xref: /linux/net/wireless/mlme.c (revision 8be4d31cb8aaeea27bde4b7ddb26e28a89062ebf)
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, 2022-2025 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,const struct cfg80211_rx_assoc_resp_data * data)24 void cfg80211_rx_assoc_resp(struct net_device *dev,
25 			    const struct cfg80211_rx_assoc_resp_data *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 	lockdep_assert_wiphy(wdev->wiphy);
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 	lockdep_assert_wiphy(wdev->wiphy);
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 		memset(&wrqu, 0, sizeof(wrqu));
245 		wrqu.data.length =
246 			sprintf(buf, "MLME-MICHAELMICFAILURE."
247 				"indication(keyid=%d %scast addr=%pM)",
248 				key_id, key_type == NL80211_KEYTYPE_GROUP
249 				? "broad" : "uni", addr);
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 	lockdep_assert_wiphy(wdev->wiphy);
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 static int
cfg80211_mlme_check_mlo_compat(const struct ieee80211_multi_link_elem * mle_a,const struct ieee80211_multi_link_elem * mle_b,struct netlink_ext_ack * extack)329 cfg80211_mlme_check_mlo_compat(const struct ieee80211_multi_link_elem *mle_a,
330 			       const struct ieee80211_multi_link_elem *mle_b,
331 			       struct netlink_ext_ack *extack)
332 {
333 	const struct ieee80211_mle_basic_common_info *common_a, *common_b;
334 
335 	common_a = (const void *)mle_a->variable;
336 	common_b = (const void *)mle_b->variable;
337 
338 	if (memcmp(common_a->mld_mac_addr, common_b->mld_mac_addr, ETH_ALEN)) {
339 		NL_SET_ERR_MSG(extack, "AP MLD address mismatch");
340 		return -EINVAL;
341 	}
342 
343 	if (ieee80211_mle_get_eml_cap((const u8 *)mle_a) !=
344 	    ieee80211_mle_get_eml_cap((const u8 *)mle_b)) {
345 		NL_SET_ERR_MSG(extack, "link EML capabilities mismatch");
346 		return -EINVAL;
347 	}
348 
349 	if (ieee80211_mle_get_mld_capa_op((const u8 *)mle_a) !=
350 	    ieee80211_mle_get_mld_capa_op((const u8 *)mle_b)) {
351 		NL_SET_ERR_MSG(extack, "link MLD capabilities/ops mismatch");
352 		return -EINVAL;
353 	}
354 
355 	/*
356 	 * Only verify the values in Extended MLD Capabilities that are
357 	 * not reserved when transmitted by an AP (and expected to remain the
358 	 * same over time).
359 	 * The Recommended Max Simultaneous Links subfield in particular is
360 	 * reserved when included in a unicast Probe Response frame and may
361 	 * also change when the AP adds/removes links. The BTM MLD
362 	 * Recommendation For Multiple APs Support subfield is reserved when
363 	 * transmitted by an AP. All other bits are currently reserved.
364 	 * See IEEE P802.11be/D7.0, Table 9-417o.
365 	 */
366 	if ((ieee80211_mle_get_ext_mld_capa_op((const u8 *)mle_a) &
367 	     (IEEE80211_EHT_ML_EXT_MLD_CAPA_OP_PARAM_UPDATE |
368 	      IEEE80211_EHT_ML_EXT_MLD_CAPA_NSTR_UPDATE |
369 	      IEEE80211_EHT_ML_EXT_MLD_CAPA_EMLSR_ENA_ON_ONE_LINK)) !=
370 	    (ieee80211_mle_get_ext_mld_capa_op((const u8 *)mle_b) &
371 	     (IEEE80211_EHT_ML_EXT_MLD_CAPA_OP_PARAM_UPDATE |
372 	      IEEE80211_EHT_ML_EXT_MLD_CAPA_NSTR_UPDATE |
373 	      IEEE80211_EHT_ML_EXT_MLD_CAPA_EMLSR_ENA_ON_ONE_LINK))) {
374 		NL_SET_ERR_MSG(extack,
375 			       "extended link MLD capabilities/ops mismatch");
376 		return -EINVAL;
377 	}
378 
379 	return 0;
380 }
381 
cfg80211_mlme_check_mlo(struct net_device * dev,struct cfg80211_assoc_request * req,struct netlink_ext_ack * extack)382 static int cfg80211_mlme_check_mlo(struct net_device *dev,
383 				   struct cfg80211_assoc_request *req,
384 				   struct netlink_ext_ack *extack)
385 {
386 	const struct ieee80211_multi_link_elem *mles[ARRAY_SIZE(req->links)] = {};
387 	int i;
388 
389 	if (req->link_id < 0)
390 		return 0;
391 
392 	if (!req->links[req->link_id].bss) {
393 		NL_SET_ERR_MSG(extack, "no BSS for assoc link");
394 		return -EINVAL;
395 	}
396 
397 	rcu_read_lock();
398 	for (i = 0; i < ARRAY_SIZE(req->links); i++) {
399 		const struct cfg80211_bss_ies *ies;
400 		const struct element *ml;
401 
402 		if (!req->links[i].bss)
403 			continue;
404 
405 		if (ether_addr_equal(req->links[i].bss->bssid, dev->dev_addr)) {
406 			NL_SET_ERR_MSG(extack, "BSSID must not be our address");
407 			req->links[i].error = -EINVAL;
408 			goto error;
409 		}
410 
411 		ies = rcu_dereference(req->links[i].bss->ies);
412 		ml = cfg80211_find_ext_elem(WLAN_EID_EXT_EHT_MULTI_LINK,
413 					    ies->data, ies->len);
414 		if (!ml) {
415 			NL_SET_ERR_MSG(extack, "MLO BSS w/o ML element");
416 			req->links[i].error = -EINVAL;
417 			goto error;
418 		}
419 
420 		if (!ieee80211_mle_type_ok(ml->data + 1,
421 					   IEEE80211_ML_CONTROL_TYPE_BASIC,
422 					   ml->datalen - 1)) {
423 			NL_SET_ERR_MSG(extack, "BSS with invalid ML element");
424 			req->links[i].error = -EINVAL;
425 			goto error;
426 		}
427 
428 		mles[i] = (const void *)(ml->data + 1);
429 
430 		if (ieee80211_mle_get_link_id((const u8 *)mles[i]) != i) {
431 			NL_SET_ERR_MSG(extack, "link ID mismatch");
432 			req->links[i].error = -EINVAL;
433 			goto error;
434 		}
435 	}
436 
437 	if (WARN_ON(!mles[req->link_id]))
438 		goto error;
439 
440 	for (i = 0; i < ARRAY_SIZE(req->links); i++) {
441 		if (i == req->link_id || !req->links[i].bss)
442 			continue;
443 
444 		if (WARN_ON(!mles[i]))
445 			goto error;
446 
447 		if (cfg80211_mlme_check_mlo_compat(mles[req->link_id], mles[i],
448 						   extack)) {
449 			req->links[i].error = -EINVAL;
450 			goto error;
451 		}
452 	}
453 
454 	rcu_read_unlock();
455 	return 0;
456 error:
457 	rcu_read_unlock();
458 	return -EINVAL;
459 }
460 
461 /* 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,struct netlink_ext_ack * extack)462 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
463 			struct net_device *dev,
464 			struct cfg80211_assoc_request *req,
465 			struct netlink_ext_ack *extack)
466 {
467 	struct wireless_dev *wdev = dev->ieee80211_ptr;
468 	int err;
469 
470 	lockdep_assert_wiphy(wdev->wiphy);
471 
472 	err = cfg80211_mlme_check_mlo(dev, req, extack);
473 	if (err)
474 		return err;
475 
476 	if (wdev->connected &&
477 	    (!req->prev_bssid ||
478 	     !ether_addr_equal(wdev->u.client.connected_addr, req->prev_bssid)))
479 		return -EALREADY;
480 
481 	if ((req->bss && ether_addr_equal(req->bss->bssid, dev->dev_addr)) ||
482 	    (req->link_id >= 0 &&
483 	     ether_addr_equal(req->ap_mld_addr, dev->dev_addr)))
484 		return -EINVAL;
485 
486 	cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
487 				  rdev->wiphy.ht_capa_mod_mask);
488 	cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
489 				   rdev->wiphy.vht_capa_mod_mask);
490 
491 	err = rdev_assoc(rdev, dev, req);
492 	if (!err) {
493 		int link_id;
494 
495 		if (req->bss) {
496 			cfg80211_ref_bss(&rdev->wiphy, req->bss);
497 			cfg80211_hold_bss(bss_from_pub(req->bss));
498 		}
499 
500 		for (link_id = 0; link_id < ARRAY_SIZE(req->links); link_id++) {
501 			if (!req->links[link_id].bss)
502 				continue;
503 			cfg80211_ref_bss(&rdev->wiphy, req->links[link_id].bss);
504 			cfg80211_hold_bss(bss_from_pub(req->links[link_id].bss));
505 		}
506 	}
507 	return err;
508 }
509 
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)510 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
511 			 struct net_device *dev, const u8 *bssid,
512 			 const u8 *ie, int ie_len, u16 reason,
513 			 bool local_state_change)
514 {
515 	struct wireless_dev *wdev = dev->ieee80211_ptr;
516 	struct cfg80211_deauth_request req = {
517 		.bssid = bssid,
518 		.reason_code = reason,
519 		.ie = ie,
520 		.ie_len = ie_len,
521 		.local_state_change = local_state_change,
522 	};
523 
524 	lockdep_assert_wiphy(wdev->wiphy);
525 
526 	if (local_state_change &&
527 	    (!wdev->connected ||
528 	     !ether_addr_equal(wdev->u.client.connected_addr, bssid)))
529 		return 0;
530 
531 	if (ether_addr_equal(wdev->disconnect_bssid, bssid) ||
532 	    (wdev->connected &&
533 	     ether_addr_equal(wdev->u.client.connected_addr, bssid)))
534 		wdev->conn_owner_nlportid = 0;
535 
536 	return rdev_deauth(rdev, dev, &req);
537 }
538 
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)539 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
540 			   struct net_device *dev, const u8 *ap_addr,
541 			   const u8 *ie, int ie_len, u16 reason,
542 			   bool local_state_change)
543 {
544 	struct wireless_dev *wdev = dev->ieee80211_ptr;
545 	struct cfg80211_disassoc_request req = {
546 		.reason_code = reason,
547 		.local_state_change = local_state_change,
548 		.ie = ie,
549 		.ie_len = ie_len,
550 		.ap_addr = ap_addr,
551 	};
552 	int err;
553 
554 	lockdep_assert_wiphy(wdev->wiphy);
555 
556 	if (!wdev->connected)
557 		return -ENOTCONN;
558 
559 	if (memcmp(wdev->u.client.connected_addr, ap_addr, ETH_ALEN))
560 		return -ENOTCONN;
561 
562 	err = rdev_disassoc(rdev, dev, &req);
563 	if (err)
564 		return err;
565 
566 	/* driver should have reported the disassoc */
567 	WARN_ON(wdev->connected);
568 	return 0;
569 }
570 
cfg80211_mlme_down(struct cfg80211_registered_device * rdev,struct net_device * dev)571 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
572 			struct net_device *dev)
573 {
574 	struct wireless_dev *wdev = dev->ieee80211_ptr;
575 	u8 bssid[ETH_ALEN];
576 
577 	lockdep_assert_wiphy(wdev->wiphy);
578 
579 	if (!rdev->ops->deauth)
580 		return;
581 
582 	if (!wdev->connected)
583 		return;
584 
585 	memcpy(bssid, wdev->u.client.connected_addr, ETH_ALEN);
586 	cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
587 			     WLAN_REASON_DEAUTH_LEAVING, false);
588 }
589 
590 struct cfg80211_mgmt_registration {
591 	struct list_head list;
592 	struct wireless_dev *wdev;
593 
594 	u32 nlportid;
595 
596 	int match_len;
597 
598 	__le16 frame_type;
599 
600 	bool multicast_rx;
601 
602 	u8 match[];
603 };
604 
cfg80211_mgmt_registrations_update(struct wireless_dev * wdev)605 static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev)
606 {
607 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
608 	struct wireless_dev *tmp;
609 	struct cfg80211_mgmt_registration *reg;
610 	struct mgmt_frame_regs upd = {};
611 
612 	lockdep_assert_held(&rdev->wiphy.mtx);
613 
614 	spin_lock_bh(&rdev->mgmt_registrations_lock);
615 	if (!wdev->mgmt_registrations_need_update) {
616 		spin_unlock_bh(&rdev->mgmt_registrations_lock);
617 		return;
618 	}
619 
620 	rcu_read_lock();
621 	list_for_each_entry_rcu(tmp, &rdev->wiphy.wdev_list, list) {
622 		list_for_each_entry(reg, &tmp->mgmt_registrations, list) {
623 			u32 mask = BIT(le16_to_cpu(reg->frame_type) >> 4);
624 			u32 mcast_mask = 0;
625 
626 			if (reg->multicast_rx)
627 				mcast_mask = mask;
628 
629 			upd.global_stypes |= mask;
630 			upd.global_mcast_stypes |= mcast_mask;
631 
632 			if (tmp == wdev) {
633 				upd.interface_stypes |= mask;
634 				upd.interface_mcast_stypes |= mcast_mask;
635 			}
636 		}
637 	}
638 	rcu_read_unlock();
639 
640 	wdev->mgmt_registrations_need_update = 0;
641 	spin_unlock_bh(&rdev->mgmt_registrations_lock);
642 
643 	rdev_update_mgmt_frame_registrations(rdev, wdev, &upd);
644 }
645 
cfg80211_mgmt_registrations_update_wk(struct work_struct * wk)646 void cfg80211_mgmt_registrations_update_wk(struct work_struct *wk)
647 {
648 	struct cfg80211_registered_device *rdev;
649 	struct wireless_dev *wdev;
650 
651 	rdev = container_of(wk, struct cfg80211_registered_device,
652 			    mgmt_registrations_update_wk);
653 
654 	guard(wiphy)(&rdev->wiphy);
655 
656 	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
657 		cfg80211_mgmt_registrations_update(wdev);
658 }
659 
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)660 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
661 				u16 frame_type, const u8 *match_data,
662 				int match_len, bool multicast_rx,
663 				struct netlink_ext_ack *extack)
664 {
665 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
666 	struct cfg80211_mgmt_registration *reg, *nreg;
667 	int err = 0;
668 	u16 mgmt_type;
669 	bool update_multicast = false;
670 
671 	if (!wdev->wiphy->mgmt_stypes)
672 		return -EOPNOTSUPP;
673 
674 	if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT) {
675 		NL_SET_ERR_MSG(extack, "frame type not management");
676 		return -EINVAL;
677 	}
678 
679 	if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) {
680 		NL_SET_ERR_MSG(extack, "Invalid frame type");
681 		return -EINVAL;
682 	}
683 
684 	mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
685 	if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type))) {
686 		NL_SET_ERR_MSG(extack,
687 			       "Registration to specific type not supported");
688 		return -EINVAL;
689 	}
690 
691 	/*
692 	 * To support Pre Association Security Negotiation (PASN), registration
693 	 * for authentication frames should be supported. However, as some
694 	 * versions of the user space daemons wrongly register to all types of
695 	 * authentication frames (which might result in unexpected behavior)
696 	 * allow such registration if the request is for a specific
697 	 * authentication algorithm number.
698 	 */
699 	if (wdev->iftype == NL80211_IFTYPE_STATION &&
700 	    (frame_type & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_AUTH &&
701 	    !(match_data && match_len >= 2)) {
702 		NL_SET_ERR_MSG(extack,
703 			       "Authentication algorithm number required");
704 		return -EINVAL;
705 	}
706 
707 	nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
708 	if (!nreg)
709 		return -ENOMEM;
710 
711 	spin_lock_bh(&rdev->mgmt_registrations_lock);
712 
713 	list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
714 		int mlen = min(match_len, reg->match_len);
715 
716 		if (frame_type != le16_to_cpu(reg->frame_type))
717 			continue;
718 
719 		if (memcmp(reg->match, match_data, mlen) == 0) {
720 			if (reg->multicast_rx != multicast_rx) {
721 				update_multicast = true;
722 				reg->multicast_rx = multicast_rx;
723 				break;
724 			}
725 			NL_SET_ERR_MSG(extack, "Match already configured");
726 			err = -EALREADY;
727 			break;
728 		}
729 	}
730 
731 	if (err)
732 		goto out;
733 
734 	if (update_multicast) {
735 		kfree(nreg);
736 	} else {
737 		memcpy(nreg->match, match_data, match_len);
738 		nreg->match_len = match_len;
739 		nreg->nlportid = snd_portid;
740 		nreg->frame_type = cpu_to_le16(frame_type);
741 		nreg->wdev = wdev;
742 		nreg->multicast_rx = multicast_rx;
743 		list_add(&nreg->list, &wdev->mgmt_registrations);
744 	}
745 	wdev->mgmt_registrations_need_update = 1;
746 	spin_unlock_bh(&rdev->mgmt_registrations_lock);
747 
748 	cfg80211_mgmt_registrations_update(wdev);
749 
750 	return 0;
751 
752  out:
753 	kfree(nreg);
754 	spin_unlock_bh(&rdev->mgmt_registrations_lock);
755 
756 	return err;
757 }
758 
cfg80211_mlme_unregister_socket(struct wireless_dev * wdev,u32 nlportid)759 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
760 {
761 	struct wiphy *wiphy = wdev->wiphy;
762 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
763 	struct cfg80211_mgmt_registration *reg, *tmp;
764 
765 	spin_lock_bh(&rdev->mgmt_registrations_lock);
766 
767 	list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
768 		if (reg->nlportid != nlportid)
769 			continue;
770 
771 		list_del(&reg->list);
772 		kfree(reg);
773 
774 		wdev->mgmt_registrations_need_update = 1;
775 		schedule_work(&rdev->mgmt_registrations_update_wk);
776 	}
777 
778 	spin_unlock_bh(&rdev->mgmt_registrations_lock);
779 
780 	if (nlportid && rdev->crit_proto_nlportid == nlportid) {
781 		rdev->crit_proto_nlportid = 0;
782 		rdev_crit_proto_stop(rdev, wdev);
783 	}
784 
785 	if (nlportid == wdev->ap_unexpected_nlportid)
786 		wdev->ap_unexpected_nlportid = 0;
787 }
788 
cfg80211_mlme_purge_registrations(struct wireless_dev * wdev)789 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
790 {
791 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
792 	struct cfg80211_mgmt_registration *reg, *tmp;
793 
794 	spin_lock_bh(&rdev->mgmt_registrations_lock);
795 	list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
796 		list_del(&reg->list);
797 		kfree(reg);
798 	}
799 	wdev->mgmt_registrations_need_update = 1;
800 	spin_unlock_bh(&rdev->mgmt_registrations_lock);
801 
802 	cfg80211_mgmt_registrations_update(wdev);
803 }
804 
cfg80211_allowed_address(struct wireless_dev * wdev,const u8 * addr)805 static bool cfg80211_allowed_address(struct wireless_dev *wdev, const u8 *addr)
806 {
807 	int i;
808 
809 	for_each_valid_link(wdev, i) {
810 		if (ether_addr_equal(addr, wdev->links[i].addr))
811 			return true;
812 	}
813 
814 	return ether_addr_equal(addr, wdev_address(wdev));
815 }
816 
cfg80211_allowed_random_address(struct wireless_dev * wdev,const struct ieee80211_mgmt * mgmt)817 static bool cfg80211_allowed_random_address(struct wireless_dev *wdev,
818 					    const struct ieee80211_mgmt *mgmt)
819 {
820 	if (ieee80211_is_auth(mgmt->frame_control) ||
821 	    ieee80211_is_deauth(mgmt->frame_control)) {
822 		/* Allow random TA to be used with authentication and
823 		 * deauthentication frames if the driver has indicated support.
824 		 */
825 		if (wiphy_ext_feature_isset(
826 			    wdev->wiphy,
827 			    NL80211_EXT_FEATURE_AUTH_AND_DEAUTH_RANDOM_TA))
828 			return true;
829 	} else if (ieee80211_is_action(mgmt->frame_control) &&
830 		   mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
831 		/* Allow random TA to be used with Public Action frames if the
832 		 * driver has indicated support.
833 		 */
834 		if (!wdev->connected &&
835 		    wiphy_ext_feature_isset(
836 			    wdev->wiphy,
837 			    NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA))
838 			return true;
839 
840 		if (wdev->connected &&
841 		    wiphy_ext_feature_isset(
842 			    wdev->wiphy,
843 			    NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED))
844 			return true;
845 	}
846 
847 	return false;
848 }
849 
cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,struct cfg80211_mgmt_tx_params * params,u64 * cookie)850 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
851 			  struct wireless_dev *wdev,
852 			  struct cfg80211_mgmt_tx_params *params, u64 *cookie)
853 {
854 	const struct ieee80211_mgmt *mgmt;
855 	u16 stype;
856 
857 	lockdep_assert_wiphy(&rdev->wiphy);
858 
859 	if (!wdev->wiphy->mgmt_stypes)
860 		return -EOPNOTSUPP;
861 
862 	if (!rdev->ops->mgmt_tx)
863 		return -EOPNOTSUPP;
864 
865 	if (params->len < 24 + 1)
866 		return -EINVAL;
867 
868 	mgmt = (const struct ieee80211_mgmt *)params->buf;
869 
870 	if (!ieee80211_is_mgmt(mgmt->frame_control) ||
871 	    ieee80211_has_order(mgmt->frame_control))
872 		return -EINVAL;
873 
874 	stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
875 	if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
876 		return -EINVAL;
877 
878 	if (ieee80211_is_action(mgmt->frame_control) &&
879 	    mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
880 		int err = 0;
881 
882 		switch (wdev->iftype) {
883 		case NL80211_IFTYPE_ADHOC:
884 			/*
885 			 * check for IBSS DA must be done by driver as
886 			 * cfg80211 doesn't track the stations
887 			 */
888 			if (!wdev->u.ibss.current_bss ||
889 			    !ether_addr_equal(wdev->u.ibss.current_bss->pub.bssid,
890 					      mgmt->bssid)) {
891 				err = -ENOTCONN;
892 				break;
893 			}
894 			break;
895 		case NL80211_IFTYPE_STATION:
896 		case NL80211_IFTYPE_P2P_CLIENT:
897 			if (!wdev->connected) {
898 				err = -ENOTCONN;
899 				break;
900 			}
901 
902 			/* FIXME: MLD may address this differently */
903 
904 			if (!ether_addr_equal(wdev->u.client.connected_addr,
905 					      mgmt->bssid)) {
906 				err = -ENOTCONN;
907 				break;
908 			}
909 
910 			/* for station, check that DA is the AP */
911 			if (!ether_addr_equal(wdev->u.client.connected_addr,
912 					      mgmt->da)) {
913 				err = -ENOTCONN;
914 				break;
915 			}
916 			break;
917 		case NL80211_IFTYPE_AP:
918 		case NL80211_IFTYPE_P2P_GO:
919 		case NL80211_IFTYPE_AP_VLAN:
920 			if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)) &&
921 			    (params->link_id < 0 ||
922 			     !ether_addr_equal(mgmt->bssid,
923 					       wdev->links[params->link_id].addr)))
924 				err = -EINVAL;
925 			break;
926 		case NL80211_IFTYPE_MESH_POINT:
927 			if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
928 				err = -EINVAL;
929 				break;
930 			}
931 			/*
932 			 * check for mesh DA must be done by driver as
933 			 * cfg80211 doesn't track the stations
934 			 */
935 			break;
936 		case NL80211_IFTYPE_P2P_DEVICE:
937 			/*
938 			 * fall through, P2P device only supports
939 			 * public action frames
940 			 */
941 		case NL80211_IFTYPE_NAN:
942 		default:
943 			err = -EOPNOTSUPP;
944 			break;
945 		}
946 
947 		if (err)
948 			return err;
949 	}
950 
951 	if (!cfg80211_allowed_address(wdev, mgmt->sa) &&
952 	    !cfg80211_allowed_random_address(wdev, mgmt))
953 		return -EINVAL;
954 
955 	/* Transmit the management frame as requested by user space */
956 	return rdev_mgmt_tx(rdev, wdev, params, cookie);
957 }
958 
cfg80211_rx_mgmt_ext(struct wireless_dev * wdev,struct cfg80211_rx_info * info)959 bool cfg80211_rx_mgmt_ext(struct wireless_dev *wdev,
960 			  struct cfg80211_rx_info *info)
961 {
962 	struct wiphy *wiphy = wdev->wiphy;
963 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
964 	struct cfg80211_mgmt_registration *reg;
965 	const struct ieee80211_txrx_stypes *stypes =
966 		&wiphy->mgmt_stypes[wdev->iftype];
967 	struct ieee80211_mgmt *mgmt = (void *)info->buf;
968 	const u8 *data;
969 	int data_len;
970 	bool result = false;
971 	__le16 ftype = mgmt->frame_control &
972 		cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
973 	u16 stype;
974 
975 	trace_cfg80211_rx_mgmt(wdev, info);
976 	stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
977 
978 	if (!(stypes->rx & BIT(stype))) {
979 		trace_cfg80211_return_bool(false);
980 		return false;
981 	}
982 
983 	data = info->buf + ieee80211_hdrlen(mgmt->frame_control);
984 	data_len = info->len - ieee80211_hdrlen(mgmt->frame_control);
985 
986 	spin_lock_bh(&rdev->mgmt_registrations_lock);
987 
988 	list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
989 		if (reg->frame_type != ftype)
990 			continue;
991 
992 		if (reg->match_len > data_len)
993 			continue;
994 
995 		if (memcmp(reg->match, data, reg->match_len))
996 			continue;
997 
998 		/* found match! */
999 
1000 		/* Indicate the received Action frame to user space */
1001 		if (nl80211_send_mgmt(rdev, wdev, reg->nlportid, info,
1002 				      GFP_ATOMIC))
1003 			continue;
1004 
1005 		result = true;
1006 		break;
1007 	}
1008 
1009 	spin_unlock_bh(&rdev->mgmt_registrations_lock);
1010 
1011 	trace_cfg80211_return_bool(result);
1012 	return result;
1013 }
1014 EXPORT_SYMBOL(cfg80211_rx_mgmt_ext);
1015 
cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device * rdev)1016 void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev)
1017 {
1018 	cancel_delayed_work(&rdev->dfs_update_channels_wk);
1019 	queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0);
1020 }
1021 
cfg80211_dfs_channels_update_work(struct work_struct * work)1022 void cfg80211_dfs_channels_update_work(struct work_struct *work)
1023 {
1024 	struct delayed_work *delayed_work = to_delayed_work(work);
1025 	struct cfg80211_registered_device *rdev;
1026 	struct cfg80211_chan_def chandef;
1027 	struct ieee80211_supported_band *sband;
1028 	struct ieee80211_channel *c;
1029 	struct wiphy *wiphy;
1030 	bool check_again = false;
1031 	unsigned long timeout, next_time = 0;
1032 	unsigned long time_dfs_update;
1033 	enum nl80211_radar_event radar_event;
1034 	int bandid, i;
1035 
1036 	rdev = container_of(delayed_work, struct cfg80211_registered_device,
1037 			    dfs_update_channels_wk);
1038 	wiphy = &rdev->wiphy;
1039 
1040 	rtnl_lock();
1041 	for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
1042 		sband = wiphy->bands[bandid];
1043 		if (!sband)
1044 			continue;
1045 
1046 		for (i = 0; i < sband->n_channels; i++) {
1047 			c = &sband->channels[i];
1048 
1049 			if (!(c->flags & IEEE80211_CHAN_RADAR))
1050 				continue;
1051 
1052 			if (c->dfs_state != NL80211_DFS_UNAVAILABLE &&
1053 			    c->dfs_state != NL80211_DFS_AVAILABLE)
1054 				continue;
1055 
1056 			if (c->dfs_state == NL80211_DFS_UNAVAILABLE) {
1057 				time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS;
1058 				radar_event = NL80211_RADAR_NOP_FINISHED;
1059 			} else {
1060 				if (regulatory_pre_cac_allowed(wiphy) ||
1061 				    cfg80211_any_wiphy_oper_chan(wiphy, c))
1062 					continue;
1063 
1064 				time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS;
1065 				radar_event = NL80211_RADAR_PRE_CAC_EXPIRED;
1066 			}
1067 
1068 			timeout = c->dfs_state_entered +
1069 				  msecs_to_jiffies(time_dfs_update);
1070 
1071 			if (time_after_eq(jiffies, timeout)) {
1072 				c->dfs_state = NL80211_DFS_USABLE;
1073 				c->dfs_state_entered = jiffies;
1074 
1075 				cfg80211_chandef_create(&chandef, c,
1076 							NL80211_CHAN_NO_HT);
1077 
1078 				nl80211_radar_notify(rdev, &chandef,
1079 						     radar_event, NULL,
1080 						     GFP_ATOMIC);
1081 
1082 				regulatory_propagate_dfs_state(wiphy, &chandef,
1083 							       c->dfs_state,
1084 							       radar_event);
1085 				continue;
1086 			}
1087 
1088 			if (!check_again)
1089 				next_time = timeout - jiffies;
1090 			else
1091 				next_time = min(next_time, timeout - jiffies);
1092 			check_again = true;
1093 		}
1094 	}
1095 	rtnl_unlock();
1096 
1097 	/* reschedule if there are other channels waiting to be cleared again */
1098 	if (check_again)
1099 		queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
1100 				   next_time);
1101 }
1102 
1103 
__cfg80211_radar_event(struct wiphy * wiphy,struct cfg80211_chan_def * chandef,bool offchan,gfp_t gfp)1104 void __cfg80211_radar_event(struct wiphy *wiphy,
1105 			    struct cfg80211_chan_def *chandef,
1106 			    bool offchan, gfp_t gfp)
1107 {
1108 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1109 
1110 	trace_cfg80211_radar_event(wiphy, chandef, offchan);
1111 
1112 	/* only set the chandef supplied channel to unavailable, in
1113 	 * case the radar is detected on only one of multiple channels
1114 	 * spanned by the chandef.
1115 	 */
1116 	cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
1117 
1118 	if (offchan)
1119 		queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
1120 
1121 	cfg80211_sched_dfs_chan_update(rdev);
1122 
1123 	nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
1124 
1125 	memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def));
1126 	queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);
1127 }
1128 EXPORT_SYMBOL(__cfg80211_radar_event);
1129 
cfg80211_cac_event(struct net_device * netdev,const struct cfg80211_chan_def * chandef,enum nl80211_radar_event event,gfp_t gfp,unsigned int link_id)1130 void cfg80211_cac_event(struct net_device *netdev,
1131 			const struct cfg80211_chan_def *chandef,
1132 			enum nl80211_radar_event event, gfp_t gfp,
1133 			unsigned int link_id)
1134 {
1135 	struct wireless_dev *wdev = netdev->ieee80211_ptr;
1136 	struct wiphy *wiphy = wdev->wiphy;
1137 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1138 	unsigned long timeout;
1139 
1140 	if (WARN_ON(wdev->valid_links &&
1141 		    !(wdev->valid_links & BIT(link_id))))
1142 		return;
1143 
1144 	trace_cfg80211_cac_event(netdev, event, link_id);
1145 
1146 	if (WARN_ON(!wdev->links[link_id].cac_started &&
1147 		    event != NL80211_RADAR_CAC_STARTED))
1148 		return;
1149 
1150 	switch (event) {
1151 	case NL80211_RADAR_CAC_FINISHED:
1152 		timeout = wdev->links[link_id].cac_start_time +
1153 			  msecs_to_jiffies(wdev->links[link_id].cac_time_ms);
1154 		WARN_ON(!time_after_eq(jiffies, timeout));
1155 		cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
1156 		memcpy(&rdev->cac_done_chandef, chandef,
1157 		       sizeof(struct cfg80211_chan_def));
1158 		queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
1159 		cfg80211_sched_dfs_chan_update(rdev);
1160 		fallthrough;
1161 	case NL80211_RADAR_CAC_ABORTED:
1162 		wdev->links[link_id].cac_started = false;
1163 		break;
1164 	case NL80211_RADAR_CAC_STARTED:
1165 		wdev->links[link_id].cac_started = true;
1166 		break;
1167 	default:
1168 		WARN_ON(1);
1169 		return;
1170 	}
1171 
1172 	nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
1173 }
1174 EXPORT_SYMBOL(cfg80211_cac_event);
1175 
1176 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)1177 __cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
1178 				struct wireless_dev *wdev,
1179 				const struct cfg80211_chan_def *chandef,
1180 				enum nl80211_radar_event event)
1181 {
1182 	struct wiphy *wiphy = &rdev->wiphy;
1183 	struct net_device *netdev;
1184 
1185 	lockdep_assert_wiphy(&rdev->wiphy);
1186 
1187 	if (!cfg80211_chandef_valid(chandef))
1188 		return;
1189 
1190 	if (!rdev->background_radar_wdev)
1191 		return;
1192 
1193 	switch (event) {
1194 	case NL80211_RADAR_CAC_FINISHED:
1195 		cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
1196 		memcpy(&rdev->cac_done_chandef, chandef, sizeof(*chandef));
1197 		queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
1198 		cfg80211_sched_dfs_chan_update(rdev);
1199 		wdev = rdev->background_radar_wdev;
1200 		break;
1201 	case NL80211_RADAR_CAC_ABORTED:
1202 		if (!cancel_delayed_work(&rdev->background_cac_done_wk))
1203 			return;
1204 		wdev = rdev->background_radar_wdev;
1205 		break;
1206 	case NL80211_RADAR_CAC_STARTED:
1207 		break;
1208 	default:
1209 		return;
1210 	}
1211 
1212 	netdev = wdev ? wdev->netdev : NULL;
1213 	nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL);
1214 }
1215 
1216 static void
cfg80211_background_cac_event(struct cfg80211_registered_device * rdev,const struct cfg80211_chan_def * chandef,enum nl80211_radar_event event)1217 cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
1218 			      const struct cfg80211_chan_def *chandef,
1219 			      enum nl80211_radar_event event)
1220 {
1221 	guard(wiphy)(&rdev->wiphy);
1222 
1223 	__cfg80211_background_cac_event(rdev, rdev->background_radar_wdev,
1224 					chandef, event);
1225 }
1226 
cfg80211_background_cac_done_wk(struct work_struct * work)1227 void cfg80211_background_cac_done_wk(struct work_struct *work)
1228 {
1229 	struct delayed_work *delayed_work = to_delayed_work(work);
1230 	struct cfg80211_registered_device *rdev;
1231 
1232 	rdev = container_of(delayed_work, struct cfg80211_registered_device,
1233 			    background_cac_done_wk);
1234 	cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
1235 				      NL80211_RADAR_CAC_FINISHED);
1236 }
1237 
cfg80211_background_cac_abort_wk(struct work_struct * work)1238 void cfg80211_background_cac_abort_wk(struct work_struct *work)
1239 {
1240 	struct cfg80211_registered_device *rdev;
1241 
1242 	rdev = container_of(work, struct cfg80211_registered_device,
1243 			    background_cac_abort_wk);
1244 	cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
1245 				      NL80211_RADAR_CAC_ABORTED);
1246 }
1247 
cfg80211_background_cac_abort(struct wiphy * wiphy)1248 void cfg80211_background_cac_abort(struct wiphy *wiphy)
1249 {
1250 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1251 
1252 	queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
1253 }
1254 EXPORT_SYMBOL(cfg80211_background_cac_abort);
1255 
1256 int
cfg80211_start_background_radar_detection(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,struct cfg80211_chan_def * chandef)1257 cfg80211_start_background_radar_detection(struct cfg80211_registered_device *rdev,
1258 					  struct wireless_dev *wdev,
1259 					  struct cfg80211_chan_def *chandef)
1260 {
1261 	unsigned int cac_time_ms;
1262 	int err;
1263 
1264 	lockdep_assert_wiphy(&rdev->wiphy);
1265 
1266 	if (!wiphy_ext_feature_isset(&rdev->wiphy,
1267 				     NL80211_EXT_FEATURE_RADAR_BACKGROUND))
1268 		return -EOPNOTSUPP;
1269 
1270 	/* Offchannel chain already locked by another wdev */
1271 	if (rdev->background_radar_wdev && rdev->background_radar_wdev != wdev)
1272 		return -EBUSY;
1273 
1274 	/* CAC already in progress on the offchannel chain */
1275 	if (rdev->background_radar_wdev == wdev &&
1276 	    delayed_work_pending(&rdev->background_cac_done_wk))
1277 		return -EBUSY;
1278 
1279 	err = rdev_set_radar_background(rdev, chandef);
1280 	if (err)
1281 		return err;
1282 
1283 	cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, chandef);
1284 	if (!cac_time_ms)
1285 		cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1286 
1287 	rdev->background_radar_chandef = *chandef;
1288 	rdev->background_radar_wdev = wdev; /* Get offchain ownership */
1289 
1290 	__cfg80211_background_cac_event(rdev, wdev, chandef,
1291 					NL80211_RADAR_CAC_STARTED);
1292 	queue_delayed_work(cfg80211_wq, &rdev->background_cac_done_wk,
1293 			   msecs_to_jiffies(cac_time_ms));
1294 
1295 	return 0;
1296 }
1297 
cfg80211_stop_background_radar_detection(struct wireless_dev * wdev)1298 void cfg80211_stop_background_radar_detection(struct wireless_dev *wdev)
1299 {
1300 	struct wiphy *wiphy = wdev->wiphy;
1301 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1302 
1303 	lockdep_assert_wiphy(wiphy);
1304 
1305 	if (wdev != rdev->background_radar_wdev)
1306 		return;
1307 
1308 	rdev_set_radar_background(rdev, NULL);
1309 	rdev->background_radar_wdev = NULL; /* Release offchain ownership */
1310 
1311 	__cfg80211_background_cac_event(rdev, wdev,
1312 					&rdev->background_radar_chandef,
1313 					NL80211_RADAR_CAC_ABORTED);
1314 }
1315 
cfg80211_assoc_ml_reconf(struct cfg80211_registered_device * rdev,struct net_device * dev,struct cfg80211_ml_reconf_req * req)1316 int cfg80211_assoc_ml_reconf(struct cfg80211_registered_device *rdev,
1317 			     struct net_device *dev,
1318 			     struct cfg80211_ml_reconf_req *req)
1319 {
1320 	struct wireless_dev *wdev = dev->ieee80211_ptr;
1321 	int err;
1322 
1323 	lockdep_assert_wiphy(wdev->wiphy);
1324 
1325 	err = rdev_assoc_ml_reconf(rdev, dev, req);
1326 	if (!err) {
1327 		int link_id;
1328 
1329 		for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS;
1330 		     link_id++) {
1331 			if (!req->add_links[link_id].bss)
1332 				continue;
1333 
1334 			cfg80211_ref_bss(&rdev->wiphy, req->add_links[link_id].bss);
1335 			cfg80211_hold_bss(bss_from_pub(req->add_links[link_id].bss));
1336 		}
1337 	}
1338 
1339 	return err;
1340 }
1341 
cfg80211_mlo_reconf_add_done(struct net_device * dev,struct cfg80211_mlo_reconf_done_data * data)1342 void cfg80211_mlo_reconf_add_done(struct net_device *dev,
1343 				  struct cfg80211_mlo_reconf_done_data *data)
1344 {
1345 	struct wireless_dev *wdev = dev->ieee80211_ptr;
1346 	struct wiphy *wiphy = wdev->wiphy;
1347 	int link_id;
1348 
1349 	lockdep_assert_wiphy(wiphy);
1350 
1351 	trace_cfg80211_mlo_reconf_add_done(dev, data->added_links,
1352 					   data->buf, data->len,
1353 					   data->driver_initiated);
1354 
1355 	if (WARN_ON(!wdev->valid_links))
1356 		return;
1357 
1358 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
1359 		    wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
1360 		return;
1361 
1362 	/* validate that a BSS is given for each added link */
1363 	for (link_id = 0; link_id < ARRAY_SIZE(data->links); link_id++) {
1364 		struct cfg80211_bss *bss = data->links[link_id].bss;
1365 
1366 		if (!(data->added_links & BIT(link_id)))
1367 			continue;
1368 
1369 		if (WARN_ON(!bss))
1370 			return;
1371 	}
1372 
1373 	for (link_id = 0; link_id < ARRAY_SIZE(data->links); link_id++) {
1374 		struct cfg80211_bss *bss = data->links[link_id].bss;
1375 
1376 		if (!bss)
1377 			continue;
1378 
1379 		if (data->added_links & BIT(link_id)) {
1380 			wdev->links[link_id].client.current_bss =
1381 				bss_from_pub(bss);
1382 
1383 			if (data->driver_initiated)
1384 				cfg80211_hold_bss(bss_from_pub(bss));
1385 
1386 			memcpy(wdev->links[link_id].addr,
1387 			       data->links[link_id].addr,
1388 			       ETH_ALEN);
1389 		} else {
1390 			if (!data->driver_initiated)
1391 				cfg80211_unhold_bss(bss_from_pub(bss));
1392 
1393 			cfg80211_put_bss(wiphy, bss);
1394 		}
1395 	}
1396 
1397 	wdev->valid_links |= data->added_links;
1398 	nl80211_mlo_reconf_add_done(dev, data);
1399 }
1400 EXPORT_SYMBOL(cfg80211_mlo_reconf_add_done);
1401