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
 981         /* And the BSSID changed - we're associated now */
 982         bss_info_changed |= BSS_CHANGED_BSSID;
 983
 984         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 985
 986         /* will be same as sdata */
 987         if (local->ps_sdata) {
 988                 mutex_lock(&local->iflist_mtx);
 989                 ieee80211_recalc_ps(local, -1);
 990                 mutex_unlock(&local->iflist_mtx);
 991         }
 992
 993         netif_tx_start_all_queues(sdata->dev);
 994         netif_carrier_on(sdata->dev);
 995
 996         ieee80211_sta_send_apinfo(sdata);
 997 }
 998
 999 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
1000 {
1001         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1002         struct ieee80211_local *local = sdata->local;
1003
1004         ifmgd->direct_probe_tries++;
1005         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
1006                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
1007                        sdata->dev->name, ifmgd->bssid);
1008                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1009                 ieee80211_recalc_idle(local);
1010                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
1011
1012                 /*
1013                  * Most likely AP is not in the range so remove the
1014                  * bss information associated to the AP
1015                  */
1016                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1017                                 sdata->local->hw.conf.channel->center_freq,
1018                                 ifmgd->ssid, ifmgd->ssid_len);
1019
1020                 /*
1021                  * We might have a pending scan which had no chance to run yet
1022                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
1023                  * Hence, queue the STAs work again
1024                  */
1025                 queue_work(local->hw.workqueue, &ifmgd->work);
1026                 return;
1027         }
1028
1029         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
1030                         sdata->dev->name, ifmgd->bssid,
1031                         ifmgd->direct_probe_tries);
1032
1033         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1034
1035         /* Direct probe is sent to broadcast address as some APs
1036          * will not answer to direct packet in unassociated state.
1037          */
1038         ieee80211_send_probe_req(sdata, NULL,
1039                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
1040
1041         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
1042 }
1043
1044
1045 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
1046 {
1047         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1048         struct ieee80211_local *local = sdata->local;
1049         u8 *ies;
1050         size_t ies_len;
1051
1052         ifmgd->auth_tries++;
1053         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
1054                 printk(KERN_DEBUG "%s: authentication with AP %pM"
1055                        " timed out\n",
1056                        sdata->dev->name, ifmgd->bssid);
1057                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1058                 ieee80211_recalc_idle(local);
1059                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
1060                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1061                                 sdata->local->hw.conf.channel->center_freq,
1062                                 ifmgd->ssid, ifmgd->ssid_len);
1063
1064                 /*
1065                  * We might have a pending scan which had no chance to run yet
1066                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
1067                  * Hence, queue the STAs work again
1068                  */
1069                 queue_work(local->hw.workqueue, &ifmgd->work);
1070                 return;
1071         }
1072
1073         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1074         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
1075                sdata->dev->name, ifmgd->bssid);
1076
1077         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1078                 ies = ifmgd->sme_auth_ie;
1079                 ies_len = ifmgd->sme_auth_ie_len;
1080         } else {
1081                 ies = NULL;
1082                 ies_len = 0;
1083         }
1084         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
1085                             ifmgd->bssid, 0);
1086         ifmgd->auth_transaction = 2;
1087
1088         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
1089 }
1090
1091 /*
1092  * The disassoc 'reason' argument can be either our own reason
1093  * if self disconnected or a reason code from the AP.
1094  */
1095 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1096                                    bool deauth, bool self_disconnected,
1097                                    u16 reason)
1098 {
1099         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1100         struct ieee80211_local *local = sdata->local;
1101         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
1102         struct ieee80211_bss *bss;
1103         struct sta_info *sta;
1104         u32 changed = 0, config_changed = 0;
1105
1106         rcu_read_lock();
1107
1108         sta = sta_info_get(local, ifmgd->bssid);
1109         if (!sta) {
1110                 rcu_read_unlock();
1111                 return;
1112         }
1113
1114         if (deauth) {
1115                 ifmgd->direct_probe_tries = 0;
1116                 ifmgd->auth_tries = 0;
1117         }
1118         ifmgd->assoc_scan_tries = 0;
1119         ifmgd->assoc_tries = 0;
1120
1121         netif_tx_stop_all_queues(sdata->dev);
1122         netif_carrier_off(sdata->dev);
1123
1124         ieee80211_sta_tear_down_BA_sessions(sta);
1125
1126         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1127                                    conf->channel->center_freq,
1128                                    ifmgd->ssid, ifmgd->ssid_len);
1129
1130         if (bss) {
1131                 cfg80211_unhold_bss(&bss->cbss);
1132                 ieee80211_rx_bss_put(local, bss);
1133         }
1134
1135         if (self_disconnected) {
1136                 if (deauth)
1137                         ieee80211_send_deauth_disassoc(sdata,
1138                                 IEEE80211_STYPE_DEAUTH, reason);
1139                 else
1140                         ieee80211_send_deauth_disassoc(sdata,
1141                                 IEEE80211_STYPE_DISASSOC, reason);
1142         }
1143
1144         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1145         changed |= ieee80211_reset_erp_info(sdata);
1146
1147         ieee80211_led_assoc(local, 0);
1148         changed |= BSS_CHANGED_ASSOC;
1149         sdata->vif.bss_conf.assoc = false;
1150
1151         ieee80211_sta_send_apinfo(sdata);
1152
1153         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1154                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1155                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1156                                 sdata->local->hw.conf.channel->center_freq,
1157                                 ifmgd->ssid, ifmgd->ssid_len);
1158         }
1159
1160         rcu_read_unlock();
1161
1162         ieee80211_set_wmm_default(sdata);
1163
1164         ieee80211_recalc_idle(local);
1165
1166         /* channel(_type) changes are handled by ieee80211_hw_config */
1167         local->oper_channel_type = NL80211_CHAN_NO_HT;
1168
1169         /* on the next assoc, re-program HT parameters */
1170         sdata->ht_opmode_valid = false;
1171
1172         local->power_constr_level = 0;
1173
1174         del_timer_sync(&local->dynamic_ps_timer);
1175         cancel_work_sync(&local->dynamic_ps_enable_work);
1176
1177         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1178                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1179                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1180         }
1181
1182         ieee80211_hw_config(local, config_changed);
1183
1184         /* And the BSSID changed -- not very interesting here */
1185         changed |= BSS_CHANGED_BSSID;
1186         ieee80211_bss_info_change_notify(sdata, changed);
1187
1188         rcu_read_lock();
1189
1190         sta = sta_info_get(local, ifmgd->bssid);
1191         if (!sta) {
1192                 rcu_read_unlock();
1193                 return;
1194         }
1195
1196         sta_info_unlink(&sta);
1197
1198         rcu_read_unlock();
1199
1200         sta_info_destroy(sta);
1201 }
1202
1203 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1204 {
1205         if (!sdata || !sdata->default_key ||
1206             sdata->default_key->conf.alg != ALG_WEP)
1207                 return 0;
1208         return 1;
1209 }
1210
1211 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
1212 {
1213         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1214         struct ieee80211_local *local = sdata->local;
1215         struct ieee80211_bss *bss;
1216         int bss_privacy;
1217         int wep_privacy;
1218         int privacy_invoked;
1219
1220         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
1221                 return 0;
1222
1223         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1224                                    local->hw.conf.channel->center_freq,
1225                                    ifmgd->ssid, ifmgd->ssid_len);
1226         if (!bss)
1227                 return 0;
1228
1229         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1230         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1231         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
1232
1233         ieee80211_rx_bss_put(local, bss);
1234
1235         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1236                 return 0;
1237
1238         return 1;
1239 }
1240
1241 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
1242 {
1243         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1244         struct ieee80211_local *local = sdata->local;
1245
1246         ifmgd->assoc_tries++;
1247         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1248                 printk(KERN_DEBUG "%s: association with AP %pM"
1249                        " timed out\n",
1250                        sdata->dev->name, ifmgd->bssid);
1251                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1252                 ieee80211_recalc_idle(local);
1253                 cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid);
1254                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1255                                 sdata->local->hw.conf.channel->center_freq,
1256                                 ifmgd->ssid, ifmgd->ssid_len);
1257                 /*
1258                  * We might have a pending scan which had no chance to run yet
1259                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1260                  * Hence, queue the STAs work again
1261                  */
1262                 queue_work(local->hw.workqueue, &ifmgd->work);
1263                 return;
1264         }
1265
1266         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1267         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1268                sdata->dev->name, ifmgd->bssid);
1269         if (ieee80211_privacy_mismatch(sdata)) {
1270                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1271                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1272                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1273                 ieee80211_recalc_idle(local);
1274                 return;
1275         }
1276
1277         ieee80211_send_assoc(sdata);
1278
1279         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1280 }
1281
1282 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1283                              struct ieee80211_hdr *hdr)
1284 {
1285         /*
1286          * We can postpone the mgd.timer whenever receiving unicast frames
1287          * from AP because we know that the connection is working both ways
1288          * at that time. But multicast frames (and hence also beacons) must
1289          * be ignored here, because we need to trigger the timer during
1290          * data idle periods for sending the periodical probe request to
1291          * the AP.
1292          */
1293         if (!is_multicast_ether_addr(hdr->addr1))
1294                 mod_timer(&sdata->u.mgd.timer,
1295                           jiffies + IEEE80211_MONITORING_INTERVAL);
1296 }
1297
1298 void ieee80211_beacon_loss_work(struct work_struct *work)
1299 {
1300         struct ieee80211_sub_if_data *sdata =
1301                 container_of(work, struct ieee80211_sub_if_data,
1302                              u.mgd.beacon_loss_work);
1303         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1304
1305         /*
1306          * The driver has already reported this event and we have
1307          * already sent a probe request. Maybe the AP died and the
1308          * driver keeps reporting until we disassociate... We have
1309          * to ignore that because otherwise we would continually
1310          * reset the timer and never check whether we received a
1311          * probe response!
1312          */
1313         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1314                 return;
1315
1316 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1317         if (net_ratelimit()) {
1318                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1319                        "- sending probe request\n", sdata->dev->name,
1320                        sdata->u.mgd.bssid);
1321         }
1322 #endif
1323
1324         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1325         ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1326                                  ifmgd->ssid_len, NULL, 0);
1327
1328         mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1329 }
1330
1331 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1332 {
1333         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1334
1335         queue_work(sdata->local->hw.workqueue,
1336                    &sdata->u.mgd.beacon_loss_work);
1337 }
1338 EXPORT_SYMBOL(ieee80211_beacon_loss);
1339
1340 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1341 {
1342         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1343         struct ieee80211_local *local = sdata->local;
1344         struct sta_info *sta;
1345         bool disassoc = false;
1346
1347         /* TODO: start monitoring current AP signal quality and number of
1348          * missed beacons. Scan other channels every now and then and search
1349          * for better APs. */
1350         /* TODO: remove expired BSSes */
1351
1352         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1353
1354         rcu_read_lock();
1355
1356         sta = sta_info_get(local, ifmgd->bssid);
1357         if (!sta) {
1358                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1359                        sdata->dev->name, ifmgd->bssid);
1360                 disassoc = true;
1361                 goto unlock;
1362         }
1363
1364         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1365             time_after(jiffies, sta->last_rx + IEEE80211_PROBE_WAIT)) {
1366                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1367                        "- disassociating\n",
1368                        sdata->dev->name, ifmgd->bssid);
1369                 disassoc = true;
1370                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1371                 goto unlock;
1372         }
1373
1374         /*
1375          * Beacon filtering is only enabled with power save and then the
1376          * stack should not check for beacon loss.
1377          */
1378         if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1379               (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1380             time_after(jiffies,
1381                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1382 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1383                 if (net_ratelimit()) {
1384                         printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1385                                "- sending probe request\n",
1386                                sdata->dev->name, ifmgd->bssid);
1387                 }
1388 #endif
1389                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1390                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1391                                          ifmgd->ssid_len, NULL, 0);
1392                 goto unlock;
1393
1394         }
1395
1396         if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1397                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1398                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1399                                          ifmgd->ssid_len, NULL, 0);
1400         }
1401
1402  unlock:
1403         rcu_read_unlock();
1404
1405         if (disassoc)
1406                 ieee80211_set_disassoc(sdata, true, true,
1407                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1408         else
1409                 mod_timer(&ifmgd->timer, jiffies +
1410                                       IEEE80211_MONITORING_INTERVAL);
1411 }
1412
1413
1414 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1415 {
1416         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1417
1418         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1419         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1420         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1421                 /* Wait for SME to request association */
1422                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1423                 ieee80211_recalc_idle(sdata->local);
1424         } else
1425                 ieee80211_associate(sdata);
1426 }
1427
1428
1429 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1430                                      struct ieee80211_mgmt *mgmt,
1431                                      size_t len)
1432 {
1433         u8 *pos;
1434         struct ieee802_11_elems elems;
1435
1436         pos = mgmt->u.auth.variable;
1437         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1438         if (!elems.challenge)
1439                 return;
1440         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1441                             elems.challenge - 2, elems.challenge_len + 2,
1442                             sdata->u.mgd.bssid, 1);
1443         sdata->u.mgd.auth_transaction = 4;
1444 }
1445
1446 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1447                                    struct ieee80211_mgmt *mgmt,
1448                                    size_t len)
1449 {
1450         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1451         u16 auth_alg, auth_transaction, status_code;
1452
1453         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1454                 return;
1455
1456         if (len < 24 + 6)
1457                 return;
1458
1459         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1460                 return;
1461
1462         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1463                 return;
1464
1465         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1466         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1467         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1468
1469         if (auth_alg != ifmgd->auth_alg ||
1470             auth_transaction != ifmgd->auth_transaction)
1471                 return;
1472
1473         if (status_code != WLAN_STATUS_SUCCESS) {
1474                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1475                         u8 algs[3];
1476                         const int num_algs = ARRAY_SIZE(algs);
1477                         int i, pos;
1478                         algs[0] = algs[1] = algs[2] = 0xff;
1479                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1480                                 algs[0] = WLAN_AUTH_OPEN;
1481                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1482                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1483                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1484                                 algs[2] = WLAN_AUTH_LEAP;
1485                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1486                                 pos = 0;
1487                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1488                                 pos = 1;
1489                         else
1490                                 pos = 2;
1491                         for (i = 0; i < num_algs; i++) {
1492                                 pos++;
1493                                 if (pos >= num_algs)
1494                                         pos = 0;
1495                                 if (algs[pos] == ifmgd->auth_alg ||
1496                                     algs[pos] == 0xff)
1497                                         continue;
1498                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1499                                     !ieee80211_sta_wep_configured(sdata))
1500                                         continue;
1501                                 ifmgd->auth_alg = algs[pos];
1502                                 break;
1503                         }
1504                 }
1505                 return;
1506         }
1507
1508         switch (ifmgd->auth_alg) {
1509         case WLAN_AUTH_OPEN:
1510         case WLAN_AUTH_LEAP:
1511         case WLAN_AUTH_FT:
1512                 ieee80211_auth_completed(sdata);
1513                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1514                 break;
1515         case WLAN_AUTH_SHARED_KEY:
1516                 if (ifmgd->auth_transaction == 4) {
1517                         ieee80211_auth_completed(sdata);
1518                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1519                 } else
1520                         ieee80211_auth_challenge(sdata, mgmt, len);
1521                 break;
1522         }
1523 }
1524
1525
1526 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1527                                      struct ieee80211_mgmt *mgmt,
1528                                      size_t len)
1529 {
1530         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1531         u16 reason_code;
1532
1533         if (len < 24 + 2)
1534                 return;
1535
1536         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1537                 return;
1538
1539         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1540
1541         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1542                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1543                                 sdata->dev->name, reason_code);
1544
1545         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1546             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1547              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1548              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1549                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1550                 mod_timer(&ifmgd->timer, jiffies +
1551                                       IEEE80211_RETRY_AUTH_INTERVAL);
1552         }
1553
1554         ieee80211_set_disassoc(sdata, true, false, 0);
1555         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1556         cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1557 }
1558
1559
1560 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1561                                        struct ieee80211_mgmt *mgmt,
1562                                        size_t len)
1563 {
1564         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1565         u16 reason_code;
1566
1567         if (len < 24 + 2)
1568                 return;
1569
1570         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1571                 return;
1572
1573         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1574
1575         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1576                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1577                                 sdata->dev->name, reason_code);
1578
1579         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1580             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1581                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1582                 mod_timer(&ifmgd->timer, jiffies +
1583                                       IEEE80211_RETRY_AUTH_INTERVAL);
1584         }
1585
1586         ieee80211_set_disassoc(sdata, false, false, reason_code);
1587         cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1588 }
1589
1590
1591 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1592                                          struct ieee80211_mgmt *mgmt,
1593                                          size_t len,
1594                                          int reassoc)
1595 {
1596         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1597         struct ieee80211_local *local = sdata->local;
1598         struct ieee80211_supported_band *sband;
1599         struct sta_info *sta;
1600         u32 rates, basic_rates;
1601         u16 capab_info, status_code, aid;
1602         struct ieee802_11_elems elems;
1603         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1604         u8 *pos;
1605         u32 changed = 0;
1606         int i, j;
1607         bool have_higher_than_11mbit = false, newsta = false;
1608         u16 ap_ht_cap_flags;
1609
1610         /* AssocResp and ReassocResp have identical structure, so process both
1611          * of them in this function. */
1612
1613         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1614                 return;
1615
1616         if (len < 24 + 6)
1617                 return;
1618
1619         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1620                 return;
1621
1622         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1623         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1624         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1625
1626         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1627                "status=%d aid=%d)\n",
1628                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1629                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1630
1631         pos = mgmt->u.assoc_resp.variable;
1632         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1633
1634         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1635             elems.timeout_int && elems.timeout_int_len == 5 &&
1636             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1637                 u32 tu, ms;
1638                 tu = get_unaligned_le32(elems.timeout_int + 1);
1639                 ms = tu * 1024 / 1000;
1640                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1641                        "comeback duration %u TU (%u ms)\n",
1642                        sdata->dev->name, tu, ms);
1643                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1644                         mod_timer(&ifmgd->timer,
1645                                   jiffies + msecs_to_jiffies(ms));
1646                 return;
1647         }
1648
1649         if (status_code != WLAN_STATUS_SUCCESS) {
1650                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1651                        sdata->dev->name, status_code);
1652                 /* if this was a reassociation, ensure we try a "full"
1653                  * association next time. This works around some broken APs
1654                  * which do not correctly reject reassociation requests. */
1655                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1656                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1657                 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1658                         /* Wait for SME to decide what to do next */
1659                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1660                         ieee80211_recalc_idle(local);
1661                 }
1662                 return;
1663         }
1664
1665         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1666                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1667                        "set\n", sdata->dev->name, aid);
1668         aid &= ~(BIT(15) | BIT(14));
1669
1670         if (!elems.supp_rates) {
1671                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1672                        sdata->dev->name);
1673                 return;
1674         }
1675
1676         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1677         ifmgd->aid = aid;
1678         ifmgd->ap_capab = capab_info;
1679
1680         kfree(ifmgd->assocresp_ies);
1681         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1682         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1683         if (ifmgd->assocresp_ies)
1684                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1685
1686         rcu_read_lock();
1687
1688         /* Add STA entry for the AP */
1689         sta = sta_info_get(local, ifmgd->bssid);
1690         if (!sta) {
1691                 newsta = true;
1692
1693                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1694                 if (!sta) {
1695                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1696                                " the AP\n", sdata->dev->name);
1697                         rcu_read_unlock();
1698                         return;
1699                 }
1700
1701                 /* update new sta with its last rx activity */
1702                 sta->last_rx = jiffies;
1703         }
1704
1705         /*
1706          * FIXME: Do we really need to update the sta_info's information here?
1707          *        We already know about the AP (we found it in our list) so it
1708          *        should already be filled with the right info, no?
1709          *        As is stands, all this is racy because typically we assume
1710          *        the information that is filled in here (except flags) doesn't
1711          *        change while a STA structure is alive. As such, it should move
1712          *        to between the sta_info_alloc() and sta_info_insert() above.
1713          */
1714
1715         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP);
1716         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1717                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1718
1719         rates = 0;
1720         basic_rates = 0;
1721         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1722
1723         for (i = 0; i < elems.supp_rates_len; i++) {
1724                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1725                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1726
1727                 if (rate > 110)
1728                         have_higher_than_11mbit = true;
1729
1730                 for (j = 0; j < sband->n_bitrates; j++) {
1731                         if (sband->bitrates[j].bitrate == rate) {
1732                                 rates |= BIT(j);
1733                                 if (is_basic)
1734                                         basic_rates |= BIT(j);
1735                                 break;
1736                         }
1737                 }
1738         }
1739
1740         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1741                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1742                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1743
1744                 if (rate > 110)
1745                         have_higher_than_11mbit = true;
1746
1747                 for (j = 0; j < sband->n_bitrates; j++) {
1748                         if (sband->bitrates[j].bitrate == rate) {
1749                                 rates |= BIT(j);
1750                                 if (is_basic)
1751                                         basic_rates |= BIT(j);
1752                                 break;
1753                         }
1754                 }
1755         }
1756
1757         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1758         sdata->vif.bss_conf.basic_rates = basic_rates;
1759
1760         /* cf. IEEE 802.11 9.2.12 */
1761         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1762             have_higher_than_11mbit)
1763                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1764         else
1765                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1766
1767         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1768         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1769                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1770                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1771
1772         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1773
1774         rate_control_rate_init(sta);
1775
1776         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1777                 set_sta_flags(sta, WLAN_STA_MFP);
1778
1779         if (elems.wmm_param)
1780                 set_sta_flags(sta, WLAN_STA_WME);
1781
1782         if (newsta) {
1783                 int err = sta_info_insert(sta);
1784                 if (err) {
1785                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1786                                " the AP (error %d)\n", sdata->dev->name, err);
1787                         rcu_read_unlock();
1788                         return;
1789                 }
1790         }
1791
1792         rcu_read_unlock();
1793
1794         if (elems.wmm_param)
1795                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1796                                          elems.wmm_param_len);
1797         else
1798                 ieee80211_set_wmm_default(sdata);
1799
1800         if (elems.ht_info_elem && elems.wmm_param &&
1801             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1802             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1803                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1804                                                ap_ht_cap_flags);
1805
1806         /* set AID and assoc capability,
1807          * ieee80211_set_associated() will tell the driver */
1808         bss_conf->aid = aid;
1809         bss_conf->assoc_capability = capab_info;
1810         ieee80211_set_associated(sdata, changed);
1811
1812         /*
1813          * initialise the time of last beacon to be the association time,
1814          * otherwise beacon loss check will trigger immediately
1815          */
1816         ifmgd->last_beacon = jiffies;
1817
1818         ieee80211_associated(sdata);
1819         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1820 }
1821
1822
1823 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1824                                   struct ieee80211_mgmt *mgmt,
1825                                   size_t len,
1826                                   struct ieee80211_rx_status *rx_status,
1827                                   struct ieee802_11_elems *elems,
1828                                   bool beacon)
1829 {
1830         struct ieee80211_local *local = sdata->local;
1831         int freq;
1832         struct ieee80211_bss *bss;
1833         struct ieee80211_channel *channel;
1834
1835         if (elems->ds_params && elems->ds_params_len == 1)
1836                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1837         else
1838                 freq = rx_status->freq;
1839
1840         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1841
1842         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1843                 return;
1844
1845         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1846                                         channel, beacon);
1847         if (!bss)
1848                 return;
1849
1850         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1851             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1852                 struct ieee80211_channel_sw_ie *sw_elem =
1853                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1854                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1855         }
1856
1857         ieee80211_rx_bss_put(local, bss);
1858 }
1859
1860
1861 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1862                                          struct ieee80211_mgmt *mgmt,
1863                                          size_t len,
1864                                          struct ieee80211_rx_status *rx_status)
1865 {
1866         struct ieee80211_if_managed *ifmgd;
1867         size_t baselen;
1868         struct ieee802_11_elems elems;
1869
1870         ifmgd = &sdata->u.mgd;
1871
1872         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1873                 return; /* ignore ProbeResp to foreign address */
1874
1875         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1876         if (baselen > len)
1877                 return;
1878
1879         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1880                                 &elems);
1881
1882         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1883
1884         /* direct probe may be part of the association flow */
1885         if (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE) {
1886                 printk(KERN_DEBUG "%s direct probe responded\n",
1887                        sdata->dev->name);
1888                 ieee80211_authenticate(sdata);
1889         }
1890
1891         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1892                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1893 }
1894
1895 /*
1896  * This is the canonical list of information elements we care about,
1897  * the filter code also gives us all changes to the Microsoft OUI
1898  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1899  *
1900  * We implement beacon filtering in software since that means we can
1901  * avoid processing the frame here and in cfg80211, and userspace
1902  * will not be able to tell whether the hardware supports it or not.
1903  *
1904  * XXX: This list needs to be dynamic -- userspace needs to be able to
1905  *      add items it requires. It also needs to be able to tell us to
1906  *      look out for other vendor IEs.
1907  */
1908 static const u64 care_about_ies =
1909         (1ULL << WLAN_EID_COUNTRY) |
1910         (1ULL << WLAN_EID_ERP_INFO) |
1911         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1912         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1913         (1ULL << WLAN_EID_HT_CAPABILITY) |
1914         (1ULL << WLAN_EID_HT_INFORMATION);
1915
1916 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1917                                      struct ieee80211_mgmt *mgmt,
1918                                      size_t len,
1919                                      struct ieee80211_rx_status *rx_status)
1920 {
1921         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1922         size_t baselen;
1923         struct ieee802_11_elems elems;
1924         struct ieee80211_local *local = sdata->local;
1925         u32 changed = 0;
1926         bool erp_valid, directed_tim = false;
1927         u8 erp_value = 0;
1928         u32 ncrc;
1929
1930         /* Process beacon from the current BSS */
1931         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1932         if (baselen > len)
1933                 return;
1934
1935         if (rx_status->freq != local->hw.conf.channel->center_freq)
1936                 return;
1937
1938         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1939             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1940                 return;
1941
1942         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1943 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1944                 if (net_ratelimit()) {
1945                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1946                                "to a received beacon\n", sdata->dev->name);
1947                 }
1948 #endif
1949                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1950         }
1951
1952         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1953         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1954                                           len - baselen, &elems,
1955                                           care_about_ies, ncrc);
1956
1957         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1958                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1959                                                    ifmgd->aid);
1960
1961         if (ncrc != ifmgd->beacon_crc) {
1962                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1963                                       true);
1964
1965                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1966                                          elems.wmm_param_len);
1967         }
1968
1969         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1970                 if (directed_tim) {
1971                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1972                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1973                                 ieee80211_hw_config(local,
1974                                                     IEEE80211_CONF_CHANGE_PS);
1975                                 ieee80211_send_nullfunc(local, sdata, 0);
1976                         } else {
1977                                 local->pspolling = true;
1978
1979                                 /*
1980                                  * Here is assumed that the driver will be
1981                                  * able to send ps-poll frame and receive a
1982                                  * response even though power save mode is
1983                                  * enabled, but some drivers might require
1984                                  * to disable power save here. This needs
1985                                  * to be investigated.
1986                                  */
1987                                 ieee80211_send_pspoll(local, sdata);
1988                         }
1989                 }
1990         }
1991
1992         if (ncrc == ifmgd->beacon_crc)
1993                 return;
1994         ifmgd->beacon_crc = ncrc;
1995
1996         if (elems.erp_info && elems.erp_info_len >= 1) {
1997                 erp_valid = true;
1998                 erp_value = elems.erp_info[0];
1999         } else {
2000                 erp_valid = false;
2001         }
2002         changed |= ieee80211_handle_bss_capability(sdata,
2003                         le16_to_cpu(mgmt->u.beacon.capab_info),
2004                         erp_valid, erp_value);
2005
2006
2007         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2008             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
2009                 struct sta_info *sta;
2010                 struct ieee80211_supported_band *sband;
2011                 u16 ap_ht_cap_flags;
2012
2013                 rcu_read_lock();
2014
2015                 sta = sta_info_get(local, ifmgd->bssid);
2016                 if (!sta) {
2017                         rcu_read_unlock();
2018                         return;
2019                 }
2020
2021                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2022
2023                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
2024                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2025
2026                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
2027
2028                 rcu_read_unlock();
2029
2030                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2031                                                ap_ht_cap_flags);
2032         }
2033
2034         if (elems.country_elem) {
2035                 /* Note we are only reviewing this on beacons
2036                  * for the BSSID we are associated to */
2037                 regulatory_hint_11d(local->hw.wiphy,
2038                         elems.country_elem, elems.country_elem_len);
2039
2040                 /* TODO: IBSS also needs this */
2041                 if (elems.pwr_constr_elem)
2042                         ieee80211_handle_pwr_constr(sdata,
2043                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2044                                 elems.pwr_constr_elem,
2045                                 elems.pwr_constr_elem_len);
2046         }
2047
2048         ieee80211_bss_info_change_notify(sdata, changed);
2049 }
2050
2051 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
2052                                           struct sk_buff *skb,
2053                                           struct ieee80211_rx_status *rx_status)
2054 {
2055         struct ieee80211_local *local = sdata->local;
2056         struct ieee80211_mgmt *mgmt;
2057         u16 fc;
2058
2059         if (skb->len < 24)
2060                 return RX_DROP_MONITOR;
2061
2062         mgmt = (struct ieee80211_mgmt *) skb->data;
2063         fc = le16_to_cpu(mgmt->frame_control);
2064
2065         switch (fc & IEEE80211_FCTL_STYPE) {
2066         case IEEE80211_STYPE_PROBE_REQ:
2067         case IEEE80211_STYPE_PROBE_RESP:
2068         case IEEE80211_STYPE_BEACON:
2069                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2070         case IEEE80211_STYPE_AUTH:
2071         case IEEE80211_STYPE_ASSOC_RESP:
2072         case IEEE80211_STYPE_REASSOC_RESP:
2073         case IEEE80211_STYPE_DEAUTH:
2074         case IEEE80211_STYPE_DISASSOC:
2075                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
2076                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
2077                 return RX_QUEUED;
2078         }
2079
2080         return RX_DROP_MONITOR;
2081 }
2082
2083 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2084                                          struct sk_buff *skb)
2085 {
2086         struct ieee80211_rx_status *rx_status;
2087         struct ieee80211_mgmt *mgmt;
2088         u16 fc;
2089
2090         rx_status = (struct ieee80211_rx_status *) skb->cb;
2091         mgmt = (struct ieee80211_mgmt *) skb->data;
2092         fc = le16_to_cpu(mgmt->frame_control);
2093
2094         switch (fc & IEEE80211_FCTL_STYPE) {
2095         case IEEE80211_STYPE_PROBE_RESP:
2096                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
2097                                              rx_status);
2098                 break;
2099         case IEEE80211_STYPE_BEACON:
2100                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2101                                          rx_status);
2102                 break;
2103         case IEEE80211_STYPE_AUTH:
2104                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2105                 break;
2106         case IEEE80211_STYPE_ASSOC_RESP:
2107                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
2108                 break;
2109         case IEEE80211_STYPE_REASSOC_RESP:
2110                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
2111                 break;
2112         case IEEE80211_STYPE_DEAUTH:
2113                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2114                 break;
2115         case IEEE80211_STYPE_DISASSOC:
2116                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2117                 break;
2118         }
2119
2120         kfree_skb(skb);
2121 }
2122
2123 static void ieee80211_sta_timer(unsigned long data)
2124 {
2125         struct ieee80211_sub_if_data *sdata =
2126                 (struct ieee80211_sub_if_data *) data;
2127         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2128         struct ieee80211_local *local = sdata->local;
2129
2130         if (local->quiescing) {
2131                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2132                 return;
2133         }
2134
2135         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2136         queue_work(local->hw.workqueue, &ifmgd->work);
2137 }
2138
2139 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
2140 {
2141         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2142         struct ieee80211_local *local = sdata->local;
2143
2144         /* Reset own TSF to allow time synchronization work. */
2145         drv_reset_tsf(local);
2146
2147         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
2148
2149
2150         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2151                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2152         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2153                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
2154         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2155                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
2156         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
2157                 ifmgd->auth_alg = WLAN_AUTH_FT;
2158         else
2159                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2160         ifmgd->auth_transaction = -1;
2161         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
2162         ifmgd->assoc_scan_tries = 0;
2163         ifmgd->direct_probe_tries = 0;
2164         ifmgd->auth_tries = 0;
2165         ifmgd->assoc_tries = 0;
2166         netif_tx_stop_all_queues(sdata->dev);
2167         netif_carrier_off(sdata->dev);
2168 }
2169
2170 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
2171 {
2172         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2173         struct ieee80211_local *local = sdata->local;
2174         struct ieee80211_bss *bss;
2175         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
2176         u8 ssid_len = ifmgd->ssid_len;
2177         u16 capa_mask = WLAN_CAPABILITY_ESS;
2178         u16 capa_val = WLAN_CAPABILITY_ESS;
2179         struct ieee80211_channel *chan = local->oper_channel;
2180
2181         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
2182             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2183                             IEEE80211_STA_AUTO_BSSID_SEL |
2184                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2185                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2186                 if (sdata->default_key)
2187                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2188         }
2189
2190         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2191                 chan = NULL;
2192
2193         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2194                 bssid = NULL;
2195
2196         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2197                 ssid = NULL;
2198                 ssid_len = 0;
2199         }
2200
2201         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2202                                        bssid, ssid, ssid_len,
2203                                        capa_mask, capa_val);
2204
2205         if (bss) {
2206                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2207                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2208                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2209                                                bss->ssid_len);
2210                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2211                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2212                                                     bss->supp_rates);
2213                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2214                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2215                 else
2216                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2217
2218                 /* Send out direct probe if no probe resp was received or
2219                  * the one we have is outdated
2220                  */
2221                 if (!bss->last_probe_resp ||
2222                     time_after(jiffies, bss->last_probe_resp
2223                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2224                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2225                 else
2226                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2227
2228                 ieee80211_rx_bss_put(local, bss);
2229                 ieee80211_sta_reset_auth(sdata);
2230                 return 0;
2231         } else {
2232                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2233
2234                         ifmgd->assoc_scan_tries++;
2235
2236                         ieee80211_request_internal_scan(sdata, ifmgd->ssid,
2237                                                         ssid_len);
2238
2239                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2240                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2241                 } else {
2242                         ifmgd->assoc_scan_tries = 0;
2243                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2244                         ieee80211_recalc_idle(local);
2245                 }
2246         }
2247         return -1;
2248 }
2249
2250
2251 static void ieee80211_sta_work(struct work_struct *work)
2252 {
2253         struct ieee80211_sub_if_data *sdata =
2254                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2255         struct ieee80211_local *local = sdata->local;
2256         struct ieee80211_if_managed *ifmgd;
2257         struct sk_buff *skb;
2258
2259         if (!netif_running(sdata->dev))
2260                 return;
2261
2262         if (local->sw_scanning || local->hw_scanning)
2263                 return;
2264
2265         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2266                 return;
2267
2268         /*
2269          * Nothing should have been stuffed into the workqueue during
2270          * the suspend->resume cycle. If this WARN is seen then there
2271          * is a bug with either the driver suspend or something in
2272          * mac80211 stuffing into the workqueue which we haven't yet
2273          * cleared during mac80211's suspend cycle.
2274          */
2275         if (WARN_ON(local->suspended))
2276                 return;
2277
2278         ifmgd = &sdata->u.mgd;
2279
2280         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2281                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2282
2283         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2284             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2285             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2286             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2287                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2288                                    round_jiffies_relative(0));
2289                 return;
2290         }
2291
2292         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2293                 if (ieee80211_sta_config_auth(sdata))
2294                         return;
2295                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2296         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2297                 return;
2298
2299         ieee80211_recalc_idle(local);
2300
2301         switch (ifmgd->state) {
2302         case IEEE80211_STA_MLME_DISABLED:
2303                 break;
2304         case IEEE80211_STA_MLME_DIRECT_PROBE:
2305                 ieee80211_direct_probe(sdata);
2306                 break;
2307         case IEEE80211_STA_MLME_AUTHENTICATE:
2308                 ieee80211_authenticate(sdata);
2309                 break;
2310         case IEEE80211_STA_MLME_ASSOCIATE:
2311                 ieee80211_associate(sdata);
2312                 break;
2313         case IEEE80211_STA_MLME_ASSOCIATED:
2314                 ieee80211_associated(sdata);
2315                 break;
2316         default:
2317                 WARN_ON(1);
2318                 break;
2319         }
2320
2321         if (ieee80211_privacy_mismatch(sdata)) {
2322                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2323                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2324
2325                 ieee80211_set_disassoc(sdata, false, true,
2326                                         WLAN_REASON_UNSPECIFIED);
2327         }
2328 }
2329
2330 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2331 {
2332         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2333                 /*
2334                  * Need to update last_beacon to avoid beacon loss
2335                  * test to trigger.
2336                  */
2337                 sdata->u.mgd.last_beacon = jiffies;
2338
2339
2340                 queue_work(sdata->local->hw.workqueue,
2341                            &sdata->u.mgd.work);
2342         }
2343 }
2344
2345 #ifdef CONFIG_PM
2346 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2347 {
2348         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2349
2350         /*
2351          * we need to use atomic bitops for the running bits
2352          * only because both timers might fire at the same
2353          * time -- the code here is properly synchronised.
2354          */
2355
2356         cancel_work_sync(&ifmgd->work);
2357         cancel_work_sync(&ifmgd->beacon_loss_work);
2358         if (del_timer_sync(&ifmgd->timer))
2359                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2360
2361         cancel_work_sync(&ifmgd->chswitch_work);
2362         if (del_timer_sync(&ifmgd->chswitch_timer))
2363                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2364 }
2365
2366 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2367 {
2368         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2369
2370         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2371                 add_timer(&ifmgd->timer);
2372         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2373                 add_timer(&ifmgd->chswitch_timer);
2374 }
2375 #endif
2376
2377 /* interface setup */
2378 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2379 {
2380         struct ieee80211_if_managed *ifmgd;
2381         u32 hw_flags;
2382
2383         ifmgd = &sdata->u.mgd;
2384         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2385         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2386         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2387         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2388                     (unsigned long) sdata);
2389         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2390                     (unsigned long) sdata);
2391         skb_queue_head_init(&ifmgd->skb_queue);
2392
2393         ifmgd->capab = WLAN_CAPABILITY_ESS;
2394         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2395                 IEEE80211_AUTH_ALG_SHARED_KEY;
2396         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2397                 IEEE80211_STA_AUTO_BSSID_SEL |
2398                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2399         if (sdata->local->hw.queues >= 4)
2400                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2401
2402         hw_flags = sdata->local->hw.flags;
2403
2404         if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
2405                 ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
2406                 sdata->local->hw.conf.dynamic_ps_timeout = 500;
2407         }
2408 }
2409
2410 /* configuration hooks */
2411 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2412 {
2413         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2414         struct ieee80211_local *local = sdata->local;
2415
2416         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2417                 return;
2418
2419         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2420                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2421             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2422                              IEEE80211_STA_AUTO_SSID_SEL))) {
2423
2424                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2425                         ieee80211_set_disassoc(sdata, true, true,
2426                                                WLAN_REASON_DEAUTH_LEAVING);
2427
2428                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2429                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2430                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2431                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2432                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2433                 queue_work(local->hw.workqueue, &ifmgd->work);
2434         }
2435 }
2436
2437 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2438 {
2439         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2440
2441         if (ifmgd->ssid_len)
2442                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2443         else
2444                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2445
2446         return 0;
2447 }
2448
2449 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2450 {
2451         struct ieee80211_if_managed *ifmgd;
2452
2453         if (len > IEEE80211_MAX_SSID_LEN)
2454                 return -EINVAL;
2455
2456         ifmgd = &sdata->u.mgd;
2457
2458         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2459                 /*
2460                  * Do not use reassociation if SSID is changed (different ESS).
2461                  */
2462                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2463                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2464                 memcpy(ifmgd->ssid, ssid, len);
2465                 ifmgd->ssid_len = len;
2466         }
2467
2468         return ieee80211_sta_commit(sdata);
2469 }
2470
2471 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2472 {
2473         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2474         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2475         *len = ifmgd->ssid_len;
2476         return 0;
2477 }
2478
2479 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2480 {
2481         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2482
2483         if (is_valid_ether_addr(bssid)) {
2484                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2485                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2486         } else {
2487                 memset(ifmgd->bssid, 0, ETH_ALEN);
2488                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2489         }
2490
2491         return ieee80211_sta_commit(sdata);
2492 }
2493
2494 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2495                                const char *ie, size_t len)
2496 {
2497         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2498
2499         if (len == 0 && ifmgd->extra_ie_len == 0)
2500                 return -EALREADY;
2501
2502         if (len == ifmgd->extra_ie_len && ifmgd->extra_ie &&
2503             memcmp(ifmgd->extra_ie, ie, len) == 0)
2504                 return -EALREADY;
2505
2506         kfree(ifmgd->extra_ie);
2507         if (len == 0) {
2508                 ifmgd->extra_ie = NULL;
2509                 ifmgd->extra_ie_len = 0;
2510                 return 0;
2511         }
2512         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2513         if (!ifmgd->extra_ie) {
2514                 ifmgd->extra_ie_len = 0;
2515                 return -ENOMEM;
2516         }
2517         memcpy(ifmgd->extra_ie, ie, len);
2518         ifmgd->extra_ie_len = len;
2519         return 0;
2520 }
2521
2522 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2523 {
2524         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2525                sdata->dev->name, reason);
2526
2527         ieee80211_set_disassoc(sdata, true, true, reason);
2528         return 0;
2529 }
2530
2531 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2532 {
2533         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2534
2535         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2536                sdata->dev->name, reason);
2537
2538         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2539                 return -ENOLINK;
2540
2541         ieee80211_set_disassoc(sdata, false, true, reason);
2542         return 0;
2543 }
2544
2545 /* scan finished notification */
2546 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2547 {
2548         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2549
2550         /* Restart STA timers */
2551         rcu_read_lock();
2552         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2553                 ieee80211_restart_sta_timer(sdata);
2554         rcu_read_unlock();
2555 }
2556
2557 int ieee80211_max_network_latency(struct notifier_block *nb,
2558                                   unsigned long data, void *dummy)
2559 {
2560         s32 latency_usec = (s32) data;
2561         struct ieee80211_local *local =
2562                 container_of(nb, struct ieee80211_local,
2563                              network_latency_notifier);
2564
2565         mutex_lock(&local->iflist_mtx);
2566         ieee80211_recalc_ps(local, latency_usec);
2567         mutex_unlock(&local->iflist_mtx);
2568
2569         return 0;
2570 }