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