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Commit | Line | Data |
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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 | ||
807f8a8c LC |
303 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
304 | { | |
305 | struct cfg80211_registered_device *rdev; | |
15d6030b | 306 | struct cfg80211_sched_scan_request *request; |
807f8a8c LC |
307 | |
308 | rdev = container_of(wk, struct cfg80211_registered_device, | |
309 | sched_scan_results_wk); | |
310 | ||
5fe231e8 | 311 | rtnl_lock(); |
807f8a8c | 312 | |
31a60ed1 | 313 | request = rtnl_dereference(rdev->sched_scan_req); |
79845c66 | 314 | |
807f8a8c | 315 | /* we don't have sched_scan_req anymore if the scan is stopping */ |
15d6030b SL |
316 | if (request) { |
317 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
318 | /* flush entries from previous scans */ | |
319 | spin_lock_bh(&rdev->bss_lock); | |
320 | __cfg80211_bss_expire(rdev, request->scan_start); | |
321 | spin_unlock_bh(&rdev->bss_lock); | |
3b06d277 | 322 | request->scan_start = jiffies; |
15d6030b | 323 | } |
505a2e88 AVS |
324 | nl80211_send_sched_scan(rdev, request->dev, |
325 | NL80211_CMD_SCHED_SCAN_RESULTS); | |
15d6030b | 326 | } |
807f8a8c | 327 | |
5fe231e8 | 328 | rtnl_unlock(); |
807f8a8c LC |
329 | } |
330 | ||
331 | void cfg80211_sched_scan_results(struct wiphy *wiphy) | |
332 | { | |
4ee3e063 | 333 | trace_cfg80211_sched_scan_results(wiphy); |
807f8a8c | 334 | /* ignore if we're not scanning */ |
31a60ed1 JR |
335 | |
336 | if (rcu_access_pointer(wiphy_to_rdev(wiphy)->sched_scan_req)) | |
807f8a8c | 337 | queue_work(cfg80211_wq, |
f26cbf40 | 338 | &wiphy_to_rdev(wiphy)->sched_scan_results_wk); |
807f8a8c LC |
339 | } |
340 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
341 | ||
792e6aa7 | 342 | void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy) |
807f8a8c | 343 | { |
f26cbf40 | 344 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 345 | |
792e6aa7 EP |
346 | ASSERT_RTNL(); |
347 | ||
4ee3e063 BL |
348 | trace_cfg80211_sched_scan_stopped(wiphy); |
349 | ||
807f8a8c | 350 | __cfg80211_stop_sched_scan(rdev, true); |
792e6aa7 EP |
351 | } |
352 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl); | |
353 | ||
354 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) | |
355 | { | |
356 | rtnl_lock(); | |
357 | cfg80211_sched_scan_stopped_rtnl(wiphy); | |
5fe231e8 | 358 | rtnl_unlock(); |
807f8a8c | 359 | } |
807f8a8c LC |
360 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
361 | ||
362 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, | |
363 | bool driver_initiated) | |
364 | { | |
31a60ed1 | 365 | struct cfg80211_sched_scan_request *sched_scan_req; |
807f8a8c LC |
366 | struct net_device *dev; |
367 | ||
5fe231e8 | 368 | ASSERT_RTNL(); |
807f8a8c LC |
369 | |
370 | if (!rdev->sched_scan_req) | |
1a84ff75 | 371 | return -ENOENT; |
807f8a8c | 372 | |
31a60ed1 JR |
373 | sched_scan_req = rtnl_dereference(rdev->sched_scan_req); |
374 | dev = sched_scan_req->dev; | |
807f8a8c | 375 | |
85a9994a | 376 | if (!driver_initiated) { |
e35e4d28 | 377 | int err = rdev_sched_scan_stop(rdev, dev); |
85a9994a LC |
378 | if (err) |
379 | return err; | |
380 | } | |
807f8a8c LC |
381 | |
382 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); | |
383 | ||
31a60ed1 JR |
384 | RCU_INIT_POINTER(rdev->sched_scan_req, NULL); |
385 | kfree_rcu(sched_scan_req, rcu_head); | |
807f8a8c | 386 | |
3b4670ff | 387 | return 0; |
807f8a8c LC |
388 | } |
389 | ||
1b8ec87a | 390 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
391 | unsigned long age_secs) |
392 | { | |
393 | struct cfg80211_internal_bss *bss; | |
394 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
395 | ||
1b8ec87a ZG |
396 | spin_lock_bh(&rdev->bss_lock); |
397 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 398 | bss->ts -= age_jiffies; |
1b8ec87a | 399 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
400 | } |
401 | ||
1b8ec87a | 402 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 403 | { |
1b8ec87a | 404 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
405 | } |
406 | ||
fbd05e4a LC |
407 | const u8 *cfg80211_find_ie_match(u8 eid, const u8 *ies, int len, |
408 | const u8 *match, int match_len, | |
409 | int match_offset) | |
2a519311 | 410 | { |
fbd05e4a LC |
411 | /* match_offset can't be smaller than 2, unless match_len is |
412 | * zero, in which case match_offset must be zero as well. | |
413 | */ | |
414 | if (WARN_ON((match_len && match_offset < 2) || | |
415 | (!match_len && match_offset))) | |
416 | return NULL; | |
417 | ||
418 | while (len >= 2 && len >= ies[1] + 2) { | |
419 | if ((ies[0] == eid) && | |
420 | (ies[1] + 2 >= match_offset + match_len) && | |
421 | !memcmp(ies + match_offset, match, match_len)) | |
422 | return ies; | |
423 | ||
2a519311 JB |
424 | len -= ies[1] + 2; |
425 | ies += ies[1] + 2; | |
426 | } | |
fbd05e4a LC |
427 | |
428 | return NULL; | |
2a519311 | 429 | } |
fbd05e4a | 430 | EXPORT_SYMBOL(cfg80211_find_ie_match); |
2a519311 | 431 | |
9e9ea439 | 432 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, int oui_type, |
0c28ec58 EP |
433 | const u8 *ies, int len) |
434 | { | |
fbd05e4a LC |
435 | const u8 *ie; |
436 | u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; | |
437 | int match_len = (oui_type < 0) ? 3 : sizeof(match); | |
0c28ec58 | 438 | |
9e9ea439 EG |
439 | if (WARN_ON(oui_type > 0xff)) |
440 | return NULL; | |
441 | ||
fbd05e4a LC |
442 | ie = cfg80211_find_ie_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, |
443 | match, match_len, 2); | |
6719429d | 444 | |
fbd05e4a LC |
445 | if (ie && (ie[1] < 4)) |
446 | return NULL; | |
6719429d | 447 | |
fbd05e4a | 448 | return ie; |
0c28ec58 EP |
449 | } |
450 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
451 | ||
915de2ff | 452 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
2a519311 JB |
453 | const u8 *ssid, size_t ssid_len) |
454 | { | |
9caf0364 | 455 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
456 | const u8 *ssidie; |
457 | ||
ac422d3c | 458 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
459 | return false; |
460 | ||
79420f09 JB |
461 | if (!ssid) |
462 | return true; | |
463 | ||
9caf0364 JB |
464 | ies = rcu_access_pointer(a->ies); |
465 | if (!ies) | |
466 | return false; | |
467 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
2a519311 JB |
468 | if (!ssidie) |
469 | return false; | |
470 | if (ssidie[1] != ssid_len) | |
471 | return false; | |
472 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
473 | } | |
474 | ||
4593c4cb JB |
475 | /** |
476 | * enum bss_compare_mode - BSS compare mode | |
477 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
478 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
479 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
480 | */ | |
481 | enum bss_compare_mode { | |
482 | BSS_CMP_REGULAR, | |
483 | BSS_CMP_HIDE_ZLEN, | |
484 | BSS_CMP_HIDE_NUL, | |
485 | }; | |
486 | ||
dd9dfb9f | 487 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 488 | struct cfg80211_bss *b, |
4593c4cb | 489 | enum bss_compare_mode mode) |
dd9dfb9f | 490 | { |
9caf0364 | 491 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
492 | const u8 *ie1 = NULL; |
493 | const u8 *ie2 = NULL; | |
5622f5bb | 494 | int i, r; |
dd9dfb9f | 495 | |
3af6341c JB |
496 | if (a->channel != b->channel) |
497 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 498 | |
9caf0364 JB |
499 | a_ies = rcu_access_pointer(a->ies); |
500 | if (!a_ies) | |
501 | return -1; | |
502 | b_ies = rcu_access_pointer(b->ies); | |
503 | if (!b_ies) | |
504 | return 1; | |
505 | ||
3af6341c JB |
506 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
507 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
508 | a_ies->data, a_ies->len); | |
509 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
510 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
511 | b_ies->data, b_ies->len); | |
512 | if (ie1 && ie2) { | |
513 | int mesh_id_cmp; | |
514 | ||
515 | if (ie1[1] == ie2[1]) | |
516 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
517 | else | |
518 | mesh_id_cmp = ie2[1] - ie1[1]; | |
519 | ||
520 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
521 | a_ies->data, a_ies->len); | |
522 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
523 | b_ies->data, b_ies->len); | |
524 | if (ie1 && ie2) { | |
525 | if (mesh_id_cmp) | |
526 | return mesh_id_cmp; | |
527 | if (ie1[1] != ie2[1]) | |
528 | return ie2[1] - ie1[1]; | |
529 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
530 | } | |
531 | } | |
532 | ||
3af6341c JB |
533 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
534 | if (r) | |
535 | return r; | |
536 | ||
9caf0364 JB |
537 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
538 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 539 | |
5622f5bb JB |
540 | if (!ie1 && !ie2) |
541 | return 0; | |
542 | ||
f94f8b16 | 543 | /* |
5622f5bb JB |
544 | * Note that with "hide_ssid", the function returns a match if |
545 | * the already-present BSS ("b") is a hidden SSID beacon for | |
546 | * the new BSS ("a"). | |
f94f8b16 | 547 | */ |
dd9dfb9f DT |
548 | |
549 | /* sort missing IE before (left of) present IE */ | |
550 | if (!ie1) | |
551 | return -1; | |
552 | if (!ie2) | |
553 | return 1; | |
554 | ||
4593c4cb JB |
555 | switch (mode) { |
556 | case BSS_CMP_HIDE_ZLEN: | |
557 | /* | |
558 | * In ZLEN mode we assume the BSS entry we're | |
559 | * looking for has a zero-length SSID. So if | |
560 | * the one we're looking at right now has that, | |
561 | * return 0. Otherwise, return the difference | |
562 | * in length, but since we're looking for the | |
563 | * 0-length it's really equivalent to returning | |
564 | * the length of the one we're looking at. | |
565 | * | |
566 | * No content comparison is needed as we assume | |
567 | * the content length is zero. | |
568 | */ | |
569 | return ie2[1]; | |
570 | case BSS_CMP_REGULAR: | |
571 | default: | |
572 | /* sort by length first, then by contents */ | |
573 | if (ie1[1] != ie2[1]) | |
574 | return ie2[1] - ie1[1]; | |
5622f5bb | 575 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
576 | case BSS_CMP_HIDE_NUL: |
577 | if (ie1[1] != ie2[1]) | |
578 | return ie2[1] - ie1[1]; | |
579 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
580 | for (i = 0; i < ie2[1]; i++) | |
581 | if (ie2[i + 2]) | |
582 | return -1; | |
583 | return 0; | |
584 | } | |
dd9dfb9f DT |
585 | } |
586 | ||
6eb18137 | 587 | static bool cfg80211_bss_type_match(u16 capability, |
57fbcce3 | 588 | enum nl80211_band band, |
6eb18137 DL |
589 | enum ieee80211_bss_type bss_type) |
590 | { | |
591 | bool ret = true; | |
592 | u16 mask, val; | |
593 | ||
594 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
595 | return ret; | |
596 | ||
57fbcce3 | 597 | if (band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
598 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
599 | switch (bss_type) { | |
600 | case IEEE80211_BSS_TYPE_ESS: | |
601 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
602 | break; | |
603 | case IEEE80211_BSS_TYPE_PBSS: | |
604 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
605 | break; | |
606 | case IEEE80211_BSS_TYPE_IBSS: | |
607 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
608 | break; | |
609 | default: | |
610 | return false; | |
611 | } | |
612 | } else { | |
613 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
614 | switch (bss_type) { | |
615 | case IEEE80211_BSS_TYPE_ESS: | |
616 | val = WLAN_CAPABILITY_ESS; | |
617 | break; | |
618 | case IEEE80211_BSS_TYPE_IBSS: | |
619 | val = WLAN_CAPABILITY_IBSS; | |
620 | break; | |
621 | case IEEE80211_BSS_TYPE_MBSS: | |
622 | val = 0; | |
623 | break; | |
624 | default: | |
625 | return false; | |
626 | } | |
627 | } | |
628 | ||
629 | ret = ((capability & mask) == val); | |
630 | return ret; | |
631 | } | |
632 | ||
0e3a39b5 | 633 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 JB |
634 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
635 | struct ieee80211_channel *channel, | |
636 | const u8 *bssid, | |
79420f09 | 637 | const u8 *ssid, size_t ssid_len, |
6eb18137 DL |
638 | enum ieee80211_bss_type bss_type, |
639 | enum ieee80211_privacy privacy) | |
2a519311 | 640 | { |
f26cbf40 | 641 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 642 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 643 | unsigned long now = jiffies; |
6eb18137 | 644 | int bss_privacy; |
2a519311 | 645 | |
6eb18137 DL |
646 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
647 | privacy); | |
4ee3e063 | 648 | |
1b8ec87a | 649 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 650 | |
1b8ec87a | 651 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
652 | if (!cfg80211_bss_type_match(bss->pub.capability, |
653 | bss->pub.channel->band, bss_type)) | |
654 | continue; | |
655 | ||
656 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
657 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
658 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 659 | continue; |
2a519311 JB |
660 | if (channel && bss->pub.channel != channel) |
661 | continue; | |
c14a7400 JB |
662 | if (!is_valid_ether_addr(bss->pub.bssid)) |
663 | continue; | |
ccb6c136 JB |
664 | /* Don't get expired BSS structs */ |
665 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
666 | !atomic_read(&bss->hold)) | |
667 | continue; | |
2a519311 JB |
668 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
669 | res = bss; | |
1b8ec87a | 670 | bss_ref_get(rdev, res); |
2a519311 JB |
671 | break; |
672 | } | |
673 | } | |
674 | ||
1b8ec87a | 675 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
676 | if (!res) |
677 | return NULL; | |
4ee3e063 | 678 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
679 | return &res->pub; |
680 | } | |
681 | EXPORT_SYMBOL(cfg80211_get_bss); | |
682 | ||
1b8ec87a | 683 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
684 | struct cfg80211_internal_bss *bss) |
685 | { | |
1b8ec87a | 686 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
687 | struct rb_node *parent = NULL; |
688 | struct cfg80211_internal_bss *tbss; | |
689 | int cmp; | |
690 | ||
691 | while (*p) { | |
692 | parent = *p; | |
693 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
694 | ||
4593c4cb | 695 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
696 | |
697 | if (WARN_ON(!cmp)) { | |
698 | /* will sort of leak this BSS */ | |
699 | return; | |
700 | } | |
701 | ||
702 | if (cmp < 0) | |
703 | p = &(*p)->rb_left; | |
704 | else | |
705 | p = &(*p)->rb_right; | |
706 | } | |
707 | ||
708 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 709 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
710 | } |
711 | ||
712 | static struct cfg80211_internal_bss * | |
1b8ec87a | 713 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 714 | struct cfg80211_internal_bss *res, |
4593c4cb | 715 | enum bss_compare_mode mode) |
dd9dfb9f | 716 | { |
1b8ec87a | 717 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
718 | struct cfg80211_internal_bss *bss; |
719 | int r; | |
720 | ||
721 | while (n) { | |
722 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 723 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
724 | |
725 | if (r == 0) | |
726 | return bss; | |
727 | else if (r < 0) | |
728 | n = n->rb_left; | |
729 | else | |
730 | n = n->rb_right; | |
731 | } | |
732 | ||
733 | return NULL; | |
734 | } | |
735 | ||
1b8ec87a | 736 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 737 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 738 | { |
9caf0364 | 739 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
740 | struct cfg80211_internal_bss *bss; |
741 | const u8 *ie; | |
742 | int i, ssidlen; | |
743 | u8 fold = 0; | |
9853a55e | 744 | u32 n_entries = 0; |
9caf0364 | 745 | |
776b3580 | 746 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 747 | if (WARN_ON(!ies)) |
776b3580 | 748 | return false; |
dd9dfb9f | 749 | |
776b3580 JB |
750 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
751 | if (!ie) { | |
752 | /* nothing to do */ | |
753 | return true; | |
754 | } | |
755 | ||
756 | ssidlen = ie[1]; | |
757 | for (i = 0; i < ssidlen; i++) | |
758 | fold |= ie[2 + i]; | |
759 | ||
760 | if (fold) { | |
761 | /* not a hidden SSID */ | |
762 | return true; | |
763 | } | |
764 | ||
765 | /* This is the bad part ... */ | |
766 | ||
1b8ec87a | 767 | list_for_each_entry(bss, &rdev->bss_list, list) { |
9853a55e JB |
768 | /* |
769 | * we're iterating all the entries anyway, so take the | |
770 | * opportunity to validate the list length accounting | |
771 | */ | |
772 | n_entries++; | |
773 | ||
776b3580 JB |
774 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
775 | continue; | |
776 | if (bss->pub.channel != new->pub.channel) | |
777 | continue; | |
dcd6eac1 SW |
778 | if (bss->pub.scan_width != new->pub.scan_width) |
779 | continue; | |
776b3580 JB |
780 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
781 | continue; | |
782 | ies = rcu_access_pointer(bss->pub.ies); | |
783 | if (!ies) | |
784 | continue; | |
785 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
786 | if (!ie) | |
787 | continue; | |
788 | if (ssidlen && ie[1] != ssidlen) | |
789 | continue; | |
776b3580 JB |
790 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
791 | continue; | |
792 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
793 | list_del(&bss->hidden_list); | |
794 | /* combine them */ | |
795 | list_add(&bss->hidden_list, &new->hidden_list); | |
796 | bss->pub.hidden_beacon_bss = &new->pub; | |
797 | new->refcount += bss->refcount; | |
798 | rcu_assign_pointer(bss->pub.beacon_ies, | |
799 | new->pub.beacon_ies); | |
800 | } | |
801 | ||
9853a55e JB |
802 | WARN_ONCE(n_entries != rdev->bss_entries, |
803 | "rdev bss entries[%d]/list[len:%d] corruption\n", | |
804 | rdev->bss_entries, n_entries); | |
805 | ||
776b3580 | 806 | return true; |
dd9dfb9f DT |
807 | } |
808 | ||
0e3a39b5 | 809 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 | 810 | static struct cfg80211_internal_bss * |
1b8ec87a | 811 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
3afc2167 EG |
812 | struct cfg80211_internal_bss *tmp, |
813 | bool signal_valid) | |
2a519311 JB |
814 | { |
815 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 816 | |
9caf0364 | 817 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 818 | return NULL; |
2a519311 | 819 | |
9caf0364 | 820 | tmp->ts = jiffies; |
2a519311 | 821 | |
1b8ec87a | 822 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 823 | |
9caf0364 | 824 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
1b8ec87a | 825 | spin_unlock_bh(&rdev->bss_lock); |
9caf0364 JB |
826 | return NULL; |
827 | } | |
828 | ||
1b8ec87a | 829 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 830 | |
cd1658f5 | 831 | if (found) { |
34a6eddb | 832 | /* Update IEs */ |
9caf0364 JB |
833 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
834 | const struct cfg80211_bss_ies *old; | |
835 | ||
836 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 837 | |
9caf0364 JB |
838 | rcu_assign_pointer(found->pub.proberesp_ies, |
839 | tmp->pub.proberesp_ies); | |
34a6eddb | 840 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
841 | rcu_assign_pointer(found->pub.ies, |
842 | tmp->pub.proberesp_ies); | |
843 | if (old) | |
844 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
845 | rcu_head); | |
846 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
9537f227 | 847 | const struct cfg80211_bss_ies *old; |
776b3580 JB |
848 | struct cfg80211_internal_bss *bss; |
849 | ||
850 | if (found->pub.hidden_beacon_bss && | |
851 | !list_empty(&found->hidden_list)) { | |
1345ee6a JB |
852 | const struct cfg80211_bss_ies *f; |
853 | ||
776b3580 JB |
854 | /* |
855 | * The found BSS struct is one of the probe | |
856 | * response members of a group, but we're | |
857 | * receiving a beacon (beacon_ies in the tmp | |
858 | * bss is used). This can only mean that the | |
859 | * AP changed its beacon from not having an | |
860 | * SSID to showing it, which is confusing so | |
861 | * drop this information. | |
862 | */ | |
1345ee6a JB |
863 | |
864 | f = rcu_access_pointer(tmp->pub.beacon_ies); | |
865 | kfree_rcu((struct cfg80211_bss_ies *)f, | |
866 | rcu_head); | |
776b3580 JB |
867 | goto drop; |
868 | } | |
915de2ff | 869 | |
9caf0364 | 870 | old = rcu_access_pointer(found->pub.beacon_ies); |
9caf0364 JB |
871 | |
872 | rcu_assign_pointer(found->pub.beacon_ies, | |
873 | tmp->pub.beacon_ies); | |
01123e23 SN |
874 | |
875 | /* Override IEs if they were from a beacon before */ | |
9537f227 | 876 | if (old == rcu_access_pointer(found->pub.ies)) |
9caf0364 JB |
877 | rcu_assign_pointer(found->pub.ies, |
878 | tmp->pub.beacon_ies); | |
cd1658f5 | 879 | |
776b3580 JB |
880 | /* Assign beacon IEs to all sub entries */ |
881 | list_for_each_entry(bss, &found->hidden_list, | |
882 | hidden_list) { | |
883 | const struct cfg80211_bss_ies *ies; | |
884 | ||
885 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
886 | WARN_ON(ies != old); | |
887 | ||
888 | rcu_assign_pointer(bss->pub.beacon_ies, | |
889 | tmp->pub.beacon_ies); | |
890 | } | |
891 | ||
9caf0364 JB |
892 | if (old) |
893 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
894 | rcu_head); | |
895 | } | |
1345ee6a JB |
896 | |
897 | found->pub.beacon_interval = tmp->pub.beacon_interval; | |
3afc2167 EG |
898 | /* |
899 | * don't update the signal if beacon was heard on | |
900 | * adjacent channel. | |
901 | */ | |
902 | if (signal_valid) | |
903 | found->pub.signal = tmp->pub.signal; | |
1345ee6a JB |
904 | found->pub.capability = tmp->pub.capability; |
905 | found->ts = tmp->ts; | |
6e19bc4b | 906 | found->ts_boottime = tmp->ts_boottime; |
1d76250b AS |
907 | found->parent_tsf = tmp->parent_tsf; |
908 | ether_addr_copy(found->parent_bssid, tmp->parent_bssid); | |
2a519311 | 909 | } else { |
9caf0364 | 910 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 911 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 912 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 913 | |
9caf0364 JB |
914 | /* |
915 | * create a copy -- the "res" variable that is passed in | |
916 | * is allocated on the stack since it's not needed in the | |
917 | * more common case of an update | |
918 | */ | |
1b8ec87a | 919 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
920 | GFP_ATOMIC); |
921 | if (!new) { | |
922 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
923 | if (ies) | |
924 | kfree_rcu(ies, rcu_head); | |
925 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
926 | if (ies) | |
927 | kfree_rcu(ies, rcu_head); | |
776b3580 | 928 | goto drop; |
9caf0364 JB |
929 | } |
930 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
931 | new->refcount = 1; |
932 | INIT_LIST_HEAD(&new->hidden_list); | |
933 | ||
934 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 935 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 936 | if (!hidden) |
1b8ec87a | 937 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
938 | BSS_CMP_HIDE_NUL); |
939 | if (hidden) { | |
940 | new->pub.hidden_beacon_bss = &hidden->pub; | |
941 | list_add(&new->hidden_list, | |
942 | &hidden->hidden_list); | |
943 | hidden->refcount++; | |
944 | rcu_assign_pointer(new->pub.beacon_ies, | |
945 | hidden->pub.beacon_ies); | |
946 | } | |
947 | } else { | |
948 | /* | |
949 | * Ok so we found a beacon, and don't have an entry. If | |
950 | * it's a beacon with hidden SSID, we might be in for an | |
951 | * expensive search for any probe responses that should | |
952 | * be grouped with this beacon for updates ... | |
953 | */ | |
1b8ec87a | 954 | if (!cfg80211_combine_bsses(rdev, new)) { |
776b3580 JB |
955 | kfree(new); |
956 | goto drop; | |
957 | } | |
958 | } | |
959 | ||
9853a55e JB |
960 | if (rdev->bss_entries >= bss_entries_limit && |
961 | !cfg80211_bss_expire_oldest(rdev)) { | |
962 | kfree(new); | |
963 | goto drop; | |
964 | } | |
965 | ||
1b8ec87a | 966 | list_add_tail(&new->list, &rdev->bss_list); |
9853a55e | 967 | rdev->bss_entries++; |
1b8ec87a | 968 | rb_insert_bss(rdev, new); |
9caf0364 | 969 | found = new; |
2a519311 JB |
970 | } |
971 | ||
1b8ec87a ZG |
972 | rdev->bss_generation++; |
973 | bss_ref_get(rdev, found); | |
974 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 | 975 | |
2a519311 | 976 | return found; |
776b3580 | 977 | drop: |
1b8ec87a | 978 | spin_unlock_bh(&rdev->bss_lock); |
776b3580 | 979 | return NULL; |
2a519311 JB |
980 | } |
981 | ||
0172bb75 JB |
982 | static struct ieee80211_channel * |
983 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
984 | struct ieee80211_channel *channel) | |
985 | { | |
986 | const u8 *tmp; | |
987 | u32 freq; | |
988 | int channel_number = -1; | |
989 | ||
990 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
991 | if (tmp && tmp[1] == 1) { | |
992 | channel_number = tmp[2]; | |
993 | } else { | |
994 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
995 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
996 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
997 | ||
998 | channel_number = htop->primary_chan; | |
999 | } | |
1000 | } | |
1001 | ||
1002 | if (channel_number < 0) | |
1003 | return channel; | |
1004 | ||
1005 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
1006 | channel = ieee80211_get_channel(wiphy, freq); | |
1007 | if (!channel) | |
1008 | return NULL; | |
1009 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
1010 | return NULL; | |
1011 | return channel; | |
1012 | } | |
1013 | ||
0e3a39b5 | 1014 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
6e19bc4b DS |
1015 | struct cfg80211_bss * |
1016 | cfg80211_inform_bss_data(struct wiphy *wiphy, | |
1017 | struct cfg80211_inform_bss *data, | |
1018 | enum cfg80211_bss_frame_type ftype, | |
1019 | const u8 *bssid, u64 tsf, u16 capability, | |
1020 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
1021 | gfp_t gfp) | |
06aa7afa | 1022 | { |
9caf0364 | 1023 | struct cfg80211_bss_ies *ies; |
3afc2167 | 1024 | struct ieee80211_channel *channel; |
9caf0364 | 1025 | struct cfg80211_internal_bss tmp = {}, *res; |
6eb18137 | 1026 | int bss_type; |
67af9811 | 1027 | bool signal_valid; |
06aa7afa JK |
1028 | |
1029 | if (WARN_ON(!wiphy)) | |
1030 | return NULL; | |
1031 | ||
22fe88d3 | 1032 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1033 | (data->signal < 0 || data->signal > 100))) |
06aa7afa JK |
1034 | return NULL; |
1035 | ||
6e19bc4b | 1036 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan); |
0172bb75 JB |
1037 | if (!channel) |
1038 | return NULL; | |
1039 | ||
9caf0364 JB |
1040 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
1041 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1042 | tmp.pub.scan_width = data->scan_width; |
1043 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1044 | tmp.pub.beacon_interval = beacon_interval; |
1045 | tmp.pub.capability = capability; | |
6e19bc4b DS |
1046 | tmp.ts_boottime = data->boottime_ns; |
1047 | ||
34a6eddb | 1048 | /* |
5bc8c1f2 | 1049 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
1050 | * Response frame, we need to pick one of the options and only use it |
1051 | * with the driver that does not provide the full Beacon/Probe Response | |
1052 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 1053 | * override the IEs pointer should we have received an earlier |
9caf0364 | 1054 | * indication of Probe Response data. |
34a6eddb | 1055 | */ |
0e227084 | 1056 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 JB |
1057 | if (!ies) |
1058 | return NULL; | |
1059 | ies->len = ielen; | |
8cef2c9d | 1060 | ies->tsf = tsf; |
0e227084 | 1061 | ies->from_beacon = false; |
9caf0364 | 1062 | memcpy(ies->data, ie, ielen); |
06aa7afa | 1063 | |
5bc8c1f2 JB |
1064 | switch (ftype) { |
1065 | case CFG80211_BSS_FTYPE_BEACON: | |
1066 | ies->from_beacon = true; | |
1067 | /* fall through to assign */ | |
1068 | case CFG80211_BSS_FTYPE_UNKNOWN: | |
1069 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1070 | break; | |
1071 | case CFG80211_BSS_FTYPE_PRESP: | |
1072 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1073 | break; | |
1074 | } | |
9caf0364 | 1075 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 1076 | |
6e19bc4b | 1077 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1078 | wiphy->max_adj_channel_rssi_comp; |
1079 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
06aa7afa JK |
1080 | if (!res) |
1081 | return NULL; | |
1082 | ||
57fbcce3 | 1083 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1084 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1085 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1086 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1087 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1088 | } else { | |
1089 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1090 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1091 | } | |
06aa7afa | 1092 | |
4ee3e063 | 1093 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
1094 | /* cfg80211_bss_update gives us a referenced result */ |
1095 | return &res->pub; | |
1096 | } | |
6e19bc4b | 1097 | EXPORT_SYMBOL(cfg80211_inform_bss_data); |
06aa7afa | 1098 | |
6e19bc4b | 1099 | /* cfg80211_inform_bss_width_frame helper */ |
2a519311 | 1100 | struct cfg80211_bss * |
6e19bc4b DS |
1101 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, |
1102 | struct cfg80211_inform_bss *data, | |
1103 | struct ieee80211_mgmt *mgmt, size_t len, | |
1104 | gfp_t gfp) | |
1105 | ||
2a519311 | 1106 | { |
9caf0364 JB |
1107 | struct cfg80211_internal_bss tmp = {}, *res; |
1108 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 1109 | struct ieee80211_channel *channel; |
67af9811 | 1110 | bool signal_valid; |
2a519311 JB |
1111 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
1112 | u.probe_resp.variable); | |
6eb18137 | 1113 | int bss_type; |
bef9bacc | 1114 | |
0172bb75 JB |
1115 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
1116 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
1117 | ||
6e19bc4b | 1118 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
4ee3e063 | 1119 | |
bef9bacc MK |
1120 | if (WARN_ON(!mgmt)) |
1121 | return NULL; | |
1122 | ||
1123 | if (WARN_ON(!wiphy)) | |
1124 | return NULL; | |
2a519311 | 1125 | |
22fe88d3 | 1126 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1127 | (data->signal < 0 || data->signal > 100))) |
2a519311 JB |
1128 | return NULL; |
1129 | ||
bef9bacc | 1130 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
1131 | return NULL; |
1132 | ||
0172bb75 | 1133 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
6e19bc4b | 1134 | ielen, data->chan); |
0172bb75 JB |
1135 | if (!channel) |
1136 | return NULL; | |
1137 | ||
0e227084 | 1138 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 1139 | if (!ies) |
2a519311 | 1140 | return NULL; |
9caf0364 | 1141 | ies->len = ielen; |
8cef2c9d | 1142 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
0e227084 | 1143 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); |
9caf0364 | 1144 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
2a519311 | 1145 | |
9caf0364 JB |
1146 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
1147 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1148 | else | |
1149 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1150 | rcu_assign_pointer(tmp.pub.ies, ies); | |
505a2e88 | 1151 | |
9caf0364 JB |
1152 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); |
1153 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1154 | tmp.pub.scan_width = data->scan_width; |
1155 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1156 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
1157 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
6e19bc4b | 1158 | tmp.ts_boottime = data->boottime_ns; |
1d76250b AS |
1159 | tmp.parent_tsf = data->parent_tsf; |
1160 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); | |
9caf0364 | 1161 | |
6e19bc4b | 1162 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1163 | wiphy->max_adj_channel_rssi_comp; |
1164 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
2a519311 JB |
1165 | if (!res) |
1166 | return NULL; | |
1167 | ||
57fbcce3 | 1168 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1169 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1170 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1171 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1172 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1173 | } else { | |
1174 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1175 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1176 | } | |
e38f8a7a | 1177 | |
4ee3e063 | 1178 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1179 | /* cfg80211_bss_update gives us a referenced result */ |
1180 | return &res->pub; | |
1181 | } | |
6e19bc4b | 1182 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 1183 | |
5b112d3d | 1184 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 1185 | { |
f26cbf40 | 1186 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
1187 | struct cfg80211_internal_bss *bss; |
1188 | ||
1189 | if (!pub) | |
1190 | return; | |
1191 | ||
1192 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1193 | |
1b8ec87a ZG |
1194 | spin_lock_bh(&rdev->bss_lock); |
1195 | bss_ref_get(rdev, bss); | |
1196 | spin_unlock_bh(&rdev->bss_lock); | |
4c0c0b75 JB |
1197 | } |
1198 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
1199 | ||
5b112d3d | 1200 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 1201 | { |
f26cbf40 | 1202 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
1203 | struct cfg80211_internal_bss *bss; |
1204 | ||
1205 | if (!pub) | |
1206 | return; | |
1207 | ||
1208 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1209 | |
1b8ec87a ZG |
1210 | spin_lock_bh(&rdev->bss_lock); |
1211 | bss_ref_put(rdev, bss); | |
1212 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 JB |
1213 | } |
1214 | EXPORT_SYMBOL(cfg80211_put_bss); | |
1215 | ||
d491af19 JB |
1216 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1217 | { | |
f26cbf40 | 1218 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
d491af19 JB |
1219 | struct cfg80211_internal_bss *bss; |
1220 | ||
1221 | if (WARN_ON(!pub)) | |
1222 | return; | |
1223 | ||
1224 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
1225 | ||
1b8ec87a | 1226 | spin_lock_bh(&rdev->bss_lock); |
3207390a | 1227 | if (!list_empty(&bss->list)) { |
1b8ec87a ZG |
1228 | if (__cfg80211_unlink_bss(rdev, bss)) |
1229 | rdev->bss_generation++; | |
3207390a | 1230 | } |
1b8ec87a | 1231 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
1232 | } |
1233 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
1234 | ||
3d23e349 | 1235 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
1236 | static struct cfg80211_registered_device * |
1237 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
1238 | { | |
5fe231e8 | 1239 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
1240 | struct net_device *dev; |
1241 | ||
5fe231e8 JB |
1242 | ASSERT_RTNL(); |
1243 | ||
9f419f38 JB |
1244 | dev = dev_get_by_index(net, ifindex); |
1245 | if (!dev) | |
5fe231e8 JB |
1246 | return ERR_PTR(-ENODEV); |
1247 | if (dev->ieee80211_ptr) | |
f26cbf40 | 1248 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 1249 | else |
9f419f38 JB |
1250 | rdev = ERR_PTR(-ENODEV); |
1251 | dev_put(dev); | |
9f419f38 JB |
1252 | return rdev; |
1253 | } | |
1254 | ||
2a519311 JB |
1255 | int cfg80211_wext_siwscan(struct net_device *dev, |
1256 | struct iw_request_info *info, | |
1257 | union iwreq_data *wrqu, char *extra) | |
1258 | { | |
1259 | struct cfg80211_registered_device *rdev; | |
1260 | struct wiphy *wiphy; | |
1261 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 1262 | struct cfg80211_scan_request *creq = NULL; |
2a519311 | 1263 | int i, err, n_channels = 0; |
57fbcce3 | 1264 | enum nl80211_band band; |
2a519311 JB |
1265 | |
1266 | if (!netif_running(dev)) | |
1267 | return -ENETDOWN; | |
1268 | ||
b2e3abdc HS |
1269 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
1270 | wreq = (struct iw_scan_req *)extra; | |
1271 | ||
463d0183 | 1272 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1273 | |
1274 | if (IS_ERR(rdev)) | |
1275 | return PTR_ERR(rdev); | |
1276 | ||
f9d15d16 | 1277 | if (rdev->scan_req || rdev->scan_msg) { |
2a519311 JB |
1278 | err = -EBUSY; |
1279 | goto out; | |
1280 | } | |
1281 | ||
1282 | wiphy = &rdev->wiphy; | |
1283 | ||
b2e3abdc HS |
1284 | /* Determine number of channels, needed to allocate creq */ |
1285 | if (wreq && wreq->num_channels) | |
1286 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
1287 | else |
1288 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
1289 | |
1290 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1291 | n_channels * sizeof(void *), | |
1292 | GFP_ATOMIC); | |
1293 | if (!creq) { | |
1294 | err = -ENOMEM; | |
1295 | goto out; | |
1296 | } | |
1297 | ||
1298 | creq->wiphy = wiphy; | |
fd014284 | 1299 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1300 | /* SSIDs come after channels */ |
1301 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1302 | creq->n_channels = n_channels; |
1303 | creq->n_ssids = 1; | |
15d6030b | 1304 | creq->scan_start = jiffies; |
2a519311 | 1305 | |
b2e3abdc | 1306 | /* translate "Scan on frequencies" request */ |
2a519311 | 1307 | i = 0; |
57fbcce3 | 1308 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
2a519311 | 1309 | int j; |
584991dc | 1310 | |
2a519311 JB |
1311 | if (!wiphy->bands[band]) |
1312 | continue; | |
584991dc | 1313 | |
2a519311 | 1314 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1315 | /* ignore disabled channels */ |
1316 | if (wiphy->bands[band]->channels[j].flags & | |
1317 | IEEE80211_CHAN_DISABLED) | |
1318 | continue; | |
b2e3abdc HS |
1319 | |
1320 | /* If we have a wireless request structure and the | |
1321 | * wireless request specifies frequencies, then search | |
1322 | * for the matching hardware channel. | |
1323 | */ | |
1324 | if (wreq && wreq->num_channels) { | |
1325 | int k; | |
1326 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1327 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
1328 | struct iw_freq *freq = |
1329 | &wreq->channel_list[k]; | |
1330 | int wext_freq = | |
1331 | cfg80211_wext_freq(freq); | |
1332 | ||
b2e3abdc HS |
1333 | if (wext_freq == wiphy_freq) |
1334 | goto wext_freq_found; | |
1335 | } | |
1336 | goto wext_freq_not_found; | |
1337 | } | |
1338 | ||
1339 | wext_freq_found: | |
2a519311 JB |
1340 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1341 | i++; | |
b2e3abdc | 1342 | wext_freq_not_found: ; |
2a519311 JB |
1343 | } |
1344 | } | |
8862dc5f HS |
1345 | /* No channels found? */ |
1346 | if (!i) { | |
1347 | err = -EINVAL; | |
1348 | goto out; | |
1349 | } | |
2a519311 | 1350 | |
b2e3abdc HS |
1351 | /* Set real number of channels specified in creq->channels[] */ |
1352 | creq->n_channels = i; | |
2a519311 | 1353 | |
b2e3abdc HS |
1354 | /* translate "Scan for SSID" request */ |
1355 | if (wreq) { | |
2a519311 | 1356 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1357 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1358 | err = -EINVAL; | |
1359 | goto out; | |
1360 | } | |
2a519311 JB |
1361 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1362 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1363 | } | |
1364 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1365 | creq->n_ssids = 0; | |
1366 | } | |
1367 | ||
57fbcce3 | 1368 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
a401d2bb JB |
1369 | if (wiphy->bands[i]) |
1370 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1371 | |
818965d3 JM |
1372 | eth_broadcast_addr(creq->bssid); |
1373 | ||
2a519311 | 1374 | rdev->scan_req = creq; |
e35e4d28 | 1375 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1376 | if (err) { |
1377 | rdev->scan_req = NULL; | |
65486c8b | 1378 | /* creq will be freed below */ |
463d0183 | 1379 | } else { |
fd014284 | 1380 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1381 | /* creq now owned by driver */ |
1382 | creq = NULL; | |
463d0183 JB |
1383 | dev_hold(dev); |
1384 | } | |
2a519311 | 1385 | out: |
65486c8b | 1386 | kfree(creq); |
2a519311 JB |
1387 | return err; |
1388 | } | |
2afe38d1 | 1389 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 1390 | |
76a70e9c JM |
1391 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
1392 | const struct cfg80211_bss_ies *ies, | |
1393 | char *current_ev, char *end_buf) | |
2a519311 | 1394 | { |
9caf0364 | 1395 | const u8 *pos, *end, *next; |
2a519311 JB |
1396 | struct iw_event iwe; |
1397 | ||
9caf0364 | 1398 | if (!ies) |
76a70e9c | 1399 | return current_ev; |
2a519311 JB |
1400 | |
1401 | /* | |
1402 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1403 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1404 | */ | |
9caf0364 JB |
1405 | pos = ies->data; |
1406 | end = pos + ies->len; | |
2a519311 JB |
1407 | |
1408 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1409 | next = pos + 2 + pos[1]; | |
1410 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1411 | next = next + 2 + next[1]; | |
1412 | ||
1413 | memset(&iwe, 0, sizeof(iwe)); | |
1414 | iwe.cmd = IWEVGENIE; | |
1415 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
1416 | current_ev = iwe_stream_add_point_check(info, current_ev, |
1417 | end_buf, &iwe, | |
1418 | (void *)pos); | |
1419 | if (IS_ERR(current_ev)) | |
1420 | return current_ev; | |
2a519311 JB |
1421 | pos = next; |
1422 | } | |
1423 | ||
1424 | if (end > pos) { | |
1425 | memset(&iwe, 0, sizeof(iwe)); | |
1426 | iwe.cmd = IWEVGENIE; | |
1427 | iwe.u.data.length = end - pos; | |
76a70e9c JM |
1428 | current_ev = iwe_stream_add_point_check(info, current_ev, |
1429 | end_buf, &iwe, | |
1430 | (void *)pos); | |
1431 | if (IS_ERR(current_ev)) | |
1432 | return current_ev; | |
2a519311 | 1433 | } |
76a70e9c JM |
1434 | |
1435 | return current_ev; | |
2a519311 JB |
1436 | } |
1437 | ||
2a519311 | 1438 | static char * |
77965c97 JB |
1439 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1440 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1441 | char *end_buf) | |
2a519311 | 1442 | { |
9caf0364 | 1443 | const struct cfg80211_bss_ies *ies; |
2a519311 | 1444 | struct iw_event iwe; |
9caf0364 | 1445 | const u8 *ie; |
76a70e9c JM |
1446 | u8 buf[50]; |
1447 | u8 *cfg, *p, *tmp; | |
9caf0364 | 1448 | int rem, i, sig; |
2a519311 JB |
1449 | bool ismesh = false; |
1450 | ||
1451 | memset(&iwe, 0, sizeof(iwe)); | |
1452 | iwe.cmd = SIOCGIWAP; | |
1453 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1454 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
1455 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1456 | IW_EV_ADDR_LEN); | |
1457 | if (IS_ERR(current_ev)) | |
1458 | return current_ev; | |
2a519311 JB |
1459 | |
1460 | memset(&iwe, 0, sizeof(iwe)); | |
1461 | iwe.cmd = SIOCGIWFREQ; | |
1462 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1463 | iwe.u.freq.e = 0; | |
76a70e9c JM |
1464 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1465 | IW_EV_FREQ_LEN); | |
1466 | if (IS_ERR(current_ev)) | |
1467 | return current_ev; | |
2a519311 JB |
1468 | |
1469 | memset(&iwe, 0, sizeof(iwe)); | |
1470 | iwe.cmd = SIOCGIWFREQ; | |
1471 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1472 | iwe.u.freq.e = 6; | |
76a70e9c JM |
1473 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1474 | IW_EV_FREQ_LEN); | |
1475 | if (IS_ERR(current_ev)) | |
1476 | return current_ev; | |
2a519311 | 1477 | |
77965c97 | 1478 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1479 | memset(&iwe, 0, sizeof(iwe)); |
1480 | iwe.cmd = IWEVQUAL; | |
1481 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1482 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1483 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1484 | switch (wiphy->signal_type) { |
2a519311 | 1485 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1486 | sig = bss->pub.signal / 100; |
1487 | iwe.u.qual.level = sig; | |
2a519311 | 1488 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1489 | if (sig < -110) /* rather bad */ |
1490 | sig = -110; | |
1491 | else if (sig > -40) /* perfect */ | |
1492 | sig = -40; | |
1493 | /* will give a range of 0 .. 70 */ | |
1494 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1495 | break; |
1496 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1497 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1498 | /* will give range 0 .. 100 */ |
1499 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1500 | break; |
1501 | default: | |
1502 | /* not reached */ | |
1503 | break; | |
1504 | } | |
76a70e9c JM |
1505 | current_ev = iwe_stream_add_event_check(info, current_ev, |
1506 | end_buf, &iwe, | |
1507 | IW_EV_QUAL_LEN); | |
1508 | if (IS_ERR(current_ev)) | |
1509 | return current_ev; | |
2a519311 JB |
1510 | } |
1511 | ||
1512 | memset(&iwe, 0, sizeof(iwe)); | |
1513 | iwe.cmd = SIOCGIWENCODE; | |
1514 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1515 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1516 | else | |
1517 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1518 | iwe.u.data.length = 0; | |
76a70e9c JM |
1519 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
1520 | &iwe, ""); | |
1521 | if (IS_ERR(current_ev)) | |
1522 | return current_ev; | |
2a519311 | 1523 | |
9caf0364 JB |
1524 | rcu_read_lock(); |
1525 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
1526 | rem = ies->len; |
1527 | ie = ies->data; | |
9caf0364 | 1528 | |
83c7aa1a | 1529 | while (rem >= 2) { |
2a519311 JB |
1530 | /* invalid data */ |
1531 | if (ie[1] > rem - 2) | |
1532 | break; | |
1533 | ||
1534 | switch (ie[0]) { | |
1535 | case WLAN_EID_SSID: | |
1536 | memset(&iwe, 0, sizeof(iwe)); | |
1537 | iwe.cmd = SIOCGIWESSID; | |
1538 | iwe.u.data.length = ie[1]; | |
1539 | iwe.u.data.flags = 1; | |
76a70e9c JM |
1540 | current_ev = iwe_stream_add_point_check(info, |
1541 | current_ev, | |
1542 | end_buf, &iwe, | |
1543 | (u8 *)ie + 2); | |
1544 | if (IS_ERR(current_ev)) | |
1545 | goto unlock; | |
2a519311 JB |
1546 | break; |
1547 | case WLAN_EID_MESH_ID: | |
1548 | memset(&iwe, 0, sizeof(iwe)); | |
1549 | iwe.cmd = SIOCGIWESSID; | |
1550 | iwe.u.data.length = ie[1]; | |
1551 | iwe.u.data.flags = 1; | |
76a70e9c JM |
1552 | current_ev = iwe_stream_add_point_check(info, |
1553 | current_ev, | |
1554 | end_buf, &iwe, | |
1555 | (u8 *)ie + 2); | |
1556 | if (IS_ERR(current_ev)) | |
1557 | goto unlock; | |
2a519311 JB |
1558 | break; |
1559 | case WLAN_EID_MESH_CONFIG: | |
1560 | ismesh = true; | |
136cfa28 | 1561 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 1562 | break; |
9caf0364 | 1563 | cfg = (u8 *)ie + 2; |
2a519311 JB |
1564 | memset(&iwe, 0, sizeof(iwe)); |
1565 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1566 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1567 | "0x%02X", cfg[0]); | |
2a519311 | 1568 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1569 | current_ev = iwe_stream_add_point_check(info, |
1570 | current_ev, | |
1571 | end_buf, | |
1572 | &iwe, buf); | |
1573 | if (IS_ERR(current_ev)) | |
1574 | goto unlock; | |
76aa5e70 RP |
1575 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1576 | cfg[1]); | |
2a519311 | 1577 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1578 | current_ev = iwe_stream_add_point_check(info, |
1579 | current_ev, | |
1580 | end_buf, | |
1581 | &iwe, buf); | |
1582 | if (IS_ERR(current_ev)) | |
1583 | goto unlock; | |
76aa5e70 RP |
1584 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1585 | cfg[2]); | |
2a519311 | 1586 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1587 | current_ev = iwe_stream_add_point_check(info, |
1588 | current_ev, | |
1589 | end_buf, | |
1590 | &iwe, buf); | |
1591 | if (IS_ERR(current_ev)) | |
1592 | goto unlock; | |
76aa5e70 | 1593 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 | 1594 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1595 | current_ev = iwe_stream_add_point_check(info, |
1596 | current_ev, | |
1597 | end_buf, | |
1598 | &iwe, buf); | |
1599 | if (IS_ERR(current_ev)) | |
1600 | goto unlock; | |
76aa5e70 RP |
1601 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1602 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
1603 | current_ev = iwe_stream_add_point_check(info, |
1604 | current_ev, | |
1605 | end_buf, | |
1606 | &iwe, buf); | |
1607 | if (IS_ERR(current_ev)) | |
1608 | goto unlock; | |
76aa5e70 RP |
1609 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
1610 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
1611 | current_ev = iwe_stream_add_point_check(info, |
1612 | current_ev, | |
1613 | end_buf, | |
1614 | &iwe, buf); | |
1615 | if (IS_ERR(current_ev)) | |
1616 | goto unlock; | |
76aa5e70 | 1617 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
2a519311 | 1618 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1619 | current_ev = iwe_stream_add_point_check(info, |
1620 | current_ev, | |
1621 | end_buf, | |
1622 | &iwe, buf); | |
1623 | if (IS_ERR(current_ev)) | |
1624 | goto unlock; | |
2a519311 JB |
1625 | break; |
1626 | case WLAN_EID_SUPP_RATES: | |
1627 | case WLAN_EID_EXT_SUPP_RATES: | |
1628 | /* display all supported rates in readable format */ | |
1629 | p = current_ev + iwe_stream_lcp_len(info); | |
1630 | ||
1631 | memset(&iwe, 0, sizeof(iwe)); | |
1632 | iwe.cmd = SIOCGIWRATE; | |
1633 | /* Those two flags are ignored... */ | |
1634 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1635 | ||
1636 | for (i = 0; i < ie[1]; i++) { | |
1637 | iwe.u.bitrate.value = | |
1638 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 1639 | tmp = p; |
2a519311 | 1640 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
1641 | end_buf, &iwe, |
1642 | IW_EV_PARAM_LEN); | |
1643 | if (p == tmp) { | |
1644 | current_ev = ERR_PTR(-E2BIG); | |
1645 | goto unlock; | |
1646 | } | |
2a519311 JB |
1647 | } |
1648 | current_ev = p; | |
1649 | break; | |
1650 | } | |
1651 | rem -= ie[1] + 2; | |
1652 | ie += ie[1] + 2; | |
1653 | } | |
1654 | ||
f64f9e71 JP |
1655 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1656 | ismesh) { | |
2a519311 JB |
1657 | memset(&iwe, 0, sizeof(iwe)); |
1658 | iwe.cmd = SIOCGIWMODE; | |
1659 | if (ismesh) | |
1660 | iwe.u.mode = IW_MODE_MESH; | |
1661 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1662 | iwe.u.mode = IW_MODE_MASTER; | |
1663 | else | |
1664 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
1665 | current_ev = iwe_stream_add_event_check(info, current_ev, |
1666 | end_buf, &iwe, | |
1667 | IW_EV_UINT_LEN); | |
1668 | if (IS_ERR(current_ev)) | |
1669 | goto unlock; | |
2a519311 JB |
1670 | } |
1671 | ||
76a70e9c JM |
1672 | memset(&iwe, 0, sizeof(iwe)); |
1673 | iwe.cmd = IWEVCUSTOM; | |
1674 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); | |
1675 | iwe.u.data.length = strlen(buf); | |
1676 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, | |
1677 | &iwe, buf); | |
1678 | if (IS_ERR(current_ev)) | |
1679 | goto unlock; | |
1680 | memset(&iwe, 0, sizeof(iwe)); | |
1681 | iwe.cmd = IWEVCUSTOM; | |
1682 | sprintf(buf, " Last beacon: %ums ago", | |
1683 | elapsed_jiffies_msecs(bss->ts)); | |
1684 | iwe.u.data.length = strlen(buf); | |
1685 | current_ev = iwe_stream_add_point_check(info, current_ev, | |
1686 | end_buf, &iwe, buf); | |
1687 | if (IS_ERR(current_ev)) | |
1688 | goto unlock; | |
1689 | ||
1690 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
1691 | ||
1692 | unlock: | |
9caf0364 | 1693 | rcu_read_unlock(); |
2a519311 JB |
1694 | return current_ev; |
1695 | } | |
1696 | ||
1697 | ||
1b8ec87a | 1698 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
1699 | struct iw_request_info *info, |
1700 | char *buf, size_t len) | |
1701 | { | |
1702 | char *current_ev = buf; | |
1703 | char *end_buf = buf + len; | |
1704 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 1705 | int err = 0; |
2a519311 | 1706 | |
1b8ec87a ZG |
1707 | spin_lock_bh(&rdev->bss_lock); |
1708 | cfg80211_bss_expire(rdev); | |
2a519311 | 1709 | |
1b8ec87a | 1710 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 1711 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
1712 | err = -E2BIG; |
1713 | break; | |
2a519311 | 1714 | } |
1b8ec87a | 1715 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 1716 | current_ev, end_buf); |
76a70e9c JM |
1717 | if (IS_ERR(current_ev)) { |
1718 | err = PTR_ERR(current_ev); | |
1719 | break; | |
1720 | } | |
2a519311 | 1721 | } |
1b8ec87a | 1722 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
1723 | |
1724 | if (err) | |
1725 | return err; | |
2a519311 JB |
1726 | return current_ev - buf; |
1727 | } | |
1728 | ||
1729 | ||
1730 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1731 | struct iw_request_info *info, | |
1732 | struct iw_point *data, char *extra) | |
1733 | { | |
1734 | struct cfg80211_registered_device *rdev; | |
1735 | int res; | |
1736 | ||
1737 | if (!netif_running(dev)) | |
1738 | return -ENETDOWN; | |
1739 | ||
463d0183 | 1740 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1741 | |
1742 | if (IS_ERR(rdev)) | |
1743 | return PTR_ERR(rdev); | |
1744 | ||
f9d15d16 | 1745 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 1746 | return -EAGAIN; |
2a519311 JB |
1747 | |
1748 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1749 | data->length = 0; | |
1750 | if (res >= 0) { | |
1751 | data->length = res; | |
1752 | res = 0; | |
1753 | } | |
1754 | ||
2a519311 JB |
1755 | return res; |
1756 | } | |
2afe38d1 | 1757 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 1758 | #endif |