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 <linux/slab.h> 10 #include <linux/export.h> 11 #include <net/cfg80211.h> 12 #include "wext-compat.h" 13 #include "nl80211.h" 14 #include "rdev-ops.h" 15 16 17 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, 18 struct ieee80211_channel *channel) 19 { 20 struct wireless_dev *wdev = dev->ieee80211_ptr; 21 struct cfg80211_bss *bss; 22 #ifdef CONFIG_CFG80211_WEXT 23 union iwreq_data wrqu; 24 #endif 25 26 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 27 return; 28 29 if (!wdev->ssid_len) 30 return; 31 32 bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, NULL, 0, 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->wiphy, &wdev->current_bss->pub); 41 } 42 43 cfg80211_hold_bss(bss_from_pub(bss)); 44 wdev->current_bss = bss_from_pub(bss); 45 46 cfg80211_upload_connect_keys(wdev); 47 48 nl80211_send_ibss_bssid(wiphy_to_rdev(wdev->wiphy), dev, bssid, 49 GFP_KERNEL); 50 #ifdef CONFIG_CFG80211_WEXT 51 memset(&wrqu, 0, sizeof(wrqu)); 52 memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN); 53 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL); 54 #endif 55 } 56 57 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, 58 struct ieee80211_channel *channel, gfp_t gfp) 59 { 60 struct wireless_dev *wdev = dev->ieee80211_ptr; 61 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 62 struct cfg80211_event *ev; 63 unsigned long flags; 64 65 trace_cfg80211_ibss_joined(dev, bssid, channel); 66 67 if (WARN_ON(!channel)) 68 return; 69 70 ev = kzalloc(sizeof(*ev), gfp); 71 if (!ev) 72 return; 73 74 ev->type = EVENT_IBSS_JOINED; 75 memcpy(ev->ij.bssid, bssid, ETH_ALEN); 76 ev->ij.channel = channel; 77 78 spin_lock_irqsave(&wdev->event_lock, flags); 79 list_add_tail(&ev->list, &wdev->event_list); 80 spin_unlock_irqrestore(&wdev->event_lock, flags); 81 queue_work(cfg80211_wq, &rdev->event_work); 82 } 83 EXPORT_SYMBOL(cfg80211_ibss_joined); 84 85 static int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev, 86 struct net_device *dev, 87 struct cfg80211_ibss_params *params, 88 struct cfg80211_cached_keys *connkeys) 89 { 90 struct wireless_dev *wdev = dev->ieee80211_ptr; 91 int err; 92 93 ASSERT_WDEV_LOCK(wdev); 94 95 if (wdev->ssid_len) 96 return -EALREADY; 97 98 if (!params->basic_rates) { 99 /* 100 * If no rates were explicitly configured, 101 * use the mandatory rate set for 11b or 102 * 11a for maximum compatibility. 103 */ 104 struct ieee80211_supported_band *sband = 105 rdev->wiphy.bands[params->chandef.chan->band]; 106 int j; 107 u32 flag = params->chandef.chan->band == IEEE80211_BAND_5GHZ ? 108 IEEE80211_RATE_MANDATORY_A : 109 IEEE80211_RATE_MANDATORY_B; 110 111 for (j = 0; j < sband->n_bitrates; j++) { 112 if (sband->bitrates[j].flags & flag) 113 params->basic_rates |= BIT(j); 114 } 115 } 116 117 if (WARN_ON(wdev->connect_keys)) 118 kfree(wdev->connect_keys); 119 wdev->connect_keys = connkeys; 120 121 wdev->ibss_fixed = params->channel_fixed; 122 wdev->ibss_dfs_possible = params->userspace_handles_dfs; 123 wdev->chandef = params->chandef; 124 #ifdef CONFIG_CFG80211_WEXT 125 wdev->wext.ibss.chandef = params->chandef; 126 #endif 127 err = rdev_join_ibss(rdev, dev, params); 128 if (err) { 129 wdev->connect_keys = NULL; 130 return err; 131 } 132 133 memcpy(wdev->ssid, params->ssid, params->ssid_len); 134 wdev->ssid_len = params->ssid_len; 135 136 return 0; 137 } 138 139 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev, 140 struct net_device *dev, 141 struct cfg80211_ibss_params *params, 142 struct cfg80211_cached_keys *connkeys) 143 { 144 struct wireless_dev *wdev = dev->ieee80211_ptr; 145 int err; 146 147 ASSERT_RTNL(); 148 149 wdev_lock(wdev); 150 err = __cfg80211_join_ibss(rdev, dev, params, connkeys); 151 wdev_unlock(wdev); 152 153 return err; 154 } 155 156 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext) 157 { 158 struct wireless_dev *wdev = dev->ieee80211_ptr; 159 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 160 int i; 161 162 ASSERT_WDEV_LOCK(wdev); 163 164 kfree(wdev->connect_keys); 165 wdev->connect_keys = NULL; 166 167 rdev_set_qos_map(rdev, dev, NULL); 168 169 /* 170 * Delete all the keys ... pairwise keys can't really 171 * exist any more anyway, but default keys might. 172 */ 173 if (rdev->ops->del_key) 174 for (i = 0; i < 6; i++) 175 rdev_del_key(rdev, dev, i, false, NULL); 176 177 if (wdev->current_bss) { 178 cfg80211_unhold_bss(wdev->current_bss); 179 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 180 } 181 182 wdev->current_bss = NULL; 183 wdev->ssid_len = 0; 184 memset(&wdev->chandef, 0, sizeof(wdev->chandef)); 185 #ifdef CONFIG_CFG80211_WEXT 186 if (!nowext) 187 wdev->wext.ibss.ssid_len = 0; 188 #endif 189 } 190 191 void cfg80211_clear_ibss(struct net_device *dev, bool nowext) 192 { 193 struct wireless_dev *wdev = dev->ieee80211_ptr; 194 195 wdev_lock(wdev); 196 __cfg80211_clear_ibss(dev, nowext); 197 wdev_unlock(wdev); 198 } 199 200 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev, 201 struct net_device *dev, bool nowext) 202 { 203 struct wireless_dev *wdev = dev->ieee80211_ptr; 204 int err; 205 206 ASSERT_WDEV_LOCK(wdev); 207 208 if (!wdev->ssid_len) 209 return -ENOLINK; 210 211 err = rdev_leave_ibss(rdev, dev); 212 213 if (err) 214 return err; 215 216 __cfg80211_clear_ibss(dev, nowext); 217 218 return 0; 219 } 220 221 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev, 222 struct net_device *dev, bool nowext) 223 { 224 struct wireless_dev *wdev = dev->ieee80211_ptr; 225 int err; 226 227 wdev_lock(wdev); 228 err = __cfg80211_leave_ibss(rdev, dev, nowext); 229 wdev_unlock(wdev); 230 231 return err; 232 } 233 234 #ifdef CONFIG_CFG80211_WEXT 235 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev, 236 struct wireless_dev *wdev) 237 { 238 struct cfg80211_cached_keys *ck = NULL; 239 enum ieee80211_band band; 240 int i, err; 241 242 ASSERT_WDEV_LOCK(wdev); 243 244 if (!wdev->wext.ibss.beacon_interval) 245 wdev->wext.ibss.beacon_interval = 100; 246 247 /* try to find an IBSS channel if none requested ... */ 248 if (!wdev->wext.ibss.chandef.chan) { 249 struct ieee80211_channel *new_chan = NULL; 250 251 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 252 struct ieee80211_supported_band *sband; 253 struct ieee80211_channel *chan; 254 255 sband = rdev->wiphy.bands[band]; 256 if (!sband) 257 continue; 258 259 for (i = 0; i < sband->n_channels; i++) { 260 chan = &sband->channels[i]; 261 if (chan->flags & IEEE80211_CHAN_NO_IR) 262 continue; 263 if (chan->flags & IEEE80211_CHAN_DISABLED) 264 continue; 265 new_chan = chan; 266 break; 267 } 268 269 if (new_chan) 270 break; 271 } 272 273 if (!new_chan) 274 return -EINVAL; 275 276 cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan, 277 NL80211_CHAN_NO_HT); 278 } 279 280 /* don't join -- SSID is not there */ 281 if (!wdev->wext.ibss.ssid_len) 282 return 0; 283 284 if (!netif_running(wdev->netdev)) 285 return 0; 286 287 if (wdev->wext.keys) { 288 wdev->wext.keys->def = wdev->wext.default_key; 289 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key; 290 } 291 292 wdev->wext.ibss.privacy = wdev->wext.default_key != -1; 293 294 if (wdev->wext.keys) { 295 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL); 296 if (!ck) 297 return -ENOMEM; 298 for (i = 0; i < 6; i++) 299 ck->params[i].key = ck->data[i]; 300 } 301 err = __cfg80211_join_ibss(rdev, wdev->netdev, 302 &wdev->wext.ibss, ck); 303 if (err) 304 kfree(ck); 305 306 return err; 307 } 308 309 int cfg80211_ibss_wext_siwfreq(struct net_device *dev, 310 struct iw_request_info *info, 311 struct iw_freq *wextfreq, char *extra) 312 { 313 struct wireless_dev *wdev = dev->ieee80211_ptr; 314 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 315 struct ieee80211_channel *chan = NULL; 316 int err, freq; 317 318 /* call only for ibss! */ 319 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 320 return -EINVAL; 321 322 if (!rdev->ops->join_ibss) 323 return -EOPNOTSUPP; 324 325 freq = cfg80211_wext_freq(wextfreq); 326 if (freq < 0) 327 return freq; 328 329 if (freq) { 330 chan = ieee80211_get_channel(wdev->wiphy, freq); 331 if (!chan) 332 return -EINVAL; 333 if (chan->flags & IEEE80211_CHAN_NO_IR || 334 chan->flags & IEEE80211_CHAN_DISABLED) 335 return -EINVAL; 336 } 337 338 if (wdev->wext.ibss.chandef.chan == chan) 339 return 0; 340 341 wdev_lock(wdev); 342 err = 0; 343 if (wdev->ssid_len) 344 err = __cfg80211_leave_ibss(rdev, dev, true); 345 wdev_unlock(wdev); 346 347 if (err) 348 return err; 349 350 if (chan) { 351 cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan, 352 NL80211_CHAN_NO_HT); 353 wdev->wext.ibss.channel_fixed = true; 354 } else { 355 /* cfg80211_ibss_wext_join will pick one if needed */ 356 wdev->wext.ibss.channel_fixed = false; 357 } 358 359 wdev_lock(wdev); 360 err = cfg80211_ibss_wext_join(rdev, wdev); 361 wdev_unlock(wdev); 362 363 return err; 364 } 365 366 int cfg80211_ibss_wext_giwfreq(struct net_device *dev, 367 struct iw_request_info *info, 368 struct iw_freq *freq, char *extra) 369 { 370 struct wireless_dev *wdev = dev->ieee80211_ptr; 371 struct ieee80211_channel *chan = NULL; 372 373 /* call only for ibss! */ 374 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 375 return -EINVAL; 376 377 wdev_lock(wdev); 378 if (wdev->current_bss) 379 chan = wdev->current_bss->pub.channel; 380 else if (wdev->wext.ibss.chandef.chan) 381 chan = wdev->wext.ibss.chandef.chan; 382 wdev_unlock(wdev); 383 384 if (chan) { 385 freq->m = chan->center_freq; 386 freq->e = 6; 387 return 0; 388 } 389 390 /* no channel if not joining */ 391 return -EINVAL; 392 } 393 394 int cfg80211_ibss_wext_siwessid(struct net_device *dev, 395 struct iw_request_info *info, 396 struct iw_point *data, char *ssid) 397 { 398 struct wireless_dev *wdev = dev->ieee80211_ptr; 399 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 400 size_t len = data->length; 401 int err; 402 403 /* call only for ibss! */ 404 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 405 return -EINVAL; 406 407 if (!rdev->ops->join_ibss) 408 return -EOPNOTSUPP; 409 410 wdev_lock(wdev); 411 err = 0; 412 if (wdev->ssid_len) 413 err = __cfg80211_leave_ibss(rdev, dev, true); 414 wdev_unlock(wdev); 415 416 if (err) 417 return err; 418 419 /* iwconfig uses nul termination in SSID.. */ 420 if (len > 0 && ssid[len - 1] == '\0') 421 len--; 422 423 memcpy(wdev->ssid, ssid, len); 424 wdev->wext.ibss.ssid = wdev->ssid; 425 wdev->wext.ibss.ssid_len = len; 426 427 wdev_lock(wdev); 428 err = cfg80211_ibss_wext_join(rdev, wdev); 429 wdev_unlock(wdev); 430 431 return err; 432 } 433 434 int cfg80211_ibss_wext_giwessid(struct net_device *dev, 435 struct iw_request_info *info, 436 struct iw_point *data, char *ssid) 437 { 438 struct wireless_dev *wdev = dev->ieee80211_ptr; 439 440 /* call only for ibss! */ 441 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 442 return -EINVAL; 443 444 data->flags = 0; 445 446 wdev_lock(wdev); 447 if (wdev->ssid_len) { 448 data->flags = 1; 449 data->length = wdev->ssid_len; 450 memcpy(ssid, wdev->ssid, data->length); 451 } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) { 452 data->flags = 1; 453 data->length = wdev->wext.ibss.ssid_len; 454 memcpy(ssid, wdev->wext.ibss.ssid, data->length); 455 } 456 wdev_unlock(wdev); 457 458 return 0; 459 } 460 461 int cfg80211_ibss_wext_siwap(struct net_device *dev, 462 struct iw_request_info *info, 463 struct sockaddr *ap_addr, char *extra) 464 { 465 struct wireless_dev *wdev = dev->ieee80211_ptr; 466 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 467 u8 *bssid = ap_addr->sa_data; 468 int err; 469 470 /* call only for ibss! */ 471 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 472 return -EINVAL; 473 474 if (!rdev->ops->join_ibss) 475 return -EOPNOTSUPP; 476 477 if (ap_addr->sa_family != ARPHRD_ETHER) 478 return -EINVAL; 479 480 /* automatic mode */ 481 if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid)) 482 bssid = NULL; 483 484 if (bssid && !is_valid_ether_addr(bssid)) 485 return -EINVAL; 486 487 /* both automatic */ 488 if (!bssid && !wdev->wext.ibss.bssid) 489 return 0; 490 491 /* fixed already - and no change */ 492 if (wdev->wext.ibss.bssid && bssid && 493 ether_addr_equal(bssid, wdev->wext.ibss.bssid)) 494 return 0; 495 496 wdev_lock(wdev); 497 err = 0; 498 if (wdev->ssid_len) 499 err = __cfg80211_leave_ibss(rdev, dev, true); 500 wdev_unlock(wdev); 501 502 if (err) 503 return err; 504 505 if (bssid) { 506 memcpy(wdev->wext.bssid, bssid, ETH_ALEN); 507 wdev->wext.ibss.bssid = wdev->wext.bssid; 508 } else 509 wdev->wext.ibss.bssid = NULL; 510 511 wdev_lock(wdev); 512 err = cfg80211_ibss_wext_join(rdev, wdev); 513 wdev_unlock(wdev); 514 515 return err; 516 } 517 518 int cfg80211_ibss_wext_giwap(struct net_device *dev, 519 struct iw_request_info *info, 520 struct sockaddr *ap_addr, char *extra) 521 { 522 struct wireless_dev *wdev = dev->ieee80211_ptr; 523 524 /* call only for ibss! */ 525 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 526 return -EINVAL; 527 528 ap_addr->sa_family = ARPHRD_ETHER; 529 530 wdev_lock(wdev); 531 if (wdev->current_bss) 532 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN); 533 else if (wdev->wext.ibss.bssid) 534 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN); 535 else 536 memset(ap_addr->sa_data, 0, ETH_ALEN); 537 538 wdev_unlock(wdev); 539 540 return 0; 541 } 542 #endif 543