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> | |
15 | #include <net/iw_handler.h> | |
16 | #include "core.h" | |
17 | #include "nl80211.h" | |
a9a11622 | 18 | #include "wext-compat.h" |
2a519311 | 19 | |
09f97e0f | 20 | #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ) |
2a519311 | 21 | |
01a0ac41 | 22 | void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak) |
2a519311 | 23 | { |
667503dd | 24 | struct cfg80211_scan_request *request; |
2a519311 | 25 | struct net_device *dev; |
3d23e349 | 26 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
27 | union iwreq_data wrqu; |
28 | #endif | |
29 | ||
01a0ac41 JB |
30 | ASSERT_RDEV_LOCK(rdev); |
31 | ||
667503dd JB |
32 | request = rdev->scan_req; |
33 | ||
01a0ac41 JB |
34 | if (!request) |
35 | return; | |
36 | ||
463d0183 | 37 | dev = request->dev; |
2a519311 | 38 | |
6829c878 JB |
39 | /* |
40 | * This must be before sending the other events! | |
41 | * Otherwise, wpa_supplicant gets completely confused with | |
42 | * wext events. | |
43 | */ | |
44 | cfg80211_sme_scan_done(dev); | |
45 | ||
667503dd | 46 | if (request->aborted) |
36e6fea8 | 47 | nl80211_send_scan_aborted(rdev, dev); |
2a519311 | 48 | else |
36e6fea8 | 49 | nl80211_send_scan_done(rdev, dev); |
2a519311 | 50 | |
3d23e349 | 51 | #ifdef CONFIG_CFG80211_WEXT |
667503dd | 52 | if (!request->aborted) { |
2a519311 JB |
53 | memset(&wrqu, 0, sizeof(wrqu)); |
54 | ||
55 | wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL); | |
56 | } | |
57 | #endif | |
58 | ||
59 | dev_put(dev); | |
60 | ||
36e6fea8 | 61 | rdev->scan_req = NULL; |
01a0ac41 JB |
62 | |
63 | /* | |
64 | * OK. If this is invoked with "leak" then we can't | |
65 | * free this ... but we've cleaned it up anyway. The | |
66 | * driver failed to call the scan_done callback, so | |
67 | * all bets are off, it might still be trying to use | |
68 | * the scan request or not ... if it accesses the dev | |
69 | * in there (it shouldn't anyway) then it may crash. | |
70 | */ | |
71 | if (!leak) | |
72 | kfree(request); | |
2a519311 | 73 | } |
667503dd | 74 | |
36e6fea8 JB |
75 | void __cfg80211_scan_done(struct work_struct *wk) |
76 | { | |
77 | struct cfg80211_registered_device *rdev; | |
78 | ||
79 | rdev = container_of(wk, struct cfg80211_registered_device, | |
80 | scan_done_wk); | |
81 | ||
82 | cfg80211_lock_rdev(rdev); | |
01a0ac41 | 83 | ___cfg80211_scan_done(rdev, false); |
36e6fea8 JB |
84 | cfg80211_unlock_rdev(rdev); |
85 | } | |
86 | ||
667503dd JB |
87 | void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted) |
88 | { | |
667503dd JB |
89 | WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req); |
90 | ||
91 | request->aborted = aborted; | |
e60d7443 | 92 | queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk); |
667503dd | 93 | } |
2a519311 JB |
94 | EXPORT_SYMBOL(cfg80211_scan_done); |
95 | ||
96 | static void bss_release(struct kref *ref) | |
97 | { | |
98 | struct cfg80211_internal_bss *bss; | |
99 | ||
100 | bss = container_of(ref, struct cfg80211_internal_bss, ref); | |
78c1c7e1 JB |
101 | if (bss->pub.free_priv) |
102 | bss->pub.free_priv(&bss->pub); | |
cd1658f5 | 103 | |
34a6eddb JM |
104 | if (bss->beacon_ies_allocated) |
105 | kfree(bss->pub.beacon_ies); | |
106 | if (bss->proberesp_ies_allocated) | |
107 | kfree(bss->pub.proberesp_ies); | |
cd1658f5 | 108 | |
19957bb3 JB |
109 | BUG_ON(atomic_read(&bss->hold)); |
110 | ||
2a519311 JB |
111 | kfree(bss); |
112 | } | |
113 | ||
cb3a8eec DW |
114 | /* must hold dev->bss_lock! */ |
115 | void cfg80211_bss_age(struct cfg80211_registered_device *dev, | |
116 | unsigned long age_secs) | |
117 | { | |
118 | struct cfg80211_internal_bss *bss; | |
119 | unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); | |
120 | ||
121 | list_for_each_entry(bss, &dev->bss_list, list) { | |
122 | bss->ts -= age_jiffies; | |
123 | } | |
124 | } | |
125 | ||
2a519311 JB |
126 | /* must hold dev->bss_lock! */ |
127 | void cfg80211_bss_expire(struct cfg80211_registered_device *dev) | |
128 | { | |
129 | struct cfg80211_internal_bss *bss, *tmp; | |
130 | bool expired = false; | |
131 | ||
132 | list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) { | |
19957bb3 JB |
133 | if (atomic_read(&bss->hold)) |
134 | continue; | |
135 | if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE)) | |
2a519311 JB |
136 | continue; |
137 | list_del(&bss->list); | |
138 | rb_erase(&bss->rbn, &dev->bss_tree); | |
139 | kref_put(&bss->ref, bss_release); | |
140 | expired = true; | |
141 | } | |
142 | ||
143 | if (expired) | |
144 | dev->bss_generation++; | |
145 | } | |
146 | ||
c21dbf92 | 147 | const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len) |
2a519311 | 148 | { |
c21dbf92 | 149 | while (len > 2 && ies[0] != eid) { |
2a519311 JB |
150 | len -= ies[1] + 2; |
151 | ies += ies[1] + 2; | |
152 | } | |
153 | if (len < 2) | |
154 | return NULL; | |
155 | if (len < 2 + ies[1]) | |
156 | return NULL; | |
157 | return ies; | |
158 | } | |
c21dbf92 | 159 | EXPORT_SYMBOL(cfg80211_find_ie); |
2a519311 JB |
160 | |
161 | static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2) | |
162 | { | |
c21dbf92 JB |
163 | const u8 *ie1 = cfg80211_find_ie(num, ies1, len1); |
164 | const u8 *ie2 = cfg80211_find_ie(num, ies2, len2); | |
2a519311 JB |
165 | int r; |
166 | ||
167 | if (!ie1 && !ie2) | |
168 | return 0; | |
cd3468ba | 169 | if (!ie1 || !ie2) |
2a519311 JB |
170 | return -1; |
171 | ||
172 | r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1])); | |
173 | if (r == 0 && ie1[1] != ie2[1]) | |
174 | return ie2[1] - ie1[1]; | |
175 | return r; | |
176 | } | |
177 | ||
178 | static bool is_bss(struct cfg80211_bss *a, | |
179 | const u8 *bssid, | |
180 | const u8 *ssid, size_t ssid_len) | |
181 | { | |
182 | const u8 *ssidie; | |
183 | ||
79420f09 | 184 | if (bssid && compare_ether_addr(a->bssid, bssid)) |
2a519311 JB |
185 | return false; |
186 | ||
79420f09 JB |
187 | if (!ssid) |
188 | return true; | |
189 | ||
c21dbf92 JB |
190 | ssidie = cfg80211_find_ie(WLAN_EID_SSID, |
191 | a->information_elements, | |
192 | a->len_information_elements); | |
2a519311 JB |
193 | if (!ssidie) |
194 | return false; | |
195 | if (ssidie[1] != ssid_len) | |
196 | return false; | |
197 | return memcmp(ssidie + 2, ssid, ssid_len) == 0; | |
198 | } | |
199 | ||
200 | static bool is_mesh(struct cfg80211_bss *a, | |
201 | const u8 *meshid, size_t meshidlen, | |
202 | const u8 *meshcfg) | |
203 | { | |
204 | const u8 *ie; | |
205 | ||
206 | if (!is_zero_ether_addr(a->bssid)) | |
207 | return false; | |
208 | ||
c21dbf92 JB |
209 | ie = cfg80211_find_ie(WLAN_EID_MESH_ID, |
210 | a->information_elements, | |
211 | a->len_information_elements); | |
2a519311 JB |
212 | if (!ie) |
213 | return false; | |
214 | if (ie[1] != meshidlen) | |
215 | return false; | |
216 | if (memcmp(ie + 2, meshid, meshidlen)) | |
217 | return false; | |
218 | ||
c21dbf92 JB |
219 | ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, |
220 | a->information_elements, | |
221 | a->len_information_elements); | |
cd3468ba JB |
222 | if (!ie) |
223 | return false; | |
136cfa28 | 224 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
225 | return false; |
226 | ||
227 | /* | |
228 | * Ignore mesh capability (last two bytes of the IE) when | |
229 | * comparing since that may differ between stations taking | |
230 | * part in the same mesh. | |
231 | */ | |
136cfa28 RP |
232 | return memcmp(ie + 2, meshcfg, |
233 | sizeof(struct ieee80211_meshconf_ie) - 2) == 0; | |
2a519311 JB |
234 | } |
235 | ||
236 | static int cmp_bss(struct cfg80211_bss *a, | |
237 | struct cfg80211_bss *b) | |
238 | { | |
239 | int r; | |
240 | ||
241 | if (a->channel != b->channel) | |
242 | return b->channel->center_freq - a->channel->center_freq; | |
243 | ||
244 | r = memcmp(a->bssid, b->bssid, ETH_ALEN); | |
245 | if (r) | |
246 | return r; | |
247 | ||
248 | if (is_zero_ether_addr(a->bssid)) { | |
249 | r = cmp_ies(WLAN_EID_MESH_ID, | |
250 | a->information_elements, | |
251 | a->len_information_elements, | |
252 | b->information_elements, | |
253 | b->len_information_elements); | |
254 | if (r) | |
255 | return r; | |
256 | return cmp_ies(WLAN_EID_MESH_CONFIG, | |
257 | a->information_elements, | |
258 | a->len_information_elements, | |
259 | b->information_elements, | |
260 | b->len_information_elements); | |
261 | } | |
262 | ||
263 | return cmp_ies(WLAN_EID_SSID, | |
264 | a->information_elements, | |
265 | a->len_information_elements, | |
266 | b->information_elements, | |
267 | b->len_information_elements); | |
268 | } | |
269 | ||
270 | struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy, | |
271 | struct ieee80211_channel *channel, | |
272 | const u8 *bssid, | |
79420f09 JB |
273 | const u8 *ssid, size_t ssid_len, |
274 | u16 capa_mask, u16 capa_val) | |
2a519311 JB |
275 | { |
276 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
277 | struct cfg80211_internal_bss *bss, *res = NULL; | |
ccb6c136 | 278 | unsigned long now = jiffies; |
2a519311 JB |
279 | |
280 | spin_lock_bh(&dev->bss_lock); | |
281 | ||
282 | list_for_each_entry(bss, &dev->bss_list, list) { | |
79420f09 JB |
283 | if ((bss->pub.capability & capa_mask) != capa_val) |
284 | continue; | |
2a519311 JB |
285 | if (channel && bss->pub.channel != channel) |
286 | continue; | |
ccb6c136 JB |
287 | /* Don't get expired BSS structs */ |
288 | if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && | |
289 | !atomic_read(&bss->hold)) | |
290 | continue; | |
2a519311 JB |
291 | if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { |
292 | res = bss; | |
293 | kref_get(&res->ref); | |
294 | break; | |
295 | } | |
296 | } | |
297 | ||
298 | spin_unlock_bh(&dev->bss_lock); | |
299 | if (!res) | |
300 | return NULL; | |
301 | return &res->pub; | |
302 | } | |
303 | EXPORT_SYMBOL(cfg80211_get_bss); | |
304 | ||
305 | struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy, | |
306 | struct ieee80211_channel *channel, | |
307 | const u8 *meshid, size_t meshidlen, | |
308 | const u8 *meshcfg) | |
309 | { | |
310 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
311 | struct cfg80211_internal_bss *bss, *res = NULL; | |
312 | ||
313 | spin_lock_bh(&dev->bss_lock); | |
314 | ||
315 | list_for_each_entry(bss, &dev->bss_list, list) { | |
316 | if (channel && bss->pub.channel != channel) | |
317 | continue; | |
318 | if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) { | |
319 | res = bss; | |
320 | kref_get(&res->ref); | |
321 | break; | |
322 | } | |
323 | } | |
324 | ||
325 | spin_unlock_bh(&dev->bss_lock); | |
326 | if (!res) | |
327 | return NULL; | |
328 | return &res->pub; | |
329 | } | |
330 | EXPORT_SYMBOL(cfg80211_get_mesh); | |
331 | ||
332 | ||
333 | static void rb_insert_bss(struct cfg80211_registered_device *dev, | |
334 | struct cfg80211_internal_bss *bss) | |
335 | { | |
336 | struct rb_node **p = &dev->bss_tree.rb_node; | |
337 | struct rb_node *parent = NULL; | |
338 | struct cfg80211_internal_bss *tbss; | |
339 | int cmp; | |
340 | ||
341 | while (*p) { | |
342 | parent = *p; | |
343 | tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); | |
344 | ||
345 | cmp = cmp_bss(&bss->pub, &tbss->pub); | |
346 | ||
347 | if (WARN_ON(!cmp)) { | |
348 | /* will sort of leak this BSS */ | |
349 | return; | |
350 | } | |
351 | ||
352 | if (cmp < 0) | |
353 | p = &(*p)->rb_left; | |
354 | else | |
355 | p = &(*p)->rb_right; | |
356 | } | |
357 | ||
358 | rb_link_node(&bss->rbn, parent, p); | |
359 | rb_insert_color(&bss->rbn, &dev->bss_tree); | |
360 | } | |
361 | ||
362 | static struct cfg80211_internal_bss * | |
363 | rb_find_bss(struct cfg80211_registered_device *dev, | |
364 | struct cfg80211_internal_bss *res) | |
365 | { | |
366 | struct rb_node *n = dev->bss_tree.rb_node; | |
367 | struct cfg80211_internal_bss *bss; | |
368 | int r; | |
369 | ||
370 | while (n) { | |
371 | bss = rb_entry(n, struct cfg80211_internal_bss, rbn); | |
372 | r = cmp_bss(&res->pub, &bss->pub); | |
373 | ||
374 | if (r == 0) | |
375 | return bss; | |
376 | else if (r < 0) | |
377 | n = n->rb_left; | |
378 | else | |
379 | n = n->rb_right; | |
380 | } | |
381 | ||
382 | return NULL; | |
383 | } | |
384 | ||
385 | static struct cfg80211_internal_bss * | |
386 | cfg80211_bss_update(struct cfg80211_registered_device *dev, | |
34a6eddb | 387 | struct cfg80211_internal_bss *res) |
2a519311 JB |
388 | { |
389 | struct cfg80211_internal_bss *found = NULL; | |
390 | const u8 *meshid, *meshcfg; | |
391 | ||
392 | /* | |
393 | * The reference to "res" is donated to this function. | |
394 | */ | |
395 | ||
396 | if (WARN_ON(!res->pub.channel)) { | |
397 | kref_put(&res->ref, bss_release); | |
398 | return NULL; | |
399 | } | |
400 | ||
401 | res->ts = jiffies; | |
402 | ||
403 | if (is_zero_ether_addr(res->pub.bssid)) { | |
404 | /* must be mesh, verify */ | |
c21dbf92 JB |
405 | meshid = cfg80211_find_ie(WLAN_EID_MESH_ID, |
406 | res->pub.information_elements, | |
407 | res->pub.len_information_elements); | |
408 | meshcfg = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, | |
409 | res->pub.information_elements, | |
410 | res->pub.len_information_elements); | |
2a519311 | 411 | if (!meshid || !meshcfg || |
136cfa28 | 412 | meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) { |
2a519311 JB |
413 | /* bogus mesh */ |
414 | kref_put(&res->ref, bss_release); | |
415 | return NULL; | |
416 | } | |
417 | } | |
418 | ||
419 | spin_lock_bh(&dev->bss_lock); | |
420 | ||
421 | found = rb_find_bss(dev, res); | |
422 | ||
cd1658f5 | 423 | if (found) { |
2a519311 JB |
424 | found->pub.beacon_interval = res->pub.beacon_interval; |
425 | found->pub.tsf = res->pub.tsf; | |
426 | found->pub.signal = res->pub.signal; | |
2a519311 JB |
427 | found->pub.capability = res->pub.capability; |
428 | found->ts = res->ts; | |
cd1658f5 | 429 | |
34a6eddb JM |
430 | /* Update IEs */ |
431 | if (res->pub.proberesp_ies) { | |
cd1658f5 | 432 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); |
34a6eddb JM |
433 | size_t ielen = res->pub.len_proberesp_ies; |
434 | ||
435 | if (found->pub.proberesp_ies && | |
436 | !found->proberesp_ies_allocated && | |
437 | ksize(found) >= used + ielen) { | |
438 | memcpy(found->pub.proberesp_ies, | |
439 | res->pub.proberesp_ies, ielen); | |
440 | found->pub.len_proberesp_ies = ielen; | |
441 | } else { | |
442 | u8 *ies = found->pub.proberesp_ies; | |
443 | ||
444 | if (found->proberesp_ies_allocated) | |
445 | ies = krealloc(ies, ielen, GFP_ATOMIC); | |
446 | else | |
447 | ies = kmalloc(ielen, GFP_ATOMIC); | |
448 | ||
449 | if (ies) { | |
450 | memcpy(ies, res->pub.proberesp_ies, | |
451 | ielen); | |
452 | found->proberesp_ies_allocated = true; | |
453 | found->pub.proberesp_ies = ies; | |
454 | found->pub.len_proberesp_ies = ielen; | |
455 | } | |
456 | } | |
cd1658f5 | 457 | |
34a6eddb JM |
458 | /* Override possible earlier Beacon frame IEs */ |
459 | found->pub.information_elements = | |
460 | found->pub.proberesp_ies; | |
461 | found->pub.len_information_elements = | |
462 | found->pub.len_proberesp_ies; | |
463 | } | |
464 | if (res->pub.beacon_ies) { | |
465 | size_t used = dev->wiphy.bss_priv_size + sizeof(*res); | |
466 | size_t ielen = res->pub.len_beacon_ies; | |
467 | ||
468 | if (found->pub.beacon_ies && | |
469 | !found->beacon_ies_allocated && | |
470 | ksize(found) >= used + ielen) { | |
471 | memcpy(found->pub.beacon_ies, | |
472 | res->pub.beacon_ies, ielen); | |
473 | found->pub.len_beacon_ies = ielen; | |
cd1658f5 | 474 | } else { |
34a6eddb | 475 | u8 *ies = found->pub.beacon_ies; |
cd1658f5 | 476 | |
34a6eddb | 477 | if (found->beacon_ies_allocated) |
273de92c MB |
478 | ies = krealloc(ies, ielen, GFP_ATOMIC); |
479 | else | |
cd1658f5 JB |
480 | ies = kmalloc(ielen, GFP_ATOMIC); |
481 | ||
482 | if (ies) { | |
34a6eddb JM |
483 | memcpy(ies, res->pub.beacon_ies, |
484 | ielen); | |
485 | found->beacon_ies_allocated = true; | |
486 | found->pub.beacon_ies = ies; | |
487 | found->pub.len_beacon_ies = ielen; | |
cd1658f5 JB |
488 | } |
489 | } | |
490 | } | |
491 | ||
2a519311 JB |
492 | kref_put(&res->ref, bss_release); |
493 | } else { | |
494 | /* this "consumes" the reference */ | |
495 | list_add_tail(&res->list, &dev->bss_list); | |
496 | rb_insert_bss(dev, res); | |
497 | found = res; | |
498 | } | |
499 | ||
500 | dev->bss_generation++; | |
501 | spin_unlock_bh(&dev->bss_lock); | |
502 | ||
503 | kref_get(&found->ref); | |
504 | return found; | |
505 | } | |
506 | ||
06aa7afa JK |
507 | struct cfg80211_bss* |
508 | cfg80211_inform_bss(struct wiphy *wiphy, | |
509 | struct ieee80211_channel *channel, | |
510 | const u8 *bssid, | |
511 | u64 timestamp, u16 capability, u16 beacon_interval, | |
512 | const u8 *ie, size_t ielen, | |
513 | s32 signal, gfp_t gfp) | |
514 | { | |
515 | struct cfg80211_internal_bss *res; | |
516 | size_t privsz; | |
517 | ||
518 | if (WARN_ON(!wiphy)) | |
519 | return NULL; | |
520 | ||
521 | privsz = wiphy->bss_priv_size; | |
522 | ||
22fe88d3 | 523 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
06aa7afa JK |
524 | (signal < 0 || signal > 100))) |
525 | return NULL; | |
526 | ||
527 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
528 | if (!res) | |
529 | return NULL; | |
530 | ||
531 | memcpy(res->pub.bssid, bssid, ETH_ALEN); | |
532 | res->pub.channel = channel; | |
533 | res->pub.signal = signal; | |
534 | res->pub.tsf = timestamp; | |
535 | res->pub.beacon_interval = beacon_interval; | |
536 | res->pub.capability = capability; | |
34a6eddb JM |
537 | /* |
538 | * Since we do not know here whether the IEs are from a Beacon or Probe | |
539 | * Response frame, we need to pick one of the options and only use it | |
540 | * with the driver that does not provide the full Beacon/Probe Response | |
541 | * frame. Use Beacon frame pointer to avoid indicating that this should | |
542 | * override the information_elements pointer should we have received an | |
543 | * earlier indication of Probe Response data. | |
544 | * | |
545 | * The initial buffer for the IEs is allocated with the BSS entry and | |
546 | * is located after the private area. | |
547 | */ | |
548 | res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz; | |
549 | memcpy(res->pub.beacon_ies, ie, ielen); | |
550 | res->pub.len_beacon_ies = ielen; | |
551 | res->pub.information_elements = res->pub.beacon_ies; | |
552 | res->pub.len_information_elements = res->pub.len_beacon_ies; | |
06aa7afa JK |
553 | |
554 | kref_init(&res->ref); | |
555 | ||
34a6eddb | 556 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); |
06aa7afa JK |
557 | if (!res) |
558 | return NULL; | |
559 | ||
560 | if (res->pub.capability & WLAN_CAPABILITY_ESS) | |
561 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
562 | ||
563 | /* cfg80211_bss_update gives us a referenced result */ | |
564 | return &res->pub; | |
565 | } | |
566 | EXPORT_SYMBOL(cfg80211_inform_bss); | |
567 | ||
2a519311 JB |
568 | struct cfg80211_bss * |
569 | cfg80211_inform_bss_frame(struct wiphy *wiphy, | |
570 | struct ieee80211_channel *channel, | |
571 | struct ieee80211_mgmt *mgmt, size_t len, | |
77965c97 | 572 | s32 signal, gfp_t gfp) |
2a519311 JB |
573 | { |
574 | struct cfg80211_internal_bss *res; | |
575 | size_t ielen = len - offsetof(struct ieee80211_mgmt, | |
576 | u.probe_resp.variable); | |
2a519311 JB |
577 | size_t privsz = wiphy->bss_priv_size; |
578 | ||
22fe88d3 | 579 | if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && |
2a519311 JB |
580 | (signal < 0 || signal > 100))) |
581 | return NULL; | |
582 | ||
583 | if (WARN_ON(!mgmt || !wiphy || | |
584 | len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable))) | |
585 | return NULL; | |
586 | ||
587 | res = kzalloc(sizeof(*res) + privsz + ielen, gfp); | |
588 | if (!res) | |
589 | return NULL; | |
590 | ||
591 | memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN); | |
592 | res->pub.channel = channel; | |
2a519311 JB |
593 | res->pub.signal = signal; |
594 | res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); | |
595 | res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); | |
596 | res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); | |
34a6eddb JM |
597 | /* |
598 | * The initial buffer for the IEs is allocated with the BSS entry and | |
599 | * is located after the private area. | |
600 | */ | |
601 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { | |
602 | res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz; | |
603 | memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable, | |
604 | ielen); | |
605 | res->pub.len_proberesp_ies = ielen; | |
606 | res->pub.information_elements = res->pub.proberesp_ies; | |
607 | res->pub.len_information_elements = res->pub.len_proberesp_ies; | |
608 | } else { | |
609 | res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz; | |
610 | memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen); | |
611 | res->pub.len_beacon_ies = ielen; | |
612 | res->pub.information_elements = res->pub.beacon_ies; | |
613 | res->pub.len_information_elements = res->pub.len_beacon_ies; | |
614 | } | |
2a519311 JB |
615 | |
616 | kref_init(&res->ref); | |
617 | ||
34a6eddb | 618 | res = cfg80211_bss_update(wiphy_to_dev(wiphy), res); |
2a519311 JB |
619 | if (!res) |
620 | return NULL; | |
621 | ||
e38f8a7a LR |
622 | if (res->pub.capability & WLAN_CAPABILITY_ESS) |
623 | regulatory_hint_found_beacon(wiphy, channel, gfp); | |
624 | ||
2a519311 JB |
625 | /* cfg80211_bss_update gives us a referenced result */ |
626 | return &res->pub; | |
627 | } | |
628 | EXPORT_SYMBOL(cfg80211_inform_bss_frame); | |
629 | ||
630 | void cfg80211_put_bss(struct cfg80211_bss *pub) | |
631 | { | |
632 | struct cfg80211_internal_bss *bss; | |
633 | ||
634 | if (!pub) | |
635 | return; | |
636 | ||
637 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
638 | kref_put(&bss->ref, bss_release); | |
639 | } | |
640 | EXPORT_SYMBOL(cfg80211_put_bss); | |
641 | ||
d491af19 JB |
642 | void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) |
643 | { | |
644 | struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy); | |
645 | struct cfg80211_internal_bss *bss; | |
646 | ||
647 | if (WARN_ON(!pub)) | |
648 | return; | |
649 | ||
650 | bss = container_of(pub, struct cfg80211_internal_bss, pub); | |
651 | ||
652 | spin_lock_bh(&dev->bss_lock); | |
653 | ||
654 | list_del(&bss->list); | |
f5ea9120 | 655 | dev->bss_generation++; |
d491af19 JB |
656 | rb_erase(&bss->rbn, &dev->bss_tree); |
657 | ||
658 | spin_unlock_bh(&dev->bss_lock); | |
659 | ||
660 | kref_put(&bss->ref, bss_release); | |
661 | } | |
662 | EXPORT_SYMBOL(cfg80211_unlink_bss); | |
663 | ||
3d23e349 | 664 | #ifdef CONFIG_CFG80211_WEXT |
2a519311 JB |
665 | int cfg80211_wext_siwscan(struct net_device *dev, |
666 | struct iw_request_info *info, | |
667 | union iwreq_data *wrqu, char *extra) | |
668 | { | |
669 | struct cfg80211_registered_device *rdev; | |
670 | struct wiphy *wiphy; | |
671 | struct iw_scan_req *wreq = NULL; | |
65486c8b | 672 | struct cfg80211_scan_request *creq = NULL; |
2a519311 JB |
673 | int i, err, n_channels = 0; |
674 | enum ieee80211_band band; | |
675 | ||
676 | if (!netif_running(dev)) | |
677 | return -ENETDOWN; | |
678 | ||
b2e3abdc HS |
679 | if (wrqu->data.length == sizeof(struct iw_scan_req)) |
680 | wreq = (struct iw_scan_req *)extra; | |
681 | ||
463d0183 | 682 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
683 | |
684 | if (IS_ERR(rdev)) | |
685 | return PTR_ERR(rdev); | |
686 | ||
687 | if (rdev->scan_req) { | |
688 | err = -EBUSY; | |
689 | goto out; | |
690 | } | |
691 | ||
692 | wiphy = &rdev->wiphy; | |
693 | ||
b2e3abdc HS |
694 | /* Determine number of channels, needed to allocate creq */ |
695 | if (wreq && wreq->num_channels) | |
696 | n_channels = wreq->num_channels; | |
697 | else { | |
698 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) | |
699 | if (wiphy->bands[band]) | |
700 | n_channels += wiphy->bands[band]->n_channels; | |
701 | } | |
2a519311 JB |
702 | |
703 | creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + | |
704 | n_channels * sizeof(void *), | |
705 | GFP_ATOMIC); | |
706 | if (!creq) { | |
707 | err = -ENOMEM; | |
708 | goto out; | |
709 | } | |
710 | ||
711 | creq->wiphy = wiphy; | |
463d0183 | 712 | creq->dev = dev; |
5ba63533 JB |
713 | /* SSIDs come after channels */ |
714 | creq->ssids = (void *)&creq->channels[n_channels]; | |
2a519311 JB |
715 | creq->n_channels = n_channels; |
716 | creq->n_ssids = 1; | |
717 | ||
b2e3abdc | 718 | /* translate "Scan on frequencies" request */ |
2a519311 JB |
719 | i = 0; |
720 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
721 | int j; | |
584991dc | 722 | |
2a519311 JB |
723 | if (!wiphy->bands[band]) |
724 | continue; | |
584991dc | 725 | |
2a519311 | 726 | for (j = 0; j < wiphy->bands[band]->n_channels; j++) { |
584991dc JB |
727 | /* ignore disabled channels */ |
728 | if (wiphy->bands[band]->channels[j].flags & | |
729 | IEEE80211_CHAN_DISABLED) | |
730 | continue; | |
b2e3abdc HS |
731 | |
732 | /* If we have a wireless request structure and the | |
733 | * wireless request specifies frequencies, then search | |
734 | * for the matching hardware channel. | |
735 | */ | |
736 | if (wreq && wreq->num_channels) { | |
737 | int k; | |
738 | int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; | |
739 | for (k = 0; k < wreq->num_channels; k++) { | |
a4e7b730 | 740 | int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]); |
b2e3abdc HS |
741 | if (wext_freq == wiphy_freq) |
742 | goto wext_freq_found; | |
743 | } | |
744 | goto wext_freq_not_found; | |
745 | } | |
746 | ||
747 | wext_freq_found: | |
2a519311 JB |
748 | creq->channels[i] = &wiphy->bands[band]->channels[j]; |
749 | i++; | |
b2e3abdc | 750 | wext_freq_not_found: ; |
2a519311 JB |
751 | } |
752 | } | |
8862dc5f HS |
753 | /* No channels found? */ |
754 | if (!i) { | |
755 | err = -EINVAL; | |
756 | goto out; | |
757 | } | |
2a519311 | 758 | |
b2e3abdc HS |
759 | /* Set real number of channels specified in creq->channels[] */ |
760 | creq->n_channels = i; | |
2a519311 | 761 | |
b2e3abdc HS |
762 | /* translate "Scan for SSID" request */ |
763 | if (wreq) { | |
2a519311 | 764 | if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { |
65486c8b JB |
765 | if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { |
766 | err = -EINVAL; | |
767 | goto out; | |
768 | } | |
2a519311 JB |
769 | memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); |
770 | creq->ssids[0].ssid_len = wreq->essid_len; | |
771 | } | |
772 | if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) | |
773 | creq->n_ssids = 0; | |
774 | } | |
775 | ||
776 | rdev->scan_req = creq; | |
777 | err = rdev->ops->scan(wiphy, dev, creq); | |
778 | if (err) { | |
779 | rdev->scan_req = NULL; | |
65486c8b | 780 | /* creq will be freed below */ |
463d0183 | 781 | } else { |
a538e2d5 | 782 | nl80211_send_scan_start(rdev, dev); |
65486c8b JB |
783 | /* creq now owned by driver */ |
784 | creq = NULL; | |
463d0183 JB |
785 | dev_hold(dev); |
786 | } | |
2a519311 | 787 | out: |
65486c8b | 788 | kfree(creq); |
4d0c8aea | 789 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
790 | return err; |
791 | } | |
ba44cb72 | 792 | EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan); |
2a519311 JB |
793 | |
794 | static void ieee80211_scan_add_ies(struct iw_request_info *info, | |
795 | struct cfg80211_bss *bss, | |
796 | char **current_ev, char *end_buf) | |
797 | { | |
798 | u8 *pos, *end, *next; | |
799 | struct iw_event iwe; | |
800 | ||
801 | if (!bss->information_elements || | |
802 | !bss->len_information_elements) | |
803 | return; | |
804 | ||
805 | /* | |
806 | * If needed, fragment the IEs buffer (at IE boundaries) into short | |
807 | * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. | |
808 | */ | |
809 | pos = bss->information_elements; | |
810 | end = pos + bss->len_information_elements; | |
811 | ||
812 | while (end - pos > IW_GENERIC_IE_MAX) { | |
813 | next = pos + 2 + pos[1]; | |
814 | while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) | |
815 | next = next + 2 + next[1]; | |
816 | ||
817 | memset(&iwe, 0, sizeof(iwe)); | |
818 | iwe.cmd = IWEVGENIE; | |
819 | iwe.u.data.length = next - pos; | |
820 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
821 | end_buf, &iwe, pos); | |
822 | ||
823 | pos = next; | |
824 | } | |
825 | ||
826 | if (end > pos) { | |
827 | memset(&iwe, 0, sizeof(iwe)); | |
828 | iwe.cmd = IWEVGENIE; | |
829 | iwe.u.data.length = end - pos; | |
830 | *current_ev = iwe_stream_add_point(info, *current_ev, | |
831 | end_buf, &iwe, pos); | |
832 | } | |
833 | } | |
834 | ||
cb3a8eec DW |
835 | static inline unsigned int elapsed_jiffies_msecs(unsigned long start) |
836 | { | |
837 | unsigned long end = jiffies; | |
838 | ||
839 | if (end >= start) | |
840 | return jiffies_to_msecs(end - start); | |
841 | ||
842 | return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1); | |
843 | } | |
2a519311 JB |
844 | |
845 | static char * | |
77965c97 JB |
846 | ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, |
847 | struct cfg80211_internal_bss *bss, char *current_ev, | |
848 | char *end_buf) | |
2a519311 JB |
849 | { |
850 | struct iw_event iwe; | |
851 | u8 *buf, *cfg, *p; | |
852 | u8 *ie = bss->pub.information_elements; | |
a77b8552 | 853 | int rem = bss->pub.len_information_elements, i, sig; |
2a519311 JB |
854 | bool ismesh = false; |
855 | ||
856 | memset(&iwe, 0, sizeof(iwe)); | |
857 | iwe.cmd = SIOCGIWAP; | |
858 | iwe.u.ap_addr.sa_family = ARPHRD_ETHER; | |
859 | memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); | |
860 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
861 | IW_EV_ADDR_LEN); | |
862 | ||
863 | memset(&iwe, 0, sizeof(iwe)); | |
864 | iwe.cmd = SIOCGIWFREQ; | |
865 | iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); | |
866 | iwe.u.freq.e = 0; | |
867 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
868 | IW_EV_FREQ_LEN); | |
869 | ||
870 | memset(&iwe, 0, sizeof(iwe)); | |
871 | iwe.cmd = SIOCGIWFREQ; | |
872 | iwe.u.freq.m = bss->pub.channel->center_freq; | |
873 | iwe.u.freq.e = 6; | |
874 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe, | |
875 | IW_EV_FREQ_LEN); | |
876 | ||
77965c97 | 877 | if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { |
2a519311 JB |
878 | memset(&iwe, 0, sizeof(iwe)); |
879 | iwe.cmd = IWEVQUAL; | |
880 | iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | | |
881 | IW_QUAL_NOISE_INVALID | | |
a77b8552 | 882 | IW_QUAL_QUAL_UPDATED; |
77965c97 | 883 | switch (wiphy->signal_type) { |
2a519311 | 884 | case CFG80211_SIGNAL_TYPE_MBM: |
a77b8552 JB |
885 | sig = bss->pub.signal / 100; |
886 | iwe.u.qual.level = sig; | |
2a519311 | 887 | iwe.u.qual.updated |= IW_QUAL_DBM; |
a77b8552 JB |
888 | if (sig < -110) /* rather bad */ |
889 | sig = -110; | |
890 | else if (sig > -40) /* perfect */ | |
891 | sig = -40; | |
892 | /* will give a range of 0 .. 70 */ | |
893 | iwe.u.qual.qual = sig + 110; | |
2a519311 JB |
894 | break; |
895 | case CFG80211_SIGNAL_TYPE_UNSPEC: | |
896 | iwe.u.qual.level = bss->pub.signal; | |
a77b8552 JB |
897 | /* will give range 0 .. 100 */ |
898 | iwe.u.qual.qual = bss->pub.signal; | |
2a519311 JB |
899 | break; |
900 | default: | |
901 | /* not reached */ | |
902 | break; | |
903 | } | |
904 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
905 | &iwe, IW_EV_QUAL_LEN); | |
906 | } | |
907 | ||
908 | memset(&iwe, 0, sizeof(iwe)); | |
909 | iwe.cmd = SIOCGIWENCODE; | |
910 | if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) | |
911 | iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; | |
912 | else | |
913 | iwe.u.data.flags = IW_ENCODE_DISABLED; | |
914 | iwe.u.data.length = 0; | |
915 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
916 | &iwe, ""); | |
917 | ||
918 | while (rem >= 2) { | |
919 | /* invalid data */ | |
920 | if (ie[1] > rem - 2) | |
921 | break; | |
922 | ||
923 | switch (ie[0]) { | |
924 | case WLAN_EID_SSID: | |
925 | memset(&iwe, 0, sizeof(iwe)); | |
926 | iwe.cmd = SIOCGIWESSID; | |
927 | iwe.u.data.length = ie[1]; | |
928 | iwe.u.data.flags = 1; | |
929 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
930 | &iwe, ie + 2); | |
931 | break; | |
932 | case WLAN_EID_MESH_ID: | |
933 | memset(&iwe, 0, sizeof(iwe)); | |
934 | iwe.cmd = SIOCGIWESSID; | |
935 | iwe.u.data.length = ie[1]; | |
936 | iwe.u.data.flags = 1; | |
937 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
938 | &iwe, ie + 2); | |
939 | break; | |
940 | case WLAN_EID_MESH_CONFIG: | |
941 | ismesh = true; | |
136cfa28 | 942 | if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) |
2a519311 JB |
943 | break; |
944 | buf = kmalloc(50, GFP_ATOMIC); | |
945 | if (!buf) | |
946 | break; | |
947 | cfg = ie + 2; | |
948 | memset(&iwe, 0, sizeof(iwe)); | |
949 | iwe.cmd = IWEVCUSTOM; | |
76aa5e70 RP |
950 | sprintf(buf, "Mesh Network Path Selection Protocol ID: " |
951 | "0x%02X", cfg[0]); | |
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, "Path Selection Metric ID: 0x%02X", |
957 | cfg[1]); | |
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 RP |
962 | sprintf(buf, "Congestion Control Mode ID: 0x%02X", |
963 | cfg[2]); | |
2a519311 JB |
964 | iwe.u.data.length = strlen(buf); |
965 | current_ev = iwe_stream_add_point(info, current_ev, | |
966 | end_buf, | |
967 | &iwe, buf); | |
76aa5e70 | 968 | sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]); |
2a519311 JB |
969 | iwe.u.data.length = strlen(buf); |
970 | current_ev = iwe_stream_add_point(info, current_ev, | |
971 | end_buf, | |
972 | &iwe, buf); | |
76aa5e70 RP |
973 | sprintf(buf, "Authentication ID: 0x%02X", cfg[4]); |
974 | iwe.u.data.length = strlen(buf); | |
975 | current_ev = iwe_stream_add_point(info, current_ev, | |
976 | end_buf, | |
977 | &iwe, buf); | |
978 | sprintf(buf, "Formation Info: 0x%02X", cfg[5]); | |
979 | iwe.u.data.length = strlen(buf); | |
980 | current_ev = iwe_stream_add_point(info, current_ev, | |
981 | end_buf, | |
982 | &iwe, buf); | |
983 | sprintf(buf, "Capabilities: 0x%02X", cfg[6]); | |
2a519311 JB |
984 | iwe.u.data.length = strlen(buf); |
985 | current_ev = iwe_stream_add_point(info, current_ev, | |
986 | end_buf, | |
987 | &iwe, buf); | |
988 | kfree(buf); | |
989 | break; | |
990 | case WLAN_EID_SUPP_RATES: | |
991 | case WLAN_EID_EXT_SUPP_RATES: | |
992 | /* display all supported rates in readable format */ | |
993 | p = current_ev + iwe_stream_lcp_len(info); | |
994 | ||
995 | memset(&iwe, 0, sizeof(iwe)); | |
996 | iwe.cmd = SIOCGIWRATE; | |
997 | /* Those two flags are ignored... */ | |
998 | iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; | |
999 | ||
1000 | for (i = 0; i < ie[1]; i++) { | |
1001 | iwe.u.bitrate.value = | |
1002 | ((ie[i + 2] & 0x7f) * 500000); | |
1003 | p = iwe_stream_add_value(info, current_ev, p, | |
1004 | end_buf, &iwe, IW_EV_PARAM_LEN); | |
1005 | } | |
1006 | current_ev = p; | |
1007 | break; | |
1008 | } | |
1009 | rem -= ie[1] + 2; | |
1010 | ie += ie[1] + 2; | |
1011 | } | |
1012 | ||
f64f9e71 JP |
1013 | if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || |
1014 | ismesh) { | |
2a519311 JB |
1015 | memset(&iwe, 0, sizeof(iwe)); |
1016 | iwe.cmd = SIOCGIWMODE; | |
1017 | if (ismesh) | |
1018 | iwe.u.mode = IW_MODE_MESH; | |
1019 | else if (bss->pub.capability & WLAN_CAPABILITY_ESS) | |
1020 | iwe.u.mode = IW_MODE_MASTER; | |
1021 | else | |
1022 | iwe.u.mode = IW_MODE_ADHOC; | |
1023 | current_ev = iwe_stream_add_event(info, current_ev, end_buf, | |
1024 | &iwe, IW_EV_UINT_LEN); | |
1025 | } | |
1026 | ||
1027 | buf = kmalloc(30, GFP_ATOMIC); | |
1028 | if (buf) { | |
1029 | memset(&iwe, 0, sizeof(iwe)); | |
1030 | iwe.cmd = IWEVCUSTOM; | |
1031 | sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf)); | |
1032 | iwe.u.data.length = strlen(buf); | |
1033 | current_ev = iwe_stream_add_point(info, current_ev, end_buf, | |
1034 | &iwe, buf); | |
1035 | memset(&iwe, 0, sizeof(iwe)); | |
1036 | iwe.cmd = IWEVCUSTOM; | |
cb3a8eec DW |
1037 | sprintf(buf, " Last beacon: %ums ago", |
1038 | elapsed_jiffies_msecs(bss->ts)); | |
2a519311 JB |
1039 | iwe.u.data.length = strlen(buf); |
1040 | current_ev = iwe_stream_add_point(info, current_ev, | |
1041 | end_buf, &iwe, buf); | |
1042 | kfree(buf); | |
1043 | } | |
1044 | ||
1045 | ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf); | |
1046 | ||
1047 | return current_ev; | |
1048 | } | |
1049 | ||
1050 | ||
1051 | static int ieee80211_scan_results(struct cfg80211_registered_device *dev, | |
1052 | struct iw_request_info *info, | |
1053 | char *buf, size_t len) | |
1054 | { | |
1055 | char *current_ev = buf; | |
1056 | char *end_buf = buf + len; | |
1057 | struct cfg80211_internal_bss *bss; | |
1058 | ||
1059 | spin_lock_bh(&dev->bss_lock); | |
1060 | cfg80211_bss_expire(dev); | |
1061 | ||
1062 | list_for_each_entry(bss, &dev->bss_list, list) { | |
1063 | if (buf + len - current_ev <= IW_EV_ADDR_LEN) { | |
1064 | spin_unlock_bh(&dev->bss_lock); | |
1065 | return -E2BIG; | |
1066 | } | |
77965c97 JB |
1067 | current_ev = ieee80211_bss(&dev->wiphy, info, bss, |
1068 | current_ev, end_buf); | |
2a519311 JB |
1069 | } |
1070 | spin_unlock_bh(&dev->bss_lock); | |
1071 | return current_ev - buf; | |
1072 | } | |
1073 | ||
1074 | ||
1075 | int cfg80211_wext_giwscan(struct net_device *dev, | |
1076 | struct iw_request_info *info, | |
1077 | struct iw_point *data, char *extra) | |
1078 | { | |
1079 | struct cfg80211_registered_device *rdev; | |
1080 | int res; | |
1081 | ||
1082 | if (!netif_running(dev)) | |
1083 | return -ENETDOWN; | |
1084 | ||
463d0183 | 1085 | rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); |
2a519311 JB |
1086 | |
1087 | if (IS_ERR(rdev)) | |
1088 | return PTR_ERR(rdev); | |
1089 | ||
1090 | if (rdev->scan_req) { | |
1091 | res = -EAGAIN; | |
1092 | goto out; | |
1093 | } | |
1094 | ||
1095 | res = ieee80211_scan_results(rdev, info, extra, data->length); | |
1096 | data->length = 0; | |
1097 | if (res >= 0) { | |
1098 | data->length = res; | |
1099 | res = 0; | |
1100 | } | |
1101 | ||
1102 | out: | |
4d0c8aea | 1103 | cfg80211_unlock_rdev(rdev); |
2a519311 JB |
1104 | return res; |
1105 | } | |
ba44cb72 | 1106 | EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan); |
2a519311 | 1107 | #endif |