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                 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_rdev(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(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         wdev_lock(wdev);
  91
  92         if (wdev->conn) {
  93                 bool event = true;
  94
  95                 if (wdev->wext.connect.channel == chan) {
  96                         err = 0;
  97                         goto out;
  98                 }
  99
 100                 /* if SSID set, we'll try right again, avoid event */
 101                 if (wdev->wext.connect.ssid_len)
 102                         event = false;
 103                 err = cfg80211_disconnect(rdev, dev,
 104                                           WLAN_REASON_DEAUTH_LEAVING, event);
 105                 if (err)
 106                         goto out;
 107         }
 108
 109
 110         wdev->wext.connect.channel = chan;
 111
 112         /*
 113          * SSID is not set, we just want to switch monitor channel,
 114          * this is really just backward compatibility, if the SSID
 115          * is set then we use the channel to select the BSS to use
 116          * to connect to instead. If we were connected on another
 117          * channel we disconnected above and reconnect below.
 118          */
 119         if (chan && !wdev->wext.connect.ssid_len) {
 120                 struct cfg80211_chan_def chandef = {
 121                         .width = NL80211_CHAN_WIDTH_20_NOHT,
 122                         .center_freq1 = freq,
 123                 };
 124
 125                 chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
 126                 if (chandef.chan)
 127                         err = cfg80211_set_monitor_channel(rdev, &chandef);
 128                 else
 129                         err = -EINVAL;
 130                 goto out;
 131         }
 132
 133         err = cfg80211_mgd_wext_connect(rdev, wdev);
 134  out:
 135         wdev_unlock(wdev);
 136         return err;
 137 }
 138
 139 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 140                               struct iw_request_info *info,
 141                               struct iw_freq *freq, char *extra)
 142 {
 143         struct wireless_dev *wdev = dev->ieee80211_ptr;
 144         struct ieee80211_channel *chan = NULL;
 145
 146         /* call only for station! */
 147         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 148                 return -EINVAL;
 149
 150         wdev_lock(wdev);
 151         if (wdev->current_bss)
 152                 chan = wdev->current_bss->pub.channel;
 153         else if (wdev->wext.connect.channel)
 154                 chan = wdev->wext.connect.channel;
 155         wdev_unlock(wdev);
 156
 157         if (chan) {
 158                 freq->m = chan->center_freq;
 159                 freq->e = 6;
 160                 return 0;
 161         }
 162
 163         /* no channel if not joining */
 164         return -EINVAL;
 165 }
 166
 167 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 168                                struct iw_request_info *info,
 169                                struct iw_point *data, char *ssid)
 170 {
 171         struct wireless_dev *wdev = dev->ieee80211_ptr;
 172         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 173         size_t len = data->length;
 174         int err;
 175
 176         /* call only for station! */
 177         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 178                 return -EINVAL;
 179
 180         if (!data->flags)
 181                 len = 0;
 182
 183         /* iwconfig uses nul termination in SSID.. */
 184         if (len > 0 && ssid[len - 1] == '\0')
 185                 len--;
 186
 187         wdev_lock(wdev);
 188
 189         err = 0;
 190
 191         if (wdev->conn) {
 192                 bool event = true;
 193
 194                 if (wdev->wext.connect.ssid && len &&
 195                     len == wdev->wext.connect.ssid_len &&
 196                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 197                         goto out;
 198
 199                 /* if SSID set now, we'll try to connect, avoid event */
 200                 if (len)
 201                         event = false;
 202                 err = cfg80211_disconnect(rdev, dev,
 203                                           WLAN_REASON_DEAUTH_LEAVING, event);
 204                 if (err)
 205                         goto out;
 206         }
 207
 208         wdev->wext.prev_bssid_valid = false;
 209         wdev->wext.connect.ssid = wdev->wext.ssid;
 210         memcpy(wdev->wext.ssid, ssid, len);
 211         wdev->wext.connect.ssid_len = len;
 212
 213         wdev->wext.connect.crypto.control_port = false;
 214         wdev->wext.connect.crypto.control_port_ethertype =
 215                                         cpu_to_be16(ETH_P_PAE);
 216
 217         err = cfg80211_mgd_wext_connect(rdev, wdev);
 218  out:
 219         wdev_unlock(wdev);
 220         return err;
 221 }
 222
 223 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 224                                struct iw_request_info *info,
 225                                struct iw_point *data, char *ssid)
 226 {
 227         struct wireless_dev *wdev = dev->ieee80211_ptr;
 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                         memcpy(ssid, ie + 2, data->length);
 246                 }
 247                 rcu_read_unlock();
 248         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 249                 data->flags = 1;
 250                 data->length = wdev->wext.connect.ssid_len;
 251                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 252         }
 253         wdev_unlock(wdev);
 254
 255         return 0;
 256 }
 257
 258 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 259                             struct iw_request_info *info,
 260                             struct sockaddr *ap_addr, char *extra)
 261 {
 262         struct wireless_dev *wdev = dev->ieee80211_ptr;
 263         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 264         u8 *bssid = ap_addr->sa_data;
 265         int err;
 266
 267         /* call only for station! */
 268         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 269                 return -EINVAL;
 270
 271         if (ap_addr->sa_family != ARPHRD_ETHER)
 272                 return -EINVAL;
 273
 274         /* automatic mode */
 275         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 276                 bssid = NULL;
 277
 278         wdev_lock(wdev);
 279
 280         if (wdev->conn) {
 281                 err = 0;
 282                 /* both automatic */
 283                 if (!bssid && !wdev->wext.connect.bssid)
 284                         goto out;
 285
 286                 /* fixed already - and no change */
 287                 if (wdev->wext.connect.bssid && bssid &&
 288                     ether_addr_equal(bssid, wdev->wext.connect.bssid))
 289                         goto out;
 290
 291                 err = cfg80211_disconnect(rdev, dev,
 292                                           WLAN_REASON_DEAUTH_LEAVING, false);
 293                 if (err)
 294                         goto out;
 295         }
 296
 297         if (bssid) {
 298                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 299                 wdev->wext.connect.bssid = wdev->wext.bssid;
 300         } else
 301                 wdev->wext.connect.bssid = NULL;
 302
 303         err = cfg80211_mgd_wext_connect(rdev, wdev);
 304  out:
 305         wdev_unlock(wdev);
 306         return err;
 307 }
 308
 309 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 310                             struct iw_request_info *info,
 311                             struct sockaddr *ap_addr, char *extra)
 312 {
 313         struct wireless_dev *wdev = dev->ieee80211_ptr;
 314
 315         /* call only for station! */
 316         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 317                 return -EINVAL;
 318
 319         ap_addr->sa_family = ARPHRD_ETHER;
 320
 321         wdev_lock(wdev);
 322         if (wdev->current_bss)
 323                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 324         else
 325                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 326         wdev_unlock(wdev);
 327
 328         return 0;
 329 }
 330
 331 int cfg80211_wext_siwgenie(struct net_device *dev,
 332                            struct iw_request_info *info,
 333                            struct iw_point *data, char *extra)
 334 {
 335         struct wireless_dev *wdev = dev->ieee80211_ptr;
 336         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 337         u8 *ie = extra;
 338         int ie_len = data->length, err;
 339
 340         if (wdev->iftype != NL80211_IFTYPE_STATION)
 341                 return -EOPNOTSUPP;
 342
 343         if (!ie_len)
 344                 ie = NULL;
 345
 346         wdev_lock(wdev);
 347
 348         /* no change */
 349         err = 0;
 350         if (wdev->wext.ie_len == ie_len &&
 351             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 352                 goto out;
 353
 354         if (ie_len) {
 355                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 356                 if (!ie) {
 357                         err = -ENOMEM;
 358                         goto out;
 359                 }
 360         } else
 361                 ie = NULL;
 362
 363         kfree(wdev->wext.ie);
 364         wdev->wext.ie = ie;
 365         wdev->wext.ie_len = ie_len;
 366
 367         if (wdev->conn) {
 368                 err = cfg80211_disconnect(rdev, dev,
 369                                           WLAN_REASON_DEAUTH_LEAVING, false);
 370                 if (err)
 371                         goto out;
 372         }
 373
 374         /* userspace better not think we'll reconnect */
 375         err = 0;
 376  out:
 377         wdev_unlock(wdev);
 378         return err;
 379 }
 380
 381 int cfg80211_wext_siwmlme(struct net_device *dev,
 382                           struct iw_request_info *info,
 383                           struct iw_point *data, char *extra)
 384 {
 385         struct wireless_dev *wdev = dev->ieee80211_ptr;
 386         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 387         struct cfg80211_registered_device *rdev;
 388         int err;
 389
 390         if (!wdev)
 391                 return -EOPNOTSUPP;
 392
 393         rdev = wiphy_to_rdev(wdev->wiphy);
 394
 395         if (wdev->iftype != NL80211_IFTYPE_STATION)
 396                 return -EINVAL;
 397
 398         if (mlme->addr.sa_family != ARPHRD_ETHER)
 399                 return -EINVAL;
 400
 401         wdev_lock(wdev);
 402         switch (mlme->cmd) {
 403         case IW_MLME_DEAUTH:
 404         case IW_MLME_DISASSOC:
 405                 err = cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
 406                 break;
 407         default:
 408                 err = -EOPNOTSUPP;
 409                 break;
 410         }
 411         wdev_unlock(wdev);
 412
 413         return err;
 414 }