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 cr.links[link_id].bss = data->links[link_id].bss; 47 48 WARN_ON_ONCE(cr.links[link_id].status != WLAN_STATUS_SUCCESS && 49 (!cr.ap_mld_addr || !cr.links[link_id].bss)); 50 51 if (!cr.links[link_id].bss) 52 continue; 53 cr.links[link_id].bssid = data->links[link_id].bss->bssid; 54 cr.links[link_id].addr = data->links[link_id].addr; 55 /* need to have local link addresses for MLO connections */ 56 WARN_ON(cr.ap_mld_addr && 57 !is_valid_ether_addr(cr.links[link_id].addr)); 58 59 BUG_ON(!cr.links[link_id].bss->channel); 60 61 if (cr.links[link_id].bss->channel->band == NL80211_BAND_S1GHZ) { 62 WARN_ON(link_id); 63 cr.resp_ie = (u8 *)&mgmt->u.s1g_assoc_resp.variable; 64 cr.resp_ie_len = data->len - 65 offsetof(struct ieee80211_mgmt, 66 u.s1g_assoc_resp.variable); 67 } 68 69 if (cr.ap_mld_addr) 70 cr.valid_links |= BIT(link_id); 71 } 72 73 trace_cfg80211_send_rx_assoc(dev, data); 74 75 /* 76 * This is a bit of a hack, we don't notify userspace of 77 * a (re-)association reply if we tried to send a reassoc 78 * and got a reject -- we only try again with an assoc 79 * frame instead of reassoc. 80 */ 81 if (cfg80211_sme_rx_assoc_resp(wdev, cr.status)) { 82 for (link_id = 0; link_id < ARRAY_SIZE(data->links); link_id++) { 83 struct cfg80211_bss *bss = data->links[link_id].bss; 84 85 if (!bss) 86 continue; 87 88 cfg80211_unhold_bss(bss_from_pub(bss)); 89 cfg80211_put_bss(wiphy, bss); 90 } 91 return; 92 } 93 94 nl80211_send_rx_assoc(rdev, dev, data); 95 /* update current_bss etc., consumes the bss reference */ 96 __cfg80211_connect_result(dev, &cr, cr.status == WLAN_STATUS_SUCCESS); 97 } 98 EXPORT_SYMBOL(cfg80211_rx_assoc_resp); 99 100 static void cfg80211_process_auth(struct wireless_dev *wdev, 101 const u8 *buf, size_t len) 102 { 103 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 104 105 nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL); 106 cfg80211_sme_rx_auth(wdev, buf, len); 107 } 108 109 static void cfg80211_process_deauth(struct wireless_dev *wdev, 110 const u8 *buf, size_t len, 111 bool reconnect) 112 { 113 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 114 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf; 115 const u8 *bssid = mgmt->bssid; 116 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 117 bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr); 118 119 nl80211_send_deauth(rdev, wdev->netdev, buf, len, reconnect, GFP_KERNEL); 120 121 if (!wdev->connected || !ether_addr_equal(wdev->u.client.connected_addr, bssid)) 122 return; 123 124 __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap); 125 cfg80211_sme_deauth(wdev); 126 } 127 128 static void cfg80211_process_disassoc(struct wireless_dev *wdev, 129 const u8 *buf, size_t len, 130 bool reconnect) 131 { 132 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 133 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf; 134 const u8 *bssid = mgmt->bssid; 135 u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 136 bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr); 137 138 nl80211_send_disassoc(rdev, wdev->netdev, buf, len, reconnect, 139 GFP_KERNEL); 140 141 if (WARN_ON(!wdev->connected || 142 !ether_addr_equal(wdev->u.client.connected_addr, bssid))) 143 return; 144 145 __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap); 146 cfg80211_sme_disassoc(wdev); 147 } 148 149 void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len) 150 { 151 struct wireless_dev *wdev = dev->ieee80211_ptr; 152 struct ieee80211_mgmt *mgmt = (void *)buf; 153 154 ASSERT_WDEV_LOCK(wdev); 155 156 trace_cfg80211_rx_mlme_mgmt(dev, buf, len); 157 158 if (WARN_ON(len < 2)) 159 return; 160 161 if (ieee80211_is_auth(mgmt->frame_control)) 162 cfg80211_process_auth(wdev, buf, len); 163 else if (ieee80211_is_deauth(mgmt->frame_control)) 164 cfg80211_process_deauth(wdev, buf, len, false); 165 else if (ieee80211_is_disassoc(mgmt->frame_control)) 166 cfg80211_process_disassoc(wdev, buf, len, false); 167 } 168 EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt); 169 170 void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr) 171 { 172 struct wireless_dev *wdev = dev->ieee80211_ptr; 173 struct wiphy *wiphy = wdev->wiphy; 174 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 175 176 trace_cfg80211_send_auth_timeout(dev, addr); 177 178 nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL); 179 cfg80211_sme_auth_timeout(wdev); 180 } 181 EXPORT_SYMBOL(cfg80211_auth_timeout); 182 183 void cfg80211_assoc_failure(struct net_device *dev, 184 struct cfg80211_assoc_failure *data) 185 { 186 struct wireless_dev *wdev = dev->ieee80211_ptr; 187 struct wiphy *wiphy = wdev->wiphy; 188 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 189 const u8 *addr = data->ap_mld_addr ?: data->bss[0]->bssid; 190 int i; 191 192 trace_cfg80211_send_assoc_failure(dev, data); 193 194 if (data->timeout) { 195 nl80211_send_assoc_timeout(rdev, dev, addr, GFP_KERNEL); 196 cfg80211_sme_assoc_timeout(wdev); 197 } else { 198 cfg80211_sme_abandon_assoc(wdev); 199 } 200 201 for (i = 0; i < ARRAY_SIZE(data->bss); i++) { 202 struct cfg80211_bss *bss = data->bss[i]; 203 204 if (!bss) 205 continue; 206 207 cfg80211_unhold_bss(bss_from_pub(bss)); 208 cfg80211_put_bss(wiphy, bss); 209 } 210 } 211 EXPORT_SYMBOL(cfg80211_assoc_failure); 212 213 void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len, 214 bool reconnect) 215 { 216 struct wireless_dev *wdev = dev->ieee80211_ptr; 217 struct ieee80211_mgmt *mgmt = (void *)buf; 218 219 ASSERT_WDEV_LOCK(wdev); 220 221 trace_cfg80211_tx_mlme_mgmt(dev, buf, len, reconnect); 222 223 if (WARN_ON(len < 2)) 224 return; 225 226 if (ieee80211_is_deauth(mgmt->frame_control)) 227 cfg80211_process_deauth(wdev, buf, len, reconnect); 228 else 229 cfg80211_process_disassoc(wdev, buf, len, reconnect); 230 } 231 EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt); 232 233 void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr, 234 enum nl80211_key_type key_type, int key_id, 235 const u8 *tsc, gfp_t gfp) 236 { 237 struct wiphy *wiphy = dev->ieee80211_ptr->wiphy; 238 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 239 #ifdef CONFIG_CFG80211_WEXT 240 union iwreq_data wrqu; 241 char *buf = kmalloc(128, gfp); 242 243 if (buf) { 244 sprintf(buf, "MLME-MICHAELMICFAILURE.indication(" 245 "keyid=%d %scast addr=%pM)", key_id, 246 key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni", 247 addr); 248 memset(&wrqu, 0, sizeof(wrqu)); 249 wrqu.data.length = strlen(buf); 250 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf); 251 kfree(buf); 252 } 253 #endif 254 255 trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc); 256 nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp); 257 } 258 EXPORT_SYMBOL(cfg80211_michael_mic_failure); 259 260 /* some MLME handling for userspace SME */ 261 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev, 262 struct net_device *dev, 263 struct cfg80211_auth_request *req) 264 { 265 struct wireless_dev *wdev = dev->ieee80211_ptr; 266 267 ASSERT_WDEV_LOCK(wdev); 268 269 if (!req->bss) 270 return -ENOENT; 271 272 if (req->link_id >= 0 && 273 !(wdev->wiphy->flags & WIPHY_FLAG_SUPPORTS_MLO)) 274 return -EINVAL; 275 276 if (req->auth_type == NL80211_AUTHTYPE_SHARED_KEY) { 277 if (!req->key || !req->key_len || 278 req->key_idx < 0 || req->key_idx > 3) 279 return -EINVAL; 280 } 281 282 if (wdev->connected && 283 ether_addr_equal(req->bss->bssid, wdev->u.client.connected_addr)) 284 return -EALREADY; 285 286 if (ether_addr_equal(req->bss->bssid, dev->dev_addr) || 287 (req->link_id >= 0 && 288 ether_addr_equal(req->ap_mld_addr, dev->dev_addr))) 289 return -EINVAL; 290 291 return rdev_auth(rdev, dev, req); 292 } 293 294 /* Do a logical ht_capa &= ht_capa_mask. */ 295 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa, 296 const struct ieee80211_ht_cap *ht_capa_mask) 297 { 298 int i; 299 u8 *p1, *p2; 300 if (!ht_capa_mask) { 301 memset(ht_capa, 0, sizeof(*ht_capa)); 302 return; 303 } 304 305 p1 = (u8*)(ht_capa); 306 p2 = (u8*)(ht_capa_mask); 307 for (i = 0; i < sizeof(*ht_capa); i++) 308 p1[i] &= p2[i]; 309 } 310 311 /* Do a logical vht_capa &= vht_capa_mask. */ 312 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa, 313 const struct ieee80211_vht_cap *vht_capa_mask) 314 { 315 int i; 316 u8 *p1, *p2; 317 if (!vht_capa_mask) { 318 memset(vht_capa, 0, sizeof(*vht_capa)); 319 return; 320 } 321 322 p1 = (u8*)(vht_capa); 323 p2 = (u8*)(vht_capa_mask); 324 for (i = 0; i < sizeof(*vht_capa); i++) 325 p1[i] &= p2[i]; 326 } 327 328 /* Note: caller must cfg80211_put_bss() regardless of result */ 329 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev, 330 struct net_device *dev, 331 struct cfg80211_assoc_request *req) 332 { 333 struct wireless_dev *wdev = dev->ieee80211_ptr; 334 int err, i, j; 335 336 ASSERT_WDEV_LOCK(wdev); 337 338 for (i = 1; i < ARRAY_SIZE(req->links); i++) { 339 if (!req->links[i].bss) 340 continue; 341 for (j = 0; j < i; j++) { 342 if (req->links[i].bss == req->links[j].bss) 343 return -EINVAL; 344 } 345 346 if (ether_addr_equal(req->links[i].bss->bssid, dev->dev_addr)) 347 return -EINVAL; 348 } 349 350 if (wdev->connected && 351 (!req->prev_bssid || 352 !ether_addr_equal(wdev->u.client.connected_addr, req->prev_bssid))) 353 return -EALREADY; 354 355 if ((req->bss && ether_addr_equal(req->bss->bssid, dev->dev_addr)) || 356 (req->link_id >= 0 && 357 ether_addr_equal(req->ap_mld_addr, dev->dev_addr))) 358 return -EINVAL; 359 360 cfg80211_oper_and_ht_capa(&req->ht_capa_mask, 361 rdev->wiphy.ht_capa_mod_mask); 362 cfg80211_oper_and_vht_capa(&req->vht_capa_mask, 363 rdev->wiphy.vht_capa_mod_mask); 364 365 err = rdev_assoc(rdev, dev, req); 366 if (!err) { 367 int link_id; 368 369 if (req->bss) { 370 cfg80211_ref_bss(&rdev->wiphy, req->bss); 371 cfg80211_hold_bss(bss_from_pub(req->bss)); 372 } 373 374 for (link_id = 0; link_id < ARRAY_SIZE(req->links); link_id++) { 375 if (!req->links[link_id].bss) 376 continue; 377 cfg80211_ref_bss(&rdev->wiphy, req->links[link_id].bss); 378 cfg80211_hold_bss(bss_from_pub(req->links[link_id].bss)); 379 } 380 } 381 return err; 382 } 383 384 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev, 385 struct net_device *dev, const u8 *bssid, 386 const u8 *ie, int ie_len, u16 reason, 387 bool local_state_change) 388 { 389 struct wireless_dev *wdev = dev->ieee80211_ptr; 390 struct cfg80211_deauth_request req = { 391 .bssid = bssid, 392 .reason_code = reason, 393 .ie = ie, 394 .ie_len = ie_len, 395 .local_state_change = local_state_change, 396 }; 397 398 ASSERT_WDEV_LOCK(wdev); 399 400 if (local_state_change && 401 (!wdev->connected || 402 !ether_addr_equal(wdev->u.client.connected_addr, bssid))) 403 return 0; 404 405 if (ether_addr_equal(wdev->disconnect_bssid, bssid) || 406 (wdev->connected && 407 ether_addr_equal(wdev->u.client.connected_addr, bssid))) 408 wdev->conn_owner_nlportid = 0; 409 410 return rdev_deauth(rdev, dev, &req); 411 } 412 413 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev, 414 struct net_device *dev, const u8 *ap_addr, 415 const u8 *ie, int ie_len, u16 reason, 416 bool local_state_change) 417 { 418 struct wireless_dev *wdev = dev->ieee80211_ptr; 419 struct cfg80211_disassoc_request req = { 420 .reason_code = reason, 421 .local_state_change = local_state_change, 422 .ie = ie, 423 .ie_len = ie_len, 424 .ap_addr = ap_addr, 425 }; 426 int err; 427 428 ASSERT_WDEV_LOCK(wdev); 429 430 if (!wdev->connected) 431 return -ENOTCONN; 432 433 if (memcmp(wdev->u.client.connected_addr, ap_addr, ETH_ALEN)) 434 return -ENOTCONN; 435 436 err = rdev_disassoc(rdev, dev, &req); 437 if (err) 438 return err; 439 440 /* driver should have reported the disassoc */ 441 WARN_ON(wdev->connected); 442 return 0; 443 } 444 445 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev, 446 struct net_device *dev) 447 { 448 struct wireless_dev *wdev = dev->ieee80211_ptr; 449 u8 bssid[ETH_ALEN]; 450 451 ASSERT_WDEV_LOCK(wdev); 452 453 if (!rdev->ops->deauth) 454 return; 455 456 if (!wdev->connected) 457 return; 458 459 memcpy(bssid, wdev->u.client.connected_addr, ETH_ALEN); 460 cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0, 461 WLAN_REASON_DEAUTH_LEAVING, false); 462 } 463 464 struct cfg80211_mgmt_registration { 465 struct list_head list; 466 struct wireless_dev *wdev; 467 468 u32 nlportid; 469 470 int match_len; 471 472 __le16 frame_type; 473 474 bool multicast_rx; 475 476 u8 match[]; 477 }; 478 479 static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev) 480 { 481 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 482 struct wireless_dev *tmp; 483 struct cfg80211_mgmt_registration *reg; 484 struct mgmt_frame_regs upd = {}; 485 486 lockdep_assert_held(&rdev->wiphy.mtx); 487 488 spin_lock_bh(&rdev->mgmt_registrations_lock); 489 if (!wdev->mgmt_registrations_need_update) { 490 spin_unlock_bh(&rdev->mgmt_registrations_lock); 491 return; 492 } 493 494 rcu_read_lock(); 495 list_for_each_entry_rcu(tmp, &rdev->wiphy.wdev_list, list) { 496 list_for_each_entry(reg, &tmp->mgmt_registrations, list) { 497 u32 mask = BIT(le16_to_cpu(reg->frame_type) >> 4); 498 u32 mcast_mask = 0; 499 500 if (reg->multicast_rx) 501 mcast_mask = mask; 502 503 upd.global_stypes |= mask; 504 upd.global_mcast_stypes |= mcast_mask; 505 506 if (tmp == wdev) { 507 upd.interface_stypes |= mask; 508 upd.interface_mcast_stypes |= mcast_mask; 509 } 510 } 511 } 512 rcu_read_unlock(); 513 514 wdev->mgmt_registrations_need_update = 0; 515 spin_unlock_bh(&rdev->mgmt_registrations_lock); 516 517 rdev_update_mgmt_frame_registrations(rdev, wdev, &upd); 518 } 519 520 void cfg80211_mgmt_registrations_update_wk(struct work_struct *wk) 521 { 522 struct cfg80211_registered_device *rdev; 523 struct wireless_dev *wdev; 524 525 rdev = container_of(wk, struct cfg80211_registered_device, 526 mgmt_registrations_update_wk); 527 528 wiphy_lock(&rdev->wiphy); 529 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) 530 cfg80211_mgmt_registrations_update(wdev); 531 wiphy_unlock(&rdev->wiphy); 532 } 533 534 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid, 535 u16 frame_type, const u8 *match_data, 536 int match_len, bool multicast_rx, 537 struct netlink_ext_ack *extack) 538 { 539 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 540 struct cfg80211_mgmt_registration *reg, *nreg; 541 int err = 0; 542 u16 mgmt_type; 543 bool update_multicast = false; 544 545 if (!wdev->wiphy->mgmt_stypes) 546 return -EOPNOTSUPP; 547 548 if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT) { 549 NL_SET_ERR_MSG(extack, "frame type not management"); 550 return -EINVAL; 551 } 552 553 if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) { 554 NL_SET_ERR_MSG(extack, "Invalid frame type"); 555 return -EINVAL; 556 } 557 558 mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4; 559 if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type))) { 560 NL_SET_ERR_MSG(extack, 561 "Registration to specific type not supported"); 562 return -EINVAL; 563 } 564 565 /* 566 * To support Pre Association Security Negotiation (PASN), registration 567 * for authentication frames should be supported. However, as some 568 * versions of the user space daemons wrongly register to all types of 569 * authentication frames (which might result in unexpected behavior) 570 * allow such registration if the request is for a specific 571 * authentication algorithm number. 572 */ 573 if (wdev->iftype == NL80211_IFTYPE_STATION && 574 (frame_type & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_AUTH && 575 !(match_data && match_len >= 2)) { 576 NL_SET_ERR_MSG(extack, 577 "Authentication algorithm number required"); 578 return -EINVAL; 579 } 580 581 nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL); 582 if (!nreg) 583 return -ENOMEM; 584 585 spin_lock_bh(&rdev->mgmt_registrations_lock); 586 587 list_for_each_entry(reg, &wdev->mgmt_registrations, list) { 588 int mlen = min(match_len, reg->match_len); 589 590 if (frame_type != le16_to_cpu(reg->frame_type)) 591 continue; 592 593 if (memcmp(reg->match, match_data, mlen) == 0) { 594 if (reg->multicast_rx != multicast_rx) { 595 update_multicast = true; 596 reg->multicast_rx = multicast_rx; 597 break; 598 } 599 NL_SET_ERR_MSG(extack, "Match already configured"); 600 err = -EALREADY; 601 break; 602 } 603 } 604 605 if (err) 606 goto out; 607 608 if (update_multicast) { 609 kfree(nreg); 610 } else { 611 memcpy(nreg->match, match_data, match_len); 612 nreg->match_len = match_len; 613 nreg->nlportid = snd_portid; 614 nreg->frame_type = cpu_to_le16(frame_type); 615 nreg->wdev = wdev; 616 nreg->multicast_rx = multicast_rx; 617 list_add(&nreg->list, &wdev->mgmt_registrations); 618 } 619 wdev->mgmt_registrations_need_update = 1; 620 spin_unlock_bh(&rdev->mgmt_registrations_lock); 621 622 cfg80211_mgmt_registrations_update(wdev); 623 624 return 0; 625 626 out: 627 kfree(nreg); 628 spin_unlock_bh(&rdev->mgmt_registrations_lock); 629 630 return err; 631 } 632 633 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid) 634 { 635 struct wiphy *wiphy = wdev->wiphy; 636 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 637 struct cfg80211_mgmt_registration *reg, *tmp; 638 639 spin_lock_bh(&rdev->mgmt_registrations_lock); 640 641 list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) { 642 if (reg->nlportid != nlportid) 643 continue; 644 645 list_del(®->list); 646 kfree(reg); 647 648 wdev->mgmt_registrations_need_update = 1; 649 schedule_work(&rdev->mgmt_registrations_update_wk); 650 } 651 652 spin_unlock_bh(&rdev->mgmt_registrations_lock); 653 654 if (nlportid && rdev->crit_proto_nlportid == nlportid) { 655 rdev->crit_proto_nlportid = 0; 656 rdev_crit_proto_stop(rdev, wdev); 657 } 658 659 if (nlportid == wdev->ap_unexpected_nlportid) 660 wdev->ap_unexpected_nlportid = 0; 661 } 662 663 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev) 664 { 665 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 666 struct cfg80211_mgmt_registration *reg, *tmp; 667 668 spin_lock_bh(&rdev->mgmt_registrations_lock); 669 list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) { 670 list_del(®->list); 671 kfree(reg); 672 } 673 wdev->mgmt_registrations_need_update = 1; 674 spin_unlock_bh(&rdev->mgmt_registrations_lock); 675 676 cfg80211_mgmt_registrations_update(wdev); 677 } 678 679 static bool cfg80211_allowed_address(struct wireless_dev *wdev, const u8 *addr) 680 { 681 int i; 682 683 for_each_valid_link(wdev, i) { 684 if (ether_addr_equal(addr, wdev->links[i].addr)) 685 return true; 686 } 687 688 return ether_addr_equal(addr, wdev_address(wdev)); 689 } 690 691 static bool cfg80211_allowed_random_address(struct wireless_dev *wdev, 692 const struct ieee80211_mgmt *mgmt) 693 { 694 if (ieee80211_is_auth(mgmt->frame_control) || 695 ieee80211_is_deauth(mgmt->frame_control)) { 696 /* Allow random TA to be used with authentication and 697 * deauthentication frames if the driver has indicated support. 698 */ 699 if (wiphy_ext_feature_isset( 700 wdev->wiphy, 701 NL80211_EXT_FEATURE_AUTH_AND_DEAUTH_RANDOM_TA)) 702 return true; 703 } else if (ieee80211_is_action(mgmt->frame_control) && 704 mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) { 705 /* Allow random TA to be used with Public Action frames if the 706 * driver has indicated support. 707 */ 708 if (!wdev->connected && 709 wiphy_ext_feature_isset( 710 wdev->wiphy, 711 NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA)) 712 return true; 713 714 if (wdev->connected && 715 wiphy_ext_feature_isset( 716 wdev->wiphy, 717 NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED)) 718 return true; 719 } 720 721 return false; 722 } 723 724 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev, 725 struct wireless_dev *wdev, 726 struct cfg80211_mgmt_tx_params *params, u64 *cookie) 727 { 728 const struct ieee80211_mgmt *mgmt; 729 u16 stype; 730 731 if (!wdev->wiphy->mgmt_stypes) 732 return -EOPNOTSUPP; 733 734 if (!rdev->ops->mgmt_tx) 735 return -EOPNOTSUPP; 736 737 if (params->len < 24 + 1) 738 return -EINVAL; 739 740 mgmt = (const struct ieee80211_mgmt *)params->buf; 741 742 if (!ieee80211_is_mgmt(mgmt->frame_control)) 743 return -EINVAL; 744 745 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE; 746 if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4))) 747 return -EINVAL; 748 749 if (ieee80211_is_action(mgmt->frame_control) && 750 mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) { 751 int err = 0; 752 753 wdev_lock(wdev); 754 755 switch (wdev->iftype) { 756 case NL80211_IFTYPE_ADHOC: 757 /* 758 * check for IBSS DA must be done by driver as 759 * cfg80211 doesn't track the stations 760 */ 761 if (!wdev->u.ibss.current_bss || 762 !ether_addr_equal(wdev->u.ibss.current_bss->pub.bssid, 763 mgmt->bssid)) { 764 err = -ENOTCONN; 765 break; 766 } 767 break; 768 case NL80211_IFTYPE_STATION: 769 case NL80211_IFTYPE_P2P_CLIENT: 770 if (!wdev->connected) { 771 err = -ENOTCONN; 772 break; 773 } 774 775 /* FIXME: MLD may address this differently */ 776 777 if (!ether_addr_equal(wdev->u.client.connected_addr, 778 mgmt->bssid)) { 779 err = -ENOTCONN; 780 break; 781 } 782 783 /* for station, check that DA is the AP */ 784 if (!ether_addr_equal(wdev->u.client.connected_addr, 785 mgmt->da)) { 786 err = -ENOTCONN; 787 break; 788 } 789 break; 790 case NL80211_IFTYPE_AP: 791 case NL80211_IFTYPE_P2P_GO: 792 case NL80211_IFTYPE_AP_VLAN: 793 if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)) && 794 (params->link_id < 0 || 795 !ether_addr_equal(mgmt->bssid, 796 wdev->links[params->link_id].addr))) 797 err = -EINVAL; 798 break; 799 case NL80211_IFTYPE_MESH_POINT: 800 if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) { 801 err = -EINVAL; 802 break; 803 } 804 /* 805 * check for mesh DA must be done by driver as 806 * cfg80211 doesn't track the stations 807 */ 808 break; 809 case NL80211_IFTYPE_P2P_DEVICE: 810 /* 811 * fall through, P2P device only supports 812 * public action frames 813 */ 814 case NL80211_IFTYPE_NAN: 815 default: 816 err = -EOPNOTSUPP; 817 break; 818 } 819 wdev_unlock(wdev); 820 821 if (err) 822 return err; 823 } 824 825 if (!cfg80211_allowed_address(wdev, mgmt->sa) && 826 !cfg80211_allowed_random_address(wdev, mgmt)) 827 return -EINVAL; 828 829 /* Transmit the management frame as requested by user space */ 830 return rdev_mgmt_tx(rdev, wdev, params, cookie); 831 } 832 833 bool cfg80211_rx_mgmt_ext(struct wireless_dev *wdev, 834 struct cfg80211_rx_info *info) 835 { 836 struct wiphy *wiphy = wdev->wiphy; 837 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 838 struct cfg80211_mgmt_registration *reg; 839 const struct ieee80211_txrx_stypes *stypes = 840 &wiphy->mgmt_stypes[wdev->iftype]; 841 struct ieee80211_mgmt *mgmt = (void *)info->buf; 842 const u8 *data; 843 int data_len; 844 bool result = false; 845 __le16 ftype = mgmt->frame_control & 846 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE); 847 u16 stype; 848 849 trace_cfg80211_rx_mgmt(wdev, info); 850 stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4; 851 852 if (!(stypes->rx & BIT(stype))) { 853 trace_cfg80211_return_bool(false); 854 return false; 855 } 856 857 data = info->buf + ieee80211_hdrlen(mgmt->frame_control); 858 data_len = info->len - ieee80211_hdrlen(mgmt->frame_control); 859 860 spin_lock_bh(&rdev->mgmt_registrations_lock); 861 862 list_for_each_entry(reg, &wdev->mgmt_registrations, list) { 863 if (reg->frame_type != ftype) 864 continue; 865 866 if (reg->match_len > data_len) 867 continue; 868 869 if (memcmp(reg->match, data, reg->match_len)) 870 continue; 871 872 /* found match! */ 873 874 /* Indicate the received Action frame to user space */ 875 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid, info, 876 GFP_ATOMIC)) 877 continue; 878 879 result = true; 880 break; 881 } 882 883 spin_unlock_bh(&rdev->mgmt_registrations_lock); 884 885 trace_cfg80211_return_bool(result); 886 return result; 887 } 888 EXPORT_SYMBOL(cfg80211_rx_mgmt_ext); 889 890 void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev) 891 { 892 cancel_delayed_work(&rdev->dfs_update_channels_wk); 893 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0); 894 } 895 896 void cfg80211_dfs_channels_update_work(struct work_struct *work) 897 { 898 struct delayed_work *delayed_work = to_delayed_work(work); 899 struct cfg80211_registered_device *rdev; 900 struct cfg80211_chan_def chandef; 901 struct ieee80211_supported_band *sband; 902 struct ieee80211_channel *c; 903 struct wiphy *wiphy; 904 bool check_again = false; 905 unsigned long timeout, next_time = 0; 906 unsigned long time_dfs_update; 907 enum nl80211_radar_event radar_event; 908 int bandid, i; 909 910 rdev = container_of(delayed_work, struct cfg80211_registered_device, 911 dfs_update_channels_wk); 912 wiphy = &rdev->wiphy; 913 914 rtnl_lock(); 915 for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) { 916 sband = wiphy->bands[bandid]; 917 if (!sband) 918 continue; 919 920 for (i = 0; i < sband->n_channels; i++) { 921 c = &sband->channels[i]; 922 923 if (!(c->flags & IEEE80211_CHAN_RADAR)) 924 continue; 925 926 if (c->dfs_state != NL80211_DFS_UNAVAILABLE && 927 c->dfs_state != NL80211_DFS_AVAILABLE) 928 continue; 929 930 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) { 931 time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS; 932 radar_event = NL80211_RADAR_NOP_FINISHED; 933 } else { 934 if (regulatory_pre_cac_allowed(wiphy) || 935 cfg80211_any_wiphy_oper_chan(wiphy, c)) 936 continue; 937 938 time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS; 939 radar_event = NL80211_RADAR_PRE_CAC_EXPIRED; 940 } 941 942 timeout = c->dfs_state_entered + 943 msecs_to_jiffies(time_dfs_update); 944 945 if (time_after_eq(jiffies, timeout)) { 946 c->dfs_state = NL80211_DFS_USABLE; 947 c->dfs_state_entered = jiffies; 948 949 cfg80211_chandef_create(&chandef, c, 950 NL80211_CHAN_NO_HT); 951 952 nl80211_radar_notify(rdev, &chandef, 953 radar_event, NULL, 954 GFP_ATOMIC); 955 956 regulatory_propagate_dfs_state(wiphy, &chandef, 957 c->dfs_state, 958 radar_event); 959 continue; 960 } 961 962 if (!check_again) 963 next_time = timeout - jiffies; 964 else 965 next_time = min(next_time, timeout - jiffies); 966 check_again = true; 967 } 968 } 969 rtnl_unlock(); 970 971 /* reschedule if there are other channels waiting to be cleared again */ 972 if (check_again) 973 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 974 next_time); 975 } 976 977 978 void __cfg80211_radar_event(struct wiphy *wiphy, 979 struct cfg80211_chan_def *chandef, 980 bool offchan, gfp_t gfp) 981 { 982 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 983 984 trace_cfg80211_radar_event(wiphy, chandef, offchan); 985 986 /* only set the chandef supplied channel to unavailable, in 987 * case the radar is detected on only one of multiple channels 988 * spanned by the chandef. 989 */ 990 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE); 991 992 if (offchan) 993 queue_work(cfg80211_wq, &rdev->background_cac_abort_wk); 994 995 cfg80211_sched_dfs_chan_update(rdev); 996 997 nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp); 998 999 memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def)); 1000 queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk); 1001 } 1002 EXPORT_SYMBOL(__cfg80211_radar_event); 1003 1004 void cfg80211_cac_event(struct net_device *netdev, 1005 const struct cfg80211_chan_def *chandef, 1006 enum nl80211_radar_event event, gfp_t gfp) 1007 { 1008 struct wireless_dev *wdev = netdev->ieee80211_ptr; 1009 struct wiphy *wiphy = wdev->wiphy; 1010 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1011 unsigned long timeout; 1012 1013 /* not yet supported */ 1014 if (wdev->valid_links) 1015 return; 1016 1017 trace_cfg80211_cac_event(netdev, event); 1018 1019 if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED)) 1020 return; 1021 1022 switch (event) { 1023 case NL80211_RADAR_CAC_FINISHED: 1024 timeout = wdev->cac_start_time + 1025 msecs_to_jiffies(wdev->cac_time_ms); 1026 WARN_ON(!time_after_eq(jiffies, timeout)); 1027 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE); 1028 memcpy(&rdev->cac_done_chandef, chandef, 1029 sizeof(struct cfg80211_chan_def)); 1030 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk); 1031 cfg80211_sched_dfs_chan_update(rdev); 1032 fallthrough; 1033 case NL80211_RADAR_CAC_ABORTED: 1034 wdev->cac_started = false; 1035 break; 1036 case NL80211_RADAR_CAC_STARTED: 1037 wdev->cac_started = true; 1038 break; 1039 default: 1040 WARN_ON(1); 1041 return; 1042 } 1043 1044 nl80211_radar_notify(rdev, chandef, event, netdev, gfp); 1045 } 1046 EXPORT_SYMBOL(cfg80211_cac_event); 1047 1048 static void 1049 __cfg80211_background_cac_event(struct cfg80211_registered_device *rdev, 1050 struct wireless_dev *wdev, 1051 const struct cfg80211_chan_def *chandef, 1052 enum nl80211_radar_event event) 1053 { 1054 struct wiphy *wiphy = &rdev->wiphy; 1055 struct net_device *netdev; 1056 1057 lockdep_assert_wiphy(&rdev->wiphy); 1058 1059 if (!cfg80211_chandef_valid(chandef)) 1060 return; 1061 1062 if (!rdev->background_radar_wdev) 1063 return; 1064 1065 switch (event) { 1066 case NL80211_RADAR_CAC_FINISHED: 1067 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE); 1068 memcpy(&rdev->cac_done_chandef, chandef, sizeof(*chandef)); 1069 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk); 1070 cfg80211_sched_dfs_chan_update(rdev); 1071 wdev = rdev->background_radar_wdev; 1072 break; 1073 case NL80211_RADAR_CAC_ABORTED: 1074 if (!cancel_delayed_work(&rdev->background_cac_done_wk)) 1075 return; 1076 wdev = rdev->background_radar_wdev; 1077 break; 1078 case NL80211_RADAR_CAC_STARTED: 1079 break; 1080 default: 1081 return; 1082 } 1083 1084 netdev = wdev ? wdev->netdev : NULL; 1085 nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL); 1086 } 1087 1088 static void 1089 cfg80211_background_cac_event(struct cfg80211_registered_device *rdev, 1090 const struct cfg80211_chan_def *chandef, 1091 enum nl80211_radar_event event) 1092 { 1093 wiphy_lock(&rdev->wiphy); 1094 __cfg80211_background_cac_event(rdev, rdev->background_radar_wdev, 1095 chandef, event); 1096 wiphy_unlock(&rdev->wiphy); 1097 } 1098 1099 void cfg80211_background_cac_done_wk(struct work_struct *work) 1100 { 1101 struct delayed_work *delayed_work = to_delayed_work(work); 1102 struct cfg80211_registered_device *rdev; 1103 1104 rdev = container_of(delayed_work, struct cfg80211_registered_device, 1105 background_cac_done_wk); 1106 cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef, 1107 NL80211_RADAR_CAC_FINISHED); 1108 } 1109 1110 void cfg80211_background_cac_abort_wk(struct work_struct *work) 1111 { 1112 struct cfg80211_registered_device *rdev; 1113 1114 rdev = container_of(work, struct cfg80211_registered_device, 1115 background_cac_abort_wk); 1116 cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef, 1117 NL80211_RADAR_CAC_ABORTED); 1118 } 1119 1120 void cfg80211_background_cac_abort(struct wiphy *wiphy) 1121 { 1122 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1123 1124 queue_work(cfg80211_wq, &rdev->background_cac_abort_wk); 1125 } 1126 EXPORT_SYMBOL(cfg80211_background_cac_abort); 1127 1128 int 1129 cfg80211_start_background_radar_detection(struct cfg80211_registered_device *rdev, 1130 struct wireless_dev *wdev, 1131 struct cfg80211_chan_def *chandef) 1132 { 1133 unsigned int cac_time_ms; 1134 int err; 1135 1136 lockdep_assert_wiphy(&rdev->wiphy); 1137 1138 if (!wiphy_ext_feature_isset(&rdev->wiphy, 1139 NL80211_EXT_FEATURE_RADAR_BACKGROUND)) 1140 return -EOPNOTSUPP; 1141 1142 /* Offchannel chain already locked by another wdev */ 1143 if (rdev->background_radar_wdev && rdev->background_radar_wdev != wdev) 1144 return -EBUSY; 1145 1146 /* CAC already in progress on the offchannel chain */ 1147 if (rdev->background_radar_wdev == wdev && 1148 delayed_work_pending(&rdev->background_cac_done_wk)) 1149 return -EBUSY; 1150 1151 err = rdev_set_radar_background(rdev, chandef); 1152 if (err) 1153 return err; 1154 1155 cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, chandef); 1156 if (!cac_time_ms) 1157 cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS; 1158 1159 rdev->background_radar_chandef = *chandef; 1160 rdev->background_radar_wdev = wdev; /* Get offchain ownership */ 1161 1162 __cfg80211_background_cac_event(rdev, wdev, chandef, 1163 NL80211_RADAR_CAC_STARTED); 1164 queue_delayed_work(cfg80211_wq, &rdev->background_cac_done_wk, 1165 msecs_to_jiffies(cac_time_ms)); 1166 1167 return 0; 1168 } 1169 1170 void cfg80211_stop_background_radar_detection(struct wireless_dev *wdev) 1171 { 1172 struct wiphy *wiphy = wdev->wiphy; 1173 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1174 1175 lockdep_assert_wiphy(wiphy); 1176 1177 if (wdev != rdev->background_radar_wdev) 1178 return; 1179 1180 rdev_set_radar_background(rdev, NULL); 1181 rdev->background_radar_wdev = NULL; /* Release offchain ownership */ 1182 1183 __cfg80211_background_cac_event(rdev, wdev, 1184 &rdev->background_radar_chandef, 1185 NL80211_RADAR_CAC_ABORTED); 1186 } 1187