SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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_IDLE_TIME (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                 cfg80211_hold_bss(&bss->cbss);
 614
 615                 ieee80211_rx_bss_put(local, bss);
 616         }
 617
 618         ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
 619         memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
 620         ieee80211_sta_send_associnfo(sdata);
 621
 622         ifmgd->last_probe = jiffies;
 623         ieee80211_led_assoc(local, 1);
 624
 625         sdata->vif.bss_conf.assoc = 1;
 626         /*
 627          * For now just always ask the driver to update the basic rateset
 628          * when we have associated, we aren't checking whether it actually
 629          * changed or not.
 630          */
 631         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 632         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 633
 634         if (local->powersave) {
 635                 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
 636                     local->hw.conf.dynamic_ps_timeout > 0) {
 637                         mod_timer(&local->dynamic_ps_timer, jiffies +
 638                                   msecs_to_jiffies(
 639                                         local->hw.conf.dynamic_ps_timeout));
 640                 } else {
 641                         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 642                                 ieee80211_send_nullfunc(local, sdata, 1);
 643                         conf->flags |= IEEE80211_CONF_PS;
 644                         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 645                 }
 646         }
 647
 648         netif_tx_start_all_queues(sdata->dev);
 649         netif_carrier_on(sdata->dev);
 650
 651         ieee80211_sta_send_apinfo(sdata);
 652 }
 653
 654 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
 655 {
 656         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 657         struct ieee80211_local *local = sdata->local;
 658
 659         ifmgd->direct_probe_tries++;
 660         if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
 661                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
 662                        sdata->dev->name, ifmgd->bssid);
 663                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 664                 ieee80211_sta_send_apinfo(sdata);
 665
 666                 /*
 667                  * Most likely AP is not in the range so remove the
 668                  * bss information associated to the AP
 669                  */
 670                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 671                                 sdata->local->hw.conf.channel->center_freq,
 672                                 ifmgd->ssid, ifmgd->ssid_len);
 673
 674                 /*
 675                  * We might have a pending scan which had no chance to run yet
 676                  * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
 677                  * Hence, queue the STAs work again
 678                  */
 679                 queue_work(local->hw.workqueue, &ifmgd->work);
 680                 return;
 681         }
 682
 683         printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
 684                         sdata->dev->name, ifmgd->bssid,
 685                         ifmgd->direct_probe_tries);
 686
 687         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
 688
 689         set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
 690
 691         /* Direct probe is sent to broadcast address as some APs
 692          * will not answer to direct packet in unassociated state.
 693          */
 694         ieee80211_send_probe_req(sdata, NULL,
 695                                  ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
 696
 697         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 698 }
 699
 700
 701 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
 702 {
 703         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 704         struct ieee80211_local *local = sdata->local;
 705         u8 *ies;
 706         size_t ies_len;
 707
 708         ifmgd->auth_tries++;
 709         if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
 710                 printk(KERN_DEBUG "%s: authentication with AP %pM"
 711                        " timed out\n",
 712                        sdata->dev->name, ifmgd->bssid);
 713                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 714                 ieee80211_sta_send_apinfo(sdata);
 715                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 716                                 sdata->local->hw.conf.channel->center_freq,
 717                                 ifmgd->ssid, ifmgd->ssid_len);
 718
 719                 /*
 720                  * We might have a pending scan which had no chance to run yet
 721                  * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
 722                  * Hence, queue the STAs work again
 723                  */
 724                 queue_work(local->hw.workqueue, &ifmgd->work);
 725                 return;
 726         }
 727
 728         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
 729         printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
 730                sdata->dev->name, ifmgd->bssid);
 731
 732         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
 733                 ies = ifmgd->sme_auth_ie;
 734                 ies_len = ifmgd->sme_auth_ie_len;
 735         } else {
 736                 ies = NULL;
 737                 ies_len = 0;
 738         }
 739         ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
 740                             ifmgd->bssid, 0);
 741         ifmgd->auth_transaction = 2;
 742
 743         mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
 744 }
 745
 746 /*
 747  * The disassoc 'reason' argument can be either our own reason
 748  * if self disconnected or a reason code from the AP.
 749  */
 750 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 751                                    bool deauth, bool self_disconnected,
 752                                    u16 reason)
 753 {
 754         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 755         struct ieee80211_local *local = sdata->local;
 756         struct ieee80211_conf *conf = &local_to_hw(local)->conf;
 757         struct ieee80211_bss *bss;
 758         struct sta_info *sta;
 759         u32 changed = 0, config_changed = 0;
 760
 761         rcu_read_lock();
 762
 763         sta = sta_info_get(local, ifmgd->bssid);
 764         if (!sta) {
 765                 rcu_read_unlock();
 766                 return;
 767         }
 768
 769         if (deauth) {
 770                 ifmgd->direct_probe_tries = 0;
 771                 ifmgd->auth_tries = 0;
 772         }
 773         ifmgd->assoc_scan_tries = 0;
 774         ifmgd->assoc_tries = 0;
 775
 776         netif_tx_stop_all_queues(sdata->dev);
 777         netif_carrier_off(sdata->dev);
 778
 779         ieee80211_sta_tear_down_BA_sessions(sta);
 780
 781         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 782                                    conf->channel->center_freq,
 783                                    ifmgd->ssid, ifmgd->ssid_len);
 784
 785         if (bss) {
 786                 cfg80211_unhold_bss(&bss->cbss);
 787                 ieee80211_rx_bss_put(local, bss);
 788         }
 789
 790         if (self_disconnected) {
 791                 if (deauth)
 792                         ieee80211_send_deauth_disassoc(sdata,
 793                                 IEEE80211_STYPE_DEAUTH, reason);
 794                 else
 795                         ieee80211_send_deauth_disassoc(sdata,
 796                                 IEEE80211_STYPE_DISASSOC, reason);
 797         }
 798
 799         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
 800         changed |= ieee80211_reset_erp_info(sdata);
 801
 802         ieee80211_led_assoc(local, 0);
 803         changed |= BSS_CHANGED_ASSOC;
 804         sdata->vif.bss_conf.assoc = false;
 805
 806         ieee80211_sta_send_apinfo(sdata);
 807
 808         if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
 809                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 810                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 811                                 sdata->local->hw.conf.channel->center_freq,
 812                                 ifmgd->ssid, ifmgd->ssid_len);
 813         }
 814
 815         rcu_read_unlock();
 816
 817         /* channel(_type) changes are handled by ieee80211_hw_config */
 818         local->oper_channel_type = NL80211_CHAN_NO_HT;
 819
 820         local->power_constr_level = 0;
 821
 822         del_timer_sync(&local->dynamic_ps_timer);
 823         cancel_work_sync(&local->dynamic_ps_enable_work);
 824
 825         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 826                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 827                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 828         }
 829
 830         ieee80211_hw_config(local, config_changed);
 831         ieee80211_bss_info_change_notify(sdata, changed);
 832
 833         rcu_read_lock();
 834
 835         sta = sta_info_get(local, ifmgd->bssid);
 836         if (!sta) {
 837                 rcu_read_unlock();
 838                 return;
 839         }
 840
 841         sta_info_unlink(&sta);
 842
 843         rcu_read_unlock();
 844
 845         sta_info_destroy(sta);
 846 }
 847
 848 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
 849 {
 850         if (!sdata || !sdata->default_key ||
 851             sdata->default_key->conf.alg != ALG_WEP)
 852                 return 0;
 853         return 1;
 854 }
 855
 856 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
 857 {
 858         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 859         struct ieee80211_local *local = sdata->local;
 860         struct ieee80211_bss *bss;
 861         int bss_privacy;
 862         int wep_privacy;
 863         int privacy_invoked;
 864
 865         if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
 866                 return 0;
 867
 868         bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
 869                                    local->hw.conf.channel->center_freq,
 870                                    ifmgd->ssid, ifmgd->ssid_len);
 871         if (!bss)
 872                 return 0;
 873
 874         bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
 875         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
 876         privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
 877
 878         ieee80211_rx_bss_put(local, bss);
 879
 880         if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
 881                 return 0;
 882
 883         return 1;
 884 }
 885
 886 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
 887 {
 888         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 889         struct ieee80211_local *local = sdata->local;
 890
 891         ifmgd->assoc_tries++;
 892         if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
 893                 printk(KERN_DEBUG "%s: association with AP %pM"
 894                        " timed out\n",
 895                        sdata->dev->name, ifmgd->bssid);
 896                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 897                 ieee80211_sta_send_apinfo(sdata);
 898                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
 899                                 sdata->local->hw.conf.channel->center_freq,
 900                                 ifmgd->ssid, ifmgd->ssid_len);
 901                 /*
 902                  * We might have a pending scan which had no chance to run yet
 903                  * due to state == IEEE80211_STA_MLME_ASSOCIATE.
 904                  * Hence, queue the STAs work again
 905                  */
 906                 queue_work(local->hw.workqueue, &ifmgd->work);
 907                 return;
 908         }
 909
 910         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
 911         printk(KERN_DEBUG "%s: associate with AP %pM\n",
 912                sdata->dev->name, ifmgd->bssid);
 913         if (ieee80211_privacy_mismatch(sdata)) {
 914                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
 915                        "mixed-cell disabled - abort association\n", sdata->dev->name);
 916                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
 917                 return;
 918         }
 919
 920         ieee80211_send_assoc(sdata);
 921
 922         mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
 923 }
 924
 925 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 926                              struct ieee80211_hdr *hdr)
 927 {
 928         /*
 929          * We can postpone the mgd.timer whenever receiving unicast frames
 930          * from AP because we know that the connection is working both ways
 931          * at that time. But multicast frames (and hence also beacons) must
 932          * be ignored here, because we need to trigger the timer during
 933          * data idle periods for sending the periodical probe request to
 934          * the AP.
 935          */
 936         if (!is_multicast_ether_addr(hdr->addr1))
 937                 mod_timer(&sdata->u.mgd.timer,
 938                           jiffies + IEEE80211_MONITORING_INTERVAL);
 939 }
 940
 941 void ieee80211_beacon_loss_work(struct work_struct *work)
 942 {
 943         struct ieee80211_sub_if_data *sdata =
 944                 container_of(work, struct ieee80211_sub_if_data,
 945                              u.mgd.beacon_loss_work);
 946         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 947
 948 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 949         if (net_ratelimit()) {
 950                 printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
 951                        "- sending probe request\n", sdata->dev->name,
 952                        sdata->u.mgd.bssid);
 953         }
 954 #endif
 955
 956         ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
 957         ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
 958                                  ifmgd->ssid_len, NULL, 0);
 959
 960         mod_timer(&ifmgd->timer, jiffies + IEEE80211_MONITORING_INTERVAL);
 961 }
 962
 963 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
 964 {
 965         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 966
 967         queue_work(sdata->local->hw.workqueue,
 968                    &sdata->u.mgd.beacon_loss_work);
 969 }
 970 EXPORT_SYMBOL(ieee80211_beacon_loss);
 971
 972 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
 973 {
 974         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 975         struct ieee80211_local *local = sdata->local;
 976         struct sta_info *sta;
 977         bool disassoc = false;
 978
 979         /* TODO: start monitoring current AP signal quality and number of
 980          * missed beacons. Scan other channels every now and then and search
 981          * for better APs. */
 982         /* TODO: remove expired BSSes */
 983
 984         ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
 985
 986         rcu_read_lock();
 987
 988         sta = sta_info_get(local, ifmgd->bssid);
 989         if (!sta) {
 990                 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
 991                        sdata->dev->name, ifmgd->bssid);
 992                 disassoc = true;
 993                 goto unlock;
 994         }
 995
 996         if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
 997             time_after(jiffies, sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
 998                 printk(KERN_DEBUG "%s: no probe response from AP %pM "
 999                        "- disassociating\n",
1000                        sdata->dev->name, ifmgd->bssid);
1001                 disassoc = true;
1002                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1003                 goto unlock;
1004         }
1005
1006         /*
1007          * Beacon filtering is only enabled with power save and then the
1008          * stack should not check for beacon loss.
1009          */
1010         if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
1011               (local->hw.conf.flags & IEEE80211_CONF_PS)) &&
1012             time_after(jiffies,
1013                        ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
1014 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1015                 if (net_ratelimit()) {
1016                         printk(KERN_DEBUG "%s: beacon loss from AP %pM "
1017                                "- sending probe request\n",
1018                                sdata->dev->name, ifmgd->bssid);
1019                 }
1020 #endif
1021                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1022                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1023                                          ifmgd->ssid_len, NULL, 0);
1024                 goto unlock;
1025
1026         }
1027
1028         if (time_after(jiffies, sta->last_rx + IEEE80211_PROBE_IDLE_TIME)) {
1029                 ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
1030                 ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
1031                                          ifmgd->ssid_len, NULL, 0);
1032         }
1033
1034  unlock:
1035         rcu_read_unlock();
1036
1037         if (disassoc)
1038                 ieee80211_set_disassoc(sdata, true, true,
1039                                         WLAN_REASON_PREV_AUTH_NOT_VALID);
1040         else
1041                 mod_timer(&ifmgd->timer, jiffies +
1042                                       IEEE80211_MONITORING_INTERVAL);
1043 }
1044
1045
1046 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
1047 {
1048         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1049
1050         printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1051         ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
1052         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
1053                 /* Wait for SME to request association */
1054                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1055         } else
1056                 ieee80211_associate(sdata);
1057 }
1058
1059
1060 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1061                                      struct ieee80211_mgmt *mgmt,
1062                                      size_t len)
1063 {
1064         u8 *pos;
1065         struct ieee802_11_elems elems;
1066
1067         pos = mgmt->u.auth.variable;
1068         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1069         if (!elems.challenge)
1070                 return;
1071         ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg,
1072                             elems.challenge - 2, elems.challenge_len + 2,
1073                             sdata->u.mgd.bssid, 1);
1074         sdata->u.mgd.auth_transaction = 4;
1075 }
1076
1077 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1078                                    struct ieee80211_mgmt *mgmt,
1079                                    size_t len)
1080 {
1081         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1082         u16 auth_alg, auth_transaction, status_code;
1083
1084         if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
1085                 return;
1086
1087         if (len < 24 + 6)
1088                 return;
1089
1090         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1091                 return;
1092
1093         if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1094                 return;
1095
1096         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1097         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1098         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1099
1100         if (auth_alg != ifmgd->auth_alg ||
1101             auth_transaction != ifmgd->auth_transaction)
1102                 return;
1103
1104         if (status_code != WLAN_STATUS_SUCCESS) {
1105                 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
1106                         u8 algs[3];
1107                         const int num_algs = ARRAY_SIZE(algs);
1108                         int i, pos;
1109                         algs[0] = algs[1] = algs[2] = 0xff;
1110                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1111                                 algs[0] = WLAN_AUTH_OPEN;
1112                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1113                                 algs[1] = WLAN_AUTH_SHARED_KEY;
1114                         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1115                                 algs[2] = WLAN_AUTH_LEAP;
1116                         if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
1117                                 pos = 0;
1118                         else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
1119                                 pos = 1;
1120                         else
1121                                 pos = 2;
1122                         for (i = 0; i < num_algs; i++) {
1123                                 pos++;
1124                                 if (pos >= num_algs)
1125                                         pos = 0;
1126                                 if (algs[pos] == ifmgd->auth_alg ||
1127                                     algs[pos] == 0xff)
1128                                         continue;
1129                                 if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1130                                     !ieee80211_sta_wep_configured(sdata))
1131                                         continue;
1132                                 ifmgd->auth_alg = algs[pos];
1133                                 break;
1134                         }
1135                 }
1136                 return;
1137         }
1138
1139         switch (ifmgd->auth_alg) {
1140         case WLAN_AUTH_OPEN:
1141         case WLAN_AUTH_LEAP:
1142         case WLAN_AUTH_FT:
1143                 ieee80211_auth_completed(sdata);
1144                 cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1145                 break;
1146         case WLAN_AUTH_SHARED_KEY:
1147                 if (ifmgd->auth_transaction == 4) {
1148                         ieee80211_auth_completed(sdata);
1149                         cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
1150                 } else
1151                         ieee80211_auth_challenge(sdata, mgmt, len);
1152                 break;
1153         }
1154 }
1155
1156
1157 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1158                                      struct ieee80211_mgmt *mgmt,
1159                                      size_t len)
1160 {
1161         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1162         u16 reason_code;
1163
1164         if (len < 24 + 2)
1165                 return;
1166
1167         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1168                 return;
1169
1170         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1171
1172         if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
1173                 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
1174                                 sdata->dev->name, reason_code);
1175
1176         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1177             (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
1178              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
1179              ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
1180                 ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1181                 mod_timer(&ifmgd->timer, jiffies +
1182                                       IEEE80211_RETRY_AUTH_INTERVAL);
1183         }
1184
1185         ieee80211_set_disassoc(sdata, true, false, 0);
1186         ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
1187         cfg80211_send_rx_deauth(sdata->dev, (u8 *) mgmt, len);
1188 }
1189
1190
1191 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1192                                        struct ieee80211_mgmt *mgmt,
1193                                        size_t len)
1194 {
1195         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1196         u16 reason_code;
1197
1198         if (len < 24 + 2)
1199                 return;
1200
1201         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
1202                 return;
1203
1204         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1205
1206         if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
1207                 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
1208                                 sdata->dev->name, reason_code);
1209
1210         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1211             ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
1212                 ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
1213                 mod_timer(&ifmgd->timer, jiffies +
1214                                       IEEE80211_RETRY_AUTH_INTERVAL);
1215         }
1216
1217         ieee80211_set_disassoc(sdata, false, false, reason_code);
1218         cfg80211_send_rx_disassoc(sdata->dev, (u8 *) mgmt, len);
1219 }
1220
1221
1222 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1223                                          struct ieee80211_mgmt *mgmt,
1224                                          size_t len,
1225                                          int reassoc)
1226 {
1227         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1228         struct ieee80211_local *local = sdata->local;
1229         struct ieee80211_supported_band *sband;
1230         struct sta_info *sta;
1231         u32 rates, basic_rates;
1232         u16 capab_info, status_code, aid;
1233         struct ieee802_11_elems elems;
1234         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1235         u8 *pos;
1236         u32 changed = 0;
1237         int i, j;
1238         bool have_higher_than_11mbit = false, newsta = false;
1239         u16 ap_ht_cap_flags;
1240
1241         /* AssocResp and ReassocResp have identical structure, so process both
1242          * of them in this function. */
1243
1244         if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1245                 return;
1246
1247         if (len < 24 + 6)
1248                 return;
1249
1250         if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
1251                 return;
1252
1253         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1254         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1255         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1256
1257         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
1258                "status=%d aid=%d)\n",
1259                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
1260                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1261
1262         pos = mgmt->u.assoc_resp.variable;
1263         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1264
1265         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
1266             elems.timeout_int && elems.timeout_int_len == 5 &&
1267             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
1268                 u32 tu, ms;
1269                 tu = get_unaligned_le32(elems.timeout_int + 1);
1270                 ms = tu * 1024 / 1000;
1271                 printk(KERN_DEBUG "%s: AP rejected association temporarily; "
1272                        "comeback duration %u TU (%u ms)\n",
1273                        sdata->dev->name, tu, ms);
1274                 if (ms > IEEE80211_ASSOC_TIMEOUT)
1275                         mod_timer(&ifmgd->timer,
1276                                   jiffies + msecs_to_jiffies(ms));
1277                 return;
1278         }
1279
1280         if (status_code != WLAN_STATUS_SUCCESS) {
1281                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1282                        sdata->dev->name, status_code);
1283                 /* if this was a reassociation, ensure we try a "full"
1284                  * association next time. This works around some broken APs
1285                  * which do not correctly reject reassociation requests. */
1286                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1287                 return;
1288         }
1289
1290         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1291                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1292                        "set\n", sdata->dev->name, aid);
1293         aid &= ~(BIT(15) | BIT(14));
1294
1295         if (!elems.supp_rates) {
1296                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1297                        sdata->dev->name);
1298                 return;
1299         }
1300
1301         printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1302         ifmgd->aid = aid;
1303         ifmgd->ap_capab = capab_info;
1304
1305         kfree(ifmgd->assocresp_ies);
1306         ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
1307         ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
1308         if (ifmgd->assocresp_ies)
1309                 memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
1310
1311         rcu_read_lock();
1312
1313         /* Add STA entry for the AP */
1314         sta = sta_info_get(local, ifmgd->bssid);
1315         if (!sta) {
1316                 newsta = true;
1317
1318                 sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
1319                 if (!sta) {
1320                         printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1321                                " the AP\n", sdata->dev->name);
1322                         rcu_read_unlock();
1323                         return;
1324                 }
1325
1326                 /* update new sta with its last rx activity */
1327                 sta->last_rx = jiffies;
1328         }
1329
1330         /*
1331          * FIXME: Do we really need to update the sta_info's information here?
1332          *        We already know about the AP (we found it in our list) so it
1333          *        should already be filled with the right info, no?
1334          *        As is stands, all this is racy because typically we assume
1335          *        the information that is filled in here (except flags) doesn't
1336          *        change while a STA structure is alive. As such, it should move
1337          *        to between the sta_info_alloc() and sta_info_insert() above.
1338          */
1339
1340         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP |
1341                            WLAN_STA_AUTHORIZED);
1342
1343         rates = 0;
1344         basic_rates = 0;
1345         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1346
1347         for (i = 0; i < elems.supp_rates_len; i++) {
1348                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1349                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1350
1351                 if (rate > 110)
1352                         have_higher_than_11mbit = true;
1353
1354                 for (j = 0; j < sband->n_bitrates; j++) {
1355                         if (sband->bitrates[j].bitrate == rate) {
1356                                 rates |= BIT(j);
1357                                 if (is_basic)
1358                                         basic_rates |= BIT(j);
1359                                 break;
1360                         }
1361                 }
1362         }
1363
1364         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1365                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1366                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1367
1368                 if (rate > 110)
1369                         have_higher_than_11mbit = true;
1370
1371                 for (j = 0; j < sband->n_bitrates; j++) {
1372                         if (sband->bitrates[j].bitrate == rate) {
1373                                 rates |= BIT(j);
1374                                 if (is_basic)
1375                                         basic_rates |= BIT(j);
1376                                 break;
1377                         }
1378                 }
1379         }
1380
1381         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1382         sdata->vif.bss_conf.basic_rates = basic_rates;
1383
1384         /* cf. IEEE 802.11 9.2.12 */
1385         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1386             have_higher_than_11mbit)
1387                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1388         else
1389                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1390
1391         /* If TKIP/WEP is used, no need to parse AP's HT capabilities */
1392         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1393                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1394                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1395
1396         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1397
1398         rate_control_rate_init(sta);
1399
1400         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1401                 set_sta_flags(sta, WLAN_STA_MFP);
1402
1403         if (elems.wmm_param)
1404                 set_sta_flags(sta, WLAN_STA_WME);
1405
1406         if (newsta) {
1407                 int err = sta_info_insert(sta);
1408                 if (err) {
1409                         printk(KERN_DEBUG "%s: failed to insert STA entry for"
1410                                " the AP (error %d)\n", sdata->dev->name, err);
1411                         rcu_read_unlock();
1412                         return;
1413                 }
1414         }
1415
1416         rcu_read_unlock();
1417
1418         if (elems.wmm_param)
1419                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1420                                          elems.wmm_param_len);
1421
1422         if (elems.ht_info_elem && elems.wmm_param &&
1423             (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
1424             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
1425                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1426                                                ap_ht_cap_flags);
1427
1428         /* set AID and assoc capability,
1429          * ieee80211_set_associated() will tell the driver */
1430         bss_conf->aid = aid;
1431         bss_conf->assoc_capability = capab_info;
1432         ieee80211_set_associated(sdata, changed);
1433
1434         /*
1435          * initialise the time of last beacon to be the association time,
1436          * otherwise beacon loss check will trigger immediately
1437          */
1438         ifmgd->last_beacon = jiffies;
1439
1440         ieee80211_associated(sdata);
1441         cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
1442 }
1443
1444
1445 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1446                                   struct ieee80211_mgmt *mgmt,
1447                                   size_t len,
1448                                   struct ieee80211_rx_status *rx_status,
1449                                   struct ieee802_11_elems *elems,
1450                                   bool beacon)
1451 {
1452         struct ieee80211_local *local = sdata->local;
1453         int freq;
1454         struct ieee80211_bss *bss;
1455         struct ieee80211_channel *channel;
1456
1457         if (elems->ds_params && elems->ds_params_len == 1)
1458                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1459         else
1460                 freq = rx_status->freq;
1461
1462         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1463
1464         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1465                 return;
1466
1467         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1468                                         channel, beacon);
1469         if (!bss)
1470                 return;
1471
1472         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1473             (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN) == 0)) {
1474                 struct ieee80211_channel_sw_ie *sw_elem =
1475                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1476                 ieee80211_process_chanswitch(sdata, sw_elem, bss);
1477         }
1478
1479         ieee80211_rx_bss_put(local, bss);
1480 }
1481
1482
1483 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1484                                          struct ieee80211_mgmt *mgmt,
1485                                          size_t len,
1486                                          struct ieee80211_rx_status *rx_status)
1487 {
1488         struct ieee80211_if_managed *ifmgd;
1489         size_t baselen;
1490         struct ieee802_11_elems elems;
1491
1492         ifmgd = &sdata->u.mgd;
1493
1494         if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
1495                 return; /* ignore ProbeResp to foreign address */
1496
1497         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1498         if (baselen > len)
1499                 return;
1500
1501         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1502                                 &elems);
1503
1504         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1505
1506         /* direct probe may be part of the association flow */
1507         if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
1508                                &ifmgd->request)) {
1509                 printk(KERN_DEBUG "%s direct probe responded\n",
1510                        sdata->dev->name);
1511                 ieee80211_authenticate(sdata);
1512         }
1513
1514         if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
1515                 ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1516 }
1517
1518 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1519                                      struct ieee80211_mgmt *mgmt,
1520                                      size_t len,
1521                                      struct ieee80211_rx_status *rx_status)
1522 {
1523         struct ieee80211_if_managed *ifmgd;
1524         size_t baselen;
1525         struct ieee802_11_elems elems;
1526         struct ieee80211_local *local = sdata->local;
1527         u32 changed = 0;
1528         bool erp_valid, directed_tim;
1529         u8 erp_value = 0;
1530
1531         /* Process beacon from the current BSS */
1532         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1533         if (baselen > len)
1534                 return;
1535
1536         ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
1537
1538         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
1539
1540         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1541                 return;
1542
1543         ifmgd = &sdata->u.mgd;
1544
1545         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
1546             memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
1547                 return;
1548
1549         if (rx_status->freq != local->hw.conf.channel->center_freq)
1550                 return;
1551
1552         ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1553                                  elems.wmm_param_len);
1554
1555         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1556                 directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
1557
1558                 if (directed_tim) {
1559                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1560                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1561                                 ieee80211_hw_config(local,
1562                                                     IEEE80211_CONF_CHANGE_PS);
1563                                 ieee80211_send_nullfunc(local, sdata, 0);
1564                         } else {
1565                                 local->pspolling = true;
1566
1567                                 /*
1568                                  * Here is assumed that the driver will be
1569                                  * able to send ps-poll frame and receive a
1570                                  * response even though power save mode is
1571                                  * enabled, but some drivers might require
1572                                  * to disable power save here. This needs
1573                                  * to be investigated.
1574                                  */
1575                                 ieee80211_send_pspoll(local, sdata);
1576                         }
1577                 }
1578         }
1579
1580         if (elems.erp_info && elems.erp_info_len >= 1) {
1581                 erp_valid = true;
1582                 erp_value = elems.erp_info[0];
1583         } else {
1584                 erp_valid = false;
1585         }
1586         changed |= ieee80211_handle_bss_capability(sdata,
1587                         le16_to_cpu(mgmt->u.beacon.capab_info),
1588                         erp_valid, erp_value);
1589
1590
1591         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1592             !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) {
1593                 struct sta_info *sta;
1594                 struct ieee80211_supported_band *sband;
1595                 u16 ap_ht_cap_flags;
1596
1597                 rcu_read_lock();
1598
1599                 sta = sta_info_get(local, ifmgd->bssid);
1600                 if (!sta) {
1601                         rcu_read_unlock();
1602                         return;
1603                 }
1604
1605                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1606
1607                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1608                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1609
1610                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1611
1612                 rcu_read_unlock();
1613
1614                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1615                                                ap_ht_cap_flags);
1616         }
1617
1618         if (elems.country_elem) {
1619                 /* Note we are only reviewing this on beacons
1620                  * for the BSSID we are associated to */
1621                 regulatory_hint_11d(local->hw.wiphy,
1622                         elems.country_elem, elems.country_elem_len);
1623
1624                 /* TODO: IBSS also needs this */
1625                 if (elems.pwr_constr_elem)
1626                         ieee80211_handle_pwr_constr(sdata,
1627                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1628                                 elems.pwr_constr_elem,
1629                                 elems.pwr_constr_elem_len);
1630         }
1631
1632         ieee80211_bss_info_change_notify(sdata, changed);
1633 }
1634
1635 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1636                                           struct sk_buff *skb,
1637                                           struct ieee80211_rx_status *rx_status)
1638 {
1639         struct ieee80211_local *local = sdata->local;
1640         struct ieee80211_mgmt *mgmt;
1641         u16 fc;
1642
1643         if (skb->len < 24)
1644                 return RX_DROP_MONITOR;
1645
1646         mgmt = (struct ieee80211_mgmt *) skb->data;
1647         fc = le16_to_cpu(mgmt->frame_control);
1648
1649         switch (fc & IEEE80211_FCTL_STYPE) {
1650         case IEEE80211_STYPE_PROBE_REQ:
1651         case IEEE80211_STYPE_PROBE_RESP:
1652         case IEEE80211_STYPE_BEACON:
1653                 memcpy(skb->cb, rx_status, sizeof(*rx_status));
1654         case IEEE80211_STYPE_AUTH:
1655         case IEEE80211_STYPE_ASSOC_RESP:
1656         case IEEE80211_STYPE_REASSOC_RESP:
1657         case IEEE80211_STYPE_DEAUTH:
1658         case IEEE80211_STYPE_DISASSOC:
1659                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1660                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
1661                 return RX_QUEUED;
1662         }
1663
1664         return RX_DROP_MONITOR;
1665 }
1666
1667 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1668                                          struct sk_buff *skb)
1669 {
1670         struct ieee80211_rx_status *rx_status;
1671         struct ieee80211_mgmt *mgmt;
1672         u16 fc;
1673
1674         rx_status = (struct ieee80211_rx_status *) skb->cb;
1675         mgmt = (struct ieee80211_mgmt *) skb->data;
1676         fc = le16_to_cpu(mgmt->frame_control);
1677
1678         switch (fc & IEEE80211_FCTL_STYPE) {
1679         case IEEE80211_STYPE_PROBE_RESP:
1680                 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
1681                                              rx_status);
1682                 break;
1683         case IEEE80211_STYPE_BEACON:
1684                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1685                                          rx_status);
1686                 break;
1687         case IEEE80211_STYPE_AUTH:
1688                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
1689                 break;
1690         case IEEE80211_STYPE_ASSOC_RESP:
1691                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
1692                 break;
1693         case IEEE80211_STYPE_REASSOC_RESP:
1694                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
1695                 break;
1696         case IEEE80211_STYPE_DEAUTH:
1697                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1698                 break;
1699         case IEEE80211_STYPE_DISASSOC:
1700                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1701                 break;
1702         }
1703
1704         kfree_skb(skb);
1705 }
1706
1707 static void ieee80211_sta_timer(unsigned long data)
1708 {
1709         struct ieee80211_sub_if_data *sdata =
1710                 (struct ieee80211_sub_if_data *) data;
1711         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1712         struct ieee80211_local *local = sdata->local;
1713
1714         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1715         queue_work(local->hw.workqueue, &ifmgd->work);
1716 }
1717
1718 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
1719 {
1720         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1721         struct ieee80211_local *local = sdata->local;
1722
1723         if (local->ops->reset_tsf) {
1724                 /* Reset own TSF to allow time synchronization work. */
1725                 local->ops->reset_tsf(local_to_hw(local));
1726         }
1727
1728         ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
1729
1730
1731         if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
1732                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1733         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
1734                 ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
1735         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
1736                 ifmgd->auth_alg = WLAN_AUTH_LEAP;
1737         else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
1738                 ifmgd->auth_alg = WLAN_AUTH_FT;
1739         else
1740                 ifmgd->auth_alg = WLAN_AUTH_OPEN;
1741         ifmgd->auth_transaction = -1;
1742         ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
1743         ifmgd->assoc_scan_tries = 0;
1744         ifmgd->direct_probe_tries = 0;
1745         ifmgd->auth_tries = 0;
1746         ifmgd->assoc_tries = 0;
1747         netif_tx_stop_all_queues(sdata->dev);
1748         netif_carrier_off(sdata->dev);
1749 }
1750
1751 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
1752 {
1753         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1754         struct ieee80211_local *local = sdata->local;
1755         struct ieee80211_bss *bss;
1756         u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
1757         u8 ssid_len = ifmgd->ssid_len;
1758         u16 capa_mask = WLAN_CAPABILITY_ESS;
1759         u16 capa_val = WLAN_CAPABILITY_ESS;
1760         struct ieee80211_channel *chan = local->oper_channel;
1761
1762         if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
1763             ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
1764                             IEEE80211_STA_AUTO_BSSID_SEL |
1765                             IEEE80211_STA_AUTO_CHANNEL_SEL)) {
1766                 capa_mask |= WLAN_CAPABILITY_PRIVACY;
1767                 if (sdata->default_key)
1768                         capa_val |= WLAN_CAPABILITY_PRIVACY;
1769         }
1770
1771         if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
1772                 chan = NULL;
1773
1774         if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
1775                 bssid = NULL;
1776
1777         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
1778                 ssid = NULL;
1779                 ssid_len = 0;
1780         }
1781
1782         bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
1783                                        bssid, ssid, ssid_len,
1784                                        capa_mask, capa_val);
1785
1786         if (bss) {
1787                 ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
1788                 if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
1789                         ieee80211_sta_set_ssid(sdata, bss->ssid,
1790                                                bss->ssid_len);
1791                 ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
1792                 ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
1793                                                     bss->supp_rates);
1794                 if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
1795                         sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
1796                 else
1797                         sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
1798
1799                 /* Send out direct probe if no probe resp was received or
1800                  * the one we have is outdated
1801                  */
1802                 if (!bss->last_probe_resp ||
1803                     time_after(jiffies, bss->last_probe_resp
1804                                         + IEEE80211_SCAN_RESULT_EXPIRE))
1805                         ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1806                 else
1807                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1808
1809                 ieee80211_rx_bss_put(local, bss);
1810                 ieee80211_sta_reset_auth(sdata);
1811                 return 0;
1812         } else {
1813                 if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
1814                         ifmgd->assoc_scan_tries++;
1815                         /* XXX maybe racy? */
1816                         if (local->scan_req)
1817                                 return -1;
1818                         memcpy(local->int_scan_req.ssids[0].ssid,
1819                                ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
1820                         if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
1821                                 local->int_scan_req.ssids[0].ssid_len = 0;
1822                         else
1823                                 local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
1824
1825                         if (ieee80211_start_scan(sdata, &local->int_scan_req))
1826                                 ieee80211_scan_failed(local);
1827
1828                         ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
1829                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1830                 } else {
1831                         ifmgd->assoc_scan_tries = 0;
1832                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
1833                 }
1834         }
1835         return -1;
1836 }
1837
1838
1839 static void ieee80211_sta_work(struct work_struct *work)
1840 {
1841         struct ieee80211_sub_if_data *sdata =
1842                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1843         struct ieee80211_local *local = sdata->local;
1844         struct ieee80211_if_managed *ifmgd;
1845         struct sk_buff *skb;
1846
1847         if (!netif_running(sdata->dev))
1848                 return;
1849
1850         if (local->sw_scanning || local->hw_scanning)
1851                 return;
1852
1853         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1854                 return;
1855         ifmgd = &sdata->u.mgd;
1856
1857         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1858                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1859
1860         if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
1861             ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1862             ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
1863             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
1864                 /*
1865                  * The call to ieee80211_start_scan can fail but ieee80211_request_scan
1866                  * (which queued ieee80211_sta_work) did not return an error. Thus, call
1867                  * ieee80211_scan_failed here if ieee80211_start_scan fails in order to
1868                  * notify the scan requester.
1869                  */
1870                 if (ieee80211_start_scan(sdata, local->scan_req))
1871                         ieee80211_scan_failed(local);
1872                 return;
1873         }
1874
1875         if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
1876                 if (ieee80211_sta_config_auth(sdata))
1877                         return;
1878                 clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1879         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
1880                 return;
1881
1882         switch (ifmgd->state) {
1883         case IEEE80211_STA_MLME_DISABLED:
1884                 break;
1885         case IEEE80211_STA_MLME_DIRECT_PROBE:
1886                 ieee80211_direct_probe(sdata);
1887                 break;
1888         case IEEE80211_STA_MLME_AUTHENTICATE:
1889                 ieee80211_authenticate(sdata);
1890                 break;
1891         case IEEE80211_STA_MLME_ASSOCIATE:
1892                 ieee80211_associate(sdata);
1893                 break;
1894         case IEEE80211_STA_MLME_ASSOCIATED:
1895                 ieee80211_associated(sdata);
1896                 break;
1897         default:
1898                 WARN_ON(1);
1899                 break;
1900         }
1901
1902         if (ieee80211_privacy_mismatch(sdata)) {
1903                 printk(KERN_DEBUG "%s: privacy configuration mismatch and "
1904                        "mixed-cell disabled - disassociate\n", sdata->dev->name);
1905
1906                 ieee80211_set_disassoc(sdata, false, true,
1907                                         WLAN_REASON_UNSPECIFIED);
1908         }
1909 }
1910
1911 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1912 {
1913         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1914                 queue_work(sdata->local->hw.workqueue,
1915                            &sdata->u.mgd.work);
1916 }
1917
1918 /* interface setup */
1919 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1920 {
1921         struct ieee80211_if_managed *ifmgd;
1922
1923         ifmgd = &sdata->u.mgd;
1924         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1925         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1926         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1927         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1928                     (unsigned long) sdata);
1929         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1930                     (unsigned long) sdata);
1931         skb_queue_head_init(&ifmgd->skb_queue);
1932
1933         ifmgd->capab = WLAN_CAPABILITY_ESS;
1934         ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
1935                 IEEE80211_AUTH_ALG_SHARED_KEY;
1936         ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
1937                 IEEE80211_STA_AUTO_BSSID_SEL |
1938                 IEEE80211_STA_AUTO_CHANNEL_SEL;
1939         if (sdata->local->hw.queues >= 4)
1940                 ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
1941 }
1942
1943 /* configuration hooks */
1944 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
1945 {
1946         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1947         struct ieee80211_local *local = sdata->local;
1948
1949         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1950                 return;
1951
1952         if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
1953                              IEEE80211_STA_AUTO_BSSID_SEL)) &&
1954             (ifmgd->flags & (IEEE80211_STA_SSID_SET |
1955                              IEEE80211_STA_AUTO_SSID_SEL))) {
1956
1957                 if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
1958                         ieee80211_set_disassoc(sdata, true, true,
1959                                                WLAN_REASON_DEAUTH_LEAVING);
1960
1961                 if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
1962                     ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
1963                         set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
1964                 else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
1965                         set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
1966                 queue_work(local->hw.workqueue, &ifmgd->work);
1967         }
1968 }
1969
1970 int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
1971 {
1972         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1973
1974         if (ifmgd->ssid_len)
1975                 ifmgd->flags |= IEEE80211_STA_SSID_SET;
1976         else
1977                 ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
1978
1979         return 0;
1980 }
1981
1982 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
1983 {
1984         struct ieee80211_if_managed *ifmgd;
1985
1986         if (len > IEEE80211_MAX_SSID_LEN)
1987                 return -EINVAL;
1988
1989         ifmgd = &sdata->u.mgd;
1990
1991         if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
1992                 /*
1993                  * Do not use reassociation if SSID is changed (different ESS).
1994                  */
1995                 ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1996                 memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
1997                 memcpy(ifmgd->ssid, ssid, len);
1998                 ifmgd->ssid_len = len;
1999         }
2000
2001         return ieee80211_sta_commit(sdata);
2002 }
2003
2004 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
2005 {
2006         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2007         memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
2008         *len = ifmgd->ssid_len;
2009         return 0;
2010 }
2011
2012 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
2013 {
2014         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2015
2016         if (is_valid_ether_addr(bssid)) {
2017                 memcpy(ifmgd->bssid, bssid, ETH_ALEN);
2018                 ifmgd->flags |= IEEE80211_STA_BSSID_SET;
2019         } else {
2020                 memset(ifmgd->bssid, 0, ETH_ALEN);
2021                 ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
2022         }
2023
2024         if (netif_running(sdata->dev)) {
2025                 if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
2026                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
2027                                "the low-level driver\n", sdata->dev->name);
2028                 }
2029         }
2030
2031         return ieee80211_sta_commit(sdata);
2032 }
2033
2034 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
2035                                const char *ie, size_t len)
2036 {
2037         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2038
2039         kfree(ifmgd->extra_ie);
2040         if (len == 0) {
2041                 ifmgd->extra_ie = NULL;
2042                 ifmgd->extra_ie_len = 0;
2043                 return 0;
2044         }
2045         ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
2046         if (!ifmgd->extra_ie) {
2047                 ifmgd->extra_ie_len = 0;
2048                 return -ENOMEM;
2049         }
2050         memcpy(ifmgd->extra_ie, ie, len);
2051         ifmgd->extra_ie_len = len;
2052         return 0;
2053 }
2054
2055 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
2056 {
2057         printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
2058                sdata->dev->name, reason);
2059
2060         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2061                 return -EINVAL;
2062
2063         ieee80211_set_disassoc(sdata, true, true, reason);
2064         return 0;
2065 }
2066
2067 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
2068 {
2069         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2070
2071         printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
2072                sdata->dev->name, reason);
2073
2074         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2075                 return -EINVAL;
2076
2077         if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
2078                 return -ENOLINK;
2079
2080         ieee80211_set_disassoc(sdata, false, true, reason);
2081         return 0;
2082 }
2083
2084 /* scan finished notification */
2085 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2086 {
2087         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2088
2089         /* Restart STA timers */
2090         rcu_read_lock();
2091         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2092                 ieee80211_restart_sta_timer(sdata);
2093         rcu_read_unlock();
2094 }
2095
2096 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
2097 {
2098         struct ieee80211_local *local =
2099                 container_of(work, struct ieee80211_local,
2100                              dynamic_ps_disable_work);
2101
2102         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2103                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2104                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2105         }
2106
2107         ieee80211_wake_queues_by_reason(&local->hw,
2108                                         IEEE80211_QUEUE_STOP_REASON_PS);
2109 }
2110
2111 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
2112 {
2113         struct ieee80211_local *local =
2114                 container_of(work, struct ieee80211_local,
2115                              dynamic_ps_enable_work);
2116         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2117
2118         if (local->hw.conf.flags & IEEE80211_CONF_PS)
2119                 return;
2120
2121         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2122                 ieee80211_send_nullfunc(local, sdata, 1);
2123
2124         local->hw.conf.flags |= IEEE80211_CONF_PS;
2125         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2126 }
2127
2128 void ieee80211_dynamic_ps_timer(unsigned long data)
2129 {
2130         struct ieee80211_local *local = (void *) data;
2131
2132         queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
2133 }
2134
2135 void ieee80211_send_nullfunc(struct ieee80211_local *local,
2136                              struct ieee80211_sub_if_data *sdata,
2137                              int powersave)
2138 {
2139         struct sk_buff *skb;
2140         struct ieee80211_hdr *nullfunc;
2141         __le16 fc;
2142
2143         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2144                 return;
2145
2146         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
2147         if (!skb) {
2148                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2149                        "frame\n", sdata->dev->name);
2150                 return;
2151         }
2152         skb_reserve(skb, local->hw.extra_tx_headroom);
2153
2154         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
2155         memset(nullfunc, 0, 24);
2156         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
2157                          IEEE80211_FCTL_TODS);
2158         if (powersave)
2159                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
2160         nullfunc->frame_control = fc;
2161         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2162         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
2163         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2164
2165         ieee80211_tx_skb(sdata, skb, 0);
2166 }