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_RTNL();
  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                 if (wdev->wext.default_key != -1)
  39                         wdev->wext.connect.privacy = true;
  40         }
  41
  42         if (!wdev->wext.connect.ssid_len)
  43                 return 0;
  44
  45         if (wdev->wext.keys && wdev->wext.keys->def != -1) {
  46                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
  47                 if (!ck)
  48                         return -ENOMEM;
  49                 for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++)
  50                         ck->params[i].key = ck->data[i];
  51         }
  52
  53         if (wdev->wext.prev_bssid_valid)
  54                 prev_bssid = wdev->wext.prev_bssid;
  55
  56         err = cfg80211_connect(rdev, wdev->netdev,
  57                                &wdev->wext.connect, ck, prev_bssid);
  58         if (err)
  59                 kzfree(ck);
  60
  61         return err;
  62 }
  63
  64 int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
  65                               struct iw_request_info *info,
  66                               struct iw_freq *wextfreq, char *extra)
  67 {
  68         struct wireless_dev *wdev = dev->ieee80211_ptr;
  69         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  70         struct ieee80211_channel *chan = NULL;
  71         int err, freq;
  72
  73         /* call only for station! */
  74         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
  75                 return -EINVAL;
  76
  77         freq = cfg80211_wext_freq(wextfreq);
  78         if (freq < 0)
  79                 return freq;
  80
  81         if (freq) {
  82                 chan = ieee80211_get_channel(wdev->wiphy, freq);
  83                 if (!chan)
  84                         return -EINVAL;
  85                 if (chan->flags & IEEE80211_CHAN_DISABLED)
  86                         return -EINVAL;
  87         }
  88
  89         wdev_lock(wdev);
  90
  91         if (wdev->conn) {
  92                 bool event = true;
  93
  94                 if (wdev->wext.connect.channel == chan) {
  95                         err = 0;
  96                         goto out;
  97                 }
  98
  99                 /* if SSID set, we'll try right again, avoid event */
 100                 if (wdev->wext.connect.ssid_len)
 101                         event = false;
 102                 err = cfg80211_disconnect(rdev, dev,
 103                                           WLAN_REASON_DEAUTH_LEAVING, event);
 104                 if (err)
 105                         goto out;
 106         }
 107
 108         wdev->wext.connect.channel = chan;
 109         err = cfg80211_mgd_wext_connect(rdev, wdev);
 110  out:
 111         wdev_unlock(wdev);
 112         return err;
 113 }
 114
 115 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 116                               struct iw_request_info *info,
 117                               struct iw_freq *freq, char *extra)
 118 {
 119         struct wireless_dev *wdev = dev->ieee80211_ptr;
 120         struct ieee80211_channel *chan = NULL;
 121
 122         /* call only for station! */
 123         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 124                 return -EINVAL;
 125
 126         wdev_lock(wdev);
 127         if (wdev->current_bss)
 128                 chan = wdev->current_bss->pub.channel;
 129         else if (wdev->wext.connect.channel)
 130                 chan = wdev->wext.connect.channel;
 131         wdev_unlock(wdev);
 132
 133         if (chan) {
 134                 freq->m = chan->center_freq;
 135                 freq->e = 6;
 136                 return 0;
 137         }
 138
 139         /* no channel if not joining */
 140         return -EINVAL;
 141 }
 142
 143 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 144                                struct iw_request_info *info,
 145                                struct iw_point *data, char *ssid)
 146 {
 147         struct wireless_dev *wdev = dev->ieee80211_ptr;
 148         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 149         size_t len = data->length;
 150         int err;
 151
 152         /* call only for station! */
 153         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 154                 return -EINVAL;
 155
 156         if (!data->flags)
 157                 len = 0;
 158
 159         /* iwconfig uses nul termination in SSID.. */
 160         if (len > 0 && ssid[len - 1] == '\0')
 161                 len--;
 162
 163         wdev_lock(wdev);
 164
 165         err = 0;
 166
 167         if (wdev->conn) {
 168                 bool event = true;
 169
 170                 if (wdev->wext.connect.ssid && len &&
 171                     len == wdev->wext.connect.ssid_len &&
 172                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 173                         goto out;
 174
 175                 /* if SSID set now, we'll try to connect, avoid event */
 176                 if (len)
 177                         event = false;
 178                 err = cfg80211_disconnect(rdev, dev,
 179                                           WLAN_REASON_DEAUTH_LEAVING, event);
 180                 if (err)
 181                         goto out;
 182         }
 183
 184         wdev->wext.prev_bssid_valid = false;
 185         wdev->wext.connect.ssid = wdev->wext.ssid;
 186         memcpy(wdev->wext.ssid, ssid, len);
 187         wdev->wext.connect.ssid_len = len;
 188
 189         wdev->wext.connect.crypto.control_port = false;
 190         wdev->wext.connect.crypto.control_port_ethertype =
 191                                         cpu_to_be16(ETH_P_PAE);
 192
 193         err = cfg80211_mgd_wext_connect(rdev, wdev);
 194  out:
 195         wdev_unlock(wdev);
 196         return err;
 197 }
 198
 199 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 200                                struct iw_request_info *info,
 201                                struct iw_point *data, char *ssid)
 202 {
 203         struct wireless_dev *wdev = dev->ieee80211_ptr;
 204
 205         /* call only for station! */
 206         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 207                 return -EINVAL;
 208
 209         data->flags = 0;
 210
 211         wdev_lock(wdev);
 212         if (wdev->current_bss) {
 213                 const u8 *ie;
 214
 215                 rcu_read_lock();
 216                 ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
 217                                           WLAN_EID_SSID);
 218                 if (ie) {
 219                         data->flags = 1;
 220                         data->length = ie[1];
 221                         memcpy(ssid, ie + 2, data->length);
 222                 }
 223                 rcu_read_unlock();
 224         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 225                 data->flags = 1;
 226                 data->length = wdev->wext.connect.ssid_len;
 227                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 228         }
 229         wdev_unlock(wdev);
 230
 231         return 0;
 232 }
 233
 234 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 235                             struct iw_request_info *info,
 236                             struct sockaddr *ap_addr, char *extra)
 237 {
 238         struct wireless_dev *wdev = dev->ieee80211_ptr;
 239         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 240         u8 *bssid = ap_addr->sa_data;
 241         int err;
 242
 243         /* call only for station! */
 244         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 245                 return -EINVAL;
 246
 247         if (ap_addr->sa_family != ARPHRD_ETHER)
 248                 return -EINVAL;
 249
 250         /* automatic mode */
 251         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 252                 bssid = NULL;
 253
 254         wdev_lock(wdev);
 255
 256         if (wdev->conn) {
 257                 err = 0;
 258                 /* both automatic */
 259                 if (!bssid && !wdev->wext.connect.bssid)
 260                         goto out;
 261
 262                 /* fixed already - and no change */
 263                 if (wdev->wext.connect.bssid && bssid &&
 264                     ether_addr_equal(bssid, wdev->wext.connect.bssid))
 265                         goto out;
 266
 267                 err = cfg80211_disconnect(rdev, dev,
 268                                           WLAN_REASON_DEAUTH_LEAVING, false);
 269                 if (err)
 270                         goto out;
 271         }
 272
 273         if (bssid) {
 274                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 275                 wdev->wext.connect.bssid = wdev->wext.bssid;
 276         } else
 277                 wdev->wext.connect.bssid = NULL;
 278
 279         err = cfg80211_mgd_wext_connect(rdev, wdev);
 280  out:
 281         wdev_unlock(wdev);
 282         return err;
 283 }
 284
 285 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 286                             struct iw_request_info *info,
 287                             struct sockaddr *ap_addr, char *extra)
 288 {
 289         struct wireless_dev *wdev = dev->ieee80211_ptr;
 290
 291         /* call only for station! */
 292         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 293                 return -EINVAL;
 294
 295         ap_addr->sa_family = ARPHRD_ETHER;
 296
 297         wdev_lock(wdev);
 298         if (wdev->current_bss)
 299                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 300         else
 301                 eth_zero_addr(ap_addr->sa_data);
 302         wdev_unlock(wdev);
 303
 304         return 0;
 305 }
 306
 307 int cfg80211_wext_siwgenie(struct net_device *dev,
 308                            struct iw_request_info *info,
 309                            struct iw_point *data, char *extra)
 310 {
 311         struct wireless_dev *wdev = dev->ieee80211_ptr;
 312         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 313         u8 *ie = extra;
 314         int ie_len = data->length, err;
 315
 316         if (wdev->iftype != NL80211_IFTYPE_STATION)
 317                 return -EOPNOTSUPP;
 318
 319         if (!ie_len)
 320                 ie = NULL;
 321
 322         wdev_lock(wdev);
 323
 324         /* no change */
 325         err = 0;
 326         if (wdev->wext.ie_len == ie_len &&
 327             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 328                 goto out;
 329
 330         if (ie_len) {
 331                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 332                 if (!ie) {
 333                         err = -ENOMEM;
 334                         goto out;
 335                 }
 336         } else
 337                 ie = NULL;
 338
 339         kfree(wdev->wext.ie);
 340         wdev->wext.ie = ie;
 341         wdev->wext.ie_len = ie_len;
 342
 343         if (wdev->conn) {
 344                 err = cfg80211_disconnect(rdev, dev,
 345                                           WLAN_REASON_DEAUTH_LEAVING, false);
 346                 if (err)
 347                         goto out;
 348         }
 349
 350         /* userspace better not think we'll reconnect */
 351         err = 0;
 352  out:
 353         wdev_unlock(wdev);
 354         return err;
 355 }
 356
 357 int cfg80211_wext_siwmlme(struct net_device *dev,
 358                           struct iw_request_info *info,
 359                           struct iw_point *data, char *extra)
 360 {
 361         struct wireless_dev *wdev = dev->ieee80211_ptr;
 362         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 363         struct cfg80211_registered_device *rdev;
 364         int err;
 365
 366         if (!wdev)
 367                 return -EOPNOTSUPP;
 368
 369         rdev = wiphy_to_rdev(wdev->wiphy);
 370
 371         if (wdev->iftype != NL80211_IFTYPE_STATION)
 372                 return -EINVAL;
 373
 374         if (mlme->addr.sa_family != ARPHRD_ETHER)
 375                 return -EINVAL;
 376
 377         wdev_lock(wdev);
 378         switch (mlme->cmd) {
 379         case IW_MLME_DEAUTH:
 380         case IW_MLME_DISASSOC:
 381                 err = cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
 382                 break;
 383         default:
 384                 err = -EOPNOTSUPP;
 385                 break;
 386         }
 387         wdev_unlock(wdev);
 388
 389         return err;
 390 }