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].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 
cfg80211_process_auth(struct wireless_dev * wdev,const u8 * buf,size_t len)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 
cfg80211_process_deauth(struct wireless_dev * wdev,const u8 * buf,size_t len,bool reconnect)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 
cfg80211_process_disassoc(struct wireless_dev * wdev,const u8 * buf,size_t len,bool reconnect)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 
cfg80211_rx_mlme_mgmt(struct net_device * dev,const u8 * buf,size_t len)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 
cfg80211_auth_timeout(struct net_device * dev,const u8 * addr)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 
cfg80211_assoc_failure(struct net_device * dev,struct cfg80211_assoc_failure * data)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 
cfg80211_tx_mlme_mgmt(struct net_device * dev,const u8 * buf,size_t len,bool reconnect)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 
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)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 */
cfg80211_mlme_auth(struct cfg80211_registered_device * rdev,struct net_device * dev,struct cfg80211_auth_request * req)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.  */
cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap * ht_capa,const struct ieee80211_ht_cap * 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.  */
cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap * vht_capa,const struct ieee80211_vht_cap * 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 */
cfg80211_mlme_assoc(struct cfg80211_registered_device * rdev,struct net_device * dev,struct cfg80211_assoc_request * req)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 
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)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 
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)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 
cfg80211_mlme_down(struct cfg80211_registered_device * rdev,struct net_device * dev)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 
cfg80211_mgmt_registrations_update(struct wireless_dev * wdev)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 
cfg80211_mgmt_registrations_update_wk(struct work_struct * wk)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 
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)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 
cfg80211_mlme_unregister_socket(struct wireless_dev * wdev,u32 nlportid)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(&reg->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 
cfg80211_mlme_purge_registrations(struct wireless_dev * wdev)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(&reg->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 
cfg80211_allowed_address(struct wireless_dev * wdev,const u8 * addr)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 
cfg80211_allowed_random_address(struct wireless_dev * wdev,const struct ieee80211_mgmt * mgmt)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 
cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,struct cfg80211_mgmt_tx_params * params,u64 * cookie)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 
cfg80211_rx_mgmt_ext(struct wireless_dev * wdev,struct cfg80211_rx_info * info)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 
cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device * rdev)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 
cfg80211_dfs_channels_update_work(struct work_struct * work)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 
__cfg80211_radar_event(struct wiphy * wiphy,struct cfg80211_chan_def * chandef,bool offchan,gfp_t gfp)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 
cfg80211_cac_event(struct net_device * netdev,const struct cfg80211_chan_def * chandef,enum nl80211_radar_event event,gfp_t gfp)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
__cfg80211_background_cac_event(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,const struct cfg80211_chan_def * chandef,enum nl80211_radar_event event)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
cfg80211_background_cac_event(struct cfg80211_registered_device * rdev,const struct cfg80211_chan_def * chandef,enum nl80211_radar_event event)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 
cfg80211_background_cac_done_wk(struct work_struct * work)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 
cfg80211_background_cac_abort_wk(struct work_struct * work)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 
cfg80211_background_cac_abort(struct wiphy * wiphy)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
cfg80211_start_background_radar_detection(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,struct cfg80211_chan_def * chandef)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 
cfg80211_stop_background_radar_detection(struct wireless_dev * wdev)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