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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
2a519311 JB |
2 | /* |
3 | * cfg80211 scan result handling | |
4 | * | |
5 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> | |
2740f0cf | 6 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
1d76250b | 7 | * Copyright 2016 Intel Deutschland GmbH |
0b8fb823 | 8 | * Copyright (C) 2018-2019 Intel Corporation |
2a519311 JB |
9 | */ |
10 | #include <linux/kernel.h> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
2a519311 JB |
12 | #include <linux/module.h> |
13 | #include <linux/netdevice.h> | |
14 | #include <linux/wireless.h> | |
15 | #include <linux/nl80211.h> | |
16 | #include <linux/etherdevice.h> | |
17 | #include <net/arp.h> | |
18 | #include <net/cfg80211.h> | |
262eb9b2 | 19 | #include <net/cfg80211-wext.h> |
2a519311 JB |
20 | #include <net/iw_handler.h> |
21 | #include "core.h" | |
22 | #include "nl80211.h" | |
a9a11622 | 23 | #include "wext-compat.h" |
e35e4d28 | 24 | #include "rdev-ops.h" |
2a519311 | 25 | |
776b3580 JB |
26 | /** |
27 | * DOC: BSS tree/list structure | |
28 | * | |
29 | * At the top level, the BSS list is kept in both a list in each | |
30 | * registered device (@bss_list) as well as an RB-tree for faster | |
31 | * lookup. In the RB-tree, entries can be looked up using their | |
32 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID | |
33 | * for other BSSes. | |
34 | * | |
35 | * Due to the possibility of hidden SSIDs, there's a second level | |
36 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. | |
37 | * The hidden_list connects all BSSes belonging to a single AP | |
38 | * that has a hidden SSID, and connects beacon and probe response | |
39 | * entries. For a probe response entry for a hidden SSID, the | |
40 | * hidden_beacon_bss pointer points to the BSS struct holding the | |
41 | * beacon's information. | |
42 | * | |
43 | * Reference counting is done for all these references except for | |
44 | * the hidden_list, so that a beacon BSS struct that is otherwise | |
45 | * not referenced has one reference for being on the bss_list and | |
46 | * one for each probe response entry that points to it using the | |
47 | * hidden_beacon_bss pointer. When a BSS struct that has such a | |
48 | * pointer is get/put, the refcount update is also propagated to | |
49 | * the referenced struct, this ensure that it cannot get removed | |
50 | * while somebody is using the probe response version. | |
51 | * | |
52 | * Note that the hidden_beacon_bss pointer never changes, due to | |
53 | * the reference counting. Therefore, no locking is needed for | |
54 | * it. | |
55 | * | |
56 | * Also note that the hidden_beacon_bss pointer is only relevant | |
57 | * if the driver uses something other than the IEs, e.g. private | |
58 | * data stored stored in the BSS struct, since the beacon IEs are | |
59 | * also linked into the probe response struct. | |
60 | */ | |
61 | ||
9853a55e JB |
62 | /* |
63 | * Limit the number of BSS entries stored in mac80211. Each one is | |
64 | * a bit over 4k at most, so this limits to roughly 4-5M of memory. | |
65 | * If somebody wants to really attack this though, they'd likely | |
66 | * use small beacons, and only one type of frame, limiting each of | |
67 | * the entries to a much smaller size (in order to generate more | |
68 | * entries in total, so overhead is bigger.) | |
69 | */ | |
70 | static int bss_entries_limit = 1000; | |
71 | module_param(bss_entries_limit, int, 0644); | |
72 | MODULE_PARM_DESC(bss_entries_limit, | |
73 | "limit to number of scan BSS entries (per wiphy, default 1000)"); | |
74 | ||
f9616e0f | 75 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 76 | |
776b3580 | 77 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 78 | { |
9caf0364 | 79 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
80 | |
81 | if (WARN_ON(atomic_read(&bss->hold))) | |
82 | return; | |
83 | ||
9caf0364 | 84 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 85 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
86 | kfree_rcu(ies, rcu_head); |
87 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
88 | if (ies) | |
89 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 90 | |
776b3580 JB |
91 | /* |
92 | * This happens when the module is removed, it doesn't | |
93 | * really matter any more save for completeness | |
94 | */ | |
95 | if (!list_empty(&bss->hidden_list)) | |
96 | list_del(&bss->hidden_list); | |
97 | ||
e8e27c66 AK |
98 | kfree(bss); |
99 | } | |
100 | ||
1b8ec87a | 101 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
776b3580 | 102 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 103 | { |
1b8ec87a | 104 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
105 | |
106 | bss->refcount++; | |
107 | if (bss->pub.hidden_beacon_bss) { | |
108 | bss = container_of(bss->pub.hidden_beacon_bss, | |
109 | struct cfg80211_internal_bss, | |
110 | pub); | |
111 | bss->refcount++; | |
112 | } | |
7011ba58 SS |
113 | if (bss->pub.transmitted_bss) { |
114 | bss = container_of(bss->pub.transmitted_bss, | |
a3584f56 SS |
115 | struct cfg80211_internal_bss, |
116 | pub); | |
117 | bss->refcount++; | |
118 | } | |
0532d4f1 JB |
119 | } |
120 | ||
1b8ec87a | 121 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
776b3580 | 122 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 123 | { |
1b8ec87a | 124 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
125 | |
126 | if (bss->pub.hidden_beacon_bss) { | |
127 | struct cfg80211_internal_bss *hbss; | |
128 | hbss = container_of(bss->pub.hidden_beacon_bss, | |
129 | struct cfg80211_internal_bss, | |
130 | pub); | |
131 | hbss->refcount--; | |
132 | if (hbss->refcount == 0) | |
133 | bss_free(hbss); | |
134 | } | |
a3584f56 | 135 | |
7011ba58 | 136 | if (bss->pub.transmitted_bss) { |
a3584f56 SS |
137 | struct cfg80211_internal_bss *tbss; |
138 | ||
7011ba58 | 139 | tbss = container_of(bss->pub.transmitted_bss, |
a3584f56 SS |
140 | struct cfg80211_internal_bss, |
141 | pub); | |
142 | tbss->refcount--; | |
143 | if (tbss->refcount == 0) | |
144 | bss_free(tbss); | |
145 | } | |
146 | ||
776b3580 JB |
147 | bss->refcount--; |
148 | if (bss->refcount == 0) | |
149 | bss_free(bss); | |
0532d4f1 JB |
150 | } |
151 | ||
1b8ec87a | 152 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
153 | struct cfg80211_internal_bss *bss) |
154 | { | |
1b8ec87a | 155 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 156 | |
776b3580 JB |
157 | if (!list_empty(&bss->hidden_list)) { |
158 | /* | |
159 | * don't remove the beacon entry if it has | |
160 | * probe responses associated with it | |
161 | */ | |
162 | if (!bss->pub.hidden_beacon_bss) | |
163 | return false; | |
164 | /* | |
165 | * if it's a probe response entry break its | |
166 | * link to the other entries in the group | |
167 | */ | |
168 | list_del_init(&bss->hidden_list); | |
169 | } | |
170 | ||
e8e27c66 | 171 | list_del_init(&bss->list); |
7011ba58 | 172 | list_del_init(&bss->pub.nontrans_list); |
1b8ec87a | 173 | rb_erase(&bss->rbn, &rdev->bss_tree); |
9853a55e JB |
174 | rdev->bss_entries--; |
175 | WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list), | |
176 | "rdev bss entries[%d]/list[empty:%d] corruption\n", | |
177 | rdev->bss_entries, list_empty(&rdev->bss_list)); | |
1b8ec87a | 178 | bss_ref_put(rdev, bss); |
776b3580 | 179 | return true; |
e8e27c66 AK |
180 | } |
181 | ||
0b8fb823 PX |
182 | static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen, |
183 | const u8 *subelement, size_t subie_len, | |
184 | u8 *new_ie, gfp_t gfp) | |
185 | { | |
186 | u8 *pos, *tmp; | |
187 | const u8 *tmp_old, *tmp_new; | |
188 | u8 *sub_copy; | |
189 | ||
190 | /* copy subelement as we need to change its content to | |
191 | * mark an ie after it is processed. | |
192 | */ | |
193 | sub_copy = kmalloc(subie_len, gfp); | |
194 | if (!sub_copy) | |
195 | return 0; | |
196 | memcpy(sub_copy, subelement, subie_len); | |
197 | ||
198 | pos = &new_ie[0]; | |
199 | ||
200 | /* set new ssid */ | |
201 | tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len); | |
202 | if (tmp_new) { | |
203 | memcpy(pos, tmp_new, tmp_new[1] + 2); | |
204 | pos += (tmp_new[1] + 2); | |
205 | } | |
206 | ||
207 | /* go through IEs in ie (skip SSID) and subelement, | |
208 | * merge them into new_ie | |
209 | */ | |
210 | tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen); | |
211 | tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie; | |
212 | ||
213 | while (tmp_old + tmp_old[1] + 2 - ie <= ielen) { | |
214 | if (tmp_old[0] == 0) { | |
215 | tmp_old++; | |
216 | continue; | |
217 | } | |
218 | ||
c17fe043 SS |
219 | if (tmp_old[0] == WLAN_EID_EXTENSION) |
220 | tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy, | |
221 | subie_len); | |
222 | else | |
223 | tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy, | |
224 | subie_len); | |
225 | ||
0b8fb823 PX |
226 | if (!tmp) { |
227 | /* ie in old ie but not in subelement */ | |
228 | if (tmp_old[0] != WLAN_EID_MULTIPLE_BSSID) { | |
229 | memcpy(pos, tmp_old, tmp_old[1] + 2); | |
230 | pos += tmp_old[1] + 2; | |
231 | } | |
232 | } else { | |
233 | /* ie in transmitting ie also in subelement, | |
234 | * copy from subelement and flag the ie in subelement | |
c17fe043 SS |
235 | * as copied (by setting eid field to WLAN_EID_SSID, |
236 | * which is skipped anyway). | |
237 | * For vendor ie, compare OUI + type + subType to | |
0b8fb823 PX |
238 | * determine if they are the same ie. |
239 | */ | |
240 | if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) { | |
241 | if (!memcmp(tmp_old + 2, tmp + 2, 5)) { | |
242 | /* same vendor ie, copy from | |
243 | * subelement | |
244 | */ | |
245 | memcpy(pos, tmp, tmp[1] + 2); | |
246 | pos += tmp[1] + 2; | |
c17fe043 | 247 | tmp[0] = WLAN_EID_SSID; |
0b8fb823 PX |
248 | } else { |
249 | memcpy(pos, tmp_old, tmp_old[1] + 2); | |
250 | pos += tmp_old[1] + 2; | |
251 | } | |
252 | } else { | |
253 | /* copy ie from subelement into new ie */ | |
254 | memcpy(pos, tmp, tmp[1] + 2); | |
255 | pos += tmp[1] + 2; | |
c17fe043 | 256 | tmp[0] = WLAN_EID_SSID; |
0b8fb823 PX |
257 | } |
258 | } | |
259 | ||
260 | if (tmp_old + tmp_old[1] + 2 - ie == ielen) | |
261 | break; | |
262 | ||
263 | tmp_old += tmp_old[1] + 2; | |
264 | } | |
265 | ||
266 | /* go through subelement again to check if there is any ie not | |
267 | * copied to new ie, skip ssid, capability, bssid-index ie | |
268 | */ | |
269 | tmp_new = sub_copy; | |
270 | while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) { | |
271 | if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP || | |
272 | tmp_new[0] == WLAN_EID_SSID || | |
c17fe043 | 273 | tmp_new[0] == WLAN_EID_MULTI_BSSID_IDX)) { |
0b8fb823 PX |
274 | memcpy(pos, tmp_new, tmp_new[1] + 2); |
275 | pos += tmp_new[1] + 2; | |
276 | } | |
277 | if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len) | |
278 | break; | |
279 | tmp_new += tmp_new[1] + 2; | |
280 | } | |
281 | ||
282 | kfree(sub_copy); | |
283 | return pos - new_ie; | |
284 | } | |
285 | ||
286 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, | |
287 | const u8 *ssid, size_t ssid_len) | |
288 | { | |
289 | const struct cfg80211_bss_ies *ies; | |
290 | const u8 *ssidie; | |
291 | ||
292 | if (bssid && !ether_addr_equal(a->bssid, bssid)) | |
293 | return false; | |
294 | ||
295 | if (!ssid) | |
296 | return true; | |
297 | ||
298 | ies = rcu_access_pointer(a->ies); | |
299 | if (!ies) | |
300 | return false; | |
301 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
302 | if (!ssidie) | |
303 | return false; | |
304 | if (ssidie[1] != ssid_len) | |
305 | return false; | |
306 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
307 | } | |
308 | ||
309 | static int | |
7011ba58 SS |
310 | cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss, |
311 | struct cfg80211_bss *nontrans_bss) | |
0b8fb823 PX |
312 | { |
313 | const u8 *ssid; | |
314 | size_t ssid_len; | |
7011ba58 | 315 | struct cfg80211_bss *bss = NULL; |
0b8fb823 PX |
316 | |
317 | rcu_read_lock(); | |
7011ba58 | 318 | ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID); |
0b8fb823 PX |
319 | if (!ssid) { |
320 | rcu_read_unlock(); | |
321 | return -EINVAL; | |
322 | } | |
323 | ssid_len = ssid[1]; | |
324 | ssid = ssid + 2; | |
325 | rcu_read_unlock(); | |
326 | ||
327 | /* check if nontrans_bss is in the list */ | |
328 | list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) { | |
7011ba58 | 329 | if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len)) |
0b8fb823 PX |
330 | return 0; |
331 | } | |
332 | ||
333 | /* add to the list */ | |
334 | list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list); | |
335 | return 0; | |
336 | } | |
337 | ||
1b8ec87a | 338 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
339 | unsigned long expire_time) |
340 | { | |
341 | struct cfg80211_internal_bss *bss, *tmp; | |
342 | bool expired = false; | |
343 | ||
1b8ec87a | 344 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 345 | |
1b8ec87a | 346 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
347 | if (atomic_read(&bss->hold)) |
348 | continue; | |
349 | if (!time_after(expire_time, bss->ts)) | |
350 | continue; | |
351 | ||
1b8ec87a | 352 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 353 | expired = true; |
15d6030b SL |
354 | } |
355 | ||
356 | if (expired) | |
1b8ec87a | 357 | rdev->bss_generation++; |
15d6030b SL |
358 | } |
359 | ||
9853a55e JB |
360 | static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) |
361 | { | |
362 | struct cfg80211_internal_bss *bss, *oldest = NULL; | |
363 | bool ret; | |
364 | ||
365 | lockdep_assert_held(&rdev->bss_lock); | |
366 | ||
367 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
368 | if (atomic_read(&bss->hold)) | |
369 | continue; | |
370 | ||
371 | if (!list_empty(&bss->hidden_list) && | |
372 | !bss->pub.hidden_beacon_bss) | |
373 | continue; | |
374 | ||
375 | if (oldest && time_before(oldest->ts, bss->ts)) | |
376 | continue; | |
377 | oldest = bss; | |
378 | } | |
379 | ||
380 | if (WARN_ON(!oldest)) | |
381 | return false; | |
382 | ||
383 | /* | |
384 | * The callers make sure to increase rdev->bss_generation if anything | |
385 | * gets removed (and a new entry added), so there's no need to also do | |
386 | * it here. | |
387 | */ | |
388 | ||
389 | ret = __cfg80211_unlink_bss(rdev, oldest); | |
390 | WARN_ON(!ret); | |
391 | return ret; | |
392 | } | |
393 | ||
f9d15d16 JB |
394 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
395 | bool send_message) | |
2a519311 | 396 | { |
667503dd | 397 | struct cfg80211_scan_request *request; |
fd014284 | 398 | struct wireless_dev *wdev; |
f9d15d16 | 399 | struct sk_buff *msg; |
3d23e349 | 400 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
401 | union iwreq_data wrqu; |
402 | #endif | |
403 | ||
5fe231e8 | 404 | ASSERT_RTNL(); |
01a0ac41 | 405 | |
f9d15d16 | 406 | if (rdev->scan_msg) { |
505a2e88 | 407 | nl80211_send_scan_msg(rdev, rdev->scan_msg); |
f9d15d16 JB |
408 | rdev->scan_msg = NULL; |
409 | return; | |
410 | } | |
667503dd | 411 | |
f9d15d16 | 412 | request = rdev->scan_req; |
01a0ac41 JB |
413 | if (!request) |
414 | return; | |
415 | ||
fd014284 | 416 | wdev = request->wdev; |
2a519311 | 417 | |
6829c878 JB |
418 | /* |
419 | * This must be before sending the other events! | |
420 | * Otherwise, wpa_supplicant gets completely confused with | |
421 | * wext events. | |
422 | */ | |
fd014284 JB |
423 | if (wdev->netdev) |
424 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 425 | |
1d76250b | 426 | if (!request->info.aborted && |
f9d15d16 JB |
427 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
428 | /* flush entries from previous scans */ | |
429 | spin_lock_bh(&rdev->bss_lock); | |
430 | __cfg80211_bss_expire(rdev, request->scan_start); | |
431 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 432 | } |
2a519311 | 433 | |
1d76250b | 434 | msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); |
f9d15d16 | 435 | |
3d23e349 | 436 | #ifdef CONFIG_CFG80211_WEXT |
1d76250b | 437 | if (wdev->netdev && !request->info.aborted) { |
2a519311 JB |
438 | memset(&wrqu, 0, sizeof(wrqu)); |
439 | ||
fd014284 | 440 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
441 | } |
442 | #endif | |
443 | ||
fd014284 JB |
444 | if (wdev->netdev) |
445 | dev_put(wdev->netdev); | |
2a519311 | 446 | |
36e6fea8 | 447 | rdev->scan_req = NULL; |
4a58e7c3 | 448 | kfree(request); |
f9d15d16 JB |
449 | |
450 | if (!send_message) | |
451 | rdev->scan_msg = msg; | |
452 | else | |
505a2e88 | 453 | nl80211_send_scan_msg(rdev, msg); |
2a519311 | 454 | } |
667503dd | 455 | |
36e6fea8 JB |
456 | void __cfg80211_scan_done(struct work_struct *wk) |
457 | { | |
458 | struct cfg80211_registered_device *rdev; | |
459 | ||
460 | rdev = container_of(wk, struct cfg80211_registered_device, | |
461 | scan_done_wk); | |
462 | ||
5fe231e8 | 463 | rtnl_lock(); |
f9d15d16 | 464 | ___cfg80211_scan_done(rdev, true); |
5fe231e8 | 465 | rtnl_unlock(); |
36e6fea8 JB |
466 | } |
467 | ||
1d76250b AS |
468 | void cfg80211_scan_done(struct cfg80211_scan_request *request, |
469 | struct cfg80211_scan_info *info) | |
667503dd | 470 | { |
1d76250b | 471 | trace_cfg80211_scan_done(request, info); |
f26cbf40 | 472 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req); |
667503dd | 473 | |
1d76250b | 474 | request->info = *info; |
5fe231e8 | 475 | request->notified = true; |
f26cbf40 | 476 | queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); |
667503dd | 477 | } |
2a519311 JB |
478 | EXPORT_SYMBOL(cfg80211_scan_done); |
479 | ||
ca986ad9 AVS |
480 | void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev, |
481 | struct cfg80211_sched_scan_request *req) | |
482 | { | |
483 | ASSERT_RTNL(); | |
484 | ||
485 | list_add_rcu(&req->list, &rdev->sched_scan_req_list); | |
486 | } | |
487 | ||
488 | static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev, | |
489 | struct cfg80211_sched_scan_request *req) | |
490 | { | |
491 | ASSERT_RTNL(); | |
492 | ||
493 | list_del_rcu(&req->list); | |
494 | kfree_rcu(req, rcu_head); | |
495 | } | |
496 | ||
497 | static struct cfg80211_sched_scan_request * | |
498 | cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid) | |
499 | { | |
500 | struct cfg80211_sched_scan_request *pos; | |
501 | ||
1b57b621 | 502 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); |
ca986ad9 | 503 | |
1b57b621 | 504 | list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list) { |
ca986ad9 AVS |
505 | if (pos->reqid == reqid) |
506 | return pos; | |
507 | } | |
b34939b9 | 508 | return NULL; |
ca986ad9 AVS |
509 | } |
510 | ||
511 | /* | |
512 | * Determines if a scheduled scan request can be handled. When a legacy | |
513 | * scheduled scan is running no other scheduled scan is allowed regardless | |
514 | * whether the request is for legacy or multi-support scan. When a multi-support | |
515 | * scheduled scan is running a request for legacy scan is not allowed. In this | |
516 | * case a request for multi-support scan can be handled if resources are | |
517 | * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached. | |
518 | */ | |
519 | int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev, | |
520 | bool want_multi) | |
521 | { | |
522 | struct cfg80211_sched_scan_request *pos; | |
523 | int i = 0; | |
524 | ||
525 | list_for_each_entry(pos, &rdev->sched_scan_req_list, list) { | |
526 | /* request id zero means legacy in progress */ | |
527 | if (!i && !pos->reqid) | |
528 | return -EINPROGRESS; | |
529 | i++; | |
530 | } | |
531 | ||
532 | if (i) { | |
533 | /* no legacy allowed when multi request(s) are active */ | |
534 | if (!want_multi) | |
535 | return -EINPROGRESS; | |
536 | ||
537 | /* resource limit reached */ | |
538 | if (i == rdev->wiphy.max_sched_scan_reqs) | |
539 | return -ENOSPC; | |
540 | } | |
541 | return 0; | |
542 | } | |
543 | ||
b34939b9 | 544 | void cfg80211_sched_scan_results_wk(struct work_struct *work) |
807f8a8c LC |
545 | { |
546 | struct cfg80211_registered_device *rdev; | |
b34939b9 | 547 | struct cfg80211_sched_scan_request *req, *tmp; |
807f8a8c | 548 | |
b34939b9 AVS |
549 | rdev = container_of(work, struct cfg80211_registered_device, |
550 | sched_scan_res_wk); | |
807f8a8c | 551 | |
5fe231e8 | 552 | rtnl_lock(); |
b34939b9 AVS |
553 | list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { |
554 | if (req->report_results) { | |
555 | req->report_results = false; | |
556 | if (req->flags & NL80211_SCAN_FLAG_FLUSH) { | |
557 | /* flush entries from previous scans */ | |
558 | spin_lock_bh(&rdev->bss_lock); | |
559 | __cfg80211_bss_expire(rdev, req->scan_start); | |
560 | spin_unlock_bh(&rdev->bss_lock); | |
561 | req->scan_start = jiffies; | |
562 | } | |
563 | nl80211_send_sched_scan(req, | |
564 | NL80211_CMD_SCHED_SCAN_RESULTS); | |
15d6030b | 565 | } |
15d6030b | 566 | } |
5fe231e8 | 567 | rtnl_unlock(); |
807f8a8c LC |
568 | } |
569 | ||
b34939b9 | 570 | void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 571 | { |
ca986ad9 AVS |
572 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
573 | struct cfg80211_sched_scan_request *request; | |
574 | ||
b34939b9 | 575 | trace_cfg80211_sched_scan_results(wiphy, reqid); |
807f8a8c | 576 | /* ignore if we're not scanning */ |
31a60ed1 | 577 | |
1b57b621 | 578 | rcu_read_lock(); |
b34939b9 AVS |
579 | request = cfg80211_find_sched_scan_req(rdev, reqid); |
580 | if (request) { | |
581 | request->report_results = true; | |
582 | queue_work(cfg80211_wq, &rdev->sched_scan_res_wk); | |
583 | } | |
1b57b621 | 584 | rcu_read_unlock(); |
807f8a8c LC |
585 | } |
586 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
587 | ||
b34939b9 | 588 | void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 589 | { |
f26cbf40 | 590 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 591 | |
792e6aa7 EP |
592 | ASSERT_RTNL(); |
593 | ||
b34939b9 | 594 | trace_cfg80211_sched_scan_stopped(wiphy, reqid); |
4ee3e063 | 595 | |
b34939b9 | 596 | __cfg80211_stop_sched_scan(rdev, reqid, true); |
792e6aa7 EP |
597 | } |
598 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl); | |
599 | ||
b34939b9 | 600 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid) |
792e6aa7 EP |
601 | { |
602 | rtnl_lock(); | |
b34939b9 | 603 | cfg80211_sched_scan_stopped_rtnl(wiphy, reqid); |
5fe231e8 | 604 | rtnl_unlock(); |
807f8a8c | 605 | } |
807f8a8c LC |
606 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
607 | ||
ca986ad9 AVS |
608 | int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev, |
609 | struct cfg80211_sched_scan_request *req, | |
610 | bool driver_initiated) | |
807f8a8c | 611 | { |
5fe231e8 | 612 | ASSERT_RTNL(); |
807f8a8c | 613 | |
85a9994a | 614 | if (!driver_initiated) { |
3a3ecf1d | 615 | int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid); |
85a9994a LC |
616 | if (err) |
617 | return err; | |
618 | } | |
807f8a8c | 619 | |
ca986ad9 | 620 | nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED); |
807f8a8c | 621 | |
ca986ad9 | 622 | cfg80211_del_sched_scan_req(rdev, req); |
807f8a8c | 623 | |
3b4670ff | 624 | return 0; |
807f8a8c LC |
625 | } |
626 | ||
ca986ad9 AVS |
627 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
628 | u64 reqid, bool driver_initiated) | |
629 | { | |
630 | struct cfg80211_sched_scan_request *sched_scan_req; | |
631 | ||
632 | ASSERT_RTNL(); | |
633 | ||
634 | sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid); | |
b34939b9 AVS |
635 | if (!sched_scan_req) |
636 | return -ENOENT; | |
ca986ad9 AVS |
637 | |
638 | return cfg80211_stop_sched_scan_req(rdev, sched_scan_req, | |
639 | driver_initiated); | |
640 | } | |
641 | ||
1b8ec87a | 642 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
643 | unsigned long age_secs) |
644 | { | |
645 | struct cfg80211_internal_bss *bss; | |
646 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
647 | ||
1b8ec87a ZG |
648 | spin_lock_bh(&rdev->bss_lock); |
649 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 650 | bss->ts -= age_jiffies; |
1b8ec87a | 651 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
652 | } |
653 | ||
1b8ec87a | 654 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 655 | { |
1b8ec87a | 656 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
657 | } |
658 | ||
49a68e0d JB |
659 | const struct element * |
660 | cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len, | |
661 | const u8 *match, unsigned int match_len, | |
662 | unsigned int match_offset) | |
2a519311 | 663 | { |
0f3b07f0 JB |
664 | const struct element *elem; |
665 | ||
0f3b07f0 | 666 | for_each_element_id(elem, eid, ies, len) { |
49a68e0d JB |
667 | if (elem->datalen >= match_offset + match_len && |
668 | !memcmp(elem->data + match_offset, match, match_len)) | |
669 | return elem; | |
2a519311 | 670 | } |
fbd05e4a LC |
671 | |
672 | return NULL; | |
2a519311 | 673 | } |
49a68e0d | 674 | EXPORT_SYMBOL(cfg80211_find_elem_match); |
2a519311 | 675 | |
49a68e0d JB |
676 | const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type, |
677 | const u8 *ies, | |
678 | unsigned int len) | |
0c28ec58 | 679 | { |
49a68e0d | 680 | const struct element *elem; |
fbd05e4a LC |
681 | u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; |
682 | int match_len = (oui_type < 0) ? 3 : sizeof(match); | |
0c28ec58 | 683 | |
9e9ea439 EG |
684 | if (WARN_ON(oui_type > 0xff)) |
685 | return NULL; | |
686 | ||
49a68e0d JB |
687 | elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, |
688 | match, match_len, 0); | |
6719429d | 689 | |
49a68e0d | 690 | if (!elem || elem->datalen < 4) |
fbd05e4a | 691 | return NULL; |
6719429d | 692 | |
49a68e0d | 693 | return elem; |
0c28ec58 | 694 | } |
49a68e0d | 695 | EXPORT_SYMBOL(cfg80211_find_vendor_elem); |
0c28ec58 | 696 | |
4593c4cb JB |
697 | /** |
698 | * enum bss_compare_mode - BSS compare mode | |
699 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
700 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
701 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
702 | */ | |
703 | enum bss_compare_mode { | |
704 | BSS_CMP_REGULAR, | |
705 | BSS_CMP_HIDE_ZLEN, | |
706 | BSS_CMP_HIDE_NUL, | |
707 | }; | |
708 | ||
dd9dfb9f | 709 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 710 | struct cfg80211_bss *b, |
4593c4cb | 711 | enum bss_compare_mode mode) |
dd9dfb9f | 712 | { |
9caf0364 | 713 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
714 | const u8 *ie1 = NULL; |
715 | const u8 *ie2 = NULL; | |
5622f5bb | 716 | int i, r; |
dd9dfb9f | 717 | |
3af6341c JB |
718 | if (a->channel != b->channel) |
719 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 720 | |
9caf0364 JB |
721 | a_ies = rcu_access_pointer(a->ies); |
722 | if (!a_ies) | |
723 | return -1; | |
724 | b_ies = rcu_access_pointer(b->ies); | |
725 | if (!b_ies) | |
726 | return 1; | |
727 | ||
3af6341c JB |
728 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
729 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
730 | a_ies->data, a_ies->len); | |
731 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
732 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
733 | b_ies->data, b_ies->len); | |
734 | if (ie1 && ie2) { | |
735 | int mesh_id_cmp; | |
736 | ||
737 | if (ie1[1] == ie2[1]) | |
738 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
739 | else | |
740 | mesh_id_cmp = ie2[1] - ie1[1]; | |
741 | ||
742 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
743 | a_ies->data, a_ies->len); | |
744 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
745 | b_ies->data, b_ies->len); | |
746 | if (ie1 && ie2) { | |
747 | if (mesh_id_cmp) | |
748 | return mesh_id_cmp; | |
749 | if (ie1[1] != ie2[1]) | |
750 | return ie2[1] - ie1[1]; | |
751 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
752 | } | |
753 | } | |
754 | ||
3af6341c JB |
755 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
756 | if (r) | |
757 | return r; | |
758 | ||
9caf0364 JB |
759 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
760 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 761 | |
5622f5bb JB |
762 | if (!ie1 && !ie2) |
763 | return 0; | |
764 | ||
f94f8b16 | 765 | /* |
5622f5bb JB |
766 | * Note that with "hide_ssid", the function returns a match if |
767 | * the already-present BSS ("b") is a hidden SSID beacon for | |
768 | * the new BSS ("a"). | |
f94f8b16 | 769 | */ |
dd9dfb9f DT |
770 | |
771 | /* sort missing IE before (left of) present IE */ | |
772 | if (!ie1) | |
773 | return -1; | |
774 | if (!ie2) | |
775 | return 1; | |
776 | ||
4593c4cb JB |
777 | switch (mode) { |
778 | case BSS_CMP_HIDE_ZLEN: | |
779 | /* | |
780 | * In ZLEN mode we assume the BSS entry we're | |
781 | * looking for has a zero-length SSID. So if | |
782 | * the one we're looking at right now has that, | |
783 | * return 0. Otherwise, return the difference | |
784 | * in length, but since we're looking for the | |
785 | * 0-length it's really equivalent to returning | |
786 | * the length of the one we're looking at. | |
787 | * | |
788 | * No content comparison is needed as we assume | |
789 | * the content length is zero. | |
790 | */ | |
791 | return ie2[1]; | |
792 | case BSS_CMP_REGULAR: | |
793 | default: | |
794 | /* sort by length first, then by contents */ | |
795 | if (ie1[1] != ie2[1]) | |
796 | return ie2[1] - ie1[1]; | |
5622f5bb | 797 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
798 | case BSS_CMP_HIDE_NUL: |
799 | if (ie1[1] != ie2[1]) | |
800 | return ie2[1] - ie1[1]; | |
801 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
802 | for (i = 0; i < ie2[1]; i++) | |
803 | if (ie2[i + 2]) | |
804 | return -1; | |
805 | return 0; | |
806 | } | |
dd9dfb9f DT |
807 | } |
808 | ||
6eb18137 | 809 | static bool cfg80211_bss_type_match(u16 capability, |
57fbcce3 | 810 | enum nl80211_band band, |
6eb18137 DL |
811 | enum ieee80211_bss_type bss_type) |
812 | { | |
813 | bool ret = true; | |
814 | u16 mask, val; | |
815 | ||
816 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
817 | return ret; | |
818 | ||
57fbcce3 | 819 | if (band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
820 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
821 | switch (bss_type) { | |
822 | case IEEE80211_BSS_TYPE_ESS: | |
823 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
824 | break; | |
825 | case IEEE80211_BSS_TYPE_PBSS: | |
826 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
827 | break; | |
828 | case IEEE80211_BSS_TYPE_IBSS: | |
829 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
830 | break; | |
831 | default: | |
832 | return false; | |
833 | } | |
834 | } else { | |
835 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
836 | switch (bss_type) { | |
837 | case IEEE80211_BSS_TYPE_ESS: | |
838 | val = WLAN_CAPABILITY_ESS; | |
839 | break; | |
840 | case IEEE80211_BSS_TYPE_IBSS: | |
841 | val = WLAN_CAPABILITY_IBSS; | |
842 | break; | |
843 | case IEEE80211_BSS_TYPE_MBSS: | |
844 | val = 0; | |
845 | break; | |
846 | default: | |
847 | return false; | |
848 | } | |
849 | } | |
850 | ||
851 | ret = ((capability & mask) == val); | |
852 | return ret; | |
853 | } | |
854 | ||
0e3a39b5 | 855 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 JB |
856 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
857 | struct ieee80211_channel *channel, | |
858 | const u8 *bssid, | |
79420f09 | 859 | const u8 *ssid, size_t ssid_len, |
6eb18137 DL |
860 | enum ieee80211_bss_type bss_type, |
861 | enum ieee80211_privacy privacy) | |
2a519311 | 862 | { |
f26cbf40 | 863 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 864 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 865 | unsigned long now = jiffies; |
6eb18137 | 866 | int bss_privacy; |
2a519311 | 867 | |
6eb18137 DL |
868 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
869 | privacy); | |
4ee3e063 | 870 | |
1b8ec87a | 871 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 872 | |
1b8ec87a | 873 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
874 | if (!cfg80211_bss_type_match(bss->pub.capability, |
875 | bss->pub.channel->band, bss_type)) | |
876 | continue; | |
877 | ||
878 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
879 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
880 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 881 | continue; |
2a519311 JB |
882 | if (channel && bss->pub.channel != channel) |
883 | continue; | |
c14a7400 JB |
884 | if (!is_valid_ether_addr(bss->pub.bssid)) |
885 | continue; | |
ccb6c136 JB |
886 | /* Don't get expired BSS structs */ |
887 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
888 | !atomic_read(&bss->hold)) | |
889 | continue; | |
2a519311 JB |
890 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
891 | res = bss; | |
1b8ec87a | 892 | bss_ref_get(rdev, res); |
2a519311 JB |
893 | break; |
894 | } | |
895 | } | |
896 | ||
1b8ec87a | 897 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
898 | if (!res) |
899 | return NULL; | |
4ee3e063 | 900 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
901 | return &res->pub; |
902 | } | |
903 | EXPORT_SYMBOL(cfg80211_get_bss); | |
904 | ||
1b8ec87a | 905 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
906 | struct cfg80211_internal_bss *bss) |
907 | { | |
1b8ec87a | 908 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
909 | struct rb_node *parent = NULL; |
910 | struct cfg80211_internal_bss *tbss; | |
911 | int cmp; | |
912 | ||
913 | while (*p) { | |
914 | parent = *p; | |
915 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
916 | ||
4593c4cb | 917 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
918 | |
919 | if (WARN_ON(!cmp)) { | |
920 | /* will sort of leak this BSS */ | |
921 | return; | |
922 | } | |
923 | ||
924 | if (cmp < 0) | |
925 | p = &(*p)->rb_left; | |
926 | else | |
927 | p = &(*p)->rb_right; | |
928 | } | |
929 | ||
930 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 931 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
932 | } |
933 | ||
934 | static struct cfg80211_internal_bss * | |
1b8ec87a | 935 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 936 | struct cfg80211_internal_bss *res, |
4593c4cb | 937 | enum bss_compare_mode mode) |
dd9dfb9f | 938 | { |
1b8ec87a | 939 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
940 | struct cfg80211_internal_bss *bss; |
941 | int r; | |
942 | ||
943 | while (n) { | |
944 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 945 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
946 | |
947 | if (r == 0) | |
948 | return bss; | |
949 | else if (r < 0) | |
950 | n = n->rb_left; | |
951 | else | |
952 | n = n->rb_right; | |
953 | } | |
954 | ||
955 | return NULL; | |
956 | } | |
957 | ||
1b8ec87a | 958 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 959 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 960 | { |
9caf0364 | 961 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
962 | struct cfg80211_internal_bss *bss; |
963 | const u8 *ie; | |
964 | int i, ssidlen; | |
965 | u8 fold = 0; | |
9853a55e | 966 | u32 n_entries = 0; |
9caf0364 | 967 | |
776b3580 | 968 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 969 | if (WARN_ON(!ies)) |
776b3580 | 970 | return false; |
dd9dfb9f | 971 | |
776b3580 JB |
972 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
973 | if (!ie) { | |
974 | /* nothing to do */ | |
975 | return true; | |
976 | } | |
977 | ||
978 | ssidlen = ie[1]; | |
979 | for (i = 0; i < ssidlen; i++) | |
980 | fold |= ie[2 + i]; | |
981 | ||
982 | if (fold) { | |
983 | /* not a hidden SSID */ | |
984 | return true; | |
985 | } | |
986 | ||
987 | /* This is the bad part ... */ | |
988 | ||
1b8ec87a | 989 | list_for_each_entry(bss, &rdev->bss_list, list) { |
9853a55e JB |
990 | /* |
991 | * we're iterating all the entries anyway, so take the | |
992 | * opportunity to validate the list length accounting | |
993 | */ | |
994 | n_entries++; | |
995 | ||
776b3580 JB |
996 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
997 | continue; | |
998 | if (bss->pub.channel != new->pub.channel) | |
999 | continue; | |
dcd6eac1 SW |
1000 | if (bss->pub.scan_width != new->pub.scan_width) |
1001 | continue; | |
776b3580 JB |
1002 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
1003 | continue; | |
1004 | ies = rcu_access_pointer(bss->pub.ies); | |
1005 | if (!ies) | |
1006 | continue; | |
1007 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
1008 | if (!ie) | |
1009 | continue; | |
1010 | if (ssidlen && ie[1] != ssidlen) | |
1011 | continue; | |
776b3580 JB |
1012 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
1013 | continue; | |
1014 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
1015 | list_del(&bss->hidden_list); | |
1016 | /* combine them */ | |
1017 | list_add(&bss->hidden_list, &new->hidden_list); | |
1018 | bss->pub.hidden_beacon_bss = &new->pub; | |
1019 | new->refcount += bss->refcount; | |
1020 | rcu_assign_pointer(bss->pub.beacon_ies, | |
1021 | new->pub.beacon_ies); | |
1022 | } | |
1023 | ||
9853a55e JB |
1024 | WARN_ONCE(n_entries != rdev->bss_entries, |
1025 | "rdev bss entries[%d]/list[len:%d] corruption\n", | |
1026 | rdev->bss_entries, n_entries); | |
1027 | ||
776b3580 | 1028 | return true; |
dd9dfb9f DT |
1029 | } |
1030 | ||
0cd01efb SS |
1031 | struct cfg80211_non_tx_bss { |
1032 | struct cfg80211_bss *tx_bss; | |
1033 | u8 max_bssid_indicator; | |
1034 | u8 bssid_index; | |
1035 | }; | |
1036 | ||
0e3a39b5 | 1037 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 | 1038 | static struct cfg80211_internal_bss * |
1b8ec87a | 1039 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
3afc2167 EG |
1040 | struct cfg80211_internal_bss *tmp, |
1041 | bool signal_valid) | |
2a519311 JB |
1042 | { |
1043 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 1044 | |
9caf0364 | 1045 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 1046 | return NULL; |
2a519311 | 1047 | |
9caf0364 | 1048 | tmp->ts = jiffies; |
2a519311 | 1049 | |
1b8ec87a | 1050 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 1051 | |
9caf0364 | 1052 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
1b8ec87a | 1053 | spin_unlock_bh(&rdev->bss_lock); |
9caf0364 JB |
1054 | return NULL; |
1055 | } | |
1056 | ||
1b8ec87a | 1057 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 1058 | |
cd1658f5 | 1059 | if (found) { |
34a6eddb | 1060 | /* Update IEs */ |
9caf0364 JB |
1061 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
1062 | const struct cfg80211_bss_ies *old; | |
1063 | ||
1064 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 1065 | |
9caf0364 JB |
1066 | rcu_assign_pointer(found->pub.proberesp_ies, |
1067 | tmp->pub.proberesp_ies); | |
34a6eddb | 1068 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
1069 | rcu_assign_pointer(found->pub.ies, |
1070 | tmp->pub.proberesp_ies); | |
1071 | if (old) | |
1072 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
1073 | rcu_head); | |
1074 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
9537f227 | 1075 | const struct cfg80211_bss_ies *old; |
776b3580 JB |
1076 | struct cfg80211_internal_bss *bss; |
1077 | ||
1078 | if (found->pub.hidden_beacon_bss && | |
1079 | !list_empty(&found->hidden_list)) { | |
1345ee6a JB |
1080 | const struct cfg80211_bss_ies *f; |
1081 | ||
776b3580 JB |
1082 | /* |
1083 | * The found BSS struct is one of the probe | |
1084 | * response members of a group, but we're | |
1085 | * receiving a beacon (beacon_ies in the tmp | |
1086 | * bss is used). This can only mean that the | |
1087 | * AP changed its beacon from not having an | |
1088 | * SSID to showing it, which is confusing so | |
1089 | * drop this information. | |
1090 | */ | |
1345ee6a JB |
1091 | |
1092 | f = rcu_access_pointer(tmp->pub.beacon_ies); | |
1093 | kfree_rcu((struct cfg80211_bss_ies *)f, | |
1094 | rcu_head); | |
776b3580 JB |
1095 | goto drop; |
1096 | } | |
915de2ff | 1097 | |
9caf0364 | 1098 | old = rcu_access_pointer(found->pub.beacon_ies); |
9caf0364 JB |
1099 | |
1100 | rcu_assign_pointer(found->pub.beacon_ies, | |
1101 | tmp->pub.beacon_ies); | |
01123e23 SN |
1102 | |
1103 | /* Override IEs if they were from a beacon before */ | |
9537f227 | 1104 | if (old == rcu_access_pointer(found->pub.ies)) |
9caf0364 JB |
1105 | rcu_assign_pointer(found->pub.ies, |
1106 | tmp->pub.beacon_ies); | |
cd1658f5 | 1107 | |
776b3580 JB |
1108 | /* Assign beacon IEs to all sub entries */ |
1109 | list_for_each_entry(bss, &found->hidden_list, | |
1110 | hidden_list) { | |
1111 | const struct cfg80211_bss_ies *ies; | |
1112 | ||
1113 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
1114 | WARN_ON(ies != old); | |
1115 | ||
1116 | rcu_assign_pointer(bss->pub.beacon_ies, | |
1117 | tmp->pub.beacon_ies); | |
1118 | } | |
1119 | ||
9caf0364 JB |
1120 | if (old) |
1121 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
1122 | rcu_head); | |
1123 | } | |
1345ee6a JB |
1124 | |
1125 | found->pub.beacon_interval = tmp->pub.beacon_interval; | |
3afc2167 EG |
1126 | /* |
1127 | * don't update the signal if beacon was heard on | |
1128 | * adjacent channel. | |
1129 | */ | |
1130 | if (signal_valid) | |
1131 | found->pub.signal = tmp->pub.signal; | |
1345ee6a JB |
1132 | found->pub.capability = tmp->pub.capability; |
1133 | found->ts = tmp->ts; | |
6e19bc4b | 1134 | found->ts_boottime = tmp->ts_boottime; |
1d76250b | 1135 | found->parent_tsf = tmp->parent_tsf; |
983dafaa SD |
1136 | found->pub.chains = tmp->pub.chains; |
1137 | memcpy(found->pub.chain_signal, tmp->pub.chain_signal, | |
1138 | IEEE80211_MAX_CHAINS); | |
1d76250b | 1139 | ether_addr_copy(found->parent_bssid, tmp->parent_bssid); |
0cd01efb SS |
1140 | found->pub.max_bssid_indicator = tmp->pub.max_bssid_indicator; |
1141 | found->pub.bssid_index = tmp->pub.bssid_index; | |
2a519311 | 1142 | } else { |
9caf0364 | 1143 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 1144 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 1145 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 1146 | |
9caf0364 JB |
1147 | /* |
1148 | * create a copy -- the "res" variable that is passed in | |
1149 | * is allocated on the stack since it's not needed in the | |
1150 | * more common case of an update | |
1151 | */ | |
1b8ec87a | 1152 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
1153 | GFP_ATOMIC); |
1154 | if (!new) { | |
1155 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
1156 | if (ies) | |
1157 | kfree_rcu(ies, rcu_head); | |
1158 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
1159 | if (ies) | |
1160 | kfree_rcu(ies, rcu_head); | |
776b3580 | 1161 | goto drop; |
9caf0364 JB |
1162 | } |
1163 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
1164 | new->refcount = 1; |
1165 | INIT_LIST_HEAD(&new->hidden_list); | |
7011ba58 | 1166 | INIT_LIST_HEAD(&new->pub.nontrans_list); |
776b3580 JB |
1167 | |
1168 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 1169 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 1170 | if (!hidden) |
1b8ec87a | 1171 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
1172 | BSS_CMP_HIDE_NUL); |
1173 | if (hidden) { | |
1174 | new->pub.hidden_beacon_bss = &hidden->pub; | |
1175 | list_add(&new->hidden_list, | |
1176 | &hidden->hidden_list); | |
1177 | hidden->refcount++; | |
1178 | rcu_assign_pointer(new->pub.beacon_ies, | |
1179 | hidden->pub.beacon_ies); | |
1180 | } | |
1181 | } else { | |
1182 | /* | |
1183 | * Ok so we found a beacon, and don't have an entry. If | |
1184 | * it's a beacon with hidden SSID, we might be in for an | |
1185 | * expensive search for any probe responses that should | |
1186 | * be grouped with this beacon for updates ... | |
1187 | */ | |
1b8ec87a | 1188 | if (!cfg80211_combine_bsses(rdev, new)) { |
776b3580 JB |
1189 | kfree(new); |
1190 | goto drop; | |
1191 | } | |
1192 | } | |
1193 | ||
9853a55e JB |
1194 | if (rdev->bss_entries >= bss_entries_limit && |
1195 | !cfg80211_bss_expire_oldest(rdev)) { | |
1196 | kfree(new); | |
1197 | goto drop; | |
1198 | } | |
1199 | ||
a3584f56 | 1200 | /* This must be before the call to bss_ref_get */ |
0cd01efb | 1201 | if (tmp->pub.transmitted_bss) { |
a3584f56 | 1202 | struct cfg80211_internal_bss *pbss = |
0cd01efb | 1203 | container_of(tmp->pub.transmitted_bss, |
a3584f56 SS |
1204 | struct cfg80211_internal_bss, |
1205 | pub); | |
1206 | ||
0cd01efb | 1207 | new->pub.transmitted_bss = tmp->pub.transmitted_bss; |
a3584f56 SS |
1208 | bss_ref_get(rdev, pbss); |
1209 | } | |
1210 | ||
1b8ec87a | 1211 | list_add_tail(&new->list, &rdev->bss_list); |
9853a55e | 1212 | rdev->bss_entries++; |
1b8ec87a | 1213 | rb_insert_bss(rdev, new); |
9caf0364 | 1214 | found = new; |
2a519311 JB |
1215 | } |
1216 | ||
1b8ec87a ZG |
1217 | rdev->bss_generation++; |
1218 | bss_ref_get(rdev, found); | |
1219 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 | 1220 | |
2a519311 | 1221 | return found; |
776b3580 | 1222 | drop: |
1b8ec87a | 1223 | spin_unlock_bh(&rdev->bss_lock); |
776b3580 | 1224 | return NULL; |
2a519311 JB |
1225 | } |
1226 | ||
119f94a6 JM |
1227 | /* |
1228 | * Update RX channel information based on the available frame payload | |
1229 | * information. This is mainly for the 2.4 GHz band where frames can be received | |
1230 | * from neighboring channels and the Beacon frames use the DSSS Parameter Set | |
1231 | * element to indicate the current (transmitting) channel, but this might also | |
1232 | * be needed on other bands if RX frequency does not match with the actual | |
1233 | * operating channel of a BSS. | |
1234 | */ | |
0172bb75 JB |
1235 | static struct ieee80211_channel * |
1236 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
119f94a6 JM |
1237 | struct ieee80211_channel *channel, |
1238 | enum nl80211_bss_scan_width scan_width) | |
0172bb75 JB |
1239 | { |
1240 | const u8 *tmp; | |
1241 | u32 freq; | |
1242 | int channel_number = -1; | |
119f94a6 | 1243 | struct ieee80211_channel *alt_channel; |
0172bb75 JB |
1244 | |
1245 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
1246 | if (tmp && tmp[1] == 1) { | |
1247 | channel_number = tmp[2]; | |
1248 | } else { | |
1249 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
1250 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
1251 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
1252 | ||
1253 | channel_number = htop->primary_chan; | |
1254 | } | |
1255 | } | |
1256 | ||
119f94a6 JM |
1257 | if (channel_number < 0) { |
1258 | /* No channel information in frame payload */ | |
0172bb75 | 1259 | return channel; |
119f94a6 | 1260 | } |
0172bb75 JB |
1261 | |
1262 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
119f94a6 JM |
1263 | alt_channel = ieee80211_get_channel(wiphy, freq); |
1264 | if (!alt_channel) { | |
1265 | if (channel->band == NL80211_BAND_2GHZ) { | |
1266 | /* | |
1267 | * Better not allow unexpected channels when that could | |
1268 | * be going beyond the 1-11 range (e.g., discovering | |
1269 | * BSS on channel 12 when radio is configured for | |
1270 | * channel 11. | |
1271 | */ | |
1272 | return NULL; | |
1273 | } | |
1274 | ||
1275 | /* No match for the payload channel number - ignore it */ | |
1276 | return channel; | |
1277 | } | |
1278 | ||
1279 | if (scan_width == NL80211_BSS_CHAN_WIDTH_10 || | |
1280 | scan_width == NL80211_BSS_CHAN_WIDTH_5) { | |
1281 | /* | |
1282 | * Ignore channel number in 5 and 10 MHz channels where there | |
1283 | * may not be an n:1 or 1:n mapping between frequencies and | |
1284 | * channel numbers. | |
1285 | */ | |
1286 | return channel; | |
1287 | } | |
1288 | ||
1289 | /* | |
1290 | * Use the channel determined through the payload channel number | |
1291 | * instead of the RX channel reported by the driver. | |
1292 | */ | |
1293 | if (alt_channel->flags & IEEE80211_CHAN_DISABLED) | |
0172bb75 | 1294 | return NULL; |
119f94a6 | 1295 | return alt_channel; |
0172bb75 JB |
1296 | } |
1297 | ||
0e3a39b5 | 1298 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
0b8fb823 PX |
1299 | static struct cfg80211_bss * |
1300 | cfg80211_inform_single_bss_data(struct wiphy *wiphy, | |
1301 | struct cfg80211_inform_bss *data, | |
1302 | enum cfg80211_bss_frame_type ftype, | |
1303 | const u8 *bssid, u64 tsf, u16 capability, | |
1304 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
0cd01efb | 1305 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 | 1306 | gfp_t gfp) |
06aa7afa | 1307 | { |
0b8fb823 | 1308 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
9caf0364 | 1309 | struct cfg80211_bss_ies *ies; |
3afc2167 | 1310 | struct ieee80211_channel *channel; |
7011ba58 | 1311 | struct cfg80211_internal_bss tmp = {}, *res; |
6eb18137 | 1312 | int bss_type; |
67af9811 | 1313 | bool signal_valid; |
06aa7afa JK |
1314 | |
1315 | if (WARN_ON(!wiphy)) | |
1316 | return NULL; | |
1317 | ||
22fe88d3 | 1318 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1319 | (data->signal < 0 || data->signal > 100))) |
06aa7afa JK |
1320 | return NULL; |
1321 | ||
119f94a6 JM |
1322 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan, |
1323 | data->scan_width); | |
0172bb75 JB |
1324 | if (!channel) |
1325 | return NULL; | |
1326 | ||
9caf0364 JB |
1327 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
1328 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1329 | tmp.pub.scan_width = data->scan_width; |
1330 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1331 | tmp.pub.beacon_interval = beacon_interval; |
1332 | tmp.pub.capability = capability; | |
6e19bc4b | 1333 | tmp.ts_boottime = data->boottime_ns; |
0cd01efb SS |
1334 | if (non_tx_data) { |
1335 | tmp.pub.transmitted_bss = non_tx_data->tx_bss; | |
1336 | tmp.pub.bssid_index = non_tx_data->bssid_index; | |
1337 | tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator; | |
1338 | } | |
6e19bc4b | 1339 | |
34a6eddb | 1340 | /* |
5bc8c1f2 | 1341 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
1342 | * Response frame, we need to pick one of the options and only use it |
1343 | * with the driver that does not provide the full Beacon/Probe Response | |
1344 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 1345 | * override the IEs pointer should we have received an earlier |
9caf0364 | 1346 | * indication of Probe Response data. |
34a6eddb | 1347 | */ |
0e227084 | 1348 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 JB |
1349 | if (!ies) |
1350 | return NULL; | |
1351 | ies->len = ielen; | |
8cef2c9d | 1352 | ies->tsf = tsf; |
0e227084 | 1353 | ies->from_beacon = false; |
9caf0364 | 1354 | memcpy(ies->data, ie, ielen); |
06aa7afa | 1355 | |
5bc8c1f2 JB |
1356 | switch (ftype) { |
1357 | case CFG80211_BSS_FTYPE_BEACON: | |
1358 | ies->from_beacon = true; | |
925b5978 | 1359 | /* fall through */ |
5bc8c1f2 JB |
1360 | case CFG80211_BSS_FTYPE_UNKNOWN: |
1361 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1362 | break; | |
1363 | case CFG80211_BSS_FTYPE_PRESP: | |
1364 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1365 | break; | |
1366 | } | |
9caf0364 | 1367 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 1368 | |
6e19bc4b | 1369 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 | 1370 | wiphy->max_adj_channel_rssi_comp; |
0cd01efb | 1371 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); |
06aa7afa JK |
1372 | if (!res) |
1373 | return NULL; | |
1374 | ||
57fbcce3 | 1375 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1376 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1377 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1378 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1379 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1380 | } else { | |
1381 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1382 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1383 | } | |
06aa7afa | 1384 | |
0cd01efb | 1385 | if (non_tx_data && non_tx_data->tx_bss) { |
0b8fb823 PX |
1386 | /* this is a nontransmitting bss, we need to add it to |
1387 | * transmitting bss' list if it is not there | |
1388 | */ | |
0cd01efb SS |
1389 | if (cfg80211_add_nontrans_list(non_tx_data->tx_bss, |
1390 | &res->pub)) { | |
0b8fb823 PX |
1391 | if (__cfg80211_unlink_bss(rdev, res)) |
1392 | rdev->bss_generation++; | |
1393 | } | |
1394 | } | |
1395 | ||
4ee3e063 | 1396 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
1397 | /* cfg80211_bss_update gives us a referenced result */ |
1398 | return &res->pub; | |
1399 | } | |
06aa7afa | 1400 | |
0b8fb823 PX |
1401 | static void cfg80211_parse_mbssid_data(struct wiphy *wiphy, |
1402 | struct cfg80211_inform_bss *data, | |
1403 | enum cfg80211_bss_frame_type ftype, | |
1404 | const u8 *bssid, u64 tsf, | |
1405 | u16 beacon_interval, const u8 *ie, | |
1406 | size_t ielen, | |
0cd01efb | 1407 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 PX |
1408 | gfp_t gfp) |
1409 | { | |
1c8745f3 JB |
1410 | const u8 *mbssid_index_ie; |
1411 | const struct element *elem, *sub; | |
1412 | size_t new_ie_len; | |
0b8fb823 PX |
1413 | u8 new_bssid[ETH_ALEN]; |
1414 | u8 *new_ie; | |
1415 | u16 capability; | |
1416 | struct cfg80211_bss *bss; | |
1417 | ||
0cd01efb | 1418 | if (!non_tx_data) |
0b8fb823 PX |
1419 | return; |
1420 | if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen)) | |
1421 | return; | |
213ed579 SS |
1422 | if (!wiphy->support_mbssid) |
1423 | return; | |
1424 | if (wiphy->support_only_he_mbssid && | |
1425 | !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen)) | |
1426 | return; | |
0b8fb823 | 1427 | |
0b8fb823 PX |
1428 | new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); |
1429 | if (!new_ie) | |
1430 | return; | |
1431 | ||
1c8745f3 JB |
1432 | for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) { |
1433 | if (elem->datalen < 4) | |
1434 | continue; | |
1435 | for_each_element(sub, elem->data + 1, elem->datalen - 1) { | |
1436 | if (sub->id != 0 || sub->datalen < 4) { | |
0b8fb823 PX |
1437 | /* not a valid BSS profile */ |
1438 | continue; | |
1439 | } | |
1440 | ||
1c8745f3 JB |
1441 | if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP || |
1442 | sub->data[1] != 2) { | |
0b8fb823 PX |
1443 | /* The first element within the Nontransmitted |
1444 | * BSSID Profile is not the Nontransmitted | |
1445 | * BSSID Capability element. | |
1446 | */ | |
1447 | continue; | |
1448 | } | |
1449 | ||
1450 | /* found a Nontransmitted BSSID Profile */ | |
1451 | mbssid_index_ie = cfg80211_find_ie | |
1452 | (WLAN_EID_MULTI_BSSID_IDX, | |
1c8745f3 | 1453 | sub->data, sub->datalen); |
0b8fb823 PX |
1454 | if (!mbssid_index_ie || mbssid_index_ie[1] < 1 || |
1455 | mbssid_index_ie[2] == 0) { | |
1456 | /* No valid Multiple BSSID-Index element */ | |
1457 | continue; | |
1458 | } | |
1459 | ||
0cd01efb SS |
1460 | non_tx_data->bssid_index = mbssid_index_ie[2]; |
1461 | non_tx_data->max_bssid_indicator = elem->data[0]; | |
1462 | ||
1463 | cfg80211_gen_new_bssid(bssid, | |
1464 | non_tx_data->max_bssid_indicator, | |
1465 | non_tx_data->bssid_index, | |
0b8fb823 PX |
1466 | new_bssid); |
1467 | memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); | |
1c8745f3 JB |
1468 | new_ie_len = cfg80211_gen_new_ie(ie, ielen, sub->data, |
1469 | sub->datalen, new_ie, | |
0b8fb823 PX |
1470 | gfp); |
1471 | if (!new_ie_len) | |
1472 | continue; | |
1473 | ||
1c8745f3 | 1474 | capability = get_unaligned_le16(sub->data + 2); |
0b8fb823 PX |
1475 | bss = cfg80211_inform_single_bss_data(wiphy, data, |
1476 | ftype, | |
1477 | new_bssid, tsf, | |
1478 | capability, | |
1479 | beacon_interval, | |
1480 | new_ie, | |
1481 | new_ie_len, | |
0cd01efb SS |
1482 | non_tx_data, |
1483 | gfp); | |
0b8fb823 PX |
1484 | if (!bss) |
1485 | break; | |
1486 | cfg80211_put_bss(wiphy, bss); | |
1487 | } | |
0b8fb823 PX |
1488 | } |
1489 | ||
1490 | kfree(new_ie); | |
1491 | } | |
1492 | ||
2a519311 | 1493 | struct cfg80211_bss * |
0b8fb823 PX |
1494 | cfg80211_inform_bss_data(struct wiphy *wiphy, |
1495 | struct cfg80211_inform_bss *data, | |
1496 | enum cfg80211_bss_frame_type ftype, | |
1497 | const u8 *bssid, u64 tsf, u16 capability, | |
1498 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
1499 | gfp_t gfp) | |
1500 | { | |
1501 | struct cfg80211_bss *res; | |
0cd01efb | 1502 | struct cfg80211_non_tx_bss non_tx_data; |
0b8fb823 PX |
1503 | |
1504 | res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf, | |
1505 | capability, beacon_interval, ie, | |
1506 | ielen, NULL, gfp); | |
0cd01efb | 1507 | non_tx_data.tx_bss = res; |
0b8fb823 | 1508 | cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf, |
0cd01efb SS |
1509 | beacon_interval, ie, ielen, &non_tx_data, |
1510 | gfp); | |
0b8fb823 PX |
1511 | return res; |
1512 | } | |
1513 | EXPORT_SYMBOL(cfg80211_inform_bss_data); | |
1514 | ||
1515 | static void | |
1516 | cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy, | |
1517 | struct cfg80211_inform_bss *data, | |
1518 | struct ieee80211_mgmt *mgmt, size_t len, | |
0cd01efb | 1519 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 PX |
1520 | gfp_t gfp) |
1521 | { | |
1522 | enum cfg80211_bss_frame_type ftype; | |
1523 | const u8 *ie = mgmt->u.probe_resp.variable; | |
1524 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
1525 | u.probe_resp.variable); | |
1526 | ||
1527 | ftype = ieee80211_is_beacon(mgmt->frame_control) ? | |
1528 | CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP; | |
1529 | ||
1530 | cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid, | |
1531 | le64_to_cpu(mgmt->u.probe_resp.timestamp), | |
1532 | le16_to_cpu(mgmt->u.probe_resp.beacon_int), | |
0cd01efb | 1533 | ie, ielen, non_tx_data, gfp); |
0b8fb823 PX |
1534 | } |
1535 | ||
1536 | static void | |
1537 | cfg80211_update_notlisted_nontrans(struct wiphy *wiphy, | |
7011ba58 | 1538 | struct cfg80211_bss *nontrans_bss, |
0b8fb823 PX |
1539 | struct ieee80211_mgmt *mgmt, size_t len, |
1540 | gfp_t gfp) | |
1541 | { | |
1542 | u8 *ie, *new_ie, *pos; | |
1543 | const u8 *nontrans_ssid, *trans_ssid, *mbssid; | |
1544 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
1545 | u.probe_resp.variable); | |
1546 | size_t new_ie_len; | |
1547 | struct cfg80211_bss_ies *new_ies; | |
1548 | const struct cfg80211_bss_ies *old; | |
1549 | u8 cpy_len; | |
1550 | ||
1551 | ie = mgmt->u.probe_resp.variable; | |
1552 | ||
1553 | new_ie_len = ielen; | |
1554 | trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen); | |
1555 | if (!trans_ssid) | |
1556 | return; | |
1557 | new_ie_len -= trans_ssid[1]; | |
1558 | mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen); | |
1559 | if (!mbssid) | |
1560 | return; | |
1561 | new_ie_len -= mbssid[1]; | |
1562 | rcu_read_lock(); | |
7011ba58 | 1563 | nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID); |
0b8fb823 PX |
1564 | if (!nontrans_ssid) { |
1565 | rcu_read_unlock(); | |
1566 | return; | |
1567 | } | |
1568 | new_ie_len += nontrans_ssid[1]; | |
1569 | rcu_read_unlock(); | |
1570 | ||
1571 | /* generate new ie for nontrans BSS | |
1572 | * 1. replace SSID with nontrans BSS' SSID | |
1573 | * 2. skip MBSSID IE | |
1574 | */ | |
1575 | new_ie = kzalloc(new_ie_len, gfp); | |
1576 | if (!new_ie) | |
1577 | return; | |
1578 | new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, gfp); | |
bede8d29 SS |
1579 | if (!new_ies) |
1580 | goto out_free; | |
0b8fb823 PX |
1581 | |
1582 | pos = new_ie; | |
1583 | ||
1584 | /* copy the nontransmitted SSID */ | |
1585 | cpy_len = nontrans_ssid[1] + 2; | |
1586 | memcpy(pos, nontrans_ssid, cpy_len); | |
1587 | pos += cpy_len; | |
1588 | /* copy the IEs between SSID and MBSSID */ | |
1589 | cpy_len = trans_ssid[1] + 2; | |
1590 | memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len))); | |
1591 | pos += (mbssid - (trans_ssid + cpy_len)); | |
1592 | /* copy the IEs after MBSSID */ | |
1593 | cpy_len = mbssid[1] + 2; | |
1594 | memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len))); | |
1595 | ||
1596 | /* update ie */ | |
1597 | new_ies->len = new_ie_len; | |
1598 | new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
1599 | new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); | |
1600 | memcpy(new_ies->data, new_ie, new_ie_len); | |
1601 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { | |
7011ba58 SS |
1602 | old = rcu_access_pointer(nontrans_bss->proberesp_ies); |
1603 | rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies); | |
1604 | rcu_assign_pointer(nontrans_bss->ies, new_ies); | |
0b8fb823 PX |
1605 | if (old) |
1606 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1607 | } else { | |
7011ba58 SS |
1608 | old = rcu_access_pointer(nontrans_bss->beacon_ies); |
1609 | rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies); | |
1610 | rcu_assign_pointer(nontrans_bss->ies, new_ies); | |
0b8fb823 PX |
1611 | if (old) |
1612 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1613 | } | |
bede8d29 SS |
1614 | |
1615 | out_free: | |
1616 | kfree(new_ie); | |
0b8fb823 | 1617 | } |
6e19bc4b | 1618 | |
0b8fb823 PX |
1619 | /* cfg80211_inform_bss_width_frame helper */ |
1620 | static struct cfg80211_bss * | |
1621 | cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy, | |
1622 | struct cfg80211_inform_bss *data, | |
1623 | struct ieee80211_mgmt *mgmt, size_t len, | |
0cd01efb | 1624 | struct cfg80211_non_tx_bss *non_tx_data, |
0b8fb823 | 1625 | gfp_t gfp) |
2a519311 | 1626 | { |
9caf0364 JB |
1627 | struct cfg80211_internal_bss tmp = {}, *res; |
1628 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 1629 | struct ieee80211_channel *channel; |
67af9811 | 1630 | bool signal_valid; |
2a519311 JB |
1631 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
1632 | u.probe_resp.variable); | |
6eb18137 | 1633 | int bss_type; |
bef9bacc | 1634 | |
0172bb75 JB |
1635 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
1636 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
1637 | ||
6e19bc4b | 1638 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
4ee3e063 | 1639 | |
bef9bacc MK |
1640 | if (WARN_ON(!mgmt)) |
1641 | return NULL; | |
1642 | ||
1643 | if (WARN_ON(!wiphy)) | |
1644 | return NULL; | |
2a519311 | 1645 | |
22fe88d3 | 1646 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1647 | (data->signal < 0 || data->signal > 100))) |
2a519311 JB |
1648 | return NULL; |
1649 | ||
bef9bacc | 1650 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
1651 | return NULL; |
1652 | ||
0172bb75 | 1653 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
119f94a6 | 1654 | ielen, data->chan, data->scan_width); |
0172bb75 JB |
1655 | if (!channel) |
1656 | return NULL; | |
1657 | ||
0e227084 | 1658 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 1659 | if (!ies) |
2a519311 | 1660 | return NULL; |
9caf0364 | 1661 | ies->len = ielen; |
8cef2c9d | 1662 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
0e227084 | 1663 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); |
9caf0364 | 1664 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
2a519311 | 1665 | |
9caf0364 JB |
1666 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
1667 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1668 | else | |
1669 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1670 | rcu_assign_pointer(tmp.pub.ies, ies); | |
505a2e88 | 1671 | |
9caf0364 JB |
1672 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); |
1673 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1674 | tmp.pub.scan_width = data->scan_width; |
1675 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1676 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
1677 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
6e19bc4b | 1678 | tmp.ts_boottime = data->boottime_ns; |
1d76250b | 1679 | tmp.parent_tsf = data->parent_tsf; |
983dafaa SD |
1680 | tmp.pub.chains = data->chains; |
1681 | memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS); | |
1d76250b | 1682 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); |
0cd01efb SS |
1683 | if (non_tx_data) { |
1684 | tmp.pub.transmitted_bss = non_tx_data->tx_bss; | |
1685 | tmp.pub.bssid_index = non_tx_data->bssid_index; | |
1686 | tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator; | |
1687 | } | |
9caf0364 | 1688 | |
6e19bc4b | 1689 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 | 1690 | wiphy->max_adj_channel_rssi_comp; |
0cd01efb | 1691 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); |
2a519311 JB |
1692 | if (!res) |
1693 | return NULL; | |
1694 | ||
57fbcce3 | 1695 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1696 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1697 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1698 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1699 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1700 | } else { | |
1701 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1702 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1703 | } | |
e38f8a7a | 1704 | |
4ee3e063 | 1705 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1706 | /* cfg80211_bss_update gives us a referenced result */ |
1707 | return &res->pub; | |
1708 | } | |
0b8fb823 PX |
1709 | |
1710 | struct cfg80211_bss * | |
1711 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, | |
1712 | struct cfg80211_inform_bss *data, | |
1713 | struct ieee80211_mgmt *mgmt, size_t len, | |
1714 | gfp_t gfp) | |
1715 | { | |
7011ba58 | 1716 | struct cfg80211_bss *res, *tmp_bss; |
0b8fb823 PX |
1717 | const u8 *ie = mgmt->u.probe_resp.variable; |
1718 | const struct cfg80211_bss_ies *ies1, *ies2; | |
1719 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
1720 | u.probe_resp.variable); | |
0cd01efb | 1721 | struct cfg80211_non_tx_bss non_tx_data; |
0b8fb823 PX |
1722 | |
1723 | res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt, | |
1724 | len, NULL, gfp); | |
213ed579 SS |
1725 | if (!res || !wiphy->support_mbssid || |
1726 | !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen)) | |
1727 | return res; | |
1728 | if (wiphy->support_only_he_mbssid && | |
1729 | !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen)) | |
0b8fb823 PX |
1730 | return res; |
1731 | ||
0cd01efb | 1732 | non_tx_data.tx_bss = res; |
0b8fb823 | 1733 | /* process each non-transmitting bss */ |
0cd01efb SS |
1734 | cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len, |
1735 | &non_tx_data, gfp); | |
0b8fb823 PX |
1736 | |
1737 | /* check if the res has other nontransmitting bss which is not | |
1738 | * in MBSSID IE | |
1739 | */ | |
1740 | ies1 = rcu_access_pointer(res->ies); | |
0b8fb823 PX |
1741 | |
1742 | /* go through nontrans_list, if the timestamp of the BSS is | |
1743 | * earlier than the timestamp of the transmitting BSS then | |
1744 | * update it | |
1745 | */ | |
7011ba58 | 1746 | list_for_each_entry(tmp_bss, &res->nontrans_list, |
0b8fb823 | 1747 | nontrans_list) { |
7011ba58 | 1748 | ies2 = rcu_access_pointer(tmp_bss->ies); |
0b8fb823 PX |
1749 | if (ies2->tsf < ies1->tsf) |
1750 | cfg80211_update_notlisted_nontrans(wiphy, tmp_bss, | |
1751 | mgmt, len, gfp); | |
1752 | } | |
1753 | ||
1754 | return res; | |
1755 | } | |
6e19bc4b | 1756 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 1757 | |
5b112d3d | 1758 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 1759 | { |
f26cbf40 | 1760 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
1761 | struct cfg80211_internal_bss *bss; |
1762 | ||
1763 | if (!pub) | |
1764 | return; | |
1765 | ||
1766 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1767 | |
1b8ec87a ZG |
1768 | spin_lock_bh(&rdev->bss_lock); |
1769 | bss_ref_get(rdev, bss); | |
1770 | spin_unlock_bh(&rdev->bss_lock); | |
4c0c0b75 JB |
1771 | } |
1772 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
1773 | ||
5b112d3d | 1774 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 1775 | { |
f26cbf40 | 1776 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
1777 | struct cfg80211_internal_bss *bss; |
1778 | ||
1779 | if (!pub) | |
1780 | return; | |
1781 | ||
1782 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1783 | |
1b8ec87a ZG |
1784 | spin_lock_bh(&rdev->bss_lock); |
1785 | bss_ref_put(rdev, bss); | |
1786 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 JB |
1787 | } |
1788 | EXPORT_SYMBOL(cfg80211_put_bss); | |
1789 | ||
d491af19 JB |
1790 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1791 | { | |
f26cbf40 | 1792 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
7011ba58 SS |
1793 | struct cfg80211_internal_bss *bss, *tmp1; |
1794 | struct cfg80211_bss *nontrans_bss, *tmp; | |
d491af19 JB |
1795 | |
1796 | if (WARN_ON(!pub)) | |
1797 | return; | |
1798 | ||
1799 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
1800 | ||
1b8ec87a | 1801 | spin_lock_bh(&rdev->bss_lock); |
7011ba58 SS |
1802 | if (list_empty(&bss->list)) |
1803 | goto out; | |
1804 | ||
1805 | list_for_each_entry_safe(nontrans_bss, tmp, | |
1806 | &pub->nontrans_list, | |
1807 | nontrans_list) { | |
1808 | tmp1 = container_of(nontrans_bss, | |
1809 | struct cfg80211_internal_bss, pub); | |
1810 | if (__cfg80211_unlink_bss(rdev, tmp1)) | |
1b8ec87a | 1811 | rdev->bss_generation++; |
3207390a | 1812 | } |
7011ba58 SS |
1813 | |
1814 | if (__cfg80211_unlink_bss(rdev, bss)) | |
1815 | rdev->bss_generation++; | |
1816 | out: | |
1b8ec87a | 1817 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
1818 | } |
1819 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
1820 | ||
3d23e349 | 1821 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
1822 | static struct cfg80211_registered_device * |
1823 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
1824 | { | |
5fe231e8 | 1825 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
1826 | struct net_device *dev; |
1827 | ||
5fe231e8 JB |
1828 | ASSERT_RTNL(); |
1829 | ||
9f419f38 JB |
1830 | dev = dev_get_by_index(net, ifindex); |
1831 | if (!dev) | |
5fe231e8 JB |
1832 | return ERR_PTR(-ENODEV); |
1833 | if (dev->ieee80211_ptr) | |
f26cbf40 | 1834 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 1835 | else |
9f419f38 JB |
1836 | rdev = ERR_PTR(-ENODEV); |
1837 | dev_put(dev); | |
9f419f38 JB |
1838 | return rdev; |
1839 | } | |
1840 | ||
2a519311 JB |
1841 | int cfg80211_wext_siwscan(struct net_device *dev, |
1842 | struct iw_request_info *info, | |
1843 | union iwreq_data *wrqu, char *extra) | |
1844 | { | |
1845 | struct cfg80211_registered_device *rdev; | |
1846 | struct wiphy *wiphy; | |
1847 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 1848 | struct cfg80211_scan_request *creq = NULL; |
2a519311 | 1849 | int i, err, n_channels = 0; |
57fbcce3 | 1850 | enum nl80211_band band; |
2a519311 JB |
1851 | |
1852 | if (!netif_running(dev)) | |
1853 | return -ENETDOWN; | |
1854 | ||
b2e3abdc HS |
1855 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
1856 | wreq = (struct iw_scan_req *)extra; | |
1857 | ||
463d0183 | 1858 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1859 | |
1860 | if (IS_ERR(rdev)) | |
1861 | return PTR_ERR(rdev); | |
1862 | ||
f9d15d16 | 1863 | if (rdev->scan_req || rdev->scan_msg) { |
2a519311 JB |
1864 | err = -EBUSY; |
1865 | goto out; | |
1866 | } | |
1867 | ||
1868 | wiphy = &rdev->wiphy; | |
1869 | ||
b2e3abdc HS |
1870 | /* Determine number of channels, needed to allocate creq */ |
1871 | if (wreq && wreq->num_channels) | |
1872 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
1873 | else |
1874 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
1875 | |
1876 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1877 | n_channels * sizeof(void *), | |
1878 | GFP_ATOMIC); | |
1879 | if (!creq) { | |
1880 | err = -ENOMEM; | |
1881 | goto out; | |
1882 | } | |
1883 | ||
1884 | creq->wiphy = wiphy; | |
fd014284 | 1885 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1886 | /* SSIDs come after channels */ |
1887 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1888 | creq->n_channels = n_channels; |
1889 | creq->n_ssids = 1; | |
15d6030b | 1890 | creq->scan_start = jiffies; |
2a519311 | 1891 | |
b2e3abdc | 1892 | /* translate "Scan on frequencies" request */ |
2a519311 | 1893 | i = 0; |
57fbcce3 | 1894 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
2a519311 | 1895 | int j; |
584991dc | 1896 | |
2a519311 JB |
1897 | if (!wiphy->bands[band]) |
1898 | continue; | |
584991dc | 1899 | |
2a519311 | 1900 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1901 | /* ignore disabled channels */ |
1902 | if (wiphy->bands[band]->channels[j].flags & | |
1903 | IEEE80211_CHAN_DISABLED) | |
1904 | continue; | |
b2e3abdc HS |
1905 | |
1906 | /* If we have a wireless request structure and the | |
1907 | * wireless request specifies frequencies, then search | |
1908 | * for the matching hardware channel. | |
1909 | */ | |
1910 | if (wreq && wreq->num_channels) { | |
1911 | int k; | |
1912 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1913 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
1914 | struct iw_freq *freq = |
1915 | &wreq->channel_list[k]; | |
1916 | int wext_freq = | |
1917 | cfg80211_wext_freq(freq); | |
1918 | ||
b2e3abdc HS |
1919 | if (wext_freq == wiphy_freq) |
1920 | goto wext_freq_found; | |
1921 | } | |
1922 | goto wext_freq_not_found; | |
1923 | } | |
1924 | ||
1925 | wext_freq_found: | |
2a519311 JB |
1926 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1927 | i++; | |
b2e3abdc | 1928 | wext_freq_not_found: ; |
2a519311 JB |
1929 | } |
1930 | } | |
8862dc5f HS |
1931 | /* No channels found? */ |
1932 | if (!i) { | |
1933 | err = -EINVAL; | |
1934 | goto out; | |
1935 | } | |
2a519311 | 1936 | |
b2e3abdc HS |
1937 | /* Set real number of channels specified in creq->channels[] */ |
1938 | creq->n_channels = i; | |
2a519311 | 1939 | |
b2e3abdc HS |
1940 | /* translate "Scan for SSID" request */ |
1941 | if (wreq) { | |
2a519311 | 1942 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1943 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1944 | err = -EINVAL; | |
1945 | goto out; | |
1946 | } | |
2a519311 JB |
1947 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1948 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1949 | } | |
1950 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1951 | creq->n_ssids = 0; | |
1952 | } | |
1953 | ||
57fbcce3 | 1954 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
a401d2bb JB |
1955 | if (wiphy->bands[i]) |
1956 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1957 | |
818965d3 JM |
1958 | eth_broadcast_addr(creq->bssid); |
1959 | ||
2a519311 | 1960 | rdev->scan_req = creq; |
e35e4d28 | 1961 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1962 | if (err) { |
1963 | rdev->scan_req = NULL; | |
65486c8b | 1964 | /* creq will be freed below */ |
463d0183 | 1965 | } else { |
fd014284 | 1966 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1967 | /* creq now owned by driver */ |
1968 | creq = NULL; | |
463d0183 JB |
1969 | dev_hold(dev); |
1970 | } | |
2a519311 | 1971 | out: |
65486c8b | 1972 | kfree(creq); |
2a519311 JB |
1973 | return err; |
1974 | } | |
2afe38d1 | 1975 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 1976 | |
76a70e9c JM |
1977 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
1978 | const struct cfg80211_bss_ies *ies, | |
1979 | char *current_ev, char *end_buf) | |
2a519311 | 1980 | { |
9caf0364 | 1981 | const u8 *pos, *end, *next; |
2a519311 JB |
1982 | struct iw_event iwe; |
1983 | ||
9caf0364 | 1984 | if (!ies) |
76a70e9c | 1985 | return current_ev; |
2a519311 JB |
1986 | |
1987 | /* | |
1988 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1989 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1990 | */ | |
9caf0364 JB |
1991 | pos = ies->data; |
1992 | end = pos + ies->len; | |
2a519311 JB |
1993 | |
1994 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1995 | next = pos + 2 + pos[1]; | |
1996 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1997 | next = next + 2 + next[1]; | |
1998 | ||
1999 | memset(&iwe, 0, sizeof(iwe)); | |
2000 | iwe.cmd = IWEVGENIE; | |
2001 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
2002 | current_ev = iwe_stream_add_point_check(info, current_ev, |
2003 | end_buf, &iwe, | |
2004 | (void *)pos); | |
2005 | if (IS_ERR(current_ev)) | |
2006 | return current_ev; | |
2a519311 JB |
2007 | pos = next; |
2008 | } | |
2009 | ||
2010 | if (end > pos) { | |
2011 | memset(&iwe, 0, sizeof(iwe)); | |
2012 | iwe.cmd = IWEVGENIE; | |
2013 | iwe.u.data.length = end - pos; | |
76a70e9c JM |
2014 | current_ev = iwe_stream_add_point_check(info, current_ev, |
2015 | end_buf, &iwe, | |
2016 | (void *)pos); | |
2017 | if (IS_ERR(current_ev)) | |
2018 | return current_ev; | |
2a519311 | 2019 | } |
76a70e9c JM |
2020 | |
2021 | return current_ev; | |
2a519311 JB |
2022 | } |
2023 | ||
2a519311 | 2024 | static char * |
77965c97 JB |
2025 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
2026 | struct cfg80211_internal_bss *bss, char *current_ev, | |
2027 | char *end_buf) | |
2a519311 | 2028 | { |
9caf0364 | 2029 | const struct cfg80211_bss_ies *ies; |
2a519311 | 2030 | struct iw_event iwe; |
9caf0364 | 2031 | const u8 *ie; |
76a70e9c JM |
2032 | u8 buf[50]; |
2033 | u8 *cfg, *p, *tmp; | |
9caf0364 | 2034 | int rem, i, sig; |
2a519311 JB |
2035 | bool ismesh = false; |
2036 | ||
2037 | memset(&iwe, 0, sizeof(iwe)); | |
2038 | iwe.cmd = SIOCGIWAP; | |
2039 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
2040 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
2041 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2042 | IW_EV_ADDR_LEN); | |
2043 | if (IS_ERR(current_ev)) | |
2044 | return current_ev; | |
2a519311 JB |
2045 | |
2046 | memset(&iwe, 0, sizeof(iwe)); | |
2047 | iwe.cmd = SIOCGIWFREQ; | |
2048 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
2049 | iwe.u.freq.e = 0; | |
76a70e9c JM |
2050 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2051 | IW_EV_FREQ_LEN); | |
2052 | if (IS_ERR(current_ev)) | |
2053 | return current_ev; | |
2a519311 JB |
2054 | |
2055 | memset(&iwe, 0, sizeof(iwe)); | |
2056 | iwe.cmd = SIOCGIWFREQ; | |
2057 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
2058 | iwe.u.freq.e = 6; | |
76a70e9c JM |
2059 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2060 | IW_EV_FREQ_LEN); | |
2061 | if (IS_ERR(current_ev)) | |
2062 | return current_ev; | |
2a519311 | 2063 | |
77965c97 | 2064 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
2065 | memset(&iwe, 0, sizeof(iwe)); |
2066 | iwe.cmd = IWEVQUAL; | |
2067 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
2068 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 2069 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 2070 | switch (wiphy->signal_type) { |
2a519311 | 2071 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
2072 | sig = bss->pub.signal / 100; |
2073 | iwe.u.qual.level = sig; | |
2a519311 | 2074 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
2075 | if (sig < -110) /* rather bad */ |
2076 | sig = -110; | |
2077 | else if (sig > -40) /* perfect */ | |
2078 | sig = -40; | |
2079 | /* will give a range of 0 .. 70 */ | |
2080 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
2081 | break; |
2082 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
2083 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
2084 | /* will give range 0 .. 100 */ |
2085 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
2086 | break; |
2087 | default: | |
2088 | /* not reached */ | |
2089 | break; | |
2090 | } | |
76a70e9c JM |
2091 | current_ev = iwe_stream_add_event_check(info, current_ev, |
2092 | end_buf, &iwe, | |
2093 | IW_EV_QUAL_LEN); | |
2094 | if (IS_ERR(current_ev)) | |
2095 | return current_ev; | |
2a519311 JB |
2096 | } |
2097 | ||
2098 | memset(&iwe, 0, sizeof(iwe)); | |
2099 | iwe.cmd = SIOCGIWENCODE; | |
2100 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
2101 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
2102 | else | |
2103 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
2104 | iwe.u.data.length = 0; | |
76a70e9c JM |
2105 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
2106 | &iwe, ""); | |
2107 | if (IS_ERR(current_ev)) | |
2108 | return current_ev; | |
2a519311 | 2109 | |
9caf0364 JB |
2110 | rcu_read_lock(); |
2111 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
2112 | rem = ies->len; |
2113 | ie = ies->data; | |
9caf0364 | 2114 | |
83c7aa1a | 2115 | while (rem >= 2) { |
2a519311 JB |
2116 | /* invalid data */ |
2117 | if (ie[1] > rem - 2) | |
2118 | break; | |
2119 | ||
2120 | switch (ie[0]) { | |
2121 | case WLAN_EID_SSID: | |
2122 | memset(&iwe, 0, sizeof(iwe)); | |
2123 | iwe.cmd = SIOCGIWESSID; | |
2124 | iwe.u.data.length = ie[1]; | |
2125 | iwe.u.data.flags = 1; | |
76a70e9c JM |
2126 | current_ev = iwe_stream_add_point_check(info, |
2127 | current_ev, | |
2128 | end_buf, &iwe, | |
2129 | (u8 *)ie + 2); | |
2130 | if (IS_ERR(current_ev)) | |
2131 | goto unlock; | |
2a519311 JB |
2132 | break; |
2133 | case WLAN_EID_MESH_ID: | |
2134 | memset(&iwe, 0, sizeof(iwe)); | |
2135 | iwe.cmd = SIOCGIWESSID; | |
2136 | iwe.u.data.length = ie[1]; | |
2137 | iwe.u.data.flags = 1; | |
76a70e9c JM |
2138 | current_ev = iwe_stream_add_point_check(info, |
2139 | current_ev, | |
2140 | end_buf, &iwe, | |
2141 | (u8 *)ie + 2); | |
2142 | if (IS_ERR(current_ev)) | |
2143 | goto unlock; | |
2a519311 JB |
2144 | break; |
2145 | case WLAN_EID_MESH_CONFIG: | |
2146 | ismesh = true; | |
136cfa28 | 2147 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 2148 | break; |
9caf0364 | 2149 | cfg = (u8 *)ie + 2; |
2a519311 JB |
2150 | memset(&iwe, 0, sizeof(iwe)); |
2151 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
2152 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
2153 | "0x%02X", cfg[0]); | |
2a519311 | 2154 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2155 | current_ev = iwe_stream_add_point_check(info, |
2156 | current_ev, | |
2157 | end_buf, | |
2158 | &iwe, buf); | |
2159 | if (IS_ERR(current_ev)) | |
2160 | goto unlock; | |
76aa5e70 RP |
2161 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
2162 | cfg[1]); | |
2a519311 | 2163 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2164 | current_ev = iwe_stream_add_point_check(info, |
2165 | current_ev, | |
2166 | end_buf, | |
2167 | &iwe, buf); | |
2168 | if (IS_ERR(current_ev)) | |
2169 | goto unlock; | |
76aa5e70 RP |
2170 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
2171 | cfg[2]); | |
2a519311 | 2172 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2173 | current_ev = iwe_stream_add_point_check(info, |
2174 | current_ev, | |
2175 | end_buf, | |
2176 | &iwe, buf); | |
2177 | if (IS_ERR(current_ev)) | |
2178 | goto unlock; | |
76aa5e70 | 2179 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 | 2180 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2181 | current_ev = iwe_stream_add_point_check(info, |
2182 | current_ev, | |
2183 | end_buf, | |
2184 | &iwe, buf); | |
2185 | if (IS_ERR(current_ev)) | |
2186 | goto unlock; | |
76aa5e70 RP |
2187 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
2188 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
2189 | current_ev = iwe_stream_add_point_check(info, |
2190 | current_ev, | |
2191 | end_buf, | |
2192 | &iwe, buf); | |
2193 | if (IS_ERR(current_ev)) | |
2194 | goto unlock; | |
76aa5e70 RP |
2195 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
2196 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
2197 | current_ev = iwe_stream_add_point_check(info, |
2198 | current_ev, | |
2199 | end_buf, | |
2200 | &iwe, buf); | |
2201 | if (IS_ERR(current_ev)) | |
2202 | goto unlock; | |
76aa5e70 | 2203 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
2a519311 | 2204 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2205 | current_ev = iwe_stream_add_point_check(info, |
2206 | current_ev, | |
2207 | end_buf, | |
2208 | &iwe, buf); | |
2209 | if (IS_ERR(current_ev)) | |
2210 | goto unlock; | |
2a519311 JB |
2211 | break; |
2212 | case WLAN_EID_SUPP_RATES: | |
2213 | case WLAN_EID_EXT_SUPP_RATES: | |
2214 | /* display all supported rates in readable format */ | |
2215 | p = current_ev + iwe_stream_lcp_len(info); | |
2216 | ||
2217 | memset(&iwe, 0, sizeof(iwe)); | |
2218 | iwe.cmd = SIOCGIWRATE; | |
2219 | /* Those two flags are ignored... */ | |
2220 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
2221 | ||
2222 | for (i = 0; i < ie[1]; i++) { | |
2223 | iwe.u.bitrate.value = | |
2224 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 2225 | tmp = p; |
2a519311 | 2226 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
2227 | end_buf, &iwe, |
2228 | IW_EV_PARAM_LEN); | |
2229 | if (p == tmp) { | |
2230 | current_ev = ERR_PTR(-E2BIG); | |
2231 | goto unlock; | |
2232 | } | |
2a519311 JB |
2233 | } |
2234 | current_ev = p; | |
2235 | break; | |
2236 | } | |
2237 | rem -= ie[1] + 2; | |
2238 | ie += ie[1] + 2; | |
2239 | } | |
2240 | ||
f64f9e71 JP |
2241 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
2242 | ismesh) { | |
2a519311 JB |
2243 | memset(&iwe, 0, sizeof(iwe)); |
2244 | iwe.cmd = SIOCGIWMODE; | |
2245 | if (ismesh) | |
2246 | iwe.u.mode = IW_MODE_MESH; | |
2247 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
2248 | iwe.u.mode = IW_MODE_MASTER; | |
2249 | else | |
2250 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
2251 | current_ev = iwe_stream_add_event_check(info, current_ev, |
2252 | end_buf, &iwe, | |
2253 | IW_EV_UINT_LEN); | |
2254 | if (IS_ERR(current_ev)) | |
2255 | goto unlock; | |
2a519311 JB |
2256 | } |
2257 | ||
76a70e9c JM |
2258 | memset(&iwe, 0, sizeof(iwe)); |
2259 | iwe.cmd = IWEVCUSTOM; | |
2260 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); | |
2261 | iwe.u.data.length = strlen(buf); | |
2262 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, | |
2263 | &iwe, buf); | |
2264 | if (IS_ERR(current_ev)) | |
2265 | goto unlock; | |
2266 | memset(&iwe, 0, sizeof(iwe)); | |
2267 | iwe.cmd = IWEVCUSTOM; | |
2268 | sprintf(buf, " Last beacon: %ums ago", | |
2269 | elapsed_jiffies_msecs(bss->ts)); | |
2270 | iwe.u.data.length = strlen(buf); | |
2271 | current_ev = iwe_stream_add_point_check(info, current_ev, | |
2272 | end_buf, &iwe, buf); | |
2273 | if (IS_ERR(current_ev)) | |
2274 | goto unlock; | |
2275 | ||
2276 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
2277 | ||
2278 | unlock: | |
9caf0364 | 2279 | rcu_read_unlock(); |
2a519311 JB |
2280 | return current_ev; |
2281 | } | |
2282 | ||
2283 | ||
1b8ec87a | 2284 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
2285 | struct iw_request_info *info, |
2286 | char *buf, size_t len) | |
2287 | { | |
2288 | char *current_ev = buf; | |
2289 | char *end_buf = buf + len; | |
2290 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 2291 | int err = 0; |
2a519311 | 2292 | |
1b8ec87a ZG |
2293 | spin_lock_bh(&rdev->bss_lock); |
2294 | cfg80211_bss_expire(rdev); | |
2a519311 | 2295 | |
1b8ec87a | 2296 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 2297 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
2298 | err = -E2BIG; |
2299 | break; | |
2a519311 | 2300 | } |
1b8ec87a | 2301 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 2302 | current_ev, end_buf); |
76a70e9c JM |
2303 | if (IS_ERR(current_ev)) { |
2304 | err = PTR_ERR(current_ev); | |
2305 | break; | |
2306 | } | |
2a519311 | 2307 | } |
1b8ec87a | 2308 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
2309 | |
2310 | if (err) | |
2311 | return err; | |
2a519311 JB |
2312 | return current_ev - buf; |
2313 | } | |
2314 | ||
2315 | ||
2316 | int cfg80211_wext_giwscan(struct net_device *dev, | |
2317 | struct iw_request_info *info, | |
2318 | struct iw_point *data, char *extra) | |
2319 | { | |
2320 | struct cfg80211_registered_device *rdev; | |
2321 | int res; | |
2322 | ||
2323 | if (!netif_running(dev)) | |
2324 | return -ENETDOWN; | |
2325 | ||
463d0183 | 2326 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
2327 | |
2328 | if (IS_ERR(rdev)) | |
2329 | return PTR_ERR(rdev); | |
2330 | ||
f9d15d16 | 2331 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 2332 | return -EAGAIN; |
2a519311 JB |
2333 | |
2334 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
2335 | data->length = 0; | |
2336 | if (res >= 0) { | |
2337 | data->length = res; | |
2338 | res = 0; | |
2339 | } | |
2340 | ||
2a519311 JB |
2341 | return res; |
2342 | } | |
2afe38d1 | 2343 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 2344 | #endif |