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
 654                 if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
 655                         conf->flags |= IEEE80211_CONF_PS;
 656                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 657                 }
 658         }
 659 }
 660
 661 static void ieee80211_change_ps(struct ieee80211_local *local)
 662 {
 663         struct ieee80211_conf *conf = &local->hw.conf;
 664
 665         if (local->ps_sdata) {
 666                 ieee80211_enable_ps(local, local->ps_sdata);
 667         } else if (conf->flags & IEEE80211_CONF_PS) {
 668                 conf->flags &= ~IEEE80211_CONF_PS;
 669                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 670                 del_timer_sync(&local->dynamic_ps_timer);
 671                 cancel_work_sync(&local->dynamic_ps_enable_work);
 672         }
 673 }
 674
 675 /* need to hold RTNL or interface lock */
 676 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 677 {
 678         struct ieee80211_sub_if_data *sdata, *found = NULL;
 679         int count = 0;
 680
 681         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 682                 local->ps_sdata = NULL;
 683                 return;
 684         }
 685
 686         list_for_each_entry(sdata, &local->interfaces, list) {
 687                 if (!netif_running(sdata->dev))
 688                         continue;
 689                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 690                         continue;
 691                 found = sdata;
 692                 count++;
 693         }
 694
 695         if (count == 1 && found->u.mgd.powersave &&
 696             found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
 697             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 698                                     IEEE80211_STA_CONNECTION_POLL))) {
 699                 s32 beaconint_us;
 700
 701                 if (latency < 0)
 702                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 703
 704                 beaconint_us = ieee80211_tu_to_usec(
 705                                         found->vif.bss_conf.beacon_int);
 706
 707                 if (beaconint_us > latency) {
 708                         local->ps_sdata = NULL;
 709                 } else {
 710                         u8 dtimper = found->vif.bss_conf.dtim_period;
 711                         int maxslp = 1;
 712
 713                         if (dtimper > 1)
 714                                 maxslp = min_t(int, dtimper,
 715                                                     latency / beaconint_us);
 716
 717                         local->hw.conf.max_sleep_period = maxslp;
 718                         local->ps_sdata = found;
 719                 }
 720         } else {
 721                 local->ps_sdata = NULL;
 722         }
 723
 724         ieee80211_change_ps(local);
 725 }
 726
 727 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 728 {
 729         struct ieee80211_local *local =
 730                 container_of(work, struct ieee80211_local,
 731                              dynamic_ps_disable_work);
 732
 733         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 734                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 735                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 736         }
 737
 738         ieee80211_wake_queues_by_reason(&local->hw,
 739                                         IEEE80211_QUEUE_STOP_REASON_PS);
 740 }
 741
 742 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 743 {
 744         struct ieee80211_local *local =
 745                 container_of(work, struct ieee80211_local,
 746                              dynamic_ps_enable_work);
 747         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 748         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 749
 750         /* can only happen when PS was just disabled anyway */
 751         if (!sdata)
 752                 return;
 753
 754         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 755                 return;
 756
 757         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 758             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 759                 ieee80211_send_nullfunc(local, sdata, 1);
 760
 761         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) ||
 762             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 763                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 764                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 765                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 766         }
 767 }
 768
 769 void ieee80211_dynamic_ps_timer(unsigned long data)
 770 {
 771         struct ieee80211_local *local = (void *) data;
 772
 773         if (local->quiescing || local->suspended)
 774                 return;
 775
 776         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 777 }
 778
 779 /* MLME */
 780 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 781                                      struct ieee80211_if_managed *ifmgd,
 782                                      u8 *wmm_param, size_t wmm_param_len)
 783 {
 784         struct ieee80211_tx_queue_params params;
 785         size_t left;
 786         int count;
 787         u8 *pos;
 788
 789         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 790                 return;
 791
 792         if (!wmm_param)
 793                 return;
 794
 795         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 796                 return;
 797         count = wmm_param[6] & 0x0f;
 798         if (count == ifmgd->wmm_last_param_set)
 799                 return;
 800         ifmgd->wmm_last_param_set = count;
 801
 802         pos = wmm_param + 8;
 803         left = wmm_param_len - 8;
 804
 805         memset(&params, 0, sizeof(params));
 806
 807         local->wmm_acm = 0;
 808         for (; left >= 4; left -= 4, pos += 4) {
 809                 int aci = (pos[0] >> 5) & 0x03;
 810                 int acm = (pos[0] >> 4) & 0x01;
 811                 int queue;
 812
 813                 switch (aci) {
 814                 case 1: /* AC_BK */
 815                         queue = 3;
 816                         if (acm)
 817                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 818                         break;
 819                 case 2: /* AC_VI */
 820                         queue = 1;
 821                         if (acm)
 822                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 823                         break;
 824                 case 3: /* AC_VO */
 825                         queue = 0;
 826                         if (acm)
 827                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 828                         break;
 829                 case 0: /* AC_BE */
 830                 default:
 831                         queue = 2;
 832                         if (acm)
 833                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 834                         break;
 835                 }
 836
 837                 params.aifs = pos[0] & 0x0f;
 838                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 839                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 840                 params.txop = get_unaligned_le16(pos + 2);
 841 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 842                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 843                        "cWmin=%d cWmax=%d txop=%d\n",
 844                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 845                        params.aifs, params.cw_min, params.cw_max, params.txop);
 846 #endif
 847                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 848                         printk(KERN_DEBUG "%s: failed to set TX queue "
 849                                "parameters for queue %d\n",
 850                                wiphy_name(local->hw.wiphy), queue);
 851         }
 852 }
 853
 854 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 855                                            u16 capab, bool erp_valid, u8 erp)
 856 {
 857         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 858         u32 changed = 0;
 859         bool use_protection;
 860         bool use_short_preamble;
 861         bool use_short_slot;
 862
 863         if (erp_valid) {
 864                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 865                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 866         } else {
 867                 use_protection = false;
 868                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 869         }
 870
 871         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 872
 873         if (use_protection != bss_conf->use_cts_prot) {
 874                 bss_conf->use_cts_prot = use_protection;
 875                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 876         }
 877
 878         if (use_short_preamble != bss_conf->use_short_preamble) {
 879                 bss_conf->use_short_preamble = use_short_preamble;
 880                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 881         }
 882
 883         if (use_short_slot != bss_conf->use_short_slot) {
 884                 bss_conf->use_short_slot = use_short_slot;
 885                 changed |= BSS_CHANGED_ERP_SLOT;
 886         }
 887
 888         return changed;
 889 }
 890
 891 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 892                                      struct ieee80211_mgd_work *wk,
 893                                      u32 bss_info_changed)
 894 {
 895         struct ieee80211_local *local = sdata->local;
 896         struct ieee80211_bss *bss = wk->bss;
 897
 898         bss_info_changed |= BSS_CHANGED_ASSOC;
 899         /* set timing information */
 900         sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 901         sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 902         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 903
 904         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 905         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 906                 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 907
 908         sdata->u.mgd.associated = bss;
 909         sdata->u.mgd.old_associate_work = wk;
 910         memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
 911
 912         /* just to be sure */
 913         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 914                                 IEEE80211_STA_BEACON_POLL);
 915
 916         /*
 917          * Always handle WMM once after association regardless
 918          * of the first value the AP uses. Setting -1 here has
 919          * that effect because the AP values is an unsigned
 920          * 4-bit value.
 921          */
 922         sdata->u.mgd.wmm_last_param_set = -1;
 923
 924         ieee80211_led_assoc(local, 1);
 925
 926         sdata->vif.bss_conf.assoc = 1;
 927         /*
 928          * For now just always ask the driver to update the basic rateset
 929          * when we have associated, we aren't checking whether it actually
 930          * changed or not.
 931          */
 932         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 933
 934         /* And the BSSID changed - we're associated now */
 935         bss_info_changed |= BSS_CHANGED_BSSID;
 936
 937         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 938
 939         mutex_lock(&local->iflist_mtx);
 940         ieee80211_recalc_ps(local, -1);
 941         mutex_unlock(&local->iflist_mtx);
 942
 943         netif_tx_start_all_queues(sdata->dev);
 944         netif_carrier_on(sdata->dev);
 945 }
 946
 947 static enum rx_mgmt_action __must_check
 948 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 949                        struct ieee80211_mgd_work *wk)
 950 {
 951         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 952         struct ieee80211_local *local = sdata->local;
 953
 954         wk->tries++;
 955         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 956                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 957                        sdata->dev->name, wk->bss->cbss.bssid);
 958
 959                 /*
 960                  * Most likely AP is not in the range so remove the
 961                  * bss struct for that AP.
 962                  */
 963                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
 964
 965                 /*
 966                  * We might have a pending scan which had no chance to run yet
 967                  * due to work needing to be done. Hence, queue the STAs work
 968                  * again for that.
 969                  */
 970                 ieee80211_queue_work(&local->hw, &ifmgd->work);
 971                 return RX_MGMT_CFG80211_AUTH_TO;
 972         }
 973
 974         printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
 975                         sdata->dev->name, wk->bss->cbss.bssid,
 976                         wk->tries);
 977
 978         /*
 979          * Direct probe is sent to broadcast address as some APs
 980          * will not answer to direct packet in unassociated state.
 981          */
 982         ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
 983
 984         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 985         run_again(ifmgd, wk->timeout);
 986
 987         return RX_MGMT_NONE;
 988 }
 989
 990
 991 static enum rx_mgmt_action __must_check
 992 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 993                        struct ieee80211_mgd_work *wk)
 994 {
 995         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 996         struct ieee80211_local *local = sdata->local;
 997
 998         wk->tries++;
 999         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
1000                 printk(KERN_DEBUG "%s: authentication with AP %pM"
1001                        " timed out\n",
1002                        sdata->dev->name, wk->bss->cbss.bssid);
1003
1004                 /*
1005                  * Most likely AP is not in the range so remove the
1006                  * bss struct for that AP.
1007                  */
1008                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1009
1010                 /*
1011                  * We might have a pending scan which had no chance to run yet
1012                  * due to work needing to be done. Hence, queue the STAs work
1013                  * again for that.
1014                  */
1015                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1016                 return RX_MGMT_CFG80211_AUTH_TO;
1017         }
1018
1019         printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
1020                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1021
1022         ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
1023                             wk->bss->cbss.bssid, NULL, 0, 0);
1024         wk->auth_transaction = 2;
1025
1026         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1027         run_again(ifmgd, wk->timeout);
1028
1029         return RX_MGMT_NONE;
1030 }
1031
1032 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1033                                    bool deauth)
1034 {
1035         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1036         struct ieee80211_local *local = sdata->local;
1037         struct sta_info *sta;
1038         u32 changed = 0, config_changed = 0;
1039         u8 bssid[ETH_ALEN];
1040
1041         ASSERT_MGD_MTX(ifmgd);
1042
1043         if (WARN_ON(!ifmgd->associated))
1044                 return;
1045
1046         memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
1047
1048         ifmgd->associated = NULL;
1049         memset(ifmgd->bssid, 0, ETH_ALEN);
1050
1051         if (deauth) {
1052                 kfree(ifmgd->old_associate_work);
1053                 ifmgd->old_associate_work = NULL;
1054         } else {
1055                 struct ieee80211_mgd_work *wk = ifmgd->old_associate_work;
1056
1057                 wk->state = IEEE80211_MGD_STATE_IDLE;
1058                 list_add(&wk->list, &ifmgd->work_list);
1059         }
1060
1061         /*
1062          * we need to commit the associated = NULL change because the
1063          * scan code uses that to determine whether this iface should
1064          * go to/wake up from powersave or not -- and could otherwise
1065          * wake the queues erroneously.
1066          */
1067         smp_mb();
1068
1069         /*
1070          * Thus, we can only afterwards stop the queues -- to account
1071          * for the case where another CPU is finishing a scan at this
1072          * time -- we don't want the scan code to enable queues.
1073          */
1074
1075         netif_tx_stop_all_queues(sdata->dev);
1076         netif_carrier_off(sdata->dev);
1077
1078         rcu_read_lock();
1079         sta = sta_info_get(local, bssid);
1080         if (sta)
1081                 ieee80211_sta_tear_down_BA_sessions(sta);
1082         rcu_read_unlock();
1083
1084         changed |= ieee80211_reset_erp_info(sdata);
1085
1086         ieee80211_led_assoc(local, 0);
1087         changed |= BSS_CHANGED_ASSOC;
1088         sdata->vif.bss_conf.assoc = false;
1089
1090         ieee80211_set_wmm_default(sdata);
1091
1092         ieee80211_recalc_idle(local);
1093
1094         /* channel(_type) changes are handled by ieee80211_hw_config */
1095         local->oper_channel_type = NL80211_CHAN_NO_HT;
1096
1097         /* on the next assoc, re-program HT parameters */
1098         sdata->ht_opmode_valid = false;
1099
1100         local->power_constr_level = 0;
1101
1102         del_timer_sync(&local->dynamic_ps_timer);
1103         cancel_work_sync(&local->dynamic_ps_enable_work);
1104
1105         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1106                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1107                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1108         }
1109
1110         ieee80211_hw_config(local, config_changed);
1111
1112         /* And the BSSID changed -- not very interesting here */
1113         changed |= BSS_CHANGED_BSSID;
1114         ieee80211_bss_info_change_notify(sdata, changed);
1115
1116         rcu_read_lock();
1117
1118         sta = sta_info_get(local, bssid);
1119         if (!sta) {
1120                 rcu_read_unlock();
1121                 return;
1122         }
1123
1124         sta_info_unlink(&sta);
1125
1126         rcu_read_unlock();
1127
1128         sta_info_destroy(sta);
1129 }
1130
1131 static enum rx_mgmt_action __must_check
1132 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1133                     struct ieee80211_mgd_work *wk)
1134 {
1135         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1136         struct ieee80211_local *local = sdata->local;
1137
1138         wk->tries++;
1139         if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1140                 printk(KERN_DEBUG "%s: association with AP %pM"
1141                        " timed out\n",
1142                        sdata->dev->name, wk->bss->cbss.bssid);
1143
1144                 /*
1145                  * Most likely AP is not in the range so remove the
1146                  * bss struct for that AP.
1147                  */
1148                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1149
1150                 /*
1151                  * We might have a pending scan which had no chance to run yet
1152                  * due to work needing to be done. Hence, queue the STAs work
1153                  * again for that.
1154                  */
1155                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1156                 return RX_MGMT_CFG80211_ASSOC_TO;
1157         }
1158
1159         printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1160                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1161         ieee80211_send_assoc(sdata, wk);
1162
1163         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1164         run_again(ifmgd, wk->timeout);
1165
1166         return RX_MGMT_NONE;
1167 }
1168
1169 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1170                              struct ieee80211_hdr *hdr)
1171 {
1172         /*
1173          * We can postpone the mgd.timer whenever receiving unicast frames
1174          * from AP because we know that the connection is working both ways
1175          * at that time. But multicast frames (and hence also beacons) must
1176          * be ignored here, because we need to trigger the timer during
1177          * data idle periods for sending the periodic probe request to the
1178          * AP we're connected to.
1179          */
1180         if (is_multicast_ether_addr(hdr->addr1))
1181                 return;
1182
1183         mod_timer(&sdata->u.mgd.conn_mon_timer,
1184                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1185 }
1186
1187 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1188 {
1189         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1190         const u8 *ssid;
1191
1192         ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1193         ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1194                                  ssid + 2, ssid[1], NULL, 0);
1195
1196         ifmgd->probe_send_count++;
1197         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1198         run_again(ifmgd, ifmgd->probe_timeout);
1199 }
1200
1201 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1202                                    bool beacon)
1203 {
1204         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1205         bool already = false;
1206
1207         if (!netif_running(sdata->dev))
1208                 return;
1209
1210         if (sdata->local->scanning)
1211                 return;
1212
1213         mutex_lock(&ifmgd->mtx);
1214
1215         if (!ifmgd->associated)
1216                 goto out;
1217
1218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1219         if (beacon && net_ratelimit())
1220                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1221                        "- sending probe request\n", sdata->dev->name);
1222 #endif
1223
1224         /*
1225          * The driver/our work has already reported this event or the
1226          * connection monitoring has kicked in and we have already sent
1227          * a probe request. Or maybe the AP died and the driver keeps
1228          * reporting until we disassociate...
1229          *
1230          * In either case we have to ignore the current call to this
1231          * function (except for setting the correct probe reason bit)
1232          * because otherwise we would reset the timer every time and
1233          * never check whether we received a probe response!
1234          */
1235         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1236                             IEEE80211_STA_CONNECTION_POLL))
1237                 already = true;
1238
1239         if (beacon)
1240                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1241         else
1242                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1243
1244         if (already)
1245                 goto out;
1246
1247         mutex_lock(&sdata->local->iflist_mtx);
1248         ieee80211_recalc_ps(sdata->local, -1);
1249         mutex_unlock(&sdata->local->iflist_mtx);
1250
1251         ifmgd->probe_send_count = 0;
1252         ieee80211_mgd_probe_ap_send(sdata);
1253  out:
1254         mutex_unlock(&ifmgd->mtx);
1255 }
1256
1257 void ieee80211_beacon_loss_work(struct work_struct *work)
1258 {
1259         struct ieee80211_sub_if_data *sdata =
1260                 container_of(work, struct ieee80211_sub_if_data,
1261                              u.mgd.beacon_loss_work);
1262
1263         ieee80211_mgd_probe_ap(sdata, true);
1264 }
1265
1266 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1267 {
1268         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1269
1270         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1271 }
1272 EXPORT_SYMBOL(ieee80211_beacon_loss);
1273
1274 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1275                                      struct ieee80211_mgd_work *wk)
1276 {
1277         wk->state = IEEE80211_MGD_STATE_IDLE;
1278         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1279 }
1280
1281
1282 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1283                                      struct ieee80211_mgd_work *wk,
1284                                      struct ieee80211_mgmt *mgmt,
1285                                      size_t len)
1286 {
1287         u8 *pos;
1288         struct ieee802_11_elems elems;
1289
1290         pos = mgmt->u.auth.variable;
1291         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1292         if (!elems.challenge)
1293                 return;
1294         ieee80211_send_auth(sdata, 3, wk->auth_alg,
1295                             elems.challenge - 2, elems.challenge_len + 2,
1296                             wk->bss->cbss.bssid,
1297                             wk->key, wk->key_len, wk->key_idx);
1298         wk->auth_transaction = 4;
1299 }
1300
1301 static enum rx_mgmt_action __must_check
1302 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1303                        struct ieee80211_mgd_work *wk,
1304                        struct ieee80211_mgmt *mgmt, size_t len)
1305 {
1306         u16 auth_alg, auth_transaction, status_code;
1307
1308         if (wk->state != IEEE80211_MGD_STATE_AUTH)
1309                 return RX_MGMT_NONE;
1310
1311         if (len < 24 + 6)
1312                 return RX_MGMT_NONE;
1313
1314         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1315                 return RX_MGMT_NONE;
1316
1317         if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1318                 return RX_MGMT_NONE;
1319
1320         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1321         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1322         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1323
1324         if (auth_alg != wk->auth_alg ||
1325             auth_transaction != wk->auth_transaction)
1326                 return RX_MGMT_NONE;
1327
1328         if (status_code != WLAN_STATUS_SUCCESS) {
1329                 list_del(&wk->list);
1330                 kfree(wk);
1331                 return RX_MGMT_CFG80211_AUTH;
1332         }
1333
1334         switch (wk->auth_alg) {
1335         case WLAN_AUTH_OPEN:
1336         case WLAN_AUTH_LEAP:
1337         case WLAN_AUTH_FT:
1338                 ieee80211_auth_completed(sdata, wk);
1339                 return RX_MGMT_CFG80211_AUTH;
1340         case WLAN_AUTH_SHARED_KEY:
1341                 if (wk->auth_transaction == 4) {
1342                         ieee80211_auth_completed(sdata, wk);
1343                         return RX_MGMT_CFG80211_AUTH;
1344                 } else
1345                         ieee80211_auth_challenge(sdata, wk, mgmt, len);
1346                 break;
1347         }
1348
1349         return RX_MGMT_NONE;
1350 }
1351
1352
1353 static enum rx_mgmt_action __must_check
1354 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1355                          struct ieee80211_mgd_work *wk,
1356                          struct ieee80211_mgmt *mgmt, size_t len)
1357 {
1358         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1359         const u8 *bssid = NULL;
1360         u16 reason_code;
1361
1362         if (len < 24 + 2)
1363                 return RX_MGMT_NONE;
1364
1365         ASSERT_MGD_MTX(ifmgd);
1366
1367         if (wk)
1368                 bssid = wk->bss->cbss.bssid;
1369         else
1370                 bssid = ifmgd->associated->cbss.bssid;
1371
1372         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1373
1374         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1375                         sdata->dev->name, bssid, reason_code);
1376
1377         if (!wk) {
1378                 ieee80211_set_disassoc(sdata, true);
1379         } else {
1380                 list_del(&wk->list);
1381                 kfree(wk);
1382         }
1383
1384         return RX_MGMT_CFG80211_DEAUTH;
1385 }
1386
1387
1388 static enum rx_mgmt_action __must_check
1389 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1390                            struct ieee80211_mgmt *mgmt, size_t len)
1391 {
1392         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1393         u16 reason_code;
1394
1395         if (len < 24 + 2)
1396                 return RX_MGMT_NONE;
1397
1398         ASSERT_MGD_MTX(ifmgd);
1399
1400         if (WARN_ON(!ifmgd->associated))
1401                 return RX_MGMT_NONE;
1402
1403         if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1404                 return RX_MGMT_NONE;
1405
1406         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1407
1408         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1409                         sdata->dev->name, mgmt->sa, reason_code);
1410
1411         ieee80211_set_disassoc(sdata, false);
1412         return RX_MGMT_CFG80211_DISASSOC;
1413 }
1414
1415
1416 static enum rx_mgmt_action __must_check
1417 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1418                              struct ieee80211_mgd_work *wk,
1419                              struct ieee80211_mgmt *mgmt, size_t len,
1420                              bool reassoc)
1421 {
1422         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1423         struct ieee80211_local *local = sdata->local;
1424         struct ieee80211_supported_band *sband;
1425         struct sta_info *sta;
1426         u32 rates, basic_rates;
1427         u16 capab_info, status_code, aid;
1428         struct ieee802_11_elems elems;
1429         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1430         u8 *pos;
1431         u32 changed = 0;
1432         int i, j;
1433         bool have_higher_than_11mbit = false, newsta = false;
1434         u16 ap_ht_cap_flags;
1435
1436         /*
1437          * AssocResp and ReassocResp have identical structure, so process both
1438          * of them in this function.
1439          */
1440
1441         if (len < 24 + 6)
1442                 return RX_MGMT_NONE;
1443
1444         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1445                 return RX_MGMT_NONE;
1446
1447         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1448         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1449         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1450
1451         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1452                "status=%d aid=%d)\n",
1453                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1454                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1455
1456         pos = mgmt->u.assoc_resp.variable;
1457         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1458
1459         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1460             elems.timeout_int && elems.timeout_int_len == 5 &&
1461             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1462                 u32 tu, ms;
1463                 tu = get_unaligned_le32(elems.timeout_int + 1);
1464                 ms = tu * 1024 / 1000;
1465                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1466                        "comeback duration %u TU (%u ms)\n",
1467                        sdata->dev->name, tu, ms);
1468                 wk->timeout = jiffies + msecs_to_jiffies(ms);
1469                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1470                         run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
1471                 return RX_MGMT_NONE;
1472         }
1473
1474         if (status_code != WLAN_STATUS_SUCCESS) {
1475                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1476                        sdata->dev->name, status_code);
1477                 wk->state = IEEE80211_MGD_STATE_IDLE;
1478                 return RX_MGMT_CFG80211_ASSOC;
1479         }
1480
1481         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1482                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1483                        "set\n", sdata->dev->name, aid);
1484         aid &= ~(BIT(15) | BIT(14));
1485
1486         if (!elems.supp_rates) {
1487                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1488                        sdata->dev->name);
1489                 return RX_MGMT_NONE;
1490         }
1491
1492         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1493         ifmgd->aid = aid;
1494
1495         rcu_read_lock();
1496
1497         /* Add STA entry for the AP */
1498         sta = sta_info_get(local, wk->bss->cbss.bssid);
1499         if (!sta) {
1500                 newsta = true;
1501
1502                 rcu_read_unlock();
1503
1504                 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1505                 if (!sta) {
1506                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1507                                " the AP\n", sdata->dev->name);
1508                         return RX_MGMT_NONE;
1509                 }
1510
1511                 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1512                                    WLAN_STA_ASSOC_AP);
1513                 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1514                         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1515
1516                 rcu_read_lock();
1517         }
1518
1519         rates = 0;
1520         basic_rates = 0;
1521         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1522
1523         for (i = 0; i < elems.supp_rates_len; i++) {
1524                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1525                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1526
1527                 if (rate > 110)
1528                         have_higher_than_11mbit = true;
1529
1530                 for (j = 0; j < sband->n_bitrates; j++) {
1531                         if (sband->bitrates[j].bitrate == rate) {
1532                                 rates |= BIT(j);
1533                                 if (is_basic)
1534                                         basic_rates |= BIT(j);
1535                                 break;
1536                         }
1537                 }
1538         }
1539
1540         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1541                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1542                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1543
1544                 if (rate > 110)
1545                         have_higher_than_11mbit = true;
1546
1547                 for (j = 0; j < sband->n_bitrates; j++) {
1548                         if (sband->bitrates[j].bitrate == rate) {
1549                                 rates |= BIT(j);
1550                                 if (is_basic)
1551                                         basic_rates |= BIT(j);
1552                                 break;
1553                         }
1554                 }
1555         }
1556
1557         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1558         sdata->vif.bss_conf.basic_rates = basic_rates;
1559
1560         /* cf. IEEE 802.11 9.2.12 */
1561         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1562             have_higher_than_11mbit)
1563                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1564         else
1565                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1566
1567         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1568                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1569                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1570
1571         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1572
1573         rate_control_rate_init(sta);
1574
1575         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1576                 set_sta_flags(sta, WLAN_STA_MFP);
1577
1578         if (elems.wmm_param)
1579                 set_sta_flags(sta, WLAN_STA_WME);
1580
1581         if (newsta) {
1582                 int err = sta_info_insert(sta);
1583                 if (err) {
1584                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1585                                " the AP (error %d)\n", sdata->dev->name, err);
1586                         rcu_read_unlock();
1587                         return RX_MGMT_NONE;
1588                 }
1589         }
1590
1591         rcu_read_unlock();
1592
1593         if (elems.wmm_param)
1594                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1595                                          elems.wmm_param_len);
1596         else
1597                 ieee80211_set_wmm_default(sdata);
1598
1599         if (elems.ht_info_elem && elems.wmm_param &&
1600             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1601             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1602                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1603                                                wk->bss->cbss.bssid,
1604                                                ap_ht_cap_flags);
1605
1606         /* delete work item -- must be before set_associated for PS */
1607         list_del(&wk->list);
1608
1609         /* set AID and assoc capability,
1610          * ieee80211_set_associated() will tell the driver */
1611         bss_conf->aid = aid;
1612         bss_conf->assoc_capability = capab_info;
1613         /* this will take ownership of wk */
1614         ieee80211_set_associated(sdata, wk, changed);
1615
1616         /*
1617          * Start timer to probe the connection to the AP now.
1618          * Also start the timer that will detect beacon loss.
1619          */
1620         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1621         mod_beacon_timer(sdata);
1622
1623         return RX_MGMT_CFG80211_ASSOC;
1624 }
1625
1626
1627 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1628                                   struct ieee80211_mgmt *mgmt,
1629                                   size_t len,
1630                                   struct ieee80211_rx_status *rx_status,
1631                                   struct ieee802_11_elems *elems,
1632                                   bool beacon)
1633 {
1634         struct ieee80211_local *local = sdata->local;
1635         int freq;
1636         struct ieee80211_bss *bss;
1637         struct ieee80211_channel *channel;
1638
1639         if (elems->ds_params && elems->ds_params_len == 1)
1640                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1641         else
1642                 freq = rx_status->freq;
1643
1644         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1645
1646         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1647                 return;
1648
1649         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1650                                         channel, beacon);
1651         if (bss)
1652                 ieee80211_rx_bss_put(local, bss);
1653
1654         if (!sdata->u.mgd.associated)
1655                 return;
1656
1657         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1658             (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1659                                                         ETH_ALEN) == 0)) {
1660                 struct ieee80211_channel_sw_ie *sw_elem =
1661                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1662                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1663         }
1664 }
1665
1666
1667 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1668                                          struct ieee80211_mgd_work *wk,
1669                                          struct ieee80211_mgmt *mgmt, size_t len,
1670                                          struct ieee80211_rx_status *rx_status)
1671 {
1672         struct ieee80211_if_managed *ifmgd;
1673         size_t baselen;
1674         struct ieee802_11_elems elems;
1675
1676         ifmgd = &sdata->u.mgd;
1677
1678         ASSERT_MGD_MTX(ifmgd);
1679
1680         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1681                 return; /* ignore ProbeResp to foreign address */
1682
1683         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1684         if (baselen > len)
1685                 return;
1686
1687         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1688                                 &elems);
1689
1690         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1691
1692         /* direct probe may be part of the association flow */
1693         if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1694                 printk(KERN_DEBUG "%s: direct probe responded\n",
1695                        sdata->dev->name);
1696                 wk->tries = 0;
1697                 wk->state = IEEE80211_MGD_STATE_AUTH;
1698                 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1699         }
1700
1701         if (ifmgd->associated &&
1702             memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1703             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1704                             IEEE80211_STA_CONNECTION_POLL)) {
1705                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1706                                   IEEE80211_STA_BEACON_POLL);
1707                 mutex_lock(&sdata->local->iflist_mtx);
1708                 ieee80211_recalc_ps(sdata->local, -1);
1709                 mutex_unlock(&sdata->local->iflist_mtx);
1710                 /*
1711                  * We've received a probe response, but are not sure whether
1712                  * we have or will be receiving any beacons or data, so let's
1713                  * schedule the timers again, just in case.
1714                  */
1715                 mod_beacon_timer(sdata);
1716                 mod_timer(&ifmgd->conn_mon_timer,
1717                           round_jiffies_up(jiffies +
1718                                            IEEE80211_CONNECTION_IDLE_TIME));
1719         }
1720 }
1721
1722 /*
1723  * This is the canonical list of information elements we care about,
1724  * the filter code also gives us all changes to the Microsoft OUI
1725  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1726  *
1727  * We implement beacon filtering in software since that means we can
1728  * avoid processing the frame here and in cfg80211, and userspace
1729  * will not be able to tell whether the hardware supports it or not.
1730  *
1731  * XXX: This list needs to be dynamic -- userspace needs to be able to
1732  *      add items it requires. It also needs to be able to tell us to
1733  *      look out for other vendor IEs.
1734  */
1735 static const u64 care_about_ies =
1736         (1ULL << WLAN_EID_COUNTRY) |
1737         (1ULL << WLAN_EID_ERP_INFO) |
1738         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1739         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1740         (1ULL << WLAN_EID_HT_CAPABILITY) |
1741         (1ULL << WLAN_EID_HT_INFORMATION);
1742
1743 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1744                                      struct ieee80211_mgmt *mgmt,
1745                                      size_t len,
1746                                      struct ieee80211_rx_status *rx_status)
1747 {
1748         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1749         size_t baselen;
1750         struct ieee802_11_elems elems;
1751         struct ieee80211_local *local = sdata->local;
1752         u32 changed = 0;
1753         bool erp_valid, directed_tim = false;
1754         u8 erp_value = 0;
1755         u32 ncrc;
1756         u8 *bssid;
1757
1758         ASSERT_MGD_MTX(ifmgd);
1759
1760         /* Process beacon from the current BSS */
1761         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1762         if (baselen > len)
1763                 return;
1764
1765         if (rx_status->freq != local->hw.conf.channel->center_freq)
1766                 return;
1767
1768         /*
1769          * We might have received a number of frames, among them a
1770          * disassoc frame and a beacon...
1771          */
1772         if (!ifmgd->associated)
1773                 return;
1774
1775         bssid = ifmgd->associated->cbss.bssid;
1776
1777         /*
1778          * And in theory even frames from a different AP we were just
1779          * associated to a split-second ago!
1780          */
1781         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1782                 return;
1783
1784         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1785 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1786                 if (net_ratelimit()) {
1787                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1788                                "to a received beacon\n", sdata->dev->name);
1789                 }
1790 #endif
1791                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1792                 mutex_lock(&local->iflist_mtx);
1793                 ieee80211_recalc_ps(local, -1);
1794                 mutex_unlock(&local->iflist_mtx);
1795         }
1796
1797         /*
1798          * Push the beacon loss detection into the future since
1799          * we are processing a beacon from the AP just now.
1800          */
1801         mod_beacon_timer(sdata);
1802
1803         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1804         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1805                                           len - baselen, &elems,
1806                                           care_about_ies, ncrc);
1807
1808         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1809                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1810                                                    ifmgd->aid);
1811
1812         if (ncrc != ifmgd->beacon_crc) {
1813                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1814                                       true);
1815
1816                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1817                                          elems.wmm_param_len);
1818         }
1819
1820         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1821                 if (directed_tim) {
1822                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1823                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1824                                 ieee80211_hw_config(local,
1825                                                     IEEE80211_CONF_CHANGE_PS);
1826                                 ieee80211_send_nullfunc(local, sdata, 0);
1827                         } else {
1828                                 local->pspolling = true;
1829
1830                                 /*
1831                                  * Here is assumed that the driver will be
1832                                  * able to send ps-poll frame and receive a
1833                                  * response even though power save mode is
1834                                  * enabled, but some drivers might require
1835                                  * to disable power save here. This needs
1836                                  * to be investigated.
1837                                  */
1838                                 ieee80211_send_pspoll(local, sdata);
1839                         }
1840                 }
1841         }
1842
1843         if (ncrc == ifmgd->beacon_crc)
1844                 return;
1845         ifmgd->beacon_crc = ncrc;
1846
1847         if (elems.erp_info && elems.erp_info_len >= 1) {
1848                 erp_valid = true;
1849                 erp_value = elems.erp_info[0];
1850         } else {
1851                 erp_valid = false;
1852         }
1853         changed |= ieee80211_handle_bss_capability(sdata,
1854                         le16_to_cpu(mgmt->u.beacon.capab_info),
1855                         erp_valid, erp_value);
1856
1857
1858         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1859             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1860                 struct sta_info *sta;
1861                 struct ieee80211_supported_band *sband;
1862                 u16 ap_ht_cap_flags;
1863
1864                 rcu_read_lock();
1865
1866                 sta = sta_info_get(local, bssid);
1867                 if (WARN_ON(!sta)) {
1868                         rcu_read_unlock();
1869                         return;
1870                 }
1871
1872                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1873
1874                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1875                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1876
1877                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1878
1879                 rcu_read_unlock();
1880
1881                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1882                                                bssid, ap_ht_cap_flags);
1883         }
1884
1885         /* Note: country IE parsing is done for us by cfg80211 */
1886         if (elems.country_elem) {
1887                 /* TODO: IBSS also needs this */
1888                 if (elems.pwr_constr_elem)
1889                         ieee80211_handle_pwr_constr(sdata,
1890                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1891                                 elems.pwr_constr_elem,
1892                                 elems.pwr_constr_elem_len);
1893         }
1894
1895         ieee80211_bss_info_change_notify(sdata, changed);
1896 }
1897
1898 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1899                                           struct sk_buff *skb)
1900 {
1901         struct ieee80211_local *local = sdata->local;
1902         struct ieee80211_mgmt *mgmt;
1903         u16 fc;
1904
1905         if (skb->len < 24)
1906                 return RX_DROP_MONITOR;
1907
1908         mgmt = (struct ieee80211_mgmt *) skb->data;
1909         fc = le16_to_cpu(mgmt->frame_control);
1910
1911         switch (fc & IEEE80211_FCTL_STYPE) {
1912         case IEEE80211_STYPE_PROBE_REQ:
1913         case IEEE80211_STYPE_PROBE_RESP:
1914         case IEEE80211_STYPE_BEACON:
1915         case IEEE80211_STYPE_AUTH:
1916         case IEEE80211_STYPE_ASSOC_RESP:
1917         case IEEE80211_STYPE_REASSOC_RESP:
1918         case IEEE80211_STYPE_DEAUTH:
1919         case IEEE80211_STYPE_DISASSOC:
1920         case IEEE80211_STYPE_ACTION:
1921                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1922                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1923                 return RX_QUEUED;
1924         }
1925
1926         return RX_DROP_MONITOR;
1927 }
1928
1929 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1930                                          struct sk_buff *skb)
1931 {
1932         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1933         struct ieee80211_rx_status *rx_status;
1934         struct ieee80211_mgmt *mgmt;
1935         struct ieee80211_mgd_work *wk;
1936         enum rx_mgmt_action rma = RX_MGMT_NONE;
1937         u16 fc;
1938
1939         rx_status = (struct ieee80211_rx_status *) skb->cb;
1940         mgmt = (struct ieee80211_mgmt *) skb->data;
1941         fc = le16_to_cpu(mgmt->frame_control);
1942
1943         mutex_lock(&ifmgd->mtx);
1944
1945         if (ifmgd->associated &&
1946             memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1947                                                         ETH_ALEN) == 0) {
1948                 switch (fc & IEEE80211_FCTL_STYPE) {
1949                 case IEEE80211_STYPE_BEACON:
1950                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1951                                                  rx_status);
1952                         break;
1953                 case IEEE80211_STYPE_PROBE_RESP:
1954                         ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1955                                                      skb->len, rx_status);
1956                         break;
1957                 case IEEE80211_STYPE_DEAUTH:
1958                         rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1959                                                        mgmt, skb->len);
1960                         break;
1961                 case IEEE80211_STYPE_DISASSOC:
1962                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1963                         break;
1964                 case IEEE80211_STYPE_ACTION:
1965                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1966                                 break;
1967
1968                         ieee80211_sta_process_chanswitch(sdata,
1969                                         &mgmt->u.action.u.chan_switch.sw_elem,
1970                                         ifmgd->associated);
1971                         break;
1972                 }
1973                 mutex_unlock(&ifmgd->mtx);
1974
1975                 switch (rma) {
1976                 case RX_MGMT_NONE:
1977                         /* no action */
1978                         break;
1979                 case RX_MGMT_CFG80211_DEAUTH:
1980                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len,
1981                                              NULL);
1982                         break;
1983                 case RX_MGMT_CFG80211_DISASSOC:
1984                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len,
1985                                                NULL);
1986                         break;
1987                 default:
1988                         WARN(1, "unexpected: %d", rma);
1989                 }
1990                 goto out;
1991         }
1992
1993         list_for_each_entry(wk, &ifmgd->work_list, list) {
1994                 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1995                         continue;
1996
1997                 switch (fc & IEEE80211_FCTL_STYPE) {
1998                 case IEEE80211_STYPE_PROBE_RESP:
1999                         ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
2000                                                      rx_status);
2001                         break;
2002                 case IEEE80211_STYPE_AUTH:
2003                         rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
2004                         break;
2005                 case IEEE80211_STYPE_ASSOC_RESP:
2006                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2007                                                            skb->len, false);
2008                         break;
2009                 case IEEE80211_STYPE_REASSOC_RESP:
2010                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2011                                                            skb->len, true);
2012                         break;
2013                 case IEEE80211_STYPE_DEAUTH:
2014                         rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
2015                                                        skb->len);
2016                         break;
2017                 }
2018                 /*
2019                  * We've processed this frame for that work, so it can't
2020                  * belong to another work struct.
2021                  * NB: this is also required for correctness because the
2022                  * called functions can free 'wk', and for 'rma'!
2023                  */
2024                 break;
2025         }
2026
2027         mutex_unlock(&ifmgd->mtx);
2028
2029         switch (rma) {
2030         case RX_MGMT_NONE:
2031                 /* no action */
2032                 break;
2033         case RX_MGMT_CFG80211_AUTH:
2034                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
2035                 break;
2036         case RX_MGMT_CFG80211_ASSOC:
2037                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
2038                 break;
2039         case RX_MGMT_CFG80211_DEAUTH:
2040                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len, NULL);
2041                 break;
2042         default:
2043                 WARN(1, "unexpected: %d", rma);
2044         }
2045
2046  out:
2047         kfree_skb(skb);
2048 }
2049
2050 static void ieee80211_sta_timer(unsigned long data)
2051 {
2052         struct ieee80211_sub_if_data *sdata =
2053                 (struct ieee80211_sub_if_data *) data;
2054         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2055         struct ieee80211_local *local = sdata->local;
2056
2057         if (local->quiescing) {
2058                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2059                 return;
2060         }
2061
2062         ieee80211_queue_work(&local->hw, &ifmgd->work);
2063 }
2064
2065 static void ieee80211_sta_work(struct work_struct *work)
2066 {
2067         struct ieee80211_sub_if_data *sdata =
2068                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2069         struct ieee80211_local *local = sdata->local;
2070         struct ieee80211_if_managed *ifmgd;
2071         struct sk_buff *skb;
2072         struct ieee80211_mgd_work *wk, *tmp;
2073         LIST_HEAD(free_work);
2074         enum rx_mgmt_action rma;
2075         bool anybusy = false;
2076
2077         if (!netif_running(sdata->dev))
2078                 return;
2079
2080         if (local->scanning)
2081                 return;
2082
2083         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2084                 return;
2085
2086         /*
2087          * ieee80211_queue_work() should have picked up most cases,
2088          * here we'll pick the the rest.
2089          */
2090         if (WARN(local->suspended, "STA MLME work scheduled while "
2091                  "going to suspend\n"))
2092                 return;
2093
2094         ifmgd = &sdata->u.mgd;
2095
2096         /* first process frames to avoid timing out while a frame is pending */
2097         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2098                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2099
2100         /* then process the rest of the work */
2101         mutex_lock(&ifmgd->mtx);
2102
2103         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2104                             IEEE80211_STA_CONNECTION_POLL) &&
2105             ifmgd->associated) {
2106                 u8 bssid[ETH_ALEN];
2107
2108                 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
2109                 if (time_is_after_jiffies(ifmgd->probe_timeout))
2110                         run_again(ifmgd, ifmgd->probe_timeout);
2111
2112                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
2113 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2114                         printk(KERN_DEBUG "No probe response from AP %pM"
2115                                 " after %dms, try %d\n", bssid,
2116                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
2117                                 ifmgd->probe_send_count);
2118 #endif
2119                         ieee80211_mgd_probe_ap_send(sdata);
2120                 } else {
2121                         /*
2122                          * We actually lost the connection ... or did we?
2123                          * Let's make sure!
2124                          */
2125                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2126                                           IEEE80211_STA_BEACON_POLL);
2127                         printk(KERN_DEBUG "No probe response from AP %pM"
2128                                 " after %dms, disconnecting.\n",
2129                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2130                         ieee80211_set_disassoc(sdata, true);
2131                         mutex_unlock(&ifmgd->mtx);
2132                         /*
2133                          * must be outside lock due to cfg80211,
2134                          * but that's not a problem.
2135                          */
2136                         ieee80211_send_deauth_disassoc(sdata, bssid,
2137                                         IEEE80211_STYPE_DEAUTH,
2138                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2139                                         NULL);
2140                         mutex_lock(&ifmgd->mtx);
2141                 }
2142         }
2143
2144
2145         ieee80211_recalc_idle(local);
2146
2147         list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
2148                 if (time_is_after_jiffies(wk->timeout)) {
2149                         /*
2150                          * This work item isn't supposed to be worked on
2151                          * right now, but take care to adjust the timer
2152                          * properly.
2153                          */
2154                         run_again(ifmgd, wk->timeout);
2155                         continue;
2156                 }
2157
2158                 switch (wk->state) {
2159                 default:
2160                         WARN_ON(1);
2161                         /* fall through */
2162                 case IEEE80211_MGD_STATE_IDLE:
2163                         /* nothing */
2164                         rma = RX_MGMT_NONE;
2165                         break;
2166                 case IEEE80211_MGD_STATE_PROBE:
2167                         rma = ieee80211_direct_probe(sdata, wk);
2168                         break;
2169                 case IEEE80211_MGD_STATE_AUTH:
2170                         rma = ieee80211_authenticate(sdata, wk);
2171                         break;
2172                 case IEEE80211_MGD_STATE_ASSOC:
2173                         rma = ieee80211_associate(sdata, wk);
2174                         break;
2175                 }
2176
2177                 switch (rma) {
2178                 case RX_MGMT_NONE:
2179                         /* no action required */
2180                         break;
2181                 case RX_MGMT_CFG80211_AUTH_TO:
2182                 case RX_MGMT_CFG80211_ASSOC_TO:
2183                         list_del(&wk->list);
2184                         list_add(&wk->list, &free_work);
2185                         wk->tries = rma; /* small abuse but only local */
2186                         break;
2187                 default:
2188                         WARN(1, "unexpected: %d", rma);
2189                 }
2190         }
2191
2192         list_for_each_entry(wk, &ifmgd->work_list, list) {
2193                 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
2194                         anybusy = true;
2195                         break;
2196                 }
2197         }
2198         if (!anybusy &&
2199             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
2200                 ieee80211_queue_delayed_work(&local->hw,
2201                                              &local->scan_work,
2202                                              round_jiffies_relative(0));
2203
2204         mutex_unlock(&ifmgd->mtx);
2205
2206         list_for_each_entry_safe(wk, tmp, &free_work, list) {
2207                 switch (wk->tries) {
2208                 case RX_MGMT_CFG80211_AUTH_TO:
2209                         cfg80211_send_auth_timeout(sdata->dev,
2210                                                    wk->bss->cbss.bssid);
2211                         break;
2212                 case RX_MGMT_CFG80211_ASSOC_TO:
2213                         cfg80211_send_assoc_timeout(sdata->dev,
2214                                                     wk->bss->cbss.bssid);
2215                         break;
2216                 default:
2217                         WARN(1, "unexpected: %d", wk->tries);
2218                 }
2219
2220                 list_del(&wk->list);
2221                 kfree(wk);
2222         }
2223
2224         ieee80211_recalc_idle(local);
2225 }
2226
2227 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2228 {
2229         struct ieee80211_sub_if_data *sdata =
2230                 (struct ieee80211_sub_if_data *) data;
2231         struct ieee80211_local *local = sdata->local;
2232
2233         if (local->quiescing)
2234                 return;
2235
2236         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
2237 }
2238
2239 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2240 {
2241         struct ieee80211_sub_if_data *sdata =
2242                 (struct ieee80211_sub_if_data *) data;
2243         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2244         struct ieee80211_local *local = sdata->local;
2245
2246         if (local->quiescing)
2247                 return;
2248
2249         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2250 }
2251
2252 static void ieee80211_sta_monitor_work(struct work_struct *work)
2253 {
2254         struct ieee80211_sub_if_data *sdata =
2255                 container_of(work, struct ieee80211_sub_if_data,
2256                              u.mgd.monitor_work);
2257
2258         ieee80211_mgd_probe_ap(sdata, false);
2259 }
2260
2261 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2262 {
2263         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2264                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2265                                         IEEE80211_STA_CONNECTION_POLL);
2266
2267                 /* let's probe the connection once */
2268                 ieee80211_queue_work(&sdata->local->hw,
2269                            &sdata->u.mgd.monitor_work);
2270                 /* and do all the other regular work too */
2271                 ieee80211_queue_work(&sdata->local->hw,
2272                            &sdata->u.mgd.work);
2273         }
2274 }
2275
2276 #ifdef CONFIG_PM
2277 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2278 {
2279         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2280
2281         /*
2282          * we need to use atomic bitops for the running bits
2283          * only because both timers might fire at the same
2284          * time -- the code here is properly synchronised.
2285          */
2286
2287         cancel_work_sync(&ifmgd->work);
2288         cancel_work_sync(&ifmgd->beacon_loss_work);
2289         if (del_timer_sync(&ifmgd->timer))
2290                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2291
2292         cancel_work_sync(&ifmgd->chswitch_work);
2293         if (del_timer_sync(&ifmgd->chswitch_timer))
2294                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2295
2296         cancel_work_sync(&ifmgd->monitor_work);
2297         /* these will just be re-established on connection */
2298         del_timer_sync(&ifmgd->conn_mon_timer);
2299         del_timer_sync(&ifmgd->bcn_mon_timer);
2300 }
2301
2302 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2303 {
2304         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2305
2306         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2307                 add_timer(&ifmgd->timer);
2308         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2309                 add_timer(&ifmgd->chswitch_timer);
2310 }
2311 #endif
2312
2313 /* interface setup */
2314 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2315 {
2316         struct ieee80211_if_managed *ifmgd;
2317
2318         ifmgd = &sdata->u.mgd;
2319         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2320         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2321         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2322         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2323         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2324                     (unsigned long) sdata);
2325         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2326                     (unsigned long) sdata);
2327         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2328                     (unsigned long) sdata);
2329         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2330                     (unsigned long) sdata);
2331         skb_queue_head_init(&ifmgd->skb_queue);
2332
2333         INIT_LIST_HEAD(&ifmgd->work_list);
2334
2335         ifmgd->capab = WLAN_CAPABILITY_ESS;
2336         ifmgd->flags = 0;
2337         if (sdata->local->hw.queues >= 4)
2338                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2339
2340         mutex_init(&ifmgd->mtx);
2341 }
2342
2343 /* scan finished notification */
2344 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2345 {
2346         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2347
2348         /* Restart STA timers */
2349         rcu_read_lock();
2350         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2351                 ieee80211_restart_sta_timer(sdata);
2352         rcu_read_unlock();
2353 }
2354
2355 int ieee80211_max_network_latency(struct notifier_block *nb,
2356                                   unsigned long data, void *dummy)
2357 {
2358         s32 latency_usec = (s32) data;
2359         struct ieee80211_local *local =
2360                 container_of(nb, struct ieee80211_local,
2361                              network_latency_notifier);
2362
2363         mutex_lock(&local->iflist_mtx);
2364         ieee80211_recalc_ps(local, latency_usec);
2365         mutex_unlock(&local->iflist_mtx);
2366
2367         return 0;
2368 }
2369
2370 /* config hooks */
2371 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2372                        struct cfg80211_auth_request *req)
2373 {
2374         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2375         const u8 *ssid;
2376         struct ieee80211_mgd_work *wk;
2377         u16 auth_alg;
2378
2379         switch (req->auth_type) {
2380         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2381                 auth_alg = WLAN_AUTH_OPEN;
2382                 break;
2383         case NL80211_AUTHTYPE_SHARED_KEY:
2384                 auth_alg = WLAN_AUTH_SHARED_KEY;
2385                 break;
2386         case NL80211_AUTHTYPE_FT:
2387                 auth_alg = WLAN_AUTH_FT;
2388                 break;
2389         case NL80211_AUTHTYPE_NETWORK_EAP:
2390                 auth_alg = WLAN_AUTH_LEAP;
2391                 break;
2392         default:
2393                 return -EOPNOTSUPP;
2394         }
2395
2396         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2397         if (!wk)
2398                 return -ENOMEM;
2399
2400         wk->bss = (void *)req->bss;
2401
2402         if (req->ie && req->ie_len) {
2403                 memcpy(wk->ie, req->ie, req->ie_len);
2404                 wk->ie_len = req->ie_len;
2405         }
2406
2407         if (req->key && req->key_len) {
2408                 wk->key_len = req->key_len;
2409                 wk->key_idx = req->key_idx;
2410                 memcpy(wk->key, req->key, req->key_len);
2411         }
2412
2413         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2414         memcpy(wk->ssid, ssid + 2, ssid[1]);
2415         wk->ssid_len = ssid[1];
2416
2417         wk->state = IEEE80211_MGD_STATE_PROBE;
2418         wk->auth_alg = auth_alg;
2419         wk->timeout = jiffies; /* run right away */
2420
2421         /*
2422          * XXX: if still associated need to tell AP that we're going
2423          *      to sleep and then change channel etc.
2424          */
2425         sdata->local->oper_channel = req->bss->channel;
2426         ieee80211_hw_config(sdata->local, 0);
2427
2428         mutex_lock(&ifmgd->mtx);
2429         list_add(&wk->list, &sdata->u.mgd.work_list);
2430         mutex_unlock(&ifmgd->mtx);
2431
2432         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2433         return 0;
2434 }
2435
2436 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2437                         struct cfg80211_assoc_request *req)
2438 {
2439         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2440         struct ieee80211_mgd_work *wk, *found = NULL;
2441         int i, err;
2442
2443         mutex_lock(&ifmgd->mtx);
2444
2445         list_for_each_entry(wk, &ifmgd->work_list, list) {
2446                 if (&wk->bss->cbss == req->bss &&
2447                     wk->state == IEEE80211_MGD_STATE_IDLE) {
2448                         found = wk;
2449                         break;
2450                 }
2451         }
2452
2453         if (!found) {
2454                 err = -ENOLINK;
2455                 goto out;
2456         }
2457
2458         list_del(&found->list);
2459
2460         wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2461         if (!wk) {
2462                 list_add(&found->list, &ifmgd->work_list);
2463                 err = -ENOMEM;
2464                 goto out;
2465         }
2466
2467         list_add(&wk->list, &ifmgd->work_list);
2468
2469         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2470         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2471
2472         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2473                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2474                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2475                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2476                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2477
2478         sdata->local->oper_channel = req->bss->channel;
2479         ieee80211_hw_config(sdata->local, 0);
2480
2481         if (req->ie && req->ie_len) {
2482                 memcpy(wk->ie, req->ie, req->ie_len);
2483                 wk->ie_len = req->ie_len;
2484         } else
2485                 wk->ie_len = 0;
2486
2487         if (req->prev_bssid)
2488                 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2489
2490         wk->state = IEEE80211_MGD_STATE_ASSOC;
2491         wk->tries = 0;
2492         wk->timeout = jiffies; /* run right away */
2493
2494         if (req->use_mfp) {
2495                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2496                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2497         } else {
2498                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2499                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2500         }
2501
2502         if (req->crypto.control_port)
2503                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2504         else
2505                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2506
2507         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2508
2509         err = 0;
2510
2511  out:
2512         mutex_unlock(&ifmgd->mtx);
2513         return err;
2514 }
2515
2516 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2517                          struct cfg80211_deauth_request *req,
2518                          void *cookie)
2519 {
2520         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2521         struct ieee80211_mgd_work *wk;
2522         const u8 *bssid = NULL;
2523
2524         mutex_lock(&ifmgd->mtx);
2525
2526         if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2527                 bssid = req->bss->bssid;
2528                 ieee80211_set_disassoc(sdata, true);
2529         } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2530                 if (&wk->bss->cbss == req->bss) {
2531                         bssid = req->bss->bssid;
2532                         list_del(&wk->list);
2533                         kfree(wk);
2534                         break;
2535                 }
2536         }
2537
2538         /*
2539          * cfg80211 should catch this ... but it's racy since
2540          * we can receive a deauth frame, process it, hand it
2541          * to cfg80211 while that's in a locked section already
2542          * trying to tell us that the user wants to disconnect.
2543          */
2544         if (!bssid) {
2545                 mutex_unlock(&ifmgd->mtx);
2546                 return -ENOLINK;
2547         }
2548
2549         mutex_unlock(&ifmgd->mtx);
2550
2551         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2552                sdata->dev->name, bssid, req->reason_code);
2553
2554         ieee80211_send_deauth_disassoc(sdata, bssid,
2555                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2556                         cookie);
2557
2558         return 0;
2559 }
2560
2561 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2562                            struct cfg80211_disassoc_request *req,
2563                            void *cookie)
2564 {
2565         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2566
2567         mutex_lock(&ifmgd->mtx);
2568
2569         /*
2570          * cfg80211 should catch this ... but it's racy since
2571          * we can receive a disassoc frame, process it, hand it
2572          * to cfg80211 while that's in a locked section already
2573          * trying to tell us that the user wants to disconnect.
2574          */
2575         if (&ifmgd->associated->cbss != req->bss) {
2576                 mutex_unlock(&ifmgd->mtx);
2577                 return -ENOLINK;
2578         }
2579
2580         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2581                sdata->dev->name, req->bss->bssid, req->reason_code);
2582
2583         ieee80211_set_disassoc(sdata, false);
2584
2585         mutex_unlock(&ifmgd->mtx);
2586
2587         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2588                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2589                         cookie);
2590         return 0;
2591 }