net/wireless/wext-sme.c

   1 /*
   2  * cfg80211 wext compat for managed mode.
   3  *
   4  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright (C) 2009   Intel Corporation. All rights reserved.
   6  */
   7
   8 #include <linux/export.h>
   9 #include <linux/etherdevice.h>
  10 #include <linux/if_arp.h>
  11 #include <linux/slab.h>
  12 #include <net/cfg80211.h>
  13 #include <net/cfg80211-wext.h>
  14 #include "wext-compat.h"
  15 #include "nl80211.h"
  16
  17 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
  18                               struct wireless_dev *wdev)
  19 {
  20         struct cfg80211_cached_keys *ck = NULL;
  21         const u8 *prev_bssid = NULL;
  22         int err, i;
  23
  24         ASSERT_RDEV_LOCK(rdev);
  25         ASSERT_WDEV_LOCK(wdev);
  26
  27         if (!netif_running(wdev->netdev))
  28                 return 0;
  29
  30         wdev->wext.connect.ie = wdev->wext.ie;
  31         wdev->wext.connect.ie_len = wdev->wext.ie_len;
  32
  33         /* Use default background scan period */
  34         wdev->wext.connect.bg_scan_period = -1;
  35
  36         if (wdev->wext.keys) {
  37                 wdev->wext.keys->def = wdev->wext.default_key;
  38                 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
  39                 if (wdev->wext.default_key != -1)
  40                         wdev->wext.connect.privacy = true;
  41         }
  42
  43         if (!wdev->wext.connect.ssid_len)
  44                 return 0;
  45
  46         if (wdev->wext.keys) {
  47                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
  48                 if (!ck)
  49                         return -ENOMEM;
  50                 for (i = 0; i < 6; i++)
  51                         ck->params[i].key = ck->data[i];
  52         }
  53
  54         if (wdev->wext.prev_bssid_valid)
  55                 prev_bssid = wdev->wext.prev_bssid;
  56
  57         err = __cfg80211_connect(rdev, wdev->netdev,
  58                                  &wdev->wext.connect, ck, prev_bssid);
  59         if (err)
  60                 kfree(ck);
  61
  62         return err;
  63 }
  64
  65 int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
  66                               struct iw_request_info *info,
  67                               struct iw_freq *wextfreq, char *extra)
  68 {
  69         struct wireless_dev *wdev = dev->ieee80211_ptr;
  70         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  71         struct ieee80211_channel *chan = NULL;
  72         int err, freq;
  73
  74         /* call only for station! */
  75         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
  76                 return -EINVAL;
  77
  78         freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
  79         if (freq < 0)
  80                 return freq;
  81
  82         if (freq) {
  83                 chan = ieee80211_get_channel(wdev->wiphy, freq);
  84                 if (!chan)
  85                         return -EINVAL;
  86                 if (chan->flags & IEEE80211_CHAN_DISABLED)
  87                         return -EINVAL;
  88         }
  89
  90         cfg80211_lock_rdev(rdev);
  91         mutex_lock(&rdev->devlist_mtx);
  92         mutex_lock(&rdev->sched_scan_mtx);
  93         wdev_lock(wdev);
  94
  95         if (wdev->sme_state != CFG80211_SME_IDLE) {
  96                 bool event = true;
  97
  98                 if (wdev->wext.connect.channel == chan) {
  99                         err = 0;
 100                         goto out;
 101                 }
 102
 103                 /* if SSID set, we'll try right again, avoid event */
 104                 if (wdev->wext.connect.ssid_len)
 105                         event = false;
 106                 err = __cfg80211_disconnect(rdev, dev,
 107                                             WLAN_REASON_DEAUTH_LEAVING, event);
 108                 if (err)
 109                         goto out;
 110         }
 111
 112
 113         wdev->wext.connect.channel = chan;
 114
 115         /*
 116          * SSID is not set, we just want to switch monitor channel,
 117          * this is really just backward compatibility, if the SSID
 118          * is set then we use the channel to select the BSS to use
 119          * to connect to instead. If we were connected on another
 120          * channel we disconnected above and reconnect below.
 121          */
 122         if (chan && !wdev->wext.connect.ssid_len) {
 123                 struct cfg80211_chan_def chandef = {
 124                         .width = NL80211_CHAN_WIDTH_20_NOHT,
 125                         .center_freq1 = freq,
 126                 };
 127
 128                 chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
 129                 if (chandef.chan)
 130                         err = cfg80211_set_monitor_channel(rdev, &chandef);
 131                 else
 132                         err = -EINVAL;
 133                 goto out;
 134         }
 135
 136         err = cfg80211_mgd_wext_connect(rdev, wdev);
 137  out:
 138         wdev_unlock(wdev);
 139         mutex_unlock(&rdev->sched_scan_mtx);
 140         mutex_unlock(&rdev->devlist_mtx);
 141         cfg80211_unlock_rdev(rdev);
 142         return err;
 143 }
 144
 145 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 146                               struct iw_request_info *info,
 147                               struct iw_freq *freq, char *extra)
 148 {
 149         struct wireless_dev *wdev = dev->ieee80211_ptr;
 150         struct ieee80211_channel *chan = NULL;
 151
 152         /* call only for station! */
 153         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 154                 return -EINVAL;
 155
 156         wdev_lock(wdev);
 157         if (wdev->current_bss)
 158                 chan = wdev->current_bss->pub.channel;
 159         else if (wdev->wext.connect.channel)
 160                 chan = wdev->wext.connect.channel;
 161         wdev_unlock(wdev);
 162
 163         if (chan) {
 164                 freq->m = chan->center_freq;
 165                 freq->e = 6;
 166                 return 0;
 167         }
 168
 169         /* no channel if not joining */
 170         return -EINVAL;
 171 }
 172
 173 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 174                                struct iw_request_info *info,
 175                                struct iw_point *data, char *ssid)
 176 {
 177         struct wireless_dev *wdev = dev->ieee80211_ptr;
 178         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 179         size_t len = data->length;
 180         int err;
 181
 182         /* call only for station! */
 183         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 184                 return -EINVAL;
 185
 186         if (!data->flags)
 187                 len = 0;
 188
 189         /* iwconfig uses nul termination in SSID.. */
 190         if (len > 0 && ssid[len - 1] == '\0')
 191                 len--;
 192
 193         cfg80211_lock_rdev(rdev);
 194         mutex_lock(&rdev->devlist_mtx);
 195         mutex_lock(&rdev->sched_scan_mtx);
 196         wdev_lock(wdev);
 197
 198         err = 0;
 199
 200         if (wdev->sme_state != CFG80211_SME_IDLE) {
 201                 bool event = true;
 202
 203                 if (wdev->wext.connect.ssid && len &&
 204                     len == wdev->wext.connect.ssid_len &&
 205                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 206                         goto out;
 207
 208                 /* if SSID set now, we'll try to connect, avoid event */
 209                 if (len)
 210                         event = false;
 211                 err = __cfg80211_disconnect(rdev, dev,
 212                                             WLAN_REASON_DEAUTH_LEAVING, event);
 213                 if (err)
 214                         goto out;
 215         }
 216
 217         wdev->wext.prev_bssid_valid = false;
 218         wdev->wext.connect.ssid = wdev->wext.ssid;
 219         memcpy(wdev->wext.ssid, ssid, len);
 220         wdev->wext.connect.ssid_len = len;
 221
 222         wdev->wext.connect.crypto.control_port = false;
 223         wdev->wext.connect.crypto.control_port_ethertype =
 224                                         cpu_to_be16(ETH_P_PAE);
 225
 226         err = cfg80211_mgd_wext_connect(rdev, wdev);
 227  out:
 228         wdev_unlock(wdev);
 229         mutex_unlock(&rdev->sched_scan_mtx);
 230         mutex_unlock(&rdev->devlist_mtx);
 231         cfg80211_unlock_rdev(rdev);
 232         return err;
 233 }
 234
 235 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 236                                struct iw_request_info *info,
 237                                struct iw_point *data, char *ssid)
 238 {
 239         struct wireless_dev *wdev = dev->ieee80211_ptr;
 240
 241         /* call only for station! */
 242         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 243                 return -EINVAL;
 244
 245         data->flags = 0;
 246
 247         wdev_lock(wdev);
 248         if (wdev->current_bss) {
 249                 const u8 *ie;
 250
 251                 rcu_read_lock();
 252                 ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
 253                                           WLAN_EID_SSID);
 254                 if (ie) {
 255                         data->flags = 1;
 256                         data->length = ie[1];
 257                         memcpy(ssid, ie + 2, data->length);
 258                 }
 259                 rcu_read_unlock();
 260         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 261                 data->flags = 1;
 262                 data->length = wdev->wext.connect.ssid_len;
 263                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 264         }
 265         wdev_unlock(wdev);
 266
 267         return 0;
 268 }
 269
 270 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 271                             struct iw_request_info *info,
 272                             struct sockaddr *ap_addr, char *extra)
 273 {
 274         struct wireless_dev *wdev = dev->ieee80211_ptr;
 275         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 276         u8 *bssid = ap_addr->sa_data;
 277         int err;
 278
 279         /* call only for station! */
 280         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 281                 return -EINVAL;
 282
 283         if (ap_addr->sa_family != ARPHRD_ETHER)
 284                 return -EINVAL;
 285
 286         /* automatic mode */
 287         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 288                 bssid = NULL;
 289
 290         cfg80211_lock_rdev(rdev);
 291         mutex_lock(&rdev->devlist_mtx);
 292         mutex_lock(&rdev->sched_scan_mtx);
 293         wdev_lock(wdev);
 294
 295         if (wdev->sme_state != CFG80211_SME_IDLE) {
 296                 err = 0;
 297                 /* both automatic */
 298                 if (!bssid && !wdev->wext.connect.bssid)
 299                         goto out;
 300
 301                 /* fixed already - and no change */
 302                 if (wdev->wext.connect.bssid && bssid &&
 303                     ether_addr_equal(bssid, wdev->wext.connect.bssid))
 304                         goto out;
 305
 306                 err = __cfg80211_disconnect(rdev, dev,
 307                                             WLAN_REASON_DEAUTH_LEAVING, false);
 308                 if (err)
 309                         goto out;
 310         }
 311
 312         if (bssid) {
 313                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 314                 wdev->wext.connect.bssid = wdev->wext.bssid;
 315         } else
 316                 wdev->wext.connect.bssid = NULL;
 317
 318         err = cfg80211_mgd_wext_connect(rdev, wdev);
 319  out:
 320         wdev_unlock(wdev);
 321         mutex_unlock(&rdev->sched_scan_mtx);
 322         mutex_unlock(&rdev->devlist_mtx);
 323         cfg80211_unlock_rdev(rdev);
 324         return err;
 325 }
 326
 327 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 328                             struct iw_request_info *info,
 329                             struct sockaddr *ap_addr, char *extra)
 330 {
 331         struct wireless_dev *wdev = dev->ieee80211_ptr;
 332
 333         /* call only for station! */
 334         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 335                 return -EINVAL;
 336
 337         ap_addr->sa_family = ARPHRD_ETHER;
 338
 339         wdev_lock(wdev);
 340         if (wdev->current_bss)
 341                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 342         else
 343                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 344         wdev_unlock(wdev);
 345
 346         return 0;
 347 }
 348
 349 int cfg80211_wext_siwgenie(struct net_device *dev,
 350                            struct iw_request_info *info,
 351                            struct iw_point *data, char *extra)
 352 {
 353         struct wireless_dev *wdev = dev->ieee80211_ptr;
 354         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 355         u8 *ie = extra;
 356         int ie_len = data->length, err;
 357
 358         if (wdev->iftype != NL80211_IFTYPE_STATION)
 359                 return -EOPNOTSUPP;
 360
 361         if (!ie_len)
 362                 ie = NULL;
 363
 364         wdev_lock(wdev);
 365
 366         /* no change */
 367         err = 0;
 368         if (wdev->wext.ie_len == ie_len &&
 369             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 370                 goto out;
 371
 372         if (ie_len) {
 373                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 374                 if (!ie) {
 375                         err = -ENOMEM;
 376                         goto out;
 377                 }
 378         } else
 379                 ie = NULL;
 380
 381         kfree(wdev->wext.ie);
 382         wdev->wext.ie = ie;
 383         wdev->wext.ie_len = ie_len;
 384
 385         if (wdev->sme_state != CFG80211_SME_IDLE) {
 386                 err = __cfg80211_disconnect(rdev, dev,
 387                                             WLAN_REASON_DEAUTH_LEAVING, false);
 388                 if (err)
 389                         goto out;
 390         }
 391
 392         /* userspace better not think we'll reconnect */
 393         err = 0;
 394  out:
 395         wdev_unlock(wdev);
 396         return err;
 397 }
 398
 399 int cfg80211_wext_siwmlme(struct net_device *dev,
 400                           struct iw_request_info *info,
 401                           struct iw_point *data, char *extra)
 402 {
 403         struct wireless_dev *wdev = dev->ieee80211_ptr;
 404         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 405         struct cfg80211_registered_device *rdev;
 406         int err;
 407
 408         if (!wdev)
 409                 return -EOPNOTSUPP;
 410
 411         rdev = wiphy_to_dev(wdev->wiphy);
 412
 413         if (wdev->iftype != NL80211_IFTYPE_STATION)
 414                 return -EINVAL;
 415
 416         if (mlme->addr.sa_family != ARPHRD_ETHER)
 417                 return -EINVAL;
 418
 419         wdev_lock(wdev);
 420         switch (mlme->cmd) {
 421         case IW_MLME_DEAUTH:
 422         case IW_MLME_DISASSOC:
 423                 err = __cfg80211_disconnect(rdev, dev, mlme->reason_code,
 424                                             true);
 425                 break;
 426         default:
 427                 err = -EOPNOTSUPP;
 428                 break;
 429         }
 430         wdev_unlock(wdev);
 431
 432         return err;
 433 }