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 / 5)
  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                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 797                        params.aifs, params.cw_min, 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",
 802                                wiphy_name(local->hw.wiphy), 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                 mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
1393                 goto unlock;
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         if (!disassoc)
1403                 mod_timer(&ifmgd->timer,
1404                           jiffies + IEEE80211_MONITORING_INTERVAL);
1405
1406  unlock:
1407         rcu_read_unlock();
1408
1409         if (disassoc)
1410                 ieee80211_set_disassoc(sdata, true, true,
1411                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1412 }
1413
1414
1415 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1416 {
1417         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1418
1419         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1420         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1421         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1422                 /* Wait for SME to request association */
1423                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1424                 ieee80211_recalc_idle(sdata->local);
1425         } else
1426                 ieee80211_associate(sdata);
1427 }
1428
1429
1430 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1431                                      struct ieee80211_mgmt *mgmt,
1432                                      size_t len)
1433 {
1434         u8 *pos;
1435         struct ieee802_11_elems elems;
1436
1437         pos = mgmt->u.auth.variable;
1438         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1439         if (!elems.challenge)
1440                 return;
1441         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1442                             elems.challenge - 2, elems.challenge_len + 2,
1443                             sdata->u.mgd.bssid, 1);
1444         sdata->u.mgd.auth_transaction = 4;
1445 }
1446
1447 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1448                                    struct ieee80211_mgmt *mgmt,
1449                                    size_t len)
1450 {
1451         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1452         u16 auth_alg, auth_transaction, status_code;
1453
1454         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1455                 return;
1456
1457         if (len < 24 + 6)
1458                 return;
1459
1460         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1461                 return;
1462
1463         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1464                 return;
1465
1466         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1467         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1468         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1469
1470         if (auth_alg != ifmgd->auth_alg ||
1471             auth_transaction != ifmgd->auth_transaction)
1472                 return;
1473
1474         if (status_code != WLAN_STATUS_SUCCESS) {
1475                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1476                         u8 algs[3];
1477                         const int num_algs = ARRAY_SIZE(algs);
1478                         int i, pos;
1479                         algs[0] = algs[1] = algs[2] = 0xff;
1480                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1481                                 algs[0] = WLAN_AUTH_OPEN;
1482                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1483                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1484                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1485                                 algs[2] = WLAN_AUTH_LEAP;
1486                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1487                                 pos = 0;
1488                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1489                                 pos = 1;
1490                         else
1491                                 pos = 2;
1492                         for (i = 0; i < num_algs; i++) {
1493                                 pos++;
1494                                 if (pos >= num_algs)
1495                                         pos = 0;
1496                                 if (algs[pos] == ifmgd->auth_alg ||
1497                                     algs[pos] == 0xff)
1498                                         continue;
1499                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1500                                     !ieee80211_sta_wep_configured(sdata))
1501                                         continue;
1502                                 ifmgd->auth_alg = algs[pos];
1503                                 break;
1504                         }
1505                 }
1506                 return;
1507         }
1508
1509         switch (ifmgd->auth_alg) {
1510         case WLAN_AUTH_OPEN:
1511         case WLAN_AUTH_LEAP:
1512         case WLAN_AUTH_FT:
1513                 ieee80211_auth_completed(sdata);
1514                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1515                 break;
1516         case WLAN_AUTH_SHARED_KEY:
1517                 if (ifmgd->auth_transaction == 4) {
1518                         ieee80211_auth_completed(sdata);
1519                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1520                 } else
1521                         ieee80211_auth_challenge(sdata, mgmt, len);
1522                 break;
1523         }
1524 }
1525
1526
1527 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1528                                      struct ieee80211_mgmt *mgmt,
1529                                      size_t len)
1530 {
1531         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1532         u16 reason_code;
1533
1534         if (len < 24 + 2)
1535                 return;
1536
1537         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1538                 return;
1539
1540         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1541
1542         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1543                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1544                                 sdata->dev->name, reason_code);
1545
1546         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1547             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1548              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1549              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1550                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1551                 mod_timer(&ifmgd->timer, jiffies +
1552                                       IEEE80211_RETRY_AUTH_INTERVAL);
1553         }
1554
1555         ieee80211_set_disassoc(sdata, true, false, 0);
1556         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1557         cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1558 }
1559
1560
1561 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1562                                        struct ieee80211_mgmt *mgmt,
1563                                        size_t len)
1564 {
1565         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1566         u16 reason_code;
1567
1568         if (len < 24 + 2)
1569                 return;
1570
1571         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1572                 return;
1573
1574         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1575
1576         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1577                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1578                                 sdata->dev->name, reason_code);
1579
1580         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1581             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1582                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1583                 mod_timer(&ifmgd->timer, jiffies +
1584                                       IEEE80211_RETRY_AUTH_INTERVAL);
1585         }
1586
1587         ieee80211_set_disassoc(sdata, false, false, reason_code);
1588         cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1589 }
1590
1591
1592 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1593                                          struct ieee80211_mgmt *mgmt,
1594                                          size_t len,
1595                                          int reassoc)
1596 {
1597         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1598         struct ieee80211_local *local = sdata->local;
1599         struct ieee80211_supported_band *sband;
1600         struct sta_info *sta;
1601         u32 rates, basic_rates;
1602         u16 capab_info, status_code, aid;
1603         struct ieee802_11_elems elems;
1604         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1605         u8 *pos;
1606         u32 changed = 0;
1607         int i, j;
1608         bool have_higher_than_11mbit = false, newsta = false;
1609         u16 ap_ht_cap_flags;
1610
1611         /* AssocResp and ReassocResp have identical structure, so process both
1612          * of them in this function. */
1613
1614         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1615                 return;
1616
1617         if (len < 24 + 6)
1618                 return;
1619
1620         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1621                 return;
1622
1623         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1624         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1625         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1626
1627         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1628                "status=%d aid=%d)\n",
1629                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1630                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1631
1632         pos = mgmt->u.assoc_resp.variable;
1633         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1634
1635         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1636             elems.timeout_int && elems.timeout_int_len == 5 &&
1637             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1638                 u32 tu, ms;
1639                 tu = get_unaligned_le32(elems.timeout_int + 1);
1640                 ms = tu * 1024 / 1000;
1641                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1642                        "comeback duration %u TU (%u ms)\n",
1643                        sdata->dev->name, tu, ms);
1644                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1645                         mod_timer(&ifmgd->timer,
1646                                   jiffies + msecs_to_jiffies(ms));
1647                 return;
1648         }
1649
1650         if (status_code != WLAN_STATUS_SUCCESS) {
1651                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1652                        sdata->dev->name, status_code);
1653                 /* if this was a reassociation, ensure we try a "full"
1654                  * association next time. This works around some broken APs
1655                  * which do not correctly reject reassociation requests. */
1656                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1657                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1658                 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1659                         /* Wait for SME to decide what to do next */
1660                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1661                         ieee80211_recalc_idle(local);
1662                 }
1663                 return;
1664         }
1665
1666         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1667                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1668                        "set\n", sdata->dev->name, aid);
1669         aid &= ~(BIT(15) | BIT(14));
1670
1671         if (!elems.supp_rates) {
1672                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1673                        sdata->dev->name);
1674                 return;
1675         }
1676
1677         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1678         ifmgd->aid = aid;
1679         ifmgd->ap_capab = capab_info;
1680
1681         kfree(ifmgd->assocresp_ies);
1682         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1683         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1684         if (ifmgd->assocresp_ies)
1685                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1686
1687         rcu_read_lock();
1688
1689         /* Add STA entry for the AP */
1690         sta = sta_info_get(local, ifmgd->bssid);
1691         if (!sta) {
1692                 newsta = true;
1693
1694                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1695                 if (!sta) {
1696                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1697                                " the AP\n", sdata->dev->name);
1698                         rcu_read_unlock();
1699                         return;
1700                 }
1701
1702                 /* update new sta with its last rx activity */
1703                 sta->last_rx = jiffies;
1704         }
1705
1706         /*
1707          * FIXME: Do we really need to update the sta_info's information here?
1708          *        We already know about the AP (we found it in our list) so it
1709          *        should already be filled with the right info, no?
1710          *        As is stands, all this is racy because typically we assume
1711          *        the information that is filled in here (except flags) doesn't
1712          *        change while a STA structure is alive. As such, it should move
1713          *        to between the sta_info_alloc() and sta_info_insert() above.
1714          */
1715
1716         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP);
1717         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1718                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1719
1720         rates = 0;
1721         basic_rates = 0;
1722         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1723
1724         for (i = 0; i < elems.supp_rates_len; i++) {
1725                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1726                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1727
1728                 if (rate > 110)
1729                         have_higher_than_11mbit = true;
1730
1731                 for (j = 0; j < sband->n_bitrates; j++) {
1732                         if (sband->bitrates[j].bitrate == rate) {
1733                                 rates |= BIT(j);
1734                                 if (is_basic)
1735                                         basic_rates |= BIT(j);
1736                                 break;
1737                         }
1738                 }
1739         }
1740
1741         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1742                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1743                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1744
1745                 if (rate > 110)
1746                         have_higher_than_11mbit = true;
1747
1748                 for (j = 0; j < sband->n_bitrates; j++) {
1749                         if (sband->bitrates[j].bitrate == rate) {
1750                                 rates |= BIT(j);
1751                                 if (is_basic)
1752                                         basic_rates |= BIT(j);
1753                                 break;
1754                         }
1755                 }
1756         }
1757
1758         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1759         sdata->vif.bss_conf.basic_rates = basic_rates;
1760
1761         /* cf. IEEE 802.11 9.2.12 */
1762         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1763             have_higher_than_11mbit)
1764                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1765         else
1766                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1767
1768         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1769         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1770                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1771                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1772
1773         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1774
1775         rate_control_rate_init(sta);
1776
1777         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1778                 set_sta_flags(sta, WLAN_STA_MFP);
1779
1780         if (elems.wmm_param)
1781                 set_sta_flags(sta, WLAN_STA_WME);
1782
1783         if (newsta) {
1784                 int err = sta_info_insert(sta);
1785                 if (err) {
1786                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1787                                " the AP (error %d)\n", sdata->dev->name, err);
1788                         rcu_read_unlock();
1789                         return;
1790                 }
1791         }
1792
1793         rcu_read_unlock();
1794
1795         if (elems.wmm_param)
1796                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1797                                          elems.wmm_param_len);
1798         else
1799                 ieee80211_set_wmm_default(sdata);
1800
1801         if (elems.ht_info_elem && elems.wmm_param &&
1802             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1803             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1804                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1805                                                ap_ht_cap_flags);
1806
1807         /* set AID and assoc capability,
1808          * ieee80211_set_associated() will tell the driver */
1809         bss_conf->aid = aid;
1810         bss_conf->assoc_capability = capab_info;
1811         ieee80211_set_associated(sdata, changed);
1812
1813         /*
1814          * initialise the time of last beacon to be the association time,
1815          * otherwise beacon loss check will trigger immediately
1816          */
1817         ifmgd->last_beacon = jiffies;
1818
1819         ieee80211_associated(sdata);
1820         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1821 }
1822
1823
1824 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1825                                   struct ieee80211_mgmt *mgmt,
1826                                   size_t len,
1827                                   struct ieee80211_rx_status *rx_status,
1828                                   struct ieee802_11_elems *elems,
1829                                   bool beacon)
1830 {
1831         struct ieee80211_local *local = sdata->local;
1832         int freq;
1833         struct ieee80211_bss *bss;
1834         struct ieee80211_channel *channel;
1835
1836         if (elems->ds_params && elems->ds_params_len == 1)
1837                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1838         else
1839                 freq = rx_status->freq;
1840
1841         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1842
1843         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1844                 return;
1845
1846         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1847                                         channel, beacon);
1848         if (!bss)
1849                 return;
1850
1851         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1852             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1853                 struct ieee80211_channel_sw_ie *sw_elem =
1854                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1855                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1856         }
1857
1858         ieee80211_rx_bss_put(local, bss);
1859 }
1860
1861
1862 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1863                                          struct ieee80211_mgmt *mgmt,
1864                                          size_t len,
1865                                          struct ieee80211_rx_status *rx_status)
1866 {
1867         struct ieee80211_if_managed *ifmgd;
1868         size_t baselen;
1869         struct ieee802_11_elems elems;
1870
1871         ifmgd = &sdata->u.mgd;
1872
1873         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1874                 return; /* ignore ProbeResp to foreign address */
1875
1876         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1877         if (baselen > len)
1878                 return;
1879
1880         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1881                                 &elems);
1882
1883         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1884
1885         /* direct probe may be part of the association flow */
1886         if (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE) {
1887                 printk(KERN_DEBUG "%s direct probe responded\n",
1888                        sdata->dev->name);
1889                 ieee80211_authenticate(sdata);
1890         }
1891
1892         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1893                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1894 }
1895
1896 /*
1897  * This is the canonical list of information elements we care about,
1898  * the filter code also gives us all changes to the Microsoft OUI
1899  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1900  *
1901  * We implement beacon filtering in software since that means we can
1902  * avoid processing the frame here and in cfg80211, and userspace
1903  * will not be able to tell whether the hardware supports it or not.
1904  *
1905  * XXX: This list needs to be dynamic -- userspace needs to be able to
1906  *      add items it requires. It also needs to be able to tell us to
1907  *      look out for other vendor IEs.
1908  */
1909 static const u64 care_about_ies =
1910         (1ULL << WLAN_EID_COUNTRY) |
1911         (1ULL << WLAN_EID_ERP_INFO) |
1912         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1913         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1914         (1ULL << WLAN_EID_HT_CAPABILITY) |
1915         (1ULL << WLAN_EID_HT_INFORMATION);
1916
1917 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1918                                      struct ieee80211_mgmt *mgmt,
1919                                      size_t len,
1920                                      struct ieee80211_rx_status *rx_status)
1921 {
1922         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1923         size_t baselen;
1924         struct ieee802_11_elems elems;
1925         struct ieee80211_local *local = sdata->local;
1926         u32 changed = 0;
1927         bool erp_valid, directed_tim = false;
1928         u8 erp_value = 0;
1929         u32 ncrc;
1930
1931         /* Process beacon from the current BSS */
1932         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1933         if (baselen > len)
1934                 return;
1935
1936         if (rx_status->freq != local->hw.conf.channel->center_freq)
1937                 return;
1938
1939         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1940             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1941                 return;
1942
1943         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
1944 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1945                 if (net_ratelimit()) {
1946                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1947                                "to a received beacon\n", sdata->dev->name);
1948                 }
1949 #endif
1950                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1951         }
1952
1953         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1954         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1955                                           len - baselen, &elems,
1956                                           care_about_ies, ncrc);
1957
1958         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1959                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1960                                                    ifmgd->aid);
1961
1962         if (ncrc != ifmgd->beacon_crc) {
1963                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1964                                       true);
1965
1966                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1967                                          elems.wmm_param_len);
1968         }
1969
1970         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1971                 if (directed_tim) {
1972                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1973                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1974                                 ieee80211_hw_config(local,
1975                                                     IEEE80211_CONF_CHANGE_PS);
1976                                 ieee80211_send_nullfunc(local, sdata, 0);
1977                         } else {
1978                                 local->pspolling = true;
1979
1980                                 /*
1981                                  * Here is assumed that the driver will be
1982                                  * able to send ps-poll frame and receive a
1983                                  * response even though power save mode is
1984                                  * enabled, but some drivers might require
1985                                  * to disable power save here. This needs
1986                                  * to be investigated.
1987                                  */
1988                                 ieee80211_send_pspoll(local, sdata);
1989                         }
1990                 }
1991         }
1992
1993         if (ncrc == ifmgd->beacon_crc)
1994                 return;
1995         ifmgd->beacon_crc = ncrc;
1996
1997         if (elems.erp_info && elems.erp_info_len >= 1) {
1998                 erp_valid = true;
1999                 erp_value = elems.erp_info[0];
2000         } else {
2001                 erp_valid = false;
2002         }
2003         changed |= ieee80211_handle_bss_capability(sdata,
2004                         le16_to_cpu(mgmt->u.beacon.capab_info),
2005                         erp_valid, erp_value);
2006
2007
2008         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2009             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
2010                 struct sta_info *sta;
2011                 struct ieee80211_supported_band *sband;
2012                 u16 ap_ht_cap_flags;
2013
2014                 rcu_read_lock();
2015
2016                 sta = sta_info_get(local, ifmgd->bssid);
2017                 if (!sta) {
2018                         rcu_read_unlock();
2019                         return;
2020                 }
2021
2022                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2023
2024                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
2025                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2026
2027                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
2028
2029                 rcu_read_unlock();
2030
2031                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2032                                                ap_ht_cap_flags);
2033         }
2034
2035         if (elems.country_elem) {
2036                 /* Note we are only reviewing this on beacons
2037                  * for the BSSID we are associated to */
2038                 regulatory_hint_11d(local->hw.wiphy,
2039                         elems.country_elem, elems.country_elem_len);
2040
2041                 /* TODO: IBSS also needs this */
2042                 if (elems.pwr_constr_elem)
2043                         ieee80211_handle_pwr_constr(sdata,
2044                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2045                                 elems.pwr_constr_elem,
2046                                 elems.pwr_constr_elem_len);
2047         }
2048
2049         ieee80211_bss_info_change_notify(sdata, changed);
2050 }
2051
2052 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
2053                                           struct sk_buff *skb,
2054                                           struct ieee80211_rx_status *rx_status)
2055 {
2056         struct ieee80211_local *local = sdata->local;
2057         struct ieee80211_mgmt *mgmt;
2058         u16 fc;
2059
2060         if (skb->len < 24)
2061                 return RX_DROP_MONITOR;
2062
2063         mgmt = (struct ieee80211_mgmt *) skb->data;
2064         fc = le16_to_cpu(mgmt->frame_control);
2065
2066         switch (fc & IEEE80211_FCTL_STYPE) {
2067         case IEEE80211_STYPE_PROBE_REQ:
2068         case IEEE80211_STYPE_PROBE_RESP:
2069         case IEEE80211_STYPE_BEACON:
2070                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2071         case IEEE80211_STYPE_AUTH:
2072         case IEEE80211_STYPE_ASSOC_RESP:
2073         case IEEE80211_STYPE_REASSOC_RESP:
2074         case IEEE80211_STYPE_DEAUTH:
2075         case IEEE80211_STYPE_DISASSOC:
2076                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
2077                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
2078                 return RX_QUEUED;
2079         }
2080
2081         return RX_DROP_MONITOR;
2082 }
2083
2084 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2085                                          struct sk_buff *skb)
2086 {
2087         struct ieee80211_rx_status *rx_status;
2088         struct ieee80211_mgmt *mgmt;
2089         u16 fc;
2090
2091         rx_status = (struct ieee80211_rx_status *) skb->cb;
2092         mgmt = (struct ieee80211_mgmt *) skb->data;
2093         fc = le16_to_cpu(mgmt->frame_control);
2094
2095         switch (fc & IEEE80211_FCTL_STYPE) {
2096         case IEEE80211_STYPE_PROBE_RESP:
2097                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
2098                                              rx_status);
2099                 break;
2100         case IEEE80211_STYPE_BEACON:
2101                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2102                                          rx_status);
2103                 break;
2104         case IEEE80211_STYPE_AUTH:
2105                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2106                 break;
2107         case IEEE80211_STYPE_ASSOC_RESP:
2108                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
2109                 break;
2110         case IEEE80211_STYPE_REASSOC_RESP:
2111                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
2112                 break;
2113         case IEEE80211_STYPE_DEAUTH:
2114                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2115                 break;
2116         case IEEE80211_STYPE_DISASSOC:
2117                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2118                 break;
2119         }
2120
2121         kfree_skb(skb);
2122 }
2123
2124 static void ieee80211_sta_timer(unsigned long data)
2125 {
2126         struct ieee80211_sub_if_data *sdata =
2127                 (struct ieee80211_sub_if_data *) data;
2128         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2129         struct ieee80211_local *local = sdata->local;
2130
2131         if (local->quiescing) {
2132                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2133                 return;
2134         }
2135
2136         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2137         queue_work(local->hw.workqueue, &ifmgd->work);
2138 }
2139
2140 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
2141 {
2142         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2143         struct ieee80211_local *local = sdata->local;
2144
2145         /* Reset own TSF to allow time synchronization work. */
2146         drv_reset_tsf(local);
2147
2148         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
2149
2150
2151         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2152                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2153         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2154                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
2155         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2156                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
2157         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
2158                 ifmgd->auth_alg = WLAN_AUTH_FT;
2159         else
2160                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2161         ifmgd->auth_transaction = -1;
2162         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
2163         ifmgd->assoc_scan_tries = 0;
2164         ifmgd->direct_probe_tries = 0;
2165         ifmgd->auth_tries = 0;
2166         ifmgd->assoc_tries = 0;
2167         netif_tx_stop_all_queues(sdata->dev);
2168         netif_carrier_off(sdata->dev);
2169 }
2170
2171 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
2172 {
2173         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2174         struct ieee80211_local *local = sdata->local;
2175         struct ieee80211_bss *bss;
2176         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
2177         u8 ssid_len = ifmgd->ssid_len;
2178         u16 capa_mask = WLAN_CAPABILITY_ESS;
2179         u16 capa_val = WLAN_CAPABILITY_ESS;
2180         struct ieee80211_channel *chan = local->oper_channel;
2181
2182         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
2183             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2184                             IEEE80211_STA_AUTO_BSSID_SEL |
2185                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2186                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2187                 if (sdata->default_key)
2188                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2189         }
2190
2191         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2192                 chan = NULL;
2193
2194         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2195                 bssid = NULL;
2196
2197         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2198                 ssid = NULL;
2199                 ssid_len = 0;
2200         }
2201
2202         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2203                                        bssid, ssid, ssid_len,
2204                                        capa_mask, capa_val);
2205
2206         if (bss) {
2207                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2208                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2209                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2210                                                bss->ssid_len);
2211                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2212                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2213                                                     bss->supp_rates);
2214                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2215                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2216                 else
2217                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2218
2219                 /* Send out direct probe if no probe resp was received or
2220                  * the one we have is outdated
2221                  */
2222                 if (!bss->last_probe_resp ||
2223                     time_after(jiffies, bss->last_probe_resp
2224                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2225                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2226                 else
2227                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2228
2229                 ieee80211_rx_bss_put(local, bss);
2230                 ieee80211_sta_reset_auth(sdata);
2231                 return 0;
2232         } else {
2233                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2234
2235                         ifmgd->assoc_scan_tries++;
2236
2237                         ieee80211_request_internal_scan(sdata, ifmgd->ssid,
2238                                                         ssid_len);
2239
2240                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2241                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2242                 } else {
2243                         ifmgd->assoc_scan_tries = 0;
2244                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2245                         ieee80211_recalc_idle(local);
2246                 }
2247         }
2248         return -1;
2249 }
2250
2251
2252 static void ieee80211_sta_work(struct work_struct *work)
2253 {
2254         struct ieee80211_sub_if_data *sdata =
2255                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2256         struct ieee80211_local *local = sdata->local;
2257         struct ieee80211_if_managed *ifmgd;
2258         struct sk_buff *skb;
2259
2260         if (!netif_running(sdata->dev))
2261                 return;
2262
2263         if (local->sw_scanning || local->hw_scanning)
2264                 return;
2265
2266         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2267                 return;
2268
2269         /*
2270          * Nothing should have been stuffed into the workqueue during
2271          * the suspend->resume cycle. If this WARN is seen then there
2272          * is a bug with either the driver suspend or something in
2273          * mac80211 stuffing into the workqueue which we haven't yet
2274          * cleared during mac80211's suspend cycle.
2275          */
2276         if (WARN_ON(local->suspended))
2277                 return;
2278
2279         ifmgd = &sdata->u.mgd;
2280
2281         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2282                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2283
2284         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2285             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2286             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2287             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2288                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2289                                    round_jiffies_relative(0));
2290                 return;
2291         }
2292
2293         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2294                 if (ieee80211_sta_config_auth(sdata))
2295                         return;
2296                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2297         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2298                 return;
2299
2300         ieee80211_recalc_idle(local);
2301
2302         switch (ifmgd->state) {
2303         case IEEE80211_STA_MLME_DISABLED:
2304                 break;
2305         case IEEE80211_STA_MLME_DIRECT_PROBE:
2306                 ieee80211_direct_probe(sdata);
2307                 break;
2308         case IEEE80211_STA_MLME_AUTHENTICATE:
2309                 ieee80211_authenticate(sdata);
2310                 break;
2311         case IEEE80211_STA_MLME_ASSOCIATE:
2312                 ieee80211_associate(sdata);
2313                 break;
2314         case IEEE80211_STA_MLME_ASSOCIATED:
2315                 ieee80211_associated(sdata);
2316                 break;
2317         default:
2318                 WARN_ON(1);
2319                 break;
2320         }
2321
2322         if (ieee80211_privacy_mismatch(sdata)) {
2323                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2324                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2325
2326                 ieee80211_set_disassoc(sdata, false, true,
2327                                         WLAN_REASON_UNSPECIFIED);
2328         }
2329 }
2330
2331 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2332 {
2333         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2334                 /*
2335                  * Need to update last_beacon to avoid beacon loss
2336                  * test to trigger.
2337                  */
2338                 sdata->u.mgd.last_beacon = jiffies;
2339
2340
2341                 queue_work(sdata->local->hw.workqueue,
2342                            &sdata->u.mgd.work);
2343         }
2344 }
2345
2346 #ifdef CONFIG_PM
2347 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2348 {
2349         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2350
2351         /*
2352          * we need to use atomic bitops for the running bits
2353          * only because both timers might fire at the same
2354          * time -- the code here is properly synchronised.
2355          */
2356
2357         cancel_work_sync(&ifmgd->work);
2358         cancel_work_sync(&ifmgd->beacon_loss_work);
2359         if (del_timer_sync(&ifmgd->timer))
2360                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2361
2362         cancel_work_sync(&ifmgd->chswitch_work);
2363         if (del_timer_sync(&ifmgd->chswitch_timer))
2364                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2365 }
2366
2367 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2368 {
2369         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2370
2371         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2372                 add_timer(&ifmgd->timer);
2373         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2374                 add_timer(&ifmgd->chswitch_timer);
2375 }
2376 #endif
2377
2378 /* interface setup */
2379 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2380 {
2381         struct ieee80211_if_managed *ifmgd;
2382         u32 hw_flags;
2383
2384         ifmgd = &sdata->u.mgd;
2385         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2386         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2387         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2388         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2389                     (unsigned long) sdata);
2390         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2391                     (unsigned long) sdata);
2392         skb_queue_head_init(&ifmgd->skb_queue);
2393
2394         ifmgd->capab = WLAN_CAPABILITY_ESS;
2395         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2396                 IEEE80211_AUTH_ALG_SHARED_KEY;
2397         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2398                 IEEE80211_STA_AUTO_BSSID_SEL |
2399                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2400         if (sdata->local->hw.queues >= 4)
2401                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2402
2403         hw_flags = sdata->local->hw.flags;
2404
2405         if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
2406                 ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
2407                 sdata->local->hw.conf.dynamic_ps_timeout = 500;
2408         }
2409 }
2410
2411 /* configuration hooks */
2412 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2413 {
2414         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2415         struct ieee80211_local *local = sdata->local;
2416
2417         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2418                 return;
2419
2420         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2421                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2422             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2423                              IEEE80211_STA_AUTO_SSID_SEL))) {
2424
2425                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2426                         ieee80211_set_disassoc(sdata, true, true,
2427                                                WLAN_REASON_DEAUTH_LEAVING);
2428
2429                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2430                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2431                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2432                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2433                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2434                 queue_work(local->hw.workqueue, &ifmgd->work);
2435         }
2436 }
2437
2438 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2439 {
2440         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2441
2442         if (ifmgd->ssid_len)
2443                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2444         else
2445                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2446
2447         return 0;
2448 }
2449
2450 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2451 {
2452         struct ieee80211_if_managed *ifmgd;
2453
2454         if (len > IEEE80211_MAX_SSID_LEN)
2455                 return -EINVAL;
2456
2457         ifmgd = &sdata->u.mgd;
2458
2459         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2460                 /*
2461                  * Do not use reassociation if SSID is changed (different ESS).
2462                  */
2463                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2464                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2465                 memcpy(ifmgd->ssid, ssid, len);
2466                 ifmgd->ssid_len = len;
2467         }
2468
2469         return ieee80211_sta_commit(sdata);
2470 }
2471
2472 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2473 {
2474         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2475         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2476         *len = ifmgd->ssid_len;
2477         return 0;
2478 }
2479
2480 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2481 {
2482         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2483
2484         if (is_valid_ether_addr(bssid)) {
2485                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2486                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2487         } else {
2488                 memset(ifmgd->bssid, 0, ETH_ALEN);
2489                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2490         }
2491
2492         return ieee80211_sta_commit(sdata);
2493 }
2494
2495 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2496                                const char *ie, size_t len)
2497 {
2498         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2499
2500         if (len == 0 && ifmgd->extra_ie_len == 0)
2501                 return -EALREADY;
2502
2503         if (len == ifmgd->extra_ie_len && ifmgd->extra_ie &&
2504             memcmp(ifmgd->extra_ie, ie, len) == 0)
2505                 return -EALREADY;
2506
2507         kfree(ifmgd->extra_ie);
2508         if (len == 0) {
2509                 ifmgd->extra_ie = NULL;
2510                 ifmgd->extra_ie_len = 0;
2511                 return 0;
2512         }
2513         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2514         if (!ifmgd->extra_ie) {
2515                 ifmgd->extra_ie_len = 0;
2516                 return -ENOMEM;
2517         }
2518         memcpy(ifmgd->extra_ie, ie, len);
2519         ifmgd->extra_ie_len = len;
2520         return 0;
2521 }
2522
2523 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2524 {
2525         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2526                sdata->dev->name, reason);
2527
2528         ieee80211_set_disassoc(sdata, true, true, reason);
2529         return 0;
2530 }
2531
2532 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2533 {
2534         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2535
2536         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2537                sdata->dev->name, reason);
2538
2539         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2540                 return -ENOLINK;
2541
2542         ieee80211_set_disassoc(sdata, false, true, reason);
2543         return 0;
2544 }
2545
2546 /* scan finished notification */
2547 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2548 {
2549         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2550
2551         /* Restart STA timers */
2552         rcu_read_lock();
2553         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2554                 ieee80211_restart_sta_timer(sdata);
2555         rcu_read_unlock();
2556 }
2557
2558 int ieee80211_max_network_latency(struct notifier_block *nb,
2559                                   unsigned long data, void *dummy)
2560 {
2561         s32 latency_usec = (s32) data;
2562         struct ieee80211_local *local =
2563                 container_of(nb, struct ieee80211_local,
2564                              network_latency_notifier);
2565
2566         mutex_lock(&local->iflist_mtx);
2567         ieee80211_recalc_ps(local, latency_usec);
2568         mutex_unlock(&local->iflist_mtx);
2569
2570         return 0;
2571 }