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         /* SSID is not set, we just want to switch channel */
 115         if (chan && !wdev->wext.connect.ssid_len) {
 116                 err = cfg80211_set_freq(rdev, wdev, freq, NL80211_CHAN_NO_HT);
 117                 goto out;
 118         }
 119
 120         err = cfg80211_mgd_wext_connect(rdev, wdev);
 121  out:
 122         wdev_unlock(wdev);
 123         mutex_unlock(&rdev->devlist_mtx);
 124         cfg80211_unlock_rdev(rdev);
 125         return err;
 126 }
 127
 128 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 129                               struct iw_request_info *info,
 130                               struct iw_freq *freq, char *extra)
 131 {
 132         struct wireless_dev *wdev = dev->ieee80211_ptr;
 133         struct ieee80211_channel *chan = NULL;
 134
 135         /* call only for station! */
 136         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 137                 return -EINVAL;
 138
 139         wdev_lock(wdev);
 140         if (wdev->current_bss)
 141                 chan = wdev->current_bss->pub.channel;
 142         else if (wdev->wext.connect.channel)
 143                 chan = wdev->wext.connect.channel;
 144         wdev_unlock(wdev);
 145
 146         if (chan) {
 147                 freq->m = chan->center_freq;
 148                 freq->e = 6;
 149                 return 0;
 150         }
 151
 152         /* no channel if not joining */
 153         return -EINVAL;
 154 }
 155
 156 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 157                                struct iw_request_info *info,
 158                                struct iw_point *data, char *ssid)
 159 {
 160         struct wireless_dev *wdev = dev->ieee80211_ptr;
 161         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 162         size_t len = data->length;
 163         int err;
 164
 165         /* call only for station! */
 166         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 167                 return -EINVAL;
 168
 169         if (!data->flags)
 170                 len = 0;
 171
 172         /* iwconfig uses nul termination in SSID.. */
 173         if (len > 0 && ssid[len - 1] == '\0')
 174                 len--;
 175
 176         cfg80211_lock_rdev(rdev);
 177         mutex_lock(&rdev->devlist_mtx);
 178         wdev_lock(wdev);
 179
 180         err = 0;
 181
 182         if (wdev->sme_state != CFG80211_SME_IDLE) {
 183                 bool event = true;
 184
 185                 if (wdev->wext.connect.ssid && len &&
 186                     len == wdev->wext.connect.ssid_len &&
 187                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 188                         goto out;
 189
 190                 /* if SSID set now, we'll try to connect, avoid event */
 191                 if (len)
 192                         event = false;
 193                 err = __cfg80211_disconnect(rdev, dev,
 194                                             WLAN_REASON_DEAUTH_LEAVING, event);
 195                 if (err)
 196                         goto out;
 197         }
 198
 199         wdev->wext.prev_bssid_valid = false;
 200         wdev->wext.connect.ssid = wdev->wext.ssid;
 201         memcpy(wdev->wext.ssid, ssid, len);
 202         wdev->wext.connect.ssid_len = len;
 203
 204         wdev->wext.connect.crypto.control_port = false;
 205         wdev->wext.connect.crypto.control_port_ethertype =
 206                                         cpu_to_be16(ETH_P_PAE);
 207
 208         err = cfg80211_mgd_wext_connect(rdev, wdev);
 209  out:
 210         wdev_unlock(wdev);
 211         mutex_unlock(&rdev->devlist_mtx);
 212         cfg80211_unlock_rdev(rdev);
 213         return err;
 214 }
 215
 216 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 217                                struct iw_request_info *info,
 218                                struct iw_point *data, char *ssid)
 219 {
 220         struct wireless_dev *wdev = dev->ieee80211_ptr;
 221
 222         /* call only for station! */
 223         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 224                 return -EINVAL;
 225
 226         data->flags = 0;
 227
 228         wdev_lock(wdev);
 229         if (wdev->current_bss) {
 230                 const u8 *ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
 231                                                     WLAN_EID_SSID);
 232                 if (ie) {
 233                         data->flags = 1;
 234                         data->length = ie[1];
 235                         memcpy(ssid, ie + 2, data->length);
 236                 }
 237         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 238                 data->flags = 1;
 239                 data->length = wdev->wext.connect.ssid_len;
 240                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 241         }
 242         wdev_unlock(wdev);
 243
 244         return 0;
 245 }
 246
 247 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 248                             struct iw_request_info *info,
 249                             struct sockaddr *ap_addr, char *extra)
 250 {
 251         struct wireless_dev *wdev = dev->ieee80211_ptr;
 252         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 253         u8 *bssid = ap_addr->sa_data;
 254         int err;
 255
 256         /* call only for station! */
 257         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 258                 return -EINVAL;
 259
 260         if (ap_addr->sa_family != ARPHRD_ETHER)
 261                 return -EINVAL;
 262
 263         /* automatic mode */
 264         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 265                 bssid = NULL;
 266
 267         cfg80211_lock_rdev(rdev);
 268         mutex_lock(&rdev->devlist_mtx);
 269         wdev_lock(wdev);
 270
 271         if (wdev->sme_state != CFG80211_SME_IDLE) {
 272                 err = 0;
 273                 /* both automatic */
 274                 if (!bssid && !wdev->wext.connect.bssid)
 275                         goto out;
 276
 277                 /* fixed already - and no change */
 278                 if (wdev->wext.connect.bssid && bssid &&
 279                     ether_addr_equal(bssid, wdev->wext.connect.bssid))
 280                         goto out;
 281
 282                 err = __cfg80211_disconnect(rdev, dev,
 283                                             WLAN_REASON_DEAUTH_LEAVING, false);
 284                 if (err)
 285                         goto out;
 286         }
 287
 288         if (bssid) {
 289                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 290                 wdev->wext.connect.bssid = wdev->wext.bssid;
 291         } else
 292                 wdev->wext.connect.bssid = NULL;
 293
 294         err = cfg80211_mgd_wext_connect(rdev, wdev);
 295  out:
 296         wdev_unlock(wdev);
 297         mutex_unlock(&rdev->devlist_mtx);
 298         cfg80211_unlock_rdev(rdev);
 299         return err;
 300 }
 301
 302 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 303                             struct iw_request_info *info,
 304                             struct sockaddr *ap_addr, char *extra)
 305 {
 306         struct wireless_dev *wdev = dev->ieee80211_ptr;
 307
 308         /* call only for station! */
 309         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 310                 return -EINVAL;
 311
 312         ap_addr->sa_family = ARPHRD_ETHER;
 313
 314         wdev_lock(wdev);
 315         if (wdev->current_bss)
 316                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 317         else
 318                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 319         wdev_unlock(wdev);
 320
 321         return 0;
 322 }
 323
 324 int cfg80211_wext_siwgenie(struct net_device *dev,
 325                            struct iw_request_info *info,
 326                            struct iw_point *data, char *extra)
 327 {
 328         struct wireless_dev *wdev = dev->ieee80211_ptr;
 329         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 330         u8 *ie = extra;
 331         int ie_len = data->length, err;
 332
 333         if (wdev->iftype != NL80211_IFTYPE_STATION)
 334                 return -EOPNOTSUPP;
 335
 336         if (!ie_len)
 337                 ie = NULL;
 338
 339         wdev_lock(wdev);
 340
 341         /* no change */
 342         err = 0;
 343         if (wdev->wext.ie_len == ie_len &&
 344             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 345                 goto out;
 346
 347         if (ie_len) {
 348                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 349                 if (!ie) {
 350                         err = -ENOMEM;
 351                         goto out;
 352                 }
 353         } else
 354                 ie = NULL;
 355
 356         kfree(wdev->wext.ie);
 357         wdev->wext.ie = ie;
 358         wdev->wext.ie_len = ie_len;
 359
 360         if (wdev->sme_state != CFG80211_SME_IDLE) {
 361                 err = __cfg80211_disconnect(rdev, dev,
 362                                             WLAN_REASON_DEAUTH_LEAVING, false);
 363                 if (err)
 364                         goto out;
 365         }
 366
 367         /* userspace better not think we'll reconnect */
 368         err = 0;
 369  out:
 370         wdev_unlock(wdev);
 371         return err;
 372 }
 373
 374 int cfg80211_wext_siwmlme(struct net_device *dev,
 375                           struct iw_request_info *info,
 376                           struct iw_point *data, char *extra)
 377 {
 378         struct wireless_dev *wdev = dev->ieee80211_ptr;
 379         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 380         struct cfg80211_registered_device *rdev;
 381         int err;
 382
 383         if (!wdev)
 384                 return -EOPNOTSUPP;
 385
 386         rdev = wiphy_to_dev(wdev->wiphy);
 387
 388         if (wdev->iftype != NL80211_IFTYPE_STATION)
 389                 return -EINVAL;
 390
 391         if (mlme->addr.sa_family != ARPHRD_ETHER)
 392                 return -EINVAL;
 393
 394         wdev_lock(wdev);
 395         switch (mlme->cmd) {
 396         case IW_MLME_DEAUTH:
 397         case IW_MLME_DISASSOC:
 398                 err = __cfg80211_disconnect(rdev, dev, mlme->reason_code,
 399                                             true);
 400                 break;
 401         default:
 402                 err = -EOPNOTSUPP;
 403                 break;
 404         }
 405         wdev_unlock(wdev);
 406
 407         return err;
 408 }