SAFE public projects git trees. - safe/jmp/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 "nl80211.h"
  11
  12
  13 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, gfp_t gfp)
  14 {
  15         struct wireless_dev *wdev = dev->ieee80211_ptr;
  16         struct cfg80211_bss *bss;
  17 #ifdef CONFIG_WIRELESS_EXT
  18         union iwreq_data wrqu;
  19 #endif
  20
  21         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
  22                 return;
  23
  24         if (WARN_ON(!wdev->ssid_len))
  25                 return;
  26
  27         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
  28                                wdev->ssid, wdev->ssid_len,
  29                                WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS);
  30
  31         if (WARN_ON(!bss))
  32                 return;
  33
  34         if (wdev->current_bss) {
  35                 cfg80211_unhold_bss(wdev->current_bss);
  36                 cfg80211_put_bss(&wdev->current_bss->pub);
  37         }
  38
  39         cfg80211_hold_bss(bss_from_pub(bss));
  40         wdev->current_bss = bss_from_pub(bss);
  41
  42         nl80211_send_ibss_bssid(wiphy_to_dev(wdev->wiphy), dev, bssid, gfp);
  43 #ifdef CONFIG_WIRELESS_EXT
  44         memset(&wrqu, 0, sizeof(wrqu));
  45         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
  46         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
  47 #endif
  48 }
  49 EXPORT_SYMBOL(cfg80211_ibss_joined);
  50
  51 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
  52                        struct net_device *dev,
  53                        struct cfg80211_ibss_params *params)
  54 {
  55         struct wireless_dev *wdev = dev->ieee80211_ptr;
  56         int err;
  57
  58         if (wdev->ssid_len)
  59                 return -EALREADY;
  60
  61 #ifdef CONFIG_WIRELESS_EXT
  62         wdev->wext.ibss.channel = params->channel;
  63 #endif
  64         err = rdev->ops->join_ibss(&rdev->wiphy, dev, params);
  65
  66         if (err)
  67                 return err;
  68
  69         memcpy(wdev->ssid, params->ssid, params->ssid_len);
  70         wdev->ssid_len = params->ssid_len;
  71
  72         return 0;
  73 }
  74
  75 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
  76 {
  77         struct wireless_dev *wdev = dev->ieee80211_ptr;
  78
  79         if (wdev->current_bss) {
  80                 cfg80211_unhold_bss(wdev->current_bss);
  81                 cfg80211_put_bss(&wdev->current_bss->pub);
  82         }
  83
  84         wdev->current_bss = NULL;
  85         wdev->ssid_len = 0;
  86 #ifdef CONFIG_WIRELESS_EXT
  87         if (!nowext)
  88                 wdev->wext.ibss.ssid_len = 0;
  89 #endif
  90 }
  91
  92 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
  93                         struct net_device *dev, bool nowext)
  94 {
  95         struct wireless_dev *wdev = dev->ieee80211_ptr;
  96         int err;
  97
  98         if (!wdev->ssid_len)
  99                 return -ENOLINK;
 100
 101         err = rdev->ops->leave_ibss(&rdev->wiphy, dev);
 102
 103         if (err)
 104                 return err;
 105
 106         cfg80211_clear_ibss(dev, nowext);
 107
 108         return 0;
 109 }
 110
 111 #ifdef CONFIG_WIRELESS_EXT
 112 static int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 113                                    struct wireless_dev *wdev)
 114 {
 115         enum ieee80211_band band;
 116         int i;
 117
 118         if (!wdev->wext.ibss.beacon_interval)
 119                 wdev->wext.ibss.beacon_interval = 100;
 120
 121         /* try to find an IBSS channel if none requested ... */
 122         if (!wdev->wext.ibss.channel) {
 123                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 124                         struct ieee80211_supported_band *sband;
 125                         struct ieee80211_channel *chan;
 126
 127                         sband = rdev->wiphy.bands[band];
 128                         if (!sband)
 129                                 continue;
 130
 131                         for (i = 0; i < sband->n_channels; i++) {
 132                                 chan = &sband->channels[i];
 133                                 if (chan->flags & IEEE80211_CHAN_NO_IBSS)
 134                                         continue;
 135                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 136                                         continue;
 137                                 wdev->wext.ibss.channel = chan;
 138                                 break;
 139                         }
 140
 141                         if (wdev->wext.ibss.channel)
 142                                 break;
 143                 }
 144
 145                 if (!wdev->wext.ibss.channel)
 146                         return -EINVAL;
 147         }
 148
 149         /* don't join -- SSID is not there */
 150         if (!wdev->wext.ibss.ssid_len)
 151                 return 0;
 152
 153         if (!netif_running(wdev->netdev))
 154                 return 0;
 155
 156         return cfg80211_join_ibss(wiphy_to_dev(wdev->wiphy),
 157                                   wdev->netdev, &wdev->wext.ibss);
 158 }
 159
 160 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 161                                struct iw_request_info *info,
 162                                struct iw_freq *freq, char *extra)
 163 {
 164         struct wireless_dev *wdev = dev->ieee80211_ptr;
 165         struct ieee80211_channel *chan;
 166         int err;
 167
 168         /* call only for ibss! */
 169         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 170                 return -EINVAL;
 171
 172         if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
 173                 return -EOPNOTSUPP;
 174
 175         chan = cfg80211_wext_freq(wdev->wiphy, freq);
 176         if (chan && IS_ERR(chan))
 177                 return PTR_ERR(chan);
 178
 179         if (chan &&
 180             (chan->flags & IEEE80211_CHAN_NO_IBSS ||
 181              chan->flags & IEEE80211_CHAN_DISABLED))
 182                 return -EINVAL;
 183
 184         if (wdev->wext.ibss.channel == chan)
 185                 return 0;
 186
 187         if (wdev->ssid_len) {
 188                 err = cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy),
 189                                           dev, true);
 190                 if (err)
 191                         return err;
 192         }
 193
 194         if (chan) {
 195                 wdev->wext.ibss.channel = chan;
 196                 wdev->wext.ibss.channel_fixed = true;
 197         } else {
 198                 /* cfg80211_ibss_wext_join will pick one if needed */
 199                 wdev->wext.ibss.channel_fixed = false;
 200         }
 201
 202         return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
 203 }
 204 /* temporary symbol - mark GPL - in the future the handler won't be */
 205 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwfreq);
 206
 207 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 208                                struct iw_request_info *info,
 209                                struct iw_freq *freq, char *extra)
 210 {
 211         struct wireless_dev *wdev = dev->ieee80211_ptr;
 212         struct ieee80211_channel *chan = NULL;
 213
 214         /* call only for ibss! */
 215         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 216                 return -EINVAL;
 217
 218         if (wdev->current_bss)
 219                 chan = wdev->current_bss->pub.channel;
 220         else if (wdev->wext.ibss.channel)
 221                 chan = wdev->wext.ibss.channel;
 222
 223         if (chan) {
 224                 freq->m = chan->center_freq;
 225                 freq->e = 6;
 226                 return 0;
 227         }
 228
 229         /* no channel if not joining */
 230         return -EINVAL;
 231 }
 232 /* temporary symbol - mark GPL - in the future the handler won't be */
 233 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwfreq);
 234
 235 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 236                                 struct iw_request_info *info,
 237                                 struct iw_point *data, char *ssid)
 238 {
 239         struct wireless_dev *wdev = dev->ieee80211_ptr;
 240         size_t len = data->length;
 241         int err;
 242
 243         /* call only for ibss! */
 244         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 245                 return -EINVAL;
 246
 247         if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
 248                 return -EOPNOTSUPP;
 249
 250         if (wdev->ssid_len) {
 251                 err = cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy),
 252                                           dev, true);
 253                 if (err)
 254                         return err;
 255         }
 256
 257         /* iwconfig uses nul termination in SSID.. */
 258         if (len > 0 && ssid[len - 1] == '\0')
 259                 len--;
 260
 261         wdev->wext.ibss.ssid = wdev->ssid;
 262         memcpy(wdev->wext.ibss.ssid, ssid, len);
 263         wdev->wext.ibss.ssid_len = len;
 264
 265         return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
 266 }
 267 /* temporary symbol - mark GPL - in the future the handler won't be */
 268 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwessid);
 269
 270 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 271                                 struct iw_request_info *info,
 272                                 struct iw_point *data, char *ssid)
 273 {
 274         struct wireless_dev *wdev = dev->ieee80211_ptr;
 275
 276         /* call only for ibss! */
 277         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 278                 return -EINVAL;
 279
 280         data->flags = 0;
 281
 282         if (wdev->ssid_len) {
 283                 data->flags = 1;
 284                 data->length = wdev->ssid_len;
 285                 memcpy(ssid, wdev->ssid, data->length);
 286         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 287                 data->flags = 1;
 288                 data->length = wdev->wext.ibss.ssid_len;
 289                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 290         }
 291
 292         return 0;
 293 }
 294 /* temporary symbol - mark GPL - in the future the handler won't be */
 295 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwessid);
 296
 297 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 298                              struct iw_request_info *info,
 299                              struct sockaddr *ap_addr, char *extra)
 300 {
 301         struct wireless_dev *wdev = dev->ieee80211_ptr;
 302         u8 *bssid = ap_addr->sa_data;
 303         int err;
 304
 305         /* call only for ibss! */
 306         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 307                 return -EINVAL;
 308
 309         if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
 310                 return -EOPNOTSUPP;
 311
 312         if (ap_addr->sa_family != ARPHRD_ETHER)
 313                 return -EINVAL;
 314
 315         /* automatic mode */
 316         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 317                 bssid = NULL;
 318
 319         /* both automatic */
 320         if (!bssid && !wdev->wext.ibss.bssid)
 321                 return 0;
 322
 323         /* fixed already - and no change */
 324         if (wdev->wext.ibss.bssid && bssid &&
 325             compare_ether_addr(bssid, wdev->wext.ibss.bssid) == 0)
 326                 return 0;
 327
 328         if (wdev->ssid_len) {
 329                 err = cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy),
 330                                           dev, true);
 331                 if (err)
 332                         return err;
 333         }
 334
 335         if (bssid) {
 336                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 337                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 338         } else
 339                 wdev->wext.ibss.bssid = NULL;
 340
 341         return cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
 342 }
 343 /* temporary symbol - mark GPL - in the future the handler won't be */
 344 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_siwap);
 345
 346 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 347                              struct iw_request_info *info,
 348                              struct sockaddr *ap_addr, char *extra)
 349 {
 350         struct wireless_dev *wdev = dev->ieee80211_ptr;
 351
 352         /* call only for ibss! */
 353         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 354                 return -EINVAL;
 355
 356         ap_addr->sa_family = ARPHRD_ETHER;
 357
 358         if (wdev->current_bss)
 359                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 360         else
 361                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 362         return 0;
 363 }
 364 /* temporary symbol - mark GPL - in the future the handler won't be */
 365 EXPORT_SYMBOL_GPL(cfg80211_ibss_wext_giwap);
 366 #endif