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/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <net/mac80211.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  31 #define IEEE80211_AUTH_MAX_TRIES 3
  32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  33 #define IEEE80211_ASSOC_MAX_TRIES 3
  34
  35 /*
  36  * beacon loss detection timeout
  37  * XXX: should depend on beacon interval
  38  */
  39 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  40 /*
  41  * Time the connection can be idle before we probe
  42  * it to see if we can still talk to the AP.
  43  */
  44 #define IEEE80211_CONNECTION_IDLE_TIME  (2 * HZ)
  45 /*
  46  * Time we wait for a probe response after sending
  47  * a probe request because of beacon loss or for
  48  * checking the connection still works.
  49  */
  50 #define IEEE80211_PROBE_WAIT            (HZ / 5)
  51
  52 #define TMR_RUNNING_TIMER       0
  53 #define TMR_RUNNING_CHANSW      1
  54
  55 /*
  56  * All cfg80211 functions have to be called outside a locked
  57  * section so that they can acquire a lock themselves... This
  58  * is much simpler than queuing up things in cfg80211, but we
  59  * do need some indirection for that here.
  60  */
  61 enum rx_mgmt_action {
  62         /* no action required */
  63         RX_MGMT_NONE,
  64
  65         /* caller must call cfg80211_send_rx_auth() */
  66         RX_MGMT_CFG80211_AUTH,
  67
  68         /* caller must call cfg80211_send_rx_assoc() */
  69         RX_MGMT_CFG80211_ASSOC,
  70
  71         /* caller must call cfg80211_send_deauth() */
  72         RX_MGMT_CFG80211_DEAUTH,
  73
  74         /* caller must call cfg80211_send_disassoc() */
  75         RX_MGMT_CFG80211_DISASSOC,
  76
  77         /* caller must call cfg80211_auth_timeout() & free work */
  78         RX_MGMT_CFG80211_AUTH_TO,
  79
  80         /* caller must call cfg80211_assoc_timeout() & free work */
  81         RX_MGMT_CFG80211_ASSOC_TO,
  82 };
  83
  84 /* utils */
  85 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  86 {
  87         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  88 }
  89
  90 /*
  91  * We can have multiple work items (and connection probing)
  92  * scheduling this timer, but we need to take care to only
  93  * reschedule it when it should fire _earlier_ than it was
  94  * asked for before, or if it's not pending right now. This
  95  * function ensures that. Note that it then is required to
  96  * run this function for all timeouts after the first one
  97  * has happened -- the work that runs from this timer will
  98  * do that.
  99  */
 100 static void run_again(struct ieee80211_if_managed *ifmgd,
 101                              unsigned long timeout)
 102 {
 103         ASSERT_MGD_MTX(ifmgd);
 104
 105         if (!timer_pending(&ifmgd->timer) ||
 106             time_before(timeout, ifmgd->timer.expires))
 107                 mod_timer(&ifmgd->timer, timeout);
 108 }
 109
 110 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 111 {
 112         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 113                 return;
 114
 115         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 116                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 117 }
 118
 119 static int ecw2cw(int ecw)
 120 {
 121         return (1 << ecw) - 1;
 122 }
 123
 124 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
 125                                       struct ieee80211_supported_band *sband,
 126                                       u32 *rates)
 127 {
 128         int i, j, count;
 129         *rates = 0;
 130         count = 0;
 131         for (i = 0; i < bss->supp_rates_len; i++) {
 132                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
 133
 134                 for (j = 0; j < sband->n_bitrates; j++)
 135                         if (sband->bitrates[j].bitrate == rate) {
 136                                 *rates |= BIT(j);
 137                                 count++;
 138                                 break;
 139                         }
 140         }
 141
 142         return count;
 143 }
 144
 145 /*
 146  * ieee80211_enable_ht should be called only after the operating band
 147  * has been determined as ht configuration depends on the hw's
 148  * HT abilities for a specific band.
 149  */
 150 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 151                                struct ieee80211_ht_info *hti,
 152                                const u8 *bssid, u16 ap_ht_cap_flags)
 153 {
 154         struct ieee80211_local *local = sdata->local;
 155         struct ieee80211_supported_band *sband;
 156         struct sta_info *sta;
 157         u32 changed = 0;
 158         u16 ht_opmode;
 159         bool enable_ht = true, ht_changed;
 160         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 161
 162         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 163
 164         /* HT is not supported */
 165         if (!sband->ht_cap.ht_supported)
 166                 enable_ht = false;
 167
 168         /* check that channel matches the right operating channel */
 169         if (local->hw.conf.channel->center_freq !=
 170             ieee80211_channel_to_frequency(hti->control_chan))
 171                 enable_ht = false;
 172
 173         if (enable_ht) {
 174                 channel_type = NL80211_CHAN_HT20;
 175
 176                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 177                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 178                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 179                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 180                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 181                                 if (!(local->hw.conf.channel->flags &
 182                                     IEEE80211_CHAN_NO_HT40PLUS))
 183                                         channel_type = NL80211_CHAN_HT40PLUS;
 184                                 break;
 185                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 186                                 if (!(local->hw.conf.channel->flags &
 187                                     IEEE80211_CHAN_NO_HT40MINUS))
 188                                         channel_type = NL80211_CHAN_HT40MINUS;
 189                                 break;
 190                         }
 191                 }
 192         }
 193
 194         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 195                      channel_type != local->hw.conf.channel_type;
 196
 197         local->oper_channel_type = channel_type;
 198
 199         if (ht_changed) {
 200                 /* channel_type change automatically detected */
 201                 ieee80211_hw_config(local, 0);
 202
 203                 rcu_read_lock();
 204                 sta = sta_info_get(local, bssid);
 205                 if (sta)
 206                         rate_control_rate_update(local, sband, sta,
 207                                                  IEEE80211_RC_HT_CHANGED);
 208                 rcu_read_unlock();
 209         }
 210
 211         /* disable HT */
 212         if (!enable_ht)
 213                 return 0;
 214
 215         ht_opmode = le16_to_cpu(hti->operation_mode);
 216
 217         /* if bss configuration changed store the new one */
 218         if (!sdata->ht_opmode_valid ||
 219             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 220                 changed |= BSS_CHANGED_HT;
 221                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 222                 sdata->ht_opmode_valid = true;
 223         }
 224
 225         return changed;
 226 }
 227
 228 /* frame sending functions */
 229
 230 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 231                                  struct ieee80211_mgd_work *wk)
 232 {
 233         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 234         struct ieee80211_local *local = sdata->local;
 235         struct sk_buff *skb;
 236         struct ieee80211_mgmt *mgmt;
 237         u8 *pos;
 238         const u8 *ies, *ht_ie;
 239         int i, len, count, rates_len, supp_rates_len;
 240         u16 capab;
 241         int wmm = 0;
 242         struct ieee80211_supported_band *sband;
 243         u32 rates = 0;
 244
 245         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 246                             sizeof(*mgmt) + 200 + wk->ie_len +
 247                             wk->ssid_len);
 248         if (!skb) {
 249                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 250                        "frame\n", sdata->dev->name);
 251                 return;
 252         }
 253         skb_reserve(skb, local->hw.extra_tx_headroom);
 254
 255         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 256
 257         capab = ifmgd->capab;
 258
 259         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 260                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 261                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 262                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 263                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 264         }
 265
 266         if (wk->bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 267                 capab |= WLAN_CAPABILITY_PRIVACY;
 268         if (wk->bss->wmm_used)
 269                 wmm = 1;
 270
 271         /* get all rates supported by the device and the AP as
 272          * some APs don't like getting a superset of their rates
 273          * in the association request (e.g. D-Link DAP 1353 in
 274          * b-only mode) */
 275         rates_len = ieee80211_compatible_rates(wk->bss, sband, &rates);
 276
 277         if ((wk->bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 278             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 279                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 280
 281         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 282         memset(mgmt, 0, 24);
 283         memcpy(mgmt->da, wk->bss->cbss.bssid, ETH_ALEN);
 284         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 285         memcpy(mgmt->bssid, wk->bss->cbss.bssid, ETH_ALEN);
 286
 287         if (!is_zero_ether_addr(wk->prev_bssid)) {
 288                 skb_put(skb, 10);
 289                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 290                                                   IEEE80211_STYPE_REASSOC_REQ);
 291                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 292                 mgmt->u.reassoc_req.listen_interval =
 293                                 cpu_to_le16(local->hw.conf.listen_interval);
 294                 memcpy(mgmt->u.reassoc_req.current_ap, wk->prev_bssid,
 295                        ETH_ALEN);
 296         } else {
 297                 skb_put(skb, 4);
 298                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 299                                                   IEEE80211_STYPE_ASSOC_REQ);
 300                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 301                 mgmt->u.assoc_req.listen_interval =
 302                                 cpu_to_le16(local->hw.conf.listen_interval);
 303         }
 304
 305         /* SSID */
 306         ies = pos = skb_put(skb, 2 + wk->ssid_len);
 307         *pos++ = WLAN_EID_SSID;
 308         *pos++ = wk->ssid_len;
 309         memcpy(pos, wk->ssid, wk->ssid_len);
 310
 311         /* add all rates which were marked to be used above */
 312         supp_rates_len = rates_len;
 313         if (supp_rates_len > 8)
 314                 supp_rates_len = 8;
 315
 316         len = sband->n_bitrates;
 317         pos = skb_put(skb, supp_rates_len + 2);
 318         *pos++ = WLAN_EID_SUPP_RATES;
 319         *pos++ = supp_rates_len;
 320
 321         count = 0;
 322         for (i = 0; i < sband->n_bitrates; i++) {
 323                 if (BIT(i) & rates) {
 324                         int rate = sband->bitrates[i].bitrate;
 325                         *pos++ = (u8) (rate / 5);
 326                         if (++count == 8)
 327                                 break;
 328                 }
 329         }
 330
 331         if (rates_len > count) {
 332                 pos = skb_put(skb, rates_len - count + 2);
 333                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 334                 *pos++ = rates_len - count;
 335
 336                 for (i++; i < sband->n_bitrates; i++) {
 337                         if (BIT(i) & rates) {
 338                                 int rate = sband->bitrates[i].bitrate;
 339                                 *pos++ = (u8) (rate / 5);
 340                         }
 341                 }
 342         }
 343
 344         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 345                 /* 1. power capabilities */
 346                 pos = skb_put(skb, 4);
 347                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 348                 *pos++ = 2;
 349                 *pos++ = 0; /* min tx power */
 350                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 351
 352                 /* 2. supported channels */
 353                 /* TODO: get this in reg domain format */
 354                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 355                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 356                 *pos++ = 2 * sband->n_channels;
 357                 for (i = 0; i < sband->n_channels; i++) {
 358                         *pos++ = ieee80211_frequency_to_channel(
 359                                         sband->channels[i].center_freq);
 360                         *pos++ = 1; /* one channel in the subband*/
 361                 }
 362         }
 363
 364         if (wk->ie_len && wk->ie) {
 365                 pos = skb_put(skb, wk->ie_len);
 366                 memcpy(pos, wk->ie, wk->ie_len);
 367         }
 368
 369         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 370                 pos = skb_put(skb, 9);
 371                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 372                 *pos++ = 7; /* len */
 373                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 374                 *pos++ = 0x50;
 375                 *pos++ = 0xf2;
 376                 *pos++ = 2; /* WME */
 377                 *pos++ = 0; /* WME info */
 378                 *pos++ = 1; /* WME ver */
 379                 *pos++ = 0;
 380         }
 381
 382         /* wmm support is a must to HT */
 383         /*
 384          * IEEE802.11n does not allow TKIP/WEP as pairwise
 385          * ciphers in HT mode. We still associate in non-ht
 386          * mode (11a/b/g) if any one of these ciphers is
 387          * configured as pairwise.
 388          */
 389         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 390             sband->ht_cap.ht_supported &&
 391             (ht_ie = ieee80211_bss_get_ie(&wk->bss->cbss, WLAN_EID_HT_INFORMATION)) &&
 392             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 393             (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
 394                 struct ieee80211_ht_info *ht_info =
 395                         (struct ieee80211_ht_info *)(ht_ie + 2);
 396                 u16 cap = sband->ht_cap.cap;
 397                 __le16 tmp;
 398                 u32 flags = local->hw.conf.channel->flags;
 399
 400                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 401                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 402                         if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 403                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 404                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 405                         }
 406                         break;
 407                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 408                         if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 409                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 410                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 411                         }
 412                         break;
 413                 }
 414
 415                 tmp = cpu_to_le16(cap);
 416                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 417                 *pos++ = WLAN_EID_HT_CAPABILITY;
 418                 *pos++ = sizeof(struct ieee80211_ht_cap);
 419                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 420                 memcpy(pos, &tmp, sizeof(u16));
 421                 pos += sizeof(u16);
 422                 /* TODO: needs a define here for << 2 */
 423                 *pos++ = sband->ht_cap.ampdu_factor |
 424                          (sband->ht_cap.ampdu_density << 2);
 425                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 426         }
 427
 428         ieee80211_tx_skb(sdata, skb, 0);
 429 }
 430
 431
 432 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 433                                            const u8 *bssid, u16 stype, u16 reason,
 434                                            void *cookie)
 435 {
 436         struct ieee80211_local *local = sdata->local;
 437         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 438         struct sk_buff *skb;
 439         struct ieee80211_mgmt *mgmt;
 440
 441         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 442         if (!skb) {
 443                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 444                        "deauth/disassoc frame\n", sdata->dev->name);
 445                 return;
 446         }
 447         skb_reserve(skb, local->hw.extra_tx_headroom);
 448
 449         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 450         memset(mgmt, 0, 24);
 451         memcpy(mgmt->da, bssid, ETH_ALEN);
 452         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 453         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 454         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 455         skb_put(skb, 2);
 456         /* u.deauth.reason_code == u.disassoc.reason_code */
 457         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 458
 459         if (stype == IEEE80211_STYPE_DEAUTH)
 460                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len, cookie);
 461         else
 462                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len, cookie);
 463         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 464 }
 465
 466 void ieee80211_send_pspoll(struct ieee80211_local *local,
 467                            struct ieee80211_sub_if_data *sdata)
 468 {
 469         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 470         struct ieee80211_pspoll *pspoll;
 471         struct sk_buff *skb;
 472         u16 fc;
 473
 474         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 475         if (!skb) {
 476                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 477                        "pspoll frame\n", sdata->dev->name);
 478                 return;
 479         }
 480         skb_reserve(skb, local->hw.extra_tx_headroom);
 481
 482         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 483         memset(pspoll, 0, sizeof(*pspoll));
 484         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 485         pspoll->frame_control = cpu_to_le16(fc);
 486         pspoll->aid = cpu_to_le16(ifmgd->aid);
 487
 488         /* aid in PS-Poll has its two MSBs each set to 1 */
 489         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 490
 491         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 492         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 493
 494         ieee80211_tx_skb(sdata, skb, 0);
 495 }
 496
 497 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 498                              struct ieee80211_sub_if_data *sdata,
 499                              int powersave)
 500 {
 501         struct sk_buff *skb;
 502         struct ieee80211_hdr *nullfunc;
 503         __le16 fc;
 504
 505         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 506                 return;
 507
 508         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 509         if (!skb) {
 510                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 511                        "frame\n", sdata->dev->name);
 512                 return;
 513         }
 514         skb_reserve(skb, local->hw.extra_tx_headroom);
 515
 516         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 517         memset(nullfunc, 0, 24);
 518         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 519                          IEEE80211_FCTL_TODS);
 520         if (powersave)
 521                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 522         nullfunc->frame_control = fc;
 523         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 524         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 525         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 526
 527         ieee80211_tx_skb(sdata, skb, 0);
 528 }
 529
 530 /* spectrum management related things */
 531 static void ieee80211_chswitch_work(struct work_struct *work)
 532 {
 533         struct ieee80211_sub_if_data *sdata =
 534                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 535         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 536
 537         if (!netif_running(sdata->dev))
 538                 return;
 539
 540         mutex_lock(&ifmgd->mtx);
 541         if (!ifmgd->associated)
 542                 goto out;
 543
 544         sdata->local->oper_channel = sdata->local->csa_channel;
 545         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 546
 547         /* XXX: shouldn't really modify cfg80211-owned data! */
 548         ifmgd->associated->cbss.channel = sdata->local->oper_channel;
 549
 550         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 551                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 552  out:
 553         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 554         mutex_unlock(&ifmgd->mtx);
 555 }
 556
 557 static void ieee80211_chswitch_timer(unsigned long data)
 558 {
 559         struct ieee80211_sub_if_data *sdata =
 560                 (struct ieee80211_sub_if_data *) data;
 561         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 562
 563         if (sdata->local->quiescing) {
 564                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 565                 return;
 566         }
 567
 568         queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
 569 }
 570
 571 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 572                                       struct ieee80211_channel_sw_ie *sw_elem,
 573                                       struct ieee80211_bss *bss)
 574 {
 575         struct ieee80211_channel *new_ch;
 576         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 577         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 578
 579         ASSERT_MGD_MTX(ifmgd);
 580
 581         if (!ifmgd->associated)
 582                 return;
 583
 584         if (sdata->local->sw_scanning || sdata->local->hw_scanning)
 585                 return;
 586
 587         /* Disregard subsequent beacons if we are already running a timer
 588            processing a CSA */
 589
 590         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 591                 return;
 592
 593         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 594         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 595                 return;
 596
 597         sdata->local->csa_channel = new_ch;
 598
 599         if (sw_elem->count <= 1) {
 600                 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
 601         } else {
 602                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 603                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 604                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 605                 mod_timer(&ifmgd->chswitch_timer,
 606                           jiffies +
 607                           msecs_to_jiffies(sw_elem->count *
 608                                            bss->cbss.beacon_interval));
 609         }
 610 }
 611
 612 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 613                                         u16 capab_info, u8 *pwr_constr_elem,
 614                                         u8 pwr_constr_elem_len)
 615 {
 616         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 617
 618         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 619                 return;
 620
 621         /* Power constraint IE length should be 1 octet */
 622         if (pwr_constr_elem_len != 1)
 623                 return;
 624
 625         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 626             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 627                 sdata->local->power_constr_level = *pwr_constr_elem;
 628                 ieee80211_hw_config(sdata->local, 0);
 629         }
 630 }
 631
 632 /* powersave */
 633 static void ieee80211_enable_ps(struct ieee80211_local *local,
 634                                 struct ieee80211_sub_if_data *sdata)
 635 {
 636         struct ieee80211_conf *conf = &local->hw.conf;
 637
 638         /*
 639          * If we are scanning right now then the parameters will
 640          * take effect when scan finishes.
 641          */
 642         if (local->hw_scanning || local->sw_scanning)
 643                 return;
 644
 645         if (conf->dynamic_ps_timeout > 0 &&
 646             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 647                 mod_timer(&local->dynamic_ps_timer, jiffies +
 648                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 649         } else {
 650                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 651                         ieee80211_send_nullfunc(local, sdata, 1);
 652                 conf->flags |= IEEE80211_CONF_PS;
 653                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 654         }
 655 }
 656
 657 static void ieee80211_change_ps(struct ieee80211_local *local)
 658 {
 659         struct ieee80211_conf *conf = &local->hw.conf;
 660
 661         if (local->ps_sdata) {
 662                 ieee80211_enable_ps(local, local->ps_sdata);
 663         } else if (conf->flags & IEEE80211_CONF_PS) {
 664                 conf->flags &= ~IEEE80211_CONF_PS;
 665                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 666                 del_timer_sync(&local->dynamic_ps_timer);
 667                 cancel_work_sync(&local->dynamic_ps_enable_work);
 668         }
 669 }
 670
 671 /* need to hold RTNL or interface lock */
 672 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 673 {
 674         struct ieee80211_sub_if_data *sdata, *found = NULL;
 675         int count = 0;
 676
 677         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 678                 local->ps_sdata = NULL;
 679                 return;
 680         }
 681
 682         list_for_each_entry(sdata, &local->interfaces, list) {
 683                 if (!netif_running(sdata->dev))
 684                         continue;
 685                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 686                         continue;
 687                 found = sdata;
 688                 count++;
 689         }
 690
 691         if (count == 1 && found->u.mgd.powersave &&
 692             found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
 693             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 694                                     IEEE80211_STA_CONNECTION_POLL))) {
 695                 s32 beaconint_us;
 696
 697                 if (latency < 0)
 698                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 699
 700                 beaconint_us = ieee80211_tu_to_usec(
 701                                         found->vif.bss_conf.beacon_int);
 702
 703                 if (beaconint_us > latency) {
 704                         local->ps_sdata = NULL;
 705                 } else {
 706                         u8 dtimper = found->vif.bss_conf.dtim_period;
 707                         int maxslp = 1;
 708
 709                         if (dtimper > 1)
 710                                 maxslp = min_t(int, dtimper,
 711                                                     latency / beaconint_us);
 712
 713                         local->hw.conf.max_sleep_period = maxslp;
 714                         local->ps_sdata = found;
 715                 }
 716         } else {
 717                 local->ps_sdata = NULL;
 718         }
 719
 720         ieee80211_change_ps(local);
 721 }
 722
 723 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 724 {
 725         struct ieee80211_local *local =
 726                 container_of(work, struct ieee80211_local,
 727                              dynamic_ps_disable_work);
 728
 729         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 730                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 731                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 732         }
 733
 734         ieee80211_wake_queues_by_reason(&local->hw,
 735                                         IEEE80211_QUEUE_STOP_REASON_PS);
 736 }
 737
 738 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 739 {
 740         struct ieee80211_local *local =
 741                 container_of(work, struct ieee80211_local,
 742                              dynamic_ps_enable_work);
 743         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 744
 745         /* can only happen when PS was just disabled anyway */
 746         if (!sdata)
 747                 return;
 748
 749         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 750                 return;
 751
 752         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 753                 ieee80211_send_nullfunc(local, sdata, 1);
 754
 755         local->hw.conf.flags |= IEEE80211_CONF_PS;
 756         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 757 }
 758
 759 void ieee80211_dynamic_ps_timer(unsigned long data)
 760 {
 761         struct ieee80211_local *local = (void *) data;
 762
 763         if (local->quiescing)
 764                 return;
 765
 766         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
 767 }
 768
 769 /* MLME */
 770 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 771                                      struct ieee80211_if_managed *ifmgd,
 772                                      u8 *wmm_param, size_t wmm_param_len)
 773 {
 774         struct ieee80211_tx_queue_params params;
 775         size_t left;
 776         int count;
 777         u8 *pos;
 778
 779         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 780                 return;
 781
 782         if (!wmm_param)
 783                 return;
 784
 785         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 786                 return;
 787         count = wmm_param[6] & 0x0f;
 788         if (count == ifmgd->wmm_last_param_set)
 789                 return;
 790         ifmgd->wmm_last_param_set = count;
 791
 792         pos = wmm_param + 8;
 793         left = wmm_param_len - 8;
 794
 795         memset(&params, 0, sizeof(params));
 796
 797         local->wmm_acm = 0;
 798         for (; left >= 4; left -= 4, pos += 4) {
 799                 int aci = (pos[0] >> 5) & 0x03;
 800                 int acm = (pos[0] >> 4) & 0x01;
 801                 int queue;
 802
 803                 switch (aci) {
 804                 case 1: /* AC_BK */
 805                         queue = 3;
 806                         if (acm)
 807                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 808                         break;
 809                 case 2: /* AC_VI */
 810                         queue = 1;
 811                         if (acm)
 812                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 813                         break;
 814                 case 3: /* AC_VO */
 815                         queue = 0;
 816                         if (acm)
 817                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 818                         break;
 819                 case 0: /* AC_BE */
 820                 default:
 821                         queue = 2;
 822                         if (acm)
 823                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 824                         break;
 825                 }
 826
 827                 params.aifs = pos[0] & 0x0f;
 828                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 829                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 830                 params.txop = get_unaligned_le16(pos + 2);
 831 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 832                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 833                        "cWmin=%d cWmax=%d txop=%d\n",
 834                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 835                        params.aifs, params.cw_min, params.cw_max, params.txop);
 836 #endif
 837                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 838                         printk(KERN_DEBUG "%s: failed to set TX queue "
 839                                "parameters for queue %d\n",
 840                                wiphy_name(local->hw.wiphy), queue);
 841         }
 842 }
 843
 844 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 845                                            u16 capab, bool erp_valid, u8 erp)
 846 {
 847         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 848         u32 changed = 0;
 849         bool use_protection;
 850         bool use_short_preamble;
 851         bool use_short_slot;
 852
 853         if (erp_valid) {
 854                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 855                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 856         } else {
 857                 use_protection = false;
 858                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 859         }
 860
 861         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 862
 863         if (use_protection != bss_conf->use_cts_prot) {
 864                 bss_conf->use_cts_prot = use_protection;
 865                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 866         }
 867
 868         if (use_short_preamble != bss_conf->use_short_preamble) {
 869                 bss_conf->use_short_preamble = use_short_preamble;
 870                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 871         }
 872
 873         if (use_short_slot != bss_conf->use_short_slot) {
 874                 bss_conf->use_short_slot = use_short_slot;
 875                 changed |= BSS_CHANGED_ERP_SLOT;
 876         }
 877
 878         return changed;
 879 }
 880
 881 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 882                                      struct ieee80211_bss *bss,
 883                                      u32 bss_info_changed)
 884 {
 885         struct ieee80211_local *local = sdata->local;
 886
 887         bss_info_changed |= BSS_CHANGED_ASSOC;
 888         /* set timing information */
 889         sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 890         sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 891         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 892
 893         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 894         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 895                 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 896
 897         sdata->u.mgd.associated = bss;
 898         memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
 899
 900         /* just to be sure */
 901         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 902                                 IEEE80211_STA_BEACON_POLL);
 903
 904         ieee80211_led_assoc(local, 1);
 905
 906         sdata->vif.bss_conf.assoc = 1;
 907         /*
 908          * For now just always ask the driver to update the basic rateset
 909          * when we have associated, we aren't checking whether it actually
 910          * changed or not.
 911          */
 912         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 913
 914         /* And the BSSID changed - we're associated now */
 915         bss_info_changed |= BSS_CHANGED_BSSID;
 916
 917         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 918
 919         /* will be same as sdata */
 920         if (local->ps_sdata) {
 921                 mutex_lock(&local->iflist_mtx);
 922                 ieee80211_recalc_ps(local, -1);
 923                 mutex_unlock(&local->iflist_mtx);
 924         }
 925
 926         netif_tx_start_all_queues(sdata->dev);
 927         netif_carrier_on(sdata->dev);
 928 }
 929
 930 static enum rx_mgmt_action __must_check
 931 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 932                        struct ieee80211_mgd_work *wk)
 933 {
 934         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 935         struct ieee80211_local *local = sdata->local;
 936
 937         wk->tries++;
 938         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 939                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 940                        sdata->dev->name, wk->bss->cbss.bssid);
 941
 942                 /*
 943                  * Most likely AP is not in the range so remove the
 944                  * bss struct for that AP.
 945                  */
 946                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
 947
 948                 /*
 949                  * We might have a pending scan which had no chance to run yet
 950                  * due to work needing to be done. Hence, queue the STAs work
 951                  * again for that.
 952                  */
 953                 queue_work(local->hw.workqueue, &ifmgd->work);
 954                 return RX_MGMT_CFG80211_AUTH_TO;
 955         }
 956
 957         printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
 958                         sdata->dev->name, wk->bss->cbss.bssid,
 959                         wk->tries);
 960
 961         /*
 962          * Direct probe is sent to broadcast address as some APs
 963          * will not answer to direct packet in unassociated state.
 964          */
 965         ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
 966
 967         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 968         run_again(ifmgd, wk->timeout);
 969
 970         return RX_MGMT_NONE;
 971 }
 972
 973
 974 static enum rx_mgmt_action __must_check
 975 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 976                        struct ieee80211_mgd_work *wk)
 977 {
 978         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 979         struct ieee80211_local *local = sdata->local;
 980
 981         wk->tries++;
 982         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 983                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 984                        " timed out\n",
 985                        sdata->dev->name, wk->bss->cbss.bssid);
 986
 987                 /*
 988                  * Most likely AP is not in the range so remove the
 989                  * bss struct for that AP.
 990                  */
 991                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
 992
 993                 /*
 994                  * We might have a pending scan which had no chance to run yet
 995                  * due to work needing to be done. Hence, queue the STAs work
 996                  * again for that.
 997                  */
 998                 queue_work(local->hw.workqueue, &ifmgd->work);
 999                 return RX_MGMT_CFG80211_AUTH_TO;
1000         }
1001
1002         printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
1003                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1004
1005         ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
1006                             wk->bss->cbss.bssid, NULL, 0, 0);
1007         wk->auth_transaction = 2;
1008
1009         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1010         run_again(ifmgd, wk->timeout);
1011
1012         return RX_MGMT_NONE;
1013 }
1014
1015 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
1016 {
1017         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1018         struct ieee80211_local *local = sdata->local;
1019         struct sta_info *sta;
1020         u32 changed = 0, config_changed = 0;
1021         u8 bssid[ETH_ALEN];
1022
1023         ASSERT_MGD_MTX(ifmgd);
1024
1025         if (WARN_ON(!ifmgd->associated))
1026                 return;
1027
1028         memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
1029
1030         ifmgd->associated = NULL;
1031         memset(ifmgd->bssid, 0, ETH_ALEN);
1032
1033         /*
1034          * we need to commit the associated = NULL change because the
1035          * scan code uses that to determine whether this iface should
1036          * go to/wake up from powersave or not -- and could otherwise
1037          * wake the queues erroneously.
1038          */
1039         smp_mb();
1040
1041         /*
1042          * Thus, we can only afterwards stop the queues -- to account
1043          * for the case where another CPU is finishing a scan at this
1044          * time -- we don't want the scan code to enable queues.
1045          */
1046
1047         netif_tx_stop_all_queues(sdata->dev);
1048         netif_carrier_off(sdata->dev);
1049
1050         rcu_read_lock();
1051         sta = sta_info_get(local, bssid);
1052         if (sta)
1053                 ieee80211_sta_tear_down_BA_sessions(sta);
1054         rcu_read_unlock();
1055
1056         changed |= ieee80211_reset_erp_info(sdata);
1057
1058         ieee80211_led_assoc(local, 0);
1059         changed |= BSS_CHANGED_ASSOC;
1060         sdata->vif.bss_conf.assoc = false;
1061
1062         ieee80211_set_wmm_default(sdata);
1063
1064         ieee80211_recalc_idle(local);
1065
1066         /* channel(_type) changes are handled by ieee80211_hw_config */
1067         local->oper_channel_type = NL80211_CHAN_NO_HT;
1068
1069         /* on the next assoc, re-program HT parameters */
1070         sdata->ht_opmode_valid = false;
1071
1072         local->power_constr_level = 0;
1073
1074         del_timer_sync(&local->dynamic_ps_timer);
1075         cancel_work_sync(&local->dynamic_ps_enable_work);
1076
1077         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1078                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1079                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1080         }
1081
1082         ieee80211_hw_config(local, config_changed);
1083
1084         /* And the BSSID changed -- not very interesting here */
1085         changed |= BSS_CHANGED_BSSID;
1086         ieee80211_bss_info_change_notify(sdata, changed);
1087
1088         rcu_read_lock();
1089
1090         sta = sta_info_get(local, bssid);
1091         if (!sta) {
1092                 rcu_read_unlock();
1093                 return;
1094         }
1095
1096         sta_info_unlink(&sta);
1097
1098         rcu_read_unlock();
1099
1100         sta_info_destroy(sta);
1101 }
1102
1103 static enum rx_mgmt_action __must_check
1104 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1105                     struct ieee80211_mgd_work *wk)
1106 {
1107         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1108         struct ieee80211_local *local = sdata->local;
1109
1110         wk->tries++;
1111         if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1112                 printk(KERN_DEBUG "%s: association with AP %pM"
1113                        " timed out\n",
1114                        sdata->dev->name, wk->bss->cbss.bssid);
1115
1116                 /*
1117                  * Most likely AP is not in the range so remove the
1118                  * bss struct for that AP.
1119                  */
1120                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1121
1122                 /*
1123                  * We might have a pending scan which had no chance to run yet
1124                  * due to work needing to be done. Hence, queue the STAs work
1125                  * again for that.
1126                  */
1127                 queue_work(local->hw.workqueue, &ifmgd->work);
1128                 return RX_MGMT_CFG80211_ASSOC_TO;
1129         }
1130
1131         printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1132                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1133         ieee80211_send_assoc(sdata, wk);
1134
1135         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1136         run_again(ifmgd, wk->timeout);
1137
1138         return RX_MGMT_NONE;
1139 }
1140
1141 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1142                              struct ieee80211_hdr *hdr)
1143 {
1144         /*
1145          * We can postpone the mgd.timer whenever receiving unicast frames
1146          * from AP because we know that the connection is working both ways
1147          * at that time. But multicast frames (and hence also beacons) must
1148          * be ignored here, because we need to trigger the timer during
1149          * data idle periods for sending the periodic probe request to the
1150          * AP we're connected to.
1151          */
1152         if (is_multicast_ether_addr(hdr->addr1))
1153                 return;
1154
1155         mod_timer(&sdata->u.mgd.conn_mon_timer,
1156                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1157 }
1158
1159 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1160                                    bool beacon)
1161 {
1162         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1163         const u8 *ssid;
1164         bool already = false;
1165
1166         if (!netif_running(sdata->dev))
1167                 return;
1168
1169         mutex_lock(&ifmgd->mtx);
1170
1171         if (!ifmgd->associated)
1172                 goto out;
1173
1174 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1175         if (beacon && net_ratelimit())
1176                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1177                        "- sending probe request\n", sdata->dev->name);
1178 #endif
1179
1180         /*
1181          * The driver/our work has already reported this event or the
1182          * connection monitoring has kicked in and we have already sent
1183          * a probe request. Or maybe the AP died and the driver keeps
1184          * reporting until we disassociate...
1185          *
1186          * In either case we have to ignore the current call to this
1187          * function (except for setting the correct probe reason bit)
1188          * because otherwise we would reset the timer every time and
1189          * never check whether we received a probe response!
1190          */
1191         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1192                             IEEE80211_STA_CONNECTION_POLL))
1193                 already = true;
1194
1195         if (beacon)
1196                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1197         else
1198                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1199
1200         if (already)
1201                 goto out;
1202
1203         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1204
1205         mutex_lock(&sdata->local->iflist_mtx);
1206         ieee80211_recalc_ps(sdata->local, -1);
1207         mutex_unlock(&sdata->local->iflist_mtx);
1208
1209         ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1210         ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1211                                  ssid + 2, ssid[1], NULL, 0);
1212
1213         run_again(ifmgd, ifmgd->probe_timeout);
1214
1215  out:
1216         mutex_unlock(&ifmgd->mtx);
1217 }
1218
1219 void ieee80211_beacon_loss_work(struct work_struct *work)
1220 {
1221         struct ieee80211_sub_if_data *sdata =
1222                 container_of(work, struct ieee80211_sub_if_data,
1223                              u.mgd.beacon_loss_work);
1224
1225         ieee80211_mgd_probe_ap(sdata, true);
1226 }
1227
1228 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1229 {
1230         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1231
1232         queue_work(sdata->local->hw.workqueue,
1233                    &sdata->u.mgd.beacon_loss_work);
1234 }
1235 EXPORT_SYMBOL(ieee80211_beacon_loss);
1236
1237 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1238                                      struct ieee80211_mgd_work *wk)
1239 {
1240         wk->state = IEEE80211_MGD_STATE_IDLE;
1241         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1242 }
1243
1244
1245 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1246                                      struct ieee80211_mgd_work *wk,
1247                                      struct ieee80211_mgmt *mgmt,
1248                                      size_t len)
1249 {
1250         u8 *pos;
1251         struct ieee802_11_elems elems;
1252
1253         pos = mgmt->u.auth.variable;
1254         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1255         if (!elems.challenge)
1256                 return;
1257         ieee80211_send_auth(sdata, 3, wk->auth_alg,
1258                             elems.challenge - 2, elems.challenge_len + 2,
1259                             wk->bss->cbss.bssid,
1260                             wk->key, wk->key_len, wk->key_idx);
1261         wk->auth_transaction = 4;
1262 }
1263
1264 static enum rx_mgmt_action __must_check
1265 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1266                        struct ieee80211_mgd_work *wk,
1267                        struct ieee80211_mgmt *mgmt, size_t len)
1268 {
1269         u16 auth_alg, auth_transaction, status_code;
1270
1271         if (wk->state != IEEE80211_MGD_STATE_AUTH)
1272                 return RX_MGMT_NONE;
1273
1274         if (len < 24 + 6)
1275                 return RX_MGMT_NONE;
1276
1277         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1278                 return RX_MGMT_NONE;
1279
1280         if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1281                 return RX_MGMT_NONE;
1282
1283         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1284         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1285         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1286
1287         if (auth_alg != wk->auth_alg ||
1288             auth_transaction != wk->auth_transaction)
1289                 return RX_MGMT_NONE;
1290
1291         if (status_code != WLAN_STATUS_SUCCESS) {
1292                 list_del(&wk->list);
1293                 kfree(wk);
1294                 return RX_MGMT_CFG80211_AUTH;
1295         }
1296
1297         switch (wk->auth_alg) {
1298         case WLAN_AUTH_OPEN:
1299         case WLAN_AUTH_LEAP:
1300         case WLAN_AUTH_FT:
1301                 ieee80211_auth_completed(sdata, wk);
1302                 return RX_MGMT_CFG80211_AUTH;
1303         case WLAN_AUTH_SHARED_KEY:
1304                 if (wk->auth_transaction == 4) {
1305                         ieee80211_auth_completed(sdata, wk);
1306                         return RX_MGMT_CFG80211_AUTH;
1307                 } else
1308                         ieee80211_auth_challenge(sdata, wk, mgmt, len);
1309                 break;
1310         }
1311
1312         return RX_MGMT_NONE;
1313 }
1314
1315
1316 static enum rx_mgmt_action __must_check
1317 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1318                          struct ieee80211_mgd_work *wk,
1319                          struct ieee80211_mgmt *mgmt, size_t len)
1320 {
1321         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1322         const u8 *bssid = NULL;
1323         u16 reason_code;
1324
1325         if (len < 24 + 2)
1326                 return RX_MGMT_NONE;
1327
1328         ASSERT_MGD_MTX(ifmgd);
1329
1330         if (wk)
1331                 bssid = wk->bss->cbss.bssid;
1332         else
1333                 bssid = ifmgd->associated->cbss.bssid;
1334
1335         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1336
1337         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1338                         sdata->dev->name, bssid, reason_code);
1339
1340         if (!wk) {
1341                 ieee80211_set_disassoc(sdata);
1342         } else {
1343                 list_del(&wk->list);
1344                 kfree(wk);
1345         }
1346
1347         return RX_MGMT_CFG80211_DEAUTH;
1348 }
1349
1350
1351 static enum rx_mgmt_action __must_check
1352 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1353                            struct ieee80211_mgmt *mgmt, size_t len)
1354 {
1355         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1356         u16 reason_code;
1357
1358         if (len < 24 + 2)
1359                 return RX_MGMT_NONE;
1360
1361         ASSERT_MGD_MTX(ifmgd);
1362
1363         if (WARN_ON(!ifmgd->associated))
1364                 return RX_MGMT_NONE;
1365
1366         if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1367                 return RX_MGMT_NONE;
1368
1369         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1370
1371         printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1372                         sdata->dev->name, reason_code);
1373
1374         ieee80211_set_disassoc(sdata);
1375         return RX_MGMT_CFG80211_DISASSOC;
1376 }
1377
1378
1379 static enum rx_mgmt_action __must_check
1380 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1381                              struct ieee80211_mgd_work *wk,
1382                              struct ieee80211_mgmt *mgmt, size_t len,
1383                              bool reassoc)
1384 {
1385         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1386         struct ieee80211_local *local = sdata->local;
1387         struct ieee80211_supported_band *sband;
1388         struct sta_info *sta;
1389         u32 rates, basic_rates;
1390         u16 capab_info, status_code, aid;
1391         struct ieee802_11_elems elems;
1392         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1393         u8 *pos;
1394         u32 changed = 0;
1395         int i, j;
1396         bool have_higher_than_11mbit = false, newsta = false;
1397         u16 ap_ht_cap_flags;
1398
1399         /*
1400          * AssocResp and ReassocResp have identical structure, so process both
1401          * of them in this function.
1402          */
1403
1404         if (len < 24 + 6)
1405                 return RX_MGMT_NONE;
1406
1407         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1408                 return RX_MGMT_NONE;
1409
1410         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1411         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1412         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1413
1414         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1415                "status=%d aid=%d)\n",
1416                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1417                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1418
1419         pos = mgmt->u.assoc_resp.variable;
1420         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1421
1422         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1423             elems.timeout_int && elems.timeout_int_len == 5 &&
1424             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1425                 u32 tu, ms;
1426                 tu = get_unaligned_le32(elems.timeout_int + 1);
1427                 ms = tu * 1024 / 1000;
1428                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1429                        "comeback duration %u TU (%u ms)\n",
1430                        sdata->dev->name, tu, ms);
1431                 wk->timeout = jiffies + msecs_to_jiffies(ms);
1432                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1433                         run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
1434                 return RX_MGMT_NONE;
1435         }
1436
1437         if (status_code != WLAN_STATUS_SUCCESS) {
1438                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1439                        sdata->dev->name, status_code);
1440                 list_del(&wk->list);
1441                 kfree(wk);
1442                 return RX_MGMT_CFG80211_ASSOC;
1443         }
1444
1445         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1446                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1447                        "set\n", sdata->dev->name, aid);
1448         aid &= ~(BIT(15) | BIT(14));
1449
1450         if (!elems.supp_rates) {
1451                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1452                        sdata->dev->name);
1453                 return RX_MGMT_NONE;
1454         }
1455
1456         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1457         ifmgd->aid = aid;
1458
1459         rcu_read_lock();
1460
1461         /* Add STA entry for the AP */
1462         sta = sta_info_get(local, wk->bss->cbss.bssid);
1463         if (!sta) {
1464                 newsta = true;
1465
1466                 rcu_read_unlock();
1467
1468                 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1469                 if (!sta) {
1470                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1471                                " the AP\n", sdata->dev->name);
1472                         return RX_MGMT_NONE;
1473                 }
1474
1475                 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1476                                    WLAN_STA_ASSOC_AP);
1477                 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1478                         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1479
1480                 rcu_read_lock();
1481         }
1482
1483         rates = 0;
1484         basic_rates = 0;
1485         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1486
1487         for (i = 0; i < elems.supp_rates_len; i++) {
1488                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1489                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1490
1491                 if (rate > 110)
1492                         have_higher_than_11mbit = true;
1493
1494                 for (j = 0; j < sband->n_bitrates; j++) {
1495                         if (sband->bitrates[j].bitrate == rate) {
1496                                 rates |= BIT(j);
1497                                 if (is_basic)
1498                                         basic_rates |= BIT(j);
1499                                 break;
1500                         }
1501                 }
1502         }
1503
1504         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1505                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1506                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1507
1508                 if (rate > 110)
1509                         have_higher_than_11mbit = true;
1510
1511                 for (j = 0; j < sband->n_bitrates; j++) {
1512                         if (sband->bitrates[j].bitrate == rate) {
1513                                 rates |= BIT(j);
1514                                 if (is_basic)
1515                                         basic_rates |= BIT(j);
1516                                 break;
1517                         }
1518                 }
1519         }
1520
1521         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1522         sdata->vif.bss_conf.basic_rates = basic_rates;
1523
1524         /* cf. IEEE 802.11 9.2.12 */
1525         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1526             have_higher_than_11mbit)
1527                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1528         else
1529                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1530
1531         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1532                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1533                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1534
1535         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1536
1537         rate_control_rate_init(sta);
1538
1539         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1540                 set_sta_flags(sta, WLAN_STA_MFP);
1541
1542         if (elems.wmm_param)
1543                 set_sta_flags(sta, WLAN_STA_WME);
1544
1545         if (newsta) {
1546                 int err = sta_info_insert(sta);
1547                 if (err) {
1548                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1549                                " the AP (error %d)\n", sdata->dev->name, err);
1550                         rcu_read_unlock();
1551                         return RX_MGMT_NONE;
1552                 }
1553         }
1554
1555         rcu_read_unlock();
1556
1557         if (elems.wmm_param)
1558                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1559                                          elems.wmm_param_len);
1560         else
1561                 ieee80211_set_wmm_default(sdata);
1562
1563         if (elems.ht_info_elem && elems.wmm_param &&
1564             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1565             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1566                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1567                                                wk->bss->cbss.bssid,
1568                                                ap_ht_cap_flags);
1569
1570         /* set AID and assoc capability,
1571          * ieee80211_set_associated() will tell the driver */
1572         bss_conf->aid = aid;
1573         bss_conf->assoc_capability = capab_info;
1574         ieee80211_set_associated(sdata, wk->bss, changed);
1575
1576         /*
1577          * Start timer to probe the connection to the AP now.
1578          * Also start the timer that will detect beacon loss.
1579          */
1580         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1581         mod_beacon_timer(sdata);
1582
1583         list_del(&wk->list);
1584         kfree(wk);
1585         return RX_MGMT_CFG80211_ASSOC;
1586 }
1587
1588
1589 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1590                                   struct ieee80211_mgmt *mgmt,
1591                                   size_t len,
1592                                   struct ieee80211_rx_status *rx_status,
1593                                   struct ieee802_11_elems *elems,
1594                                   bool beacon)
1595 {
1596         struct ieee80211_local *local = sdata->local;
1597         int freq;
1598         struct ieee80211_bss *bss;
1599         struct ieee80211_channel *channel;
1600
1601         if (elems->ds_params && elems->ds_params_len == 1)
1602                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1603         else
1604                 freq = rx_status->freq;
1605
1606         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1607
1608         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1609                 return;
1610
1611         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1612                                         channel, beacon);
1613         if (bss)
1614                 ieee80211_rx_bss_put(local, bss);
1615
1616         if (!sdata->u.mgd.associated)
1617                 return;
1618
1619         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1620             (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1621                                                         ETH_ALEN) == 0)) {
1622                 struct ieee80211_channel_sw_ie *sw_elem =
1623                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1624                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1625         }
1626 }
1627
1628
1629 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1630                                          struct ieee80211_mgd_work *wk,
1631                                          struct ieee80211_mgmt *mgmt, size_t len,
1632                                          struct ieee80211_rx_status *rx_status)
1633 {
1634         struct ieee80211_if_managed *ifmgd;
1635         size_t baselen;
1636         struct ieee802_11_elems elems;
1637
1638         ifmgd = &sdata->u.mgd;
1639
1640         ASSERT_MGD_MTX(ifmgd);
1641
1642         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1643                 return; /* ignore ProbeResp to foreign address */
1644
1645         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1646         if (baselen > len)
1647                 return;
1648
1649         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1650                                 &elems);
1651
1652         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1653
1654         /* direct probe may be part of the association flow */
1655         if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1656                 printk(KERN_DEBUG "%s direct probe responded\n",
1657                        sdata->dev->name);
1658                 wk->tries = 0;
1659                 wk->state = IEEE80211_MGD_STATE_AUTH;
1660                 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1661         }
1662
1663         if (ifmgd->associated &&
1664             memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1665             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1666                             IEEE80211_STA_CONNECTION_POLL)) {
1667                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1668                                   IEEE80211_STA_BEACON_POLL);
1669                 mutex_lock(&sdata->local->iflist_mtx);
1670                 ieee80211_recalc_ps(sdata->local, -1);
1671                 mutex_unlock(&sdata->local->iflist_mtx);
1672                 /*
1673                  * We've received a probe response, but are not sure whether
1674                  * we have or will be receiving any beacons or data, so let's
1675                  * schedule the timers again, just in case.
1676                  */
1677                 mod_beacon_timer(sdata);
1678                 mod_timer(&ifmgd->conn_mon_timer,
1679                           round_jiffies_up(jiffies +
1680                                            IEEE80211_CONNECTION_IDLE_TIME));
1681         }
1682 }
1683
1684 /*
1685  * This is the canonical list of information elements we care about,
1686  * the filter code also gives us all changes to the Microsoft OUI
1687  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1688  *
1689  * We implement beacon filtering in software since that means we can
1690  * avoid processing the frame here and in cfg80211, and userspace
1691  * will not be able to tell whether the hardware supports it or not.
1692  *
1693  * XXX: This list needs to be dynamic -- userspace needs to be able to
1694  *      add items it requires. It also needs to be able to tell us to
1695  *      look out for other vendor IEs.
1696  */
1697 static const u64 care_about_ies =
1698         (1ULL << WLAN_EID_COUNTRY) |
1699         (1ULL << WLAN_EID_ERP_INFO) |
1700         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1701         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1702         (1ULL << WLAN_EID_HT_CAPABILITY) |
1703         (1ULL << WLAN_EID_HT_INFORMATION);
1704
1705 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1706                                      struct ieee80211_mgmt *mgmt,
1707                                      size_t len,
1708                                      struct ieee80211_rx_status *rx_status)
1709 {
1710         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1711         size_t baselen;
1712         struct ieee802_11_elems elems;
1713         struct ieee80211_local *local = sdata->local;
1714         u32 changed = 0;
1715         bool erp_valid, directed_tim = false;
1716         u8 erp_value = 0;
1717         u32 ncrc;
1718         u8 *bssid;
1719
1720         ASSERT_MGD_MTX(ifmgd);
1721
1722         /* Process beacon from the current BSS */
1723         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1724         if (baselen > len)
1725                 return;
1726
1727         if (rx_status->freq != local->hw.conf.channel->center_freq)
1728                 return;
1729
1730         /*
1731          * We might have received a number of frames, among them a
1732          * disassoc frame and a beacon...
1733          */
1734         if (!ifmgd->associated)
1735                 return;
1736
1737         bssid = ifmgd->associated->cbss.bssid;
1738
1739         /*
1740          * And in theory even frames from a different AP we were just
1741          * associated to a split-second ago!
1742          */
1743         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1744                 return;
1745
1746         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1747 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1748                 if (net_ratelimit()) {
1749                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1750                                "to a received beacon\n", sdata->dev->name);
1751                 }
1752 #endif
1753                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1754                 mutex_lock(&local->iflist_mtx);
1755                 ieee80211_recalc_ps(local, -1);
1756                 mutex_unlock(&local->iflist_mtx);
1757         }
1758
1759         /*
1760          * Push the beacon loss detection into the future since
1761          * we are processing a beacon from the AP just now.
1762          */
1763         mod_beacon_timer(sdata);
1764
1765         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1766         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1767                                           len - baselen, &elems,
1768                                           care_about_ies, ncrc);
1769
1770         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1771                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1772                                                    ifmgd->aid);
1773
1774         if (ncrc != ifmgd->beacon_crc) {
1775                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1776                                       true);
1777
1778                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1779                                          elems.wmm_param_len);
1780         }
1781
1782         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1783                 if (directed_tim) {
1784                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1785                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1786                                 ieee80211_hw_config(local,
1787                                                     IEEE80211_CONF_CHANGE_PS);
1788                                 ieee80211_send_nullfunc(local, sdata, 0);
1789                         } else {
1790                                 local->pspolling = true;
1791
1792                                 /*
1793                                  * Here is assumed that the driver will be
1794                                  * able to send ps-poll frame and receive a
1795                                  * response even though power save mode is
1796                                  * enabled, but some drivers might require
1797                                  * to disable power save here. This needs
1798                                  * to be investigated.
1799                                  */
1800                                 ieee80211_send_pspoll(local, sdata);
1801                         }
1802                 }
1803         }
1804
1805         if (ncrc == ifmgd->beacon_crc)
1806                 return;
1807         ifmgd->beacon_crc = ncrc;
1808
1809         if (elems.erp_info && elems.erp_info_len >= 1) {
1810                 erp_valid = true;
1811                 erp_value = elems.erp_info[0];
1812         } else {
1813                 erp_valid = false;
1814         }
1815         changed |= ieee80211_handle_bss_capability(sdata,
1816                         le16_to_cpu(mgmt->u.beacon.capab_info),
1817                         erp_valid, erp_value);
1818
1819
1820         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1821             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1822                 struct sta_info *sta;
1823                 struct ieee80211_supported_band *sband;
1824                 u16 ap_ht_cap_flags;
1825
1826                 rcu_read_lock();
1827
1828                 sta = sta_info_get(local, bssid);
1829                 if (WARN_ON(!sta)) {
1830                         rcu_read_unlock();
1831                         return;
1832                 }
1833
1834                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1835
1836                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1837                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1838
1839                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1840
1841                 rcu_read_unlock();
1842
1843                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1844                                                bssid, ap_ht_cap_flags);
1845         }
1846
1847         if (elems.country_elem) {
1848                 /* Note we are only reviewing this on beacons
1849                  * for the BSSID we are associated to */
1850                 regulatory_hint_11d(local->hw.wiphy,
1851                         elems.country_elem, elems.country_elem_len);
1852
1853                 /* TODO: IBSS also needs this */
1854                 if (elems.pwr_constr_elem)
1855                         ieee80211_handle_pwr_constr(sdata,
1856                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1857                                 elems.pwr_constr_elem,
1858                                 elems.pwr_constr_elem_len);
1859         }
1860
1861         ieee80211_bss_info_change_notify(sdata, changed);
1862 }
1863
1864 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1865                                           struct sk_buff *skb)
1866 {
1867         struct ieee80211_local *local = sdata->local;
1868         struct ieee80211_mgmt *mgmt;
1869         u16 fc;
1870
1871         if (skb->len < 24)
1872                 return RX_DROP_MONITOR;
1873
1874         mgmt = (struct ieee80211_mgmt *) skb->data;
1875         fc = le16_to_cpu(mgmt->frame_control);
1876
1877         switch (fc & IEEE80211_FCTL_STYPE) {
1878         case IEEE80211_STYPE_PROBE_REQ:
1879         case IEEE80211_STYPE_PROBE_RESP:
1880         case IEEE80211_STYPE_BEACON:
1881         case IEEE80211_STYPE_AUTH:
1882         case IEEE80211_STYPE_ASSOC_RESP:
1883         case IEEE80211_STYPE_REASSOC_RESP:
1884         case IEEE80211_STYPE_DEAUTH:
1885         case IEEE80211_STYPE_DISASSOC:
1886         case IEEE80211_STYPE_ACTION:
1887                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1888                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1889                 return RX_QUEUED;
1890         }
1891
1892         return RX_DROP_MONITOR;
1893 }
1894
1895 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1896                                          struct sk_buff *skb)
1897 {
1898         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1899         struct ieee80211_rx_status *rx_status;
1900         struct ieee80211_mgmt *mgmt;
1901         struct ieee80211_mgd_work *wk;
1902         enum rx_mgmt_action rma = RX_MGMT_NONE;
1903         u16 fc;
1904
1905         rx_status = (struct ieee80211_rx_status *) skb->cb;
1906         mgmt = (struct ieee80211_mgmt *) skb->data;
1907         fc = le16_to_cpu(mgmt->frame_control);
1908
1909         mutex_lock(&ifmgd->mtx);
1910
1911         if (ifmgd->associated &&
1912             memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1913                                                         ETH_ALEN) == 0) {
1914                 switch (fc & IEEE80211_FCTL_STYPE) {
1915                 case IEEE80211_STYPE_BEACON:
1916                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1917                                                  rx_status);
1918                         break;
1919                 case IEEE80211_STYPE_PROBE_RESP:
1920                         ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1921                                                      skb->len, rx_status);
1922                         break;
1923                 case IEEE80211_STYPE_DEAUTH:
1924                         rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1925                                                        mgmt, skb->len);
1926                         break;
1927                 case IEEE80211_STYPE_DISASSOC:
1928                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1929                         break;
1930                 case IEEE80211_STYPE_ACTION:
1931                         /* XXX: differentiate, can only happen for CSA now! */
1932                         ieee80211_sta_process_chanswitch(sdata,
1933                                         &mgmt->u.action.u.chan_switch.sw_elem,
1934                                         ifmgd->associated);
1935                         break;
1936                 }
1937                 mutex_unlock(&ifmgd->mtx);
1938
1939                 switch (rma) {
1940                 case RX_MGMT_NONE:
1941                         /* no action */
1942                         break;
1943                 case RX_MGMT_CFG80211_DEAUTH:
1944                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len,
1945                                              NULL);
1946                         break;
1947                 case RX_MGMT_CFG80211_DISASSOC:
1948                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len,
1949                                                NULL);
1950                         break;
1951                 default:
1952                         WARN(1, "unexpected: %d", rma);
1953                 }
1954                 goto out;
1955         }
1956
1957         list_for_each_entry(wk, &ifmgd->work_list, list) {
1958                 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1959                         continue;
1960
1961                 switch (fc & IEEE80211_FCTL_STYPE) {
1962                 case IEEE80211_STYPE_PROBE_RESP:
1963                         ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
1964                                                      rx_status);
1965                         break;
1966                 case IEEE80211_STYPE_AUTH:
1967                         rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
1968                         break;
1969                 case IEEE80211_STYPE_ASSOC_RESP:
1970                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1971                                                            skb->len, false);
1972                         break;
1973                 case IEEE80211_STYPE_REASSOC_RESP:
1974                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1975                                                            skb->len, true);
1976                         break;
1977                 case IEEE80211_STYPE_DEAUTH:
1978                         rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
1979                                                        skb->len);
1980                         break;
1981                 }
1982                 /*
1983                  * We've processed this frame for that work, so it can't
1984                  * belong to another work struct.
1985                  * NB: this is also required for correctness because the
1986                  * called functions can free 'wk', and for 'rma'!
1987                  */
1988                 break;
1989         }
1990
1991         mutex_unlock(&ifmgd->mtx);
1992
1993         switch (rma) {
1994         case RX_MGMT_NONE:
1995                 /* no action */
1996                 break;
1997         case RX_MGMT_CFG80211_AUTH:
1998                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
1999                 break;
2000         case RX_MGMT_CFG80211_ASSOC:
2001                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
2002                 break;
2003         default:
2004                 WARN(1, "unexpected: %d", rma);
2005         }
2006
2007  out:
2008         kfree_skb(skb);
2009 }
2010
2011 static void ieee80211_sta_timer(unsigned long data)
2012 {
2013         struct ieee80211_sub_if_data *sdata =
2014                 (struct ieee80211_sub_if_data *) data;
2015         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2016         struct ieee80211_local *local = sdata->local;
2017
2018         if (local->quiescing) {
2019                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2020                 return;
2021         }
2022
2023         queue_work(local->hw.workqueue, &ifmgd->work);
2024 }
2025
2026 static void ieee80211_sta_work(struct work_struct *work)
2027 {
2028         struct ieee80211_sub_if_data *sdata =
2029                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2030         struct ieee80211_local *local = sdata->local;
2031         struct ieee80211_if_managed *ifmgd;
2032         struct sk_buff *skb;
2033         struct ieee80211_mgd_work *wk, *tmp;
2034         LIST_HEAD(free_work);
2035         enum rx_mgmt_action rma;
2036         bool anybusy = false;
2037
2038         if (!netif_running(sdata->dev))
2039                 return;
2040
2041         if (local->sw_scanning || local->hw_scanning)
2042                 return;
2043
2044         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2045                 return;
2046
2047         /*
2048          * Nothing should have been stuffed into the workqueue during
2049          * the suspend->resume cycle. If this WARN is seen then there
2050          * is a bug with either the driver suspend or something in
2051          * mac80211 stuffing into the workqueue which we haven't yet
2052          * cleared during mac80211's suspend cycle.
2053          */
2054         if (WARN_ON(local->suspended))
2055                 return;
2056
2057         ifmgd = &sdata->u.mgd;
2058
2059         /* first process frames to avoid timing out while a frame is pending */
2060         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2061                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2062
2063         /* then process the rest of the work */
2064         mutex_lock(&ifmgd->mtx);
2065
2066         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2067                             IEEE80211_STA_CONNECTION_POLL) &&
2068             ifmgd->associated) {
2069                 if (time_is_after_jiffies(ifmgd->probe_timeout))
2070                         run_again(ifmgd, ifmgd->probe_timeout);
2071                 else {
2072                         u8 bssid[ETH_ALEN];
2073                         /*
2074                          * We actually lost the connection ... or did we?
2075                          * Let's make sure!
2076                          */
2077                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2078                                           IEEE80211_STA_BEACON_POLL);
2079                         memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
2080                         printk(KERN_DEBUG "No probe response from AP %pM"
2081                                 " after %dms, disconnecting.\n",
2082                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2083                         ieee80211_set_disassoc(sdata);
2084                         mutex_unlock(&ifmgd->mtx);
2085                         /*
2086                          * must be outside lock due to cfg80211,
2087                          * but that's not a problem.
2088                          */
2089                         ieee80211_send_deauth_disassoc(sdata, bssid,
2090                                         IEEE80211_STYPE_DEAUTH,
2091                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2092                                         NULL);
2093                         mutex_lock(&ifmgd->mtx);
2094                 }
2095         }
2096
2097         list_for_each_entry(wk, &ifmgd->work_list, list) {
2098                 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
2099                         anybusy = true;
2100                         break;
2101                 }
2102         }
2103
2104         ieee80211_recalc_idle(local);
2105
2106         if (!anybusy) {
2107                 mutex_unlock(&ifmgd->mtx);
2108
2109                 if (test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
2110                         queue_delayed_work(local->hw.workqueue,
2111                                            &local->scan_work,
2112                                            round_jiffies_relative(0));
2113                 return;
2114         }
2115
2116         list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
2117                 if (time_is_after_jiffies(wk->timeout)) {
2118                         /*
2119                          * This work item isn't supposed to be worked on
2120                          * right now, but take care to adjust the timer
2121                          * properly.
2122                          */
2123                         run_again(ifmgd, wk->timeout);
2124                         continue;
2125                 }
2126
2127                 switch (wk->state) {
2128                 default:
2129                         WARN_ON(1);
2130                         /* fall through */
2131                 case IEEE80211_MGD_STATE_IDLE:
2132                         /* nothing */
2133                         rma = RX_MGMT_NONE;
2134                         break;
2135                 case IEEE80211_MGD_STATE_PROBE:
2136                         rma = ieee80211_direct_probe(sdata, wk);
2137                         break;
2138                 case IEEE80211_MGD_STATE_AUTH:
2139                         rma = ieee80211_authenticate(sdata, wk);
2140                         break;
2141                 case IEEE80211_MGD_STATE_ASSOC:
2142                         rma = ieee80211_associate(sdata, wk);
2143                         break;
2144                 }
2145
2146                 switch (rma) {
2147                 case RX_MGMT_NONE:
2148                         /* no action required */
2149                         break;
2150                 case RX_MGMT_CFG80211_AUTH_TO:
2151                 case RX_MGMT_CFG80211_ASSOC_TO:
2152                         list_del(&wk->list);
2153                         list_add(&wk->list, &free_work);
2154                         wk->tries = rma; /* small abuse but only local */
2155                         break;
2156                 default:
2157                         WARN(1, "unexpected: %d", rma);
2158                 }
2159         }
2160
2161         mutex_unlock(&ifmgd->mtx);
2162
2163         list_for_each_entry_safe(wk, tmp, &free_work, list) {
2164                 switch (wk->tries) {
2165                 case RX_MGMT_CFG80211_AUTH_TO:
2166                         cfg80211_send_auth_timeout(sdata->dev,
2167                                                    wk->bss->cbss.bssid);
2168                         break;
2169                 case RX_MGMT_CFG80211_ASSOC_TO:
2170                         cfg80211_send_assoc_timeout(sdata->dev,
2171                                                     wk->bss->cbss.bssid);
2172                         break;
2173                 default:
2174                         WARN(1, "unexpected: %d", wk->tries);
2175                 }
2176
2177                 list_del(&wk->list);
2178                 kfree(wk);
2179         }
2180
2181         ieee80211_recalc_idle(local);
2182 }
2183
2184 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2185 {
2186         struct ieee80211_sub_if_data *sdata =
2187                 (struct ieee80211_sub_if_data *) data;
2188         struct ieee80211_local *local = sdata->local;
2189
2190         if (local->quiescing)
2191                 return;
2192
2193         queue_work(sdata->local->hw.workqueue,
2194                    &sdata->u.mgd.beacon_loss_work);
2195 }
2196
2197 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2198 {
2199         struct ieee80211_sub_if_data *sdata =
2200                 (struct ieee80211_sub_if_data *) data;
2201         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2202         struct ieee80211_local *local = sdata->local;
2203
2204         if (local->quiescing)
2205                 return;
2206
2207         queue_work(local->hw.workqueue, &ifmgd->monitor_work);
2208 }
2209
2210 static void ieee80211_sta_monitor_work(struct work_struct *work)
2211 {
2212         struct ieee80211_sub_if_data *sdata =
2213                 container_of(work, struct ieee80211_sub_if_data,
2214                              u.mgd.monitor_work);
2215
2216         ieee80211_mgd_probe_ap(sdata, false);
2217 }
2218
2219 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2220 {
2221         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2222                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2223                                         IEEE80211_STA_CONNECTION_POLL);
2224
2225                 /* let's probe the connection once */
2226                 queue_work(sdata->local->hw.workqueue,
2227                            &sdata->u.mgd.monitor_work);
2228                 /* and do all the other regular work too */
2229                 queue_work(sdata->local->hw.workqueue,
2230                            &sdata->u.mgd.work);
2231         }
2232 }
2233
2234 #ifdef CONFIG_PM
2235 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2236 {
2237         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2238
2239         /*
2240          * we need to use atomic bitops for the running bits
2241          * only because both timers might fire at the same
2242          * time -- the code here is properly synchronised.
2243          */
2244
2245         cancel_work_sync(&ifmgd->work);
2246         cancel_work_sync(&ifmgd->beacon_loss_work);
2247         if (del_timer_sync(&ifmgd->timer))
2248                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2249
2250         cancel_work_sync(&ifmgd->chswitch_work);
2251         if (del_timer_sync(&ifmgd->chswitch_timer))
2252                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2253
2254         cancel_work_sync(&ifmgd->monitor_work);
2255         /* these will just be re-established on connection */
2256         del_timer_sync(&ifmgd->conn_mon_timer);
2257         del_timer_sync(&ifmgd->bcn_mon_timer);
2258 }
2259
2260 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2261 {
2262         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2263
2264         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2265                 add_timer(&ifmgd->timer);
2266         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2267                 add_timer(&ifmgd->chswitch_timer);
2268 }
2269 #endif
2270
2271 /* interface setup */
2272 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2273 {
2274         struct ieee80211_if_managed *ifmgd;
2275
2276         ifmgd = &sdata->u.mgd;
2277         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2278         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2279         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2280         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2281         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2282                     (unsigned long) sdata);
2283         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2284                     (unsigned long) sdata);
2285         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2286                     (unsigned long) sdata);
2287         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2288                     (unsigned long) sdata);
2289         skb_queue_head_init(&ifmgd->skb_queue);
2290
2291         INIT_LIST_HEAD(&ifmgd->work_list);
2292
2293         ifmgd->capab = WLAN_CAPABILITY_ESS;
2294         ifmgd->flags = 0;
2295         if (sdata->local->hw.queues >= 4)
2296                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2297
2298         mutex_init(&ifmgd->mtx);
2299 }
2300
2301 /* scan finished notification */
2302 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2303 {
2304         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2305
2306         /* Restart STA timers */
2307         rcu_read_lock();
2308         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2309                 ieee80211_restart_sta_timer(sdata);
2310         rcu_read_unlock();
2311 }
2312
2313 int ieee80211_max_network_latency(struct notifier_block *nb,
2314                                   unsigned long data, void *dummy)
2315 {
2316         s32 latency_usec = (s32) data;
2317         struct ieee80211_local *local =
2318                 container_of(nb, struct ieee80211_local,
2319                              network_latency_notifier);
2320
2321         mutex_lock(&local->iflist_mtx);
2322         ieee80211_recalc_ps(local, latency_usec);
2323         mutex_unlock(&local->iflist_mtx);
2324
2325         return 0;
2326 }
2327
2328 /* config hooks */
2329 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2330                        struct cfg80211_auth_request *req)
2331 {
2332         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2333         const u8 *ssid;
2334         struct ieee80211_mgd_work *wk;
2335         u16 auth_alg;
2336
2337         switch (req->auth_type) {
2338         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2339                 auth_alg = WLAN_AUTH_OPEN;
2340                 break;
2341         case NL80211_AUTHTYPE_SHARED_KEY:
2342                 auth_alg = WLAN_AUTH_SHARED_KEY;
2343                 break;
2344         case NL80211_AUTHTYPE_FT:
2345                 auth_alg = WLAN_AUTH_FT;
2346                 break;
2347         case NL80211_AUTHTYPE_NETWORK_EAP:
2348                 auth_alg = WLAN_AUTH_LEAP;
2349                 break;
2350         default:
2351                 return -EOPNOTSUPP;
2352         }
2353
2354         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2355         if (!wk)
2356                 return -ENOMEM;
2357
2358         wk->bss = (void *)req->bss;
2359
2360         if (req->ie && req->ie_len) {
2361                 memcpy(wk->ie, req->ie, req->ie_len);
2362                 wk->ie_len = req->ie_len;
2363         }
2364
2365         if (req->key && req->key_len) {
2366                 wk->key_len = req->key_len;
2367                 wk->key_idx = req->key_idx;
2368                 memcpy(wk->key, req->key, req->key_len);
2369         }
2370
2371         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2372         memcpy(wk->ssid, ssid + 2, ssid[1]);
2373         wk->ssid_len = ssid[1];
2374
2375         wk->state = IEEE80211_MGD_STATE_PROBE;
2376         wk->auth_alg = auth_alg;
2377
2378         /*
2379          * XXX: if still associated need to tell AP that we're going
2380          *      to sleep and then change channel etc.
2381          */
2382         sdata->local->oper_channel = req->bss->channel;
2383         ieee80211_hw_config(sdata->local, 0);
2384
2385         mutex_lock(&ifmgd->mtx);
2386         list_add(&wk->list, &sdata->u.mgd.work_list);
2387         mutex_unlock(&ifmgd->mtx);
2388
2389         queue_work(sdata->local->hw.workqueue, &sdata->u.mgd.work);
2390         return 0;
2391 }
2392
2393 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2394                         struct cfg80211_assoc_request *req)
2395 {
2396         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2397         struct ieee80211_mgd_work *wk, *found = NULL;
2398         int i, err;
2399
2400         mutex_lock(&ifmgd->mtx);
2401
2402         list_for_each_entry(wk, &ifmgd->work_list, list) {
2403                 if (&wk->bss->cbss == req->bss &&
2404                     wk->state == IEEE80211_MGD_STATE_IDLE) {
2405                         found = wk;
2406                         break;
2407                 }
2408         }
2409
2410         if (!found) {
2411                 err = -ENOLINK;
2412                 goto out;
2413         }
2414
2415         list_del(&found->list);
2416
2417         wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2418         if (!wk) {
2419                 list_add(&found->list, &ifmgd->work_list);
2420                 err = -ENOMEM;
2421                 goto out;
2422         }
2423
2424         list_add(&wk->list, &ifmgd->work_list);
2425
2426         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2427
2428         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2429                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2430                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2431                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2432                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2433
2434         sdata->local->oper_channel = req->bss->channel;
2435         ieee80211_hw_config(sdata->local, 0);
2436
2437         if (req->ie && req->ie_len) {
2438                 memcpy(wk->ie, req->ie, req->ie_len);
2439                 wk->ie_len = req->ie_len;
2440         } else
2441                 wk->ie_len = 0;
2442
2443         if (req->prev_bssid)
2444                 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2445
2446         wk->state = IEEE80211_MGD_STATE_ASSOC;
2447         wk->tries = 0;
2448
2449         if (req->use_mfp) {
2450                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2451                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2452         } else {
2453                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2454                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2455         }
2456
2457         if (req->crypto.control_port)
2458                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2459         else
2460                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2461
2462         queue_work(sdata->local->hw.workqueue, &sdata->u.mgd.work);
2463
2464         err = 0;
2465
2466  out:
2467         mutex_unlock(&ifmgd->mtx);
2468         return err;
2469 }
2470
2471 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2472                          struct cfg80211_deauth_request *req,
2473                          void *cookie)
2474 {
2475         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2476         struct ieee80211_mgd_work *wk;
2477         const u8 *bssid = NULL;
2478
2479         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2480                sdata->dev->name, req->reason_code);
2481
2482         mutex_lock(&ifmgd->mtx);
2483
2484         if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2485                 bssid = req->bss->bssid;
2486                 ieee80211_set_disassoc(sdata);
2487         } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2488                 if (&wk->bss->cbss == req->bss) {
2489                         bssid = req->bss->bssid;
2490                         list_del(&wk->list);
2491                         kfree(wk);
2492                         break;
2493                 }
2494         }
2495
2496         /* cfg80211 should catch this... */
2497         if (WARN_ON(!bssid)) {
2498                 mutex_unlock(&ifmgd->mtx);
2499                 return -ENOLINK;
2500         }
2501
2502         mutex_unlock(&ifmgd->mtx);
2503
2504         ieee80211_send_deauth_disassoc(sdata, bssid,
2505                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2506                         cookie);
2507
2508         return 0;
2509 }
2510
2511 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2512                            struct cfg80211_disassoc_request *req,
2513                            void *cookie)
2514 {
2515         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2516
2517         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2518                sdata->dev->name, req->reason_code);
2519
2520         mutex_lock(&ifmgd->mtx);
2521
2522         /* cfg80211 should catch that */
2523         if (WARN_ON(&ifmgd->associated->cbss != req->bss)) {
2524                 mutex_unlock(&ifmgd->mtx);
2525                 return -ENOLINK;
2526         }
2527
2528         ieee80211_set_disassoc(sdata);
2529
2530         mutex_unlock(&ifmgd->mtx);
2531
2532         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2533                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2534                         cookie);
2535         return 0;
2536 }