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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 | } | |
0532d4f1 JB |
113 | } |
114 | ||
1b8ec87a | 115 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
776b3580 | 116 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 117 | { |
1b8ec87a | 118 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
119 | |
120 | if (bss->pub.hidden_beacon_bss) { | |
121 | struct cfg80211_internal_bss *hbss; | |
122 | hbss = container_of(bss->pub.hidden_beacon_bss, | |
123 | struct cfg80211_internal_bss, | |
124 | pub); | |
125 | hbss->refcount--; | |
126 | if (hbss->refcount == 0) | |
127 | bss_free(hbss); | |
128 | } | |
129 | bss->refcount--; | |
130 | if (bss->refcount == 0) | |
131 | bss_free(bss); | |
0532d4f1 JB |
132 | } |
133 | ||
1b8ec87a | 134 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
135 | struct cfg80211_internal_bss *bss) |
136 | { | |
1b8ec87a | 137 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 138 | |
776b3580 JB |
139 | if (!list_empty(&bss->hidden_list)) { |
140 | /* | |
141 | * don't remove the beacon entry if it has | |
142 | * probe responses associated with it | |
143 | */ | |
144 | if (!bss->pub.hidden_beacon_bss) | |
145 | return false; | |
146 | /* | |
147 | * if it's a probe response entry break its | |
148 | * link to the other entries in the group | |
149 | */ | |
150 | list_del_init(&bss->hidden_list); | |
151 | } | |
152 | ||
e8e27c66 | 153 | list_del_init(&bss->list); |
0b8fb823 | 154 | list_del_init(&bss->nontrans_list); |
1b8ec87a | 155 | rb_erase(&bss->rbn, &rdev->bss_tree); |
9853a55e JB |
156 | rdev->bss_entries--; |
157 | WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list), | |
158 | "rdev bss entries[%d]/list[empty:%d] corruption\n", | |
159 | rdev->bss_entries, list_empty(&rdev->bss_list)); | |
1b8ec87a | 160 | bss_ref_put(rdev, bss); |
776b3580 | 161 | return true; |
e8e27c66 AK |
162 | } |
163 | ||
0b8fb823 PX |
164 | static void cfg80211_gen_new_bssid(const u8 *bssid, u8 max_bssid, |
165 | u8 mbssid_index, u8 *new_bssid_addr) | |
166 | { | |
167 | u64 bssid_tmp, new_bssid = 0; | |
168 | u64 lsb_n; | |
169 | ||
170 | bssid_tmp = ether_addr_to_u64(bssid); | |
171 | ||
172 | lsb_n = bssid_tmp & ((1 << max_bssid) - 1); | |
173 | new_bssid = bssid_tmp; | |
174 | new_bssid &= ~((1 << max_bssid) - 1); | |
175 | new_bssid |= (lsb_n + mbssid_index) % (1 << max_bssid); | |
176 | ||
177 | u64_to_ether_addr(new_bssid, new_bssid_addr); | |
178 | } | |
179 | ||
180 | static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen, | |
181 | const u8 *subelement, size_t subie_len, | |
182 | u8 *new_ie, gfp_t gfp) | |
183 | { | |
184 | u8 *pos, *tmp; | |
185 | const u8 *tmp_old, *tmp_new; | |
186 | u8 *sub_copy; | |
187 | ||
188 | /* copy subelement as we need to change its content to | |
189 | * mark an ie after it is processed. | |
190 | */ | |
191 | sub_copy = kmalloc(subie_len, gfp); | |
192 | if (!sub_copy) | |
193 | return 0; | |
194 | memcpy(sub_copy, subelement, subie_len); | |
195 | ||
196 | pos = &new_ie[0]; | |
197 | ||
198 | /* set new ssid */ | |
199 | tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len); | |
200 | if (tmp_new) { | |
201 | memcpy(pos, tmp_new, tmp_new[1] + 2); | |
202 | pos += (tmp_new[1] + 2); | |
203 | } | |
204 | ||
205 | /* go through IEs in ie (skip SSID) and subelement, | |
206 | * merge them into new_ie | |
207 | */ | |
208 | tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen); | |
209 | tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie; | |
210 | ||
211 | while (tmp_old + tmp_old[1] + 2 - ie <= ielen) { | |
212 | if (tmp_old[0] == 0) { | |
213 | tmp_old++; | |
214 | continue; | |
215 | } | |
216 | ||
217 | tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy, subie_len); | |
218 | if (!tmp) { | |
219 | /* ie in old ie but not in subelement */ | |
220 | if (tmp_old[0] != WLAN_EID_MULTIPLE_BSSID) { | |
221 | memcpy(pos, tmp_old, tmp_old[1] + 2); | |
222 | pos += tmp_old[1] + 2; | |
223 | } | |
224 | } else { | |
225 | /* ie in transmitting ie also in subelement, | |
226 | * copy from subelement and flag the ie in subelement | |
227 | * as copied (by setting eid field to 0xff). For | |
228 | * vendor ie, compare OUI + type + subType to | |
229 | * determine if they are the same ie. | |
230 | */ | |
231 | if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) { | |
232 | if (!memcmp(tmp_old + 2, tmp + 2, 5)) { | |
233 | /* same vendor ie, copy from | |
234 | * subelement | |
235 | */ | |
236 | memcpy(pos, tmp, tmp[1] + 2); | |
237 | pos += tmp[1] + 2; | |
238 | tmp[0] = 0xff; | |
239 | } else { | |
240 | memcpy(pos, tmp_old, tmp_old[1] + 2); | |
241 | pos += tmp_old[1] + 2; | |
242 | } | |
243 | } else { | |
244 | /* copy ie from subelement into new ie */ | |
245 | memcpy(pos, tmp, tmp[1] + 2); | |
246 | pos += tmp[1] + 2; | |
247 | tmp[0] = 0xff; | |
248 | } | |
249 | } | |
250 | ||
251 | if (tmp_old + tmp_old[1] + 2 - ie == ielen) | |
252 | break; | |
253 | ||
254 | tmp_old += tmp_old[1] + 2; | |
255 | } | |
256 | ||
257 | /* go through subelement again to check if there is any ie not | |
258 | * copied to new ie, skip ssid, capability, bssid-index ie | |
259 | */ | |
260 | tmp_new = sub_copy; | |
261 | while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) { | |
262 | if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP || | |
263 | tmp_new[0] == WLAN_EID_SSID || | |
264 | tmp_new[0] == WLAN_EID_MULTI_BSSID_IDX || | |
265 | tmp_new[0] == 0xff)) { | |
266 | memcpy(pos, tmp_new, tmp_new[1] + 2); | |
267 | pos += tmp_new[1] + 2; | |
268 | } | |
269 | if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len) | |
270 | break; | |
271 | tmp_new += tmp_new[1] + 2; | |
272 | } | |
273 | ||
274 | kfree(sub_copy); | |
275 | return pos - new_ie; | |
276 | } | |
277 | ||
278 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, | |
279 | const u8 *ssid, size_t ssid_len) | |
280 | { | |
281 | const struct cfg80211_bss_ies *ies; | |
282 | const u8 *ssidie; | |
283 | ||
284 | if (bssid && !ether_addr_equal(a->bssid, bssid)) | |
285 | return false; | |
286 | ||
287 | if (!ssid) | |
288 | return true; | |
289 | ||
290 | ies = rcu_access_pointer(a->ies); | |
291 | if (!ies) | |
292 | return false; | |
293 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
294 | if (!ssidie) | |
295 | return false; | |
296 | if (ssidie[1] != ssid_len) | |
297 | return false; | |
298 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
299 | } | |
300 | ||
301 | static int | |
302 | cfg80211_add_nontrans_list(struct cfg80211_internal_bss *trans_bss, | |
303 | struct cfg80211_internal_bss *nontrans_bss) | |
304 | { | |
305 | const u8 *ssid; | |
306 | size_t ssid_len; | |
307 | struct cfg80211_internal_bss *bss = NULL; | |
308 | ||
309 | rcu_read_lock(); | |
310 | ssid = ieee80211_bss_get_ie(&nontrans_bss->pub, WLAN_EID_SSID); | |
311 | if (!ssid) { | |
312 | rcu_read_unlock(); | |
313 | return -EINVAL; | |
314 | } | |
315 | ssid_len = ssid[1]; | |
316 | ssid = ssid + 2; | |
317 | rcu_read_unlock(); | |
318 | ||
319 | /* check if nontrans_bss is in the list */ | |
320 | list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) { | |
321 | if (is_bss(&bss->pub, nontrans_bss->pub.bssid, ssid, ssid_len)) | |
322 | return 0; | |
323 | } | |
324 | ||
325 | /* add to the list */ | |
326 | list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list); | |
327 | return 0; | |
328 | } | |
329 | ||
1b8ec87a | 330 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
331 | unsigned long expire_time) |
332 | { | |
333 | struct cfg80211_internal_bss *bss, *tmp; | |
334 | bool expired = false; | |
335 | ||
1b8ec87a | 336 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 337 | |
1b8ec87a | 338 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
339 | if (atomic_read(&bss->hold)) |
340 | continue; | |
341 | if (!time_after(expire_time, bss->ts)) | |
342 | continue; | |
343 | ||
1b8ec87a | 344 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 345 | expired = true; |
15d6030b SL |
346 | } |
347 | ||
348 | if (expired) | |
1b8ec87a | 349 | rdev->bss_generation++; |
15d6030b SL |
350 | } |
351 | ||
9853a55e JB |
352 | static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) |
353 | { | |
354 | struct cfg80211_internal_bss *bss, *oldest = NULL; | |
355 | bool ret; | |
356 | ||
357 | lockdep_assert_held(&rdev->bss_lock); | |
358 | ||
359 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
360 | if (atomic_read(&bss->hold)) | |
361 | continue; | |
362 | ||
363 | if (!list_empty(&bss->hidden_list) && | |
364 | !bss->pub.hidden_beacon_bss) | |
365 | continue; | |
366 | ||
367 | if (oldest && time_before(oldest->ts, bss->ts)) | |
368 | continue; | |
369 | oldest = bss; | |
370 | } | |
371 | ||
372 | if (WARN_ON(!oldest)) | |
373 | return false; | |
374 | ||
375 | /* | |
376 | * The callers make sure to increase rdev->bss_generation if anything | |
377 | * gets removed (and a new entry added), so there's no need to also do | |
378 | * it here. | |
379 | */ | |
380 | ||
381 | ret = __cfg80211_unlink_bss(rdev, oldest); | |
382 | WARN_ON(!ret); | |
383 | return ret; | |
384 | } | |
385 | ||
f9d15d16 JB |
386 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
387 | bool send_message) | |
2a519311 | 388 | { |
667503dd | 389 | struct cfg80211_scan_request *request; |
fd014284 | 390 | struct wireless_dev *wdev; |
f9d15d16 | 391 | struct sk_buff *msg; |
3d23e349 | 392 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
393 | union iwreq_data wrqu; |
394 | #endif | |
395 | ||
5fe231e8 | 396 | ASSERT_RTNL(); |
01a0ac41 | 397 | |
f9d15d16 | 398 | if (rdev->scan_msg) { |
505a2e88 | 399 | nl80211_send_scan_msg(rdev, rdev->scan_msg); |
f9d15d16 JB |
400 | rdev->scan_msg = NULL; |
401 | return; | |
402 | } | |
667503dd | 403 | |
f9d15d16 | 404 | request = rdev->scan_req; |
01a0ac41 JB |
405 | if (!request) |
406 | return; | |
407 | ||
fd014284 | 408 | wdev = request->wdev; |
2a519311 | 409 | |
6829c878 JB |
410 | /* |
411 | * This must be before sending the other events! | |
412 | * Otherwise, wpa_supplicant gets completely confused with | |
413 | * wext events. | |
414 | */ | |
fd014284 JB |
415 | if (wdev->netdev) |
416 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 417 | |
1d76250b | 418 | if (!request->info.aborted && |
f9d15d16 JB |
419 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
420 | /* flush entries from previous scans */ | |
421 | spin_lock_bh(&rdev->bss_lock); | |
422 | __cfg80211_bss_expire(rdev, request->scan_start); | |
423 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 424 | } |
2a519311 | 425 | |
1d76250b | 426 | msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); |
f9d15d16 | 427 | |
3d23e349 | 428 | #ifdef CONFIG_CFG80211_WEXT |
1d76250b | 429 | if (wdev->netdev && !request->info.aborted) { |
2a519311 JB |
430 | memset(&wrqu, 0, sizeof(wrqu)); |
431 | ||
fd014284 | 432 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
433 | } |
434 | #endif | |
435 | ||
fd014284 JB |
436 | if (wdev->netdev) |
437 | dev_put(wdev->netdev); | |
2a519311 | 438 | |
36e6fea8 | 439 | rdev->scan_req = NULL; |
4a58e7c3 | 440 | kfree(request); |
f9d15d16 JB |
441 | |
442 | if (!send_message) | |
443 | rdev->scan_msg = msg; | |
444 | else | |
505a2e88 | 445 | nl80211_send_scan_msg(rdev, msg); |
2a519311 | 446 | } |
667503dd | 447 | |
36e6fea8 JB |
448 | void __cfg80211_scan_done(struct work_struct *wk) |
449 | { | |
450 | struct cfg80211_registered_device *rdev; | |
451 | ||
452 | rdev = container_of(wk, struct cfg80211_registered_device, | |
453 | scan_done_wk); | |
454 | ||
5fe231e8 | 455 | rtnl_lock(); |
f9d15d16 | 456 | ___cfg80211_scan_done(rdev, true); |
5fe231e8 | 457 | rtnl_unlock(); |
36e6fea8 JB |
458 | } |
459 | ||
1d76250b AS |
460 | void cfg80211_scan_done(struct cfg80211_scan_request *request, |
461 | struct cfg80211_scan_info *info) | |
667503dd | 462 | { |
1d76250b | 463 | trace_cfg80211_scan_done(request, info); |
f26cbf40 | 464 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req); |
667503dd | 465 | |
1d76250b | 466 | request->info = *info; |
5fe231e8 | 467 | request->notified = true; |
f26cbf40 | 468 | queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); |
667503dd | 469 | } |
2a519311 JB |
470 | EXPORT_SYMBOL(cfg80211_scan_done); |
471 | ||
ca986ad9 AVS |
472 | void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev, |
473 | struct cfg80211_sched_scan_request *req) | |
474 | { | |
475 | ASSERT_RTNL(); | |
476 | ||
477 | list_add_rcu(&req->list, &rdev->sched_scan_req_list); | |
478 | } | |
479 | ||
480 | static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev, | |
481 | struct cfg80211_sched_scan_request *req) | |
482 | { | |
483 | ASSERT_RTNL(); | |
484 | ||
485 | list_del_rcu(&req->list); | |
486 | kfree_rcu(req, rcu_head); | |
487 | } | |
488 | ||
489 | static struct cfg80211_sched_scan_request * | |
490 | cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid) | |
491 | { | |
492 | struct cfg80211_sched_scan_request *pos; | |
493 | ||
1b57b621 | 494 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); |
ca986ad9 | 495 | |
1b57b621 | 496 | list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list) { |
ca986ad9 AVS |
497 | if (pos->reqid == reqid) |
498 | return pos; | |
499 | } | |
b34939b9 | 500 | return NULL; |
ca986ad9 AVS |
501 | } |
502 | ||
503 | /* | |
504 | * Determines if a scheduled scan request can be handled. When a legacy | |
505 | * scheduled scan is running no other scheduled scan is allowed regardless | |
506 | * whether the request is for legacy or multi-support scan. When a multi-support | |
507 | * scheduled scan is running a request for legacy scan is not allowed. In this | |
508 | * case a request for multi-support scan can be handled if resources are | |
509 | * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached. | |
510 | */ | |
511 | int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev, | |
512 | bool want_multi) | |
513 | { | |
514 | struct cfg80211_sched_scan_request *pos; | |
515 | int i = 0; | |
516 | ||
517 | list_for_each_entry(pos, &rdev->sched_scan_req_list, list) { | |
518 | /* request id zero means legacy in progress */ | |
519 | if (!i && !pos->reqid) | |
520 | return -EINPROGRESS; | |
521 | i++; | |
522 | } | |
523 | ||
524 | if (i) { | |
525 | /* no legacy allowed when multi request(s) are active */ | |
526 | if (!want_multi) | |
527 | return -EINPROGRESS; | |
528 | ||
529 | /* resource limit reached */ | |
530 | if (i == rdev->wiphy.max_sched_scan_reqs) | |
531 | return -ENOSPC; | |
532 | } | |
533 | return 0; | |
534 | } | |
535 | ||
b34939b9 | 536 | void cfg80211_sched_scan_results_wk(struct work_struct *work) |
807f8a8c LC |
537 | { |
538 | struct cfg80211_registered_device *rdev; | |
b34939b9 | 539 | struct cfg80211_sched_scan_request *req, *tmp; |
807f8a8c | 540 | |
b34939b9 AVS |
541 | rdev = container_of(work, struct cfg80211_registered_device, |
542 | sched_scan_res_wk); | |
807f8a8c | 543 | |
5fe231e8 | 544 | rtnl_lock(); |
b34939b9 AVS |
545 | list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { |
546 | if (req->report_results) { | |
547 | req->report_results = false; | |
548 | if (req->flags & NL80211_SCAN_FLAG_FLUSH) { | |
549 | /* flush entries from previous scans */ | |
550 | spin_lock_bh(&rdev->bss_lock); | |
551 | __cfg80211_bss_expire(rdev, req->scan_start); | |
552 | spin_unlock_bh(&rdev->bss_lock); | |
553 | req->scan_start = jiffies; | |
554 | } | |
555 | nl80211_send_sched_scan(req, | |
556 | NL80211_CMD_SCHED_SCAN_RESULTS); | |
15d6030b | 557 | } |
15d6030b | 558 | } |
5fe231e8 | 559 | rtnl_unlock(); |
807f8a8c LC |
560 | } |
561 | ||
b34939b9 | 562 | void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 563 | { |
ca986ad9 AVS |
564 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
565 | struct cfg80211_sched_scan_request *request; | |
566 | ||
b34939b9 | 567 | trace_cfg80211_sched_scan_results(wiphy, reqid); |
807f8a8c | 568 | /* ignore if we're not scanning */ |
31a60ed1 | 569 | |
1b57b621 | 570 | rcu_read_lock(); |
b34939b9 AVS |
571 | request = cfg80211_find_sched_scan_req(rdev, reqid); |
572 | if (request) { | |
573 | request->report_results = true; | |
574 | queue_work(cfg80211_wq, &rdev->sched_scan_res_wk); | |
575 | } | |
1b57b621 | 576 | rcu_read_unlock(); |
807f8a8c LC |
577 | } |
578 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
579 | ||
b34939b9 | 580 | void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 581 | { |
f26cbf40 | 582 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 583 | |
792e6aa7 EP |
584 | ASSERT_RTNL(); |
585 | ||
b34939b9 | 586 | trace_cfg80211_sched_scan_stopped(wiphy, reqid); |
4ee3e063 | 587 | |
b34939b9 | 588 | __cfg80211_stop_sched_scan(rdev, reqid, true); |
792e6aa7 EP |
589 | } |
590 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl); | |
591 | ||
b34939b9 | 592 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid) |
792e6aa7 EP |
593 | { |
594 | rtnl_lock(); | |
b34939b9 | 595 | cfg80211_sched_scan_stopped_rtnl(wiphy, reqid); |
5fe231e8 | 596 | rtnl_unlock(); |
807f8a8c | 597 | } |
807f8a8c LC |
598 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
599 | ||
ca986ad9 AVS |
600 | int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev, |
601 | struct cfg80211_sched_scan_request *req, | |
602 | bool driver_initiated) | |
807f8a8c | 603 | { |
5fe231e8 | 604 | ASSERT_RTNL(); |
807f8a8c | 605 | |
85a9994a | 606 | if (!driver_initiated) { |
3a3ecf1d | 607 | int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid); |
85a9994a LC |
608 | if (err) |
609 | return err; | |
610 | } | |
807f8a8c | 611 | |
ca986ad9 | 612 | nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED); |
807f8a8c | 613 | |
ca986ad9 | 614 | cfg80211_del_sched_scan_req(rdev, req); |
807f8a8c | 615 | |
3b4670ff | 616 | return 0; |
807f8a8c LC |
617 | } |
618 | ||
ca986ad9 AVS |
619 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
620 | u64 reqid, bool driver_initiated) | |
621 | { | |
622 | struct cfg80211_sched_scan_request *sched_scan_req; | |
623 | ||
624 | ASSERT_RTNL(); | |
625 | ||
626 | sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid); | |
b34939b9 AVS |
627 | if (!sched_scan_req) |
628 | return -ENOENT; | |
ca986ad9 AVS |
629 | |
630 | return cfg80211_stop_sched_scan_req(rdev, sched_scan_req, | |
631 | driver_initiated); | |
632 | } | |
633 | ||
1b8ec87a | 634 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
635 | unsigned long age_secs) |
636 | { | |
637 | struct cfg80211_internal_bss *bss; | |
638 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
639 | ||
1b8ec87a ZG |
640 | spin_lock_bh(&rdev->bss_lock); |
641 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 642 | bss->ts -= age_jiffies; |
1b8ec87a | 643 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
644 | } |
645 | ||
1b8ec87a | 646 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 647 | { |
1b8ec87a | 648 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
649 | } |
650 | ||
49a68e0d JB |
651 | const struct element * |
652 | cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len, | |
653 | const u8 *match, unsigned int match_len, | |
654 | unsigned int match_offset) | |
2a519311 | 655 | { |
0f3b07f0 JB |
656 | const struct element *elem; |
657 | ||
0f3b07f0 | 658 | for_each_element_id(elem, eid, ies, len) { |
49a68e0d JB |
659 | if (elem->datalen >= match_offset + match_len && |
660 | !memcmp(elem->data + match_offset, match, match_len)) | |
661 | return elem; | |
2a519311 | 662 | } |
fbd05e4a LC |
663 | |
664 | return NULL; | |
2a519311 | 665 | } |
49a68e0d | 666 | EXPORT_SYMBOL(cfg80211_find_elem_match); |
2a519311 | 667 | |
49a68e0d JB |
668 | const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type, |
669 | const u8 *ies, | |
670 | unsigned int len) | |
0c28ec58 | 671 | { |
49a68e0d | 672 | const struct element *elem; |
fbd05e4a LC |
673 | u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; |
674 | int match_len = (oui_type < 0) ? 3 : sizeof(match); | |
0c28ec58 | 675 | |
9e9ea439 EG |
676 | if (WARN_ON(oui_type > 0xff)) |
677 | return NULL; | |
678 | ||
49a68e0d JB |
679 | elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, |
680 | match, match_len, 0); | |
6719429d | 681 | |
49a68e0d | 682 | if (!elem || elem->datalen < 4) |
fbd05e4a | 683 | return NULL; |
6719429d | 684 | |
49a68e0d | 685 | return elem; |
0c28ec58 | 686 | } |
49a68e0d | 687 | EXPORT_SYMBOL(cfg80211_find_vendor_elem); |
0c28ec58 | 688 | |
4593c4cb JB |
689 | /** |
690 | * enum bss_compare_mode - BSS compare mode | |
691 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
692 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
693 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
694 | */ | |
695 | enum bss_compare_mode { | |
696 | BSS_CMP_REGULAR, | |
697 | BSS_CMP_HIDE_ZLEN, | |
698 | BSS_CMP_HIDE_NUL, | |
699 | }; | |
700 | ||
dd9dfb9f | 701 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 702 | struct cfg80211_bss *b, |
4593c4cb | 703 | enum bss_compare_mode mode) |
dd9dfb9f | 704 | { |
9caf0364 | 705 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
706 | const u8 *ie1 = NULL; |
707 | const u8 *ie2 = NULL; | |
5622f5bb | 708 | int i, r; |
dd9dfb9f | 709 | |
3af6341c JB |
710 | if (a->channel != b->channel) |
711 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 712 | |
9caf0364 JB |
713 | a_ies = rcu_access_pointer(a->ies); |
714 | if (!a_ies) | |
715 | return -1; | |
716 | b_ies = rcu_access_pointer(b->ies); | |
717 | if (!b_ies) | |
718 | return 1; | |
719 | ||
3af6341c JB |
720 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
721 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
722 | a_ies->data, a_ies->len); | |
723 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
724 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
725 | b_ies->data, b_ies->len); | |
726 | if (ie1 && ie2) { | |
727 | int mesh_id_cmp; | |
728 | ||
729 | if (ie1[1] == ie2[1]) | |
730 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
731 | else | |
732 | mesh_id_cmp = ie2[1] - ie1[1]; | |
733 | ||
734 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
735 | a_ies->data, a_ies->len); | |
736 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
737 | b_ies->data, b_ies->len); | |
738 | if (ie1 && ie2) { | |
739 | if (mesh_id_cmp) | |
740 | return mesh_id_cmp; | |
741 | if (ie1[1] != ie2[1]) | |
742 | return ie2[1] - ie1[1]; | |
743 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
744 | } | |
745 | } | |
746 | ||
3af6341c JB |
747 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
748 | if (r) | |
749 | return r; | |
750 | ||
9caf0364 JB |
751 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
752 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 753 | |
5622f5bb JB |
754 | if (!ie1 && !ie2) |
755 | return 0; | |
756 | ||
f94f8b16 | 757 | /* |
5622f5bb JB |
758 | * Note that with "hide_ssid", the function returns a match if |
759 | * the already-present BSS ("b") is a hidden SSID beacon for | |
760 | * the new BSS ("a"). | |
f94f8b16 | 761 | */ |
dd9dfb9f DT |
762 | |
763 | /* sort missing IE before (left of) present IE */ | |
764 | if (!ie1) | |
765 | return -1; | |
766 | if (!ie2) | |
767 | return 1; | |
768 | ||
4593c4cb JB |
769 | switch (mode) { |
770 | case BSS_CMP_HIDE_ZLEN: | |
771 | /* | |
772 | * In ZLEN mode we assume the BSS entry we're | |
773 | * looking for has a zero-length SSID. So if | |
774 | * the one we're looking at right now has that, | |
775 | * return 0. Otherwise, return the difference | |
776 | * in length, but since we're looking for the | |
777 | * 0-length it's really equivalent to returning | |
778 | * the length of the one we're looking at. | |
779 | * | |
780 | * No content comparison is needed as we assume | |
781 | * the content length is zero. | |
782 | */ | |
783 | return ie2[1]; | |
784 | case BSS_CMP_REGULAR: | |
785 | default: | |
786 | /* sort by length first, then by contents */ | |
787 | if (ie1[1] != ie2[1]) | |
788 | return ie2[1] - ie1[1]; | |
5622f5bb | 789 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
790 | case BSS_CMP_HIDE_NUL: |
791 | if (ie1[1] != ie2[1]) | |
792 | return ie2[1] - ie1[1]; | |
793 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
794 | for (i = 0; i < ie2[1]; i++) | |
795 | if (ie2[i + 2]) | |
796 | return -1; | |
797 | return 0; | |
798 | } | |
dd9dfb9f DT |
799 | } |
800 | ||
6eb18137 | 801 | static bool cfg80211_bss_type_match(u16 capability, |
57fbcce3 | 802 | enum nl80211_band band, |
6eb18137 DL |
803 | enum ieee80211_bss_type bss_type) |
804 | { | |
805 | bool ret = true; | |
806 | u16 mask, val; | |
807 | ||
808 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
809 | return ret; | |
810 | ||
57fbcce3 | 811 | if (band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
812 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
813 | switch (bss_type) { | |
814 | case IEEE80211_BSS_TYPE_ESS: | |
815 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
816 | break; | |
817 | case IEEE80211_BSS_TYPE_PBSS: | |
818 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
819 | break; | |
820 | case IEEE80211_BSS_TYPE_IBSS: | |
821 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
822 | break; | |
823 | default: | |
824 | return false; | |
825 | } | |
826 | } else { | |
827 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
828 | switch (bss_type) { | |
829 | case IEEE80211_BSS_TYPE_ESS: | |
830 | val = WLAN_CAPABILITY_ESS; | |
831 | break; | |
832 | case IEEE80211_BSS_TYPE_IBSS: | |
833 | val = WLAN_CAPABILITY_IBSS; | |
834 | break; | |
835 | case IEEE80211_BSS_TYPE_MBSS: | |
836 | val = 0; | |
837 | break; | |
838 | default: | |
839 | return false; | |
840 | } | |
841 | } | |
842 | ||
843 | ret = ((capability & mask) == val); | |
844 | return ret; | |
845 | } | |
846 | ||
0e3a39b5 | 847 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 JB |
848 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
849 | struct ieee80211_channel *channel, | |
850 | const u8 *bssid, | |
79420f09 | 851 | const u8 *ssid, size_t ssid_len, |
6eb18137 DL |
852 | enum ieee80211_bss_type bss_type, |
853 | enum ieee80211_privacy privacy) | |
2a519311 | 854 | { |
f26cbf40 | 855 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 856 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 857 | unsigned long now = jiffies; |
6eb18137 | 858 | int bss_privacy; |
2a519311 | 859 | |
6eb18137 DL |
860 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
861 | privacy); | |
4ee3e063 | 862 | |
1b8ec87a | 863 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 864 | |
1b8ec87a | 865 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
866 | if (!cfg80211_bss_type_match(bss->pub.capability, |
867 | bss->pub.channel->band, bss_type)) | |
868 | continue; | |
869 | ||
870 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
871 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
872 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 873 | continue; |
2a519311 JB |
874 | if (channel && bss->pub.channel != channel) |
875 | continue; | |
c14a7400 JB |
876 | if (!is_valid_ether_addr(bss->pub.bssid)) |
877 | continue; | |
ccb6c136 JB |
878 | /* Don't get expired BSS structs */ |
879 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
880 | !atomic_read(&bss->hold)) | |
881 | continue; | |
2a519311 JB |
882 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
883 | res = bss; | |
1b8ec87a | 884 | bss_ref_get(rdev, res); |
2a519311 JB |
885 | break; |
886 | } | |
887 | } | |
888 | ||
1b8ec87a | 889 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
890 | if (!res) |
891 | return NULL; | |
4ee3e063 | 892 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
893 | return &res->pub; |
894 | } | |
895 | EXPORT_SYMBOL(cfg80211_get_bss); | |
896 | ||
1b8ec87a | 897 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
898 | struct cfg80211_internal_bss *bss) |
899 | { | |
1b8ec87a | 900 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
901 | struct rb_node *parent = NULL; |
902 | struct cfg80211_internal_bss *tbss; | |
903 | int cmp; | |
904 | ||
905 | while (*p) { | |
906 | parent = *p; | |
907 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
908 | ||
4593c4cb | 909 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
910 | |
911 | if (WARN_ON(!cmp)) { | |
912 | /* will sort of leak this BSS */ | |
913 | return; | |
914 | } | |
915 | ||
916 | if (cmp < 0) | |
917 | p = &(*p)->rb_left; | |
918 | else | |
919 | p = &(*p)->rb_right; | |
920 | } | |
921 | ||
922 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 923 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
924 | } |
925 | ||
926 | static struct cfg80211_internal_bss * | |
1b8ec87a | 927 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 928 | struct cfg80211_internal_bss *res, |
4593c4cb | 929 | enum bss_compare_mode mode) |
dd9dfb9f | 930 | { |
1b8ec87a | 931 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
932 | struct cfg80211_internal_bss *bss; |
933 | int r; | |
934 | ||
935 | while (n) { | |
936 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 937 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
938 | |
939 | if (r == 0) | |
940 | return bss; | |
941 | else if (r < 0) | |
942 | n = n->rb_left; | |
943 | else | |
944 | n = n->rb_right; | |
945 | } | |
946 | ||
947 | return NULL; | |
948 | } | |
949 | ||
1b8ec87a | 950 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 951 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 952 | { |
9caf0364 | 953 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
954 | struct cfg80211_internal_bss *bss; |
955 | const u8 *ie; | |
956 | int i, ssidlen; | |
957 | u8 fold = 0; | |
9853a55e | 958 | u32 n_entries = 0; |
9caf0364 | 959 | |
776b3580 | 960 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 961 | if (WARN_ON(!ies)) |
776b3580 | 962 | return false; |
dd9dfb9f | 963 | |
776b3580 JB |
964 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
965 | if (!ie) { | |
966 | /* nothing to do */ | |
967 | return true; | |
968 | } | |
969 | ||
970 | ssidlen = ie[1]; | |
971 | for (i = 0; i < ssidlen; i++) | |
972 | fold |= ie[2 + i]; | |
973 | ||
974 | if (fold) { | |
975 | /* not a hidden SSID */ | |
976 | return true; | |
977 | } | |
978 | ||
979 | /* This is the bad part ... */ | |
980 | ||
1b8ec87a | 981 | list_for_each_entry(bss, &rdev->bss_list, list) { |
9853a55e JB |
982 | /* |
983 | * we're iterating all the entries anyway, so take the | |
984 | * opportunity to validate the list length accounting | |
985 | */ | |
986 | n_entries++; | |
987 | ||
776b3580 JB |
988 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
989 | continue; | |
990 | if (bss->pub.channel != new->pub.channel) | |
991 | continue; | |
dcd6eac1 SW |
992 | if (bss->pub.scan_width != new->pub.scan_width) |
993 | continue; | |
776b3580 JB |
994 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
995 | continue; | |
996 | ies = rcu_access_pointer(bss->pub.ies); | |
997 | if (!ies) | |
998 | continue; | |
999 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
1000 | if (!ie) | |
1001 | continue; | |
1002 | if (ssidlen && ie[1] != ssidlen) | |
1003 | continue; | |
776b3580 JB |
1004 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
1005 | continue; | |
1006 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
1007 | list_del(&bss->hidden_list); | |
1008 | /* combine them */ | |
1009 | list_add(&bss->hidden_list, &new->hidden_list); | |
1010 | bss->pub.hidden_beacon_bss = &new->pub; | |
1011 | new->refcount += bss->refcount; | |
1012 | rcu_assign_pointer(bss->pub.beacon_ies, | |
1013 | new->pub.beacon_ies); | |
1014 | } | |
1015 | ||
9853a55e JB |
1016 | WARN_ONCE(n_entries != rdev->bss_entries, |
1017 | "rdev bss entries[%d]/list[len:%d] corruption\n", | |
1018 | rdev->bss_entries, n_entries); | |
1019 | ||
776b3580 | 1020 | return true; |
dd9dfb9f DT |
1021 | } |
1022 | ||
0e3a39b5 | 1023 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 | 1024 | static struct cfg80211_internal_bss * |
1b8ec87a | 1025 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
3afc2167 EG |
1026 | struct cfg80211_internal_bss *tmp, |
1027 | bool signal_valid) | |
2a519311 JB |
1028 | { |
1029 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 1030 | |
9caf0364 | 1031 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 1032 | return NULL; |
2a519311 | 1033 | |
9caf0364 | 1034 | tmp->ts = jiffies; |
2a519311 | 1035 | |
1b8ec87a | 1036 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 1037 | |
9caf0364 | 1038 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
1b8ec87a | 1039 | spin_unlock_bh(&rdev->bss_lock); |
9caf0364 JB |
1040 | return NULL; |
1041 | } | |
1042 | ||
1b8ec87a | 1043 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 1044 | |
cd1658f5 | 1045 | if (found) { |
34a6eddb | 1046 | /* Update IEs */ |
9caf0364 JB |
1047 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
1048 | const struct cfg80211_bss_ies *old; | |
1049 | ||
1050 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 1051 | |
9caf0364 JB |
1052 | rcu_assign_pointer(found->pub.proberesp_ies, |
1053 | tmp->pub.proberesp_ies); | |
34a6eddb | 1054 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
1055 | rcu_assign_pointer(found->pub.ies, |
1056 | tmp->pub.proberesp_ies); | |
1057 | if (old) | |
1058 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
1059 | rcu_head); | |
1060 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
9537f227 | 1061 | const struct cfg80211_bss_ies *old; |
776b3580 JB |
1062 | struct cfg80211_internal_bss *bss; |
1063 | ||
1064 | if (found->pub.hidden_beacon_bss && | |
1065 | !list_empty(&found->hidden_list)) { | |
1345ee6a JB |
1066 | const struct cfg80211_bss_ies *f; |
1067 | ||
776b3580 JB |
1068 | /* |
1069 | * The found BSS struct is one of the probe | |
1070 | * response members of a group, but we're | |
1071 | * receiving a beacon (beacon_ies in the tmp | |
1072 | * bss is used). This can only mean that the | |
1073 | * AP changed its beacon from not having an | |
1074 | * SSID to showing it, which is confusing so | |
1075 | * drop this information. | |
1076 | */ | |
1345ee6a JB |
1077 | |
1078 | f = rcu_access_pointer(tmp->pub.beacon_ies); | |
1079 | kfree_rcu((struct cfg80211_bss_ies *)f, | |
1080 | rcu_head); | |
776b3580 JB |
1081 | goto drop; |
1082 | } | |
915de2ff | 1083 | |
9caf0364 | 1084 | old = rcu_access_pointer(found->pub.beacon_ies); |
9caf0364 JB |
1085 | |
1086 | rcu_assign_pointer(found->pub.beacon_ies, | |
1087 | tmp->pub.beacon_ies); | |
01123e23 SN |
1088 | |
1089 | /* Override IEs if they were from a beacon before */ | |
9537f227 | 1090 | if (old == rcu_access_pointer(found->pub.ies)) |
9caf0364 JB |
1091 | rcu_assign_pointer(found->pub.ies, |
1092 | tmp->pub.beacon_ies); | |
cd1658f5 | 1093 | |
776b3580 JB |
1094 | /* Assign beacon IEs to all sub entries */ |
1095 | list_for_each_entry(bss, &found->hidden_list, | |
1096 | hidden_list) { | |
1097 | const struct cfg80211_bss_ies *ies; | |
1098 | ||
1099 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
1100 | WARN_ON(ies != old); | |
1101 | ||
1102 | rcu_assign_pointer(bss->pub.beacon_ies, | |
1103 | tmp->pub.beacon_ies); | |
1104 | } | |
1105 | ||
9caf0364 JB |
1106 | if (old) |
1107 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
1108 | rcu_head); | |
1109 | } | |
1345ee6a JB |
1110 | |
1111 | found->pub.beacon_interval = tmp->pub.beacon_interval; | |
3afc2167 EG |
1112 | /* |
1113 | * don't update the signal if beacon was heard on | |
1114 | * adjacent channel. | |
1115 | */ | |
1116 | if (signal_valid) | |
1117 | found->pub.signal = tmp->pub.signal; | |
1345ee6a JB |
1118 | found->pub.capability = tmp->pub.capability; |
1119 | found->ts = tmp->ts; | |
6e19bc4b | 1120 | found->ts_boottime = tmp->ts_boottime; |
1d76250b | 1121 | found->parent_tsf = tmp->parent_tsf; |
983dafaa SD |
1122 | found->pub.chains = tmp->pub.chains; |
1123 | memcpy(found->pub.chain_signal, tmp->pub.chain_signal, | |
1124 | IEEE80211_MAX_CHAINS); | |
1d76250b | 1125 | ether_addr_copy(found->parent_bssid, tmp->parent_bssid); |
2a519311 | 1126 | } else { |
9caf0364 | 1127 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 1128 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 1129 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 1130 | |
9caf0364 JB |
1131 | /* |
1132 | * create a copy -- the "res" variable that is passed in | |
1133 | * is allocated on the stack since it's not needed in the | |
1134 | * more common case of an update | |
1135 | */ | |
1b8ec87a | 1136 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
1137 | GFP_ATOMIC); |
1138 | if (!new) { | |
1139 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
1140 | if (ies) | |
1141 | kfree_rcu(ies, rcu_head); | |
1142 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
1143 | if (ies) | |
1144 | kfree_rcu(ies, rcu_head); | |
776b3580 | 1145 | goto drop; |
9caf0364 JB |
1146 | } |
1147 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
1148 | new->refcount = 1; |
1149 | INIT_LIST_HEAD(&new->hidden_list); | |
0b8fb823 | 1150 | INIT_LIST_HEAD(&new->nontrans_list); |
776b3580 JB |
1151 | |
1152 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 1153 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 1154 | if (!hidden) |
1b8ec87a | 1155 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
1156 | BSS_CMP_HIDE_NUL); |
1157 | if (hidden) { | |
1158 | new->pub.hidden_beacon_bss = &hidden->pub; | |
1159 | list_add(&new->hidden_list, | |
1160 | &hidden->hidden_list); | |
1161 | hidden->refcount++; | |
1162 | rcu_assign_pointer(new->pub.beacon_ies, | |
1163 | hidden->pub.beacon_ies); | |
1164 | } | |
1165 | } else { | |
1166 | /* | |
1167 | * Ok so we found a beacon, and don't have an entry. If | |
1168 | * it's a beacon with hidden SSID, we might be in for an | |
1169 | * expensive search for any probe responses that should | |
1170 | * be grouped with this beacon for updates ... | |
1171 | */ | |
1b8ec87a | 1172 | if (!cfg80211_combine_bsses(rdev, new)) { |
776b3580 JB |
1173 | kfree(new); |
1174 | goto drop; | |
1175 | } | |
1176 | } | |
1177 | ||
9853a55e JB |
1178 | if (rdev->bss_entries >= bss_entries_limit && |
1179 | !cfg80211_bss_expire_oldest(rdev)) { | |
1180 | kfree(new); | |
1181 | goto drop; | |
1182 | } | |
1183 | ||
1b8ec87a | 1184 | list_add_tail(&new->list, &rdev->bss_list); |
9853a55e | 1185 | rdev->bss_entries++; |
1b8ec87a | 1186 | rb_insert_bss(rdev, new); |
9caf0364 | 1187 | found = new; |
2a519311 JB |
1188 | } |
1189 | ||
1b8ec87a ZG |
1190 | rdev->bss_generation++; |
1191 | bss_ref_get(rdev, found); | |
1192 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 | 1193 | |
2a519311 | 1194 | return found; |
776b3580 | 1195 | drop: |
1b8ec87a | 1196 | spin_unlock_bh(&rdev->bss_lock); |
776b3580 | 1197 | return NULL; |
2a519311 JB |
1198 | } |
1199 | ||
119f94a6 JM |
1200 | /* |
1201 | * Update RX channel information based on the available frame payload | |
1202 | * information. This is mainly for the 2.4 GHz band where frames can be received | |
1203 | * from neighboring channels and the Beacon frames use the DSSS Parameter Set | |
1204 | * element to indicate the current (transmitting) channel, but this might also | |
1205 | * be needed on other bands if RX frequency does not match with the actual | |
1206 | * operating channel of a BSS. | |
1207 | */ | |
0172bb75 JB |
1208 | static struct ieee80211_channel * |
1209 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
119f94a6 JM |
1210 | struct ieee80211_channel *channel, |
1211 | enum nl80211_bss_scan_width scan_width) | |
0172bb75 JB |
1212 | { |
1213 | const u8 *tmp; | |
1214 | u32 freq; | |
1215 | int channel_number = -1; | |
119f94a6 | 1216 | struct ieee80211_channel *alt_channel; |
0172bb75 JB |
1217 | |
1218 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
1219 | if (tmp && tmp[1] == 1) { | |
1220 | channel_number = tmp[2]; | |
1221 | } else { | |
1222 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
1223 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
1224 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
1225 | ||
1226 | channel_number = htop->primary_chan; | |
1227 | } | |
1228 | } | |
1229 | ||
119f94a6 JM |
1230 | if (channel_number < 0) { |
1231 | /* No channel information in frame payload */ | |
0172bb75 | 1232 | return channel; |
119f94a6 | 1233 | } |
0172bb75 JB |
1234 | |
1235 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
119f94a6 JM |
1236 | alt_channel = ieee80211_get_channel(wiphy, freq); |
1237 | if (!alt_channel) { | |
1238 | if (channel->band == NL80211_BAND_2GHZ) { | |
1239 | /* | |
1240 | * Better not allow unexpected channels when that could | |
1241 | * be going beyond the 1-11 range (e.g., discovering | |
1242 | * BSS on channel 12 when radio is configured for | |
1243 | * channel 11. | |
1244 | */ | |
1245 | return NULL; | |
1246 | } | |
1247 | ||
1248 | /* No match for the payload channel number - ignore it */ | |
1249 | return channel; | |
1250 | } | |
1251 | ||
1252 | if (scan_width == NL80211_BSS_CHAN_WIDTH_10 || | |
1253 | scan_width == NL80211_BSS_CHAN_WIDTH_5) { | |
1254 | /* | |
1255 | * Ignore channel number in 5 and 10 MHz channels where there | |
1256 | * may not be an n:1 or 1:n mapping between frequencies and | |
1257 | * channel numbers. | |
1258 | */ | |
1259 | return channel; | |
1260 | } | |
1261 | ||
1262 | /* | |
1263 | * Use the channel determined through the payload channel number | |
1264 | * instead of the RX channel reported by the driver. | |
1265 | */ | |
1266 | if (alt_channel->flags & IEEE80211_CHAN_DISABLED) | |
0172bb75 | 1267 | return NULL; |
119f94a6 | 1268 | return alt_channel; |
0172bb75 JB |
1269 | } |
1270 | ||
0e3a39b5 | 1271 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
0b8fb823 PX |
1272 | static struct cfg80211_bss * |
1273 | cfg80211_inform_single_bss_data(struct wiphy *wiphy, | |
1274 | struct cfg80211_inform_bss *data, | |
1275 | enum cfg80211_bss_frame_type ftype, | |
1276 | const u8 *bssid, u64 tsf, u16 capability, | |
1277 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
1278 | struct cfg80211_bss *trans_bss, | |
1279 | gfp_t gfp) | |
06aa7afa | 1280 | { |
0b8fb823 | 1281 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
9caf0364 | 1282 | struct cfg80211_bss_ies *ies; |
3afc2167 | 1283 | struct ieee80211_channel *channel; |
0b8fb823 | 1284 | struct cfg80211_internal_bss tmp = {}, *res, *trans_internal; |
6eb18137 | 1285 | int bss_type; |
67af9811 | 1286 | bool signal_valid; |
06aa7afa JK |
1287 | |
1288 | if (WARN_ON(!wiphy)) | |
1289 | return NULL; | |
1290 | ||
22fe88d3 | 1291 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1292 | (data->signal < 0 || data->signal > 100))) |
06aa7afa JK |
1293 | return NULL; |
1294 | ||
119f94a6 JM |
1295 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan, |
1296 | data->scan_width); | |
0172bb75 JB |
1297 | if (!channel) |
1298 | return NULL; | |
1299 | ||
9caf0364 JB |
1300 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
1301 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1302 | tmp.pub.scan_width = data->scan_width; |
1303 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1304 | tmp.pub.beacon_interval = beacon_interval; |
1305 | tmp.pub.capability = capability; | |
6e19bc4b DS |
1306 | tmp.ts_boottime = data->boottime_ns; |
1307 | ||
34a6eddb | 1308 | /* |
5bc8c1f2 | 1309 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
1310 | * Response frame, we need to pick one of the options and only use it |
1311 | * with the driver that does not provide the full Beacon/Probe Response | |
1312 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 1313 | * override the IEs pointer should we have received an earlier |
9caf0364 | 1314 | * indication of Probe Response data. |
34a6eddb | 1315 | */ |
0e227084 | 1316 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 JB |
1317 | if (!ies) |
1318 | return NULL; | |
1319 | ies->len = ielen; | |
8cef2c9d | 1320 | ies->tsf = tsf; |
0e227084 | 1321 | ies->from_beacon = false; |
9caf0364 | 1322 | memcpy(ies->data, ie, ielen); |
06aa7afa | 1323 | |
5bc8c1f2 JB |
1324 | switch (ftype) { |
1325 | case CFG80211_BSS_FTYPE_BEACON: | |
1326 | ies->from_beacon = true; | |
925b5978 | 1327 | /* fall through */ |
5bc8c1f2 JB |
1328 | case CFG80211_BSS_FTYPE_UNKNOWN: |
1329 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1330 | break; | |
1331 | case CFG80211_BSS_FTYPE_PRESP: | |
1332 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1333 | break; | |
1334 | } | |
9caf0364 | 1335 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 1336 | |
6e19bc4b | 1337 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1338 | wiphy->max_adj_channel_rssi_comp; |
1339 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
06aa7afa JK |
1340 | if (!res) |
1341 | return NULL; | |
1342 | ||
57fbcce3 | 1343 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1344 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1345 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1346 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1347 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1348 | } else { | |
1349 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1350 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1351 | } | |
06aa7afa | 1352 | |
0b8fb823 PX |
1353 | if (trans_bss) { |
1354 | /* this is a nontransmitting bss, we need to add it to | |
1355 | * transmitting bss' list if it is not there | |
1356 | */ | |
1357 | trans_internal = container_of(trans_bss, | |
1358 | struct cfg80211_internal_bss, | |
1359 | pub); | |
1360 | if (cfg80211_add_nontrans_list(trans_internal, res)) { | |
1361 | if (__cfg80211_unlink_bss(rdev, res)) | |
1362 | rdev->bss_generation++; | |
1363 | } | |
1364 | } | |
1365 | ||
4ee3e063 | 1366 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
1367 | /* cfg80211_bss_update gives us a referenced result */ |
1368 | return &res->pub; | |
1369 | } | |
06aa7afa | 1370 | |
0b8fb823 PX |
1371 | static void cfg80211_parse_mbssid_data(struct wiphy *wiphy, |
1372 | struct cfg80211_inform_bss *data, | |
1373 | enum cfg80211_bss_frame_type ftype, | |
1374 | const u8 *bssid, u64 tsf, | |
1375 | u16 beacon_interval, const u8 *ie, | |
1376 | size_t ielen, | |
1377 | struct cfg80211_bss *trans_bss, | |
1378 | gfp_t gfp) | |
1379 | { | |
1c8745f3 JB |
1380 | const u8 *mbssid_index_ie; |
1381 | const struct element *elem, *sub; | |
1382 | size_t new_ie_len; | |
0b8fb823 PX |
1383 | u8 new_bssid[ETH_ALEN]; |
1384 | u8 *new_ie; | |
1385 | u16 capability; | |
1386 | struct cfg80211_bss *bss; | |
1387 | ||
1388 | if (!trans_bss) | |
1389 | return; | |
1390 | if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen)) | |
1391 | return; | |
1392 | ||
0b8fb823 PX |
1393 | new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); |
1394 | if (!new_ie) | |
1395 | return; | |
1396 | ||
1c8745f3 JB |
1397 | for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) { |
1398 | if (elem->datalen < 4) | |
1399 | continue; | |
1400 | for_each_element(sub, elem->data + 1, elem->datalen - 1) { | |
1401 | if (sub->id != 0 || sub->datalen < 4) { | |
0b8fb823 PX |
1402 | /* not a valid BSS profile */ |
1403 | continue; | |
1404 | } | |
1405 | ||
1c8745f3 JB |
1406 | if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP || |
1407 | sub->data[1] != 2) { | |
0b8fb823 PX |
1408 | /* The first element within the Nontransmitted |
1409 | * BSSID Profile is not the Nontransmitted | |
1410 | * BSSID Capability element. | |
1411 | */ | |
1412 | continue; | |
1413 | } | |
1414 | ||
1415 | /* found a Nontransmitted BSSID Profile */ | |
1416 | mbssid_index_ie = cfg80211_find_ie | |
1417 | (WLAN_EID_MULTI_BSSID_IDX, | |
1c8745f3 | 1418 | sub->data, sub->datalen); |
0b8fb823 PX |
1419 | if (!mbssid_index_ie || mbssid_index_ie[1] < 1 || |
1420 | mbssid_index_ie[2] == 0) { | |
1421 | /* No valid Multiple BSSID-Index element */ | |
1422 | continue; | |
1423 | } | |
1424 | ||
1c8745f3 | 1425 | cfg80211_gen_new_bssid(bssid, elem->data[0], |
0b8fb823 PX |
1426 | mbssid_index_ie[2], |
1427 | new_bssid); | |
1428 | memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); | |
1c8745f3 JB |
1429 | new_ie_len = cfg80211_gen_new_ie(ie, ielen, sub->data, |
1430 | sub->datalen, new_ie, | |
0b8fb823 PX |
1431 | gfp); |
1432 | if (!new_ie_len) | |
1433 | continue; | |
1434 | ||
1c8745f3 | 1435 | capability = get_unaligned_le16(sub->data + 2); |
0b8fb823 PX |
1436 | bss = cfg80211_inform_single_bss_data(wiphy, data, |
1437 | ftype, | |
1438 | new_bssid, tsf, | |
1439 | capability, | |
1440 | beacon_interval, | |
1441 | new_ie, | |
1442 | new_ie_len, | |
1443 | trans_bss, gfp); | |
1444 | if (!bss) | |
1445 | break; | |
1446 | cfg80211_put_bss(wiphy, bss); | |
1447 | } | |
0b8fb823 PX |
1448 | } |
1449 | ||
1450 | kfree(new_ie); | |
1451 | } | |
1452 | ||
2a519311 | 1453 | struct cfg80211_bss * |
0b8fb823 PX |
1454 | cfg80211_inform_bss_data(struct wiphy *wiphy, |
1455 | struct cfg80211_inform_bss *data, | |
1456 | enum cfg80211_bss_frame_type ftype, | |
1457 | const u8 *bssid, u64 tsf, u16 capability, | |
1458 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
1459 | gfp_t gfp) | |
1460 | { | |
1461 | struct cfg80211_bss *res; | |
1462 | ||
1463 | res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf, | |
1464 | capability, beacon_interval, ie, | |
1465 | ielen, NULL, gfp); | |
1466 | cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf, | |
1467 | beacon_interval, ie, ielen, res, gfp); | |
1468 | return res; | |
1469 | } | |
1470 | EXPORT_SYMBOL(cfg80211_inform_bss_data); | |
1471 | ||
1472 | static void | |
1473 | cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy, | |
1474 | struct cfg80211_inform_bss *data, | |
1475 | struct ieee80211_mgmt *mgmt, size_t len, | |
1476 | struct cfg80211_bss *trans_bss, | |
1477 | gfp_t gfp) | |
1478 | { | |
1479 | enum cfg80211_bss_frame_type ftype; | |
1480 | const u8 *ie = mgmt->u.probe_resp.variable; | |
1481 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
1482 | u.probe_resp.variable); | |
1483 | ||
1484 | ftype = ieee80211_is_beacon(mgmt->frame_control) ? | |
1485 | CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP; | |
1486 | ||
1487 | cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid, | |
1488 | le64_to_cpu(mgmt->u.probe_resp.timestamp), | |
1489 | le16_to_cpu(mgmt->u.probe_resp.beacon_int), | |
1490 | ie, ielen, trans_bss, gfp); | |
1491 | } | |
1492 | ||
1493 | static void | |
1494 | cfg80211_update_notlisted_nontrans(struct wiphy *wiphy, | |
1495 | struct cfg80211_internal_bss *nontrans_bss, | |
1496 | struct ieee80211_mgmt *mgmt, size_t len, | |
1497 | gfp_t gfp) | |
1498 | { | |
1499 | u8 *ie, *new_ie, *pos; | |
1500 | const u8 *nontrans_ssid, *trans_ssid, *mbssid; | |
1501 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
1502 | u.probe_resp.variable); | |
1503 | size_t new_ie_len; | |
1504 | struct cfg80211_bss_ies *new_ies; | |
1505 | const struct cfg80211_bss_ies *old; | |
1506 | u8 cpy_len; | |
1507 | ||
1508 | ie = mgmt->u.probe_resp.variable; | |
1509 | ||
1510 | new_ie_len = ielen; | |
1511 | trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen); | |
1512 | if (!trans_ssid) | |
1513 | return; | |
1514 | new_ie_len -= trans_ssid[1]; | |
1515 | mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen); | |
1516 | if (!mbssid) | |
1517 | return; | |
1518 | new_ie_len -= mbssid[1]; | |
1519 | rcu_read_lock(); | |
1520 | nontrans_ssid = ieee80211_bss_get_ie(&nontrans_bss->pub, WLAN_EID_SSID); | |
1521 | if (!nontrans_ssid) { | |
1522 | rcu_read_unlock(); | |
1523 | return; | |
1524 | } | |
1525 | new_ie_len += nontrans_ssid[1]; | |
1526 | rcu_read_unlock(); | |
1527 | ||
1528 | /* generate new ie for nontrans BSS | |
1529 | * 1. replace SSID with nontrans BSS' SSID | |
1530 | * 2. skip MBSSID IE | |
1531 | */ | |
1532 | new_ie = kzalloc(new_ie_len, gfp); | |
1533 | if (!new_ie) | |
1534 | return; | |
1535 | new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, gfp); | |
1536 | if (!new_ies) { | |
1537 | kfree(new_ie); | |
1538 | return; | |
1539 | } | |
1540 | ||
1541 | pos = new_ie; | |
1542 | ||
1543 | /* copy the nontransmitted SSID */ | |
1544 | cpy_len = nontrans_ssid[1] + 2; | |
1545 | memcpy(pos, nontrans_ssid, cpy_len); | |
1546 | pos += cpy_len; | |
1547 | /* copy the IEs between SSID and MBSSID */ | |
1548 | cpy_len = trans_ssid[1] + 2; | |
1549 | memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len))); | |
1550 | pos += (mbssid - (trans_ssid + cpy_len)); | |
1551 | /* copy the IEs after MBSSID */ | |
1552 | cpy_len = mbssid[1] + 2; | |
1553 | memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len))); | |
1554 | ||
1555 | /* update ie */ | |
1556 | new_ies->len = new_ie_len; | |
1557 | new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
1558 | new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); | |
1559 | memcpy(new_ies->data, new_ie, new_ie_len); | |
1560 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { | |
1561 | old = rcu_access_pointer(nontrans_bss->pub.proberesp_ies); | |
1562 | rcu_assign_pointer(nontrans_bss->pub.proberesp_ies, new_ies); | |
1563 | rcu_assign_pointer(nontrans_bss->pub.ies, new_ies); | |
1564 | if (old) | |
1565 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1566 | } else { | |
1567 | old = rcu_access_pointer(nontrans_bss->pub.beacon_ies); | |
1568 | rcu_assign_pointer(nontrans_bss->pub.beacon_ies, new_ies); | |
1569 | rcu_assign_pointer(nontrans_bss->pub.ies, new_ies); | |
1570 | if (old) | |
1571 | kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); | |
1572 | } | |
1573 | } | |
6e19bc4b | 1574 | |
0b8fb823 PX |
1575 | /* cfg80211_inform_bss_width_frame helper */ |
1576 | static struct cfg80211_bss * | |
1577 | cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy, | |
1578 | struct cfg80211_inform_bss *data, | |
1579 | struct ieee80211_mgmt *mgmt, size_t len, | |
1580 | struct cfg80211_bss *trans_bss, | |
1581 | gfp_t gfp) | |
2a519311 | 1582 | { |
9caf0364 JB |
1583 | struct cfg80211_internal_bss tmp = {}, *res; |
1584 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 1585 | struct ieee80211_channel *channel; |
67af9811 | 1586 | bool signal_valid; |
2a519311 JB |
1587 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
1588 | u.probe_resp.variable); | |
6eb18137 | 1589 | int bss_type; |
bef9bacc | 1590 | |
0172bb75 JB |
1591 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
1592 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
1593 | ||
6e19bc4b | 1594 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
4ee3e063 | 1595 | |
bef9bacc MK |
1596 | if (WARN_ON(!mgmt)) |
1597 | return NULL; | |
1598 | ||
1599 | if (WARN_ON(!wiphy)) | |
1600 | return NULL; | |
2a519311 | 1601 | |
22fe88d3 | 1602 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1603 | (data->signal < 0 || data->signal > 100))) |
2a519311 JB |
1604 | return NULL; |
1605 | ||
bef9bacc | 1606 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
1607 | return NULL; |
1608 | ||
0172bb75 | 1609 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
119f94a6 | 1610 | ielen, data->chan, data->scan_width); |
0172bb75 JB |
1611 | if (!channel) |
1612 | return NULL; | |
1613 | ||
0e227084 | 1614 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 1615 | if (!ies) |
2a519311 | 1616 | return NULL; |
9caf0364 | 1617 | ies->len = ielen; |
8cef2c9d | 1618 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
0e227084 | 1619 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); |
9caf0364 | 1620 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
2a519311 | 1621 | |
9caf0364 JB |
1622 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
1623 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1624 | else | |
1625 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1626 | rcu_assign_pointer(tmp.pub.ies, ies); | |
505a2e88 | 1627 | |
9caf0364 JB |
1628 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); |
1629 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1630 | tmp.pub.scan_width = data->scan_width; |
1631 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1632 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
1633 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
6e19bc4b | 1634 | tmp.ts_boottime = data->boottime_ns; |
1d76250b | 1635 | tmp.parent_tsf = data->parent_tsf; |
983dafaa SD |
1636 | tmp.pub.chains = data->chains; |
1637 | memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS); | |
1d76250b | 1638 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); |
9caf0364 | 1639 | |
6e19bc4b | 1640 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1641 | wiphy->max_adj_channel_rssi_comp; |
1642 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
2a519311 JB |
1643 | if (!res) |
1644 | return NULL; | |
1645 | ||
57fbcce3 | 1646 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1647 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1648 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1649 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1650 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1651 | } else { | |
1652 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1653 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1654 | } | |
e38f8a7a | 1655 | |
4ee3e063 | 1656 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1657 | /* cfg80211_bss_update gives us a referenced result */ |
1658 | return &res->pub; | |
1659 | } | |
0b8fb823 PX |
1660 | |
1661 | struct cfg80211_bss * | |
1662 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, | |
1663 | struct cfg80211_inform_bss *data, | |
1664 | struct ieee80211_mgmt *mgmt, size_t len, | |
1665 | gfp_t gfp) | |
1666 | { | |
1667 | struct cfg80211_bss *res; | |
1668 | struct cfg80211_internal_bss *trans_bss, *tmp_bss; | |
1669 | const u8 *ie = mgmt->u.probe_resp.variable; | |
1670 | const struct cfg80211_bss_ies *ies1, *ies2; | |
1671 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
1672 | u.probe_resp.variable); | |
1673 | ||
1674 | res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt, | |
1675 | len, NULL, gfp); | |
1676 | if (!res || !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen)) | |
1677 | return res; | |
1678 | ||
1679 | /* process each non-transmitting bss */ | |
1680 | cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len, res, gfp); | |
1681 | ||
1682 | /* check if the res has other nontransmitting bss which is not | |
1683 | * in MBSSID IE | |
1684 | */ | |
1685 | ies1 = rcu_access_pointer(res->ies); | |
1686 | trans_bss = container_of(res, struct cfg80211_internal_bss, pub); | |
1687 | if (!trans_bss) | |
1688 | return res; | |
1689 | ||
1690 | /* go through nontrans_list, if the timestamp of the BSS is | |
1691 | * earlier than the timestamp of the transmitting BSS then | |
1692 | * update it | |
1693 | */ | |
1694 | list_for_each_entry(tmp_bss, &trans_bss->nontrans_list, | |
1695 | nontrans_list) { | |
1696 | ies2 = rcu_access_pointer(tmp_bss->pub.ies); | |
1697 | if (ies2->tsf < ies1->tsf) | |
1698 | cfg80211_update_notlisted_nontrans(wiphy, tmp_bss, | |
1699 | mgmt, len, gfp); | |
1700 | } | |
1701 | ||
1702 | return res; | |
1703 | } | |
6e19bc4b | 1704 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 1705 | |
5b112d3d | 1706 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 1707 | { |
f26cbf40 | 1708 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
1709 | struct cfg80211_internal_bss *bss; |
1710 | ||
1711 | if (!pub) | |
1712 | return; | |
1713 | ||
1714 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1715 | |
1b8ec87a ZG |
1716 | spin_lock_bh(&rdev->bss_lock); |
1717 | bss_ref_get(rdev, bss); | |
1718 | spin_unlock_bh(&rdev->bss_lock); | |
4c0c0b75 JB |
1719 | } |
1720 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
1721 | ||
5b112d3d | 1722 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 1723 | { |
f26cbf40 | 1724 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
1725 | struct cfg80211_internal_bss *bss; |
1726 | ||
1727 | if (!pub) | |
1728 | return; | |
1729 | ||
1730 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1731 | |
1b8ec87a ZG |
1732 | spin_lock_bh(&rdev->bss_lock); |
1733 | bss_ref_put(rdev, bss); | |
1734 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 JB |
1735 | } |
1736 | EXPORT_SYMBOL(cfg80211_put_bss); | |
1737 | ||
d491af19 JB |
1738 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1739 | { | |
f26cbf40 | 1740 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
0b8fb823 | 1741 | struct cfg80211_internal_bss *bss, *nontrans_bss, *tmp; |
d491af19 JB |
1742 | |
1743 | if (WARN_ON(!pub)) | |
1744 | return; | |
1745 | ||
1746 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
1747 | ||
1b8ec87a | 1748 | spin_lock_bh(&rdev->bss_lock); |
3207390a | 1749 | if (!list_empty(&bss->list)) { |
0b8fb823 PX |
1750 | list_for_each_entry_safe(nontrans_bss, tmp, |
1751 | &bss->nontrans_list, | |
1752 | nontrans_list) { | |
1753 | if (__cfg80211_unlink_bss(rdev, nontrans_bss)) | |
1754 | rdev->bss_generation++; | |
1755 | } | |
1756 | ||
1b8ec87a ZG |
1757 | if (__cfg80211_unlink_bss(rdev, bss)) |
1758 | rdev->bss_generation++; | |
3207390a | 1759 | } |
1b8ec87a | 1760 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
1761 | } |
1762 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
1763 | ||
3d23e349 | 1764 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
1765 | static struct cfg80211_registered_device * |
1766 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
1767 | { | |
5fe231e8 | 1768 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
1769 | struct net_device *dev; |
1770 | ||
5fe231e8 JB |
1771 | ASSERT_RTNL(); |
1772 | ||
9f419f38 JB |
1773 | dev = dev_get_by_index(net, ifindex); |
1774 | if (!dev) | |
5fe231e8 JB |
1775 | return ERR_PTR(-ENODEV); |
1776 | if (dev->ieee80211_ptr) | |
f26cbf40 | 1777 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 1778 | else |
9f419f38 JB |
1779 | rdev = ERR_PTR(-ENODEV); |
1780 | dev_put(dev); | |
9f419f38 JB |
1781 | return rdev; |
1782 | } | |
1783 | ||
2a519311 JB |
1784 | int cfg80211_wext_siwscan(struct net_device *dev, |
1785 | struct iw_request_info *info, | |
1786 | union iwreq_data *wrqu, char *extra) | |
1787 | { | |
1788 | struct cfg80211_registered_device *rdev; | |
1789 | struct wiphy *wiphy; | |
1790 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 1791 | struct cfg80211_scan_request *creq = NULL; |
2a519311 | 1792 | int i, err, n_channels = 0; |
57fbcce3 | 1793 | enum nl80211_band band; |
2a519311 JB |
1794 | |
1795 | if (!netif_running(dev)) | |
1796 | return -ENETDOWN; | |
1797 | ||
b2e3abdc HS |
1798 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
1799 | wreq = (struct iw_scan_req *)extra; | |
1800 | ||
463d0183 | 1801 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1802 | |
1803 | if (IS_ERR(rdev)) | |
1804 | return PTR_ERR(rdev); | |
1805 | ||
f9d15d16 | 1806 | if (rdev->scan_req || rdev->scan_msg) { |
2a519311 JB |
1807 | err = -EBUSY; |
1808 | goto out; | |
1809 | } | |
1810 | ||
1811 | wiphy = &rdev->wiphy; | |
1812 | ||
b2e3abdc HS |
1813 | /* Determine number of channels, needed to allocate creq */ |
1814 | if (wreq && wreq->num_channels) | |
1815 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
1816 | else |
1817 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
1818 | |
1819 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1820 | n_channels * sizeof(void *), | |
1821 | GFP_ATOMIC); | |
1822 | if (!creq) { | |
1823 | err = -ENOMEM; | |
1824 | goto out; | |
1825 | } | |
1826 | ||
1827 | creq->wiphy = wiphy; | |
fd014284 | 1828 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1829 | /* SSIDs come after channels */ |
1830 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1831 | creq->n_channels = n_channels; |
1832 | creq->n_ssids = 1; | |
15d6030b | 1833 | creq->scan_start = jiffies; |
2a519311 | 1834 | |
b2e3abdc | 1835 | /* translate "Scan on frequencies" request */ |
2a519311 | 1836 | i = 0; |
57fbcce3 | 1837 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
2a519311 | 1838 | int j; |
584991dc | 1839 | |
2a519311 JB |
1840 | if (!wiphy->bands[band]) |
1841 | continue; | |
584991dc | 1842 | |
2a519311 | 1843 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1844 | /* ignore disabled channels */ |
1845 | if (wiphy->bands[band]->channels[j].flags & | |
1846 | IEEE80211_CHAN_DISABLED) | |
1847 | continue; | |
b2e3abdc HS |
1848 | |
1849 | /* If we have a wireless request structure and the | |
1850 | * wireless request specifies frequencies, then search | |
1851 | * for the matching hardware channel. | |
1852 | */ | |
1853 | if (wreq && wreq->num_channels) { | |
1854 | int k; | |
1855 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1856 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
1857 | struct iw_freq *freq = |
1858 | &wreq->channel_list[k]; | |
1859 | int wext_freq = | |
1860 | cfg80211_wext_freq(freq); | |
1861 | ||
b2e3abdc HS |
1862 | if (wext_freq == wiphy_freq) |
1863 | goto wext_freq_found; | |
1864 | } | |
1865 | goto wext_freq_not_found; | |
1866 | } | |
1867 | ||
1868 | wext_freq_found: | |
2a519311 JB |
1869 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1870 | i++; | |
b2e3abdc | 1871 | wext_freq_not_found: ; |
2a519311 JB |
1872 | } |
1873 | } | |
8862dc5f HS |
1874 | /* No channels found? */ |
1875 | if (!i) { | |
1876 | err = -EINVAL; | |
1877 | goto out; | |
1878 | } | |
2a519311 | 1879 | |
b2e3abdc HS |
1880 | /* Set real number of channels specified in creq->channels[] */ |
1881 | creq->n_channels = i; | |
2a519311 | 1882 | |
b2e3abdc HS |
1883 | /* translate "Scan for SSID" request */ |
1884 | if (wreq) { | |
2a519311 | 1885 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1886 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1887 | err = -EINVAL; | |
1888 | goto out; | |
1889 | } | |
2a519311 JB |
1890 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1891 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1892 | } | |
1893 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1894 | creq->n_ssids = 0; | |
1895 | } | |
1896 | ||
57fbcce3 | 1897 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
a401d2bb JB |
1898 | if (wiphy->bands[i]) |
1899 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1900 | |
818965d3 JM |
1901 | eth_broadcast_addr(creq->bssid); |
1902 | ||
2a519311 | 1903 | rdev->scan_req = creq; |
e35e4d28 | 1904 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1905 | if (err) { |
1906 | rdev->scan_req = NULL; | |
65486c8b | 1907 | /* creq will be freed below */ |
463d0183 | 1908 | } else { |
fd014284 | 1909 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1910 | /* creq now owned by driver */ |
1911 | creq = NULL; | |
463d0183 JB |
1912 | dev_hold(dev); |
1913 | } | |
2a519311 | 1914 | out: |
65486c8b | 1915 | kfree(creq); |
2a519311 JB |
1916 | return err; |
1917 | } | |
2afe38d1 | 1918 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 1919 | |
76a70e9c JM |
1920 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
1921 | const struct cfg80211_bss_ies *ies, | |
1922 | char *current_ev, char *end_buf) | |
2a519311 | 1923 | { |
9caf0364 | 1924 | const u8 *pos, *end, *next; |
2a519311 JB |
1925 | struct iw_event iwe; |
1926 | ||
9caf0364 | 1927 | if (!ies) |
76a70e9c | 1928 | return current_ev; |
2a519311 JB |
1929 | |
1930 | /* | |
1931 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1932 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1933 | */ | |
9caf0364 JB |
1934 | pos = ies->data; |
1935 | end = pos + ies->len; | |
2a519311 JB |
1936 | |
1937 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1938 | next = pos + 2 + pos[1]; | |
1939 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1940 | next = next + 2 + next[1]; | |
1941 | ||
1942 | memset(&iwe, 0, sizeof(iwe)); | |
1943 | iwe.cmd = IWEVGENIE; | |
1944 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
1945 | current_ev = iwe_stream_add_point_check(info, current_ev, |
1946 | end_buf, &iwe, | |
1947 | (void *)pos); | |
1948 | if (IS_ERR(current_ev)) | |
1949 | return current_ev; | |
2a519311 JB |
1950 | pos = next; |
1951 | } | |
1952 | ||
1953 | if (end > pos) { | |
1954 | memset(&iwe, 0, sizeof(iwe)); | |
1955 | iwe.cmd = IWEVGENIE; | |
1956 | iwe.u.data.length = end - pos; | |
76a70e9c JM |
1957 | current_ev = iwe_stream_add_point_check(info, current_ev, |
1958 | end_buf, &iwe, | |
1959 | (void *)pos); | |
1960 | if (IS_ERR(current_ev)) | |
1961 | return current_ev; | |
2a519311 | 1962 | } |
76a70e9c JM |
1963 | |
1964 | return current_ev; | |
2a519311 JB |
1965 | } |
1966 | ||
2a519311 | 1967 | static char * |
77965c97 JB |
1968 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1969 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1970 | char *end_buf) | |
2a519311 | 1971 | { |
9caf0364 | 1972 | const struct cfg80211_bss_ies *ies; |
2a519311 | 1973 | struct iw_event iwe; |
9caf0364 | 1974 | const u8 *ie; |
76a70e9c JM |
1975 | u8 buf[50]; |
1976 | u8 *cfg, *p, *tmp; | |
9caf0364 | 1977 | int rem, i, sig; |
2a519311 JB |
1978 | bool ismesh = false; |
1979 | ||
1980 | memset(&iwe, 0, sizeof(iwe)); | |
1981 | iwe.cmd = SIOCGIWAP; | |
1982 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1983 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
1984 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1985 | IW_EV_ADDR_LEN); | |
1986 | if (IS_ERR(current_ev)) | |
1987 | return current_ev; | |
2a519311 JB |
1988 | |
1989 | memset(&iwe, 0, sizeof(iwe)); | |
1990 | iwe.cmd = SIOCGIWFREQ; | |
1991 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1992 | iwe.u.freq.e = 0; | |
76a70e9c JM |
1993 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1994 | IW_EV_FREQ_LEN); | |
1995 | if (IS_ERR(current_ev)) | |
1996 | return current_ev; | |
2a519311 JB |
1997 | |
1998 | memset(&iwe, 0, sizeof(iwe)); | |
1999 | iwe.cmd = SIOCGIWFREQ; | |
2000 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
2001 | iwe.u.freq.e = 6; | |
76a70e9c JM |
2002 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
2003 | IW_EV_FREQ_LEN); | |
2004 | if (IS_ERR(current_ev)) | |
2005 | return current_ev; | |
2a519311 | 2006 | |
77965c97 | 2007 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
2008 | memset(&iwe, 0, sizeof(iwe)); |
2009 | iwe.cmd = IWEVQUAL; | |
2010 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
2011 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 2012 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 2013 | switch (wiphy->signal_type) { |
2a519311 | 2014 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
2015 | sig = bss->pub.signal / 100; |
2016 | iwe.u.qual.level = sig; | |
2a519311 | 2017 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
2018 | if (sig < -110) /* rather bad */ |
2019 | sig = -110; | |
2020 | else if (sig > -40) /* perfect */ | |
2021 | sig = -40; | |
2022 | /* will give a range of 0 .. 70 */ | |
2023 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
2024 | break; |
2025 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
2026 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
2027 | /* will give range 0 .. 100 */ |
2028 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
2029 | break; |
2030 | default: | |
2031 | /* not reached */ | |
2032 | break; | |
2033 | } | |
76a70e9c JM |
2034 | current_ev = iwe_stream_add_event_check(info, current_ev, |
2035 | end_buf, &iwe, | |
2036 | IW_EV_QUAL_LEN); | |
2037 | if (IS_ERR(current_ev)) | |
2038 | return current_ev; | |
2a519311 JB |
2039 | } |
2040 | ||
2041 | memset(&iwe, 0, sizeof(iwe)); | |
2042 | iwe.cmd = SIOCGIWENCODE; | |
2043 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
2044 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
2045 | else | |
2046 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
2047 | iwe.u.data.length = 0; | |
76a70e9c JM |
2048 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
2049 | &iwe, ""); | |
2050 | if (IS_ERR(current_ev)) | |
2051 | return current_ev; | |
2a519311 | 2052 | |
9caf0364 JB |
2053 | rcu_read_lock(); |
2054 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
2055 | rem = ies->len; |
2056 | ie = ies->data; | |
9caf0364 | 2057 | |
83c7aa1a | 2058 | while (rem >= 2) { |
2a519311 JB |
2059 | /* invalid data */ |
2060 | if (ie[1] > rem - 2) | |
2061 | break; | |
2062 | ||
2063 | switch (ie[0]) { | |
2064 | case WLAN_EID_SSID: | |
2065 | memset(&iwe, 0, sizeof(iwe)); | |
2066 | iwe.cmd = SIOCGIWESSID; | |
2067 | iwe.u.data.length = ie[1]; | |
2068 | iwe.u.data.flags = 1; | |
76a70e9c JM |
2069 | current_ev = iwe_stream_add_point_check(info, |
2070 | current_ev, | |
2071 | end_buf, &iwe, | |
2072 | (u8 *)ie + 2); | |
2073 | if (IS_ERR(current_ev)) | |
2074 | goto unlock; | |
2a519311 JB |
2075 | break; |
2076 | case WLAN_EID_MESH_ID: | |
2077 | memset(&iwe, 0, sizeof(iwe)); | |
2078 | iwe.cmd = SIOCGIWESSID; | |
2079 | iwe.u.data.length = ie[1]; | |
2080 | iwe.u.data.flags = 1; | |
76a70e9c JM |
2081 | current_ev = iwe_stream_add_point_check(info, |
2082 | current_ev, | |
2083 | end_buf, &iwe, | |
2084 | (u8 *)ie + 2); | |
2085 | if (IS_ERR(current_ev)) | |
2086 | goto unlock; | |
2a519311 JB |
2087 | break; |
2088 | case WLAN_EID_MESH_CONFIG: | |
2089 | ismesh = true; | |
136cfa28 | 2090 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 2091 | break; |
9caf0364 | 2092 | cfg = (u8 *)ie + 2; |
2a519311 JB |
2093 | memset(&iwe, 0, sizeof(iwe)); |
2094 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
2095 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
2096 | "0x%02X", cfg[0]); | |
2a519311 | 2097 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2098 | current_ev = iwe_stream_add_point_check(info, |
2099 | current_ev, | |
2100 | end_buf, | |
2101 | &iwe, buf); | |
2102 | if (IS_ERR(current_ev)) | |
2103 | goto unlock; | |
76aa5e70 RP |
2104 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
2105 | cfg[1]); | |
2a519311 | 2106 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2107 | current_ev = iwe_stream_add_point_check(info, |
2108 | current_ev, | |
2109 | end_buf, | |
2110 | &iwe, buf); | |
2111 | if (IS_ERR(current_ev)) | |
2112 | goto unlock; | |
76aa5e70 RP |
2113 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
2114 | cfg[2]); | |
2a519311 | 2115 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2116 | current_ev = iwe_stream_add_point_check(info, |
2117 | current_ev, | |
2118 | end_buf, | |
2119 | &iwe, buf); | |
2120 | if (IS_ERR(current_ev)) | |
2121 | goto unlock; | |
76aa5e70 | 2122 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 | 2123 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2124 | current_ev = iwe_stream_add_point_check(info, |
2125 | current_ev, | |
2126 | end_buf, | |
2127 | &iwe, buf); | |
2128 | if (IS_ERR(current_ev)) | |
2129 | goto unlock; | |
76aa5e70 RP |
2130 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
2131 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
2132 | current_ev = iwe_stream_add_point_check(info, |
2133 | current_ev, | |
2134 | end_buf, | |
2135 | &iwe, buf); | |
2136 | if (IS_ERR(current_ev)) | |
2137 | goto unlock; | |
76aa5e70 RP |
2138 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
2139 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
2140 | current_ev = iwe_stream_add_point_check(info, |
2141 | current_ev, | |
2142 | end_buf, | |
2143 | &iwe, buf); | |
2144 | if (IS_ERR(current_ev)) | |
2145 | goto unlock; | |
76aa5e70 | 2146 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
2a519311 | 2147 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
2148 | current_ev = iwe_stream_add_point_check(info, |
2149 | current_ev, | |
2150 | end_buf, | |
2151 | &iwe, buf); | |
2152 | if (IS_ERR(current_ev)) | |
2153 | goto unlock; | |
2a519311 JB |
2154 | break; |
2155 | case WLAN_EID_SUPP_RATES: | |
2156 | case WLAN_EID_EXT_SUPP_RATES: | |
2157 | /* display all supported rates in readable format */ | |
2158 | p = current_ev + iwe_stream_lcp_len(info); | |
2159 | ||
2160 | memset(&iwe, 0, sizeof(iwe)); | |
2161 | iwe.cmd = SIOCGIWRATE; | |
2162 | /* Those two flags are ignored... */ | |
2163 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
2164 | ||
2165 | for (i = 0; i < ie[1]; i++) { | |
2166 | iwe.u.bitrate.value = | |
2167 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 2168 | tmp = p; |
2a519311 | 2169 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
2170 | end_buf, &iwe, |
2171 | IW_EV_PARAM_LEN); | |
2172 | if (p == tmp) { | |
2173 | current_ev = ERR_PTR(-E2BIG); | |
2174 | goto unlock; | |
2175 | } | |
2a519311 JB |
2176 | } |
2177 | current_ev = p; | |
2178 | break; | |
2179 | } | |
2180 | rem -= ie[1] + 2; | |
2181 | ie += ie[1] + 2; | |
2182 | } | |
2183 | ||
f64f9e71 JP |
2184 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
2185 | ismesh) { | |
2a519311 JB |
2186 | memset(&iwe, 0, sizeof(iwe)); |
2187 | iwe.cmd = SIOCGIWMODE; | |
2188 | if (ismesh) | |
2189 | iwe.u.mode = IW_MODE_MESH; | |
2190 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
2191 | iwe.u.mode = IW_MODE_MASTER; | |
2192 | else | |
2193 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
2194 | current_ev = iwe_stream_add_event_check(info, current_ev, |
2195 | end_buf, &iwe, | |
2196 | IW_EV_UINT_LEN); | |
2197 | if (IS_ERR(current_ev)) | |
2198 | goto unlock; | |
2a519311 JB |
2199 | } |
2200 | ||
76a70e9c JM |
2201 | memset(&iwe, 0, sizeof(iwe)); |
2202 | iwe.cmd = IWEVCUSTOM; | |
2203 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); | |
2204 | iwe.u.data.length = strlen(buf); | |
2205 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, | |
2206 | &iwe, buf); | |
2207 | if (IS_ERR(current_ev)) | |
2208 | goto unlock; | |
2209 | memset(&iwe, 0, sizeof(iwe)); | |
2210 | iwe.cmd = IWEVCUSTOM; | |
2211 | sprintf(buf, " Last beacon: %ums ago", | |
2212 | elapsed_jiffies_msecs(bss->ts)); | |
2213 | iwe.u.data.length = strlen(buf); | |
2214 | current_ev = iwe_stream_add_point_check(info, current_ev, | |
2215 | end_buf, &iwe, buf); | |
2216 | if (IS_ERR(current_ev)) | |
2217 | goto unlock; | |
2218 | ||
2219 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
2220 | ||
2221 | unlock: | |
9caf0364 | 2222 | rcu_read_unlock(); |
2a519311 JB |
2223 | return current_ev; |
2224 | } | |
2225 | ||
2226 | ||
1b8ec87a | 2227 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
2228 | struct iw_request_info *info, |
2229 | char *buf, size_t len) | |
2230 | { | |
2231 | char *current_ev = buf; | |
2232 | char *end_buf = buf + len; | |
2233 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 2234 | int err = 0; |
2a519311 | 2235 | |
1b8ec87a ZG |
2236 | spin_lock_bh(&rdev->bss_lock); |
2237 | cfg80211_bss_expire(rdev); | |
2a519311 | 2238 | |
1b8ec87a | 2239 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 2240 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
2241 | err = -E2BIG; |
2242 | break; | |
2a519311 | 2243 | } |
1b8ec87a | 2244 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 2245 | current_ev, end_buf); |
76a70e9c JM |
2246 | if (IS_ERR(current_ev)) { |
2247 | err = PTR_ERR(current_ev); | |
2248 | break; | |
2249 | } | |
2a519311 | 2250 | } |
1b8ec87a | 2251 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
2252 | |
2253 | if (err) | |
2254 | return err; | |
2a519311 JB |
2255 | return current_ev - buf; |
2256 | } | |
2257 | ||
2258 | ||
2259 | int cfg80211_wext_giwscan(struct net_device *dev, | |
2260 | struct iw_request_info *info, | |
2261 | struct iw_point *data, char *extra) | |
2262 | { | |
2263 | struct cfg80211_registered_device *rdev; | |
2264 | int res; | |
2265 | ||
2266 | if (!netif_running(dev)) | |
2267 | return -ENETDOWN; | |
2268 | ||
463d0183 | 2269 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
2270 | |
2271 | if (IS_ERR(rdev)) | |
2272 | return PTR_ERR(rdev); | |
2273 | ||
f9d15d16 | 2274 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 2275 | return -EAGAIN; |
2a519311 JB |
2276 | |
2277 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
2278 | data->length = 0; | |
2279 | if (res >= 0) { | |
2280 | data->length = res; | |
2281 | res = 0; | |
2282 | } | |
2283 | ||
2a519311 JB |
2284 | return res; |
2285 | } | |
2afe38d1 | 2286 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 2287 | #endif |