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/wireless.h>
  19 #include <linux/random.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/rtnetlink.h>
  22 #include <net/iw_handler.h>
  23 #include <net/mac80211.h>
  24 #include <asm/unaligned.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  32 #define IEEE80211_AUTH_MAX_TRIES 3
  33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  34 #define IEEE80211_ASSOC_MAX_TRIES 3
  35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  36 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  38 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  41
  42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  44
  45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  46
  47
  48 /* utils */
  49 static int ecw2cw(int ecw)
  50 {
  51         return (1 << ecw) - 1;
  52 }
  53
  54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  55 {
  56         u8 *end, *pos;
  57
  58         pos = bss->cbss.information_elements;
  59         if (pos == NULL)
  60                 return NULL;
  61         end = pos + bss->cbss.len_information_elements;
  62
  63         while (pos + 1 < end) {
  64                 if (pos + 2 + pos[1] > end)
  65                         break;
  66                 if (pos[0] == ie)
  67                         return pos;
  68                 pos += 2 + pos[1];
  69         }
  70
  71         return NULL;
  72 }
  73
  74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  75                                       struct ieee80211_supported_band *sband,
  76                                       u32 *rates)
  77 {
  78         int i, j, count;
  79         *rates = 0;
  80         count = 0;
  81         for (i = 0; i < bss->supp_rates_len; i++) {
  82                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  83
  84                 for (j = 0; j < sband->n_bitrates; j++)
  85                         if (sband->bitrates[j].bitrate == rate) {
  86                                 *rates |= BIT(j);
  87                                 count++;
  88                                 break;
  89                         }
  90         }
  91
  92         return count;
  93 }
  94
  95 /* also used by mesh code */
  96 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
  97                             struct ieee802_11_elems *elems,
  98                             enum ieee80211_band band)
  99 {
 100         struct ieee80211_supported_band *sband;
 101         struct ieee80211_rate *bitrates;
 102         size_t num_rates;
 103         u32 supp_rates;
 104         int i, j;
 105         sband = local->hw.wiphy->bands[band];
 106
 107         if (!sband) {
 108                 WARN_ON(1);
 109                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 110         }
 111
 112         bitrates = sband->bitrates;
 113         num_rates = sband->n_bitrates;
 114         supp_rates = 0;
 115         for (i = 0; i < elems->supp_rates_len +
 116                      elems->ext_supp_rates_len; i++) {
 117                 u8 rate = 0;
 118                 int own_rate;
 119                 if (i < elems->supp_rates_len)
 120                         rate = elems->supp_rates[i];
 121                 else if (elems->ext_supp_rates)
 122                         rate = elems->ext_supp_rates
 123                                 [i - elems->supp_rates_len];
 124                 own_rate = 5 * (rate & 0x7f);
 125                 for (j = 0; j < num_rates; j++)
 126                         if (bitrates[j].bitrate == own_rate)
 127                                 supp_rates |= BIT(j);
 128         }
 129         return supp_rates;
 130 }
 131
 132 /* frame sending functions */
 133
 134 static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
 135 {
 136         if (ies)
 137                 memcpy(skb_put(skb, ies_len), ies, ies_len);
 138 }
 139
 140 /* also used by scanning code */
 141 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 142                               u8 *ssid, size_t ssid_len)
 143 {
 144         struct ieee80211_local *local = sdata->local;
 145         struct ieee80211_supported_band *sband;
 146         struct sk_buff *skb;
 147         struct ieee80211_mgmt *mgmt;
 148         u8 *pos, *supp_rates, *esupp_rates = NULL;
 149         int i;
 150
 151         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 152                             sdata->u.sta.ie_probereq_len);
 153         if (!skb) {
 154                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 155                        "request\n", sdata->dev->name);
 156                 return;
 157         }
 158         skb_reserve(skb, local->hw.extra_tx_headroom);
 159
 160         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 161         memset(mgmt, 0, 24);
 162         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 163                                           IEEE80211_STYPE_PROBE_REQ);
 164         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 165         if (dst) {
 166                 memcpy(mgmt->da, dst, ETH_ALEN);
 167                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 168         } else {
 169                 memset(mgmt->da, 0xff, ETH_ALEN);
 170                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 171         }
 172         pos = skb_put(skb, 2 + ssid_len);
 173         *pos++ = WLAN_EID_SSID;
 174         *pos++ = ssid_len;
 175         memcpy(pos, ssid, ssid_len);
 176
 177         supp_rates = skb_put(skb, 2);
 178         supp_rates[0] = WLAN_EID_SUPP_RATES;
 179         supp_rates[1] = 0;
 180         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 181
 182         for (i = 0; i < sband->n_bitrates; i++) {
 183                 struct ieee80211_rate *rate = &sband->bitrates[i];
 184                 if (esupp_rates) {
 185                         pos = skb_put(skb, 1);
 186                         esupp_rates[1]++;
 187                 } else if (supp_rates[1] == 8) {
 188                         esupp_rates = skb_put(skb, 3);
 189                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 190                         esupp_rates[1] = 1;
 191                         pos = &esupp_rates[2];
 192                 } else {
 193                         pos = skb_put(skb, 1);
 194                         supp_rates[1]++;
 195                 }
 196                 *pos = rate->bitrate / 5;
 197         }
 198
 199         add_extra_ies(skb, sdata->u.sta.ie_probereq,
 200                       sdata->u.sta.ie_probereq_len);
 201
 202         ieee80211_tx_skb(sdata, skb, 0);
 203 }
 204
 205 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 206                                 struct ieee80211_if_sta *ifsta,
 207                                 int transaction, u8 *extra, size_t extra_len,
 208                                 int encrypt)
 209 {
 210         struct ieee80211_local *local = sdata->local;
 211         struct sk_buff *skb;
 212         struct ieee80211_mgmt *mgmt;
 213
 214         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 215                             sizeof(*mgmt) + 6 + extra_len +
 216                             sdata->u.sta.ie_auth_len);
 217         if (!skb) {
 218                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 219                        "frame\n", sdata->dev->name);
 220                 return;
 221         }
 222         skb_reserve(skb, local->hw.extra_tx_headroom);
 223
 224         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 225         memset(mgmt, 0, 24 + 6);
 226         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 227                                           IEEE80211_STYPE_AUTH);
 228         if (encrypt)
 229                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 230         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 231         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 232         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 233         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 234         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 235         ifsta->auth_transaction = transaction + 1;
 236         mgmt->u.auth.status_code = cpu_to_le16(0);
 237         if (extra)
 238                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 239         add_extra_ies(skb, sdata->u.sta.ie_auth, sdata->u.sta.ie_auth_len);
 240
 241         ieee80211_tx_skb(sdata, skb, encrypt);
 242 }
 243
 244 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 245                                  struct ieee80211_if_sta *ifsta)
 246 {
 247         struct ieee80211_local *local = sdata->local;
 248         struct sk_buff *skb;
 249         struct ieee80211_mgmt *mgmt;
 250         u8 *pos, *ies, *ht_ie, *e_ies;
 251         int i, len, count, rates_len, supp_rates_len;
 252         u16 capab;
 253         struct ieee80211_bss *bss;
 254         int wmm = 0;
 255         struct ieee80211_supported_band *sband;
 256         u32 rates = 0;
 257         size_t e_ies_len;
 258
 259         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 260                 e_ies = sdata->u.sta.ie_reassocreq;
 261                 e_ies_len = sdata->u.sta.ie_reassocreq_len;
 262         } else {
 263                 e_ies = sdata->u.sta.ie_assocreq;
 264                 e_ies_len = sdata->u.sta.ie_assocreq_len;
 265         }
 266
 267         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 268                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 269                             ifsta->ssid_len + e_ies_len);
 270         if (!skb) {
 271                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 272                        "frame\n", sdata->dev->name);
 273                 return;
 274         }
 275         skb_reserve(skb, local->hw.extra_tx_headroom);
 276
 277         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 278
 279         capab = ifsta->capab;
 280
 281         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 282                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 283                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 284                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 285                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 286         }
 287
 288         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 289                                    local->hw.conf.channel->center_freq,
 290                                    ifsta->ssid, ifsta->ssid_len);
 291         if (bss) {
 292                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 293                         capab |= WLAN_CAPABILITY_PRIVACY;
 294                 if (bss->wmm_used)
 295                         wmm = 1;
 296
 297                 /* get all rates supported by the device and the AP as
 298                  * some APs don't like getting a superset of their rates
 299                  * in the association request (e.g. D-Link DAP 1353 in
 300                  * b-only mode) */
 301                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 302
 303                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 304                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 305                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 306
 307                 ieee80211_rx_bss_put(local, bss);
 308         } else {
 309                 rates = ~0;
 310                 rates_len = sband->n_bitrates;
 311         }
 312
 313         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 314         memset(mgmt, 0, 24);
 315         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 316         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 317         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 318
 319         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 320                 skb_put(skb, 10);
 321                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 322                                                   IEEE80211_STYPE_REASSOC_REQ);
 323                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 324                 mgmt->u.reassoc_req.listen_interval =
 325                                 cpu_to_le16(local->hw.conf.listen_interval);
 326                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 327                        ETH_ALEN);
 328         } else {
 329                 skb_put(skb, 4);
 330                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 331                                                   IEEE80211_STYPE_ASSOC_REQ);
 332                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 333                 mgmt->u.assoc_req.listen_interval =
 334                                 cpu_to_le16(local->hw.conf.listen_interval);
 335         }
 336
 337         /* SSID */
 338         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 339         *pos++ = WLAN_EID_SSID;
 340         *pos++ = ifsta->ssid_len;
 341         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 342
 343         /* add all rates which were marked to be used above */
 344         supp_rates_len = rates_len;
 345         if (supp_rates_len > 8)
 346                 supp_rates_len = 8;
 347
 348         len = sband->n_bitrates;
 349         pos = skb_put(skb, supp_rates_len + 2);
 350         *pos++ = WLAN_EID_SUPP_RATES;
 351         *pos++ = supp_rates_len;
 352
 353         count = 0;
 354         for (i = 0; i < sband->n_bitrates; i++) {
 355                 if (BIT(i) & rates) {
 356                         int rate = sband->bitrates[i].bitrate;
 357                         *pos++ = (u8) (rate / 5);
 358                         if (++count == 8)
 359                                 break;
 360                 }
 361         }
 362
 363         if (rates_len > count) {
 364                 pos = skb_put(skb, rates_len - count + 2);
 365                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 366                 *pos++ = rates_len - count;
 367
 368                 for (i++; i < sband->n_bitrates; i++) {
 369                         if (BIT(i) & rates) {
 370                                 int rate = sband->bitrates[i].bitrate;
 371                                 *pos++ = (u8) (rate / 5);
 372                         }
 373                 }
 374         }
 375
 376         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 377                 /* 1. power capabilities */
 378                 pos = skb_put(skb, 4);
 379                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 380                 *pos++ = 2;
 381                 *pos++ = 0; /* min tx power */
 382                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 383
 384                 /* 2. supported channels */
 385                 /* TODO: get this in reg domain format */
 386                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 387                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 388                 *pos++ = 2 * sband->n_channels;
 389                 for (i = 0; i < sband->n_channels; i++) {
 390                         *pos++ = ieee80211_frequency_to_channel(
 391                                         sband->channels[i].center_freq);
 392                         *pos++ = 1; /* one channel in the subband*/
 393                 }
 394         }
 395
 396         if (ifsta->extra_ie) {
 397                 pos = skb_put(skb, ifsta->extra_ie_len);
 398                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 399         }
 400
 401         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 402                 pos = skb_put(skb, 9);
 403                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 404                 *pos++ = 7; /* len */
 405                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 406                 *pos++ = 0x50;
 407                 *pos++ = 0xf2;
 408                 *pos++ = 2; /* WME */
 409                 *pos++ = 0; /* WME info */
 410                 *pos++ = 1; /* WME ver */
 411                 *pos++ = 0;
 412         }
 413
 414         /* wmm support is a must to HT */
 415         /*
 416          * IEEE802.11n does not allow TKIP/WEP as pairwise
 417          * ciphers in HT mode. We still associate in non-ht
 418          * mode (11a/b/g) if any one of these ciphers is
 419          * configured as pairwise.
 420          */
 421         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
 422             sband->ht_cap.ht_supported &&
 423             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 424             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 425             (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 426                 struct ieee80211_ht_info *ht_info =
 427                         (struct ieee80211_ht_info *)(ht_ie + 2);
 428                 u16 cap = sband->ht_cap.cap;
 429                 __le16 tmp;
 430                 u32 flags = local->hw.conf.channel->flags;
 431
 432                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 433                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 434                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 435                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 436                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 437                         }
 438                         break;
 439                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 440                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 441                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 442                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 443                         }
 444                         break;
 445                 }
 446
 447                 tmp = cpu_to_le16(cap);
 448                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 449                 *pos++ = WLAN_EID_HT_CAPABILITY;
 450                 *pos++ = sizeof(struct ieee80211_ht_cap);
 451                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 452                 memcpy(pos, &tmp, sizeof(u16));
 453                 pos += sizeof(u16);
 454                 /* TODO: needs a define here for << 2 */
 455                 *pos++ = sband->ht_cap.ampdu_factor |
 456                          (sband->ht_cap.ampdu_density << 2);
 457                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 458         }
 459
 460         add_extra_ies(skb, e_ies, e_ies_len);
 461
 462         kfree(ifsta->assocreq_ies);
 463         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 464         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 465         if (ifsta->assocreq_ies)
 466                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 467
 468         ieee80211_tx_skb(sdata, skb, 0);
 469 }
 470
 471
 472 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 473                                            u16 stype, u16 reason)
 474 {
 475         struct ieee80211_local *local = sdata->local;
 476         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 477         struct sk_buff *skb;
 478         struct ieee80211_mgmt *mgmt;
 479         u8 *ies;
 480         size_t ies_len;
 481
 482         if (stype == IEEE80211_STYPE_DEAUTH) {
 483                 ies = sdata->u.sta.ie_deauth;
 484                 ies_len = sdata->u.sta.ie_deauth_len;
 485         } else {
 486                 ies = sdata->u.sta.ie_disassoc;
 487                 ies_len = sdata->u.sta.ie_disassoc_len;
 488         }
 489
 490         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
 491                             ies_len);
 492         if (!skb) {
 493                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 494                        "deauth/disassoc frame\n", sdata->dev->name);
 495                 return;
 496         }
 497         skb_reserve(skb, local->hw.extra_tx_headroom);
 498
 499         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 500         memset(mgmt, 0, 24);
 501         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 502         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 503         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 504         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 505         skb_put(skb, 2);
 506         /* u.deauth.reason_code == u.disassoc.reason_code */
 507         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 508
 509         add_extra_ies(skb, ies, ies_len);
 510
 511         ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
 512 }
 513
 514 void ieee80211_send_pspoll(struct ieee80211_local *local,
 515                            struct ieee80211_sub_if_data *sdata)
 516 {
 517         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 518         struct ieee80211_pspoll *pspoll;
 519         struct sk_buff *skb;
 520         u16 fc;
 521
 522         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 523         if (!skb) {
 524                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 525                        "pspoll frame\n", sdata->dev->name);
 526                 return;
 527         }
 528         skb_reserve(skb, local->hw.extra_tx_headroom);
 529
 530         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 531         memset(pspoll, 0, sizeof(*pspoll));
 532         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 533         pspoll->frame_control = cpu_to_le16(fc);
 534         pspoll->aid = cpu_to_le16(ifsta->aid);
 535
 536         /* aid in PS-Poll has its two MSBs each set to 1 */
 537         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 538
 539         memcpy(pspoll->bssid, ifsta->bssid, ETH_ALEN);
 540         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 541
 542         ieee80211_tx_skb(sdata, skb, 0);
 543
 544         return;
 545 }
 546
 547 /* MLME */
 548 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 549                                          const size_t supp_rates_len,
 550                                          const u8 *supp_rates)
 551 {
 552         struct ieee80211_local *local = sdata->local;
 553         int i, have_higher_than_11mbit = 0;
 554
 555         /* cf. IEEE 802.11 9.2.12 */
 556         for (i = 0; i < supp_rates_len; i++)
 557                 if ((supp_rates[i] & 0x7f) * 5 > 110)
 558                         have_higher_than_11mbit = 1;
 559
 560         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 561             have_higher_than_11mbit)
 562                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 563         else
 564                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 565
 566         ieee80211_set_wmm_default(sdata);
 567 }
 568
 569 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 570                                      struct ieee80211_if_sta *ifsta,
 571                                      u8 *wmm_param, size_t wmm_param_len)
 572 {
 573         struct ieee80211_tx_queue_params params;
 574         size_t left;
 575         int count;
 576         u8 *pos;
 577
 578         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
 579                 return;
 580
 581         if (!wmm_param)
 582                 return;
 583
 584         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 585                 return;
 586         count = wmm_param[6] & 0x0f;
 587         if (count == ifsta->wmm_last_param_set)
 588                 return;
 589         ifsta->wmm_last_param_set = count;
 590
 591         pos = wmm_param + 8;
 592         left = wmm_param_len - 8;
 593
 594         memset(&params, 0, sizeof(params));
 595
 596         if (!local->ops->conf_tx)
 597                 return;
 598
 599         local->wmm_acm = 0;
 600         for (; left >= 4; left -= 4, pos += 4) {
 601                 int aci = (pos[0] >> 5) & 0x03;
 602                 int acm = (pos[0] >> 4) & 0x01;
 603                 int queue;
 604
 605                 switch (aci) {
 606                 case 1:
 607                         queue = 3;
 608                         if (acm)
 609                                 local->wmm_acm |= BIT(0) | BIT(3);
 610                         break;
 611                 case 2:
 612                         queue = 1;
 613                         if (acm)
 614                                 local->wmm_acm |= BIT(4) | BIT(5);
 615                         break;
 616                 case 3:
 617                         queue = 0;
 618                         if (acm)
 619                                 local->wmm_acm |= BIT(6) | BIT(7);
 620                         break;
 621                 case 0:
 622                 default:
 623                         queue = 2;
 624                         if (acm)
 625                                 local->wmm_acm |= BIT(1) | BIT(2);
 626                         break;
 627                 }
 628
 629                 params.aifs = pos[0] & 0x0f;
 630                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 631                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 632                 params.txop = get_unaligned_le16(pos + 2);
 633 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 634                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 635                        "cWmin=%d cWmax=%d txop=%d\n",
 636                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 637                        params.cw_max, params.txop);
 638 #endif
 639                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 640                  * AC for now) */
 641                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 642                         printk(KERN_DEBUG "%s: failed to set TX queue "
 643                                "parameters for queue %d\n", local->mdev->name, queue);
 644                 }
 645         }
 646 }
 647
 648 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
 649 {
 650         u8 mask;
 651         u8 index, indexn1, indexn2;
 652         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 653
 654         aid &= 0x3fff;
 655         index = aid / 8;
 656         mask  = 1 << (aid & 7);
 657
 658         indexn1 = tim->bitmap_ctrl & 0xfe;
 659         indexn2 = elems->tim_len + indexn1 - 4;
 660
 661         if (index < indexn1 || index > indexn2)
 662                 return false;
 663
 664         index -= indexn1;
 665
 666         return !!(tim->virtual_map[index] & mask);
 667 }
 668
 669 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 670                                            u16 capab, bool erp_valid, u8 erp)
 671 {
 672         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 673 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 674         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 675 #endif
 676         u32 changed = 0;
 677         bool use_protection;
 678         bool use_short_preamble;
 679         bool use_short_slot;
 680
 681         if (erp_valid) {
 682                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 683                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 684         } else {
 685                 use_protection = false;
 686                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 687         }
 688
 689         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 690
 691         if (use_protection != bss_conf->use_cts_prot) {
 692 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 693                 if (net_ratelimit()) {
 694                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 695                                sdata->dev->name,
 696                                use_protection ? "enabled" : "disabled",
 697                                ifsta->bssid);
 698                 }
 699 #endif
 700                 bss_conf->use_cts_prot = use_protection;
 701                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 702         }
 703
 704         if (use_short_preamble != bss_conf->use_short_preamble) {
 705 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 706                 if (net_ratelimit()) {
 707                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 708                                " (BSSID=%pM)\n",
 709                                sdata->dev->name,
 710                                use_short_preamble ? "short" : "long",
 711                                ifsta->bssid);
 712                 }
 713 #endif
 714                 bss_conf->use_short_preamble = use_short_preamble;
 715                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 716         }
 717
 718         if (use_short_slot != bss_conf->use_short_slot) {
 719 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 720                 if (net_ratelimit()) {
 721                         printk(KERN_DEBUG "%s: switched to %s slot time"
 722                                " (BSSID=%pM)\n",
 723                                sdata->dev->name,
 724                                use_short_slot ? "short" : "long",
 725                                ifsta->bssid);
 726                 }
 727 #endif
 728                 bss_conf->use_short_slot = use_short_slot;
 729                 changed |= BSS_CHANGED_ERP_SLOT;
 730         }
 731
 732         return changed;
 733 }
 734
 735 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
 736                                         struct ieee80211_if_sta *ifsta)
 737 {
 738         union iwreq_data wrqu;
 739         memset(&wrqu, 0, sizeof(wrqu));
 740         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
 741                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 742         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 743         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 744 }
 745
 746 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 747                                          struct ieee80211_if_sta *ifsta)
 748 {
 749         char *buf;
 750         size_t len;
 751         int i;
 752         union iwreq_data wrqu;
 753
 754         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 755                 return;
 756
 757         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 758                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 759         if (!buf)
 760                 return;
 761
 762         len = sprintf(buf, "ASSOCINFO(");
 763         if (ifsta->assocreq_ies) {
 764                 len += sprintf(buf + len, "ReqIEs=");
 765                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 766                         len += sprintf(buf + len, "%02x",
 767                                        ifsta->assocreq_ies[i]);
 768                 }
 769         }
 770         if (ifsta->assocresp_ies) {
 771                 if (ifsta->assocreq_ies)
 772                         len += sprintf(buf + len, " ");
 773                 len += sprintf(buf + len, "RespIEs=");
 774                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 775                         len += sprintf(buf + len, "%02x",
 776                                        ifsta->assocresp_ies[i]);
 777                 }
 778         }
 779         len += sprintf(buf + len, ")");
 780
 781         if (len > IW_CUSTOM_MAX) {
 782                 len = sprintf(buf, "ASSOCRESPIE=");
 783                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 784                         len += sprintf(buf + len, "%02x",
 785                                        ifsta->assocresp_ies[i]);
 786                 }
 787         }
 788
 789         if (len <= IW_CUSTOM_MAX) {
 790                 memset(&wrqu, 0, sizeof(wrqu));
 791                 wrqu.data.length = len;
 792                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 793         }
 794
 795         kfree(buf);
 796 }
 797
 798
 799 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 800                                      struct ieee80211_if_sta *ifsta,
 801                                      u32 bss_info_changed)
 802 {
 803         struct ieee80211_local *local = sdata->local;
 804         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 805
 806         struct ieee80211_bss *bss;
 807
 808         bss_info_changed |= BSS_CHANGED_ASSOC;
 809         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 810
 811         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 812                 return;
 813
 814         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 815                                    conf->channel->center_freq,
 816                                    ifsta->ssid, ifsta->ssid_len);
 817         if (bss) {
 818                 /* set timing information */
 819                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 820                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 821                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 822
 823                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 824                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 825
 826                 ieee80211_rx_bss_put(local, bss);
 827         }
 828
 829         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 830         memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 831         ieee80211_sta_send_associnfo(sdata, ifsta);
 832
 833         ifsta->last_probe = jiffies;
 834         ieee80211_led_assoc(local, 1);
 835
 836         sdata->vif.bss_conf.assoc = 1;
 837         /*
 838          * For now just always ask the driver to update the basic rateset
 839          * when we have associated, we aren't checking whether it actually
 840          * changed or not.
 841          */
 842         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 843         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 844
 845         if (local->powersave) {
 846                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 847                     local->hw.conf.dynamic_ps_timeout > 0) {
 848                         mod_timer(&local->dynamic_ps_timer, jiffies +
 849                                   msecs_to_jiffies(
 850                                         local->hw.conf.dynamic_ps_timeout));
 851                 } else {
 852                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 853                                 ieee80211_send_nullfunc(local, sdata, 1);
 854                         conf->flags |= IEEE80211_CONF_PS;
 855                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 856                 }
 857         }
 858
 859         netif_tx_start_all_queues(sdata->dev);
 860         netif_carrier_on(sdata->dev);
 861
 862         ieee80211_sta_send_apinfo(sdata, ifsta);
 863 }
 864
 865 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 866                                    struct ieee80211_if_sta *ifsta)
 867 {
 868         ifsta->direct_probe_tries++;
 869         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 870                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 871                        sdata->dev->name, ifsta->bssid);
 872                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 873                 ieee80211_sta_send_apinfo(sdata, ifsta);
 874
 875                 /*
 876                  * Most likely AP is not in the range so remove the
 877                  * bss information associated to the AP
 878                  */
 879                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 880                                 sdata->local->hw.conf.channel->center_freq,
 881                                 ifsta->ssid, ifsta->ssid_len);
 882                 return;
 883         }
 884
 885         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 886                         sdata->dev->name, ifsta->bssid,
 887                         ifsta->direct_probe_tries);
 888
 889         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 890
 891         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 892
 893         /* Direct probe is sent to broadcast address as some APs
 894          * will not answer to direct packet in unassociated state.
 895          */
 896         ieee80211_send_probe_req(sdata, NULL,
 897                                  ifsta->ssid, ifsta->ssid_len);
 898
 899         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 900 }
 901
 902
 903 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 904                                    struct ieee80211_if_sta *ifsta)
 905 {
 906         ifsta->auth_tries++;
 907         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 908                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 909                        " timed out\n",
 910                        sdata->dev->name, ifsta->bssid);
 911                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 912                 ieee80211_sta_send_apinfo(sdata, ifsta);
 913                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 914                                 sdata->local->hw.conf.channel->center_freq,
 915                                 ifsta->ssid, ifsta->ssid_len);
 916                 return;
 917         }
 918
 919         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 920         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 921                sdata->dev->name, ifsta->bssid);
 922
 923         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 924
 925         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 926 }
 927
 928 /*
 929  * The disassoc 'reason' argument can be either our own reason
 930  * if self disconnected or a reason code from the AP.
 931  */
 932 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 933                                    struct ieee80211_if_sta *ifsta, bool deauth,
 934                                    bool self_disconnected, u16 reason)
 935 {
 936         struct ieee80211_local *local = sdata->local;
 937         struct sta_info *sta;
 938         u32 changed = 0, config_changed = 0;
 939
 940         rcu_read_lock();
 941
 942         sta = sta_info_get(local, ifsta->bssid);
 943         if (!sta) {
 944                 rcu_read_unlock();
 945                 return;
 946         }
 947
 948         if (deauth) {
 949                 ifsta->direct_probe_tries = 0;
 950                 ifsta->auth_tries = 0;
 951         }
 952         ifsta->assoc_scan_tries = 0;
 953         ifsta->assoc_tries = 0;
 954
 955         netif_tx_stop_all_queues(sdata->dev);
 956         netif_carrier_off(sdata->dev);
 957
 958         ieee80211_sta_tear_down_BA_sessions(sta);
 959
 960         if (self_disconnected) {
 961                 if (deauth)
 962                         ieee80211_send_deauth_disassoc(sdata,
 963                                 IEEE80211_STYPE_DEAUTH, reason);
 964                 else
 965                         ieee80211_send_deauth_disassoc(sdata,
 966                                 IEEE80211_STYPE_DISASSOC, reason);
 967         }
 968
 969         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 970         changed |= ieee80211_reset_erp_info(sdata);
 971
 972         ieee80211_led_assoc(local, 0);
 973         changed |= BSS_CHANGED_ASSOC;
 974         sdata->vif.bss_conf.assoc = false;
 975
 976         ieee80211_sta_send_apinfo(sdata, ifsta);
 977
 978         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 979                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 980                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
 981                                 sdata->local->hw.conf.channel->center_freq,
 982                                 ifsta->ssid, ifsta->ssid_len);
 983         }
 984
 985         rcu_read_unlock();
 986
 987         /* channel(_type) changes are handled by ieee80211_hw_config */
 988         local->oper_channel_type = NL80211_CHAN_NO_HT;
 989
 990         local->power_constr_level = 0;
 991
 992         del_timer_sync(&local->dynamic_ps_timer);
 993         cancel_work_sync(&local->dynamic_ps_enable_work);
 994
 995         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 996                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 997                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 998         }
 999
1000         ieee80211_hw_config(local, config_changed);
1001         ieee80211_bss_info_change_notify(sdata, changed);
1002
1003         rcu_read_lock();
1004
1005         sta = sta_info_get(local, ifsta->bssid);
1006         if (!sta) {
1007                 rcu_read_unlock();
1008                 return;
1009         }
1010
1011         sta_info_unlink(&sta);
1012
1013         rcu_read_unlock();
1014
1015         sta_info_destroy(sta);
1016 }
1017
1018 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1019 {
1020         if (!sdata || !sdata->default_key ||
1021             sdata->default_key->conf.alg != ALG_WEP)
1022                 return 0;
1023         return 1;
1024 }
1025
1026 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
1027                                       struct ieee80211_if_sta *ifsta)
1028 {
1029         struct ieee80211_local *local = sdata->local;
1030         struct ieee80211_bss *bss;
1031         int bss_privacy;
1032         int wep_privacy;
1033         int privacy_invoked;
1034
1035         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1036                 return 0;
1037
1038         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1039                                    local->hw.conf.channel->center_freq,
1040                                    ifsta->ssid, ifsta->ssid_len);
1041         if (!bss)
1042                 return 0;
1043
1044         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1045         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1046         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1047
1048         ieee80211_rx_bss_put(local, bss);
1049
1050         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1051                 return 0;
1052
1053         return 1;
1054 }
1055
1056 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1057                                 struct ieee80211_if_sta *ifsta)
1058 {
1059         ifsta->assoc_tries++;
1060         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1061                 printk(KERN_DEBUG "%s: association with AP %pM"
1062                        " timed out\n",
1063                        sdata->dev->name, ifsta->bssid);
1064                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1065                 ieee80211_sta_send_apinfo(sdata, ifsta);
1066                 ieee80211_rx_bss_remove(sdata, ifsta->bssid,
1067                                 sdata->local->hw.conf.channel->center_freq,
1068                                 ifsta->ssid, ifsta->ssid_len);
1069                 return;
1070         }
1071
1072         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1073         printk(KERN_DEBUG "%s: associate with AP %pM\n",
1074                sdata->dev->name, ifsta->bssid);
1075         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1076                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1077                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1078                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1079                 return;
1080         }
1081
1082         ieee80211_send_assoc(sdata, ifsta);
1083
1084         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1085 }
1086
1087
1088 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1089                                  struct ieee80211_if_sta *ifsta)
1090 {
1091         struct ieee80211_local *local = sdata->local;
1092         struct sta_info *sta;
1093         int disassoc;
1094
1095         /* TODO: start monitoring current AP signal quality and number of
1096          * missed beacons. Scan other channels every now and then and search
1097          * for better APs. */
1098         /* TODO: remove expired BSSes */
1099
1100         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1101
1102         rcu_read_lock();
1103
1104         sta = sta_info_get(local, ifsta->bssid);
1105         if (!sta) {
1106                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
1107                        sdata->dev->name, ifsta->bssid);
1108                 disassoc = 1;
1109         } else {
1110                 disassoc = 0;
1111                 if (time_after(jiffies,
1112                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1113                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1114                                 printk(KERN_DEBUG "%s: No ProbeResp from "
1115                                        "current AP %pM - assume out of "
1116                                        "range\n",
1117                                        sdata->dev->name, ifsta->bssid);
1118                                 disassoc = 1;
1119                         } else
1120                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1121                                                          ifsta->ssid,
1122                                                          ifsta->ssid_len);
1123                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1124                 } else {
1125                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1126                         if (time_after(jiffies, ifsta->last_probe +
1127                                        IEEE80211_PROBE_INTERVAL)) {
1128                                 ifsta->last_probe = jiffies;
1129                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1130                                                          ifsta->ssid,
1131                                                          ifsta->ssid_len);
1132                         }
1133                 }
1134         }
1135
1136         rcu_read_unlock();
1137
1138         if (disassoc)
1139                 ieee80211_set_disassoc(sdata, ifsta, true, true,
1140                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1141         else
1142                 mod_timer(&ifsta->timer, jiffies +
1143                                       IEEE80211_MONITORING_INTERVAL);
1144 }
1145
1146
1147 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1148                                      struct ieee80211_if_sta *ifsta)
1149 {
1150         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1151         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1152         ieee80211_associate(sdata, ifsta);
1153 }
1154
1155
1156 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1157                                      struct ieee80211_if_sta *ifsta,
1158                                      struct ieee80211_mgmt *mgmt,
1159                                      size_t len)
1160 {
1161         u8 *pos;
1162         struct ieee802_11_elems elems;
1163
1164         pos = mgmt->u.auth.variable;
1165         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1166         if (!elems.challenge)
1167                 return;
1168         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1169                             elems.challenge_len + 2, 1);
1170 }
1171
1172 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1173                                    struct ieee80211_if_sta *ifsta,
1174                                    struct ieee80211_mgmt *mgmt,
1175                                    size_t len)
1176 {
1177         u16 auth_alg, auth_transaction, status_code;
1178
1179         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1180             sdata->vif.type != NL80211_IFTYPE_ADHOC)
1181                 return;
1182
1183         if (len < 24 + 6)
1184                 return;
1185
1186         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1187             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1188                 return;
1189
1190         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1191             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1192                 return;
1193
1194         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1195         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1196         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1197
1198         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1199                 /*
1200                  * IEEE 802.11 standard does not require authentication in IBSS
1201                  * networks and most implementations do not seem to use it.
1202                  * However, try to reply to authentication attempts if someone
1203                  * has actually implemented this.
1204                  */
1205                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1206                         return;
1207                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1208                 return;
1209         }
1210
1211         if (auth_alg != ifsta->auth_alg ||
1212             auth_transaction != ifsta->auth_transaction)
1213                 return;
1214
1215         if (status_code != WLAN_STATUS_SUCCESS) {
1216                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1217                         u8 algs[3];
1218                         const int num_algs = ARRAY_SIZE(algs);
1219                         int i, pos;
1220                         algs[0] = algs[1] = algs[2] = 0xff;
1221                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1222                                 algs[0] = WLAN_AUTH_OPEN;
1223                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1224                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1225                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1226                                 algs[2] = WLAN_AUTH_LEAP;
1227                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1228                                 pos = 0;
1229                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1230                                 pos = 1;
1231                         else
1232                                 pos = 2;
1233                         for (i = 0; i < num_algs; i++) {
1234                                 pos++;
1235                                 if (pos >= num_algs)
1236                                         pos = 0;
1237                                 if (algs[pos] == ifsta->auth_alg ||
1238                                     algs[pos] == 0xff)
1239                                         continue;
1240                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1241                                     !ieee80211_sta_wep_configured(sdata))
1242                                         continue;
1243                                 ifsta->auth_alg = algs[pos];
1244                                 break;
1245                         }
1246                 }
1247                 return;
1248         }
1249
1250         switch (ifsta->auth_alg) {
1251         case WLAN_AUTH_OPEN:
1252         case WLAN_AUTH_LEAP:
1253                 ieee80211_auth_completed(sdata, ifsta);
1254                 break;
1255         case WLAN_AUTH_SHARED_KEY:
1256                 if (ifsta->auth_transaction == 4)
1257                         ieee80211_auth_completed(sdata, ifsta);
1258                 else
1259                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1260                 break;
1261         }
1262 }
1263
1264
1265 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1266                                      struct ieee80211_if_sta *ifsta,
1267                                      struct ieee80211_mgmt *mgmt,
1268                                      size_t len)
1269 {
1270         u16 reason_code;
1271
1272         if (len < 24 + 2)
1273                 return;
1274
1275         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1276                 return;
1277
1278         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1279
1280         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1281                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1282                                 sdata->dev->name, reason_code);
1283
1284         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1285             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1286             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1287                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1288                 mod_timer(&ifsta->timer, jiffies +
1289                                       IEEE80211_RETRY_AUTH_INTERVAL);
1290         }
1291
1292         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1293         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1294 }
1295
1296
1297 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1298                                        struct ieee80211_if_sta *ifsta,
1299                                        struct ieee80211_mgmt *mgmt,
1300                                        size_t len)
1301 {
1302         u16 reason_code;
1303
1304         if (len < 24 + 2)
1305                 return;
1306
1307         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1308                 return;
1309
1310         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1311
1312         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1313                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1314                                 sdata->dev->name, reason_code);
1315
1316         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1317                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1318                 mod_timer(&ifsta->timer, jiffies +
1319                                       IEEE80211_RETRY_AUTH_INTERVAL);
1320         }
1321
1322         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1323 }
1324
1325
1326 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1327                                          struct ieee80211_if_sta *ifsta,
1328                                          struct ieee80211_mgmt *mgmt,
1329                                          size_t len,
1330                                          int reassoc)
1331 {
1332         struct ieee80211_local *local = sdata->local;
1333         struct ieee80211_supported_band *sband;
1334         struct sta_info *sta;
1335         u32 rates, basic_rates;
1336         u16 capab_info, status_code, aid;
1337         struct ieee802_11_elems elems;
1338         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1339         u8 *pos;
1340         u32 changed = 0;
1341         int i, j;
1342         bool have_higher_than_11mbit = false, newsta = false;
1343         u16 ap_ht_cap_flags;
1344
1345         /* AssocResp and ReassocResp have identical structure, so process both
1346          * of them in this function. */
1347
1348         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1349                 return;
1350
1351         if (len < 24 + 6)
1352                 return;
1353
1354         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1355                 return;
1356
1357         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1358         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1359         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1360
1361         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1362                "status=%d aid=%d)\n",
1363                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1364                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1365
1366         pos = mgmt->u.assoc_resp.variable;
1367         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1368
1369         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1370             elems.timeout_int && elems.timeout_int_len == 5 &&
1371             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1372                 u32 tu, ms;
1373                 tu = get_unaligned_le32(elems.timeout_int + 1);
1374                 ms = tu * 1024 / 1000;
1375                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1376                        "comeback duration %u TU (%u ms)\n",
1377                        sdata->dev->name, tu, ms);
1378                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1379                         mod_timer(&ifsta->timer,
1380                                   jiffies + msecs_to_jiffies(ms));
1381                 return;
1382         }
1383
1384         if (status_code != WLAN_STATUS_SUCCESS) {
1385                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1386                        sdata->dev->name, status_code);
1387                 /* if this was a reassociation, ensure we try a "full"
1388                  * association next time. This works around some broken APs
1389                  * which do not correctly reject reassociation requests. */
1390                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1391                 return;
1392         }
1393
1394         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1395                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1396                        "set\n", sdata->dev->name, aid);
1397         aid &= ~(BIT(15) | BIT(14));
1398
1399         if (!elems.supp_rates) {
1400                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1401                        sdata->dev->name);
1402                 return;
1403         }
1404
1405         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1406         ifsta->aid = aid;
1407         ifsta->ap_capab = capab_info;
1408
1409         kfree(ifsta->assocresp_ies);
1410         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1411         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1412         if (ifsta->assocresp_ies)
1413                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1414
1415         rcu_read_lock();
1416
1417         /* Add STA entry for the AP */
1418         sta = sta_info_get(local, ifsta->bssid);
1419         if (!sta) {
1420                 newsta = true;
1421
1422                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1423                 if (!sta) {
1424                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1425                                " the AP\n", sdata->dev->name);
1426                         rcu_read_unlock();
1427                         return;
1428                 }
1429
1430                 /* update new sta with its last rx activity */
1431                 sta->last_rx = jiffies;
1432         }
1433
1434         /*
1435          * FIXME: Do we really need to update the sta_info's information here?
1436          *        We already know about the AP (we found it in our list) so it
1437          *        should already be filled with the right info, no?
1438          *        As is stands, all this is racy because typically we assume
1439          *        the information that is filled in here (except flags) doesn't
1440          *        change while a STA structure is alive. As such, it should move
1441          *        to between the sta_info_alloc() and sta_info_insert() above.
1442          */
1443
1444         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1445                            WLAN_STA_AUTHORIZED);
1446
1447         rates = 0;
1448         basic_rates = 0;
1449         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1450
1451         for (i = 0; i < elems.supp_rates_len; i++) {
1452                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1453                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1454
1455                 if (rate > 110)
1456                         have_higher_than_11mbit = true;
1457
1458                 for (j = 0; j < sband->n_bitrates; j++) {
1459                         if (sband->bitrates[j].bitrate == rate) {
1460                                 rates |= BIT(j);
1461                                 if (is_basic)
1462                                         basic_rates |= BIT(j);
1463                                 break;
1464                         }
1465                 }
1466         }
1467
1468         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1469                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1470                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1471
1472                 if (rate > 110)
1473                         have_higher_than_11mbit = true;
1474
1475                 for (j = 0; j < sband->n_bitrates; j++) {
1476                         if (sband->bitrates[j].bitrate == rate) {
1477                                 rates |= BIT(j);
1478                                 if (is_basic)
1479                                         basic_rates |= BIT(j);
1480                                 break;
1481                         }
1482                 }
1483         }
1484
1485         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1486         sdata->vif.bss_conf.basic_rates = basic_rates;
1487
1488         /* cf. IEEE 802.11 9.2.12 */
1489         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1490             have_higher_than_11mbit)
1491                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1492         else
1493                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1494
1495         if (elems.ht_cap_elem)
1496                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1497                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1498
1499         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1500
1501         rate_control_rate_init(sta);
1502
1503         if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1504                 set_sta_flags(sta, WLAN_STA_MFP);
1505
1506         if (elems.wmm_param)
1507                 set_sta_flags(sta, WLAN_STA_WME);
1508
1509         if (newsta) {
1510                 int err = sta_info_insert(sta);
1511                 if (err) {
1512                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1513                                " the AP (error %d)\n", sdata->dev->name, err);
1514                         rcu_read_unlock();
1515                         return;
1516                 }
1517         }
1518
1519         rcu_read_unlock();
1520
1521         if (elems.wmm_param)
1522                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1523                                          elems.wmm_param_len);
1524
1525         if (elems.ht_info_elem && elems.wmm_param &&
1526             (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1527                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1528                                                ap_ht_cap_flags);
1529
1530         /* set AID and assoc capability,
1531          * ieee80211_set_associated() will tell the driver */
1532         bss_conf->aid = aid;
1533         bss_conf->assoc_capability = capab_info;
1534         ieee80211_set_associated(sdata, ifsta, changed);
1535
1536         ieee80211_associated(sdata, ifsta);
1537 }
1538
1539
1540 static int __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1541                                      struct ieee80211_if_sta *ifsta,
1542                                      const u8 *bssid, const int beacon_int,
1543                                      const int freq,
1544                                      const size_t supp_rates_len,
1545                                      const u8 *supp_rates,
1546                                      const u16 capability)
1547 {
1548         struct ieee80211_local *local = sdata->local;
1549         int res = 0, rates, i, j;
1550         struct sk_buff *skb;
1551         struct ieee80211_mgmt *mgmt;
1552         u8 *pos;
1553         struct ieee80211_supported_band *sband;
1554         union iwreq_data wrqu;
1555
1556         if (local->ops->reset_tsf) {
1557                 /* Reset own TSF to allow time synchronization work. */
1558                 local->ops->reset_tsf(local_to_hw(local));
1559         }
1560
1561         if ((ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) &&
1562            memcmp(ifsta->bssid, bssid, ETH_ALEN) == 0)
1563                 return res;
1564
1565         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1566                             sdata->u.sta.ie_proberesp_len);
1567         if (!skb) {
1568                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1569                        "response\n", sdata->dev->name);
1570                 return -ENOMEM;
1571         }
1572
1573         if (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) {
1574                 /* Remove possible STA entries from other IBSS networks. */
1575                 sta_info_flush_delayed(sdata);
1576         }
1577
1578         memcpy(ifsta->bssid, bssid, ETH_ALEN);
1579         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1580         if (res)
1581                 return res;
1582
1583         local->hw.conf.beacon_int = beacon_int >= 10 ? beacon_int : 10;
1584
1585         sdata->drop_unencrypted = capability &
1586                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1587
1588         res = ieee80211_set_freq(sdata, freq);
1589
1590         if (res)
1591                 return res;
1592
1593         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1594
1595         /* Build IBSS probe response */
1596
1597         skb_reserve(skb, local->hw.extra_tx_headroom);
1598
1599         mgmt = (struct ieee80211_mgmt *)
1600                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1601         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1602         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1603                                           IEEE80211_STYPE_PROBE_RESP);
1604         memset(mgmt->da, 0xff, ETH_ALEN);
1605         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1606         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1607         mgmt->u.beacon.beacon_int =
1608                 cpu_to_le16(local->hw.conf.beacon_int);
1609         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
1610
1611         pos = skb_put(skb, 2 + ifsta->ssid_len);
1612         *pos++ = WLAN_EID_SSID;
1613         *pos++ = ifsta->ssid_len;
1614         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1615
1616         rates = supp_rates_len;
1617         if (rates > 8)
1618                 rates = 8;
1619         pos = skb_put(skb, 2 + rates);
1620         *pos++ = WLAN_EID_SUPP_RATES;
1621         *pos++ = rates;
1622         memcpy(pos, supp_rates, rates);
1623
1624         if (sband->band == IEEE80211_BAND_2GHZ) {
1625                 pos = skb_put(skb, 2 + 1);
1626                 *pos++ = WLAN_EID_DS_PARAMS;
1627                 *pos++ = 1;
1628                 *pos++ = ieee80211_frequency_to_channel(freq);
1629         }
1630
1631         pos = skb_put(skb, 2 + 2);
1632         *pos++ = WLAN_EID_IBSS_PARAMS;
1633         *pos++ = 2;
1634         /* FIX: set ATIM window based on scan results */
1635         *pos++ = 0;
1636         *pos++ = 0;
1637
1638         if (supp_rates_len > 8) {
1639                 rates = supp_rates_len - 8;
1640                 pos = skb_put(skb, 2 + rates);
1641                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1642                 *pos++ = rates;
1643                 memcpy(pos, &supp_rates[8], rates);
1644         }
1645
1646         add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1647                       sdata->u.sta.ie_proberesp_len);
1648
1649         ifsta->probe_resp = skb;
1650
1651         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
1652                                    IEEE80211_IFCC_BEACON_ENABLED);
1653
1654
1655         rates = 0;
1656         for (i = 0; i < supp_rates_len; i++) {
1657                 int bitrate = (supp_rates[i] & 0x7f) * 5;
1658                 for (j = 0; j < sband->n_bitrates; j++)
1659                         if (sband->bitrates[j].bitrate == bitrate)
1660                                 rates |= BIT(j);
1661         }
1662         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1663
1664         ieee80211_sta_def_wmm_params(sdata, supp_rates_len, supp_rates);
1665
1666         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
1667         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1668         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1669
1670         ieee80211_led_assoc(local, true);
1671
1672         memset(&wrqu, 0, sizeof(wrqu));
1673         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
1674         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1675
1676         return res;
1677 }
1678
1679 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1680                                    struct ieee80211_if_sta *ifsta,
1681                                    struct ieee80211_bss *bss)
1682 {
1683         return __ieee80211_sta_join_ibss(sdata, ifsta,
1684                                          bss->cbss.bssid,
1685                                          bss->cbss.beacon_interval,
1686                                          bss->cbss.channel->center_freq,
1687                                          bss->supp_rates_len, bss->supp_rates,
1688                                          bss->cbss.capability);
1689 }
1690
1691 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1692                                   struct ieee80211_mgmt *mgmt,
1693                                   size_t len,
1694                                   struct ieee80211_rx_status *rx_status,
1695                                   struct ieee802_11_elems *elems,
1696                                   bool beacon)
1697 {
1698         struct ieee80211_local *local = sdata->local;
1699         int freq;
1700         struct ieee80211_bss *bss;
1701         struct sta_info *sta;
1702         struct ieee80211_channel *channel;
1703         u64 beacon_timestamp, rx_timestamp;
1704         u32 supp_rates = 0;
1705         enum ieee80211_band band = rx_status->band;
1706
1707         if (elems->ds_params && elems->ds_params_len == 1)
1708                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1709         else
1710                 freq = rx_status->freq;
1711
1712         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1713
1714         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1715                 return;
1716
1717         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1718             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1719                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1720
1721                 rcu_read_lock();
1722
1723                 sta = sta_info_get(local, mgmt->sa);
1724                 if (sta) {
1725                         u32 prev_rates;
1726
1727                         prev_rates = sta->sta.supp_rates[band];
1728                         /* make sure mandatory rates are always added */
1729                         sta->sta.supp_rates[band] = supp_rates |
1730                                 ieee80211_mandatory_rates(local, band);
1731
1732 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1733                         if (sta->sta.supp_rates[band] != prev_rates)
1734                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1735                                     "for %pM based on beacon info (0x%llx | "
1736                                     "0x%llx -> 0x%llx)\n",
1737                                     sdata->dev->name,
1738                                     sta->sta.addr,
1739                                     (unsigned long long) prev_rates,
1740                                     (unsigned long long) supp_rates,
1741                                     (unsigned long long) sta->sta.supp_rates[band]);
1742 #endif
1743                 } else {
1744                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1745                 }
1746
1747                 rcu_read_unlock();
1748         }
1749
1750         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1751                                         channel, beacon);
1752         if (!bss)
1753                 return;
1754
1755         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1756             (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1757                 struct ieee80211_channel_sw_ie *sw_elem =
1758                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1759                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1760         }
1761
1762         /* was just updated in ieee80211_bss_info_update */
1763         beacon_timestamp = bss->cbss.tsf;
1764
1765         /*
1766          * In STA mode, the remaining parameters should not be overridden
1767          * by beacons because they're not necessarily accurate there.
1768          */
1769         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1770             bss->last_probe_resp && beacon) {
1771                 ieee80211_rx_bss_put(local, bss);
1772                 return;
1773         }
1774
1775         /* check if we need to merge IBSS */
1776         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1777             (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1778             bss->cbss.capability & WLAN_CAPABILITY_IBSS &&
1779             bss->cbss.channel == local->oper_channel &&
1780             elems->ssid_len == sdata->u.sta.ssid_len &&
1781             memcmp(elems->ssid, sdata->u.sta.ssid,
1782                                 sdata->u.sta.ssid_len) == 0) {
1783                 if (rx_status->flag & RX_FLAG_TSFT) {
1784                         /* in order for correct IBSS merging we need mactime
1785                          *
1786                          * since mactime is defined as the time the first data
1787                          * symbol of the frame hits the PHY, and the timestamp
1788                          * of the beacon is defined as "the time that the data
1789                          * symbol containing the first bit of the timestamp is
1790                          * transmitted to the PHY plus the transmitting STA’s
1791                          * delays through its local PHY from the MAC-PHY
1792                          * interface to its interface with the WM"
1793                          * (802.11 11.1.2) - equals the time this bit arrives at
1794                          * the receiver - we have to take into account the
1795                          * offset between the two.
1796                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1797                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1798                          */
1799                         int rate;
1800                         if (rx_status->flag & RX_FLAG_HT) {
1801                                 rate = 65; /* TODO: HT rates */
1802                         } else {
1803                                 rate = local->hw.wiphy->bands[band]->
1804                                         bitrates[rx_status->rate_idx].bitrate;
1805                         }
1806                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1807                 } else if (local && local->ops && local->ops->get_tsf)
1808                         /* second best option: get current TSF */
1809                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1810                 else
1811                         /* can't merge without knowing the TSF */
1812                         rx_timestamp = -1LLU;
1813 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1814                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1815                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1816                        mgmt->sa, mgmt->bssid,
1817                        (unsigned long long)rx_timestamp,
1818                        (unsigned long long)beacon_timestamp,
1819                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1820                        jiffies);
1821 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1822                 if (beacon_timestamp > rx_timestamp) {
1823 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1824                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1825                                "local TSF - IBSS merge with BSSID %pM\n",
1826                                sdata->dev->name, mgmt->bssid);
1827 #endif
1828                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1829                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1830                 }
1831         }
1832
1833         ieee80211_rx_bss_put(local, bss);
1834 }
1835
1836
1837 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1838                                          struct ieee80211_mgmt *mgmt,
1839                                          size_t len,
1840                                          struct ieee80211_rx_status *rx_status)
1841 {
1842         size_t baselen;
1843         struct ieee802_11_elems elems;
1844         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1845
1846         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1847                 return; /* ignore ProbeResp to foreign address */
1848
1849         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1850         if (baselen > len)
1851                 return;
1852
1853         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1854                                 &elems);
1855
1856         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1857
1858         /* direct probe may be part of the association flow */
1859         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1860                                                         &ifsta->request)) {
1861                 printk(KERN_DEBUG "%s direct probe responded\n",
1862                        sdata->dev->name);
1863                 ieee80211_authenticate(sdata, ifsta);
1864         }
1865 }
1866
1867
1868 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1869                                      struct ieee80211_mgmt *mgmt,
1870                                      size_t len,
1871                                      struct ieee80211_rx_status *rx_status)
1872 {
1873         struct ieee80211_if_sta *ifsta;
1874         size_t baselen;
1875         struct ieee802_11_elems elems;
1876         struct ieee80211_local *local = sdata->local;
1877         u32 changed = 0;
1878         bool erp_valid, directed_tim;
1879         u8 erp_value = 0;
1880
1881         /* Process beacon from the current BSS */
1882         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1883         if (baselen > len)
1884                 return;
1885
1886         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1887
1888         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1889
1890         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1891                 return;
1892         ifsta = &sdata->u.sta;
1893
1894         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1895             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1896                 return;
1897
1898         if (rx_status->freq != local->hw.conf.channel->center_freq)
1899                 return;
1900
1901         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1902                                  elems.wmm_param_len);
1903
1904         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1905             local->hw.conf.flags & IEEE80211_CONF_PS) {
1906                 directed_tim = ieee80211_check_tim(&elems, ifsta->aid);
1907
1908                 if (directed_tim) {
1909                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1910                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1911                                 ieee80211_hw_config(local,
1912                                                     IEEE80211_CONF_CHANGE_PS);
1913                                 ieee80211_send_nullfunc(local, sdata, 0);
1914                         } else {
1915                                 local->pspolling = true;
1916
1917                                 /*
1918                                  * Here is assumed that the driver will be
1919                                  * able to send ps-poll frame and receive a
1920                                  * response even though power save mode is
1921                                  * enabled, but some drivers might require
1922                                  * to disable power save here. This needs
1923                                  * to be investigated.
1924                                  */
1925                                 ieee80211_send_pspoll(local, sdata);
1926                         }
1927                 }
1928         }
1929
1930         if (elems.erp_info && elems.erp_info_len >= 1) {
1931                 erp_valid = true;
1932                 erp_value = elems.erp_info[0];
1933         } else {
1934                 erp_valid = false;
1935         }
1936         changed |= ieee80211_handle_bss_capability(sdata,
1937                         le16_to_cpu(mgmt->u.beacon.capab_info),
1938                         erp_valid, erp_value);
1939
1940
1941         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1942                 struct sta_info *sta;
1943                 struct ieee80211_supported_band *sband;
1944                 u16 ap_ht_cap_flags;
1945
1946                 rcu_read_lock();
1947
1948                 sta = sta_info_get(local, ifsta->bssid);
1949                 if (!sta) {
1950                         rcu_read_unlock();
1951                         return;
1952                 }
1953
1954                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1955
1956                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1957                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1958
1959                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1960
1961                 rcu_read_unlock();
1962
1963                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1964                                                ap_ht_cap_flags);
1965         }
1966
1967         if (elems.country_elem) {
1968                 /* Note we are only reviewing this on beacons
1969                  * for the BSSID we are associated to */
1970                 regulatory_hint_11d(local->hw.wiphy,
1971                         elems.country_elem, elems.country_elem_len);
1972
1973                 /* TODO: IBSS also needs this */
1974                 if (elems.pwr_constr_elem)
1975                         ieee80211_handle_pwr_constr(sdata,
1976                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1977                                 elems.pwr_constr_elem,
1978                                 elems.pwr_constr_elem_len);
1979         }
1980
1981         ieee80211_bss_info_change_notify(sdata, changed);
1982 }
1983
1984
1985 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1986                                         struct ieee80211_if_sta *ifsta,
1987                                         struct ieee80211_mgmt *mgmt,
1988                                         size_t len)
1989 {
1990         struct ieee80211_local *local = sdata->local;
1991         int tx_last_beacon;
1992         struct sk_buff *skb;
1993         struct ieee80211_mgmt *resp;
1994         u8 *pos, *end;
1995
1996         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1997             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1998             len < 24 + 2 || !ifsta->probe_resp)
1999                 return;
2000
2001         if (local->ops->tx_last_beacon)
2002                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2003         else
2004                 tx_last_beacon = 1;
2005
2006 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2007         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
2008                " (tx_last_beacon=%d)\n",
2009                sdata->dev->name, mgmt->sa, mgmt->da,
2010                mgmt->bssid, tx_last_beacon);
2011 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2012
2013         if (!tx_last_beacon)
2014                 return;
2015
2016         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2017             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2018                 return;
2019
2020         end = ((u8 *) mgmt) + len;
2021         pos = mgmt->u.probe_req.variable;
2022         if (pos[0] != WLAN_EID_SSID ||
2023             pos + 2 + pos[1] > end) {
2024 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2025                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2026                        "from %pM\n",
2027                        sdata->dev->name, mgmt->sa);
2028 #endif
2029                 return;
2030         }
2031         if (pos[1] != 0 &&
2032             (pos[1] != ifsta->ssid_len ||
2033              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2034                 /* Ignore ProbeReq for foreign SSID */
2035                 return;
2036         }
2037
2038         /* Reply with ProbeResp */
2039         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2040         if (!skb)
2041                 return;
2042
2043         resp = (struct ieee80211_mgmt *) skb->data;
2044         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2045 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2046         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
2047                sdata->dev->name, resp->da);
2048 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2049         ieee80211_tx_skb(sdata, skb, 0);
2050 }
2051
2052 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2053                            struct ieee80211_rx_status *rx_status)
2054 {
2055         struct ieee80211_local *local = sdata->local;
2056         struct ieee80211_if_sta *ifsta;
2057         struct ieee80211_mgmt *mgmt;
2058         u16 fc;
2059
2060         if (skb->len < 24)
2061                 goto fail;
2062
2063         ifsta = &sdata->u.sta;
2064
2065         mgmt = (struct ieee80211_mgmt *) skb->data;
2066         fc = le16_to_cpu(mgmt->frame_control);
2067
2068         switch (fc & IEEE80211_FCTL_STYPE) {
2069         case IEEE80211_STYPE_PROBE_REQ:
2070         case IEEE80211_STYPE_PROBE_RESP:
2071         case IEEE80211_STYPE_BEACON:
2072                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2073         case IEEE80211_STYPE_AUTH:
2074         case IEEE80211_STYPE_ASSOC_RESP:
2075         case IEEE80211_STYPE_REASSOC_RESP:
2076         case IEEE80211_STYPE_DEAUTH:
2077         case IEEE80211_STYPE_DISASSOC:
2078                 skb_queue_tail(&ifsta->skb_queue, skb);
2079                 queue_work(local->hw.workqueue, &ifsta->work);
2080                 return;
2081         }
2082
2083  fail:
2084         kfree_skb(skb);
2085 }
2086
2087 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2088                                          struct sk_buff *skb)
2089 {
2090         struct ieee80211_rx_status *rx_status;
2091         struct ieee80211_if_sta *ifsta;
2092         struct ieee80211_mgmt *mgmt;
2093         u16 fc;
2094
2095         ifsta = &sdata->u.sta;
2096
2097         rx_status = (struct ieee80211_rx_status *) skb->cb;
2098         mgmt = (struct ieee80211_mgmt *) skb->data;
2099         fc = le16_to_cpu(mgmt->frame_control);
2100
2101         switch (fc & IEEE80211_FCTL_STYPE) {
2102         case IEEE80211_STYPE_PROBE_REQ:
2103                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2104                 break;
2105         case IEEE80211_STYPE_PROBE_RESP:
2106                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2107                 break;
2108         case IEEE80211_STYPE_BEACON:
2109                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2110                 break;
2111         case IEEE80211_STYPE_AUTH:
2112                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2113                 break;
2114         case IEEE80211_STYPE_ASSOC_RESP:
2115                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2116                 break;
2117         case IEEE80211_STYPE_REASSOC_RESP:
2118                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2119                 break;
2120         case IEEE80211_STYPE_DEAUTH:
2121                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2122                 break;
2123         case IEEE80211_STYPE_DISASSOC:
2124                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2125                 break;
2126         }
2127
2128         kfree_skb(skb);
2129 }
2130
2131
2132 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2133 {
2134         struct ieee80211_local *local = sdata->local;
2135         int active = 0;
2136         struct sta_info *sta;
2137
2138         rcu_read_lock();
2139
2140         list_for_each_entry_rcu(sta, &local->sta_list, list) {
2141                 if (sta->sdata == sdata &&
2142                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2143                                jiffies)) {
2144                         active++;
2145                         break;
2146                 }
2147         }
2148
2149         rcu_read_unlock();
2150
2151         return active;
2152 }
2153
2154
2155 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2156                                      struct ieee80211_if_sta *ifsta)
2157 {
2158         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2159
2160         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2161         if (ieee80211_sta_active_ibss(sdata))
2162                 return;
2163
2164         if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2165             (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2166                 return;
2167
2168         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2169                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2170
2171         /* XXX maybe racy? */
2172         if (sdata->local->scan_req)
2173                 return;
2174
2175         memcpy(sdata->local->int_scan_req.ssids[0].ssid,
2176                ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2177         sdata->local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2178         ieee80211_request_scan(sdata, &sdata->local->int_scan_req);
2179 }
2180
2181
2182 static void ieee80211_sta_timer(unsigned long data)
2183 {
2184         struct ieee80211_sub_if_data *sdata =
2185                 (struct ieee80211_sub_if_data *) data;
2186         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2187         struct ieee80211_local *local = sdata->local;
2188
2189         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2190         queue_work(local->hw.workqueue, &ifsta->work);
2191 }
2192
2193 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2194                                      struct ieee80211_if_sta *ifsta)
2195 {
2196         struct ieee80211_local *local = sdata->local;
2197
2198         if (local->ops->reset_tsf) {
2199                 /* Reset own TSF to allow time synchronization work. */
2200                 local->ops->reset_tsf(local_to_hw(local));
2201         }
2202
2203         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2204
2205
2206         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2207                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2208         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2209                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2210         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2211                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2212         else
2213                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2214         ifsta->auth_transaction = -1;
2215         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2216         ifsta->assoc_scan_tries = 0;
2217         ifsta->direct_probe_tries = 0;
2218         ifsta->auth_tries = 0;
2219         ifsta->assoc_tries = 0;
2220         netif_tx_stop_all_queues(sdata->dev);
2221         netif_carrier_off(sdata->dev);
2222 }
2223
2224 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2225                                      struct ieee80211_if_sta *ifsta)
2226 {
2227         struct ieee80211_local *local = sdata->local;
2228         struct ieee80211_supported_band *sband;
2229         u8 *pos;
2230         u8 bssid[ETH_ALEN];
2231         u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
2232         u16 capability;
2233         int i;
2234
2235         if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
2236                 memcpy(bssid, ifsta->bssid, ETH_ALEN);
2237         } else {
2238                 /* Generate random, not broadcast, locally administered BSSID. Mix in
2239                  * own MAC address to make sure that devices that do not have proper
2240                  * random number generator get different BSSID. */
2241                 get_random_bytes(bssid, ETH_ALEN);
2242                 for (i = 0; i < ETH_ALEN; i++)
2243                         bssid[i] ^= sdata->dev->dev_addr[i];
2244                 bssid[0] &= ~0x01;
2245                 bssid[0] |= 0x02;
2246         }
2247
2248         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2249                sdata->dev->name, bssid);
2250
2251         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2252
2253         if (local->hw.conf.beacon_int == 0)
2254                 local->hw.conf.beacon_int = 100;
2255
2256         capability = WLAN_CAPABILITY_IBSS;
2257
2258         if (sdata->default_key)
2259                 capability |= WLAN_CAPABILITY_PRIVACY;
2260         else
2261                 sdata->drop_unencrypted = 0;
2262
2263         pos = supp_rates;
2264         for (i = 0; i < sband->n_bitrates; i++) {
2265                 int rate = sband->bitrates[i].bitrate;
2266                 *pos++ = (u8) (rate / 5);
2267         }
2268
2269         return __ieee80211_sta_join_ibss(sdata, ifsta,
2270                                          bssid, local->hw.conf.beacon_int,
2271                                          local->hw.conf.channel->center_freq,
2272                                          sband->n_bitrates, supp_rates,
2273                                          capability);
2274 }
2275
2276
2277 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2278                                    struct ieee80211_if_sta *ifsta)
2279 {
2280         struct ieee80211_local *local = sdata->local;
2281         struct ieee80211_bss *bss;
2282         int active_ibss;
2283
2284         if (ifsta->ssid_len == 0)
2285                 return -EINVAL;
2286
2287         active_ibss = ieee80211_sta_active_ibss(sdata);
2288 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2289         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2290                sdata->dev->name, active_ibss);
2291 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2292
2293         if (active_ibss)
2294                 return 0;
2295
2296         if (ifsta->flags & IEEE80211_STA_BSSID_SET)
2297                 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 0,
2298                                            ifsta->ssid, ifsta->ssid_len);
2299         else
2300                 bss = (void *)cfg80211_get_ibss(local->hw.wiphy,
2301                                                 NULL,
2302                                                 ifsta->ssid, ifsta->ssid_len);
2303
2304 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2305         if (bss)
2306                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2307                        "%pM\n", bss->cbss.bssid, ifsta->bssid);
2308 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2309
2310         if (bss &&
2311             (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) ||
2312              memcmp(ifsta->bssid, bss->cbss.bssid, ETH_ALEN))) {
2313                 int ret;
2314
2315                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2316                        " based on configured SSID\n",
2317                        sdata->dev->name, bss->cbss.bssid);
2318
2319                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2320                 ieee80211_rx_bss_put(local, bss);
2321                 return ret;
2322         } else if (bss)
2323                 ieee80211_rx_bss_put(local, bss);
2324
2325 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2326         printk(KERN_DEBUG "   did not try to join ibss\n");
2327 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2328
2329         /* Selected IBSS not found in current scan results - try to scan */
2330         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2331             !ieee80211_sta_active_ibss(sdata)) {
2332                 mod_timer(&ifsta->timer, jiffies +
2333                                       IEEE80211_IBSS_MERGE_INTERVAL);
2334         } else if (time_after(jiffies, local->last_scan_completed +
2335                               IEEE80211_SCAN_INTERVAL)) {
2336                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2337                        "join\n", sdata->dev->name);
2338
2339                 /* XXX maybe racy? */
2340                 if (local->scan_req)
2341                         return -EBUSY;
2342
2343                 memcpy(local->int_scan_req.ssids[0].ssid,
2344                        ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2345                 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2346                 return ieee80211_request_scan(sdata, &local->int_scan_req);
2347         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2348                 int interval = IEEE80211_SCAN_INTERVAL;
2349
2350                 if (time_after(jiffies, ifsta->ibss_join_req +
2351                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2352                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2353                             (!(local->oper_channel->flags &
2354                                         IEEE80211_CHAN_NO_IBSS)))
2355                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2356                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2357                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2358                                        " %d MHz\n", sdata->dev->name,
2359                                        local->hw.conf.channel->center_freq);
2360                         }
2361
2362                         /* No IBSS found - decrease scan interval and continue
2363                          * scanning. */
2364                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2365                 }
2366
2367                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2368                 mod_timer(&ifsta->timer, jiffies + interval);
2369                 return 0;
2370         }
2371
2372         return 0;
2373 }
2374
2375
2376 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2377                                      struct ieee80211_if_sta *ifsta)
2378 {
2379         struct ieee80211_local *local = sdata->local;
2380         struct ieee80211_bss *bss;
2381         u8 *bssid = ifsta->bssid, *ssid = ifsta->ssid;
2382         u8 ssid_len = ifsta->ssid_len;
2383         u16 capa_mask = WLAN_CAPABILITY_ESS;
2384         u16 capa_val = WLAN_CAPABILITY_ESS;
2385         struct ieee80211_channel *chan = local->oper_channel;
2386
2387         if (ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2388                             IEEE80211_STA_AUTO_BSSID_SEL |
2389                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2390                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2391                 if (sdata->default_key)
2392                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2393         }
2394
2395         if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2396                 chan = NULL;
2397
2398         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2399                 bssid = NULL;
2400
2401         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2402                 ssid = NULL;
2403                 ssid_len = 0;
2404         }
2405
2406         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2407                                        bssid, ssid, ssid_len,
2408                                        capa_mask, capa_val);
2409
2410         if (bss) {
2411                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2412                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2413                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2414                                                bss->ssid_len);
2415                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2416                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2417                                                     bss->supp_rates);
2418                 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2419                         sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2420                 else
2421                         sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2422
2423                 /* Send out direct probe if no probe resp was received or
2424                  * the one we have is outdated
2425                  */
2426                 if (!bss->last_probe_resp ||
2427                     time_after(jiffies, bss->last_probe_resp
2428                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2429                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2430                 else
2431                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2432
2433                 ieee80211_rx_bss_put(local, bss);
2434                 ieee80211_sta_reset_auth(sdata, ifsta);
2435                 return 0;
2436         } else {
2437                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2438                         ifsta->assoc_scan_tries++;
2439                         /* XXX maybe racy? */
2440                         if (local->scan_req)
2441                                 return -1;
2442                         memcpy(local->int_scan_req.ssids[0].ssid,
2443                                ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2444                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2445                                 local->int_scan_req.ssids[0].ssid_len = 0;
2446                         else
2447                                 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2448                         ieee80211_start_scan(sdata, &local->int_scan_req);
2449                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2450                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2451                 } else {
2452                         ifsta->assoc_scan_tries = 0;
2453                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2454                 }
2455         }
2456         return -1;
2457 }
2458
2459
2460 static void ieee80211_sta_work(struct work_struct *work)
2461 {
2462         struct ieee80211_sub_if_data *sdata =
2463                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2464         struct ieee80211_local *local = sdata->local;
2465         struct ieee80211_if_sta *ifsta;
2466         struct sk_buff *skb;
2467
2468         if (!netif_running(sdata->dev))
2469                 return;
2470
2471         if (local->sw_scanning || local->hw_scanning)
2472                 return;
2473
2474         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2475                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2476                 return;
2477         ifsta = &sdata->u.sta;
2478
2479         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2480                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2481
2482         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2483             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2484             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2485             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2486                 ieee80211_start_scan(sdata, local->scan_req);
2487                 return;
2488         }
2489
2490         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2491                 if (ieee80211_sta_config_auth(sdata, ifsta))
2492                         return;
2493                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2494         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2495                 return;
2496
2497         switch (ifsta->state) {
2498         case IEEE80211_STA_MLME_DISABLED:
2499                 break;
2500         case IEEE80211_STA_MLME_DIRECT_PROBE:
2501                 ieee80211_direct_probe(sdata, ifsta);
2502                 break;
2503         case IEEE80211_STA_MLME_AUTHENTICATE:
2504                 ieee80211_authenticate(sdata, ifsta);
2505                 break;
2506         case IEEE80211_STA_MLME_ASSOCIATE:
2507                 ieee80211_associate(sdata, ifsta);
2508                 break;
2509         case IEEE80211_STA_MLME_ASSOCIATED:
2510                 ieee80211_associated(sdata, ifsta);
2511                 break;
2512         case IEEE80211_STA_MLME_IBSS_SEARCH:
2513                 ieee80211_sta_find_ibss(sdata, ifsta);
2514                 break;
2515         case IEEE80211_STA_MLME_IBSS_JOINED:
2516                 ieee80211_sta_merge_ibss(sdata, ifsta);
2517                 break;
2518         default:
2519                 WARN_ON(1);
2520                 break;
2521         }
2522
2523         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2524                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2525                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2526
2527                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2528                                         WLAN_REASON_UNSPECIFIED);
2529         }
2530 }
2531
2532 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2533 {
2534         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2535                 queue_work(sdata->local->hw.workqueue,
2536                            &sdata->u.sta.work);
2537 }
2538
2539 /* interface setup */
2540 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2541 {
2542         struct ieee80211_if_sta *ifsta;
2543
2544         ifsta = &sdata->u.sta;
2545         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2546         INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2547         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2548                     (unsigned long) sdata);
2549         setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2550                     (unsigned long) sdata);
2551         skb_queue_head_init(&ifsta->skb_queue);
2552
2553         ifsta->capab = WLAN_CAPABILITY_ESS;
2554         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2555                 IEEE80211_AUTH_ALG_SHARED_KEY;
2556         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2557                 IEEE80211_STA_AUTO_BSSID_SEL |
2558                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2559         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2560                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2561 }
2562
2563 /*
2564  * Add a new IBSS station, will also be called by the RX code when,
2565  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2566  * must be callable in atomic context.
2567  */
2568 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2569                                         u8 *bssid,u8 *addr, u32 supp_rates)
2570 {
2571         struct ieee80211_local *local = sdata->local;
2572         struct sta_info *sta;
2573         int band = local->hw.conf.channel->band;
2574
2575         /* TODO: Could consider removing the least recently used entry and
2576          * allow new one to be added. */
2577         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2578                 if (net_ratelimit()) {
2579                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2580                                "entry %pM\n", sdata->dev->name, addr);
2581                 }
2582                 return NULL;
2583         }
2584
2585         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2586                 return NULL;
2587
2588 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2589         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2590                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2591 #endif
2592
2593         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2594         if (!sta)
2595                 return NULL;
2596
2597         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2598
2599         /* make sure mandatory rates are always added */
2600         sta->sta.supp_rates[band] = supp_rates |
2601                         ieee80211_mandatory_rates(local, band);
2602
2603         rate_control_rate_init(sta);
2604
2605         if (sta_info_insert(sta))
2606                 return NULL;
2607
2608         return sta;
2609 }
2610
2611 /* configuration hooks */
2612 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2613                             struct ieee80211_if_sta *ifsta)
2614 {
2615         struct ieee80211_local *local = sdata->local;
2616
2617         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2618                 return;
2619
2620         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2621                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2622             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2623                              IEEE80211_STA_AUTO_SSID_SEL))) {
2624
2625                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2626                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2627                                                WLAN_REASON_DEAUTH_LEAVING);
2628
2629                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2630                 queue_work(local->hw.workqueue, &ifsta->work);
2631         }
2632 }
2633
2634 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2635 {
2636         struct ieee80211_if_sta *ifsta;
2637
2638         if (len > IEEE80211_MAX_SSID_LEN)
2639                 return -EINVAL;
2640
2641         ifsta = &sdata->u.sta;
2642
2643         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2644                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2645                 memcpy(ifsta->ssid, ssid, len);
2646                 ifsta->ssid_len = len;
2647         }
2648
2649         ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2650
2651         if (len)
2652                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2653         else
2654                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2655
2656         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2657                 ifsta->ibss_join_req = jiffies;
2658                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2659                 return ieee80211_sta_find_ibss(sdata, ifsta);
2660         }
2661
2662         return 0;
2663 }
2664
2665 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2666 {
2667         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2668         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2669         *len = ifsta->ssid_len;
2670         return 0;
2671 }
2672
2673 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2674 {
2675         struct ieee80211_if_sta *ifsta;
2676
2677         ifsta = &sdata->u.sta;
2678
2679         if (is_valid_ether_addr(bssid)) {
2680                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2681                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2682         } else {
2683                 memset(ifsta->bssid, 0, ETH_ALEN);
2684                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2685         }
2686
2687         if (netif_running(sdata->dev)) {
2688                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2689                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2690                                "the low-level driver\n", sdata->dev->name);
2691                 }
2692         }
2693
2694         return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
2695 }
2696
2697 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2698 {
2699         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2700
2701         kfree(ifsta->extra_ie);
2702         if (len == 0) {
2703                 ifsta->extra_ie = NULL;
2704                 ifsta->extra_ie_len = 0;
2705                 return 0;
2706         }
2707         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2708         if (!ifsta->extra_ie) {
2709                 ifsta->extra_ie_len = 0;
2710                 return -ENOMEM;
2711         }
2712         memcpy(ifsta->extra_ie, ie, len);
2713         ifsta->extra_ie_len = len;
2714         return 0;
2715 }
2716
2717 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2718 {
2719         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2720
2721         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2722                sdata->dev->name, reason);
2723
2724         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2725             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2726                 return -EINVAL;
2727
2728         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2729         return 0;
2730 }
2731
2732 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2733 {
2734         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2735
2736         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2737                sdata->dev->name, reason);
2738
2739         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2740                 return -EINVAL;
2741
2742         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2743                 return -1;
2744
2745         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2746         return 0;
2747 }
2748
2749 /* scan finished notification */
2750 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2751 {
2752         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2753         struct ieee80211_if_sta *ifsta;
2754
2755         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2756                 ifsta = &sdata->u.sta;
2757                 if ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2758                     !ieee80211_sta_active_ibss(sdata))
2759                         ieee80211_sta_find_ibss(sdata, ifsta);
2760         }
2761
2762         /* Restart STA timers */
2763         rcu_read_lock();
2764         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2765                 ieee80211_restart_sta_timer(sdata);
2766         rcu_read_unlock();
2767 }
2768
2769 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2770 {
2771         struct ieee80211_local *local =
2772                 container_of(work, struct ieee80211_local,
2773                              dynamic_ps_disable_work);
2774
2775         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2776                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2777                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2778         }
2779
2780         ieee80211_wake_queues_by_reason(&local->hw,
2781                                         IEEE80211_QUEUE_STOP_REASON_PS);
2782 }
2783
2784 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2785 {
2786         struct ieee80211_local *local =
2787                 container_of(work, struct ieee80211_local,
2788                              dynamic_ps_enable_work);
2789         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2790
2791         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2792                 return;
2793
2794         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2795                 ieee80211_send_nullfunc(local, sdata, 1);
2796
2797         local->hw.conf.flags |= IEEE80211_CONF_PS;
2798         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2799 }
2800
2801 void ieee80211_dynamic_ps_timer(unsigned long data)
2802 {
2803         struct ieee80211_local *local = (void *) data;
2804
2805         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2806 }