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, 2022-2024 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_med_sync_delay((const u8 *)mle_a) !=
344 ieee80211_mle_get_eml_med_sync_delay((const u8 *)mle_b)) {
345 NL_SET_ERR_MSG(extack, "link EML medium sync delay mismatch");
346 return -EINVAL;
347 }
348
349 if (ieee80211_mle_get_eml_cap((const u8 *)mle_a) !=
350 ieee80211_mle_get_eml_cap((const u8 *)mle_b)) {
351 NL_SET_ERR_MSG(extack, "link EML capabilities mismatch");
352 return -EINVAL;
353 }
354
355 if (ieee80211_mle_get_mld_capa_op((const u8 *)mle_a) !=
356 ieee80211_mle_get_mld_capa_op((const u8 *)mle_b)) {
357 NL_SET_ERR_MSG(extack, "link MLD capabilities/ops mismatch");
358 return -EINVAL;
359 }
360
361 return 0;
362 }
363
cfg80211_mlme_check_mlo(struct net_device * dev,struct cfg80211_assoc_request * req,struct netlink_ext_ack * extack)364 static int cfg80211_mlme_check_mlo(struct net_device *dev,
365 struct cfg80211_assoc_request *req,
366 struct netlink_ext_ack *extack)
367 {
368 const struct ieee80211_multi_link_elem *mles[ARRAY_SIZE(req->links)] = {};
369 int i;
370
371 if (req->link_id < 0)
372 return 0;
373
374 if (!req->links[req->link_id].bss) {
375 NL_SET_ERR_MSG(extack, "no BSS for assoc link");
376 return -EINVAL;
377 }
378
379 rcu_read_lock();
380 for (i = 0; i < ARRAY_SIZE(req->links); i++) {
381 const struct cfg80211_bss_ies *ies;
382 const struct element *ml;
383
384 if (!req->links[i].bss)
385 continue;
386
387 if (ether_addr_equal(req->links[i].bss->bssid, dev->dev_addr)) {
388 NL_SET_ERR_MSG(extack, "BSSID must not be our address");
389 req->links[i].error = -EINVAL;
390 goto error;
391 }
392
393 ies = rcu_dereference(req->links[i].bss->ies);
394 ml = cfg80211_find_ext_elem(WLAN_EID_EXT_EHT_MULTI_LINK,
395 ies->data, ies->len);
396 if (!ml) {
397 NL_SET_ERR_MSG(extack, "MLO BSS w/o ML element");
398 req->links[i].error = -EINVAL;
399 goto error;
400 }
401
402 if (!ieee80211_mle_type_ok(ml->data + 1,
403 IEEE80211_ML_CONTROL_TYPE_BASIC,
404 ml->datalen - 1)) {
405 NL_SET_ERR_MSG(extack, "BSS with invalid ML element");
406 req->links[i].error = -EINVAL;
407 goto error;
408 }
409
410 mles[i] = (const void *)(ml->data + 1);
411
412 if (ieee80211_mle_get_link_id((const u8 *)mles[i]) != i) {
413 NL_SET_ERR_MSG(extack, "link ID mismatch");
414 req->links[i].error = -EINVAL;
415 goto error;
416 }
417 }
418
419 if (WARN_ON(!mles[req->link_id]))
420 goto error;
421
422 for (i = 0; i < ARRAY_SIZE(req->links); i++) {
423 if (i == req->link_id || !req->links[i].bss)
424 continue;
425
426 if (WARN_ON(!mles[i]))
427 goto error;
428
429 if (cfg80211_mlme_check_mlo_compat(mles[req->link_id], mles[i],
430 extack)) {
431 req->links[i].error = -EINVAL;
432 goto error;
433 }
434 }
435
436 rcu_read_unlock();
437 return 0;
438 error:
439 rcu_read_unlock();
440 return -EINVAL;
441 }
442
443 /* 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)444 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
445 struct net_device *dev,
446 struct cfg80211_assoc_request *req,
447 struct netlink_ext_ack *extack)
448 {
449 struct wireless_dev *wdev = dev->ieee80211_ptr;
450 int err;
451
452 lockdep_assert_wiphy(wdev->wiphy);
453
454 err = cfg80211_mlme_check_mlo(dev, req, extack);
455 if (err)
456 return err;
457
458 if (wdev->connected &&
459 (!req->prev_bssid ||
460 !ether_addr_equal(wdev->u.client.connected_addr, req->prev_bssid)))
461 return -EALREADY;
462
463 if ((req->bss && ether_addr_equal(req->bss->bssid, dev->dev_addr)) ||
464 (req->link_id >= 0 &&
465 ether_addr_equal(req->ap_mld_addr, dev->dev_addr)))
466 return -EINVAL;
467
468 cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
469 rdev->wiphy.ht_capa_mod_mask);
470 cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
471 rdev->wiphy.vht_capa_mod_mask);
472
473 err = rdev_assoc(rdev, dev, req);
474 if (!err) {
475 int link_id;
476
477 if (req->bss) {
478 cfg80211_ref_bss(&rdev->wiphy, req->bss);
479 cfg80211_hold_bss(bss_from_pub(req->bss));
480 }
481
482 for (link_id = 0; link_id < ARRAY_SIZE(req->links); link_id++) {
483 if (!req->links[link_id].bss)
484 continue;
485 cfg80211_ref_bss(&rdev->wiphy, req->links[link_id].bss);
486 cfg80211_hold_bss(bss_from_pub(req->links[link_id].bss));
487 }
488 }
489 return err;
490 }
491
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)492 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
493 struct net_device *dev, const u8 *bssid,
494 const u8 *ie, int ie_len, u16 reason,
495 bool local_state_change)
496 {
497 struct wireless_dev *wdev = dev->ieee80211_ptr;
498 struct cfg80211_deauth_request req = {
499 .bssid = bssid,
500 .reason_code = reason,
501 .ie = ie,
502 .ie_len = ie_len,
503 .local_state_change = local_state_change,
504 };
505
506 lockdep_assert_wiphy(wdev->wiphy);
507
508 if (local_state_change &&
509 (!wdev->connected ||
510 !ether_addr_equal(wdev->u.client.connected_addr, bssid)))
511 return 0;
512
513 if (ether_addr_equal(wdev->disconnect_bssid, bssid) ||
514 (wdev->connected &&
515 ether_addr_equal(wdev->u.client.connected_addr, bssid)))
516 wdev->conn_owner_nlportid = 0;
517
518 return rdev_deauth(rdev, dev, &req);
519 }
520
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)521 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
522 struct net_device *dev, const u8 *ap_addr,
523 const u8 *ie, int ie_len, u16 reason,
524 bool local_state_change)
525 {
526 struct wireless_dev *wdev = dev->ieee80211_ptr;
527 struct cfg80211_disassoc_request req = {
528 .reason_code = reason,
529 .local_state_change = local_state_change,
530 .ie = ie,
531 .ie_len = ie_len,
532 .ap_addr = ap_addr,
533 };
534 int err;
535
536 lockdep_assert_wiphy(wdev->wiphy);
537
538 if (!wdev->connected)
539 return -ENOTCONN;
540
541 if (memcmp(wdev->u.client.connected_addr, ap_addr, ETH_ALEN))
542 return -ENOTCONN;
543
544 err = rdev_disassoc(rdev, dev, &req);
545 if (err)
546 return err;
547
548 /* driver should have reported the disassoc */
549 WARN_ON(wdev->connected);
550 return 0;
551 }
552
cfg80211_mlme_down(struct cfg80211_registered_device * rdev,struct net_device * dev)553 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
554 struct net_device *dev)
555 {
556 struct wireless_dev *wdev = dev->ieee80211_ptr;
557 u8 bssid[ETH_ALEN];
558
559 lockdep_assert_wiphy(wdev->wiphy);
560
561 if (!rdev->ops->deauth)
562 return;
563
564 if (!wdev->connected)
565 return;
566
567 memcpy(bssid, wdev->u.client.connected_addr, ETH_ALEN);
568 cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
569 WLAN_REASON_DEAUTH_LEAVING, false);
570 }
571
572 struct cfg80211_mgmt_registration {
573 struct list_head list;
574 struct wireless_dev *wdev;
575
576 u32 nlportid;
577
578 int match_len;
579
580 __le16 frame_type;
581
582 bool multicast_rx;
583
584 u8 match[];
585 };
586
cfg80211_mgmt_registrations_update(struct wireless_dev * wdev)587 static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev)
588 {
589 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
590 struct wireless_dev *tmp;
591 struct cfg80211_mgmt_registration *reg;
592 struct mgmt_frame_regs upd = {};
593
594 lockdep_assert_held(&rdev->wiphy.mtx);
595
596 spin_lock_bh(&rdev->mgmt_registrations_lock);
597 if (!wdev->mgmt_registrations_need_update) {
598 spin_unlock_bh(&rdev->mgmt_registrations_lock);
599 return;
600 }
601
602 rcu_read_lock();
603 list_for_each_entry_rcu(tmp, &rdev->wiphy.wdev_list, list) {
604 list_for_each_entry(reg, &tmp->mgmt_registrations, list) {
605 u32 mask = BIT(le16_to_cpu(reg->frame_type) >> 4);
606 u32 mcast_mask = 0;
607
608 if (reg->multicast_rx)
609 mcast_mask = mask;
610
611 upd.global_stypes |= mask;
612 upd.global_mcast_stypes |= mcast_mask;
613
614 if (tmp == wdev) {
615 upd.interface_stypes |= mask;
616 upd.interface_mcast_stypes |= mcast_mask;
617 }
618 }
619 }
620 rcu_read_unlock();
621
622 wdev->mgmt_registrations_need_update = 0;
623 spin_unlock_bh(&rdev->mgmt_registrations_lock);
624
625 rdev_update_mgmt_frame_registrations(rdev, wdev, &upd);
626 }
627
cfg80211_mgmt_registrations_update_wk(struct work_struct * wk)628 void cfg80211_mgmt_registrations_update_wk(struct work_struct *wk)
629 {
630 struct cfg80211_registered_device *rdev;
631 struct wireless_dev *wdev;
632
633 rdev = container_of(wk, struct cfg80211_registered_device,
634 mgmt_registrations_update_wk);
635
636 wiphy_lock(&rdev->wiphy);
637 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
638 cfg80211_mgmt_registrations_update(wdev);
639 wiphy_unlock(&rdev->wiphy);
640 }
641
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)642 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
643 u16 frame_type, const u8 *match_data,
644 int match_len, bool multicast_rx,
645 struct netlink_ext_ack *extack)
646 {
647 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
648 struct cfg80211_mgmt_registration *reg, *nreg;
649 int err = 0;
650 u16 mgmt_type;
651 bool update_multicast = false;
652
653 if (!wdev->wiphy->mgmt_stypes)
654 return -EOPNOTSUPP;
655
656 if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT) {
657 NL_SET_ERR_MSG(extack, "frame type not management");
658 return -EINVAL;
659 }
660
661 if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) {
662 NL_SET_ERR_MSG(extack, "Invalid frame type");
663 return -EINVAL;
664 }
665
666 mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
667 if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type))) {
668 NL_SET_ERR_MSG(extack,
669 "Registration to specific type not supported");
670 return -EINVAL;
671 }
672
673 /*
674 * To support Pre Association Security Negotiation (PASN), registration
675 * for authentication frames should be supported. However, as some
676 * versions of the user space daemons wrongly register to all types of
677 * authentication frames (which might result in unexpected behavior)
678 * allow such registration if the request is for a specific
679 * authentication algorithm number.
680 */
681 if (wdev->iftype == NL80211_IFTYPE_STATION &&
682 (frame_type & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_AUTH &&
683 !(match_data && match_len >= 2)) {
684 NL_SET_ERR_MSG(extack,
685 "Authentication algorithm number required");
686 return -EINVAL;
687 }
688
689 nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
690 if (!nreg)
691 return -ENOMEM;
692
693 spin_lock_bh(&rdev->mgmt_registrations_lock);
694
695 list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
696 int mlen = min(match_len, reg->match_len);
697
698 if (frame_type != le16_to_cpu(reg->frame_type))
699 continue;
700
701 if (memcmp(reg->match, match_data, mlen) == 0) {
702 if (reg->multicast_rx != multicast_rx) {
703 update_multicast = true;
704 reg->multicast_rx = multicast_rx;
705 break;
706 }
707 NL_SET_ERR_MSG(extack, "Match already configured");
708 err = -EALREADY;
709 break;
710 }
711 }
712
713 if (err)
714 goto out;
715
716 if (update_multicast) {
717 kfree(nreg);
718 } else {
719 memcpy(nreg->match, match_data, match_len);
720 nreg->match_len = match_len;
721 nreg->nlportid = snd_portid;
722 nreg->frame_type = cpu_to_le16(frame_type);
723 nreg->wdev = wdev;
724 nreg->multicast_rx = multicast_rx;
725 list_add(&nreg->list, &wdev->mgmt_registrations);
726 }
727 wdev->mgmt_registrations_need_update = 1;
728 spin_unlock_bh(&rdev->mgmt_registrations_lock);
729
730 cfg80211_mgmt_registrations_update(wdev);
731
732 return 0;
733
734 out:
735 kfree(nreg);
736 spin_unlock_bh(&rdev->mgmt_registrations_lock);
737
738 return err;
739 }
740
cfg80211_mlme_unregister_socket(struct wireless_dev * wdev,u32 nlportid)741 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
742 {
743 struct wiphy *wiphy = wdev->wiphy;
744 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
745 struct cfg80211_mgmt_registration *reg, *tmp;
746
747 spin_lock_bh(&rdev->mgmt_registrations_lock);
748
749 list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
750 if (reg->nlportid != nlportid)
751 continue;
752
753 list_del(®->list);
754 kfree(reg);
755
756 wdev->mgmt_registrations_need_update = 1;
757 schedule_work(&rdev->mgmt_registrations_update_wk);
758 }
759
760 spin_unlock_bh(&rdev->mgmt_registrations_lock);
761
762 if (nlportid && rdev->crit_proto_nlportid == nlportid) {
763 rdev->crit_proto_nlportid = 0;
764 rdev_crit_proto_stop(rdev, wdev);
765 }
766
767 if (nlportid == wdev->ap_unexpected_nlportid)
768 wdev->ap_unexpected_nlportid = 0;
769 }
770
cfg80211_mlme_purge_registrations(struct wireless_dev * wdev)771 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
772 {
773 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
774 struct cfg80211_mgmt_registration *reg, *tmp;
775
776 spin_lock_bh(&rdev->mgmt_registrations_lock);
777 list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
778 list_del(®->list);
779 kfree(reg);
780 }
781 wdev->mgmt_registrations_need_update = 1;
782 spin_unlock_bh(&rdev->mgmt_registrations_lock);
783
784 cfg80211_mgmt_registrations_update(wdev);
785 }
786
cfg80211_allowed_address(struct wireless_dev * wdev,const u8 * addr)787 static bool cfg80211_allowed_address(struct wireless_dev *wdev, const u8 *addr)
788 {
789 int i;
790
791 for_each_valid_link(wdev, i) {
792 if (ether_addr_equal(addr, wdev->links[i].addr))
793 return true;
794 }
795
796 return ether_addr_equal(addr, wdev_address(wdev));
797 }
798
cfg80211_allowed_random_address(struct wireless_dev * wdev,const struct ieee80211_mgmt * mgmt)799 static bool cfg80211_allowed_random_address(struct wireless_dev *wdev,
800 const struct ieee80211_mgmt *mgmt)
801 {
802 if (ieee80211_is_auth(mgmt->frame_control) ||
803 ieee80211_is_deauth(mgmt->frame_control)) {
804 /* Allow random TA to be used with authentication and
805 * deauthentication frames if the driver has indicated support.
806 */
807 if (wiphy_ext_feature_isset(
808 wdev->wiphy,
809 NL80211_EXT_FEATURE_AUTH_AND_DEAUTH_RANDOM_TA))
810 return true;
811 } else if (ieee80211_is_action(mgmt->frame_control) &&
812 mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
813 /* Allow random TA to be used with Public Action frames if the
814 * driver has indicated support.
815 */
816 if (!wdev->connected &&
817 wiphy_ext_feature_isset(
818 wdev->wiphy,
819 NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA))
820 return true;
821
822 if (wdev->connected &&
823 wiphy_ext_feature_isset(
824 wdev->wiphy,
825 NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED))
826 return true;
827 }
828
829 return false;
830 }
831
cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,struct cfg80211_mgmt_tx_params * params,u64 * cookie)832 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
833 struct wireless_dev *wdev,
834 struct cfg80211_mgmt_tx_params *params, u64 *cookie)
835 {
836 const struct ieee80211_mgmt *mgmt;
837 u16 stype;
838
839 lockdep_assert_wiphy(&rdev->wiphy);
840
841 if (!wdev->wiphy->mgmt_stypes)
842 return -EOPNOTSUPP;
843
844 if (!rdev->ops->mgmt_tx)
845 return -EOPNOTSUPP;
846
847 if (params->len < 24 + 1)
848 return -EINVAL;
849
850 mgmt = (const struct ieee80211_mgmt *)params->buf;
851
852 if (!ieee80211_is_mgmt(mgmt->frame_control))
853 return -EINVAL;
854
855 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
856 if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
857 return -EINVAL;
858
859 if (ieee80211_is_action(mgmt->frame_control) &&
860 mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
861 int err = 0;
862
863 switch (wdev->iftype) {
864 case NL80211_IFTYPE_ADHOC:
865 /*
866 * check for IBSS DA must be done by driver as
867 * cfg80211 doesn't track the stations
868 */
869 if (!wdev->u.ibss.current_bss ||
870 !ether_addr_equal(wdev->u.ibss.current_bss->pub.bssid,
871 mgmt->bssid)) {
872 err = -ENOTCONN;
873 break;
874 }
875 break;
876 case NL80211_IFTYPE_STATION:
877 case NL80211_IFTYPE_P2P_CLIENT:
878 if (!wdev->connected) {
879 err = -ENOTCONN;
880 break;
881 }
882
883 /* FIXME: MLD may address this differently */
884
885 if (!ether_addr_equal(wdev->u.client.connected_addr,
886 mgmt->bssid)) {
887 err = -ENOTCONN;
888 break;
889 }
890
891 /* for station, check that DA is the AP */
892 if (!ether_addr_equal(wdev->u.client.connected_addr,
893 mgmt->da)) {
894 err = -ENOTCONN;
895 break;
896 }
897 break;
898 case NL80211_IFTYPE_AP:
899 case NL80211_IFTYPE_P2P_GO:
900 case NL80211_IFTYPE_AP_VLAN:
901 if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)) &&
902 (params->link_id < 0 ||
903 !ether_addr_equal(mgmt->bssid,
904 wdev->links[params->link_id].addr)))
905 err = -EINVAL;
906 break;
907 case NL80211_IFTYPE_MESH_POINT:
908 if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
909 err = -EINVAL;
910 break;
911 }
912 /*
913 * check for mesh DA must be done by driver as
914 * cfg80211 doesn't track the stations
915 */
916 break;
917 case NL80211_IFTYPE_P2P_DEVICE:
918 /*
919 * fall through, P2P device only supports
920 * public action frames
921 */
922 case NL80211_IFTYPE_NAN:
923 default:
924 err = -EOPNOTSUPP;
925 break;
926 }
927
928 if (err)
929 return err;
930 }
931
932 if (!cfg80211_allowed_address(wdev, mgmt->sa) &&
933 !cfg80211_allowed_random_address(wdev, mgmt))
934 return -EINVAL;
935
936 /* Transmit the management frame as requested by user space */
937 return rdev_mgmt_tx(rdev, wdev, params, cookie);
938 }
939
cfg80211_rx_mgmt_ext(struct wireless_dev * wdev,struct cfg80211_rx_info * info)940 bool cfg80211_rx_mgmt_ext(struct wireless_dev *wdev,
941 struct cfg80211_rx_info *info)
942 {
943 struct wiphy *wiphy = wdev->wiphy;
944 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
945 struct cfg80211_mgmt_registration *reg;
946 const struct ieee80211_txrx_stypes *stypes =
947 &wiphy->mgmt_stypes[wdev->iftype];
948 struct ieee80211_mgmt *mgmt = (void *)info->buf;
949 const u8 *data;
950 int data_len;
951 bool result = false;
952 __le16 ftype = mgmt->frame_control &
953 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
954 u16 stype;
955
956 trace_cfg80211_rx_mgmt(wdev, info);
957 stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
958
959 if (!(stypes->rx & BIT(stype))) {
960 trace_cfg80211_return_bool(false);
961 return false;
962 }
963
964 data = info->buf + ieee80211_hdrlen(mgmt->frame_control);
965 data_len = info->len - ieee80211_hdrlen(mgmt->frame_control);
966
967 spin_lock_bh(&rdev->mgmt_registrations_lock);
968
969 list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
970 if (reg->frame_type != ftype)
971 continue;
972
973 if (reg->match_len > data_len)
974 continue;
975
976 if (memcmp(reg->match, data, reg->match_len))
977 continue;
978
979 /* found match! */
980
981 /* Indicate the received Action frame to user space */
982 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid, info,
983 GFP_ATOMIC))
984 continue;
985
986 result = true;
987 break;
988 }
989
990 spin_unlock_bh(&rdev->mgmt_registrations_lock);
991
992 trace_cfg80211_return_bool(result);
993 return result;
994 }
995 EXPORT_SYMBOL(cfg80211_rx_mgmt_ext);
996
cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device * rdev)997 void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev)
998 {
999 cancel_delayed_work(&rdev->dfs_update_channels_wk);
1000 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0);
1001 }
1002
cfg80211_dfs_channels_update_work(struct work_struct * work)1003 void cfg80211_dfs_channels_update_work(struct work_struct *work)
1004 {
1005 struct delayed_work *delayed_work = to_delayed_work(work);
1006 struct cfg80211_registered_device *rdev;
1007 struct cfg80211_chan_def chandef;
1008 struct ieee80211_supported_band *sband;
1009 struct ieee80211_channel *c;
1010 struct wiphy *wiphy;
1011 bool check_again = false;
1012 unsigned long timeout, next_time = 0;
1013 unsigned long time_dfs_update;
1014 enum nl80211_radar_event radar_event;
1015 int bandid, i;
1016
1017 rdev = container_of(delayed_work, struct cfg80211_registered_device,
1018 dfs_update_channels_wk);
1019 wiphy = &rdev->wiphy;
1020
1021 rtnl_lock();
1022 for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
1023 sband = wiphy->bands[bandid];
1024 if (!sband)
1025 continue;
1026
1027 for (i = 0; i < sband->n_channels; i++) {
1028 c = &sband->channels[i];
1029
1030 if (!(c->flags & IEEE80211_CHAN_RADAR))
1031 continue;
1032
1033 if (c->dfs_state != NL80211_DFS_UNAVAILABLE &&
1034 c->dfs_state != NL80211_DFS_AVAILABLE)
1035 continue;
1036
1037 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) {
1038 time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS;
1039 radar_event = NL80211_RADAR_NOP_FINISHED;
1040 } else {
1041 if (regulatory_pre_cac_allowed(wiphy) ||
1042 cfg80211_any_wiphy_oper_chan(wiphy, c))
1043 continue;
1044
1045 time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS;
1046 radar_event = NL80211_RADAR_PRE_CAC_EXPIRED;
1047 }
1048
1049 timeout = c->dfs_state_entered +
1050 msecs_to_jiffies(time_dfs_update);
1051
1052 if (time_after_eq(jiffies, timeout)) {
1053 c->dfs_state = NL80211_DFS_USABLE;
1054 c->dfs_state_entered = jiffies;
1055
1056 cfg80211_chandef_create(&chandef, c,
1057 NL80211_CHAN_NO_HT);
1058
1059 nl80211_radar_notify(rdev, &chandef,
1060 radar_event, NULL,
1061 GFP_ATOMIC);
1062
1063 regulatory_propagate_dfs_state(wiphy, &chandef,
1064 c->dfs_state,
1065 radar_event);
1066 continue;
1067 }
1068
1069 if (!check_again)
1070 next_time = timeout - jiffies;
1071 else
1072 next_time = min(next_time, timeout - jiffies);
1073 check_again = true;
1074 }
1075 }
1076 rtnl_unlock();
1077
1078 /* reschedule if there are other channels waiting to be cleared again */
1079 if (check_again)
1080 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
1081 next_time);
1082 }
1083
1084
__cfg80211_radar_event(struct wiphy * wiphy,struct cfg80211_chan_def * chandef,bool offchan,gfp_t gfp)1085 void __cfg80211_radar_event(struct wiphy *wiphy,
1086 struct cfg80211_chan_def *chandef,
1087 bool offchan, gfp_t gfp)
1088 {
1089 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1090
1091 trace_cfg80211_radar_event(wiphy, chandef, offchan);
1092
1093 /* only set the chandef supplied channel to unavailable, in
1094 * case the radar is detected on only one of multiple channels
1095 * spanned by the chandef.
1096 */
1097 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
1098
1099 if (offchan)
1100 queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
1101
1102 cfg80211_sched_dfs_chan_update(rdev);
1103
1104 nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
1105
1106 memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def));
1107 queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);
1108 }
1109 EXPORT_SYMBOL(__cfg80211_radar_event);
1110
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)1111 void cfg80211_cac_event(struct net_device *netdev,
1112 const struct cfg80211_chan_def *chandef,
1113 enum nl80211_radar_event event, gfp_t gfp,
1114 unsigned int link_id)
1115 {
1116 struct wireless_dev *wdev = netdev->ieee80211_ptr;
1117 struct wiphy *wiphy = wdev->wiphy;
1118 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1119 unsigned long timeout;
1120
1121 if (WARN_ON(wdev->valid_links &&
1122 !(wdev->valid_links & BIT(link_id))))
1123 return;
1124
1125 trace_cfg80211_cac_event(netdev, event, link_id);
1126
1127 if (WARN_ON(!wdev->links[link_id].cac_started &&
1128 event != NL80211_RADAR_CAC_STARTED))
1129 return;
1130
1131 switch (event) {
1132 case NL80211_RADAR_CAC_FINISHED:
1133 timeout = wdev->links[link_id].cac_start_time +
1134 msecs_to_jiffies(wdev->links[link_id].cac_time_ms);
1135 WARN_ON(!time_after_eq(jiffies, timeout));
1136 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
1137 memcpy(&rdev->cac_done_chandef, chandef,
1138 sizeof(struct cfg80211_chan_def));
1139 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
1140 cfg80211_sched_dfs_chan_update(rdev);
1141 fallthrough;
1142 case NL80211_RADAR_CAC_ABORTED:
1143 wdev->links[link_id].cac_started = false;
1144 break;
1145 case NL80211_RADAR_CAC_STARTED:
1146 wdev->links[link_id].cac_started = true;
1147 break;
1148 default:
1149 WARN_ON(1);
1150 return;
1151 }
1152
1153 nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
1154 }
1155 EXPORT_SYMBOL(cfg80211_cac_event);
1156
1157 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)1158 __cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
1159 struct wireless_dev *wdev,
1160 const struct cfg80211_chan_def *chandef,
1161 enum nl80211_radar_event event)
1162 {
1163 struct wiphy *wiphy = &rdev->wiphy;
1164 struct net_device *netdev;
1165
1166 lockdep_assert_wiphy(&rdev->wiphy);
1167
1168 if (!cfg80211_chandef_valid(chandef))
1169 return;
1170
1171 if (!rdev->background_radar_wdev)
1172 return;
1173
1174 switch (event) {
1175 case NL80211_RADAR_CAC_FINISHED:
1176 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
1177 memcpy(&rdev->cac_done_chandef, chandef, sizeof(*chandef));
1178 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
1179 cfg80211_sched_dfs_chan_update(rdev);
1180 wdev = rdev->background_radar_wdev;
1181 break;
1182 case NL80211_RADAR_CAC_ABORTED:
1183 if (!cancel_delayed_work(&rdev->background_cac_done_wk))
1184 return;
1185 wdev = rdev->background_radar_wdev;
1186 break;
1187 case NL80211_RADAR_CAC_STARTED:
1188 break;
1189 default:
1190 return;
1191 }
1192
1193 netdev = wdev ? wdev->netdev : NULL;
1194 nl80211_radar_notify(rdev, chandef, event, netdev, GFP_KERNEL);
1195 }
1196
1197 static void
cfg80211_background_cac_event(struct cfg80211_registered_device * rdev,const struct cfg80211_chan_def * chandef,enum nl80211_radar_event event)1198 cfg80211_background_cac_event(struct cfg80211_registered_device *rdev,
1199 const struct cfg80211_chan_def *chandef,
1200 enum nl80211_radar_event event)
1201 {
1202 wiphy_lock(&rdev->wiphy);
1203 __cfg80211_background_cac_event(rdev, rdev->background_radar_wdev,
1204 chandef, event);
1205 wiphy_unlock(&rdev->wiphy);
1206 }
1207
cfg80211_background_cac_done_wk(struct work_struct * work)1208 void cfg80211_background_cac_done_wk(struct work_struct *work)
1209 {
1210 struct delayed_work *delayed_work = to_delayed_work(work);
1211 struct cfg80211_registered_device *rdev;
1212
1213 rdev = container_of(delayed_work, struct cfg80211_registered_device,
1214 background_cac_done_wk);
1215 cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
1216 NL80211_RADAR_CAC_FINISHED);
1217 }
1218
cfg80211_background_cac_abort_wk(struct work_struct * work)1219 void cfg80211_background_cac_abort_wk(struct work_struct *work)
1220 {
1221 struct cfg80211_registered_device *rdev;
1222
1223 rdev = container_of(work, struct cfg80211_registered_device,
1224 background_cac_abort_wk);
1225 cfg80211_background_cac_event(rdev, &rdev->background_radar_chandef,
1226 NL80211_RADAR_CAC_ABORTED);
1227 }
1228
cfg80211_background_cac_abort(struct wiphy * wiphy)1229 void cfg80211_background_cac_abort(struct wiphy *wiphy)
1230 {
1231 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1232
1233 queue_work(cfg80211_wq, &rdev->background_cac_abort_wk);
1234 }
1235 EXPORT_SYMBOL(cfg80211_background_cac_abort);
1236
1237 int
cfg80211_start_background_radar_detection(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,struct cfg80211_chan_def * chandef)1238 cfg80211_start_background_radar_detection(struct cfg80211_registered_device *rdev,
1239 struct wireless_dev *wdev,
1240 struct cfg80211_chan_def *chandef)
1241 {
1242 unsigned int cac_time_ms;
1243 int err;
1244
1245 lockdep_assert_wiphy(&rdev->wiphy);
1246
1247 if (!wiphy_ext_feature_isset(&rdev->wiphy,
1248 NL80211_EXT_FEATURE_RADAR_BACKGROUND))
1249 return -EOPNOTSUPP;
1250
1251 /* Offchannel chain already locked by another wdev */
1252 if (rdev->background_radar_wdev && rdev->background_radar_wdev != wdev)
1253 return -EBUSY;
1254
1255 /* CAC already in progress on the offchannel chain */
1256 if (rdev->background_radar_wdev == wdev &&
1257 delayed_work_pending(&rdev->background_cac_done_wk))
1258 return -EBUSY;
1259
1260 err = rdev_set_radar_background(rdev, chandef);
1261 if (err)
1262 return err;
1263
1264 cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, chandef);
1265 if (!cac_time_ms)
1266 cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
1267
1268 rdev->background_radar_chandef = *chandef;
1269 rdev->background_radar_wdev = wdev; /* Get offchain ownership */
1270
1271 __cfg80211_background_cac_event(rdev, wdev, chandef,
1272 NL80211_RADAR_CAC_STARTED);
1273 queue_delayed_work(cfg80211_wq, &rdev->background_cac_done_wk,
1274 msecs_to_jiffies(cac_time_ms));
1275
1276 return 0;
1277 }
1278
cfg80211_stop_background_radar_detection(struct wireless_dev * wdev)1279 void cfg80211_stop_background_radar_detection(struct wireless_dev *wdev)
1280 {
1281 struct wiphy *wiphy = wdev->wiphy;
1282 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1283
1284 lockdep_assert_wiphy(wiphy);
1285
1286 if (wdev != rdev->background_radar_wdev)
1287 return;
1288
1289 rdev_set_radar_background(rdev, NULL);
1290 rdev->background_radar_wdev = NULL; /* Release offchain ownership */
1291
1292 __cfg80211_background_cac_event(rdev, wdev,
1293 &rdev->background_radar_chandef,
1294 NL80211_RADAR_CAC_ABORTED);
1295 }
1296