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> | |
7 | #include <linux/module.h> | |
8 | #include <linux/netdevice.h> | |
9 | #include <linux/wireless.h> | |
10 | #include <linux/nl80211.h> | |
11 | #include <linux/etherdevice.h> | |
12 | #include <net/arp.h> | |
13 | #include <net/cfg80211.h> | |
14 | #include <net/iw_handler.h> | |
15 | #include "core.h" | |
16 | #include "nl80211.h" | |
a9a11622 | 17 | #include "wext-compat.h" |
2a519311 | 18 | |
09f97e0f | 19 | #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ) |
2a519311 | 20 | |
01a0ac41 | 21 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) |
2a519311 | 22 | { |
667503dd | 23 | struct cfg80211_scan_request *request; |
2a519311 | 24 | struct net_device *dev; |
3d23e349 | 25 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
26 | union iwreq_data wrqu; |
27 | #endif | |
28 | ||
01a0ac41 JB |
29 | ASSERT_RDEV_LOCK(rdev); |
30 | ||
667503dd JB |
31 | request = rdev->scan_req; |
32 | ||
01a0ac41 JB |
33 | if (!request) |
34 | return; | |
35 | ||
463d0183 | 36 | dev = request->dev; |
2a519311 | 37 | |
6829c878 JB |
38 | /* |
39 | * This must be before sending the other events! | |
40 | * Otherwise, wpa_supplicant gets completely confused with | |
41 | * wext events. | |
42 | */ | |
43 | cfg80211_sme_scan_done(dev); | |
44 | ||
667503dd | 45 | if (request->aborted) |
36e6fea8 | 46 | nl80211_send_scan_aborted(rdev, dev); |
2a519311 | 47 | else |
36e6fea8 | 48 | nl80211_send_scan_done(rdev, dev); |
2a519311 | 49 | |
3d23e349 | 50 | #ifdef CONFIG_CFG80211_WEXT |
667503dd | 51 | if (!request->aborted) { |
2a519311 JB |
52 | memset(&wrqu, 0, sizeof(wrqu)); |
53 | ||
54 | wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); | |
55 | } | |
56 | #endif | |
57 | ||
58 | dev_put(dev); | |
59 | ||
36e6fea8 | 60 | rdev->scan_req = NULL; |
01a0ac41 JB |
61 | |
62 | /* | |
63 | * OK. If this is invoked with "leak" then we can't | |
64 | * free this ... but we've cleaned it up anyway. The | |
65 | * driver failed to call the scan_done callback, so | |
66 | * all bets are off, it might still be trying to use | |
67 | * the scan request or not ... if it accesses the dev | |
68 | * in there (it shouldn't anyway) then it may crash. | |
69 | */ | |
70 | if (!leak) | |
71 | kfree(request); | |
2a519311 | 72 | } |
667503dd | 73 | |
36e6fea8 JB |
74 | void __cfg80211_scan_done(struct work_struct *wk) |
75 | { | |
76 | struct cfg80211_registered_device *rdev; | |
77 | ||
78 | rdev = container_of(wk, struct cfg80211_registered_device, | |
79 | scan_done_wk); | |
80 | ||
81 | cfg80211_lock_rdev(rdev); | |
01a0ac41 | 82 | ___cfg80211_scan_done(rdev, false); |
36e6fea8 JB |
83 | cfg80211_unlock_rdev(rdev); |
84 | } | |
85 | ||
667503dd JB |
86 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
87 | { | |
667503dd JB |
88 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
89 | ||
90 | request->aborted = aborted; | |
e60d7443 | 91 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
667503dd | 92 | } |
2a519311 JB |
93 | EXPORT_SYMBOL(cfg80211_scan_done); |
94 | ||
95 | static void bss_release(struct kref *ref) | |
96 | { | |
97 | struct cfg80211_internal_bss *bss; | |
98 | ||
99 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
78c1c7e1 JB |
100 | if (bss->pub.free_priv) |
101 | bss->pub.free_priv(&bss->pub); | |
cd1658f5 | 102 | |
34a6eddb JM |
103 | if (bss->beacon_ies_allocated) |
104 | kfree(bss->pub.beacon_ies); | |
105 | if (bss->proberesp_ies_allocated) | |
106 | kfree(bss->pub.proberesp_ies); | |
cd1658f5 | 107 | |
19957bb3 JB |
108 | BUG_ON(atomic_read(&bss->hold)); |
109 | ||
2a519311 JB |
110 | kfree(bss); |
111 | } | |
112 | ||
cb3a8eec DW |
113 | /* must hold dev->bss_lock! */ |
114 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
115 | unsigned long age_secs) | |
116 | { | |
117 | struct cfg80211_internal_bss *bss; | |
118 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
119 | ||
120 | list_for_each_entry(bss, &dev->bss_list, list) { | |
121 | bss->ts -= age_jiffies; | |
122 | } | |
123 | } | |
124 | ||
2a519311 JB |
125 | /* must hold dev->bss_lock! */ |
126 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
127 | { | |
128 | struct cfg80211_internal_bss *bss, *tmp; | |
129 | bool expired = false; | |
130 | ||
131 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
19957bb3 JB |
132 | if (atomic_read(&bss->hold)) |
133 | continue; | |
134 | if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
2a519311 JB |
135 | continue; |
136 | list_del(&bss->list); | |
137 | rb_erase(&bss->rbn, &dev->bss_tree); | |
138 | kref_put(&bss->ref, bss_release); | |
139 | expired = true; | |
140 | } | |
141 | ||
142 | if (expired) | |
143 | dev->bss_generation++; | |
144 | } | |
145 | ||
c21dbf92 | 146 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
2a519311 | 147 | { |
c21dbf92 | 148 | while (len > 2 && ies[0] != eid) { |
2a519311 JB |
149 | len -= ies[1] + 2; |
150 | ies += ies[1] + 2; | |
151 | } | |
152 | if (len < 2) | |
153 | return NULL; | |
154 | if (len < 2 + ies[1]) | |
155 | return NULL; | |
156 | return ies; | |
157 | } | |
c21dbf92 | 158 | EXPORT_SYMBOL(cfg80211_find_ie); |
2a519311 JB |
159 | |
160 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) | |
161 | { | |
c21dbf92 JB |
162 | const u8 *ie1 = cfg80211_find_ie(num, ies1, len1); |
163 | const u8 *ie2 = cfg80211_find_ie(num, ies2, len2); | |
2a519311 JB |
164 | int r; |
165 | ||
166 | if (!ie1 && !ie2) | |
167 | return 0; | |
cd3468ba | 168 | if (!ie1 || !ie2) |
2a519311 JB |
169 | return -1; |
170 | ||
171 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); | |
172 | if (r == 0 && ie1[1] != ie2[1]) | |
173 | return ie2[1] - ie1[1]; | |
174 | return r; | |
175 | } | |
176 | ||
177 | static bool is_bss(struct cfg80211_bss *a, | |
178 | const u8 *bssid, | |
179 | const u8 *ssid, size_t ssid_len) | |
180 | { | |
181 | const u8 *ssidie; | |
182 | ||
79420f09 | 183 | if (bssid && compare_ether_addr(a->bssid, bssid)) |
2a519311 JB |
184 | return false; |
185 | ||
79420f09 JB |
186 | if (!ssid) |
187 | return true; | |
188 | ||
c21dbf92 JB |
189 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, |
190 | a->information_elements, | |
191 | a->len_information_elements); | |
2a519311 JB |
192 | if (!ssidie) |
193 | return false; | |
194 | if (ssidie[1] != ssid_len) | |
195 | return false; | |
196 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
197 | } | |
198 | ||
199 | static bool is_mesh(struct cfg80211_bss *a, | |
200 | const u8 *meshid, size_t meshidlen, | |
201 | const u8 *meshcfg) | |
202 | { | |
203 | const u8 *ie; | |
204 | ||
205 | if (!is_zero_ether_addr(a->bssid)) | |
206 | return false; | |
207 | ||
c21dbf92 JB |
208 | ie = cfg80211_find_ie(WLAN_EID_MESH_ID, |
209 | a->information_elements, | |
210 | a->len_information_elements); | |
2a519311 JB |
211 | if (!ie) |
212 | return false; | |
213 | if (ie[1] != meshidlen) | |
214 | return false; | |
215 | if (memcmp(ie + 2, meshid, meshidlen)) | |
216 | return false; | |
217 | ||
c21dbf92 JB |
218 | ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
219 | a->information_elements, | |
220 | a->len_information_elements); | |
cd3468ba JB |
221 | if (!ie) |
222 | return false; | |
136cfa28 | 223 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
224 | return false; |
225 | ||
226 | /* | |
227 | * Ignore mesh capability (last two bytes of the IE) when | |
228 | * comparing since that may differ between stations taking | |
229 | * part in the same mesh. | |
230 | */ | |
136cfa28 RP |
231 | return memcmp(ie + 2, meshcfg, |
232 | sizeof(struct ieee80211_meshconf_ie) - 2) == 0; | |
2a519311 JB |
233 | } |
234 | ||
235 | static int cmp_bss(struct cfg80211_bss *a, | |
236 | struct cfg80211_bss *b) | |
237 | { | |
238 | int r; | |
239 | ||
240 | if (a->channel != b->channel) | |
241 | return b->channel->center_freq - a->channel->center_freq; | |
242 | ||
243 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
244 | if (r) | |
245 | return r; | |
246 | ||
247 | if (is_zero_ether_addr(a->bssid)) { | |
248 | r = cmp_ies(WLAN_EID_MESH_ID, | |
249 | a->information_elements, | |
250 | a->len_information_elements, | |
251 | b->information_elements, | |
252 | b->len_information_elements); | |
253 | if (r) | |
254 | return r; | |
255 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
256 | a->information_elements, | |
257 | a->len_information_elements, | |
258 | b->information_elements, | |
259 | b->len_information_elements); | |
260 | } | |
261 | ||
262 | return cmp_ies(WLAN_EID_SSID, | |
263 | a->information_elements, | |
264 | a->len_information_elements, | |
265 | b->information_elements, | |
266 | b->len_information_elements); | |
267 | } | |
268 | ||
269 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
270 | struct ieee80211_channel *channel, | |
271 | const u8 *bssid, | |
79420f09 JB |
272 | const u8 *ssid, size_t ssid_len, |
273 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
274 | { |
275 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
276 | struct cfg80211_internal_bss *bss, *res = NULL; | |
277 | ||
278 | spin_lock_bh(&dev->bss_lock); | |
279 | ||
280 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
281 | if ((bss->pub.capability & capa_mask) != capa_val) |
282 | continue; | |
2a519311 JB |
283 | if (channel && bss->pub.channel != channel) |
284 | continue; | |
285 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { | |
286 | res = bss; | |
287 | kref_get(&res->ref); | |
288 | break; | |
289 | } | |
290 | } | |
291 | ||
292 | spin_unlock_bh(&dev->bss_lock); | |
293 | if (!res) | |
294 | return NULL; | |
295 | return &res->pub; | |
296 | } | |
297 | EXPORT_SYMBOL(cfg80211_get_bss); | |
298 | ||
299 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
300 | struct ieee80211_channel *channel, | |
301 | const u8 *meshid, size_t meshidlen, | |
302 | const u8 *meshcfg) | |
303 | { | |
304 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
305 | struct cfg80211_internal_bss *bss, *res = NULL; | |
306 | ||
307 | spin_lock_bh(&dev->bss_lock); | |
308 | ||
309 | list_for_each_entry(bss, &dev->bss_list, list) { | |
310 | if (channel && bss->pub.channel != channel) | |
311 | continue; | |
312 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
313 | res = bss; | |
314 | kref_get(&res->ref); | |
315 | break; | |
316 | } | |
317 | } | |
318 | ||
319 | spin_unlock_bh(&dev->bss_lock); | |
320 | if (!res) | |
321 | return NULL; | |
322 | return &res->pub; | |
323 | } | |
324 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
325 | ||
326 | ||
327 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
328 | struct cfg80211_internal_bss *bss) | |
329 | { | |
330 | struct rb_node **p = &dev->bss_tree.rb_node; | |
331 | struct rb_node *parent = NULL; | |
332 | struct cfg80211_internal_bss *tbss; | |
333 | int cmp; | |
334 | ||
335 | while (*p) { | |
336 | parent = *p; | |
337 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
338 | ||
339 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
340 | ||
341 | if (WARN_ON(!cmp)) { | |
342 | /* will sort of leak this BSS */ | |
343 | return; | |
344 | } | |
345 | ||
346 | if (cmp < 0) | |
347 | p = &(*p)->rb_left; | |
348 | else | |
349 | p = &(*p)->rb_right; | |
350 | } | |
351 | ||
352 | rb_link_node(&bss->rbn, parent, p); | |
353 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
354 | } | |
355 | ||
356 | static struct cfg80211_internal_bss * | |
357 | rb_find_bss(struct cfg80211_registered_device *dev, | |
358 | struct cfg80211_internal_bss *res) | |
359 | { | |
360 | struct rb_node *n = dev->bss_tree.rb_node; | |
361 | struct cfg80211_internal_bss *bss; | |
362 | int r; | |
363 | ||
364 | while (n) { | |
365 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
366 | r = cmp_bss(&res->pub, &bss->pub); | |
367 | ||
368 | if (r == 0) | |
369 | return bss; | |
370 | else if (r < 0) | |
371 | n = n->rb_left; | |
372 | else | |
373 | n = n->rb_right; | |
374 | } | |
375 | ||
376 | return NULL; | |
377 | } | |
378 | ||
379 | static struct cfg80211_internal_bss * | |
380 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
34a6eddb | 381 | struct cfg80211_internal_bss *res) |
2a519311 JB |
382 | { |
383 | struct cfg80211_internal_bss *found = NULL; | |
384 | const u8 *meshid, *meshcfg; | |
385 | ||
386 | /* | |
387 | * The reference to "res" is donated to this function. | |
388 | */ | |
389 | ||
390 | if (WARN_ON(!res->pub.channel)) { | |
391 | kref_put(&res->ref, bss_release); | |
392 | return NULL; | |
393 | } | |
394 | ||
395 | res->ts = jiffies; | |
396 | ||
397 | if (is_zero_ether_addr(res->pub.bssid)) { | |
398 | /* must be mesh, verify */ | |
c21dbf92 JB |
399 | meshid = cfg80211_find_ie(WLAN_EID_MESH_ID, |
400 | res->pub.information_elements, | |
401 | res->pub.len_information_elements); | |
402 | meshcfg = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
403 | res->pub.information_elements, | |
404 | res->pub.len_information_elements); | |
2a519311 | 405 | if (!meshid || !meshcfg || |
136cfa28 | 406 | meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) { |
2a519311 JB |
407 | /* bogus mesh */ |
408 | kref_put(&res->ref, bss_release); | |
409 | return NULL; | |
410 | } | |
411 | } | |
412 | ||
413 | spin_lock_bh(&dev->bss_lock); | |
414 | ||
415 | found = rb_find_bss(dev, res); | |
416 | ||
cd1658f5 | 417 | if (found) { |
2a519311 JB |
418 | found->pub.beacon_interval = res->pub.beacon_interval; |
419 | found->pub.tsf = res->pub.tsf; | |
420 | found->pub.signal = res->pub.signal; | |
2a519311 JB |
421 | found->pub.capability = res->pub.capability; |
422 | found->ts = res->ts; | |
cd1658f5 | 423 | |
34a6eddb JM |
424 | /* Update IEs */ |
425 | if (res->pub.proberesp_ies) { | |
cd1658f5 | 426 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); |
34a6eddb JM |
427 | size_t ielen = res->pub.len_proberesp_ies; |
428 | ||
429 | if (found->pub.proberesp_ies && | |
430 | !found->proberesp_ies_allocated && | |
431 | ksize(found) >= used + ielen) { | |
432 | memcpy(found->pub.proberesp_ies, | |
433 | res->pub.proberesp_ies, ielen); | |
434 | found->pub.len_proberesp_ies = ielen; | |
435 | } else { | |
436 | u8 *ies = found->pub.proberesp_ies; | |
437 | ||
438 | if (found->proberesp_ies_allocated) | |
439 | ies = krealloc(ies, ielen, GFP_ATOMIC); | |
440 | else | |
441 | ies = kmalloc(ielen, GFP_ATOMIC); | |
442 | ||
443 | if (ies) { | |
444 | memcpy(ies, res->pub.proberesp_ies, | |
445 | ielen); | |
446 | found->proberesp_ies_allocated = true; | |
447 | found->pub.proberesp_ies = ies; | |
448 | found->pub.len_proberesp_ies = ielen; | |
449 | } | |
450 | } | |
cd1658f5 | 451 | |
34a6eddb JM |
452 | /* Override possible earlier Beacon frame IEs */ |
453 | found->pub.information_elements = | |
454 | found->pub.proberesp_ies; | |
455 | found->pub.len_information_elements = | |
456 | found->pub.len_proberesp_ies; | |
457 | } | |
458 | if (res->pub.beacon_ies) { | |
459 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); | |
460 | size_t ielen = res->pub.len_beacon_ies; | |
461 | ||
462 | if (found->pub.beacon_ies && | |
463 | !found->beacon_ies_allocated && | |
464 | ksize(found) >= used + ielen) { | |
465 | memcpy(found->pub.beacon_ies, | |
466 | res->pub.beacon_ies, ielen); | |
467 | found->pub.len_beacon_ies = ielen; | |
cd1658f5 | 468 | } else { |
34a6eddb | 469 | u8 *ies = found->pub.beacon_ies; |
cd1658f5 | 470 | |
34a6eddb | 471 | if (found->beacon_ies_allocated) |
273de92c MB |
472 | ies = krealloc(ies, ielen, GFP_ATOMIC); |
473 | else | |
cd1658f5 JB |
474 | ies = kmalloc(ielen, GFP_ATOMIC); |
475 | ||
476 | if (ies) { | |
34a6eddb JM |
477 | memcpy(ies, res->pub.beacon_ies, |
478 | ielen); | |
479 | found->beacon_ies_allocated = true; | |
480 | found->pub.beacon_ies = ies; | |
481 | found->pub.len_beacon_ies = ielen; | |
cd1658f5 JB |
482 | } |
483 | } | |
484 | } | |
485 | ||
2a519311 JB |
486 | kref_put(&res->ref, bss_release); |
487 | } else { | |
488 | /* this "consumes" the reference */ | |
489 | list_add_tail(&res->list, &dev->bss_list); | |
490 | rb_insert_bss(dev, res); | |
491 | found = res; | |
492 | } | |
493 | ||
494 | dev->bss_generation++; | |
495 | spin_unlock_bh(&dev->bss_lock); | |
496 | ||
497 | kref_get(&found->ref); | |
498 | return found; | |
499 | } | |
500 | ||
06aa7afa JK |
501 | struct cfg80211_bss* |
502 | cfg80211_inform_bss(struct wiphy *wiphy, | |
503 | struct ieee80211_channel *channel, | |
504 | const u8 *bssid, | |
505 | u64 timestamp, u16 capability, u16 beacon_interval, | |
506 | const u8 *ie, size_t ielen, | |
507 | s32 signal, gfp_t gfp) | |
508 | { | |
509 | struct cfg80211_internal_bss *res; | |
510 | size_t privsz; | |
511 | ||
512 | if (WARN_ON(!wiphy)) | |
513 | return NULL; | |
514 | ||
515 | privsz = wiphy->bss_priv_size; | |
516 | ||
517 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && | |
518 | (signal < 0 || signal > 100))) | |
519 | return NULL; | |
520 | ||
521 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
522 | if (!res) | |
523 | return NULL; | |
524 | ||
525 | memcpy(res->pub.bssid, bssid, ETH_ALEN); | |
526 | res->pub.channel = channel; | |
527 | res->pub.signal = signal; | |
528 | res->pub.tsf = timestamp; | |
529 | res->pub.beacon_interval = beacon_interval; | |
530 | res->pub.capability = capability; | |
34a6eddb JM |
531 | /* |
532 | * Since we do not know here whether the IEs are from a Beacon or Probe | |
533 | * Response frame, we need to pick one of the options and only use it | |
534 | * with the driver that does not provide the full Beacon/Probe Response | |
535 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
536 | * override the information_elements pointer should we have received an | |
537 | * earlier indication of Probe Response data. | |
538 | * | |
539 | * The initial buffer for the IEs is allocated with the BSS entry and | |
540 | * is located after the private area. | |
541 | */ | |
542 | res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; | |
543 | memcpy(res->pub.beacon_ies, ie, ielen); | |
544 | res->pub.len_beacon_ies = ielen; | |
545 | res->pub.information_elements = res->pub.beacon_ies; | |
546 | res->pub.len_information_elements = res->pub.len_beacon_ies; | |
06aa7afa JK |
547 | |
548 | kref_init(&res->ref); | |
549 | ||
34a6eddb | 550 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); |
06aa7afa JK |
551 | if (!res) |
552 | return NULL; | |
553 | ||
554 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
555 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
556 | ||
557 | /* cfg80211_bss_update gives us a referenced result */ | |
558 | return &res->pub; | |
559 | } | |
560 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
561 | ||
2a519311 JB |
562 | struct cfg80211_bss * |
563 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
564 | struct ieee80211_channel *channel, | |
565 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 566 | s32 signal, gfp_t gfp) |
2a519311 JB |
567 | { |
568 | struct cfg80211_internal_bss *res; | |
569 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
570 | u.probe_resp.variable); | |
2a519311 JB |
571 | size_t privsz = wiphy->bss_priv_size; |
572 | ||
77965c97 | 573 | if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC && |
2a519311 JB |
574 | (signal < 0 || signal > 100))) |
575 | return NULL; | |
576 | ||
577 | if (WARN_ON(!mgmt || !wiphy || | |
578 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
579 | return NULL; | |
580 | ||
581 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
582 | if (!res) | |
583 | return NULL; | |
584 | ||
585 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
586 | res->pub.channel = channel; | |
2a519311 JB |
587 | res->pub.signal = signal; |
588 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
589 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
590 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
34a6eddb JM |
591 | /* |
592 | * The initial buffer for the IEs is allocated with the BSS entry and | |
593 | * is located after the private area. | |
594 | */ | |
595 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { | |
596 | res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; | |
597 | memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, | |
598 | ielen); | |
599 | res->pub.len_proberesp_ies = ielen; | |
600 | res->pub.information_elements = res->pub.proberesp_ies; | |
601 | res->pub.len_information_elements = res->pub.len_proberesp_ies; | |
602 | } else { | |
603 | res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; | |
604 | memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); | |
605 | res->pub.len_beacon_ies = ielen; | |
606 | res->pub.information_elements = res->pub.beacon_ies; | |
607 | res->pub.len_information_elements = res->pub.len_beacon_ies; | |
608 | } | |
2a519311 JB |
609 | |
610 | kref_init(&res->ref); | |
611 | ||
34a6eddb | 612 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); |
2a519311 JB |
613 | if (!res) |
614 | return NULL; | |
615 | ||
e38f8a7a LR |
616 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
617 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
618 | ||
2a519311 JB |
619 | /* cfg80211_bss_update gives us a referenced result */ |
620 | return &res->pub; | |
621 | } | |
622 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
623 | ||
624 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
625 | { | |
626 | struct cfg80211_internal_bss *bss; | |
627 | ||
628 | if (!pub) | |
629 | return; | |
630 | ||
631 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
632 | kref_put(&bss->ref, bss_release); | |
633 | } | |
634 | EXPORT_SYMBOL(cfg80211_put_bss); | |
635 | ||
d491af19 JB |
636 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
637 | { | |
638 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
639 | struct cfg80211_internal_bss *bss; | |
640 | ||
641 | if (WARN_ON(!pub)) | |
642 | return; | |
643 | ||
644 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
645 | ||
646 | spin_lock_bh(&dev->bss_lock); | |
647 | ||
648 | list_del(&bss->list); | |
f5ea9120 | 649 | dev->bss_generation++; |
d491af19 JB |
650 | rb_erase(&bss->rbn, &dev->bss_tree); |
651 | ||
652 | spin_unlock_bh(&dev->bss_lock); | |
653 | ||
654 | kref_put(&bss->ref, bss_release); | |
655 | } | |
656 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
657 | ||
3d23e349 | 658 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
659 | int cfg80211_wext_siwscan(struct net_device *dev, |
660 | struct iw_request_info *info, | |
661 | union iwreq_data *wrqu, char *extra) | |
662 | { | |
663 | struct cfg80211_registered_device *rdev; | |
664 | struct wiphy *wiphy; | |
665 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 666 | struct cfg80211_scan_request *creq = NULL; |
2a519311 JB |
667 | int i, err, n_channels = 0; |
668 | enum ieee80211_band band; | |
669 | ||
670 | if (!netif_running(dev)) | |
671 | return -ENETDOWN; | |
672 | ||
b2e3abdc HS |
673 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
674 | wreq = (struct iw_scan_req *)extra; | |
675 | ||
463d0183 | 676 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
677 | |
678 | if (IS_ERR(rdev)) | |
679 | return PTR_ERR(rdev); | |
680 | ||
681 | if (rdev->scan_req) { | |
682 | err = -EBUSY; | |
683 | goto out; | |
684 | } | |
685 | ||
686 | wiphy = &rdev->wiphy; | |
687 | ||
b2e3abdc HS |
688 | /* Determine number of channels, needed to allocate creq */ |
689 | if (wreq && wreq->num_channels) | |
690 | n_channels = wreq->num_channels; | |
691 | else { | |
692 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
693 | if (wiphy->bands[band]) | |
694 | n_channels += wiphy->bands[band]->n_channels; | |
695 | } | |
2a519311 JB |
696 | |
697 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
698 | n_channels * sizeof(void *), | |
699 | GFP_ATOMIC); | |
700 | if (!creq) { | |
701 | err = -ENOMEM; | |
702 | goto out; | |
703 | } | |
704 | ||
705 | creq->wiphy = wiphy; | |
463d0183 | 706 | creq->dev = dev; |
5ba63533 JB |
707 | /* SSIDs come after channels */ |
708 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
709 | creq->n_channels = n_channels; |
710 | creq->n_ssids = 1; | |
711 | ||
b2e3abdc | 712 | /* translate "Scan on frequencies" request */ |
2a519311 JB |
713 | i = 0; |
714 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
715 | int j; | |
584991dc | 716 | |
2a519311 JB |
717 | if (!wiphy->bands[band]) |
718 | continue; | |
584991dc | 719 | |
2a519311 | 720 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
721 | /* ignore disabled channels */ |
722 | if (wiphy->bands[band]->channels[j].flags & | |
723 | IEEE80211_CHAN_DISABLED) | |
724 | continue; | |
b2e3abdc HS |
725 | |
726 | /* If we have a wireless request structure and the | |
727 | * wireless request specifies frequencies, then search | |
728 | * for the matching hardware channel. | |
729 | */ | |
730 | if (wreq && wreq->num_channels) { | |
731 | int k; | |
732 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
733 | for (k = 0; k < wreq->num_channels; k++) { | |
a4e7b730 | 734 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
b2e3abdc HS |
735 | if (wext_freq == wiphy_freq) |
736 | goto wext_freq_found; | |
737 | } | |
738 | goto wext_freq_not_found; | |
739 | } | |
740 | ||
741 | wext_freq_found: | |
2a519311 JB |
742 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
743 | i++; | |
b2e3abdc | 744 | wext_freq_not_found: ; |
2a519311 JB |
745 | } |
746 | } | |
8862dc5f HS |
747 | /* No channels found? */ |
748 | if (!i) { | |
749 | err = -EINVAL; | |
750 | goto out; | |
751 | } | |
2a519311 | 752 | |
b2e3abdc HS |
753 | /* Set real number of channels specified in creq->channels[] */ |
754 | creq->n_channels = i; | |
2a519311 | 755 | |
b2e3abdc HS |
756 | /* translate "Scan for SSID" request */ |
757 | if (wreq) { | |
2a519311 | 758 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
759 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
760 | err = -EINVAL; | |
761 | goto out; | |
762 | } | |
2a519311 JB |
763 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
764 | creq->ssids[0].ssid_len = wreq->essid_len; | |
765 | } | |
766 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
767 | creq->n_ssids = 0; | |
768 | } | |
769 | ||
770 | rdev->scan_req = creq; | |
771 | err = rdev->ops->scan(wiphy, dev, creq); | |
772 | if (err) { | |
773 | rdev->scan_req = NULL; | |
65486c8b | 774 | /* creq will be freed below */ |
463d0183 | 775 | } else { |
a538e2d5 | 776 | nl80211_send_scan_start(rdev, dev); |
65486c8b JB |
777 | /* creq now owned by driver */ |
778 | creq = NULL; | |
463d0183 JB |
779 | dev_hold(dev); |
780 | } | |
2a519311 | 781 | out: |
65486c8b | 782 | kfree(creq); |
4d0c8aea | 783 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
784 | return err; |
785 | } | |
ba44cb72 | 786 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
787 | |
788 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
789 | struct cfg80211_bss *bss, | |
790 | char **current_ev, char *end_buf) | |
791 | { | |
792 | u8 *pos, *end, *next; | |
793 | struct iw_event iwe; | |
794 | ||
795 | if (!bss->information_elements || | |
796 | !bss->len_information_elements) | |
797 | return; | |
798 | ||
799 | /* | |
800 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
801 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
802 | */ | |
803 | pos = bss->information_elements; | |
804 | end = pos + bss->len_information_elements; | |
805 | ||
806 | while (end - pos > IW_GENERIC_IE_MAX) { | |
807 | next = pos + 2 + pos[1]; | |
808 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
809 | next = next + 2 + next[1]; | |
810 | ||
811 | memset(&iwe, 0, sizeof(iwe)); | |
812 | iwe.cmd = IWEVGENIE; | |
813 | iwe.u.data.length = next - pos; | |
814 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
815 | end_buf, &iwe, pos); | |
816 | ||
817 | pos = next; | |
818 | } | |
819 | ||
820 | if (end > pos) { | |
821 | memset(&iwe, 0, sizeof(iwe)); | |
822 | iwe.cmd = IWEVGENIE; | |
823 | iwe.u.data.length = end - pos; | |
824 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
825 | end_buf, &iwe, pos); | |
826 | } | |
827 | } | |
828 | ||
cb3a8eec DW |
829 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
830 | { | |
831 | unsigned long end = jiffies; | |
832 | ||
833 | if (end >= start) | |
834 | return jiffies_to_msecs(end - start); | |
835 | ||
836 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
837 | } | |
2a519311 JB |
838 | |
839 | static char * | |
77965c97 JB |
840 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
841 | struct cfg80211_internal_bss *bss, char *current_ev, | |
842 | char *end_buf) | |
2a519311 JB |
843 | { |
844 | struct iw_event iwe; | |
845 | u8 *buf, *cfg, *p; | |
846 | u8 *ie = bss->pub.information_elements; | |
a77b8552 | 847 | int rem = bss->pub.len_information_elements, i, sig; |
2a519311 JB |
848 | bool ismesh = false; |
849 | ||
850 | memset(&iwe, 0, sizeof(iwe)); | |
851 | iwe.cmd = SIOCGIWAP; | |
852 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
853 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
854 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
855 | IW_EV_ADDR_LEN); | |
856 | ||
857 | memset(&iwe, 0, sizeof(iwe)); | |
858 | iwe.cmd = SIOCGIWFREQ; | |
859 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
860 | iwe.u.freq.e = 0; | |
861 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
862 | IW_EV_FREQ_LEN); | |
863 | ||
864 | memset(&iwe, 0, sizeof(iwe)); | |
865 | iwe.cmd = SIOCGIWFREQ; | |
866 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
867 | iwe.u.freq.e = 6; | |
868 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
869 | IW_EV_FREQ_LEN); | |
870 | ||
77965c97 | 871 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
872 | memset(&iwe, 0, sizeof(iwe)); |
873 | iwe.cmd = IWEVQUAL; | |
874 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
875 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 876 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 877 | switch (wiphy->signal_type) { |
2a519311 | 878 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
879 | sig = bss->pub.signal / 100; |
880 | iwe.u.qual.level = sig; | |
2a519311 | 881 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
882 | if (sig < -110) /* rather bad */ |
883 | sig = -110; | |
884 | else if (sig > -40) /* perfect */ | |
885 | sig = -40; | |
886 | /* will give a range of 0 .. 70 */ | |
887 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
888 | break; |
889 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
890 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
891 | /* will give range 0 .. 100 */ |
892 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
893 | break; |
894 | default: | |
895 | /* not reached */ | |
896 | break; | |
897 | } | |
898 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
899 | &iwe, IW_EV_QUAL_LEN); | |
900 | } | |
901 | ||
902 | memset(&iwe, 0, sizeof(iwe)); | |
903 | iwe.cmd = SIOCGIWENCODE; | |
904 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
905 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
906 | else | |
907 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
908 | iwe.u.data.length = 0; | |
909 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
910 | &iwe, ""); | |
911 | ||
912 | while (rem >= 2) { | |
913 | /* invalid data */ | |
914 | if (ie[1] > rem - 2) | |
915 | break; | |
916 | ||
917 | switch (ie[0]) { | |
918 | case WLAN_EID_SSID: | |
919 | memset(&iwe, 0, sizeof(iwe)); | |
920 | iwe.cmd = SIOCGIWESSID; | |
921 | iwe.u.data.length = ie[1]; | |
922 | iwe.u.data.flags = 1; | |
923 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
924 | &iwe, ie + 2); | |
925 | break; | |
926 | case WLAN_EID_MESH_ID: | |
927 | memset(&iwe, 0, sizeof(iwe)); | |
928 | iwe.cmd = SIOCGIWESSID; | |
929 | iwe.u.data.length = ie[1]; | |
930 | iwe.u.data.flags = 1; | |
931 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
932 | &iwe, ie + 2); | |
933 | break; | |
934 | case WLAN_EID_MESH_CONFIG: | |
935 | ismesh = true; | |
136cfa28 | 936 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
937 | break; |
938 | buf = kmalloc(50, GFP_ATOMIC); | |
939 | if (!buf) | |
940 | break; | |
941 | cfg = ie + 2; | |
942 | memset(&iwe, 0, sizeof(iwe)); | |
943 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
944 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
945 | "0x%02X", cfg[0]); | |
2a519311 JB |
946 | iwe.u.data.length = strlen(buf); |
947 | current_ev = iwe_stream_add_point(info, current_ev, | |
948 | end_buf, | |
949 | &iwe, buf); | |
76aa5e70 RP |
950 | sprintf(buf, "Path Selection Metric ID: 0x%02X", |
951 | cfg[1]); | |
2a519311 JB |
952 | iwe.u.data.length = strlen(buf); |
953 | current_ev = iwe_stream_add_point(info, current_ev, | |
954 | end_buf, | |
955 | &iwe, buf); | |
76aa5e70 RP |
956 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
957 | cfg[2]); | |
2a519311 JB |
958 | iwe.u.data.length = strlen(buf); |
959 | current_ev = iwe_stream_add_point(info, current_ev, | |
960 | end_buf, | |
961 | &iwe, buf); | |
76aa5e70 | 962 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 JB |
963 | iwe.u.data.length = strlen(buf); |
964 | current_ev = iwe_stream_add_point(info, current_ev, | |
965 | end_buf, | |
966 | &iwe, buf); | |
76aa5e70 RP |
967 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
968 | iwe.u.data.length = strlen(buf); | |
969 | current_ev = iwe_stream_add_point(info, current_ev, | |
970 | end_buf, | |
971 | &iwe, buf); | |
972 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); | |
973 | iwe.u.data.length = strlen(buf); | |
974 | current_ev = iwe_stream_add_point(info, current_ev, | |
975 | end_buf, | |
976 | &iwe, buf); | |
977 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); | |
2a519311 JB |
978 | iwe.u.data.length = strlen(buf); |
979 | current_ev = iwe_stream_add_point(info, current_ev, | |
980 | end_buf, | |
981 | &iwe, buf); | |
982 | kfree(buf); | |
983 | break; | |
984 | case WLAN_EID_SUPP_RATES: | |
985 | case WLAN_EID_EXT_SUPP_RATES: | |
986 | /* display all supported rates in readable format */ | |
987 | p = current_ev + iwe_stream_lcp_len(info); | |
988 | ||
989 | memset(&iwe, 0, sizeof(iwe)); | |
990 | iwe.cmd = SIOCGIWRATE; | |
991 | /* Those two flags are ignored... */ | |
992 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
993 | ||
994 | for (i = 0; i < ie[1]; i++) { | |
995 | iwe.u.bitrate.value = | |
996 | ((ie[i + 2] & 0x7f) * 500000); | |
997 | p = iwe_stream_add_value(info, current_ev, p, | |
998 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
999 | } | |
1000 | current_ev = p; | |
1001 | break; | |
1002 | } | |
1003 | rem -= ie[1] + 2; | |
1004 | ie += ie[1] + 2; | |
1005 | } | |
1006 | ||
f64f9e71 JP |
1007 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1008 | ismesh) { | |
2a519311 JB |
1009 | memset(&iwe, 0, sizeof(iwe)); |
1010 | iwe.cmd = SIOCGIWMODE; | |
1011 | if (ismesh) | |
1012 | iwe.u.mode = IW_MODE_MESH; | |
1013 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1014 | iwe.u.mode = IW_MODE_MASTER; | |
1015 | else | |
1016 | iwe.u.mode = IW_MODE_ADHOC; | |
1017 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1018 | &iwe, IW_EV_UINT_LEN); | |
1019 | } | |
1020 | ||
1021 | buf = kmalloc(30, GFP_ATOMIC); | |
1022 | if (buf) { | |
1023 | memset(&iwe, 0, sizeof(iwe)); | |
1024 | iwe.cmd = IWEVCUSTOM; | |
1025 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
1026 | iwe.u.data.length = strlen(buf); | |
1027 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1028 | &iwe, buf); | |
1029 | memset(&iwe, 0, sizeof(iwe)); | |
1030 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
1031 | sprintf(buf, " Last beacon: %ums ago", |
1032 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
1033 | iwe.u.data.length = strlen(buf); |
1034 | current_ev = iwe_stream_add_point(info, current_ev, | |
1035 | end_buf, &iwe, buf); | |
1036 | kfree(buf); | |
1037 | } | |
1038 | ||
1039 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
1040 | ||
1041 | return current_ev; | |
1042 | } | |
1043 | ||
1044 | ||
1045 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
1046 | struct iw_request_info *info, | |
1047 | char *buf, size_t len) | |
1048 | { | |
1049 | char *current_ev = buf; | |
1050 | char *end_buf = buf + len; | |
1051 | struct cfg80211_internal_bss *bss; | |
1052 | ||
1053 | spin_lock_bh(&dev->bss_lock); | |
1054 | cfg80211_bss_expire(dev); | |
1055 | ||
1056 | list_for_each_entry(bss, &dev->bss_list, list) { | |
1057 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
1058 | spin_unlock_bh(&dev->bss_lock); | |
1059 | return -E2BIG; | |
1060 | } | |
77965c97 JB |
1061 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
1062 | current_ev, end_buf); | |
2a519311 JB |
1063 | } |
1064 | spin_unlock_bh(&dev->bss_lock); | |
1065 | return current_ev - buf; | |
1066 | } | |
1067 | ||
1068 | ||
1069 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1070 | struct iw_request_info *info, | |
1071 | struct iw_point *data, char *extra) | |
1072 | { | |
1073 | struct cfg80211_registered_device *rdev; | |
1074 | int res; | |
1075 | ||
1076 | if (!netif_running(dev)) | |
1077 | return -ENETDOWN; | |
1078 | ||
463d0183 | 1079 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1080 | |
1081 | if (IS_ERR(rdev)) | |
1082 | return PTR_ERR(rdev); | |
1083 | ||
1084 | if (rdev->scan_req) { | |
1085 | res = -EAGAIN; | |
1086 | goto out; | |
1087 | } | |
1088 | ||
1089 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1090 | data->length = 0; | |
1091 | if (res >= 0) { | |
1092 | data->length = res; | |
1093 | res = 0; | |
1094 | } | |
1095 | ||
1096 | out: | |
4d0c8aea | 1097 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1098 | return res; |
1099 | } | |
ba44cb72 | 1100 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 1101 | #endif |