1 /* 2 * SME code for cfg80211's connect emulation. 3 * 4 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> 5 * Copyright (C) 2009 Intel Corporation. All rights reserved. 6 */ 7 8 #include <linux/etherdevice.h> 9 #include <linux/if_arp.h> 10 #include <linux/slab.h> 11 #include <linux/workqueue.h> 12 #include <linux/wireless.h> 13 #include <linux/export.h> 14 #include <net/iw_handler.h> 15 #include <net/cfg80211.h> 16 #include <net/rtnetlink.h> 17 #include "nl80211.h" 18 #include "reg.h" 19 #include "rdev-ops.h" 20 21 struct cfg80211_conn { 22 struct cfg80211_connect_params params; 23 /* these are sub-states of the _CONNECTING sme_state */ 24 enum { 25 CFG80211_CONN_IDLE, 26 CFG80211_CONN_SCANNING, 27 CFG80211_CONN_SCAN_AGAIN, 28 CFG80211_CONN_AUTHENTICATE_NEXT, 29 CFG80211_CONN_AUTHENTICATING, 30 CFG80211_CONN_ASSOCIATE_NEXT, 31 CFG80211_CONN_ASSOCIATING, 32 CFG80211_CONN_DEAUTH_ASSOC_FAIL, 33 } state; 34 u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN]; 35 u8 *ie; 36 size_t ie_len; 37 bool auto_auth, prev_bssid_valid; 38 }; 39 40 static bool cfg80211_is_all_idle(void) 41 { 42 struct cfg80211_registered_device *rdev; 43 struct wireless_dev *wdev; 44 bool is_all_idle = true; 45 46 mutex_lock(&cfg80211_mutex); 47 48 /* 49 * All devices must be idle as otherwise if you are actively 50 * scanning some new beacon hints could be learned and would 51 * count as new regulatory hints. 52 */ 53 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 54 cfg80211_lock_rdev(rdev); 55 list_for_each_entry(wdev, &rdev->wdev_list, list) { 56 wdev_lock(wdev); 57 if (wdev->sme_state != CFG80211_SME_IDLE) 58 is_all_idle = false; 59 wdev_unlock(wdev); 60 } 61 cfg80211_unlock_rdev(rdev); 62 } 63 64 mutex_unlock(&cfg80211_mutex); 65 66 return is_all_idle; 67 } 68 69 static void disconnect_work(struct work_struct *work) 70 { 71 if (!cfg80211_is_all_idle()) 72 return; 73 74 regulatory_hint_disconnect(); 75 } 76 77 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work); 78 79 static int cfg80211_conn_scan(struct wireless_dev *wdev) 80 { 81 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 82 struct cfg80211_scan_request *request; 83 int n_channels, err; 84 85 ASSERT_RTNL(); 86 ASSERT_RDEV_LOCK(rdev); 87 ASSERT_WDEV_LOCK(wdev); 88 lockdep_assert_held(&rdev->sched_scan_mtx); 89 90 if (rdev->scan_req) 91 return -EBUSY; 92 93 if (wdev->conn->params.channel) { 94 n_channels = 1; 95 } else { 96 enum ieee80211_band band; 97 n_channels = 0; 98 99 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 100 if (!wdev->wiphy->bands[band]) 101 continue; 102 n_channels += wdev->wiphy->bands[band]->n_channels; 103 } 104 } 105 request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) + 106 sizeof(request->channels[0]) * n_channels, 107 GFP_KERNEL); 108 if (!request) 109 return -ENOMEM; 110 111 if (wdev->conn->params.channel) 112 request->channels[0] = wdev->conn->params.channel; 113 else { 114 int i = 0, j; 115 enum ieee80211_band band; 116 struct ieee80211_supported_band *bands; 117 struct ieee80211_channel *channel; 118 119 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 120 bands = wdev->wiphy->bands[band]; 121 if (!bands) 122 continue; 123 for (j = 0; j < bands->n_channels; j++) { 124 channel = &bands->channels[j]; 125 if (channel->flags & IEEE80211_CHAN_DISABLED) 126 continue; 127 request->channels[i++] = channel; 128 } 129 request->rates[band] = (1 << bands->n_bitrates) - 1; 130 } 131 n_channels = i; 132 } 133 request->n_channels = n_channels; 134 request->ssids = (void *)&request->channels[n_channels]; 135 request->n_ssids = 1; 136 137 memcpy(request->ssids[0].ssid, wdev->conn->params.ssid, 138 wdev->conn->params.ssid_len); 139 request->ssids[0].ssid_len = wdev->conn->params.ssid_len; 140 141 request->wdev = wdev; 142 request->wiphy = &rdev->wiphy; 143 request->scan_start = jiffies; 144 145 rdev->scan_req = request; 146 147 err = rdev_scan(rdev, request); 148 if (!err) { 149 wdev->conn->state = CFG80211_CONN_SCANNING; 150 nl80211_send_scan_start(rdev, wdev); 151 dev_hold(wdev->netdev); 152 } else { 153 rdev->scan_req = NULL; 154 kfree(request); 155 } 156 return err; 157 } 158 159 static int cfg80211_conn_do_work(struct wireless_dev *wdev) 160 { 161 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 162 struct cfg80211_connect_params *params; 163 struct cfg80211_assoc_request req = {}; 164 int err; 165 166 ASSERT_WDEV_LOCK(wdev); 167 168 if (!wdev->conn) 169 return 0; 170 171 params = &wdev->conn->params; 172 173 switch (wdev->conn->state) { 174 case CFG80211_CONN_SCAN_AGAIN: 175 return cfg80211_conn_scan(wdev); 176 case CFG80211_CONN_AUTHENTICATE_NEXT: 177 BUG_ON(!rdev->ops->auth); 178 wdev->conn->state = CFG80211_CONN_AUTHENTICATING; 179 return __cfg80211_mlme_auth(rdev, wdev->netdev, 180 params->channel, params->auth_type, 181 params->bssid, 182 params->ssid, params->ssid_len, 183 NULL, 0, 184 params->key, params->key_len, 185 params->key_idx, NULL, 0); 186 case CFG80211_CONN_ASSOCIATE_NEXT: 187 BUG_ON(!rdev->ops->assoc); 188 wdev->conn->state = CFG80211_CONN_ASSOCIATING; 189 if (wdev->conn->prev_bssid_valid) 190 req.prev_bssid = wdev->conn->prev_bssid; 191 req.ie = params->ie; 192 req.ie_len = params->ie_len; 193 req.use_mfp = params->mfp != NL80211_MFP_NO; 194 req.crypto = params->crypto; 195 req.flags = params->flags; 196 req.ht_capa = params->ht_capa; 197 req.ht_capa_mask = params->ht_capa_mask; 198 req.vht_capa = params->vht_capa; 199 req.vht_capa_mask = params->vht_capa_mask; 200 201 err = __cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel, 202 params->bssid, params->ssid, 203 params->ssid_len, &req); 204 if (err) 205 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid, 206 NULL, 0, 207 WLAN_REASON_DEAUTH_LEAVING, 208 false); 209 return err; 210 case CFG80211_CONN_DEAUTH_ASSOC_FAIL: 211 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid, 212 NULL, 0, 213 WLAN_REASON_DEAUTH_LEAVING, false); 214 /* return an error so that we call __cfg80211_connect_result() */ 215 return -EINVAL; 216 default: 217 return 0; 218 } 219 } 220 221 void cfg80211_conn_work(struct work_struct *work) 222 { 223 struct cfg80211_registered_device *rdev = 224 container_of(work, struct cfg80211_registered_device, conn_work); 225 struct wireless_dev *wdev; 226 u8 bssid_buf[ETH_ALEN], *bssid = NULL; 227 228 rtnl_lock(); 229 cfg80211_lock_rdev(rdev); 230 mutex_lock(&rdev->devlist_mtx); 231 mutex_lock(&rdev->sched_scan_mtx); 232 233 list_for_each_entry(wdev, &rdev->wdev_list, list) { 234 if (!wdev->netdev) 235 continue; 236 237 wdev_lock(wdev); 238 if (!netif_running(wdev->netdev)) { 239 wdev_unlock(wdev); 240 continue; 241 } 242 if (wdev->sme_state != CFG80211_SME_CONNECTING || !wdev->conn) { 243 wdev_unlock(wdev); 244 continue; 245 } 246 if (wdev->conn->params.bssid) { 247 memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN); 248 bssid = bssid_buf; 249 } 250 if (cfg80211_conn_do_work(wdev)) 251 __cfg80211_connect_result( 252 wdev->netdev, bssid, 253 NULL, 0, NULL, 0, 254 WLAN_STATUS_UNSPECIFIED_FAILURE, 255 false, NULL); 256 wdev_unlock(wdev); 257 } 258 259 mutex_unlock(&rdev->sched_scan_mtx); 260 mutex_unlock(&rdev->devlist_mtx); 261 cfg80211_unlock_rdev(rdev); 262 rtnl_unlock(); 263 } 264 265 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev) 266 { 267 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 268 struct cfg80211_bss *bss; 269 u16 capa = WLAN_CAPABILITY_ESS; 270 271 ASSERT_WDEV_LOCK(wdev); 272 273 if (wdev->conn->params.privacy) 274 capa |= WLAN_CAPABILITY_PRIVACY; 275 276 bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel, 277 wdev->conn->params.bssid, 278 wdev->conn->params.ssid, 279 wdev->conn->params.ssid_len, 280 WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY, 281 capa); 282 if (!bss) 283 return NULL; 284 285 memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN); 286 wdev->conn->params.bssid = wdev->conn->bssid; 287 wdev->conn->params.channel = bss->channel; 288 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT; 289 schedule_work(&rdev->conn_work); 290 291 return bss; 292 } 293 294 static void __cfg80211_sme_scan_done(struct net_device *dev) 295 { 296 struct wireless_dev *wdev = dev->ieee80211_ptr; 297 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 298 struct cfg80211_bss *bss; 299 300 ASSERT_WDEV_LOCK(wdev); 301 302 if (wdev->sme_state != CFG80211_SME_CONNECTING) 303 return; 304 305 if (!wdev->conn) 306 return; 307 308 if (wdev->conn->state != CFG80211_CONN_SCANNING && 309 wdev->conn->state != CFG80211_CONN_SCAN_AGAIN) 310 return; 311 312 bss = cfg80211_get_conn_bss(wdev); 313 if (bss) { 314 cfg80211_put_bss(&rdev->wiphy, bss); 315 } else { 316 /* not found */ 317 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) 318 schedule_work(&rdev->conn_work); 319 else 320 __cfg80211_connect_result( 321 wdev->netdev, 322 wdev->conn->params.bssid, 323 NULL, 0, NULL, 0, 324 WLAN_STATUS_UNSPECIFIED_FAILURE, 325 false, NULL); 326 } 327 } 328 329 void cfg80211_sme_scan_done(struct net_device *dev) 330 { 331 struct wireless_dev *wdev = dev->ieee80211_ptr; 332 333 wdev_lock(wdev); 334 __cfg80211_sme_scan_done(dev); 335 wdev_unlock(wdev); 336 } 337 338 void cfg80211_sme_rx_auth(struct net_device *dev, 339 const u8 *buf, size_t len) 340 { 341 struct wireless_dev *wdev = dev->ieee80211_ptr; 342 struct wiphy *wiphy = wdev->wiphy; 343 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 344 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf; 345 u16 status_code = le16_to_cpu(mgmt->u.auth.status_code); 346 347 ASSERT_WDEV_LOCK(wdev); 348 349 /* should only RX auth frames when connecting */ 350 if (wdev->sme_state != CFG80211_SME_CONNECTING) 351 return; 352 353 if (WARN_ON(!wdev->conn)) 354 return; 355 356 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG && 357 wdev->conn->auto_auth && 358 wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) { 359 /* select automatically between only open, shared, leap */ 360 switch (wdev->conn->params.auth_type) { 361 case NL80211_AUTHTYPE_OPEN_SYSTEM: 362 if (wdev->connect_keys) 363 wdev->conn->params.auth_type = 364 NL80211_AUTHTYPE_SHARED_KEY; 365 else 366 wdev->conn->params.auth_type = 367 NL80211_AUTHTYPE_NETWORK_EAP; 368 break; 369 case NL80211_AUTHTYPE_SHARED_KEY: 370 wdev->conn->params.auth_type = 371 NL80211_AUTHTYPE_NETWORK_EAP; 372 break; 373 default: 374 /* huh? */ 375 wdev->conn->params.auth_type = 376 NL80211_AUTHTYPE_OPEN_SYSTEM; 377 break; 378 } 379 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT; 380 schedule_work(&rdev->conn_work); 381 } else if (status_code != WLAN_STATUS_SUCCESS) { 382 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0, 383 status_code, false, NULL); 384 } else if (wdev->sme_state == CFG80211_SME_CONNECTING && 385 wdev->conn->state == CFG80211_CONN_AUTHENTICATING) { 386 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT; 387 schedule_work(&rdev->conn_work); 388 } 389 } 390 391 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev) 392 { 393 struct wiphy *wiphy = wdev->wiphy; 394 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 395 396 if (WARN_ON(!wdev->conn)) 397 return false; 398 399 if (!wdev->conn->prev_bssid_valid) 400 return false; 401 402 /* 403 * Some stupid APs don't accept reassoc, so we 404 * need to fall back to trying regular assoc. 405 */ 406 wdev->conn->prev_bssid_valid = false; 407 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT; 408 schedule_work(&rdev->conn_work); 409 410 return true; 411 } 412 413 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev) 414 { 415 struct wiphy *wiphy = wdev->wiphy; 416 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); 417 418 wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL; 419 schedule_work(&rdev->conn_work); 420 } 421 422 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid, 423 const u8 *req_ie, size_t req_ie_len, 424 const u8 *resp_ie, size_t resp_ie_len, 425 u16 status, bool wextev, 426 struct cfg80211_bss *bss) 427 { 428 struct wireless_dev *wdev = dev->ieee80211_ptr; 429 const u8 *country_ie; 430 #ifdef CONFIG_CFG80211_WEXT 431 union iwreq_data wrqu; 432 #endif 433 434 ASSERT_WDEV_LOCK(wdev); 435 436 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION && 437 wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) 438 return; 439 440 if (wdev->sme_state != CFG80211_SME_CONNECTING) 441 return; 442 443 nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev, 444 bssid, req_ie, req_ie_len, 445 resp_ie, resp_ie_len, 446 status, GFP_KERNEL); 447 448 #ifdef CONFIG_CFG80211_WEXT 449 if (wextev) { 450 if (req_ie && status == WLAN_STATUS_SUCCESS) { 451 memset(&wrqu, 0, sizeof(wrqu)); 452 wrqu.data.length = req_ie_len; 453 wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie); 454 } 455 456 if (resp_ie && status == WLAN_STATUS_SUCCESS) { 457 memset(&wrqu, 0, sizeof(wrqu)); 458 wrqu.data.length = resp_ie_len; 459 wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie); 460 } 461 462 memset(&wrqu, 0, sizeof(wrqu)); 463 wrqu.ap_addr.sa_family = ARPHRD_ETHER; 464 if (bssid && status == WLAN_STATUS_SUCCESS) { 465 memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN); 466 memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN); 467 wdev->wext.prev_bssid_valid = true; 468 } 469 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL); 470 } 471 #endif 472 473 if (wdev->current_bss) { 474 cfg80211_unhold_bss(wdev->current_bss); 475 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 476 wdev->current_bss = NULL; 477 } 478 479 if (wdev->conn) 480 wdev->conn->state = CFG80211_CONN_IDLE; 481 482 if (status != WLAN_STATUS_SUCCESS) { 483 wdev->sme_state = CFG80211_SME_IDLE; 484 if (wdev->conn) 485 kfree(wdev->conn->ie); 486 kfree(wdev->conn); 487 wdev->conn = NULL; 488 kfree(wdev->connect_keys); 489 wdev->connect_keys = NULL; 490 wdev->ssid_len = 0; 491 cfg80211_put_bss(wdev->wiphy, bss); 492 return; 493 } 494 495 if (!bss) 496 bss = cfg80211_get_bss(wdev->wiphy, 497 wdev->conn ? wdev->conn->params.channel : 498 NULL, 499 bssid, 500 wdev->ssid, wdev->ssid_len, 501 WLAN_CAPABILITY_ESS, 502 WLAN_CAPABILITY_ESS); 503 504 if (WARN_ON(!bss)) 505 return; 506 507 cfg80211_hold_bss(bss_from_pub(bss)); 508 wdev->current_bss = bss_from_pub(bss); 509 510 wdev->sme_state = CFG80211_SME_CONNECTED; 511 cfg80211_upload_connect_keys(wdev); 512 513 rcu_read_lock(); 514 country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY); 515 if (!country_ie) { 516 rcu_read_unlock(); 517 return; 518 } 519 520 country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC); 521 rcu_read_unlock(); 522 523 if (!country_ie) 524 return; 525 526 /* 527 * ieee80211_bss_get_ie() ensures we can access: 528 * - country_ie + 2, the start of the country ie data, and 529 * - and country_ie[1] which is the IE length 530 */ 531 regulatory_hint_11d(wdev->wiphy, bss->channel->band, 532 country_ie + 2, country_ie[1]); 533 kfree(country_ie); 534 } 535 536 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid, 537 const u8 *req_ie, size_t req_ie_len, 538 const u8 *resp_ie, size_t resp_ie_len, 539 u16 status, gfp_t gfp) 540 { 541 struct wireless_dev *wdev = dev->ieee80211_ptr; 542 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 543 struct cfg80211_event *ev; 544 unsigned long flags; 545 546 CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING); 547 548 ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp); 549 if (!ev) 550 return; 551 552 ev->type = EVENT_CONNECT_RESULT; 553 if (bssid) 554 memcpy(ev->cr.bssid, bssid, ETH_ALEN); 555 if (req_ie_len) { 556 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev); 557 ev->cr.req_ie_len = req_ie_len; 558 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len); 559 } 560 if (resp_ie_len) { 561 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len; 562 ev->cr.resp_ie_len = resp_ie_len; 563 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len); 564 } 565 ev->cr.status = status; 566 567 spin_lock_irqsave(&wdev->event_lock, flags); 568 list_add_tail(&ev->list, &wdev->event_list); 569 spin_unlock_irqrestore(&wdev->event_lock, flags); 570 queue_work(cfg80211_wq, &rdev->event_work); 571 } 572 EXPORT_SYMBOL(cfg80211_connect_result); 573 574 void __cfg80211_roamed(struct wireless_dev *wdev, 575 struct cfg80211_bss *bss, 576 const u8 *req_ie, size_t req_ie_len, 577 const u8 *resp_ie, size_t resp_ie_len) 578 { 579 #ifdef CONFIG_CFG80211_WEXT 580 union iwreq_data wrqu; 581 #endif 582 ASSERT_WDEV_LOCK(wdev); 583 584 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION && 585 wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) 586 goto out; 587 588 if (wdev->sme_state != CFG80211_SME_CONNECTED) 589 goto out; 590 591 /* internal error -- how did we get to CONNECTED w/o BSS? */ 592 if (WARN_ON(!wdev->current_bss)) { 593 goto out; 594 } 595 596 cfg80211_unhold_bss(wdev->current_bss); 597 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 598 wdev->current_bss = NULL; 599 600 cfg80211_hold_bss(bss_from_pub(bss)); 601 wdev->current_bss = bss_from_pub(bss); 602 603 nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bss->bssid, 604 req_ie, req_ie_len, resp_ie, resp_ie_len, 605 GFP_KERNEL); 606 607 #ifdef CONFIG_CFG80211_WEXT 608 if (req_ie) { 609 memset(&wrqu, 0, sizeof(wrqu)); 610 wrqu.data.length = req_ie_len; 611 wireless_send_event(wdev->netdev, IWEVASSOCREQIE, 612 &wrqu, req_ie); 613 } 614 615 if (resp_ie) { 616 memset(&wrqu, 0, sizeof(wrqu)); 617 wrqu.data.length = resp_ie_len; 618 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE, 619 &wrqu, resp_ie); 620 } 621 622 memset(&wrqu, 0, sizeof(wrqu)); 623 wrqu.ap_addr.sa_family = ARPHRD_ETHER; 624 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN); 625 memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN); 626 wdev->wext.prev_bssid_valid = true; 627 wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL); 628 #endif 629 630 return; 631 out: 632 cfg80211_put_bss(wdev->wiphy, bss); 633 } 634 635 void cfg80211_roamed(struct net_device *dev, 636 struct ieee80211_channel *channel, 637 const u8 *bssid, 638 const u8 *req_ie, size_t req_ie_len, 639 const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp) 640 { 641 struct wireless_dev *wdev = dev->ieee80211_ptr; 642 struct cfg80211_bss *bss; 643 644 CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED); 645 646 bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid, 647 wdev->ssid_len, WLAN_CAPABILITY_ESS, 648 WLAN_CAPABILITY_ESS); 649 if (WARN_ON(!bss)) 650 return; 651 652 cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie, 653 resp_ie_len, gfp); 654 } 655 EXPORT_SYMBOL(cfg80211_roamed); 656 657 void cfg80211_roamed_bss(struct net_device *dev, 658 struct cfg80211_bss *bss, const u8 *req_ie, 659 size_t req_ie_len, const u8 *resp_ie, 660 size_t resp_ie_len, gfp_t gfp) 661 { 662 struct wireless_dev *wdev = dev->ieee80211_ptr; 663 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 664 struct cfg80211_event *ev; 665 unsigned long flags; 666 667 CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED); 668 669 if (WARN_ON(!bss)) 670 return; 671 672 ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp); 673 if (!ev) { 674 cfg80211_put_bss(wdev->wiphy, bss); 675 return; 676 } 677 678 ev->type = EVENT_ROAMED; 679 ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev); 680 ev->rm.req_ie_len = req_ie_len; 681 memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len); 682 ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len; 683 ev->rm.resp_ie_len = resp_ie_len; 684 memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len); 685 ev->rm.bss = bss; 686 687 spin_lock_irqsave(&wdev->event_lock, flags); 688 list_add_tail(&ev->list, &wdev->event_list); 689 spin_unlock_irqrestore(&wdev->event_lock, flags); 690 queue_work(cfg80211_wq, &rdev->event_work); 691 } 692 EXPORT_SYMBOL(cfg80211_roamed_bss); 693 694 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie, 695 size_t ie_len, u16 reason, bool from_ap) 696 { 697 struct wireless_dev *wdev = dev->ieee80211_ptr; 698 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 699 int i; 700 #ifdef CONFIG_CFG80211_WEXT 701 union iwreq_data wrqu; 702 #endif 703 704 ASSERT_WDEV_LOCK(wdev); 705 706 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION && 707 wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) 708 return; 709 710 if (wdev->sme_state != CFG80211_SME_CONNECTED) 711 return; 712 713 if (wdev->current_bss) { 714 cfg80211_unhold_bss(wdev->current_bss); 715 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 716 } 717 718 wdev->current_bss = NULL; 719 wdev->sme_state = CFG80211_SME_IDLE; 720 wdev->ssid_len = 0; 721 722 if (wdev->conn) { 723 kfree(wdev->conn->ie); 724 wdev->conn->ie = NULL; 725 kfree(wdev->conn); 726 wdev->conn = NULL; 727 } 728 729 nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap); 730 731 /* 732 * Delete all the keys ... pairwise keys can't really 733 * exist any more anyway, but default keys might. 734 */ 735 if (rdev->ops->del_key) 736 for (i = 0; i < 6; i++) 737 rdev_del_key(rdev, dev, i, false, NULL); 738 739 #ifdef CONFIG_CFG80211_WEXT 740 memset(&wrqu, 0, sizeof(wrqu)); 741 wrqu.ap_addr.sa_family = ARPHRD_ETHER; 742 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL); 743 wdev->wext.connect.ssid_len = 0; 744 #endif 745 746 schedule_work(&cfg80211_disconnect_work); 747 } 748 749 void cfg80211_disconnected(struct net_device *dev, u16 reason, 750 u8 *ie, size_t ie_len, gfp_t gfp) 751 { 752 struct wireless_dev *wdev = dev->ieee80211_ptr; 753 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 754 struct cfg80211_event *ev; 755 unsigned long flags; 756 757 CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED); 758 759 ev = kzalloc(sizeof(*ev) + ie_len, gfp); 760 if (!ev) 761 return; 762 763 ev->type = EVENT_DISCONNECTED; 764 ev->dc.ie = ((u8 *)ev) + sizeof(*ev); 765 ev->dc.ie_len = ie_len; 766 memcpy((void *)ev->dc.ie, ie, ie_len); 767 ev->dc.reason = reason; 768 769 spin_lock_irqsave(&wdev->event_lock, flags); 770 list_add_tail(&ev->list, &wdev->event_list); 771 spin_unlock_irqrestore(&wdev->event_lock, flags); 772 queue_work(cfg80211_wq, &rdev->event_work); 773 } 774 EXPORT_SYMBOL(cfg80211_disconnected); 775 776 int __cfg80211_connect(struct cfg80211_registered_device *rdev, 777 struct net_device *dev, 778 struct cfg80211_connect_params *connect, 779 struct cfg80211_cached_keys *connkeys, 780 const u8 *prev_bssid) 781 { 782 struct wireless_dev *wdev = dev->ieee80211_ptr; 783 struct cfg80211_bss *bss = NULL; 784 int err; 785 786 ASSERT_WDEV_LOCK(wdev); 787 788 if (wdev->sme_state != CFG80211_SME_IDLE) 789 return -EALREADY; 790 791 if (WARN_ON(wdev->connect_keys)) { 792 kfree(wdev->connect_keys); 793 wdev->connect_keys = NULL; 794 } 795 796 cfg80211_oper_and_ht_capa(&connect->ht_capa_mask, 797 rdev->wiphy.ht_capa_mod_mask); 798 799 if (connkeys && connkeys->def >= 0) { 800 int idx; 801 u32 cipher; 802 803 idx = connkeys->def; 804 cipher = connkeys->params[idx].cipher; 805 /* If given a WEP key we may need it for shared key auth */ 806 if (cipher == WLAN_CIPHER_SUITE_WEP40 || 807 cipher == WLAN_CIPHER_SUITE_WEP104) { 808 connect->key_idx = idx; 809 connect->key = connkeys->params[idx].key; 810 connect->key_len = connkeys->params[idx].key_len; 811 812 /* 813 * If ciphers are not set (e.g. when going through 814 * iwconfig), we have to set them appropriately here. 815 */ 816 if (connect->crypto.cipher_group == 0) 817 connect->crypto.cipher_group = cipher; 818 819 if (connect->crypto.n_ciphers_pairwise == 0) { 820 connect->crypto.n_ciphers_pairwise = 1; 821 connect->crypto.ciphers_pairwise[0] = cipher; 822 } 823 } 824 } 825 826 if (!rdev->ops->connect) { 827 if (!rdev->ops->auth || !rdev->ops->assoc) 828 return -EOPNOTSUPP; 829 830 if (WARN_ON(wdev->conn)) 831 return -EINPROGRESS; 832 833 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL); 834 if (!wdev->conn) 835 return -ENOMEM; 836 837 /* 838 * Copy all parameters, and treat explicitly IEs, BSSID, SSID. 839 */ 840 memcpy(&wdev->conn->params, connect, sizeof(*connect)); 841 if (connect->bssid) { 842 wdev->conn->params.bssid = wdev->conn->bssid; 843 memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN); 844 } 845 846 if (connect->ie) { 847 wdev->conn->ie = kmemdup(connect->ie, connect->ie_len, 848 GFP_KERNEL); 849 wdev->conn->params.ie = wdev->conn->ie; 850 if (!wdev->conn->ie) { 851 kfree(wdev->conn); 852 wdev->conn = NULL; 853 return -ENOMEM; 854 } 855 } 856 857 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) { 858 wdev->conn->auto_auth = true; 859 /* start with open system ... should mostly work */ 860 wdev->conn->params.auth_type = 861 NL80211_AUTHTYPE_OPEN_SYSTEM; 862 } else { 863 wdev->conn->auto_auth = false; 864 } 865 866 memcpy(wdev->ssid, connect->ssid, connect->ssid_len); 867 wdev->ssid_len = connect->ssid_len; 868 wdev->conn->params.ssid = wdev->ssid; 869 wdev->conn->params.ssid_len = connect->ssid_len; 870 871 /* see if we have the bss already */ 872 bss = cfg80211_get_conn_bss(wdev); 873 874 wdev->sme_state = CFG80211_SME_CONNECTING; 875 wdev->connect_keys = connkeys; 876 877 if (prev_bssid) { 878 memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN); 879 wdev->conn->prev_bssid_valid = true; 880 } 881 882 /* we're good if we have a matching bss struct */ 883 if (bss) { 884 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT; 885 err = cfg80211_conn_do_work(wdev); 886 cfg80211_put_bss(wdev->wiphy, bss); 887 } else { 888 /* otherwise we'll need to scan for the AP first */ 889 err = cfg80211_conn_scan(wdev); 890 /* 891 * If we can't scan right now, then we need to scan again 892 * after the current scan finished, since the parameters 893 * changed (unless we find a good AP anyway). 894 */ 895 if (err == -EBUSY) { 896 err = 0; 897 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN; 898 } 899 } 900 if (err) { 901 kfree(wdev->conn->ie); 902 kfree(wdev->conn); 903 wdev->conn = NULL; 904 wdev->sme_state = CFG80211_SME_IDLE; 905 wdev->connect_keys = NULL; 906 wdev->ssid_len = 0; 907 } 908 909 return err; 910 } else { 911 wdev->sme_state = CFG80211_SME_CONNECTING; 912 wdev->connect_keys = connkeys; 913 err = rdev_connect(rdev, dev, connect); 914 if (err) { 915 wdev->connect_keys = NULL; 916 wdev->sme_state = CFG80211_SME_IDLE; 917 return err; 918 } 919 920 memcpy(wdev->ssid, connect->ssid, connect->ssid_len); 921 wdev->ssid_len = connect->ssid_len; 922 923 return 0; 924 } 925 } 926 927 int cfg80211_connect(struct cfg80211_registered_device *rdev, 928 struct net_device *dev, 929 struct cfg80211_connect_params *connect, 930 struct cfg80211_cached_keys *connkeys) 931 { 932 int err; 933 934 mutex_lock(&rdev->devlist_mtx); 935 /* might request scan - scan_mtx -> wdev_mtx dependency */ 936 mutex_lock(&rdev->sched_scan_mtx); 937 wdev_lock(dev->ieee80211_ptr); 938 err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL); 939 wdev_unlock(dev->ieee80211_ptr); 940 mutex_unlock(&rdev->sched_scan_mtx); 941 mutex_unlock(&rdev->devlist_mtx); 942 943 return err; 944 } 945 946 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev, 947 struct net_device *dev, u16 reason, bool wextev) 948 { 949 struct wireless_dev *wdev = dev->ieee80211_ptr; 950 int err; 951 952 ASSERT_WDEV_LOCK(wdev); 953 954 if (wdev->sme_state == CFG80211_SME_IDLE) 955 return -EINVAL; 956 957 kfree(wdev->connect_keys); 958 wdev->connect_keys = NULL; 959 960 if (!rdev->ops->disconnect) { 961 if (!rdev->ops->deauth) 962 return -EOPNOTSUPP; 963 964 /* was it connected by userspace SME? */ 965 if (!wdev->conn) { 966 cfg80211_mlme_down(rdev, dev); 967 goto disconnect; 968 } 969 970 if (wdev->sme_state == CFG80211_SME_CONNECTING && 971 (wdev->conn->state == CFG80211_CONN_SCANNING || 972 wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) { 973 wdev->sme_state = CFG80211_SME_IDLE; 974 kfree(wdev->conn->ie); 975 kfree(wdev->conn); 976 wdev->conn = NULL; 977 wdev->ssid_len = 0; 978 return 0; 979 } 980 981 /* wdev->conn->params.bssid must be set if > SCANNING */ 982 err = __cfg80211_mlme_deauth(rdev, dev, 983 wdev->conn->params.bssid, 984 NULL, 0, reason, false); 985 if (err) 986 return err; 987 } else { 988 err = rdev_disconnect(rdev, dev, reason); 989 if (err) 990 return err; 991 } 992 993 disconnect: 994 if (wdev->sme_state == CFG80211_SME_CONNECTED) 995 __cfg80211_disconnected(dev, NULL, 0, 0, false); 996 else if (wdev->sme_state == CFG80211_SME_CONNECTING) 997 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0, 998 WLAN_STATUS_UNSPECIFIED_FAILURE, 999 wextev, NULL); 1000 1001 return 0; 1002 } 1003 1004 int cfg80211_disconnect(struct cfg80211_registered_device *rdev, 1005 struct net_device *dev, 1006 u16 reason, bool wextev) 1007 { 1008 int err; 1009 1010 wdev_lock(dev->ieee80211_ptr); 1011 err = __cfg80211_disconnect(rdev, dev, reason, wextev); 1012 wdev_unlock(dev->ieee80211_ptr); 1013 1014 return err; 1015 } 1016 1017 void cfg80211_sme_disassoc(struct net_device *dev, 1018 struct cfg80211_internal_bss *bss) 1019 { 1020 struct wireless_dev *wdev = dev->ieee80211_ptr; 1021 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy); 1022 u8 bssid[ETH_ALEN]; 1023 1024 ASSERT_WDEV_LOCK(wdev); 1025 1026 if (!wdev->conn) 1027 return; 1028 1029 if (wdev->conn->state == CFG80211_CONN_IDLE) 1030 return; 1031 1032 /* 1033 * Ok, so the association was made by this SME -- we don't 1034 * want it any more so deauthenticate too. 1035 */ 1036 1037 memcpy(bssid, bss->pub.bssid, ETH_ALEN); 1038 1039 __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0, 1040 WLAN_REASON_DEAUTH_LEAVING, false); 1041 } 1042