net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.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 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <net/mac80211.h>
  21 #include <asm/unaligned.h>
  22
  23 #include "ieee80211_i.h"
  24 #include "rate.h"
  25 #include "led.h"
  26
  27 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
  28 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  29 #define IEEE80211_AUTH_MAX_TRIES 3
  30 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  31 #define IEEE80211_ASSOC_MAX_TRIES 3
  32 #define IEEE80211_MONITORING_INTERVAL (2 * HZ)
  33 #define IEEE80211_PROBE_INTERVAL (60 * HZ)
  34 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
  35
  36 /* utils */
  37 static int ecw2cw(int ecw)
  38 {
  39         return (1 << ecw) - 1;
  40 }
  41
  42 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
  43 {
  44         u8 *end, *pos;
  45
  46         pos = bss->cbss.information_elements;
  47         if (pos == NULL)
  48                 return NULL;
  49         end = pos + bss->cbss.len_information_elements;
  50
  51         while (pos + 1 < end) {
  52                 if (pos + 2 + pos[1] > end)
  53                         break;
  54                 if (pos[0] == ie)
  55                         return pos;
  56                 pos += 2 + pos[1];
  57         }
  58
  59         return NULL;
  60 }
  61
  62 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
  63                                       struct ieee80211_supported_band *sband,
  64                                       u32 *rates)
  65 {
  66         int i, j, count;
  67         *rates = 0;
  68         count = 0;
  69         for (i = 0; i < bss->supp_rates_len; i++) {
  70                 int rate = (bss->supp_rates[i] & 0x7F) * 5;
  71
  72                 for (j = 0; j < sband->n_bitrates; j++)
  73                         if (sband->bitrates[j].bitrate == rate) {
  74                                 *rates |= BIT(j);
  75                                 count++;
  76                                 break;
  77                         }
  78         }
  79
  80         return count;
  81 }
  82
  83 /* frame sending functions */
  84
  85 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
  86 {
  87         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  88         struct ieee80211_local *local = sdata->local;
  89         struct sk_buff *skb;
  90         struct ieee80211_mgmt *mgmt;
  91         u8 *pos, *ies, *ht_ie;
  92         int i, len, count, rates_len, supp_rates_len;
  93         u16 capab;
  94         struct ieee80211_bss *bss;
  95         int wmm = 0;
  96         struct ieee80211_supported_band *sband;
  97         u32 rates = 0;
  98
  99         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 100                             sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
 101                             ifmgd->ssid_len);
 102         if (!skb) {
 103                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
 104                        "frame\n", sdata->dev->name);
 105                 return;
 106         }
 107         skb_reserve(skb, local->hw.extra_tx_headroom);
 108
 109         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 110
 111         capab = ifmgd->capab;
 112
 113         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
 114                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 115                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 116                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 117                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 118         }
 119
 120         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 121                                    local->hw.conf.channel->center_freq,
 122                                    ifmgd->ssid, ifmgd->ssid_len);
 123         if (bss) {
 124                 if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
 125                         capab |= WLAN_CAPABILITY_PRIVACY;
 126                 if (bss->wmm_used)
 127                         wmm = 1;
 128
 129                 /* get all rates supported by the device and the AP as
 130                  * some APs don't like getting a superset of their rates
 131                  * in the association request (e.g. D-Link DAP 1353 in
 132                  * b-only mode) */
 133                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 134
 135                 if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 136                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 137                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 138
 139                 ieee80211_rx_bss_put(local, bss);
 140         } else {
 141                 rates = ~0;
 142                 rates_len = sband->n_bitrates;
 143         }
 144
 145         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 146         memset(mgmt, 0, 24);
 147         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 148         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 149         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 150
 151         if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
 152                 skb_put(skb, 10);
 153                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 154                                                   IEEE80211_STYPE_REASSOC_REQ);
 155                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 156                 mgmt->u.reassoc_req.listen_interval =
 157                                 cpu_to_le16(local->hw.conf.listen_interval);
 158                 memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
 159                        ETH_ALEN);
 160         } else {
 161                 skb_put(skb, 4);
 162                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 163                                                   IEEE80211_STYPE_ASSOC_REQ);
 164                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 165                 mgmt->u.assoc_req.listen_interval =
 166                                 cpu_to_le16(local->hw.conf.listen_interval);
 167         }
 168
 169         /* SSID */
 170         ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
 171         *pos++ = WLAN_EID_SSID;
 172         *pos++ = ifmgd->ssid_len;
 173         memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
 174
 175         /* add all rates which were marked to be used above */
 176         supp_rates_len = rates_len;
 177         if (supp_rates_len > 8)
 178                 supp_rates_len = 8;
 179
 180         len = sband->n_bitrates;
 181         pos = skb_put(skb, supp_rates_len + 2);
 182         *pos++ = WLAN_EID_SUPP_RATES;
 183         *pos++ = supp_rates_len;
 184
 185         count = 0;
 186         for (i = 0; i < sband->n_bitrates; i++) {
 187                 if (BIT(i) & rates) {
 188                         int rate = sband->bitrates[i].bitrate;
 189                         *pos++ = (u8) (rate / 5);
 190                         if (++count == 8)
 191                                 break;
 192                 }
 193         }
 194
 195         if (rates_len > count) {
 196                 pos = skb_put(skb, rates_len - count + 2);
 197                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 198                 *pos++ = rates_len - count;
 199
 200                 for (i++; i < sband->n_bitrates; i++) {
 201                         if (BIT(i) & rates) {
 202                                 int rate = sband->bitrates[i].bitrate;
 203                                 *pos++ = (u8) (rate / 5);
 204                         }
 205                 }
 206         }
 207
 208         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 209                 /* 1. power capabilities */
 210                 pos = skb_put(skb, 4);
 211                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 212                 *pos++ = 2;
 213                 *pos++ = 0; /* min tx power */
 214                 *pos++ = local->hw.conf.channel->max_power; /* max tx power */
 215
 216                 /* 2. supported channels */
 217                 /* TODO: get this in reg domain format */
 218                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 219                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 220                 *pos++ = 2 * sband->n_channels;
 221                 for (i = 0; i < sband->n_channels; i++) {
 222                         *pos++ = ieee80211_frequency_to_channel(
 223                                         sband->channels[i].center_freq);
 224                         *pos++ = 1; /* one channel in the subband*/
 225                 }
 226         }
 227
 228         if (ifmgd->extra_ie) {
 229                 pos = skb_put(skb, ifmgd->extra_ie_len);
 230                 memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
 231         }
 232
 233         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
 234                 pos = skb_put(skb, 9);
 235                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 236                 *pos++ = 7; /* len */
 237                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 238                 *pos++ = 0x50;
 239                 *pos++ = 0xf2;
 240                 *pos++ = 2; /* WME */
 241                 *pos++ = 0; /* WME info */
 242                 *pos++ = 1; /* WME ver */
 243                 *pos++ = 0;
 244         }
 245
 246         /* wmm support is a must to HT */
 247         /*
 248          * IEEE802.11n does not allow TKIP/WEP as pairwise
 249          * ciphers in HT mode. We still associate in non-ht
 250          * mode (11a/b/g) if any one of these ciphers is
 251          * configured as pairwise.
 252          */
 253         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
 254             sband->ht_cap.ht_supported &&
 255             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
 256             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
 257             (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
 258                 struct ieee80211_ht_info *ht_info =
 259                         (struct ieee80211_ht_info *)(ht_ie + 2);
 260                 u16 cap = sband->ht_cap.cap;
 261                 __le16 tmp;
 262                 u32 flags = local->hw.conf.channel->flags;
 263
 264                 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 265                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 266                         if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
 267                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 268                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 269                         }
 270                         break;
 271                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 272                         if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
 273                                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 274                                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 275                         }
 276                         break;
 277                 }
 278
 279                 tmp = cpu_to_le16(cap);
 280                 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
 281                 *pos++ = WLAN_EID_HT_CAPABILITY;
 282                 *pos++ = sizeof(struct ieee80211_ht_cap);
 283                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
 284                 memcpy(pos, &tmp, sizeof(u16));
 285                 pos += sizeof(u16);
 286                 /* TODO: needs a define here for << 2 */
 287                 *pos++ = sband->ht_cap.ampdu_factor |
 288                          (sband->ht_cap.ampdu_density << 2);
 289                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
 290         }
 291
 292         kfree(ifmgd->assocreq_ies);
 293         ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
 294         ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
 295         if (ifmgd->assocreq_ies)
 296                 memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
 297
 298         ieee80211_tx_skb(sdata, skb, 0);
 299 }
 300
 301
 302 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 303                                            u16 stype, u16 reason)
 304 {
 305         struct ieee80211_local *local = sdata->local;
 306         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 307         struct sk_buff *skb;
 308         struct ieee80211_mgmt *mgmt;
 309
 310         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 311         if (!skb) {
 312                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 313                        "deauth/disassoc frame\n", sdata->dev->name);
 314                 return;
 315         }
 316         skb_reserve(skb, local->hw.extra_tx_headroom);
 317
 318         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 319         memset(mgmt, 0, 24);
 320         memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
 321         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 322         memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
 323         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 324         skb_put(skb, 2);
 325         /* u.deauth.reason_code == u.disassoc.reason_code */
 326         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 327
 328         ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
 329 }
 330
 331 void ieee80211_send_pspoll(struct ieee80211_local *local,
 332                            struct ieee80211_sub_if_data *sdata)
 333 {
 334         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 335         struct ieee80211_pspoll *pspoll;
 336         struct sk_buff *skb;
 337         u16 fc;
 338
 339         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
 340         if (!skb) {
 341                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 342                        "pspoll frame\n", sdata->dev->name);
 343                 return;
 344         }
 345         skb_reserve(skb, local->hw.extra_tx_headroom);
 346
 347         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
 348         memset(pspoll, 0, sizeof(*pspoll));
 349         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
 350         pspoll->frame_control = cpu_to_le16(fc);
 351         pspoll->aid = cpu_to_le16(ifmgd->aid);
 352
 353         /* aid in PS-Poll has its two MSBs each set to 1 */
 354         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 355
 356         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
 357         memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
 358
 359         ieee80211_tx_skb(sdata, skb, 0);
 360 }
 361
 362 /* MLME */
 363 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 364                                      struct ieee80211_if_managed *ifmgd,
 365                                      u8 *wmm_param, size_t wmm_param_len)
 366 {
 367         struct ieee80211_tx_queue_params params;
 368         size_t left;
 369         int count;
 370         u8 *pos;
 371
 372         if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
 373                 return;
 374
 375         if (!wmm_param)
 376                 return;
 377
 378         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 379                 return;
 380         count = wmm_param[6] & 0x0f;
 381         if (count == ifmgd->wmm_last_param_set)
 382                 return;
 383         ifmgd->wmm_last_param_set = count;
 384
 385         pos = wmm_param + 8;
 386         left = wmm_param_len - 8;
 387
 388         memset(&params, 0, sizeof(params));
 389
 390         local->wmm_acm = 0;
 391         for (; left >= 4; left -= 4, pos += 4) {
 392                 int aci = (pos[0] >> 5) & 0x03;
 393                 int acm = (pos[0] >> 4) & 0x01;
 394                 int queue;
 395
 396                 switch (aci) {
 397                 case 1: /* AC_BK */
 398                         queue = 3;
 399                         if (acm)
 400                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 401                         break;
 402                 case 2: /* AC_VI */
 403                         queue = 1;
 404                         if (acm)
 405                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 406                         break;
 407                 case 3: /* AC_VO */
 408                         queue = 0;
 409                         if (acm)
 410                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 411                         break;
 412                 case 0: /* AC_BE */
 413                 default:
 414                         queue = 2;
 415                         if (acm)
 416                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 417                         break;
 418                 }
 419
 420                 params.aifs = pos[0] & 0x0f;
 421                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 422                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 423                 params.txop = get_unaligned_le16(pos + 2);
 424 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 425                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 426                        "cWmin=%d cWmax=%d txop=%d\n",
 427                        local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
 428                        params.cw_max, params.txop);
 429 #endif
 430                 if (local->ops->conf_tx &&
 431                     local->ops->conf_tx(local_to_hw(local), queue, &params)) {
 432                         printk(KERN_DEBUG "%s: failed to set TX queue "
 433                                "parameters for queue %d\n", local->mdev->name, queue);
 434                 }
 435         }
 436 }
 437
 438 static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
 439 {
 440         u8 mask;
 441         u8 index, indexn1, indexn2;
 442         struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
 443
 444         aid &= 0x3fff;
 445         index = aid / 8;
 446         mask  = 1 << (aid & 7);
 447
 448         indexn1 = tim->bitmap_ctrl & 0xfe;
 449         indexn2 = elems->tim_len + indexn1 - 4;
 450
 451         if (index < indexn1 || index > indexn2)
 452                 return false;
 453
 454         index -= indexn1;
 455
 456         return !!(tim->virtual_map[index] & mask);
 457 }
 458
 459 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 460                                            u16 capab, bool erp_valid, u8 erp)
 461 {
 462         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 463 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 464         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 465 #endif
 466         u32 changed = 0;
 467         bool use_protection;
 468         bool use_short_preamble;
 469         bool use_short_slot;
 470
 471         if (erp_valid) {
 472                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 473                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 474         } else {
 475                 use_protection = false;
 476                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 477         }
 478
 479         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 480
 481         if (use_protection != bss_conf->use_cts_prot) {
 482 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 483                 if (net_ratelimit()) {
 484                         printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
 485                                sdata->dev->name,
 486                                use_protection ? "enabled" : "disabled",
 487                                ifmgd->bssid);
 488                 }
 489 #endif
 490                 bss_conf->use_cts_prot = use_protection;
 491                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 492         }
 493
 494         if (use_short_preamble != bss_conf->use_short_preamble) {
 495 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 496                 if (net_ratelimit()) {
 497                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
 498                                " (BSSID=%pM)\n",
 499                                sdata->dev->name,
 500                                use_short_preamble ? "short" : "long",
 501                                ifmgd->bssid);
 502                 }
 503 #endif
 504                 bss_conf->use_short_preamble = use_short_preamble;
 505                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 506         }
 507
 508         if (use_short_slot != bss_conf->use_short_slot) {
 509 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 510                 if (net_ratelimit()) {
 511                         printk(KERN_DEBUG "%s: switched to %s slot time"
 512                                " (BSSID=%pM)\n",
 513                                sdata->dev->name,
 514                                use_short_slot ? "short" : "long",
 515                                ifmgd->bssid);
 516                 }
 517 #endif
 518                 bss_conf->use_short_slot = use_short_slot;
 519                 changed |= BSS_CHANGED_ERP_SLOT;
 520         }
 521
 522         return changed;
 523 }
 524
 525 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
 526 {
 527         union iwreq_data wrqu;
 528
 529         memset(&wrqu, 0, sizeof(wrqu));
 530         if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
 531                 memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
 532         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 533         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 534 }
 535
 536 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
 537 {
 538         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 539         char *buf;
 540         size_t len;
 541         int i;
 542         union iwreq_data wrqu;
 543
 544         if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
 545                 return;
 546
 547         buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
 548                                 ifmgd->assocresp_ies_len), GFP_KERNEL);
 549         if (!buf)
 550                 return;
 551
 552         len = sprintf(buf, "ASSOCINFO(");
 553         if (ifmgd->assocreq_ies) {
 554                 len += sprintf(buf + len, "ReqIEs=");
 555                 for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
 556                         len += sprintf(buf + len, "%02x",
 557                                        ifmgd->assocreq_ies[i]);
 558                 }
 559         }
 560         if (ifmgd->assocresp_ies) {
 561                 if (ifmgd->assocreq_ies)
 562                         len += sprintf(buf + len, " ");
 563                 len += sprintf(buf + len, "RespIEs=");
 564                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 565                         len += sprintf(buf + len, "%02x",
 566                                        ifmgd->assocresp_ies[i]);
 567                 }
 568         }
 569         len += sprintf(buf + len, ")");
 570
 571         if (len > IW_CUSTOM_MAX) {
 572                 len = sprintf(buf, "ASSOCRESPIE=");
 573                 for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
 574                         len += sprintf(buf + len, "%02x",
 575                                        ifmgd->assocresp_ies[i]);
 576                 }
 577         }
 578
 579         if (len <= IW_CUSTOM_MAX) {
 580                 memset(&wrqu, 0, sizeof(wrqu));
 581                 wrqu.data.length = len;
 582                 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
 583         }
 584
 585         kfree(buf);
 586 }
 587
 588
 589 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 590                                      u32 bss_info_changed)
 591 {
 592         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 593         struct ieee80211_local *local = sdata->local;
 594         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 595
 596         struct ieee80211_bss *bss;
 597
 598         bss_info_changed |= BSS_CHANGED_ASSOC;
 599         ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
 600
 601         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 602                                    conf->channel->center_freq,
 603                                    ifmgd->ssid, ifmgd->ssid_len);
 604         if (bss) {
 605                 /* set timing information */
 606                 sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
 607                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 608                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 609
 610                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 611                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 612
 613                 ieee80211_rx_bss_put(local, bss);
 614         }
 615
 616         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 617         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 618         ieee80211_sta_send_associnfo(sdata);
 619
 620         ifmgd->last_probe = jiffies;
 621         ieee80211_led_assoc(local, 1);
 622
 623         sdata->vif.bss_conf.assoc = 1;
 624         /*
 625          * For now just always ask the driver to update the basic rateset
 626          * when we have associated, we aren't checking whether it actually
 627          * changed or not.
 628          */
 629         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 630         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 631
 632         if (local->powersave) {
 633                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 634                     local->hw.conf.dynamic_ps_timeout > 0) {
 635                         mod_timer(&local->dynamic_ps_timer, jiffies +
 636                                   msecs_to_jiffies(
 637                                         local->hw.conf.dynamic_ps_timeout));
 638                 } else {
 639                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 640                                 ieee80211_send_nullfunc(local, sdata, 1);
 641                         conf->flags |= IEEE80211_CONF_PS;
 642                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 643                 }
 644         }
 645
 646         netif_tx_start_all_queues(sdata->dev);
 647         netif_carrier_on(sdata->dev);
 648
 649         ieee80211_sta_send_apinfo(sdata);
 650 }
 651
 652 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 653 {
 654         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 655         struct ieee80211_local *local = sdata->local;
 656
 657         ifmgd->direct_probe_tries++;
 658         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 659                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 660                        sdata->dev->name, ifmgd->bssid);
 661                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 662                 ieee80211_sta_send_apinfo(sdata);
 663
 664                 /*
 665                  * Most likely AP is not in the range so remove the
 666                  * bss information associated to the AP
 667                  */
 668                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 669                                 sdata->local->hw.conf.channel->center_freq,
 670                                 ifmgd->ssid, ifmgd->ssid_len);
 671
 672                 /*
 673                  * We might have a pending scan which had no chance to run yet
 674                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
 675                  * Hence, queue the STAs work again
 676                  */
 677                 queue_work(local->hw.workqueue, &ifmgd->work);
 678                 return;
 679         }
 680
 681         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 682                         sdata->dev->name, ifmgd->bssid,
 683                         ifmgd->direct_probe_tries);
 684
 685         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 686
 687         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
 688
 689         /* Direct probe is sent to broadcast address as some APs
 690          * will not answer to direct packet in unassociated state.
 691          */
 692         ieee80211_send_probe_req(sdata, NULL,
 693                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 694
 695         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 696 }
 697
 698
 699 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 700 {
 701         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 702         struct ieee80211_local *local = sdata->local;
 703         u8 *ies;
 704         size_t ies_len;
 705
 706         ifmgd->auth_tries++;
 707         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 708                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 709                        " timed out\n",
 710                        sdata->dev->name, ifmgd->bssid);
 711                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 712                 ieee80211_sta_send_apinfo(sdata);
 713                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 714                                 sdata->local->hw.conf.channel->center_freq,
 715                                 ifmgd->ssid, ifmgd->ssid_len);
 716
 717                 /*
 718                  * We might have a pending scan which had no chance to run yet
 719                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
 720                  * Hence, queue the STAs work again
 721                  */
 722                 queue_work(local->hw.workqueue, &ifmgd->work);
 723                 return;
 724         }
 725
 726         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 727         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 728                sdata->dev->name, ifmgd->bssid);
 729
 730         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 731                 ies = ifmgd->sme_auth_ie;
 732                 ies_len = ifmgd->sme_auth_ie_len;
 733         } else {
 734                 ies = NULL;
 735                 ies_len = 0;
 736         }
 737         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
 738                             ifmgd->bssid, 0);
 739         ifmgd->auth_transaction = 2;
 740
 741         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 742 }
 743
 744 /*
 745  * The disassoc 'reason' argument can be either our own reason
 746  * if self disconnected or a reason code from the AP.
 747  */
 748 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 749                                    bool deauth, bool self_disconnected,
 750                                    u16 reason)
 751 {
 752         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 753         struct ieee80211_local *local = sdata->local;
 754         struct sta_info *sta;
 755         u32 changed = 0, config_changed = 0;
 756
 757         rcu_read_lock();
 758
 759         sta = sta_info_get(local, ifmgd->bssid);
 760         if (!sta) {
 761                 rcu_read_unlock();
 762                 return;
 763         }
 764
 765         if (deauth) {
 766                 ifmgd->direct_probe_tries = 0;
 767                 ifmgd->auth_tries = 0;
 768         }
 769         ifmgd->assoc_scan_tries = 0;
 770         ifmgd->assoc_tries = 0;
 771
 772         netif_tx_stop_all_queues(sdata->dev);
 773         netif_carrier_off(sdata->dev);
 774
 775         ieee80211_sta_tear_down_BA_sessions(sta);
 776
 777         if (self_disconnected) {
 778                 if (deauth)
 779                         ieee80211_send_deauth_disassoc(sdata,
 780                                 IEEE80211_STYPE_DEAUTH, reason);
 781                 else
 782                         ieee80211_send_deauth_disassoc(sdata,
 783                                 IEEE80211_STYPE_DISASSOC, reason);
 784         }
 785
 786         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
 787         changed |= ieee80211_reset_erp_info(sdata);
 788
 789         ieee80211_led_assoc(local, 0);
 790         changed |= BSS_CHANGED_ASSOC;
 791         sdata->vif.bss_conf.assoc = false;
 792
 793         ieee80211_sta_send_apinfo(sdata);
 794
 795         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 796                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 797                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 798                                 sdata->local->hw.conf.channel->center_freq,
 799                                 ifmgd->ssid, ifmgd->ssid_len);
 800         }
 801
 802         rcu_read_unlock();
 803
 804         /* channel(_type) changes are handled by ieee80211_hw_config */
 805         local->oper_channel_type = NL80211_CHAN_NO_HT;
 806
 807         local->power_constr_level = 0;
 808
 809         del_timer_sync(&local->dynamic_ps_timer);
 810         cancel_work_sync(&local->dynamic_ps_enable_work);
 811
 812         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 813                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 814                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 815         }
 816
 817         ieee80211_hw_config(local, config_changed);
 818         ieee80211_bss_info_change_notify(sdata, changed);
 819
 820         rcu_read_lock();
 821
 822         sta = sta_info_get(local, ifmgd->bssid);
 823         if (!sta) {
 824                 rcu_read_unlock();
 825                 return;
 826         }
 827
 828         sta_info_unlink(&sta);
 829
 830         rcu_read_unlock();
 831
 832         sta_info_destroy(sta);
 833 }
 834
 835 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 836 {
 837         if (!sdata || !sdata->default_key ||
 838             sdata->default_key->conf.alg != ALG_WEP)
 839                 return 0;
 840         return 1;
 841 }
 842
 843 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
 844 {
 845         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 846         struct ieee80211_local *local = sdata->local;
 847         struct ieee80211_bss *bss;
 848         int bss_privacy;
 849         int wep_privacy;
 850         int privacy_invoked;
 851
 852         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
 853                 return 0;
 854
 855         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 856                                    local->hw.conf.channel->center_freq,
 857                                    ifmgd->ssid, ifmgd->ssid_len);
 858         if (!bss)
 859                 return 0;
 860
 861         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
 862         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 863         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
 864
 865         ieee80211_rx_bss_put(local, bss);
 866
 867         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 868                 return 0;
 869
 870         return 1;
 871 }
 872
 873 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
 874 {
 875         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 876         struct ieee80211_local *local = sdata->local;
 877
 878         ifmgd->assoc_tries++;
 879         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 880                 printk(KERN_DEBUG "%s: association with AP %pM"
 881                        " timed out\n",
 882                        sdata->dev->name, ifmgd->bssid);
 883                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 884                 ieee80211_sta_send_apinfo(sdata);
 885                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 886                                 sdata->local->hw.conf.channel->center_freq,
 887                                 ifmgd->ssid, ifmgd->ssid_len);
 888                 /*
 889                  * We might have a pending scan which had no chance to run yet
 890                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
 891                  * Hence, queue the STAs work again
 892                  */
 893                 queue_work(local->hw.workqueue, &ifmgd->work);
 894                 return;
 895         }
 896
 897         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
 898         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 899                sdata->dev->name, ifmgd->bssid);
 900         if (ieee80211_privacy_mismatch(sdata)) {
 901                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 902                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 903                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 904                 return;
 905         }
 906
 907         ieee80211_send_assoc(sdata);
 908
 909         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 910 }
 911
 912 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 913                              struct ieee80211_hdr *hdr)
 914 {
 915         /*
 916          * We can postpone the mgd.timer whenever receiving unicast frames
 917          * from AP because we know that the connection is working both ways
 918          * at that time. But multicast frames (and hence also beacons) must
 919          * be ignored here, because we need to trigger the timer during
 920          * data idle periods for sending the periodical probe request to
 921          * the AP.
 922          */
 923         if (!is_multicast_ether_addr(hdr->addr1))
 924                 mod_timer(&sdata->u.mgd.timer,
 925                           jiffies + IEEE80211_MONITORING_INTERVAL);
 926 }
 927
 928 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
 929 {
 930         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 931         struct ieee80211_local *local = sdata->local;
 932         struct sta_info *sta;
 933         int disassoc;
 934
 935         /* TODO: start monitoring current AP signal quality and number of
 936          * missed beacons. Scan other channels every now and then and search
 937          * for better APs. */
 938         /* TODO: remove expired BSSes */
 939
 940         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
 941
 942         rcu_read_lock();
 943
 944         sta = sta_info_get(local, ifmgd->bssid);
 945         if (!sta) {
 946                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
 947                        sdata->dev->name, ifmgd->bssid);
 948                 disassoc = 1;
 949         } else {
 950                 disassoc = 0;
 951                 if (time_after(jiffies,
 952                                sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 953                         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
 954                                 printk(KERN_DEBUG "%s: No ProbeResp from "
 955                                        "current AP %pM - assume out of "
 956                                        "range\n",
 957                                        sdata->dev->name, ifmgd->bssid);
 958                                 disassoc = 1;
 959                         } else
 960                                 ieee80211_send_probe_req(sdata, ifmgd->bssid,
 961                                                          ifmgd->ssid,
 962                                                          ifmgd->ssid_len,
 963                                                          NULL, 0);
 964                         ifmgd->flags ^= IEEE80211_STA_PROBEREQ_POLL;
 965                 } else {
 966                         ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
 967                         if (time_after(jiffies, ifmgd->last_probe +
 968                                        IEEE80211_PROBE_INTERVAL)) {
 969                                 ifmgd->last_probe = jiffies;
 970                                 ieee80211_send_probe_req(sdata, ifmgd->bssid,
 971                                                          ifmgd->ssid,
 972                                                          ifmgd->ssid_len,
 973                                                          NULL, 0);
 974                         }
 975                 }
 976         }
 977
 978         rcu_read_unlock();
 979
 980         if (disassoc)
 981                 ieee80211_set_disassoc(sdata, true, true,
 982                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
 983         else
 984                 mod_timer(&ifmgd->timer, jiffies +
 985                                       IEEE80211_MONITORING_INTERVAL);
 986 }
 987
 988
 989 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
 990 {
 991         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 992
 993         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
 994         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
 995         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 996                 /* Wait for SME to request association */
 997                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 998         } else
 999                 ieee80211_associate(sdata);
1000 }
1001
1002
1003 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1004                                      struct ieee80211_mgmt *mgmt,
1005                                      size_t len)
1006 {
1007         u8 *pos;
1008         struct ieee802_11_elems elems;
1009
1010         pos = mgmt->u.auth.variable;
1011         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1012         if (!elems.challenge)
1013                 return;
1014         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1015                             elems.challenge - 2, elems.challenge_len + 2,
1016                             sdata->u.mgd.bssid, 1);
1017         sdata->u.mgd.auth_transaction = 4;
1018 }
1019
1020 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1021                                    struct ieee80211_mgmt *mgmt,
1022                                    size_t len)
1023 {
1024         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1025         u16 auth_alg, auth_transaction, status_code;
1026
1027         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1028                 return;
1029
1030         if (len < 24 + 6)
1031                 return;
1032
1033         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1034                 return;
1035
1036         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1037                 return;
1038
1039         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1040         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1041         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1042
1043         if (auth_alg != ifmgd->auth_alg ||
1044             auth_transaction != ifmgd->auth_transaction)
1045                 return;
1046
1047         if (status_code != WLAN_STATUS_SUCCESS) {
1048                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1049                         u8 algs[3];
1050                         const int num_algs = ARRAY_SIZE(algs);
1051                         int i, pos;
1052                         algs[0] = algs[1] = algs[2] = 0xff;
1053                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1054                                 algs[0] = WLAN_AUTH_OPEN;
1055                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1056                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1057                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1058                                 algs[2] = WLAN_AUTH_LEAP;
1059                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1060                                 pos = 0;
1061                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1062                                 pos = 1;
1063                         else
1064                                 pos = 2;
1065                         for (i = 0; i < num_algs; i++) {
1066                                 pos++;
1067                                 if (pos >= num_algs)
1068                                         pos = 0;
1069                                 if (algs[pos] == ifmgd->auth_alg ||
1070                                     algs[pos] == 0xff)
1071                                         continue;
1072                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1073                                     !ieee80211_sta_wep_configured(sdata))
1074                                         continue;
1075                                 ifmgd->auth_alg = algs[pos];
1076                                 break;
1077                         }
1078                 }
1079                 return;
1080         }
1081
1082         switch (ifmgd->auth_alg) {
1083         case WLAN_AUTH_OPEN:
1084         case WLAN_AUTH_LEAP:
1085         case WLAN_AUTH_FT:
1086                 ieee80211_auth_completed(sdata);
1087                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1088                 break;
1089         case WLAN_AUTH_SHARED_KEY:
1090                 if (ifmgd->auth_transaction == 4) {
1091                         ieee80211_auth_completed(sdata);
1092                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1093                 } else
1094                         ieee80211_auth_challenge(sdata, mgmt, len);
1095                 break;
1096         }
1097 }
1098
1099
1100 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1101                                      struct ieee80211_mgmt *mgmt,
1102                                      size_t len)
1103 {
1104         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1105         u16 reason_code;
1106
1107         if (len < 24 + 2)
1108                 return;
1109
1110         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1111                 return;
1112
1113         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1114
1115         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1116                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1117                                 sdata->dev->name, reason_code);
1118
1119         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1120             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1121              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1122              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1123                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1124                 mod_timer(&ifmgd->timer, jiffies +
1125                                       IEEE80211_RETRY_AUTH_INTERVAL);
1126         }
1127
1128         ieee80211_set_disassoc(sdata, true, false, 0);
1129         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1130         cfg80211_send_rx_deauth(sdata->dev, (u8 *) mgmt, len);
1131 }
1132
1133
1134 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1135                                        struct ieee80211_mgmt *mgmt,
1136                                        size_t len)
1137 {
1138         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1139         u16 reason_code;
1140
1141         if (len < 24 + 2)
1142                 return;
1143
1144         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1145                 return;
1146
1147         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1148
1149         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1150                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1151                                 sdata->dev->name, reason_code);
1152
1153         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1154             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1155                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1156                 mod_timer(&ifmgd->timer, jiffies +
1157                                       IEEE80211_RETRY_AUTH_INTERVAL);
1158         }
1159
1160         ieee80211_set_disassoc(sdata, false, false, reason_code);
1161         cfg80211_send_rx_disassoc(sdata->dev, (u8 *) mgmt, len);
1162 }
1163
1164
1165 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1166                                          struct ieee80211_mgmt *mgmt,
1167                                          size_t len,
1168                                          int reassoc)
1169 {
1170         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1171         struct ieee80211_local *local = sdata->local;
1172         struct ieee80211_supported_band *sband;
1173         struct sta_info *sta;
1174         u32 rates, basic_rates;
1175         u16 capab_info, status_code, aid;
1176         struct ieee802_11_elems elems;
1177         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1178         u8 *pos;
1179         u32 changed = 0;
1180         int i, j;
1181         bool have_higher_than_11mbit = false, newsta = false;
1182         u16 ap_ht_cap_flags;
1183
1184         /* AssocResp and ReassocResp have identical structure, so process both
1185          * of them in this function. */
1186
1187         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1188                 return;
1189
1190         if (len < 24 + 6)
1191                 return;
1192
1193         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1194                 return;
1195
1196         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1197         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1198         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1199
1200         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1201                "status=%d aid=%d)\n",
1202                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1203                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1204
1205         pos = mgmt->u.assoc_resp.variable;
1206         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1207
1208         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1209             elems.timeout_int && elems.timeout_int_len == 5 &&
1210             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1211                 u32 tu, ms;
1212                 tu = get_unaligned_le32(elems.timeout_int + 1);
1213                 ms = tu * 1024 / 1000;
1214                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1215                        "comeback duration %u TU (%u ms)\n",
1216                        sdata->dev->name, tu, ms);
1217                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1218                         mod_timer(&ifmgd->timer,
1219                                   jiffies + msecs_to_jiffies(ms));
1220                 return;
1221         }
1222
1223         if (status_code != WLAN_STATUS_SUCCESS) {
1224                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1225                        sdata->dev->name, status_code);
1226                 /* if this was a reassociation, ensure we try a "full"
1227                  * association next time. This works around some broken APs
1228                  * which do not correctly reject reassociation requests. */
1229                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1230                 return;
1231         }
1232
1233         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1234                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1235                        "set\n", sdata->dev->name, aid);
1236         aid &= ~(BIT(15) | BIT(14));
1237
1238         if (!elems.supp_rates) {
1239                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1240                        sdata->dev->name);
1241                 return;
1242         }
1243
1244         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1245         ifmgd->aid = aid;
1246         ifmgd->ap_capab = capab_info;
1247
1248         kfree(ifmgd->assocresp_ies);
1249         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1250         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1251         if (ifmgd->assocresp_ies)
1252                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1253
1254         rcu_read_lock();
1255
1256         /* Add STA entry for the AP */
1257         sta = sta_info_get(local, ifmgd->bssid);
1258         if (!sta) {
1259                 newsta = true;
1260
1261                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1262                 if (!sta) {
1263                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1264                                " the AP\n", sdata->dev->name);
1265                         rcu_read_unlock();
1266                         return;
1267                 }
1268
1269                 /* update new sta with its last rx activity */
1270                 sta->last_rx = jiffies;
1271         }
1272
1273         /*
1274          * FIXME: Do we really need to update the sta_info's information here?
1275          *        We already know about the AP (we found it in our list) so it
1276          *        should already be filled with the right info, no?
1277          *        As is stands, all this is racy because typically we assume
1278          *        the information that is filled in here (except flags) doesn't
1279          *        change while a STA structure is alive. As such, it should move
1280          *        to between the sta_info_alloc() and sta_info_insert() above.
1281          */
1282
1283         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1284                            WLAN_STA_AUTHORIZED);
1285
1286         rates = 0;
1287         basic_rates = 0;
1288         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1289
1290         for (i = 0; i < elems.supp_rates_len; i++) {
1291                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1292                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1293
1294                 if (rate > 110)
1295                         have_higher_than_11mbit = true;
1296
1297                 for (j = 0; j < sband->n_bitrates; j++) {
1298                         if (sband->bitrates[j].bitrate == rate) {
1299                                 rates |= BIT(j);
1300                                 if (is_basic)
1301                                         basic_rates |= BIT(j);
1302                                 break;
1303                         }
1304                 }
1305         }
1306
1307         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1308                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1309                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1310
1311                 if (rate > 110)
1312                         have_higher_than_11mbit = true;
1313
1314                 for (j = 0; j < sband->n_bitrates; j++) {
1315                         if (sband->bitrates[j].bitrate == rate) {
1316                                 rates |= BIT(j);
1317                                 if (is_basic)
1318                                         basic_rates |= BIT(j);
1319                                 break;
1320                         }
1321                 }
1322         }
1323
1324         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1325         sdata->vif.bss_conf.basic_rates = basic_rates;
1326
1327         /* cf. IEEE 802.11 9.2.12 */
1328         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1329             have_higher_than_11mbit)
1330                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1331         else
1332                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1333
1334         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1335         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1336                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1337                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1338
1339         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1340
1341         rate_control_rate_init(sta);
1342
1343         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1344                 set_sta_flags(sta, WLAN_STA_MFP);
1345
1346         if (elems.wmm_param)
1347                 set_sta_flags(sta, WLAN_STA_WME);
1348
1349         if (newsta) {
1350                 int err = sta_info_insert(sta);
1351                 if (err) {
1352                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1353                                " the AP (error %d)\n", sdata->dev->name, err);
1354                         rcu_read_unlock();
1355                         return;
1356                 }
1357         }
1358
1359         rcu_read_unlock();
1360
1361         if (elems.wmm_param)
1362                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1363                                          elems.wmm_param_len);
1364
1365         if (elems.ht_info_elem && elems.wmm_param &&
1366             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1367             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1368                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1369                                                ap_ht_cap_flags);
1370
1371         /* set AID and assoc capability,
1372          * ieee80211_set_associated() will tell the driver */
1373         bss_conf->aid = aid;
1374         bss_conf->assoc_capability = capab_info;
1375         ieee80211_set_associated(sdata, changed);
1376
1377         ieee80211_associated(sdata);
1378         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1379 }
1380
1381
1382 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1383                                   struct ieee80211_mgmt *mgmt,
1384                                   size_t len,
1385                                   struct ieee80211_rx_status *rx_status,
1386                                   struct ieee802_11_elems *elems,
1387                                   bool beacon)
1388 {
1389         struct ieee80211_local *local = sdata->local;
1390         int freq;
1391         struct ieee80211_bss *bss;
1392         struct ieee80211_channel *channel;
1393
1394         if (elems->ds_params && elems->ds_params_len == 1)
1395                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1396         else
1397                 freq = rx_status->freq;
1398
1399         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1400
1401         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1402                 return;
1403
1404         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1405                                         channel, beacon);
1406         if (!bss)
1407                 return;
1408
1409         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1410             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1411                 struct ieee80211_channel_sw_ie *sw_elem =
1412                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1413                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1414         }
1415
1416         ieee80211_rx_bss_put(local, bss);
1417 }
1418
1419
1420 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1421                                          struct ieee80211_mgmt *mgmt,
1422                                          size_t len,
1423                                          struct ieee80211_rx_status *rx_status)
1424 {
1425         size_t baselen;
1426         struct ieee802_11_elems elems;
1427
1428         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1429                 return; /* ignore ProbeResp to foreign address */
1430
1431         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1432         if (baselen > len)
1433                 return;
1434
1435         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1436                                 &elems);
1437
1438         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1439
1440         /* direct probe may be part of the association flow */
1441         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1442             &sdata->u.mgd.request)) {
1443                 printk(KERN_DEBUG "%s direct probe responded\n",
1444                        sdata->dev->name);
1445                 ieee80211_authenticate(sdata);
1446         }
1447 }
1448
1449 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1450                                      struct ieee80211_mgmt *mgmt,
1451                                      size_t len,
1452                                      struct ieee80211_rx_status *rx_status)
1453 {
1454         struct ieee80211_if_managed *ifmgd;
1455         size_t baselen;
1456         struct ieee802_11_elems elems;
1457         struct ieee80211_local *local = sdata->local;
1458         u32 changed = 0;
1459         bool erp_valid, directed_tim;
1460         u8 erp_value = 0;
1461
1462         /* Process beacon from the current BSS */
1463         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1464         if (baselen > len)
1465                 return;
1466
1467         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1468
1469         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1470
1471         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1472                 return;
1473
1474         ifmgd = &sdata->u.mgd;
1475
1476         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1477             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1478                 return;
1479
1480         if (rx_status->freq != local->hw.conf.channel->center_freq)
1481                 return;
1482
1483         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1484                                  elems.wmm_param_len);
1485
1486         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1487                 directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
1488
1489                 if (directed_tim) {
1490                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1491                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1492                                 ieee80211_hw_config(local,
1493                                                     IEEE80211_CONF_CHANGE_PS);
1494                                 ieee80211_send_nullfunc(local, sdata, 0);
1495                         } else {
1496                                 local->pspolling = true;
1497
1498                                 /*
1499                                  * Here is assumed that the driver will be
1500                                  * able to send ps-poll frame and receive a
1501                                  * response even though power save mode is
1502                                  * enabled, but some drivers might require
1503                                  * to disable power save here. This needs
1504                                  * to be investigated.
1505                                  */
1506                                 ieee80211_send_pspoll(local, sdata);
1507                         }
1508                 }
1509         }
1510
1511         if (elems.erp_info && elems.erp_info_len >= 1) {
1512                 erp_valid = true;
1513                 erp_value = elems.erp_info[0];
1514         } else {
1515                 erp_valid = false;
1516         }
1517         changed |= ieee80211_handle_bss_capability(sdata,
1518                         le16_to_cpu(mgmt->u.beacon.capab_info),
1519                         erp_valid, erp_value);
1520
1521
1522         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1523             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1524                 struct sta_info *sta;
1525                 struct ieee80211_supported_band *sband;
1526                 u16 ap_ht_cap_flags;
1527
1528                 rcu_read_lock();
1529
1530                 sta = sta_info_get(local, ifmgd->bssid);
1531                 if (!sta) {
1532                         rcu_read_unlock();
1533                         return;
1534                 }
1535
1536                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1537
1538                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1539                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1540
1541                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1542
1543                 rcu_read_unlock();
1544
1545                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1546                                                ap_ht_cap_flags);
1547         }
1548
1549         if (elems.country_elem) {
1550                 /* Note we are only reviewing this on beacons
1551                  * for the BSSID we are associated to */
1552                 regulatory_hint_11d(local->hw.wiphy,
1553                         elems.country_elem, elems.country_elem_len);
1554
1555                 /* TODO: IBSS also needs this */
1556                 if (elems.pwr_constr_elem)
1557                         ieee80211_handle_pwr_constr(sdata,
1558                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1559                                 elems.pwr_constr_elem,
1560                                 elems.pwr_constr_elem_len);
1561         }
1562
1563         ieee80211_bss_info_change_notify(sdata, changed);
1564 }
1565
1566 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1567                                           struct sk_buff *skb,
1568                                           struct ieee80211_rx_status *rx_status)
1569 {
1570         struct ieee80211_local *local = sdata->local;
1571         struct ieee80211_mgmt *mgmt;
1572         u16 fc;
1573
1574         if (skb->len < 24)
1575                 return RX_DROP_MONITOR;
1576
1577         mgmt = (struct ieee80211_mgmt *) skb->data;
1578         fc = le16_to_cpu(mgmt->frame_control);
1579
1580         switch (fc & IEEE80211_FCTL_STYPE) {
1581         case IEEE80211_STYPE_PROBE_REQ:
1582         case IEEE80211_STYPE_PROBE_RESP:
1583         case IEEE80211_STYPE_BEACON:
1584                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1585         case IEEE80211_STYPE_AUTH:
1586         case IEEE80211_STYPE_ASSOC_RESP:
1587         case IEEE80211_STYPE_REASSOC_RESP:
1588         case IEEE80211_STYPE_DEAUTH:
1589         case IEEE80211_STYPE_DISASSOC:
1590                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1591                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1592                 return RX_QUEUED;
1593         }
1594
1595         return RX_DROP_MONITOR;
1596 }
1597
1598 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1599                                          struct sk_buff *skb)
1600 {
1601         struct ieee80211_rx_status *rx_status;
1602         struct ieee80211_mgmt *mgmt;
1603         u16 fc;
1604
1605         rx_status = (struct ieee80211_rx_status *) skb->cb;
1606         mgmt = (struct ieee80211_mgmt *) skb->data;
1607         fc = le16_to_cpu(mgmt->frame_control);
1608
1609         switch (fc & IEEE80211_FCTL_STYPE) {
1610         case IEEE80211_STYPE_PROBE_RESP:
1611                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1612                                              rx_status);
1613                 break;
1614         case IEEE80211_STYPE_BEACON:
1615                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1616                                          rx_status);
1617                 break;
1618         case IEEE80211_STYPE_AUTH:
1619                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1620                 break;
1621         case IEEE80211_STYPE_ASSOC_RESP:
1622                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1623                 break;
1624         case IEEE80211_STYPE_REASSOC_RESP:
1625                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1626                 break;
1627         case IEEE80211_STYPE_DEAUTH:
1628                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1629                 break;
1630         case IEEE80211_STYPE_DISASSOC:
1631                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1632                 break;
1633         }
1634
1635         kfree_skb(skb);
1636 }
1637
1638 static void ieee80211_sta_timer(unsigned long data)
1639 {
1640         struct ieee80211_sub_if_data *sdata =
1641                 (struct ieee80211_sub_if_data *) data;
1642         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1643         struct ieee80211_local *local = sdata->local;
1644
1645         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1646         queue_work(local->hw.workqueue, &ifmgd->work);
1647 }
1648
1649 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1650 {
1651         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1652         struct ieee80211_local *local = sdata->local;
1653
1654         if (local->ops->reset_tsf) {
1655                 /* Reset own TSF to allow time synchronization work. */
1656                 local->ops->reset_tsf(local_to_hw(local));
1657         }
1658
1659         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1660
1661
1662         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1663                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1664         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1665                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1666         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1667                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1668         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
1669                 ifmgd->auth_alg = WLAN_AUTH_FT;
1670         else
1671                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1672         ifmgd->auth_transaction = -1;
1673         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1674         ifmgd->assoc_scan_tries = 0;
1675         ifmgd->direct_probe_tries = 0;
1676         ifmgd->auth_tries = 0;
1677         ifmgd->assoc_tries = 0;
1678         netif_tx_stop_all_queues(sdata->dev);
1679         netif_carrier_off(sdata->dev);
1680 }
1681
1682 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
1683 {
1684         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1685         struct ieee80211_local *local = sdata->local;
1686         struct ieee80211_bss *bss;
1687         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
1688         u8 ssid_len = ifmgd->ssid_len;
1689         u16 capa_mask = WLAN_CAPABILITY_ESS;
1690         u16 capa_val = WLAN_CAPABILITY_ESS;
1691         struct ieee80211_channel *chan = local->oper_channel;
1692
1693         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1694             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
1695                             IEEE80211_STA_AUTO_BSSID_SEL |
1696                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
1697                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
1698                 if (sdata->default_key)
1699                         capa_val |= WLAN_CAPABILITY_PRIVACY;
1700         }
1701
1702         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
1703                 chan = NULL;
1704
1705         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1706                 bssid = NULL;
1707
1708         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
1709                 ssid = NULL;
1710                 ssid_len = 0;
1711         }
1712
1713         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
1714                                        bssid, ssid, ssid_len,
1715                                        capa_mask, capa_val);
1716
1717         if (bss) {
1718                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
1719                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
1720                         ieee80211_sta_set_ssid(sdata, bss->ssid,
1721                                                bss->ssid_len);
1722                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
1723                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
1724                                                     bss->supp_rates);
1725                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
1726                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
1727                 else
1728                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
1729
1730                 /* Send out direct probe if no probe resp was received or
1731                  * the one we have is outdated
1732                  */
1733                 if (!bss->last_probe_resp ||
1734                     time_after(jiffies, bss->last_probe_resp
1735                                         + IEEE80211_SCAN_RESULT_EXPIRE))
1736                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1737                 else
1738                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1739
1740                 ieee80211_rx_bss_put(local, bss);
1741                 ieee80211_sta_reset_auth(sdata);
1742                 return 0;
1743         } else {
1744                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
1745                         ifmgd->assoc_scan_tries++;
1746                         /* XXX maybe racy? */
1747                         if (local->scan_req)
1748                                 return -1;
1749                         memcpy(local->int_scan_req.ssids[0].ssid,
1750                                ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
1751                         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
1752                                 local->int_scan_req.ssids[0].ssid_len = 0;
1753                         else
1754                                 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
1755
1756                         if (ieee80211_start_scan(sdata, &local->int_scan_req))
1757                                 ieee80211_scan_failed(local);
1758
1759                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1760                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1761                 } else {
1762                         ifmgd->assoc_scan_tries = 0;
1763                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1764                 }
1765         }
1766         return -1;
1767 }
1768
1769
1770 static void ieee80211_sta_work(struct work_struct *work)
1771 {
1772         struct ieee80211_sub_if_data *sdata =
1773                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1774         struct ieee80211_local *local = sdata->local;
1775         struct ieee80211_if_managed *ifmgd;
1776         struct sk_buff *skb;
1777
1778         if (!netif_running(sdata->dev))
1779                 return;
1780
1781         if (local->sw_scanning || local->hw_scanning)
1782                 return;
1783
1784         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1785                 return;
1786         ifmgd = &sdata->u.mgd;
1787
1788         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1789                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1790
1791         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
1792             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1793             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
1794             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
1795                 /*
1796                  * The call to ieee80211_start_scan can fail but ieee80211_request_scan
1797                  * (which queued ieee80211_sta_work) did not return an error. Thus, call
1798                  * ieee80211_scan_failed here if ieee80211_start_scan fails in order to
1799                  * notify the scan requester.
1800                  */
1801                 if (ieee80211_start_scan(sdata, local->scan_req))
1802                         ieee80211_scan_failed(local);
1803                 return;
1804         }
1805
1806         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
1807                 if (ieee80211_sta_config_auth(sdata))
1808                         return;
1809                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1810         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
1811                 return;
1812
1813         switch (ifmgd->state) {
1814         case IEEE80211_STA_MLME_DISABLED:
1815                 break;
1816         case IEEE80211_STA_MLME_DIRECT_PROBE:
1817                 ieee80211_direct_probe(sdata);
1818                 break;
1819         case IEEE80211_STA_MLME_AUTHENTICATE:
1820                 ieee80211_authenticate(sdata);
1821                 break;
1822         case IEEE80211_STA_MLME_ASSOCIATE:
1823                 ieee80211_associate(sdata);
1824                 break;
1825         case IEEE80211_STA_MLME_ASSOCIATED:
1826                 ieee80211_associated(sdata);
1827                 break;
1828         default:
1829                 WARN_ON(1);
1830                 break;
1831         }
1832
1833         if (ieee80211_privacy_mismatch(sdata)) {
1834                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
1835                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
1836
1837                 ieee80211_set_disassoc(sdata, false, true,
1838                                         WLAN_REASON_UNSPECIFIED);
1839         }
1840 }
1841
1842 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1843 {
1844         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1845                 queue_work(sdata->local->hw.workqueue,
1846                            &sdata->u.mgd.work);
1847 }
1848
1849 /* interface setup */
1850 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1851 {
1852         struct ieee80211_if_managed *ifmgd;
1853
1854         ifmgd = &sdata->u.mgd;
1855         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1856         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1857         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1858                     (unsigned long) sdata);
1859         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1860                     (unsigned long) sdata);
1861         skb_queue_head_init(&ifmgd->skb_queue);
1862
1863         ifmgd->capab = WLAN_CAPABILITY_ESS;
1864         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
1865                 IEEE80211_AUTH_ALG_SHARED_KEY;
1866         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
1867                 IEEE80211_STA_AUTO_BSSID_SEL |
1868                 IEEE80211_STA_AUTO_CHANNEL_SEL;
1869         if (sdata->local->hw.queues >= 4)
1870                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
1871 }
1872
1873 /* configuration hooks */
1874 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
1875 {
1876         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1877         struct ieee80211_local *local = sdata->local;
1878
1879         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1880                 return;
1881
1882         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
1883                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
1884             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
1885                              IEEE80211_STA_AUTO_SSID_SEL))) {
1886
1887                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
1888                         ieee80211_set_disassoc(sdata, true, true,
1889                                                WLAN_REASON_DEAUTH_LEAVING);
1890
1891                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
1892                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1893                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1894                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
1895                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1896                 queue_work(local->hw.workqueue, &ifmgd->work);
1897         }
1898 }
1899
1900 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
1901 {
1902         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1903
1904         if (ifmgd->ssid_len)
1905                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
1906         else
1907                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
1908
1909         return 0;
1910 }
1911
1912 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
1913 {
1914         struct ieee80211_if_managed *ifmgd;
1915
1916         if (len > IEEE80211_MAX_SSID_LEN)
1917                 return -EINVAL;
1918
1919         ifmgd = &sdata->u.mgd;
1920
1921         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
1922                 /*
1923                  * Do not use reassociation if SSID is changed (different ESS).
1924                  */
1925                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1926                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
1927                 memcpy(ifmgd->ssid, ssid, len);
1928                 ifmgd->ssid_len = len;
1929         }
1930
1931         return ieee80211_sta_commit(sdata);
1932 }
1933
1934 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
1935 {
1936         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1937         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
1938         *len = ifmgd->ssid_len;
1939         return 0;
1940 }
1941
1942 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
1943 {
1944         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1945
1946         if (is_valid_ether_addr(bssid)) {
1947                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
1948                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
1949         } else {
1950                 memset(ifmgd->bssid, 0, ETH_ALEN);
1951                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
1952         }
1953
1954         if (netif_running(sdata->dev)) {
1955                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
1956                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
1957                                "the low-level driver\n", sdata->dev->name);
1958                 }
1959         }
1960
1961         return ieee80211_sta_commit(sdata);
1962 }
1963
1964 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
1965                                const char *ie, size_t len)
1966 {
1967         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1968
1969         kfree(ifmgd->extra_ie);
1970         if (len == 0) {
1971                 ifmgd->extra_ie = NULL;
1972                 ifmgd->extra_ie_len = 0;
1973                 return 0;
1974         }
1975         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
1976         if (!ifmgd->extra_ie) {
1977                 ifmgd->extra_ie_len = 0;
1978                 return -ENOMEM;
1979         }
1980         memcpy(ifmgd->extra_ie, ie, len);
1981         ifmgd->extra_ie_len = len;
1982         return 0;
1983 }
1984
1985 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
1986 {
1987         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
1988                sdata->dev->name, reason);
1989
1990         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1991                 return -EINVAL;
1992
1993         ieee80211_set_disassoc(sdata, true, true, reason);
1994         return 0;
1995 }
1996
1997 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
1998 {
1999         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2000
2001         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2002                sdata->dev->name, reason);
2003
2004         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2005                 return -EINVAL;
2006
2007         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2008                 return -ENOLINK;
2009
2010         ieee80211_set_disassoc(sdata, false, true, reason);
2011         return 0;
2012 }
2013
2014 /* scan finished notification */
2015 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2016 {
2017         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2018
2019         /* Restart STA timers */
2020         rcu_read_lock();
2021         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2022                 ieee80211_restart_sta_timer(sdata);
2023         rcu_read_unlock();
2024 }
2025
2026 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2027 {
2028         struct ieee80211_local *local =
2029                 container_of(work, struct ieee80211_local,
2030                              dynamic_ps_disable_work);
2031
2032         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2033                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2034                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2035         }
2036
2037         ieee80211_wake_queues_by_reason(&local->hw,
2038                                         IEEE80211_QUEUE_STOP_REASON_PS);
2039 }
2040
2041 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2042 {
2043         struct ieee80211_local *local =
2044                 container_of(work, struct ieee80211_local,
2045                              dynamic_ps_enable_work);
2046         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2047
2048         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2049                 return;
2050
2051         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2052                 ieee80211_send_nullfunc(local, sdata, 1);
2053
2054         local->hw.conf.flags |= IEEE80211_CONF_PS;
2055         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2056 }
2057
2058 void ieee80211_dynamic_ps_timer(unsigned long data)
2059 {
2060         struct ieee80211_local *local = (void *) data;
2061
2062         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2063 }
2064
2065 void ieee80211_send_nullfunc(struct ieee80211_local *local,
2066                              struct ieee80211_sub_if_data *sdata,
2067                              int powersave)
2068 {
2069         struct sk_buff *skb;
2070         struct ieee80211_hdr *nullfunc;
2071         __le16 fc;
2072
2073         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2074                 return;
2075
2076         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2077         if (!skb) {
2078                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2079                        "frame\n", sdata->dev->name);
2080                 return;
2081         }
2082         skb_reserve(skb, local->hw.extra_tx_headroom);
2083
2084         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2085         memset(nullfunc, 0, 24);
2086         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2087                          IEEE80211_FCTL_TODS);
2088         if (powersave)
2089                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
2090         nullfunc->frame_control = fc;
2091         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2092         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2093         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2094
2095         ieee80211_tx_skb(sdata, skb, 0);
2096 }