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
 109         wdev->wext.connect.channel = chan;
 110
 111         /*
 112          * SSID is not set, we just want to switch monitor channel,
 113          * this is really just backward compatibility, if the SSID
 114          * is set then we use the channel to select the BSS to use
 115          * to connect to instead. If we were connected on another
 116          * channel we disconnected above and reconnect below.
 117          */
 118         if (chan && !wdev->wext.connect.ssid_len) {
 119                 struct cfg80211_chan_def chandef = {
 120                         .width = NL80211_CHAN_WIDTH_20_NOHT,
 121                         .center_freq1 = freq,
 122                 };
 123
 124                 chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
 125                 if (chandef.chan)
 126                         err = cfg80211_set_monitor_channel(rdev, &chandef);
 127                 else
 128                         err = -EINVAL;
 129                 goto out;
 130         }
 131
 132         err = cfg80211_mgd_wext_connect(rdev, wdev);
 133  out:
 134         wdev_unlock(wdev);
 135         return err;
 136 }
 137
 138 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 139                               struct iw_request_info *info,
 140                               struct iw_freq *freq, char *extra)
 141 {
 142         struct wireless_dev *wdev = dev->ieee80211_ptr;
 143         struct ieee80211_channel *chan = NULL;
 144
 145         /* call only for station! */
 146         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 147                 return -EINVAL;
 148
 149         wdev_lock(wdev);
 150         if (wdev->current_bss)
 151                 chan = wdev->current_bss->pub.channel;
 152         else if (wdev->wext.connect.channel)
 153                 chan = wdev->wext.connect.channel;
 154         wdev_unlock(wdev);
 155
 156         if (chan) {
 157                 freq->m = chan->center_freq;
 158                 freq->e = 6;
 159                 return 0;
 160         }
 161
 162         /* no channel if not joining */
 163         return -EINVAL;
 164 }
 165
 166 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 167                                struct iw_request_info *info,
 168                                struct iw_point *data, char *ssid)
 169 {
 170         struct wireless_dev *wdev = dev->ieee80211_ptr;
 171         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 172         size_t len = data->length;
 173         int err;
 174
 175         /* call only for station! */
 176         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 177                 return -EINVAL;
 178
 179         if (!data->flags)
 180                 len = 0;
 181
 182         /* iwconfig uses nul termination in SSID.. */
 183         if (len > 0 && ssid[len - 1] == '\0')
 184                 len--;
 185
 186         wdev_lock(wdev);
 187
 188         err = 0;
 189
 190         if (wdev->conn) {
 191                 bool event = true;
 192
 193                 if (wdev->wext.connect.ssid && len &&
 194                     len == wdev->wext.connect.ssid_len &&
 195                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 196                         goto out;
 197
 198                 /* if SSID set now, we'll try to connect, avoid event */
 199                 if (len)
 200                         event = false;
 201                 err = cfg80211_disconnect(rdev, dev,
 202                                           WLAN_REASON_DEAUTH_LEAVING, event);
 203                 if (err)
 204                         goto out;
 205         }
 206
 207         wdev->wext.prev_bssid_valid = false;
 208         wdev->wext.connect.ssid = wdev->wext.ssid;
 209         memcpy(wdev->wext.ssid, ssid, len);
 210         wdev->wext.connect.ssid_len = len;
 211
 212         wdev->wext.connect.crypto.control_port = false;
 213         wdev->wext.connect.crypto.control_port_ethertype =
 214                                         cpu_to_be16(ETH_P_PAE);
 215
 216         err = cfg80211_mgd_wext_connect(rdev, wdev);
 217  out:
 218         wdev_unlock(wdev);
 219         return err;
 220 }
 221
 222 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 223                                struct iw_request_info *info,
 224                                struct iw_point *data, char *ssid)
 225 {
 226         struct wireless_dev *wdev = dev->ieee80211_ptr;
 227         int ret = 0;
 228
 229         /* call only for station! */
 230         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 231                 return -EINVAL;
 232
 233         data->flags = 0;
 234
 235         wdev_lock(wdev);
 236         if (wdev->current_bss) {
 237                 const u8 *ie;
 238
 239                 rcu_read_lock();
 240                 ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
 241                                           WLAN_EID_SSID);
 242                 if (ie) {
 243                         data->flags = 1;
 244                         data->length = ie[1];
 245                         if (data->length > IW_ESSID_MAX_SIZE)
 246                                 ret = -EINVAL;
 247                         else
 248                                 memcpy(ssid, ie + 2, data->length);
 249                 }
 250                 rcu_read_unlock();
 251         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 252                 data->flags = 1;
 253                 data->length = wdev->wext.connect.ssid_len;
 254                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 255         }
 256         wdev_unlock(wdev);
 257
 258         return ret;
 259 }
 260
 261 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 262                             struct iw_request_info *info,
 263                             struct sockaddr *ap_addr, char *extra)
 264 {
 265         struct wireless_dev *wdev = dev->ieee80211_ptr;
 266         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 267         u8 *bssid = ap_addr->sa_data;
 268         int err;
 269
 270         /* call only for station! */
 271         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 272                 return -EINVAL;
 273
 274         if (ap_addr->sa_family != ARPHRD_ETHER)
 275                 return -EINVAL;
 276
 277         /* automatic mode */
 278         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 279                 bssid = NULL;
 280
 281         wdev_lock(wdev);
 282
 283         if (wdev->conn) {
 284                 err = 0;
 285                 /* both automatic */
 286                 if (!bssid && !wdev->wext.connect.bssid)
 287                         goto out;
 288
 289                 /* fixed already - and no change */
 290                 if (wdev->wext.connect.bssid && bssid &&
 291                     ether_addr_equal(bssid, wdev->wext.connect.bssid))
 292                         goto out;
 293
 294                 err = cfg80211_disconnect(rdev, dev,
 295                                           WLAN_REASON_DEAUTH_LEAVING, false);
 296                 if (err)
 297                         goto out;
 298         }
 299
 300         if (bssid) {
 301                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 302                 wdev->wext.connect.bssid = wdev->wext.bssid;
 303         } else
 304                 wdev->wext.connect.bssid = NULL;
 305
 306         err = cfg80211_mgd_wext_connect(rdev, wdev);
 307  out:
 308         wdev_unlock(wdev);
 309         return err;
 310 }
 311
 312 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 313                             struct iw_request_info *info,
 314                             struct sockaddr *ap_addr, char *extra)
 315 {
 316         struct wireless_dev *wdev = dev->ieee80211_ptr;
 317
 318         /* call only for station! */
 319         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 320                 return -EINVAL;
 321
 322         ap_addr->sa_family = ARPHRD_ETHER;
 323
 324         wdev_lock(wdev);
 325         if (wdev->current_bss)
 326                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 327         else
 328                 eth_zero_addr(ap_addr->sa_data);
 329         wdev_unlock(wdev);
 330
 331         return 0;
 332 }
 333
 334 int cfg80211_wext_siwgenie(struct net_device *dev,
 335                            struct iw_request_info *info,
 336                            struct iw_point *data, char *extra)
 337 {
 338         struct wireless_dev *wdev = dev->ieee80211_ptr;
 339         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 340         u8 *ie = extra;
 341         int ie_len = data->length, err;
 342
 343         if (wdev->iftype != NL80211_IFTYPE_STATION)
 344                 return -EOPNOTSUPP;
 345
 346         if (!ie_len)
 347                 ie = NULL;
 348
 349         wdev_lock(wdev);
 350
 351         /* no change */
 352         err = 0;
 353         if (wdev->wext.ie_len == ie_len &&
 354             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 355                 goto out;
 356
 357         if (ie_len) {
 358                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 359                 if (!ie) {
 360                         err = -ENOMEM;
 361                         goto out;
 362                 }
 363         } else
 364                 ie = NULL;
 365
 366         kfree(wdev->wext.ie);
 367         wdev->wext.ie = ie;
 368         wdev->wext.ie_len = ie_len;
 369
 370         if (wdev->conn) {
 371                 err = cfg80211_disconnect(rdev, dev,
 372                                           WLAN_REASON_DEAUTH_LEAVING, false);
 373                 if (err)
 374                         goto out;
 375         }
 376
 377         /* userspace better not think we'll reconnect */
 378         err = 0;
 379  out:
 380         wdev_unlock(wdev);
 381         return err;
 382 }
 383
 384 int cfg80211_wext_siwmlme(struct net_device *dev,
 385                           struct iw_request_info *info,
 386                           struct iw_point *data, char *extra)
 387 {
 388         struct wireless_dev *wdev = dev->ieee80211_ptr;
 389         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 390         struct cfg80211_registered_device *rdev;
 391         int err;
 392
 393         if (!wdev)
 394                 return -EOPNOTSUPP;
 395
 396         rdev = wiphy_to_rdev(wdev->wiphy);
 397
 398         if (wdev->iftype != NL80211_IFTYPE_STATION)
 399                 return -EINVAL;
 400
 401         if (mlme->addr.sa_family != ARPHRD_ETHER)
 402                 return -EINVAL;
 403
 404         wdev_lock(wdev);
 405         switch (mlme->cmd) {
 406         case IW_MLME_DEAUTH:
 407         case IW_MLME_DISASSOC:
 408                 err = cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
 409                 break;
 410         default:
 411                 err = -EOPNOTSUPP;
 412                 break;
 413         }
 414         wdev_unlock(wdev);
 415
 416         return err;
 417 }