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  * BSS table: use <BSSID,SSID> as the key to support multi-SSID APs
  16  * order BSS list by RSSI(?) ("quality of AP")
  17  * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
  18  *    SSID)
  19  */
  20 #include <linux/delay.h>
  21 #include <linux/if_ether.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/if_arp.h>
  25 #include <linux/wireless.h>
  26 #include <linux/random.h>
  27 #include <linux/etherdevice.h>
  28 #include <net/iw_handler.h>
  29 #include <asm/types.h>
  30
  31 #include <net/mac80211.h>
  32 #include "ieee80211_i.h"
  33 #include "ieee80211_rate.h"
  34 #include "hostapd_ioctl.h"
  35
  36 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  37 #define IEEE80211_AUTH_MAX_TRIES 3
  38 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  39 #define IEEE80211_ASSOC_MAX_TRIES 3
  40 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  41 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  42 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  43 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  44 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  45 #define IEEE80211_IBSS_JOIN_TIMEOUT (20 * HZ)
  46
  47 #define IEEE80211_PROBE_DELAY (HZ / 33)
  48 #define IEEE80211_CHANNEL_TIME (HZ / 33)
  49 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
  50 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
  51 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  52 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  53
  54 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  55
  56
  57 #define IEEE80211_FC(type, stype) cpu_to_le16(type | stype)
  58
  59 #define ERP_INFO_USE_PROTECTION BIT(1)
  60
  61 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
  62                                      u8 *ssid, size_t ssid_len);
  63 static struct ieee80211_sta_bss *
  64 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid);
  65 static void ieee80211_rx_bss_put(struct net_device *dev,
  66                                  struct ieee80211_sta_bss *bss);
  67 static int ieee80211_sta_find_ibss(struct net_device *dev,
  68                                    struct ieee80211_if_sta *ifsta);
  69 static int ieee80211_sta_wep_configured(struct net_device *dev);
  70 static int ieee80211_sta_start_scan(struct net_device *dev,
  71                                     u8 *ssid, size_t ssid_len);
  72 static int ieee80211_sta_config_auth(struct net_device *dev,
  73                                      struct ieee80211_if_sta *ifsta);
  74
  75
  76 /* Parsed Information Elements */
  77 struct ieee802_11_elems {
  78         /* pointers to IEs */
  79         u8 *ssid;
  80         u8 *supp_rates;
  81         u8 *fh_params;
  82         u8 *ds_params;
  83         u8 *cf_params;
  84         u8 *tim;
  85         u8 *ibss_params;
  86         u8 *challenge;
  87         u8 *wpa;
  88         u8 *rsn;
  89         u8 *erp_info;
  90         u8 *ext_supp_rates;
  91         u8 *wmm_info;
  92         u8 *wmm_param;
  93
  94         /* length of them, respectively */
  95         u8 ssid_len;
  96         u8 supp_rates_len;
  97         u8 fh_params_len;
  98         u8 ds_params_len;
  99         u8 cf_params_len;
 100         u8 tim_len;
 101         u8 ibss_params_len;
 102         u8 challenge_len;
 103         u8 wpa_len;
 104         u8 rsn_len;
 105         u8 erp_info_len;
 106         u8 ext_supp_rates_len;
 107         u8 wmm_info_len;
 108         u8 wmm_param_len;
 109 };
 110
 111 typedef enum { ParseOK = 0, ParseUnknown = 1, ParseFailed = -1 } ParseRes;
 112
 113
 114 static ParseRes ieee802_11_parse_elems(u8 *start, size_t len,
 115                                        struct ieee802_11_elems *elems)
 116 {
 117         size_t left = len;
 118         u8 *pos = start;
 119         int unknown = 0;
 120
 121         memset(elems, 0, sizeof(*elems));
 122
 123         while (left >= 2) {
 124                 u8 id, elen;
 125
 126                 id = *pos++;
 127                 elen = *pos++;
 128                 left -= 2;
 129
 130                 if (elen > left) {
 131 #if 0
 132                         if (net_ratelimit())
 133                                 printk(KERN_DEBUG "IEEE 802.11 element parse "
 134                                        "failed (id=%d elen=%d left=%d)\n",
 135                                        id, elen, left);
 136 #endif
 137                         return ParseFailed;
 138                 }
 139
 140                 switch (id) {
 141                 case WLAN_EID_SSID:
 142                         elems->ssid = pos;
 143                         elems->ssid_len = elen;
 144                         break;
 145                 case WLAN_EID_SUPP_RATES:
 146                         elems->supp_rates = pos;
 147                         elems->supp_rates_len = elen;
 148                         break;
 149                 case WLAN_EID_FH_PARAMS:
 150                         elems->fh_params = pos;
 151                         elems->fh_params_len = elen;
 152                         break;
 153                 case WLAN_EID_DS_PARAMS:
 154                         elems->ds_params = pos;
 155                         elems->ds_params_len = elen;
 156                         break;
 157                 case WLAN_EID_CF_PARAMS:
 158                         elems->cf_params = pos;
 159                         elems->cf_params_len = elen;
 160                         break;
 161                 case WLAN_EID_TIM:
 162                         elems->tim = pos;
 163                         elems->tim_len = elen;
 164                         break;
 165                 case WLAN_EID_IBSS_PARAMS:
 166                         elems->ibss_params = pos;
 167                         elems->ibss_params_len = elen;
 168                         break;
 169                 case WLAN_EID_CHALLENGE:
 170                         elems->challenge = pos;
 171                         elems->challenge_len = elen;
 172                         break;
 173                 case WLAN_EID_WPA:
 174                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 175                             pos[2] == 0xf2) {
 176                                 /* Microsoft OUI (00:50:F2) */
 177                                 if (pos[3] == 1) {
 178                                         /* OUI Type 1 - WPA IE */
 179                                         elems->wpa = pos;
 180                                         elems->wpa_len = elen;
 181                                 } else if (elen >= 5 && pos[3] == 2) {
 182                                         if (pos[4] == 0) {
 183                                                 elems->wmm_info = pos;
 184                                                 elems->wmm_info_len = elen;
 185                                         } else if (pos[4] == 1) {
 186                                                 elems->wmm_param = pos;
 187                                                 elems->wmm_param_len = elen;
 188                                         }
 189                                 }
 190                         }
 191                         break;
 192                 case WLAN_EID_RSN:
 193                         elems->rsn = pos;
 194                         elems->rsn_len = elen;
 195                         break;
 196                 case WLAN_EID_ERP_INFO:
 197                         elems->erp_info = pos;
 198                         elems->erp_info_len = elen;
 199                         break;
 200                 case WLAN_EID_EXT_SUPP_RATES:
 201                         elems->ext_supp_rates = pos;
 202                         elems->ext_supp_rates_len = elen;
 203                         break;
 204                 default:
 205 #if 0
 206                         printk(KERN_DEBUG "IEEE 802.11 element parse ignored "
 207                                       "unknown element (id=%d elen=%d)\n",
 208                                       id, elen);
 209 #endif
 210                         unknown++;
 211                         break;
 212                 }
 213
 214                 left -= elen;
 215                 pos += elen;
 216         }
 217
 218         /* Do not trigger error if left == 1 as Apple Airport base stations
 219          * send AssocResps that are one spurious byte too long. */
 220
 221         return unknown ? ParseUnknown : ParseOK;
 222 }
 223
 224
 225
 226
 227 static int ecw2cw(int ecw)
 228 {
 229         int cw = 1;
 230         while (ecw > 0) {
 231                 cw <<= 1;
 232                 ecw--;
 233         }
 234         return cw - 1;
 235 }
 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 void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
 317 {
 318         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 319         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 320         int use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
 321         int preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
 322
 323         if (use_protection != sdata->use_protection) {
 324                 if (net_ratelimit()) {
 325                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
 326                                MAC_FMT ")\n",
 327                                dev->name,
 328                                use_protection ? "enabled" : "disabled",
 329                                MAC_ARG(ifsta->bssid));
 330                 }
 331                 sdata->use_protection = use_protection;
 332         }
 333
 334         if (!preamble_mode != sdata->short_preamble) {
 335                 if (net_ratelimit()) {
 336                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 337                                " (BSSID=" MAC_FMT ")\n",
 338                                dev->name,
 339                                (preamble_mode == WLAN_ERP_PREAMBLE_SHORT) ?
 340                                         "short" : "long",
 341                                MAC_ARG(ifsta->bssid));
 342                 }
 343                 sdata->short_preamble = !preamble_mode;
 344         }
 345 }
 346
 347
 348 static void ieee80211_sta_send_associnfo(struct net_device *dev,
 349                                          struct ieee80211_if_sta *ifsta)
 350 {
 351         char *buf;
 352         size_t len;
 353         int i;
 354         union iwreq_data wrqu;
 355
 356         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 357                 return;
 358
 359         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 360                                 ifsta->assocresp_ies_len), GFP_ATOMIC);
 361         if (!buf)
 362                 return;
 363
 364         len = sprintf(buf, "ASSOCINFO(");
 365         if (ifsta->assocreq_ies) {
 366                 len += sprintf(buf + len, "ReqIEs=");
 367                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 368                         len += sprintf(buf + len, "%02x",
 369                                        ifsta->assocreq_ies[i]);
 370                 }
 371         }
 372         if (ifsta->assocresp_ies) {
 373                 if (ifsta->assocreq_ies)
 374                         len += sprintf(buf + len, " ");
 375                 len += sprintf(buf + len, "RespIEs=");
 376                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 377                         len += sprintf(buf + len, "%02x",
 378                                        ifsta->assocresp_ies[i]);
 379                 }
 380         }
 381         len += sprintf(buf + len, ")");
 382
 383         if (len > IW_CUSTOM_MAX) {
 384                 len = sprintf(buf, "ASSOCRESPIE=");
 385                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 386                         len += sprintf(buf + len, "%02x",
 387                                        ifsta->assocresp_ies[i]);
 388                 }
 389         }
 390
 391         memset(&wrqu, 0, sizeof(wrqu));
 392         wrqu.data.length = len;
 393         wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 394
 395         kfree(buf);
 396 }
 397
 398
 399 static void ieee80211_set_associated(struct net_device *dev,
 400                                      struct ieee80211_if_sta *ifsta, int assoc)
 401 {
 402         union iwreq_data wrqu;
 403         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 404
 405         if (ifsta->associated == assoc)
 406                 return;
 407
 408         ifsta->associated = assoc;
 409
 410         if (assoc) {
 411                 struct ieee80211_sub_if_data *sdata;
 412                 struct ieee80211_sta_bss *bss;
 413                 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 414                 if (sdata->type != IEEE80211_IF_TYPE_STA)
 415                         return;
 416
 417                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 418                 if (bss) {
 419                         if (bss->has_erp_value)
 420                                 ieee80211_handle_erp_ie(dev, bss->erp_value);
 421                         ieee80211_rx_bss_put(dev, bss);
 422                 }
 423
 424                 netif_carrier_on(dev);
 425                 ifsta->prev_bssid_set = 1;
 426                 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 427                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 428                 ieee80211_sta_send_associnfo(dev, ifsta);
 429         } else {
 430                 netif_carrier_off(dev);
 431                 sdata->short_preamble = 0;
 432                 sdata->use_protection = 0;
 433                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 434         }
 435         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 436         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 437         ifsta->last_probe = jiffies;
 438 }
 439
 440 static void ieee80211_set_disassoc(struct net_device *dev,
 441                                    struct ieee80211_if_sta *ifsta, int deauth)
 442 {
 443         if (deauth)
 444                 ifsta->auth_tries = 0;
 445         ifsta->assoc_tries = 0;
 446         ieee80211_set_associated(dev, ifsta, 0);
 447 }
 448
 449 static void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
 450                              int encrypt)
 451 {
 452         struct ieee80211_sub_if_data *sdata;
 453         struct ieee80211_tx_packet_data *pkt_data;
 454
 455         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 456         skb->dev = sdata->local->mdev;
 457         skb_set_mac_header(skb, 0);
 458         skb_set_network_header(skb, 0);
 459         skb_set_transport_header(skb, 0);
 460
 461         pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 462         memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
 463         pkt_data->ifindex = sdata->dev->ifindex;
 464         pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
 465         pkt_data->do_not_encrypt = !encrypt;
 466
 467         dev_queue_xmit(skb);
 468 }
 469
 470
 471 static void ieee80211_send_auth(struct net_device *dev,
 472                                 struct ieee80211_if_sta *ifsta,
 473                                 int transaction, u8 *extra, size_t extra_len,
 474                                 int encrypt)
 475 {
 476         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 477         struct sk_buff *skb;
 478         struct ieee80211_mgmt *mgmt;
 479
 480         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 481                             sizeof(*mgmt) + 6 + extra_len);
 482         if (!skb) {
 483                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 484                        "frame\n", dev->name);
 485                 return;
 486         }
 487         skb_reserve(skb, local->hw.extra_tx_headroom);
 488
 489         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 490         memset(mgmt, 0, 24 + 6);
 491         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 492                                            IEEE80211_STYPE_AUTH);
 493         if (encrypt)
 494                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 495         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 496         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 497         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 498         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 499         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 500         ifsta->auth_transaction = transaction + 1;
 501         mgmt->u.auth.status_code = cpu_to_le16(0);
 502         if (extra)
 503                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 504
 505         ieee80211_sta_tx(dev, skb, encrypt);
 506 }
 507
 508
 509 static void ieee80211_authenticate(struct net_device *dev,
 510                                    struct ieee80211_if_sta *ifsta)
 511 {
 512         ifsta->auth_tries++;
 513         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 514                 printk(KERN_DEBUG "%s: authentication with AP " MAC_FMT
 515                        " timed out\n",
 516                        dev->name, MAC_ARG(ifsta->bssid));
 517                 ifsta->state = IEEE80211_DISABLED;
 518                 return;
 519         }
 520
 521         ifsta->state = IEEE80211_AUTHENTICATE;
 522         printk(KERN_DEBUG "%s: authenticate with AP " MAC_FMT "\n",
 523                dev->name, MAC_ARG(ifsta->bssid));
 524
 525         ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
 526
 527         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 528 }
 529
 530
 531 static void ieee80211_send_assoc(struct net_device *dev,
 532                                  struct ieee80211_if_sta *ifsta)
 533 {
 534         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 535         struct ieee80211_hw_mode *mode;
 536         struct sk_buff *skb;
 537         struct ieee80211_mgmt *mgmt;
 538         u8 *pos, *ies;
 539         int i, len;
 540         u16 capab;
 541         struct ieee80211_sta_bss *bss;
 542         int wmm = 0;
 543
 544         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 545                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 546                             ifsta->ssid_len);
 547         if (!skb) {
 548                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 549                        "frame\n", dev->name);
 550                 return;
 551         }
 552         skb_reserve(skb, local->hw.extra_tx_headroom);
 553
 554         mode = local->oper_hw_mode;
 555         capab = ifsta->capab;
 556         if (mode->mode == MODE_IEEE80211G) {
 557                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
 558                         WLAN_CAPABILITY_SHORT_PREAMBLE;
 559         }
 560         bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 561         if (bss) {
 562                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 563                         capab |= WLAN_CAPABILITY_PRIVACY;
 564                 if (bss->wmm_ie) {
 565                         wmm = 1;
 566                 }
 567                 ieee80211_rx_bss_put(dev, bss);
 568         }
 569
 570         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 571         memset(mgmt, 0, 24);
 572         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 573         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 574         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 575
 576         if (ifsta->prev_bssid_set) {
 577                 skb_put(skb, 10);
 578                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 579                                                    IEEE80211_STYPE_REASSOC_REQ);
 580                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 581                 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
 582                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 583                        ETH_ALEN);
 584         } else {
 585                 skb_put(skb, 4);
 586                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 587                                                    IEEE80211_STYPE_ASSOC_REQ);
 588                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 589                 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
 590         }
 591
 592         /* SSID */
 593         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 594         *pos++ = WLAN_EID_SSID;
 595         *pos++ = ifsta->ssid_len;
 596         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 597
 598         len = mode->num_rates;
 599         if (len > 8)
 600                 len = 8;
 601         pos = skb_put(skb, len + 2);
 602         *pos++ = WLAN_EID_SUPP_RATES;
 603         *pos++ = len;
 604         for (i = 0; i < len; i++) {
 605                 int rate = mode->rates[i].rate;
 606                 if (mode->mode == MODE_ATHEROS_TURBO)
 607                         rate /= 2;
 608                 *pos++ = (u8) (rate / 5);
 609         }
 610
 611         if (mode->num_rates > len) {
 612                 pos = skb_put(skb, mode->num_rates - len + 2);
 613                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 614                 *pos++ = mode->num_rates - len;
 615                 for (i = len; i < mode->num_rates; i++) {
 616                         int rate = mode->rates[i].rate;
 617                         if (mode->mode == MODE_ATHEROS_TURBO)
 618                                 rate /= 2;
 619                         *pos++ = (u8) (rate / 5);
 620                 }
 621         }
 622
 623         if (ifsta->extra_ie) {
 624                 pos = skb_put(skb, ifsta->extra_ie_len);
 625                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 626         }
 627
 628         if (wmm && ifsta->wmm_enabled) {
 629                 pos = skb_put(skb, 9);
 630                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 631                 *pos++ = 7; /* len */
 632                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 633                 *pos++ = 0x50;
 634                 *pos++ = 0xf2;
 635                 *pos++ = 2; /* WME */
 636                 *pos++ = 0; /* WME info */
 637                 *pos++ = 1; /* WME ver */
 638                 *pos++ = 0;
 639         }
 640
 641         kfree(ifsta->assocreq_ies);
 642         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 643         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_ATOMIC);
 644         if (ifsta->assocreq_ies)
 645                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 646
 647         ieee80211_sta_tx(dev, skb, 0);
 648 }
 649
 650
 651 static void ieee80211_send_deauth(struct net_device *dev,
 652                                   struct ieee80211_if_sta *ifsta, u16 reason)
 653 {
 654         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 655         struct sk_buff *skb;
 656         struct ieee80211_mgmt *mgmt;
 657
 658         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 659         if (!skb) {
 660                 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
 661                        "frame\n", dev->name);
 662                 return;
 663         }
 664         skb_reserve(skb, local->hw.extra_tx_headroom);
 665
 666         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 667         memset(mgmt, 0, 24);
 668         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 669         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 670         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 671         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 672                                            IEEE80211_STYPE_DEAUTH);
 673         skb_put(skb, 2);
 674         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 675
 676         ieee80211_sta_tx(dev, skb, 0);
 677 }
 678
 679
 680 static void ieee80211_send_disassoc(struct net_device *dev,
 681                                     struct ieee80211_if_sta *ifsta, u16 reason)
 682 {
 683         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 684         struct sk_buff *skb;
 685         struct ieee80211_mgmt *mgmt;
 686
 687         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 688         if (!skb) {
 689                 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
 690                        "frame\n", dev->name);
 691                 return;
 692         }
 693         skb_reserve(skb, local->hw.extra_tx_headroom);
 694
 695         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 696         memset(mgmt, 0, 24);
 697         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 698         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 699         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 700         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 701                                            IEEE80211_STYPE_DISASSOC);
 702         skb_put(skb, 2);
 703         mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
 704
 705         ieee80211_sta_tx(dev, skb, 0);
 706 }
 707
 708
 709 static int ieee80211_privacy_mismatch(struct net_device *dev,
 710                                       struct ieee80211_if_sta *ifsta)
 711 {
 712         struct ieee80211_sta_bss *bss;
 713         int res = 0;
 714
 715         if (!ifsta || ifsta->mixed_cell ||
 716             ifsta->key_mgmt != IEEE80211_KEY_MGMT_NONE)
 717                 return 0;
 718
 719         bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
 720         if (!bss)
 721                 return 0;
 722
 723         if (ieee80211_sta_wep_configured(dev) !=
 724             !!(bss->capability & WLAN_CAPABILITY_PRIVACY))
 725                 res = 1;
 726
 727         ieee80211_rx_bss_put(dev, bss);
 728
 729         return res;
 730 }
 731
 732
 733 static void ieee80211_associate(struct net_device *dev,
 734                                 struct ieee80211_if_sta *ifsta)
 735 {
 736         ifsta->assoc_tries++;
 737         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 738                 printk(KERN_DEBUG "%s: association with AP " MAC_FMT
 739                        " timed out\n",
 740                        dev->name, MAC_ARG(ifsta->bssid));
 741                 ifsta->state = IEEE80211_DISABLED;
 742                 return;
 743         }
 744
 745         ifsta->state = IEEE80211_ASSOCIATE;
 746         printk(KERN_DEBUG "%s: associate with AP " MAC_FMT "\n",
 747                dev->name, MAC_ARG(ifsta->bssid));
 748         if (ieee80211_privacy_mismatch(dev, ifsta)) {
 749                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 750                        "mixed-cell disabled - abort association\n", dev->name);
 751                 ifsta->state = IEEE80211_DISABLED;
 752                 return;
 753         }
 754
 755         ieee80211_send_assoc(dev, ifsta);
 756
 757         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 758 }
 759
 760
 761 static void ieee80211_associated(struct net_device *dev,
 762                                  struct ieee80211_if_sta *ifsta)
 763 {
 764         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 765         struct sta_info *sta;
 766         int disassoc;
 767
 768         /* TODO: start monitoring current AP signal quality and number of
 769          * missed beacons. Scan other channels every now and then and search
 770          * for better APs. */
 771         /* TODO: remove expired BSSes */
 772
 773         ifsta->state = IEEE80211_ASSOCIATED;
 774
 775         sta = sta_info_get(local, ifsta->bssid);
 776         if (!sta) {
 777                 printk(KERN_DEBUG "%s: No STA entry for own AP " MAC_FMT "\n",
 778                        dev->name, MAC_ARG(ifsta->bssid));
 779                 disassoc = 1;
 780         } else {
 781                 disassoc = 0;
 782                 if (time_after(jiffies,
 783                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 784                         if (ifsta->probereq_poll) {
 785                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 786                                        "current AP " MAC_FMT " - assume out of "
 787                                        "range\n",
 788                                        dev->name, MAC_ARG(ifsta->bssid));
 789                                 disassoc = 1;
 790                                 sta_info_free(sta);
 791                                 ifsta->probereq_poll = 0;
 792                         } else {
 793                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 794                                                          local->scan_ssid,
 795                                                          local->scan_ssid_len);
 796                                 ifsta->probereq_poll = 1;
 797                         }
 798                 } else {
 799                         ifsta->probereq_poll = 0;
 800                         if (time_after(jiffies, ifsta->last_probe +
 801                                        IEEE80211_PROBE_INTERVAL)) {
 802                                 ifsta->last_probe = jiffies;
 803                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 804                                                          ifsta->ssid,
 805                                                          ifsta->ssid_len);
 806                         }
 807                 }
 808                 sta_info_put(sta);
 809         }
 810         if (disassoc) {
 811                 union iwreq_data wrqu;
 812                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 813                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 814                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 815                 mod_timer(&ifsta->timer, jiffies +
 816                                       IEEE80211_MONITORING_INTERVAL + 30 * HZ);
 817         } else {
 818                 mod_timer(&ifsta->timer, jiffies +
 819                                       IEEE80211_MONITORING_INTERVAL);
 820         }
 821 }
 822
 823
 824 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
 825                                      u8 *ssid, size_t ssid_len)
 826 {
 827         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 828         struct ieee80211_hw_mode *mode;
 829         struct sk_buff *skb;
 830         struct ieee80211_mgmt *mgmt;
 831         u8 *pos, *supp_rates, *esupp_rates = NULL;
 832         int i;
 833
 834         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 835         if (!skb) {
 836                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 837                        "request\n", dev->name);
 838                 return;
 839         }
 840         skb_reserve(skb, local->hw.extra_tx_headroom);
 841
 842         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 843         memset(mgmt, 0, 24);
 844         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 845                                            IEEE80211_STYPE_PROBE_REQ);
 846         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 847         if (dst) {
 848                 memcpy(mgmt->da, dst, ETH_ALEN);
 849                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 850         } else {
 851                 memset(mgmt->da, 0xff, ETH_ALEN);
 852                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 853         }
 854         pos = skb_put(skb, 2 + ssid_len);
 855         *pos++ = WLAN_EID_SSID;
 856         *pos++ = ssid_len;
 857         memcpy(pos, ssid, ssid_len);
 858
 859         supp_rates = skb_put(skb, 2);
 860         supp_rates[0] = WLAN_EID_SUPP_RATES;
 861         supp_rates[1] = 0;
 862         mode = local->oper_hw_mode;
 863         for (i = 0; i < mode->num_rates; i++) {
 864                 struct ieee80211_rate *rate = &mode->rates[i];
 865                 if (!(rate->flags & IEEE80211_RATE_SUPPORTED))
 866                         continue;
 867                 if (esupp_rates) {
 868                         pos = skb_put(skb, 1);
 869                         esupp_rates[1]++;
 870                 } else if (supp_rates[1] == 8) {
 871                         esupp_rates = skb_put(skb, 3);
 872                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 873                         esupp_rates[1] = 1;
 874                         pos = &esupp_rates[2];
 875                 } else {
 876                         pos = skb_put(skb, 1);
 877                         supp_rates[1]++;
 878                 }
 879                 if (mode->mode == MODE_ATHEROS_TURBO)
 880                         *pos = rate->rate / 10;
 881                 else
 882                         *pos = rate->rate / 5;
 883         }
 884
 885         ieee80211_sta_tx(dev, skb, 0);
 886 }
 887
 888
 889 static int ieee80211_sta_wep_configured(struct net_device *dev)
 890 {
 891         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 892         if (!sdata || !sdata->default_key ||
 893             sdata->default_key->alg != ALG_WEP)
 894                 return 0;
 895         return 1;
 896 }
 897
 898
 899 static void ieee80211_auth_completed(struct net_device *dev,
 900                                      struct ieee80211_if_sta *ifsta)
 901 {
 902         printk(KERN_DEBUG "%s: authenticated\n", dev->name);
 903         ifsta->authenticated = 1;
 904         ieee80211_associate(dev, ifsta);
 905 }
 906
 907
 908 static void ieee80211_auth_challenge(struct net_device *dev,
 909                                      struct ieee80211_if_sta *ifsta,
 910                                      struct ieee80211_mgmt *mgmt,
 911                                      size_t len)
 912 {
 913         u8 *pos;
 914         struct ieee802_11_elems elems;
 915
 916         printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
 917         pos = mgmt->u.auth.variable;
 918         if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
 919             == ParseFailed) {
 920                 printk(KERN_DEBUG "%s: failed to parse Auth(challenge)\n",
 921                        dev->name);
 922                 return;
 923         }
 924         if (!elems.challenge) {
 925                 printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
 926                        "frame\n", dev->name);
 927                 return;
 928         }
 929         ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
 930                             elems.challenge_len + 2, 1);
 931 }
 932
 933
 934 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
 935                                    struct ieee80211_if_sta *ifsta,
 936                                    struct ieee80211_mgmt *mgmt,
 937                                    size_t len)
 938 {
 939         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 940         u16 auth_alg, auth_transaction, status_code;
 941
 942         if (ifsta->state != IEEE80211_AUTHENTICATE &&
 943             sdata->type != IEEE80211_IF_TYPE_IBSS) {
 944                 printk(KERN_DEBUG "%s: authentication frame received from "
 945                        MAC_FMT ", but not in authenticate state - ignored\n",
 946                        dev->name, MAC_ARG(mgmt->sa));
 947                 return;
 948         }
 949
 950         if (len < 24 + 6) {
 951                 printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
 952                        "received from " MAC_FMT " - ignored\n",
 953                        dev->name, len, MAC_ARG(mgmt->sa));
 954                 return;
 955         }
 956
 957         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 958             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
 959                 printk(KERN_DEBUG "%s: authentication frame received from "
 960                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
 961                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
 962                        MAC_ARG(mgmt->bssid));
 963                 return;
 964         }
 965
 966         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 967             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
 968                 printk(KERN_DEBUG "%s: authentication frame received from "
 969                        "unknown BSSID (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
 970                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
 971                        MAC_ARG(mgmt->bssid));
 972                 return;
 973         }
 974
 975         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 976         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 977         status_code = le16_to_cpu(mgmt->u.auth.status_code);
 978
 979         printk(KERN_DEBUG "%s: RX authentication from " MAC_FMT " (alg=%d "
 980                "transaction=%d status=%d)\n",
 981                dev->name, MAC_ARG(mgmt->sa), auth_alg,
 982                auth_transaction, status_code);
 983
 984         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
 985                 /* IEEE 802.11 standard does not require authentication in IBSS
 986                  * networks and most implementations do not seem to use it.
 987                  * However, try to reply to authentication attempts if someone
 988                  * has actually implemented this.
 989                  * TODO: Could implement shared key authentication. */
 990                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
 991                         printk(KERN_DEBUG "%s: unexpected IBSS authentication "
 992                                "frame (alg=%d transaction=%d)\n",
 993                                dev->name, auth_alg, auth_transaction);
 994                         return;
 995                 }
 996                 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
 997         }
 998
 999         if (auth_alg != ifsta->auth_alg ||
1000             auth_transaction != ifsta->auth_transaction) {
1001                 printk(KERN_DEBUG "%s: unexpected authentication frame "
1002                        "(alg=%d transaction=%d)\n",
1003                        dev->name, auth_alg, auth_transaction);
1004                 return;
1005         }
1006
1007         if (status_code != WLAN_STATUS_SUCCESS) {
1008                 printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
1009                        "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
1010                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1011                         u8 algs[3];
1012                         const int num_algs = ARRAY_SIZE(algs);
1013                         int i, pos;
1014                         algs[0] = algs[1] = algs[2] = 0xff;
1015                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1016                                 algs[0] = WLAN_AUTH_OPEN;
1017                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1018                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1019                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1020                                 algs[2] = WLAN_AUTH_LEAP;
1021                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1022                                 pos = 0;
1023                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1024                                 pos = 1;
1025                         else
1026                                 pos = 2;
1027                         for (i = 0; i < num_algs; i++) {
1028                                 pos++;
1029                                 if (pos >= num_algs)
1030                                         pos = 0;
1031                                 if (algs[pos] == ifsta->auth_alg ||
1032                                     algs[pos] == 0xff)
1033                                         continue;
1034                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1035                                     !ieee80211_sta_wep_configured(dev))
1036                                         continue;
1037                                 ifsta->auth_alg = algs[pos];
1038                                 printk(KERN_DEBUG "%s: set auth_alg=%d for "
1039                                        "next try\n",
1040                                        dev->name, ifsta->auth_alg);
1041                                 break;
1042                         }
1043                 }
1044                 return;
1045         }
1046
1047         switch (ifsta->auth_alg) {
1048         case WLAN_AUTH_OPEN:
1049         case WLAN_AUTH_LEAP:
1050                 ieee80211_auth_completed(dev, ifsta);
1051                 break;
1052         case WLAN_AUTH_SHARED_KEY:
1053                 if (ifsta->auth_transaction == 4)
1054                         ieee80211_auth_completed(dev, ifsta);
1055                 else
1056                         ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1057                 break;
1058         }
1059 }
1060
1061
1062 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1063                                      struct ieee80211_if_sta *ifsta,
1064                                      struct ieee80211_mgmt *mgmt,
1065                                      size_t len)
1066 {
1067         u16 reason_code;
1068
1069         if (len < 24 + 2) {
1070                 printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
1071                        "received from " MAC_FMT " - ignored\n",
1072                        dev->name, len, MAC_ARG(mgmt->sa));
1073                 return;
1074         }
1075
1076         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1077                 printk(KERN_DEBUG "%s: deauthentication frame received from "
1078                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
1079                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
1080                        MAC_ARG(mgmt->bssid));
1081                 return;
1082         }
1083
1084         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1085
1086         printk(KERN_DEBUG "%s: RX deauthentication from " MAC_FMT
1087                " (reason=%d)\n",
1088                dev->name, MAC_ARG(mgmt->sa), reason_code);
1089
1090         if (ifsta->authenticated) {
1091                 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1092         }
1093
1094         if (ifsta->state == IEEE80211_AUTHENTICATE ||
1095             ifsta->state == IEEE80211_ASSOCIATE ||
1096             ifsta->state == IEEE80211_ASSOCIATED) {
1097                 ifsta->state = IEEE80211_AUTHENTICATE;
1098                 mod_timer(&ifsta->timer, jiffies +
1099                                       IEEE80211_RETRY_AUTH_INTERVAL);
1100         }
1101
1102         ieee80211_set_disassoc(dev, ifsta, 1);
1103         ifsta->authenticated = 0;
1104 }
1105
1106
1107 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1108                                        struct ieee80211_if_sta *ifsta,
1109                                        struct ieee80211_mgmt *mgmt,
1110                                        size_t len)
1111 {
1112         u16 reason_code;
1113
1114         if (len < 24 + 2) {
1115                 printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1116                        "received from " MAC_FMT " - ignored\n",
1117                        dev->name, len, MAC_ARG(mgmt->sa));
1118                 return;
1119         }
1120
1121         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1122                 printk(KERN_DEBUG "%s: disassociation frame received from "
1123                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
1124                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
1125                        MAC_ARG(mgmt->bssid));
1126                 return;
1127         }
1128
1129         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1130
1131         printk(KERN_DEBUG "%s: RX disassociation from " MAC_FMT
1132                " (reason=%d)\n",
1133                dev->name, MAC_ARG(mgmt->sa), reason_code);
1134
1135         if (ifsta->associated)
1136                 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1137
1138         if (ifsta->state == IEEE80211_ASSOCIATED) {
1139                 ifsta->state = IEEE80211_ASSOCIATE;
1140                 mod_timer(&ifsta->timer, jiffies +
1141                                       IEEE80211_RETRY_AUTH_INTERVAL);
1142         }
1143
1144         ieee80211_set_disassoc(dev, ifsta, 0);
1145 }
1146
1147
1148 static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
1149                                          struct ieee80211_if_sta *ifsta,
1150                                          struct ieee80211_mgmt *mgmt,
1151                                          size_t len,
1152                                          int reassoc)
1153 {
1154         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1155         struct ieee80211_hw_mode *mode;
1156         struct sta_info *sta;
1157         u32 rates;
1158         u16 capab_info, status_code, aid;
1159         struct ieee802_11_elems elems;
1160         u8 *pos;
1161         int i, j;
1162
1163         /* AssocResp and ReassocResp have identical structure, so process both
1164          * of them in this function. */
1165
1166         if (ifsta->state != IEEE80211_ASSOCIATE) {
1167                 printk(KERN_DEBUG "%s: association frame received from "
1168                        MAC_FMT ", but not in associate state - ignored\n",
1169                        dev->name, MAC_ARG(mgmt->sa));
1170                 return;
1171         }
1172
1173         if (len < 24 + 6) {
1174                 printk(KERN_DEBUG "%s: too short (%zd) association frame "
1175                        "received from " MAC_FMT " - ignored\n",
1176                        dev->name, len, MAC_ARG(mgmt->sa));
1177                 return;
1178         }
1179
1180         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1181                 printk(KERN_DEBUG "%s: association frame received from "
1182                        "unknown AP (SA=" MAC_FMT " BSSID=" MAC_FMT ") - "
1183                        "ignored\n", dev->name, MAC_ARG(mgmt->sa),
1184                        MAC_ARG(mgmt->bssid));
1185                 return;
1186         }
1187
1188         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1189         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1190         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1191         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1192                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1193                        "set\n", dev->name, aid);
1194         aid &= ~(BIT(15) | BIT(14));
1195
1196         printk(KERN_DEBUG "%s: RX %sssocResp from " MAC_FMT " (capab=0x%x "
1197                "status=%d aid=%d)\n",
1198                dev->name, reassoc ? "Rea" : "A", MAC_ARG(mgmt->sa),
1199                capab_info, status_code, aid);
1200
1201         if (status_code != WLAN_STATUS_SUCCESS) {
1202                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1203                        dev->name, status_code);
1204                 /* if this was a reassociation, ensure we try a "full"
1205                  * association next time. This works around some broken APs
1206                  * which do not correctly reject reassociation requests. */
1207                 ifsta->prev_bssid_set = 0;
1208                 return;
1209         }
1210
1211         pos = mgmt->u.assoc_resp.variable;
1212         if (ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems)
1213             == ParseFailed) {
1214                 printk(KERN_DEBUG "%s: failed to parse AssocResp\n",
1215                        dev->name);
1216                 return;
1217         }
1218
1219         if (!elems.supp_rates) {
1220                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1221                        dev->name);
1222                 return;
1223         }
1224
1225         /* it probably doesn't, but if the frame includes an ERP value then
1226          * update our stored copy */
1227         if (elems.erp_info && elems.erp_info_len >= 1) {
1228                 struct ieee80211_sta_bss *bss
1229                         = ieee80211_rx_bss_get(dev, ifsta->bssid);
1230                 if (bss) {
1231                         bss->erp_value = elems.erp_info[0];
1232                         bss->has_erp_value = 1;
1233                         ieee80211_rx_bss_put(dev, bss);
1234                 }
1235         }
1236
1237         printk(KERN_DEBUG "%s: associated\n", dev->name);
1238         ifsta->aid = aid;
1239         ifsta->ap_capab = capab_info;
1240
1241         kfree(ifsta->assocresp_ies);
1242         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1243         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_ATOMIC);
1244         if (ifsta->assocresp_ies)
1245                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1246
1247         ieee80211_set_associated(dev, ifsta, 1);
1248
1249         /* Add STA entry for the AP */
1250         sta = sta_info_get(local, ifsta->bssid);
1251         if (!sta) {
1252                 struct ieee80211_sta_bss *bss;
1253                 sta = sta_info_add(local, dev, ifsta->bssid, GFP_ATOMIC);
1254                 if (!sta) {
1255                         printk(KERN_DEBUG "%s: failed to add STA entry for the"
1256                                " AP\n", dev->name);
1257                         return;
1258                 }
1259                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
1260                 if (bss) {
1261                         sta->last_rssi = bss->rssi;
1262                         sta->last_signal = bss->signal;
1263                         sta->last_noise = bss->noise;
1264                         ieee80211_rx_bss_put(dev, bss);
1265                 }
1266         }
1267
1268         sta->dev = dev;
1269         sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC;
1270         sta->assoc_ap = 1;
1271
1272         rates = 0;
1273         mode = local->oper_hw_mode;
1274         for (i = 0; i < elems.supp_rates_len; i++) {
1275                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1276                 if (mode->mode == MODE_ATHEROS_TURBO)
1277                         rate *= 2;
1278                 for (j = 0; j < mode->num_rates; j++)
1279                         if (mode->rates[j].rate == rate)
1280                                 rates |= BIT(j);
1281         }
1282         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1283                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1284                 if (mode->mode == MODE_ATHEROS_TURBO)
1285                         rate *= 2;
1286                 for (j = 0; j < mode->num_rates; j++)
1287                         if (mode->rates[j].rate == rate)
1288                                 rates |= BIT(j);
1289         }
1290         sta->supp_rates = rates;
1291
1292         rate_control_rate_init(sta, local);
1293
1294         if (elems.wmm_param && ifsta->wmm_enabled) {
1295                 sta->flags |= WLAN_STA_WME;
1296                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1297                                          elems.wmm_param_len);
1298         }
1299
1300
1301         sta_info_put(sta);
1302
1303         ieee80211_associated(dev, ifsta);
1304 }
1305
1306
1307 /* Caller must hold local->sta_bss_lock */
1308 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
1309                                         struct ieee80211_sta_bss *bss)
1310 {
1311         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1312         bss->hnext = local->sta_bss_hash[STA_HASH(bss->bssid)];
1313         local->sta_bss_hash[STA_HASH(bss->bssid)] = bss;
1314 }
1315
1316
1317 /* Caller must hold local->sta_bss_lock */
1318 static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
1319                                         struct ieee80211_sta_bss *bss)
1320 {
1321         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1322         struct ieee80211_sta_bss *b, *prev = NULL;
1323         b = local->sta_bss_hash[STA_HASH(bss->bssid)];
1324         while (b) {
1325                 if (b == bss) {
1326                         if (!prev)
1327                                 local->sta_bss_hash[STA_HASH(bss->bssid)] =
1328                                         bss->hnext;
1329                         else
1330                                 prev->hnext = bss->hnext;
1331                         break;
1332                 }
1333                 prev = b;
1334                 b = b->hnext;
1335         }
1336 }
1337
1338
1339 static struct ieee80211_sta_bss *
1340 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid)
1341 {
1342         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1343         struct ieee80211_sta_bss *bss;
1344
1345         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
1346         if (!bss)
1347                 return NULL;
1348         atomic_inc(&bss->users);
1349         atomic_inc(&bss->users);
1350         memcpy(bss->bssid, bssid, ETH_ALEN);
1351
1352         spin_lock_bh(&local->sta_bss_lock);
1353         /* TODO: order by RSSI? */
1354         list_add_tail(&bss->list, &local->sta_bss_list);
1355         __ieee80211_rx_bss_hash_add(dev, bss);
1356         spin_unlock_bh(&local->sta_bss_lock);
1357         return bss;
1358 }
1359
1360
1361 static struct ieee80211_sta_bss *
1362 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid)
1363 {
1364         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1365         struct ieee80211_sta_bss *bss;
1366
1367         spin_lock_bh(&local->sta_bss_lock);
1368         bss = local->sta_bss_hash[STA_HASH(bssid)];
1369         while (bss) {
1370                 if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0) {
1371                         atomic_inc(&bss->users);
1372                         break;
1373                 }
1374                 bss = bss->hnext;
1375         }
1376         spin_unlock_bh(&local->sta_bss_lock);
1377         return bss;
1378 }
1379
1380
1381 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
1382 {
1383         kfree(bss->wpa_ie);
1384         kfree(bss->rsn_ie);
1385         kfree(bss->wmm_ie);
1386         kfree(bss);
1387 }
1388
1389
1390 static void ieee80211_rx_bss_put(struct net_device *dev,
1391                                  struct ieee80211_sta_bss *bss)
1392 {
1393         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1394         if (!atomic_dec_and_test(&bss->users))
1395                 return;
1396
1397         spin_lock_bh(&local->sta_bss_lock);
1398         __ieee80211_rx_bss_hash_del(dev, bss);
1399         list_del(&bss->list);
1400         spin_unlock_bh(&local->sta_bss_lock);
1401         ieee80211_rx_bss_free(bss);
1402 }
1403
1404
1405 void ieee80211_rx_bss_list_init(struct net_device *dev)
1406 {
1407         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1408         spin_lock_init(&local->sta_bss_lock);
1409         INIT_LIST_HEAD(&local->sta_bss_list);
1410 }
1411
1412
1413 void ieee80211_rx_bss_list_deinit(struct net_device *dev)
1414 {
1415         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1416         struct ieee80211_sta_bss *bss, *tmp;
1417
1418         list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
1419                 ieee80211_rx_bss_put(dev, bss);
1420 }
1421
1422
1423 static void ieee80211_rx_bss_info(struct net_device *dev,
1424                                   struct ieee80211_mgmt *mgmt,
1425                                   size_t len,
1426                                   struct ieee80211_rx_status *rx_status,
1427                                   int beacon)
1428 {
1429         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1430         struct ieee802_11_elems elems;
1431         size_t baselen;
1432         int channel, invalid = 0, clen;
1433         struct ieee80211_sta_bss *bss;
1434         struct sta_info *sta;
1435         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1436         u64 timestamp;
1437
1438         if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
1439                 return; /* ignore ProbeResp to foreign address */
1440
1441 #if 0
1442         printk(KERN_DEBUG "%s: RX %s from " MAC_FMT " to " MAC_FMT "\n",
1443                dev->name, beacon ? "Beacon" : "Probe Response",
1444                MAC_ARG(mgmt->sa), MAC_ARG(mgmt->da));
1445 #endif
1446
1447         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1448         if (baselen > len)
1449                 return;
1450
1451         timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1452
1453         if (sdata->type == IEEE80211_IF_TYPE_IBSS && beacon &&
1454             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1455 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1456                 static unsigned long last_tsf_debug = 0;
1457                 u64 tsf;
1458                 if (local->ops->get_tsf)
1459                         tsf = local->ops->get_tsf(local_to_hw(local));
1460                 else
1461                         tsf = -1LLU;
1462                 if (time_after(jiffies, last_tsf_debug + 5 * HZ)) {
1463                         printk(KERN_DEBUG "RX beacon SA=" MAC_FMT " BSSID="
1464                                MAC_FMT " TSF=0x%llx BCN=0x%llx diff=%lld "
1465                                "@%lu\n",
1466                                MAC_ARG(mgmt->sa), MAC_ARG(mgmt->bssid),
1467                                (unsigned long long)tsf,
1468                                (unsigned long long)timestamp,
1469                                (unsigned long long)(tsf - timestamp),
1470                                jiffies);
1471                         last_tsf_debug = jiffies;
1472                 }
1473 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1474         }
1475
1476         if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
1477                                    &elems) == ParseFailed)
1478                 invalid = 1;
1479
1480         if (sdata->type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
1481             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
1482             (sta = sta_info_get(local, mgmt->sa))) {
1483                 struct ieee80211_hw_mode *mode;
1484                 struct ieee80211_rate *rates;
1485                 size_t num_rates;
1486                 u32 supp_rates, prev_rates;
1487                 int i, j;
1488
1489                 mode = local->sta_scanning ?
1490                        local->scan_hw_mode : local->oper_hw_mode;
1491                 rates = mode->rates;
1492                 num_rates = mode->num_rates;
1493
1494                 supp_rates = 0;
1495                 for (i = 0; i < elems.supp_rates_len +
1496                              elems.ext_supp_rates_len; i++) {
1497                         u8 rate = 0;
1498                         int own_rate;
1499                         if (i < elems.supp_rates_len)
1500                                 rate = elems.supp_rates[i];
1501                         else if (elems.ext_supp_rates)
1502                                 rate = elems.ext_supp_rates
1503                                         [i - elems.supp_rates_len];
1504                         own_rate = 5 * (rate & 0x7f);
1505                         if (mode->mode == MODE_ATHEROS_TURBO)
1506                                 own_rate *= 2;
1507                         for (j = 0; j < num_rates; j++)
1508                                 if (rates[j].rate == own_rate)
1509                                         supp_rates |= BIT(j);
1510                 }
1511
1512                 prev_rates = sta->supp_rates;
1513                 sta->supp_rates &= supp_rates;
1514                 if (sta->supp_rates == 0) {
1515                         /* No matching rates - this should not really happen.
1516                          * Make sure that at least one rate is marked
1517                          * supported to avoid issues with TX rate ctrl. */
1518                         sta->supp_rates = sdata->u.sta.supp_rates_bits;
1519                 }
1520                 if (sta->supp_rates != prev_rates) {
1521                         printk(KERN_DEBUG "%s: updated supp_rates set for "
1522                                MAC_FMT " based on beacon info (0x%x & 0x%x -> "
1523                                "0x%x)\n",
1524                                dev->name, MAC_ARG(sta->addr), prev_rates,
1525                                supp_rates, sta->supp_rates);
1526                 }
1527                 sta_info_put(sta);
1528         }
1529
1530         if (!elems.ssid)
1531                 return;
1532
1533         if (elems.ds_params && elems.ds_params_len == 1)
1534                 channel = elems.ds_params[0];
1535         else
1536                 channel = rx_status->channel;
1537
1538         bss = ieee80211_rx_bss_get(dev, mgmt->bssid);
1539         if (!bss) {
1540                 bss = ieee80211_rx_bss_add(dev, mgmt->bssid);
1541                 if (!bss)
1542                         return;
1543         } else {
1544 #if 0
1545                 /* TODO: order by RSSI? */
1546                 spin_lock_bh(&local->sta_bss_lock);
1547                 list_move_tail(&bss->list, &local->sta_bss_list);
1548                 spin_unlock_bh(&local->sta_bss_lock);
1549 #endif
1550         }
1551
1552         if (bss->probe_resp && beacon) {
1553                 /* Do not allow beacon to override data from Probe Response. */
1554                 ieee80211_rx_bss_put(dev, bss);
1555                 return;
1556         }
1557
1558         /* save the ERP value so that it is available at association time */
1559         if (elems.erp_info && elems.erp_info_len >= 1) {
1560                 bss->erp_value = elems.erp_info[0];
1561                 bss->has_erp_value = 1;
1562         }
1563
1564         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
1565         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
1566         if (elems.ssid && elems.ssid_len <= IEEE80211_MAX_SSID_LEN) {
1567                 memcpy(bss->ssid, elems.ssid, elems.ssid_len);
1568                 bss->ssid_len = elems.ssid_len;
1569         }
1570
1571         bss->supp_rates_len = 0;
1572         if (elems.supp_rates) {
1573                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1574                 if (clen > elems.supp_rates_len)
1575                         clen = elems.supp_rates_len;
1576                 memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
1577                        clen);
1578                 bss->supp_rates_len += clen;
1579         }
1580         if (elems.ext_supp_rates) {
1581                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1582                 if (clen > elems.ext_supp_rates_len)
1583                         clen = elems.ext_supp_rates_len;
1584                 memcpy(&bss->supp_rates[bss->supp_rates_len],
1585                        elems.ext_supp_rates, clen);
1586                 bss->supp_rates_len += clen;
1587         }
1588
1589         if (elems.wpa &&
1590             (!bss->wpa_ie || bss->wpa_ie_len != elems.wpa_len ||
1591              memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
1592                 kfree(bss->wpa_ie);
1593                 bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
1594                 if (bss->wpa_ie) {
1595                         memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
1596                         bss->wpa_ie_len = elems.wpa_len + 2;
1597                 } else
1598                         bss->wpa_ie_len = 0;
1599         } else if (!elems.wpa && bss->wpa_ie) {
1600                 kfree(bss->wpa_ie);
1601                 bss->wpa_ie = NULL;
1602                 bss->wpa_ie_len = 0;
1603         }
1604
1605         if (elems.rsn &&
1606             (!bss->rsn_ie || bss->rsn_ie_len != elems.rsn_len ||
1607              memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
1608                 kfree(bss->rsn_ie);
1609                 bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
1610                 if (bss->rsn_ie) {
1611                         memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
1612                         bss->rsn_ie_len = elems.rsn_len + 2;
1613                 } else
1614                         bss->rsn_ie_len = 0;
1615         } else if (!elems.rsn && bss->rsn_ie) {
1616                 kfree(bss->rsn_ie);
1617                 bss->rsn_ie = NULL;
1618                 bss->rsn_ie_len = 0;
1619         }
1620
1621         if (elems.wmm_param &&
1622             (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_param_len ||
1623              memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
1624                 kfree(bss->wmm_ie);
1625                 bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
1626                 if (bss->wmm_ie) {
1627                         memcpy(bss->wmm_ie, elems.wmm_param - 2,
1628                                elems.wmm_param_len + 2);
1629                         bss->wmm_ie_len = elems.wmm_param_len + 2;
1630                 } else
1631                         bss->wmm_ie_len = 0;
1632         } else if (!elems.wmm_param && bss->wmm_ie) {
1633                 kfree(bss->wmm_ie);
1634                 bss->wmm_ie = NULL;
1635                 bss->wmm_ie_len = 0;
1636         }
1637
1638
1639         bss->hw_mode = rx_status->phymode;
1640         bss->channel = channel;
1641         bss->freq = rx_status->freq;
1642         if (channel != rx_status->channel &&
1643             (bss->hw_mode == MODE_IEEE80211G ||
1644              bss->hw_mode == MODE_IEEE80211B) &&
1645             channel >= 1 && channel <= 14) {
1646                 static const int freq_list[] = {
1647                         2412, 2417, 2422, 2427, 2432, 2437, 2442,
1648                         2447, 2452, 2457, 2462, 2467, 2472, 2484
1649                 };
1650                 /* IEEE 802.11g/b mode can receive packets from neighboring
1651                  * channels, so map the channel into frequency. */
1652                 bss->freq = freq_list[channel - 1];
1653         }
1654         bss->timestamp = timestamp;
1655         bss->last_update = jiffies;
1656         bss->rssi = rx_status->ssi;
1657         bss->signal = rx_status->signal;
1658         bss->noise = rx_status->noise;
1659         if (!beacon)
1660                 bss->probe_resp++;
1661         ieee80211_rx_bss_put(dev, bss);
1662 }
1663
1664
1665 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
1666                                          struct ieee80211_mgmt *mgmt,
1667                                          size_t len,
1668                                          struct ieee80211_rx_status *rx_status)
1669 {
1670         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
1671 }
1672
1673
1674 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
1675                                      struct ieee80211_mgmt *mgmt,
1676                                      size_t len,
1677                                      struct ieee80211_rx_status *rx_status)
1678 {
1679         struct ieee80211_sub_if_data *sdata;
1680         struct ieee80211_if_sta *ifsta;
1681         size_t baselen;
1682         struct ieee802_11_elems elems;
1683
1684         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
1685
1686         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1687         if (sdata->type != IEEE80211_IF_TYPE_STA)
1688                 return;
1689         ifsta = &sdata->u.sta;
1690
1691         if (!ifsta->associated ||
1692             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1693                 return;
1694
1695         /* Process beacon from the current BSS */
1696         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1697         if (baselen > len)
1698                 return;
1699
1700         if (ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen,
1701                                    &elems) == ParseFailed)
1702                 return;
1703
1704         if (elems.erp_info && elems.erp_info_len >= 1)
1705                 ieee80211_handle_erp_ie(dev, elems.erp_info[0]);
1706
1707         if (elems.wmm_param && ifsta->wmm_enabled) {
1708                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1709                                          elems.wmm_param_len);
1710         }
1711 }
1712
1713
1714 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
1715                                         struct ieee80211_if_sta *ifsta,
1716                                         struct ieee80211_mgmt *mgmt,
1717                                         size_t len,
1718                                         struct ieee80211_rx_status *rx_status)
1719 {
1720         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1721         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1722         int tx_last_beacon;
1723         struct sk_buff *skb;
1724         struct ieee80211_mgmt *resp;
1725         u8 *pos, *end;
1726
1727         if (sdata->type != IEEE80211_IF_TYPE_IBSS ||
1728             ifsta->state != IEEE80211_IBSS_JOINED ||
1729             len < 24 + 2 || !ifsta->probe_resp)
1730                 return;
1731
1732         if (local->ops->tx_last_beacon)
1733                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1734         else
1735                 tx_last_beacon = 1;
1736
1737 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1738         printk(KERN_DEBUG "%s: RX ProbeReq SA=" MAC_FMT " DA=" MAC_FMT " BSSID="
1739                MAC_FMT " (tx_last_beacon=%d)\n",
1740                dev->name, MAC_ARG(mgmt->sa), MAC_ARG(mgmt->da),
1741                MAC_ARG(mgmt->bssid), tx_last_beacon);
1742 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1743
1744         if (!tx_last_beacon)
1745                 return;
1746
1747         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1748             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1749                 return;
1750
1751         end = ((u8 *) mgmt) + len;
1752         pos = mgmt->u.probe_req.variable;
1753         if (pos[0] != WLAN_EID_SSID ||
1754             pos + 2 + pos[1] > end) {
1755                 if (net_ratelimit()) {
1756                         printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1757                                "from " MAC_FMT "\n",
1758                                dev->name, MAC_ARG(mgmt->sa));
1759                 }
1760                 return;
1761         }
1762         if (pos[1] != 0 &&
1763             (pos[1] != ifsta->ssid_len ||
1764              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1765                 /* Ignore ProbeReq for foreign SSID */
1766                 return;
1767         }
1768
1769         /* Reply with ProbeResp */
1770         skb = skb_copy(ifsta->probe_resp, GFP_ATOMIC);
1771         if (!skb)
1772                 return;
1773
1774         resp = (struct ieee80211_mgmt *) skb->data;
1775         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1776 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1777         printk(KERN_DEBUG "%s: Sending ProbeResp to " MAC_FMT "\n",
1778                dev->name, MAC_ARG(resp->da));
1779 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1780         ieee80211_sta_tx(dev, skb, 0);
1781 }
1782
1783
1784 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
1785                            struct ieee80211_rx_status *rx_status)
1786 {
1787         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1788         struct ieee80211_sub_if_data *sdata;
1789         struct ieee80211_if_sta *ifsta;
1790         struct ieee80211_mgmt *mgmt;
1791         u16 fc;
1792
1793         if (skb->len < 24)
1794                 goto fail;
1795
1796         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1797         ifsta = &sdata->u.sta;
1798
1799         mgmt = (struct ieee80211_mgmt *) skb->data;
1800         fc = le16_to_cpu(mgmt->frame_control);
1801
1802         switch (fc & IEEE80211_FCTL_STYPE) {
1803         case IEEE80211_STYPE_PROBE_REQ:
1804         case IEEE80211_STYPE_PROBE_RESP:
1805         case IEEE80211_STYPE_BEACON:
1806                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1807         case IEEE80211_STYPE_AUTH:
1808         case IEEE80211_STYPE_ASSOC_RESP:
1809         case IEEE80211_STYPE_REASSOC_RESP:
1810         case IEEE80211_STYPE_DEAUTH:
1811         case IEEE80211_STYPE_DISASSOC:
1812                 skb_queue_tail(&ifsta->skb_queue, skb);
1813                 queue_work(local->hw.workqueue, &ifsta->work);
1814                 return;
1815         default:
1816                 printk(KERN_DEBUG "%s: received unknown management frame - "
1817                        "stype=%d\n", dev->name,
1818                        (fc & IEEE80211_FCTL_STYPE) >> 4);
1819                 break;
1820         }
1821
1822  fail:
1823         kfree_skb(skb);
1824 }
1825
1826
1827 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
1828                                          struct sk_buff *skb)
1829 {
1830         struct ieee80211_rx_status *rx_status;
1831         struct ieee80211_sub_if_data *sdata;
1832         struct ieee80211_if_sta *ifsta;
1833         struct ieee80211_mgmt *mgmt;
1834         u16 fc;
1835
1836         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1837         ifsta = &sdata->u.sta;
1838
1839         rx_status = (struct ieee80211_rx_status *) skb->cb;
1840         mgmt = (struct ieee80211_mgmt *) skb->data;
1841         fc = le16_to_cpu(mgmt->frame_control);
1842
1843         switch (fc & IEEE80211_FCTL_STYPE) {
1844         case IEEE80211_STYPE_PROBE_REQ:
1845                 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
1846                                             rx_status);
1847                 break;
1848         case IEEE80211_STYPE_PROBE_RESP:
1849                 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
1850                 break;
1851         case IEEE80211_STYPE_BEACON:
1852                 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
1853                 break;
1854         case IEEE80211_STYPE_AUTH:
1855                 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
1856                 break;
1857         case IEEE80211_STYPE_ASSOC_RESP:
1858                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 0);
1859                 break;
1860         case IEEE80211_STYPE_REASSOC_RESP:
1861                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 1);
1862                 break;
1863         case IEEE80211_STYPE_DEAUTH:
1864                 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
1865                 break;
1866         case IEEE80211_STYPE_DISASSOC:
1867                 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
1868                 break;
1869         }
1870
1871         kfree_skb(skb);
1872 }
1873
1874
1875 void ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
1876                            struct ieee80211_rx_status *rx_status)
1877 {
1878         struct ieee80211_mgmt *mgmt;
1879         u16 fc;
1880
1881         if (skb->len < 24) {
1882                 dev_kfree_skb(skb);
1883                 return;
1884         }
1885
1886         mgmt = (struct ieee80211_mgmt *) skb->data;
1887         fc = le16_to_cpu(mgmt->frame_control);
1888
1889         if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
1890                 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
1891                         ieee80211_rx_mgmt_probe_resp(dev, mgmt,
1892                                                      skb->len, rx_status);
1893                 } else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
1894                         ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
1895                                                  rx_status);
1896                 }
1897         }
1898
1899         dev_kfree_skb(skb);
1900 }
1901
1902
1903 static int ieee80211_sta_active_ibss(struct net_device *dev)
1904 {
1905         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1906         int active = 0;
1907         struct sta_info *sta;
1908
1909         read_lock_bh(&local->sta_lock);
1910         list_for_each_entry(sta, &local->sta_list, list) {
1911                 if (sta->dev == dev &&
1912                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1913                                jiffies)) {
1914                         active++;
1915                         break;
1916                 }
1917         }
1918         read_unlock_bh(&local->sta_lock);
1919
1920         return active;
1921 }
1922
1923
1924 static void ieee80211_sta_expire(struct net_device *dev)
1925 {
1926         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1927         struct sta_info *sta, *tmp;
1928         LIST_HEAD(tmp_list);
1929
1930         write_lock_bh(&local->sta_lock);
1931         list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
1932                 if (time_after(jiffies, sta->last_rx +
1933                                IEEE80211_IBSS_INACTIVITY_LIMIT)) {
1934                         printk(KERN_DEBUG "%s: expiring inactive STA " MAC_FMT
1935                                "\n", dev->name, MAC_ARG(sta->addr));
1936                         __sta_info_get(sta);
1937                         sta_info_remove(sta);
1938                         list_add(&sta->list, &tmp_list);
1939                 }
1940         write_unlock_bh(&local->sta_lock);
1941
1942         list_for_each_entry_safe(sta, tmp, &tmp_list, list) {
1943                 sta_info_free(sta);
1944                 sta_info_put(sta);
1945         }
1946 }
1947
1948
1949 static void ieee80211_sta_merge_ibss(struct net_device *dev,
1950                                      struct ieee80211_if_sta *ifsta)
1951 {
1952         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1953
1954         ieee80211_sta_expire(dev);
1955         if (ieee80211_sta_active_ibss(dev))
1956                 return;
1957
1958         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1959                "IBSS networks with same SSID (merge)\n", dev->name);
1960         ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
1961 }
1962
1963
1964 void ieee80211_sta_timer(unsigned long data)
1965 {
1966         struct ieee80211_sub_if_data *sdata =
1967                 (struct ieee80211_sub_if_data *) data;
1968         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1969         struct ieee80211_local *local = wdev_priv(&sdata->wdev);
1970
1971         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1972         queue_work(local->hw.workqueue, &ifsta->work);
1973 }
1974
1975
1976 void ieee80211_sta_work(struct work_struct *work)
1977 {
1978         struct ieee80211_sub_if_data *sdata =
1979                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
1980         struct net_device *dev = sdata->dev;
1981         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1982         struct ieee80211_if_sta *ifsta;
1983         struct sk_buff *skb;
1984
1985         if (!netif_running(dev))
1986                 return;
1987
1988         if (local->sta_scanning)
1989                 return;
1990
1991         if (sdata->type != IEEE80211_IF_TYPE_STA &&
1992             sdata->type != IEEE80211_IF_TYPE_IBSS) {
1993                 printk(KERN_DEBUG "%s: ieee80211_sta_work: non-STA interface "
1994                        "(type=%d)\n", dev->name, sdata->type);
1995                 return;
1996         }
1997         ifsta = &sdata->u.sta;
1998
1999         while ((skb = skb_dequeue(&ifsta->skb_queue)))
2000                 ieee80211_sta_rx_queued_mgmt(dev, skb);
2001
2002         if (ifsta->state != IEEE80211_AUTHENTICATE &&
2003             ifsta->state != IEEE80211_ASSOCIATE &&
2004             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2005                 ieee80211_sta_start_scan(dev, NULL, 0);
2006                 return;
2007         }
2008
2009         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2010                 if (ieee80211_sta_config_auth(dev, ifsta))
2011                         return;
2012                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2013         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2014                 return;
2015
2016         switch (ifsta->state) {
2017         case IEEE80211_DISABLED:
2018                 break;
2019         case IEEE80211_AUTHENTICATE:
2020                 ieee80211_authenticate(dev, ifsta);
2021                 break;
2022         case IEEE80211_ASSOCIATE:
2023                 ieee80211_associate(dev, ifsta);
2024                 break;
2025         case IEEE80211_ASSOCIATED:
2026                 ieee80211_associated(dev, ifsta);
2027                 break;
2028         case IEEE80211_IBSS_SEARCH:
2029                 ieee80211_sta_find_ibss(dev, ifsta);
2030                 break;
2031         case IEEE80211_IBSS_JOINED:
2032                 ieee80211_sta_merge_ibss(dev, ifsta);
2033                 break;
2034         default:
2035                 printk(KERN_DEBUG "ieee80211_sta_work: Unknown state %d\n",
2036                        ifsta->state);
2037                 break;
2038         }
2039
2040         if (ieee80211_privacy_mismatch(dev, ifsta)) {
2041                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2042                        "mixed-cell disabled - disassociate\n", dev->name);
2043
2044                 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
2045                 ieee80211_set_disassoc(dev, ifsta, 0);
2046         }
2047 }
2048
2049
2050 static void ieee80211_sta_reset_auth(struct net_device *dev,
2051                                      struct ieee80211_if_sta *ifsta)
2052 {
2053         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2054
2055         if (local->ops->reset_tsf) {
2056                 /* Reset own TSF to allow time synchronization work. */
2057                 local->ops->reset_tsf(local_to_hw(local));
2058         }
2059
2060         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2061
2062
2063         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2064                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2065         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2066                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2067         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2068                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2069         else
2070                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2071         printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
2072                ifsta->auth_alg);
2073         ifsta->auth_transaction = -1;
2074         ifsta->associated = ifsta->auth_tries = ifsta->assoc_tries = 0;
2075         netif_carrier_off(dev);
2076 }
2077
2078
2079 void ieee80211_sta_req_auth(struct net_device *dev,
2080                             struct ieee80211_if_sta *ifsta)
2081 {
2082         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2083         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2084
2085         if (sdata->type != IEEE80211_IF_TYPE_STA)
2086                 return;
2087
2088         if ((ifsta->bssid_set || ifsta->auto_bssid_sel) &&
2089             (ifsta->ssid_set || ifsta->auto_ssid_sel)) {
2090                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2091                 queue_work(local->hw.workqueue, &ifsta->work);
2092         }
2093 }
2094
2095 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2096                                     const char *ssid, int ssid_len)
2097 {
2098         int tmp, hidden_ssid;
2099
2100         if (!memcmp(ifsta->ssid, ssid, ssid_len))
2101                 return 1;
2102
2103         if (ifsta->auto_bssid_sel)
2104                 return 0;
2105
2106         hidden_ssid = 1;
2107         tmp = ssid_len;
2108         while (tmp--) {
2109                 if (ssid[tmp] != '\0') {
2110                         hidden_ssid = 0;
2111                         break;
2112                 }
2113         }
2114
2115         if (hidden_ssid && ifsta->ssid_len == ssid_len)
2116                 return 1;
2117
2118         if (ssid_len == 1 && ssid[0] == ' ')
2119                 return 1;
2120
2121         return 0;
2122 }
2123
2124 static int ieee80211_sta_config_auth(struct net_device *dev,
2125                                      struct ieee80211_if_sta *ifsta)
2126 {
2127         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2128         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2129         struct ieee80211_sta_bss *bss, *selected = NULL;
2130         int top_rssi = 0, freq;
2131
2132         if (!ifsta->auto_channel_sel && !ifsta->auto_bssid_sel &&
2133             !ifsta->auto_ssid_sel) {
2134                 ifsta->state = IEEE80211_AUTHENTICATE;
2135                 ieee80211_sta_reset_auth(dev, ifsta);
2136                 return 0;
2137         }
2138
2139         spin_lock_bh(&local->sta_bss_lock);
2140         freq = local->oper_channel->freq;
2141         list_for_each_entry(bss, &local->sta_bss_list, list) {
2142                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2143                         continue;
2144
2145                 if (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2146                     !!sdata->default_key)
2147                         continue;
2148
2149                 if (!ifsta->auto_channel_sel && bss->freq != freq)
2150                         continue;
2151
2152                 if (!ifsta->auto_bssid_sel &&
2153                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2154                         continue;
2155
2156                 if (!ifsta->auto_ssid_sel &&
2157                     !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
2158                         continue;
2159
2160                 if (!selected || top_rssi < bss->rssi) {
2161                         selected = bss;
2162                         top_rssi = bss->rssi;
2163                 }
2164         }
2165         if (selected)
2166                 atomic_inc(&selected->users);
2167         spin_unlock_bh(&local->sta_bss_lock);
2168
2169         if (selected) {
2170                 ieee80211_set_channel(local, -1, selected->freq);
2171                 if (!ifsta->ssid_set)
2172                         ieee80211_sta_set_ssid(dev, selected->ssid,
2173                                                selected->ssid_len);
2174                 ieee80211_sta_set_bssid(dev, selected->bssid);
2175                 ieee80211_rx_bss_put(dev, selected);
2176                 ifsta->state = IEEE80211_AUTHENTICATE;
2177                 ieee80211_sta_reset_auth(dev, ifsta);
2178                 return 0;
2179         } else {
2180                 if (ifsta->state != IEEE80211_AUTHENTICATE) {
2181                         if (ifsta->auto_ssid_sel)
2182                                 ieee80211_sta_start_scan(dev, NULL, 0);
2183                         else
2184                                 ieee80211_sta_start_scan(dev, ifsta->ssid,
2185                                                          ifsta->ssid_len);
2186                         ifsta->state = IEEE80211_AUTHENTICATE;
2187                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2188                 } else
2189                         ifsta->state = IEEE80211_DISABLED;
2190         }
2191         return -1;
2192 }
2193
2194 static int ieee80211_sta_join_ibss(struct net_device *dev,
2195                                    struct ieee80211_if_sta *ifsta,
2196                                    struct ieee80211_sta_bss *bss)
2197 {
2198         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2199         int res, rates, i, j;
2200         struct sk_buff *skb;
2201         struct ieee80211_mgmt *mgmt;
2202         struct ieee80211_tx_control control;
2203         struct ieee80211_rate *rate;
2204         struct ieee80211_hw_mode *mode;
2205         struct rate_control_extra extra;
2206         u8 *pos;
2207         struct ieee80211_sub_if_data *sdata;
2208
2209         /* Remove possible STA entries from other IBSS networks. */
2210         sta_info_flush(local, NULL);
2211
2212         if (local->ops->reset_tsf) {
2213                 /* Reset own TSF to allow time synchronization work. */
2214                 local->ops->reset_tsf(local_to_hw(local));
2215         }
2216         memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
2217         res = ieee80211_if_config(dev);
2218         if (res)
2219                 return res;
2220
2221         local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
2222
2223         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2224         sdata->drop_unencrypted = bss->capability &
2225                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
2226
2227         res = ieee80211_set_channel(local, -1, bss->freq);
2228
2229         if (!(local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)) {
2230                 printk(KERN_DEBUG "%s: IBSS not allowed on channel %d "
2231                        "(%d MHz)\n", dev->name, local->hw.conf.channel,
2232                        local->hw.conf.freq);
2233                 return -1;
2234         }
2235
2236         /* Set beacon template based on scan results */
2237         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
2238         do {
2239                 if (!skb)
2240                         break;
2241
2242                 skb_reserve(skb, local->hw.extra_tx_headroom);
2243
2244                 mgmt = (struct ieee80211_mgmt *)
2245                         skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2246                 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2247                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2248                                                    IEEE80211_STYPE_BEACON);
2249                 memset(mgmt->da, 0xff, ETH_ALEN);
2250                 memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
2251                 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
2252                 mgmt->u.beacon.beacon_int =
2253                         cpu_to_le16(local->hw.conf.beacon_int);
2254                 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
2255
2256                 pos = skb_put(skb, 2 + ifsta->ssid_len);
2257                 *pos++ = WLAN_EID_SSID;
2258                 *pos++ = ifsta->ssid_len;
2259                 memcpy(pos, ifsta->ssid, ifsta->ssid_len);
2260
2261                 rates = bss->supp_rates_len;
2262                 if (rates > 8)
2263                         rates = 8;
2264                 pos = skb_put(skb, 2 + rates);
2265                 *pos++ = WLAN_EID_SUPP_RATES;
2266                 *pos++ = rates;
2267                 memcpy(pos, bss->supp_rates, rates);
2268
2269                 pos = skb_put(skb, 2 + 1);
2270                 *pos++ = WLAN_EID_DS_PARAMS;
2271                 *pos++ = 1;
2272                 *pos++ = bss->channel;
2273
2274                 pos = skb_put(skb, 2 + 2);
2275                 *pos++ = WLAN_EID_IBSS_PARAMS;
2276                 *pos++ = 2;
2277                 /* FIX: set ATIM window based on scan results */
2278                 *pos++ = 0;
2279                 *pos++ = 0;
2280
2281                 if (bss->supp_rates_len > 8) {
2282                         rates = bss->supp_rates_len - 8;
2283                         pos = skb_put(skb, 2 + rates);
2284                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
2285                         *pos++ = rates;
2286                         memcpy(pos, &bss->supp_rates[8], rates);
2287                 }
2288
2289                 memset(&control, 0, sizeof(control));
2290                 memset(&extra, 0, sizeof(extra));
2291                 extra.mode = local->oper_hw_mode;
2292                 rate = rate_control_get_rate(local, dev, skb, &extra);
2293                 if (!rate) {
2294                         printk(KERN_DEBUG "%s: Failed to determine TX rate "
2295                                "for IBSS beacon\n", dev->name);
2296                         break;
2297                 }
2298                 control.tx_rate = (sdata->short_preamble &&
2299                                    (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
2300                         rate->val2 : rate->val;
2301                 control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2302                 control.power_level = local->hw.conf.power_level;
2303                 control.flags |= IEEE80211_TXCTL_NO_ACK;
2304                 control.retry_limit = 1;
2305
2306                 ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
2307                 if (ifsta->probe_resp) {
2308                         mgmt = (struct ieee80211_mgmt *)
2309                                 ifsta->probe_resp->data;
2310                         mgmt->frame_control =
2311                                 IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2312                                              IEEE80211_STYPE_PROBE_RESP);
2313                 } else {
2314                         printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
2315                                "template for IBSS\n", dev->name);
2316                 }
2317
2318                 if (local->ops->beacon_update &&
2319                     local->ops->beacon_update(local_to_hw(local),
2320                                              skb, &control) == 0) {
2321                         printk(KERN_DEBUG "%s: Configured IBSS beacon "
2322                                "template based on scan results\n", dev->name);
2323                         skb = NULL;
2324                 }
2325
2326                 rates = 0;
2327                 mode = local->oper_hw_mode;
2328                 for (i = 0; i < bss->supp_rates_len; i++) {
2329                         int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2330                         if (mode->mode == MODE_ATHEROS_TURBO)
2331                                 bitrate *= 2;
2332                         for (j = 0; j < mode->num_rates; j++)
2333                                 if (mode->rates[j].rate == bitrate)
2334                                         rates |= BIT(j);
2335                 }
2336                 ifsta->supp_rates_bits = rates;
2337         } while (0);
2338
2339         if (skb) {
2340                 printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
2341                        "template\n", dev->name);
2342                 dev_kfree_skb(skb);
2343         }
2344
2345         ifsta->state = IEEE80211_IBSS_JOINED;
2346         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2347
2348         ieee80211_rx_bss_put(dev, bss);
2349
2350         return res;
2351 }
2352
2353
2354 static int ieee80211_sta_create_ibss(struct net_device *dev,
2355                                      struct ieee80211_if_sta *ifsta)
2356 {
2357         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2358         struct ieee80211_sta_bss *bss;
2359         struct ieee80211_sub_if_data *sdata;
2360         struct ieee80211_hw_mode *mode;
2361         u8 bssid[ETH_ALEN], *pos;
2362         int i;
2363
2364 #if 0
2365         /* Easier testing, use fixed BSSID. */
2366         memset(bssid, 0xfe, ETH_ALEN);
2367 #else
2368         /* Generate random, not broadcast, locally administered BSSID. Mix in
2369          * own MAC address to make sure that devices that do not have proper
2370          * random number generator get different BSSID. */
2371         get_random_bytes(bssid, ETH_ALEN);
2372         for (i = 0; i < ETH_ALEN; i++)
2373                 bssid[i] ^= dev->dev_addr[i];
2374         bssid[0] &= ~0x01;
2375         bssid[0] |= 0x02;
2376 #endif
2377
2378         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID " MAC_FMT "\n",
2379                dev->name, MAC_ARG(bssid));
2380
2381         bss = ieee80211_rx_bss_add(dev, bssid);
2382         if (!bss)
2383                 return -ENOMEM;
2384
2385         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2386         mode = local->oper_hw_mode;
2387
2388         if (local->hw.conf.beacon_int == 0)
2389                 local->hw.conf.beacon_int = 100;
2390         bss->beacon_int = local->hw.conf.beacon_int;
2391         bss->hw_mode = local->hw.conf.phymode;
2392         bss->channel = local->hw.conf.channel;
2393         bss->freq = local->hw.conf.freq;
2394         bss->last_update = jiffies;
2395         bss->capability = WLAN_CAPABILITY_IBSS;
2396         if (sdata->default_key) {
2397                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2398         } else
2399                 sdata->drop_unencrypted = 0;
2400         bss->supp_rates_len = mode->num_rates;
2401         pos = bss->supp_rates;
2402         for (i = 0; i < mode->num_rates; i++) {
2403                 int rate = mode->rates[i].rate;
2404                 if (mode->mode == MODE_ATHEROS_TURBO)
2405                         rate /= 2;
2406                 *pos++ = (u8) (rate / 5);
2407         }
2408
2409         return ieee80211_sta_join_ibss(dev, ifsta, bss);
2410 }
2411
2412
2413 static int ieee80211_sta_find_ibss(struct net_device *dev,
2414                                    struct ieee80211_if_sta *ifsta)
2415 {
2416         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2417         struct ieee80211_sta_bss *bss;
2418         int found = 0;
2419         u8 bssid[ETH_ALEN];
2420         int active_ibss;
2421
2422         if (ifsta->ssid_len == 0)
2423                 return -EINVAL;
2424
2425         active_ibss = ieee80211_sta_active_ibss(dev);
2426 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2427         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2428                dev->name, active_ibss);
2429 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2430         spin_lock_bh(&local->sta_bss_lock);
2431         list_for_each_entry(bss, &local->sta_bss_list, list) {
2432                 if (ifsta->ssid_len != bss->ssid_len ||
2433                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2434                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2435                         continue;
2436 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2437                 printk(KERN_DEBUG "   bssid=" MAC_FMT " found\n",
2438                        MAC_ARG(bss->bssid));
2439 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2440                 memcpy(bssid, bss->bssid, ETH_ALEN);
2441                 found = 1;
2442                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2443                         break;
2444         }
2445         spin_unlock_bh(&local->sta_bss_lock);
2446
2447 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2448         printk(KERN_DEBUG "   sta_find_ibss: selected " MAC_FMT " current "
2449                MAC_FMT "\n", MAC_ARG(bssid), MAC_ARG(ifsta->bssid));
2450 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2451         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
2452             (bss = ieee80211_rx_bss_get(dev, bssid))) {
2453                 printk(KERN_DEBUG "%s: Selected IBSS BSSID " MAC_FMT
2454                        " based on configured SSID\n",
2455                        dev->name, MAC_ARG(bssid));
2456                 return ieee80211_sta_join_ibss(dev, ifsta, bss);
2457         }
2458 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2459         printk(KERN_DEBUG "   did not try to join ibss\n");
2460 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2461
2462         /* Selected IBSS not found in current scan results - try to scan */
2463         if (ifsta->state == IEEE80211_IBSS_JOINED &&
2464             !ieee80211_sta_active_ibss(dev)) {
2465                 mod_timer(&ifsta->timer, jiffies +
2466                                       IEEE80211_IBSS_MERGE_INTERVAL);
2467         } else if (time_after(jiffies, local->last_scan_completed +
2468                               IEEE80211_SCAN_INTERVAL)) {
2469                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
2470                        "join\n", dev->name);
2471                 return ieee80211_sta_req_scan(dev, ifsta->ssid,
2472                                               ifsta->ssid_len);
2473         } else if (ifsta->state != IEEE80211_IBSS_JOINED) {
2474                 int interval = IEEE80211_SCAN_INTERVAL;
2475
2476                 if (time_after(jiffies, ifsta->ibss_join_req +
2477                                IEEE80211_IBSS_JOIN_TIMEOUT)) {
2478                         if (ifsta->create_ibss &&
2479                             local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)
2480                                 return ieee80211_sta_create_ibss(dev, ifsta);
2481                         if (ifsta->create_ibss) {
2482                                 printk(KERN_DEBUG "%s: IBSS not allowed on the"
2483                                        " configured channel %d (%d MHz)\n",
2484                                        dev->name, local->hw.conf.channel,
2485                                        local->hw.conf.freq);
2486                         }
2487
2488                         /* No IBSS found - decrease scan interval and continue
2489                          * scanning. */
2490                         interval = IEEE80211_SCAN_INTERVAL_SLOW;
2491                 }
2492
2493                 ifsta->state = IEEE80211_IBSS_SEARCH;
2494                 mod_timer(&ifsta->timer, jiffies + interval);
2495                 return 0;
2496         }
2497
2498         return 0;
2499 }
2500
2501
2502 int ieee80211_sta_set_ssid(struct net_device *dev, char *ssid, size_t len)
2503 {
2504         struct ieee80211_sub_if_data *sdata;
2505         struct ieee80211_if_sta *ifsta;
2506         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2507
2508         if (len > IEEE80211_MAX_SSID_LEN)
2509                 return -EINVAL;
2510
2511         /* TODO: This should always be done for IBSS, even if IEEE80211_QOS is
2512          * not defined. */
2513         if (local->ops->conf_tx) {
2514                 struct ieee80211_tx_queue_params qparam;
2515                 int i;
2516
2517                 memset(&qparam, 0, sizeof(qparam));
2518                 /* TODO: are these ok defaults for all hw_modes? */
2519                 qparam.aifs = 2;
2520                 qparam.cw_min =
2521                         local->hw.conf.phymode == MODE_IEEE80211B ? 31 : 15;
2522                 qparam.cw_max = 1023;
2523                 qparam.burst_time = 0;
2524                 for (i = IEEE80211_TX_QUEUE_DATA0; i < NUM_TX_DATA_QUEUES; i++)
2525                 {
2526                         local->ops->conf_tx(local_to_hw(local),
2527                                            i + IEEE80211_TX_QUEUE_DATA0,
2528                                            &qparam);
2529                 }
2530                 /* IBSS uses different parameters for Beacon sending */
2531                 qparam.cw_min++;
2532                 qparam.cw_min *= 2;
2533                 qparam.cw_min--;
2534                 local->ops->conf_tx(local_to_hw(local),
2535                                    IEEE80211_TX_QUEUE_BEACON, &qparam);
2536         }
2537
2538         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2539         ifsta = &sdata->u.sta;
2540
2541         if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0)
2542                 ifsta->prev_bssid_set = 0;
2543         memcpy(ifsta->ssid, ssid, len);
2544         memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
2545         ifsta->ssid_len = len;
2546
2547         ifsta->ssid_set = len ? 1 : 0;
2548         if (sdata->type == IEEE80211_IF_TYPE_IBSS && !ifsta->bssid_set) {
2549                 ifsta->ibss_join_req = jiffies;
2550                 ifsta->state = IEEE80211_IBSS_SEARCH;
2551                 return ieee80211_sta_find_ibss(dev, ifsta);
2552         }
2553         return 0;
2554 }
2555
2556
2557 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
2558 {
2559         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2560         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2561         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2562         *len = ifsta->ssid_len;
2563         return 0;
2564 }
2565
2566
2567 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
2568 {
2569         struct ieee80211_sub_if_data *sdata;
2570         struct ieee80211_if_sta *ifsta;
2571         int res;
2572
2573         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2574         ifsta = &sdata->u.sta;
2575
2576         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2577                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2578                 res = ieee80211_if_config(dev);
2579                 if (res) {
2580                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2581                                "the low-level driver\n", dev->name);
2582                         return res;
2583                 }
2584         }
2585
2586         if (!is_valid_ether_addr(bssid))
2587                 ifsta->bssid_set = 0;
2588         else
2589                 ifsta->bssid_set = 1;
2590         return 0;
2591 }
2592
2593
2594 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
2595                                     struct ieee80211_sub_if_data *sdata,
2596                                     int powersave)
2597 {
2598         struct sk_buff *skb;
2599         struct ieee80211_hdr *nullfunc;
2600         u16 fc;
2601
2602         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2603         if (!skb) {
2604                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2605                        "frame\n", sdata->dev->name);
2606                 return;
2607         }
2608         skb_reserve(skb, local->hw.extra_tx_headroom);
2609
2610         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2611         memset(nullfunc, 0, 24);
2612         fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2613              IEEE80211_FCTL_TODS;
2614         if (powersave)
2615                 fc |= IEEE80211_FCTL_PM;
2616         nullfunc->frame_control = cpu_to_le16(fc);
2617         memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
2618         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2619         memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
2620
2621         ieee80211_sta_tx(sdata->dev, skb, 0);
2622 }
2623
2624
2625 void ieee80211_scan_completed(struct ieee80211_hw *hw)
2626 {
2627         struct ieee80211_local *local = hw_to_local(hw);
2628         struct net_device *dev = local->scan_dev;
2629         struct ieee80211_sub_if_data *sdata;
2630         union iwreq_data wrqu;
2631
2632         local->last_scan_completed = jiffies;
2633         wmb();
2634         local->sta_scanning = 0;
2635
2636         if (ieee80211_hw_config(local))
2637                 printk(KERN_DEBUG "%s: failed to restore operational"
2638                        "channel after scan\n", dev->name);
2639
2640         if (!(local->hw.flags & IEEE80211_HW_NO_PROBE_FILTERING) &&
2641             ieee80211_if_config(dev))
2642                 printk(KERN_DEBUG "%s: failed to restore operational"
2643                        "BSSID after scan\n", dev->name);
2644
2645         memset(&wrqu, 0, sizeof(wrqu));
2646         wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
2647
2648         read_lock(&local->sub_if_lock);
2649         list_for_each_entry(sdata, &local->sub_if_list, list) {
2650
2651                 /* No need to wake the master device. */
2652                 if (sdata->dev == local->mdev)
2653                         continue;
2654
2655                 if (sdata->type == IEEE80211_IF_TYPE_STA) {
2656                         if (sdata->u.sta.associated)
2657                                 ieee80211_send_nullfunc(local, sdata, 0);
2658                         ieee80211_sta_timer((unsigned long)sdata);
2659                 }
2660
2661                 netif_wake_queue(sdata->dev);
2662         }
2663         read_unlock(&local->sub_if_lock);
2664
2665         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2666         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
2667                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2668                 if (!ifsta->bssid_set ||
2669                     (!ifsta->state == IEEE80211_IBSS_JOINED &&
2670                     !ieee80211_sta_active_ibss(dev)))
2671                         ieee80211_sta_find_ibss(dev, ifsta);
2672         }
2673 }
2674 EXPORT_SYMBOL(ieee80211_scan_completed);
2675
2676 void ieee80211_sta_scan_work(struct work_struct *work)
2677 {
2678         struct ieee80211_local *local =
2679                 container_of(work, struct ieee80211_local, scan_work.work);
2680         struct net_device *dev = local->scan_dev;
2681         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2682         struct ieee80211_hw_mode *mode;
2683         struct ieee80211_channel *chan;
2684         int skip;
2685         unsigned long next_delay = 0;
2686
2687         if (!local->sta_scanning)
2688                 return;
2689
2690         switch (local->scan_state) {
2691         case SCAN_SET_CHANNEL:
2692                 mode = local->scan_hw_mode;
2693                 if (local->scan_hw_mode->list.next == &local->modes_list &&
2694                     local->scan_channel_idx >= mode->num_channels) {
2695                         ieee80211_scan_completed(local_to_hw(local));
2696                         return;
2697                 }
2698                 skip = !(local->enabled_modes & (1 << mode->mode));
2699                 chan = &mode->channels[local->scan_channel_idx];
2700                 if (!(chan->flag & IEEE80211_CHAN_W_SCAN) ||
2701                     (sdata->type == IEEE80211_IF_TYPE_IBSS &&
2702                      !(chan->flag & IEEE80211_CHAN_W_IBSS)) ||
2703                     (local->hw_modes & local->enabled_modes &
2704                      (1 << MODE_IEEE80211G) && mode->mode == MODE_IEEE80211B))
2705                         skip = 1;
2706
2707                 if (!skip) {
2708 #if 0
2709                         printk(KERN_DEBUG "%s: scan channel %d (%d MHz)\n",
2710                                dev->name, chan->chan, chan->freq);
2711 #endif
2712
2713                         local->scan_channel = chan;
2714                         if (ieee80211_hw_config(local)) {
2715                                 printk(KERN_DEBUG "%s: failed to set channel "
2716                                        "%d (%d MHz) for scan\n", dev->name,
2717                                        chan->chan, chan->freq);
2718                                 skip = 1;
2719                         }
2720                 }
2721
2722                 local->scan_channel_idx++;
2723                 if (local->scan_channel_idx >= local->scan_hw_mode->num_channels) {
2724                         if (local->scan_hw_mode->list.next != &local->modes_list) {
2725                                 local->scan_hw_mode = list_entry(local->scan_hw_mode->list.next,
2726                                                                  struct ieee80211_hw_mode,
2727                                                                  list);
2728                                 local->scan_channel_idx = 0;
2729                         }
2730                 }
2731
2732                 if (skip)
2733                         break;
2734
2735                 next_delay = IEEE80211_PROBE_DELAY +
2736                              usecs_to_jiffies(local->hw.channel_change_time);
2737                 local->scan_state = SCAN_SEND_PROBE;
2738                 break;
2739         case SCAN_SEND_PROBE:
2740                 if (local->scan_channel->flag & IEEE80211_CHAN_W_ACTIVE_SCAN) {
2741                         ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
2742                                                  local->scan_ssid_len);
2743                         next_delay = IEEE80211_CHANNEL_TIME;
2744                 } else
2745                         next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
2746                 local->scan_state = SCAN_SET_CHANNEL;
2747                 break;
2748         }
2749
2750         if (local->sta_scanning)
2751                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2752                                    next_delay);
2753 }
2754
2755
2756 static int ieee80211_sta_start_scan(struct net_device *dev,
2757                                     u8 *ssid, size_t ssid_len)
2758 {
2759         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2760         struct ieee80211_sub_if_data *sdata;
2761
2762         if (ssid_len > IEEE80211_MAX_SSID_LEN)
2763                 return -EINVAL;
2764
2765         /* MLME-SCAN.request (page 118)  page 144 (11.1.3.1)
2766          * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
2767          * BSSID: MACAddress
2768          * SSID
2769          * ScanType: ACTIVE, PASSIVE
2770          * ProbeDelay: delay (in microseconds) to be used prior to transmitting
2771          *    a Probe frame during active scanning
2772          * ChannelList
2773          * MinChannelTime (>= ProbeDelay), in TU
2774          * MaxChannelTime: (>= MinChannelTime), in TU
2775          */
2776
2777          /* MLME-SCAN.confirm
2778           * BSSDescriptionSet
2779           * ResultCode: SUCCESS, INVALID_PARAMETERS
2780          */
2781
2782         if (local->sta_scanning) {
2783                 if (local->scan_dev == dev)
2784                         return 0;
2785                 return -EBUSY;
2786         }
2787
2788         if (local->ops->hw_scan) {
2789                 int rc = local->ops->hw_scan(local_to_hw(local),
2790                                             ssid, ssid_len);
2791                 if (!rc) {
2792                         local->sta_scanning = 1;
2793                         local->scan_dev = dev;
2794                 }
2795                 return rc;
2796         }
2797
2798         local->sta_scanning = 1;
2799
2800         read_lock(&local->sub_if_lock);
2801         list_for_each_entry(sdata, &local->sub_if_list, list) {
2802
2803                 /* Don't stop the master interface, otherwise we can't transmit
2804                  * probes! */
2805                 if (sdata->dev == local->mdev)
2806                         continue;
2807
2808                 netif_stop_queue(sdata->dev);
2809                 if (sdata->type == IEEE80211_IF_TYPE_STA &&
2810                     sdata->u.sta.associated)
2811                         ieee80211_send_nullfunc(local, sdata, 1);
2812         }
2813         read_unlock(&local->sub_if_lock);
2814
2815         if (ssid) {
2816                 local->scan_ssid_len = ssid_len;
2817                 memcpy(local->scan_ssid, ssid, ssid_len);
2818         } else
2819                 local->scan_ssid_len = 0;
2820         local->scan_state = SCAN_SET_CHANNEL;
2821         local->scan_hw_mode = list_entry(local->modes_list.next,
2822                                          struct ieee80211_hw_mode,
2823                                          list);
2824         local->scan_channel_idx = 0;
2825         local->scan_dev = dev;
2826
2827         if (!(local->hw.flags & IEEE80211_HW_NO_PROBE_FILTERING) &&
2828             ieee80211_if_config(dev))
2829                 printk(KERN_DEBUG "%s: failed to set BSSID for scan\n",
2830                        dev->name);
2831
2832         /* TODO: start scan as soon as all nullfunc frames are ACKed */
2833         queue_delayed_work(local->hw.workqueue, &local->scan_work,
2834                            IEEE80211_CHANNEL_TIME);
2835
2836         return 0;
2837 }
2838
2839
2840 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
2841 {
2842         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2843         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2844         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2845
2846         if (sdata->type != IEEE80211_IF_TYPE_STA)
2847                 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
2848
2849         if (local->sta_scanning) {
2850                 if (local->scan_dev == dev)
2851                         return 0;
2852                 return -EBUSY;
2853         }
2854
2855         set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
2856         queue_work(local->hw.workqueue, &ifsta->work);
2857         return 0;
2858 }
2859
2860 static char *
2861 ieee80211_sta_scan_result(struct net_device *dev,
2862                           struct ieee80211_sta_bss *bss,
2863                           char *current_ev, char *end_buf)
2864 {
2865         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2866         struct iw_event iwe;
2867
2868         if (time_after(jiffies,
2869                        bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
2870                 return current_ev;
2871
2872         if (!(local->enabled_modes & (1 << bss->hw_mode)))
2873                 return current_ev;
2874
2875         if (local->scan_flags & IEEE80211_SCAN_WPA_ONLY &&
2876             !bss->wpa_ie && !bss->rsn_ie)
2877                 return current_ev;
2878
2879         if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID &&
2880             (local->scan_ssid_len != bss->ssid_len ||
2881              memcmp(local->scan_ssid, bss->ssid, bss->ssid_len) != 0))
2882                 return current_ev;
2883
2884         memset(&iwe, 0, sizeof(iwe));
2885         iwe.cmd = SIOCGIWAP;
2886         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2887         memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2888         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2889                                           IW_EV_ADDR_LEN);
2890
2891         memset(&iwe, 0, sizeof(iwe));
2892         iwe.cmd = SIOCGIWESSID;
2893         iwe.u.data.length = bss->ssid_len;
2894         iwe.u.data.flags = 1;
2895         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2896                                           bss->ssid);
2897
2898         if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)) {
2899                 memset(&iwe, 0, sizeof(iwe));
2900                 iwe.cmd = SIOCGIWMODE;
2901                 if (bss->capability & WLAN_CAPABILITY_ESS)
2902                         iwe.u.mode = IW_MODE_MASTER;
2903                 else
2904                         iwe.u.mode = IW_MODE_ADHOC;
2905                 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2906                                                   IW_EV_UINT_LEN);
2907         }
2908
2909         memset(&iwe, 0, sizeof(iwe));
2910         iwe.cmd = SIOCGIWFREQ;
2911         iwe.u.freq.m = bss->channel;
2912         iwe.u.freq.e = 0;
2913         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2914                                           IW_EV_FREQ_LEN);
2915         iwe.u.freq.m = bss->freq * 100000;
2916         iwe.u.freq.e = 1;
2917         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2918                                           IW_EV_FREQ_LEN);
2919
2920         memset(&iwe, 0, sizeof(iwe));
2921         iwe.cmd = IWEVQUAL;
2922         iwe.u.qual.qual = bss->signal;
2923         iwe.u.qual.level = bss->rssi;
2924         iwe.u.qual.noise = bss->noise;
2925         iwe.u.qual.updated = local->wstats_flags;
2926         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2927                                           IW_EV_QUAL_LEN);
2928
2929         memset(&iwe, 0, sizeof(iwe));
2930         iwe.cmd = SIOCGIWENCODE;
2931         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
2932                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2933         else
2934                 iwe.u.data.flags = IW_ENCODE_DISABLED;
2935         iwe.u.data.length = 0;
2936         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, "");
2937
2938         if (bss && bss->wpa_ie) {
2939                 memset(&iwe, 0, sizeof(iwe));
2940                 iwe.cmd = IWEVGENIE;
2941                 iwe.u.data.length = bss->wpa_ie_len;
2942                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2943                                                   bss->wpa_ie);
2944         }
2945
2946         if (bss && bss->rsn_ie) {
2947                 memset(&iwe, 0, sizeof(iwe));
2948                 iwe.cmd = IWEVGENIE;
2949                 iwe.u.data.length = bss->rsn_ie_len;
2950                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2951                                                   bss->rsn_ie);
2952         }
2953
2954         if (bss && bss->supp_rates_len > 0) {
2955                 /* display all supported rates in readable format */
2956                 char *p = current_ev + IW_EV_LCP_LEN;
2957                 int i;
2958
2959                 memset(&iwe, 0, sizeof(iwe));
2960                 iwe.cmd = SIOCGIWRATE;
2961                 /* Those two flags are ignored... */
2962                 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2963
2964                 for (i = 0; i < bss->supp_rates_len; i++) {
2965                         iwe.u.bitrate.value = ((bss->supp_rates[i] &
2966                                                         0x7f) * 500000);
2967                         p = iwe_stream_add_value(current_ev, p,
2968                                         end_buf, &iwe, IW_EV_PARAM_LEN);
2969                 }
2970                 current_ev = p;
2971         }
2972
2973         if (bss) {
2974                 char *buf;
2975                 buf = kmalloc(30, GFP_ATOMIC);
2976                 if (buf) {
2977                         memset(&iwe, 0, sizeof(iwe));
2978                         iwe.cmd = IWEVCUSTOM;
2979                         sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
2980                         iwe.u.data.length = strlen(buf);
2981                         current_ev = iwe_stream_add_point(current_ev, end_buf,
2982                                                           &iwe, buf);
2983                         kfree(buf);
2984                 }
2985         }
2986
2987         do {
2988                 char *buf;
2989
2990                 if (!(local->scan_flags & IEEE80211_SCAN_EXTRA_INFO))
2991                         break;
2992
2993                 buf = kmalloc(100, GFP_ATOMIC);
2994                 if (!buf)
2995                         break;
2996
2997                 memset(&iwe, 0, sizeof(iwe));
2998                 iwe.cmd = IWEVCUSTOM;
2999                 sprintf(buf, "bcn_int=%d", bss->beacon_int);
3000                 iwe.u.data.length = strlen(buf);
3001                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3002                                                   buf);
3003
3004                 memset(&iwe, 0, sizeof(iwe));
3005                 iwe.cmd = IWEVCUSTOM;
3006                 sprintf(buf, "capab=0x%04x", bss->capability);
3007                 iwe.u.data.length = strlen(buf);
3008                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3009                                                   buf);
3010
3011                 kfree(buf);
3012                 break;
3013         } while (0);
3014
3015         return current_ev;
3016 }
3017
3018
3019 int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len)
3020 {
3021         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3022         char *current_ev = buf;
3023         char *end_buf = buf + len;
3024         struct ieee80211_sta_bss *bss;
3025
3026         spin_lock_bh(&local->sta_bss_lock);
3027         list_for_each_entry(bss, &local->sta_bss_list, list) {
3028                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3029                         spin_unlock_bh(&local->sta_bss_lock);
3030                         return -E2BIG;
3031                 }
3032                 current_ev = ieee80211_sta_scan_result(dev, bss, current_ev,
3033                                                        end_buf);
3034         }
3035         spin_unlock_bh(&local->sta_bss_lock);
3036         return current_ev - buf;
3037 }
3038
3039
3040 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
3041 {
3042         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3043         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3044         kfree(ifsta->extra_ie);
3045         if (len == 0) {
3046                 ifsta->extra_ie = NULL;
3047                 ifsta->extra_ie_len = 0;
3048                 return 0;
3049         }
3050         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
3051         if (!ifsta->extra_ie) {
3052                 ifsta->extra_ie_len = 0;
3053                 return -ENOMEM;
3054         }
3055         memcpy(ifsta->extra_ie, ie, len);
3056         ifsta->extra_ie_len = len;
3057         return 0;
3058 }
3059
3060
3061 struct sta_info * ieee80211_ibss_add_sta(struct net_device *dev,
3062                                          struct sk_buff *skb, u8 *bssid,
3063                                          u8 *addr)
3064 {
3065         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3066         struct sta_info *sta;
3067         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3068
3069         /* TODO: Could consider removing the least recently used entry and
3070          * allow new one to be added. */
3071         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
3072                 if (net_ratelimit()) {
3073                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
3074                                "entry " MAC_FMT "\n", dev->name, MAC_ARG(addr));
3075                 }
3076                 return NULL;
3077         }
3078
3079         printk(KERN_DEBUG "%s: Adding new IBSS station " MAC_FMT " (dev=%s)\n",
3080                local->mdev->name, MAC_ARG(addr), dev->name);
3081
3082         sta = sta_info_add(local, dev, addr, GFP_ATOMIC);
3083         if (!sta)
3084                 return NULL;
3085
3086         sta->supp_rates = sdata->u.sta.supp_rates_bits;
3087
3088         rate_control_rate_init(sta, local);
3089
3090         return sta; /* caller will call sta_info_put() */
3091 }
3092
3093
3094 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
3095 {
3096         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3097         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3098
3099         printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
3100                dev->name, reason);
3101
3102         if (sdata->type != IEEE80211_IF_TYPE_STA &&
3103             sdata->type != IEEE80211_IF_TYPE_IBSS)
3104                 return -EINVAL;
3105
3106         ieee80211_send_deauth(dev, ifsta, reason);
3107         ieee80211_set_disassoc(dev, ifsta, 1);
3108         return 0;
3109 }
3110
3111
3112 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
3113 {
3114         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3115         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3116
3117         printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
3118                dev->name, reason);
3119
3120         if (sdata->type != IEEE80211_IF_TYPE_STA)
3121                 return -EINVAL;
3122
3123         if (!ifsta->associated)
3124                 return -1;
3125
3126         ieee80211_send_disassoc(dev, ifsta, reason);
3127         ieee80211_set_disassoc(dev, ifsta, 0);
3128         return 0;
3129 }