git.oblomov.eu Git - linux-2.6/blob - net/wireless/ibss.c

   1 /*
   2  * Some IBSS support code for cfg80211.
   3  *
   4  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   5  */
   6
   7 #include <linux/etherdevice.h>
   8 #include <linux/if_arp.h>
   9 #include <net/cfg80211.h>
  10 #include <net/wireless.h>
  11 #include "nl80211.h"
  12
  13
  14 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, gfp_t gfp)
  15 {
  16         struct wireless_dev *wdev = dev->ieee80211_ptr;
  17         struct cfg80211_bss *bss;
  18 #ifdef CONFIG_WIRELESS_EXT
  19         union iwreq_data wrqu;
  20 #endif
  21
  22         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
  23                 return;
  24
  25         if (WARN_ON(!wdev->ssid_len))
  26                 return;
  27
  28         if (memcmp(bssid, wdev->bssid, ETH_ALEN) == 0)
  29                 return;
  30
  31         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
  32                                wdev->ssid, wdev->ssid_len,
  33                                WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS);
  34
  35         if (WARN_ON(!bss))
  36                 return;
  37
  38         if (wdev->current_bss) {
  39                 cfg80211_unhold_bss(wdev->current_bss);
  40                 cfg80211_put_bss(wdev->current_bss);
  41         }
  42
  43         cfg80211_hold_bss(bss);
  44         wdev->current_bss = bss;
  45         memcpy(wdev->bssid, bssid, ETH_ALEN);
  46
  47         nl80211_send_ibss_bssid(wiphy_to_dev(wdev->wiphy), dev, bssid, gfp);
  48 #ifdef CONFIG_WIRELESS_EXT
  49         memset(&wrqu, 0, sizeof(wrqu));
  50         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
  51         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
  52 #endif
  53 }
  54 EXPORT_SYMBOL(cfg80211_ibss_joined);
  55
  56 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
  57                        struct net_device *dev,
  58                        struct cfg80211_ibss_params *params)
  59 {
  60         struct wireless_dev *wdev = dev->ieee80211_ptr;
  61         int err;
  62
  63         if (wdev->ssid_len)
  64                 return -EALREADY;
  65
  66 #ifdef CONFIG_WIRELESS_EXT
  67         wdev->wext.channel = params->channel;
  68 #endif
  69         err = rdev->ops->join_ibss(&rdev->wiphy, dev, params);
  70
  71         if (err)
  72                 return err;
  73
  74         memcpy(wdev->ssid, params->ssid, params->ssid_len);
  75         wdev->ssid_len = params->ssid_len;
  76
  77         return 0;
  78 }
  79
  80 void cfg80211_clear_ibss(struct net_device *dev)
  81 {
  82         struct wireless_dev *wdev = dev->ieee80211_ptr;
  83
  84         if (wdev->current_bss) {
  85                 cfg80211_unhold_bss(wdev->current_bss);
  86                 cfg80211_put_bss(wdev->current_bss);
  87         }
  88
  89         wdev->current_bss = NULL;
  90         wdev->ssid_len = 0;
  91         memset(wdev->bssid, 0, ETH_ALEN);
  92 }
  93
  94 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
  95                         struct net_device *dev)
  96 {
  97         int err;
  98
  99         err = rdev->ops->leave_ibss(&rdev->wiphy, dev);
 100
 101         if (err)
 102                 return err;
 103
 104         cfg80211_clear_ibss(dev);
 105
 106         return 0;
 107 }
 108
 109 #ifdef CONFIG_WIRELESS_EXT
 110 static int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 111                                    struct wireless_dev *wdev)
 112 {
 113         enum ieee80211_band band;
 114         int i;
 115
 116         /* try to find an IBSS channel if none requested ... */
 117         if (!wdev->wext.channel) {
 118                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 119                         struct ieee80211_supported_band *sband;
 120                         struct ieee80211_channel *chan;
 121
 122                         sband = rdev->wiphy.bands[band];
 123                         if (!sband)
 124                                 continue;
 125
 126                         for (i = 0; i < sband->n_channels; i++) {
 127                                 chan = &sband->channels[i];
 128                                 if (chan->flags & IEEE80211_CHAN_NO_IBSS)
 129                                         continue;
 130                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 131                                         continue;
 132                                 wdev->wext.channel = chan;
 133                                 break;
 134                         }
 135
 136                         if (wdev->wext.channel)
 137                                 break;
 138                 }
 139
 140                 if (!wdev->wext.channel)
 141                         return -EINVAL;
 142         }
 143
 144         /* don't join -- SSID is not there */
 145         if (!wdev->wext.ssid_len)
 146                 return 0;
 147
 148         if (!netif_running(wdev->netdev))
 149                 return 0;
 150
 151         return cfg80211_join_ibss(wiphy_to_dev(wdev->wiphy),
 152                                   wdev->netdev, &wdev->wext);
 153 }
 154
 155 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 156                                struct iw_request_info *info,
 157                                struct iw_freq *freq, char *extra)
 158 {
 159         struct wireless_dev *wdev = dev->ieee80211_ptr;
 160         struct ieee80211_channel *chan;
 161         int err;
 162
 163         /* call only for ibss! */
 164         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 165                 return -EINVAL;
 166
 167         if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
 168                 return -EOPNOTSUPP;
 169
 170         chan = cfg80211_wext_freq(wdev->wiphy, freq);
 171         if (chan && IS_ERR(chan))
 172                 return PTR_ERR(chan);
 173
 174         if (chan &&
 175             (chan->flags & IEEE80211_CHAN_NO_IBSS ||
 176              chan->flags & IEEE80211_CHAN_DISABLED))
 177                 return -EINVAL;
 178
 179         if (wdev->wext.channel == chan)
 180                 return 0;
 181
 182         if (wdev->ssid_len) {
 183                 err = cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy), dev);
 184                 if (err)
 185                         return err;
 186         }
 187
 188         if (chan) {
 189                 wdev->wext.channel = chan;
 190                 wdev->wext.channel_fixed = true;
 191         } else {
 192                 /* cfg80211_ibss_wext_join will pick one if needed */
 193                 wdev->wext.channel_fixed = false;
 194         }
 195
 196         return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
 197 }
 198 /* temporary symbol - mark GPL - in the future the handler won't be */
 199 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwfreq);
 200
 201 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 202                                struct iw_request_info *info,
 203                                struct iw_freq *freq, char *extra)
 204 {
 205         struct wireless_dev *wdev = dev->ieee80211_ptr;
 206         struct ieee80211_channel *chan = NULL;
 207
 208         /* call only for ibss! */
 209         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 210                 return -EINVAL;
 211
 212         if (wdev->current_bss)
 213                 chan = wdev->current_bss->channel;
 214         else if (wdev->wext.channel)
 215                 chan = wdev->wext.channel;
 216
 217         if (chan) {
 218                 freq->m = chan->center_freq;
 219                 freq->e = 6;
 220                 return 0;
 221         }
 222
 223         /* no channel if not joining */
 224         return -EINVAL;
 225 }
 226 /* temporary symbol - mark GPL - in the future the handler won't be */
 227 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwfreq);
 228
 229 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 230                                 struct iw_request_info *info,
 231                                 struct iw_point *data, char *ssid)
 232 {
 233         struct wireless_dev *wdev = dev->ieee80211_ptr;
 234         size_t len = data->length;
 235         int err;
 236
 237         /* call only for ibss! */
 238         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 239                 return -EINVAL;
 240
 241         if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
 242                 return -EOPNOTSUPP;
 243
 244         if (wdev->ssid_len) {
 245                 err = cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy), dev);
 246                 if (err)
 247                         return err;
 248         }
 249
 250         /* iwconfig uses nul termination in SSID.. */
 251         if (len > 0 && ssid[len - 1] == '\0')
 252                 len--;
 253
 254         wdev->wext.ssid = wdev->ssid;
 255         memcpy(wdev->wext.ssid, ssid, len);
 256         wdev->wext.ssid_len = len;
 257
 258         return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
 259 }
 260 /* temporary symbol - mark GPL - in the future the handler won't be */
 261 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwessid);
 262
 263 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 264                                 struct iw_request_info *info,
 265                                 struct iw_point *data, char *ssid)
 266 {
 267         struct wireless_dev *wdev = dev->ieee80211_ptr;
 268
 269         /* call only for ibss! */
 270         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 271                 return -EINVAL;
 272
 273         data->flags = 0;
 274
 275         if (wdev->ssid_len) {
 276                 data->flags = 1;
 277                 data->length = wdev->ssid_len;
 278                 memcpy(ssid, wdev->ssid, data->length);
 279         } else if (wdev->wext.ssid) {
 280                 data->flags = 1;
 281                 data->length = wdev->wext.ssid_len;
 282                 memcpy(ssid, wdev->wext.ssid, data->length);
 283         }
 284
 285         return 0;
 286 }
 287 /* temporary symbol - mark GPL - in the future the handler won't be */
 288 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwessid);
 289
 290 int cfg80211_ibss_wext_siwap(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         u8 *bssid = ap_addr->sa_data;
 296         int err;
 297
 298         /* call only for ibss! */
 299         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 300                 return -EINVAL;
 301
 302         if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
 303                 return -EOPNOTSUPP;
 304
 305         if (ap_addr->sa_family != ARPHRD_ETHER)
 306                 return -EINVAL;
 307
 308         /* automatic mode */
 309         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 310                 bssid = NULL;
 311
 312         /* both automatic */
 313         if (!bssid && !wdev->wext.bssid)
 314                 return 0;
 315
 316         /* fixed already - and no change */
 317         if (wdev->wext.bssid && bssid &&
 318             compare_ether_addr(bssid, wdev->wext.bssid) == 0)
 319                 return 0;
 320
 321         if (wdev->ssid_len) {
 322                 err = cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy), dev);
 323                 if (err)
 324                         return err;
 325         }
 326
 327         if (bssid) {
 328                 memcpy(wdev->wext_bssid, bssid, ETH_ALEN);
 329                 wdev->wext.bssid = wdev->wext_bssid;
 330         } else
 331                 wdev->wext.bssid = NULL;
 332
 333         return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
 334 }
 335 /* temporary symbol - mark GPL - in the future the handler won't be */
 336 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwap);
 337
 338 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 339                              struct iw_request_info *info,
 340                              struct sockaddr *ap_addr, char *extra)
 341 {
 342         struct wireless_dev *wdev = dev->ieee80211_ptr;
 343
 344         /* call only for ibss! */
 345         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 346                 return -EINVAL;
 347
 348         ap_addr->sa_family = ARPHRD_ETHER;
 349
 350         if (wdev->wext.bssid) {
 351                 memcpy(ap_addr->sa_data, wdev->wext.bssid, ETH_ALEN);
 352                 return 0;
 353         }
 354
 355         memcpy(ap_addr->sa_data, wdev->bssid, ETH_ALEN);
 356         return 0;
 357 }
 358 /* temporary symbol - mark GPL - in the future the handler won't be */
 359 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwap);
 360 #endif