725                         u8 bssid[ETH_ALEN];
2726
2727                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2728
2729                         ieee80211_destroy_auth_data(sdata, false);
2730
2731                         mutex_unlock(&ifmgd->mtx);
2732                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2733                         mutex_lock(&ifmgd->mtx);
2734                 }
2735         } else if (ifmgd->auth_data)
2736                 run_again(ifmgd, ifmgd->auth_data->timeout);
2737
2738         if (ifmgd->assoc_data &&
2739             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2740                 if (!ifmgd->assoc_data->have_beacon ||
2741                     ieee80211_do_assoc(sdata)) {
2742                         u8 bssid[ETH_ALEN];
2743
2744                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2745
2746                         ieee80211_destroy_assoc_data(sdata, false);
2747
2748                         mutex_unlock(&ifmgd->mtx);
2749                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2750                         mutex_lock(&ifmgd->mtx);
2751                 }
2752         } else if (ifmgd->assoc_data)
2753                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2754
2755         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2756                             IEEE80211_STA_CONNECTION_POLL) &&
2757             ifmgd->associated) {
2758                 u8 bssid[ETH_ALEN];
2759                 int max_tries;
2760
2761                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2762
2763                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2764                         max_tries = max_nullfunc_tries;
2765                 else
2766                         max_tries = max_probe_tries;
2767
2768                 /* ACK received for nullfunc probing frame */
2769                 if (!ifmgd->probe_send_count)
2770                         ieee80211_reset_ap_probe(sdata);
2771                 else if (ifmgd->nullfunc_failed) {
2772                         if (ifmgd->probe_send_count < max_tries) {
2773 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2774                                 wiphy_debug(local->hw.wiphy,
2775                                             "%s: No ack for nullfunc frame to"
2776                                             " AP %pM, try %d/%i\n",
2777                                             sdata->name, bssid,
2778                                             ifmgd->probe_send_count, max_tries);
2779 #endif
2780                                 ieee80211_mgd_probe_ap_send(sdata);
2781                         } else {
2782 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2783                                 wiphy_debug(local->hw.wiphy,
2784                                             "%s: No ack for nullfunc frame to"
2785                                             " AP %pM, disconnecting.\n",
2786                                             sdata->name, bssid);
2787 #endif
2788                                 ieee80211_sta_connection_lost(sdata, bssid,
2789                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2790                         }
2791                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2792                         run_again(ifmgd, ifmgd->probe_timeout);
2793                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2794 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2795                         wiphy_debug(local->hw.wiphy,
2796                                     "%s: Failed to send nullfunc to AP %pM"
2797                                     " after %dms, disconnecting.\n",
2798                                     sdata->name,
2799                                     bssid, probe_wait_ms);
2800 #endif
2801                         ieee80211_sta_connection_lost(sdata, bssid,
2802                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2803                 } else if (ifmgd->probe_send_count < max_tries) {
2804 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2805                         wiphy_debug(local->hw.wiphy,
2806                                     "%s: No probe response from AP %pM"
2807                                     " after %dms, try %d/%i\n",
2808                                     sdata->name,
2809                                     bssid, probe_wait_ms,
2810                                     ifmgd->probe_send_count, max_tries);
2811 #endif
2812                         ieee80211_mgd_probe_ap_send(sdata);
2813                 } else {
2814                         /*
2815                          * We actually lost the connection ... or did we?
2816                          * Let's make sure!
2817                          */
2818                         wiphy_debug(local->hw.wiphy,
2819                                     "%s: No probe response from AP %pM"
2820                                     " after %dms, disconnecting.\n",
2821                                     sdata->name,
2822                                     bssid, probe_wait_ms);
2823
2824                         ieee80211_sta_connection_lost(sdata, bssid,
2825                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2826                 }
2827         }
2828
2829         mutex_unlock(&ifmgd->mtx);
2830
2831         mutex_lock(&local->mtx);
2832         ieee80211_recalc_idle(local);
2833         mutex_unlock(&local->mtx);
2834 }
2835
2836 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2837 {
2838         struct ieee80211_sub_if_data *sdata =
2839                 (struct ieee80211_sub_if_data *) data;
2840         struct ieee80211_local *local = sdata->local;
2841
2842         if (local->quiescing)
2843                 return;
2844
2845         ieee80211_queue_work(&sdata->local->hw,
2846                              &sdata->u.mgd.beacon_connection_loss_work);
2847 }
2848
2849 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2850 {
2851         struct ieee80211_sub_if_data *sdata =
2852                 (struct ieee80211_sub_if_data *) data;
2853         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2854         struct ieee80211_local *local = sdata->local;
2855
2856         if (local->quiescing)
2857                 return;
2858
2859         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2860 }
2861
2862 static void ieee80211_sta_monitor_work(struct work_struct *work)
2863 {
2864         struct ieee80211_sub_if_data *sdata =
2865                 container_of(work, struct ieee80211_sub_if_data,
2866                              u.mgd.monitor_work);
2867
2868         ieee80211_mgd_probe_ap(sdata, false);
2869 }
2870
2871 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2872 {
2873         u32 flags;
2874
2875         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2876                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2877                                         IEEE80211_STA_CONNECTION_POLL);
2878
2879                 /* let's probe the connection once */
2880                 flags = sdata->local->hw.flags;
2881                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2882                         ieee80211_queue_work(&sdata->local->hw,
2883                                              &sdata->u.mgd.monitor_work);
2884                 /* and do all the other regular work too */
2885                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2886         }
2887 }
2888
2889 #ifdef CONFIG_PM
2890 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2891 {
2892         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2893
2894         /*
2895          * we need to use atomic bitops for the running bits
2896          * only because both timers might fire at the same
2897          * time -- the code here is properly synchronised.
2898          */
2899
2900         cancel_work_sync(&ifmgd->request_smps_work);
2901
2902         cancel_work_sync(&ifmgd->monitor_work);
2903         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2904         if (del_timer_sync(&ifmgd->timer))
2905                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2906
2907         cancel_work_sync(&ifmgd->chswitch_work);
2908         if (del_timer_sync(&ifmgd->chswitch_timer))
2909                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2910
2911         /* these will just be re-established on connection */
2912         del_timer_sync(&ifmgd->conn_mon_timer);
2913         del_timer_sync(&ifmgd->bcn_mon_timer);
2914 }
2915
2916 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2917 {
2918         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2919
2920         if (!ifmgd->associated)
2921                 return;
2922
2923         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2924                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2925                 mutex_lock(&ifmgd->mtx);
2926                 if (ifmgd->associated) {
2927 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2928                         wiphy_debug(sdata->local->hw.wiphy,
2929                                     "%s: driver requested disconnect after resume.\n",
2930                                     sdata->name);
2931 #endif
2932                         ieee80211_sta_connection_lost(sdata,
2933                                 ifmgd->associated->bssid,
2934                                 WLAN_REASON_UNSPECIFIED);
2935                         mutex_unlock(&ifmgd->mtx);
2936                         return;
2937                 }
2938                 mutex_unlock(&ifmgd->mtx);
2939         }
2940
2941         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2942                 add_timer(&ifmgd->timer);
2943         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2944                 add_timer(&ifmgd->chswitch_timer);
2945         ieee80211_sta_reset_beacon_monitor(sdata);
2946         ieee80211_restart_sta_timer(sdata);
2947 }
2948 #endif
2949
2950 /* interface setup */
2951 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2952 {
2953         struct ieee80211_if_managed *ifmgd;
2954
2955         ifmgd = &sdata->u.mgd;
2956         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2957         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2958         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2959                   ieee80211_beacon_connection_loss_work);
2960         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2961         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2962                     (unsigned long) sdata);
2963         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2964                     (unsigned long) sdata);
2965         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2966                     (unsigned long) sdata);
2967         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2968                     (unsigned long) sdata);
2969
2970         ifmgd->flags = 0;
2971         ifmgd->powersave = sdata->wdev.ps;
2972         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2973         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2974
2975         mutex_init(&ifmgd->mtx);
2976
2977         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2978                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2979         else
2980                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2981 }
2982
2983 /* scan finished notification */
2984 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2985 {
2986         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2987
2988         /* Restart STA timers */
2989         rcu_read_lock();
2990         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2991                 ieee80211_restart_sta_timer(sdata);
2992         rcu_read_unlock();
2993 }
2994
2995 int ieee80211_max_network_latency(struct notifier_block *nb,
2996                                   unsigned long data, void *dummy)
2997 {
2998         s32 latency_usec = (s32) data;
2999         struct ieee80211_local *local =
3000                 container_of(nb, struct ieee80211_local,
3001                              network_latency_notifier);
3002
3003         mutex_lock(&local->iflist_mtx);
3004         ieee80211_recalc_ps(local, latency_usec);
3005         mutex_unlock(&local->iflist_mtx);
3006
3007         return 0;
3008 }
3009
3010 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3011                                      struct cfg80211_bss *cbss, bool assoc)
3012 {
3013         struct ieee80211_local *local = sdata->local;
3014         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3015         struct ieee80211_bss *bss = (void *)cbss->priv;
3016         struct sta_info *sta;
3017         bool have_sta = false;
3018         int err;
3019         int ht_cfreq;
3020         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3021         const u8 *ht_oper_ie;
3022         const struct ieee80211_ht_operation *ht_oper = NULL;
3023         struct ieee80211_supported_band *sband;
3024
3025         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3026                 return -EINVAL;
3027
3028         if (assoc) {
3029                 rcu_read_lock();
3030                 have_sta = sta_info_get(sdata, cbss->bssid);
3031                 rcu_read_unlock();
3032         }
3033
3034         if (!have_sta) {
3035                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3036                 if (!sta)
3037                         return -ENOMEM;
3038         }
3039
3040         mutex_lock(&local->mtx);
3041         ieee80211_recalc_idle(sdata->local);
3042         mutex_unlock(&local->mtx);
3043
3044         /* switch to the right channel */
3045         sband = local->hw.wiphy->bands[cbss->channel->band];
3046
3047         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3048
3049         if (sband->ht_cap.ht_supported) {
3050                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3051                                               cbss->information_elements,
3052                                               cbss->len_information_elements);
3053                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3054                         ht_oper = (void *)(ht_oper_ie + 2);
3055         }
3056
3057         if (ht_oper) {
3058                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3059                                                           cbss->channel->band);
3060                 /* check that channel matches the right operating channel */
3061                 if (cbss->channel->center_freq != ht_cfreq) {
3062                         /*
3063                          * It's possible that some APs are confused here;
3064                          * Netgear WNDR3700 sometimes reports 4 higher than
3065                          * the actual channel in association responses, but
3066                          * since we look at probe response/beacon data here
3067                          * it should be OK.
3068                          */
3069                         printk(KERN_DEBUG
3070                                "%s: Wrong control channel: center-freq: %d"
3071                                " ht-cfreq: %d ht->primary_chan: %d"
3072                                " band: %d. Disabling HT.\n",
3073                                sdata->name, cbss->channel->center_freq,
3074                                ht_cfreq, ht_oper->primary_chan,
3075                                cbss->channel->band);
3076                         ht_oper = NULL;
3077                 }
3078         }
3079
3080         if (ht_oper) {
3081                 channel_type = NL80211_CHAN_HT20;
3082
3083                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3084                         switch (ht_oper->ht_param &
3085                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3086                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3087                                 channel_type = NL80211_CHAN_HT40PLUS;
3088                                 break;
3089                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3090                                 channel_type = NL80211_CHAN_HT40MINUS;
3091                                 break;
3092                         }
3093                 }
3094         }
3095
3096         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3097                 /* can only fail due to HT40+/- mismatch */
3098                 channel_type = NL80211_CHAN_HT20;
3099                 printk(KERN_DEBUG
3100                        "%s: disabling 40 MHz due to multi-vif mismatch\n",
3101                        sdata->name);
3102                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3103                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3104                                                     channel_type));
3105         }
3106
3107         local->oper_channel = cbss->channel;
3108         ieee80211_hw_config(local, 0);
3109
3110         if (!have_sta) {
3111                 u32 rates = 0, basic_rates = 0;
3112                 bool have_higher_than_11mbit;
3113                 int min_rate = INT_MAX, min_rate_index = -1;
3114
3115                 ieee80211_get_rates(sband, bss->supp_rates,
3116                                     bss->supp_rates_len,
3117                                     &rates, &basic_rates,
3118                                     &have_higher_than_11mbit,
3119                                     &min_rate, &min_rate_index);
3120
3121                 /*
3122                  * This used to be a workaround for basic rates missing
3123                  * in the association response frame. Now that we no
3124                  * longer use the basic rates from there, it probably
3125                  * doesn't happen any more, but keep the workaround so
3126                  * in case some *other* APs are buggy in different ways
3127                  * we can connect -- with a warning.
3128                  */
3129                 if (!basic_rates && min_rate_index >= 0) {
3130                         printk(KERN_DEBUG
3131                                "%s: No basic rates, using min rate instead.\n",
3132                                sdata->name);
3133                         basic_rates = BIT(min_rate_index);
3134                 }
3135
3136                 sta->sta.supp_rates[cbss->channel->band] = rates;
3137                 sdata->vif.bss_conf.basic_rates = basic_rates;
3138
3139                 /* cf. IEEE 802.11 9.2.12 */
3140                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3141                     have_higher_than_11mbit)
3142                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3143                 else
3144                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3145
3146                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3147
3148                 /* tell driver about BSSID and basic rates */
3149                 ieee80211_bss_info_change_notify(sdata,
3150                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES);
3151
3152                 if (assoc)
3153                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3154
3155                 err = sta_info_insert(sta);
3156                 sta = NULL;
3157                 if (err) {
3158                         printk(KERN_DEBUG
3159                                "%s: failed to insert STA entry for the AP (error %d)\n",
3160                                sdata->name, err);
3161                         return err;
3162                 }
3163         } else
3164                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3165
3166         return 0;
3167 }
3168
3169 /* config hooks */
3170 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3171                        struct cfg80211_auth_request *req)
3172 {
3173         struct ieee80211_local *local = sdata->local;
3174         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3175         struct ieee80211_mgd_auth_data *auth_data;
3176         u16 auth_alg;
3177         int err;
3178
3179         /* prepare auth data structure */
3180
3181         switch (req->auth_type) {
3182         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3183                 auth_alg = WLAN_AUTH_OPEN;
3184                 break;
3185         case NL80211_AUTHTYPE_SHARED_KEY:
3186                 if (IS_ERR(local->wep_tx_tfm))
3187                         return -EOPNOTSUPP;
3188                 auth_alg = WLAN_AUTH_SHARED_KEY;
3189                 break;
3190         case NL80211_AUTHTYPE_FT:
3191                 auth_alg = WLAN_AUTH_FT;
3192                 break;
3193         case NL80211_AUTHTYPE_NETWORK_EAP:
3194                 auth_alg = WLAN_AUTH_LEAP;
3195                 break;
3196         default:
3197                 return -EOPNOTSUPP;
3198         }
3199
3200         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3201         if (!auth_data)
3202                 return -ENOMEM;
3203
3204         auth_data->bss = req->bss;
3205
3206         if (req->ie && req->ie_len) {
3207                 memcpy(auth_data->ie, req->ie, req->ie_len);
3208                 auth_data->ie_len = req->ie_len;
3209         }
3210
3211         if (req->key && req->key_len) {
3212                 auth_data->key_len = req->key_len;
3213                 auth_data->key_idx = req->key_idx;
3214                 memcpy(auth_data->key, req->key, req->key_len);
3215         }
3216
3217         auth_data->algorithm = auth_alg;
3218
3219         /* try to authenticate/probe */
3220
3221         mutex_lock(&ifmgd->mtx);
3222
3223         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3224             ifmgd->assoc_data) {
3225                 err = -EBUSY;
3226                 goto err_free;
3227         }
3228
3229         if (ifmgd->auth_data)
3230                 ieee80211_destroy_auth_data(sdata, false);
3231
3232         /* prep auth_data so we don't go into idle on disassoc */
3233         ifmgd->auth_data = auth_data;
3234
3235         if (ifmgd->associated)
3236                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3237
3238         printk(KERN_DEBUG "%s: authenticate with %pM\n",
3239                sdata->name, req->bss->bssid);
3240
3241         err = ieee80211_prep_connection(sdata, req->bss, false);
3242         if (err)
3243                 goto err_clear;
3244
3245         err = ieee80211_probe_auth(sdata);
3246         if (err) {
3247                 sta_info_destroy_addr(sdata, req->bss->bssid);
3248                 goto err_clear;
3249         }
3250
3251         /* hold our own reference */
3252         cfg80211_ref_bss(auth_data->bss);
3253         err = 0;
3254         goto out_unlock;
3255
3256  err_clear:
3257         ifmgd->auth_data = NULL;
3258  err_free:
3259         kfree(auth_data);
3260  out_unlock:
3261         mutex_unlock(&ifmgd->mtx);
3262
3263         return err;
3264 }
3265
3266 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3267                         struct cfg80211_assoc_request *req)
3268 {
3269         struct ieee80211_local *local = sdata->local;
3270         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3271         struct ieee80211_bss *bss = (void *)req->bss->priv;
3272         struct ieee80211_mgd_assoc_data *assoc_data;
3273         struct ieee80211_supported_band *sband;
3274         const u8 *ssidie;
3275         int i, err;
3276
3277         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3278         if (!ssidie)
3279                 return -EINVAL;
3280
3281         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3282         if (!assoc_data)
3283                 return -ENOMEM;
3284
3285         mutex_lock(&ifmgd->mtx);
3286
3287         if (ifmgd->associated)
3288                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3289
3290         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3291                 err = -EBUSY;
3292                 goto err_free;
3293         }
3294
3295         if (ifmgd->assoc_data) {
3296                 err = -EBUSY;
3297                 goto err_free;
3298         }
3299
3300         if (ifmgd->auth_data) {
3301                 bool match;
3302
3303                 /* keep sta info, bssid if matching */
3304                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3305                 ieee80211_destroy_auth_data(sdata, match);
3306         }
3307
3308         /* prepare assoc data */
3309
3310         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3311         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3312
3313         ifmgd->beacon_crc_valid = false;
3314
3315         /*
3316          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3317          * We still associate in non-HT mode (11a/b/g) if any one of these
3318          * ciphers is configured as pairwise.
3319          * We can set this to true for non-11n hardware, that'll be checked
3320          * separately along with the peer capabilities.
3321          */
3322         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
3323                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3324                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3325                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
3326                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3327
3328         if (req->flags & ASSOC_REQ_DISABLE_HT)
3329                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3330
3331         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3332         sband = local->hw.wiphy->bands[req->bss->channel->band];
3333         if (!sband->ht_cap.ht_supported ||
3334             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used)
3335                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3336
3337         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3338         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3339                sizeof(ifmgd->ht_capa_mask));
3340
3341         if (req->ie && req->ie_len) {
3342                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3343                 assoc_data->ie_len = req->ie_len;
3344         }
3345
3346         assoc_data->bss = req->bss;
3347
3348         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3349                 if (ifmgd->powersave)
3350                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3351                 else
3352                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3353         } else
3354                 ifmgd->ap_smps = ifmgd->req_smps;
3355
3356         assoc_data->capability = req->bss->capability;
3357         assoc_data->wmm = bss->wmm_used &&
3358                           (local->hw.queues >= IEEE80211_NUM_ACS);
3359         assoc_data->supp_rates = bss->supp_rates;
3360         assoc_data->supp_rates_len = bss->supp_rates_len;
3361         assoc_data->ht_operation_ie =
3362                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3363
3364         if (bss->wmm_used && bss->uapsd_supported &&
3365             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3366                 assoc_data->uapsd = true;
3367                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3368         } else {
3369                 assoc_data->uapsd = false;
3370                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3371         }
3372
3373         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3374         assoc_data->ssid_len = ssidie[1];
3375
3376         if (req->prev_bssid)
3377                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3378
3379         if (req->use_mfp) {
3380                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3381                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3382         } else {
3383                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3384                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3385         }
3386
3387         if (req->crypto.control_port)
3388                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3389         else
3390                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3391
3392         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3393         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3394
3395         /* kick off associate process */
3396
3397         ifmgd->assoc_data = assoc_data;
3398
3399         err = ieee80211_prep_connection(sdata, req->bss, true);
3400         if (err)
3401                 goto err_clear;
3402
3403         if (!bss->dtim_period &&
3404             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3405                 /*
3406                  * Wait up to one beacon interval ...
3407                  * should this be more if we miss one?
3408                  */
3409                 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
3410                        sdata->name, ifmgd->bssid);
3411                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3412         } else {
3413                 assoc_data->have_beacon = true;
3414                 assoc_data->sent_assoc = false;
3415                 assoc_data->timeout = jiffies;
3416         }
3417         run_again(ifmgd, assoc_data->timeout);
3418
3419         if (bss->corrupt_data) {
3420                 char *corrupt_type = "data";
3421                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3422                         if (bss->corrupt_data &
3423                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3424                                 corrupt_type = "beacon and probe response";
3425                         else
3426                                 corrupt_type = "beacon";
3427                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3428                         corrupt_type = "probe response";
3429                 printk(KERN_DEBUG "%s: associating with AP with corrupt %s\n",
3430                        sdata->name, corrupt_type);
3431         }
3432
3433         err = 0;
3434         goto out;
3435  err_clear:
3436         ifmgd->assoc_data = NULL;
3437  err_free:
3438         kfree(assoc_data);
3439  out:
3440         mutex_unlock(&ifmgd->mtx);
3441
3442         return err;
3443 }
3444
3445 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3446                          struct cfg80211_deauth_request *req)
3447 {
3448         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3449         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3450
3451         mutex_lock(&ifmgd->mtx);
3452
3453         if (ifmgd->auth_data) {
3454                 ieee80211_destroy_auth_data(sdata, false);
3455                 mutex_unlock(&ifmgd->mtx);
3456                 return 0;
3457         }
3458
3459         printk(KERN_DEBUG
3460                "%s: deauthenticating from %pM by local choice (reason=%d)\n",
3461                sdata->name, req->bssid, req->reason_code);
3462
3463         if (ifmgd->associated &&
3464             ether_addr_equal(ifmgd->associated->bssid, req->bssid))
3465                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3466                                        req->reason_code, true, frame_buf);
3467         else
3468                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3469                                                IEEE80211_STYPE_DEAUTH,
3470                                                req->reason_code, true,
3471                                                frame_buf);
3472         mutex_unlock(&ifmgd->mtx);
3473
3474         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3475
3476         mutex_lock(&sdata->local->mtx);
3477         ieee80211_recalc_idle(sdata->local);
3478         mutex_unlock(&sdata->local->mtx);
3479
3480         return 0;
3481 }
3482
3483 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3484                            struct cfg80211_disassoc_request *req)
3485 {
3486         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3487         u8 bssid[ETH_ALEN];
3488         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3489
3490         mutex_lock(&ifmgd->mtx);
3491
3492         /*
3493          * cfg80211 should catch this ... but it's racy since
3494          * we can receive a disassoc frame, process it, hand it
3495          * to cfg80211 while that's in a locked section already
3496          * trying to tell us that the user wants to disconnect.
3497          */
3498         if (ifmgd->associated != req->bss) {
3499                 mutex_unlock(&ifmgd->mtx);
3500                 return -ENOLINK;
3501         }
3502
3503         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
3504                sdata->name, req->bss->bssid, req->reason_code);
3505
3506         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3507         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3508                                req->reason_code, !req->local_state_change,
3509                                frame_buf);
3510         mutex_unlock(&ifmgd->mtx);
3511
3512         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3513
3514         mutex_lock(&sdata->local->mtx);
3515         ieee80211_recalc_idle(sdata->local);
3516         mutex_unlock(&sdata->local->mtx);
3517
3518         return 0;
3519 }
3520
3521 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3522 {
3523         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3524
3525         mutex_lock(&ifmgd->mtx);
3526         if (ifmgd->assoc_data)
3527                 ieee80211_destroy_assoc_data(sdata, false);
3528         if (ifmgd->auth_data)
3529                 ieee80211_destroy_auth_data(sdata, false);
3530         del_timer_sync(&ifmgd->timer);
3531         mutex_unlock(&ifmgd->mtx);
3532 }
3533
3534 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3535                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3536                                gfp_t gfp)
3537 {
3538         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3539
3540         trace_api_cqm_rssi_notify(sdata, rssi_event);
3541
3542         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3543 }
3544 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
3545
3546 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
3547 {
3548         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3549         return sdata->dev->operstate;
3550 }
3551 EXPORT_SYMBOL(ieee80211_get_operstate);