1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * SME code for cfg80211 4 * both driver SME event handling and the SME implementation 5 * (for nl80211's connect() and wext) 6 * 7 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> 8 * Copyright (C) 2009 Intel Corporation. All rights reserved. 9 * Copyright 2017 Intel Deutschland GmbH 10 */ 11 12 #include <linux/etherdevice.h> 13 #include <linux/if_arp.h> 14 #include <linux/slab.h> 15 #include <linux/workqueue.h> 16 #include <linux/wireless.h> 17 #include <linux/export.h> 18 #include <net/iw_handler.h> 19 #include <net/cfg80211.h> 20 #include <net/rtnetlink.h> 21 #include "nl80211.h" 22 #include "reg.h" 23 #include "rdev-ops.h" 24 25 /* 26 * Software SME in cfg80211, using auth/assoc/deauth calls to the 27 * driver. This is is for implementing nl80211's connect/disconnect 28 * and wireless extensions (if configured.) 29 */ 30 31 struct cfg80211_conn { 32 struct cfg80211_connect_params params; 33 /* these are sub-states of the _CONNECTING sme_state */ 34 enum { 35 CFG80211_CONN_SCANNING, 36 CFG80211_CONN_SCAN_AGAIN, 37 CFG80211_CONN_AUTHENTICATE_NEXT, 38 CFG80211_CONN_AUTHENTICATING, 39 CFG80211_CONN_AUTH_FAILED_TIMEOUT, 40 CFG80211_CONN_ASSOCIATE_NEXT, 41 CFG80211_CONN_ASSOCIATING, 42 CFG80211_CONN_ASSOC_FAILED, 43 CFG80211_CONN_ASSOC_FAILED_TIMEOUT, 44 CFG80211_CONN_DEAUTH, 45 CFG80211_CONN_ABANDON, 46 CFG80211_CONN_CONNECTED, 47 } state; 48 u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN]; 49 const u8 *ie; 50 size_t ie_len; 51 bool auto_auth, prev_bssid_valid; 52 }; 53 54 static void cfg80211_sme_free(struct wireless_dev *wdev) 55 { 56 if (!wdev->conn) 57 return; 58 59 kfree(wdev->conn->ie); 60 kfree(wdev->conn); 61 wdev->conn = NULL; 62 } 63 64 static int cfg80211_conn_scan(struct wireless_dev *wdev) 65 { 66 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 67 struct cfg80211_scan_request *request; 68 int n_channels, err; 69 70 ASSERT_RTNL(); 71 ASSERT_WDEV_LOCK(wdev); 72 73 if (rdev->scan_req || rdev->scan_msg) 74 return -EBUSY; 75 76 if (wdev->conn->params.channel) 77 n_channels = 1; 78 else 79 n_channels = ieee80211_get_num_supported_channels(wdev->wiphy); 80 81 request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) + 82 sizeof(request->channels[0]) * n_channels, 83 GFP_KERNEL); 84 if (!request) 85 return -ENOMEM; 86 87 if (wdev->conn->params.channel) { 88 enum nl80211_band band = wdev->conn->params.channel->band; 89 struct ieee80211_supported_band *sband = 90 wdev->wiphy->bands[band]; 91 92 if (!sband) { 93 kfree(request); 94 return -EINVAL; 95 } 96 request->channels[0] = wdev->conn->params.channel; 97 request->rates[band] = (1 << sband->n_bitrates) - 1; 98 } else { 99 int i = 0, j; 100 enum nl80211_band band; 101 struct ieee80211_supported_band *bands; 102 struct ieee80211_channel *channel; 103 104 for (band = 0; band < NUM_NL80211_BANDS; band++) { 105 bands = wdev->wiphy->bands[band]; 106 if (!bands) 107 continue; 108 for (j = 0; j < bands->n_channels; j++) { 109 channel = &bands->channels[j]; 110 if (channel->flags & IEEE80211_CHAN_DISABLED) 111 continue; 112 request->channels[i++] = channel; 113 } 114 request->rates[band] = (1 << bands->n_bitrates) - 1; 115 } 116 n_channels = i; 117 } 118 request->n_channels = n_channels; 119 request->ssids = (void *)&request->channels[n_channels]; 120 request->n_ssids = 1; 121 122 memcpy(request->ssids[0].ssid, wdev->conn->params.ssid, 123 wdev->conn->params.ssid_len); 124 request->ssids[0].ssid_len = wdev->conn->params.ssid_len; 125 126 eth_broadcast_addr(request->bssid); 127 128 request->wdev = wdev; 129 request->wiphy = &rdev->wiphy; 130 request->scan_start = jiffies; 131 132 rdev->scan_req = request; 133 134 err = rdev_scan(rdev, request); 135 if (!err) { 136 wdev->conn->state = CFG80211_CONN_SCANNING; 137 nl80211_send_scan_start(rdev, wdev); 138 dev_hold(wdev->netdev); 139 } else { 140 rdev->scan_req = NULL; 141 kfree(request); 142 } 143 return err; 144 } 145 146 static int cfg80211_conn_do_work(struct wireless_dev *wdev, 147 enum nl80211_timeout_reason *treason) 148 { 149 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 150 struct cfg80211_connect_params *params; 151 struct cfg80211_assoc_request req = {}; 152 int err; 153 154 ASSERT_WDEV_LOCK(wdev); 155 156 if (!wdev->conn) 157 return 0; 158 159 params = &wdev->conn->params; 160 161 switch (wdev->conn->state) { 162 case CFG80211_CONN_SCANNING: 163 /* didn't find it during scan ... */ 164 return -ENOENT; 165 case CFG80211_CONN_SCAN_AGAIN: 166 return cfg80211_conn_scan(wdev); 167 case CFG80211_CONN_AUTHENTICATE_NEXT: 168 if (WARN_ON(!rdev->ops->auth)) 169 return -EOPNOTSUPP; 170 wdev->conn->state = CFG80211_CONN_AUTHENTICATING; 171 return cfg80211_mlme_auth(rdev, wdev->netdev, 172 params->channel, params->auth_type, 173 params->bssid, 174 params->ssid, params->ssid_len, 175 NULL, 0, 176 params->key, params->key_len, 177 params->key_idx, NULL, 0); 178 case CFG80211_CONN_AUTH_FAILED_TIMEOUT: 179 *treason = NL80211_TIMEOUT_AUTH; 180 return -ENOTCONN; 181 case CFG80211_CONN_ASSOCIATE_NEXT: 182 if (WARN_ON(!rdev->ops->assoc)) 183 return -EOPNOTSUPP; 184 wdev->conn->state = CFG80211_CONN_ASSOCIATING; 185 if (wdev->conn->prev_bssid_valid) 186 req.prev_bssid = wdev->conn->prev_bssid; 187 req.ie = params->ie; 188 req.ie_len = params->ie_len; 189 req.use_mfp = params->mfp != NL80211_MFP_NO; 190 req.crypto = params->crypto; 191 req.flags = params->flags; 192 req.ht_capa = params->ht_capa; 193 req.ht_capa_mask = params->ht_capa_mask; 194 req.vht_capa = params->vht_capa; 195 req.vht_capa_mask = params->vht_capa_mask; 196 197 err = cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel, 198 params->bssid, params->ssid, 199 params->ssid_len, &req); 200 if (err) 201 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid, 202 NULL, 0, 203 WLAN_REASON_DEAUTH_LEAVING, 204 false); 205 return err; 206 case CFG80211_CONN_ASSOC_FAILED_TIMEOUT: 207 *treason = NL80211_TIMEOUT_ASSOC; 208 /* fall through */ 209 case CFG80211_CONN_ASSOC_FAILED: 210 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid, 211 NULL, 0, 212 WLAN_REASON_DEAUTH_LEAVING, false); 213 return -ENOTCONN; 214 case CFG80211_CONN_DEAUTH: 215 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid, 216 NULL, 0, 217 WLAN_REASON_DEAUTH_LEAVING, false); 218 /* fall through */ 219 case CFG80211_CONN_ABANDON: 220 /* free directly, disconnected event already sent */ 221 cfg80211_sme_free(wdev); 222 return 0; 223 default: 224 return 0; 225 } 226 } 227 228 void cfg80211_conn_work(struct work_struct *work) 229 { 230 struct cfg80211_registered_device *rdev = 231 container_of(work, struct cfg80211_registered_device, conn_work); 232 struct wireless_dev *wdev; 233 u8 bssid_buf[ETH_ALEN], *bssid = NULL; 234 enum nl80211_timeout_reason treason; 235 236 rtnl_lock(); 237 238 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 239 if (!wdev->netdev) 240 continue; 241 242 wdev_lock(wdev); 243 if (!netif_running(wdev->netdev)) { 244 wdev_unlock(wdev); 245 continue; 246 } 247 if (!wdev->conn || 248 wdev->conn->state == CFG80211_CONN_CONNECTED) { 249 wdev_unlock(wdev); 250 continue; 251 } 252 if (wdev->conn->params.bssid) { 253 memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN); 254 bssid = bssid_buf; 255 } 256 treason = NL80211_TIMEOUT_UNSPECIFIED; 257 if (cfg80211_conn_do_work(wdev, &treason)) { 258 struct cfg80211_connect_resp_params cr; 259 260 memset(&cr, 0, sizeof(cr)); 261 cr.status = -1; 262 cr.bssid = bssid; 263 cr.timeout_reason = treason; 264 __cfg80211_connect_result(wdev->netdev, &cr, false); 265 } 266 wdev_unlock(wdev); 267 } 268 269 rtnl_unlock(); 270 } 271 272 /* Returned bss is reference counted and must be cleaned up appropriately. */ 273 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev) 274 { 275 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 276 struct cfg80211_bss *bss; 277 278 ASSERT_WDEV_LOCK(wdev); 279 280 bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel, 281 wdev->conn->params.bssid, 282 wdev->conn->params.ssid, 283 wdev->conn->params.ssid_len, 284 wdev->conn_bss_type, 285 IEEE80211_PRIVACY(wdev->conn->params.privacy)); 286 if (!bss) 287 return NULL; 288 289 memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN); 290 wdev->conn->params.bssid = wdev->conn->bssid; 291 wdev->conn->params.channel = bss->channel; 292 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT; 293 schedule_work(&rdev->conn_work); 294 295 return bss; 296 } 297 298 static void __cfg80211_sme_scan_done(struct net_device *dev) 299 { 300 struct wireless_dev *wdev = dev->ieee80211_ptr; 301 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 302 struct cfg80211_bss *bss; 303 304 ASSERT_WDEV_LOCK(wdev); 305 306 if (!wdev->conn) 307 return; 308 309 if (wdev->conn->state != CFG80211_CONN_SCANNING && 310 wdev->conn->state != CFG80211_CONN_SCAN_AGAIN) 311 return; 312 313 bss = cfg80211_get_conn_bss(wdev); 314 if (bss) 315 cfg80211_put_bss(&rdev->wiphy, bss); 316 else 317 schedule_work(&rdev->conn_work); 318 } 319 320 void cfg80211_sme_scan_done(struct net_device *dev) 321 { 322 struct wireless_dev *wdev = dev->ieee80211_ptr; 323 324 wdev_lock(wdev); 325 __cfg80211_sme_scan_done(dev); 326 wdev_unlock(wdev); 327 } 328 329 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len) 330 { 331 struct wiphy *wiphy = wdev->wiphy; 332 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 333 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf; 334 u16 status_code = le16_to_cpu(mgmt->u.auth.status_code); 335 336 ASSERT_WDEV_LOCK(wdev); 337 338 if (!wdev->conn || wdev->conn->state == CFG80211_CONN_CONNECTED) 339 return; 340 341 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG && 342 wdev->conn->auto_auth && 343 wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) { 344 /* select automatically between only open, shared, leap */ 345 switch (wdev->conn->params.auth_type) { 346 case NL80211_AUTHTYPE_OPEN_SYSTEM: 347 if (wdev->connect_keys) 348 wdev->conn->params.auth_type = 349 NL80211_AUTHTYPE_SHARED_KEY; 350 else 351 wdev->conn->params.auth_type = 352 NL80211_AUTHTYPE_NETWORK_EAP; 353 break; 354 case NL80211_AUTHTYPE_SHARED_KEY: 355 wdev->conn->params.auth_type = 356 NL80211_AUTHTYPE_NETWORK_EAP; 357 break; 358 default: 359 /* huh? */ 360 wdev->conn->params.auth_type = 361 NL80211_AUTHTYPE_OPEN_SYSTEM; 362 break; 363 } 364 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT; 365 schedule_work(&rdev->conn_work); 366 } else if (status_code != WLAN_STATUS_SUCCESS) { 367 struct cfg80211_connect_resp_params cr; 368 369 memset(&cr, 0, sizeof(cr)); 370 cr.status = status_code; 371 cr.bssid = mgmt->bssid; 372 cr.timeout_reason = NL80211_TIMEOUT_UNSPECIFIED; 373 __cfg80211_connect_result(wdev->netdev, &cr, false); 374 } else if (wdev->conn->state == CFG80211_CONN_AUTHENTICATING) { 375 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT; 376 schedule_work(&rdev->conn_work); 377 } 378 } 379 380 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status) 381 { 382 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 383 384 if (!wdev->conn) 385 return false; 386 387 if (status == WLAN_STATUS_SUCCESS) { 388 wdev->conn->state = CFG80211_CONN_CONNECTED; 389 return false; 390 } 391 392 if (wdev->conn->prev_bssid_valid) { 393 /* 394 * Some stupid APs don't accept reassoc, so we 395 * need to fall back to trying regular assoc; 396 * return true so no event is sent to userspace. 397 */ 398 wdev->conn->prev_bssid_valid = false; 399 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT; 400 schedule_work(&rdev->conn_work); 401 return true; 402 } 403 404 wdev->conn->state = CFG80211_CONN_ASSOC_FAILED; 405 schedule_work(&rdev->conn_work); 406 return false; 407 } 408 409 void cfg80211_sme_deauth(struct wireless_dev *wdev) 410 { 411 cfg80211_sme_free(wdev); 412 } 413 414 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev) 415 { 416 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 417 418 if (!wdev->conn) 419 return; 420 421 wdev->conn->state = CFG80211_CONN_AUTH_FAILED_TIMEOUT; 422 schedule_work(&rdev->conn_work); 423 } 424 425 void cfg80211_sme_disassoc(struct wireless_dev *wdev) 426 { 427 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 428 429 if (!wdev->conn) 430 return; 431 432 wdev->conn->state = CFG80211_CONN_DEAUTH; 433 schedule_work(&rdev->conn_work); 434 } 435 436 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev) 437 { 438 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 439 440 if (!wdev->conn) 441 return; 442 443 wdev->conn->state = CFG80211_CONN_ASSOC_FAILED_TIMEOUT; 444 schedule_work(&rdev->conn_work); 445 } 446 447 void cfg80211_sme_abandon_assoc(struct wireless_dev *wdev) 448 { 449 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 450 451 if (!wdev->conn) 452 return; 453 454 wdev->conn->state = CFG80211_CONN_ABANDON; 455 schedule_work(&rdev->conn_work); 456 } 457 458 static int cfg80211_sme_get_conn_ies(struct wireless_dev *wdev, 459 const u8 *ies, size_t ies_len, 460 const u8 **out_ies, size_t *out_ies_len) 461 { 462 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 463 u8 *buf; 464 size_t offs; 465 466 if (!rdev->wiphy.extended_capabilities_len || 467 (ies && cfg80211_find_ie(WLAN_EID_EXT_CAPABILITY, ies, ies_len))) { 468 *out_ies = kmemdup(ies, ies_len, GFP_KERNEL); 469 if (!*out_ies) 470 return -ENOMEM; 471 *out_ies_len = ies_len; 472 return 0; 473 } 474 475 buf = kmalloc(ies_len + rdev->wiphy.extended_capabilities_len + 2, 476 GFP_KERNEL); 477 if (!buf) 478 return -ENOMEM; 479 480 if (ies_len) { 481 static const u8 before_extcapa[] = { 482 /* not listing IEs expected to be created by driver */ 483 WLAN_EID_RSN, 484 WLAN_EID_QOS_CAPA, 485 WLAN_EID_RRM_ENABLED_CAPABILITIES, 486 WLAN_EID_MOBILITY_DOMAIN, 487 WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 488 WLAN_EID_BSS_COEX_2040, 489 }; 490 491 offs = ieee80211_ie_split(ies, ies_len, before_extcapa, 492 ARRAY_SIZE(before_extcapa), 0); 493 memcpy(buf, ies, offs); 494 /* leave a whole for extended capabilities IE */ 495 memcpy(buf + offs + rdev->wiphy.extended_capabilities_len + 2, 496 ies + offs, ies_len - offs); 497 } else { 498 offs = 0; 499 } 500 501 /* place extended capabilities IE (with only driver capabilities) */ 502 buf[offs] = WLAN_EID_EXT_CAPABILITY; 503 buf[offs + 1] = rdev->wiphy.extended_capabilities_len; 504 memcpy(buf + offs + 2, 505 rdev->wiphy.extended_capabilities, 506 rdev->wiphy.extended_capabilities_len); 507 508 *out_ies = buf; 509 *out_ies_len = ies_len + rdev->wiphy.extended_capabilities_len + 2; 510 511 return 0; 512 } 513 514 static int cfg80211_sme_connect(struct wireless_dev *wdev, 515 struct cfg80211_connect_params *connect, 516 const u8 *prev_bssid) 517 { 518 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 519 struct cfg80211_bss *bss; 520 int err; 521 522 if (!rdev->ops->auth || !rdev->ops->assoc) 523 return -EOPNOTSUPP; 524 525 if (wdev->current_bss) { 526 cfg80211_unhold_bss(wdev->current_bss); 527 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 528 wdev->current_bss = NULL; 529 530 cfg80211_sme_free(wdev); 531 } 532 533 if (WARN_ON(wdev->conn)) 534 return -EINPROGRESS; 535 536 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL); 537 if (!wdev->conn) 538 return -ENOMEM; 539 540 /* 541 * Copy all parameters, and treat explicitly IEs, BSSID, SSID. 542 */ 543 memcpy(&wdev->conn->params, connect, sizeof(*connect)); 544 if (connect->bssid) { 545 wdev->conn->params.bssid = wdev->conn->bssid; 546 memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN); 547 } 548 549 if (cfg80211_sme_get_conn_ies(wdev, connect->ie, connect->ie_len, 550 &wdev->conn->ie, 551 &wdev->conn->params.ie_len)) { 552 kfree(wdev->conn); 553 wdev->conn = NULL; 554 return -ENOMEM; 555 } 556 wdev->conn->params.ie = wdev->conn->ie; 557 558 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) { 559 wdev->conn->auto_auth = true; 560 /* start with open system ... should mostly work */ 561 wdev->conn->params.auth_type = 562 NL80211_AUTHTYPE_OPEN_SYSTEM; 563 } else { 564 wdev->conn->auto_auth = false; 565 } 566 567 wdev->conn->params.ssid = wdev->ssid; 568 wdev->conn->params.ssid_len = wdev->ssid_len; 569 570 /* see if we have the bss already */ 571 bss = cfg80211_get_conn_bss(wdev); 572 573 if (prev_bssid) { 574 memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN); 575 wdev->conn->prev_bssid_valid = true; 576 } 577 578 /* we're good if we have a matching bss struct */ 579 if (bss) { 580 enum nl80211_timeout_reason treason; 581 582 err = cfg80211_conn_do_work(wdev, &treason); 583 cfg80211_put_bss(wdev->wiphy, bss); 584 } else { 585 /* otherwise we'll need to scan for the AP first */ 586 err = cfg80211_conn_scan(wdev); 587 588 /* 589 * If we can't scan right now, then we need to scan again 590 * after the current scan finished, since the parameters 591 * changed (unless we find a good AP anyway). 592 */ 593 if (err == -EBUSY) { 594 err = 0; 595 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN; 596 } 597 } 598 599 if (err) 600 cfg80211_sme_free(wdev); 601 602 return err; 603 } 604 605 static int cfg80211_sme_disconnect(struct wireless_dev *wdev, u16 reason) 606 { 607 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 608 int err; 609 610 if (!wdev->conn) 611 return 0; 612 613 if (!rdev->ops->deauth) 614 return -EOPNOTSUPP; 615 616 if (wdev->conn->state == CFG80211_CONN_SCANNING || 617 wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) { 618 err = 0; 619 goto out; 620 } 621 622 /* wdev->conn->params.bssid must be set if > SCANNING */ 623 err = cfg80211_mlme_deauth(rdev, wdev->netdev, 624 wdev->conn->params.bssid, 625 NULL, 0, reason, false); 626 out: 627 cfg80211_sme_free(wdev); 628 return err; 629 } 630 631 /* 632 * code shared for in-device and software SME 633 */ 634 635 static bool cfg80211_is_all_idle(void) 636 { 637 struct cfg80211_registered_device *rdev; 638 struct wireless_dev *wdev; 639 bool is_all_idle = true; 640 641 /* 642 * All devices must be idle as otherwise if you are actively 643 * scanning some new beacon hints could be learned and would 644 * count as new regulatory hints. 645 */ 646 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 647 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 648 wdev_lock(wdev); 649 if (wdev->conn || wdev->current_bss) 650 is_all_idle = false; 651 wdev_unlock(wdev); 652 } 653 } 654 655 return is_all_idle; 656 } 657 658 static void disconnect_work(struct work_struct *work) 659 { 660 rtnl_lock(); 661 if (cfg80211_is_all_idle()) 662 regulatory_hint_disconnect(); 663 rtnl_unlock(); 664 } 665 666 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work); 667 668 669 /* 670 * API calls for drivers implementing connect/disconnect and 671 * SME event handling 672 */ 673 674 /* This method must consume bss one way or another */ 675 void __cfg80211_connect_result(struct net_device *dev, 676 struct cfg80211_connect_resp_params *cr, 677 bool wextev) 678 { 679 struct wireless_dev *wdev = dev->ieee80211_ptr; 680 const u8 *country_ie; 681 #ifdef CONFIG_CFG80211_WEXT 682 union iwreq_data wrqu; 683 #endif 684 685 ASSERT_WDEV_LOCK(wdev); 686 687 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION && 688 wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) { 689 cfg80211_put_bss(wdev->wiphy, cr->bss); 690 return; 691 } 692 693 nl80211_send_connect_result(wiphy_to_rdev(wdev->wiphy), dev, cr, 694 GFP_KERNEL); 695 696 #ifdef CONFIG_CFG80211_WEXT 697 if (wextev) { 698 if (cr->req_ie && cr->status == WLAN_STATUS_SUCCESS) { 699 memset(&wrqu, 0, sizeof(wrqu)); 700 wrqu.data.length = cr->req_ie_len; 701 wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, 702 cr->req_ie); 703 } 704 705 if (cr->resp_ie && cr->status == WLAN_STATUS_SUCCESS) { 706 memset(&wrqu, 0, sizeof(wrqu)); 707 wrqu.data.length = cr->resp_ie_len; 708 wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, 709 cr->resp_ie); 710 } 711 712 memset(&wrqu, 0, sizeof(wrqu)); 713 wrqu.ap_addr.sa_family = ARPHRD_ETHER; 714 if (cr->bssid && cr->status == WLAN_STATUS_SUCCESS) { 715 memcpy(wrqu.ap_addr.sa_data, cr->bssid, ETH_ALEN); 716 memcpy(wdev->wext.prev_bssid, cr->bssid, ETH_ALEN); 717 wdev->wext.prev_bssid_valid = true; 718 } 719 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL); 720 } 721 #endif 722 723 if (!cr->bss && (cr->status == WLAN_STATUS_SUCCESS)) { 724 WARN_ON_ONCE(!wiphy_to_rdev(wdev->wiphy)->ops->connect); 725 cr->bss = cfg80211_get_bss(wdev->wiphy, NULL, cr->bssid, 726 wdev->ssid, wdev->ssid_len, 727 wdev->conn_bss_type, 728 IEEE80211_PRIVACY_ANY); 729 if (cr->bss) 730 cfg80211_hold_bss(bss_from_pub(cr->bss)); 731 } 732 733 if (wdev->current_bss) { 734 cfg80211_unhold_bss(wdev->current_bss); 735 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 736 wdev->current_bss = NULL; 737 } 738 739 if (cr->status != WLAN_STATUS_SUCCESS) { 740 kzfree(wdev->connect_keys); 741 wdev->connect_keys = NULL; 742 wdev->ssid_len = 0; 743 wdev->conn_owner_nlportid = 0; 744 if (cr->bss) { 745 cfg80211_unhold_bss(bss_from_pub(cr->bss)); 746 cfg80211_put_bss(wdev->wiphy, cr->bss); 747 } 748 cfg80211_sme_free(wdev); 749 return; 750 } 751 752 if (WARN_ON(!cr->bss)) 753 return; 754 755 wdev->current_bss = bss_from_pub(cr->bss); 756 757 if (!(wdev->wiphy->flags & WIPHY_FLAG_HAS_STATIC_WEP)) 758 cfg80211_upload_connect_keys(wdev); 759 760 rcu_read_lock(); 761 country_ie = ieee80211_bss_get_ie(cr->bss, WLAN_EID_COUNTRY); 762 if (!country_ie) { 763 rcu_read_unlock(); 764 return; 765 } 766 767 country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC); 768 rcu_read_unlock(); 769 770 if (!country_ie) 771 return; 772 773 /* 774 * ieee80211_bss_get_ie() ensures we can access: 775 * - country_ie + 2, the start of the country ie data, and 776 * - and country_ie[1] which is the IE length 777 */ 778 regulatory_hint_country_ie(wdev->wiphy, cr->bss->channel->band, 779 country_ie + 2, country_ie[1]); 780 kfree(country_ie); 781 } 782 783 /* Consumes bss object one way or another */ 784 void cfg80211_connect_done(struct net_device *dev, 785 struct cfg80211_connect_resp_params *params, 786 gfp_t gfp) 787 { 788 struct wireless_dev *wdev = dev->ieee80211_ptr; 789 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 790 struct cfg80211_event *ev; 791 unsigned long flags; 792 u8 *next; 793 794 if (params->bss) { 795 /* Make sure the bss entry provided by the driver is valid. */ 796 struct cfg80211_internal_bss *ibss = bss_from_pub(params->bss); 797 798 if (WARN_ON(list_empty(&ibss->list))) { 799 cfg80211_put_bss(wdev->wiphy, params->bss); 800 return; 801 } 802 } 803 804 ev = kzalloc(sizeof(*ev) + (params->bssid ? ETH_ALEN : 0) + 805 params->req_ie_len + params->resp_ie_len + 806 params->fils_kek_len + params->pmk_len + 807 (params->pmkid ? WLAN_PMKID_LEN : 0), gfp); 808 if (!ev) { 809 cfg80211_put_bss(wdev->wiphy, params->bss); 810 return; 811 } 812 813 ev->type = EVENT_CONNECT_RESULT; 814 next = ((u8 *)ev) + sizeof(*ev); 815 if (params->bssid) { 816 ev->cr.bssid = next; 817 memcpy((void *)ev->cr.bssid, params->bssid, ETH_ALEN); 818 next += ETH_ALEN; 819 } 820 if (params->req_ie_len) { 821 ev->cr.req_ie = next; 822 ev->cr.req_ie_len = params->req_ie_len; 823 memcpy((void *)ev->cr.req_ie, params->req_ie, 824 params->req_ie_len); 825 next += params->req_ie_len; 826 } 827 if (params->resp_ie_len) { 828 ev->cr.resp_ie = next; 829 ev->cr.resp_ie_len = params->resp_ie_len; 830 memcpy((void *)ev->cr.resp_ie, params->resp_ie, 831 params->resp_ie_len); 832 next += params->resp_ie_len; 833 } 834 if (params->fils_kek_len) { 835 ev->cr.fils_kek = next; 836 ev->cr.fils_kek_len = params->fils_kek_len; 837 memcpy((void *)ev->cr.fils_kek, params->fils_kek, 838 params->fils_kek_len); 839 next += params->fils_kek_len; 840 } 841 if (params->pmk_len) { 842 ev->cr.pmk = next; 843 ev->cr.pmk_len = params->pmk_len; 844 memcpy((void *)ev->cr.pmk, params->pmk, params->pmk_len); 845 next += params->pmk_len; 846 } 847 if (params->pmkid) { 848 ev->cr.pmkid = next; 849 memcpy((void *)ev->cr.pmkid, params->pmkid, WLAN_PMKID_LEN); 850 next += WLAN_PMKID_LEN; 851 } 852 ev->cr.update_erp_next_seq_num = params->update_erp_next_seq_num; 853 if (params->update_erp_next_seq_num) 854 ev->cr.fils_erp_next_seq_num = params->fils_erp_next_seq_num; 855 if (params->bss) 856 cfg80211_hold_bss(bss_from_pub(params->bss)); 857 ev->cr.bss = params->bss; 858 ev->cr.status = params->status; 859 ev->cr.timeout_reason = params->timeout_reason; 860 861 spin_lock_irqsave(&wdev->event_lock, flags); 862 list_add_tail(&ev->list, &wdev->event_list); 863 spin_unlock_irqrestore(&wdev->event_lock, flags); 864 queue_work(cfg80211_wq, &rdev->event_work); 865 } 866 EXPORT_SYMBOL(cfg80211_connect_done); 867 868 /* Consumes bss object one way or another */ 869 void __cfg80211_roamed(struct wireless_dev *wdev, 870 struct cfg80211_roam_info *info) 871 { 872 #ifdef CONFIG_CFG80211_WEXT 873 union iwreq_data wrqu; 874 #endif 875 ASSERT_WDEV_LOCK(wdev); 876 877 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION && 878 wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) 879 goto out; 880 881 if (WARN_ON(!wdev->current_bss)) 882 goto out; 883 884 cfg80211_unhold_bss(wdev->current_bss); 885 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 886 wdev->current_bss = NULL; 887 888 if (WARN_ON(!info->bss)) 889 return; 890 891 cfg80211_hold_bss(bss_from_pub(info->bss)); 892 wdev->current_bss = bss_from_pub(info->bss); 893 894 nl80211_send_roamed(wiphy_to_rdev(wdev->wiphy), 895 wdev->netdev, info, GFP_KERNEL); 896 897 #ifdef CONFIG_CFG80211_WEXT 898 if (info->req_ie) { 899 memset(&wrqu, 0, sizeof(wrqu)); 900 wrqu.data.length = info->req_ie_len; 901 wireless_send_event(wdev->netdev, IWEVASSOCREQIE, 902 &wrqu, info->req_ie); 903 } 904 905 if (info->resp_ie) { 906 memset(&wrqu, 0, sizeof(wrqu)); 907 wrqu.data.length = info->resp_ie_len; 908 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE, 909 &wrqu, info->resp_ie); 910 } 911 912 memset(&wrqu, 0, sizeof(wrqu)); 913 wrqu.ap_addr.sa_family = ARPHRD_ETHER; 914 memcpy(wrqu.ap_addr.sa_data, info->bss->bssid, ETH_ALEN); 915 memcpy(wdev->wext.prev_bssid, info->bss->bssid, ETH_ALEN); 916 wdev->wext.prev_bssid_valid = true; 917 wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL); 918 #endif 919 920 return; 921 out: 922 cfg80211_put_bss(wdev->wiphy, info->bss); 923 } 924 925 /* Consumes info->bss object one way or another */ 926 void cfg80211_roamed(struct net_device *dev, struct cfg80211_roam_info *info, 927 gfp_t gfp) 928 { 929 struct wireless_dev *wdev = dev->ieee80211_ptr; 930 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 931 struct cfg80211_event *ev; 932 unsigned long flags; 933 934 if (!info->bss) { 935 info->bss = cfg80211_get_bss(wdev->wiphy, info->channel, 936 info->bssid, wdev->ssid, 937 wdev->ssid_len, 938 wdev->conn_bss_type, 939 IEEE80211_PRIVACY_ANY); 940 } 941 942 if (WARN_ON(!info->bss)) 943 return; 944 945 ev = kzalloc(sizeof(*ev) + info->req_ie_len + info->resp_ie_len, gfp); 946 if (!ev) { 947 cfg80211_put_bss(wdev->wiphy, info->bss); 948 return; 949 } 950 951 ev->type = EVENT_ROAMED; 952 ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev); 953 ev->rm.req_ie_len = info->req_ie_len; 954 memcpy((void *)ev->rm.req_ie, info->req_ie, info->req_ie_len); 955 ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + info->req_ie_len; 956 ev->rm.resp_ie_len = info->resp_ie_len; 957 memcpy((void *)ev->rm.resp_ie, info->resp_ie, info->resp_ie_len); 958 ev->rm.bss = info->bss; 959 960 spin_lock_irqsave(&wdev->event_lock, flags); 961 list_add_tail(&ev->list, &wdev->event_list); 962 spin_unlock_irqrestore(&wdev->event_lock, flags); 963 queue_work(cfg80211_wq, &rdev->event_work); 964 } 965 EXPORT_SYMBOL(cfg80211_roamed); 966 967 void __cfg80211_port_authorized(struct wireless_dev *wdev, const u8 *bssid) 968 { 969 ASSERT_WDEV_LOCK(wdev); 970 971 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION)) 972 return; 973 974 if (WARN_ON(!wdev->current_bss) || 975 WARN_ON(!ether_addr_equal(wdev->current_bss->pub.bssid, bssid))) 976 return; 977 978 nl80211_send_port_authorized(wiphy_to_rdev(wdev->wiphy), wdev->netdev, 979 bssid); 980 } 981 982 void cfg80211_port_authorized(struct net_device *dev, const u8 *bssid, 983 gfp_t gfp) 984 { 985 struct wireless_dev *wdev = dev->ieee80211_ptr; 986 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 987 struct cfg80211_event *ev; 988 unsigned long flags; 989 990 if (WARN_ON(!bssid)) 991 return; 992 993 ev = kzalloc(sizeof(*ev), gfp); 994 if (!ev) 995 return; 996 997 ev->type = EVENT_PORT_AUTHORIZED; 998 memcpy(ev->pa.bssid, bssid, ETH_ALEN); 999 1000 /* 1001 * Use the wdev event list so that if there are pending 1002 * connected/roamed events, they will be reported first. 1003 */ 1004 spin_lock_irqsave(&wdev->event_lock, flags); 1005 list_add_tail(&ev->list, &wdev->event_list); 1006 spin_unlock_irqrestore(&wdev->event_lock, flags); 1007 queue_work(cfg80211_wq, &rdev->event_work); 1008 } 1009 EXPORT_SYMBOL(cfg80211_port_authorized); 1010 1011 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie, 1012 size_t ie_len, u16 reason, bool from_ap) 1013 { 1014 struct wireless_dev *wdev = dev->ieee80211_ptr; 1015 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1016 int i; 1017 #ifdef CONFIG_CFG80211_WEXT 1018 union iwreq_data wrqu; 1019 #endif 1020 1021 ASSERT_WDEV_LOCK(wdev); 1022 1023 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION && 1024 wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) 1025 return; 1026 1027 if (wdev->current_bss) { 1028 cfg80211_unhold_bss(wdev->current_bss); 1029 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub); 1030 } 1031 1032 wdev->current_bss = NULL; 1033 wdev->ssid_len = 0; 1034 wdev->conn_owner_nlportid = 0; 1035 1036 nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap); 1037 1038 /* stop critical protocol if supported */ 1039 if (rdev->ops->crit_proto_stop && rdev->crit_proto_nlportid) { 1040 rdev->crit_proto_nlportid = 0; 1041 rdev_crit_proto_stop(rdev, wdev); 1042 } 1043 1044 /* 1045 * Delete all the keys ... pairwise keys can't really 1046 * exist any more anyway, but default keys might. 1047 */ 1048 if (rdev->ops->del_key) 1049 for (i = 0; i < 6; i++) 1050 rdev_del_key(rdev, dev, i, false, NULL); 1051 1052 rdev_set_qos_map(rdev, dev, NULL); 1053 1054 #ifdef CONFIG_CFG80211_WEXT 1055 memset(&wrqu, 0, sizeof(wrqu)); 1056 wrqu.ap_addr.sa_family = ARPHRD_ETHER; 1057 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL); 1058 wdev->wext.connect.ssid_len = 0; 1059 #endif 1060 1061 schedule_work(&cfg80211_disconnect_work); 1062 } 1063 1064 void cfg80211_disconnected(struct net_device *dev, u16 reason, 1065 const u8 *ie, size_t ie_len, 1066 bool locally_generated, gfp_t gfp) 1067 { 1068 struct wireless_dev *wdev = dev->ieee80211_ptr; 1069 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1070 struct cfg80211_event *ev; 1071 unsigned long flags; 1072 1073 ev = kzalloc(sizeof(*ev) + ie_len, gfp); 1074 if (!ev) 1075 return; 1076 1077 ev->type = EVENT_DISCONNECTED; 1078 ev->dc.ie = ((u8 *)ev) + sizeof(*ev); 1079 ev->dc.ie_len = ie_len; 1080 memcpy((void *)ev->dc.ie, ie, ie_len); 1081 ev->dc.reason = reason; 1082 ev->dc.locally_generated = locally_generated; 1083 1084 spin_lock_irqsave(&wdev->event_lock, flags); 1085 list_add_tail(&ev->list, &wdev->event_list); 1086 spin_unlock_irqrestore(&wdev->event_lock, flags); 1087 queue_work(cfg80211_wq, &rdev->event_work); 1088 } 1089 EXPORT_SYMBOL(cfg80211_disconnected); 1090 1091 /* 1092 * API calls for nl80211/wext compatibility code 1093 */ 1094 int cfg80211_connect(struct cfg80211_registered_device *rdev, 1095 struct net_device *dev, 1096 struct cfg80211_connect_params *connect, 1097 struct cfg80211_cached_keys *connkeys, 1098 const u8 *prev_bssid) 1099 { 1100 struct wireless_dev *wdev = dev->ieee80211_ptr; 1101 int err; 1102 1103 ASSERT_WDEV_LOCK(wdev); 1104 1105 /* 1106 * If we have an ssid_len, we're trying to connect or are 1107 * already connected, so reject a new SSID unless it's the 1108 * same (which is the case for re-association.) 1109 */ 1110 if (wdev->ssid_len && 1111 (wdev->ssid_len != connect->ssid_len || 1112 memcmp(wdev->ssid, connect->ssid, wdev->ssid_len))) 1113 return -EALREADY; 1114 1115 /* 1116 * If connected, reject (re-)association unless prev_bssid 1117 * matches the current BSSID. 1118 */ 1119 if (wdev->current_bss) { 1120 if (!prev_bssid) 1121 return -EALREADY; 1122 if (!ether_addr_equal(prev_bssid, wdev->current_bss->pub.bssid)) 1123 return -ENOTCONN; 1124 } 1125 1126 /* 1127 * Reject if we're in the process of connecting with WEP, 1128 * this case isn't very interesting and trying to handle 1129 * it would make the code much more complex. 1130 */ 1131 if (wdev->connect_keys) 1132 return -EINPROGRESS; 1133 1134 cfg80211_oper_and_ht_capa(&connect->ht_capa_mask, 1135 rdev->wiphy.ht_capa_mod_mask); 1136 1137 if (connkeys && connkeys->def >= 0) { 1138 int idx; 1139 u32 cipher; 1140 1141 idx = connkeys->def; 1142 cipher = connkeys->params[idx].cipher; 1143 /* If given a WEP key we may need it for shared key auth */ 1144 if (cipher == WLAN_CIPHER_SUITE_WEP40 || 1145 cipher == WLAN_CIPHER_SUITE_WEP104) { 1146 connect->key_idx = idx; 1147 connect->key = connkeys->params[idx].key; 1148 connect->key_len = connkeys->params[idx].key_len; 1149 1150 /* 1151 * If ciphers are not set (e.g. when going through 1152 * iwconfig), we have to set them appropriately here. 1153 */ 1154 if (connect->crypto.cipher_group == 0) 1155 connect->crypto.cipher_group = cipher; 1156 1157 if (connect->crypto.n_ciphers_pairwise == 0) { 1158 connect->crypto.n_ciphers_pairwise = 1; 1159 connect->crypto.ciphers_pairwise[0] = cipher; 1160 } 1161 } 1162 1163 connect->crypto.wep_keys = connkeys->params; 1164 connect->crypto.wep_tx_key = connkeys->def; 1165 } else { 1166 if (WARN_ON(connkeys)) 1167 return -EINVAL; 1168 } 1169 1170 wdev->connect_keys = connkeys; 1171 memcpy(wdev->ssid, connect->ssid, connect->ssid_len); 1172 wdev->ssid_len = connect->ssid_len; 1173 1174 wdev->conn_bss_type = connect->pbss ? IEEE80211_BSS_TYPE_PBSS : 1175 IEEE80211_BSS_TYPE_ESS; 1176 1177 if (!rdev->ops->connect) 1178 err = cfg80211_sme_connect(wdev, connect, prev_bssid); 1179 else 1180 err = rdev_connect(rdev, dev, connect); 1181 1182 if (err) { 1183 wdev->connect_keys = NULL; 1184 /* 1185 * This could be reassoc getting refused, don't clear 1186 * ssid_len in that case. 1187 */ 1188 if (!wdev->current_bss) 1189 wdev->ssid_len = 0; 1190 return err; 1191 } 1192 1193 return 0; 1194 } 1195 1196 int cfg80211_disconnect(struct cfg80211_registered_device *rdev, 1197 struct net_device *dev, u16 reason, bool wextev) 1198 { 1199 struct wireless_dev *wdev = dev->ieee80211_ptr; 1200 int err = 0; 1201 1202 ASSERT_WDEV_LOCK(wdev); 1203 1204 kzfree(wdev->connect_keys); 1205 wdev->connect_keys = NULL; 1206 1207 wdev->conn_owner_nlportid = 0; 1208 1209 if (wdev->conn) 1210 err = cfg80211_sme_disconnect(wdev, reason); 1211 else if (!rdev->ops->disconnect) 1212 cfg80211_mlme_down(rdev, dev); 1213 else if (wdev->ssid_len) 1214 err = rdev_disconnect(rdev, dev, reason); 1215 1216 /* 1217 * Clear ssid_len unless we actually were fully connected, 1218 * in which case cfg80211_disconnected() will take care of 1219 * this later. 1220 */ 1221 if (!wdev->current_bss) 1222 wdev->ssid_len = 0; 1223 1224 return err; 1225 } 1226 1227 /* 1228 * Used to clean up after the connection / connection attempt owner socket 1229 * disconnects 1230 */ 1231 void cfg80211_autodisconnect_wk(struct work_struct *work) 1232 { 1233 struct wireless_dev *wdev = 1234 container_of(work, struct wireless_dev, disconnect_wk); 1235 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 1236 1237 wdev_lock(wdev); 1238 1239 if (wdev->conn_owner_nlportid) { 1240 /* 1241 * Use disconnect_bssid if still connecting and ops->disconnect 1242 * not implemented. Otherwise we can use cfg80211_disconnect. 1243 */ 1244 if (rdev->ops->disconnect || wdev->current_bss) 1245 cfg80211_disconnect(rdev, wdev->netdev, 1246 WLAN_REASON_DEAUTH_LEAVING, true); 1247 else 1248 cfg80211_mlme_deauth(rdev, wdev->netdev, 1249 wdev->disconnect_bssid, NULL, 0, 1250 WLAN_REASON_DEAUTH_LEAVING, false); 1251 } 1252 1253 wdev_unlock(wdev); 1254 } 1255