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 <net/iw_handler.h>
  28 #include <asm/types.h>
  29
  30 #include <net/mac80211.h>
  31 #include "ieee80211_i.h"
  32 #include "ieee80211_rate.h"
  33 #include "ieee80211_led.h"
  34
  35 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  36 #define IEEE80211_AUTH_MAX_TRIES 3
  37 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  38 #define IEEE80211_ASSOC_MAX_TRIES 3
  39 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  40 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  41 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  42 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  43 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  44 #define IEEE80211_IBSS_JOIN_TIMEOUT (20 * HZ)
  45
  46 #define IEEE80211_PROBE_DELAY (HZ / 33)
  47 #define IEEE80211_CHANNEL_TIME (HZ / 33)
  48 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
  49 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
  50 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  51 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  52
  53 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  54
  55
  56 #define IEEE80211_FC(type, stype) cpu_to_le16(type | stype)
  57
  58 #define ERP_INFO_USE_PROTECTION BIT(1)
  59
  60 /* mgmt header + 1 byte action code */
  61 #define IEEE80211_MIN_ACTION_SIZE (24 + 1)
  62
  63 #define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
  64 #define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
  65 #define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0
  66 #define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
  67 #define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
  68
  69 /* next values represent the buffer size for A-MPDU frame.
  70  * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */
  71 #define IEEE80211_MIN_AMPDU_BUF 0x8
  72 #define IEEE80211_MAX_AMPDU_BUF 0x40
  73
  74 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
  75                                      u8 *ssid, size_t ssid_len);
  76 static struct ieee80211_sta_bss *
  77 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
  78                      u8 *ssid, u8 ssid_len);
  79 static void ieee80211_rx_bss_put(struct net_device *dev,
  80                                  struct ieee80211_sta_bss *bss);
  81 static int ieee80211_sta_find_ibss(struct net_device *dev,
  82                                    struct ieee80211_if_sta *ifsta);
  83 static int ieee80211_sta_wep_configured(struct net_device *dev);
  84 static int ieee80211_sta_start_scan(struct net_device *dev,
  85                                     u8 *ssid, size_t ssid_len);
  86 static int ieee80211_sta_config_auth(struct net_device *dev,
  87                                      struct ieee80211_if_sta *ifsta);
  88
  89
  90 /* Parsed Information Elements */
  91 struct ieee802_11_elems {
  92         /* pointers to IEs */
  93         u8 *ssid;
  94         u8 *supp_rates;
  95         u8 *fh_params;
  96         u8 *ds_params;
  97         u8 *cf_params;
  98         u8 *tim;
  99         u8 *ibss_params;
 100         u8 *challenge;
 101         u8 *wpa;
 102         u8 *rsn;
 103         u8 *erp_info;
 104         u8 *ext_supp_rates;
 105         u8 *wmm_info;
 106         u8 *wmm_param;
 107         u8 *ht_cap_elem;
 108         u8 *ht_info_elem;
 109         /* length of them, respectively */
 110         u8 ssid_len;
 111         u8 supp_rates_len;
 112         u8 fh_params_len;
 113         u8 ds_params_len;
 114         u8 cf_params_len;
 115         u8 tim_len;
 116         u8 ibss_params_len;
 117         u8 challenge_len;
 118         u8 wpa_len;
 119         u8 rsn_len;
 120         u8 erp_info_len;
 121         u8 ext_supp_rates_len;
 122         u8 wmm_info_len;
 123         u8 wmm_param_len;
 124         u8 ht_cap_elem_len;
 125         u8 ht_info_elem_len;
 126 };
 127
 128 static void ieee802_11_parse_elems(u8 *start, size_t len,
 129                                    struct ieee802_11_elems *elems)
 130 {
 131         size_t left = len;
 132         u8 *pos = start;
 133
 134         memset(elems, 0, sizeof(*elems));
 135
 136         while (left >= 2) {
 137                 u8 id, elen;
 138
 139                 id = *pos++;
 140                 elen = *pos++;
 141                 left -= 2;
 142
 143                 if (elen > left)
 144                         return;
 145
 146                 switch (id) {
 147                 case WLAN_EID_SSID:
 148                         elems->ssid = pos;
 149                         elems->ssid_len = elen;
 150                         break;
 151                 case WLAN_EID_SUPP_RATES:
 152                         elems->supp_rates = pos;
 153                         elems->supp_rates_len = elen;
 154                         break;
 155                 case WLAN_EID_FH_PARAMS:
 156                         elems->fh_params = pos;
 157                         elems->fh_params_len = elen;
 158                         break;
 159                 case WLAN_EID_DS_PARAMS:
 160                         elems->ds_params = pos;
 161                         elems->ds_params_len = elen;
 162                         break;
 163                 case WLAN_EID_CF_PARAMS:
 164                         elems->cf_params = pos;
 165                         elems->cf_params_len = elen;
 166                         break;
 167                 case WLAN_EID_TIM:
 168                         elems->tim = pos;
 169                         elems->tim_len = elen;
 170                         break;
 171                 case WLAN_EID_IBSS_PARAMS:
 172                         elems->ibss_params = pos;
 173                         elems->ibss_params_len = elen;
 174                         break;
 175                 case WLAN_EID_CHALLENGE:
 176                         elems->challenge = pos;
 177                         elems->challenge_len = elen;
 178                         break;
 179                 case WLAN_EID_WPA:
 180                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 181                             pos[2] == 0xf2) {
 182                                 /* Microsoft OUI (00:50:F2) */
 183                                 if (pos[3] == 1) {
 184                                         /* OUI Type 1 - WPA IE */
 185                                         elems->wpa = pos;
 186                                         elems->wpa_len = elen;
 187                                 } else if (elen >= 5 && pos[3] == 2) {
 188                                         if (pos[4] == 0) {
 189                                                 elems->wmm_info = pos;
 190                                                 elems->wmm_info_len = elen;
 191                                         } else if (pos[4] == 1) {
 192                                                 elems->wmm_param = pos;
 193                                                 elems->wmm_param_len = elen;
 194                                         }
 195                                 }
 196                         }
 197                         break;
 198                 case WLAN_EID_RSN:
 199                         elems->rsn = pos;
 200                         elems->rsn_len = elen;
 201                         break;
 202                 case WLAN_EID_ERP_INFO:
 203                         elems->erp_info = pos;
 204                         elems->erp_info_len = elen;
 205                         break;
 206                 case WLAN_EID_EXT_SUPP_RATES:
 207                         elems->ext_supp_rates = pos;
 208                         elems->ext_supp_rates_len = elen;
 209                         break;
 210                 case WLAN_EID_HT_CAPABILITY:
 211                         elems->ht_cap_elem = pos;
 212                         elems->ht_cap_elem_len = elen;
 213                         break;
 214                 case WLAN_EID_HT_EXTRA_INFO:
 215                         elems->ht_info_elem = pos;
 216                         elems->ht_info_elem_len = elen;
 217                         break;
 218                 default:
 219                         break;
 220                 }
 221
 222                 left -= elen;
 223                 pos += elen;
 224         }
 225 }
 226
 227
 228 static int ecw2cw(int ecw)
 229 {
 230         int cw = 1;
 231         while (ecw > 0) {
 232                 cw <<= 1;
 233                 ecw--;
 234         }
 235         return cw - 1;
 236 }
 237
 238 static void ieee80211_sta_wmm_params(struct net_device *dev,
 239                                      struct ieee80211_if_sta *ifsta,
 240                                      u8 *wmm_param, size_t wmm_param_len)
 241 {
 242         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 243         struct ieee80211_tx_queue_params params;
 244         size_t left;
 245         int count;
 246         u8 *pos;
 247
 248         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 249                 return;
 250         count = wmm_param[6] & 0x0f;
 251         if (count == ifsta->wmm_last_param_set)
 252                 return;
 253         ifsta->wmm_last_param_set = count;
 254
 255         pos = wmm_param + 8;
 256         left = wmm_param_len - 8;
 257
 258         memset(&params, 0, sizeof(params));
 259
 260         if (!local->ops->conf_tx)
 261                 return;
 262
 263         local->wmm_acm = 0;
 264         for (; left >= 4; left -= 4, pos += 4) {
 265                 int aci = (pos[0] >> 5) & 0x03;
 266                 int acm = (pos[0] >> 4) & 0x01;
 267                 int queue;
 268
 269                 switch (aci) {
 270                 case 1:
 271                         queue = IEEE80211_TX_QUEUE_DATA3;
 272                         if (acm) {
 273                                 local->wmm_acm |= BIT(0) | BIT(3);
 274                         }
 275                         break;
 276                 case 2:
 277                         queue = IEEE80211_TX_QUEUE_DATA1;
 278                         if (acm) {
 279                                 local->wmm_acm |= BIT(4) | BIT(5);
 280                         }
 281                         break;
 282                 case 3:
 283                         queue = IEEE80211_TX_QUEUE_DATA0;
 284                         if (acm) {
 285                                 local->wmm_acm |= BIT(6) | BIT(7);
 286                         }
 287                         break;
 288                 case 0:
 289                 default:
 290                         queue = IEEE80211_TX_QUEUE_DATA2;
 291                         if (acm) {
 292                                 local->wmm_acm |= BIT(1) | BIT(2);
 293                         }
 294                         break;
 295                 }
 296
 297                 params.aifs = pos[0] & 0x0f;
 298                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 299                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 300                 /* TXOP is in units of 32 usec; burst_time in 0.1 ms */
 301                 params.burst_time = (pos[2] | (pos[3] << 8)) * 32 / 100;
 302                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 303                        "cWmin=%d cWmax=%d burst=%d\n",
 304                        dev->name, queue, aci, acm, params.aifs, params.cw_min,
 305                        params.cw_max, params.burst_time);
 306                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 307                  * AC for now) */
 308                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 309                         printk(KERN_DEBUG "%s: failed to set TX queue "
 310                                "parameters for queue %d\n", dev->name, queue);
 311                 }
 312         }
 313 }
 314
 315
 316 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
 317                                    u8 erp_value)
 318 {
 319         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
 320         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 321         bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
 322         bool preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
 323         DECLARE_MAC_BUF(mac);
 324         u32 changed = 0;
 325
 326         if (use_protection != bss_conf->use_cts_prot) {
 327                 if (net_ratelimit()) {
 328                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
 329                                "%s)\n",
 330                                sdata->dev->name,
 331                                use_protection ? "enabled" : "disabled",
 332                                print_mac(mac, ifsta->bssid));
 333                 }
 334                 bss_conf->use_cts_prot = use_protection;
 335                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 336         }
 337
 338         if (preamble_mode != bss_conf->use_short_preamble) {
 339                 if (net_ratelimit()) {
 340                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 341                                " (BSSID=%s)\n",
 342                                sdata->dev->name,
 343                                (preamble_mode == WLAN_ERP_PREAMBLE_SHORT) ?
 344                                         "short" : "long",
 345                                print_mac(mac, ifsta->bssid));
 346                 }
 347                 bss_conf->use_short_preamble = preamble_mode;
 348                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 349         }
 350
 351         return changed;
 352 }
 353
 354 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
 355                                    struct ieee80211_ht_info *ht_info)
 356 {
 357
 358         if (ht_info == NULL)
 359                 return -EINVAL;
 360
 361         memset(ht_info, 0, sizeof(*ht_info));
 362
 363         if (ht_cap_ie) {
 364                 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
 365
 366                 ht_info->ht_supported = 1;
 367                 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
 368                 ht_info->ampdu_factor =
 369                         ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
 370                 ht_info->ampdu_density =
 371                         (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
 372                 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
 373         } else
 374                 ht_info->ht_supported = 0;
 375
 376         return 0;
 377 }
 378
 379 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
 380                         struct ieee80211_ht_addt_info *ht_add_info_ie,
 381                         struct ieee80211_ht_bss_info *bss_info)
 382 {
 383         if (bss_info == NULL)
 384                 return -EINVAL;
 385
 386         memset(bss_info, 0, sizeof(*bss_info));
 387
 388         if (ht_add_info_ie) {
 389                 u16 op_mode;
 390                 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
 391
 392                 bss_info->primary_channel = ht_add_info_ie->control_chan;
 393                 bss_info->bss_cap = ht_add_info_ie->ht_param;
 394                 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
 395         }
 396
 397         return 0;
 398 }
 399
 400 static void ieee80211_sta_send_associnfo(struct net_device *dev,
 401                                          struct ieee80211_if_sta *ifsta)
 402 {
 403         char *buf;
 404         size_t len;
 405         int i;
 406         union iwreq_data wrqu;
 407
 408         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 409                 return;
 410
 411         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 412                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 413         if (!buf)
 414                 return;
 415
 416         len = sprintf(buf, "ASSOCINFO(");
 417         if (ifsta->assocreq_ies) {
 418                 len += sprintf(buf + len, "ReqIEs=");
 419                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 420                         len += sprintf(buf + len, "%02x",
 421                                        ifsta->assocreq_ies[i]);
 422                 }
 423         }
 424         if (ifsta->assocresp_ies) {
 425                 if (ifsta->assocreq_ies)
 426                         len += sprintf(buf + len, " ");
 427                 len += sprintf(buf + len, "RespIEs=");
 428                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 429                         len += sprintf(buf + len, "%02x",
 430                                        ifsta->assocresp_ies[i]);
 431                 }
 432         }
 433         len += sprintf(buf + len, ")");
 434
 435         if (len > IW_CUSTOM_MAX) {
 436                 len = sprintf(buf, "ASSOCRESPIE=");
 437                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 438                         len += sprintf(buf + len, "%02x",
 439                                        ifsta->assocresp_ies[i]);
 440                 }
 441         }
 442
 443         memset(&wrqu, 0, sizeof(wrqu));
 444         wrqu.data.length = len;
 445         wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 446
 447         kfree(buf);
 448 }
 449
 450
 451 static void ieee80211_set_associated(struct net_device *dev,
 452                                      struct ieee80211_if_sta *ifsta,
 453                                      bool assoc)
 454 {
 455         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 456         struct ieee80211_local *local = sdata->local;
 457         union iwreq_data wrqu;
 458         u32 changed = BSS_CHANGED_ASSOC;
 459
 460         if (assoc) {
 461                 struct ieee80211_sta_bss *bss;
 462
 463                 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 464
 465                 if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
 466                         return;
 467
 468                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
 469                                            local->hw.conf.channel,
 470                                            ifsta->ssid, ifsta->ssid_len);
 471                 if (bss) {
 472                         if (bss->has_erp_value)
 473                                 changed |= ieee80211_handle_erp_ie(
 474                                                 sdata, bss->erp_value);
 475                         ieee80211_rx_bss_put(dev, bss);
 476                 }
 477
 478                 netif_carrier_on(dev);
 479                 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 480                 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 481                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 482                 ieee80211_sta_send_associnfo(dev, ifsta);
 483         } else {
 484                 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 485
 486                 netif_carrier_off(dev);
 487                 ieee80211_reset_erp_info(dev);
 488                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 489         }
 490         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 491         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 492         ifsta->last_probe = jiffies;
 493         ieee80211_led_assoc(local, assoc);
 494
 495         ieee80211_bss_info_change_notify(sdata, changed);
 496 }
 497
 498 static void ieee80211_set_disassoc(struct net_device *dev,
 499                                    struct ieee80211_if_sta *ifsta, int deauth)
 500 {
 501         if (deauth)
 502                 ifsta->auth_tries = 0;
 503         ifsta->assoc_tries = 0;
 504         ieee80211_set_associated(dev, ifsta, 0);
 505 }
 506
 507 static void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
 508                              int encrypt)
 509 {
 510         struct ieee80211_sub_if_data *sdata;
 511         struct ieee80211_tx_packet_data *pkt_data;
 512
 513         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 514         skb->dev = sdata->local->mdev;
 515         skb_set_mac_header(skb, 0);
 516         skb_set_network_header(skb, 0);
 517         skb_set_transport_header(skb, 0);
 518
 519         pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 520         memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
 521         pkt_data->ifindex = sdata->dev->ifindex;
 522         if (!encrypt)
 523                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 524
 525         dev_queue_xmit(skb);
 526 }
 527
 528
 529 static void ieee80211_send_auth(struct net_device *dev,
 530                                 struct ieee80211_if_sta *ifsta,
 531                                 int transaction, u8 *extra, size_t extra_len,
 532                                 int encrypt)
 533 {
 534         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 535         struct sk_buff *skb;
 536         struct ieee80211_mgmt *mgmt;
 537
 538         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 539                             sizeof(*mgmt) + 6 + extra_len);
 540         if (!skb) {
 541                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 542                        "frame\n", dev->name);
 543                 return;
 544         }
 545         skb_reserve(skb, local->hw.extra_tx_headroom);
 546
 547         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 548         memset(mgmt, 0, 24 + 6);
 549         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 550                                            IEEE80211_STYPE_AUTH);
 551         if (encrypt)
 552                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 553         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 554         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 555         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 556         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 557         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 558         ifsta->auth_transaction = transaction + 1;
 559         mgmt->u.auth.status_code = cpu_to_le16(0);
 560         if (extra)
 561                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 562
 563         ieee80211_sta_tx(dev, skb, encrypt);
 564 }
 565
 566
 567 static void ieee80211_authenticate(struct net_device *dev,
 568                                    struct ieee80211_if_sta *ifsta)
 569 {
 570         DECLARE_MAC_BUF(mac);
 571
 572         ifsta->auth_tries++;
 573         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 574                 printk(KERN_DEBUG "%s: authentication with AP %s"
 575                        " timed out\n",
 576                        dev->name, print_mac(mac, ifsta->bssid));
 577                 ifsta->state = IEEE80211_DISABLED;
 578                 return;
 579         }
 580
 581         ifsta->state = IEEE80211_AUTHENTICATE;
 582         printk(KERN_DEBUG "%s: authenticate with AP %s\n",
 583                dev->name, print_mac(mac, ifsta->bssid));
 584
 585         ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
 586
 587         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 588 }
 589
 590
 591 static void ieee80211_send_assoc(struct net_device *dev,
 592                                  struct ieee80211_if_sta *ifsta)
 593 {
 594         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 595         struct ieee80211_hw_mode *mode;
 596         struct sk_buff *skb;
 597         struct ieee80211_mgmt *mgmt;
 598         u8 *pos, *ies;
 599         int i, len;
 600         u16 capab;
 601         struct ieee80211_sta_bss *bss;
 602         int wmm = 0;
 603
 604         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 605                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 606                             ifsta->ssid_len);
 607         if (!skb) {
 608                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 609                        "frame\n", dev->name);
 610                 return;
 611         }
 612         skb_reserve(skb, local->hw.extra_tx_headroom);
 613
 614         mode = local->oper_hw_mode;
 615         capab = ifsta->capab;
 616         if (mode->mode == MODE_IEEE80211G) {
 617                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
 618                         WLAN_CAPABILITY_SHORT_PREAMBLE;
 619         }
 620         bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
 621                                    ifsta->ssid, ifsta->ssid_len);
 622         if (bss) {
 623                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 624                         capab |= WLAN_CAPABILITY_PRIVACY;
 625                 if (bss->wmm_ie) {
 626                         wmm = 1;
 627                 }
 628                 ieee80211_rx_bss_put(dev, bss);
 629         }
 630
 631         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 632         memset(mgmt, 0, 24);
 633         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 634         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 635         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 636
 637         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 638                 skb_put(skb, 10);
 639                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 640                                                    IEEE80211_STYPE_REASSOC_REQ);
 641                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 642                 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
 643                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 644                        ETH_ALEN);
 645         } else {
 646                 skb_put(skb, 4);
 647                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 648                                                    IEEE80211_STYPE_ASSOC_REQ);
 649                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 650                 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
 651         }
 652
 653         /* SSID */
 654         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 655         *pos++ = WLAN_EID_SSID;
 656         *pos++ = ifsta->ssid_len;
 657         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 658
 659         len = mode->num_rates;
 660         if (len > 8)
 661                 len = 8;
 662         pos = skb_put(skb, len + 2);
 663         *pos++ = WLAN_EID_SUPP_RATES;
 664         *pos++ = len;
 665         for (i = 0; i < len; i++) {
 666                 int rate = mode->rates[i].rate;
 667                 *pos++ = (u8) (rate / 5);
 668         }
 669
 670         if (mode->num_rates > len) {
 671                 pos = skb_put(skb, mode->num_rates - len + 2);
 672                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 673                 *pos++ = mode->num_rates - len;
 674                 for (i = len; i < mode->num_rates; i++) {
 675                         int rate = mode->rates[i].rate;
 676                         *pos++ = (u8) (rate / 5);
 677                 }
 678         }
 679
 680         if (ifsta->extra_ie) {
 681                 pos = skb_put(skb, ifsta->extra_ie_len);
 682                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 683         }
 684
 685         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 686                 pos = skb_put(skb, 9);
 687                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 688                 *pos++ = 7; /* len */
 689                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 690                 *pos++ = 0x50;
 691                 *pos++ = 0xf2;
 692                 *pos++ = 2; /* WME */
 693                 *pos++ = 0; /* WME info */
 694                 *pos++ = 1; /* WME ver */
 695                 *pos++ = 0;
 696         }
 697         /* wmm support is a must to HT */
 698         if (wmm && mode->ht_info.ht_supported) {
 699                 __le16 tmp = cpu_to_le16(mode->ht_info.cap);
 700                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 701                 *pos++ = WLAN_EID_HT_CAPABILITY;
 702                 *pos++ = sizeof(struct ieee80211_ht_cap);
 703                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 704                 memcpy(pos, &tmp, sizeof(u16));
 705                 pos += sizeof(u16);
 706                 *pos++ = (mode->ht_info.ampdu_factor |
 707                                 (mode->ht_info.ampdu_density << 2));
 708                 memcpy(pos, mode->ht_info.supp_mcs_set, 16);
 709         }
 710
 711         kfree(ifsta->assocreq_ies);
 712         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 713         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 714         if (ifsta->assocreq_ies)
 715                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 716
 717         ieee80211_sta_tx(dev, skb, 0);
 718 }
 719
 720
 721 static void ieee80211_send_deauth(struct net_device *dev,
 722                                   struct ieee80211_if_sta *ifsta, u16 reason)
 723 {
 724         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 725         struct sk_buff *skb;
 726         struct ieee80211_mgmt *mgmt;
 727
 728         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 729         if (!skb) {
 730                 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
 731                        "frame\n", dev->name);
 732                 return;
 733         }
 734         skb_reserve(skb, local->hw.extra_tx_headroom);
 735
 736         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 737         memset(mgmt, 0, 24);
 738         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 739         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 740         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 741         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 742                                            IEEE80211_STYPE_DEAUTH);
 743         skb_put(skb, 2);
 744         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 745
 746         ieee80211_sta_tx(dev, skb, 0);
 747 }
 748
 749
 750 static void ieee80211_send_disassoc(struct net_device *dev,
 751                                     struct ieee80211_if_sta *ifsta, u16 reason)
 752 {
 753         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 754         struct sk_buff *skb;
 755         struct ieee80211_mgmt *mgmt;
 756
 757         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 758         if (!skb) {
 759                 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
 760                        "frame\n", dev->name);
 761                 return;
 762         }
 763         skb_reserve(skb, local->hw.extra_tx_headroom);
 764
 765         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 766         memset(mgmt, 0, 24);
 767         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 768         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 769         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 770         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 771                                            IEEE80211_STYPE_DISASSOC);
 772         skb_put(skb, 2);
 773         mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
 774
 775         ieee80211_sta_tx(dev, skb, 0);
 776 }
 777
 778
 779 static int ieee80211_privacy_mismatch(struct net_device *dev,
 780                                       struct ieee80211_if_sta *ifsta)
 781 {
 782         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 783         struct ieee80211_sta_bss *bss;
 784         int bss_privacy;
 785         int wep_privacy;
 786         int privacy_invoked;
 787
 788         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
 789                 return 0;
 790
 791         bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
 792                                    ifsta->ssid, ifsta->ssid_len);
 793         if (!bss)
 794                 return 0;
 795
 796         bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
 797         wep_privacy = !!ieee80211_sta_wep_configured(dev);
 798         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
 799
 800         ieee80211_rx_bss_put(dev, bss);
 801
 802         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 803                 return 0;
 804
 805         return 1;
 806 }
 807
 808
 809 static void ieee80211_associate(struct net_device *dev,
 810                                 struct ieee80211_if_sta *ifsta)
 811 {
 812         DECLARE_MAC_BUF(mac);
 813
 814         ifsta->assoc_tries++;
 815         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 816                 printk(KERN_DEBUG "%s: association with AP %s"
 817                        " timed out\n",
 818                        dev->name, print_mac(mac, ifsta->bssid));
 819                 ifsta->state = IEEE80211_DISABLED;
 820                 return;
 821         }
 822
 823         ifsta->state = IEEE80211_ASSOCIATE;
 824         printk(KERN_DEBUG "%s: associate with AP %s\n",
 825                dev->name, print_mac(mac, ifsta->bssid));
 826         if (ieee80211_privacy_mismatch(dev, ifsta)) {
 827                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 828                        "mixed-cell disabled - abort association\n", dev->name);
 829                 ifsta->state = IEEE80211_DISABLED;
 830                 return;
 831         }
 832
 833         ieee80211_send_assoc(dev, ifsta);
 834
 835         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 836 }
 837
 838
 839 static void ieee80211_associated(struct net_device *dev,
 840                                  struct ieee80211_if_sta *ifsta)
 841 {
 842         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 843         struct sta_info *sta;
 844         int disassoc;
 845         DECLARE_MAC_BUF(mac);
 846
 847         /* TODO: start monitoring current AP signal quality and number of
 848          * missed beacons. Scan other channels every now and then and search
 849          * for better APs. */
 850         /* TODO: remove expired BSSes */
 851
 852         ifsta->state = IEEE80211_ASSOCIATED;
 853
 854         sta = sta_info_get(local, ifsta->bssid);
 855         if (!sta) {
 856                 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
 857                        dev->name, print_mac(mac, ifsta->bssid));
 858                 disassoc = 1;
 859         } else {
 860                 disassoc = 0;
 861                 if (time_after(jiffies,
 862                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 863                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
 864                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 865                                        "current AP %s - assume out of "
 866                                        "range\n",
 867                                        dev->name, print_mac(mac, ifsta->bssid));
 868                                 disassoc = 1;
 869                                 sta_info_free(sta);
 870                         } else
 871                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 872                                                          local->scan_ssid,
 873                                                          local->scan_ssid_len);
 874                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 875                 } else {
 876                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 877                         if (time_after(jiffies, ifsta->last_probe +
 878                                        IEEE80211_PROBE_INTERVAL)) {
 879                                 ifsta->last_probe = jiffies;
 880                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 881                                                          ifsta->ssid,
 882                                                          ifsta->ssid_len);
 883                         }
 884                 }
 885                 sta_info_put(sta);
 886         }
 887         if (disassoc) {
 888                 ifsta->state = IEEE80211_DISABLED;
 889                 ieee80211_set_associated(dev, ifsta, 0);
 890         } else {
 891                 mod_timer(&ifsta->timer, jiffies +
 892                                       IEEE80211_MONITORING_INTERVAL);
 893         }
 894 }
 895
 896
 897 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
 898                                      u8 *ssid, size_t ssid_len)
 899 {
 900         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 901         struct ieee80211_hw_mode *mode;
 902         struct sk_buff *skb;
 903         struct ieee80211_mgmt *mgmt;
 904         u8 *pos, *supp_rates, *esupp_rates = NULL;
 905         int i;
 906
 907         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 908         if (!skb) {
 909                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 910                        "request\n", dev->name);
 911                 return;
 912         }
 913         skb_reserve(skb, local->hw.extra_tx_headroom);
 914
 915         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 916         memset(mgmt, 0, 24);
 917         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 918                                            IEEE80211_STYPE_PROBE_REQ);
 919         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 920         if (dst) {
 921                 memcpy(mgmt->da, dst, ETH_ALEN);
 922                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 923         } else {
 924                 memset(mgmt->da, 0xff, ETH_ALEN);
 925                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 926         }
 927         pos = skb_put(skb, 2 + ssid_len);
 928         *pos++ = WLAN_EID_SSID;
 929         *pos++ = ssid_len;
 930         memcpy(pos, ssid, ssid_len);
 931
 932         supp_rates = skb_put(skb, 2);
 933         supp_rates[0] = WLAN_EID_SUPP_RATES;
 934         supp_rates[1] = 0;
 935         mode = local->oper_hw_mode;
 936         for (i = 0; i < mode->num_rates; i++) {
 937                 struct ieee80211_rate *rate = &mode->rates[i];
 938                 if (!(rate->flags & IEEE80211_RATE_SUPPORTED))
 939                         continue;
 940                 if (esupp_rates) {
 941                         pos = skb_put(skb, 1);
 942                         esupp_rates[1]++;
 943                 } else if (supp_rates[1] == 8) {
 944                         esupp_rates = skb_put(skb, 3);
 945                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 946                         esupp_rates[1] = 1;
 947                         pos = &esupp_rates[2];
 948                 } else {
 949                         pos = skb_put(skb, 1);
 950                         supp_rates[1]++;
 951                 }
 952                 *pos = rate->rate / 5;
 953         }
 954
 955         ieee80211_sta_tx(dev, skb, 0);
 956 }
 957
 958
 959 static int ieee80211_sta_wep_configured(struct net_device *dev)
 960 {
 961         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 962         if (!sdata || !sdata->default_key ||
 963             sdata->default_key->conf.alg != ALG_WEP)
 964                 return 0;
 965         return 1;
 966 }
 967
 968
 969 static void ieee80211_auth_completed(struct net_device *dev,
 970                                      struct ieee80211_if_sta *ifsta)
 971 {
 972         printk(KERN_DEBUG "%s: authenticated\n", dev->name);
 973         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
 974         ieee80211_associate(dev, ifsta);
 975 }
 976
 977
 978 static void ieee80211_auth_challenge(struct net_device *dev,
 979                                      struct ieee80211_if_sta *ifsta,
 980                                      struct ieee80211_mgmt *mgmt,
 981                                      size_t len)
 982 {
 983         u8 *pos;
 984         struct ieee802_11_elems elems;
 985
 986         printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
 987         pos = mgmt->u.auth.variable;
 988         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 989         if (!elems.challenge) {
 990                 printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
 991                        "frame\n", dev->name);
 992                 return;
 993         }
 994         ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
 995                             elems.challenge_len + 2, 1);
 996 }
 997
 998 static void ieee80211_send_addba_resp(struct net_device *dev, u8 *da, u16 tid,
 999                                         u8 dialog_token, u16 status, u16 policy,
1000                                         u16 buf_size, u16 timeout)
1001 {
1002         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1003         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1004         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1005         struct sk_buff *skb;
1006         struct ieee80211_mgmt *mgmt;
1007         u16 capab;
1008
1009         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom + 1 +
1010                                         sizeof(mgmt->u.action.u.addba_resp));
1011         if (!skb) {
1012                 printk(KERN_DEBUG "%s: failed to allocate buffer "
1013                        "for addba resp frame\n", dev->name);
1014                 return;
1015         }
1016
1017         skb_reserve(skb, local->hw.extra_tx_headroom);
1018         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1019         memset(mgmt, 0, 24);
1020         memcpy(mgmt->da, da, ETH_ALEN);
1021         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1022         if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1023                 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1024         else
1025                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1026         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1027                                            IEEE80211_STYPE_ACTION);
1028
1029         skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
1030         mgmt->u.action.category = WLAN_CATEGORY_BACK;
1031         mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
1032         mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
1033
1034         capab = (u16)(policy << 1);     /* bit 1 aggregation policy */
1035         capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
1036         capab |= (u16)(buf_size << 6);  /* bit 15:6 max size of aggregation */
1037
1038         mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
1039         mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
1040         mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
1041
1042         ieee80211_sta_tx(dev, skb, 0);
1043
1044         return;
1045 }
1046
1047 static void ieee80211_sta_process_addba_request(struct net_device *dev,
1048                                                 struct ieee80211_mgmt *mgmt,
1049                                                 size_t len)
1050 {
1051         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1052         struct ieee80211_hw *hw = &local->hw;
1053         struct ieee80211_conf *conf = &hw->conf;
1054         struct sta_info *sta;
1055         struct tid_ampdu_rx *tid_agg_rx;
1056         u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1057         u8 dialog_token;
1058         int ret = -EOPNOTSUPP;
1059         DECLARE_MAC_BUF(mac);
1060
1061         sta = sta_info_get(local, mgmt->sa);
1062         if (!sta)
1063                 return;
1064
1065         /* extract session parameters from addba request frame */
1066         dialog_token = mgmt->u.action.u.addba_req.dialog_token;
1067         timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1068         start_seq_num =
1069                 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1070
1071         capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
1072         ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
1073         tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
1074         buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
1075
1076         status = WLAN_STATUS_REQUEST_DECLINED;
1077
1078         /* sanity check for incoming parameters:
1079          * check if configuration can support the BA policy
1080          * and if buffer size does not exceeds max value */
1081         if (((ba_policy != 1)
1082                 && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
1083                 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
1084                 status = WLAN_STATUS_INVALID_QOS_PARAM;
1085 #ifdef CONFIG_MAC80211_HT_DEBUG
1086                 if (net_ratelimit())
1087                         printk(KERN_DEBUG "Block Ack Req with bad params from "
1088                                 "%s on tid %u. policy %d, buffer size %d\n",
1089                                 print_mac(mac, mgmt->sa), tid, ba_policy,
1090                                 buf_size);
1091 #endif /* CONFIG_MAC80211_HT_DEBUG */
1092                 goto end_no_lock;
1093         }
1094         /* determine default buffer size */
1095         if (buf_size == 0) {
1096                 struct ieee80211_hw_mode *mode = conf->mode;
1097                 buf_size = IEEE80211_MIN_AMPDU_BUF;
1098                 buf_size = buf_size << mode->ht_info.ampdu_factor;
1099         }
1100
1101         tid_agg_rx = &sta->ampdu_mlme.tid_rx[tid];
1102
1103         /* examine state machine */
1104         spin_lock_bh(&sta->ampdu_mlme.ampdu_rx);
1105
1106         if (tid_agg_rx->state != HT_AGG_STATE_IDLE) {
1107 #ifdef CONFIG_MAC80211_HT_DEBUG
1108                 if (net_ratelimit())
1109                         printk(KERN_DEBUG "unexpected Block Ack Req from "
1110                                 "%s on tid %u\n",
1111                                 print_mac(mac, mgmt->sa), tid);
1112 #endif /* CONFIG_MAC80211_HT_DEBUG */
1113                 goto end;
1114         }
1115
1116         /* prepare reordering buffer */
1117         tid_agg_rx->reorder_buf =
1118                 kmalloc(buf_size * sizeof(struct sk_buf *), GFP_ATOMIC);
1119         if ((!tid_agg_rx->reorder_buf) && net_ratelimit()) {
1120                 printk(KERN_ERR "can not allocate reordering buffer "
1121                                                 "to tid %d\n", tid);
1122                 goto end;
1123         }
1124         memset(tid_agg_rx->reorder_buf, 0,
1125                 buf_size * sizeof(struct sk_buf *));
1126
1127         if (local->ops->ampdu_action)
1128                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1129                                                sta->addr, tid, start_seq_num);
1130 #ifdef CONFIG_MAC80211_HT_DEBUG
1131         printk(KERN_DEBUG "Rx A-MPDU on tid %d result %d", tid, ret);
1132 #endif /* CONFIG_MAC80211_HT_DEBUG */
1133
1134         if (ret) {
1135                 kfree(tid_agg_rx->reorder_buf);
1136                 goto end;
1137         }
1138
1139         /* change state and send addba resp */
1140         tid_agg_rx->state = HT_AGG_STATE_OPERATIONAL;
1141         tid_agg_rx->dialog_token = dialog_token;
1142         tid_agg_rx->ssn = start_seq_num;
1143         tid_agg_rx->head_seq_num = start_seq_num;
1144         tid_agg_rx->buf_size = buf_size;
1145         tid_agg_rx->timeout = timeout;
1146         tid_agg_rx->stored_mpdu_num = 0;
1147         status = WLAN_STATUS_SUCCESS;
1148 end:
1149         spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);
1150
1151 end_no_lock:
1152         ieee80211_send_addba_resp(sta->dev, sta->addr, tid, dialog_token,
1153                                 status, 1, buf_size, timeout);
1154         sta_info_put(sta);
1155 }
1156
1157 static void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
1158                                  u16 initiator, u16 reason_code)
1159 {
1160         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1161         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1162         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1163         struct sk_buff *skb;
1164         struct ieee80211_mgmt *mgmt;
1165         u16 params;
1166
1167         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom + 1 +
1168                                         sizeof(mgmt->u.action.u.delba));
1169
1170         if (!skb) {
1171                 printk(KERN_ERR "%s: failed to allocate buffer "
1172                                         "for delba frame\n", dev->name);
1173                 return;
1174         }
1175
1176         skb_reserve(skb, local->hw.extra_tx_headroom);
1177         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
1178         memset(mgmt, 0, 24);
1179         memcpy(mgmt->da, da, ETH_ALEN);
1180         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1181         if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1182                 memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
1183         else
1184                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
1185         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
1186                                         IEEE80211_STYPE_ACTION);
1187
1188         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
1189
1190         mgmt->u.action.category = WLAN_CATEGORY_BACK;
1191         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
1192         params = (u16)(initiator << 11);        /* bit 11 initiator */
1193         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
1194
1195         mgmt->u.action.u.delba.params = cpu_to_le16(params);
1196         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
1197
1198         ieee80211_sta_tx(dev, skb, 0);
1199 }
1200
1201 void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid,
1202                                         u16 initiator, u16 reason)
1203 {
1204         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1205         struct ieee80211_hw *hw = &local->hw;
1206         struct sta_info *sta;
1207         int ret, i;
1208
1209         sta = sta_info_get(local, ra);
1210         if (!sta)
1211                 return;
1212
1213         /* check if TID is in operational state */
1214         spin_lock_bh(&sta->ampdu_mlme.ampdu_rx);
1215         if (sta->ampdu_mlme.tid_rx[tid].state
1216                                 != HT_AGG_STATE_OPERATIONAL) {
1217                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);
1218                 sta_info_put(sta);
1219                 return;
1220         }
1221         sta->ampdu_mlme.tid_rx[tid].state =
1222                 HT_AGG_STATE_REQ_STOP_BA_MSK |
1223                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
1224                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);
1225
1226         /* stop HW Rx aggregation. ampdu_action existence
1227          * already verified in session init so we add the BUG_ON */
1228         BUG_ON(!local->ops->ampdu_action);
1229
1230         ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
1231                                         ra, tid, EINVAL);
1232         if (ret)
1233                 printk(KERN_DEBUG "HW problem - can not stop rx "
1234                                 "aggergation for tid %d\n", tid);
1235
1236         /* shutdown timer has not expired */
1237         if (initiator != WLAN_BACK_TIMER)
1238                 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid].
1239                                         session_timer);
1240
1241         /* check if this is a self generated aggregation halt */
1242         if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
1243                 ieee80211_send_delba(dev, ra, tid, 0, reason);
1244
1245         /* free the reordering buffer */
1246         for (i = 0; i < sta->ampdu_mlme.tid_rx[tid].buf_size; i++) {
1247                 if (sta->ampdu_mlme.tid_rx[tid].reorder_buf[i]) {
1248                         /* release the reordered frames */
1249                         dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid].reorder_buf[i]);
1250                         sta->ampdu_mlme.tid_rx[tid].stored_mpdu_num--;
1251                         sta->ampdu_mlme.tid_rx[tid].reorder_buf[i] = NULL;
1252                 }
1253         }
1254         kfree(sta->ampdu_mlme.tid_rx[tid].reorder_buf);
1255
1256         sta->ampdu_mlme.tid_rx[tid].state = HT_AGG_STATE_IDLE;
1257         sta_info_put(sta);
1258 }
1259
1260 static void ieee80211_sta_process_delba(struct net_device *dev,
1261                         struct ieee80211_mgmt *mgmt, size_t len)
1262 {
1263         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1264         struct sta_info *sta;
1265         u16 tid, params;
1266         u16 initiator;
1267         DECLARE_MAC_BUF(mac);
1268
1269         sta = sta_info_get(local, mgmt->sa);
1270         if (!sta)
1271                 return;
1272
1273         params = le16_to_cpu(mgmt->u.action.u.delba.params);
1274         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
1275         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
1276
1277 #ifdef CONFIG_MAC80211_HT_DEBUG
1278         if (net_ratelimit())
1279                 printk(KERN_DEBUG "delba from %s on tid %d reason code %d\n",
1280                         print_mac(mac, mgmt->sa), tid,
1281                         mgmt->u.action.u.delba.reason_code);
1282 #endif /* CONFIG_MAC80211_HT_DEBUG */
1283
1284         if (initiator == WLAN_BACK_INITIATOR)
1285                 ieee80211_sta_stop_rx_ba_session(dev, sta->addr, tid,
1286                                                  WLAN_BACK_INITIATOR, 0);
1287         sta_info_put(sta);
1288 }
1289
1290 /*
1291  * After receiving Block Ack Request (BAR) we activated a
1292  * timer after each frame arrives from the originator.
1293  * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
1294  */
1295 void sta_rx_agg_session_timer_expired(unsigned long data)
1296 {
1297         /* not an elegant detour, but there is no choice as the timer passes
1298          * only one argument, and verious sta_info are needed here, so init
1299          * flow in sta_info_add gives the TID as data, while the timer_to_id
1300          * array gives the sta through container_of */
1301         u8 *ptid = (u8 *)data;
1302         u8 *timer_to_id = ptid - *ptid;
1303         struct sta_info *sta = container_of(timer_to_id, struct sta_info,
1304                                          timer_to_tid[0]);
1305
1306         printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
1307         ieee80211_sta_stop_rx_ba_session(sta->dev, sta->addr, (u16)*ptid,
1308                                          WLAN_BACK_TIMER,
1309                                          WLAN_REASON_QSTA_TIMEOUT);
1310 }
1311
1312
1313 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
1314                                    struct ieee80211_if_sta *ifsta,
1315                                    struct ieee80211_mgmt *mgmt,
1316                                    size_t len)
1317 {
1318         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1319         u16 auth_alg, auth_transaction, status_code;
1320         DECLARE_MAC_BUF(mac);
1321
1322         if (ifsta->state != IEEE80211_AUTHENTICATE &&
1323             sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
1324                 printk(KERN_DEBUG "%s: authentication frame received from "
1325                        "%s, but not in authenticate state - ignored\n",
1326                        dev->name, print_mac(mac, mgmt->sa));
1327                 return;
1328         }
1329
1330         if (len < 24 + 6) {
1331                 printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
1332                        "received from %s - ignored\n",
1333                        dev->name, len, print_mac(mac, mgmt->sa));
1334                 return;
1335         }
1336
1337         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1338             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1339                 printk(KERN_DEBUG "%s: authentication frame received from "
1340                        "unknown AP (SA=%s BSSID=%s) - "
1341                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1342                        print_mac(mac, mgmt->bssid));
1343                 return;
1344         }
1345
1346         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
1347             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
1348                 printk(KERN_DEBUG "%s: authentication frame received from "
1349                        "unknown BSSID (SA=%s BSSID=%s) - "
1350                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1351                        print_mac(mac, mgmt->bssid));
1352                 return;
1353         }
1354
1355         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1356         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1357         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1358
1359         printk(KERN_DEBUG "%s: RX authentication from %s (alg=%d "
1360                "transaction=%d status=%d)\n",
1361                dev->name, print_mac(mac, mgmt->sa), auth_alg,
1362                auth_transaction, status_code);
1363
1364         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1365                 /* IEEE 802.11 standard does not require authentication in IBSS
1366                  * networks and most implementations do not seem to use it.
1367                  * However, try to reply to authentication attempts if someone
1368                  * has actually implemented this.
1369                  * TODO: Could implement shared key authentication. */
1370                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
1371                         printk(KERN_DEBUG "%s: unexpected IBSS authentication "
1372                                "frame (alg=%d transaction=%d)\n",
1373                                dev->name, auth_alg, auth_transaction);
1374                         return;
1375                 }
1376                 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
1377         }
1378
1379         if (auth_alg != ifsta->auth_alg ||
1380             auth_transaction != ifsta->auth_transaction) {
1381                 printk(KERN_DEBUG "%s: unexpected authentication frame "
1382                        "(alg=%d transaction=%d)\n",
1383                        dev->name, auth_alg, auth_transaction);
1384                 return;
1385         }
1386
1387         if (status_code != WLAN_STATUS_SUCCESS) {
1388                 printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
1389                        "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
1390                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1391                         u8 algs[3];
1392                         const int num_algs = ARRAY_SIZE(algs);
1393                         int i, pos;
1394                         algs[0] = algs[1] = algs[2] = 0xff;
1395                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1396                                 algs[0] = WLAN_AUTH_OPEN;
1397                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1398                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1399                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1400                                 algs[2] = WLAN_AUTH_LEAP;
1401                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1402                                 pos = 0;
1403                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1404                                 pos = 1;
1405                         else
1406                                 pos = 2;
1407                         for (i = 0; i < num_algs; i++) {
1408                                 pos++;
1409                                 if (pos >= num_algs)
1410                                         pos = 0;
1411                                 if (algs[pos] == ifsta->auth_alg ||
1412                                     algs[pos] == 0xff)
1413                                         continue;
1414                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1415                                     !ieee80211_sta_wep_configured(dev))
1416                                         continue;
1417                                 ifsta->auth_alg = algs[pos];
1418                                 printk(KERN_DEBUG "%s: set auth_alg=%d for "
1419                                        "next try\n",
1420                                        dev->name, ifsta->auth_alg);
1421                                 break;
1422                         }
1423                 }
1424                 return;
1425         }
1426
1427         switch (ifsta->auth_alg) {
1428         case WLAN_AUTH_OPEN:
1429         case WLAN_AUTH_LEAP:
1430                 ieee80211_auth_completed(dev, ifsta);
1431                 break;
1432         case WLAN_AUTH_SHARED_KEY:
1433                 if (ifsta->auth_transaction == 4)
1434                         ieee80211_auth_completed(dev, ifsta);
1435                 else
1436                         ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1437                 break;
1438         }
1439 }
1440
1441
1442 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1443                                      struct ieee80211_if_sta *ifsta,
1444                                      struct ieee80211_mgmt *mgmt,
1445                                      size_t len)
1446 {
1447         u16 reason_code;
1448         DECLARE_MAC_BUF(mac);
1449
1450         if (len < 24 + 2) {
1451                 printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
1452                        "received from %s - ignored\n",
1453                        dev->name, len, print_mac(mac, mgmt->sa));
1454                 return;
1455         }
1456
1457         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1458                 printk(KERN_DEBUG "%s: deauthentication frame received from "
1459                        "unknown AP (SA=%s BSSID=%s) - "
1460                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1461                        print_mac(mac, mgmt->bssid));
1462                 return;
1463         }
1464
1465         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1466
1467         printk(KERN_DEBUG "%s: RX deauthentication from %s"
1468                " (reason=%d)\n",
1469                dev->name, print_mac(mac, mgmt->sa), reason_code);
1470
1471         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED) {
1472                 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1473         }
1474
1475         if (ifsta->state == IEEE80211_AUTHENTICATE ||
1476             ifsta->state == IEEE80211_ASSOCIATE ||
1477             ifsta->state == IEEE80211_ASSOCIATED) {
1478                 ifsta->state = IEEE80211_AUTHENTICATE;
1479                 mod_timer(&ifsta->timer, jiffies +
1480                                       IEEE80211_RETRY_AUTH_INTERVAL);
1481         }
1482
1483         ieee80211_set_disassoc(dev, ifsta, 1);
1484         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1485 }
1486
1487
1488 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1489                                        struct ieee80211_if_sta *ifsta,
1490                                        struct ieee80211_mgmt *mgmt,
1491                                        size_t len)
1492 {
1493         u16 reason_code;
1494         DECLARE_MAC_BUF(mac);
1495
1496         if (len < 24 + 2) {
1497                 printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1498                        "received from %s - ignored\n",
1499                        dev->name, len, print_mac(mac, mgmt->sa));
1500                 return;
1501         }
1502
1503         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1504                 printk(KERN_DEBUG "%s: disassociation frame received from "
1505                        "unknown AP (SA=%s BSSID=%s) - "
1506                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1507                        print_mac(mac, mgmt->bssid));
1508                 return;
1509         }
1510
1511         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1512
1513         printk(KERN_DEBUG "%s: RX disassociation from %s"
1514                " (reason=%d)\n",
1515                dev->name, print_mac(mac, mgmt->sa), reason_code);
1516
1517         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1518                 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1519
1520         if (ifsta->state == IEEE80211_ASSOCIATED) {
1521                 ifsta->state = IEEE80211_ASSOCIATE;
1522                 mod_timer(&ifsta->timer, jiffies +
1523                                       IEEE80211_RETRY_AUTH_INTERVAL);
1524         }
1525
1526         ieee80211_set_disassoc(dev, ifsta, 0);
1527 }
1528
1529
1530 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1531                                          struct ieee80211_if_sta *ifsta,
1532                                          struct ieee80211_mgmt *mgmt,
1533                                          size_t len,
1534                                          int reassoc)
1535 {
1536         struct ieee80211_local *local = sdata->local;
1537         struct net_device *dev = sdata->dev;
1538         struct ieee80211_hw_mode *mode;
1539         struct sta_info *sta;
1540         u32 rates;
1541         u16 capab_info, status_code, aid;
1542         struct ieee802_11_elems elems;
1543         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1544         u8 *pos;
1545         int i, j;
1546         DECLARE_MAC_BUF(mac);
1547
1548         /* AssocResp and ReassocResp have identical structure, so process both
1549          * of them in this function. */
1550
1551         if (ifsta->state != IEEE80211_ASSOCIATE) {
1552                 printk(KERN_DEBUG "%s: association frame received from "
1553                        "%s, but not in associate state - ignored\n",
1554                        dev->name, print_mac(mac, mgmt->sa));
1555                 return;
1556         }
1557
1558         if (len < 24 + 6) {
1559                 printk(KERN_DEBUG "%s: too short (%zd) association frame "
1560                        "received from %s - ignored\n",
1561                        dev->name, len, print_mac(mac, mgmt->sa));
1562                 return;
1563         }
1564
1565         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1566                 printk(KERN_DEBUG "%s: association frame received from "
1567                        "unknown AP (SA=%s BSSID=%s) - "
1568                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1569                        print_mac(mac, mgmt->bssid));
1570                 return;
1571         }
1572
1573         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1574         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1575         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1576
1577         printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1578                "status=%d aid=%d)\n",
1579                dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1580                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1581
1582         if (status_code != WLAN_STATUS_SUCCESS) {
1583                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1584                        dev->name, status_code);
1585                 /* if this was a reassociation, ensure we try a "full"
1586                  * association next time. This works around some broken APs
1587                  * which do not correctly reject reassociation requests. */
1588                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1589                 return;
1590         }
1591
1592         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1593                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1594                        "set\n", dev->name, aid);
1595         aid &= ~(BIT(15) | BIT(14));
1596
1597         pos = mgmt->u.assoc_resp.variable;
1598         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1599
1600         if (!elems.supp_rates) {
1601                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1602                        dev->name);
1603                 return;
1604         }
1605
1606         printk(KERN_DEBUG "%s: associated\n", dev->name);
1607         ifsta->aid = aid;
1608         ifsta->ap_capab = capab_info;
1609
1610         kfree(ifsta->assocresp_ies);
1611         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1612         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1613         if (ifsta->assocresp_ies)
1614                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1615
1616         /* set AID, ieee80211_set_associated() will tell the driver */
1617         bss_conf->aid = aid;
1618         ieee80211_set_associated(dev, ifsta, 1);
1619
1620         /* Add STA entry for the AP */
1621         sta = sta_info_get(local, ifsta->bssid);
1622         if (!sta) {
1623                 struct ieee80211_sta_bss *bss;
1624                 sta = sta_info_add(local, dev, ifsta->bssid, GFP_KERNEL);
1625                 if (!sta) {
1626                         printk(KERN_DEBUG "%s: failed to add STA entry for the"
1627                                " AP\n", dev->name);
1628                         return;
1629                 }
1630                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
1631                                            local->hw.conf.channel,
1632                                            ifsta->ssid, ifsta->ssid_len);
1633                 if (bss) {
1634                         sta->last_rssi = bss->rssi;
1635                         sta->last_signal = bss->signal;
1636                         sta->last_noise = bss->noise;
1637                         ieee80211_rx_bss_put(dev, bss);
1638                 }
1639         }
1640
1641         sta->dev = dev;
1642         sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP;
1643
1644         rates = 0;
1645         mode = local->oper_hw_mode;
1646         for (i = 0; i < elems.supp_rates_len; i++) {
1647                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1648                 for (j = 0; j < mode->num_rates; j++)
1649                         if (mode->rates[j].rate == rate)
1650                                 rates |= BIT(j);
1651         }
1652         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1653                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1654                 for (j = 0; j < mode->num_rates; j++)
1655                         if (mode->rates[j].rate == rate)
1656                                 rates |= BIT(j);
1657         }
1658         sta->supp_rates = rates;
1659
1660         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1661             local->ops->conf_ht) {
1662                 struct ieee80211_ht_bss_info bss_info;
1663
1664                 ieee80211_ht_cap_ie_to_ht_info(
1665                                 (struct ieee80211_ht_cap *)
1666                                 elems.ht_cap_elem, &sta->ht_info);
1667                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
1668                                 (struct ieee80211_ht_addt_info *)
1669                                 elems.ht_info_elem, &bss_info);
1670                 ieee80211_hw_config_ht(local, 1, &sta->ht_info, &bss_info);
1671         }
1672
1673         rate_control_rate_init(sta, local);
1674
1675         if (elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1676                 sta->flags |= WLAN_STA_WME;
1677                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1678                                          elems.wmm_param_len);
1679         }
1680
1681
1682         sta_info_put(sta);
1683
1684         ieee80211_associated(dev, ifsta);
1685 }
1686
1687
1688 /* Caller must hold local->sta_bss_lock */
1689 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
1690                                         struct ieee80211_sta_bss *bss)
1691 {
1692         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1693         bss->hnext = local->sta_bss_hash[STA_HASH(bss->bssid)];
1694         local->sta_bss_hash[STA_HASH(bss->bssid)] = bss;
1695 }
1696
1697
1698 /* Caller must hold local->sta_bss_lock */
1699 static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
1700                                         struct ieee80211_sta_bss *bss)
1701 {
1702         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1703         struct ieee80211_sta_bss *b, *prev = NULL;
1704         b = local->sta_bss_hash[STA_HASH(bss->bssid)];
1705         while (b) {
1706                 if (b == bss) {
1707                         if (!prev)
1708                                 local->sta_bss_hash[STA_HASH(bss->bssid)] =
1709                                         bss->hnext;
1710                         else
1711                                 prev->hnext = bss->hnext;
1712                         break;
1713                 }
1714                 prev = b;
1715                 b = b->hnext;
1716         }
1717 }
1718
1719
1720 static struct ieee80211_sta_bss *
1721 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel,
1722                      u8 *ssid, u8 ssid_len)
1723 {
1724         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1725         struct ieee80211_sta_bss *bss;
1726
1727         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
1728         if (!bss)
1729                 return NULL;
1730         atomic_inc(&bss->users);
1731         atomic_inc(&bss->users);
1732         memcpy(bss->bssid, bssid, ETH_ALEN);
1733         bss->channel = channel;
1734         if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
1735                 memcpy(bss->ssid, ssid, ssid_len);
1736                 bss->ssid_len = ssid_len;
1737         }
1738
1739         spin_lock_bh(&local->sta_bss_lock);
1740         /* TODO: order by RSSI? */
1741         list_add_tail(&bss->list, &local->sta_bss_list);
1742         __ieee80211_rx_bss_hash_add(dev, bss);
1743         spin_unlock_bh(&local->sta_bss_lock);
1744         return bss;
1745 }
1746
1747
1748 static struct ieee80211_sta_bss *
1749 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
1750                      u8 *ssid, u8 ssid_len)
1751 {
1752         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1753         struct ieee80211_sta_bss *bss;
1754
1755         spin_lock_bh(&local->sta_bss_lock);
1756         bss = local->sta_bss_hash[STA_HASH(bssid)];
1757         while (bss) {
1758                 if (!memcmp(bss->bssid, bssid, ETH_ALEN) &&
1759                     bss->channel == channel &&
1760                     bss->ssid_len == ssid_len &&
1761                     (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
1762                         atomic_inc(&bss->users);
1763                         break;
1764                 }
1765                 bss = bss->hnext;
1766         }
1767         spin_unlock_bh(&local->sta_bss_lock);
1768         return bss;
1769 }
1770
1771
1772 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
1773 {
1774         kfree(bss->wpa_ie);
1775         kfree(bss->rsn_ie);
1776         kfree(bss->wmm_ie);
1777         kfree(bss->ht_ie);
1778         kfree(bss);
1779 }
1780
1781
1782 static void ieee80211_rx_bss_put(struct net_device *dev,
1783                                  struct ieee80211_sta_bss *bss)
1784 {
1785         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1786         if (!atomic_dec_and_test(&bss->users))
1787                 return;
1788
1789         spin_lock_bh(&local->sta_bss_lock);
1790         __ieee80211_rx_bss_hash_del(dev, bss);
1791         list_del(&bss->list);
1792         spin_unlock_bh(&local->sta_bss_lock);
1793         ieee80211_rx_bss_free(bss);
1794 }
1795
1796
1797 void ieee80211_rx_bss_list_init(struct net_device *dev)
1798 {
1799         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1800         spin_lock_init(&local->sta_bss_lock);
1801         INIT_LIST_HEAD(&local->sta_bss_list);
1802 }
1803
1804
1805 void ieee80211_rx_bss_list_deinit(struct net_device *dev)
1806 {
1807         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1808         struct ieee80211_sta_bss *bss, *tmp;
1809
1810         list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
1811                 ieee80211_rx_bss_put(dev, bss);
1812 }
1813
1814
1815 static void ieee80211_rx_bss_info(struct net_device *dev,
1816                                   struct ieee80211_mgmt *mgmt,
1817                                   size_t len,
1818                                   struct ieee80211_rx_status *rx_status,
1819                                   int beacon)
1820 {
1821         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1822         struct ieee802_11_elems elems;
1823         size_t baselen;
1824         int channel, clen;
1825         struct ieee80211_sta_bss *bss;
1826         struct sta_info *sta;
1827         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1828         u64 timestamp;
1829         DECLARE_MAC_BUF(mac);
1830         DECLARE_MAC_BUF(mac2);
1831
1832         if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
1833                 return; /* ignore ProbeResp to foreign address */
1834
1835 #if 0
1836         printk(KERN_DEBUG "%s: RX %s from %s to %s\n",
1837                dev->name, beacon ? "Beacon" : "Probe Response",
1838                print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da));
1839 #endif
1840
1841         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1842         if (baselen > len)
1843                 return;
1844
1845         timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1846
1847         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && beacon &&
1848             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1849 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1850                 static unsigned long last_tsf_debug = 0;
1851                 u64 tsf;
1852                 if (local->ops->get_tsf)
1853                         tsf = local->ops->get_tsf(local_to_hw(local));
1854                 else
1855                         tsf = -1LLU;
1856                 if (time_after(jiffies, last_tsf_debug + 5 * HZ)) {
1857                         printk(KERN_DEBUG "RX beacon SA=%s BSSID="
1858                                "%s TSF=0x%llx BCN=0x%llx diff=%lld "
1859                                "@%lu\n",
1860                                print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->bssid),
1861                                (unsigned long long)tsf,
1862                                (unsigned long long)timestamp,
1863                                (unsigned long long)(tsf - timestamp),
1864                                jiffies);
1865                         last_tsf_debug = jiffies;
1866                 }
1867 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1868         }
1869
1870         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1871
1872         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
1873             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
1874             (sta = sta_info_get(local, mgmt->sa))) {
1875                 struct ieee80211_hw_mode *mode;
1876                 struct ieee80211_rate *rates;
1877                 size_t num_rates;
1878                 u32 supp_rates, prev_rates;
1879                 int i, j;
1880
1881                 mode = local->sta_sw_scanning ?
1882                        local->scan_hw_mode : local->oper_hw_mode;
1883
1884                 if (local->sta_hw_scanning) {
1885                         /* search for the correct mode matches the beacon */
1886                         list_for_each_entry(mode, &local->modes_list, list)
1887                                 if (mode->mode == rx_status->phymode)
1888                                         break;
1889
1890                         if (mode == NULL)
1891                                 mode = local->oper_hw_mode;
1892                 }
1893                 rates = mode->rates;
1894                 num_rates = mode->num_rates;
1895
1896                 supp_rates = 0;
1897                 for (i = 0; i < elems.supp_rates_len +
1898                              elems.ext_supp_rates_len; i++) {
1899                         u8 rate = 0;
1900                         int own_rate;
1901                         if (i < elems.supp_rates_len)
1902                                 rate = elems.supp_rates[i];
1903                         else if (elems.ext_supp_rates)
1904                                 rate = elems.ext_supp_rates
1905                                         [i - elems.supp_rates_len];
1906                         own_rate = 5 * (rate & 0x7f);
1907                         for (j = 0; j < num_rates; j++)
1908                                 if (rates[j].rate == own_rate)
1909                                         supp_rates |= BIT(j);
1910                 }
1911
1912                 prev_rates = sta->supp_rates;
1913                 sta->supp_rates &= supp_rates;
1914                 if (sta->supp_rates == 0) {
1915                         /* No matching rates - this should not really happen.
1916                          * Make sure that at least one rate is marked
1917                          * supported to avoid issues with TX rate ctrl. */
1918                         sta->supp_rates = sdata->u.sta.supp_rates_bits;
1919                 }
1920                 if (sta->supp_rates != prev_rates) {
1921                         printk(KERN_DEBUG "%s: updated supp_rates set for "
1922                                "%s based on beacon info (0x%x & 0x%x -> "
1923                                "0x%x)\n",
1924                                dev->name, print_mac(mac, sta->addr), prev_rates,
1925                                supp_rates, sta->supp_rates);
1926                 }
1927                 sta_info_put(sta);
1928         }
1929
1930         if (!elems.ssid)
1931                 return;
1932
1933         if (elems.ds_params && elems.ds_params_len == 1)
1934                 channel = elems.ds_params[0];
1935         else
1936                 channel = rx_status->channel;
1937
1938         bss = ieee80211_rx_bss_get(dev, mgmt->bssid, channel,
1939                                    elems.ssid, elems.ssid_len);
1940         if (!bss) {
1941                 bss = ieee80211_rx_bss_add(dev, mgmt->bssid, channel,
1942                                            elems.ssid, elems.ssid_len);
1943                 if (!bss)
1944                         return;
1945         } else {
1946 #if 0
1947                 /* TODO: order by RSSI? */
1948                 spin_lock_bh(&local->sta_bss_lock);
1949                 list_move_tail(&bss->list, &local->sta_bss_list);
1950                 spin_unlock_bh(&local->sta_bss_lock);
1951 #endif
1952         }
1953
1954         if (bss->probe_resp && beacon) {
1955                 /* Do not allow beacon to override data from Probe Response. */
1956                 ieee80211_rx_bss_put(dev, bss);
1957                 return;
1958         }
1959
1960         /* save the ERP value so that it is available at association time */
1961         if (elems.erp_info && elems.erp_info_len >= 1) {
1962                 bss->erp_value = elems.erp_info[0];
1963                 bss->has_erp_value = 1;
1964         }
1965
1966         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
1967         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
1968
1969         bss->supp_rates_len = 0;
1970         if (elems.supp_rates) {
1971                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1972                 if (clen > elems.supp_rates_len)
1973                         clen = elems.supp_rates_len;
1974                 memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
1975                        clen);
1976                 bss->supp_rates_len += clen;
1977         }
1978         if (elems.ext_supp_rates) {
1979                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1980                 if (clen > elems.ext_supp_rates_len)
1981                         clen = elems.ext_supp_rates_len;
1982                 memcpy(&bss->supp_rates[bss->supp_rates_len],
1983                        elems.ext_supp_rates, clen);
1984                 bss->supp_rates_len += clen;
1985         }
1986
1987         if (elems.wpa &&
1988             (!bss->wpa_ie || bss->wpa_ie_len != elems.wpa_len ||
1989              memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
1990                 kfree(bss->wpa_ie);
1991                 bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
1992                 if (bss->wpa_ie) {
1993                         memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
1994                         bss->wpa_ie_len = elems.wpa_len + 2;
1995                 } else
1996                         bss->wpa_ie_len = 0;
1997         } else if (!elems.wpa && bss->wpa_ie) {
1998                 kfree(bss->wpa_ie);
1999                 bss->wpa_ie = NULL;
2000                 bss->wpa_ie_len = 0;
2001         }
2002
2003         if (elems.rsn &&
2004             (!bss->rsn_ie || bss->rsn_ie_len != elems.rsn_len ||
2005              memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
2006                 kfree(bss->rsn_ie);
2007                 bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
2008                 if (bss->rsn_ie) {
2009                         memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
2010                         bss->rsn_ie_len = elems.rsn_len + 2;
2011                 } else
2012                         bss->rsn_ie_len = 0;
2013         } else if (!elems.rsn && bss->rsn_ie) {
2014                 kfree(bss->rsn_ie);
2015                 bss->rsn_ie = NULL;
2016                 bss->rsn_ie_len = 0;
2017         }
2018
2019         if (elems.wmm_param &&
2020             (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_param_len ||
2021              memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
2022                 kfree(bss->wmm_ie);
2023                 bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
2024                 if (bss->wmm_ie) {
2025                         memcpy(bss->wmm_ie, elems.wmm_param - 2,
2026                                elems.wmm_param_len + 2);
2027                         bss->wmm_ie_len = elems.wmm_param_len + 2;
2028                 } else
2029                         bss->wmm_ie_len = 0;
2030         } else if (!elems.wmm_param && bss->wmm_ie) {
2031                 kfree(bss->wmm_ie);
2032                 bss->wmm_ie = NULL;
2033                 bss->wmm_ie_len = 0;
2034         }
2035         if (elems.ht_cap_elem &&
2036             (!bss->ht_ie || bss->ht_ie_len != elems.ht_cap_elem_len ||
2037              memcmp(bss->ht_ie, elems.ht_cap_elem, elems.ht_cap_elem_len))) {
2038                 kfree(bss->ht_ie);
2039                 bss->ht_ie = kmalloc(elems.ht_cap_elem_len + 2, GFP_ATOMIC);
2040                 if (bss->ht_ie) {
2041                         memcpy(bss->ht_ie, elems.ht_cap_elem - 2,
2042                                elems.ht_cap_elem_len + 2);
2043                         bss->ht_ie_len = elems.ht_cap_elem_len + 2;
2044                 } else
2045                         bss->ht_ie_len = 0;
2046         } else if (!elems.ht_cap_elem && bss->ht_ie) {
2047                 kfree(bss->ht_ie);
2048                 bss->ht_ie = NULL;
2049                 bss->ht_ie_len = 0;
2050         }
2051
2052         bss->hw_mode = rx_status->phymode;
2053         bss->freq = rx_status->freq;
2054         if (channel != rx_status->channel &&
2055             (bss->hw_mode == MODE_IEEE80211G ||
2056              bss->hw_mode == MODE_IEEE80211B) &&
2057             channel >= 1 && channel <= 14) {
2058                 static const int freq_list[] = {
2059                         2412, 2417, 2422, 2427, 2432, 2437, 2442,
2060                         2447, 2452, 2457, 2462, 2467, 2472, 2484
2061                 };
2062                 /* IEEE 802.11g/b mode can receive packets from neighboring
2063                  * channels, so map the channel into frequency. */
2064                 bss->freq = freq_list[channel - 1];
2065         }
2066         bss->timestamp = timestamp;
2067         bss->last_update = jiffies;
2068         bss->rssi = rx_status->ssi;
2069         bss->signal = rx_status->signal;
2070         bss->noise = rx_status->noise;
2071         if (!beacon)
2072                 bss->probe_resp++;
2073         ieee80211_rx_bss_put(dev, bss);
2074 }
2075
2076
2077 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
2078                                          struct ieee80211_mgmt *mgmt,
2079                                          size_t len,
2080                                          struct ieee80211_rx_status *rx_status)
2081 {
2082         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
2083 }
2084
2085
2086 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
2087                                      struct ieee80211_mgmt *mgmt,
2088                                      size_t len,
2089                                      struct ieee80211_rx_status *rx_status)
2090 {
2091         struct ieee80211_sub_if_data *sdata;
2092         struct ieee80211_if_sta *ifsta;
2093         size_t baselen;
2094         struct ieee802_11_elems elems;
2095         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2096         struct ieee80211_conf *conf = &local->hw.conf;
2097         u32 changed = 0;
2098
2099         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
2100
2101         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2102         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2103                 return;
2104         ifsta = &sdata->u.sta;
2105
2106         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
2107             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
2108                 return;
2109
2110         /* Process beacon from the current BSS */
2111         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2112         if (baselen > len)
2113                 return;
2114
2115         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
2116
2117         if (elems.erp_info && elems.erp_info_len >= 1)
2118                 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
2119
2120         if (elems.ht_cap_elem && elems.ht_info_elem &&
2121             elems.wmm_param && local->ops->conf_ht &&
2122             conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
2123                 struct ieee80211_ht_bss_info bss_info;
2124
2125                 ieee80211_ht_addt_info_ie_to_ht_bss_info(
2126                                 (struct ieee80211_ht_addt_info *)
2127                                 elems.ht_info_elem, &bss_info);
2128                 /* check if AP changed bss inforamation */
2129                 if ((conf->ht_bss_conf.primary_channel !=
2130                      bss_info.primary_channel) ||
2131                     (conf->ht_bss_conf.bss_cap != bss_info.bss_cap) ||
2132                     (conf->ht_bss_conf.bss_op_mode != bss_info.bss_op_mode))
2133                         ieee80211_hw_config_ht(local, 1, &conf->ht_conf,
2134                                                 &bss_info);
2135         }
2136
2137         if (elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
2138                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
2139                                          elems.wmm_param_len);
2140         }
2141
2142         ieee80211_bss_info_change_notify(sdata, changed);
2143 }
2144
2145
2146 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
2147                                         struct ieee80211_if_sta *ifsta,
2148                                         struct ieee80211_mgmt *mgmt,
2149                                         size_t len,
2150                                         struct ieee80211_rx_status *rx_status)
2151 {
2152         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2153         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2154         int tx_last_beacon;
2155         struct sk_buff *skb;
2156         struct ieee80211_mgmt *resp;
2157         u8 *pos, *end;
2158         DECLARE_MAC_BUF(mac);
2159 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2160         DECLARE_MAC_BUF(mac2);
2161         DECLARE_MAC_BUF(mac3);
2162 #endif
2163
2164         if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS ||
2165             ifsta->state != IEEE80211_IBSS_JOINED ||
2166             len < 24 + 2 || !ifsta->probe_resp)
2167                 return;
2168
2169         if (local->ops->tx_last_beacon)
2170                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
2171         else
2172                 tx_last_beacon = 1;
2173
2174 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2175         printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
2176                "%s (tx_last_beacon=%d)\n",
2177                dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
2178                print_mac(mac3, mgmt->bssid), tx_last_beacon);
2179 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2180
2181         if (!tx_last_beacon)
2182                 return;
2183
2184         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
2185             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
2186                 return;
2187
2188         end = ((u8 *) mgmt) + len;
2189         pos = mgmt->u.probe_req.variable;
2190         if (pos[0] != WLAN_EID_SSID ||
2191             pos + 2 + pos[1] > end) {
2192                 if (net_ratelimit()) {
2193                         printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
2194                                "from %s\n",
2195                                dev->name, print_mac(mac, mgmt->sa));
2196                 }
2197                 return;
2198         }
2199         if (pos[1] != 0 &&
2200             (pos[1] != ifsta->ssid_len ||
2201              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
2202                 /* Ignore ProbeReq for foreign SSID */
2203                 return;
2204         }
2205
2206         /* Reply with ProbeResp */
2207         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
2208         if (!skb)
2209                 return;
2210
2211         resp = (struct ieee80211_mgmt *) skb->data;
2212         memcpy(resp->da, mgmt->sa, ETH_ALEN);
2213 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2214         printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
2215                dev->name, print_mac(mac, resp->da));
2216 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2217         ieee80211_sta_tx(dev, skb, 0);
2218 }
2219
2220 static void ieee80211_rx_mgmt_action(struct net_device *dev,
2221                                      struct ieee80211_if_sta *ifsta,
2222                                      struct ieee80211_mgmt *mgmt,
2223                                      size_t len)
2224 {
2225         if (len < IEEE80211_MIN_ACTION_SIZE)
2226                 return;
2227
2228         switch (mgmt->u.action.category) {
2229         case WLAN_CATEGORY_BACK:
2230                 switch (mgmt->u.action.u.addba_req.action_code) {
2231                 case WLAN_ACTION_ADDBA_REQ:
2232                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2233                                    sizeof(mgmt->u.action.u.addba_req)))
2234                                 break;
2235                         ieee80211_sta_process_addba_request(dev, mgmt, len);
2236                         break;
2237                 case WLAN_ACTION_DELBA:
2238                         if (len < (IEEE80211_MIN_ACTION_SIZE +
2239                                    sizeof(mgmt->u.action.u.delba)))
2240                                 break;
2241                         ieee80211_sta_process_delba(dev, mgmt, len);
2242                         break;
2243                 default:
2244                         if (net_ratelimit())
2245                            printk(KERN_DEBUG "%s: Rx unknown A-MPDU action\n",
2246                                         dev->name);
2247                         break;
2248                 }
2249                 break;
2250         default:
2251                 break;
2252         }
2253 }
2254
2255 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
2256                            struct ieee80211_rx_status *rx_status)
2257 {
2258         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2259         struct ieee80211_sub_if_data *sdata;
2260         struct ieee80211_if_sta *ifsta;
2261         struct ieee80211_mgmt *mgmt;
2262         u16 fc;
2263
2264         if (skb->len < 24)
2265                 goto fail;
2266
2267         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2268         ifsta = &sdata->u.sta;
2269
2270         mgmt = (struct ieee80211_mgmt *) skb->data;
2271         fc = le16_to_cpu(mgmt->frame_control);
2272
2273         switch (fc & IEEE80211_FCTL_STYPE) {
2274         case IEEE80211_STYPE_PROBE_REQ:
2275         case IEEE80211_STYPE_PROBE_RESP:
2276         case IEEE80211_STYPE_BEACON:
2277                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
2278         case IEEE80211_STYPE_AUTH:
2279         case IEEE80211_STYPE_ASSOC_RESP:
2280         case IEEE80211_STYPE_REASSOC_RESP:
2281         case IEEE80211_STYPE_DEAUTH:
2282         case IEEE80211_STYPE_DISASSOC:
2283         case IEEE80211_STYPE_ACTION:
2284                 skb_queue_tail(&ifsta->skb_queue, skb);
2285                 queue_work(local->hw.workqueue, &ifsta->work);
2286                 return;
2287         default:
2288                 printk(KERN_DEBUG "%s: received unknown management frame - "
2289                        "stype=%d\n", dev->name,
2290                        (fc & IEEE80211_FCTL_STYPE) >> 4);
2291                 break;
2292         }
2293
2294  fail:
2295         kfree_skb(skb);
2296 }
2297
2298
2299 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
2300                                          struct sk_buff *skb)
2301 {
2302         struct ieee80211_rx_status *rx_status;
2303         struct ieee80211_sub_if_data *sdata;
2304         struct ieee80211_if_sta *ifsta;
2305         struct ieee80211_mgmt *mgmt;
2306         u16 fc;
2307
2308         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2309         ifsta = &sdata->u.sta;
2310
2311         rx_status = (struct ieee80211_rx_status *) skb->cb;
2312         mgmt = (struct ieee80211_mgmt *) skb->data;
2313         fc = le16_to_cpu(mgmt->frame_control);
2314
2315         switch (fc & IEEE80211_FCTL_STYPE) {
2316         case IEEE80211_STYPE_PROBE_REQ:
2317                 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
2318                                             rx_status);
2319                 break;
2320         case IEEE80211_STYPE_PROBE_RESP:
2321                 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
2322                 break;
2323         case IEEE80211_STYPE_BEACON:
2324                 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
2325                 break;
2326         case IEEE80211_STYPE_AUTH:
2327                 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
2328                 break;
2329         case IEEE80211_STYPE_ASSOC_RESP:
2330                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
2331                 break;
2332         case IEEE80211_STYPE_REASSOC_RESP:
2333                 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
2334                 break;
2335         case IEEE80211_STYPE_DEAUTH:
2336                 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
2337                 break;
2338         case IEEE80211_STYPE_DISASSOC:
2339                 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
2340                 break;
2341         case IEEE80211_STYPE_ACTION:
2342                 ieee80211_rx_mgmt_action(dev, ifsta, mgmt, skb->len);
2343                 break;
2344         }
2345
2346         kfree_skb(skb);
2347 }
2348
2349
2350 ieee80211_txrx_result
2351 ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
2352                       struct ieee80211_rx_status *rx_status)
2353 {
2354         struct ieee80211_mgmt *mgmt;
2355         u16 fc;
2356
2357         if (skb->len < 2)
2358                 return TXRX_DROP;
2359
2360         mgmt = (struct ieee80211_mgmt *) skb->data;
2361         fc = le16_to_cpu(mgmt->frame_control);
2362
2363         if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL)
2364                 return TXRX_CONTINUE;
2365
2366         if (skb->len < 24)
2367                 return TXRX_DROP;
2368
2369         if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
2370                 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
2371                         ieee80211_rx_mgmt_probe_resp(dev, mgmt,
2372                                                      skb->len, rx_status);
2373                         dev_kfree_skb(skb);
2374                         return TXRX_QUEUED;
2375                 } else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
2376                         ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
2377                                                  rx_status);
2378                         dev_kfree_skb(skb);
2379                         return TXRX_QUEUED;
2380                 }
2381         }
2382         return TXRX_CONTINUE;
2383 }
2384
2385
2386 static int ieee80211_sta_active_ibss(struct net_device *dev)
2387 {
2388         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2389         int active = 0;
2390         struct sta_info *sta;
2391
2392         read_lock_bh(&local->sta_lock);
2393         list_for_each_entry(sta, &local->sta_list, list) {
2394                 if (sta->dev == dev &&
2395                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
2396                                jiffies)) {
2397                         active++;
2398                         break;
2399                 }
2400         }
2401         read_unlock_bh(&local->sta_lock);
2402
2403         return active;
2404 }
2405
2406
2407 static void ieee80211_sta_expire(struct net_device *dev)
2408 {
2409         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2410         struct sta_info *sta, *tmp;
2411         LIST_HEAD(tmp_list);
2412         DECLARE_MAC_BUF(mac);
2413
2414         write_lock_bh(&local->sta_lock);
2415         list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
2416                 if (time_after(jiffies, sta->last_rx +
2417                                IEEE80211_IBSS_INACTIVITY_LIMIT)) {
2418                         printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
2419                                dev->name, print_mac(mac, sta->addr));
2420                         __sta_info_get(sta);
2421                         sta_info_remove(sta);
2422                         list_add(&sta->list, &tmp_list);
2423                 }
2424         write_unlock_bh(&local->sta_lock);
2425
2426         list_for_each_entry_safe(sta, tmp, &tmp_list, list) {
2427                 sta_info_free(sta);
2428                 sta_info_put(sta);
2429         }
2430 }
2431
2432
2433 static void ieee80211_sta_merge_ibss(struct net_device *dev,
2434                                      struct ieee80211_if_sta *ifsta)
2435 {
2436         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2437
2438         ieee80211_sta_expire(dev);
2439         if (ieee80211_sta_active_ibss(dev))
2440                 return;
2441
2442         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
2443                "IBSS networks with same SSID (merge)\n", dev->name);
2444         ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
2445 }
2446
2447
2448 void ieee80211_sta_timer(unsigned long data)
2449 {
2450         struct ieee80211_sub_if_data *sdata =
2451                 (struct ieee80211_sub_if_data *) data;
2452         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2453         struct ieee80211_local *local = wdev_priv(&sdata->wdev);
2454
2455         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2456         queue_work(local->hw.workqueue, &ifsta->work);
2457 }
2458
2459
2460 void ieee80211_sta_work(struct work_struct *work)
2461 {
2462         struct ieee80211_sub_if_data *sdata =
2463                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
2464         struct net_device *dev = sdata->dev;
2465         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2466         struct ieee80211_if_sta *ifsta;
2467         struct sk_buff *skb;
2468
2469         if (!netif_running(dev))
2470                 return;
2471
2472         if (local->sta_sw_scanning || local->sta_hw_scanning)
2473                 return;
2474
2475         if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
2476             sdata->vif.type != IEEE80211_IF_TYPE_IBSS) {
2477                 printk(KERN_DEBUG "%s: ieee80211_sta_work: non-STA interface "
2478                        "(type=%d)\n", dev->name, sdata->vif.type);
2479                 return;
2480         }
2481         ifsta = &sdata->u.sta;
2482
2483         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2484                 ieee80211_sta_rx_queued_mgmt(dev, skb);
2485
2486         if (ifsta->state != IEEE80211_AUTHENTICATE &&
2487             ifsta->state != IEEE80211_ASSOCIATE &&
2488             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2489                 if (ifsta->scan_ssid_len)
2490                         ieee80211_sta_start_scan(dev, ifsta->scan_ssid, ifsta->scan_ssid_len);
2491                 else
2492                         ieee80211_sta_start_scan(dev, NULL, 0);
2493                 return;
2494         }
2495
2496         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2497                 if (ieee80211_sta_config_auth(dev, ifsta))
2498                         return;
2499                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2500         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2501                 return;
2502
2503         switch (ifsta->state) {
2504         case IEEE80211_DISABLED:
2505                 break;
2506         case IEEE80211_AUTHENTICATE:
2507                 ieee80211_authenticate(dev, ifsta);
2508                 break;
2509         case IEEE80211_ASSOCIATE:
2510                 ieee80211_associate(dev, ifsta);
2511                 break;
2512         case IEEE80211_ASSOCIATED:
2513                 ieee80211_associated(dev, ifsta);
2514                 break;
2515         case IEEE80211_IBSS_SEARCH:
2516                 ieee80211_sta_find_ibss(dev, ifsta);
2517                 break;
2518         case IEEE80211_IBSS_JOINED:
2519                 ieee80211_sta_merge_ibss(dev, ifsta);
2520                 break;
2521         default:
2522                 printk(KERN_DEBUG "ieee80211_sta_work: Unknown state %d\n",
2523                        ifsta->state);
2524                 break;
2525         }
2526
2527         if (ieee80211_privacy_mismatch(dev, ifsta)) {
2528                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2529                        "mixed-cell disabled - disassociate\n", dev->name);
2530
2531                 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
2532                 ieee80211_set_disassoc(dev, ifsta, 0);
2533         }
2534 }
2535
2536
2537 static void ieee80211_sta_reset_auth(struct net_device *dev,
2538                                      struct ieee80211_if_sta *ifsta)
2539 {
2540         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2541
2542         if (local->ops->reset_tsf) {
2543                 /* Reset own TSF to allow time synchronization work. */
2544                 local->ops->reset_tsf(local_to_hw(local));
2545         }
2546
2547         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2548
2549
2550         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2551                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2552         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2553                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2554         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2555                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2556         else
2557                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2558         printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
2559                ifsta->auth_alg);
2560         ifsta->auth_transaction = -1;
2561         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2562         ifsta->auth_tries = ifsta->assoc_tries = 0;
2563         netif_carrier_off(dev);
2564 }
2565
2566
2567 void ieee80211_sta_req_auth(struct net_device *dev,
2568                             struct ieee80211_if_sta *ifsta)
2569 {
2570         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2571         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2572
2573         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
2574                 return;
2575
2576         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2577                                 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2578             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2579                                 IEEE80211_STA_AUTO_SSID_SEL))) {
2580                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2581                 queue_work(local->hw.workqueue, &ifsta->work);
2582         }
2583 }
2584
2585 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2586                                     const char *ssid, int ssid_len)
2587 {
2588         int tmp, hidden_ssid;
2589
2590         if (ssid_len == ifsta->ssid_len &&
2591             !memcmp(ifsta->ssid, ssid, ssid_len))
2592                 return 1;
2593
2594         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2595                 return 0;
2596
2597         hidden_ssid = 1;
2598         tmp = ssid_len;
2599         while (tmp--) {
2600                 if (ssid[tmp] != '\0') {
2601                         hidden_ssid = 0;
2602                         break;
2603                 }
2604         }
2605
2606         if (hidden_ssid && ifsta->ssid_len == ssid_len)
2607                 return 1;
2608
2609         if (ssid_len == 1 && ssid[0] == ' ')
2610                 return 1;
2611
2612         return 0;
2613 }
2614
2615 static int ieee80211_sta_config_auth(struct net_device *dev,
2616                                      struct ieee80211_if_sta *ifsta)
2617 {
2618         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2619         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2620         struct ieee80211_sta_bss *bss, *selected = NULL;
2621         int top_rssi = 0, freq;
2622
2623         if (!(ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2624             IEEE80211_STA_AUTO_BSSID_SEL | IEEE80211_STA_AUTO_CHANNEL_SEL))) {
2625                 ifsta->state = IEEE80211_AUTHENTICATE;
2626                 ieee80211_sta_reset_auth(dev, ifsta);
2627                 return 0;
2628         }
2629
2630         spin_lock_bh(&local->sta_bss_lock);
2631         freq = local->oper_channel->freq;
2632         list_for_each_entry(bss, &local->sta_bss_list, list) {
2633                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2634                         continue;
2635
2636                 if (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2637                     !!sdata->default_key)
2638                         continue;
2639
2640                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2641                     bss->freq != freq)
2642                         continue;
2643
2644                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2645                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2646                         continue;
2647
2648                 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
2649                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2650                         continue;
2651
2652                 if (!selected || top_rssi < bss->rssi) {
2653                         selected = bss;
2654                         top_rssi = bss->rssi;
2655                 }
2656         }
2657         if (selected)
2658                 atomic_inc(&selected->users);
2659         spin_unlock_bh(&local->sta_bss_lock);
2660
2661         if (selected) {
2662                 ieee80211_set_channel(local, -1, selected->freq);
2663                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
2664                         ieee80211_sta_set_ssid(dev, selected->ssid,
2665                                                selected->ssid_len);
2666                 ieee80211_sta_set_bssid(dev, selected->bssid);
2667                 ieee80211_rx_bss_put(dev, selected);
2668                 ifsta->state = IEEE80211_AUTHENTICATE;
2669                 ieee80211_sta_reset_auth(dev, ifsta);
2670                 return 0;
2671         } else {
2672                 if (ifsta->state != IEEE80211_AUTHENTICATE) {
2673                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
2674                                 ieee80211_sta_start_scan(dev, NULL, 0);
2675                         else
2676                                 ieee80211_sta_start_scan(dev, ifsta->ssid,
2677                                                          ifsta->ssid_len);
2678                         ifsta->state = IEEE80211_AUTHENTICATE;
2679                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2680                 } else
2681                         ifsta->state = IEEE80211_DISABLED;
2682         }
2683         return -1;
2684 }
2685
2686 static int ieee80211_sta_join_ibss(struct net_device *dev,
2687                                    struct ieee80211_if_sta *ifsta,
2688                                    struct ieee80211_sta_bss *bss)
2689 {
2690         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2691         int res, rates, i, j;
2692         struct sk_buff *skb;
2693         struct ieee80211_mgmt *mgmt;
2694         struct ieee80211_tx_control control;
2695         struct ieee80211_hw_mode *mode;
2696         struct rate_selection ratesel;
2697         u8 *pos;
2698         struct ieee80211_sub_if_data *sdata;
2699
2700         /* Remove possible STA entries from other IBSS networks. */
2701         sta_info_flush(local, NULL);
2702
2703         if (local->ops->reset_tsf) {
2704                 /* Reset own TSF to allow time synchronization work. */
2705                 local->ops->reset_tsf(local_to_hw(local));
2706         }
2707         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2708         res = ieee80211_if_config(dev);
2709         if (res)
2710                 return res;
2711
2712         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2713
2714         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2715         sdata->drop_unencrypted = bss->capability &
2716                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2717
2718         res = ieee80211_set_channel(local, -1, bss->freq);
2719
2720         if (!(local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)) {
2721                 printk(KERN_DEBUG "%s: IBSS not allowed on channel %d "
2722                        "(%d MHz)\n", dev->name, local->hw.conf.channel,
2723                        local->hw.conf.freq);
2724                 return -1;
2725         }
2726
2727         /* Set beacon template based on scan results */
2728         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2729         do {
2730                 if (!skb)
2731                         break;
2732
2733                 skb_reserve(skb, local->hw.extra_tx_headroom);
2734
2735                 mgmt = (struct ieee80211_mgmt *)
2736                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2737                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2738                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2739                                                    IEEE80211_STYPE_BEACON);
2740                 memset(mgmt->da, 0xff, ETH_ALEN);
2741                 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2742                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2743                 mgmt->u.beacon.beacon_int =
2744                         cpu_to_le16(local->hw.conf.beacon_int);
2745                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2746
2747                 pos = skb_put(skb, 2 + ifsta->ssid_len);
2748                 *pos++ = WLAN_EID_SSID;
2749                 *pos++ = ifsta->ssid_len;
2750                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2751
2752                 rates = bss->supp_rates_len;
2753                 if (rates > 8)
2754                         rates = 8;
2755                 pos = skb_put(skb, 2 + rates);
2756                 *pos++ = WLAN_EID_SUPP_RATES;
2757                 *pos++ = rates;
2758                 memcpy(pos, bss->supp_rates, rates);
2759
2760                 pos = skb_put(skb, 2 + 1);
2761                 *pos++ = WLAN_EID_DS_PARAMS;
2762                 *pos++ = 1;
2763                 *pos++ = bss->channel;
2764
2765                 pos = skb_put(skb, 2 + 2);
2766                 *pos++ = WLAN_EID_IBSS_PARAMS;
2767                 *pos++ = 2;
2768                 /* FIX: set ATIM window based on scan results */
2769                 *pos++ = 0;
2770                 *pos++ = 0;
2771
2772                 if (bss->supp_rates_len > 8) {
2773                         rates = bss->supp_rates_len - 8;
2774                         pos = skb_put(skb, 2 + rates);
2775                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
2776                         *pos++ = rates;
2777                         memcpy(pos, &bss->supp_rates[8], rates);
2778                 }
2779
2780                 memset(&control, 0, sizeof(control));
2781                 rate_control_get_rate(dev, local->oper_hw_mode, skb, &ratesel);
2782                 if (!ratesel.rate) {
2783                         printk(KERN_DEBUG "%s: Failed to determine TX rate "
2784                                "for IBSS beacon\n", dev->name);
2785                         break;
2786                 }
2787                 control.vif = &sdata->vif;
2788                 control.tx_rate =
2789                         (sdata->bss_conf.use_short_preamble &&
2790                         (ratesel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
2791                         ratesel.rate->val2 : ratesel.rate->val;
2792                 control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2793                 control.power_level = local->hw.conf.power_level;
2794                 control.flags |= IEEE80211_TXCTL_NO_ACK;
2795                 control.retry_limit = 1;
2796
2797                 ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
2798                 if (ifsta->probe_resp) {
2799                         mgmt = (struct ieee80211_mgmt *)
2800                                 ifsta->probe_resp->data;
2801                         mgmt->frame_control =
2802                                 IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2803                                              IEEE80211_STYPE_PROBE_RESP);
2804                 } else {
2805                         printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
2806                                "template for IBSS\n", dev->name);
2807                 }
2808
2809                 if (local->ops->beacon_update &&
2810                     local->ops->beacon_update(local_to_hw(local),
2811                                              skb, &control) == 0) {
2812                         printk(KERN_DEBUG "%s: Configured IBSS beacon "
2813                                "template based on scan results\n", dev->name);
2814                         skb = NULL;
2815                 }
2816
2817                 rates = 0;
2818                 mode = local->oper_hw_mode;
2819                 for (i = 0; i < bss->supp_rates_len; i++) {
2820                         int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2821                         for (j = 0; j < mode->num_rates; j++)
2822                                 if (mode->rates[j].rate == bitrate)
2823                                         rates |= BIT(j);
2824                 }
2825                 ifsta->supp_rates_bits = rates;
2826         } while (0);
2827
2828         if (skb) {
2829                 printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
2830                        "template\n", dev->name);
2831                 dev_kfree_skb(skb);
2832         }
2833
2834         ifsta->state = IEEE80211_IBSS_JOINED;
2835         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2836
2837         ieee80211_rx_bss_put(dev, bss);
2838
2839         return res;
2840 }
2841
2842
2843 static int ieee80211_sta_create_ibss(struct net_device *dev,
2844                                      struct ieee80211_if_sta *ifsta)
2845 {
2846         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2847         struct ieee80211_sta_bss *bss;
2848         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2849         struct ieee80211_hw_mode *mode;
2850         u8 bssid[ETH_ALEN], *pos;
2851         int i;
2852         DECLARE_MAC_BUF(mac);
2853
2854 #if 0
2855         /* Easier testing, use fixed BSSID. */
2856         memset(bssid, 0xfe, ETH_ALEN);
2857 #else
2858         /* Generate random, not broadcast, locally administered BSSID. Mix in
2859          * own MAC address to make sure that devices that do not have proper
2860          * random number generator get different BSSID. */
2861         get_random_bytes(bssid, ETH_ALEN);
2862         for (i = 0; i < ETH_ALEN; i++)
2863                 bssid[i] ^= dev->dev_addr[i];
2864         bssid[0] &= ~0x01;
2865         bssid[0] |= 0x02;
2866 #endif
2867
2868         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
2869                dev->name, print_mac(mac, bssid));
2870
2871         bss = ieee80211_rx_bss_add(dev, bssid, local->hw.conf.channel,
2872                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2873         if (!bss)
2874                 return -ENOMEM;
2875
2876         mode = local->oper_hw_mode;
2877
2878         if (local->hw.conf.beacon_int == 0)
2879                 local->hw.conf.beacon_int = 100;
2880         bss->beacon_int = local->hw.conf.beacon_int;
2881         bss->hw_mode = local->hw.conf.phymode;
2882         bss->freq = local->hw.conf.freq;
2883         bss->last_update = jiffies;
2884         bss->capability = WLAN_CAPABILITY_IBSS;
2885         if (sdata->default_key) {
2886                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2887         } else
2888                 sdata->drop_unencrypted = 0;
2889         bss->supp_rates_len = mode->num_rates;
2890         pos = bss->supp_rates;
2891         for (i = 0; i < mode->num_rates; i++) {
2892                 int rate = mode->rates[i].rate;
2893                 *pos++ = (u8) (rate / 5);
2894         }
2895
2896         return ieee80211_sta_join_ibss(dev, ifsta, bss);
2897 }
2898
2899
2900 static int ieee80211_sta_find_ibss(struct net_device *dev,
2901                                    struct ieee80211_if_sta *ifsta)
2902 {
2903         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2904         struct ieee80211_sta_bss *bss;
2905         int found = 0;
2906         u8 bssid[ETH_ALEN];
2907         int active_ibss;
2908         DECLARE_MAC_BUF(mac);
2909         DECLARE_MAC_BUF(mac2);
2910
2911         if (ifsta->ssid_len == 0)
2912                 return -EINVAL;
2913
2914         active_ibss = ieee80211_sta_active_ibss(dev);
2915 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2916         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2917                dev->name, active_ibss);
2918 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2919         spin_lock_bh(&local->sta_bss_lock);
2920         list_for_each_entry(bss, &local->sta_bss_list, list) {
2921                 if (ifsta->ssid_len != bss->ssid_len ||
2922                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2923                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2924                         continue;
2925 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2926                 printk(KERN_DEBUG "   bssid=%s found\n",
2927                        print_mac(mac, bss->bssid));
2928 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2929                 memcpy(bssid, bss->bssid, ETH_ALEN);
2930                 found = 1;
2931                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2932                         break;
2933         }
2934         spin_unlock_bh(&local->sta_bss_lock);
2935
2936 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2937         printk(KERN_DEBUG "   sta_find_ibss: selected %s current "
2938                "%s\n", print_mac(mac, bssid), print_mac(mac2, ifsta->bssid));
2939 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2940         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
2941             (bss = ieee80211_rx_bss_get(dev, bssid, local->hw.conf.channel,
2942                                         ifsta->ssid, ifsta->ssid_len))) {
2943                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
2944                        " based on configured SSID\n",
2945                        dev->name, print_mac(mac, bssid));
2946                 return ieee80211_sta_join_ibss(dev, ifsta, bss);
2947         }
2948 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2949         printk(KERN_DEBUG "   did not try to join ibss\n");
2950 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2951
2952         /* Selected IBSS not found in current scan results - try to scan */
2953         if (ifsta->state == IEEE80211_IBSS_JOINED &&
2954             !ieee80211_sta_active_ibss(dev)) {
2955                 mod_timer(&ifsta->timer, jiffies +
2956                                       IEEE80211_IBSS_MERGE_INTERVAL);
2957         } else if (time_after(jiffies, local->last_scan_completed +
2958                               IEEE80211_SCAN_INTERVAL)) {
2959                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2960                        "join\n", dev->name);
2961                 return ieee80211_sta_req_scan(dev, ifsta->ssid,
2962                                               ifsta->ssid_len);
2963         } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
2964                 int interval = IEEE80211_SCAN_INTERVAL;
2965
2966                 if (time_after(jiffies, ifsta->ibss_join_req +
2967                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2968                         if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) &&
2969                             local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)
2970                                 return ieee80211_sta_create_ibss(dev, ifsta);
2971                         if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) {
2972                                 printk(KERN_DEBUG "%s: IBSS not allowed on the"
2973                                        " configured channel %d (%d MHz)\n",
2974                                        dev->name, local->hw.conf.channel,
2975                                        local->hw.conf.freq);
2976                         }
2977
2978                         /* No IBSS found - decrease scan interval and continue
2979                          * scanning. */
2980                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2981                 }
2982
2983                 ifsta->state = IEEE80211_IBSS_SEARCH;
2984                 mod_timer(&ifsta->timer, jiffies + interval);
2985                 return 0;
2986         }
2987
2988         return 0;
2989 }
2990
2991
2992 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
2993 {
2994         struct ieee80211_sub_if_data *sdata;
2995         struct ieee80211_if_sta *ifsta;
2996         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2997
2998         if (len > IEEE80211_MAX_SSID_LEN)
2999                 return -EINVAL;
3000
3001         /* TODO: This should always be done for IBSS, even if IEEE80211_QOS is
3002          * not defined. */
3003         if (local->ops->conf_tx) {
3004                 struct ieee80211_tx_queue_params qparam;
3005                 int i;
3006
3007                 memset(&qparam, 0, sizeof(qparam));
3008                 /* TODO: are these ok defaults for all hw_modes? */
3009                 qparam.aifs = 2;
3010                 qparam.cw_min =
3011                         local->hw.conf.phymode == MODE_IEEE80211B ? 31 : 15;
3012                 qparam.cw_max = 1023;
3013                 qparam.burst_time = 0;
3014                 for (i = IEEE80211_TX_QUEUE_DATA0; i < NUM_TX_DATA_QUEUES; i++)
3015                 {
3016                         local->ops->conf_tx(local_to_hw(local),
3017                                            i + IEEE80211_TX_QUEUE_DATA0,
3018                                            &qparam);
3019                 }
3020                 /* IBSS uses different parameters for Beacon sending */
3021                 qparam.cw_min++;
3022                 qparam.cw_min *= 2;
3023                 qparam.cw_min--;
3024                 local->ops->conf_tx(local_to_hw(local),
3025                                    IEEE80211_TX_QUEUE_BEACON, &qparam);
3026         }
3027
3028         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3029         ifsta = &sdata->u.sta;
3030
3031         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0)
3032                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
3033         memcpy(ifsta->ssid, ssid, len);
3034         memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
3035         ifsta->ssid_len = len;
3036
3037         if (len)
3038                 ifsta->flags |= IEEE80211_STA_SSID_SET;
3039         else
3040                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
3041         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3042             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
3043                 ifsta->ibss_join_req = jiffies;
3044                 ifsta->state = IEEE80211_IBSS_SEARCH;
3045                 return ieee80211_sta_find_ibss(dev, ifsta);
3046         }
3047         return 0;
3048 }
3049
3050
3051 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
3052 {
3053         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3054         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3055         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
3056         *len = ifsta->ssid_len;
3057         return 0;
3058 }
3059
3060
3061 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
3062 {
3063         struct ieee80211_sub_if_data *sdata;
3064         struct ieee80211_if_sta *ifsta;
3065         int res;
3066
3067         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3068         ifsta = &sdata->u.sta;
3069
3070         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
3071                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
3072                 res = ieee80211_if_config(dev);
3073                 if (res) {
3074                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
3075                                "the low-level driver\n", dev->name);
3076                         return res;
3077                 }
3078         }
3079
3080         if (is_valid_ether_addr(bssid))
3081                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
3082         else
3083                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
3084
3085         return 0;
3086 }
3087
3088
3089 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
3090                                     struct ieee80211_sub_if_data *sdata,
3091                                     int powersave)
3092 {
3093         struct sk_buff *skb;
3094         struct ieee80211_hdr *nullfunc;
3095         u16 fc;
3096
3097         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
3098         if (!skb) {
3099                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
3100                        "frame\n", sdata->dev->name);
3101                 return;
3102         }
3103         skb_reserve(skb, local->hw.extra_tx_headroom);
3104
3105         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
3106         memset(nullfunc, 0, 24);
3107         fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
3108              IEEE80211_FCTL_TODS;
3109         if (powersave)
3110                 fc |= IEEE80211_FCTL_PM;
3111         nullfunc->frame_control = cpu_to_le16(fc);
3112         memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
3113         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
3114         memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
3115
3116         ieee80211_sta_tx(sdata->dev, skb, 0);
3117 }
3118
3119
3120 void ieee80211_scan_completed(struct ieee80211_hw *hw)
3121 {
3122         struct ieee80211_local *local = hw_to_local(hw);
3123         struct net_device *dev = local->scan_dev;
3124         struct ieee80211_sub_if_data *sdata;
3125         union iwreq_data wrqu;
3126
3127         local->last_scan_completed = jiffies;
3128         memset(&wrqu, 0, sizeof(wrqu));
3129         wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
3130
3131         if (local->sta_hw_scanning) {
3132                 local->sta_hw_scanning = 0;
3133                 goto done;
3134         }
3135
3136         local->sta_sw_scanning = 0;
3137         if (ieee80211_hw_config(local))
3138                 printk(KERN_DEBUG "%s: failed to restore operational "
3139                        "channel after scan\n", dev->name);
3140
3141
3142         netif_tx_lock_bh(local->mdev);
3143         local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
3144         local->ops->configure_filter(local_to_hw(local),
3145                                      FIF_BCN_PRBRESP_PROMISC,
3146                                      &local->filter_flags,
3147                                      local->mdev->mc_count,
3148                                      local->mdev->mc_list);
3149
3150         netif_tx_unlock_bh(local->mdev);
3151
3152         rcu_read_lock();
3153         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3154
3155                 /* No need to wake the master device. */
3156                 if (sdata->dev == local->mdev)
3157                         continue;
3158
3159                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
3160                         if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
3161                                 ieee80211_send_nullfunc(local, sdata, 0);
3162                         ieee80211_sta_timer((unsigned long)sdata);
3163                 }
3164
3165                 netif_wake_queue(sdata->dev);
3166         }
3167         rcu_read_unlock();
3168
3169 done:
3170         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3171         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
3172                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3173                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
3174                     (!ifsta->state == IEEE80211_IBSS_JOINED &&
3175                     !ieee80211_sta_active_ibss(dev)))
3176                         ieee80211_sta_find_ibss(dev, ifsta);
3177         }
3178 }
3179 EXPORT_SYMBOL(ieee80211_scan_completed);
3180
3181 void ieee80211_sta_scan_work(struct work_struct *work)
3182 {
3183         struct ieee80211_local *local =
3184                 container_of(work, struct ieee80211_local, scan_work.work);
3185         struct net_device *dev = local->scan_dev;
3186         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3187         struct ieee80211_hw_mode *mode;
3188         struct ieee80211_channel *chan;
3189         int skip;
3190         unsigned long next_delay = 0;
3191
3192         if (!local->sta_sw_scanning)
3193                 return;
3194
3195         switch (local->scan_state) {
3196         case SCAN_SET_CHANNEL:
3197                 mode = local->scan_hw_mode;
3198                 if (local->scan_hw_mode->list.next == &local->modes_list &&
3199                     local->scan_channel_idx >= mode->num_channels) {
3200                         ieee80211_scan_completed(local_to_hw(local));
3201                         return;
3202                 }
3203                 skip = !(local->enabled_modes & (1 << mode->mode));
3204                 chan = &mode->channels[local->scan_channel_idx];
3205                 if (!(chan->flag & IEEE80211_CHAN_W_SCAN) ||
3206                     (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
3207                      !(chan->flag & IEEE80211_CHAN_W_IBSS)) ||
3208                     (local->hw_modes & local->enabled_modes &
3209                      (1 << MODE_IEEE80211G) && mode->mode == MODE_IEEE80211B))
3210                         skip = 1;
3211
3212                 if (!skip) {
3213 #if 0
3214                         printk(KERN_DEBUG "%s: scan channel %d (%d MHz)\n",
3215                                dev->name, chan->chan, chan->freq);
3216 #endif
3217
3218                         local->scan_channel = chan;
3219                         if (ieee80211_hw_config(local)) {
3220                                 printk(KERN_DEBUG "%s: failed to set channel "
3221                                        "%d (%d MHz) for scan\n", dev->name,
3222                                        chan->chan, chan->freq);
3223                                 skip = 1;
3224                         }
3225                 }
3226
3227                 local->scan_channel_idx++;
3228                 if (local->scan_channel_idx >= local->scan_hw_mode->num_channels) {
3229                         if (local->scan_hw_mode->list.next != &local->modes_list) {
3230                                 local->scan_hw_mode = list_entry(local->scan_hw_mode->list.next,
3231                                                                  struct ieee80211_hw_mode,
3232                                                                  list);
3233                                 local->scan_channel_idx = 0;
3234                         }
3235                 }
3236
3237                 if (skip)
3238                         break;
3239
3240                 next_delay = IEEE80211_PROBE_DELAY +
3241                              usecs_to_jiffies(local->hw.channel_change_time);
3242                 local->scan_state = SCAN_SEND_PROBE;
3243                 break;
3244         case SCAN_SEND_PROBE:
3245                 if (local->scan_channel->flag & IEEE80211_CHAN_W_ACTIVE_SCAN) {
3246                         ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
3247                                                  local->scan_ssid_len);
3248                         next_delay = IEEE80211_CHANNEL_TIME;
3249                 } else
3250                         next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
3251                 local->scan_state = SCAN_SET_CHANNEL;
3252                 break;
3253         }
3254
3255         if (local->sta_sw_scanning)
3256                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
3257                                    next_delay);
3258 }
3259
3260
3261 static int ieee80211_sta_start_scan(struct net_device *dev,
3262                                     u8 *ssid, size_t ssid_len)
3263 {
3264         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3265         struct ieee80211_sub_if_data *sdata;
3266
3267         if (ssid_len > IEEE80211_MAX_SSID_LEN)
3268                 return -EINVAL;
3269
3270         /* MLME-SCAN.request (page 118)  page 144 (11.1.3.1)
3271          * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
3272          * BSSID: MACAddress
3273          * SSID
3274          * ScanType: ACTIVE, PASSIVE
3275          * ProbeDelay: delay (in microseconds) to be used prior to transmitting
3276          *    a Probe frame during active scanning
3277          * ChannelList
3278          * MinChannelTime (>= ProbeDelay), in TU
3279          * MaxChannelTime: (>= MinChannelTime), in TU
3280          */
3281
3282          /* MLME-SCAN.confirm
3283           * BSSDescriptionSet
3284           * ResultCode: SUCCESS, INVALID_PARAMETERS
3285          */
3286
3287         if (local->sta_sw_scanning || local->sta_hw_scanning) {
3288                 if (local->scan_dev == dev)
3289                         return 0;
3290                 return -EBUSY;
3291         }
3292
3293         if (local->ops->hw_scan) {
3294                 int rc = local->ops->hw_scan(local_to_hw(local),
3295                                              ssid, ssid_len);
3296                 if (!rc) {
3297                         local->sta_hw_scanning = 1;
3298                         local->scan_dev = dev;
3299                 }
3300                 return rc;
3301         }
3302
3303         local->sta_sw_scanning = 1;
3304
3305         rcu_read_lock();
3306         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3307
3308                 /* Don't stop the master interface, otherwise we can't transmit
3309                  * probes! */
3310                 if (sdata->dev == local->mdev)
3311                         continue;
3312
3313                 netif_stop_queue(sdata->dev);
3314                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
3315                     (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
3316                         ieee80211_send_nullfunc(local, sdata, 1);
3317         }
3318         rcu_read_unlock();
3319
3320         if (ssid) {
3321                 local->scan_ssid_len = ssid_len;
3322                 memcpy(local->scan_ssid, ssid, ssid_len);
3323         } else
3324                 local->scan_ssid_len = 0;
3325         local->scan_state = SCAN_SET_CHANNEL;
3326         local->scan_hw_mode = list_entry(local->modes_list.next,
3327                                          struct ieee80211_hw_mode,
3328                                          list);
3329         local->scan_channel_idx = 0;
3330         local->scan_dev = dev;
3331
3332         netif_tx_lock_bh(local->mdev);
3333         local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
3334         local->ops->configure_filter(local_to_hw(local),
3335                                      FIF_BCN_PRBRESP_PROMISC,
3336                                      &local->filter_flags,
3337                                      local->mdev->mc_count,
3338                                      local->mdev->mc_list);
3339         netif_tx_unlock_bh(local->mdev);
3340
3341         /* TODO: start scan as soon as all nullfunc frames are ACKed */
3342         queue_delayed_work(local->hw.workqueue, &local->scan_work,
3343                            IEEE80211_CHANNEL_TIME);
3344
3345         return 0;
3346 }
3347
3348
3349 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
3350 {
3351         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3352         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3353         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3354
3355         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3356                 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
3357
3358         if (local->sta_sw_scanning || local->sta_hw_scanning) {
3359                 if (local->scan_dev == dev)
3360                         return 0;
3361                 return -EBUSY;
3362         }
3363
3364         ifsta->scan_ssid_len = ssid_len;
3365         if (ssid_len)
3366                 memcpy(ifsta->scan_ssid, ssid, ssid_len);
3367         set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
3368         queue_work(local->hw.workqueue, &ifsta->work);
3369         return 0;
3370 }
3371
3372 static char *
3373 ieee80211_sta_scan_result(struct net_device *dev,
3374                           struct ieee80211_sta_bss *bss,
3375                           char *current_ev, char *end_buf)
3376 {
3377         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3378         struct iw_event iwe;
3379
3380         if (time_after(jiffies,
3381                        bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
3382                 return current_ev;
3383
3384         if (!(local->enabled_modes & (1 << bss->hw_mode)))
3385                 return current_ev;
3386
3387         memset(&iwe, 0, sizeof(iwe));
3388         iwe.cmd = SIOCGIWAP;
3389         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
3390         memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
3391         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
3392                                           IW_EV_ADDR_LEN);
3393
3394         memset(&iwe, 0, sizeof(iwe));
3395         iwe.cmd = SIOCGIWESSID;
3396         iwe.u.data.length = bss->ssid_len;
3397         iwe.u.data.flags = 1;
3398         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3399                                           bss->ssid);
3400
3401         if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)) {
3402                 memset(&iwe, 0, sizeof(iwe));
3403                 iwe.cmd = SIOCGIWMODE;
3404                 if (bss->capability & WLAN_CAPABILITY_ESS)
3405                         iwe.u.mode = IW_MODE_MASTER;
3406                 else
3407                         iwe.u.mode = IW_MODE_ADHOC;
3408                 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
3409                                                   IW_EV_UINT_LEN);
3410         }
3411
3412         memset(&iwe, 0, sizeof(iwe));
3413         iwe.cmd = SIOCGIWFREQ;
3414         iwe.u.freq.m = bss->channel;
3415         iwe.u.freq.e = 0;
3416         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
3417                                           IW_EV_FREQ_LEN);
3418         iwe.u.freq.m = bss->freq * 100000;
3419         iwe.u.freq.e = 1;
3420         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
3421                                           IW_EV_FREQ_LEN);
3422
3423         memset(&iwe, 0, sizeof(iwe));
3424         iwe.cmd = IWEVQUAL;
3425         iwe.u.qual.qual = bss->signal;
3426         iwe.u.qual.level = bss->rssi;
3427         iwe.u.qual.noise = bss->noise;
3428         iwe.u.qual.updated = local->wstats_flags;
3429         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
3430                                           IW_EV_QUAL_LEN);
3431
3432         memset(&iwe, 0, sizeof(iwe));
3433         iwe.cmd = SIOCGIWENCODE;
3434         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
3435                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
3436         else
3437                 iwe.u.data.flags = IW_ENCODE_DISABLED;
3438         iwe.u.data.length = 0;
3439         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, "");
3440
3441         if (bss && bss->wpa_ie) {
3442                 memset(&iwe, 0, sizeof(iwe));
3443                 iwe.cmd = IWEVGENIE;
3444                 iwe.u.data.length = bss->wpa_ie_len;
3445                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3446                                                   bss->wpa_ie);
3447         }
3448
3449         if (bss && bss->rsn_ie) {
3450                 memset(&iwe, 0, sizeof(iwe));
3451                 iwe.cmd = IWEVGENIE;
3452                 iwe.u.data.length = bss->rsn_ie_len;
3453                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3454                                                   bss->rsn_ie);
3455         }
3456
3457         if (bss && bss->supp_rates_len > 0) {
3458                 /* display all supported rates in readable format */
3459                 char *p = current_ev + IW_EV_LCP_LEN;
3460                 int i;
3461
3462                 memset(&iwe, 0, sizeof(iwe));
3463                 iwe.cmd = SIOCGIWRATE;
3464                 /* Those two flags are ignored... */
3465                 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
3466
3467                 for (i = 0; i < bss->supp_rates_len; i++) {
3468                         iwe.u.bitrate.value = ((bss->supp_rates[i] &
3469                                                         0x7f) * 500000);
3470                         p = iwe_stream_add_value(current_ev, p,
3471                                         end_buf, &iwe, IW_EV_PARAM_LEN);
3472                 }
3473                 current_ev = p;
3474         }
3475
3476         if (bss) {
3477                 char *buf;
3478                 buf = kmalloc(30, GFP_ATOMIC);
3479                 if (buf) {
3480                         memset(&iwe, 0, sizeof(iwe));
3481                         iwe.cmd = IWEVCUSTOM;
3482                         sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
3483                         iwe.u.data.length = strlen(buf);
3484                         current_ev = iwe_stream_add_point(current_ev, end_buf,
3485                                                           &iwe, buf);
3486                         kfree(buf);
3487                 }
3488         }
3489
3490         return current_ev;
3491 }
3492
3493
3494 int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len)
3495 {
3496         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3497         char *current_ev = buf;
3498         char *end_buf = buf + len;
3499         struct ieee80211_sta_bss *bss;
3500
3501         spin_lock_bh(&local->sta_bss_lock);
3502         list_for_each_entry(bss, &local->sta_bss_list, list) {
3503                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3504                         spin_unlock_bh(&local->sta_bss_lock);
3505                         return -E2BIG;
3506                 }
3507                 current_ev = ieee80211_sta_scan_result(dev, bss, current_ev,
3508                                                        end_buf);
3509         }
3510         spin_unlock_bh(&local->sta_bss_lock);
3511         return current_ev - buf;
3512 }
3513
3514
3515 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
3516 {
3517         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3518         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3519         kfree(ifsta->extra_ie);
3520         if (len == 0) {
3521                 ifsta->extra_ie = NULL;
3522                 ifsta->extra_ie_len = 0;
3523                 return 0;
3524         }
3525         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
3526         if (!ifsta->extra_ie) {
3527                 ifsta->extra_ie_len = 0;
3528                 return -ENOMEM;
3529         }
3530         memcpy(ifsta->extra_ie, ie, len);
3531         ifsta->extra_ie_len = len;
3532         return 0;
3533 }
3534
3535
3536 struct sta_info * ieee80211_ibss_add_sta(struct net_device *dev,
3537                                          struct sk_buff *skb, u8 *bssid,
3538                                          u8 *addr)
3539 {
3540         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3541         struct sta_info *sta;
3542         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3543         DECLARE_MAC_BUF(mac);
3544
3545         /* TODO: Could consider removing the least recently used entry and
3546          * allow new one to be added. */
3547         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
3548                 if (net_ratelimit()) {
3549                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
3550                                "entry %s\n", dev->name, print_mac(mac, addr));
3551                 }
3552                 return NULL;
3553         }
3554
3555         printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
3556                wiphy_name(local->hw.wiphy), print_mac(mac, addr), dev->name);
3557
3558         sta = sta_info_add(local, dev, addr, GFP_ATOMIC);
3559         if (!sta)
3560                 return NULL;
3561
3562         sta->supp_rates = sdata->u.sta.supp_rates_bits;
3563
3564         rate_control_rate_init(sta, local);
3565
3566         return sta; /* caller will call sta_info_put() */
3567 }
3568
3569
3570 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
3571 {
3572         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3573         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3574
3575         printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
3576                dev->name, reason);
3577
3578         if (sdata->vif.type != IEEE80211_IF_TYPE_STA &&
3579             sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
3580                 return -EINVAL;
3581
3582         ieee80211_send_deauth(dev, ifsta, reason);
3583         ieee80211_set_disassoc(dev, ifsta, 1);
3584         return 0;
3585 }
3586
3587
3588 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
3589 {
3590         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3591         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3592
3593         printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
3594                dev->name, reason);
3595
3596         if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
3597                 return -EINVAL;
3598
3599         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
3600                 return -1;
3601
3602         ieee80211_send_disassoc(dev, ifsta, reason);
3603         ieee80211_set_disassoc(dev, ifsta, 0);
3604         return 0;
3605 }