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, 2020-2023 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         lockdep_assert_wiphy(wdev->wiphy);
  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 < 4; 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         if (wdev->conn) {
  91                 bool event = true;
  92
  93                 if (wdev->wext.connect.channel == chan)
  94                         return 0;
  95
  96                 /* if SSID set, we'll try right again, avoid event */
  97                 if (wdev->wext.connect.ssid_len)
  98                         event = false;
  99                 err = cfg80211_disconnect(rdev, dev,
 100                                           WLAN_REASON_DEAUTH_LEAVING, event);
 101                 if (err)
 102                         return err;
 103         }
 104
 105         wdev->wext.connect.channel = chan;
 106         return cfg80211_mgd_wext_connect(rdev, wdev);
 107 }
 108
 109 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 110                               struct iw_request_info *info,
 111                               struct iw_freq *freq, char *extra)
 112 {
 113         struct wireless_dev *wdev = dev->ieee80211_ptr;
 114         struct ieee80211_channel *chan = NULL;
 115
 116         /* call only for station! */
 117         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 118                 return -EINVAL;
 119
 120         if (wdev->valid_links)
 121                 return -EOPNOTSUPP;
 122
 123         if (wdev->links[0].client.current_bss)
 124                 chan = wdev->links[0].client.current_bss->pub.channel;
 125         else if (wdev->wext.connect.channel)
 126                 chan = wdev->wext.connect.channel;
 127
 128         if (chan) {
 129                 freq->m = chan->center_freq;
 130                 freq->e = 6;
 131                 return 0;
 132         }
 133
 134         /* no channel if not joining */
 135         return -EINVAL;
 136 }
 137
 138 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 139                                struct iw_request_info *info,
 140                                struct iw_point *data, char *ssid)
 141 {
 142         struct wireless_dev *wdev = dev->ieee80211_ptr;
 143         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 144         size_t len = data->length;
 145         int err;
 146
 147         /* call only for station! */
 148         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 149                 return -EINVAL;
 150
 151         if (!data->flags)
 152                 len = 0;
 153
 154         /* iwconfig uses nul termination in SSID.. */
 155         if (len > 0 && ssid[len - 1] == '\0')
 156                 len--;
 157
 158         if (wdev->conn) {
 159                 bool event = true;
 160
 161                 if (wdev->wext.connect.ssid && len &&
 162                     len == wdev->wext.connect.ssid_len &&
 163                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 164                         return 0;
 165
 166                 /* if SSID set now, we'll try to connect, avoid event */
 167                 if (len)
 168                         event = false;
 169                 err = cfg80211_disconnect(rdev, dev,
 170                                           WLAN_REASON_DEAUTH_LEAVING, event);
 171                 if (err)
 172                         return err;
 173         }
 174
 175         wdev->wext.prev_bssid_valid = false;
 176         wdev->wext.connect.ssid = wdev->wext.ssid;
 177         memcpy(wdev->wext.ssid, ssid, len);
 178         wdev->wext.connect.ssid_len = len;
 179
 180         wdev->wext.connect.crypto.control_port = false;
 181         wdev->wext.connect.crypto.control_port_ethertype =
 182                                         cpu_to_be16(ETH_P_PAE);
 183
 184         return cfg80211_mgd_wext_connect(rdev, wdev);
 185 }
 186
 187 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 188                                struct iw_request_info *info,
 189                                struct iw_point *data, char *ssid)
 190 {
 191         struct wireless_dev *wdev = dev->ieee80211_ptr;
 192         int ret = 0;
 193
 194         /* call only for station! */
 195         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 196                 return -EINVAL;
 197
 198         if (wdev->valid_links)
 199                 return -EINVAL;
 200
 201         data->flags = 0;
 202
 203         if (wdev->links[0].client.current_bss) {
 204                 const struct element *ssid_elem;
 205
 206                 rcu_read_lock();
 207                 ssid_elem = ieee80211_bss_get_elem(
 208                                 &wdev->links[0].client.current_bss->pub,
 209                                 WLAN_EID_SSID);
 210                 if (ssid_elem) {
 211                         data->flags = 1;
 212                         data->length = ssid_elem->datalen;
 213                         if (data->length > IW_ESSID_MAX_SIZE)
 214                                 ret = -EINVAL;
 215                         else
 216                                 memcpy(ssid, ssid_elem->data, data->length);
 217                 }
 218                 rcu_read_unlock();
 219         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 220                 data->flags = 1;
 221                 data->length = wdev->wext.connect.ssid_len;
 222                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 223         }
 224
 225         return ret;
 226 }
 227
 228 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 229                             struct iw_request_info *info,
 230                             struct sockaddr *ap_addr, char *extra)
 231 {
 232         struct wireless_dev *wdev = dev->ieee80211_ptr;
 233         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 234         u8 *bssid = ap_addr->sa_data;
 235         int err;
 236
 237         /* call only for station! */
 238         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 239                 return -EINVAL;
 240
 241         if (ap_addr->sa_family != ARPHRD_ETHER)
 242                 return -EINVAL;
 243
 244         /* automatic mode */
 245         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 246                 bssid = NULL;
 247
 248         if (wdev->conn) {
 249                 /* both automatic */
 250                 if (!bssid && !wdev->wext.connect.bssid)
 251                         return 0;
 252
 253                 /* fixed already - and no change */
 254                 if (wdev->wext.connect.bssid && bssid &&
 255                     ether_addr_equal(bssid, wdev->wext.connect.bssid))
 256                         return 0;
 257
 258                 err = cfg80211_disconnect(rdev, dev,
 259                                           WLAN_REASON_DEAUTH_LEAVING, false);
 260                 if (err)
 261                         return err;
 262         }
 263
 264         if (bssid) {
 265                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 266                 wdev->wext.connect.bssid = wdev->wext.bssid;
 267         } else
 268                 wdev->wext.connect.bssid = NULL;
 269
 270         return cfg80211_mgd_wext_connect(rdev, wdev);
 271 }
 272
 273 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 274                             struct iw_request_info *info,
 275                             struct sockaddr *ap_addr, char *extra)
 276 {
 277         struct wireless_dev *wdev = dev->ieee80211_ptr;
 278
 279         /* call only for station! */
 280         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 281                 return -EINVAL;
 282
 283         ap_addr->sa_family = ARPHRD_ETHER;
 284
 285         if (wdev->valid_links)
 286                 return -EOPNOTSUPP;
 287
 288         if (wdev->links[0].client.current_bss)
 289                 memcpy(ap_addr->sa_data,
 290                        wdev->links[0].client.current_bss->pub.bssid,
 291                        ETH_ALEN);
 292         else
 293                 eth_zero_addr(ap_addr->sa_data);
 294
 295         return 0;
 296 }
 297
 298 int cfg80211_wext_siwgenie(struct net_device *dev,
 299                            struct iw_request_info *info,
 300                            union iwreq_data *wrqu, char *extra)
 301 {
 302         struct iw_point *data = &wrqu->data;
 303         struct wireless_dev *wdev = dev->ieee80211_ptr;
 304         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 305         u8 *ie = extra;
 306         int ie_len = data->length, err;
 307
 308         if (wdev->iftype != NL80211_IFTYPE_STATION)
 309                 return -EOPNOTSUPP;
 310
 311         if (!ie_len)
 312                 ie = NULL;
 313
 314         wiphy_lock(wdev->wiphy);
 315
 316         /* no change */
 317         err = 0;
 318         if (wdev->wext.ie_len == ie_len &&
 319             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 320                 goto out;
 321
 322         if (ie_len) {
 323                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 324                 if (!ie) {
 325                         err = -ENOMEM;
 326                         goto out;
 327                 }
 328         } else
 329                 ie = NULL;
 330
 331         kfree(wdev->wext.ie);
 332         wdev->wext.ie = ie;
 333         wdev->wext.ie_len = ie_len;
 334
 335         if (wdev->conn) {
 336                 err = cfg80211_disconnect(rdev, dev,
 337                                           WLAN_REASON_DEAUTH_LEAVING, false);
 338                 if (err)
 339                         goto out;
 340         }
 341
 342         /* userspace better not think we'll reconnect */
 343         err = 0;
 344  out:
 345         wiphy_unlock(wdev->wiphy);
 346         return err;
 347 }
 348
 349 int cfg80211_wext_siwmlme(struct net_device *dev,
 350                           struct iw_request_info *info,
 351                           union iwreq_data *wrqu, char *extra)
 352 {
 353         struct wireless_dev *wdev = dev->ieee80211_ptr;
 354         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 355         struct cfg80211_registered_device *rdev;
 356         int err;
 357
 358         if (!wdev)
 359                 return -EOPNOTSUPP;
 360
 361         rdev = wiphy_to_rdev(wdev->wiphy);
 362
 363         if (wdev->iftype != NL80211_IFTYPE_STATION)
 364                 return -EINVAL;
 365
 366         if (mlme->addr.sa_family != ARPHRD_ETHER)
 367                 return -EINVAL;
 368
 369         wiphy_lock(&rdev->wiphy);
 370         switch (mlme->cmd) {
 371         case IW_MLME_DEAUTH:
 372         case IW_MLME_DISASSOC:
 373                 err = cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
 374                 break;
 375         default:
 376                 err = -EOPNOTSUPP;
 377                 break;
 378         }
 379         wiphy_unlock(&rdev->wiphy);
 380
 381         return err;
 382 }