xref: /openbmc/linux/net/wireless/sme.c (revision cacdc118)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * SME code for cfg80211
4  * both driver SME event handling and the SME implementation
5  * (for nl80211's connect() and wext)
6  *
7  * Copyright 2009	Johannes Berg <johannes@sipsolutions.net>
8  * Copyright (C) 2009, 2020, 2022-2023 Intel Corporation. All rights reserved.
9  * Copyright 2017	Intel Deutschland GmbH
10  */
11 
12 #include <linux/etherdevice.h>
13 #include <linux/if_arp.h>
14 #include <linux/slab.h>
15 #include <linux/workqueue.h>
16 #include <linux/wireless.h>
17 #include <linux/export.h>
18 #include <net/iw_handler.h>
19 #include <net/cfg80211.h>
20 #include <net/rtnetlink.h>
21 #include "nl80211.h"
22 #include "reg.h"
23 #include "rdev-ops.h"
24 
25 /*
26  * Software SME in cfg80211, using auth/assoc/deauth calls to the
27  * driver. This is for implementing nl80211's connect/disconnect
28  * and wireless extensions (if configured.)
29  */
30 
31 struct cfg80211_conn {
32 	struct cfg80211_connect_params params;
33 	/* these are sub-states of the _CONNECTING sme_state */
34 	enum {
35 		CFG80211_CONN_SCANNING,
36 		CFG80211_CONN_SCAN_AGAIN,
37 		CFG80211_CONN_AUTHENTICATE_NEXT,
38 		CFG80211_CONN_AUTHENTICATING,
39 		CFG80211_CONN_AUTH_FAILED_TIMEOUT,
40 		CFG80211_CONN_ASSOCIATE_NEXT,
41 		CFG80211_CONN_ASSOCIATING,
42 		CFG80211_CONN_ASSOC_FAILED,
43 		CFG80211_CONN_ASSOC_FAILED_TIMEOUT,
44 		CFG80211_CONN_DEAUTH,
45 		CFG80211_CONN_ABANDON,
46 		CFG80211_CONN_CONNECTED,
47 	} state;
48 	u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
49 	const u8 *ie;
50 	size_t ie_len;
51 	bool auto_auth, prev_bssid_valid;
52 };
53 
cfg80211_sme_free(struct wireless_dev * wdev)54 static void cfg80211_sme_free(struct wireless_dev *wdev)
55 {
56 	if (!wdev->conn)
57 		return;
58 
59 	kfree(wdev->conn->ie);
60 	kfree(wdev->conn);
61 	wdev->conn = NULL;
62 }
63 
cfg80211_conn_scan(struct wireless_dev * wdev)64 static int cfg80211_conn_scan(struct wireless_dev *wdev)
65 {
66 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
67 	struct cfg80211_scan_request *request;
68 	int n_channels, err;
69 
70 	ASSERT_WDEV_LOCK(wdev);
71 
72 	if (rdev->scan_req || rdev->scan_msg)
73 		return -EBUSY;
74 
75 	if (wdev->conn->params.channel)
76 		n_channels = 1;
77 	else
78 		n_channels = ieee80211_get_num_supported_channels(wdev->wiphy);
79 
80 	request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
81 			  sizeof(request->channels[0]) * n_channels,
82 			  GFP_KERNEL);
83 	if (!request)
84 		return -ENOMEM;
85 
86 	if (wdev->conn->params.channel) {
87 		enum nl80211_band band = wdev->conn->params.channel->band;
88 		struct ieee80211_supported_band *sband =
89 			wdev->wiphy->bands[band];
90 
91 		if (!sband) {
92 			kfree(request);
93 			return -EINVAL;
94 		}
95 		request->channels[0] = wdev->conn->params.channel;
96 		request->rates[band] = (1 << sband->n_bitrates) - 1;
97 	} else {
98 		int i = 0, j;
99 		enum nl80211_band band;
100 		struct ieee80211_supported_band *bands;
101 		struct ieee80211_channel *channel;
102 
103 		for (band = 0; band < NUM_NL80211_BANDS; band++) {
104 			bands = wdev->wiphy->bands[band];
105 			if (!bands)
106 				continue;
107 			for (j = 0; j < bands->n_channels; j++) {
108 				channel = &bands->channels[j];
109 				if (channel->flags & IEEE80211_CHAN_DISABLED)
110 					continue;
111 				request->channels[i++] = channel;
112 			}
113 			request->rates[band] = (1 << bands->n_bitrates) - 1;
114 		}
115 		n_channels = i;
116 	}
117 	request->n_channels = n_channels;
118 	request->ssids = (void *)request +
119 		struct_size(request, channels, n_channels);
120 	request->n_ssids = 1;
121 
122 	memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
123 		wdev->conn->params.ssid_len);
124 	request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
125 
126 	eth_broadcast_addr(request->bssid);
127 
128 	request->wdev = wdev;
129 	request->wiphy = &rdev->wiphy;
130 	request->scan_start = jiffies;
131 
132 	rdev->scan_req = request;
133 
134 	err = rdev_scan(rdev, request);
135 	if (!err) {
136 		wdev->conn->state = CFG80211_CONN_SCANNING;
137 		nl80211_send_scan_start(rdev, wdev);
138 		dev_hold(wdev->netdev);
139 	} else {
140 		rdev->scan_req = NULL;
141 		kfree(request);
142 	}
143 	return err;
144 }
145 
cfg80211_conn_do_work(struct wireless_dev * wdev,enum nl80211_timeout_reason * treason)146 static int cfg80211_conn_do_work(struct wireless_dev *wdev,
147 				 enum nl80211_timeout_reason *treason)
148 {
149 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
150 	struct cfg80211_connect_params *params;
151 	struct cfg80211_auth_request auth_req = {};
152 	struct cfg80211_assoc_request req = {};
153 	int err;
154 
155 	ASSERT_WDEV_LOCK(wdev);
156 
157 	if (!wdev->conn)
158 		return 0;
159 
160 	params = &wdev->conn->params;
161 
162 	switch (wdev->conn->state) {
163 	case CFG80211_CONN_SCANNING:
164 		/* didn't find it during scan ... */
165 		return -ENOENT;
166 	case CFG80211_CONN_SCAN_AGAIN:
167 		return cfg80211_conn_scan(wdev);
168 	case CFG80211_CONN_AUTHENTICATE_NEXT:
169 		if (WARN_ON(!rdev->ops->auth))
170 			return -EOPNOTSUPP;
171 		wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
172 		auth_req.key = params->key;
173 		auth_req.key_len = params->key_len;
174 		auth_req.key_idx = params->key_idx;
175 		auth_req.auth_type = params->auth_type;
176 		auth_req.bss = cfg80211_get_bss(&rdev->wiphy, params->channel,
177 						params->bssid,
178 						params->ssid, params->ssid_len,
179 						IEEE80211_BSS_TYPE_ESS,
180 						IEEE80211_PRIVACY_ANY);
181 		auth_req.link_id = -1;
182 		err = cfg80211_mlme_auth(rdev, wdev->netdev, &auth_req);
183 		cfg80211_put_bss(&rdev->wiphy, auth_req.bss);
184 		return err;
185 	case CFG80211_CONN_AUTH_FAILED_TIMEOUT:
186 		*treason = NL80211_TIMEOUT_AUTH;
187 		return -ENOTCONN;
188 	case CFG80211_CONN_ASSOCIATE_NEXT:
189 		if (WARN_ON(!rdev->ops->assoc))
190 			return -EOPNOTSUPP;
191 		wdev->conn->state = CFG80211_CONN_ASSOCIATING;
192 		if (wdev->conn->prev_bssid_valid)
193 			req.prev_bssid = wdev->conn->prev_bssid;
194 		req.ie = params->ie;
195 		req.ie_len = params->ie_len;
196 		req.use_mfp = params->mfp != NL80211_MFP_NO;
197 		req.crypto = params->crypto;
198 		req.flags = params->flags;
199 		req.ht_capa = params->ht_capa;
200 		req.ht_capa_mask = params->ht_capa_mask;
201 		req.vht_capa = params->vht_capa;
202 		req.vht_capa_mask = params->vht_capa_mask;
203 		req.link_id = -1;
204 
205 		req.bss = cfg80211_get_bss(&rdev->wiphy, params->channel,
206 					   params->bssid,
207 					   params->ssid, params->ssid_len,
208 					   IEEE80211_BSS_TYPE_ESS,
209 					   IEEE80211_PRIVACY_ANY);
210 		if (!req.bss) {
211 			err = -ENOENT;
212 		} else {
213 			err = cfg80211_mlme_assoc(rdev, wdev->netdev, &req);
214 			cfg80211_put_bss(&rdev->wiphy, req.bss);
215 		}
216 
217 		if (err)
218 			cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
219 					     NULL, 0,
220 					     WLAN_REASON_DEAUTH_LEAVING,
221 					     false);
222 		return err;
223 	case CFG80211_CONN_ASSOC_FAILED_TIMEOUT:
224 		*treason = NL80211_TIMEOUT_ASSOC;
225 		fallthrough;
226 	case CFG80211_CONN_ASSOC_FAILED:
227 		cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
228 				     NULL, 0,
229 				     WLAN_REASON_DEAUTH_LEAVING, false);
230 		return -ENOTCONN;
231 	case CFG80211_CONN_DEAUTH:
232 		cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
233 				     NULL, 0,
234 				     WLAN_REASON_DEAUTH_LEAVING, false);
235 		fallthrough;
236 	case CFG80211_CONN_ABANDON:
237 		/* free directly, disconnected event already sent */
238 		cfg80211_sme_free(wdev);
239 		return 0;
240 	default:
241 		return 0;
242 	}
243 }
244 
cfg80211_conn_work(struct work_struct * work)245 void cfg80211_conn_work(struct work_struct *work)
246 {
247 	struct cfg80211_registered_device *rdev =
248 		container_of(work, struct cfg80211_registered_device, conn_work);
249 	struct wireless_dev *wdev;
250 	u8 bssid_buf[ETH_ALEN], *bssid = NULL;
251 	enum nl80211_timeout_reason treason;
252 
253 	wiphy_lock(&rdev->wiphy);
254 
255 	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
256 		if (!wdev->netdev)
257 			continue;
258 
259 		wdev_lock(wdev);
260 		if (!netif_running(wdev->netdev)) {
261 			wdev_unlock(wdev);
262 			continue;
263 		}
264 		if (!wdev->conn ||
265 		    wdev->conn->state == CFG80211_CONN_CONNECTED) {
266 			wdev_unlock(wdev);
267 			continue;
268 		}
269 		if (wdev->conn->params.bssid) {
270 			memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
271 			bssid = bssid_buf;
272 		}
273 		treason = NL80211_TIMEOUT_UNSPECIFIED;
274 		if (cfg80211_conn_do_work(wdev, &treason)) {
275 			struct cfg80211_connect_resp_params cr;
276 
277 			memset(&cr, 0, sizeof(cr));
278 			cr.status = -1;
279 			cr.links[0].bssid = bssid;
280 			cr.timeout_reason = treason;
281 			__cfg80211_connect_result(wdev->netdev, &cr, false);
282 		}
283 		wdev_unlock(wdev);
284 	}
285 
286 	wiphy_unlock(&rdev->wiphy);
287 }
288 
cfg80211_step_auth_next(struct cfg80211_conn * conn,struct cfg80211_bss * bss)289 static void cfg80211_step_auth_next(struct cfg80211_conn *conn,
290 				    struct cfg80211_bss *bss)
291 {
292 	memcpy(conn->bssid, bss->bssid, ETH_ALEN);
293 	conn->params.bssid = conn->bssid;
294 	conn->params.channel = bss->channel;
295 	conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
296 }
297 
298 /* Returned bss is reference counted and must be cleaned up appropriately. */
cfg80211_get_conn_bss(struct wireless_dev * wdev)299 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
300 {
301 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
302 	struct cfg80211_bss *bss;
303 
304 	ASSERT_WDEV_LOCK(wdev);
305 
306 	bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
307 			       wdev->conn->params.bssid,
308 			       wdev->conn->params.ssid,
309 			       wdev->conn->params.ssid_len,
310 			       wdev->conn_bss_type,
311 			       IEEE80211_PRIVACY(wdev->conn->params.privacy));
312 	if (!bss)
313 		return NULL;
314 
315 	cfg80211_step_auth_next(wdev->conn, bss);
316 	schedule_work(&rdev->conn_work);
317 
318 	return bss;
319 }
320 
__cfg80211_sme_scan_done(struct net_device * dev)321 static void __cfg80211_sme_scan_done(struct net_device *dev)
322 {
323 	struct wireless_dev *wdev = dev->ieee80211_ptr;
324 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
325 	struct cfg80211_bss *bss;
326 
327 	ASSERT_WDEV_LOCK(wdev);
328 
329 	if (!wdev->conn)
330 		return;
331 
332 	if (wdev->conn->state != CFG80211_CONN_SCANNING &&
333 	    wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
334 		return;
335 
336 	bss = cfg80211_get_conn_bss(wdev);
337 	if (bss)
338 		cfg80211_put_bss(&rdev->wiphy, bss);
339 	else
340 		schedule_work(&rdev->conn_work);
341 }
342 
cfg80211_sme_scan_done(struct net_device * dev)343 void cfg80211_sme_scan_done(struct net_device *dev)
344 {
345 	struct wireless_dev *wdev = dev->ieee80211_ptr;
346 
347 	wdev_lock(wdev);
348 	__cfg80211_sme_scan_done(dev);
349 	wdev_unlock(wdev);
350 }
351 
cfg80211_sme_rx_auth(struct wireless_dev * wdev,const u8 * buf,size_t len)352 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len)
353 {
354 	struct wiphy *wiphy = wdev->wiphy;
355 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
356 	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
357 	u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
358 
359 	ASSERT_WDEV_LOCK(wdev);
360 
361 	if (!wdev->conn || wdev->conn->state == CFG80211_CONN_CONNECTED)
362 		return;
363 
364 	if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
365 	    wdev->conn->auto_auth &&
366 	    wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
367 		/* select automatically between only open, shared, leap */
368 		switch (wdev->conn->params.auth_type) {
369 		case NL80211_AUTHTYPE_OPEN_SYSTEM:
370 			if (wdev->connect_keys)
371 				wdev->conn->params.auth_type =
372 					NL80211_AUTHTYPE_SHARED_KEY;
373 			else
374 				wdev->conn->params.auth_type =
375 					NL80211_AUTHTYPE_NETWORK_EAP;
376 			break;
377 		case NL80211_AUTHTYPE_SHARED_KEY:
378 			wdev->conn->params.auth_type =
379 				NL80211_AUTHTYPE_NETWORK_EAP;
380 			break;
381 		default:
382 			/* huh? */
383 			wdev->conn->params.auth_type =
384 				NL80211_AUTHTYPE_OPEN_SYSTEM;
385 			break;
386 		}
387 		wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
388 		schedule_work(&rdev->conn_work);
389 	} else if (status_code != WLAN_STATUS_SUCCESS) {
390 		struct cfg80211_connect_resp_params cr;
391 
392 		memset(&cr, 0, sizeof(cr));
393 		cr.status = status_code;
394 		cr.links[0].bssid = mgmt->bssid;
395 		cr.timeout_reason = NL80211_TIMEOUT_UNSPECIFIED;
396 		__cfg80211_connect_result(wdev->netdev, &cr, false);
397 	} else if (wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
398 		wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
399 		schedule_work(&rdev->conn_work);
400 	}
401 }
402 
cfg80211_sme_rx_assoc_resp(struct wireless_dev * wdev,u16 status)403 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status)
404 {
405 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
406 
407 	if (!wdev->conn)
408 		return false;
409 
410 	if (status == WLAN_STATUS_SUCCESS) {
411 		wdev->conn->state = CFG80211_CONN_CONNECTED;
412 		return false;
413 	}
414 
415 	if (wdev->conn->prev_bssid_valid) {
416 		/*
417 		 * Some stupid APs don't accept reassoc, so we
418 		 * need to fall back to trying regular assoc;
419 		 * return true so no event is sent to userspace.
420 		 */
421 		wdev->conn->prev_bssid_valid = false;
422 		wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
423 		schedule_work(&rdev->conn_work);
424 		return true;
425 	}
426 
427 	wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
428 	schedule_work(&rdev->conn_work);
429 	return false;
430 }
431 
cfg80211_sme_deauth(struct wireless_dev * wdev)432 void cfg80211_sme_deauth(struct wireless_dev *wdev)
433 {
434 	cfg80211_sme_free(wdev);
435 }
436 
cfg80211_sme_auth_timeout(struct wireless_dev * wdev)437 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev)
438 {
439 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
440 
441 	if (!wdev->conn)
442 		return;
443 
444 	wdev->conn->state = CFG80211_CONN_AUTH_FAILED_TIMEOUT;
445 	schedule_work(&rdev->conn_work);
446 }
447 
cfg80211_sme_disassoc(struct wireless_dev * wdev)448 void cfg80211_sme_disassoc(struct wireless_dev *wdev)
449 {
450 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
451 
452 	if (!wdev->conn)
453 		return;
454 
455 	wdev->conn->state = CFG80211_CONN_DEAUTH;
456 	schedule_work(&rdev->conn_work);
457 }
458 
cfg80211_sme_assoc_timeout(struct wireless_dev * wdev)459 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev)
460 {
461 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
462 
463 	if (!wdev->conn)
464 		return;
465 
466 	wdev->conn->state = CFG80211_CONN_ASSOC_FAILED_TIMEOUT;
467 	schedule_work(&rdev->conn_work);
468 }
469 
cfg80211_sme_abandon_assoc(struct wireless_dev * wdev)470 void cfg80211_sme_abandon_assoc(struct wireless_dev *wdev)
471 {
472 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
473 
474 	if (!wdev->conn)
475 		return;
476 
477 	wdev->conn->state = CFG80211_CONN_ABANDON;
478 	schedule_work(&rdev->conn_work);
479 }
480 
cfg80211_wdev_release_bsses(struct wireless_dev * wdev)481 static void cfg80211_wdev_release_bsses(struct wireless_dev *wdev)
482 {
483 	unsigned int link;
484 
485 	for_each_valid_link(wdev, link) {
486 		if (!wdev->links[link].client.current_bss)
487 			continue;
488 		cfg80211_unhold_bss(wdev->links[link].client.current_bss);
489 		cfg80211_put_bss(wdev->wiphy,
490 				 &wdev->links[link].client.current_bss->pub);
491 		wdev->links[link].client.current_bss = NULL;
492 	}
493 }
494 
cfg80211_wdev_release_link_bsses(struct wireless_dev * wdev,u16 link_mask)495 void cfg80211_wdev_release_link_bsses(struct wireless_dev *wdev, u16 link_mask)
496 {
497 	unsigned int link;
498 
499 	for_each_valid_link(wdev, link) {
500 		if (!wdev->links[link].client.current_bss ||
501 		    !(link_mask & BIT(link)))
502 			continue;
503 		cfg80211_unhold_bss(wdev->links[link].client.current_bss);
504 		cfg80211_put_bss(wdev->wiphy,
505 				 &wdev->links[link].client.current_bss->pub);
506 		wdev->links[link].client.current_bss = NULL;
507 	}
508 }
509 
cfg80211_sme_get_conn_ies(struct wireless_dev * wdev,const u8 * ies,size_t ies_len,const u8 ** out_ies,size_t * out_ies_len)510 static int cfg80211_sme_get_conn_ies(struct wireless_dev *wdev,
511 				     const u8 *ies, size_t ies_len,
512 				     const u8 **out_ies, size_t *out_ies_len)
513 {
514 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
515 	u8 *buf;
516 	size_t offs;
517 
518 	if (!rdev->wiphy.extended_capabilities_len ||
519 	    (ies && cfg80211_find_ie(WLAN_EID_EXT_CAPABILITY, ies, ies_len))) {
520 		*out_ies = kmemdup(ies, ies_len, GFP_KERNEL);
521 		if (!*out_ies)
522 			return -ENOMEM;
523 		*out_ies_len = ies_len;
524 		return 0;
525 	}
526 
527 	buf = kmalloc(ies_len + rdev->wiphy.extended_capabilities_len + 2,
528 		      GFP_KERNEL);
529 	if (!buf)
530 		return -ENOMEM;
531 
532 	if (ies_len) {
533 		static const u8 before_extcapa[] = {
534 			/* not listing IEs expected to be created by driver */
535 			WLAN_EID_RSN,
536 			WLAN_EID_QOS_CAPA,
537 			WLAN_EID_RRM_ENABLED_CAPABILITIES,
538 			WLAN_EID_MOBILITY_DOMAIN,
539 			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
540 			WLAN_EID_BSS_COEX_2040,
541 		};
542 
543 		offs = ieee80211_ie_split(ies, ies_len, before_extcapa,
544 					  ARRAY_SIZE(before_extcapa), 0);
545 		memcpy(buf, ies, offs);
546 		/* leave a whole for extended capabilities IE */
547 		memcpy(buf + offs + rdev->wiphy.extended_capabilities_len + 2,
548 		       ies + offs, ies_len - offs);
549 	} else {
550 		offs = 0;
551 	}
552 
553 	/* place extended capabilities IE (with only driver capabilities) */
554 	buf[offs] = WLAN_EID_EXT_CAPABILITY;
555 	buf[offs + 1] = rdev->wiphy.extended_capabilities_len;
556 	memcpy(buf + offs + 2,
557 	       rdev->wiphy.extended_capabilities,
558 	       rdev->wiphy.extended_capabilities_len);
559 
560 	*out_ies = buf;
561 	*out_ies_len = ies_len + rdev->wiphy.extended_capabilities_len + 2;
562 
563 	return 0;
564 }
565 
cfg80211_sme_connect(struct wireless_dev * wdev,struct cfg80211_connect_params * connect,const u8 * prev_bssid)566 static int cfg80211_sme_connect(struct wireless_dev *wdev,
567 				struct cfg80211_connect_params *connect,
568 				const u8 *prev_bssid)
569 {
570 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
571 	struct cfg80211_bss *bss;
572 	int err;
573 
574 	if (!rdev->ops->auth || !rdev->ops->assoc)
575 		return -EOPNOTSUPP;
576 
577 	cfg80211_wdev_release_bsses(wdev);
578 
579 	if (wdev->connected) {
580 		cfg80211_sme_free(wdev);
581 		wdev->connected = false;
582 	}
583 
584 	if (wdev->conn)
585 		return -EINPROGRESS;
586 
587 	wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
588 	if (!wdev->conn)
589 		return -ENOMEM;
590 
591 	/*
592 	 * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
593 	 */
594 	memcpy(&wdev->conn->params, connect, sizeof(*connect));
595 	if (connect->bssid) {
596 		wdev->conn->params.bssid = wdev->conn->bssid;
597 		memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
598 	}
599 
600 	if (cfg80211_sme_get_conn_ies(wdev, connect->ie, connect->ie_len,
601 				      &wdev->conn->ie,
602 				      &wdev->conn->params.ie_len)) {
603 		kfree(wdev->conn);
604 		wdev->conn = NULL;
605 		return -ENOMEM;
606 	}
607 	wdev->conn->params.ie = wdev->conn->ie;
608 
609 	if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
610 		wdev->conn->auto_auth = true;
611 		/* start with open system ... should mostly work */
612 		wdev->conn->params.auth_type =
613 			NL80211_AUTHTYPE_OPEN_SYSTEM;
614 	} else {
615 		wdev->conn->auto_auth = false;
616 	}
617 
618 	wdev->conn->params.ssid = wdev->u.client.ssid;
619 	wdev->conn->params.ssid_len = wdev->u.client.ssid_len;
620 
621 	/* see if we have the bss already */
622 	bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
623 			       wdev->conn->params.bssid,
624 			       wdev->conn->params.ssid,
625 			       wdev->conn->params.ssid_len,
626 			       wdev->conn_bss_type,
627 			       IEEE80211_PRIVACY(wdev->conn->params.privacy));
628 
629 	if (prev_bssid) {
630 		memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
631 		wdev->conn->prev_bssid_valid = true;
632 	}
633 
634 	/* we're good if we have a matching bss struct */
635 	if (bss) {
636 		enum nl80211_timeout_reason treason;
637 
638 		cfg80211_step_auth_next(wdev->conn, bss);
639 		err = cfg80211_conn_do_work(wdev, &treason);
640 		cfg80211_put_bss(wdev->wiphy, bss);
641 	} else {
642 		/* otherwise we'll need to scan for the AP first */
643 		err = cfg80211_conn_scan(wdev);
644 
645 		/*
646 		 * If we can't scan right now, then we need to scan again
647 		 * after the current scan finished, since the parameters
648 		 * changed (unless we find a good AP anyway).
649 		 */
650 		if (err == -EBUSY) {
651 			err = 0;
652 			wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
653 		}
654 	}
655 
656 	if (err)
657 		cfg80211_sme_free(wdev);
658 
659 	return err;
660 }
661 
cfg80211_sme_disconnect(struct wireless_dev * wdev,u16 reason)662 static int cfg80211_sme_disconnect(struct wireless_dev *wdev, u16 reason)
663 {
664 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
665 	int err;
666 
667 	if (!wdev->conn)
668 		return 0;
669 
670 	if (!rdev->ops->deauth)
671 		return -EOPNOTSUPP;
672 
673 	if (wdev->conn->state == CFG80211_CONN_SCANNING ||
674 	    wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) {
675 		err = 0;
676 		goto out;
677 	}
678 
679 	/* wdev->conn->params.bssid must be set if > SCANNING */
680 	err = cfg80211_mlme_deauth(rdev, wdev->netdev,
681 				   wdev->conn->params.bssid,
682 				   NULL, 0, reason, false);
683  out:
684 	cfg80211_sme_free(wdev);
685 	return err;
686 }
687 
688 /*
689  * code shared for in-device and software SME
690  */
691 
cfg80211_is_all_idle(void)692 static bool cfg80211_is_all_idle(void)
693 {
694 	struct cfg80211_registered_device *rdev;
695 	struct wireless_dev *wdev;
696 	bool is_all_idle = true;
697 
698 	/*
699 	 * All devices must be idle as otherwise if you are actively
700 	 * scanning some new beacon hints could be learned and would
701 	 * count as new regulatory hints.
702 	 * Also if there is any other active beaconing interface we
703 	 * need not issue a disconnect hint and reset any info such
704 	 * as chan dfs state, etc.
705 	 */
706 	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
707 		list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
708 			wdev_lock(wdev);
709 			if (wdev->conn || wdev->connected ||
710 			    cfg80211_beaconing_iface_active(wdev))
711 				is_all_idle = false;
712 			wdev_unlock(wdev);
713 		}
714 	}
715 
716 	return is_all_idle;
717 }
718 
disconnect_work(struct work_struct * work)719 static void disconnect_work(struct work_struct *work)
720 {
721 	rtnl_lock();
722 	if (cfg80211_is_all_idle())
723 		regulatory_hint_disconnect();
724 	rtnl_unlock();
725 }
726 
727 DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
728 
729 static void
cfg80211_connect_result_release_bsses(struct wireless_dev * wdev,struct cfg80211_connect_resp_params * cr)730 cfg80211_connect_result_release_bsses(struct wireless_dev *wdev,
731 				      struct cfg80211_connect_resp_params *cr)
732 {
733 	unsigned int link;
734 
735 	for_each_valid_link(cr, link) {
736 		if (!cr->links[link].bss)
737 			continue;
738 		cfg80211_unhold_bss(bss_from_pub(cr->links[link].bss));
739 		cfg80211_put_bss(wdev->wiphy, cr->links[link].bss);
740 	}
741 }
742 
743 /*
744  * API calls for drivers implementing connect/disconnect and
745  * SME event handling
746  */
747 
748 /* This method must consume bss one way or another */
__cfg80211_connect_result(struct net_device * dev,struct cfg80211_connect_resp_params * cr,bool wextev)749 void __cfg80211_connect_result(struct net_device *dev,
750 			       struct cfg80211_connect_resp_params *cr,
751 			       bool wextev)
752 {
753 	struct wireless_dev *wdev = dev->ieee80211_ptr;
754 	const struct element *country_elem = NULL;
755 	const struct element *ssid;
756 	const u8 *country_data;
757 	u8 country_datalen;
758 #ifdef CONFIG_CFG80211_WEXT
759 	union iwreq_data wrqu;
760 #endif
761 	unsigned int link;
762 	const u8 *connected_addr;
763 	bool bss_not_found = false;
764 
765 	ASSERT_WDEV_LOCK(wdev);
766 
767 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
768 		    wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
769 		goto out;
770 
771 	if (cr->valid_links) {
772 		if (WARN_ON(!cr->ap_mld_addr))
773 			goto out;
774 
775 		for_each_valid_link(cr, link) {
776 			if (WARN_ON(!cr->links[link].addr))
777 				goto out;
778 		}
779 
780 		if (WARN_ON(wdev->connect_keys))
781 			goto out;
782 	}
783 
784 	wdev->unprot_beacon_reported = 0;
785 	nl80211_send_connect_result(wiphy_to_rdev(wdev->wiphy), dev, cr,
786 				    GFP_KERNEL);
787 	connected_addr = cr->valid_links ? cr->ap_mld_addr : cr->links[0].bssid;
788 
789 #ifdef CONFIG_CFG80211_WEXT
790 	if (wextev && !cr->valid_links) {
791 		if (cr->req_ie && cr->status == WLAN_STATUS_SUCCESS) {
792 			memset(&wrqu, 0, sizeof(wrqu));
793 			wrqu.data.length = cr->req_ie_len;
794 			wireless_send_event(dev, IWEVASSOCREQIE, &wrqu,
795 					    cr->req_ie);
796 		}
797 
798 		if (cr->resp_ie && cr->status == WLAN_STATUS_SUCCESS) {
799 			memset(&wrqu, 0, sizeof(wrqu));
800 			wrqu.data.length = cr->resp_ie_len;
801 			wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu,
802 					    cr->resp_ie);
803 		}
804 
805 		memset(&wrqu, 0, sizeof(wrqu));
806 		wrqu.ap_addr.sa_family = ARPHRD_ETHER;
807 		if (connected_addr && cr->status == WLAN_STATUS_SUCCESS) {
808 			memcpy(wrqu.ap_addr.sa_data, connected_addr, ETH_ALEN);
809 			memcpy(wdev->wext.prev_bssid, connected_addr, ETH_ALEN);
810 			wdev->wext.prev_bssid_valid = true;
811 		}
812 		wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
813 	}
814 #endif
815 
816 	if (cr->status == WLAN_STATUS_SUCCESS) {
817 		if (!wiphy_to_rdev(wdev->wiphy)->ops->connect) {
818 			for_each_valid_link(cr, link) {
819 				if (WARN_ON_ONCE(!cr->links[link].bss))
820 					break;
821 			}
822 		}
823 
824 		for_each_valid_link(cr, link) {
825 			/* don't do extra lookups for failures */
826 			if (cr->links[link].status != WLAN_STATUS_SUCCESS)
827 				continue;
828 
829 			if (cr->links[link].bss)
830 				continue;
831 
832 			cr->links[link].bss =
833 				cfg80211_get_bss(wdev->wiphy, NULL,
834 						 cr->links[link].bssid,
835 						 wdev->u.client.ssid,
836 						 wdev->u.client.ssid_len,
837 						 wdev->conn_bss_type,
838 						 IEEE80211_PRIVACY_ANY);
839 			if (!cr->links[link].bss) {
840 				bss_not_found = true;
841 				break;
842 			}
843 			cfg80211_hold_bss(bss_from_pub(cr->links[link].bss));
844 		}
845 	}
846 
847 	cfg80211_wdev_release_bsses(wdev);
848 
849 	if (cr->status != WLAN_STATUS_SUCCESS) {
850 		kfree_sensitive(wdev->connect_keys);
851 		wdev->connect_keys = NULL;
852 		wdev->u.client.ssid_len = 0;
853 		wdev->conn_owner_nlportid = 0;
854 		cfg80211_connect_result_release_bsses(wdev, cr);
855 		cfg80211_sme_free(wdev);
856 		return;
857 	}
858 
859 	if (WARN_ON(bss_not_found)) {
860 		cfg80211_connect_result_release_bsses(wdev, cr);
861 		return;
862 	}
863 
864 	memset(wdev->links, 0, sizeof(wdev->links));
865 	for_each_valid_link(cr, link) {
866 		if (cr->links[link].status == WLAN_STATUS_SUCCESS)
867 			continue;
868 		cr->valid_links &= ~BIT(link);
869 		/* don't require bss pointer for failed links */
870 		if (!cr->links[link].bss)
871 			continue;
872 		cfg80211_unhold_bss(bss_from_pub(cr->links[link].bss));
873 		cfg80211_put_bss(wdev->wiphy, cr->links[link].bss);
874 	}
875 	wdev->valid_links = cr->valid_links;
876 	for_each_valid_link(cr, link)
877 		wdev->links[link].client.current_bss =
878 			bss_from_pub(cr->links[link].bss);
879 	wdev->connected = true;
880 	ether_addr_copy(wdev->u.client.connected_addr, connected_addr);
881 	if (cr->valid_links) {
882 		for_each_valid_link(cr, link)
883 			memcpy(wdev->links[link].addr, cr->links[link].addr,
884 			       ETH_ALEN);
885 	}
886 
887 	cfg80211_upload_connect_keys(wdev);
888 
889 	rcu_read_lock();
890 	for_each_valid_link(cr, link) {
891 		country_elem =
892 			ieee80211_bss_get_elem(cr->links[link].bss,
893 					       WLAN_EID_COUNTRY);
894 		if (country_elem)
895 			break;
896 	}
897 	if (!country_elem) {
898 		rcu_read_unlock();
899 		return;
900 	}
901 
902 	country_datalen = country_elem->datalen;
903 	country_data = kmemdup(country_elem->data, country_datalen, GFP_ATOMIC);
904 	rcu_read_unlock();
905 
906 	if (!country_data)
907 		return;
908 
909 	regulatory_hint_country_ie(wdev->wiphy,
910 				   cr->links[link].bss->channel->band,
911 				   country_data, country_datalen);
912 	kfree(country_data);
913 
914 	if (!wdev->u.client.ssid_len) {
915 		rcu_read_lock();
916 		for_each_valid_link(cr, link) {
917 			ssid = ieee80211_bss_get_elem(cr->links[link].bss,
918 						      WLAN_EID_SSID);
919 
920 			if (!ssid || !ssid->datalen)
921 				continue;
922 
923 			memcpy(wdev->u.client.ssid, ssid->data, ssid->datalen);
924 			wdev->u.client.ssid_len = ssid->datalen;
925 			break;
926 		}
927 		rcu_read_unlock();
928 	}
929 
930 	return;
931 out:
932 	for_each_valid_link(cr, link)
933 		cfg80211_put_bss(wdev->wiphy, cr->links[link].bss);
934 }
935 
cfg80211_update_link_bss(struct wireless_dev * wdev,struct cfg80211_bss ** bss)936 static void cfg80211_update_link_bss(struct wireless_dev *wdev,
937 				     struct cfg80211_bss **bss)
938 {
939 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
940 	struct cfg80211_internal_bss *ibss;
941 
942 	if (!*bss)
943 		return;
944 
945 	ibss = bss_from_pub(*bss);
946 	if (list_empty(&ibss->list)) {
947 		struct cfg80211_bss *found = NULL, *tmp = *bss;
948 
949 		found = cfg80211_get_bss(wdev->wiphy, NULL,
950 					 (*bss)->bssid,
951 					 wdev->u.client.ssid,
952 					 wdev->u.client.ssid_len,
953 					 wdev->conn_bss_type,
954 					 IEEE80211_PRIVACY_ANY);
955 		if (found) {
956 			/* The same BSS is already updated so use it
957 			 * instead, as it has latest info.
958 			 */
959 			*bss = found;
960 		} else {
961 			/* Update with BSS provided by driver, it will
962 			 * be freshly added and ref cnted, we can free
963 			 * the old one.
964 			 *
965 			 * signal_valid can be false, as we are not
966 			 * expecting the BSS to be found.
967 			 *
968 			 * keep the old timestamp to avoid confusion
969 			 */
970 			cfg80211_bss_update(rdev, ibss, false,
971 					    ibss->ts);
972 		}
973 
974 		cfg80211_put_bss(wdev->wiphy, tmp);
975 	}
976 }
977 
978 /* Consumes bss object(s) one way or another */
cfg80211_connect_done(struct net_device * dev,struct cfg80211_connect_resp_params * params,gfp_t gfp)979 void cfg80211_connect_done(struct net_device *dev,
980 			   struct cfg80211_connect_resp_params *params,
981 			   gfp_t gfp)
982 {
983 	struct wireless_dev *wdev = dev->ieee80211_ptr;
984 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
985 	struct cfg80211_event *ev;
986 	unsigned long flags;
987 	u8 *next;
988 	size_t link_info_size = 0;
989 	unsigned int link;
990 
991 	for_each_valid_link(params, link) {
992 		cfg80211_update_link_bss(wdev, &params->links[link].bss);
993 		link_info_size += params->links[link].bssid ? ETH_ALEN : 0;
994 		link_info_size += params->links[link].addr ? ETH_ALEN : 0;
995 	}
996 
997 	ev = kzalloc(sizeof(*ev) + (params->ap_mld_addr ? ETH_ALEN : 0) +
998 		     params->req_ie_len + params->resp_ie_len +
999 		     params->fils.kek_len + params->fils.pmk_len +
1000 		     (params->fils.pmkid ? WLAN_PMKID_LEN : 0) + link_info_size,
1001 		     gfp);
1002 
1003 	if (!ev) {
1004 		for_each_valid_link(params, link)
1005 			cfg80211_put_bss(wdev->wiphy,
1006 					 params->links[link].bss);
1007 		return;
1008 	}
1009 
1010 	ev->type = EVENT_CONNECT_RESULT;
1011 	next = ((u8 *)ev) + sizeof(*ev);
1012 	if (params->ap_mld_addr) {
1013 		ev->cr.ap_mld_addr = next;
1014 		memcpy((void *)ev->cr.ap_mld_addr, params->ap_mld_addr,
1015 		       ETH_ALEN);
1016 		next += ETH_ALEN;
1017 	}
1018 	if (params->req_ie_len) {
1019 		ev->cr.req_ie = next;
1020 		ev->cr.req_ie_len = params->req_ie_len;
1021 		memcpy((void *)ev->cr.req_ie, params->req_ie,
1022 		       params->req_ie_len);
1023 		next += params->req_ie_len;
1024 	}
1025 	if (params->resp_ie_len) {
1026 		ev->cr.resp_ie = next;
1027 		ev->cr.resp_ie_len = params->resp_ie_len;
1028 		memcpy((void *)ev->cr.resp_ie, params->resp_ie,
1029 		       params->resp_ie_len);
1030 		next += params->resp_ie_len;
1031 	}
1032 	if (params->fils.kek_len) {
1033 		ev->cr.fils.kek = next;
1034 		ev->cr.fils.kek_len = params->fils.kek_len;
1035 		memcpy((void *)ev->cr.fils.kek, params->fils.kek,
1036 		       params->fils.kek_len);
1037 		next += params->fils.kek_len;
1038 	}
1039 	if (params->fils.pmk_len) {
1040 		ev->cr.fils.pmk = next;
1041 		ev->cr.fils.pmk_len = params->fils.pmk_len;
1042 		memcpy((void *)ev->cr.fils.pmk, params->fils.pmk,
1043 		       params->fils.pmk_len);
1044 		next += params->fils.pmk_len;
1045 	}
1046 	if (params->fils.pmkid) {
1047 		ev->cr.fils.pmkid = next;
1048 		memcpy((void *)ev->cr.fils.pmkid, params->fils.pmkid,
1049 		       WLAN_PMKID_LEN);
1050 		next += WLAN_PMKID_LEN;
1051 	}
1052 	ev->cr.fils.update_erp_next_seq_num = params->fils.update_erp_next_seq_num;
1053 	if (params->fils.update_erp_next_seq_num)
1054 		ev->cr.fils.erp_next_seq_num = params->fils.erp_next_seq_num;
1055 	ev->cr.valid_links = params->valid_links;
1056 	for_each_valid_link(params, link) {
1057 		if (params->links[link].bss)
1058 			cfg80211_hold_bss(
1059 				bss_from_pub(params->links[link].bss));
1060 		ev->cr.links[link].bss = params->links[link].bss;
1061 		ev->cr.links[link].status = params->links[link].status;
1062 
1063 		if (params->links[link].addr) {
1064 			ev->cr.links[link].addr = next;
1065 			memcpy((void *)ev->cr.links[link].addr,
1066 			       params->links[link].addr,
1067 			       ETH_ALEN);
1068 			next += ETH_ALEN;
1069 		}
1070 		if (params->links[link].bssid) {
1071 			ev->cr.links[link].bssid = next;
1072 			memcpy((void *)ev->cr.links[link].bssid,
1073 			       params->links[link].bssid,
1074 			       ETH_ALEN);
1075 			next += ETH_ALEN;
1076 		}
1077 	}
1078 	ev->cr.status = params->status;
1079 	ev->cr.timeout_reason = params->timeout_reason;
1080 
1081 	spin_lock_irqsave(&wdev->event_lock, flags);
1082 	list_add_tail(&ev->list, &wdev->event_list);
1083 	spin_unlock_irqrestore(&wdev->event_lock, flags);
1084 	queue_work(cfg80211_wq, &rdev->event_work);
1085 }
1086 EXPORT_SYMBOL(cfg80211_connect_done);
1087 
1088 /* Consumes bss object one way or another */
__cfg80211_roamed(struct wireless_dev * wdev,struct cfg80211_roam_info * info)1089 void __cfg80211_roamed(struct wireless_dev *wdev,
1090 		       struct cfg80211_roam_info *info)
1091 {
1092 #ifdef CONFIG_CFG80211_WEXT
1093 	union iwreq_data wrqu;
1094 #endif
1095 	unsigned int link;
1096 	const u8 *connected_addr;
1097 
1098 	ASSERT_WDEV_LOCK(wdev);
1099 
1100 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
1101 		    wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
1102 		goto out;
1103 
1104 	if (WARN_ON(!wdev->connected))
1105 		goto out;
1106 
1107 	if (info->valid_links) {
1108 		if (WARN_ON(!info->ap_mld_addr))
1109 			goto out;
1110 
1111 		for_each_valid_link(info, link) {
1112 			if (WARN_ON(!info->links[link].addr))
1113 				goto out;
1114 		}
1115 	}
1116 
1117 	cfg80211_wdev_release_bsses(wdev);
1118 
1119 	for_each_valid_link(info, link) {
1120 		if (WARN_ON(!info->links[link].bss))
1121 			goto out;
1122 	}
1123 
1124 	memset(wdev->links, 0, sizeof(wdev->links));
1125 	wdev->valid_links = info->valid_links;
1126 	for_each_valid_link(info, link) {
1127 		cfg80211_hold_bss(bss_from_pub(info->links[link].bss));
1128 		wdev->links[link].client.current_bss =
1129 			bss_from_pub(info->links[link].bss);
1130 	}
1131 
1132 	connected_addr = info->valid_links ?
1133 			 info->ap_mld_addr :
1134 			 info->links[0].bss->bssid;
1135 	ether_addr_copy(wdev->u.client.connected_addr, connected_addr);
1136 	if (info->valid_links) {
1137 		for_each_valid_link(info, link)
1138 			memcpy(wdev->links[link].addr, info->links[link].addr,
1139 			       ETH_ALEN);
1140 	}
1141 	wdev->unprot_beacon_reported = 0;
1142 	nl80211_send_roamed(wiphy_to_rdev(wdev->wiphy),
1143 			    wdev->netdev, info, GFP_KERNEL);
1144 
1145 #ifdef CONFIG_CFG80211_WEXT
1146 	if (!info->valid_links) {
1147 		if (info->req_ie) {
1148 			memset(&wrqu, 0, sizeof(wrqu));
1149 			wrqu.data.length = info->req_ie_len;
1150 			wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
1151 					    &wrqu, info->req_ie);
1152 		}
1153 
1154 		if (info->resp_ie) {
1155 			memset(&wrqu, 0, sizeof(wrqu));
1156 			wrqu.data.length = info->resp_ie_len;
1157 			wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
1158 					    &wrqu, info->resp_ie);
1159 		}
1160 
1161 		memset(&wrqu, 0, sizeof(wrqu));
1162 		wrqu.ap_addr.sa_family = ARPHRD_ETHER;
1163 		memcpy(wrqu.ap_addr.sa_data, connected_addr, ETH_ALEN);
1164 		memcpy(wdev->wext.prev_bssid, connected_addr, ETH_ALEN);
1165 		wdev->wext.prev_bssid_valid = true;
1166 		wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
1167 	}
1168 #endif
1169 
1170 	return;
1171 out:
1172 	for_each_valid_link(info, link)
1173 		cfg80211_put_bss(wdev->wiphy, info->links[link].bss);
1174 }
1175 
1176 /* Consumes info->links.bss object(s) one way or another */
cfg80211_roamed(struct net_device * dev,struct cfg80211_roam_info * info,gfp_t gfp)1177 void cfg80211_roamed(struct net_device *dev, struct cfg80211_roam_info *info,
1178 		     gfp_t gfp)
1179 {
1180 	struct wireless_dev *wdev = dev->ieee80211_ptr;
1181 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1182 	struct cfg80211_event *ev;
1183 	unsigned long flags;
1184 	u8 *next;
1185 	unsigned int link;
1186 	size_t link_info_size = 0;
1187 	bool bss_not_found = false;
1188 
1189 	for_each_valid_link(info, link) {
1190 		link_info_size += info->links[link].addr ? ETH_ALEN : 0;
1191 		link_info_size += info->links[link].bssid ? ETH_ALEN : 0;
1192 
1193 		if (info->links[link].bss)
1194 			continue;
1195 
1196 		info->links[link].bss =
1197 			cfg80211_get_bss(wdev->wiphy,
1198 					 info->links[link].channel,
1199 					 info->links[link].bssid,
1200 					 wdev->u.client.ssid,
1201 					 wdev->u.client.ssid_len,
1202 					 wdev->conn_bss_type,
1203 					 IEEE80211_PRIVACY_ANY);
1204 
1205 		if (!info->links[link].bss) {
1206 			bss_not_found = true;
1207 			break;
1208 		}
1209 	}
1210 
1211 	if (WARN_ON(bss_not_found))
1212 		goto out;
1213 
1214 	ev = kzalloc(sizeof(*ev) + info->req_ie_len + info->resp_ie_len +
1215 		     info->fils.kek_len + info->fils.pmk_len +
1216 		     (info->fils.pmkid ? WLAN_PMKID_LEN : 0) +
1217 		     (info->ap_mld_addr ? ETH_ALEN : 0) + link_info_size, gfp);
1218 	if (!ev)
1219 		goto out;
1220 
1221 	ev->type = EVENT_ROAMED;
1222 	next = ((u8 *)ev) + sizeof(*ev);
1223 	if (info->req_ie_len) {
1224 		ev->rm.req_ie = next;
1225 		ev->rm.req_ie_len = info->req_ie_len;
1226 		memcpy((void *)ev->rm.req_ie, info->req_ie, info->req_ie_len);
1227 		next += info->req_ie_len;
1228 	}
1229 	if (info->resp_ie_len) {
1230 		ev->rm.resp_ie = next;
1231 		ev->rm.resp_ie_len = info->resp_ie_len;
1232 		memcpy((void *)ev->rm.resp_ie, info->resp_ie,
1233 		       info->resp_ie_len);
1234 		next += info->resp_ie_len;
1235 	}
1236 	if (info->fils.kek_len) {
1237 		ev->rm.fils.kek = next;
1238 		ev->rm.fils.kek_len = info->fils.kek_len;
1239 		memcpy((void *)ev->rm.fils.kek, info->fils.kek,
1240 		       info->fils.kek_len);
1241 		next += info->fils.kek_len;
1242 	}
1243 	if (info->fils.pmk_len) {
1244 		ev->rm.fils.pmk = next;
1245 		ev->rm.fils.pmk_len = info->fils.pmk_len;
1246 		memcpy((void *)ev->rm.fils.pmk, info->fils.pmk,
1247 		       info->fils.pmk_len);
1248 		next += info->fils.pmk_len;
1249 	}
1250 	if (info->fils.pmkid) {
1251 		ev->rm.fils.pmkid = next;
1252 		memcpy((void *)ev->rm.fils.pmkid, info->fils.pmkid,
1253 		       WLAN_PMKID_LEN);
1254 		next += WLAN_PMKID_LEN;
1255 	}
1256 	ev->rm.fils.update_erp_next_seq_num = info->fils.update_erp_next_seq_num;
1257 	if (info->fils.update_erp_next_seq_num)
1258 		ev->rm.fils.erp_next_seq_num = info->fils.erp_next_seq_num;
1259 	if (info->ap_mld_addr) {
1260 		ev->rm.ap_mld_addr = next;
1261 		memcpy((void *)ev->rm.ap_mld_addr, info->ap_mld_addr,
1262 		       ETH_ALEN);
1263 		next += ETH_ALEN;
1264 	}
1265 	ev->rm.valid_links = info->valid_links;
1266 	for_each_valid_link(info, link) {
1267 		ev->rm.links[link].bss = info->links[link].bss;
1268 
1269 		if (info->links[link].addr) {
1270 			ev->rm.links[link].addr = next;
1271 			memcpy((void *)ev->rm.links[link].addr,
1272 			       info->links[link].addr,
1273 			       ETH_ALEN);
1274 			next += ETH_ALEN;
1275 		}
1276 
1277 		if (info->links[link].bssid) {
1278 			ev->rm.links[link].bssid = next;
1279 			memcpy((void *)ev->rm.links[link].bssid,
1280 			       info->links[link].bssid,
1281 			       ETH_ALEN);
1282 			next += ETH_ALEN;
1283 		}
1284 	}
1285 
1286 	spin_lock_irqsave(&wdev->event_lock, flags);
1287 	list_add_tail(&ev->list, &wdev->event_list);
1288 	spin_unlock_irqrestore(&wdev->event_lock, flags);
1289 	queue_work(cfg80211_wq, &rdev->event_work);
1290 
1291 	return;
1292 out:
1293 	for_each_valid_link(info, link)
1294 		cfg80211_put_bss(wdev->wiphy, info->links[link].bss);
1295 
1296 }
1297 EXPORT_SYMBOL(cfg80211_roamed);
1298 
__cfg80211_port_authorized(struct wireless_dev * wdev,const u8 * bssid,const u8 * td_bitmap,u8 td_bitmap_len)1299 void __cfg80211_port_authorized(struct wireless_dev *wdev, const u8 *bssid,
1300 					const u8 *td_bitmap, u8 td_bitmap_len)
1301 {
1302 	ASSERT_WDEV_LOCK(wdev);
1303 
1304 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
1305 		    wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
1306 		return;
1307 
1308 	if (WARN_ON(!wdev->connected) ||
1309 	    WARN_ON(!ether_addr_equal(wdev->u.client.connected_addr, bssid)))
1310 		return;
1311 
1312 	nl80211_send_port_authorized(wiphy_to_rdev(wdev->wiphy), wdev->netdev,
1313 				     bssid, td_bitmap, td_bitmap_len);
1314 }
1315 
cfg80211_port_authorized(struct net_device * dev,const u8 * bssid,const u8 * td_bitmap,u8 td_bitmap_len,gfp_t gfp)1316 void cfg80211_port_authorized(struct net_device *dev, const u8 *bssid,
1317 			      const u8 *td_bitmap, u8 td_bitmap_len, gfp_t gfp)
1318 {
1319 	struct wireless_dev *wdev = dev->ieee80211_ptr;
1320 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1321 	struct cfg80211_event *ev;
1322 	unsigned long flags;
1323 
1324 	if (WARN_ON(!bssid))
1325 		return;
1326 
1327 	ev = kzalloc(sizeof(*ev) + td_bitmap_len, gfp);
1328 	if (!ev)
1329 		return;
1330 
1331 	ev->type = EVENT_PORT_AUTHORIZED;
1332 	memcpy(ev->pa.bssid, bssid, ETH_ALEN);
1333 	ev->pa.td_bitmap = ((u8 *)ev) + sizeof(*ev);
1334 	ev->pa.td_bitmap_len = td_bitmap_len;
1335 	memcpy((void *)ev->pa.td_bitmap, td_bitmap, td_bitmap_len);
1336 
1337 	/*
1338 	 * Use the wdev event list so that if there are pending
1339 	 * connected/roamed events, they will be reported first.
1340 	 */
1341 	spin_lock_irqsave(&wdev->event_lock, flags);
1342 	list_add_tail(&ev->list, &wdev->event_list);
1343 	spin_unlock_irqrestore(&wdev->event_lock, flags);
1344 	queue_work(cfg80211_wq, &rdev->event_work);
1345 }
1346 EXPORT_SYMBOL(cfg80211_port_authorized);
1347 
__cfg80211_disconnected(struct net_device * dev,const u8 * ie,size_t ie_len,u16 reason,bool from_ap)1348 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
1349 			     size_t ie_len, u16 reason, bool from_ap)
1350 {
1351 	struct wireless_dev *wdev = dev->ieee80211_ptr;
1352 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1353 	int i;
1354 #ifdef CONFIG_CFG80211_WEXT
1355 	union iwreq_data wrqu;
1356 #endif
1357 
1358 	ASSERT_WDEV_LOCK(wdev);
1359 
1360 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
1361 		    wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
1362 		return;
1363 
1364 	cfg80211_wdev_release_bsses(wdev);
1365 	wdev->connected = false;
1366 	wdev->u.client.ssid_len = 0;
1367 	wdev->conn_owner_nlportid = 0;
1368 	kfree_sensitive(wdev->connect_keys);
1369 	wdev->connect_keys = NULL;
1370 
1371 	nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
1372 
1373 	/* stop critical protocol if supported */
1374 	if (rdev->ops->crit_proto_stop && rdev->crit_proto_nlportid) {
1375 		rdev->crit_proto_nlportid = 0;
1376 		rdev_crit_proto_stop(rdev, wdev);
1377 	}
1378 
1379 	/*
1380 	 * Delete all the keys ... pairwise keys can't really
1381 	 * exist any more anyway, but default keys might.
1382 	 */
1383 	if (rdev->ops->del_key) {
1384 		int max_key_idx = 5;
1385 
1386 		if (wiphy_ext_feature_isset(
1387 			    wdev->wiphy,
1388 			    NL80211_EXT_FEATURE_BEACON_PROTECTION) ||
1389 		    wiphy_ext_feature_isset(
1390 			    wdev->wiphy,
1391 			    NL80211_EXT_FEATURE_BEACON_PROTECTION_CLIENT))
1392 			max_key_idx = 7;
1393 		for (i = 0; i <= max_key_idx; i++)
1394 			rdev_del_key(rdev, dev, -1, i, false, NULL);
1395 	}
1396 
1397 	rdev_set_qos_map(rdev, dev, NULL);
1398 
1399 #ifdef CONFIG_CFG80211_WEXT
1400 	memset(&wrqu, 0, sizeof(wrqu));
1401 	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
1402 	wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
1403 	wdev->wext.connect.ssid_len = 0;
1404 #endif
1405 
1406 	schedule_work(&cfg80211_disconnect_work);
1407 }
1408 
cfg80211_disconnected(struct net_device * dev,u16 reason,const u8 * ie,size_t ie_len,bool locally_generated,gfp_t gfp)1409 void cfg80211_disconnected(struct net_device *dev, u16 reason,
1410 			   const u8 *ie, size_t ie_len,
1411 			   bool locally_generated, gfp_t gfp)
1412 {
1413 	struct wireless_dev *wdev = dev->ieee80211_ptr;
1414 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1415 	struct cfg80211_event *ev;
1416 	unsigned long flags;
1417 
1418 	ev = kzalloc(sizeof(*ev) + ie_len, gfp);
1419 	if (!ev)
1420 		return;
1421 
1422 	ev->type = EVENT_DISCONNECTED;
1423 	ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
1424 	ev->dc.ie_len = ie_len;
1425 	memcpy((void *)ev->dc.ie, ie, ie_len);
1426 	ev->dc.reason = reason;
1427 	ev->dc.locally_generated = locally_generated;
1428 
1429 	spin_lock_irqsave(&wdev->event_lock, flags);
1430 	list_add_tail(&ev->list, &wdev->event_list);
1431 	spin_unlock_irqrestore(&wdev->event_lock, flags);
1432 	queue_work(cfg80211_wq, &rdev->event_work);
1433 }
1434 EXPORT_SYMBOL(cfg80211_disconnected);
1435 
1436 /*
1437  * API calls for nl80211/wext compatibility code
1438  */
cfg80211_connect(struct cfg80211_registered_device * rdev,struct net_device * dev,struct cfg80211_connect_params * connect,struct cfg80211_cached_keys * connkeys,const u8 * prev_bssid)1439 int cfg80211_connect(struct cfg80211_registered_device *rdev,
1440 		     struct net_device *dev,
1441 		     struct cfg80211_connect_params *connect,
1442 		     struct cfg80211_cached_keys *connkeys,
1443 		     const u8 *prev_bssid)
1444 {
1445 	struct wireless_dev *wdev = dev->ieee80211_ptr;
1446 	int err;
1447 
1448 	ASSERT_WDEV_LOCK(wdev);
1449 
1450 	/*
1451 	 * If we have an ssid_len, we're trying to connect or are
1452 	 * already connected, so reject a new SSID unless it's the
1453 	 * same (which is the case for re-association.)
1454 	 */
1455 	if (wdev->u.client.ssid_len &&
1456 	    (wdev->u.client.ssid_len != connect->ssid_len ||
1457 	     memcmp(wdev->u.client.ssid, connect->ssid, wdev->u.client.ssid_len)))
1458 		return -EALREADY;
1459 
1460 	/*
1461 	 * If connected, reject (re-)association unless prev_bssid
1462 	 * matches the current BSSID.
1463 	 */
1464 	if (wdev->connected) {
1465 		if (!prev_bssid)
1466 			return -EALREADY;
1467 		if (!ether_addr_equal(prev_bssid,
1468 				      wdev->u.client.connected_addr))
1469 			return -ENOTCONN;
1470 	}
1471 
1472 	/*
1473 	 * Reject if we're in the process of connecting with WEP,
1474 	 * this case isn't very interesting and trying to handle
1475 	 * it would make the code much more complex.
1476 	 */
1477 	if (wdev->connect_keys)
1478 		return -EINPROGRESS;
1479 
1480 	cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
1481 				  rdev->wiphy.ht_capa_mod_mask);
1482 	cfg80211_oper_and_vht_capa(&connect->vht_capa_mask,
1483 				   rdev->wiphy.vht_capa_mod_mask);
1484 
1485 	if (connkeys && connkeys->def >= 0) {
1486 		int idx;
1487 		u32 cipher;
1488 
1489 		idx = connkeys->def;
1490 		cipher = connkeys->params[idx].cipher;
1491 		/* If given a WEP key we may need it for shared key auth */
1492 		if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
1493 		    cipher == WLAN_CIPHER_SUITE_WEP104) {
1494 			connect->key_idx = idx;
1495 			connect->key = connkeys->params[idx].key;
1496 			connect->key_len = connkeys->params[idx].key_len;
1497 
1498 			/*
1499 			 * If ciphers are not set (e.g. when going through
1500 			 * iwconfig), we have to set them appropriately here.
1501 			 */
1502 			if (connect->crypto.cipher_group == 0)
1503 				connect->crypto.cipher_group = cipher;
1504 
1505 			if (connect->crypto.n_ciphers_pairwise == 0) {
1506 				connect->crypto.n_ciphers_pairwise = 1;
1507 				connect->crypto.ciphers_pairwise[0] = cipher;
1508 			}
1509 		}
1510 	} else {
1511 		if (WARN_ON(connkeys))
1512 			return -EINVAL;
1513 
1514 		/* connect can point to wdev->wext.connect which
1515 		 * can hold key data from a previous connection
1516 		 */
1517 		connect->key = NULL;
1518 		connect->key_len = 0;
1519 		connect->key_idx = 0;
1520 	}
1521 
1522 	wdev->connect_keys = connkeys;
1523 	memcpy(wdev->u.client.ssid, connect->ssid, connect->ssid_len);
1524 	wdev->u.client.ssid_len = connect->ssid_len;
1525 
1526 	wdev->conn_bss_type = connect->pbss ? IEEE80211_BSS_TYPE_PBSS :
1527 					      IEEE80211_BSS_TYPE_ESS;
1528 
1529 	if (!rdev->ops->connect)
1530 		err = cfg80211_sme_connect(wdev, connect, prev_bssid);
1531 	else
1532 		err = rdev_connect(rdev, dev, connect);
1533 
1534 	if (err) {
1535 		wdev->connect_keys = NULL;
1536 		/*
1537 		 * This could be reassoc getting refused, don't clear
1538 		 * ssid_len in that case.
1539 		 */
1540 		if (!wdev->connected)
1541 			wdev->u.client.ssid_len = 0;
1542 		return err;
1543 	}
1544 
1545 	return 0;
1546 }
1547 
cfg80211_disconnect(struct cfg80211_registered_device * rdev,struct net_device * dev,u16 reason,bool wextev)1548 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
1549 			struct net_device *dev, u16 reason, bool wextev)
1550 {
1551 	struct wireless_dev *wdev = dev->ieee80211_ptr;
1552 	int err = 0;
1553 
1554 	ASSERT_WDEV_LOCK(wdev);
1555 
1556 	kfree_sensitive(wdev->connect_keys);
1557 	wdev->connect_keys = NULL;
1558 
1559 	wdev->conn_owner_nlportid = 0;
1560 
1561 	if (wdev->conn)
1562 		err = cfg80211_sme_disconnect(wdev, reason);
1563 	else if (!rdev->ops->disconnect)
1564 		cfg80211_mlme_down(rdev, dev);
1565 	else if (wdev->u.client.ssid_len)
1566 		err = rdev_disconnect(rdev, dev, reason);
1567 
1568 	/*
1569 	 * Clear ssid_len unless we actually were fully connected,
1570 	 * in which case cfg80211_disconnected() will take care of
1571 	 * this later.
1572 	 */
1573 	if (!wdev->connected)
1574 		wdev->u.client.ssid_len = 0;
1575 
1576 	return err;
1577 }
1578 
1579 /*
1580  * Used to clean up after the connection / connection attempt owner socket
1581  * disconnects
1582  */
cfg80211_autodisconnect_wk(struct work_struct * work)1583 void cfg80211_autodisconnect_wk(struct work_struct *work)
1584 {
1585 	struct wireless_dev *wdev =
1586 		container_of(work, struct wireless_dev, disconnect_wk);
1587 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1588 
1589 	wiphy_lock(wdev->wiphy);
1590 	wdev_lock(wdev);
1591 
1592 	if (wdev->conn_owner_nlportid) {
1593 		switch (wdev->iftype) {
1594 		case NL80211_IFTYPE_ADHOC:
1595 			__cfg80211_leave_ibss(rdev, wdev->netdev, false);
1596 			break;
1597 		case NL80211_IFTYPE_AP:
1598 		case NL80211_IFTYPE_P2P_GO:
1599 			__cfg80211_stop_ap(rdev, wdev->netdev, -1, false);
1600 			break;
1601 		case NL80211_IFTYPE_MESH_POINT:
1602 			__cfg80211_leave_mesh(rdev, wdev->netdev);
1603 			break;
1604 		case NL80211_IFTYPE_STATION:
1605 		case NL80211_IFTYPE_P2P_CLIENT:
1606 			/*
1607 			 * Use disconnect_bssid if still connecting and
1608 			 * ops->disconnect not implemented.  Otherwise we can
1609 			 * use cfg80211_disconnect.
1610 			 */
1611 			if (rdev->ops->disconnect || wdev->connected)
1612 				cfg80211_disconnect(rdev, wdev->netdev,
1613 						    WLAN_REASON_DEAUTH_LEAVING,
1614 						    true);
1615 			else
1616 				cfg80211_mlme_deauth(rdev, wdev->netdev,
1617 						     wdev->disconnect_bssid,
1618 						     NULL, 0,
1619 						     WLAN_REASON_DEAUTH_LEAVING,
1620 						     false);
1621 			break;
1622 		default:
1623 			break;
1624 		}
1625 	}
1626 
1627 	wdev_unlock(wdev);
1628 	wiphy_unlock(wdev->wiphy);
1629 }
1630