err.no Git - linux-2.6/blob - net/mac80211/ieee80211_sta.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 "ieee80211_rate.h"
  34 #include "ieee80211_led.h"
  35 #include "mesh.h"
  36
  37 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  38 #define IEEE80211_AUTH_MAX_TRIES 3
  39 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  40 #define IEEE80211_ASSOC_MAX_TRIES 3
  41 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  42 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
  43 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  44 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  45 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  46 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  47 #define IEEE80211_IBSS_JOIN_TIMEOUT (20 * HZ)
  48
  49 #define IEEE80211_PROBE_DELAY (HZ / 33)
  50 #define IEEE80211_CHANNEL_TIME (HZ / 33)
  51 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
  52 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
  53 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  54 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  55 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
  56
  57 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  58
  59
  60 #define IEEE80211_FC(type, stype) cpu_to_le16(type | stype)
  61
  62 #define ERP_INFO_USE_PROTECTION BIT(1)
  63
  64 /* mgmt header + 1 byte action code */
  65 #define IEEE80211_MIN_ACTION_SIZE (24 + 1)
  66
  67 #define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
  68 #define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
  69 #define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0
  70 #define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
  71 #define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
  72
  73 /* next values represent the buffer size for A-MPDU frame.
  74  * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */
  75 #define IEEE80211_MIN_AMPDU_BUF 0x8
  76 #define IEEE80211_MAX_AMPDU_BUF 0x40
  77
  78 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
  79                                      u8 *ssid, size_t ssid_len);
  80 static struct ieee80211_sta_bss *
  81 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int freq,
  82                      u8 *ssid, u8 ssid_len);
  83 static void ieee80211_rx_bss_put(struct net_device *dev,
  84                                  struct ieee80211_sta_bss *bss);
  85 static int ieee80211_sta_find_ibss(struct net_device *dev,
  86                                    struct ieee80211_if_sta *ifsta);
  87 static int ieee80211_sta_wep_configured(struct net_device *dev);
  88 static int ieee80211_sta_start_scan(struct net_device *dev,
  89                                     u8 *ssid, size_t ssid_len);
  90 static int ieee80211_sta_config_auth(struct net_device *dev,
  91                                      struct ieee80211_if_sta *ifsta);
  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
 102         while (left >= 2) {
 103                 u8 id, elen;
 104
 105                 id = *pos++;
 106                 elen = *pos++;
 107                 left -= 2;
 108
 109                 if (elen > left)
 110                         return;
 111
 112                 switch (id) {
 113                 case WLAN_EID_SSID:
 114                         elems->ssid = pos;
 115                         elems->ssid_len = elen;
 116                         break;
 117                 case WLAN_EID_SUPP_RATES:
 118                         elems->supp_rates = pos;
 119                         elems->supp_rates_len = elen;
 120                         break;
 121                 case WLAN_EID_FH_PARAMS:
 122                         elems->fh_params = pos;
 123                         elems->fh_params_len = elen;
 124                         break;
 125                 case WLAN_EID_DS_PARAMS:
 126                         elems->ds_params = pos;
 127                         elems->ds_params_len = elen;
 128                         break;
 129                 case WLAN_EID_CF_PARAMS:
 130                         elems->cf_params = pos;
 131                         elems->cf_params_len = elen;
 132                         break;
 133                 case WLAN_EID_TIM:
 134                         elems->tim = pos;
 135                         elems->tim_len = elen;
 136                         break;
 137                 case WLAN_EID_IBSS_PARAMS:
 138                         elems->ibss_params = pos;
 139                         elems->ibss_params_len = elen;
 140                         break;
 141                 case WLAN_EID_CHALLENGE:
 142                         elems->challenge = pos;
 143                         elems->challenge_len = elen;
 144                         break;
 145                 case WLAN_EID_WPA:
 146                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 147                             pos[2] == 0xf2) {
 148                                 /* Microsoft OUI (00:50:F2) */
 149                                 if (pos[3] == 1) {
 150                                         /* OUI Type 1 - WPA IE */
 151                                         elems->wpa = pos;
 152                                         elems->wpa_len = elen;
 153                                 } else if (elen >= 5 && pos[3] == 2) {
 154                                         if (pos[4] == 0) {
 155                                                 elems->wmm_info = pos;
 156                                                 elems->wmm_info_len = elen;
 157                                         } else if (pos[4] == 1) {
 158                                                 elems->wmm_param = pos;
 159                                                 elems->wmm_param_len = elen;
 160                                         }
 161                                 }
 162                         }
 163                         break;
 164                 case WLAN_EID_RSN:
 165                         elems->rsn = pos;
 166                         elems->rsn_len = elen;
 167                         break;
 168                 case WLAN_EID_ERP_INFO:
 169                         elems->erp_info = pos;
 170                         elems->erp_info_len = elen;
 171                         break;
 172                 case WLAN_EID_EXT_SUPP_RATES:
 173                         elems->ext_supp_rates = pos;
 174                         elems->ext_supp_rates_len = elen;
 175                         break;
 176                 case WLAN_EID_HT_CAPABILITY:
 177                         elems->ht_cap_elem = pos;
 178                         elems->ht_cap_elem_len = elen;
 179                         break;
 180                 case WLAN_EID_HT_EXTRA_INFO:
 181                         elems->ht_info_elem = pos;
 182                         elems->ht_info_elem_len = elen;
 183                         break;
 184                 case WLAN_EID_MESH_ID:
 185                         elems->mesh_id = pos;
 186                         elems->mesh_id_len = elen;
 187                         break;
 188                 case WLAN_EID_MESH_CONFIG:
 189                         elems->mesh_config = pos;
 190                         elems->mesh_config_len = elen;
 191                         break;
 192                 case WLAN_EID_PEER_LINK:
 193                         elems->peer_link = pos;
 194                         elems->peer_link_len = elen;
 195                         break;
 196                 case WLAN_EID_PREQ:
 197                         elems->preq = pos;
 198                         elems->preq_len = elen;
 199                         break;
 200                 case WLAN_EID_PREP:
 201                         elems->prep = pos;
 202                         elems->prep_len = elen;
 203                         break;
 204                 case WLAN_EID_PERR:
 205                         elems->perr = pos;
 206                         elems->perr_len = elen;
 207                         break;
 208                 default:
 209                         break;
 210                 }
 211
 212                 left -= elen;
 213                 pos += elen;
 214         }
 215 }
 216
 217
 218 static int ecw2cw(int ecw)
 219 {
 220         return (1 << ecw) - 1;
 221 }
 222
 223
 224 static void ieee80211_sta_def_wmm_params(struct net_device *dev,
 225                                          struct ieee80211_sta_bss *bss,
 226                                          int ibss)
 227 {
 228         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 229         struct ieee80211_local *local = sdata->local;
 230         int i, have_higher_than_11mbit = 0;
 231
 232
 233         /* cf. IEEE 802.11 9.2.12 */
 234         for (i = 0; i < bss->supp_rates_len; i++)
 235                 if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
 236                         have_higher_than_11mbit = 1;
 237
 238         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 239             have_higher_than_11mbit)
 240                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 241         else
 242                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 243
 244
 245         if (local->ops->conf_tx) {
 246                 struct ieee80211_tx_queue_params qparam;
 247
 248                 memset(&qparam, 0, sizeof(qparam));
 249
 250                 qparam.aifs = 2;
 251
 252                 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 253                     !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
 254                         qparam.cw_min = 31;
 255                 else
 256                         qparam.cw_min = 15;
 257
 258                 qparam.cw_max = 1023;
 259                 qparam.txop = 0;
 260
 261                 for (i = IEEE80211_TX_QUEUE_DATA0; i < NUM_TX_DATA_QUEUES; i++)
 262                         local->ops->conf_tx(local_to_hw(local),
 263                                            i + IEEE80211_TX_QUEUE_DATA0,
 264                                            &qparam);
 265
 266                 if (ibss) {
 267                         /* IBSS uses different parameters for Beacon sending */
 268                         qparam.cw_min++;
 269                         qparam.cw_min *= 2;
 270                         qparam.cw_min--;
 271                         local->ops->conf_tx(local_to_hw(local),
 272                                            IEEE80211_TX_QUEUE_BEACON, &qparam);
 273                 }
 274         }
 275 }
 276
 277 static void ieee80211_sta_wmm_params(struct net_device *dev,
 278                                      struct ieee80211_if_sta *ifsta,
 279                                      u8 *wmm_param, size_t wmm_param_len)
 280 {
 281         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 282         struct ieee80211_tx_queue_params params;
 283         size_t left;
 284         int count;
 285         u8 *pos;
 286
 287         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 288                 return;
 289         count = wmm_param[6] & 0x0f;
 290         if (count == ifsta->wmm_last_param_set)
 291                 return;
 292         ifsta->wmm_last_param_set = count;
 293
 294         pos = wmm_param + 8;
 295         left = wmm_param_len - 8;
 296
 297         memset(&params, 0, sizeof(params));
 298
 299         if (!local->ops->conf_tx)
 300                 return;
 301
 302         local->wmm_acm = 0;
 303         for (; left >= 4; left -= 4, pos += 4) {
 304                 int aci = (pos[0] >> 5) & 0x03;
 305                 int acm = (pos[0] >> 4) & 0x01;
 306                 int queue;
 307
 308                 switch (aci) {
 309                 case 1:
 310                         queue = IEEE80211_TX_QUEUE_DATA3;
 311                         if (acm) {
 312                                 local->wmm_acm |= BIT(0) | BIT(3);
 313                         }
 314                         break;
 315                 case 2:
 316                         queue = IEEE80211_TX_QUEUE_DATA1;
 317                         if (acm) {
 318                                 local->wmm_acm |= BIT(4) | BIT(5);
 319                         }
 320                         break;
 321                 case 3:
 322                         queue = IEEE80211_TX_QUEUE_DATA0;
 323                         if (acm) {
 324                                 local->wmm_acm |= BIT(6) | BIT(7);
 325                         }
 326                         break;
 327                 case 0:
 328                 default:
 329                         queue = IEEE80211_TX_QUEUE_DATA2;
 330                         if (acm) {
 331                                 local->wmm_acm |= BIT(1) | BIT(2);
 332                         }
 333                         break;
 334                 }
 335
 336                 params.aifs = pos[0] & 0x0f;
 337                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 338                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 339                 params.txop = pos[2] | (pos[3] << 8);
 340 #ifdef CONFIG_MAC80211_DEBUG
 341                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 342                        "cWmin=%d cWmax=%d txop=%d\n",
 343                        dev->name, queue, aci, acm, params.aifs, params.cw_min,
 344                        params.cw_max, params.txop);
 345 #endif
 346                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 347                  * AC for now) */
 348                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 349                         printk(KERN_DEBUG "%s: failed to set TX queue "
 350                                "parameters for queue %d\n", dev->name, queue);
 351                 }
 352         }
 353 }
 354
 355
 356 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
 357                                    u8 erp_value)
 358 {
 359         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
 360         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 361         bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
 362         bool preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
 363         DECLARE_MAC_BUF(mac);
 364         u32 changed = 0;
 365
 366         if (use_protection != bss_conf->use_cts_prot) {
 367                 if (net_ratelimit()) {
 368                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
 369                                "%s)\n",
 370                                sdata->dev->name,
 371                                use_protection ? "enabled" : "disabled",
 372                                print_mac(mac, ifsta->bssid));
 373                 }
 374                 bss_conf->use_cts_prot = use_protection;
 375                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 376         }
 377
 378         if (preamble_mode != bss_conf->use_short_preamble) {
 379                 if (net_ratelimit()) {
 380                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 381                                " (BSSID=%s)\n",
 382                                sdata->dev->name,
 383                                (preamble_mode == WLAN_ERP_PREAMBLE_SHORT) ?
 384                                         "short" : "long",
 385                                print_mac(mac, ifsta->bssid));
 386                 }
 387                 bss_conf->use_short_preamble = preamble_mode;
 388                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 389         }
 390
 391         return changed;
 392 }
 393
 394 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
 395                                    struct ieee80211_ht_info *ht_info)
 396 {
 397
 398         if (ht_info == NULL)
 399                 return -EINVAL;
 400
 401         memset(ht_info, 0, sizeof(*ht_info));
 402
 403         if (ht_cap_ie) {
 404                 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
 405
 406                 ht_info->ht_supported = 1;
 407                 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
 408                 ht_info->ampdu_factor =
 409                         ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
 410                 ht_info->ampdu_density =
 411                         (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
 412                 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
 413         } else
 414                 ht_info->ht_supported = 0;
 415
 416         return 0;
 417 }
 418
 419 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
 420                         struct ieee80211_ht_addt_info *ht_add_info_ie,
 421                         struct ieee80211_ht_bss_info *bss_info)
 422 {
 423         if (bss_info == NULL)
 424                 return -EINVAL;
 425
 426         memset(bss_info, 0, sizeof(*bss_info));
 427
 428         if (ht_add_info_ie) {
 429                 u16 op_mode;
 430                 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
 431
 432                 bss_info->primary_channel = ht_add_info_ie->control_chan;
 433                 bss_info->bss_cap = ht_add_info_ie->ht_param;
 434                 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
 435         }
 436
 437         return 0;
 438 }
 439
 440 static void ieee80211_sta_send_associnfo(struct net_device *dev,
 441                                          struct ieee80211_if_sta *ifsta)
 442 {
 443         char *buf;
 444         size_t len;
 445         int i;
 446         union iwreq_data wrqu;
 447
 448         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 449                 return;
 450
 451         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 452                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 453         if (!buf)
 454                 return;
 455
 456         len = sprintf(buf, "ASSOCINFO(");
 457         if (ifsta->assocreq_ies) {
 458                 len += sprintf(buf + len, "ReqIEs=");
 459                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 460                         len += sprintf(buf + len, "%02x",
 461                                        ifsta->assocreq_ies[i]);
 462                 }
 463         }
 464         if (ifsta->assocresp_ies) {
 465                 if (ifsta->assocreq_ies)
 466                         len += sprintf(buf + len, " ");
 467                 len += sprintf(buf + len, "RespIEs=");
 468                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 469                         len += sprintf(buf + len, "%02x",
 470                                        ifsta->assocresp_ies[i]);
 471                 }
 472         }
 473         len += sprintf(buf + len, ")");
 474
 475         if (len > IW_CUSTOM_MAX) {
 476                 len = sprintf(buf, "ASSOCRESPIE=");
 477                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 478                         len += sprintf(buf + len, "%02x",
 479                                        ifsta->assocresp_ies[i]);
 480                 }
 481         }
 482
 483         memset(&wrqu, 0, sizeof(wrqu));
 484         wrqu.data.length = len;
 485         wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 486
 487         kfree(buf);
 488 }
 489
 490
 491 static void ieee80211_set_associated(struct net_device *dev,
 492                                      struct ieee80211_if_sta *ifsta,
 493                                      bool assoc)
 494 {
 495         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 496         struct ieee80211_local *local = sdata->local;
 497         union iwreq_data wrqu;
 498         u32 changed = BSS_CHANGED_ASSOC;
 499
 500         if (assoc) {
 501                 struct ieee80211_sta_bss *bss;
 502
 503                 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 504
 505                 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
 506                         return;
 507
 508                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
 509                                            local->hw.conf.channel->center_freq,
 510                                            ifsta->ssid, ifsta->ssid_len);
 511                 if (bss) {
 512                         if (bss->has_erp_value)
 513                                 changed |= ieee80211_handle_erp_ie(
 514                                                 sdata, bss->erp_value);
 515                         ieee80211_rx_bss_put(dev, bss);
 516                 }
 517
 518                 netif_carrier_on(dev);
 519                 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 520                 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 521                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 522                 ieee80211_sta_send_associnfo(dev, ifsta);
 523         } else {
 524                 ieee80211_sta_tear_down_BA_sessions(dev, ifsta->bssid);
 525                 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 526                 netif_carrier_off(dev);
 527                 ieee80211_reset_erp_info(dev);
 528                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 529         }
 530         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 531         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 532         ifsta->last_probe = jiffies;
 533         ieee80211_led_assoc(local, assoc);
 534
 535         sdata->bss_conf.assoc = assoc;
 536         ieee80211_bss_info_change_notify(sdata, changed);
 537 }
 538
 539 static void ieee80211_set_disassoc(struct net_device *dev,
 540                                    struct ieee80211_if_sta *ifsta, int deauth)
 541 {
 542         if (deauth)
 543                 ifsta->auth_tries = 0;
 544         ifsta->assoc_tries = 0;
 545         ieee80211_set_associated(dev, ifsta, 0);
 546 }
 547
 548 void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
 549                       int encrypt)
 550 {
 551         struct ieee80211_sub_if_data *sdata;
 552         struct ieee80211_tx_packet_data *pkt_data;
 553
 554         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 555         skb->dev = sdata->local->mdev;
 556         skb_set_mac_header(skb, 0);
 557         skb_set_network_header(skb, 0);
 558         skb_set_transport_header(skb, 0);
 559
 560         pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 561         memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
 562         pkt_data->ifindex = sdata->dev->ifindex;
 563         if (!encrypt)
 564                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 565
 566         dev_queue_xmit(skb);
 567 }
 568
 569
 570 static void ieee80211_send_auth(struct net_device *dev,
 571                                 struct ieee80211_if_sta *ifsta,
 572                                 int transaction, u8 *extra, size_t extra_len,
 573                                 int encrypt)
 574 {
 575         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 576         struct sk_buff *skb;
 577         struct ieee80211_mgmt *mgmt;
 578
 579         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 580                             sizeof(*mgmt) + 6 + extra_len);
 581         if (!skb) {
 582                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 583                        "frame\n", dev->name);
 584                 return;
 585         }
 586         skb_reserve(skb, local->hw.extra_tx_headroom);
 587
 588         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 589         memset(mgmt, 0, 24 + 6);
 590         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 591                                            IEEE80211_STYPE_AUTH);
 592         if (encrypt)
 593                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 594         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 595         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 596         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 597         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 598         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 599         ifsta->auth_transaction = transaction + 1;
 600         mgmt->u.auth.status_code = cpu_to_le16(0);
 601         if (extra)
 602                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 603
 604         ieee80211_sta_tx(dev, skb, encrypt);
 605 }
 606
 607
 608 static void ieee80211_authenticate(struct net_device *dev,
 609                                    struct ieee80211_if_sta *ifsta)
 610 {
 611         DECLARE_MAC_BUF(mac);
 612
 613         ifsta->auth_tries++;
 614         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 615                 printk(KERN_DEBUG "%s: authentication with AP %s"
 616                        " timed out\n",
 617                        dev->name, print_mac(mac, ifsta->bssid));
 618                 ifsta->state = IEEE80211_DISABLED;
 619                 return;
 620         }
 621
 622         ifsta->state = IEEE80211_AUTHENTICATE;
 623         printk(KERN_DEBUG "%s: authenticate with AP %s\n",
 624                dev->name, print_mac(mac, ifsta->bssid));
 625
 626         ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
 627
 628         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 629 }
 630
 631
 632 static void ieee80211_send_assoc(struct net_device *dev,
 633                                  struct ieee80211_if_sta *ifsta)
 634 {
 635         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 636         struct sk_buff *skb;
 637         struct ieee80211_mgmt *mgmt;
 638         u8 *pos, *ies;
 639         int i, len;
 640         u16 capab;
 641         struct ieee80211_sta_bss *bss;
 642         int wmm = 0;
 643         struct ieee80211_supported_band *sband;
 644
 645         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 646                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 647                             ifsta->ssid_len);
 648         if (!skb) {
 649                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 650                        "frame\n", dev->name);
 651                 return;
 652         }
 653         skb_reserve(skb, local->hw.extra_tx_headroom);
 654
 655         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 656
 657         capab = ifsta->capab;
 658
 659         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 660                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 661                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 662                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 663                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 664         }
 665
 666         bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
 667                                    local->hw.conf.channel->center_freq,
 668                                    ifsta->ssid, ifsta->ssid_len);
 669         if (bss) {
 670                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 671                         capab |= WLAN_CAPABILITY_PRIVACY;
 672                 if (bss->wmm_ie) {
 673                         wmm = 1;
 674                 }
 675                 ieee80211_rx_bss_put(dev, bss);
 676         }
 677
 678         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 679         memset(mgmt, 0, 24);
 680         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 681         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 682         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 683
 684         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 685                 skb_put(skb, 10);
 686                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 687                                                    IEEE80211_STYPE_REASSOC_REQ);
 688                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 689                 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
 690                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 691                        ETH_ALEN);
 692         } else {
 693                 skb_put(skb, 4);
 694                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 695                                                    IEEE80211_STYPE_ASSOC_REQ);
 696                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 697                 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
 698         }
 699
 700         /* SSID */
 701         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 702         *pos++ = WLAN_EID_SSID;
 703         *pos++ = ifsta->ssid_len;
 704         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 705
 706         len = sband->n_bitrates;
 707         if (len > 8)
 708                 len = 8;
 709         pos = skb_put(skb, len + 2);
 710         *pos++ = WLAN_EID_SUPP_RATES;
 711         *pos++ = len;
 712         for (i = 0; i < len; i++) {
 713                 int rate = sband->bitrates[i].bitrate;
 714                 *pos++ = (u8) (rate / 5);
 715         }
 716
 717         if (sband->n_bitrates > len) {
 718                 pos = skb_put(skb, sband->n_bitrates - len + 2);
 719                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 720                 *pos++ = sband->n_bitrates - len;
 721                 for (i = len; i < sband->n_bitrates; i++) {
 722                         int rate = sband->bitrates[i].bitrate;
 723                         *pos++ = (u8) (rate / 5);
 724                 }
 725         }
 726
 727         if (ifsta->extra_ie) {
 728                 pos = skb_put(skb, ifsta->extra_ie_len);
 729                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 730         }
 731
 732         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 733                 pos = skb_put(skb, 9);
 734                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 735                 *pos++ = 7; /* len */
 736                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 737                 *pos++ = 0x50;
 738                 *pos++ = 0xf2;
 739                 *pos++ = 2; /* WME */
 740                 *pos++ = 0; /* WME info */
 741                 *pos++ = 1; /* WME ver */
 742                 *pos++ = 0;
 743         }
 744         /* wmm support is a must to HT */
 745         if (wmm && sband->ht_info.ht_supported) {
 746                 __le16 tmp = cpu_to_le16(sband->ht_info.cap);
 747                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 748                 *pos++ = WLAN_EID_HT_CAPABILITY;
 749                 *pos++ = sizeof(struct ieee80211_ht_cap);
 750                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 751                 memcpy(pos, &tmp, sizeof(u16));
 752                 pos += sizeof(u16);
 753                 /* TODO: needs a define here for << 2 */
 754                 *pos++ = sband->ht_info.ampdu_factor |
 755                          (sband->ht_info.ampdu_density << 2);
 756                 memcpy(pos, sband->ht_info.supp_mcs_set, 16);
 757         }
 758
 759         kfree(ifsta->assocreq_ies);
 760         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 761         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 762         if (ifsta->assocreq_ies)
 763                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 764
 765         ieee80211_sta_tx(dev, skb, 0);
 766 }
 767
 768
 769 static void ieee80211_send_deauth(struct net_device *dev,
 770                                   struct ieee80211_if_sta *ifsta, u16 reason)
 771 {
 772         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 773         struct sk_buff *skb;
 774         struct ieee80211_mgmt *mgmt;
 775
 776         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 777         if (!skb) {
 778                 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
 779                        "frame\n", dev->name);
 780                 return;
 781         }
 782         skb_reserve(skb, local->hw.extra_tx_headroom);
 783
 784         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 785         memset(mgmt, 0, 24);
 786         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 787         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 788         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 789         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 790                                            IEEE80211_STYPE_DEAUTH);
 791         skb_put(skb, 2);
 792         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 793
 794         ieee80211_sta_tx(dev, skb, 0);
 795 }
 796
 797
 798 static void ieee80211_send_disassoc(struct net_device *dev,
 799                                     struct ieee80211_if_sta *ifsta, u16 reason)
 800 {
 801         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 802         struct sk_buff *skb;
 803         struct ieee80211_mgmt *mgmt;
 804
 805         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 806         if (!skb) {
 807                 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
 808                        "frame\n", dev->name);
 809                 return;
 810         }
 811         skb_reserve(skb, local->hw.extra_tx_headroom);
 812
 813         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 814         memset(mgmt, 0, 24);
 815         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 816         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 817         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 818         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 819                                            IEEE80211_STYPE_DISASSOC);
 820         skb_put(skb, 2);
 821         mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
 822
 823         ieee80211_sta_tx(dev, skb, 0);
 824 }
 825
 826
 827 static int ieee80211_privacy_mismatch(struct net_device *dev,
 828                                       struct ieee80211_if_sta *ifsta)
 829 {
 830         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 831         struct ieee80211_sta_bss *bss;
 832         int bss_privacy;
 833         int wep_privacy;
 834         int privacy_invoked;
 835
 836         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
 837                 return 0;
 838
 839         bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
 840                                    local->hw.conf.channel->center_freq,
 841                                    ifsta->ssid, ifsta->ssid_len);
 842         if (!bss)
 843                 return 0;
 844
 845         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
 846         wep_privacy = !!ieee80211_sta_wep_configured(dev);
 847         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
 848
 849         ieee80211_rx_bss_put(dev, bss);
 850
 851         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 852                 return 0;
 853
 854         return 1;
 855 }
 856
 857
 858 static void ieee80211_associate(struct net_device *dev,
 859                                 struct ieee80211_if_sta *ifsta)
 860 {
 861         DECLARE_MAC_BUF(mac);
 862
 863         ifsta->assoc_tries++;
 864         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 865                 printk(KERN_DEBUG "%s: association with AP %s"
 866                        " timed out\n",
 867                        dev->name, print_mac(mac, ifsta->bssid));
 868                 ifsta->state = IEEE80211_DISABLED;
 869                 return;
 870         }
 871
 872         ifsta->state = IEEE80211_ASSOCIATE;
 873         printk(KERN_DEBUG "%s: associate with AP %s\n",
 874                dev->name, print_mac(mac, ifsta->bssid));
 875         if (ieee80211_privacy_mismatch(dev, ifsta)) {
 876                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 877                        "mixed-cell disabled - abort association\n", dev->name);
 878                 ifsta->state = IEEE80211_DISABLED;
 879                 return;
 880         }
 881
 882         ieee80211_send_assoc(dev, ifsta);
 883
 884         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 885 }
 886
 887
 888 static void ieee80211_associated(struct net_device *dev,
 889                                  struct ieee80211_if_sta *ifsta)
 890 {
 891         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 892         struct sta_info *sta;
 893         int disassoc;
 894         DECLARE_MAC_BUF(mac);
 895
 896         /* TODO: start monitoring current AP signal quality and number of
 897          * missed beacons. Scan other channels every now and then and search
 898          * for better APs. */
 899         /* TODO: remove expired BSSes */
 900
 901         ifsta->state = IEEE80211_ASSOCIATED;
 902
 903         rcu_read_lock();
 904
 905         sta = sta_info_get(local, ifsta->bssid);
 906         if (!sta) {
 907                 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
 908                        dev->name, print_mac(mac, ifsta->bssid));
 909                 disassoc = 1;
 910         } else {
 911                 disassoc = 0;
 912                 if (time_after(jiffies,
 913                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 914                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
 915                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 916                                        "current AP %s - assume out of "
 917                                        "range\n",
 918                                        dev->name, print_mac(mac, ifsta->bssid));
 919                                 disassoc = 1;
 920                                 sta_info_unlink(&sta);
 921                         } else
 922                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 923                                                          local->scan_ssid,
 924                                                          local->scan_ssid_len);
 925                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 926                 } else {
 927                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 928                         if (time_after(jiffies, ifsta->last_probe +
 929                                        IEEE80211_PROBE_INTERVAL)) {
 930                                 ifsta->last_probe = jiffies;
 931                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 932                                                          ifsta->ssid,
 933                                                          ifsta->ssid_len);
 934                         }
 935                 }
 936         }
 937
 938         rcu_read_unlock();
 939
 940         if (disassoc && sta) {
 941                 rtnl_lock();
 942                 sta_info_destroy(sta);
 943                 rtnl_unlock();
 944         }
 945
 946         if (disassoc) {
 947                 ifsta->state = IEEE80211_DISABLED;
 948                 ieee80211_set_associated(dev, ifsta, 0);
 949         } else {
 950                 mod_timer(&ifsta->timer, jiffies +
 951                                       IEEE80211_MONITORING_INTERVAL);
 952         }
 953 }
 954
 955
 956 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
 957                                      u8 *ssid, size_t ssid_len)
 958 {
 959         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 960         struct ieee80211_supported_band *sband;
 961         struct sk_buff *skb;
 962         struct ieee80211_mgmt *mgmt;
 963         u8 *pos, *supp_rates, *esupp_rates = NULL;
 964         int i;
 965
 966         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 967         if (!skb) {
 968                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 969                        "request\n", dev->name);
 970                 return;
 971         }
 972         skb_reserve(skb, local->hw.extra_tx_headroom);
 973
 974         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 975         memset(mgmt, 0, 24);
 976         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 977                                            IEEE80211_STYPE_PROBE_REQ);
 978         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 979         if (dst) {
 980                 memcpy(mgmt->da, dst, ETH_ALEN);
 981                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 982         } else {
 983                 memset(mgmt->da, 0xff, ETH_ALEN);
 984                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 985         }
 986         pos = skb_put(skb, 2 + ssid_len);
 987         *pos++ = WLAN_EID_SSID;
 988         *pos++ = ssid_len;
 989         memcpy(pos, ssid, ssid_len);
 990
 991         supp_rates = skb_put(skb, 2);
 992         supp_rates[0] = WLAN_EID_SUPP_RATES;
 993         supp_rates[1] = 0;
 994         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 995
 996         for (i = 0; i < sband->n_bitrates; i++) {
 997                 struct ieee80211_rate *rate = &sband->bitrates[i];
 998                 if (esupp_rates) {
 999                         pos = skb_put(skb, 1);
1000                         esupp_rates[1]++;
1001                 } else if (supp_rates[1] == 8) {
1002                         esupp_rates = skb_put(skb, 3);
1003                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
1004                         esupp_rates[1] = 1;
1005                         pos = &esupp_rates[2];
1006                 } else {
1007                         pos = skb_put(skb, 1);
1008                         supp_rates[1]++;
1009                 }
1010                 *pos = rate->bitrate / 5;
1011         }
1012
1013         ieee80211_sta_tx(dev, skb, 0);
1014 }
1015
1016
1017 static int ieee80211_sta_wep_configured(struct net_device *dev)
1018 {
1019         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1020         if (!sdata || !sdata->default_key ||
1021             sdata->default_key->conf.alg != ALG_WEP)
1022                 return 0;
1023         return 1;
1024 }
1025
1026
1027 static void ieee80211_auth_completed(struct net_device *dev,
1028                                      struct ieee80211_if_sta *ifsta)
1029 {
1030         printk(KERN_DEBUG "%s: authenticated\n", dev->name);
1031         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1032         ieee80211_associate(dev, ifsta);
1033 }
1034
1035
1036 static void ieee80211_auth_challenge(struct net_device *dev,
1037                                      struct ieee80211_if_sta *ifsta,
1038                                      struct ieee80211_mgmt *mgmt,
1039                                      size_t len)
1040 {
1041         u8 *pos;
1042         struct ieee802_11_elems elems;
1043
1044         printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
1045         pos = mgmt->u.auth.variable;
1046         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1047         if (!elems.challenge) {
1048                 printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
1049                        "frame\n", dev->name);
1050                 return;
1051         }
1052         ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
1053                             elems.challenge_len + 2, 1);
1054 }
1055
1056 static void ieee80211_send_addba_resp(struct net_device *dev, u8 *da, u16 tid,
1057                                         u8 dialog_token, u16 status, u16 policy,
1058                                         u16 buf_size, u16 timeout)
1059 {
1060         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1061         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1062         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1063         struct sk_buff *skb;
1064         struct ieee80211_mgmt *mgmt;
1065         u16 capab;
1066
1067         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom + 1 +
1068                                         sizeof(mgmt->u.action.u.addba_resp));
1069         if (!skb) {
1070                 printk(KERN_DEBUG "%s: failed to allocate buffer "
1071                        "for addba resp frame\n", dev->name);
1072                 return;
1073         }
1074
1075         skb_reserve(skb, local->hw.extra_tx_headroom);
1076         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1077         memset(mgmt, 0, 24);
1078         memcpy(mgmt->da, da, ETH_ALEN);
1079         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1080         if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1081                 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1082         else
1083                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1084         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1085                                            IEEE80211_STYPE_ACTION);
1086
1087         skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1088         mgmt->u.action.category = WLAN_CATEGORY_BACK;
1089         mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1090         mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1091
1092         capab = (u16)(policy << 1);     /* bit 1 aggregation policy */
1093         capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
1094         capab |= (u16)(buf_size << 6);  /* bit 15:6 max size of aggregation */
1095
1096         mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1097         mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1098         mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1099
1100         ieee80211_sta_tx(dev, skb, 0);
1101
1102         return;
1103 }
1104
1105 void ieee80211_send_addba_request(struct net_device *dev, const u8 *da,
1106                                 u16 tid, u8 dialog_token, u16 start_seq_num,
1107                                 u16 agg_size, u16 timeout)
1108 {
1109         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1110         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1111         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1112         struct sk_buff *skb;
1113         struct ieee80211_mgmt *mgmt;
1114         u16 capab;
1115
1116         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom + 1 +
1117                                 sizeof(mgmt->u.action.u.addba_req));
1118
1119
1120         if (!skb) {
1121                 printk(KERN_ERR "%s: failed to allocate buffer "
1122                                 "for addba request frame\n", dev->name);
1123                 return;
1124         }
1125         skb_reserve(skb, local->hw.extra_tx_headroom);
1126         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1127         memset(mgmt, 0, 24);
1128         memcpy(mgmt->da, da, ETH_ALEN);
1129         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1130         if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1131                 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1132         else
1133                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1134
1135         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1136                                         IEEE80211_STYPE_ACTION);
1137
1138         skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
1139
1140         mgmt->u.action.category = WLAN_CATEGORY_BACK;
1141         mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
1142
1143         mgmt->u.action.u.addba_req.dialog_token = dialog_token;
1144         capab = (u16)(1 << 1);          /* bit 1 aggregation policy */
1145         capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
1146         capab |= (u16)(agg_size << 6);  /* bit 15:6 max size of aggergation */
1147
1148         mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
1149
1150         mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
1151         mgmt->u.action.u.addba_req.start_seq_num =
1152                                         cpu_to_le16(start_seq_num << 4);
1153
1154         ieee80211_sta_tx(dev, skb, 0);
1155 }
1156
1157 static void ieee80211_sta_process_addba_request(struct net_device *dev,
1158                                                 struct ieee80211_mgmt *mgmt,
1159                                                 size_t len)
1160 {
1161         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1162         struct ieee80211_hw *hw = &local->hw;
1163         struct ieee80211_conf *conf = &hw->conf;
1164         struct sta_info *sta;
1165         struct tid_ampdu_rx *tid_agg_rx;
1166         u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1167         u8 dialog_token;
1168         int ret = -EOPNOTSUPP;
1169         DECLARE_MAC_BUF(mac);
1170
1171         rcu_read_lock();
1172
1173         sta = sta_info_get(local, mgmt->sa);
1174         if (!sta) {
1175                 rcu_read_unlock();
1176                 return;
1177         }
1178
1179         /* extract session parameters from addba request frame */
1180         dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1181         timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1182         start_seq_num =
1183                 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1184
1185         capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1186         ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1187         tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1188         buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1189
1190         status = WLAN_STATUS_REQUEST_DECLINED;
1191
1192         /* sanity check for incoming parameters:
1193          * check if configuration can support the BA policy
1194          * and if buffer size does not exceeds max value */
1195         if (((ba_policy != 1)
1196                 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1197                 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1198                 status = WLAN_STATUS_INVALID_QOS_PARAM;
1199 #ifdef CONFIG_MAC80211_HT_DEBUG
1200                 if (net_ratelimit())
1201                         printk(KERN_DEBUG "AddBA Req with bad params from "
1202                                 "%s on tid %u. policy %d, buffer size %d\n",
1203                                 print_mac(mac, mgmt->sa), tid, ba_policy,
1204                                 buf_size);
1205 #endif /* CONFIG_MAC80211_HT_DEBUG */
1206                 goto end_no_lock;
1207         }
1208         /* determine default buffer size */
1209         if (buf_size == 0) {
1210                 struct ieee80211_supported_band *sband;
1211
1212                 sband = local->hw.wiphy->bands[conf->channel->band];
1213                 buf_size = IEEE80211_MIN_AMPDU_BUF;
1214                 buf_size = buf_size << sband->ht_info.ampdu_factor;
1215         }
1216
1217
1218         /* examine state machine */
1219         spin_lock_bh(&sta->ampdu_mlme.ampdu_rx);
1220
1221         if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1222 #ifdef CONFIG_MAC80211_HT_DEBUG
1223                 if (net_ratelimit())
1224                         printk(KERN_DEBUG "unexpected AddBA Req from "
1225                                 "%s on tid %u\n",
1226                                 print_mac(mac, mgmt->sa), tid);
1227 #endif /* CONFIG_MAC80211_HT_DEBUG */
1228                 goto end;
1229         }
1230
1231         /* prepare A-MPDU MLME for Rx aggregation */
1232         sta->ampdu_mlme.tid_rx[tid] =
1233                         kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
1234         if (!sta->ampdu_mlme.tid_rx[tid]) {
1235                 if (net_ratelimit())
1236                         printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
1237                                         tid);
1238                 goto end;
1239         }
1240         /* rx timer */
1241         sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
1242                                 sta_rx_agg_session_timer_expired;
1243         sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
1244                                 (unsigned long)&sta->timer_to_tid[tid];
1245         init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1246
1247         tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
1248
1249         /* prepare reordering buffer */
1250         tid_agg_rx->reorder_buf =
1251                 kmalloc(buf_size * sizeof(struct sk_buf *), GFP_ATOMIC);
1252         if (!tid_agg_rx->reorder_buf) {
1253                 if (net_ratelimit())
1254                         printk(KERN_ERR "can not allocate reordering buffer "
1255                                "to tid %d\n", tid);
1256                 kfree(sta->ampdu_mlme.tid_rx[tid]);
1257                 goto end;
1258         }
1259         memset(tid_agg_rx->reorder_buf, 0,
1260                 buf_size * sizeof(struct sk_buf *));
1261
1262         if (local->ops->ampdu_action)
1263                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1264                                                sta->addr, tid, &start_seq_num);
1265 #ifdef CONFIG_MAC80211_HT_DEBUG
1266         printk(KERN_DEBUG "Rx A-MPDU on tid %d result %d", tid, ret);
1267 #endif /* CONFIG_MAC80211_HT_DEBUG */
1268
1269         if (ret) {
1270                 kfree(tid_agg_rx->reorder_buf);
1271                 kfree(tid_agg_rx);
1272                 sta->ampdu_mlme.tid_rx[tid] = NULL;
1273                 goto end;
1274         }
1275
1276         /* change state and send addba resp */
1277         sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1278         tid_agg_rx->dialog_token = dialog_token;
1279         tid_agg_rx->ssn = start_seq_num;
1280         tid_agg_rx->head_seq_num = start_seq_num;
1281         tid_agg_rx->buf_size = buf_size;
1282         tid_agg_rx->timeout = timeout;
1283         tid_agg_rx->stored_mpdu_num = 0;
1284         status = WLAN_STATUS_SUCCESS;
1285 end:
1286         spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);
1287
1288 end_no_lock:
1289         ieee80211_send_addba_resp(sta->sdata->dev, sta->addr, tid,
1290                                   dialog_token, status, 1, buf_size, timeout);
1291         rcu_read_unlock();
1292 }
1293
1294 static void ieee80211_sta_process_addba_resp(struct net_device *dev,
1295                                              struct ieee80211_mgmt *mgmt,
1296                                              size_t len)
1297 {
1298         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1299         struct ieee80211_hw *hw = &local->hw;
1300         struct sta_info *sta;
1301         u16 capab;
1302         u16 tid;
1303         u8 *state;
1304
1305         rcu_read_lock();
1306
1307         sta = sta_info_get(local, mgmt->sa);
1308         if (!sta) {
1309                 rcu_read_unlock();
1310                 return;
1311         }
1312
1313         capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
1314         tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1315
1316         state = &sta->ampdu_mlme.tid_state_tx[tid];
1317
1318         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
1319
1320         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1321                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
1322                 printk(KERN_DEBUG "state not HT_ADDBA_REQUESTED_MSK:"
1323                         "%d\n", *state);
1324                 goto addba_resp_exit;
1325         }
1326
1327         if (mgmt->u.action.u.addba_resp.dialog_token !=
1328                 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1329                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
1330 #ifdef CONFIG_MAC80211_HT_DEBUG
1331                 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
1332 #endif /* CONFIG_MAC80211_HT_DEBUG */
1333                 goto addba_resp_exit;
1334         }
1335
1336         del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1337 #ifdef CONFIG_MAC80211_HT_DEBUG
1338         printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
1339 #endif /* CONFIG_MAC80211_HT_DEBUG */
1340         if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
1341                         == WLAN_STATUS_SUCCESS) {
1342                 if (*state & HT_ADDBA_RECEIVED_MSK)
1343                         printk(KERN_DEBUG "double addBA response\n");
1344
1345                 *state |= HT_ADDBA_RECEIVED_MSK;
1346                 sta->ampdu_mlme.addba_req_num[tid] = 0;
1347
1348                 if (*state == HT_AGG_STATE_OPERATIONAL) {
1349                         printk(KERN_DEBUG "Aggregation on for tid %d \n", tid);
1350                         ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
1351                 }
1352
1353                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
1354                 printk(KERN_DEBUG "recipient accepted agg: tid %d \n", tid);
1355         } else {
1356                 printk(KERN_DEBUG "recipient rejected agg: tid %d \n", tid);
1357
1358                 sta->ampdu_mlme.addba_req_num[tid]++;
1359                 /* this will allow the state check in stop_BA_session */
1360                 *state = HT_AGG_STATE_OPERATIONAL;
1361                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
1362                 ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
1363                                              WLAN_BACK_INITIATOR);
1364         }
1365
1366 addba_resp_exit:
1367         rcu_read_unlock();
1368 }
1369
1370 void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
1371                           u16 initiator, u16 reason_code)
1372 {
1373         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1374         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1375         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1376         struct sk_buff *skb;
1377         struct ieee80211_mgmt *mgmt;
1378         u16 params;
1379
1380         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom + 1 +
1381                                         sizeof(mgmt->u.action.u.delba));
1382
1383         if (!skb) {
1384                 printk(KERN_ERR "%s: failed to allocate buffer "
1385                                         "for delba frame\n", dev->name);
1386                 return;
1387         }
1388
1389         skb_reserve(skb, local->hw.extra_tx_headroom);
1390         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1391         memset(mgmt, 0, 24);
1392         memcpy(mgmt->da, da, ETH_ALEN);
1393         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1394         if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1395                 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1396         else
1397                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1398         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1399                                         IEEE80211_STYPE_ACTION);
1400
1401         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1402
1403         mgmt->u.action.category = WLAN_CATEGORY_BACK;
1404         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1405         params = (u16)(initiator << 11);        /* bit 11 initiator */
1406         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
1407
1408         mgmt->u.action.u.delba.params = cpu_to_le16(params);
1409         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1410
1411         ieee80211_sta_tx(dev, skb, 0);
1412 }
1413
1414 void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid,
1415                                         u16 initiator, u16 reason)
1416 {
1417         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1418         struct ieee80211_hw *hw = &local->hw;
1419         struct sta_info *sta;
1420         int ret, i;
1421
1422         rcu_read_lock();
1423
1424         sta = sta_info_get(local, ra);
1425         if (!sta) {
1426                 rcu_read_unlock();
1427                 return;
1428         }
1429
1430         /* check if TID is in operational state */
1431         spin_lock_bh(&sta->ampdu_mlme.ampdu_rx);
1432         if (sta->ampdu_mlme.tid_state_rx[tid]
1433                                 != HT_AGG_STATE_OPERATIONAL) {
1434                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);
1435                 rcu_read_unlock();
1436                 return;
1437         }
1438         sta->ampdu_mlme.tid_state_rx[tid] =
1439                 HT_AGG_STATE_REQ_STOP_BA_MSK |
1440                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1441                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);
1442
1443         /* stop HW Rx aggregation. ampdu_action existence
1444          * already verified in session init so we add the BUG_ON */
1445         BUG_ON(!local->ops->ampdu_action);
1446
1447         ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1448                                         ra, tid, NULL);
1449         if (ret)
1450                 printk(KERN_DEBUG "HW problem - can not stop rx "
1451                                 "aggergation for tid %d\n", tid);
1452
1453         /* shutdown timer has not expired */
1454         if (initiator != WLAN_BACK_TIMER)
1455                 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
1456
1457         /* check if this is a self generated aggregation halt */
1458         if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1459                 ieee80211_send_delba(dev, ra, tid, 0, reason);
1460
1461         /* free the reordering buffer */
1462         for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
1463                 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
1464                         /* release the reordered frames */
1465                         dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
1466                         sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
1467                         sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
1468                 }
1469         }
1470         /* free resources */
1471         kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
1472         kfree(sta->ampdu_mlme.tid_rx[tid]);
1473         sta->ampdu_mlme.tid_rx[tid] = NULL;
1474         sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
1475
1476         rcu_read_unlock();
1477 }
1478
1479
1480 static void ieee80211_sta_process_delba(struct net_device *dev,
1481                         struct ieee80211_mgmt *mgmt, size_t len)
1482 {
1483         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1484         struct sta_info *sta;
1485         u16 tid, params;
1486         u16 initiator;
1487         DECLARE_MAC_BUF(mac);
1488
1489         rcu_read_lock();
1490
1491         sta = sta_info_get(local, mgmt->sa);
1492         if (!sta) {
1493                 rcu_read_unlock();
1494                 return;
1495         }
1496
1497         params = le16_to_cpu(mgmt->u.action.u.delba.params);
1498         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1499         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1500
1501 #ifdef CONFIG_MAC80211_HT_DEBUG
1502         if (net_ratelimit())
1503                 printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
1504                         print_mac(mac, mgmt->sa),
1505                         initiator ? "initiator" : "recipient", tid,
1506                         mgmt->u.action.u.delba.reason_code);
1507 #endif /* CONFIG_MAC80211_HT_DEBUG */
1508
1509         if (initiator == WLAN_BACK_INITIATOR)
1510                 ieee80211_sta_stop_rx_ba_session(dev, sta->addr, tid,
1511                                                  WLAN_BACK_INITIATOR, 0);
1512         else { /* WLAN_BACK_RECIPIENT */
1513                 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
1514                 sta->ampdu_mlme.tid_state_tx[tid] =
1515                                 HT_AGG_STATE_OPERATIONAL;
1516                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
1517                 ieee80211_stop_tx_ba_session(&local->hw, sta->addr, tid,
1518                                              WLAN_BACK_RECIPIENT);
1519         }
1520         rcu_read_unlock();
1521 }
1522
1523 /*
1524  * After sending add Block Ack request we activated a timer until
1525  * add Block Ack response will arrive from the recipient.
1526  * If this timer expires sta_addba_resp_timer_expired will be executed.
1527  */
1528 void sta_addba_resp_timer_expired(unsigned long data)
1529 {
1530         /* not an elegant detour, but there is no choice as the timer passes
1531          * only one argument, and both sta_info and TID are needed, so init
1532          * flow in sta_info_create gives the TID as data, while the timer_to_id
1533          * array gives the sta through container_of */
1534         u16 tid = *(int *)data;
1535         struct sta_info *temp_sta = container_of((void *)data,
1536                 struct sta_info, timer_to_tid[tid]);
1537
1538         struct ieee80211_local *local = temp_sta->local;
1539         struct ieee80211_hw *hw = &local->hw;
1540         struct sta_info *sta;
1541         u8 *state;
1542
1543         rcu_read_lock();
1544
1545         sta = sta_info_get(local, temp_sta->addr);
1546         if (!sta) {
1547                 rcu_read_unlock();
1548                 return;
1549         }
1550
1551         state = &sta->ampdu_mlme.tid_state_tx[tid];
1552         /* check if the TID waits for addBA response */
1553         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
1554         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
1555                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
1556                 *state = HT_AGG_STATE_IDLE;
1557                 printk(KERN_DEBUG "timer expired on tid %d but we are not "
1558                                 "expecting addBA response there", tid);
1559                 goto timer_expired_exit;
1560         }
1561
1562         printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
1563
1564         /* go through the state check in stop_BA_session */
1565         *state = HT_AGG_STATE_OPERATIONAL;
1566         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
1567         ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
1568                                      WLAN_BACK_INITIATOR);
1569
1570 timer_expired_exit:
1571         rcu_read_unlock();
1572 }
1573
1574 /*
1575  * After accepting the AddBA Request we activated a timer,
1576  * resetting it after each frame that arrives from the originator.
1577  * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1578  */
1579 void sta_rx_agg_session_timer_expired(unsigned long data)
1580 {
1581         /* not an elegant detour, but there is no choice as the timer passes
1582          * only one argument, and verious sta_info are needed here, so init
1583          * flow in sta_info_create gives the TID as data, while the timer_to_id
1584          * array gives the sta through container_of */
1585         u8 *ptid = (u8 *)data;
1586         u8 *timer_to_id = ptid - *ptid;
1587         struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1588                                          timer_to_tid[0]);
1589
1590         printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1591         ieee80211_sta_stop_rx_ba_session(sta->sdata->dev, sta->addr,
1592                                          (u16)*ptid, WLAN_BACK_TIMER,
1593                                          WLAN_REASON_QSTA_TIMEOUT);
1594 }
1595
1596 void ieee80211_sta_tear_down_BA_sessions(struct net_device *dev, u8 *addr)
1597 {
1598         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1599         int i;
1600
1601         for (i = 0; i <  STA_TID_NUM; i++) {
1602                 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
1603                                              WLAN_BACK_INITIATOR);
1604                 ieee80211_sta_stop_rx_ba_session(dev, addr, i,
1605                                                  WLAN_BACK_RECIPIENT,
1606                                                  WLAN_REASON_QSTA_LEAVE_QBSS);
1607         }
1608 }
1609
1610 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
1611                                    struct ieee80211_if_sta *ifsta,
1612                                    struct ieee80211_mgmt *mgmt,
1613                                    size_t len)
1614 {
1615         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1616         u16 auth_alg, auth_transaction, status_code;
1617         DECLARE_MAC_BUF(mac);
1618
1619         if (ifsta->state != IEEE80211_AUTHENTICATE &&
1620             sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
1621                 printk(KERN_DEBUG "%s: authentication frame received from "
1622                        "%s, but not in authenticate state - ignored\n",
1623                        dev->name, print_mac(mac, mgmt->sa));
1624                 return;
1625         }
1626
1627         if (len < 24 + 6) {
1628                 printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
1629                        "received from %s - ignored\n",
1630                        dev->name, len, print_mac(mac, mgmt->sa));
1631                 return;
1632         }
1633
1634         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1635             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1636                 printk(KERN_DEBUG "%s: authentication frame received from "
1637                        "unknown AP (SA=%s BSSID=%s) - "
1638                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1639                        print_mac(mac, mgmt->bssid));
1640                 return;
1641         }
1642
1643         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1644             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
1645                 printk(KERN_DEBUG "%s: authentication frame received from "
1646                        "unknown BSSID (SA=%s BSSID=%s) - "
1647                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1648                        print_mac(mac, mgmt->bssid));
1649                 return;
1650         }
1651
1652         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1653         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1654         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1655
1656         printk(KERN_DEBUG "%s: RX authentication from %s (alg=%d "
1657                "transaction=%d status=%d)\n",
1658                dev->name, print_mac(mac, mgmt->sa), auth_alg,
1659                auth_transaction, status_code);
1660
1661         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1662                 /* IEEE 802.11 standard does not require authentication in IBSS
1663                  * networks and most implementations do not seem to use it.
1664                  * However, try to reply to authentication attempts if someone
1665                  * has actually implemented this.
1666                  * TODO: Could implement shared key authentication. */
1667                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
1668                         printk(KERN_DEBUG "%s: unexpected IBSS authentication "
1669                                "frame (alg=%d transaction=%d)\n",
1670                                dev->name, auth_alg, auth_transaction);
1671                         return;
1672                 }
1673                 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
1674         }
1675
1676         if (auth_alg != ifsta->auth_alg ||
1677             auth_transaction != ifsta->auth_transaction) {
1678                 printk(KERN_DEBUG "%s: unexpected authentication frame "
1679                        "(alg=%d transaction=%d)\n",
1680                        dev->name, auth_alg, auth_transaction);
1681                 return;
1682         }
1683
1684         if (status_code != WLAN_STATUS_SUCCESS) {
1685                 printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
1686                        "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
1687                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1688                         u8 algs[3];
1689                         const int num_algs = ARRAY_SIZE(algs);
1690                         int i, pos;
1691                         algs[0] = algs[1] = algs[2] = 0xff;
1692                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1693                                 algs[0] = WLAN_AUTH_OPEN;
1694                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1695                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1696                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1697                                 algs[2] = WLAN_AUTH_LEAP;
1698                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1699                                 pos = 0;
1700                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1701                                 pos = 1;
1702                         else
1703                                 pos = 2;
1704                         for (i = 0; i < num_algs; i++) {
1705                                 pos++;
1706                                 if (pos >= num_algs)
1707                                         pos = 0;
1708                                 if (algs[pos] == ifsta->auth_alg ||
1709                                     algs[pos] == 0xff)
1710                                         continue;
1711                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1712                                     !ieee80211_sta_wep_configured(dev))
1713                                         continue;
1714                                 ifsta->auth_alg = algs[pos];
1715                                 printk(KERN_DEBUG "%s: set auth_alg=%d for "
1716                                        "next try\n",
1717                                        dev->name, ifsta->auth_alg);
1718                                 break;
1719                         }
1720                 }
1721                 return;
1722         }
1723
1724         switch (ifsta->auth_alg) {
1725         case WLAN_AUTH_OPEN:
1726         case WLAN_AUTH_LEAP:
1727                 ieee80211_auth_completed(dev, ifsta);
1728                 break;
1729         case WLAN_AUTH_SHARED_KEY:
1730                 if (ifsta->auth_transaction == 4)
1731                         ieee80211_auth_completed(dev, ifsta);
1732                 else
1733                         ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1734                 break;
1735         }
1736 }
1737
1738
1739 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1740                                      struct ieee80211_if_sta *ifsta,
1741                                      struct ieee80211_mgmt *mgmt,
1742                                      size_t len)
1743 {
1744         u16 reason_code;
1745         DECLARE_MAC_BUF(mac);
1746
1747         if (len < 24 + 2) {
1748                 printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
1749                        "received from %s - ignored\n",
1750                        dev->name, len, print_mac(mac, mgmt->sa));
1751                 return;
1752         }
1753
1754         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1755                 printk(KERN_DEBUG "%s: deauthentication frame received from "
1756                        "unknown AP (SA=%s BSSID=%s) - "
1757                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1758                        print_mac(mac, mgmt->bssid));
1759                 return;
1760         }
1761
1762         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1763
1764         printk(KERN_DEBUG "%s: RX deauthentication from %s"
1765                " (reason=%d)\n",
1766                dev->name, print_mac(mac, mgmt->sa), reason_code);
1767
1768         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED) {
1769                 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1770         }
1771
1772         if (ifsta->state == IEEE80211_AUTHENTICATE ||
1773             ifsta->state == IEEE80211_ASSOCIATE ||
1774             ifsta->state == IEEE80211_ASSOCIATED) {
1775                 ifsta->state = IEEE80211_AUTHENTICATE;
1776                 mod_timer(&ifsta->timer, jiffies +
1777                                       IEEE80211_RETRY_AUTH_INTERVAL);
1778         }
1779
1780         ieee80211_set_disassoc(dev, ifsta, 1);
1781         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1782 }
1783
1784
1785 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1786                                        struct ieee80211_if_sta *ifsta,
1787                                        struct ieee80211_mgmt *mgmt,
1788                                        size_t len)
1789 {
1790         u16 reason_code;
1791         DECLARE_MAC_BUF(mac);
1792
1793         if (len < 24 + 2) {
1794                 printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1795                        "received from %s - ignored\n",
1796                        dev->name, len, print_mac(mac, mgmt->sa));
1797                 return;
1798         }
1799
1800         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1801                 printk(KERN_DEBUG "%s: disassociation frame received from "
1802                        "unknown AP (SA=%s BSSID=%s) - "
1803                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1804                        print_mac(mac, mgmt->bssid));
1805                 return;
1806         }
1807
1808         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1809
1810         printk(KERN_DEBUG "%s: RX disassociation from %s"
1811                " (reason=%d)\n",
1812                dev->name, print_mac(mac, mgmt->sa), reason_code);
1813
1814         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1815                 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1816
1817         if (ifsta->state == IEEE80211_ASSOCIATED) {
1818                 ifsta->state = IEEE80211_ASSOCIATE;
1819                 mod_timer(&ifsta->timer, jiffies +
1820                                       IEEE80211_RETRY_AUTH_INTERVAL);
1821         }
1822
1823         ieee80211_set_disassoc(dev, ifsta, 0);
1824 }
1825
1826
1827 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1828                                          struct ieee80211_if_sta *ifsta,
1829                                          struct ieee80211_mgmt *mgmt,
1830                                          size_t len,
1831                                          int reassoc)
1832 {
1833         struct ieee80211_local *local = sdata->local;
1834         struct net_device *dev = sdata->dev;
1835         struct ieee80211_supported_band *sband;
1836         struct sta_info *sta;
1837         u64 rates, basic_rates;
1838         u16 capab_info, status_code, aid;
1839         struct ieee802_11_elems elems;
1840         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1841         u8 *pos;
1842         int i, j;
1843         DECLARE_MAC_BUF(mac);
1844         bool have_higher_than_11mbit = false;
1845
1846         /* AssocResp and ReassocResp have identical structure, so process both
1847          * of them in this function. */
1848
1849         if (ifsta->state != IEEE80211_ASSOCIATE) {
1850                 printk(KERN_DEBUG "%s: association frame received from "
1851                        "%s, but not in associate state - ignored\n",
1852                        dev->name, print_mac(mac, mgmt->sa));
1853                 return;
1854         }
1855
1856         if (len < 24 + 6) {
1857                 printk(KERN_DEBUG "%s: too short (%zd) association frame "
1858                        "received from %s - ignored\n",
1859                        dev->name, len, print_mac(mac, mgmt->sa));
1860                 return;
1861         }
1862
1863         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1864                 printk(KERN_DEBUG "%s: association frame received from "
1865                        "unknown AP (SA=%s BSSID=%s) - "
1866                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1867                        print_mac(mac, mgmt->bssid));
1868                 return;
1869         }
1870
1871         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1872         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1873         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1874
1875         printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1876                "status=%d aid=%d)\n",
1877                dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1878                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1879
1880         if (status_code != WLAN_STATUS_SUCCESS) {
1881                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1882                        dev->name, status_code);
1883                 /* if this was a reassociation, ensure we try a "full"
1884                  * association next time. This works around some broken APs
1885                  * which do not correctly reject reassociation requests. */
1886                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1887                 return;
1888         }
1889
1890         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1891                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1892                        "set\n", dev->name, aid);
1893         aid &= ~(BIT(15) | BIT(14));
1894
1895         pos = mgmt->u.assoc_resp.variable;
1896         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1897
1898         if (!elems.supp_rates) {
1899                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1900                        dev->name);
1901                 return;
1902         }
1903
1904         printk(KERN_DEBUG "%s: associated\n", dev->name);
1905         ifsta->aid = aid;
1906         ifsta->ap_capab = capab_info;
1907
1908         kfree(ifsta->assocresp_ies);
1909         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1910         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1911         if (ifsta->assocresp_ies)
1912                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1913
1914         rcu_read_lock();
1915
1916         /* Add STA entry for the AP */
1917         sta = sta_info_get(local, ifsta->bssid);
1918         if (!sta) {
1919                 struct ieee80211_sta_bss *bss;
1920                 int err;
1921
1922                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
1923                 if (!sta) {
1924                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1925                                " the AP\n", dev->name);
1926                         rcu_read_unlock();
1927                         return;
1928                 }
1929                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
1930                                            local->hw.conf.channel->center_freq,
1931                                            ifsta->ssid, ifsta->ssid_len);
1932                 if (bss) {
1933                         sta->last_rssi = bss->rssi;
1934                         sta->last_signal = bss->signal;
1935                         sta->last_noise = bss->noise;
1936                         ieee80211_rx_bss_put(dev, bss);
1937                 }
1938
1939                 err = sta_info_insert(sta);
1940                 if (err) {
1941                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1942                                " the AP (error %d)\n", dev->name, err);
1943                         rcu_read_unlock();
1944                         return;
1945                 }
1946         }
1947
1948         /*
1949          * FIXME: Do we really need to update the sta_info's information here?
1950          *        We already know about the AP (we found it in our list) so it
1951          *        should already be filled with the right info, no?
1952          *        As is stands, all this is racy because typically we assume
1953          *        the information that is filled in here (except flags) doesn't
1954          *        change while a STA structure is alive. As such, it should move
1955          *        to between the sta_info_alloc() and sta_info_insert() above.
1956          */
1957
1958         sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1959                       WLAN_STA_AUTHORIZED;
1960
1961         rates = 0;
1962         basic_rates = 0;
1963         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1964
1965         for (i = 0; i < elems.supp_rates_len; i++) {
1966                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1967
1968                 if (rate > 110)
1969                         have_higher_than_11mbit = true;
1970
1971                 for (j = 0; j < sband->n_bitrates; j++) {
1972                         if (sband->bitrates[j].bitrate == rate)
1973                                 rates |= BIT(j);
1974                         if (elems.supp_rates[i] & 0x80)
1975                                 basic_rates |= BIT(j);
1976                 }
1977         }
1978
1979         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1980                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1981
1982                 if (rate > 110)
1983                         have_higher_than_11mbit = true;
1984
1985                 for (j = 0; j < sband->n_bitrates; j++) {
1986                         if (sband->bitrates[j].bitrate == rate)
1987                                 rates |= BIT(j);
1988                         if (elems.ext_supp_rates[i] & 0x80)
1989                                 basic_rates |= BIT(j);
1990                 }
1991         }
1992
1993         sta->supp_rates[local->hw.conf.channel->band] = rates;
1994         sdata->basic_rates = basic_rates;
1995
1996         /* cf. IEEE 802.11 9.2.12 */
1997         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1998             have_higher_than_11mbit)
1999                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2000         else
2001                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2002
2003         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2004             local->ops->conf_ht) {
2005                 struct ieee80211_ht_bss_info bss_info;
2006
2007                 ieee80211_ht_cap_ie_to_ht_info(
2008                                 (struct ieee80211_ht_cap *)
2009                                 elems.ht_cap_elem, &sta->ht_info);
2010                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2011                                 (struct ieee80211_ht_addt_info *)
2012                                 elems.ht_info_elem, &bss_info);
2013                 ieee80211_hw_config_ht(local, 1, &sta->ht_info, &bss_info);
2014         }
2015
2016         rate_control_rate_init(sta, local);
2017
2018         if (elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2019                 sta->flags |= WLAN_STA_WME;
2020                 rcu_read_unlock();
2021                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
2022                                          elems.wmm_param_len);
2023         } else
2024                 rcu_read_unlock();
2025
2026         /* set AID, ieee80211_set_associated() will tell the driver */
2027         bss_conf->aid = aid;
2028         ieee80211_set_associated(dev, ifsta, 1);
2029
2030         ieee80211_associated(dev, ifsta);
2031 }
2032
2033
2034 /* Caller must hold local->sta_bss_lock */
2035 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
2036                                         struct ieee80211_sta_bss *bss)
2037 {
2038         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2039         u8 hash_idx;
2040
2041         if (bss_mesh_cfg(bss))
2042                 hash_idx = mesh_id_hash(bss_mesh_id(bss),
2043                                         bss_mesh_id_len(bss));
2044         else
2045                 hash_idx = STA_HASH(bss->bssid);
2046
2047         bss->hnext = local->sta_bss_hash[hash_idx];
2048         local->sta_bss_hash[hash_idx] = bss;
2049 }
2050
2051
2052 /* Caller must hold local->sta_bss_lock */
2053 static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
2054                                         struct ieee80211_sta_bss *bss)
2055 {
2056         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2057         struct ieee80211_sta_bss *b, *prev = NULL;
2058         b = local->sta_bss_hash[STA_HASH(bss->bssid)];
2059         while (b) {
2060                 if (b == bss) {
2061                         if (!prev)
2062                                 local->sta_bss_hash[STA_HASH(bss->bssid)] =
2063                                         bss->hnext;
2064                         else
2065                                 prev->hnext = bss->hnext;
2066                         break;
2067                 }
2068                 prev = b;
2069                 b = b->hnext;
2070         }
2071 }
2072
2073
2074 static struct ieee80211_sta_bss *
2075 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int freq,
2076                      u8 *ssid, u8 ssid_len)
2077 {
2078         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2079         struct ieee80211_sta_bss *bss;
2080
2081         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2082         if (!bss)
2083                 return NULL;
2084         atomic_inc(&bss->users);
2085         atomic_inc(&bss->users);
2086         memcpy(bss->bssid, bssid, ETH_ALEN);
2087         bss->freq = freq;
2088         if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
2089                 memcpy(bss->ssid, ssid, ssid_len);
2090                 bss->ssid_len = ssid_len;
2091         }
2092
2093         spin_lock_bh(&local->sta_bss_lock);
2094         /* TODO: order by RSSI? */
2095         list_add_tail(&bss->list, &local->sta_bss_list);
2096         __ieee80211_rx_bss_hash_add(dev, bss);
2097         spin_unlock_bh(&local->sta_bss_lock);
2098         return bss;
2099 }
2100
2101 static struct ieee80211_sta_bss *
2102 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int freq,
2103                      u8 *ssid, u8 ssid_len)
2104 {
2105         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2106         struct ieee80211_sta_bss *bss;
2107
2108         spin_lock_bh(&local->sta_bss_lock);
2109         bss = local->sta_bss_hash[STA_HASH(bssid)];
2110         while (bss) {
2111                 if (!bss_mesh_cfg(bss) &&
2112                     !memcmp(bss->bssid, bssid, ETH_ALEN) &&
2113                     bss->freq == freq &&
2114                     bss->ssid_len == ssid_len &&
2115                     (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
2116                         atomic_inc(&bss->users);
2117                         break;
2118                 }
2119                 bss = bss->hnext;
2120         }
2121         spin_unlock_bh(&local->sta_bss_lock);
2122         return bss;
2123 }
2124
2125 #ifdef CONFIG_MAC80211_MESH
2126 static struct ieee80211_sta_bss *
2127 ieee80211_rx_mesh_bss_get(struct net_device *dev, u8 *mesh_id, int mesh_id_len,
2128                           u8 *mesh_cfg, int freq)
2129 {
2130         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2131         struct ieee80211_sta_bss *bss;
2132
2133         spin_lock_bh(&local->sta_bss_lock);
2134         bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
2135         while (bss) {
2136                 if (bss_mesh_cfg(bss) &&
2137                     !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
2138                     bss->freq == freq &&
2139                     mesh_id_len == bss->mesh_id_len &&
2140                     (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
2141                                                  mesh_id_len))) {
2142                         atomic_inc(&bss->users);
2143                         break;
2144                 }
2145                 bss = bss->hnext;
2146         }
2147         spin_unlock_bh(&local->sta_bss_lock);
2148         return bss;
2149 }
2150
2151 static struct ieee80211_sta_bss *
2152 ieee80211_rx_mesh_bss_add(struct net_device *dev, u8 *mesh_id, int mesh_id_len,
2153                           u8 *mesh_cfg, int freq)
2154 {
2155         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2156         struct ieee80211_sta_bss *bss;
2157
2158         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
2159         if (!bss)
2160                 return NULL;
2161
2162         bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
2163         if (!bss->mesh_cfg) {
2164                 kfree(bss);
2165                 return NULL;
2166         }
2167
2168         if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
2169                 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
2170                 if (!bss->mesh_id) {
2171                         kfree(bss->mesh_cfg);
2172                         kfree(bss);
2173                         return NULL;
2174                 }
2175                 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
2176         }
2177
2178         atomic_inc(&bss->users);
2179         atomic_inc(&bss->users);
2180         memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
2181         bss->mesh_id_len = mesh_id_len;
2182         bss->freq = freq;
2183         spin_lock_bh(&local->sta_bss_lock);
2184         /* TODO: order by RSSI? */
2185         list_add_tail(&bss->list, &local->sta_bss_list);
2186         __ieee80211_rx_bss_hash_add(dev, bss);
2187         spin_unlock_bh(&local->sta_bss_lock);
2188         return bss;
2189 }
2190 #endif
2191
2192 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
2193 {
2194         kfree(bss->wpa_ie);
2195         kfree(bss->rsn_ie);
2196         kfree(bss->wmm_ie);
2197         kfree(bss->ht_ie);
2198         kfree(bss_mesh_id(bss));
2199         kfree(bss_mesh_cfg(bss));
2200         kfree(bss);
2201 }
2202
2203
2204 static void ieee80211_rx_bss_put(struct net_device *dev,
2205                                  struct ieee80211_sta_bss *bss)
2206 {
2207         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2208         if (!atomic_dec_and_test(&bss->users))
2209                 return;
2210
2211         spin_lock_bh(&local->sta_bss_lock);
2212         __ieee80211_rx_bss_hash_del(dev, bss);
2213         list_del(&bss->list);
2214         spin_unlock_bh(&local->sta_bss_lock);
2215         ieee80211_rx_bss_free(bss);
2216 }
2217
2218
2219 void ieee80211_rx_bss_list_init(struct net_device *dev)
2220 {
2221         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2222         spin_lock_init(&local->sta_bss_lock);
2223         INIT_LIST_HEAD(&local->sta_bss_list);
2224 }
2225
2226
2227 void ieee80211_rx_bss_list_deinit(struct net_device *dev)
2228 {
2229         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2230         struct ieee80211_sta_bss *bss, *tmp;
2231
2232         list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
2233                 ieee80211_rx_bss_put(dev, bss);
2234 }
2235
2236
2237 static int ieee80211_sta_join_ibss(struct net_device *dev,
2238                                    struct ieee80211_if_sta *ifsta,
2239                                    struct ieee80211_sta_bss *bss)
2240 {
2241         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2242         int res, rates, i, j;
2243         struct sk_buff *skb;
2244         struct ieee80211_mgmt *mgmt;
2245         struct ieee80211_tx_control control;
2246         struct rate_selection ratesel;
2247         u8 *pos;
2248         struct ieee80211_sub_if_data *sdata;
2249         struct ieee80211_supported_band *sband;
2250
2251         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2252
2253         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2254
2255         /* Remove possible STA entries from other IBSS networks. */
2256         sta_info_flush_delayed(sdata);
2257
2258         if (local->ops->reset_tsf) {
2259                 /* Reset own TSF to allow time synchronization work. */
2260                 local->ops->reset_tsf(local_to_hw(local));
2261         }
2262         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2263         res = ieee80211_if_config(dev);
2264         if (res)
2265                 return res;
2266
2267         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2268
2269         sdata->drop_unencrypted = bss->capability &
2270                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2271
2272         res = ieee80211_set_freq(local, bss->freq);
2273
2274         if (local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS) {
2275                 printk(KERN_DEBUG "%s: IBSS not allowed on frequency "
2276                        "%d MHz\n", dev->name, local->oper_channel->center_freq);
2277                 return -1;
2278         }
2279
2280         /* Set beacon template */
2281         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2282         do {
2283                 if (!skb)
2284                         break;
2285
2286                 skb_reserve(skb, local->hw.extra_tx_headroom);
2287
2288                 mgmt = (struct ieee80211_mgmt *)
2289                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2290                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2291                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2292                                                    IEEE80211_STYPE_BEACON);
2293                 memset(mgmt->da, 0xff, ETH_ALEN);
2294                 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2295                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2296                 mgmt->u.beacon.beacon_int =
2297                         cpu_to_le16(local->hw.conf.beacon_int);
2298                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2299
2300                 pos = skb_put(skb, 2 + ifsta->ssid_len);
2301                 *pos++ = WLAN_EID_SSID;
2302                 *pos++ = ifsta->ssid_len;
2303                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2304
2305                 rates = bss->supp_rates_len;
2306                 if (rates > 8)
2307                         rates = 8;
2308                 pos = skb_put(skb, 2 + rates);
2309                 *pos++ = WLAN_EID_SUPP_RATES;
2310                 *pos++ = rates;
2311                 memcpy(pos, bss->supp_rates, rates);
2312
2313                 if (bss->band == IEEE80211_BAND_2GHZ) {
2314                         pos = skb_put(skb, 2 + 1);
2315                         *pos++ = WLAN_EID_DS_PARAMS;
2316                         *pos++ = 1;
2317                         *pos++ = ieee80211_frequency_to_channel(bss->freq);
2318                 }
2319
2320                 pos = skb_put(skb, 2 + 2);
2321                 *pos++ = WLAN_EID_IBSS_PARAMS;
2322                 *pos++ = 2;
2323                 /* FIX: set ATIM window based on scan results */
2324                 *pos++ = 0;
2325                 *pos++ = 0;
2326
2327                 if (bss->supp_rates_len > 8) {
2328                         rates = bss->supp_rates_len - 8;
2329                         pos = skb_put(skb, 2 + rates);
2330                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
2331                         *pos++ = rates;
2332                         memcpy(pos, &bss->supp_rates[8], rates);
2333                 }
2334
2335                 memset(&control, 0, sizeof(control));
2336                 rate_control_get_rate(dev, sband, skb, &ratesel);
2337                 if (!ratesel.rate) {
2338                         printk(KERN_DEBUG "%s: Failed to determine TX rate "
2339                                "for IBSS beacon\n", dev->name);
2340                         break;
2341                 }
2342                 control.vif = &sdata->vif;
2343                 control.tx_rate = ratesel.rate;
2344                 if (sdata->bss_conf.use_short_preamble &&
2345                     ratesel.rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
2346                         control.flags |= IEEE80211_TXCTL_SHORT_PREAMBLE;
2347                 control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2348                 control.flags |= IEEE80211_TXCTL_NO_ACK;
2349                 control.retry_limit = 1;
2350
2351                 ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
2352                 if (ifsta->probe_resp) {
2353                         mgmt = (struct ieee80211_mgmt *)
2354                                 ifsta->probe_resp->data;
2355                         mgmt->frame_control =
2356                                 IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2357                                              IEEE80211_STYPE_PROBE_RESP);
2358                 } else {
2359                         printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
2360                                "template for IBSS\n", dev->name);
2361                 }
2362
2363                 if (local->ops->beacon_update &&
2364                     local->ops->beacon_update(local_to_hw(local),
2365                                              skb, &control) == 0) {
2366                         printk(KERN_DEBUG "%s: Configured IBSS beacon "
2367                                "template\n", dev->name);
2368                         skb = NULL;
2369                 }
2370
2371                 rates = 0;
2372                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2373                 for (i = 0; i < bss->supp_rates_len; i++) {
2374                         int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2375                         for (j = 0; j < sband->n_bitrates; j++)
2376                                 if (sband->bitrates[j].bitrate == bitrate)
2377                                         rates |= BIT(j);
2378                 }
2379                 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
2380
2381                 ieee80211_sta_def_wmm_params(dev, bss, 1);
2382         } while (0);
2383
2384         if (skb) {
2385                 printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
2386                        "template\n", dev->name);
2387                 dev_kfree_skb(skb);
2388         }
2389
2390         ifsta->state = IEEE80211_IBSS_JOINED;
2391         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2392
2393         ieee80211_rx_bss_put(dev, bss);
2394
2395         return res;
2396 }
2397
2398 u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
2399                             struct ieee802_11_elems *elems,
2400                             enum ieee80211_band band)
2401 {
2402         struct ieee80211_supported_band *sband;
2403         struct ieee80211_rate *bitrates;
2404         size_t num_rates;
2405         u64 supp_rates;
2406         int i, j;
2407         sband = local->hw.wiphy->bands[band];
2408
2409         if (!sband) {
2410                 WARN_ON(1);
2411                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2412         }
2413
2414         bitrates = sband->bitrates;
2415         num_rates = sband->n_bitrates;
2416         supp_rates = 0;
2417         for (i = 0; i < elems->supp_rates_len +
2418                      elems->ext_supp_rates_len; i++) {
2419                 u8 rate = 0;
2420                 int own_rate;
2421                 if (i < elems->supp_rates_len)
2422                         rate = elems->supp_rates[i];
2423                 else if (elems->ext_supp_rates)
2424                         rate = elems->ext_supp_rates
2425                                 [i - elems->supp_rates_len];
2426                 own_rate = 5 * (rate & 0x7f);
2427                 for (j = 0; j < num_rates; j++)
2428                         if (bitrates[j].bitrate == own_rate)
2429                                 supp_rates |= BIT(j);
2430         }
2431         return supp_rates;
2432 }
2433
2434
2435 static void ieee80211_rx_bss_info(struct net_device *dev,
2436                                   struct ieee80211_mgmt *mgmt,
2437                                   size_t len,
2438                                   struct ieee80211_rx_status *rx_status,
2439                                   int beacon)
2440 {
2441         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2442         struct ieee802_11_elems elems;
2443         size_t baselen;
2444         int freq, clen;
2445         struct ieee80211_sta_bss *bss;
2446         struct sta_info *sta;
2447         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2448         u64 beacon_timestamp, rx_timestamp;
2449         struct ieee80211_channel *channel;
2450         DECLARE_MAC_BUF(mac);
2451         DECLARE_MAC_BUF(mac2);
2452
2453         if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
2454                 return; /* ignore ProbeResp to foreign address */
2455
2456 #if 0
2457         printk(KERN_DEBUG "%s: RX %s from %s to %s\n",
2458                dev->name, beacon ? "Beacon" : "Probe Response",
2459                print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da));
2460 #endif
2461
2462         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2463         if (baselen > len)
2464                 return;
2465
2466         beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
2467         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2468
2469         if (ieee80211_vif_is_mesh(&sdata->vif) && elems.mesh_id &&
2470             elems.mesh_config && mesh_matches_local(&elems, dev)) {
2471                 u64 rates = ieee80211_sta_get_rates(local, &elems,
2472                                                 rx_status->band);
2473
2474                 mesh_neighbour_update(mgmt->sa, rates, dev,
2475                                       mesh_peer_accepts_plinks(&elems, dev));
2476         }
2477
2478         rcu_read_lock();
2479
2480         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
2481             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
2482             (sta = sta_info_get(local, mgmt->sa))) {
2483                 u64 prev_rates;
2484                 u64 supp_rates = ieee80211_sta_get_rates(local, &elems,
2485                                                         rx_status->band);
2486
2487                 prev_rates = sta->supp_rates[rx_status->band];
2488                 sta->supp_rates[rx_status->band] &= supp_rates;
2489                 if (sta->supp_rates[rx_status->band] == 0) {
2490                         /* No matching rates - this should not really happen.
2491                          * Make sure that at least one rate is marked
2492                          * supported to avoid issues with TX rate ctrl. */
2493                         sta->supp_rates[rx_status->band] =
2494                                 sdata->u.sta.supp_rates_bits[rx_status->band];
2495                 }
2496                 if (sta->supp_rates[rx_status->band] != prev_rates) {
2497                         printk(KERN_DEBUG "%s: updated supp_rates set for "
2498                                "%s based on beacon info (0x%llx & 0x%llx -> "
2499                                "0x%llx)\n",
2500                                dev->name, print_mac(mac, sta->addr),
2501                                (unsigned long long) prev_rates,
2502                                (unsigned long long) supp_rates,
2503                                (unsigned long long) sta->supp_rates[rx_status->band]);
2504                 }
2505         }
2506
2507         rcu_read_unlock();
2508
2509         if (elems.ds_params && elems.ds_params_len == 1)
2510                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
2511         else
2512                 freq = rx_status->freq;
2513
2514         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2515
2516         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2517                 return;
2518
2519 #ifdef CONFIG_MAC80211_MESH
2520         if (elems.mesh_config)
2521                 bss = ieee80211_rx_mesh_bss_get(dev, elems.mesh_id,
2522                                 elems.mesh_id_len, elems.mesh_config, freq);
2523         else
2524 #endif
2525                 bss = ieee80211_rx_bss_get(dev, mgmt->bssid, freq,
2526                                            elems.ssid, elems.ssid_len);
2527         if (!bss) {
2528 #ifdef CONFIG_MAC80211_MESH
2529                 if (elems.mesh_config)
2530                         bss = ieee80211_rx_mesh_bss_add(dev, elems.mesh_id,
2531                                 elems.mesh_id_len, elems.mesh_config, freq);
2532                 else
2533 #endif
2534                         bss = ieee80211_rx_bss_add(dev, mgmt->bssid, freq,
2535                                                    elems.ssid, elems.ssid_len);
2536                 if (!bss)
2537                         return;
2538         } else {
2539 #if 0
2540                 /* TODO: order by RSSI? */
2541                 spin_lock_bh(&local->sta_bss_lock);
2542                 list_move_tail(&bss->list, &local->sta_bss_list);
2543                 spin_unlock_bh(&local->sta_bss_lock);
2544 #endif
2545         }
2546
2547         bss->band = rx_status->band;
2548
2549         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
2550             bss->probe_resp && beacon) {
2551                 /* STA mode:
2552                  * Do not allow beacon to override data from Probe Response. */
2553                 ieee80211_rx_bss_put(dev, bss);
2554                 return;
2555         }
2556
2557         /* save the ERP value so that it is available at association time */
2558         if (elems.erp_info && elems.erp_info_len >= 1) {
2559                 bss->erp_value = elems.erp_info[0];
2560                 bss->has_erp_value = 1;
2561         }
2562
2563         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
2564         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
2565
2566         bss->supp_rates_len = 0;
2567         if (elems.supp_rates) {
2568                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2569                 if (clen > elems.supp_rates_len)
2570                         clen = elems.supp_rates_len;
2571                 memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
2572                        clen);
2573                 bss->supp_rates_len += clen;
2574         }
2575         if (elems.ext_supp_rates) {
2576                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
2577                 if (clen > elems.ext_supp_rates_len)
2578                         clen = elems.ext_supp_rates_len;
2579                 memcpy(&bss->supp_rates[bss->supp_rates_len],
2580                        elems.ext_supp_rates, clen);
2581                 bss->supp_rates_len += clen;
2582         }
2583
2584         if (elems.wpa &&
2585             (!bss->wpa_ie || bss->wpa_ie_len != elems.wpa_len ||
2586              memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
2587                 kfree(bss->wpa_ie);
2588                 bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
2589                 if (bss->wpa_ie) {
2590                         memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
2591                         bss->wpa_ie_len = elems.wpa_len + 2;
2592                 } else
2593                         bss->wpa_ie_len = 0;
2594         } else if (!elems.wpa && bss->wpa_ie) {
2595                 kfree(bss->wpa_ie);
2596                 bss->wpa_ie = NULL;
2597                 bss->wpa_ie_len = 0;
2598         }
2599
2600         if (elems.rsn &&
2601             (!bss->rsn_ie || bss->rsn_ie_len != elems.rsn_len ||
2602              memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
2603                 kfree(bss->rsn_ie);
2604                 bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
2605                 if (bss->rsn_ie) {
2606                         memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
2607                         bss->rsn_ie_len = elems.rsn_len + 2;
2608                 } else
2609                         bss->rsn_ie_len = 0;
2610         } else if (!elems.rsn && bss->rsn_ie) {
2611                 kfree(bss->rsn_ie);
2612                 bss->rsn_ie = NULL;
2613                 bss->rsn_ie_len = 0;
2614         }
2615
2616         if (elems.wmm_param &&
2617             (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_param_len ||
2618              memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
2619                 kfree(bss->wmm_ie);
2620                 bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
2621                 if (bss->wmm_ie) {
2622                         memcpy(bss->wmm_ie, elems.wmm_param - 2,
2623                                elems.wmm_param_len + 2);
2624                         bss->wmm_ie_len = elems.wmm_param_len + 2;
2625                 } else
2626                         bss->wmm_ie_len = 0;
2627         } else if (!elems.wmm_param && bss->wmm_ie) {
2628                 kfree(bss->wmm_ie);
2629                 bss->wmm_ie = NULL;
2630                 bss->wmm_ie_len = 0;
2631         }
2632         if (elems.ht_cap_elem &&
2633             (!bss->ht_ie || bss->ht_ie_len != elems.ht_cap_elem_len ||
2634              memcmp(bss->ht_ie, elems.ht_cap_elem, elems.ht_cap_elem_len))) {
2635                 kfree(bss->ht_ie);
2636                 bss->ht_ie = kmalloc(elems.ht_cap_elem_len + 2, GFP_ATOMIC);
2637                 if (bss->ht_ie) {
2638                         memcpy(bss->ht_ie, elems.ht_cap_elem - 2,
2639                                elems.ht_cap_elem_len + 2);
2640                         bss->ht_ie_len = elems.ht_cap_elem_len + 2;
2641                 } else
2642                         bss->ht_ie_len = 0;
2643         } else if (!elems.ht_cap_elem && bss->ht_ie) {
2644                 kfree(bss->ht_ie);
2645                 bss->ht_ie = NULL;
2646                 bss->ht_ie_len = 0;
2647         }
2648
2649         bss->timestamp = beacon_timestamp;
2650         bss->last_update = jiffies;
2651         bss->rssi = rx_status->ssi;
2652         bss->signal = rx_status->signal;
2653         bss->noise = rx_status->noise;
2654         if (!beacon)
2655                 bss->probe_resp++;
2656
2657         /* check if we need to merge IBSS */
2658         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
2659             !local->sta_sw_scanning && !local->sta_hw_scanning &&
2660             bss->capability & WLAN_CAPABILITY_IBSS &&
2661             bss->freq == local->oper_channel->center_freq &&
2662             elems.ssid_len == sdata->u.sta.ssid_len &&
2663             memcmp(elems.ssid, sdata->u.sta.ssid, sdata->u.sta.ssid_len) == 0) {
2664                 if (rx_status->flag & RX_FLAG_TSFT) {
2665                         /* in order for correct IBSS merging we need mactime
2666                          *
2667                          * since mactime is defined as the time the first data
2668                          * symbol of the frame hits the PHY, and the timestamp
2669                          * of the beacon is defined as "the time that the data
2670                          * symbol containing the first bit of the timestamp is
2671                          * transmitted to the PHY plus the transmitting STA’s
2672                          * delays through its local PHY from the MAC-PHY
2673                          * interface to its interface with the WM"
2674                          * (802.11 11.1.2) - equals the time this bit arrives at
2675                          * the receiver - we have to take into account the
2676                          * offset between the two.
2677                          * e.g: at 1 MBit that means mactime is 192 usec earlier
2678                          * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
2679                          */
2680                         int rate = local->hw.wiphy->bands[rx_status->band]->
2681                                         bitrates[rx_status->rate_idx].bitrate;
2682                         rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
2683                 } else if (local && local->ops && local->ops->get_tsf)
2684                         /* second best option: get current TSF */
2685                         rx_timestamp = local->ops->get_tsf(local_to_hw(local));
2686                 else
2687                         /* can't merge without knowing the TSF */
2688                         rx_timestamp = -1LLU;
2689 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2690                 printk(KERN_DEBUG "RX beacon SA=%s BSSID="
2691                        "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
2692                        print_mac(mac, mgmt->sa),
2693                        print_mac(mac2, mgmt->bssid),
2694                        (unsigned long long)rx_timestamp,
2695                        (unsigned long long)beacon_timestamp,
2696                        (unsigned long long)(rx_timestamp - beacon_timestamp),
2697                        jiffies);
2698 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2699                 if (beacon_timestamp > rx_timestamp) {
2700 #ifndef CONFIG_MAC80211_IBSS_DEBUG
2701                         if (net_ratelimit())
2702 #endif
2703                                 printk(KERN_DEBUG "%s: beacon TSF higher than "
2704                                        "local TSF - IBSS merge with BSSID %s\n",
2705                                        dev->name, print_mac(mac, mgmt->bssid));
2706                         ieee80211_sta_join_ibss(dev, &sdata->u.sta, bss);
2707                         ieee80211_ibss_add_sta(dev, NULL,
2708                                                mgmt->bssid, mgmt->sa);
2709                 }
2710         }
2711
2712         ieee80211_rx_bss_put(dev, bss);
2713 }
2714
2715
2716 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
2717                                          struct ieee80211_mgmt *mgmt,
2718                                          size_t len,
2719                                          struct ieee80211_rx_status *rx_status)
2720 {
2721         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
2722 }
2723
2724
2725 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
2726                                      struct ieee80211_mgmt *mgmt,
2727                                      size_t len,
2728                                      struct ieee80211_rx_status *rx_status)
2729 {
2730         struct ieee80211_sub_if_data *sdata;
2731         struct ieee80211_if_sta *ifsta;
2732         size_t baselen;
2733         struct ieee802_11_elems elems;
2734         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2735         struct ieee80211_conf *conf = &local->hw.conf;
2736         u32 changed = 0;
2737
2738         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
2739
2740         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2741         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2742                 return;
2743         ifsta = &sdata->u.sta;
2744
2745         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2746             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2747                 return;
2748
2749         /* Process beacon from the current BSS */
2750         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2751         if (baselen > len)
2752                 return;
2753
2754         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2755
2756         if (elems.erp_info && elems.erp_info_len >= 1)
2757                 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2758
2759         if (elems.ht_cap_elem && elems.ht_info_elem &&
2760             elems.wmm_param && local->ops->conf_ht &&
2761             conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2762                 struct ieee80211_ht_bss_info bss_info;
2763
2764                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2765                                 (struct ieee80211_ht_addt_info *)
2766                                 elems.ht_info_elem, &bss_info);
2767                 /* check if AP changed bss inforamation */
2768                 if ((conf->ht_bss_conf.primary_channel !=
2769                      bss_info.primary_channel) ||
2770                     (conf->ht_bss_conf.bss_cap != bss_info.bss_cap) ||
2771                     (conf->ht_bss_conf.bss_op_mode != bss_info.bss_op_mode))
2772                         ieee80211_hw_config_ht(local, 1, &conf->ht_conf,
2773                                                 &bss_info);
2774         }
2775
2776         if (elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2777                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
2778                                          elems.wmm_param_len);
2779         }
2780
2781         ieee80211_bss_info_change_notify(sdata, changed);
2782 }
2783
2784
2785 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
2786                                         struct ieee80211_if_sta *ifsta,
2787                                         struct ieee80211_mgmt *mgmt,
2788                                         size_t len,
2789                                         struct ieee80211_rx_status *rx_status)
2790 {
2791         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2792         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2793         int tx_last_beacon;
2794         struct sk_buff *skb;
2795         struct ieee80211_mgmt *resp;
2796         u8 *pos, *end;
2797         DECLARE_MAC_BUF(mac);
2798 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2799         DECLARE_MAC_BUF(mac2);
2800         DECLARE_MAC_BUF(mac3);
2801 #endif
2802
2803         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2804             ifsta->state != IEEE80211_IBSS_JOINED ||
2805             len < 24 + 2 || !ifsta->probe_resp)
2806                 return;
2807
2808         if (local->ops->tx_last_beacon)
2809                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2810         else
2811                 tx_last_beacon = 1;
2812
2813 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2814         printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2815                "%s (tx_last_beacon=%d)\n",
2816                dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2817                print_mac(mac3, mgmt->bssid), tx_last_beacon);
2818 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2819
2820         if (!tx_last_beacon)
2821                 return;
2822
2823         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2824             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2825                 return;
2826
2827         end = ((u8 *) mgmt) + len;
2828         pos = mgmt->u.probe_req.variable;
2829         if (pos[0] != WLAN_EID_SSID ||
2830             pos + 2 + pos[1] > end) {
2831                 if (net_ratelimit()) {
2832                         printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2833                                "from %s\n",
2834                                dev->name, print_mac(mac, mgmt->sa));
2835                 }
2836                 return;
2837         }
2838         if (pos[1] != 0 &&
2839             (pos[1] != ifsta->ssid_len ||
2840              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2841                 /* Ignore ProbeReq for foreign SSID */
2842                 return;
2843         }
2844
2845         /* Reply with ProbeResp */
2846         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2847         if (!skb)
2848                 return;
2849
2850         resp = (struct ieee80211_mgmt *) skb->data;
2851         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2852 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2853         printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
2854                dev->name, print_mac(mac, resp->da));
2855 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2856         ieee80211_sta_tx(dev, skb, 0);
2857 }
2858
2859 static void ieee80211_rx_mgmt_action(struct net_device *dev,
2860                                      struct ieee80211_if_sta *ifsta,
2861                                      struct ieee80211_mgmt *mgmt,
2862                                      size_t len,
2863                                      struct ieee80211_rx_status *rx_status)
2864 {
2865         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2866
2867         if (len < IEEE80211_MIN_ACTION_SIZE)
2868                 return;
2869
2870         switch (mgmt->u.action.category) {
2871         case WLAN_CATEGORY_BACK:
2872                 switch (mgmt->u.action.u.addba_req.action_code) {
2873                 case WLAN_ACTION_ADDBA_REQ:
2874                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2875                                    sizeof(mgmt->u.action.u.addba_req)))
2876                                 break;
2877                         ieee80211_sta_process_addba_request(dev, mgmt, len);
2878                         break;
2879                 case WLAN_ACTION_ADDBA_RESP:
2880                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2881                                    sizeof(mgmt->u.action.u.addba_resp)))
2882                                 break;
2883                         ieee80211_sta_process_addba_resp(dev, mgmt, len);
2884                         break;
2885                 case WLAN_ACTION_DELBA:
2886                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2887                                    sizeof(mgmt->u.action.u.delba)))
2888                                 break;
2889                         ieee80211_sta_process_delba(dev, mgmt, len);
2890                         break;
2891                 default:
2892                         if (net_ratelimit())
2893                            printk(KERN_DEBUG "%s: Rx unknown A-MPDU action\n",
2894                                         dev->name);
2895                         break;
2896                 }
2897                 break;
2898         case PLINK_CATEGORY:
2899                 if (ieee80211_vif_is_mesh(&sdata->vif))
2900                         mesh_rx_plink_frame(dev, mgmt, len, rx_status);
2901                 break;
2902         case MESH_PATH_SEL_CATEGORY:
2903                 if (ieee80211_vif_is_mesh(&sdata->vif))
2904                         mesh_rx_path_sel_frame(dev, mgmt, len);
2905                 break;
2906         default:
2907                 if (net_ratelimit())
2908                         printk(KERN_DEBUG "%s: Rx unknown action frame - "
2909                         "category=%d\n", dev->name, mgmt->u.action.category);
2910                 break;
2911         }
2912 }
2913
2914 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
2915                            struct ieee80211_rx_status *rx_status)
2916 {
2917         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2918         struct ieee80211_sub_if_data *sdata;
2919         struct ieee80211_if_sta *ifsta;
2920         struct ieee80211_mgmt *mgmt;
2921         u16 fc;
2922
2923         if (skb->len < 24)
2924                 goto fail;
2925
2926         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2927         ifsta = &sdata->u.sta;
2928
2929         mgmt = (struct ieee80211_mgmt *) skb->data;
2930         fc = le16_to_cpu(mgmt->frame_control);
2931
2932         switch (fc & IEEE80211_FCTL_STYPE) {
2933         case IEEE80211_STYPE_PROBE_REQ:
2934         case IEEE80211_STYPE_PROBE_RESP:
2935         case IEEE80211_STYPE_BEACON:
2936         case IEEE80211_STYPE_ACTION:
2937                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2938         case IEEE80211_STYPE_AUTH:
2939         case IEEE80211_STYPE_ASSOC_RESP:
2940         case IEEE80211_STYPE_REASSOC_RESP:
2941         case IEEE80211_STYPE_DEAUTH:
2942         case IEEE80211_STYPE_DISASSOC:
2943                 skb_queue_tail(&ifsta->skb_queue, skb);
2944                 queue_work(local->hw.workqueue, &ifsta->work);
2945                 return;
2946         default:
2947                 printk(KERN_DEBUG "%s: received unknown management frame - "
2948                        "stype=%d\n", dev->name,
2949                        (fc & IEEE80211_FCTL_STYPE) >> 4);
2950                 break;
2951         }
2952
2953  fail:
2954         kfree_skb(skb);
2955 }
2956
2957
2958 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
2959                                          struct sk_buff *skb)
2960 {
2961         struct ieee80211_rx_status *rx_status;
2962         struct ieee80211_sub_if_data *sdata;
2963         struct ieee80211_if_sta *ifsta;
2964         struct ieee80211_mgmt *mgmt;
2965         u16 fc;
2966
2967         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2968         ifsta = &sdata->u.sta;
2969
2970         rx_status = (struct ieee80211_rx_status *) skb->cb;
2971         mgmt = (struct ieee80211_mgmt *) skb->data;
2972         fc = le16_to_cpu(mgmt->frame_control);
2973
2974         switch (fc & IEEE80211_FCTL_STYPE) {
2975         case IEEE80211_STYPE_PROBE_REQ:
2976                 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
2977                                             rx_status);
2978                 break;
2979         case IEEE80211_STYPE_PROBE_RESP:
2980                 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
2981                 break;
2982         case IEEE80211_STYPE_BEACON:
2983                 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
2984                 break;
2985         case IEEE80211_STYPE_AUTH:
2986                 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
2987                 break;
2988         case IEEE80211_STYPE_ASSOC_RESP:
2989                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2990                 break;
2991         case IEEE80211_STYPE_REASSOC_RESP:
2992                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2993                 break;
2994         case IEEE80211_STYPE_DEAUTH:
2995                 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
2996                 break;
2997         case IEEE80211_STYPE_DISASSOC:
2998                 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
2999                 break;
3000         case IEEE80211_STYPE_ACTION:
3001                 ieee80211_rx_mgmt_action(dev, ifsta, mgmt, skb->len, rx_status);
3002                 break;
3003         }
3004
3005         kfree_skb(skb);
3006 }
3007
3008
3009 ieee80211_rx_result
3010 ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
3011                       struct ieee80211_rx_status *rx_status)
3012 {
3013         struct ieee80211_mgmt *mgmt;
3014         u16 fc;
3015
3016         if (skb->len < 2)
3017                 return RX_DROP_UNUSABLE;
3018
3019         mgmt = (struct ieee80211_mgmt *) skb->data;
3020         fc = le16_to_cpu(mgmt->frame_control);
3021
3022         if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL)
3023                 return RX_CONTINUE;
3024
3025         if (skb->len < 24)
3026                 return RX_DROP_MONITOR;
3027
3028         if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
3029                 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
3030                         ieee80211_rx_mgmt_probe_resp(dev, mgmt,
3031                                                      skb->len, rx_status);
3032                         dev_kfree_skb(skb);
3033                         return RX_QUEUED;
3034                 } else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
3035                         ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
3036                                                  rx_status);
3037                         dev_kfree_skb(skb);
3038                         return RX_QUEUED;
3039                 }
3040         }
3041         return RX_CONTINUE;
3042 }
3043
3044
3045 static int ieee80211_sta_active_ibss(struct net_device *dev)
3046 {
3047         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3048         int active = 0;
3049         struct sta_info *sta;
3050         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3051
3052         rcu_read_lock();
3053
3054         list_for_each_entry_rcu(sta, &local->sta_list, list) {
3055                 if (sta->sdata == sdata &&
3056                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
3057                                jiffies)) {
3058                         active++;
3059                         break;
3060                 }
3061         }
3062
3063         rcu_read_unlock();
3064
3065         return active;
3066 }
3067
3068
3069 static void ieee80211_sta_expire(struct net_device *dev, unsigned long exp_time)
3070 {
3071         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3072         struct sta_info *sta, *tmp;
3073         LIST_HEAD(tmp_list);
3074         DECLARE_MAC_BUF(mac);
3075         unsigned long flags;
3076
3077         spin_lock_irqsave(&local->sta_lock, flags);
3078         list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
3079                 if (time_after(jiffies, sta->last_rx + exp_time)) {
3080                         printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
3081                                dev->name, print_mac(mac, sta->addr));
3082                         __sta_info_unlink(&sta);
3083                         if (sta)
3084                                 list_add(&sta->list, &tmp_list);
3085                 }
3086         spin_unlock_irqrestore(&local->sta_lock, flags);
3087
3088         synchronize_rcu();
3089
3090         rtnl_lock();
3091         list_for_each_entry_safe(sta, tmp, &tmp_list, list)
3092                 sta_info_destroy(sta);
3093         rtnl_unlock();
3094 }
3095
3096
3097 static void ieee80211_sta_merge_ibss(struct net_device *dev,
3098                                      struct ieee80211_if_sta *ifsta)
3099 {
3100         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
3101
3102         ieee80211_sta_expire(dev, IEEE80211_IBSS_INACTIVITY_LIMIT);
3103         if (ieee80211_sta_active_ibss(dev))
3104                 return;
3105
3106         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
3107                "IBSS networks with same SSID (merge)\n", dev->name);
3108         ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
3109 }
3110
3111
3112 #ifdef CONFIG_MAC80211_MESH
3113 static void ieee80211_mesh_housekeeping(struct net_device *dev,
3114                            struct ieee80211_if_sta *ifsta)
3115 {
3116         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3117         bool free_plinks;
3118
3119         ieee80211_sta_expire(dev, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
3120         mesh_path_expire(dev);
3121
3122         free_plinks = mesh_plink_availables(sdata);
3123         if (free_plinks != sdata->u.sta.accepting_plinks)
3124                 ieee80211_if_config_beacon(dev);
3125
3126         mod_timer(&ifsta->timer, jiffies +
3127                         IEEE80211_MESH_HOUSEKEEPING_INTERVAL);
3128 }
3129
3130
3131 void ieee80211_start_mesh(struct net_device *dev)
3132 {
3133         struct ieee80211_if_sta *ifsta;
3134         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3135         ifsta = &sdata->u.sta;
3136         ifsta->state = IEEE80211_MESH_UP;
3137         ieee80211_sta_timer((unsigned long)sdata);
3138 }
3139 #endif
3140
3141
3142 void ieee80211_sta_timer(unsigned long data)
3143 {
3144         struct ieee80211_sub_if_data *sdata =
3145                 (struct ieee80211_sub_if_data *) data;
3146         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3147         struct ieee80211_local *local = wdev_priv(&sdata->wdev);
3148
3149         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3150         queue_work(local->hw.workqueue, &ifsta->work);
3151 }
3152
3153 void ieee80211_sta_work(struct work_struct *work)
3154 {
3155         struct ieee80211_sub_if_data *sdata =
3156                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
3157         struct net_device *dev = sdata->dev;
3158         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3159         struct ieee80211_if_sta *ifsta;
3160         struct sk_buff *skb;
3161
3162         if (!netif_running(dev))
3163                 return;
3164
3165         if (local->sta_sw_scanning || local->sta_hw_scanning)
3166                 return;
3167
3168         if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
3169             sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
3170             sdata->vif.type != IEEE80211_IF_TYPE_MESH_POINT) {
3171                 printk(KERN_DEBUG "%s: ieee80211_sta_work: non-STA interface "
3172                        "(type=%d)\n", dev->name, sdata->vif.type);
3173                 return;
3174         }
3175         ifsta = &sdata->u.sta;
3176
3177         while ((skb = skb_dequeue(&ifsta->skb_queue)))
3178                 ieee80211_sta_rx_queued_mgmt(dev, skb);
3179
3180 #ifdef CONFIG_MAC80211_MESH
3181         if (ifsta->preq_queue_len &&
3182             time_after(jiffies,
3183                        ifsta->last_preq + msecs_to_jiffies(ifsta->mshcfg.dot11MeshHWMPpreqMinInterval)))
3184                 mesh_path_start_discovery(dev);
3185 #endif
3186
3187         if (ifsta->state != IEEE80211_AUTHENTICATE &&
3188             ifsta->state != IEEE80211_ASSOCIATE &&
3189             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
3190                 if (ifsta->scan_ssid_len)
3191                         ieee80211_sta_start_scan(dev, ifsta->scan_ssid, ifsta->scan_ssid_len);
3192                 else
3193                         ieee80211_sta_start_scan(dev, NULL, 0);
3194                 return;
3195         }
3196
3197         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
3198                 if (ieee80211_sta_config_auth(dev, ifsta))
3199                         return;
3200                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
3201         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
3202                 return;
3203
3204         switch (ifsta->state) {
3205         case IEEE80211_DISABLED:
3206                 break;
3207         case IEEE80211_AUTHENTICATE:
3208                 ieee80211_authenticate(dev, ifsta);
3209                 break;
3210         case IEEE80211_ASSOCIATE:
3211                 ieee80211_associate(dev, ifsta);
3212                 break;
3213         case IEEE80211_ASSOCIATED:
3214                 ieee80211_associated(dev, ifsta);
3215                 break;
3216         case IEEE80211_IBSS_SEARCH:
3217                 ieee80211_sta_find_ibss(dev, ifsta);
3218                 break;
3219         case IEEE80211_IBSS_JOINED:
3220                 ieee80211_sta_merge_ibss(dev, ifsta);
3221                 break;
3222 #ifdef CONFIG_MAC80211_MESH
3223         case IEEE80211_MESH_UP:
3224                 ieee80211_mesh_housekeeping(dev, ifsta);
3225                 break;
3226 #endif
3227         default:
3228                 printk(KERN_DEBUG "ieee80211_sta_work: Unknown state %d\n",
3229                        ifsta->state);
3230                 break;
3231         }
3232
3233         if (ieee80211_privacy_mismatch(dev, ifsta)) {
3234                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
3235                        "mixed-cell disabled - disassociate\n", dev->name);
3236
3237                 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
3238                 ieee80211_set_disassoc(dev, ifsta, 0);
3239         }
3240 }
3241
3242
3243 static void ieee80211_sta_reset_auth(struct net_device *dev,
3244                                      struct ieee80211_if_sta *ifsta)
3245 {
3246         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3247
3248         if (local->ops->reset_tsf) {
3249                 /* Reset own TSF to allow time synchronization work. */
3250                 local->ops->reset_tsf(local_to_hw(local));
3251         }
3252
3253         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
3254
3255
3256         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
3257                 ifsta->auth_alg = WLAN_AUTH_OPEN;
3258         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
3259                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
3260         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
3261                 ifsta->auth_alg = WLAN_AUTH_LEAP;
3262         else
3263                 ifsta->auth_alg = WLAN_AUTH_OPEN;
3264         printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
3265                ifsta->auth_alg);
3266         ifsta->auth_transaction = -1;
3267         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
3268         ifsta->auth_tries = ifsta->assoc_tries = 0;
3269         netif_carrier_off(dev);
3270 }
3271
3272
3273 void ieee80211_sta_req_auth(struct net_device *dev,
3274                             struct ieee80211_if_sta *ifsta)
3275 {
3276         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3277         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3278
3279         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3280                 return;
3281
3282         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
3283                                 IEEE80211_STA_AUTO_BSSID_SEL)) &&
3284             (ifsta->flags & (IEEE80211_STA_SSID_SET |
3285                                 IEEE80211_STA_AUTO_SSID_SEL))) {
3286                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3287                 queue_work(local->hw.workqueue, &ifsta->work);
3288         }
3289 }
3290
3291 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
3292                                     const char *ssid, int ssid_len)
3293 {
3294         int tmp, hidden_ssid;
3295
3296         if (ssid_len == ifsta->ssid_len &&
3297             !memcmp(ifsta->ssid, ssid, ssid_len))
3298                 return 1;
3299
3300         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
3301                 return 0;
3302
3303         hidden_ssid = 1;
3304         tmp = ssid_len;
3305         while (tmp--) {
3306                 if (ssid[tmp] != '\0') {
3307                         hidden_ssid = 0;
3308                         break;
3309                 }
3310         }
3311
3312         if (hidden_ssid && ifsta->ssid_len == ssid_len)
3313                 return 1;
3314
3315         if (ssid_len == 1 && ssid[0] == ' ')
3316                 return 1;
3317
3318         return 0;
3319 }
3320
3321 static int ieee80211_sta_config_auth(struct net_device *dev,
3322                                      struct ieee80211_if_sta *ifsta)
3323 {
3324         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3325         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3326         struct ieee80211_sta_bss *bss, *selected = NULL;
3327         int top_rssi = 0, freq;
3328
3329         if (!(ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
3330             IEEE80211_STA_AUTO_BSSID_SEL | IEEE80211_STA_AUTO_CHANNEL_SEL))) {
3331                 ifsta->state = IEEE80211_AUTHENTICATE;
3332                 ieee80211_sta_reset_auth(dev, ifsta);
3333                 return 0;
3334         }
3335
3336         spin_lock_bh(&local->sta_bss_lock);
3337         freq = local->oper_channel->center_freq;
3338         list_for_each_entry(bss, &local->sta_bss_list, list) {
3339                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
3340                         continue;
3341
3342                 if (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
3343                     !!sdata->default_key)
3344                         continue;
3345
3346                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
3347                     bss->freq != freq)
3348                         continue;
3349
3350                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
3351                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
3352                         continue;
3353
3354                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
3355                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
3356                         continue;
3357
3358                 if (!selected || top_rssi < bss->rssi) {
3359                         selected = bss;
3360                         top_rssi = bss->rssi;
3361                 }
3362         }
3363         if (selected)
3364                 atomic_inc(&selected->users);
3365         spin_unlock_bh(&local->sta_bss_lock);
3366
3367         if (selected) {
3368                 ieee80211_set_freq(local, selected->freq);
3369                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
3370                         ieee80211_sta_set_ssid(dev, selected->ssid,
3371                                                selected->ssid_len);
3372                 ieee80211_sta_set_bssid(dev, selected->bssid);
3373                 ieee80211_sta_def_wmm_params(dev, selected, 0);
3374                 ieee80211_rx_bss_put(dev, selected);
3375                 ifsta->state = IEEE80211_AUTHENTICATE;
3376                 ieee80211_sta_reset_auth(dev, ifsta);
3377                 return 0;
3378         } else {
3379                 if (ifsta->state != IEEE80211_AUTHENTICATE) {
3380                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
3381                                 ieee80211_sta_start_scan(dev, NULL, 0);
3382                         else
3383                                 ieee80211_sta_start_scan(dev, ifsta->ssid,
3384                                                          ifsta->ssid_len);
3385                         ifsta->state = IEEE80211_AUTHENTICATE;
3386                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
3387                 } else
3388                         ifsta->state = IEEE80211_DISABLED;
3389         }
3390         return -1;
3391 }
3392
3393
3394 static int ieee80211_sta_create_ibss(struct net_device *dev,
3395                                      struct ieee80211_if_sta *ifsta)
3396 {
3397         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3398         struct ieee80211_sta_bss *bss;
3399         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3400         struct ieee80211_supported_band *sband;
3401         u8 bssid[ETH_ALEN], *pos;
3402         int i;
3403         DECLARE_MAC_BUF(mac);
3404
3405 #if 0
3406         /* Easier testing, use fixed BSSID. */
3407         memset(bssid, 0xfe, ETH_ALEN);
3408 #else
3409         /* Generate random, not broadcast, locally administered BSSID. Mix in
3410          * own MAC address to make sure that devices that do not have proper
3411          * random number generator get different BSSID. */
3412         get_random_bytes(bssid, ETH_ALEN);
3413         for (i = 0; i < ETH_ALEN; i++)
3414                 bssid[i] ^= dev->dev_addr[i];
3415         bssid[0] &= ~0x01;
3416         bssid[0] |= 0x02;
3417 #endif
3418
3419         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
3420                dev->name, print_mac(mac, bssid));
3421
3422         bss = ieee80211_rx_bss_add(dev, bssid,
3423                                    local->hw.conf.channel->center_freq,
3424                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
3425         if (!bss)
3426                 return -ENOMEM;
3427
3428         bss->band = local->hw.conf.channel->band;
3429         sband = local->hw.wiphy->bands[bss->band];
3430
3431         if (local->hw.conf.beacon_int == 0)
3432                 local->hw.conf.beacon_int = 10000;
3433         bss->beacon_int = local->hw.conf.beacon_int;
3434         bss->last_update = jiffies;
3435         bss->capability = WLAN_CAPABILITY_IBSS;
3436         if (sdata->default_key) {
3437                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
3438         } else
3439                 sdata->drop_unencrypted = 0;
3440         bss->supp_rates_len = sband->n_bitrates;
3441         pos = bss->supp_rates;
3442         for (i = 0; i < sband->n_bitrates; i++) {
3443                 int rate = sband->bitrates[i].bitrate;
3444                 *pos++ = (u8) (rate / 5);
3445         }
3446
3447         return ieee80211_sta_join_ibss(dev, ifsta, bss);
3448 }
3449
3450
3451 static int ieee80211_sta_find_ibss(struct net_device *dev,
3452                                    struct ieee80211_if_sta *ifsta)
3453 {
3454         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3455         struct ieee80211_sta_bss *bss;
3456         int found = 0;
3457         u8 bssid[ETH_ALEN];
3458         int active_ibss;
3459         DECLARE_MAC_BUF(mac);
3460         DECLARE_MAC_BUF(mac2);
3461
3462         if (ifsta->ssid_len == 0)
3463                 return -EINVAL;
3464
3465         active_ibss = ieee80211_sta_active_ibss(dev);
3466 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3467         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
3468                dev->name, active_ibss);
3469 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3470         spin_lock_bh(&local->sta_bss_lock);
3471         list_for_each_entry(bss, &local->sta_bss_list, list) {
3472                 if (ifsta->ssid_len != bss->ssid_len ||
3473                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
3474                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
3475                         continue;
3476 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3477                 printk(KERN_DEBUG "   bssid=%s found\n",
3478                        print_mac(mac, bss->bssid));
3479 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3480                 memcpy(bssid, bss->bssid, ETH_ALEN);
3481                 found = 1;
3482                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
3483                         break;
3484         }
3485         spin_unlock_bh(&local->sta_bss_lock);
3486
3487 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3488         printk(KERN_DEBUG "   sta_find_ibss: selected %s current "
3489                "%s\n", print_mac(mac, bssid), print_mac(mac2, ifsta->bssid));
3490 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3491         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
3492             (bss = ieee80211_rx_bss_get(dev, bssid,
3493                                         local->hw.conf.channel->center_freq,
3494                                         ifsta->ssid, ifsta->ssid_len))) {
3495                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
3496                        " based on configured SSID\n",
3497                        dev->name, print_mac(mac, bssid));
3498                 return ieee80211_sta_join_ibss(dev, ifsta, bss);
3499         }
3500 #ifdef CONFIG_MAC80211_IBSS_DEBUG
3501         printk(KERN_DEBUG "   did not try to join ibss\n");
3502 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
3503
3504         /* Selected IBSS not found in current scan results - try to scan */
3505         if (ifsta->state == IEEE80211_IBSS_JOINED &&
3506             !ieee80211_sta_active_ibss(dev)) {
3507                 mod_timer(&ifsta->timer, jiffies +
3508                                       IEEE80211_IBSS_MERGE_INTERVAL);
3509         } else if (time_after(jiffies, local->last_scan_completed +
3510                               IEEE80211_SCAN_INTERVAL)) {
3511                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
3512                        "join\n", dev->name);
3513                 return ieee80211_sta_req_scan(dev, ifsta->ssid,
3514                                               ifsta->ssid_len);
3515         } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
3516                 int interval = IEEE80211_SCAN_INTERVAL;
3517
3518                 if (time_after(jiffies, ifsta->ibss_join_req +
3519                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
3520                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
3521                             (!(local->oper_channel->flags &
3522                                         IEEE80211_CHAN_NO_IBSS)))
3523                                 return ieee80211_sta_create_ibss(dev, ifsta);
3524                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
3525                                 printk(KERN_DEBUG "%s: IBSS not allowed on"
3526                                        " %d MHz\n", dev->name,
3527                                        local->hw.conf.channel->center_freq);
3528                         }
3529
3530                         /* No IBSS found - decrease scan interval and continue
3531                          * scanning. */
3532                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
3533                 }
3534
3535                 ifsta->state = IEEE80211_IBSS_SEARCH;
3536                 mod_timer(&ifsta->timer, jiffies + interval);
3537                 return 0;
3538         }
3539
3540         return 0;
3541 }
3542
3543
3544 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
3545 {
3546         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3547         struct ieee80211_if_sta *ifsta;
3548
3549         if (len > IEEE80211_MAX_SSID_LEN)
3550                 return -EINVAL;
3551
3552         ifsta = &sdata->u.sta;
3553
3554         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0)
3555                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3556         memcpy(ifsta->ssid, ssid, len);
3557         memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
3558         ifsta->ssid_len = len;
3559
3560         if (len)
3561                 ifsta->flags |= IEEE80211_STA_SSID_SET;
3562         else
3563                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3564         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3565             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
3566                 ifsta->ibss_join_req = jiffies;
3567                 ifsta->state = IEEE80211_IBSS_SEARCH;
3568                 return ieee80211_sta_find_ibss(dev, ifsta);
3569         }
3570         return 0;
3571 }
3572
3573
3574 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
3575 {
3576         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3577         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3578         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3579         *len = ifsta->ssid_len;
3580         return 0;
3581 }
3582
3583
3584 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
3585 {
3586         struct ieee80211_sub_if_data *sdata;
3587         struct ieee80211_if_sta *ifsta;
3588         int res;
3589
3590         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3591         ifsta = &sdata->u.sta;
3592
3593         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3594                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3595                 res = ieee80211_if_config(dev);
3596                 if (res) {
3597                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3598                                "the low-level driver\n", dev->name);
3599                         return res;
3600                 }
3601         }
3602
3603         if (is_valid_ether_addr(bssid))
3604                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3605         else
3606                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3607
3608         return 0;
3609 }
3610
3611
3612 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3613                                     struct ieee80211_sub_if_data *sdata,
3614                                     int powersave)
3615 {
3616         struct sk_buff *skb;
3617         struct ieee80211_hdr *nullfunc;
3618         u16 fc;
3619
3620         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3621         if (!skb) {
3622                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3623                        "frame\n", sdata->dev->name);
3624                 return;
3625         }
3626         skb_reserve(skb, local->hw.extra_tx_headroom);
3627
3628         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3629         memset(nullfunc, 0, 24);
3630         fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3631              IEEE80211_FCTL_TODS;
3632         if (powersave)
3633                 fc |= IEEE80211_FCTL_PM;
3634         nullfunc->frame_control = cpu_to_le16(fc);
3635         memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3636         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3637         memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3638
3639         ieee80211_sta_tx(sdata->dev, skb, 0);
3640 }
3641
3642
3643 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3644 {
3645         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
3646             ieee80211_vif_is_mesh(&sdata->vif))
3647                 ieee80211_sta_timer((unsigned long)sdata);
3648 }
3649
3650 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3651 {
3652         struct ieee80211_local *local = hw_to_local(hw);
3653         struct net_device *dev = local->scan_dev;
3654         struct ieee80211_sub_if_data *sdata;
3655         union iwreq_data wrqu;
3656
3657         local->last_scan_completed = jiffies;
3658         memset(&wrqu, 0, sizeof(wrqu));
3659         wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3660
3661         if (local->sta_hw_scanning) {
3662                 local->sta_hw_scanning = 0;
3663                 if (ieee80211_hw_config(local))
3664                         printk(KERN_DEBUG "%s: failed to restore operational "
3665                                "channel after scan\n", dev->name);
3666                 /* Restart STA timer for HW scan case */
3667                 rcu_read_lock();
3668                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
3669                         ieee80211_restart_sta_timer(sdata);
3670                 rcu_read_unlock();
3671
3672                 goto done;
3673         }
3674
3675         local->sta_sw_scanning = 0;
3676         if (ieee80211_hw_config(local))
3677                 printk(KERN_DEBUG "%s: failed to restore operational "
3678                        "channel after scan\n", dev->name);
3679
3680
3681         netif_tx_lock_bh(local->mdev);
3682         local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3683         local->ops->configure_filter(local_to_hw(local),
3684                                      FIF_BCN_PRBRESP_PROMISC,
3685                                      &local->filter_flags,
3686                                      local->mdev->mc_count,
3687                                      local->mdev->mc_list);
3688
3689         netif_tx_unlock_bh(local->mdev);
3690
3691         rcu_read_lock();
3692         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3693
3694                 /* No need to wake the master device. */
3695                 if (sdata->dev == local->mdev)
3696                         continue;
3697
3698                 /* Tell AP we're back */
3699                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3700                     sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
3701                         ieee80211_send_nullfunc(local, sdata, 0);
3702
3703                 ieee80211_restart_sta_timer(sdata);
3704
3705                 netif_wake_queue(sdata->dev);
3706         }
3707         rcu_read_unlock();
3708
3709 done:
3710         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3711         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3712                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3713                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3714                     (!ifsta->state == IEEE80211_IBSS_JOINED &&
3715                     !ieee80211_sta_active_ibss(dev)))
3716                         ieee80211_sta_find_ibss(dev, ifsta);
3717         }
3718 }
3719 EXPORT_SYMBOL(ieee80211_scan_completed);
3720
3721 void ieee80211_sta_scan_work(struct work_struct *work)
3722 {
3723         struct ieee80211_local *local =
3724                 container_of(work, struct ieee80211_local, scan_work.work);
3725         struct net_device *dev = local->scan_dev;
3726         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3727         struct ieee80211_supported_band *sband;
3728         struct ieee80211_channel *chan;
3729         int skip;
3730         unsigned long next_delay = 0;
3731
3732         if (!local->sta_sw_scanning)
3733                 return;
3734
3735         switch (local->scan_state) {
3736         case SCAN_SET_CHANNEL:
3737                 /*
3738                  * Get current scan band. scan_band may be IEEE80211_NUM_BANDS
3739                  * after we successfully scanned the last channel of the last
3740                  * band (and the last band is supported by the hw)
3741                  */
3742                 if (local->scan_band < IEEE80211_NUM_BANDS)
3743                         sband = local->hw.wiphy->bands[local->scan_band];
3744                 else
3745                         sband = NULL;
3746
3747                 /*
3748                  * If we are at an unsupported band and have more bands
3749                  * left to scan, advance to the next supported one.
3750                  */
3751                 while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
3752                         local->scan_band++;
3753                         sband = local->hw.wiphy->bands[local->scan_band];
3754                         local->scan_channel_idx = 0;
3755                 }
3756
3757                 /* if no more bands/channels left, complete scan */
3758                 if (!sband || local->scan_channel_idx >= sband->n_channels) {
3759                         ieee80211_scan_completed(local_to_hw(local));
3760                         return;
3761                 }
3762                 skip = 0;
3763                 chan = &sband->channels[local->scan_channel_idx];
3764
3765                 if (chan->flags & IEEE80211_CHAN_DISABLED ||
3766                     (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3767                      chan->flags & IEEE80211_CHAN_NO_IBSS))
3768                         skip = 1;
3769
3770                 if (!skip) {
3771                         local->scan_channel = chan;
3772                         if (ieee80211_hw_config(local)) {
3773                                 printk(KERN_DEBUG "%s: failed to set freq to "
3774                                        "%d MHz for scan\n", dev->name,
3775                                        chan->center_freq);
3776                                 skip = 1;
3777                         }
3778                 }
3779
3780                 /* advance state machine to next channel/band */
3781                 local->scan_channel_idx++;
3782                 if (local->scan_channel_idx >= sband->n_channels) {
3783                         /*
3784                          * scan_band may end up == IEEE80211_NUM_BANDS, but
3785                          * we'll catch that case above and complete the scan
3786                          * if that is the case.
3787                          */
3788                         local->scan_band++;
3789                         local->scan_channel_idx = 0;
3790                 }
3791
3792                 if (skip)
3793                         break;
3794
3795                 next_delay = IEEE80211_PROBE_DELAY +
3796                              usecs_to_jiffies(local->hw.channel_change_time);
3797                 local->scan_state = SCAN_SEND_PROBE;
3798                 break;
3799         case SCAN_SEND_PROBE:
3800                 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3801                 local->scan_state = SCAN_SET_CHANNEL;
3802
3803                 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
3804                         break;
3805                 ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
3806                                          local->scan_ssid_len);
3807                 next_delay = IEEE80211_CHANNEL_TIME;
3808                 break;
3809         }
3810
3811         if (local->sta_sw_scanning)
3812                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3813                                    next_delay);
3814 }
3815
3816
3817 static int ieee80211_sta_start_scan(struct net_device *dev,
3818                                     u8 *ssid, size_t ssid_len)
3819 {
3820         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3821         struct ieee80211_sub_if_data *sdata;
3822
3823         if (ssid_len > IEEE80211_MAX_SSID_LEN)
3824                 return -EINVAL;
3825
3826         /* MLME-SCAN.request (page 118)  page 144 (11.1.3.1)
3827          * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
3828          * BSSID: MACAddress
3829          * SSID
3830          * ScanType: ACTIVE, PASSIVE
3831          * ProbeDelay: delay (in microseconds) to be used prior to transmitting
3832          *    a Probe frame during active scanning
3833          * ChannelList
3834          * MinChannelTime (>= ProbeDelay), in TU
3835          * MaxChannelTime: (>= MinChannelTime), in TU
3836          */
3837
3838          /* MLME-SCAN.confirm
3839           * BSSDescriptionSet
3840           * ResultCode: SUCCESS, INVALID_PARAMETERS
3841          */
3842
3843         if (local->sta_sw_scanning || local->sta_hw_scanning) {
3844                 if (local->scan_dev == dev)
3845                         return 0;
3846                 return -EBUSY;
3847         }
3848
3849         if (local->ops->hw_scan) {
3850                 int rc = local->ops->hw_scan(local_to_hw(local),
3851                                              ssid, ssid_len);
3852                 if (!rc) {
3853                         local->sta_hw_scanning = 1;
3854                         local->scan_dev = dev;
3855                 }
3856                 return rc;
3857         }
3858
3859         local->sta_sw_scanning = 1;
3860
3861         rcu_read_lock();
3862         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3863
3864                 /* Don't stop the master interface, otherwise we can't transmit
3865                  * probes! */
3866                 if (sdata->dev == local->mdev)
3867                         continue;
3868
3869                 netif_stop_queue(sdata->dev);
3870                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3871                     (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
3872                         ieee80211_send_nullfunc(local, sdata, 1);
3873         }
3874         rcu_read_unlock();
3875
3876         if (ssid) {
3877                 local->scan_ssid_len = ssid_len;
3878                 memcpy(local->scan_ssid, ssid, ssid_len);
3879         } else
3880                 local->scan_ssid_len = 0;
3881         local->scan_state = SCAN_SET_CHANNEL;
3882         local->scan_channel_idx = 0;
3883         local->scan_band = IEEE80211_BAND_2GHZ;
3884         local->scan_dev = dev;
3885
3886         netif_tx_lock_bh(local->mdev);
3887         local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
3888         local->ops->configure_filter(local_to_hw(local),
3889                                      FIF_BCN_PRBRESP_PROMISC,
3890                                      &local->filter_flags,
3891                                      local->mdev->mc_count,
3892                                      local->mdev->mc_list);
3893         netif_tx_unlock_bh(local->mdev);
3894
3895         /* TODO: start scan as soon as all nullfunc frames are ACKed */
3896         queue_delayed_work(local->hw.workqueue, &local->scan_work,
3897                            IEEE80211_CHANNEL_TIME);
3898
3899         return 0;
3900 }
3901
3902
3903 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
3904 {
3905         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3906         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3907         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3908
3909         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3910                 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
3911
3912         if (local->sta_sw_scanning || local->sta_hw_scanning) {
3913                 if (local->scan_dev == dev)
3914                         return 0;
3915                 return -EBUSY;
3916         }
3917
3918         ifsta->scan_ssid_len = ssid_len;
3919         if (ssid_len)
3920                 memcpy(ifsta->scan_ssid, ssid, ssid_len);
3921         set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
3922         queue_work(local->hw.workqueue, &ifsta->work);
3923         return 0;
3924 }
3925
3926 static char *
3927 ieee80211_sta_scan_result(struct net_device *dev,
3928                           struct ieee80211_sta_bss *bss,
3929                           char *current_ev, char *end_buf)
3930 {
3931         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3932         struct iw_event iwe;
3933
3934         if (time_after(jiffies,
3935                        bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
3936                 return current_ev;
3937
3938         memset(&iwe, 0, sizeof(iwe));
3939         iwe.cmd = SIOCGIWAP;
3940         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
3941         memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
3942         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
3943                                           IW_EV_ADDR_LEN);
3944
3945         memset(&iwe, 0, sizeof(iwe));
3946         iwe.cmd = SIOCGIWESSID;
3947         if (bss_mesh_cfg(bss)) {
3948                 iwe.u.data.length = bss_mesh_id_len(bss);
3949                 iwe.u.data.flags = 1;
3950                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3951                                                   bss_mesh_id(bss));
3952         } else {
3953                 iwe.u.data.length = bss->ssid_len;
3954                 iwe.u.data.flags = 1;
3955                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3956                                                   bss->ssid);
3957         }
3958
3959         if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
3960             || bss_mesh_cfg(bss)) {
3961                 memset(&iwe, 0, sizeof(iwe));
3962                 iwe.cmd = SIOCGIWMODE;
3963                 if (bss_mesh_cfg(bss))
3964                         iwe.u.mode = IW_MODE_MESH;
3965                 else if (bss->capability & WLAN_CAPABILITY_ESS)
3966                         iwe.u.mode = IW_MODE_MASTER;
3967                 else
3968                         iwe.u.mode = IW_MODE_ADHOC;
3969                 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
3970                                                   IW_EV_UINT_LEN);
3971         }
3972
3973         memset(&iwe, 0, sizeof(iwe));
3974         iwe.cmd = SIOCGIWFREQ;
3975         iwe.u.freq.m = bss->freq;
3976         iwe.u.freq.e = 6;
3977         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
3978                                           IW_EV_FREQ_LEN);
3979
3980         memset(&iwe, 0, sizeof(iwe));
3981         iwe.cmd = SIOCGIWFREQ;
3982         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
3983         iwe.u.freq.e = 0;
3984         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
3985                                           IW_EV_FREQ_LEN);
3986
3987         memset(&iwe, 0, sizeof(iwe));
3988         iwe.cmd = IWEVQUAL;
3989         iwe.u.qual.qual = bss->signal;
3990         iwe.u.qual.level = bss->rssi;
3991         iwe.u.qual.noise = bss->noise;
3992         iwe.u.qual.updated = local->wstats_flags;
3993         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
3994                                           IW_EV_QUAL_LEN);
3995
3996         memset(&iwe, 0, sizeof(iwe));
3997         iwe.cmd = SIOCGIWENCODE;
3998         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
3999                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
4000         else
4001                 iwe.u.data.flags = IW_ENCODE_DISABLED;
4002         iwe.u.data.length = 0;
4003         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, "");
4004
4005         if (bss && bss->wpa_ie) {
4006                 memset(&iwe, 0, sizeof(iwe));
4007                 iwe.cmd = IWEVGENIE;
4008                 iwe.u.data.length = bss->wpa_ie_len;
4009                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
4010                                                   bss->wpa_ie);
4011         }
4012
4013         if (bss && bss->rsn_ie) {
4014                 memset(&iwe, 0, sizeof(iwe));
4015                 iwe.cmd = IWEVGENIE;
4016                 iwe.u.data.length = bss->rsn_ie_len;
4017                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
4018                                                   bss->rsn_ie);
4019         }
4020
4021         if (bss && bss->supp_rates_len > 0) {
4022                 /* display all supported rates in readable format */
4023                 char *p = current_ev + IW_EV_LCP_LEN;
4024                 int i;
4025
4026                 memset(&iwe, 0, sizeof(iwe));
4027                 iwe.cmd = SIOCGIWRATE;
4028                 /* Those two flags are ignored... */
4029                 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
4030
4031                 for (i = 0; i < bss->supp_rates_len; i++) {
4032                         iwe.u.bitrate.value = ((bss->supp_rates[i] &
4033                                                         0x7f) * 500000);
4034                         p = iwe_stream_add_value(current_ev, p,
4035                                         end_buf, &iwe, IW_EV_PARAM_LEN);
4036                 }
4037                 current_ev = p;
4038         }
4039
4040         if (bss) {
4041                 char *buf;
4042                 buf = kmalloc(30, GFP_ATOMIC);
4043                 if (buf) {
4044                         memset(&iwe, 0, sizeof(iwe));
4045                         iwe.cmd = IWEVCUSTOM;
4046                         sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
4047                         iwe.u.data.length = strlen(buf);
4048                         current_ev = iwe_stream_add_point(current_ev, end_buf,
4049                                                           &iwe, buf);
4050                         kfree(buf);
4051                 }
4052         }
4053
4054         if (bss_mesh_cfg(bss)) {
4055                 char *buf;
4056                 u8 *cfg = bss_mesh_cfg(bss);
4057                 buf = kmalloc(50, GFP_ATOMIC);
4058                 if (buf) {
4059                         memset(&iwe, 0, sizeof(iwe));
4060                         iwe.cmd = IWEVCUSTOM;
4061                         sprintf(buf, "Mesh network (version %d)", cfg[0]);
4062                         iwe.u.data.length = strlen(buf);
4063                         current_ev = iwe_stream_add_point(current_ev, end_buf,
4064                                                           &iwe, buf);
4065                         sprintf(buf, "Path Selection Protocol ID: "
4066                                 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
4067                                                         cfg[4]);
4068                         iwe.u.data.length = strlen(buf);
4069                         current_ev = iwe_stream_add_point(current_ev, end_buf,
4070                                                           &iwe, buf);
4071                         sprintf(buf, "Path Selection Metric ID: "
4072                                 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
4073                                                         cfg[8]);
4074                         iwe.u.data.length = strlen(buf);
4075                         current_ev = iwe_stream_add_point(current_ev, end_buf,
4076                                                           &iwe, buf);
4077                         sprintf(buf, "Congestion Control Mode ID: "
4078                                 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
4079                                                         cfg[11], cfg[12]);
4080                         iwe.u.data.length = strlen(buf);
4081                         current_ev = iwe_stream_add_point(current_ev, end_buf,
4082                                                           &iwe, buf);
4083                         sprintf(buf, "Channel Precedence: "
4084                                 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
4085                                                         cfg[15], cfg[16]);
4086                         iwe.u.data.length = strlen(buf);
4087                         current_ev = iwe_stream_add_point(current_ev, end_buf,
4088                                                           &iwe, buf);
4089                         kfree(buf);
4090                 }
4091         }
4092
4093         return current_ev;
4094 }
4095
4096
4097 int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len)
4098 {
4099         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4100         char *current_ev = buf;
4101         char *end_buf = buf + len;
4102         struct ieee80211_sta_bss *bss;
4103
4104         spin_lock_bh(&local->sta_bss_lock);
4105         list_for_each_entry(bss, &local->sta_bss_list, list) {
4106                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
4107                         spin_unlock_bh(&local->sta_bss_lock);
4108                         return -E2BIG;
4109                 }
4110                 current_ev = ieee80211_sta_scan_result(dev, bss, current_ev,
4111                                                        end_buf);
4112         }
4113         spin_unlock_bh(&local->sta_bss_lock);
4114         return current_ev - buf;
4115 }
4116
4117
4118 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
4119 {
4120         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4121         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4122         kfree(ifsta->extra_ie);
4123         if (len == 0) {
4124                 ifsta->extra_ie = NULL;
4125                 ifsta->extra_ie_len = 0;
4126                 return 0;
4127         }
4128         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
4129         if (!ifsta->extra_ie) {
4130                 ifsta->extra_ie_len = 0;
4131                 return -ENOMEM;
4132         }
4133         memcpy(ifsta->extra_ie, ie, len);
4134         ifsta->extra_ie_len = len;
4135         return 0;
4136 }
4137
4138
4139 struct sta_info * ieee80211_ibss_add_sta(struct net_device *dev,
4140                                          struct sk_buff *skb, u8 *bssid,
4141                                          u8 *addr)
4142 {
4143         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4144         struct sta_info *sta;
4145         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4146         DECLARE_MAC_BUF(mac);
4147
4148         /* TODO: Could consider removing the least recently used entry and
4149          * allow new one to be added. */
4150         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
4151                 if (net_ratelimit()) {
4152                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
4153                                "entry %s\n", dev->name, print_mac(mac, addr));
4154                 }
4155                 return NULL;
4156         }
4157
4158         printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
4159                wiphy_name(local->hw.wiphy), print_mac(mac, addr), dev->name);
4160
4161         sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
4162         if (!sta)
4163                 return NULL;
4164
4165         sta->flags |= WLAN_STA_AUTHORIZED;
4166
4167         sta->supp_rates[local->hw.conf.channel->band] =
4168                 sdata->u.sta.supp_rates_bits[local->hw.conf.channel->band];
4169
4170         rate_control_rate_init(sta, local);
4171
4172         if (sta_info_insert(sta))
4173                 return NULL;
4174
4175         return sta;
4176 }
4177
4178
4179 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
4180 {
4181         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4182         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4183
4184         printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
4185                dev->name, reason);
4186
4187         if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
4188             sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
4189                 return -EINVAL;
4190
4191         ieee80211_send_deauth(dev, ifsta, reason);
4192         ieee80211_set_disassoc(dev, ifsta, 1);
4193         return 0;
4194 }
4195
4196
4197 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
4198 {
4199         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4200         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
4201
4202         printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
4203                dev->name, reason);
4204
4205         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
4206                 return -EINVAL;
4207
4208         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
4209                 return -1;
4210
4211         ieee80211_send_disassoc(dev, ifsta, reason);
4212         ieee80211_set_disassoc(dev, ifsta, 0);
4213         return 0;
4214 }