SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 "rate.h"
  27 #include "led.h"
  28
  29 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  31 #define IEEE80211_AUTH_MAX_TRIES 3
  32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  33 #define IEEE80211_ASSOC_MAX_TRIES 3
  34 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  35 #define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
  36 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  37
  38 /* utils */
  39 static int ecw2cw(int ecw)
  40 {
  41         return (1 << ecw) - 1;
  42 }
  43
  44 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  45 {
  46         u8 *end, *pos;
  47
  48         pos = bss->cbss.information_elements;
  49         if (pos == NULL)
  50                 return NULL;
  51         end = pos + bss->cbss.len_information_elements;
  52
  53         while (pos + 1 < end) {
  54                 if (pos + 2 + pos[1] > end)
  55                         break;
  56                 if (pos[0] == ie)
  57                         return pos;
  58                 pos += 2 + pos[1];
  59         }
  60
  61         return NULL;
  62 }
  63
  64 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  65                                       struct ieee80211_supported_band *sband,
  66                                       u32 *rates)
  67 {
  68         int i, j, count;
  69         *rates = 0;
  70         count = 0;
  71         for (i = 0; i < bss->supp_rates_len; i++) {
  72                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  73
  74                 for (j = 0; j < sband->n_bitrates; j++)
  75                         if (sband->bitrates[j].bitrate == rate) {
  76                                 *rates |= BIT(j);
  77                                 count++;
  78                                 break;
  79                         }
  80         }
  81
  82         return count;
  83 }
  84
  85 /*
  86  * ieee80211_enable_ht should be called only after the operating band
  87  * has been determined as ht configuration depends on the hw's
  88  * HT abilities for a specific band.
  89  */
  90 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
  91                                struct ieee80211_ht_info *hti,
  92                                u16 ap_ht_cap_flags)
  93 {
  94         struct ieee80211_local *local = sdata->local;
  95         struct ieee80211_supported_band *sband;
  96         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  97         struct ieee80211_bss_ht_conf ht;
  98         struct sta_info *sta;
  99         u32 changed = 0;
 100         bool enable_ht = true, ht_changed;
 101         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 102
 103         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 104
 105         memset(&ht, 0, sizeof(ht));
 106
 107         /* HT is not supported */
 108         if (!sband->ht_cap.ht_supported)
 109                 enable_ht = false;
 110
 111         /* check that channel matches the right operating channel */
 112         if (local->hw.conf.channel->center_freq !=
 113             ieee80211_channel_to_frequency(hti->control_chan))
 114                 enable_ht = false;
 115
 116         if (enable_ht) {
 117                 channel_type = NL80211_CHAN_HT20;
 118
 119                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 120                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 121                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 122                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 123                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 124                                 channel_type = NL80211_CHAN_HT40PLUS;
 125                                 break;
 126                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 127                                 channel_type = NL80211_CHAN_HT40MINUS;
 128                                 break;
 129                         }
 130                 }
 131         }
 132
 133         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 134                      channel_type != local->hw.conf.channel_type;
 135
 136         local->oper_channel_type = channel_type;
 137
 138         if (ht_changed) {
 139                 /* channel_type change automatically detected */
 140                 ieee80211_hw_config(local, 0);
 141
 142                 rcu_read_lock();
 143
 144                 sta = sta_info_get(local, ifmgd->bssid);
 145                 if (sta)
 146                         rate_control_rate_update(local, sband, sta,
 147                                                  IEEE80211_RC_HT_CHANGED);
 148
 149                 rcu_read_unlock();
 150
 151         }
 152
 153         /* disable HT */
 154         if (!enable_ht)
 155                 return 0;
 156
 157         ht.operation_mode = le16_to_cpu(hti->operation_mode);
 158
 159         /* if bss configuration changed store the new one */
 160         if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) {
 161                 changed |= BSS_CHANGED_HT;
 162                 sdata->vif.bss_conf.ht = ht;
 163         }
 164
 165         return changed;
 166 }
 167
 168 /* frame sending functions */
 169
 170 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 171 {
 172         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 173         struct ieee80211_local *local = sdata->local;
 174         struct sk_buff *skb;
 175         struct ieee80211_mgmt *mgmt;
 176         u8 *pos, *ies, *ht_ie;
 177         int i, len, count, rates_len, supp_rates_len;
 178         u16 capab;
 179         struct ieee80211_bss *bss;
 180         int wmm = 0;
 181         struct ieee80211_supported_band *sband;
 182         u32 rates = 0;
 183
 184         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 185                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
 186                             ifmgd->ssid_len);
 187         if (!skb) {
 188                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 189                        "frame\n", sdata->dev->name);
 190                 return;
 191         }
 192         skb_reserve(skb, local->hw.extra_tx_headroom);
 193
 194         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 195
 196         capab = ifmgd->capab;
 197
 198         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 199                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 200                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 201                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 202                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 203         }
 204
 205         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 206                                    local->hw.conf.channel->center_freq,
 207                                    ifmgd->ssid, ifmgd->ssid_len);
 208         if (bss) {
 209                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 210                         capab |= WLAN_CAPABILITY_PRIVACY;
 211                 if (bss->wmm_used)
 212                         wmm = 1;
 213
 214                 /* get all rates supported by the device and the AP as
 215                  * some APs don't like getting a superset of their rates
 216                  * in the association request (e.g. D-Link DAP 1353 in
 217                  * b-only mode) */
 218                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 219
 220                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 221                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 222                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 223
 224                 ieee80211_rx_bss_put(local, bss);
 225         } else {
 226                 rates = ~0;
 227                 rates_len = sband->n_bitrates;
 228         }
 229
 230         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 231         memset(mgmt, 0, 24);
 232         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 233         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 234         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 235
 236         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
 237                 skb_put(skb, 10);
 238                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 239                                                   IEEE80211_STYPE_REASSOC_REQ);
 240                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 241                 mgmt->u.reassoc_req.listen_interval =
 242                                 cpu_to_le16(local->hw.conf.listen_interval);
 243                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
 244                        ETH_ALEN);
 245         } else {
 246                 skb_put(skb, 4);
 247                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 248                                                   IEEE80211_STYPE_ASSOC_REQ);
 249                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 250                 mgmt->u.assoc_req.listen_interval =
 251                                 cpu_to_le16(local->hw.conf.listen_interval);
 252         }
 253
 254         /* SSID */
 255         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
 256         *pos++ = WLAN_EID_SSID;
 257         *pos++ = ifmgd->ssid_len;
 258         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
 259
 260         /* add all rates which were marked to be used above */
 261         supp_rates_len = rates_len;
 262         if (supp_rates_len > 8)
 263                 supp_rates_len = 8;
 264
 265         len = sband->n_bitrates;
 266         pos = skb_put(skb, supp_rates_len + 2);
 267         *pos++ = WLAN_EID_SUPP_RATES;
 268         *pos++ = supp_rates_len;
 269
 270         count = 0;
 271         for (i = 0; i < sband->n_bitrates; i++) {
 272                 if (BIT(i) & rates) {
 273                         int rate = sband->bitrates[i].bitrate;
 274                         *pos++ = (u8) (rate / 5);
 275                         if (++count == 8)
 276                                 break;
 277                 }
 278         }
 279
 280         if (rates_len > count) {
 281                 pos = skb_put(skb, rates_len - count + 2);
 282                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 283                 *pos++ = rates_len - count;
 284
 285                 for (i++; i < sband->n_bitrates; i++) {
 286                         if (BIT(i) & rates) {
 287                                 int rate = sband->bitrates[i].bitrate;
 288                                 *pos++ = (u8) (rate / 5);
 289                         }
 290                 }
 291         }
 292
 293         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 294                 /* 1. power capabilities */
 295                 pos = skb_put(skb, 4);
 296                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 297                 *pos++ = 2;
 298                 *pos++ = 0; /* min tx power */
 299                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 300
 301                 /* 2. supported channels */
 302                 /* TODO: get this in reg domain format */
 303                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 304                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 305                 *pos++ = 2 * sband->n_channels;
 306                 for (i = 0; i < sband->n_channels; i++) {
 307                         *pos++ = ieee80211_frequency_to_channel(
 308                                         sband->channels[i].center_freq);
 309                         *pos++ = 1; /* one channel in the subband*/
 310                 }
 311         }
 312
 313         if (ifmgd->extra_ie) {
 314                 pos = skb_put(skb, ifmgd->extra_ie_len);
 315                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
 316         }
 317
 318         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 319                 pos = skb_put(skb, 9);
 320                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 321                 *pos++ = 7; /* len */
 322                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 323                 *pos++ = 0x50;
 324                 *pos++ = 0xf2;
 325                 *pos++ = 2; /* WME */
 326                 *pos++ = 0; /* WME info */
 327                 *pos++ = 1; /* WME ver */
 328                 *pos++ = 0;
 329         }
 330
 331         /* wmm support is a must to HT */
 332         /*
 333          * IEEE802.11n does not allow TKIP/WEP as pairwise
 334          * ciphers in HT mode. We still associate in non-ht
 335          * mode (11a/b/g) if any one of these ciphers is
 336          * configured as pairwise.
 337          */
 338         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 339             sband->ht_cap.ht_supported &&
 340             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 341             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 342             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 343                 struct ieee80211_ht_info *ht_info =
 344                         (struct ieee80211_ht_info *)(ht_ie + 2);
 345                 u16 cap = sband->ht_cap.cap;
 346                 __le16 tmp;
 347                 u32 flags = local->hw.conf.channel->flags;
 348
 349                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 350                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 351                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 352                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 353                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 354                         }
 355                         break;
 356                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 357                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 358                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 359                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 360                         }
 361                         break;
 362                 }
 363
 364                 tmp = cpu_to_le16(cap);
 365                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 366                 *pos++ = WLAN_EID_HT_CAPABILITY;
 367                 *pos++ = sizeof(struct ieee80211_ht_cap);
 368                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 369                 memcpy(pos, &tmp, sizeof(u16));
 370                 pos += sizeof(u16);
 371                 /* TODO: needs a define here for << 2 */
 372                 *pos++ = sband->ht_cap.ampdu_factor |
 373                          (sband->ht_cap.ampdu_density << 2);
 374                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 375         }
 376
 377         kfree(ifmgd->assocreq_ies);
 378         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
 379         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
 380         if (ifmgd->assocreq_ies)
 381                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
 382
 383         ieee80211_tx_skb(sdata, skb, 0);
 384 }
 385
 386
 387 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 388                                            u16 stype, u16 reason)
 389 {
 390         struct ieee80211_local *local = sdata->local;
 391         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 392         struct sk_buff *skb;
 393         struct ieee80211_mgmt *mgmt;
 394
 395         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 396         if (!skb) {
 397                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 398                        "deauth/disassoc frame\n", sdata->dev->name);
 399                 return;
 400         }
 401         skb_reserve(skb, local->hw.extra_tx_headroom);
 402
 403         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 404         memset(mgmt, 0, 24);
 405         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 406         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 407         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 408         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 409         skb_put(skb, 2);
 410         /* u.deauth.reason_code == u.disassoc.reason_code */
 411         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 412
 413         if (stype == IEEE80211_STYPE_DEAUTH)
 414                 cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
 415         else
 416                 cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
 417         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 418 }
 419
 420 void ieee80211_send_pspoll(struct ieee80211_local *local,
 421                            struct ieee80211_sub_if_data *sdata)
 422 {
 423         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 424         struct ieee80211_pspoll *pspoll;
 425         struct sk_buff *skb;
 426         u16 fc;
 427
 428         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 429         if (!skb) {
 430                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 431                        "pspoll frame\n", sdata->dev->name);
 432                 return;
 433         }
 434         skb_reserve(skb, local->hw.extra_tx_headroom);
 435
 436         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 437         memset(pspoll, 0, sizeof(*pspoll));
 438         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 439         pspoll->frame_control = cpu_to_le16(fc);
 440         pspoll->aid = cpu_to_le16(ifmgd->aid);
 441
 442         /* aid in PS-Poll has its two MSBs each set to 1 */
 443         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 444
 445         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 446         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 447
 448         ieee80211_tx_skb(sdata, skb, 0);
 449 }
 450
 451 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 452                              struct ieee80211_sub_if_data *sdata,
 453                              int powersave)
 454 {
 455         struct sk_buff *skb;
 456         struct ieee80211_hdr *nullfunc;
 457         __le16 fc;
 458
 459         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 460                 return;
 461
 462         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 463         if (!skb) {
 464                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 465                        "frame\n", sdata->dev->name);
 466                 return;
 467         }
 468         skb_reserve(skb, local->hw.extra_tx_headroom);
 469
 470         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 471         memset(nullfunc, 0, 24);
 472         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 473                          IEEE80211_FCTL_TODS);
 474         if (powersave)
 475                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 476         nullfunc->frame_control = fc;
 477         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 478         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 479         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 480
 481         ieee80211_tx_skb(sdata, skb, 0);
 482 }
 483
 484 /* powersave */
 485 static void ieee80211_enable_ps(struct ieee80211_local *local,
 486                                 struct ieee80211_sub_if_data *sdata)
 487 {
 488         struct ieee80211_conf *conf = &local->hw.conf;
 489
 490         /*
 491          * If we are scanning right now then the parameters will
 492          * take effect when scan finishes.
 493          */
 494         if (local->hw_scanning || local->sw_scanning)
 495                 return;
 496
 497         if (conf->dynamic_ps_timeout > 0 &&
 498             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 499                 mod_timer(&local->dynamic_ps_timer, jiffies +
 500                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 501         } else {
 502                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 503                         ieee80211_send_nullfunc(local, sdata, 1);
 504                 conf->flags |= IEEE80211_CONF_PS;
 505                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 506         }
 507 }
 508
 509 static void ieee80211_change_ps(struct ieee80211_local *local)
 510 {
 511         struct ieee80211_conf *conf = &local->hw.conf;
 512
 513         if (local->ps_sdata) {
 514                 if (!(local->ps_sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED))
 515                         return;
 516
 517                 ieee80211_enable_ps(local, local->ps_sdata);
 518         } else if (conf->flags & IEEE80211_CONF_PS) {
 519                 conf->flags &= ~IEEE80211_CONF_PS;
 520                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 521                 del_timer_sync(&local->dynamic_ps_timer);
 522                 cancel_work_sync(&local->dynamic_ps_enable_work);
 523         }
 524 }
 525
 526 /* need to hold RTNL or interface lock */
 527 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 528 {
 529         struct ieee80211_sub_if_data *sdata, *found = NULL;
 530         int count = 0;
 531
 532         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 533                 local->ps_sdata = NULL;
 534                 return;
 535         }
 536
 537         list_for_each_entry(sdata, &local->interfaces, list) {
 538                 if (!netif_running(sdata->dev))
 539                         continue;
 540                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 541                         continue;
 542                 found = sdata;
 543                 count++;
 544         }
 545
 546         if (count == 1 && found->u.mgd.powersave) {
 547                 s32 beaconint_us;
 548
 549                 if (latency < 0)
 550                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 551
 552                 beaconint_us = ieee80211_tu_to_usec(
 553                                         found->vif.bss_conf.beacon_int);
 554
 555                 if (beaconint_us > latency) {
 556                         local->ps_sdata = NULL;
 557                 } else {
 558                         u8 dtimper = found->vif.bss_conf.dtim_period;
 559                         int maxslp = 1;
 560
 561                         if (dtimper > 1)
 562                                 maxslp = min_t(int, dtimper,
 563                                                     latency / beaconint_us);
 564
 565                         local->hw.conf.max_sleep_interval = maxslp;
 566                         local->ps_sdata = found;
 567                 }
 568         } else {
 569                 local->ps_sdata = NULL;
 570         }
 571
 572         ieee80211_change_ps(local);
 573 }
 574
 575 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 576 {
 577         struct ieee80211_local *local =
 578                 container_of(work, struct ieee80211_local,
 579                              dynamic_ps_disable_work);
 580
 581         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 582                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 583                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 584         }
 585
 586         ieee80211_wake_queues_by_reason(&local->hw,
 587                                         IEEE80211_QUEUE_STOP_REASON_PS);
 588 }
 589
 590 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 591 {
 592         struct ieee80211_local *local =
 593                 container_of(work, struct ieee80211_local,
 594                              dynamic_ps_enable_work);
 595         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 596
 597         /* can only happen when PS was just disabled anyway */
 598         if (!sdata)
 599                 return;
 600
 601         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 602                 return;
 603
 604         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 605                 ieee80211_send_nullfunc(local, sdata, 1);
 606
 607         local->hw.conf.flags |= IEEE80211_CONF_PS;
 608         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 609 }
 610
 611 void ieee80211_dynamic_ps_timer(unsigned long data)
 612 {
 613         struct ieee80211_local *local = (void *) data;
 614
 615         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
 616 }
 617
 618 /* MLME */
 619 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 620                                      struct ieee80211_if_managed *ifmgd,
 621                                      u8 *wmm_param, size_t wmm_param_len)
 622 {
 623         struct ieee80211_tx_queue_params params;
 624         size_t left;
 625         int count;
 626         u8 *pos;
 627
 628         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 629                 return;
 630
 631         if (!wmm_param)
 632                 return;
 633
 634         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 635                 return;
 636         count = wmm_param[6] & 0x0f;
 637         if (count == ifmgd->wmm_last_param_set)
 638                 return;
 639         ifmgd->wmm_last_param_set = count;
 640
 641         pos = wmm_param + 8;
 642         left = wmm_param_len - 8;
 643
 644         memset(&params, 0, sizeof(params));
 645
 646         local->wmm_acm = 0;
 647         for (; left >= 4; left -= 4, pos += 4) {
 648                 int aci = (pos[0] >> 5) & 0x03;
 649                 int acm = (pos[0] >> 4) & 0x01;
 650                 int queue;
 651
 652                 switch (aci) {
 653                 case 1: /* AC_BK */
 654                         queue = 3;
 655                         if (acm)
 656                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 657                         break;
 658                 case 2: /* AC_VI */
 659                         queue = 1;
 660                         if (acm)
 661                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 662                         break;
 663                 case 3: /* AC_VO */
 664                         queue = 0;
 665                         if (acm)
 666                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 667                         break;
 668                 case 0: /* AC_BE */
 669                 default:
 670                         queue = 2;
 671                         if (acm)
 672                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 673                         break;
 674                 }
 675
 676                 params.aifs = pos[0] & 0x0f;
 677                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 678                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 679                 params.txop = get_unaligned_le16(pos + 2);
 680 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 681                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 682                        "cWmin=%d cWmax=%d txop=%d\n",
 683                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 684                        params.cw_max, params.txop);
 685 #endif
 686                 if (local->ops->conf_tx &&
 687                     local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 688                         printk(KERN_DEBUG "%s: failed to set TX queue "
 689                                "parameters for queue %d\n", local->mdev->name, queue);
 690                 }
 691         }
 692 }
 693
 694 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 695                                            u16 capab, bool erp_valid, u8 erp)
 696 {
 697         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 698 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 699         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 700 #endif
 701         u32 changed = 0;
 702         bool use_protection;
 703         bool use_short_preamble;
 704         bool use_short_slot;
 705
 706         if (erp_valid) {
 707                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 708                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 709         } else {
 710                 use_protection = false;
 711                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 712         }
 713
 714         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 715
 716         if (use_protection != bss_conf->use_cts_prot) {
 717 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 718                 if (net_ratelimit()) {
 719                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 720                                sdata->dev->name,
 721                                use_protection ? "enabled" : "disabled",
 722                                ifmgd->bssid);
 723                 }
 724 #endif
 725                 bss_conf->use_cts_prot = use_protection;
 726                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 727         }
 728
 729         if (use_short_preamble != bss_conf->use_short_preamble) {
 730 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 731                 if (net_ratelimit()) {
 732                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 733                                " (BSSID=%pM)\n",
 734                                sdata->dev->name,
 735                                use_short_preamble ? "short" : "long",
 736                                ifmgd->bssid);
 737                 }
 738 #endif
 739                 bss_conf->use_short_preamble = use_short_preamble;
 740                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 741         }
 742
 743         if (use_short_slot != bss_conf->use_short_slot) {
 744 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 745                 if (net_ratelimit()) {
 746                         printk(KERN_DEBUG "%s: switched to %s slot time"
 747                                " (BSSID=%pM)\n",
 748                                sdata->dev->name,
 749                                use_short_slot ? "short" : "long",
 750                                ifmgd->bssid);
 751                 }
 752 #endif
 753                 bss_conf->use_short_slot = use_short_slot;
 754                 changed |= BSS_CHANGED_ERP_SLOT;
 755         }
 756
 757         return changed;
 758 }
 759
 760 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 761 {
 762         union iwreq_data wrqu;
 763
 764         memset(&wrqu, 0, sizeof(wrqu));
 765         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 766                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 767         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 768         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 769 }
 770
 771 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 772 {
 773         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 774         char *buf;
 775         size_t len;
 776         int i;
 777         union iwreq_data wrqu;
 778
 779         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 780                 return;
 781
 782         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 783                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 784         if (!buf)
 785                 return;
 786
 787         len = sprintf(buf, "ASSOCINFO(");
 788         if (ifmgd->assocreq_ies) {
 789                 len += sprintf(buf + len, "ReqIEs=");
 790                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 791                         len += sprintf(buf + len, "%02x",
 792                                        ifmgd->assocreq_ies[i]);
 793                 }
 794         }
 795         if (ifmgd->assocresp_ies) {
 796                 if (ifmgd->assocreq_ies)
 797                         len += sprintf(buf + len, " ");
 798                 len += sprintf(buf + len, "RespIEs=");
 799                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 800                         len += sprintf(buf + len, "%02x",
 801                                        ifmgd->assocresp_ies[i]);
 802                 }
 803         }
 804         len += sprintf(buf + len, ")");
 805
 806         if (len > IW_CUSTOM_MAX) {
 807                 len = sprintf(buf, "ASSOCRESPIE=");
 808                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 809                         len += sprintf(buf + len, "%02x",
 810                                        ifmgd->assocresp_ies[i]);
 811                 }
 812         }
 813
 814         if (len <= IW_CUSTOM_MAX) {
 815                 memset(&wrqu, 0, sizeof(wrqu));
 816                 wrqu.data.length = len;
 817                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 818         }
 819
 820         kfree(buf);
 821 }
 822
 823
 824 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 825                                      u32 bss_info_changed)
 826 {
 827         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 828         struct ieee80211_local *local = sdata->local;
 829         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 830
 831         struct ieee80211_bss *bss;
 832
 833         bss_info_changed |= BSS_CHANGED_ASSOC;
 834         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 835
 836         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 837                                    conf->channel->center_freq,
 838                                    ifmgd->ssid, ifmgd->ssid_len);
 839         if (bss) {
 840                 /* set timing information */
 841                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 842                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 843                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 844
 845                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 846                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 847
 848                 cfg80211_hold_bss(&bss->cbss);
 849
 850                 ieee80211_rx_bss_put(local, bss);
 851         }
 852
 853         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 854         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 855         ieee80211_sta_send_associnfo(sdata);
 856
 857         ifmgd->last_probe = jiffies;
 858         ieee80211_led_assoc(local, 1);
 859
 860         sdata->vif.bss_conf.assoc = 1;
 861         /*
 862          * For now just always ask the driver to update the basic rateset
 863          * when we have associated, we aren't checking whether it actually
 864          * changed or not.
 865          */
 866         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 867         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 868
 869         /* will be same as sdata */
 870         if (local->ps_sdata) {
 871                 mutex_lock(&local->iflist_mtx);
 872                 ieee80211_recalc_ps(local, -1);
 873                 mutex_unlock(&local->iflist_mtx);
 874         }
 875
 876         netif_tx_start_all_queues(sdata->dev);
 877         netif_carrier_on(sdata->dev);
 878
 879         ieee80211_sta_send_apinfo(sdata);
 880 }
 881
 882 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 883 {
 884         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 885         struct ieee80211_local *local = sdata->local;
 886
 887         ifmgd->direct_probe_tries++;
 888         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 889                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 890                        sdata->dev->name, ifmgd->bssid);
 891                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 892                 ieee80211_sta_send_apinfo(sdata);
 893
 894                 /*
 895                  * Most likely AP is not in the range so remove the
 896                  * bss information associated to the AP
 897                  */
 898                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 899                                 sdata->local->hw.conf.channel->center_freq,
 900                                 ifmgd->ssid, ifmgd->ssid_len);
 901
 902                 /*
 903                  * We might have a pending scan which had no chance to run yet
 904                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
 905                  * Hence, queue the STAs work again
 906                  */
 907                 queue_work(local->hw.workqueue, &ifmgd->work);
 908                 return;
 909         }
 910
 911         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 912                         sdata->dev->name, ifmgd->bssid,
 913                         ifmgd->direct_probe_tries);
 914
 915         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 916
 917         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
 918
 919         /* Direct probe is sent to broadcast address as some APs
 920          * will not answer to direct packet in unassociated state.
 921          */
 922         ieee80211_send_probe_req(sdata, NULL,
 923                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 924
 925         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 926 }
 927
 928
 929 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 930 {
 931         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 932         struct ieee80211_local *local = sdata->local;
 933         u8 *ies;
 934         size_t ies_len;
 935
 936         ifmgd->auth_tries++;
 937         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 938                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 939                        " timed out\n",
 940                        sdata->dev->name, ifmgd->bssid);
 941                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 942                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
 943                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 944                                 sdata->local->hw.conf.channel->center_freq,
 945                                 ifmgd->ssid, ifmgd->ssid_len);
 946
 947                 /*
 948                  * We might have a pending scan which had no chance to run yet
 949                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
 950                  * Hence, queue the STAs work again
 951                  */
 952                 queue_work(local->hw.workqueue, &ifmgd->work);
 953                 return;
 954         }
 955
 956         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 957         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 958                sdata->dev->name, ifmgd->bssid);
 959
 960         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 961                 ies = ifmgd->sme_auth_ie;
 962                 ies_len = ifmgd->sme_auth_ie_len;
 963         } else {
 964                 ies = NULL;
 965                 ies_len = 0;
 966         }
 967         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
 968                             ifmgd->bssid, 0);
 969         ifmgd->auth_transaction = 2;
 970
 971         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 972 }
 973
 974 /*
 975  * The disassoc 'reason' argument can be either our own reason
 976  * if self disconnected or a reason code from the AP.
 977  */
 978 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 979                                    bool deauth, bool self_disconnected,
 980                                    u16 reason)
 981 {
 982         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 983         struct ieee80211_local *local = sdata->local;
 984         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 985         struct ieee80211_bss *bss;
 986         struct sta_info *sta;
 987         u32 changed = 0, config_changed = 0;
 988
 989         rcu_read_lock();
 990
 991         sta = sta_info_get(local, ifmgd->bssid);
 992         if (!sta) {
 993                 rcu_read_unlock();
 994                 return;
 995         }
 996
 997         if (deauth) {
 998                 ifmgd->direct_probe_tries = 0;
 999                 ifmgd->auth_tries = 0;
1000         }
1001         ifmgd->assoc_scan_tries = 0;
1002         ifmgd->assoc_tries = 0;
1003
1004         netif_tx_stop_all_queues(sdata->dev);
1005         netif_carrier_off(sdata->dev);
1006
1007         ieee80211_sta_tear_down_BA_sessions(sta);
1008
1009         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1010                                    conf->channel->center_freq,
1011                                    ifmgd->ssid, ifmgd->ssid_len);
1012
1013         if (bss) {
1014                 cfg80211_unhold_bss(&bss->cbss);
1015                 ieee80211_rx_bss_put(local, bss);
1016         }
1017
1018         if (self_disconnected) {
1019                 if (deauth)
1020                         ieee80211_send_deauth_disassoc(sdata,
1021                                 IEEE80211_STYPE_DEAUTH, reason);
1022                 else
1023                         ieee80211_send_deauth_disassoc(sdata,
1024                                 IEEE80211_STYPE_DISASSOC, reason);
1025         }
1026
1027         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1028         changed |= ieee80211_reset_erp_info(sdata);
1029
1030         ieee80211_led_assoc(local, 0);
1031         changed |= BSS_CHANGED_ASSOC;
1032         sdata->vif.bss_conf.assoc = false;
1033
1034         ieee80211_sta_send_apinfo(sdata);
1035
1036         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
1037                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1038                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1039                                 sdata->local->hw.conf.channel->center_freq,
1040                                 ifmgd->ssid, ifmgd->ssid_len);
1041         }
1042
1043         rcu_read_unlock();
1044
1045         /* channel(_type) changes are handled by ieee80211_hw_config */
1046         local->oper_channel_type = NL80211_CHAN_NO_HT;
1047
1048         local->power_constr_level = 0;
1049
1050         del_timer_sync(&local->dynamic_ps_timer);
1051         cancel_work_sync(&local->dynamic_ps_enable_work);
1052
1053         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1054                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1055                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1056         }
1057
1058         ieee80211_hw_config(local, config_changed);
1059         ieee80211_bss_info_change_notify(sdata, changed);
1060
1061         rcu_read_lock();
1062
1063         sta = sta_info_get(local, ifmgd->bssid);
1064         if (!sta) {
1065                 rcu_read_unlock();
1066                 return;
1067         }
1068
1069         sta_info_unlink(&sta);
1070
1071         rcu_read_unlock();
1072
1073         sta_info_destroy(sta);
1074 }
1075
1076 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1077 {
1078         if (!sdata || !sdata->default_key ||
1079             sdata->default_key->conf.alg != ALG_WEP)
1080                 return 0;
1081         return 1;
1082 }
1083
1084 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
1085 {
1086         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1087         struct ieee80211_local *local = sdata->local;
1088         struct ieee80211_bss *bss;
1089         int bss_privacy;
1090         int wep_privacy;
1091         int privacy_invoked;
1092
1093         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
1094                 return 0;
1095
1096         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
1097                                    local->hw.conf.channel->center_freq,
1098                                    ifmgd->ssid, ifmgd->ssid_len);
1099         if (!bss)
1100                 return 0;
1101
1102         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1103         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1104         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
1105
1106         ieee80211_rx_bss_put(local, bss);
1107
1108         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1109                 return 0;
1110
1111         return 1;
1112 }
1113
1114 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
1115 {
1116         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1117         struct ieee80211_local *local = sdata->local;
1118
1119         ifmgd->assoc_tries++;
1120         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1121                 printk(KERN_DEBUG "%s: association with AP %pM"
1122                        " timed out\n",
1123                        sdata->dev->name, ifmgd->bssid);
1124                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1125                 cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid);
1126                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
1127                                 sdata->local->hw.conf.channel->center_freq,
1128                                 ifmgd->ssid, ifmgd->ssid_len);
1129                 /*
1130                  * We might have a pending scan which had no chance to run yet
1131                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
1132                  * Hence, queue the STAs work again
1133                  */
1134                 queue_work(local->hw.workqueue, &ifmgd->work);
1135                 return;
1136         }
1137
1138         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1139         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1140                sdata->dev->name, ifmgd->bssid);
1141         if (ieee80211_privacy_mismatch(sdata)) {
1142                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1143                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1144                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1145                 return;
1146         }
1147
1148         ieee80211_send_assoc(sdata);
1149
1150         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1151 }
1152
1153 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1154                              struct ieee80211_hdr *hdr)
1155 {
1156         /*
1157          * We can postpone the mgd.timer whenever receiving unicast frames
1158          * from AP because we know that the connection is working both ways
1159          * at that time. But multicast frames (and hence also beacons) must
1160          * be ignored here, because we need to trigger the timer during
1161          * data idle periods for sending the periodical probe request to
1162          * the AP.
1163          */
1164         if (!is_multicast_ether_addr(hdr->addr1))
1165                 mod_timer(&sdata->u.mgd.timer,
1166                           jiffies + IEEE80211_MONITORING_INTERVAL);
1167 }
1168
1169 void ieee80211_beacon_loss_work(struct work_struct *work)
1170 {
1171         struct ieee80211_sub_if_data *sdata =
1172                 container_of(work, struct ieee80211_sub_if_data,
1173                              u.mgd.beacon_loss_work);
1174         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1175
1176 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1177         if (net_ratelimit()) {
1178                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
1179                        "- sending probe request\n", sdata->dev->name,
1180                        sdata->u.mgd.bssid);
1181         }
1182 #endif
1183
1184         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1185         ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1186                                  ifmgd->ssid_len, NULL, 0);
1187
1188         mod_timer(&ifmgd->timer, jiffies + IEEE80211_MONITORING_INTERVAL);
1189 }
1190
1191 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1192 {
1193         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1194
1195         queue_work(sdata->local->hw.workqueue,
1196                    &sdata->u.mgd.beacon_loss_work);
1197 }
1198 EXPORT_SYMBOL(ieee80211_beacon_loss);
1199
1200 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
1201 {
1202         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1203         struct ieee80211_local *local = sdata->local;
1204         struct sta_info *sta;
1205         bool disassoc = false;
1206
1207         /* TODO: start monitoring current AP signal quality and number of
1208          * missed beacons. Scan other channels every now and then and search
1209          * for better APs. */
1210         /* TODO: remove expired BSSes */
1211
1212         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
1213
1214         rcu_read_lock();
1215
1216         sta = sta_info_get(local, ifmgd->bssid);
1217         if (!sta) {
1218                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1219                        sdata->dev->name, ifmgd->bssid);
1220                 disassoc = true;
1221                 goto unlock;
1222         }
1223
1224         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
1225             time_after(jiffies, sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1226                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
1227                        "- disassociating\n",
1228                        sdata->dev->name, ifmgd->bssid);
1229                 disassoc = true;
1230                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1231                 goto unlock;
1232         }
1233
1234         /*
1235          * Beacon filtering is only enabled with power save and then the
1236          * stack should not check for beacon loss.
1237          */
1238         if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1239               (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1240             time_after(jiffies,
1241                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1242 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1243                 if (net_ratelimit()) {
1244                         printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1245                                "- sending probe request\n",
1246                                sdata->dev->name, ifmgd->bssid);
1247                 }
1248 #endif
1249                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1250                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1251                                          ifmgd->ssid_len, NULL, 0);
1252                 goto unlock;
1253
1254         }
1255
1256         if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1257                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1258                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1259                                          ifmgd->ssid_len, NULL, 0);
1260         }
1261
1262  unlock:
1263         rcu_read_unlock();
1264
1265         if (disassoc)
1266                 ieee80211_set_disassoc(sdata, true, true,
1267                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1268         else
1269                 mod_timer(&ifmgd->timer, jiffies +
1270                                       IEEE80211_MONITORING_INTERVAL);
1271 }
1272
1273
1274 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1275 {
1276         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1277
1278         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1279         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1280         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1281                 /* Wait for SME to request association */
1282                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1283         } else
1284                 ieee80211_associate(sdata);
1285 }
1286
1287
1288 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1289                                      struct ieee80211_mgmt *mgmt,
1290                                      size_t len)
1291 {
1292         u8 *pos;
1293         struct ieee802_11_elems elems;
1294
1295         pos = mgmt->u.auth.variable;
1296         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1297         if (!elems.challenge)
1298                 return;
1299         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1300                             elems.challenge - 2, elems.challenge_len + 2,
1301                             sdata->u.mgd.bssid, 1);
1302         sdata->u.mgd.auth_transaction = 4;
1303 }
1304
1305 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1306                                    struct ieee80211_mgmt *mgmt,
1307                                    size_t len)
1308 {
1309         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1310         u16 auth_alg, auth_transaction, status_code;
1311
1312         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1313                 return;
1314
1315         if (len < 24 + 6)
1316                 return;
1317
1318         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1319                 return;
1320
1321         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1322                 return;
1323
1324         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1325         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1326         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1327
1328         if (auth_alg != ifmgd->auth_alg ||
1329             auth_transaction != ifmgd->auth_transaction)
1330                 return;
1331
1332         if (status_code != WLAN_STATUS_SUCCESS) {
1333                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1334                         u8 algs[3];
1335                         const int num_algs = ARRAY_SIZE(algs);
1336                         int i, pos;
1337                         algs[0] = algs[1] = algs[2] = 0xff;
1338                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1339                                 algs[0] = WLAN_AUTH_OPEN;
1340                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1341                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1342                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1343                                 algs[2] = WLAN_AUTH_LEAP;
1344                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1345                                 pos = 0;
1346                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1347                                 pos = 1;
1348                         else
1349                                 pos = 2;
1350                         for (i = 0; i < num_algs; i++) {
1351                                 pos++;
1352                                 if (pos >= num_algs)
1353                                         pos = 0;
1354                                 if (algs[pos] == ifmgd->auth_alg ||
1355                                     algs[pos] == 0xff)
1356                                         continue;
1357                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1358                                     !ieee80211_sta_wep_configured(sdata))
1359                                         continue;
1360                                 ifmgd->auth_alg = algs[pos];
1361                                 break;
1362                         }
1363                 }
1364                 return;
1365         }
1366
1367         switch (ifmgd->auth_alg) {
1368         case WLAN_AUTH_OPEN:
1369         case WLAN_AUTH_LEAP:
1370         case WLAN_AUTH_FT:
1371                 ieee80211_auth_completed(sdata);
1372                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1373                 break;
1374         case WLAN_AUTH_SHARED_KEY:
1375                 if (ifmgd->auth_transaction == 4) {
1376                         ieee80211_auth_completed(sdata);
1377                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1378                 } else
1379                         ieee80211_auth_challenge(sdata, mgmt, len);
1380                 break;
1381         }
1382 }
1383
1384
1385 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1386                                      struct ieee80211_mgmt *mgmt,
1387                                      size_t len)
1388 {
1389         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1390         u16 reason_code;
1391
1392         if (len < 24 + 2)
1393                 return;
1394
1395         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1396                 return;
1397
1398         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1399
1400         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1401                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1402                                 sdata->dev->name, reason_code);
1403
1404         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1405             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1406              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1407              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1408                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1409                 mod_timer(&ifmgd->timer, jiffies +
1410                                       IEEE80211_RETRY_AUTH_INTERVAL);
1411         }
1412
1413         ieee80211_set_disassoc(sdata, true, false, 0);
1414         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1415         cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
1416 }
1417
1418
1419 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1420                                        struct ieee80211_mgmt *mgmt,
1421                                        size_t len)
1422 {
1423         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1424         u16 reason_code;
1425
1426         if (len < 24 + 2)
1427                 return;
1428
1429         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1430                 return;
1431
1432         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1433
1434         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1435                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1436                                 sdata->dev->name, reason_code);
1437
1438         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1439             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1440                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1441                 mod_timer(&ifmgd->timer, jiffies +
1442                                       IEEE80211_RETRY_AUTH_INTERVAL);
1443         }
1444
1445         ieee80211_set_disassoc(sdata, false, false, reason_code);
1446         cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
1447 }
1448
1449
1450 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1451                                          struct ieee80211_mgmt *mgmt,
1452                                          size_t len,
1453                                          int reassoc)
1454 {
1455         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1456         struct ieee80211_local *local = sdata->local;
1457         struct ieee80211_supported_band *sband;
1458         struct sta_info *sta;
1459         u32 rates, basic_rates;
1460         u16 capab_info, status_code, aid;
1461         struct ieee802_11_elems elems;
1462         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1463         u8 *pos;
1464         u32 changed = 0;
1465         int i, j;
1466         bool have_higher_than_11mbit = false, newsta = false;
1467         u16 ap_ht_cap_flags;
1468
1469         /* AssocResp and ReassocResp have identical structure, so process both
1470          * of them in this function. */
1471
1472         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1473                 return;
1474
1475         if (len < 24 + 6)
1476                 return;
1477
1478         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1479                 return;
1480
1481         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1482         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1483         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1484
1485         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1486                "status=%d aid=%d)\n",
1487                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1488                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1489
1490         pos = mgmt->u.assoc_resp.variable;
1491         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1492
1493         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1494             elems.timeout_int && elems.timeout_int_len == 5 &&
1495             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1496                 u32 tu, ms;
1497                 tu = get_unaligned_le32(elems.timeout_int + 1);
1498                 ms = tu * 1024 / 1000;
1499                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1500                        "comeback duration %u TU (%u ms)\n",
1501                        sdata->dev->name, tu, ms);
1502                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1503                         mod_timer(&ifmgd->timer,
1504                                   jiffies + msecs_to_jiffies(ms));
1505                 return;
1506         }
1507
1508         if (status_code != WLAN_STATUS_SUCCESS) {
1509                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1510                        sdata->dev->name, status_code);
1511                 /* if this was a reassociation, ensure we try a "full"
1512                  * association next time. This works around some broken APs
1513                  * which do not correctly reject reassociation requests. */
1514                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1515                 cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1516                 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1517                         /* Wait for SME to decide what to do next */
1518                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1519                 }
1520                 return;
1521         }
1522
1523         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1524                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1525                        "set\n", sdata->dev->name, aid);
1526         aid &= ~(BIT(15) | BIT(14));
1527
1528         if (!elems.supp_rates) {
1529                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1530                        sdata->dev->name);
1531                 return;
1532         }
1533
1534         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1535         ifmgd->aid = aid;
1536         ifmgd->ap_capab = capab_info;
1537
1538         kfree(ifmgd->assocresp_ies);
1539         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1540         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1541         if (ifmgd->assocresp_ies)
1542                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1543
1544         rcu_read_lock();
1545
1546         /* Add STA entry for the AP */
1547         sta = sta_info_get(local, ifmgd->bssid);
1548         if (!sta) {
1549                 newsta = true;
1550
1551                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1552                 if (!sta) {
1553                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1554                                " the AP\n", sdata->dev->name);
1555                         rcu_read_unlock();
1556                         return;
1557                 }
1558
1559                 /* update new sta with its last rx activity */
1560                 sta->last_rx = jiffies;
1561         }
1562
1563         /*
1564          * FIXME: Do we really need to update the sta_info's information here?
1565          *        We already know about the AP (we found it in our list) so it
1566          *        should already be filled with the right info, no?
1567          *        As is stands, all this is racy because typically we assume
1568          *        the information that is filled in here (except flags) doesn't
1569          *        change while a STA structure is alive. As such, it should move
1570          *        to between the sta_info_alloc() and sta_info_insert() above.
1571          */
1572
1573         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1574                            WLAN_STA_AUTHORIZED);
1575
1576         rates = 0;
1577         basic_rates = 0;
1578         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1579
1580         for (i = 0; i < elems.supp_rates_len; i++) {
1581                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1582                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1583
1584                 if (rate > 110)
1585                         have_higher_than_11mbit = true;
1586
1587                 for (j = 0; j < sband->n_bitrates; j++) {
1588                         if (sband->bitrates[j].bitrate == rate) {
1589                                 rates |= BIT(j);
1590                                 if (is_basic)
1591                                         basic_rates |= BIT(j);
1592                                 break;
1593                         }
1594                 }
1595         }
1596
1597         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1598                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1599                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1600
1601                 if (rate > 110)
1602                         have_higher_than_11mbit = true;
1603
1604                 for (j = 0; j < sband->n_bitrates; j++) {
1605                         if (sband->bitrates[j].bitrate == rate) {
1606                                 rates |= BIT(j);
1607                                 if (is_basic)
1608                                         basic_rates |= BIT(j);
1609                                 break;
1610                         }
1611                 }
1612         }
1613
1614         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1615         sdata->vif.bss_conf.basic_rates = basic_rates;
1616
1617         /* cf. IEEE 802.11 9.2.12 */
1618         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1619             have_higher_than_11mbit)
1620                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1621         else
1622                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1623
1624         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1625         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1626                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1627                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1628
1629         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1630
1631         rate_control_rate_init(sta);
1632
1633         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1634                 set_sta_flags(sta, WLAN_STA_MFP);
1635
1636         if (elems.wmm_param)
1637                 set_sta_flags(sta, WLAN_STA_WME);
1638
1639         if (newsta) {
1640                 int err = sta_info_insert(sta);
1641                 if (err) {
1642                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1643                                " the AP (error %d)\n", sdata->dev->name, err);
1644                         rcu_read_unlock();
1645                         return;
1646                 }
1647         }
1648
1649         rcu_read_unlock();
1650
1651         if (elems.wmm_param)
1652                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1653                                          elems.wmm_param_len);
1654
1655         if (elems.ht_info_elem && elems.wmm_param &&
1656             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1657             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1658                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1659                                                ap_ht_cap_flags);
1660
1661         /* set AID and assoc capability,
1662          * ieee80211_set_associated() will tell the driver */
1663         bss_conf->aid = aid;
1664         bss_conf->assoc_capability = capab_info;
1665         ieee80211_set_associated(sdata, changed);
1666
1667         /*
1668          * initialise the time of last beacon to be the association time,
1669          * otherwise beacon loss check will trigger immediately
1670          */
1671         ifmgd->last_beacon = jiffies;
1672
1673         ieee80211_associated(sdata);
1674         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1675 }
1676
1677
1678 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1679                                   struct ieee80211_mgmt *mgmt,
1680                                   size_t len,
1681                                   struct ieee80211_rx_status *rx_status,
1682                                   struct ieee802_11_elems *elems,
1683                                   bool beacon)
1684 {
1685         struct ieee80211_local *local = sdata->local;
1686         int freq;
1687         struct ieee80211_bss *bss;
1688         struct ieee80211_channel *channel;
1689
1690         if (elems->ds_params && elems->ds_params_len == 1)
1691                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1692         else
1693                 freq = rx_status->freq;
1694
1695         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1696
1697         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1698                 return;
1699
1700         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1701                                         channel, beacon);
1702         if (!bss)
1703                 return;
1704
1705         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1706             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1707                 struct ieee80211_channel_sw_ie *sw_elem =
1708                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1709                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1710         }
1711
1712         ieee80211_rx_bss_put(local, bss);
1713 }
1714
1715
1716 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1717                                          struct ieee80211_mgmt *mgmt,
1718                                          size_t len,
1719                                          struct ieee80211_rx_status *rx_status)
1720 {
1721         struct ieee80211_if_managed *ifmgd;
1722         size_t baselen;
1723         struct ieee802_11_elems elems;
1724
1725         ifmgd = &sdata->u.mgd;
1726
1727         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1728                 return; /* ignore ProbeResp to foreign address */
1729
1730         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1731         if (baselen > len)
1732                 return;
1733
1734         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1735                                 &elems);
1736
1737         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1738
1739         /* direct probe may be part of the association flow */
1740         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1741                                &ifmgd->request)) {
1742                 printk(KERN_DEBUG "%s direct probe responded\n",
1743                        sdata->dev->name);
1744                 ieee80211_authenticate(sdata);
1745         }
1746
1747         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1748                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1749 }
1750
1751 /*
1752  * This is the canonical list of information elements we care about,
1753  * the filter code also gives us all changes to the Microsoft OUI
1754  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1755  *
1756  * We implement beacon filtering in software since that means we can
1757  * avoid processing the frame here and in cfg80211, and userspace
1758  * will not be able to tell whether the hardware supports it or not.
1759  *
1760  * XXX: This list needs to be dynamic -- userspace needs to be able to
1761  *      add items it requires. It also needs to be able to tell us to
1762  *      look out for other vendor IEs.
1763  */
1764 static const u64 care_about_ies =
1765         (1ULL << WLAN_EID_COUNTRY) |
1766         (1ULL << WLAN_EID_ERP_INFO) |
1767         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1768         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1769         (1ULL << WLAN_EID_HT_CAPABILITY) |
1770         (1ULL << WLAN_EID_HT_INFORMATION);
1771
1772 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1773                                      struct ieee80211_mgmt *mgmt,
1774                                      size_t len,
1775                                      struct ieee80211_rx_status *rx_status)
1776 {
1777         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1778         size_t baselen;
1779         struct ieee802_11_elems elems;
1780         struct ieee80211_local *local = sdata->local;
1781         u32 changed = 0;
1782         bool erp_valid, directed_tim = false;
1783         u8 erp_value = 0;
1784         u32 ncrc;
1785
1786         /* Process beacon from the current BSS */
1787         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1788         if (baselen > len)
1789                 return;
1790
1791         if (rx_status->freq != local->hw.conf.channel->center_freq)
1792                 return;
1793
1794         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1795             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1796                 return;
1797
1798         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1799         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1800                                           len - baselen, &elems,
1801                                           care_about_ies, ncrc);
1802
1803         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1804                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1805                                                    ifmgd->aid);
1806
1807         ncrc = crc32_be(ncrc, (void *)&directed_tim, sizeof(directed_tim));
1808
1809         if (ncrc == ifmgd->beacon_crc)
1810                 return;
1811         ifmgd->beacon_crc = ncrc;
1812
1813         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1814
1815         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1816                                  elems.wmm_param_len);
1817
1818         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1819                 if (directed_tim) {
1820                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1821                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1822                                 ieee80211_hw_config(local,
1823                                                     IEEE80211_CONF_CHANGE_PS);
1824                                 ieee80211_send_nullfunc(local, sdata, 0);
1825                         } else {
1826                                 local->pspolling = true;
1827
1828                                 /*
1829                                  * Here is assumed that the driver will be
1830                                  * able to send ps-poll frame and receive a
1831                                  * response even though power save mode is
1832                                  * enabled, but some drivers might require
1833                                  * to disable power save here. This needs
1834                                  * to be investigated.
1835                                  */
1836                                 ieee80211_send_pspoll(local, sdata);
1837                         }
1838                 }
1839         }
1840
1841         if (elems.erp_info && elems.erp_info_len >= 1) {
1842                 erp_valid = true;
1843                 erp_value = elems.erp_info[0];
1844         } else {
1845                 erp_valid = false;
1846         }
1847         changed |= ieee80211_handle_bss_capability(sdata,
1848                         le16_to_cpu(mgmt->u.beacon.capab_info),
1849                         erp_valid, erp_value);
1850
1851
1852         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1853             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1854                 struct sta_info *sta;
1855                 struct ieee80211_supported_band *sband;
1856                 u16 ap_ht_cap_flags;
1857
1858                 rcu_read_lock();
1859
1860                 sta = sta_info_get(local, ifmgd->bssid);
1861                 if (!sta) {
1862                         rcu_read_unlock();
1863                         return;
1864                 }
1865
1866                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1867
1868                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1869                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1870
1871                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1872
1873                 rcu_read_unlock();
1874
1875                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1876                                                ap_ht_cap_flags);
1877         }
1878
1879         if (elems.country_elem) {
1880                 /* Note we are only reviewing this on beacons
1881                  * for the BSSID we are associated to */
1882                 regulatory_hint_11d(local->hw.wiphy,
1883                         elems.country_elem, elems.country_elem_len);
1884
1885                 /* TODO: IBSS also needs this */
1886                 if (elems.pwr_constr_elem)
1887                         ieee80211_handle_pwr_constr(sdata,
1888                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1889                                 elems.pwr_constr_elem,
1890                                 elems.pwr_constr_elem_len);
1891         }
1892
1893         ieee80211_bss_info_change_notify(sdata, changed);
1894 }
1895
1896 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1897                                           struct sk_buff *skb,
1898                                           struct ieee80211_rx_status *rx_status)
1899 {
1900         struct ieee80211_local *local = sdata->local;
1901         struct ieee80211_mgmt *mgmt;
1902         u16 fc;
1903
1904         if (skb->len < 24)
1905                 return RX_DROP_MONITOR;
1906
1907         mgmt = (struct ieee80211_mgmt *) skb->data;
1908         fc = le16_to_cpu(mgmt->frame_control);
1909
1910         switch (fc & IEEE80211_FCTL_STYPE) {
1911         case IEEE80211_STYPE_PROBE_REQ:
1912         case IEEE80211_STYPE_PROBE_RESP:
1913         case IEEE80211_STYPE_BEACON:
1914                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1915         case IEEE80211_STYPE_AUTH:
1916         case IEEE80211_STYPE_ASSOC_RESP:
1917         case IEEE80211_STYPE_REASSOC_RESP:
1918         case IEEE80211_STYPE_DEAUTH:
1919         case IEEE80211_STYPE_DISASSOC:
1920                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1921                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1922                 return RX_QUEUED;
1923         }
1924
1925         return RX_DROP_MONITOR;
1926 }
1927
1928 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1929                                          struct sk_buff *skb)
1930 {
1931         struct ieee80211_rx_status *rx_status;
1932         struct ieee80211_mgmt *mgmt;
1933         u16 fc;
1934
1935         rx_status = (struct ieee80211_rx_status *) skb->cb;
1936         mgmt = (struct ieee80211_mgmt *) skb->data;
1937         fc = le16_to_cpu(mgmt->frame_control);
1938
1939         switch (fc & IEEE80211_FCTL_STYPE) {
1940         case IEEE80211_STYPE_PROBE_RESP:
1941                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1942                                              rx_status);
1943                 break;
1944         case IEEE80211_STYPE_BEACON:
1945                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1946                                          rx_status);
1947                 break;
1948         case IEEE80211_STYPE_AUTH:
1949                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1950                 break;
1951         case IEEE80211_STYPE_ASSOC_RESP:
1952                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1953                 break;
1954         case IEEE80211_STYPE_REASSOC_RESP:
1955                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1956                 break;
1957         case IEEE80211_STYPE_DEAUTH:
1958                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1959                 break;
1960         case IEEE80211_STYPE_DISASSOC:
1961                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1962                 break;
1963         }
1964
1965         kfree_skb(skb);
1966 }
1967
1968 static void ieee80211_sta_timer(unsigned long data)
1969 {
1970         struct ieee80211_sub_if_data *sdata =
1971                 (struct ieee80211_sub_if_data *) data;
1972         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1973         struct ieee80211_local *local = sdata->local;
1974
1975         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1976         queue_work(local->hw.workqueue, &ifmgd->work);
1977 }
1978
1979 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1980 {
1981         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1982         struct ieee80211_local *local = sdata->local;
1983
1984         if (local->ops->reset_tsf) {
1985                 /* Reset own TSF to allow time synchronization work. */
1986                 local->ops->reset_tsf(local_to_hw(local));
1987         }
1988
1989         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1990
1991
1992         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1993                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1994         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1995                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1996         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1997                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1998         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
1999                 ifmgd->auth_alg = WLAN_AUTH_FT;
2000         else
2001                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
2002         ifmgd->auth_transaction = -1;
2003         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
2004         ifmgd->assoc_scan_tries = 0;
2005         ifmgd->direct_probe_tries = 0;
2006         ifmgd->auth_tries = 0;
2007         ifmgd->assoc_tries = 0;
2008         netif_tx_stop_all_queues(sdata->dev);
2009         netif_carrier_off(sdata->dev);
2010 }
2011
2012 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
2013 {
2014         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2015         struct ieee80211_local *local = sdata->local;
2016         struct ieee80211_bss *bss;
2017         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
2018         u8 ssid_len = ifmgd->ssid_len;
2019         u16 capa_mask = WLAN_CAPABILITY_ESS;
2020         u16 capa_val = WLAN_CAPABILITY_ESS;
2021         struct ieee80211_channel *chan = local->oper_channel;
2022
2023         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
2024             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2025                             IEEE80211_STA_AUTO_BSSID_SEL |
2026                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2027                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2028                 if (sdata->default_key)
2029                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2030         }
2031
2032         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2033                 chan = NULL;
2034
2035         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2036                 bssid = NULL;
2037
2038         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2039                 ssid = NULL;
2040                 ssid_len = 0;
2041         }
2042
2043         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2044                                        bssid, ssid, ssid_len,
2045                                        capa_mask, capa_val);
2046
2047         if (bss) {
2048                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2049                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
2050                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2051                                                bss->ssid_len);
2052                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2053                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2054                                                     bss->supp_rates);
2055                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
2056                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
2057                 else
2058                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
2059
2060                 /* Send out direct probe if no probe resp was received or
2061                  * the one we have is outdated
2062                  */
2063                 if (!bss->last_probe_resp ||
2064                     time_after(jiffies, bss->last_probe_resp
2065                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2066                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2067                 else
2068                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2069
2070                 ieee80211_rx_bss_put(local, bss);
2071                 ieee80211_sta_reset_auth(sdata);
2072                 return 0;
2073         } else {
2074                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2075                         ifmgd->assoc_scan_tries++;
2076                         /* XXX maybe racy? */
2077                         if (local->scan_req)
2078                                 return -1;
2079                         memcpy(local->int_scan_req.ssids[0].ssid,
2080                                ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
2081                         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
2082                                 local->int_scan_req.ssids[0].ssid_len = 0;
2083                         else
2084                                 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
2085
2086                         if (ieee80211_start_scan(sdata, &local->int_scan_req))
2087                                 ieee80211_scan_failed(local);
2088
2089                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
2090                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2091                 } else {
2092                         ifmgd->assoc_scan_tries = 0;
2093                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
2094                 }
2095         }
2096         return -1;
2097 }
2098
2099
2100 static void ieee80211_sta_work(struct work_struct *work)
2101 {
2102         struct ieee80211_sub_if_data *sdata =
2103                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
2104         struct ieee80211_local *local = sdata->local;
2105         struct ieee80211_if_managed *ifmgd;
2106         struct sk_buff *skb;
2107
2108         if (!netif_running(sdata->dev))
2109                 return;
2110
2111         if (local->sw_scanning || local->hw_scanning)
2112                 return;
2113
2114         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2115                 return;
2116         ifmgd = &sdata->u.mgd;
2117
2118         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
2119                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2120
2121         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2122             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2123             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
2124             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
2125                 /*
2126                  * The call to ieee80211_start_scan can fail but ieee80211_request_scan
2127                  * (which queued ieee80211_sta_work) did not return an error. Thus, call
2128                  * ieee80211_scan_failed here if ieee80211_start_scan fails in order to
2129                  * notify the scan requester.
2130                  */
2131                 if (ieee80211_start_scan(sdata, local->scan_req))
2132                         ieee80211_scan_failed(local);
2133                 return;
2134         }
2135
2136         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
2137                 if (ieee80211_sta_config_auth(sdata))
2138                         return;
2139                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2140         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
2141                 return;
2142
2143         switch (ifmgd->state) {
2144         case IEEE80211_STA_MLME_DISABLED:
2145                 break;
2146         case IEEE80211_STA_MLME_DIRECT_PROBE:
2147                 ieee80211_direct_probe(sdata);
2148                 break;
2149         case IEEE80211_STA_MLME_AUTHENTICATE:
2150                 ieee80211_authenticate(sdata);
2151                 break;
2152         case IEEE80211_STA_MLME_ASSOCIATE:
2153                 ieee80211_associate(sdata);
2154                 break;
2155         case IEEE80211_STA_MLME_ASSOCIATED:
2156                 ieee80211_associated(sdata);
2157                 break;
2158         default:
2159                 WARN_ON(1);
2160                 break;
2161         }
2162
2163         if (ieee80211_privacy_mismatch(sdata)) {
2164                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2165                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2166
2167                 ieee80211_set_disassoc(sdata, false, true,
2168                                         WLAN_REASON_UNSPECIFIED);
2169         }
2170 }
2171
2172 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2173 {
2174         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2175                 /*
2176                  * Need to update last_beacon to avoid beacon loss
2177                  * test to trigger.
2178                  */
2179                 sdata->u.mgd.last_beacon = jiffies;
2180
2181
2182                 queue_work(sdata->local->hw.workqueue,
2183                            &sdata->u.mgd.work);
2184         }
2185 }
2186
2187 /* interface setup */
2188 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2189 {
2190         struct ieee80211_if_managed *ifmgd;
2191         u32 hw_flags;
2192
2193         ifmgd = &sdata->u.mgd;
2194         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
2195         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2196         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
2197         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2198                     (unsigned long) sdata);
2199         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2200                     (unsigned long) sdata);
2201         skb_queue_head_init(&ifmgd->skb_queue);
2202
2203         ifmgd->capab = WLAN_CAPABILITY_ESS;
2204         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2205                 IEEE80211_AUTH_ALG_SHARED_KEY;
2206         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
2207                 IEEE80211_STA_AUTO_BSSID_SEL |
2208                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2209         if (sdata->local->hw.queues >= 4)
2210                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
2211
2212         hw_flags = sdata->local->hw.flags;
2213
2214         if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
2215                 ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
2216                 sdata->local->hw.conf.dynamic_ps_timeout = 500;
2217         }
2218 }
2219
2220 /* configuration hooks */
2221 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
2222 {
2223         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2224         struct ieee80211_local *local = sdata->local;
2225
2226         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2227                 return;
2228
2229         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
2230                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2231             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
2232                              IEEE80211_STA_AUTO_SSID_SEL))) {
2233
2234                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
2235                         ieee80211_set_disassoc(sdata, true, true,
2236                                                WLAN_REASON_DEAUTH_LEAVING);
2237
2238                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
2239                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
2240                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
2241                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
2242                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
2243                 queue_work(local->hw.workqueue, &ifmgd->work);
2244         }
2245 }
2246
2247 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
2248 {
2249         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2250
2251         if (ifmgd->ssid_len)
2252                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
2253         else
2254                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
2255
2256         return 0;
2257 }
2258
2259 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2260 {
2261         struct ieee80211_if_managed *ifmgd;
2262
2263         if (len > IEEE80211_MAX_SSID_LEN)
2264                 return -EINVAL;
2265
2266         ifmgd = &sdata->u.mgd;
2267
2268         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
2269                 /*
2270                  * Do not use reassociation if SSID is changed (different ESS).
2271                  */
2272                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2273                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
2274                 memcpy(ifmgd->ssid, ssid, len);
2275                 ifmgd->ssid_len = len;
2276         }
2277
2278         return ieee80211_sta_commit(sdata);
2279 }
2280
2281 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2282 {
2283         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2284         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2285         *len = ifmgd->ssid_len;
2286         return 0;
2287 }
2288
2289 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2290 {
2291         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2292
2293         if (is_valid_ether_addr(bssid)) {
2294                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2295                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2296         } else {
2297                 memset(ifmgd->bssid, 0, ETH_ALEN);
2298                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2299         }
2300
2301         if (netif_running(sdata->dev)) {
2302                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2303                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2304                                "the low-level driver\n", sdata->dev->name);
2305                 }
2306         }
2307
2308         return ieee80211_sta_commit(sdata);
2309 }
2310
2311 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2312                                const char *ie, size_t len)
2313 {
2314         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2315
2316         kfree(ifmgd->extra_ie);
2317         if (len == 0) {
2318                 ifmgd->extra_ie = NULL;
2319                 ifmgd->extra_ie_len = 0;
2320                 return 0;
2321         }
2322         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2323         if (!ifmgd->extra_ie) {
2324                 ifmgd->extra_ie_len = 0;
2325                 return -ENOMEM;
2326         }
2327         memcpy(ifmgd->extra_ie, ie, len);
2328         ifmgd->extra_ie_len = len;
2329         return 0;
2330 }
2331
2332 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2333 {
2334         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2335                sdata->dev->name, reason);
2336
2337         ieee80211_set_disassoc(sdata, true, true, reason);
2338         return 0;
2339 }
2340
2341 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2342 {
2343         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2344
2345         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2346                sdata->dev->name, reason);
2347
2348         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2349                 return -ENOLINK;
2350
2351         ieee80211_set_disassoc(sdata, false, true, reason);
2352         return 0;
2353 }
2354
2355 /* scan finished notification */
2356 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2357 {
2358         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2359
2360         /* Restart STA timers */
2361         rcu_read_lock();
2362         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2363                 ieee80211_restart_sta_timer(sdata);
2364         rcu_read_unlock();
2365 }
2366
2367 int ieee80211_max_network_latency(struct notifier_block *nb,
2368                                   unsigned long data, void *dummy)
2369 {
2370         s32 latency_usec = (s32) data;
2371         struct ieee80211_local *local =
2372                 container_of(nb, struct ieee80211_local,
2373                              network_latency_notifier);
2374
2375         mutex_lock(&local->iflist_mtx);
2376         ieee80211_recalc_ps(local, latency_usec);
2377         mutex_unlock(&local->iflist_mtx);
2378
2379         return 0;
2380 }