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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 | |
f9616e0f | 22 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 23 | |
e8e27c66 AK |
24 | static void bss_release(struct kref *ref) |
25 | { | |
9caf0364 | 26 | struct cfg80211_bss_ies *ies; |
e8e27c66 AK |
27 | struct cfg80211_internal_bss *bss; |
28 | ||
29 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
b629ea3d JB |
30 | |
31 | if (WARN_ON(atomic_read(&bss->hold))) | |
32 | return; | |
33 | ||
9caf0364 JB |
34 | ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); |
35 | if (ies) | |
36 | kfree_rcu(ies, rcu_head); | |
37 | ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); | |
38 | if (ies) | |
39 | kfree_rcu(ies, rcu_head); | |
e8e27c66 | 40 | |
e8e27c66 AK |
41 | kfree(bss); |
42 | } | |
43 | ||
0532d4f1 JB |
44 | static inline void bss_ref_get(struct cfg80211_internal_bss *bss) |
45 | { | |
46 | kref_get(&bss->ref); | |
47 | } | |
48 | ||
49 | static inline void bss_ref_put(struct cfg80211_internal_bss *bss) | |
50 | { | |
51 | kref_put(&bss->ref, bss_release); | |
52 | } | |
53 | ||
e8e27c66 AK |
54 | static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, |
55 | struct cfg80211_internal_bss *bss) | |
56 | { | |
4b1af479 JB |
57 | lockdep_assert_held(&dev->bss_lock); |
58 | ||
e8e27c66 AK |
59 | list_del_init(&bss->list); |
60 | rb_erase(&bss->rbn, &dev->bss_tree); | |
0532d4f1 | 61 | bss_ref_put(bss); |
e8e27c66 AK |
62 | } |
63 | ||
15d6030b SL |
64 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev, |
65 | unsigned long expire_time) | |
66 | { | |
67 | struct cfg80211_internal_bss *bss, *tmp; | |
68 | bool expired = false; | |
69 | ||
4b1af479 JB |
70 | lockdep_assert_held(&dev->bss_lock); |
71 | ||
15d6030b SL |
72 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { |
73 | if (atomic_read(&bss->hold)) | |
74 | continue; | |
75 | if (!time_after(expire_time, bss->ts)) | |
76 | continue; | |
77 | ||
78 | __cfg80211_unlink_bss(dev, bss); | |
79 | expired = true; | |
80 | } | |
81 | ||
82 | if (expired) | |
83 | dev->bss_generation++; | |
84 | } | |
85 | ||
01a0ac41 | 86 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) |
2a519311 | 87 | { |
667503dd | 88 | struct cfg80211_scan_request *request; |
fd014284 | 89 | struct wireless_dev *wdev; |
3d23e349 | 90 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
91 | union iwreq_data wrqu; |
92 | #endif | |
93 | ||
01a0ac41 JB |
94 | ASSERT_RDEV_LOCK(rdev); |
95 | ||
667503dd JB |
96 | request = rdev->scan_req; |
97 | ||
01a0ac41 JB |
98 | if (!request) |
99 | return; | |
100 | ||
fd014284 | 101 | wdev = request->wdev; |
2a519311 | 102 | |
6829c878 JB |
103 | /* |
104 | * This must be before sending the other events! | |
105 | * Otherwise, wpa_supplicant gets completely confused with | |
106 | * wext events. | |
107 | */ | |
fd014284 JB |
108 | if (wdev->netdev) |
109 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 110 | |
15d6030b | 111 | if (request->aborted) { |
fd014284 | 112 | nl80211_send_scan_aborted(rdev, wdev); |
15d6030b SL |
113 | } else { |
114 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
115 | /* flush entries from previous scans */ | |
116 | spin_lock_bh(&rdev->bss_lock); | |
117 | __cfg80211_bss_expire(rdev, request->scan_start); | |
118 | spin_unlock_bh(&rdev->bss_lock); | |
119 | } | |
fd014284 | 120 | nl80211_send_scan_done(rdev, wdev); |
15d6030b | 121 | } |
2a519311 | 122 | |
3d23e349 | 123 | #ifdef CONFIG_CFG80211_WEXT |
fd014284 | 124 | if (wdev->netdev && !request->aborted) { |
2a519311 JB |
125 | memset(&wrqu, 0, sizeof(wrqu)); |
126 | ||
fd014284 | 127 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
128 | } |
129 | #endif | |
130 | ||
fd014284 JB |
131 | if (wdev->netdev) |
132 | dev_put(wdev->netdev); | |
2a519311 | 133 | |
36e6fea8 | 134 | rdev->scan_req = NULL; |
01a0ac41 JB |
135 | |
136 | /* | |
137 | * OK. If this is invoked with "leak" then we can't | |
138 | * free this ... but we've cleaned it up anyway. The | |
139 | * driver failed to call the scan_done callback, so | |
140 | * all bets are off, it might still be trying to use | |
141 | * the scan request or not ... if it accesses the dev | |
142 | * in there (it shouldn't anyway) then it may crash. | |
143 | */ | |
144 | if (!leak) | |
145 | kfree(request); | |
2a519311 | 146 | } |
667503dd | 147 | |
36e6fea8 JB |
148 | void __cfg80211_scan_done(struct work_struct *wk) |
149 | { | |
150 | struct cfg80211_registered_device *rdev; | |
151 | ||
152 | rdev = container_of(wk, struct cfg80211_registered_device, | |
153 | scan_done_wk); | |
154 | ||
155 | cfg80211_lock_rdev(rdev); | |
01a0ac41 | 156 | ___cfg80211_scan_done(rdev, false); |
36e6fea8 JB |
157 | cfg80211_unlock_rdev(rdev); |
158 | } | |
159 | ||
667503dd JB |
160 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
161 | { | |
4ee3e063 | 162 | trace_cfg80211_scan_done(request, aborted); |
667503dd JB |
163 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
164 | ||
165 | request->aborted = aborted; | |
e60d7443 | 166 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
667503dd | 167 | } |
2a519311 JB |
168 | EXPORT_SYMBOL(cfg80211_scan_done); |
169 | ||
807f8a8c LC |
170 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
171 | { | |
172 | struct cfg80211_registered_device *rdev; | |
15d6030b | 173 | struct cfg80211_sched_scan_request *request; |
807f8a8c LC |
174 | |
175 | rdev = container_of(wk, struct cfg80211_registered_device, | |
176 | sched_scan_results_wk); | |
177 | ||
15d6030b SL |
178 | request = rdev->sched_scan_req; |
179 | ||
c10841ca | 180 | mutex_lock(&rdev->sched_scan_mtx); |
807f8a8c LC |
181 | |
182 | /* we don't have sched_scan_req anymore if the scan is stopping */ | |
15d6030b SL |
183 | if (request) { |
184 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
185 | /* flush entries from previous scans */ | |
186 | spin_lock_bh(&rdev->bss_lock); | |
187 | __cfg80211_bss_expire(rdev, request->scan_start); | |
188 | spin_unlock_bh(&rdev->bss_lock); | |
189 | request->scan_start = | |
190 | jiffies + msecs_to_jiffies(request->interval); | |
191 | } | |
192 | nl80211_send_sched_scan_results(rdev, request->dev); | |
193 | } | |
807f8a8c | 194 | |
c10841ca | 195 | mutex_unlock(&rdev->sched_scan_mtx); |
807f8a8c LC |
196 | } |
197 | ||
198 | void cfg80211_sched_scan_results(struct wiphy *wiphy) | |
199 | { | |
4ee3e063 | 200 | trace_cfg80211_sched_scan_results(wiphy); |
807f8a8c LC |
201 | /* ignore if we're not scanning */ |
202 | if (wiphy_to_dev(wiphy)->sched_scan_req) | |
203 | queue_work(cfg80211_wq, | |
204 | &wiphy_to_dev(wiphy)->sched_scan_results_wk); | |
205 | } | |
206 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
207 | ||
85a9994a | 208 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) |
807f8a8c | 209 | { |
85a9994a | 210 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
807f8a8c | 211 | |
4ee3e063 BL |
212 | trace_cfg80211_sched_scan_stopped(wiphy); |
213 | ||
c10841ca | 214 | mutex_lock(&rdev->sched_scan_mtx); |
807f8a8c | 215 | __cfg80211_stop_sched_scan(rdev, true); |
c10841ca | 216 | mutex_unlock(&rdev->sched_scan_mtx); |
807f8a8c | 217 | } |
807f8a8c LC |
218 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
219 | ||
220 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, | |
221 | bool driver_initiated) | |
222 | { | |
807f8a8c LC |
223 | struct net_device *dev; |
224 | ||
c10841ca | 225 | lockdep_assert_held(&rdev->sched_scan_mtx); |
807f8a8c LC |
226 | |
227 | if (!rdev->sched_scan_req) | |
1a84ff75 | 228 | return -ENOENT; |
807f8a8c LC |
229 | |
230 | dev = rdev->sched_scan_req->dev; | |
231 | ||
85a9994a | 232 | if (!driver_initiated) { |
e35e4d28 | 233 | int err = rdev_sched_scan_stop(rdev, dev); |
85a9994a LC |
234 | if (err) |
235 | return err; | |
236 | } | |
807f8a8c LC |
237 | |
238 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); | |
239 | ||
240 | kfree(rdev->sched_scan_req); | |
241 | rdev->sched_scan_req = NULL; | |
242 | ||
3b4670ff | 243 | return 0; |
807f8a8c LC |
244 | } |
245 | ||
cb3a8eec DW |
246 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, |
247 | unsigned long age_secs) | |
248 | { | |
249 | struct cfg80211_internal_bss *bss; | |
250 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
251 | ||
2ca813ad | 252 | spin_lock_bh(&dev->bss_lock); |
915de2ff | 253 | list_for_each_entry(bss, &dev->bss_list, list) |
cb3a8eec | 254 | bss->ts -= age_jiffies; |
2ca813ad | 255 | spin_unlock_bh(&dev->bss_lock); |
cb3a8eec DW |
256 | } |
257 | ||
2a519311 JB |
258 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) |
259 | { | |
15d6030b | 260 | __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
261 | } |
262 | ||
c21dbf92 | 263 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
2a519311 | 264 | { |
c21dbf92 | 265 | while (len > 2 && ies[0] != eid) { |
2a519311 JB |
266 | len -= ies[1] + 2; |
267 | ies += ies[1] + 2; | |
268 | } | |
269 | if (len < 2) | |
270 | return NULL; | |
271 | if (len < 2 + ies[1]) | |
272 | return NULL; | |
273 | return ies; | |
274 | } | |
c21dbf92 | 275 | EXPORT_SYMBOL(cfg80211_find_ie); |
2a519311 | 276 | |
0c28ec58 EP |
277 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, |
278 | const u8 *ies, int len) | |
279 | { | |
280 | struct ieee80211_vendor_ie *ie; | |
281 | const u8 *pos = ies, *end = ies + len; | |
282 | int ie_oui; | |
283 | ||
284 | while (pos < end) { | |
285 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, | |
286 | end - pos); | |
287 | if (!pos) | |
288 | return NULL; | |
289 | ||
290 | if (end - pos < sizeof(*ie)) | |
291 | return NULL; | |
292 | ||
293 | ie = (struct ieee80211_vendor_ie *)pos; | |
294 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; | |
295 | if (ie_oui == oui && ie->oui_type == oui_type) | |
296 | return pos; | |
297 | ||
298 | pos += 2 + ie->len; | |
299 | } | |
300 | return NULL; | |
301 | } | |
302 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
303 | ||
915de2ff | 304 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
2a519311 JB |
305 | const u8 *ssid, size_t ssid_len) |
306 | { | |
9caf0364 | 307 | const struct cfg80211_bss_ies *ies; |
2a519311 JB |
308 | const u8 *ssidie; |
309 | ||
ac422d3c | 310 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
311 | return false; |
312 | ||
79420f09 JB |
313 | if (!ssid) |
314 | return true; | |
315 | ||
9caf0364 JB |
316 | ies = rcu_access_pointer(a->ies); |
317 | if (!ies) | |
318 | return false; | |
319 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); | |
2a519311 JB |
320 | if (!ssidie) |
321 | return false; | |
322 | if (ssidie[1] != ssid_len) | |
323 | return false; | |
324 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
325 | } | |
326 | ||
4593c4cb JB |
327 | /** |
328 | * enum bss_compare_mode - BSS compare mode | |
329 | * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) | |
330 | * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode | |
331 | * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode | |
332 | */ | |
333 | enum bss_compare_mode { | |
334 | BSS_CMP_REGULAR, | |
335 | BSS_CMP_HIDE_ZLEN, | |
336 | BSS_CMP_HIDE_NUL, | |
337 | }; | |
338 | ||
dd9dfb9f | 339 | static int cmp_bss(struct cfg80211_bss *a, |
5622f5bb | 340 | struct cfg80211_bss *b, |
4593c4cb | 341 | enum bss_compare_mode mode) |
dd9dfb9f | 342 | { |
9caf0364 | 343 | const struct cfg80211_bss_ies *a_ies, *b_ies; |
3af6341c JB |
344 | const u8 *ie1 = NULL; |
345 | const u8 *ie2 = NULL; | |
5622f5bb | 346 | int i, r; |
dd9dfb9f | 347 | |
3af6341c JB |
348 | if (a->channel != b->channel) |
349 | return b->channel->center_freq - a->channel->center_freq; | |
dd9dfb9f | 350 | |
9caf0364 JB |
351 | a_ies = rcu_access_pointer(a->ies); |
352 | if (!a_ies) | |
353 | return -1; | |
354 | b_ies = rcu_access_pointer(b->ies); | |
355 | if (!b_ies) | |
356 | return 1; | |
357 | ||
3af6341c JB |
358 | if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
359 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
360 | a_ies->data, a_ies->len); | |
361 | if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) | |
362 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
363 | b_ies->data, b_ies->len); | |
364 | if (ie1 && ie2) { | |
365 | int mesh_id_cmp; | |
366 | ||
367 | if (ie1[1] == ie2[1]) | |
368 | mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
369 | else | |
370 | mesh_id_cmp = ie2[1] - ie1[1]; | |
371 | ||
372 | ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
373 | a_ies->data, a_ies->len); | |
374 | ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
375 | b_ies->data, b_ies->len); | |
376 | if (ie1 && ie2) { | |
377 | if (mesh_id_cmp) | |
378 | return mesh_id_cmp; | |
379 | if (ie1[1] != ie2[1]) | |
380 | return ie2[1] - ie1[1]; | |
381 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); | |
382 | } | |
383 | } | |
384 | ||
385 | /* | |
386 | * we can't use compare_ether_addr here since we need a < > operator. | |
387 | * The binary return value of compare_ether_addr isn't enough | |
388 | */ | |
389 | r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); | |
390 | if (r) | |
391 | return r; | |
392 | ||
9caf0364 JB |
393 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); |
394 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); | |
dd9dfb9f | 395 | |
5622f5bb JB |
396 | if (!ie1 && !ie2) |
397 | return 0; | |
398 | ||
f94f8b16 | 399 | /* |
5622f5bb JB |
400 | * Note that with "hide_ssid", the function returns a match if |
401 | * the already-present BSS ("b") is a hidden SSID beacon for | |
402 | * the new BSS ("a"). | |
f94f8b16 | 403 | */ |
dd9dfb9f DT |
404 | |
405 | /* sort missing IE before (left of) present IE */ | |
406 | if (!ie1) | |
407 | return -1; | |
408 | if (!ie2) | |
409 | return 1; | |
410 | ||
4593c4cb JB |
411 | switch (mode) { |
412 | case BSS_CMP_HIDE_ZLEN: | |
413 | /* | |
414 | * In ZLEN mode we assume the BSS entry we're | |
415 | * looking for has a zero-length SSID. So if | |
416 | * the one we're looking at right now has that, | |
417 | * return 0. Otherwise, return the difference | |
418 | * in length, but since we're looking for the | |
419 | * 0-length it's really equivalent to returning | |
420 | * the length of the one we're looking at. | |
421 | * | |
422 | * No content comparison is needed as we assume | |
423 | * the content length is zero. | |
424 | */ | |
425 | return ie2[1]; | |
426 | case BSS_CMP_REGULAR: | |
427 | default: | |
428 | /* sort by length first, then by contents */ | |
429 | if (ie1[1] != ie2[1]) | |
430 | return ie2[1] - ie1[1]; | |
5622f5bb | 431 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
4593c4cb JB |
432 | case BSS_CMP_HIDE_NUL: |
433 | if (ie1[1] != ie2[1]) | |
434 | return ie2[1] - ie1[1]; | |
435 | /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ | |
436 | for (i = 0; i < ie2[1]; i++) | |
437 | if (ie2[i + 2]) | |
438 | return -1; | |
439 | return 0; | |
440 | } | |
dd9dfb9f DT |
441 | } |
442 | ||
2a519311 JB |
443 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
444 | struct ieee80211_channel *channel, | |
445 | const u8 *bssid, | |
79420f09 JB |
446 | const u8 *ssid, size_t ssid_len, |
447 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
448 | { |
449 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
450 | struct cfg80211_internal_bss *bss, *res = NULL; | |
ccb6c136 | 451 | unsigned long now = jiffies; |
2a519311 | 452 | |
4ee3e063 BL |
453 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask, |
454 | capa_val); | |
455 | ||
2a519311 JB |
456 | spin_lock_bh(&dev->bss_lock); |
457 | ||
458 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
459 | if ((bss->pub.capability & capa_mask) != capa_val) |
460 | continue; | |
2a519311 JB |
461 | if (channel && bss->pub.channel != channel) |
462 | continue; | |
ccb6c136 JB |
463 | /* Don't get expired BSS structs */ |
464 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
465 | !atomic_read(&bss->hold)) | |
466 | continue; | |
2a519311 JB |
467 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
468 | res = bss; | |
0532d4f1 | 469 | bss_ref_get(res); |
2a519311 JB |
470 | break; |
471 | } | |
472 | } | |
473 | ||
474 | spin_unlock_bh(&dev->bss_lock); | |
475 | if (!res) | |
476 | return NULL; | |
4ee3e063 | 477 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
478 | return &res->pub; |
479 | } | |
480 | EXPORT_SYMBOL(cfg80211_get_bss); | |
481 | ||
2a519311 JB |
482 | static void rb_insert_bss(struct cfg80211_registered_device *dev, |
483 | struct cfg80211_internal_bss *bss) | |
484 | { | |
485 | struct rb_node **p = &dev->bss_tree.rb_node; | |
486 | struct rb_node *parent = NULL; | |
487 | struct cfg80211_internal_bss *tbss; | |
488 | int cmp; | |
489 | ||
490 | while (*p) { | |
491 | parent = *p; | |
492 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
493 | ||
4593c4cb | 494 | cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); |
2a519311 JB |
495 | |
496 | if (WARN_ON(!cmp)) { | |
497 | /* will sort of leak this BSS */ | |
498 | return; | |
499 | } | |
500 | ||
501 | if (cmp < 0) | |
502 | p = &(*p)->rb_left; | |
503 | else | |
504 | p = &(*p)->rb_right; | |
505 | } | |
506 | ||
507 | rb_link_node(&bss->rbn, parent, p); | |
508 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
509 | } | |
510 | ||
511 | static struct cfg80211_internal_bss * | |
512 | rb_find_bss(struct cfg80211_registered_device *dev, | |
5622f5bb | 513 | struct cfg80211_internal_bss *res, |
4593c4cb | 514 | enum bss_compare_mode mode) |
dd9dfb9f DT |
515 | { |
516 | struct rb_node *n = dev->bss_tree.rb_node; | |
517 | struct cfg80211_internal_bss *bss; | |
518 | int r; | |
519 | ||
520 | while (n) { | |
521 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
4593c4cb | 522 | r = cmp_bss(&res->pub, &bss->pub, mode); |
dd9dfb9f DT |
523 | |
524 | if (r == 0) | |
525 | return bss; | |
526 | else if (r < 0) | |
527 | n = n->rb_left; | |
528 | else | |
529 | n = n->rb_right; | |
530 | } | |
531 | ||
532 | return NULL; | |
533 | } | |
534 | ||
535 | static void | |
536 | copy_hidden_ies(struct cfg80211_internal_bss *res, | |
915de2ff | 537 | struct cfg80211_internal_bss *hidden) |
dd9dfb9f | 538 | { |
9caf0364 JB |
539 | const struct cfg80211_bss_ies *ies; |
540 | ||
541 | if (rcu_access_pointer(res->pub.beacon_ies)) | |
dd9dfb9f DT |
542 | return; |
543 | ||
9caf0364 JB |
544 | ies = rcu_access_pointer(hidden->pub.beacon_ies); |
545 | if (WARN_ON(!ies)) | |
dd9dfb9f DT |
546 | return; |
547 | ||
9caf0364 JB |
548 | ies = kmemdup(ies, sizeof(*ies) + ies->len, GFP_ATOMIC); |
549 | if (unlikely(!ies)) | |
550 | return; | |
551 | rcu_assign_pointer(res->pub.beacon_ies, ies); | |
dd9dfb9f DT |
552 | } |
553 | ||
2a519311 JB |
554 | static struct cfg80211_internal_bss * |
555 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
9caf0364 | 556 | struct cfg80211_internal_bss *tmp) |
2a519311 JB |
557 | { |
558 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 | 559 | |
9caf0364 | 560 | if (WARN_ON(!tmp->pub.channel)) |
2a519311 | 561 | return NULL; |
2a519311 | 562 | |
9caf0364 | 563 | tmp->ts = jiffies; |
2a519311 | 564 | |
2a519311 JB |
565 | spin_lock_bh(&dev->bss_lock); |
566 | ||
9caf0364 JB |
567 | if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) { |
568 | spin_unlock_bh(&dev->bss_lock); | |
569 | return NULL; | |
570 | } | |
571 | ||
4593c4cb | 572 | found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR); |
2a519311 | 573 | |
cd1658f5 | 574 | if (found) { |
9caf0364 JB |
575 | found->pub.beacon_interval = tmp->pub.beacon_interval; |
576 | found->pub.tsf = tmp->pub.tsf; | |
577 | found->pub.signal = tmp->pub.signal; | |
578 | found->pub.capability = tmp->pub.capability; | |
579 | found->ts = tmp->ts; | |
cd1658f5 | 580 | |
34a6eddb | 581 | /* Update IEs */ |
9caf0364 JB |
582 | if (rcu_access_pointer(tmp->pub.proberesp_ies)) { |
583 | const struct cfg80211_bss_ies *old; | |
584 | ||
585 | old = rcu_access_pointer(found->pub.proberesp_ies); | |
cd1658f5 | 586 | |
9caf0364 JB |
587 | rcu_assign_pointer(found->pub.proberesp_ies, |
588 | tmp->pub.proberesp_ies); | |
34a6eddb | 589 | /* Override possible earlier Beacon frame IEs */ |
9caf0364 JB |
590 | rcu_assign_pointer(found->pub.ies, |
591 | tmp->pub.proberesp_ies); | |
592 | if (old) | |
593 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
594 | rcu_head); | |
595 | } else if (rcu_access_pointer(tmp->pub.beacon_ies)) { | |
9537f227 | 596 | const struct cfg80211_bss_ies *old; |
915de2ff | 597 | |
9caf0364 | 598 | old = rcu_access_pointer(found->pub.beacon_ies); |
9caf0364 JB |
599 | |
600 | rcu_assign_pointer(found->pub.beacon_ies, | |
601 | tmp->pub.beacon_ies); | |
01123e23 SN |
602 | |
603 | /* Override IEs if they were from a beacon before */ | |
9537f227 | 604 | if (old == rcu_access_pointer(found->pub.ies)) |
9caf0364 JB |
605 | rcu_assign_pointer(found->pub.ies, |
606 | tmp->pub.beacon_ies); | |
cd1658f5 | 607 | |
9caf0364 JB |
608 | if (old) |
609 | kfree_rcu((struct cfg80211_bss_ies *)old, | |
610 | rcu_head); | |
611 | } | |
2a519311 | 612 | } else { |
9caf0364 | 613 | struct cfg80211_internal_bss *new; |
dd9dfb9f | 614 | struct cfg80211_internal_bss *hidden; |
9caf0364 | 615 | struct cfg80211_bss_ies *ies; |
dd9dfb9f DT |
616 | |
617 | /* First check if the beacon is a probe response from | |
618 | * a hidden bss. If so, copy beacon ies (with nullified | |
619 | * ssid) into the probe response bss entry (with real ssid). | |
620 | * It is required basically for PSM implementation | |
621 | * (probe responses do not contain tim ie) */ | |
622 | ||
623 | /* TODO: The code is not trying to update existing probe | |
624 | * response bss entries when beacon ies are | |
625 | * getting changed. */ | |
4593c4cb JB |
626 | hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN); |
627 | if (hidden) { | |
9caf0364 | 628 | copy_hidden_ies(tmp, hidden); |
4593c4cb JB |
629 | } else { |
630 | hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_NUL); | |
631 | if (hidden) | |
632 | copy_hidden_ies(tmp, hidden); | |
633 | } | |
9caf0364 JB |
634 | |
635 | /* | |
636 | * create a copy -- the "res" variable that is passed in | |
637 | * is allocated on the stack since it's not needed in the | |
638 | * more common case of an update | |
639 | */ | |
640 | new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size, | |
641 | GFP_ATOMIC); | |
642 | if (!new) { | |
643 | ies = (void *)rcu_dereference(tmp->pub.beacon_ies); | |
644 | if (ies) | |
645 | kfree_rcu(ies, rcu_head); | |
646 | ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); | |
647 | if (ies) | |
648 | kfree_rcu(ies, rcu_head); | |
649 | spin_unlock_bh(&dev->bss_lock); | |
650 | return NULL; | |
651 | } | |
652 | memcpy(new, tmp, sizeof(*new)); | |
653 | kref_init(&new->ref); | |
654 | list_add_tail(&new->list, &dev->bss_list); | |
655 | rb_insert_bss(dev, new); | |
656 | found = new; | |
2a519311 JB |
657 | } |
658 | ||
659 | dev->bss_generation++; | |
660 | spin_unlock_bh(&dev->bss_lock); | |
661 | ||
0532d4f1 | 662 | bss_ref_get(found); |
2a519311 JB |
663 | return found; |
664 | } | |
665 | ||
0172bb75 JB |
666 | static struct ieee80211_channel * |
667 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
668 | struct ieee80211_channel *channel) | |
669 | { | |
670 | const u8 *tmp; | |
671 | u32 freq; | |
672 | int channel_number = -1; | |
673 | ||
674 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
675 | if (tmp && tmp[1] == 1) { | |
676 | channel_number = tmp[2]; | |
677 | } else { | |
678 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
679 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
680 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
681 | ||
682 | channel_number = htop->primary_chan; | |
683 | } | |
684 | } | |
685 | ||
686 | if (channel_number < 0) | |
687 | return channel; | |
688 | ||
689 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
690 | channel = ieee80211_get_channel(wiphy, freq); | |
691 | if (!channel) | |
692 | return NULL; | |
693 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
694 | return NULL; | |
695 | return channel; | |
696 | } | |
697 | ||
06aa7afa JK |
698 | struct cfg80211_bss* |
699 | cfg80211_inform_bss(struct wiphy *wiphy, | |
700 | struct ieee80211_channel *channel, | |
7b8bcff2 JB |
701 | const u8 *bssid, u64 tsf, u16 capability, |
702 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
06aa7afa JK |
703 | s32 signal, gfp_t gfp) |
704 | { | |
9caf0364 JB |
705 | struct cfg80211_bss_ies *ies; |
706 | struct cfg80211_internal_bss tmp = {}, *res; | |
06aa7afa JK |
707 | |
708 | if (WARN_ON(!wiphy)) | |
709 | return NULL; | |
710 | ||
22fe88d3 | 711 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
06aa7afa JK |
712 | (signal < 0 || signal > 100))) |
713 | return NULL; | |
714 | ||
0172bb75 JB |
715 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel); |
716 | if (!channel) | |
717 | return NULL; | |
718 | ||
9caf0364 JB |
719 | memcpy(tmp.pub.bssid, bssid, ETH_ALEN); |
720 | tmp.pub.channel = channel; | |
721 | tmp.pub.signal = signal; | |
722 | tmp.pub.tsf = tsf; | |
723 | tmp.pub.beacon_interval = beacon_interval; | |
724 | tmp.pub.capability = capability; | |
34a6eddb JM |
725 | /* |
726 | * Since we do not know here whether the IEs are from a Beacon or Probe | |
727 | * Response frame, we need to pick one of the options and only use it | |
728 | * with the driver that does not provide the full Beacon/Probe Response | |
729 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
50521aa8 | 730 | * override the IEs pointer should we have received an earlier |
9caf0364 | 731 | * indication of Probe Response data. |
34a6eddb | 732 | */ |
9caf0364 JB |
733 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
734 | if (!ies) | |
735 | return NULL; | |
736 | ies->len = ielen; | |
737 | memcpy(ies->data, ie, ielen); | |
06aa7afa | 738 | |
9caf0364 JB |
739 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); |
740 | rcu_assign_pointer(tmp.pub.ies, ies); | |
06aa7afa | 741 | |
9caf0364 | 742 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); |
06aa7afa JK |
743 | if (!res) |
744 | return NULL; | |
745 | ||
746 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
747 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
748 | ||
4ee3e063 | 749 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
750 | /* cfg80211_bss_update gives us a referenced result */ |
751 | return &res->pub; | |
752 | } | |
753 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
754 | ||
2a519311 JB |
755 | struct cfg80211_bss * |
756 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
757 | struct ieee80211_channel *channel, | |
758 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 759 | s32 signal, gfp_t gfp) |
2a519311 | 760 | { |
9caf0364 JB |
761 | struct cfg80211_internal_bss tmp = {}, *res; |
762 | struct cfg80211_bss_ies *ies; | |
2a519311 JB |
763 | size_t ielen = len - offsetof(struct ieee80211_mgmt, |
764 | u.probe_resp.variable); | |
bef9bacc | 765 | |
0172bb75 JB |
766 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
767 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
768 | ||
4ee3e063 BL |
769 | trace_cfg80211_inform_bss_frame(wiphy, channel, mgmt, len, signal); |
770 | ||
bef9bacc MK |
771 | if (WARN_ON(!mgmt)) |
772 | return NULL; | |
773 | ||
774 | if (WARN_ON(!wiphy)) | |
775 | return NULL; | |
2a519311 | 776 | |
22fe88d3 | 777 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
768be59f | 778 | (signal < 0 || signal > 100))) |
2a519311 JB |
779 | return NULL; |
780 | ||
bef9bacc | 781 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
782 | return NULL; |
783 | ||
0172bb75 JB |
784 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
785 | ielen, channel); | |
786 | if (!channel) | |
787 | return NULL; | |
788 | ||
9caf0364 JB |
789 | ies = kmalloc(sizeof(*ies) + ielen, gfp); |
790 | if (!ies) | |
2a519311 | 791 | return NULL; |
9caf0364 JB |
792 | ies->len = ielen; |
793 | memcpy(ies->data, mgmt->u.probe_resp.variable, ielen); | |
2a519311 | 794 | |
9caf0364 JB |
795 | if (ieee80211_is_probe_resp(mgmt->frame_control)) |
796 | rcu_assign_pointer(tmp.pub.proberesp_ies, ies); | |
797 | else | |
798 | rcu_assign_pointer(tmp.pub.beacon_ies, ies); | |
799 | rcu_assign_pointer(tmp.pub.ies, ies); | |
800 | ||
801 | memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN); | |
802 | tmp.pub.channel = channel; | |
803 | tmp.pub.signal = signal; | |
804 | tmp.pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
805 | tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
806 | tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
807 | ||
808 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp); | |
2a519311 JB |
809 | if (!res) |
810 | return NULL; | |
811 | ||
e38f8a7a LR |
812 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
813 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
814 | ||
4ee3e063 | 815 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
816 | /* cfg80211_bss_update gives us a referenced result */ |
817 | return &res->pub; | |
818 | } | |
819 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
820 | ||
4c0c0b75 JB |
821 | void cfg80211_ref_bss(struct cfg80211_bss *pub) |
822 | { | |
823 | struct cfg80211_internal_bss *bss; | |
824 | ||
825 | if (!pub) | |
826 | return; | |
827 | ||
828 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
0532d4f1 | 829 | bss_ref_get(bss); |
4c0c0b75 JB |
830 | } |
831 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
832 | ||
2a519311 JB |
833 | void cfg80211_put_bss(struct cfg80211_bss *pub) |
834 | { | |
835 | struct cfg80211_internal_bss *bss; | |
836 | ||
837 | if (!pub) | |
838 | return; | |
839 | ||
840 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
0532d4f1 | 841 | bss_ref_put(bss); |
2a519311 JB |
842 | } |
843 | EXPORT_SYMBOL(cfg80211_put_bss); | |
844 | ||
d491af19 JB |
845 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
846 | { | |
847 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
848 | struct cfg80211_internal_bss *bss; | |
849 | ||
850 | if (WARN_ON(!pub)) | |
851 | return; | |
852 | ||
853 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
854 | ||
855 | spin_lock_bh(&dev->bss_lock); | |
3207390a | 856 | if (!list_empty(&bss->list)) { |
2b78ac9b | 857 | __cfg80211_unlink_bss(dev, bss); |
3207390a | 858 | dev->bss_generation++; |
3207390a | 859 | } |
d491af19 | 860 | spin_unlock_bh(&dev->bss_lock); |
d491af19 JB |
861 | } |
862 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
863 | ||
3d23e349 | 864 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
865 | int cfg80211_wext_siwscan(struct net_device *dev, |
866 | struct iw_request_info *info, | |
867 | union iwreq_data *wrqu, char *extra) | |
868 | { | |
869 | struct cfg80211_registered_device *rdev; | |
870 | struct wiphy *wiphy; | |
871 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 872 | struct cfg80211_scan_request *creq = NULL; |
2a519311 JB |
873 | int i, err, n_channels = 0; |
874 | enum ieee80211_band band; | |
875 | ||
876 | if (!netif_running(dev)) | |
877 | return -ENETDOWN; | |
878 | ||
b2e3abdc HS |
879 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
880 | wreq = (struct iw_scan_req *)extra; | |
881 | ||
463d0183 | 882 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
883 | |
884 | if (IS_ERR(rdev)) | |
885 | return PTR_ERR(rdev); | |
886 | ||
887 | if (rdev->scan_req) { | |
888 | err = -EBUSY; | |
889 | goto out; | |
890 | } | |
891 | ||
892 | wiphy = &rdev->wiphy; | |
893 | ||
b2e3abdc HS |
894 | /* Determine number of channels, needed to allocate creq */ |
895 | if (wreq && wreq->num_channels) | |
896 | n_channels = wreq->num_channels; | |
897 | else { | |
898 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
899 | if (wiphy->bands[band]) | |
900 | n_channels += wiphy->bands[band]->n_channels; | |
901 | } | |
2a519311 JB |
902 | |
903 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
904 | n_channels * sizeof(void *), | |
905 | GFP_ATOMIC); | |
906 | if (!creq) { | |
907 | err = -ENOMEM; | |
908 | goto out; | |
909 | } | |
910 | ||
911 | creq->wiphy = wiphy; | |
fd014284 | 912 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
913 | /* SSIDs come after channels */ |
914 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
915 | creq->n_channels = n_channels; |
916 | creq->n_ssids = 1; | |
15d6030b | 917 | creq->scan_start = jiffies; |
2a519311 | 918 | |
b2e3abdc | 919 | /* translate "Scan on frequencies" request */ |
2a519311 JB |
920 | i = 0; |
921 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
922 | int j; | |
584991dc | 923 | |
2a519311 JB |
924 | if (!wiphy->bands[band]) |
925 | continue; | |
584991dc | 926 | |
2a519311 | 927 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
928 | /* ignore disabled channels */ |
929 | if (wiphy->bands[band]->channels[j].flags & | |
930 | IEEE80211_CHAN_DISABLED) | |
931 | continue; | |
b2e3abdc HS |
932 | |
933 | /* If we have a wireless request structure and the | |
934 | * wireless request specifies frequencies, then search | |
935 | * for the matching hardware channel. | |
936 | */ | |
937 | if (wreq && wreq->num_channels) { | |
938 | int k; | |
939 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
940 | for (k = 0; k < wreq->num_channels; k++) { | |
a4e7b730 | 941 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
b2e3abdc HS |
942 | if (wext_freq == wiphy_freq) |
943 | goto wext_freq_found; | |
944 | } | |
945 | goto wext_freq_not_found; | |
946 | } | |
947 | ||
948 | wext_freq_found: | |
2a519311 JB |
949 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
950 | i++; | |
b2e3abdc | 951 | wext_freq_not_found: ; |
2a519311 JB |
952 | } |
953 | } | |
8862dc5f HS |
954 | /* No channels found? */ |
955 | if (!i) { | |
956 | err = -EINVAL; | |
957 | goto out; | |
958 | } | |
2a519311 | 959 | |
b2e3abdc HS |
960 | /* Set real number of channels specified in creq->channels[] */ |
961 | creq->n_channels = i; | |
2a519311 | 962 | |
b2e3abdc HS |
963 | /* translate "Scan for SSID" request */ |
964 | if (wreq) { | |
2a519311 | 965 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
966 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
967 | err = -EINVAL; | |
968 | goto out; | |
969 | } | |
2a519311 JB |
970 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
971 | creq->ssids[0].ssid_len = wreq->essid_len; | |
972 | } | |
973 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
974 | creq->n_ssids = 0; | |
975 | } | |
976 | ||
34850ab2 | 977 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
a401d2bb JB |
978 | if (wiphy->bands[i]) |
979 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 980 | |
2a519311 | 981 | rdev->scan_req = creq; |
e35e4d28 | 982 | err = rdev_scan(rdev, creq); |
2a519311 JB |
983 | if (err) { |
984 | rdev->scan_req = NULL; | |
65486c8b | 985 | /* creq will be freed below */ |
463d0183 | 986 | } else { |
fd014284 | 987 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
988 | /* creq now owned by driver */ |
989 | creq = NULL; | |
463d0183 JB |
990 | dev_hold(dev); |
991 | } | |
2a519311 | 992 | out: |
65486c8b | 993 | kfree(creq); |
4d0c8aea | 994 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
995 | return err; |
996 | } | |
ba44cb72 | 997 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
998 | |
999 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
9caf0364 | 1000 | const struct cfg80211_bss_ies *ies, |
2a519311 JB |
1001 | char **current_ev, char *end_buf) |
1002 | { | |
9caf0364 | 1003 | const u8 *pos, *end, *next; |
2a519311 JB |
1004 | struct iw_event iwe; |
1005 | ||
9caf0364 | 1006 | if (!ies) |
2a519311 JB |
1007 | return; |
1008 | ||
1009 | /* | |
1010 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1011 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1012 | */ | |
9caf0364 JB |
1013 | pos = ies->data; |
1014 | end = pos + ies->len; | |
2a519311 JB |
1015 | |
1016 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1017 | next = pos + 2 + pos[1]; | |
1018 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1019 | next = next + 2 + next[1]; | |
1020 | ||
1021 | memset(&iwe, 0, sizeof(iwe)); | |
1022 | iwe.cmd = IWEVGENIE; | |
1023 | iwe.u.data.length = next - pos; | |
1024 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
9caf0364 JB |
1025 | end_buf, &iwe, |
1026 | (void *)pos); | |
2a519311 JB |
1027 | |
1028 | pos = next; | |
1029 | } | |
1030 | ||
1031 | if (end > pos) { | |
1032 | memset(&iwe, 0, sizeof(iwe)); | |
1033 | iwe.cmd = IWEVGENIE; | |
1034 | iwe.u.data.length = end - pos; | |
1035 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
9caf0364 JB |
1036 | end_buf, &iwe, |
1037 | (void *)pos); | |
2a519311 JB |
1038 | } |
1039 | } | |
1040 | ||
cb3a8eec DW |
1041 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
1042 | { | |
1043 | unsigned long end = jiffies; | |
1044 | ||
1045 | if (end >= start) | |
1046 | return jiffies_to_msecs(end - start); | |
1047 | ||
1048 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
1049 | } | |
2a519311 JB |
1050 | |
1051 | static char * | |
77965c97 JB |
1052 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1053 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1054 | char *end_buf) | |
2a519311 | 1055 | { |
9caf0364 | 1056 | const struct cfg80211_bss_ies *ies; |
2a519311 | 1057 | struct iw_event iwe; |
9caf0364 | 1058 | const u8 *ie; |
2a519311 | 1059 | u8 *buf, *cfg, *p; |
9caf0364 | 1060 | int rem, i, sig; |
2a519311 JB |
1061 | bool ismesh = false; |
1062 | ||
1063 | memset(&iwe, 0, sizeof(iwe)); | |
1064 | iwe.cmd = SIOCGIWAP; | |
1065 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1066 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
1067 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1068 | IW_EV_ADDR_LEN); | |
1069 | ||
1070 | memset(&iwe, 0, sizeof(iwe)); | |
1071 | iwe.cmd = SIOCGIWFREQ; | |
1072 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1073 | iwe.u.freq.e = 0; | |
1074 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1075 | IW_EV_FREQ_LEN); | |
1076 | ||
1077 | memset(&iwe, 0, sizeof(iwe)); | |
1078 | iwe.cmd = SIOCGIWFREQ; | |
1079 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1080 | iwe.u.freq.e = 6; | |
1081 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1082 | IW_EV_FREQ_LEN); | |
1083 | ||
77965c97 | 1084 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1085 | memset(&iwe, 0, sizeof(iwe)); |
1086 | iwe.cmd = IWEVQUAL; | |
1087 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1088 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1089 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1090 | switch (wiphy->signal_type) { |
2a519311 | 1091 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1092 | sig = bss->pub.signal / 100; |
1093 | iwe.u.qual.level = sig; | |
2a519311 | 1094 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1095 | if (sig < -110) /* rather bad */ |
1096 | sig = -110; | |
1097 | else if (sig > -40) /* perfect */ | |
1098 | sig = -40; | |
1099 | /* will give a range of 0 .. 70 */ | |
1100 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1101 | break; |
1102 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1103 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1104 | /* will give range 0 .. 100 */ |
1105 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1106 | break; |
1107 | default: | |
1108 | /* not reached */ | |
1109 | break; | |
1110 | } | |
1111 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1112 | &iwe, IW_EV_QUAL_LEN); | |
1113 | } | |
1114 | ||
1115 | memset(&iwe, 0, sizeof(iwe)); | |
1116 | iwe.cmd = SIOCGIWENCODE; | |
1117 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1118 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1119 | else | |
1120 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1121 | iwe.u.data.length = 0; | |
1122 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1123 | &iwe, ""); | |
1124 | ||
9caf0364 JB |
1125 | rcu_read_lock(); |
1126 | ies = rcu_dereference(bss->pub.ies); | |
1127 | if (ies) { | |
1128 | rem = ies->len; | |
1129 | ie = ies->data; | |
1130 | } else { | |
1131 | rem = 0; | |
1132 | ie = NULL; | |
1133 | } | |
1134 | ||
1135 | while (ies && rem >= 2) { | |
2a519311 JB |
1136 | /* invalid data */ |
1137 | if (ie[1] > rem - 2) | |
1138 | break; | |
1139 | ||
1140 | switch (ie[0]) { | |
1141 | case WLAN_EID_SSID: | |
1142 | memset(&iwe, 0, sizeof(iwe)); | |
1143 | iwe.cmd = SIOCGIWESSID; | |
1144 | iwe.u.data.length = ie[1]; | |
1145 | iwe.u.data.flags = 1; | |
1146 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
9caf0364 | 1147 | &iwe, (u8 *)ie + 2); |
2a519311 JB |
1148 | break; |
1149 | case WLAN_EID_MESH_ID: | |
1150 | memset(&iwe, 0, sizeof(iwe)); | |
1151 | iwe.cmd = SIOCGIWESSID; | |
1152 | iwe.u.data.length = ie[1]; | |
1153 | iwe.u.data.flags = 1; | |
1154 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
9caf0364 | 1155 | &iwe, (u8 *)ie + 2); |
2a519311 JB |
1156 | break; |
1157 | case WLAN_EID_MESH_CONFIG: | |
1158 | ismesh = true; | |
136cfa28 | 1159 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
1160 | break; |
1161 | buf = kmalloc(50, GFP_ATOMIC); | |
1162 | if (!buf) | |
1163 | break; | |
9caf0364 | 1164 | cfg = (u8 *)ie + 2; |
2a519311 JB |
1165 | memset(&iwe, 0, sizeof(iwe)); |
1166 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1167 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1168 | "0x%02X", cfg[0]); | |
2a519311 JB |
1169 | iwe.u.data.length = strlen(buf); |
1170 | current_ev = iwe_stream_add_point(info, current_ev, | |
1171 | end_buf, | |
1172 | &iwe, buf); | |
76aa5e70 RP |
1173 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1174 | cfg[1]); | |
2a519311 JB |
1175 | iwe.u.data.length = strlen(buf); |
1176 | current_ev = iwe_stream_add_point(info, current_ev, | |
1177 | end_buf, | |
1178 | &iwe, buf); | |
76aa5e70 RP |
1179 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1180 | cfg[2]); | |
2a519311 JB |
1181 | iwe.u.data.length = strlen(buf); |
1182 | current_ev = iwe_stream_add_point(info, current_ev, | |
1183 | end_buf, | |
1184 | &iwe, buf); | |
76aa5e70 | 1185 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 JB |
1186 | iwe.u.data.length = strlen(buf); |
1187 | current_ev = iwe_stream_add_point(info, current_ev, | |
1188 | end_buf, | |
1189 | &iwe, buf); | |
76aa5e70 RP |
1190 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1191 | iwe.u.data.length = strlen(buf); | |
1192 | current_ev = iwe_stream_add_point(info, current_ev, | |
1193 | end_buf, | |
1194 | &iwe, buf); | |
1195 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); | |
1196 | iwe.u.data.length = strlen(buf); | |
1197 | current_ev = iwe_stream_add_point(info, current_ev, | |
1198 | end_buf, | |
1199 | &iwe, buf); | |
1200 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); | |
2a519311 JB |
1201 | iwe.u.data.length = strlen(buf); |
1202 | current_ev = iwe_stream_add_point(info, current_ev, | |
1203 | end_buf, | |
1204 | &iwe, buf); | |
1205 | kfree(buf); | |
1206 | break; | |
1207 | case WLAN_EID_SUPP_RATES: | |
1208 | case WLAN_EID_EXT_SUPP_RATES: | |
1209 | /* display all supported rates in readable format */ | |
1210 | p = current_ev + iwe_stream_lcp_len(info); | |
1211 | ||
1212 | memset(&iwe, 0, sizeof(iwe)); | |
1213 | iwe.cmd = SIOCGIWRATE; | |
1214 | /* Those two flags are ignored... */ | |
1215 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1216 | ||
1217 | for (i = 0; i < ie[1]; i++) { | |
1218 | iwe.u.bitrate.value = | |
1219 | ((ie[i + 2] & 0x7f) * 500000); | |
1220 | p = iwe_stream_add_value(info, current_ev, p, | |
1221 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
1222 | } | |
1223 | current_ev = p; | |
1224 | break; | |
1225 | } | |
1226 | rem -= ie[1] + 2; | |
1227 | ie += ie[1] + 2; | |
1228 | } | |
1229 | ||
f64f9e71 JP |
1230 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1231 | ismesh) { | |
2a519311 JB |
1232 | memset(&iwe, 0, sizeof(iwe)); |
1233 | iwe.cmd = SIOCGIWMODE; | |
1234 | if (ismesh) | |
1235 | iwe.u.mode = IW_MODE_MESH; | |
1236 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1237 | iwe.u.mode = IW_MODE_MASTER; | |
1238 | else | |
1239 | iwe.u.mode = IW_MODE_ADHOC; | |
1240 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1241 | &iwe, IW_EV_UINT_LEN); | |
1242 | } | |
1243 | ||
1244 | buf = kmalloc(30, GFP_ATOMIC); | |
1245 | if (buf) { | |
1246 | memset(&iwe, 0, sizeof(iwe)); | |
1247 | iwe.cmd = IWEVCUSTOM; | |
1248 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
1249 | iwe.u.data.length = strlen(buf); | |
1250 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1251 | &iwe, buf); | |
1252 | memset(&iwe, 0, sizeof(iwe)); | |
1253 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
1254 | sprintf(buf, " Last beacon: %ums ago", |
1255 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
1256 | iwe.u.data.length = strlen(buf); |
1257 | current_ev = iwe_stream_add_point(info, current_ev, | |
1258 | end_buf, &iwe, buf); | |
1259 | kfree(buf); | |
1260 | } | |
1261 | ||
9caf0364 JB |
1262 | ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf); |
1263 | rcu_read_unlock(); | |
2a519311 JB |
1264 | |
1265 | return current_ev; | |
1266 | } | |
1267 | ||
1268 | ||
1269 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
1270 | struct iw_request_info *info, | |
1271 | char *buf, size_t len) | |
1272 | { | |
1273 | char *current_ev = buf; | |
1274 | char *end_buf = buf + len; | |
1275 | struct cfg80211_internal_bss *bss; | |
1276 | ||
1277 | spin_lock_bh(&dev->bss_lock); | |
1278 | cfg80211_bss_expire(dev); | |
1279 | ||
1280 | list_for_each_entry(bss, &dev->bss_list, list) { | |
1281 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
1282 | spin_unlock_bh(&dev->bss_lock); | |
1283 | return -E2BIG; | |
1284 | } | |
77965c97 JB |
1285 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
1286 | current_ev, end_buf); | |
2a519311 JB |
1287 | } |
1288 | spin_unlock_bh(&dev->bss_lock); | |
1289 | return current_ev - buf; | |
1290 | } | |
1291 | ||
1292 | ||
1293 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1294 | struct iw_request_info *info, | |
1295 | struct iw_point *data, char *extra) | |
1296 | { | |
1297 | struct cfg80211_registered_device *rdev; | |
1298 | int res; | |
1299 | ||
1300 | if (!netif_running(dev)) | |
1301 | return -ENETDOWN; | |
1302 | ||
463d0183 | 1303 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1304 | |
1305 | if (IS_ERR(rdev)) | |
1306 | return PTR_ERR(rdev); | |
1307 | ||
1308 | if (rdev->scan_req) { | |
1309 | res = -EAGAIN; | |
1310 | goto out; | |
1311 | } | |
1312 | ||
1313 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1314 | data->length = 0; | |
1315 | if (res >= 0) { | |
1316 | data->length = res; | |
1317 | res = 0; | |
1318 | } | |
1319 | ||
1320 | out: | |
4d0c8aea | 1321 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1322 | return res; |
1323 | } | |
ba44cb72 | 1324 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 1325 | #endif |