SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/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         }
1209
1210         if (auth_alg != ifsta->auth_alg ||
1211             auth_transaction != ifsta->auth_transaction)
1212                 return;
1213
1214         if (status_code != WLAN_STATUS_SUCCESS) {
1215                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1216                         u8 algs[3];
1217                         const int num_algs = ARRAY_SIZE(algs);
1218                         int i, pos;
1219                         algs[0] = algs[1] = algs[2] = 0xff;
1220                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1221                                 algs[0] = WLAN_AUTH_OPEN;
1222                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1223                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1224                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1225                                 algs[2] = WLAN_AUTH_LEAP;
1226                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1227                                 pos = 0;
1228                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1229                                 pos = 1;
1230                         else
1231                                 pos = 2;
1232                         for (i = 0; i < num_algs; i++) {
1233                                 pos++;
1234                                 if (pos >= num_algs)
1235                                         pos = 0;
1236                                 if (algs[pos] == ifsta->auth_alg ||
1237                                     algs[pos] == 0xff)
1238                                         continue;
1239                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1240                                     !ieee80211_sta_wep_configured(sdata))
1241                                         continue;
1242                                 ifsta->auth_alg = algs[pos];
1243                                 break;
1244                         }
1245                 }
1246                 return;
1247         }
1248
1249         switch (ifsta->auth_alg) {
1250         case WLAN_AUTH_OPEN:
1251         case WLAN_AUTH_LEAP:
1252                 ieee80211_auth_completed(sdata, ifsta);
1253                 break;
1254         case WLAN_AUTH_SHARED_KEY:
1255                 if (ifsta->auth_transaction == 4)
1256                         ieee80211_auth_completed(sdata, ifsta);
1257                 else
1258                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1259                 break;
1260         }
1261 }
1262
1263
1264 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1265                                      struct ieee80211_if_sta *ifsta,
1266                                      struct ieee80211_mgmt *mgmt,
1267                                      size_t len)
1268 {
1269         u16 reason_code;
1270
1271         if (len < 24 + 2)
1272                 return;
1273
1274         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1275                 return;
1276
1277         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1278
1279         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1280                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1281                                 sdata->dev->name, reason_code);
1282
1283         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1284             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1285             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1286                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1287                 mod_timer(&ifsta->timer, jiffies +
1288                                       IEEE80211_RETRY_AUTH_INTERVAL);
1289         }
1290
1291         ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1292         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1293 }
1294
1295
1296 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1297                                        struct ieee80211_if_sta *ifsta,
1298                                        struct ieee80211_mgmt *mgmt,
1299                                        size_t len)
1300 {
1301         u16 reason_code;
1302
1303         if (len < 24 + 2)
1304                 return;
1305
1306         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1307                 return;
1308
1309         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1310
1311         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1312                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1313                                 sdata->dev->name, reason_code);
1314
1315         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1316                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1317                 mod_timer(&ifsta->timer, jiffies +
1318                                       IEEE80211_RETRY_AUTH_INTERVAL);
1319         }
1320
1321         ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code);
1322 }
1323
1324
1325 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1326                                          struct ieee80211_if_sta *ifsta,
1327                                          struct ieee80211_mgmt *mgmt,
1328                                          size_t len,
1329                                          int reassoc)
1330 {
1331         struct ieee80211_local *local = sdata->local;
1332         struct ieee80211_supported_band *sband;
1333         struct sta_info *sta;
1334         u32 rates, basic_rates;
1335         u16 capab_info, status_code, aid;
1336         struct ieee802_11_elems elems;
1337         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1338         u8 *pos;
1339         u32 changed = 0;
1340         int i, j;
1341         bool have_higher_than_11mbit = false, newsta = false;
1342         u16 ap_ht_cap_flags;
1343
1344         /* AssocResp and ReassocResp have identical structure, so process both
1345          * of them in this function. */
1346
1347         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1348                 return;
1349
1350         if (len < 24 + 6)
1351                 return;
1352
1353         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1354                 return;
1355
1356         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1357         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1358         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1359
1360         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1361                "status=%d aid=%d)\n",
1362                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1363                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1364
1365         pos = mgmt->u.assoc_resp.variable;
1366         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1367
1368         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1369             elems.timeout_int && elems.timeout_int_len == 5 &&
1370             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1371                 u32 tu, ms;
1372                 tu = get_unaligned_le32(elems.timeout_int + 1);
1373                 ms = tu * 1024 / 1000;
1374                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1375                        "comeback duration %u TU (%u ms)\n",
1376                        sdata->dev->name, tu, ms);
1377                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1378                         mod_timer(&ifsta->timer,
1379                                   jiffies + msecs_to_jiffies(ms));
1380                 return;
1381         }
1382
1383         if (status_code != WLAN_STATUS_SUCCESS) {
1384                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1385                        sdata->dev->name, status_code);
1386                 /* if this was a reassociation, ensure we try a "full"
1387                  * association next time. This works around some broken APs
1388                  * which do not correctly reject reassociation requests. */
1389                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1390                 return;
1391         }
1392
1393         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1394                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1395                        "set\n", sdata->dev->name, aid);
1396         aid &= ~(BIT(15) | BIT(14));
1397
1398         if (!elems.supp_rates) {
1399                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1400                        sdata->dev->name);
1401                 return;
1402         }
1403
1404         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1405         ifsta->aid = aid;
1406         ifsta->ap_capab = capab_info;
1407
1408         kfree(ifsta->assocresp_ies);
1409         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1410         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1411         if (ifsta->assocresp_ies)
1412                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1413
1414         rcu_read_lock();
1415
1416         /* Add STA entry for the AP */
1417         sta = sta_info_get(local, ifsta->bssid);
1418         if (!sta) {
1419                 newsta = true;
1420
1421                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1422                 if (!sta) {
1423                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1424                                " the AP\n", sdata->dev->name);
1425                         rcu_read_unlock();
1426                         return;
1427                 }
1428
1429                 /* update new sta with its last rx activity */
1430                 sta->last_rx = jiffies;
1431         }
1432
1433         /*
1434          * FIXME: Do we really need to update the sta_info's information here?
1435          *        We already know about the AP (we found it in our list) so it
1436          *        should already be filled with the right info, no?
1437          *        As is stands, all this is racy because typically we assume
1438          *        the information that is filled in here (except flags) doesn't
1439          *        change while a STA structure is alive. As such, it should move
1440          *        to between the sta_info_alloc() and sta_info_insert() above.
1441          */
1442
1443         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1444                            WLAN_STA_AUTHORIZED);
1445
1446         rates = 0;
1447         basic_rates = 0;
1448         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1449
1450         for (i = 0; i < elems.supp_rates_len; i++) {
1451                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1452                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1453
1454                 if (rate > 110)
1455                         have_higher_than_11mbit = true;
1456
1457                 for (j = 0; j < sband->n_bitrates; j++) {
1458                         if (sband->bitrates[j].bitrate == rate) {
1459                                 rates |= BIT(j);
1460                                 if (is_basic)
1461                                         basic_rates |= BIT(j);
1462                                 break;
1463                         }
1464                 }
1465         }
1466
1467         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1468                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1469                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1470
1471                 if (rate > 110)
1472                         have_higher_than_11mbit = true;
1473
1474                 for (j = 0; j < sband->n_bitrates; j++) {
1475                         if (sband->bitrates[j].bitrate == rate) {
1476                                 rates |= BIT(j);
1477                                 if (is_basic)
1478                                         basic_rates |= BIT(j);
1479                                 break;
1480                         }
1481                 }
1482         }
1483
1484         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1485         sdata->vif.bss_conf.basic_rates = basic_rates;
1486
1487         /* cf. IEEE 802.11 9.2.12 */
1488         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1489             have_higher_than_11mbit)
1490                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1491         else
1492                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1493
1494         if (elems.ht_cap_elem)
1495                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1496                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1497
1498         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1499
1500         rate_control_rate_init(sta);
1501
1502         if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
1503                 set_sta_flags(sta, WLAN_STA_MFP);
1504
1505         if (elems.wmm_param)
1506                 set_sta_flags(sta, WLAN_STA_WME);
1507
1508         if (newsta) {
1509                 int err = sta_info_insert(sta);
1510                 if (err) {
1511                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1512                                " the AP (error %d)\n", sdata->dev->name, err);
1513                         rcu_read_unlock();
1514                         return;
1515                 }
1516         }
1517
1518         rcu_read_unlock();
1519
1520         if (elems.wmm_param)
1521                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1522                                          elems.wmm_param_len);
1523
1524         if (elems.ht_info_elem && elems.wmm_param &&
1525             (ifsta->flags & IEEE80211_STA_WMM_ENABLED))
1526                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1527                                                ap_ht_cap_flags);
1528
1529         /* set AID and assoc capability,
1530          * ieee80211_set_associated() will tell the driver */
1531         bss_conf->aid = aid;
1532         bss_conf->assoc_capability = capab_info;
1533         ieee80211_set_associated(sdata, ifsta, changed);
1534
1535         ieee80211_associated(sdata, ifsta);
1536 }
1537
1538
1539 static int __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1540                                      struct ieee80211_if_sta *ifsta,
1541                                      const u8 *bssid, const int beacon_int,
1542                                      const int freq,
1543                                      const size_t supp_rates_len,
1544                                      const u8 *supp_rates,
1545                                      const u16 capability)
1546 {
1547         struct ieee80211_local *local = sdata->local;
1548         int res = 0, rates, i, j;
1549         struct sk_buff *skb;
1550         struct ieee80211_mgmt *mgmt;
1551         u8 *pos;
1552         struct ieee80211_supported_band *sband;
1553         union iwreq_data wrqu;
1554
1555         if (local->ops->reset_tsf) {
1556                 /* Reset own TSF to allow time synchronization work. */
1557                 local->ops->reset_tsf(local_to_hw(local));
1558         }
1559
1560         if ((ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) &&
1561            memcmp(ifsta->bssid, bssid, ETH_ALEN) == 0)
1562                 return res;
1563
1564         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
1565                             sdata->u.sta.ie_proberesp_len);
1566         if (!skb) {
1567                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1568                        "response\n", sdata->dev->name);
1569                 return -ENOMEM;
1570         }
1571
1572         if (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) {
1573                 /* Remove possible STA entries from other IBSS networks. */
1574                 sta_info_flush_delayed(sdata);
1575         }
1576
1577         memcpy(ifsta->bssid, bssid, ETH_ALEN);
1578         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
1579         if (res)
1580                 return res;
1581
1582         local->hw.conf.beacon_int = beacon_int >= 10 ? beacon_int : 10;
1583
1584         sdata->drop_unencrypted = capability &
1585                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
1586
1587         res = ieee80211_set_freq(sdata, freq);
1588
1589         if (res)
1590                 return res;
1591
1592         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1593
1594         /* Build IBSS probe response */
1595
1596         skb_reserve(skb, local->hw.extra_tx_headroom);
1597
1598         mgmt = (struct ieee80211_mgmt *)
1599                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
1600         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
1601         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1602                                           IEEE80211_STYPE_PROBE_RESP);
1603         memset(mgmt->da, 0xff, ETH_ALEN);
1604         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1605         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1606         mgmt->u.beacon.beacon_int =
1607                 cpu_to_le16(local->hw.conf.beacon_int);
1608         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
1609
1610         pos = skb_put(skb, 2 + ifsta->ssid_len);
1611         *pos++ = WLAN_EID_SSID;
1612         *pos++ = ifsta->ssid_len;
1613         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
1614
1615         rates = supp_rates_len;
1616         if (rates > 8)
1617                 rates = 8;
1618         pos = skb_put(skb, 2 + rates);
1619         *pos++ = WLAN_EID_SUPP_RATES;
1620         *pos++ = rates;
1621         memcpy(pos, supp_rates, rates);
1622
1623         if (sband->band == IEEE80211_BAND_2GHZ) {
1624                 pos = skb_put(skb, 2 + 1);
1625                 *pos++ = WLAN_EID_DS_PARAMS;
1626                 *pos++ = 1;
1627                 *pos++ = ieee80211_frequency_to_channel(freq);
1628         }
1629
1630         pos = skb_put(skb, 2 + 2);
1631         *pos++ = WLAN_EID_IBSS_PARAMS;
1632         *pos++ = 2;
1633         /* FIX: set ATIM window based on scan results */
1634         *pos++ = 0;
1635         *pos++ = 0;
1636
1637         if (supp_rates_len > 8) {
1638                 rates = supp_rates_len - 8;
1639                 pos = skb_put(skb, 2 + rates);
1640                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1641                 *pos++ = rates;
1642                 memcpy(pos, &supp_rates[8], rates);
1643         }
1644
1645         add_extra_ies(skb, sdata->u.sta.ie_proberesp,
1646                       sdata->u.sta.ie_proberesp_len);
1647
1648         ifsta->probe_resp = skb;
1649
1650         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
1651                                    IEEE80211_IFCC_BEACON_ENABLED);
1652
1653
1654         rates = 0;
1655         for (i = 0; i < supp_rates_len; i++) {
1656                 int bitrate = (supp_rates[i] & 0x7f) * 5;
1657                 for (j = 0; j < sband->n_bitrates; j++)
1658                         if (sband->bitrates[j].bitrate == bitrate)
1659                                 rates |= BIT(j);
1660         }
1661         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
1662
1663         ieee80211_sta_def_wmm_params(sdata, supp_rates_len, supp_rates);
1664
1665         ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
1666         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
1667         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1668
1669         ieee80211_led_assoc(local, true);
1670
1671         memset(&wrqu, 0, sizeof(wrqu));
1672         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
1673         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
1674
1675         return res;
1676 }
1677
1678 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
1679                                    struct ieee80211_if_sta *ifsta,
1680                                    struct ieee80211_bss *bss)
1681 {
1682         return __ieee80211_sta_join_ibss(sdata, ifsta,
1683                                          bss->cbss.bssid,
1684                                          bss->cbss.beacon_interval,
1685                                          bss->cbss.channel->center_freq,
1686                                          bss->supp_rates_len, bss->supp_rates,
1687                                          bss->cbss.capability);
1688 }
1689
1690 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1691                                   struct ieee80211_mgmt *mgmt,
1692                                   size_t len,
1693                                   struct ieee80211_rx_status *rx_status,
1694                                   struct ieee802_11_elems *elems,
1695                                   bool beacon)
1696 {
1697         struct ieee80211_local *local = sdata->local;
1698         int freq;
1699         struct ieee80211_bss *bss;
1700         struct sta_info *sta;
1701         struct ieee80211_channel *channel;
1702         u64 beacon_timestamp, rx_timestamp;
1703         u32 supp_rates = 0;
1704         enum ieee80211_band band = rx_status->band;
1705
1706         if (elems->ds_params && elems->ds_params_len == 1)
1707                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1708         else
1709                 freq = rx_status->freq;
1710
1711         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1712
1713         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1714                 return;
1715
1716         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates &&
1717             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1718                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
1719
1720                 rcu_read_lock();
1721
1722                 sta = sta_info_get(local, mgmt->sa);
1723                 if (sta) {
1724                         u32 prev_rates;
1725
1726                         prev_rates = sta->sta.supp_rates[band];
1727                         /* make sure mandatory rates are always added */
1728                         sta->sta.supp_rates[band] = supp_rates |
1729                                 ieee80211_mandatory_rates(local, band);
1730
1731 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1732                         if (sta->sta.supp_rates[band] != prev_rates)
1733                                 printk(KERN_DEBUG "%s: updated supp_rates set "
1734                                     "for %pM based on beacon info (0x%llx | "
1735                                     "0x%llx -> 0x%llx)\n",
1736                                     sdata->dev->name,
1737                                     sta->sta.addr,
1738                                     (unsigned long long) prev_rates,
1739                                     (unsigned long long) supp_rates,
1740                                     (unsigned long long) sta->sta.supp_rates[band]);
1741 #endif
1742                 } else {
1743                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1744                 }
1745
1746                 rcu_read_unlock();
1747         }
1748
1749         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1750                                         channel, beacon);
1751         if (!bss)
1752                 return;
1753
1754         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1755             (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
1756                 struct ieee80211_channel_sw_ie *sw_elem =
1757                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1758                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1759         }
1760
1761         /* was just updated in ieee80211_bss_info_update */
1762         beacon_timestamp = bss->cbss.tsf;
1763
1764         /*
1765          * In STA mode, the remaining parameters should not be overridden
1766          * by beacons because they're not necessarily accurate there.
1767          */
1768         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1769             bss->last_probe_resp && beacon) {
1770                 ieee80211_rx_bss_put(local, bss);
1771                 return;
1772         }
1773
1774         /* check if we need to merge IBSS */
1775         if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
1776             (!(sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)) &&
1777             bss->cbss.capability & WLAN_CAPABILITY_IBSS &&
1778             bss->cbss.channel == local->oper_channel &&
1779             elems->ssid_len == sdata->u.sta.ssid_len &&
1780             memcmp(elems->ssid, sdata->u.sta.ssid,
1781                                 sdata->u.sta.ssid_len) == 0) {
1782                 if (rx_status->flag & RX_FLAG_TSFT) {
1783                         /* in order for correct IBSS merging we need mactime
1784                          *
1785                          * since mactime is defined as the time the first data
1786                          * symbol of the frame hits the PHY, and the timestamp
1787                          * of the beacon is defined as "the time that the data
1788                          * symbol containing the first bit of the timestamp is
1789                          * transmitted to the PHY plus the transmitting STA’s
1790                          * delays through its local PHY from the MAC-PHY
1791                          * interface to its interface with the WM"
1792                          * (802.11 11.1.2) - equals the time this bit arrives at
1793                          * the receiver - we have to take into account the
1794                          * offset between the two.
1795                          * e.g: at 1 MBit that means mactime is 192 usec earlier
1796                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
1797                          */
1798                         int rate;
1799                         if (rx_status->flag & RX_FLAG_HT) {
1800                                 rate = 65; /* TODO: HT rates */
1801                         } else {
1802                                 rate = local->hw.wiphy->bands[band]->
1803                                         bitrates[rx_status->rate_idx].bitrate;
1804                         }
1805                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
1806                 } else if (local && local->ops && local->ops->get_tsf)
1807                         /* second best option: get current TSF */
1808                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
1809                 else
1810                         /* can't merge without knowing the TSF */
1811                         rx_timestamp = -1LLU;
1812 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1813                 printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
1814                        "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
1815                        mgmt->sa, mgmt->bssid,
1816                        (unsigned long long)rx_timestamp,
1817                        (unsigned long long)beacon_timestamp,
1818                        (unsigned long long)(rx_timestamp - beacon_timestamp),
1819                        jiffies);
1820 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1821                 if (beacon_timestamp > rx_timestamp) {
1822 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1823                         printk(KERN_DEBUG "%s: beacon TSF higher than "
1824                                "local TSF - IBSS merge with BSSID %pM\n",
1825                                sdata->dev->name, mgmt->bssid);
1826 #endif
1827                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
1828                         ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
1829                 }
1830         }
1831
1832         ieee80211_rx_bss_put(local, bss);
1833 }
1834
1835
1836 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1837                                          struct ieee80211_mgmt *mgmt,
1838                                          size_t len,
1839                                          struct ieee80211_rx_status *rx_status)
1840 {
1841         size_t baselen;
1842         struct ieee802_11_elems elems;
1843         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1844
1845         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1846                 return; /* ignore ProbeResp to foreign address */
1847
1848         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1849         if (baselen > len)
1850                 return;
1851
1852         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1853                                 &elems);
1854
1855         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1856
1857         /* direct probe may be part of the association flow */
1858         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1859                                                         &ifsta->request)) {
1860                 printk(KERN_DEBUG "%s direct probe responded\n",
1861                        sdata->dev->name);
1862                 ieee80211_authenticate(sdata, ifsta);
1863         }
1864 }
1865
1866
1867 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1868                                      struct ieee80211_mgmt *mgmt,
1869                                      size_t len,
1870                                      struct ieee80211_rx_status *rx_status)
1871 {
1872         struct ieee80211_if_sta *ifsta;
1873         size_t baselen;
1874         struct ieee802_11_elems elems;
1875         struct ieee80211_local *local = sdata->local;
1876         u32 changed = 0;
1877         bool erp_valid, directed_tim;
1878         u8 erp_value = 0;
1879
1880         /* Process beacon from the current BSS */
1881         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1882         if (baselen > len)
1883                 return;
1884
1885         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1886
1887         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1888
1889         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1890                 return;
1891         ifsta = &sdata->u.sta;
1892
1893         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1894             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1895                 return;
1896
1897         if (rx_status->freq != local->hw.conf.channel->center_freq)
1898                 return;
1899
1900         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
1901                                  elems.wmm_param_len);
1902
1903         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
1904             local->hw.conf.flags & IEEE80211_CONF_PS) {
1905                 directed_tim = ieee80211_check_tim(&elems, ifsta->aid);
1906
1907                 if (directed_tim) {
1908                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1909                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1910                                 ieee80211_hw_config(local,
1911                                                     IEEE80211_CONF_CHANGE_PS);
1912                                 ieee80211_send_nullfunc(local, sdata, 0);
1913                         } else {
1914                                 local->pspolling = true;
1915
1916                                 /*
1917                                  * Here is assumed that the driver will be
1918                                  * able to send ps-poll frame and receive a
1919                                  * response even though power save mode is
1920                                  * enabled, but some drivers might require
1921                                  * to disable power save here. This needs
1922                                  * to be investigated.
1923                                  */
1924                                 ieee80211_send_pspoll(local, sdata);
1925                         }
1926                 }
1927         }
1928
1929         if (elems.erp_info && elems.erp_info_len >= 1) {
1930                 erp_valid = true;
1931                 erp_value = elems.erp_info[0];
1932         } else {
1933                 erp_valid = false;
1934         }
1935         changed |= ieee80211_handle_bss_capability(sdata,
1936                         le16_to_cpu(mgmt->u.beacon.capab_info),
1937                         erp_valid, erp_value);
1938
1939
1940         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) {
1941                 struct sta_info *sta;
1942                 struct ieee80211_supported_band *sband;
1943                 u16 ap_ht_cap_flags;
1944
1945                 rcu_read_lock();
1946
1947                 sta = sta_info_get(local, ifsta->bssid);
1948                 if (!sta) {
1949                         rcu_read_unlock();
1950                         return;
1951                 }
1952
1953                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1954
1955                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1956                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1957
1958                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1959
1960                 rcu_read_unlock();
1961
1962                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1963                                                ap_ht_cap_flags);
1964         }
1965
1966         if (elems.country_elem) {
1967                 /* Note we are only reviewing this on beacons
1968                  * for the BSSID we are associated to */
1969                 regulatory_hint_11d(local->hw.wiphy,
1970                         elems.country_elem, elems.country_elem_len);
1971
1972                 /* TODO: IBSS also needs this */
1973                 if (elems.pwr_constr_elem)
1974                         ieee80211_handle_pwr_constr(sdata,
1975                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1976                                 elems.pwr_constr_elem,
1977                                 elems.pwr_constr_elem_len);
1978         }
1979
1980         ieee80211_bss_info_change_notify(sdata, changed);
1981 }
1982
1983
1984 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1985                                         struct ieee80211_if_sta *ifsta,
1986                                         struct ieee80211_mgmt *mgmt,
1987                                         size_t len)
1988 {
1989         struct ieee80211_local *local = sdata->local;
1990         int tx_last_beacon;
1991         struct sk_buff *skb;
1992         struct ieee80211_mgmt *resp;
1993         u8 *pos, *end;
1994
1995         if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
1996             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
1997             len < 24 + 2 || !ifsta->probe_resp)
1998                 return;
1999
2000         if (local->ops->tx_last_beacon)
2001                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2002         else
2003                 tx_last_beacon = 1;
2004
2005 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2006         printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM"
2007                " (tx_last_beacon=%d)\n",
2008                sdata->dev->name, mgmt->sa, mgmt->da,
2009                mgmt->bssid, tx_last_beacon);
2010 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2011
2012         if (!tx_last_beacon)
2013                 return;
2014
2015         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2016             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2017                 return;
2018
2019         end = ((u8 *) mgmt) + len;
2020         pos = mgmt->u.probe_req.variable;
2021         if (pos[0] != WLAN_EID_SSID ||
2022             pos + 2 + pos[1] > end) {
2023 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2024                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2025                        "from %pM\n",
2026                        sdata->dev->name, mgmt->sa);
2027 #endif
2028                 return;
2029         }
2030         if (pos[1] != 0 &&
2031             (pos[1] != ifsta->ssid_len ||
2032              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2033                 /* Ignore ProbeReq for foreign SSID */
2034                 return;
2035         }
2036
2037         /* Reply with ProbeResp */
2038         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2039         if (!skb)
2040                 return;
2041
2042         resp = (struct ieee80211_mgmt *) skb->data;
2043         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2044 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2045         printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n",
2046                sdata->dev->name, resp->da);
2047 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2048         ieee80211_tx_skb(sdata, skb, 0);
2049 }
2050
2051 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
2052                            struct ieee80211_rx_status *rx_status)
2053 {
2054         struct ieee80211_local *local = sdata->local;
2055         struct ieee80211_if_sta *ifsta;
2056         struct ieee80211_mgmt *mgmt;
2057         u16 fc;
2058
2059         if (skb->len < 24)
2060                 goto fail;
2061
2062         ifsta = &sdata->u.sta;
2063
2064         mgmt = (struct ieee80211_mgmt *) skb->data;
2065         fc = le16_to_cpu(mgmt->frame_control);
2066
2067         switch (fc & IEEE80211_FCTL_STYPE) {
2068         case IEEE80211_STYPE_PROBE_REQ:
2069         case IEEE80211_STYPE_PROBE_RESP:
2070         case IEEE80211_STYPE_BEACON:
2071                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2072         case IEEE80211_STYPE_AUTH:
2073         case IEEE80211_STYPE_ASSOC_RESP:
2074         case IEEE80211_STYPE_REASSOC_RESP:
2075         case IEEE80211_STYPE_DEAUTH:
2076         case IEEE80211_STYPE_DISASSOC:
2077                 skb_queue_tail(&ifsta->skb_queue, skb);
2078                 queue_work(local->hw.workqueue, &ifsta->work);
2079                 return;
2080         }
2081
2082  fail:
2083         kfree_skb(skb);
2084 }
2085
2086 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2087                                          struct sk_buff *skb)
2088 {
2089         struct ieee80211_rx_status *rx_status;
2090         struct ieee80211_if_sta *ifsta;
2091         struct ieee80211_mgmt *mgmt;
2092         u16 fc;
2093
2094         ifsta = &sdata->u.sta;
2095
2096         rx_status = (struct ieee80211_rx_status *) skb->cb;
2097         mgmt = (struct ieee80211_mgmt *) skb->data;
2098         fc = le16_to_cpu(mgmt->frame_control);
2099
2100         switch (fc & IEEE80211_FCTL_STYPE) {
2101         case IEEE80211_STYPE_PROBE_REQ:
2102                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len);
2103                 break;
2104         case IEEE80211_STYPE_PROBE_RESP:
2105                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
2106                 break;
2107         case IEEE80211_STYPE_BEACON:
2108                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2109                 break;
2110         case IEEE80211_STYPE_AUTH:
2111                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
2112                 break;
2113         case IEEE80211_STYPE_ASSOC_RESP:
2114                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2115                 break;
2116         case IEEE80211_STYPE_REASSOC_RESP:
2117                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2118                 break;
2119         case IEEE80211_STYPE_DEAUTH:
2120                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
2121                 break;
2122         case IEEE80211_STYPE_DISASSOC:
2123                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
2124                 break;
2125         }
2126
2127         kfree_skb(skb);
2128 }
2129
2130
2131 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
2132 {
2133         struct ieee80211_local *local = sdata->local;
2134         int active = 0;
2135         struct sta_info *sta;
2136
2137         rcu_read_lock();
2138
2139         list_for_each_entry_rcu(sta, &local->sta_list, list) {
2140                 if (sta->sdata == sdata &&
2141                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2142                                jiffies)) {
2143                         active++;
2144                         break;
2145                 }
2146         }
2147
2148         rcu_read_unlock();
2149
2150         return active;
2151 }
2152
2153
2154 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
2155                                      struct ieee80211_if_sta *ifsta)
2156 {
2157         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2158
2159         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
2160         if (ieee80211_sta_active_ibss(sdata))
2161                 return;
2162
2163         if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
2164             (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
2165                 return;
2166
2167         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2168                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
2169
2170         /* XXX maybe racy? */
2171         if (sdata->local->scan_req)
2172                 return;
2173
2174         memcpy(sdata->local->int_scan_req.ssids[0].ssid,
2175                ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2176         sdata->local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2177         ieee80211_request_scan(sdata, &sdata->local->int_scan_req);
2178 }
2179
2180
2181 static void ieee80211_sta_timer(unsigned long data)
2182 {
2183         struct ieee80211_sub_if_data *sdata =
2184                 (struct ieee80211_sub_if_data *) data;
2185         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2186         struct ieee80211_local *local = sdata->local;
2187
2188         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2189         queue_work(local->hw.workqueue, &ifsta->work);
2190 }
2191
2192 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
2193                                      struct ieee80211_if_sta *ifsta)
2194 {
2195         struct ieee80211_local *local = sdata->local;
2196
2197         if (local->ops->reset_tsf) {
2198                 /* Reset own TSF to allow time synchronization work. */
2199                 local->ops->reset_tsf(local_to_hw(local));
2200         }
2201
2202         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2203
2204
2205         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2206                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2207         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2208                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2209         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2210                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2211         else
2212                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2213         ifsta->auth_transaction = -1;
2214         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2215         ifsta->assoc_scan_tries = 0;
2216         ifsta->direct_probe_tries = 0;
2217         ifsta->auth_tries = 0;
2218         ifsta->assoc_tries = 0;
2219         netif_tx_stop_all_queues(sdata->dev);
2220         netif_carrier_off(sdata->dev);
2221 }
2222
2223 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
2224                                      struct ieee80211_if_sta *ifsta)
2225 {
2226         struct ieee80211_local *local = sdata->local;
2227         struct ieee80211_supported_band *sband;
2228         u8 *pos;
2229         u8 bssid[ETH_ALEN];
2230         u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
2231         u16 capability;
2232         int i;
2233
2234         if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
2235                 memcpy(bssid, ifsta->bssid, ETH_ALEN);
2236         } else {
2237                 /* Generate random, not broadcast, locally administered BSSID. Mix in
2238                  * own MAC address to make sure that devices that do not have proper
2239                  * random number generator get different BSSID. */
2240                 get_random_bytes(bssid, ETH_ALEN);
2241                 for (i = 0; i < ETH_ALEN; i++)
2242                         bssid[i] ^= sdata->dev->dev_addr[i];
2243                 bssid[0] &= ~0x01;
2244                 bssid[0] |= 0x02;
2245         }
2246
2247         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
2248                sdata->dev->name, bssid);
2249
2250         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2251
2252         if (local->hw.conf.beacon_int == 0)
2253                 local->hw.conf.beacon_int = 100;
2254
2255         capability = WLAN_CAPABILITY_IBSS;
2256
2257         if (sdata->default_key)
2258                 capability |= WLAN_CAPABILITY_PRIVACY;
2259         else
2260                 sdata->drop_unencrypted = 0;
2261
2262         pos = supp_rates;
2263         for (i = 0; i < sband->n_bitrates; i++) {
2264                 int rate = sband->bitrates[i].bitrate;
2265                 *pos++ = (u8) (rate / 5);
2266         }
2267
2268         return __ieee80211_sta_join_ibss(sdata, ifsta,
2269                                          bssid, local->hw.conf.beacon_int,
2270                                          local->hw.conf.channel->center_freq,
2271                                          sband->n_bitrates, supp_rates,
2272                                          capability);
2273 }
2274
2275
2276 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
2277                                    struct ieee80211_if_sta *ifsta)
2278 {
2279         struct ieee80211_local *local = sdata->local;
2280         struct ieee80211_bss *bss;
2281         int active_ibss;
2282
2283         if (ifsta->ssid_len == 0)
2284                 return -EINVAL;
2285
2286         active_ibss = ieee80211_sta_active_ibss(sdata);
2287 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2288         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2289                sdata->dev->name, active_ibss);
2290 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2291
2292         if (active_ibss)
2293                 return 0;
2294
2295         if (ifsta->flags & IEEE80211_STA_BSSID_SET)
2296                 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 0,
2297                                            ifsta->ssid, ifsta->ssid_len);
2298         else
2299                 bss = (void *)cfg80211_get_ibss(local->hw.wiphy,
2300                                                 NULL,
2301                                                 ifsta->ssid, ifsta->ssid_len);
2302
2303 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2304         if (bss)
2305                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
2306                        "%pM\n", bss->cbss.bssid, ifsta->bssid);
2307 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2308
2309         if (bss &&
2310             (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) ||
2311              memcmp(ifsta->bssid, bss->cbss.bssid, ETH_ALEN))) {
2312                 int ret;
2313
2314                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
2315                        " based on configured SSID\n",
2316                        sdata->dev->name, bss->cbss.bssid);
2317
2318                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
2319                 ieee80211_rx_bss_put(local, bss);
2320                 return ret;
2321         } else if (bss)
2322                 ieee80211_rx_bss_put(local, bss);
2323
2324 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2325         printk(KERN_DEBUG "   did not try to join ibss\n");
2326 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2327
2328         /* Selected IBSS not found in current scan results - try to scan */
2329         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
2330             !ieee80211_sta_active_ibss(sdata)) {
2331                 mod_timer(&ifsta->timer, jiffies +
2332                                       IEEE80211_IBSS_MERGE_INTERVAL);
2333         } else if (time_after(jiffies, local->last_scan_completed +
2334                               IEEE80211_SCAN_INTERVAL)) {
2335                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2336                        "join\n", sdata->dev->name);
2337
2338                 /* XXX maybe racy? */
2339                 if (local->scan_req)
2340                         return -EBUSY;
2341
2342                 memcpy(local->int_scan_req.ssids[0].ssid,
2343                        ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2344                 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2345                 return ieee80211_request_scan(sdata, &local->int_scan_req);
2346         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
2347                 int interval = IEEE80211_SCAN_INTERVAL;
2348
2349                 if (time_after(jiffies, ifsta->ibss_join_req +
2350                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2351                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2352                             (!(local->oper_channel->flags &
2353                                         IEEE80211_CHAN_NO_IBSS)))
2354                                 return ieee80211_sta_create_ibss(sdata, ifsta);
2355                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2356                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
2357                                        " %d MHz\n", sdata->dev->name,
2358                                        local->hw.conf.channel->center_freq);
2359                         }
2360
2361                         /* No IBSS found - decrease scan interval and continue
2362                          * scanning. */
2363                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2364                 }
2365
2366                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2367                 mod_timer(&ifsta->timer, jiffies + interval);
2368                 return 0;
2369         }
2370
2371         return 0;
2372 }
2373
2374
2375 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
2376                                      struct ieee80211_if_sta *ifsta)
2377 {
2378         struct ieee80211_local *local = sdata->local;
2379         struct ieee80211_bss *bss;
2380         u8 *bssid = ifsta->bssid, *ssid = ifsta->ssid;
2381         u8 ssid_len = ifsta->ssid_len;
2382         u16 capa_mask = WLAN_CAPABILITY_ESS;
2383         u16 capa_val = WLAN_CAPABILITY_ESS;
2384         struct ieee80211_channel *chan = local->oper_channel;
2385
2386         if (ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2387                             IEEE80211_STA_AUTO_BSSID_SEL |
2388                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
2389                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
2390                 if (sdata->default_key)
2391                         capa_val |= WLAN_CAPABILITY_PRIVACY;
2392         }
2393
2394         if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
2395                 chan = NULL;
2396
2397         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2398                 bssid = NULL;
2399
2400         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) {
2401                 ssid = NULL;
2402                 ssid_len = 0;
2403         }
2404
2405         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
2406                                        bssid, ssid, ssid_len,
2407                                        capa_mask, capa_val);
2408
2409         if (bss) {
2410                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
2411                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2412                         ieee80211_sta_set_ssid(sdata, bss->ssid,
2413                                                bss->ssid_len);
2414                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
2415                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
2416                                                     bss->supp_rates);
2417                 if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
2418                         sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
2419                 else
2420                         sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
2421
2422                 /* Send out direct probe if no probe resp was received or
2423                  * the one we have is outdated
2424                  */
2425                 if (!bss->last_probe_resp ||
2426                     time_after(jiffies, bss->last_probe_resp
2427                                         + IEEE80211_SCAN_RESULT_EXPIRE))
2428                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
2429                 else
2430                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2431
2432                 ieee80211_rx_bss_put(local, bss);
2433                 ieee80211_sta_reset_auth(sdata, ifsta);
2434                 return 0;
2435         } else {
2436                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
2437                         ifsta->assoc_scan_tries++;
2438                         /* XXX maybe racy? */
2439                         if (local->scan_req)
2440                                 return -1;
2441                         memcpy(local->int_scan_req.ssids[0].ssid,
2442                                ifsta->ssid, IEEE80211_MAX_SSID_LEN);
2443                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2444                                 local->int_scan_req.ssids[0].ssid_len = 0;
2445                         else
2446                                 local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
2447                         ieee80211_start_scan(sdata, &local->int_scan_req);
2448                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
2449                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2450                 } else {
2451                         ifsta->assoc_scan_tries = 0;
2452                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
2453                 }
2454         }
2455         return -1;
2456 }
2457
2458
2459 static void ieee80211_sta_work(struct work_struct *work)
2460 {
2461         struct ieee80211_sub_if_data *sdata =
2462                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2463         struct ieee80211_local *local = sdata->local;
2464         struct ieee80211_if_sta *ifsta;
2465         struct sk_buff *skb;
2466
2467         if (!netif_running(sdata->dev))
2468                 return;
2469
2470         if (local->sw_scanning || local->hw_scanning)
2471                 return;
2472
2473         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION &&
2474                     sdata->vif.type != NL80211_IFTYPE_ADHOC))
2475                 return;
2476         ifsta = &sdata->u.sta;
2477
2478         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2479                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
2480
2481         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
2482             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
2483             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
2484             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2485                 ieee80211_start_scan(sdata, local->scan_req);
2486                 return;
2487         }
2488
2489         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2490                 if (ieee80211_sta_config_auth(sdata, ifsta))
2491                         return;
2492                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2493         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2494                 return;
2495
2496         switch (ifsta->state) {
2497         case IEEE80211_STA_MLME_DISABLED:
2498                 break;
2499         case IEEE80211_STA_MLME_DIRECT_PROBE:
2500                 ieee80211_direct_probe(sdata, ifsta);
2501                 break;
2502         case IEEE80211_STA_MLME_AUTHENTICATE:
2503                 ieee80211_authenticate(sdata, ifsta);
2504                 break;
2505         case IEEE80211_STA_MLME_ASSOCIATE:
2506                 ieee80211_associate(sdata, ifsta);
2507                 break;
2508         case IEEE80211_STA_MLME_ASSOCIATED:
2509                 ieee80211_associated(sdata, ifsta);
2510                 break;
2511         case IEEE80211_STA_MLME_IBSS_SEARCH:
2512                 ieee80211_sta_find_ibss(sdata, ifsta);
2513                 break;
2514         case IEEE80211_STA_MLME_IBSS_JOINED:
2515                 ieee80211_sta_merge_ibss(sdata, ifsta);
2516                 break;
2517         default:
2518                 WARN_ON(1);
2519                 break;
2520         }
2521
2522         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
2523                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2524                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
2525
2526                 ieee80211_set_disassoc(sdata, ifsta, false, true,
2527                                         WLAN_REASON_UNSPECIFIED);
2528         }
2529 }
2530
2531 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2532 {
2533         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2534                 queue_work(sdata->local->hw.workqueue,
2535                            &sdata->u.sta.work);
2536 }
2537
2538 /* interface setup */
2539 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2540 {
2541         struct ieee80211_if_sta *ifsta;
2542
2543         ifsta = &sdata->u.sta;
2544         INIT_WORK(&ifsta->work, ieee80211_sta_work);
2545         INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
2546         setup_timer(&ifsta->timer, ieee80211_sta_timer,
2547                     (unsigned long) sdata);
2548         setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
2549                     (unsigned long) sdata);
2550         skb_queue_head_init(&ifsta->skb_queue);
2551
2552         ifsta->capab = WLAN_CAPABILITY_ESS;
2553         ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
2554                 IEEE80211_AUTH_ALG_SHARED_KEY;
2555         ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
2556                 IEEE80211_STA_AUTO_BSSID_SEL |
2557                 IEEE80211_STA_AUTO_CHANNEL_SEL;
2558         if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
2559                 ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
2560 }
2561
2562 /*
2563  * Add a new IBSS station, will also be called by the RX code when,
2564  * in IBSS mode, receiving a frame from a yet-unknown station, hence
2565  * must be callable in atomic context.
2566  */
2567 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
2568                                         u8 *bssid,u8 *addr, u32 supp_rates)
2569 {
2570         struct ieee80211_local *local = sdata->local;
2571         struct sta_info *sta;
2572         int band = local->hw.conf.channel->band;
2573
2574         /* TODO: Could consider removing the least recently used entry and
2575          * allow new one to be added. */
2576         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
2577                 if (net_ratelimit()) {
2578                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
2579                                "entry %pM\n", sdata->dev->name, addr);
2580                 }
2581                 return NULL;
2582         }
2583
2584         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
2585                 return NULL;
2586
2587 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2588         printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n",
2589                wiphy_name(local->hw.wiphy), addr, sdata->dev->name);
2590 #endif
2591
2592         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
2593         if (!sta)
2594                 return NULL;
2595
2596         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
2597
2598         /* make sure mandatory rates are always added */
2599         sta->sta.supp_rates[band] = supp_rates |
2600                         ieee80211_mandatory_rates(local, band);
2601
2602         rate_control_rate_init(sta);
2603
2604         if (sta_info_insert(sta))
2605                 return NULL;
2606
2607         return sta;
2608 }
2609
2610 /* configuration hooks */
2611 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
2612                             struct ieee80211_if_sta *ifsta)
2613 {
2614         struct ieee80211_local *local = sdata->local;
2615
2616         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2617                 return;
2618
2619         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2620                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
2621             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2622                              IEEE80211_STA_AUTO_SSID_SEL))) {
2623
2624                 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED)
2625                         ieee80211_set_disassoc(sdata, ifsta, true, true,
2626                                                WLAN_REASON_DEAUTH_LEAVING);
2627
2628                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2629                 queue_work(local->hw.workqueue, &ifsta->work);
2630         }
2631 }
2632
2633 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
2634 {
2635         struct ieee80211_if_sta *ifsta;
2636
2637         if (len > IEEE80211_MAX_SSID_LEN)
2638                 return -EINVAL;
2639
2640         ifsta = &sdata->u.sta;
2641
2642         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
2643                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
2644                 memcpy(ifsta->ssid, ssid, len);
2645                 ifsta->ssid_len = len;
2646         }
2647
2648         ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2649
2650         if (len)
2651                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2652         else
2653                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2654
2655         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2656                 ifsta->ibss_join_req = jiffies;
2657                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
2658                 return ieee80211_sta_find_ibss(sdata, ifsta);
2659         }
2660
2661         return 0;
2662 }
2663
2664 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2665 {
2666         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2667         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2668         *len = ifsta->ssid_len;
2669         return 0;
2670 }
2671
2672 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2673 {
2674         struct ieee80211_if_sta *ifsta;
2675
2676         ifsta = &sdata->u.sta;
2677
2678         if (is_valid_ether_addr(bssid)) {
2679                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2680                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2681         } else {
2682                 memset(ifsta->bssid, 0, ETH_ALEN);
2683                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2684         }
2685
2686         if (netif_running(sdata->dev)) {
2687                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2688                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2689                                "the low-level driver\n", sdata->dev->name);
2690                 }
2691         }
2692
2693         return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
2694 }
2695
2696 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
2697 {
2698         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2699
2700         kfree(ifsta->extra_ie);
2701         if (len == 0) {
2702                 ifsta->extra_ie = NULL;
2703                 ifsta->extra_ie_len = 0;
2704                 return 0;
2705         }
2706         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
2707         if (!ifsta->extra_ie) {
2708                 ifsta->extra_ie_len = 0;
2709                 return -ENOMEM;
2710         }
2711         memcpy(ifsta->extra_ie, ie, len);
2712         ifsta->extra_ie_len = len;
2713         return 0;
2714 }
2715
2716 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2717 {
2718         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2719
2720         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2721                sdata->dev->name, reason);
2722
2723         if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2724             sdata->vif.type != NL80211_IFTYPE_ADHOC)
2725                 return -EINVAL;
2726
2727         ieee80211_set_disassoc(sdata, ifsta, true, true, reason);
2728         return 0;
2729 }
2730
2731 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2732 {
2733         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2734
2735         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2736                sdata->dev->name, reason);
2737
2738         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2739                 return -EINVAL;
2740
2741         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
2742                 return -1;
2743
2744         ieee80211_set_disassoc(sdata, ifsta, false, true, reason);
2745         return 0;
2746 }
2747
2748 /* scan finished notification */
2749 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2750 {
2751         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2752         struct ieee80211_if_sta *ifsta;
2753
2754         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2755                 ifsta = &sdata->u.sta;
2756                 if ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
2757                     !ieee80211_sta_active_ibss(sdata))
2758                         ieee80211_sta_find_ibss(sdata, ifsta);
2759         }
2760
2761         /* Restart STA timers */
2762         rcu_read_lock();
2763         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2764                 ieee80211_restart_sta_timer(sdata);
2765         rcu_read_unlock();
2766 }
2767
2768 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2769 {
2770         struct ieee80211_local *local =
2771                 container_of(work, struct ieee80211_local,
2772                              dynamic_ps_disable_work);
2773
2774         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2775                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2776                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2777         }
2778
2779         ieee80211_wake_queues_by_reason(&local->hw,
2780                                         IEEE80211_QUEUE_STOP_REASON_PS);
2781 }
2782
2783 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2784 {
2785         struct ieee80211_local *local =
2786                 container_of(work, struct ieee80211_local,
2787                              dynamic_ps_enable_work);
2788         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2789
2790         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2791                 return;
2792
2793         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2794                 ieee80211_send_nullfunc(local, sdata, 1);
2795
2796         local->hw.conf.flags |= IEEE80211_CONF_PS;
2797         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2798 }
2799
2800 void ieee80211_dynamic_ps_timer(unsigned long data)
2801 {
2802         struct ieee80211_local *local = (void *) data;
2803
2804         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2805 }