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_ASSOC_SCANS_MAX_TRIES 2
  31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  32 #define IEEE80211_AUTH_MAX_TRIES 3
  33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  34 #define IEEE80211_ASSOC_MAX_TRIES 3
  35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  36 #define IEEE80211_PROBE_WAIT (HZ / 20)
  37 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
  38 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  39
  40 #define TMR_RUNNING_TIMER       0
  41 #define TMR_RUNNING_CHANSW      1
  42
  43 /* utils */
  44 static int ecw2cw(int ecw)
  45 {
  46         return (1 << ecw) - 1;
  47 }
  48
  49 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  50 {
  51         u8 *end, *pos;
  52
  53         pos = bss->cbss.information_elements;
  54         if (pos == NULL)
  55                 return NULL;
  56         end = pos + bss->cbss.len_information_elements;
  57
  58         while (pos + 1 < end) {
  59                 if (pos + 2 + pos[1] > end)
  60                         break;
  61                 if (pos[0] == ie)
  62                         return pos;
  63                 pos += 2 + pos[1];
  64         }
  65
  66         return NULL;
  67 }
  68
  69 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  70                                       struct ieee80211_supported_band *sband,
  71                                       u32 *rates)
  72 {
  73         int i, j, count;
  74         *rates = 0;
  75         count = 0;
  76         for (i = 0; i < bss->supp_rates_len; i++) {
  77                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  78
  79                 for (j = 0; j < sband->n_bitrates; j++)
  80                         if (sband->bitrates[j].bitrate == rate) {
  81                                 *rates |= BIT(j);
  82                                 count++;
  83                                 break;
  84                         }
  85         }
  86
  87         return count;
  88 }
  89
  90 /*
  91  * ieee80211_enable_ht should be called only after the operating band
  92  * has been determined as ht configuration depends on the hw's
  93  * HT abilities for a specific band.
  94  */
  95 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
  96                                struct ieee80211_ht_info *hti,
  97                                u16 ap_ht_cap_flags)
  98 {
  99         struct ieee80211_local *local = sdata->local;
 100         struct ieee80211_supported_band *sband;
 101         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 102         struct sta_info *sta;
 103         u32 changed = 0;
 104         u16 ht_opmode;
 105         bool enable_ht = true, ht_changed;
 106         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 107
 108         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 109
 110         /* HT is not supported */
 111         if (!sband->ht_cap.ht_supported)
 112                 enable_ht = false;
 113
 114         /* check that channel matches the right operating channel */
 115         if (local->hw.conf.channel->center_freq !=
 116             ieee80211_channel_to_frequency(hti->control_chan))
 117                 enable_ht = false;
 118
 119         if (enable_ht) {
 120                 channel_type = NL80211_CHAN_HT20;
 121
 122                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 123                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 124                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 125                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 126                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 127                                 if (!(local->hw.conf.channel->flags &
 128                                     IEEE80211_CHAN_NO_HT40PLUS))
 129                                         channel_type = NL80211_CHAN_HT40PLUS;
 130                                 break;
 131                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 132                                 if (!(local->hw.conf.channel->flags &
 133                                     IEEE80211_CHAN_NO_HT40MINUS))
 134                                         channel_type = NL80211_CHAN_HT40MINUS;
 135                                 break;
 136                         }
 137                 }
 138         }
 139
 140         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 141                      channel_type != local->hw.conf.channel_type;
 142
 143         local->oper_channel_type = channel_type;
 144
 145         if (ht_changed) {
 146                 /* channel_type change automatically detected */
 147                 ieee80211_hw_config(local, 0);
 148
 149                 rcu_read_lock();
 150
 151                 sta = sta_info_get(local, ifmgd->bssid);
 152                 if (sta)
 153                         rate_control_rate_update(local, sband, sta,
 154                                                  IEEE80211_RC_HT_CHANGED);
 155
 156                 rcu_read_unlock();
 157         }
 158
 159         /* disable HT */
 160         if (!enable_ht)
 161                 return 0;
 162
 163         ht_opmode = le16_to_cpu(hti->operation_mode);
 164
 165         /* if bss configuration changed store the new one */
 166         if (!sdata->ht_opmode_valid ||
 167             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 168                 changed |= BSS_CHANGED_HT;
 169                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 170                 sdata->ht_opmode_valid = true;
 171         }
 172
 173         return changed;
 174 }
 175
 176 /* frame sending functions */
 177
 178 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 179 {
 180         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 181         struct ieee80211_local *local = sdata->local;
 182         struct sk_buff *skb;
 183         struct ieee80211_mgmt *mgmt;
 184         u8 *pos, *ies, *ht_ie;
 185         int i, len, count, rates_len, supp_rates_len;
 186         u16 capab;
 187         struct ieee80211_bss *bss;
 188         int wmm = 0;
 189         struct ieee80211_supported_band *sband;
 190         u32 rates = 0;
 191
 192         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 193                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
 194                             ifmgd->ssid_len);
 195         if (!skb) {
 196                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 197                        "frame\n", sdata->dev->name);
 198                 return;
 199         }
 200         skb_reserve(skb, local->hw.extra_tx_headroom);
 201
 202         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 203
 204         capab = ifmgd->capab;
 205
 206         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 207                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 208                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 209                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 210                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 211         }
 212
 213         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 214                                    local->hw.conf.channel->center_freq,
 215                                    ifmgd->ssid, ifmgd->ssid_len);
 216         if (bss) {
 217                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 218                         capab |= WLAN_CAPABILITY_PRIVACY;
 219                 if (bss->wmm_used)
 220                         wmm = 1;
 221
 222                 /* get all rates supported by the device and the AP as
 223                  * some APs don't like getting a superset of their rates
 224                  * in the association request (e.g. D-Link DAP 1353 in
 225                  * b-only mode) */
 226                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 227
 228                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 229                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 230                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 231
 232                 ieee80211_rx_bss_put(local, bss);
 233         } else {
 234                 rates = ~0;
 235                 rates_len = sband->n_bitrates;
 236         }
 237
 238         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 239         memset(mgmt, 0, 24);
 240         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 241         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 242         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 243
 244         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
 245                 skb_put(skb, 10);
 246                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 247                                                   IEEE80211_STYPE_REASSOC_REQ);
 248                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 249                 mgmt->u.reassoc_req.listen_interval =
 250                                 cpu_to_le16(local->hw.conf.listen_interval);
 251                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
 252                        ETH_ALEN);
 253         } else {
 254                 skb_put(skb, 4);
 255                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 256                                                   IEEE80211_STYPE_ASSOC_REQ);
 257                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 258                 mgmt->u.assoc_req.listen_interval =
 259                                 cpu_to_le16(local->hw.conf.listen_interval);
 260         }
 261
 262         /* SSID */
 263         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
 264         *pos++ = WLAN_EID_SSID;
 265         *pos++ = ifmgd->ssid_len;
 266         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
 267
 268         /* add all rates which were marked to be used above */
 269         supp_rates_len = rates_len;
 270         if (supp_rates_len > 8)
 271                 supp_rates_len = 8;
 272
 273         len = sband->n_bitrates;
 274         pos = skb_put(skb, supp_rates_len + 2);
 275         *pos++ = WLAN_EID_SUPP_RATES;
 276         *pos++ = supp_rates_len;
 277
 278         count = 0;
 279         for (i = 0; i < sband->n_bitrates; i++) {
 280                 if (BIT(i) & rates) {
 281                         int rate = sband->bitrates[i].bitrate;
 282                         *pos++ = (u8) (rate / 5);
 283                         if (++count == 8)
 284                                 break;
 285                 }
 286         }
 287
 288         if (rates_len > count) {
 289                 pos = skb_put(skb, rates_len - count + 2);
 290                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 291                 *pos++ = rates_len - count;
 292
 293                 for (i++; i < sband->n_bitrates; i++) {
 294                         if (BIT(i) & rates) {
 295                                 int rate = sband->bitrates[i].bitrate;
 296                                 *pos++ = (u8) (rate / 5);
 297                         }
 298                 }
 299         }
 300
 301         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 302                 /* 1. power capabilities */
 303                 pos = skb_put(skb, 4);
 304                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 305                 *pos++ = 2;
 306                 *pos++ = 0; /* min tx power */
 307                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 308
 309                 /* 2. supported channels */
 310                 /* TODO: get this in reg domain format */
 311                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 312                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 313                 *pos++ = 2 * sband->n_channels;
 314                 for (i = 0; i < sband->n_channels; i++) {
 315                         *pos++ = ieee80211_frequency_to_channel(
 316                                         sband->channels[i].center_freq);
 317                         *pos++ = 1; /* one channel in the subband*/
 318                 }
 319         }
 320
 321         if (ifmgd->extra_ie) {
 322                 pos = skb_put(skb, ifmgd->extra_ie_len);
 323                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
 324         }
 325
 326         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 327                 pos = skb_put(skb, 9);
 328                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 329                 *pos++ = 7; /* len */
 330                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 331                 *pos++ = 0x50;
 332                 *pos++ = 0xf2;
 333                 *pos++ = 2; /* WME */
 334                 *pos++ = 0; /* WME info */
 335                 *pos++ = 1; /* WME ver */
 336                 *pos++ = 0;
 337         }
 338
 339         /* wmm support is a must to HT */
 340         /*
 341          * IEEE802.11n does not allow TKIP/WEP as pairwise
 342          * ciphers in HT mode. We still associate in non-ht
 343          * mode (11a/b/g) if any one of these ciphers is
 344          * configured as pairwise.
 345          */
 346         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 347             sband->ht_cap.ht_supported &&
 348             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 349             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 350             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 351                 struct ieee80211_ht_info *ht_info =
 352                         (struct ieee80211_ht_info *)(ht_ie + 2);
 353                 u16 cap = sband->ht_cap.cap;
 354                 __le16 tmp;
 355                 u32 flags = local->hw.conf.channel->flags;
 356
 357                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 358                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 359                         if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 360                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 361                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 362                         }
 363                         break;
 364                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 365                         if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 366                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 367                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 368                         }
 369                         break;
 370                 }
 371
 372                 tmp = cpu_to_le16(cap);
 373                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 374                 *pos++ = WLAN_EID_HT_CAPABILITY;
 375                 *pos++ = sizeof(struct ieee80211_ht_cap);
 376                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 377                 memcpy(pos, &tmp, sizeof(u16));
 378                 pos += sizeof(u16);
 379                 /* TODO: needs a define here for << 2 */
 380                 *pos++ = sband->ht_cap.ampdu_factor |
 381                          (sband->ht_cap.ampdu_density << 2);
 382                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 383         }
 384
 385         kfree(ifmgd->assocreq_ies);
 386         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
 387         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
 388         if (ifmgd->assocreq_ies)
 389                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
 390
 391         ieee80211_tx_skb(sdata, skb, 0);
 392 }
 393
 394
 395 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 396                                            u16 stype, u16 reason)
 397 {
 398         struct ieee80211_local *local = sdata->local;
 399         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 400         struct sk_buff *skb;
 401         struct ieee80211_mgmt *mgmt;
 402
 403         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 404         if (!skb) {
 405                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 406                        "deauth/disassoc frame\n", sdata->dev->name);
 407                 return;
 408         }
 409         skb_reserve(skb, local->hw.extra_tx_headroom);
 410
 411         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 412         memset(mgmt, 0, 24);
 413         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 414         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 415         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 416         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 417         skb_put(skb, 2);
 418         /* u.deauth.reason_code == u.disassoc.reason_code */
 419         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 420
 421         if (stype == IEEE80211_STYPE_DEAUTH)
 422                 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
 423         else
 424                 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
 425         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 426 }
 427
 428 void ieee80211_send_pspoll(struct ieee80211_local *local,
 429                            struct ieee80211_sub_if_data *sdata)
 430 {
 431         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 432         struct ieee80211_pspoll *pspoll;
 433         struct sk_buff *skb;
 434         u16 fc;
 435
 436         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 437         if (!skb) {
 438                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 439                        "pspoll frame\n", sdata->dev->name);
 440                 return;
 441         }
 442         skb_reserve(skb, local->hw.extra_tx_headroom);
 443
 444         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 445         memset(pspoll, 0, sizeof(*pspoll));
 446         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 447         pspoll->frame_control = cpu_to_le16(fc);
 448         pspoll->aid = cpu_to_le16(ifmgd->aid);
 449
 450         /* aid in PS-Poll has its two MSBs each set to 1 */
 451         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 452
 453         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 454         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 455
 456         ieee80211_tx_skb(sdata, skb, 0);
 457 }
 458
 459 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 460                              struct ieee80211_sub_if_data *sdata,
 461                              int powersave)
 462 {
 463         struct sk_buff *skb;
 464         struct ieee80211_hdr *nullfunc;
 465         __le16 fc;
 466
 467         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 468                 return;
 469
 470         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 471         if (!skb) {
 472                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 473                        "frame\n", sdata->dev->name);
 474                 return;
 475         }
 476         skb_reserve(skb, local->hw.extra_tx_headroom);
 477
 478         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 479         memset(nullfunc, 0, 24);
 480         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 481                          IEEE80211_FCTL_TODS);
 482         if (powersave)
 483                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 484         nullfunc->frame_control = fc;
 485         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 486         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 487         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 488
 489         ieee80211_tx_skb(sdata, skb, 0);
 490 }
 491
 492 /* spectrum management related things */
 493 static void ieee80211_chswitch_work(struct work_struct *work)
 494 {
 495         struct ieee80211_sub_if_data *sdata =
 496                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 497         struct ieee80211_bss *bss;
 498         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 499
 500         if (!netif_running(sdata->dev))
 501                 return;
 502
 503         bss = ieee80211_rx_bss_get(sdata->local, ifmgd->bssid,
 504                                    sdata->local->hw.conf.channel->center_freq,
 505                                    ifmgd->ssid, ifmgd->ssid_len);
 506         if (!bss)
 507                 goto exit;
 508
 509         sdata->local->oper_channel = sdata->local->csa_channel;
 510         /* XXX: shouldn't really modify cfg80211-owned data! */
 511         if (!ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL))
 512                 bss->cbss.channel = sdata->local->oper_channel;
 513
 514         ieee80211_rx_bss_put(sdata->local, bss);
 515 exit:
 516         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 517         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 518                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 519 }
 520
 521 static void ieee80211_chswitch_timer(unsigned long data)
 522 {
 523         struct ieee80211_sub_if_data *sdata =
 524                 (struct ieee80211_sub_if_data *) data;
 525         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 526
 527         if (sdata->local->quiescing) {
 528                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 529                 return;
 530         }
 531
 532         queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
 533 }
 534
 535 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 536                                       struct ieee80211_channel_sw_ie *sw_elem,
 537                                       struct ieee80211_bss *bss)
 538 {
 539         struct ieee80211_channel *new_ch;
 540         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 541         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 542
 543         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATED)
 544                 return;
 545
 546         if (sdata->local->sw_scanning || sdata->local->hw_scanning)
 547                 return;
 548
 549         /* Disregard subsequent beacons if we are already running a timer
 550            processing a CSA */
 551
 552         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 553                 return;
 554
 555         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 556         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 557                 return;
 558
 559         sdata->local->csa_channel = new_ch;
 560
 561         if (sw_elem->count <= 1) {
 562                 queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work);
 563         } else {
 564                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 565                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 566                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 567                 mod_timer(&ifmgd->chswitch_timer,
 568                           jiffies +
 569                           msecs_to_jiffies(sw_elem->count *
 570                                            bss->cbss.beacon_interval));
 571         }
 572 }
 573
 574 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 575                                         u16 capab_info, u8 *pwr_constr_elem,
 576                                         u8 pwr_constr_elem_len)
 577 {
 578         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 579
 580         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 581                 return;
 582
 583         /* Power constraint IE length should be 1 octet */
 584         if (pwr_constr_elem_len != 1)
 585                 return;
 586
 587         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 588             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 589                 sdata->local->power_constr_level = *pwr_constr_elem;
 590                 ieee80211_hw_config(sdata->local, 0);
 591         }
 592 }
 593
 594 /* powersave */
 595 static void ieee80211_enable_ps(struct ieee80211_local *local,
 596                                 struct ieee80211_sub_if_data *sdata)
 597 {
 598         struct ieee80211_conf *conf = &local->hw.conf;
 599
 600         /*
 601          * If we are scanning right now then the parameters will
 602          * take effect when scan finishes.
 603          */
 604         if (local->hw_scanning || local->sw_scanning)
 605                 return;
 606
 607         if (conf->dynamic_ps_timeout > 0 &&
 608             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 609                 mod_timer(&local->dynamic_ps_timer, jiffies +
 610                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 611         } else {
 612                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 613                         ieee80211_send_nullfunc(local, sdata, 1);
 614                 conf->flags |= IEEE80211_CONF_PS;
 615                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 616         }
 617 }
 618
 619 static void ieee80211_change_ps(struct ieee80211_local *local)
 620 {
 621         struct ieee80211_conf *conf = &local->hw.conf;
 622
 623         if (local->ps_sdata) {
 624                 if (!(local->ps_sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED))
 625                         return;
 626
 627                 ieee80211_enable_ps(local, local->ps_sdata);
 628         } else if (conf->flags & IEEE80211_CONF_PS) {
 629                 conf->flags &= ~IEEE80211_CONF_PS;
 630                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 631                 del_timer_sync(&local->dynamic_ps_timer);
 632                 cancel_work_sync(&local->dynamic_ps_enable_work);
 633         }
 634 }
 635
 636 /* need to hold RTNL or interface lock */
 637 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 638 {
 639         struct ieee80211_sub_if_data *sdata, *found = NULL;
 640         int count = 0;
 641
 642         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 643                 local->ps_sdata = NULL;
 644                 return;
 645         }
 646
 647         list_for_each_entry(sdata, &local->interfaces, list) {
 648                 if (!netif_running(sdata->dev))
 649                         continue;
 650                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 651                         continue;
 652                 found = sdata;
 653                 count++;
 654         }
 655
 656         if (count == 1 && found->u.mgd.powersave) {
 657                 s32 beaconint_us;
 658
 659                 if (latency < 0)
 660                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 661
 662                 beaconint_us = ieee80211_tu_to_usec(
 663                                         found->vif.bss_conf.beacon_int);
 664
 665                 if (beaconint_us > latency) {
 666                         local->ps_sdata = NULL;
 667                 } else {
 668                         u8 dtimper = found->vif.bss_conf.dtim_period;
 669                         int maxslp = 1;
 670
 671                         if (dtimper > 1)
 672                                 maxslp = min_t(int, dtimper,
 673                                                     latency / beaconint_us);
 674
 675                         local->hw.conf.max_sleep_period = maxslp;
 676                         local->ps_sdata = found;
 677                 }
 678         } else {
 679                 local->ps_sdata = NULL;
 680         }
 681
 682         ieee80211_change_ps(local);
 683 }
 684
 685 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 686 {
 687         struct ieee80211_local *local =
 688                 container_of(work, struct ieee80211_local,
 689                              dynamic_ps_disable_work);
 690
 691         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 692                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 693                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 694         }
 695
 696         ieee80211_wake_queues_by_reason(&local->hw,
 697                                         IEEE80211_QUEUE_STOP_REASON_PS);
 698 }
 699
 700 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 701 {
 702         struct ieee80211_local *local =
 703                 container_of(work, struct ieee80211_local,
 704                              dynamic_ps_enable_work);
 705         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 706
 707         /* can only happen when PS was just disabled anyway */
 708         if (!sdata)
 709                 return;
 710
 711         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 712                 return;
 713
 714         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 715                 ieee80211_send_nullfunc(local, sdata, 1);
 716
 717         local->hw.conf.flags |= IEEE80211_CONF_PS;
 718         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 719 }
 720
 721 void ieee80211_dynamic_ps_timer(unsigned long data)
 722 {
 723         struct ieee80211_local *local = (void *) data;
 724
 725         if (local->quiescing)
 726                 return;
 727
 728         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
 729 }
 730
 731 /* MLME */
 732 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 733                                      struct ieee80211_if_managed *ifmgd,
 734                                      u8 *wmm_param, size_t wmm_param_len)
 735 {
 736         struct ieee80211_tx_queue_params params;
 737         size_t left;
 738         int count;
 739         u8 *pos;
 740
 741         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 742                 return;
 743
 744         if (!wmm_param)
 745                 return;
 746
 747         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 748                 return;
 749         count = wmm_param[6] & 0x0f;
 750         if (count == ifmgd->wmm_last_param_set)
 751                 return;
 752         ifmgd->wmm_last_param_set = count;
 753
 754         pos = wmm_param + 8;
 755         left = wmm_param_len - 8;
 756
 757         memset(&params, 0, sizeof(params));
 758
 759         local->wmm_acm = 0;
 760         for (; left >= 4; left -= 4, pos += 4) {
 761                 int aci = (pos[0] >> 5) & 0x03;
 762                 int acm = (pos[0] >> 4) & 0x01;
 763                 int queue;
 764
 765                 switch (aci) {
 766                 case 1: /* AC_BK */
 767                         queue = 3;
 768                         if (acm)
 769                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 770                         break;
 771                 case 2: /* AC_VI */
 772                         queue = 1;
 773                         if (acm)
 774                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 775                         break;
 776                 case 3: /* AC_VO */
 777                         queue = 0;
 778                         if (acm)
 779                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 780                         break;
 781                 case 0: /* AC_BE */
 782                 default:
 783                         queue = 2;
 784                         if (acm)
 785                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 786                         break;
 787                 }
 788
 789                 params.aifs = pos[0] & 0x0f;
 790                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 791                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 792                 params.txop = get_unaligned_le16(pos + 2);
 793 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 794                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 795                        "cWmin=%d cWmax=%d txop=%d\n",
 796                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 797                        params.cw_max, params.txop);
 798 #endif
 799                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 800                         printk(KERN_DEBUG "%s: failed to set TX queue "
 801                                "parameters for queue %d\n", local->mdev->name,
 802                                queue);
 803         }
 804 }
 805
 806 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 807                                            u16 capab, bool erp_valid, u8 erp)
 808 {
 809         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 810 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 811         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 812 #endif
 813         u32 changed = 0;
 814         bool use_protection;
 815         bool use_short_preamble;
 816         bool use_short_slot;
 817
 818         if (erp_valid) {
 819                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 820                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 821         } else {
 822                 use_protection = false;
 823                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 824         }
 825
 826         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 827
 828         if (use_protection != bss_conf->use_cts_prot) {
 829 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 830                 if (net_ratelimit()) {
 831                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 832                                sdata->dev->name,
 833                                use_protection ? "enabled" : "disabled",
 834                                ifmgd->bssid);
 835                 }
 836 #endif
 837                 bss_conf->use_cts_prot = use_protection;
 838                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 839         }
 840
 841         if (use_short_preamble != bss_conf->use_short_preamble) {
 842 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 843                 if (net_ratelimit()) {
 844                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 845                                " (BSSID=%pM)\n",
 846                                sdata->dev->name,
 847                                use_short_preamble ? "short" : "long",
 848                                ifmgd->bssid);
 849                 }
 850 #endif
 851                 bss_conf->use_short_preamble = use_short_preamble;
 852                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 853         }
 854
 855         if (use_short_slot != bss_conf->use_short_slot) {
 856 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 857                 if (net_ratelimit()) {
 858                         printk(KERN_DEBUG "%s: switched to %s slot time"
 859                                " (BSSID=%pM)\n",
 860                                sdata->dev->name,
 861                                use_short_slot ? "short" : "long",
 862                                ifmgd->bssid);
 863                 }
 864 #endif
 865                 bss_conf->use_short_slot = use_short_slot;
 866                 changed |= BSS_CHANGED_ERP_SLOT;
 867         }
 868
 869         return changed;
 870 }
 871
 872 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 873 {
 874         union iwreq_data wrqu;
 875
 876         memset(&wrqu, 0, sizeof(wrqu));
 877         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 878                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 879         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 880         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 881 }
 882
 883 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 884 {
 885         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 886         char *buf;
 887         size_t len;
 888         int i;
 889         union iwreq_data wrqu;
 890
 891         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 892                 return;
 893
 894         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 895                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 896         if (!buf)
 897                 return;
 898
 899         len = sprintf(buf, "ASSOCINFO(");
 900         if (ifmgd->assocreq_ies) {
 901                 len += sprintf(buf + len, "ReqIEs=");
 902                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 903                         len += sprintf(buf + len, "%02x",
 904                                        ifmgd->assocreq_ies[i]);
 905                 }
 906         }
 907         if (ifmgd->assocresp_ies) {
 908                 if (ifmgd->assocreq_ies)
 909                         len += sprintf(buf + len, " ");
 910                 len += sprintf(buf + len, "RespIEs=");
 911                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 912                         len += sprintf(buf + len, "%02x",
 913                                        ifmgd->assocresp_ies[i]);
 914                 }
 915         }
 916         len += sprintf(buf + len, ")");
 917
 918         if (len > IW_CUSTOM_MAX) {
 919                 len = sprintf(buf, "ASSOCRESPIE=");
 920                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 921                         len += sprintf(buf + len, "%02x",
 922                                        ifmgd->assocresp_ies[i]);
 923                 }
 924         }
 925
 926         if (len <= IW_CUSTOM_MAX) {
 927                 memset(&wrqu, 0, sizeof(wrqu));
 928                 wrqu.data.length = len;
 929                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 930         }
 931
 932         kfree(buf);
 933 }
 934
 935
 936 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 937                                      u32 bss_info_changed)
 938 {
 939         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 940         struct ieee80211_local *local = sdata->local;
 941         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 942
 943         struct ieee80211_bss *bss;
 944
 945         bss_info_changed |= BSS_CHANGED_ASSOC;
 946         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 947
 948         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 949                                    conf->channel->center_freq,
 950                                    ifmgd->ssid, ifmgd->ssid_len);
 951         if (bss) {
 952                 /* set timing information */
 953                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 954                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 955                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 956
 957                 bss_info_changed |= BSS_CHANGED_BEACON_INT;
 958                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 959                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 960
 961                 cfg80211_hold_bss(&bss->cbss);
 962
 963                 ieee80211_rx_bss_put(local, bss);
 964         }
 965
 966         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 967         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 968         ieee80211_sta_send_associnfo(sdata);
 969
 970         ifmgd->last_probe = jiffies;
 971         ieee80211_led_assoc(local, 1);
 972
 973         sdata->vif.bss_conf.assoc = 1;
 974         /*
 975          * For now just always ask the driver to update the basic rateset
 976          * when we have associated, we aren't checking whether it actually
 977          * changed or not.
 978          */
 979         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 980         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 981
 982         /* will be same as sdata */
 983         if (local->ps_sdata) {
 984                 mutex_lock(&local->iflist_mtx);
 985                 ieee80211_recalc_ps(local, -1);
 986                 mutex_unlock(&local->iflist_mtx);
 987         }
 988
 989         netif_tx_start_all_queues(sdata->dev);
 990         netif_carrier_on(sdata->dev);
 991
 992         ieee80211_sta_send_apinfo(sdata);
 993 }
 994
 995 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 996 {
 997         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 998         struct ieee80211_local *local = sdata->local;
 999
1000         ifmgd->direct_probe_tries++;
1001         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
1002                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
1003                        sdata->dev->name, ifmgd->bssid);
1004                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1005                 ieee80211_recalc_idle(local);
1006                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
1007
1008                 /*
1009                  * Most likely AP is not in the range so remove the
1010                  * bss information associated to the AP
1011                  */
1012                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1013                                 sdata->local->hw.conf.channel->center_freq,
1014                                 ifmgd->ssid, ifmgd->ssid_len);
1015
1016                 /*
1017                  * We might have a pending scan which had no chance to run yet
1018                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
1019                  * Hence, queue the STAs work again
1020                  */
1021                 queue_work(local->hw.workqueue, &ifmgd->work);
1022                 return;
1023         }
1024
1025         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
1026                         sdata->dev->name, ifmgd->bssid,
1027                         ifmgd->direct_probe_tries);
1028
1029         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1030
1031         /* Direct probe is sent to broadcast address as some APs
1032          * will not answer to direct packet in unassociated state.
1033          */
1034         ieee80211_send_probe_req(sdata, NULL,
1035                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
1036
1037         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
1038 }
1039
1040
1041 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
1042 {
1043         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1044         struct ieee80211_local *local = sdata->local;
1045         u8 *ies;
1046         size_t ies_len;
1047
1048         ifmgd->auth_tries++;
1049         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
1050                 printk(KERN_DEBUG "%s: authentication with AP %pM"
1051                        " timed out\n",
1052                        sdata->dev->name, ifmgd->bssid);
1053                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1054                 ieee80211_recalc_idle(local);
1055                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
1056                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1057                                 sdata->local->hw.conf.channel->center_freq,
1058                                 ifmgd->ssid, ifmgd->ssid_len);
1059
1060                 /*
1061                  * We might have a pending scan which had no chance to run yet
1062                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
1063                  * Hence, queue the STAs work again
1064                  */
1065                 queue_work(local->hw.workqueue, &ifmgd->work);
1066                 return;
1067         }
1068
1069         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1070         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
1071                sdata->dev->name, ifmgd->bssid);
1072
1073         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1074                 ies = ifmgd->sme_auth_ie;
1075                 ies_len = ifmgd->sme_auth_ie_len;
1076         } else {
1077                 ies = NULL;
1078                 ies_len = 0;
1079         }
1080         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
1081                             ifmgd->bssid, 0);
1082         ifmgd->auth_transaction = 2;
1083
1084         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
1085 }
1086
1087 /*
1088  * The disassoc 'reason' argument can be either our own reason
1089  * if self disconnected or a reason code from the AP.
1090  */
1091 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1092                                    bool deauth, bool self_disconnected,
1093                                    u16 reason)
1094 {
1095         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1096         struct ieee80211_local *local = sdata->local;
1097         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
1098         struct ieee80211_bss *bss;
1099         struct sta_info *sta;
1100         u32 changed = 0, config_changed = 0;
1101
1102         rcu_read_lock();
1103
1104         sta = sta_info_get(local, ifmgd->bssid);
1105         if (!sta) {
1106                 rcu_read_unlock();
1107                 return;
1108         }
1109
1110         if (deauth) {
1111                 ifmgd->direct_probe_tries = 0;
1112                 ifmgd->auth_tries = 0;
1113         }
1114         ifmgd->assoc_scan_tries = 0;
1115         ifmgd->assoc_tries = 0;
1116
1117         netif_tx_stop_all_queues(sdata->dev);
1118         netif_carrier_off(sdata->dev);
1119
1120         ieee80211_sta_tear_down_BA_sessions(sta);
1121
1122         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1123                                    conf->channel->center_freq,
1124                                    ifmgd->ssid, ifmgd->ssid_len);
1125
1126         if (bss) {
1127                 cfg80211_unhold_bss(&bss->cbss);
1128                 ieee80211_rx_bss_put(local, bss);
1129         }
1130
1131         if (self_disconnected) {
1132                 if (deauth)
1133                         ieee80211_send_deauth_disassoc(sdata,
1134                                 IEEE80211_STYPE_DEAUTH, reason);
1135                 else
1136                         ieee80211_send_deauth_disassoc(sdata,
1137                                 IEEE80211_STYPE_DISASSOC, reason);
1138         }
1139
1140         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1141         changed |= ieee80211_reset_erp_info(sdata);
1142
1143         ieee80211_led_assoc(local, 0);
1144         changed |= BSS_CHANGED_ASSOC;
1145         sdata->vif.bss_conf.assoc = false;
1146
1147         ieee80211_sta_send_apinfo(sdata);
1148
1149         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1150                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1151                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1152                                 sdata->local->hw.conf.channel->center_freq,
1153                                 ifmgd->ssid, ifmgd->ssid_len);
1154         }
1155
1156         rcu_read_unlock();
1157
1158         ieee80211_set_wmm_default(sdata);
1159
1160         ieee80211_recalc_idle(local);
1161
1162         /* channel(_type) changes are handled by ieee80211_hw_config */
1163         local->oper_channel_type = NL80211_CHAN_NO_HT;
1164
1165         /* on the next assoc, re-program HT parameters */
1166         sdata->ht_opmode_valid = false;
1167
1168         local->power_constr_level = 0;
1169
1170         del_timer_sync(&local->dynamic_ps_timer);
1171         cancel_work_sync(&local->dynamic_ps_enable_work);
1172
1173         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1174                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1175                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1176         }
1177
1178         ieee80211_hw_config(local, config_changed);
1179         ieee80211_bss_info_change_notify(sdata, changed);
1180
1181         rcu_read_lock();
1182
1183         sta = sta_info_get(local, ifmgd->bssid);
1184         if (!sta) {
1185                 rcu_read_unlock();
1186                 return;
1187         }
1188
1189         sta_info_unlink(&sta);
1190
1191         rcu_read_unlock();
1192
1193         sta_info_destroy(sta);
1194 }
1195
1196 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1197 {
1198         if (!sdata || !sdata->default_key ||
1199             sdata->default_key->conf.alg != ALG_WEP)
1200                 return 0;
1201         return 1;
1202 }
1203
1204 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
1205 {
1206         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1207         struct ieee80211_local *local = sdata->local;
1208         struct ieee80211_bss *bss;
1209         int bss_privacy;
1210         int wep_privacy;
1211         int privacy_invoked;
1212
1213         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
1214                 return 0;
1215
1216         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1217                                    local->hw.conf.channel->center_freq,
1218                                    ifmgd->ssid, ifmgd->ssid_len);
1219         if (!bss)
1220                 return 0;
1221
1222         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1223         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1224         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
1225
1226         ieee80211_rx_bss_put(local, bss);
1227
1228         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1229                 return 0;
1230
1231         return 1;
1232 }
1233
1234 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
1235 {
1236         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1237         struct ieee80211_local *local = sdata->local;
1238
1239         ifmgd->assoc_tries++;
1240         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1241                 printk(KERN_DEBUG "%s: association with AP %pM"
1242                        " timed out\n",
1243                        sdata->dev->name, ifmgd->bssid);
1244                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1245                 ieee80211_recalc_idle(local);
1246                 cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid);
1247                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1248                                 sdata->local->hw.conf.channel->center_freq,
1249                                 ifmgd->ssid, ifmgd->ssid_len);
1250                 /*
1251                  * We might have a pending scan which had no chance to run yet
1252                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1253                  * Hence, queue the STAs work again
1254                  */
1255                 queue_work(local->hw.workqueue, &ifmgd->work);
1256                 return;
1257         }
1258
1259         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1260         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1261                sdata->dev->name, ifmgd->bssid);
1262         if (ieee80211_privacy_mismatch(sdata)) {
1263                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1264                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1265                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1266                 ieee80211_recalc_idle(local);
1267                 return;
1268         }
1269
1270         ieee80211_send_assoc(sdata);
1271
1272         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1273 }
1274
1275 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1276                              struct ieee80211_hdr *hdr)
1277 {
1278         /*
1279          * We can postpone the mgd.timer whenever receiving unicast frames
1280          * from AP because we know that the connection is working both ways
1281          * at that time. But multicast frames (and hence also beacons) must
1282          * be ignored here, because we need to trigger the timer during
1283          * data idle periods for sending the periodical probe request to
1284          * the AP.
1285          */
1286         if (!is_multicast_ether_addr(hdr->addr1))
1287                 mod_timer(&sdata->u.mgd.timer,
1288                           jiffies + IEEE80211_MONITORING_INTERVAL);
1289 }
1290
1291 void ieee80211_beacon_loss_work(struct work_struct *work)
1292 {
1293         struct ieee80211_sub_if_data *sdata =
1294                 container_of(work, struct ieee80211_sub_if_data,
1295                              u.mgd.beacon_loss_work);
1296         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1297
1298         /*
1299          * The driver has already reported this event and we have
1300          * already sent a probe request. Maybe the AP died and the
1301          * driver keeps reporting until we disassociate... We have
1302          * to ignore that because otherwise we would continually
1303          * reset the timer and never check whether we received a
1304          * probe response!
1305          */
1306         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1307                 return;
1308
1309 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1310         if (net_ratelimit()) {
1311                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1312                        "- sending probe request\n", sdata->dev->name,
1313                        sdata->u.mgd.bssid);
1314         }
1315 #endif
1316
1317         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1318         ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1319                                  ifmgd->ssid_len, NULL, 0);
1320
1321         mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1322 }
1323
1324 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1325 {
1326         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1327
1328         queue_work(sdata->local->hw.workqueue,
1329                    &sdata->u.mgd.beacon_loss_work);
1330 }
1331 EXPORT_SYMBOL(ieee80211_beacon_loss);
1332
1333 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1334 {
1335         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1336         struct ieee80211_local *local = sdata->local;
1337         struct sta_info *sta;
1338         bool disassoc = false;
1339
1340         /* TODO: start monitoring current AP signal quality and number of
1341          * missed beacons. Scan other channels every now and then and search
1342          * for better APs. */
1343         /* TODO: remove expired BSSes */
1344
1345         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1346
1347         rcu_read_lock();
1348
1349         sta = sta_info_get(local, ifmgd->bssid);
1350         if (!sta) {
1351                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1352                        sdata->dev->name, ifmgd->bssid);
1353                 disassoc = true;
1354                 goto unlock;
1355         }
1356
1357         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1358             time_after(jiffies, sta->last_rx + IEEE80211_PROBE_WAIT)) {
1359                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1360                        "- disassociating\n",
1361                        sdata->dev->name, ifmgd->bssid);
1362                 disassoc = true;
1363                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1364                 goto unlock;
1365         }
1366
1367         /*
1368          * Beacon filtering is only enabled with power save and then the
1369          * stack should not check for beacon loss.
1370          */
1371         if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1372               (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1373             time_after(jiffies,
1374                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1375 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1376                 if (net_ratelimit()) {
1377                         printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1378                                "- sending probe request\n",
1379                                sdata->dev->name, ifmgd->bssid);
1380                 }
1381 #endif
1382                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1383                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1384                                          ifmgd->ssid_len, NULL, 0);
1385                 goto unlock;
1386
1387         }
1388
1389         if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1390                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1391                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1392                                          ifmgd->ssid_len, NULL, 0);
1393         }
1394
1395  unlock:
1396         rcu_read_unlock();
1397
1398         if (disassoc)
1399                 ieee80211_set_disassoc(sdata, true, true,
1400                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1401         else
1402                 mod_timer(&ifmgd->timer, jiffies +
1403                                       IEEE80211_MONITORING_INTERVAL);
1404 }
1405
1406
1407 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1408 {
1409         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1410
1411         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1412         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1413         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1414                 /* Wait for SME to request association */
1415                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1416                 ieee80211_recalc_idle(sdata->local);
1417         } else
1418                 ieee80211_associate(sdata);
1419 }
1420
1421
1422 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1423                                      struct ieee80211_mgmt *mgmt,
1424                                      size_t len)
1425 {
1426         u8 *pos;
1427         struct ieee802_11_elems elems;
1428
1429         pos = mgmt->u.auth.variable;
1430         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1431         if (!elems.challenge)
1432                 return;
1433         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1434                             elems.challenge - 2, elems.challenge_len + 2,
1435                             sdata->u.mgd.bssid, 1);
1436         sdata->u.mgd.auth_transaction = 4;
1437 }
1438
1439 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1440                                    struct ieee80211_mgmt *mgmt,
1441                                    size_t len)
1442 {
1443         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1444         u16 auth_alg, auth_transaction, status_code;
1445
1446         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1447                 return;
1448
1449         if (len < 24 + 6)
1450                 return;
1451
1452         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1453                 return;
1454
1455         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1456                 return;
1457
1458         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1459         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1460         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1461
1462         if (auth_alg != ifmgd->auth_alg ||
1463             auth_transaction != ifmgd->auth_transaction)
1464                 return;
1465
1466         if (status_code != WLAN_STATUS_SUCCESS) {
1467                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1468                         u8 algs[3];
1469                         const int num_algs = ARRAY_SIZE(algs);
1470                         int i, pos;
1471                         algs[0] = algs[1] = algs[2] = 0xff;
1472                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1473                                 algs[0] = WLAN_AUTH_OPEN;
1474                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1475                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1476                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1477                                 algs[2] = WLAN_AUTH_LEAP;
1478                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1479                                 pos = 0;
1480                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1481                                 pos = 1;
1482                         else
1483                                 pos = 2;
1484                         for (i = 0; i < num_algs; i++) {
1485                                 pos++;
1486                                 if (pos >= num_algs)
1487                                         pos = 0;
1488                                 if (algs[pos] == ifmgd->auth_alg ||
1489                                     algs[pos] == 0xff)
1490                                         continue;
1491                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1492                                     !ieee80211_sta_wep_configured(sdata))
1493                                         continue;
1494                                 ifmgd->auth_alg = algs[pos];
1495                                 break;
1496                         }
1497                 }
1498                 return;
1499         }
1500
1501         switch (ifmgd->auth_alg) {
1502         case WLAN_AUTH_OPEN:
1503         case WLAN_AUTH_LEAP:
1504         case WLAN_AUTH_FT:
1505                 ieee80211_auth_completed(sdata);
1506                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1507                 break;
1508         case WLAN_AUTH_SHARED_KEY:
1509                 if (ifmgd->auth_transaction == 4) {
1510                         ieee80211_auth_completed(sdata);
1511                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1512                 } else
1513                         ieee80211_auth_challenge(sdata, mgmt, len);
1514                 break;
1515         }
1516 }
1517
1518
1519 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1520                                      struct ieee80211_mgmt *mgmt,
1521                                      size_t len)
1522 {
1523         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1524         u16 reason_code;
1525
1526         if (len < 24 + 2)
1527                 return;
1528
1529         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1530                 return;
1531
1532         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1533
1534         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1535                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1536                                 sdata->dev->name, reason_code);
1537
1538         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1539             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1540              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1541              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1542                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1543                 mod_timer(&ifmgd->timer, jiffies +
1544                                       IEEE80211_RETRY_AUTH_INTERVAL);
1545         }
1546
1547         ieee80211_set_disassoc(sdata, true, false, 0);
1548         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1549         cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1550 }
1551
1552
1553 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1554                                        struct ieee80211_mgmt *mgmt,
1555                                        size_t len)
1556 {
1557         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1558         u16 reason_code;
1559
1560         if (len < 24 + 2)
1561                 return;
1562
1563         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1564                 return;
1565
1566         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1567
1568         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1569                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1570                                 sdata->dev->name, reason_code);
1571
1572         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1573             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1574                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1575                 mod_timer(&ifmgd->timer, jiffies +
1576                                       IEEE80211_RETRY_AUTH_INTERVAL);
1577         }
1578
1579         ieee80211_set_disassoc(sdata, false, false, reason_code);
1580         cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1581 }
1582
1583
1584 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1585                                          struct ieee80211_mgmt *mgmt,
1586                                          size_t len,
1587                                          int reassoc)
1588 {
1589         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1590         struct ieee80211_local *local = sdata->local;
1591         struct ieee80211_supported_band *sband;
1592         struct sta_info *sta;
1593         u32 rates, basic_rates;
1594         u16 capab_info, status_code, aid;
1595         struct ieee802_11_elems elems;
1596         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1597         u8 *pos;
1598         u32 changed = 0;
1599         int i, j;
1600         bool have_higher_than_11mbit = false, newsta = false;
1601         u16 ap_ht_cap_flags;
1602
1603         /* AssocResp and ReassocResp have identical structure, so process both
1604          * of them in this function. */
1605
1606         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1607                 return;
1608
1609         if (len < 24 + 6)
1610                 return;
1611
1612         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1613                 return;
1614
1615         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1616         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1617         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1618
1619         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1620                "status=%d aid=%d)\n",
1621                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1622                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1623
1624         pos = mgmt->u.assoc_resp.variable;
1625         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1626
1627         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1628             elems.timeout_int && elems.timeout_int_len == 5 &&
1629             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1630                 u32 tu, ms;
1631                 tu = get_unaligned_le32(elems.timeout_int + 1);
1632                 ms = tu * 1024 / 1000;
1633                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1634                        "comeback duration %u TU (%u ms)\n",
1635                        sdata->dev->name, tu, ms);
1636                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1637                         mod_timer(&ifmgd->timer,
1638                                   jiffies + msecs_to_jiffies(ms));
1639                 return;
1640         }
1641
1642         if (status_code != WLAN_STATUS_SUCCESS) {
1643                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1644                        sdata->dev->name, status_code);
1645                 /* if this was a reassociation, ensure we try a "full"
1646                  * association next time. This works around some broken APs
1647                  * which do not correctly reject reassociation requests. */
1648                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1649                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1650                 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1651                         /* Wait for SME to decide what to do next */
1652                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1653                         ieee80211_recalc_idle(local);
1654                 }
1655                 return;
1656         }
1657
1658         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1659                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1660                        "set\n", sdata->dev->name, aid);
1661         aid &= ~(BIT(15) | BIT(14));
1662
1663         if (!elems.supp_rates) {
1664                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1665                        sdata->dev->name);
1666                 return;
1667         }
1668
1669         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1670         ifmgd->aid = aid;
1671         ifmgd->ap_capab = capab_info;
1672
1673         kfree(ifmgd->assocresp_ies);
1674         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1675         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1676         if (ifmgd->assocresp_ies)
1677                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1678
1679         rcu_read_lock();
1680
1681         /* Add STA entry for the AP */
1682         sta = sta_info_get(local, ifmgd->bssid);
1683         if (!sta) {
1684                 newsta = true;
1685
1686                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1687                 if (!sta) {
1688                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1689                                " the AP\n", sdata->dev->name);
1690                         rcu_read_unlock();
1691                         return;
1692                 }
1693
1694                 /* update new sta with its last rx activity */
1695                 sta->last_rx = jiffies;
1696         }
1697
1698         /*
1699          * FIXME: Do we really need to update the sta_info's information here?
1700          *        We already know about the AP (we found it in our list) so it
1701          *        should already be filled with the right info, no?
1702          *        As is stands, all this is racy because typically we assume
1703          *        the information that is filled in here (except flags) doesn't
1704          *        change while a STA structure is alive. As such, it should move
1705          *        to between the sta_info_alloc() and sta_info_insert() above.
1706          */
1707
1708         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP);
1709         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1710                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1711
1712         rates = 0;
1713         basic_rates = 0;
1714         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1715
1716         for (i = 0; i < elems.supp_rates_len; i++) {
1717                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1718                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1719
1720                 if (rate > 110)
1721                         have_higher_than_11mbit = true;
1722
1723                 for (j = 0; j < sband->n_bitrates; j++) {
1724                         if (sband->bitrates[j].bitrate == rate) {
1725                                 rates |= BIT(j);
1726                                 if (is_basic)
1727                                         basic_rates |= BIT(j);
1728                                 break;
1729                         }
1730                 }
1731         }
1732
1733         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1734                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1735                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1736
1737                 if (rate > 110)
1738                         have_higher_than_11mbit = true;
1739
1740                 for (j = 0; j < sband->n_bitrates; j++) {
1741                         if (sband->bitrates[j].bitrate == rate) {
1742                                 rates |= BIT(j);
1743                                 if (is_basic)
1744                                         basic_rates |= BIT(j);
1745                                 break;
1746                         }
1747                 }
1748         }
1749
1750         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1751         sdata->vif.bss_conf.basic_rates = basic_rates;
1752
1753         /* cf. IEEE 802.11 9.2.12 */
1754         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1755             have_higher_than_11mbit)
1756                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1757         else
1758                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1759
1760         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1761         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1762                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1763                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1764
1765         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1766
1767         rate_control_rate_init(sta);
1768
1769         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1770                 set_sta_flags(sta, WLAN_STA_MFP);
1771
1772         if (elems.wmm_param)
1773                 set_sta_flags(sta, WLAN_STA_WME);
1774
1775         if (newsta) {
1776                 int err = sta_info_insert(sta);
1777                 if (err) {
1778                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1779                                " the AP (error %d)\n", sdata->dev->name, err);
1780                         rcu_read_unlock();
1781                         return;
1782                 }
1783         }
1784
1785         rcu_read_unlock();
1786
1787         if (elems.wmm_param)
1788                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1789                                          elems.wmm_param_len);
1790         else
1791                 ieee80211_set_wmm_default(sdata);
1792
1793         if (elems.ht_info_elem && elems.wmm_param &&
1794             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1795             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1796                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1797                                                ap_ht_cap_flags);
1798
1799         /* set AID and assoc capability,
1800          * ieee80211_set_associated() will tell the driver */
1801         bss_conf->aid = aid;
1802         bss_conf->assoc_capability = capab_info;
1803         ieee80211_set_associated(sdata, changed);
1804
1805         /*
1806          * initialise the time of last beacon to be the association time,
1807          * otherwise beacon loss check will trigger immediately
1808          */
1809         ifmgd->last_beacon = jiffies;
1810
1811         ieee80211_associated(sdata);
1812         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1813 }
1814
1815
1816 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1817                                   struct ieee80211_mgmt *mgmt,
1818                                   size_t len,
1819                                   struct ieee80211_rx_status *rx_status,
1820                                   struct ieee802_11_elems *elems,
1821                                   bool beacon)
1822 {
1823         struct ieee80211_local *local = sdata->local;
1824         int freq;
1825         struct ieee80211_bss *bss;
1826         struct ieee80211_channel *channel;
1827
1828         if (elems->ds_params && elems->ds_params_len == 1)
1829                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1830         else
1831                 freq = rx_status->freq;
1832
1833         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1834
1835         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1836                 return;
1837
1838         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1839                                         channel, beacon);
1840         if (!bss)
1841                 return;
1842
1843         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1844             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1845                 struct ieee80211_channel_sw_ie *sw_elem =
1846                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1847                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1848         }
1849
1850         ieee80211_rx_bss_put(local, bss);
1851 }
1852
1853
1854 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1855                                          struct ieee80211_mgmt *mgmt,
1856                                          size_t len,
1857                                          struct ieee80211_rx_status *rx_status)
1858 {
1859         struct ieee80211_if_managed *ifmgd;
1860         size_t baselen;
1861         struct ieee802_11_elems elems;
1862
1863         ifmgd = &sdata->u.mgd;
1864
1865         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1866                 return; /* ignore ProbeResp to foreign address */
1867
1868         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1869         if (baselen > len)
1870                 return;
1871
1872         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1873                                 &elems);
1874
1875         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1876
1877         /* direct probe may be part of the association flow */
1878         if (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE) {
1879                 printk(KERN_DEBUG "%s direct probe responded\n",
1880                        sdata->dev->name);
1881                 ieee80211_authenticate(sdata);
1882         }
1883
1884         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1885                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1886 }
1887
1888 /*
1889  * This is the canonical list of information elements we care about,
1890  * the filter code also gives us all changes to the Microsoft OUI
1891  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1892  *
1893  * We implement beacon filtering in software since that means we can
1894  * avoid processing the frame here and in cfg80211, and userspace
1895  * will not be able to tell whether the hardware supports it or not.
1896  *
1897  * XXX: This list needs to be dynamic -- userspace needs to be able to
1898  *      add items it requires. It also needs to be able to tell us to
1899  *      look out for other vendor IEs.
1900  */
1901 static const u64 care_about_ies =
1902         (1ULL << WLAN_EID_COUNTRY) |
1903         (1ULL << WLAN_EID_ERP_INFO) |
1904         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1905         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1906         (1ULL << WLAN_EID_HT_CAPABILITY) |
1907         (1ULL << WLAN_EID_HT_INFORMATION);
1908
1909 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1910                                      struct ieee80211_mgmt *mgmt,
1911                                      size_t len,
1912                                      struct ieee80211_rx_status *rx_status)
1913 {
1914         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1915         size_t baselen;
1916         struct ieee802_11_elems elems;
1917         struct ieee80211_local *local = sdata->local;
1918         u32 changed = 0;
1919         bool erp_valid, directed_tim = false;
1920         u8 erp_value = 0;
1921         u32 ncrc;
1922
1923         /* Process beacon from the current BSS */
1924         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1925         if (baselen > len)
1926                 return;
1927
1928         if (rx_status->freq != local->hw.conf.channel->center_freq)
1929                 return;
1930
1931         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1932             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1933                 return;
1934
1935         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1936 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1937                 if (net_ratelimit()) {
1938                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1939                                "to a received beacon\n", sdata->dev->name);
1940                 }
1941 #endif
1942                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1943         }
1944
1945         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1946         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1947                                           len - baselen, &elems,
1948                                           care_about_ies, ncrc);
1949
1950         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1951                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1952                                                    ifmgd->aid);
1953
1954         ncrc = crc32_be(ncrc, (void *)&directed_tim, sizeof(directed_tim));
1955
1956         if (ncrc == ifmgd->beacon_crc)
1957                 return;
1958         ifmgd->beacon_crc = ncrc;
1959
1960         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1961
1962         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1963                                  elems.wmm_param_len);
1964
1965         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1966                 if (directed_tim) {
1967                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1968                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1969                                 ieee80211_hw_config(local,
1970                                                     IEEE80211_CONF_CHANGE_PS);
1971                                 ieee80211_send_nullfunc(local, sdata, 0);
1972                         } else {
1973                                 local->pspolling = true;
1974
1975                                 /*
1976                                  * Here is assumed that the driver will be
1977                                  * able to send ps-poll frame and receive a
1978                                  * response even though power save mode is
1979                                  * enabled, but some drivers might require
1980                                  * to disable power save here. This needs
1981                                  * to be investigated.
1982                                  */
1983                                 ieee80211_send_pspoll(local, sdata);
1984                         }
1985                 }
1986         }
1987
1988         if (elems.erp_info && elems.erp_info_len >= 1) {
1989                 erp_valid = true;
1990                 erp_value = elems.erp_info[0];
1991         } else {
1992                 erp_valid = false;
1993         }
1994         changed |= ieee80211_handle_bss_capability(sdata,
1995                         le16_to_cpu(mgmt->u.beacon.capab_info),
1996                         erp_valid, erp_value);
1997
1998
1999         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2000             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
2001                 struct sta_info *sta;
2002                 struct ieee80211_supported_band *sband;
2003                 u16 ap_ht_cap_flags;
2004
2005                 rcu_read_lock();
2006
2007                 sta = sta_info_get(local, ifmgd->bssid);
2008                 if (!sta) {
2009                         rcu_read_unlock();
2010                         return;
2011                 }
2012
2013                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2014
2015                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
2016                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2017
2018                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
2019
2020                 rcu_read_unlock();
2021
2022                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2023                                                ap_ht_cap_flags);
2024         }
2025
2026         if (elems.country_elem) {
2027                 /* Note we are only reviewing this on beacons
2028                  * for the BSSID we are associated to */
2029                 regulatory_hint_11d(local->hw.wiphy,
2030                         elems.country_elem, elems.country_elem_len);
2031
2032                 /* TODO: IBSS also needs this */
2033                 if (elems.pwr_constr_elem)
2034                         ieee80211_handle_pwr_constr(sdata,
2035                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2036                                 elems.pwr_constr_elem,
2037                                 elems.pwr_constr_elem_len);
2038         }
2039
2040         ieee80211_bss_info_change_notify(sdata, changed);
2041 }
2042
2043 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
2044                                           struct sk_buff *skb,
2045                                           struct ieee80211_rx_status *rx_status)
2046 {
2047         struct ieee80211_local *local = sdata->local;
2048         struct ieee80211_mgmt *mgmt;
2049         u16 fc;
2050
2051         if (skb->len < 24)
2052                 return RX_DROP_MONITOR;
2053
2054         mgmt = (struct ieee80211_mgmt *) skb->data;
2055         fc = le16_to_cpu(mgmt->frame_control);
2056
2057         switch (fc & IEEE80211_FCTL_STYPE) {
2058         case IEEE80211_STYPE_PROBE_REQ:
2059         case IEEE80211_STYPE_PROBE_RESP:
2060         case IEEE80211_STYPE_BEACON:
2061                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2062         case IEEE80211_STYPE_AUTH:
2063         case IEEE80211_STYPE_ASSOC_RESP:
2064         case IEEE80211_STYPE_REASSOC_RESP:
2065         case IEEE80211_STYPE_DEAUTH:
2066         case IEEE80211_STYPE_DISASSOC:
2067                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
2068                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
2069                 return RX_QUEUED;
2070         }
2071
2072         return RX_DROP_MONITOR;
2073 }
2074
2075 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2076                                          struct sk_buff *skb)
2077 {
2078         struct ieee80211_rx_status *rx_status;
2079         struct ieee80211_mgmt *mgmt;
2080         u16 fc;
2081
2082         rx_status = (struct ieee80211_rx_status *) skb->cb;
2083         mgmt = (struct ieee80211_mgmt *) skb->data;
2084         fc = le16_to_cpu(mgmt->frame_control);
2085
2086         switch (fc & IEEE80211_FCTL_STYPE) {
2087         case IEEE80211_STYPE_PROBE_RESP:
2088                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
2089                                              rx_status);
2090                 break;
2091         case IEEE80211_STYPE_BEACON:
2092                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2093                                          rx_status);
2094                 break;
2095         case IEEE80211_STYPE_AUTH:
2096                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2097                 break;
2098         case IEEE80211_STYPE_ASSOC_RESP:
2099                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
2100                 break;
2101         case IEEE80211_STYPE_REASSOC_RESP:
2102                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
2103                 break;
2104         case IEEE80211_STYPE_DEAUTH:
2105                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2106                 break;
2107         case IEEE80211_STYPE_DISASSOC:
2108                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2109                 break;
2110         }
2111
2112         kfree_skb(skb);
2113 }
2114
2115 static void ieee80211_sta_timer(unsigned long data)
2116 {
2117         struct ieee80211_sub_if_data *sdata =
2118                 (struct ieee80211_sub_if_data *) data;
2119         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2120         struct ieee80211_local *local = sdata->local;
2121
2122         if (local->quiescing) {
2123                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2124                 return;
2125         }
2126
2127         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2128         queue_work(local->hw.workqueue, &ifmgd->work);
2129 }
2130
2131 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
2132 {
2133         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2134         struct ieee80211_local *local = sdata->local;
2135
2136         /* Reset own TSF to allow time synchronization work. */
2137         drv_reset_tsf(local);
2138
2139         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
2140
2141
2142         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2143                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2144         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2145                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
2146         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2147                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
2148         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
2149                 ifmgd->auth_alg = WLAN_AUTH_FT;
2150         else
2151                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2152         ifmgd->auth_transaction = -1;
2153         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
2154         ifmgd->assoc_scan_tries = 0;
2155         ifmgd->direct_probe_tries = 0;
2156         ifmgd->auth_tries = 0;
2157         ifmgd->assoc_tries = 0;
2158         netif_tx_stop_all_queues(sdata->dev);
2159         netif_carrier_off(sdata->dev);
2160 }
2161
2162 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
2163 {
2164         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2165         struct ieee80211_local *local = sdata->local;
2166         struct ieee80211_bss *bss;
2167         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
2168         u8 ssid_len = ifmgd->ssid_len;
2169         u16 capa_mask = WLAN_CAPABILITY_ESS;
2170         u16 capa_val = WLAN_CAPABILITY_ESS;
2171         struct ieee80211_channel *chan = local->oper_channel;
2172
2173         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
2174             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2175                             IEEE80211_STA_AUTO_BSSID_SEL |
2176                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2177                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2178                 if (sdata->default_key)
2179                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2180         }
2181
2182         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2183                 chan = NULL;
2184
2185         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2186                 bssid = NULL;
2187
2188         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2189                 ssid = NULL;
2190                 ssid_len = 0;
2191         }
2192
2193         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2194                                        bssid, ssid, ssid_len,
2195                                        capa_mask, capa_val);
2196
2197         if (bss) {
2198                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2199                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2200                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2201                                                bss->ssid_len);
2202                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2203                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2204                                                     bss->supp_rates);
2205                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2206                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2207                 else
2208                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2209
2210                 /* Send out direct probe if no probe resp was received or
2211                  * the one we have is outdated
2212                  */
2213                 if (!bss->last_probe_resp ||
2214                     time_after(jiffies, bss->last_probe_resp
2215                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2216                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2217                 else
2218                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2219
2220                 ieee80211_rx_bss_put(local, bss);
2221                 ieee80211_sta_reset_auth(sdata);
2222                 return 0;
2223         } else {
2224                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2225
2226                         ifmgd->assoc_scan_tries++;
2227
2228                         ieee80211_request_internal_scan(sdata, ifmgd->ssid,
2229                                                         ssid_len);
2230
2231                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2232                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2233                 } else {
2234                         ifmgd->assoc_scan_tries = 0;
2235                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2236                         ieee80211_recalc_idle(local);
2237                 }
2238         }
2239         return -1;
2240 }
2241
2242
2243 static void ieee80211_sta_work(struct work_struct *work)
2244 {
2245         struct ieee80211_sub_if_data *sdata =
2246                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2247         struct ieee80211_local *local = sdata->local;
2248         struct ieee80211_if_managed *ifmgd;
2249         struct sk_buff *skb;
2250
2251         if (!netif_running(sdata->dev))
2252                 return;
2253
2254         if (local->sw_scanning || local->hw_scanning)
2255                 return;
2256
2257         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2258                 return;
2259
2260         /*
2261          * Nothing should have been stuffed into the workqueue during
2262          * the suspend->resume cycle. If this WARN is seen then there
2263          * is a bug with either the driver suspend or something in
2264          * mac80211 stuffing into the workqueue which we haven't yet
2265          * cleared during mac80211's suspend cycle.
2266          */
2267         if (WARN_ON(local->suspended))
2268                 return;
2269
2270         ifmgd = &sdata->u.mgd;
2271
2272         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2273                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2274
2275         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2276             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2277             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2278             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2279                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2280                                    round_jiffies_relative(0));
2281                 return;
2282         }
2283
2284         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2285                 if (ieee80211_sta_config_auth(sdata))
2286                         return;
2287                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2288         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2289                 return;
2290
2291         ieee80211_recalc_idle(local);
2292
2293         switch (ifmgd->state) {
2294         case IEEE80211_STA_MLME_DISABLED:
2295                 break;
2296         case IEEE80211_STA_MLME_DIRECT_PROBE:
2297                 ieee80211_direct_probe(sdata);
2298                 break;
2299         case IEEE80211_STA_MLME_AUTHENTICATE:
2300                 ieee80211_authenticate(sdata);
2301                 break;
2302         case IEEE80211_STA_MLME_ASSOCIATE:
2303                 ieee80211_associate(sdata);
2304                 break;
2305         case IEEE80211_STA_MLME_ASSOCIATED:
2306                 ieee80211_associated(sdata);
2307                 break;
2308         default:
2309                 WARN_ON(1);
2310                 break;
2311         }
2312
2313         if (ieee80211_privacy_mismatch(sdata)) {
2314                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2315                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2316
2317                 ieee80211_set_disassoc(sdata, false, true,
2318                                         WLAN_REASON_UNSPECIFIED);
2319         }
2320 }
2321
2322 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2323 {
2324         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2325                 /*
2326                  * Need to update last_beacon to avoid beacon loss
2327                  * test to trigger.
2328                  */
2329                 sdata->u.mgd.last_beacon = jiffies;
2330
2331
2332                 queue_work(sdata->local->hw.workqueue,
2333                            &sdata->u.mgd.work);
2334         }
2335 }
2336
2337 #ifdef CONFIG_PM
2338 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2339 {
2340         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2341
2342         /*
2343          * we need to use atomic bitops for the running bits
2344          * only because both timers might fire at the same
2345          * time -- the code here is properly synchronised.
2346          */
2347
2348         cancel_work_sync(&ifmgd->work);
2349         cancel_work_sync(&ifmgd->beacon_loss_work);
2350         if (del_timer_sync(&ifmgd->timer))
2351                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2352
2353         cancel_work_sync(&ifmgd->chswitch_work);
2354         if (del_timer_sync(&ifmgd->chswitch_timer))
2355                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2356 }
2357
2358 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2359 {
2360         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2361
2362         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2363                 add_timer(&ifmgd->timer);
2364         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2365                 add_timer(&ifmgd->chswitch_timer);
2366 }
2367 #endif
2368
2369 /* interface setup */
2370 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2371 {
2372         struct ieee80211_if_managed *ifmgd;
2373         u32 hw_flags;
2374
2375         ifmgd = &sdata->u.mgd;
2376         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2377         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2378         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2379         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2380                     (unsigned long) sdata);
2381         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2382                     (unsigned long) sdata);
2383         skb_queue_head_init(&ifmgd->skb_queue);
2384
2385         ifmgd->capab = WLAN_CAPABILITY_ESS;
2386         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2387                 IEEE80211_AUTH_ALG_SHARED_KEY;
2388         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2389                 IEEE80211_STA_AUTO_BSSID_SEL |
2390                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2391         if (sdata->local->hw.queues >= 4)
2392                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2393
2394         hw_flags = sdata->local->hw.flags;
2395
2396         if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
2397                 ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
2398                 sdata->local->hw.conf.dynamic_ps_timeout = 500;
2399         }
2400 }
2401
2402 /* configuration hooks */
2403 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2404 {
2405         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2406         struct ieee80211_local *local = sdata->local;
2407
2408         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2409                 return;
2410
2411         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2412                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2413             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2414                              IEEE80211_STA_AUTO_SSID_SEL))) {
2415
2416                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2417                         ieee80211_set_disassoc(sdata, true, true,
2418                                                WLAN_REASON_DEAUTH_LEAVING);
2419
2420                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2421                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2422                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2423                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2424                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2425                 queue_work(local->hw.workqueue, &ifmgd->work);
2426         }
2427 }
2428
2429 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2430 {
2431         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2432
2433         if (ifmgd->ssid_len)
2434                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2435         else
2436                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2437
2438         return 0;
2439 }
2440
2441 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2442 {
2443         struct ieee80211_if_managed *ifmgd;
2444
2445         if (len > IEEE80211_MAX_SSID_LEN)
2446                 return -EINVAL;
2447
2448         ifmgd = &sdata->u.mgd;
2449
2450         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2451                 /*
2452                  * Do not use reassociation if SSID is changed (different ESS).
2453                  */
2454                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2455                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2456                 memcpy(ifmgd->ssid, ssid, len);
2457                 ifmgd->ssid_len = len;
2458         }
2459
2460         return ieee80211_sta_commit(sdata);
2461 }
2462
2463 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2464 {
2465         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2466         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2467         *len = ifmgd->ssid_len;
2468         return 0;
2469 }
2470
2471 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2472 {
2473         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2474
2475         if (is_valid_ether_addr(bssid)) {
2476                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2477                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2478         } else {
2479                 memset(ifmgd->bssid, 0, ETH_ALEN);
2480                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2481         }
2482
2483         if (netif_running(sdata->dev))
2484                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2485
2486         return ieee80211_sta_commit(sdata);
2487 }
2488
2489 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2490                                const char *ie, size_t len)
2491 {
2492         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2493
2494         kfree(ifmgd->extra_ie);
2495         if (len == 0) {
2496                 ifmgd->extra_ie = NULL;
2497                 ifmgd->extra_ie_len = 0;
2498                 return 0;
2499         }
2500         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2501         if (!ifmgd->extra_ie) {
2502                 ifmgd->extra_ie_len = 0;
2503                 return -ENOMEM;
2504         }
2505         memcpy(ifmgd->extra_ie, ie, len);
2506         ifmgd->extra_ie_len = len;
2507         return 0;
2508 }
2509
2510 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2511 {
2512         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2513                sdata->dev->name, reason);
2514
2515         ieee80211_set_disassoc(sdata, true, true, reason);
2516         return 0;
2517 }
2518
2519 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2520 {
2521         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2522
2523         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2524                sdata->dev->name, reason);
2525
2526         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2527                 return -ENOLINK;
2528
2529         ieee80211_set_disassoc(sdata, false, true, reason);
2530         return 0;
2531 }
2532
2533 /* scan finished notification */
2534 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2535 {
2536         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2537
2538         /* Restart STA timers */
2539         rcu_read_lock();
2540         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2541                 ieee80211_restart_sta_timer(sdata);
2542         rcu_read_unlock();
2543 }
2544
2545 int ieee80211_max_network_latency(struct notifier_block *nb,
2546                                   unsigned long data, void *dummy)
2547 {
2548         s32 latency_usec = (s32) data;
2549         struct ieee80211_local *local =
2550                 container_of(nb, struct ieee80211_local,
2551                              network_latency_notifier);
2552
2553         mutex_lock(&local->iflist_mtx);
2554         ieee80211_recalc_ps(local, latency_usec);
2555         mutex_unlock(&local->iflist_mtx);
2556
2557         return 0;
2558 }