net/wireless/wext-sme.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * cfg80211 wext compat for managed mode.
   4  *
   5  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright (C) 2009, 2020-2021 Intel Corporation.
   7  */
   8
   9 #include <linux/export.h>
  10 #include <linux/etherdevice.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/slab.h>
  13 #include <net/cfg80211.h>
  14 #include <net/cfg80211-wext.h>
  15 #include "wext-compat.h"
  16 #include "nl80211.h"
  17
  18 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
  19                               struct wireless_dev *wdev)
  20 {
  21         struct cfg80211_cached_keys *ck = NULL;
  22         const u8 *prev_bssid = NULL;
  23         int err, i;
  24
  25         ASSERT_RTNL();
  26         ASSERT_WDEV_LOCK(wdev);
  27
  28         if (!netif_running(wdev->netdev))
  29                 return 0;
  30
  31         wdev->wext.connect.ie = wdev->wext.ie;
  32         wdev->wext.connect.ie_len = wdev->wext.ie_len;
  33
  34         /* Use default background scan period */
  35         wdev->wext.connect.bg_scan_period = -1;
  36
  37         if (wdev->wext.keys) {
  38                 wdev->wext.keys->def = wdev->wext.default_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 && wdev->wext.keys->def != -1) {
  47                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
  48                 if (!ck)
  49                         return -ENOMEM;
  50                 for (i = 0; i < CFG80211_MAX_WEP_KEYS; 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_sensitive(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         wdev->wext.connect.channel = chan;
 110         err = cfg80211_mgd_wext_connect(rdev, wdev);
 111  out:
 112         wdev_unlock(wdev);
 113         return err;
 114 }
 115
 116 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 117                               struct iw_request_info *info,
 118                               struct iw_freq *freq, char *extra)
 119 {
 120         struct wireless_dev *wdev = dev->ieee80211_ptr;
 121         struct ieee80211_channel *chan = NULL;
 122
 123         /* call only for station! */
 124         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 125                 return -EINVAL;
 126
 127         wdev_lock(wdev);
 128         if (wdev->current_bss)
 129                 chan = wdev->current_bss->pub.channel;
 130         else if (wdev->wext.connect.channel)
 131                 chan = wdev->wext.connect.channel;
 132         wdev_unlock(wdev);
 133
 134         if (chan) {
 135                 freq->m = chan->center_freq;
 136                 freq->e = 6;
 137                 return 0;
 138         }
 139
 140         /* no channel if not joining */
 141         return -EINVAL;
 142 }
 143
 144 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 145                                struct iw_request_info *info,
 146                                struct iw_point *data, char *ssid)
 147 {
 148         struct wireless_dev *wdev = dev->ieee80211_ptr;
 149         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 150         size_t len = data->length;
 151         int err;
 152
 153         /* call only for station! */
 154         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 155                 return -EINVAL;
 156
 157         if (!data->flags)
 158                 len = 0;
 159
 160         /* iwconfig uses nul termination in SSID.. */
 161         if (len > 0 && ssid[len - 1] == '\0')
 162                 len--;
 163
 164         wdev_lock(wdev);
 165
 166         err = 0;
 167
 168         if (wdev->conn) {
 169                 bool event = true;
 170
 171                 if (wdev->wext.connect.ssid && len &&
 172                     len == wdev->wext.connect.ssid_len &&
 173                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 174                         goto out;
 175
 176                 /* if SSID set now, we'll try to connect, avoid event */
 177                 if (len)
 178                         event = false;
 179                 err = cfg80211_disconnect(rdev, dev,
 180                                           WLAN_REASON_DEAUTH_LEAVING, event);
 181                 if (err)
 182                         goto out;
 183         }
 184
 185         wdev->wext.prev_bssid_valid = false;
 186         wdev->wext.connect.ssid = wdev->wext.ssid;
 187         memcpy(wdev->wext.ssid, ssid, len);
 188         wdev->wext.connect.ssid_len = len;
 189
 190         wdev->wext.connect.crypto.control_port = false;
 191         wdev->wext.connect.crypto.control_port_ethertype =
 192                                         cpu_to_be16(ETH_P_PAE);
 193
 194         err = cfg80211_mgd_wext_connect(rdev, wdev);
 195  out:
 196         wdev_unlock(wdev);
 197         return err;
 198 }
 199
 200 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 201                                struct iw_request_info *info,
 202                                struct iw_point *data, char *ssid)
 203 {
 204         struct wireless_dev *wdev = dev->ieee80211_ptr;
 205         int ret = 0;
 206
 207         /* call only for station! */
 208         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 209                 return -EINVAL;
 210
 211         data->flags = 0;
 212
 213         wdev_lock(wdev);
 214         if (wdev->current_bss) {
 215                 const struct element *ssid_elem;
 216
 217                 rcu_read_lock();
 218                 ssid_elem = ieee80211_bss_get_elem(&wdev->current_bss->pub,
 219                                                    WLAN_EID_SSID);
 220                 if (ssid_elem) {
 221                         data->flags = 1;
 222                         data->length = ssid_elem->datalen;
 223                         if (data->length > IW_ESSID_MAX_SIZE)
 224                                 ret = -EINVAL;
 225                         else
 226                                 memcpy(ssid, ssid_elem->data, data->length);
 227                 }
 228                 rcu_read_unlock();
 229         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 230                 data->flags = 1;
 231                 data->length = wdev->wext.connect.ssid_len;
 232                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 233         }
 234         wdev_unlock(wdev);
 235
 236         return ret;
 237 }
 238
 239 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 240                             struct iw_request_info *info,
 241                             struct sockaddr *ap_addr, char *extra)
 242 {
 243         struct wireless_dev *wdev = dev->ieee80211_ptr;
 244         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 245         u8 *bssid = ap_addr->sa_data;
 246         int err;
 247
 248         /* call only for station! */
 249         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 250                 return -EINVAL;
 251
 252         if (ap_addr->sa_family != ARPHRD_ETHER)
 253                 return -EINVAL;
 254
 255         /* automatic mode */
 256         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 257                 bssid = NULL;
 258
 259         wdev_lock(wdev);
 260
 261         if (wdev->conn) {
 262                 err = 0;
 263                 /* both automatic */
 264                 if (!bssid && !wdev->wext.connect.bssid)
 265                         goto out;
 266
 267                 /* fixed already - and no change */
 268                 if (wdev->wext.connect.bssid && bssid &&
 269                     ether_addr_equal(bssid, wdev->wext.connect.bssid))
 270                         goto out;
 271
 272                 err = cfg80211_disconnect(rdev, dev,
 273                                           WLAN_REASON_DEAUTH_LEAVING, false);
 274                 if (err)
 275                         goto out;
 276         }
 277
 278         if (bssid) {
 279                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 280                 wdev->wext.connect.bssid = wdev->wext.bssid;
 281         } else
 282                 wdev->wext.connect.bssid = NULL;
 283
 284         err = cfg80211_mgd_wext_connect(rdev, wdev);
 285  out:
 286         wdev_unlock(wdev);
 287         return err;
 288 }
 289
 290 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 291                             struct iw_request_info *info,
 292                             struct sockaddr *ap_addr, char *extra)
 293 {
 294         struct wireless_dev *wdev = dev->ieee80211_ptr;
 295
 296         /* call only for station! */
 297         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 298                 return -EINVAL;
 299
 300         ap_addr->sa_family = ARPHRD_ETHER;
 301
 302         wdev_lock(wdev);
 303         if (wdev->current_bss)
 304                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 305         else
 306                 eth_zero_addr(ap_addr->sa_data);
 307         wdev_unlock(wdev);
 308
 309         return 0;
 310 }
 311
 312 int cfg80211_wext_siwgenie(struct net_device *dev,
 313                            struct iw_request_info *info,
 314                            struct iw_point *data, char *extra)
 315 {
 316         struct wireless_dev *wdev = dev->ieee80211_ptr;
 317         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 318         u8 *ie = extra;
 319         int ie_len = data->length, err;
 320
 321         if (wdev->iftype != NL80211_IFTYPE_STATION)
 322                 return -EOPNOTSUPP;
 323
 324         if (!ie_len)
 325                 ie = NULL;
 326
 327         wdev_lock(wdev);
 328
 329         /* no change */
 330         err = 0;
 331         if (wdev->wext.ie_len == ie_len &&
 332             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 333                 goto out;
 334
 335         if (ie_len) {
 336                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 337                 if (!ie) {
 338                         err = -ENOMEM;
 339                         goto out;
 340                 }
 341         } else
 342                 ie = NULL;
 343
 344         kfree(wdev->wext.ie);
 345         wdev->wext.ie = ie;
 346         wdev->wext.ie_len = ie_len;
 347
 348         if (wdev->conn) {
 349                 err = cfg80211_disconnect(rdev, dev,
 350                                           WLAN_REASON_DEAUTH_LEAVING, false);
 351                 if (err)
 352                         goto out;
 353         }
 354
 355         /* userspace better not think we'll reconnect */
 356         err = 0;
 357  out:
 358         wdev_unlock(wdev);
 359         return err;
 360 }
 361
 362 int cfg80211_wext_siwmlme(struct net_device *dev,
 363                           struct iw_request_info *info,
 364                           struct iw_point *data, char *extra)
 365 {
 366         struct wireless_dev *wdev = dev->ieee80211_ptr;
 367         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 368         struct cfg80211_registered_device *rdev;
 369         int err;
 370
 371         if (!wdev)
 372                 return -EOPNOTSUPP;
 373
 374         rdev = wiphy_to_rdev(wdev->wiphy);
 375
 376         if (wdev->iftype != NL80211_IFTYPE_STATION)
 377                 return -EINVAL;
 378
 379         if (mlme->addr.sa_family != ARPHRD_ETHER)
 380                 return -EINVAL;
 381
 382         wiphy_lock(&rdev->wiphy);
 383         wdev_lock(wdev);
 384         switch (mlme->cmd) {
 385         case IW_MLME_DEAUTH:
 386         case IW_MLME_DISASSOC:
 387                 err = cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
 388                 break;
 389         default:
 390                 err = -EOPNOTSUPP;
 391                 break;
 392         }
 393         wdev_unlock(wdev);
 394         wiphy_unlock(&rdev->wiphy);
 395
 396         return err;
 397 }