net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.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 /* TODO:
  15  * order BSS list by RSSI(?) ("quality of AP")
  16  * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
  17  *    SSID)
  18  */
  19 #include <linux/delay.h>
  20 #include <linux/if_ether.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/wireless.h>
  25 #include <linux/random.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/rtnetlink.h>
  28 #include <net/iw_handler.h>
  29 #include <asm/types.h>
  30
  31 #include <net/mac80211.h>
  32 #include "ieee80211_i.h"
  33 #include "rate.h"
  34 #include "led.h"
  35 #include "mesh.h"
  36
  37 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  38 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  39 #define IEEE80211_AUTH_MAX_TRIES 3
  40 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  41 #define IEEE80211_ASSOC_MAX_TRIES 3
  42 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  43 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
  44 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  45 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  46 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  47 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  48 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
  49
  50 #define IEEE80211_PROBE_DELAY (HZ / 33)
  51 #define IEEE80211_CHANNEL_TIME (HZ / 33)
  52 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
  53 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
  54 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  55 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  56 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
  57
  58 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  59
  60
  61 #define ERP_INFO_USE_PROTECTION BIT(1)
  62
  63 /* mgmt header + 1 byte action code */
  64 #define IEEE80211_MIN_ACTION_SIZE (24 + 1)
  65
  66 #define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
  67 #define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
  68 #define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0
  69 #define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
  70 #define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
  71
  72 /* next values represent the buffer size for A-MPDU frame.
  73  * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */
  74 #define IEEE80211_MIN_AMPDU_BUF 0x8
  75 #define IEEE80211_MAX_AMPDU_BUF 0x40
  76
  77 static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
  78                                      u8 *ssid, size_t ssid_len);
  79 static struct ieee80211_sta_bss *
  80 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
  81                      u8 *ssid, u8 ssid_len);
  82 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
  83                                  struct ieee80211_sta_bss *bss);
  84 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
  85                                    struct ieee80211_if_sta *ifsta);
  86 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata);
  87 static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *sdata,
  88                                     u8 *ssid, size_t ssid_len);
  89 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
  90                                      struct ieee80211_if_sta *ifsta);
  91 static void sta_rx_agg_session_timer_expired(unsigned long data);
  92
  93
  94 void ieee802_11_parse_elems(u8 *start, size_t len,
  95                             struct ieee802_11_elems *elems)
  96 {
  97         size_t left = len;
  98         u8 *pos = start;
  99
 100         memset(elems, 0, sizeof(*elems));
 101         elems->ie_start = start;
 102         elems->total_len = len;
 103
 104         while (left >= 2) {
 105                 u8 id, elen;
 106
 107                 id = *pos++;
 108                 elen = *pos++;
 109                 left -= 2;
 110
 111                 if (elen > left)
 112                         return;
 113
 114                 switch (id) {
 115                 case WLAN_EID_SSID:
 116                         elems->ssid = pos;
 117                         elems->ssid_len = elen;
 118                         break;
 119                 case WLAN_EID_SUPP_RATES:
 120                         elems->supp_rates = pos;
 121                         elems->supp_rates_len = elen;
 122                         break;
 123                 case WLAN_EID_FH_PARAMS:
 124                         elems->fh_params = pos;
 125                         elems->fh_params_len = elen;
 126                         break;
 127                 case WLAN_EID_DS_PARAMS:
 128                         elems->ds_params = pos;
 129                         elems->ds_params_len = elen;
 130                         break;
 131                 case WLAN_EID_CF_PARAMS:
 132                         elems->cf_params = pos;
 133                         elems->cf_params_len = elen;
 134                         break;
 135                 case WLAN_EID_TIM:
 136                         elems->tim = pos;
 137                         elems->tim_len = elen;
 138                         break;
 139                 case WLAN_EID_IBSS_PARAMS:
 140                         elems->ibss_params = pos;
 141                         elems->ibss_params_len = elen;
 142                         break;
 143                 case WLAN_EID_CHALLENGE:
 144                         elems->challenge = pos;
 145                         elems->challenge_len = elen;
 146                         break;
 147                 case WLAN_EID_WPA:
 148                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 149                             pos[2] == 0xf2) {
 150                                 /* Microsoft OUI (00:50:F2) */
 151                                 if (pos[3] == 1) {
 152                                         /* OUI Type 1 - WPA IE */
 153                                         elems->wpa = pos;
 154                                         elems->wpa_len = elen;
 155                                 } else if (elen >= 5 && pos[3] == 2) {
 156                                         if (pos[4] == 0) {
 157                                                 elems->wmm_info = pos;
 158                                                 elems->wmm_info_len = elen;
 159                                         } else if (pos[4] == 1) {
 160                                                 elems->wmm_param = pos;
 161                                                 elems->wmm_param_len = elen;
 162                                         }
 163                                 }
 164                         }
 165                         break;
 166                 case WLAN_EID_RSN:
 167                         elems->rsn = pos;
 168                         elems->rsn_len = elen;
 169                         break;
 170                 case WLAN_EID_ERP_INFO:
 171                         elems->erp_info = pos;
 172                         elems->erp_info_len = elen;
 173                         break;
 174                 case WLAN_EID_EXT_SUPP_RATES:
 175                         elems->ext_supp_rates = pos;
 176                         elems->ext_supp_rates_len = elen;
 177                         break;
 178                 case WLAN_EID_HT_CAPABILITY:
 179                         elems->ht_cap_elem = pos;
 180                         elems->ht_cap_elem_len = elen;
 181                         break;
 182                 case WLAN_EID_HT_EXTRA_INFO:
 183                         elems->ht_info_elem = pos;
 184                         elems->ht_info_elem_len = elen;
 185                         break;
 186                 case WLAN_EID_MESH_ID:
 187                         elems->mesh_id = pos;
 188                         elems->mesh_id_len = elen;
 189                         break;
 190                 case WLAN_EID_MESH_CONFIG:
 191                         elems->mesh_config = pos;
 192                         elems->mesh_config_len = elen;
 193                         break;
 194                 case WLAN_EID_PEER_LINK:
 195                         elems->peer_link = pos;
 196                         elems->peer_link_len = elen;
 197                         break;
 198                 case WLAN_EID_PREQ:
 199                         elems->preq = pos;
 200                         elems->preq_len = elen;
 201                         break;
 202                 case WLAN_EID_PREP:
 203                         elems->prep = pos;
 204                         elems->prep_len = elen;
 205                         break;
 206                 case WLAN_EID_PERR:
 207                         elems->perr = pos;
 208                         elems->perr_len = elen;
 209                         break;
 210                 case WLAN_EID_CHANNEL_SWITCH:
 211                         elems->ch_switch_elem = pos;
 212                         elems->ch_switch_elem_len = elen;
 213                         break;
 214                 case WLAN_EID_QUIET:
 215                         if (!elems->quiet_elem) {
 216                                 elems->quiet_elem = pos;
 217                                 elems->quiet_elem_len = elen;
 218                         }
 219                         elems->num_of_quiet_elem++;
 220                         break;
 221                 case WLAN_EID_COUNTRY:
 222                         elems->country_elem = pos;
 223                         elems->country_elem_len = elen;
 224                         break;
 225                 case WLAN_EID_PWR_CONSTRAINT:
 226                         elems->pwr_constr_elem = pos;
 227                         elems->pwr_constr_elem_len = elen;
 228                         break;
 229                 default:
 230                         break;
 231                 }
 232
 233                 left -= elen;
 234                 pos += elen;
 235         }
 236 }
 237
 238
 239 static u8 * ieee80211_bss_get_ie(struct ieee80211_sta_bss *bss, u8 ie)
 240 {
 241         u8 *end, *pos;
 242
 243         pos = bss->ies;
 244         if (pos == NULL)
 245                 return NULL;
 246         end = pos + bss->ies_len;
 247
 248         while (pos + 1 < end) {
 249                 if (pos + 2 + pos[1] > end)
 250                         break;
 251                 if (pos[0] == ie)
 252                         return pos;
 253                 pos += 2 + pos[1];
 254         }
 255
 256         return NULL;
 257 }
 258
 259
 260 static int ecw2cw(int ecw)
 261 {
 262         return (1 << ecw) - 1;
 263 }
 264
 265
 266 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 267                                          struct ieee80211_sta_bss *bss,
 268                                          int ibss)
 269 {
 270         struct ieee80211_local *local = sdata->local;
 271         int i, have_higher_than_11mbit = 0;
 272
 273
 274         /* cf. IEEE 802.11 9.2.12 */
 275         for (i = 0; i < bss->supp_rates_len; i++)
 276                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
 277                         have_higher_than_11mbit = 1;
 278
 279         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 280             have_higher_than_11mbit)
 281                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 282         else
 283                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 284
 285
 286         if (local->ops->conf_tx) {
 287                 struct ieee80211_tx_queue_params qparam;
 288
 289                 memset(&qparam, 0, sizeof(qparam));
 290
 291                 qparam.aifs = 2;
 292
 293                 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 294                     !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
 295                         qparam.cw_min = 31;
 296                 else
 297                         qparam.cw_min = 15;
 298
 299                 qparam.cw_max = 1023;
 300                 qparam.txop = 0;
 301
 302                 for (i = 0; i < local_to_hw(local)->queues; i++)
 303                         local->ops->conf_tx(local_to_hw(local), i, &qparam);
 304         }
 305 }
 306
 307 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 308                                      struct ieee80211_if_sta *ifsta,
 309                                      u8 *wmm_param, size_t wmm_param_len)
 310 {
 311         struct ieee80211_tx_queue_params params;
 312         size_t left;
 313         int count;
 314         u8 *pos;
 315
 316         if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
 317                 return;
 318
 319         if (!wmm_param)
 320                 return;
 321
 322         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 323                 return;
 324         count = wmm_param[6] & 0x0f;
 325         if (count == ifsta->wmm_last_param_set)
 326                 return;
 327         ifsta->wmm_last_param_set = count;
 328
 329         pos = wmm_param + 8;
 330         left = wmm_param_len - 8;
 331
 332         memset(&params, 0, sizeof(params));
 333
 334         if (!local->ops->conf_tx)
 335                 return;
 336
 337         local->wmm_acm = 0;
 338         for (; left >= 4; left -= 4, pos += 4) {
 339                 int aci = (pos[0] >> 5) & 0x03;
 340                 int acm = (pos[0] >> 4) & 0x01;
 341                 int queue;
 342
 343                 switch (aci) {
 344                 case 1:
 345                         queue = 3;
 346                         if (acm)
 347                                 local->wmm_acm |= BIT(0) | BIT(3);
 348                         break;
 349                 case 2:
 350                         queue = 1;
 351                         if (acm)
 352                                 local->wmm_acm |= BIT(4) | BIT(5);
 353                         break;
 354                 case 3:
 355                         queue = 0;
 356                         if (acm)
 357                                 local->wmm_acm |= BIT(6) | BIT(7);
 358                         break;
 359                 case 0:
 360                 default:
 361                         queue = 2;
 362                         if (acm)
 363                                 local->wmm_acm |= BIT(1) | BIT(2);
 364                         break;
 365                 }
 366
 367                 params.aifs = pos[0] & 0x0f;
 368                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 369                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 370                 params.txop = get_unaligned_le16(pos + 2);
 371 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 372                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 373                        "cWmin=%d cWmax=%d txop=%d\n",
 374                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 375                        params.cw_max, params.txop);
 376 #endif
 377                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 378                  * AC for now) */
 379                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 380                         printk(KERN_DEBUG "%s: failed to set TX queue "
 381                                "parameters for queue %d\n", local->mdev->name, queue);
 382                 }
 383         }
 384 }
 385
 386 static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
 387                                            bool use_protection,
 388                                            bool use_short_preamble)
 389 {
 390         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
 391 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 392         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 393         DECLARE_MAC_BUF(mac);
 394 #endif
 395         u32 changed = 0;
 396
 397         if (use_protection != bss_conf->use_cts_prot) {
 398 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 399                 if (net_ratelimit()) {
 400                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
 401                                "%s)\n",
 402                                sdata->dev->name,
 403                                use_protection ? "enabled" : "disabled",
 404                                print_mac(mac, ifsta->bssid));
 405                 }
 406 #endif
 407                 bss_conf->use_cts_prot = use_protection;
 408                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 409         }
 410
 411         if (use_short_preamble != bss_conf->use_short_preamble) {
 412 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 413                 if (net_ratelimit()) {
 414                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 415                                " (BSSID=%s)\n",
 416                                sdata->dev->name,
 417                                use_short_preamble ? "short" : "long",
 418                                print_mac(mac, ifsta->bssid));
 419                 }
 420 #endif
 421                 bss_conf->use_short_preamble = use_short_preamble;
 422                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 423         }
 424
 425         return changed;
 426 }
 427
 428 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
 429                                    u8 erp_value)
 430 {
 431         bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
 432         bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
 433
 434         return ieee80211_handle_protect_preamb(sdata,
 435                         use_protection, use_short_preamble);
 436 }
 437
 438 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 439                                            struct ieee80211_sta_bss *bss)
 440 {
 441         u32 changed = 0;
 442
 443         if (bss->has_erp_value)
 444                 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
 445         else {
 446                 u16 capab = bss->capability;
 447                 changed |= ieee80211_handle_protect_preamb(sdata, false,
 448                                 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
 449         }
 450
 451         return changed;
 452 }
 453
 454 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
 455                                    struct ieee80211_ht_info *ht_info)
 456 {
 457
 458         if (ht_info == NULL)
 459                 return -EINVAL;
 460
 461         memset(ht_info, 0, sizeof(*ht_info));
 462
 463         if (ht_cap_ie) {
 464                 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
 465
 466                 ht_info->ht_supported = 1;
 467                 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
 468                 ht_info->ampdu_factor =
 469                         ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
 470                 ht_info->ampdu_density =
 471                         (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
 472                 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
 473         } else
 474                 ht_info->ht_supported = 0;
 475
 476         return 0;
 477 }
 478
 479 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
 480                         struct ieee80211_ht_addt_info *ht_add_info_ie,
 481                         struct ieee80211_ht_bss_info *bss_info)
 482 {
 483         if (bss_info == NULL)
 484                 return -EINVAL;
 485
 486         memset(bss_info, 0, sizeof(*bss_info));
 487
 488         if (ht_add_info_ie) {
 489                 u16 op_mode;
 490                 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
 491
 492                 bss_info->primary_channel = ht_add_info_ie->control_chan;
 493                 bss_info->bss_cap = ht_add_info_ie->ht_param;
 494                 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
 495         }
 496
 497         return 0;
 498 }
 499
 500 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 501                                          struct ieee80211_if_sta *ifsta)
 502 {
 503         union iwreq_data wrqu;
 504
 505         if (ifsta->assocreq_ies) {
 506                 memset(&wrqu, 0, sizeof(wrqu));
 507                 wrqu.data.length = ifsta->assocreq_ies_len;
 508                 wireless_send_event(sdata->dev, IWEVASSOCREQIE, &wrqu,
 509                                     ifsta->assocreq_ies);
 510         }
 511         if (ifsta->assocresp_ies) {
 512                 memset(&wrqu, 0, sizeof(wrqu));
 513                 wrqu.data.length = ifsta->assocresp_ies_len;
 514                 wireless_send_event(sdata->dev, IWEVASSOCRESPIE, &wrqu,
 515                                     ifsta->assocresp_ies);
 516         }
 517 }
 518
 519
 520 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 521                                      struct ieee80211_if_sta *ifsta,
 522                                      bool assoc)
 523 {
 524         struct ieee80211_local *local = sdata->local;
 525         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 526         union iwreq_data wrqu;
 527         u32 changed = BSS_CHANGED_ASSOC;
 528
 529         if (assoc) {
 530                 struct ieee80211_sta_bss *bss;
 531
 532                 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 533
 534                 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
 535                         return;
 536
 537                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 538                                            conf->channel->center_freq,
 539                                            ifsta->ssid, ifsta->ssid_len);
 540                 if (bss) {
 541                         /* set timing information */
 542                         sdata->bss_conf.beacon_int = bss->beacon_int;
 543                         sdata->bss_conf.timestamp = bss->timestamp;
 544                         sdata->bss_conf.dtim_period = bss->dtim_period;
 545
 546                         changed |= ieee80211_handle_bss_capability(sdata, bss);
 547
 548                         ieee80211_rx_bss_put(local, bss);
 549                 }
 550
 551                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
 552                         changed |= BSS_CHANGED_HT;
 553                         sdata->bss_conf.assoc_ht = 1;
 554                         sdata->bss_conf.ht_conf = &conf->ht_conf;
 555                         sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
 556                 }
 557
 558                 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 559                 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 560                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 561                 ieee80211_sta_send_associnfo(sdata, ifsta);
 562         } else {
 563                 netif_carrier_off(sdata->dev);
 564                 ieee80211_sta_tear_down_BA_sessions(sdata, ifsta->bssid);
 565                 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 566                 changed |= ieee80211_reset_erp_info(sdata);
 567
 568                 sdata->bss_conf.assoc_ht = 0;
 569                 sdata->bss_conf.ht_conf = NULL;
 570                 sdata->bss_conf.ht_bss_conf = NULL;
 571
 572                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 573         }
 574         ifsta->last_probe = jiffies;
 575         ieee80211_led_assoc(local, assoc);
 576
 577         sdata->bss_conf.assoc = assoc;
 578         ieee80211_bss_info_change_notify(sdata, changed);
 579
 580         if (assoc)
 581                 netif_carrier_on(sdata->dev);
 582
 583         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 584         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 585 }
 586
 587 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 588                                    struct ieee80211_if_sta *ifsta, int deauth)
 589 {
 590         if (deauth) {
 591                 ifsta->direct_probe_tries = 0;
 592                 ifsta->auth_tries = 0;
 593         }
 594         ifsta->assoc_scan_tries = 0;
 595         ifsta->assoc_tries = 0;
 596         ieee80211_set_associated(sdata, ifsta, 0);
 597 }
 598
 599 void ieee80211_sta_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 600                       int encrypt)
 601 {
 602         skb->dev = sdata->local->mdev;
 603         skb_set_mac_header(skb, 0);
 604         skb_set_network_header(skb, 0);
 605         skb_set_transport_header(skb, 0);
 606
 607         skb->iif = sdata->dev->ifindex;
 608         skb->do_not_encrypt = !encrypt;
 609
 610         dev_queue_xmit(skb);
 611 }
 612
 613
 614 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 615                                 struct ieee80211_if_sta *ifsta,
 616                                 int transaction, u8 *extra, size_t extra_len,
 617                                 int encrypt)
 618 {
 619         struct ieee80211_local *local = sdata->local;
 620         struct sk_buff *skb;
 621         struct ieee80211_mgmt *mgmt;
 622
 623         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 624                             sizeof(*mgmt) + 6 + extra_len);
 625         if (!skb) {
 626                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 627                        "frame\n", sdata->dev->name);
 628                 return;
 629         }
 630         skb_reserve(skb, local->hw.extra_tx_headroom);
 631
 632         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 633         memset(mgmt, 0, 24 + 6);
 634         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 635                                           IEEE80211_STYPE_AUTH);
 636         if (encrypt)
 637                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 638         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 639         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 640         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 641         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 642         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 643         ifsta->auth_transaction = transaction + 1;
 644         mgmt->u.auth.status_code = cpu_to_le16(0);
 645         if (extra)
 646                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 647
 648         ieee80211_sta_tx(sdata, skb, encrypt);
 649 }
 650
 651 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
 652                                    struct ieee80211_if_sta *ifsta)
 653 {
 654         DECLARE_MAC_BUF(mac);
 655
 656         ifsta->direct_probe_tries++;
 657         if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 658                 printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n",
 659                        sdata->dev->name, print_mac(mac, ifsta->bssid));
 660                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 661                 return;
 662         }
 663
 664         printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n",
 665                         sdata->dev->name, print_mac(mac, ifsta->bssid),
 666                         ifsta->direct_probe_tries);
 667
 668         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 669
 670         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);
 671
 672         /* Direct probe is sent to broadcast address as some APs
 673          * will not answer to direct packet in unassociated state.
 674          */
 675         ieee80211_send_probe_req(sdata, NULL,
 676                                  ifsta->ssid, ifsta->ssid_len);
 677
 678         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 679 }
 680
 681
 682 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
 683                                    struct ieee80211_if_sta *ifsta)
 684 {
 685         DECLARE_MAC_BUF(mac);
 686
 687         ifsta->auth_tries++;
 688         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 689                 printk(KERN_DEBUG "%s: authentication with AP %s"
 690                        " timed out\n",
 691                        sdata->dev->name, print_mac(mac, ifsta->bssid));
 692                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
 693                 return;
 694         }
 695
 696         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 697         printk(KERN_DEBUG "%s: authenticate with AP %s\n",
 698                sdata->dev->name, print_mac(mac, ifsta->bssid));
 699
 700         ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
 701
 702         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 703 }
 704
 705 static int ieee80211_compatible_rates(struct ieee80211_sta_bss *bss,
 706                                       struct ieee80211_supported_band *sband,
 707                                       u64 *rates)
 708 {
 709         int i, j, count;
 710         *rates = 0;
 711         count = 0;
 712         for (i = 0; i < bss->supp_rates_len; i++) {
 713                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
 714
 715                 for (j = 0; j < sband->n_bitrates; j++)
 716                         if (sband->bitrates[j].bitrate == rate) {
 717                                 *rates |= BIT(j);
 718                                 count++;
 719                                 break;
 720                         }
 721         }
 722
 723         return count;
 724 }
 725
 726 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
 727                                  struct ieee80211_if_sta *ifsta)
 728 {
 729         struct ieee80211_local *local = sdata->local;
 730         struct sk_buff *skb;
 731         struct ieee80211_mgmt *mgmt;
 732         u8 *pos, *ies, *ht_add_ie;
 733         int i, len, count, rates_len, supp_rates_len;
 734         u16 capab;
 735         struct ieee80211_sta_bss *bss;
 736         int wmm = 0;
 737         struct ieee80211_supported_band *sband;
 738         u64 rates = 0;
 739
 740         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 741                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 742                             ifsta->ssid_len);
 743         if (!skb) {
 744                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 745                        "frame\n", sdata->dev->name);
 746                 return;
 747         }
 748         skb_reserve(skb, local->hw.extra_tx_headroom);
 749
 750         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 751
 752         capab = ifsta->capab;
 753
 754         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 755                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 756                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 757                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 758                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 759         }
 760
 761         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
 762                                    local->hw.conf.channel->center_freq,
 763                                    ifsta->ssid, ifsta->ssid_len);
 764         if (bss) {
 765                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 766                         capab |= WLAN_CAPABILITY_PRIVACY;
 767                 if (bss->wmm_used)
 768                         wmm = 1;
 769
 770                 /* get all rates supported by the device and the AP as
 771                  * some APs don't like getting a superset of their rates
 772                  * in the association request (e.g. D-Link DAP 1353 in
 773                  * b-only mode) */
 774                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 775
 776                 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 777                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 778                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 779
 780                 ieee80211_rx_bss_put(local, bss);
 781         } else {
 782                 rates = ~0;
 783                 rates_len = sband->n_bitrates;
 784         }
 785
 786         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 787         memset(mgmt, 0, 24);
 788         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 789         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 790         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 791
 792         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 793                 skb_put(skb, 10);
 794                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 795                                                   IEEE80211_STYPE_REASSOC_REQ);
 796                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 797                 mgmt->u.reassoc_req.listen_interval =
 798                                 cpu_to_le16(local->hw.conf.listen_interval);
 799                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 800                        ETH_ALEN);
 801         } else {
 802                 skb_put(skb, 4);
 803                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 804                                                   IEEE80211_STYPE_ASSOC_REQ);
 805                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 806                 mgmt->u.reassoc_req.listen_interval =
 807                                 cpu_to_le16(local->hw.conf.listen_interval);
 808         }
 809
 810         /* SSID */
 811         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 812         *pos++ = WLAN_EID_SSID;
 813         *pos++ = ifsta->ssid_len;
 814         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 815
 816         /* add all rates which were marked to be used above */
 817         supp_rates_len = rates_len;
 818         if (supp_rates_len > 8)
 819                 supp_rates_len = 8;
 820
 821         len = sband->n_bitrates;
 822         pos = skb_put(skb, supp_rates_len + 2);
 823         *pos++ = WLAN_EID_SUPP_RATES;
 824         *pos++ = supp_rates_len;
 825
 826         count = 0;
 827         for (i = 0; i < sband->n_bitrates; i++) {
 828                 if (BIT(i) & rates) {
 829                         int rate = sband->bitrates[i].bitrate;
 830                         *pos++ = (u8) (rate / 5);
 831                         if (++count == 8)
 832                                 break;
 833                 }
 834         }
 835
 836         if (rates_len > count) {
 837                 pos = skb_put(skb, rates_len - count + 2);
 838                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 839                 *pos++ = rates_len - count;
 840
 841                 for (i++; i < sband->n_bitrates; i++) {
 842                         if (BIT(i) & rates) {
 843                                 int rate = sband->bitrates[i].bitrate;
 844                                 *pos++ = (u8) (rate / 5);
 845                         }
 846                 }
 847         }
 848
 849         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 850                 /* 1. power capabilities */
 851                 pos = skb_put(skb, 4);
 852                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 853                 *pos++ = 2;
 854                 *pos++ = 0; /* min tx power */
 855                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 856
 857                 /* 2. supported channels */
 858                 /* TODO: get this in reg domain format */
 859                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 860                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 861                 *pos++ = 2 * sband->n_channels;
 862                 for (i = 0; i < sband->n_channels; i++) {
 863                         *pos++ = ieee80211_frequency_to_channel(
 864                                         sband->channels[i].center_freq);
 865                         *pos++ = 1; /* one channel in the subband*/
 866                 }
 867         }
 868
 869         if (ifsta->extra_ie) {
 870                 pos = skb_put(skb, ifsta->extra_ie_len);
 871                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 872         }
 873
 874         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 875                 pos = skb_put(skb, 9);
 876                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 877                 *pos++ = 7; /* len */
 878                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 879                 *pos++ = 0x50;
 880                 *pos++ = 0xf2;
 881                 *pos++ = 2; /* WME */
 882                 *pos++ = 0; /* WME info */
 883                 *pos++ = 1; /* WME ver */
 884                 *pos++ = 0;
 885         }
 886
 887         /* wmm support is a must to HT */
 888         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
 889             sband->ht_info.ht_supported &&
 890             (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
 891                 struct ieee80211_ht_addt_info *ht_add_info =
 892                         (struct ieee80211_ht_addt_info *)ht_add_ie;
 893                 u16 cap = sband->ht_info.cap;
 894                 __le16 tmp;
 895                 u32 flags = local->hw.conf.channel->flags;
 896
 897                 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
 898                 case IEEE80211_HT_IE_CHA_SEC_ABOVE:
 899                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 900                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
 901                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 902                         }
 903                         break;
 904                 case IEEE80211_HT_IE_CHA_SEC_BELOW:
 905                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 906                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
 907                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 908                         }
 909                         break;
 910                 }
 911
 912                 tmp = cpu_to_le16(cap);
 913                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 914                 *pos++ = WLAN_EID_HT_CAPABILITY;
 915                 *pos++ = sizeof(struct ieee80211_ht_cap);
 916                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 917                 memcpy(pos, &tmp, sizeof(u16));
 918                 pos += sizeof(u16);
 919                 /* TODO: needs a define here for << 2 */
 920                 *pos++ = sband->ht_info.ampdu_factor |
 921                          (sband->ht_info.ampdu_density << 2);
 922                 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
 923         }
 924
 925         kfree(ifsta->assocreq_ies);
 926         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 927         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 928         if (ifsta->assocreq_ies)
 929                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 930
 931         ieee80211_sta_tx(sdata, skb, 0);
 932 }
 933
 934
 935 static void ieee80211_send_deauth(struct ieee80211_sub_if_data *sdata,
 936                                   struct ieee80211_if_sta *ifsta, u16 reason)
 937 {
 938         struct ieee80211_local *local = sdata->local;
 939         struct sk_buff *skb;
 940         struct ieee80211_mgmt *mgmt;
 941
 942         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 943         if (!skb) {
 944                 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
 945                        "frame\n", sdata->dev->name);
 946                 return;
 947         }
 948         skb_reserve(skb, local->hw.extra_tx_headroom);
 949
 950         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 951         memset(mgmt, 0, 24);
 952         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 953         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 954         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 955         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 956                                           IEEE80211_STYPE_DEAUTH);
 957         skb_put(skb, 2);
 958         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 959
 960         ieee80211_sta_tx(sdata, skb, 0);
 961 }
 962
 963
 964 static void ieee80211_send_disassoc(struct ieee80211_sub_if_data *sdata,
 965                                     struct ieee80211_if_sta *ifsta, u16 reason)
 966 {
 967         struct ieee80211_local *local = sdata->local;
 968         struct sk_buff *skb;
 969         struct ieee80211_mgmt *mgmt;
 970
 971         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 972         if (!skb) {
 973                 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
 974                        "frame\n", sdata->dev->name);
 975                 return;
 976         }
 977         skb_reserve(skb, local->hw.extra_tx_headroom);
 978
 979         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 980         memset(mgmt, 0, 24);
 981         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 982         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 983         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 984         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 985                                           IEEE80211_STYPE_DISASSOC);
 986         skb_put(skb, 2);
 987         mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
 988
 989         ieee80211_sta_tx(sdata, skb, 0);
 990 }
 991
 992
 993 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
 994                                       struct ieee80211_if_sta *ifsta)
 995 {
 996         struct ieee80211_local *local = sdata->local;
 997         struct ieee80211_sta_bss *bss;
 998         int bss_privacy;
 999         int wep_privacy;
1000         int privacy_invoked;
1001
1002         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1003                 return 0;
1004
1005         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1006                                    local->hw.conf.channel->center_freq,
1007                                    ifsta->ssid, ifsta->ssid_len);
1008         if (!bss)
1009                 return 0;
1010
1011         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
1012         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1013         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1014
1015         ieee80211_rx_bss_put(local, bss);
1016
1017         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
1018                 return 0;
1019
1020         return 1;
1021 }
1022
1023
1024 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1025                                 struct ieee80211_if_sta *ifsta)
1026 {
1027         DECLARE_MAC_BUF(mac);
1028
1029         ifsta->assoc_tries++;
1030         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1031                 printk(KERN_DEBUG "%s: association with AP %s"
1032                        " timed out\n",
1033                        sdata->dev->name, print_mac(mac, ifsta->bssid));
1034                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1035                 return;
1036         }
1037
1038         ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1039         printk(KERN_DEBUG "%s: associate with AP %s\n",
1040                sdata->dev->name, print_mac(mac, ifsta->bssid));
1041         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1042                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1043                        "mixed-cell disabled - abort association\n", sdata->dev->name);
1044                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1045                 return;
1046         }
1047
1048         ieee80211_send_assoc(sdata, ifsta);
1049
1050         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
1051 }
1052
1053
1054 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1055                                  struct ieee80211_if_sta *ifsta)
1056 {
1057         struct ieee80211_local *local = sdata->local;
1058         struct sta_info *sta;
1059         int disassoc;
1060         DECLARE_MAC_BUF(mac);
1061
1062         /* TODO: start monitoring current AP signal quality and number of
1063          * missed beacons. Scan other channels every now and then and search
1064          * for better APs. */
1065         /* TODO: remove expired BSSes */
1066
1067         ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1068
1069         rcu_read_lock();
1070
1071         sta = sta_info_get(local, ifsta->bssid);
1072         if (!sta) {
1073                 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
1074                        sdata->dev->name, print_mac(mac, ifsta->bssid));
1075                 disassoc = 1;
1076         } else {
1077                 disassoc = 0;
1078                 if (time_after(jiffies,
1079                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1080                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1081                                 printk(KERN_DEBUG "%s: No ProbeResp from "
1082                                        "current AP %s - assume out of "
1083                                        "range\n",
1084                                        sdata->dev->name, print_mac(mac, ifsta->bssid));
1085                                 disassoc = 1;
1086                                 sta_info_unlink(&sta);
1087                         } else
1088                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1089                                                          local->scan_ssid,
1090                                                          local->scan_ssid_len);
1091                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1092                 } else {
1093                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1094                         if (time_after(jiffies, ifsta->last_probe +
1095                                        IEEE80211_PROBE_INTERVAL)) {
1096                                 ifsta->last_probe = jiffies;
1097                                 ieee80211_send_probe_req(sdata, ifsta->bssid,
1098                                                          ifsta->ssid,
1099                                                          ifsta->ssid_len);
1100                         }
1101                 }
1102         }
1103
1104         rcu_read_unlock();
1105
1106         if (disassoc && sta)
1107                 sta_info_destroy(sta);
1108
1109         if (disassoc) {
1110                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
1111                 ieee80211_set_associated(sdata, ifsta, 0);
1112         } else {
1113                 mod_timer(&ifsta->timer, jiffies +
1114                                       IEEE80211_MONITORING_INTERVAL);
1115         }
1116 }
1117
1118
1119 static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1120                                      u8 *ssid, size_t ssid_len)
1121 {
1122         struct ieee80211_local *local = sdata->local;
1123         struct ieee80211_supported_band *sband;
1124         struct sk_buff *skb;
1125         struct ieee80211_mgmt *mgmt;
1126         u8 *pos, *supp_rates, *esupp_rates = NULL;
1127         int i;
1128
1129         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
1130         if (!skb) {
1131                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
1132                        "request\n", sdata->dev->name);
1133                 return;
1134         }
1135         skb_reserve(skb, local->hw.extra_tx_headroom);
1136
1137         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1138         memset(mgmt, 0, 24);
1139         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1140                                           IEEE80211_STYPE_PROBE_REQ);
1141         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1142         if (dst) {
1143                 memcpy(mgmt->da, dst, ETH_ALEN);
1144                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1145         } else {
1146                 memset(mgmt->da, 0xff, ETH_ALEN);
1147                 memset(mgmt->bssid, 0xff, ETH_ALEN);
1148         }
1149         pos = skb_put(skb, 2 + ssid_len);
1150         *pos++ = WLAN_EID_SSID;
1151         *pos++ = ssid_len;
1152         memcpy(pos, ssid, ssid_len);
1153
1154         supp_rates = skb_put(skb, 2);
1155         supp_rates[0] = WLAN_EID_SUPP_RATES;
1156         supp_rates[1] = 0;
1157         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1158
1159         for (i = 0; i < sband->n_bitrates; i++) {
1160                 struct ieee80211_rate *rate = &sband->bitrates[i];
1161                 if (esupp_rates) {
1162                         pos = skb_put(skb, 1);
1163                         esupp_rates[1]++;
1164                 } else if (supp_rates[1] == 8) {
1165                         esupp_rates = skb_put(skb, 3);
1166                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
1167                         esupp_rates[1] = 1;
1168                         pos = &esupp_rates[2];
1169                 } else {
1170                         pos = skb_put(skb, 1);
1171                         supp_rates[1]++;
1172                 }
1173                 *pos = rate->bitrate / 5;
1174         }
1175
1176         ieee80211_sta_tx(sdata, skb, 0);
1177 }
1178
1179
1180 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1181 {
1182         if (!sdata || !sdata->default_key ||
1183             sdata->default_key->conf.alg != ALG_WEP)
1184                 return 0;
1185         return 1;
1186 }
1187
1188
1189 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1190                                      struct ieee80211_if_sta *ifsta)
1191 {
1192         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1193         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1194         ieee80211_associate(sdata, ifsta);
1195 }
1196
1197
1198 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1199                                      struct ieee80211_if_sta *ifsta,
1200                                      struct ieee80211_mgmt *mgmt,
1201                                      size_t len)
1202 {
1203         u8 *pos;
1204         struct ieee802_11_elems elems;
1205
1206         pos = mgmt->u.auth.variable;
1207         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1208         if (!elems.challenge)
1209                 return;
1210         ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1211                             elems.challenge_len + 2, 1);
1212 }
1213
1214 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
1215                                         u8 dialog_token, u16 status, u16 policy,
1216                                         u16 buf_size, u16 timeout)
1217 {
1218         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1219         struct ieee80211_local *local = sdata->local;
1220         struct sk_buff *skb;
1221         struct ieee80211_mgmt *mgmt;
1222         u16 capab;
1223
1224         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1225
1226         if (!skb) {
1227                 printk(KERN_DEBUG "%s: failed to allocate buffer "
1228                        "for addba resp frame\n", sdata->dev->name);
1229                 return;
1230         }
1231
1232         skb_reserve(skb, local->hw.extra_tx_headroom);
1233         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1234         memset(mgmt, 0, 24);
1235         memcpy(mgmt->da, da, ETH_ALEN);
1236         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1237         if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1238                 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1239         else
1240                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1241         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1242                                           IEEE80211_STYPE_ACTION);
1243
1244         skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1245         mgmt->u.action.category = WLAN_CATEGORY_BACK;
1246         mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1247         mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1248
1249         capab = (u16)(policy << 1);     /* bit 1 aggregation policy */
1250         capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
1251         capab |= (u16)(buf_size << 6);  /* bit 15:6 max size of aggregation */
1252
1253         mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1254         mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1255         mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1256
1257         ieee80211_sta_tx(sdata, skb, 0);
1258
1259         return;
1260 }
1261
1262 void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, const u8 *da,
1263                                 u16 tid, u8 dialog_token, u16 start_seq_num,
1264                                 u16 agg_size, u16 timeout)
1265 {
1266         struct ieee80211_local *local = sdata->local;
1267         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1268         struct sk_buff *skb;
1269         struct ieee80211_mgmt *mgmt;
1270         u16 capab;
1271
1272         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1273
1274         if (!skb) {
1275                 printk(KERN_ERR "%s: failed to allocate buffer "
1276                                 "for addba request frame\n", sdata->dev->name);
1277                 return;
1278         }
1279         skb_reserve(skb, local->hw.extra_tx_headroom);
1280         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1281         memset(mgmt, 0, 24);
1282         memcpy(mgmt->da, da, ETH_ALEN);
1283         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1284         if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1285                 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1286         else
1287                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1288
1289         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1290                                           IEEE80211_STYPE_ACTION);
1291
1292         skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
1293
1294         mgmt->u.action.category = WLAN_CATEGORY_BACK;
1295         mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
1296
1297         mgmt->u.action.u.addba_req.dialog_token = dialog_token;
1298         capab = (u16)(1 << 1);          /* bit 1 aggregation policy */
1299         capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
1300         capab |= (u16)(agg_size << 6);  /* bit 15:6 max size of aggergation */
1301
1302         mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
1303
1304         mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
1305         mgmt->u.action.u.addba_req.start_seq_num =
1306                                         cpu_to_le16(start_seq_num << 4);
1307
1308         ieee80211_sta_tx(sdata, skb, 0);
1309 }
1310
1311 static void ieee80211_sta_process_addba_request(struct ieee80211_local *local,
1312                                                 struct ieee80211_mgmt *mgmt,
1313                                                 size_t len)
1314 {
1315         struct ieee80211_hw *hw = &local->hw;
1316         struct ieee80211_conf *conf = &hw->conf;
1317         struct sta_info *sta;
1318         struct tid_ampdu_rx *tid_agg_rx;
1319         u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1320         u8 dialog_token;
1321         int ret = -EOPNOTSUPP;
1322         DECLARE_MAC_BUF(mac);
1323
1324         rcu_read_lock();
1325
1326         sta = sta_info_get(local, mgmt->sa);
1327         if (!sta) {
1328                 rcu_read_unlock();
1329                 return;
1330         }
1331
1332         /* extract session parameters from addba request frame */
1333         dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1334         timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1335         start_seq_num =
1336                 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1337
1338         capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1339         ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1340         tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1341         buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1342
1343         status = WLAN_STATUS_REQUEST_DECLINED;
1344
1345         /* sanity check for incoming parameters:
1346          * check if configuration can support the BA policy
1347          * and if buffer size does not exceeds max value */
1348         if (((ba_policy != 1)
1349                 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1350                 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1351                 status = WLAN_STATUS_INVALID_QOS_PARAM;
1352 #ifdef CONFIG_MAC80211_HT_DEBUG
1353                 if (net_ratelimit())
1354                         printk(KERN_DEBUG "AddBA Req with bad params from "
1355                                 "%s on tid %u. policy %d, buffer size %d\n",
1356                                 print_mac(mac, mgmt->sa), tid, ba_policy,
1357                                 buf_size);
1358 #endif /* CONFIG_MAC80211_HT_DEBUG */
1359                 goto end_no_lock;
1360         }
1361         /* determine default buffer size */
1362         if (buf_size == 0) {
1363                 struct ieee80211_supported_band *sband;
1364
1365                 sband = local->hw.wiphy->bands[conf->channel->band];
1366                 buf_size = IEEE80211_MIN_AMPDU_BUF;
1367                 buf_size = buf_size << sband->ht_info.ampdu_factor;
1368         }
1369
1370
1371         /* examine state machine */
1372         spin_lock_bh(&sta->lock);
1373
1374         if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1375 #ifdef CONFIG_MAC80211_HT_DEBUG
1376                 if (net_ratelimit())
1377                         printk(KERN_DEBUG "unexpected AddBA Req from "
1378                                 "%s on tid %u\n",
1379                                 print_mac(mac, mgmt->sa), tid);
1380 #endif /* CONFIG_MAC80211_HT_DEBUG */
1381                 goto end;
1382         }
1383
1384         /* prepare A-MPDU MLME for Rx aggregation */
1385         sta->ampdu_mlme.tid_rx[tid] =
1386                         kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
1387         if (!sta->ampdu_mlme.tid_rx[tid]) {
1388 #ifdef CONFIG_MAC80211_HT_DEBUG
1389                 if (net_ratelimit())
1390                         printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
1391                                         tid);
1392 #endif
1393                 goto end;
1394         }
1395         /* rx timer */
1396         sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
1397                                 sta_rx_agg_session_timer_expired;
1398         sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
1399                                 (unsigned long)&sta->timer_to_tid[tid];
1400         init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1401
1402         tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
1403
1404         /* prepare reordering buffer */
1405         tid_agg_rx->reorder_buf =
1406                 kmalloc(buf_size * sizeof(struct sk_buff *), GFP_ATOMIC);
1407         if (!tid_agg_rx->reorder_buf) {
1408 #ifdef CONFIG_MAC80211_HT_DEBUG
1409                 if (net_ratelimit())
1410                         printk(KERN_ERR "can not allocate reordering buffer "
1411                                "to tid %d\n", tid);
1412 #endif
1413                 kfree(sta->ampdu_mlme.tid_rx[tid]);
1414                 goto end;
1415         }
1416         memset(tid_agg_rx->reorder_buf, 0,
1417                 buf_size * sizeof(struct sk_buff *));
1418
1419         if (local->ops->ampdu_action)
1420                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1421                                                sta->addr, tid, &start_seq_num);
1422 #ifdef CONFIG_MAC80211_HT_DEBUG
1423         printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1424 #endif /* CONFIG_MAC80211_HT_DEBUG */
1425
1426         if (ret) {
1427                 kfree(tid_agg_rx->reorder_buf);
1428                 kfree(tid_agg_rx);
1429                 sta->ampdu_mlme.tid_rx[tid] = NULL;
1430                 goto end;
1431         }
1432
1433         /* change state and send addba resp */
1434         sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1435         tid_agg_rx->dialog_token = dialog_token;
1436         tid_agg_rx->ssn = start_seq_num;
1437         tid_agg_rx->head_seq_num = start_seq_num;
1438         tid_agg_rx->buf_size = buf_size;
1439         tid_agg_rx->timeout = timeout;
1440         tid_agg_rx->stored_mpdu_num = 0;
1441         status = WLAN_STATUS_SUCCESS;
1442 end:
1443         spin_unlock_bh(&sta->lock);
1444
1445 end_no_lock:
1446         ieee80211_send_addba_resp(sta->sdata, sta->addr, tid,
1447                                   dialog_token, status, 1, buf_size, timeout);
1448         rcu_read_unlock();
1449 }
1450
1451 static void ieee80211_sta_process_addba_resp(struct ieee80211_local *local,
1452                                              struct ieee80211_mgmt *mgmt,
1453                                              size_t len)
1454 {
1455         struct ieee80211_hw *hw = &local->hw;
1456         struct sta_info *sta;
1457         u16 capab;
1458         u16 tid;
1459         u8 *state;
1460
1461         rcu_read_lock();
1462
1463         sta = sta_info_get(local, mgmt->sa);
1464         if (!sta) {
1465                 rcu_read_unlock();
1466                 return;
1467         }
1468
1469         capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
1470         tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1471
1472         state = &sta->ampdu_mlme.tid_state_tx[tid];
1473
1474         spin_lock_bh(&sta->lock);
1475
1476         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1477                 spin_unlock_bh(&sta->lock);
1478                 goto addba_resp_exit;
1479         }
1480
1481         if (mgmt->u.action.u.addba_resp.dialog_token !=
1482                 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1483                 spin_unlock_bh(&sta->lock);
1484 #ifdef CONFIG_MAC80211_HT_DEBUG
1485                 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
1486 #endif /* CONFIG_MAC80211_HT_DEBUG */
1487                 goto addba_resp_exit;
1488         }
1489
1490         del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1491 #ifdef CONFIG_MAC80211_HT_DEBUG
1492         printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
1493 #endif /* CONFIG_MAC80211_HT_DEBUG */
1494         if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1495                         == WLAN_STATUS_SUCCESS) {
1496                 *state |= HT_ADDBA_RECEIVED_MSK;
1497                 sta->ampdu_mlme.addba_req_num[tid] = 0;
1498
1499                 if (*state == HT_AGG_STATE_OPERATIONAL)
1500                         ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
1501
1502                 spin_unlock_bh(&sta->lock);
1503         } else {
1504                 sta->ampdu_mlme.addba_req_num[tid]++;
1505                 /* this will allow the state check in stop_BA_session */
1506                 *state = HT_AGG_STATE_OPERATIONAL;
1507                 spin_unlock_bh(&sta->lock);
1508                 ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
1509                                              WLAN_BACK_INITIATOR);
1510         }
1511
1512 addba_resp_exit:
1513         rcu_read_unlock();
1514 }
1515
1516 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, const u8 *da, u16 tid,
1517                           u16 initiator, u16 reason_code)
1518 {
1519         struct ieee80211_local *local = sdata->local;
1520         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1521         struct sk_buff *skb;
1522         struct ieee80211_mgmt *mgmt;
1523         u16 params;
1524
1525         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1526
1527         if (!skb) {
1528                 printk(KERN_ERR "%s: failed to allocate buffer "
1529                                         "for delba frame\n", sdata->dev->name);
1530                 return;
1531         }
1532
1533         skb_reserve(skb, local->hw.extra_tx_headroom);
1534         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1535         memset(mgmt, 0, 24);
1536         memcpy(mgmt->da, da, ETH_ALEN);
1537         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
1538         if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1539                 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
1540         else
1541                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1542         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1543                                           IEEE80211_STYPE_ACTION);
1544
1545         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1546
1547         mgmt->u.action.category = WLAN_CATEGORY_BACK;
1548         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1549         params = (u16)(initiator << 11);        /* bit 11 initiator */
1550         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
1551
1552         mgmt->u.action.u.delba.params = cpu_to_le16(params);
1553         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1554
1555         ieee80211_sta_tx(sdata, skb, 0);
1556 }
1557
1558 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
1559 {
1560         struct ieee80211_local *local = sdata->local;
1561         struct sk_buff *skb;
1562         struct ieee80211_bar *bar;
1563         u16 bar_control = 0;
1564
1565         skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
1566         if (!skb) {
1567                 printk(KERN_ERR "%s: failed to allocate buffer for "
1568                         "bar frame\n", sdata->dev->name);
1569                 return;
1570         }
1571         skb_reserve(skb, local->hw.extra_tx_headroom);
1572         bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
1573         memset(bar, 0, sizeof(*bar));
1574         bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
1575                                          IEEE80211_STYPE_BACK_REQ);
1576         memcpy(bar->ra, ra, ETH_ALEN);
1577         memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN);
1578         bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
1579         bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
1580         bar_control |= (u16)(tid << 12);
1581         bar->control = cpu_to_le16(bar_control);
1582         bar->start_seq_num = cpu_to_le16(ssn);
1583
1584         ieee80211_sta_tx(sdata, skb, 0);
1585 }
1586
1587 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
1588                                         u16 initiator, u16 reason)
1589 {
1590         struct ieee80211_local *local = sdata->local;
1591         struct ieee80211_hw *hw = &local->hw;
1592         struct sta_info *sta;
1593         int ret, i;
1594         DECLARE_MAC_BUF(mac);
1595
1596         rcu_read_lock();
1597
1598         sta = sta_info_get(local, ra);
1599         if (!sta) {
1600                 rcu_read_unlock();
1601                 return;
1602         }
1603
1604         /* check if TID is in operational state */
1605         spin_lock_bh(&sta->lock);
1606         if (sta->ampdu_mlme.tid_state_rx[tid]
1607                                 != HT_AGG_STATE_OPERATIONAL) {
1608                 spin_unlock_bh(&sta->lock);
1609                 rcu_read_unlock();
1610                 return;
1611         }
1612         sta->ampdu_mlme.tid_state_rx[tid] =
1613                 HT_AGG_STATE_REQ_STOP_BA_MSK |
1614                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1615         spin_unlock_bh(&sta->lock);
1616
1617         /* stop HW Rx aggregation. ampdu_action existence
1618          * already verified in session init so we add the BUG_ON */
1619         BUG_ON(!local->ops->ampdu_action);
1620
1621 #ifdef CONFIG_MAC80211_HT_DEBUG
1622         printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
1623                                 print_mac(mac, ra), tid);
1624 #endif /* CONFIG_MAC80211_HT_DEBUG */
1625
1626         ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1627                                         ra, tid, NULL);
1628         if (ret)
1629                 printk(KERN_DEBUG "HW problem - can not stop rx "
1630                                 "aggregation for tid %d\n", tid);
1631
1632         /* shutdown timer has not expired */
1633         if (initiator != WLAN_BACK_TIMER)
1634                 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1635
1636         /* check if this is a self generated aggregation halt */
1637         if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1638                 ieee80211_send_delba(sdata, ra, tid, 0, reason);
1639
1640         /* free the reordering buffer */
1641         for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
1642                 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
1643                         /* release the reordered frames */
1644                         dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
1645                         sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
1646                         sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
1647                 }
1648         }
1649         /* free resources */
1650         kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
1651         kfree(sta->ampdu_mlme.tid_rx[tid]);
1652         sta->ampdu_mlme.tid_rx[tid] = NULL;
1653         sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
1654
1655         rcu_read_unlock();
1656 }
1657
1658
1659 static void ieee80211_sta_process_delba(struct ieee80211_sub_if_data *sdata,
1660                         struct ieee80211_mgmt *mgmt, size_t len)
1661 {
1662         struct ieee80211_local *local = sdata->local;
1663         struct sta_info *sta;
1664         u16 tid, params;
1665         u16 initiator;
1666         DECLARE_MAC_BUF(mac);
1667
1668         rcu_read_lock();
1669
1670         sta = sta_info_get(local, mgmt->sa);
1671         if (!sta) {
1672                 rcu_read_unlock();
1673                 return;
1674         }
1675
1676         params = le16_to_cpu(mgmt->u.action.u.delba.params);
1677         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1678         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1679
1680 #ifdef CONFIG_MAC80211_HT_DEBUG
1681         if (net_ratelimit())
1682                 printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
1683                         print_mac(mac, mgmt->sa),
1684                         initiator ? "initiator" : "recipient", tid,
1685                         mgmt->u.action.u.delba.reason_code);
1686 #endif /* CONFIG_MAC80211_HT_DEBUG */
1687
1688         if (initiator == WLAN_BACK_INITIATOR)
1689                 ieee80211_sta_stop_rx_ba_session(sdata, sta->addr, tid,
1690                                                  WLAN_BACK_INITIATOR, 0);
1691         else { /* WLAN_BACK_RECIPIENT */
1692                 spin_lock_bh(&sta->lock);
1693                 sta->ampdu_mlme.tid_state_tx[tid] =
1694                                 HT_AGG_STATE_OPERATIONAL;
1695                 spin_unlock_bh(&sta->lock);
1696                 ieee80211_stop_tx_ba_session(&local->hw, sta->addr, tid,
1697                                              WLAN_BACK_RECIPIENT);
1698         }
1699         rcu_read_unlock();
1700 }
1701
1702 /*
1703  * After sending add Block Ack request we activated a timer until
1704  * add Block Ack response will arrive from the recipient.
1705  * If this timer expires sta_addba_resp_timer_expired will be executed.
1706  */
1707 void sta_addba_resp_timer_expired(unsigned long data)
1708 {
1709         /* not an elegant detour, but there is no choice as the timer passes
1710          * only one argument, and both sta_info and TID are needed, so init
1711          * flow in sta_info_create gives the TID as data, while the timer_to_id
1712          * array gives the sta through container_of */
1713         u16 tid = *(u8 *)data;
1714         struct sta_info *temp_sta = container_of((void *)data,
1715                 struct sta_info, timer_to_tid[tid]);
1716
1717         struct ieee80211_local *local = temp_sta->local;
1718         struct ieee80211_hw *hw = &local->hw;
1719         struct sta_info *sta;
1720         u8 *state;
1721
1722         rcu_read_lock();
1723
1724         sta = sta_info_get(local, temp_sta->addr);
1725         if (!sta) {
1726                 rcu_read_unlock();
1727                 return;
1728         }
1729
1730         state = &sta->ampdu_mlme.tid_state_tx[tid];
1731         /* check if the TID waits for addBA response */
1732         spin_lock_bh(&sta->lock);
1733         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1734                 spin_unlock_bh(&sta->lock);
1735                 *state = HT_AGG_STATE_IDLE;
1736 #ifdef CONFIG_MAC80211_HT_DEBUG
1737                 printk(KERN_DEBUG "timer expired on tid %d but we are not "
1738                                 "expecting addBA response there", tid);
1739 #endif
1740                 goto timer_expired_exit;
1741         }
1742
1743 #ifdef CONFIG_MAC80211_HT_DEBUG
1744         printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
1745 #endif
1746
1747         /* go through the state check in stop_BA_session */
1748         *state = HT_AGG_STATE_OPERATIONAL;
1749         spin_unlock_bh(&sta->lock);
1750         ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
1751                                      WLAN_BACK_INITIATOR);
1752
1753 timer_expired_exit:
1754         rcu_read_unlock();
1755 }
1756
1757 /*
1758  * After accepting the AddBA Request we activated a timer,
1759  * resetting it after each frame that arrives from the originator.
1760  * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1761  */
1762 static void sta_rx_agg_session_timer_expired(unsigned long data)
1763 {
1764         /* not an elegant detour, but there is no choice as the timer passes
1765          * only one argument, and various sta_info are needed here, so init
1766          * flow in sta_info_create gives the TID as data, while the timer_to_id
1767          * array gives the sta through container_of */
1768         u8 *ptid = (u8 *)data;
1769         u8 *timer_to_id = ptid - *ptid;
1770         struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1771                                          timer_to_tid[0]);
1772
1773 #ifdef CONFIG_MAC80211_HT_DEBUG
1774         printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1775 #endif
1776         ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->addr,
1777                                          (u16)*ptid, WLAN_BACK_TIMER,
1778                                          WLAN_REASON_QSTA_TIMEOUT);
1779 }
1780
1781 void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr)
1782 {
1783         struct ieee80211_local *local = sdata->local;
1784         int i;
1785
1786         for (i = 0; i <  STA_TID_NUM; i++) {
1787                 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
1788                                              WLAN_BACK_INITIATOR);
1789                 ieee80211_sta_stop_rx_ba_session(sdata, addr, i,
1790                                                  WLAN_BACK_RECIPIENT,
1791                                                  WLAN_REASON_QSTA_LEAVE_QBSS);
1792         }
1793 }
1794
1795 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
1796                                         struct ieee80211_msrment_ie *request_ie,
1797                                         const u8 *da, const u8 *bssid,
1798                                         u8 dialog_token)
1799 {
1800         struct ieee80211_local *local = sdata->local;
1801         struct sk_buff *skb;
1802         struct ieee80211_mgmt *msr_report;
1803
1804         skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
1805                                 sizeof(struct ieee80211_msrment_ie));
1806
1807         if (!skb) {
1808                 printk(KERN_ERR "%s: failed to allocate buffer for "
1809                                 "measurement report frame\n", sdata->dev->name);
1810                 return;
1811         }
1812
1813         skb_reserve(skb, local->hw.extra_tx_headroom);
1814         msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
1815         memset(msr_report, 0, 24);
1816         memcpy(msr_report->da, da, ETH_ALEN);
1817         memcpy(msr_report->sa, sdata->dev->dev_addr, ETH_ALEN);
1818         memcpy(msr_report->bssid, bssid, ETH_ALEN);
1819         msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1820                                                 IEEE80211_STYPE_ACTION);
1821
1822         skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
1823         msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
1824         msr_report->u.action.u.measurement.action_code =
1825                                 WLAN_ACTION_SPCT_MSR_RPRT;
1826         msr_report->u.action.u.measurement.dialog_token = dialog_token;
1827
1828         msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
1829         msr_report->u.action.u.measurement.length =
1830                         sizeof(struct ieee80211_msrment_ie);
1831
1832         memset(&msr_report->u.action.u.measurement.msr_elem, 0,
1833                 sizeof(struct ieee80211_msrment_ie));
1834         msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
1835         msr_report->u.action.u.measurement.msr_elem.mode |=
1836                         IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
1837         msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
1838
1839         ieee80211_sta_tx(sdata, skb, 0);
1840 }
1841
1842 static void ieee80211_sta_process_measurement_req(struct ieee80211_sub_if_data *sdata,
1843                                                 struct ieee80211_mgmt *mgmt,
1844                                                 size_t len)
1845 {
1846         /*
1847          * Ignoring measurement request is spec violation.
1848          * Mandatory measurements must be reported optional
1849          * measurements might be refused or reported incapable
1850          * For now just refuse
1851          * TODO: Answer basic measurement as unmeasured
1852          */
1853         ieee80211_send_refuse_measurement_request(sdata,
1854                         &mgmt->u.action.u.measurement.msr_elem,
1855                         mgmt->sa, mgmt->bssid,
1856                         mgmt->u.action.u.measurement.dialog_token);
1857 }
1858
1859
1860 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1861                                    struct ieee80211_if_sta *ifsta,
1862                                    struct ieee80211_mgmt *mgmt,
1863                                    size_t len)
1864 {
1865         u16 auth_alg, auth_transaction, status_code;
1866         DECLARE_MAC_BUF(mac);
1867
1868         if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1869             sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
1870                 return;
1871
1872         if (len < 24 + 6)
1873                 return;
1874
1875         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1876             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1877                 return;
1878
1879         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1880             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1881                 return;
1882
1883         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1884         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1885         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1886
1887         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1888                 /*
1889                  * IEEE 802.11 standard does not require authentication in IBSS
1890                  * networks and most implementations do not seem to use it.
1891                  * However, try to reply to authentication attempts if someone
1892                  * has actually implemented this.
1893                  */
1894                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1895                         return;
1896                 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1897         }
1898
1899         if (auth_alg != ifsta->auth_alg ||
1900             auth_transaction != ifsta->auth_transaction)
1901                 return;
1902
1903         if (status_code != WLAN_STATUS_SUCCESS) {
1904                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1905                         u8 algs[3];
1906                         const int num_algs = ARRAY_SIZE(algs);
1907                         int i, pos;
1908                         algs[0] = algs[1] = algs[2] = 0xff;
1909                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1910                                 algs[0] = WLAN_AUTH_OPEN;
1911                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1912                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1913                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1914                                 algs[2] = WLAN_AUTH_LEAP;
1915                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1916                                 pos = 0;
1917                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1918                                 pos = 1;
1919                         else
1920                                 pos = 2;
1921                         for (i = 0; i < num_algs; i++) {
1922                                 pos++;
1923                                 if (pos >= num_algs)
1924                                         pos = 0;
1925                                 if (algs[pos] == ifsta->auth_alg ||
1926                                     algs[pos] == 0xff)
1927                                         continue;
1928                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1929                                     !ieee80211_sta_wep_configured(sdata))
1930                                         continue;
1931                                 ifsta->auth_alg = algs[pos];
1932                                 break;
1933                         }
1934                 }
1935                 return;
1936         }
1937
1938         switch (ifsta->auth_alg) {
1939         case WLAN_AUTH_OPEN:
1940         case WLAN_AUTH_LEAP:
1941                 ieee80211_auth_completed(sdata, ifsta);
1942                 break;
1943         case WLAN_AUTH_SHARED_KEY:
1944                 if (ifsta->auth_transaction == 4)
1945                         ieee80211_auth_completed(sdata, ifsta);
1946                 else
1947                         ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1948                 break;
1949         }
1950 }
1951
1952
1953 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1954                                      struct ieee80211_if_sta *ifsta,
1955                                      struct ieee80211_mgmt *mgmt,
1956                                      size_t len)
1957 {
1958         u16 reason_code;
1959         DECLARE_MAC_BUF(mac);
1960
1961         if (len < 24 + 2)
1962                 return;
1963
1964         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1965                 return;
1966
1967         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1968
1969         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1970                 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1971
1972         if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1973             ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
1974             ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1975                 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1976                 mod_timer(&ifsta->timer, jiffies +
1977                                       IEEE80211_RETRY_AUTH_INTERVAL);
1978         }
1979
1980         ieee80211_set_disassoc(sdata, ifsta, 1);
1981         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1982 }
1983
1984
1985 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1986                                        struct ieee80211_if_sta *ifsta,
1987                                        struct ieee80211_mgmt *mgmt,
1988                                        size_t len)
1989 {
1990         u16 reason_code;
1991         DECLARE_MAC_BUF(mac);
1992
1993         if (len < 24 + 2)
1994                 return;
1995
1996         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1997                 return;
1998
1999         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2000
2001         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
2002                 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
2003
2004         if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
2005                 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
2006                 mod_timer(&ifsta->timer, jiffies +
2007                                       IEEE80211_RETRY_AUTH_INTERVAL);
2008         }
2009
2010         ieee80211_set_disassoc(sdata, ifsta, 0);
2011 }
2012
2013
2014 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2015                                          struct ieee80211_if_sta *ifsta,
2016                                          struct ieee80211_mgmt *mgmt,
2017                                          size_t len,
2018                                          int reassoc)
2019 {
2020         struct ieee80211_local *local = sdata->local;
2021         struct ieee80211_supported_band *sband;
2022         struct sta_info *sta;
2023         u64 rates, basic_rates;
2024         u16 capab_info, status_code, aid;
2025         struct ieee802_11_elems elems;
2026         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
2027         u8 *pos;
2028         int i, j;
2029         DECLARE_MAC_BUF(mac);
2030         bool have_higher_than_11mbit = false;
2031
2032         /* AssocResp and ReassocResp have identical structure, so process both
2033          * of them in this function. */
2034
2035         if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
2036                 return;
2037
2038         if (len < 24 + 6)
2039                 return;
2040
2041         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
2042                 return;
2043
2044         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2045         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2046         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2047
2048         printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
2049                "status=%d aid=%d)\n",
2050                sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
2051                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2052
2053         if (status_code != WLAN_STATUS_SUCCESS) {
2054                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
2055                        sdata->dev->name, status_code);
2056                 /* if this was a reassociation, ensure we try a "full"
2057                  * association next time. This works around some broken APs
2058                  * which do not correctly reject reassociation requests. */
2059                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2060                 return;
2061         }
2062
2063         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2064                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
2065                        "set\n", sdata->dev->name, aid);
2066         aid &= ~(BIT(15) | BIT(14));
2067
2068         pos = mgmt->u.assoc_resp.variable;
2069         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2070
2071         if (!elems.supp_rates) {
2072                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2073                        sdata->dev->name);
2074                 return;
2075         }
2076
2077         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
2078         ifsta->aid = aid;
2079         ifsta->ap_capab = capab_info;
2080
2081         kfree(ifsta->assocresp_ies);
2082         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
2083         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
2084         if (ifsta->assocresp_ies)
2085                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
2086
2087         rcu_read_lock();
2088
2089         /* Add STA entry for the AP */
2090         sta = sta_info_get(local, ifsta->bssid);
2091         if (!sta) {
2092                 struct ieee80211_sta_bss *bss;
2093                 int err;
2094
2095                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
2096                 if (!sta) {
2097                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
2098                                " the AP\n", sdata->dev->name);
2099                         rcu_read_unlock();
2100                         return;
2101                 }
2102                 bss = ieee80211_rx_bss_get(local, ifsta->bssid,
2103                                            local->hw.conf.channel->center_freq,
2104                                            ifsta->ssid, ifsta->ssid_len);
2105                 if (bss) {
2106                         sta->last_signal = bss->signal;
2107                         sta->last_qual = bss->qual;
2108                         sta->last_noise = bss->noise;
2109                         ieee80211_rx_bss_put(local, bss);
2110                 }
2111
2112                 err = sta_info_insert(sta);
2113                 if (err) {
2114                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
2115                                " the AP (error %d)\n", sdata->dev->name, err);
2116                         rcu_read_unlock();
2117                         return;
2118                 }
2119                 /* update new sta with its last rx activity */
2120                 sta->last_rx = jiffies;
2121         }
2122
2123         /*
2124          * FIXME: Do we really need to update the sta_info's information here?
2125          *        We already know about the AP (we found it in our list) so it
2126          *        should already be filled with the right info, no?
2127          *        As is stands, all this is racy because typically we assume
2128          *        the information that is filled in here (except flags) doesn't
2129          *        change while a STA structure is alive. As such, it should move
2130          *        to between the sta_info_alloc() and sta_info_insert() above.
2131          */
2132
2133         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
2134                            WLAN_STA_AUTHORIZED);
2135
2136         rates = 0;
2137         basic_rates = 0;
2138         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2139
2140         for (i = 0; i < elems.supp_rates_len; i++) {
2141                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
2142
2143                 if (rate > 110)
2144                         have_higher_than_11mbit = true;
2145
2146                 for (j = 0; j < sband->n_bitrates; j++) {
2147                         if (sband->bitrates[j].bitrate == rate)
2148                                 rates |= BIT(j);
2149                         if (elems.supp_rates[i] & 0x80)
2150                                 basic_rates |= BIT(j);
2151                 }
2152         }
2153
2154         for (i = 0; i < elems.ext_supp_rates_len; i++) {
2155                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
2156
2157                 if (rate > 110)
2158                         have_higher_than_11mbit = true;
2159
2160                 for (j = 0; j < sband->n_bitrates; j++) {
2161                         if (sband->bitrates[j].bitrate == rate)
2162                                 rates |= BIT(j);
2163                         if (elems.ext_supp_rates[i] & 0x80)
2164                                 basic_rates |= BIT(j);
2165                 }
2166         }
2167
2168         sta->supp_rates[local->hw.conf.channel->band] = rates;
2169         sdata->basic_rates = basic_rates;
2170
2171         /* cf. IEEE 802.11 9.2.12 */
2172         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
2173             have_higher_than_11mbit)
2174                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2175         else
2176                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2177
2178         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2179             (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2180                 struct ieee80211_ht_bss_info bss_info;
2181                 ieee80211_ht_cap_ie_to_ht_info(
2182                                 (struct ieee80211_ht_cap *)
2183                                 elems.ht_cap_elem, &sta->ht_info);
2184                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2185                                 (struct ieee80211_ht_addt_info *)
2186                                 elems.ht_info_elem, &bss_info);
2187                 ieee80211_handle_ht(local, 1, &sta->ht_info, &bss_info);
2188         }
2189
2190         rate_control_rate_init(sta, local);
2191
2192         if (elems.wmm_param) {
2193                 set_sta_flags(sta, WLAN_STA_WME);
2194                 rcu_read_unlock();
2195                 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2196                                          elems.wmm_param_len);
2197         } else
2198                 rcu_read_unlock();
2199
2200         /* set AID and assoc capability,
2201          * ieee80211_set_associated() will tell the driver */
2202         bss_conf->aid = aid;
2203         bss_conf->assoc_capability = capab_info;
2204         ieee80211_set_associated(sdata, ifsta, 1);
2205
2206         ieee80211_associated(sdata, ifsta);
2207 }
2208
2209
2210 /* Caller must hold local->sta_bss_lock */
2211 static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
2212                                         struct ieee80211_sta_bss *bss)
2213 {
2214         u8 hash_idx;
2215
2216         if (bss_mesh_cfg(bss))
2217                 hash_idx = mesh_id_hash(bss_mesh_id(bss),
2218                                         bss_mesh_id_len(bss));
2219         else
2220                 hash_idx = STA_HASH(bss->bssid);
2221
2222         bss->hnext = local->sta_bss_hash[hash_idx];
2223         local->sta_bss_hash[hash_idx] = bss;
2224 }
2225
2226
2227 /* Caller must hold local->sta_bss_lock */
2228 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
2229                                         struct ieee80211_sta_bss *bss)
2230 {
2231         struct ieee80211_sta_bss *b, *prev = NULL;
2232         b = local->sta_bss_hash[STA_HASH(bss->bssid)];
2233         while (b) {
2234                 if (b == bss) {
2235                         if (!prev)
2236                                 local->sta_bss_hash[STA_HASH(bss->bssid)] =
2237                                         bss->hnext;
2238                         else
2239                                 prev->hnext = bss->hnext;
2240                         break;
2241                 }
2242                 prev = b;
2243                 b = b->hnext;
2244         }
2245 }
2246
2247
2248 static struct ieee80211_sta_bss *
2249 ieee80211_rx_bss_add(struct ieee80211_sub_if_data *sdata, u8 *bssid, int freq,
2250                      u8 *ssid, u8 ssid_len)
2251 {
2252         struct ieee80211_local *local = sdata->local;
2253         struct ieee80211_sta_bss *bss;
2254
2255         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2256         if (!bss)
2257                 return NULL;
2258         atomic_inc(&bss->users);
2259         atomic_inc(&bss->users);
2260         memcpy(bss->bssid, bssid, ETH_ALEN);
2261         bss->freq = freq;
2262         if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
2263                 memcpy(bss->ssid, ssid, ssid_len);
2264                 bss->ssid_len = ssid_len;
2265         }
2266
2267         spin_lock_bh(&local->sta_bss_lock);
2268         /* TODO: order by RSSI? */
2269         list_add_tail(&bss->list, &local->sta_bss_list);
2270         __ieee80211_rx_bss_hash_add(local, bss);
2271         spin_unlock_bh(&local->sta_bss_lock);
2272         return bss;
2273 }
2274
2275 static struct ieee80211_sta_bss *
2276 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
2277                      u8 *ssid, u8 ssid_len)
2278 {
2279         struct ieee80211_sta_bss *bss;
2280
2281         spin_lock_bh(&local->sta_bss_lock);
2282         bss = local->sta_bss_hash[STA_HASH(bssid)];
2283         while (bss) {
2284                 if (!bss_mesh_cfg(bss) &&
2285                     !memcmp(bss->bssid, bssid, ETH_ALEN) &&
2286                     bss->freq == freq &&
2287                     bss->ssid_len == ssid_len &&
2288                     (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
2289                         atomic_inc(&bss->users);
2290                         break;
2291                 }
2292                 bss = bss->hnext;
2293         }
2294         spin_unlock_bh(&local->sta_bss_lock);
2295         return bss;
2296 }
2297
2298 #ifdef CONFIG_MAC80211_MESH
2299 static struct ieee80211_sta_bss *
2300 ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
2301                           u8 *mesh_cfg, int freq)
2302 {
2303         struct ieee80211_sta_bss *bss;
2304
2305         spin_lock_bh(&local->sta_bss_lock);
2306         bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
2307         while (bss) {
2308                 if (bss_mesh_cfg(bss) &&
2309                     !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
2310                     bss->freq == freq &&
2311                     mesh_id_len == bss->mesh_id_len &&
2312                     (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
2313                                                  mesh_id_len))) {
2314                         atomic_inc(&bss->users);
2315                         break;
2316                 }
2317                 bss = bss->hnext;
2318         }
2319         spin_unlock_bh(&local->sta_bss_lock);
2320         return bss;
2321 }
2322
2323 static struct ieee80211_sta_bss *
2324 ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
2325                           u8 *mesh_cfg, int mesh_config_len, int freq)
2326 {
2327         struct ieee80211_sta_bss *bss;
2328
2329         if (mesh_config_len != MESH_CFG_LEN)
2330                 return NULL;
2331
2332         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2333         if (!bss)
2334                 return NULL;
2335
2336         bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
2337         if (!bss->mesh_cfg) {
2338                 kfree(bss);
2339                 return NULL;
2340         }
2341
2342         if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
2343                 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
2344                 if (!bss->mesh_id) {
2345                         kfree(bss->mesh_cfg);
2346                         kfree(bss);
2347                         return NULL;
2348                 }
2349                 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
2350         }
2351
2352         atomic_inc(&bss->users);
2353         atomic_inc(&bss->users);
2354         memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
2355         bss->mesh_id_len = mesh_id_len;
2356         bss->freq = freq;
2357         spin_lock_bh(&local->sta_bss_lock);
2358         /* TODO: order by RSSI? */
2359         list_add_tail(&bss->list, &local->sta_bss_list);
2360         __ieee80211_rx_bss_hash_add(local, bss);
2361         spin_unlock_bh(&local->sta_bss_lock);
2362         return bss;
2363 }
2364 #endif
2365
2366 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
2367 {
2368         kfree(bss->ies);
2369         kfree(bss_mesh_id(bss));
2370         kfree(bss_mesh_cfg(bss));
2371         kfree(bss);
2372 }
2373
2374
2375 static void ieee80211_rx_bss_put(struct ieee80211_local *local,
2376                                  struct ieee80211_sta_bss *bss)
2377 {
2378         local_bh_disable();
2379         if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
2380                 local_bh_enable();
2381                 return;
2382         }
2383
2384         __ieee80211_rx_bss_hash_del(local, bss);
2385         list_del(&bss->list);
2386         spin_unlock_bh(&local->sta_bss_lock);
2387         ieee80211_rx_bss_free(bss);
2388 }
2389
2390
2391 void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
2392 {
2393         spin_lock_init(&local->sta_bss_lock);
2394         INIT_LIST_HEAD(&local->sta_bss_list);
2395 }
2396
2397
2398 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
2399 {
2400         struct ieee80211_sta_bss *bss, *tmp;
2401
2402         list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
2403                 ieee80211_rx_bss_put(local, bss);
2404 }
2405
2406
2407 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
2408                                    struct ieee80211_if_sta *ifsta,
2409                                    struct ieee80211_sta_bss *bss)
2410 {
2411         struct ieee80211_local *local = sdata->local;
2412         int res, rates, i, j;
2413         struct sk_buff *skb;
2414         struct ieee80211_mgmt *mgmt;
2415         u8 *pos;
2416         struct ieee80211_supported_band *sband;
2417         union iwreq_data wrqu;
2418
2419         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2420
2421         /* Remove possible STA entries from other IBSS networks. */
2422         sta_info_flush_delayed(sdata);
2423
2424         if (local->ops->reset_tsf) {
2425                 /* Reset own TSF to allow time synchronization work. */
2426                 local->ops->reset_tsf(local_to_hw(local));
2427         }
2428         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2429         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
2430         if (res)
2431                 return res;
2432
2433         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2434
2435         sdata->drop_unencrypted = bss->capability &
2436                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2437
2438         res = ieee80211_set_freq(sdata, bss->freq);
2439
2440         if (res)
2441                 return res;
2442
2443         /* Build IBSS probe response */
2444         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2445         if (skb) {
2446                 skb_reserve(skb, local->hw.extra_tx_headroom);
2447
2448                 mgmt = (struct ieee80211_mgmt *)
2449                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2450                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2451                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2452                                                   IEEE80211_STYPE_PROBE_RESP);
2453                 memset(mgmt->da, 0xff, ETH_ALEN);
2454                 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
2455                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2456                 mgmt->u.beacon.beacon_int =
2457                         cpu_to_le16(local->hw.conf.beacon_int);
2458                 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
2459                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2460
2461                 pos = skb_put(skb, 2 + ifsta->ssid_len);
2462                 *pos++ = WLAN_EID_SSID;
2463                 *pos++ = ifsta->ssid_len;
2464                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2465
2466                 rates = bss->supp_rates_len;
2467                 if (rates > 8)
2468                         rates = 8;
2469                 pos = skb_put(skb, 2 + rates);
2470                 *pos++ = WLAN_EID_SUPP_RATES;
2471                 *pos++ = rates;
2472                 memcpy(pos, bss->supp_rates, rates);
2473
2474                 if (bss->band == IEEE80211_BAND_2GHZ) {
2475                         pos = skb_put(skb, 2 + 1);
2476                         *pos++ = WLAN_EID_DS_PARAMS;
2477                         *pos++ = 1;
2478                         *pos++ = ieee80211_frequency_to_channel(bss->freq);
2479                 }
2480
2481                 pos = skb_put(skb, 2 + 2);
2482                 *pos++ = WLAN_EID_IBSS_PARAMS;
2483                 *pos++ = 2;
2484                 /* FIX: set ATIM window based on scan results */
2485                 *pos++ = 0;
2486                 *pos++ = 0;
2487
2488                 if (bss->supp_rates_len > 8) {
2489                         rates = bss->supp_rates_len - 8;
2490                         pos = skb_put(skb, 2 + rates);
2491                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
2492                         *pos++ = rates;
2493                         memcpy(pos, &bss->supp_rates[8], rates);
2494                 }
2495
2496                 ifsta->probe_resp = skb;
2497
2498                 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
2499         }
2500
2501         rates = 0;
2502         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2503         for (i = 0; i < bss->supp_rates_len; i++) {
2504                 int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2505                 for (j = 0; j < sband->n_bitrates; j++)
2506                         if (sband->bitrates[j].bitrate == bitrate)
2507                                 rates |= BIT(j);
2508         }
2509         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
2510
2511         ieee80211_sta_def_wmm_params(sdata, bss, 1);
2512
2513         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
2514         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2515
2516         memset(&wrqu, 0, sizeof(wrqu));
2517         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2518         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
2519
2520         return res;
2521 }
2522
2523 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
2524                             struct ieee802_11_elems *elems,
2525                             enum ieee80211_band band)
2526 {
2527         struct ieee80211_supported_band *sband;
2528         struct ieee80211_rate *bitrates;
2529         size_t num_rates;
2530         u64 supp_rates;
2531         int i, j;
2532         sband = local->hw.wiphy->bands[band];
2533
2534         if (!sband) {
2535                 WARN_ON(1);
2536                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2537         }
2538
2539         bitrates = sband->bitrates;
2540         num_rates = sband->n_bitrates;
2541         supp_rates = 0;
2542         for (i = 0; i < elems->supp_rates_len +
2543                      elems->ext_supp_rates_len; i++) {
2544                 u8 rate = 0;
2545                 int own_rate;
2546                 if (i < elems->supp_rates_len)
2547                         rate = elems->supp_rates[i];
2548                 else if (elems->ext_supp_rates)
2549                         rate = elems->ext_supp_rates
2550                                 [i - elems->supp_rates_len];
2551                 own_rate = 5 * (rate & 0x7f);
2552                 for (j = 0; j < num_rates; j++)
2553                         if (bitrates[j].bitrate == own_rate)
2554                                 supp_rates |= BIT(j);
2555         }
2556         return supp_rates;
2557 }
2558
2559 static u64 ieee80211_sta_get_mandatory_rates(struct ieee80211_local *local,
2560                                         enum ieee80211_band band)
2561 {
2562         struct ieee80211_supported_band *sband;
2563         struct ieee80211_rate *bitrates;
2564         u64 mandatory_rates;
2565         enum ieee80211_rate_flags mandatory_flag;
2566         int i;
2567
2568         sband = local->hw.wiphy->bands[band];
2569         if (!sband) {
2570                 WARN_ON(1);
2571                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2572         }
2573
2574         if (band == IEEE80211_BAND_2GHZ)
2575                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
2576         else
2577                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
2578
2579         bitrates = sband->bitrates;
2580         mandatory_rates = 0;
2581         for (i = 0; i < sband->n_bitrates; i++)
2582                 if (bitrates[i].flags & mandatory_flag)
2583                         mandatory_rates |= BIT(i);
2584         return mandatory_rates;
2585 }
2586
2587 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2588                                   struct ieee80211_mgmt *mgmt,
2589                                   size_t len,
2590                                   struct ieee80211_rx_status *rx_status,
2591                                   struct ieee802_11_elems *elems)
2592 {
2593         struct ieee80211_local *local = sdata->local;
2594         int freq, clen;
2595         struct ieee80211_sta_bss *bss;
2596         struct sta_info *sta;
2597         struct ieee80211_channel *channel;
2598         u64 beacon_timestamp, rx_timestamp;
2599         u64 supp_rates = 0;
2600         bool beacon = ieee80211_is_beacon(mgmt->frame_control);
2601         enum ieee80211_band band = rx_status->band;
2602         DECLARE_MAC_BUF(mac);
2603         DECLARE_MAC_BUF(mac2);
2604
2605         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
2606
2607         if (ieee80211_vif_is_mesh(&sdata->vif) && elems->mesh_id &&
2608             elems->mesh_config && mesh_matches_local(elems, sdata)) {
2609                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
2610
2611                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
2612                                       mesh_peer_accepts_plinks(elems));
2613         }
2614
2615         rcu_read_lock();
2616
2617         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems->supp_rates &&
2618             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
2619
2620                 supp_rates = ieee80211_sta_get_rates(local, elems, band);
2621
2622                 sta = sta_info_get(local, mgmt->sa);
2623                 if (sta) {
2624                         u64 prev_rates;
2625
2626                         prev_rates = sta->supp_rates[band];
2627                         /* make sure mandatory rates are always added */
2628                         sta->supp_rates[band] = supp_rates |
2629                                 ieee80211_sta_get_mandatory_rates(local, band);
2630
2631 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2632                         if (sta->supp_rates[band] != prev_rates)
2633                                 printk(KERN_DEBUG "%s: updated supp_rates set "
2634                                     "for %s based on beacon info (0x%llx | "
2635                                     "0x%llx -> 0x%llx)\n",
2636                                     sdata->dev->name, print_mac(mac, sta->addr),
2637                                     (unsigned long long) prev_rates,
2638                                     (unsigned long long) supp_rates,
2639                                     (unsigned long long) sta->supp_rates[band]);
2640 #endif
2641                 } else {
2642                         ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid,
2643                                                mgmt->sa, supp_rates);
2644                 }
2645         }
2646
2647         rcu_read_unlock();
2648
2649         if (elems->ds_params && elems->ds_params_len == 1)
2650                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
2651         else
2652                 freq = rx_status->freq;
2653
2654         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2655
2656         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2657                 return;
2658
2659 #ifdef CONFIG_MAC80211_MESH
2660         if (elems->mesh_config)
2661                 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
2662                                 elems->mesh_id_len, elems->mesh_config, freq);
2663         else
2664 #endif
2665                 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
2666                                            elems->ssid, elems->ssid_len);
2667         if (!bss) {
2668 #ifdef CONFIG_MAC80211_MESH
2669                 if (elems->mesh_config)
2670                         bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
2671                                 elems->mesh_id_len, elems->mesh_config,
2672                                 elems->mesh_config_len, freq);
2673                 else
2674 #endif
2675                         bss = ieee80211_rx_bss_add(sdata, mgmt->bssid, freq,
2676                                                   elems->ssid, elems->ssid_len);
2677                 if (!bss)
2678                         return;
2679         } else {
2680 #if 0
2681                 /* TODO: order by RSSI? */
2682                 spin_lock_bh(&local->sta_bss_lock);
2683                 list_move_tail(&bss->list, &local->sta_bss_list);
2684                 spin_unlock_bh(&local->sta_bss_lock);
2685 #endif
2686         }
2687
2688         /* save the ERP value so that it is available at association time */
2689         if (elems->erp_info && elems->erp_info_len >= 1) {
2690                 bss->erp_value = elems->erp_info[0];
2691                 bss->has_erp_value = 1;
2692         }
2693
2694         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
2695         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
2696
2697         if (elems->tim) {
2698                 struct ieee80211_tim_ie *tim_ie =
2699                         (struct ieee80211_tim_ie *)elems->tim;
2700                 bss->dtim_period = tim_ie->dtim_period;
2701         }
2702
2703         /* set default value for buggy APs */
2704         if (!elems->tim || bss->dtim_period == 0)
2705                 bss->dtim_period = 1;
2706
2707         bss->supp_rates_len = 0;
2708         if (elems->supp_rates) {
2709                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2710                 if (clen > elems->supp_rates_len)
2711                         clen = elems->supp_rates_len;
2712                 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
2713                        clen);
2714                 bss->supp_rates_len += clen;
2715         }
2716         if (elems->ext_supp_rates) {
2717                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2718                 if (clen > elems->ext_supp_rates_len)
2719                         clen = elems->ext_supp_rates_len;
2720                 memcpy(&bss->supp_rates[bss->supp_rates_len],
2721                        elems->ext_supp_rates, clen);
2722                 bss->supp_rates_len += clen;
2723         }
2724
2725         bss->band = band;
2726
2727         bss->timestamp = beacon_timestamp;
2728         bss->last_update = jiffies;
2729         bss->signal = rx_status->signal;
2730         bss->noise = rx_status->noise;
2731         bss->qual = rx_status->qual;
2732         if (!beacon)
2733                 bss->last_probe_resp = jiffies;
2734         /*
2735          * In STA mode, the remaining parameters should not be overridden
2736          * by beacons because they're not necessarily accurate there.
2737          */
2738         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
2739             bss->last_probe_resp && beacon) {
2740                 ieee80211_rx_bss_put(local, bss);
2741                 return;
2742         }
2743
2744         if (bss->ies == NULL || bss->ies_len < elems->total_len) {
2745                 kfree(bss->ies);
2746                 bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
2747         }
2748         if (bss->ies) {
2749                 memcpy(bss->ies, elems->ie_start, elems->total_len);
2750                 bss->ies_len = elems->total_len;
2751         } else
2752                 bss->ies_len = 0;
2753
2754         bss->wmm_used = elems->wmm_param || elems->wmm_info;
2755
2756         /* check if we need to merge IBSS */
2757         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
2758             !local->sta_sw_scanning && !local->sta_hw_scanning &&
2759             bss->capability & WLAN_CAPABILITY_IBSS &&
2760             bss->freq == local->oper_channel->center_freq &&
2761             elems->ssid_len == sdata->u.sta.ssid_len &&
2762             memcmp(elems->ssid, sdata->u.sta.ssid,
2763                                 sdata->u.sta.ssid_len) == 0) {
2764                 if (rx_status->flag & RX_FLAG_TSFT) {
2765                         /* in order for correct IBSS merging we need mactime
2766                          *
2767                          * since mactime is defined as the time the first data
2768                          * symbol of the frame hits the PHY, and the timestamp
2769                          * of the beacon is defined as "the time that the data
2770                          * symbol containing the first bit of the timestamp is
2771                          * transmitted to the PHY plus the transmitting STA’s
2772                          * delays through its local PHY from the MAC-PHY
2773                          * interface to its interface with the WM"
2774                          * (802.11 11.1.2) - equals the time this bit arrives at
2775                          * the receiver - we have to take into account the
2776                          * offset between the two.
2777                          * e.g: at 1 MBit that means mactime is 192 usec earlier
2778                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
2779                          */
2780                         int rate = local->hw.wiphy->bands[band]->
2781                                         bitrates[rx_status->rate_idx].bitrate;
2782                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
2783                 } else if (local && local->ops && local->ops->get_tsf)
2784                         /* second best option: get current TSF */
2785                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
2786                 else
2787                         /* can't merge without knowing the TSF */
2788                         rx_timestamp = -1LLU;
2789 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2790                 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
2791                        "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
2792                        print_mac(mac, mgmt->sa),
2793                        print_mac(mac2, mgmt->bssid),
2794                        (unsigned long long)rx_timestamp,
2795                        (unsigned long long)beacon_timestamp,
2796                        (unsigned long long)(rx_timestamp - beacon_timestamp),
2797                        jiffies);
2798 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2799                 if (beacon_timestamp > rx_timestamp) {
2800 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2801                         printk(KERN_DEBUG "%s: beacon TSF higher than "
2802                                "local TSF - IBSS merge with BSSID %s\n",
2803                                sdata->dev->name, print_mac(mac, mgmt->bssid));
2804 #endif
2805                         ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
2806                         ieee80211_ibss_add_sta(sdata, NULL,
2807                                                mgmt->bssid, mgmt->sa,
2808                                                supp_rates);
2809                 }
2810         }
2811
2812         ieee80211_rx_bss_put(local, bss);
2813 }
2814
2815
2816 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2817                                          struct ieee80211_mgmt *mgmt,
2818                                          size_t len,
2819                                          struct ieee80211_rx_status *rx_status)
2820 {
2821         size_t baselen;
2822         struct ieee802_11_elems elems;
2823         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2824
2825         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
2826                 return; /* ignore ProbeResp to foreign address */
2827
2828         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2829         if (baselen > len)
2830                 return;
2831
2832         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2833                                 &elems);
2834
2835         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2836
2837         /* direct probe may be part of the association flow */
2838         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
2839                                                         &ifsta->request)) {
2840                 printk(KERN_DEBUG "%s direct probe responded\n",
2841                        sdata->dev->name);
2842                 ieee80211_authenticate(sdata, ifsta);
2843         }
2844 }
2845
2846
2847 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2848                                      struct ieee80211_mgmt *mgmt,
2849                                      size_t len,
2850                                      struct ieee80211_rx_status *rx_status)
2851 {
2852         struct ieee80211_if_sta *ifsta;
2853         size_t baselen;
2854         struct ieee802_11_elems elems;
2855         struct ieee80211_local *local = sdata->local;
2856         struct ieee80211_conf *conf = &local->hw.conf;
2857         u32 changed = 0;
2858
2859         /* Process beacon from the current BSS */
2860         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2861         if (baselen > len)
2862                 return;
2863
2864         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2865
2866         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2867
2868         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2869                 return;
2870         ifsta = &sdata->u.sta;
2871
2872         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2873             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2874                 return;
2875
2876         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
2877                                  elems.wmm_param_len);
2878
2879         /* Do not send changes to driver if we are scanning. This removes
2880          * requirement that driver's bss_info_changed function needs to be
2881          * atomic. */
2882         if (local->sta_sw_scanning || local->sta_hw_scanning)
2883                 return;
2884
2885         if (elems.erp_info && elems.erp_info_len >= 1)
2886                 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2887         else {
2888                 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
2889                 changed |= ieee80211_handle_protect_preamb(sdata, false,
2890                                 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
2891         }
2892
2893         if (elems.ht_cap_elem && elems.ht_info_elem &&
2894             elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2895                 struct ieee80211_ht_bss_info bss_info;
2896
2897                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2898                                 (struct ieee80211_ht_addt_info *)
2899                                 elems.ht_info_elem, &bss_info);
2900                 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf,
2901                                                &bss_info);
2902         }
2903
2904         ieee80211_bss_info_change_notify(sdata, changed);
2905 }
2906
2907
2908 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
2909                                         struct ieee80211_if_sta *ifsta,
2910                                         struct ieee80211_mgmt *mgmt,
2911                                         size_t len,
2912                                         struct ieee80211_rx_status *rx_status)
2913 {
2914         struct ieee80211_local *local = sdata->local;
2915         int tx_last_beacon;
2916         struct sk_buff *skb;
2917         struct ieee80211_mgmt *resp;
2918         u8 *pos, *end;
2919         DECLARE_MAC_BUF(mac);
2920 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2921         DECLARE_MAC_BUF(mac2);
2922         DECLARE_MAC_BUF(mac3);
2923 #endif
2924
2925         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2926             ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
2927             len < 24 + 2 || !ifsta->probe_resp)
2928                 return;
2929
2930         if (local->ops->tx_last_beacon)
2931                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2932         else
2933                 tx_last_beacon = 1;
2934
2935 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2936         printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2937                "%s (tx_last_beacon=%d)\n",
2938                sdata->dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2939                print_mac(mac3, mgmt->bssid), tx_last_beacon);
2940 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2941
2942         if (!tx_last_beacon)
2943                 return;
2944
2945         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2946             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2947                 return;
2948
2949         end = ((u8 *) mgmt) + len;
2950         pos = mgmt->u.probe_req.variable;
2951         if (pos[0] != WLAN_EID_SSID ||
2952             pos + 2 + pos[1] > end) {
2953 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2954                 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2955                        "from %s\n",
2956                        sdata->dev->name, print_mac(mac, mgmt->sa));
2957 #endif
2958                 return;
2959         }
2960         if (pos[1] != 0 &&
2961             (pos[1] != ifsta->ssid_len ||
2962              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2963                 /* Ignore ProbeReq for foreign SSID */
2964                 return;
2965         }
2966
2967         /* Reply with ProbeResp */
2968         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2969         if (!skb)
2970                 return;
2971
2972         resp = (struct ieee80211_mgmt *) skb->data;
2973         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2974 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2975         printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
2976                sdata->dev->name, print_mac(mac, resp->da));
2977 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2978         ieee80211_sta_tx(sdata, skb, 0);
2979 }
2980
2981 static void ieee80211_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
2982                                      struct ieee80211_if_sta *ifsta,
2983                                      struct ieee80211_mgmt *mgmt,
2984                                      size_t len,
2985                                      struct ieee80211_rx_status *rx_status)
2986 {
2987         struct ieee80211_local *local = sdata->local;
2988
2989         if (len < IEEE80211_MIN_ACTION_SIZE)
2990                 return;
2991
2992         switch (mgmt->u.action.category) {
2993         case WLAN_CATEGORY_SPECTRUM_MGMT:
2994                 if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ)
2995                         break;
2996                 switch (mgmt->u.action.u.chan_switch.action_code) {
2997                 case WLAN_ACTION_SPCT_MSR_REQ:
2998                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2999                                    sizeof(mgmt->u.action.u.measurement)))
3000                                 break;
3001                         ieee80211_sta_process_measurement_req(sdata, mgmt, len);
3002                         break;
3003                 }
3004                 break;
3005         case WLAN_CATEGORY_BACK:
3006                 switch (mgmt->u.action.u.addba_req.action_code) {
3007                 case WLAN_ACTION_ADDBA_REQ:
3008                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3009                                    sizeof(mgmt->u.action.u.addba_req)))
3010                                 break;
3011                         ieee80211_sta_process_addba_request(local, mgmt, len);
3012                         break;
3013                 case WLAN_ACTION_ADDBA_RESP:
3014                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3015                                    sizeof(mgmt->u.action.u.addba_resp)))
3016                                 break;
3017                         ieee80211_sta_process_addba_resp(local, mgmt, len);
3018                         break;
3019                 case WLAN_ACTION_DELBA:
3020                         if (len < (IEEE80211_MIN_ACTION_SIZE +
3021                                    sizeof(mgmt->u.action.u.delba)))
3022                                 break;
3023                         ieee80211_sta_process_delba(sdata, mgmt, len);
3024                         break;
3025                 }
3026                 break;
3027         case PLINK_CATEGORY:
3028                 if (ieee80211_vif_is_mesh(&sdata->vif))
3029                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
3030                 break;
3031         case MESH_PATH_SEL_CATEGORY:
3032                 if (ieee80211_vif_is_mesh(&sdata->vif))
3033                         mesh_rx_path_sel_frame(sdata, mgmt, len);
3034                 break;
3035         }
3036 }
3037
3038 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
3039                            struct ieee80211_rx_status *rx_status)
3040 {
3041         struct ieee80211_local *local = sdata->local;
3042         struct ieee80211_if_sta *ifsta;
3043         struct ieee80211_mgmt *mgmt;
3044         u16 fc;
3045
3046         if (skb->len < 24)
3047                 goto fail;
3048
3049         ifsta = &sdata->u.sta;
3050
3051         mgmt = (struct ieee80211_mgmt *) skb->data;
3052         fc = le16_to_cpu(mgmt->frame_control);
3053
3054         switch (fc & IEEE80211_FCTL_STYPE) {
3055         case IEEE80211_STYPE_PROBE_REQ:
3056         case IEEE80211_STYPE_PROBE_RESP:
3057         case IEEE80211_STYPE_BEACON:
3058         case IEEE80211_STYPE_ACTION:
3059                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
3060         case IEEE80211_STYPE_AUTH:
3061         case IEEE80211_STYPE_ASSOC_RESP:
3062         case IEEE80211_STYPE_REASSOC_RESP:
3063         case IEEE80211_STYPE_DEAUTH:
3064         case IEEE80211_STYPE_DISASSOC:
3065                 skb_queue_tail(&ifsta->skb_queue, skb);
3066                 queue_work(local->hw.workqueue, &ifsta->work);
3067                 return;
3068         }
3069
3070  fail:
3071         kfree_skb(skb);
3072 }
3073
3074 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3075                                          struct sk_buff *skb)
3076 {
3077         struct ieee80211_rx_status *rx_status;
3078         struct ieee80211_if_sta *ifsta;
3079         struct ieee80211_mgmt *mgmt;
3080         u16 fc;
3081
3082         ifsta = &sdata->u.sta;
3083
3084         rx_status = (struct ieee80211_rx_status *) skb->cb;
3085         mgmt = (struct ieee80211_mgmt *) skb->data;
3086         fc = le16_to_cpu(mgmt->frame_control);
3087
3088         switch (fc & IEEE80211_FCTL_STYPE) {
3089         case IEEE80211_STYPE_PROBE_REQ:
3090                 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
3091                                             rx_status);
3092                 break;
3093         case IEEE80211_STYPE_PROBE_RESP:
3094                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
3095                 break;
3096         case IEEE80211_STYPE_BEACON:
3097                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3098                 break;
3099         case IEEE80211_STYPE_AUTH:
3100                 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
3101                 break;
3102         case IEEE80211_STYPE_ASSOC_RESP:
3103                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
3104                 break;
3105         case IEEE80211_STYPE_REASSOC_RESP:
3106                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
3107                 break;
3108         case IEEE80211_STYPE_DEAUTH:
3109                 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
3110                 break;
3111         case IEEE80211_STYPE_DISASSOC:
3112                 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
3113                 break;
3114         case IEEE80211_STYPE_ACTION:
3115                 ieee80211_rx_mgmt_action(sdata, ifsta, mgmt, skb->len, rx_status);
3116                 break;
3117         }
3118
3119         kfree_skb(skb);
3120 }
3121
3122
3123 ieee80211_rx_result
3124 ieee80211_sta_rx_scan(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
3125                       struct ieee80211_rx_status *rx_status)
3126 {
3127         struct ieee80211_mgmt *mgmt;
3128         __le16 fc;
3129
3130         if (skb->len < 2)
3131                 return RX_DROP_UNUSABLE;
3132
3133         mgmt = (struct ieee80211_mgmt *) skb->data;
3134         fc = mgmt->frame_control;
3135
3136         if (ieee80211_is_ctl(fc))
3137                 return RX_CONTINUE;
3138
3139         if (skb->len < 24)
3140                 return RX_DROP_MONITOR;
3141
3142         if (ieee80211_is_probe_resp(fc)) {
3143                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
3144                 dev_kfree_skb(skb);
3145                 return RX_QUEUED;
3146         }
3147
3148         if (ieee80211_is_beacon(fc)) {
3149                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3150                 dev_kfree_skb(skb);
3151                 return RX_QUEUED;
3152         }
3153
3154         return RX_CONTINUE;
3155 }
3156
3157
3158 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
3159 {
3160         struct ieee80211_local *local = sdata->local;
3161         int active = 0;
3162         struct sta_info *sta;
3163
3164         rcu_read_lock();
3165
3166         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3167                 if (sta->sdata == sdata &&
3168                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
3169                                jiffies)) {
3170                         active++;
3171                         break;
3172                 }
3173         }
3174
3175         rcu_read_unlock();
3176
3177         return active;
3178 }
3179
3180
3181 static void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, unsigned long exp_time)
3182 {
3183         struct ieee80211_local *local = sdata->local;
3184         struct sta_info *sta, *tmp;
3185         LIST_HEAD(tmp_list);
3186         DECLARE_MAC_BUF(mac);
3187         unsigned long flags;
3188
3189         spin_lock_irqsave(&local->sta_lock, flags);
3190         list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
3191                 if (time_after(jiffies, sta->last_rx + exp_time)) {
3192 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3193                         printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
3194                                sdata->dev->name, print_mac(mac, sta->addr));
3195 #endif
3196                         __sta_info_unlink(&sta);
3197                         if (sta)
3198                                 list_add(&sta->list, &tmp_list);
3199                 }
3200         spin_unlock_irqrestore(&local->sta_lock, flags);
3201
3202         list_for_each_entry_safe(sta, tmp, &tmp_list, list)
3203                 sta_info_destroy(sta);
3204 }
3205
3206
3207 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
3208                                      struct ieee80211_if_sta *ifsta)
3209 {
3210         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
3211
3212         ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT);
3213         if (ieee80211_sta_active_ibss(sdata))
3214                 return;
3215
3216         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
3217                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
3218         ieee80211_sta_req_scan(sdata, ifsta->ssid, ifsta->ssid_len);
3219 }
3220
3221
3222 #ifdef CONFIG_MAC80211_MESH
3223 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
3224                            struct ieee80211_if_sta *ifsta)
3225 {
3226         bool free_plinks;
3227
3228         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
3229         mesh_path_expire(sdata);
3230
3231         free_plinks = mesh_plink_availables(sdata);
3232         if (free_plinks != sdata->u.sta.accepting_plinks)
3233                 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3234
3235         mod_timer(&ifsta->timer, jiffies +
3236                         IEEE80211_MESH_HOUSEKEEPING_INTERVAL);
3237 }
3238
3239
3240 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
3241 {
3242         struct ieee80211_if_sta *ifsta;
3243         ifsta = &sdata->u.sta;
3244         ifsta->state = IEEE80211_STA_MLME_MESH_UP;
3245         ieee80211_sta_timer((unsigned long)sdata);
3246         ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
3247 }
3248 #endif
3249
3250
3251 void ieee80211_sta_timer(unsigned long data)
3252 {
3253         struct ieee80211_sub_if_data *sdata =
3254                 (struct ieee80211_sub_if_data *) data;
3255         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3256         struct ieee80211_local *local = sdata->local;
3257
3258         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3259         queue_work(local->hw.workqueue, &ifsta->work);
3260 }
3261
3262 void ieee80211_sta_work(struct work_struct *work)
3263 {
3264         struct ieee80211_sub_if_data *sdata =
3265                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
3266         struct ieee80211_local *local = sdata->local;
3267         struct ieee80211_if_sta *ifsta;
3268         struct sk_buff *skb;
3269
3270         if (!netif_running(sdata->dev))
3271                 return;
3272
3273         if (local->sta_sw_scanning || local->sta_hw_scanning)
3274                 return;
3275
3276         if (WARN_ON(sdata->vif.type != IEEE80211_IF_TYPE_STA &&
3277                     sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
3278                     sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT))
3279                 return;
3280         ifsta = &sdata->u.sta;
3281
3282         while ((skb = skb_dequeue(&ifsta->skb_queue)))
3283                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
3284
3285 #ifdef CONFIG_MAC80211_MESH
3286         if (ifsta->preq_queue_len &&
3287             time_after(jiffies,
3288                        ifsta->last_preq + msecs_to_jiffies(ifsta->mshcfg.dot11MeshHWMPpreqMinInterval)))
3289                 mesh_path_start_discovery(sdata);
3290 #endif
3291
3292         if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
3293             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
3294             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
3295             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
3296                 if (ifsta->scan_ssid_len)
3297                         ieee80211_sta_start_scan(sdata, ifsta->scan_ssid, ifsta->scan_ssid_len);
3298                 else
3299                         ieee80211_sta_start_scan(sdata, NULL, 0);
3300                 return;
3301         }
3302
3303         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
3304                 if (ieee80211_sta_config_auth(sdata, ifsta))
3305                         return;
3306                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3307         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
3308                 return;
3309
3310         switch (ifsta->state) {
3311         case IEEE80211_STA_MLME_DISABLED:
3312                 break;
3313         case IEEE80211_STA_MLME_DIRECT_PROBE:
3314                 ieee80211_direct_probe(sdata, ifsta);
3315                 break;
3316         case IEEE80211_STA_MLME_AUTHENTICATE:
3317                 ieee80211_authenticate(sdata, ifsta);
3318                 break;
3319         case IEEE80211_STA_MLME_ASSOCIATE:
3320                 ieee80211_associate(sdata, ifsta);
3321                 break;
3322         case IEEE80211_STA_MLME_ASSOCIATED:
3323                 ieee80211_associated(sdata, ifsta);
3324                 break;
3325         case IEEE80211_STA_MLME_IBSS_SEARCH:
3326                 ieee80211_sta_find_ibss(sdata, ifsta);
3327                 break;
3328         case IEEE80211_STA_MLME_IBSS_JOINED:
3329                 ieee80211_sta_merge_ibss(sdata, ifsta);
3330                 break;
3331 #ifdef CONFIG_MAC80211_MESH
3332         case IEEE80211_STA_MLME_MESH_UP:
3333                 ieee80211_mesh_housekeeping(sdata, ifsta);
3334                 break;
3335 #endif
3336         default:
3337                 WARN_ON(1);
3338                 break;
3339         }
3340
3341         if (ieee80211_privacy_mismatch(sdata, ifsta)) {
3342                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
3343                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
3344
3345                 ieee80211_send_disassoc(sdata, ifsta, WLAN_REASON_UNSPECIFIED);
3346                 ieee80211_set_disassoc(sdata, ifsta, 0);
3347         }
3348 }
3349
3350
3351 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
3352                                      struct ieee80211_if_sta *ifsta)
3353 {
3354         struct ieee80211_local *local = sdata->local;
3355
3356         if (local->ops->reset_tsf) {
3357                 /* Reset own TSF to allow time synchronization work. */
3358                 local->ops->reset_tsf(local_to_hw(local));
3359         }
3360
3361         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
3362
3363
3364         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
3365                 ifsta->auth_alg = WLAN_AUTH_OPEN;
3366         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
3367                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
3368         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
3369                 ifsta->auth_alg = WLAN_AUTH_LEAP;
3370         else
3371                 ifsta->auth_alg = WLAN_AUTH_OPEN;
3372         ifsta->auth_transaction = -1;
3373         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
3374         ifsta->assoc_scan_tries = 0;
3375         ifsta->direct_probe_tries = 0;
3376         ifsta->auth_tries = 0;
3377         ifsta->assoc_tries = 0;
3378         netif_carrier_off(sdata->dev);
3379 }
3380
3381
3382 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata,
3383                             struct ieee80211_if_sta *ifsta)
3384 {
3385         struct ieee80211_local *local = sdata->local;
3386
3387         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3388                 return;
3389
3390         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
3391                                 IEEE80211_STA_AUTO_BSSID_SEL)) &&
3392             (ifsta->flags & (IEEE80211_STA_SSID_SET |
3393                                 IEEE80211_STA_AUTO_SSID_SEL))) {
3394                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3395                 queue_work(local->hw.workqueue, &ifsta->work);
3396         }
3397 }
3398
3399 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
3400                                     const char *ssid, int ssid_len)
3401 {
3402         int tmp, hidden_ssid;
3403
3404         if (ssid_len == ifsta->ssid_len &&
3405             !memcmp(ifsta->ssid, ssid, ssid_len))
3406                 return 1;
3407
3408         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
3409                 return 0;
3410
3411         hidden_ssid = 1;
3412         tmp = ssid_len;
3413         while (tmp--) {
3414                 if (ssid[tmp] != '\0') {
3415                         hidden_ssid = 0;
3416                         break;
3417                 }
3418         }
3419
3420         if (hidden_ssid && ifsta->ssid_len == ssid_len)
3421                 return 1;
3422
3423         if (ssid_len == 1 && ssid[0] == ' ')
3424                 return 1;
3425
3426         return 0;
3427 }
3428
3429 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
3430                                      struct ieee80211_if_sta *ifsta)
3431 {
3432         struct ieee80211_local *local = sdata->local;
3433         struct ieee80211_sta_bss *bss, *selected = NULL;
3434         int top_rssi = 0, freq;
3435
3436         spin_lock_bh(&local->sta_bss_lock);
3437         freq = local->oper_channel->center_freq;
3438         list_for_each_entry(bss, &local->sta_bss_list, list) {
3439                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
3440                         continue;
3441
3442                 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
3443                         IEEE80211_STA_AUTO_BSSID_SEL |
3444                         IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
3445                     (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
3446                      !!sdata->default_key))
3447                         continue;
3448
3449                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
3450                     bss->freq != freq)
3451                         continue;
3452
3453                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
3454                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
3455                         continue;
3456
3457                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
3458                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
3459                         continue;
3460
3461                 if (!selected || top_rssi < bss->signal) {
3462                         selected = bss;
3463                         top_rssi = bss->signal;
3464                 }
3465         }
3466         if (selected)
3467                 atomic_inc(&selected->users);
3468         spin_unlock_bh(&local->sta_bss_lock);
3469
3470         if (selected) {
3471                 ieee80211_set_freq(sdata, selected->freq);
3472                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
3473                         ieee80211_sta_set_ssid(sdata, selected->ssid,
3474                                                selected->ssid_len);
3475                 ieee80211_sta_set_bssid(sdata, selected->bssid);
3476                 ieee80211_sta_def_wmm_params(sdata, selected, 0);
3477
3478                 /* Send out direct probe if no probe resp was received or
3479                  * the one we have is outdated
3480                  */
3481                 if (!selected->last_probe_resp ||
3482                     time_after(jiffies, selected->last_probe_resp
3483                                         + IEEE80211_SCAN_RESULT_EXPIRE))
3484                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
3485                 else
3486                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
3487
3488                 ieee80211_rx_bss_put(local, selected);
3489                 ieee80211_sta_reset_auth(sdata, ifsta);
3490                 return 0;
3491         } else {
3492                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
3493                         ifsta->assoc_scan_tries++;
3494                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
3495                                 ieee80211_sta_start_scan(sdata, NULL, 0);
3496                         else
3497                                 ieee80211_sta_start_scan(sdata, ifsta->ssid,
3498                                                          ifsta->ssid_len);
3499                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
3500                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3501                 } else
3502                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
3503         }
3504         return -1;
3505 }
3506
3507
3508 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
3509                                      struct ieee80211_if_sta *ifsta)
3510 {
3511         struct ieee80211_local *local = sdata->local;
3512         struct ieee80211_sta_bss *bss;
3513         struct ieee80211_supported_band *sband;
3514         u8 bssid[ETH_ALEN], *pos;
3515         int i;
3516         int ret;
3517         DECLARE_MAC_BUF(mac);
3518
3519 #if 0
3520         /* Easier testing, use fixed BSSID. */
3521         memset(bssid, 0xfe, ETH_ALEN);
3522 #else
3523         /* Generate random, not broadcast, locally administered BSSID. Mix in
3524          * own MAC address to make sure that devices that do not have proper
3525          * random number generator get different BSSID. */
3526         get_random_bytes(bssid, ETH_ALEN);
3527         for (i = 0; i < ETH_ALEN; i++)
3528                 bssid[i] ^= sdata->dev->dev_addr[i];
3529         bssid[0] &= ~0x01;
3530         bssid[0] |= 0x02;
3531 #endif
3532
3533         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
3534                sdata->dev->name, print_mac(mac, bssid));
3535
3536         bss = ieee80211_rx_bss_add(sdata, bssid,
3537                                    local->hw.conf.channel->center_freq,
3538                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
3539         if (!bss)
3540                 return -ENOMEM;
3541
3542         bss->band = local->hw.conf.channel->band;
3543         sband = local->hw.wiphy->bands[bss->band];
3544
3545         if (local->hw.conf.beacon_int == 0)
3546                 local->hw.conf.beacon_int = 100;
3547         bss->beacon_int = local->hw.conf.beacon_int;
3548         bss->last_update = jiffies;
3549         bss->capability = WLAN_CAPABILITY_IBSS;
3550
3551         if (sdata->default_key)
3552                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
3553         else
3554                 sdata->drop_unencrypted = 0;
3555
3556         bss->supp_rates_len = sband->n_bitrates;
3557         pos = bss->supp_rates;
3558         for (i = 0; i < sband->n_bitrates; i++) {
3559                 int rate = sband->bitrates[i].bitrate;
3560                 *pos++ = (u8) (rate / 5);
3561         }
3562
3563         ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3564         ieee80211_rx_bss_put(local, bss);
3565         return ret;
3566 }
3567
3568
3569 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
3570                                    struct ieee80211_if_sta *ifsta)
3571 {
3572         struct ieee80211_local *local = sdata->local;
3573         struct ieee80211_sta_bss *bss;
3574         int found = 0;
3575         u8 bssid[ETH_ALEN];
3576         int active_ibss;
3577         DECLARE_MAC_BUF(mac);
3578         DECLARE_MAC_BUF(mac2);
3579
3580         if (ifsta->ssid_len == 0)
3581                 return -EINVAL;
3582
3583         active_ibss = ieee80211_sta_active_ibss(sdata);
3584 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3585         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
3586                sdata->dev->name, active_ibss);
3587 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3588         spin_lock_bh(&local->sta_bss_lock);
3589         list_for_each_entry(bss, &local->sta_bss_list, list) {
3590                 if (ifsta->ssid_len != bss->ssid_len ||
3591                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
3592                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
3593                         continue;
3594 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3595                 printk(KERN_DEBUG "   bssid=%s found\n",
3596                        print_mac(mac, bss->bssid));
3597 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3598                 memcpy(bssid, bss->bssid, ETH_ALEN);
3599                 found = 1;
3600                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
3601                         break;
3602         }
3603         spin_unlock_bh(&local->sta_bss_lock);
3604
3605 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3606         if (found)
3607                 printk(KERN_DEBUG "   sta_find_ibss: selected %s current "
3608                        "%s\n", print_mac(mac, bssid),
3609                        print_mac(mac2, ifsta->bssid));
3610 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3611
3612         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3613                 int ret;
3614                 int search_freq;
3615
3616                 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
3617                         search_freq = bss->freq;
3618                 else
3619                         search_freq = local->hw.conf.channel->center_freq;
3620
3621                 bss = ieee80211_rx_bss_get(local, bssid, search_freq,
3622                                            ifsta->ssid, ifsta->ssid_len);
3623                 if (!bss)
3624                         goto dont_join;
3625
3626                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
3627                        " based on configured SSID\n",
3628                        sdata->dev->name, print_mac(mac, bssid));
3629                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
3630                 ieee80211_rx_bss_put(local, bss);
3631                 return ret;
3632         }
3633
3634 dont_join:
3635 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3636         printk(KERN_DEBUG "   did not try to join ibss\n");
3637 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3638
3639         /* Selected IBSS not found in current scan results - try to scan */
3640         if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED &&
3641             !ieee80211_sta_active_ibss(sdata)) {
3642                 mod_timer(&ifsta->timer, jiffies +
3643                                       IEEE80211_IBSS_MERGE_INTERVAL);
3644         } else if (time_after(jiffies, local->last_scan_completed +
3645                               IEEE80211_SCAN_INTERVAL)) {
3646                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
3647                        "join\n", sdata->dev->name);
3648                 return ieee80211_sta_req_scan(sdata, ifsta->ssid,
3649                                               ifsta->ssid_len);
3650         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
3651                 int interval = IEEE80211_SCAN_INTERVAL;
3652
3653                 if (time_after(jiffies, ifsta->ibss_join_req +
3654                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
3655                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
3656                             (!(local->oper_channel->flags &
3657                                         IEEE80211_CHAN_NO_IBSS)))
3658                                 return ieee80211_sta_create_ibss(sdata, ifsta);
3659                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
3660                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
3661                                        " %d MHz\n", sdata->dev->name,
3662                                        local->hw.conf.channel->center_freq);
3663                         }
3664
3665                         /* No IBSS found - decrease scan interval and continue
3666                          * scanning. */
3667                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
3668                 }
3669
3670                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
3671                 mod_timer(&ifsta->timer, jiffies + interval);
3672                 return 0;
3673         }
3674
3675         return 0;
3676 }
3677
3678
3679 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
3680 {
3681         struct ieee80211_if_sta *ifsta;
3682         int res;
3683
3684         if (len > IEEE80211_MAX_SSID_LEN)
3685                 return -EINVAL;
3686
3687         ifsta = &sdata->u.sta;
3688
3689         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) {
3690                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
3691                 memcpy(ifsta->ssid, ssid, len);
3692                 ifsta->ssid_len = len;
3693                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3694
3695                 res = 0;
3696                 /*
3697                  * Hack! MLME code needs to be cleaned up to have different
3698                  * entry points for configuration and internal selection change
3699                  */
3700                 if (netif_running(sdata->dev))
3701                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID);
3702                 if (res) {
3703                         printk(KERN_DEBUG "%s: Failed to config new SSID to "
3704                                "the low-level driver\n", sdata->dev->name);
3705                         return res;
3706                 }
3707         }
3708
3709         if (len)
3710                 ifsta->flags |= IEEE80211_STA_SSID_SET;
3711         else
3712                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3713
3714         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3715             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
3716                 ifsta->ibss_join_req = jiffies;
3717                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
3718                 return ieee80211_sta_find_ibss(sdata, ifsta);
3719         }
3720
3721         return 0;
3722 }
3723
3724
3725 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
3726 {
3727         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3728         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3729         *len = ifsta->ssid_len;
3730         return 0;
3731 }
3732
3733
3734 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
3735 {
3736         struct ieee80211_if_sta *ifsta;
3737         int res;
3738
3739         ifsta = &sdata->u.sta;
3740
3741         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3742                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3743                 res = 0;
3744                 /*
3745                  * Hack! See also ieee80211_sta_set_ssid.
3746                  */
3747                 if (netif_running(sdata->dev))
3748                         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
3749                 if (res) {
3750                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3751                                "the low-level driver\n", sdata->dev->name);
3752                         return res;
3753                 }
3754         }
3755
3756         if (is_valid_ether_addr(bssid))
3757                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3758         else
3759                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3760
3761         return 0;
3762 }
3763
3764
3765 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3766                                     struct ieee80211_sub_if_data *sdata,
3767                                     int powersave)
3768 {
3769         struct sk_buff *skb;
3770         struct ieee80211_hdr *nullfunc;
3771         __le16 fc;
3772
3773         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3774         if (!skb) {
3775                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3776                        "frame\n", sdata->dev->name);
3777                 return;
3778         }
3779         skb_reserve(skb, local->hw.extra_tx_headroom);
3780
3781         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3782         memset(nullfunc, 0, 24);
3783         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3784                          IEEE80211_FCTL_TODS);
3785         if (powersave)
3786                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
3787         nullfunc->frame_control = fc;
3788         memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3789         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3790         memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3791
3792         ieee80211_sta_tx(sdata, skb, 0);
3793 }
3794
3795
3796 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3797 {
3798         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
3799             ieee80211_vif_is_mesh(&sdata->vif))
3800                 ieee80211_sta_timer((unsigned long)sdata);
3801 }
3802
3803 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3804 {
3805         struct ieee80211_local *local = hw_to_local(hw);
3806         struct net_device *dev = local->scan_dev;
3807         struct ieee80211_sub_if_data *sdata;
3808         union iwreq_data wrqu;
3809
3810         local->last_scan_completed = jiffies;
3811         memset(&wrqu, 0, sizeof(wrqu));
3812         wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3813
3814         if (local->sta_hw_scanning) {
3815                 local->sta_hw_scanning = 0;
3816                 if (ieee80211_hw_config(local))
3817                         printk(KERN_DEBUG "%s: failed to restore operational "
3818                                "channel after scan\n", dev->name);
3819                 /* Restart STA timer for HW scan case */
3820                 rcu_read_lock();
3821                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3822                         ieee80211_restart_sta_timer(sdata);
3823                 rcu_read_unlock();
3824
3825                 goto done;
3826         }
3827
3828         local->sta_sw_scanning = 0;
3829         if (ieee80211_hw_config(local))
3830                 printk(KERN_DEBUG "%s: failed to restore operational "
3831                        "channel after scan\n", dev->name);
3832
3833
3834         netif_tx_lock_bh(local->mdev);
3835         netif_addr_lock(local->mdev);
3836         local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3837         local->ops->configure_filter(local_to_hw(local),
3838                                      FIF_BCN_PRBRESP_PROMISC,
3839                                      &local->filter_flags,
3840                                      local->mdev->mc_count,
3841                                      local->mdev->mc_list);
3842
3843         netif_addr_unlock(local->mdev);
3844         netif_tx_unlock_bh(local->mdev);
3845
3846         rcu_read_lock();
3847         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3848                 /* Tell AP we're back */
3849                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3850                     sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
3851                         ieee80211_send_nullfunc(local, sdata, 0);
3852
3853                 ieee80211_restart_sta_timer(sdata);
3854
3855                 netif_wake_queue(sdata->dev);
3856         }
3857         rcu_read_unlock();
3858
3859 done:
3860         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3861         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3862                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3863                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3864                     (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
3865                     !ieee80211_sta_active_ibss(sdata)))
3866                         ieee80211_sta_find_ibss(sdata, ifsta);
3867         }
3868 }
3869 EXPORT_SYMBOL(ieee80211_scan_completed);
3870
3871 void ieee80211_sta_scan_work(struct work_struct *work)
3872 {
3873         struct ieee80211_local *local =
3874                 container_of(work, struct ieee80211_local, scan_work.work);
3875         struct net_device *dev = local->scan_dev;
3876         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3877         struct ieee80211_supported_band *sband;
3878         struct ieee80211_channel *chan;
3879         int skip;
3880         unsigned long next_delay = 0;
3881
3882         if (!local->sta_sw_scanning)
3883                 return;
3884
3885         switch (local->scan_state) {
3886         case SCAN_SET_CHANNEL:
3887                 /*
3888                  * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
3889                  * after we successfully scanned the last channel of the last
3890                  * band (and the last band is supported by the hw)
3891                  */
3892                 if (local->scan_band < IEEE80211_NUM_BANDS)
3893                         sband = local->hw.wiphy->bands[local->scan_band];
3894                 else
3895                         sband = NULL;
3896
3897                 /*
3898                  * If we are at an unsupported band and have more bands
3899                  * left to scan, advance to the next supported one.
3900                  */
3901                 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
3902                         local->scan_band++;
3903                         sband = local->hw.wiphy->bands[local->scan_band];
3904                         local->scan_channel_idx = 0;
3905                 }
3906
3907                 /* if no more bands/channels left, complete scan */
3908                 if (!sband || local->scan_channel_idx >= sband->n_channels) {
3909                         ieee80211_scan_completed(local_to_hw(local));
3910                         return;
3911                 }
3912                 skip = 0;
3913                 chan = &sband->channels[local->scan_channel_idx];
3914
3915                 if (chan->flags & IEEE80211_CHAN_DISABLED ||
3916                     (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3917                      chan->flags & IEEE80211_CHAN_NO_IBSS))
3918                         skip = 1;
3919
3920                 if (!skip) {
3921                         local->scan_channel = chan;
3922                         if (ieee80211_hw_config(local)) {
3923                                 printk(KERN_DEBUG "%s: failed to set freq to "
3924                                        "%d MHz for scan\n", dev->name,
3925                                        chan->center_freq);
3926                                 skip = 1;
3927                         }
3928                 }
3929
3930                 /* advance state machine to next channel/band */
3931                 local->scan_channel_idx++;
3932                 if (local->scan_channel_idx >= sband->n_channels) {
3933                         /*
3934                          * scan_band may end up == IEEE80211_NUM_BANDS, but
3935                          * we'll catch that case above and complete the scan
3936                          * if that is the case.
3937                          */
3938                         local->scan_band++;
3939                         local->scan_channel_idx = 0;
3940                 }
3941
3942                 if (skip)
3943                         break;
3944
3945                 next_delay = IEEE80211_PROBE_DELAY +
3946                              usecs_to_jiffies(local->hw.channel_change_time);
3947                 local->scan_state = SCAN_SEND_PROBE;
3948                 break;
3949         case SCAN_SEND_PROBE:
3950                 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3951                 local->scan_state = SCAN_SET_CHANNEL;
3952
3953                 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
3954                         break;
3955                 ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
3956                                          local->scan_ssid_len);
3957                 next_delay = IEEE80211_CHANNEL_TIME;
3958                 break;
3959         }
3960
3961         if (local->sta_sw_scanning)
3962                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3963                                    next_delay);
3964 }
3965
3966
3967 static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
3968                                     u8 *ssid, size_t ssid_len)
3969 {
3970         struct ieee80211_local *local = scan_sdata->local;
3971         struct ieee80211_sub_if_data *sdata;
3972
3973         if (ssid_len > IEEE80211_MAX_SSID_LEN)
3974                 return -EINVAL;
3975
3976         /* MLME-SCAN.request (page 118)  page 144 (11.1.3.1)
3977          * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
3978          * BSSID: MACAddress
3979          * SSID
3980          * ScanType: ACTIVE, PASSIVE
3981          * ProbeDelay: delay (in microseconds) to be used prior to transmitting
3982          *    a Probe frame during active scanning
3983          * ChannelList
3984          * MinChannelTime (>= ProbeDelay), in TU
3985          * MaxChannelTime: (>= MinChannelTime), in TU
3986          */
3987
3988          /* MLME-SCAN.confirm
3989           * BSSDescriptionSet
3990           * ResultCode: SUCCESS, INVALID_PARAMETERS
3991          */
3992
3993         if (local->sta_sw_scanning || local->sta_hw_scanning) {
3994                 if (local->scan_dev == scan_sdata->dev)
3995                         return 0;
3996                 return -EBUSY;
3997         }
3998
3999         if (local->ops->hw_scan) {
4000                 int rc = local->ops->hw_scan(local_to_hw(local),
4001                                              ssid, ssid_len);
4002                 if (!rc) {
4003                         local->sta_hw_scanning = 1;
4004                         local->scan_dev = scan_sdata->dev;
4005                 }
4006                 return rc;
4007         }
4008
4009         local->sta_sw_scanning = 1;
4010
4011         rcu_read_lock();
4012         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4013                 netif_stop_queue(sdata->dev);
4014                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
4015                     (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
4016                         ieee80211_send_nullfunc(local, sdata, 1);
4017         }
4018         rcu_read_unlock();
4019
4020         if (ssid) {
4021                 local->scan_ssid_len = ssid_len;
4022                 memcpy(local->scan_ssid, ssid, ssid_len);
4023         } else
4024                 local->scan_ssid_len = 0;
4025         local->scan_state = SCAN_SET_CHANNEL;
4026         local->scan_channel_idx = 0;
4027         local->scan_band = IEEE80211_BAND_2GHZ;
4028         local->scan_dev = scan_sdata->dev;
4029
4030         netif_addr_lock_bh(local->mdev);
4031         local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
4032         local->ops->configure_filter(local_to_hw(local),
4033                                      FIF_BCN_PRBRESP_PROMISC,
4034                                      &local->filter_flags,
4035                                      local->mdev->mc_count,
4036                                      local->mdev->mc_list);
4037         netif_addr_unlock_bh(local->mdev);
4038
4039         /* TODO: start scan as soon as all nullfunc frames are ACKed */
4040         queue_delayed_work(local->hw.workqueue, &local->scan_work,
4041                            IEEE80211_CHANNEL_TIME);
4042
4043         return 0;
4044 }
4045
4046
4047 int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len)
4048 {
4049         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4050         struct ieee80211_local *local = sdata->local;
4051
4052         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4053                 return ieee80211_sta_start_scan(sdata, ssid, ssid_len);
4054
4055         if (local->sta_sw_scanning || local->sta_hw_scanning) {
4056                 if (local->scan_dev == sdata->dev)
4057                         return 0;
4058                 return -EBUSY;
4059         }
4060
4061         ifsta->scan_ssid_len = ssid_len;
4062         if (ssid_len)
4063                 memcpy(ifsta->scan_ssid, ssid, ssid_len);
4064         set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
4065         queue_work(local->hw.workqueue, &ifsta->work);
4066         return 0;
4067 }
4068
4069
4070 static void ieee80211_sta_add_scan_ies(struct iw_request_info *info,
4071                                        struct ieee80211_sta_bss *bss,
4072                                        char **current_ev, char *end_buf)
4073 {
4074         u8 *pos, *end, *next;
4075         struct iw_event iwe;
4076
4077         if (bss == NULL || bss->ies == NULL)
4078                 return;
4079
4080         /*
4081          * If needed, fragment the IEs buffer (at IE boundaries) into short
4082          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
4083          */
4084         pos = bss->ies;
4085         end = pos + bss->ies_len;
4086
4087         while (end - pos > IW_GENERIC_IE_MAX) {
4088                 next = pos + 2 + pos[1];
4089                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
4090                         next = next + 2 + next[1];
4091
4092                 memset(&iwe, 0, sizeof(iwe));
4093                 iwe.cmd = IWEVGENIE;
4094                 iwe.u.data.length = next - pos;
4095                 *current_ev = iwe_stream_add_point(info, *current_ev,
4096                                                    end_buf, &iwe, pos);
4097
4098                 pos = next;
4099         }
4100
4101         if (end > pos) {
4102                 memset(&iwe, 0, sizeof(iwe));
4103                 iwe.cmd = IWEVGENIE;
4104                 iwe.u.data.length = end - pos;
4105                 *current_ev = iwe_stream_add_point(info, *current_ev,
4106                                                    end_buf, &iwe, pos);
4107         }
4108 }
4109
4110
4111 static char *
4112 ieee80211_sta_scan_result(struct ieee80211_local *local,
4113                           struct iw_request_info *info,
4114                           struct ieee80211_sta_bss *bss,
4115                           char *current_ev, char *end_buf)
4116 {
4117         struct iw_event iwe;
4118
4119         if (time_after(jiffies,
4120                        bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
4121                 return current_ev;
4122
4123         memset(&iwe, 0, sizeof(iwe));
4124         iwe.cmd = SIOCGIWAP;
4125         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
4126         memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
4127         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4128                                           IW_EV_ADDR_LEN);
4129
4130         memset(&iwe, 0, sizeof(iwe));
4131         iwe.cmd = SIOCGIWESSID;
4132         if (bss_mesh_cfg(bss)) {
4133                 iwe.u.data.length = bss_mesh_id_len(bss);
4134                 iwe.u.data.flags = 1;
4135                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4136                                                   &iwe, bss_mesh_id(bss));
4137         } else {
4138                 iwe.u.data.length = bss->ssid_len;
4139                 iwe.u.data.flags = 1;
4140                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4141                                                   &iwe, bss->ssid);
4142         }
4143
4144         if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
4145             || bss_mesh_cfg(bss)) {
4146                 memset(&iwe, 0, sizeof(iwe));
4147                 iwe.cmd = SIOCGIWMODE;
4148                 if (bss_mesh_cfg(bss))
4149                         iwe.u.mode = IW_MODE_MESH;
4150                 else if (bss->capability & WLAN_CAPABILITY_ESS)
4151                         iwe.u.mode = IW_MODE_MASTER;
4152                 else
4153                         iwe.u.mode = IW_MODE_ADHOC;
4154                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
4155                                                   &iwe, IW_EV_UINT_LEN);
4156         }
4157
4158         memset(&iwe, 0, sizeof(iwe));
4159         iwe.cmd = SIOCGIWFREQ;
4160         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
4161         iwe.u.freq.e = 0;
4162         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4163                                           IW_EV_FREQ_LEN);
4164
4165         memset(&iwe, 0, sizeof(iwe));
4166         iwe.cmd = SIOCGIWFREQ;
4167         iwe.u.freq.m = bss->freq;
4168         iwe.u.freq.e = 6;
4169         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4170                                           IW_EV_FREQ_LEN);
4171         memset(&iwe, 0, sizeof(iwe));
4172         iwe.cmd = IWEVQUAL;
4173         iwe.u.qual.qual = bss->qual;
4174         iwe.u.qual.level = bss->signal;
4175         iwe.u.qual.noise = bss->noise;
4176         iwe.u.qual.updated = local->wstats_flags;
4177         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
4178                                           IW_EV_QUAL_LEN);
4179
4180         memset(&iwe, 0, sizeof(iwe));
4181         iwe.cmd = SIOCGIWENCODE;
4182         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
4183                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
4184         else
4185                 iwe.u.data.flags = IW_ENCODE_DISABLED;
4186         iwe.u.data.length = 0;
4187         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
4188                                           &iwe, "");
4189
4190         ieee80211_sta_add_scan_ies(info, bss, &current_ev, end_buf);
4191
4192         if (bss && bss->supp_rates_len > 0) {
4193                 /* display all supported rates in readable format */
4194                 char *p = current_ev + iwe_stream_lcp_len(info);
4195                 int i;
4196
4197                 memset(&iwe, 0, sizeof(iwe));
4198                 iwe.cmd = SIOCGIWRATE;
4199                 /* Those two flags are ignored... */
4200                 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
4201
4202                 for (i = 0; i < bss->supp_rates_len; i++) {
4203                         iwe.u.bitrate.value = ((bss->supp_rates[i] &
4204                                                         0x7f) * 500000);
4205                         p = iwe_stream_add_value(info, current_ev, p,
4206                                         end_buf, &iwe, IW_EV_PARAM_LEN);
4207                 }
4208                 current_ev = p;
4209         }
4210
4211         if (bss) {
4212                 char *buf;
4213                 buf = kmalloc(30, GFP_ATOMIC);
4214                 if (buf) {
4215                         memset(&iwe, 0, sizeof(iwe));
4216                         iwe.cmd = IWEVCUSTOM;
4217                         sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
4218                         iwe.u.data.length = strlen(buf);
4219                         current_ev = iwe_stream_add_point(info, current_ev,
4220                                                           end_buf,
4221                                                           &iwe, buf);
4222                         memset(&iwe, 0, sizeof(iwe));
4223                         iwe.cmd = IWEVCUSTOM;
4224                         sprintf(buf, " Last beacon: %dms ago",
4225                                 jiffies_to_msecs(jiffies - bss->last_update));
4226                         iwe.u.data.length = strlen(buf);
4227                         current_ev = iwe_stream_add_point(info, current_ev,
4228                                                           end_buf, &iwe, buf);
4229                         kfree(buf);
4230                 }
4231         }
4232
4233         if (bss_mesh_cfg(bss)) {
4234                 char *buf;
4235                 u8 *cfg = bss_mesh_cfg(bss);
4236                 buf = kmalloc(50, GFP_ATOMIC);
4237                 if (buf) {
4238                         memset(&iwe, 0, sizeof(iwe));
4239                         iwe.cmd = IWEVCUSTOM;
4240                         sprintf(buf, "Mesh network (version %d)", cfg[0]);
4241                         iwe.u.data.length = strlen(buf);
4242                         current_ev = iwe_stream_add_point(info, current_ev,
4243                                                           end_buf,
4244                                                           &iwe, buf);
4245                         sprintf(buf, "Path Selection Protocol ID: "
4246                                 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
4247                                                         cfg[4]);
4248                         iwe.u.data.length = strlen(buf);
4249                         current_ev = iwe_stream_add_point(info, current_ev,
4250                                                           end_buf,
4251                                                           &iwe, buf);
4252                         sprintf(buf, "Path Selection Metric ID: "
4253                                 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
4254                                                         cfg[8]);
4255                         iwe.u.data.length = strlen(buf);
4256                         current_ev = iwe_stream_add_point(info, current_ev,
4257                                                           end_buf,
4258                                                           &iwe, buf);
4259                         sprintf(buf, "Congestion Control Mode ID: "
4260                                 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
4261                                                         cfg[11], cfg[12]);
4262                         iwe.u.data.length = strlen(buf);
4263                         current_ev = iwe_stream_add_point(info, current_ev,
4264                                                           end_buf,
4265                                                           &iwe, buf);
4266                         sprintf(buf, "Channel Precedence: "
4267                                 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
4268                                                         cfg[15], cfg[16]);
4269                         iwe.u.data.length = strlen(buf);
4270                         current_ev = iwe_stream_add_point(info, current_ev,
4271                                                           end_buf,
4272                                                           &iwe, buf);
4273                         kfree(buf);
4274                 }
4275         }
4276
4277         return current_ev;
4278 }
4279
4280
4281 int ieee80211_sta_scan_results(struct ieee80211_local *local,
4282                                struct iw_request_info *info,
4283                                char *buf, size_t len)
4284 {
4285         char *current_ev = buf;
4286         char *end_buf = buf + len;
4287         struct ieee80211_sta_bss *bss;
4288
4289         spin_lock_bh(&local->sta_bss_lock);
4290         list_for_each_entry(bss, &local->sta_bss_list, list) {
4291                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
4292                         spin_unlock_bh(&local->sta_bss_lock);
4293                         return -E2BIG;
4294                 }
4295                 current_ev = ieee80211_sta_scan_result(local, info, bss,
4296                                                        current_ev, end_buf);
4297         }
4298         spin_unlock_bh(&local->sta_bss_lock);
4299         return current_ev - buf;
4300 }
4301
4302
4303 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
4304 {
4305         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4306
4307         kfree(ifsta->extra_ie);
4308         if (len == 0) {
4309                 ifsta->extra_ie = NULL;
4310                 ifsta->extra_ie_len = 0;
4311                 return 0;
4312         }
4313         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
4314         if (!ifsta->extra_ie) {
4315                 ifsta->extra_ie_len = 0;
4316                 return -ENOMEM;
4317         }
4318         memcpy(ifsta->extra_ie, ie, len);
4319         ifsta->extra_ie_len = len;
4320         return 0;
4321 }
4322
4323
4324 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
4325                                         struct sk_buff *skb, u8 *bssid,
4326                                         u8 *addr, u64 supp_rates)
4327 {
4328         struct ieee80211_local *local = sdata->local;
4329         struct sta_info *sta;
4330         DECLARE_MAC_BUF(mac);
4331         int band = local->hw.conf.channel->band;
4332
4333         /* TODO: Could consider removing the least recently used entry and
4334          * allow new one to be added. */
4335         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
4336                 if (net_ratelimit()) {
4337                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
4338                                "entry %s\n", sdata->dev->name, print_mac(mac, addr));
4339                 }
4340                 return NULL;
4341         }
4342
4343         if (compare_ether_addr(bssid, sdata->u.sta.bssid))
4344                 return NULL;
4345
4346 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
4347         printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
4348                wiphy_name(local->hw.wiphy), print_mac(mac, addr), sdata->dev->name);
4349 #endif
4350
4351         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
4352         if (!sta)
4353                 return NULL;
4354
4355         set_sta_flags(sta, WLAN_STA_AUTHORIZED);
4356
4357         /* make sure mandatory rates are always added */
4358         sta->supp_rates[band] = supp_rates |
4359                         ieee80211_sta_get_mandatory_rates(local, band);
4360
4361         rate_control_rate_init(sta, local);
4362
4363         if (sta_info_insert(sta))
4364                 return NULL;
4365
4366         return sta;
4367 }
4368
4369
4370 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
4371 {
4372         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4373
4374         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
4375                sdata->dev->name, reason);
4376
4377         if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4378             sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
4379                 return -EINVAL;
4380
4381         ieee80211_send_deauth(sdata, ifsta, reason);
4382         ieee80211_set_disassoc(sdata, ifsta, 1);
4383         return 0;
4384 }
4385
4386
4387 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
4388 {
4389         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4390
4391         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
4392                sdata->dev->name, reason);
4393
4394         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4395                 return -EINVAL;
4396
4397         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
4398                 return -1;
4399
4400         ieee80211_send_disassoc(sdata, ifsta, reason);
4401         ieee80211_set_disassoc(sdata, ifsta, 0);
4402         return 0;
4403 }
4404
4405 void ieee80211_notify_mac(struct ieee80211_hw *hw,
4406                           enum ieee80211_notification_types  notif_type)
4407 {
4408         struct ieee80211_local *local = hw_to_local(hw);
4409         struct ieee80211_sub_if_data *sdata;
4410
4411         switch (notif_type) {
4412         case IEEE80211_NOTIFY_RE_ASSOC:
4413                 rcu_read_lock();
4414                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4415                         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4416                                 continue;
4417
4418                         ieee80211_sta_req_auth(sdata, &sdata->u.sta);
4419                 }
4420                 rcu_read_unlock();
4421                 break;
4422         }
4423 }
4424 EXPORT_SYMBOL(ieee80211_notify_mac);