1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * cfg80211 MLME SAP interface 4 * 5 * Copyright (c) 2009, Jouni Malinen <j@w1.fi> 6 * Copyright (c) 2015 Intel Deutschland GmbH 7 * Copyright (C) 2019-2020, 2022 Intel Corporation 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/etherdevice.h> 13 #include <linux/netdevice.h> 14 #include <linux/nl80211.h> 15 #include <linux/slab.h> 16 #include <linux/wireless.h> 17 #include <net/cfg80211.h> 18 #include <net/iw_handler.h> 19 #include "core.h" 20 #include "nl80211.h" 21 #include "rdev-ops.h" 22 23 24 void cfg80211_rx_assoc_resp(struct net_device *dev, 25 struct cfg80211_rx_assoc_resp *data) 26 { 27 struct wireless_dev *wdev = dev->ieee80211_ptr; 28 struct wiphy *wiphy = wdev->wiphy; 29 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 30 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)data->buf; 31 struct cfg80211_connect_resp_params cr = { 32 .timeout_reason = NL80211_TIMEOUT_UNSPECIFIED, 33 .req_ie = data->req_ies, 34 .req_ie_len = data->req_ies_len, 35 .resp_ie = mgmt->u.assoc_resp.variable, 36 .resp_ie_len = data->len - 37 offsetof(struct ieee80211_mgmt, 38 u.assoc_resp.variable), 39 .status = le16_to_cpu(mgmt->u.assoc_resp.status_code), 40 .ap_mld_addr = data->ap_mld_addr, 41 }; 42 unsigned int link_id; 43 44 for (link_id = 0; link_id < ARRAY_SIZE(data->links); link_id++) { 45 cr.links[link_id].status = data->links[link_id].status; 46 WARN_ON_ONCE(cr.links[link_id].status != WLAN_STATUS_SUCCESS && 47 (!cr.ap_mld_addr || !cr.links[link_id].bss)); 48 49 cr.links[link_id].bss = data->links[link_id].bss; 50 if (!cr.links[link_id].bss) 51 continue; 52 cr.links[link_id].bssid = data->links[link_id].bss->bssid; 53 cr.links[link_id].addr = data->links[link_id].addr; 54 /* need to have local link addresses for MLO connections */ 55 WARN_ON(cr.ap_mld_addr && 56 !is_valid_ether_addr(cr.links[link_id].addr)); 57 58 BUG_ON(!cr.links[link_id].bss->channel); 59 60 if (cr.links[link_id].bss->channel->band == NL80211_BAND_S1GHZ) { 61 WARN_ON(link_id); 62 cr.resp_ie = (u8 *)&mgmt->u.s1g_assoc_resp.variable; 63 cr.resp_ie_len = data->len - 64 offsetof(struct ieee80211_mgmt, 65 u.s1g_assoc_resp.variable); 66 } 67 68 if (cr.ap_mld_addr) 69 cr.valid_links |= BIT(link_id); 70 } 71 72 trace_cfg80211_send_rx_assoc(dev, data); 73 74 /* 75 * This is a bit of a hack, we don't notify userspace of 76 * a (re-)association reply if we tried to send a reassoc 77 * and got a reject -- we only try again with an assoc 78 * frame instead of reassoc. 79 */ 80 if (cfg80211_sme_rx_assoc_resp(wdev, cr.status)) { 81 for (link_id = 0; link_id < ARRAY_SIZE(data->links); link_id++) { 82 struct cfg80211_bss *bss = data->links[link_id].bss; 83 84 if (!bss) 85 continue; 86 87 cfg80211_unhold_bss(bss_from_pub(bss)); 88 cfg80211_put_bss(wiphy, bss); 89 } 90 return; 91 } 92 93 nl80211_send_rx_assoc(rdev, dev, data); 94 /* update current_bss etc., consumes the bss reference */ 95 __cfg80211_connect_result(dev, &cr, cr.status == WLAN_STATUS_SUCCESS); 96 } 97 EXPORT_SYMBOL(cfg80211_rx_assoc_resp); 98 99 static void cfg80211_process_auth(struct wireless_dev *wdev, 100 const u8 *buf, size_t len) 101 { 102 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 103 104 nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL); 105 cfg80211_sme_rx_auth(wdev, buf, len); 106 } 107 108 static void cfg80211_process_deauth(struct wireless_dev *wdev, 109 const u8 *buf, size_t len, 110 bool reconnect) 111 { 112 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 113 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf; 114 const u8 *bssid = mgmt->bssid; 115 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 116 bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr); 117 118 nl80211_send_deauth(rdev, wdev->netdev, buf, len, reconnect, GFP_KERNEL); 119 120 if (!wdev->connected || !ether_addr_equal(wdev->u.client.connected_addr, bssid)) 121 return; 122 123 __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap); 124 cfg80211_sme_deauth(wdev); 125 } 126 127 static void cfg80211_process_disassoc(struct wireless_dev *wdev, 128 const u8 *buf, size_t len, 129 bool reconnect) 130 { 131 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 132 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf; 133 const u8 *bssid = mgmt->bssid; 134 u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 135 bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr); 136 137 nl80211_send_disassoc(rdev, wdev->netdev, buf, len, reconnect, 138 GFP_KERNEL); 139 140 if (WARN_ON(!wdev->connected || 141 !ether_addr_equal(wdev->u.client.connected_addr, bssid))) 142 return; 143 144 __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap); 145 cfg80211_sme_disassoc(wdev); 146 } 147 148 void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len) 149 { 150 struct wireless_dev *wdev = dev->ieee80211_ptr; 151 struct ieee80211_mgmt *mgmt = (void *)buf; 152 153 ASSERT_WDEV_LOCK(wdev); 154 155 trace_cfg80211_rx_mlme_mgmt(dev, buf, len); 156 157 if (WARN_ON(len < 2)) 158 return; 159 160 if (ieee80211_is_auth(mgmt->frame_control)) 161 cfg80211_process_auth(wdev, buf, len); 162 else if (ieee80211_is_deauth(mgmt->frame_control)) 163 cfg80211_process_deauth(wdev, buf, len, false); 164 else if (ieee80211_is_disassoc(mgmt->frame_control)) 165 cfg80211_process_disassoc(wdev, buf, len, false); 166 } 167 EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt); 168 169 void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr) 170 { 171 struct wireless_dev *wdev = dev->ieee80211_ptr; 172 struct wiphy *wiphy = wdev->wiphy; 173 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 174 175 trace_cfg80211_send_auth_timeout(dev, addr); 176 177 nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL); 178 cfg80211_sme_auth_timeout(wdev); 179 } 180 EXPORT_SYMBOL(cfg80211_auth_timeout); 181 182 void cfg80211_assoc_failure(struct net_device *dev, 183 struct cfg80211_assoc_failure *data) 184 { 185 struct wireless_dev *wdev = dev->ieee80211_ptr; 186 struct wiphy *wiphy = wdev->wiphy; 187 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 188 const u8 *addr = data->ap_mld_addr ?: data->bss[0]->bssid; 189 int i; 190 191 trace_cfg80211_send_assoc_failure(dev, data); 192 193 if (data->timeout) { 194 nl80211_send_assoc_timeout(rdev, dev, addr, GFP_KERNEL); 195 cfg80211_sme_assoc_timeout(wdev); 196 } else { 197 cfg80211_sme_abandon_assoc(wdev); 198 } 199 200 for (i = 0; i < ARRAY_SIZE(data->bss); i++) { 201 struct cfg80211_bss *bss = data->bss[i]; 202 203 if (!bss) 204 continue; 205 206 cfg80211_unhold_bss(bss_from_pub(bss)); 207 cfg80211_put_bss(wiphy, bss); 208 } 209 } 210 EXPORT_SYMBOL(cfg80211_assoc_failure); 211 212 void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len, 213 bool reconnect) 214 { 215 struct wireless_dev *wdev = dev->ieee80211_ptr; 216 struct ieee80211_mgmt *mgmt = (void *)buf; 217 218 ASSERT_WDEV_LOCK(wdev); 219 220 trace_cfg80211_tx_mlme_mgmt(dev, buf, len, reconnect); 221 222 if (WARN_ON(len < 2)) 223 return; 224 225 if (ieee80211_is_deauth(mgmt->frame_control)) 226 cfg80211_process_deauth(wdev, buf, len, reconnect); 227 else 228 cfg80211_process_disassoc(wdev, buf, len, reconnect); 229 } 230 EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt); 231 232 void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr, 233 enum nl80211_key_type key_type, int key_id, 234 const u8 *tsc, gfp_t gfp) 235 { 236 struct wiphy *wiphy = dev->ieee80211_ptr->wiphy; 237 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 238 #ifdef CONFIG_CFG80211_WEXT 239 union iwreq_data wrqu; 240 char *buf = kmalloc(128, gfp); 241 242 if (buf) { 243 sprintf(buf, "MLME-MICHAELMICFAILURE.indication(" 244 "keyid=%d %scast addr=%pM)", key_id, 245 key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni", 246 addr); 247 memset(&wrqu, 0, sizeof(wrqu)); 248 wrqu.data.length = strlen(buf); 249 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf); 250 kfree(buf); 251 } 252 #endif 253 254 trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc); 255 nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp); 256 } 257 EXPORT_SYMBOL(cfg80211_michael_mic_failure); 258 259 /* some MLME handling for userspace SME */ 260 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev, 261 struct net_device *dev, 262 struct cfg80211_auth_request *req) 263 { 264 struct wireless_dev *wdev = dev->ieee80211_ptr; 265 266 ASSERT_WDEV_LOCK(wdev); 267 268 if (!req->bss) 269 return -ENOENT; 270 271 if (req->link_id >= 0 && 272 !(wdev->wiphy->flags & WIPHY_FLAG_SUPPORTS_MLO)) 273 return -EINVAL; 274 275 if (req->auth_type == NL80211_AUTHTYPE_SHARED_KEY) { 276 if (!req->key || !req->key_len || 277 req->key_idx < 0 || req->key_idx > 3) 278 return -EINVAL; 279 } 280 281 if (wdev->connected && 282 ether_addr_equal(req->bss->bssid, wdev->u.client.connected_addr)) 283 return -EALREADY; 284 285 if (ether_addr_equal(req->bss->bssid, dev->dev_addr) || 286 (req->link_id >= 0 && 287 ether_addr_equal(req->ap_mld_addr, dev->dev_addr))) 288 return -EINVAL; 289 290 return rdev_auth(rdev, dev, req); 291 } 292 293 /* Do a logical ht_capa &= ht_capa_mask. */ 294 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa, 295 const struct ieee80211_ht_cap *ht_capa_mask) 296 { 297 int i; 298 u8 *p1, *p2; 299 if (!ht_capa_mask) { 300 memset(ht_capa, 0, sizeof(*ht_capa)); 301 return; 302 } 303 304 p1 = (u8*)(ht_capa); 305 p2 = (u8*)(ht_capa_mask); 306 for (i = 0; i < sizeof(*ht_capa); i++) 307 p1[i] &= p2[i]; 308 } 309 310 /* Do a logical vht_capa &= vht_capa_mask. */ 311 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa, 312 const struct ieee80211_vht_cap *vht_capa_mask) 313 { 314 int i; 315 u8 *p1, *p2; 316 if (!vht_capa_mask) { 317 memset(vht_capa, 0, sizeof(*vht_capa)); 318 return; 319 } 320 321 p1 = (u8*)(vht_capa); 322 p2 = (u8*)(vht_capa_mask); 323 for (i = 0; i < sizeof(*vht_capa); i++) 324 p1[i] &= p2[i]; 325 } 326 327 /* Note: caller must cfg80211_put_bss() regardless of result */ 328 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev, 329 struct net_device *dev, 330 struct cfg80211_assoc_request *req) 331 { 332 struct wireless_dev *wdev = dev->ieee80211_ptr; 333 int err, i, j; 334 335 ASSERT_WDEV_LOCK(wdev); 336 337 for (i = 1; i < ARRAY_SIZE(req->links); i++) { 338 if (!req->links[i].bss) 339 continue; 340 for (j = 0; j < i; j++) { 341 if (req->links[i].bss == req->links[j].bss) 342 return -EINVAL; 343 } 344 345 if (ether_addr_equal(req->links[i].bss->bssid, dev->dev_addr)) 346 return -EINVAL; 347 } 348 349 if (wdev->connected && 350 (!req->prev_bssid || 351 !ether_addr_equal(wdev->u.client.connected_addr, req->prev_bssid))) 352 return -EALREADY; 353 354 if ((req->bss && ether_addr_equal(req->bss->bssid, dev->dev_addr)) || 355 (req->link_id >= 0 && 356 ether_addr_equal(req->ap_mld_addr, dev->dev_addr))) 357 return -EINVAL; 358 359 cfg80211_oper_and_ht_capa(&req->ht_capa_mask, 360 rdev->wiphy.ht_capa_mod_mask); 361 cfg80211_oper_and_vht_capa(&req->vht_capa_mask, 362 rdev->wiphy.vht_capa_mod_mask); 363 364 err = rdev_assoc(rdev, dev, req); 365 if (!err) { 366 int link_id; 367 368 if (req->bss) { 369 cfg80211_ref_bss(&rdev->wiphy, req->bss); 370 cfg80211_hold_bss(bss_from_pub(req->bss)); 371 } 372 373 for (link_id = 0; link_id < ARRAY_SIZE(req->links); link_id++) { 374 if (!req->links[link_id].bss) 375 continue; 376 cfg80211_ref_bss(&rdev->wiphy, req->links[link_id].bss); 377 cfg80211_hold_bss(bss_from_pub(req->links[link_id].bss)); 378 } 379 } 380 return err; 381 } 382 383 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev, 384 struct net_device *dev, const u8 *bssid, 385 const u8 *ie, int ie_len, u16 reason, 386 bool local_state_change) 387 { 388 struct wireless_dev *wdev = dev->ieee80211_ptr; 389 struct cfg80211_deauth_request req = { 390 .bssid = bssid, 391 .reason_code = reason, 392 .ie = ie, 393 .ie_len = ie_len, 394 .local_state_change = local_state_change, 395 }; 396 397 ASSERT_WDEV_LOCK(wdev); 398 399 if (local_state_change && 400 (!wdev->connected || 401 !ether_addr_equal(wdev->u.client.connected_addr, bssid))) 402 return 0; 403 404 if (ether_addr_equal(wdev->disconnect_bssid, bssid) || 405 (wdev->connected && 406 ether_addr_equal(wdev->u.client.connected_addr, bssid))) 407 wdev->conn_owner_nlportid = 0; 408 409 return rdev_deauth(rdev, dev, &req); 410 } 411 412 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev, 413 struct net_device *dev, const u8 *ap_addr, 414 const u8 *ie, int ie_len, u16 reason, 415 bool local_state_change) 416 { 417 struct wireless_dev *wdev = dev->ieee80211_ptr; 418 struct cfg80211_disassoc_request req = { 419 .reason_code = reason, 420 .local_state_change = local_state_change, 421 .ie = ie, 422 .ie_len = ie_len, 423 .ap_addr = ap_addr, 424 }; 425 int err; 426 427 ASSERT_WDEV_LOCK(wdev); 428 429 if (!wdev->connected) 430 return -ENOTCONN; 431 432 if (memcmp(wdev->u.client.connected_addr, ap_addr, ETH_ALEN)) 433 return -ENOTCONN; 434 435 err = rdev_disassoc(rdev, dev, &req); 436 if (err) 437 return err; 438 439 /* driver should have reported the disassoc */ 440 WARN_ON(wdev->connected); 441 return 0; 442 } 443 444 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev, 445 struct net_device *dev) 446 { 447 struct wireless_dev *wdev = dev->ieee80211_ptr; 448 u8 bssid[ETH_ALEN]; 449 450 ASSERT_WDEV_LOCK(wdev); 451 452 if (!rdev->ops->deauth) 453 return; 454 455 if (!wdev->connected) 456 return; 457 458 memcpy(bssid, wdev->u.client.connected_addr, ETH_ALEN); 459 cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0, 460 WLAN_REASON_DEAUTH_LEAVING, false); 461 } 462 463 struct cfg80211_mgmt_registration { 464 struct list_head list; 465 struct wireless_dev *wdev; 466 467 u32 nlportid; 468 469 int match_len; 470 471 __le16 frame_type; 472 473 bool multicast_rx; 474 475 u8 match[]; 476 }; 477 478 static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev) 479 { 480 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 481 struct wireless_dev *tmp; 482 struct cfg80211_mgmt_registration *reg; 483 struct mgmt_frame_regs upd = {}; 484 485 lockdep_assert_held(&rdev->wiphy.mtx); 486 487 spin_lock_bh(&rdev->mgmt_registrations_lock); 488 if (!wdev->mgmt_registrations_need_update) { 489 spin_unlock_bh(&rdev->mgmt_registrations_lock); 490 return; 491 } 492 493 rcu_read_lock(); 494 list_for_each_entry_rcu(tmp, &rdev->wiphy.wdev_list, list) { 495 list_for_each_entry(reg, &tmp->mgmt_registrations, list) { 496 u32 mask = BIT(le16_to_cpu(reg->frame_type) >> 4); 497 u32 mcast_mask = 0; 498 499 if (reg->multicast_rx) 500 mcast_mask = mask; 501 502 upd.global_stypes |= mask; 503 upd.global_mcast_stypes |= mcast_mask; 504 505 if (tmp == wdev) { 506 upd.interface_stypes |= mask; 507 upd.interface_mcast_stypes |= mcast_mask; 508 } 509 } 510 } 511 rcu_read_unlock(); 512 513 wdev->mgmt_registrations_need_update = 0; 514 spin_unlock_bh(&rdev->mgmt_registrations_lock); 515 516 rdev_update_mgmt_frame_registrations(rdev, wdev, &upd); 517 } 518 519 void cfg80211_mgmt_registrations_update_wk(struct work_struct *wk) 520 { 521 struct cfg80211_registered_device *rdev; 522 struct wireless_dev *wdev; 523 524 rdev = container_of(wk, struct cfg80211_registered_device, 525 mgmt_registrations_update_wk); 526 527 wiphy_lock(&rdev->wiphy); 528 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) 529 cfg80211_mgmt_registrations_update(wdev); 530 wiphy_unlock(&rdev->wiphy); 531 } 532 533 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid, 534 u16 frame_type, const u8 *match_data, 535 int match_len, bool multicast_rx, 536 struct netlink_ext_ack *extack) 537 { 538 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 539 struct cfg80211_mgmt_registration *reg, *nreg; 540 int err = 0; 541 u16 mgmt_type; 542 bool update_multicast = false; 543 544 if (!wdev->wiphy->mgmt_stypes) 545 return -EOPNOTSUPP; 546 547 if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT) { 548 NL_SET_ERR_MSG(extack, "frame type not management"); 549 return -EINVAL; 550 } 551 552 if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) { 553 NL_SET_ERR_MSG(extack, "Invalid frame type"); 554 return -EINVAL; 555 } 556 557 mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4; 558 if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type))) { 559 NL_SET_ERR_MSG(extack, 560 "Registration to specific type not supported"); 561 return -EINVAL; 562 } 563 564 /* 565 * To support Pre Association Security Negotiation (PASN), registration 566 * for authentication frames should be supported. However, as some 567 * versions of the user space daemons wrongly register to all types of 568 * authentication frames (which might result in unexpected behavior) 569 * allow such registration if the request is for a specific 570 * authentication algorithm number. 571 */ 572 if (wdev->iftype == NL80211_IFTYPE_STATION && 573 (frame_type & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_AUTH && 574 !(match_data && match_len >= 2)) { 575 NL_SET_ERR_MSG(extack, 576 "Authentication algorithm number required"); 577 return -EINVAL; 578 } 579 580 nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL); 581 if (!nreg) 582 return -ENOMEM; 583 584 spin_lock_bh(&rdev->mgmt_registrations_lock); 585 586 list_for_each_entry(reg, &wdev->mgmt_registrations, list) { 587 int mlen = min(match_len, reg->match_len); 588 589 if (frame_type != le16_to_cpu(reg->frame_type)) 590 continue; 591 592 if (memcmp(reg->match, match_data, mlen) == 0) { 593 if (reg->multicast_rx != multicast_rx) { 594 update_multicast = true; 595 reg->multicast_rx = multicast_rx; 596 break; 597 } 598 NL_SET_ERR_MSG(extack, "Match already configured"); 599 err = -EALREADY; 600 break; 601 } 602 } 603 604 if (err) 605 goto out; 606 607 if (update_multicast) { 608 kfree(nreg); 609 } else { 610 memcpy(nreg->match, match_data, match_len); 611 nreg->match_len = match_len; 612 nreg->nlportid = snd_portid; 613 nreg->frame_type = cpu_to_le16(frame_type); 614 nreg->wdev = wdev; 615 nreg->multicast_rx = multicast_rx; 616 list_add(&nreg->list, &wdev->mgmt_registrations); 617 } 618 wdev->mgmt_registrations_need_update = 1; 619 spin_unlock_bh(&rdev->mgmt_registrations_lock); 620 621 cfg80211_mgmt_registrations_update(wdev); 622 623 return 0; 624 625 out: 626 kfree(nreg); 627 spin_unlock_bh(&rdev->mgmt_registrations_lock); 628 629 return err; 630 } 631 632 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid) 633 { 634 struct wiphy *wiphy = wdev->wiphy; 635 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 636 struct cfg80211_mgmt_registration *reg, *tmp; 637 638 spin_lock_bh(&rdev->mgmt_registrations_lock); 639 640 list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) { 641 if (reg->nlportid != nlportid) 642 continue; 643 644 list_del(®->list); 645 kfree(reg); 646 647 wdev->mgmt_registrations_need_update = 1; 648 schedule_work(&rdev->mgmt_registrations_update_wk); 649 } 650 651 spin_unlock_bh(&rdev->mgmt_registrations_lock); 652 653 if (nlportid && rdev->crit_proto_nlportid == nlportid) { 654 rdev->crit_proto_nlportid = 0; 655 rdev_crit_proto_stop(rdev, wdev); 656 } 657 658 if (nlportid == wdev->ap_unexpected_nlportid) 659 wdev->ap_unexpected_nlportid = 0; 660 } 661 662 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev) 663 { 664 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 665 struct cfg80211_mgmt_registration *reg, *tmp; 666 667 spin_lock_bh(&rdev->mgmt_registrations_lock); 668 list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) { 669 list_del(®->list); 670 kfree(reg); 671 } 672 wdev->mgmt_registrations_need_update = 1; 673 spin_unlock_bh(&rdev->mgmt_registrations_lock); 674 675 cfg80211_mgmt_registrations_update(wdev); 676 } 677 678 static bool cfg80211_allowed_address(struct wireless_dev *wdev, const u8 *addr) 679 { 680 int i; 681 682 for_each_valid_link(wdev, i) { 683 if (ether_addr_equal(addr, wdev->links[i].addr)) 684 return true; 685 } 686 687 return ether_addr_equal(addr, wdev_address(wdev)); 688 } 689 690 static bool cfg80211_allowed_random_address(struct wireless_dev *wdev, 691 const struct ieee80211_mgmt *mgmt) 692 { 693 if (ieee80211_is_auth(mgmt->frame_control) || 694 ieee80211_is_deauth(mgmt->frame_control)) { 695 /* Allow random TA to be used with authentication and 696 * deauthentication frames if the driver has indicated support. 697 */ 698 if (wiphy_ext_feature_isset( 699 wdev->wiphy, 700 NL80211_EXT_FEATURE_AUTH_AND_DEAUTH_RANDOM_TA)) 701 return true; 702 } else if (ieee80211_is_action(mgmt->frame_control) && 703 mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) { 704 /* Allow random TA to be used with Public Action frames if the 705 * driver has indicated support. 706 */ 707 if (!wdev->connected && 708 wiphy_ext_feature_isset( 709 wdev->wiphy, 710 NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA)) 711 return true; 712 713 if (wdev->connected && 714 wiphy_ext_feature_isset( 715 wdev->wiphy, 716 NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED)) 717 return true; 718 } 719 720 return false; 721 } 722 723 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev, 724 struct wireless_dev *wdev, 725 struct cfg80211_mgmt_tx_params *params, u64 *cookie) 726 { 727 const struct ieee80211_mgmt *mgmt; 728 u16 stype; 729 730 if (!wdev->wiphy->mgmt_stypes) 731 return -EOPNOTSUPP; 732 733 if (!rdev->ops->mgmt_tx) 734 return -EOPNOTSUPP; 735 736 if (params->len < 24 + 1) 737 return -EINVAL; 738 739 mgmt = (const struct ieee80211_mgmt *)params->buf; 740 741 if (!ieee80211_is_mgmt(mgmt->frame_control)) 742 return -EINVAL; 743 744 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 745 if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4))) 746 return -EINVAL; 747 748 if (ieee80211_is_action(mgmt->frame_control) && 749 mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) { 750 int err = 0; 751 752 wdev_lock(wdev); 753 754 switch (wdev->iftype) { 755 case NL80211_IFTYPE_ADHOC: 756 /* 757 * check for IBSS DA must be done by driver as 758 * cfg80211 doesn't track the stations 759 */ 760 if (!wdev->u.ibss.current_bss || 761 !ether_addr_equal(wdev->u.ibss.current_bss->pub.bssid, 762 mgmt->bssid)) { 763 err = -ENOTCONN; 764 break; 765 } 766 break; 767 case NL80211_IFTYPE_STATION: 768 case NL80211_IFTYPE_P2P_CLIENT: 769 if (!wdev->connected) { 770 err = -ENOTCONN; 771 break; 772 } 773 774 /* FIXME: MLD may address this differently */ 775 776 if (!ether_addr_equal(wdev->u.client.connected_addr, 777 mgmt->bssid)) { 778 err = -ENOTCONN; 779 break; 780 } 781 782 /* for station, check that DA is the AP */ 783 if (!ether_addr_equal(wdev->u.client.connected_addr, 784 mgmt->da)) { 785 err = -ENOTCONN; 786 break; 787 } 788 break; 789 case NL80211_IFTYPE_AP: 790 case NL80211_IFTYPE_P2P_GO: 791 case NL80211_IFTYPE_AP_VLAN: 792 if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)) && 793 (params->link_id < 0 || 794 !ether_addr_equal(mgmt->bssid, 795 wdev->links[params->link_id].addr))) 796 err = -EINVAL; 797 break; 798 case NL80211_IFTYPE_MESH_POINT: 799 if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) { 800 err = -EINVAL; 801 break; 802 } 803 /* 804 * check for mesh DA must be done by driver as 805 * cfg80211 doesn't track the stations 806 */ 807 break; 808 case NL80211_IFTYPE_P2P_DEVICE: 809 /* 810 * fall through, P2P device only supports 811 * public action frames 812 */ 813 case NL80211_IFTYPE_NAN: 814 default: 815 err = -EOPNOTSUPP; 816 break; 817 } 818 wdev_unlock(wdev); 819 820 if (err) 821 return err; 822 } 823 824 if (!cfg80211_allowed_address(wdev, mgmt->sa) && 825 !cfg80211_allowed_random_address(wdev, mgmt)) 826 return -EINVAL; 827 828 /* Transmit the management frame as requested by user space */ 829 return rdev_mgmt_tx(rdev, wdev, params, cookie); 830 } 831 832 bool cfg80211_rx_mgmt_ext(struct wireless_dev *wdev, 833 struct cfg80211_rx_info *info) 834 { 835 struct wiphy *wiphy = wdev->wiphy; 836 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 837 struct cfg80211_mgmt_registration *reg; 838 const struct ieee80211_txrx_stypes *stypes = 839 &wiphy->mgmt_stypes[wdev->iftype]; 840 struct ieee80211_mgmt *mgmt = (void *)info->buf; 841 const u8 *data; 842 int data_len; 843 bool result = false; 844 __le16 ftype = mgmt->frame_control & 845 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE); 846 u16 stype; 847 848 trace_cfg80211_rx_mgmt(wdev, info); 849 stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4; 850 851 if (!(stypes->rx & BIT(stype))) { 852 trace_cfg80211_return_bool(false); 853 return false; 854 } 855 856 data = info->buf + ieee80211_hdrlen(mgmt->frame_control); 857 data_len = info->len - ieee80211_hdrlen(mgmt->frame_control); 858 859 spin_lock_bh(&rdev->mgmt_registrations_lock); 860 861 list_for_each_entry(reg, &wdev->mgmt_registrations, list) { 862 if (reg->frame_type != ftype) 863 continue; 864 865 if (reg->match_len > data_len) 866 continue; 867 868 if (memcmp(reg->match, data, reg->match_len)) 869 continue; 870 871 /* found match! */ 872 873 /* Indicate the received Action frame to user space */ 874 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid, info, 875 GFP_ATOMIC)) 876 continue; 877 878 result = true; 879 break; 880 } 881 882 spin_unlock_bh(&rdev->mgmt_registrations_lock); 883 884 trace_cfg80211_return_bool(result); 885 return result; 886 } 887 EXPORT_SYMBOL(cfg80211_rx_mgmt_ext); 888 889 void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev) 890 { 891 cancel_delayed_work(&rdev->dfs_update_channels_wk); 892 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0); 893 } 894 895 void cfg80211_dfs_channels_update_work(struct work_struct *work) 896 { 897 struct delayed_work *delayed_work = to_delayed_work(work); 898 struct cfg80211_registered_device *rdev; 899 struct cfg80211_chan_def chandef; 900 struct ieee80211_supported_band *sband; 901 struct ieee80211_channel *c; 902 struct wiphy *wiphy; 903 bool check_again = false; 904 unsigned long timeout, next_time = 0; 905 unsigned long time_dfs_update; 906 enum nl80211_radar_event radar_event; 907 int bandid, i; 908 909 rdev = container_of(delayed_work, struct cfg80211_registered_device, 910 dfs_update_channels_wk); 911 wiphy = &rdev->wiphy; 912 913 rtnl_lock(); 914 for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) { 915 sband = wiphy->bands[bandid]; 916 if (!sband) 917 continue; 918 919 for (i = 0; i < sband->n_channels; i++) { 920 c = &sband->channels[i]; 921 922 if (!(c->flags & IEEE80211_CHAN_RADAR)) 923 continue; 924 925 if (c->dfs_state != NL80211_DFS_UNAVAILABLE && 926 c->dfs_state != NL80211_DFS_AVAILABLE) 927 continue; 928 929 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) { 930 time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS; 931 radar_event = NL80211_RADAR_NOP_FINISHED; 932 } else { 933 if (regulatory_pre_cac_allowed(wiphy) || 934 cfg80211_any_wiphy_oper_chan(wiphy, c)) 935 continue; 936 937 time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS; 938 radar_event = NL80211_RADAR_PRE_CAC_EXPIRED; 939 } 940 941 timeout = c->dfs_state_entered + 942 msecs_to_jiffies(time_dfs_update); 943 944 if (time_after_eq(jiffies, timeout)) { 945 c->dfs_state = NL80211_DFS_USABLE; 946 c->dfs_state_entered = jiffies; 947 948 cfg80211_chandef_create(&chandef, c, 949 NL80211_CHAN_NO_HT); 950 951 nl80211_radar_notify(rdev, &chandef, 952 radar_event, NULL, 953 GFP_ATOMIC); 954 955 regulatory_propagate_dfs_state(wiphy, &chandef, 956 c->dfs_state, 957 radar_event); 958 continue; 959 } 960 961 if (!check_again) 962 next_time = timeout - jiffies; 963 else 964 next_time = min(next_time, timeout - jiffies); 965 check_again = true; 966 } 967 } 968 rtnl_unlock(); 969 970 /* reschedule if there are other channels waiting to be cleared again */ 971 if (check_again) 972 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 973 next_time); 974 } 975 976 977 void __cfg80211_radar_event(struct wiphy *wiphy, 978 struct cfg80211_chan_def *chandef, 979 bool offchan, gfp_t gfp) 980 { 981 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 982 983 trace_cfg80211_radar_event(wiphy, chandef, offchan); 984 985 /* only set the chandef supplied channel to unavailable, in 986 * case the radar is detected on only one of multiple channels 987 * spanned by the chandef. 988 */ 989 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE); 990 991 if (offchan) 992 queue_work(cfg80211_wq, &rdev->background_cac_abort_wk); 993 994 cfg80211_sched_dfs_chan_update(rdev); 995 996 nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp); 997 998 memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def)); 999 queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk); 1000 } 1001 EXPORT_SYMBOL(__cfg80211_radar_event); 1002 1003 void cfg80211_cac_event(struct net_device *netdev, 1004 const struct cfg80211_chan_def *chandef, 1005 enum nl80211_radar_event event, gfp_t gfp) 1006 { 1007 struct wireless_dev *wdev = netdev->ieee80211_ptr; 1008 struct wiphy *wiphy = wdev->wiphy; 1009 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1010 unsigned long timeout; 1011 1012 /* not yet supported */ 1013 if (wdev->valid_links) 1014 return; 1015 1016 trace_cfg80211_cac_event(netdev, event); 1017 1018 if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED)) 1019 return; 1020 1021 switch (event) { 1022 case NL80211_RADAR_CAC_FINISHED: 1023 timeout = wdev->cac_start_time + 1024 msecs_to_jiffies(wdev->cac_time_ms); 1025 WARN_ON(!time_after_eq(jiffies, timeout)); 1026 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE); 1027 memcpy(&rdev->cac_done_chandef, chandef, 1028 sizeof(struct cfg80211_chan_def)); 1029 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk); 1030 cfg80211_sched_dfs_chan_update(rdev); 1031 fallthrough; 1032 case NL80211_RADAR_CAC_ABORTED: 1033 wdev->cac_started = false; 1034 break; 1035 case NL80211_RADAR_CAC_STARTED: 1036 wdev->cac_started = true; 1037 break; 1038 default: 1039 WARN_ON(1); 1040 return; 1041 } 1042 1043 nl80211_radar_notify(rdev, chandef, event, netdev, gfp); 1044 } 1045 EXPORT_SYMBOL(cfg80211_cac_event); 1046 1047 static void 1048 __cfg80211_background_cac_event(struct cfg80211_registered_device *rdev, 1049 struct wireless_dev *wdev, 1050 const struct cfg80211_chan_def *chandef, 1051 enum nl80211_radar_event event) 1052 { 1053 struct wiphy *wiphy = &rdev->wiphy; 1054 struct net_device *netdev; 1055 1056 lockdep_assert_wiphy(&rdev->wiphy); 1057 1058 if (!cfg80211_chandef_valid(chandef)) 1059 return; 1060 1061 if (!rdev->background_radar_wdev) 1062 return; 1063 1064 switch (event) { 1065 case NL80211_RADAR_CAC_FINISHED: 1066 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE); 1067 memcpy(&rdev->cac_done_chandef, chandef, sizeof(*chandef)); 1068 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk); 1069 cfg80211_sched_dfs_chan_update(rdev); 1070 wdev = rdev->background_radar_wdev; 1071 break; 1072 case NL80211_RADAR_CAC_ABORTED: 1073 if (!cancel_delayed_work(&rdev->background_cac_done_wk)) 1074 return; 1075 wdev = rdev->background_radar_wdev; 1076 break; 1077 case NL80211_RADAR_CAC_STARTED: 1078 break; 1079 default: 1080 return; 1081 } 1082 1083 netdev = wdev ? wdev->netdev : NULL; 1084 nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL); 1085 } 1086 1087 static void 1088 cfg80211_background_cac_event(struct cfg80211_registered_device *rdev, 1089 const struct cfg80211_chan_def *chandef, 1090 enum nl80211_radar_event event) 1091 { 1092 wiphy_lock(&rdev->wiphy); 1093 __cfg80211_background_cac_event(rdev, rdev->background_radar_wdev, 1094 chandef, event); 1095 wiphy_unlock(&rdev->wiphy); 1096 } 1097 1098 void cfg80211_background_cac_done_wk(struct work_struct *work) 1099 { 1100 struct delayed_work *delayed_work = to_delayed_work(work); 1101 struct cfg80211_registered_device *rdev; 1102 1103 rdev = container_of(delayed_work, struct cfg80211_registered_device, 1104 background_cac_done_wk); 1105 cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef, 1106 NL80211_RADAR_CAC_FINISHED); 1107 } 1108 1109 void cfg80211_background_cac_abort_wk(struct work_struct *work) 1110 { 1111 struct cfg80211_registered_device *rdev; 1112 1113 rdev = container_of(work, struct cfg80211_registered_device, 1114 background_cac_abort_wk); 1115 cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef, 1116 NL80211_RADAR_CAC_ABORTED); 1117 } 1118 1119 void cfg80211_background_cac_abort(struct wiphy *wiphy) 1120 { 1121 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1122 1123 queue_work(cfg80211_wq, &rdev->background_cac_abort_wk); 1124 } 1125 EXPORT_SYMBOL(cfg80211_background_cac_abort); 1126 1127 int 1128 cfg80211_start_background_radar_detection(struct cfg80211_registered_device *rdev, 1129 struct wireless_dev *wdev, 1130 struct cfg80211_chan_def *chandef) 1131 { 1132 unsigned int cac_time_ms; 1133 int err; 1134 1135 lockdep_assert_wiphy(&rdev->wiphy); 1136 1137 if (!wiphy_ext_feature_isset(&rdev->wiphy, 1138 NL80211_EXT_FEATURE_RADAR_BACKGROUND)) 1139 return -EOPNOTSUPP; 1140 1141 /* Offchannel chain already locked by another wdev */ 1142 if (rdev->background_radar_wdev && rdev->background_radar_wdev != wdev) 1143 return -EBUSY; 1144 1145 /* CAC already in progress on the offchannel chain */ 1146 if (rdev->background_radar_wdev == wdev && 1147 delayed_work_pending(&rdev->background_cac_done_wk)) 1148 return -EBUSY; 1149 1150 err = rdev_set_radar_background(rdev, chandef); 1151 if (err) 1152 return err; 1153 1154 cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, chandef); 1155 if (!cac_time_ms) 1156 cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS; 1157 1158 rdev->background_radar_chandef = *chandef; 1159 rdev->background_radar_wdev = wdev; /* Get offchain ownership */ 1160 1161 __cfg80211_background_cac_event(rdev, wdev, chandef, 1162 NL80211_RADAR_CAC_STARTED); 1163 queue_delayed_work(cfg80211_wq, &rdev->background_cac_done_wk, 1164 msecs_to_jiffies(cac_time_ms)); 1165 1166 return 0; 1167 } 1168 1169 void cfg80211_stop_background_radar_detection(struct wireless_dev *wdev) 1170 { 1171 struct wiphy *wiphy = wdev->wiphy; 1172 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1173 1174 lockdep_assert_wiphy(wiphy); 1175 1176 if (wdev != rdev->background_radar_wdev) 1177 return; 1178 1179 rdev_set_radar_background(rdev, NULL); 1180 rdev->background_radar_wdev = NULL; /* Release offchain ownership */ 1181 1182 __cfg80211_background_cac_event(rdev, wdev, 1183 &rdev->background_radar_chandef, 1184 NL80211_RADAR_CAC_ABORTED); 1185 } 1186