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 #define IEEE80211_MAX_PROBE_TRIES 5
  35
  36 /*
  37  * beacon loss detection timeout
  38  * XXX: should depend on beacon interval
  39  */
  40 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  41 /*
  42  * Time the connection can be idle before we probe
  43  * it to see if we can still talk to the AP.
  44  */
  45 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  46 /*
  47  * Time we wait for a probe response after sending
  48  * a probe request because of beacon loss or for
  49  * checking the connection still works.
  50  */
  51 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  52
  53 #define TMR_RUNNING_TIMER       0
  54 #define TMR_RUNNING_CHANSW      1
  55
  56 /*
  57  * All cfg80211 functions have to be called outside a locked
  58  * section so that they can acquire a lock themselves... This
  59  * is much simpler than queuing up things in cfg80211, but we
  60  * do need some indirection for that here.
  61  */
  62 enum rx_mgmt_action {
  63         /* no action required */
  64         RX_MGMT_NONE,
  65
  66         /* caller must call cfg80211_send_rx_auth() */
  67         RX_MGMT_CFG80211_AUTH,
  68
  69         /* caller must call cfg80211_send_rx_assoc() */
  70         RX_MGMT_CFG80211_ASSOC,
  71
  72         /* caller must call cfg80211_send_deauth() */
  73         RX_MGMT_CFG80211_DEAUTH,
  74
  75         /* caller must call cfg80211_send_disassoc() */
  76         RX_MGMT_CFG80211_DISASSOC,
  77
  78         /* caller must call cfg80211_auth_timeout() & free work */
  79         RX_MGMT_CFG80211_AUTH_TO,
  80
  81         /* caller must call cfg80211_assoc_timeout() & free work */
  82         RX_MGMT_CFG80211_ASSOC_TO,
  83 };
  84
  85 /* utils */
  86 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  87 {
  88         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  89 }
  90
  91 /*
  92  * We can have multiple work items (and connection probing)
  93  * scheduling this timer, but we need to take care to only
  94  * reschedule it when it should fire _earlier_ than it was
  95  * asked for before, or if it's not pending right now. This
  96  * function ensures that. Note that it then is required to
  97  * run this function for all timeouts after the first one
  98  * has happened -- the work that runs from this timer will
  99  * do that.
 100  */
 101 static void run_again(struct ieee80211_if_managed *ifmgd,
 102                              unsigned long timeout)
 103 {
 104         ASSERT_MGD_MTX(ifmgd);
 105
 106         if (!timer_pending(&ifmgd->timer) ||
 107             time_before(timeout, ifmgd->timer.expires))
 108                 mod_timer(&ifmgd->timer, timeout);
 109 }
 110
 111 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 112 {
 113         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 114                 return;
 115
 116         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 117                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 118 }
 119
 120 static int ecw2cw(int ecw)
 121 {
 122         return (1 << ecw) - 1;
 123 }
 124
 125 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
 126                                       struct ieee80211_supported_band *sband,
 127                                       u32 *rates)
 128 {
 129         int i, j, count;
 130         *rates = 0;
 131         count = 0;
 132         for (i = 0; i < bss->supp_rates_len; i++) {
 133                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
 134
 135                 for (j = 0; j < sband->n_bitrates; j++)
 136                         if (sband->bitrates[j].bitrate == rate) {
 137                                 *rates |= BIT(j);
 138                                 count++;
 139                                 break;
 140                         }
 141         }
 142
 143         return count;
 144 }
 145
 146 /*
 147  * ieee80211_enable_ht should be called only after the operating band
 148  * has been determined as ht configuration depends on the hw's
 149  * HT abilities for a specific band.
 150  */
 151 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 152                                struct ieee80211_ht_info *hti,
 153                                const u8 *bssid, u16 ap_ht_cap_flags)
 154 {
 155         struct ieee80211_local *local = sdata->local;
 156         struct ieee80211_supported_band *sband;
 157         struct sta_info *sta;
 158         u32 changed = 0;
 159         u16 ht_opmode;
 160         bool enable_ht = true, ht_changed;
 161         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 162
 163         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 164
 165         /* HT is not supported */
 166         if (!sband->ht_cap.ht_supported)
 167                 enable_ht = false;
 168
 169         /* check that channel matches the right operating channel */
 170         if (local->hw.conf.channel->center_freq !=
 171             ieee80211_channel_to_frequency(hti->control_chan))
 172                 enable_ht = false;
 173
 174         if (enable_ht) {
 175                 channel_type = NL80211_CHAN_HT20;
 176
 177                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 178                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 179                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 180                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 181                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 182                                 if (!(local->hw.conf.channel->flags &
 183                                     IEEE80211_CHAN_NO_HT40PLUS))
 184                                         channel_type = NL80211_CHAN_HT40PLUS;
 185                                 break;
 186                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 187                                 if (!(local->hw.conf.channel->flags &
 188                                     IEEE80211_CHAN_NO_HT40MINUS))
 189                                         channel_type = NL80211_CHAN_HT40MINUS;
 190                                 break;
 191                         }
 192                 }
 193         }
 194
 195         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 196                      channel_type != local->hw.conf.channel_type;
 197
 198         local->oper_channel_type = channel_type;
 199
 200         if (ht_changed) {
 201                 /* channel_type change automatically detected */
 202                 ieee80211_hw_config(local, 0);
 203
 204                 rcu_read_lock();
 205                 sta = sta_info_get(local, bssid);
 206                 if (sta)
 207                         rate_control_rate_update(local, sband, sta,
 208                                                  IEEE80211_RC_HT_CHANGED);
 209                 rcu_read_unlock();
 210         }
 211
 212         /* disable HT */
 213         if (!enable_ht)
 214                 return 0;
 215
 216         ht_opmode = le16_to_cpu(hti->operation_mode);
 217
 218         /* if bss configuration changed store the new one */
 219         if (!sdata->ht_opmode_valid ||
 220             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 221                 changed |= BSS_CHANGED_HT;
 222                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 223                 sdata->ht_opmode_valid = true;
 224         }
 225
 226         return changed;
 227 }
 228
 229 /* frame sending functions */
 230
 231 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 232                                  struct ieee80211_mgd_work *wk)
 233 {
 234         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 235         struct ieee80211_local *local = sdata->local;
 236         struct sk_buff *skb;
 237         struct ieee80211_mgmt *mgmt;
 238         u8 *pos;
 239         const u8 *ies, *ht_ie;
 240         int i, len, count, rates_len, supp_rates_len;
 241         u16 capab;
 242         int wmm = 0;
 243         struct ieee80211_supported_band *sband;
 244         u32 rates = 0;
 245
 246         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 247                             sizeof(*mgmt) + 200 + wk->ie_len +
 248                             wk->ssid_len);
 249         if (!skb) {
 250                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 251                        "frame\n", sdata->dev->name);
 252                 return;
 253         }
 254         skb_reserve(skb, local->hw.extra_tx_headroom);
 255
 256         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 257
 258         capab = ifmgd->capab;
 259
 260         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 261                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 262                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 263                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 264                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 265         }
 266
 267         if (wk->bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 268                 capab |= WLAN_CAPABILITY_PRIVACY;
 269         if (wk->bss->wmm_used)
 270                 wmm = 1;
 271
 272         /* get all rates supported by the device and the AP as
 273          * some APs don't like getting a superset of their rates
 274          * in the association request (e.g. D-Link DAP 1353 in
 275          * b-only mode) */
 276         rates_len = ieee80211_compatible_rates(wk->bss, sband, &rates);
 277
 278         if ((wk->bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 279             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 280                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 281
 282         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 283         memset(mgmt, 0, 24);
 284         memcpy(mgmt->da, wk->bss->cbss.bssid, ETH_ALEN);
 285         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 286         memcpy(mgmt->bssid, wk->bss->cbss.bssid, ETH_ALEN);
 287
 288         if (!is_zero_ether_addr(wk->prev_bssid)) {
 289                 skb_put(skb, 10);
 290                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 291                                                   IEEE80211_STYPE_REASSOC_REQ);
 292                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 293                 mgmt->u.reassoc_req.listen_interval =
 294                                 cpu_to_le16(local->hw.conf.listen_interval);
 295                 memcpy(mgmt->u.reassoc_req.current_ap, wk->prev_bssid,
 296                        ETH_ALEN);
 297         } else {
 298                 skb_put(skb, 4);
 299                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 300                                                   IEEE80211_STYPE_ASSOC_REQ);
 301                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 302                 mgmt->u.assoc_req.listen_interval =
 303                                 cpu_to_le16(local->hw.conf.listen_interval);
 304         }
 305
 306         /* SSID */
 307         ies = pos = skb_put(skb, 2 + wk->ssid_len);
 308         *pos++ = WLAN_EID_SSID;
 309         *pos++ = wk->ssid_len;
 310         memcpy(pos, wk->ssid, wk->ssid_len);
 311
 312         /* add all rates which were marked to be used above */
 313         supp_rates_len = rates_len;
 314         if (supp_rates_len > 8)
 315                 supp_rates_len = 8;
 316
 317         len = sband->n_bitrates;
 318         pos = skb_put(skb, supp_rates_len + 2);
 319         *pos++ = WLAN_EID_SUPP_RATES;
 320         *pos++ = supp_rates_len;
 321
 322         count = 0;
 323         for (i = 0; i < sband->n_bitrates; i++) {
 324                 if (BIT(i) & rates) {
 325                         int rate = sband->bitrates[i].bitrate;
 326                         *pos++ = (u8) (rate / 5);
 327                         if (++count == 8)
 328                                 break;
 329                 }
 330         }
 331
 332         if (rates_len > count) {
 333                 pos = skb_put(skb, rates_len - count + 2);
 334                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 335                 *pos++ = rates_len - count;
 336
 337                 for (i++; i < sband->n_bitrates; i++) {
 338                         if (BIT(i) & rates) {
 339                                 int rate = sband->bitrates[i].bitrate;
 340                                 *pos++ = (u8) (rate / 5);
 341                         }
 342                 }
 343         }
 344
 345         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 346                 /* 1. power capabilities */
 347                 pos = skb_put(skb, 4);
 348                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 349                 *pos++ = 2;
 350                 *pos++ = 0; /* min tx power */
 351                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 352
 353                 /* 2. supported channels */
 354                 /* TODO: get this in reg domain format */
 355                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 356                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 357                 *pos++ = 2 * sband->n_channels;
 358                 for (i = 0; i < sband->n_channels; i++) {
 359                         *pos++ = ieee80211_frequency_to_channel(
 360                                         sband->channels[i].center_freq);
 361                         *pos++ = 1; /* one channel in the subband*/
 362                 }
 363         }
 364
 365         if (wk->ie_len && wk->ie) {
 366                 pos = skb_put(skb, wk->ie_len);
 367                 memcpy(pos, wk->ie, wk->ie_len);
 368         }
 369
 370         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 371                 pos = skb_put(skb, 9);
 372                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 373                 *pos++ = 7; /* len */
 374                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 375                 *pos++ = 0x50;
 376                 *pos++ = 0xf2;
 377                 *pos++ = 2; /* WME */
 378                 *pos++ = 0; /* WME info */
 379                 *pos++ = 1; /* WME ver */
 380                 *pos++ = 0;
 381         }
 382
 383         /* wmm support is a must to HT */
 384         /*
 385          * IEEE802.11n does not allow TKIP/WEP as pairwise
 386          * ciphers in HT mode. We still associate in non-ht
 387          * mode (11a/b/g) if any one of these ciphers is
 388          * configured as pairwise.
 389          */
 390         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 391             sband->ht_cap.ht_supported &&
 392             (ht_ie = ieee80211_bss_get_ie(&wk->bss->cbss, WLAN_EID_HT_INFORMATION)) &&
 393             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 394             (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
 395                 struct ieee80211_ht_info *ht_info =
 396                         (struct ieee80211_ht_info *)(ht_ie + 2);
 397                 u16 cap = sband->ht_cap.cap;
 398                 __le16 tmp;
 399                 u32 flags = local->hw.conf.channel->flags;
 400
 401                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 402                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 403                         if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 404                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 405                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 406                         }
 407                         break;
 408                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 409                         if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 410                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 411                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 412                         }
 413                         break;
 414                 }
 415
 416                 tmp = cpu_to_le16(cap);
 417                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 418                 *pos++ = WLAN_EID_HT_CAPABILITY;
 419                 *pos++ = sizeof(struct ieee80211_ht_cap);
 420                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 421                 memcpy(pos, &tmp, sizeof(u16));
 422                 pos += sizeof(u16);
 423                 /* TODO: needs a define here for << 2 */
 424                 *pos++ = sband->ht_cap.ampdu_factor |
 425                          (sband->ht_cap.ampdu_density << 2);
 426                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 427         }
 428
 429         ieee80211_tx_skb(sdata, skb, 0);
 430 }
 431
 432
 433 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 434                                            const u8 *bssid, u16 stype, u16 reason,
 435                                            void *cookie)
 436 {
 437         struct ieee80211_local *local = sdata->local;
 438         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 439         struct sk_buff *skb;
 440         struct ieee80211_mgmt *mgmt;
 441
 442         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 443         if (!skb) {
 444                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 445                        "deauth/disassoc frame\n", sdata->dev->name);
 446                 return;
 447         }
 448         skb_reserve(skb, local->hw.extra_tx_headroom);
 449
 450         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 451         memset(mgmt, 0, 24);
 452         memcpy(mgmt->da, bssid, ETH_ALEN);
 453         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 454         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 455         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 456         skb_put(skb, 2);
 457         /* u.deauth.reason_code == u.disassoc.reason_code */
 458         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 459
 460         if (stype == IEEE80211_STYPE_DEAUTH)
 461                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len, cookie);
 462         else
 463                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len, cookie);
 464         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 465 }
 466
 467 void ieee80211_send_pspoll(struct ieee80211_local *local,
 468                            struct ieee80211_sub_if_data *sdata)
 469 {
 470         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 471         struct ieee80211_pspoll *pspoll;
 472         struct sk_buff *skb;
 473         u16 fc;
 474
 475         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 476         if (!skb) {
 477                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 478                        "pspoll frame\n", sdata->dev->name);
 479                 return;
 480         }
 481         skb_reserve(skb, local->hw.extra_tx_headroom);
 482
 483         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 484         memset(pspoll, 0, sizeof(*pspoll));
 485         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 486         pspoll->frame_control = cpu_to_le16(fc);
 487         pspoll->aid = cpu_to_le16(ifmgd->aid);
 488
 489         /* aid in PS-Poll has its two MSBs each set to 1 */
 490         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 491
 492         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 493         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 494
 495         ieee80211_tx_skb(sdata, skb, 0);
 496 }
 497
 498 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 499                              struct ieee80211_sub_if_data *sdata,
 500                              int powersave)
 501 {
 502         struct sk_buff *skb;
 503         struct ieee80211_hdr *nullfunc;
 504         __le16 fc;
 505
 506         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 507                 return;
 508
 509         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 510         if (!skb) {
 511                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 512                        "frame\n", sdata->dev->name);
 513                 return;
 514         }
 515         skb_reserve(skb, local->hw.extra_tx_headroom);
 516
 517         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 518         memset(nullfunc, 0, 24);
 519         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 520                          IEEE80211_FCTL_TODS);
 521         if (powersave)
 522                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 523         nullfunc->frame_control = fc;
 524         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 525         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 526         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 527
 528         ieee80211_tx_skb(sdata, skb, 0);
 529 }
 530
 531 /* spectrum management related things */
 532 static void ieee80211_chswitch_work(struct work_struct *work)
 533 {
 534         struct ieee80211_sub_if_data *sdata =
 535                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 536         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 537
 538         if (!netif_running(sdata->dev))
 539                 return;
 540
 541         mutex_lock(&ifmgd->mtx);
 542         if (!ifmgd->associated)
 543                 goto out;
 544
 545         sdata->local->oper_channel = sdata->local->csa_channel;
 546         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 547
 548         /* XXX: shouldn't really modify cfg80211-owned data! */
 549         ifmgd->associated->cbss.channel = sdata->local->oper_channel;
 550
 551         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 552                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 553  out:
 554         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 555         mutex_unlock(&ifmgd->mtx);
 556 }
 557
 558 static void ieee80211_chswitch_timer(unsigned long data)
 559 {
 560         struct ieee80211_sub_if_data *sdata =
 561                 (struct ieee80211_sub_if_data *) data;
 562         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 563
 564         if (sdata->local->quiescing) {
 565                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 566                 return;
 567         }
 568
 569         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 570 }
 571
 572 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 573                                       struct ieee80211_channel_sw_ie *sw_elem,
 574                                       struct ieee80211_bss *bss)
 575 {
 576         struct ieee80211_channel *new_ch;
 577         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 578         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 579
 580         ASSERT_MGD_MTX(ifmgd);
 581
 582         if (!ifmgd->associated)
 583                 return;
 584
 585         if (sdata->local->scanning)
 586                 return;
 587
 588         /* Disregard subsequent beacons if we are already running a timer
 589            processing a CSA */
 590
 591         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 592                 return;
 593
 594         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 595         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 596                 return;
 597
 598         sdata->local->csa_channel = new_ch;
 599
 600         if (sw_elem->count <= 1) {
 601                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 602         } else {
 603                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 604                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 605                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 606                 mod_timer(&ifmgd->chswitch_timer,
 607                           jiffies +
 608                           msecs_to_jiffies(sw_elem->count *
 609                                            bss->cbss.beacon_interval));
 610         }
 611 }
 612
 613 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 614                                         u16 capab_info, u8 *pwr_constr_elem,
 615                                         u8 pwr_constr_elem_len)
 616 {
 617         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 618
 619         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 620                 return;
 621
 622         /* Power constraint IE length should be 1 octet */
 623         if (pwr_constr_elem_len != 1)
 624                 return;
 625
 626         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 627             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 628                 sdata->local->power_constr_level = *pwr_constr_elem;
 629                 ieee80211_hw_config(sdata->local, 0);
 630         }
 631 }
 632
 633 /* powersave */
 634 static void ieee80211_enable_ps(struct ieee80211_local *local,
 635                                 struct ieee80211_sub_if_data *sdata)
 636 {
 637         struct ieee80211_conf *conf = &local->hw.conf;
 638
 639         /*
 640          * If we are scanning right now then the parameters will
 641          * take effect when scan finishes.
 642          */
 643         if (local->scanning)
 644                 return;
 645
 646         if (conf->dynamic_ps_timeout > 0 &&
 647             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 648                 mod_timer(&local->dynamic_ps_timer, jiffies +
 649                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 650         } else {
 651                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 652                         ieee80211_send_nullfunc(local, sdata, 1);
 653                 conf->flags |= IEEE80211_CONF_PS;
 654                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 655         }
 656 }
 657
 658 static void ieee80211_change_ps(struct ieee80211_local *local)
 659 {
 660         struct ieee80211_conf *conf = &local->hw.conf;
 661
 662         if (local->ps_sdata) {
 663                 ieee80211_enable_ps(local, local->ps_sdata);
 664         } else if (conf->flags & IEEE80211_CONF_PS) {
 665                 conf->flags &= ~IEEE80211_CONF_PS;
 666                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 667                 del_timer_sync(&local->dynamic_ps_timer);
 668                 cancel_work_sync(&local->dynamic_ps_enable_work);
 669         }
 670 }
 671
 672 /* need to hold RTNL or interface lock */
 673 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 674 {
 675         struct ieee80211_sub_if_data *sdata, *found = NULL;
 676         int count = 0;
 677
 678         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 679                 local->ps_sdata = NULL;
 680                 return;
 681         }
 682
 683         list_for_each_entry(sdata, &local->interfaces, list) {
 684                 if (!netif_running(sdata->dev))
 685                         continue;
 686                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 687                         continue;
 688                 found = sdata;
 689                 count++;
 690         }
 691
 692         if (count == 1 && found->u.mgd.powersave &&
 693             found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
 694             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 695                                     IEEE80211_STA_CONNECTION_POLL))) {
 696                 s32 beaconint_us;
 697
 698                 if (latency < 0)
 699                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 700
 701                 beaconint_us = ieee80211_tu_to_usec(
 702                                         found->vif.bss_conf.beacon_int);
 703
 704                 if (beaconint_us > latency) {
 705                         local->ps_sdata = NULL;
 706                 } else {
 707                         u8 dtimper = found->vif.bss_conf.dtim_period;
 708                         int maxslp = 1;
 709
 710                         if (dtimper > 1)
 711                                 maxslp = min_t(int, dtimper,
 712                                                     latency / beaconint_us);
 713
 714                         local->hw.conf.max_sleep_period = maxslp;
 715                         local->ps_sdata = found;
 716                 }
 717         } else {
 718                 local->ps_sdata = NULL;
 719         }
 720
 721         ieee80211_change_ps(local);
 722 }
 723
 724 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 725 {
 726         struct ieee80211_local *local =
 727                 container_of(work, struct ieee80211_local,
 728                              dynamic_ps_disable_work);
 729
 730         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 731                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 732                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 733         }
 734
 735         ieee80211_wake_queues_by_reason(&local->hw,
 736                                         IEEE80211_QUEUE_STOP_REASON_PS);
 737 }
 738
 739 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 740 {
 741         struct ieee80211_local *local =
 742                 container_of(work, struct ieee80211_local,
 743                              dynamic_ps_enable_work);
 744         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 745
 746         /* can only happen when PS was just disabled anyway */
 747         if (!sdata)
 748                 return;
 749
 750         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 751                 return;
 752
 753         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 754                 ieee80211_send_nullfunc(local, sdata, 1);
 755
 756         local->hw.conf.flags |= IEEE80211_CONF_PS;
 757         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 758 }
 759
 760 void ieee80211_dynamic_ps_timer(unsigned long data)
 761 {
 762         struct ieee80211_local *local = (void *) data;
 763
 764         if (local->quiescing || local->suspended)
 765                 return;
 766
 767         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 768 }
 769
 770 /* MLME */
 771 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 772                                      struct ieee80211_if_managed *ifmgd,
 773                                      u8 *wmm_param, size_t wmm_param_len)
 774 {
 775         struct ieee80211_tx_queue_params params;
 776         size_t left;
 777         int count;
 778         u8 *pos;
 779
 780         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 781                 return;
 782
 783         if (!wmm_param)
 784                 return;
 785
 786         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 787                 return;
 788         count = wmm_param[6] & 0x0f;
 789         if (count == ifmgd->wmm_last_param_set)
 790                 return;
 791         ifmgd->wmm_last_param_set = count;
 792
 793         pos = wmm_param + 8;
 794         left = wmm_param_len - 8;
 795
 796         memset(&params, 0, sizeof(params));
 797
 798         local->wmm_acm = 0;
 799         for (; left >= 4; left -= 4, pos += 4) {
 800                 int aci = (pos[0] >> 5) & 0x03;
 801                 int acm = (pos[0] >> 4) & 0x01;
 802                 int queue;
 803
 804                 switch (aci) {
 805                 case 1: /* AC_BK */
 806                         queue = 3;
 807                         if (acm)
 808                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 809                         break;
 810                 case 2: /* AC_VI */
 811                         queue = 1;
 812                         if (acm)
 813                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 814                         break;
 815                 case 3: /* AC_VO */
 816                         queue = 0;
 817                         if (acm)
 818                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 819                         break;
 820                 case 0: /* AC_BE */
 821                 default:
 822                         queue = 2;
 823                         if (acm)
 824                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 825                         break;
 826                 }
 827
 828                 params.aifs = pos[0] & 0x0f;
 829                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 830                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 831                 params.txop = get_unaligned_le16(pos + 2);
 832 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 833                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 834                        "cWmin=%d cWmax=%d txop=%d\n",
 835                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 836                        params.aifs, params.cw_min, params.cw_max, params.txop);
 837 #endif
 838                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 839                         printk(KERN_DEBUG "%s: failed to set TX queue "
 840                                "parameters for queue %d\n",
 841                                wiphy_name(local->hw.wiphy), queue);
 842         }
 843 }
 844
 845 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 846                                            u16 capab, bool erp_valid, u8 erp)
 847 {
 848         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 849         u32 changed = 0;
 850         bool use_protection;
 851         bool use_short_preamble;
 852         bool use_short_slot;
 853
 854         if (erp_valid) {
 855                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 856                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 857         } else {
 858                 use_protection = false;
 859                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 860         }
 861
 862         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 863
 864         if (use_protection != bss_conf->use_cts_prot) {
 865                 bss_conf->use_cts_prot = use_protection;
 866                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 867         }
 868
 869         if (use_short_preamble != bss_conf->use_short_preamble) {
 870                 bss_conf->use_short_preamble = use_short_preamble;
 871                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 872         }
 873
 874         if (use_short_slot != bss_conf->use_short_slot) {
 875                 bss_conf->use_short_slot = use_short_slot;
 876                 changed |= BSS_CHANGED_ERP_SLOT;
 877         }
 878
 879         return changed;
 880 }
 881
 882 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 883                                      struct ieee80211_mgd_work *wk,
 884                                      u32 bss_info_changed)
 885 {
 886         struct ieee80211_local *local = sdata->local;
 887         struct ieee80211_bss *bss = wk->bss;
 888
 889         bss_info_changed |= BSS_CHANGED_ASSOC;
 890         /* set timing information */
 891         sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 892         sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 893         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 894
 895         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 896         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 897                 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 898
 899         sdata->u.mgd.associated = bss;
 900         sdata->u.mgd.old_associate_work = wk;
 901         memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
 902
 903         /* just to be sure */
 904         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 905                                 IEEE80211_STA_BEACON_POLL);
 906
 907         /*
 908          * Always handle WMM once after association regardless
 909          * of the first value the AP uses. Setting -1 here has
 910          * that effect because the AP values is an unsigned
 911          * 4-bit value.
 912          */
 913         sdata->u.mgd.wmm_last_param_set = -1;
 914
 915         ieee80211_led_assoc(local, 1);
 916
 917         sdata->vif.bss_conf.assoc = 1;
 918         /*
 919          * For now just always ask the driver to update the basic rateset
 920          * when we have associated, we aren't checking whether it actually
 921          * changed or not.
 922          */
 923         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 924
 925         /* And the BSSID changed - we're associated now */
 926         bss_info_changed |= BSS_CHANGED_BSSID;
 927
 928         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 929
 930         mutex_lock(&local->iflist_mtx);
 931         ieee80211_recalc_ps(local, -1);
 932         mutex_unlock(&local->iflist_mtx);
 933
 934         netif_tx_start_all_queues(sdata->dev);
 935         netif_carrier_on(sdata->dev);
 936 }
 937
 938 static enum rx_mgmt_action __must_check
 939 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 940                        struct ieee80211_mgd_work *wk)
 941 {
 942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 943         struct ieee80211_local *local = sdata->local;
 944
 945         wk->tries++;
 946         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 947                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 948                        sdata->dev->name, wk->bss->cbss.bssid);
 949
 950                 /*
 951                  * Most likely AP is not in the range so remove the
 952                  * bss struct for that AP.
 953                  */
 954                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
 955
 956                 /*
 957                  * We might have a pending scan which had no chance to run yet
 958                  * due to work needing to be done. Hence, queue the STAs work
 959                  * again for that.
 960                  */
 961                 ieee80211_queue_work(&local->hw, &ifmgd->work);
 962                 return RX_MGMT_CFG80211_AUTH_TO;
 963         }
 964
 965         printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
 966                         sdata->dev->name, wk->bss->cbss.bssid,
 967                         wk->tries);
 968
 969         /*
 970          * Direct probe is sent to broadcast address as some APs
 971          * will not answer to direct packet in unassociated state.
 972          */
 973         ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
 974
 975         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 976         run_again(ifmgd, wk->timeout);
 977
 978         return RX_MGMT_NONE;
 979 }
 980
 981
 982 static enum rx_mgmt_action __must_check
 983 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 984                        struct ieee80211_mgd_work *wk)
 985 {
 986         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 987         struct ieee80211_local *local = sdata->local;
 988
 989         wk->tries++;
 990         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 991                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 992                        " timed out\n",
 993                        sdata->dev->name, wk->bss->cbss.bssid);
 994
 995                 /*
 996                  * Most likely AP is not in the range so remove the
 997                  * bss struct for that AP.
 998                  */
 999                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1000
1001                 /*
1002                  * We might have a pending scan which had no chance to run yet
1003                  * due to work needing to be done. Hence, queue the STAs work
1004                  * again for that.
1005                  */
1006                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1007                 return RX_MGMT_CFG80211_AUTH_TO;
1008         }
1009
1010         printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
1011                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1012
1013         ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
1014                             wk->bss->cbss.bssid, NULL, 0, 0);
1015         wk->auth_transaction = 2;
1016
1017         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1018         run_again(ifmgd, wk->timeout);
1019
1020         return RX_MGMT_NONE;
1021 }
1022
1023 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1024                                    bool deauth)
1025 {
1026         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1027         struct ieee80211_local *local = sdata->local;
1028         struct sta_info *sta;
1029         u32 changed = 0, config_changed = 0;
1030         u8 bssid[ETH_ALEN];
1031
1032         ASSERT_MGD_MTX(ifmgd);
1033
1034         if (WARN_ON(!ifmgd->associated))
1035                 return;
1036
1037         memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
1038
1039         ifmgd->associated = NULL;
1040         memset(ifmgd->bssid, 0, ETH_ALEN);
1041
1042         if (deauth) {
1043                 kfree(ifmgd->old_associate_work);
1044                 ifmgd->old_associate_work = NULL;
1045         } else {
1046                 struct ieee80211_mgd_work *wk = ifmgd->old_associate_work;
1047
1048                 wk->state = IEEE80211_MGD_STATE_IDLE;
1049                 list_add(&wk->list, &ifmgd->work_list);
1050         }
1051
1052         /*
1053          * we need to commit the associated = NULL change because the
1054          * scan code uses that to determine whether this iface should
1055          * go to/wake up from powersave or not -- and could otherwise
1056          * wake the queues erroneously.
1057          */
1058         smp_mb();
1059
1060         /*
1061          * Thus, we can only afterwards stop the queues -- to account
1062          * for the case where another CPU is finishing a scan at this
1063          * time -- we don't want the scan code to enable queues.
1064          */
1065
1066         netif_tx_stop_all_queues(sdata->dev);
1067         netif_carrier_off(sdata->dev);
1068
1069         rcu_read_lock();
1070         sta = sta_info_get(local, bssid);
1071         if (sta)
1072                 ieee80211_sta_tear_down_BA_sessions(sta);
1073         rcu_read_unlock();
1074
1075         changed |= ieee80211_reset_erp_info(sdata);
1076
1077         ieee80211_led_assoc(local, 0);
1078         changed |= BSS_CHANGED_ASSOC;
1079         sdata->vif.bss_conf.assoc = false;
1080
1081         ieee80211_set_wmm_default(sdata);
1082
1083         ieee80211_recalc_idle(local);
1084
1085         /* channel(_type) changes are handled by ieee80211_hw_config */
1086         local->oper_channel_type = NL80211_CHAN_NO_HT;
1087
1088         /* on the next assoc, re-program HT parameters */
1089         sdata->ht_opmode_valid = false;
1090
1091         local->power_constr_level = 0;
1092
1093         del_timer_sync(&local->dynamic_ps_timer);
1094         cancel_work_sync(&local->dynamic_ps_enable_work);
1095
1096         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1097                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1098                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1099         }
1100
1101         ieee80211_hw_config(local, config_changed);
1102
1103         /* And the BSSID changed -- not very interesting here */
1104         changed |= BSS_CHANGED_BSSID;
1105         ieee80211_bss_info_change_notify(sdata, changed);
1106
1107         rcu_read_lock();
1108
1109         sta = sta_info_get(local, bssid);
1110         if (!sta) {
1111                 rcu_read_unlock();
1112                 return;
1113         }
1114
1115         sta_info_unlink(&sta);
1116
1117         rcu_read_unlock();
1118
1119         sta_info_destroy(sta);
1120 }
1121
1122 static enum rx_mgmt_action __must_check
1123 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1124                     struct ieee80211_mgd_work *wk)
1125 {
1126         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1127         struct ieee80211_local *local = sdata->local;
1128
1129         wk->tries++;
1130         if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1131                 printk(KERN_DEBUG "%s: association with AP %pM"
1132                        " timed out\n",
1133                        sdata->dev->name, wk->bss->cbss.bssid);
1134
1135                 /*
1136                  * Most likely AP is not in the range so remove the
1137                  * bss struct for that AP.
1138                  */
1139                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1140
1141                 /*
1142                  * We might have a pending scan which had no chance to run yet
1143                  * due to work needing to be done. Hence, queue the STAs work
1144                  * again for that.
1145                  */
1146                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1147                 return RX_MGMT_CFG80211_ASSOC_TO;
1148         }
1149
1150         printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1151                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1152         ieee80211_send_assoc(sdata, wk);
1153
1154         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1155         run_again(ifmgd, wk->timeout);
1156
1157         return RX_MGMT_NONE;
1158 }
1159
1160 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1161                              struct ieee80211_hdr *hdr)
1162 {
1163         /*
1164          * We can postpone the mgd.timer whenever receiving unicast frames
1165          * from AP because we know that the connection is working both ways
1166          * at that time. But multicast frames (and hence also beacons) must
1167          * be ignored here, because we need to trigger the timer during
1168          * data idle periods for sending the periodic probe request to the
1169          * AP we're connected to.
1170          */
1171         if (is_multicast_ether_addr(hdr->addr1))
1172                 return;
1173
1174         mod_timer(&sdata->u.mgd.conn_mon_timer,
1175                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1176 }
1177
1178 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1179 {
1180         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1181         const u8 *ssid;
1182
1183         ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1184         ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1185                                  ssid + 2, ssid[1], NULL, 0);
1186
1187         ifmgd->probe_send_count++;
1188         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1189         run_again(ifmgd, ifmgd->probe_timeout);
1190 }
1191
1192 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1193                                    bool beacon)
1194 {
1195         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1196         bool already = false;
1197
1198         if (!netif_running(sdata->dev))
1199                 return;
1200
1201         if (sdata->local->scanning)
1202                 return;
1203
1204         mutex_lock(&ifmgd->mtx);
1205
1206         if (!ifmgd->associated)
1207                 goto out;
1208
1209 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1210         if (beacon && net_ratelimit())
1211                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1212                        "- sending probe request\n", sdata->dev->name);
1213 #endif
1214
1215         /*
1216          * The driver/our work has already reported this event or the
1217          * connection monitoring has kicked in and we have already sent
1218          * a probe request. Or maybe the AP died and the driver keeps
1219          * reporting until we disassociate...
1220          *
1221          * In either case we have to ignore the current call to this
1222          * function (except for setting the correct probe reason bit)
1223          * because otherwise we would reset the timer every time and
1224          * never check whether we received a probe response!
1225          */
1226         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1227                             IEEE80211_STA_CONNECTION_POLL))
1228                 already = true;
1229
1230         if (beacon)
1231                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1232         else
1233                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1234
1235         if (already)
1236                 goto out;
1237
1238         mutex_lock(&sdata->local->iflist_mtx);
1239         ieee80211_recalc_ps(sdata->local, -1);
1240         mutex_unlock(&sdata->local->iflist_mtx);
1241
1242         ifmgd->probe_send_count = 0;
1243         ieee80211_mgd_probe_ap_send(sdata);
1244  out:
1245         mutex_unlock(&ifmgd->mtx);
1246 }
1247
1248 void ieee80211_beacon_loss_work(struct work_struct *work)
1249 {
1250         struct ieee80211_sub_if_data *sdata =
1251                 container_of(work, struct ieee80211_sub_if_data,
1252                              u.mgd.beacon_loss_work);
1253
1254         ieee80211_mgd_probe_ap(sdata, true);
1255 }
1256
1257 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1258 {
1259         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1260
1261         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1262 }
1263 EXPORT_SYMBOL(ieee80211_beacon_loss);
1264
1265 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1266                                      struct ieee80211_mgd_work *wk)
1267 {
1268         wk->state = IEEE80211_MGD_STATE_IDLE;
1269         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1270 }
1271
1272
1273 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1274                                      struct ieee80211_mgd_work *wk,
1275                                      struct ieee80211_mgmt *mgmt,
1276                                      size_t len)
1277 {
1278         u8 *pos;
1279         struct ieee802_11_elems elems;
1280
1281         pos = mgmt->u.auth.variable;
1282         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1283         if (!elems.challenge)
1284                 return;
1285         ieee80211_send_auth(sdata, 3, wk->auth_alg,
1286                             elems.challenge - 2, elems.challenge_len + 2,
1287                             wk->bss->cbss.bssid,
1288                             wk->key, wk->key_len, wk->key_idx);
1289         wk->auth_transaction = 4;
1290 }
1291
1292 static enum rx_mgmt_action __must_check
1293 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1294                        struct ieee80211_mgd_work *wk,
1295                        struct ieee80211_mgmt *mgmt, size_t len)
1296 {
1297         u16 auth_alg, auth_transaction, status_code;
1298
1299         if (wk->state != IEEE80211_MGD_STATE_AUTH)
1300                 return RX_MGMT_NONE;
1301
1302         if (len < 24 + 6)
1303                 return RX_MGMT_NONE;
1304
1305         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1306                 return RX_MGMT_NONE;
1307
1308         if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1309                 return RX_MGMT_NONE;
1310
1311         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1312         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1313         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1314
1315         if (auth_alg != wk->auth_alg ||
1316             auth_transaction != wk->auth_transaction)
1317                 return RX_MGMT_NONE;
1318
1319         if (status_code != WLAN_STATUS_SUCCESS) {
1320                 list_del(&wk->list);
1321                 kfree(wk);
1322                 return RX_MGMT_CFG80211_AUTH;
1323         }
1324
1325         switch (wk->auth_alg) {
1326         case WLAN_AUTH_OPEN:
1327         case WLAN_AUTH_LEAP:
1328         case WLAN_AUTH_FT:
1329                 ieee80211_auth_completed(sdata, wk);
1330                 return RX_MGMT_CFG80211_AUTH;
1331         case WLAN_AUTH_SHARED_KEY:
1332                 if (wk->auth_transaction == 4) {
1333                         ieee80211_auth_completed(sdata, wk);
1334                         return RX_MGMT_CFG80211_AUTH;
1335                 } else
1336                         ieee80211_auth_challenge(sdata, wk, mgmt, len);
1337                 break;
1338         }
1339
1340         return RX_MGMT_NONE;
1341 }
1342
1343
1344 static enum rx_mgmt_action __must_check
1345 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1346                          struct ieee80211_mgd_work *wk,
1347                          struct ieee80211_mgmt *mgmt, size_t len)
1348 {
1349         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1350         const u8 *bssid = NULL;
1351         u16 reason_code;
1352
1353         if (len < 24 + 2)
1354                 return RX_MGMT_NONE;
1355
1356         ASSERT_MGD_MTX(ifmgd);
1357
1358         if (wk)
1359                 bssid = wk->bss->cbss.bssid;
1360         else
1361                 bssid = ifmgd->associated->cbss.bssid;
1362
1363         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1364
1365         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1366                         sdata->dev->name, bssid, reason_code);
1367
1368         if (!wk) {
1369                 ieee80211_set_disassoc(sdata, true);
1370         } else {
1371                 list_del(&wk->list);
1372                 kfree(wk);
1373         }
1374
1375         return RX_MGMT_CFG80211_DEAUTH;
1376 }
1377
1378
1379 static enum rx_mgmt_action __must_check
1380 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1381                            struct ieee80211_mgmt *mgmt, size_t len)
1382 {
1383         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1384         u16 reason_code;
1385
1386         if (len < 24 + 2)
1387                 return RX_MGMT_NONE;
1388
1389         ASSERT_MGD_MTX(ifmgd);
1390
1391         if (WARN_ON(!ifmgd->associated))
1392                 return RX_MGMT_NONE;
1393
1394         if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1395                 return RX_MGMT_NONE;
1396
1397         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1398
1399         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1400                         sdata->dev->name, mgmt->sa, reason_code);
1401
1402         ieee80211_set_disassoc(sdata, false);
1403         return RX_MGMT_CFG80211_DISASSOC;
1404 }
1405
1406
1407 static enum rx_mgmt_action __must_check
1408 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1409                              struct ieee80211_mgd_work *wk,
1410                              struct ieee80211_mgmt *mgmt, size_t len,
1411                              bool reassoc)
1412 {
1413         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1414         struct ieee80211_local *local = sdata->local;
1415         struct ieee80211_supported_band *sband;
1416         struct sta_info *sta;
1417         u32 rates, basic_rates;
1418         u16 capab_info, status_code, aid;
1419         struct ieee802_11_elems elems;
1420         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1421         u8 *pos;
1422         u32 changed = 0;
1423         int i, j;
1424         bool have_higher_than_11mbit = false, newsta = false;
1425         u16 ap_ht_cap_flags;
1426
1427         /*
1428          * AssocResp and ReassocResp have identical structure, so process both
1429          * of them in this function.
1430          */
1431
1432         if (len < 24 + 6)
1433                 return RX_MGMT_NONE;
1434
1435         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1436                 return RX_MGMT_NONE;
1437
1438         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1439         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1440         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1441
1442         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1443                "status=%d aid=%d)\n",
1444                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1445                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1446
1447         pos = mgmt->u.assoc_resp.variable;
1448         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1449
1450         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1451             elems.timeout_int && elems.timeout_int_len == 5 &&
1452             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1453                 u32 tu, ms;
1454                 tu = get_unaligned_le32(elems.timeout_int + 1);
1455                 ms = tu * 1024 / 1000;
1456                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1457                        "comeback duration %u TU (%u ms)\n",
1458                        sdata->dev->name, tu, ms);
1459                 wk->timeout = jiffies + msecs_to_jiffies(ms);
1460                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1461                         run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
1462                 return RX_MGMT_NONE;
1463         }
1464
1465         if (status_code != WLAN_STATUS_SUCCESS) {
1466                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1467                        sdata->dev->name, status_code);
1468                 wk->state = IEEE80211_MGD_STATE_IDLE;
1469                 return RX_MGMT_CFG80211_ASSOC;
1470         }
1471
1472         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1473                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1474                        "set\n", sdata->dev->name, aid);
1475         aid &= ~(BIT(15) | BIT(14));
1476
1477         if (!elems.supp_rates) {
1478                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1479                        sdata->dev->name);
1480                 return RX_MGMT_NONE;
1481         }
1482
1483         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1484         ifmgd->aid = aid;
1485
1486         rcu_read_lock();
1487
1488         /* Add STA entry for the AP */
1489         sta = sta_info_get(local, wk->bss->cbss.bssid);
1490         if (!sta) {
1491                 newsta = true;
1492
1493                 rcu_read_unlock();
1494
1495                 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1496                 if (!sta) {
1497                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1498                                " the AP\n", sdata->dev->name);
1499                         return RX_MGMT_NONE;
1500                 }
1501
1502                 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1503                                    WLAN_STA_ASSOC_AP);
1504                 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1505                         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1506
1507                 rcu_read_lock();
1508         }
1509
1510         rates = 0;
1511         basic_rates = 0;
1512         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1513
1514         for (i = 0; i < elems.supp_rates_len; i++) {
1515                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1516                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1517
1518                 if (rate > 110)
1519                         have_higher_than_11mbit = true;
1520
1521                 for (j = 0; j < sband->n_bitrates; j++) {
1522                         if (sband->bitrates[j].bitrate == rate) {
1523                                 rates |= BIT(j);
1524                                 if (is_basic)
1525                                         basic_rates |= BIT(j);
1526                                 break;
1527                         }
1528                 }
1529         }
1530
1531         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1532                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1533                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1534
1535                 if (rate > 110)
1536                         have_higher_than_11mbit = true;
1537
1538                 for (j = 0; j < sband->n_bitrates; j++) {
1539                         if (sband->bitrates[j].bitrate == rate) {
1540                                 rates |= BIT(j);
1541                                 if (is_basic)
1542                                         basic_rates |= BIT(j);
1543                                 break;
1544                         }
1545                 }
1546         }
1547
1548         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1549         sdata->vif.bss_conf.basic_rates = basic_rates;
1550
1551         /* cf. IEEE 802.11 9.2.12 */
1552         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1553             have_higher_than_11mbit)
1554                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1555         else
1556                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1557
1558         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1559                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1560                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1561
1562         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1563
1564         rate_control_rate_init(sta);
1565
1566         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1567                 set_sta_flags(sta, WLAN_STA_MFP);
1568
1569         if (elems.wmm_param)
1570                 set_sta_flags(sta, WLAN_STA_WME);
1571
1572         if (newsta) {
1573                 int err = sta_info_insert(sta);
1574                 if (err) {
1575                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1576                                " the AP (error %d)\n", sdata->dev->name, err);
1577                         rcu_read_unlock();
1578                         return RX_MGMT_NONE;
1579                 }
1580         }
1581
1582         rcu_read_unlock();
1583
1584         if (elems.wmm_param)
1585                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1586                                          elems.wmm_param_len);
1587         else
1588                 ieee80211_set_wmm_default(sdata);
1589
1590         if (elems.ht_info_elem && elems.wmm_param &&
1591             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1592             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1593                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1594                                                wk->bss->cbss.bssid,
1595                                                ap_ht_cap_flags);
1596
1597         /* delete work item -- must be before set_associated for PS */
1598         list_del(&wk->list);
1599
1600         /* set AID and assoc capability,
1601          * ieee80211_set_associated() will tell the driver */
1602         bss_conf->aid = aid;
1603         bss_conf->assoc_capability = capab_info;
1604         /* this will take ownership of wk */
1605         ieee80211_set_associated(sdata, wk, changed);
1606
1607         /*
1608          * Start timer to probe the connection to the AP now.
1609          * Also start the timer that will detect beacon loss.
1610          */
1611         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1612         mod_beacon_timer(sdata);
1613
1614         return RX_MGMT_CFG80211_ASSOC;
1615 }
1616
1617
1618 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1619                                   struct ieee80211_mgmt *mgmt,
1620                                   size_t len,
1621                                   struct ieee80211_rx_status *rx_status,
1622                                   struct ieee802_11_elems *elems,
1623                                   bool beacon)
1624 {
1625         struct ieee80211_local *local = sdata->local;
1626         int freq;
1627         struct ieee80211_bss *bss;
1628         struct ieee80211_channel *channel;
1629
1630         if (elems->ds_params && elems->ds_params_len == 1)
1631                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1632         else
1633                 freq = rx_status->freq;
1634
1635         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1636
1637         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1638                 return;
1639
1640         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1641                                         channel, beacon);
1642         if (bss)
1643                 ieee80211_rx_bss_put(local, bss);
1644
1645         if (!sdata->u.mgd.associated)
1646                 return;
1647
1648         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1649             (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1650                                                         ETH_ALEN) == 0)) {
1651                 struct ieee80211_channel_sw_ie *sw_elem =
1652                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1653                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1654         }
1655 }
1656
1657
1658 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1659                                          struct ieee80211_mgd_work *wk,
1660                                          struct ieee80211_mgmt *mgmt, size_t len,
1661                                          struct ieee80211_rx_status *rx_status)
1662 {
1663         struct ieee80211_if_managed *ifmgd;
1664         size_t baselen;
1665         struct ieee802_11_elems elems;
1666
1667         ifmgd = &sdata->u.mgd;
1668
1669         ASSERT_MGD_MTX(ifmgd);
1670
1671         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1672                 return; /* ignore ProbeResp to foreign address */
1673
1674         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1675         if (baselen > len)
1676                 return;
1677
1678         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1679                                 &elems);
1680
1681         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1682
1683         /* direct probe may be part of the association flow */
1684         if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1685                 printk(KERN_DEBUG "%s: direct probe responded\n",
1686                        sdata->dev->name);
1687                 wk->tries = 0;
1688                 wk->state = IEEE80211_MGD_STATE_AUTH;
1689                 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1690         }
1691
1692         if (ifmgd->associated &&
1693             memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1694             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1695                             IEEE80211_STA_CONNECTION_POLL)) {
1696                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1697                                   IEEE80211_STA_BEACON_POLL);
1698                 mutex_lock(&sdata->local->iflist_mtx);
1699                 ieee80211_recalc_ps(sdata->local, -1);
1700                 mutex_unlock(&sdata->local->iflist_mtx);
1701                 /*
1702                  * We've received a probe response, but are not sure whether
1703                  * we have or will be receiving any beacons or data, so let's
1704                  * schedule the timers again, just in case.
1705                  */
1706                 mod_beacon_timer(sdata);
1707                 mod_timer(&ifmgd->conn_mon_timer,
1708                           round_jiffies_up(jiffies +
1709                                            IEEE80211_CONNECTION_IDLE_TIME));
1710         }
1711 }
1712
1713 /*
1714  * This is the canonical list of information elements we care about,
1715  * the filter code also gives us all changes to the Microsoft OUI
1716  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1717  *
1718  * We implement beacon filtering in software since that means we can
1719  * avoid processing the frame here and in cfg80211, and userspace
1720  * will not be able to tell whether the hardware supports it or not.
1721  *
1722  * XXX: This list needs to be dynamic -- userspace needs to be able to
1723  *      add items it requires. It also needs to be able to tell us to
1724  *      look out for other vendor IEs.
1725  */
1726 static const u64 care_about_ies =
1727         (1ULL << WLAN_EID_COUNTRY) |
1728         (1ULL << WLAN_EID_ERP_INFO) |
1729         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1730         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1731         (1ULL << WLAN_EID_HT_CAPABILITY) |
1732         (1ULL << WLAN_EID_HT_INFORMATION);
1733
1734 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1735                                      struct ieee80211_mgmt *mgmt,
1736                                      size_t len,
1737                                      struct ieee80211_rx_status *rx_status)
1738 {
1739         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1740         size_t baselen;
1741         struct ieee802_11_elems elems;
1742         struct ieee80211_local *local = sdata->local;
1743         u32 changed = 0;
1744         bool erp_valid, directed_tim = false;
1745         u8 erp_value = 0;
1746         u32 ncrc;
1747         u8 *bssid;
1748
1749         ASSERT_MGD_MTX(ifmgd);
1750
1751         /* Process beacon from the current BSS */
1752         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1753         if (baselen > len)
1754                 return;
1755
1756         if (rx_status->freq != local->hw.conf.channel->center_freq)
1757                 return;
1758
1759         /*
1760          * We might have received a number of frames, among them a
1761          * disassoc frame and a beacon...
1762          */
1763         if (!ifmgd->associated)
1764                 return;
1765
1766         bssid = ifmgd->associated->cbss.bssid;
1767
1768         /*
1769          * And in theory even frames from a different AP we were just
1770          * associated to a split-second ago!
1771          */
1772         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1773                 return;
1774
1775         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1776 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1777                 if (net_ratelimit()) {
1778                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1779                                "to a received beacon\n", sdata->dev->name);
1780                 }
1781 #endif
1782                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1783                 mutex_lock(&local->iflist_mtx);
1784                 ieee80211_recalc_ps(local, -1);
1785                 mutex_unlock(&local->iflist_mtx);
1786         }
1787
1788         /*
1789          * Push the beacon loss detection into the future since
1790          * we are processing a beacon from the AP just now.
1791          */
1792         mod_beacon_timer(sdata);
1793
1794         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1795         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1796                                           len - baselen, &elems,
1797                                           care_about_ies, ncrc);
1798
1799         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1800                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1801                                                    ifmgd->aid);
1802
1803         if (ncrc != ifmgd->beacon_crc) {
1804                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1805                                       true);
1806
1807                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1808                                          elems.wmm_param_len);
1809         }
1810
1811         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1812                 if (directed_tim) {
1813                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1814                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1815                                 ieee80211_hw_config(local,
1816                                                     IEEE80211_CONF_CHANGE_PS);
1817                                 ieee80211_send_nullfunc(local, sdata, 0);
1818                         } else {
1819                                 local->pspolling = true;
1820
1821                                 /*
1822                                  * Here is assumed that the driver will be
1823                                  * able to send ps-poll frame and receive a
1824                                  * response even though power save mode is
1825                                  * enabled, but some drivers might require
1826                                  * to disable power save here. This needs
1827                                  * to be investigated.
1828                                  */
1829                                 ieee80211_send_pspoll(local, sdata);
1830                         }
1831                 }
1832         }
1833
1834         if (ncrc == ifmgd->beacon_crc)
1835                 return;
1836         ifmgd->beacon_crc = ncrc;
1837
1838         if (elems.erp_info && elems.erp_info_len >= 1) {
1839                 erp_valid = true;
1840                 erp_value = elems.erp_info[0];
1841         } else {
1842                 erp_valid = false;
1843         }
1844         changed |= ieee80211_handle_bss_capability(sdata,
1845                         le16_to_cpu(mgmt->u.beacon.capab_info),
1846                         erp_valid, erp_value);
1847
1848
1849         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1850             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1851                 struct sta_info *sta;
1852                 struct ieee80211_supported_band *sband;
1853                 u16 ap_ht_cap_flags;
1854
1855                 rcu_read_lock();
1856
1857                 sta = sta_info_get(local, bssid);
1858                 if (WARN_ON(!sta)) {
1859                         rcu_read_unlock();
1860                         return;
1861                 }
1862
1863                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1864
1865                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1866                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1867
1868                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1869
1870                 rcu_read_unlock();
1871
1872                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1873                                                bssid, ap_ht_cap_flags);
1874         }
1875
1876         /* Note: country IE parsing is done for us by cfg80211 */
1877         if (elems.country_elem) {
1878                 /* TODO: IBSS also needs this */
1879                 if (elems.pwr_constr_elem)
1880                         ieee80211_handle_pwr_constr(sdata,
1881                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1882                                 elems.pwr_constr_elem,
1883                                 elems.pwr_constr_elem_len);
1884         }
1885
1886         ieee80211_bss_info_change_notify(sdata, changed);
1887 }
1888
1889 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1890                                           struct sk_buff *skb)
1891 {
1892         struct ieee80211_local *local = sdata->local;
1893         struct ieee80211_mgmt *mgmt;
1894         u16 fc;
1895
1896         if (skb->len < 24)
1897                 return RX_DROP_MONITOR;
1898
1899         mgmt = (struct ieee80211_mgmt *) skb->data;
1900         fc = le16_to_cpu(mgmt->frame_control);
1901
1902         switch (fc & IEEE80211_FCTL_STYPE) {
1903         case IEEE80211_STYPE_PROBE_REQ:
1904         case IEEE80211_STYPE_PROBE_RESP:
1905         case IEEE80211_STYPE_BEACON:
1906         case IEEE80211_STYPE_AUTH:
1907         case IEEE80211_STYPE_ASSOC_RESP:
1908         case IEEE80211_STYPE_REASSOC_RESP:
1909         case IEEE80211_STYPE_DEAUTH:
1910         case IEEE80211_STYPE_DISASSOC:
1911         case IEEE80211_STYPE_ACTION:
1912                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1913                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1914                 return RX_QUEUED;
1915         }
1916
1917         return RX_DROP_MONITOR;
1918 }
1919
1920 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1921                                          struct sk_buff *skb)
1922 {
1923         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1924         struct ieee80211_rx_status *rx_status;
1925         struct ieee80211_mgmt *mgmt;
1926         struct ieee80211_mgd_work *wk;
1927         enum rx_mgmt_action rma = RX_MGMT_NONE;
1928         u16 fc;
1929
1930         rx_status = (struct ieee80211_rx_status *) skb->cb;
1931         mgmt = (struct ieee80211_mgmt *) skb->data;
1932         fc = le16_to_cpu(mgmt->frame_control);
1933
1934         mutex_lock(&ifmgd->mtx);
1935
1936         if (ifmgd->associated &&
1937             memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1938                                                         ETH_ALEN) == 0) {
1939                 switch (fc & IEEE80211_FCTL_STYPE) {
1940                 case IEEE80211_STYPE_BEACON:
1941                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1942                                                  rx_status);
1943                         break;
1944                 case IEEE80211_STYPE_PROBE_RESP:
1945                         ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1946                                                      skb->len, rx_status);
1947                         break;
1948                 case IEEE80211_STYPE_DEAUTH:
1949                         rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1950                                                        mgmt, skb->len);
1951                         break;
1952                 case IEEE80211_STYPE_DISASSOC:
1953                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1954                         break;
1955                 case IEEE80211_STYPE_ACTION:
1956                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1957                                 break;
1958
1959                         ieee80211_sta_process_chanswitch(sdata,
1960                                         &mgmt->u.action.u.chan_switch.sw_elem,
1961                                         ifmgd->associated);
1962                         break;
1963                 }
1964                 mutex_unlock(&ifmgd->mtx);
1965
1966                 switch (rma) {
1967                 case RX_MGMT_NONE:
1968                         /* no action */
1969                         break;
1970                 case RX_MGMT_CFG80211_DEAUTH:
1971                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len,
1972                                              NULL);
1973                         break;
1974                 case RX_MGMT_CFG80211_DISASSOC:
1975                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len,
1976                                                NULL);
1977                         break;
1978                 default:
1979                         WARN(1, "unexpected: %d", rma);
1980                 }
1981                 goto out;
1982         }
1983
1984         list_for_each_entry(wk, &ifmgd->work_list, list) {
1985                 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1986                         continue;
1987
1988                 switch (fc & IEEE80211_FCTL_STYPE) {
1989                 case IEEE80211_STYPE_PROBE_RESP:
1990                         ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
1991                                                      rx_status);
1992                         break;
1993                 case IEEE80211_STYPE_AUTH:
1994                         rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
1995                         break;
1996                 case IEEE80211_STYPE_ASSOC_RESP:
1997                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1998                                                            skb->len, false);
1999                         break;
2000                 case IEEE80211_STYPE_REASSOC_RESP:
2001                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2002                                                            skb->len, true);
2003                         break;
2004                 case IEEE80211_STYPE_DEAUTH:
2005                         rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
2006                                                        skb->len);
2007                         break;
2008                 }
2009                 /*
2010                  * We've processed this frame for that work, so it can't
2011                  * belong to another work struct.
2012                  * NB: this is also required for correctness because the
2013                  * called functions can free 'wk', and for 'rma'!
2014                  */
2015                 break;
2016         }
2017
2018         mutex_unlock(&ifmgd->mtx);
2019
2020         switch (rma) {
2021         case RX_MGMT_NONE:
2022                 /* no action */
2023                 break;
2024         case RX_MGMT_CFG80211_AUTH:
2025                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
2026                 break;
2027         case RX_MGMT_CFG80211_ASSOC:
2028                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
2029                 break;
2030         case RX_MGMT_CFG80211_DEAUTH:
2031                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len, NULL);
2032                 break;
2033         default:
2034                 WARN(1, "unexpected: %d", rma);
2035         }
2036
2037  out:
2038         kfree_skb(skb);
2039 }
2040
2041 static void ieee80211_sta_timer(unsigned long data)
2042 {
2043         struct ieee80211_sub_if_data *sdata =
2044                 (struct ieee80211_sub_if_data *) data;
2045         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2046         struct ieee80211_local *local = sdata->local;
2047
2048         if (local->quiescing) {
2049                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2050                 return;
2051         }
2052
2053         ieee80211_queue_work(&local->hw, &ifmgd->work);
2054 }
2055
2056 static void ieee80211_sta_work(struct work_struct *work)
2057 {
2058         struct ieee80211_sub_if_data *sdata =
2059                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2060         struct ieee80211_local *local = sdata->local;
2061         struct ieee80211_if_managed *ifmgd;
2062         struct sk_buff *skb;
2063         struct ieee80211_mgd_work *wk, *tmp;
2064         LIST_HEAD(free_work);
2065         enum rx_mgmt_action rma;
2066         bool anybusy = false;
2067
2068         if (!netif_running(sdata->dev))
2069                 return;
2070
2071         if (local->scanning)
2072                 return;
2073
2074         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2075                 return;
2076
2077         /*
2078          * ieee80211_queue_work() should have picked up most cases,
2079          * here we'll pick the the rest.
2080          */
2081         if (WARN(local->suspended, "STA MLME work scheduled while "
2082                  "going to suspend\n"))
2083                 return;
2084
2085         ifmgd = &sdata->u.mgd;
2086
2087         /* first process frames to avoid timing out while a frame is pending */
2088         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2089                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2090
2091         /* then process the rest of the work */
2092         mutex_lock(&ifmgd->mtx);
2093
2094         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2095                             IEEE80211_STA_CONNECTION_POLL) &&
2096             ifmgd->associated) {
2097                 u8 bssid[ETH_ALEN];
2098
2099                 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
2100                 if (time_is_after_jiffies(ifmgd->probe_timeout))
2101                         run_again(ifmgd, ifmgd->probe_timeout);
2102
2103                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
2104 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2105                         printk(KERN_DEBUG "No probe response from AP %pM"
2106                                 " after %dms, try %d\n", bssid,
2107                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
2108                                 ifmgd->probe_send_count);
2109 #endif
2110                         ieee80211_mgd_probe_ap_send(sdata);
2111                 } else {
2112                         /*
2113                          * We actually lost the connection ... or did we?
2114                          * Let's make sure!
2115                          */
2116                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2117                                           IEEE80211_STA_BEACON_POLL);
2118                         printk(KERN_DEBUG "No probe response from AP %pM"
2119                                 " after %dms, disconnecting.\n",
2120                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2121                         ieee80211_set_disassoc(sdata, true);
2122                         mutex_unlock(&ifmgd->mtx);
2123                         /*
2124                          * must be outside lock due to cfg80211,
2125                          * but that's not a problem.
2126                          */
2127                         ieee80211_send_deauth_disassoc(sdata, bssid,
2128                                         IEEE80211_STYPE_DEAUTH,
2129                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2130                                         NULL);
2131                         mutex_lock(&ifmgd->mtx);
2132                 }
2133         }
2134
2135
2136         ieee80211_recalc_idle(local);
2137
2138         list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
2139                 if (time_is_after_jiffies(wk->timeout)) {
2140                         /*
2141                          * This work item isn't supposed to be worked on
2142                          * right now, but take care to adjust the timer
2143                          * properly.
2144                          */
2145                         run_again(ifmgd, wk->timeout);
2146                         continue;
2147                 }
2148
2149                 switch (wk->state) {
2150                 default:
2151                         WARN_ON(1);
2152                         /* fall through */
2153                 case IEEE80211_MGD_STATE_IDLE:
2154                         /* nothing */
2155                         rma = RX_MGMT_NONE;
2156                         break;
2157                 case IEEE80211_MGD_STATE_PROBE:
2158                         rma = ieee80211_direct_probe(sdata, wk);
2159                         break;
2160                 case IEEE80211_MGD_STATE_AUTH:
2161                         rma = ieee80211_authenticate(sdata, wk);
2162                         break;
2163                 case IEEE80211_MGD_STATE_ASSOC:
2164                         rma = ieee80211_associate(sdata, wk);
2165                         break;
2166                 }
2167
2168                 switch (rma) {
2169                 case RX_MGMT_NONE:
2170                         /* no action required */
2171                         break;
2172                 case RX_MGMT_CFG80211_AUTH_TO:
2173                 case RX_MGMT_CFG80211_ASSOC_TO:
2174                         list_del(&wk->list);
2175                         list_add(&wk->list, &free_work);
2176                         wk->tries = rma; /* small abuse but only local */
2177                         break;
2178                 default:
2179                         WARN(1, "unexpected: %d", rma);
2180                 }
2181         }
2182
2183         list_for_each_entry(wk, &ifmgd->work_list, list) {
2184                 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
2185                         anybusy = true;
2186                         break;
2187                 }
2188         }
2189         if (!anybusy &&
2190             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
2191                 ieee80211_queue_delayed_work(&local->hw,
2192                                              &local->scan_work,
2193                                              round_jiffies_relative(0));
2194
2195         mutex_unlock(&ifmgd->mtx);
2196
2197         list_for_each_entry_safe(wk, tmp, &free_work, list) {
2198                 switch (wk->tries) {
2199                 case RX_MGMT_CFG80211_AUTH_TO:
2200                         cfg80211_send_auth_timeout(sdata->dev,
2201                                                    wk->bss->cbss.bssid);
2202                         break;
2203                 case RX_MGMT_CFG80211_ASSOC_TO:
2204                         cfg80211_send_assoc_timeout(sdata->dev,
2205                                                     wk->bss->cbss.bssid);
2206                         break;
2207                 default:
2208                         WARN(1, "unexpected: %d", wk->tries);
2209                 }
2210
2211                 list_del(&wk->list);
2212                 kfree(wk);
2213         }
2214
2215         ieee80211_recalc_idle(local);
2216 }
2217
2218 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2219 {
2220         struct ieee80211_sub_if_data *sdata =
2221                 (struct ieee80211_sub_if_data *) data;
2222         struct ieee80211_local *local = sdata->local;
2223
2224         if (local->quiescing)
2225                 return;
2226
2227         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
2228 }
2229
2230 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2231 {
2232         struct ieee80211_sub_if_data *sdata =
2233                 (struct ieee80211_sub_if_data *) data;
2234         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2235         struct ieee80211_local *local = sdata->local;
2236
2237         if (local->quiescing)
2238                 return;
2239
2240         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2241 }
2242
2243 static void ieee80211_sta_monitor_work(struct work_struct *work)
2244 {
2245         struct ieee80211_sub_if_data *sdata =
2246                 container_of(work, struct ieee80211_sub_if_data,
2247                              u.mgd.monitor_work);
2248
2249         ieee80211_mgd_probe_ap(sdata, false);
2250 }
2251
2252 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2253 {
2254         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2255                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2256                                         IEEE80211_STA_CONNECTION_POLL);
2257
2258                 /* let's probe the connection once */
2259                 ieee80211_queue_work(&sdata->local->hw,
2260                            &sdata->u.mgd.monitor_work);
2261                 /* and do all the other regular work too */
2262                 ieee80211_queue_work(&sdata->local->hw,
2263                            &sdata->u.mgd.work);
2264         }
2265 }
2266
2267 #ifdef CONFIG_PM
2268 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2269 {
2270         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2271
2272         /*
2273          * we need to use atomic bitops for the running bits
2274          * only because both timers might fire at the same
2275          * time -- the code here is properly synchronised.
2276          */
2277
2278         cancel_work_sync(&ifmgd->work);
2279         cancel_work_sync(&ifmgd->beacon_loss_work);
2280         if (del_timer_sync(&ifmgd->timer))
2281                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2282
2283         cancel_work_sync(&ifmgd->chswitch_work);
2284         if (del_timer_sync(&ifmgd->chswitch_timer))
2285                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2286
2287         cancel_work_sync(&ifmgd->monitor_work);
2288         /* these will just be re-established on connection */
2289         del_timer_sync(&ifmgd->conn_mon_timer);
2290         del_timer_sync(&ifmgd->bcn_mon_timer);
2291 }
2292
2293 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2294 {
2295         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2296
2297         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2298                 add_timer(&ifmgd->timer);
2299         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2300                 add_timer(&ifmgd->chswitch_timer);
2301 }
2302 #endif
2303
2304 /* interface setup */
2305 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2306 {
2307         struct ieee80211_if_managed *ifmgd;
2308
2309         ifmgd = &sdata->u.mgd;
2310         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2311         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2312         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2313         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2314         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2315                     (unsigned long) sdata);
2316         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2317                     (unsigned long) sdata);
2318         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2319                     (unsigned long) sdata);
2320         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2321                     (unsigned long) sdata);
2322         skb_queue_head_init(&ifmgd->skb_queue);
2323
2324         INIT_LIST_HEAD(&ifmgd->work_list);
2325
2326         ifmgd->capab = WLAN_CAPABILITY_ESS;
2327         ifmgd->flags = 0;
2328         if (sdata->local->hw.queues >= 4)
2329                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2330
2331         mutex_init(&ifmgd->mtx);
2332 }
2333
2334 /* scan finished notification */
2335 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2336 {
2337         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2338
2339         /* Restart STA timers */
2340         rcu_read_lock();
2341         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2342                 ieee80211_restart_sta_timer(sdata);
2343         rcu_read_unlock();
2344 }
2345
2346 int ieee80211_max_network_latency(struct notifier_block *nb,
2347                                   unsigned long data, void *dummy)
2348 {
2349         s32 latency_usec = (s32) data;
2350         struct ieee80211_local *local =
2351                 container_of(nb, struct ieee80211_local,
2352                              network_latency_notifier);
2353
2354         mutex_lock(&local->iflist_mtx);
2355         ieee80211_recalc_ps(local, latency_usec);
2356         mutex_unlock(&local->iflist_mtx);
2357
2358         return 0;
2359 }
2360
2361 /* config hooks */
2362 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2363                        struct cfg80211_auth_request *req)
2364 {
2365         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2366         const u8 *ssid;
2367         struct ieee80211_mgd_work *wk;
2368         u16 auth_alg;
2369
2370         switch (req->auth_type) {
2371         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2372                 auth_alg = WLAN_AUTH_OPEN;
2373                 break;
2374         case NL80211_AUTHTYPE_SHARED_KEY:
2375                 auth_alg = WLAN_AUTH_SHARED_KEY;
2376                 break;
2377         case NL80211_AUTHTYPE_FT:
2378                 auth_alg = WLAN_AUTH_FT;
2379                 break;
2380         case NL80211_AUTHTYPE_NETWORK_EAP:
2381                 auth_alg = WLAN_AUTH_LEAP;
2382                 break;
2383         default:
2384                 return -EOPNOTSUPP;
2385         }
2386
2387         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2388         if (!wk)
2389                 return -ENOMEM;
2390
2391         wk->bss = (void *)req->bss;
2392
2393         if (req->ie && req->ie_len) {
2394                 memcpy(wk->ie, req->ie, req->ie_len);
2395                 wk->ie_len = req->ie_len;
2396         }
2397
2398         if (req->key && req->key_len) {
2399                 wk->key_len = req->key_len;
2400                 wk->key_idx = req->key_idx;
2401                 memcpy(wk->key, req->key, req->key_len);
2402         }
2403
2404         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2405         memcpy(wk->ssid, ssid + 2, ssid[1]);
2406         wk->ssid_len = ssid[1];
2407
2408         wk->state = IEEE80211_MGD_STATE_PROBE;
2409         wk->auth_alg = auth_alg;
2410         wk->timeout = jiffies; /* run right away */
2411
2412         /*
2413          * XXX: if still associated need to tell AP that we're going
2414          *      to sleep and then change channel etc.
2415          */
2416         sdata->local->oper_channel = req->bss->channel;
2417         ieee80211_hw_config(sdata->local, 0);
2418
2419         mutex_lock(&ifmgd->mtx);
2420         list_add(&wk->list, &sdata->u.mgd.work_list);
2421         mutex_unlock(&ifmgd->mtx);
2422
2423         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2424         return 0;
2425 }
2426
2427 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2428                         struct cfg80211_assoc_request *req)
2429 {
2430         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2431         struct ieee80211_mgd_work *wk, *found = NULL;
2432         int i, err;
2433
2434         mutex_lock(&ifmgd->mtx);
2435
2436         list_for_each_entry(wk, &ifmgd->work_list, list) {
2437                 if (&wk->bss->cbss == req->bss &&
2438                     wk->state == IEEE80211_MGD_STATE_IDLE) {
2439                         found = wk;
2440                         break;
2441                 }
2442         }
2443
2444         if (!found) {
2445                 err = -ENOLINK;
2446                 goto out;
2447         }
2448
2449         list_del(&found->list);
2450
2451         wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2452         if (!wk) {
2453                 list_add(&found->list, &ifmgd->work_list);
2454                 err = -ENOMEM;
2455                 goto out;
2456         }
2457
2458         list_add(&wk->list, &ifmgd->work_list);
2459
2460         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2461
2462         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2463                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2464                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2465                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2466                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2467
2468         sdata->local->oper_channel = req->bss->channel;
2469         ieee80211_hw_config(sdata->local, 0);
2470
2471         if (req->ie && req->ie_len) {
2472                 memcpy(wk->ie, req->ie, req->ie_len);
2473                 wk->ie_len = req->ie_len;
2474         } else
2475                 wk->ie_len = 0;
2476
2477         if (req->prev_bssid)
2478                 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2479
2480         wk->state = IEEE80211_MGD_STATE_ASSOC;
2481         wk->tries = 0;
2482         wk->timeout = jiffies; /* run right away */
2483
2484         if (req->use_mfp) {
2485                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2486                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2487         } else {
2488                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2489                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2490         }
2491
2492         if (req->crypto.control_port)
2493                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2494         else
2495                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2496
2497         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2498
2499         err = 0;
2500
2501  out:
2502         mutex_unlock(&ifmgd->mtx);
2503         return err;
2504 }
2505
2506 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2507                          struct cfg80211_deauth_request *req,
2508                          void *cookie)
2509 {
2510         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2511         struct ieee80211_mgd_work *wk;
2512         const u8 *bssid = NULL;
2513
2514         mutex_lock(&ifmgd->mtx);
2515
2516         if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2517                 bssid = req->bss->bssid;
2518                 ieee80211_set_disassoc(sdata, true);
2519         } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2520                 if (&wk->bss->cbss == req->bss) {
2521                         bssid = req->bss->bssid;
2522                         list_del(&wk->list);
2523                         kfree(wk);
2524                         break;
2525                 }
2526         }
2527
2528         /*
2529          * cfg80211 should catch this ... but it's racy since
2530          * we can receive a deauth frame, process it, hand it
2531          * to cfg80211 while that's in a locked section already
2532          * trying to tell us that the user wants to disconnect.
2533          */
2534         if (!bssid) {
2535                 mutex_unlock(&ifmgd->mtx);
2536                 return -ENOLINK;
2537         }
2538
2539         mutex_unlock(&ifmgd->mtx);
2540
2541         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2542                sdata->dev->name, bssid, req->reason_code);
2543
2544         ieee80211_send_deauth_disassoc(sdata, bssid,
2545                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2546                         cookie);
2547
2548         return 0;
2549 }
2550
2551 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2552                            struct cfg80211_disassoc_request *req,
2553                            void *cookie)
2554 {
2555         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2556
2557         mutex_lock(&ifmgd->mtx);
2558
2559         /*
2560          * cfg80211 should catch this ... but it's racy since
2561          * we can receive a disassoc frame, process it, hand it
2562          * to cfg80211 while that's in a locked section already
2563          * trying to tell us that the user wants to disconnect.
2564          */
2565         if (&ifmgd->associated->cbss != req->bss) {
2566                 mutex_unlock(&ifmgd->mtx);
2567                 return -ENOLINK;
2568         }
2569
2570         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2571                sdata->dev->name, req->bss->bssid, req->reason_code);
2572
2573         ieee80211_set_disassoc(sdata, false);
2574
2575         mutex_unlock(&ifmgd->mtx);
2576
2577         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2578                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2579                         cookie);
2580         return 0;
2581 }