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 |
2a519311 JB |
6 | */ |
7 | #include <linux/kernel.h> | |
5a0e3ad6 | 8 | #include <linux/slab.h> |
2a519311 JB |
9 | #include <linux/module.h> |
10 | #include <linux/netdevice.h> | |
11 | #include <linux/wireless.h> | |
12 | #include <linux/nl80211.h> | |
13 | #include <linux/etherdevice.h> | |
14 | #include <net/arp.h> | |
15 | #include <net/cfg80211.h> | |
262eb9b2 | 16 | #include <net/cfg80211-wext.h> |
2a519311 JB |
17 | #include <net/iw_handler.h> |
18 | #include "core.h" | |
19 | #include "nl80211.h" | |
a9a11622 | 20 | #include "wext-compat.h" |
e35e4d28 | 21 | #include "rdev-ops.h" |
2a519311 | 22 | |
776b3580 JB |
23 | /** |
24 | * DOC: BSS tree/list structure | |
25 | * | |
26 | * At the top level, the BSS list is kept in both a list in each | |
27 | * registered device (@bss_list) as well as an RB-tree for faster | |
28 | * lookup. In the RB-tree, entries can be looked up using their | |
29 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID | |
30 | * for other BSSes. | |
31 | * | |
32 | * Due to the possibility of hidden SSIDs, there's a second level | |
33 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. | |
34 | * The hidden_list connects all BSSes belonging to a single AP | |
35 | * that has a hidden SSID, and connects beacon and probe response | |
36 | * entries. For a probe response entry for a hidden SSID, the | |
37 | * hidden_beacon_bss pointer points to the BSS struct holding the | |
38 | * beacon's information. | |
39 | * | |
40 | * Reference counting is done for all these references except for | |
41 | * the hidden_list, so that a beacon BSS struct that is otherwise | |
42 | * not referenced has one reference for being on the bss_list and | |
43 | * one for each probe response entry that points to it using the | |
44 | * hidden_beacon_bss pointer. When a BSS struct that has such a | |
45 | * pointer is get/put, the refcount update is also propagated to | |
46 | * the referenced struct, this ensure that it cannot get removed | |
47 | * while somebody is using the probe response version. | |
48 | * | |
49 | * Note that the hidden_beacon_bss pointer never changes, due to | |
50 | * the reference counting. Therefore, no locking is needed for | |
51 | * it. | |
52 | * | |
53 | * Also note that the hidden_beacon_bss pointer is only relevant | |
54 | * if the driver uses something other than the IEs, e.g. private | |
55 | * data stored stored in the BSS struct, since the beacon IEs are | |
56 | * also linked into the probe response struct. | |
57 | */ | |
58 | ||
f9616e0f | 59 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 60 | |
776b3580 | 61 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 62 | { |
9caf0364 | 63 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
64 | |
65 | if (WARN_ON(atomic_read(&bss->hold))) | |
66 | return; | |
67 | ||
9caf0364 | 68 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 69 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
70 | kfree_rcu(ies, rcu_head); |
71 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
72 | if (ies) | |
73 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 74 | |
776b3580 JB |
75 | /* |
76 | * This happens when the module is removed, it doesn't | |
77 | * really matter any more save for completeness | |
78 | */ | |
79 | if (!list_empty(&bss->hidden_list)) | |
80 | list_del(&bss->hidden_list); | |
81 | ||
e8e27c66 AK |
82 | kfree(bss); |
83 | } | |
84 | ||
1b8ec87a | 85 | static inline void bss_ref_get(struct cfg80211_registered_device *rdev, |
776b3580 | 86 | struct cfg80211_internal_bss *bss) |
0532d4f1 | 87 | { |
1b8ec87a | 88 | lockdep_assert_held(&rdev->bss_lock); |
776b3580 JB |
89 | |
90 | bss->refcount++; | |
91 | if (bss->pub.hidden_beacon_bss) { | |
92 | bss = container_of(bss->pub.hidden_beacon_bss, | |
93 | struct cfg80211_internal_bss, | |
94 | pub); | |
95 | bss->refcount++; | |
96 | } | |
0532d4f1 JB |
97 | } |
98 | ||
1b8ec87a | 99 | static inline void bss_ref_put(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 | if (bss->pub.hidden_beacon_bss) { | |
105 | struct cfg80211_internal_bss *hbss; | |
106 | hbss = container_of(bss->pub.hidden_beacon_bss, | |
107 | struct cfg80211_internal_bss, | |
108 | pub); | |
109 | hbss->refcount--; | |
110 | if (hbss->refcount == 0) | |
111 | bss_free(hbss); | |
112 | } | |
113 | bss->refcount--; | |
114 | if (bss->refcount == 0) | |
115 | bss_free(bss); | |
0532d4f1 JB |
116 | } |
117 | ||
1b8ec87a | 118 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, |
e8e27c66 AK |
119 | struct cfg80211_internal_bss *bss) |
120 | { | |
1b8ec87a | 121 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 122 | |
776b3580 JB |
123 | if (!list_empty(&bss->hidden_list)) { |
124 | /* | |
125 | * don't remove the beacon entry if it has | |
126 | * probe responses associated with it | |
127 | */ | |
128 | if (!bss->pub.hidden_beacon_bss) | |
129 | return false; | |
130 | /* | |
131 | * if it's a probe response entry break its | |
132 | * link to the other entries in the group | |
133 | */ | |
134 | list_del_init(&bss->hidden_list); | |
135 | } | |
136 | ||
e8e27c66 | 137 | list_del_init(&bss->list); |
1b8ec87a ZG |
138 | rb_erase(&bss->rbn, &rdev->bss_tree); |
139 | bss_ref_put(rdev, bss); | |
776b3580 | 140 | return true; |
e8e27c66 AK |
141 | } |
142 | ||
1b8ec87a | 143 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, |
15d6030b SL |
144 | unsigned long expire_time) |
145 | { | |
146 | struct cfg80211_internal_bss *bss, *tmp; | |
147 | bool expired = false; | |
148 | ||
1b8ec87a | 149 | lockdep_assert_held(&rdev->bss_lock); |
4b1af479 | 150 | |
1b8ec87a | 151 | list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { |
15d6030b SL |
152 | if (atomic_read(&bss->hold)) |
153 | continue; | |
154 | if (!time_after(expire_time, bss->ts)) | |
155 | continue; | |
156 | ||
1b8ec87a | 157 | if (__cfg80211_unlink_bss(rdev, bss)) |
776b3580 | 158 | expired = true; |
15d6030b SL |
159 | } |
160 | ||
161 | if (expired) | |
1b8ec87a | 162 | rdev->bss_generation++; |
15d6030b SL |
163 | } |
164 | ||
f9d15d16 JB |
165 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, |
166 | bool send_message) | |
2a519311 | 167 | { |
667503dd | 168 | struct cfg80211_scan_request *request; |
fd014284 | 169 | struct wireless_dev *wdev; |
f9d15d16 | 170 | struct sk_buff *msg; |
3d23e349 | 171 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
172 | union iwreq_data wrqu; |
173 | #endif | |
174 | ||
5fe231e8 | 175 | ASSERT_RTNL(); |
01a0ac41 | 176 | |
f9d15d16 JB |
177 | if (rdev->scan_msg) { |
178 | nl80211_send_scan_result(rdev, rdev->scan_msg); | |
179 | rdev->scan_msg = NULL; | |
180 | return; | |
181 | } | |
667503dd | 182 | |
f9d15d16 | 183 | request = rdev->scan_req; |
01a0ac41 JB |
184 | if (!request) |
185 | return; | |
186 | ||
fd014284 | 187 | wdev = request->wdev; |
2a519311 | 188 | |
6829c878 JB |
189 | /* |
190 | * This must be before sending the other events! | |
191 | * Otherwise, wpa_supplicant gets completely confused with | |
192 | * wext events. | |
193 | */ | |
fd014284 JB |
194 | if (wdev->netdev) |
195 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 196 | |
f9d15d16 JB |
197 | if (!request->aborted && |
198 | request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
199 | /* flush entries from previous scans */ | |
200 | spin_lock_bh(&rdev->bss_lock); | |
201 | __cfg80211_bss_expire(rdev, request->scan_start); | |
202 | spin_unlock_bh(&rdev->bss_lock); | |
15d6030b | 203 | } |
2a519311 | 204 | |
f9d15d16 JB |
205 | msg = nl80211_build_scan_msg(rdev, wdev, request->aborted); |
206 | ||
3d23e349 | 207 | #ifdef CONFIG_CFG80211_WEXT |
fd014284 | 208 | if (wdev->netdev && !request->aborted) { |
2a519311 JB |
209 | memset(&wrqu, 0, sizeof(wrqu)); |
210 | ||
fd014284 | 211 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
212 | } |
213 | #endif | |
214 | ||
fd014284 JB |
215 | if (wdev->netdev) |
216 | dev_put(wdev->netdev); | |
2a519311 | 217 | |
36e6fea8 | 218 | rdev->scan_req = NULL; |
4a58e7c3 | 219 | kfree(request); |
f9d15d16 JB |
220 | |
221 | if (!send_message) | |
222 | rdev->scan_msg = msg; | |
223 | else | |
224 | nl80211_send_scan_result(rdev, msg); | |
2a519311 | 225 | } |
667503dd | 226 | |
36e6fea8 JB |
227 | void __cfg80211_scan_done(struct work_struct *wk) |
228 | { | |
229 | struct cfg80211_registered_device *rdev; | |
230 | ||
231 | rdev = container_of(wk, struct cfg80211_registered_device, | |
232 | scan_done_wk); | |
233 | ||
5fe231e8 | 234 | rtnl_lock(); |
f9d15d16 | 235 | ___cfg80211_scan_done(rdev, true); |
5fe231e8 | 236 | rtnl_unlock(); |
36e6fea8 JB |
237 | } |
238 | ||
667503dd JB |
239 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
240 | { | |
4ee3e063 | 241 | trace_cfg80211_scan_done(request, aborted); |
f26cbf40 | 242 | WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req); |
667503dd JB |
243 | |
244 | request->aborted = aborted; | |
5fe231e8 | 245 | request->notified = true; |
f26cbf40 | 246 | queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk); |
667503dd | 247 | } |
2a519311 JB |
248 | EXPORT_SYMBOL(cfg80211_scan_done); |
249 | ||
807f8a8c LC |
250 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
251 | { | |
252 | struct cfg80211_registered_device *rdev; | |
15d6030b | 253 | struct cfg80211_sched_scan_request *request; |
807f8a8c LC |
254 | |
255 | rdev = container_of(wk, struct cfg80211_registered_device, | |
256 | sched_scan_results_wk); | |
257 | ||
5fe231e8 | 258 | rtnl_lock(); |
807f8a8c | 259 | |
31a60ed1 | 260 | request = rtnl_dereference(rdev->sched_scan_req); |
79845c66 | 261 | |
807f8a8c | 262 | /* we don't have sched_scan_req anymore if the scan is stopping */ |
15d6030b SL |
263 | if (request) { |
264 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
265 | /* flush entries from previous scans */ | |
266 | spin_lock_bh(&rdev->bss_lock); | |
267 | __cfg80211_bss_expire(rdev, request->scan_start); | |
268 | spin_unlock_bh(&rdev->bss_lock); | |
3b06d277 | 269 | request->scan_start = jiffies; |
15d6030b SL |
270 | } |
271 | nl80211_send_sched_scan_results(rdev, request->dev); | |
272 | } | |
807f8a8c | 273 | |
5fe231e8 | 274 | rtnl_unlock(); |
807f8a8c LC |
275 | } |
276 | ||
277 | void cfg80211_sched_scan_results(struct wiphy *wiphy) | |
278 | { | |
4ee3e063 | 279 | trace_cfg80211_sched_scan_results(wiphy); |
807f8a8c | 280 | /* ignore if we're not scanning */ |
31a60ed1 JR |
281 | |
282 | if (rcu_access_pointer(wiphy_to_rdev(wiphy)->sched_scan_req)) | |
807f8a8c | 283 | queue_work(cfg80211_wq, |
f26cbf40 | 284 | &wiphy_to_rdev(wiphy)->sched_scan_results_wk); |
807f8a8c LC |
285 | } |
286 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
287 | ||
792e6aa7 | 288 | void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy) |
807f8a8c | 289 | { |
f26cbf40 | 290 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
807f8a8c | 291 | |
792e6aa7 EP |
292 | ASSERT_RTNL(); |
293 | ||
4ee3e063 BL |
294 | trace_cfg80211_sched_scan_stopped(wiphy); |
295 | ||
807f8a8c | 296 | __cfg80211_stop_sched_scan(rdev, true); |
792e6aa7 EP |
297 | } |
298 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl); | |
299 | ||
300 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) | |
301 | { | |
302 | rtnl_lock(); | |
303 | cfg80211_sched_scan_stopped_rtnl(wiphy); | |
5fe231e8 | 304 | rtnl_unlock(); |
807f8a8c | 305 | } |
807f8a8c LC |
306 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
307 | ||
308 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, | |
309 | bool driver_initiated) | |
310 | { | |
31a60ed1 | 311 | struct cfg80211_sched_scan_request *sched_scan_req; |
807f8a8c LC |
312 | struct net_device *dev; |
313 | ||
5fe231e8 | 314 | ASSERT_RTNL(); |
807f8a8c LC |
315 | |
316 | if (!rdev->sched_scan_req) | |
1a84ff75 | 317 | return -ENOENT; |
807f8a8c | 318 | |
31a60ed1 JR |
319 | sched_scan_req = rtnl_dereference(rdev->sched_scan_req); |
320 | dev = sched_scan_req->dev; | |
807f8a8c | 321 | |
85a9994a | 322 | if (!driver_initiated) { |
e35e4d28 | 323 | int err = rdev_sched_scan_stop(rdev, dev); |
85a9994a LC |
324 | if (err) |
325 | return err; | |
326 | } | |
807f8a8c LC |
327 | |
328 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); | |
329 | ||
31a60ed1 JR |
330 | RCU_INIT_POINTER(rdev->sched_scan_req, NULL); |
331 | kfree_rcu(sched_scan_req, rcu_head); | |
807f8a8c | 332 | |
3b4670ff | 333 | return 0; |
807f8a8c LC |
334 | } |
335 | ||
1b8ec87a | 336 | void cfg80211_bss_age(struct cfg80211_registered_device *rdev, |
cb3a8eec DW |
337 | unsigned long age_secs) |
338 | { | |
339 | struct cfg80211_internal_bss *bss; | |
340 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
341 | ||
1b8ec87a ZG |
342 | spin_lock_bh(&rdev->bss_lock); |
343 | list_for_each_entry(bss, &rdev->bss_list, list) | |
cb3a8eec | 344 | bss->ts -= age_jiffies; |
1b8ec87a | 345 | spin_unlock_bh(&rdev->bss_lock); |
cb3a8eec DW |
346 | } |
347 | ||
1b8ec87a | 348 | void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) |
2a519311 | 349 | { |
1b8ec87a | 350 | __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
351 | } |
352 | ||
c21dbf92 | 353 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
2a519311 | 354 | { |
c21dbf92 | 355 | while (len > 2 && ies[0] != eid) { |
2a519311 JB |
356 | len -= ies[1] + 2; |
357 | ies += ies[1] + 2; | |
358 | } | |
359 | if (len < 2) | |
360 | return NULL; | |
361 | if (len < 2 + ies[1]) | |
362 | return NULL; | |
363 | return ies; | |
364 | } | |
c21dbf92 | 365 | EXPORT_SYMBOL(cfg80211_find_ie); |
2a519311 | 366 | |
0c28ec58 EP |
367 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, |
368 | const u8 *ies, int len) | |
369 | { | |
370 | struct ieee80211_vendor_ie *ie; | |
371 | const u8 *pos = ies, *end = ies + len; | |
372 | int ie_oui; | |
373 | ||
374 | while (pos < end) { | |
375 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, | |
376 | end - pos); | |
377 | if (!pos) | |
378 | return NULL; | |
379 | ||
0c28ec58 | 380 | ie = (struct ieee80211_vendor_ie *)pos; |
6719429d LC |
381 | |
382 | /* make sure we can access ie->len */ | |
383 | BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1); | |
384 | ||
385 | if (ie->len < sizeof(*ie)) | |
386 | goto cont; | |
387 | ||
0c28ec58 EP |
388 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; |
389 | if (ie_oui == oui && ie->oui_type == oui_type) | |
390 | return pos; | |
6719429d | 391 | cont: |
0c28ec58 EP |
392 | pos += 2 + ie->len; |
393 | } | |
394 | return NULL; | |
395 | } | |
396 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
397 | ||
915de2ff | 398 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
2a519311 JB |
399 | const u8 *ssid, size_t ssid_len) |
400 | { | |
9caf0364 | 401 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
402 | const u8 *ssidie; |
403 | ||
ac422d3c | 404 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
405 | return false; |
406 | ||
79420f09 JB |
407 | if (!ssid) |
408 | return true; | |
409 | ||
9caf0364 JB |
410 | ies = rcu_access_pointer(a->ies); |
411 | if (!ies) | |
412 | return false; | |
413 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
2a519311 JB |
414 | if (!ssidie) |
415 | return false; | |
416 | if (ssidie[1] != ssid_len) | |
417 | return false; | |
418 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
419 | } | |
420 | ||
4593c4cb JB |
421 | /** |
422 | * enum bss_compare_mode - BSS compare mode | |
423 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
424 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
425 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
426 | */ | |
427 | enum bss_compare_mode { | |
428 | BSS_CMP_REGULAR, | |
429 | BSS_CMP_HIDE_ZLEN, | |
430 | BSS_CMP_HIDE_NUL, | |
431 | }; | |
432 | ||
dd9dfb9f | 433 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 434 | struct cfg80211_bss *b, |
4593c4cb | 435 | enum bss_compare_mode mode) |
dd9dfb9f | 436 | { |
9caf0364 | 437 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
438 | const u8 *ie1 = NULL; |
439 | const u8 *ie2 = NULL; | |
5622f5bb | 440 | int i, r; |
dd9dfb9f | 441 | |
3af6341c JB |
442 | if (a->channel != b->channel) |
443 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 444 | |
9caf0364 JB |
445 | a_ies = rcu_access_pointer(a->ies); |
446 | if (!a_ies) | |
447 | return -1; | |
448 | b_ies = rcu_access_pointer(b->ies); | |
449 | if (!b_ies) | |
450 | return 1; | |
451 | ||
3af6341c JB |
452 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
453 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
454 | a_ies->data, a_ies->len); | |
455 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
456 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
457 | b_ies->data, b_ies->len); | |
458 | if (ie1 && ie2) { | |
459 | int mesh_id_cmp; | |
460 | ||
461 | if (ie1[1] == ie2[1]) | |
462 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
463 | else | |
464 | mesh_id_cmp = ie2[1] - ie1[1]; | |
465 | ||
466 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
467 | a_ies->data, a_ies->len); | |
468 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
469 | b_ies->data, b_ies->len); | |
470 | if (ie1 && ie2) { | |
471 | if (mesh_id_cmp) | |
472 | return mesh_id_cmp; | |
473 | if (ie1[1] != ie2[1]) | |
474 | return ie2[1] - ie1[1]; | |
475 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
476 | } | |
477 | } | |
478 | ||
3af6341c JB |
479 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); |
480 | if (r) | |
481 | return r; | |
482 | ||
9caf0364 JB |
483 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
484 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 485 | |
5622f5bb JB |
486 | if (!ie1 && !ie2) |
487 | return 0; | |
488 | ||
f94f8b16 | 489 | /* |
5622f5bb JB |
490 | * Note that with "hide_ssid", the function returns a match if |
491 | * the already-present BSS ("b") is a hidden SSID beacon for | |
492 | * the new BSS ("a"). | |
f94f8b16 | 493 | */ |
dd9dfb9f DT |
494 | |
495 | /* sort missing IE before (left of) present IE */ | |
496 | if (!ie1) | |
497 | return -1; | |
498 | if (!ie2) | |
499 | return 1; | |
500 | ||
4593c4cb JB |
501 | switch (mode) { |
502 | case BSS_CMP_HIDE_ZLEN: | |
503 | /* | |
504 | * In ZLEN mode we assume the BSS entry we're | |
505 | * looking for has a zero-length SSID. So if | |
506 | * the one we're looking at right now has that, | |
507 | * return 0. Otherwise, return the difference | |
508 | * in length, but since we're looking for the | |
509 | * 0-length it's really equivalent to returning | |
510 | * the length of the one we're looking at. | |
511 | * | |
512 | * No content comparison is needed as we assume | |
513 | * the content length is zero. | |
514 | */ | |
515 | return ie2[1]; | |
516 | case BSS_CMP_REGULAR: | |
517 | default: | |
518 | /* sort by length first, then by contents */ | |
519 | if (ie1[1] != ie2[1]) | |
520 | return ie2[1] - ie1[1]; | |
5622f5bb | 521 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
522 | case BSS_CMP_HIDE_NUL: |
523 | if (ie1[1] != ie2[1]) | |
524 | return ie2[1] - ie1[1]; | |
525 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
526 | for (i = 0; i < ie2[1]; i++) | |
527 | if (ie2[i + 2]) | |
528 | return -1; | |
529 | return 0; | |
530 | } | |
dd9dfb9f DT |
531 | } |
532 | ||
6eb18137 DL |
533 | static bool cfg80211_bss_type_match(u16 capability, |
534 | enum ieee80211_band band, | |
535 | enum ieee80211_bss_type bss_type) | |
536 | { | |
537 | bool ret = true; | |
538 | u16 mask, val; | |
539 | ||
540 | if (bss_type == IEEE80211_BSS_TYPE_ANY) | |
541 | return ret; | |
542 | ||
543 | if (band == IEEE80211_BAND_60GHZ) { | |
544 | mask = WLAN_CAPABILITY_DMG_TYPE_MASK; | |
545 | switch (bss_type) { | |
546 | case IEEE80211_BSS_TYPE_ESS: | |
547 | val = WLAN_CAPABILITY_DMG_TYPE_AP; | |
548 | break; | |
549 | case IEEE80211_BSS_TYPE_PBSS: | |
550 | val = WLAN_CAPABILITY_DMG_TYPE_PBSS; | |
551 | break; | |
552 | case IEEE80211_BSS_TYPE_IBSS: | |
553 | val = WLAN_CAPABILITY_DMG_TYPE_IBSS; | |
554 | break; | |
555 | default: | |
556 | return false; | |
557 | } | |
558 | } else { | |
559 | mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; | |
560 | switch (bss_type) { | |
561 | case IEEE80211_BSS_TYPE_ESS: | |
562 | val = WLAN_CAPABILITY_ESS; | |
563 | break; | |
564 | case IEEE80211_BSS_TYPE_IBSS: | |
565 | val = WLAN_CAPABILITY_IBSS; | |
566 | break; | |
567 | case IEEE80211_BSS_TYPE_MBSS: | |
568 | val = 0; | |
569 | break; | |
570 | default: | |
571 | return false; | |
572 | } | |
573 | } | |
574 | ||
575 | ret = ((capability & mask) == val); | |
576 | return ret; | |
577 | } | |
578 | ||
0e3a39b5 | 579 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 JB |
580 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
581 | struct ieee80211_channel *channel, | |
582 | const u8 *bssid, | |
79420f09 | 583 | const u8 *ssid, size_t ssid_len, |
6eb18137 DL |
584 | enum ieee80211_bss_type bss_type, |
585 | enum ieee80211_privacy privacy) | |
2a519311 | 586 | { |
f26cbf40 | 587 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 | 588 | struct cfg80211_internal_bss *bss, *res = NULL; |
ccb6c136 | 589 | unsigned long now = jiffies; |
6eb18137 | 590 | int bss_privacy; |
2a519311 | 591 | |
6eb18137 DL |
592 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, |
593 | privacy); | |
4ee3e063 | 594 | |
1b8ec87a | 595 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 596 | |
1b8ec87a | 597 | list_for_each_entry(bss, &rdev->bss_list, list) { |
6eb18137 DL |
598 | if (!cfg80211_bss_type_match(bss->pub.capability, |
599 | bss->pub.channel->band, bss_type)) | |
600 | continue; | |
601 | ||
602 | bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); | |
603 | if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || | |
604 | (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) | |
79420f09 | 605 | continue; |
2a519311 JB |
606 | if (channel && bss->pub.channel != channel) |
607 | continue; | |
c14a7400 JB |
608 | if (!is_valid_ether_addr(bss->pub.bssid)) |
609 | continue; | |
ccb6c136 JB |
610 | /* Don't get expired BSS structs */ |
611 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
612 | !atomic_read(&bss->hold)) | |
613 | continue; | |
2a519311 JB |
614 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
615 | res = bss; | |
1b8ec87a | 616 | bss_ref_get(rdev, res); |
2a519311 JB |
617 | break; |
618 | } | |
619 | } | |
620 | ||
1b8ec87a | 621 | spin_unlock_bh(&rdev->bss_lock); |
2a519311 JB |
622 | if (!res) |
623 | return NULL; | |
4ee3e063 | 624 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
625 | return &res->pub; |
626 | } | |
627 | EXPORT_SYMBOL(cfg80211_get_bss); | |
628 | ||
1b8ec87a | 629 | static void rb_insert_bss(struct cfg80211_registered_device *rdev, |
2a519311 JB |
630 | struct cfg80211_internal_bss *bss) |
631 | { | |
1b8ec87a | 632 | struct rb_node **p = &rdev->bss_tree.rb_node; |
2a519311 JB |
633 | struct rb_node *parent = NULL; |
634 | struct cfg80211_internal_bss *tbss; | |
635 | int cmp; | |
636 | ||
637 | while (*p) { | |
638 | parent = *p; | |
639 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
640 | ||
4593c4cb | 641 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
642 | |
643 | if (WARN_ON(!cmp)) { | |
644 | /* will sort of leak this BSS */ | |
645 | return; | |
646 | } | |
647 | ||
648 | if (cmp < 0) | |
649 | p = &(*p)->rb_left; | |
650 | else | |
651 | p = &(*p)->rb_right; | |
652 | } | |
653 | ||
654 | rb_link_node(&bss->rbn, parent, p); | |
1b8ec87a | 655 | rb_insert_color(&bss->rbn, &rdev->bss_tree); |
2a519311 JB |
656 | } |
657 | ||
658 | static struct cfg80211_internal_bss * | |
1b8ec87a | 659 | rb_find_bss(struct cfg80211_registered_device *rdev, |
5622f5bb | 660 | struct cfg80211_internal_bss *res, |
4593c4cb | 661 | enum bss_compare_mode mode) |
dd9dfb9f | 662 | { |
1b8ec87a | 663 | struct rb_node *n = rdev->bss_tree.rb_node; |
dd9dfb9f DT |
664 | struct cfg80211_internal_bss *bss; |
665 | int r; | |
666 | ||
667 | while (n) { | |
668 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 669 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
670 | |
671 | if (r == 0) | |
672 | return bss; | |
673 | else if (r < 0) | |
674 | n = n->rb_left; | |
675 | else | |
676 | n = n->rb_right; | |
677 | } | |
678 | ||
679 | return NULL; | |
680 | } | |
681 | ||
1b8ec87a | 682 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, |
776b3580 | 683 | struct cfg80211_internal_bss *new) |
dd9dfb9f | 684 | { |
9caf0364 | 685 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
686 | struct cfg80211_internal_bss *bss; |
687 | const u8 *ie; | |
688 | int i, ssidlen; | |
689 | u8 fold = 0; | |
9caf0364 | 690 | |
776b3580 | 691 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 692 | if (WARN_ON(!ies)) |
776b3580 | 693 | return false; |
dd9dfb9f | 694 | |
776b3580 JB |
695 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
696 | if (!ie) { | |
697 | /* nothing to do */ | |
698 | return true; | |
699 | } | |
700 | ||
701 | ssidlen = ie[1]; | |
702 | for (i = 0; i < ssidlen; i++) | |
703 | fold |= ie[2 + i]; | |
704 | ||
705 | if (fold) { | |
706 | /* not a hidden SSID */ | |
707 | return true; | |
708 | } | |
709 | ||
710 | /* This is the bad part ... */ | |
711 | ||
1b8ec87a | 712 | list_for_each_entry(bss, &rdev->bss_list, list) { |
776b3580 JB |
713 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) |
714 | continue; | |
715 | if (bss->pub.channel != new->pub.channel) | |
716 | continue; | |
dcd6eac1 SW |
717 | if (bss->pub.scan_width != new->pub.scan_width) |
718 | continue; | |
776b3580 JB |
719 | if (rcu_access_pointer(bss->pub.beacon_ies)) |
720 | continue; | |
721 | ies = rcu_access_pointer(bss->pub.ies); | |
722 | if (!ies) | |
723 | continue; | |
724 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
725 | if (!ie) | |
726 | continue; | |
727 | if (ssidlen && ie[1] != ssidlen) | |
728 | continue; | |
776b3580 JB |
729 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) |
730 | continue; | |
731 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
732 | list_del(&bss->hidden_list); | |
733 | /* combine them */ | |
734 | list_add(&bss->hidden_list, &new->hidden_list); | |
735 | bss->pub.hidden_beacon_bss = &new->pub; | |
736 | new->refcount += bss->refcount; | |
737 | rcu_assign_pointer(bss->pub.beacon_ies, | |
738 | new->pub.beacon_ies); | |
739 | } | |
740 | ||
741 | return true; | |
dd9dfb9f DT |
742 | } |
743 | ||
0e3a39b5 | 744 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
2a519311 | 745 | static struct cfg80211_internal_bss * |
1b8ec87a | 746 | cfg80211_bss_update(struct cfg80211_registered_device *rdev, |
3afc2167 EG |
747 | struct cfg80211_internal_bss *tmp, |
748 | bool signal_valid) | |
2a519311 JB |
749 | { |
750 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 751 | |
9caf0364 | 752 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 753 | return NULL; |
2a519311 | 754 | |
9caf0364 | 755 | tmp->ts = jiffies; |
2a519311 | 756 | |
1b8ec87a | 757 | spin_lock_bh(&rdev->bss_lock); |
2a519311 | 758 | |
9caf0364 | 759 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
1b8ec87a | 760 | spin_unlock_bh(&rdev->bss_lock); |
9caf0364 JB |
761 | return NULL; |
762 | } | |
763 | ||
1b8ec87a | 764 | found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); |
2a519311 | 765 | |
cd1658f5 | 766 | if (found) { |
34a6eddb | 767 | /* Update IEs */ |
9caf0364 JB |
768 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
769 | const struct cfg80211_bss_ies *old; | |
770 | ||
771 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 772 | |
9caf0364 JB |
773 | rcu_assign_pointer(found->pub.proberesp_ies, |
774 | tmp->pub.proberesp_ies); | |
34a6eddb | 775 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
776 | rcu_assign_pointer(found->pub.ies, |
777 | tmp->pub.proberesp_ies); | |
778 | if (old) | |
779 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
780 | rcu_head); | |
781 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
9537f227 | 782 | const struct cfg80211_bss_ies *old; |
776b3580 JB |
783 | struct cfg80211_internal_bss *bss; |
784 | ||
785 | if (found->pub.hidden_beacon_bss && | |
786 | !list_empty(&found->hidden_list)) { | |
1345ee6a JB |
787 | const struct cfg80211_bss_ies *f; |
788 | ||
776b3580 JB |
789 | /* |
790 | * The found BSS struct is one of the probe | |
791 | * response members of a group, but we're | |
792 | * receiving a beacon (beacon_ies in the tmp | |
793 | * bss is used). This can only mean that the | |
794 | * AP changed its beacon from not having an | |
795 | * SSID to showing it, which is confusing so | |
796 | * drop this information. | |
797 | */ | |
1345ee6a JB |
798 | |
799 | f = rcu_access_pointer(tmp->pub.beacon_ies); | |
800 | kfree_rcu((struct cfg80211_bss_ies *)f, | |
801 | rcu_head); | |
776b3580 JB |
802 | goto drop; |
803 | } | |
915de2ff | 804 | |
9caf0364 | 805 | old = rcu_access_pointer(found->pub.beacon_ies); |
9caf0364 JB |
806 | |
807 | rcu_assign_pointer(found->pub.beacon_ies, | |
808 | tmp->pub.beacon_ies); | |
01123e23 SN |
809 | |
810 | /* Override IEs if they were from a beacon before */ | |
9537f227 | 811 | if (old == rcu_access_pointer(found->pub.ies)) |
9caf0364 JB |
812 | rcu_assign_pointer(found->pub.ies, |
813 | tmp->pub.beacon_ies); | |
cd1658f5 | 814 | |
776b3580 JB |
815 | /* Assign beacon IEs to all sub entries */ |
816 | list_for_each_entry(bss, &found->hidden_list, | |
817 | hidden_list) { | |
818 | const struct cfg80211_bss_ies *ies; | |
819 | ||
820 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
821 | WARN_ON(ies != old); | |
822 | ||
823 | rcu_assign_pointer(bss->pub.beacon_ies, | |
824 | tmp->pub.beacon_ies); | |
825 | } | |
826 | ||
9caf0364 JB |
827 | if (old) |
828 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
829 | rcu_head); | |
830 | } | |
1345ee6a JB |
831 | |
832 | found->pub.beacon_interval = tmp->pub.beacon_interval; | |
3afc2167 EG |
833 | /* |
834 | * don't update the signal if beacon was heard on | |
835 | * adjacent channel. | |
836 | */ | |
837 | if (signal_valid) | |
838 | found->pub.signal = tmp->pub.signal; | |
1345ee6a JB |
839 | found->pub.capability = tmp->pub.capability; |
840 | found->ts = tmp->ts; | |
6e19bc4b | 841 | found->ts_boottime = tmp->ts_boottime; |
2a519311 | 842 | } else { |
9caf0364 | 843 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 844 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 845 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 846 | |
9caf0364 JB |
847 | /* |
848 | * create a copy -- the "res" variable that is passed in | |
849 | * is allocated on the stack since it's not needed in the | |
850 | * more common case of an update | |
851 | */ | |
1b8ec87a | 852 | new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, |
9caf0364 JB |
853 | GFP_ATOMIC); |
854 | if (!new) { | |
855 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
856 | if (ies) | |
857 | kfree_rcu(ies, rcu_head); | |
858 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
859 | if (ies) | |
860 | kfree_rcu(ies, rcu_head); | |
776b3580 | 861 | goto drop; |
9caf0364 JB |
862 | } |
863 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
864 | new->refcount = 1; |
865 | INIT_LIST_HEAD(&new->hidden_list); | |
866 | ||
867 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
1b8ec87a | 868 | hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); |
776b3580 | 869 | if (!hidden) |
1b8ec87a | 870 | hidden = rb_find_bss(rdev, tmp, |
776b3580 JB |
871 | BSS_CMP_HIDE_NUL); |
872 | if (hidden) { | |
873 | new->pub.hidden_beacon_bss = &hidden->pub; | |
874 | list_add(&new->hidden_list, | |
875 | &hidden->hidden_list); | |
876 | hidden->refcount++; | |
877 | rcu_assign_pointer(new->pub.beacon_ies, | |
878 | hidden->pub.beacon_ies); | |
879 | } | |
880 | } else { | |
881 | /* | |
882 | * Ok so we found a beacon, and don't have an entry. If | |
883 | * it's a beacon with hidden SSID, we might be in for an | |
884 | * expensive search for any probe responses that should | |
885 | * be grouped with this beacon for updates ... | |
886 | */ | |
1b8ec87a | 887 | if (!cfg80211_combine_bsses(rdev, new)) { |
776b3580 JB |
888 | kfree(new); |
889 | goto drop; | |
890 | } | |
891 | } | |
892 | ||
1b8ec87a ZG |
893 | list_add_tail(&new->list, &rdev->bss_list); |
894 | rb_insert_bss(rdev, new); | |
9caf0364 | 895 | found = new; |
2a519311 JB |
896 | } |
897 | ||
1b8ec87a ZG |
898 | rdev->bss_generation++; |
899 | bss_ref_get(rdev, found); | |
900 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 | 901 | |
2a519311 | 902 | return found; |
776b3580 | 903 | drop: |
1b8ec87a | 904 | spin_unlock_bh(&rdev->bss_lock); |
776b3580 | 905 | return NULL; |
2a519311 JB |
906 | } |
907 | ||
0172bb75 JB |
908 | static struct ieee80211_channel * |
909 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
910 | struct ieee80211_channel *channel) | |
911 | { | |
912 | const u8 *tmp; | |
913 | u32 freq; | |
914 | int channel_number = -1; | |
915 | ||
916 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
917 | if (tmp && tmp[1] == 1) { | |
918 | channel_number = tmp[2]; | |
919 | } else { | |
920 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
921 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
922 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
923 | ||
924 | channel_number = htop->primary_chan; | |
925 | } | |
926 | } | |
927 | ||
928 | if (channel_number < 0) | |
929 | return channel; | |
930 | ||
931 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
932 | channel = ieee80211_get_channel(wiphy, freq); | |
933 | if (!channel) | |
934 | return NULL; | |
935 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
936 | return NULL; | |
937 | return channel; | |
938 | } | |
939 | ||
0e3a39b5 | 940 | /* Returned bss is reference counted and must be cleaned up appropriately. */ |
6e19bc4b DS |
941 | struct cfg80211_bss * |
942 | cfg80211_inform_bss_data(struct wiphy *wiphy, | |
943 | struct cfg80211_inform_bss *data, | |
944 | enum cfg80211_bss_frame_type ftype, | |
945 | const u8 *bssid, u64 tsf, u16 capability, | |
946 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
947 | gfp_t gfp) | |
06aa7afa | 948 | { |
9caf0364 | 949 | struct cfg80211_bss_ies *ies; |
3afc2167 | 950 | struct ieee80211_channel *channel; |
9caf0364 | 951 | struct cfg80211_internal_bss tmp = {}, *res; |
6eb18137 | 952 | int bss_type; |
67af9811 | 953 | bool signal_valid; |
06aa7afa JK |
954 | |
955 | if (WARN_ON(!wiphy)) | |
956 | return NULL; | |
957 | ||
22fe88d3 | 958 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 959 | (data->signal < 0 || data->signal > 100))) |
06aa7afa JK |
960 | return NULL; |
961 | ||
6e19bc4b | 962 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan); |
0172bb75 JB |
963 | if (!channel) |
964 | return NULL; | |
965 | ||
9caf0364 JB |
966 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
967 | tmp.pub.channel = channel; | |
6e19bc4b DS |
968 | tmp.pub.scan_width = data->scan_width; |
969 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
970 | tmp.pub.beacon_interval = beacon_interval; |
971 | tmp.pub.capability = capability; | |
6e19bc4b DS |
972 | tmp.ts_boottime = data->boottime_ns; |
973 | ||
34a6eddb | 974 | /* |
5bc8c1f2 | 975 | * If we do not know here whether the IEs are from a Beacon or Probe |
34a6eddb JM |
976 | * Response frame, we need to pick one of the options and only use it |
977 | * with the driver that does not provide the full Beacon/Probe Response | |
978 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 979 | * override the IEs pointer should we have received an earlier |
9caf0364 | 980 | * indication of Probe Response data. |
34a6eddb | 981 | */ |
0e227084 | 982 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 JB |
983 | if (!ies) |
984 | return NULL; | |
985 | ies->len = ielen; | |
8cef2c9d | 986 | ies->tsf = tsf; |
0e227084 | 987 | ies->from_beacon = false; |
9caf0364 | 988 | memcpy(ies->data, ie, ielen); |
06aa7afa | 989 | |
5bc8c1f2 JB |
990 | switch (ftype) { |
991 | case CFG80211_BSS_FTYPE_BEACON: | |
992 | ies->from_beacon = true; | |
993 | /* fall through to assign */ | |
994 | case CFG80211_BSS_FTYPE_UNKNOWN: | |
995 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
996 | break; | |
997 | case CFG80211_BSS_FTYPE_PRESP: | |
998 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
999 | break; | |
1000 | } | |
9caf0364 | 1001 | rcu_assign_pointer(tmp.pub.ies, ies); |
06aa7afa | 1002 | |
6e19bc4b | 1003 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1004 | wiphy->max_adj_channel_rssi_comp; |
1005 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
06aa7afa JK |
1006 | if (!res) |
1007 | return NULL; | |
1008 | ||
6eb18137 DL |
1009 | if (channel->band == IEEE80211_BAND_60GHZ) { |
1010 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; | |
1011 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1012 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1013 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1014 | } else { | |
1015 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1016 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1017 | } | |
06aa7afa | 1018 | |
4ee3e063 | 1019 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
1020 | /* cfg80211_bss_update gives us a referenced result */ |
1021 | return &res->pub; | |
1022 | } | |
6e19bc4b | 1023 | EXPORT_SYMBOL(cfg80211_inform_bss_data); |
06aa7afa | 1024 | |
6e19bc4b | 1025 | /* cfg80211_inform_bss_width_frame helper */ |
2a519311 | 1026 | struct cfg80211_bss * |
6e19bc4b DS |
1027 | cfg80211_inform_bss_frame_data(struct wiphy *wiphy, |
1028 | struct cfg80211_inform_bss *data, | |
1029 | struct ieee80211_mgmt *mgmt, size_t len, | |
1030 | gfp_t gfp) | |
1031 | ||
2a519311 | 1032 | { |
9caf0364 JB |
1033 | struct cfg80211_internal_bss tmp = {}, *res; |
1034 | struct cfg80211_bss_ies *ies; | |
3afc2167 | 1035 | struct ieee80211_channel *channel; |
67af9811 | 1036 | bool signal_valid; |
2a519311 JB |
1037 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
1038 | u.probe_resp.variable); | |
6eb18137 | 1039 | int bss_type; |
bef9bacc | 1040 | |
0172bb75 JB |
1041 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
1042 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
1043 | ||
6e19bc4b | 1044 | trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); |
4ee3e063 | 1045 | |
bef9bacc MK |
1046 | if (WARN_ON(!mgmt)) |
1047 | return NULL; | |
1048 | ||
1049 | if (WARN_ON(!wiphy)) | |
1050 | return NULL; | |
2a519311 | 1051 | |
22fe88d3 | 1052 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
6e19bc4b | 1053 | (data->signal < 0 || data->signal > 100))) |
2a519311 JB |
1054 | return NULL; |
1055 | ||
bef9bacc | 1056 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
1057 | return NULL; |
1058 | ||
0172bb75 | 1059 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
6e19bc4b | 1060 | ielen, data->chan); |
0172bb75 JB |
1061 | if (!channel) |
1062 | return NULL; | |
1063 | ||
0e227084 | 1064 | ies = kzalloc(sizeof(*ies) + ielen, gfp); |
9caf0364 | 1065 | if (!ies) |
2a519311 | 1066 | return NULL; |
9caf0364 | 1067 | ies->len = ielen; |
8cef2c9d | 1068 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
0e227084 | 1069 | ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); |
9caf0364 | 1070 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
2a519311 | 1071 | |
9caf0364 JB |
1072 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
1073 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
1074 | else | |
1075 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
1076 | rcu_assign_pointer(tmp.pub.ies, ies); | |
1077 | ||
1078 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); | |
1079 | tmp.pub.channel = channel; | |
6e19bc4b DS |
1080 | tmp.pub.scan_width = data->scan_width; |
1081 | tmp.pub.signal = data->signal; | |
9caf0364 JB |
1082 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
1083 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
6e19bc4b | 1084 | tmp.ts_boottime = data->boottime_ns; |
9caf0364 | 1085 | |
6e19bc4b | 1086 | signal_valid = abs(data->chan->center_freq - channel->center_freq) <= |
67af9811 EG |
1087 | wiphy->max_adj_channel_rssi_comp; |
1088 | res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid); | |
2a519311 JB |
1089 | if (!res) |
1090 | return NULL; | |
1091 | ||
6eb18137 DL |
1092 | if (channel->band == IEEE80211_BAND_60GHZ) { |
1093 | bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK; | |
1094 | if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || | |
1095 | bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) | |
1096 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1097 | } else { | |
1098 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
1099 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
1100 | } | |
e38f8a7a | 1101 | |
4ee3e063 | 1102 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
1103 | /* cfg80211_bss_update gives us a referenced result */ |
1104 | return &res->pub; | |
1105 | } | |
6e19bc4b | 1106 | EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); |
2a519311 | 1107 | |
5b112d3d | 1108 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 1109 | { |
f26cbf40 | 1110 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
4c0c0b75 JB |
1111 | struct cfg80211_internal_bss *bss; |
1112 | ||
1113 | if (!pub) | |
1114 | return; | |
1115 | ||
1116 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1117 | |
1b8ec87a ZG |
1118 | spin_lock_bh(&rdev->bss_lock); |
1119 | bss_ref_get(rdev, bss); | |
1120 | spin_unlock_bh(&rdev->bss_lock); | |
4c0c0b75 JB |
1121 | } |
1122 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
1123 | ||
5b112d3d | 1124 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 1125 | { |
f26cbf40 | 1126 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
2a519311 JB |
1127 | struct cfg80211_internal_bss *bss; |
1128 | ||
1129 | if (!pub) | |
1130 | return; | |
1131 | ||
1132 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 | 1133 | |
1b8ec87a ZG |
1134 | spin_lock_bh(&rdev->bss_lock); |
1135 | bss_ref_put(rdev, bss); | |
1136 | spin_unlock_bh(&rdev->bss_lock); | |
2a519311 JB |
1137 | } |
1138 | EXPORT_SYMBOL(cfg80211_put_bss); | |
1139 | ||
d491af19 JB |
1140 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1141 | { | |
f26cbf40 | 1142 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
d491af19 JB |
1143 | struct cfg80211_internal_bss *bss; |
1144 | ||
1145 | if (WARN_ON(!pub)) | |
1146 | return; | |
1147 | ||
1148 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
1149 | ||
1b8ec87a | 1150 | spin_lock_bh(&rdev->bss_lock); |
3207390a | 1151 | if (!list_empty(&bss->list)) { |
1b8ec87a ZG |
1152 | if (__cfg80211_unlink_bss(rdev, bss)) |
1153 | rdev->bss_generation++; | |
3207390a | 1154 | } |
1b8ec87a | 1155 | spin_unlock_bh(&rdev->bss_lock); |
d491af19 JB |
1156 | } |
1157 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
1158 | ||
3d23e349 | 1159 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
1160 | static struct cfg80211_registered_device * |
1161 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
1162 | { | |
5fe231e8 | 1163 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
1164 | struct net_device *dev; |
1165 | ||
5fe231e8 JB |
1166 | ASSERT_RTNL(); |
1167 | ||
9f419f38 JB |
1168 | dev = dev_get_by_index(net, ifindex); |
1169 | if (!dev) | |
5fe231e8 JB |
1170 | return ERR_PTR(-ENODEV); |
1171 | if (dev->ieee80211_ptr) | |
f26cbf40 | 1172 | rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 1173 | else |
9f419f38 JB |
1174 | rdev = ERR_PTR(-ENODEV); |
1175 | dev_put(dev); | |
9f419f38 JB |
1176 | return rdev; |
1177 | } | |
1178 | ||
2a519311 JB |
1179 | int cfg80211_wext_siwscan(struct net_device *dev, |
1180 | struct iw_request_info *info, | |
1181 | union iwreq_data *wrqu, char *extra) | |
1182 | { | |
1183 | struct cfg80211_registered_device *rdev; | |
1184 | struct wiphy *wiphy; | |
1185 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 1186 | struct cfg80211_scan_request *creq = NULL; |
2a519311 JB |
1187 | int i, err, n_channels = 0; |
1188 | enum ieee80211_band band; | |
1189 | ||
1190 | if (!netif_running(dev)) | |
1191 | return -ENETDOWN; | |
1192 | ||
b2e3abdc HS |
1193 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
1194 | wreq = (struct iw_scan_req *)extra; | |
1195 | ||
463d0183 | 1196 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1197 | |
1198 | if (IS_ERR(rdev)) | |
1199 | return PTR_ERR(rdev); | |
1200 | ||
f9d15d16 | 1201 | if (rdev->scan_req || rdev->scan_msg) { |
2a519311 JB |
1202 | err = -EBUSY; |
1203 | goto out; | |
1204 | } | |
1205 | ||
1206 | wiphy = &rdev->wiphy; | |
1207 | ||
b2e3abdc HS |
1208 | /* Determine number of channels, needed to allocate creq */ |
1209 | if (wreq && wreq->num_channels) | |
1210 | n_channels = wreq->num_channels; | |
bdfbec2d IP |
1211 | else |
1212 | n_channels = ieee80211_get_num_supported_channels(wiphy); | |
2a519311 JB |
1213 | |
1214 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1215 | n_channels * sizeof(void *), | |
1216 | GFP_ATOMIC); | |
1217 | if (!creq) { | |
1218 | err = -ENOMEM; | |
1219 | goto out; | |
1220 | } | |
1221 | ||
1222 | creq->wiphy = wiphy; | |
fd014284 | 1223 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1224 | /* SSIDs come after channels */ |
1225 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1226 | creq->n_channels = n_channels; |
1227 | creq->n_ssids = 1; | |
15d6030b | 1228 | creq->scan_start = jiffies; |
2a519311 | 1229 | |
b2e3abdc | 1230 | /* translate "Scan on frequencies" request */ |
2a519311 JB |
1231 | i = 0; |
1232 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1233 | int j; | |
584991dc | 1234 | |
2a519311 JB |
1235 | if (!wiphy->bands[band]) |
1236 | continue; | |
584991dc | 1237 | |
2a519311 | 1238 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1239 | /* ignore disabled channels */ |
1240 | if (wiphy->bands[band]->channels[j].flags & | |
1241 | IEEE80211_CHAN_DISABLED) | |
1242 | continue; | |
b2e3abdc HS |
1243 | |
1244 | /* If we have a wireless request structure and the | |
1245 | * wireless request specifies frequencies, then search | |
1246 | * for the matching hardware channel. | |
1247 | */ | |
1248 | if (wreq && wreq->num_channels) { | |
1249 | int k; | |
1250 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1251 | for (k = 0; k < wreq->num_channels; k++) { | |
96998e3a ZG |
1252 | struct iw_freq *freq = |
1253 | &wreq->channel_list[k]; | |
1254 | int wext_freq = | |
1255 | cfg80211_wext_freq(freq); | |
1256 | ||
b2e3abdc HS |
1257 | if (wext_freq == wiphy_freq) |
1258 | goto wext_freq_found; | |
1259 | } | |
1260 | goto wext_freq_not_found; | |
1261 | } | |
1262 | ||
1263 | wext_freq_found: | |
2a519311 JB |
1264 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1265 | i++; | |
b2e3abdc | 1266 | wext_freq_not_found: ; |
2a519311 JB |
1267 | } |
1268 | } | |
8862dc5f HS |
1269 | /* No channels found? */ |
1270 | if (!i) { | |
1271 | err = -EINVAL; | |
1272 | goto out; | |
1273 | } | |
2a519311 | 1274 | |
b2e3abdc HS |
1275 | /* Set real number of channels specified in creq->channels[] */ |
1276 | creq->n_channels = i; | |
2a519311 | 1277 | |
b2e3abdc HS |
1278 | /* translate "Scan for SSID" request */ |
1279 | if (wreq) { | |
2a519311 | 1280 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1281 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1282 | err = -EINVAL; | |
1283 | goto out; | |
1284 | } | |
2a519311 JB |
1285 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1286 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1287 | } | |
1288 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1289 | creq->n_ssids = 0; | |
1290 | } | |
1291 | ||
34850ab2 | 1292 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
a401d2bb JB |
1293 | if (wiphy->bands[i]) |
1294 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1295 | |
2a519311 | 1296 | rdev->scan_req = creq; |
e35e4d28 | 1297 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1298 | if (err) { |
1299 | rdev->scan_req = NULL; | |
65486c8b | 1300 | /* creq will be freed below */ |
463d0183 | 1301 | } else { |
fd014284 | 1302 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1303 | /* creq now owned by driver */ |
1304 | creq = NULL; | |
463d0183 JB |
1305 | dev_hold(dev); |
1306 | } | |
2a519311 | 1307 | out: |
65486c8b | 1308 | kfree(creq); |
2a519311 JB |
1309 | return err; |
1310 | } | |
2afe38d1 | 1311 | EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); |
2a519311 | 1312 | |
76a70e9c JM |
1313 | static char *ieee80211_scan_add_ies(struct iw_request_info *info, |
1314 | const struct cfg80211_bss_ies *ies, | |
1315 | char *current_ev, char *end_buf) | |
2a519311 | 1316 | { |
9caf0364 | 1317 | const u8 *pos, *end, *next; |
2a519311 JB |
1318 | struct iw_event iwe; |
1319 | ||
9caf0364 | 1320 | if (!ies) |
76a70e9c | 1321 | return current_ev; |
2a519311 JB |
1322 | |
1323 | /* | |
1324 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1325 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1326 | */ | |
9caf0364 JB |
1327 | pos = ies->data; |
1328 | end = pos + ies->len; | |
2a519311 JB |
1329 | |
1330 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1331 | next = pos + 2 + pos[1]; | |
1332 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1333 | next = next + 2 + next[1]; | |
1334 | ||
1335 | memset(&iwe, 0, sizeof(iwe)); | |
1336 | iwe.cmd = IWEVGENIE; | |
1337 | iwe.u.data.length = next - pos; | |
76a70e9c JM |
1338 | current_ev = iwe_stream_add_point_check(info, current_ev, |
1339 | end_buf, &iwe, | |
1340 | (void *)pos); | |
1341 | if (IS_ERR(current_ev)) | |
1342 | return current_ev; | |
2a519311 JB |
1343 | pos = next; |
1344 | } | |
1345 | ||
1346 | if (end > pos) { | |
1347 | memset(&iwe, 0, sizeof(iwe)); | |
1348 | iwe.cmd = IWEVGENIE; | |
1349 | iwe.u.data.length = end - 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 | 1355 | } |
76a70e9c JM |
1356 | |
1357 | return current_ev; | |
2a519311 JB |
1358 | } |
1359 | ||
2a519311 | 1360 | static char * |
77965c97 JB |
1361 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1362 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1363 | char *end_buf) | |
2a519311 | 1364 | { |
9caf0364 | 1365 | const struct cfg80211_bss_ies *ies; |
2a519311 | 1366 | struct iw_event iwe; |
9caf0364 | 1367 | const u8 *ie; |
76a70e9c JM |
1368 | u8 buf[50]; |
1369 | u8 *cfg, *p, *tmp; | |
9caf0364 | 1370 | int rem, i, sig; |
2a519311 JB |
1371 | bool ismesh = false; |
1372 | ||
1373 | memset(&iwe, 0, sizeof(iwe)); | |
1374 | iwe.cmd = SIOCGIWAP; | |
1375 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1376 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
76a70e9c JM |
1377 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1378 | IW_EV_ADDR_LEN); | |
1379 | if (IS_ERR(current_ev)) | |
1380 | return current_ev; | |
2a519311 JB |
1381 | |
1382 | memset(&iwe, 0, sizeof(iwe)); | |
1383 | iwe.cmd = SIOCGIWFREQ; | |
1384 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1385 | iwe.u.freq.e = 0; | |
76a70e9c JM |
1386 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1387 | IW_EV_FREQ_LEN); | |
1388 | if (IS_ERR(current_ev)) | |
1389 | return current_ev; | |
2a519311 JB |
1390 | |
1391 | memset(&iwe, 0, sizeof(iwe)); | |
1392 | iwe.cmd = SIOCGIWFREQ; | |
1393 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1394 | iwe.u.freq.e = 6; | |
76a70e9c JM |
1395 | current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, |
1396 | IW_EV_FREQ_LEN); | |
1397 | if (IS_ERR(current_ev)) | |
1398 | return current_ev; | |
2a519311 | 1399 | |
77965c97 | 1400 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1401 | memset(&iwe, 0, sizeof(iwe)); |
1402 | iwe.cmd = IWEVQUAL; | |
1403 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1404 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1405 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1406 | switch (wiphy->signal_type) { |
2a519311 | 1407 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1408 | sig = bss->pub.signal / 100; |
1409 | iwe.u.qual.level = sig; | |
2a519311 | 1410 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1411 | if (sig < -110) /* rather bad */ |
1412 | sig = -110; | |
1413 | else if (sig > -40) /* perfect */ | |
1414 | sig = -40; | |
1415 | /* will give a range of 0 .. 70 */ | |
1416 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1417 | break; |
1418 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1419 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1420 | /* will give range 0 .. 100 */ |
1421 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1422 | break; |
1423 | default: | |
1424 | /* not reached */ | |
1425 | break; | |
1426 | } | |
76a70e9c JM |
1427 | current_ev = iwe_stream_add_event_check(info, current_ev, |
1428 | end_buf, &iwe, | |
1429 | IW_EV_QUAL_LEN); | |
1430 | if (IS_ERR(current_ev)) | |
1431 | return current_ev; | |
2a519311 JB |
1432 | } |
1433 | ||
1434 | memset(&iwe, 0, sizeof(iwe)); | |
1435 | iwe.cmd = SIOCGIWENCODE; | |
1436 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1437 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1438 | else | |
1439 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1440 | iwe.u.data.length = 0; | |
76a70e9c JM |
1441 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, |
1442 | &iwe, ""); | |
1443 | if (IS_ERR(current_ev)) | |
1444 | return current_ev; | |
2a519311 | 1445 | |
9caf0364 JB |
1446 | rcu_read_lock(); |
1447 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
1448 | rem = ies->len; |
1449 | ie = ies->data; | |
9caf0364 | 1450 | |
83c7aa1a | 1451 | while (rem >= 2) { |
2a519311 JB |
1452 | /* invalid data */ |
1453 | if (ie[1] > rem - 2) | |
1454 | break; | |
1455 | ||
1456 | switch (ie[0]) { | |
1457 | case WLAN_EID_SSID: | |
1458 | memset(&iwe, 0, sizeof(iwe)); | |
1459 | iwe.cmd = SIOCGIWESSID; | |
1460 | iwe.u.data.length = ie[1]; | |
1461 | iwe.u.data.flags = 1; | |
76a70e9c JM |
1462 | current_ev = iwe_stream_add_point_check(info, |
1463 | current_ev, | |
1464 | end_buf, &iwe, | |
1465 | (u8 *)ie + 2); | |
1466 | if (IS_ERR(current_ev)) | |
1467 | goto unlock; | |
2a519311 JB |
1468 | break; |
1469 | case WLAN_EID_MESH_ID: | |
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_CONFIG: | |
1482 | ismesh = true; | |
136cfa28 | 1483 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 | 1484 | break; |
9caf0364 | 1485 | cfg = (u8 *)ie + 2; |
2a519311 JB |
1486 | memset(&iwe, 0, sizeof(iwe)); |
1487 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1488 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1489 | "0x%02X", cfg[0]); | |
2a519311 | 1490 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1491 | current_ev = iwe_stream_add_point_check(info, |
1492 | current_ev, | |
1493 | end_buf, | |
1494 | &iwe, buf); | |
1495 | if (IS_ERR(current_ev)) | |
1496 | goto unlock; | |
76aa5e70 RP |
1497 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1498 | cfg[1]); | |
2a519311 | 1499 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1500 | current_ev = iwe_stream_add_point_check(info, |
1501 | current_ev, | |
1502 | end_buf, | |
1503 | &iwe, buf); | |
1504 | if (IS_ERR(current_ev)) | |
1505 | goto unlock; | |
76aa5e70 RP |
1506 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1507 | cfg[2]); | |
2a519311 | 1508 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1509 | current_ev = iwe_stream_add_point_check(info, |
1510 | current_ev, | |
1511 | end_buf, | |
1512 | &iwe, buf); | |
1513 | if (IS_ERR(current_ev)) | |
1514 | goto unlock; | |
76aa5e70 | 1515 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 | 1516 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1517 | current_ev = iwe_stream_add_point_check(info, |
1518 | current_ev, | |
1519 | end_buf, | |
1520 | &iwe, buf); | |
1521 | if (IS_ERR(current_ev)) | |
1522 | goto unlock; | |
76aa5e70 RP |
1523 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1524 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
1525 | current_ev = iwe_stream_add_point_check(info, |
1526 | current_ev, | |
1527 | end_buf, | |
1528 | &iwe, buf); | |
1529 | if (IS_ERR(current_ev)) | |
1530 | goto unlock; | |
76aa5e70 RP |
1531 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); |
1532 | iwe.u.data.length = strlen(buf); | |
76a70e9c JM |
1533 | current_ev = iwe_stream_add_point_check(info, |
1534 | current_ev, | |
1535 | end_buf, | |
1536 | &iwe, buf); | |
1537 | if (IS_ERR(current_ev)) | |
1538 | goto unlock; | |
76aa5e70 | 1539 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); |
2a519311 | 1540 | iwe.u.data.length = strlen(buf); |
76a70e9c JM |
1541 | current_ev = iwe_stream_add_point_check(info, |
1542 | current_ev, | |
1543 | end_buf, | |
1544 | &iwe, buf); | |
1545 | if (IS_ERR(current_ev)) | |
1546 | goto unlock; | |
2a519311 JB |
1547 | break; |
1548 | case WLAN_EID_SUPP_RATES: | |
1549 | case WLAN_EID_EXT_SUPP_RATES: | |
1550 | /* display all supported rates in readable format */ | |
1551 | p = current_ev + iwe_stream_lcp_len(info); | |
1552 | ||
1553 | memset(&iwe, 0, sizeof(iwe)); | |
1554 | iwe.cmd = SIOCGIWRATE; | |
1555 | /* Those two flags are ignored... */ | |
1556 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1557 | ||
1558 | for (i = 0; i < ie[1]; i++) { | |
1559 | iwe.u.bitrate.value = | |
1560 | ((ie[i + 2] & 0x7f) * 500000); | |
76a70e9c | 1561 | tmp = p; |
2a519311 | 1562 | p = iwe_stream_add_value(info, current_ev, p, |
76a70e9c JM |
1563 | end_buf, &iwe, |
1564 | IW_EV_PARAM_LEN); | |
1565 | if (p == tmp) { | |
1566 | current_ev = ERR_PTR(-E2BIG); | |
1567 | goto unlock; | |
1568 | } | |
2a519311 JB |
1569 | } |
1570 | current_ev = p; | |
1571 | break; | |
1572 | } | |
1573 | rem -= ie[1] + 2; | |
1574 | ie += ie[1] + 2; | |
1575 | } | |
1576 | ||
f64f9e71 JP |
1577 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1578 | ismesh) { | |
2a519311 JB |
1579 | memset(&iwe, 0, sizeof(iwe)); |
1580 | iwe.cmd = SIOCGIWMODE; | |
1581 | if (ismesh) | |
1582 | iwe.u.mode = IW_MODE_MESH; | |
1583 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1584 | iwe.u.mode = IW_MODE_MASTER; | |
1585 | else | |
1586 | iwe.u.mode = IW_MODE_ADHOC; | |
76a70e9c JM |
1587 | current_ev = iwe_stream_add_event_check(info, current_ev, |
1588 | end_buf, &iwe, | |
1589 | IW_EV_UINT_LEN); | |
1590 | if (IS_ERR(current_ev)) | |
1591 | goto unlock; | |
2a519311 JB |
1592 | } |
1593 | ||
76a70e9c JM |
1594 | memset(&iwe, 0, sizeof(iwe)); |
1595 | iwe.cmd = IWEVCUSTOM; | |
1596 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); | |
1597 | iwe.u.data.length = strlen(buf); | |
1598 | current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, | |
1599 | &iwe, buf); | |
1600 | if (IS_ERR(current_ev)) | |
1601 | goto unlock; | |
1602 | memset(&iwe, 0, sizeof(iwe)); | |
1603 | iwe.cmd = IWEVCUSTOM; | |
1604 | sprintf(buf, " Last beacon: %ums ago", | |
1605 | elapsed_jiffies_msecs(bss->ts)); | |
1606 | iwe.u.data.length = strlen(buf); | |
1607 | current_ev = iwe_stream_add_point_check(info, current_ev, | |
1608 | end_buf, &iwe, buf); | |
1609 | if (IS_ERR(current_ev)) | |
1610 | goto unlock; | |
1611 | ||
1612 | current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); | |
1613 | ||
1614 | unlock: | |
9caf0364 | 1615 | rcu_read_unlock(); |
2a519311 JB |
1616 | return current_ev; |
1617 | } | |
1618 | ||
1619 | ||
1b8ec87a | 1620 | static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, |
2a519311 JB |
1621 | struct iw_request_info *info, |
1622 | char *buf, size_t len) | |
1623 | { | |
1624 | char *current_ev = buf; | |
1625 | char *end_buf = buf + len; | |
1626 | struct cfg80211_internal_bss *bss; | |
76a70e9c | 1627 | int err = 0; |
2a519311 | 1628 | |
1b8ec87a ZG |
1629 | spin_lock_bh(&rdev->bss_lock); |
1630 | cfg80211_bss_expire(rdev); | |
2a519311 | 1631 | |
1b8ec87a | 1632 | list_for_each_entry(bss, &rdev->bss_list, list) { |
2a519311 | 1633 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { |
76a70e9c JM |
1634 | err = -E2BIG; |
1635 | break; | |
2a519311 | 1636 | } |
1b8ec87a | 1637 | current_ev = ieee80211_bss(&rdev->wiphy, info, bss, |
77965c97 | 1638 | current_ev, end_buf); |
76a70e9c JM |
1639 | if (IS_ERR(current_ev)) { |
1640 | err = PTR_ERR(current_ev); | |
1641 | break; | |
1642 | } | |
2a519311 | 1643 | } |
1b8ec87a | 1644 | spin_unlock_bh(&rdev->bss_lock); |
76a70e9c JM |
1645 | |
1646 | if (err) | |
1647 | return err; | |
2a519311 JB |
1648 | return current_ev - buf; |
1649 | } | |
1650 | ||
1651 | ||
1652 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1653 | struct iw_request_info *info, | |
1654 | struct iw_point *data, char *extra) | |
1655 | { | |
1656 | struct cfg80211_registered_device *rdev; | |
1657 | int res; | |
1658 | ||
1659 | if (!netif_running(dev)) | |
1660 | return -ENETDOWN; | |
1661 | ||
463d0183 | 1662 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1663 | |
1664 | if (IS_ERR(rdev)) | |
1665 | return PTR_ERR(rdev); | |
1666 | ||
f9d15d16 | 1667 | if (rdev->scan_req || rdev->scan_msg) |
5fe231e8 | 1668 | return -EAGAIN; |
2a519311 JB |
1669 | |
1670 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1671 | data->length = 0; | |
1672 | if (res >= 0) { | |
1673 | data->length = res; | |
1674 | res = 0; | |
1675 | } | |
1676 | ||
2a519311 JB |
1677 | return res; |
1678 | } | |
2afe38d1 | 1679 | EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); |
2a519311 | 1680 | #endif |