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Commit | Line | Data |
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2a519311 JB |
1 | /* |
2 | * cfg80211 scan result handling | |
3 | * | |
4 | * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> | |
5 | */ | |
6 | #include <linux/kernel.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
2a519311 JB |
8 | #include <linux/module.h> |
9 | #include <linux/netdevice.h> | |
10 | #include <linux/wireless.h> | |
11 | #include <linux/nl80211.h> | |
12 | #include <linux/etherdevice.h> | |
13 | #include <net/arp.h> | |
14 | #include <net/cfg80211.h> | |
262eb9b2 | 15 | #include <net/cfg80211-wext.h> |
2a519311 JB |
16 | #include <net/iw_handler.h> |
17 | #include "core.h" | |
18 | #include "nl80211.h" | |
a9a11622 | 19 | #include "wext-compat.h" |
e35e4d28 | 20 | #include "rdev-ops.h" |
2a519311 | 21 | |
776b3580 JB |
22 | /** |
23 | * DOC: BSS tree/list structure | |
24 | * | |
25 | * At the top level, the BSS list is kept in both a list in each | |
26 | * registered device (@bss_list) as well as an RB-tree for faster | |
27 | * lookup. In the RB-tree, entries can be looked up using their | |
28 | * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID | |
29 | * for other BSSes. | |
30 | * | |
31 | * Due to the possibility of hidden SSIDs, there's a second level | |
32 | * structure, the "hidden_list" and "hidden_beacon_bss" pointer. | |
33 | * The hidden_list connects all BSSes belonging to a single AP | |
34 | * that has a hidden SSID, and connects beacon and probe response | |
35 | * entries. For a probe response entry for a hidden SSID, the | |
36 | * hidden_beacon_bss pointer points to the BSS struct holding the | |
37 | * beacon's information. | |
38 | * | |
39 | * Reference counting is done for all these references except for | |
40 | * the hidden_list, so that a beacon BSS struct that is otherwise | |
41 | * not referenced has one reference for being on the bss_list and | |
42 | * one for each probe response entry that points to it using the | |
43 | * hidden_beacon_bss pointer. When a BSS struct that has such a | |
44 | * pointer is get/put, the refcount update is also propagated to | |
45 | * the referenced struct, this ensure that it cannot get removed | |
46 | * while somebody is using the probe response version. | |
47 | * | |
48 | * Note that the hidden_beacon_bss pointer never changes, due to | |
49 | * the reference counting. Therefore, no locking is needed for | |
50 | * it. | |
51 | * | |
52 | * Also note that the hidden_beacon_bss pointer is only relevant | |
53 | * if the driver uses something other than the IEs, e.g. private | |
54 | * data stored stored in the BSS struct, since the beacon IEs are | |
55 | * also linked into the probe response struct. | |
56 | */ | |
57 | ||
f9616e0f | 58 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 59 | |
776b3580 | 60 | static void bss_free(struct cfg80211_internal_bss *bss) |
e8e27c66 | 61 | { |
9caf0364 | 62 | struct cfg80211_bss_ies *ies; |
b629ea3d JB |
63 | |
64 | if (WARN_ON(atomic_read(&bss->hold))) | |
65 | return; | |
66 | ||
9caf0364 | 67 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
776b3580 | 68 | if (ies && !bss->pub.hidden_beacon_bss) |
9caf0364 JB |
69 | kfree_rcu(ies, rcu_head); |
70 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
71 | if (ies) | |
72 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 73 | |
776b3580 JB |
74 | /* |
75 | * This happens when the module is removed, it doesn't | |
76 | * really matter any more save for completeness | |
77 | */ | |
78 | if (!list_empty(&bss->hidden_list)) | |
79 | list_del(&bss->hidden_list); | |
80 | ||
e8e27c66 AK |
81 | kfree(bss); |
82 | } | |
83 | ||
776b3580 JB |
84 | static inline void bss_ref_get(struct cfg80211_registered_device *dev, |
85 | struct cfg80211_internal_bss *bss) | |
0532d4f1 | 86 | { |
776b3580 JB |
87 | lockdep_assert_held(&dev->bss_lock); |
88 | ||
89 | bss->refcount++; | |
90 | if (bss->pub.hidden_beacon_bss) { | |
91 | bss = container_of(bss->pub.hidden_beacon_bss, | |
92 | struct cfg80211_internal_bss, | |
93 | pub); | |
94 | bss->refcount++; | |
95 | } | |
0532d4f1 JB |
96 | } |
97 | ||
776b3580 JB |
98 | static inline void bss_ref_put(struct cfg80211_registered_device *dev, |
99 | struct cfg80211_internal_bss *bss) | |
0532d4f1 | 100 | { |
776b3580 JB |
101 | lockdep_assert_held(&dev->bss_lock); |
102 | ||
103 | if (bss->pub.hidden_beacon_bss) { | |
104 | struct cfg80211_internal_bss *hbss; | |
105 | hbss = container_of(bss->pub.hidden_beacon_bss, | |
106 | struct cfg80211_internal_bss, | |
107 | pub); | |
108 | hbss->refcount--; | |
109 | if (hbss->refcount == 0) | |
110 | bss_free(hbss); | |
111 | } | |
112 | bss->refcount--; | |
113 | if (bss->refcount == 0) | |
114 | bss_free(bss); | |
0532d4f1 JB |
115 | } |
116 | ||
776b3580 | 117 | static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, |
e8e27c66 AK |
118 | struct cfg80211_internal_bss *bss) |
119 | { | |
4b1af479 JB |
120 | lockdep_assert_held(&dev->bss_lock); |
121 | ||
776b3580 JB |
122 | if (!list_empty(&bss->hidden_list)) { |
123 | /* | |
124 | * don't remove the beacon entry if it has | |
125 | * probe responses associated with it | |
126 | */ | |
127 | if (!bss->pub.hidden_beacon_bss) | |
128 | return false; | |
129 | /* | |
130 | * if it's a probe response entry break its | |
131 | * link to the other entries in the group | |
132 | */ | |
133 | list_del_init(&bss->hidden_list); | |
134 | } | |
135 | ||
e8e27c66 AK |
136 | list_del_init(&bss->list); |
137 | rb_erase(&bss->rbn, &dev->bss_tree); | |
776b3580 JB |
138 | bss_ref_put(dev, bss); |
139 | return true; | |
e8e27c66 AK |
140 | } |
141 | ||
15d6030b SL |
142 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev, |
143 | unsigned long expire_time) | |
144 | { | |
145 | struct cfg80211_internal_bss *bss, *tmp; | |
146 | bool expired = false; | |
147 | ||
4b1af479 JB |
148 | lockdep_assert_held(&dev->bss_lock); |
149 | ||
15d6030b SL |
150 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { |
151 | if (atomic_read(&bss->hold)) | |
152 | continue; | |
153 | if (!time_after(expire_time, bss->ts)) | |
154 | continue; | |
155 | ||
776b3580 JB |
156 | if (__cfg80211_unlink_bss(dev, bss)) |
157 | expired = true; | |
15d6030b SL |
158 | } |
159 | ||
160 | if (expired) | |
161 | dev->bss_generation++; | |
162 | } | |
163 | ||
01a0ac41 | 164 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) |
2a519311 | 165 | { |
667503dd | 166 | struct cfg80211_scan_request *request; |
fd014284 | 167 | struct wireless_dev *wdev; |
3d23e349 | 168 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
169 | union iwreq_data wrqu; |
170 | #endif | |
171 | ||
5fe231e8 | 172 | ASSERT_RTNL(); |
01a0ac41 | 173 | |
667503dd JB |
174 | request = rdev->scan_req; |
175 | ||
01a0ac41 JB |
176 | if (!request) |
177 | return; | |
178 | ||
fd014284 | 179 | wdev = request->wdev; |
2a519311 | 180 | |
6829c878 JB |
181 | /* |
182 | * This must be before sending the other events! | |
183 | * Otherwise, wpa_supplicant gets completely confused with | |
184 | * wext events. | |
185 | */ | |
fd014284 JB |
186 | if (wdev->netdev) |
187 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 188 | |
15d6030b | 189 | if (request->aborted) { |
fd014284 | 190 | nl80211_send_scan_aborted(rdev, wdev); |
15d6030b SL |
191 | } else { |
192 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
193 | /* flush entries from previous scans */ | |
194 | spin_lock_bh(&rdev->bss_lock); | |
195 | __cfg80211_bss_expire(rdev, request->scan_start); | |
196 | spin_unlock_bh(&rdev->bss_lock); | |
197 | } | |
fd014284 | 198 | nl80211_send_scan_done(rdev, wdev); |
15d6030b | 199 | } |
2a519311 | 200 | |
3d23e349 | 201 | #ifdef CONFIG_CFG80211_WEXT |
fd014284 | 202 | if (wdev->netdev && !request->aborted) { |
2a519311 JB |
203 | memset(&wrqu, 0, sizeof(wrqu)); |
204 | ||
fd014284 | 205 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
206 | } |
207 | #endif | |
208 | ||
fd014284 JB |
209 | if (wdev->netdev) |
210 | dev_put(wdev->netdev); | |
2a519311 | 211 | |
36e6fea8 | 212 | rdev->scan_req = NULL; |
01a0ac41 JB |
213 | |
214 | /* | |
215 | * OK. If this is invoked with "leak" then we can't | |
216 | * free this ... but we've cleaned it up anyway. The | |
217 | * driver failed to call the scan_done callback, so | |
218 | * all bets are off, it might still be trying to use | |
219 | * the scan request or not ... if it accesses the dev | |
220 | * in there (it shouldn't anyway) then it may crash. | |
221 | */ | |
222 | if (!leak) | |
223 | kfree(request); | |
2a519311 | 224 | } |
667503dd | 225 | |
36e6fea8 JB |
226 | void __cfg80211_scan_done(struct work_struct *wk) |
227 | { | |
228 | struct cfg80211_registered_device *rdev; | |
229 | ||
230 | rdev = container_of(wk, struct cfg80211_registered_device, | |
231 | scan_done_wk); | |
232 | ||
5fe231e8 | 233 | rtnl_lock(); |
01a0ac41 | 234 | ___cfg80211_scan_done(rdev, false); |
5fe231e8 | 235 | rtnl_unlock(); |
36e6fea8 JB |
236 | } |
237 | ||
667503dd JB |
238 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
239 | { | |
4ee3e063 | 240 | trace_cfg80211_scan_done(request, aborted); |
667503dd JB |
241 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
242 | ||
243 | request->aborted = aborted; | |
5fe231e8 | 244 | request->notified = true; |
e60d7443 | 245 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
667503dd | 246 | } |
2a519311 JB |
247 | EXPORT_SYMBOL(cfg80211_scan_done); |
248 | ||
807f8a8c LC |
249 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
250 | { | |
251 | struct cfg80211_registered_device *rdev; | |
15d6030b | 252 | struct cfg80211_sched_scan_request *request; |
807f8a8c LC |
253 | |
254 | rdev = container_of(wk, struct cfg80211_registered_device, | |
255 | sched_scan_results_wk); | |
256 | ||
15d6030b SL |
257 | request = rdev->sched_scan_req; |
258 | ||
5fe231e8 | 259 | rtnl_lock(); |
807f8a8c LC |
260 | |
261 | /* we don't have sched_scan_req anymore if the scan is stopping */ | |
15d6030b SL |
262 | if (request) { |
263 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
264 | /* flush entries from previous scans */ | |
265 | spin_lock_bh(&rdev->bss_lock); | |
266 | __cfg80211_bss_expire(rdev, request->scan_start); | |
267 | spin_unlock_bh(&rdev->bss_lock); | |
268 | request->scan_start = | |
269 | jiffies + msecs_to_jiffies(request->interval); | |
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 LC |
280 | /* ignore if we're not scanning */ |
281 | if (wiphy_to_dev(wiphy)->sched_scan_req) | |
282 | queue_work(cfg80211_wq, | |
283 | &wiphy_to_dev(wiphy)->sched_scan_results_wk); | |
284 | } | |
285 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
286 | ||
85a9994a | 287 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) |
807f8a8c | 288 | { |
85a9994a | 289 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
807f8a8c | 290 | |
4ee3e063 BL |
291 | trace_cfg80211_sched_scan_stopped(wiphy); |
292 | ||
5fe231e8 | 293 | rtnl_lock(); |
807f8a8c | 294 | __cfg80211_stop_sched_scan(rdev, true); |
5fe231e8 | 295 | rtnl_unlock(); |
807f8a8c | 296 | } |
807f8a8c LC |
297 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
298 | ||
299 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, | |
300 | bool driver_initiated) | |
301 | { | |
807f8a8c LC |
302 | struct net_device *dev; |
303 | ||
5fe231e8 | 304 | ASSERT_RTNL(); |
807f8a8c LC |
305 | |
306 | if (!rdev->sched_scan_req) | |
1a84ff75 | 307 | return -ENOENT; |
807f8a8c LC |
308 | |
309 | dev = rdev->sched_scan_req->dev; | |
310 | ||
85a9994a | 311 | if (!driver_initiated) { |
e35e4d28 | 312 | int err = rdev_sched_scan_stop(rdev, dev); |
85a9994a LC |
313 | if (err) |
314 | return err; | |
315 | } | |
807f8a8c LC |
316 | |
317 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); | |
318 | ||
319 | kfree(rdev->sched_scan_req); | |
320 | rdev->sched_scan_req = NULL; | |
321 | ||
3b4670ff | 322 | return 0; |
807f8a8c LC |
323 | } |
324 | ||
cb3a8eec DW |
325 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, |
326 | unsigned long age_secs) | |
327 | { | |
328 | struct cfg80211_internal_bss *bss; | |
329 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
330 | ||
2ca813ad | 331 | spin_lock_bh(&dev->bss_lock); |
915de2ff | 332 | list_for_each_entry(bss, &dev->bss_list, list) |
cb3a8eec | 333 | bss->ts -= age_jiffies; |
2ca813ad | 334 | spin_unlock_bh(&dev->bss_lock); |
cb3a8eec DW |
335 | } |
336 | ||
2a519311 JB |
337 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) |
338 | { | |
15d6030b | 339 | __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
340 | } |
341 | ||
c21dbf92 | 342 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
2a519311 | 343 | { |
c21dbf92 | 344 | while (len > 2 && ies[0] != eid) { |
2a519311 JB |
345 | len -= ies[1] + 2; |
346 | ies += ies[1] + 2; | |
347 | } | |
348 | if (len < 2) | |
349 | return NULL; | |
350 | if (len < 2 + ies[1]) | |
351 | return NULL; | |
352 | return ies; | |
353 | } | |
c21dbf92 | 354 | EXPORT_SYMBOL(cfg80211_find_ie); |
2a519311 | 355 | |
0c28ec58 EP |
356 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, |
357 | const u8 *ies, int len) | |
358 | { | |
359 | struct ieee80211_vendor_ie *ie; | |
360 | const u8 *pos = ies, *end = ies + len; | |
361 | int ie_oui; | |
362 | ||
363 | while (pos < end) { | |
364 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, | |
365 | end - pos); | |
366 | if (!pos) | |
367 | return NULL; | |
368 | ||
0c28ec58 | 369 | ie = (struct ieee80211_vendor_ie *)pos; |
6719429d LC |
370 | |
371 | /* make sure we can access ie->len */ | |
372 | BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1); | |
373 | ||
374 | if (ie->len < sizeof(*ie)) | |
375 | goto cont; | |
376 | ||
0c28ec58 EP |
377 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; |
378 | if (ie_oui == oui && ie->oui_type == oui_type) | |
379 | return pos; | |
6719429d | 380 | cont: |
0c28ec58 EP |
381 | pos += 2 + ie->len; |
382 | } | |
383 | return NULL; | |
384 | } | |
385 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
386 | ||
915de2ff | 387 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
2a519311 JB |
388 | const u8 *ssid, size_t ssid_len) |
389 | { | |
9caf0364 | 390 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
391 | const u8 *ssidie; |
392 | ||
ac422d3c | 393 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
394 | return false; |
395 | ||
79420f09 JB |
396 | if (!ssid) |
397 | return true; | |
398 | ||
9caf0364 JB |
399 | ies = rcu_access_pointer(a->ies); |
400 | if (!ies) | |
401 | return false; | |
402 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
2a519311 JB |
403 | if (!ssidie) |
404 | return false; | |
405 | if (ssidie[1] != ssid_len) | |
406 | return false; | |
407 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
408 | } | |
409 | ||
4593c4cb JB |
410 | /** |
411 | * enum bss_compare_mode - BSS compare mode | |
412 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
413 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
414 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
415 | */ | |
416 | enum bss_compare_mode { | |
417 | BSS_CMP_REGULAR, | |
418 | BSS_CMP_HIDE_ZLEN, | |
419 | BSS_CMP_HIDE_NUL, | |
420 | }; | |
421 | ||
dd9dfb9f | 422 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 423 | struct cfg80211_bss *b, |
4593c4cb | 424 | enum bss_compare_mode mode) |
dd9dfb9f | 425 | { |
9caf0364 | 426 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
427 | const u8 *ie1 = NULL; |
428 | const u8 *ie2 = NULL; | |
5622f5bb | 429 | int i, r; |
dd9dfb9f | 430 | |
3af6341c JB |
431 | if (a->channel != b->channel) |
432 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 433 | |
9caf0364 JB |
434 | a_ies = rcu_access_pointer(a->ies); |
435 | if (!a_ies) | |
436 | return -1; | |
437 | b_ies = rcu_access_pointer(b->ies); | |
438 | if (!b_ies) | |
439 | return 1; | |
440 | ||
3af6341c JB |
441 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
442 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
443 | a_ies->data, a_ies->len); | |
444 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
445 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
446 | b_ies->data, b_ies->len); | |
447 | if (ie1 && ie2) { | |
448 | int mesh_id_cmp; | |
449 | ||
450 | if (ie1[1] == ie2[1]) | |
451 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
452 | else | |
453 | mesh_id_cmp = ie2[1] - ie1[1]; | |
454 | ||
455 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
456 | a_ies->data, a_ies->len); | |
457 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
458 | b_ies->data, b_ies->len); | |
459 | if (ie1 && ie2) { | |
460 | if (mesh_id_cmp) | |
461 | return mesh_id_cmp; | |
462 | if (ie1[1] != ie2[1]) | |
463 | return ie2[1] - ie1[1]; | |
464 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
465 | } | |
466 | } | |
467 | ||
468 | /* | |
469 | * we can't use compare_ether_addr here since we need a < > operator. | |
470 | * The binary return value of compare_ether_addr isn't enough | |
471 | */ | |
472 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); | |
473 | if (r) | |
474 | return r; | |
475 | ||
9caf0364 JB |
476 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
477 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 478 | |
5622f5bb JB |
479 | if (!ie1 && !ie2) |
480 | return 0; | |
481 | ||
f94f8b16 | 482 | /* |
5622f5bb JB |
483 | * Note that with "hide_ssid", the function returns a match if |
484 | * the already-present BSS ("b") is a hidden SSID beacon for | |
485 | * the new BSS ("a"). | |
f94f8b16 | 486 | */ |
dd9dfb9f DT |
487 | |
488 | /* sort missing IE before (left of) present IE */ | |
489 | if (!ie1) | |
490 | return -1; | |
491 | if (!ie2) | |
492 | return 1; | |
493 | ||
4593c4cb JB |
494 | switch (mode) { |
495 | case BSS_CMP_HIDE_ZLEN: | |
496 | /* | |
497 | * In ZLEN mode we assume the BSS entry we're | |
498 | * looking for has a zero-length SSID. So if | |
499 | * the one we're looking at right now has that, | |
500 | * return 0. Otherwise, return the difference | |
501 | * in length, but since we're looking for the | |
502 | * 0-length it's really equivalent to returning | |
503 | * the length of the one we're looking at. | |
504 | * | |
505 | * No content comparison is needed as we assume | |
506 | * the content length is zero. | |
507 | */ | |
508 | return ie2[1]; | |
509 | case BSS_CMP_REGULAR: | |
510 | default: | |
511 | /* sort by length first, then by contents */ | |
512 | if (ie1[1] != ie2[1]) | |
513 | return ie2[1] - ie1[1]; | |
5622f5bb | 514 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
515 | case BSS_CMP_HIDE_NUL: |
516 | if (ie1[1] != ie2[1]) | |
517 | return ie2[1] - ie1[1]; | |
518 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
519 | for (i = 0; i < ie2[1]; i++) | |
520 | if (ie2[i + 2]) | |
521 | return -1; | |
522 | return 0; | |
523 | } | |
dd9dfb9f DT |
524 | } |
525 | ||
2a519311 JB |
526 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
527 | struct ieee80211_channel *channel, | |
528 | const u8 *bssid, | |
79420f09 JB |
529 | const u8 *ssid, size_t ssid_len, |
530 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
531 | { |
532 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
533 | struct cfg80211_internal_bss *bss, *res = NULL; | |
ccb6c136 | 534 | unsigned long now = jiffies; |
2a519311 | 535 | |
4ee3e063 BL |
536 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask, |
537 | capa_val); | |
538 | ||
2a519311 JB |
539 | spin_lock_bh(&dev->bss_lock); |
540 | ||
541 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
542 | if ((bss->pub.capability & capa_mask) != capa_val) |
543 | continue; | |
2a519311 JB |
544 | if (channel && bss->pub.channel != channel) |
545 | continue; | |
ccb6c136 JB |
546 | /* Don't get expired BSS structs */ |
547 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
548 | !atomic_read(&bss->hold)) | |
549 | continue; | |
2a519311 JB |
550 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
551 | res = bss; | |
776b3580 | 552 | bss_ref_get(dev, res); |
2a519311 JB |
553 | break; |
554 | } | |
555 | } | |
556 | ||
557 | spin_unlock_bh(&dev->bss_lock); | |
558 | if (!res) | |
559 | return NULL; | |
4ee3e063 | 560 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
561 | return &res->pub; |
562 | } | |
563 | EXPORT_SYMBOL(cfg80211_get_bss); | |
564 | ||
2a519311 JB |
565 | static void rb_insert_bss(struct cfg80211_registered_device *dev, |
566 | struct cfg80211_internal_bss *bss) | |
567 | { | |
568 | struct rb_node **p = &dev->bss_tree.rb_node; | |
569 | struct rb_node *parent = NULL; | |
570 | struct cfg80211_internal_bss *tbss; | |
571 | int cmp; | |
572 | ||
573 | while (*p) { | |
574 | parent = *p; | |
575 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
576 | ||
4593c4cb | 577 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
578 | |
579 | if (WARN_ON(!cmp)) { | |
580 | /* will sort of leak this BSS */ | |
581 | return; | |
582 | } | |
583 | ||
584 | if (cmp < 0) | |
585 | p = &(*p)->rb_left; | |
586 | else | |
587 | p = &(*p)->rb_right; | |
588 | } | |
589 | ||
590 | rb_link_node(&bss->rbn, parent, p); | |
591 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
592 | } | |
593 | ||
594 | static struct cfg80211_internal_bss * | |
595 | rb_find_bss(struct cfg80211_registered_device *dev, | |
5622f5bb | 596 | struct cfg80211_internal_bss *res, |
4593c4cb | 597 | enum bss_compare_mode mode) |
dd9dfb9f DT |
598 | { |
599 | struct rb_node *n = dev->bss_tree.rb_node; | |
600 | struct cfg80211_internal_bss *bss; | |
601 | int r; | |
602 | ||
603 | while (n) { | |
604 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 605 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
606 | |
607 | if (r == 0) | |
608 | return bss; | |
609 | else if (r < 0) | |
610 | n = n->rb_left; | |
611 | else | |
612 | n = n->rb_right; | |
613 | } | |
614 | ||
615 | return NULL; | |
616 | } | |
617 | ||
776b3580 JB |
618 | static bool cfg80211_combine_bsses(struct cfg80211_registered_device *dev, |
619 | struct cfg80211_internal_bss *new) | |
dd9dfb9f | 620 | { |
9caf0364 | 621 | const struct cfg80211_bss_ies *ies; |
776b3580 JB |
622 | struct cfg80211_internal_bss *bss; |
623 | const u8 *ie; | |
624 | int i, ssidlen; | |
625 | u8 fold = 0; | |
9caf0364 | 626 | |
776b3580 | 627 | ies = rcu_access_pointer(new->pub.beacon_ies); |
9caf0364 | 628 | if (WARN_ON(!ies)) |
776b3580 | 629 | return false; |
dd9dfb9f | 630 | |
776b3580 JB |
631 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); |
632 | if (!ie) { | |
633 | /* nothing to do */ | |
634 | return true; | |
635 | } | |
636 | ||
637 | ssidlen = ie[1]; | |
638 | for (i = 0; i < ssidlen; i++) | |
639 | fold |= ie[2 + i]; | |
640 | ||
641 | if (fold) { | |
642 | /* not a hidden SSID */ | |
643 | return true; | |
644 | } | |
645 | ||
646 | /* This is the bad part ... */ | |
647 | ||
648 | list_for_each_entry(bss, &dev->bss_list, list) { | |
649 | if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) | |
650 | continue; | |
651 | if (bss->pub.channel != new->pub.channel) | |
652 | continue; | |
653 | if (rcu_access_pointer(bss->pub.beacon_ies)) | |
654 | continue; | |
655 | ies = rcu_access_pointer(bss->pub.ies); | |
656 | if (!ies) | |
657 | continue; | |
658 | ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
659 | if (!ie) | |
660 | continue; | |
661 | if (ssidlen && ie[1] != ssidlen) | |
662 | continue; | |
663 | /* that would be odd ... */ | |
664 | if (bss->pub.beacon_ies) | |
665 | continue; | |
666 | if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) | |
667 | continue; | |
668 | if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) | |
669 | list_del(&bss->hidden_list); | |
670 | /* combine them */ | |
671 | list_add(&bss->hidden_list, &new->hidden_list); | |
672 | bss->pub.hidden_beacon_bss = &new->pub; | |
673 | new->refcount += bss->refcount; | |
674 | rcu_assign_pointer(bss->pub.beacon_ies, | |
675 | new->pub.beacon_ies); | |
676 | } | |
677 | ||
678 | return true; | |
dd9dfb9f DT |
679 | } |
680 | ||
2a519311 JB |
681 | static struct cfg80211_internal_bss * |
682 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
9caf0364 | 683 | struct cfg80211_internal_bss *tmp) |
2a519311 JB |
684 | { |
685 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 686 | |
9caf0364 | 687 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 688 | return NULL; |
2a519311 | 689 | |
9caf0364 | 690 | tmp->ts = jiffies; |
2a519311 | 691 | |
2a519311 JB |
692 | spin_lock_bh(&dev->bss_lock); |
693 | ||
9caf0364 JB |
694 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
695 | spin_unlock_bh(&dev->bss_lock); | |
696 | return NULL; | |
697 | } | |
698 | ||
4593c4cb | 699 | found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR); |
2a519311 | 700 | |
cd1658f5 | 701 | if (found) { |
34a6eddb | 702 | /* Update IEs */ |
9caf0364 JB |
703 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
704 | const struct cfg80211_bss_ies *old; | |
705 | ||
706 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 707 | |
9caf0364 JB |
708 | rcu_assign_pointer(found->pub.proberesp_ies, |
709 | tmp->pub.proberesp_ies); | |
34a6eddb | 710 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
711 | rcu_assign_pointer(found->pub.ies, |
712 | tmp->pub.proberesp_ies); | |
713 | if (old) | |
714 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
715 | rcu_head); | |
716 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
9537f227 | 717 | const struct cfg80211_bss_ies *old; |
776b3580 JB |
718 | struct cfg80211_internal_bss *bss; |
719 | ||
720 | if (found->pub.hidden_beacon_bss && | |
721 | !list_empty(&found->hidden_list)) { | |
1345ee6a JB |
722 | const struct cfg80211_bss_ies *f; |
723 | ||
776b3580 JB |
724 | /* |
725 | * The found BSS struct is one of the probe | |
726 | * response members of a group, but we're | |
727 | * receiving a beacon (beacon_ies in the tmp | |
728 | * bss is used). This can only mean that the | |
729 | * AP changed its beacon from not having an | |
730 | * SSID to showing it, which is confusing so | |
731 | * drop this information. | |
732 | */ | |
1345ee6a JB |
733 | |
734 | f = rcu_access_pointer(tmp->pub.beacon_ies); | |
735 | kfree_rcu((struct cfg80211_bss_ies *)f, | |
736 | rcu_head); | |
776b3580 JB |
737 | goto drop; |
738 | } | |
915de2ff | 739 | |
9caf0364 | 740 | old = rcu_access_pointer(found->pub.beacon_ies); |
9caf0364 JB |
741 | |
742 | rcu_assign_pointer(found->pub.beacon_ies, | |
743 | tmp->pub.beacon_ies); | |
01123e23 SN |
744 | |
745 | /* Override IEs if they were from a beacon before */ | |
9537f227 | 746 | if (old == rcu_access_pointer(found->pub.ies)) |
9caf0364 JB |
747 | rcu_assign_pointer(found->pub.ies, |
748 | tmp->pub.beacon_ies); | |
cd1658f5 | 749 | |
776b3580 JB |
750 | /* Assign beacon IEs to all sub entries */ |
751 | list_for_each_entry(bss, &found->hidden_list, | |
752 | hidden_list) { | |
753 | const struct cfg80211_bss_ies *ies; | |
754 | ||
755 | ies = rcu_access_pointer(bss->pub.beacon_ies); | |
756 | WARN_ON(ies != old); | |
757 | ||
758 | rcu_assign_pointer(bss->pub.beacon_ies, | |
759 | tmp->pub.beacon_ies); | |
760 | } | |
761 | ||
9caf0364 JB |
762 | if (old) |
763 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
764 | rcu_head); | |
765 | } | |
1345ee6a JB |
766 | |
767 | found->pub.beacon_interval = tmp->pub.beacon_interval; | |
768 | found->pub.signal = tmp->pub.signal; | |
769 | found->pub.capability = tmp->pub.capability; | |
770 | found->ts = tmp->ts; | |
2a519311 | 771 | } else { |
9caf0364 | 772 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 773 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 774 | struct cfg80211_bss_ies *ies; |
dd9dfb9f | 775 | |
9caf0364 JB |
776 | /* |
777 | * create a copy -- the "res" variable that is passed in | |
778 | * is allocated on the stack since it's not needed in the | |
779 | * more common case of an update | |
780 | */ | |
781 | new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size, | |
782 | GFP_ATOMIC); | |
783 | if (!new) { | |
784 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
785 | if (ies) | |
786 | kfree_rcu(ies, rcu_head); | |
787 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
788 | if (ies) | |
789 | kfree_rcu(ies, rcu_head); | |
776b3580 | 790 | goto drop; |
9caf0364 JB |
791 | } |
792 | memcpy(new, tmp, sizeof(*new)); | |
776b3580 JB |
793 | new->refcount = 1; |
794 | INIT_LIST_HEAD(&new->hidden_list); | |
795 | ||
796 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { | |
797 | hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN); | |
798 | if (!hidden) | |
799 | hidden = rb_find_bss(dev, tmp, | |
800 | BSS_CMP_HIDE_NUL); | |
801 | if (hidden) { | |
802 | new->pub.hidden_beacon_bss = &hidden->pub; | |
803 | list_add(&new->hidden_list, | |
804 | &hidden->hidden_list); | |
805 | hidden->refcount++; | |
806 | rcu_assign_pointer(new->pub.beacon_ies, | |
807 | hidden->pub.beacon_ies); | |
808 | } | |
809 | } else { | |
810 | /* | |
811 | * Ok so we found a beacon, and don't have an entry. If | |
812 | * it's a beacon with hidden SSID, we might be in for an | |
813 | * expensive search for any probe responses that should | |
814 | * be grouped with this beacon for updates ... | |
815 | */ | |
816 | if (!cfg80211_combine_bsses(dev, new)) { | |
817 | kfree(new); | |
818 | goto drop; | |
819 | } | |
820 | } | |
821 | ||
9caf0364 JB |
822 | list_add_tail(&new->list, &dev->bss_list); |
823 | rb_insert_bss(dev, new); | |
824 | found = new; | |
2a519311 JB |
825 | } |
826 | ||
827 | dev->bss_generation++; | |
776b3580 | 828 | bss_ref_get(dev, found); |
2a519311 JB |
829 | spin_unlock_bh(&dev->bss_lock); |
830 | ||
2a519311 | 831 | return found; |
776b3580 JB |
832 | drop: |
833 | spin_unlock_bh(&dev->bss_lock); | |
834 | return NULL; | |
2a519311 JB |
835 | } |
836 | ||
0172bb75 JB |
837 | static struct ieee80211_channel * |
838 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
839 | struct ieee80211_channel *channel) | |
840 | { | |
841 | const u8 *tmp; | |
842 | u32 freq; | |
843 | int channel_number = -1; | |
844 | ||
845 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
846 | if (tmp && tmp[1] == 1) { | |
847 | channel_number = tmp[2]; | |
848 | } else { | |
849 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
850 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
851 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
852 | ||
853 | channel_number = htop->primary_chan; | |
854 | } | |
855 | } | |
856 | ||
857 | if (channel_number < 0) | |
858 | return channel; | |
859 | ||
860 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
861 | channel = ieee80211_get_channel(wiphy, freq); | |
862 | if (!channel) | |
863 | return NULL; | |
864 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
865 | return NULL; | |
866 | return channel; | |
867 | } | |
868 | ||
06aa7afa JK |
869 | struct cfg80211_bss* |
870 | cfg80211_inform_bss(struct wiphy *wiphy, | |
871 | struct ieee80211_channel *channel, | |
7b8bcff2 JB |
872 | const u8 *bssid, u64 tsf, u16 capability, |
873 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
06aa7afa JK |
874 | s32 signal, gfp_t gfp) |
875 | { | |
9caf0364 JB |
876 | struct cfg80211_bss_ies *ies; |
877 | struct cfg80211_internal_bss tmp = {}, *res; | |
06aa7afa JK |
878 | |
879 | if (WARN_ON(!wiphy)) | |
880 | return NULL; | |
881 | ||
22fe88d3 | 882 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
06aa7afa JK |
883 | (signal < 0 || signal > 100))) |
884 | return NULL; | |
885 | ||
0172bb75 JB |
886 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel); |
887 | if (!channel) | |
888 | return NULL; | |
889 | ||
9caf0364 JB |
890 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
891 | tmp.pub.channel = channel; | |
892 | tmp.pub.signal = signal; | |
9caf0364 JB |
893 | tmp.pub.beacon_interval = beacon_interval; |
894 | tmp.pub.capability = capability; | |
34a6eddb JM |
895 | /* |
896 | * Since we do not know here whether the IEs are from a Beacon or Probe | |
897 | * Response frame, we need to pick one of the options and only use it | |
898 | * with the driver that does not provide the full Beacon/Probe Response | |
899 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 900 | * override the IEs pointer should we have received an earlier |
9caf0364 | 901 | * indication of Probe Response data. |
34a6eddb | 902 | */ |
9caf0364 JB |
903 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
904 | if (!ies) | |
905 | return NULL; | |
906 | ies->len = ielen; | |
8cef2c9d | 907 | ies->tsf = tsf; |
9caf0364 | 908 | memcpy(ies->data, ie, ielen); |
06aa7afa | 909 | |
9caf0364 JB |
910 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); |
911 | rcu_assign_pointer(tmp.pub.ies, ies); | |
06aa7afa | 912 | |
9caf0364 | 913 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); |
06aa7afa JK |
914 | if (!res) |
915 | return NULL; | |
916 | ||
917 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
918 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
919 | ||
4ee3e063 | 920 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
921 | /* cfg80211_bss_update gives us a referenced result */ |
922 | return &res->pub; | |
923 | } | |
924 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
925 | ||
2a519311 JB |
926 | struct cfg80211_bss * |
927 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
928 | struct ieee80211_channel *channel, | |
929 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 930 | s32 signal, gfp_t gfp) |
2a519311 | 931 | { |
9caf0364 JB |
932 | struct cfg80211_internal_bss tmp = {}, *res; |
933 | struct cfg80211_bss_ies *ies; | |
2a519311 JB |
934 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
935 | u.probe_resp.variable); | |
bef9bacc | 936 | |
0172bb75 JB |
937 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
938 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
939 | ||
4ee3e063 BL |
940 | trace_cfg80211_inform_bss_frame(wiphy, channel, mgmt, len, signal); |
941 | ||
bef9bacc MK |
942 | if (WARN_ON(!mgmt)) |
943 | return NULL; | |
944 | ||
945 | if (WARN_ON(!wiphy)) | |
946 | return NULL; | |
2a519311 | 947 | |
22fe88d3 | 948 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
768be59f | 949 | (signal < 0 || signal > 100))) |
2a519311 JB |
950 | return NULL; |
951 | ||
bef9bacc | 952 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
953 | return NULL; |
954 | ||
0172bb75 JB |
955 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
956 | ielen, channel); | |
957 | if (!channel) | |
958 | return NULL; | |
959 | ||
9caf0364 JB |
960 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
961 | if (!ies) | |
2a519311 | 962 | return NULL; |
9caf0364 | 963 | ies->len = ielen; |
8cef2c9d | 964 | ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); |
9caf0364 | 965 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); |
2a519311 | 966 | |
9caf0364 JB |
967 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
968 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
969 | else | |
970 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
971 | rcu_assign_pointer(tmp.pub.ies, ies); | |
972 | ||
973 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); | |
974 | tmp.pub.channel = channel; | |
975 | tmp.pub.signal = signal; | |
9caf0364 JB |
976 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); |
977 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
978 | ||
979 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); | |
2a519311 JB |
980 | if (!res) |
981 | return NULL; | |
982 | ||
e38f8a7a LR |
983 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
984 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
985 | ||
4ee3e063 | 986 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
987 | /* cfg80211_bss_update gives us a referenced result */ |
988 | return &res->pub; | |
989 | } | |
990 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
991 | ||
5b112d3d | 992 | void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
4c0c0b75 | 993 | { |
776b3580 | 994 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
4c0c0b75 JB |
995 | struct cfg80211_internal_bss *bss; |
996 | ||
997 | if (!pub) | |
998 | return; | |
999 | ||
1000 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 JB |
1001 | |
1002 | spin_lock_bh(&dev->bss_lock); | |
1003 | bss_ref_get(dev, bss); | |
1004 | spin_unlock_bh(&dev->bss_lock); | |
4c0c0b75 JB |
1005 | } |
1006 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
1007 | ||
5b112d3d | 1008 | void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
2a519311 | 1009 | { |
776b3580 | 1010 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); |
2a519311 JB |
1011 | struct cfg80211_internal_bss *bss; |
1012 | ||
1013 | if (!pub) | |
1014 | return; | |
1015 | ||
1016 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
776b3580 JB |
1017 | |
1018 | spin_lock_bh(&dev->bss_lock); | |
1019 | bss_ref_put(dev, bss); | |
1020 | spin_unlock_bh(&dev->bss_lock); | |
2a519311 JB |
1021 | } |
1022 | EXPORT_SYMBOL(cfg80211_put_bss); | |
1023 | ||
d491af19 JB |
1024 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
1025 | { | |
1026 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
1027 | struct cfg80211_internal_bss *bss; | |
1028 | ||
1029 | if (WARN_ON(!pub)) | |
1030 | return; | |
1031 | ||
1032 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
1033 | ||
1034 | spin_lock_bh(&dev->bss_lock); | |
3207390a | 1035 | if (!list_empty(&bss->list)) { |
776b3580 JB |
1036 | if (__cfg80211_unlink_bss(dev, bss)) |
1037 | dev->bss_generation++; | |
3207390a | 1038 | } |
d491af19 | 1039 | spin_unlock_bh(&dev->bss_lock); |
d491af19 JB |
1040 | } |
1041 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
1042 | ||
3d23e349 | 1043 | #ifdef CONFIG_CFG80211_WEXT |
9f419f38 JB |
1044 | static struct cfg80211_registered_device * |
1045 | cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) | |
1046 | { | |
5fe231e8 | 1047 | struct cfg80211_registered_device *rdev; |
9f419f38 JB |
1048 | struct net_device *dev; |
1049 | ||
5fe231e8 JB |
1050 | ASSERT_RTNL(); |
1051 | ||
9f419f38 JB |
1052 | dev = dev_get_by_index(net, ifindex); |
1053 | if (!dev) | |
5fe231e8 JB |
1054 | return ERR_PTR(-ENODEV); |
1055 | if (dev->ieee80211_ptr) | |
9f419f38 | 1056 | rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy); |
5fe231e8 | 1057 | else |
9f419f38 JB |
1058 | rdev = ERR_PTR(-ENODEV); |
1059 | dev_put(dev); | |
9f419f38 JB |
1060 | return rdev; |
1061 | } | |
1062 | ||
2a519311 JB |
1063 | int cfg80211_wext_siwscan(struct net_device *dev, |
1064 | struct iw_request_info *info, | |
1065 | union iwreq_data *wrqu, char *extra) | |
1066 | { | |
1067 | struct cfg80211_registered_device *rdev; | |
1068 | struct wiphy *wiphy; | |
1069 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 1070 | struct cfg80211_scan_request *creq = NULL; |
2a519311 JB |
1071 | int i, err, n_channels = 0; |
1072 | enum ieee80211_band band; | |
1073 | ||
1074 | if (!netif_running(dev)) | |
1075 | return -ENETDOWN; | |
1076 | ||
b2e3abdc HS |
1077 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
1078 | wreq = (struct iw_scan_req *)extra; | |
1079 | ||
463d0183 | 1080 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1081 | |
1082 | if (IS_ERR(rdev)) | |
1083 | return PTR_ERR(rdev); | |
1084 | ||
1085 | if (rdev->scan_req) { | |
1086 | err = -EBUSY; | |
1087 | goto out; | |
1088 | } | |
1089 | ||
1090 | wiphy = &rdev->wiphy; | |
1091 | ||
b2e3abdc HS |
1092 | /* Determine number of channels, needed to allocate creq */ |
1093 | if (wreq && wreq->num_channels) | |
1094 | n_channels = wreq->num_channels; | |
1095 | else { | |
1096 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
1097 | if (wiphy->bands[band]) | |
1098 | n_channels += wiphy->bands[band]->n_channels; | |
1099 | } | |
2a519311 JB |
1100 | |
1101 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1102 | n_channels * sizeof(void *), | |
1103 | GFP_ATOMIC); | |
1104 | if (!creq) { | |
1105 | err = -ENOMEM; | |
1106 | goto out; | |
1107 | } | |
1108 | ||
1109 | creq->wiphy = wiphy; | |
fd014284 | 1110 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1111 | /* SSIDs come after channels */ |
1112 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1113 | creq->n_channels = n_channels; |
1114 | creq->n_ssids = 1; | |
15d6030b | 1115 | creq->scan_start = jiffies; |
2a519311 | 1116 | |
b2e3abdc | 1117 | /* translate "Scan on frequencies" request */ |
2a519311 JB |
1118 | i = 0; |
1119 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1120 | int j; | |
584991dc | 1121 | |
2a519311 JB |
1122 | if (!wiphy->bands[band]) |
1123 | continue; | |
584991dc | 1124 | |
2a519311 | 1125 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1126 | /* ignore disabled channels */ |
1127 | if (wiphy->bands[band]->channels[j].flags & | |
1128 | IEEE80211_CHAN_DISABLED) | |
1129 | continue; | |
b2e3abdc HS |
1130 | |
1131 | /* If we have a wireless request structure and the | |
1132 | * wireless request specifies frequencies, then search | |
1133 | * for the matching hardware channel. | |
1134 | */ | |
1135 | if (wreq && wreq->num_channels) { | |
1136 | int k; | |
1137 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1138 | for (k = 0; k < wreq->num_channels; k++) { | |
a4e7b730 | 1139 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
b2e3abdc HS |
1140 | if (wext_freq == wiphy_freq) |
1141 | goto wext_freq_found; | |
1142 | } | |
1143 | goto wext_freq_not_found; | |
1144 | } | |
1145 | ||
1146 | wext_freq_found: | |
2a519311 JB |
1147 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1148 | i++; | |
b2e3abdc | 1149 | wext_freq_not_found: ; |
2a519311 JB |
1150 | } |
1151 | } | |
8862dc5f HS |
1152 | /* No channels found? */ |
1153 | if (!i) { | |
1154 | err = -EINVAL; | |
1155 | goto out; | |
1156 | } | |
2a519311 | 1157 | |
b2e3abdc HS |
1158 | /* Set real number of channels specified in creq->channels[] */ |
1159 | creq->n_channels = i; | |
2a519311 | 1160 | |
b2e3abdc HS |
1161 | /* translate "Scan for SSID" request */ |
1162 | if (wreq) { | |
2a519311 | 1163 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1164 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1165 | err = -EINVAL; | |
1166 | goto out; | |
1167 | } | |
2a519311 JB |
1168 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1169 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1170 | } | |
1171 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1172 | creq->n_ssids = 0; | |
1173 | } | |
1174 | ||
34850ab2 | 1175 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
a401d2bb JB |
1176 | if (wiphy->bands[i]) |
1177 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1178 | |
2a519311 | 1179 | rdev->scan_req = creq; |
e35e4d28 | 1180 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1181 | if (err) { |
1182 | rdev->scan_req = NULL; | |
65486c8b | 1183 | /* creq will be freed below */ |
463d0183 | 1184 | } else { |
fd014284 | 1185 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1186 | /* creq now owned by driver */ |
1187 | creq = NULL; | |
463d0183 JB |
1188 | dev_hold(dev); |
1189 | } | |
2a519311 | 1190 | out: |
65486c8b | 1191 | kfree(creq); |
2a519311 JB |
1192 | return err; |
1193 | } | |
ba44cb72 | 1194 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
1195 | |
1196 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
9caf0364 | 1197 | const struct cfg80211_bss_ies *ies, |
2a519311 JB |
1198 | char **current_ev, char *end_buf) |
1199 | { | |
9caf0364 | 1200 | const u8 *pos, *end, *next; |
2a519311 JB |
1201 | struct iw_event iwe; |
1202 | ||
9caf0364 | 1203 | if (!ies) |
2a519311 JB |
1204 | return; |
1205 | ||
1206 | /* | |
1207 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1208 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1209 | */ | |
9caf0364 JB |
1210 | pos = ies->data; |
1211 | end = pos + ies->len; | |
2a519311 JB |
1212 | |
1213 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1214 | next = pos + 2 + pos[1]; | |
1215 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1216 | next = next + 2 + next[1]; | |
1217 | ||
1218 | memset(&iwe, 0, sizeof(iwe)); | |
1219 | iwe.cmd = IWEVGENIE; | |
1220 | iwe.u.data.length = next - pos; | |
1221 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
9caf0364 JB |
1222 | end_buf, &iwe, |
1223 | (void *)pos); | |
2a519311 JB |
1224 | |
1225 | pos = next; | |
1226 | } | |
1227 | ||
1228 | if (end > pos) { | |
1229 | memset(&iwe, 0, sizeof(iwe)); | |
1230 | iwe.cmd = IWEVGENIE; | |
1231 | iwe.u.data.length = end - pos; | |
1232 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
9caf0364 JB |
1233 | end_buf, &iwe, |
1234 | (void *)pos); | |
2a519311 JB |
1235 | } |
1236 | } | |
1237 | ||
2a519311 | 1238 | static char * |
77965c97 JB |
1239 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1240 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1241 | char *end_buf) | |
2a519311 | 1242 | { |
9caf0364 | 1243 | const struct cfg80211_bss_ies *ies; |
2a519311 | 1244 | struct iw_event iwe; |
9caf0364 | 1245 | const u8 *ie; |
2a519311 | 1246 | u8 *buf, *cfg, *p; |
9caf0364 | 1247 | int rem, i, sig; |
2a519311 JB |
1248 | bool ismesh = false; |
1249 | ||
1250 | memset(&iwe, 0, sizeof(iwe)); | |
1251 | iwe.cmd = SIOCGIWAP; | |
1252 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1253 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
1254 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1255 | IW_EV_ADDR_LEN); | |
1256 | ||
1257 | memset(&iwe, 0, sizeof(iwe)); | |
1258 | iwe.cmd = SIOCGIWFREQ; | |
1259 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1260 | iwe.u.freq.e = 0; | |
1261 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1262 | IW_EV_FREQ_LEN); | |
1263 | ||
1264 | memset(&iwe, 0, sizeof(iwe)); | |
1265 | iwe.cmd = SIOCGIWFREQ; | |
1266 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1267 | iwe.u.freq.e = 6; | |
1268 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1269 | IW_EV_FREQ_LEN); | |
1270 | ||
77965c97 | 1271 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1272 | memset(&iwe, 0, sizeof(iwe)); |
1273 | iwe.cmd = IWEVQUAL; | |
1274 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1275 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1276 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1277 | switch (wiphy->signal_type) { |
2a519311 | 1278 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1279 | sig = bss->pub.signal / 100; |
1280 | iwe.u.qual.level = sig; | |
2a519311 | 1281 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1282 | if (sig < -110) /* rather bad */ |
1283 | sig = -110; | |
1284 | else if (sig > -40) /* perfect */ | |
1285 | sig = -40; | |
1286 | /* will give a range of 0 .. 70 */ | |
1287 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1288 | break; |
1289 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1290 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1291 | /* will give range 0 .. 100 */ |
1292 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1293 | break; |
1294 | default: | |
1295 | /* not reached */ | |
1296 | break; | |
1297 | } | |
1298 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1299 | &iwe, IW_EV_QUAL_LEN); | |
1300 | } | |
1301 | ||
1302 | memset(&iwe, 0, sizeof(iwe)); | |
1303 | iwe.cmd = SIOCGIWENCODE; | |
1304 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1305 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1306 | else | |
1307 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1308 | iwe.u.data.length = 0; | |
1309 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1310 | &iwe, ""); | |
1311 | ||
9caf0364 JB |
1312 | rcu_read_lock(); |
1313 | ies = rcu_dereference(bss->pub.ies); | |
83c7aa1a JB |
1314 | rem = ies->len; |
1315 | ie = ies->data; | |
9caf0364 | 1316 | |
83c7aa1a | 1317 | while (rem >= 2) { |
2a519311 JB |
1318 | /* invalid data */ |
1319 | if (ie[1] > rem - 2) | |
1320 | break; | |
1321 | ||
1322 | switch (ie[0]) { | |
1323 | case WLAN_EID_SSID: | |
1324 | memset(&iwe, 0, sizeof(iwe)); | |
1325 | iwe.cmd = SIOCGIWESSID; | |
1326 | iwe.u.data.length = ie[1]; | |
1327 | iwe.u.data.flags = 1; | |
1328 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
9caf0364 | 1329 | &iwe, (u8 *)ie + 2); |
2a519311 JB |
1330 | break; |
1331 | case WLAN_EID_MESH_ID: | |
1332 | memset(&iwe, 0, sizeof(iwe)); | |
1333 | iwe.cmd = SIOCGIWESSID; | |
1334 | iwe.u.data.length = ie[1]; | |
1335 | iwe.u.data.flags = 1; | |
1336 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
9caf0364 | 1337 | &iwe, (u8 *)ie + 2); |
2a519311 JB |
1338 | break; |
1339 | case WLAN_EID_MESH_CONFIG: | |
1340 | ismesh = true; | |
136cfa28 | 1341 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
1342 | break; |
1343 | buf = kmalloc(50, GFP_ATOMIC); | |
1344 | if (!buf) | |
1345 | break; | |
9caf0364 | 1346 | cfg = (u8 *)ie + 2; |
2a519311 JB |
1347 | memset(&iwe, 0, sizeof(iwe)); |
1348 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1349 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1350 | "0x%02X", cfg[0]); | |
2a519311 JB |
1351 | iwe.u.data.length = strlen(buf); |
1352 | current_ev = iwe_stream_add_point(info, current_ev, | |
1353 | end_buf, | |
1354 | &iwe, buf); | |
76aa5e70 RP |
1355 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1356 | cfg[1]); | |
2a519311 JB |
1357 | iwe.u.data.length = strlen(buf); |
1358 | current_ev = iwe_stream_add_point(info, current_ev, | |
1359 | end_buf, | |
1360 | &iwe, buf); | |
76aa5e70 RP |
1361 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1362 | cfg[2]); | |
2a519311 JB |
1363 | iwe.u.data.length = strlen(buf); |
1364 | current_ev = iwe_stream_add_point(info, current_ev, | |
1365 | end_buf, | |
1366 | &iwe, buf); | |
76aa5e70 | 1367 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 JB |
1368 | iwe.u.data.length = strlen(buf); |
1369 | current_ev = iwe_stream_add_point(info, current_ev, | |
1370 | end_buf, | |
1371 | &iwe, buf); | |
76aa5e70 RP |
1372 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1373 | iwe.u.data.length = strlen(buf); | |
1374 | current_ev = iwe_stream_add_point(info, current_ev, | |
1375 | end_buf, | |
1376 | &iwe, buf); | |
1377 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); | |
1378 | iwe.u.data.length = strlen(buf); | |
1379 | current_ev = iwe_stream_add_point(info, current_ev, | |
1380 | end_buf, | |
1381 | &iwe, buf); | |
1382 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); | |
2a519311 JB |
1383 | iwe.u.data.length = strlen(buf); |
1384 | current_ev = iwe_stream_add_point(info, current_ev, | |
1385 | end_buf, | |
1386 | &iwe, buf); | |
1387 | kfree(buf); | |
1388 | break; | |
1389 | case WLAN_EID_SUPP_RATES: | |
1390 | case WLAN_EID_EXT_SUPP_RATES: | |
1391 | /* display all supported rates in readable format */ | |
1392 | p = current_ev + iwe_stream_lcp_len(info); | |
1393 | ||
1394 | memset(&iwe, 0, sizeof(iwe)); | |
1395 | iwe.cmd = SIOCGIWRATE; | |
1396 | /* Those two flags are ignored... */ | |
1397 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1398 | ||
1399 | for (i = 0; i < ie[1]; i++) { | |
1400 | iwe.u.bitrate.value = | |
1401 | ((ie[i + 2] & 0x7f) * 500000); | |
1402 | p = iwe_stream_add_value(info, current_ev, p, | |
1403 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
1404 | } | |
1405 | current_ev = p; | |
1406 | break; | |
1407 | } | |
1408 | rem -= ie[1] + 2; | |
1409 | ie += ie[1] + 2; | |
1410 | } | |
1411 | ||
f64f9e71 JP |
1412 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1413 | ismesh) { | |
2a519311 JB |
1414 | memset(&iwe, 0, sizeof(iwe)); |
1415 | iwe.cmd = SIOCGIWMODE; | |
1416 | if (ismesh) | |
1417 | iwe.u.mode = IW_MODE_MESH; | |
1418 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1419 | iwe.u.mode = IW_MODE_MASTER; | |
1420 | else | |
1421 | iwe.u.mode = IW_MODE_ADHOC; | |
1422 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1423 | &iwe, IW_EV_UINT_LEN); | |
1424 | } | |
1425 | ||
c49dc900 | 1426 | buf = kmalloc(31, GFP_ATOMIC); |
2a519311 JB |
1427 | if (buf) { |
1428 | memset(&iwe, 0, sizeof(iwe)); | |
1429 | iwe.cmd = IWEVCUSTOM; | |
8cef2c9d | 1430 | sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf)); |
2a519311 JB |
1431 | iwe.u.data.length = strlen(buf); |
1432 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1433 | &iwe, buf); | |
1434 | memset(&iwe, 0, sizeof(iwe)); | |
1435 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
1436 | sprintf(buf, " Last beacon: %ums ago", |
1437 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
1438 | iwe.u.data.length = strlen(buf); |
1439 | current_ev = iwe_stream_add_point(info, current_ev, | |
1440 | end_buf, &iwe, buf); | |
1441 | kfree(buf); | |
1442 | } | |
1443 | ||
9caf0364 JB |
1444 | ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); |
1445 | rcu_read_unlock(); | |
2a519311 JB |
1446 | |
1447 | return current_ev; | |
1448 | } | |
1449 | ||
1450 | ||
1451 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
1452 | struct iw_request_info *info, | |
1453 | char *buf, size_t len) | |
1454 | { | |
1455 | char *current_ev = buf; | |
1456 | char *end_buf = buf + len; | |
1457 | struct cfg80211_internal_bss *bss; | |
1458 | ||
1459 | spin_lock_bh(&dev->bss_lock); | |
1460 | cfg80211_bss_expire(dev); | |
1461 | ||
1462 | list_for_each_entry(bss, &dev->bss_list, list) { | |
1463 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
1464 | spin_unlock_bh(&dev->bss_lock); | |
1465 | return -E2BIG; | |
1466 | } | |
77965c97 JB |
1467 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
1468 | current_ev, end_buf); | |
2a519311 JB |
1469 | } |
1470 | spin_unlock_bh(&dev->bss_lock); | |
1471 | return current_ev - buf; | |
1472 | } | |
1473 | ||
1474 | ||
1475 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1476 | struct iw_request_info *info, | |
1477 | struct iw_point *data, char *extra) | |
1478 | { | |
1479 | struct cfg80211_registered_device *rdev; | |
1480 | int res; | |
1481 | ||
1482 | if (!netif_running(dev)) | |
1483 | return -ENETDOWN; | |
1484 | ||
463d0183 | 1485 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1486 | |
1487 | if (IS_ERR(rdev)) | |
1488 | return PTR_ERR(rdev); | |
1489 | ||
5fe231e8 JB |
1490 | if (rdev->scan_req) |
1491 | return -EAGAIN; | |
2a519311 JB |
1492 | |
1493 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1494 | data->length = 0; | |
1495 | if (res >= 0) { | |
1496 | data->length = res; | |
1497 | res = 0; | |
1498 | } | |
1499 | ||
2a519311 JB |
1500 | return res; |
1501 | } | |
ba44cb72 | 1502 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 1503 | #endif |