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_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 430         ieee80211_tx_skb(sdata, skb);
 431 }
 432
 433
 434 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 435                                            const u8 *bssid, u16 stype, u16 reason,
 436                                            void *cookie)
 437 {
 438         struct ieee80211_local *local = sdata->local;
 439         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 440         struct sk_buff *skb;
 441         struct ieee80211_mgmt *mgmt;
 442
 443         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 444         if (!skb) {
 445                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 446                        "deauth/disassoc frame\n", sdata->dev->name);
 447                 return;
 448         }
 449         skb_reserve(skb, local->hw.extra_tx_headroom);
 450
 451         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 452         memset(mgmt, 0, 24);
 453         memcpy(mgmt->da, bssid, ETH_ALEN);
 454         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 455         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 456         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 457         skb_put(skb, 2);
 458         /* u.deauth.reason_code == u.disassoc.reason_code */
 459         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 460
 461         if (stype == IEEE80211_STYPE_DEAUTH)
 462                 if (cookie)
 463                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 464                 else
 465                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 466         else
 467                 if (cookie)
 468                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 469                 else
 470                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 471         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 472                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 473         ieee80211_tx_skb(sdata, skb);
 474 }
 475
 476 void ieee80211_send_pspoll(struct ieee80211_local *local,
 477                            struct ieee80211_sub_if_data *sdata)
 478 {
 479         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 480         struct ieee80211_pspoll *pspoll;
 481         struct sk_buff *skb;
 482         u16 fc;
 483
 484         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 485         if (!skb) {
 486                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 487                        "pspoll frame\n", sdata->dev->name);
 488                 return;
 489         }
 490         skb_reserve(skb, local->hw.extra_tx_headroom);
 491
 492         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 493         memset(pspoll, 0, sizeof(*pspoll));
 494         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 495         pspoll->frame_control = cpu_to_le16(fc);
 496         pspoll->aid = cpu_to_le16(ifmgd->aid);
 497
 498         /* aid in PS-Poll has its two MSBs each set to 1 */
 499         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 500
 501         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 502         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 503
 504         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 505         ieee80211_tx_skb(sdata, skb);
 506 }
 507
 508 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 509                              struct ieee80211_sub_if_data *sdata,
 510                              int powersave)
 511 {
 512         struct sk_buff *skb;
 513         struct ieee80211_hdr *nullfunc;
 514         __le16 fc;
 515
 516         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 517                 return;
 518
 519         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 520         if (!skb) {
 521                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 522                        "frame\n", sdata->dev->name);
 523                 return;
 524         }
 525         skb_reserve(skb, local->hw.extra_tx_headroom);
 526
 527         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 528         memset(nullfunc, 0, 24);
 529         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 530                          IEEE80211_FCTL_TODS);
 531         if (powersave)
 532                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 533         nullfunc->frame_control = fc;
 534         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 535         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 536         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 537
 538         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 539         ieee80211_tx_skb(sdata, skb);
 540 }
 541
 542 /* spectrum management related things */
 543 static void ieee80211_chswitch_work(struct work_struct *work)
 544 {
 545         struct ieee80211_sub_if_data *sdata =
 546                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 547         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 548
 549         if (!netif_running(sdata->dev))
 550                 return;
 551
 552         mutex_lock(&ifmgd->mtx);
 553         if (!ifmgd->associated)
 554                 goto out;
 555
 556         sdata->local->oper_channel = sdata->local->csa_channel;
 557         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 558
 559         /* XXX: shouldn't really modify cfg80211-owned data! */
 560         ifmgd->associated->cbss.channel = sdata->local->oper_channel;
 561
 562         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 563                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 564  out:
 565         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 566         mutex_unlock(&ifmgd->mtx);
 567 }
 568
 569 static void ieee80211_chswitch_timer(unsigned long data)
 570 {
 571         struct ieee80211_sub_if_data *sdata =
 572                 (struct ieee80211_sub_if_data *) data;
 573         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 574
 575         if (sdata->local->quiescing) {
 576                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 577                 return;
 578         }
 579
 580         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 581 }
 582
 583 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 584                                       struct ieee80211_channel_sw_ie *sw_elem,
 585                                       struct ieee80211_bss *bss)
 586 {
 587         struct ieee80211_channel *new_ch;
 588         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 589         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 590
 591         ASSERT_MGD_MTX(ifmgd);
 592
 593         if (!ifmgd->associated)
 594                 return;
 595
 596         if (sdata->local->scanning)
 597                 return;
 598
 599         /* Disregard subsequent beacons if we are already running a timer
 600            processing a CSA */
 601
 602         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 603                 return;
 604
 605         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 606         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 607                 return;
 608
 609         sdata->local->csa_channel = new_ch;
 610
 611         if (sw_elem->count <= 1) {
 612                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 613         } else {
 614                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 615                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 616                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 617                 mod_timer(&ifmgd->chswitch_timer,
 618                           jiffies +
 619                           msecs_to_jiffies(sw_elem->count *
 620                                            bss->cbss.beacon_interval));
 621         }
 622 }
 623
 624 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 625                                         u16 capab_info, u8 *pwr_constr_elem,
 626                                         u8 pwr_constr_elem_len)
 627 {
 628         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 629
 630         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 631                 return;
 632
 633         /* Power constraint IE length should be 1 octet */
 634         if (pwr_constr_elem_len != 1)
 635                 return;
 636
 637         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 638             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 639                 sdata->local->power_constr_level = *pwr_constr_elem;
 640                 ieee80211_hw_config(sdata->local, 0);
 641         }
 642 }
 643
 644 /* powersave */
 645 static void ieee80211_enable_ps(struct ieee80211_local *local,
 646                                 struct ieee80211_sub_if_data *sdata)
 647 {
 648         struct ieee80211_conf *conf = &local->hw.conf;
 649
 650         /*
 651          * If we are scanning right now then the parameters will
 652          * take effect when scan finishes.
 653          */
 654         if (local->scanning)
 655                 return;
 656
 657         if (conf->dynamic_ps_timeout > 0 &&
 658             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 659                 mod_timer(&local->dynamic_ps_timer, jiffies +
 660                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 661         } else {
 662                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 663                         ieee80211_send_nullfunc(local, sdata, 1);
 664                 conf->flags |= IEEE80211_CONF_PS;
 665                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 666         }
 667 }
 668
 669 static void ieee80211_change_ps(struct ieee80211_local *local)
 670 {
 671         struct ieee80211_conf *conf = &local->hw.conf;
 672
 673         if (local->ps_sdata) {
 674                 ieee80211_enable_ps(local, local->ps_sdata);
 675         } else if (conf->flags & IEEE80211_CONF_PS) {
 676                 conf->flags &= ~IEEE80211_CONF_PS;
 677                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 678                 del_timer_sync(&local->dynamic_ps_timer);
 679                 cancel_work_sync(&local->dynamic_ps_enable_work);
 680         }
 681 }
 682
 683 /* need to hold RTNL or interface lock */
 684 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 685 {
 686         struct ieee80211_sub_if_data *sdata, *found = NULL;
 687         int count = 0;
 688
 689         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 690                 local->ps_sdata = NULL;
 691                 return;
 692         }
 693
 694         list_for_each_entry(sdata, &local->interfaces, list) {
 695                 if (!netif_running(sdata->dev))
 696                         continue;
 697                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 698                         continue;
 699                 found = sdata;
 700                 count++;
 701         }
 702
 703         if (count == 1 && found->u.mgd.powersave &&
 704             found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
 705             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 706                                     IEEE80211_STA_CONNECTION_POLL))) {
 707                 s32 beaconint_us;
 708
 709                 if (latency < 0)
 710                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 711
 712                 beaconint_us = ieee80211_tu_to_usec(
 713                                         found->vif.bss_conf.beacon_int);
 714
 715                 if (beaconint_us > latency) {
 716                         local->ps_sdata = NULL;
 717                 } else {
 718                         u8 dtimper = found->vif.bss_conf.dtim_period;
 719                         int maxslp = 1;
 720
 721                         if (dtimper > 1)
 722                                 maxslp = min_t(int, dtimper,
 723                                                     latency / beaconint_us);
 724
 725                         local->hw.conf.max_sleep_period = maxslp;
 726                         local->ps_sdata = found;
 727                 }
 728         } else {
 729                 local->ps_sdata = NULL;
 730         }
 731
 732         ieee80211_change_ps(local);
 733 }
 734
 735 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 736 {
 737         struct ieee80211_local *local =
 738                 container_of(work, struct ieee80211_local,
 739                              dynamic_ps_disable_work);
 740
 741         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 742                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 743                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 744         }
 745
 746         ieee80211_wake_queues_by_reason(&local->hw,
 747                                         IEEE80211_QUEUE_STOP_REASON_PS);
 748 }
 749
 750 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 751 {
 752         struct ieee80211_local *local =
 753                 container_of(work, struct ieee80211_local,
 754                              dynamic_ps_enable_work);
 755         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 756
 757         /* can only happen when PS was just disabled anyway */
 758         if (!sdata)
 759                 return;
 760
 761         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 762                 return;
 763
 764         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 765                 ieee80211_send_nullfunc(local, sdata, 1);
 766
 767         local->hw.conf.flags |= IEEE80211_CONF_PS;
 768         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 769 }
 770
 771 void ieee80211_dynamic_ps_timer(unsigned long data)
 772 {
 773         struct ieee80211_local *local = (void *) data;
 774
 775         if (local->quiescing || local->suspended)
 776                 return;
 777
 778         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 779 }
 780
 781 /* MLME */
 782 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 783                                      struct ieee80211_if_managed *ifmgd,
 784                                      u8 *wmm_param, size_t wmm_param_len)
 785 {
 786         struct ieee80211_tx_queue_params params;
 787         size_t left;
 788         int count;
 789         u8 *pos;
 790
 791         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 792                 return;
 793
 794         if (!wmm_param)
 795                 return;
 796
 797         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 798                 return;
 799         count = wmm_param[6] & 0x0f;
 800         if (count == ifmgd->wmm_last_param_set)
 801                 return;
 802         ifmgd->wmm_last_param_set = count;
 803
 804         pos = wmm_param + 8;
 805         left = wmm_param_len - 8;
 806
 807         memset(&params, 0, sizeof(params));
 808
 809         local->wmm_acm = 0;
 810         for (; left >= 4; left -= 4, pos += 4) {
 811                 int aci = (pos[0] >> 5) & 0x03;
 812                 int acm = (pos[0] >> 4) & 0x01;
 813                 int queue;
 814
 815                 switch (aci) {
 816                 case 1: /* AC_BK */
 817                         queue = 3;
 818                         if (acm)
 819                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 820                         break;
 821                 case 2: /* AC_VI */
 822                         queue = 1;
 823                         if (acm)
 824                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 825                         break;
 826                 case 3: /* AC_VO */
 827                         queue = 0;
 828                         if (acm)
 829                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 830                         break;
 831                 case 0: /* AC_BE */
 832                 default:
 833                         queue = 2;
 834                         if (acm)
 835                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 836                         break;
 837                 }
 838
 839                 params.aifs = pos[0] & 0x0f;
 840                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 841                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 842                 params.txop = get_unaligned_le16(pos + 2);
 843 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 844                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 845                        "cWmin=%d cWmax=%d txop=%d\n",
 846                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 847                        params.aifs, params.cw_min, params.cw_max, params.txop);
 848 #endif
 849                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 850                         printk(KERN_DEBUG "%s: failed to set TX queue "
 851                                "parameters for queue %d\n",
 852                                wiphy_name(local->hw.wiphy), queue);
 853         }
 854 }
 855
 856 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 857                                            u16 capab, bool erp_valid, u8 erp)
 858 {
 859         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 860         u32 changed = 0;
 861         bool use_protection;
 862         bool use_short_preamble;
 863         bool use_short_slot;
 864
 865         if (erp_valid) {
 866                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 867                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 868         } else {
 869                 use_protection = false;
 870                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 871         }
 872
 873         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 874
 875         if (use_protection != bss_conf->use_cts_prot) {
 876                 bss_conf->use_cts_prot = use_protection;
 877                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 878         }
 879
 880         if (use_short_preamble != bss_conf->use_short_preamble) {
 881                 bss_conf->use_short_preamble = use_short_preamble;
 882                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 883         }
 884
 885         if (use_short_slot != bss_conf->use_short_slot) {
 886                 bss_conf->use_short_slot = use_short_slot;
 887                 changed |= BSS_CHANGED_ERP_SLOT;
 888         }
 889
 890         return changed;
 891 }
 892
 893 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 894                                      struct ieee80211_mgd_work *wk,
 895                                      u32 bss_info_changed)
 896 {
 897         struct ieee80211_local *local = sdata->local;
 898         struct ieee80211_bss *bss = wk->bss;
 899
 900         bss_info_changed |= BSS_CHANGED_ASSOC;
 901         /* set timing information */
 902         sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 903         sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 904         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 905
 906         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 907         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 908                 bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 909
 910         sdata->u.mgd.associated = bss;
 911         sdata->u.mgd.old_associate_work = wk;
 912         memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
 913
 914         /* just to be sure */
 915         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 916                                 IEEE80211_STA_BEACON_POLL);
 917
 918         ieee80211_led_assoc(local, 1);
 919
 920         sdata->vif.bss_conf.assoc = 1;
 921         /*
 922          * For now just always ask the driver to update the basic rateset
 923          * when we have associated, we aren't checking whether it actually
 924          * changed or not.
 925          */
 926         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 927
 928         /* And the BSSID changed - we're associated now */
 929         bss_info_changed |= BSS_CHANGED_BSSID;
 930
 931         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 932
 933         mutex_lock(&local->iflist_mtx);
 934         ieee80211_recalc_ps(local, -1);
 935         mutex_unlock(&local->iflist_mtx);
 936
 937         netif_start_queue(sdata->dev);
 938         netif_carrier_on(sdata->dev);
 939 }
 940
 941 static enum rx_mgmt_action __must_check
 942 ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 943                        struct ieee80211_mgd_work *wk)
 944 {
 945         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 946         struct ieee80211_local *local = sdata->local;
 947
 948         wk->tries++;
 949         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 950                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 951                        sdata->dev->name, wk->bss->cbss.bssid);
 952
 953                 /*
 954                  * Most likely AP is not in the range so remove the
 955                  * bss struct for that AP.
 956                  */
 957                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
 958
 959                 /*
 960                  * We might have a pending scan which had no chance to run yet
 961                  * due to work needing to be done. Hence, queue the STAs work
 962                  * again for that.
 963                  */
 964                 ieee80211_queue_work(&local->hw, &ifmgd->work);
 965                 return RX_MGMT_CFG80211_AUTH_TO;
 966         }
 967
 968         printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
 969                         sdata->dev->name, wk->bss->cbss.bssid,
 970                         wk->tries);
 971
 972         /*
 973          * Direct probe is sent to broadcast address as some APs
 974          * will not answer to direct packet in unassociated state.
 975          */
 976         ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
 977
 978         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
 979         run_again(ifmgd, wk->timeout);
 980
 981         return RX_MGMT_NONE;
 982 }
 983
 984
 985 static enum rx_mgmt_action __must_check
 986 ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 987                        struct ieee80211_mgd_work *wk)
 988 {
 989         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 990         struct ieee80211_local *local = sdata->local;
 991
 992         wk->tries++;
 993         if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
 994                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 995                        " timed out\n",
 996                        sdata->dev->name, wk->bss->cbss.bssid);
 997
 998                 /*
 999                  * Most likely AP is not in the range so remove the
1000                  * bss struct for that AP.
1001                  */
1002                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1003
1004                 /*
1005                  * We might have a pending scan which had no chance to run yet
1006                  * due to work needing to be done. Hence, queue the STAs work
1007                  * again for that.
1008                  */
1009                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1010                 return RX_MGMT_CFG80211_AUTH_TO;
1011         }
1012
1013         printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
1014                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1015
1016         ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
1017                             wk->bss->cbss.bssid, NULL, 0, 0);
1018         wk->auth_transaction = 2;
1019
1020         wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
1021         run_again(ifmgd, wk->timeout);
1022
1023         return RX_MGMT_NONE;
1024 }
1025
1026 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1027                                    bool deauth)
1028 {
1029         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1030         struct ieee80211_local *local = sdata->local;
1031         struct sta_info *sta;
1032         u32 changed = 0, config_changed = 0;
1033         u8 bssid[ETH_ALEN];
1034
1035         ASSERT_MGD_MTX(ifmgd);
1036
1037         if (WARN_ON(!ifmgd->associated))
1038                 return;
1039
1040         memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
1041
1042         ifmgd->associated = NULL;
1043         memset(ifmgd->bssid, 0, ETH_ALEN);
1044
1045         if (deauth) {
1046                 kfree(ifmgd->old_associate_work);
1047                 ifmgd->old_associate_work = NULL;
1048         } else {
1049                 struct ieee80211_mgd_work *wk = ifmgd->old_associate_work;
1050
1051                 wk->state = IEEE80211_MGD_STATE_IDLE;
1052                 list_add(&wk->list, &ifmgd->work_list);
1053         }
1054
1055         /*
1056          * we need to commit the associated = NULL change because the
1057          * scan code uses that to determine whether this iface should
1058          * go to/wake up from powersave or not -- and could otherwise
1059          * wake the queues erroneously.
1060          */
1061         smp_mb();
1062
1063         /*
1064          * Thus, we can only afterwards stop the queues -- to account
1065          * for the case where another CPU is finishing a scan at this
1066          * time -- we don't want the scan code to enable queues.
1067          */
1068
1069         netif_stop_queue(sdata->dev);
1070         netif_carrier_off(sdata->dev);
1071
1072         rcu_read_lock();
1073         sta = sta_info_get(local, bssid);
1074         if (sta)
1075                 ieee80211_sta_tear_down_BA_sessions(sta);
1076         rcu_read_unlock();
1077
1078         changed |= ieee80211_reset_erp_info(sdata);
1079
1080         ieee80211_led_assoc(local, 0);
1081         changed |= BSS_CHANGED_ASSOC;
1082         sdata->vif.bss_conf.assoc = false;
1083
1084         ieee80211_set_wmm_default(sdata);
1085
1086         ieee80211_recalc_idle(local);
1087
1088         /* channel(_type) changes are handled by ieee80211_hw_config */
1089         local->oper_channel_type = NL80211_CHAN_NO_HT;
1090
1091         /* on the next assoc, re-program HT parameters */
1092         sdata->ht_opmode_valid = false;
1093
1094         local->power_constr_level = 0;
1095
1096         del_timer_sync(&local->dynamic_ps_timer);
1097         cancel_work_sync(&local->dynamic_ps_enable_work);
1098
1099         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1100                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1101                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1102         }
1103
1104         ieee80211_hw_config(local, config_changed);
1105
1106         /* And the BSSID changed -- not very interesting here */
1107         changed |= BSS_CHANGED_BSSID;
1108         ieee80211_bss_info_change_notify(sdata, changed);
1109
1110         rcu_read_lock();
1111
1112         sta = sta_info_get(local, bssid);
1113         if (!sta) {
1114                 rcu_read_unlock();
1115                 return;
1116         }
1117
1118         sta_info_unlink(&sta);
1119
1120         rcu_read_unlock();
1121
1122         sta_info_destroy(sta);
1123 }
1124
1125 static enum rx_mgmt_action __must_check
1126 ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1127                     struct ieee80211_mgd_work *wk)
1128 {
1129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1130         struct ieee80211_local *local = sdata->local;
1131
1132         wk->tries++;
1133         if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
1134                 printk(KERN_DEBUG "%s: association with AP %pM"
1135                        " timed out\n",
1136                        sdata->dev->name, wk->bss->cbss.bssid);
1137
1138                 /*
1139                  * Most likely AP is not in the range so remove the
1140                  * bss struct for that AP.
1141                  */
1142                 cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
1143
1144                 /*
1145                  * We might have a pending scan which had no chance to run yet
1146                  * due to work needing to be done. Hence, queue the STAs work
1147                  * again for that.
1148                  */
1149                 ieee80211_queue_work(&local->hw, &ifmgd->work);
1150                 return RX_MGMT_CFG80211_ASSOC_TO;
1151         }
1152
1153         printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
1154                sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
1155         ieee80211_send_assoc(sdata, wk);
1156
1157         wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
1158         run_again(ifmgd, wk->timeout);
1159
1160         return RX_MGMT_NONE;
1161 }
1162
1163 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1164                              struct ieee80211_hdr *hdr)
1165 {
1166         /*
1167          * We can postpone the mgd.timer whenever receiving unicast frames
1168          * from AP because we know that the connection is working both ways
1169          * at that time. But multicast frames (and hence also beacons) must
1170          * be ignored here, because we need to trigger the timer during
1171          * data idle periods for sending the periodic probe request to the
1172          * AP we're connected to.
1173          */
1174         if (is_multicast_ether_addr(hdr->addr1))
1175                 return;
1176
1177         mod_timer(&sdata->u.mgd.conn_mon_timer,
1178                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1179 }
1180
1181 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1182 {
1183         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1184         const u8 *ssid;
1185
1186         ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
1187         ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
1188                                  ssid + 2, ssid[1], NULL, 0);
1189
1190         ifmgd->probe_send_count++;
1191         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1192         run_again(ifmgd, ifmgd->probe_timeout);
1193 }
1194
1195 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1196                                    bool beacon)
1197 {
1198         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1199         bool already = false;
1200
1201         if (!netif_running(sdata->dev))
1202                 return;
1203
1204         if (sdata->local->scanning)
1205                 return;
1206
1207         mutex_lock(&ifmgd->mtx);
1208
1209         if (!ifmgd->associated)
1210                 goto out;
1211
1212 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1213         if (beacon && net_ratelimit())
1214                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1215                        "- sending probe request\n", sdata->dev->name);
1216 #endif
1217
1218         /*
1219          * The driver/our work has already reported this event or the
1220          * connection monitoring has kicked in and we have already sent
1221          * a probe request. Or maybe the AP died and the driver keeps
1222          * reporting until we disassociate...
1223          *
1224          * In either case we have to ignore the current call to this
1225          * function (except for setting the correct probe reason bit)
1226          * because otherwise we would reset the timer every time and
1227          * never check whether we received a probe response!
1228          */
1229         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1230                             IEEE80211_STA_CONNECTION_POLL))
1231                 already = true;
1232
1233         if (beacon)
1234                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1235         else
1236                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1237
1238         if (already)
1239                 goto out;
1240
1241         mutex_lock(&sdata->local->iflist_mtx);
1242         ieee80211_recalc_ps(sdata->local, -1);
1243         mutex_unlock(&sdata->local->iflist_mtx);
1244
1245         ifmgd->probe_send_count = 0;
1246         ieee80211_mgd_probe_ap_send(sdata);
1247  out:
1248         mutex_unlock(&ifmgd->mtx);
1249 }
1250
1251 void ieee80211_beacon_loss_work(struct work_struct *work)
1252 {
1253         struct ieee80211_sub_if_data *sdata =
1254                 container_of(work, struct ieee80211_sub_if_data,
1255                              u.mgd.beacon_loss_work);
1256
1257         ieee80211_mgd_probe_ap(sdata, true);
1258 }
1259
1260 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1261 {
1262         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1263
1264         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1265 }
1266 EXPORT_SYMBOL(ieee80211_beacon_loss);
1267
1268 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1269                                      struct ieee80211_mgd_work *wk)
1270 {
1271         wk->state = IEEE80211_MGD_STATE_IDLE;
1272         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1273 }
1274
1275
1276 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1277                                      struct ieee80211_mgd_work *wk,
1278                                      struct ieee80211_mgmt *mgmt,
1279                                      size_t len)
1280 {
1281         u8 *pos;
1282         struct ieee802_11_elems elems;
1283
1284         pos = mgmt->u.auth.variable;
1285         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1286         if (!elems.challenge)
1287                 return;
1288         ieee80211_send_auth(sdata, 3, wk->auth_alg,
1289                             elems.challenge - 2, elems.challenge_len + 2,
1290                             wk->bss->cbss.bssid,
1291                             wk->key, wk->key_len, wk->key_idx);
1292         wk->auth_transaction = 4;
1293 }
1294
1295 static enum rx_mgmt_action __must_check
1296 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1297                        struct ieee80211_mgd_work *wk,
1298                        struct ieee80211_mgmt *mgmt, size_t len)
1299 {
1300         u16 auth_alg, auth_transaction, status_code;
1301
1302         if (wk->state != IEEE80211_MGD_STATE_AUTH)
1303                 return RX_MGMT_NONE;
1304
1305         if (len < 24 + 6)
1306                 return RX_MGMT_NONE;
1307
1308         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1309                 return RX_MGMT_NONE;
1310
1311         if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1312                 return RX_MGMT_NONE;
1313
1314         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1315         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1316         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1317
1318         if (auth_alg != wk->auth_alg ||
1319             auth_transaction != wk->auth_transaction)
1320                 return RX_MGMT_NONE;
1321
1322         if (status_code != WLAN_STATUS_SUCCESS) {
1323                 list_del(&wk->list);
1324                 kfree(wk);
1325                 return RX_MGMT_CFG80211_AUTH;
1326         }
1327
1328         switch (wk->auth_alg) {
1329         case WLAN_AUTH_OPEN:
1330         case WLAN_AUTH_LEAP:
1331         case WLAN_AUTH_FT:
1332                 ieee80211_auth_completed(sdata, wk);
1333                 return RX_MGMT_CFG80211_AUTH;
1334         case WLAN_AUTH_SHARED_KEY:
1335                 if (wk->auth_transaction == 4) {
1336                         ieee80211_auth_completed(sdata, wk);
1337                         return RX_MGMT_CFG80211_AUTH;
1338                 } else
1339                         ieee80211_auth_challenge(sdata, wk, mgmt, len);
1340                 break;
1341         }
1342
1343         return RX_MGMT_NONE;
1344 }
1345
1346
1347 static enum rx_mgmt_action __must_check
1348 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1349                          struct ieee80211_mgd_work *wk,
1350                          struct ieee80211_mgmt *mgmt, size_t len)
1351 {
1352         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1353         const u8 *bssid = NULL;
1354         u16 reason_code;
1355
1356         if (len < 24 + 2)
1357                 return RX_MGMT_NONE;
1358
1359         ASSERT_MGD_MTX(ifmgd);
1360
1361         if (wk)
1362                 bssid = wk->bss->cbss.bssid;
1363         else
1364                 bssid = ifmgd->associated->cbss.bssid;
1365
1366         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1367
1368         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1369                         sdata->dev->name, bssid, reason_code);
1370
1371         if (!wk) {
1372                 ieee80211_set_disassoc(sdata, true);
1373         } else {
1374                 list_del(&wk->list);
1375                 kfree(wk);
1376         }
1377
1378         return RX_MGMT_CFG80211_DEAUTH;
1379 }
1380
1381
1382 static enum rx_mgmt_action __must_check
1383 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1384                            struct ieee80211_mgmt *mgmt, size_t len)
1385 {
1386         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1387         u16 reason_code;
1388
1389         if (len < 24 + 2)
1390                 return RX_MGMT_NONE;
1391
1392         ASSERT_MGD_MTX(ifmgd);
1393
1394         if (WARN_ON(!ifmgd->associated))
1395                 return RX_MGMT_NONE;
1396
1397         if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
1398                 return RX_MGMT_NONE;
1399
1400         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1401
1402         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1403                         sdata->dev->name, mgmt->sa, reason_code);
1404
1405         ieee80211_set_disassoc(sdata, false);
1406         return RX_MGMT_CFG80211_DISASSOC;
1407 }
1408
1409
1410 static enum rx_mgmt_action __must_check
1411 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1412                              struct ieee80211_mgd_work *wk,
1413                              struct ieee80211_mgmt *mgmt, size_t len,
1414                              bool reassoc)
1415 {
1416         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1417         struct ieee80211_local *local = sdata->local;
1418         struct ieee80211_supported_band *sband;
1419         struct sta_info *sta;
1420         u32 rates, basic_rates;
1421         u16 capab_info, status_code, aid;
1422         struct ieee802_11_elems elems;
1423         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1424         u8 *pos;
1425         u32 changed = 0;
1426         int i, j;
1427         bool have_higher_than_11mbit = false, newsta = false;
1428         u16 ap_ht_cap_flags;
1429
1430         /*
1431          * AssocResp and ReassocResp have identical structure, so process both
1432          * of them in this function.
1433          */
1434
1435         if (len < 24 + 6)
1436                 return RX_MGMT_NONE;
1437
1438         if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
1439                 return RX_MGMT_NONE;
1440
1441         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1442         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1443         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1444
1445         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1446                "status=%d aid=%d)\n",
1447                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1448                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1449
1450         pos = mgmt->u.assoc_resp.variable;
1451         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1452
1453         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1454             elems.timeout_int && elems.timeout_int_len == 5 &&
1455             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1456                 u32 tu, ms;
1457                 tu = get_unaligned_le32(elems.timeout_int + 1);
1458                 ms = tu * 1024 / 1000;
1459                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1460                        "comeback duration %u TU (%u ms)\n",
1461                        sdata->dev->name, tu, ms);
1462                 wk->timeout = jiffies + msecs_to_jiffies(ms);
1463                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1464                         run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
1465                 return RX_MGMT_NONE;
1466         }
1467
1468         if (status_code != WLAN_STATUS_SUCCESS) {
1469                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1470                        sdata->dev->name, status_code);
1471                 wk->state = IEEE80211_MGD_STATE_IDLE;
1472                 return RX_MGMT_CFG80211_ASSOC;
1473         }
1474
1475         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1476                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1477                        "set\n", sdata->dev->name, aid);
1478         aid &= ~(BIT(15) | BIT(14));
1479
1480         if (!elems.supp_rates) {
1481                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1482                        sdata->dev->name);
1483                 return RX_MGMT_NONE;
1484         }
1485
1486         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1487         ifmgd->aid = aid;
1488
1489         rcu_read_lock();
1490
1491         /* Add STA entry for the AP */
1492         sta = sta_info_get(local, wk->bss->cbss.bssid);
1493         if (!sta) {
1494                 newsta = true;
1495
1496                 rcu_read_unlock();
1497
1498                 sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
1499                 if (!sta) {
1500                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1501                                " the AP\n", sdata->dev->name);
1502                         return RX_MGMT_NONE;
1503                 }
1504
1505                 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1506                                    WLAN_STA_ASSOC_AP);
1507                 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1508                         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1509
1510                 rcu_read_lock();
1511         }
1512
1513         rates = 0;
1514         basic_rates = 0;
1515         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1516
1517         for (i = 0; i < elems.supp_rates_len; i++) {
1518                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1519                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1520
1521                 if (rate > 110)
1522                         have_higher_than_11mbit = true;
1523
1524                 for (j = 0; j < sband->n_bitrates; j++) {
1525                         if (sband->bitrates[j].bitrate == rate) {
1526                                 rates |= BIT(j);
1527                                 if (is_basic)
1528                                         basic_rates |= BIT(j);
1529                                 break;
1530                         }
1531                 }
1532         }
1533
1534         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1535                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1536                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1537
1538                 if (rate > 110)
1539                         have_higher_than_11mbit = true;
1540
1541                 for (j = 0; j < sband->n_bitrates; j++) {
1542                         if (sband->bitrates[j].bitrate == rate) {
1543                                 rates |= BIT(j);
1544                                 if (is_basic)
1545                                         basic_rates |= BIT(j);
1546                                 break;
1547                         }
1548                 }
1549         }
1550
1551         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1552         sdata->vif.bss_conf.basic_rates = basic_rates;
1553
1554         /* cf. IEEE 802.11 9.2.12 */
1555         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1556             have_higher_than_11mbit)
1557                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1558         else
1559                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1560
1561         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1562                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1563                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1564
1565         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1566
1567         rate_control_rate_init(sta);
1568
1569         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1570                 set_sta_flags(sta, WLAN_STA_MFP);
1571
1572         if (elems.wmm_param)
1573                 set_sta_flags(sta, WLAN_STA_WME);
1574
1575         if (newsta) {
1576                 int err = sta_info_insert(sta);
1577                 if (err) {
1578                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1579                                " the AP (error %d)\n", sdata->dev->name, err);
1580                         rcu_read_unlock();
1581                         return RX_MGMT_NONE;
1582                 }
1583         }
1584
1585         rcu_read_unlock();
1586
1587         if (elems.wmm_param)
1588                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1589                                          elems.wmm_param_len);
1590         else
1591                 ieee80211_set_wmm_default(sdata);
1592
1593         if (elems.ht_info_elem && elems.wmm_param &&
1594             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1595             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1596                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1597                                                wk->bss->cbss.bssid,
1598                                                ap_ht_cap_flags);
1599
1600         /* delete work item -- must be before set_associated for PS */
1601         list_del(&wk->list);
1602
1603         /* set AID and assoc capability,
1604          * ieee80211_set_associated() will tell the driver */
1605         bss_conf->aid = aid;
1606         bss_conf->assoc_capability = capab_info;
1607         /* this will take ownership of wk */
1608         ieee80211_set_associated(sdata, wk, changed);
1609
1610         /*
1611          * Start timer to probe the connection to the AP now.
1612          * Also start the timer that will detect beacon loss.
1613          */
1614         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1615         mod_beacon_timer(sdata);
1616
1617         return RX_MGMT_CFG80211_ASSOC;
1618 }
1619
1620
1621 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1622                                   struct ieee80211_mgmt *mgmt,
1623                                   size_t len,
1624                                   struct ieee80211_rx_status *rx_status,
1625                                   struct ieee802_11_elems *elems,
1626                                   bool beacon)
1627 {
1628         struct ieee80211_local *local = sdata->local;
1629         int freq;
1630         struct ieee80211_bss *bss;
1631         struct ieee80211_channel *channel;
1632
1633         if (elems->ds_params && elems->ds_params_len == 1)
1634                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1635         else
1636                 freq = rx_status->freq;
1637
1638         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1639
1640         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1641                 return;
1642
1643         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1644                                         channel, beacon);
1645         if (bss)
1646                 ieee80211_rx_bss_put(local, bss);
1647
1648         if (!sdata->u.mgd.associated)
1649                 return;
1650
1651         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1652             (memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
1653                                                         ETH_ALEN) == 0)) {
1654                 struct ieee80211_channel_sw_ie *sw_elem =
1655                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1656                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1657         }
1658 }
1659
1660
1661 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1662                                          struct ieee80211_mgd_work *wk,
1663                                          struct ieee80211_mgmt *mgmt, size_t len,
1664                                          struct ieee80211_rx_status *rx_status)
1665 {
1666         struct ieee80211_if_managed *ifmgd;
1667         size_t baselen;
1668         struct ieee802_11_elems elems;
1669
1670         ifmgd = &sdata->u.mgd;
1671
1672         ASSERT_MGD_MTX(ifmgd);
1673
1674         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1675                 return; /* ignore ProbeResp to foreign address */
1676
1677         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1678         if (baselen > len)
1679                 return;
1680
1681         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1682                                 &elems);
1683
1684         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1685
1686         /* direct probe may be part of the association flow */
1687         if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
1688                 printk(KERN_DEBUG "%s: direct probe responded\n",
1689                        sdata->dev->name);
1690                 wk->tries = 0;
1691                 wk->state = IEEE80211_MGD_STATE_AUTH;
1692                 WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
1693         }
1694
1695         if (ifmgd->associated &&
1696             memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
1697             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1698                             IEEE80211_STA_CONNECTION_POLL)) {
1699                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1700                                   IEEE80211_STA_BEACON_POLL);
1701                 mutex_lock(&sdata->local->iflist_mtx);
1702                 ieee80211_recalc_ps(sdata->local, -1);
1703                 mutex_unlock(&sdata->local->iflist_mtx);
1704                 /*
1705                  * We've received a probe response, but are not sure whether
1706                  * we have or will be receiving any beacons or data, so let's
1707                  * schedule the timers again, just in case.
1708                  */
1709                 mod_beacon_timer(sdata);
1710                 mod_timer(&ifmgd->conn_mon_timer,
1711                           round_jiffies_up(jiffies +
1712                                            IEEE80211_CONNECTION_IDLE_TIME));
1713         }
1714 }
1715
1716 /*
1717  * This is the canonical list of information elements we care about,
1718  * the filter code also gives us all changes to the Microsoft OUI
1719  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1720  *
1721  * We implement beacon filtering in software since that means we can
1722  * avoid processing the frame here and in cfg80211, and userspace
1723  * will not be able to tell whether the hardware supports it or not.
1724  *
1725  * XXX: This list needs to be dynamic -- userspace needs to be able to
1726  *      add items it requires. It also needs to be able to tell us to
1727  *      look out for other vendor IEs.
1728  */
1729 static const u64 care_about_ies =
1730         (1ULL << WLAN_EID_COUNTRY) |
1731         (1ULL << WLAN_EID_ERP_INFO) |
1732         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1733         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1734         (1ULL << WLAN_EID_HT_CAPABILITY) |
1735         (1ULL << WLAN_EID_HT_INFORMATION);
1736
1737 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1738                                      struct ieee80211_mgmt *mgmt,
1739                                      size_t len,
1740                                      struct ieee80211_rx_status *rx_status)
1741 {
1742         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1743         size_t baselen;
1744         struct ieee802_11_elems elems;
1745         struct ieee80211_local *local = sdata->local;
1746         u32 changed = 0;
1747         bool erp_valid, directed_tim = false;
1748         u8 erp_value = 0;
1749         u32 ncrc;
1750         u8 *bssid;
1751
1752         ASSERT_MGD_MTX(ifmgd);
1753
1754         /* Process beacon from the current BSS */
1755         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1756         if (baselen > len)
1757                 return;
1758
1759         if (rx_status->freq != local->hw.conf.channel->center_freq)
1760                 return;
1761
1762         /*
1763          * We might have received a number of frames, among them a
1764          * disassoc frame and a beacon...
1765          */
1766         if (!ifmgd->associated)
1767                 return;
1768
1769         bssid = ifmgd->associated->cbss.bssid;
1770
1771         /*
1772          * And in theory even frames from a different AP we were just
1773          * associated to a split-second ago!
1774          */
1775         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1776                 return;
1777
1778         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1779 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1780                 if (net_ratelimit()) {
1781                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1782                                "to a received beacon\n", sdata->dev->name);
1783                 }
1784 #endif
1785                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1786                 mutex_lock(&local->iflist_mtx);
1787                 ieee80211_recalc_ps(local, -1);
1788                 mutex_unlock(&local->iflist_mtx);
1789         }
1790
1791         /*
1792          * Push the beacon loss detection into the future since
1793          * we are processing a beacon from the AP just now.
1794          */
1795         mod_beacon_timer(sdata);
1796
1797         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1798         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1799                                           len - baselen, &elems,
1800                                           care_about_ies, ncrc);
1801
1802         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1803                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1804                                                    ifmgd->aid);
1805
1806         if (ncrc != ifmgd->beacon_crc) {
1807                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1808                                       true);
1809
1810                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1811                                          elems.wmm_param_len);
1812         }
1813
1814         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1815                 if (directed_tim) {
1816                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1817                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1818                                 ieee80211_hw_config(local,
1819                                                     IEEE80211_CONF_CHANGE_PS);
1820                                 ieee80211_send_nullfunc(local, sdata, 0);
1821                         } else {
1822                                 local->pspolling = true;
1823
1824                                 /*
1825                                  * Here is assumed that the driver will be
1826                                  * able to send ps-poll frame and receive a
1827                                  * response even though power save mode is
1828                                  * enabled, but some drivers might require
1829                                  * to disable power save here. This needs
1830                                  * to be investigated.
1831                                  */
1832                                 ieee80211_send_pspoll(local, sdata);
1833                         }
1834                 }
1835         }
1836
1837         if (ncrc == ifmgd->beacon_crc)
1838                 return;
1839         ifmgd->beacon_crc = ncrc;
1840
1841         if (elems.erp_info && elems.erp_info_len >= 1) {
1842                 erp_valid = true;
1843                 erp_value = elems.erp_info[0];
1844         } else {
1845                 erp_valid = false;
1846         }
1847         changed |= ieee80211_handle_bss_capability(sdata,
1848                         le16_to_cpu(mgmt->u.beacon.capab_info),
1849                         erp_valid, erp_value);
1850
1851
1852         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1853             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1854                 struct sta_info *sta;
1855                 struct ieee80211_supported_band *sband;
1856                 u16 ap_ht_cap_flags;
1857
1858                 rcu_read_lock();
1859
1860                 sta = sta_info_get(local, bssid);
1861                 if (WARN_ON(!sta)) {
1862                         rcu_read_unlock();
1863                         return;
1864                 }
1865
1866                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1867
1868                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1869                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1870
1871                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1872
1873                 rcu_read_unlock();
1874
1875                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1876                                                bssid, ap_ht_cap_flags);
1877         }
1878
1879         /* Note: country IE parsing is done for us by cfg80211 */
1880         if (elems.country_elem) {
1881                 /* TODO: IBSS also needs this */
1882                 if (elems.pwr_constr_elem)
1883                         ieee80211_handle_pwr_constr(sdata,
1884                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1885                                 elems.pwr_constr_elem,
1886                                 elems.pwr_constr_elem_len);
1887         }
1888
1889         ieee80211_bss_info_change_notify(sdata, changed);
1890 }
1891
1892 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1893                                           struct sk_buff *skb)
1894 {
1895         struct ieee80211_local *local = sdata->local;
1896         struct ieee80211_mgmt *mgmt;
1897         u16 fc;
1898
1899         if (skb->len < 24)
1900                 return RX_DROP_MONITOR;
1901
1902         mgmt = (struct ieee80211_mgmt *) skb->data;
1903         fc = le16_to_cpu(mgmt->frame_control);
1904
1905         switch (fc & IEEE80211_FCTL_STYPE) {
1906         case IEEE80211_STYPE_PROBE_RESP:
1907         case IEEE80211_STYPE_BEACON:
1908         case IEEE80211_STYPE_AUTH:
1909         case IEEE80211_STYPE_ASSOC_RESP:
1910         case IEEE80211_STYPE_REASSOC_RESP:
1911         case IEEE80211_STYPE_DEAUTH:
1912         case IEEE80211_STYPE_DISASSOC:
1913         case IEEE80211_STYPE_ACTION:
1914                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1915                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1916                 return RX_QUEUED;
1917         }
1918
1919         return RX_DROP_MONITOR;
1920 }
1921
1922 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1923                                          struct sk_buff *skb)
1924 {
1925         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1926         struct ieee80211_rx_status *rx_status;
1927         struct ieee80211_mgmt *mgmt;
1928         struct ieee80211_mgd_work *wk;
1929         enum rx_mgmt_action rma = RX_MGMT_NONE;
1930         u16 fc;
1931
1932         rx_status = (struct ieee80211_rx_status *) skb->cb;
1933         mgmt = (struct ieee80211_mgmt *) skb->data;
1934         fc = le16_to_cpu(mgmt->frame_control);
1935
1936         mutex_lock(&ifmgd->mtx);
1937
1938         if (ifmgd->associated &&
1939             memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
1940                                                         ETH_ALEN) == 0) {
1941                 switch (fc & IEEE80211_FCTL_STYPE) {
1942                 case IEEE80211_STYPE_BEACON:
1943                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1944                                                  rx_status);
1945                         break;
1946                 case IEEE80211_STYPE_PROBE_RESP:
1947                         ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
1948                                                      skb->len, rx_status);
1949                         break;
1950                 case IEEE80211_STYPE_DEAUTH:
1951                         rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
1952                                                        mgmt, skb->len);
1953                         break;
1954                 case IEEE80211_STYPE_DISASSOC:
1955                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1956                         break;
1957                 case IEEE80211_STYPE_ACTION:
1958                         /* XXX: differentiate, can only happen for CSA now! */
1959                         ieee80211_sta_process_chanswitch(sdata,
1960                                         &mgmt->u.action.u.chan_switch.sw_elem,
1961                                         ifmgd->associated);
1962                         break;
1963                 }
1964                 mutex_unlock(&ifmgd->mtx);
1965
1966                 switch (rma) {
1967                 case RX_MGMT_NONE:
1968                         /* no action */
1969                         break;
1970                 case RX_MGMT_CFG80211_DEAUTH:
1971                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1972                         break;
1973                 case RX_MGMT_CFG80211_DISASSOC:
1974                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1975                         break;
1976                 default:
1977                         WARN(1, "unexpected: %d", rma);
1978                 }
1979                 goto out;
1980         }
1981
1982         list_for_each_entry(wk, &ifmgd->work_list, list) {
1983                 if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
1984                         continue;
1985
1986                 switch (fc & IEEE80211_FCTL_STYPE) {
1987                 case IEEE80211_STYPE_PROBE_RESP:
1988                         ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
1989                                                      rx_status);
1990                         break;
1991                 case IEEE80211_STYPE_AUTH:
1992                         rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
1993                         break;
1994                 case IEEE80211_STYPE_ASSOC_RESP:
1995                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
1996                                                            skb->len, false);
1997                         break;
1998                 case IEEE80211_STYPE_REASSOC_RESP:
1999                         rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
2000                                                            skb->len, true);
2001                         break;
2002                 case IEEE80211_STYPE_DEAUTH:
2003                         rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
2004                                                        skb->len);
2005                         break;
2006                 }
2007                 /*
2008                  * We've processed this frame for that work, so it can't
2009                  * belong to another work struct.
2010                  * NB: this is also required for correctness because the
2011                  * called functions can free 'wk', and for 'rma'!
2012                  */
2013                 break;
2014         }
2015
2016         mutex_unlock(&ifmgd->mtx);
2017
2018         switch (rma) {
2019         case RX_MGMT_NONE:
2020                 /* no action */
2021                 break;
2022         case RX_MGMT_CFG80211_AUTH:
2023                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
2024                 break;
2025         case RX_MGMT_CFG80211_ASSOC:
2026                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
2027                 break;
2028         case RX_MGMT_CFG80211_DEAUTH:
2029                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2030                 break;
2031         default:
2032                 WARN(1, "unexpected: %d", rma);
2033         }
2034
2035  out:
2036         kfree_skb(skb);
2037 }
2038
2039 static void ieee80211_sta_timer(unsigned long data)
2040 {
2041         struct ieee80211_sub_if_data *sdata =
2042                 (struct ieee80211_sub_if_data *) data;
2043         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2044         struct ieee80211_local *local = sdata->local;
2045
2046         if (local->quiescing) {
2047                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2048                 return;
2049         }
2050
2051         ieee80211_queue_work(&local->hw, &ifmgd->work);
2052 }
2053
2054 static void ieee80211_sta_work(struct work_struct *work)
2055 {
2056         struct ieee80211_sub_if_data *sdata =
2057                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2058         struct ieee80211_local *local = sdata->local;
2059         struct ieee80211_if_managed *ifmgd;
2060         struct sk_buff *skb;
2061         struct ieee80211_mgd_work *wk, *tmp;
2062         LIST_HEAD(free_work);
2063         enum rx_mgmt_action rma;
2064         bool anybusy = false;
2065
2066         if (!netif_running(sdata->dev))
2067                 return;
2068
2069         if (local->scanning)
2070                 return;
2071
2072         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2073                 return;
2074
2075         /*
2076          * ieee80211_queue_work() should have picked up most cases,
2077          * here we'll pick the the rest.
2078          */
2079         if (WARN(local->suspended, "STA MLME work scheduled while "
2080                  "going to suspend\n"))
2081                 return;
2082
2083         ifmgd = &sdata->u.mgd;
2084
2085         /* first process frames to avoid timing out while a frame is pending */
2086         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2087                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2088
2089         /* then process the rest of the work */
2090         mutex_lock(&ifmgd->mtx);
2091
2092         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2093                             IEEE80211_STA_CONNECTION_POLL) &&
2094             ifmgd->associated) {
2095                 u8 bssid[ETH_ALEN];
2096
2097                 memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
2098                 if (time_is_after_jiffies(ifmgd->probe_timeout))
2099                         run_again(ifmgd, ifmgd->probe_timeout);
2100
2101                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
2102 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2103                         printk(KERN_DEBUG "No probe response from AP %pM"
2104                                 " after %dms, try %d\n", bssid,
2105                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
2106                                 ifmgd->probe_send_count);
2107 #endif
2108                         ieee80211_mgd_probe_ap_send(sdata);
2109                 } else {
2110                         /*
2111                          * We actually lost the connection ... or did we?
2112                          * Let's make sure!
2113                          */
2114                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2115                                           IEEE80211_STA_BEACON_POLL);
2116                         printk(KERN_DEBUG "No probe response from AP %pM"
2117                                 " after %dms, disconnecting.\n",
2118                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
2119                         ieee80211_set_disassoc(sdata, true);
2120                         mutex_unlock(&ifmgd->mtx);
2121                         /*
2122                          * must be outside lock due to cfg80211,
2123                          * but that's not a problem.
2124                          */
2125                         ieee80211_send_deauth_disassoc(sdata, bssid,
2126                                         IEEE80211_STYPE_DEAUTH,
2127                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2128                                         NULL);
2129                         mutex_lock(&ifmgd->mtx);
2130                 }
2131         }
2132
2133
2134         ieee80211_recalc_idle(local);
2135
2136         list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
2137                 if (time_is_after_jiffies(wk->timeout)) {
2138                         /*
2139                          * This work item isn't supposed to be worked on
2140                          * right now, but take care to adjust the timer
2141                          * properly.
2142                          */
2143                         run_again(ifmgd, wk->timeout);
2144                         continue;
2145                 }
2146
2147                 switch (wk->state) {
2148                 default:
2149                         WARN_ON(1);
2150                         /* fall through */
2151                 case IEEE80211_MGD_STATE_IDLE:
2152                         /* nothing */
2153                         rma = RX_MGMT_NONE;
2154                         break;
2155                 case IEEE80211_MGD_STATE_PROBE:
2156                         rma = ieee80211_direct_probe(sdata, wk);
2157                         break;
2158                 case IEEE80211_MGD_STATE_AUTH:
2159                         rma = ieee80211_authenticate(sdata, wk);
2160                         break;
2161                 case IEEE80211_MGD_STATE_ASSOC:
2162                         rma = ieee80211_associate(sdata, wk);
2163                         break;
2164                 }
2165
2166                 switch (rma) {
2167                 case RX_MGMT_NONE:
2168                         /* no action required */
2169                         break;
2170                 case RX_MGMT_CFG80211_AUTH_TO:
2171                 case RX_MGMT_CFG80211_ASSOC_TO:
2172                         list_del(&wk->list);
2173                         list_add(&wk->list, &free_work);
2174                         wk->tries = rma; /* small abuse but only local */
2175                         break;
2176                 default:
2177                         WARN(1, "unexpected: %d", rma);
2178                 }
2179         }
2180
2181         list_for_each_entry(wk, &ifmgd->work_list, list) {
2182                 if (wk->state != IEEE80211_MGD_STATE_IDLE) {
2183                         anybusy = true;
2184                         break;
2185                 }
2186         }
2187         if (!anybusy &&
2188             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
2189                 ieee80211_queue_delayed_work(&local->hw,
2190                                              &local->scan_work,
2191                                              round_jiffies_relative(0));
2192
2193         mutex_unlock(&ifmgd->mtx);
2194
2195         list_for_each_entry_safe(wk, tmp, &free_work, list) {
2196                 switch (wk->tries) {
2197                 case RX_MGMT_CFG80211_AUTH_TO:
2198                         cfg80211_send_auth_timeout(sdata->dev,
2199                                                    wk->bss->cbss.bssid);
2200                         break;
2201                 case RX_MGMT_CFG80211_ASSOC_TO:
2202                         cfg80211_send_assoc_timeout(sdata->dev,
2203                                                     wk->bss->cbss.bssid);
2204                         break;
2205                 default:
2206                         WARN(1, "unexpected: %d", wk->tries);
2207                 }
2208
2209                 list_del(&wk->list);
2210                 kfree(wk);
2211         }
2212
2213         ieee80211_recalc_idle(local);
2214 }
2215
2216 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2217 {
2218         struct ieee80211_sub_if_data *sdata =
2219                 (struct ieee80211_sub_if_data *) data;
2220         struct ieee80211_local *local = sdata->local;
2221
2222         if (local->quiescing)
2223                 return;
2224
2225         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
2226 }
2227
2228 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2229 {
2230         struct ieee80211_sub_if_data *sdata =
2231                 (struct ieee80211_sub_if_data *) data;
2232         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2233         struct ieee80211_local *local = sdata->local;
2234
2235         if (local->quiescing)
2236                 return;
2237
2238         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2239 }
2240
2241 static void ieee80211_sta_monitor_work(struct work_struct *work)
2242 {
2243         struct ieee80211_sub_if_data *sdata =
2244                 container_of(work, struct ieee80211_sub_if_data,
2245                              u.mgd.monitor_work);
2246
2247         ieee80211_mgd_probe_ap(sdata, false);
2248 }
2249
2250 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2251 {
2252         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2253                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2254                                         IEEE80211_STA_CONNECTION_POLL);
2255
2256                 /* let's probe the connection once */
2257                 ieee80211_queue_work(&sdata->local->hw,
2258                            &sdata->u.mgd.monitor_work);
2259                 /* and do all the other regular work too */
2260                 ieee80211_queue_work(&sdata->local->hw,
2261                            &sdata->u.mgd.work);
2262         }
2263 }
2264
2265 #ifdef CONFIG_PM
2266 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2267 {
2268         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2269
2270         /*
2271          * we need to use atomic bitops for the running bits
2272          * only because both timers might fire at the same
2273          * time -- the code here is properly synchronised.
2274          */
2275
2276         cancel_work_sync(&ifmgd->work);
2277         cancel_work_sync(&ifmgd->beacon_loss_work);
2278         if (del_timer_sync(&ifmgd->timer))
2279                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2280
2281         cancel_work_sync(&ifmgd->chswitch_work);
2282         if (del_timer_sync(&ifmgd->chswitch_timer))
2283                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2284
2285         cancel_work_sync(&ifmgd->monitor_work);
2286         /* these will just be re-established on connection */
2287         del_timer_sync(&ifmgd->conn_mon_timer);
2288         del_timer_sync(&ifmgd->bcn_mon_timer);
2289 }
2290
2291 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2292 {
2293         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2294
2295         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2296                 add_timer(&ifmgd->timer);
2297         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2298                 add_timer(&ifmgd->chswitch_timer);
2299 }
2300 #endif
2301
2302 /* interface setup */
2303 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2304 {
2305         struct ieee80211_if_managed *ifmgd;
2306
2307         ifmgd = &sdata->u.mgd;
2308         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2309         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2310         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2311         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2312         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2313                     (unsigned long) sdata);
2314         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2315                     (unsigned long) sdata);
2316         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2317                     (unsigned long) sdata);
2318         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2319                     (unsigned long) sdata);
2320         skb_queue_head_init(&ifmgd->skb_queue);
2321
2322         INIT_LIST_HEAD(&ifmgd->work_list);
2323
2324         ifmgd->capab = WLAN_CAPABILITY_ESS;
2325         ifmgd->flags = 0;
2326         if (sdata->local->hw.queues >= 4)
2327                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2328
2329         mutex_init(&ifmgd->mtx);
2330 }
2331
2332 /* scan finished notification */
2333 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2334 {
2335         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2336
2337         /* Restart STA timers */
2338         rcu_read_lock();
2339         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2340                 ieee80211_restart_sta_timer(sdata);
2341         rcu_read_unlock();
2342 }
2343
2344 int ieee80211_max_network_latency(struct notifier_block *nb,
2345                                   unsigned long data, void *dummy)
2346 {
2347         s32 latency_usec = (s32) data;
2348         struct ieee80211_local *local =
2349                 container_of(nb, struct ieee80211_local,
2350                              network_latency_notifier);
2351
2352         mutex_lock(&local->iflist_mtx);
2353         ieee80211_recalc_ps(local, latency_usec);
2354         mutex_unlock(&local->iflist_mtx);
2355
2356         return 0;
2357 }
2358
2359 /* config hooks */
2360 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2361                        struct cfg80211_auth_request *req)
2362 {
2363         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2364         const u8 *ssid;
2365         struct ieee80211_mgd_work *wk;
2366         u16 auth_alg;
2367
2368         switch (req->auth_type) {
2369         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2370                 auth_alg = WLAN_AUTH_OPEN;
2371                 break;
2372         case NL80211_AUTHTYPE_SHARED_KEY:
2373                 auth_alg = WLAN_AUTH_SHARED_KEY;
2374                 break;
2375         case NL80211_AUTHTYPE_FT:
2376                 auth_alg = WLAN_AUTH_FT;
2377                 break;
2378         case NL80211_AUTHTYPE_NETWORK_EAP:
2379                 auth_alg = WLAN_AUTH_LEAP;
2380                 break;
2381         default:
2382                 return -EOPNOTSUPP;
2383         }
2384
2385         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2386         if (!wk)
2387                 return -ENOMEM;
2388
2389         wk->bss = (void *)req->bss;
2390
2391         if (req->ie && req->ie_len) {
2392                 memcpy(wk->ie, req->ie, req->ie_len);
2393                 wk->ie_len = req->ie_len;
2394         }
2395
2396         if (req->key && req->key_len) {
2397                 wk->key_len = req->key_len;
2398                 wk->key_idx = req->key_idx;
2399                 memcpy(wk->key, req->key, req->key_len);
2400         }
2401
2402         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2403         memcpy(wk->ssid, ssid + 2, ssid[1]);
2404         wk->ssid_len = ssid[1];
2405
2406         wk->state = IEEE80211_MGD_STATE_PROBE;
2407         wk->auth_alg = auth_alg;
2408         wk->timeout = jiffies; /* run right away */
2409
2410         /*
2411          * XXX: if still associated need to tell AP that we're going
2412          *      to sleep and then change channel etc.
2413          */
2414         sdata->local->oper_channel = req->bss->channel;
2415         ieee80211_hw_config(sdata->local, 0);
2416
2417         mutex_lock(&ifmgd->mtx);
2418         list_add(&wk->list, &sdata->u.mgd.work_list);
2419         mutex_unlock(&ifmgd->mtx);
2420
2421         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2422         return 0;
2423 }
2424
2425 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2426                         struct cfg80211_assoc_request *req)
2427 {
2428         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2429         struct ieee80211_mgd_work *wk, *found = NULL;
2430         int i, err;
2431
2432         mutex_lock(&ifmgd->mtx);
2433
2434         list_for_each_entry(wk, &ifmgd->work_list, list) {
2435                 if (&wk->bss->cbss == req->bss &&
2436                     wk->state == IEEE80211_MGD_STATE_IDLE) {
2437                         found = wk;
2438                         break;
2439                 }
2440         }
2441
2442         if (!found) {
2443                 err = -ENOLINK;
2444                 goto out;
2445         }
2446
2447         list_del(&found->list);
2448
2449         wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
2450         if (!wk) {
2451                 list_add(&found->list, &ifmgd->work_list);
2452                 err = -ENOMEM;
2453                 goto out;
2454         }
2455
2456         list_add(&wk->list, &ifmgd->work_list);
2457
2458         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2459
2460         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2461                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2462                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2463                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2464                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2465
2466         sdata->local->oper_channel = req->bss->channel;
2467         ieee80211_hw_config(sdata->local, 0);
2468
2469         if (req->ie && req->ie_len) {
2470                 memcpy(wk->ie, req->ie, req->ie_len);
2471                 wk->ie_len = req->ie_len;
2472         } else
2473                 wk->ie_len = 0;
2474
2475         if (req->prev_bssid)
2476                 memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
2477
2478         wk->state = IEEE80211_MGD_STATE_ASSOC;
2479         wk->tries = 0;
2480         wk->timeout = jiffies; /* run right away */
2481
2482         if (req->use_mfp) {
2483                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2484                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2485         } else {
2486                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2487                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2488         }
2489
2490         if (req->crypto.control_port)
2491                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2492         else
2493                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2494
2495         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
2496
2497         err = 0;
2498
2499  out:
2500         mutex_unlock(&ifmgd->mtx);
2501         return err;
2502 }
2503
2504 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2505                          struct cfg80211_deauth_request *req,
2506                          void *cookie)
2507 {
2508         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2509         struct ieee80211_mgd_work *wk;
2510         const u8 *bssid = NULL;
2511         bool not_auth_yet = false;
2512
2513         mutex_lock(&ifmgd->mtx);
2514
2515         if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
2516                 bssid = req->bss->bssid;
2517                 ieee80211_set_disassoc(sdata, true);
2518         } else list_for_each_entry(wk, &ifmgd->work_list, list) {
2519                 if (&wk->bss->cbss == req->bss) {
2520                         bssid = req->bss->bssid;
2521                         if (wk->state == IEEE80211_MGD_STATE_PROBE)
2522                                 not_auth_yet = true;
2523                         list_del(&wk->list);
2524                         kfree(wk);
2525                         break;
2526                 }
2527         }
2528
2529         /*
2530          * If somebody requests authentication and we haven't
2531          * sent out an auth frame yet there's no need to send
2532          * out a deauth frame either. If the state was PROBE,
2533          * then this is the case. If it's AUTH we have sent a
2534          * frame, and if it's IDLE we have completed the auth
2535          * process already.
2536          */
2537         if (not_auth_yet) {
2538                 mutex_unlock(&ifmgd->mtx);
2539                 __cfg80211_auth_canceled(sdata->dev, bssid);
2540                 return 0;
2541         }
2542
2543         /*
2544          * cfg80211 should catch this ... but it's racy since
2545          * we can receive a deauth frame, process it, hand it
2546          * to cfg80211 while that's in a locked section already
2547          * trying to tell us that the user wants to disconnect.
2548          */
2549         if (!bssid) {
2550                 mutex_unlock(&ifmgd->mtx);
2551                 return -ENOLINK;
2552         }
2553
2554         mutex_unlock(&ifmgd->mtx);
2555
2556         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2557                sdata->dev->name, bssid, req->reason_code);
2558
2559         ieee80211_send_deauth_disassoc(sdata, bssid,
2560                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2561                         cookie);
2562
2563         return 0;
2564 }
2565
2566 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2567                            struct cfg80211_disassoc_request *req,
2568                            void *cookie)
2569 {
2570         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2571
2572         mutex_lock(&ifmgd->mtx);
2573
2574         /*
2575          * cfg80211 should catch this ... but it's racy since
2576          * we can receive a disassoc frame, process it, hand it
2577          * to cfg80211 while that's in a locked section already
2578          * trying to tell us that the user wants to disconnect.
2579          */
2580         if (&ifmgd->associated->cbss != req->bss) {
2581                 mutex_unlock(&ifmgd->mtx);
2582                 return -ENOLINK;
2583         }
2584
2585         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2586                sdata->dev->name, req->bss->bssid, req->reason_code);
2587
2588         ieee80211_set_disassoc(sdata, false);
2589
2590         mutex_unlock(&ifmgd->mtx);
2591
2592         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2593                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2594                         cookie);
2595         return 0;
2596 }