]>
Commit | Line | Data |
---|---|---|
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 |
2a519311 JB |
8 | */ |
9 | #include <linux/kernel.h> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
2a519311 JB |
11 | #include <linux/module.h> |
12 | #include <linux/netdevice.h> | |
13 | #include <linux/wireless.h> | |
14 | #include <linux/nl80211.h> | |
15 | #include <linux/etherdevice.h> | |
16 | #include <net/arp.h> | |
17 | #include <net/cfg80211.h> | |
262eb9b2 | 18 | #include <net/cfg80211-wext.h> |
2a519311 JB |
19 | #include <net/iw_handler.h> |
20 | #include "core.h" | |
21 | #include "nl80211.h" | |
a9a11622 | 22 | #include "wext-compat.h" |
e35e4d28 | 23 | #include "rdev-ops.h" |
2a519311 | 24 | |
776b3580 JB |
25 | /** |
26 | * DOC: BSS tree/list structure | |
27 | * | |
28 | * At the top level, the BSS list is kept in both a list in each | |
29 | * registered device (@bss_list) as well as an RB-tree for faster | |
30 | * lookup. In the RB-tree, entries can be looked up using their | |
31 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID | |
32 | * for other BSSes. | |
33 | * | |
34 | * Due to the possibility of hidden SSIDs, there's a second level | |
35 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. | |
36 | * The hidden_list connects all BSSes belonging to a single AP | |
37 | * that has a hidden SSID, and connects beacon and probe response | |
38 | * entries. For a probe response entry for a hidden SSID, the | |
39 | * hidden_beacon_bss pointer points to the BSS struct holding the | |
40 | * beacon's information. | |
41 | * | |
42 | * Reference counting is done for all these references except for | |
43 | * the hidden_list, so that a beacon BSS struct that is otherwise | |
44 | * not referenced has one reference for being on the bss_list and | |
45 | * one for each probe response entry that points to it using the | |
46 | * hidden_beacon_bss pointer. When a BSS struct that has such a | |
47 | * pointer is get/put, the refcount update is also propagated to | |
48 | * the referenced struct, this ensure that it cannot get removed | |
49 | * while somebody is using the probe response version. | |
50 | * | |
51 | * Note that the hidden_beacon_bss pointer never changes, due to | |
52 | * the reference counting. Therefore, no locking is needed for | |
53 | * it. | |
54 | * | |
55 | * Also note that the hidden_beacon_bss pointer is only relevant | |
56 | * if the driver uses something other than the IEs, e.g. private | |
57 | * data stored stored in the BSS struct, since the beacon IEs are | |
58 | * also linked into the probe response struct. | |
59 | */ | |
60 | ||
9853a55e JB |
61 | /* |
62 | * Limit the number of BSS entries stored in mac80211. Each one is | |
63 | * a bit over 4k at most, so this limits to roughly 4-5M of memory. | |
64 | * If somebody wants to really attack this though, they'd likely | |
65 | * use small beacons, and only one type of frame, limiting each of | |
66 | * the entries to a much smaller size (in order to generate more | |
67 | * entries in total, so overhead is bigger.) | |
68 | */ | |
69 | static int bss_entries_limit = 1000; | |
70 | module_param(bss_entries_limit, int, 0644); | |
71 | MODULE_PARM_DESC(bss_entries_limit, | |
72 | "limit to number of scan BSS entries (per wiphy, default 1000)"); | |
73 | ||
f9616e0f | 74 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 75 | |
776b3580 | 76 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 77 | { |
9caf0364 | 78 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
79 | |
80 | if (WARN_ON(atomic_read(&bss->hold))) | |
81 | return; | |
82 | ||
9caf0364 | 83 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 84 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
85 | kfree_rcu(ies, rcu_head); |
86 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
87 | if (ies) | |
88 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 89 | |
776b3580 JB |
90 | /* |
91 | * This happens when the module is removed, it doesn't | |
92 | * really matter any more save for completeness | |
93 | */ | |
94 | if (!list_empty(&bss->hidden_list)) | |
95 | list_del(&bss->hidden_list); | |
96 | ||
e8e27c66 AK |
97 | kfree(bss); |
98 | } | |
99 | ||
1b8ec87a | 100 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
776b3580 | 101 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 102 | { |
1b8ec87a | 103 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
104 | |
105 | bss->refcount++; | |
106 | if (bss->pub.hidden_beacon_bss) { | |
107 | bss = container_of(bss->pub.hidden_beacon_bss, | |
108 | struct cfg80211_internal_bss, | |
109 | pub); | |
110 | bss->refcount++; | |
111 | } | |
0532d4f1 JB |
112 | } |
113 | ||
1b8ec87a | 114 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
776b3580 | 115 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 116 | { |
1b8ec87a | 117 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
118 | |
119 | if (bss->pub.hidden_beacon_bss) { | |
120 | struct cfg80211_internal_bss *hbss; | |
121 | hbss = container_of(bss->pub.hidden_beacon_bss, | |
122 | struct cfg80211_internal_bss, | |
123 | pub); | |
124 | hbss->refcount--; | |
125 | if (hbss->refcount == 0) | |
126 | bss_free(hbss); | |
127 | } | |
128 | bss->refcount--; | |
129 | if (bss->refcount == 0) | |
130 | bss_free(bss); | |
0532d4f1 JB |
131 | } |
132 | ||
1b8ec87a | 133 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
134 | struct cfg80211_internal_bss *bss) |
135 | { | |
1b8ec87a | 136 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 137 | |
776b3580 JB |
138 | if (!list_empty(&bss->hidden_list)) { |
139 | /* | |
140 | * don't remove the beacon entry if it has | |
141 | * probe responses associated with it | |
142 | */ | |
143 | if (!bss->pub.hidden_beacon_bss) | |
144 | return false; | |
145 | /* | |
146 | * if it's a probe response entry break its | |
147 | * link to the other entries in the group | |
148 | */ | |
149 | list_del_init(&bss->hidden_list); | |
150 | } | |
151 | ||
e8e27c66 | 152 | list_del_init(&bss->list); |
1b8ec87a | 153 | rb_erase(&bss->rbn, &rdev->bss_tree); |
9853a55e JB |
154 | rdev->bss_entries--; |
155 | WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list), | |
156 | "rdev bss entries[%d]/list[empty:%d] corruption\n", | |
157 | rdev->bss_entries, list_empty(&rdev->bss_list)); | |
1b8ec87a | 158 | bss_ref_put(rdev, bss); |
776b3580 | 159 | return true; |
e8e27c66 AK |
160 | } |
161 | ||
1b8ec87a | 162 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
163 | unsigned long expire_time) |
164 | { | |
165 | struct cfg80211_internal_bss *bss, *tmp; | |
166 | bool expired = false; | |
167 | ||
1b8ec87a | 168 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 169 | |
1b8ec87a | 170 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
171 | if (atomic_read(&bss->hold)) |
172 | continue; | |
173 | if (!time_after(expire_time, bss->ts)) | |
174 | continue; | |
175 | ||
1b8ec87a | 176 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 177 | expired = true; |
15d6030b SL |
178 | } |
179 | ||
180 | if (expired) | |
1b8ec87a | 181 | rdev->bss_generation++; |
15d6030b SL |
182 | } |
183 | ||
9853a55e JB |
184 | static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) |
185 | { | |
186 | struct cfg80211_internal_bss *bss, *oldest = NULL; | |
187 | bool ret; | |
188 | ||
189 | lockdep_assert_held(&rdev->bss_lock); | |
190 | ||
191 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
192 | if (atomic_read(&bss->hold)) | |
193 | continue; | |
194 | ||
195 | if (!list_empty(&bss->hidden_list) && | |
196 | !bss->pub.hidden_beacon_bss) | |
197 | continue; | |
198 | ||
199 | if (oldest && time_before(oldest->ts, bss->ts)) | |
200 | continue; | |
201 | oldest = bss; | |
202 | } | |
203 | ||
204 | if (WARN_ON(!oldest)) | |
205 | return false; | |
206 | ||
207 | /* | |
208 | * The callers make sure to increase rdev->bss_generation if anything | |
209 | * gets removed (and a new entry added), so there's no need to also do | |
210 | * it here. | |
211 | */ | |
212 | ||
213 | ret = __cfg80211_unlink_bss(rdev, oldest); | |
214 | WARN_ON(!ret); | |
215 | return ret; | |
216 | } | |
217 | ||
f9d15d16 JB |
218 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
219 | bool send_message) | |
2a519311 | 220 | { |
667503dd | 221 | struct cfg80211_scan_request *request; |
fd014284 | 222 | struct wireless_dev *wdev; |
f9d15d16 | 223 | struct sk_buff *msg; |
3d23e349 | 224 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
225 | union iwreq_data wrqu; |
226 | #endif | |
227 | ||
5fe231e8 | 228 | ASSERT_RTNL(); |
01a0ac41 | 229 | |
f9d15d16 | 230 | if (rdev->scan_msg) { |
505a2e88 | 231 | nl80211_send_scan_msg(rdev, rdev->scan_msg); |
f9d15d16 JB |
232 | rdev->scan_msg = NULL; |
233 | return; | |
234 | } | |
667503dd | 235 | |
f9d15d16 | 236 | request = rdev->scan_req; |
01a0ac41 JB |
237 | if (!request) |
238 | return; | |
239 | ||
fd014284 | 240 | wdev = request->wdev; |
2a519311 | 241 | |
6829c878 JB |
242 | /* |
243 | * This must be before sending the other events! | |
244 | * Otherwise, wpa_supplicant gets completely confused with | |
245 | * wext events. | |
246 | */ | |
fd014284 JB |
247 | if (wdev->netdev) |
248 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 249 | |
1d76250b | 250 | if (!request->info.aborted && |
f9d15d16 JB |
251 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
252 | /* flush entries from previous scans */ | |
253 | spin_lock_bh(&rdev->bss_lock); | |
254 | __cfg80211_bss_expire(rdev, request->scan_start); | |
255 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 256 | } |
2a519311 | 257 | |
1d76250b | 258 | msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); |
f9d15d16 | 259 | |
3d23e349 | 260 | #ifdef CONFIG_CFG80211_WEXT |
1d76250b | 261 | if (wdev->netdev && !request->info.aborted) { |
2a519311 JB |
262 | memset(&wrqu, 0, sizeof(wrqu)); |
263 | ||
fd014284 | 264 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
265 | } |
266 | #endif | |
267 | ||
fd014284 JB |
268 | if (wdev->netdev) |
269 | dev_put(wdev->netdev); | |
2a519311 | 270 | |
36e6fea8 | 271 | rdev->scan_req = NULL; |
4a58e7c3 | 272 | kfree(request); |
f9d15d16 JB |
273 | |
274 | if (!send_message) | |
275 | rdev->scan_msg = msg; | |
276 | else | |
505a2e88 | 277 | nl80211_send_scan_msg(rdev, msg); |
2a519311 | 278 | } |
667503dd | 279 | |
36e6fea8 JB |
280 | void __cfg80211_scan_done(struct work_struct *wk) |
281 | { | |
282 | struct cfg80211_registered_device *rdev; | |
283 | ||
284 | rdev = container_of(wk, struct cfg80211_registered_device, | |
285 | scan_done_wk); | |
286 | ||
5fe231e8 | 287 | rtnl_lock(); |
f9d15d16 | 288 | ___cfg80211_scan_done(rdev, true); |
5fe231e8 | 289 | rtnl_unlock(); |
36e6fea8 JB |
290 | } |
291 | ||
1d76250b AS |
292 | void cfg80211_scan_done(struct cfg80211_scan_request *request, |
293 | struct cfg80211_scan_info *info) | |
667503dd | 294 | { |
1d76250b | 295 | trace_cfg80211_scan_done(request, info); |
f26cbf40 | 296 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req); |
667503dd | 297 | |
1d76250b | 298 | request->info = *info; |
5fe231e8 | 299 | request->notified = true; |
f26cbf40 | 300 | queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); |
667503dd | 301 | } |
2a519311 JB |
302 | EXPORT_SYMBOL(cfg80211_scan_done); |
303 | ||
ca986ad9 AVS |
304 | void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev, |
305 | struct cfg80211_sched_scan_request *req) | |
306 | { | |
307 | ASSERT_RTNL(); | |
308 | ||
309 | list_add_rcu(&req->list, &rdev->sched_scan_req_list); | |
310 | } | |
311 | ||
312 | static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev, | |
313 | struct cfg80211_sched_scan_request *req) | |
314 | { | |
315 | ASSERT_RTNL(); | |
316 | ||
317 | list_del_rcu(&req->list); | |
318 | kfree_rcu(req, rcu_head); | |
319 | } | |
320 | ||
321 | static struct cfg80211_sched_scan_request * | |
322 | cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid) | |
323 | { | |
324 | struct cfg80211_sched_scan_request *pos; | |
325 | ||
1b57b621 | 326 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); |
ca986ad9 | 327 | |
1b57b621 | 328 | list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list) { |
ca986ad9 AVS |
329 | if (pos->reqid == reqid) |
330 | return pos; | |
331 | } | |
b34939b9 | 332 | return NULL; |
ca986ad9 AVS |
333 | } |
334 | ||
335 | /* | |
336 | * Determines if a scheduled scan request can be handled. When a legacy | |
337 | * scheduled scan is running no other scheduled scan is allowed regardless | |
338 | * whether the request is for legacy or multi-support scan. When a multi-support | |
339 | * scheduled scan is running a request for legacy scan is not allowed. In this | |
340 | * case a request for multi-support scan can be handled if resources are | |
341 | * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached. | |
342 | */ | |
343 | int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev, | |
344 | bool want_multi) | |
345 | { | |
346 | struct cfg80211_sched_scan_request *pos; | |
347 | int i = 0; | |
348 | ||
349 | list_for_each_entry(pos, &rdev->sched_scan_req_list, list) { | |
350 | /* request id zero means legacy in progress */ | |
351 | if (!i && !pos->reqid) | |
352 | return -EINPROGRESS; | |
353 | i++; | |
354 | } | |
355 | ||
356 | if (i) { | |
357 | /* no legacy allowed when multi request(s) are active */ | |
358 | if (!want_multi) | |
359 | return -EINPROGRESS; | |
360 | ||
361 | /* resource limit reached */ | |
362 | if (i == rdev->wiphy.max_sched_scan_reqs) | |
363 | return -ENOSPC; | |
364 | } | |
365 | return 0; | |
366 | } | |
367 | ||
b34939b9 | 368 | void cfg80211_sched_scan_results_wk(struct work_struct *work) |
807f8a8c LC |
369 | { |
370 | struct cfg80211_registered_device *rdev; | |
b34939b9 | 371 | struct cfg80211_sched_scan_request *req, *tmp; |
807f8a8c | 372 | |
b34939b9 AVS |
373 | rdev = container_of(work, struct cfg80211_registered_device, |
374 | sched_scan_res_wk); | |
807f8a8c | 375 | |
5fe231e8 | 376 | rtnl_lock(); |
b34939b9 AVS |
377 | list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { |
378 | if (req->report_results) { | |
379 | req->report_results = false; | |
380 | if (req->flags & NL80211_SCAN_FLAG_FLUSH) { | |
381 | /* flush entries from previous scans */ | |
382 | spin_lock_bh(&rdev->bss_lock); | |
383 | __cfg80211_bss_expire(rdev, req->scan_start); | |
384 | spin_unlock_bh(&rdev->bss_lock); | |
385 | req->scan_start = jiffies; | |
386 | } | |
387 | nl80211_send_sched_scan(req, | |
388 | NL80211_CMD_SCHED_SCAN_RESULTS); | |
15d6030b | 389 | } |
15d6030b | 390 | } |
5fe231e8 | 391 | rtnl_unlock(); |
807f8a8c LC |
392 | } |
393 | ||
b34939b9 | 394 | void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 395 | { |
ca986ad9 AVS |
396 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
397 | struct cfg80211_sched_scan_request *request; | |
398 | ||
b34939b9 | 399 | trace_cfg80211_sched_scan_results(wiphy, reqid); |
807f8a8c | 400 | /* ignore if we're not scanning */ |
31a60ed1 | 401 | |
1b57b621 | 402 | rcu_read_lock(); |
b34939b9 AVS |
403 | request = cfg80211_find_sched_scan_req(rdev, reqid); |
404 | if (request) { | |
405 | request->report_results = true; | |
406 | queue_work(cfg80211_wq, &rdev->sched_scan_res_wk); | |
407 | } | |
1b57b621 | 408 | rcu_read_unlock(); |
807f8a8c LC |
409 | } |
410 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
411 | ||
b34939b9 | 412 | void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 413 | { |
f26cbf40 | 414 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 415 | |
792e6aa7 EP |
416 | ASSERT_RTNL(); |
417 | ||
b34939b9 | 418 | trace_cfg80211_sched_scan_stopped(wiphy, reqid); |
4ee3e063 | 419 | |
b34939b9 | 420 | __cfg80211_stop_sched_scan(rdev, reqid, true); |
792e6aa7 EP |
421 | } |
422 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl); | |
423 | ||
b34939b9 | 424 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid) |
792e6aa7 EP |
425 | { |
426 | rtnl_lock(); | |
b34939b9 | 427 | cfg80211_sched_scan_stopped_rtnl(wiphy, reqid); |
5fe231e8 | 428 | rtnl_unlock(); |
807f8a8c | 429 | } |
807f8a8c LC |
430 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
431 | ||
ca986ad9 AVS |
432 | int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev, |
433 | struct cfg80211_sched_scan_request *req, | |
434 | bool driver_initiated) | |
807f8a8c | 435 | { |
5fe231e8 | 436 | ASSERT_RTNL(); |
807f8a8c | 437 | |
85a9994a | 438 | if (!driver_initiated) { |
3a3ecf1d | 439 | int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid); |
85a9994a LC |
440 | if (err) |
441 | return err; | |
442 | } | |
807f8a8c | 443 | |
ca986ad9 | 444 | nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED); |
807f8a8c | 445 | |
ca986ad9 | 446 | cfg80211_del_sched_scan_req(rdev, req); |
807f8a8c | 447 | |
3b4670ff | 448 | return 0; |
807f8a8c LC |
449 | } |
450 | ||
ca986ad9 AVS |
451 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
452 | u64 reqid, bool driver_initiated) | |
453 | { | |
454 | struct cfg80211_sched_scan_request *sched_scan_req; | |
455 | ||
456 | ASSERT_RTNL(); | |
457 | ||
458 | sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid); | |
b34939b9 AVS |
459 | if (!sched_scan_req) |
460 | return -ENOENT; | |
ca986ad9 AVS |
461 | |
462 | return cfg80211_stop_sched_scan_req(rdev, sched_scan_req, | |
463 | driver_initiated); | |
464 | } | |
465 | ||
1b8ec87a | 466 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
467 | unsigned long age_secs) |
468 | { | |
469 | struct cfg80211_internal_bss *bss; | |
470 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
471 | ||
1b8ec87a ZG |
472 | spin_lock_bh(&rdev->bss_lock); |
473 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 474 | bss->ts -= age_jiffies; |
1b8ec87a | 475 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
476 | } |
477 | ||
1b8ec87a | 478 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 479 | { |
1b8ec87a | 480 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
481 | } |
482 | ||
fbd05e4a LC |
483 | const u8 *cfg80211_find_ie_match(u8 eid, const u8 *ies, int len, |
484 | const u8 *match, int match_len, | |
485 | int match_offset) | |
2a519311 | 486 | { |
fbd05e4a LC |
487 | /* match_offset can't be smaller than 2, unless match_len is |
488 | * zero, in which case match_offset must be zero as well. | |
489 | */ | |
490 | if (WARN_ON((match_len && match_offset < 2) || | |
491 | (!match_len && match_offset))) | |
492 | return NULL; | |
493 | ||
494 | while (len >= 2 && len >= ies[1] + 2) { | |
495 | if ((ies[0] == eid) && | |
496 | (ies[1] + 2 >= match_offset + match_len) && | |
497 | !memcmp(ies + match_offset, match, match_len)) | |
498 | return ies; | |
499 | ||
2a519311 JB |
500 | len -= ies[1] + 2; |
501 | ies += ies[1] + 2; | |
502 | } | |
fbd05e4a LC |
503 | |
504 | return NULL; | |
2a519311 | 505 | } |
fbd05e4a | 506 | EXPORT_SYMBOL(cfg80211_find_ie_match); |
2a519311 | 507 | |
9e9ea439 | 508 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, int oui_type, |
0c28ec58 EP |
509 | const u8 *ies, int len) |
510 | { | |
fbd05e4a LC |
511 | const u8 *ie; |
512 | u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; | |
513 | int match_len = (oui_type < 0) ? 3 : sizeof(match); | |
0c28ec58 | 514 | |
9e9ea439 EG |
515 | if (WARN_ON(oui_type > 0xff)) |
516 | return NULL; | |
517 | ||
fbd05e4a LC |
518 | ie = cfg80211_find_ie_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, |
519 | match, match_len, 2); | |
6719429d | 520 | |
fbd05e4a LC |
521 | if (ie && (ie[1] < 4)) |
522 | return NULL; | |
6719429d | 523 | |
fbd05e4a | 524 | return ie; |
0c28ec58 EP |
525 | } |
526 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
527 | ||
915de2ff | 528 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
2a519311 JB |
529 | const u8 *ssid, size_t ssid_len) |
530 | { | |
9caf0364 | 531 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
532 | const u8 *ssidie; |
533 | ||
ac422d3c | 534 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
535 | return false; |
536 | ||
79420f09 JB |
537 | if (!ssid) |
538 | return true; | |
539 | ||
9caf0364 JB |
540 | ies = rcu_access_pointer(a->ies); |
541 | if (!ies) | |
542 | return false; | |
543 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
2a519311 JB |
544 | if (!ssidie) |
545 | return false; | |
546 | if (ssidie[1] != ssid_len) | |
547 | return false; | |
548 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
549 | } | |
550 | ||
4593c4cb JB |
551 | /** |
552 | * enum bss_compare_mode - BSS compare mode | |
553 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
554 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
555 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
556 | */ | |
557 | enum bss_compare_mode { | |
558 | BSS_CMP_REGULAR, | |
559 | BSS_CMP_HIDE_ZLEN, | |
560 | BSS_CMP_HIDE_NUL, | |
561 | }; | |
562 | ||
dd9dfb9f | 563 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 564 | struct cfg80211_bss *b, |
4593c4cb | 565 | enum bss_compare_mode mode) |
dd9dfb9f | 566 | { |
9caf0364 | 567 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
568 | const u8 *ie1 = NULL; |
569 | const u8 *ie2 = NULL; | |
5622f5bb | 570 | int i, r; |
dd9dfb9f | 571 | |
3af6341c JB |
572 | if (a->channel != b->channel) |
573 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 574 | |
9caf0364 JB |
575 | a_ies = rcu_access_pointer(a->ies); |
576 | if (!a_ies) | |
577 | return -1; | |
578 | b_ies = rcu_access_pointer(b->ies); | |
579 | if (!b_ies) | |
580 | return 1; | |
581 | ||
3af6341c JB |
582 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
583 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
584 | a_ies->data, a_ies->len); | |
585 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
586 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
587 | b_ies->data, b_ies->len); | |
588 | if (ie1 && ie2) { | |
589 | int mesh_id_cmp; | |
590 | ||
591 | if (ie1[1] == ie2[1]) | |
592 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
593 | else | |
594 | mesh_id_cmp = ie2[1] - ie1[1]; | |
595 | ||
596 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
597 | a_ies->data, a_ies->len); | |
598 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
599 | b_ies->data, b_ies->len); | |
600 | if (ie1 && ie2) { | |
601 | if (mesh_id_cmp) | |
602 | return mesh_id_cmp; | |
603 | if (ie1[1] != ie2[1]) | |
604 | return ie2[1] - ie1[1]; | |
605 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
606 | } | |
607 | } | |
608 | ||
3af6341c JB |
609 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
610 | if (r) | |
611 | return r; | |
612 | ||
9caf0364 JB |
613 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
614 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 615 | |
5622f5bb JB |
616 | if (!ie1 && !ie2) |
617 | return 0; | |
618 | ||
f94f8b16 | 619 | /* |
5622f5bb JB |
620 | * Note that with "hide_ssid", the function returns a match if |
621 | * the already-present BSS ("b") is a hidden SSID beacon for | |
622 | * the new BSS ("a"). | |
f94f8b16 | 623 | */ |
dd9dfb9f DT |
624 | |
625 | /* sort missing IE before (left of) present IE */ | |
626 | if (!ie1) | |
627 | return -1; | |
628 | if (!ie2) | |
629 | return 1; | |
630 | ||
4593c4cb JB |
631 | switch (mode) { |
632 | case BSS_CMP_HIDE_ZLEN: | |
633 | /* | |
634 | * In ZLEN mode we assume the BSS entry we're | |
635 | * looking for has a zero-length SSID. So if | |
636 | * the one we're looking at right now has that, | |
637 | * return 0. Otherwise, return the difference | |
638 | * in length, but since we're looking for the | |
639 | * 0-length it's really equivalent to returning | |
640 | * the length of the one we're looking at. | |
641 | * | |
642 | * No content comparison is needed as we assume | |
643 | * the content length is zero. | |
644 | */ | |
645 | return ie2[1]; | |
646 | case BSS_CMP_REGULAR: | |
647 | default: | |
648 | /* sort by length first, then by contents */ | |
649 | if (ie1[1] != ie2[1]) | |
650 | return ie2[1] - ie1[1]; | |
5622f5bb | 651 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
652 | case BSS_CMP_HIDE_NUL: |
653 | if (ie1[1] != ie2[1]) | |
654 | return ie2[1] - ie1[1]; | |
655 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
656 | for (i = 0; i < ie2[1]; i++) | |
657 | if (ie2[i + 2]) | |
658 | return -1; | |
659 | return 0; | |
660 | } | |
dd9dfb9f DT |
661 | } |
662 | ||
6eb18137 | 663 | static bool cfg80211_bss_type_match(u16 capability, |
57fbcce3 | 664 | enum nl80211_band band, |
6eb18137 DL |
665 | enum ieee80211_bss_type bss_type) |
666 | { | |
667 | bool ret = true; | |
668 | u16 mask, val; | |
669 | ||
670 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
671 | return ret; | |
672 | ||
57fbcce3 | 673 | if (band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
674 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
675 | switch (bss_type) { | |
676 | case IEEE80211_BSS_TYPE_ESS: | |
677 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
678 | break; | |
679 | case IEEE80211_BSS_TYPE_PBSS: | |
680 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
681 | break; | |
682 | case IEEE80211_BSS_TYPE_IBSS: | |
683 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
684 | break; | |
685 | default: | |
686 | return false; | |
687 | } | |
688 | } else { | |
689 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
690 | switch (bss_type) { | |
691 | case IEEE80211_BSS_TYPE_ESS: | |
692 | val = WLAN_CAPABILITY_ESS; | |
693 | break; | |
694 | case IEEE80211_BSS_TYPE_IBSS: | |
695 | val = WLAN_CAPABILITY_IBSS; | |
696 | break; | |
697 | case IEEE80211_BSS_TYPE_MBSS: | |
698 | val = 0; | |
699 | break; | |
700 | default: | |
701 | return false; | |
702 | } | |
703 | } | |
704 | ||
705 | ret = ((capability & mask) == val); | |
706 | return ret; | |
707 | } | |
708 | ||
0e3a39b5 | 709 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 JB |
710 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
711 | struct ieee80211_channel *channel, | |
712 | const u8 *bssid, | |
79420f09 | 713 | const u8 *ssid, size_t ssid_len, |
6eb18137 DL |
714 | enum ieee80211_bss_type bss_type, |
715 | enum ieee80211_privacy privacy) | |
2a519311 | 716 | { |
f26cbf40 | 717 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 718 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 719 | unsigned long now = jiffies; |
6eb18137 | 720 | int bss_privacy; |
2a519311 | 721 | |
6eb18137 DL |
722 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
723 | privacy); | |
4ee3e063 | 724 | |
1b8ec87a | 725 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 726 | |
1b8ec87a | 727 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
728 | if (!cfg80211_bss_type_match(bss->pub.capability, |
729 | bss->pub.channel->band, bss_type)) | |
730 | continue; | |
731 | ||
732 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
733 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
734 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 735 | continue; |
2a519311 JB |
736 | if (channel && bss->pub.channel != channel) |
737 | continue; | |
c14a7400 JB |
738 | if (!is_valid_ether_addr(bss->pub.bssid)) |
739 | continue; | |
ccb6c136 JB |
740 | /* Don't get expired BSS structs */ |
741 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
742 | !atomic_read(&bss->hold)) | |
743 | continue; | |
2a519311 JB |
744 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
745 | res = bss; | |
1b8ec87a | 746 | bss_ref_get(rdev, res); |
2a519311 JB |
747 | break; |
748 | } | |
749 | } | |
750 | ||
1b8ec87a | 751 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
752 | if (!res) |
753 | return NULL; | |
4ee3e063 | 754 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
755 | return &res->pub; |
756 | } | |
757 | EXPORT_SYMBOL(cfg80211_get_bss); | |
758 | ||
1b8ec87a | 759 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
760 | struct cfg80211_internal_bss *bss) |
761 | { | |
1b8ec87a | 762 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
763 | struct rb_node *parent = NULL; |
764 | struct cfg80211_internal_bss *tbss; | |
765 | int cmp; | |
766 | ||
767 | while (*p) { | |
768 | parent = *p; | |
769 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
770 | ||
4593c4cb | 771 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
772 | |
773 | if (WARN_ON(!cmp)) { | |
774 | /* will sort of leak this BSS */ | |
775 | return; | |
776 | } | |
777 | ||
778 | if (cmp < 0) | |
779 | p = &(*p)->rb_left; | |
780 | else | |
781 | p = &(*p)->rb_right; | |
782 | } | |
783 | ||
784 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 785 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
786 | } |
787 | ||
788 | static struct cfg80211_internal_bss * | |
1b8ec87a | 789 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 790 | struct cfg80211_internal_bss *res, |
4593c4cb | 791 | enum bss_compare_mode mode) |
dd9dfb9f | 792 | { |
1b8ec87a | 793 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
794 | struct cfg80211_internal_bss *bss; |
795 | int r; | |
796 | ||
797 | while (n) { | |
798 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 799 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
800 | |
801 | if (r == 0) | |
802 | return bss; | |
803 | else if (r < 0) | |
804 | n = n->rb_left; | |
805 | else | |
806 | n = n->rb_right; | |
807 | } | |
808 | ||
809 | return NULL; | |
810 | } | |
811 | ||
1b8ec87a | 812 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 813 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 814 | { |
9caf0364 | 815 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
816 | struct cfg80211_internal_bss *bss; |
817 | const u8 *ie; | |
818 | int i, ssidlen; | |
819 | u8 fold = 0; | |
9853a55e | 820 | u32 n_entries = 0; |
9caf0364 | 821 | |
776b3580 | 822 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 823 | if (WARN_ON(!ies)) |
776b3580 | 824 | return false; |
dd9dfb9f | 825 | |
776b3580 JB |
826 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
827 | if (!ie) { | |
828 | /* nothing to do */ | |
829 | return true; | |
830 | } | |
831 | ||
832 | ssidlen = ie[1]; | |
833 | for (i = 0; i < ssidlen; i++) | |
834 | fold |= ie[2 + i]; | |
835 | ||
836 | if (fold) { | |
837 | /* not a hidden SSID */ | |
838 | return true; | |
839 | } | |
840 | ||
841 | /* This is the bad part ... */ | |
842 | ||
1b8ec87a | 843 | list_for_each_entry(bss, &rdev->bss_list, list) { |
9853a55e JB |
844 | /* |
845 | * we're iterating all the entries anyway, so take the | |
846 | * opportunity to validate the list length accounting | |
847 | */ | |
848 | n_entries++; | |
849 | ||
776b3580 JB |
850 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
851 | continue; | |
852 | if (bss->pub.channel != new->pub.channel) | |
853 | continue; | |
dcd6eac1 SW |
854 | if (bss->pub.scan_width != new->pub.scan_width) |
855 | continue; | |
776b3580 JB |
856 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
857 | continue; | |
858 | ies = rcu_access_pointer(bss->pub.ies); | |
859 | if (!ies) | |
860 | continue; | |
861 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
862 | if (!ie) | |
863 | continue; | |
864 | if (ssidlen && ie[1] != ssidlen) | |
865 | continue; | |
776b3580 JB |
866 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
867 | continue; | |
868 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
869 | list_del(&bss->hidden_list); | |
870 | /* combine them */ | |
871 | list_add(&bss->hidden_list, &new->hidden_list); | |
872 | bss->pub.hidden_beacon_bss = &new->pub; | |
873 | new->refcount += bss->refcount; | |
874 | rcu_assign_pointer(bss->pub.beacon_ies, | |
875 | new->pub.beacon_ies); | |
876 | } | |
877 | ||
9853a55e JB |
878 | WARN_ONCE(n_entries != rdev->bss_entries, |
879 | "rdev bss entries[%d]/list[len:%d] corruption\n", | |
880 | rdev->bss_entries, n_entries); | |
881 | ||
776b3580 | 882 | return true; |
dd9dfb9f DT |
883 | } |
884 | ||
0e3a39b5 | 885 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 | 886 | static struct cfg80211_internal_bss * |
1b8ec87a | 887 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
3afc2167 EG |
888 | struct cfg80211_internal_bss *tmp, |
889 | bool signal_valid) | |
2a519311 JB |
890 | { |
891 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 892 | |
9caf0364 | 893 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 894 | return NULL; |
2a519311 | 895 | |
9caf0364 | 896 | tmp->ts = jiffies; |
2a519311 | 897 | |
1b8ec87a | 898 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 899 | |
9caf0364 | 900 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
1b8ec87a | 901 | spin_unlock_bh(&rdev->bss_lock); |
9caf0364 JB |
902 | return NULL; |
903 | } | |
904 | ||
1b8ec87a | 905 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 906 | |
cd1658f5 | 907 | if (found) { |
34a6eddb | 908 | /* Update IEs */ |
9caf0364 JB |
909 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
910 | const struct cfg80211_bss_ies *old; | |
911 | ||
912 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 913 | |
9caf0364 JB |
914 | rcu_assign_pointer(found->pub.proberesp_ies, |
915 | tmp->pub.proberesp_ies); | |
34a6eddb | 916 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
917 | rcu_assign_pointer(found->pub.ies, |
918 | tmp->pub.proberesp_ies); | |
919 | if (old) | |
920 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
921 | rcu_head); | |
922 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
9537f227 | 923 | const struct cfg80211_bss_ies *old; |
776b3580 JB |
924 | struct cfg80211_internal_bss *bss; |
925 | ||
926 | if (found->pub.hidden_beacon_bss && | |
927 | !list_empty(&found->hidden_list)) { | |
1345ee6a JB |
928 | const struct cfg80211_bss_ies *f; |
929 | ||
776b3580 JB |
930 | /* |
931 | * The found BSS struct is one of the probe | |
932 | * response members of a group, but we're | |
933 | * receiving a beacon (beacon_ies in the tmp | |
934 | * bss is used). This can only mean that the | |
935 | * AP changed its beacon from not having an | |
936 | * SSID to showing it, which is confusing so | |
937 | * drop this information. | |
938 | */ | |
1345ee6a JB |
939 | |
940 | f = rcu_access_pointer(tmp->pub.beacon_ies); | |
941 | kfree_rcu((struct cfg80211_bss_ies *)f, | |
942 | rcu_head); | |
776b3580 JB |
943 | goto drop; |
944 | } | |
915de2ff | 945 | |
9caf0364 | 946 | old = rcu_access_pointer(found->pub.beacon_ies); |
9caf0364 JB |
947 | |
948 | rcu_assign_pointer(found->pub.beacon_ies, | |
949 | tmp->pub.beacon_ies); | |
01123e23 SN |
950 | |
951 | /* Override IEs if they were from a beacon before */ | |
9537f227 | 952 | if (old == rcu_access_pointer(found->pub.ies)) |
9caf0364 JB |
953 | rcu_assign_pointer(found->pub.ies, |
954 | tmp->pub.beacon_ies); | |
cd1658f5 | 955 | |
776b3580 JB |
956 | /* Assign beacon IEs to all sub entries */ |
957 | list_for_each_entry(bss, &found->hidden_list, | |
958 | hidden_list) { | |
959 | const struct cfg80211_bss_ies *ies; | |
960 | ||
961 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
962 | WARN_ON(ies != old); | |
963 | ||
964 | rcu_assign_pointer(bss->pub.beacon_ies, | |
965 | tmp->pub.beacon_ies); | |
966 | } | |
967 | ||
9caf0364 JB |
968 | if (old) |
969 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
970 | rcu_head); | |
971 | } | |
1345ee6a JB |
972 | |
973 | found->pub.beacon_interval = tmp->pub.beacon_interval; | |
3afc2167 EG |
974 | /* |
975 | * don't update the signal if beacon was heard on | |
976 | * adjacent channel. | |
977 | */ | |
978 | if (signal_valid) | |
979 | found->pub.signal = tmp->pub.signal; | |
1345ee6a JB |
980 | found->pub.capability = tmp->pub.capability; |
981 | found->ts = tmp->ts; | |
6e19bc4b | 982 | found->ts_boottime = tmp->ts_boottime; |
1d76250b AS |
983 | found->parent_tsf = tmp->parent_tsf; |
984 | ether_addr_copy(found->parent_bssid, tmp->parent_bssid); | |
2a519311 | 985 | } else { |
9caf0364 | 986 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 987 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 988 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 989 | |
9caf0364 JB |
990 | /* |
991 | * create a copy -- the "res" variable that is passed in | |
992 | * is allocated on the stack since it's not needed in the | |
993 | * more common case of an update | |
994 | */ | |
1b8ec87a | 995 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
996 | GFP_ATOMIC); |
997 | if (!new) { | |
998 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
999 | if (ies) | |
1000 | kfree_rcu(ies, rcu_head); | |
1001 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
1002 | if (ies) | |
1003 | kfree_rcu(ies, rcu_head); | |
776b3580 | 1004 | goto drop; |
9caf0364 JB |
1005 | } |
1006 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
1007 | new->refcount = 1; |
1008 | INIT_LIST_HEAD(&new->hidden_list); | |
1009 | ||
1010 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 1011 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 1012 | if (!hidden) |
1b8ec87a | 1013 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
1014 | BSS_CMP_HIDE_NUL); |
1015 | if (hidden) { | |
1016 | new->pub.hidden_beacon_bss = &hidden->pub; | |
1017 | list_add(&new->hidden_list, | |
1018 | &hidden->hidden_list); | |
1019 | hidden->refcount++; | |
1020 | rcu_assign_pointer(new->pub.beacon_ies, | |
1021 | hidden->pub.beacon_ies); | |
1022 | } | |
1023 | } else { | |
1024 | /* | |
1025 | * Ok so we found a beacon, and don't have an entry. If | |
1026 | * it's a beacon with hidden SSID, we might be in for an | |
1027 | * expensive search for any probe responses that should | |
1028 | * be grouped with this beacon for updates ... | |
1029 | */ | |
1b8ec87a | 1030 | if (!cfg80211_combine_bsses(rdev, new)) { |
776b3580 JB |
1031 | kfree(new); |
1032 | goto drop; | |
1033 | } | |
1034 | } | |
1035 | ||
9853a55e JB |
1036 | if (rdev->bss_entries >= bss_entries_limit && |
1037 | !cfg80211_bss_expire_oldest(rdev)) { | |
1038 | kfree(new); | |
1039 | goto drop; | |
1040 | } | |
1041 | ||
1b8ec87a | 1042 | list_add_tail(&new->list, &rdev->bss_list); |
9853a55e | 1043 | rdev->bss_entries++; |
1b8ec87a | 1044 | rb_insert_bss(rdev, new); |
9caf0364 | 1045 | found = new; |
2a519311 JB |
1046 | } |
1047 | ||
1b8ec87a ZG |
1048 | rdev->bss_generation++; |
1049 | bss_ref_get(rdev, found); | |
1050 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 | 1051 | |
2a519311 | 1052 | return found; |
776b3580 | 1053 | drop: |
1b8ec87a | 1054 | spin_unlock_bh(&rdev->bss_lock); |
776b3580 | 1055 | return NULL; |
2a519311 JB |
1056 | } |
1057 | ||
0172bb75 JB |
1058 | static struct ieee80211_channel * |
1059 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
1060 | struct ieee80211_channel *channel) | |
1061 | { | |
1062 | const u8 *tmp; | |
1063 | u32 freq; | |
1064 | int channel_number = -1; | |
1065 | ||
1066 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
1067 | if (tmp && tmp[1] == 1) { | |
1068 | channel_number = tmp[2]; | |
1069 | } else { | |
1070 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
1071 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
1072 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
1073 | ||
1074 | channel_number = htop->primary_chan; | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | if (channel_number < 0) | |
1079 | return channel; | |
1080 | ||
1081 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
1082 | channel = ieee80211_get_channel(wiphy, freq); | |
1083 | if (!channel) | |
1084 | return NULL; | |
1085 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
1086 | return NULL; | |
1087 | return channel; | |
1088 | } | |
1089 | ||
0e3a39b5 | 1090 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
6e19bc4b DS |
1091 | struct cfg80211_bss * |
1092 | cfg80211_inform_bss_data(struct wiphy *wiphy, | |
1093 | struct cfg80211_inform_bss *data, | |
1094 | enum cfg80211_bss_frame_type ftype, | |
1095 | const u8 *bssid, u64 tsf, u16 capability, | |
1096 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
1097 | gfp_t gfp) | |
06aa7afa | 1098 | { |
9caf0364 | 1099 | struct cfg80211_bss_ies *ies; |
3afc2167 | 1100 | struct ieee80211_channel *channel; |
9caf0364 | 1101 | struct cfg80211_internal_bss tmp = {}, *res; |
6eb18137 | 1102 | int bss_type; |
67af9811 | 1103 | bool signal_valid; |
06aa7afa JK |
1104 | |
1105 | if (WARN_ON(!wiphy)) | |
1106 | return NULL; | |
1107 | ||
22fe88d3 | 1108 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1109 | (data->signal < 0 || data->signal > 100))) |
06aa7afa JK |
1110 | return NULL; |
1111 | ||
6e19bc4b | 1112 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan); |
0172bb75 JB |
1113 | if (!channel) |
1114 | return NULL; | |
1115 | ||
9caf0364 JB |
1116 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
1117 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1118 | tmp.pub.scan_width = data->scan_width; |
1119 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1120 | tmp.pub.beacon_interval = beacon_interval; |
1121 | tmp.pub.capability = capability; | |
6e19bc4b DS |
1122 | tmp.ts_boottime = data->boottime_ns; |
1123 | ||
34a6eddb | 1124 | /* |
5bc8c1f2 | 1125 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
1126 | * Response frame, we need to pick one of the options and only use it |
1127 | * with the driver that does not provide the full Beacon/Probe Response | |
1128 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 1129 | * override the IEs pointer should we have received an earlier |
9caf0364 | 1130 | * indication of Probe Response data. |
34a6eddb | 1131 | */ |
0e227084 | 1132 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 JB |
1133 | if (!ies) |
1134 | return NULL; | |
1135 | ies->len = ielen; | |
8cef2c9d | 1136 | ies->tsf = tsf; |
0e227084 | 1137 | ies->from_beacon = false; |
9caf0364 | 1138 | memcpy(ies->data, ie, ielen); |
06aa7afa | 1139 | |
5bc8c1f2 JB |
1140 | switch (ftype) { |
1141 | case CFG80211_BSS_FTYPE_BEACON: | |
1142 | ies->from_beacon = true; | |
1143 | /* fall through to assign */ | |
1144 | case CFG80211_BSS_FTYPE_UNKNOWN: | |
1145 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1146 | break; | |
1147 | case CFG80211_BSS_FTYPE_PRESP: | |
1148 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1149 | break; | |
1150 | } | |
9caf0364 | 1151 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 1152 | |
6e19bc4b | 1153 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1154 | wiphy->max_adj_channel_rssi_comp; |
1155 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
06aa7afa JK |
1156 | if (!res) |
1157 | return NULL; | |
1158 | ||
57fbcce3 | 1159 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1160 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1161 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1162 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1163 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1164 | } else { | |
1165 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1166 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1167 | } | |
06aa7afa | 1168 | |
4ee3e063 | 1169 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
1170 | /* cfg80211_bss_update gives us a referenced result */ |
1171 | return &res->pub; | |
1172 | } | |
6e19bc4b | 1173 | EXPORT_SYMBOL(cfg80211_inform_bss_data); |
06aa7afa | 1174 | |
6e19bc4b | 1175 | /* cfg80211_inform_bss_width_frame helper */ |
2a519311 | 1176 | struct cfg80211_bss * |
6e19bc4b DS |
1177 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, |
1178 | struct cfg80211_inform_bss *data, | |
1179 | struct ieee80211_mgmt *mgmt, size_t len, | |
1180 | gfp_t gfp) | |
1181 | ||
2a519311 | 1182 | { |
9caf0364 JB |
1183 | struct cfg80211_internal_bss tmp = {}, *res; |
1184 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 1185 | struct ieee80211_channel *channel; |
67af9811 | 1186 | bool signal_valid; |
2a519311 JB |
1187 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
1188 | u.probe_resp.variable); | |
6eb18137 | 1189 | int bss_type; |
bef9bacc | 1190 | |
0172bb75 JB |
1191 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
1192 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
1193 | ||
6e19bc4b | 1194 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
4ee3e063 | 1195 | |
bef9bacc MK |
1196 | if (WARN_ON(!mgmt)) |
1197 | return NULL; | |
1198 | ||
1199 | if (WARN_ON(!wiphy)) | |
1200 | return NULL; | |
2a519311 | 1201 | |
22fe88d3 | 1202 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1203 | (data->signal < 0 || data->signal > 100))) |
2a519311 JB |
1204 | return NULL; |
1205 | ||
bef9bacc | 1206 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
1207 | return NULL; |
1208 | ||
0172bb75 | 1209 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
6e19bc4b | 1210 | ielen, data->chan); |
0172bb75 JB |
1211 | if (!channel) |
1212 | return NULL; | |
1213 | ||
0e227084 | 1214 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 1215 | if (!ies) |
2a519311 | 1216 | return NULL; |
9caf0364 | 1217 | ies->len = ielen; |
8cef2c9d | 1218 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
0e227084 | 1219 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); |
9caf0364 | 1220 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
2a519311 | 1221 | |
9caf0364 JB |
1222 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
1223 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1224 | else | |
1225 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1226 | rcu_assign_pointer(tmp.pub.ies, ies); | |
505a2e88 | 1227 | |
9caf0364 JB |
1228 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); |
1229 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1230 | tmp.pub.scan_width = data->scan_width; |
1231 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1232 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
1233 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
6e19bc4b | 1234 | tmp.ts_boottime = data->boottime_ns; |
1d76250b AS |
1235 | tmp.parent_tsf = data->parent_tsf; |
1236 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); | |
9caf0364 | 1237 | |
6e19bc4b | 1238 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1239 | wiphy->max_adj_channel_rssi_comp; |
1240 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
2a519311 JB |
1241 | if (!res) |
1242 | return NULL; | |
1243 | ||
57fbcce3 | 1244 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1245 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1246 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1247 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1248 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1249 | } else { | |
1250 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1251 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1252 | } | |
e38f8a7a | 1253 | |
4ee3e063 | 1254 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1255 | /* cfg80211_bss_update gives us a referenced result */ |
1256 | return &res->pub; | |
1257 | } | |
6e19bc4b | 1258 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 1259 | |
5b112d3d | 1260 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 1261 | { |
f26cbf40 | 1262 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
1263 | struct cfg80211_internal_bss *bss; |
1264 | ||
1265 | if (!pub) | |
1266 | return; | |
1267 | ||
1268 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1269 | |
1b8ec87a ZG |
1270 | spin_lock_bh(&rdev->bss_lock); |
1271 | bss_ref_get(rdev, bss); | |
1272 | spin_unlock_bh(&rdev->bss_lock); | |
4c0c0b75 JB |
1273 | } |
1274 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
1275 | ||
5b112d3d | 1276 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 1277 | { |
f26cbf40 | 1278 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
1279 | struct cfg80211_internal_bss *bss; |
1280 | ||
1281 | if (!pub) | |
1282 | return; | |
1283 | ||
1284 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1285 | |
1b8ec87a ZG |
1286 | spin_lock_bh(&rdev->bss_lock); |
1287 | bss_ref_put(rdev, bss); | |
1288 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 JB |
1289 | } |
1290 | EXPORT_SYMBOL(cfg80211_put_bss); | |
1291 | ||
d491af19 JB |
1292 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1293 | { | |
f26cbf40 | 1294 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
d491af19 JB |
1295 | struct cfg80211_internal_bss *bss; |
1296 | ||
1297 | if (WARN_ON(!pub)) | |
1298 | return; | |
1299 | ||
1300 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
1301 | ||
1b8ec87a | 1302 | spin_lock_bh(&rdev->bss_lock); |
3207390a | 1303 | if (!list_empty(&bss->list)) { |
1b8ec87a ZG |
1304 | if (__cfg80211_unlink_bss(rdev, bss)) |
1305 | rdev->bss_generation++; | |
3207390a | 1306 | } |
1b8ec87a | 1307 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
1308 | } |
1309 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
1310 | ||
3d23e349 | 1311 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
1312 | static struct cfg80211_registered_device * |
1313 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
1314 | { | |
5fe231e8 | 1315 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
1316 | struct net_device *dev; |
1317 | ||
5fe231e8 JB |
1318 | ASSERT_RTNL(); |
1319 | ||
9f419f38 JB |
1320 | dev = dev_get_by_index(net, ifindex); |
1321 | if (!dev) | |
5fe231e8 JB |
1322 | return ERR_PTR(-ENODEV); |
1323 | if (dev->ieee80211_ptr) | |
f26cbf40 | 1324 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 1325 | else |
9f419f38 JB |
1326 | rdev = ERR_PTR(-ENODEV); |
1327 | dev_put(dev); | |
9f419f38 JB |
1328 | return rdev; |
1329 | } | |
1330 | ||
2a519311 JB |
1331 | int cfg80211_wext_siwscan(struct net_device *dev, |
1332 | struct iw_request_info *info, | |
1333 | union iwreq_data *wrqu, char *extra) | |
1334 | { | |
1335 | struct cfg80211_registered_device *rdev; | |
1336 | struct wiphy *wiphy; | |
1337 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 1338 | struct cfg80211_scan_request *creq = NULL; |
2a519311 | 1339 | int i, err, n_channels = 0; |
57fbcce3 | 1340 | enum nl80211_band band; |
2a519311 JB |
1341 | |
1342 | if (!netif_running(dev)) | |
1343 | return -ENETDOWN; | |
1344 | ||
b2e3abdc HS |
1345 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
1346 | wreq = (struct iw_scan_req *)extra; | |
1347 | ||
463d0183 | 1348 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1349 | |
1350 | if (IS_ERR(rdev)) | |
1351 | return PTR_ERR(rdev); | |
1352 | ||
f9d15d16 | 1353 | if (rdev->scan_req || rdev->scan_msg) { |
2a519311 JB |
1354 | err = -EBUSY; |
1355 | goto out; | |
1356 | } | |
1357 | ||
1358 | wiphy = &rdev->wiphy; | |
1359 | ||
b2e3abdc HS |
1360 | /* Determine number of channels, needed to allocate creq */ |
1361 | if (wreq && wreq->num_channels) | |
1362 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
1363 | else |
1364 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
1365 | |
1366 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1367 | n_channels * sizeof(void *), | |
1368 | GFP_ATOMIC); | |
1369 | if (!creq) { | |
1370 | err = -ENOMEM; | |
1371 | goto out; | |
1372 | } | |
1373 | ||
1374 | creq->wiphy = wiphy; | |
fd014284 | 1375 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1376 | /* SSIDs come after channels */ |
1377 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1378 | creq->n_channels = n_channels; |
1379 | creq->n_ssids = 1; | |
15d6030b | 1380 | creq->scan_start = jiffies; |
2a519311 | 1381 | |
b2e3abdc | 1382 | /* translate "Scan on frequencies" request */ |
2a519311 | 1383 | i = 0; |
57fbcce3 | 1384 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
2a519311 | 1385 | int j; |
584991dc | 1386 | |
2a519311 JB |
1387 | if (!wiphy->bands[band]) |
1388 | continue; | |
584991dc | 1389 | |
2a519311 | 1390 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1391 | /* ignore disabled channels */ |
1392 | if (wiphy->bands[band]->channels[j].flags & | |
1393 | IEEE80211_CHAN_DISABLED) | |
1394 | continue; | |
b2e3abdc HS |
1395 | |
1396 | /* If we have a wireless request structure and the | |
1397 | * wireless request specifies frequencies, then search | |
1398 | * for the matching hardware channel. | |
1399 | */ | |
1400 | if (wreq && wreq->num_channels) { | |
1401 | int k; | |
1402 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1403 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
1404 | struct iw_freq *freq = |
1405 | &wreq->channel_list[k]; | |
1406 | int wext_freq = | |
1407 | cfg80211_wext_freq(freq); | |
1408 | ||
b2e3abdc HS |
1409 | if (wext_freq == wiphy_freq) |
1410 | goto wext_freq_found; | |
1411 | } | |
1412 | goto wext_freq_not_found; | |
1413 | } | |
1414 | ||
1415 | wext_freq_found: | |
2a519311 JB |
1416 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1417 | i++; | |
b2e3abdc | 1418 | wext_freq_not_found: ; |
2a519311 JB |
1419 | } |
1420 | } | |
8862dc5f HS |
1421 | /* No channels found? */ |
1422 | if (!i) { | |
1423 | err = -EINVAL; | |
1424 | goto out; | |
1425 | } | |
2a519311 | 1426 | |
b2e3abdc HS |
1427 | /* Set real number of channels specified in creq->channels[] */ |
1428 | creq->n_channels = i; | |
2a519311 | 1429 | |
b2e3abdc HS |
1430 | /* translate "Scan for SSID" request */ |
1431 | if (wreq) { | |
2a519311 | 1432 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1433 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1434 | err = -EINVAL; | |
1435 | goto out; | |
1436 | } | |
2a519311 JB |
1437 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1438 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1439 | } | |
1440 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1441 | creq->n_ssids = 0; | |
1442 | } | |
1443 | ||
57fbcce3 | 1444 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
a401d2bb JB |
1445 | if (wiphy->bands[i]) |
1446 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1447 | |
818965d3 JM |
1448 | eth_broadcast_addr(creq->bssid); |
1449 | ||
2a519311 | 1450 | rdev->scan_req = creq; |
e35e4d28 | 1451 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1452 | if (err) { |
1453 | rdev->scan_req = NULL; | |
65486c8b | 1454 | /* creq will be freed below */ |
463d0183 | 1455 | } else { |
fd014284 | 1456 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1457 | /* creq now owned by driver */ |
1458 | creq = NULL; | |
463d0183 JB |
1459 | dev_hold(dev); |
1460 | } | |
2a519311 | 1461 | out: |
65486c8b | 1462 | kfree(creq); |
2a519311 JB |
1463 | return err; |
1464 | } | |
2afe38d1 | 1465 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 1466 | |
76a70e9c JM |
1467 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
1468 | const struct cfg80211_bss_ies *ies, | |
1469 | char *current_ev, char *end_buf) | |
2a519311 | 1470 | { |
9caf0364 | 1471 | const u8 *pos, *end, *next; |
2a519311 JB |
1472 | struct iw_event iwe; |
1473 | ||
9caf0364 | 1474 | if (!ies) |
76a70e9c | 1475 | return current_ev; |
2a519311 JB |
1476 | |
1477 | /* | |
1478 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1479 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1480 | */ | |
9caf0364 JB |
1481 | pos = ies->data; |
1482 | end = pos + ies->len; | |
2a519311 JB |
1483 | |
1484 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1485 | next = pos + 2 + pos[1]; | |
1486 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1487 | next = next + 2 + next[1]; | |
1488 | ||
1489 | memset(&iwe, 0, sizeof(iwe)); | |
1490 | iwe.cmd = IWEVGENIE; | |
1491 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
1492 | current_ev = iwe_stream_add_point_check(info, current_ev, |
1493 | end_buf, &iwe, | |
1494 | (void *)pos); | |
1495 | if (IS_ERR(current_ev)) | |
1496 | return current_ev; | |
2a519311 JB |
1497 | pos = next; |
1498 | } | |
1499 | ||
1500 | if (end > pos) { | |
1501 | memset(&iwe, 0, sizeof(iwe)); | |
1502 | iwe.cmd = IWEVGENIE; | |
1503 | iwe.u.data.length = end - pos; | |
76a70e9c JM |
1504 | current_ev = iwe_stream_add_point_check(info, current_ev, |
1505 | end_buf, &iwe, | |
1506 | (void *)pos); | |
1507 | if (IS_ERR(current_ev)) | |
1508 | return current_ev; | |
2a519311 | 1509 | } |
76a70e9c JM |
1510 | |
1511 | return current_ev; | |
2a519311 JB |
1512 | } |
1513 | ||
2a519311 | 1514 | static char * |
77965c97 JB |
1515 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1516 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1517 | char *end_buf) | |
2a519311 | 1518 | { |
9caf0364 | 1519 | const struct cfg80211_bss_ies *ies; |
2a519311 | 1520 | struct iw_event iwe; |
9caf0364 | 1521 | const u8 *ie; |
76a70e9c JM |
1522 | u8 buf[50]; |
1523 | u8 *cfg, *p, *tmp; | |
9caf0364 | 1524 | int rem, i, sig; |
2a519311 JB |
1525 | bool ismesh = false; |
1526 | ||
1527 | memset(&iwe, 0, sizeof(iwe)); | |
1528 | iwe.cmd = SIOCGIWAP; | |
1529 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1530 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
1531 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1532 | IW_EV_ADDR_LEN); | |
1533 | if (IS_ERR(current_ev)) | |
1534 | return current_ev; | |
2a519311 JB |
1535 | |
1536 | memset(&iwe, 0, sizeof(iwe)); | |
1537 | iwe.cmd = SIOCGIWFREQ; | |
1538 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1539 | iwe.u.freq.e = 0; | |
76a70e9c JM |
1540 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1541 | IW_EV_FREQ_LEN); | |
1542 | if (IS_ERR(current_ev)) | |
1543 | return current_ev; | |
2a519311 JB |
1544 | |
1545 | memset(&iwe, 0, sizeof(iwe)); | |
1546 | iwe.cmd = SIOCGIWFREQ; | |
1547 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1548 | iwe.u.freq.e = 6; | |
76a70e9c JM |
1549 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1550 | IW_EV_FREQ_LEN); | |
1551 | if (IS_ERR(current_ev)) | |
1552 | return current_ev; | |
2a519311 | 1553 | |
77965c97 | 1554 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1555 | memset(&iwe, 0, sizeof(iwe)); |
1556 | iwe.cmd = IWEVQUAL; | |
1557 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1558 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1559 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1560 | switch (wiphy->signal_type) { |
2a519311 | 1561 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1562 | sig = bss->pub.signal / 100; |
1563 | iwe.u.qual.level = sig; | |
2a519311 | 1564 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1565 | if (sig < -110) /* rather bad */ |
1566 | sig = -110; | |
1567 | else if (sig > -40) /* perfect */ | |
1568 | sig = -40; | |
1569 | /* will give a range of 0 .. 70 */ | |
1570 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1571 | break; |
1572 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1573 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1574 | /* will give range 0 .. 100 */ |
1575 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1576 | break; |
1577 | default: | |
1578 | /* not reached */ | |
1579 | break; | |
1580 | } | |
76a70e9c JM |
1581 | current_ev = iwe_stream_add_event_check(info, current_ev, |
1582 | end_buf, &iwe, | |
1583 | IW_EV_QUAL_LEN); | |
1584 | if (IS_ERR(current_ev)) | |
1585 | return current_ev; | |
2a519311 JB |
1586 | } |
1587 | ||
1588 | memset(&iwe, 0, sizeof(iwe)); | |
1589 | iwe.cmd = SIOCGIWENCODE; | |
1590 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1591 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1592 | else | |
1593 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1594 | iwe.u.data.length = 0; | |
76a70e9c JM |
1595 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
1596 | &iwe, ""); | |
1597 | if (IS_ERR(current_ev)) | |
1598 | return current_ev; | |
2a519311 | 1599 | |
9caf0364 JB |
1600 | rcu_read_lock(); |
1601 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
1602 | rem = ies->len; |
1603 | ie = ies->data; | |
9caf0364 | 1604 | |
83c7aa1a | 1605 | while (rem >= 2) { |
2a519311 JB |
1606 | /* invalid data */ |
1607 | if (ie[1] > rem - 2) | |
1608 | break; | |
1609 | ||
1610 | switch (ie[0]) { | |
1611 | case WLAN_EID_SSID: | |
1612 | memset(&iwe, 0, sizeof(iwe)); | |
1613 | iwe.cmd = SIOCGIWESSID; | |
1614 | iwe.u.data.length = ie[1]; | |
1615 | iwe.u.data.flags = 1; | |
76a70e9c JM |
1616 | current_ev = iwe_stream_add_point_check(info, |
1617 | current_ev, | |
1618 | end_buf, &iwe, | |
1619 | (u8 *)ie + 2); | |
1620 | if (IS_ERR(current_ev)) | |
1621 | goto unlock; | |
2a519311 JB |
1622 | break; |
1623 | case WLAN_EID_MESH_ID: | |
1624 | memset(&iwe, 0, sizeof(iwe)); | |
1625 | iwe.cmd = SIOCGIWESSID; | |
1626 | iwe.u.data.length = ie[1]; | |
1627 | iwe.u.data.flags = 1; | |
76a70e9c JM |
1628 | current_ev = iwe_stream_add_point_check(info, |
1629 | current_ev, | |
1630 | end_buf, &iwe, | |
1631 | (u8 *)ie + 2); | |
1632 | if (IS_ERR(current_ev)) | |
1633 | goto unlock; | |
2a519311 JB |
1634 | break; |
1635 | case WLAN_EID_MESH_CONFIG: | |
1636 | ismesh = true; | |
136cfa28 | 1637 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 1638 | break; |
9caf0364 | 1639 | cfg = (u8 *)ie + 2; |
2a519311 JB |
1640 | memset(&iwe, 0, sizeof(iwe)); |
1641 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1642 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1643 | "0x%02X", cfg[0]); | |
2a519311 | 1644 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1645 | current_ev = iwe_stream_add_point_check(info, |
1646 | current_ev, | |
1647 | end_buf, | |
1648 | &iwe, buf); | |
1649 | if (IS_ERR(current_ev)) | |
1650 | goto unlock; | |
76aa5e70 RP |
1651 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1652 | cfg[1]); | |
2a519311 | 1653 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1654 | current_ev = iwe_stream_add_point_check(info, |
1655 | current_ev, | |
1656 | end_buf, | |
1657 | &iwe, buf); | |
1658 | if (IS_ERR(current_ev)) | |
1659 | goto unlock; | |
76aa5e70 RP |
1660 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1661 | cfg[2]); | |
2a519311 | 1662 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1663 | current_ev = iwe_stream_add_point_check(info, |
1664 | current_ev, | |
1665 | end_buf, | |
1666 | &iwe, buf); | |
1667 | if (IS_ERR(current_ev)) | |
1668 | goto unlock; | |
76aa5e70 | 1669 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 | 1670 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1671 | current_ev = iwe_stream_add_point_check(info, |
1672 | current_ev, | |
1673 | end_buf, | |
1674 | &iwe, buf); | |
1675 | if (IS_ERR(current_ev)) | |
1676 | goto unlock; | |
76aa5e70 RP |
1677 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1678 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
1679 | current_ev = iwe_stream_add_point_check(info, |
1680 | current_ev, | |
1681 | end_buf, | |
1682 | &iwe, buf); | |
1683 | if (IS_ERR(current_ev)) | |
1684 | goto unlock; | |
76aa5e70 RP |
1685 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
1686 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
1687 | current_ev = iwe_stream_add_point_check(info, |
1688 | current_ev, | |
1689 | end_buf, | |
1690 | &iwe, buf); | |
1691 | if (IS_ERR(current_ev)) | |
1692 | goto unlock; | |
76aa5e70 | 1693 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
2a519311 | 1694 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1695 | current_ev = iwe_stream_add_point_check(info, |
1696 | current_ev, | |
1697 | end_buf, | |
1698 | &iwe, buf); | |
1699 | if (IS_ERR(current_ev)) | |
1700 | goto unlock; | |
2a519311 JB |
1701 | break; |
1702 | case WLAN_EID_SUPP_RATES: | |
1703 | case WLAN_EID_EXT_SUPP_RATES: | |
1704 | /* display all supported rates in readable format */ | |
1705 | p = current_ev + iwe_stream_lcp_len(info); | |
1706 | ||
1707 | memset(&iwe, 0, sizeof(iwe)); | |
1708 | iwe.cmd = SIOCGIWRATE; | |
1709 | /* Those two flags are ignored... */ | |
1710 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1711 | ||
1712 | for (i = 0; i < ie[1]; i++) { | |
1713 | iwe.u.bitrate.value = | |
1714 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 1715 | tmp = p; |
2a519311 | 1716 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
1717 | end_buf, &iwe, |
1718 | IW_EV_PARAM_LEN); | |
1719 | if (p == tmp) { | |
1720 | current_ev = ERR_PTR(-E2BIG); | |
1721 | goto unlock; | |
1722 | } | |
2a519311 JB |
1723 | } |
1724 | current_ev = p; | |
1725 | break; | |
1726 | } | |
1727 | rem -= ie[1] + 2; | |
1728 | ie += ie[1] + 2; | |
1729 | } | |
1730 | ||
f64f9e71 JP |
1731 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1732 | ismesh) { | |
2a519311 JB |
1733 | memset(&iwe, 0, sizeof(iwe)); |
1734 | iwe.cmd = SIOCGIWMODE; | |
1735 | if (ismesh) | |
1736 | iwe.u.mode = IW_MODE_MESH; | |
1737 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1738 | iwe.u.mode = IW_MODE_MASTER; | |
1739 | else | |
1740 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
1741 | current_ev = iwe_stream_add_event_check(info, current_ev, |
1742 | end_buf, &iwe, | |
1743 | IW_EV_UINT_LEN); | |
1744 | if (IS_ERR(current_ev)) | |
1745 | goto unlock; | |
2a519311 JB |
1746 | } |
1747 | ||
76a70e9c JM |
1748 | memset(&iwe, 0, sizeof(iwe)); |
1749 | iwe.cmd = IWEVCUSTOM; | |
1750 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); | |
1751 | iwe.u.data.length = strlen(buf); | |
1752 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, | |
1753 | &iwe, buf); | |
1754 | if (IS_ERR(current_ev)) | |
1755 | goto unlock; | |
1756 | memset(&iwe, 0, sizeof(iwe)); | |
1757 | iwe.cmd = IWEVCUSTOM; | |
1758 | sprintf(buf, " Last beacon: %ums ago", | |
1759 | elapsed_jiffies_msecs(bss->ts)); | |
1760 | iwe.u.data.length = strlen(buf); | |
1761 | current_ev = iwe_stream_add_point_check(info, current_ev, | |
1762 | end_buf, &iwe, buf); | |
1763 | if (IS_ERR(current_ev)) | |
1764 | goto unlock; | |
1765 | ||
1766 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
1767 | ||
1768 | unlock: | |
9caf0364 | 1769 | rcu_read_unlock(); |
2a519311 JB |
1770 | return current_ev; |
1771 | } | |
1772 | ||
1773 | ||
1b8ec87a | 1774 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
1775 | struct iw_request_info *info, |
1776 | char *buf, size_t len) | |
1777 | { | |
1778 | char *current_ev = buf; | |
1779 | char *end_buf = buf + len; | |
1780 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 1781 | int err = 0; |
2a519311 | 1782 | |
1b8ec87a ZG |
1783 | spin_lock_bh(&rdev->bss_lock); |
1784 | cfg80211_bss_expire(rdev); | |
2a519311 | 1785 | |
1b8ec87a | 1786 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 1787 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
1788 | err = -E2BIG; |
1789 | break; | |
2a519311 | 1790 | } |
1b8ec87a | 1791 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 1792 | current_ev, end_buf); |
76a70e9c JM |
1793 | if (IS_ERR(current_ev)) { |
1794 | err = PTR_ERR(current_ev); | |
1795 | break; | |
1796 | } | |
2a519311 | 1797 | } |
1b8ec87a | 1798 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
1799 | |
1800 | if (err) | |
1801 | return err; | |
2a519311 JB |
1802 | return current_ev - buf; |
1803 | } | |
1804 | ||
1805 | ||
1806 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1807 | struct iw_request_info *info, | |
1808 | struct iw_point *data, char *extra) | |
1809 | { | |
1810 | struct cfg80211_registered_device *rdev; | |
1811 | int res; | |
1812 | ||
1813 | if (!netif_running(dev)) | |
1814 | return -ENETDOWN; | |
1815 | ||
463d0183 | 1816 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1817 | |
1818 | if (IS_ERR(rdev)) | |
1819 | return PTR_ERR(rdev); | |
1820 | ||
f9d15d16 | 1821 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 1822 | return -EAGAIN; |
2a519311 JB |
1823 | |
1824 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1825 | data->length = 0; | |
1826 | if (res >= 0) { | |
1827 | data->length = res; | |
1828 | res = 0; | |
1829 | } | |
1830 | ||
2a519311 JB |
1831 | return res; |
1832 | } | |
2afe38d1 | 1833 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 1834 | #endif |