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