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 <net/mac80211.h>
  21 #include <asm/unaligned.h>
  22
  23 #include "ieee80211_i.h"
  24 #include "rate.h"
  25 #include "led.h"
  26
  27 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  28 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  29 #define IEEE80211_AUTH_MAX_TRIES 3
  30 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  31 #define IEEE80211_ASSOC_MAX_TRIES 3
  32 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  33 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  34 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  35
  36 /* utils */
  37 static int ecw2cw(int ecw)
  38 {
  39         return (1 << ecw) - 1;
  40 }
  41
  42 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  43 {
  44         u8 *end, *pos;
  45
  46         pos = bss->cbss.information_elements;
  47         if (pos == NULL)
  48                 return NULL;
  49         end = pos + bss->cbss.len_information_elements;
  50
  51         while (pos + 1 < end) {
  52                 if (pos + 2 + pos[1] > end)
  53                         break;
  54                 if (pos[0] == ie)
  55                         return pos;
  56                 pos += 2 + pos[1];
  57         }
  58
  59         return NULL;
  60 }
  61
  62 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  63                                       struct ieee80211_supported_band *sband,
  64                                       u32 *rates)
  65 {
  66         int i, j, count;
  67         *rates = 0;
  68         count = 0;
  69         for (i = 0; i < bss->supp_rates_len; i++) {
  70                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  71
  72                 for (j = 0; j < sband->n_bitrates; j++)
  73                         if (sband->bitrates[j].bitrate == rate) {
  74                                 *rates |= BIT(j);
  75                                 count++;
  76                                 break;
  77                         }
  78         }
  79
  80         return count;
  81 }
  82
  83 /* frame sending functions */
  84
  85 static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
  86 {
  87         if (ies)
  88                 memcpy(skb_put(skb, ies_len), ies, ies_len);
  89 }
  90
  91 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
  92 {
  93         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  94         struct ieee80211_local *local = sdata->local;
  95         struct sk_buff *skb;
  96         struct ieee80211_mgmt *mgmt;
  97         u8 *pos, *ies, *ht_ie, *e_ies;
  98         int i, len, count, rates_len, supp_rates_len;
  99         u16 capab;
 100         struct ieee80211_bss *bss;
 101         int wmm = 0;
 102         struct ieee80211_supported_band *sband;
 103         u32 rates = 0;
 104         size_t e_ies_len;
 105
 106         if (ifmgd->flags & IEEE80211_IBSS_PREV_BSSID_SET) {
 107                 e_ies = sdata->u.mgd.ie_reassocreq;
 108                 e_ies_len = sdata->u.mgd.ie_reassocreq_len;
 109         } else {
 110                 e_ies = sdata->u.mgd.ie_assocreq;
 111                 e_ies_len = sdata->u.mgd.ie_assocreq_len;
 112         }
 113
 114         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 115                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
 116                             ifmgd->ssid_len + e_ies_len);
 117         if (!skb) {
 118                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 119                        "frame\n", sdata->dev->name);
 120                 return;
 121         }
 122         skb_reserve(skb, local->hw.extra_tx_headroom);
 123
 124         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 125
 126         capab = ifmgd->capab;
 127
 128         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 129                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 130                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 131                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 132                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 133         }
 134
 135         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 136                                    local->hw.conf.channel->center_freq,
 137                                    ifmgd->ssid, ifmgd->ssid_len);
 138         if (bss) {
 139                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 140                         capab |= WLAN_CAPABILITY_PRIVACY;
 141                 if (bss->wmm_used)
 142                         wmm = 1;
 143
 144                 /* get all rates supported by the device and the AP as
 145                  * some APs don't like getting a superset of their rates
 146                  * in the association request (e.g. D-Link DAP 1353 in
 147                  * b-only mode) */
 148                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 149
 150                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 151                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 152                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 153
 154                 ieee80211_rx_bss_put(local, bss);
 155         } else {
 156                 rates = ~0;
 157                 rates_len = sband->n_bitrates;
 158         }
 159
 160         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 161         memset(mgmt, 0, 24);
 162         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 163         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 164         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 165
 166         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
 167                 skb_put(skb, 10);
 168                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 169                                                   IEEE80211_STYPE_REASSOC_REQ);
 170                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 171                 mgmt->u.reassoc_req.listen_interval =
 172                                 cpu_to_le16(local->hw.conf.listen_interval);
 173                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
 174                        ETH_ALEN);
 175         } else {
 176                 skb_put(skb, 4);
 177                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 178                                                   IEEE80211_STYPE_ASSOC_REQ);
 179                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 180                 mgmt->u.assoc_req.listen_interval =
 181                                 cpu_to_le16(local->hw.conf.listen_interval);
 182         }
 183
 184         /* SSID */
 185         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
 186         *pos++ = WLAN_EID_SSID;
 187         *pos++ = ifmgd->ssid_len;
 188         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
 189
 190         /* add all rates which were marked to be used above */
 191         supp_rates_len = rates_len;
 192         if (supp_rates_len > 8)
 193                 supp_rates_len = 8;
 194
 195         len = sband->n_bitrates;
 196         pos = skb_put(skb, supp_rates_len + 2);
 197         *pos++ = WLAN_EID_SUPP_RATES;
 198         *pos++ = supp_rates_len;
 199
 200         count = 0;
 201         for (i = 0; i < sband->n_bitrates; i++) {
 202                 if (BIT(i) & rates) {
 203                         int rate = sband->bitrates[i].bitrate;
 204                         *pos++ = (u8) (rate / 5);
 205                         if (++count == 8)
 206                                 break;
 207                 }
 208         }
 209
 210         if (rates_len > count) {
 211                 pos = skb_put(skb, rates_len - count + 2);
 212                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 213                 *pos++ = rates_len - count;
 214
 215                 for (i++; i < sband->n_bitrates; i++) {
 216                         if (BIT(i) & rates) {
 217                                 int rate = sband->bitrates[i].bitrate;
 218                                 *pos++ = (u8) (rate / 5);
 219                         }
 220                 }
 221         }
 222
 223         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 224                 /* 1. power capabilities */
 225                 pos = skb_put(skb, 4);
 226                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 227                 *pos++ = 2;
 228                 *pos++ = 0; /* min tx power */
 229                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 230
 231                 /* 2. supported channels */
 232                 /* TODO: get this in reg domain format */
 233                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 234                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 235                 *pos++ = 2 * sband->n_channels;
 236                 for (i = 0; i < sband->n_channels; i++) {
 237                         *pos++ = ieee80211_frequency_to_channel(
 238                                         sband->channels[i].center_freq);
 239                         *pos++ = 1; /* one channel in the subband*/
 240                 }
 241         }
 242
 243         if (ifmgd->extra_ie) {
 244                 pos = skb_put(skb, ifmgd->extra_ie_len);
 245                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
 246         }
 247
 248         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 249                 pos = skb_put(skb, 9);
 250                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 251                 *pos++ = 7; /* len */
 252                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 253                 *pos++ = 0x50;
 254                 *pos++ = 0xf2;
 255                 *pos++ = 2; /* WME */
 256                 *pos++ = 0; /* WME info */
 257                 *pos++ = 1; /* WME ver */
 258                 *pos++ = 0;
 259         }
 260
 261         /* wmm support is a must to HT */
 262         /*
 263          * IEEE802.11n does not allow TKIP/WEP as pairwise
 264          * ciphers in HT mode. We still associate in non-ht
 265          * mode (11a/b/g) if any one of these ciphers is
 266          * configured as pairwise.
 267          */
 268         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 269             sband->ht_cap.ht_supported &&
 270             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 271             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 272             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 273                 struct ieee80211_ht_info *ht_info =
 274                         (struct ieee80211_ht_info *)(ht_ie + 2);
 275                 u16 cap = sband->ht_cap.cap;
 276                 __le16 tmp;
 277                 u32 flags = local->hw.conf.channel->flags;
 278
 279                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 280                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 281                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 282                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 283                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 284                         }
 285                         break;
 286                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 287                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 288                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 289                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 290                         }
 291                         break;
 292                 }
 293
 294                 tmp = cpu_to_le16(cap);
 295                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 296                 *pos++ = WLAN_EID_HT_CAPABILITY;
 297                 *pos++ = sizeof(struct ieee80211_ht_cap);
 298                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 299                 memcpy(pos, &tmp, sizeof(u16));
 300                 pos += sizeof(u16);
 301                 /* TODO: needs a define here for << 2 */
 302                 *pos++ = sband->ht_cap.ampdu_factor |
 303                          (sband->ht_cap.ampdu_density << 2);
 304                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 305         }
 306
 307         add_extra_ies(skb, e_ies, e_ies_len);
 308
 309         kfree(ifmgd->assocreq_ies);
 310         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
 311         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
 312         if (ifmgd->assocreq_ies)
 313                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
 314
 315         ieee80211_tx_skb(sdata, skb, 0);
 316 }
 317
 318
 319 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 320                                            u16 stype, u16 reason)
 321 {
 322         struct ieee80211_local *local = sdata->local;
 323         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 324         struct sk_buff *skb;
 325         struct ieee80211_mgmt *mgmt;
 326         u8 *ies;
 327         size_t ies_len;
 328
 329         if (stype == IEEE80211_STYPE_DEAUTH) {
 330                 ies = sdata->u.mgd.ie_deauth;
 331                 ies_len = sdata->u.mgd.ie_deauth_len;
 332         } else {
 333                 ies = sdata->u.mgd.ie_disassoc;
 334                 ies_len = sdata->u.mgd.ie_disassoc_len;
 335         }
 336
 337         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
 338                             ies_len);
 339         if (!skb) {
 340                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 341                        "deauth/disassoc frame\n", sdata->dev->name);
 342                 return;
 343         }
 344         skb_reserve(skb, local->hw.extra_tx_headroom);
 345
 346         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 347         memset(mgmt, 0, 24);
 348         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 349         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 350         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 351         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 352         skb_put(skb, 2);
 353         /* u.deauth.reason_code == u.disassoc.reason_code */
 354         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 355
 356         add_extra_ies(skb, ies, ies_len);
 357
 358         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 359 }
 360
 361 void ieee80211_send_pspoll(struct ieee80211_local *local,
 362                            struct ieee80211_sub_if_data *sdata)
 363 {
 364         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 365         struct ieee80211_pspoll *pspoll;
 366         struct sk_buff *skb;
 367         u16 fc;
 368
 369         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 370         if (!skb) {
 371                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 372                        "pspoll frame\n", sdata->dev->name);
 373                 return;
 374         }
 375         skb_reserve(skb, local->hw.extra_tx_headroom);
 376
 377         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 378         memset(pspoll, 0, sizeof(*pspoll));
 379         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 380         pspoll->frame_control = cpu_to_le16(fc);
 381         pspoll->aid = cpu_to_le16(ifmgd->aid);
 382
 383         /* aid in PS-Poll has its two MSBs each set to 1 */
 384         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 385
 386         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 387         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 388
 389         ieee80211_tx_skb(sdata, skb, 0);
 390 }
 391
 392 /* MLME */
 393 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 394                                      struct ieee80211_if_managed *ifmgd,
 395                                      u8 *wmm_param, size_t wmm_param_len)
 396 {
 397         struct ieee80211_tx_queue_params params;
 398         size_t left;
 399         int count;
 400         u8 *pos;
 401
 402         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 403                 return;
 404
 405         if (!wmm_param)
 406                 return;
 407
 408         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 409                 return;
 410         count = wmm_param[6] & 0x0f;
 411         if (count == ifmgd->wmm_last_param_set)
 412                 return;
 413         ifmgd->wmm_last_param_set = count;
 414
 415         pos = wmm_param + 8;
 416         left = wmm_param_len - 8;
 417
 418         memset(&params, 0, sizeof(params));
 419
 420         local->wmm_acm = 0;
 421         for (; left >= 4; left -= 4, pos += 4) {
 422                 int aci = (pos[0] >> 5) & 0x03;
 423                 int acm = (pos[0] >> 4) & 0x01;
 424                 int queue;
 425
 426                 switch (aci) {
 427                 case 1: /* AC_BK */
 428                         queue = 3;
 429                         if (acm)
 430                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 431                         break;
 432                 case 2: /* AC_VI */
 433                         queue = 1;
 434                         if (acm)
 435                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 436                         break;
 437                 case 3: /* AC_VO */
 438                         queue = 0;
 439                         if (acm)
 440                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 441                         break;
 442                 case 0: /* AC_BE */
 443                 default:
 444                         queue = 2;
 445                         if (acm)
 446                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 447                         break;
 448                 }
 449
 450                 params.aifs = pos[0] & 0x0f;
 451                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 452                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 453                 params.txop = get_unaligned_le16(pos + 2);
 454 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 455                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 456                        "cWmin=%d cWmax=%d txop=%d\n",
 457                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 458                        params.cw_max, params.txop);
 459 #endif
 460                 if (local->ops->conf_tx &&
 461                     local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 462                         printk(KERN_DEBUG "%s: failed to set TX queue "
 463                                "parameters for queue %d\n", local->mdev->name, queue);
 464                 }
 465         }
 466 }
 467
 468 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
 469 {
 470         u8 mask;
 471         u8 index, indexn1, indexn2;
 472         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 473
 474         aid &= 0x3fff;
 475         index = aid / 8;
 476         mask  = 1 << (aid & 7);
 477
 478         indexn1 = tim->bitmap_ctrl & 0xfe;
 479         indexn2 = elems->tim_len + indexn1 - 4;
 480
 481         if (index < indexn1 || index > indexn2)
 482                 return false;
 483
 484         index -= indexn1;
 485
 486         return !!(tim->virtual_map[index] & mask);
 487 }
 488
 489 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 490                                            u16 capab, bool erp_valid, u8 erp)
 491 {
 492         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 493 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 494         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 495 #endif
 496         u32 changed = 0;
 497         bool use_protection;
 498         bool use_short_preamble;
 499         bool use_short_slot;
 500
 501         if (erp_valid) {
 502                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 503                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 504         } else {
 505                 use_protection = false;
 506                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 507         }
 508
 509         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 510
 511         if (use_protection != bss_conf->use_cts_prot) {
 512 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 513                 if (net_ratelimit()) {
 514                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 515                                sdata->dev->name,
 516                                use_protection ? "enabled" : "disabled",
 517                                ifmgd->bssid);
 518                 }
 519 #endif
 520                 bss_conf->use_cts_prot = use_protection;
 521                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 522         }
 523
 524         if (use_short_preamble != bss_conf->use_short_preamble) {
 525 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 526                 if (net_ratelimit()) {
 527                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 528                                " (BSSID=%pM)\n",
 529                                sdata->dev->name,
 530                                use_short_preamble ? "short" : "long",
 531                                ifmgd->bssid);
 532                 }
 533 #endif
 534                 bss_conf->use_short_preamble = use_short_preamble;
 535                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 536         }
 537
 538         if (use_short_slot != bss_conf->use_short_slot) {
 539 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 540                 if (net_ratelimit()) {
 541                         printk(KERN_DEBUG "%s: switched to %s slot time"
 542                                " (BSSID=%pM)\n",
 543                                sdata->dev->name,
 544                                use_short_slot ? "short" : "long",
 545                                ifmgd->bssid);
 546                 }
 547 #endif
 548                 bss_conf->use_short_slot = use_short_slot;
 549                 changed |= BSS_CHANGED_ERP_SLOT;
 550         }
 551
 552         return changed;
 553 }
 554
 555 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 556 {
 557         union iwreq_data wrqu;
 558
 559         memset(&wrqu, 0, sizeof(wrqu));
 560         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 561                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 562         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 563         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 564 }
 565
 566 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 567 {
 568         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 569         char *buf;
 570         size_t len;
 571         int i;
 572         union iwreq_data wrqu;
 573
 574         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 575                 return;
 576
 577         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 578                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 579         if (!buf)
 580                 return;
 581
 582         len = sprintf(buf, "ASSOCINFO(");
 583         if (ifmgd->assocreq_ies) {
 584                 len += sprintf(buf + len, "ReqIEs=");
 585                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 586                         len += sprintf(buf + len, "%02x",
 587                                        ifmgd->assocreq_ies[i]);
 588                 }
 589         }
 590         if (ifmgd->assocresp_ies) {
 591                 if (ifmgd->assocreq_ies)
 592                         len += sprintf(buf + len, " ");
 593                 len += sprintf(buf + len, "RespIEs=");
 594                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 595                         len += sprintf(buf + len, "%02x",
 596                                        ifmgd->assocresp_ies[i]);
 597                 }
 598         }
 599         len += sprintf(buf + len, ")");
 600
 601         if (len > IW_CUSTOM_MAX) {
 602                 len = sprintf(buf, "ASSOCRESPIE=");
 603                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 604                         len += sprintf(buf + len, "%02x",
 605                                        ifmgd->assocresp_ies[i]);
 606                 }
 607         }
 608
 609         if (len <= IW_CUSTOM_MAX) {
 610                 memset(&wrqu, 0, sizeof(wrqu));
 611                 wrqu.data.length = len;
 612                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 613         }
 614
 615         kfree(buf);
 616 }
 617
 618
 619 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 620                                      u32 bss_info_changed)
 621 {
 622         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 623         struct ieee80211_local *local = sdata->local;
 624         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 625
 626         struct ieee80211_bss *bss;
 627
 628         bss_info_changed |= BSS_CHANGED_ASSOC;
 629         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 630
 631         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 632                                    conf->channel->center_freq,
 633                                    ifmgd->ssid, ifmgd->ssid_len);
 634         if (bss) {
 635                 /* set timing information */
 636                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 637                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 638                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 639
 640                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 641                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 642
 643                 ieee80211_rx_bss_put(local, bss);
 644         }
 645
 646         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 647         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 648         ieee80211_sta_send_associnfo(sdata);
 649
 650         ifmgd->last_probe = jiffies;
 651         ieee80211_led_assoc(local, 1);
 652
 653         sdata->vif.bss_conf.assoc = 1;
 654         /*
 655          * For now just always ask the driver to update the basic rateset
 656          * when we have associated, we aren't checking whether it actually
 657          * changed or not.
 658          */
 659         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 660         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 661
 662         if (local->powersave) {
 663                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 664                     local->hw.conf.dynamic_ps_timeout > 0) {
 665                         mod_timer(&local->dynamic_ps_timer, jiffies +
 666                                   msecs_to_jiffies(
 667                                         local->hw.conf.dynamic_ps_timeout));
 668                 } else {
 669                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 670                                 ieee80211_send_nullfunc(local, sdata, 1);
 671                         conf->flags |= IEEE80211_CONF_PS;
 672                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 673                 }
 674         }
 675
 676         netif_tx_start_all_queues(sdata->dev);
 677         netif_carrier_on(sdata->dev);
 678
 679         ieee80211_sta_send_apinfo(sdata);
 680 }
 681
 682 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 683 {
 684         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 685
 686         ifmgd->direct_probe_tries++;
 687         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 688                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 689                        sdata->dev->name, ifmgd->bssid);
 690                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 691                 ieee80211_sta_send_apinfo(sdata);
 692
 693                 /*
 694                  * Most likely AP is not in the range so remove the
 695                  * bss information associated to the AP
 696                  */
 697                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 698                                 sdata->local->hw.conf.channel->center_freq,
 699                                 ifmgd->ssid, ifmgd->ssid_len);
 700                 return;
 701         }
 702
 703         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 704                         sdata->dev->name, ifmgd->bssid,
 705                         ifmgd->direct_probe_tries);
 706
 707         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 708
 709         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
 710
 711         /* Direct probe is sent to broadcast address as some APs
 712          * will not answer to direct packet in unassociated state.
 713          */
 714         ieee80211_send_probe_req(sdata, NULL,
 715                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 716
 717         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 718 }
 719
 720
 721 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 722 {
 723         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 724
 725         ifmgd->auth_tries++;
 726         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 727                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 728                        " timed out\n",
 729                        sdata->dev->name, ifmgd->bssid);
 730                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 731                 ieee80211_sta_send_apinfo(sdata);
 732                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 733                                 sdata->local->hw.conf.channel->center_freq,
 734                                 ifmgd->ssid, ifmgd->ssid_len);
 735                 return;
 736         }
 737
 738         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 739         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 740                sdata->dev->name, ifmgd->bssid);
 741
 742         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, NULL, 0,
 743                             ifmgd->bssid, 0);
 744         ifmgd->auth_transaction = 2;
 745
 746         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 747 }
 748
 749 /*
 750  * The disassoc 'reason' argument can be either our own reason
 751  * if self disconnected or a reason code from the AP.
 752  */
 753 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 754                                    bool deauth, bool self_disconnected,
 755                                    u16 reason)
 756 {
 757         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 758         struct ieee80211_local *local = sdata->local;
 759         struct sta_info *sta;
 760         u32 changed = 0, config_changed = 0;
 761
 762         rcu_read_lock();
 763
 764         sta = sta_info_get(local, ifmgd->bssid);
 765         if (!sta) {
 766                 rcu_read_unlock();
 767                 return;
 768         }
 769
 770         if (deauth) {
 771                 ifmgd->direct_probe_tries = 0;
 772                 ifmgd->auth_tries = 0;
 773         }
 774         ifmgd->assoc_scan_tries = 0;
 775         ifmgd->assoc_tries = 0;
 776
 777         netif_tx_stop_all_queues(sdata->dev);
 778         netif_carrier_off(sdata->dev);
 779
 780         ieee80211_sta_tear_down_BA_sessions(sta);
 781
 782         if (self_disconnected) {
 783                 if (deauth)
 784                         ieee80211_send_deauth_disassoc(sdata,
 785                                 IEEE80211_STYPE_DEAUTH, reason);
 786                 else
 787                         ieee80211_send_deauth_disassoc(sdata,
 788                                 IEEE80211_STYPE_DISASSOC, reason);
 789         }
 790
 791         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
 792         changed |= ieee80211_reset_erp_info(sdata);
 793
 794         ieee80211_led_assoc(local, 0);
 795         changed |= BSS_CHANGED_ASSOC;
 796         sdata->vif.bss_conf.assoc = false;
 797
 798         ieee80211_sta_send_apinfo(sdata);
 799
 800         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 801                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 802                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 803                                 sdata->local->hw.conf.channel->center_freq,
 804                                 ifmgd->ssid, ifmgd->ssid_len);
 805         }
 806
 807         rcu_read_unlock();
 808
 809         /* channel(_type) changes are handled by ieee80211_hw_config */
 810         local->oper_channel_type = NL80211_CHAN_NO_HT;
 811
 812         local->power_constr_level = 0;
 813
 814         del_timer_sync(&local->dynamic_ps_timer);
 815         cancel_work_sync(&local->dynamic_ps_enable_work);
 816
 817         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 818                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 819                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 820         }
 821
 822         ieee80211_hw_config(local, config_changed);
 823         ieee80211_bss_info_change_notify(sdata, changed);
 824
 825         rcu_read_lock();
 826
 827         sta = sta_info_get(local, ifmgd->bssid);
 828         if (!sta) {
 829                 rcu_read_unlock();
 830                 return;
 831         }
 832
 833         sta_info_unlink(&sta);
 834
 835         rcu_read_unlock();
 836
 837         sta_info_destroy(sta);
 838 }
 839
 840 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 841 {
 842         if (!sdata || !sdata->default_key ||
 843             sdata->default_key->conf.alg != ALG_WEP)
 844                 return 0;
 845         return 1;
 846 }
 847
 848 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
 849 {
 850         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 851         struct ieee80211_local *local = sdata->local;
 852         struct ieee80211_bss *bss;
 853         int bss_privacy;
 854         int wep_privacy;
 855         int privacy_invoked;
 856
 857         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_MIXED_CELL))
 858                 return 0;
 859
 860         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 861                                    local->hw.conf.channel->center_freq,
 862                                    ifmgd->ssid, ifmgd->ssid_len);
 863         if (!bss)
 864                 return 0;
 865
 866         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
 867         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 868         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
 869
 870         ieee80211_rx_bss_put(local, bss);
 871
 872         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 873                 return 0;
 874
 875         return 1;
 876 }
 877
 878 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
 879 {
 880         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 881
 882         ifmgd->assoc_tries++;
 883         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 884                 printk(KERN_DEBUG "%s: association with AP %pM"
 885                        " timed out\n",
 886                        sdata->dev->name, ifmgd->bssid);
 887                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 888                 ieee80211_sta_send_apinfo(sdata);
 889                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 890                                 sdata->local->hw.conf.channel->center_freq,
 891                                 ifmgd->ssid, ifmgd->ssid_len);
 892                 return;
 893         }
 894
 895         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
 896         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 897                sdata->dev->name, ifmgd->bssid);
 898         if (ieee80211_privacy_mismatch(sdata)) {
 899                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 900                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 901                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 902                 return;
 903         }
 904
 905         ieee80211_send_assoc(sdata);
 906
 907         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 908 }
 909
 910
 911 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
 912 {
 913         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 914         struct ieee80211_local *local = sdata->local;
 915         struct sta_info *sta;
 916         int disassoc;
 917
 918         /* TODO: start monitoring current AP signal quality and number of
 919          * missed beacons. Scan other channels every now and then and search
 920          * for better APs. */
 921         /* TODO: remove expired BSSes */
 922
 923         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
 924
 925         rcu_read_lock();
 926
 927         sta = sta_info_get(local, ifmgd->bssid);
 928         if (!sta) {
 929                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
 930                        sdata->dev->name, ifmgd->bssid);
 931                 disassoc = 1;
 932         } else {
 933                 disassoc = 0;
 934                 if (time_after(jiffies,
 935                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 936                         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
 937                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 938                                        "current AP %pM - assume out of "
 939                                        "range\n",
 940                                        sdata->dev->name, ifmgd->bssid);
 941                                 disassoc = 1;
 942                         } else
 943                                 ieee80211_send_probe_req(sdata, ifmgd->bssid,
 944                                                          ifmgd->ssid,
 945                                                          ifmgd->ssid_len,
 946                                                          NULL, 0);
 947                         ifmgd->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 948                 } else {
 949                         ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 950                         if (time_after(jiffies, ifmgd->last_probe +
 951                                        IEEE80211_PROBE_INTERVAL)) {
 952                                 ifmgd->last_probe = jiffies;
 953                                 ieee80211_send_probe_req(sdata, ifmgd->bssid,
 954                                                          ifmgd->ssid,
 955                                                          ifmgd->ssid_len,
 956                                                          NULL, 0);
 957                         }
 958                 }
 959         }
 960
 961         rcu_read_unlock();
 962
 963         if (disassoc)
 964                 ieee80211_set_disassoc(sdata, true, true,
 965                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
 966         else
 967                 mod_timer(&ifmgd->timer, jiffies +
 968                                       IEEE80211_MONITORING_INTERVAL);
 969 }
 970
 971
 972 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
 973 {
 974         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 975
 976         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
 977         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
 978         ieee80211_associate(sdata);
 979 }
 980
 981
 982 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
 983                                      struct ieee80211_mgmt *mgmt,
 984                                      size_t len)
 985 {
 986         u8 *pos;
 987         struct ieee802_11_elems elems;
 988
 989         pos = mgmt->u.auth.variable;
 990         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 991         if (!elems.challenge)
 992                 return;
 993         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
 994                             elems.challenge - 2, elems.challenge_len + 2,
 995                             sdata->u.mgd.bssid, 1);
 996         sdata->u.mgd.auth_transaction = 4;
 997 }
 998
 999 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1000                                    struct ieee80211_mgmt *mgmt,
1001                                    size_t len)
1002 {
1003         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1004         u16 auth_alg, auth_transaction, status_code;
1005
1006         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1007                 return;
1008
1009         if (len < 24 + 6)
1010                 return;
1011
1012         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1013                 return;
1014
1015         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1016                 return;
1017
1018         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1019         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1020         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1021
1022         if (auth_alg != ifmgd->auth_alg ||
1023             auth_transaction != ifmgd->auth_transaction)
1024                 return;
1025
1026         if (status_code != WLAN_STATUS_SUCCESS) {
1027                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1028                         u8 algs[3];
1029                         const int num_algs = ARRAY_SIZE(algs);
1030                         int i, pos;
1031                         algs[0] = algs[1] = algs[2] = 0xff;
1032                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1033                                 algs[0] = WLAN_AUTH_OPEN;
1034                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1035                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1036                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1037                                 algs[2] = WLAN_AUTH_LEAP;
1038                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1039                                 pos = 0;
1040                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1041                                 pos = 1;
1042                         else
1043                                 pos = 2;
1044                         for (i = 0; i < num_algs; i++) {
1045                                 pos++;
1046                                 if (pos >= num_algs)
1047                                         pos = 0;
1048                                 if (algs[pos] == ifmgd->auth_alg ||
1049                                     algs[pos] == 0xff)
1050                                         continue;
1051                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1052                                     !ieee80211_sta_wep_configured(sdata))
1053                                         continue;
1054                                 ifmgd->auth_alg = algs[pos];
1055                                 break;
1056                         }
1057                 }
1058                 return;
1059         }
1060
1061         switch (ifmgd->auth_alg) {
1062         case WLAN_AUTH_OPEN:
1063         case WLAN_AUTH_LEAP:
1064                 ieee80211_auth_completed(sdata);
1065                 break;
1066         case WLAN_AUTH_SHARED_KEY:
1067                 if (ifmgd->auth_transaction == 4)
1068                         ieee80211_auth_completed(sdata);
1069                 else
1070                         ieee80211_auth_challenge(sdata, mgmt, len);
1071                 break;
1072         }
1073 }
1074
1075
1076 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1077                                      struct ieee80211_mgmt *mgmt,
1078                                      size_t len)
1079 {
1080         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1081         u16 reason_code;
1082
1083         if (len < 24 + 2)
1084                 return;
1085
1086         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1087                 return;
1088
1089         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1090
1091         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1092                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1093                                 sdata->dev->name, reason_code);
1094
1095         if (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1096             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1097             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1098                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1099                 mod_timer(&ifmgd->timer, jiffies +
1100                                       IEEE80211_RETRY_AUTH_INTERVAL);
1101         }
1102
1103         ieee80211_set_disassoc(sdata, true, false, 0);
1104         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1105 }
1106
1107
1108 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1109                                        struct ieee80211_mgmt *mgmt,
1110                                        size_t len)
1111 {
1112         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1113         u16 reason_code;
1114
1115         if (len < 24 + 2)
1116                 return;
1117
1118         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1119                 return;
1120
1121         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1122
1123         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1124                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1125                                 sdata->dev->name, reason_code);
1126
1127         if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1128                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1129                 mod_timer(&ifmgd->timer, jiffies +
1130                                       IEEE80211_RETRY_AUTH_INTERVAL);
1131         }
1132
1133         ieee80211_set_disassoc(sdata, false, false, reason_code);
1134 }
1135
1136
1137 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1138                                          struct ieee80211_mgmt *mgmt,
1139                                          size_t len,
1140                                          int reassoc)
1141 {
1142         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1143         struct ieee80211_local *local = sdata->local;
1144         struct ieee80211_supported_band *sband;
1145         struct sta_info *sta;
1146         u32 rates, basic_rates;
1147         u16 capab_info, status_code, aid;
1148         struct ieee802_11_elems elems;
1149         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1150         u8 *pos;
1151         u32 changed = 0;
1152         int i, j;
1153         bool have_higher_than_11mbit = false, newsta = false;
1154         u16 ap_ht_cap_flags;
1155
1156         /* AssocResp and ReassocResp have identical structure, so process both
1157          * of them in this function. */
1158
1159         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1160                 return;
1161
1162         if (len < 24 + 6)
1163                 return;
1164
1165         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1166                 return;
1167
1168         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1169         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1170         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1171
1172         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1173                "status=%d aid=%d)\n",
1174                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1175                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1176
1177         pos = mgmt->u.assoc_resp.variable;
1178         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1179
1180         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1181             elems.timeout_int && elems.timeout_int_len == 5 &&
1182             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1183                 u32 tu, ms;
1184                 tu = get_unaligned_le32(elems.timeout_int + 1);
1185                 ms = tu * 1024 / 1000;
1186                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1187                        "comeback duration %u TU (%u ms)\n",
1188                        sdata->dev->name, tu, ms);
1189                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1190                         mod_timer(&ifmgd->timer,
1191                                   jiffies + msecs_to_jiffies(ms));
1192                 return;
1193         }
1194
1195         if (status_code != WLAN_STATUS_SUCCESS) {
1196                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1197                        sdata->dev->name, status_code);
1198                 /* if this was a reassociation, ensure we try a "full"
1199                  * association next time. This works around some broken APs
1200                  * which do not correctly reject reassociation requests. */
1201                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1202                 return;
1203         }
1204
1205         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1206                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1207                        "set\n", sdata->dev->name, aid);
1208         aid &= ~(BIT(15) | BIT(14));
1209
1210         if (!elems.supp_rates) {
1211                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1212                        sdata->dev->name);
1213                 return;
1214         }
1215
1216         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1217         ifmgd->aid = aid;
1218         ifmgd->ap_capab = capab_info;
1219
1220         kfree(ifmgd->assocresp_ies);
1221         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1222         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1223         if (ifmgd->assocresp_ies)
1224                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1225
1226         rcu_read_lock();
1227
1228         /* Add STA entry for the AP */
1229         sta = sta_info_get(local, ifmgd->bssid);
1230         if (!sta) {
1231                 newsta = true;
1232
1233                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1234                 if (!sta) {
1235                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1236                                " the AP\n", sdata->dev->name);
1237                         rcu_read_unlock();
1238                         return;
1239                 }
1240
1241                 /* update new sta with its last rx activity */
1242                 sta->last_rx = jiffies;
1243         }
1244
1245         /*
1246          * FIXME: Do we really need to update the sta_info's information here?
1247          *        We already know about the AP (we found it in our list) so it
1248          *        should already be filled with the right info, no?
1249          *        As is stands, all this is racy because typically we assume
1250          *        the information that is filled in here (except flags) doesn't
1251          *        change while a STA structure is alive. As such, it should move
1252          *        to between the sta_info_alloc() and sta_info_insert() above.
1253          */
1254
1255         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1256                            WLAN_STA_AUTHORIZED);
1257
1258         rates = 0;
1259         basic_rates = 0;
1260         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1261
1262         for (i = 0; i < elems.supp_rates_len; i++) {
1263                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1264                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1265
1266                 if (rate > 110)
1267                         have_higher_than_11mbit = true;
1268
1269                 for (j = 0; j < sband->n_bitrates; j++) {
1270                         if (sband->bitrates[j].bitrate == rate) {
1271                                 rates |= BIT(j);
1272                                 if (is_basic)
1273                                         basic_rates |= BIT(j);
1274                                 break;
1275                         }
1276                 }
1277         }
1278
1279         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1280                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1281                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1282
1283                 if (rate > 110)
1284                         have_higher_than_11mbit = true;
1285
1286                 for (j = 0; j < sband->n_bitrates; j++) {
1287                         if (sband->bitrates[j].bitrate == rate) {
1288                                 rates |= BIT(j);
1289                                 if (is_basic)
1290                                         basic_rates |= BIT(j);
1291                                 break;
1292                         }
1293                 }
1294         }
1295
1296         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1297         sdata->vif.bss_conf.basic_rates = basic_rates;
1298
1299         /* cf. IEEE 802.11 9.2.12 */
1300         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1301             have_higher_than_11mbit)
1302                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1303         else
1304                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1305
1306         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1307         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1308                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1309                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1310
1311         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1312
1313         rate_control_rate_init(sta);
1314
1315         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1316                 set_sta_flags(sta, WLAN_STA_MFP);
1317
1318         if (elems.wmm_param)
1319                 set_sta_flags(sta, WLAN_STA_WME);
1320
1321         if (newsta) {
1322                 int err = sta_info_insert(sta);
1323                 if (err) {
1324                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1325                                " the AP (error %d)\n", sdata->dev->name, err);
1326                         rcu_read_unlock();
1327                         return;
1328                 }
1329         }
1330
1331         rcu_read_unlock();
1332
1333         if (elems.wmm_param)
1334                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1335                                          elems.wmm_param_len);
1336
1337         if (elems.ht_info_elem && elems.wmm_param &&
1338             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1339             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1340                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1341                                                ap_ht_cap_flags);
1342
1343         /* set AID and assoc capability,
1344          * ieee80211_set_associated() will tell the driver */
1345         bss_conf->aid = aid;
1346         bss_conf->assoc_capability = capab_info;
1347         ieee80211_set_associated(sdata, changed);
1348
1349         ieee80211_associated(sdata);
1350 }
1351
1352
1353 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1354                                   struct ieee80211_mgmt *mgmt,
1355                                   size_t len,
1356                                   struct ieee80211_rx_status *rx_status,
1357                                   struct ieee802_11_elems *elems,
1358                                   bool beacon)
1359 {
1360         struct ieee80211_local *local = sdata->local;
1361         int freq;
1362         struct ieee80211_bss *bss;
1363         struct ieee80211_channel *channel;
1364
1365         if (elems->ds_params && elems->ds_params_len == 1)
1366                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1367         else
1368                 freq = rx_status->freq;
1369
1370         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1371
1372         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1373                 return;
1374
1375         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1376                                         channel, beacon);
1377         if (!bss)
1378                 return;
1379
1380         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1381             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1382                 struct ieee80211_channel_sw_ie *sw_elem =
1383                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1384                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1385         }
1386
1387         ieee80211_rx_bss_put(local, bss);
1388 }
1389
1390
1391 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1392                                          struct ieee80211_mgmt *mgmt,
1393                                          size_t len,
1394                                          struct ieee80211_rx_status *rx_status)
1395 {
1396         size_t baselen;
1397         struct ieee802_11_elems elems;
1398
1399         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1400                 return; /* ignore ProbeResp to foreign address */
1401
1402         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1403         if (baselen > len)
1404                 return;
1405
1406         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1407                                 &elems);
1408
1409         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1410
1411         /* direct probe may be part of the association flow */
1412         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1413             &sdata->u.mgd.request)) {
1414                 printk(KERN_DEBUG "%s direct probe responded\n",
1415                        sdata->dev->name);
1416                 ieee80211_authenticate(sdata);
1417         }
1418 }
1419
1420 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1421                                      struct ieee80211_mgmt *mgmt,
1422                                      size_t len,
1423                                      struct ieee80211_rx_status *rx_status)
1424 {
1425         struct ieee80211_if_managed *ifmgd;
1426         size_t baselen;
1427         struct ieee802_11_elems elems;
1428         struct ieee80211_local *local = sdata->local;
1429         u32 changed = 0;
1430         bool erp_valid, directed_tim;
1431         u8 erp_value = 0;
1432
1433         /* Process beacon from the current BSS */
1434         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1435         if (baselen > len)
1436                 return;
1437
1438         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1439
1440         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1441
1442         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1443                 return;
1444
1445         ifmgd = &sdata->u.mgd;
1446
1447         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1448             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1449                 return;
1450
1451         if (rx_status->freq != local->hw.conf.channel->center_freq)
1452                 return;
1453
1454         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1455                                  elems.wmm_param_len);
1456
1457         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1458                 directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
1459
1460                 if (directed_tim) {
1461                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1462                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1463                                 ieee80211_hw_config(local,
1464                                                     IEEE80211_CONF_CHANGE_PS);
1465                                 ieee80211_send_nullfunc(local, sdata, 0);
1466                         } else {
1467                                 local->pspolling = true;
1468
1469                                 /*
1470                                  * Here is assumed that the driver will be
1471                                  * able to send ps-poll frame and receive a
1472                                  * response even though power save mode is
1473                                  * enabled, but some drivers might require
1474                                  * to disable power save here. This needs
1475                                  * to be investigated.
1476                                  */
1477                                 ieee80211_send_pspoll(local, sdata);
1478                         }
1479                 }
1480         }
1481
1482         if (elems.erp_info && elems.erp_info_len >= 1) {
1483                 erp_valid = true;
1484                 erp_value = elems.erp_info[0];
1485         } else {
1486                 erp_valid = false;
1487         }
1488         changed |= ieee80211_handle_bss_capability(sdata,
1489                         le16_to_cpu(mgmt->u.beacon.capab_info),
1490                         erp_valid, erp_value);
1491
1492
1493         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1494             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1495                 struct sta_info *sta;
1496                 struct ieee80211_supported_band *sband;
1497                 u16 ap_ht_cap_flags;
1498
1499                 rcu_read_lock();
1500
1501                 sta = sta_info_get(local, ifmgd->bssid);
1502                 if (!sta) {
1503                         rcu_read_unlock();
1504                         return;
1505                 }
1506
1507                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1508
1509                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1510                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1511
1512                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1513
1514                 rcu_read_unlock();
1515
1516                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1517                                                ap_ht_cap_flags);
1518         }
1519
1520         if (elems.country_elem) {
1521                 /* Note we are only reviewing this on beacons
1522                  * for the BSSID we are associated to */
1523                 regulatory_hint_11d(local->hw.wiphy,
1524                         elems.country_elem, elems.country_elem_len);
1525
1526                 /* TODO: IBSS also needs this */
1527                 if (elems.pwr_constr_elem)
1528                         ieee80211_handle_pwr_constr(sdata,
1529                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1530                                 elems.pwr_constr_elem,
1531                                 elems.pwr_constr_elem_len);
1532         }
1533
1534         ieee80211_bss_info_change_notify(sdata, changed);
1535 }
1536
1537 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1538                                           struct sk_buff *skb,
1539                                           struct ieee80211_rx_status *rx_status)
1540 {
1541         struct ieee80211_local *local = sdata->local;
1542         struct ieee80211_mgmt *mgmt;
1543         u16 fc;
1544
1545         if (skb->len < 24)
1546                 return RX_DROP_MONITOR;
1547
1548         mgmt = (struct ieee80211_mgmt *) skb->data;
1549         fc = le16_to_cpu(mgmt->frame_control);
1550
1551         switch (fc & IEEE80211_FCTL_STYPE) {
1552         case IEEE80211_STYPE_PROBE_REQ:
1553         case IEEE80211_STYPE_PROBE_RESP:
1554         case IEEE80211_STYPE_BEACON:
1555                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1556         case IEEE80211_STYPE_AUTH:
1557         case IEEE80211_STYPE_ASSOC_RESP:
1558         case IEEE80211_STYPE_REASSOC_RESP:
1559         case IEEE80211_STYPE_DEAUTH:
1560         case IEEE80211_STYPE_DISASSOC:
1561                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1562                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1563                 return RX_QUEUED;
1564         }
1565
1566         return RX_DROP_MONITOR;
1567 }
1568
1569 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1570                                          struct sk_buff *skb)
1571 {
1572         struct ieee80211_rx_status *rx_status;
1573         struct ieee80211_mgmt *mgmt;
1574         u16 fc;
1575
1576         rx_status = (struct ieee80211_rx_status *) skb->cb;
1577         mgmt = (struct ieee80211_mgmt *) skb->data;
1578         fc = le16_to_cpu(mgmt->frame_control);
1579
1580         switch (fc & IEEE80211_FCTL_STYPE) {
1581         case IEEE80211_STYPE_PROBE_RESP:
1582                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1583                                              rx_status);
1584                 break;
1585         case IEEE80211_STYPE_BEACON:
1586                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1587                                          rx_status);
1588                 break;
1589         case IEEE80211_STYPE_AUTH:
1590                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1591                 break;
1592         case IEEE80211_STYPE_ASSOC_RESP:
1593                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1594                 break;
1595         case IEEE80211_STYPE_REASSOC_RESP:
1596                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1597                 break;
1598         case IEEE80211_STYPE_DEAUTH:
1599                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1600                 break;
1601         case IEEE80211_STYPE_DISASSOC:
1602                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1603                 break;
1604         }
1605
1606         kfree_skb(skb);
1607 }
1608
1609 static void ieee80211_sta_timer(unsigned long data)
1610 {
1611         struct ieee80211_sub_if_data *sdata =
1612                 (struct ieee80211_sub_if_data *) data;
1613         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1614         struct ieee80211_local *local = sdata->local;
1615
1616         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1617         queue_work(local->hw.workqueue, &ifmgd->work);
1618 }
1619
1620 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1621 {
1622         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1623         struct ieee80211_local *local = sdata->local;
1624
1625         if (local->ops->reset_tsf) {
1626                 /* Reset own TSF to allow time synchronization work. */
1627                 local->ops->reset_tsf(local_to_hw(local));
1628         }
1629
1630         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1631
1632
1633         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1634                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1635         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1636                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1637         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1638                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1639         else
1640                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1641         ifmgd->auth_transaction = -1;
1642         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1643         ifmgd->assoc_scan_tries = 0;
1644         ifmgd->direct_probe_tries = 0;
1645         ifmgd->auth_tries = 0;
1646         ifmgd->assoc_tries = 0;
1647         netif_tx_stop_all_queues(sdata->dev);
1648         netif_carrier_off(sdata->dev);
1649 }
1650
1651 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
1652 {
1653         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1654         struct ieee80211_local *local = sdata->local;
1655         struct ieee80211_bss *bss;
1656         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
1657         u8 ssid_len = ifmgd->ssid_len;
1658         u16 capa_mask = WLAN_CAPABILITY_ESS;
1659         u16 capa_val = WLAN_CAPABILITY_ESS;
1660         struct ieee80211_channel *chan = local->oper_channel;
1661
1662         if (ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
1663                             IEEE80211_STA_AUTO_BSSID_SEL |
1664                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
1665                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
1666                 if (sdata->default_key)
1667                         capa_val |= WLAN_CAPABILITY_PRIVACY;
1668         }
1669
1670         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
1671                 chan = NULL;
1672
1673         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1674                 bssid = NULL;
1675
1676         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
1677                 ssid = NULL;
1678                 ssid_len = 0;
1679         }
1680
1681         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
1682                                        bssid, ssid, ssid_len,
1683                                        capa_mask, capa_val);
1684
1685         if (bss) {
1686                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
1687                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
1688                         ieee80211_sta_set_ssid(sdata, bss->ssid,
1689                                                bss->ssid_len);
1690                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
1691                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
1692                                                     bss->supp_rates);
1693                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
1694                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
1695                 else
1696                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
1697
1698                 /* Send out direct probe if no probe resp was received or
1699                  * the one we have is outdated
1700                  */
1701                 if (!bss->last_probe_resp ||
1702                     time_after(jiffies, bss->last_probe_resp
1703                                         + IEEE80211_SCAN_RESULT_EXPIRE))
1704                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1705                 else
1706                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1707
1708                 ieee80211_rx_bss_put(local, bss);
1709                 ieee80211_sta_reset_auth(sdata);
1710                 return 0;
1711         } else {
1712                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
1713                         ifmgd->assoc_scan_tries++;
1714                         /* XXX maybe racy? */
1715                         if (local->scan_req)
1716                                 return -1;
1717                         memcpy(local->int_scan_req.ssids[0].ssid,
1718                                ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
1719                         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
1720                                 local->int_scan_req.ssids[0].ssid_len = 0;
1721                         else
1722                                 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
1723
1724                         if (ieee80211_start_scan(sdata, &local->int_scan_req))
1725                                 ieee80211_scan_failed(local);
1726
1727                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1728                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1729                 } else {
1730                         ifmgd->assoc_scan_tries = 0;
1731                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1732                 }
1733         }
1734         return -1;
1735 }
1736
1737
1738 static void ieee80211_sta_work(struct work_struct *work)
1739 {
1740         struct ieee80211_sub_if_data *sdata =
1741                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1742         struct ieee80211_local *local = sdata->local;
1743         struct ieee80211_if_managed *ifmgd;
1744         struct sk_buff *skb;
1745
1746         if (!netif_running(sdata->dev))
1747                 return;
1748
1749         if (local->sw_scanning || local->hw_scanning)
1750                 return;
1751
1752         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1753                 return;
1754         ifmgd = &sdata->u.mgd;
1755
1756         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1757                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1758
1759         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
1760             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1761             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
1762             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
1763                 /*
1764                  * The call to ieee80211_start_scan can fail but ieee80211_request_scan
1765                  * (which queued ieee80211_sta_work) did not return an error. Thus, call
1766                  * ieee80211_scan_failed here if ieee80211_start_scan fails in order to
1767                  * notify the scan requester.
1768                  */
1769                 if (ieee80211_start_scan(sdata, local->scan_req))
1770                         ieee80211_scan_failed(local);
1771                 return;
1772         }
1773
1774         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
1775                 if (ieee80211_sta_config_auth(sdata))
1776                         return;
1777                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1778         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
1779                 return;
1780
1781         switch (ifmgd->state) {
1782         case IEEE80211_STA_MLME_DISABLED:
1783                 break;
1784         case IEEE80211_STA_MLME_DIRECT_PROBE:
1785                 ieee80211_direct_probe(sdata);
1786                 break;
1787         case IEEE80211_STA_MLME_AUTHENTICATE:
1788                 ieee80211_authenticate(sdata);
1789                 break;
1790         case IEEE80211_STA_MLME_ASSOCIATE:
1791                 ieee80211_associate(sdata);
1792                 break;
1793         case IEEE80211_STA_MLME_ASSOCIATED:
1794                 ieee80211_associated(sdata);
1795                 break;
1796         default:
1797                 WARN_ON(1);
1798                 break;
1799         }
1800
1801         if (ieee80211_privacy_mismatch(sdata)) {
1802                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
1803                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
1804
1805                 ieee80211_set_disassoc(sdata, false, true,
1806                                         WLAN_REASON_UNSPECIFIED);
1807         }
1808 }
1809
1810 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1811 {
1812         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1813                 queue_work(sdata->local->hw.workqueue,
1814                            &sdata->u.mgd.work);
1815 }
1816
1817 /* interface setup */
1818 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1819 {
1820         struct ieee80211_if_managed *ifmgd;
1821
1822         ifmgd = &sdata->u.mgd;
1823         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1824         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1825         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1826                     (unsigned long) sdata);
1827         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1828                     (unsigned long) sdata);
1829         skb_queue_head_init(&ifmgd->skb_queue);
1830
1831         ifmgd->capab = WLAN_CAPABILITY_ESS;
1832         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
1833                 IEEE80211_AUTH_ALG_SHARED_KEY;
1834         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
1835                 IEEE80211_STA_AUTO_BSSID_SEL |
1836                 IEEE80211_STA_AUTO_CHANNEL_SEL;
1837         if (sdata->local->hw.queues >= 4)
1838                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
1839 }
1840
1841 /* configuration hooks */
1842 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
1843 {
1844         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1845         struct ieee80211_local *local = sdata->local;
1846
1847         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1848                 return;
1849
1850         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
1851                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
1852             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
1853                              IEEE80211_STA_AUTO_SSID_SEL))) {
1854
1855                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
1856                         ieee80211_set_disassoc(sdata, true, true,
1857                                                WLAN_REASON_DEAUTH_LEAVING);
1858
1859                 set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1860                 queue_work(local->hw.workqueue, &ifmgd->work);
1861         }
1862 }
1863
1864 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
1865 {
1866         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1867
1868         ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1869
1870         if (ifmgd->ssid_len)
1871                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
1872         else
1873                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
1874
1875         return 0;
1876 }
1877
1878 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
1879 {
1880         struct ieee80211_if_managed *ifmgd;
1881
1882         if (len > IEEE80211_MAX_SSID_LEN)
1883                 return -EINVAL;
1884
1885         ifmgd = &sdata->u.mgd;
1886
1887         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
1888                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
1889                 memcpy(ifmgd->ssid, ssid, len);
1890                 ifmgd->ssid_len = len;
1891         }
1892
1893         return ieee80211_sta_commit(sdata);
1894 }
1895
1896 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
1897 {
1898         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1899         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
1900         *len = ifmgd->ssid_len;
1901         return 0;
1902 }
1903
1904 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
1905 {
1906         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1907
1908         if (is_valid_ether_addr(bssid)) {
1909                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
1910                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
1911         } else {
1912                 memset(ifmgd->bssid, 0, ETH_ALEN);
1913                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
1914         }
1915
1916         if (netif_running(sdata->dev)) {
1917                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
1918                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
1919                                "the low-level driver\n", sdata->dev->name);
1920                 }
1921         }
1922
1923         return ieee80211_sta_commit(sdata);
1924 }
1925
1926 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
1927 {
1928         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1929
1930         kfree(ifmgd->extra_ie);
1931         if (len == 0) {
1932                 ifmgd->extra_ie = NULL;
1933                 ifmgd->extra_ie_len = 0;
1934                 return 0;
1935         }
1936         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
1937         if (!ifmgd->extra_ie) {
1938                 ifmgd->extra_ie_len = 0;
1939                 return -ENOMEM;
1940         }
1941         memcpy(ifmgd->extra_ie, ie, len);
1942         ifmgd->extra_ie_len = len;
1943         return 0;
1944 }
1945
1946 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
1947 {
1948         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
1949                sdata->dev->name, reason);
1950
1951         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1952                 return -EINVAL;
1953
1954         ieee80211_set_disassoc(sdata, true, true, reason);
1955         return 0;
1956 }
1957
1958 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
1959 {
1960         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1961
1962         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
1963                sdata->dev->name, reason);
1964
1965         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1966                 return -EINVAL;
1967
1968         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
1969                 return -ENOLINK;
1970
1971         ieee80211_set_disassoc(sdata, false, true, reason);
1972         return 0;
1973 }
1974
1975 /* scan finished notification */
1976 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1977 {
1978         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1979
1980         /* Restart STA timers */
1981         rcu_read_lock();
1982         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1983                 ieee80211_restart_sta_timer(sdata);
1984         rcu_read_unlock();
1985 }
1986
1987 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1988 {
1989         struct ieee80211_local *local =
1990                 container_of(work, struct ieee80211_local,
1991                              dynamic_ps_disable_work);
1992
1993         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1994                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1995                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1996         }
1997
1998         ieee80211_wake_queues_by_reason(&local->hw,
1999                                         IEEE80211_QUEUE_STOP_REASON_PS);
2000 }
2001
2002 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2003 {
2004         struct ieee80211_local *local =
2005                 container_of(work, struct ieee80211_local,
2006                              dynamic_ps_enable_work);
2007         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2008
2009         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2010                 return;
2011
2012         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2013                 ieee80211_send_nullfunc(local, sdata, 1);
2014
2015         local->hw.conf.flags |= IEEE80211_CONF_PS;
2016         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2017 }
2018
2019 void ieee80211_dynamic_ps_timer(unsigned long data)
2020 {
2021         struct ieee80211_local *local = (void *) data;
2022
2023         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2024 }
2025
2026 void ieee80211_send_nullfunc(struct ieee80211_local *local,
2027                              struct ieee80211_sub_if_data *sdata,
2028                              int powersave)
2029 {
2030         struct sk_buff *skb;
2031         struct ieee80211_hdr *nullfunc;
2032         __le16 fc;
2033
2034         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2035                 return;
2036
2037         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2038         if (!skb) {
2039                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2040                        "frame\n", sdata->dev->name);
2041                 return;
2042         }
2043         skb_reserve(skb, local->hw.extra_tx_headroom);
2044
2045         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2046         memset(nullfunc, 0, 24);
2047         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2048                          IEEE80211_FCTL_TODS);
2049         if (powersave)
2050                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
2051         nullfunc->frame_control = fc;
2052         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2053         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2054         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2055
2056         ieee80211_tx_skb(sdata, skb, 0);
2057 }