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 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,struct cfg80211_bss * bss,const u8 * buf,size_t len,int uapsd_queues,const u8 * req_ies,size_t req_ies_len)24 void cfg80211_rx_assoc_resp(struct net_device *dev, struct cfg80211_bss *bss,
25 const u8 *buf, size_t len, int uapsd_queues,
26 const u8 *req_ies, size_t req_ies_len)
27 {
28 struct wireless_dev *wdev = dev->ieee80211_ptr;
29 struct wiphy *wiphy = wdev->wiphy;
30 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
31 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
32 struct cfg80211_connect_resp_params cr;
33 const u8 *resp_ie = mgmt->u.assoc_resp.variable;
34 size_t resp_ie_len = len - offsetof(struct ieee80211_mgmt,
35 u.assoc_resp.variable);
36
37 if (bss->channel->band == NL80211_BAND_S1GHZ) {
38 resp_ie = (u8 *)&mgmt->u.s1g_assoc_resp.variable;
39 resp_ie_len = len - offsetof(struct ieee80211_mgmt,
40 u.s1g_assoc_resp.variable);
41 }
42
43 memset(&cr, 0, sizeof(cr));
44 cr.status = (int)le16_to_cpu(mgmt->u.assoc_resp.status_code);
45 cr.bssid = mgmt->bssid;
46 cr.bss = bss;
47 cr.req_ie = req_ies;
48 cr.req_ie_len = req_ies_len;
49 cr.resp_ie = resp_ie;
50 cr.resp_ie_len = resp_ie_len;
51 cr.timeout_reason = NL80211_TIMEOUT_UNSPECIFIED;
52
53 trace_cfg80211_send_rx_assoc(dev, bss);
54
55 /*
56 * This is a bit of a hack, we don't notify userspace of
57 * a (re-)association reply if we tried to send a reassoc
58 * and got a reject -- we only try again with an assoc
59 * frame instead of reassoc.
60 */
61 if (cfg80211_sme_rx_assoc_resp(wdev, cr.status)) {
62 cfg80211_unhold_bss(bss_from_pub(bss));
63 cfg80211_put_bss(wiphy, bss);
64 return;
65 }
66
67 nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL, uapsd_queues,
68 req_ies, req_ies_len);
69 /* update current_bss etc., consumes the bss reference */
70 __cfg80211_connect_result(dev, &cr, cr.status == WLAN_STATUS_SUCCESS);
71 }
72 EXPORT_SYMBOL(cfg80211_rx_assoc_resp);
73
cfg80211_process_auth(struct wireless_dev * wdev,const u8 * buf,size_t len)74 static void cfg80211_process_auth(struct wireless_dev *wdev,
75 const u8 *buf, size_t len)
76 {
77 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
78
79 nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
80 cfg80211_sme_rx_auth(wdev, buf, len);
81 }
82
cfg80211_process_deauth(struct wireless_dev * wdev,const u8 * buf,size_t len)83 static void cfg80211_process_deauth(struct wireless_dev *wdev,
84 const u8 *buf, size_t len)
85 {
86 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
87 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
88 const u8 *bssid = mgmt->bssid;
89 u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
90 bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
91
92 nl80211_send_deauth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
93
94 if (!wdev->current_bss ||
95 !ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
96 return;
97
98 __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
99 cfg80211_sme_deauth(wdev);
100 }
101
cfg80211_process_disassoc(struct wireless_dev * wdev,const u8 * buf,size_t len)102 static void cfg80211_process_disassoc(struct wireless_dev *wdev,
103 const u8 *buf, size_t len)
104 {
105 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
106 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
107 const u8 *bssid = mgmt->bssid;
108 u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
109 bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);
110
111 nl80211_send_disassoc(rdev, wdev->netdev, buf, len, GFP_KERNEL);
112
113 if (WARN_ON(!wdev->current_bss ||
114 !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
115 return;
116
117 __cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
118 cfg80211_sme_disassoc(wdev);
119 }
120
cfg80211_rx_mlme_mgmt(struct net_device * dev,const u8 * buf,size_t len)121 void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
122 {
123 struct wireless_dev *wdev = dev->ieee80211_ptr;
124 struct ieee80211_mgmt *mgmt = (void *)buf;
125
126 ASSERT_WDEV_LOCK(wdev);
127
128 trace_cfg80211_rx_mlme_mgmt(dev, buf, len);
129
130 if (WARN_ON(len < 2))
131 return;
132
133 if (ieee80211_is_auth(mgmt->frame_control))
134 cfg80211_process_auth(wdev, buf, len);
135 else if (ieee80211_is_deauth(mgmt->frame_control))
136 cfg80211_process_deauth(wdev, buf, len);
137 else if (ieee80211_is_disassoc(mgmt->frame_control))
138 cfg80211_process_disassoc(wdev, buf, len);
139 }
140 EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt);
141
cfg80211_auth_timeout(struct net_device * dev,const u8 * addr)142 void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr)
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_auth_timeout(dev, addr);
149
150 nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
151 cfg80211_sme_auth_timeout(wdev);
152 }
153 EXPORT_SYMBOL(cfg80211_auth_timeout);
154
cfg80211_assoc_timeout(struct net_device * dev,struct cfg80211_bss * bss)155 void cfg80211_assoc_timeout(struct net_device *dev, struct cfg80211_bss *bss)
156 {
157 struct wireless_dev *wdev = dev->ieee80211_ptr;
158 struct wiphy *wiphy = wdev->wiphy;
159 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
160
161 trace_cfg80211_send_assoc_timeout(dev, bss->bssid);
162
163 nl80211_send_assoc_timeout(rdev, dev, bss->bssid, GFP_KERNEL);
164 cfg80211_sme_assoc_timeout(wdev);
165
166 cfg80211_unhold_bss(bss_from_pub(bss));
167 cfg80211_put_bss(wiphy, bss);
168 }
169 EXPORT_SYMBOL(cfg80211_assoc_timeout);
170
cfg80211_abandon_assoc(struct net_device * dev,struct cfg80211_bss * bss)171 void cfg80211_abandon_assoc(struct net_device *dev, struct cfg80211_bss *bss)
172 {
173 struct wireless_dev *wdev = dev->ieee80211_ptr;
174 struct wiphy *wiphy = wdev->wiphy;
175
176 cfg80211_sme_abandon_assoc(wdev);
177
178 cfg80211_unhold_bss(bss_from_pub(bss));
179 cfg80211_put_bss(wiphy, bss);
180 }
181 EXPORT_SYMBOL(cfg80211_abandon_assoc);
182
cfg80211_tx_mlme_mgmt(struct net_device * dev,const u8 * buf,size_t len)183 void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
184 {
185 struct wireless_dev *wdev = dev->ieee80211_ptr;
186 struct ieee80211_mgmt *mgmt = (void *)buf;
187
188 ASSERT_WDEV_LOCK(wdev);
189
190 trace_cfg80211_tx_mlme_mgmt(dev, buf, len);
191
192 if (WARN_ON(len < 2))
193 return;
194
195 if (ieee80211_is_deauth(mgmt->frame_control))
196 cfg80211_process_deauth(wdev, buf, len);
197 else
198 cfg80211_process_disassoc(wdev, buf, len);
199 }
200 EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt);
201
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)202 void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
203 enum nl80211_key_type key_type, int key_id,
204 const u8 *tsc, gfp_t gfp)
205 {
206 struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
207 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
208 #ifdef CONFIG_CFG80211_WEXT
209 union iwreq_data wrqu;
210 char *buf = kmalloc(128, gfp);
211
212 if (buf) {
213 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
214 "keyid=%d %scast addr=%pM)", key_id,
215 key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
216 addr);
217 memset(&wrqu, 0, sizeof(wrqu));
218 wrqu.data.length = strlen(buf);
219 wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
220 kfree(buf);
221 }
222 #endif
223
224 trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
225 nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
226 }
227 EXPORT_SYMBOL(cfg80211_michael_mic_failure);
228
229 /* 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)230 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
231 struct net_device *dev,
232 struct ieee80211_channel *chan,
233 enum nl80211_auth_type auth_type,
234 const u8 *bssid,
235 const u8 *ssid, int ssid_len,
236 const u8 *ie, int ie_len,
237 const u8 *key, int key_len, int key_idx,
238 const u8 *auth_data, int auth_data_len)
239 {
240 struct wireless_dev *wdev = dev->ieee80211_ptr;
241 struct cfg80211_auth_request req = {
242 .ie = ie,
243 .ie_len = ie_len,
244 .auth_data = auth_data,
245 .auth_data_len = auth_data_len,
246 .auth_type = auth_type,
247 .key = key,
248 .key_len = key_len,
249 .key_idx = key_idx,
250 };
251 int err;
252
253 ASSERT_WDEV_LOCK(wdev);
254
255 if (auth_type == NL80211_AUTHTYPE_SHARED_KEY)
256 if (!key || !key_len || key_idx < 0 || key_idx > 3)
257 return -EINVAL;
258
259 if (wdev->current_bss &&
260 ether_addr_equal(bssid, wdev->current_bss->pub.bssid))
261 return -EALREADY;
262
263 req.bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
264 IEEE80211_BSS_TYPE_ESS,
265 IEEE80211_PRIVACY_ANY);
266 if (!req.bss)
267 return -ENOENT;
268
269 err = rdev_auth(rdev, dev, &req);
270
271 cfg80211_put_bss(&rdev->wiphy, req.bss);
272 return err;
273 }
274
275 /* 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)276 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
277 const struct ieee80211_ht_cap *ht_capa_mask)
278 {
279 int i;
280 u8 *p1, *p2;
281 if (!ht_capa_mask) {
282 memset(ht_capa, 0, sizeof(*ht_capa));
283 return;
284 }
285
286 p1 = (u8*)(ht_capa);
287 p2 = (u8*)(ht_capa_mask);
288 for (i = 0; i < sizeof(*ht_capa); i++)
289 p1[i] &= p2[i];
290 }
291
292 /* 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)293 void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
294 const struct ieee80211_vht_cap *vht_capa_mask)
295 {
296 int i;
297 u8 *p1, *p2;
298 if (!vht_capa_mask) {
299 memset(vht_capa, 0, sizeof(*vht_capa));
300 return;
301 }
302
303 p1 = (u8*)(vht_capa);
304 p2 = (u8*)(vht_capa_mask);
305 for (i = 0; i < sizeof(*vht_capa); i++)
306 p1[i] &= p2[i];
307 }
308
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)309 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
310 struct net_device *dev,
311 struct ieee80211_channel *chan,
312 const u8 *bssid,
313 const u8 *ssid, int ssid_len,
314 struct cfg80211_assoc_request *req)
315 {
316 struct wireless_dev *wdev = dev->ieee80211_ptr;
317 int err;
318
319 ASSERT_WDEV_LOCK(wdev);
320
321 if (wdev->current_bss &&
322 (!req->prev_bssid || !ether_addr_equal(wdev->current_bss->pub.bssid,
323 req->prev_bssid)))
324 return -EALREADY;
325
326 cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
327 rdev->wiphy.ht_capa_mod_mask);
328 cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
329 rdev->wiphy.vht_capa_mod_mask);
330
331 req->bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
332 IEEE80211_BSS_TYPE_ESS,
333 IEEE80211_PRIVACY_ANY);
334 if (!req->bss)
335 return -ENOENT;
336
337 err = rdev_assoc(rdev, dev, req);
338 if (!err)
339 cfg80211_hold_bss(bss_from_pub(req->bss));
340 else
341 cfg80211_put_bss(&rdev->wiphy, req->bss);
342
343 return err;
344 }
345
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)346 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
347 struct net_device *dev, const u8 *bssid,
348 const u8 *ie, int ie_len, u16 reason,
349 bool local_state_change)
350 {
351 struct wireless_dev *wdev = dev->ieee80211_ptr;
352 struct cfg80211_deauth_request req = {
353 .bssid = bssid,
354 .reason_code = reason,
355 .ie = ie,
356 .ie_len = ie_len,
357 .local_state_change = local_state_change,
358 };
359
360 ASSERT_WDEV_LOCK(wdev);
361
362 if (local_state_change &&
363 (!wdev->current_bss ||
364 !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
365 return 0;
366
367 if (ether_addr_equal(wdev->disconnect_bssid, bssid) ||
368 (wdev->current_bss &&
369 ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
370 wdev->conn_owner_nlportid = 0;
371
372 return rdev_deauth(rdev, dev, &req);
373 }
374
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)375 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
376 struct net_device *dev, const u8 *bssid,
377 const u8 *ie, int ie_len, u16 reason,
378 bool local_state_change)
379 {
380 struct wireless_dev *wdev = dev->ieee80211_ptr;
381 struct cfg80211_disassoc_request req = {
382 .reason_code = reason,
383 .local_state_change = local_state_change,
384 .ie = ie,
385 .ie_len = ie_len,
386 };
387 int err;
388
389 ASSERT_WDEV_LOCK(wdev);
390
391 if (!wdev->current_bss)
392 return -ENOTCONN;
393
394 if (ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
395 req.bss = &wdev->current_bss->pub;
396 else
397 return -ENOTCONN;
398
399 err = rdev_disassoc(rdev, dev, &req);
400 if (err)
401 return err;
402
403 /* driver should have reported the disassoc */
404 WARN_ON(wdev->current_bss);
405 return 0;
406 }
407
cfg80211_mlme_down(struct cfg80211_registered_device * rdev,struct net_device * dev)408 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
409 struct net_device *dev)
410 {
411 struct wireless_dev *wdev = dev->ieee80211_ptr;
412 u8 bssid[ETH_ALEN];
413
414 ASSERT_WDEV_LOCK(wdev);
415
416 if (!rdev->ops->deauth)
417 return;
418
419 if (!wdev->current_bss)
420 return;
421
422 memcpy(bssid, wdev->current_bss->pub.bssid, ETH_ALEN);
423 cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
424 WLAN_REASON_DEAUTH_LEAVING, false);
425 }
426
427 struct cfg80211_mgmt_registration {
428 struct list_head list;
429 struct wireless_dev *wdev;
430
431 u32 nlportid;
432
433 int match_len;
434
435 __le16 frame_type;
436
437 bool multicast_rx;
438
439 u8 match[];
440 };
441
cfg80211_mgmt_registrations_update(struct wireless_dev * wdev)442 static void cfg80211_mgmt_registrations_update(struct wireless_dev *wdev)
443 {
444 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
445 struct wireless_dev *tmp;
446 struct cfg80211_mgmt_registration *reg;
447 struct mgmt_frame_regs upd = {};
448
449 ASSERT_RTNL();
450
451 spin_lock_bh(&wdev->mgmt_registrations_lock);
452 if (!wdev->mgmt_registrations_need_update) {
453 spin_unlock_bh(&wdev->mgmt_registrations_lock);
454 return;
455 }
456
457 rcu_read_lock();
458 list_for_each_entry_rcu(tmp, &rdev->wiphy.wdev_list, list) {
459 list_for_each_entry(reg, &tmp->mgmt_registrations, list) {
460 u32 mask = BIT(le16_to_cpu(reg->frame_type) >> 4);
461 u32 mcast_mask = 0;
462
463 if (reg->multicast_rx)
464 mcast_mask = mask;
465
466 upd.global_stypes |= mask;
467 upd.global_mcast_stypes |= mcast_mask;
468
469 if (tmp == wdev) {
470 upd.interface_stypes |= mask;
471 upd.interface_mcast_stypes |= mcast_mask;
472 }
473 }
474 }
475 rcu_read_unlock();
476
477 wdev->mgmt_registrations_need_update = 0;
478 spin_unlock_bh(&wdev->mgmt_registrations_lock);
479
480 rdev_update_mgmt_frame_registrations(rdev, wdev, &upd);
481 }
482
cfg80211_mgmt_registrations_update_wk(struct work_struct * wk)483 void cfg80211_mgmt_registrations_update_wk(struct work_struct *wk)
484 {
485 struct cfg80211_registered_device *rdev;
486 struct wireless_dev *wdev;
487
488 rdev = container_of(wk, struct cfg80211_registered_device,
489 mgmt_registrations_update_wk);
490
491 rtnl_lock();
492 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
493 cfg80211_mgmt_registrations_update(wdev);
494 rtnl_unlock();
495 }
496
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)497 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
498 u16 frame_type, const u8 *match_data,
499 int match_len, bool multicast_rx,
500 struct netlink_ext_ack *extack)
501 {
502 struct cfg80211_mgmt_registration *reg, *nreg;
503 int err = 0;
504 u16 mgmt_type;
505 bool update_multicast = false;
506
507 if (!wdev->wiphy->mgmt_stypes)
508 return -EOPNOTSUPP;
509
510 if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT) {
511 NL_SET_ERR_MSG(extack, "frame type not management");
512 return -EINVAL;
513 }
514
515 if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) {
516 NL_SET_ERR_MSG(extack, "Invalid frame type");
517 return -EINVAL;
518 }
519
520 mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
521 if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type))) {
522 NL_SET_ERR_MSG(extack,
523 "Registration to specific type not supported");
524 return -EINVAL;
525 }
526
527 /*
528 * To support Pre Association Security Negotiation (PASN), registration
529 * for authentication frames should be supported. However, as some
530 * versions of the user space daemons wrongly register to all types of
531 * authentication frames (which might result in unexpected behavior)
532 * allow such registration if the request is for a specific
533 * authentication algorithm number.
534 */
535 if (wdev->iftype == NL80211_IFTYPE_STATION &&
536 (frame_type & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_AUTH &&
537 !(match_data && match_len >= 2)) {
538 NL_SET_ERR_MSG(extack,
539 "Authentication algorithm number required");
540 return -EINVAL;
541 }
542
543 nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
544 if (!nreg)
545 return -ENOMEM;
546
547 spin_lock_bh(&wdev->mgmt_registrations_lock);
548
549 list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
550 int mlen = min(match_len, reg->match_len);
551
552 if (frame_type != le16_to_cpu(reg->frame_type))
553 continue;
554
555 if (memcmp(reg->match, match_data, mlen) == 0) {
556 if (reg->multicast_rx != multicast_rx) {
557 update_multicast = true;
558 reg->multicast_rx = multicast_rx;
559 break;
560 }
561 NL_SET_ERR_MSG(extack, "Match already configured");
562 err = -EALREADY;
563 break;
564 }
565 }
566
567 if (err)
568 goto out;
569
570 if (update_multicast) {
571 kfree(nreg);
572 } else {
573 memcpy(nreg->match, match_data, match_len);
574 nreg->match_len = match_len;
575 nreg->nlportid = snd_portid;
576 nreg->frame_type = cpu_to_le16(frame_type);
577 nreg->wdev = wdev;
578 nreg->multicast_rx = multicast_rx;
579 list_add(&nreg->list, &wdev->mgmt_registrations);
580 }
581 wdev->mgmt_registrations_need_update = 1;
582 spin_unlock_bh(&wdev->mgmt_registrations_lock);
583
584 cfg80211_mgmt_registrations_update(wdev);
585
586 return 0;
587
588 out:
589 kfree(nreg);
590 spin_unlock_bh(&wdev->mgmt_registrations_lock);
591
592 return err;
593 }
594
cfg80211_mlme_unregister_socket(struct wireless_dev * wdev,u32 nlportid)595 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
596 {
597 struct wiphy *wiphy = wdev->wiphy;
598 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
599 struct cfg80211_mgmt_registration *reg, *tmp;
600
601 spin_lock_bh(&wdev->mgmt_registrations_lock);
602
603 list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
604 if (reg->nlportid != nlportid)
605 continue;
606
607 list_del(®->list);
608 kfree(reg);
609
610 wdev->mgmt_registrations_need_update = 1;
611 schedule_work(&rdev->mgmt_registrations_update_wk);
612 }
613
614 spin_unlock_bh(&wdev->mgmt_registrations_lock);
615
616 if (nlportid && rdev->crit_proto_nlportid == nlportid) {
617 rdev->crit_proto_nlportid = 0;
618 rdev_crit_proto_stop(rdev, wdev);
619 }
620
621 if (nlportid == wdev->ap_unexpected_nlportid)
622 wdev->ap_unexpected_nlportid = 0;
623 }
624
cfg80211_mlme_purge_registrations(struct wireless_dev * wdev)625 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
626 {
627 struct cfg80211_mgmt_registration *reg, *tmp;
628
629 spin_lock_bh(&wdev->mgmt_registrations_lock);
630 list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
631 list_del(®->list);
632 kfree(reg);
633 }
634 wdev->mgmt_registrations_need_update = 1;
635 spin_unlock_bh(&wdev->mgmt_registrations_lock);
636
637 cfg80211_mgmt_registrations_update(wdev);
638 }
639
cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev,struct cfg80211_mgmt_tx_params * params,u64 * cookie)640 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
641 struct wireless_dev *wdev,
642 struct cfg80211_mgmt_tx_params *params, u64 *cookie)
643 {
644 const struct ieee80211_mgmt *mgmt;
645 u16 stype;
646
647 if (!wdev->wiphy->mgmt_stypes)
648 return -EOPNOTSUPP;
649
650 if (!rdev->ops->mgmt_tx)
651 return -EOPNOTSUPP;
652
653 if (params->len < 24 + 1)
654 return -EINVAL;
655
656 mgmt = (const struct ieee80211_mgmt *)params->buf;
657
658 if (!ieee80211_is_mgmt(mgmt->frame_control))
659 return -EINVAL;
660
661 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
662 if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
663 return -EINVAL;
664
665 if (ieee80211_is_action(mgmt->frame_control) &&
666 mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
667 int err = 0;
668
669 wdev_lock(wdev);
670
671 switch (wdev->iftype) {
672 case NL80211_IFTYPE_ADHOC:
673 case NL80211_IFTYPE_STATION:
674 case NL80211_IFTYPE_P2P_CLIENT:
675 if (!wdev->current_bss) {
676 err = -ENOTCONN;
677 break;
678 }
679
680 if (!ether_addr_equal(wdev->current_bss->pub.bssid,
681 mgmt->bssid)) {
682 err = -ENOTCONN;
683 break;
684 }
685
686 /*
687 * check for IBSS DA must be done by driver as
688 * cfg80211 doesn't track the stations
689 */
690 if (wdev->iftype == NL80211_IFTYPE_ADHOC)
691 break;
692
693 /* for station, check that DA is the AP */
694 if (!ether_addr_equal(wdev->current_bss->pub.bssid,
695 mgmt->da)) {
696 err = -ENOTCONN;
697 break;
698 }
699 break;
700 case NL80211_IFTYPE_AP:
701 case NL80211_IFTYPE_P2P_GO:
702 case NL80211_IFTYPE_AP_VLAN:
703 if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
704 err = -EINVAL;
705 break;
706 case NL80211_IFTYPE_MESH_POINT:
707 if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
708 err = -EINVAL;
709 break;
710 }
711 /*
712 * check for mesh DA must be done by driver as
713 * cfg80211 doesn't track the stations
714 */
715 break;
716 case NL80211_IFTYPE_P2P_DEVICE:
717 /*
718 * fall through, P2P device only supports
719 * public action frames
720 */
721 case NL80211_IFTYPE_NAN:
722 default:
723 err = -EOPNOTSUPP;
724 break;
725 }
726 wdev_unlock(wdev);
727
728 if (err)
729 return err;
730 }
731
732 if (!ether_addr_equal(mgmt->sa, wdev_address(wdev))) {
733 /* Allow random TA to be used with Public Action frames if the
734 * driver has indicated support for this. Otherwise, only allow
735 * the local address to be used.
736 */
737 if (!ieee80211_is_action(mgmt->frame_control) ||
738 mgmt->u.action.category != WLAN_CATEGORY_PUBLIC)
739 return -EINVAL;
740 if (!wdev->current_bss &&
741 !wiphy_ext_feature_isset(
742 &rdev->wiphy,
743 NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA))
744 return -EINVAL;
745 if (wdev->current_bss &&
746 !wiphy_ext_feature_isset(
747 &rdev->wiphy,
748 NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED))
749 return -EINVAL;
750 }
751
752 /* Transmit the Action frame as requested by user space */
753 return rdev_mgmt_tx(rdev, wdev, params, cookie);
754 }
755
cfg80211_rx_mgmt_khz(struct wireless_dev * wdev,int freq,int sig_dbm,const u8 * buf,size_t len,u32 flags)756 bool cfg80211_rx_mgmt_khz(struct wireless_dev *wdev, int freq, int sig_dbm,
757 const u8 *buf, size_t len, u32 flags)
758 {
759 struct wiphy *wiphy = wdev->wiphy;
760 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
761 struct cfg80211_mgmt_registration *reg;
762 const struct ieee80211_txrx_stypes *stypes =
763 &wiphy->mgmt_stypes[wdev->iftype];
764 struct ieee80211_mgmt *mgmt = (void *)buf;
765 const u8 *data;
766 int data_len;
767 bool result = false;
768 __le16 ftype = mgmt->frame_control &
769 cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
770 u16 stype;
771
772 trace_cfg80211_rx_mgmt(wdev, freq, sig_dbm);
773 stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;
774
775 if (!(stypes->rx & BIT(stype))) {
776 trace_cfg80211_return_bool(false);
777 return false;
778 }
779
780 data = buf + ieee80211_hdrlen(mgmt->frame_control);
781 data_len = len - ieee80211_hdrlen(mgmt->frame_control);
782
783 spin_lock_bh(&wdev->mgmt_registrations_lock);
784
785 list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
786 if (reg->frame_type != ftype)
787 continue;
788
789 if (reg->match_len > data_len)
790 continue;
791
792 if (memcmp(reg->match, data, reg->match_len))
793 continue;
794
795 /* found match! */
796
797 /* Indicate the received Action frame to user space */
798 if (nl80211_send_mgmt(rdev, wdev, reg->nlportid,
799 freq, sig_dbm,
800 buf, len, flags, GFP_ATOMIC))
801 continue;
802
803 result = true;
804 break;
805 }
806
807 spin_unlock_bh(&wdev->mgmt_registrations_lock);
808
809 trace_cfg80211_return_bool(result);
810 return result;
811 }
812 EXPORT_SYMBOL(cfg80211_rx_mgmt_khz);
813
cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device * rdev)814 void cfg80211_sched_dfs_chan_update(struct cfg80211_registered_device *rdev)
815 {
816 cancel_delayed_work(&rdev->dfs_update_channels_wk);
817 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk, 0);
818 }
819
cfg80211_dfs_channels_update_work(struct work_struct * work)820 void cfg80211_dfs_channels_update_work(struct work_struct *work)
821 {
822 struct delayed_work *delayed_work = to_delayed_work(work);
823 struct cfg80211_registered_device *rdev;
824 struct cfg80211_chan_def chandef;
825 struct ieee80211_supported_band *sband;
826 struct ieee80211_channel *c;
827 struct wiphy *wiphy;
828 bool check_again = false;
829 unsigned long timeout, next_time = 0;
830 unsigned long time_dfs_update;
831 enum nl80211_radar_event radar_event;
832 int bandid, i;
833
834 rdev = container_of(delayed_work, struct cfg80211_registered_device,
835 dfs_update_channels_wk);
836 wiphy = &rdev->wiphy;
837
838 rtnl_lock();
839 for (bandid = 0; bandid < NUM_NL80211_BANDS; bandid++) {
840 sband = wiphy->bands[bandid];
841 if (!sband)
842 continue;
843
844 for (i = 0; i < sband->n_channels; i++) {
845 c = &sband->channels[i];
846
847 if (!(c->flags & IEEE80211_CHAN_RADAR))
848 continue;
849
850 if (c->dfs_state != NL80211_DFS_UNAVAILABLE &&
851 c->dfs_state != NL80211_DFS_AVAILABLE)
852 continue;
853
854 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) {
855 time_dfs_update = IEEE80211_DFS_MIN_NOP_TIME_MS;
856 radar_event = NL80211_RADAR_NOP_FINISHED;
857 } else {
858 if (regulatory_pre_cac_allowed(wiphy) ||
859 cfg80211_any_wiphy_oper_chan(wiphy, c))
860 continue;
861
862 time_dfs_update = REG_PRE_CAC_EXPIRY_GRACE_MS;
863 radar_event = NL80211_RADAR_PRE_CAC_EXPIRED;
864 }
865
866 timeout = c->dfs_state_entered +
867 msecs_to_jiffies(time_dfs_update);
868
869 if (time_after_eq(jiffies, timeout)) {
870 c->dfs_state = NL80211_DFS_USABLE;
871 c->dfs_state_entered = jiffies;
872
873 cfg80211_chandef_create(&chandef, c,
874 NL80211_CHAN_NO_HT);
875
876 nl80211_radar_notify(rdev, &chandef,
877 radar_event, NULL,
878 GFP_ATOMIC);
879
880 regulatory_propagate_dfs_state(wiphy, &chandef,
881 c->dfs_state,
882 radar_event);
883 continue;
884 }
885
886 if (!check_again)
887 next_time = timeout - jiffies;
888 else
889 next_time = min(next_time, timeout - jiffies);
890 check_again = true;
891 }
892 }
893 rtnl_unlock();
894
895 /* reschedule if there are other channels waiting to be cleared again */
896 if (check_again)
897 queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
898 next_time);
899 }
900
901
cfg80211_radar_event(struct wiphy * wiphy,struct cfg80211_chan_def * chandef,gfp_t gfp)902 void cfg80211_radar_event(struct wiphy *wiphy,
903 struct cfg80211_chan_def *chandef,
904 gfp_t gfp)
905 {
906 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
907
908 trace_cfg80211_radar_event(wiphy, chandef);
909
910 /* only set the chandef supplied channel to unavailable, in
911 * case the radar is detected on only one of multiple channels
912 * spanned by the chandef.
913 */
914 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
915
916 cfg80211_sched_dfs_chan_update(rdev);
917
918 nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
919
920 memcpy(&rdev->radar_chandef, chandef, sizeof(struct cfg80211_chan_def));
921 queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);
922 }
923 EXPORT_SYMBOL(cfg80211_radar_event);
924
cfg80211_cac_event(struct net_device * netdev,const struct cfg80211_chan_def * chandef,enum nl80211_radar_event event,gfp_t gfp)925 void cfg80211_cac_event(struct net_device *netdev,
926 const struct cfg80211_chan_def *chandef,
927 enum nl80211_radar_event event, gfp_t gfp)
928 {
929 struct wireless_dev *wdev = netdev->ieee80211_ptr;
930 struct wiphy *wiphy = wdev->wiphy;
931 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
932 unsigned long timeout;
933
934 trace_cfg80211_cac_event(netdev, event);
935
936 if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED))
937 return;
938
939 if (WARN_ON(!wdev->chandef.chan))
940 return;
941
942 switch (event) {
943 case NL80211_RADAR_CAC_FINISHED:
944 timeout = wdev->cac_start_time +
945 msecs_to_jiffies(wdev->cac_time_ms);
946 WARN_ON(!time_after_eq(jiffies, timeout));
947 cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
948 memcpy(&rdev->cac_done_chandef, chandef,
949 sizeof(struct cfg80211_chan_def));
950 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
951 cfg80211_sched_dfs_chan_update(rdev);
952 fallthrough;
953 case NL80211_RADAR_CAC_ABORTED:
954 wdev->cac_started = false;
955 break;
956 case NL80211_RADAR_CAC_STARTED:
957 wdev->cac_started = true;
958 break;
959 default:
960 WARN_ON(1);
961 return;
962 }
963
964 nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
965 }
966 EXPORT_SYMBOL(cfg80211_cac_event);
967
