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 */
8
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/etherdevice.h>
12 #include <linux/netdevice.h>
13 #include <linux/nl80211.h>
14 #include <linux/slab.h>
15 #include <linux/wireless.h>
16 #include <net/cfg80211.h>
17 #include <net/iw_handler.h>
18 #include "core.h"
19 #include "nl80211.h"
20 #include "rdev-ops.h"
21
22
cfg80211_rx_assoc_resp(struct net_device * dev,struct cfg80211_bss * bss,const u8 * buf,size_t len,int uapsd_queues)23 void cfg80211_rx_assoc_resp(struct net_device *dev, struct cfg80211_bss *bss,
24 const u8 *buf, size_t len, int uapsd_queues)
25 {
26 struct wireless_dev *wdev = dev->ieee80211_ptr;
27 struct wiphy *wiphy = wdev->wiphy;
28 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
29 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
30 struct cfg80211_connect_resp_params cr;
31
32 memset(&cr, 0, sizeof(cr));
33 cr.status = (int)le16_to_cpu(mgmt->u.assoc_resp.status_code);
34 cr.bssid = mgmt->bssid;
35 cr.bss = bss;
36 cr.resp_ie = mgmt->u.assoc_resp.variable;
37 cr.resp_ie_len =
38 len - offsetof(struct ieee80211_mgmt, u.assoc_resp.variable);
39 cr.timeout_reason = NL80211_TIMEOUT_UNSPECIFIED;
40
41 trace_cfg80211_send_rx_assoc(dev, bss);
42
43 /*
44 * This is a bit of a hack, we don't notify userspace of
45 * a (re-)association reply if we tried to send a reassoc
46 * and got a reject -- we only try again with an assoc
47 * frame instead of reassoc.
48 */
49 if (cfg80211_sme_rx_assoc_resp(wdev, cr.status)) {
50 cfg80211_unhold_bss(bss_from_pub(bss));
51 cfg80211_put_bss(wiphy, bss);
52 return;
53 }
54
55 nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL, uapsd_queues);
56 /* update current_bss etc., consumes the bss reference */
57 __cfg80211_connect_result(dev, &cr, cr.status == WLAN_STATUS_SUCCESS);
58 }
59 EXPORT_SYMBOL(cfg80211_rx_assoc_resp);
60
cfg80211_process_auth(struct wireless_dev * wdev,const u8 * buf,size_t len)61 static void cfg80211_process_auth(struct wireless_dev *wdev,
62 const u8 *buf, size_t len)
63 {
64 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
65
66 nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
67 cfg80211_sme_rx_auth(wdev, buf, len);
68 }
69
cfg80211_process_deauth(struct wireless_dev * wdev,const u8 * buf,size_t len)70 static void cfg80211_process_deauth(struct wireless_dev *wdev,
71 const u8 *buf, size_t len)
72 {
73 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
74 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
75 const u8 *bssid = mgmt->bssid;
76 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
77 bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
78
79 nl80211_send_deauth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
80
81 if (!wdev->current_bss ||
82 !ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
83 return;
84
85 __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
86 cfg80211_sme_deauth(wdev);
87 }
88
cfg80211_process_disassoc(struct wireless_dev * wdev,const u8 * buf,size_t len)89 static void cfg80211_process_disassoc(struct wireless_dev *wdev,
90 const u8 *buf, size_t len)
91 {
92 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
93 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
94 const u8 *bssid = mgmt->bssid;
95 u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
96 bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
97
98 nl80211_send_disassoc(rdev, wdev->netdev, buf, len, GFP_KERNEL);
99
100 if (WARN_ON(!wdev->current_bss ||
101 !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
102 return;
103
104 __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
105 cfg80211_sme_disassoc(wdev);
106 }
107
cfg80211_rx_mlme_mgmt(struct net_device * dev,const u8 * buf,size_t len)108 void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
109 {
110 struct wireless_dev *wdev = dev->ieee80211_ptr;
111 struct ieee80211_mgmt *mgmt = (void *)buf;
112
113 ASSERT_WDEV_LOCK(wdev);
114
115 trace_cfg80211_rx_mlme_mgmt(dev, buf, len);
116
117 if (WARN_ON(len < 2))
118 return;
119
120 if (ieee80211_is_auth(mgmt->frame_control))
121 cfg80211_process_auth(wdev, buf, len);
122 else if (ieee80211_is_deauth(mgmt->frame_control))
123 cfg80211_process_deauth(wdev, buf, len);
124 else if (ieee80211_is_disassoc(mgmt->frame_control))
125 cfg80211_process_disassoc(wdev, buf, len);
126 }
127 EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt);
128
cfg80211_auth_timeout(struct net_device * dev,const u8 * addr)129 void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr)
130 {
131 struct wireless_dev *wdev = dev->ieee80211_ptr;
132 struct wiphy *wiphy = wdev->wiphy;
133 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
134
135 trace_cfg80211_send_auth_timeout(dev, addr);
136
137 nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
138 cfg80211_sme_auth_timeout(wdev);
139 }
140 EXPORT_SYMBOL(cfg80211_auth_timeout);
141
cfg80211_assoc_timeout(struct net_device * dev,struct cfg80211_bss * bss)142 void cfg80211_assoc_timeout(struct net_device *dev, struct cfg80211_bss *bss)
143 {
144 struct wireless_dev *wdev = dev->ieee80211_ptr;
145 struct wiphy *wiphy = wdev->wiphy;
146 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
147
148 trace_cfg80211_send_assoc_timeout(dev, bss->bssid);
149
150 nl80211_send_assoc_timeout(rdev, dev, bss->bssid, GFP_KERNEL);
151 cfg80211_sme_assoc_timeout(wdev);
152
153 cfg80211_unhold_bss(bss_from_pub(bss));
154 cfg80211_put_bss(wiphy, bss);
155 }
156 EXPORT_SYMBOL(cfg80211_assoc_timeout);
157
cfg80211_abandon_assoc(struct net_device * dev,struct cfg80211_bss * bss)158 void cfg80211_abandon_assoc(struct net_device *dev, struct cfg80211_bss *bss)
159 {
160 struct wireless_dev *wdev = dev->ieee80211_ptr;
161 struct wiphy *wiphy = wdev->wiphy;
162
163 cfg80211_sme_abandon_assoc(wdev);
164
165 cfg80211_unhold_bss(bss_from_pub(bss));
166 cfg80211_put_bss(wiphy, bss);
167 }
168 EXPORT_SYMBOL(cfg80211_abandon_assoc);
169
cfg80211_tx_mlme_mgmt(struct net_device * dev,const u8 * buf,size_t len)170 void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
171 {
172 struct wireless_dev *wdev = dev->ieee80211_ptr;
173 struct ieee80211_mgmt *mgmt = (void *)buf;
174
175 ASSERT_WDEV_LOCK(wdev);
176
177 trace_cfg80211_tx_mlme_mgmt(dev, buf, len);
178
179 if (WARN_ON(len < 2))
180 return;
181
182 if (ieee80211_is_deauth(mgmt->frame_control))
183 cfg80211_process_deauth(wdev, buf, len);
184 else
185 cfg80211_process_disassoc(wdev, buf, len);
186 }
187 EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt);
188
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)189 void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
190 enum nl80211_key_type key_type, int key_id,
191 const u8 *tsc, gfp_t gfp)
192 {
193 struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
194 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
195 #ifdef CONFIG_CFG80211_WEXT
196 union iwreq_data wrqu;
197 char *buf = kmalloc(128, gfp);
198
199 if (buf) {
200 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
201 "keyid=%d %scast addr=%pM)", key_id,
202 key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
203 addr);
204 memset(&wrqu, 0, sizeof(wrqu));
205 wrqu.data.length = strlen(buf);
206 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
207 kfree(buf);
208 }
209 #endif
210
211 trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
212 nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
213 }
214 EXPORT_SYMBOL(cfg80211_michael_mic_failure);
215
216 /* some MLME handling for userspace SME */
cfg80211_mlme_auth(struct cfg80211_registered_device * rdev,struct net_device * dev,struct ieee80211_channel * chan,enum nl80211_auth_type auth_type,const u8 * bssid,const u8 * ssid,int ssid_len,const u8 * ie,int ie_len,const u8 * key,int key_len,int key_idx,const u8 * auth_data,int auth_data_len)217 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
218 struct net_device *dev,
219 struct ieee80211_channel *chan,
220 enum nl80211_auth_type auth_type,
221 const u8 *bssid,
222 const u8 *ssid, int ssid_len,
223 const u8 *ie, int ie_len,
224 const u8 *key, int key_len, int key_idx,
225 const u8 *auth_data, int auth_data_len)
226 {
227 struct wireless_dev *wdev = dev->ieee80211_ptr;
228 struct cfg80211_auth_request req = {
229 .ie = ie,
230 .ie_len = ie_len,
231 .auth_data = auth_data,
232 .auth_data_len = auth_data_len,
233 .auth_type = auth_type,
234 .key = key,
235 .key_len = key_len,
236 .key_idx = key_idx,
237 };
238 int err;
239
240 ASSERT_WDEV_LOCK(wdev);
241
242 if (auth_type == NL80211_AUTHTYPE_SHARED_KEY)
243 if (!key || !key_len || key_idx < 0 || key_idx > 3)
244 return -EINVAL;
245
246 if (wdev->current_bss &&
247 ether_addr_equal(bssid, wdev->current_bss->pub.bssid))
248 return -EALREADY;
249
250 req.bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
251 IEEE80211_BSS_TYPE_ESS,
252 IEEE80211_PRIVACY_ANY);
253 if (!req.bss)
254 return -ENOENT;
255
256 err = rdev_auth(rdev, dev, &req);
257
258 cfg80211_put_bss(&rdev->wiphy, req.bss);
259 return err;
260 }
261
262 /* 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)263 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
264 const struct ieee80211_ht_cap *ht_capa_mask)
265 {
266 int i;
267 u8 *p1, *p2;
268 if (!ht_capa_mask) {
269 memset(ht_capa, 0, sizeof(*ht_capa));
270 return;
271 }
272
273 p1 = (u8*)(ht_capa);
274 p2 = (u8*)(ht_capa_mask);
275 for (i = 0; i<sizeof(*ht_capa); i++)
276 p1[i] &= p2[i];
277 }
278
279 /* Do a logical ht_capa &= ht_capa_mask. */
cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap * vht_capa,const struct ieee80211_vht_cap * vht_capa_mask)280 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
281 const struct ieee80211_vht_cap *vht_capa_mask)
282 {
283 int i;
284 u8 *p1, *p2;
285 if (!vht_capa_mask) {
286 memset(vht_capa, 0, sizeof(*vht_capa));
287 return;
288 }
289
290 p1 = (u8*)(vht_capa);
291 p2 = (u8*)(vht_capa_mask);
292 for (i = 0; i < sizeof(*vht_capa); i++)
293 p1[i] &= p2[i];
294 }
295
cfg80211_mlme_assoc(struct cfg80211_registered_device * rdev,struct net_device * dev,struct ieee80211_channel * chan,const u8 * bssid,const u8 * ssid,int ssid_len,struct cfg80211_assoc_request * req)296 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
297 struct net_device *dev,
298 struct ieee80211_channel *chan,
299 const u8 *bssid,
300 const u8 *ssid, int ssid_len,
301 struct cfg80211_assoc_request *req)
302 {
303 struct wireless_dev *wdev = dev->ieee80211_ptr;
304 int err;
305
306 ASSERT_WDEV_LOCK(wdev);
307
308 if (wdev->current_bss &&
309 (!req->prev_bssid || !ether_addr_equal(wdev->current_bss->pub.bssid,
310 req->prev_bssid)))
311 return -EALREADY;
312
313 cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
314 rdev->wiphy.ht_capa_mod_mask);
315 cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
316 rdev->wiphy.vht_capa_mod_mask);
317
318 req->bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
319 IEEE80211_BSS_TYPE_ESS,
320 IEEE80211_PRIVACY_ANY);
321 if (!req->bss)
322 return -ENOENT;
323
324 err = rdev_assoc(rdev, dev, req);
325 if (!err)
326 cfg80211_hold_bss(bss_from_pub(req->bss));
327 else
328 cfg80211_put_bss(&rdev->wiphy, req->bss);
329
330 return err;
331 }
332
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)333 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
334 struct net_device *dev, const u8 *bssid,
335 const u8 *ie, int ie_len, u16 reason,
336 bool local_state_change)
337 {
338 struct wireless_dev *wdev = dev->ieee80211_ptr;
339 struct cfg80211_deauth_request req = {
340 .bssid = bssid,
341 .reason_code = reason,
342 .ie = ie,
343 .ie_len = ie_len,
344 .local_state_change = local_state_change,
345 };
346
347 ASSERT_WDEV_LOCK(wdev);
348
349 if (local_state_change &&
350 (!wdev->current_bss ||
351 !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
352 return 0;
353
354 if (ether_addr_equal(wdev->disconnect_bssid, bssid) ||
355 (wdev->current_bss &&
356 ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
357 wdev->conn_owner_nlportid = 0;
358
359 return rdev_deauth(rdev, dev, &req);
360 }
361
cfg80211_mlme_disassoc(struct cfg80211_registered_device * rdev,struct net_device * dev,const u8 * bssid,const u8 * ie,int ie_len,u16 reason,bool local_state_change)362 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
363 struct net_device *dev, const u8 *bssid,
364 const u8 *ie, int ie_len, u16 reason,
365 bool local_state_change)
366 {
367 struct wireless_dev *wdev = dev->ieee80211_ptr;
368 struct cfg80211_disassoc_request req = {
369 .reason_code = reason,
370 .local_state_change = local_state_change,
371 .ie = ie,
372 .ie_len = ie_len,
373 };
374 int err;
375
376 ASSERT_WDEV_LOCK(wdev);
377
378 if (!wdev->current_bss)
379 return -ENOTCONN;
380
381 if (ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
382 req.bss = &wdev->current_bss->pub;
383 else
384 return -ENOTCONN;
385
386 err = rdev_disassoc(rdev, dev, &req);
387 if (err)
388 return err;
389
390 /* driver should have reported the disassoc */
391 WARN_ON(wdev->current_bss);
392 return 0;
393 }
394
cfg80211_mlme_down(struct cfg80211_registered_device * rdev,struct net_device * dev)395 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
396 struct net_device *dev)
397 {
398 struct wireless_dev *wdev = dev->ieee80211_ptr;
399 u8 bssid[ETH_ALEN];
400
401 ASSERT_WDEV_LOCK(wdev);
402
403 if (!rdev->ops->deauth)
404 return;
405
406 if (!wdev->current_bss)
407 return;
408
409 memcpy(bssid, wdev->current_bss->pub.bssid, ETH_ALEN);
410 cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
411 WLAN_REASON_DEAUTH_LEAVING, false);
412 }
413
414 struct cfg80211_mgmt_registration {
415 struct list_head list;
416 struct wireless_dev *wdev;
417
418 u32 nlportid;
419
420 int match_len;
421
422 __le16 frame_type;
423
424 u8 match[];
425 };
426
427 static void
cfg80211_process_mlme_unregistrations(struct cfg80211_registered_device * rdev)428 cfg80211_process_mlme_unregistrations(struct cfg80211_registered_device *rdev)
429 {
430 struct cfg80211_mgmt_registration *reg;
431
432 ASSERT_RTNL();
433
434 spin_lock_bh(&rdev->mlme_unreg_lock);
435 while ((reg = list_first_entry_or_null(&rdev->mlme_unreg,
436 struct cfg80211_mgmt_registration,
437 list))) {
438 list_del(®->list);
439 spin_unlock_bh(&rdev->mlme_unreg_lock);
440
441 if (rdev->ops->mgmt_frame_register) {
442 u16 frame_type = le16_to_cpu(reg->frame_type);
443
444 rdev_mgmt_frame_register(rdev, reg->wdev,
445 frame_type, false);
446 }
447
448 kfree(reg);
449
450 spin_lock_bh(&rdev->mlme_unreg_lock);
451 }
452 spin_unlock_bh(&rdev->mlme_unreg_lock);
453 }
454
cfg80211_mlme_unreg_wk(struct work_struct * wk)455 void cfg80211_mlme_unreg_wk(struct work_struct *wk)
456 {
457 struct cfg80211_registered_device *rdev;
458
459 rdev = container_of(wk, struct cfg80211_registered_device,
460 mlme_unreg_wk);
461
462 rtnl_lock();
463 cfg80211_process_mlme_unregistrations(rdev);
464 rtnl_unlock();
465 }
466
cfg80211_mlme_register_mgmt(struct wireless_dev * wdev,u32 snd_portid,u16 frame_type,const u8 * match_data,int match_len)467 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
468 u16 frame_type, const u8 *match_data,
469 int match_len)
470 {
471 struct wiphy *wiphy = wdev->wiphy;
472 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
473 struct cfg80211_mgmt_registration *reg, *nreg;
474 int err = 0;
475 u16 mgmt_type;
476
477 if (!wdev->wiphy->mgmt_stypes)
478 return -EOPNOTSUPP;
479
480 if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
481 return -EINVAL;
482
483 if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
484 return -EINVAL;
485
486 mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
487 if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type)))
488 return -EINVAL;
489
490 nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
491 if (!nreg)
492 return -ENOMEM;
493
494 spin_lock_bh(&wdev->mgmt_registrations_lock);
495
496 list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
497 int mlen = min(match_len, reg->match_len);
498
499 if (frame_type != le16_to_cpu(reg->frame_type))
500 continue;
501
502 if (memcmp(reg->match, match_data, mlen) == 0) {
503 err = -EALREADY;
504 break;
505 }
506 }
507
508 if (err) {
509 kfree(nreg);
510 goto out;
511 }
512
513 memcpy(nreg->match, match_data, match_len);
514 nreg->match_len = match_len;
515 nreg->nlportid = snd_portid;
516 nreg->frame_type = cpu_to_le16(frame_type);
517 nreg->wdev = wdev;
518 list_add(&nreg->list, &wdev->mgmt_registrations);
519 spin_unlock_bh(&wdev->mgmt_registrations_lock);
520
521 /* process all unregistrations to avoid driver confusion */
522 cfg80211_process_mlme_unregistrations(rdev);
523
524 if (rdev->ops->mgmt_frame_register)
525 rdev_mgmt_frame_register(rdev, wdev, frame_type, true);
526
527 return 0;
528
529 out:
530 spin_unlock_bh(&wdev->mgmt_registrations_lock);
531
532 return err;
533 }
534
cfg80211_mlme_unregister_socket(struct wireless_dev * wdev,u32 nlportid)535 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
536 {
537 struct wiphy *wiphy = wdev->wiphy;
538 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
539 struct cfg80211_mgmt_registration *reg, *tmp;
540
541 spin_lock_bh(&wdev->mgmt_registrations_lock);
542
543 list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
544 if (reg->nlportid != nlportid)
545 continue;
546
547 list_del(®->list);
548 spin_lock(&rdev->mlme_unreg_lock);
549 list_add_tail(®->list, &rdev->mlme_unreg);
550 spin_unlock(&rdev->mlme_unreg_lock);
551
552 schedule_work(&rdev->mlme_unreg_wk);
553 }
554
555 spin_unlock_bh(&wdev->mgmt_registrations_lock);
556
557 if (nlportid && rdev->crit_proto_nlportid == nlportid) {
558 rdev->crit_proto_nlportid = 0;
559 rdev_crit_proto_stop(rdev, wdev);
560 }
561
562 if (nlportid == wdev->ap_unexpected_nlportid)
563 wdev->ap_unexpected_nlportid = 0;
564 }
565
cfg80211_mlme_purge_registrations(struct wireless_dev * wdev)566 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
567 {
568 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
569
570 spin_lock_bh(&wdev->mgmt_registrations_lock);
571 spin_lock(&rdev->mlme_unreg_lock);
572 list_splice_tail_init(&wdev->mgmt_registrations, &rdev->mlme_unreg);
573 spin_unlock(&rdev->mlme_unreg_lock);
574 spin_unlock_bh(&wdev->mgmt_registrations_lock);
575
576 cfg80211_process_mlme_unregistrations(rdev);
577 }
578
cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,struct cfg80211_mgmt_tx_params * params,u64 * cookie)579 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
580 struct wireless_dev *wdev,
581 struct cfg80211_mgmt_tx_params *params, u64 *cookie)
582 {
583 const struct ieee80211_mgmt *mgmt;
584 u16 stype;
585
586 if (!wdev->wiphy->mgmt_stypes)
587 return -EOPNOTSUPP;
588
589 if (!rdev->ops->mgmt_tx)
590 return -EOPNOTSUPP;
591
592 if (params->len < 24 + 1)
593 return -EINVAL;
594
595 mgmt = (const struct ieee80211_mgmt *)params->buf;
596
597 if (!ieee80211_is_mgmt(mgmt->frame_control))
598 return -EINVAL;
599
600 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
601 if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
602 return -EINVAL;
603
604 if (ieee80211_is_action(mgmt->frame_control) &&
605 mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
606 int err = 0;
607
608 wdev_lock(wdev);
609
610 switch (wdev->iftype) {
611 case NL80211_IFTYPE_ADHOC:
612 case NL80211_IFTYPE_STATION:
613 case NL80211_IFTYPE_P2P_CLIENT:
614 if (!wdev->current_bss) {
615 err = -ENOTCONN;
616 break;
617 }
618
619 if (!ether_addr_equal(wdev->current_bss->pub.bssid,
620 mgmt->bssid)) {
621 err = -ENOTCONN;
622 break;
623 }
624
625 /*
626 * check for IBSS DA must be done by driver as
627 * cfg80211 doesn't track the stations
628 */
629 if (wdev->iftype == NL80211_IFTYPE_ADHOC)
630 break;
631
632 /* for station, check that DA is the AP */
633 if (!ether_addr_equal(wdev->current_bss->pub.bssid,
634 mgmt->da)) {
635 err = -ENOTCONN;
636 break;
637 }
638 break;
639 case NL80211_IFTYPE_AP:
640 case NL80211_IFTYPE_P2P_GO:
641 case NL80211_IFTYPE_AP_VLAN:
642 if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
643 err = -EINVAL;
644 break;
645 case NL80211_IFTYPE_MESH_POINT:
646 if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
647 err = -EINVAL;
648 break;
649 }
650 /*
651 * check for mesh DA must be done by driver as
652 * cfg80211 doesn't track the stations
653 */
654 break;
655 case NL80211_IFTYPE_P2P_DEVICE:
656 /*
657 * fall through, P2P device only supports
658 * public action frames
659 */
660 case NL80211_IFTYPE_NAN:
661 default:
662 err = -EOPNOTSUPP;
663 break;
664 }
665 wdev_unlock(wdev);
666
667 if (err)
668 return err;
669 }
670
671 if (!ether_addr_equal(mgmt->sa, wdev_address(wdev))) {
672 /* Allow random TA to be used with Public Action frames if the
673 * driver has indicated support for this. Otherwise, only allow
674 * the local address to be used.
675 */
676 if (!ieee80211_is_action(mgmt->frame_control) ||
677 mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
678 return -EINVAL;
679 if (!wdev->current_bss &&
680 !wiphy_ext_feature_isset(
681 &rdev->wiphy,
682 NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA))
683 return -EINVAL;
684 if (wdev->current_bss &&
685 !wiphy_ext_feature_isset(
686 &rdev->wiphy,
687 NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED))
688 return -EINVAL;
689 }
690
691 /* Transmit the Action frame as requested by user space */
692 return rdev_mgmt_tx(rdev, wdev, params, cookie);
693 }
694
cfg80211_rx_mgmt(struct wireless_dev * wdev,int freq,int sig_dbm,const u8 * buf,size_t len,u32 flags)695 bool cfg80211_rx_mgmt(struct wireless_dev *wdev, int freq, int sig_dbm,
696 const u8 *buf, size_t len, u32 flags)
697 {
698 struct wiphy *wiphy = wdev->wiphy;
699 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
700 struct cfg80211_mgmt_registration *reg;
701 const struct ieee80211_txrx_stypes *stypes =
702 &wiphy->mgmt_stypes[wdev->iftype];
703 struct ieee80211_mgmt *mgmt = (void *)buf;
704 const u8 *data;
705 int data_len;
706 bool result = false;
707 __le16 ftype = mgmt->frame_control &
708 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
709 u16 stype;
710
711 trace_cfg80211_rx_mgmt(wdev, freq, sig_dbm);
712 stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
713
714 if (!(stypes->rx & BIT(stype))) {
715 trace_cfg80211_return_bool(false);
716 return false;
717 }
718
719 data = buf + ieee80211_hdrlen(mgmt->frame_control);
720 data_len = len - ieee80211_hdrlen(mgmt->frame_control);
721
722 spin_lock_bh(&wdev->mgmt_registrations_lock);
723
724 list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
725 if (reg->frame_type != ftype)
726 continue;
727
728 if (reg->match_len > data_len)
729 continue;
730
731 if (memcmp(reg->match, data, reg->match_len))
732 continue;
733
734 /* found match! */
735
736 /* Indicate the received Action frame to user space */
737 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid,
738 freq, sig_dbm,
739 buf, len, flags, GFP_ATOMIC))
740 continue;
741
742 result = true;
743 break;
744 }
745
746 spin_unlock_bh(&wdev->mgmt_registrations_lock);
747
748 trace_cfg80211_return_bool(result);
749 return result;
750 }
751 EXPORT_SYMBOL(cfg80211_rx_mgmt);
752
cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device * rdev)753 void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev)
754 {
755 cancel_delayed_work(&rdev->dfs_update_channels_wk);
756 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0);
757 }
758
cfg80211_dfs_channels_update_work(struct work_struct * work)759 void cfg80211_dfs_channels_update_work(struct work_struct *work)
760 {
761 struct delayed_work *delayed_work = to_delayed_work(work);
762 struct cfg80211_registered_device *rdev;
763 struct cfg80211_chan_def chandef;
764 struct ieee80211_supported_band *sband;
765 struct ieee80211_channel *c;
766 struct wiphy *wiphy;
767 bool check_again = false;
768 unsigned long timeout, next_time = 0;
769 unsigned long time_dfs_update;
770 enum nl80211_radar_event radar_event;
771 int bandid, i;
772
773 rdev = container_of(delayed_work, struct cfg80211_registered_device,
774 dfs_update_channels_wk);
775 wiphy = &rdev->wiphy;
776
777 rtnl_lock();
778 for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
779 sband = wiphy->bands[bandid];
780 if (!sband)
781 continue;
782
783 for (i = 0; i < sband->n_channels; i++) {
784 c = &sband->channels[i];
785
786 if (!(c->flags & IEEE80211_CHAN_RADAR))
787 continue;
788
789 if (c->dfs_state != NL80211_DFS_UNAVAILABLE &&
790 c->dfs_state != NL80211_DFS_AVAILABLE)
791 continue;
792
793 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) {
794 time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS;
795 radar_event = NL80211_RADAR_NOP_FINISHED;
796 } else {
797 if (regulatory_pre_cac_allowed(wiphy) ||
798 cfg80211_any_wiphy_oper_chan(wiphy, c))
799 continue;
800
801 time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS;
802 radar_event = NL80211_RADAR_PRE_CAC_EXPIRED;
803 }
804
805 timeout = c->dfs_state_entered +
806 msecs_to_jiffies(time_dfs_update);
807
808 if (time_after_eq(jiffies, timeout)) {
809 c->dfs_state = NL80211_DFS_USABLE;
810 c->dfs_state_entered = jiffies;
811
812 cfg80211_chandef_create(&chandef, c,
813 NL80211_CHAN_NO_HT);
814
815 nl80211_radar_notify(rdev, &chandef,
816 radar_event, NULL,
817 GFP_ATOMIC);
818
819 regulatory_propagate_dfs_state(wiphy, &chandef,
820 c->dfs_state,
821 radar_event);
822 continue;
823 }
824
825 if (!check_again)
826 next_time = timeout - jiffies;
827 else
828 next_time = min(next_time, timeout - jiffies);
829 check_again = true;
830 }
831 }
832 rtnl_unlock();
833
834 /* reschedule if there are other channels waiting to be cleared again */
835 if (check_again)
836 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
837 next_time);
838 }
839
840
cfg80211_radar_event(struct wiphy * wiphy,struct cfg80211_chan_def * chandef,gfp_t gfp)841 void cfg80211_radar_event(struct wiphy *wiphy,
842 struct cfg80211_chan_def *chandef,
843 gfp_t gfp)
844 {
845 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
846
847 trace_cfg80211_radar_event(wiphy, chandef);
848
849 /* only set the chandef supplied channel to unavailable, in
850 * case the radar is detected on only one of multiple channels
851 * spanned by the chandef.
852 */
853 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
854
855 cfg80211_sched_dfs_chan_update(rdev);
856
857 nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
858
859 memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def));
860 queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);
861 }
862 EXPORT_SYMBOL(cfg80211_radar_event);
863
cfg80211_cac_event(struct net_device * netdev,const struct cfg80211_chan_def * chandef,enum nl80211_radar_event event,gfp_t gfp)864 void cfg80211_cac_event(struct net_device *netdev,
865 const struct cfg80211_chan_def *chandef,
866 enum nl80211_radar_event event, gfp_t gfp)
867 {
868 struct wireless_dev *wdev = netdev->ieee80211_ptr;
869 struct wiphy *wiphy = wdev->wiphy;
870 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
871 unsigned long timeout;
872
873 trace_cfg80211_cac_event(netdev, event);
874
875 if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED))
876 return;
877
878 if (WARN_ON(!wdev->chandef.chan))
879 return;
880
881 switch (event) {
882 case NL80211_RADAR_CAC_FINISHED:
883 timeout = wdev->cac_start_time +
884 msecs_to_jiffies(wdev->cac_time_ms);
885 WARN_ON(!time_after_eq(jiffies, timeout));
886 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
887 memcpy(&rdev->cac_done_chandef, chandef,
888 sizeof(struct cfg80211_chan_def));
889 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
890 cfg80211_sched_dfs_chan_update(rdev);
891 /* fall through */
892 case NL80211_RADAR_CAC_ABORTED:
893 wdev->cac_started = false;
894 break;
895 case NL80211_RADAR_CAC_STARTED:
896 wdev->cac_started = true;
897 break;
898 default:
899 WARN_ON(1);
900 return;
901 }
902
903 nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
904 }
905 EXPORT_SYMBOL(cfg80211_cac_event);
906
