]>
Commit | Line | Data |
---|---|---|
2a519311 JB |
1 | /* |
2 | * cfg80211 scan result handling | |
3 | * | |
4 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> | |
2740f0cf | 5 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
1d76250b | 6 | * Copyright 2016 Intel Deutschland GmbH |
2a519311 JB |
7 | */ |
8 | #include <linux/kernel.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
2a519311 JB |
10 | #include <linux/module.h> |
11 | #include <linux/netdevice.h> | |
12 | #include <linux/wireless.h> | |
13 | #include <linux/nl80211.h> | |
14 | #include <linux/etherdevice.h> | |
15 | #include <net/arp.h> | |
16 | #include <net/cfg80211.h> | |
262eb9b2 | 17 | #include <net/cfg80211-wext.h> |
2a519311 JB |
18 | #include <net/iw_handler.h> |
19 | #include "core.h" | |
20 | #include "nl80211.h" | |
a9a11622 | 21 | #include "wext-compat.h" |
e35e4d28 | 22 | #include "rdev-ops.h" |
2a519311 | 23 | |
776b3580 JB |
24 | /** |
25 | * DOC: BSS tree/list structure | |
26 | * | |
27 | * At the top level, the BSS list is kept in both a list in each | |
28 | * registered device (@bss_list) as well as an RB-tree for faster | |
29 | * lookup. In the RB-tree, entries can be looked up using their | |
30 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID | |
31 | * for other BSSes. | |
32 | * | |
33 | * Due to the possibility of hidden SSIDs, there's a second level | |
34 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. | |
35 | * The hidden_list connects all BSSes belonging to a single AP | |
36 | * that has a hidden SSID, and connects beacon and probe response | |
37 | * entries. For a probe response entry for a hidden SSID, the | |
38 | * hidden_beacon_bss pointer points to the BSS struct holding the | |
39 | * beacon's information. | |
40 | * | |
41 | * Reference counting is done for all these references except for | |
42 | * the hidden_list, so that a beacon BSS struct that is otherwise | |
43 | * not referenced has one reference for being on the bss_list and | |
44 | * one for each probe response entry that points to it using the | |
45 | * hidden_beacon_bss pointer. When a BSS struct that has such a | |
46 | * pointer is get/put, the refcount update is also propagated to | |
47 | * the referenced struct, this ensure that it cannot get removed | |
48 | * while somebody is using the probe response version. | |
49 | * | |
50 | * Note that the hidden_beacon_bss pointer never changes, due to | |
51 | * the reference counting. Therefore, no locking is needed for | |
52 | * it. | |
53 | * | |
54 | * Also note that the hidden_beacon_bss pointer is only relevant | |
55 | * if the driver uses something other than the IEs, e.g. private | |
56 | * data stored stored in the BSS struct, since the beacon IEs are | |
57 | * also linked into the probe response struct. | |
58 | */ | |
59 | ||
9853a55e JB |
60 | /* |
61 | * Limit the number of BSS entries stored in mac80211. Each one is | |
62 | * a bit over 4k at most, so this limits to roughly 4-5M of memory. | |
63 | * If somebody wants to really attack this though, they'd likely | |
64 | * use small beacons, and only one type of frame, limiting each of | |
65 | * the entries to a much smaller size (in order to generate more | |
66 | * entries in total, so overhead is bigger.) | |
67 | */ | |
68 | static int bss_entries_limit = 1000; | |
69 | module_param(bss_entries_limit, int, 0644); | |
70 | MODULE_PARM_DESC(bss_entries_limit, | |
71 | "limit to number of scan BSS entries (per wiphy, default 1000)"); | |
72 | ||
f9616e0f | 73 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 74 | |
776b3580 | 75 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 76 | { |
9caf0364 | 77 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
78 | |
79 | if (WARN_ON(atomic_read(&bss->hold))) | |
80 | return; | |
81 | ||
9caf0364 | 82 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 83 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
84 | kfree_rcu(ies, rcu_head); |
85 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
86 | if (ies) | |
87 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 88 | |
776b3580 JB |
89 | /* |
90 | * This happens when the module is removed, it doesn't | |
91 | * really matter any more save for completeness | |
92 | */ | |
93 | if (!list_empty(&bss->hidden_list)) | |
94 | list_del(&bss->hidden_list); | |
95 | ||
e8e27c66 AK |
96 | kfree(bss); |
97 | } | |
98 | ||
1b8ec87a | 99 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
776b3580 | 100 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 101 | { |
1b8ec87a | 102 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
103 | |
104 | bss->refcount++; | |
105 | if (bss->pub.hidden_beacon_bss) { | |
106 | bss = container_of(bss->pub.hidden_beacon_bss, | |
107 | struct cfg80211_internal_bss, | |
108 | pub); | |
109 | bss->refcount++; | |
110 | } | |
0532d4f1 JB |
111 | } |
112 | ||
1b8ec87a | 113 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
776b3580 | 114 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 115 | { |
1b8ec87a | 116 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
117 | |
118 | if (bss->pub.hidden_beacon_bss) { | |
119 | struct cfg80211_internal_bss *hbss; | |
120 | hbss = container_of(bss->pub.hidden_beacon_bss, | |
121 | struct cfg80211_internal_bss, | |
122 | pub); | |
123 | hbss->refcount--; | |
124 | if (hbss->refcount == 0) | |
125 | bss_free(hbss); | |
126 | } | |
127 | bss->refcount--; | |
128 | if (bss->refcount == 0) | |
129 | bss_free(bss); | |
0532d4f1 JB |
130 | } |
131 | ||
1b8ec87a | 132 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
133 | struct cfg80211_internal_bss *bss) |
134 | { | |
1b8ec87a | 135 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 136 | |
776b3580 JB |
137 | if (!list_empty(&bss->hidden_list)) { |
138 | /* | |
139 | * don't remove the beacon entry if it has | |
140 | * probe responses associated with it | |
141 | */ | |
142 | if (!bss->pub.hidden_beacon_bss) | |
143 | return false; | |
144 | /* | |
145 | * if it's a probe response entry break its | |
146 | * link to the other entries in the group | |
147 | */ | |
148 | list_del_init(&bss->hidden_list); | |
149 | } | |
150 | ||
e8e27c66 | 151 | list_del_init(&bss->list); |
1b8ec87a | 152 | rb_erase(&bss->rbn, &rdev->bss_tree); |
9853a55e JB |
153 | rdev->bss_entries--; |
154 | WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list), | |
155 | "rdev bss entries[%d]/list[empty:%d] corruption\n", | |
156 | rdev->bss_entries, list_empty(&rdev->bss_list)); | |
1b8ec87a | 157 | bss_ref_put(rdev, bss); |
776b3580 | 158 | return true; |
e8e27c66 AK |
159 | } |
160 | ||
1b8ec87a | 161 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
162 | unsigned long expire_time) |
163 | { | |
164 | struct cfg80211_internal_bss *bss, *tmp; | |
165 | bool expired = false; | |
166 | ||
1b8ec87a | 167 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 168 | |
1b8ec87a | 169 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
170 | if (atomic_read(&bss->hold)) |
171 | continue; | |
172 | if (!time_after(expire_time, bss->ts)) | |
173 | continue; | |
174 | ||
1b8ec87a | 175 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 176 | expired = true; |
15d6030b SL |
177 | } |
178 | ||
179 | if (expired) | |
1b8ec87a | 180 | rdev->bss_generation++; |
15d6030b SL |
181 | } |
182 | ||
9853a55e JB |
183 | static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) |
184 | { | |
185 | struct cfg80211_internal_bss *bss, *oldest = NULL; | |
186 | bool ret; | |
187 | ||
188 | lockdep_assert_held(&rdev->bss_lock); | |
189 | ||
190 | list_for_each_entry(bss, &rdev->bss_list, list) { | |
191 | if (atomic_read(&bss->hold)) | |
192 | continue; | |
193 | ||
194 | if (!list_empty(&bss->hidden_list) && | |
195 | !bss->pub.hidden_beacon_bss) | |
196 | continue; | |
197 | ||
198 | if (oldest && time_before(oldest->ts, bss->ts)) | |
199 | continue; | |
200 | oldest = bss; | |
201 | } | |
202 | ||
203 | if (WARN_ON(!oldest)) | |
204 | return false; | |
205 | ||
206 | /* | |
207 | * The callers make sure to increase rdev->bss_generation if anything | |
208 | * gets removed (and a new entry added), so there's no need to also do | |
209 | * it here. | |
210 | */ | |
211 | ||
212 | ret = __cfg80211_unlink_bss(rdev, oldest); | |
213 | WARN_ON(!ret); | |
214 | return ret; | |
215 | } | |
216 | ||
f9d15d16 JB |
217 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
218 | bool send_message) | |
2a519311 | 219 | { |
667503dd | 220 | struct cfg80211_scan_request *request; |
fd014284 | 221 | struct wireless_dev *wdev; |
f9d15d16 | 222 | struct sk_buff *msg; |
3d23e349 | 223 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
224 | union iwreq_data wrqu; |
225 | #endif | |
226 | ||
5fe231e8 | 227 | ASSERT_RTNL(); |
01a0ac41 | 228 | |
f9d15d16 | 229 | if (rdev->scan_msg) { |
505a2e88 | 230 | nl80211_send_scan_msg(rdev, rdev->scan_msg); |
f9d15d16 JB |
231 | rdev->scan_msg = NULL; |
232 | return; | |
233 | } | |
667503dd | 234 | |
f9d15d16 | 235 | request = rdev->scan_req; |
01a0ac41 JB |
236 | if (!request) |
237 | return; | |
238 | ||
fd014284 | 239 | wdev = request->wdev; |
2a519311 | 240 | |
6829c878 JB |
241 | /* |
242 | * This must be before sending the other events! | |
243 | * Otherwise, wpa_supplicant gets completely confused with | |
244 | * wext events. | |
245 | */ | |
fd014284 JB |
246 | if (wdev->netdev) |
247 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 248 | |
1d76250b | 249 | if (!request->info.aborted && |
f9d15d16 JB |
250 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
251 | /* flush entries from previous scans */ | |
252 | spin_lock_bh(&rdev->bss_lock); | |
253 | __cfg80211_bss_expire(rdev, request->scan_start); | |
254 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 255 | } |
2a519311 | 256 | |
1d76250b | 257 | msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); |
f9d15d16 | 258 | |
3d23e349 | 259 | #ifdef CONFIG_CFG80211_WEXT |
1d76250b | 260 | if (wdev->netdev && !request->info.aborted) { |
2a519311 JB |
261 | memset(&wrqu, 0, sizeof(wrqu)); |
262 | ||
fd014284 | 263 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
264 | } |
265 | #endif | |
266 | ||
fd014284 JB |
267 | if (wdev->netdev) |
268 | dev_put(wdev->netdev); | |
2a519311 | 269 | |
36e6fea8 | 270 | rdev->scan_req = NULL; |
4a58e7c3 | 271 | kfree(request); |
f9d15d16 JB |
272 | |
273 | if (!send_message) | |
274 | rdev->scan_msg = msg; | |
275 | else | |
505a2e88 | 276 | nl80211_send_scan_msg(rdev, msg); |
2a519311 | 277 | } |
667503dd | 278 | |
36e6fea8 JB |
279 | void __cfg80211_scan_done(struct work_struct *wk) |
280 | { | |
281 | struct cfg80211_registered_device *rdev; | |
282 | ||
283 | rdev = container_of(wk, struct cfg80211_registered_device, | |
284 | scan_done_wk); | |
285 | ||
5fe231e8 | 286 | rtnl_lock(); |
f9d15d16 | 287 | ___cfg80211_scan_done(rdev, true); |
5fe231e8 | 288 | rtnl_unlock(); |
36e6fea8 JB |
289 | } |
290 | ||
1d76250b AS |
291 | void cfg80211_scan_done(struct cfg80211_scan_request *request, |
292 | struct cfg80211_scan_info *info) | |
667503dd | 293 | { |
1d76250b | 294 | trace_cfg80211_scan_done(request, info); |
f26cbf40 | 295 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req); |
667503dd | 296 | |
1d76250b | 297 | request->info = *info; |
5fe231e8 | 298 | request->notified = true; |
f26cbf40 | 299 | queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); |
667503dd | 300 | } |
2a519311 JB |
301 | EXPORT_SYMBOL(cfg80211_scan_done); |
302 | ||
ca986ad9 AVS |
303 | void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev, |
304 | struct cfg80211_sched_scan_request *req) | |
305 | { | |
306 | ASSERT_RTNL(); | |
307 | ||
308 | list_add_rcu(&req->list, &rdev->sched_scan_req_list); | |
309 | } | |
310 | ||
311 | static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev, | |
312 | struct cfg80211_sched_scan_request *req) | |
313 | { | |
314 | ASSERT_RTNL(); | |
315 | ||
316 | list_del_rcu(&req->list); | |
317 | kfree_rcu(req, rcu_head); | |
318 | } | |
319 | ||
320 | static struct cfg80211_sched_scan_request * | |
321 | cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid) | |
322 | { | |
323 | struct cfg80211_sched_scan_request *pos; | |
324 | ||
1b57b621 | 325 | WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); |
ca986ad9 | 326 | |
1b57b621 | 327 | list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list) { |
ca986ad9 AVS |
328 | if (pos->reqid == reqid) |
329 | return pos; | |
330 | } | |
b34939b9 | 331 | return NULL; |
ca986ad9 AVS |
332 | } |
333 | ||
334 | /* | |
335 | * Determines if a scheduled scan request can be handled. When a legacy | |
336 | * scheduled scan is running no other scheduled scan is allowed regardless | |
337 | * whether the request is for legacy or multi-support scan. When a multi-support | |
338 | * scheduled scan is running a request for legacy scan is not allowed. In this | |
339 | * case a request for multi-support scan can be handled if resources are | |
340 | * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached. | |
341 | */ | |
342 | int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev, | |
343 | bool want_multi) | |
344 | { | |
345 | struct cfg80211_sched_scan_request *pos; | |
346 | int i = 0; | |
347 | ||
348 | list_for_each_entry(pos, &rdev->sched_scan_req_list, list) { | |
349 | /* request id zero means legacy in progress */ | |
350 | if (!i && !pos->reqid) | |
351 | return -EINPROGRESS; | |
352 | i++; | |
353 | } | |
354 | ||
355 | if (i) { | |
356 | /* no legacy allowed when multi request(s) are active */ | |
357 | if (!want_multi) | |
358 | return -EINPROGRESS; | |
359 | ||
360 | /* resource limit reached */ | |
361 | if (i == rdev->wiphy.max_sched_scan_reqs) | |
362 | return -ENOSPC; | |
363 | } | |
364 | return 0; | |
365 | } | |
366 | ||
b34939b9 | 367 | void cfg80211_sched_scan_results_wk(struct work_struct *work) |
807f8a8c LC |
368 | { |
369 | struct cfg80211_registered_device *rdev; | |
b34939b9 | 370 | struct cfg80211_sched_scan_request *req, *tmp; |
807f8a8c | 371 | |
b34939b9 AVS |
372 | rdev = container_of(work, struct cfg80211_registered_device, |
373 | sched_scan_res_wk); | |
807f8a8c | 374 | |
5fe231e8 | 375 | rtnl_lock(); |
b34939b9 AVS |
376 | list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { |
377 | if (req->report_results) { | |
378 | req->report_results = false; | |
379 | if (req->flags & NL80211_SCAN_FLAG_FLUSH) { | |
380 | /* flush entries from previous scans */ | |
381 | spin_lock_bh(&rdev->bss_lock); | |
382 | __cfg80211_bss_expire(rdev, req->scan_start); | |
383 | spin_unlock_bh(&rdev->bss_lock); | |
384 | req->scan_start = jiffies; | |
385 | } | |
386 | nl80211_send_sched_scan(req, | |
387 | NL80211_CMD_SCHED_SCAN_RESULTS); | |
15d6030b | 388 | } |
15d6030b | 389 | } |
5fe231e8 | 390 | rtnl_unlock(); |
807f8a8c LC |
391 | } |
392 | ||
b34939b9 | 393 | void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 394 | { |
ca986ad9 AVS |
395 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
396 | struct cfg80211_sched_scan_request *request; | |
397 | ||
b34939b9 | 398 | trace_cfg80211_sched_scan_results(wiphy, reqid); |
807f8a8c | 399 | /* ignore if we're not scanning */ |
31a60ed1 | 400 | |
1b57b621 | 401 | rcu_read_lock(); |
b34939b9 AVS |
402 | request = cfg80211_find_sched_scan_req(rdev, reqid); |
403 | if (request) { | |
404 | request->report_results = true; | |
405 | queue_work(cfg80211_wq, &rdev->sched_scan_res_wk); | |
406 | } | |
1b57b621 | 407 | rcu_read_unlock(); |
807f8a8c LC |
408 | } |
409 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
410 | ||
b34939b9 | 411 | void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid) |
807f8a8c | 412 | { |
f26cbf40 | 413 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 414 | |
792e6aa7 EP |
415 | ASSERT_RTNL(); |
416 | ||
b34939b9 | 417 | trace_cfg80211_sched_scan_stopped(wiphy, reqid); |
4ee3e063 | 418 | |
b34939b9 | 419 | __cfg80211_stop_sched_scan(rdev, reqid, true); |
792e6aa7 EP |
420 | } |
421 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl); | |
422 | ||
b34939b9 | 423 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid) |
792e6aa7 EP |
424 | { |
425 | rtnl_lock(); | |
b34939b9 | 426 | cfg80211_sched_scan_stopped_rtnl(wiphy, reqid); |
5fe231e8 | 427 | rtnl_unlock(); |
807f8a8c | 428 | } |
807f8a8c LC |
429 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
430 | ||
ca986ad9 AVS |
431 | int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev, |
432 | struct cfg80211_sched_scan_request *req, | |
433 | bool driver_initiated) | |
807f8a8c | 434 | { |
5fe231e8 | 435 | ASSERT_RTNL(); |
807f8a8c | 436 | |
85a9994a | 437 | if (!driver_initiated) { |
3a3ecf1d | 438 | int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid); |
85a9994a LC |
439 | if (err) |
440 | return err; | |
441 | } | |
807f8a8c | 442 | |
ca986ad9 | 443 | nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED); |
807f8a8c | 444 | |
ca986ad9 | 445 | cfg80211_del_sched_scan_req(rdev, req); |
807f8a8c | 446 | |
3b4670ff | 447 | return 0; |
807f8a8c LC |
448 | } |
449 | ||
ca986ad9 AVS |
450 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, |
451 | u64 reqid, bool driver_initiated) | |
452 | { | |
453 | struct cfg80211_sched_scan_request *sched_scan_req; | |
454 | ||
455 | ASSERT_RTNL(); | |
456 | ||
457 | sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid); | |
b34939b9 AVS |
458 | if (!sched_scan_req) |
459 | return -ENOENT; | |
ca986ad9 AVS |
460 | |
461 | return cfg80211_stop_sched_scan_req(rdev, sched_scan_req, | |
462 | driver_initiated); | |
463 | } | |
464 | ||
1b8ec87a | 465 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
466 | unsigned long age_secs) |
467 | { | |
468 | struct cfg80211_internal_bss *bss; | |
469 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
470 | ||
1b8ec87a ZG |
471 | spin_lock_bh(&rdev->bss_lock); |
472 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 473 | bss->ts -= age_jiffies; |
1b8ec87a | 474 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
475 | } |
476 | ||
1b8ec87a | 477 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 478 | { |
1b8ec87a | 479 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
480 | } |
481 | ||
fbd05e4a LC |
482 | const u8 *cfg80211_find_ie_match(u8 eid, const u8 *ies, int len, |
483 | const u8 *match, int match_len, | |
484 | int match_offset) | |
2a519311 | 485 | { |
fbd05e4a LC |
486 | /* match_offset can't be smaller than 2, unless match_len is |
487 | * zero, in which case match_offset must be zero as well. | |
488 | */ | |
489 | if (WARN_ON((match_len && match_offset < 2) || | |
490 | (!match_len && match_offset))) | |
491 | return NULL; | |
492 | ||
493 | while (len >= 2 && len >= ies[1] + 2) { | |
494 | if ((ies[0] == eid) && | |
495 | (ies[1] + 2 >= match_offset + match_len) && | |
496 | !memcmp(ies + match_offset, match, match_len)) | |
497 | return ies; | |
498 | ||
2a519311 JB |
499 | len -= ies[1] + 2; |
500 | ies += ies[1] + 2; | |
501 | } | |
fbd05e4a LC |
502 | |
503 | return NULL; | |
2a519311 | 504 | } |
fbd05e4a | 505 | EXPORT_SYMBOL(cfg80211_find_ie_match); |
2a519311 | 506 | |
9e9ea439 | 507 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, int oui_type, |
0c28ec58 EP |
508 | const u8 *ies, int len) |
509 | { | |
fbd05e4a LC |
510 | const u8 *ie; |
511 | u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; | |
512 | int match_len = (oui_type < 0) ? 3 : sizeof(match); | |
0c28ec58 | 513 | |
9e9ea439 EG |
514 | if (WARN_ON(oui_type > 0xff)) |
515 | return NULL; | |
516 | ||
fbd05e4a LC |
517 | ie = cfg80211_find_ie_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, |
518 | match, match_len, 2); | |
6719429d | 519 | |
fbd05e4a LC |
520 | if (ie && (ie[1] < 4)) |
521 | return NULL; | |
6719429d | 522 | |
fbd05e4a | 523 | return ie; |
0c28ec58 EP |
524 | } |
525 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
526 | ||
915de2ff | 527 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
2a519311 JB |
528 | const u8 *ssid, size_t ssid_len) |
529 | { | |
9caf0364 | 530 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
531 | const u8 *ssidie; |
532 | ||
ac422d3c | 533 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
534 | return false; |
535 | ||
79420f09 JB |
536 | if (!ssid) |
537 | return true; | |
538 | ||
9caf0364 JB |
539 | ies = rcu_access_pointer(a->ies); |
540 | if (!ies) | |
541 | return false; | |
542 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
2a519311 JB |
543 | if (!ssidie) |
544 | return false; | |
545 | if (ssidie[1] != ssid_len) | |
546 | return false; | |
547 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
548 | } | |
549 | ||
4593c4cb JB |
550 | /** |
551 | * enum bss_compare_mode - BSS compare mode | |
552 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
553 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
554 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
555 | */ | |
556 | enum bss_compare_mode { | |
557 | BSS_CMP_REGULAR, | |
558 | BSS_CMP_HIDE_ZLEN, | |
559 | BSS_CMP_HIDE_NUL, | |
560 | }; | |
561 | ||
dd9dfb9f | 562 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 563 | struct cfg80211_bss *b, |
4593c4cb | 564 | enum bss_compare_mode mode) |
dd9dfb9f | 565 | { |
9caf0364 | 566 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
567 | const u8 *ie1 = NULL; |
568 | const u8 *ie2 = NULL; | |
5622f5bb | 569 | int i, r; |
dd9dfb9f | 570 | |
3af6341c JB |
571 | if (a->channel != b->channel) |
572 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 573 | |
9caf0364 JB |
574 | a_ies = rcu_access_pointer(a->ies); |
575 | if (!a_ies) | |
576 | return -1; | |
577 | b_ies = rcu_access_pointer(b->ies); | |
578 | if (!b_ies) | |
579 | return 1; | |
580 | ||
3af6341c JB |
581 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
582 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
583 | a_ies->data, a_ies->len); | |
584 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
585 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
586 | b_ies->data, b_ies->len); | |
587 | if (ie1 && ie2) { | |
588 | int mesh_id_cmp; | |
589 | ||
590 | if (ie1[1] == ie2[1]) | |
591 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
592 | else | |
593 | mesh_id_cmp = ie2[1] - ie1[1]; | |
594 | ||
595 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
596 | a_ies->data, a_ies->len); | |
597 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
598 | b_ies->data, b_ies->len); | |
599 | if (ie1 && ie2) { | |
600 | if (mesh_id_cmp) | |
601 | return mesh_id_cmp; | |
602 | if (ie1[1] != ie2[1]) | |
603 | return ie2[1] - ie1[1]; | |
604 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
605 | } | |
606 | } | |
607 | ||
3af6341c JB |
608 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
609 | if (r) | |
610 | return r; | |
611 | ||
9caf0364 JB |
612 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
613 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 614 | |
5622f5bb JB |
615 | if (!ie1 && !ie2) |
616 | return 0; | |
617 | ||
f94f8b16 | 618 | /* |
5622f5bb JB |
619 | * Note that with "hide_ssid", the function returns a match if |
620 | * the already-present BSS ("b") is a hidden SSID beacon for | |
621 | * the new BSS ("a"). | |
f94f8b16 | 622 | */ |
dd9dfb9f DT |
623 | |
624 | /* sort missing IE before (left of) present IE */ | |
625 | if (!ie1) | |
626 | return -1; | |
627 | if (!ie2) | |
628 | return 1; | |
629 | ||
4593c4cb JB |
630 | switch (mode) { |
631 | case BSS_CMP_HIDE_ZLEN: | |
632 | /* | |
633 | * In ZLEN mode we assume the BSS entry we're | |
634 | * looking for has a zero-length SSID. So if | |
635 | * the one we're looking at right now has that, | |
636 | * return 0. Otherwise, return the difference | |
637 | * in length, but since we're looking for the | |
638 | * 0-length it's really equivalent to returning | |
639 | * the length of the one we're looking at. | |
640 | * | |
641 | * No content comparison is needed as we assume | |
642 | * the content length is zero. | |
643 | */ | |
644 | return ie2[1]; | |
645 | case BSS_CMP_REGULAR: | |
646 | default: | |
647 | /* sort by length first, then by contents */ | |
648 | if (ie1[1] != ie2[1]) | |
649 | return ie2[1] - ie1[1]; | |
5622f5bb | 650 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
651 | case BSS_CMP_HIDE_NUL: |
652 | if (ie1[1] != ie2[1]) | |
653 | return ie2[1] - ie1[1]; | |
654 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
655 | for (i = 0; i < ie2[1]; i++) | |
656 | if (ie2[i + 2]) | |
657 | return -1; | |
658 | return 0; | |
659 | } | |
dd9dfb9f DT |
660 | } |
661 | ||
6eb18137 | 662 | static bool cfg80211_bss_type_match(u16 capability, |
57fbcce3 | 663 | enum nl80211_band band, |
6eb18137 DL |
664 | enum ieee80211_bss_type bss_type) |
665 | { | |
666 | bool ret = true; | |
667 | u16 mask, val; | |
668 | ||
669 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
670 | return ret; | |
671 | ||
57fbcce3 | 672 | if (band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
673 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
674 | switch (bss_type) { | |
675 | case IEEE80211_BSS_TYPE_ESS: | |
676 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
677 | break; | |
678 | case IEEE80211_BSS_TYPE_PBSS: | |
679 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
680 | break; | |
681 | case IEEE80211_BSS_TYPE_IBSS: | |
682 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
683 | break; | |
684 | default: | |
685 | return false; | |
686 | } | |
687 | } else { | |
688 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
689 | switch (bss_type) { | |
690 | case IEEE80211_BSS_TYPE_ESS: | |
691 | val = WLAN_CAPABILITY_ESS; | |
692 | break; | |
693 | case IEEE80211_BSS_TYPE_IBSS: | |
694 | val = WLAN_CAPABILITY_IBSS; | |
695 | break; | |
696 | case IEEE80211_BSS_TYPE_MBSS: | |
697 | val = 0; | |
698 | break; | |
699 | default: | |
700 | return false; | |
701 | } | |
702 | } | |
703 | ||
704 | ret = ((capability & mask) == val); | |
705 | return ret; | |
706 | } | |
707 | ||
0e3a39b5 | 708 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 JB |
709 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
710 | struct ieee80211_channel *channel, | |
711 | const u8 *bssid, | |
79420f09 | 712 | const u8 *ssid, size_t ssid_len, |
6eb18137 DL |
713 | enum ieee80211_bss_type bss_type, |
714 | enum ieee80211_privacy privacy) | |
2a519311 | 715 | { |
f26cbf40 | 716 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 717 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 718 | unsigned long now = jiffies; |
6eb18137 | 719 | int bss_privacy; |
2a519311 | 720 | |
6eb18137 DL |
721 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
722 | privacy); | |
4ee3e063 | 723 | |
1b8ec87a | 724 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 725 | |
1b8ec87a | 726 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
727 | if (!cfg80211_bss_type_match(bss->pub.capability, |
728 | bss->pub.channel->band, bss_type)) | |
729 | continue; | |
730 | ||
731 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
732 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
733 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 734 | continue; |
2a519311 JB |
735 | if (channel && bss->pub.channel != channel) |
736 | continue; | |
c14a7400 JB |
737 | if (!is_valid_ether_addr(bss->pub.bssid)) |
738 | continue; | |
ccb6c136 JB |
739 | /* Don't get expired BSS structs */ |
740 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
741 | !atomic_read(&bss->hold)) | |
742 | continue; | |
2a519311 JB |
743 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
744 | res = bss; | |
1b8ec87a | 745 | bss_ref_get(rdev, res); |
2a519311 JB |
746 | break; |
747 | } | |
748 | } | |
749 | ||
1b8ec87a | 750 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
751 | if (!res) |
752 | return NULL; | |
4ee3e063 | 753 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
754 | return &res->pub; |
755 | } | |
756 | EXPORT_SYMBOL(cfg80211_get_bss); | |
757 | ||
1b8ec87a | 758 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
759 | struct cfg80211_internal_bss *bss) |
760 | { | |
1b8ec87a | 761 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
762 | struct rb_node *parent = NULL; |
763 | struct cfg80211_internal_bss *tbss; | |
764 | int cmp; | |
765 | ||
766 | while (*p) { | |
767 | parent = *p; | |
768 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
769 | ||
4593c4cb | 770 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
771 | |
772 | if (WARN_ON(!cmp)) { | |
773 | /* will sort of leak this BSS */ | |
774 | return; | |
775 | } | |
776 | ||
777 | if (cmp < 0) | |
778 | p = &(*p)->rb_left; | |
779 | else | |
780 | p = &(*p)->rb_right; | |
781 | } | |
782 | ||
783 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 784 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
785 | } |
786 | ||
787 | static struct cfg80211_internal_bss * | |
1b8ec87a | 788 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 789 | struct cfg80211_internal_bss *res, |
4593c4cb | 790 | enum bss_compare_mode mode) |
dd9dfb9f | 791 | { |
1b8ec87a | 792 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
793 | struct cfg80211_internal_bss *bss; |
794 | int r; | |
795 | ||
796 | while (n) { | |
797 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 798 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
799 | |
800 | if (r == 0) | |
801 | return bss; | |
802 | else if (r < 0) | |
803 | n = n->rb_left; | |
804 | else | |
805 | n = n->rb_right; | |
806 | } | |
807 | ||
808 | return NULL; | |
809 | } | |
810 | ||
1b8ec87a | 811 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 812 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 813 | { |
9caf0364 | 814 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
815 | struct cfg80211_internal_bss *bss; |
816 | const u8 *ie; | |
817 | int i, ssidlen; | |
818 | u8 fold = 0; | |
9853a55e | 819 | u32 n_entries = 0; |
9caf0364 | 820 | |
776b3580 | 821 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 822 | if (WARN_ON(!ies)) |
776b3580 | 823 | return false; |
dd9dfb9f | 824 | |
776b3580 JB |
825 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
826 | if (!ie) { | |
827 | /* nothing to do */ | |
828 | return true; | |
829 | } | |
830 | ||
831 | ssidlen = ie[1]; | |
832 | for (i = 0; i < ssidlen; i++) | |
833 | fold |= ie[2 + i]; | |
834 | ||
835 | if (fold) { | |
836 | /* not a hidden SSID */ | |
837 | return true; | |
838 | } | |
839 | ||
840 | /* This is the bad part ... */ | |
841 | ||
1b8ec87a | 842 | list_for_each_entry(bss, &rdev->bss_list, list) { |
9853a55e JB |
843 | /* |
844 | * we're iterating all the entries anyway, so take the | |
845 | * opportunity to validate the list length accounting | |
846 | */ | |
847 | n_entries++; | |
848 | ||
776b3580 JB |
849 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
850 | continue; | |
851 | if (bss->pub.channel != new->pub.channel) | |
852 | continue; | |
dcd6eac1 SW |
853 | if (bss->pub.scan_width != new->pub.scan_width) |
854 | continue; | |
776b3580 JB |
855 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
856 | continue; | |
857 | ies = rcu_access_pointer(bss->pub.ies); | |
858 | if (!ies) | |
859 | continue; | |
860 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
861 | if (!ie) | |
862 | continue; | |
863 | if (ssidlen && ie[1] != ssidlen) | |
864 | continue; | |
776b3580 JB |
865 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
866 | continue; | |
867 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
868 | list_del(&bss->hidden_list); | |
869 | /* combine them */ | |
870 | list_add(&bss->hidden_list, &new->hidden_list); | |
871 | bss->pub.hidden_beacon_bss = &new->pub; | |
872 | new->refcount += bss->refcount; | |
873 | rcu_assign_pointer(bss->pub.beacon_ies, | |
874 | new->pub.beacon_ies); | |
875 | } | |
876 | ||
9853a55e JB |
877 | WARN_ONCE(n_entries != rdev->bss_entries, |
878 | "rdev bss entries[%d]/list[len:%d] corruption\n", | |
879 | rdev->bss_entries, n_entries); | |
880 | ||
776b3580 | 881 | return true; |
dd9dfb9f DT |
882 | } |
883 | ||
0e3a39b5 | 884 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 | 885 | static struct cfg80211_internal_bss * |
1b8ec87a | 886 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
3afc2167 EG |
887 | struct cfg80211_internal_bss *tmp, |
888 | bool signal_valid) | |
2a519311 JB |
889 | { |
890 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 891 | |
9caf0364 | 892 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 893 | return NULL; |
2a519311 | 894 | |
9caf0364 | 895 | tmp->ts = jiffies; |
2a519311 | 896 | |
1b8ec87a | 897 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 898 | |
9caf0364 | 899 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
1b8ec87a | 900 | spin_unlock_bh(&rdev->bss_lock); |
9caf0364 JB |
901 | return NULL; |
902 | } | |
903 | ||
1b8ec87a | 904 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 905 | |
cd1658f5 | 906 | if (found) { |
34a6eddb | 907 | /* Update IEs */ |
9caf0364 JB |
908 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
909 | const struct cfg80211_bss_ies *old; | |
910 | ||
911 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 912 | |
9caf0364 JB |
913 | rcu_assign_pointer(found->pub.proberesp_ies, |
914 | tmp->pub.proberesp_ies); | |
34a6eddb | 915 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
916 | rcu_assign_pointer(found->pub.ies, |
917 | tmp->pub.proberesp_ies); | |
918 | if (old) | |
919 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
920 | rcu_head); | |
921 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
9537f227 | 922 | const struct cfg80211_bss_ies *old; |
776b3580 JB |
923 | struct cfg80211_internal_bss *bss; |
924 | ||
925 | if (found->pub.hidden_beacon_bss && | |
926 | !list_empty(&found->hidden_list)) { | |
1345ee6a JB |
927 | const struct cfg80211_bss_ies *f; |
928 | ||
776b3580 JB |
929 | /* |
930 | * The found BSS struct is one of the probe | |
931 | * response members of a group, but we're | |
932 | * receiving a beacon (beacon_ies in the tmp | |
933 | * bss is used). This can only mean that the | |
934 | * AP changed its beacon from not having an | |
935 | * SSID to showing it, which is confusing so | |
936 | * drop this information. | |
937 | */ | |
1345ee6a JB |
938 | |
939 | f = rcu_access_pointer(tmp->pub.beacon_ies); | |
940 | kfree_rcu((struct cfg80211_bss_ies *)f, | |
941 | rcu_head); | |
776b3580 JB |
942 | goto drop; |
943 | } | |
915de2ff | 944 | |
9caf0364 | 945 | old = rcu_access_pointer(found->pub.beacon_ies); |
9caf0364 JB |
946 | |
947 | rcu_assign_pointer(found->pub.beacon_ies, | |
948 | tmp->pub.beacon_ies); | |
01123e23 SN |
949 | |
950 | /* Override IEs if they were from a beacon before */ | |
9537f227 | 951 | if (old == rcu_access_pointer(found->pub.ies)) |
9caf0364 JB |
952 | rcu_assign_pointer(found->pub.ies, |
953 | tmp->pub.beacon_ies); | |
cd1658f5 | 954 | |
776b3580 JB |
955 | /* Assign beacon IEs to all sub entries */ |
956 | list_for_each_entry(bss, &found->hidden_list, | |
957 | hidden_list) { | |
958 | const struct cfg80211_bss_ies *ies; | |
959 | ||
960 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
961 | WARN_ON(ies != old); | |
962 | ||
963 | rcu_assign_pointer(bss->pub.beacon_ies, | |
964 | tmp->pub.beacon_ies); | |
965 | } | |
966 | ||
9caf0364 JB |
967 | if (old) |
968 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
969 | rcu_head); | |
970 | } | |
1345ee6a JB |
971 | |
972 | found->pub.beacon_interval = tmp->pub.beacon_interval; | |
3afc2167 EG |
973 | /* |
974 | * don't update the signal if beacon was heard on | |
975 | * adjacent channel. | |
976 | */ | |
977 | if (signal_valid) | |
978 | found->pub.signal = tmp->pub.signal; | |
1345ee6a JB |
979 | found->pub.capability = tmp->pub.capability; |
980 | found->ts = tmp->ts; | |
6e19bc4b | 981 | found->ts_boottime = tmp->ts_boottime; |
1d76250b AS |
982 | found->parent_tsf = tmp->parent_tsf; |
983 | ether_addr_copy(found->parent_bssid, tmp->parent_bssid); | |
2a519311 | 984 | } else { |
9caf0364 | 985 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 986 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 987 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 988 | |
9caf0364 JB |
989 | /* |
990 | * create a copy -- the "res" variable that is passed in | |
991 | * is allocated on the stack since it's not needed in the | |
992 | * more common case of an update | |
993 | */ | |
1b8ec87a | 994 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
995 | GFP_ATOMIC); |
996 | if (!new) { | |
997 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
998 | if (ies) | |
999 | kfree_rcu(ies, rcu_head); | |
1000 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
1001 | if (ies) | |
1002 | kfree_rcu(ies, rcu_head); | |
776b3580 | 1003 | goto drop; |
9caf0364 JB |
1004 | } |
1005 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
1006 | new->refcount = 1; |
1007 | INIT_LIST_HEAD(&new->hidden_list); | |
1008 | ||
1009 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 1010 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 1011 | if (!hidden) |
1b8ec87a | 1012 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
1013 | BSS_CMP_HIDE_NUL); |
1014 | if (hidden) { | |
1015 | new->pub.hidden_beacon_bss = &hidden->pub; | |
1016 | list_add(&new->hidden_list, | |
1017 | &hidden->hidden_list); | |
1018 | hidden->refcount++; | |
1019 | rcu_assign_pointer(new->pub.beacon_ies, | |
1020 | hidden->pub.beacon_ies); | |
1021 | } | |
1022 | } else { | |
1023 | /* | |
1024 | * Ok so we found a beacon, and don't have an entry. If | |
1025 | * it's a beacon with hidden SSID, we might be in for an | |
1026 | * expensive search for any probe responses that should | |
1027 | * be grouped with this beacon for updates ... | |
1028 | */ | |
1b8ec87a | 1029 | if (!cfg80211_combine_bsses(rdev, new)) { |
776b3580 JB |
1030 | kfree(new); |
1031 | goto drop; | |
1032 | } | |
1033 | } | |
1034 | ||
9853a55e JB |
1035 | if (rdev->bss_entries >= bss_entries_limit && |
1036 | !cfg80211_bss_expire_oldest(rdev)) { | |
1037 | kfree(new); | |
1038 | goto drop; | |
1039 | } | |
1040 | ||
1b8ec87a | 1041 | list_add_tail(&new->list, &rdev->bss_list); |
9853a55e | 1042 | rdev->bss_entries++; |
1b8ec87a | 1043 | rb_insert_bss(rdev, new); |
9caf0364 | 1044 | found = new; |
2a519311 JB |
1045 | } |
1046 | ||
1b8ec87a ZG |
1047 | rdev->bss_generation++; |
1048 | bss_ref_get(rdev, found); | |
1049 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 | 1050 | |
2a519311 | 1051 | return found; |
776b3580 | 1052 | drop: |
1b8ec87a | 1053 | spin_unlock_bh(&rdev->bss_lock); |
776b3580 | 1054 | return NULL; |
2a519311 JB |
1055 | } |
1056 | ||
0172bb75 JB |
1057 | static struct ieee80211_channel * |
1058 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
1059 | struct ieee80211_channel *channel) | |
1060 | { | |
1061 | const u8 *tmp; | |
1062 | u32 freq; | |
1063 | int channel_number = -1; | |
1064 | ||
1065 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
1066 | if (tmp && tmp[1] == 1) { | |
1067 | channel_number = tmp[2]; | |
1068 | } else { | |
1069 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
1070 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
1071 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
1072 | ||
1073 | channel_number = htop->primary_chan; | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | if (channel_number < 0) | |
1078 | return channel; | |
1079 | ||
1080 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
1081 | channel = ieee80211_get_channel(wiphy, freq); | |
1082 | if (!channel) | |
1083 | return NULL; | |
1084 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
1085 | return NULL; | |
1086 | return channel; | |
1087 | } | |
1088 | ||
0e3a39b5 | 1089 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
6e19bc4b DS |
1090 | struct cfg80211_bss * |
1091 | cfg80211_inform_bss_data(struct wiphy *wiphy, | |
1092 | struct cfg80211_inform_bss *data, | |
1093 | enum cfg80211_bss_frame_type ftype, | |
1094 | const u8 *bssid, u64 tsf, u16 capability, | |
1095 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
1096 | gfp_t gfp) | |
06aa7afa | 1097 | { |
9caf0364 | 1098 | struct cfg80211_bss_ies *ies; |
3afc2167 | 1099 | struct ieee80211_channel *channel; |
9caf0364 | 1100 | struct cfg80211_internal_bss tmp = {}, *res; |
6eb18137 | 1101 | int bss_type; |
67af9811 | 1102 | bool signal_valid; |
06aa7afa JK |
1103 | |
1104 | if (WARN_ON(!wiphy)) | |
1105 | return NULL; | |
1106 | ||
22fe88d3 | 1107 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1108 | (data->signal < 0 || data->signal > 100))) |
06aa7afa JK |
1109 | return NULL; |
1110 | ||
6e19bc4b | 1111 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan); |
0172bb75 JB |
1112 | if (!channel) |
1113 | return NULL; | |
1114 | ||
9caf0364 JB |
1115 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
1116 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1117 | tmp.pub.scan_width = data->scan_width; |
1118 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1119 | tmp.pub.beacon_interval = beacon_interval; |
1120 | tmp.pub.capability = capability; | |
6e19bc4b DS |
1121 | tmp.ts_boottime = data->boottime_ns; |
1122 | ||
34a6eddb | 1123 | /* |
5bc8c1f2 | 1124 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
1125 | * Response frame, we need to pick one of the options and only use it |
1126 | * with the driver that does not provide the full Beacon/Probe Response | |
1127 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 1128 | * override the IEs pointer should we have received an earlier |
9caf0364 | 1129 | * indication of Probe Response data. |
34a6eddb | 1130 | */ |
0e227084 | 1131 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 JB |
1132 | if (!ies) |
1133 | return NULL; | |
1134 | ies->len = ielen; | |
8cef2c9d | 1135 | ies->tsf = tsf; |
0e227084 | 1136 | ies->from_beacon = false; |
9caf0364 | 1137 | memcpy(ies->data, ie, ielen); |
06aa7afa | 1138 | |
5bc8c1f2 JB |
1139 | switch (ftype) { |
1140 | case CFG80211_BSS_FTYPE_BEACON: | |
1141 | ies->from_beacon = true; | |
1142 | /* fall through to assign */ | |
1143 | case CFG80211_BSS_FTYPE_UNKNOWN: | |
1144 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1145 | break; | |
1146 | case CFG80211_BSS_FTYPE_PRESP: | |
1147 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1148 | break; | |
1149 | } | |
9caf0364 | 1150 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 1151 | |
6e19bc4b | 1152 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1153 | wiphy->max_adj_channel_rssi_comp; |
1154 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
06aa7afa JK |
1155 | if (!res) |
1156 | return NULL; | |
1157 | ||
57fbcce3 | 1158 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1159 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1160 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1161 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1162 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1163 | } else { | |
1164 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1165 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1166 | } | |
06aa7afa | 1167 | |
4ee3e063 | 1168 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
1169 | /* cfg80211_bss_update gives us a referenced result */ |
1170 | return &res->pub; | |
1171 | } | |
6e19bc4b | 1172 | EXPORT_SYMBOL(cfg80211_inform_bss_data); |
06aa7afa | 1173 | |
6e19bc4b | 1174 | /* cfg80211_inform_bss_width_frame helper */ |
2a519311 | 1175 | struct cfg80211_bss * |
6e19bc4b DS |
1176 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, |
1177 | struct cfg80211_inform_bss *data, | |
1178 | struct ieee80211_mgmt *mgmt, size_t len, | |
1179 | gfp_t gfp) | |
1180 | ||
2a519311 | 1181 | { |
9caf0364 JB |
1182 | struct cfg80211_internal_bss tmp = {}, *res; |
1183 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 1184 | struct ieee80211_channel *channel; |
67af9811 | 1185 | bool signal_valid; |
2a519311 JB |
1186 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
1187 | u.probe_resp.variable); | |
6eb18137 | 1188 | int bss_type; |
bef9bacc | 1189 | |
0172bb75 JB |
1190 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
1191 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
1192 | ||
6e19bc4b | 1193 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
4ee3e063 | 1194 | |
bef9bacc MK |
1195 | if (WARN_ON(!mgmt)) |
1196 | return NULL; | |
1197 | ||
1198 | if (WARN_ON(!wiphy)) | |
1199 | return NULL; | |
2a519311 | 1200 | |
22fe88d3 | 1201 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1202 | (data->signal < 0 || data->signal > 100))) |
2a519311 JB |
1203 | return NULL; |
1204 | ||
bef9bacc | 1205 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
1206 | return NULL; |
1207 | ||
0172bb75 | 1208 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
6e19bc4b | 1209 | ielen, data->chan); |
0172bb75 JB |
1210 | if (!channel) |
1211 | return NULL; | |
1212 | ||
0e227084 | 1213 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 1214 | if (!ies) |
2a519311 | 1215 | return NULL; |
9caf0364 | 1216 | ies->len = ielen; |
8cef2c9d | 1217 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
0e227084 | 1218 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); |
9caf0364 | 1219 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
2a519311 | 1220 | |
9caf0364 JB |
1221 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
1222 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1223 | else | |
1224 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1225 | rcu_assign_pointer(tmp.pub.ies, ies); | |
505a2e88 | 1226 | |
9caf0364 JB |
1227 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); |
1228 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1229 | tmp.pub.scan_width = data->scan_width; |
1230 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1231 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
1232 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
6e19bc4b | 1233 | tmp.ts_boottime = data->boottime_ns; |
1d76250b AS |
1234 | tmp.parent_tsf = data->parent_tsf; |
1235 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); | |
9caf0364 | 1236 | |
6e19bc4b | 1237 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1238 | wiphy->max_adj_channel_rssi_comp; |
1239 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
2a519311 JB |
1240 | if (!res) |
1241 | return NULL; | |
1242 | ||
57fbcce3 | 1243 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1244 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1245 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1246 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1247 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1248 | } else { | |
1249 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1250 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1251 | } | |
e38f8a7a | 1252 | |
4ee3e063 | 1253 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1254 | /* cfg80211_bss_update gives us a referenced result */ |
1255 | return &res->pub; | |
1256 | } | |
6e19bc4b | 1257 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 1258 | |
5b112d3d | 1259 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 1260 | { |
f26cbf40 | 1261 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
1262 | struct cfg80211_internal_bss *bss; |
1263 | ||
1264 | if (!pub) | |
1265 | return; | |
1266 | ||
1267 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1268 | |
1b8ec87a ZG |
1269 | spin_lock_bh(&rdev->bss_lock); |
1270 | bss_ref_get(rdev, bss); | |
1271 | spin_unlock_bh(&rdev->bss_lock); | |
4c0c0b75 JB |
1272 | } |
1273 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
1274 | ||
5b112d3d | 1275 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 1276 | { |
f26cbf40 | 1277 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
1278 | struct cfg80211_internal_bss *bss; |
1279 | ||
1280 | if (!pub) | |
1281 | return; | |
1282 | ||
1283 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1284 | |
1b8ec87a ZG |
1285 | spin_lock_bh(&rdev->bss_lock); |
1286 | bss_ref_put(rdev, bss); | |
1287 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 JB |
1288 | } |
1289 | EXPORT_SYMBOL(cfg80211_put_bss); | |
1290 | ||
d491af19 JB |
1291 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1292 | { | |
f26cbf40 | 1293 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
d491af19 JB |
1294 | struct cfg80211_internal_bss *bss; |
1295 | ||
1296 | if (WARN_ON(!pub)) | |
1297 | return; | |
1298 | ||
1299 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
1300 | ||
1b8ec87a | 1301 | spin_lock_bh(&rdev->bss_lock); |
3207390a | 1302 | if (!list_empty(&bss->list)) { |
1b8ec87a ZG |
1303 | if (__cfg80211_unlink_bss(rdev, bss)) |
1304 | rdev->bss_generation++; | |
3207390a | 1305 | } |
1b8ec87a | 1306 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
1307 | } |
1308 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
1309 | ||
3d23e349 | 1310 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
1311 | static struct cfg80211_registered_device * |
1312 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
1313 | { | |
5fe231e8 | 1314 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
1315 | struct net_device *dev; |
1316 | ||
5fe231e8 JB |
1317 | ASSERT_RTNL(); |
1318 | ||
9f419f38 JB |
1319 | dev = dev_get_by_index(net, ifindex); |
1320 | if (!dev) | |
5fe231e8 JB |
1321 | return ERR_PTR(-ENODEV); |
1322 | if (dev->ieee80211_ptr) | |
f26cbf40 | 1323 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 1324 | else |
9f419f38 JB |
1325 | rdev = ERR_PTR(-ENODEV); |
1326 | dev_put(dev); | |
9f419f38 JB |
1327 | return rdev; |
1328 | } | |
1329 | ||
2a519311 JB |
1330 | int cfg80211_wext_siwscan(struct net_device *dev, |
1331 | struct iw_request_info *info, | |
1332 | union iwreq_data *wrqu, char *extra) | |
1333 | { | |
1334 | struct cfg80211_registered_device *rdev; | |
1335 | struct wiphy *wiphy; | |
1336 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 1337 | struct cfg80211_scan_request *creq = NULL; |
2a519311 | 1338 | int i, err, n_channels = 0; |
57fbcce3 | 1339 | enum nl80211_band band; |
2a519311 JB |
1340 | |
1341 | if (!netif_running(dev)) | |
1342 | return -ENETDOWN; | |
1343 | ||
b2e3abdc HS |
1344 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
1345 | wreq = (struct iw_scan_req *)extra; | |
1346 | ||
463d0183 | 1347 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1348 | |
1349 | if (IS_ERR(rdev)) | |
1350 | return PTR_ERR(rdev); | |
1351 | ||
f9d15d16 | 1352 | if (rdev->scan_req || rdev->scan_msg) { |
2a519311 JB |
1353 | err = -EBUSY; |
1354 | goto out; | |
1355 | } | |
1356 | ||
1357 | wiphy = &rdev->wiphy; | |
1358 | ||
b2e3abdc HS |
1359 | /* Determine number of channels, needed to allocate creq */ |
1360 | if (wreq && wreq->num_channels) | |
1361 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
1362 | else |
1363 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
1364 | |
1365 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1366 | n_channels * sizeof(void *), | |
1367 | GFP_ATOMIC); | |
1368 | if (!creq) { | |
1369 | err = -ENOMEM; | |
1370 | goto out; | |
1371 | } | |
1372 | ||
1373 | creq->wiphy = wiphy; | |
fd014284 | 1374 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1375 | /* SSIDs come after channels */ |
1376 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1377 | creq->n_channels = n_channels; |
1378 | creq->n_ssids = 1; | |
15d6030b | 1379 | creq->scan_start = jiffies; |
2a519311 | 1380 | |
b2e3abdc | 1381 | /* translate "Scan on frequencies" request */ |
2a519311 | 1382 | i = 0; |
57fbcce3 | 1383 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
2a519311 | 1384 | int j; |
584991dc | 1385 | |
2a519311 JB |
1386 | if (!wiphy->bands[band]) |
1387 | continue; | |
584991dc | 1388 | |
2a519311 | 1389 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1390 | /* ignore disabled channels */ |
1391 | if (wiphy->bands[band]->channels[j].flags & | |
1392 | IEEE80211_CHAN_DISABLED) | |
1393 | continue; | |
b2e3abdc HS |
1394 | |
1395 | /* If we have a wireless request structure and the | |
1396 | * wireless request specifies frequencies, then search | |
1397 | * for the matching hardware channel. | |
1398 | */ | |
1399 | if (wreq && wreq->num_channels) { | |
1400 | int k; | |
1401 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1402 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
1403 | struct iw_freq *freq = |
1404 | &wreq->channel_list[k]; | |
1405 | int wext_freq = | |
1406 | cfg80211_wext_freq(freq); | |
1407 | ||
b2e3abdc HS |
1408 | if (wext_freq == wiphy_freq) |
1409 | goto wext_freq_found; | |
1410 | } | |
1411 | goto wext_freq_not_found; | |
1412 | } | |
1413 | ||
1414 | wext_freq_found: | |
2a519311 JB |
1415 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1416 | i++; | |
b2e3abdc | 1417 | wext_freq_not_found: ; |
2a519311 JB |
1418 | } |
1419 | } | |
8862dc5f HS |
1420 | /* No channels found? */ |
1421 | if (!i) { | |
1422 | err = -EINVAL; | |
1423 | goto out; | |
1424 | } | |
2a519311 | 1425 | |
b2e3abdc HS |
1426 | /* Set real number of channels specified in creq->channels[] */ |
1427 | creq->n_channels = i; | |
2a519311 | 1428 | |
b2e3abdc HS |
1429 | /* translate "Scan for SSID" request */ |
1430 | if (wreq) { | |
2a519311 | 1431 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1432 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1433 | err = -EINVAL; | |
1434 | goto out; | |
1435 | } | |
2a519311 JB |
1436 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1437 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1438 | } | |
1439 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1440 | creq->n_ssids = 0; | |
1441 | } | |
1442 | ||
57fbcce3 | 1443 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
a401d2bb JB |
1444 | if (wiphy->bands[i]) |
1445 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1446 | |
818965d3 JM |
1447 | eth_broadcast_addr(creq->bssid); |
1448 | ||
2a519311 | 1449 | rdev->scan_req = creq; |
e35e4d28 | 1450 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1451 | if (err) { |
1452 | rdev->scan_req = NULL; | |
65486c8b | 1453 | /* creq will be freed below */ |
463d0183 | 1454 | } else { |
fd014284 | 1455 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1456 | /* creq now owned by driver */ |
1457 | creq = NULL; | |
463d0183 JB |
1458 | dev_hold(dev); |
1459 | } | |
2a519311 | 1460 | out: |
65486c8b | 1461 | kfree(creq); |
2a519311 JB |
1462 | return err; |
1463 | } | |
2afe38d1 | 1464 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 1465 | |
76a70e9c JM |
1466 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
1467 | const struct cfg80211_bss_ies *ies, | |
1468 | char *current_ev, char *end_buf) | |
2a519311 | 1469 | { |
9caf0364 | 1470 | const u8 *pos, *end, *next; |
2a519311 JB |
1471 | struct iw_event iwe; |
1472 | ||
9caf0364 | 1473 | if (!ies) |
76a70e9c | 1474 | return current_ev; |
2a519311 JB |
1475 | |
1476 | /* | |
1477 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1478 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1479 | */ | |
9caf0364 JB |
1480 | pos = ies->data; |
1481 | end = pos + ies->len; | |
2a519311 JB |
1482 | |
1483 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1484 | next = pos + 2 + pos[1]; | |
1485 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1486 | next = next + 2 + next[1]; | |
1487 | ||
1488 | memset(&iwe, 0, sizeof(iwe)); | |
1489 | iwe.cmd = IWEVGENIE; | |
1490 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
1491 | current_ev = iwe_stream_add_point_check(info, current_ev, |
1492 | end_buf, &iwe, | |
1493 | (void *)pos); | |
1494 | if (IS_ERR(current_ev)) | |
1495 | return current_ev; | |
2a519311 JB |
1496 | pos = next; |
1497 | } | |
1498 | ||
1499 | if (end > pos) { | |
1500 | memset(&iwe, 0, sizeof(iwe)); | |
1501 | iwe.cmd = IWEVGENIE; | |
1502 | iwe.u.data.length = end - pos; | |
76a70e9c JM |
1503 | current_ev = iwe_stream_add_point_check(info, current_ev, |
1504 | end_buf, &iwe, | |
1505 | (void *)pos); | |
1506 | if (IS_ERR(current_ev)) | |
1507 | return current_ev; | |
2a519311 | 1508 | } |
76a70e9c JM |
1509 | |
1510 | return current_ev; | |
2a519311 JB |
1511 | } |
1512 | ||
2a519311 | 1513 | static char * |
77965c97 JB |
1514 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1515 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1516 | char *end_buf) | |
2a519311 | 1517 | { |
9caf0364 | 1518 | const struct cfg80211_bss_ies *ies; |
2a519311 | 1519 | struct iw_event iwe; |
9caf0364 | 1520 | const u8 *ie; |
76a70e9c JM |
1521 | u8 buf[50]; |
1522 | u8 *cfg, *p, *tmp; | |
9caf0364 | 1523 | int rem, i, sig; |
2a519311 JB |
1524 | bool ismesh = false; |
1525 | ||
1526 | memset(&iwe, 0, sizeof(iwe)); | |
1527 | iwe.cmd = SIOCGIWAP; | |
1528 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1529 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
1530 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1531 | IW_EV_ADDR_LEN); | |
1532 | if (IS_ERR(current_ev)) | |
1533 | return current_ev; | |
2a519311 JB |
1534 | |
1535 | memset(&iwe, 0, sizeof(iwe)); | |
1536 | iwe.cmd = SIOCGIWFREQ; | |
1537 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1538 | iwe.u.freq.e = 0; | |
76a70e9c JM |
1539 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1540 | IW_EV_FREQ_LEN); | |
1541 | if (IS_ERR(current_ev)) | |
1542 | return current_ev; | |
2a519311 JB |
1543 | |
1544 | memset(&iwe, 0, sizeof(iwe)); | |
1545 | iwe.cmd = SIOCGIWFREQ; | |
1546 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1547 | iwe.u.freq.e = 6; | |
76a70e9c JM |
1548 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1549 | IW_EV_FREQ_LEN); | |
1550 | if (IS_ERR(current_ev)) | |
1551 | return current_ev; | |
2a519311 | 1552 | |
77965c97 | 1553 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1554 | memset(&iwe, 0, sizeof(iwe)); |
1555 | iwe.cmd = IWEVQUAL; | |
1556 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1557 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1558 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1559 | switch (wiphy->signal_type) { |
2a519311 | 1560 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1561 | sig = bss->pub.signal / 100; |
1562 | iwe.u.qual.level = sig; | |
2a519311 | 1563 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1564 | if (sig < -110) /* rather bad */ |
1565 | sig = -110; | |
1566 | else if (sig > -40) /* perfect */ | |
1567 | sig = -40; | |
1568 | /* will give a range of 0 .. 70 */ | |
1569 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1570 | break; |
1571 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1572 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1573 | /* will give range 0 .. 100 */ |
1574 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1575 | break; |
1576 | default: | |
1577 | /* not reached */ | |
1578 | break; | |
1579 | } | |
76a70e9c JM |
1580 | current_ev = iwe_stream_add_event_check(info, current_ev, |
1581 | end_buf, &iwe, | |
1582 | IW_EV_QUAL_LEN); | |
1583 | if (IS_ERR(current_ev)) | |
1584 | return current_ev; | |
2a519311 JB |
1585 | } |
1586 | ||
1587 | memset(&iwe, 0, sizeof(iwe)); | |
1588 | iwe.cmd = SIOCGIWENCODE; | |
1589 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1590 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1591 | else | |
1592 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1593 | iwe.u.data.length = 0; | |
76a70e9c JM |
1594 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
1595 | &iwe, ""); | |
1596 | if (IS_ERR(current_ev)) | |
1597 | return current_ev; | |
2a519311 | 1598 | |
9caf0364 JB |
1599 | rcu_read_lock(); |
1600 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
1601 | rem = ies->len; |
1602 | ie = ies->data; | |
9caf0364 | 1603 | |
83c7aa1a | 1604 | while (rem >= 2) { |
2a519311 JB |
1605 | /* invalid data */ |
1606 | if (ie[1] > rem - 2) | |
1607 | break; | |
1608 | ||
1609 | switch (ie[0]) { | |
1610 | case WLAN_EID_SSID: | |
1611 | memset(&iwe, 0, sizeof(iwe)); | |
1612 | iwe.cmd = SIOCGIWESSID; | |
1613 | iwe.u.data.length = ie[1]; | |
1614 | iwe.u.data.flags = 1; | |
76a70e9c JM |
1615 | current_ev = iwe_stream_add_point_check(info, |
1616 | current_ev, | |
1617 | end_buf, &iwe, | |
1618 | (u8 *)ie + 2); | |
1619 | if (IS_ERR(current_ev)) | |
1620 | goto unlock; | |
2a519311 JB |
1621 | break; |
1622 | case WLAN_EID_MESH_ID: | |
1623 | memset(&iwe, 0, sizeof(iwe)); | |
1624 | iwe.cmd = SIOCGIWESSID; | |
1625 | iwe.u.data.length = ie[1]; | |
1626 | iwe.u.data.flags = 1; | |
76a70e9c JM |
1627 | current_ev = iwe_stream_add_point_check(info, |
1628 | current_ev, | |
1629 | end_buf, &iwe, | |
1630 | (u8 *)ie + 2); | |
1631 | if (IS_ERR(current_ev)) | |
1632 | goto unlock; | |
2a519311 JB |
1633 | break; |
1634 | case WLAN_EID_MESH_CONFIG: | |
1635 | ismesh = true; | |
136cfa28 | 1636 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 1637 | break; |
9caf0364 | 1638 | cfg = (u8 *)ie + 2; |
2a519311 JB |
1639 | memset(&iwe, 0, sizeof(iwe)); |
1640 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1641 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1642 | "0x%02X", cfg[0]); | |
2a519311 | 1643 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1644 | current_ev = iwe_stream_add_point_check(info, |
1645 | current_ev, | |
1646 | end_buf, | |
1647 | &iwe, buf); | |
1648 | if (IS_ERR(current_ev)) | |
1649 | goto unlock; | |
76aa5e70 RP |
1650 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1651 | cfg[1]); | |
2a519311 | 1652 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1653 | current_ev = iwe_stream_add_point_check(info, |
1654 | current_ev, | |
1655 | end_buf, | |
1656 | &iwe, buf); | |
1657 | if (IS_ERR(current_ev)) | |
1658 | goto unlock; | |
76aa5e70 RP |
1659 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1660 | cfg[2]); | |
2a519311 | 1661 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1662 | current_ev = iwe_stream_add_point_check(info, |
1663 | current_ev, | |
1664 | end_buf, | |
1665 | &iwe, buf); | |
1666 | if (IS_ERR(current_ev)) | |
1667 | goto unlock; | |
76aa5e70 | 1668 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 | 1669 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1670 | current_ev = iwe_stream_add_point_check(info, |
1671 | current_ev, | |
1672 | end_buf, | |
1673 | &iwe, buf); | |
1674 | if (IS_ERR(current_ev)) | |
1675 | goto unlock; | |
76aa5e70 RP |
1676 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1677 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
1678 | current_ev = iwe_stream_add_point_check(info, |
1679 | current_ev, | |
1680 | end_buf, | |
1681 | &iwe, buf); | |
1682 | if (IS_ERR(current_ev)) | |
1683 | goto unlock; | |
76aa5e70 RP |
1684 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
1685 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
1686 | current_ev = iwe_stream_add_point_check(info, |
1687 | current_ev, | |
1688 | end_buf, | |
1689 | &iwe, buf); | |
1690 | if (IS_ERR(current_ev)) | |
1691 | goto unlock; | |
76aa5e70 | 1692 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
2a519311 | 1693 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1694 | current_ev = iwe_stream_add_point_check(info, |
1695 | current_ev, | |
1696 | end_buf, | |
1697 | &iwe, buf); | |
1698 | if (IS_ERR(current_ev)) | |
1699 | goto unlock; | |
2a519311 JB |
1700 | break; |
1701 | case WLAN_EID_SUPP_RATES: | |
1702 | case WLAN_EID_EXT_SUPP_RATES: | |
1703 | /* display all supported rates in readable format */ | |
1704 | p = current_ev + iwe_stream_lcp_len(info); | |
1705 | ||
1706 | memset(&iwe, 0, sizeof(iwe)); | |
1707 | iwe.cmd = SIOCGIWRATE; | |
1708 | /* Those two flags are ignored... */ | |
1709 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1710 | ||
1711 | for (i = 0; i < ie[1]; i++) { | |
1712 | iwe.u.bitrate.value = | |
1713 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 1714 | tmp = p; |
2a519311 | 1715 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
1716 | end_buf, &iwe, |
1717 | IW_EV_PARAM_LEN); | |
1718 | if (p == tmp) { | |
1719 | current_ev = ERR_PTR(-E2BIG); | |
1720 | goto unlock; | |
1721 | } | |
2a519311 JB |
1722 | } |
1723 | current_ev = p; | |
1724 | break; | |
1725 | } | |
1726 | rem -= ie[1] + 2; | |
1727 | ie += ie[1] + 2; | |
1728 | } | |
1729 | ||
f64f9e71 JP |
1730 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1731 | ismesh) { | |
2a519311 JB |
1732 | memset(&iwe, 0, sizeof(iwe)); |
1733 | iwe.cmd = SIOCGIWMODE; | |
1734 | if (ismesh) | |
1735 | iwe.u.mode = IW_MODE_MESH; | |
1736 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1737 | iwe.u.mode = IW_MODE_MASTER; | |
1738 | else | |
1739 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
1740 | current_ev = iwe_stream_add_event_check(info, current_ev, |
1741 | end_buf, &iwe, | |
1742 | IW_EV_UINT_LEN); | |
1743 | if (IS_ERR(current_ev)) | |
1744 | goto unlock; | |
2a519311 JB |
1745 | } |
1746 | ||
76a70e9c JM |
1747 | memset(&iwe, 0, sizeof(iwe)); |
1748 | iwe.cmd = IWEVCUSTOM; | |
1749 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); | |
1750 | iwe.u.data.length = strlen(buf); | |
1751 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, | |
1752 | &iwe, buf); | |
1753 | if (IS_ERR(current_ev)) | |
1754 | goto unlock; | |
1755 | memset(&iwe, 0, sizeof(iwe)); | |
1756 | iwe.cmd = IWEVCUSTOM; | |
1757 | sprintf(buf, " Last beacon: %ums ago", | |
1758 | elapsed_jiffies_msecs(bss->ts)); | |
1759 | iwe.u.data.length = strlen(buf); | |
1760 | current_ev = iwe_stream_add_point_check(info, current_ev, | |
1761 | end_buf, &iwe, buf); | |
1762 | if (IS_ERR(current_ev)) | |
1763 | goto unlock; | |
1764 | ||
1765 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
1766 | ||
1767 | unlock: | |
9caf0364 | 1768 | rcu_read_unlock(); |
2a519311 JB |
1769 | return current_ev; |
1770 | } | |
1771 | ||
1772 | ||
1b8ec87a | 1773 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
1774 | struct iw_request_info *info, |
1775 | char *buf, size_t len) | |
1776 | { | |
1777 | char *current_ev = buf; | |
1778 | char *end_buf = buf + len; | |
1779 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 1780 | int err = 0; |
2a519311 | 1781 | |
1b8ec87a ZG |
1782 | spin_lock_bh(&rdev->bss_lock); |
1783 | cfg80211_bss_expire(rdev); | |
2a519311 | 1784 | |
1b8ec87a | 1785 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 1786 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
1787 | err = -E2BIG; |
1788 | break; | |
2a519311 | 1789 | } |
1b8ec87a | 1790 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 1791 | current_ev, end_buf); |
76a70e9c JM |
1792 | if (IS_ERR(current_ev)) { |
1793 | err = PTR_ERR(current_ev); | |
1794 | break; | |
1795 | } | |
2a519311 | 1796 | } |
1b8ec87a | 1797 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
1798 | |
1799 | if (err) | |
1800 | return err; | |
2a519311 JB |
1801 | return current_ev - buf; |
1802 | } | |
1803 | ||
1804 | ||
1805 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1806 | struct iw_request_info *info, | |
1807 | struct iw_point *data, char *extra) | |
1808 | { | |
1809 | struct cfg80211_registered_device *rdev; | |
1810 | int res; | |
1811 | ||
1812 | if (!netif_running(dev)) | |
1813 | return -ENETDOWN; | |
1814 | ||
463d0183 | 1815 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1816 | |
1817 | if (IS_ERR(rdev)) | |
1818 | return PTR_ERR(rdev); | |
1819 | ||
f9d15d16 | 1820 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 1821 | return -EAGAIN; |
2a519311 JB |
1822 | |
1823 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1824 | data->length = 0; | |
1825 | if (res >= 0) { | |
1826 | data->length = res; | |
1827 | res = 0; | |
1828 | } | |
1829 | ||
2a519311 JB |
1830 | return res; |
1831 | } | |
2afe38d1 | 1832 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 1833 | #endif |