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, 2022-2023 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 lockdep_assert_wiphy(wdev->wiphy); 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 lockdep_assert_wiphy(wdev->wiphy); 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 lockdep_assert_wiphy(wdev->wiphy); 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 lockdep_assert_wiphy(wdev->wiphy); 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 lockdep_assert_wiphy(wdev->wiphy); 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 lockdep_assert_wiphy(wdev->wiphy); 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 lockdep_assert_wiphy(wdev->wiphy); 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 lockdep_assert_wiphy(&rdev->wiphy); 731 732 if (!wdev->wiphy->mgmt_stypes) 733 return -EOPNOTSUPP; 734 735 if (!rdev->ops->mgmt_tx) 736 return -EOPNOTSUPP; 737 738 if (params->len < 24 + 1) 739 return -EINVAL; 740 741 mgmt = (const struct ieee80211_mgmt *)params->buf; 742 743 if (!ieee80211_is_mgmt(mgmt->frame_control)) 744 return -EINVAL; 745 746 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 747 if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4))) 748 return -EINVAL; 749 750 if (ieee80211_is_action(mgmt->frame_control) && 751 mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) { 752 int err = 0; 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 } 818 819 if (err) 820 return err; 821 } 822 823 if (!cfg80211_allowed_address(wdev, mgmt->sa) && 824 !cfg80211_allowed_random_address(wdev, mgmt)) 825 return -EINVAL; 826 827 /* Transmit the management frame as requested by user space */ 828 return rdev_mgmt_tx(rdev, wdev, params, cookie); 829 } 830 831 bool cfg80211_rx_mgmt_ext(struct wireless_dev *wdev, 832 struct cfg80211_rx_info *info) 833 { 834 struct wiphy *wiphy = wdev->wiphy; 835 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 836 struct cfg80211_mgmt_registration *reg; 837 const struct ieee80211_txrx_stypes *stypes = 838 &wiphy->mgmt_stypes[wdev->iftype]; 839 struct ieee80211_mgmt *mgmt = (void *)info->buf; 840 const u8 *data; 841 int data_len; 842 bool result = false; 843 __le16 ftype = mgmt->frame_control & 844 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE); 845 u16 stype; 846 847 trace_cfg80211_rx_mgmt(wdev, info); 848 stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4; 849 850 if (!(stypes->rx & BIT(stype))) { 851 trace_cfg80211_return_bool(false); 852 return false; 853 } 854 855 data = info->buf + ieee80211_hdrlen(mgmt->frame_control); 856 data_len = info->len - ieee80211_hdrlen(mgmt->frame_control); 857 858 spin_lock_bh(&rdev->mgmt_registrations_lock); 859 860 list_for_each_entry(reg, &wdev->mgmt_registrations, list) { 861 if (reg->frame_type != ftype) 862 continue; 863 864 if (reg->match_len > data_len) 865 continue; 866 867 if (memcmp(reg->match, data, reg->match_len)) 868 continue; 869 870 /* found match! */ 871 872 /* Indicate the received Action frame to user space */ 873 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid, info, 874 GFP_ATOMIC)) 875 continue; 876 877 result = true; 878 break; 879 } 880 881 spin_unlock_bh(&rdev->mgmt_registrations_lock); 882 883 trace_cfg80211_return_bool(result); 884 return result; 885 } 886 EXPORT_SYMBOL(cfg80211_rx_mgmt_ext); 887 888 void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev) 889 { 890 cancel_delayed_work(&rdev->dfs_update_channels_wk); 891 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0); 892 } 893 894 void cfg80211_dfs_channels_update_work(struct work_struct *work) 895 { 896 struct delayed_work *delayed_work = to_delayed_work(work); 897 struct cfg80211_registered_device *rdev; 898 struct cfg80211_chan_def chandef; 899 struct ieee80211_supported_band *sband; 900 struct ieee80211_channel *c; 901 struct wiphy *wiphy; 902 bool check_again = false; 903 unsigned long timeout, next_time = 0; 904 unsigned long time_dfs_update; 905 enum nl80211_radar_event radar_event; 906 int bandid, i; 907 908 rdev = container_of(delayed_work, struct cfg80211_registered_device, 909 dfs_update_channels_wk); 910 wiphy = &rdev->wiphy; 911 912 rtnl_lock(); 913 for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) { 914 sband = wiphy->bands[bandid]; 915 if (!sband) 916 continue; 917 918 for (i = 0; i < sband->n_channels; i++) { 919 c = &sband->channels[i]; 920 921 if (!(c->flags & IEEE80211_CHAN_RADAR)) 922 continue; 923 924 if (c->dfs_state != NL80211_DFS_UNAVAILABLE && 925 c->dfs_state != NL80211_DFS_AVAILABLE) 926 continue; 927 928 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) { 929 time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS; 930 radar_event = NL80211_RADAR_NOP_FINISHED; 931 } else { 932 if (regulatory_pre_cac_allowed(wiphy) || 933 cfg80211_any_wiphy_oper_chan(wiphy, c)) 934 continue; 935 936 time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS; 937 radar_event = NL80211_RADAR_PRE_CAC_EXPIRED; 938 } 939 940 timeout = c->dfs_state_entered + 941 msecs_to_jiffies(time_dfs_update); 942 943 if (time_after_eq(jiffies, timeout)) { 944 c->dfs_state = NL80211_DFS_USABLE; 945 c->dfs_state_entered = jiffies; 946 947 cfg80211_chandef_create(&chandef, c, 948 NL80211_CHAN_NO_HT); 949 950 nl80211_radar_notify(rdev, &chandef, 951 radar_event, NULL, 952 GFP_ATOMIC); 953 954 regulatory_propagate_dfs_state(wiphy, &chandef, 955 c->dfs_state, 956 radar_event); 957 continue; 958 } 959 960 if (!check_again) 961 next_time = timeout - jiffies; 962 else 963 next_time = min(next_time, timeout - jiffies); 964 check_again = true; 965 } 966 } 967 rtnl_unlock(); 968 969 /* reschedule if there are other channels waiting to be cleared again */ 970 if (check_again) 971 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 972 next_time); 973 } 974 975 976 void __cfg80211_radar_event(struct wiphy *wiphy, 977 struct cfg80211_chan_def *chandef, 978 bool offchan, gfp_t gfp) 979 { 980 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 981 982 trace_cfg80211_radar_event(wiphy, chandef, offchan); 983 984 /* only set the chandef supplied channel to unavailable, in 985 * case the radar is detected on only one of multiple channels 986 * spanned by the chandef. 987 */ 988 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE); 989 990 if (offchan) 991 queue_work(cfg80211_wq, &rdev->background_cac_abort_wk); 992 993 cfg80211_sched_dfs_chan_update(rdev); 994 995 nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp); 996 997 memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def)); 998 queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk); 999 } 1000 EXPORT_SYMBOL(__cfg80211_radar_event); 1001 1002 void cfg80211_cac_event(struct net_device *netdev, 1003 const struct cfg80211_chan_def *chandef, 1004 enum nl80211_radar_event event, gfp_t gfp) 1005 { 1006 struct wireless_dev *wdev = netdev->ieee80211_ptr; 1007 struct wiphy *wiphy = wdev->wiphy; 1008 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1009 unsigned long timeout; 1010 1011 /* not yet supported */ 1012 if (wdev->valid_links) 1013 return; 1014 1015 trace_cfg80211_cac_event(netdev, event); 1016 1017 if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED)) 1018 return; 1019 1020 switch (event) { 1021 case NL80211_RADAR_CAC_FINISHED: 1022 timeout = wdev->cac_start_time + 1023 msecs_to_jiffies(wdev->cac_time_ms); 1024 WARN_ON(!time_after_eq(jiffies, timeout)); 1025 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE); 1026 memcpy(&rdev->cac_done_chandef, chandef, 1027 sizeof(struct cfg80211_chan_def)); 1028 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk); 1029 cfg80211_sched_dfs_chan_update(rdev); 1030 fallthrough; 1031 case NL80211_RADAR_CAC_ABORTED: 1032 wdev->cac_started = false; 1033 break; 1034 case NL80211_RADAR_CAC_STARTED: 1035 wdev->cac_started = true; 1036 break; 1037 default: 1038 WARN_ON(1); 1039 return; 1040 } 1041 1042 nl80211_radar_notify(rdev, chandef, event, netdev, gfp); 1043 } 1044 EXPORT_SYMBOL(cfg80211_cac_event); 1045 1046 static void 1047 __cfg80211_background_cac_event(struct cfg80211_registered_device *rdev, 1048 struct wireless_dev *wdev, 1049 const struct cfg80211_chan_def *chandef, 1050 enum nl80211_radar_event event) 1051 { 1052 struct wiphy *wiphy = &rdev->wiphy; 1053 struct net_device *netdev; 1054 1055 lockdep_assert_wiphy(&rdev->wiphy); 1056 1057 if (!cfg80211_chandef_valid(chandef)) 1058 return; 1059 1060 if (!rdev->background_radar_wdev) 1061 return; 1062 1063 switch (event) { 1064 case NL80211_RADAR_CAC_FINISHED: 1065 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE); 1066 memcpy(&rdev->cac_done_chandef, chandef, sizeof(*chandef)); 1067 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk); 1068 cfg80211_sched_dfs_chan_update(rdev); 1069 wdev = rdev->background_radar_wdev; 1070 break; 1071 case NL80211_RADAR_CAC_ABORTED: 1072 if (!cancel_delayed_work(&rdev->background_cac_done_wk)) 1073 return; 1074 wdev = rdev->background_radar_wdev; 1075 break; 1076 case NL80211_RADAR_CAC_STARTED: 1077 break; 1078 default: 1079 return; 1080 } 1081 1082 netdev = wdev ? wdev->netdev : NULL; 1083 nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL); 1084 } 1085 1086 static void 1087 cfg80211_background_cac_event(struct cfg80211_registered_device *rdev, 1088 const struct cfg80211_chan_def *chandef, 1089 enum nl80211_radar_event event) 1090 { 1091 wiphy_lock(&rdev->wiphy); 1092 __cfg80211_background_cac_event(rdev, rdev->background_radar_wdev, 1093 chandef, event); 1094 wiphy_unlock(&rdev->wiphy); 1095 } 1096 1097 void cfg80211_background_cac_done_wk(struct work_struct *work) 1098 { 1099 struct delayed_work *delayed_work = to_delayed_work(work); 1100 struct cfg80211_registered_device *rdev; 1101 1102 rdev = container_of(delayed_work, struct cfg80211_registered_device, 1103 background_cac_done_wk); 1104 cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef, 1105 NL80211_RADAR_CAC_FINISHED); 1106 } 1107 1108 void cfg80211_background_cac_abort_wk(struct work_struct *work) 1109 { 1110 struct cfg80211_registered_device *rdev; 1111 1112 rdev = container_of(work, struct cfg80211_registered_device, 1113 background_cac_abort_wk); 1114 cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef, 1115 NL80211_RADAR_CAC_ABORTED); 1116 } 1117 1118 void cfg80211_background_cac_abort(struct wiphy *wiphy) 1119 { 1120 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1121 1122 queue_work(cfg80211_wq, &rdev->background_cac_abort_wk); 1123 } 1124 EXPORT_SYMBOL(cfg80211_background_cac_abort); 1125 1126 int 1127 cfg80211_start_background_radar_detection(struct cfg80211_registered_device *rdev, 1128 struct wireless_dev *wdev, 1129 struct cfg80211_chan_def *chandef) 1130 { 1131 unsigned int cac_time_ms; 1132 int err; 1133 1134 lockdep_assert_wiphy(&rdev->wiphy); 1135 1136 if (!wiphy_ext_feature_isset(&rdev->wiphy, 1137 NL80211_EXT_FEATURE_RADAR_BACKGROUND)) 1138 return -EOPNOTSUPP; 1139 1140 /* Offchannel chain already locked by another wdev */ 1141 if (rdev->background_radar_wdev && rdev->background_radar_wdev != wdev) 1142 return -EBUSY; 1143 1144 /* CAC already in progress on the offchannel chain */ 1145 if (rdev->background_radar_wdev == wdev && 1146 delayed_work_pending(&rdev->background_cac_done_wk)) 1147 return -EBUSY; 1148 1149 err = rdev_set_radar_background(rdev, chandef); 1150 if (err) 1151 return err; 1152 1153 cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, chandef); 1154 if (!cac_time_ms) 1155 cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS; 1156 1157 rdev->background_radar_chandef = *chandef; 1158 rdev->background_radar_wdev = wdev; /* Get offchain ownership */ 1159 1160 __cfg80211_background_cac_event(rdev, wdev, chandef, 1161 NL80211_RADAR_CAC_STARTED); 1162 queue_delayed_work(cfg80211_wq, &rdev->background_cac_done_wk, 1163 msecs_to_jiffies(cac_time_ms)); 1164 1165 return 0; 1166 } 1167 1168 void cfg80211_stop_background_radar_detection(struct wireless_dev *wdev) 1169 { 1170 struct wiphy *wiphy = wdev->wiphy; 1171 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1172 1173 lockdep_assert_wiphy(wiphy); 1174 1175 if (wdev != rdev->background_radar_wdev) 1176 return; 1177 1178 rdev_set_radar_background(rdev, NULL); 1179 rdev->background_radar_wdev = NULL; /* Release offchain ownership */ 1180 1181 __cfg80211_background_cac_event(rdev, wdev, 1182 &rdev->background_radar_chandef, 1183 NL80211_RADAR_CAC_ABORTED); 1184 } 1185