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         wdev_lock(wdev);
  93
  94         if (wdev->sme_state != CFG80211_SME_IDLE) {
  95                 bool event = true;
  96
  97                 if (wdev->wext.connect.channel == chan) {
  98                         err = 0;
  99                         goto out;
 100                 }
 101
 102                 /* if SSID set, we'll try right again, avoid event */
 103                 if (wdev->wext.connect.ssid_len)
 104                         event = false;
 105                 err = __cfg80211_disconnect(rdev, dev,
 106                                             WLAN_REASON_DEAUTH_LEAVING, event);
 107                 if (err)
 108                         goto out;
 109         }
 110
 111
 112         wdev->wext.connect.channel = chan;
 113
 114         /*
 115          * SSID is not set, we just want to switch monitor channel,
 116          * this is really just backward compatibility, if the SSID
 117          * is set then we use the channel to select the BSS to use
 118          * to connect to instead. If we were connected on another
 119          * channel we disconnected above and reconnect below.
 120          */
 121         if (chan && !wdev->wext.connect.ssid_len) {
 122                 struct cfg80211_chan_def chandef = {
 123                         .width = NL80211_CHAN_WIDTH_20_NOHT,
 124                         .center_freq1 = freq,
 125                 };
 126
 127                 chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
 128                 if (chandef.chan)
 129                         err = cfg80211_set_monitor_channel(rdev, &chandef);
 130                 else
 131                         err = -EINVAL;
 132                 goto out;
 133         }
 134
 135         err = cfg80211_mgd_wext_connect(rdev, wdev);
 136  out:
 137         wdev_unlock(wdev);
 138         mutex_unlock(&rdev->devlist_mtx);
 139         cfg80211_unlock_rdev(rdev);
 140         return err;
 141 }
 142
 143 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 144                               struct iw_request_info *info,
 145                               struct iw_freq *freq, char *extra)
 146 {
 147         struct wireless_dev *wdev = dev->ieee80211_ptr;
 148         struct ieee80211_channel *chan = NULL;
 149
 150         /* call only for station! */
 151         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 152                 return -EINVAL;
 153
 154         wdev_lock(wdev);
 155         if (wdev->current_bss)
 156                 chan = wdev->current_bss->pub.channel;
 157         else if (wdev->wext.connect.channel)
 158                 chan = wdev->wext.connect.channel;
 159         wdev_unlock(wdev);
 160
 161         if (chan) {
 162                 freq->m = chan->center_freq;
 163                 freq->e = 6;
 164                 return 0;
 165         }
 166
 167         /* no channel if not joining */
 168         return -EINVAL;
 169 }
 170
 171 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 172                                struct iw_request_info *info,
 173                                struct iw_point *data, char *ssid)
 174 {
 175         struct wireless_dev *wdev = dev->ieee80211_ptr;
 176         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 177         size_t len = data->length;
 178         int err;
 179
 180         /* call only for station! */
 181         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 182                 return -EINVAL;
 183
 184         if (!data->flags)
 185                 len = 0;
 186
 187         /* iwconfig uses nul termination in SSID.. */
 188         if (len > 0 && ssid[len - 1] == '\0')
 189                 len--;
 190
 191         cfg80211_lock_rdev(rdev);
 192         mutex_lock(&rdev->devlist_mtx);
 193         wdev_lock(wdev);
 194
 195         err = 0;
 196
 197         if (wdev->sme_state != CFG80211_SME_IDLE) {
 198                 bool event = true;
 199
 200                 if (wdev->wext.connect.ssid && len &&
 201                     len == wdev->wext.connect.ssid_len &&
 202                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 203                         goto out;
 204
 205                 /* if SSID set now, we'll try to connect, avoid event */
 206                 if (len)
 207                         event = false;
 208                 err = __cfg80211_disconnect(rdev, dev,
 209                                             WLAN_REASON_DEAUTH_LEAVING, event);
 210                 if (err)
 211                         goto out;
 212         }
 213
 214         wdev->wext.prev_bssid_valid = false;
 215         wdev->wext.connect.ssid = wdev->wext.ssid;
 216         memcpy(wdev->wext.ssid, ssid, len);
 217         wdev->wext.connect.ssid_len = len;
 218
 219         wdev->wext.connect.crypto.control_port = false;
 220         wdev->wext.connect.crypto.control_port_ethertype =
 221                                         cpu_to_be16(ETH_P_PAE);
 222
 223         err = cfg80211_mgd_wext_connect(rdev, wdev);
 224  out:
 225         wdev_unlock(wdev);
 226         mutex_unlock(&rdev->devlist_mtx);
 227         cfg80211_unlock_rdev(rdev);
 228         return err;
 229 }
 230
 231 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 232                                struct iw_request_info *info,
 233                                struct iw_point *data, char *ssid)
 234 {
 235         struct wireless_dev *wdev = dev->ieee80211_ptr;
 236
 237         /* call only for station! */
 238         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 239                 return -EINVAL;
 240
 241         data->flags = 0;
 242
 243         wdev_lock(wdev);
 244         if (wdev->current_bss) {
 245                 const u8 *ie;
 246
 247                 rcu_read_lock();
 248                 ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
 249                                           WLAN_EID_SSID);
 250                 if (ie) {
 251                         data->flags = 1;
 252                         data->length = ie[1];
 253                         memcpy(ssid, ie + 2, data->length);
 254                 }
 255                 rcu_read_unlock();
 256         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 257                 data->flags = 1;
 258                 data->length = wdev->wext.connect.ssid_len;
 259                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 260         }
 261         wdev_unlock(wdev);
 262
 263         return 0;
 264 }
 265
 266 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 267                             struct iw_request_info *info,
 268                             struct sockaddr *ap_addr, char *extra)
 269 {
 270         struct wireless_dev *wdev = dev->ieee80211_ptr;
 271         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 272         u8 *bssid = ap_addr->sa_data;
 273         int err;
 274
 275         /* call only for station! */
 276         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 277                 return -EINVAL;
 278
 279         if (ap_addr->sa_family != ARPHRD_ETHER)
 280                 return -EINVAL;
 281
 282         /* automatic mode */
 283         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 284                 bssid = NULL;
 285
 286         cfg80211_lock_rdev(rdev);
 287         mutex_lock(&rdev->devlist_mtx);
 288         wdev_lock(wdev);
 289
 290         if (wdev->sme_state != CFG80211_SME_IDLE) {
 291                 err = 0;
 292                 /* both automatic */
 293                 if (!bssid && !wdev->wext.connect.bssid)
 294                         goto out;
 295
 296                 /* fixed already - and no change */
 297                 if (wdev->wext.connect.bssid && bssid &&
 298                     ether_addr_equal(bssid, wdev->wext.connect.bssid))
 299                         goto out;
 300
 301                 err = __cfg80211_disconnect(rdev, dev,
 302                                             WLAN_REASON_DEAUTH_LEAVING, false);
 303                 if (err)
 304                         goto out;
 305         }
 306
 307         if (bssid) {
 308                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 309                 wdev->wext.connect.bssid = wdev->wext.bssid;
 310         } else
 311                 wdev->wext.connect.bssid = NULL;
 312
 313         err = cfg80211_mgd_wext_connect(rdev, wdev);
 314  out:
 315         wdev_unlock(wdev);
 316         mutex_unlock(&rdev->devlist_mtx);
 317         cfg80211_unlock_rdev(rdev);
 318         return err;
 319 }
 320
 321 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 322                             struct iw_request_info *info,
 323                             struct sockaddr *ap_addr, char *extra)
 324 {
 325         struct wireless_dev *wdev = dev->ieee80211_ptr;
 326
 327         /* call only for station! */
 328         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 329                 return -EINVAL;
 330
 331         ap_addr->sa_family = ARPHRD_ETHER;
 332
 333         wdev_lock(wdev);
 334         if (wdev->current_bss)
 335                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 336         else
 337                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 338         wdev_unlock(wdev);
 339
 340         return 0;
 341 }
 342
 343 int cfg80211_wext_siwgenie(struct net_device *dev,
 344                            struct iw_request_info *info,
 345                            struct iw_point *data, char *extra)
 346 {
 347         struct wireless_dev *wdev = dev->ieee80211_ptr;
 348         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 349         u8 *ie = extra;
 350         int ie_len = data->length, err;
 351
 352         if (wdev->iftype != NL80211_IFTYPE_STATION)
 353                 return -EOPNOTSUPP;
 354
 355         if (!ie_len)
 356                 ie = NULL;
 357
 358         wdev_lock(wdev);
 359
 360         /* no change */
 361         err = 0;
 362         if (wdev->wext.ie_len == ie_len &&
 363             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 364                 goto out;
 365
 366         if (ie_len) {
 367                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 368                 if (!ie) {
 369                         err = -ENOMEM;
 370                         goto out;
 371                 }
 372         } else
 373                 ie = NULL;
 374
 375         kfree(wdev->wext.ie);
 376         wdev->wext.ie = ie;
 377         wdev->wext.ie_len = ie_len;
 378
 379         if (wdev->sme_state != CFG80211_SME_IDLE) {
 380                 err = __cfg80211_disconnect(rdev, dev,
 381                                             WLAN_REASON_DEAUTH_LEAVING, false);
 382                 if (err)
 383                         goto out;
 384         }
 385
 386         /* userspace better not think we'll reconnect */
 387         err = 0;
 388  out:
 389         wdev_unlock(wdev);
 390         return err;
 391 }
 392
 393 int cfg80211_wext_siwmlme(struct net_device *dev,
 394                           struct iw_request_info *info,
 395                           struct iw_point *data, char *extra)
 396 {
 397         struct wireless_dev *wdev = dev->ieee80211_ptr;
 398         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 399         struct cfg80211_registered_device *rdev;
 400         int err;
 401
 402         if (!wdev)
 403                 return -EOPNOTSUPP;
 404
 405         rdev = wiphy_to_dev(wdev->wiphy);
 406
 407         if (wdev->iftype != NL80211_IFTYPE_STATION)
 408                 return -EINVAL;
 409
 410         if (mlme->addr.sa_family != ARPHRD_ETHER)
 411                 return -EINVAL;
 412
 413         wdev_lock(wdev);
 414         switch (mlme->cmd) {
 415         case IW_MLME_DEAUTH:
 416         case IW_MLME_DISASSOC:
 417                 err = __cfg80211_disconnect(rdev, dev, mlme->reason_code,
 418                                             true);
 419                 break;
 420         default:
 421                 err = -EOPNOTSUPP;
 422                 break;
 423         }
 424         wdev_unlock(wdev);
 425
 426         return err;
 427 }