net/mac80211/ieee80211_sta.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 /* TODO:
  15  * order BSS list by RSSI(?) ("quality of AP")
  16  * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
  17  *    SSID)
  18  */
  19 #include <linux/delay.h>
  20 #include <linux/if_ether.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/wireless.h>
  25 #include <linux/random.h>
  26 #include <linux/etherdevice.h>
  27 #include <net/iw_handler.h>
  28 #include <asm/types.h>
  29
  30 #include <net/mac80211.h>
  31 #include "ieee80211_i.h"
  32 #include "ieee80211_rate.h"
  33 #include "ieee80211_led.h"
  34
  35 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  36 #define IEEE80211_AUTH_MAX_TRIES 3
  37 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  38 #define IEEE80211_ASSOC_MAX_TRIES 3
  39 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  40 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  41 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  42 #define IEEE80211_SCAN_INTERVAL (2 * HZ)
  43 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
  44 #define IEEE80211_IBSS_JOIN_TIMEOUT (20 * HZ)
  45
  46 #define IEEE80211_PROBE_DELAY (HZ / 33)
  47 #define IEEE80211_CHANNEL_TIME (HZ / 33)
  48 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
  49 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
  50 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
  51 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
  52
  53 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128
  54
  55
  56 #define IEEE80211_FC(type, stype) cpu_to_le16(type | stype)
  57
  58 #define ERP_INFO_USE_PROTECTION BIT(1)
  59
  60 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
  61                                      u8 *ssid, size_t ssid_len);
  62 static struct ieee80211_sta_bss *
  63 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
  64                      u8 *ssid, u8 ssid_len);
  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 static void ieee802_11_parse_elems(u8 *start, size_t len,
 112                                    struct ieee802_11_elems *elems)
 113 {
 114         size_t left = len;
 115         u8 *pos = start;
 116
 117         memset(elems, 0, sizeof(*elems));
 118
 119         while (left >= 2) {
 120                 u8 id, elen;
 121
 122                 id = *pos++;
 123                 elen = *pos++;
 124                 left -= 2;
 125
 126                 if (elen > left)
 127                         return;
 128
 129                 switch (id) {
 130                 case WLAN_EID_SSID:
 131                         elems->ssid = pos;
 132                         elems->ssid_len = elen;
 133                         break;
 134                 case WLAN_EID_SUPP_RATES:
 135                         elems->supp_rates = pos;
 136                         elems->supp_rates_len = elen;
 137                         break;
 138                 case WLAN_EID_FH_PARAMS:
 139                         elems->fh_params = pos;
 140                         elems->fh_params_len = elen;
 141                         break;
 142                 case WLAN_EID_DS_PARAMS:
 143                         elems->ds_params = pos;
 144                         elems->ds_params_len = elen;
 145                         break;
 146                 case WLAN_EID_CF_PARAMS:
 147                         elems->cf_params = pos;
 148                         elems->cf_params_len = elen;
 149                         break;
 150                 case WLAN_EID_TIM:
 151                         elems->tim = pos;
 152                         elems->tim_len = elen;
 153                         break;
 154                 case WLAN_EID_IBSS_PARAMS:
 155                         elems->ibss_params = pos;
 156                         elems->ibss_params_len = elen;
 157                         break;
 158                 case WLAN_EID_CHALLENGE:
 159                         elems->challenge = pos;
 160                         elems->challenge_len = elen;
 161                         break;
 162                 case WLAN_EID_WPA:
 163                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 164                             pos[2] == 0xf2) {
 165                                 /* Microsoft OUI (00:50:F2) */
 166                                 if (pos[3] == 1) {
 167                                         /* OUI Type 1 - WPA IE */
 168                                         elems->wpa = pos;
 169                                         elems->wpa_len = elen;
 170                                 } else if (elen >= 5 && pos[3] == 2) {
 171                                         if (pos[4] == 0) {
 172                                                 elems->wmm_info = pos;
 173                                                 elems->wmm_info_len = elen;
 174                                         } else if (pos[4] == 1) {
 175                                                 elems->wmm_param = pos;
 176                                                 elems->wmm_param_len = elen;
 177                                         }
 178                                 }
 179                         }
 180                         break;
 181                 case WLAN_EID_RSN:
 182                         elems->rsn = pos;
 183                         elems->rsn_len = elen;
 184                         break;
 185                 case WLAN_EID_ERP_INFO:
 186                         elems->erp_info = pos;
 187                         elems->erp_info_len = elen;
 188                         break;
 189                 case WLAN_EID_EXT_SUPP_RATES:
 190                         elems->ext_supp_rates = pos;
 191                         elems->ext_supp_rates_len = elen;
 192                         break;
 193                 default:
 194                         break;
 195                 }
 196
 197                 left -= elen;
 198                 pos += elen;
 199         }
 200 }
 201
 202
 203 static int ecw2cw(int ecw)
 204 {
 205         int cw = 1;
 206         while (ecw > 0) {
 207                 cw <<= 1;
 208                 ecw--;
 209         }
 210         return cw - 1;
 211 }
 212
 213 static void ieee80211_sta_wmm_params(struct net_device *dev,
 214                                      struct ieee80211_if_sta *ifsta,
 215                                      u8 *wmm_param, size_t wmm_param_len)
 216 {
 217         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 218         struct ieee80211_tx_queue_params params;
 219         size_t left;
 220         int count;
 221         u8 *pos;
 222
 223         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 224                 return;
 225         count = wmm_param[6] & 0x0f;
 226         if (count == ifsta->wmm_last_param_set)
 227                 return;
 228         ifsta->wmm_last_param_set = count;
 229
 230         pos = wmm_param + 8;
 231         left = wmm_param_len - 8;
 232
 233         memset(&params, 0, sizeof(params));
 234
 235         if (!local->ops->conf_tx)
 236                 return;
 237
 238         local->wmm_acm = 0;
 239         for (; left >= 4; left -= 4, pos += 4) {
 240                 int aci = (pos[0] >> 5) & 0x03;
 241                 int acm = (pos[0] >> 4) & 0x01;
 242                 int queue;
 243
 244                 switch (aci) {
 245                 case 1:
 246                         queue = IEEE80211_TX_QUEUE_DATA3;
 247                         if (acm) {
 248                                 local->wmm_acm |= BIT(0) | BIT(3);
 249                         }
 250                         break;
 251                 case 2:
 252                         queue = IEEE80211_TX_QUEUE_DATA1;
 253                         if (acm) {
 254                                 local->wmm_acm |= BIT(4) | BIT(5);
 255                         }
 256                         break;
 257                 case 3:
 258                         queue = IEEE80211_TX_QUEUE_DATA0;
 259                         if (acm) {
 260                                 local->wmm_acm |= BIT(6) | BIT(7);
 261                         }
 262                         break;
 263                 case 0:
 264                 default:
 265                         queue = IEEE80211_TX_QUEUE_DATA2;
 266                         if (acm) {
 267                                 local->wmm_acm |= BIT(1) | BIT(2);
 268                         }
 269                         break;
 270                 }
 271
 272                 params.aifs = pos[0] & 0x0f;
 273                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 274                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 275                 /* TXOP is in units of 32 usec; burst_time in 0.1 ms */
 276                 params.burst_time = (pos[2] | (pos[3] << 8)) * 32 / 100;
 277                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 278                        "cWmin=%d cWmax=%d burst=%d\n",
 279                        dev->name, queue, aci, acm, params.aifs, params.cw_min,
 280                        params.cw_max, params.burst_time);
 281                 /* TODO: handle ACM (block TX, fallback to next lowest allowed
 282                  * AC for now) */
 283                 if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 284                         printk(KERN_DEBUG "%s: failed to set TX queue "
 285                                "parameters for queue %d\n", dev->name, queue);
 286                 }
 287         }
 288 }
 289
 290
 291 static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
 292 {
 293         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 294         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 295         int use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
 296         int preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
 297         u8 changes = 0;
 298         DECLARE_MAC_BUF(mac);
 299
 300         if (use_protection != !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION)) {
 301                 if (net_ratelimit()) {
 302                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
 303                                "%s)\n",
 304                                dev->name,
 305                                use_protection ? "enabled" : "disabled",
 306                                print_mac(mac, ifsta->bssid));
 307                 }
 308                 if (use_protection)
 309                         sdata->flags |= IEEE80211_SDATA_USE_PROTECTION;
 310                 else
 311                         sdata->flags &= ~IEEE80211_SDATA_USE_PROTECTION;
 312                 changes |= IEEE80211_ERP_CHANGE_PROTECTION;
 313         }
 314
 315         if (preamble_mode != !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE)) {
 316                 if (net_ratelimit()) {
 317                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 318                                " (BSSID=%s)\n",
 319                                dev->name,
 320                                (preamble_mode == WLAN_ERP_PREAMBLE_SHORT) ?
 321                                         "short" : "long",
 322                                print_mac(mac, ifsta->bssid));
 323                 }
 324                 if (preamble_mode)
 325                         sdata->flags &= ~IEEE80211_SDATA_SHORT_PREAMBLE;
 326                 else
 327                         sdata->flags |= IEEE80211_SDATA_SHORT_PREAMBLE;
 328                 changes |= IEEE80211_ERP_CHANGE_PREAMBLE;
 329         }
 330
 331         if (changes)
 332                 ieee80211_erp_info_change_notify(dev, changes);
 333 }
 334
 335
 336 static void ieee80211_sta_send_associnfo(struct net_device *dev,
 337                                          struct ieee80211_if_sta *ifsta)
 338 {
 339         char *buf;
 340         size_t len;
 341         int i;
 342         union iwreq_data wrqu;
 343
 344         if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
 345                 return;
 346
 347         buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
 348                                 ifsta->assocresp_ies_len), GFP_KERNEL);
 349         if (!buf)
 350                 return;
 351
 352         len = sprintf(buf, "ASSOCINFO(");
 353         if (ifsta->assocreq_ies) {
 354                 len += sprintf(buf + len, "ReqIEs=");
 355                 for (i = 0; i < ifsta->assocreq_ies_len; i++) {
 356                         len += sprintf(buf + len, "%02x",
 357                                        ifsta->assocreq_ies[i]);
 358                 }
 359         }
 360         if (ifsta->assocresp_ies) {
 361                 if (ifsta->assocreq_ies)
 362                         len += sprintf(buf + len, " ");
 363                 len += sprintf(buf + len, "RespIEs=");
 364                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 365                         len += sprintf(buf + len, "%02x",
 366                                        ifsta->assocresp_ies[i]);
 367                 }
 368         }
 369         len += sprintf(buf + len, ")");
 370
 371         if (len > IW_CUSTOM_MAX) {
 372                 len = sprintf(buf, "ASSOCRESPIE=");
 373                 for (i = 0; i < ifsta->assocresp_ies_len; i++) {
 374                         len += sprintf(buf + len, "%02x",
 375                                        ifsta->assocresp_ies[i]);
 376                 }
 377         }
 378
 379         memset(&wrqu, 0, sizeof(wrqu));
 380         wrqu.data.length = len;
 381         wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
 382
 383         kfree(buf);
 384 }
 385
 386
 387 static void ieee80211_set_associated(struct net_device *dev,
 388                                      struct ieee80211_if_sta *ifsta,
 389                                      bool assoc)
 390 {
 391         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 392         union iwreq_data wrqu;
 393
 394         if (!!(ifsta->flags & IEEE80211_STA_ASSOCIATED) == assoc)
 395                 return;
 396
 397         if (assoc) {
 398                 struct ieee80211_sub_if_data *sdata;
 399                 struct ieee80211_sta_bss *bss;
 400
 401                 ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 402
 403                 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 404                 if (sdata->type != IEEE80211_IF_TYPE_STA)
 405                         return;
 406
 407                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
 408                                            local->hw.conf.channel,
 409                                            ifsta->ssid, ifsta->ssid_len);
 410                 if (bss) {
 411                         if (bss->has_erp_value)
 412                                 ieee80211_handle_erp_ie(dev, bss->erp_value);
 413                         ieee80211_rx_bss_put(dev, bss);
 414                 }
 415
 416                 netif_carrier_on(dev);
 417                 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
 418                 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
 419                 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
 420                 ieee80211_sta_send_associnfo(dev, ifsta);
 421         } else {
 422                 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
 423
 424                 netif_carrier_off(dev);
 425                 ieee80211_reset_erp_info(dev);
 426                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 427         }
 428         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 429         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 430         ifsta->last_probe = jiffies;
 431         ieee80211_led_assoc(local, assoc);
 432 }
 433
 434 static void ieee80211_set_disassoc(struct net_device *dev,
 435                                    struct ieee80211_if_sta *ifsta, int deauth)
 436 {
 437         if (deauth)
 438                 ifsta->auth_tries = 0;
 439         ifsta->assoc_tries = 0;
 440         ieee80211_set_associated(dev, ifsta, 0);
 441 }
 442
 443 static void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
 444                              int encrypt)
 445 {
 446         struct ieee80211_sub_if_data *sdata;
 447         struct ieee80211_tx_packet_data *pkt_data;
 448
 449         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 450         skb->dev = sdata->local->mdev;
 451         skb_set_mac_header(skb, 0);
 452         skb_set_network_header(skb, 0);
 453         skb_set_transport_header(skb, 0);
 454
 455         pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
 456         memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
 457         pkt_data->ifindex = sdata->dev->ifindex;
 458         if (!encrypt)
 459                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 460
 461         dev_queue_xmit(skb);
 462 }
 463
 464
 465 static void ieee80211_send_auth(struct net_device *dev,
 466                                 struct ieee80211_if_sta *ifsta,
 467                                 int transaction, u8 *extra, size_t extra_len,
 468                                 int encrypt)
 469 {
 470         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 471         struct sk_buff *skb;
 472         struct ieee80211_mgmt *mgmt;
 473
 474         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 475                             sizeof(*mgmt) + 6 + extra_len);
 476         if (!skb) {
 477                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 478                        "frame\n", dev->name);
 479                 return;
 480         }
 481         skb_reserve(skb, local->hw.extra_tx_headroom);
 482
 483         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 484         memset(mgmt, 0, 24 + 6);
 485         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 486                                            IEEE80211_STYPE_AUTH);
 487         if (encrypt)
 488                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 489         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 490         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 491         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 492         mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
 493         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 494         ifsta->auth_transaction = transaction + 1;
 495         mgmt->u.auth.status_code = cpu_to_le16(0);
 496         if (extra)
 497                 memcpy(skb_put(skb, extra_len), extra, extra_len);
 498
 499         ieee80211_sta_tx(dev, skb, encrypt);
 500 }
 501
 502
 503 static void ieee80211_authenticate(struct net_device *dev,
 504                                    struct ieee80211_if_sta *ifsta)
 505 {
 506         DECLARE_MAC_BUF(mac);
 507
 508         ifsta->auth_tries++;
 509         if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 510                 printk(KERN_DEBUG "%s: authentication with AP %s"
 511                        " timed out\n",
 512                        dev->name, print_mac(mac, ifsta->bssid));
 513                 ifsta->state = IEEE80211_DISABLED;
 514                 return;
 515         }
 516
 517         ifsta->state = IEEE80211_AUTHENTICATE;
 518         printk(KERN_DEBUG "%s: authenticate with AP %s\n",
 519                dev->name, print_mac(mac, ifsta->bssid));
 520
 521         ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);
 522
 523         mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 524 }
 525
 526
 527 static void ieee80211_send_assoc(struct net_device *dev,
 528                                  struct ieee80211_if_sta *ifsta)
 529 {
 530         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 531         struct ieee80211_hw_mode *mode;
 532         struct sk_buff *skb;
 533         struct ieee80211_mgmt *mgmt;
 534         u8 *pos, *ies;
 535         int i, len;
 536         u16 capab;
 537         struct ieee80211_sta_bss *bss;
 538         int wmm = 0;
 539
 540         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 541                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
 542                             ifsta->ssid_len);
 543         if (!skb) {
 544                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 545                        "frame\n", dev->name);
 546                 return;
 547         }
 548         skb_reserve(skb, local->hw.extra_tx_headroom);
 549
 550         mode = local->oper_hw_mode;
 551         capab = ifsta->capab;
 552         if (mode->mode == MODE_IEEE80211G) {
 553                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
 554                         WLAN_CAPABILITY_SHORT_PREAMBLE;
 555         }
 556         bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
 557                                    ifsta->ssid, ifsta->ssid_len);
 558         if (bss) {
 559                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
 560                         capab |= WLAN_CAPABILITY_PRIVACY;
 561                 if (bss->wmm_ie) {
 562                         wmm = 1;
 563                 }
 564                 ieee80211_rx_bss_put(dev, bss);
 565         }
 566
 567         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 568         memset(mgmt, 0, 24);
 569         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 570         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 571         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 572
 573         if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
 574                 skb_put(skb, 10);
 575                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 576                                                    IEEE80211_STYPE_REASSOC_REQ);
 577                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 578                 mgmt->u.reassoc_req.listen_interval = cpu_to_le16(1);
 579                 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
 580                        ETH_ALEN);
 581         } else {
 582                 skb_put(skb, 4);
 583                 mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 584                                                    IEEE80211_STYPE_ASSOC_REQ);
 585                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 586                 mgmt->u.assoc_req.listen_interval = cpu_to_le16(1);
 587         }
 588
 589         /* SSID */
 590         ies = pos = skb_put(skb, 2 + ifsta->ssid_len);
 591         *pos++ = WLAN_EID_SSID;
 592         *pos++ = ifsta->ssid_len;
 593         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 594
 595         len = mode->num_rates;
 596         if (len > 8)
 597                 len = 8;
 598         pos = skb_put(skb, len + 2);
 599         *pos++ = WLAN_EID_SUPP_RATES;
 600         *pos++ = len;
 601         for (i = 0; i < len; i++) {
 602                 int rate = mode->rates[i].rate;
 603                 *pos++ = (u8) (rate / 5);
 604         }
 605
 606         if (mode->num_rates > len) {
 607                 pos = skb_put(skb, mode->num_rates - len + 2);
 608                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 609                 *pos++ = mode->num_rates - len;
 610                 for (i = len; i < mode->num_rates; i++) {
 611                         int rate = mode->rates[i].rate;
 612                         *pos++ = (u8) (rate / 5);
 613                 }
 614         }
 615
 616         if (ifsta->extra_ie) {
 617                 pos = skb_put(skb, ifsta->extra_ie_len);
 618                 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
 619         }
 620
 621         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
 622                 pos = skb_put(skb, 9);
 623                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 624                 *pos++ = 7; /* len */
 625                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 626                 *pos++ = 0x50;
 627                 *pos++ = 0xf2;
 628                 *pos++ = 2; /* WME */
 629                 *pos++ = 0; /* WME info */
 630                 *pos++ = 1; /* WME ver */
 631                 *pos++ = 0;
 632         }
 633
 634         kfree(ifsta->assocreq_ies);
 635         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
 636         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
 637         if (ifsta->assocreq_ies)
 638                 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);
 639
 640         ieee80211_sta_tx(dev, skb, 0);
 641 }
 642
 643
 644 static void ieee80211_send_deauth(struct net_device *dev,
 645                                   struct ieee80211_if_sta *ifsta, u16 reason)
 646 {
 647         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 648         struct sk_buff *skb;
 649         struct ieee80211_mgmt *mgmt;
 650
 651         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 652         if (!skb) {
 653                 printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
 654                        "frame\n", dev->name);
 655                 return;
 656         }
 657         skb_reserve(skb, local->hw.extra_tx_headroom);
 658
 659         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 660         memset(mgmt, 0, 24);
 661         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 662         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 663         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 664         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 665                                            IEEE80211_STYPE_DEAUTH);
 666         skb_put(skb, 2);
 667         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 668
 669         ieee80211_sta_tx(dev, skb, 0);
 670 }
 671
 672
 673 static void ieee80211_send_disassoc(struct net_device *dev,
 674                                     struct ieee80211_if_sta *ifsta, u16 reason)
 675 {
 676         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 677         struct sk_buff *skb;
 678         struct ieee80211_mgmt *mgmt;
 679
 680         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 681         if (!skb) {
 682                 printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
 683                        "frame\n", dev->name);
 684                 return;
 685         }
 686         skb_reserve(skb, local->hw.extra_tx_headroom);
 687
 688         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 689         memset(mgmt, 0, 24);
 690         memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
 691         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 692         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
 693         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 694                                            IEEE80211_STYPE_DISASSOC);
 695         skb_put(skb, 2);
 696         mgmt->u.disassoc.reason_code = cpu_to_le16(reason);
 697
 698         ieee80211_sta_tx(dev, skb, 0);
 699 }
 700
 701
 702 static int ieee80211_privacy_mismatch(struct net_device *dev,
 703                                       struct ieee80211_if_sta *ifsta)
 704 {
 705         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 706         struct ieee80211_sta_bss *bss;
 707         int res = 0;
 708
 709         if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL) ||
 710             ifsta->key_management_enabled)
 711                 return 0;
 712
 713         bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
 714                                    ifsta->ssid, ifsta->ssid_len);
 715         if (!bss)
 716                 return 0;
 717
 718         if (ieee80211_sta_wep_configured(dev) !=
 719             !!(bss->capability & WLAN_CAPABILITY_PRIVACY))
 720                 res = 1;
 721
 722         ieee80211_rx_bss_put(dev, bss);
 723
 724         return res;
 725 }
 726
 727
 728 static void ieee80211_associate(struct net_device *dev,
 729                                 struct ieee80211_if_sta *ifsta)
 730 {
 731         DECLARE_MAC_BUF(mac);
 732
 733         ifsta->assoc_tries++;
 734         if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 735                 printk(KERN_DEBUG "%s: association with AP %s"
 736                        " timed out\n",
 737                        dev->name, print_mac(mac, ifsta->bssid));
 738                 ifsta->state = IEEE80211_DISABLED;
 739                 return;
 740         }
 741
 742         ifsta->state = IEEE80211_ASSOCIATE;
 743         printk(KERN_DEBUG "%s: associate with AP %s\n",
 744                dev->name, print_mac(mac, ifsta->bssid));
 745         if (ieee80211_privacy_mismatch(dev, ifsta)) {
 746                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 747                        "mixed-cell disabled - abort association\n", dev->name);
 748                 ifsta->state = IEEE80211_DISABLED;
 749                 return;
 750         }
 751
 752         ieee80211_send_assoc(dev, ifsta);
 753
 754         mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 755 }
 756
 757
 758 static void ieee80211_associated(struct net_device *dev,
 759                                  struct ieee80211_if_sta *ifsta)
 760 {
 761         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 762         struct sta_info *sta;
 763         int disassoc;
 764         DECLARE_MAC_BUF(mac);
 765
 766         /* TODO: start monitoring current AP signal quality and number of
 767          * missed beacons. Scan other channels every now and then and search
 768          * for better APs. */
 769         /* TODO: remove expired BSSes */
 770
 771         ifsta->state = IEEE80211_ASSOCIATED;
 772
 773         sta = sta_info_get(local, ifsta->bssid);
 774         if (!sta) {
 775                 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
 776                        dev->name, print_mac(mac, ifsta->bssid));
 777                 disassoc = 1;
 778         } else {
 779                 disassoc = 0;
 780                 if (time_after(jiffies,
 781                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 782                         if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
 783                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 784                                        "current AP %s - assume out of "
 785                                        "range\n",
 786                                        dev->name, print_mac(mac, ifsta->bssid));
 787                                 disassoc = 1;
 788                                 sta_info_free(sta);
 789                         } else
 790                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 791                                                          local->scan_ssid,
 792                                                          local->scan_ssid_len);
 793                         ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 794                 } else {
 795                         ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 796                         if (time_after(jiffies, ifsta->last_probe +
 797                                        IEEE80211_PROBE_INTERVAL)) {
 798                                 ifsta->last_probe = jiffies;
 799                                 ieee80211_send_probe_req(dev, ifsta->bssid,
 800                                                          ifsta->ssid,
 801                                                          ifsta->ssid_len);
 802                         }
 803                 }
 804                 sta_info_put(sta);
 805         }
 806         if (disassoc) {
 807                 union iwreq_data wrqu;
 808                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 809                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 810                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 811                 mod_timer(&ifsta->timer, jiffies +
 812                                       IEEE80211_MONITORING_INTERVAL + 30 * HZ);
 813         } else {
 814                 mod_timer(&ifsta->timer, jiffies +
 815                                       IEEE80211_MONITORING_INTERVAL);
 816         }
 817 }
 818
 819
 820 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
 821                                      u8 *ssid, size_t ssid_len)
 822 {
 823         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 824         struct ieee80211_hw_mode *mode;
 825         struct sk_buff *skb;
 826         struct ieee80211_mgmt *mgmt;
 827         u8 *pos, *supp_rates, *esupp_rates = NULL;
 828         int i;
 829
 830         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
 831         if (!skb) {
 832                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 833                        "request\n", dev->name);
 834                 return;
 835         }
 836         skb_reserve(skb, local->hw.extra_tx_headroom);
 837
 838         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 839         memset(mgmt, 0, 24);
 840         mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
 841                                            IEEE80211_STYPE_PROBE_REQ);
 842         memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
 843         if (dst) {
 844                 memcpy(mgmt->da, dst, ETH_ALEN);
 845                 memcpy(mgmt->bssid, dst, ETH_ALEN);
 846         } else {
 847                 memset(mgmt->da, 0xff, ETH_ALEN);
 848                 memset(mgmt->bssid, 0xff, ETH_ALEN);
 849         }
 850         pos = skb_put(skb, 2 + ssid_len);
 851         *pos++ = WLAN_EID_SSID;
 852         *pos++ = ssid_len;
 853         memcpy(pos, ssid, ssid_len);
 854
 855         supp_rates = skb_put(skb, 2);
 856         supp_rates[0] = WLAN_EID_SUPP_RATES;
 857         supp_rates[1] = 0;
 858         mode = local->oper_hw_mode;
 859         for (i = 0; i < mode->num_rates; i++) {
 860                 struct ieee80211_rate *rate = &mode->rates[i];
 861                 if (!(rate->flags & IEEE80211_RATE_SUPPORTED))
 862                         continue;
 863                 if (esupp_rates) {
 864                         pos = skb_put(skb, 1);
 865                         esupp_rates[1]++;
 866                 } else if (supp_rates[1] == 8) {
 867                         esupp_rates = skb_put(skb, 3);
 868                         esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 869                         esupp_rates[1] = 1;
 870                         pos = &esupp_rates[2];
 871                 } else {
 872                         pos = skb_put(skb, 1);
 873                         supp_rates[1]++;
 874                 }
 875                 *pos = rate->rate / 5;
 876         }
 877
 878         ieee80211_sta_tx(dev, skb, 0);
 879 }
 880
 881
 882 static int ieee80211_sta_wep_configured(struct net_device *dev)
 883 {
 884         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 885         if (!sdata || !sdata->default_key ||
 886             sdata->default_key->conf.alg != ALG_WEP)
 887                 return 0;
 888         return 1;
 889 }
 890
 891
 892 static void ieee80211_auth_completed(struct net_device *dev,
 893                                      struct ieee80211_if_sta *ifsta)
 894 {
 895         printk(KERN_DEBUG "%s: authenticated\n", dev->name);
 896         ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
 897         ieee80211_associate(dev, ifsta);
 898 }
 899
 900
 901 static void ieee80211_auth_challenge(struct net_device *dev,
 902                                      struct ieee80211_if_sta *ifsta,
 903                                      struct ieee80211_mgmt *mgmt,
 904                                      size_t len)
 905 {
 906         u8 *pos;
 907         struct ieee802_11_elems elems;
 908
 909         printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
 910         pos = mgmt->u.auth.variable;
 911         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
 912         if (!elems.challenge) {
 913                 printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
 914                        "frame\n", dev->name);
 915                 return;
 916         }
 917         ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
 918                             elems.challenge_len + 2, 1);
 919 }
 920
 921
 922 static void ieee80211_rx_mgmt_auth(struct net_device *dev,
 923                                    struct ieee80211_if_sta *ifsta,
 924                                    struct ieee80211_mgmt *mgmt,
 925                                    size_t len)
 926 {
 927         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 928         u16 auth_alg, auth_transaction, status_code;
 929         DECLARE_MAC_BUF(mac);
 930
 931         if (ifsta->state != IEEE80211_AUTHENTICATE &&
 932             sdata->type != IEEE80211_IF_TYPE_IBSS) {
 933                 printk(KERN_DEBUG "%s: authentication frame received from "
 934                        "%s, but not in authenticate state - ignored\n",
 935                        dev->name, print_mac(mac, mgmt->sa));
 936                 return;
 937         }
 938
 939         if (len < 24 + 6) {
 940                 printk(KERN_DEBUG "%s: too short (%zd) authentication frame "
 941                        "received from %s - ignored\n",
 942                        dev->name, len, print_mac(mac, mgmt->sa));
 943                 return;
 944         }
 945
 946         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 947             memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
 948                 printk(KERN_DEBUG "%s: authentication frame received from "
 949                        "unknown AP (SA=%s BSSID=%s) - "
 950                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
 951                        print_mac(mac, mgmt->bssid));
 952                 return;
 953         }
 954
 955         if (sdata->type != IEEE80211_IF_TYPE_IBSS &&
 956             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) {
 957                 printk(KERN_DEBUG "%s: authentication frame received from "
 958                        "unknown BSSID (SA=%s BSSID=%s) - "
 959                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
 960                        print_mac(mac, mgmt->bssid));
 961                 return;
 962         }
 963
 964         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
 965         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
 966         status_code = le16_to_cpu(mgmt->u.auth.status_code);
 967
 968         printk(KERN_DEBUG "%s: RX authentication from %s (alg=%d "
 969                "transaction=%d status=%d)\n",
 970                dev->name, print_mac(mac, mgmt->sa), auth_alg,
 971                auth_transaction, status_code);
 972
 973         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
 974                 /* IEEE 802.11 standard does not require authentication in IBSS
 975                  * networks and most implementations do not seem to use it.
 976                  * However, try to reply to authentication attempts if someone
 977                  * has actually implemented this.
 978                  * TODO: Could implement shared key authentication. */
 979                 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) {
 980                         printk(KERN_DEBUG "%s: unexpected IBSS authentication "
 981                                "frame (alg=%d transaction=%d)\n",
 982                                dev->name, auth_alg, auth_transaction);
 983                         return;
 984                 }
 985                 ieee80211_send_auth(dev, ifsta, 2, NULL, 0, 0);
 986         }
 987
 988         if (auth_alg != ifsta->auth_alg ||
 989             auth_transaction != ifsta->auth_transaction) {
 990                 printk(KERN_DEBUG "%s: unexpected authentication frame "
 991                        "(alg=%d transaction=%d)\n",
 992                        dev->name, auth_alg, auth_transaction);
 993                 return;
 994         }
 995
 996         if (status_code != WLAN_STATUS_SUCCESS) {
 997                 printk(KERN_DEBUG "%s: AP denied authentication (auth_alg=%d "
 998                        "code=%d)\n", dev->name, ifsta->auth_alg, status_code);
 999                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1000                         u8 algs[3];
1001                         const int num_algs = ARRAY_SIZE(algs);
1002                         int i, pos;
1003                         algs[0] = algs[1] = algs[2] = 0xff;
1004                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1005                                 algs[0] = WLAN_AUTH_OPEN;
1006                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1007                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1008                         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1009                                 algs[2] = WLAN_AUTH_LEAP;
1010                         if (ifsta->auth_alg == WLAN_AUTH_OPEN)
1011                                 pos = 0;
1012                         else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
1013                                 pos = 1;
1014                         else
1015                                 pos = 2;
1016                         for (i = 0; i < num_algs; i++) {
1017                                 pos++;
1018                                 if (pos >= num_algs)
1019                                         pos = 0;
1020                                 if (algs[pos] == ifsta->auth_alg ||
1021                                     algs[pos] == 0xff)
1022                                         continue;
1023                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1024                                     !ieee80211_sta_wep_configured(dev))
1025                                         continue;
1026                                 ifsta->auth_alg = algs[pos];
1027                                 printk(KERN_DEBUG "%s: set auth_alg=%d for "
1028                                        "next try\n",
1029                                        dev->name, ifsta->auth_alg);
1030                                 break;
1031                         }
1032                 }
1033                 return;
1034         }
1035
1036         switch (ifsta->auth_alg) {
1037         case WLAN_AUTH_OPEN:
1038         case WLAN_AUTH_LEAP:
1039                 ieee80211_auth_completed(dev, ifsta);
1040                 break;
1041         case WLAN_AUTH_SHARED_KEY:
1042                 if (ifsta->auth_transaction == 4)
1043                         ieee80211_auth_completed(dev, ifsta);
1044                 else
1045                         ieee80211_auth_challenge(dev, ifsta, mgmt, len);
1046                 break;
1047         }
1048 }
1049
1050
1051 static void ieee80211_rx_mgmt_deauth(struct net_device *dev,
1052                                      struct ieee80211_if_sta *ifsta,
1053                                      struct ieee80211_mgmt *mgmt,
1054                                      size_t len)
1055 {
1056         u16 reason_code;
1057         DECLARE_MAC_BUF(mac);
1058
1059         if (len < 24 + 2) {
1060                 printk(KERN_DEBUG "%s: too short (%zd) deauthentication frame "
1061                        "received from %s - ignored\n",
1062                        dev->name, len, print_mac(mac, mgmt->sa));
1063                 return;
1064         }
1065
1066         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1067                 printk(KERN_DEBUG "%s: deauthentication frame received from "
1068                        "unknown AP (SA=%s BSSID=%s) - "
1069                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1070                        print_mac(mac, mgmt->bssid));
1071                 return;
1072         }
1073
1074         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1075
1076         printk(KERN_DEBUG "%s: RX deauthentication from %s"
1077                " (reason=%d)\n",
1078                dev->name, print_mac(mac, mgmt->sa), reason_code);
1079
1080         if (ifsta->flags & IEEE80211_STA_AUTHENTICATED) {
1081                 printk(KERN_DEBUG "%s: deauthenticated\n", dev->name);
1082         }
1083
1084         if (ifsta->state == IEEE80211_AUTHENTICATE ||
1085             ifsta->state == IEEE80211_ASSOCIATE ||
1086             ifsta->state == IEEE80211_ASSOCIATED) {
1087                 ifsta->state = IEEE80211_AUTHENTICATE;
1088                 mod_timer(&ifsta->timer, jiffies +
1089                                       IEEE80211_RETRY_AUTH_INTERVAL);
1090         }
1091
1092         ieee80211_set_disassoc(dev, ifsta, 1);
1093         ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1094 }
1095
1096
1097 static void ieee80211_rx_mgmt_disassoc(struct net_device *dev,
1098                                        struct ieee80211_if_sta *ifsta,
1099                                        struct ieee80211_mgmt *mgmt,
1100                                        size_t len)
1101 {
1102         u16 reason_code;
1103         DECLARE_MAC_BUF(mac);
1104
1105         if (len < 24 + 2) {
1106                 printk(KERN_DEBUG "%s: too short (%zd) disassociation frame "
1107                        "received from %s - ignored\n",
1108                        dev->name, len, print_mac(mac, mgmt->sa));
1109                 return;
1110         }
1111
1112         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1113                 printk(KERN_DEBUG "%s: disassociation frame received from "
1114                        "unknown AP (SA=%s BSSID=%s) - "
1115                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1116                        print_mac(mac, mgmt->bssid));
1117                 return;
1118         }
1119
1120         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1121
1122         printk(KERN_DEBUG "%s: RX disassociation from %s"
1123                " (reason=%d)\n",
1124                dev->name, print_mac(mac, mgmt->sa), reason_code);
1125
1126         if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1127                 printk(KERN_DEBUG "%s: disassociated\n", dev->name);
1128
1129         if (ifsta->state == IEEE80211_ASSOCIATED) {
1130                 ifsta->state = IEEE80211_ASSOCIATE;
1131                 mod_timer(&ifsta->timer, jiffies +
1132                                       IEEE80211_RETRY_AUTH_INTERVAL);
1133         }
1134
1135         ieee80211_set_disassoc(dev, ifsta, 0);
1136 }
1137
1138
1139 static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
1140                                          struct ieee80211_if_sta *ifsta,
1141                                          struct ieee80211_mgmt *mgmt,
1142                                          size_t len,
1143                                          int reassoc)
1144 {
1145         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1146         struct ieee80211_hw_mode *mode;
1147         struct sta_info *sta;
1148         u32 rates;
1149         u16 capab_info, status_code, aid;
1150         struct ieee802_11_elems elems;
1151         u8 *pos;
1152         int i, j;
1153         DECLARE_MAC_BUF(mac);
1154
1155         /* AssocResp and ReassocResp have identical structure, so process both
1156          * of them in this function. */
1157
1158         if (ifsta->state != IEEE80211_ASSOCIATE) {
1159                 printk(KERN_DEBUG "%s: association frame received from "
1160                        "%s, but not in associate state - ignored\n",
1161                        dev->name, print_mac(mac, mgmt->sa));
1162                 return;
1163         }
1164
1165         if (len < 24 + 6) {
1166                 printk(KERN_DEBUG "%s: too short (%zd) association frame "
1167                        "received from %s - ignored\n",
1168                        dev->name, len, print_mac(mac, mgmt->sa));
1169                 return;
1170         }
1171
1172         if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) {
1173                 printk(KERN_DEBUG "%s: association frame received from "
1174                        "unknown AP (SA=%s BSSID=%s) - "
1175                        "ignored\n", dev->name, print_mac(mac, mgmt->sa),
1176                        print_mac(mac, mgmt->bssid));
1177                 return;
1178         }
1179
1180         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1181         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1182         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1183
1184         printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1185                "status=%d aid=%d)\n",
1186                dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1187                capab_info, status_code, aid & ~(BIT(15) | BIT(14)));
1188
1189         if (status_code != WLAN_STATUS_SUCCESS) {
1190                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1191                        dev->name, status_code);
1192                 /* if this was a reassociation, ensure we try a "full"
1193                  * association next time. This works around some broken APs
1194                  * which do not correctly reject reassociation requests. */
1195                 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1196                 return;
1197         }
1198
1199         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1200                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1201                        "set\n", dev->name, aid);
1202         aid &= ~(BIT(15) | BIT(14));
1203
1204         pos = mgmt->u.assoc_resp.variable;
1205         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1206
1207         if (!elems.supp_rates) {
1208                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1209                        dev->name);
1210                 return;
1211         }
1212
1213         /* it probably doesn't, but if the frame includes an ERP value then
1214          * update our stored copy */
1215         if (elems.erp_info && elems.erp_info_len >= 1) {
1216                 struct ieee80211_sta_bss *bss
1217                         = ieee80211_rx_bss_get(dev, ifsta->bssid,
1218                                                local->hw.conf.channel,
1219                                                ifsta->ssid, ifsta->ssid_len);
1220                 if (bss) {
1221                         bss->erp_value = elems.erp_info[0];
1222                         bss->has_erp_value = 1;
1223                         ieee80211_rx_bss_put(dev, bss);
1224                 }
1225         }
1226
1227         printk(KERN_DEBUG "%s: associated\n", dev->name);
1228         ifsta->aid = aid;
1229         ifsta->ap_capab = capab_info;
1230
1231         kfree(ifsta->assocresp_ies);
1232         ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1233         ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL);
1234         if (ifsta->assocresp_ies)
1235                 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len);
1236
1237         ieee80211_set_associated(dev, ifsta, 1);
1238
1239         /* Add STA entry for the AP */
1240         sta = sta_info_get(local, ifsta->bssid);
1241         if (!sta) {
1242                 struct ieee80211_sta_bss *bss;
1243                 sta = sta_info_add(local, dev, ifsta->bssid, GFP_KERNEL);
1244                 if (!sta) {
1245                         printk(KERN_DEBUG "%s: failed to add STA entry for the"
1246                                " AP\n", dev->name);
1247                         return;
1248                 }
1249                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
1250                                            local->hw.conf.channel,
1251                                            ifsta->ssid, ifsta->ssid_len);
1252                 if (bss) {
1253                         sta->last_rssi = bss->rssi;
1254                         sta->last_signal = bss->signal;
1255                         sta->last_noise = bss->noise;
1256                         ieee80211_rx_bss_put(dev, bss);
1257                 }
1258         }
1259
1260         sta->dev = dev;
1261         sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP;
1262
1263         rates = 0;
1264         mode = local->oper_hw_mode;
1265         for (i = 0; i < elems.supp_rates_len; i++) {
1266                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1267                 for (j = 0; j < mode->num_rates; j++)
1268                         if (mode->rates[j].rate == rate)
1269                                 rates |= BIT(j);
1270         }
1271         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1272                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1273                 for (j = 0; j < mode->num_rates; j++)
1274                         if (mode->rates[j].rate == rate)
1275                                 rates |= BIT(j);
1276         }
1277         sta->supp_rates = rates;
1278
1279         rate_control_rate_init(sta, local);
1280
1281         if (elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1282                 sta->flags |= WLAN_STA_WME;
1283                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1284                                          elems.wmm_param_len);
1285         }
1286
1287
1288         sta_info_put(sta);
1289
1290         ieee80211_associated(dev, ifsta);
1291 }
1292
1293
1294 /* Caller must hold local->sta_bss_lock */
1295 static void __ieee80211_rx_bss_hash_add(struct net_device *dev,
1296                                         struct ieee80211_sta_bss *bss)
1297 {
1298         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1299         bss->hnext = local->sta_bss_hash[STA_HASH(bss->bssid)];
1300         local->sta_bss_hash[STA_HASH(bss->bssid)] = bss;
1301 }
1302
1303
1304 /* Caller must hold local->sta_bss_lock */
1305 static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
1306                                         struct ieee80211_sta_bss *bss)
1307 {
1308         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1309         struct ieee80211_sta_bss *b, *prev = NULL;
1310         b = local->sta_bss_hash[STA_HASH(bss->bssid)];
1311         while (b) {
1312                 if (b == bss) {
1313                         if (!prev)
1314                                 local->sta_bss_hash[STA_HASH(bss->bssid)] =
1315                                         bss->hnext;
1316                         else
1317                                 prev->hnext = bss->hnext;
1318                         break;
1319                 }
1320                 prev = b;
1321                 b = b->hnext;
1322         }
1323 }
1324
1325
1326 static struct ieee80211_sta_bss *
1327 ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel,
1328                      u8 *ssid, u8 ssid_len)
1329 {
1330         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1331         struct ieee80211_sta_bss *bss;
1332
1333         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
1334         if (!bss)
1335                 return NULL;
1336         atomic_inc(&bss->users);
1337         atomic_inc(&bss->users);
1338         memcpy(bss->bssid, bssid, ETH_ALEN);
1339         bss->channel = channel;
1340         if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
1341                 memcpy(bss->ssid, ssid, ssid_len);
1342                 bss->ssid_len = ssid_len;
1343         }
1344
1345         spin_lock_bh(&local->sta_bss_lock);
1346         /* TODO: order by RSSI? */
1347         list_add_tail(&bss->list, &local->sta_bss_list);
1348         __ieee80211_rx_bss_hash_add(dev, bss);
1349         spin_unlock_bh(&local->sta_bss_lock);
1350         return bss;
1351 }
1352
1353
1354 static struct ieee80211_sta_bss *
1355 ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
1356                      u8 *ssid, u8 ssid_len)
1357 {
1358         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1359         struct ieee80211_sta_bss *bss;
1360
1361         spin_lock_bh(&local->sta_bss_lock);
1362         bss = local->sta_bss_hash[STA_HASH(bssid)];
1363         while (bss) {
1364                 if (!memcmp(bss->bssid, bssid, ETH_ALEN) &&
1365                     bss->channel == channel &&
1366                     bss->ssid_len == ssid_len &&
1367                     (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
1368                         atomic_inc(&bss->users);
1369                         break;
1370                 }
1371                 bss = bss->hnext;
1372         }
1373         spin_unlock_bh(&local->sta_bss_lock);
1374         return bss;
1375 }
1376
1377
1378 static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
1379 {
1380         kfree(bss->wpa_ie);
1381         kfree(bss->rsn_ie);
1382         kfree(bss->wmm_ie);
1383         kfree(bss);
1384 }
1385
1386
1387 static void ieee80211_rx_bss_put(struct net_device *dev,
1388                                  struct ieee80211_sta_bss *bss)
1389 {
1390         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1391         if (!atomic_dec_and_test(&bss->users))
1392                 return;
1393
1394         spin_lock_bh(&local->sta_bss_lock);
1395         __ieee80211_rx_bss_hash_del(dev, bss);
1396         list_del(&bss->list);
1397         spin_unlock_bh(&local->sta_bss_lock);
1398         ieee80211_rx_bss_free(bss);
1399 }
1400
1401
1402 void ieee80211_rx_bss_list_init(struct net_device *dev)
1403 {
1404         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1405         spin_lock_init(&local->sta_bss_lock);
1406         INIT_LIST_HEAD(&local->sta_bss_list);
1407 }
1408
1409
1410 void ieee80211_rx_bss_list_deinit(struct net_device *dev)
1411 {
1412         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1413         struct ieee80211_sta_bss *bss, *tmp;
1414
1415         list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
1416                 ieee80211_rx_bss_put(dev, bss);
1417 }
1418
1419
1420 static void ieee80211_rx_bss_info(struct net_device *dev,
1421                                   struct ieee80211_mgmt *mgmt,
1422                                   size_t len,
1423                                   struct ieee80211_rx_status *rx_status,
1424                                   int beacon)
1425 {
1426         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1427         struct ieee802_11_elems elems;
1428         size_t baselen;
1429         int channel, clen;
1430         struct ieee80211_sta_bss *bss;
1431         struct sta_info *sta;
1432         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1433         u64 timestamp;
1434         DECLARE_MAC_BUF(mac);
1435         DECLARE_MAC_BUF(mac2);
1436
1437         if (!beacon && memcmp(mgmt->da, dev->dev_addr, ETH_ALEN))
1438                 return; /* ignore ProbeResp to foreign address */
1439
1440 #if 0
1441         printk(KERN_DEBUG "%s: RX %s from %s to %s\n",
1442                dev->name, beacon ? "Beacon" : "Probe Response",
1443                print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da));
1444 #endif
1445
1446         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1447         if (baselen > len)
1448                 return;
1449
1450         timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1451
1452         if (sdata->type == IEEE80211_IF_TYPE_IBSS && beacon &&
1453             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) {
1454 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1455                 static unsigned long last_tsf_debug = 0;
1456                 u64 tsf;
1457                 if (local->ops->get_tsf)
1458                         tsf = local->ops->get_tsf(local_to_hw(local));
1459                 else
1460                         tsf = -1LLU;
1461                 if (time_after(jiffies, last_tsf_debug + 5 * HZ)) {
1462                         printk(KERN_DEBUG "RX beacon SA=%s BSSID="
1463                                "%s TSF=0x%llx BCN=0x%llx diff=%lld "
1464                                "@%lu\n",
1465                                print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->bssid),
1466                                (unsigned long long)tsf,
1467                                (unsigned long long)timestamp,
1468                                (unsigned long long)(tsf - timestamp),
1469                                jiffies);
1470                         last_tsf_debug = jiffies;
1471                 }
1472 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1473         }
1474
1475         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1476
1477         if (sdata->type == IEEE80211_IF_TYPE_IBSS && elems.supp_rates &&
1478             memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0 &&
1479             (sta = sta_info_get(local, mgmt->sa))) {
1480                 struct ieee80211_hw_mode *mode;
1481                 struct ieee80211_rate *rates;
1482                 size_t num_rates;
1483                 u32 supp_rates, prev_rates;
1484                 int i, j;
1485
1486                 mode = local->sta_scanning ?
1487                        local->scan_hw_mode : local->oper_hw_mode;
1488                 rates = mode->rates;
1489                 num_rates = mode->num_rates;
1490
1491                 supp_rates = 0;
1492                 for (i = 0; i < elems.supp_rates_len +
1493                              elems.ext_supp_rates_len; i++) {
1494                         u8 rate = 0;
1495                         int own_rate;
1496                         if (i < elems.supp_rates_len)
1497                                 rate = elems.supp_rates[i];
1498                         else if (elems.ext_supp_rates)
1499                                 rate = elems.ext_supp_rates
1500                                         [i - elems.supp_rates_len];
1501                         own_rate = 5 * (rate & 0x7f);
1502                         for (j = 0; j < num_rates; j++)
1503                                 if (rates[j].rate == own_rate)
1504                                         supp_rates |= BIT(j);
1505                 }
1506
1507                 prev_rates = sta->supp_rates;
1508                 sta->supp_rates &= supp_rates;
1509                 if (sta->supp_rates == 0) {
1510                         /* No matching rates - this should not really happen.
1511                          * Make sure that at least one rate is marked
1512                          * supported to avoid issues with TX rate ctrl. */
1513                         sta->supp_rates = sdata->u.sta.supp_rates_bits;
1514                 }
1515                 if (sta->supp_rates != prev_rates) {
1516                         printk(KERN_DEBUG "%s: updated supp_rates set for "
1517                                "%s based on beacon info (0x%x & 0x%x -> "
1518                                "0x%x)\n",
1519                                dev->name, print_mac(mac, sta->addr), prev_rates,
1520                                supp_rates, sta->supp_rates);
1521                 }
1522                 sta_info_put(sta);
1523         }
1524
1525         if (!elems.ssid)
1526                 return;
1527
1528         if (elems.ds_params && elems.ds_params_len == 1)
1529                 channel = elems.ds_params[0];
1530         else
1531                 channel = rx_status->channel;
1532
1533         bss = ieee80211_rx_bss_get(dev, mgmt->bssid, channel,
1534                                    elems.ssid, elems.ssid_len);
1535         if (!bss) {
1536                 bss = ieee80211_rx_bss_add(dev, mgmt->bssid, channel,
1537                                            elems.ssid, elems.ssid_len);
1538                 if (!bss)
1539                         return;
1540         } else {
1541 #if 0
1542                 /* TODO: order by RSSI? */
1543                 spin_lock_bh(&local->sta_bss_lock);
1544                 list_move_tail(&bss->list, &local->sta_bss_list);
1545                 spin_unlock_bh(&local->sta_bss_lock);
1546 #endif
1547         }
1548
1549         if (bss->probe_resp && beacon) {
1550                 /* Do not allow beacon to override data from Probe Response. */
1551                 ieee80211_rx_bss_put(dev, bss);
1552                 return;
1553         }
1554
1555         /* save the ERP value so that it is available at association time */
1556         if (elems.erp_info && elems.erp_info_len >= 1) {
1557                 bss->erp_value = elems.erp_info[0];
1558                 bss->has_erp_value = 1;
1559         }
1560
1561         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
1562         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
1563
1564         bss->supp_rates_len = 0;
1565         if (elems.supp_rates) {
1566                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1567                 if (clen > elems.supp_rates_len)
1568                         clen = elems.supp_rates_len;
1569                 memcpy(&bss->supp_rates[bss->supp_rates_len], elems.supp_rates,
1570                        clen);
1571                 bss->supp_rates_len += clen;
1572         }
1573         if (elems.ext_supp_rates) {
1574                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
1575                 if (clen > elems.ext_supp_rates_len)
1576                         clen = elems.ext_supp_rates_len;
1577                 memcpy(&bss->supp_rates[bss->supp_rates_len],
1578                        elems.ext_supp_rates, clen);
1579                 bss->supp_rates_len += clen;
1580         }
1581
1582         if (elems.wpa &&
1583             (!bss->wpa_ie || bss->wpa_ie_len != elems.wpa_len ||
1584              memcmp(bss->wpa_ie, elems.wpa, elems.wpa_len))) {
1585                 kfree(bss->wpa_ie);
1586                 bss->wpa_ie = kmalloc(elems.wpa_len + 2, GFP_ATOMIC);
1587                 if (bss->wpa_ie) {
1588                         memcpy(bss->wpa_ie, elems.wpa - 2, elems.wpa_len + 2);
1589                         bss->wpa_ie_len = elems.wpa_len + 2;
1590                 } else
1591                         bss->wpa_ie_len = 0;
1592         } else if (!elems.wpa && bss->wpa_ie) {
1593                 kfree(bss->wpa_ie);
1594                 bss->wpa_ie = NULL;
1595                 bss->wpa_ie_len = 0;
1596         }
1597
1598         if (elems.rsn &&
1599             (!bss->rsn_ie || bss->rsn_ie_len != elems.rsn_len ||
1600              memcmp(bss->rsn_ie, elems.rsn, elems.rsn_len))) {
1601                 kfree(bss->rsn_ie);
1602                 bss->rsn_ie = kmalloc(elems.rsn_len + 2, GFP_ATOMIC);
1603                 if (bss->rsn_ie) {
1604                         memcpy(bss->rsn_ie, elems.rsn - 2, elems.rsn_len + 2);
1605                         bss->rsn_ie_len = elems.rsn_len + 2;
1606                 } else
1607                         bss->rsn_ie_len = 0;
1608         } else if (!elems.rsn && bss->rsn_ie) {
1609                 kfree(bss->rsn_ie);
1610                 bss->rsn_ie = NULL;
1611                 bss->rsn_ie_len = 0;
1612         }
1613
1614         if (elems.wmm_param &&
1615             (!bss->wmm_ie || bss->wmm_ie_len != elems.wmm_param_len ||
1616              memcmp(bss->wmm_ie, elems.wmm_param, elems.wmm_param_len))) {
1617                 kfree(bss->wmm_ie);
1618                 bss->wmm_ie = kmalloc(elems.wmm_param_len + 2, GFP_ATOMIC);
1619                 if (bss->wmm_ie) {
1620                         memcpy(bss->wmm_ie, elems.wmm_param - 2,
1621                                elems.wmm_param_len + 2);
1622                         bss->wmm_ie_len = elems.wmm_param_len + 2;
1623                 } else
1624                         bss->wmm_ie_len = 0;
1625         } else if (!elems.wmm_param && bss->wmm_ie) {
1626                 kfree(bss->wmm_ie);
1627                 bss->wmm_ie = NULL;
1628                 bss->wmm_ie_len = 0;
1629         }
1630
1631
1632         bss->hw_mode = rx_status->phymode;
1633         bss->freq = rx_status->freq;
1634         if (channel != rx_status->channel &&
1635             (bss->hw_mode == MODE_IEEE80211G ||
1636              bss->hw_mode == MODE_IEEE80211B) &&
1637             channel >= 1 && channel <= 14) {
1638                 static const int freq_list[] = {
1639                         2412, 2417, 2422, 2427, 2432, 2437, 2442,
1640                         2447, 2452, 2457, 2462, 2467, 2472, 2484
1641                 };
1642                 /* IEEE 802.11g/b mode can receive packets from neighboring
1643                  * channels, so map the channel into frequency. */
1644                 bss->freq = freq_list[channel - 1];
1645         }
1646         bss->timestamp = timestamp;
1647         bss->last_update = jiffies;
1648         bss->rssi = rx_status->ssi;
1649         bss->signal = rx_status->signal;
1650         bss->noise = rx_status->noise;
1651         if (!beacon)
1652                 bss->probe_resp++;
1653         ieee80211_rx_bss_put(dev, bss);
1654 }
1655
1656
1657 static void ieee80211_rx_mgmt_probe_resp(struct net_device *dev,
1658                                          struct ieee80211_mgmt *mgmt,
1659                                          size_t len,
1660                                          struct ieee80211_rx_status *rx_status)
1661 {
1662         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 0);
1663 }
1664
1665
1666 static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
1667                                      struct ieee80211_mgmt *mgmt,
1668                                      size_t len,
1669                                      struct ieee80211_rx_status *rx_status)
1670 {
1671         struct ieee80211_sub_if_data *sdata;
1672         struct ieee80211_if_sta *ifsta;
1673         size_t baselen;
1674         struct ieee802_11_elems elems;
1675
1676         ieee80211_rx_bss_info(dev, mgmt, len, rx_status, 1);
1677
1678         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1679         if (sdata->type != IEEE80211_IF_TYPE_STA)
1680                 return;
1681         ifsta = &sdata->u.sta;
1682
1683         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) ||
1684             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1685                 return;
1686
1687         /* Process beacon from the current BSS */
1688         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1689         if (baselen > len)
1690                 return;
1691
1692         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1693
1694         if (elems.erp_info && elems.erp_info_len >= 1)
1695                 ieee80211_handle_erp_ie(dev, elems.erp_info[0]);
1696
1697         if (elems.wmm_param && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
1698                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,
1699                                          elems.wmm_param_len);
1700         }
1701 }
1702
1703
1704 static void ieee80211_rx_mgmt_probe_req(struct net_device *dev,
1705                                         struct ieee80211_if_sta *ifsta,
1706                                         struct ieee80211_mgmt *mgmt,
1707                                         size_t len,
1708                                         struct ieee80211_rx_status *rx_status)
1709 {
1710         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1711         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1712         int tx_last_beacon;
1713         struct sk_buff *skb;
1714         struct ieee80211_mgmt *resp;
1715         u8 *pos, *end;
1716         DECLARE_MAC_BUF(mac);
1717 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1718         DECLARE_MAC_BUF(mac2);
1719         DECLARE_MAC_BUF(mac3);
1720 #endif
1721
1722         if (sdata->type != IEEE80211_IF_TYPE_IBSS ||
1723             ifsta->state != IEEE80211_IBSS_JOINED ||
1724             len < 24 + 2 || !ifsta->probe_resp)
1725                 return;
1726
1727         if (local->ops->tx_last_beacon)
1728                 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local));
1729         else
1730                 tx_last_beacon = 1;
1731
1732 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1733         printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID="
1734                "%s (tx_last_beacon=%d)\n",
1735                dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da),
1736                print_mac(mac3, mgmt->bssid), tx_last_beacon);
1737 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1738
1739         if (!tx_last_beacon)
1740                 return;
1741
1742         if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 &&
1743             memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
1744                 return;
1745
1746         end = ((u8 *) mgmt) + len;
1747         pos = mgmt->u.probe_req.variable;
1748         if (pos[0] != WLAN_EID_SSID ||
1749             pos + 2 + pos[1] > end) {
1750                 if (net_ratelimit()) {
1751                         printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq "
1752                                "from %s\n",
1753                                dev->name, print_mac(mac, mgmt->sa));
1754                 }
1755                 return;
1756         }
1757         if (pos[1] != 0 &&
1758             (pos[1] != ifsta->ssid_len ||
1759              memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) {
1760                 /* Ignore ProbeReq for foreign SSID */
1761                 return;
1762         }
1763
1764         /* Reply with ProbeResp */
1765         skb = skb_copy(ifsta->probe_resp, GFP_KERNEL);
1766         if (!skb)
1767                 return;
1768
1769         resp = (struct ieee80211_mgmt *) skb->data;
1770         memcpy(resp->da, mgmt->sa, ETH_ALEN);
1771 #ifdef CONFIG_MAC80211_IBSS_DEBUG
1772         printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n",
1773                dev->name, print_mac(mac, resp->da));
1774 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
1775         ieee80211_sta_tx(dev, skb, 0);
1776 }
1777
1778
1779 void ieee80211_sta_rx_mgmt(struct net_device *dev, struct sk_buff *skb,
1780                            struct ieee80211_rx_status *rx_status)
1781 {
1782         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1783         struct ieee80211_sub_if_data *sdata;
1784         struct ieee80211_if_sta *ifsta;
1785         struct ieee80211_mgmt *mgmt;
1786         u16 fc;
1787
1788         if (skb->len < 24)
1789                 goto fail;
1790
1791         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1792         ifsta = &sdata->u.sta;
1793
1794         mgmt = (struct ieee80211_mgmt *) skb->data;
1795         fc = le16_to_cpu(mgmt->frame_control);
1796
1797         switch (fc & IEEE80211_FCTL_STYPE) {
1798         case IEEE80211_STYPE_PROBE_REQ:
1799         case IEEE80211_STYPE_PROBE_RESP:
1800         case IEEE80211_STYPE_BEACON:
1801                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1802         case IEEE80211_STYPE_AUTH:
1803         case IEEE80211_STYPE_ASSOC_RESP:
1804         case IEEE80211_STYPE_REASSOC_RESP:
1805         case IEEE80211_STYPE_DEAUTH:
1806         case IEEE80211_STYPE_DISASSOC:
1807                 skb_queue_tail(&ifsta->skb_queue, skb);
1808                 queue_work(local->hw.workqueue, &ifsta->work);
1809                 return;
1810         default:
1811                 printk(KERN_DEBUG "%s: received unknown management frame - "
1812                        "stype=%d\n", dev->name,
1813                        (fc & IEEE80211_FCTL_STYPE) >> 4);
1814                 break;
1815         }
1816
1817  fail:
1818         kfree_skb(skb);
1819 }
1820
1821
1822 static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
1823                                          struct sk_buff *skb)
1824 {
1825         struct ieee80211_rx_status *rx_status;
1826         struct ieee80211_sub_if_data *sdata;
1827         struct ieee80211_if_sta *ifsta;
1828         struct ieee80211_mgmt *mgmt;
1829         u16 fc;
1830
1831         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1832         ifsta = &sdata->u.sta;
1833
1834         rx_status = (struct ieee80211_rx_status *) skb->cb;
1835         mgmt = (struct ieee80211_mgmt *) skb->data;
1836         fc = le16_to_cpu(mgmt->frame_control);
1837
1838         switch (fc & IEEE80211_FCTL_STYPE) {
1839         case IEEE80211_STYPE_PROBE_REQ:
1840                 ieee80211_rx_mgmt_probe_req(dev, ifsta, mgmt, skb->len,
1841                                             rx_status);
1842                 break;
1843         case IEEE80211_STYPE_PROBE_RESP:
1844                 ieee80211_rx_mgmt_probe_resp(dev, mgmt, skb->len, rx_status);
1845                 break;
1846         case IEEE80211_STYPE_BEACON:
1847                 ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len, rx_status);
1848                 break;
1849         case IEEE80211_STYPE_AUTH:
1850                 ieee80211_rx_mgmt_auth(dev, ifsta, mgmt, skb->len);
1851                 break;
1852         case IEEE80211_STYPE_ASSOC_RESP:
1853                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 0);
1854                 break;
1855         case IEEE80211_STYPE_REASSOC_RESP:
1856                 ieee80211_rx_mgmt_assoc_resp(dev, ifsta, mgmt, skb->len, 1);
1857                 break;
1858         case IEEE80211_STYPE_DEAUTH:
1859                 ieee80211_rx_mgmt_deauth(dev, ifsta, mgmt, skb->len);
1860                 break;
1861         case IEEE80211_STYPE_DISASSOC:
1862                 ieee80211_rx_mgmt_disassoc(dev, ifsta, mgmt, skb->len);
1863                 break;
1864         }
1865
1866         kfree_skb(skb);
1867 }
1868
1869
1870 void ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
1871                            struct ieee80211_rx_status *rx_status)
1872 {
1873         struct ieee80211_mgmt *mgmt;
1874         u16 fc;
1875
1876         if (skb->len < 24) {
1877                 dev_kfree_skb(skb);
1878                 return;
1879         }
1880
1881         mgmt = (struct ieee80211_mgmt *) skb->data;
1882         fc = le16_to_cpu(mgmt->frame_control);
1883
1884         if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
1885                 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
1886                         ieee80211_rx_mgmt_probe_resp(dev, mgmt,
1887                                                      skb->len, rx_status);
1888                 } else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
1889                         ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
1890                                                  rx_status);
1891                 }
1892         }
1893
1894         dev_kfree_skb(skb);
1895 }
1896
1897
1898 static int ieee80211_sta_active_ibss(struct net_device *dev)
1899 {
1900         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1901         int active = 0;
1902         struct sta_info *sta;
1903
1904         read_lock_bh(&local->sta_lock);
1905         list_for_each_entry(sta, &local->sta_list, list) {
1906                 if (sta->dev == dev &&
1907                     time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
1908                                jiffies)) {
1909                         active++;
1910                         break;
1911                 }
1912         }
1913         read_unlock_bh(&local->sta_lock);
1914
1915         return active;
1916 }
1917
1918
1919 static void ieee80211_sta_expire(struct net_device *dev)
1920 {
1921         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1922         struct sta_info *sta, *tmp;
1923         LIST_HEAD(tmp_list);
1924         DECLARE_MAC_BUF(mac);
1925
1926         write_lock_bh(&local->sta_lock);
1927         list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
1928                 if (time_after(jiffies, sta->last_rx +
1929                                IEEE80211_IBSS_INACTIVITY_LIMIT)) {
1930                         printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
1931                                dev->name, print_mac(mac, sta->addr));
1932                         __sta_info_get(sta);
1933                         sta_info_remove(sta);
1934                         list_add(&sta->list, &tmp_list);
1935                 }
1936         write_unlock_bh(&local->sta_lock);
1937
1938         list_for_each_entry_safe(sta, tmp, &tmp_list, list) {
1939                 sta_info_free(sta);
1940                 sta_info_put(sta);
1941         }
1942 }
1943
1944
1945 static void ieee80211_sta_merge_ibss(struct net_device *dev,
1946                                      struct ieee80211_if_sta *ifsta)
1947 {
1948         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
1949
1950         ieee80211_sta_expire(dev);
1951         if (ieee80211_sta_active_ibss(dev))
1952                 return;
1953
1954         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
1955                "IBSS networks with same SSID (merge)\n", dev->name);
1956         ieee80211_sta_req_scan(dev, ifsta->ssid, ifsta->ssid_len);
1957 }
1958
1959
1960 void ieee80211_sta_timer(unsigned long data)
1961 {
1962         struct ieee80211_sub_if_data *sdata =
1963                 (struct ieee80211_sub_if_data *) data;
1964         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1965         struct ieee80211_local *local = wdev_priv(&sdata->wdev);
1966
1967         set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
1968         queue_work(local->hw.workqueue, &ifsta->work);
1969 }
1970
1971
1972 void ieee80211_sta_work(struct work_struct *work)
1973 {
1974         struct ieee80211_sub_if_data *sdata =
1975                 container_of(work, struct ieee80211_sub_if_data, u.sta.work);
1976         struct net_device *dev = sdata->dev;
1977         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1978         struct ieee80211_if_sta *ifsta;
1979         struct sk_buff *skb;
1980
1981         if (!netif_running(dev))
1982                 return;
1983
1984         if (local->sta_scanning)
1985                 return;
1986
1987         if (sdata->type != IEEE80211_IF_TYPE_STA &&
1988             sdata->type != IEEE80211_IF_TYPE_IBSS) {
1989                 printk(KERN_DEBUG "%s: ieee80211_sta_work: non-STA interface "
1990                        "(type=%d)\n", dev->name, sdata->type);
1991                 return;
1992         }
1993         ifsta = &sdata->u.sta;
1994
1995         while ((skb = skb_dequeue(&ifsta->skb_queue)))
1996                 ieee80211_sta_rx_queued_mgmt(dev, skb);
1997
1998         if (ifsta->state != IEEE80211_AUTHENTICATE &&
1999             ifsta->state != IEEE80211_ASSOCIATE &&
2000             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
2001                 ieee80211_sta_start_scan(dev, NULL, 0);
2002                 return;
2003         }
2004
2005         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) {
2006                 if (ieee80211_sta_config_auth(dev, ifsta))
2007                         return;
2008                 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request);
2009         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request))
2010                 return;
2011
2012         switch (ifsta->state) {
2013         case IEEE80211_DISABLED:
2014                 break;
2015         case IEEE80211_AUTHENTICATE:
2016                 ieee80211_authenticate(dev, ifsta);
2017                 break;
2018         case IEEE80211_ASSOCIATE:
2019                 ieee80211_associate(dev, ifsta);
2020                 break;
2021         case IEEE80211_ASSOCIATED:
2022                 ieee80211_associated(dev, ifsta);
2023                 break;
2024         case IEEE80211_IBSS_SEARCH:
2025                 ieee80211_sta_find_ibss(dev, ifsta);
2026                 break;
2027         case IEEE80211_IBSS_JOINED:
2028                 ieee80211_sta_merge_ibss(dev, ifsta);
2029                 break;
2030         default:
2031                 printk(KERN_DEBUG "ieee80211_sta_work: Unknown state %d\n",
2032                        ifsta->state);
2033                 break;
2034         }
2035
2036         if (ieee80211_privacy_mismatch(dev, ifsta)) {
2037                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
2038                        "mixed-cell disabled - disassociate\n", dev->name);
2039
2040                 ieee80211_send_disassoc(dev, ifsta, WLAN_REASON_UNSPECIFIED);
2041                 ieee80211_set_disassoc(dev, ifsta, 0);
2042         }
2043 }
2044
2045
2046 static void ieee80211_sta_reset_auth(struct net_device *dev,
2047                                      struct ieee80211_if_sta *ifsta)
2048 {
2049         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2050
2051         if (local->ops->reset_tsf) {
2052                 /* Reset own TSF to allow time synchronization work. */
2053                 local->ops->reset_tsf(local_to_hw(local));
2054         }
2055
2056         ifsta->wmm_last_param_set = -1; /* allow any WMM update */
2057
2058
2059         if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
2060                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2061         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
2062                 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY;
2063         else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
2064                 ifsta->auth_alg = WLAN_AUTH_LEAP;
2065         else
2066                 ifsta->auth_alg = WLAN_AUTH_OPEN;
2067         printk(KERN_DEBUG "%s: Initial auth_alg=%d\n", dev->name,
2068                ifsta->auth_alg);
2069         ifsta->auth_transaction = -1;
2070         ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
2071         ifsta->auth_tries = ifsta->assoc_tries = 0;
2072         netif_carrier_off(dev);
2073 }
2074
2075
2076 void ieee80211_sta_req_auth(struct net_device *dev,
2077                             struct ieee80211_if_sta *ifsta)
2078 {
2079         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2080         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2081
2082         if (sdata->type != IEEE80211_IF_TYPE_STA)
2083                 return;
2084
2085         if ((ifsta->flags & (IEEE80211_STA_BSSID_SET |
2086                                 IEEE80211_STA_AUTO_BSSID_SEL)) &&
2087             (ifsta->flags & (IEEE80211_STA_SSID_SET |
2088                                 IEEE80211_STA_AUTO_SSID_SEL))) {
2089                 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
2090                 queue_work(local->hw.workqueue, &ifsta->work);
2091         }
2092 }
2093
2094 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
2095                                     const char *ssid, int ssid_len)
2096 {
2097         int tmp, hidden_ssid;
2098
2099         if (!memcmp(ifsta->ssid, ssid, ssid_len))
2100                 return 1;
2101
2102         if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
2103                 return 0;
2104
2105         hidden_ssid = 1;
2106         tmp = ssid_len;
2107         while (tmp--) {
2108                 if (ssid[tmp] != '\0') {
2109                         hidden_ssid = 0;
2110                         break;
2111                 }
2112         }
2113
2114         if (hidden_ssid && ifsta->ssid_len == ssid_len)
2115                 return 1;
2116
2117         if (ssid_len == 1 && ssid[0] == ' ')
2118                 return 1;
2119
2120         return 0;
2121 }
2122
2123 static int ieee80211_sta_config_auth(struct net_device *dev,
2124                                      struct ieee80211_if_sta *ifsta)
2125 {
2126         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2127         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2128         struct ieee80211_sta_bss *bss, *selected = NULL;
2129         int top_rssi = 0, freq;
2130
2131         if (!(ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
2132             IEEE80211_STA_AUTO_BSSID_SEL | IEEE80211_STA_AUTO_CHANNEL_SEL))) {
2133                 ifsta->state = IEEE80211_AUTHENTICATE;
2134                 ieee80211_sta_reset_auth(dev, ifsta);
2135                 return 0;
2136         }
2137
2138         spin_lock_bh(&local->sta_bss_lock);
2139         freq = local->oper_channel->freq;
2140         list_for_each_entry(bss, &local->sta_bss_list, list) {
2141                 if (!(bss->capability & WLAN_CAPABILITY_ESS))
2142                         continue;
2143
2144                 if (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
2145                     !!sdata->default_key)
2146                         continue;
2147
2148                 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
2149                     bss->freq != freq)
2150                         continue;
2151
2152                 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
2153                     memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
2154                         continue;
2155
2156                 if (!(ifsta->flags & IEEE80211_STA_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->flags & IEEE80211_STA_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->flags & IEEE80211_STA_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 =
2299                         ((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
2300                         (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
2301                         rate->val2 : rate->val;
2302                 control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2303                 control.power_level = local->hw.conf.power_level;
2304                 control.flags |= IEEE80211_TXCTL_NO_ACK;
2305                 control.retry_limit = 1;
2306
2307                 ifsta->probe_resp = skb_copy(skb, GFP_ATOMIC);
2308                 if (ifsta->probe_resp) {
2309                         mgmt = (struct ieee80211_mgmt *)
2310                                 ifsta->probe_resp->data;
2311                         mgmt->frame_control =
2312                                 IEEE80211_FC(IEEE80211_FTYPE_MGMT,
2313                                              IEEE80211_STYPE_PROBE_RESP);
2314                 } else {
2315                         printk(KERN_DEBUG "%s: Could not allocate ProbeResp "
2316                                "template for IBSS\n", dev->name);
2317                 }
2318
2319                 if (local->ops->beacon_update &&
2320                     local->ops->beacon_update(local_to_hw(local),
2321                                              skb, &control) == 0) {
2322                         printk(KERN_DEBUG "%s: Configured IBSS beacon "
2323                                "template based on scan results\n", dev->name);
2324                         skb = NULL;
2325                 }
2326
2327                 rates = 0;
2328                 mode = local->oper_hw_mode;
2329                 for (i = 0; i < bss->supp_rates_len; i++) {
2330                         int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
2331                         for (j = 0; j < mode->num_rates; j++)
2332                                 if (mode->rates[j].rate == bitrate)
2333                                         rates |= BIT(j);
2334                 }
2335                 ifsta->supp_rates_bits = rates;
2336         } while (0);
2337
2338         if (skb) {
2339                 printk(KERN_DEBUG "%s: Failed to configure IBSS beacon "
2340                        "template\n", dev->name);
2341                 dev_kfree_skb(skb);
2342         }
2343
2344         ifsta->state = IEEE80211_IBSS_JOINED;
2345         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
2346
2347         ieee80211_rx_bss_put(dev, bss);
2348
2349         return res;
2350 }
2351
2352
2353 static int ieee80211_sta_create_ibss(struct net_device *dev,
2354                                      struct ieee80211_if_sta *ifsta)
2355 {
2356         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2357         struct ieee80211_sta_bss *bss;
2358         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2359         struct ieee80211_hw_mode *mode;
2360         u8 bssid[ETH_ALEN], *pos;
2361         int i;
2362         DECLARE_MAC_BUF(mac);
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 %s\n",
2379                dev->name, print_mac(mac, bssid));
2380
2381         bss = ieee80211_rx_bss_add(dev, bssid, local->hw.conf.channel,
2382                                    sdata->u.sta.ssid, sdata->u.sta.ssid_len);
2383         if (!bss)
2384                 return -ENOMEM;
2385
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->freq = local->hw.conf.freq;
2393         bss->last_update = jiffies;
2394         bss->capability = WLAN_CAPABILITY_IBSS;
2395         if (sdata->default_key) {
2396                 bss->capability |= WLAN_CAPABILITY_PRIVACY;
2397         } else
2398                 sdata->drop_unencrypted = 0;
2399         bss->supp_rates_len = mode->num_rates;
2400         pos = bss->supp_rates;
2401         for (i = 0; i < mode->num_rates; i++) {
2402                 int rate = mode->rates[i].rate;
2403                 *pos++ = (u8) (rate / 5);
2404         }
2405
2406         return ieee80211_sta_join_ibss(dev, ifsta, bss);
2407 }
2408
2409
2410 static int ieee80211_sta_find_ibss(struct net_device *dev,
2411                                    struct ieee80211_if_sta *ifsta)
2412 {
2413         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2414         struct ieee80211_sta_bss *bss;
2415         int found = 0;
2416         u8 bssid[ETH_ALEN];
2417         int active_ibss;
2418         DECLARE_MAC_BUF(mac);
2419         DECLARE_MAC_BUF(mac2);
2420
2421         if (ifsta->ssid_len == 0)
2422                 return -EINVAL;
2423
2424         active_ibss = ieee80211_sta_active_ibss(dev);
2425 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2426         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
2427                dev->name, active_ibss);
2428 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2429         spin_lock_bh(&local->sta_bss_lock);
2430         list_for_each_entry(bss, &local->sta_bss_list, list) {
2431                 if (ifsta->ssid_len != bss->ssid_len ||
2432                     memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
2433                     || !(bss->capability & WLAN_CAPABILITY_IBSS))
2434                         continue;
2435 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2436                 printk(KERN_DEBUG "   bssid=%s found\n",
2437                        print_mac(mac, bss->bssid));
2438 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2439                 memcpy(bssid, bss->bssid, ETH_ALEN);
2440                 found = 1;
2441                 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
2442                         break;
2443         }
2444         spin_unlock_bh(&local->sta_bss_lock);
2445
2446 #ifdef CONFIG_MAC80211_IBSS_DEBUG
2447         printk(KERN_DEBUG "   sta_find_ibss: selected %s current "
2448                "%s\n", print_mac(mac, bssid), print_mac(mac2, ifsta->bssid));
2449 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
2450         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
2451             (bss = ieee80211_rx_bss_get(dev, bssid, local->hw.conf.channel,
2452                                         ifsta->ssid, ifsta->ssid_len))) {
2453                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
2454                        " based on configured SSID\n",
2455                        dev->name, print_mac(mac, 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->flags & IEEE80211_STA_CREATE_IBSS) &&
2479                             local->oper_channel->flag & IEEE80211_CHAN_W_IBSS)
2480                                 return ieee80211_sta_create_ibss(dev, ifsta);
2481                         if (ifsta->flags & IEEE80211_STA_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->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
2543         memcpy(ifsta->ssid, ssid, len);
2544         memset(ifsta->ssid + len, 0, IEEE80211_MAX_SSID_LEN - len);
2545         ifsta->ssid_len = len;
2546
2547         if (len)
2548                 ifsta->flags |= IEEE80211_STA_SSID_SET;
2549         else
2550                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
2551         if (sdata->type == IEEE80211_IF_TYPE_IBSS &&
2552             !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
2553                 ifsta->ibss_join_req = jiffies;
2554                 ifsta->state = IEEE80211_IBSS_SEARCH;
2555                 return ieee80211_sta_find_ibss(dev, ifsta);
2556         }
2557         return 0;
2558 }
2559
2560
2561 int ieee80211_sta_get_ssid(struct net_device *dev, char *ssid, size_t *len)
2562 {
2563         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2564         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2565         memcpy(ssid, ifsta->ssid, ifsta->ssid_len);
2566         *len = ifsta->ssid_len;
2567         return 0;
2568 }
2569
2570
2571 int ieee80211_sta_set_bssid(struct net_device *dev, u8 *bssid)
2572 {
2573         struct ieee80211_sub_if_data *sdata;
2574         struct ieee80211_if_sta *ifsta;
2575         int res;
2576
2577         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2578         ifsta = &sdata->u.sta;
2579
2580         if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
2581                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
2582                 res = ieee80211_if_config(dev);
2583                 if (res) {
2584                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2585                                "the low-level driver\n", dev->name);
2586                         return res;
2587                 }
2588         }
2589
2590         if (is_valid_ether_addr(bssid))
2591                 ifsta->flags |= IEEE80211_STA_BSSID_SET;
2592         else
2593                 ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
2594
2595         return 0;
2596 }
2597
2598
2599 static void ieee80211_send_nullfunc(struct ieee80211_local *local,
2600                                     struct ieee80211_sub_if_data *sdata,
2601                                     int powersave)
2602 {
2603         struct sk_buff *skb;
2604         struct ieee80211_hdr *nullfunc;
2605         u16 fc;
2606
2607         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2608         if (!skb) {
2609                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2610                        "frame\n", sdata->dev->name);
2611                 return;
2612         }
2613         skb_reserve(skb, local->hw.extra_tx_headroom);
2614
2615         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2616         memset(nullfunc, 0, 24);
2617         fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2618              IEEE80211_FCTL_TODS;
2619         if (powersave)
2620                 fc |= IEEE80211_FCTL_PM;
2621         nullfunc->frame_control = cpu_to_le16(fc);
2622         memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
2623         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2624         memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
2625
2626         ieee80211_sta_tx(sdata->dev, skb, 0);
2627 }
2628
2629
2630 void ieee80211_scan_completed(struct ieee80211_hw *hw)
2631 {
2632         struct ieee80211_local *local = hw_to_local(hw);
2633         struct net_device *dev = local->scan_dev;
2634         struct ieee80211_sub_if_data *sdata;
2635         union iwreq_data wrqu;
2636
2637         local->last_scan_completed = jiffies;
2638         wmb();
2639         local->sta_scanning = 0;
2640
2641         if (ieee80211_hw_config(local))
2642                 printk(KERN_DEBUG "%s: failed to restore operational"
2643                        "channel after scan\n", dev->name);
2644
2645
2646         netif_tx_lock_bh(local->mdev);
2647         local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
2648         local->ops->configure_filter(local_to_hw(local),
2649                                      FIF_BCN_PRBRESP_PROMISC,
2650                                      &local->filter_flags,
2651                                      local->mdev->mc_count,
2652                                      local->mdev->mc_list);
2653
2654         netif_tx_unlock_bh(local->mdev);
2655
2656         memset(&wrqu, 0, sizeof(wrqu));
2657         wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
2658
2659         rcu_read_lock();
2660         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2661
2662                 /* No need to wake the master device. */
2663                 if (sdata->dev == local->mdev)
2664                         continue;
2665
2666                 if (sdata->type == IEEE80211_IF_TYPE_STA) {
2667                         if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED)
2668                                 ieee80211_send_nullfunc(local, sdata, 0);
2669                         ieee80211_sta_timer((unsigned long)sdata);
2670                 }
2671
2672                 netif_wake_queue(sdata->dev);
2673         }
2674         rcu_read_unlock();
2675
2676         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2677         if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
2678                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2679                 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
2680                     (!ifsta->state == IEEE80211_IBSS_JOINED &&
2681                     !ieee80211_sta_active_ibss(dev)))
2682                         ieee80211_sta_find_ibss(dev, ifsta);
2683         }
2684 }
2685 EXPORT_SYMBOL(ieee80211_scan_completed);
2686
2687 void ieee80211_sta_scan_work(struct work_struct *work)
2688 {
2689         struct ieee80211_local *local =
2690                 container_of(work, struct ieee80211_local, scan_work.work);
2691         struct net_device *dev = local->scan_dev;
2692         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2693         struct ieee80211_hw_mode *mode;
2694         struct ieee80211_channel *chan;
2695         int skip;
2696         unsigned long next_delay = 0;
2697
2698         if (!local->sta_scanning)
2699                 return;
2700
2701         switch (local->scan_state) {
2702         case SCAN_SET_CHANNEL:
2703                 mode = local->scan_hw_mode;
2704                 if (local->scan_hw_mode->list.next == &local->modes_list &&
2705                     local->scan_channel_idx >= mode->num_channels) {
2706                         ieee80211_scan_completed(local_to_hw(local));
2707                         return;
2708                 }
2709                 skip = !(local->enabled_modes & (1 << mode->mode));
2710                 chan = &mode->channels[local->scan_channel_idx];
2711                 if (!(chan->flag & IEEE80211_CHAN_W_SCAN) ||
2712                     (sdata->type == IEEE80211_IF_TYPE_IBSS &&
2713                      !(chan->flag & IEEE80211_CHAN_W_IBSS)) ||
2714                     (local->hw_modes & local->enabled_modes &
2715                      (1 << MODE_IEEE80211G) && mode->mode == MODE_IEEE80211B))
2716                         skip = 1;
2717
2718                 if (!skip) {
2719 #if 0
2720                         printk(KERN_DEBUG "%s: scan channel %d (%d MHz)\n",
2721                                dev->name, chan->chan, chan->freq);
2722 #endif
2723
2724                         local->scan_channel = chan;
2725                         if (ieee80211_hw_config(local)) {
2726                                 printk(KERN_DEBUG "%s: failed to set channel "
2727                                        "%d (%d MHz) for scan\n", dev->name,
2728                                        chan->chan, chan->freq);
2729                                 skip = 1;
2730                         }
2731                 }
2732
2733                 local->scan_channel_idx++;
2734                 if (local->scan_channel_idx >= local->scan_hw_mode->num_channels) {
2735                         if (local->scan_hw_mode->list.next != &local->modes_list) {
2736                                 local->scan_hw_mode = list_entry(local->scan_hw_mode->list.next,
2737                                                                  struct ieee80211_hw_mode,
2738                                                                  list);
2739                                 local->scan_channel_idx = 0;
2740                         }
2741                 }
2742
2743                 if (skip)
2744                         break;
2745
2746                 next_delay = IEEE80211_PROBE_DELAY +
2747                              usecs_to_jiffies(local->hw.channel_change_time);
2748                 local->scan_state = SCAN_SEND_PROBE;
2749                 break;
2750         case SCAN_SEND_PROBE:
2751                 if (local->scan_channel->flag & IEEE80211_CHAN_W_ACTIVE_SCAN) {
2752                         ieee80211_send_probe_req(dev, NULL, local->scan_ssid,
2753                                                  local->scan_ssid_len);
2754                         next_delay = IEEE80211_CHANNEL_TIME;
2755                 } else
2756                         next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
2757                 local->scan_state = SCAN_SET_CHANNEL;
2758                 break;
2759         }
2760
2761         if (local->sta_scanning)
2762                 queue_delayed_work(local->hw.workqueue, &local->scan_work,
2763                                    next_delay);
2764 }
2765
2766
2767 static int ieee80211_sta_start_scan(struct net_device *dev,
2768                                     u8 *ssid, size_t ssid_len)
2769 {
2770         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2771         struct ieee80211_sub_if_data *sdata;
2772
2773         if (ssid_len > IEEE80211_MAX_SSID_LEN)
2774                 return -EINVAL;
2775
2776         /* MLME-SCAN.request (page 118)  page 144 (11.1.3.1)
2777          * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
2778          * BSSID: MACAddress
2779          * SSID
2780          * ScanType: ACTIVE, PASSIVE
2781          * ProbeDelay: delay (in microseconds) to be used prior to transmitting
2782          *    a Probe frame during active scanning
2783          * ChannelList
2784          * MinChannelTime (>= ProbeDelay), in TU
2785          * MaxChannelTime: (>= MinChannelTime), in TU
2786          */
2787
2788          /* MLME-SCAN.confirm
2789           * BSSDescriptionSet
2790           * ResultCode: SUCCESS, INVALID_PARAMETERS
2791          */
2792
2793         if (local->sta_scanning) {
2794                 if (local->scan_dev == dev)
2795                         return 0;
2796                 return -EBUSY;
2797         }
2798
2799         if (local->ops->hw_scan) {
2800                 int rc = local->ops->hw_scan(local_to_hw(local),
2801                                             ssid, ssid_len);
2802                 if (!rc) {
2803                         local->sta_scanning = 1;
2804                         local->scan_dev = dev;
2805                 }
2806                 return rc;
2807         }
2808
2809         local->sta_scanning = 1;
2810
2811         rcu_read_lock();
2812         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
2813
2814                 /* Don't stop the master interface, otherwise we can't transmit
2815                  * probes! */
2816                 if (sdata->dev == local->mdev)
2817                         continue;
2818
2819                 netif_stop_queue(sdata->dev);
2820                 if (sdata->type == IEEE80211_IF_TYPE_STA &&
2821                     (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED))
2822                         ieee80211_send_nullfunc(local, sdata, 1);
2823         }
2824         rcu_read_unlock();
2825
2826         if (ssid) {
2827                 local->scan_ssid_len = ssid_len;
2828                 memcpy(local->scan_ssid, ssid, ssid_len);
2829         } else
2830                 local->scan_ssid_len = 0;
2831         local->scan_state = SCAN_SET_CHANNEL;
2832         local->scan_hw_mode = list_entry(local->modes_list.next,
2833                                          struct ieee80211_hw_mode,
2834                                          list);
2835         local->scan_channel_idx = 0;
2836         local->scan_dev = dev;
2837
2838         netif_tx_lock_bh(local->mdev);
2839         local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
2840         local->ops->configure_filter(local_to_hw(local),
2841                                      FIF_BCN_PRBRESP_PROMISC,
2842                                      &local->filter_flags,
2843                                      local->mdev->mc_count,
2844                                      local->mdev->mc_list);
2845         netif_tx_unlock_bh(local->mdev);
2846
2847         /* TODO: start scan as soon as all nullfunc frames are ACKed */
2848         queue_delayed_work(local->hw.workqueue, &local->scan_work,
2849                            IEEE80211_CHANNEL_TIME);
2850
2851         return 0;
2852 }
2853
2854
2855 int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
2856 {
2857         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2858         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
2859         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2860
2861         if (sdata->type != IEEE80211_IF_TYPE_STA)
2862                 return ieee80211_sta_start_scan(dev, ssid, ssid_len);
2863
2864         if (local->sta_scanning) {
2865                 if (local->scan_dev == dev)
2866                         return 0;
2867                 return -EBUSY;
2868         }
2869
2870         set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
2871         queue_work(local->hw.workqueue, &ifsta->work);
2872         return 0;
2873 }
2874
2875 static char *
2876 ieee80211_sta_scan_result(struct net_device *dev,
2877                           struct ieee80211_sta_bss *bss,
2878                           char *current_ev, char *end_buf)
2879 {
2880         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2881         struct iw_event iwe;
2882
2883         if (time_after(jiffies,
2884                        bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
2885                 return current_ev;
2886
2887         if (!(local->enabled_modes & (1 << bss->hw_mode)))
2888                 return current_ev;
2889
2890         if (local->scan_flags & IEEE80211_SCAN_WPA_ONLY &&
2891             !bss->wpa_ie && !bss->rsn_ie)
2892                 return current_ev;
2893
2894         if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID &&
2895             (local->scan_ssid_len != bss->ssid_len ||
2896              memcmp(local->scan_ssid, bss->ssid, bss->ssid_len) != 0))
2897                 return current_ev;
2898
2899         memset(&iwe, 0, sizeof(iwe));
2900         iwe.cmd = SIOCGIWAP;
2901         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2902         memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
2903         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2904                                           IW_EV_ADDR_LEN);
2905
2906         memset(&iwe, 0, sizeof(iwe));
2907         iwe.cmd = SIOCGIWESSID;
2908         iwe.u.data.length = bss->ssid_len;
2909         iwe.u.data.flags = 1;
2910         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2911                                           bss->ssid);
2912
2913         if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)) {
2914                 memset(&iwe, 0, sizeof(iwe));
2915                 iwe.cmd = SIOCGIWMODE;
2916                 if (bss->capability & WLAN_CAPABILITY_ESS)
2917                         iwe.u.mode = IW_MODE_MASTER;
2918                 else
2919                         iwe.u.mode = IW_MODE_ADHOC;
2920                 current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2921                                                   IW_EV_UINT_LEN);
2922         }
2923
2924         memset(&iwe, 0, sizeof(iwe));
2925         iwe.cmd = SIOCGIWFREQ;
2926         iwe.u.freq.m = bss->channel;
2927         iwe.u.freq.e = 0;
2928         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2929                                           IW_EV_FREQ_LEN);
2930         iwe.u.freq.m = bss->freq * 100000;
2931         iwe.u.freq.e = 1;
2932         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2933                                           IW_EV_FREQ_LEN);
2934
2935         memset(&iwe, 0, sizeof(iwe));
2936         iwe.cmd = IWEVQUAL;
2937         iwe.u.qual.qual = bss->signal;
2938         iwe.u.qual.level = bss->rssi;
2939         iwe.u.qual.noise = bss->noise;
2940         iwe.u.qual.updated = local->wstats_flags;
2941         current_ev = iwe_stream_add_event(current_ev, end_buf, &iwe,
2942                                           IW_EV_QUAL_LEN);
2943
2944         memset(&iwe, 0, sizeof(iwe));
2945         iwe.cmd = SIOCGIWENCODE;
2946         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
2947                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2948         else
2949                 iwe.u.data.flags = IW_ENCODE_DISABLED;
2950         iwe.u.data.length = 0;
2951         current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe, "");
2952
2953         if (bss && bss->wpa_ie) {
2954                 memset(&iwe, 0, sizeof(iwe));
2955                 iwe.cmd = IWEVGENIE;
2956                 iwe.u.data.length = bss->wpa_ie_len;
2957                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2958                                                   bss->wpa_ie);
2959         }
2960
2961         if (bss && bss->rsn_ie) {
2962                 memset(&iwe, 0, sizeof(iwe));
2963                 iwe.cmd = IWEVGENIE;
2964                 iwe.u.data.length = bss->rsn_ie_len;
2965                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
2966                                                   bss->rsn_ie);
2967         }
2968
2969         if (bss && bss->supp_rates_len > 0) {
2970                 /* display all supported rates in readable format */
2971                 char *p = current_ev + IW_EV_LCP_LEN;
2972                 int i;
2973
2974                 memset(&iwe, 0, sizeof(iwe));
2975                 iwe.cmd = SIOCGIWRATE;
2976                 /* Those two flags are ignored... */
2977                 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2978
2979                 for (i = 0; i < bss->supp_rates_len; i++) {
2980                         iwe.u.bitrate.value = ((bss->supp_rates[i] &
2981                                                         0x7f) * 500000);
2982                         p = iwe_stream_add_value(current_ev, p,
2983                                         end_buf, &iwe, IW_EV_PARAM_LEN);
2984                 }
2985                 current_ev = p;
2986         }
2987
2988         if (bss) {
2989                 char *buf;
2990                 buf = kmalloc(30, GFP_ATOMIC);
2991                 if (buf) {
2992                         memset(&iwe, 0, sizeof(iwe));
2993                         iwe.cmd = IWEVCUSTOM;
2994                         sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
2995                         iwe.u.data.length = strlen(buf);
2996                         current_ev = iwe_stream_add_point(current_ev, end_buf,
2997                                                           &iwe, buf);
2998                         kfree(buf);
2999                 }
3000         }
3001
3002         do {
3003                 char *buf;
3004
3005                 if (!(local->scan_flags & IEEE80211_SCAN_EXTRA_INFO))
3006                         break;
3007
3008                 buf = kmalloc(100, GFP_ATOMIC);
3009                 if (!buf)
3010                         break;
3011
3012                 memset(&iwe, 0, sizeof(iwe));
3013                 iwe.cmd = IWEVCUSTOM;
3014                 sprintf(buf, "bcn_int=%d", bss->beacon_int);
3015                 iwe.u.data.length = strlen(buf);
3016                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3017                                                   buf);
3018
3019                 memset(&iwe, 0, sizeof(iwe));
3020                 iwe.cmd = IWEVCUSTOM;
3021                 sprintf(buf, "capab=0x%04x", bss->capability);
3022                 iwe.u.data.length = strlen(buf);
3023                 current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
3024                                                   buf);
3025
3026                 kfree(buf);
3027                 break;
3028         } while (0);
3029
3030         return current_ev;
3031 }
3032
3033
3034 int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len)
3035 {
3036         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3037         char *current_ev = buf;
3038         char *end_buf = buf + len;
3039         struct ieee80211_sta_bss *bss;
3040
3041         spin_lock_bh(&local->sta_bss_lock);
3042         list_for_each_entry(bss, &local->sta_bss_list, list) {
3043                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3044                         spin_unlock_bh(&local->sta_bss_lock);
3045                         return -E2BIG;
3046                 }
3047                 current_ev = ieee80211_sta_scan_result(dev, bss, current_ev,
3048                                                        end_buf);
3049         }
3050         spin_unlock_bh(&local->sta_bss_lock);
3051         return current_ev - buf;
3052 }
3053
3054
3055 int ieee80211_sta_set_extra_ie(struct net_device *dev, char *ie, size_t len)
3056 {
3057         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3058         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3059         kfree(ifsta->extra_ie);
3060         if (len == 0) {
3061                 ifsta->extra_ie = NULL;
3062                 ifsta->extra_ie_len = 0;
3063                 return 0;
3064         }
3065         ifsta->extra_ie = kmalloc(len, GFP_KERNEL);
3066         if (!ifsta->extra_ie) {
3067                 ifsta->extra_ie_len = 0;
3068                 return -ENOMEM;
3069         }
3070         memcpy(ifsta->extra_ie, ie, len);
3071         ifsta->extra_ie_len = len;
3072         return 0;
3073 }
3074
3075
3076 struct sta_info * ieee80211_ibss_add_sta(struct net_device *dev,
3077                                          struct sk_buff *skb, u8 *bssid,
3078                                          u8 *addr)
3079 {
3080         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3081         struct sta_info *sta;
3082         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3083         DECLARE_MAC_BUF(mac);
3084
3085         /* TODO: Could consider removing the least recently used entry and
3086          * allow new one to be added. */
3087         if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
3088                 if (net_ratelimit()) {
3089                         printk(KERN_DEBUG "%s: No room for a new IBSS STA "
3090                                "entry %s\n", dev->name, print_mac(mac, addr));
3091                 }
3092                 return NULL;
3093         }
3094
3095         printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n",
3096                wiphy_name(local->hw.wiphy), print_mac(mac, addr), dev->name);
3097
3098         sta = sta_info_add(local, dev, addr, GFP_ATOMIC);
3099         if (!sta)
3100                 return NULL;
3101
3102         sta->supp_rates = sdata->u.sta.supp_rates_bits;
3103
3104         rate_control_rate_init(sta, local);
3105
3106         return sta; /* caller will call sta_info_put() */
3107 }
3108
3109
3110 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason)
3111 {
3112         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3113         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3114
3115         printk(KERN_DEBUG "%s: deauthenticate(reason=%d)\n",
3116                dev->name, reason);
3117
3118         if (sdata->type != IEEE80211_IF_TYPE_STA &&
3119             sdata->type != IEEE80211_IF_TYPE_IBSS)
3120                 return -EINVAL;
3121
3122         ieee80211_send_deauth(dev, ifsta, reason);
3123         ieee80211_set_disassoc(dev, ifsta, 1);
3124         return 0;
3125 }
3126
3127
3128 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason)
3129 {
3130         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3131         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
3132
3133         printk(KERN_DEBUG "%s: disassociate(reason=%d)\n",
3134                dev->name, reason);
3135
3136         if (sdata->type != IEEE80211_IF_TYPE_STA)
3137                 return -EINVAL;
3138
3139         if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED))
3140                 return -1;
3141
3142         ieee80211_send_disassoc(dev, ifsta, reason);
3143         ieee80211_set_disassoc(dev, ifsta, 0);
3144         return 0;
3145 }