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" |
2a519311 | 20 | |
f9616e0f | 21 | #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) |
2a519311 | 22 | |
01a0ac41 | 23 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) |
2a519311 | 24 | { |
667503dd | 25 | struct cfg80211_scan_request *request; |
fd014284 | 26 | struct wireless_dev *wdev; |
3d23e349 | 27 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
28 | union iwreq_data wrqu; |
29 | #endif | |
30 | ||
01a0ac41 JB |
31 | ASSERT_RDEV_LOCK(rdev); |
32 | ||
667503dd JB |
33 | request = rdev->scan_req; |
34 | ||
01a0ac41 JB |
35 | if (!request) |
36 | return; | |
37 | ||
fd014284 | 38 | wdev = request->wdev; |
2a519311 | 39 | |
6829c878 JB |
40 | /* |
41 | * This must be before sending the other events! | |
42 | * Otherwise, wpa_supplicant gets completely confused with | |
43 | * wext events. | |
44 | */ | |
fd014284 JB |
45 | if (wdev->netdev) |
46 | cfg80211_sme_scan_done(wdev->netdev); | |
6829c878 | 47 | |
667503dd | 48 | if (request->aborted) |
fd014284 | 49 | nl80211_send_scan_aborted(rdev, wdev); |
2a519311 | 50 | else |
fd014284 | 51 | nl80211_send_scan_done(rdev, wdev); |
2a519311 | 52 | |
3d23e349 | 53 | #ifdef CONFIG_CFG80211_WEXT |
fd014284 | 54 | if (wdev->netdev && !request->aborted) { |
2a519311 JB |
55 | memset(&wrqu, 0, sizeof(wrqu)); |
56 | ||
fd014284 | 57 | wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); |
2a519311 JB |
58 | } |
59 | #endif | |
60 | ||
fd014284 JB |
61 | if (wdev->netdev) |
62 | dev_put(wdev->netdev); | |
2a519311 | 63 | |
36e6fea8 | 64 | rdev->scan_req = NULL; |
01a0ac41 JB |
65 | |
66 | /* | |
67 | * OK. If this is invoked with "leak" then we can't | |
68 | * free this ... but we've cleaned it up anyway. The | |
69 | * driver failed to call the scan_done callback, so | |
70 | * all bets are off, it might still be trying to use | |
71 | * the scan request or not ... if it accesses the dev | |
72 | * in there (it shouldn't anyway) then it may crash. | |
73 | */ | |
74 | if (!leak) | |
75 | kfree(request); | |
2a519311 | 76 | } |
667503dd | 77 | |
36e6fea8 JB |
78 | void __cfg80211_scan_done(struct work_struct *wk) |
79 | { | |
80 | struct cfg80211_registered_device *rdev; | |
81 | ||
82 | rdev = container_of(wk, struct cfg80211_registered_device, | |
83 | scan_done_wk); | |
84 | ||
85 | cfg80211_lock_rdev(rdev); | |
01a0ac41 | 86 | ___cfg80211_scan_done(rdev, false); |
36e6fea8 JB |
87 | cfg80211_unlock_rdev(rdev); |
88 | } | |
89 | ||
667503dd JB |
90 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
91 | { | |
667503dd JB |
92 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
93 | ||
94 | request->aborted = aborted; | |
e60d7443 | 95 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
667503dd | 96 | } |
2a519311 JB |
97 | EXPORT_SYMBOL(cfg80211_scan_done); |
98 | ||
807f8a8c LC |
99 | void __cfg80211_sched_scan_results(struct work_struct *wk) |
100 | { | |
101 | struct cfg80211_registered_device *rdev; | |
102 | ||
103 | rdev = container_of(wk, struct cfg80211_registered_device, | |
104 | sched_scan_results_wk); | |
105 | ||
c10841ca | 106 | mutex_lock(&rdev->sched_scan_mtx); |
807f8a8c LC |
107 | |
108 | /* we don't have sched_scan_req anymore if the scan is stopping */ | |
109 | if (rdev->sched_scan_req) | |
110 | nl80211_send_sched_scan_results(rdev, | |
111 | rdev->sched_scan_req->dev); | |
112 | ||
c10841ca | 113 | mutex_unlock(&rdev->sched_scan_mtx); |
807f8a8c LC |
114 | } |
115 | ||
116 | void cfg80211_sched_scan_results(struct wiphy *wiphy) | |
117 | { | |
118 | /* ignore if we're not scanning */ | |
119 | if (wiphy_to_dev(wiphy)->sched_scan_req) | |
120 | queue_work(cfg80211_wq, | |
121 | &wiphy_to_dev(wiphy)->sched_scan_results_wk); | |
122 | } | |
123 | EXPORT_SYMBOL(cfg80211_sched_scan_results); | |
124 | ||
85a9994a | 125 | void cfg80211_sched_scan_stopped(struct wiphy *wiphy) |
807f8a8c | 126 | { |
85a9994a | 127 | struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy); |
807f8a8c | 128 | |
c10841ca | 129 | mutex_lock(&rdev->sched_scan_mtx); |
807f8a8c | 130 | __cfg80211_stop_sched_scan(rdev, true); |
c10841ca | 131 | mutex_unlock(&rdev->sched_scan_mtx); |
807f8a8c | 132 | } |
807f8a8c LC |
133 | EXPORT_SYMBOL(cfg80211_sched_scan_stopped); |
134 | ||
135 | int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, | |
136 | bool driver_initiated) | |
137 | { | |
807f8a8c LC |
138 | struct net_device *dev; |
139 | ||
c10841ca | 140 | lockdep_assert_held(&rdev->sched_scan_mtx); |
807f8a8c LC |
141 | |
142 | if (!rdev->sched_scan_req) | |
1a84ff75 | 143 | return -ENOENT; |
807f8a8c LC |
144 | |
145 | dev = rdev->sched_scan_req->dev; | |
146 | ||
85a9994a | 147 | if (!driver_initiated) { |
3b4670ff | 148 | int err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev); |
85a9994a LC |
149 | if (err) |
150 | return err; | |
151 | } | |
807f8a8c LC |
152 | |
153 | nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED); | |
154 | ||
155 | kfree(rdev->sched_scan_req); | |
156 | rdev->sched_scan_req = NULL; | |
157 | ||
3b4670ff | 158 | return 0; |
807f8a8c LC |
159 | } |
160 | ||
2a519311 JB |
161 | static void bss_release(struct kref *ref) |
162 | { | |
163 | struct cfg80211_internal_bss *bss; | |
164 | ||
165 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
78c1c7e1 JB |
166 | if (bss->pub.free_priv) |
167 | bss->pub.free_priv(&bss->pub); | |
cd1658f5 | 168 | |
34a6eddb JM |
169 | if (bss->beacon_ies_allocated) |
170 | kfree(bss->pub.beacon_ies); | |
171 | if (bss->proberesp_ies_allocated) | |
172 | kfree(bss->pub.proberesp_ies); | |
cd1658f5 | 173 | |
19957bb3 JB |
174 | BUG_ON(atomic_read(&bss->hold)); |
175 | ||
2a519311 JB |
176 | kfree(bss); |
177 | } | |
178 | ||
cb3a8eec DW |
179 | /* must hold dev->bss_lock! */ |
180 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
181 | unsigned long age_secs) | |
182 | { | |
183 | struct cfg80211_internal_bss *bss; | |
184 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
185 | ||
186 | list_for_each_entry(bss, &dev->bss_list, list) { | |
187 | bss->ts -= age_jiffies; | |
188 | } | |
189 | } | |
190 | ||
2b78ac9b JO |
191 | /* must hold dev->bss_lock! */ |
192 | static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev, | |
193 | struct cfg80211_internal_bss *bss) | |
194 | { | |
195 | list_del_init(&bss->list); | |
196 | rb_erase(&bss->rbn, &dev->bss_tree); | |
197 | kref_put(&bss->ref, bss_release); | |
198 | } | |
199 | ||
2a519311 JB |
200 | /* must hold dev->bss_lock! */ |
201 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
202 | { | |
203 | struct cfg80211_internal_bss *bss, *tmp; | |
204 | bool expired = false; | |
205 | ||
206 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
19957bb3 JB |
207 | if (atomic_read(&bss->hold)) |
208 | continue; | |
209 | if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
2a519311 | 210 | continue; |
2b78ac9b | 211 | __cfg80211_unlink_bss(dev, bss); |
2a519311 JB |
212 | expired = true; |
213 | } | |
214 | ||
215 | if (expired) | |
216 | dev->bss_generation++; | |
217 | } | |
218 | ||
c21dbf92 | 219 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
2a519311 | 220 | { |
c21dbf92 | 221 | while (len > 2 && ies[0] != eid) { |
2a519311 JB |
222 | len -= ies[1] + 2; |
223 | ies += ies[1] + 2; | |
224 | } | |
225 | if (len < 2) | |
226 | return NULL; | |
227 | if (len < 2 + ies[1]) | |
228 | return NULL; | |
229 | return ies; | |
230 | } | |
c21dbf92 | 231 | EXPORT_SYMBOL(cfg80211_find_ie); |
2a519311 | 232 | |
0c28ec58 EP |
233 | const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type, |
234 | const u8 *ies, int len) | |
235 | { | |
236 | struct ieee80211_vendor_ie *ie; | |
237 | const u8 *pos = ies, *end = ies + len; | |
238 | int ie_oui; | |
239 | ||
240 | while (pos < end) { | |
241 | pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos, | |
242 | end - pos); | |
243 | if (!pos) | |
244 | return NULL; | |
245 | ||
246 | if (end - pos < sizeof(*ie)) | |
247 | return NULL; | |
248 | ||
249 | ie = (struct ieee80211_vendor_ie *)pos; | |
250 | ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2]; | |
251 | if (ie_oui == oui && ie->oui_type == oui_type) | |
252 | return pos; | |
253 | ||
254 | pos += 2 + ie->len; | |
255 | } | |
256 | return NULL; | |
257 | } | |
258 | EXPORT_SYMBOL(cfg80211_find_vendor_ie); | |
259 | ||
2a519311 JB |
260 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) |
261 | { | |
c21dbf92 JB |
262 | const u8 *ie1 = cfg80211_find_ie(num, ies1, len1); |
263 | const u8 *ie2 = cfg80211_find_ie(num, ies2, len2); | |
2a519311 | 264 | |
3b6ef633 | 265 | /* equal if both missing */ |
2a519311 JB |
266 | if (!ie1 && !ie2) |
267 | return 0; | |
3b6ef633 JB |
268 | /* sort missing IE before (left of) present IE */ |
269 | if (!ie1) | |
2a519311 | 270 | return -1; |
3b6ef633 JB |
271 | if (!ie2) |
272 | return 1; | |
2a519311 | 273 | |
3b6ef633 JB |
274 | /* sort by length first, then by contents */ |
275 | if (ie1[1] != ie2[1]) | |
2a519311 | 276 | return ie2[1] - ie1[1]; |
3b6ef633 | 277 | return memcmp(ie1 + 2, ie2 + 2, ie1[1]); |
2a519311 JB |
278 | } |
279 | ||
280 | static bool is_bss(struct cfg80211_bss *a, | |
281 | const u8 *bssid, | |
282 | const u8 *ssid, size_t ssid_len) | |
283 | { | |
284 | const u8 *ssidie; | |
285 | ||
ac422d3c | 286 | if (bssid && !ether_addr_equal(a->bssid, bssid)) |
2a519311 JB |
287 | return false; |
288 | ||
79420f09 JB |
289 | if (!ssid) |
290 | return true; | |
291 | ||
c21dbf92 JB |
292 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, |
293 | a->information_elements, | |
294 | a->len_information_elements); | |
2a519311 JB |
295 | if (!ssidie) |
296 | return false; | |
297 | if (ssidie[1] != ssid_len) | |
298 | return false; | |
299 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
300 | } | |
301 | ||
333ba732 EP |
302 | static bool is_mesh_bss(struct cfg80211_bss *a) |
303 | { | |
304 | const u8 *ie; | |
305 | ||
306 | if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) | |
307 | return false; | |
308 | ||
309 | ie = cfg80211_find_ie(WLAN_EID_MESH_ID, | |
310 | a->information_elements, | |
311 | a->len_information_elements); | |
312 | if (!ie) | |
313 | return false; | |
314 | ||
315 | ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
316 | a->information_elements, | |
317 | a->len_information_elements); | |
318 | if (!ie) | |
319 | return false; | |
320 | ||
321 | return true; | |
322 | } | |
323 | ||
2a519311 JB |
324 | static bool is_mesh(struct cfg80211_bss *a, |
325 | const u8 *meshid, size_t meshidlen, | |
326 | const u8 *meshcfg) | |
327 | { | |
328 | const u8 *ie; | |
329 | ||
333ba732 | 330 | if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability)) |
2a519311 JB |
331 | return false; |
332 | ||
c21dbf92 JB |
333 | ie = cfg80211_find_ie(WLAN_EID_MESH_ID, |
334 | a->information_elements, | |
335 | a->len_information_elements); | |
2a519311 JB |
336 | if (!ie) |
337 | return false; | |
338 | if (ie[1] != meshidlen) | |
339 | return false; | |
340 | if (memcmp(ie + 2, meshid, meshidlen)) | |
341 | return false; | |
342 | ||
c21dbf92 JB |
343 | ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
344 | a->information_elements, | |
345 | a->len_information_elements); | |
cd3468ba JB |
346 | if (!ie) |
347 | return false; | |
136cfa28 | 348 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
349 | return false; |
350 | ||
351 | /* | |
352 | * Ignore mesh capability (last two bytes of the IE) when | |
353 | * comparing since that may differ between stations taking | |
354 | * part in the same mesh. | |
355 | */ | |
136cfa28 RP |
356 | return memcmp(ie + 2, meshcfg, |
357 | sizeof(struct ieee80211_meshconf_ie) - 2) == 0; | |
2a519311 JB |
358 | } |
359 | ||
dd9dfb9f DT |
360 | static int cmp_bss_core(struct cfg80211_bss *a, |
361 | struct cfg80211_bss *b) | |
2a519311 JB |
362 | { |
363 | int r; | |
364 | ||
365 | if (a->channel != b->channel) | |
366 | return b->channel->center_freq - a->channel->center_freq; | |
367 | ||
333ba732 | 368 | if (is_mesh_bss(a) && is_mesh_bss(b)) { |
2a519311 JB |
369 | r = cmp_ies(WLAN_EID_MESH_ID, |
370 | a->information_elements, | |
371 | a->len_information_elements, | |
372 | b->information_elements, | |
373 | b->len_information_elements); | |
374 | if (r) | |
375 | return r; | |
376 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
377 | a->information_elements, | |
378 | a->len_information_elements, | |
379 | b->information_elements, | |
380 | b->len_information_elements); | |
381 | } | |
382 | ||
ef9456a8 EG |
383 | /* |
384 | * we can't use compare_ether_addr here since we need a < > operator. | |
385 | * The binary return value of compare_ether_addr isn't enough | |
386 | */ | |
387 | return memcmp(a->bssid, b->bssid, sizeof(a->bssid)); | |
dd9dfb9f DT |
388 | } |
389 | ||
390 | static int cmp_bss(struct cfg80211_bss *a, | |
391 | struct cfg80211_bss *b) | |
392 | { | |
393 | int r; | |
394 | ||
395 | r = cmp_bss_core(a, b); | |
0a35d36d JC |
396 | if (r) |
397 | return r; | |
398 | ||
2a519311 JB |
399 | return cmp_ies(WLAN_EID_SSID, |
400 | a->information_elements, | |
401 | a->len_information_elements, | |
402 | b->information_elements, | |
403 | b->len_information_elements); | |
404 | } | |
405 | ||
dd9dfb9f DT |
406 | static int cmp_hidden_bss(struct cfg80211_bss *a, |
407 | struct cfg80211_bss *b) | |
408 | { | |
409 | const u8 *ie1; | |
410 | const u8 *ie2; | |
411 | int i; | |
412 | int r; | |
413 | ||
414 | r = cmp_bss_core(a, b); | |
415 | if (r) | |
416 | return r; | |
417 | ||
418 | ie1 = cfg80211_find_ie(WLAN_EID_SSID, | |
419 | a->information_elements, | |
420 | a->len_information_elements); | |
421 | ie2 = cfg80211_find_ie(WLAN_EID_SSID, | |
422 | b->information_elements, | |
423 | b->len_information_elements); | |
424 | ||
425 | /* Key comparator must use same algorithm in any rb-tree | |
426 | * search function (order is important), otherwise ordering | |
427 | * of items in the tree is broken and search gives incorrect | |
428 | * results. This code uses same order as cmp_ies() does. */ | |
429 | ||
430 | /* sort missing IE before (left of) present IE */ | |
431 | if (!ie1) | |
432 | return -1; | |
433 | if (!ie2) | |
434 | return 1; | |
435 | ||
436 | /* zero-size SSID is used as an indication of the hidden bss */ | |
437 | if (!ie2[1]) | |
438 | return 0; | |
439 | ||
440 | /* sort by length first, then by contents */ | |
441 | if (ie1[1] != ie2[1]) | |
442 | return ie2[1] - ie1[1]; | |
443 | ||
444 | /* zeroed SSID ie is another indication of a hidden bss */ | |
445 | for (i = 0; i < ie2[1]; i++) | |
446 | if (ie2[i + 2]) | |
447 | return -1; | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
2a519311 JB |
452 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, |
453 | struct ieee80211_channel *channel, | |
454 | const u8 *bssid, | |
79420f09 JB |
455 | const u8 *ssid, size_t ssid_len, |
456 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
457 | { |
458 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
459 | struct cfg80211_internal_bss *bss, *res = NULL; | |
ccb6c136 | 460 | unsigned long now = jiffies; |
2a519311 JB |
461 | |
462 | spin_lock_bh(&dev->bss_lock); | |
463 | ||
464 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
465 | if ((bss->pub.capability & capa_mask) != capa_val) |
466 | continue; | |
2a519311 JB |
467 | if (channel && bss->pub.channel != channel) |
468 | continue; | |
ccb6c136 JB |
469 | /* Don't get expired BSS structs */ |
470 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
471 | !atomic_read(&bss->hold)) | |
472 | continue; | |
2a519311 JB |
473 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
474 | res = bss; | |
475 | kref_get(&res->ref); | |
476 | break; | |
477 | } | |
478 | } | |
479 | ||
480 | spin_unlock_bh(&dev->bss_lock); | |
481 | if (!res) | |
482 | return NULL; | |
483 | return &res->pub; | |
484 | } | |
485 | EXPORT_SYMBOL(cfg80211_get_bss); | |
486 | ||
487 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
488 | struct ieee80211_channel *channel, | |
489 | const u8 *meshid, size_t meshidlen, | |
490 | const u8 *meshcfg) | |
491 | { | |
492 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
493 | struct cfg80211_internal_bss *bss, *res = NULL; | |
494 | ||
495 | spin_lock_bh(&dev->bss_lock); | |
496 | ||
497 | list_for_each_entry(bss, &dev->bss_list, list) { | |
498 | if (channel && bss->pub.channel != channel) | |
499 | continue; | |
500 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
501 | res = bss; | |
502 | kref_get(&res->ref); | |
503 | break; | |
504 | } | |
505 | } | |
506 | ||
507 | spin_unlock_bh(&dev->bss_lock); | |
508 | if (!res) | |
509 | return NULL; | |
510 | return &res->pub; | |
511 | } | |
512 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
513 | ||
514 | ||
515 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
516 | struct cfg80211_internal_bss *bss) | |
517 | { | |
518 | struct rb_node **p = &dev->bss_tree.rb_node; | |
519 | struct rb_node *parent = NULL; | |
520 | struct cfg80211_internal_bss *tbss; | |
521 | int cmp; | |
522 | ||
523 | while (*p) { | |
524 | parent = *p; | |
525 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
526 | ||
527 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
528 | ||
529 | if (WARN_ON(!cmp)) { | |
530 | /* will sort of leak this BSS */ | |
531 | return; | |
532 | } | |
533 | ||
534 | if (cmp < 0) | |
535 | p = &(*p)->rb_left; | |
536 | else | |
537 | p = &(*p)->rb_right; | |
538 | } | |
539 | ||
540 | rb_link_node(&bss->rbn, parent, p); | |
541 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
542 | } | |
543 | ||
544 | static struct cfg80211_internal_bss * | |
545 | rb_find_bss(struct cfg80211_registered_device *dev, | |
546 | struct cfg80211_internal_bss *res) | |
547 | { | |
548 | struct rb_node *n = dev->bss_tree.rb_node; | |
549 | struct cfg80211_internal_bss *bss; | |
550 | int r; | |
551 | ||
552 | while (n) { | |
553 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
554 | r = cmp_bss(&res->pub, &bss->pub); | |
555 | ||
556 | if (r == 0) | |
557 | return bss; | |
558 | else if (r < 0) | |
559 | n = n->rb_left; | |
560 | else | |
561 | n = n->rb_right; | |
562 | } | |
563 | ||
564 | return NULL; | |
565 | } | |
566 | ||
dd9dfb9f DT |
567 | static struct cfg80211_internal_bss * |
568 | rb_find_hidden_bss(struct cfg80211_registered_device *dev, | |
569 | struct cfg80211_internal_bss *res) | |
570 | { | |
571 | struct rb_node *n = dev->bss_tree.rb_node; | |
572 | struct cfg80211_internal_bss *bss; | |
573 | int r; | |
574 | ||
575 | while (n) { | |
576 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
577 | r = cmp_hidden_bss(&res->pub, &bss->pub); | |
578 | ||
579 | if (r == 0) | |
580 | return bss; | |
581 | else if (r < 0) | |
582 | n = n->rb_left; | |
583 | else | |
584 | n = n->rb_right; | |
585 | } | |
586 | ||
587 | return NULL; | |
588 | } | |
589 | ||
590 | static void | |
591 | copy_hidden_ies(struct cfg80211_internal_bss *res, | |
592 | struct cfg80211_internal_bss *hidden) | |
593 | { | |
594 | if (unlikely(res->pub.beacon_ies)) | |
595 | return; | |
596 | if (WARN_ON(!hidden->pub.beacon_ies)) | |
597 | return; | |
598 | ||
599 | res->pub.beacon_ies = kmalloc(hidden->pub.len_beacon_ies, GFP_ATOMIC); | |
600 | if (unlikely(!res->pub.beacon_ies)) | |
601 | return; | |
602 | ||
603 | res->beacon_ies_allocated = true; | |
604 | res->pub.len_beacon_ies = hidden->pub.len_beacon_ies; | |
605 | memcpy(res->pub.beacon_ies, hidden->pub.beacon_ies, | |
606 | res->pub.len_beacon_ies); | |
607 | } | |
608 | ||
2a519311 JB |
609 | static struct cfg80211_internal_bss * |
610 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
34a6eddb | 611 | struct cfg80211_internal_bss *res) |
2a519311 JB |
612 | { |
613 | struct cfg80211_internal_bss *found = NULL; | |
2a519311 JB |
614 | |
615 | /* | |
616 | * The reference to "res" is donated to this function. | |
617 | */ | |
618 | ||
619 | if (WARN_ON(!res->pub.channel)) { | |
620 | kref_put(&res->ref, bss_release); | |
621 | return NULL; | |
622 | } | |
623 | ||
624 | res->ts = jiffies; | |
625 | ||
2a519311 JB |
626 | spin_lock_bh(&dev->bss_lock); |
627 | ||
628 | found = rb_find_bss(dev, res); | |
629 | ||
cd1658f5 | 630 | if (found) { |
2a519311 JB |
631 | found->pub.beacon_interval = res->pub.beacon_interval; |
632 | found->pub.tsf = res->pub.tsf; | |
633 | found->pub.signal = res->pub.signal; | |
2a519311 JB |
634 | found->pub.capability = res->pub.capability; |
635 | found->ts = res->ts; | |
cd1658f5 | 636 | |
34a6eddb JM |
637 | /* Update IEs */ |
638 | if (res->pub.proberesp_ies) { | |
cd1658f5 | 639 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); |
34a6eddb JM |
640 | size_t ielen = res->pub.len_proberesp_ies; |
641 | ||
642 | if (found->pub.proberesp_ies && | |
643 | !found->proberesp_ies_allocated && | |
644 | ksize(found) >= used + ielen) { | |
645 | memcpy(found->pub.proberesp_ies, | |
646 | res->pub.proberesp_ies, ielen); | |
647 | found->pub.len_proberesp_ies = ielen; | |
648 | } else { | |
649 | u8 *ies = found->pub.proberesp_ies; | |
650 | ||
651 | if (found->proberesp_ies_allocated) | |
652 | ies = krealloc(ies, ielen, GFP_ATOMIC); | |
653 | else | |
654 | ies = kmalloc(ielen, GFP_ATOMIC); | |
655 | ||
656 | if (ies) { | |
657 | memcpy(ies, res->pub.proberesp_ies, | |
658 | ielen); | |
659 | found->proberesp_ies_allocated = true; | |
660 | found->pub.proberesp_ies = ies; | |
661 | found->pub.len_proberesp_ies = ielen; | |
662 | } | |
663 | } | |
cd1658f5 | 664 | |
34a6eddb JM |
665 | /* Override possible earlier Beacon frame IEs */ |
666 | found->pub.information_elements = | |
667 | found->pub.proberesp_ies; | |
668 | found->pub.len_information_elements = | |
669 | found->pub.len_proberesp_ies; | |
670 | } | |
671 | if (res->pub.beacon_ies) { | |
672 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); | |
673 | size_t ielen = res->pub.len_beacon_ies; | |
01123e23 SN |
674 | bool information_elements_is_beacon_ies = |
675 | (found->pub.information_elements == | |
676 | found->pub.beacon_ies); | |
34a6eddb JM |
677 | |
678 | if (found->pub.beacon_ies && | |
679 | !found->beacon_ies_allocated && | |
680 | ksize(found) >= used + ielen) { | |
681 | memcpy(found->pub.beacon_ies, | |
682 | res->pub.beacon_ies, ielen); | |
683 | found->pub.len_beacon_ies = ielen; | |
cd1658f5 | 684 | } else { |
34a6eddb | 685 | u8 *ies = found->pub.beacon_ies; |
cd1658f5 | 686 | |
34a6eddb | 687 | if (found->beacon_ies_allocated) |
273de92c MB |
688 | ies = krealloc(ies, ielen, GFP_ATOMIC); |
689 | else | |
cd1658f5 JB |
690 | ies = kmalloc(ielen, GFP_ATOMIC); |
691 | ||
692 | if (ies) { | |
34a6eddb JM |
693 | memcpy(ies, res->pub.beacon_ies, |
694 | ielen); | |
695 | found->beacon_ies_allocated = true; | |
696 | found->pub.beacon_ies = ies; | |
697 | found->pub.len_beacon_ies = ielen; | |
cd1658f5 JB |
698 | } |
699 | } | |
01123e23 SN |
700 | |
701 | /* Override IEs if they were from a beacon before */ | |
702 | if (information_elements_is_beacon_ies) { | |
703 | found->pub.information_elements = | |
704 | found->pub.beacon_ies; | |
705 | found->pub.len_information_elements = | |
706 | found->pub.len_beacon_ies; | |
707 | } | |
cd1658f5 JB |
708 | } |
709 | ||
2a519311 JB |
710 | kref_put(&res->ref, bss_release); |
711 | } else { | |
dd9dfb9f DT |
712 | struct cfg80211_internal_bss *hidden; |
713 | ||
714 | /* First check if the beacon is a probe response from | |
715 | * a hidden bss. If so, copy beacon ies (with nullified | |
716 | * ssid) into the probe response bss entry (with real ssid). | |
717 | * It is required basically for PSM implementation | |
718 | * (probe responses do not contain tim ie) */ | |
719 | ||
720 | /* TODO: The code is not trying to update existing probe | |
721 | * response bss entries when beacon ies are | |
722 | * getting changed. */ | |
723 | hidden = rb_find_hidden_bss(dev, res); | |
724 | if (hidden) | |
725 | copy_hidden_ies(res, hidden); | |
726 | ||
2a519311 JB |
727 | /* this "consumes" the reference */ |
728 | list_add_tail(&res->list, &dev->bss_list); | |
729 | rb_insert_bss(dev, res); | |
730 | found = res; | |
731 | } | |
732 | ||
733 | dev->bss_generation++; | |
734 | spin_unlock_bh(&dev->bss_lock); | |
735 | ||
736 | kref_get(&found->ref); | |
737 | return found; | |
738 | } | |
739 | ||
06aa7afa JK |
740 | struct cfg80211_bss* |
741 | cfg80211_inform_bss(struct wiphy *wiphy, | |
742 | struct ieee80211_channel *channel, | |
7b8bcff2 JB |
743 | const u8 *bssid, u64 tsf, u16 capability, |
744 | u16 beacon_interval, const u8 *ie, size_t ielen, | |
06aa7afa JK |
745 | s32 signal, gfp_t gfp) |
746 | { | |
747 | struct cfg80211_internal_bss *res; | |
748 | size_t privsz; | |
749 | ||
750 | if (WARN_ON(!wiphy)) | |
751 | return NULL; | |
752 | ||
753 | privsz = wiphy->bss_priv_size; | |
754 | ||
22fe88d3 | 755 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
06aa7afa JK |
756 | (signal < 0 || signal > 100))) |
757 | return NULL; | |
758 | ||
759 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
760 | if (!res) | |
761 | return NULL; | |
762 | ||
763 | memcpy(res->pub.bssid, bssid, ETH_ALEN); | |
764 | res->pub.channel = channel; | |
765 | res->pub.signal = signal; | |
7b8bcff2 | 766 | res->pub.tsf = tsf; |
06aa7afa JK |
767 | res->pub.beacon_interval = beacon_interval; |
768 | res->pub.capability = capability; | |
34a6eddb JM |
769 | /* |
770 | * Since we do not know here whether the IEs are from a Beacon or Probe | |
771 | * Response frame, we need to pick one of the options and only use it | |
772 | * with the driver that does not provide the full Beacon/Probe Response | |
773 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
774 | * override the information_elements pointer should we have received an | |
775 | * earlier indication of Probe Response data. | |
776 | * | |
777 | * The initial buffer for the IEs is allocated with the BSS entry and | |
778 | * is located after the private area. | |
779 | */ | |
780 | res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; | |
781 | memcpy(res->pub.beacon_ies, ie, ielen); | |
782 | res->pub.len_beacon_ies = ielen; | |
783 | res->pub.information_elements = res->pub.beacon_ies; | |
784 | res->pub.len_information_elements = res->pub.len_beacon_ies; | |
06aa7afa JK |
785 | |
786 | kref_init(&res->ref); | |
787 | ||
34a6eddb | 788 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); |
06aa7afa JK |
789 | if (!res) |
790 | return NULL; | |
791 | ||
792 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
793 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
794 | ||
795 | /* cfg80211_bss_update gives us a referenced result */ | |
796 | return &res->pub; | |
797 | } | |
798 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
799 | ||
2a519311 JB |
800 | struct cfg80211_bss * |
801 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
802 | struct ieee80211_channel *channel, | |
803 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 804 | s32 signal, gfp_t gfp) |
2a519311 JB |
805 | { |
806 | struct cfg80211_internal_bss *res; | |
807 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
808 | u.probe_resp.variable); | |
bef9bacc MK |
809 | size_t privsz; |
810 | ||
811 | if (WARN_ON(!mgmt)) | |
812 | return NULL; | |
813 | ||
814 | if (WARN_ON(!wiphy)) | |
815 | return NULL; | |
2a519311 | 816 | |
22fe88d3 | 817 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
2a519311 JB |
818 | (signal < 0 || signal > 100))) |
819 | return NULL; | |
820 | ||
bef9bacc | 821 | if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) |
2a519311 JB |
822 | return NULL; |
823 | ||
bef9bacc MK |
824 | privsz = wiphy->bss_priv_size; |
825 | ||
2a519311 JB |
826 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); |
827 | if (!res) | |
828 | return NULL; | |
829 | ||
830 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
831 | res->pub.channel = channel; | |
2a519311 JB |
832 | res->pub.signal = signal; |
833 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
834 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
835 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
34a6eddb JM |
836 | /* |
837 | * The initial buffer for the IEs is allocated with the BSS entry and | |
838 | * is located after the private area. | |
839 | */ | |
840 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { | |
841 | res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; | |
842 | memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, | |
843 | ielen); | |
844 | res->pub.len_proberesp_ies = ielen; | |
845 | res->pub.information_elements = res->pub.proberesp_ies; | |
846 | res->pub.len_information_elements = res->pub.len_proberesp_ies; | |
847 | } else { | |
848 | res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; | |
849 | memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); | |
850 | res->pub.len_beacon_ies = ielen; | |
851 | res->pub.information_elements = res->pub.beacon_ies; | |
852 | res->pub.len_information_elements = res->pub.len_beacon_ies; | |
853 | } | |
2a519311 JB |
854 | |
855 | kref_init(&res->ref); | |
856 | ||
34a6eddb | 857 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); |
2a519311 JB |
858 | if (!res) |
859 | return NULL; | |
860 | ||
e38f8a7a LR |
861 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
862 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
863 | ||
2a519311 JB |
864 | /* cfg80211_bss_update gives us a referenced result */ |
865 | return &res->pub; | |
866 | } | |
867 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
868 | ||
4c0c0b75 JB |
869 | void cfg80211_ref_bss(struct cfg80211_bss *pub) |
870 | { | |
871 | struct cfg80211_internal_bss *bss; | |
872 | ||
873 | if (!pub) | |
874 | return; | |
875 | ||
876 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
877 | kref_get(&bss->ref); | |
878 | } | |
879 | EXPORT_SYMBOL(cfg80211_ref_bss); | |
880 | ||
2a519311 JB |
881 | void cfg80211_put_bss(struct cfg80211_bss *pub) |
882 | { | |
883 | struct cfg80211_internal_bss *bss; | |
884 | ||
885 | if (!pub) | |
886 | return; | |
887 | ||
888 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
889 | kref_put(&bss->ref, bss_release); | |
890 | } | |
891 | EXPORT_SYMBOL(cfg80211_put_bss); | |
892 | ||
d491af19 JB |
893 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
894 | { | |
895 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
896 | struct cfg80211_internal_bss *bss; | |
897 | ||
898 | if (WARN_ON(!pub)) | |
899 | return; | |
900 | ||
901 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
902 | ||
903 | spin_lock_bh(&dev->bss_lock); | |
3207390a | 904 | if (!list_empty(&bss->list)) { |
2b78ac9b | 905 | __cfg80211_unlink_bss(dev, bss); |
3207390a | 906 | dev->bss_generation++; |
3207390a | 907 | } |
d491af19 | 908 | spin_unlock_bh(&dev->bss_lock); |
d491af19 JB |
909 | } |
910 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
911 | ||
3d23e349 | 912 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
913 | int cfg80211_wext_siwscan(struct net_device *dev, |
914 | struct iw_request_info *info, | |
915 | union iwreq_data *wrqu, char *extra) | |
916 | { | |
917 | struct cfg80211_registered_device *rdev; | |
918 | struct wiphy *wiphy; | |
919 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 920 | struct cfg80211_scan_request *creq = NULL; |
2a519311 JB |
921 | int i, err, n_channels = 0; |
922 | enum ieee80211_band band; | |
923 | ||
924 | if (!netif_running(dev)) | |
925 | return -ENETDOWN; | |
926 | ||
b2e3abdc HS |
927 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
928 | wreq = (struct iw_scan_req *)extra; | |
929 | ||
463d0183 | 930 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
931 | |
932 | if (IS_ERR(rdev)) | |
933 | return PTR_ERR(rdev); | |
934 | ||
935 | if (rdev->scan_req) { | |
936 | err = -EBUSY; | |
937 | goto out; | |
938 | } | |
939 | ||
940 | wiphy = &rdev->wiphy; | |
941 | ||
b2e3abdc HS |
942 | /* Determine number of channels, needed to allocate creq */ |
943 | if (wreq && wreq->num_channels) | |
944 | n_channels = wreq->num_channels; | |
945 | else { | |
946 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
947 | if (wiphy->bands[band]) | |
948 | n_channels += wiphy->bands[band]->n_channels; | |
949 | } | |
2a519311 JB |
950 | |
951 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
952 | n_channels * sizeof(void *), | |
953 | GFP_ATOMIC); | |
954 | if (!creq) { | |
955 | err = -ENOMEM; | |
956 | goto out; | |
957 | } | |
958 | ||
959 | creq->wiphy = wiphy; | |
fd014284 | 960 | creq->wdev = dev->ieee80211_ptr; |
5ba63533 JB |
961 | /* SSIDs come after channels */ |
962 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
963 | creq->n_channels = n_channels; |
964 | creq->n_ssids = 1; | |
965 | ||
b2e3abdc | 966 | /* translate "Scan on frequencies" request */ |
2a519311 JB |
967 | i = 0; |
968 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
969 | int j; | |
584991dc | 970 | |
2a519311 JB |
971 | if (!wiphy->bands[band]) |
972 | continue; | |
584991dc | 973 | |
2a519311 | 974 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
975 | /* ignore disabled channels */ |
976 | if (wiphy->bands[band]->channels[j].flags & | |
977 | IEEE80211_CHAN_DISABLED) | |
978 | continue; | |
b2e3abdc HS |
979 | |
980 | /* If we have a wireless request structure and the | |
981 | * wireless request specifies frequencies, then search | |
982 | * for the matching hardware channel. | |
983 | */ | |
984 | if (wreq && wreq->num_channels) { | |
985 | int k; | |
986 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
987 | for (k = 0; k < wreq->num_channels; k++) { | |
a4e7b730 | 988 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
b2e3abdc HS |
989 | if (wext_freq == wiphy_freq) |
990 | goto wext_freq_found; | |
991 | } | |
992 | goto wext_freq_not_found; | |
993 | } | |
994 | ||
995 | wext_freq_found: | |
2a519311 JB |
996 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
997 | i++; | |
b2e3abdc | 998 | wext_freq_not_found: ; |
2a519311 JB |
999 | } |
1000 | } | |
8862dc5f HS |
1001 | /* No channels found? */ |
1002 | if (!i) { | |
1003 | err = -EINVAL; | |
1004 | goto out; | |
1005 | } | |
2a519311 | 1006 | |
b2e3abdc HS |
1007 | /* Set real number of channels specified in creq->channels[] */ |
1008 | creq->n_channels = i; | |
2a519311 | 1009 | |
b2e3abdc HS |
1010 | /* translate "Scan for SSID" request */ |
1011 | if (wreq) { | |
2a519311 | 1012 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
1013 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
1014 | err = -EINVAL; | |
1015 | goto out; | |
1016 | } | |
2a519311 JB |
1017 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
1018 | creq->ssids[0].ssid_len = wreq->essid_len; | |
1019 | } | |
1020 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
1021 | creq->n_ssids = 0; | |
1022 | } | |
1023 | ||
34850ab2 | 1024 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) |
a401d2bb JB |
1025 | if (wiphy->bands[i]) |
1026 | creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; | |
34850ab2 | 1027 | |
2a519311 | 1028 | rdev->scan_req = creq; |
fd014284 | 1029 | err = rdev->ops->scan(wiphy, creq); |
2a519311 JB |
1030 | if (err) { |
1031 | rdev->scan_req = NULL; | |
65486c8b | 1032 | /* creq will be freed below */ |
463d0183 | 1033 | } else { |
fd014284 | 1034 | nl80211_send_scan_start(rdev, dev->ieee80211_ptr); |
65486c8b JB |
1035 | /* creq now owned by driver */ |
1036 | creq = NULL; | |
463d0183 JB |
1037 | dev_hold(dev); |
1038 | } | |
2a519311 | 1039 | out: |
65486c8b | 1040 | kfree(creq); |
4d0c8aea | 1041 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1042 | return err; |
1043 | } | |
ba44cb72 | 1044 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
1045 | |
1046 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
1047 | struct cfg80211_bss *bss, | |
1048 | char **current_ev, char *end_buf) | |
1049 | { | |
1050 | u8 *pos, *end, *next; | |
1051 | struct iw_event iwe; | |
1052 | ||
1053 | if (!bss->information_elements || | |
1054 | !bss->len_information_elements) | |
1055 | return; | |
1056 | ||
1057 | /* | |
1058 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
1059 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
1060 | */ | |
1061 | pos = bss->information_elements; | |
1062 | end = pos + bss->len_information_elements; | |
1063 | ||
1064 | while (end - pos > IW_GENERIC_IE_MAX) { | |
1065 | next = pos + 2 + pos[1]; | |
1066 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
1067 | next = next + 2 + next[1]; | |
1068 | ||
1069 | memset(&iwe, 0, sizeof(iwe)); | |
1070 | iwe.cmd = IWEVGENIE; | |
1071 | iwe.u.data.length = next - pos; | |
1072 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
1073 | end_buf, &iwe, pos); | |
1074 | ||
1075 | pos = next; | |
1076 | } | |
1077 | ||
1078 | if (end > pos) { | |
1079 | memset(&iwe, 0, sizeof(iwe)); | |
1080 | iwe.cmd = IWEVGENIE; | |
1081 | iwe.u.data.length = end - pos; | |
1082 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
1083 | end_buf, &iwe, pos); | |
1084 | } | |
1085 | } | |
1086 | ||
cb3a8eec DW |
1087 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
1088 | { | |
1089 | unsigned long end = jiffies; | |
1090 | ||
1091 | if (end >= start) | |
1092 | return jiffies_to_msecs(end - start); | |
1093 | ||
1094 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
1095 | } | |
2a519311 JB |
1096 | |
1097 | static char * | |
77965c97 JB |
1098 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
1099 | struct cfg80211_internal_bss *bss, char *current_ev, | |
1100 | char *end_buf) | |
2a519311 JB |
1101 | { |
1102 | struct iw_event iwe; | |
1103 | u8 *buf, *cfg, *p; | |
1104 | u8 *ie = bss->pub.information_elements; | |
a77b8552 | 1105 | int rem = bss->pub.len_information_elements, i, sig; |
2a519311 JB |
1106 | bool ismesh = false; |
1107 | ||
1108 | memset(&iwe, 0, sizeof(iwe)); | |
1109 | iwe.cmd = SIOCGIWAP; | |
1110 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
1111 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
1112 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1113 | IW_EV_ADDR_LEN); | |
1114 | ||
1115 | memset(&iwe, 0, sizeof(iwe)); | |
1116 | iwe.cmd = SIOCGIWFREQ; | |
1117 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
1118 | iwe.u.freq.e = 0; | |
1119 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1120 | IW_EV_FREQ_LEN); | |
1121 | ||
1122 | memset(&iwe, 0, sizeof(iwe)); | |
1123 | iwe.cmd = SIOCGIWFREQ; | |
1124 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
1125 | iwe.u.freq.e = 6; | |
1126 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
1127 | IW_EV_FREQ_LEN); | |
1128 | ||
77965c97 | 1129 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
1130 | memset(&iwe, 0, sizeof(iwe)); |
1131 | iwe.cmd = IWEVQUAL; | |
1132 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
1133 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 1134 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 1135 | switch (wiphy->signal_type) { |
2a519311 | 1136 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
1137 | sig = bss->pub.signal / 100; |
1138 | iwe.u.qual.level = sig; | |
2a519311 | 1139 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
1140 | if (sig < -110) /* rather bad */ |
1141 | sig = -110; | |
1142 | else if (sig > -40) /* perfect */ | |
1143 | sig = -40; | |
1144 | /* will give a range of 0 .. 70 */ | |
1145 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
1146 | break; |
1147 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
1148 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
1149 | /* will give range 0 .. 100 */ |
1150 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
1151 | break; |
1152 | default: | |
1153 | /* not reached */ | |
1154 | break; | |
1155 | } | |
1156 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1157 | &iwe, IW_EV_QUAL_LEN); | |
1158 | } | |
1159 | ||
1160 | memset(&iwe, 0, sizeof(iwe)); | |
1161 | iwe.cmd = SIOCGIWENCODE; | |
1162 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
1163 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
1164 | else | |
1165 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
1166 | iwe.u.data.length = 0; | |
1167 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1168 | &iwe, ""); | |
1169 | ||
1170 | while (rem >= 2) { | |
1171 | /* invalid data */ | |
1172 | if (ie[1] > rem - 2) | |
1173 | break; | |
1174 | ||
1175 | switch (ie[0]) { | |
1176 | case WLAN_EID_SSID: | |
1177 | memset(&iwe, 0, sizeof(iwe)); | |
1178 | iwe.cmd = SIOCGIWESSID; | |
1179 | iwe.u.data.length = ie[1]; | |
1180 | iwe.u.data.flags = 1; | |
1181 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1182 | &iwe, ie + 2); | |
1183 | break; | |
1184 | case WLAN_EID_MESH_ID: | |
1185 | memset(&iwe, 0, sizeof(iwe)); | |
1186 | iwe.cmd = SIOCGIWESSID; | |
1187 | iwe.u.data.length = ie[1]; | |
1188 | iwe.u.data.flags = 1; | |
1189 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1190 | &iwe, ie + 2); | |
1191 | break; | |
1192 | case WLAN_EID_MESH_CONFIG: | |
1193 | ismesh = true; | |
136cfa28 | 1194 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
1195 | break; |
1196 | buf = kmalloc(50, GFP_ATOMIC); | |
1197 | if (!buf) | |
1198 | break; | |
1199 | cfg = ie + 2; | |
1200 | memset(&iwe, 0, sizeof(iwe)); | |
1201 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
1202 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
1203 | "0x%02X", cfg[0]); | |
2a519311 JB |
1204 | iwe.u.data.length = strlen(buf); |
1205 | current_ev = iwe_stream_add_point(info, current_ev, | |
1206 | end_buf, | |
1207 | &iwe, buf); | |
76aa5e70 RP |
1208 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
1209 | cfg[1]); | |
2a519311 JB |
1210 | iwe.u.data.length = strlen(buf); |
1211 | current_ev = iwe_stream_add_point(info, current_ev, | |
1212 | end_buf, | |
1213 | &iwe, buf); | |
76aa5e70 RP |
1214 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
1215 | cfg[2]); | |
2a519311 JB |
1216 | iwe.u.data.length = strlen(buf); |
1217 | current_ev = iwe_stream_add_point(info, current_ev, | |
1218 | end_buf, | |
1219 | &iwe, buf); | |
76aa5e70 | 1220 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 JB |
1221 | iwe.u.data.length = strlen(buf); |
1222 | current_ev = iwe_stream_add_point(info, current_ev, | |
1223 | end_buf, | |
1224 | &iwe, buf); | |
76aa5e70 RP |
1225 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
1226 | iwe.u.data.length = strlen(buf); | |
1227 | current_ev = iwe_stream_add_point(info, current_ev, | |
1228 | end_buf, | |
1229 | &iwe, buf); | |
1230 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); | |
1231 | iwe.u.data.length = strlen(buf); | |
1232 | current_ev = iwe_stream_add_point(info, current_ev, | |
1233 | end_buf, | |
1234 | &iwe, buf); | |
1235 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); | |
2a519311 JB |
1236 | iwe.u.data.length = strlen(buf); |
1237 | current_ev = iwe_stream_add_point(info, current_ev, | |
1238 | end_buf, | |
1239 | &iwe, buf); | |
1240 | kfree(buf); | |
1241 | break; | |
1242 | case WLAN_EID_SUPP_RATES: | |
1243 | case WLAN_EID_EXT_SUPP_RATES: | |
1244 | /* display all supported rates in readable format */ | |
1245 | p = current_ev + iwe_stream_lcp_len(info); | |
1246 | ||
1247 | memset(&iwe, 0, sizeof(iwe)); | |
1248 | iwe.cmd = SIOCGIWRATE; | |
1249 | /* Those two flags are ignored... */ | |
1250 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
1251 | ||
1252 | for (i = 0; i < ie[1]; i++) { | |
1253 | iwe.u.bitrate.value = | |
1254 | ((ie[i + 2] & 0x7f) * 500000); | |
1255 | p = iwe_stream_add_value(info, current_ev, p, | |
1256 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
1257 | } | |
1258 | current_ev = p; | |
1259 | break; | |
1260 | } | |
1261 | rem -= ie[1] + 2; | |
1262 | ie += ie[1] + 2; | |
1263 | } | |
1264 | ||
f64f9e71 JP |
1265 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1266 | ismesh) { | |
2a519311 JB |
1267 | memset(&iwe, 0, sizeof(iwe)); |
1268 | iwe.cmd = SIOCGIWMODE; | |
1269 | if (ismesh) | |
1270 | iwe.u.mode = IW_MODE_MESH; | |
1271 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1272 | iwe.u.mode = IW_MODE_MASTER; | |
1273 | else | |
1274 | iwe.u.mode = IW_MODE_ADHOC; | |
1275 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1276 | &iwe, IW_EV_UINT_LEN); | |
1277 | } | |
1278 | ||
1279 | buf = kmalloc(30, GFP_ATOMIC); | |
1280 | if (buf) { | |
1281 | memset(&iwe, 0, sizeof(iwe)); | |
1282 | iwe.cmd = IWEVCUSTOM; | |
1283 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
1284 | iwe.u.data.length = strlen(buf); | |
1285 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1286 | &iwe, buf); | |
1287 | memset(&iwe, 0, sizeof(iwe)); | |
1288 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
1289 | sprintf(buf, " Last beacon: %ums ago", |
1290 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
1291 | iwe.u.data.length = strlen(buf); |
1292 | current_ev = iwe_stream_add_point(info, current_ev, | |
1293 | end_buf, &iwe, buf); | |
1294 | kfree(buf); | |
1295 | } | |
1296 | ||
1297 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
1298 | ||
1299 | return current_ev; | |
1300 | } | |
1301 | ||
1302 | ||
1303 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
1304 | struct iw_request_info *info, | |
1305 | char *buf, size_t len) | |
1306 | { | |
1307 | char *current_ev = buf; | |
1308 | char *end_buf = buf + len; | |
1309 | struct cfg80211_internal_bss *bss; | |
1310 | ||
1311 | spin_lock_bh(&dev->bss_lock); | |
1312 | cfg80211_bss_expire(dev); | |
1313 | ||
1314 | list_for_each_entry(bss, &dev->bss_list, list) { | |
1315 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
1316 | spin_unlock_bh(&dev->bss_lock); | |
1317 | return -E2BIG; | |
1318 | } | |
77965c97 JB |
1319 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
1320 | current_ev, end_buf); | |
2a519311 JB |
1321 | } |
1322 | spin_unlock_bh(&dev->bss_lock); | |
1323 | return current_ev - buf; | |
1324 | } | |
1325 | ||
1326 | ||
1327 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1328 | struct iw_request_info *info, | |
1329 | struct iw_point *data, char *extra) | |
1330 | { | |
1331 | struct cfg80211_registered_device *rdev; | |
1332 | int res; | |
1333 | ||
1334 | if (!netif_running(dev)) | |
1335 | return -ENETDOWN; | |
1336 | ||
463d0183 | 1337 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1338 | |
1339 | if (IS_ERR(rdev)) | |
1340 | return PTR_ERR(rdev); | |
1341 | ||
1342 | if (rdev->scan_req) { | |
1343 | res = -EAGAIN; | |
1344 | goto out; | |
1345 | } | |
1346 | ||
1347 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1348 | data->length = 0; | |
1349 | if (res >= 0) { | |
1350 | data->length = res; | |
1351 | res = 0; | |
1352 | } | |
1353 | ||
1354 | out: | |
4d0c8aea | 1355 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1356 | return res; |
1357 | } | |
ba44cb72 | 1358 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 1359 | #endif |