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 | ||
f9616e0f | 60 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 61 | |
776b3580 | 62 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 63 | { |
9caf0364 | 64 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
65 | |
66 | if (WARN_ON(atomic_read(&bss->hold))) | |
67 | return; | |
68 | ||
9caf0364 | 69 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 70 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
71 | kfree_rcu(ies, rcu_head); |
72 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
73 | if (ies) | |
74 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 75 | |
776b3580 JB |
76 | /* |
77 | * This happens when the module is removed, it doesn't | |
78 | * really matter any more save for completeness | |
79 | */ | |
80 | if (!list_empty(&bss->hidden_list)) | |
81 | list_del(&bss->hidden_list); | |
82 | ||
e8e27c66 AK |
83 | kfree(bss); |
84 | } | |
85 | ||
1b8ec87a | 86 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
776b3580 | 87 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 88 | { |
1b8ec87a | 89 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
90 | |
91 | bss->refcount++; | |
92 | if (bss->pub.hidden_beacon_bss) { | |
93 | bss = container_of(bss->pub.hidden_beacon_bss, | |
94 | struct cfg80211_internal_bss, | |
95 | pub); | |
96 | bss->refcount++; | |
97 | } | |
0532d4f1 JB |
98 | } |
99 | ||
1b8ec87a | 100 | static inline void bss_ref_put(struct cfg80211_registered_device *rdev, |
776b3580 | 101 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 102 | { |
1b8ec87a | 103 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
104 | |
105 | if (bss->pub.hidden_beacon_bss) { | |
106 | struct cfg80211_internal_bss *hbss; | |
107 | hbss = container_of(bss->pub.hidden_beacon_bss, | |
108 | struct cfg80211_internal_bss, | |
109 | pub); | |
110 | hbss->refcount--; | |
111 | if (hbss->refcount == 0) | |
112 | bss_free(hbss); | |
113 | } | |
114 | bss->refcount--; | |
115 | if (bss->refcount == 0) | |
116 | bss_free(bss); | |
0532d4f1 JB |
117 | } |
118 | ||
1b8ec87a | 119 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
120 | struct cfg80211_internal_bss *bss) |
121 | { | |
1b8ec87a | 122 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 123 | |
776b3580 JB |
124 | if (!list_empty(&bss->hidden_list)) { |
125 | /* | |
126 | * don't remove the beacon entry if it has | |
127 | * probe responses associated with it | |
128 | */ | |
129 | if (!bss->pub.hidden_beacon_bss) | |
130 | return false; | |
131 | /* | |
132 | * if it's a probe response entry break its | |
133 | * link to the other entries in the group | |
134 | */ | |
135 | list_del_init(&bss->hidden_list); | |
136 | } | |
137 | ||
e8e27c66 | 138 | list_del_init(&bss->list); |
1b8ec87a ZG |
139 | rb_erase(&bss->rbn, &rdev->bss_tree); |
140 | bss_ref_put(rdev, bss); | |
776b3580 | 141 | return true; |
e8e27c66 AK |
142 | } |
143 | ||
1b8ec87a | 144 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
145 | unsigned long expire_time) |
146 | { | |
147 | struct cfg80211_internal_bss *bss, *tmp; | |
148 | bool expired = false; | |
149 | ||
1b8ec87a | 150 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 151 | |
1b8ec87a | 152 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
153 | if (atomic_read(&bss->hold)) |
154 | continue; | |
155 | if (!time_after(expire_time, bss->ts)) | |
156 | continue; | |
157 | ||
1b8ec87a | 158 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 159 | expired = true; |
15d6030b SL |
160 | } |
161 | ||
162 | if (expired) | |
1b8ec87a | 163 | rdev->bss_generation++; |
15d6030b SL |
164 | } |
165 | ||
f9d15d16 JB |
166 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
167 | bool send_message) | |
2a519311 | 168 | { |
667503dd | 169 | struct cfg80211_scan_request *request; |
fd014284 | 170 | struct wireless_dev *wdev; |
f9d15d16 | 171 | struct sk_buff *msg; |
3d23e349 | 172 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
173 | union iwreq_data wrqu; |
174 | #endif | |
175 | ||
5fe231e8 | 176 | ASSERT_RTNL(); |
01a0ac41 | 177 | |
f9d15d16 JB |
178 | if (rdev->scan_msg) { |
179 | nl80211_send_scan_result(rdev, rdev->scan_msg); | |
180 | rdev->scan_msg = NULL; | |
181 | return; | |
182 | } | |
667503dd | 183 | |
f9d15d16 | 184 | request = rdev->scan_req; |
01a0ac41 JB |
185 | if (!request) |
186 | return; | |
187 | ||
fd014284 | 188 | wdev = request->wdev; |
2a519311 | 189 | |
6829c878 JB |
190 | /* |
191 | * This must be before sending the other events! | |
192 | * Otherwise, wpa_supplicant gets completely confused with | |
193 | * wext events. | |
194 | */ | |
fd014284 JB |
195 | if (wdev->netdev) |
196 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 197 | |
1d76250b | 198 | if (!request->info.aborted && |
f9d15d16 JB |
199 | request->flags & NL80211_SCAN_FLAG_FLUSH) { |
200 | /* flush entries from previous scans */ | |
201 | spin_lock_bh(&rdev->bss_lock); | |
202 | __cfg80211_bss_expire(rdev, request->scan_start); | |
203 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 204 | } |
2a519311 | 205 | |
1d76250b | 206 | msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); |
f9d15d16 | 207 | |
3d23e349 | 208 | #ifdef CONFIG_CFG80211_WEXT |
1d76250b | 209 | if (wdev->netdev && !request->info.aborted) { |
2a519311 JB |
210 | memset(&wrqu, 0, sizeof(wrqu)); |
211 | ||
fd014284 | 212 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
213 | } |
214 | #endif | |
215 | ||
fd014284 JB |
216 | if (wdev->netdev) |
217 | dev_put(wdev->netdev); | |
2a519311 | 218 | |
36e6fea8 | 219 | rdev->scan_req = NULL; |
4a58e7c3 | 220 | kfree(request); |
f9d15d16 JB |
221 | |
222 | if (!send_message) | |
223 | rdev->scan_msg = msg; | |
224 | else | |
225 | nl80211_send_scan_result(rdev, msg); | |
2a519311 | 226 | } |
667503dd | 227 | |
36e6fea8 JB |
228 | void __cfg80211_scan_done(struct work_struct *wk) |
229 | { | |
230 | struct cfg80211_registered_device *rdev; | |
231 | ||
232 | rdev = container_of(wk, struct cfg80211_registered_device, | |
233 | scan_done_wk); | |
234 | ||
5fe231e8 | 235 | rtnl_lock(); |
f9d15d16 | 236 | ___cfg80211_scan_done(rdev, true); |
5fe231e8 | 237 | rtnl_unlock(); |
36e6fea8 JB |
238 | } |
239 | ||
1d76250b AS |
240 | void cfg80211_scan_done(struct cfg80211_scan_request *request, |
241 | struct cfg80211_scan_info *info) | |
667503dd | 242 | { |
1d76250b | 243 | trace_cfg80211_scan_done(request, info); |
f26cbf40 | 244 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req); |
667503dd | 245 | |
1d76250b | 246 | request->info = *info; |
5fe231e8 | 247 | request->notified = true; |
f26cbf40 | 248 | queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); |
667503dd | 249 | } |
2a519311 JB |
250 | EXPORT_SYMBOL(cfg80211_scan_done); |
251 | ||
807f8a8c LC |
252 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
253 | { | |
254 | struct cfg80211_registered_device *rdev; | |
15d6030b | 255 | struct cfg80211_sched_scan_request *request; |
807f8a8c LC |
256 | |
257 | rdev = container_of(wk, struct cfg80211_registered_device, | |
258 | sched_scan_results_wk); | |
259 | ||
5fe231e8 | 260 | rtnl_lock(); |
807f8a8c | 261 | |
31a60ed1 | 262 | request = rtnl_dereference(rdev->sched_scan_req); |
79845c66 | 263 | |
807f8a8c | 264 | /* we don't have sched_scan_req anymore if the scan is stopping */ |
15d6030b SL |
265 | if (request) { |
266 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
267 | /* flush entries from previous scans */ | |
268 | spin_lock_bh(&rdev->bss_lock); | |
269 | __cfg80211_bss_expire(rdev, request->scan_start); | |
270 | spin_unlock_bh(&rdev->bss_lock); | |
3b06d277 | 271 | request->scan_start = jiffies; |
15d6030b SL |
272 | } |
273 | nl80211_send_sched_scan_results(rdev, request->dev); | |
274 | } | |
807f8a8c | 275 | |
5fe231e8 | 276 | rtnl_unlock(); |
807f8a8c LC |
277 | } |
278 | ||
279 | void cfg80211_sched_scan_results(struct wiphy *wiphy) | |
280 | { | |
4ee3e063 | 281 | trace_cfg80211_sched_scan_results(wiphy); |
807f8a8c | 282 | /* ignore if we're not scanning */ |
31a60ed1 JR |
283 | |
284 | if (rcu_access_pointer(wiphy_to_rdev(wiphy)->sched_scan_req)) | |
807f8a8c | 285 | queue_work(cfg80211_wq, |
f26cbf40 | 286 | &wiphy_to_rdev(wiphy)->sched_scan_results_wk); |
807f8a8c LC |
287 | } |
288 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
289 | ||
792e6aa7 | 290 | void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy) |
807f8a8c | 291 | { |
f26cbf40 | 292 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 293 | |
792e6aa7 EP |
294 | ASSERT_RTNL(); |
295 | ||
4ee3e063 BL |
296 | trace_cfg80211_sched_scan_stopped(wiphy); |
297 | ||
807f8a8c | 298 | __cfg80211_stop_sched_scan(rdev, true); |
792e6aa7 EP |
299 | } |
300 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl); | |
301 | ||
302 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) | |
303 | { | |
304 | rtnl_lock(); | |
305 | cfg80211_sched_scan_stopped_rtnl(wiphy); | |
5fe231e8 | 306 | rtnl_unlock(); |
807f8a8c | 307 | } |
807f8a8c LC |
308 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
309 | ||
310 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, | |
311 | bool driver_initiated) | |
312 | { | |
31a60ed1 | 313 | struct cfg80211_sched_scan_request *sched_scan_req; |
807f8a8c LC |
314 | struct net_device *dev; |
315 | ||
5fe231e8 | 316 | ASSERT_RTNL(); |
807f8a8c LC |
317 | |
318 | if (!rdev->sched_scan_req) | |
1a84ff75 | 319 | return -ENOENT; |
807f8a8c | 320 | |
31a60ed1 JR |
321 | sched_scan_req = rtnl_dereference(rdev->sched_scan_req); |
322 | dev = sched_scan_req->dev; | |
807f8a8c | 323 | |
85a9994a | 324 | if (!driver_initiated) { |
e35e4d28 | 325 | int err = rdev_sched_scan_stop(rdev, dev); |
85a9994a LC |
326 | if (err) |
327 | return err; | |
328 | } | |
807f8a8c LC |
329 | |
330 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); | |
331 | ||
31a60ed1 JR |
332 | RCU_INIT_POINTER(rdev->sched_scan_req, NULL); |
333 | kfree_rcu(sched_scan_req, rcu_head); | |
807f8a8c | 334 | |
3b4670ff | 335 | return 0; |
807f8a8c LC |
336 | } |
337 | ||
1b8ec87a | 338 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
339 | unsigned long age_secs) |
340 | { | |
341 | struct cfg80211_internal_bss *bss; | |
342 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
343 | ||
1b8ec87a ZG |
344 | spin_lock_bh(&rdev->bss_lock); |
345 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 346 | bss->ts -= age_jiffies; |
1b8ec87a | 347 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
348 | } |
349 | ||
1b8ec87a | 350 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 351 | { |
1b8ec87a | 352 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
353 | } |
354 | ||
c21dbf92 | 355 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
2a519311 | 356 | { |
c21dbf92 | 357 | while (len > 2 && ies[0] != eid) { |
2a519311 JB |
358 | len -= ies[1] + 2; |
359 | ies += ies[1] + 2; | |
360 | } | |
361 | if (len < 2) | |
362 | return NULL; | |
363 | if (len < 2 + ies[1]) | |
364 | return NULL; | |
365 | return ies; | |
366 | } | |
c21dbf92 | 367 | EXPORT_SYMBOL(cfg80211_find_ie); |
2a519311 | 368 | |
9e9ea439 | 369 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, int oui_type, |
0c28ec58 EP |
370 | const u8 *ies, int len) |
371 | { | |
372 | struct ieee80211_vendor_ie *ie; | |
373 | const u8 *pos = ies, *end = ies + len; | |
374 | int ie_oui; | |
375 | ||
9e9ea439 EG |
376 | if (WARN_ON(oui_type > 0xff)) |
377 | return NULL; | |
378 | ||
0c28ec58 EP |
379 | while (pos < end) { |
380 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, | |
381 | end - pos); | |
382 | if (!pos) | |
383 | return NULL; | |
384 | ||
0c28ec58 | 385 | ie = (struct ieee80211_vendor_ie *)pos; |
6719429d LC |
386 | |
387 | /* make sure we can access ie->len */ | |
388 | BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1); | |
389 | ||
390 | if (ie->len < sizeof(*ie)) | |
391 | goto cont; | |
392 | ||
0c28ec58 | 393 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; |
9e9ea439 EG |
394 | if (ie_oui == oui && |
395 | (oui_type < 0 || ie->oui_type == oui_type)) | |
0c28ec58 | 396 | return pos; |
6719429d | 397 | cont: |
0c28ec58 EP |
398 | pos += 2 + ie->len; |
399 | } | |
400 | return NULL; | |
401 | } | |
402 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
403 | ||
915de2ff | 404 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
2a519311 JB |
405 | const u8 *ssid, size_t ssid_len) |
406 | { | |
9caf0364 | 407 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
408 | const u8 *ssidie; |
409 | ||
ac422d3c | 410 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
411 | return false; |
412 | ||
79420f09 JB |
413 | if (!ssid) |
414 | return true; | |
415 | ||
9caf0364 JB |
416 | ies = rcu_access_pointer(a->ies); |
417 | if (!ies) | |
418 | return false; | |
419 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
2a519311 JB |
420 | if (!ssidie) |
421 | return false; | |
422 | if (ssidie[1] != ssid_len) | |
423 | return false; | |
424 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
425 | } | |
426 | ||
4593c4cb JB |
427 | /** |
428 | * enum bss_compare_mode - BSS compare mode | |
429 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
430 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
431 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
432 | */ | |
433 | enum bss_compare_mode { | |
434 | BSS_CMP_REGULAR, | |
435 | BSS_CMP_HIDE_ZLEN, | |
436 | BSS_CMP_HIDE_NUL, | |
437 | }; | |
438 | ||
dd9dfb9f | 439 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 440 | struct cfg80211_bss *b, |
4593c4cb | 441 | enum bss_compare_mode mode) |
dd9dfb9f | 442 | { |
9caf0364 | 443 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
444 | const u8 *ie1 = NULL; |
445 | const u8 *ie2 = NULL; | |
5622f5bb | 446 | int i, r; |
dd9dfb9f | 447 | |
3af6341c JB |
448 | if (a->channel != b->channel) |
449 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 450 | |
9caf0364 JB |
451 | a_ies = rcu_access_pointer(a->ies); |
452 | if (!a_ies) | |
453 | return -1; | |
454 | b_ies = rcu_access_pointer(b->ies); | |
455 | if (!b_ies) | |
456 | return 1; | |
457 | ||
3af6341c JB |
458 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
459 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
460 | a_ies->data, a_ies->len); | |
461 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
462 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
463 | b_ies->data, b_ies->len); | |
464 | if (ie1 && ie2) { | |
465 | int mesh_id_cmp; | |
466 | ||
467 | if (ie1[1] == ie2[1]) | |
468 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
469 | else | |
470 | mesh_id_cmp = ie2[1] - ie1[1]; | |
471 | ||
472 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
473 | a_ies->data, a_ies->len); | |
474 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
475 | b_ies->data, b_ies->len); | |
476 | if (ie1 && ie2) { | |
477 | if (mesh_id_cmp) | |
478 | return mesh_id_cmp; | |
479 | if (ie1[1] != ie2[1]) | |
480 | return ie2[1] - ie1[1]; | |
481 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
482 | } | |
483 | } | |
484 | ||
3af6341c JB |
485 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
486 | if (r) | |
487 | return r; | |
488 | ||
9caf0364 JB |
489 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
490 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 491 | |
5622f5bb JB |
492 | if (!ie1 && !ie2) |
493 | return 0; | |
494 | ||
f94f8b16 | 495 | /* |
5622f5bb JB |
496 | * Note that with "hide_ssid", the function returns a match if |
497 | * the already-present BSS ("b") is a hidden SSID beacon for | |
498 | * the new BSS ("a"). | |
f94f8b16 | 499 | */ |
dd9dfb9f DT |
500 | |
501 | /* sort missing IE before (left of) present IE */ | |
502 | if (!ie1) | |
503 | return -1; | |
504 | if (!ie2) | |
505 | return 1; | |
506 | ||
4593c4cb JB |
507 | switch (mode) { |
508 | case BSS_CMP_HIDE_ZLEN: | |
509 | /* | |
510 | * In ZLEN mode we assume the BSS entry we're | |
511 | * looking for has a zero-length SSID. So if | |
512 | * the one we're looking at right now has that, | |
513 | * return 0. Otherwise, return the difference | |
514 | * in length, but since we're looking for the | |
515 | * 0-length it's really equivalent to returning | |
516 | * the length of the one we're looking at. | |
517 | * | |
518 | * No content comparison is needed as we assume | |
519 | * the content length is zero. | |
520 | */ | |
521 | return ie2[1]; | |
522 | case BSS_CMP_REGULAR: | |
523 | default: | |
524 | /* sort by length first, then by contents */ | |
525 | if (ie1[1] != ie2[1]) | |
526 | return ie2[1] - ie1[1]; | |
5622f5bb | 527 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
528 | case BSS_CMP_HIDE_NUL: |
529 | if (ie1[1] != ie2[1]) | |
530 | return ie2[1] - ie1[1]; | |
531 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
532 | for (i = 0; i < ie2[1]; i++) | |
533 | if (ie2[i + 2]) | |
534 | return -1; | |
535 | return 0; | |
536 | } | |
dd9dfb9f DT |
537 | } |
538 | ||
6eb18137 | 539 | static bool cfg80211_bss_type_match(u16 capability, |
57fbcce3 | 540 | enum nl80211_band band, |
6eb18137 DL |
541 | enum ieee80211_bss_type bss_type) |
542 | { | |
543 | bool ret = true; | |
544 | u16 mask, val; | |
545 | ||
546 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
547 | return ret; | |
548 | ||
57fbcce3 | 549 | if (band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
550 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; |
551 | switch (bss_type) { | |
552 | case IEEE80211_BSS_TYPE_ESS: | |
553 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
554 | break; | |
555 | case IEEE80211_BSS_TYPE_PBSS: | |
556 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
557 | break; | |
558 | case IEEE80211_BSS_TYPE_IBSS: | |
559 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
560 | break; | |
561 | default: | |
562 | return false; | |
563 | } | |
564 | } else { | |
565 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
566 | switch (bss_type) { | |
567 | case IEEE80211_BSS_TYPE_ESS: | |
568 | val = WLAN_CAPABILITY_ESS; | |
569 | break; | |
570 | case IEEE80211_BSS_TYPE_IBSS: | |
571 | val = WLAN_CAPABILITY_IBSS; | |
572 | break; | |
573 | case IEEE80211_BSS_TYPE_MBSS: | |
574 | val = 0; | |
575 | break; | |
576 | default: | |
577 | return false; | |
578 | } | |
579 | } | |
580 | ||
581 | ret = ((capability & mask) == val); | |
582 | return ret; | |
583 | } | |
584 | ||
0e3a39b5 | 585 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 JB |
586 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
587 | struct ieee80211_channel *channel, | |
588 | const u8 *bssid, | |
79420f09 | 589 | const u8 *ssid, size_t ssid_len, |
6eb18137 DL |
590 | enum ieee80211_bss_type bss_type, |
591 | enum ieee80211_privacy privacy) | |
2a519311 | 592 | { |
f26cbf40 | 593 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 594 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 595 | unsigned long now = jiffies; |
6eb18137 | 596 | int bss_privacy; |
2a519311 | 597 | |
6eb18137 DL |
598 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
599 | privacy); | |
4ee3e063 | 600 | |
1b8ec87a | 601 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 602 | |
1b8ec87a | 603 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
604 | if (!cfg80211_bss_type_match(bss->pub.capability, |
605 | bss->pub.channel->band, bss_type)) | |
606 | continue; | |
607 | ||
608 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
609 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
610 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 611 | continue; |
2a519311 JB |
612 | if (channel && bss->pub.channel != channel) |
613 | continue; | |
c14a7400 JB |
614 | if (!is_valid_ether_addr(bss->pub.bssid)) |
615 | continue; | |
ccb6c136 JB |
616 | /* Don't get expired BSS structs */ |
617 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
618 | !atomic_read(&bss->hold)) | |
619 | continue; | |
2a519311 JB |
620 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
621 | res = bss; | |
1b8ec87a | 622 | bss_ref_get(rdev, res); |
2a519311 JB |
623 | break; |
624 | } | |
625 | } | |
626 | ||
1b8ec87a | 627 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
628 | if (!res) |
629 | return NULL; | |
4ee3e063 | 630 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
631 | return &res->pub; |
632 | } | |
633 | EXPORT_SYMBOL(cfg80211_get_bss); | |
634 | ||
1b8ec87a | 635 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
636 | struct cfg80211_internal_bss *bss) |
637 | { | |
1b8ec87a | 638 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
639 | struct rb_node *parent = NULL; |
640 | struct cfg80211_internal_bss *tbss; | |
641 | int cmp; | |
642 | ||
643 | while (*p) { | |
644 | parent = *p; | |
645 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
646 | ||
4593c4cb | 647 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
648 | |
649 | if (WARN_ON(!cmp)) { | |
650 | /* will sort of leak this BSS */ | |
651 | return; | |
652 | } | |
653 | ||
654 | if (cmp < 0) | |
655 | p = &(*p)->rb_left; | |
656 | else | |
657 | p = &(*p)->rb_right; | |
658 | } | |
659 | ||
660 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 661 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
662 | } |
663 | ||
664 | static struct cfg80211_internal_bss * | |
1b8ec87a | 665 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 666 | struct cfg80211_internal_bss *res, |
4593c4cb | 667 | enum bss_compare_mode mode) |
dd9dfb9f | 668 | { |
1b8ec87a | 669 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
670 | struct cfg80211_internal_bss *bss; |
671 | int r; | |
672 | ||
673 | while (n) { | |
674 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 675 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
676 | |
677 | if (r == 0) | |
678 | return bss; | |
679 | else if (r < 0) | |
680 | n = n->rb_left; | |
681 | else | |
682 | n = n->rb_right; | |
683 | } | |
684 | ||
685 | return NULL; | |
686 | } | |
687 | ||
1b8ec87a | 688 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 689 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 690 | { |
9caf0364 | 691 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
692 | struct cfg80211_internal_bss *bss; |
693 | const u8 *ie; | |
694 | int i, ssidlen; | |
695 | u8 fold = 0; | |
9caf0364 | 696 | |
776b3580 | 697 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 698 | if (WARN_ON(!ies)) |
776b3580 | 699 | return false; |
dd9dfb9f | 700 | |
776b3580 JB |
701 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
702 | if (!ie) { | |
703 | /* nothing to do */ | |
704 | return true; | |
705 | } | |
706 | ||
707 | ssidlen = ie[1]; | |
708 | for (i = 0; i < ssidlen; i++) | |
709 | fold |= ie[2 + i]; | |
710 | ||
711 | if (fold) { | |
712 | /* not a hidden SSID */ | |
713 | return true; | |
714 | } | |
715 | ||
716 | /* This is the bad part ... */ | |
717 | ||
1b8ec87a | 718 | list_for_each_entry(bss, &rdev->bss_list, list) { |
776b3580 JB |
719 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
720 | continue; | |
721 | if (bss->pub.channel != new->pub.channel) | |
722 | continue; | |
dcd6eac1 SW |
723 | if (bss->pub.scan_width != new->pub.scan_width) |
724 | continue; | |
776b3580 JB |
725 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
726 | continue; | |
727 | ies = rcu_access_pointer(bss->pub.ies); | |
728 | if (!ies) | |
729 | continue; | |
730 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
731 | if (!ie) | |
732 | continue; | |
733 | if (ssidlen && ie[1] != ssidlen) | |
734 | continue; | |
776b3580 JB |
735 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
736 | continue; | |
737 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
738 | list_del(&bss->hidden_list); | |
739 | /* combine them */ | |
740 | list_add(&bss->hidden_list, &new->hidden_list); | |
741 | bss->pub.hidden_beacon_bss = &new->pub; | |
742 | new->refcount += bss->refcount; | |
743 | rcu_assign_pointer(bss->pub.beacon_ies, | |
744 | new->pub.beacon_ies); | |
745 | } | |
746 | ||
747 | return true; | |
dd9dfb9f DT |
748 | } |
749 | ||
0e3a39b5 | 750 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 | 751 | static struct cfg80211_internal_bss * |
1b8ec87a | 752 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
3afc2167 EG |
753 | struct cfg80211_internal_bss *tmp, |
754 | bool signal_valid) | |
2a519311 JB |
755 | { |
756 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 757 | |
9caf0364 | 758 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 759 | return NULL; |
2a519311 | 760 | |
9caf0364 | 761 | tmp->ts = jiffies; |
2a519311 | 762 | |
1b8ec87a | 763 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 764 | |
9caf0364 | 765 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
1b8ec87a | 766 | spin_unlock_bh(&rdev->bss_lock); |
9caf0364 JB |
767 | return NULL; |
768 | } | |
769 | ||
1b8ec87a | 770 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 771 | |
cd1658f5 | 772 | if (found) { |
34a6eddb | 773 | /* Update IEs */ |
9caf0364 JB |
774 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
775 | const struct cfg80211_bss_ies *old; | |
776 | ||
777 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 778 | |
9caf0364 JB |
779 | rcu_assign_pointer(found->pub.proberesp_ies, |
780 | tmp->pub.proberesp_ies); | |
34a6eddb | 781 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
782 | rcu_assign_pointer(found->pub.ies, |
783 | tmp->pub.proberesp_ies); | |
784 | if (old) | |
785 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
786 | rcu_head); | |
787 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
9537f227 | 788 | const struct cfg80211_bss_ies *old; |
776b3580 JB |
789 | struct cfg80211_internal_bss *bss; |
790 | ||
791 | if (found->pub.hidden_beacon_bss && | |
792 | !list_empty(&found->hidden_list)) { | |
1345ee6a JB |
793 | const struct cfg80211_bss_ies *f; |
794 | ||
776b3580 JB |
795 | /* |
796 | * The found BSS struct is one of the probe | |
797 | * response members of a group, but we're | |
798 | * receiving a beacon (beacon_ies in the tmp | |
799 | * bss is used). This can only mean that the | |
800 | * AP changed its beacon from not having an | |
801 | * SSID to showing it, which is confusing so | |
802 | * drop this information. | |
803 | */ | |
1345ee6a JB |
804 | |
805 | f = rcu_access_pointer(tmp->pub.beacon_ies); | |
806 | kfree_rcu((struct cfg80211_bss_ies *)f, | |
807 | rcu_head); | |
776b3580 JB |
808 | goto drop; |
809 | } | |
915de2ff | 810 | |
9caf0364 | 811 | old = rcu_access_pointer(found->pub.beacon_ies); |
9caf0364 JB |
812 | |
813 | rcu_assign_pointer(found->pub.beacon_ies, | |
814 | tmp->pub.beacon_ies); | |
01123e23 SN |
815 | |
816 | /* Override IEs if they were from a beacon before */ | |
9537f227 | 817 | if (old == rcu_access_pointer(found->pub.ies)) |
9caf0364 JB |
818 | rcu_assign_pointer(found->pub.ies, |
819 | tmp->pub.beacon_ies); | |
cd1658f5 | 820 | |
776b3580 JB |
821 | /* Assign beacon IEs to all sub entries */ |
822 | list_for_each_entry(bss, &found->hidden_list, | |
823 | hidden_list) { | |
824 | const struct cfg80211_bss_ies *ies; | |
825 | ||
826 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
827 | WARN_ON(ies != old); | |
828 | ||
829 | rcu_assign_pointer(bss->pub.beacon_ies, | |
830 | tmp->pub.beacon_ies); | |
831 | } | |
832 | ||
9caf0364 JB |
833 | if (old) |
834 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
835 | rcu_head); | |
836 | } | |
1345ee6a JB |
837 | |
838 | found->pub.beacon_interval = tmp->pub.beacon_interval; | |
3afc2167 EG |
839 | /* |
840 | * don't update the signal if beacon was heard on | |
841 | * adjacent channel. | |
842 | */ | |
843 | if (signal_valid) | |
844 | found->pub.signal = tmp->pub.signal; | |
1345ee6a JB |
845 | found->pub.capability = tmp->pub.capability; |
846 | found->ts = tmp->ts; | |
6e19bc4b | 847 | found->ts_boottime = tmp->ts_boottime; |
1d76250b AS |
848 | found->parent_tsf = tmp->parent_tsf; |
849 | ether_addr_copy(found->parent_bssid, tmp->parent_bssid); | |
2a519311 | 850 | } else { |
9caf0364 | 851 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 852 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 853 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 854 | |
9caf0364 JB |
855 | /* |
856 | * create a copy -- the "res" variable that is passed in | |
857 | * is allocated on the stack since it's not needed in the | |
858 | * more common case of an update | |
859 | */ | |
1b8ec87a | 860 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
861 | GFP_ATOMIC); |
862 | if (!new) { | |
863 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
864 | if (ies) | |
865 | kfree_rcu(ies, rcu_head); | |
866 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
867 | if (ies) | |
868 | kfree_rcu(ies, rcu_head); | |
776b3580 | 869 | goto drop; |
9caf0364 JB |
870 | } |
871 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
872 | new->refcount = 1; |
873 | INIT_LIST_HEAD(&new->hidden_list); | |
874 | ||
875 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 876 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 877 | if (!hidden) |
1b8ec87a | 878 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
879 | BSS_CMP_HIDE_NUL); |
880 | if (hidden) { | |
881 | new->pub.hidden_beacon_bss = &hidden->pub; | |
882 | list_add(&new->hidden_list, | |
883 | &hidden->hidden_list); | |
884 | hidden->refcount++; | |
885 | rcu_assign_pointer(new->pub.beacon_ies, | |
886 | hidden->pub.beacon_ies); | |
887 | } | |
888 | } else { | |
889 | /* | |
890 | * Ok so we found a beacon, and don't have an entry. If | |
891 | * it's a beacon with hidden SSID, we might be in for an | |
892 | * expensive search for any probe responses that should | |
893 | * be grouped with this beacon for updates ... | |
894 | */ | |
1b8ec87a | 895 | if (!cfg80211_combine_bsses(rdev, new)) { |
776b3580 JB |
896 | kfree(new); |
897 | goto drop; | |
898 | } | |
899 | } | |
900 | ||
1b8ec87a ZG |
901 | list_add_tail(&new->list, &rdev->bss_list); |
902 | rb_insert_bss(rdev, new); | |
9caf0364 | 903 | found = new; |
2a519311 JB |
904 | } |
905 | ||
1b8ec87a ZG |
906 | rdev->bss_generation++; |
907 | bss_ref_get(rdev, found); | |
908 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 | 909 | |
2a519311 | 910 | return found; |
776b3580 | 911 | drop: |
1b8ec87a | 912 | spin_unlock_bh(&rdev->bss_lock); |
776b3580 | 913 | return NULL; |
2a519311 JB |
914 | } |
915 | ||
0172bb75 JB |
916 | static struct ieee80211_channel * |
917 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
918 | struct ieee80211_channel *channel) | |
919 | { | |
920 | const u8 *tmp; | |
921 | u32 freq; | |
922 | int channel_number = -1; | |
923 | ||
924 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
925 | if (tmp && tmp[1] == 1) { | |
926 | channel_number = tmp[2]; | |
927 | } else { | |
928 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
929 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
930 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
931 | ||
932 | channel_number = htop->primary_chan; | |
933 | } | |
934 | } | |
935 | ||
936 | if (channel_number < 0) | |
937 | return channel; | |
938 | ||
939 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
940 | channel = ieee80211_get_channel(wiphy, freq); | |
941 | if (!channel) | |
942 | return NULL; | |
943 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
944 | return NULL; | |
945 | return channel; | |
946 | } | |
947 | ||
0e3a39b5 | 948 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
6e19bc4b DS |
949 | struct cfg80211_bss * |
950 | cfg80211_inform_bss_data(struct wiphy *wiphy, | |
951 | struct cfg80211_inform_bss *data, | |
952 | enum cfg80211_bss_frame_type ftype, | |
953 | const u8 *bssid, u64 tsf, u16 capability, | |
954 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
955 | gfp_t gfp) | |
06aa7afa | 956 | { |
9caf0364 | 957 | struct cfg80211_bss_ies *ies; |
3afc2167 | 958 | struct ieee80211_channel *channel; |
9caf0364 | 959 | struct cfg80211_internal_bss tmp = {}, *res; |
6eb18137 | 960 | int bss_type; |
67af9811 | 961 | bool signal_valid; |
06aa7afa JK |
962 | |
963 | if (WARN_ON(!wiphy)) | |
964 | return NULL; | |
965 | ||
22fe88d3 | 966 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 967 | (data->signal < 0 || data->signal > 100))) |
06aa7afa JK |
968 | return NULL; |
969 | ||
6e19bc4b | 970 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan); |
0172bb75 JB |
971 | if (!channel) |
972 | return NULL; | |
973 | ||
9caf0364 JB |
974 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
975 | tmp.pub.channel = channel; | |
6e19bc4b DS |
976 | tmp.pub.scan_width = data->scan_width; |
977 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
978 | tmp.pub.beacon_interval = beacon_interval; |
979 | tmp.pub.capability = capability; | |
6e19bc4b DS |
980 | tmp.ts_boottime = data->boottime_ns; |
981 | ||
34a6eddb | 982 | /* |
5bc8c1f2 | 983 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
984 | * Response frame, we need to pick one of the options and only use it |
985 | * with the driver that does not provide the full Beacon/Probe Response | |
986 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 987 | * override the IEs pointer should we have received an earlier |
9caf0364 | 988 | * indication of Probe Response data. |
34a6eddb | 989 | */ |
0e227084 | 990 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 JB |
991 | if (!ies) |
992 | return NULL; | |
993 | ies->len = ielen; | |
8cef2c9d | 994 | ies->tsf = tsf; |
0e227084 | 995 | ies->from_beacon = false; |
9caf0364 | 996 | memcpy(ies->data, ie, ielen); |
06aa7afa | 997 | |
5bc8c1f2 JB |
998 | switch (ftype) { |
999 | case CFG80211_BSS_FTYPE_BEACON: | |
1000 | ies->from_beacon = true; | |
1001 | /* fall through to assign */ | |
1002 | case CFG80211_BSS_FTYPE_UNKNOWN: | |
1003 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1004 | break; | |
1005 | case CFG80211_BSS_FTYPE_PRESP: | |
1006 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1007 | break; | |
1008 | } | |
9caf0364 | 1009 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 1010 | |
6e19bc4b | 1011 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1012 | wiphy->max_adj_channel_rssi_comp; |
1013 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
06aa7afa JK |
1014 | if (!res) |
1015 | return NULL; | |
1016 | ||
57fbcce3 | 1017 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1018 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1019 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1020 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1021 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1022 | } else { | |
1023 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1024 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1025 | } | |
06aa7afa | 1026 | |
4ee3e063 | 1027 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
1028 | /* cfg80211_bss_update gives us a referenced result */ |
1029 | return &res->pub; | |
1030 | } | |
6e19bc4b | 1031 | EXPORT_SYMBOL(cfg80211_inform_bss_data); |
06aa7afa | 1032 | |
6e19bc4b | 1033 | /* cfg80211_inform_bss_width_frame helper */ |
2a519311 | 1034 | struct cfg80211_bss * |
6e19bc4b DS |
1035 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, |
1036 | struct cfg80211_inform_bss *data, | |
1037 | struct ieee80211_mgmt *mgmt, size_t len, | |
1038 | gfp_t gfp) | |
1039 | ||
2a519311 | 1040 | { |
9caf0364 JB |
1041 | struct cfg80211_internal_bss tmp = {}, *res; |
1042 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 1043 | struct ieee80211_channel *channel; |
67af9811 | 1044 | bool signal_valid; |
2a519311 JB |
1045 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
1046 | u.probe_resp.variable); | |
6eb18137 | 1047 | int bss_type; |
bef9bacc | 1048 | |
0172bb75 JB |
1049 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
1050 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
1051 | ||
6e19bc4b | 1052 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
4ee3e063 | 1053 | |
bef9bacc MK |
1054 | if (WARN_ON(!mgmt)) |
1055 | return NULL; | |
1056 | ||
1057 | if (WARN_ON(!wiphy)) | |
1058 | return NULL; | |
2a519311 | 1059 | |
22fe88d3 | 1060 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1061 | (data->signal < 0 || data->signal > 100))) |
2a519311 JB |
1062 | return NULL; |
1063 | ||
bef9bacc | 1064 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
1065 | return NULL; |
1066 | ||
0172bb75 | 1067 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
6e19bc4b | 1068 | ielen, data->chan); |
0172bb75 JB |
1069 | if (!channel) |
1070 | return NULL; | |
1071 | ||
0e227084 | 1072 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 1073 | if (!ies) |
2a519311 | 1074 | return NULL; |
9caf0364 | 1075 | ies->len = ielen; |
8cef2c9d | 1076 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
0e227084 | 1077 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); |
9caf0364 | 1078 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
2a519311 | 1079 | |
9caf0364 JB |
1080 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
1081 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1082 | else | |
1083 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1084 | rcu_assign_pointer(tmp.pub.ies, ies); | |
1085 | ||
1086 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); | |
1087 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1088 | tmp.pub.scan_width = data->scan_width; |
1089 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1090 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
1091 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
6e19bc4b | 1092 | tmp.ts_boottime = data->boottime_ns; |
1d76250b AS |
1093 | tmp.parent_tsf = data->parent_tsf; |
1094 | ether_addr_copy(tmp.parent_bssid, data->parent_bssid); | |
9caf0364 | 1095 | |
6e19bc4b | 1096 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1097 | wiphy->max_adj_channel_rssi_comp; |
1098 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
2a519311 JB |
1099 | if (!res) |
1100 | return NULL; | |
1101 | ||
57fbcce3 | 1102 | if (channel->band == NL80211_BAND_60GHZ) { |
6eb18137 DL |
1103 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; |
1104 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1105 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1106 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1107 | } else { | |
1108 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1109 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1110 | } | |
e38f8a7a | 1111 | |
4ee3e063 | 1112 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1113 | /* cfg80211_bss_update gives us a referenced result */ |
1114 | return &res->pub; | |
1115 | } | |
6e19bc4b | 1116 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 1117 | |
5b112d3d | 1118 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 1119 | { |
f26cbf40 | 1120 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
1121 | struct cfg80211_internal_bss *bss; |
1122 | ||
1123 | if (!pub) | |
1124 | return; | |
1125 | ||
1126 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1127 | |
1b8ec87a ZG |
1128 | spin_lock_bh(&rdev->bss_lock); |
1129 | bss_ref_get(rdev, bss); | |
1130 | spin_unlock_bh(&rdev->bss_lock); | |
4c0c0b75 JB |
1131 | } |
1132 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
1133 | ||
5b112d3d | 1134 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 1135 | { |
f26cbf40 | 1136 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
1137 | struct cfg80211_internal_bss *bss; |
1138 | ||
1139 | if (!pub) | |
1140 | return; | |
1141 | ||
1142 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1143 | |
1b8ec87a ZG |
1144 | spin_lock_bh(&rdev->bss_lock); |
1145 | bss_ref_put(rdev, bss); | |
1146 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 JB |
1147 | } |
1148 | EXPORT_SYMBOL(cfg80211_put_bss); | |
1149 | ||
d491af19 JB |
1150 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1151 | { | |
f26cbf40 | 1152 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
d491af19 JB |
1153 | struct cfg80211_internal_bss *bss; |
1154 | ||
1155 | if (WARN_ON(!pub)) | |
1156 | return; | |
1157 | ||
1158 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
1159 | ||
1b8ec87a | 1160 | spin_lock_bh(&rdev->bss_lock); |
3207390a | 1161 | if (!list_empty(&bss->list)) { |
1b8ec87a ZG |
1162 | if (__cfg80211_unlink_bss(rdev, bss)) |
1163 | rdev->bss_generation++; | |
3207390a | 1164 | } |
1b8ec87a | 1165 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
1166 | } |
1167 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
1168 | ||
3d23e349 | 1169 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
1170 | static struct cfg80211_registered_device * |
1171 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
1172 | { | |
5fe231e8 | 1173 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
1174 | struct net_device *dev; |
1175 | ||
5fe231e8 JB |
1176 | ASSERT_RTNL(); |
1177 | ||
9f419f38 JB |
1178 | dev = dev_get_by_index(net, ifindex); |
1179 | if (!dev) | |
5fe231e8 JB |
1180 | return ERR_PTR(-ENODEV); |
1181 | if (dev->ieee80211_ptr) | |
f26cbf40 | 1182 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 1183 | else |
9f419f38 JB |
1184 | rdev = ERR_PTR(-ENODEV); |
1185 | dev_put(dev); | |
9f419f38 JB |
1186 | return rdev; |
1187 | } | |
1188 | ||
2a519311 JB |
1189 | int cfg80211_wext_siwscan(struct net_device *dev, |
1190 | struct iw_request_info *info, | |
1191 | union iwreq_data *wrqu, char *extra) | |
1192 | { | |
1193 | struct cfg80211_registered_device *rdev; | |
1194 | struct wiphy *wiphy; | |
1195 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 1196 | struct cfg80211_scan_request *creq = NULL; |
2a519311 | 1197 | int i, err, n_channels = 0; |
57fbcce3 | 1198 | enum nl80211_band band; |
2a519311 JB |
1199 | |
1200 | if (!netif_running(dev)) | |
1201 | return -ENETDOWN; | |
1202 | ||
b2e3abdc HS |
1203 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
1204 | wreq = (struct iw_scan_req *)extra; | |
1205 | ||
463d0183 | 1206 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1207 | |
1208 | if (IS_ERR(rdev)) | |
1209 | return PTR_ERR(rdev); | |
1210 | ||
f9d15d16 | 1211 | if (rdev->scan_req || rdev->scan_msg) { |
2a519311 JB |
1212 | err = -EBUSY; |
1213 | goto out; | |
1214 | } | |
1215 | ||
1216 | wiphy = &rdev->wiphy; | |
1217 | ||
b2e3abdc HS |
1218 | /* Determine number of channels, needed to allocate creq */ |
1219 | if (wreq && wreq->num_channels) | |
1220 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
1221 | else |
1222 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
1223 | |
1224 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1225 | n_channels * sizeof(void *), | |
1226 | GFP_ATOMIC); | |
1227 | if (!creq) { | |
1228 | err = -ENOMEM; | |
1229 | goto out; | |
1230 | } | |
1231 | ||
1232 | creq->wiphy = wiphy; | |
fd014284 | 1233 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1234 | /* SSIDs come after channels */ |
1235 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1236 | creq->n_channels = n_channels; |
1237 | creq->n_ssids = 1; | |
15d6030b | 1238 | creq->scan_start = jiffies; |
2a519311 | 1239 | |
b2e3abdc | 1240 | /* translate "Scan on frequencies" request */ |
2a519311 | 1241 | i = 0; |
57fbcce3 | 1242 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
2a519311 | 1243 | int j; |
584991dc | 1244 | |
2a519311 JB |
1245 | if (!wiphy->bands[band]) |
1246 | continue; | |
584991dc | 1247 | |
2a519311 | 1248 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1249 | /* ignore disabled channels */ |
1250 | if (wiphy->bands[band]->channels[j].flags & | |
1251 | IEEE80211_CHAN_DISABLED) | |
1252 | continue; | |
b2e3abdc HS |
1253 | |
1254 | /* If we have a wireless request structure and the | |
1255 | * wireless request specifies frequencies, then search | |
1256 | * for the matching hardware channel. | |
1257 | */ | |
1258 | if (wreq && wreq->num_channels) { | |
1259 | int k; | |
1260 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1261 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
1262 | struct iw_freq *freq = |
1263 | &wreq->channel_list[k]; | |
1264 | int wext_freq = | |
1265 | cfg80211_wext_freq(freq); | |
1266 | ||
b2e3abdc HS |
1267 | if (wext_freq == wiphy_freq) |
1268 | goto wext_freq_found; | |
1269 | } | |
1270 | goto wext_freq_not_found; | |
1271 | } | |
1272 | ||
1273 | wext_freq_found: | |
2a519311 JB |
1274 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1275 | i++; | |
b2e3abdc | 1276 | wext_freq_not_found: ; |
2a519311 JB |
1277 | } |
1278 | } | |
8862dc5f HS |
1279 | /* No channels found? */ |
1280 | if (!i) { | |
1281 | err = -EINVAL; | |
1282 | goto out; | |
1283 | } | |
2a519311 | 1284 | |
b2e3abdc HS |
1285 | /* Set real number of channels specified in creq->channels[] */ |
1286 | creq->n_channels = i; | |
2a519311 | 1287 | |
b2e3abdc HS |
1288 | /* translate "Scan for SSID" request */ |
1289 | if (wreq) { | |
2a519311 | 1290 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1291 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1292 | err = -EINVAL; | |
1293 | goto out; | |
1294 | } | |
2a519311 JB |
1295 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1296 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1297 | } | |
1298 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1299 | creq->n_ssids = 0; | |
1300 | } | |
1301 | ||
57fbcce3 | 1302 | for (i = 0; i < NUM_NL80211_BANDS; i++) |
a401d2bb JB |
1303 | if (wiphy->bands[i]) |
1304 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1305 | |
818965d3 JM |
1306 | eth_broadcast_addr(creq->bssid); |
1307 | ||
2a519311 | 1308 | rdev->scan_req = creq; |
e35e4d28 | 1309 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1310 | if (err) { |
1311 | rdev->scan_req = NULL; | |
65486c8b | 1312 | /* creq will be freed below */ |
463d0183 | 1313 | } else { |
fd014284 | 1314 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1315 | /* creq now owned by driver */ |
1316 | creq = NULL; | |
463d0183 JB |
1317 | dev_hold(dev); |
1318 | } | |
2a519311 | 1319 | out: |
65486c8b | 1320 | kfree(creq); |
2a519311 JB |
1321 | return err; |
1322 | } | |
2afe38d1 | 1323 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 1324 | |
76a70e9c JM |
1325 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
1326 | const struct cfg80211_bss_ies *ies, | |
1327 | char *current_ev, char *end_buf) | |
2a519311 | 1328 | { |
9caf0364 | 1329 | const u8 *pos, *end, *next; |
2a519311 JB |
1330 | struct iw_event iwe; |
1331 | ||
9caf0364 | 1332 | if (!ies) |
76a70e9c | 1333 | return current_ev; |
2a519311 JB |
1334 | |
1335 | /* | |
1336 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1337 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1338 | */ | |
9caf0364 JB |
1339 | pos = ies->data; |
1340 | end = pos + ies->len; | |
2a519311 JB |
1341 | |
1342 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1343 | next = pos + 2 + pos[1]; | |
1344 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1345 | next = next + 2 + next[1]; | |
1346 | ||
1347 | memset(&iwe, 0, sizeof(iwe)); | |
1348 | iwe.cmd = IWEVGENIE; | |
1349 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
1350 | current_ev = iwe_stream_add_point_check(info, current_ev, |
1351 | end_buf, &iwe, | |
1352 | (void *)pos); | |
1353 | if (IS_ERR(current_ev)) | |
1354 | return current_ev; | |
2a519311 JB |
1355 | pos = next; |
1356 | } | |
1357 | ||
1358 | if (end > pos) { | |
1359 | memset(&iwe, 0, sizeof(iwe)); | |
1360 | iwe.cmd = IWEVGENIE; | |
1361 | iwe.u.data.length = end - pos; | |
76a70e9c JM |
1362 | current_ev = iwe_stream_add_point_check(info, current_ev, |
1363 | end_buf, &iwe, | |
1364 | (void *)pos); | |
1365 | if (IS_ERR(current_ev)) | |
1366 | return current_ev; | |
2a519311 | 1367 | } |
76a70e9c JM |
1368 | |
1369 | return current_ev; | |
2a519311 JB |
1370 | } |
1371 | ||
2a519311 | 1372 | static char * |
77965c97 JB |
1373 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1374 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1375 | char *end_buf) | |
2a519311 | 1376 | { |
9caf0364 | 1377 | const struct cfg80211_bss_ies *ies; |
2a519311 | 1378 | struct iw_event iwe; |
9caf0364 | 1379 | const u8 *ie; |
76a70e9c JM |
1380 | u8 buf[50]; |
1381 | u8 *cfg, *p, *tmp; | |
9caf0364 | 1382 | int rem, i, sig; |
2a519311 JB |
1383 | bool ismesh = false; |
1384 | ||
1385 | memset(&iwe, 0, sizeof(iwe)); | |
1386 | iwe.cmd = SIOCGIWAP; | |
1387 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1388 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
1389 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1390 | IW_EV_ADDR_LEN); | |
1391 | if (IS_ERR(current_ev)) | |
1392 | return current_ev; | |
2a519311 JB |
1393 | |
1394 | memset(&iwe, 0, sizeof(iwe)); | |
1395 | iwe.cmd = SIOCGIWFREQ; | |
1396 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1397 | iwe.u.freq.e = 0; | |
76a70e9c JM |
1398 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1399 | IW_EV_FREQ_LEN); | |
1400 | if (IS_ERR(current_ev)) | |
1401 | return current_ev; | |
2a519311 JB |
1402 | |
1403 | memset(&iwe, 0, sizeof(iwe)); | |
1404 | iwe.cmd = SIOCGIWFREQ; | |
1405 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1406 | iwe.u.freq.e = 6; | |
76a70e9c JM |
1407 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1408 | IW_EV_FREQ_LEN); | |
1409 | if (IS_ERR(current_ev)) | |
1410 | return current_ev; | |
2a519311 | 1411 | |
77965c97 | 1412 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1413 | memset(&iwe, 0, sizeof(iwe)); |
1414 | iwe.cmd = IWEVQUAL; | |
1415 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1416 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1417 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1418 | switch (wiphy->signal_type) { |
2a519311 | 1419 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1420 | sig = bss->pub.signal / 100; |
1421 | iwe.u.qual.level = sig; | |
2a519311 | 1422 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1423 | if (sig < -110) /* rather bad */ |
1424 | sig = -110; | |
1425 | else if (sig > -40) /* perfect */ | |
1426 | sig = -40; | |
1427 | /* will give a range of 0 .. 70 */ | |
1428 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1429 | break; |
1430 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1431 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1432 | /* will give range 0 .. 100 */ |
1433 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1434 | break; |
1435 | default: | |
1436 | /* not reached */ | |
1437 | break; | |
1438 | } | |
76a70e9c JM |
1439 | current_ev = iwe_stream_add_event_check(info, current_ev, |
1440 | end_buf, &iwe, | |
1441 | IW_EV_QUAL_LEN); | |
1442 | if (IS_ERR(current_ev)) | |
1443 | return current_ev; | |
2a519311 JB |
1444 | } |
1445 | ||
1446 | memset(&iwe, 0, sizeof(iwe)); | |
1447 | iwe.cmd = SIOCGIWENCODE; | |
1448 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1449 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1450 | else | |
1451 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1452 | iwe.u.data.length = 0; | |
76a70e9c JM |
1453 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
1454 | &iwe, ""); | |
1455 | if (IS_ERR(current_ev)) | |
1456 | return current_ev; | |
2a519311 | 1457 | |
9caf0364 JB |
1458 | rcu_read_lock(); |
1459 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
1460 | rem = ies->len; |
1461 | ie = ies->data; | |
9caf0364 | 1462 | |
83c7aa1a | 1463 | while (rem >= 2) { |
2a519311 JB |
1464 | /* invalid data */ |
1465 | if (ie[1] > rem - 2) | |
1466 | break; | |
1467 | ||
1468 | switch (ie[0]) { | |
1469 | case WLAN_EID_SSID: | |
1470 | memset(&iwe, 0, sizeof(iwe)); | |
1471 | iwe.cmd = SIOCGIWESSID; | |
1472 | iwe.u.data.length = ie[1]; | |
1473 | iwe.u.data.flags = 1; | |
76a70e9c JM |
1474 | current_ev = iwe_stream_add_point_check(info, |
1475 | current_ev, | |
1476 | end_buf, &iwe, | |
1477 | (u8 *)ie + 2); | |
1478 | if (IS_ERR(current_ev)) | |
1479 | goto unlock; | |
2a519311 JB |
1480 | break; |
1481 | case WLAN_EID_MESH_ID: | |
1482 | memset(&iwe, 0, sizeof(iwe)); | |
1483 | iwe.cmd = SIOCGIWESSID; | |
1484 | iwe.u.data.length = ie[1]; | |
1485 | iwe.u.data.flags = 1; | |
76a70e9c JM |
1486 | current_ev = iwe_stream_add_point_check(info, |
1487 | current_ev, | |
1488 | end_buf, &iwe, | |
1489 | (u8 *)ie + 2); | |
1490 | if (IS_ERR(current_ev)) | |
1491 | goto unlock; | |
2a519311 JB |
1492 | break; |
1493 | case WLAN_EID_MESH_CONFIG: | |
1494 | ismesh = true; | |
136cfa28 | 1495 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 1496 | break; |
9caf0364 | 1497 | cfg = (u8 *)ie + 2; |
2a519311 JB |
1498 | memset(&iwe, 0, sizeof(iwe)); |
1499 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1500 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1501 | "0x%02X", cfg[0]); | |
2a519311 | 1502 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1503 | current_ev = iwe_stream_add_point_check(info, |
1504 | current_ev, | |
1505 | end_buf, | |
1506 | &iwe, buf); | |
1507 | if (IS_ERR(current_ev)) | |
1508 | goto unlock; | |
76aa5e70 RP |
1509 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1510 | cfg[1]); | |
2a519311 | 1511 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1512 | current_ev = iwe_stream_add_point_check(info, |
1513 | current_ev, | |
1514 | end_buf, | |
1515 | &iwe, buf); | |
1516 | if (IS_ERR(current_ev)) | |
1517 | goto unlock; | |
76aa5e70 RP |
1518 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1519 | cfg[2]); | |
2a519311 | 1520 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1521 | current_ev = iwe_stream_add_point_check(info, |
1522 | current_ev, | |
1523 | end_buf, | |
1524 | &iwe, buf); | |
1525 | if (IS_ERR(current_ev)) | |
1526 | goto unlock; | |
76aa5e70 | 1527 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 | 1528 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1529 | current_ev = iwe_stream_add_point_check(info, |
1530 | current_ev, | |
1531 | end_buf, | |
1532 | &iwe, buf); | |
1533 | if (IS_ERR(current_ev)) | |
1534 | goto unlock; | |
76aa5e70 RP |
1535 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1536 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
1537 | current_ev = iwe_stream_add_point_check(info, |
1538 | current_ev, | |
1539 | end_buf, | |
1540 | &iwe, buf); | |
1541 | if (IS_ERR(current_ev)) | |
1542 | goto unlock; | |
76aa5e70 RP |
1543 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
1544 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
1545 | current_ev = iwe_stream_add_point_check(info, |
1546 | current_ev, | |
1547 | end_buf, | |
1548 | &iwe, buf); | |
1549 | if (IS_ERR(current_ev)) | |
1550 | goto unlock; | |
76aa5e70 | 1551 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
2a519311 | 1552 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1553 | current_ev = iwe_stream_add_point_check(info, |
1554 | current_ev, | |
1555 | end_buf, | |
1556 | &iwe, buf); | |
1557 | if (IS_ERR(current_ev)) | |
1558 | goto unlock; | |
2a519311 JB |
1559 | break; |
1560 | case WLAN_EID_SUPP_RATES: | |
1561 | case WLAN_EID_EXT_SUPP_RATES: | |
1562 | /* display all supported rates in readable format */ | |
1563 | p = current_ev + iwe_stream_lcp_len(info); | |
1564 | ||
1565 | memset(&iwe, 0, sizeof(iwe)); | |
1566 | iwe.cmd = SIOCGIWRATE; | |
1567 | /* Those two flags are ignored... */ | |
1568 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1569 | ||
1570 | for (i = 0; i < ie[1]; i++) { | |
1571 | iwe.u.bitrate.value = | |
1572 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 1573 | tmp = p; |
2a519311 | 1574 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
1575 | end_buf, &iwe, |
1576 | IW_EV_PARAM_LEN); | |
1577 | if (p == tmp) { | |
1578 | current_ev = ERR_PTR(-E2BIG); | |
1579 | goto unlock; | |
1580 | } | |
2a519311 JB |
1581 | } |
1582 | current_ev = p; | |
1583 | break; | |
1584 | } | |
1585 | rem -= ie[1] + 2; | |
1586 | ie += ie[1] + 2; | |
1587 | } | |
1588 | ||
f64f9e71 JP |
1589 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1590 | ismesh) { | |
2a519311 JB |
1591 | memset(&iwe, 0, sizeof(iwe)); |
1592 | iwe.cmd = SIOCGIWMODE; | |
1593 | if (ismesh) | |
1594 | iwe.u.mode = IW_MODE_MESH; | |
1595 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1596 | iwe.u.mode = IW_MODE_MASTER; | |
1597 | else | |
1598 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
1599 | current_ev = iwe_stream_add_event_check(info, current_ev, |
1600 | end_buf, &iwe, | |
1601 | IW_EV_UINT_LEN); | |
1602 | if (IS_ERR(current_ev)) | |
1603 | goto unlock; | |
2a519311 JB |
1604 | } |
1605 | ||
76a70e9c JM |
1606 | memset(&iwe, 0, sizeof(iwe)); |
1607 | iwe.cmd = IWEVCUSTOM; | |
1608 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); | |
1609 | iwe.u.data.length = strlen(buf); | |
1610 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, | |
1611 | &iwe, buf); | |
1612 | if (IS_ERR(current_ev)) | |
1613 | goto unlock; | |
1614 | memset(&iwe, 0, sizeof(iwe)); | |
1615 | iwe.cmd = IWEVCUSTOM; | |
1616 | sprintf(buf, " Last beacon: %ums ago", | |
1617 | elapsed_jiffies_msecs(bss->ts)); | |
1618 | iwe.u.data.length = strlen(buf); | |
1619 | current_ev = iwe_stream_add_point_check(info, current_ev, | |
1620 | end_buf, &iwe, buf); | |
1621 | if (IS_ERR(current_ev)) | |
1622 | goto unlock; | |
1623 | ||
1624 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
1625 | ||
1626 | unlock: | |
9caf0364 | 1627 | rcu_read_unlock(); |
2a519311 JB |
1628 | return current_ev; |
1629 | } | |
1630 | ||
1631 | ||
1b8ec87a | 1632 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
1633 | struct iw_request_info *info, |
1634 | char *buf, size_t len) | |
1635 | { | |
1636 | char *current_ev = buf; | |
1637 | char *end_buf = buf + len; | |
1638 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 1639 | int err = 0; |
2a519311 | 1640 | |
1b8ec87a ZG |
1641 | spin_lock_bh(&rdev->bss_lock); |
1642 | cfg80211_bss_expire(rdev); | |
2a519311 | 1643 | |
1b8ec87a | 1644 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 1645 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
1646 | err = -E2BIG; |
1647 | break; | |
2a519311 | 1648 | } |
1b8ec87a | 1649 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 1650 | current_ev, end_buf); |
76a70e9c JM |
1651 | if (IS_ERR(current_ev)) { |
1652 | err = PTR_ERR(current_ev); | |
1653 | break; | |
1654 | } | |
2a519311 | 1655 | } |
1b8ec87a | 1656 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
1657 | |
1658 | if (err) | |
1659 | return err; | |
2a519311 JB |
1660 | return current_ev - buf; |
1661 | } | |
1662 | ||
1663 | ||
1664 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1665 | struct iw_request_info *info, | |
1666 | struct iw_point *data, char *extra) | |
1667 | { | |
1668 | struct cfg80211_registered_device *rdev; | |
1669 | int res; | |
1670 | ||
1671 | if (!netif_running(dev)) | |
1672 | return -ENETDOWN; | |
1673 | ||
463d0183 | 1674 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1675 | |
1676 | if (IS_ERR(rdev)) | |
1677 | return PTR_ERR(rdev); | |
1678 | ||
f9d15d16 | 1679 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 1680 | return -EAGAIN; |
2a519311 JB |
1681 | |
1682 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1683 | data->length = 0; | |
1684 | if (res >= 0) { | |
1685 | data->length = res; | |
1686 | res = 0; | |
1687 | } | |
1688 | ||
2a519311 JB |
1689 | return res; |
1690 | } | |
2afe38d1 | 1691 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 1692 | #endif |