Commit | Line | Data |
---|---|---|
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 | { | |
26 | struct cfg80211_internal_bss *bss; | |
27 | ||
28 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
b629ea3d JB |
29 | |
30 | if (WARN_ON(atomic_read(&bss->hold))) | |
31 | return; | |
32 | ||
e8e27c66 AK |
33 | if (bss->pub.free_priv) |
34 | bss->pub.free_priv(&bss->pub); | |
35 | ||
36 | if (bss->beacon_ies_allocated) | |
37 | kfree(bss->pub.beacon_ies); | |
38 | if (bss->proberesp_ies_allocated) | |
39 | kfree(bss->pub.proberesp_ies); | |
40 | ||
e8e27c66 AK |
41 | kfree(bss); |
42 | } | |
43 | ||
44 | /* must hold dev->bss_lock! */ | |
45 | static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, | |
46 | struct cfg80211_internal_bss *bss) | |
47 | { | |
48 | list_del_init(&bss->list); | |
49 | rb_erase(&bss->rbn, &dev->bss_tree); | |
50 | kref_put(&bss->ref, bss_release); | |
51 | } | |
52 | ||
15d6030b SL |
53 | /* must hold dev->bss_lock! */ |
54 | static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev, | |
55 | unsigned long expire_time) | |
56 | { | |
57 | struct cfg80211_internal_bss *bss, *tmp; | |
58 | bool expired = false; | |
59 | ||
60 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
61 | if (atomic_read(&bss->hold)) | |
62 | continue; | |
63 | if (!time_after(expire_time, bss->ts)) | |
64 | continue; | |
65 | ||
66 | __cfg80211_unlink_bss(dev, bss); | |
67 | expired = true; | |
68 | } | |
69 | ||
70 | if (expired) | |
71 | dev->bss_generation++; | |
72 | } | |
73 | ||
01a0ac41 | 74 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) |
2a519311 | 75 | { |
667503dd | 76 | struct cfg80211_scan_request *request; |
fd014284 | 77 | struct wireless_dev *wdev; |
3d23e349 | 78 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
79 | union iwreq_data wrqu; |
80 | #endif | |
81 | ||
01a0ac41 JB |
82 | ASSERT_RDEV_LOCK(rdev); |
83 | ||
667503dd JB |
84 | request = rdev->scan_req; |
85 | ||
01a0ac41 JB |
86 | if (!request) |
87 | return; | |
88 | ||
fd014284 | 89 | wdev = request->wdev; |
2a519311 | 90 | |
6829c878 JB |
91 | /* |
92 | * This must be before sending the other events! | |
93 | * Otherwise, wpa_supplicant gets completely confused with | |
94 | * wext events. | |
95 | */ | |
fd014284 JB |
96 | if (wdev->netdev) |
97 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 98 | |
15d6030b | 99 | if (request->aborted) { |
fd014284 | 100 | nl80211_send_scan_aborted(rdev, wdev); |
15d6030b SL |
101 | } else { |
102 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
103 | /* flush entries from previous scans */ | |
104 | spin_lock_bh(&rdev->bss_lock); | |
105 | __cfg80211_bss_expire(rdev, request->scan_start); | |
106 | spin_unlock_bh(&rdev->bss_lock); | |
107 | } | |
fd014284 | 108 | nl80211_send_scan_done(rdev, wdev); |
15d6030b | 109 | } |
2a519311 | 110 | |
3d23e349 | 111 | #ifdef CONFIG_CFG80211_WEXT |
fd014284 | 112 | if (wdev->netdev && !request->aborted) { |
2a519311 JB |
113 | memset(&wrqu, 0, sizeof(wrqu)); |
114 | ||
fd014284 | 115 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
116 | } |
117 | #endif | |
118 | ||
fd014284 JB |
119 | if (wdev->netdev) |
120 | dev_put(wdev->netdev); | |
2a519311 | 121 | |
36e6fea8 | 122 | rdev->scan_req = NULL; |
01a0ac41 JB |
123 | |
124 | /* | |
125 | * OK. If this is invoked with "leak" then we can't | |
126 | * free this ... but we've cleaned it up anyway. The | |
127 | * driver failed to call the scan_done callback, so | |
128 | * all bets are off, it might still be trying to use | |
129 | * the scan request or not ... if it accesses the dev | |
130 | * in there (it shouldn't anyway) then it may crash. | |
131 | */ | |
132 | if (!leak) | |
133 | kfree(request); | |
2a519311 | 134 | } |
667503dd | 135 | |
36e6fea8 JB |
136 | void __cfg80211_scan_done(struct work_struct *wk) |
137 | { | |
138 | struct cfg80211_registered_device *rdev; | |
139 | ||
140 | rdev = container_of(wk, struct cfg80211_registered_device, | |
141 | scan_done_wk); | |
142 | ||
143 | cfg80211_lock_rdev(rdev); | |
01a0ac41 | 144 | ___cfg80211_scan_done(rdev, false); |
36e6fea8 JB |
145 | cfg80211_unlock_rdev(rdev); |
146 | } | |
147 | ||
667503dd JB |
148 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
149 | { | |
4ee3e063 | 150 | trace_cfg80211_scan_done(request, aborted); |
667503dd JB |
151 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
152 | ||
153 | request->aborted = aborted; | |
e60d7443 | 154 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
667503dd | 155 | } |
2a519311 JB |
156 | EXPORT_SYMBOL(cfg80211_scan_done); |
157 | ||
807f8a8c LC |
158 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
159 | { | |
160 | struct cfg80211_registered_device *rdev; | |
15d6030b | 161 | struct cfg80211_sched_scan_request *request; |
807f8a8c LC |
162 | |
163 | rdev = container_of(wk, struct cfg80211_registered_device, | |
164 | sched_scan_results_wk); | |
165 | ||
15d6030b SL |
166 | request = rdev->sched_scan_req; |
167 | ||
c10841ca | 168 | mutex_lock(&rdev->sched_scan_mtx); |
807f8a8c LC |
169 | |
170 | /* we don't have sched_scan_req anymore if the scan is stopping */ | |
15d6030b SL |
171 | if (request) { |
172 | if (request->flags & NL80211_SCAN_FLAG_FLUSH) { | |
173 | /* flush entries from previous scans */ | |
174 | spin_lock_bh(&rdev->bss_lock); | |
175 | __cfg80211_bss_expire(rdev, request->scan_start); | |
176 | spin_unlock_bh(&rdev->bss_lock); | |
177 | request->scan_start = | |
178 | jiffies + msecs_to_jiffies(request->interval); | |
179 | } | |
180 | nl80211_send_sched_scan_results(rdev, request->dev); | |
181 | } | |
807f8a8c | 182 | |
c10841ca | 183 | mutex_unlock(&rdev->sched_scan_mtx); |
807f8a8c LC |
184 | } |
185 | ||
186 | void cfg80211_sched_scan_results(struct wiphy *wiphy) | |
187 | { | |
4ee3e063 | 188 | trace_cfg80211_sched_scan_results(wiphy); |
807f8a8c LC |
189 | /* ignore if we're not scanning */ |
190 | if (wiphy_to_dev(wiphy)->sched_scan_req) | |
191 | queue_work(cfg80211_wq, | |
192 | &wiphy_to_dev(wiphy)->sched_scan_results_wk); | |
193 | } | |
194 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
195 | ||
85a9994a | 196 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) |
807f8a8c | 197 | { |
85a9994a | 198 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
807f8a8c | 199 | |
4ee3e063 BL |
200 | trace_cfg80211_sched_scan_stopped(wiphy); |
201 | ||
c10841ca | 202 | mutex_lock(&rdev->sched_scan_mtx); |
807f8a8c | 203 | __cfg80211_stop_sched_scan(rdev, true); |
c10841ca | 204 | mutex_unlock(&rdev->sched_scan_mtx); |
807f8a8c | 205 | } |
807f8a8c LC |
206 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
207 | ||
208 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, | |
209 | bool driver_initiated) | |
210 | { | |
807f8a8c LC |
211 | struct net_device *dev; |
212 | ||
c10841ca | 213 | lockdep_assert_held(&rdev->sched_scan_mtx); |
807f8a8c LC |
214 | |
215 | if (!rdev->sched_scan_req) | |
1a84ff75 | 216 | return -ENOENT; |
807f8a8c LC |
217 | |
218 | dev = rdev->sched_scan_req->dev; | |
219 | ||
85a9994a | 220 | if (!driver_initiated) { |
e35e4d28 | 221 | int err = rdev_sched_scan_stop(rdev, dev); |
85a9994a LC |
222 | if (err) |
223 | return err; | |
224 | } | |
807f8a8c LC |
225 | |
226 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); | |
227 | ||
228 | kfree(rdev->sched_scan_req); | |
229 | rdev->sched_scan_req = NULL; | |
230 | ||
3b4670ff | 231 | return 0; |
807f8a8c LC |
232 | } |
233 | ||
cb3a8eec DW |
234 | /* must hold dev->bss_lock! */ |
235 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
236 | unsigned long age_secs) | |
237 | { | |
238 | struct cfg80211_internal_bss *bss; | |
239 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
240 | ||
915de2ff | 241 | list_for_each_entry(bss, &dev->bss_list, list) |
cb3a8eec | 242 | bss->ts -= age_jiffies; |
cb3a8eec DW |
243 | } |
244 | ||
2a519311 JB |
245 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) |
246 | { | |
15d6030b | 247 | __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); |
2a519311 JB |
248 | } |
249 | ||
c21dbf92 | 250 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
2a519311 | 251 | { |
c21dbf92 | 252 | while (len > 2 && ies[0] != eid) { |
2a519311 JB |
253 | len -= ies[1] + 2; |
254 | ies += ies[1] + 2; | |
255 | } | |
256 | if (len < 2) | |
257 | return NULL; | |
258 | if (len < 2 + ies[1]) | |
259 | return NULL; | |
260 | return ies; | |
261 | } | |
c21dbf92 | 262 | EXPORT_SYMBOL(cfg80211_find_ie); |
2a519311 | 263 | |
0c28ec58 EP |
264 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, |
265 | const u8 *ies, int len) | |
266 | { | |
267 | struct ieee80211_vendor_ie *ie; | |
268 | const u8 *pos = ies, *end = ies + len; | |
269 | int ie_oui; | |
270 | ||
271 | while (pos < end) { | |
272 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, | |
273 | end - pos); | |
274 | if (!pos) | |
275 | return NULL; | |
276 | ||
277 | if (end - pos < sizeof(*ie)) | |
278 | return NULL; | |
279 | ||
280 | ie = (struct ieee80211_vendor_ie *)pos; | |
281 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; | |
282 | if (ie_oui == oui && ie->oui_type == oui_type) | |
283 | return pos; | |
284 | ||
285 | pos += 2 + ie->len; | |
286 | } | |
287 | return NULL; | |
288 | } | |
289 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
290 | ||
2a519311 JB |
291 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) |
292 | { | |
c21dbf92 JB |
293 | const u8 *ie1 = cfg80211_find_ie(num, ies1, len1); |
294 | const u8 *ie2 = cfg80211_find_ie(num, ies2, len2); | |
2a519311 | 295 | |
3b6ef633 | 296 | /* equal if both missing */ |
2a519311 JB |
297 | if (!ie1 && !ie2) |
298 | return 0; | |
3b6ef633 JB |
299 | /* sort missing IE before (left of) present IE */ |
300 | if (!ie1) | |
2a519311 | 301 | return -1; |
3b6ef633 JB |
302 | if (!ie2) |
303 | return 1; | |
2a519311 | 304 | |
3b6ef633 JB |
305 | /* sort by length first, then by contents */ |
306 | if (ie1[1] != ie2[1]) | |
2a519311 | 307 | return ie2[1] - ie1[1]; |
3b6ef633 | 308 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
2a519311 JB |
309 | } |
310 | ||
915de2ff | 311 | static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, |
2a519311 JB |
312 | const u8 *ssid, size_t ssid_len) |
313 | { | |
314 | const u8 *ssidie; | |
315 | ||
ac422d3c | 316 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
317 | return false; |
318 | ||
79420f09 JB |
319 | if (!ssid) |
320 | return true; | |
321 | ||
c21dbf92 JB |
322 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, |
323 | a->information_elements, | |
324 | a->len_information_elements); | |
2a519311 JB |
325 | if (!ssidie) |
326 | return false; | |
327 | if (ssidie[1] != ssid_len) | |
328 | return false; | |
329 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
330 | } | |
331 | ||
333ba732 EP |
332 | static bool is_mesh_bss(struct cfg80211_bss *a) |
333 | { | |
334 | const u8 *ie; | |
335 | ||
336 | if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) | |
337 | return false; | |
338 | ||
339 | ie = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
340 | a->information_elements, | |
341 | a->len_information_elements); | |
342 | if (!ie) | |
343 | return false; | |
344 | ||
345 | ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
346 | a->information_elements, | |
347 | a->len_information_elements); | |
348 | if (!ie) | |
349 | return false; | |
350 | ||
351 | return true; | |
352 | } | |
353 | ||
2a519311 JB |
354 | static bool is_mesh(struct cfg80211_bss *a, |
355 | const u8 *meshid, size_t meshidlen, | |
356 | const u8 *meshcfg) | |
357 | { | |
358 | const u8 *ie; | |
359 | ||
333ba732 | 360 | if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
2a519311 JB |
361 | return false; |
362 | ||
c21dbf92 JB |
363 | ie = cfg80211_find_ie(WLAN_EID_MESH_ID, |
364 | a->information_elements, | |
365 | a->len_information_elements); | |
2a519311 JB |
366 | if (!ie) |
367 | return false; | |
368 | if (ie[1] != meshidlen) | |
369 | return false; | |
370 | if (memcmp(ie + 2, meshid, meshidlen)) | |
371 | return false; | |
372 | ||
c21dbf92 JB |
373 | ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
374 | a->information_elements, | |
375 | a->len_information_elements); | |
cd3468ba JB |
376 | if (!ie) |
377 | return false; | |
136cfa28 | 378 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
379 | return false; |
380 | ||
381 | /* | |
382 | * Ignore mesh capability (last two bytes of the IE) when | |
383 | * comparing since that may differ between stations taking | |
384 | * part in the same mesh. | |
385 | */ | |
136cfa28 | 386 | return memcmp(ie + 2, meshcfg, |
915de2ff | 387 | sizeof(struct ieee80211_meshconf_ie) - 2) == 0; |
2a519311 JB |
388 | } |
389 | ||
915de2ff | 390 | static int cmp_bss_core(struct cfg80211_bss *a, struct cfg80211_bss *b) |
2a519311 JB |
391 | { |
392 | int r; | |
393 | ||
394 | if (a->channel != b->channel) | |
395 | return b->channel->center_freq - a->channel->center_freq; | |
396 | ||
333ba732 | 397 | if (is_mesh_bss(a) && is_mesh_bss(b)) { |
2a519311 JB |
398 | r = cmp_ies(WLAN_EID_MESH_ID, |
399 | a->information_elements, | |
400 | a->len_information_elements, | |
401 | b->information_elements, | |
402 | b->len_information_elements); | |
403 | if (r) | |
404 | return r; | |
405 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
406 | a->information_elements, | |
407 | a->len_information_elements, | |
408 | b->information_elements, | |
409 | b->len_information_elements); | |
410 | } | |
411 | ||
ef9456a8 EG |
412 | /* |
413 | * we can't use compare_ether_addr here since we need a < > operator. | |
414 | * The binary return value of compare_ether_addr isn't enough | |
415 | */ | |
416 | return memcmp(a->bssid, b->bssid, sizeof(a->bssid)); | |
dd9dfb9f DT |
417 | } |
418 | ||
419 | static int cmp_bss(struct cfg80211_bss *a, | |
420 | struct cfg80211_bss *b) | |
421 | { | |
422 | int r; | |
423 | ||
424 | r = cmp_bss_core(a, b); | |
0a35d36d JC |
425 | if (r) |
426 | return r; | |
427 | ||
2a519311 JB |
428 | return cmp_ies(WLAN_EID_SSID, |
429 | a->information_elements, | |
430 | a->len_information_elements, | |
431 | b->information_elements, | |
432 | b->len_information_elements); | |
433 | } | |
434 | ||
915de2ff | 435 | static int cmp_hidden_bss(struct cfg80211_bss *a, struct cfg80211_bss *b) |
dd9dfb9f DT |
436 | { |
437 | const u8 *ie1; | |
438 | const u8 *ie2; | |
439 | int i; | |
440 | int r; | |
441 | ||
442 | r = cmp_bss_core(a, b); | |
443 | if (r) | |
444 | return r; | |
445 | ||
446 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, | |
915de2ff JB |
447 | a->information_elements, |
448 | a->len_information_elements); | |
dd9dfb9f | 449 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, |
915de2ff JB |
450 | b->information_elements, |
451 | b->len_information_elements); | |
dd9dfb9f | 452 | |
f94f8b16 JB |
453 | /* |
454 | * Key comparator must use same algorithm in any rb-tree | |
dd9dfb9f DT |
455 | * search function (order is important), otherwise ordering |
456 | * of items in the tree is broken and search gives incorrect | |
f94f8b16 JB |
457 | * results. This code uses same order as cmp_ies() does. |
458 | * | |
459 | * Note that due to the differring behaviour with hidden SSIDs | |
460 | * this function only works when "b" is the tree element and | |
461 | * "a" is the key we're looking for. | |
462 | */ | |
dd9dfb9f DT |
463 | |
464 | /* sort missing IE before (left of) present IE */ | |
465 | if (!ie1) | |
466 | return -1; | |
467 | if (!ie2) | |
468 | return 1; | |
469 | ||
470 | /* zero-size SSID is used as an indication of the hidden bss */ | |
471 | if (!ie2[1]) | |
472 | return 0; | |
473 | ||
474 | /* sort by length first, then by contents */ | |
475 | if (ie1[1] != ie2[1]) | |
476 | return ie2[1] - ie1[1]; | |
477 | ||
f94f8b16 JB |
478 | /* |
479 | * zeroed SSID ie is another indication of a hidden bss; | |
480 | * if it isn't zeroed just return the regular sort value | |
481 | * to find the next candidate | |
482 | */ | |
dd9dfb9f DT |
483 | for (i = 0; i < ie2[1]; i++) |
484 | if (ie2[i + 2]) | |
f94f8b16 | 485 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
dd9dfb9f DT |
486 | |
487 | return 0; | |
488 | } | |
489 | ||
2a519311 JB |
490 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
491 | struct ieee80211_channel *channel, | |
492 | const u8 *bssid, | |
79420f09 JB |
493 | const u8 *ssid, size_t ssid_len, |
494 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
495 | { |
496 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
497 | struct cfg80211_internal_bss *bss, *res = NULL; | |
ccb6c136 | 498 | unsigned long now = jiffies; |
2a519311 | 499 | |
4ee3e063 BL |
500 | trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask, |
501 | capa_val); | |
502 | ||
2a519311 JB |
503 | spin_lock_bh(&dev->bss_lock); |
504 | ||
505 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
506 | if ((bss->pub.capability & capa_mask) != capa_val) |
507 | continue; | |
2a519311 JB |
508 | if (channel && bss->pub.channel != channel) |
509 | continue; | |
ccb6c136 JB |
510 | /* Don't get expired BSS structs */ |
511 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
512 | !atomic_read(&bss->hold)) | |
513 | continue; | |
2a519311 JB |
514 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
515 | res = bss; | |
516 | kref_get(&res->ref); | |
517 | break; | |
518 | } | |
519 | } | |
520 | ||
521 | spin_unlock_bh(&dev->bss_lock); | |
522 | if (!res) | |
523 | return NULL; | |
4ee3e063 | 524 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
525 | return &res->pub; |
526 | } | |
527 | EXPORT_SYMBOL(cfg80211_get_bss); | |
528 | ||
529 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
530 | struct ieee80211_channel *channel, | |
531 | const u8 *meshid, size_t meshidlen, | |
532 | const u8 *meshcfg) | |
533 | { | |
534 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
535 | struct cfg80211_internal_bss *bss, *res = NULL; | |
536 | ||
537 | spin_lock_bh(&dev->bss_lock); | |
538 | ||
539 | list_for_each_entry(bss, &dev->bss_list, list) { | |
540 | if (channel && bss->pub.channel != channel) | |
541 | continue; | |
542 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
543 | res = bss; | |
544 | kref_get(&res->ref); | |
545 | break; | |
546 | } | |
547 | } | |
548 | ||
549 | spin_unlock_bh(&dev->bss_lock); | |
550 | if (!res) | |
551 | return NULL; | |
552 | return &res->pub; | |
553 | } | |
554 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
555 | ||
556 | ||
557 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
558 | struct cfg80211_internal_bss *bss) | |
559 | { | |
560 | struct rb_node **p = &dev->bss_tree.rb_node; | |
561 | struct rb_node *parent = NULL; | |
562 | struct cfg80211_internal_bss *tbss; | |
563 | int cmp; | |
564 | ||
565 | while (*p) { | |
566 | parent = *p; | |
567 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
568 | ||
569 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
570 | ||
571 | if (WARN_ON(!cmp)) { | |
572 | /* will sort of leak this BSS */ | |
573 | return; | |
574 | } | |
575 | ||
576 | if (cmp < 0) | |
577 | p = &(*p)->rb_left; | |
578 | else | |
579 | p = &(*p)->rb_right; | |
580 | } | |
581 | ||
582 | rb_link_node(&bss->rbn, parent, p); | |
583 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
584 | } | |
585 | ||
586 | static struct cfg80211_internal_bss * | |
587 | rb_find_bss(struct cfg80211_registered_device *dev, | |
588 | struct cfg80211_internal_bss *res) | |
589 | { | |
590 | struct rb_node *n = dev->bss_tree.rb_node; | |
591 | struct cfg80211_internal_bss *bss; | |
592 | int r; | |
593 | ||
594 | while (n) { | |
595 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
596 | r = cmp_bss(&res->pub, &bss->pub); | |
597 | ||
598 | if (r == 0) | |
599 | return bss; | |
600 | else if (r < 0) | |
601 | n = n->rb_left; | |
602 | else | |
603 | n = n->rb_right; | |
604 | } | |
605 | ||
606 | return NULL; | |
607 | } | |
608 | ||
dd9dfb9f DT |
609 | static struct cfg80211_internal_bss * |
610 | rb_find_hidden_bss(struct cfg80211_registered_device *dev, | |
915de2ff | 611 | struct cfg80211_internal_bss *res) |
dd9dfb9f DT |
612 | { |
613 | struct rb_node *n = dev->bss_tree.rb_node; | |
614 | struct cfg80211_internal_bss *bss; | |
615 | int r; | |
616 | ||
617 | while (n) { | |
618 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
619 | r = cmp_hidden_bss(&res->pub, &bss->pub); | |
620 | ||
621 | if (r == 0) | |
622 | return bss; | |
623 | else if (r < 0) | |
624 | n = n->rb_left; | |
625 | else | |
626 | n = n->rb_right; | |
627 | } | |
628 | ||
629 | return NULL; | |
630 | } | |
631 | ||
632 | static void | |
633 | copy_hidden_ies(struct cfg80211_internal_bss *res, | |
915de2ff | 634 | struct cfg80211_internal_bss *hidden) |
dd9dfb9f DT |
635 | { |
636 | if (unlikely(res->pub.beacon_ies)) | |
637 | return; | |
638 | if (WARN_ON(!hidden->pub.beacon_ies)) | |
639 | return; | |
640 | ||
641 | res->pub.beacon_ies = kmalloc(hidden->pub.len_beacon_ies, GFP_ATOMIC); | |
642 | if (unlikely(!res->pub.beacon_ies)) | |
643 | return; | |
644 | ||
645 | res->beacon_ies_allocated = true; | |
646 | res->pub.len_beacon_ies = hidden->pub.len_beacon_ies; | |
647 | memcpy(res->pub.beacon_ies, hidden->pub.beacon_ies, | |
915de2ff | 648 | res->pub.len_beacon_ies); |
dd9dfb9f DT |
649 | } |
650 | ||
2a519311 JB |
651 | static struct cfg80211_internal_bss * |
652 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
34a6eddb | 653 | struct cfg80211_internal_bss *res) |
2a519311 JB |
654 | { |
655 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 JB |
656 | |
657 | /* | |
658 | * The reference to "res" is donated to this function. | |
659 | */ | |
660 | ||
661 | if (WARN_ON(!res->pub.channel)) { | |
662 | kref_put(&res->ref, bss_release); | |
663 | return NULL; | |
664 | } | |
665 | ||
666 | res->ts = jiffies; | |
667 | ||
2a519311 JB |
668 | spin_lock_bh(&dev->bss_lock); |
669 | ||
670 | found = rb_find_bss(dev, res); | |
671 | ||
cd1658f5 | 672 | if (found) { |
2a519311 JB |
673 | found->pub.beacon_interval = res->pub.beacon_interval; |
674 | found->pub.tsf = res->pub.tsf; | |
675 | found->pub.signal = res->pub.signal; | |
2a519311 JB |
676 | found->pub.capability = res->pub.capability; |
677 | found->ts = res->ts; | |
cd1658f5 | 678 | |
34a6eddb JM |
679 | /* Update IEs */ |
680 | if (res->pub.proberesp_ies) { | |
cd1658f5 | 681 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); |
34a6eddb JM |
682 | size_t ielen = res->pub.len_proberesp_ies; |
683 | ||
684 | if (found->pub.proberesp_ies && | |
685 | !found->proberesp_ies_allocated && | |
686 | ksize(found) >= used + ielen) { | |
687 | memcpy(found->pub.proberesp_ies, | |
688 | res->pub.proberesp_ies, ielen); | |
689 | found->pub.len_proberesp_ies = ielen; | |
690 | } else { | |
691 | u8 *ies = found->pub.proberesp_ies; | |
692 | ||
693 | if (found->proberesp_ies_allocated) | |
694 | ies = krealloc(ies, ielen, GFP_ATOMIC); | |
695 | else | |
696 | ies = kmalloc(ielen, GFP_ATOMIC); | |
697 | ||
698 | if (ies) { | |
699 | memcpy(ies, res->pub.proberesp_ies, | |
700 | ielen); | |
701 | found->proberesp_ies_allocated = true; | |
702 | found->pub.proberesp_ies = ies; | |
703 | found->pub.len_proberesp_ies = ielen; | |
704 | } | |
705 | } | |
cd1658f5 | 706 | |
34a6eddb JM |
707 | /* Override possible earlier Beacon frame IEs */ |
708 | found->pub.information_elements = | |
709 | found->pub.proberesp_ies; | |
710 | found->pub.len_information_elements = | |
711 | found->pub.len_proberesp_ies; | |
712 | } | |
915de2ff | 713 | |
34a6eddb JM |
714 | if (res->pub.beacon_ies) { |
715 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); | |
716 | size_t ielen = res->pub.len_beacon_ies; | |
01123e23 SN |
717 | bool information_elements_is_beacon_ies = |
718 | (found->pub.information_elements == | |
719 | found->pub.beacon_ies); | |
34a6eddb JM |
720 | |
721 | if (found->pub.beacon_ies && | |
722 | !found->beacon_ies_allocated && | |
723 | ksize(found) >= used + ielen) { | |
724 | memcpy(found->pub.beacon_ies, | |
725 | res->pub.beacon_ies, ielen); | |
726 | found->pub.len_beacon_ies = ielen; | |
cd1658f5 | 727 | } else { |
34a6eddb | 728 | u8 *ies = found->pub.beacon_ies; |
cd1658f5 | 729 | |
34a6eddb | 730 | if (found->beacon_ies_allocated) |
273de92c MB |
731 | ies = krealloc(ies, ielen, GFP_ATOMIC); |
732 | else | |
cd1658f5 JB |
733 | ies = kmalloc(ielen, GFP_ATOMIC); |
734 | ||
735 | if (ies) { | |
34a6eddb JM |
736 | memcpy(ies, res->pub.beacon_ies, |
737 | ielen); | |
738 | found->beacon_ies_allocated = true; | |
739 | found->pub.beacon_ies = ies; | |
740 | found->pub.len_beacon_ies = ielen; | |
cd1658f5 JB |
741 | } |
742 | } | |
01123e23 SN |
743 | |
744 | /* Override IEs if they were from a beacon before */ | |
745 | if (information_elements_is_beacon_ies) { | |
746 | found->pub.information_elements = | |
747 | found->pub.beacon_ies; | |
748 | found->pub.len_information_elements = | |
749 | found->pub.len_beacon_ies; | |
750 | } | |
cd1658f5 JB |
751 | } |
752 | ||
2a519311 JB |
753 | kref_put(&res->ref, bss_release); |
754 | } else { | |
dd9dfb9f DT |
755 | struct cfg80211_internal_bss *hidden; |
756 | ||
757 | /* First check if the beacon is a probe response from | |
758 | * a hidden bss. If so, copy beacon ies (with nullified | |
759 | * ssid) into the probe response bss entry (with real ssid). | |
760 | * It is required basically for PSM implementation | |
761 | * (probe responses do not contain tim ie) */ | |
762 | ||
763 | /* TODO: The code is not trying to update existing probe | |
764 | * response bss entries when beacon ies are | |
765 | * getting changed. */ | |
766 | hidden = rb_find_hidden_bss(dev, res); | |
767 | if (hidden) | |
768 | copy_hidden_ies(res, hidden); | |
769 | ||
2a519311 JB |
770 | /* this "consumes" the reference */ |
771 | list_add_tail(&res->list, &dev->bss_list); | |
772 | rb_insert_bss(dev, res); | |
773 | found = res; | |
774 | } | |
775 | ||
776 | dev->bss_generation++; | |
777 | spin_unlock_bh(&dev->bss_lock); | |
778 | ||
779 | kref_get(&found->ref); | |
780 | return found; | |
781 | } | |
782 | ||
0172bb75 JB |
783 | static struct ieee80211_channel * |
784 | cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, | |
785 | struct ieee80211_channel *channel) | |
786 | { | |
787 | const u8 *tmp; | |
788 | u32 freq; | |
789 | int channel_number = -1; | |
790 | ||
791 | tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen); | |
792 | if (tmp && tmp[1] == 1) { | |
793 | channel_number = tmp[2]; | |
794 | } else { | |
795 | tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen); | |
796 | if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) { | |
797 | struct ieee80211_ht_operation *htop = (void *)(tmp + 2); | |
798 | ||
799 | channel_number = htop->primary_chan; | |
800 | } | |
801 | } | |
802 | ||
803 | if (channel_number < 0) | |
804 | return channel; | |
805 | ||
806 | freq = ieee80211_channel_to_frequency(channel_number, channel->band); | |
807 | channel = ieee80211_get_channel(wiphy, freq); | |
808 | if (!channel) | |
809 | return NULL; | |
810 | if (channel->flags & IEEE80211_CHAN_DISABLED) | |
811 | return NULL; | |
812 | return channel; | |
813 | } | |
814 | ||
06aa7afa JK |
815 | struct cfg80211_bss* |
816 | cfg80211_inform_bss(struct wiphy *wiphy, | |
817 | struct ieee80211_channel *channel, | |
7b8bcff2 JB |
818 | const u8 *bssid, u64 tsf, u16 capability, |
819 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
06aa7afa JK |
820 | s32 signal, gfp_t gfp) |
821 | { | |
822 | struct cfg80211_internal_bss *res; | |
823 | size_t privsz; | |
824 | ||
825 | if (WARN_ON(!wiphy)) | |
826 | return NULL; | |
827 | ||
828 | privsz = wiphy->bss_priv_size; | |
829 | ||
22fe88d3 | 830 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
06aa7afa JK |
831 | (signal < 0 || signal > 100))) |
832 | return NULL; | |
833 | ||
0172bb75 JB |
834 | channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel); |
835 | if (!channel) | |
836 | return NULL; | |
837 | ||
06aa7afa JK |
838 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); |
839 | if (!res) | |
840 | return NULL; | |
841 | ||
842 | memcpy(res->pub.bssid, bssid, ETH_ALEN); | |
843 | res->pub.channel = channel; | |
844 | res->pub.signal = signal; | |
7b8bcff2 | 845 | res->pub.tsf = tsf; |
06aa7afa JK |
846 | res->pub.beacon_interval = beacon_interval; |
847 | res->pub.capability = capability; | |
34a6eddb JM |
848 | /* |
849 | * Since we do not know here whether the IEs are from a Beacon or Probe | |
850 | * Response frame, we need to pick one of the options and only use it | |
851 | * with the driver that does not provide the full Beacon/Probe Response | |
852 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
853 | * override the information_elements pointer should we have received an | |
854 | * earlier indication of Probe Response data. | |
855 | * | |
856 | * The initial buffer for the IEs is allocated with the BSS entry and | |
857 | * is located after the private area. | |
858 | */ | |
859 | res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; | |
860 | memcpy(res->pub.beacon_ies, ie, ielen); | |
861 | res->pub.len_beacon_ies = ielen; | |
862 | res->pub.information_elements = res->pub.beacon_ies; | |
863 | res->pub.len_information_elements = res->pub.len_beacon_ies; | |
06aa7afa JK |
864 | |
865 | kref_init(&res->ref); | |
866 | ||
34a6eddb | 867 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); |
06aa7afa JK |
868 | if (!res) |
869 | return NULL; | |
870 | ||
871 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
872 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
873 | ||
4ee3e063 | 874 | trace_cfg80211_return_bss(&res->pub); |
06aa7afa JK |
875 | /* cfg80211_bss_update gives us a referenced result */ |
876 | return &res->pub; | |
877 | } | |
878 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
879 | ||
2a519311 JB |
880 | struct cfg80211_bss * |
881 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
882 | struct ieee80211_channel *channel, | |
883 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 884 | s32 signal, gfp_t gfp) |
2a519311 JB |
885 | { |
886 | struct cfg80211_internal_bss *res; | |
887 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
888 | u.probe_resp.variable); | |
bef9bacc MK |
889 | size_t privsz; |
890 | ||
0172bb75 JB |
891 | BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != |
892 | offsetof(struct ieee80211_mgmt, u.beacon.variable)); | |
893 | ||
4ee3e063 BL |
894 | trace_cfg80211_inform_bss_frame(wiphy, channel, mgmt, len, signal); |
895 | ||
bef9bacc MK |
896 | if (WARN_ON(!mgmt)) |
897 | return NULL; | |
898 | ||
899 | if (WARN_ON(!wiphy)) | |
900 | return NULL; | |
2a519311 | 901 | |
22fe88d3 | 902 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
768be59f | 903 | (signal < 0 || signal > 100))) |
2a519311 JB |
904 | return NULL; |
905 | ||
bef9bacc | 906 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
907 | return NULL; |
908 | ||
bef9bacc MK |
909 | privsz = wiphy->bss_priv_size; |
910 | ||
0172bb75 JB |
911 | channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable, |
912 | ielen, channel); | |
913 | if (!channel) | |
914 | return NULL; | |
915 | ||
2a519311 JB |
916 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); |
917 | if (!res) | |
918 | return NULL; | |
919 | ||
920 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
921 | res->pub.channel = channel; | |
2a519311 JB |
922 | res->pub.signal = signal; |
923 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
924 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
925 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
34a6eddb JM |
926 | /* |
927 | * The initial buffer for the IEs is allocated with the BSS entry and | |
928 | * is located after the private area. | |
929 | */ | |
930 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { | |
931 | res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; | |
932 | memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, | |
933 | ielen); | |
934 | res->pub.len_proberesp_ies = ielen; | |
935 | res->pub.information_elements = res->pub.proberesp_ies; | |
936 | res->pub.len_information_elements = res->pub.len_proberesp_ies; | |
937 | } else { | |
938 | res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; | |
939 | memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); | |
940 | res->pub.len_beacon_ies = ielen; | |
941 | res->pub.information_elements = res->pub.beacon_ies; | |
942 | res->pub.len_information_elements = res->pub.len_beacon_ies; | |
943 | } | |
2a519311 JB |
944 | |
945 | kref_init(&res->ref); | |
946 | ||
34a6eddb | 947 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); |
2a519311 JB |
948 | if (!res) |
949 | return NULL; | |
950 | ||
e38f8a7a LR |
951 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
952 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
953 | ||
4ee3e063 | 954 | trace_cfg80211_return_bss(&res->pub); |
2a519311 JB |
955 | /* cfg80211_bss_update gives us a referenced result */ |
956 | return &res->pub; | |
957 | } | |
958 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
959 | ||
4c0c0b75 JB |
960 | void cfg80211_ref_bss(struct cfg80211_bss *pub) |
961 | { | |
962 | struct cfg80211_internal_bss *bss; | |
963 | ||
964 | if (!pub) | |
965 | return; | |
966 | ||
967 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
968 | kref_get(&bss->ref); | |
969 | } | |
970 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
971 | ||
2a519311 JB |
972 | void cfg80211_put_bss(struct cfg80211_bss *pub) |
973 | { | |
974 | struct cfg80211_internal_bss *bss; | |
975 | ||
976 | if (!pub) | |
977 | return; | |
978 | ||
979 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
980 | kref_put(&bss->ref, bss_release); | |
981 | } | |
982 | EXPORT_SYMBOL(cfg80211_put_bss); | |
983 | ||
d491af19 JB |
984 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
985 | { | |
986 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
987 | struct cfg80211_internal_bss *bss; | |
988 | ||
989 | if (WARN_ON(!pub)) | |
990 | return; | |
991 | ||
992 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
993 | ||
994 | spin_lock_bh(&dev->bss_lock); | |
3207390a | 995 | if (!list_empty(&bss->list)) { |
2b78ac9b | 996 | __cfg80211_unlink_bss(dev, bss); |
3207390a | 997 | dev->bss_generation++; |
3207390a | 998 | } |
d491af19 | 999 | spin_unlock_bh(&dev->bss_lock); |
d491af19 JB |
1000 | } |
1001 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
1002 | ||
3d23e349 | 1003 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
1004 | int cfg80211_wext_siwscan(struct net_device *dev, |
1005 | struct iw_request_info *info, | |
1006 | union iwreq_data *wrqu, char *extra) | |
1007 | { | |
1008 | struct cfg80211_registered_device *rdev; | |
1009 | struct wiphy *wiphy; | |
1010 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 1011 | struct cfg80211_scan_request *creq = NULL; |
2a519311 JB |
1012 | int i, err, n_channels = 0; |
1013 | enum ieee80211_band band; | |
1014 | ||
1015 | if (!netif_running(dev)) | |
1016 | return -ENETDOWN; | |
1017 | ||
b2e3abdc HS |
1018 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
1019 | wreq = (struct iw_scan_req *)extra; | |
1020 | ||
463d0183 | 1021 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1022 | |
1023 | if (IS_ERR(rdev)) | |
1024 | return PTR_ERR(rdev); | |
1025 | ||
1026 | if (rdev->scan_req) { | |
1027 | err = -EBUSY; | |
1028 | goto out; | |
1029 | } | |
1030 | ||
1031 | wiphy = &rdev->wiphy; | |
1032 | ||
b2e3abdc HS |
1033 | /* Determine number of channels, needed to allocate creq */ |
1034 | if (wreq && wreq->num_channels) | |
1035 | n_channels = wreq->num_channels; | |
1036 | else { | |
1037 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
1038 | if (wiphy->bands[band]) | |
1039 | n_channels += wiphy->bands[band]->n_channels; | |
1040 | } | |
2a519311 JB |
1041 | |
1042 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
1043 | n_channels * sizeof(void *), | |
1044 | GFP_ATOMIC); | |
1045 | if (!creq) { | |
1046 | err = -ENOMEM; | |
1047 | goto out; | |
1048 | } | |
1049 | ||
1050 | creq->wiphy = wiphy; | |
fd014284 | 1051 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
1052 | /* SSIDs come after channels */ |
1053 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
1054 | creq->n_channels = n_channels; |
1055 | creq->n_ssids = 1; | |
15d6030b | 1056 | creq->scan_start = jiffies; |
2a519311 | 1057 | |
b2e3abdc | 1058 | /* translate "Scan on frequencies" request */ |
2a519311 JB |
1059 | i = 0; |
1060 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
1061 | int j; | |
584991dc | 1062 | |
2a519311 JB |
1063 | if (!wiphy->bands[band]) |
1064 | continue; | |
584991dc | 1065 | |
2a519311 | 1066 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
1067 | /* ignore disabled channels */ |
1068 | if (wiphy->bands[band]->channels[j].flags & | |
1069 | IEEE80211_CHAN_DISABLED) | |
1070 | continue; | |
b2e3abdc HS |
1071 | |
1072 | /* If we have a wireless request structure and the | |
1073 | * wireless request specifies frequencies, then search | |
1074 | * for the matching hardware channel. | |
1075 | */ | |
1076 | if (wreq && wreq->num_channels) { | |
1077 | int k; | |
1078 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
1079 | for (k = 0; k < wreq->num_channels; k++) { | |
a4e7b730 | 1080 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
b2e3abdc HS |
1081 | if (wext_freq == wiphy_freq) |
1082 | goto wext_freq_found; | |
1083 | } | |
1084 | goto wext_freq_not_found; | |
1085 | } | |
1086 | ||
1087 | wext_freq_found: | |
2a519311 JB |
1088 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
1089 | i++; | |
b2e3abdc | 1090 | wext_freq_not_found: ; |
2a519311 JB |
1091 | } |
1092 | } | |
8862dc5f HS |
1093 | /* No channels found? */ |
1094 | if (!i) { | |
1095 | err = -EINVAL; | |
1096 | goto out; | |
1097 | } | |
2a519311 | 1098 | |
b2e3abdc HS |
1099 | /* Set real number of channels specified in creq->channels[] */ |
1100 | creq->n_channels = i; | |
2a519311 | 1101 | |
b2e3abdc HS |
1102 | /* translate "Scan for SSID" request */ |
1103 | if (wreq) { | |
2a519311 | 1104 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1105 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1106 | err = -EINVAL; | |
1107 | goto out; | |
1108 | } | |
2a519311 JB |
1109 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1110 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1111 | } | |
1112 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1113 | creq->n_ssids = 0; | |
1114 | } | |
1115 | ||
34850ab2 | 1116 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
a401d2bb JB |
1117 | if (wiphy->bands[i]) |
1118 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1119 | |
2a519311 | 1120 | rdev->scan_req = creq; |
e35e4d28 | 1121 | err = rdev_scan(rdev, creq); |
2a519311 JB |
1122 | if (err) { |
1123 | rdev->scan_req = NULL; | |
65486c8b | 1124 | /* creq will be freed below */ |
463d0183 | 1125 | } else { |
fd014284 | 1126 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1127 | /* creq now owned by driver */ |
1128 | creq = NULL; | |
463d0183 JB |
1129 | dev_hold(dev); |
1130 | } | |
2a519311 | 1131 | out: |
65486c8b | 1132 | kfree(creq); |
4d0c8aea | 1133 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1134 | return err; |
1135 | } | |
ba44cb72 | 1136 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
1137 | |
1138 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
1139 | struct cfg80211_bss *bss, | |
1140 | char **current_ev, char *end_buf) | |
1141 | { | |
1142 | u8 *pos, *end, *next; | |
1143 | struct iw_event iwe; | |
1144 | ||
1145 | if (!bss->information_elements || | |
1146 | !bss->len_information_elements) | |
1147 | return; | |
1148 | ||
1149 | /* | |
1150 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1151 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1152 | */ | |
1153 | pos = bss->information_elements; | |
1154 | end = pos + bss->len_information_elements; | |
1155 | ||
1156 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1157 | next = pos + 2 + pos[1]; | |
1158 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1159 | next = next + 2 + next[1]; | |
1160 | ||
1161 | memset(&iwe, 0, sizeof(iwe)); | |
1162 | iwe.cmd = IWEVGENIE; | |
1163 | iwe.u.data.length = next - pos; | |
1164 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
1165 | end_buf, &iwe, pos); | |
1166 | ||
1167 | pos = next; | |
1168 | } | |
1169 | ||
1170 | if (end > pos) { | |
1171 | memset(&iwe, 0, sizeof(iwe)); | |
1172 | iwe.cmd = IWEVGENIE; | |
1173 | iwe.u.data.length = end - pos; | |
1174 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
1175 | end_buf, &iwe, pos); | |
1176 | } | |
1177 | } | |
1178 | ||
cb3a8eec DW |
1179 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
1180 | { | |
1181 | unsigned long end = jiffies; | |
1182 | ||
1183 | if (end >= start) | |
1184 | return jiffies_to_msecs(end - start); | |
1185 | ||
1186 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
1187 | } | |
2a519311 JB |
1188 | |
1189 | static char * | |
77965c97 JB |
1190 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1191 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1192 | char *end_buf) | |
2a519311 JB |
1193 | { |
1194 | struct iw_event iwe; | |
1195 | u8 *buf, *cfg, *p; | |
1196 | u8 *ie = bss->pub.information_elements; | |
a77b8552 | 1197 | int rem = bss->pub.len_information_elements, i, sig; |
2a519311 JB |
1198 | bool ismesh = false; |
1199 | ||
1200 | memset(&iwe, 0, sizeof(iwe)); | |
1201 | iwe.cmd = SIOCGIWAP; | |
1202 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1203 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
1204 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1205 | IW_EV_ADDR_LEN); | |
1206 | ||
1207 | memset(&iwe, 0, sizeof(iwe)); | |
1208 | iwe.cmd = SIOCGIWFREQ; | |
1209 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1210 | iwe.u.freq.e = 0; | |
1211 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1212 | IW_EV_FREQ_LEN); | |
1213 | ||
1214 | memset(&iwe, 0, sizeof(iwe)); | |
1215 | iwe.cmd = SIOCGIWFREQ; | |
1216 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1217 | iwe.u.freq.e = 6; | |
1218 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1219 | IW_EV_FREQ_LEN); | |
1220 | ||
77965c97 | 1221 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1222 | memset(&iwe, 0, sizeof(iwe)); |
1223 | iwe.cmd = IWEVQUAL; | |
1224 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1225 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1226 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1227 | switch (wiphy->signal_type) { |
2a519311 | 1228 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1229 | sig = bss->pub.signal / 100; |
1230 | iwe.u.qual.level = sig; | |
2a519311 | 1231 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1232 | if (sig < -110) /* rather bad */ |
1233 | sig = -110; | |
1234 | else if (sig > -40) /* perfect */ | |
1235 | sig = -40; | |
1236 | /* will give a range of 0 .. 70 */ | |
1237 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1238 | break; |
1239 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1240 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1241 | /* will give range 0 .. 100 */ |
1242 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1243 | break; |
1244 | default: | |
1245 | /* not reached */ | |
1246 | break; | |
1247 | } | |
1248 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1249 | &iwe, IW_EV_QUAL_LEN); | |
1250 | } | |
1251 | ||
1252 | memset(&iwe, 0, sizeof(iwe)); | |
1253 | iwe.cmd = SIOCGIWENCODE; | |
1254 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1255 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1256 | else | |
1257 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1258 | iwe.u.data.length = 0; | |
1259 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1260 | &iwe, ""); | |
1261 | ||
1262 | while (rem >= 2) { | |
1263 | /* invalid data */ | |
1264 | if (ie[1] > rem - 2) | |
1265 | break; | |
1266 | ||
1267 | switch (ie[0]) { | |
1268 | case WLAN_EID_SSID: | |
1269 | memset(&iwe, 0, sizeof(iwe)); | |
1270 | iwe.cmd = SIOCGIWESSID; | |
1271 | iwe.u.data.length = ie[1]; | |
1272 | iwe.u.data.flags = 1; | |
1273 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1274 | &iwe, ie + 2); | |
1275 | break; | |
1276 | case WLAN_EID_MESH_ID: | |
1277 | memset(&iwe, 0, sizeof(iwe)); | |
1278 | iwe.cmd = SIOCGIWESSID; | |
1279 | iwe.u.data.length = ie[1]; | |
1280 | iwe.u.data.flags = 1; | |
1281 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1282 | &iwe, ie + 2); | |
1283 | break; | |
1284 | case WLAN_EID_MESH_CONFIG: | |
1285 | ismesh = true; | |
136cfa28 | 1286 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
1287 | break; |
1288 | buf = kmalloc(50, GFP_ATOMIC); | |
1289 | if (!buf) | |
1290 | break; | |
1291 | cfg = ie + 2; | |
1292 | memset(&iwe, 0, sizeof(iwe)); | |
1293 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1294 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1295 | "0x%02X", cfg[0]); | |
2a519311 JB |
1296 | iwe.u.data.length = strlen(buf); |
1297 | current_ev = iwe_stream_add_point(info, current_ev, | |
1298 | end_buf, | |
1299 | &iwe, buf); | |
76aa5e70 RP |
1300 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1301 | cfg[1]); | |
2a519311 JB |
1302 | iwe.u.data.length = strlen(buf); |
1303 | current_ev = iwe_stream_add_point(info, current_ev, | |
1304 | end_buf, | |
1305 | &iwe, buf); | |
76aa5e70 RP |
1306 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1307 | cfg[2]); | |
2a519311 JB |
1308 | iwe.u.data.length = strlen(buf); |
1309 | current_ev = iwe_stream_add_point(info, current_ev, | |
1310 | end_buf, | |
1311 | &iwe, buf); | |
76aa5e70 | 1312 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 JB |
1313 | iwe.u.data.length = strlen(buf); |
1314 | current_ev = iwe_stream_add_point(info, current_ev, | |
1315 | end_buf, | |
1316 | &iwe, buf); | |
76aa5e70 RP |
1317 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1318 | iwe.u.data.length = strlen(buf); | |
1319 | current_ev = iwe_stream_add_point(info, current_ev, | |
1320 | end_buf, | |
1321 | &iwe, buf); | |
1322 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); | |
1323 | iwe.u.data.length = strlen(buf); | |
1324 | current_ev = iwe_stream_add_point(info, current_ev, | |
1325 | end_buf, | |
1326 | &iwe, buf); | |
1327 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); | |
2a519311 JB |
1328 | iwe.u.data.length = strlen(buf); |
1329 | current_ev = iwe_stream_add_point(info, current_ev, | |
1330 | end_buf, | |
1331 | &iwe, buf); | |
1332 | kfree(buf); | |
1333 | break; | |
1334 | case WLAN_EID_SUPP_RATES: | |
1335 | case WLAN_EID_EXT_SUPP_RATES: | |
1336 | /* display all supported rates in readable format */ | |
1337 | p = current_ev + iwe_stream_lcp_len(info); | |
1338 | ||
1339 | memset(&iwe, 0, sizeof(iwe)); | |
1340 | iwe.cmd = SIOCGIWRATE; | |
1341 | /* Those two flags are ignored... */ | |
1342 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1343 | ||
1344 | for (i = 0; i < ie[1]; i++) { | |
1345 | iwe.u.bitrate.value = | |
1346 | ((ie[i + 2] & 0x7f) * 500000); | |
1347 | p = iwe_stream_add_value(info, current_ev, p, | |
1348 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
1349 | } | |
1350 | current_ev = p; | |
1351 | break; | |
1352 | } | |
1353 | rem -= ie[1] + 2; | |
1354 | ie += ie[1] + 2; | |
1355 | } | |
1356 | ||
f64f9e71 JP |
1357 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1358 | ismesh) { | |
2a519311 JB |
1359 | memset(&iwe, 0, sizeof(iwe)); |
1360 | iwe.cmd = SIOCGIWMODE; | |
1361 | if (ismesh) | |
1362 | iwe.u.mode = IW_MODE_MESH; | |
1363 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1364 | iwe.u.mode = IW_MODE_MASTER; | |
1365 | else | |
1366 | iwe.u.mode = IW_MODE_ADHOC; | |
1367 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1368 | &iwe, IW_EV_UINT_LEN); | |
1369 | } | |
1370 | ||
1371 | buf = kmalloc(30, GFP_ATOMIC); | |
1372 | if (buf) { | |
1373 | memset(&iwe, 0, sizeof(iwe)); | |
1374 | iwe.cmd = IWEVCUSTOM; | |
1375 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
1376 | iwe.u.data.length = strlen(buf); | |
1377 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1378 | &iwe, buf); | |
1379 | memset(&iwe, 0, sizeof(iwe)); | |
1380 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
1381 | sprintf(buf, " Last beacon: %ums ago", |
1382 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
1383 | iwe.u.data.length = strlen(buf); |
1384 | current_ev = iwe_stream_add_point(info, current_ev, | |
1385 | end_buf, &iwe, buf); | |
1386 | kfree(buf); | |
1387 | } | |
1388 | ||
1389 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
1390 | ||
1391 | return current_ev; | |
1392 | } | |
1393 | ||
1394 | ||
1395 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
1396 | struct iw_request_info *info, | |
1397 | char *buf, size_t len) | |
1398 | { | |
1399 | char *current_ev = buf; | |
1400 | char *end_buf = buf + len; | |
1401 | struct cfg80211_internal_bss *bss; | |
1402 | ||
1403 | spin_lock_bh(&dev->bss_lock); | |
1404 | cfg80211_bss_expire(dev); | |
1405 | ||
1406 | list_for_each_entry(bss, &dev->bss_list, list) { | |
1407 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
1408 | spin_unlock_bh(&dev->bss_lock); | |
1409 | return -E2BIG; | |
1410 | } | |
77965c97 JB |
1411 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
1412 | current_ev, end_buf); | |
2a519311 JB |
1413 | } |
1414 | spin_unlock_bh(&dev->bss_lock); | |
1415 | return current_ev - buf; | |
1416 | } | |
1417 | ||
1418 | ||
1419 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1420 | struct iw_request_info *info, | |
1421 | struct iw_point *data, char *extra) | |
1422 | { | |
1423 | struct cfg80211_registered_device *rdev; | |
1424 | int res; | |
1425 | ||
1426 | if (!netif_running(dev)) | |
1427 | return -ENETDOWN; | |
1428 | ||
463d0183 | 1429 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1430 | |
1431 | if (IS_ERR(rdev)) | |
1432 | return PTR_ERR(rdev); | |
1433 | ||
1434 | if (rdev->scan_req) { | |
1435 | res = -EAGAIN; | |
1436 | goto out; | |
1437 | } | |
1438 | ||
1439 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1440 | data->length = 0; | |
1441 | if (res >= 0) { | |
1442 | data->length = res; | |
1443 | res = 0; | |
1444 | } | |
1445 | ||
1446 | out: | |
4d0c8aea | 1447 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1448 | return res; |
1449 | } | |
ba44cb72 | 1450 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 1451 | #endif |